Replace io_uring sendmsg/recvmsg with synchronous sendmsg/recvmsg

.dockerignore

@@ -1,19 +0,0 @@
-.git
-build
-packages
-mon/node_modules
-*.o
-*.so
-osd
-stub_osd
-stub_uring_osd
-stub_bench
-osd_test
-dump_journal
-nbd_proxy
-rm_inode
-fio
-qemu
-rpm/*.Dockerfile
-debian/*.Dockerfile
-Dockerfile

.gitignore

@@ -1,18 +0,0 @@
-*.o
-*.so
-package-lock.json
-fio
-qemu
-osd
-stub_osd
-stub_uring_osd
-stub_bench
-osd_test
-osd_peering_pg_test
-dump_journal
-nbd_proxy
-rm_inode
-test_allocator
-test_blockstore
-test_shit
-osd_rmw_test

.gitmodules

@@ -1,6 +0,0 @@
-[submodule "cpp-btree"]
-	path = cpp-btree
-	url = ../cpp-btree.git
-[submodule "json11"]
-	path = json11
-	url = ../json11.git

CMakeLists.txt

@@ -1,7 +0,0 @@
-cmake_minimum_required(VERSION 2.8)
-
-project(vitastor)
-
-set(VERSION "0.6.5")
-
-add_subdirectory(src)

GPL-2.0.txt

@@ -1,339 +0,0 @@
-                    GNU GENERAL PUBLIC LICENSE
-                       Version 2, June 1991
-
- Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
- 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- Everyone is permitted to copy and distribute verbatim copies
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-
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-  The licenses for most software are designed to take away your
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-License is intended to guarantee your freedom to share and change free
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-General Public License applies to most of the Free Software
-Foundation's software and to any other program whose authors commit to
-using it.  (Some other Free Software Foundation software is covered by
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LICENSE

@@ -1,27 +0,0 @@
-Copyright (c) Vitaliy Filippov (vitalif [at] yourcmc.ru), 2019+
-
-All server-side code (OSD, Monitor and so on) is licensed under the terms of
-Vitastor Network Public License 1.1 (VNPL 1.1), a copyleft license based on
-GNU GPLv3.0 with the additional "Network Interaction" clause which requires
-opensourcing all programs directly or indirectly interacting with Vitastor
-through a computer network and expressly designed to be used in conjunction
-with it ("Proxy Programs"). Proxy Programs may be made public not only under
-the terms of the same license, but also under the terms of any GPL-Compatible
-Free Software License, as listed by the Free Software Foundation.
-This is a stricter copyleft license than the Affero GPL.
-
-Please note that VNPL doesn't require you to open the code of proprietary
-software running inside a VM if it's not specially designed to be used with
-Vitastor.
-
-Basically, you can't use the software in a proprietary environment to provide
-its functionality to users without opensourcing all intermediary components
-standing between the user and Vitastor or purchasing a commercial license
-from the author 😀.
-
-Client libraries (cluster_client and so on) are dual-licensed under the same
-VNPL 1.1 and also GNU GPL 2.0 or later to allow for compatibility with GPLed
-software like QEMU and fio.
-
-You can find the full text of VNPL-1.1 in the file [VNPL-1.1.txt](VNPL-1.1.txt).
-GPL 2.0 is also included in this repository as [GPL-2.0.txt](GPL-2.0.txt).

Make-gen.pl

@@ -0,0 +1,46 @@
+#!/usr/bin/perl
+
+use strict;
+
+my $deps = {};
+for my $line (split /\n/, `grep '^#include "' *.cpp *.h`)
+{
+    if ($line =~ /^([^:]+):\#include "([^"]+)"/s)
+    {
+        $deps->{$1}->{$2} = 1;
+    }
+}
+
+my $added;
+do
+{
+    $added = 0;
+    for my $file (keys %$deps)
+    {
+        for my $dep (keys %{$deps->{$file}})
+        {
+            if ($deps->{$dep})
+            {
+                for my $subdep (keys %{$deps->{$dep}})
+                {
+                    if (!$deps->{$file}->{$subdep})
+                    {
+                        $added = 1;
+                        $deps->{$file}->{$subdep} = 1;
+                    }
+                }
+            }
+        }
+    }
+} while ($added);
+
+for my $file (sort keys %$deps)
+{
+    if ($file =~ /\.cpp$/)
+    {
+        my $obj = $file;
+        $obj =~ s/\.cpp$/.o/s;
+        print "$obj: $file ".join(" ", sort keys %{$deps->{$file}})."\n";
+        print "\tg++ \$(CXXFLAGS) -c -o \$\@ \$\<\n";
+    }
+}

Makefile

@@ -0,0 +1,153 @@
+BLOCKSTORE_OBJS := allocator.o blockstore.o blockstore_impl.o blockstore_init.o blockstore_open.o blockstore_journal.o blockstore_read.o \
+	blockstore_write.o blockstore_sync.o blockstore_stable.o blockstore_rollback.o blockstore_flush.o crc32c.o ringloop.o
+# -fsanitize=address
+CXXFLAGS := -g -O3 -Wall -Wno-sign-compare -Wno-comment -Wno-parentheses -Wno-pointer-arith -fPIC -fdiagnostics-color=always
+all: libfio_blockstore.so osd libfio_sec_osd.so libfio_cluster.so stub_osd stub_uring_osd stub_bench osd_test dump_journal
+clean:
+	rm -f *.o
+
+dump_journal: dump_journal.cpp crc32c.o blockstore_journal.h
+	g++ $(CXXFLAGS) -o $@ $< crc32c.o
+
+libblockstore.so: $(BLOCKSTORE_OBJS)
+	g++ $(CXXFLAGS) -o $@ -shared $(BLOCKSTORE_OBJS) -ltcmalloc_minimal -luring
+libfio_blockstore.so: ./libblockstore.so fio_engine.o json11.o
+	g++ $(CXXFLAGS) -shared -o $@ fio_engine.o json11.o ./libblockstore.so -ltcmalloc_minimal -luring
+
+OSD_OBJS := osd.o osd_secondary.o msgr_receive.o msgr_send.o osd_peering.o osd_flush.o osd_peering_pg.o \
+	osd_primary.o osd_primary_subops.o etcd_state_client.o messenger.o osd_cluster.o http_client.o pg_states.o \
+	osd_rmw.o json11.o base64.o timerfd_manager.o
+osd: ./libblockstore.so osd_main.cpp osd.h osd_ops.h $(OSD_OBJS)
+	g++ $(CXXFLAGS) -o $@ osd_main.cpp $(OSD_OBJS) ./libblockstore.so -ltcmalloc_minimal -luring
+
+stub_osd: stub_osd.o rw_blocking.o
+	g++ $(CXXFLAGS) -o $@ stub_osd.o rw_blocking.o -ltcmalloc_minimal
+
+STUB_URING_OSD_OBJS := stub_uring_osd.o epoll_manager.o messenger.o msgr_send.o msgr_receive.o ringloop.o timerfd_manager.o json11.o
+stub_uring_osd: $(STUB_URING_OSD_OBJS)
+	g++ $(CXXFLAGS) -o $@ -ltcmalloc_minimal $(STUB_URING_OSD_OBJS) -luring
+stub_bench: stub_bench.cpp osd_ops.h rw_blocking.o
+	g++ $(CXXFLAGS) -o $@ stub_bench.cpp rw_blocking.o -ltcmalloc_minimal
+osd_test: osd_test.cpp osd_ops.h rw_blocking.o
+	g++ $(CXXFLAGS) -o $@ osd_test.cpp rw_blocking.o -ltcmalloc_minimal
+osd_peering_pg_test: osd_peering_pg_test.cpp osd_peering_pg.o
+	g++ $(CXXFLAGS) -o $@ $< osd_peering_pg.o -ltcmalloc_minimal
+
+libfio_sec_osd.so: fio_sec_osd.o rw_blocking.o
+	g++ $(CXXFLAGS) -ltcmalloc_minimal -shared -o $@ fio_sec_osd.o rw_blocking.o
+
+FIO_CLUSTER_OBJS := fio_cluster.o cluster_client.o epoll_manager.o etcd_state_client.o \
+	messenger.o msgr_send.o msgr_receive.o ringloop.o json11.o http_client.o pg_states.o timerfd_manager.o base64.o
+libfio_cluster.so: $(FIO_CLUSTER_OBJS)
+	g++ $(CXXFLAGS) -ltcmalloc_minimal -shared -o $@ $(FIO_CLUSTER_OBJS) -luring
+
+test_blockstore: ./libblockstore.so test_blockstore.cpp timerfd_interval.o
+	g++ $(CXXFLAGS) -o test_blockstore test_blockstore.cpp timerfd_interval.o ./libblockstore.so -ltcmalloc_minimal -luring
+test: test.cpp osd_peering_pg.o
+	g++ $(CXXFLAGS) -o test test.cpp osd_peering_pg.o -luring -lm
+test_allocator: test_allocator.cpp allocator.o
+	g++ $(CXXFLAGS) -o test_allocator test_allocator.cpp allocator.o
+
+crc32c.o: crc32c.c crc32c.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+json11.o: json11/json11.cpp
+	g++ $(CXXFLAGS) -c -o json11.o json11/json11.cpp
+
+# Autogenerated
+
+allocator.o: allocator.cpp allocator.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+base64.o: base64.cpp base64.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+blockstore.o: blockstore.cpp allocator.h blockstore.h blockstore_flush.h blockstore_impl.h blockstore_init.h blockstore_journal.h cpp-btree/btree_map.h crc32c.h object_id.h ringloop.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+blockstore_flush.o: blockstore_flush.cpp allocator.h blockstore.h blockstore_flush.h blockstore_impl.h blockstore_init.h blockstore_journal.h cpp-btree/btree_map.h crc32c.h object_id.h ringloop.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+blockstore_impl.o: blockstore_impl.cpp allocator.h blockstore.h blockstore_flush.h blockstore_impl.h blockstore_init.h blockstore_journal.h cpp-btree/btree_map.h crc32c.h object_id.h ringloop.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+blockstore_init.o: blockstore_init.cpp allocator.h blockstore.h blockstore_flush.h blockstore_impl.h blockstore_init.h blockstore_journal.h cpp-btree/btree_map.h crc32c.h object_id.h ringloop.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+blockstore_journal.o: blockstore_journal.cpp allocator.h blockstore.h blockstore_flush.h blockstore_impl.h blockstore_init.h blockstore_journal.h cpp-btree/btree_map.h crc32c.h object_id.h ringloop.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+blockstore_open.o: blockstore_open.cpp allocator.h blockstore.h blockstore_flush.h blockstore_impl.h blockstore_init.h blockstore_journal.h cpp-btree/btree_map.h crc32c.h object_id.h ringloop.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+blockstore_read.o: blockstore_read.cpp allocator.h blockstore.h blockstore_flush.h blockstore_impl.h blockstore_init.h blockstore_journal.h cpp-btree/btree_map.h crc32c.h object_id.h ringloop.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+blockstore_rollback.o: blockstore_rollback.cpp allocator.h blockstore.h blockstore_flush.h blockstore_impl.h blockstore_init.h blockstore_journal.h cpp-btree/btree_map.h crc32c.h object_id.h ringloop.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+blockstore_stable.o: blockstore_stable.cpp allocator.h blockstore.h blockstore_flush.h blockstore_impl.h blockstore_init.h blockstore_journal.h cpp-btree/btree_map.h crc32c.h object_id.h ringloop.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+blockstore_sync.o: blockstore_sync.cpp allocator.h blockstore.h blockstore_flush.h blockstore_impl.h blockstore_init.h blockstore_journal.h cpp-btree/btree_map.h crc32c.h object_id.h ringloop.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+blockstore_write.o: blockstore_write.cpp allocator.h blockstore.h blockstore_flush.h blockstore_impl.h blockstore_init.h blockstore_journal.h cpp-btree/btree_map.h crc32c.h object_id.h ringloop.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+cluster_client.o: cluster_client.cpp cluster_client.h etcd_state_client.h http_client.h json11/json11.hpp messenger.h object_id.h osd_id.h osd_ops.h ringloop.h timerfd_manager.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+dump_journal.o: dump_journal.cpp allocator.h blockstore.h blockstore_flush.h blockstore_impl.h blockstore_init.h blockstore_journal.h cpp-btree/btree_map.h crc32c.h object_id.h ringloop.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+epoll_manager.o: epoll_manager.cpp epoll_manager.h ringloop.h timerfd_manager.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+etcd_state_client.o: etcd_state_client.cpp base64.h etcd_state_client.h http_client.h json11/json11.hpp object_id.h osd_id.h osd_ops.h pg_states.h timerfd_manager.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+fio_cluster.o: fio_cluster.cpp cluster_client.h epoll_manager.h etcd_state_client.h fio/fio.h fio/optgroup.h http_client.h json11/json11.hpp messenger.h object_id.h osd_id.h osd_ops.h ringloop.h timerfd_manager.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+fio_engine.o: fio_engine.cpp blockstore.h fio/fio.h fio/optgroup.h json11/json11.hpp object_id.h ringloop.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+fio_sec_osd.o: fio_sec_osd.cpp fio/fio.h fio/optgroup.h object_id.h osd_id.h osd_ops.h rw_blocking.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+http_client.o: http_client.cpp http_client.h json11/json11.hpp timerfd_manager.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+messenger.o: messenger.cpp json11/json11.hpp messenger.h object_id.h osd_id.h osd_ops.h ringloop.h timerfd_manager.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+msgr_receive.o: msgr_receive.cpp json11/json11.hpp messenger.h object_id.h osd_id.h osd_ops.h ringloop.h timerfd_manager.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+msgr_send.o: msgr_send.cpp json11/json11.hpp messenger.h object_id.h osd_id.h osd_ops.h ringloop.h timerfd_manager.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+osd.o: osd.cpp blockstore.h cpp-btree/btree_map.h etcd_state_client.h http_client.h json11/json11.hpp messenger.h object_id.h osd.h osd_id.h osd_ops.h osd_peering_pg.h pg_states.h ringloop.h timerfd_manager.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+osd_cluster.o: osd_cluster.cpp base64.h blockstore.h cpp-btree/btree_map.h etcd_state_client.h http_client.h json11/json11.hpp messenger.h object_id.h osd.h osd_id.h osd_ops.h osd_peering_pg.h pg_states.h ringloop.h timerfd_manager.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+osd_flush.o: osd_flush.cpp blockstore.h cpp-btree/btree_map.h etcd_state_client.h http_client.h json11/json11.hpp messenger.h object_id.h osd.h osd_id.h osd_ops.h osd_peering_pg.h pg_states.h ringloop.h timerfd_manager.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+osd_main.o: osd_main.cpp blockstore.h cpp-btree/btree_map.h etcd_state_client.h http_client.h json11/json11.hpp messenger.h object_id.h osd.h osd_id.h osd_ops.h osd_peering_pg.h pg_states.h ringloop.h timerfd_manager.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+osd_peering.o: osd_peering.cpp base64.h blockstore.h cpp-btree/btree_map.h etcd_state_client.h http_client.h json11/json11.hpp messenger.h object_id.h osd.h osd_id.h osd_ops.h osd_peering_pg.h pg_states.h ringloop.h timerfd_manager.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+osd_peering_pg.o: osd_peering_pg.cpp cpp-btree/btree_map.h object_id.h osd_id.h osd_ops.h osd_peering_pg.h pg_states.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+osd_peering_pg_test.o: osd_peering_pg_test.cpp cpp-btree/btree_map.h object_id.h osd_id.h osd_ops.h osd_peering_pg.h pg_states.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+osd_primary.o: osd_primary.cpp blockstore.h cpp-btree/btree_map.h etcd_state_client.h http_client.h json11/json11.hpp messenger.h object_id.h osd.h osd_id.h osd_ops.h osd_peering_pg.h osd_primary.h osd_rmw.h pg_states.h ringloop.h timerfd_manager.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+osd_primary_subops.o: osd_primary_subops.cpp blockstore.h cpp-btree/btree_map.h etcd_state_client.h http_client.h json11/json11.hpp messenger.h object_id.h osd.h osd_id.h osd_ops.h osd_peering_pg.h osd_primary.h osd_rmw.h pg_states.h ringloop.h timerfd_manager.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+osd_rmw.o: osd_rmw.cpp object_id.h osd_id.h osd_rmw.h xor.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+osd_rmw_test.o: osd_rmw_test.cpp object_id.h osd_id.h osd_rmw.cpp osd_rmw.h test_pattern.h xor.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+osd_secondary.o: osd_secondary.cpp blockstore.h cpp-btree/btree_map.h etcd_state_client.h http_client.h json11/json11.hpp messenger.h object_id.h osd.h osd_id.h osd_ops.h osd_peering_pg.h pg_states.h ringloop.h timerfd_manager.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+osd_test.o: osd_test.cpp object_id.h osd_id.h osd_ops.h rw_blocking.h test_pattern.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+pg_states.o: pg_states.cpp pg_states.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+ringloop.o: ringloop.cpp ringloop.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+rw_blocking.o: rw_blocking.cpp rw_blocking.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+stub_bench.o: stub_bench.cpp object_id.h osd_id.h osd_ops.h rw_blocking.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+stub_osd.o: stub_osd.cpp object_id.h osd_id.h osd_ops.h rw_blocking.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+stub_uring_osd.o: stub_uring_osd.cpp epoll_manager.h json11/json11.hpp messenger.h object_id.h osd_id.h osd_ops.h ringloop.h timerfd_manager.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+test.o: test.cpp allocator.h blockstore.h blockstore_flush.h blockstore_impl.h blockstore_init.h blockstore_journal.h cpp-btree/btree_map.h crc32c.h object_id.h osd_id.h osd_ops.h osd_peering_pg.h pg_states.h ringloop.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+test_allocator.o: test_allocator.cpp allocator.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+test_blockstore.o: test_blockstore.cpp blockstore.h object_id.h ringloop.h timerfd_interval.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+timerfd_interval.o: timerfd_interval.cpp ringloop.h timerfd_interval.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+timerfd_manager.o: timerfd_manager.cpp timerfd_manager.h
+	g++ $(CXXFLAGS) -c -o $@ $<

README-ru.md

@@ -1,579 +0,0 @@
-## Vitastor
-
-[Read English version](README.md)
-
-## Идея
-
-Я всего лишь хочу сделать качественную блочную SDS!
-
-Vitastor - распределённая блочная SDS, прямой аналог Ceph RBD и внутренних СХД популярных
-облачных провайдеров. Однако, в отличие от них, Vitastor быстрый и при этом простой.
-Только пока маленький :-).
-
-Архитектурная схожесть с Ceph означает заложенную на уровне алгоритмов записи строгую консистентность,
-репликацию через первичный OSD, симметричную кластеризацию без единой точки отказа
-и автоматическое распределение данных по любому числу дисков любого размера с настраиваемыми схемами
-избыточности - репликацией или с произвольными кодами коррекции ошибок.
-
-## Возможности
-
-Vitastor на данный момент находится в статусе предварительного выпуска, расширенные
-возможности пока отсутствуют, а в будущих версиях вероятны "ломающие" изменения.
-
-Однако следующее уже реализовано:
-
-- Базовая часть - надёжное кластерное блочное хранилище без единой точки отказа
-- Производительность ;-D
-- Несколько схем отказоустойчивости: репликация, XOR n+1 (1 диск чётности), коды коррекции ошибок
-  Рида-Соломона на основе библиотеки jerasure с любым числом дисков данных и чётности в группе
-- Конфигурация через простые человекочитаемые JSON-структуры в etcd
-- Автоматическое распределение данных по OSD, с поддержкой:
-  - Математической оптимизации для лучшей равномерности распределения и минимизации перемещений данных
-  - Нескольких пулов с разными схемами избыточности
-  - Дерева распределения, выбора OSD по тегам / классам устройств (только SSD, только HDD) и по поддереву
-  - Настраиваемых доменов отказа (диск/сервер/стойка и т.п.)
-- Восстановление деградированных блоков
-- Ребаланс, то есть перемещение данных между OSD (дисками)
-- Поддержка "ленивого" fsync (fsync не на каждую операцию)
-- Сбор статистики ввода/вывода в etcd
-- Клиентская библиотека режима пользователя для ввода/вывода
-- Драйвер диска для QEMU (собирается вне дерева исходников QEMU)
-- Драйвер диска для утилиты тестирования производительности fio (также собирается вне дерева исходников fio)
-- NBD-прокси для монтирования образов ядром ("блочное устройство в режиме пользователя")
-- Утилита удаления образов/инодов (vitastor-rm)
-- Пакеты для Debian и CentOS
-- Статистика операций ввода/вывода и занятого места в разрезе инодов
-- Именование инодов через хранение их метаданных в etcd
-- Снапшоты и copy-on-write клоны
-- Сглаживание производительности случайной записи в SSD+HDD конфигурациях
-- Поддержка RDMA/RoCEv2 через libibverbs
-- CSI-плагин для Kubernetes
-- Базовая поддержка OpenStack: драйвер Cinder, патчи для Nova и libvirt
-
-## Планы развития
-
-- Поддержка удаления снапшотов (слияния слоёв)
-- Более корректные скрипты разметки дисков и автоматического запуска OSD
-- Другие инструменты администрирования
-- Плагины для OpenNebula, Proxmox и других облачных систем
-- iSCSI-прокси
-- Более быстрое переключение при отказах
-- Фоновая проверка целостности без контрольных сумм (сверка реплик)
-- Контрольные суммы
-- Поддержка SSD-кэширования (tiered storage)
-- Поддержка NVDIMM
-- Web-интерфейс
-- Возможно, сжатие
-- Возможно, поддержка кэширования данных через системный page cache
-
-## Архитектура
-
-Так же, как и в Ceph, в Vitastor:
-
-- Есть пулы (pools), PG, OSD, мониторы, домены отказа, дерево распределения (аналог crush-дерева).
-- Образы делятся на блоки фиксированного размера (объекты), и эти объекты распределяются по OSD.
-- У OSD есть журнал и метаданные и они тоже могут размещаться на отдельных быстрых дисках.
-- Все операции записи тоже транзакционны. В Vitastor, правда, есть режим отложенного/ленивого fsync
-  (коммита), в котором fsync не вызывается на каждую операцию записи, что делает его более
-  пригодным для использования на "плохих" (десктопных) SSD. Однако все операции записи
-  в любом случае атомарны.
-- Клиентская библиотека тоже старается ждать восстановления после любого отказа кластера, то есть,
-  вы тоже можете перезагрузить хоть весь кластер разом, и клиенты только на время зависнут,
-  но не отключатся.
-
-Некоторые базовые термины для тех, кто не знаком с Ceph:
-
-- OSD (Object Storage Daemon) - процесс, который хранит данные на одном диске и обрабатывает
-  запросы чтения/записи от клиентов.
-- Пул (Pool) - контейнер для данных, имеющих одну и ту же схему избыточности и правила распределения по OSD.
-- PG (Placement Group) - группа объектов, хранимых на одном и том же наборе реплик (OSD).
-  Несколько PG могут храниться на одном и том же наборе реплик, но объекты одной PG
-  в норме не хранятся на разных наборах OSD.
-- Монитор - демон, хранящий состояние кластера.
-- Домен отказа (Failure Domain) - группа OSD, которым вы разрешаете "упасть" всем вместе.
-  Иными словами, это группа OSD, в которые СХД не помещает разные копии одного и того же
-  блока данных. Например, если домен отказа - сервер, то на двух дисках одного сервера
-  никогда не окажется 2 и более копий одного и того же блока данных, а значит, даже
-  если в этом сервере откажут все диски, это будет равносильно потере только 1 копии
-  любого блока данных.
-- Дерево распределения (Placement Tree / CRUSH Tree) - иерархическая группировка OSD
-  в узлы, которые далее можно использовать как домены отказа. То есть, диск (OSD) входит в
-  сервер, сервер входит в стойку, стойка входит в ряд, ряд в датацентр и т.п.
-
-Чем Vitastor отличается от Ceph:
-
-- Vitastor в первую очередь сфокусирован на SSD. Также Vitastor, вероятно, должен неплохо работать
-  с комбинацией SSD и HDD через bcache, а в будущем, возможно, будут добавлены и нативные способы
-  оптимизации под SSD+HDD. Однако хранилище на основе одних лишь жёстких дисков, вообще без SSD,
-  не в приоритете, поэтому оптимизации под этот кейс могут вообще не состояться.
-- OSD Vitastor однопоточный и всегда таким останется, так как это самый оптимальный способ работы.
-  Если вам не хватает 1 ядра на 1 диск, просто делите диск на разделы и запускайте на нём несколько OSD.
-  Но, скорее всего, вам хватит и 1 ядра - Vitastor не так прожорлив к ресурсам CPU, как Ceph.
-- Журнал и метаданные всегда размещаются в памяти, благодаря чему никогда не тратится лишнее время
-  на чтение метаданных с диска. Размер метаданных линейно зависит от размера диска и блока данных,
-  который задаётся в конфигурации кластера и по умолчанию составляет 128 КБ. С блоком 128 КБ метаданные
-  занимают примерно 512 МБ памяти на 1 ТБ дискового пространства (и это всё равно меньше, чем нужно Ceph-у).
-  Журнал вообще не должен быть большим, например, тесты производительности в данном документе проводились
-  с журналом размером всего 16 МБ. Большой журнал, вероятно, даже вреден, т.к. "грязные" записи (записи,
-  не сброшенные из журнала) тоже занимают память и могут немного замедлять работу.
-- В Vitastor нет внутреннего copy-on-write. Я считаю, что реализация CoW-хранилища гораздо сложнее,
-  поэтому сложнее добиться устойчиво хороших результатов. Возможно, в один прекрасный день
-  я придумаю красивый алгоритм для CoW-хранилища, но пока нет - внутреннего CoW в Vitastor не будет.
-  Всё это не относится к "внешнему" CoW (снапшотам и клонам).
-- Базовый слой Vitastor - простое блочное хранилище с блоками фиксированного размера, а не сложное
-  объектное хранилище с расширенными возможностями, как в Ceph (RADOS).
-- В Vitastor есть режим "ленивых fsync", в котором OSD группирует запросы записи перед сбросом их
-  на диск, что позволяет получить лучшую производительность с дешёвыми настольными SSD без конденсаторов
-  ("Advanced Power Loss Protection" / "Capacitor-Based Power Loss Protection").
-  Тем не менее, такой режим всё равно медленнее использования нормальных серверных SSD и мгновенного
-  fsync, так как приводит к дополнительным операциям передачи данных по сети, поэтому рекомендуется
-  всё-таки использовать хорошие серверные диски, тем более, стоят они почти так же, как десктопные.
-- PG эфемерны. Это означает, что они не хранятся на дисках и существуют только в памяти работающих OSD.
-- Процессы восстановления оперируют отдельными объектами, а не целыми PG.
-- PGLOG-ов нет.
-- "Мониторы" не хранят данные. Конфигурация и состояние кластера хранятся в etcd в простых человекочитаемых
-  JSON-структурах. Мониторы Vitastor только следят за состоянием кластера и управляют перемещением данных.
-  В этом смысле монитор Vitastor не является критичным компонентом системы и больше похож на Ceph-овский
-  менеджер (MGR). Монитор Vitastor написан на node.js.
-- Распределение PG не основано на консистентных хешах. Вместо этого все маппинги PG хранятся прямо в etcd
-  (ибо нет никакой проблемы сохранить несколько сотен-тысяч записей в памяти, а не считать каждый раз хеши).
-  Перераспределение PG по OSD выполняется через математическую оптимизацию,
-  а конкретно, сведение задачи к ЛП (задаче линейного программирования) и решение оной с помощью утилиты
-  lp_solve. Такой подход позволяет обычно выравнивать распределение места почти идеально - равномерность
-  обычно составляет 96-99%, в отличие от Ceph, где на голом CRUSH-е без балансировщика обычно выходит 80-90%.
-  Также это позволяет минимизировать объём перемещения данных и случайность связей между OSD, а также менять
-  распределение вручную, не боясь сломать логику перебалансировки. В таком подходе есть и потенциальный
-  недостаток - есть предположение, что в очень большом кластере он может сломаться - однако вплоть до
-  нескольких сотен OSD подход точно работает нормально. Ну и, собственно, при необходимости легко
-  реализовать и консистентные хеши.
-- Отдельный слой, подобный слою "CRUSH-правил", отсутствует. Вы настраиваете схемы отказоустойчивости,
-  домены отказа и правила выбора OSD напрямую в конфигурации пулов.
-
-## Понимание сути производительности систем хранения
-
-Вкратце: для быстрой хранилки задержки важнее, чем пиковые iops-ы.
-
-Лучшая возможная задержка достигается при тестировании в 1 поток с глубиной очереди 1,
-что приблизительно означает минимально нагруженное состояние кластера. В данном случае
-IOPS = 1/задержка. Ни числом серверов, ни дисков, ни серверных процессов/потоков
-задержка не масштабируется... Она зависит только от того, насколько быстро один
-серверный процесс (и клиент) обрабатывают одну операцию.
-
-Почему задержки важны? Потому, что некоторые приложения *не могут* использовать глубину
-очереди больше 1, ибо их задача не параллелизуется. Важный пример - это все СУБД
-с поддержкой консистентности (ACID), потому что все они обеспечивают её через
-журналирование, а журналы пишутся последовательно и с fsync() после каждой операции.
-
-fsync, кстати - это ещё одна очень важная вещь, про которую почти всегда забывают в тестах.
-Смысл в том, что все современные диски имеют кэши/буферы записи и не гарантируют, что
-данные реально физически записываются на носитель до того, как вы делаете fsync(),
-который транслируется в команду сброса кэша операционной системой.
-
-Дешёвые SSD для настольных ПК и ноутбуков очень быстрые без fsync - NVMe диски, например,
-могут обработать порядка 80000 операций записи в секунду с глубиной очереди 1 без fsync.
-Однако с fsync, когда они реально вынуждены писать каждый блок данных во флеш-память,
-они выжимают лишь 1000-2000 операций записи в секунду (число практически постоянное
-для всех моделей SSD).
-
-Серверные SSD часто имеют суперконденсаторы, работающие как встроенный источник
-бесперебойного питания и дающие дискам успеть сбросить их DRAM-кэш в постоянную
-флеш-память при отключении питания. Благодаря этому диски с чистой совестью
-*игнорируют fsync*, так как точно знают, что данные из кэша доедут до постоянной
-памяти.
-
-Все наиболее известные программные СХД, например, Ceph и внутренние СХД, используемые
-такими облачными провайдерами, как Amazon, Google, Яндекс, медленные в смысле задержки.
-В лучшем случае они дают задержки от 0.3мс на чтение и 0.6мс на запись 4 КБ блоками
-даже при условии использования наилучшего возможного железа.
-
-И это в эпоху SSD, когда вы можете пойти на рынок и купить там SSD, задержка которого
-на чтение будет 0.1мс, а на запись - 0.04мс, за 100$ или даже дешевле.
-
-Когда мне нужно быстро протестировать производительность дисковой подсистемы, я
-использую следующие 6 команд, с небольшими вариациями:
-
-- Линейная запись:
-  `fio -ioengine=libaio -direct=1 -invalidate=1 -name=test -bs=4M -iodepth=32 -rw=write -runtime=60 -filename=/dev/sdX`
-- Линейное чтение:
-  `fio -ioengine=libaio -direct=1 -invalidate=1 -name=test -bs=4M -iodepth=32 -rw=read -runtime=60 -filename=/dev/sdX`
-- Запись в 1 поток (T1Q1):
-  `fio -ioengine=libaio -direct=1 -invalidate=1 -name=test -bs=4k -iodepth=1 -fsync=1 -rw=randwrite -runtime=60 -filename=/dev/sdX`
-- Чтение в 1 поток (T1Q1):
-  `fio -ioengine=libaio -direct=1 -invalidate=1 -name=test -bs=4k -iodepth=1 -rw=randread -runtime=60 -filename=/dev/sdX`
-- Параллельная запись (numjobs используется, когда 1 ядро CPU не может насытить диск):
-  `fio -ioengine=libaio -direct=1 -invalidate=1 -name=test -bs=4k -iodepth=128 [-numjobs=4 -group_reporting] -rw=randwrite -runtime=60 -filename=/dev/sdX`
-- Параллельное чтение (numjobs - аналогично):
-  `fio -ioengine=libaio -direct=1 -invalidate=1 -name=test -bs=4k -iodepth=128 [-numjobs=4 -group_reporting] -rw=randread -runtime=60 -filename=/dev/sdX`
-
-## Теоретическая максимальная производительность Vitastor
-
-При использовании репликации:
-- Задержка чтения в 1 поток (T1Q1): 1 сетевой RTT + 1 чтение с диска.
-- Запись+fsync в 1 поток:
-  - С мгновенным сбросом: 2 RTT + 1 запись.
-  - С отложенным ("ленивым") сбросом: 4 RTT + 1 запись + 1 fsync.
-- Параллельное чтение: сумма IOPS всех дисков либо производительность сети, если в сеть упрётся раньше.
-- Параллельная запись: сумма IOPS всех дисков / число реплик / WA либо производительность сети, если в сеть упрётся раньше.
-
-При использовании кодов коррекции ошибок (EC):
-- Задержка чтения в 1 поток (T1Q1): 1.5 RTT + 1 чтение.
-- Запись+fsync в 1 поток:
-  - С мгновенным сбросом: 3.5 RTT + 1 чтение + 2 записи.
-  - С отложенным ("ленивым") сбросом: 5.5 RTT + 1 чтение + 2 записи + 2 fsync.
-- Под 0.5 на самом деле подразумевается (k-1)/k, где k - число дисков данных,
-  что означает, что дополнительное обращение по сети не нужно, когда операция
-  чтения обслуживается локально.
-- Параллельное чтение: сумма IOPS всех дисков либо производительность сети, если в сеть упрётся раньше.
-- Параллельная запись: сумма IOPS всех дисков / общее число дисков данных и чётности / WA либо производительность сети, если в сеть упрётся раньше.
-  Примечание: IOPS дисков в данном случае надо брать в смешанном режиме чтения/записи в пропорции, аналогичной формулам выше.
-
-WA (мультипликатор записи) для 4 КБ блоков в Vitastor обычно составляет 3-5:
-1. Запись метаданных в журнал
-2. Запись блока данных в журнал
-3. Запись метаданных в БД
-4. Ещё одна запись метаданных в журнал при использовании EC
-5. Запись блока данных на диск данных
-
-Если вы найдёте SSD, хорошо работающий с 512-байтными блоками данных (Optane?),
-то 1, 3 и 4 можно снизить до 512 байт (1/8 от размера данных) и получить WA всего 2.375.
-
-Кроме того, WA снижается при использовании отложенного/ленивого сброса при параллельной
-нагрузке, т.к. блоки журнала записываются на диск только когда они заполняются или явным
-образом запрашивается fsync.
-
-## Пример сравнения с Ceph
-
-Железо - 4 сервера, в каждом:
-- 6x SATA SSD Intel D3-4510 3.84 TB
-- 2x Xeon Gold 6242 (16 cores @ 2.8 GHz)
-- 384 GB RAM
-- 1x 25 GbE сетевая карта (Mellanox ConnectX-4 LX), подключённая к свитчу Juniper QFX5200
-
-Экономия энергии CPU отключена. В тестах и Vitastor, и Ceph развёрнуто по 2 OSD на 1 SSD.
-
-Все результаты ниже относятся к случайной нагрузке 4 КБ блоками (если явно не указано обратное).
-
-Производительность голых дисков:
-- T1Q1 запись ~27000 iops (задержка ~0.037ms)
-- T1Q1 чтение ~9800 iops (задержка ~0.101ms)
-- T1Q32 запись ~60000 iops
-- T1Q32 чтение ~81700 iops
-
-Ceph 15.2.4 (Bluestore):
-- T1Q1 запись ~1000 iops (задержка ~1ms)
-- T1Q1 чтение ~1750 iops (задержка ~0.57ms)
-- T8Q64 запись ~100000 iops, потребление CPU процессами OSD около 40 ядер на каждом сервере
-- T8Q64 чтение ~480000 iops, потребление CPU процессами OSD около 40 ядер на каждом сервере
-
-Тесты в 8 потоков проводились на 8 400GB RBD образах со всех хостов (с каждого хоста запускалось 2 процесса fio).
-Это нужно потому, что в Ceph несколько RBD-клиентов, пишущих в 1 образ, очень сильно замедляются.
-
-Настройки RocksDB и Bluestore в Ceph не менялись, единственным изменением было отключение cephx_sign_messages.
-
-На самом деле, результаты теста не такие уж и плохие для Ceph (могло быть хуже).
-Собственно говоря, эти серверы как раз хорошо сбалансированы для Ceph - 6 SATA SSD как раз
-утилизируют 25-гигабитную сеть, а без 2 мощных процессоров Ceph-у бы не хватило ядер,
-чтобы выдать пристойный результат. Собственно, что и показывает жор 40 ядер в процессе
-параллельного теста.
-
-Vitastor:
-- T1Q1 запись: 7087 iops (задержка 0.14ms)
-- T1Q1 чтение: 6838 iops (задержка 0.145ms)
-- T2Q64 запись: 162000 iops, потребление CPU - 3 ядра на каждом сервере
-- T8Q64 чтение: 895000 iops, потребление CPU - 4 ядра на каждом сервере
-- Линейная запись (4M T1Q32): 2800 МБ/с
-- Линейное чтение (4M T1Q32): 1500 МБ/с
-
-Тест на чтение в 8 потоков проводился на 1 большом образе (3.2 ТБ) со всех хостов (опять же, по 2 fio с каждого).
-В Vitastor никакой разницы между 1 образом и 8-ю нет. Естественно, примерно 1/4 запросов чтения
-в такой конфигурации, как и в тестах Ceph выше, обслуживалась с локальной машины. Если проводить
-тест так, чтобы все операции всегда обращались к первичным OSD по сети - тест сильнее упирался
-в сеть и результат составлял примерно 689000 iops.
-
-Настройки Vitastor: `--disable_data_fsync true --immediate_commit all --flusher_count 8
-  --disk_alignment 4096 --journal_block_size 4096 --meta_block_size 4096
-  --journal_no_same_sector_overwrites true --journal_sector_buffer_count 1024
-  --journal_size 16777216`.
-
-### EC/XOR 2+1
-
-Vitastor:
-- T1Q1 запись: 2808 iops (задержка ~0.355ms)
-- T1Q1 чтение: 6190 iops (задержка ~0.16ms)
-- T2Q64 запись: 85500 iops, потребление CPU - 3.4 ядра на каждом сервере
-- T8Q64 чтение: 812000 iops, потребление CPU - 4.7 ядра на каждом сервере
-- Линейная запись (4M T1Q32): 3200 МБ/с
-- Линейное чтение (4M T1Q32): 1800 МБ/с
-
-Ceph:
-- T1Q1 запись: 730 iops (задержка ~1.37ms latency)
-- T1Q1 чтение: 1500 iops с холодным кэшем метаданных (задержка ~0.66ms), 2300 iops через 2 минуты прогрева (задержка ~0.435ms)
-- T4Q128 запись (4 RBD images): 45300 iops, потребление CPU - 30 ядер на каждом сервере
-- T8Q64 чтение (4 RBD images): 278600 iops, потребление CPU - 40 ядер на каждом сервере
-- Линейная запись (4M T1Q32): 1950 МБ/с в пустой образ, 2500 МБ/с в заполненный образ
-- Линейное чтение (4M T1Q32): 2400 МБ/с
-
-### NBD
-
-NBD расшифровывается как "сетевое блочное устройство", но на самом деле оно также
-работает просто как аналог FUSE для блочных устройств, то есть, представляет собой
-"блочное устройство в пространстве пользователя".
-
-NBD - на данный момент единственный способ монтировать Vitastor ядром Linux.
-NBD немного снижает производительность, так как приводит к дополнительным копированиям
-данных между ядром и пространством пользователя. Тем не менее, способ достаточно оптимален,
-а производительность случайного доступа вообще затрагивается слабо.
-
-Vitastor с однопоточной NBD прокси на том же стенде:
-- T1Q1 запись: 6000 iops (задержка 0.166ms)
-- T1Q1 чтение: 5518 iops (задержка 0.18ms)
-- T1Q128 запись: 94400 iops
-- T1Q128 чтение: 103000 iops
-- Линейная запись (4M T1Q128): 1266 МБ/с (в сравнении с 2800 МБ/с через fio)
-- Линейное чтение (4M T1Q128): 975 МБ/с (в сравнении с 1500 МБ/с через fio)
-
-## Установка
-
-### Debian
-
-- Добавьте ключ репозитория Vitastor:
-  `wget -q -O - https://vitastor.io/debian/pubkey | sudo apt-key add -`
-- Добавьте репозиторий Vitastor в /etc/apt/sources.list:
-  - Debian 11 (Bullseye/Sid): `deb https://vitastor.io/debian bullseye main`
-  - Debian 10 (Buster): `deb https://vitastor.io/debian buster main`
-- Для Debian 10 (Buster) также включите репозиторий backports:
-  `deb http://deb.debian.org/debian buster-backports main`
-- Установите пакеты: `apt update; apt install vitastor lp-solve etcd linux-image-amd64 qemu`
-
-### CentOS
-
-- Добавьте в систему репозиторий Vitastor:
-  - CentOS 7: `yum install https://vitastor.io/rpms/centos/7/vitastor-release-1.0-1.el7.noarch.rpm`
-  - CentOS 8: `dnf install https://vitastor.io/rpms/centos/8/vitastor-release-1.0-1.el8.noarch.rpm`
-- Включите EPEL: `yum/dnf install epel-release`
-- Включите дополнительные репозитории CentOS:
-  - CentOS 7: `yum install centos-release-scl`
-  - CentOS 8: `dnf install centos-release-advanced-virtualization`
-- Включите elrepo-kernel:
-  - CentOS 7: `yum install https://www.elrepo.org/elrepo-release-7.el7.elrepo.noarch.rpm`
-  - CentOS 8: `dnf install https://www.elrepo.org/elrepo-release-8.el8.elrepo.noarch.rpm`
-- Установите пакеты: `yum/dnf install vitastor lpsolve etcd kernel-ml qemu-kvm`
-
-### Установка из исходников
-
-- Установите ядро 5.4 или более новое, для поддержки io_uring. Желательно 5.8 или даже новее,
-  так как в 5.4 есть как минимум 1 известный баг, ведущий к зависанию с io_uring и контроллером HP SmartArray.
-- Установите liburing 0.4 или более новый и его заголовки.
-- Установите lp_solve.
-- Установите etcd, версии не ниже 3.4.15. Более ранние версии работать не будут из-за различных багов,
-  например [#12402](https://github.com/etcd-io/etcd/pull/12402). Также вы можете взять версию 3.4.13 с
-  этим конкретным исправлением из ветки release-3.4 репозитория https://github.com/vitalif/etcd/.
-- Установите node.js 10 или новее.
-- Установите gcc и g++ 8.x или новее.
-- Склонируйте данный репозиторий с подмодулями: `git clone https://yourcmc.ru/git/vitalif/vitastor/`.
-- Желательно пересобрать QEMU с патчем, который делает необязательным запуск через LD_PRELOAD.
-  См `patches/qemu-*.*-vitastor.patch` - выберите версию, наиболее близкую вашей версии QEMU.
-- Установите QEMU 3.0 или новее, возьмите исходные коды установленного пакета, начните его пересборку,
-  через некоторое время остановите её и скопируйте следующие заголовки:
-   - `<qemu>/include` &rarr; `<vitastor>/qemu/include`
-   - Debian:
-      * Берите qemu из основного репозитория
-      * `<qemu>/b/qemu/config-host.h` &rarr; `<vitastor>/qemu/b/qemu/config-host.h`
-      * `<qemu>/b/qemu/qapi` &rarr; `<vitastor>/qemu/b/qemu/qapi`
-   - CentOS 8:
-      * Берите qemu из репозитория Advanced-Virtualization. Чтобы включить его, запустите
-        `yum install centos-release-advanced-virtualization.noarch` и далее `yum install qemu`
-      * `<qemu>/config-host.h` &rarr; `<vitastor>/qemu/b/qemu/config-host.h`
-      * Для QEMU 3.0+: `<qemu>/qapi` &rarr; `<vitastor>/qemu/b/qemu/qapi`
-      * Для QEMU 2.0+: `<qemu>/qapi-types.h` &rarr; `<vitastor>/qemu/b/qemu/qapi-types.h`
-   - `config-host.h` и `qapi` нужны, т.к. в них содержатся автогенерируемые заголовки
-- Установите fio 3.7 или новее, возьмите исходники пакета и сделайте на них симлинк с `<vitastor>/fio`.
-- Соберите и установите Vitastor командой `mkdir build && cd build && cmake .. && make -j8 && make install`.
-  Обратите внимание на переменную cmake `QEMU_PLUGINDIR` - под RHEL её нужно установить равной `qemu-kvm`.
-
-## Запуск
-
-Внимание: процедура пока что достаточно нетривиальная, задавать конфигурацию и смещения
-на диске нужно почти вручную. Это будет исправлено в ближайшем будущем.
-
-- Желательны SATA SSD или NVMe диски с конденсаторами (серверные SSD). Можно использовать и
-  десктопные SSD, включив режим отложенного fsync, но производительность однопоточной записи
-  в этом случае пострадает.
-- Быстрая сеть, минимум 10 гбит/с
-- Для наилучшей производительности нужно отключить энергосбережение CPU: `cpupower idle-set -D 0 && cpupower frequency-set -g performance`.
-- Пропишите нужные вам значения вверху файлов `/usr/lib/vitastor/mon/make-units.sh` и `/usr/lib/vitastor/mon/make-osd.sh`.
-- Создайте юниты systemd для etcd и мониторов: `/usr/lib/vitastor/mon/make-units.sh`
-- Создайте юниты для OSD: `/usr/lib/vitastor/mon/make-osd.sh /dev/disk/by-partuuid/XXX [/dev/disk/by-partuuid/YYY ...]`
-- Вы можете поменять параметры OSD в юнитах systemd. Смысл некоторых параметров:
-  - `disable_data_fsync 1` - отключает fsync, используется с SSD с конденсаторами.
-  - `immediate_commit all` - используется с SSD с конденсаторами.
-  - `disable_device_lock 1` - отключает блокировку файла устройства, нужно, только если вы запускаете
-    несколько OSD на одном блочном устройстве.
-  - `flusher_count 256` - "flusher" - микропоток, удаляющий старые данные из журнала.
-    Не волнуйтесь об этой настройке, 256 теперь достаточно практически всегда.
-  - `disk_alignment`, `journal_block_size`, `meta_block_size` следует установить равными размеру
-    внутреннего блока SSD. Это почти всегда 4096.
-  - `journal_no_same_sector_overwrites true` запрещает перезапись одного и того же сектора журнала подряд
-    много раз в процессе записи. Большинство (99%) SSD не нуждаются в данной опции. Однако выяснилось, что
-    диски, используемые на одном из тестовых стендов - Intel D3-S4510 - очень сильно не любят такую
-    перезапись, и для них была добавлена эта опция. Когда данный режим включён, также нужно поднимать
-    значение `journal_sector_buffer_count`, так как иначе Vitastor не хватит буферов для записи в журнал.
-- Запустите все etcd: `systemctl start etcd`
-- Создайте глобальную конфигурацию в etcd: `etcdctl --endpoints=... put /vitastor/config/global '{"immediate_commit":"all"}'`
-  (если все ваши диски - серверные с конденсаторами).
-- Создайте пулы: `etcdctl --endpoints=... put /vitastor/config/pools '{"1":{"name":"testpool","scheme":"replicated","pg_size":2,"pg_minsize":1,"pg_count":256,"failure_domain":"host"}}'`.
-  Для jerasure EC-пулов конфигурация должна выглядеть так: `2:{"name":"ecpool","scheme":"jerasure","pg_size":4,"parity_chunks":2,"pg_minsize":2,"pg_count":256,"failure_domain":"host"}`.
-- Запустите все OSD: `systemctl start vitastor.target`
-- Ваш кластер должен быть готов - один из мониторов должен уже сконфигурировать PG, а OSD должны запустить их.
-- Вы можете проверить состояние PG прямо в etcd: `etcdctl --endpoints=... get --prefix /vitastor/pg/state`. Все PG должны быть 'active'.
-
-### Задать имя образу
-
-```
-etcdctl --endpoints=<etcd> put /vitastor/config/inode/<pool>/<inode> '{"name":"<name>","size":<size>[,"parent_id":<parent_inode_number>][,"readonly":true]}'
-```
-
-Например:
-
-```
-etcdctl --endpoints=http://10.115.0.10:2379/v3 put /vitastor/config/inode/1/1 '{"name":"testimg","size":2147483648}'
-```
-
-Если вы зададите parent_id, то образ станет CoW-клоном, т.е. все новые запросы записи пойдут в новый инод, а запросы
-чтения будут проверять сначала его, а потом родительские слои по цепочке вверх. Чтобы случайно не перезаписать данные
-в родительском слое, вы можете переключить его в режим "только чтение", добавив флаг `"readonly":true` в его запись
-метаданных. В таком случае родительский образ становится просто снапшотом.
-
-Таким образом, для создания снапшота вам нужно просто переименовать предыдущий inode (например, из testimg в testimg@0),
-сделать его readonly и создать новый слой с исходным именем образа (testimg), ссылающийся на только что переименованный
-в качестве родительского.
-
-### Запуск тестов с fio
-
-Пример команды для запуска тестов:
-
-```
-fio -thread -ioengine=libfio_vitastor.so -name=test -bs=4M -direct=1 -iodepth=16 -rw=write -etcd=10.115.0.10:2379/v3 -image=testimg
-```
-
-Если вы не хотите обращаться к образу по имени, вместо `-image=testimg` можно указать номер пула, номер инода и размер:
-`-pool=1 -inode=1 -size=400G`.
-
-### Загрузить образ диска ВМ в/из Vitastor
-
-Используйте qemu-img и строку `vitastor:etcd_host=<HOST>:image=<IMAGE>` в качестве имени файла диска. Например:
-
-```
-qemu-img convert -f qcow2 debian10.qcow2 -p -O raw 'vitastor:etcd_host=10.115.0.10\:2379/v3:image=testimg'
-```
-
-Обратите внимание, что если вы используете немодифицированный QEMU, потребуется установить переменную окружения
-`LD_PRELOAD=/usr/lib/x86_64-linux-gnu/qemu/block-vitastor.so`.
-
-Если вы не хотите обращаться к образу по имени, вместо `:image=<IMAGE>` можно указать номер пула, номер инода и размер:
-`:pool=<POOL>:inode=<INODE>:size=<SIZE>`.
-
-### Запустить ВМ
-
-Для запуска QEMU используйте опцию `-drive file=vitastor:etcd_host=<HOST>:image=<IMAGE>` (аналогично qemu-img)
-и физический размер блока 4 KB.
-
-Например:
-
-```
-qemu-system-x86_64 -enable-kvm -m 1024
-  -drive 'file=vitastor:etcd_host=10.115.0.10\:2379/v3:image=testimg',format=raw,if=none,id=drive-virtio-disk0,cache=none
-  -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1,write-cache=off,physical_block_size=4096,logical_block_size=512
-  -vnc 0.0.0.0:0
-```
-
-Обращение по номерам (`:pool=<POOL>:inode=<INODE>:size=<SIZE>` вместо `:image=<IMAGE>`) работает аналогично qemu-img.
-
-### Удалить образ
-
-Используйте утилиту vitastor-rm. Например:
-
-```
-vitastor-rm --etcd_address 10.115.0.10:2379/v3 --pool 1 --inode 1 --parallel_osds 16 --iodepth 32
-```
-
-### NBD
-
-Чтобы создать локальное блочное устройство, используйте NBD. Например:
-
-```
-vitastor-nbd map --etcd_address 10.115.0.10:2379/v3 --image testimg
-```
-
-Команда напечатает название устройства вида /dev/nbd0, которое потом можно будет форматировать
-и использовать как обычное блочное устройство.
-
-Для обращения по номеру инода, аналогично другим командам, можно использовать опции
-`--pool <POOL> --inode <INODE> --size <SIZE>` вместо `--image testimg`.
-
-### Kubernetes
-
-У Vitastor есть CSI-плагин для Kubernetes, поддерживающий RWO-тома.
-
-Для установки возьмите манифесты из директории [csi/deploy/](csi/deploy/), поместите
-вашу конфигурацию подключения к Vitastor в [csi/deploy/001-csi-config-map.yaml](001-csi-config-map.yaml),
-настройте StorageClass в [csi/deploy/009-storage-class.yaml](009-storage-class.yaml)
-и примените все `NNN-*.yaml` к вашей инсталляции Kubernetes.
-
-```
-for i in ./???-*.yaml; do kubectl apply -f $i; done
-```
-
-После этого вы сможете создавать PersistentVolume. Пример смотрите в файле [csi/deploy/example-pvc.yaml](csi/deploy/example-pvc.yaml).
-
-## Известные проблемы
-
-- Запросы удаления объектов могут в данный момент приводить к "неполным" объектам в EC-пулах,
-  если в процессе удаления произойдут отказы OSD или серверов, потому что правильная обработка
-  запросов удаления в кластере должна быть "трёхфазной", а это пока не реализовано. Если вы
-  столкнётесь с такой ситуацией, просто повторите запрос удаления.
-
-## Принципы реализации
-
-- Я люблю архитектурно простые решения. Vitastor проектируется именно так и я намерен
-  и далее следовать данному принципу.
-- Если вы пришли сюда за идеальным кодом на C++, вы, вероятно, не по адресу. "Общепринятые"
-  практики написания C++ кода меня не очень волнуют, так как зачастую, опять-таки, ведут к
-  излишним усложнениям и код получается красивый... но медленный.
-- По той же причине в коде иногда можно встретить велосипеды типа собственного упрощённого
-  HTTP-клиента для работы с etcd. Зато эти велосипеды маленькие и компактные и не требуют
-  использования десятка внешних библиотек.
-- node.js для монитора - не случайный выбор. Он очень быстрый, имеет встроенную событийную
-  машину, приятный нейтральный C-подобный язык программирования и развитую инфраструктуру.
-
-## Автор и лицензия
-
-Автор: Виталий Филиппов (vitalif [at] yourcmc.ru), 2019+
-
-Заходите в Telegram-чат Vitastor: https://t.me/vitastor
-
-Лицензия: VNPL 1.1 на серверный код и двойная VNPL 1.1 + GPL 2.0+ на клиентский.
-
-VNPL - "сетевой копилефт", собственная свободная копилефт-лицензия
-Vitastor Network Public License 1.1, основанная на GNU GPL 3.0 с дополнительным
-условием "Сетевого взаимодействия", требующим распространять все программы,
-специально разработанные для использования вместе с Vitastor и взаимодействующие
-с ним по сети, под лицензией VNPL или под любой другой свободной лицензией.
-
-Идея VNPL - расширение действия копилефта не только на модули, явным образом
-связываемые с кодом Vitastor, но также на модули, оформленные в виде микросервисов
-и взаимодействующие с ним по сети.
-
-Таким образом, если вы хотите построить на основе Vitastor сервис, содержаший
-компоненты с закрытым кодом, взаимодействующие с Vitastor, вам нужна коммерческая
-лицензия от автора 😀.
-
-На Windows и любое другое ПО, не разработанное *специально* для использования
-вместе с Vitastor, никакие ограничения не накладываются.
-
-Клиентские библиотеки распространяются на условиях двойной лицензии VNPL 1.0
-и также на условиях GNU GPL 2.0 или более поздней версии. Так сделано в целях
-совместимости с таким ПО, как QEMU и fio.
-
-Вы можете найти полный текст VNPL 1.1 в файле [VNPL-1.1.txt](VNPL-1.1.txt),
-а GPL 2.0 в файле [GPL-2.0.txt](GPL-2.0.txt).

README.md

@@ -1,530 +0,0 @@
-## Vitastor
-
-[Читать на русском](README-ru.md)
-
-## The Idea
-
-Make Software-Defined Block Storage Great Again.
-
-Vitastor is a small, simple and fast clustered block storage (storage for VM drives),
-architecturally similar to Ceph which means strong consistency, primary-replication, symmetric
-clustering and automatic data distribution over any number of drives of any size
-with configurable redundancy (replication or erasure codes/XOR).
-
-## Features
-
-Vitastor is currently a pre-release, a lot of features are missing and you can still expect
-breaking changes in the future. However, the following is implemented:
-
-- Basic part: highly-available block storage with symmetric clustering and no SPOF
-- Performance ;-D
-- Multiple redundancy schemes: Replication, XOR n+1, Reed-Solomon erasure codes
-  based on jerasure library with any number of data and parity drives in a group
-- Configuration via simple JSON data structures in etcd
-- Automatic data distribution over OSDs, with support for:
-  - Mathematical optimization for better uniformity and less data movement
-  - Multiple pools
-  - Placement tree, OSD selection by tags (device classes) and placement root
-  - Configurable failure domains
-- Recovery of degraded blocks
-- Rebalancing (data movement between OSDs)
-- Lazy fsync support
-- I/O statistics reporting to etcd
-- Generic user-space client library
-- QEMU driver (built out-of-tree)
-- Loadable fio engine for benchmarks (also built out-of-tree)
-- NBD proxy for kernel mounts
-- Inode removal tool (vitastor-rm)
-- Packaging for Debian and CentOS
-- Per-inode I/O and space usage statistics
-- Inode metadata storage in etcd
-- Snapshots and copy-on-write image clones
-- Write throttling to smooth random write workloads in SSD+HDD configurations
-- RDMA/RoCEv2 support via libibverbs
-- CSI plugin for Kubernetes
-- Basic OpenStack support: Cinder driver, Nova and libvirt patches
-
-## Roadmap
-
-- Snapshot deletion (layer merge) support
-- Better OSD creation and auto-start tools
-- Other administrative tools
-- Plugins for OpenNebula, Proxmox and other cloud systems
-- iSCSI proxy
-- Faster failover
-- Scrubbing without checksums (verification of replicas)
-- Checksums
-- Tiered storage
-- NVDIMM support
-- Web GUI
-- Compression (possibly)
-- Read caching using system page cache (possibly)
-
-## Architecture
-
-Similarities:
-
-- Just like Ceph, Vitastor has Pools, PGs, OSDs, Monitors, Failure Domains, Placement Tree.
-- Just like Ceph, Vitastor is transactional (even though there's a "lazy fsync mode" which
-  doesn't implicitly flush every operation to disks).
-- OSDs also have journal and metadata and they can also be put on separate drives.
-- Just like in Ceph, client library attempts to recover from any cluster failure so
-  you can basically reboot the whole cluster and only pause, but not crash, your clients
-  (I consider this a bug if the client crashes in that case).
-
-Some basic terms for people not familiar with Ceph:
-
-- OSD (Object Storage Daemon) is a process that stores data and serves read/write requests.
-- PG (Placement Group) is a container for data that (normally) shares the same replicas.
-- Pool is a container for data that has the same redundancy scheme and placement rules.
-- Monitor is a separate daemon that watches cluster state and handles failures.
-- Failure Domain is a group of OSDs that you allow to fail. It's "host" by default.
-- Placement Tree groups OSDs in a hierarchy to later split them into Failure Domains.
-
-Architectural differences from Ceph:
-
-- Vitastor's primary focus is on SSDs. Proper SSD+HDD optimizations may be added in the future, though.
-- Vitastor OSD is (and will always be) single-threaded. If you want to dedicate more than 1 core
-  per drive you should run multiple OSDs each on a different partition of the drive.
-  Vitastor isn't CPU-hungry though (as opposed to Ceph), so 1 core is sufficient in a lot of cases.
-- Metadata and journal are always kept in memory. Metadata size depends linearly on drive capacity
-  and data store block size which is 128 KB by default. With 128 KB blocks metadata should occupy
-  around 512 MB per 1 TB (which is still less than Ceph wants). Journal doesn't have to be big,
-  the example test below was conducted with only 16 MB journal. A big journal is probably even
-  harmful as dirty write metadata also take some memory.
-- Vitastor storage layer doesn't have internal copy-on-write or redirect-write. I know that maybe
-  it's possible to create a good copy-on-write storage, but it's much harder and makes performance
-  less deterministic, so CoW isn't used in Vitastor.
-- The basic layer of Vitastor is block storage with fixed-size blocks, not object storage with
-  rich semantics like in Ceph (RADOS).
-- There's a "lazy fsync" mode which allows to batch writes before flushing them to the disk.
-  This allows to use Vitastor with desktop SSDs, but still lowers performance due to additional
-  network roundtrips, so use server SSDs with capacitor-based power loss protection
-  ("Advanced Power Loss Protection") for best performance.
-- PGs are ephemeral. This means that they aren't stored on data disks and only exist in memory
-  while OSDs are running.
-- Recovery process is per-object (per-block), not per-PG. Also there are no PGLOGs.
-- Monitors don't store data. Cluster configuration and state is stored in etcd in simple human-readable
-  JSON structures. Monitors only watch cluster state and handle data movement.
-  Thus Vitastor's Monitor isn't a critical component of the system and is more similar to Ceph's Manager.
-  Vitastor's Monitor is implemented in node.js.
-- PG distribution isn't based on consistent hashes. All PG mappings are stored in etcd.
-  Rebalancing PGs between OSDs is done by mathematical optimization - data distribution problem
-  is reduced to a linear programming problem and solved by lp_solve. This allows for almost
-  perfect (96-99% uniformity compared to Ceph's 80-90%) data distribution in most cases, ability
-  to map PGs by hand without breaking rebalancing logic, reduced OSD peer-to-peer communication
-  (on average, OSDs have fewer peers) and less data movement. It also probably has a drawback -
-  this method may fail in very large clusters, but up to several hundreds of OSDs it's perfectly fine.
-  It's also easy to add consistent hashes in the future if something proves their necessity.
-- There's no separate CRUSH layer. You select pool redundancy scheme, placement root, failure domain
-  and so on directly in pool configuration.
-
-## Understanding Storage Performance
-
-The most important thing for fast storage is latency, not parallel iops.
-
-The best possible latency is achieved with one thread and queue depth of 1 which basically means
-"client load as low as possible". In this case IOPS = 1/latency, and this number doesn't
-scale with number of servers, drives, server processes or threads and so on.
-Single-threaded IOPS and latency numbers only depend on *how fast a single daemon is*.
-
-Why is it important? It's important because some of the applications *can't* use
-queue depth greater than 1 because their task isn't parallelizable. A notable example
-is any ACID DBMS because all of them write their WALs sequentially with fsync()s.
-
-fsync, by the way, is another important thing often missing in benchmarks. The point is
-that drives have cache buffers and don't guarantee that your data is actually persisted
-until you call fsync() which is translated to a FLUSH CACHE command by the OS.
-
-Desktop SSDs are very fast without fsync - NVMes, for example, can process ~80000 write
-operations per second with queue depth of 1 without fsync - but they're really slow with
-fsync because they have to actually write data to flash chips when you call fsync. Typical
-number is around 1000-2000 iops with fsync.
-
-Server SSDs often have supercapacitors that act as a built-in UPS and allow the drive
-to flush its DRAM cache to the persistent flash storage when a power loss occurs.
-This makes them perform equally well with and without fsync. This feature is called
-"Advanced Power Loss Protection" by Intel; other vendors either call it similarly
-or directly as "Full Capacitor-Based Power Loss Protection".
-
-All software-defined storages that I currently know are slow in terms of latency.
-Notable examples are Ceph and internal SDSes used by cloud providers like Amazon, Google,
-Yandex and so on. They're all slow and can only reach ~0.3ms read and ~0.6ms 4 KB write latency
-with best-in-slot hardware.
-
-And that's in the SSD era when you can buy an SSD that has ~0.04ms latency for 100 $.
-
-I use the following 6 commands with small variations to benchmark any storage:
-
-- Linear write:
-  `fio -ioengine=libaio -direct=1 -invalidate=1 -name=test -bs=4M -iodepth=32 -rw=write -runtime=60 -filename=/dev/sdX`
-- Linear read:
-  `fio -ioengine=libaio -direct=1 -invalidate=1 -name=test -bs=4M -iodepth=32 -rw=read -runtime=60 -filename=/dev/sdX`
-- Random write latency (T1Q1, this hurts storages the most):
-  `fio -ioengine=libaio -direct=1 -invalidate=1 -name=test -bs=4k -iodepth=1 -fsync=1 -rw=randwrite -runtime=60 -filename=/dev/sdX`
-- Random read latency (T1Q1):
-  `fio -ioengine=libaio -direct=1 -invalidate=1 -name=test -bs=4k -iodepth=1 -rw=randread -runtime=60 -filename=/dev/sdX`
-- Parallel write iops (use numjobs if a single CPU core is insufficient to saturate the load):
-  `fio -ioengine=libaio -direct=1 -invalidate=1 -name=test -bs=4k -iodepth=128 [-numjobs=4 -group_reporting] -rw=randwrite -runtime=60 -filename=/dev/sdX`
-- Parallel read iops (use numjobs if a single CPU core is insufficient to saturate the load):
-  `fio -ioengine=libaio -direct=1 -invalidate=1 -name=test -bs=4k -iodepth=128 [-numjobs=4 -group_reporting] -rw=randread -runtime=60 -filename=/dev/sdX`
-
-## Vitastor's Theoretical Maximum Random Access Performance
-
-Replicated setups:
-- Single-threaded (T1Q1) read latency: 1 network roundtrip + 1 disk read.
-- Single-threaded write+fsync latency:
-  - With immediate commit: 2 network roundtrips + 1 disk write.
-  - With lazy commit: 4 network roundtrips + 1 disk write + 1 disk flush.
-- Saturated parallel read iops: min(network bandwidth, sum(disk read iops)).
-- Saturated parallel write iops: min(network bandwidth, sum(disk write iops / number of replicas / write amplification)).
-
-EC/XOR setups:
-- Single-threaded (T1Q1) read latency: 1.5 network roundtrips + 1 disk read.
-- Single-threaded write+fsync latency:
-  - With immediate commit: 3.5 network roundtrips + 1 disk read + 2 disk writes.
-  - With lazy commit: 5.5 network roundtrips + 1 disk read + 2 disk writes + 2 disk fsyncs.
-  - 0.5 in actually (k-1)/k which means that an additional roundtrip doesn't happen when
-    the read sub-operation can be served locally.
-- Saturated parallel read iops: min(network bandwidth, sum(disk read iops)).
-- Saturated parallel write iops: min(network bandwidth, sum(disk write iops * number of data drives / (number of data + parity drives) / write amplification)).
-  In fact, you should put disk write iops under the condition of ~10% reads / ~90% writes in this formula.
-
-Write amplification for 4 KB blocks is usually 3-5 in Vitastor:
-1. Journal block write
-2. Journal data write
-3. Metadata block write
-4. Another journal block write for EC/XOR setups
-5. Data block write
-
-If you manage to get an SSD which handles 512 byte blocks well (Optane?) you may
-lower 1, 3 and 4 to 512 bytes (1/8 of data size) and get WA as low as 2.375.
-
-Lazy fsync also reduces WA for parallel workloads because journal blocks are only
-written when they fill up or fsync is requested.
-
-## Example Comparison with Ceph
-
-Hardware configuration: 4 nodes, each with:
-- 6x SATA SSD Intel D3-4510 3.84 TB
-- 2x Xeon Gold 6242 (16 cores @ 2.8 GHz)
-- 384 GB RAM
-- 1x 25 GbE network interface (Mellanox ConnectX-4 LX), connected to a Juniper QFX5200 switch
-
-CPU powersaving was disabled. Both Vitastor and Ceph were configured with 2 OSDs per 1 SSD.
-
-All of the results below apply to 4 KB blocks and random access (unless indicated otherwise).
-
-Raw drive performance:
-- T1Q1 write ~27000 iops (~0.037ms latency)
-- T1Q1 read ~9800 iops (~0.101ms latency)
-- T1Q32 write ~60000 iops
-- T1Q32 read ~81700 iops
-
-Ceph 15.2.4 (Bluestore):
-- T1Q1 write ~1000 iops (~1ms latency)
-- T1Q1 read ~1750 iops (~0.57ms latency)
-- T8Q64 write ~100000 iops, total CPU usage by OSDs about 40 virtual cores on each node
-- T8Q64 read ~480000 iops, total CPU usage by OSDs about 40 virtual cores on each node
-
-T8Q64 tests were conducted over 8 400GB RBD images from all hosts (every host was running 2 instances of fio).
-This is because Ceph has performance penalties related to running multiple clients over a single RBD image.
-
-cephx_sign_messages was set to false during tests, RocksDB and Bluestore settings were left at defaults.
-
-In fact, not that bad for Ceph. These servers are an example of well-balanced Ceph nodes.
-However, CPU usage and I/O latency were through the roof, as usual.
-
-Vitastor:
-- T1Q1 write: 7087 iops (0.14ms latency)
-- T1Q1 read: 6838 iops (0.145ms latency)
-- T2Q64 write: 162000 iops, total CPU usage by OSDs about 3 virtual cores on each node
-- T8Q64 read: 895000 iops, total CPU usage by OSDs about 4 virtual cores on each node
-- Linear write (4M T1Q32): 2800 MB/s
-- Linear read (4M T1Q32): 1500 MB/s
-
-T8Q64 read test was conducted over 1 larger inode (3.2T) from all hosts (every host was running 2 instances of fio).
-Vitastor has no performance penalties related to running multiple clients over a single inode.
-If conducted from one node with all primary OSDs moved to other nodes the result was slightly lower (689000 iops),
-this is because all operations resulted in network roundtrips between the client and the primary OSD.
-When fio was colocated with OSDs (like in Ceph benchmarks above), 1/4 of the read workload actually
-used the loopback network.
-
-Vitastor was configured with: `--disable_data_fsync true --immediate_commit all --flusher_count 8
-  --disk_alignment 4096 --journal_block_size 4096 --meta_block_size 4096
-  --journal_no_same_sector_overwrites true --journal_sector_buffer_count 1024
-  --journal_size 16777216`.
-
-### EC/XOR 2+1
-
-Vitastor:
-- T1Q1 write: 2808 iops (~0.355ms latency)
-- T1Q1 read: 6190 iops (~0.16ms latency)
-- T2Q64 write: 85500 iops, total CPU usage by OSDs about 3.4 virtual cores on each node
-- T8Q64 read: 812000 iops, total CPU usage by OSDs about 4.7 virtual cores on each node
-- Linear write (4M T1Q32): 3200 MB/s
-- Linear read (4M T1Q32): 1800 MB/s
-
-Ceph:
-- T1Q1 write: 730 iops (~1.37ms latency)
-- T1Q1 read: 1500 iops with cold cache (~0.66ms latency), 2300 iops after 2 minute metadata cache warmup (~0.435ms latency)
-- T4Q128 write (4 RBD images): 45300 iops, total CPU usage by OSDs about 30 virtual cores on each node
-- T8Q64 read (4 RBD images): 278600 iops, total CPU usage by OSDs about 40 virtual cores on each node
-- Linear write (4M T1Q32): 1950 MB/s before preallocation, 2500 MB/s after preallocation
-- Linear read (4M T1Q32): 2400 MB/s
-
-### NBD
-
-NBD is currently required to mount Vitastor via kernel, but it imposes additional overhead
-due to additional copying between the kernel and userspace. This mostly hurts linear
-bandwidth, not iops.
-
-Vitastor with single-thread NBD on the same hardware:
-- T1Q1 write: 6000 iops (0.166ms latency)
-- T1Q1 read: 5518 iops (0.18ms latency)
-- T1Q128 write: 94400 iops
-- T1Q128 read: 103000 iops
-- Linear write (4M T1Q128): 1266 MB/s (compared to 2800 MB/s via fio)
-- Linear read (4M T1Q128): 975 MB/s (compared to 1500 MB/s via fio)
-
-## Installation
-
-### Debian
-
-- Trust Vitastor package signing key:
-  `wget -q -O - https://vitastor.io/debian/pubkey | sudo apt-key add -`
-- Add Vitastor package repository to your /etc/apt/sources.list:
-  - Debian 11 (Bullseye/Sid): `deb https://vitastor.io/debian bullseye main`
-  - Debian 10 (Buster): `deb https://vitastor.io/debian buster main`
-- For Debian 10 (Buster) also enable backports repository:
-  `deb http://deb.debian.org/debian buster-backports main`
-- Install packages: `apt update; apt install vitastor lp-solve etcd linux-image-amd64 qemu`
-
-### CentOS
-
-- Add Vitastor package repository:
-  - CentOS 7: `yum install https://vitastor.io/rpms/centos/7/vitastor-release-1.0-1.el7.noarch.rpm`
-  - CentOS 8: `dnf install https://vitastor.io/rpms/centos/8/vitastor-release-1.0-1.el8.noarch.rpm`
-- Enable EPEL: `yum/dnf install epel-release`
-- Enable additional CentOS repositories:
-  - CentOS 7: `yum install centos-release-scl`
-  - CentOS 8: `dnf install centos-release-advanced-virtualization`
-- Enable elrepo-kernel:
-  - CentOS 7: `yum install https://www.elrepo.org/elrepo-release-7.el7.elrepo.noarch.rpm`
-  - CentOS 8: `dnf install https://www.elrepo.org/elrepo-release-8.el8.elrepo.noarch.rpm`
-- Install packages: `yum/dnf install vitastor lpsolve etcd kernel-ml qemu-kvm`
-
-### Building from Source
-
-- Install Linux kernel 5.4 or newer, for io_uring support. 5.8 or later is highly recommended because
-  there is at least one known io_uring hang with 5.4 and an HP SmartArray controller.
-- Install liburing 0.4 or newer and its headers.
-- Install lp_solve.
-- Install etcd, at least version 3.4.15. Earlier versions won't work because of various bugs,
-  for example [#12402](https://github.com/etcd-io/etcd/pull/12402). You can also take 3.4.13
-  with this specific fix from here: https://github.com/vitalif/etcd/, branch release-3.4.
-- Install node.js 10 or newer.
-- Install gcc and g++ 8.x or newer.
-- Clone https://yourcmc.ru/git/vitalif/vitastor/ with submodules.
-- Install QEMU 3.0+, get its source, begin to build it, stop the build and copy headers:
-   - `<qemu>/include` &rarr; `<vitastor>/qemu/include`
-   - Debian:
-      * Use qemu packages from the main repository
-      * `<qemu>/b/qemu/config-host.h` &rarr; `<vitastor>/qemu/b/qemu/config-host.h`
-      * `<qemu>/b/qemu/qapi` &rarr; `<vitastor>/qemu/b/qemu/qapi`
-   - CentOS 8:
-      * Use qemu packages from the Advanced-Virtualization repository. To enable it, run
-        `yum install centos-release-advanced-virtualization.noarch` and then `yum install qemu`
-      * `<qemu>/config-host.h` &rarr; `<vitastor>/qemu/b/qemu/config-host.h`
-      * For QEMU 3.0+: `<qemu>/qapi` &rarr; `<vitastor>/qemu/b/qemu/qapi`
-      * For QEMU 2.0+: `<qemu>/qapi-types.h` &rarr; `<vitastor>/qemu/b/qemu/qapi-types.h`
-   - `config-host.h` and `qapi` are required because they contain generated headers
-- You can also rebuild QEMU with a patch that makes LD_PRELOAD unnecessary to load vitastor driver.
-  See `patches/qemu-*.*-vitastor.patch`.
-- Install fio 3.7 or later, get its source and symlink it into `<vitastor>/fio`.
-- Build & install Vitastor with `mkdir build && cd build && cmake .. && make -j8 && make install`.
-  Pay attention to the `QEMU_PLUGINDIR` cmake option - it must be set to `qemu-kvm` on RHEL.
-
-## Running
-
-Please note that startup procedure isn't currently simple - you specify configuration
-and calculate disk offsets almost by hand. This will be fixed in near future.
-
-- Get some SATA or NVMe SSDs with capacitors (server-grade drives). You can use desktop SSDs
-  with lazy fsync, but prepare for inferior single-thread latency.
-- Get a fast network (at least 10 Gbit/s).
-- Disable CPU powersaving: `cpupower idle-set -D 0 && cpupower frequency-set -g performance`.
-- Check `/usr/lib/vitastor/mon/make-units.sh` and `/usr/lib/vitastor/mon/make-osd.sh` and
-  put desired values into the variables at the top of these files.
-- Create systemd units for the monitor and etcd: `/usr/lib/vitastor/mon/make-units.sh`
-- Create systemd units for your OSDs: `/usr/lib/vitastor/mon/make-osd.sh /dev/disk/by-partuuid/XXX [/dev/disk/by-partuuid/YYY ...]`
-- You can edit the units and change OSD configuration. Notable configuration variables:
-  - `disable_data_fsync 1` - only safe with server-grade drives with capacitors.
-  - `immediate_commit all` - use this if all your drives are server-grade.
-  - `disable_device_lock 1` - only required if you run multiple OSDs on one block device.
-  - `flusher_count 256` - flusher is a micro-thread that removes old data from the journal.
-    You don't have to worry about this parameter anymore, 256 is enough.
-  - `disk_alignment`, `journal_block_size`, `meta_block_size` should be set to the internal
-    block size of your SSDs which is 4096 on most drives.
-  - `journal_no_same_sector_overwrites true` prevents multiple overwrites of the same journal sector.
-    Most (99%) SSDs don't need this option. But Intel D3-4510 does because it doesn't like when you
-    overwrite the same sector twice in a short period of time. The setting forces Vitastor to never
-    overwrite the same journal sector twice in a row which makes D3-4510 almost happy. Not totally
-    happy, because overwrites of the same block can still happen in the metadata area... When this
-    setting is set, it is also required to raise `journal_sector_buffer_count` setting, which is the
-    number of dirty journal sectors that may be written to at the same time.
-- `systemctl start vitastor.target` everywhere.
-- Create global configuration in etcd: `etcdctl --endpoints=... put /vitastor/config/global '{"immediate_commit":"all"}'`
-  (if all your drives have capacitors).
-- Create pool configuration in etcd: `etcdctl --endpoints=... put /vitastor/config/pools '{"1":{"name":"testpool","scheme":"replicated","pg_size":2,"pg_minsize":1,"pg_count":256,"failure_domain":"host"}}'`.
-  For jerasure pools the configuration should look like the following: `2:{"name":"ecpool","scheme":"jerasure","pg_size":4,"parity_chunks":2,"pg_minsize":2,"pg_count":256,"failure_domain":"host"}`.
-- At this point, one of the monitors will configure PGs and OSDs will start them.
-- You can check PG states with `etcdctl --endpoints=... get --prefix /vitastor/pg/state`. All PGs should become 'active'.
-
-### Name an image
-
-```
-etcdctl --endpoints=<etcd> put /vitastor/config/inode/<pool>/<inode> '{"name":"<name>","size":<size>[,"parent_id":<parent_inode_number>][,"readonly":true]}'
-```
-
-For example:
-
-```
-etcdctl --endpoints=http://10.115.0.10:2379/v3 put /vitastor/config/inode/1/1 '{"name":"testimg","size":2147483648}'
-```
-
-If you specify parent_id the image becomes a CoW clone. I.e. all writes go to the new inode and reads first check it
-and then upper layers. You can then make parent readonly by updating its entry with `"readonly":true` for safety and
-basically treat it as a snapshot.
-
-So to create a snapshot you basically rename the previous upper layer (for example from testimg to testimg@0), make it readonly
-and create a new top layer with the original name (testimg) and the previous one as a parent.
-
-### Run fio benchmarks
-
-fio command example:
-
-```
-fio -thread -ioengine=libfio_vitastor.so -name=test -bs=4M -direct=1 -iodepth=16 -rw=write -etcd=10.115.0.10:2379/v3 -image=testimg
-```
-
-If you don't want to access your image by name, you can specify pool number, inode number and size
-(`-pool=1 -inode=1 -size=400G`) instead of the image name (`-image=testimg`).
-
-### Upload VM image
-
-Use qemu-img and `vitastor:etcd_host=<HOST>:image=<IMAGE>` disk filename. For example:
-
-```
-qemu-img convert -f qcow2 debian10.qcow2 -p -O raw 'vitastor:etcd_host=10.115.0.10\:2379/v3:image=testimg'
-```
-
-Note that the command requires to be run with `LD_PRELOAD=/usr/lib/x86_64-linux-gnu/qemu/block-vitastor.so qemu-img ...`
-if you use unmodified QEMU.
-
-You can also specify `:pool=<POOL>:inode=<INODE>:size=<SIZE>` instead of `:image=<IMAGE>`
-if you don't want to use inode metadata.
-
-### Start a VM
-
-Run QEMU with `-drive file=vitastor:etcd_host=<HOST>:image=<IMAGE>` and use 4 KB physical block size.
-
-For example:
-
-```
-qemu-system-x86_64 -enable-kvm -m 1024
-  -drive 'file=vitastor:etcd_host=10.115.0.10\:2379/v3:image=testimg',format=raw,if=none,id=drive-virtio-disk0,cache=none
-  -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1,write-cache=off,physical_block_size=4096,logical_block_size=512
-  -vnc 0.0.0.0:0
-```
-
-You can also specify `:pool=<POOL>:inode=<INODE>:size=<SIZE>` instead of `:image=<IMAGE>`,
-just like in qemu-img.
-
-### Remove inode
-
-Use vitastor-rm. For example:
-
-```
-vitastor-rm --etcd_address 10.115.0.10:2379/v3 --pool 1 --inode 1 --parallel_osds 16 --iodepth 32
-```
-
-### NBD
-
-To create a local block device for a Vitastor image, use NBD. For example:
-
-```
-vitastor-nbd map --etcd_address 10.115.0.10:2379/v3 --image testimg
-```
-
-It will output the device name, like /dev/nbd0 which you can then format and mount as a normal block device.
-
-Again, you can use `--pool <POOL> --inode <INODE> --size <SIZE>` insteaf of `--image <IMAGE>` if you want.
-
-### Kubernetes
-
-Vitastor has a CSI plugin for Kubernetes which supports RWO volumes.
-
-To deploy it, take manifests from [csi/deploy/](csi/deploy/) directory, put your
-Vitastor configuration in [csi/deploy/001-csi-config-map.yaml](001-csi-config-map.yaml),
-configure storage class in [csi/deploy/009-storage-class.yaml](009-storage-class.yaml)
-and apply all `NNN-*.yaml` manifests to your Kubernetes installation:
-
-```
-for i in ./???-*.yaml; do kubectl apply -f $i; done
-```
-
-After that you'll be able to create PersistentVolumes. See example in [csi/deploy/example-pvc.yaml](csi/deploy/example-pvc.yaml).
-
-## Known Problems
-
-- Object deletion requests may currently lead to 'incomplete' objects in EC pools
-  if your OSDs crash during deletion because proper handling of object cleanup
-  in a cluster should be "three-phase" and it's currently not implemented.
-  Just repeat the removal request again in this case.
-
-## Implementation Principles
-
-- I like architecturally simple solutions. Vitastor is and will always be designed
-  exactly like that.
-- I also like reinventing the wheel to some extent, like writing my own HTTP client
-  for etcd interaction instead of using prebuilt libraries, because in this case
-  I'm confident about what my code does and what it doesn't do.
-- I don't care about C++ "best practices" like RAII or proper inheritance or usage of
-  smart pointers or whatever and I don't intend to change my mind, so if you're here
-  looking for ideal reference C++ code, this probably isn't the right place.
-- I like node.js better than any other dynamically-typed language interpreter
-  because it's faster than any other interpreter in the world, has neutral C-like
-  syntax and built-in event loop. That's why Monitor is implemented in node.js.
-
-## Author and License
-
-Copyright (c) Vitaliy Filippov (vitalif [at] yourcmc.ru), 2019+
-
-Join Vitastor Telegram Chat: https://t.me/vitastor
-
-All server-side code (OSD, Monitor and so on) is licensed under the terms of
-Vitastor Network Public License 1.1 (VNPL 1.1), a copyleft license based on
-GNU GPLv3.0 with the additional "Network Interaction" clause which requires
-opensourcing all programs directly or indirectly interacting with Vitastor
-through a computer network and expressly designed to be used in conjunction
-with it ("Proxy Programs"). Proxy Programs may be made public not only under
-the terms of the same license, but also under the terms of any GPL-Compatible
-Free Software License, as listed by the Free Software Foundation.
-This is a stricter copyleft license than the Affero GPL.
-
-Please note that VNPL doesn't require you to open the code of proprietary
-software running inside a VM if it's not specially designed to be used with
-Vitastor.
-
-Basically, you can't use the software in a proprietary environment to provide
-its functionality to users without opensourcing all intermediary components
-standing between the user and Vitastor or purchasing a commercial license
-from the author 😀.
-
-Client libraries (cluster_client and so on) are dual-licensed under the same
-VNPL 1.1 and also GNU GPL 2.0 or later to allow for compatibility with GPLed
-software like QEMU and fio.
-
-You can find the full text of VNPL-1.1 in the file [VNPL-1.1.txt](VNPL-1.1.txt).
-GPL 2.0 is also included in this repository as [GPL-2.0.txt](GPL-2.0.txt).

VNPL-1.1.txt

@@ -1,648 +0,0 @@
-                     VITASTOR NETWORK PUBLIC LICENSE
-                     Version 1.1,  6 February 2021
-
- Copyright (C) 2021 Vitaliy Filippov <vitalif@yourcmc.ru>
- Everyone is permitted to copy and distribute verbatim copies
- of this license document, but changing it is not allowed.
-
-                            Preamble
-
-  The Vitastor Network Public License is a free, copyleft license for
-software and other kinds of works, specifically designed to ensure
-cooperation with the community in the case of network server software.
-
-  The licenses for most software and other practical works are designed
-to take away your freedom to share and change the works.  By contrast,
-GNU General Public Licenses and Vitastor Network Public License are
-intended to guarantee your freedom to share and change all versions
-of a program--to make sure it remains free software for all its users.
-
-  When we speak of free software, we are referring to freedom, not
-price.  GNU General Public Licenses and Vitastor Network Public License
-are designed to make sure that you have the freedom to distribute copies
-of free software (and charge for them if you wish), that you receive
-source code or can get it if you want it, that you can change the software
-or use pieces of it in new free programs, and that you know you can do these
-things.
-
-  Developers that use GNU General Public Licenses and Vitastor
-Network Public License protect your rights with two steps:
-(1) assert copyright on the software, and (2) offer
-you this License which gives you legal permission to copy, distribute
-and/or modify the software.
-
-  A secondary benefit of defending all users' freedom is that
-improvements made in alternate versions of the program, if they
-receive widespread use, become available for other developers to
-incorporate.  Many developers of free software are heartened and
-encouraged by the resulting cooperation.  However, in the case of
-software used on network servers, this result may fail to come about.
-The GNU General Public License permits making a modified version and
-letting the public access it on a server without ever releasing its
-source code to the public. Even the GNU Affero General Public License
-permits running a modified version in a closed environment where
-public users only interact with it through a closed-source proxy, again,
-without making the program and the proxy available to the public
-for free.
-
-  The Vitastor Network Public License is designed specifically to
-ensure that, in such cases, the modified program and the proxy stays
-available to the community. It requires the operator of a network server to
-provide the source code of the original program and all other programs
-communicating with it running there to the users of that server.
-Therefore, public use of a modified version, on a server accessible
-directly or indirectly to the public, gives the public access to the source
-code of the modified version.
-
-  The precise terms and conditions for copying, distribution and
-modification follow.
-
-                       TERMS AND CONDITIONS
-
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-
-  "This License" refers to version 1 of the Vitastor Network Public License.
-
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-
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allocator.cpp

@@ -1,6 +1,3 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 (see README.md for details)
-
 #include <stdexcept>
 #include "allocator.h"
 
@@ -13,19 +10,19 @@ allocator::allocator(uint64_t blocks)
     {
         throw std::invalid_argument("blocks");
     }
-    uint64_t p2 = 1;
-    total = 0;
+    uint64_t p2 = 1, total = 1;
     while (p2 * 64 < blocks)
     {
-        total += p2;
         p2 = p2 * 64;
+        total += p2;
     }
+    total -= p2;
     total += (blocks+63) / 64;
-    mask = new uint64_t[total];
+    mask = new uint64_t[2 + total];
     size = free = blocks;
     last_one_mask = (blocks % 64) == 0
         ? UINT64_MAX
-        : ((1l << (blocks % 64)) - 1);
+        : ~(UINT64_MAX << (64 - blocks % 64));
     for (uint64_t i = 0; i < total; i++)
     {
         mask[i] = 0;
@@ -37,21 +34,6 @@ allocator::~allocator()
     delete[] mask;
 }
 
-bool allocator::get(uint64_t addr)
-{
-    if (addr >= size)
-    {
-        return false;
-    }
-    uint64_t p2 = 1, offset = 0;
-    while (p2 * 64 < size)
-    {
-        offset += p2;
-        p2 = p2 * 64;
-    }
-    return ((mask[offset + addr/64] >> (addr % 64)) & 1);
-}
-
 void allocator::set(uint64_t addr, bool value)
 {
     if (addr >= size)
@@ -114,10 +96,6 @@ uint64_t allocator::find_free()
     uint64_t p2 = 1, offset = 0, addr = 0, f, i;
     while (p2 < size)
     {
-        if (offset+addr >= total)
-        {
-            return UINT64_MAX;
-        }
         uint64_t m = mask[offset + addr];
         for (i = 0, f = 1; i < 64; i++, f <<= 1)
         {
@@ -132,6 +110,11 @@ uint64_t allocator::find_free()
             return UINT64_MAX;
         }
         addr = (addr * 64) | i;
+        if (addr >= size)
+        {
+            // No space
+            return UINT64_MAX;
+        }
         offset += p2;
         p2 = p2 * 64;
     }
@@ -142,35 +125,3 @@ uint64_t allocator::get_free_count()
 {
     return free;
 }
-
-void bitmap_set(void *bitmap, uint64_t start, uint64_t len, uint64_t bitmap_granularity)
-{
-    if (start == 0)
-    {
-        if (len == 32*bitmap_granularity)
-        {
-            *((uint32_t*)bitmap) = UINT32_MAX;
-            return;
-        }
-        else if (len == 64*bitmap_granularity)
-        {
-            *((uint64_t*)bitmap) = UINT64_MAX;
-            return;
-        }
-    }
-    unsigned bit_start = start / bitmap_granularity;
-    unsigned bit_end = ((start + len) + bitmap_granularity - 1) / bitmap_granularity;
-    while (bit_start < bit_end)
-    {
-        if (!(bit_start & 7) && bit_end >= bit_start+8)
-        {
-            ((uint8_t*)bitmap)[bit_start / 8] = UINT8_MAX;
-            bit_start += 8;
-        }
-        else
-        {
-            ((uint8_t*)bitmap)[bit_start / 8] |= 1 << (bit_start % 8);
-            bit_start++;
-        }
-    }
-}

allocator.h

@@ -1,6 +1,3 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 (see README.md for details)
-
 #pragma once
 
 #include <stdint.h>
@@ -8,7 +5,6 @@
 // Hierarchical bitmap allocator
 class allocator
 {
-    uint64_t total;
     uint64_t size;
     uint64_t free;
     uint64_t last_one_mask;
@@ -16,10 +12,7 @@ class allocator
 public:
     allocator(uint64_t blocks);
     ~allocator();
-    bool get(uint64_t addr);
     void set(uint64_t addr, bool value);
     uint64_t find_free();
     uint64_t get_free_count();
 };
-
-void bitmap_set(void *bitmap, uint64_t start, uint64_t len, uint64_t bitmap_granularity);

base64.cpp

@@ -1,6 +1,3 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 (see README.md for details)
-
 #include "base64.h"
 
 std::string base64_encode(const std::string &in)

base64.h

@@ -1,6 +1,3 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 (see README.md for details)
-
 #pragma once
 #include <string>
 

blockstore.cpp

@@ -1,11 +1,8 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 (see README.md for details)
-
 #include "blockstore_impl.h"
 
-blockstore_t::blockstore_t(blockstore_config_t & config, ring_loop_t *ringloop, timerfd_manager_t *tfd)
+blockstore_t::blockstore_t(blockstore_config_t & config, ring_loop_t *ringloop)
 {
-    impl = new blockstore_impl_t(config, ringloop, tfd);
+    impl = new blockstore_impl_t(config, ringloop);
 }
 
 blockstore_t::~blockstore_t()
@@ -35,17 +32,17 @@ bool blockstore_t::is_safe_to_stop()
 
 void blockstore_t::enqueue_op(blockstore_op_t *op)
 {
-    impl->enqueue_op(op);
+    impl->enqueue_op(op, false);
 }
 
-int blockstore_t::read_bitmap(object_id oid, uint64_t target_version, void *bitmap, uint64_t *result_version)
+void blockstore_t::enqueue_op_first(blockstore_op_t *op)
 {
-    return impl->read_bitmap(oid, target_version, bitmap, result_version);
+    impl->enqueue_op(op, true);
 }
 
-std::map<uint64_t, uint64_t> & blockstore_t::get_inode_space_stats()
+std::unordered_map<object_id, uint64_t> & blockstore_t::get_unstable_writes()
 {
-    return impl->inode_space_stats;
+    return impl->unstable_writes;
 }
 
 uint32_t blockstore_t::get_block_size()
@@ -63,7 +60,7 @@ uint64_t blockstore_t::get_free_block_count()
     return impl->get_free_block_count();
 }
 
-uint32_t blockstore_t::get_bitmap_granularity()
+uint32_t blockstore_t::get_disk_alignment()
 {
-    return impl->get_bitmap_granularity();
+    return impl->get_disk_alignment();
 }

blockstore.h

@@ -1,6 +1,3 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 (see README.md for details)
-
 #pragma once
 
 #ifndef _LARGEFILE64_SOURCE
@@ -9,14 +6,12 @@
 
 #include <stdint.h>
 
-#include <string>
 #include <map>
 #include <unordered_map>
 #include <functional>
 
 #include "object_id.h"
 #include "ringloop.h"
-#include "timerfd_manager.h"
 
 // Memory alignment for direct I/O (usually 512 bytes)
 // All other alignments must be a multiple of this one
@@ -28,19 +23,17 @@
 #define DEFAULT_ORDER 17
 #define MIN_BLOCK_SIZE 4*1024
 #define MAX_BLOCK_SIZE 128*1024*1024
-#define DEFAULT_BITMAP_GRANULARITY 4096
 
 #define BS_OP_MIN 1
 #define BS_OP_READ 1
 #define BS_OP_WRITE 2
-#define BS_OP_WRITE_STABLE 3
-#define BS_OP_SYNC 4
-#define BS_OP_STABLE 5
-#define BS_OP_DELETE 6
-#define BS_OP_LIST 7
-#define BS_OP_ROLLBACK 8
-#define BS_OP_SYNC_STAB_ALL 9
-#define BS_OP_MAX 9
+#define BS_OP_SYNC 3
+#define BS_OP_STABLE 4
+#define BS_OP_DELETE 5
+#define BS_OP_LIST 6
+#define BS_OP_ROLLBACK 7
+#define BS_OP_SYNC_STAB_ALL 8
+#define BS_OP_MAX 8
 
 #define BS_OP_PRIVATE_DATA_SIZE 256
 
@@ -48,9 +41,9 @@
 
 Blockstore opcode documentation:
 
-## BS_OP_READ / BS_OP_WRITE / BS_OP_WRITE_STABLE
+## BS_OP_READ / BS_OP_WRITE
 
-Read or write object data. WRITE_STABLE writes a version that doesn't require marking as stable.
+Read or write object data.
 
 Input:
 - oid = requested object
@@ -66,8 +59,6 @@ Input:
 - offset, len = offset and length within object. length may be zero, in that case
   read operation only returns the version / write operation only bumps the version
 - buf = pre-allocated buffer for data (read) / with data (write). may be NULL if len == 0.
-- bitmap = pointer to the new 'external' object bitmap data. Its part which is respective to the
-  write request is copied into the metadata area bitwise and stored there.
 
 Output:
 - retval = number of bytes actually read/written or negative error number (-EINVAL or -ENOSPC)
@@ -122,8 +113,6 @@ Input:
 - oid.stripe = PG alignment
 - len = PG count or 0 to list all objects
 - offset = PG number
-- oid.inode = min inode number or 0 to list all inodes
-- version = max inode number or 0 to list all inodes
 
 Output:
 - retval = total obj_ver_id count
@@ -145,7 +134,6 @@ struct blockstore_op_t
     uint32_t offset;
     uint32_t len;
     void *buf;
-    void *bitmap;
     int retval;
 
     uint8_t private_data[BS_OP_PRIVATE_DATA_SIZE];
@@ -159,7 +147,7 @@ class blockstore_t
 {
     blockstore_impl_t *impl;
 public:
-    blockstore_t(blockstore_config_t & config, ring_loop_t *ringloop, timerfd_manager_t *tfd);
+    blockstore_t(blockstore_config_t & config, ring_loop_t *ringloop);
     ~blockstore_t();
 
     // Event loop
@@ -180,16 +168,17 @@ public:
     // Submission
     void enqueue_op(blockstore_op_t *op);
 
-    // Simplified synchronous operation: get object bitmap & current version
-    int read_bitmap(object_id oid, uint64_t target_version, void *bitmap, uint64_t *result_version = NULL);
+    // Insert operation into the beginning of the queue
+    // Intended for the OSD syncer "thread" to be able to stabilize something when the journal is full
+    void enqueue_op_first(blockstore_op_t *op);
 
-    // Get per-inode space usage statistics
-    std::map<uint64_t, uint64_t> & get_inode_space_stats();
+    // Unstable writes are added here (map of object_id -> version)
+    std::unordered_map<object_id, uint64_t> & get_unstable_writes();
 
     // FIXME rename to object_size
     uint32_t get_block_size();
     uint64_t get_block_count();
     uint64_t get_free_block_count();
 
-    uint32_t get_bitmap_granularity();
+    uint32_t get_disk_alignment();
 };

blockstore_flush.cpp

@@ -1,27 +1,18 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 (see README.md for details)
-
 #include "blockstore_impl.h"
 
-journal_flusher_t::journal_flusher_t(blockstore_impl_t *bs)
+journal_flusher_t::journal_flusher_t(int flusher_count, blockstore_impl_t *bs)
 {
     this->bs = bs;
-    this->max_flusher_count = bs->max_flusher_count;
-    this->min_flusher_count = bs->min_flusher_count;
-    this->cur_flusher_count = bs->min_flusher_count;
-    this->target_flusher_count = bs->min_flusher_count;
+    this->flusher_count = flusher_count;
     dequeuing = false;
-    trimming = false;
     active_flushers = 0;
     syncing_flushers = 0;
-    // FIXME: allow to configure flusher_start_threshold and journal_trim_interval
     flusher_start_threshold = bs->journal_block_size / sizeof(journal_entry_stable);
-    journal_trim_interval = 512;
-    journal_trim_counter = bs->journal.flush_journal ? 1 : 0;
-    trim_wanted = bs->journal.flush_journal ? 1 : 0;
-    journal_superblock = bs->journal.inmemory ? bs->journal.buffer : memalign_or_die(MEM_ALIGNMENT, bs->journal_block_size);
-    co = new journal_flusher_co[max_flusher_count];
-    for (int i = 0; i < max_flusher_count; i++)
+    journal_trim_interval = flusher_start_threshold;
+    journal_trim_counter = 0;
+    journal_superblock = bs->journal.inmemory ? bs->journal.buffer : memalign(MEM_ALIGNMENT, bs->journal_block_size);
+    co = new journal_flusher_co[flusher_count];
+    for (int i = 0; i < flusher_count; i++)
     {
         co[i].bs = bs;
         co[i].flusher = this;
@@ -71,31 +62,14 @@ bool journal_flusher_t::is_active()
 
 void journal_flusher_t::loop()
 {
-    target_flusher_count = bs->write_iodepth*2;
-    if (target_flusher_count < min_flusher_count)
-        target_flusher_count = min_flusher_count;
-    else if (target_flusher_count > max_flusher_count)
-        target_flusher_count = max_flusher_count;
-    if (target_flusher_count > cur_flusher_count)
-        cur_flusher_count = target_flusher_count;
-    else if (target_flusher_count < cur_flusher_count)
+    for (int i = 0; (active_flushers > 0 || dequeuing) && i < flusher_count; i++)
     {
-        while (target_flusher_count < cur_flusher_count)
-        {
-            if (co[cur_flusher_count-1].wait_state)
-                break;
-            cur_flusher_count--;
-        }
-    }
-    for (int i = 0; (active_flushers > 0 || dequeuing) && i < cur_flusher_count; i++)
         co[i].loop();
+    }
 }
 
 void journal_flusher_t::enqueue_flush(obj_ver_id ov)
 {
-#ifdef BLOCKSTORE_DEBUG
-    printf("enqueue_flush %lx:%lx v%lu\n", ov.oid.inode, ov.oid.stripe, ov.version);
-#endif
     auto it = flush_versions.find(ov.oid);
     if (it != flush_versions.end())
     {
@@ -107,18 +81,15 @@ void journal_flusher_t::enqueue_flush(obj_ver_id ov)
         flush_versions[ov.oid] = ov.version;
         flush_queue.push_back(ov.oid);
     }
-    if (!dequeuing && (flush_queue.size() >= flusher_start_threshold || trim_wanted > 0))
+    if (!dequeuing && flush_queue.size() >= flusher_start_threshold)
     {
         dequeuing = true;
         bs->ringloop->wakeup();
     }
 }
 
-void journal_flusher_t::unshift_flush(obj_ver_id ov, bool force)
+void journal_flusher_t::unshift_flush(obj_ver_id ov)
 {
-#ifdef BLOCKSTORE_DEBUG
-    printf("unshift_flush %lx:%lx v%lu\n", ov.oid.inode, ov.oid.stripe, ov.version);
-#endif
     auto it = flush_versions.find(ov.oid);
     if (it != flush_versions.end())
     {
@@ -128,38 +99,15 @@ void journal_flusher_t::unshift_flush(obj_ver_id ov, bool force)
     else
     {
         flush_versions[ov.oid] = ov.version;
-        if (!force)
-            flush_queue.push_front(ov.oid);
-    }
-    if (force)
         flush_queue.push_front(ov.oid);
-    if (force || !dequeuing && (flush_queue.size() >= flusher_start_threshold || trim_wanted > 0))
+    }
+    if (!dequeuing && flush_queue.size() >= flusher_start_threshold)
     {
         dequeuing = true;
         bs->ringloop->wakeup();
     }
 }
 
-void journal_flusher_t::remove_flush(object_id oid)
-{
-#ifdef BLOCKSTORE_DEBUG
-    printf("undo_flush %lx:%lx\n", oid.inode, oid.stripe);
-#endif
-    auto v_it = flush_versions.find(oid);
-    if (v_it != flush_versions.end())
-    {
-        flush_versions.erase(v_it);
-        for (auto q_it = flush_queue.begin(); q_it != flush_queue.end(); q_it++)
-        {
-            if (*q_it == oid)
-            {
-                flush_queue.erase(q_it);
-                break;
-            }
-        }
-    }
-}
-
 void journal_flusher_t::request_trim()
 {
     dequeuing = true;
@@ -167,16 +115,6 @@ void journal_flusher_t::request_trim()
     bs->ringloop->wakeup();
 }
 
-void journal_flusher_t::mark_trim_possible()
-{
-    if (trim_wanted > 0)
-    {
-        dequeuing = true;
-        journal_trim_counter++;
-        bs->ringloop->wakeup();
-    }
-}
-
 void journal_flusher_t::release_trim()
 {
     trim_wanted--;
@@ -231,23 +169,9 @@ bool journal_flusher_co::loop()
         goto resume_17;
     else if (wait_state == 18)
         goto resume_18;
-    else if (wait_state == 19)
-        goto resume_19;
-    else if (wait_state == 20)
-        goto resume_20;
-    else if (wait_state == 21)
-        goto resume_21;
 resume_0:
-    if (flusher->flush_queue.size() < flusher->min_flusher_count && !flusher->trim_wanted ||
-        !flusher->flush_queue.size() || !flusher->dequeuing)
+    if (!flusher->flush_queue.size() || !flusher->dequeuing)
     {
-stop_flusher:
-        if (flusher->trim_wanted > 0 && flusher->journal_trim_counter > 0)
-        {
-            // Attempt forced trim
-            flusher->active_flushers++;
-            goto trim_journal;
-        }
         flusher->dequeuing = false;
         wait_state = 0;
         return true;
@@ -259,23 +183,6 @@ stop_flusher:
     dirty_end = bs->dirty_db.find(cur);
     if (dirty_end != bs->dirty_db.end())
     {
-        repeat_it = flusher->sync_to_repeat.find(cur.oid);
-        if (repeat_it != flusher->sync_to_repeat.end())
-        {
-#ifdef BLOCKSTORE_DEBUG
-            printf("Postpone %lx:%lx v%lu\n", cur.oid.inode, cur.oid.stripe, cur.version);
-#endif
-            // We don't flush different parts of history of the same object in parallel
-            // So we check if someone is already flushing this object
-            // In that case we set sync_to_repeat and pick another object
-            // Another coroutine will see it and re-queue the object after it finishes
-            if (repeat_it->second < cur.version)
-                repeat_it->second = cur.version;
-            wait_state = 0;
-            goto resume_0;
-        }
-        else
-            flusher->sync_to_repeat[cur.oid] = 0;
         if (dirty_end->second.journal_sector >= bs->journal.dirty_start &&
             (bs->journal.dirty_start >= bs->journal.used_start ||
             dirty_end->second.journal_sector < bs->journal.used_start))
@@ -306,7 +213,6 @@ stop_flusher:
             if (!found)
             {
                 // Try other objects
-                flusher->sync_to_repeat.erase(cur.oid);
                 int search_left = flusher->flush_queue.size() - 1;
 #ifdef BLOCKSTORE_DEBUG
                 printf("Flusher overran writers (dirty_start=%08lx) - searching for older flushes (%d left)\n", bs->journal.dirty_start, search_left);
@@ -325,18 +231,13 @@ stop_flusher:
                             dirty_end->second.journal_sector < bs->journal.used_start))
                         {
 #ifdef BLOCKSTORE_DEBUG
-                            printf("Write %lx:%lx v%lu is too new: offset=%08lx\n", cur.oid.inode, cur.oid.stripe, cur.version, dirty_end->second.journal_sector);
+                            printf("Write %lu:%lu v%lu is too new: offset=%08lx\n", cur.oid.inode, cur.oid.stripe, cur.version, dirty_end->second.journal_sector);
 #endif
                             flusher->enqueue_flush(cur);
                         }
                         else
                         {
-                            repeat_it = flusher->sync_to_repeat.find(cur.oid);
-                            if (repeat_it == flusher->sync_to_repeat.end())
-                            {
-                                flusher->sync_to_repeat[cur.oid] = 0;
-                                break;
-                            }
+                            break;
                         }
                     }
                     search_left--;
@@ -346,12 +247,31 @@ stop_flusher:
 #ifdef BLOCKSTORE_DEBUG
                     printf("No older flushes, stopping\n");
 #endif
-                    goto stop_flusher;
+                    flusher->dequeuing = false;
+                    wait_state = 0;
+                    return true;
                 }
             }
         }
+        repeat_it = flusher->sync_to_repeat.find(cur.oid);
+        if (repeat_it != flusher->sync_to_repeat.end())
+        {
 #ifdef BLOCKSTORE_DEBUG
-        printf("Flushing %lx:%lx v%lu\n", cur.oid.inode, cur.oid.stripe, cur.version);
+            printf("Postpone %lu:%lu v%lu\n", cur.oid.inode, cur.oid.stripe, cur.version);
+#endif
+            // We don't flush different parts of history of the same object in parallel
+            // So we check if someone is already flushing this object
+            // In that case we set sync_to_repeat and pick another object
+            // Another coroutine will see it and re-queue the object after it finishes
+            if (repeat_it->second < cur.version)
+                repeat_it->second = cur.version;
+            wait_state = 0;
+            goto resume_0;
+        }
+        else
+            flusher->sync_to_repeat[cur.oid] = 0;
+#ifdef BLOCKSTORE_DEBUG
+        printf("Flushing %lu:%lu v%lu\n", cur.oid.inode, cur.oid.stripe, cur.version);
 #endif
         flusher->active_flushers++;
 resume_1:
@@ -365,12 +285,12 @@ resume_1:
             return false;
         }
         // Writes and deletes shouldn't happen at the same time
-        assert(!has_writes || !has_delete);
-        if (!has_writes && !has_delete || has_delete && old_clean_loc == UINT64_MAX)
+        assert(!(copy_count > 0 || has_writes) || !has_delete);
+        if (copy_count == 0 && !has_writes && !has_delete || has_delete && old_clean_loc == UINT64_MAX)
         {
             // Nothing to flush
             bs->erase_dirty(dirty_start, std::next(dirty_end), clean_loc);
-            goto release_oid;
+            goto trim_journal;
         }
         if (clean_loc == UINT64_MAX)
         {
@@ -379,7 +299,7 @@ resume_1:
                 // Object not allocated. This is a bug.
                 char err[1024];
                 snprintf(
-                    err, 1024, "BUG: Object %lx:%lx v%lu that we are trying to flush is not allocated on the data device",
+                    err, 1024, "BUG: Object %lu:%lu v%lu that we are trying to flush is not allocated on the data device",
                     cur.oid.inode, cur.oid.stripe, cur.version
                 );
                 throw std::runtime_error(err);
@@ -428,18 +348,18 @@ resume_1:
         {
             new_clean_bitmap = (bs->inmemory_meta
                 ? meta_new.buf + meta_new.pos*bs->clean_entry_size + sizeof(clean_disk_entry)
-                : bs->clean_bitmap + (clean_loc >> bs->block_order)*(2*bs->clean_entry_bitmap_size));
+                : bs->clean_bitmap + (clean_loc >> bs->block_order)*bs->clean_entry_bitmap_size);
             if (clean_init_bitmap)
             {
                 memset(new_clean_bitmap, 0, bs->clean_entry_bitmap_size);
-                bitmap_set(new_clean_bitmap, clean_bitmap_offset, clean_bitmap_len, bs->bitmap_granularity);
+                bitmap_set(new_clean_bitmap, clean_bitmap_offset, clean_bitmap_len);
             }
         }
         for (it = v.begin(); it != v.end(); it++)
         {
             if (new_clean_bitmap)
             {
-                bitmap_set(new_clean_bitmap, it->offset, it->len, bs->bitmap_granularity);
+                bitmap_set(new_clean_bitmap, it->offset, it->len);
             }
             await_sqe(4);
             data->iov = (struct iovec){ it->buf, (size_t)it->len };
@@ -473,7 +393,6 @@ resume_1:
                 wait_state = 5;
                 return false;
             }
-            // zero out old metadata entry
             memset(meta_old.buf + meta_old.pos*bs->clean_entry_size, 0, bs->clean_entry_size);
             await_sqe(15);
             data->iov = (struct iovec){ meta_old.buf, bs->meta_block_size };
@@ -485,37 +404,18 @@ resume_1:
         }
         if (has_delete)
         {
-            clean_disk_entry *new_entry = (clean_disk_entry*)(meta_new.buf + meta_new.pos*bs->clean_entry_size);
-            if (new_entry->oid.inode != 0 && new_entry->oid != cur.oid)
-            {
-                printf("Fatal error (metadata corruption or bug): tried to delete metadata entry %lu (%lx:%lx) while deleting %lx:%lx\n",
-                    clean_loc >> bs->block_order, new_entry->oid.inode, new_entry->oid.stripe, cur.oid.inode, cur.oid.stripe);
-                exit(1);
-            }
-            // zero out new metadata entry
             memset(meta_new.buf + meta_new.pos*bs->clean_entry_size, 0, bs->clean_entry_size);
         }
         else
         {
             clean_disk_entry *new_entry = (clean_disk_entry*)(meta_new.buf + meta_new.pos*bs->clean_entry_size);
-            if (new_entry->oid.inode != 0 && new_entry->oid != cur.oid)
-            {
-                printf("Fatal error (metadata corruption or bug): tried to overwrite non-zero metadata entry %lu (%lx:%lx) with %lx:%lx\n",
-                    clean_loc >> bs->block_order, new_entry->oid.inode, new_entry->oid.stripe, cur.oid.inode, cur.oid.stripe);
-                exit(1);
-            }
+            assert(new_entry->oid.inode == 0 || new_entry->oid == cur.oid);
             new_entry->oid = cur.oid;
             new_entry->version = cur.version;
             if (!bs->inmemory_meta)
             {
                 memcpy(&new_entry->bitmap, new_clean_bitmap, bs->clean_entry_bitmap_size);
             }
-            // copy latest external bitmap/attributes
-            if (bs->clean_entry_bitmap_size)
-            {
-                void *bmp_ptr = bs->clean_entry_bitmap_size > sizeof(void*) ? dirty_end->second.bitmap : &dirty_end->second.bitmap;
-                memcpy((void*)(new_entry+1) + bs->clean_entry_bitmap_size, bmp_ptr, bs->clean_entry_bitmap_size);
-            }
         }
         await_sqe(6);
         data->iov = (struct iovec){ meta_new.buf, bs->meta_block_size };
@@ -565,35 +465,14 @@ resume_1:
         }
         // Update clean_db and dirty_db, free old data locations
         update_clean_db();
-#ifdef BLOCKSTORE_DEBUG
-        printf("Flushed %lx:%lx v%lu (%d copies, wr:%d, del:%d), %ld left\n", cur.oid.inode, cur.oid.stripe, cur.version,
-            copy_count, has_writes, has_delete, flusher->flush_queue.size());
-#endif
-    release_oid:
-        repeat_it = flusher->sync_to_repeat.find(cur.oid);
-        if (repeat_it != flusher->sync_to_repeat.end() && repeat_it->second > cur.version)
-        {
-            // Requeue version
-            flusher->unshift_flush({ .oid = cur.oid, .version = repeat_it->second }, false);
-        }
-        flusher->sync_to_repeat.erase(repeat_it);
     trim_journal:
         // Clear unused part of the journal every <journal_trim_interval> flushes
         if (!((++flusher->journal_trim_counter) % flusher->journal_trim_interval) || flusher->trim_wanted > 0)
         {
             flusher->journal_trim_counter = 0;
-            new_trim_pos = bs->journal.get_trim_pos();
-            if (new_trim_pos != bs->journal.used_start)
+            if (bs->journal.trim())
             {
-            resume_19:
-                // Wait for other coroutines trimming the journal, if any
-                if (flusher->trimming)
-                {
-                    wait_state = 19;
-                    return false;
-                }
-                flusher->trimming = true;
-                // First update journal "superblock" and only then update <used_start> in memory
+                // Update journal "superblock"
                 await_sqe(12);
                 *((journal_entry_start*)flusher->journal_superblock) = {
                     .crc32 = 0,
@@ -601,8 +480,7 @@ resume_1:
                     .type = JE_START,
                     .size = sizeof(journal_entry_start),
                     .reserved = 0,
-                    .journal_start = new_trim_pos,
-                    .version = JOURNAL_VERSION,
+                    .journal_start = bs->journal.used_start,
                 };
                 ((journal_entry_start*)flusher->journal_superblock)->crc32 = je_crc32((journal_entry*)flusher->journal_superblock);
                 data->iov = (struct iovec){ flusher->journal_superblock, bs->journal_block_size };
@@ -615,34 +493,20 @@ resume_1:
                     wait_state = 13;
                     return false;
                 }
-                if (!bs->disable_journal_fsync)
-                {
-                    await_sqe(20);
-                    my_uring_prep_fsync(sqe, bs->journal.fd, IORING_FSYNC_DATASYNC);
-                    data->iov = { 0 };
-                    data->callback = simple_callback_w;
-                resume_21:
-                    if (wait_count > 0)
-                    {
-                        wait_state = 21;
-                        return false;
-                    }
-                }
-                bs->journal.used_start = new_trim_pos;
-#ifdef BLOCKSTORE_DEBUG
-                printf("Journal trimmed to %08lx (next_free=%08lx)\n", bs->journal.used_start, bs->journal.next_free);
-#endif
-                flusher->trimming = false;
-            }
-            if (bs->journal.flush_journal && !flusher->flush_queue.size())
-            {
-                assert(bs->journal.used_start == bs->journal.next_free);
-                printf("Journal flushed\n");
-                exit(0);
             }
         }
         // All done
+#ifdef BLOCKSTORE_DEBUG
+        printf("Flushed %lu:%lu v%lu (%ld left)\n", cur.oid.inode, cur.oid.stripe, cur.version, flusher->flush_queue.size());
+#endif
         flusher->active_flushers--;
+        repeat_it = flusher->sync_to_repeat.find(cur.oid);
+        if (repeat_it != flusher->sync_to_repeat.end() && repeat_it->second > cur.version)
+        {
+            // Requeue version
+            flusher->unshift_flush({ .oid = cur.oid, .version = repeat_it->second });
+        }
+        flusher->sync_to_repeat.erase(repeat_it);
         wait_state = 0;
         goto resume_0;
     }
@@ -666,16 +530,7 @@ bool journal_flusher_co::scan_dirty(int wait_base)
     clean_init_bitmap = false;
     while (1)
     {
-        if (!IS_STABLE(dirty_it->second.state))
-        {
-            char err[1024];
-            snprintf(
-                err, 1024, "BUG: Unexpected dirty_entry %lx:%lx v%lu unstable state during flush: 0x%x",
-                dirty_it->first.oid.inode, dirty_it->first.oid.stripe, dirty_it->first.version, dirty_it->second.state
-            );
-            throw std::runtime_error(err);
-        }
-        else if (IS_JOURNAL(dirty_it->second.state) && !skip_copy)
+        if (dirty_it->second.state == ST_J_STABLE && !skip_copy)
         {
             // First we submit all reads
             has_writes = true;
@@ -693,18 +548,18 @@ bool journal_flusher_co::scan_dirty(int wait_base)
                     {
                         submit_offset = dirty_it->second.location + offset - dirty_it->second.offset;
                         submit_len = it == v.end() || it->offset >= end_offset ? end_offset-offset : it->offset-offset;
-                        it = v.insert(it, (copy_buffer_t){ .offset = offset, .len = submit_len, .buf = memalign_or_die(MEM_ALIGNMENT, submit_len) });
+                        it = v.insert(it, (copy_buffer_t){ .offset = offset, .len = submit_len, .buf = memalign(MEM_ALIGNMENT, submit_len) });
                         copy_count++;
                         if (bs->journal.inmemory)
                         {
                             // Take it from memory
-                            memcpy(it->buf, bs->journal.buffer + submit_offset, submit_len);
+                            memcpy(v.back().buf, bs->journal.buffer + submit_offset, submit_len);
                         }
                         else
                         {
                             // Read it from disk
                             await_sqe(0);
-                            data->iov = (struct iovec){ it->buf, (size_t)submit_len };
+                            data->iov = (struct iovec){ v.back().buf, (size_t)submit_len };
                             data->callback = simple_callback_r;
                             my_uring_prep_readv(
                                 sqe, bs->journal.fd, &data->iov, 1, bs->journal.offset + submit_offset
@@ -718,7 +573,7 @@ bool journal_flusher_co::scan_dirty(int wait_base)
                 }
             }
         }
-        else if (IS_BIG_WRITE(dirty_it->second.state) && !skip_copy)
+        else if (dirty_it->second.state == ST_D_STABLE && !skip_copy)
         {
             // There is an unflushed big write. Copy small writes in its position
             has_writes = true;
@@ -728,12 +583,21 @@ bool journal_flusher_co::scan_dirty(int wait_base)
             clean_bitmap_len = dirty_it->second.len;
             skip_copy = true;
         }
-        else if (IS_DELETE(dirty_it->second.state) && !skip_copy)
+        else if (dirty_it->second.state == ST_DEL_STABLE && !skip_copy)
         {
             // There is an unflushed delete
             has_delete = true;
             skip_copy = true;
         }
+        else if (!IS_STABLE(dirty_it->second.state))
+        {
+            char err[1024];
+            snprintf(
+                err, 1024, "BUG: Unexpected dirty_entry %lu:%lu v%lu state during flush: %d",
+                dirty_it->first.oid.inode, dirty_it->first.oid.stripe, dirty_it->first.version, dirty_it->second.state
+            );
+            throw std::runtime_error(err);
+        }
         dirty_start = dirty_it;
         if (dirty_it == bs->dirty_db.begin())
         {
@@ -769,7 +633,7 @@ bool journal_flusher_co::modify_meta_read(uint64_t meta_loc, flusher_meta_write_
     if (wr.it == flusher->meta_sectors.end())
     {
         // Not in memory yet, read it
-        wr.buf = memalign_or_die(MEM_ALIGNMENT, bs->meta_block_size);
+        wr.buf = memalign(MEM_ALIGNMENT, bs->meta_block_size);
         wr.it = flusher->meta_sectors.emplace(wr.sector, (meta_sector_t){
             .offset = wr.sector,
             .len = bs->meta_block_size,
@@ -799,10 +663,7 @@ void journal_flusher_co::update_clean_db()
     if (old_clean_loc != UINT64_MAX && old_clean_loc != clean_loc)
     {
 #ifdef BLOCKSTORE_DEBUG
-        printf("Free block %lu from %lx:%lx v%lu (new location is %lu)\n",
-            old_clean_loc >> bs->block_order,
-            cur.oid.inode, cur.oid.stripe, cur.version,
-            clean_loc >> bs->block_order);
+        printf("Free block %lu\n", old_clean_loc >> bs->block_order);
 #endif
         bs->data_alloc->set(old_clean_loc >> bs->block_order, false);
     }
@@ -810,11 +671,6 @@ void journal_flusher_co::update_clean_db()
     {
         auto clean_it = bs->clean_db.find(cur.oid);
         bs->clean_db.erase(clean_it);
-#ifdef BLOCKSTORE_DEBUG
-        printf("Free block %lu from %lx:%lx v%lu (delete)\n",
-            clean_loc >> bs->block_order,
-            cur.oid.inode, cur.oid.stripe, cur.version);
-#endif
         bs->data_alloc->set(clean_loc >> bs->block_order, false);
         clean_loc = UINT64_MAX;
     }
@@ -836,7 +692,7 @@ bool journal_flusher_co::fsync_batch(bool fsync_meta, int wait_base)
         goto resume_1;
     else if (wait_state == wait_base+2)
         goto resume_2;
-    if (!(fsync_meta ? bs->disable_meta_fsync : bs->disable_data_fsync))
+    if (!(fsync_meta ? bs->disable_meta_fsync : bs->disable_journal_fsync))
     {
         cur_sync = flusher->syncs.end();
         while (cur_sync != flusher->syncs.begin())
@@ -855,34 +711,31 @@ bool journal_flusher_co::fsync_batch(bool fsync_meta, int wait_base)
     sync_found:
         cur_sync->ready_count++;
         flusher->syncing_flushers++;
-    resume_1:
-        if (!cur_sync->state)
+        if (flusher->syncing_flushers >= flusher->flusher_count || !flusher->flush_queue.size())
         {
-            if (flusher->syncing_flushers >= flusher->cur_flusher_count || !flusher->flush_queue.size())
+            // Sync batch is ready. Do it.
+            await_sqe(0);
+            data->iov = { 0 };
+            data->callback = simple_callback_w;
+            my_uring_prep_fsync(sqe, fsync_meta ? bs->meta_fd : bs->data_fd, IORING_FSYNC_DATASYNC);
+            cur_sync->state = 1;
+            wait_count++;
+        resume_1:
+            if (wait_count > 0)
             {
-                // Sync batch is ready. Do it.
-                await_sqe(0);
-                data->iov = { 0 };
-                data->callback = simple_callback_w;
-                my_uring_prep_fsync(sqe, fsync_meta ? bs->meta_fd : bs->data_fd, IORING_FSYNC_DATASYNC);
-                cur_sync->state = 1;
-                wait_count++;
-            resume_2:
-                if (wait_count > 0)
-                {
-                    wait_state = 2;
-                    return false;
-                }
-                // Sync completed. All previous coroutines waiting for it must be resumed
-                cur_sync->state = 2;
-                bs->ringloop->wakeup();
-            }
-            else
-            {
-                // Wait until someone else sends and completes a sync.
                 wait_state = 1;
                 return false;
             }
+            // Sync completed. All previous coroutines waiting for it must be resumed
+            cur_sync->state = 2;
+            bs->ringloop->wakeup();
+        }
+        // Wait until someone else sends and completes a sync.
+    resume_2:
+        if (!cur_sync->state)
+        {
+            wait_state = 2;
+            return false;
         }
         flusher->syncing_flushers--;
         cur_sync->ready_count--;
@@ -893,3 +746,35 @@ bool journal_flusher_co::fsync_batch(bool fsync_meta, int wait_base)
     }
     return true;
 }
+
+void journal_flusher_co::bitmap_set(void *bitmap, uint64_t start, uint64_t len)
+{
+    if (start == 0)
+    {
+        if (len == 32*bs->bitmap_granularity)
+        {
+            *((uint32_t*)bitmap) = UINT32_MAX;
+            return;
+        }
+        else if (len == 64*bs->bitmap_granularity)
+        {
+            *((uint64_t*)bitmap) = UINT64_MAX;
+            return;
+        }
+    }
+    unsigned bit_start = start / bs->bitmap_granularity;
+    unsigned bit_end = ((start + len) + bs->bitmap_granularity - 1) / bs->bitmap_granularity;
+    while (bit_start < bit_end)
+    {
+        if (!(bit_start & 7) && bit_end >= bit_start+8)
+        {
+            ((uint8_t*)bitmap)[bit_start / 8] = UINT8_MAX;
+            bit_start += 8;
+        }
+        else
+        {
+            ((uint8_t*)bitmap)[bit_start / 8] |= 1 << (bit_start % 8);
+            bit_start++;
+        }
+    }
+}

blockstore_flush.h

@@ -1,6 +1,3 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 (see README.md for details)
-
 struct copy_buffer_t
 {
     uint64_t offset, len;
@@ -59,8 +56,6 @@ class journal_flusher_co
     uint64_t clean_bitmap_offset, clean_bitmap_len;
     void *new_clean_bitmap;
 
-    uint64_t new_trim_pos;
-
     // local: scan_dirty()
     uint64_t offset, end_offset, submit_offset, submit_len;
 
@@ -69,6 +64,7 @@ class journal_flusher_co
     bool modify_meta_read(uint64_t meta_loc, flusher_meta_write_t &wr, int wait_base);
     void update_clean_db();
     bool fsync_batch(bool fsync_meta, int wait_base);
+    void bitmap_set(void *bitmap, uint64_t start, uint64_t len);
 public:
     journal_flusher_co();
     bool loop();
@@ -79,14 +75,13 @@ class journal_flusher_t
 {
     int trim_wanted = 0;
     bool dequeuing;
-    int min_flusher_count, max_flusher_count, cur_flusher_count, target_flusher_count;
+    int flusher_count;
     int flusher_start_threshold;
     journal_flusher_co *co;
     blockstore_impl_t *bs;
     friend class journal_flusher_co;
 
     int journal_trim_counter, journal_trim_interval;
-    bool trimming;
     void* journal_superblock;
 
     int active_flushers;
@@ -98,14 +93,12 @@ class journal_flusher_t
     std::deque<object_id> flush_queue;
     std::map<object_id, uint64_t> flush_versions;
 public:
-    journal_flusher_t(blockstore_impl_t *bs);
+    journal_flusher_t(int flusher_count, blockstore_impl_t *bs);
     ~journal_flusher_t();
     void loop();
     bool is_active();
-    void mark_trim_possible();
     void request_trim();
     void release_trim();
     void enqueue_flush(obj_ver_id oid);
-    void unshift_flush(obj_ver_id oid, bool force);
-    void remove_flush(object_id oid);
+    void unshift_flush(obj_ver_id oid);
 };

blockstore_impl.cpp

@@ -1,19 +1,15 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 (see README.md for details)
-
 #include "blockstore_impl.h"
 
-blockstore_impl_t::blockstore_impl_t(blockstore_config_t & config, ring_loop_t *ringloop, timerfd_manager_t *tfd)
+blockstore_impl_t::blockstore_impl_t(blockstore_config_t & config, ring_loop_t *ringloop)
 {
     assert(sizeof(blockstore_op_private_t) <= BS_OP_PRIVATE_DATA_SIZE);
-    this->tfd = tfd;
     this->ringloop = ringloop;
     ring_consumer.loop = [this]() { loop(); };
     ringloop->register_consumer(&ring_consumer);
     initialized = 0;
+    zero_object = (uint8_t*)memalign(MEM_ALIGNMENT, block_size);
     data_fd = meta_fd = journal.fd = -1;
     parse_config(config);
-    zero_object = (uint8_t*)memalign_or_die(MEM_ALIGNMENT, block_size);
     try
     {
         open_data();
@@ -32,7 +28,7 @@ blockstore_impl_t::blockstore_impl_t(blockstore_config_t & config, ring_loop_t *
             close(journal.fd);
         throw;
     }
-    flusher = new journal_flusher_t(this);
+    flusher = new journal_flusher_t(flusher_count, this);
 }
 
 blockstore_impl_t::~blockstore_impl_t()
@@ -93,36 +89,35 @@ void blockstore_impl_t::loop()
             {
                 delete journal_init_reader;
                 journal_init_reader = NULL;
-                if (journal.flush_journal)
-                    initialized = 3;
-                else
-                    initialized = 10;
+                initialized = 10;
                 ringloop->wakeup();
             }
         }
-        if (initialized == 3)
-        {
-            if (readonly)
-            {
-                printf("Can't flush the journal in readonly mode\n");
-                exit(1);
-            }
-            flusher->loop();
-            ringloop->submit();
-        }
     }
     else
     {
         // try to submit ops
         unsigned initial_ring_space = ringloop->space_left();
-        // has_writes == 0 - no writes before the current queue item
-        // has_writes == 1 - some writes in progress
-        // has_writes == 2 - tried to submit some writes, but failed
-        int has_writes = 0, op_idx = 0, new_idx = 0;
-        for (; op_idx < submit_queue.size(); op_idx++, new_idx++)
+        // FIXME: rework this "sync polling"
+        auto cur_sync = in_progress_syncs.begin();
+        while (cur_sync != in_progress_syncs.end())
         {
-            auto op = submit_queue[op_idx];
-            submit_queue[new_idx] = op;
+            if (continue_sync(*cur_sync) != 2)
+            {
+                // List is unmodified
+                cur_sync++;
+            }
+            else
+            {
+                cur_sync = in_progress_syncs.begin();
+            }
+        }
+        auto cur = submit_queue.begin();
+        int has_writes = 0;
+        while (cur != submit_queue.end())
+        {
+            auto op_ptr = cur;
+            auto op = *(cur++);
             // FIXME: This needs some simplification
             // Writes should not block reads if the ring is not full and reads don't depend on them
             // In all other cases we should stop submission
@@ -135,7 +130,7 @@ void blockstore_impl_t::loop()
                 }
                 else if (PRIV(op)->wait_for)
                 {
-                    if (op->opcode == BS_OP_WRITE || op->opcode == BS_OP_WRITE_STABLE || op->opcode == BS_OP_DELETE)
+                    if (op->opcode == BS_OP_WRITE || op->opcode == BS_OP_DELETE)
                     {
                         has_writes = 2;
                     }
@@ -144,33 +139,30 @@ void blockstore_impl_t::loop()
             }
             unsigned ring_space = ringloop->space_left();
             unsigned prev_sqe_pos = ringloop->save();
-            // 0 = can't submit
-            // 1 = in progress
-            // 2 = can be removed from queue
-            int wr_st = 0;
+            bool dequeue_op = false;
             if (op->opcode == BS_OP_READ)
             {
-                wr_st = dequeue_read(op);
+                dequeue_op = dequeue_read(op);
             }
-            else if (op->opcode == BS_OP_WRITE || op->opcode == BS_OP_WRITE_STABLE)
+            else if (op->opcode == BS_OP_WRITE)
             {
                 if (has_writes == 2)
                 {
-                    // Some writes already could not be submitted
-                    continue;
+                    // Some writes could not be submitted
+                    break;
                 }
-                wr_st = dequeue_write(op);
-                has_writes = wr_st > 0 ? 1 : 2;
+                dequeue_op = dequeue_write(op);
+                has_writes = dequeue_op ? 1 : 2;
             }
             else if (op->opcode == BS_OP_DELETE)
             {
                 if (has_writes == 2)
                 {
-                    // Some writes already could not be submitted
-                    continue;
+                    // Some writes could not be submitted
+                    break;
                 }
-                wr_st = dequeue_del(op);
-                has_writes = wr_st > 0 ? 1 : 2;
+                dequeue_op = dequeue_del(op);
+                has_writes = dequeue_op ? 1 : 2;
             }
             else if (op->opcode == BS_OP_SYNC)
             {
@@ -183,31 +175,43 @@ void blockstore_impl_t::loop()
                     // Can't submit SYNC before previous writes
                     continue;
                 }
-                wr_st = continue_sync(op, false);
-                if (wr_st != 2)
-                {
-                    has_writes = wr_st > 0 ? 1 : 2;
-                }
+                dequeue_op = dequeue_sync(op);
             }
             else if (op->opcode == BS_OP_STABLE)
             {
-                wr_st = dequeue_stable(op);
+                if (has_writes == 2)
+                {
+                    // Don't submit additional flushes before completing previous LISTs
+                    break;
+                }
+                dequeue_op = dequeue_stable(op);
             }
             else if (op->opcode == BS_OP_ROLLBACK)
             {
-                wr_st = dequeue_rollback(op);
+                if (has_writes == 2)
+                {
+                    // Don't submit additional flushes before completing previous LISTs
+                    break;
+                }
+                dequeue_op = dequeue_rollback(op);
             }
             else if (op->opcode == BS_OP_LIST)
             {
-                // LIST doesn't need to be blocked by previous modifications
-                process_list(op);
-                wr_st = 2;
+                // Block LIST operation by previous modifications,
+                // so it always returns a consistent state snapshot
+                if (has_writes == 2 || inflight_writes > 0)
+                    has_writes = 2;
+                else
+                {
+                    process_list(op);
+                    dequeue_op = true;
+                }
             }
-            if (wr_st == 2)
+            if (dequeue_op)
             {
-                new_idx--;
+                submit_queue.erase(op_ptr);
             }
-            if (wr_st == 0)
+            else
             {
                 ringloop->restore(prev_sqe_pos);
                 if (PRIV(op)->wait_for == WAIT_SQE)
@@ -218,14 +222,6 @@ void blockstore_impl_t::loop()
                 }
             }
         }
-        if (op_idx != new_idx)
-        {
-            while (op_idx < submit_queue.size())
-            {
-                submit_queue[new_idx++] = submit_queue[op_idx++];
-            }
-            submit_queue.resize(new_idx);
-        }
         if (!readonly)
         {
             flusher->loop();
@@ -248,7 +244,7 @@ bool blockstore_impl_t::is_safe_to_stop()
 {
     // It's safe to stop blockstore when there are no in-flight operations,
     // no in-progress syncs and flusher isn't doing anything
-    if (submit_queue.size() > 0 || !readonly && flusher->is_active())
+    if (submit_queue.size() > 0 || in_progress_syncs.size() > 0 || !readonly && flusher->is_active())
     {
         return false;
     }
@@ -302,7 +298,7 @@ void blockstore_impl_t::check_wait(blockstore_op_t *op)
     else if (PRIV(op)->wait_for == WAIT_JOURNAL_BUFFER)
     {
         int next = ((journal.cur_sector + 1) % journal.sector_count);
-        if (journal.sector_info[next].flush_count > 0 ||
+        if (journal.sector_info[next].usage_count > 0 ||
             journal.sector_info[next].dirty)
         {
             // do not submit
@@ -315,7 +311,7 @@ void blockstore_impl_t::check_wait(blockstore_op_t *op)
     }
     else if (PRIV(op)->wait_for == WAIT_FREE)
     {
-        if (!data_alloc->get_free_count() && flusher->is_active())
+        if (!data_alloc->get_free_count() && !flusher->is_active())
         {
 #ifdef BLOCKSTORE_DEBUG
             printf("Still waiting for free space on the data device\n");
@@ -330,15 +326,16 @@ void blockstore_impl_t::check_wait(blockstore_op_t *op)
     }
 }
 
-void blockstore_impl_t::enqueue_op(blockstore_op_t *op)
+void blockstore_impl_t::enqueue_op(blockstore_op_t *op, bool first)
 {
     if (op->opcode < BS_OP_MIN || op->opcode > BS_OP_MAX ||
-        ((op->opcode == BS_OP_READ || op->opcode == BS_OP_WRITE || op->opcode == BS_OP_WRITE_STABLE) && (
+        ((op->opcode == BS_OP_READ || op->opcode == BS_OP_WRITE) && (
             op->offset >= block_size ||
             op->len > block_size-op->offset ||
             (op->len % disk_alignment)
         )) ||
-        readonly && op->opcode != BS_OP_READ && op->opcode != BS_OP_LIST)
+        readonly && op->opcode != BS_OP_READ && op->opcode != BS_OP_LIST ||
+        first && op->opcode == BS_OP_WRITE)
     {
         // Basic verification not passed
         op->retval = -EINVAL;
@@ -383,17 +380,30 @@ void blockstore_impl_t::enqueue_op(blockstore_op_t *op)
             }
         };
     }
-    if ((op->opcode == BS_OP_WRITE || op->opcode == BS_OP_WRITE_STABLE || op->opcode == BS_OP_DELETE) && !enqueue_write(op))
+    if ((op->opcode == BS_OP_WRITE || op->opcode == BS_OP_DELETE) && !enqueue_write(op))
     {
         std::function<void (blockstore_op_t*)>(op->callback)(op);
         return;
     }
+    if (op->opcode == BS_OP_SYNC && immediate_commit == IMMEDIATE_ALL)
+    {
+        op->retval = 0;
+        std::function<void (blockstore_op_t*)>(op->callback)(op);
+        return;
+    }
     // Call constructor without allocating memory. We'll call destructor before returning op back
     new ((void*)op->private_data) blockstore_op_private_t;
     PRIV(op)->wait_for = 0;
     PRIV(op)->op_state = 0;
     PRIV(op)->pending_ops = 0;
-    submit_queue.push_back(op);
+    if (!first)
+    {
+        submit_queue.push_back(op);
+    }
+    else
+    {
+        submit_queue.push_front(op);
+    }
     ringloop->wakeup();
 }
 
@@ -421,12 +431,10 @@ static bool replace_stable(object_id oid, uint64_t version, int search_start, in
 
 void blockstore_impl_t::process_list(blockstore_op_t *op)
 {
+    // Check PG
     uint32_t list_pg = op->offset;
     uint32_t pg_count = op->len;
     uint64_t pg_stripe_size = op->oid.stripe;
-    uint64_t min_inode = op->oid.inode;
-    uint64_t max_inode = op->version;
-    // Check PG
     if (pg_count != 0 && (pg_stripe_size < MIN_BLOCK_SIZE || list_pg >= pg_count))
     {
         op->retval = -EINVAL;
@@ -442,122 +450,88 @@ void blockstore_impl_t::process_list(blockstore_op_t *op)
         FINISH_OP(op);
         return;
     }
+    for (auto it = clean_db.begin(); it != clean_db.end(); it++)
     {
-        auto clean_it = clean_db.begin(), clean_end = clean_db.end();
-        if ((min_inode != 0 || max_inode != 0) && min_inode <= max_inode)
+        if (!pg_count || ((it->first.inode + it->first.stripe / pg_stripe_size) % pg_count) == list_pg)
         {
-            clean_it = clean_db.lower_bound({
-                .inode = min_inode,
-                .stripe = 0,
-            });
-            clean_end = clean_db.upper_bound({
-                .inode = max_inode,
-                .stripe = UINT64_MAX,
-            });
-        }
-        for (; clean_it != clean_end; clean_it++)
-        {
-            if (!pg_count || ((clean_it->first.stripe / pg_stripe_size) % pg_count) == list_pg) // like map_to_pg()
+            if (stable_count >= stable_alloc)
             {
-                if (stable_count >= stable_alloc)
+                stable_alloc += 32768;
+                stable = (obj_ver_id*)realloc(stable, sizeof(obj_ver_id) * stable_alloc);
+                if (!stable)
                 {
-                    stable_alloc += 32768;
-                    stable = (obj_ver_id*)realloc(stable, sizeof(obj_ver_id) * stable_alloc);
-                    if (!stable)
-                    {
-                        op->retval = -ENOMEM;
-                        FINISH_OP(op);
-                        return;
-                    }
+                    op->retval = -ENOMEM;
+                    FINISH_OP(op);
+                    return;
                 }
-                stable[stable_count++] = {
-                    .oid = clean_it->first,
-                    .version = clean_it->second.version,
-                };
             }
+            stable[stable_count++] = {
+                .oid = it->first,
+                .version = it->second.version,
+            };
         }
     }
     int clean_stable_count = stable_count;
     // Copy dirty_db entries (sorted, too)
     int unstable_count = 0, unstable_alloc = 0;
     obj_ver_id *unstable = NULL;
+    for (auto it = dirty_db.begin(); it != dirty_db.end(); it++)
     {
-        auto dirty_it = dirty_db.begin(), dirty_end = dirty_db.end();
-        if ((min_inode != 0 || max_inode != 0) && min_inode <= max_inode)
+        if (!pg_count || ((it->first.oid.inode + it->first.oid.stripe / pg_stripe_size) % pg_count) == list_pg)
         {
-            dirty_it = dirty_db.lower_bound({
-                .oid = {
-                    .inode = min_inode,
-                    .stripe = 0,
-                },
-                .version = 0,
-            });
-            dirty_end = dirty_db.upper_bound({
-                .oid = {
-                    .inode = max_inode,
-                    .stripe = UINT64_MAX,
-                },
-                .version = UINT64_MAX,
-            });
-        }
-        for (; dirty_it != dirty_end; dirty_it++)
-        {
-            if (!pg_count || ((dirty_it->first.oid.stripe / pg_stripe_size) % pg_count) == list_pg) // like map_to_pg()
+            if (IS_DELETE(it->second.state))
             {
-                if (IS_DELETE(dirty_it->second.state))
+                // Deletions are always stable, so try to zero out two possible entries
+                if (!replace_stable(it->first.oid, 0, 0, clean_stable_count, stable))
                 {
-                    // Deletions are always stable, so try to zero out two possible entries
-                    if (!replace_stable(dirty_it->first.oid, 0, 0, clean_stable_count, stable))
-                    {
-                        replace_stable(dirty_it->first.oid, 0, clean_stable_count, stable_count, stable);
-                    }
+                    replace_stable(it->first.oid, 0, clean_stable_count, stable_count, stable);
                 }
-                else if (IS_STABLE(dirty_it->second.state))
+            }
+            else if (IS_STABLE(it->second.state))
+            {
+                // First try to replace a clean stable version in the first part of the list
+                if (!replace_stable(it->first.oid, it->first.version, 0, clean_stable_count, stable))
                 {
-                    // First try to replace a clean stable version in the first part of the list
-                    if (!replace_stable(dirty_it->first.oid, dirty_it->first.version, 0, clean_stable_count, stable))
+                    // Then try to replace the last dirty stable version in the second part of the list
+                    if (stable[stable_count-1].oid == it->first.oid)
                     {
-                        // Then try to replace the last dirty stable version in the second part of the list
-                        if (stable_count > 0 && stable[stable_count-1].oid == dirty_it->first.oid)
+                        stable[stable_count-1].version = it->first.version;
+                    }
+                    else
+                    {
+                        if (stable_count >= stable_alloc)
                         {
-                            stable[stable_count-1].version = dirty_it->first.version;
-                        }
-                        else
-                        {
-                            if (stable_count >= stable_alloc)
+                            stable_alloc += 32768;
+                            stable = (obj_ver_id*)realloc(stable, sizeof(obj_ver_id) * stable_alloc);
+                            if (!stable)
                             {
-                                stable_alloc += 32768;
-                                stable = (obj_ver_id*)realloc(stable, sizeof(obj_ver_id) * stable_alloc);
-                                if (!stable)
-                                {
-                                    if (unstable)
-                                        free(unstable);
-                                    op->retval = -ENOMEM;
-                                    FINISH_OP(op);
-                                    return;
-                                }
+                                if (unstable)
+                                    free(unstable);
+                                op->retval = -ENOMEM;
+                                FINISH_OP(op);
+                                return;
                             }
-                            stable[stable_count++] = dirty_it->first;
                         }
+                        stable[stable_count++] = it->first;
                     }
                 }
-                else
+            }
+            else
+            {
+                if (unstable_count >= unstable_alloc)
                 {
-                    if (unstable_count >= unstable_alloc)
+                    unstable_alloc += 32768;
+                    unstable = (obj_ver_id*)realloc(unstable, sizeof(obj_ver_id) * unstable_alloc);
+                    if (!unstable)
                     {
-                        unstable_alloc += 32768;
-                        unstable = (obj_ver_id*)realloc(unstable, sizeof(obj_ver_id) * unstable_alloc);
-                        if (!unstable)
-                        {
-                            if (stable)
-                                free(stable);
-                            op->retval = -ENOMEM;
-                            FINISH_OP(op);
-                            return;
-                        }
+                        if (stable)
+                            free(stable);
+                        op->retval = -ENOMEM;
+                        FINISH_OP(op);
+                        return;
                     }
-                    unstable[unstable_count++] = dirty_it->first;
                 }
+                unstable[unstable_count++] = it->first;
             }
         }
     }

blockstore_impl.h

@@ -1,6 +1,3 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 (see README.md for details)
-
 #pragma once
 
 #include "blockstore.h"
@@ -9,8 +6,8 @@
 #include <sys/ioctl.h>
 #include <sys/stat.h>
 #include <fcntl.h>
-#include <time.h>
 #include <unistd.h>
+#include <malloc.h>
 #include <linux/fs.h>
 
 #include <vector>
@@ -20,39 +17,45 @@
 
 #include "cpp-btree/btree_map.h"
 
-#include "malloc_or_die.h"
 #include "allocator.h"
 
 //#define BLOCKSTORE_DEBUG
 
 // States are not stored on disk. Instead, they're deduced from the journal
+// FIXME: Rename to BS_ST_*
 
-#define BS_ST_SMALL_WRITE 0x01
-#define BS_ST_BIG_WRITE 0x02
-#define BS_ST_DELETE 0x03
+#define ST_J_WAIT_BIG 1
+#define ST_J_IN_FLIGHT 2
+#define ST_J_SUBMITTED 3
+#define ST_J_WRITTEN 4
+#define ST_J_SYNCED 5
+#define ST_J_STABLE 6
 
-#define BS_ST_WAIT_DEL 0x10
-#define BS_ST_WAIT_BIG 0x20
-#define BS_ST_IN_FLIGHT 0x30
-#define BS_ST_SUBMITTED 0x40
-#define BS_ST_WRITTEN 0x50
-#define BS_ST_SYNCED 0x60
-#define BS_ST_STABLE 0x70
+#define ST_D_IN_FLIGHT 15
+#define ST_D_SUBMITTED 16
+#define ST_D_WRITTEN 17
+#define ST_D_SYNCED 20
+#define ST_D_STABLE 21
 
-#define BS_ST_INSTANT 0x100
+#define ST_DEL_IN_FLIGHT 31
+#define ST_DEL_SUBMITTED 32
+#define ST_DEL_WRITTEN 33
+#define ST_DEL_SYNCED 34
+#define ST_DEL_STABLE 35
+
+#define ST_CURRENT 48
 
 #define IMMEDIATE_NONE 0
 #define IMMEDIATE_SMALL 1
 #define IMMEDIATE_ALL 2
 
-#define BS_ST_TYPE_MASK 0x0F
-#define BS_ST_WORKFLOW_MASK 0xF0
-#define IS_IN_FLIGHT(st) (((st) & 0xF0) <= BS_ST_SUBMITTED)
-#define IS_STABLE(st) (((st) & 0xF0) == BS_ST_STABLE)
-#define IS_SYNCED(st) (((st) & 0xF0) >= BS_ST_SYNCED)
-#define IS_JOURNAL(st) (((st) & 0x0F) == BS_ST_SMALL_WRITE)
-#define IS_BIG_WRITE(st) (((st) & 0x0F) == BS_ST_BIG_WRITE)
-#define IS_DELETE(st) (((st) & 0x0F) == BS_ST_DELETE)
+#define IS_IN_FLIGHT(st) (st == ST_J_WAIT_BIG || st == ST_J_IN_FLIGHT || st == ST_D_IN_FLIGHT || st == ST_DEL_IN_FLIGHT || st == ST_J_SUBMITTED || st == ST_D_SUBMITTED || st == ST_DEL_SUBMITTED)
+#define IS_STABLE(st) (st == ST_J_STABLE || st == ST_D_STABLE || st == ST_DEL_STABLE || st == ST_CURRENT)
+#define IS_SYNCED(st) (IS_STABLE(st) || st == ST_J_SYNCED || st == ST_D_SYNCED || st == ST_DEL_SYNCED)
+#define IS_JOURNAL(st) (st >= ST_J_WAIT_BIG && st <= ST_J_STABLE)
+#define IS_BIG_WRITE(st) (st >= ST_D_IN_FLIGHT && st <= ST_D_STABLE)
+#define IS_DELETE(st) (st >= ST_DEL_IN_FLIGHT && st <= ST_DEL_STABLE)
+#define IS_UNSYNCED(st) (st >= ST_J_WAIT_BIG && st <= ST_J_WRITTEN || st >= ST_D_IN_FLIGHT && st <= ST_D_WRITTEN|| st >= ST_DEL_IN_FLIGHT && st <= ST_DEL_WRITTEN)
 
 #define BS_SUBMIT_GET_SQE(sqe, data) \
     BS_SUBMIT_GET_ONLY_SQE(sqe); \
@@ -78,25 +81,7 @@
 
 #include "blockstore_journal.h"
 
-// "VITAstor"
-#define BLOCKSTORE_META_MAGIC 0x726F747341544956l
-#define BLOCKSTORE_META_VERSION 1
-
-// metadata header (superblock)
-// FIXME: After adding the OSD superblock, add a key to metadata
-// and journal headers to check if they belong to the same OSD
-struct __attribute__((__packed__)) blockstore_meta_header_t
-{
-    uint64_t zero;
-    uint64_t magic;
-    uint64_t version;
-    uint32_t meta_block_size;
-    uint32_t data_block_size;
-    uint32_t bitmap_granularity;
-};
-
-// 32 bytes = 24 bytes + block bitmap (4 bytes by default) + external attributes (also bitmap, 4 bytes by default)
-// per "clean" entry on disk with fixed metadata tables
+// 24 bytes + block bitmap per "clean" entry on disk with fixed metadata tables
 // FIXME: maybe add crc32's to metadata
 struct __attribute__((__packed__)) clean_disk_entry
 {
@@ -112,7 +97,7 @@ struct __attribute__((__packed__)) clean_entry
     uint64_t location;
 };
 
-// 64 = 24 + 40 bytes per dirty entry in memory (obj_ver_id => dirty_entry)
+// 56 = 24 + 32 bytes per dirty entry in memory (obj_ver_id => dirty_entry)
 struct __attribute__((__packed__)) dirty_entry
 {
     uint32_t state;
@@ -121,7 +106,6 @@ struct __attribute__((__packed__)) dirty_entry
     uint32_t offset;   // data offset within object (stripe)
     uint32_t len;      // data length
     uint64_t journal_sector; // journal sector used for this entry
-    void* bitmap;   // either external bitmap itself when it fits, or a pointer to it when it doesn't
 };
 
 // - Sync must be submitted after previous writes/deletes (not before!)
@@ -174,13 +158,12 @@ struct blockstore_op_private_t
 
     // Write
     struct iovec iov_zerofill[3];
-    // Warning: must not have a default value here because it's written to before calling constructor in blockstore_write.cpp O_o
-    uint64_t real_version;
-    timespec tv_begin;
 
     // Sync
     std::vector<obj_ver_id> sync_big_writes, sync_small_writes;
     int sync_small_checked, sync_big_checked;
+    std::list<blockstore_op_t*>::iterator in_progress_ptr;
+    int prev_sync_count;
 };
 
 // https://github.com/algorithm-ninja/cpp-btree
@@ -218,18 +201,7 @@ class blockstore_impl_t
     // Suitable only for server SSDs with capacitors, requires disabled data and journal fsyncs
     int immediate_commit = IMMEDIATE_NONE;
     bool inmemory_meta = false;
-    // Maximum and minimum flusher count
-    unsigned max_flusher_count, min_flusher_count;
-    // Maximum queue depth
-    unsigned max_write_iodepth = 128;
-    // Enable small (journaled) write throttling, useful for the SSD+HDD case
-    bool throttle_small_writes = false;
-    // Target data device iops, bandwidth and parallelism for throttling (100/100/1 is the default for HDD)
-    int throttle_target_iops = 100;
-    int throttle_target_mbs = 100;
-    int throttle_target_parallelism = 1;
-    // Minimum difference in microseconds between target and real execution times to throttle the response
-    int throttle_threshold_us = 50;
+    int flusher_count;
     /******* END OF OPTIONS *******/
 
     struct ring_consumer_t ring_consumer;
@@ -237,9 +209,9 @@ class blockstore_impl_t
     blockstore_clean_db_t clean_db;
     uint8_t *clean_bitmap = NULL;
     blockstore_dirty_db_t dirty_db;
-    std::vector<blockstore_op_t*> submit_queue;
+    std::list<blockstore_op_t*> submit_queue; // FIXME: funny thing is that vector is better here
     std::vector<obj_ver_id> unsynced_big_writes, unsynced_small_writes;
-    int unsynced_big_write_count = 0;
+    std::list<blockstore_op_t*> in_progress_syncs; // ...and probably here, too
     allocator *data_alloc = NULL;
     uint8_t *zero_object;
 
@@ -256,11 +228,10 @@ class blockstore_impl_t
 
     struct journal_t journal;
     journal_flusher_t *flusher;
-    int write_iodepth = 0;
 
     bool live = false, queue_stall = false;
     ring_loop_t *ringloop;
-    timerfd_manager_t *tfd;
+    int inflight_writes = 0;
 
     bool stop_sync_submitted;
 
@@ -280,7 +251,6 @@ class blockstore_impl_t
     void open_data();
     void open_meta();
     void open_journal();
-    uint8_t* get_clean_entry_bitmap(uint64_t block_loc, int offset);
 
     // Asynchronous init
     int initialized;
@@ -300,7 +270,6 @@ class blockstore_impl_t
 
     // Write
     bool enqueue_write(blockstore_op_t *op);
-    void cancel_all_writes(blockstore_op_t *op, blockstore_dirty_db_t::iterator dirty_it, int retval);
     int dequeue_write(blockstore_op_t *op);
     int dequeue_del(blockstore_op_t *op);
     int continue_write(blockstore_op_t *op);
@@ -308,14 +277,16 @@ class blockstore_impl_t
     void handle_write_event(ring_data_t *data, blockstore_op_t *op);
 
     // Sync
-    int continue_sync(blockstore_op_t *op, bool queue_has_in_progress_sync);
+    int dequeue_sync(blockstore_op_t *op);
     void handle_sync_event(ring_data_t *data, blockstore_op_t *op);
-    void ack_sync(blockstore_op_t *op);
+    int continue_sync(blockstore_op_t *op);
+    void ack_one_sync(blockstore_op_t *op);
+    int ack_sync(blockstore_op_t *op);
 
     // Stabilize
     int dequeue_stable(blockstore_op_t *op);
     int continue_stable(blockstore_op_t *op);
-    void mark_stable(const obj_ver_id & ov, bool forget_dirty = false);
+    void mark_stable(const obj_ver_id & ov);
     void handle_stable_event(ring_data_t *data, blockstore_op_t *op);
     void stabilize_object(object_id oid, uint64_t max_ver);
 
@@ -331,7 +302,7 @@ class blockstore_impl_t
 
 public:
 
-    blockstore_impl_t(blockstore_config_t & config, ring_loop_t *ringloop, timerfd_manager_t *tfd);
+    blockstore_impl_t(blockstore_config_t & config, ring_loop_t *ringloop);
     ~blockstore_impl_t();
 
     // Event loop
@@ -350,19 +321,13 @@ public:
     bool is_stalled();
 
     // Submission
-    void enqueue_op(blockstore_op_t *op);
-
-    // Simplified synchronous operation: get object bitmap & current version
-    int read_bitmap(object_id oid, uint64_t target_version, void *bitmap, uint64_t *result_version = NULL);
+    void enqueue_op(blockstore_op_t *op, bool first = false);
 
     // Unstable writes are added here (map of object_id -> version)
     std::unordered_map<object_id, uint64_t> unstable_writes;
 
-    // Space usage statistics
-    std::map<uint64_t, uint64_t> inode_space_stats;
-
     inline uint32_t get_block_size() { return block_size; }
     inline uint64_t get_block_count() { return block_count; }
     inline uint64_t get_free_block_count() { return data_alloc->get_free_count(); }
-    inline uint32_t get_bitmap_granularity() { return disk_alignment; }
+    inline uint32_t get_disk_alignment() { return disk_alignment; }
 };

blockstore_init.cpp

@@ -1,22 +1,5 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 (see README.md for details)
-
 #include "blockstore_impl.h"
 
-#define GET_SQE() \
-    sqe = bs->get_sqe();\
-    if (!sqe)\
-        throw std::runtime_error("io_uring is full during initialization");\
-    data = ((ring_data_t*)sqe->user_data)
-
-static bool iszero(uint64_t *buf, int len)
-{
-    for (int i = 0; i < len; i++)
-        if (buf[i] != 0)
-            return false;
-    return true;
-}
-
 blockstore_init_meta::blockstore_init_meta(blockstore_impl_t *bs)
 {
     this->bs = bs;
@@ -24,7 +7,7 @@ blockstore_init_meta::blockstore_init_meta(blockstore_impl_t *bs)
 
 void blockstore_init_meta::handle_event(ring_data_t *data)
 {
-    if (data->res < 0)
+    if (data->res <= 0)
     {
         throw std::runtime_error(
             std::string("read metadata failed at offset ") + std::to_string(metadata_read) +
@@ -42,12 +25,6 @@ int blockstore_init_meta::loop()
 {
     if (wait_state == 1)
         goto resume_1;
-    else if (wait_state == 2)
-        goto resume_2;
-    else if (wait_state == 3)
-        goto resume_3;
-    else if (wait_state == 4)
-        goto resume_4;
     printf("Reading blockstore metadata\n");
     if (bs->inmemory_meta)
         metadata_buffer = bs->metadata_buffer;
@@ -55,98 +32,22 @@ int blockstore_init_meta::loop()
         metadata_buffer = memalign(MEM_ALIGNMENT, 2*bs->metadata_buf_size);
     if (!metadata_buffer)
         throw std::runtime_error("Failed to allocate metadata read buffer");
-    // Read superblock
-    GET_SQE();
-    data->iov = { metadata_buffer, bs->meta_block_size };
-    data->callback = [this](ring_data_t *data) { handle_event(data); };
-    my_uring_prep_readv(sqe, bs->meta_fd, &data->iov, 1, bs->meta_offset);
-    bs->ringloop->submit();
-    submitted = 1;
-resume_1:
-    if (submitted)
-    {
-        wait_state = 1;
-        return 1;
-    }
-    if (iszero((uint64_t*)metadata_buffer, bs->meta_block_size / sizeof(uint64_t)))
-    {
-        {
-            blockstore_meta_header_t *hdr = (blockstore_meta_header_t *)metadata_buffer;
-            hdr->zero = 0;
-            hdr->magic = BLOCKSTORE_META_MAGIC;
-            hdr->version = BLOCKSTORE_META_VERSION;
-            hdr->meta_block_size = bs->meta_block_size;
-            hdr->data_block_size = bs->block_size;
-            hdr->bitmap_granularity = bs->bitmap_granularity;
-        }
-        if (bs->readonly)
-        {
-            printf("Skipping metadata initialization because blockstore is readonly\n");
-        }
-        else
-        {
-            printf("Initializing metadata area\n");
-            GET_SQE();
-            data->iov = (struct iovec){ metadata_buffer, bs->meta_block_size };
-            data->callback = [this](ring_data_t *data) { handle_event(data); };
-            my_uring_prep_writev(sqe, bs->meta_fd, &data->iov, 1, bs->meta_offset);
-            bs->ringloop->submit();
-            submitted = 1;
-        resume_3:
-            if (submitted > 0)
-            {
-                wait_state = 3;
-                return 1;
-            }
-            zero_on_init = true;
-        }
-    }
-    else
-    {
-        blockstore_meta_header_t *hdr = (blockstore_meta_header_t *)metadata_buffer;
-        if (hdr->zero != 0 ||
-            hdr->magic != BLOCKSTORE_META_MAGIC ||
-            hdr->version != BLOCKSTORE_META_VERSION)
-        {
-            printf(
-                "Metadata is corrupt or old version.\n"
-                " If this is a new OSD please zero out the metadata area before starting it.\n"
-                " If you need to upgrade from 0.5.x please request it via the issue tracker.\n"
-            );
-            exit(1);
-        }
-        if (hdr->meta_block_size != bs->meta_block_size ||
-            hdr->data_block_size != bs->block_size ||
-            hdr->bitmap_granularity != bs->bitmap_granularity)
-        {
-            printf(
-                "Configuration stored in metadata superblock"
-                " (meta_block_size=%u, data_block_size=%u, bitmap_granularity=%u)"
-                " differs from OSD configuration (%lu/%u/%lu).\n",
-                hdr->meta_block_size, hdr->data_block_size, hdr->bitmap_granularity,
-                bs->meta_block_size, bs->block_size, bs->bitmap_granularity
-            );
-            exit(1);
-        }
-    }
-    // Skip superblock
-    bs->meta_offset += bs->meta_block_size;
-    prev_done = 0;
-    done_len = 0;
-    done_pos = 0;
-    metadata_read = 0;
-    // Read the rest of the metadata
     while (1)
     {
-    resume_2:
+    resume_1:
         if (submitted)
         {
-            wait_state = 2;
+            wait_state = 1;
             return 1;
         }
         if (metadata_read < bs->meta_len)
         {
-            GET_SQE();
+            sqe = bs->get_sqe();
+            if (!sqe)
+            {
+                throw std::runtime_error("io_uring is full while trying to read metadata");
+            }
+            data = ((ring_data_t*)sqe->user_data);
             data->iov = {
                 metadata_buffer + (bs->inmemory_meta
                     ? metadata_read
@@ -154,14 +55,7 @@ resume_1:
                 bs->meta_len - metadata_read > bs->metadata_buf_size ? bs->metadata_buf_size : bs->meta_len - metadata_read,
             };
             data->callback = [this](ring_data_t *data) { handle_event(data); };
-            if (!zero_on_init)
-                my_uring_prep_readv(sqe, bs->meta_fd, &data->iov, 1, bs->meta_offset + metadata_read);
-            else
-            {
-                // Fill metadata with zeroes
-                memset(data->iov.iov_base, 0, data->iov.iov_len);
-                my_uring_prep_writev(sqe, bs->meta_fd, &data->iov, 1, bs->meta_offset + metadata_read);
-            }
+            my_uring_prep_readv(sqe, bs->meta_fd, &data->iov, 1, bs->meta_offset + metadata_read);
             bs->ringloop->submit();
             submitted = (prev == 1 ? 2 : 1);
             prev = submitted;
@@ -193,21 +87,6 @@ resume_1:
         free(metadata_buffer);
         metadata_buffer = NULL;
     }
-    if (zero_on_init && !bs->disable_meta_fsync)
-    {
-        GET_SQE();
-        my_uring_prep_fsync(sqe, bs->meta_fd, IORING_FSYNC_DATASYNC);
-        data->iov = { 0 };
-        data->callback = [this](ring_data_t *data) { handle_event(data); };
-        submitted = 1;
-        bs->ringloop->submit();
-    resume_4:
-        if (submitted > 0)
-        {
-            wait_state = 4;
-            return 1;
-        }
-    }
     return 0;
 }
 
@@ -218,7 +97,7 @@ void blockstore_init_meta::handle_entries(void* entries, unsigned count, int blo
         clean_disk_entry *entry = (clean_disk_entry*)(entries + i*bs->clean_entry_size);
         if (!bs->inmemory_meta && bs->clean_entry_bitmap_size)
         {
-            memcpy(bs->clean_bitmap + (done_cnt+i)*2*bs->clean_entry_bitmap_size, &entry->bitmap, 2*bs->clean_entry_bitmap_size);
+            memcpy(bs->clean_bitmap + (done_cnt+i)*bs->clean_entry_bitmap_size, &entry->bitmap, bs->clean_entry_bitmap_size);
         }
         if (entry->oid.inode > 0)
         {
@@ -229,20 +108,13 @@ void blockstore_init_meta::handle_entries(void* entries, unsigned count, int blo
                 {
                     // free the previous block
 #ifdef BLOCKSTORE_DEBUG
-                    printf("Free block %lu from %lx:%lx v%lu (new location is %lu)\n",
-                        clean_it->second.location >> block_order,
-                        clean_it->first.inode, clean_it->first.stripe, clean_it->second.version,
-                        done_cnt+i);
+                    printf("Free block %lu\n", clean_it->second.location >> bs->block_order);
 #endif
                     bs->data_alloc->set(clean_it->second.location >> block_order, false);
                 }
-                else
-                {
-                    bs->inode_space_stats[entry->oid.inode] += bs->block_size;
-                }
                 entries_loaded++;
 #ifdef BLOCKSTORE_DEBUG
-                printf("Allocate block (clean entry) %lu: %lx:%lx v%lu\n", done_cnt+i, entry->oid.inode, entry->oid.stripe, entry->version);
+                printf("Allocate block (clean entry) %lu: %lu:%lu v%lu\n", done_cnt+i, entry->oid.inode, entry->oid.stripe, entry->version);
 #endif
                 bs->data_alloc->set(done_cnt+i, true);
                 bs->clean_db[entry->oid] = (struct clean_entry){
@@ -253,7 +125,7 @@ void blockstore_init_meta::handle_entries(void* entries, unsigned count, int blo
             else
             {
 #ifdef BLOCKSTORE_DEBUG
-                printf("Old clean entry %lu: %lx:%lx v%lu\n", done_cnt+i, entry->oid.inode, entry->oid.stripe, entry->version);
+                printf("Old clean entry %lu: %lu:%lu v%lu\n", done_cnt+i, entry->oid.inode, entry->oid.stripe, entry->version);
 #endif
             }
         }
@@ -274,6 +146,14 @@ blockstore_init_journal::blockstore_init_journal(blockstore_impl_t *bs)
     };
 }
 
+bool iszero(uint64_t *buf, int len)
+{
+    for (int i = 0; i < len; i++)
+        if (buf[i] != 0)
+            return false;
+    return true;
+}
+
 void blockstore_init_journal::handle_event(ring_data_t *data1)
 {
     if (data1->res <= 0)
@@ -298,6 +178,12 @@ void blockstore_init_journal::handle_event(ring_data_t *data1)
     submitted_buf = NULL;
 }
 
+#define GET_SQE() \
+    sqe = bs->get_sqe();\
+    if (!sqe)\
+        throw std::runtime_error("io_uring is full while trying to read journal");\
+    data = ((ring_data_t*)sqe->user_data)
+
 int blockstore_init_journal::loop()
 {
     if (wait_state == 1)
@@ -316,7 +202,11 @@ int blockstore_init_journal::loop()
         goto resume_7;
     printf("Reading blockstore journal\n");
     if (!bs->journal.inmemory)
-        submitted_buf = memalign_or_die(MEM_ALIGNMENT, 2*bs->journal.block_size);
+    {
+        submitted_buf = memalign(MEM_ALIGNMENT, 2*bs->journal.block_size);
+        if (!submitted_buf)
+            throw std::bad_alloc();
+    }
     else
         submitted_buf = bs->journal.buffer;
     // Read first block of the journal
@@ -335,7 +225,7 @@ resume_1:
         wait_state = 1;
         return 1;
     }
-    if (iszero((uint64_t*)submitted_buf, bs->journal.block_size / sizeof(uint64_t)))
+    if (iszero((uint64_t*)submitted_buf, 3))
     {
         // Journal is empty
         // FIXME handle this wrapping to journal_block_size better (maybe)
@@ -350,7 +240,6 @@ resume_1:
             .size = sizeof(journal_entry_start),
             .reserved = 0,
             .journal_start = bs->journal.block_size,
-            .version = JOURNAL_VERSION,
         };
         ((journal_entry_start*)submitted_buf)->crc32 = je_crc32((journal_entry*)submitted_buf);
         if (bs->readonly)
@@ -401,21 +290,11 @@ resume_1:
         je_start = (journal_entry_start*)submitted_buf;
         if (je_start->magic != JOURNAL_MAGIC ||
             je_start->type != JE_START ||
-            je_crc32((journal_entry*)je_start) != je_start->crc32 ||
-            je_start->size != sizeof(journal_entry_start) && je_start->size != JE_START_LEGACY_SIZE)
+            je_start->size != sizeof(journal_entry_start) ||
+            je_crc32((journal_entry*)je_start) != je_start->crc32)
         {
             // Entry is corrupt
-            fprintf(stderr, "First entry of the journal is corrupt\n");
-            exit(1);
-        }
-        if (je_start->size == JE_START_LEGACY_SIZE || je_start->version != JOURNAL_VERSION)
-        {
-            fprintf(
-                stderr, "The code only supports journal version %d, but it is %lu on disk."
-                    " Please use the previous version to flush the journal before upgrading OSD\n",
-                JOURNAL_VERSION, je_start->size == JE_START_LEGACY_SIZE ? 0 : je_start->version
-            );
-            exit(1);
+            throw std::runtime_error("first entry of the journal is corrupt");
         }
         next_free = journal_pos = bs->journal.used_start = je_start->journal_start;
         if (!bs->journal.inmemory)
@@ -438,7 +317,7 @@ resume_1:
                 if (journal_pos < bs->journal.used_start)
                     end = bs->journal.used_start;
                 if (!bs->journal.inmemory)
-                    submitted_buf = memalign_or_die(MEM_ALIGNMENT, JOURNAL_BUFFER_SIZE);
+                    submitted_buf = memalign(MEM_ALIGNMENT, JOURNAL_BUFFER_SIZE);
                 else
                     submitted_buf = bs->journal.buffer + journal_pos;
                 data->iov = {
@@ -521,19 +400,8 @@ resume_1:
             }
         }
     }
-    for (auto ov: double_allocs)
-    {
-        auto dirty_it = bs->dirty_db.find(ov);
-        if (dirty_it != bs->dirty_db.end() &&
-            IS_BIG_WRITE(dirty_it->second.state) &&
-            dirty_it->second.location == UINT64_MAX)
-        {
-            printf("Fatal error (bug): %lx:%lx v%lu big_write journal_entry was allocated over another object\n",
-                dirty_it->first.oid.inode, dirty_it->first.oid.stripe, dirty_it->first.version);
-            exit(1);
-        }
-    }
-    bs->flusher->mark_trim_possible();
+    // Trim journal on start so we don't stall when all entries are older
+    bs->journal.trim();
     bs->journal.dirty_start = bs->journal.next_free;
     printf(
         "Journal entries loaded: %lu, free journal space: %lu bytes (%08lx..%08lx is used), free blocks: %lu / %lu\n",
@@ -586,15 +454,10 @@ int blockstore_init_journal::handle_journal_part(void *buf, uint64_t done_pos, u
                     break;
                 }
             }
-            if (je->type == JE_SMALL_WRITE || je->type == JE_SMALL_WRITE_INSTANT)
+            if (je->type == JE_SMALL_WRITE)
             {
 #ifdef BLOCKSTORE_DEBUG
-                printf(
-                    "je_small_write%s oid=%lx:%lx ver=%lu offset=%u len=%u\n",
-                    je->type == JE_SMALL_WRITE_INSTANT ? "_instant" : "",
-                    je->small_write.oid.inode, je->small_write.oid.stripe, je->small_write.version,
-                    je->small_write.offset, je->small_write.len
-                );
+                printf("je_small_write oid=%lu:%lu ver=%lu offset=%u len=%u\n", je->small_write.oid.inode, je->small_write.oid.stripe, je->small_write.version, je->small_write.offset, je->small_write.len);
 #endif
                 // oid, version, offset, len
                 uint64_t prev_free = next_free;
@@ -664,77 +527,30 @@ int blockstore_init_journal::handle_journal_part(void *buf, uint64_t done_pos, u
                         .oid = je->small_write.oid,
                         .version = je->small_write.version,
                     };
-                    void *bmp = NULL;
-                    void *bmp_from = (void*)je + sizeof(journal_entry_small_write);
-                    if (bs->clean_entry_bitmap_size <= sizeof(void*))
-                    {
-                        memcpy(&bmp, bmp_from, bs->clean_entry_bitmap_size);
-                    }
-                    else
-                    {
-                        // FIXME Using large blockstore objects will result in a lot of small
-                        // allocations for entry bitmaps. This can only be fixed by using
-                        // a patched map with dynamic entry size, but not the btree_map,
-                        // because it doesn't keep iterators valid all the time.
-                        bmp = malloc_or_die(bs->clean_entry_bitmap_size);
-                        memcpy(bmp, bmp_from, bs->clean_entry_bitmap_size);
-                    }
                     bs->dirty_db.emplace(ov, (dirty_entry){
-                        .state = (BS_ST_SMALL_WRITE | BS_ST_SYNCED),
+                        .state = ST_J_SYNCED,
                         .flags = 0,
                         .location = location,
                         .offset = je->small_write.offset,
                         .len = je->small_write.len,
                         .journal_sector = proc_pos,
-                        .bitmap = bmp,
                     });
                     bs->journal.used_sectors[proc_pos]++;
 #ifdef BLOCKSTORE_DEBUG
                     printf(
-                        "journal offset %08lx is used by %lx:%lx v%lu (%lu refs)\n",
+                        "journal offset %08lx is used by %lu:%lu v%lu (%lu refs)\n",
                         proc_pos, ov.oid.inode, ov.oid.stripe, ov.version, bs->journal.used_sectors[proc_pos]
                     );
 #endif
                     auto & unstab = bs->unstable_writes[ov.oid];
                     unstab = unstab < ov.version ? ov.version : unstab;
-                    if (je->type == JE_SMALL_WRITE_INSTANT)
-                    {
-                        bs->mark_stable(ov, true);
-                    }
                 }
             }
-            else if (je->type == JE_BIG_WRITE || je->type == JE_BIG_WRITE_INSTANT)
+            else if (je->type == JE_BIG_WRITE)
             {
 #ifdef BLOCKSTORE_DEBUG
-                printf(
-                    "je_big_write%s oid=%lx:%lx ver=%lu loc=%lu\n",
-                    je->type == JE_BIG_WRITE_INSTANT ? "_instant" : "",
-                    je->big_write.oid.inode, je->big_write.oid.stripe, je->big_write.version, je->big_write.location >> bs->block_order
-                );
+                printf("je_big_write oid=%lu:%lu ver=%lu loc=%lu\n", je->big_write.oid.inode, je->big_write.oid.stripe, je->big_write.version, je->big_write.location);
 #endif
-                auto dirty_it = bs->dirty_db.upper_bound((obj_ver_id){
-                    .oid = je->big_write.oid,
-                    .version = UINT64_MAX,
-                });
-                if (dirty_it != bs->dirty_db.begin() && bs->dirty_db.size() > 0)
-                {
-                    dirty_it--;
-                    if (dirty_it->first.oid == je->big_write.oid &&
-                        dirty_it->first.version >= je->big_write.version &&
-                        (dirty_it->second.state & BS_ST_TYPE_MASK) == BS_ST_DELETE)
-                    {
-                        // It is allowed to overwrite a deleted object with a
-                        // version number smaller than deletion version number,
-                        // because the presence of a BIG_WRITE entry means that
-                        // its data and metadata are already flushed.
-                        // We don't know if newer versions are flushed, but
-                        // the previous delete definitely is.
-                        // So we forget previous dirty entries, but retain the clean one.
-                        // This feature is required for writes happening shortly
-                        // after deletes.
-                        erase_dirty_object(dirty_it);
-                    }
-                }
                 auto clean_it = bs->clean_db.find(je->big_write.oid);
                 if (clean_it == bs->clean_db.end() ||
                     clean_it->second.version < je->big_write.version)
@@ -744,80 +560,39 @@ int blockstore_init_journal::handle_journal_part(void *buf, uint64_t done_pos, u
                         .oid = je->big_write.oid,
                         .version = je->big_write.version,
                     };
-                    void *bmp = NULL;
-                    void *bmp_from = (void*)je + sizeof(journal_entry_big_write);
-                    if (bs->clean_entry_bitmap_size <= sizeof(void*))
-                    {
-                        memcpy(&bmp, bmp_from, bs->clean_entry_bitmap_size);
-                    }
-                    else
-                    {
-                        // FIXME Using large blockstore objects will result in a lot of small
-                        // allocations for entry bitmaps. This can only be fixed by using
-                        // a patched map with dynamic entry size, but not the btree_map,
-                        // because it doesn't keep iterators valid all the time.
-                        bmp = malloc_or_die(bs->clean_entry_bitmap_size);
-                        memcpy(bmp, bmp_from, bs->clean_entry_bitmap_size);
-                    }
-                    auto dirty_it = bs->dirty_db.emplace(ov, (dirty_entry){
-                        .state = (BS_ST_BIG_WRITE | BS_ST_SYNCED),
+                    bs->dirty_db.emplace(ov, (dirty_entry){
+                        .state = ST_D_SYNCED,
                         .flags = 0,
                         .location = je->big_write.location,
                         .offset = je->big_write.offset,
                         .len = je->big_write.len,
                         .journal_sector = proc_pos,
-                        .bitmap = bmp,
-                    }).first;
-                    if (bs->data_alloc->get(je->big_write.location >> bs->block_order))
-                    {
-                        // This is probably a big_write that's already flushed and freed, but it may
-                        // also indicate a bug. So we remember such entries and recheck them afterwards.
-                        // If it's not a bug they won't be present after reading the whole journal.
-                        dirty_it->second.location = UINT64_MAX;
-                        double_allocs.push_back(ov);
-                    }
-                    else
-                    {
+                    });
 #ifdef BLOCKSTORE_DEBUG
-                        printf(
-                            "Allocate block (journal) %lu: %lx:%lx v%lu\n",
-                            je->big_write.location >> bs->block_order,
-                            ov.oid.inode, ov.oid.stripe, ov.version
-                        );
+                    printf("Allocate block %lu\n", je->big_write.location >> bs->block_order);
 #endif
-                        bs->data_alloc->set(je->big_write.location >> bs->block_order, true);
-                    }
+                    bs->data_alloc->set(je->big_write.location >> bs->block_order, true);
                     bs->journal.used_sectors[proc_pos]++;
-#ifdef BLOCKSTORE_DEBUG
-                    printf(
-                        "journal offset %08lx is used by %lx:%lx v%lu (%lu refs)\n",
-                        proc_pos, ov.oid.inode, ov.oid.stripe, ov.version, bs->journal.used_sectors[proc_pos]
-                    );
-#endif
                     auto & unstab = bs->unstable_writes[ov.oid];
                     unstab = unstab < ov.version ? ov.version : unstab;
-                    if (je->type == JE_BIG_WRITE_INSTANT)
-                    {
-                        bs->mark_stable(ov, true);
-                    }
                 }
             }
             else if (je->type == JE_STABLE)
             {
 #ifdef BLOCKSTORE_DEBUG
-                printf("je_stable oid=%lx:%lx ver=%lu\n", je->stable.oid.inode, je->stable.oid.stripe, je->stable.version);
+                printf("je_stable oid=%lu:%lu ver=%lu\n", je->stable.oid.inode, je->stable.oid.stripe, je->stable.version);
 #endif
                 // oid, version
                 obj_ver_id ov = {
                     .oid = je->stable.oid,
                     .version = je->stable.version,
                 };
-                bs->mark_stable(ov, true);
+                bs->mark_stable(ov);
             }
             else if (je->type == JE_ROLLBACK)
             {
 #ifdef BLOCKSTORE_DEBUG
-                printf("je_rollback oid=%lx:%lx ver=%lu\n", je->rollback.oid.inode, je->rollback.oid.stripe, je->rollback.version);
+                printf("je_rollback oid=%lu:%lu ver=%lu\n", je->rollback.oid.inode, je->rollback.oid.stripe, je->rollback.version);
 #endif
                 // rollback dirty writes of <oid> up to <version>
                 obj_ver_id ov = {
@@ -829,28 +604,11 @@ int blockstore_init_journal::handle_journal_part(void *buf, uint64_t done_pos, u
             else if (je->type == JE_DELETE)
             {
 #ifdef BLOCKSTORE_DEBUG
-                printf("je_delete oid=%lx:%lx ver=%lu\n", je->del.oid.inode, je->del.oid.stripe, je->del.version);
+                printf("je_delete oid=%lu:%lu ver=%lu\n", je->del.oid.inode, je->del.oid.stripe, je->del.version);
 #endif
-                bool dirty_exists = false;
-                auto dirty_it = bs->dirty_db.upper_bound((obj_ver_id){
-                    .oid = je->del.oid,
-                    .version = UINT64_MAX,
-                });
-                if (dirty_it != bs->dirty_db.begin())
-                {
-                    dirty_it--;
-                    dirty_exists = dirty_it->first.oid == je->del.oid;
-                }
                 auto clean_it = bs->clean_db.find(je->del.oid);
-                bool clean_exists = (clean_it != bs->clean_db.end() &&
-                    clean_it->second.version < je->del.version);
-                if (!clean_exists && dirty_exists)
-                {
-                    // Clean entry doesn't exist. This means that the delete is already flushed.
-                    // So we must not flush this object anymore.
-                    erase_dirty_object(dirty_it);
-                }
-                else if (clean_exists || dirty_exists)
+                if (clean_it == bs->clean_db.end() ||
+                    clean_it->second.version < je->del.version)
                 {
                     // oid, version
                     obj_ver_id ov = {
@@ -858,7 +616,7 @@ int blockstore_init_journal::handle_journal_part(void *buf, uint64_t done_pos, u
                         .version = je->del.version,
                     };
                     bs->dirty_db.emplace(ov, (dirty_entry){
-                        .state = (BS_ST_DELETE | BS_ST_SYNCED),
+                        .state = ST_DEL_SYNCED,
                         .flags = 0,
                         .location = 0,
                         .offset = 0,
@@ -868,9 +626,8 @@ int blockstore_init_journal::handle_journal_part(void *buf, uint64_t done_pos, u
                     bs->journal.used_sectors[proc_pos]++;
                     // Deletions are treated as immediately stable, because
                     // "2-phase commit" (write->stabilize) isn't sufficient for them anyway
-                    bs->mark_stable(ov, true);
+                    bs->mark_stable(ov);
                 }
-                // Ignore delete if neither preceding dirty entries nor the clean one are present
             }
             started = true;
             pos += je->size;
@@ -881,35 +638,3 @@ int blockstore_init_journal::handle_journal_part(void *buf, uint64_t done_pos, u
     bs->journal.next_free = next_free;
     return 1;
 }
-
-void blockstore_init_journal::erase_dirty_object(blockstore_dirty_db_t::iterator dirty_it)
-{
-    auto oid = dirty_it->first.oid;
-    bool exists = !IS_DELETE(dirty_it->second.state);
-    auto dirty_end = dirty_it;
-    dirty_end++;
-    while (1)
-    {
-        if (dirty_it == bs->dirty_db.begin())
-        {
-            break;
-        }
-        dirty_it--;
-        if (dirty_it->first.oid != oid)
-        {
-            dirty_it++;
-            break;
-        }
-    }
-    auto clean_it = bs->clean_db.find(oid);
-    uint64_t clean_loc = clean_it != bs->clean_db.end()
-        ? clean_it->second.location : UINT64_MAX;
-    if (exists && clean_loc == UINT64_MAX)
-    {
-        bs->inode_space_stats[oid.inode] -= bs->block_size;
-    }
-    bs->erase_dirty(dirty_it, dirty_end, clean_loc);
-    // Remove it from the flusher's queue, too
-    // Otherwise it may end up referring to a small unstable write after reading the rest of the journal
-    bs->flusher->remove_flush(oid);
-}

blockstore_init.h

@@ -1,13 +1,9 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 (see README.md for details)
-
 #pragma once
 
 class blockstore_init_meta
 {
     blockstore_impl_t *bs;
     int wait_state = 0, wait_count = 0;
-    bool zero_on_init = false;
     void *metadata_buffer = NULL;
     uint64_t metadata_read = 0;
     int prev = 0, prev_done = 0, done_len = 0, submitted = 0;
@@ -37,7 +33,6 @@ class blockstore_init_journal
     bool started = false;
     uint64_t next_free;
     std::vector<bs_init_journal_done> done;
-    std::vector<obj_ver_id> double_allocs;
     uint64_t journal_pos = 0;
     uint64_t continue_pos = 0;
     void *init_write_buf = NULL;
@@ -50,7 +45,6 @@ class blockstore_init_journal
     std::function<void(ring_data_t*)> simple_callback;
     int handle_journal_part(void *buf, uint64_t done_pos, uint64_t len);
     void handle_event(ring_data_t *data);
-    void erase_dirty_object(blockstore_dirty_db_t::iterator dirty_it);
 public:
     blockstore_init_journal(blockstore_impl_t* bs);
     int loop();

blockstore_journal.cpp

@@ -1,12 +1,9 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 (see README.md for details)
-
 #include "blockstore_impl.h"
 
 blockstore_journal_check_t::blockstore_journal_check_t(blockstore_impl_t *bs)
 {
     this->bs = bs;
-    sectors_to_write = 0;
+    sectors_required = 0;
     next_pos = bs->journal.next_free;
     next_sector = bs->journal.cur_sector;
     first_sector = -1;
@@ -20,26 +17,21 @@ int blockstore_journal_check_t::check_available(blockstore_op_t *op, int entries
     int required = entries_required;
     while (1)
     {
-        int fits = bs->journal.no_same_sector_overwrites && next_pos == bs->journal.next_free && bs->journal.sector_info[next_sector].written
-            ? 0
-            : (bs->journal.block_size - next_in_pos) / size;
+        int fits = (bs->journal.block_size - next_in_pos) / size;
         if (fits > 0)
         {
-            if (fits > required)
-            {
-                fits = required;
-            }
             if (first_sector == -1)
             {
                 first_sector = next_sector;
             }
             required -= fits;
             next_in_pos += fits * size;
-            sectors_to_write++;
+            sectors_required++;
         }
         else if (bs->journal.sector_info[next_sector].dirty)
         {
-            sectors_to_write++;
+            // sectors_required is more like "sectors to write"
+            sectors_required++;
         }
         if (required <= 0)
         {
@@ -62,7 +54,7 @@ int blockstore_journal_check_t::check_available(blockstore_op_t *op, int entries
                 " is too small for a batch of "+std::to_string(entries_required)+" entries of "+std::to_string(size)+" bytes"
             );
         }
-        if (bs->journal.sector_info[next_sector].flush_count > 0 ||
+        if (bs->journal.sector_info[next_sector].usage_count > 0 ||
             bs->journal.sector_info[next_sector].dirty)
         {
             // No memory buffer available. Wait for it.
@@ -74,18 +66,17 @@ int blockstore_journal_check_t::check_available(blockstore_op_t *op, int entries
                     dirty++;
                     used++;
                 }
-                if (bs->journal.sector_info[i].flush_count > 0)
+                if (bs->journal.sector_info[i].usage_count > 0)
                 {
                     used++;
                 }
             }
             // In fact, it's even more rare than "ran out of journal space", so print a warning
             printf(
-                "Ran out of journal sector buffers: %d/%lu buffers used (%d dirty), next buffer (%ld)"
-                " is %s and flushed %lu times. Consider increasing \'journal_sector_buffer_count\'\n",
+                "Ran out of journal sector buffers: %d/%lu buffers used (%d dirty), next buffer (%ld) is %s and flushed %lu times\n",
                 used, bs->journal.sector_count, dirty, next_sector,
                 bs->journal.sector_info[next_sector].dirty ? "dirty" : "not dirty",
-                bs->journal.sector_info[next_sector].flush_count
+                bs->journal.sector_info[next_sector].usage_count
             );
             PRIV(op)->wait_for = WAIT_JOURNAL_BUFFER;
             return 0;
@@ -104,8 +95,10 @@ int blockstore_journal_check_t::check_available(blockstore_op_t *op, int entries
     {
         // No space in the journal. Wait until used_start changes.
         printf(
-            "Ran out of journal space (used_start=%08lx, next_free=%08lx, dirty_start=%08lx)\n",
-            bs->journal.used_start, bs->journal.next_free, bs->journal.dirty_start
+            "Ran out of journal space (free space: %lu bytes)\n",
+            (bs->journal.next_free >= bs->journal.used_start
+                ? bs->journal.len-bs->journal.block_size - (bs->journal.next_free-bs->journal.used_start)
+                : bs->journal.used_start - bs->journal.next_free)
         );
         PRIV(op)->wait_for = WAIT_JOURNAL;
         bs->flusher->request_trim();
@@ -117,21 +110,20 @@ int blockstore_journal_check_t::check_available(blockstore_op_t *op, int entries
 
 journal_entry* prefill_single_journal_entry(journal_t & journal, uint16_t type, uint32_t size)
 {
-    if (!journal.entry_fits(size))
+    if (journal.block_size - journal.in_sector_pos < size)
     {
         assert(!journal.sector_info[journal.cur_sector].dirty);
         // Move to the next journal sector
-        if (journal.sector_info[journal.cur_sector].flush_count > 0)
+        if (journal.sector_info[journal.cur_sector].usage_count > 0)
         {
             // Also select next sector buffer in memory
             journal.cur_sector = ((journal.cur_sector + 1) % journal.sector_count);
-            assert(!journal.sector_info[journal.cur_sector].flush_count);
+            assert(!journal.sector_info[journal.cur_sector].usage_count);
         }
         else
         {
             journal.dirty_start = journal.next_free;
         }
-        journal.sector_info[journal.cur_sector].written = false;
         journal.sector_info[journal.cur_sector].offset = journal.next_free;
         journal.in_sector_pos = 0;
         journal.next_free = (journal.next_free+journal.block_size) < journal.len ? journal.next_free + journal.block_size : journal.block_size;
@@ -156,8 +148,7 @@ journal_entry* prefill_single_journal_entry(journal_t & journal, uint16_t type,
 void prepare_journal_sector_write(journal_t & journal, int cur_sector, io_uring_sqe *sqe, std::function<void(ring_data_t*)> cb)
 {
     journal.sector_info[cur_sector].dirty = false;
-    journal.sector_info[cur_sector].written = true;
-    journal.sector_info[cur_sector].flush_count++;
+    journal.sector_info[cur_sector].usage_count++;
     ring_data_t *data = ((ring_data_t*)sqe->user_data);
     data->iov = (struct iovec){
         (journal.inmemory
@@ -184,7 +175,7 @@ journal_t::~journal_t()
     buffer = NULL;
 }
 
-uint64_t journal_t::get_trim_pos()
+bool journal_t::trim()
 {
     auto journal_used_it = used_sectors.lower_bound(used_start);
 #ifdef BLOCKSTORE_DEBUG
@@ -202,19 +193,26 @@ uint64_t journal_t::get_trim_pos()
         if (journal_used_it == used_sectors.end())
         {
             // Journal is empty
-            return next_free;
+            used_start = next_free;
         }
         else
         {
-            // next_free does not need updating during trim
-            return journal_used_it->first;
+            used_start = journal_used_it->first;
+            // next_free does not need updating here
         }
     }
     else if (journal_used_it->first > used_start)
     {
         // Journal is cleared up to <journal_used_it>
-        return journal_used_it->first;
+        used_start = journal_used_it->first;
     }
-    // Can't trim journal
-    return used_start;
+    else
+    {
+        // Can't trim journal
+        return false;
+    }
+#ifdef BLOCKSTORE_DEBUG
+    printf("Journal trimmed to %08lx (next_free=%08lx)\n", used_start, next_free);
+#endif
+    return true;
 }

blockstore_journal.h

@@ -1,18 +1,12 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 (see README.md for details)
-
 #pragma once
 
 #include "crc32c.h"
 
 #define MIN_JOURNAL_SIZE 4*1024*1024
 #define JOURNAL_MAGIC 0x4A33
-#define JOURNAL_VERSION 1
 #define JOURNAL_BUFFER_SIZE 4*1024*1024
 
 // We reserve some extra space for future stabilize requests during writes
-// FIXME: This value should be dynamic i.e. Blockstore ideally shouldn't allow
-// writing more than can be stabilized afterwards
 #define JOURNAL_STABILIZE_RESERVATION 65536
 
 // Journal entries
@@ -25,9 +19,7 @@
 #define JE_STABLE      0x04
 #define JE_DELETE      0x05
 #define JE_ROLLBACK    0x06
-#define JE_SMALL_WRITE_INSTANT 0x07
-#define JE_BIG_WRITE_INSTANT   0x08
-#define JE_MAX         0x08
+#define JE_MAX         0x06
 
 // crc32c comes first to ease calculation and is equal to crc32()
 struct __attribute__((__packed__)) journal_entry_start
@@ -38,9 +30,7 @@ struct __attribute__((__packed__)) journal_entry_start
     uint32_t size;
     uint32_t reserved;
     uint64_t journal_start;
-    uint64_t version;
 };
-#define JE_START_LEGACY_SIZE 24
 
 struct __attribute__((__packed__)) journal_entry_small_write
 {
@@ -57,9 +47,6 @@ struct __attribute__((__packed__)) journal_entry_small_write
     // data_offset is its offset within journal
     uint64_t data_offset;
     uint32_t crc32_data;
-    // small_write and big_write entries are followed by the "external" bitmap
-    // its size is dynamic and included in journal entry's <size> field
-    uint8_t bitmap[];
 };
 
 struct __attribute__((__packed__)) journal_entry_big_write
@@ -74,9 +61,6 @@ struct __attribute__((__packed__)) journal_entry_big_write
     uint32_t offset;
     uint32_t len;
     uint64_t location;
-    // small_write and big_write entries are followed by the "external" bitmap
-    // its size is dynamic and included in journal entry's <size> field
-    uint8_t bitmap[];
 };
 
 struct __attribute__((__packed__)) journal_entry_stable
@@ -142,8 +126,7 @@ inline uint32_t je_crc32(journal_entry *je)
 struct journal_sector_info_t
 {
     uint64_t offset;
-    uint64_t flush_count;
-    bool written;
+    uint64_t usage_count;
     bool dirty;
 };
 
@@ -152,7 +135,6 @@ struct journal_t
     int fd;
     uint64_t device_size;
     bool inmemory = false;
-    bool flush_journal = false;
     void *buffer = NULL;
 
     uint64_t block_size;
@@ -169,7 +151,6 @@ struct journal_t
     void *sector_buf = NULL;
     journal_sector_info_t *sector_info = NULL;
     uint64_t sector_count;
-    bool no_same_sector_overwrites = false;
     int cur_sector = 0;
     int in_sector_pos = 0;
 
@@ -179,19 +160,13 @@ struct journal_t
 
     ~journal_t();
     bool trim();
-    uint64_t get_trim_pos();
-    inline bool entry_fits(int size)
-    {
-        return !(block_size - in_sector_pos < size ||
-            no_same_sector_overwrites && sector_info[cur_sector].written);
-    }
 };
 
 struct blockstore_journal_check_t
 {
     blockstore_impl_t *bs;
     uint64_t next_pos, next_sector, next_in_pos;
-    int sectors_to_write, first_sector;
+    int sectors_required, first_sector;
     bool right_dir; // writing to the end or the beginning of the ring buffer
 
     blockstore_journal_check_t(blockstore_impl_t *bs);

blockstore_open.cpp

@@ -1,6 +1,3 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 (see README.md for details)
-
 #include <sys/file.h>
 #include "blockstore_impl.h"
 
@@ -42,11 +39,6 @@ void blockstore_impl_t::parse_config(blockstore_config_t & config)
     {
         disable_flock = true;
     }
-    if (config["flush_journal"] == "true" || config["flush_journal"] == "1" || config["flush_journal"] == "yes")
-    {
-        // Only flush journal and exit
-        journal.flush_journal = true;
-    }
     if (config["immediate_commit"] == "all")
     {
         immediate_commit = IMMEDIATE_ALL;
@@ -67,23 +59,12 @@ void blockstore_impl_t::parse_config(blockstore_config_t & config)
     journal_device = config["journal_device"];
     journal.offset = strtoull(config["journal_offset"].c_str(), NULL, 10);
     journal.sector_count = strtoull(config["journal_sector_buffer_count"].c_str(), NULL, 10);
-    journal.no_same_sector_overwrites = config["journal_no_same_sector_overwrites"] == "true" ||
-        config["journal_no_same_sector_overwrites"] == "1" || config["journal_no_same_sector_overwrites"] == "yes";
     journal.inmemory = config["inmemory_journal"] != "false";
     disk_alignment = strtoull(config["disk_alignment"].c_str(), NULL, 10);
     journal_block_size = strtoull(config["journal_block_size"].c_str(), NULL, 10);
     meta_block_size = strtoull(config["meta_block_size"].c_str(), NULL, 10);
     bitmap_granularity = strtoull(config["bitmap_granularity"].c_str(), NULL, 10);
-    max_flusher_count = strtoull(config["max_flusher_count"].c_str(), NULL, 10);
-    if (!max_flusher_count)
-        max_flusher_count = strtoull(config["flusher_count"].c_str(), NULL, 10);
-    min_flusher_count = strtoull(config["min_flusher_count"].c_str(), NULL, 10);
-    max_write_iodepth = strtoull(config["max_write_iodepth"].c_str(), NULL, 10);
-    throttle_small_writes = config["throttle_small_writes"] == "true" || config["throttle_small_writes"] == "1" || config["throttle_small_writes"] == "yes";
-    throttle_target_iops = strtoull(config["throttle_target_iops"].c_str(), NULL, 10);
-    throttle_target_mbs = strtoull(config["throttle_target_mbs"].c_str(), NULL, 10);
-    throttle_target_parallelism = strtoull(config["throttle_target_parallelism"].c_str(), NULL, 10);
-    throttle_threshold_us = strtoull(config["throttle_threshold_us"].c_str(), NULL, 10);
+    flusher_count = strtoull(config["flusher_count"].c_str(), NULL, 10);
     // Validate
     if (!block_size)
     {
@@ -93,17 +74,9 @@ void blockstore_impl_t::parse_config(blockstore_config_t & config)
     {
         throw std::runtime_error("Bad block size");
     }
-    if (!max_flusher_count)
+    if (!flusher_count)
     {
-        max_flusher_count = 256;
-    }
-    if (!min_flusher_count || journal.flush_journal)
-    {
-        min_flusher_count = 1;
-    }
-    if (!max_write_iodepth)
-    {
-        max_write_iodepth = 128;
+        flusher_count = 32;
     }
     if (!disk_alignment)
     {
@@ -111,7 +84,7 @@ void blockstore_impl_t::parse_config(blockstore_config_t & config)
     }
     else if (disk_alignment % MEM_ALIGNMENT)
     {
-        throw std::runtime_error("disk_alignment must be a multiple of "+std::to_string(MEM_ALIGNMENT));
+        throw std::runtime_error("disk_alingment must be a multiple of "+std::to_string(MEM_ALIGNMENT));
     }
     if (!journal_block_size)
     {
@@ -135,7 +108,7 @@ void blockstore_impl_t::parse_config(blockstore_config_t & config)
     }
     if (!bitmap_granularity)
     {
-        bitmap_granularity = DEFAULT_BITMAP_GRANULARITY;
+        bitmap_granularity = 4096;
     }
     else if (bitmap_granularity % disk_alignment)
     {
@@ -185,25 +158,9 @@ void blockstore_impl_t::parse_config(blockstore_config_t & config)
     {
         throw std::runtime_error("immediate_commit=all requires disable_journal_fsync and disable_data_fsync");
     }
-    if (!throttle_target_iops)
-    {
-        throttle_target_iops = 100;
-    }
-    if (!throttle_target_mbs)
-    {
-        throttle_target_mbs = 100;
-    }
-    if (!throttle_target_parallelism)
-    {
-        throttle_target_parallelism = 1;
-    }
-    if (!throttle_threshold_us)
-    {
-        throttle_threshold_us = 50;
-    }
     // init some fields
     clean_entry_bitmap_size = block_size / bitmap_granularity / 8;
-    clean_entry_size = sizeof(clean_disk_entry) + 2*clean_entry_bitmap_size;
+    clean_entry_size = sizeof(clean_disk_entry) + clean_entry_bitmap_size;
     journal.block_size = journal_block_size;
     journal.next_free = journal_block_size;
     journal.used_start = journal_block_size;
@@ -257,7 +214,7 @@ void blockstore_impl_t::calc_lengths()
     }
     // required metadata size
     block_count = data_len / block_size;
-    meta_len = (1 + (block_count - 1 + meta_block_size / clean_entry_size) / (meta_block_size / clean_entry_size)) * meta_block_size;
+    meta_len = ((block_count - 1 + meta_block_size / clean_entry_size) / (meta_block_size / clean_entry_size)) * meta_block_size;
     if (meta_area < meta_len)
     {
         throw std::runtime_error("Metadata area is too small, need at least "+std::to_string(meta_len)+" bytes");
@@ -270,7 +227,7 @@ void blockstore_impl_t::calc_lengths()
     }
     else if (clean_entry_bitmap_size)
     {
-        clean_bitmap = (uint8_t*)malloc(block_count * 2*clean_entry_bitmap_size);
+        clean_bitmap = (uint8_t*)malloc(block_count * clean_entry_bitmap_size);
         if (!clean_bitmap)
             throw std::runtime_error("Failed to allocate memory for the metadata sparse write bitmap");
     }

blockstore_read.cpp

@@ -1,6 +1,3 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 (see README.md for details)
-
 #include "blockstore_impl.h"
 
 int blockstore_impl_t::fulfill_read_push(blockstore_op_t *op, void *buf, uint64_t offset, uint64_t len,
@@ -40,7 +37,6 @@ int blockstore_impl_t::fulfill_read_push(blockstore_op_t *op, void *buf, uint64_
     return 1;
 }
 
-// FIXME I've seen a bug here so I want some tests
 int blockstore_impl_t::fulfill_read(blockstore_op_t *read_op, uint64_t &fulfilled, uint32_t item_start, uint32_t item_end,
     uint32_t item_state, uint64_t item_version, uint64_t item_location)
 {
@@ -53,20 +49,8 @@ int blockstore_impl_t::fulfill_read(blockstore_op_t *read_op, uint64_t &fulfille
         while (1)
         {
             for (; it != PRIV(read_op)->read_vec.end(); it++)
-            {
                 if (it->offset >= cur_start)
-                {
                     break;
-                }
-                else if (it->offset + it->len > cur_start)
-                {
-                    cur_start = it->offset + it->len;
-                    if (cur_start >= item_end)
-                    {
-                        goto endwhile;
-                    }
-                }
-            }
             if (it == PRIV(read_op)->read_vec.end() || it->offset > cur_start)
             {
                 fulfill_read_t el = {
@@ -85,30 +69,12 @@ int blockstore_impl_t::fulfill_read(blockstore_op_t *read_op, uint64_t &fulfille
             }
             cur_start = it->offset + it->len;
             if (it == PRIV(read_op)->read_vec.end() || cur_start >= item_end)
-            {
                 break;
-            }
         }
     }
-endwhile:
     return 1;
 }
 
-uint8_t* blockstore_impl_t::get_clean_entry_bitmap(uint64_t block_loc, int offset)
-{
-    uint8_t *clean_entry_bitmap;
-    uint64_t meta_loc = block_loc >> block_order;
-    if (inmemory_meta)
-    {
-        uint64_t sector = (meta_loc / (meta_block_size / clean_entry_size)) * meta_block_size;
-        uint64_t pos = (meta_loc % (meta_block_size / clean_entry_size));
-        clean_entry_bitmap = (uint8_t*)(metadata_buffer + sector + pos*clean_entry_size + sizeof(clean_disk_entry) + offset);
-    }
-    else
-        clean_entry_bitmap = (uint8_t*)(clean_bitmap + meta_loc*2*clean_entry_bitmap_size + offset);
-    return clean_entry_bitmap;
-}
-
 int blockstore_impl_t::dequeue_read(blockstore_op_t *read_op)
 {
     auto clean_it = clean_db.find(read_op->oid);
@@ -127,7 +93,7 @@ int blockstore_impl_t::dequeue_read(blockstore_op_t *read_op)
         read_op->version = 0;
         read_op->retval = read_op->len;
         FINISH_OP(read_op);
-        return 2;
+        return 1;
     }
     uint64_t fulfilled = 0;
     PRIV(read_op)->pending_ops = 0;
@@ -149,11 +115,6 @@ int blockstore_impl_t::dequeue_read(blockstore_op_t *read_op)
                 if (!result_version)
                 {
                     result_version = dirty_it->first.version;
-                    if (read_op->bitmap)
-                    {
-                        void *bmp_ptr = (clean_entry_bitmap_size > sizeof(void*) ? dirty_it->second.bitmap : &dirty_it->second.bitmap);
-                        memcpy(read_op->bitmap, bmp_ptr, clean_entry_bitmap_size);
-                    }
                 }
                 if (!fulfill_read(read_op, fulfilled, dirty.offset, dirty.offset + dirty.len,
                     dirty.state, dirty_it->first.version, dirty.location + (IS_JOURNAL(dirty.state) ? 0 : dirty.offset)))
@@ -175,17 +136,12 @@ int blockstore_impl_t::dequeue_read(blockstore_op_t *read_op)
         if (!result_version)
         {
             result_version = clean_it->second.version;
-            if (read_op->bitmap)
-            {
-                void *bmp_ptr = get_clean_entry_bitmap(clean_it->second.location, clean_entry_bitmap_size);
-                memcpy(read_op->bitmap, bmp_ptr, clean_entry_bitmap_size);
-            }
         }
         if (fulfilled < read_op->len)
         {
             if (!clean_entry_bitmap_size)
             {
-                if (!fulfill_read(read_op, fulfilled, 0, block_size, (BS_ST_BIG_WRITE | BS_ST_STABLE), 0, clean_it->second.location))
+                if (!fulfill_read(read_op, fulfilled, 0, block_size, ST_CURRENT, 0, clean_it->second.location))
                 {
                     // need to wait. undo added requests, don't dequeue op
                     PRIV(read_op)->read_vec.clear();
@@ -194,7 +150,18 @@ int blockstore_impl_t::dequeue_read(blockstore_op_t *read_op)
             }
             else
             {
-                uint8_t *clean_entry_bitmap = get_clean_entry_bitmap(clean_it->second.location, 0);
+                uint64_t meta_loc = clean_it->second.location >> block_order;
+                uint8_t *clean_entry_bitmap;
+                if (inmemory_meta)
+                {
+                    uint64_t sector = (meta_loc / (meta_block_size / clean_entry_size)) * meta_block_size;
+                    uint64_t pos = (meta_loc % (meta_block_size / clean_entry_size));
+                    clean_entry_bitmap = (uint8_t*)(metadata_buffer + sector + pos*clean_entry_size + sizeof(clean_disk_entry));
+                }
+                else
+                {
+                    clean_entry_bitmap = (uint8_t*)(clean_bitmap + meta_loc*clean_entry_bitmap_size);
+                }
                 uint64_t bmp_start = 0, bmp_end = 0, bmp_size = block_size/bitmap_granularity;
                 while (bmp_start < bmp_size)
                 {
@@ -205,8 +172,8 @@ int blockstore_impl_t::dequeue_read(blockstore_op_t *read_op)
                     if (bmp_end > bmp_start)
                     {
                         // fill with zeroes
-                        assert(fulfill_read(read_op, fulfilled, bmp_start * bitmap_granularity,
-                            bmp_end * bitmap_granularity, (BS_ST_DELETE | BS_ST_STABLE), 0, 0));
+                        fulfill_read(read_op, fulfilled, bmp_start * bitmap_granularity,
+                            bmp_end * bitmap_granularity, ST_DEL_STABLE, 0, 0);
                     }
                     bmp_start = bmp_end;
                     while (clean_entry_bitmap[bmp_end >> 3] & (1 << (bmp_end & 0x7)) && bmp_end < bmp_size)
@@ -216,8 +183,7 @@ int blockstore_impl_t::dequeue_read(blockstore_op_t *read_op)
                     if (bmp_end > bmp_start)
                     {
                         if (!fulfill_read(read_op, fulfilled, bmp_start * bitmap_granularity,
-                            bmp_end * bitmap_granularity, (BS_ST_BIG_WRITE | BS_ST_STABLE), 0,
-                            clean_it->second.location + bmp_start * bitmap_granularity))
+                            bmp_end * bitmap_granularity, ST_CURRENT, 0, clean_it->second.location + bmp_start * bitmap_granularity))
                         {
                             // need to wait. undo added requests, don't dequeue op
                             PRIV(read_op)->read_vec.clear();
@@ -232,7 +198,7 @@ int blockstore_impl_t::dequeue_read(blockstore_op_t *read_op)
     else if (fulfilled < read_op->len)
     {
         // fill remaining parts with zeroes
-        assert(fulfill_read(read_op, fulfilled, 0, block_size, (BS_ST_DELETE | BS_ST_STABLE), 0, 0));
+        fulfill_read(read_op, fulfilled, 0, block_size, ST_DEL_STABLE, 0, 0);
     }
     assert(fulfilled == read_op->len);
     read_op->version = result_version;
@@ -246,10 +212,10 @@ int blockstore_impl_t::dequeue_read(blockstore_op_t *read_op)
         }
         read_op->retval = read_op->len;
         FINISH_OP(read_op);
-        return 2;
+        return 1;
     }
     read_op->retval = 0;
-    return 2;
+    return 1;
 }
 
 void blockstore_impl_t::handle_read_event(ring_data_t *data, blockstore_op_t *op)
@@ -268,50 +234,3 @@ void blockstore_impl_t::handle_read_event(ring_data_t *data, blockstore_op_t *op
         FINISH_OP(op);
     }
 }
-
-int blockstore_impl_t::read_bitmap(object_id oid, uint64_t target_version, void *bitmap, uint64_t *result_version)
-{
-    auto dirty_it = dirty_db.upper_bound((obj_ver_id){
-        .oid = oid,
-        .version = UINT64_MAX,
-    });
-    if (dirty_it != dirty_db.begin())
-        dirty_it--;
-    if (dirty_it != dirty_db.end())
-    {
-        while (dirty_it->first.oid == oid)
-        {
-            if (target_version >= dirty_it->first.version)
-            {
-                if (result_version)
-                    *result_version = dirty_it->first.version;
-                if (bitmap)
-                {
-                    void *bmp_ptr = (clean_entry_bitmap_size > sizeof(void*) ? dirty_it->second.bitmap : &dirty_it->second.bitmap);
-                    memcpy(bitmap, bmp_ptr, clean_entry_bitmap_size);
-                }
-                return 0;
-            }
-            if (dirty_it == dirty_db.begin())
-                break;
-            dirty_it--;
-        }
-    }
-    auto clean_it = clean_db.find(oid);
-    if (clean_it != clean_db.end())
-    {
-        if (result_version)
-            *result_version = clean_it->second.version;
-        if (bitmap)
-        {
-            void *bmp_ptr = get_clean_entry_bitmap(clean_it->second.location, clean_entry_bitmap_size);
-            memcpy(bitmap, bmp_ptr, clean_entry_bitmap_size);
-        }
-        return 0;
-    }
-    if (result_version)
-        *result_version = 0;
-    if (bitmap)
-        memset(bitmap, 0, clean_entry_bitmap_size);
-    return -ENOENT;
-}

blockstore_rollback.cpp

@@ -1,6 +1,3 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 (see README.md for details)
-
 #include "blockstore_impl.h"
 
 int blockstore_impl_t::dequeue_rollback(blockstore_op_t *op)
@@ -9,14 +6,10 @@ int blockstore_impl_t::dequeue_rollback(blockstore_op_t *op)
     {
         return continue_rollback(op);
     }
-    obj_ver_id *v, *nv;
+    obj_ver_id* v;
     int i, todo = op->len;
-    for (i = 0, v = (obj_ver_id*)op->buf, nv = (obj_ver_id*)op->buf; i < op->len; i++, v++, nv++)
+    for (i = 0, v = (obj_ver_id*)op->buf; i < op->len; i++, v++)
     {
-        if (nv != v)
-        {
-            *nv = *v;
-        }
         // Check that there are some versions greater than v->version (which may be zero),
         // check that they're unstable, synced, and not currently written to
         auto dirty_it = dirty_db.lower_bound((obj_ver_id){
@@ -25,32 +18,31 @@ int blockstore_impl_t::dequeue_rollback(blockstore_op_t *op)
         });
         if (dirty_it == dirty_db.begin())
         {
-skip_ov:
-            // Already rolled back, skip this object version
-            todo--;
-            nv--;
-            continue;
+            if (v->version == 0)
+            {
+                // Already rolled back
+                // FIXME Skip this object version
+            }
+        bad_op:
+            op->retval = -ENOENT;
+            FINISH_OP(op);
+            return 1;
         }
         else
         {
             dirty_it--;
             if (dirty_it->first.oid != v->oid || dirty_it->first.version < v->version)
             {
-                goto skip_ov;
+                goto bad_op;
             }
             while (dirty_it->first.oid == v->oid && dirty_it->first.version > v->version)
             {
-                if (IS_IN_FLIGHT(dirty_it->second.state))
-                {
-                    // Object write is still in progress. Wait until the write request completes
-                    return 0;
-                }
-                else if (!IS_SYNCED(dirty_it->second.state) ||
+                if (!IS_SYNCED(dirty_it->second.state) ||
                     IS_STABLE(dirty_it->second.state))
                 {
                     op->retval = -EBUSY;
                     FINISH_OP(op);
-                    return 2;
+                    return 1;
                 }
                 if (dirty_it == dirty_db.begin())
                 {
@@ -60,14 +52,6 @@ skip_ov:
             }
         }
     }
-    op->len = todo;
-    if (!todo)
-    {
-        // Already rolled back
-        op->retval = 0;
-        FINISH_OP(op);
-        return 2;
-    }
     // Check journal space
     blockstore_journal_check_t space_check(this);
     if (!space_check.check_available(op, todo, sizeof(journal_entry_rollback), 0))
@@ -75,38 +59,43 @@ skip_ov:
         return 0;
     }
     // There is sufficient space. Get SQEs
-    struct io_uring_sqe *sqe[space_check.sectors_to_write];
-    for (i = 0; i < space_check.sectors_to_write; i++)
+    struct io_uring_sqe *sqe[space_check.sectors_required];
+    for (i = 0; i < space_check.sectors_required; i++)
     {
         BS_SUBMIT_GET_SQE_DECL(sqe[i]);
     }
     // Prepare and submit journal entries
     auto cb = [this, op](ring_data_t *data) { handle_rollback_event(data, op); };
     int s = 0, cur_sector = -1;
+    if ((journal_block_size - journal.in_sector_pos) < sizeof(journal_entry_rollback) &&
+        journal.sector_info[journal.cur_sector].dirty)
+    {
+        if (cur_sector == -1)
+            PRIV(op)->min_flushed_journal_sector = 1 + journal.cur_sector;
+        cur_sector = journal.cur_sector;
+        prepare_journal_sector_write(journal, cur_sector, sqe[s++], cb);
+    }
     for (i = 0, v = (obj_ver_id*)op->buf; i < op->len; i++, v++)
     {
-        if (!journal.entry_fits(sizeof(journal_entry_rollback)) &&
-            journal.sector_info[journal.cur_sector].dirty)
-        {
-            if (cur_sector == -1)
-                PRIV(op)->min_flushed_journal_sector = 1 + journal.cur_sector;
-            prepare_journal_sector_write(journal, journal.cur_sector, sqe[s++], cb);
-            cur_sector = journal.cur_sector;
-        }
         journal_entry_rollback *je = (journal_entry_rollback*)
             prefill_single_journal_entry(journal, JE_ROLLBACK, sizeof(journal_entry_rollback));
+        journal.sector_info[journal.cur_sector].dirty = false;
         je->oid = v->oid;
         je->version = v->version;
         je->crc32 = je_crc32((journal_entry*)je);
         journal.crc32_last = je->crc32;
+        if (cur_sector != journal.cur_sector)
+        {
+            if (cur_sector == -1)
+                PRIV(op)->min_flushed_journal_sector = 1 + journal.cur_sector;
+            cur_sector = journal.cur_sector;
+            prepare_journal_sector_write(journal, cur_sector, sqe[s++], cb);
+        }
     }
-    prepare_journal_sector_write(journal, journal.cur_sector, sqe[s++], cb);
-    assert(s == space_check.sectors_to_write);
-    if (cur_sector == -1)
-        PRIV(op)->min_flushed_journal_sector = 1 + journal.cur_sector;
     PRIV(op)->max_flushed_journal_sector = 1 + journal.cur_sector;
     PRIV(op)->pending_ops = s;
     PRIV(op)->op_state = 1;
+    inflight_writes++;
     return 1;
 }
 
@@ -126,8 +115,11 @@ resume_2:
 resume_3:
     if (!disable_journal_fsync)
     {
-        io_uring_sqe *sqe;
-        BS_SUBMIT_GET_SQE_DECL(sqe);
+        io_uring_sqe *sqe = get_sqe();
+        if (!sqe)
+        {
+            return 0;
+        }
         ring_data_t *data = ((ring_data_t*)sqe->user_data);
         my_uring_prep_fsync(sqe, journal.fd, IORING_FSYNC_DATASYNC);
         data->iov = { 0 };
@@ -144,11 +136,12 @@ resume_5:
     {
         mark_rolled_back(*v);
     }
-    flusher->mark_trim_possible();
+    journal.trim();
+    inflight_writes--;
     // Acknowledge op
     op->retval = 0;
     FINISH_OP(op);
-    return 2;
+    return 1;
 }
 
 void blockstore_impl_t::mark_rolled_back(const obj_ver_id & ov)
@@ -163,7 +156,10 @@ void blockstore_impl_t::mark_rolled_back(const obj_ver_id & ov)
         auto rm_start = it;
         auto rm_end = it;
         it--;
-        while (1)
+        while (it->first.oid == ov.oid &&
+            it->first.version > ov.version &&
+            !IS_IN_FLIGHT(it->second.state) &&
+            !IS_STABLE(it->second.state))
         {
             if (it->first.oid != ov.oid)
                 break;
@@ -173,7 +169,7 @@ void blockstore_impl_t::mark_rolled_back(const obj_ver_id & ov)
                     max_unstable = it->first.version;
                 break;
             }
-            else if (IS_IN_FLIGHT(it->second.state) || IS_STABLE(it->second.state))
+            else if (IS_STABLE(it->second.state))
                 break;
             // Remove entry
             rm_start = it;
@@ -184,14 +180,14 @@ void blockstore_impl_t::mark_rolled_back(const obj_ver_id & ov)
         if (rm_start != rm_end)
         {
             erase_dirty(rm_start, rm_end, UINT64_MAX);
-            auto unstab_it = unstable_writes.find(ov.oid);
-            if (unstab_it != unstable_writes.end())
-            {
-                if (max_unstable == 0)
-                    unstable_writes.erase(unstab_it);
-                else
-                    unstab_it->second = max_unstable;
-            }
+        }
+        auto unstab_it = unstable_writes.find(ov.oid);
+        if (unstab_it != unstable_writes.end())
+        {
+            if (max_unstable == 0)
+                unstable_writes.erase(unstab_it);
+            else
+                unstab_it->second = max_unstable;
         }
     }
 }
@@ -201,6 +197,7 @@ void blockstore_impl_t::handle_rollback_event(ring_data_t *data, blockstore_op_t
     live = true;
     if (data->res != data->iov.iov_len)
     {
+        inflight_writes--;
         throw std::runtime_error(
             "write operation failed ("+std::to_string(data->res)+" != "+std::to_string(data->iov.iov_len)+
             "). in-memory state is corrupted. AAAAAAAaaaaaaaaa!!!111"
@@ -210,57 +207,30 @@ void blockstore_impl_t::handle_rollback_event(ring_data_t *data, blockstore_op_t
     if (PRIV(op)->pending_ops == 0)
     {
         PRIV(op)->op_state++;
-        ringloop->wakeup();
+        if (!continue_rollback(op))
+        {
+            submit_queue.push_front(op);
+        }
     }
 }
 
 void blockstore_impl_t::erase_dirty(blockstore_dirty_db_t::iterator dirty_start, blockstore_dirty_db_t::iterator dirty_end, uint64_t clean_loc)
 {
-    if (dirty_end == dirty_start)
-    {
-        return;
-    }
     auto dirty_it = dirty_end;
-    dirty_it--;
-    if (IS_DELETE(dirty_it->second.state))
+    while (dirty_it != dirty_start)
     {
-        object_id oid = dirty_it->first.oid;
-#ifdef BLOCKSTORE_DEBUG
-        printf("Unblock writes-after-delete %lx:%lx v%lx\n", oid.inode, oid.stripe, dirty_it->first.version);
-#endif
-        dirty_it = dirty_end;
-        // Unblock operations blocked by delete flushing
-        uint32_t next_state = BS_ST_IN_FLIGHT;
-        while (dirty_it != dirty_db.end() && dirty_it->first.oid == oid)
-        {
-            if ((dirty_it->second.state & BS_ST_WORKFLOW_MASK) == BS_ST_WAIT_DEL)
-            {
-                dirty_it->second.state = (dirty_it->second.state & ~BS_ST_WORKFLOW_MASK) | next_state;
-                if (IS_BIG_WRITE(dirty_it->second.state))
-                {
-                    next_state = BS_ST_WAIT_BIG;
-                }
-            }
-            dirty_it++;
-        }
-        dirty_it = dirty_end;
         dirty_it--;
-    }
-    while (1)
-    {
-        if (IS_BIG_WRITE(dirty_it->second.state) && dirty_it->second.location != clean_loc &&
-            dirty_it->second.location != UINT64_MAX)
+        if (IS_BIG_WRITE(dirty_it->second.state) && dirty_it->second.location != clean_loc)
         {
 #ifdef BLOCKSTORE_DEBUG
-            printf("Free block %lu from %lx:%lx v%lu\n", dirty_it->second.location >> block_order,
-                dirty_it->first.oid.inode, dirty_it->first.oid.stripe, dirty_it->first.version);
+            printf("Free block %lu\n", dirty_it->second.location >> block_order);
 #endif
             data_alloc->set(dirty_it->second.location >> block_order, false);
         }
         int used = --journal.used_sectors[dirty_it->second.journal_sector];
 #ifdef BLOCKSTORE_DEBUG
         printf(
-            "remove usage of journal offset %08lx by %lx:%lx v%lu (%d refs)\n", dirty_it->second.journal_sector,
+            "remove usage of journal offset %08lx by %lu:%lu v%lu (%d refs)\n", dirty_it->second.journal_sector,
             dirty_it->first.oid.inode, dirty_it->first.oid.stripe, dirty_it->first.version, used
         );
 #endif
@@ -268,16 +238,6 @@ void blockstore_impl_t::erase_dirty(blockstore_dirty_db_t::iterator dirty_start,
         {
             journal.used_sectors.erase(dirty_it->second.journal_sector);
         }
-        if (clean_entry_bitmap_size > sizeof(void*))
-        {
-            free(dirty_it->second.bitmap);
-            dirty_it->second.bitmap = NULL;
-        }
-        if (dirty_it == dirty_start)
-        {
-            break;
-        }
-        dirty_it--;
     }
     dirty_db.erase(dirty_start, dirty_end);
 }

blockstore_stable.cpp

@@ -1,6 +1,3 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 (see README.md for details)
-
 #include "blockstore_impl.h"
 
 // Stabilize small write:
@@ -60,24 +57,19 @@ int blockstore_impl_t::dequeue_stable(blockstore_op_t *op)
                 // No such object version
                 op->retval = -ENOENT;
                 FINISH_OP(op);
-                return 2;
+                return 1;
             }
             else
             {
                 // Already stable
             }
         }
-        else if (IS_IN_FLIGHT(dirty_it->second.state))
-        {
-            // Object write is still in progress. Wait until the write request completes
-            return 0;
-        }
-        else if (!IS_SYNCED(dirty_it->second.state))
+        else if (IS_UNSYNCED(dirty_it->second.state))
         {
             // Object not synced yet. Caller must sync it first
             op->retval = -EBUSY;
             FINISH_OP(op);
-            return 2;
+            return 1;
         }
         else if (!IS_STABLE(dirty_it->second.state))
         {
@@ -89,7 +81,7 @@ int blockstore_impl_t::dequeue_stable(blockstore_op_t *op)
         // Already stable
         op->retval = 0;
         FINISH_OP(op);
-        return 2;
+        return 1;
     }
     // Check journal space
     blockstore_journal_check_t space_check(this);
@@ -98,39 +90,44 @@ int blockstore_impl_t::dequeue_stable(blockstore_op_t *op)
         return 0;
     }
     // There is sufficient space. Get SQEs
-    struct io_uring_sqe *sqe[space_check.sectors_to_write];
-    for (i = 0; i < space_check.sectors_to_write; i++)
+    struct io_uring_sqe *sqe[space_check.sectors_required];
+    for (i = 0; i < space_check.sectors_required; i++)
     {
         BS_SUBMIT_GET_SQE_DECL(sqe[i]);
     }
     // Prepare and submit journal entries
     auto cb = [this, op](ring_data_t *data) { handle_stable_event(data, op); };
     int s = 0, cur_sector = -1;
+    if ((journal_block_size - journal.in_sector_pos) < sizeof(journal_entry_stable) &&
+        journal.sector_info[journal.cur_sector].dirty)
+    {
+        if (cur_sector == -1)
+            PRIV(op)->min_flushed_journal_sector = 1 + journal.cur_sector;
+        cur_sector = journal.cur_sector;
+        prepare_journal_sector_write(journal, cur_sector, sqe[s++], cb);
+    }
     for (i = 0, v = (obj_ver_id*)op->buf; i < op->len; i++, v++)
     {
         // FIXME: Only stabilize versions that aren't stable yet
-        if (!journal.entry_fits(sizeof(journal_entry_stable)) &&
-            journal.sector_info[journal.cur_sector].dirty)
-        {
-            if (cur_sector == -1)
-                PRIV(op)->min_flushed_journal_sector = 1 + journal.cur_sector;
-            prepare_journal_sector_write(journal, journal.cur_sector, sqe[s++], cb);
-            cur_sector = journal.cur_sector;
-        }
         journal_entry_stable *je = (journal_entry_stable*)
             prefill_single_journal_entry(journal, JE_STABLE, sizeof(journal_entry_stable));
+        journal.sector_info[journal.cur_sector].dirty = false;
         je->oid = v->oid;
         je->version = v->version;
         je->crc32 = je_crc32((journal_entry*)je);
         journal.crc32_last = je->crc32;
+        if (cur_sector != journal.cur_sector)
+        {
+            if (cur_sector == -1)
+                PRIV(op)->min_flushed_journal_sector = 1 + journal.cur_sector;
+            cur_sector = journal.cur_sector;
+            prepare_journal_sector_write(journal, cur_sector, sqe[s++], cb);
+        }
     }
-    prepare_journal_sector_write(journal, journal.cur_sector, sqe[s++], cb);
-    assert(s == space_check.sectors_to_write);
-    if (cur_sector == -1)
-        PRIV(op)->min_flushed_journal_sector = 1 + journal.cur_sector;
     PRIV(op)->max_flushed_journal_sector = 1 + journal.cur_sector;
     PRIV(op)->pending_ops = s;
     PRIV(op)->op_state = 1;
+    inflight_writes++;
     return 1;
 }
 
@@ -150,8 +147,11 @@ resume_2:
 resume_3:
     if (!disable_journal_fsync)
     {
-        io_uring_sqe *sqe;
-        BS_SUBMIT_GET_SQE_DECL(sqe);
+        io_uring_sqe *sqe = get_sqe();
+        if (!sqe)
+        {
+            return 0;
+        }
         ring_data_t *data = ((ring_data_t*)sqe->user_data);
         my_uring_prep_fsync(sqe, journal.fd, IORING_FSYNC_DATASYNC);
         data->iov = { 0 };
@@ -168,77 +168,39 @@ resume_5:
     for (i = 0, v = (obj_ver_id*)op->buf; i < op->len; i++, v++)
     {
         // Mark all dirty_db entries up to op->version as stable
-#ifdef BLOCKSTORE_DEBUG
-        printf("Stabilize %lx:%lx v%lu\n", v->oid.inode, v->oid.stripe, v->version);
-#endif
         mark_stable(*v);
     }
+    inflight_writes--;
     // Acknowledge op
     op->retval = 0;
     FINISH_OP(op);
-    return 2;
+    return 1;
 }
 
-void blockstore_impl_t::mark_stable(const obj_ver_id & v, bool forget_dirty)
+void blockstore_impl_t::mark_stable(const obj_ver_id & v)
 {
     auto dirty_it = dirty_db.find(v);
     if (dirty_it != dirty_db.end())
     {
         while (1)
         {
-            bool was_stable = IS_STABLE(dirty_it->second.state);
-            if ((dirty_it->second.state & BS_ST_WORKFLOW_MASK) == BS_ST_SYNCED)
+            if (dirty_it->second.state == ST_J_SYNCED)
             {
-                dirty_it->second.state = (dirty_it->second.state & ~BS_ST_WORKFLOW_MASK) | BS_ST_STABLE;
-                // Allocations and deletions are counted when they're stabilized
-                if (IS_BIG_WRITE(dirty_it->second.state))
-                {
-                    int exists = -1;
-                    if (dirty_it != dirty_db.begin())
-                    {
-                        auto prev_it = dirty_it;
-                        prev_it--;
-                        if (prev_it->first.oid == v.oid)
-                        {
-                            exists = IS_DELETE(prev_it->second.state) ? 0 : 1;
-                        }
-                    }
-                    if (exists == -1)
-                    {
-                        auto clean_it = clean_db.find(v.oid);
-                        exists = clean_it != clean_db.end() ? 1 : 0;
-                    }
-                    if (!exists)
-                    {
-                        inode_space_stats[dirty_it->first.oid.inode] += block_size;
-                    }
-                }
-                else if (IS_DELETE(dirty_it->second.state))
-                {
-                    inode_space_stats[dirty_it->first.oid.inode] -= block_size;
-                }
+                dirty_it->second.state = ST_J_STABLE;
             }
-            if (forget_dirty && (IS_BIG_WRITE(dirty_it->second.state) ||
-                IS_DELETE(dirty_it->second.state)))
+            else if (dirty_it->second.state == ST_D_SYNCED)
+            {
+                dirty_it->second.state = ST_D_STABLE;
+            }
+            else if (dirty_it->second.state == ST_DEL_SYNCED)
+            {
+                dirty_it->second.state = ST_DEL_STABLE;
+            }
+            else if (IS_STABLE(dirty_it->second.state))
             {
-                // Big write overrides all previous dirty entries
-                auto erase_end = dirty_it;
-                while (dirty_it != dirty_db.begin())
-                {
-                    dirty_it--;
-                    if (dirty_it->first.oid != v.oid)
-                    {
-                        dirty_it++;
-                        break;
-                    }
-                }
-                auto clean_it = clean_db.find(v.oid);
-                uint64_t clean_loc = clean_it != clean_db.end()
-                    ? clean_it->second.location : UINT64_MAX;
-                erase_dirty(dirty_it, erase_end, clean_loc);
                 break;
             }
-            if (was_stable || dirty_it == dirty_db.begin())
+            if (dirty_it == dirty_db.begin())
             {
                 break;
             }
@@ -248,6 +210,9 @@ void blockstore_impl_t::mark_stable(const obj_ver_id & v, bool forget_dirty)
                 break;
             }
         }
+#ifdef BLOCKSTORE_DEBUG
+        printf("enqueue_flush %lu:%lu v%lu\n", v.oid.inode, v.oid.stripe, v.version);
+#endif
         flusher->enqueue_flush(v);
     }
     auto unstab_it = unstable_writes.find(v.oid);
@@ -263,6 +228,7 @@ void blockstore_impl_t::handle_stable_event(ring_data_t *data, blockstore_op_t *
     live = true;
     if (data->res != data->iov.iov_len)
     {
+        inflight_writes--;
         throw std::runtime_error(
             "write operation failed ("+std::to_string(data->res)+" != "+std::to_string(data->iov.iov_len)+
             "). in-memory state is corrupted. AAAAAAAaaaaaaaaa!!!111"
@@ -272,6 +238,9 @@ void blockstore_impl_t::handle_stable_event(ring_data_t *data, blockstore_op_t *
     if (PRIV(op)->pending_ops == 0)
     {
         PRIV(op)->op_state++;
-        ringloop->wakeup();
+        if (!continue_stable(op))
+        {
+            submit_queue.push_front(op);
+        }
     }
 }

blockstore_sync.cpp

@@ -1,6 +1,3 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 (see README.md for details)
-
 #include "blockstore_impl.h"
 
 #define SYNC_HAS_SMALL 1
@@ -12,19 +9,11 @@
 #define SYNC_JOURNAL_SYNC_SENT 7
 #define SYNC_DONE 8
 
-int blockstore_impl_t::continue_sync(blockstore_op_t *op, bool queue_has_in_progress_sync)
+int blockstore_impl_t::dequeue_sync(blockstore_op_t *op)
 {
-    if (immediate_commit == IMMEDIATE_ALL)
-    {
-        // We can return immediately because sync is only dequeued after all previous writes
-        op->retval = 0;
-        FINISH_OP(op);
-        return 2;
-    }
     if (PRIV(op)->op_state == 0)
     {
         stop_sync_submitted = false;
-        unsynced_big_write_count -= unsynced_big_writes.size();
         PRIV(op)->sync_big_writes.swap(unsynced_big_writes);
         PRIV(op)->sync_small_writes.swap(unsynced_small_writes);
         PRIV(op)->sync_small_checked = 0;
@@ -37,15 +26,34 @@ int blockstore_impl_t::continue_sync(blockstore_op_t *op, bool queue_has_in_prog
             PRIV(op)->op_state = SYNC_HAS_SMALL;
         else
             PRIV(op)->op_state = SYNC_DONE;
+        // Always add sync to in_progress_syncs because we clear unsynced_big_writes and unsynced_small_writes
+        PRIV(op)->prev_sync_count = in_progress_syncs.size();
+        PRIV(op)->in_progress_ptr = in_progress_syncs.insert(in_progress_syncs.end(), op);
     }
+    continue_sync(op);
+    // Always dequeue because we always add syncs to in_progress_syncs
+    return 1;
+}
+
+int blockstore_impl_t::continue_sync(blockstore_op_t *op)
+{
+    auto cb = [this, op](ring_data_t *data) { handle_sync_event(data, op); };
     if (PRIV(op)->op_state == SYNC_HAS_SMALL)
     {
         // No big writes, just fsync the journal
+        for (; PRIV(op)->sync_small_checked < PRIV(op)->sync_small_writes.size(); PRIV(op)->sync_small_checked++)
+        {
+            if (IS_IN_FLIGHT(dirty_db[PRIV(op)->sync_small_writes[PRIV(op)->sync_small_checked]].state))
+            {
+                // Wait for small inflight writes to complete
+                return 0;
+            }
+        }
         if (journal.sector_info[journal.cur_sector].dirty)
         {
             // Write out the last journal sector if it happens to be dirty
             BS_SUBMIT_GET_ONLY_SQE(sqe);
-            prepare_journal_sector_write(journal, journal.cur_sector, sqe, [this, op](ring_data_t *data) { handle_sync_event(data, op); });
+            prepare_journal_sector_write(journal, journal.cur_sector, sqe, cb);
             PRIV(op)->min_flushed_journal_sector = PRIV(op)->max_flushed_journal_sector = 1 + journal.cur_sector;
             PRIV(op)->pending_ops = 1;
             PRIV(op)->op_state = SYNC_JOURNAL_WRITE_SENT;
@@ -58,13 +66,21 @@ int blockstore_impl_t::continue_sync(blockstore_op_t *op, bool queue_has_in_prog
     }
     if (PRIV(op)->op_state == SYNC_HAS_BIG)
     {
+        for (; PRIV(op)->sync_big_checked < PRIV(op)->sync_big_writes.size(); PRIV(op)->sync_big_checked++)
+        {
+            if (IS_IN_FLIGHT(dirty_db[PRIV(op)->sync_big_writes[PRIV(op)->sync_big_checked]].state))
+            {
+                // Wait for big inflight writes to complete
+                return 0;
+            }
+        }
         // 1st step: fsync data
         if (!disable_data_fsync)
         {
             BS_SUBMIT_GET_SQE(sqe, data);
             my_uring_prep_fsync(sqe, data_fd, IORING_FSYNC_DATASYNC);
             data->iov = { 0 };
-            data->callback = [this, op](ring_data_t *data) { handle_sync_event(data, op); };
+            data->callback = cb;
             PRIV(op)->min_flushed_journal_sector = PRIV(op)->max_flushed_journal_sector = 0;
             PRIV(op)->pending_ops = 1;
             PRIV(op)->op_state = SYNC_DATA_SYNC_SENT;
@@ -77,62 +93,68 @@ int blockstore_impl_t::continue_sync(blockstore_op_t *op, bool queue_has_in_prog
     }
     if (PRIV(op)->op_state == SYNC_DATA_SYNC_DONE)
     {
+        for (; PRIV(op)->sync_small_checked < PRIV(op)->sync_small_writes.size(); PRIV(op)->sync_small_checked++)
+        {
+            if (IS_IN_FLIGHT(dirty_db[PRIV(op)->sync_small_writes[PRIV(op)->sync_small_checked]].state))
+            {
+                // Wait for small inflight writes to complete
+                return 0;
+            }
+        }
         // 2nd step: Data device is synced, prepare & write journal entries
         // Check space in the journal and journal memory buffers
         blockstore_journal_check_t space_check(this);
-        if (!space_check.check_available(op, PRIV(op)->sync_big_writes.size(),
-            sizeof(journal_entry_big_write) + clean_entry_bitmap_size, JOURNAL_STABILIZE_RESERVATION))
+        if (!space_check.check_available(op, PRIV(op)->sync_big_writes.size(), sizeof(journal_entry_big_write), 0))
         {
             return 0;
         }
         // Get SQEs. Don't bother about merging, submit each journal sector as a separate request
-        struct io_uring_sqe *sqe[space_check.sectors_to_write];
-        for (int i = 0; i < space_check.sectors_to_write; i++)
+        struct io_uring_sqe *sqe[space_check.sectors_required];
+        for (int i = 0; i < space_check.sectors_required; i++)
         {
             BS_SUBMIT_GET_SQE_DECL(sqe[i]);
         }
         // Prepare and submit journal entries
         auto it = PRIV(op)->sync_big_writes.begin();
         int s = 0, cur_sector = -1;
+        if ((journal_block_size - journal.in_sector_pos) < sizeof(journal_entry_big_write) &&
+            journal.sector_info[journal.cur_sector].dirty)
+        {
+            if (cur_sector == -1)
+                PRIV(op)->min_flushed_journal_sector = 1 + journal.cur_sector;
+            cur_sector = journal.cur_sector;
+            prepare_journal_sector_write(journal, cur_sector, sqe[s++], cb);
+        }
         while (it != PRIV(op)->sync_big_writes.end())
         {
-            if (!journal.entry_fits(sizeof(journal_entry_big_write) + clean_entry_bitmap_size) &&
-                journal.sector_info[journal.cur_sector].dirty)
-            {
-                if (cur_sector == -1)
-                    PRIV(op)->min_flushed_journal_sector = 1 + journal.cur_sector;
-                prepare_journal_sector_write(journal, journal.cur_sector, sqe[s++], [this, op](ring_data_t *data) { handle_sync_event(data, op); });
-                cur_sector = journal.cur_sector;
-            }
-            auto & dirty_entry = dirty_db.at(*it);
-            journal_entry_big_write *je = (journal_entry_big_write*)prefill_single_journal_entry(
-                journal, (dirty_entry.state & BS_ST_INSTANT) ? JE_BIG_WRITE_INSTANT : JE_BIG_WRITE,
-                sizeof(journal_entry_big_write) + clean_entry_bitmap_size
-            );
-            dirty_entry.journal_sector = journal.sector_info[journal.cur_sector].offset;
+            journal_entry_big_write *je = (journal_entry_big_write*)
+                prefill_single_journal_entry(journal, JE_BIG_WRITE, sizeof(journal_entry_big_write));
+            dirty_db[*it].journal_sector = journal.sector_info[journal.cur_sector].offset;
+            journal.sector_info[journal.cur_sector].dirty = false;
             journal.used_sectors[journal.sector_info[journal.cur_sector].offset]++;
 #ifdef BLOCKSTORE_DEBUG
             printf(
-                "journal offset %08lx is used by %lx:%lx v%lu (%lu refs)\n",
-                dirty_entry.journal_sector, it->oid.inode, it->oid.stripe, it->version,
+                "journal offset %08lx is used by %lu:%lu v%lu (%lu refs)\n",
+                dirty_db[*it].journal_sector, it->oid.inode, it->oid.stripe, it->version,
                 journal.used_sectors[journal.sector_info[journal.cur_sector].offset]
             );
 #endif
             je->oid = it->oid;
             je->version = it->version;
-            je->offset = dirty_entry.offset;
-            je->len = dirty_entry.len;
-            je->location = dirty_entry.location;
-            memcpy((void*)(je+1), (clean_entry_bitmap_size > sizeof(void*)
-                ? dirty_entry.bitmap : &dirty_entry.bitmap), clean_entry_bitmap_size);
+            je->offset = dirty_db[*it].offset;
+            je->len = dirty_db[*it].len;
+            je->location = dirty_db[*it].location;
             je->crc32 = je_crc32((journal_entry*)je);
             journal.crc32_last = je->crc32;
             it++;
+            if (cur_sector != journal.cur_sector)
+            {
+                if (cur_sector == -1)
+                    PRIV(op)->min_flushed_journal_sector = 1 + journal.cur_sector;
+                cur_sector = journal.cur_sector;
+                prepare_journal_sector_write(journal, cur_sector, sqe[s++], cb);
+            }
         }
-        prepare_journal_sector_write(journal, journal.cur_sector, sqe[s++], [this, op](ring_data_t *data) { handle_sync_event(data, op); });
-        assert(s == space_check.sectors_to_write);
-        if (cur_sector == -1)
-            PRIV(op)->min_flushed_journal_sector = 1 + journal.cur_sector;
         PRIV(op)->max_flushed_journal_sector = 1 + journal.cur_sector;
         PRIV(op)->pending_ops = s;
         PRIV(op)->op_state = SYNC_JOURNAL_WRITE_SENT;
@@ -145,8 +167,7 @@ int blockstore_impl_t::continue_sync(blockstore_op_t *op, bool queue_has_in_prog
             BS_SUBMIT_GET_SQE(sqe, data);
             my_uring_prep_fsync(sqe, journal.fd, IORING_FSYNC_DATASYNC);
             data->iov = { 0 };
-            data->callback = [this, op](ring_data_t *data) { handle_sync_event(data, op); };
-            PRIV(op)->min_flushed_journal_sector = PRIV(op)->max_flushed_journal_sector = 0;
+            data->callback = cb;
             PRIV(op)->pending_ops = 1;
             PRIV(op)->op_state = SYNC_JOURNAL_SYNC_SENT;
             return 1;
@@ -156,10 +177,9 @@ int blockstore_impl_t::continue_sync(blockstore_op_t *op, bool queue_has_in_prog
             PRIV(op)->op_state = SYNC_DONE;
         }
     }
-    if (PRIV(op)->op_state == SYNC_DONE && !queue_has_in_progress_sync)
+    if (PRIV(op)->op_state == SYNC_DONE)
     {
-        ack_sync(op);
-        return 2;
+        return ack_sync(op);
     }
     return 1;
 }
@@ -191,37 +211,59 @@ void blockstore_impl_t::handle_sync_event(ring_data_t *data, blockstore_op_t *op
         else if (PRIV(op)->op_state == SYNC_JOURNAL_SYNC_SENT)
         {
             PRIV(op)->op_state = SYNC_DONE;
+            ack_sync(op);
         }
         else
         {
             throw std::runtime_error("BUG: unexpected sync op state");
         }
-        ringloop->wakeup();
     }
 }
 
-void blockstore_impl_t::ack_sync(blockstore_op_t *op)
+int blockstore_impl_t::ack_sync(blockstore_op_t *op)
+{
+    if (PRIV(op)->op_state == SYNC_DONE && PRIV(op)->prev_sync_count == 0)
+    {
+        // Remove dependency of subsequent syncs
+        auto it = PRIV(op)->in_progress_ptr;
+        int done_syncs = 1;
+        ++it;
+        // Acknowledge sync
+        ack_one_sync(op);
+        while (it != in_progress_syncs.end())
+        {
+            auto & next_sync = *it++;
+            PRIV(next_sync)->prev_sync_count -= done_syncs;
+            if (PRIV(next_sync)->prev_sync_count == 0 && PRIV(next_sync)->op_state == SYNC_DONE)
+            {
+                done_syncs++;
+                // Acknowledge next_sync
+                ack_one_sync(next_sync);
+            }
+        }
+        return 2;
+    }
+    return 0;
+}
+
+void blockstore_impl_t::ack_one_sync(blockstore_op_t *op)
 {
     // Handle states
     for (auto it = PRIV(op)->sync_big_writes.begin(); it != PRIV(op)->sync_big_writes.end(); it++)
     {
 #ifdef BLOCKSTORE_DEBUG
-        printf("Ack sync big %lx:%lx v%lu\n", it->oid.inode, it->oid.stripe, it->version);
+        printf("Ack sync big %lu:%lu v%lu\n", it->oid.inode, it->oid.stripe, it->version);
 #endif
         auto & unstab = unstable_writes[it->oid];
         unstab = unstab < it->version ? it->version : unstab;
         auto dirty_it = dirty_db.find(*it);
-        dirty_it->second.state = ((dirty_it->second.state & ~BS_ST_WORKFLOW_MASK) | BS_ST_SYNCED);
-        if (dirty_it->second.state & BS_ST_INSTANT)
-        {
-            mark_stable(dirty_it->first);
-        }
+        dirty_it->second.state = ST_D_SYNCED;
         dirty_it++;
         while (dirty_it != dirty_db.end() && dirty_it->first.oid == it->oid)
         {
-            if ((dirty_it->second.state & BS_ST_WORKFLOW_MASK) == BS_ST_WAIT_BIG)
+            if (dirty_it->second.state == ST_J_WAIT_BIG)
             {
-                dirty_it->second.state = (dirty_it->second.state & ~BS_ST_WORKFLOW_MASK) | BS_ST_IN_FLIGHT;
+                dirty_it->second.state = ST_J_IN_FLIGHT;
             }
             dirty_it++;
         }
@@ -229,25 +271,22 @@ void blockstore_impl_t::ack_sync(blockstore_op_t *op)
     for (auto it = PRIV(op)->sync_small_writes.begin(); it != PRIV(op)->sync_small_writes.end(); it++)
     {
 #ifdef BLOCKSTORE_DEBUG
-        printf("Ack sync small %lx:%lx v%lu\n", it->oid.inode, it->oid.stripe, it->version);
+        printf("Ack sync small %lu:%lu v%lu\n", it->oid.inode, it->oid.stripe, it->version);
 #endif
         auto & unstab = unstable_writes[it->oid];
         unstab = unstab < it->version ? it->version : unstab;
-        if (dirty_db[*it].state == (BS_ST_DELETE | BS_ST_WRITTEN))
+        if (dirty_db[*it].state == ST_DEL_WRITTEN)
         {
-            dirty_db[*it].state = (BS_ST_DELETE | BS_ST_SYNCED);
+            dirty_db[*it].state = ST_DEL_SYNCED;
             // Deletions are treated as immediately stable
             mark_stable(*it);
         }
-        else /* (BS_ST_INSTANT?) | BS_ST_SMALL_WRITE | BS_ST_WRITTEN */
+        else /* == ST_J_WRITTEN */
         {
-            dirty_db[*it].state = (dirty_db[*it].state & ~BS_ST_WORKFLOW_MASK) | BS_ST_SYNCED;
-            if (dirty_db[*it].state & BS_ST_INSTANT)
-            {
-                mark_stable(*it);
-            }
+            dirty_db[*it].state = ST_J_SYNCED;
         }
     }
+    in_progress_syncs.erase(PRIV(op)->in_progress_ptr);
     op->retval = 0;
     FINISH_OP(op);
 }

blockstore_write.cpp

@@ -0,0 +1,512 @@
+#include "blockstore_impl.h"
+
+bool blockstore_impl_t::enqueue_write(blockstore_op_t *op)
+{
+    // Check or assign version number
+    bool found = false, deleted = false, is_del = (op->opcode == BS_OP_DELETE);
+    bool is_inflight_big = false;
+    uint64_t version = 1;
+    if (dirty_db.size() > 0)
+    {
+        auto dirty_it = dirty_db.upper_bound((obj_ver_id){
+            .oid = op->oid,
+            .version = UINT64_MAX,
+        });
+        dirty_it--; // segfaults when dirty_db is empty
+        if (dirty_it != dirty_db.end() && dirty_it->first.oid == op->oid)
+        {
+            found = true;
+            version = dirty_it->first.version + 1;
+            deleted = IS_DELETE(dirty_it->second.state);
+            is_inflight_big = dirty_it->second.state >= ST_D_IN_FLIGHT &&
+                dirty_it->second.state < ST_D_SYNCED ||
+                dirty_it->second.state == ST_J_WAIT_BIG;
+        }
+    }
+    if (!found)
+    {
+        auto clean_it = clean_db.find(op->oid);
+        if (clean_it != clean_db.end())
+        {
+            version = clean_it->second.version + 1;
+        }
+        else
+        {
+            deleted = true;
+        }
+    }
+    if (op->version == 0)
+    {
+        op->version = version;
+    }
+    else if (op->version < version)
+    {
+        // Invalid version requested
+        op->retval = -EEXIST;
+        return false;
+    }
+    if (deleted && is_del)
+    {
+        // Already deleted
+        op->retval = 0;
+        return false;
+    }
+    if (is_inflight_big && !is_del && !deleted && op->len < block_size &&
+        immediate_commit != IMMEDIATE_ALL)
+    {
+        // Issue an additional sync so that the previous big write can reach the journal
+        blockstore_op_t *sync_op = new blockstore_op_t;
+        sync_op->opcode = BS_OP_SYNC;
+        sync_op->callback = [this, op](blockstore_op_t *sync_op)
+        {
+            delete sync_op;
+        };
+        enqueue_op(sync_op);
+    }
+#ifdef BLOCKSTORE_DEBUG
+    if (is_del)
+        printf("Delete %lu:%lu v%lu\n", op->oid.inode, op->oid.stripe, op->version);
+    else
+        printf("Write %lu:%lu v%lu offset=%u len=%u\n", op->oid.inode, op->oid.stripe, op->version, op->offset, op->len);
+#endif
+    // No strict need to add it into dirty_db here, it's just left
+    // from the previous implementation where reads waited for writes
+    dirty_db.emplace((obj_ver_id){
+        .oid = op->oid,
+        .version = op->version,
+    }, (dirty_entry){
+        .state = (uint32_t)(
+            is_del
+                ? ST_DEL_IN_FLIGHT
+                : (op->len == block_size || deleted ? ST_D_IN_FLIGHT : (is_inflight_big ? ST_J_WAIT_BIG : ST_J_IN_FLIGHT))
+        ),
+        .flags = 0,
+        .location = 0,
+        .offset = is_del ? 0 : op->offset,
+        .len = is_del ? 0 : op->len,
+        .journal_sector = 0,
+    });
+    return true;
+}
+
+// First step of the write algorithm: dequeue operation and submit initial write(s)
+int blockstore_impl_t::dequeue_write(blockstore_op_t *op)
+{
+    if (PRIV(op)->op_state)
+    {
+        return continue_write(op);
+    }
+    auto dirty_it = dirty_db.find((obj_ver_id){
+        .oid = op->oid,
+        .version = op->version,
+    });
+    assert(dirty_it != dirty_db.end());
+    if (dirty_it->second.state == ST_J_WAIT_BIG)
+    {
+        return 0;
+    }
+    else if (dirty_it->second.state == ST_D_IN_FLIGHT)
+    {
+        blockstore_journal_check_t space_check(this);
+        if (!space_check.check_available(op, unsynced_big_writes.size() + 1, sizeof(journal_entry_big_write), JOURNAL_STABILIZE_RESERVATION))
+        {
+            return 0;
+        }
+        // Big (redirect) write
+        uint64_t loc = data_alloc->find_free();
+        if (loc == UINT64_MAX)
+        {
+            // no space
+            if (flusher->is_active())
+            {
+                // hope that some space will be available after flush
+                PRIV(op)->wait_for = WAIT_FREE;
+                return 0;
+            }
+            op->retval = -ENOSPC;
+            FINISH_OP(op);
+            return 1;
+        }
+        BS_SUBMIT_GET_SQE(sqe, data);
+        dirty_it->second.location = loc << block_order;
+        dirty_it->second.state = ST_D_SUBMITTED;
+#ifdef BLOCKSTORE_DEBUG
+        printf("Allocate block %lu\n", loc);
+#endif
+        data_alloc->set(loc, true);
+        uint64_t stripe_offset = (op->offset % bitmap_granularity);
+        uint64_t stripe_end = (op->offset + op->len) % bitmap_granularity;
+        // Zero fill up to bitmap_granularity
+        int vcnt = 0;
+        if (stripe_offset)
+        {
+            PRIV(op)->iov_zerofill[vcnt++] = (struct iovec){ zero_object, stripe_offset };
+        }
+        PRIV(op)->iov_zerofill[vcnt++] = (struct iovec){ op->buf, op->len };
+        if (stripe_end)
+        {
+            stripe_end = bitmap_granularity - stripe_end;
+            PRIV(op)->iov_zerofill[vcnt++] = (struct iovec){ zero_object, stripe_end };
+        }
+        data->iov.iov_len = op->len + stripe_offset + stripe_end; // to check it in the callback
+        data->callback = [this, op](ring_data_t *data) { handle_write_event(data, op); };
+        my_uring_prep_writev(
+            sqe, data_fd, PRIV(op)->iov_zerofill, vcnt, data_offset + (loc << block_order) + op->offset - stripe_offset
+        );
+        PRIV(op)->pending_ops = 1;
+        PRIV(op)->min_flushed_journal_sector = PRIV(op)->max_flushed_journal_sector = 0;
+        if (immediate_commit != IMMEDIATE_ALL)
+        {
+            // Remember big write as unsynced
+            unsynced_big_writes.push_back((obj_ver_id){
+                .oid = op->oid,
+                .version = op->version,
+            });
+            PRIV(op)->op_state = 3;
+        }
+        else
+        {
+            PRIV(op)->op_state = 1;
+        }
+    }
+    else
+    {
+        // Small (journaled) write
+        // First check if the journal has sufficient space
+        blockstore_journal_check_t space_check(this);
+        if (unsynced_big_writes.size() && !space_check.check_available(op, unsynced_big_writes.size(), sizeof(journal_entry_big_write), 0)
+            || !space_check.check_available(op, 1, sizeof(journal_entry_small_write), op->len + JOURNAL_STABILIZE_RESERVATION))
+        {
+            return 0;
+        }
+        // There is sufficient space. Get SQE(s)
+        struct io_uring_sqe *sqe1 = NULL;
+        if (immediate_commit != IMMEDIATE_NONE ||
+            (journal_block_size - journal.in_sector_pos) < sizeof(journal_entry_small_write) &&
+            journal.sector_info[journal.cur_sector].dirty)
+        {
+            // Write current journal sector only if it's dirty and full, or in the immediate_commit mode
+            BS_SUBMIT_GET_SQE_DECL(sqe1);
+        }
+        struct io_uring_sqe *sqe2 = NULL;
+        if (op->len > 0)
+        {
+            BS_SUBMIT_GET_SQE_DECL(sqe2);
+        }
+        // Got SQEs. Prepare previous journal sector write if required
+        auto cb = [this, op](ring_data_t *data) { handle_write_event(data, op); };
+        if (immediate_commit == IMMEDIATE_NONE)
+        {
+            if (sqe1)
+            {
+                prepare_journal_sector_write(journal, journal.cur_sector, sqe1, cb);
+                PRIV(op)->min_flushed_journal_sector = PRIV(op)->max_flushed_journal_sector = 1 + journal.cur_sector;
+                PRIV(op)->pending_ops++;
+            }
+            else
+            {
+                PRIV(op)->min_flushed_journal_sector = PRIV(op)->max_flushed_journal_sector = 0;
+            }
+        }
+        // Then pre-fill journal entry
+        journal_entry_small_write *je = (journal_entry_small_write*)
+            prefill_single_journal_entry(journal, JE_SMALL_WRITE, sizeof(journal_entry_small_write));
+        dirty_it->second.journal_sector = journal.sector_info[journal.cur_sector].offset;
+        journal.used_sectors[journal.sector_info[journal.cur_sector].offset]++;
+#ifdef BLOCKSTORE_DEBUG
+        printf(
+            "journal offset %08lx is used by %lu:%lu v%lu (%lu refs)\n",
+            dirty_it->second.journal_sector, dirty_it->first.oid.inode, dirty_it->first.oid.stripe, dirty_it->first.version,
+            journal.used_sectors[journal.sector_info[journal.cur_sector].offset]
+        );
+#endif
+        // Figure out where data will be
+        journal.next_free = (journal.next_free + op->len) <= journal.len ? journal.next_free : journal_block_size;
+        je->oid = op->oid;
+        je->version = op->version;
+        je->offset = op->offset;
+        je->len = op->len;
+        je->data_offset = journal.next_free;
+        je->crc32_data = crc32c(0, op->buf, op->len);
+        je->crc32 = je_crc32((journal_entry*)je);
+        journal.crc32_last = je->crc32;
+        if (immediate_commit != IMMEDIATE_NONE)
+        {
+            prepare_journal_sector_write(journal, journal.cur_sector, sqe1, cb);
+            PRIV(op)->min_flushed_journal_sector = PRIV(op)->max_flushed_journal_sector = 1 + journal.cur_sector;
+            PRIV(op)->pending_ops++;
+        }
+        if (op->len > 0)
+        {
+            // Prepare journal data write
+            if (journal.inmemory)
+            {
+                // Copy data
+                memcpy(journal.buffer + journal.next_free, op->buf, op->len);
+            }
+            ring_data_t *data2 = ((ring_data_t*)sqe2->user_data);
+            data2->iov = (struct iovec){ op->buf, op->len };
+            data2->callback = cb;
+            my_uring_prep_writev(
+                sqe2, journal.fd, &data2->iov, 1, journal.offset + journal.next_free
+            );
+            PRIV(op)->pending_ops++;
+        }
+        else
+        {
+            // Zero-length overwrite. Allowed to bump object version in EC placement groups without actually writing data
+        }
+        dirty_it->second.location = journal.next_free;
+        dirty_it->second.state = ST_J_SUBMITTED;
+        journal.next_free += op->len;
+        if (journal.next_free >= journal.len)
+        {
+            journal.next_free = journal_block_size;
+        }
+        if (immediate_commit == IMMEDIATE_NONE)
+        {
+            // Remember small write as unsynced
+            unsynced_small_writes.push_back((obj_ver_id){
+                .oid = op->oid,
+                .version = op->version,
+            });
+        }
+        if (!PRIV(op)->pending_ops)
+        {
+            PRIV(op)->op_state = 4;
+            continue_write(op);
+        }
+        else
+        {
+            PRIV(op)->op_state = 3;
+        }
+    }
+    inflight_writes++;
+    return 1;
+}
+
+int blockstore_impl_t::continue_write(blockstore_op_t *op)
+{
+    io_uring_sqe *sqe = NULL;
+    journal_entry_big_write *je;
+    auto dirty_it = dirty_db.find((obj_ver_id){
+        .oid = op->oid,
+        .version = op->version,
+    });
+    assert(dirty_it != dirty_db.end());
+    if (PRIV(op)->op_state == 2)
+        goto resume_2;
+    else if (PRIV(op)->op_state == 4)
+        goto resume_4;
+    else
+        return 1;
+resume_2:
+    // Only for the immediate_commit mode: prepare and submit big_write journal entry
+    sqe = get_sqe();
+    if (!sqe)
+    {
+        return 0;
+    }
+    je = (journal_entry_big_write*)prefill_single_journal_entry(journal, JE_BIG_WRITE, sizeof(journal_entry_big_write));
+    dirty_it->second.journal_sector = journal.sector_info[journal.cur_sector].offset;
+    journal.sector_info[journal.cur_sector].dirty = false;
+    journal.used_sectors[journal.sector_info[journal.cur_sector].offset]++;
+#ifdef BLOCKSTORE_DEBUG
+    printf(
+        "journal offset %08lx is used by %lu:%lu v%lu (%lu refs)\n",
+        journal.sector_info[journal.cur_sector].offset, op->oid.inode, op->oid.stripe, op->version,
+        journal.used_sectors[journal.sector_info[journal.cur_sector].offset]
+    );
+#endif
+    je->oid = op->oid;
+    je->version = op->version;
+    je->offset = op->offset;
+    je->len = op->len;
+    je->location = dirty_it->second.location;
+    je->crc32 = je_crc32((journal_entry*)je);
+    journal.crc32_last = je->crc32;
+    prepare_journal_sector_write(journal, journal.cur_sector, sqe,
+        [this, op](ring_data_t *data) { handle_write_event(data, op); });
+    PRIV(op)->min_flushed_journal_sector = PRIV(op)->max_flushed_journal_sector = 1 + journal.cur_sector;
+    PRIV(op)->pending_ops = 1;
+    PRIV(op)->op_state = 3;
+    return 1;
+resume_4:
+    // Switch object state
+#ifdef BLOCKSTORE_DEBUG
+    printf("Ack write %lu:%lu v%lu = %d\n", op->oid.inode, op->oid.stripe, op->version, dirty_it->second.state);
+#endif
+    bool imm = dirty_it->second.state == ST_D_SUBMITTED
+        ? (immediate_commit == IMMEDIATE_ALL)
+        : (immediate_commit != IMMEDIATE_NONE);
+    if (imm)
+    {
+        auto & unstab = unstable_writes[op->oid];
+        unstab = unstab < op->version ? op->version : unstab;
+    }
+    if (dirty_it->second.state == ST_J_SUBMITTED)
+    {
+        dirty_it->second.state = imm ? ST_J_SYNCED : ST_J_WRITTEN;
+    }
+    else if (dirty_it->second.state == ST_D_SUBMITTED)
+    {
+        dirty_it->second.state = imm ? ST_D_SYNCED : ST_D_WRITTEN;
+    }
+    else if (dirty_it->second.state == ST_DEL_SUBMITTED)
+    {
+        dirty_it->second.state = imm ? ST_DEL_SYNCED : ST_DEL_WRITTEN;
+        if (imm)
+        {
+            // Deletions are treated as immediately stable
+            mark_stable(dirty_it->first);
+        }
+    }
+    if (immediate_commit == IMMEDIATE_ALL)
+    {
+        dirty_it++;
+        while (dirty_it != dirty_db.end() && dirty_it->first.oid == op->oid)
+        {
+            if (dirty_it->second.state == ST_J_WAIT_BIG)
+            {
+                dirty_it->second.state = ST_J_IN_FLIGHT;
+            }
+            dirty_it++;
+        }
+    }
+    inflight_writes--;
+    // Acknowledge write
+    op->retval = op->len;
+    FINISH_OP(op);
+    return 1;
+}
+
+void blockstore_impl_t::handle_write_event(ring_data_t *data, blockstore_op_t *op)
+{
+    live = true;
+    if (data->res != data->iov.iov_len)
+    {
+        inflight_writes--;
+        // FIXME: our state becomes corrupted after a write error. maybe do something better than just die
+        throw std::runtime_error(
+            "write operation failed ("+std::to_string(data->res)+" != "+std::to_string(data->iov.iov_len)+
+            "). in-memory state is corrupted. AAAAAAAaaaaaaaaa!!!111"
+        );
+    }
+    PRIV(op)->pending_ops--;
+    if (PRIV(op)->pending_ops == 0)
+    {
+        release_journal_sectors(op);
+        PRIV(op)->op_state++;
+        if (!continue_write(op))
+        {
+            submit_queue.push_front(op);
+        }
+    }
+}
+
+void blockstore_impl_t::release_journal_sectors(blockstore_op_t *op)
+{
+    // Release flushed journal sectors
+    if (PRIV(op)->min_flushed_journal_sector > 0 &&
+        PRIV(op)->max_flushed_journal_sector > 0)
+    {
+        uint64_t s = PRIV(op)->min_flushed_journal_sector;
+        while (1)
+        {
+            journal.sector_info[s-1].usage_count--;
+            if (s != (1+journal.cur_sector) && journal.sector_info[s-1].usage_count == 0)
+            {
+                // We know for sure that we won't write into this sector anymore
+                uint64_t new_ds = journal.sector_info[s-1].offset + journal.block_size;
+                if (new_ds >= journal.len)
+                {
+                    new_ds = journal.block_size;
+                }
+                if ((journal.dirty_start + (journal.dirty_start >= journal.used_start ? 0 : journal.len)) <
+                    (new_ds + (new_ds >= journal.used_start ? 0 : journal.len)))
+                {
+                    journal.dirty_start = new_ds;
+                }
+            }
+            if (s == PRIV(op)->max_flushed_journal_sector)
+                break;
+            s = 1 + s % journal.sector_count;
+        }
+        PRIV(op)->min_flushed_journal_sector = PRIV(op)->max_flushed_journal_sector = 0;
+    }
+}
+
+int blockstore_impl_t::dequeue_del(blockstore_op_t *op)
+{
+    auto dirty_it = dirty_db.find((obj_ver_id){
+        .oid = op->oid,
+        .version = op->version,
+    });
+    assert(dirty_it != dirty_db.end());
+    blockstore_journal_check_t space_check(this);
+    if (!space_check.check_available(op, 1, sizeof(journal_entry_del), 0))
+    {
+        return 0;
+    }
+    io_uring_sqe *sqe = NULL;
+    if (immediate_commit != IMMEDIATE_NONE ||
+        (journal_block_size - journal.in_sector_pos) < sizeof(journal_entry_del) &&
+        journal.sector_info[journal.cur_sector].dirty)
+    {
+        // Write current journal sector only if it's dirty and full, or in the immediate_commit mode
+        BS_SUBMIT_GET_SQE_DECL(sqe);
+    }
+    auto cb = [this, op](ring_data_t *data) { handle_write_event(data, op); };
+    // Prepare journal sector write
+    if (immediate_commit == IMMEDIATE_NONE)
+    {
+        if (sqe)
+        {
+            prepare_journal_sector_write(journal, journal.cur_sector, sqe, cb);
+            PRIV(op)->min_flushed_journal_sector = PRIV(op)->max_flushed_journal_sector = 1 + journal.cur_sector;
+            PRIV(op)->pending_ops++;
+        }
+        else
+        {
+            PRIV(op)->min_flushed_journal_sector = PRIV(op)->max_flushed_journal_sector = 0;
+        }
+    }
+    // Pre-fill journal entry
+    journal_entry_del *je = (journal_entry_del*)
+        prefill_single_journal_entry(journal, JE_DELETE, sizeof(struct journal_entry_del));
+    dirty_it->second.journal_sector = journal.sector_info[journal.cur_sector].offset;
+    journal.used_sectors[journal.sector_info[journal.cur_sector].offset]++;
+#ifdef BLOCKSTORE_DEBUG
+    printf(
+        "journal offset %08lx is used by %lu:%lu v%lu (%lu refs)\n",
+        dirty_it->second.journal_sector, dirty_it->first.oid.inode, dirty_it->first.oid.stripe, dirty_it->first.version,
+        journal.used_sectors[journal.sector_info[journal.cur_sector].offset]
+    );
+#endif
+    je->oid = op->oid;
+    je->version = op->version;
+    je->crc32 = je_crc32((journal_entry*)je);
+    journal.crc32_last = je->crc32;
+    dirty_it->second.state = ST_DEL_SUBMITTED;
+    if (immediate_commit != IMMEDIATE_NONE)
+    {
+        prepare_journal_sector_write(journal, journal.cur_sector, sqe, cb);
+        PRIV(op)->min_flushed_journal_sector = PRIV(op)->max_flushed_journal_sector = 1 + journal.cur_sector;
+        PRIV(op)->pending_ops++;
+        // Remember small write as unsynced
+        unsynced_small_writes.push_back((obj_ver_id){
+            .oid = op->oid,
+            .version = op->version,
+        });
+    }
+    if (!PRIV(op)->pending_ops)
+    {
+        PRIV(op)->op_state = 4;
+        continue_write(op);
+    }
+    else
+    {
+        PRIV(op)->op_state = 3;
+    }
+    return 1;
+}

cluster_client.cpp

@@ -0,0 +1,349 @@
+#include "cluster_client.h"
+
+cluster_client_t::cluster_client_t(ring_loop_t *ringloop, timerfd_manager_t *tfd, json11::Json & config)
+{
+    this->ringloop = ringloop;
+    this->tfd = tfd;
+
+    msgr.tfd = tfd;
+    msgr.ringloop = ringloop;
+    msgr.repeer_pgs = [this](osd_num_t peer_osd)
+    {
+        // peer_osd just connected or dropped connection
+        if (msgr.osd_peer_fds.find(peer_osd) != msgr.osd_peer_fds.end())
+        {
+            // really connected :)
+            continue_ops();
+        }
+    };
+
+    st_cli.tfd = tfd;
+    st_cli.on_load_config_hook = [this](json11::Json::object & cfg) { on_load_config_hook(cfg); };
+    st_cli.on_change_osd_state_hook = [this](uint64_t peer_osd) { on_change_osd_state_hook(peer_osd); };
+    st_cli.on_change_hook = [this](json11::Json::object & changes) { on_change_hook(changes); };
+    st_cli.on_load_pgs_hook = [this](bool success) { on_load_pgs_hook(success); };
+
+    log_level = config["log_level"].int64_value();
+    st_cli.parse_config(config);
+    st_cli.load_global_config();
+}
+
+void cluster_client_t::continue_ops()
+{
+    for (auto op_it = unsent_ops.begin(); op_it != unsent_ops.end(); )
+    {
+        cluster_op_t *op = *op_it;
+        if (op->needs_reslice && !op->sent_count)
+        {
+            op->parts.clear();
+            op->done_count = 0;
+            op->needs_reslice = false;
+        }
+        if (!op->parts.size())
+        {
+            unsent_ops.erase(op_it++);
+            execute(op);
+            continue;
+        }
+        if (!op->needs_reslice)
+        {
+            for (auto & op_part: op->parts)
+            {
+                if (!op_part.sent && !op_part.done)
+                {
+                    try_send(op, &op_part);
+                }
+            }
+            if (op->sent_count == op->parts.size() - op->done_count)
+            {
+                unsent_ops.erase(op_it++);
+                sent_ops.insert(op);
+            }
+            else
+                op_it++;
+        }
+        else
+            op_it++;
+    }
+}
+
+static uint32_t is_power_of_two(uint64_t value)
+{
+    uint32_t l = 0;
+    while (value > 1)
+    {
+        if (value & 1)
+        {
+            return 64;
+        }
+        value = value >> 1;
+        l++;
+    }
+    return l;
+}
+
+void cluster_client_t::on_load_config_hook(json11::Json::object & config)
+{
+    bs_block_size = config["block_size"].uint64_value();
+    bs_disk_alignment = config["disk_alignment"].uint64_value();
+    bs_bitmap_granularity = config["bitmap_granularity"].uint64_value();
+    if (!bs_block_size)
+        bs_block_size = DEFAULT_BLOCK_SIZE;
+    if (!bs_disk_alignment)
+        bs_disk_alignment = DEFAULT_DISK_ALIGNMENT;
+    if (!bs_bitmap_granularity)
+        bs_bitmap_granularity = DEFAULT_BITMAP_GRANULARITY;
+    {
+        uint32_t block_order;
+        if ((block_order = is_power_of_two(bs_block_size)) >= 64 || bs_block_size < MIN_BLOCK_SIZE || bs_block_size >= MAX_BLOCK_SIZE)
+            throw std::runtime_error("Bad block size");
+    }
+    if (config.find("pg_stripe_size") != config.end())
+    {
+        pg_stripe_size = config["pg_stripe_size"].uint64_value();
+        if (!pg_stripe_size)
+            pg_stripe_size = DEFAULT_PG_STRIPE_SIZE;
+    }
+    if (config["immediate_commit"] == "all")
+    {
+        // Cluster-wide immediate_commit mode
+        immediate_commit = true;
+    }
+    msgr.peer_connect_interval = config["peer_connect_interval"].uint64_value();
+    if (!msgr.peer_connect_interval)
+        msgr.peer_connect_interval = DEFAULT_PEER_CONNECT_INTERVAL;
+    msgr.peer_connect_timeout = config["peer_connect_timeout"].uint64_value();
+    if (!msgr.peer_connect_timeout)
+        msgr.peer_connect_timeout = DEFAULT_PEER_CONNECT_TIMEOUT;
+}
+
+void cluster_client_t::on_load_pgs_hook(bool success)
+{
+    if (success)
+    {
+        pg_count = st_cli.pg_config.size();
+        continue_ops();
+    }
+}
+
+void cluster_client_t::on_change_hook(json11::Json::object & changes)
+{
+    if (pg_count != st_cli.pg_config.size())
+    {
+        // At this point, all operations should be suspended
+        // And they need to be resliced!
+        for (auto op: unsent_ops)
+        {
+            op->needs_reslice = true;
+        }
+        for (auto op: sent_ops)
+        {
+            op->needs_reslice = true;
+        }
+        pg_count = st_cli.pg_config.size();
+    }
+    continue_ops();
+}
+
+void cluster_client_t::on_change_osd_state_hook(uint64_t peer_osd)
+{
+    if (msgr.wanted_peers.find(peer_osd) != msgr.wanted_peers.end())
+    {
+        msgr.connect_peer(peer_osd, st_cli.peer_states[peer_osd]);
+    }
+}
+
+// FIXME: Implement OSD_OP_SYNC for immediate_commit == false
+void cluster_client_t::execute(cluster_op_t *op)
+{
+    if (op->opcode == OSD_OP_SYNC && immediate_commit)
+    {
+        // Syncs are not required in the immediate_commit mode
+        op->retval = 0;
+        std::function<void(cluster_op_t*)>(op->callback)(op);
+        return;
+    }
+    if (op->opcode != OSD_OP_READ && op->opcode != OSD_OP_OUT || !op->inode || !op->len ||
+        op->offset % bs_disk_alignment || op->len % bs_disk_alignment)
+    {
+        op->retval = -EINVAL;
+        std::function<void(cluster_op_t*)>(op->callback)(op);
+        return;
+    }
+    if (!pg_stripe_size)
+    {
+        // Config is not loaded yet
+        unsent_ops.insert(op);
+        return;
+    }
+    if (op->opcode == OSD_OP_WRITE && !immediate_commit)
+    {
+        // Copy operation
+        cluster_op_t *op_copy = new cluster_op_t();
+        op_copy->opcode = op->opcode;
+        op_copy->inode = op->inode;
+        op_copy->offset = op->offset;
+        op_copy->len = op->len;
+        op_copy->buf = malloc(op->len);
+        memcpy(op_copy->buf, op->buf, op->len);
+        unsynced_ops.push_back(op_copy);
+        unsynced_bytes += op->len;
+        if (inmemory_commit)
+        {
+            // Immediately acknowledge write and continue with the copy
+            op->retval = op->len;
+            std::function<void(cluster_op_t*)>(op->callback)(op);
+            op = op_copy;
+        }
+        if (unsynced_bytes >= inmemory_dirty_limit)
+        {
+            // Push an extra SYNC operation
+        }
+    }
+    // Slice the request into individual object stripe requests
+    // Primary OSDs still operate individual stripes, but their size is multiplied by PG minsize in case of EC
+    uint64_t pg_block_size = bs_block_size * pg_part_count;
+    uint64_t first_stripe = (op->offset / pg_block_size) * pg_block_size;
+    uint64_t last_stripe = ((op->offset + op->len + pg_block_size - 1) / pg_block_size - 1) * pg_block_size;
+    int part_count = 0;
+    for (uint64_t stripe = first_stripe; stripe <= last_stripe; stripe += pg_block_size)
+    {
+        if (op->offset < (stripe+pg_block_size) && (op->offset+op->len) > stripe)
+        {
+            part_count++;
+        }
+    }
+    op->parts.resize(part_count);
+    bool resend = false;
+    int i = 0;
+    for (uint64_t stripe = first_stripe; stripe <= last_stripe; stripe += pg_block_size)
+    {
+        uint64_t stripe_end = stripe + pg_block_size;
+        if (op->offset < stripe_end && (op->offset+op->len) > stripe)
+        {
+            pg_num_t pg_num = (op->inode + stripe/pg_stripe_size) % pg_count + 1;
+            op->parts[i] = {
+                .parent = op,
+                .offset = op->offset < stripe ? stripe : op->offset,
+                .len = (uint32_t)((op->offset+op->len) > stripe_end ? pg_block_size : op->offset+op->len-stripe),
+                .pg_num = pg_num,
+                .buf = op->buf + (op->offset < stripe ? stripe-op->offset : 0),
+                .sent = false,
+                .done = false,
+            };
+            if (!try_send(op, &op->parts[i]))
+            {
+                // Part needs to be sent later
+                resend = true;
+            }
+            i++;
+        }
+    }
+    if (resend)
+    {
+        unsent_ops.insert(op);
+    }
+    else
+    {
+        sent_ops.insert(op);
+    }
+}
+
+bool cluster_client_t::try_send(cluster_op_t *op, cluster_op_part_t *part)
+{
+    auto pg_it = st_cli.pg_config.find(part->pg_num);
+    if (pg_it != st_cli.pg_config.end() &&
+        !pg_it->second.pause && pg_it->second.cur_primary)
+    {
+        osd_num_t primary_osd = pg_it->second.cur_primary;
+        auto peer_it = msgr.osd_peer_fds.find(primary_osd);
+        if (peer_it != msgr.osd_peer_fds.end())
+        {
+            int peer_fd = peer_it->second;
+            part->osd_num = primary_osd;
+            part->sent = true;
+            op->sent_count++;
+            part->op = {
+                .op_type = OSD_OP_OUT,
+                .peer_fd = peer_fd,
+                .req = { .rw = {
+                    .header = {
+                        .magic = SECONDARY_OSD_OP_MAGIC,
+                        .id = op_id++,
+                        .opcode = op->opcode,
+                    },
+                    .inode = op->inode,
+                    .offset = part->offset,
+                    .len = part->len,
+                } },
+                .callback = [this, part](osd_op_t *op_part)
+                {
+                    handle_op_part(part);
+                },
+            };
+            part->op.send_list.push_back(part->op.req.buf, OSD_PACKET_SIZE);
+            if (op->opcode == OSD_OP_WRITE)
+            {
+                part->op.send_list.push_back(part->buf, part->len);
+            }
+            else
+            {
+                part->op.buf = part->buf;
+            }
+            msgr.outbox_push(&part->op);
+            return true;
+        }
+        else if (msgr.wanted_peers.find(primary_osd) == msgr.wanted_peers.end())
+        {
+            msgr.connect_peer(primary_osd, st_cli.peer_states[primary_osd]);
+        }
+    }
+    return false;
+}
+
+void cluster_client_t::handle_op_part(cluster_op_part_t *part)
+{
+    cluster_op_t *op = part->parent;
+    part->sent = false;
+    op->sent_count--;
+    part->op.buf = NULL;
+    if (part->op.reply.hdr.retval != part->op.req.rw.len)
+    {
+        // Operation failed, retry
+        printf(
+            "Operation part failed on OSD %lu: retval=%ld (expected %u), reconnecting\n",
+            part->osd_num, part->op.reply.hdr.retval, part->op.req.rw.len
+        );
+        msgr.stop_client(part->op.peer_fd);
+        if (op->sent_count == op->parts.size() - op->done_count - 1)
+        {
+            // Resend later when OSDs come up
+            // FIXME: Check for different types of errors
+            // FIXME: Repeat operations after a small timeout, for the case when OSD is coming up
+            sent_ops.erase(op);
+            unsent_ops.insert(op);
+        }
+        if (op->sent_count == 0 && op->needs_reslice)
+        {
+            // PG count has changed, reslice the operation
+            unsent_ops.erase(op);
+            op->parts.clear();
+            op->done_count = 0;
+            op->needs_reslice = false;
+            execute(op);
+        }
+    }
+    else
+    {
+        // OK
+        part->done = true;
+        op->done_count++;
+        if (op->done_count >= op->parts.size())
+        {
+            // Finished!
+            sent_ops.erase(op);
+            op->retval = op->len;
+            std::function<void(cluster_op_t*)>(op->callback)(op);
+        }
+    }
+}

cluster_client.h

@@ -0,0 +1,80 @@
+#pragma once
+
+#include "messenger.h"
+#include "etcd_state_client.h"
+
+#define MIN_BLOCK_SIZE 4*1024
+#define MAX_BLOCK_SIZE 128*1024*1024
+#define DEFAULT_BLOCK_SIZE 128*1024
+#define DEFAULT_PG_STRIPE_SIZE 4*1024*1024
+#define DEFAULT_DISK_ALIGNMENT 4096
+#define DEFAULT_BITMAP_GRANULARITY 4096
+
+struct cluster_op_t;
+
+struct cluster_op_part_t
+{
+    cluster_op_t *parent;
+    uint64_t offset;
+    uint32_t len;
+    pg_num_t pg_num;
+    osd_num_t osd_num;
+    void *buf;
+    bool sent;
+    bool done;
+    osd_op_t op;
+};
+
+struct cluster_op_t
+{
+    uint64_t opcode; // OSD_OP_READ, OSD_OP_WRITE, OSD_OP_SYNC
+    uint64_t inode;
+    uint64_t offset;
+    uint64_t len;
+    int retval;
+    void *buf;
+    std::function<void(cluster_op_t*)> callback;
+protected:
+    bool needs_reslice = false;
+    int sent_count = 0, done_count = 0;
+    std::vector<cluster_op_part_t> parts;
+    friend class cluster_client_t;
+};
+
+class cluster_client_t
+{
+    timerfd_manager_t *tfd;
+    ring_loop_t *ringloop;
+
+    uint64_t pg_part_count = 2;
+    uint64_t pg_stripe_size = 0;
+    uint64_t bs_block_size = 0;
+    uint64_t bs_disk_alignment = 0;
+    uint64_t bs_bitmap_granularity = 0;
+    uint64_t pg_count = 0;
+    bool immediate_commit = false;
+    bool inmemory_commit = false;
+    uint64_t inmemory_dirty_limit = 32*1024*1024;
+    int log_level;
+
+    uint64_t op_id = 1;
+    etcd_state_client_t st_cli;
+    osd_messenger_t msgr;
+    std::set<cluster_op_t*> sent_ops, unsent_ops;
+    // unsynced operations are copied in memory to allow replay when cluster isn't in the immediate_commit mode
+    std::vector<cluster_op_t*> unsynced_ops;
+    uint64_t unsynced_bytes = 0;
+
+public:
+    cluster_client_t(ring_loop_t *ringloop, timerfd_manager_t *tfd, json11::Json & config);
+    void execute(cluster_op_t *op);
+
+protected:
+    void continue_ops();
+    void on_load_config_hook(json11::Json::object & cfg);
+    void on_load_pgs_hook(bool success);
+    void on_change_hook(json11::Json::object & changes);
+    void on_change_osd_state_hook(uint64_t peer_osd);
+    bool try_send(cluster_op_t *op, cluster_op_part_t *part);
+    void handle_op_part(cluster_op_part_t *part);
+};

copy-fio-includes.sh

@@ -1,13 +0,0 @@
-#!/bin/bash
-
-gcc -I. -E -o fio_headers.i src/fio_headers.h
-
-rm -rf fio-copy
-for i in `grep -Po 'fio/[^"]+' fio_headers.i | sort | uniq`; do
-    j=${i##fio/}
-    p=$(dirname $j)
-    mkdir -p fio-copy/$p
-    cp $i fio-copy/$j
-done
-
-rm fio_headers.i

copy-qemu-includes.sh

@@ -1,18 +0,0 @@
-#!/bin/bash
-
-#cd qemu
-#debian/rules b/configure-stamp
-#cd b/qemu; make qapi
-
-gcc -I qemu/b/qemu `pkg-config glib-2.0 --cflags` \
-    -I qemu/include -E -o qemu_driver.i src/qemu_driver.c
-
-rm -rf qemu-copy
-for i in `grep -Po 'qemu/[^"]+' qemu_driver.i | sort | uniq`; do
-    j=${i##qemu/}
-    p=$(dirname $j)
-    mkdir -p qemu-copy/$p
-    cp $i qemu-copy/$j
-done
-
-rm qemu_driver.i

cpp-btree

@@ -1 +0,0 @@
-Subproject commit 5dc108754ad40d3b1d024f9bd7cca0595ef1a1db

crc32c.h

@@ -8,10 +8,4 @@
 // unsigned __int64 _mm_crc32_u64 (unsigned __int64 crc, unsigned __int64 v)
 // unsigned int _mm_crc32_u8 (unsigned int crc, unsigned char v)
 
-#ifdef __cplusplus
-extern "C" {
-#endif
 uint32_t crc32c(uint32_t crc, const void *buf, size_t len);
-#ifdef __cplusplus
-};
-#endif

csi/.dockerignore

@@ -1,3 +0,0 @@
-vitastor-csi
-go.sum
-Dockerfile

csi/Dockerfile

@@ -1,32 +0,0 @@
-# Compile stage
-FROM golang:buster AS build
-
-ADD go.mod /app/
-RUN cd /app; CGO_ENABLED=1 GOOS=linux GOARCH=amd64 go mod download -x
-ADD . /app
-RUN perl -i -e '$/ = undef; while(<>) { s/\n\s*(\{\s*\n)/$1\n/g; s/\}(\s*\n\s*)else\b/$1} else/g; print; }' `find /app -name '*.go'`
-RUN cd /app; CGO_ENABLED=1 GOOS=linux GOARCH=amd64 go build -o vitastor-csi
-
-# Final stage
-FROM debian:buster
-
-LABEL maintainers="Vitaliy Filippov <vitalif@yourcmc.ru>"
-LABEL description="Vitastor CSI Driver"
-
-ENV NODE_ID=""
-ENV CSI_ENDPOINT=""
-
-RUN apt-get update && \
-    apt-get install -y wget && \
-    wget -q -O /etc/apt/trusted.gpg.d/vitastor.gpg https://vitastor.io/debian/pubkey.gpg && \
-    (echo deb http://vitastor.io/debian buster main > /etc/apt/sources.list.d/vitastor.list) && \
-    (echo deb http://deb.debian.org/debian buster-backports main > /etc/apt/sources.list.d/backports.list) && \
-    (echo "APT::Install-Recommends false;" > /etc/apt/apt.conf) && \
-    apt-get update && \
-    apt-get install -y e2fsprogs xfsprogs vitastor kmod && \
-    apt-get clean && \
-    (echo options nbd nbds_max=128 > /etc/modprobe.d/nbd.conf)
-
-COPY --from=build /app/vitastor-csi /bin/
-
-ENTRYPOINT ["/bin/vitastor-csi"]

csi/Makefile

@@ -1,9 +0,0 @@
-VERSION ?= v0.6.5
-
-all: build push
-
-build:
-	@docker build --rm -t vitalif/vitastor-csi:$(VERSION) .
-
-push:
-	@docker push vitalif/vitastor-csi:$(VERSION)

csi/deploy/000-csi-namespace.yaml

@@ -1,5 +0,0 @@
----
-apiVersion: v1
-kind: Namespace
-metadata:
-  name: vitastor-system

csi/deploy/001-csi-config-map.yaml

@@ -1,9 +0,0 @@
----
-apiVersion: v1
-kind: ConfigMap
-data:
-  vitastor.conf: |-
-    {"etcd_address":"http://192.168.7.2:2379","etcd_prefix":"/vitastor"}
-metadata:
-  namespace: vitastor-system
-  name: vitastor-config

csi/deploy/002-csi-nodeplugin-rbac.yaml

@@ -1,37 +0,0 @@
----
-apiVersion: v1
-kind: ServiceAccount
-metadata:
-  namespace: vitastor-system
-  name: vitastor-csi-nodeplugin
----
-kind: ClusterRole
-apiVersion: rbac.authorization.k8s.io/v1
-metadata:
-  namespace: vitastor-system
-  name: vitastor-csi-nodeplugin
-rules:
-  - apiGroups: [""]
-    resources: ["nodes"]
-    verbs: ["get"]
-  # allow to read Vault Token and connection options from the Tenants namespace
-  - apiGroups: [""]
-    resources: ["secrets"]
-    verbs: ["get"]
-  - apiGroups: [""]
-    resources: ["configmaps"]
-    verbs: ["get"]
----
-kind: ClusterRoleBinding
-apiVersion: rbac.authorization.k8s.io/v1
-metadata:
-  namespace: vitastor-system
-  name: vitastor-csi-nodeplugin
-subjects:
-  - kind: ServiceAccount
-    name: vitastor-csi-nodeplugin
-    namespace: vitastor-system
-roleRef:
-  kind: ClusterRole
-  name: vitastor-csi-nodeplugin
-  apiGroup: rbac.authorization.k8s.io

csi/deploy/003-csi-nodeplugin-psp.yaml

@@ -1,72 +0,0 @@
----
-apiVersion: policy/v1beta1
-kind: PodSecurityPolicy
-metadata:
-  namespace: vitastor-system
-  name: vitastor-csi-nodeplugin-psp
-spec:
-  allowPrivilegeEscalation: true
-  allowedCapabilities:
-    - 'SYS_ADMIN'
-  fsGroup:
-    rule: RunAsAny
-  privileged: true
-  hostNetwork: true
-  hostPID: true
-  runAsUser:
-    rule: RunAsAny
-  seLinux:
-    rule: RunAsAny
-  supplementalGroups:
-    rule: RunAsAny
-  volumes:
-    - 'configMap'
-    - 'emptyDir'
-    - 'projected'
-    - 'secret'
-    - 'downwardAPI'
-    - 'hostPath'
-  allowedHostPaths:
-    - pathPrefix: '/dev'
-      readOnly: false
-    - pathPrefix: '/run/mount'
-      readOnly: false
-    - pathPrefix: '/sys'
-      readOnly: false
-    - pathPrefix: '/lib/modules'
-      readOnly: true
-    - pathPrefix: '/var/lib/kubelet/pods'
-      readOnly: false
-    - pathPrefix: '/var/lib/kubelet/plugins/csi.vitastor.io'
-      readOnly: false
-    - pathPrefix: '/var/lib/kubelet/plugins_registry'
-      readOnly: false
-    - pathPrefix: '/var/lib/kubelet/plugins'
-      readOnly: false
-
----
-kind: Role
-apiVersion: rbac.authorization.k8s.io/v1
-metadata:
-  namespace: vitastor-system
-  name: vitastor-csi-nodeplugin-psp
-rules:
-  - apiGroups: ['policy']
-    resources: ['podsecuritypolicies']
-    verbs: ['use']
-    resourceNames: ['vitastor-csi-nodeplugin-psp']
-
----
-kind: RoleBinding
-apiVersion: rbac.authorization.k8s.io/v1
-metadata:
-  namespace: vitastor-system
-  name: vitastor-csi-nodeplugin-psp
-subjects:
-  - kind: ServiceAccount
-    name: vitastor-csi-nodeplugin
-    namespace: vitastor-system
-roleRef:
-  kind: Role
-  name: vitastor-csi-nodeplugin-psp
-  apiGroup: rbac.authorization.k8s.io

csi/deploy/004-csi-nodeplugin.yaml

@@ -1,140 +0,0 @@
----
-kind: DaemonSet
-apiVersion: apps/v1
-metadata:
-  namespace: vitastor-system
-  name: csi-vitastor
-spec:
-  selector:
-    matchLabels:
-      app: csi-vitastor
-  template:
-    metadata:
-      namespace: vitastor-system
-      labels:
-        app: csi-vitastor
-    spec:
-      serviceAccountName: vitastor-csi-nodeplugin
-      hostNetwork: true
-      hostPID: true
-      priorityClassName: system-node-critical
-      # to use e.g. Rook orchestrated cluster, and mons' FQDN is
-      # resolved through k8s service, set dns policy to cluster first
-      dnsPolicy: ClusterFirstWithHostNet
-      containers:
-        - name: driver-registrar
-          # This is necessary only for systems with SELinux, where
-          # non-privileged sidecar containers cannot access unix domain socket
-          # created by privileged CSI driver container.
-          securityContext:
-            privileged: true
-          image: k8s.gcr.io/sig-storage/csi-node-driver-registrar:v2.2.0
-          args:
-            - "--v=5"
-            - "--csi-address=/csi/csi.sock"
-            - "--kubelet-registration-path=/var/lib/kubelet/plugins/csi.vitastor.io/csi.sock"
-          env:
-            - name: KUBE_NODE_NAME
-              valueFrom:
-                fieldRef:
-                  fieldPath: spec.nodeName
-          volumeMounts:
-            - name: socket-dir
-              mountPath: /csi
-            - name: registration-dir
-              mountPath: /registration
-        - name: csi-vitastor
-          securityContext:
-            privileged: true
-            capabilities:
-              add: ["SYS_ADMIN"]
-            allowPrivilegeEscalation: true
-          image: vitalif/vitastor-csi:v0.6.5
-          args:
-            - "--node=$(NODE_ID)"
-            - "--endpoint=$(CSI_ENDPOINT)"
-          env:
-            - name: NODE_ID
-              valueFrom:
-                fieldRef:
-                  fieldPath: spec.nodeName
-            - name: CSI_ENDPOINT
-              value: unix:///csi/csi.sock
-          imagePullPolicy: "IfNotPresent"
-          ports:
-          - containerPort: 9898
-            name: healthz
-            protocol: TCP
-          livenessProbe:
-            failureThreshold: 5
-            httpGet:
-              path: /healthz
-              port: healthz
-            initialDelaySeconds: 10
-            timeoutSeconds: 3
-            periodSeconds: 2
-          volumeMounts:
-            - name: socket-dir
-              mountPath: /csi
-            - mountPath: /dev
-              name: host-dev
-            - mountPath: /sys
-              name: host-sys
-            - mountPath: /run/mount
-              name: host-mount
-            - mountPath: /lib/modules
-              name: lib-modules
-              readOnly: true
-            - name: vitastor-config
-              mountPath: /etc/vitastor
-            - name: plugin-dir
-              mountPath: /var/lib/kubelet/plugins
-              mountPropagation: "Bidirectional"
-            - name: mountpoint-dir
-              mountPath: /var/lib/kubelet/pods
-              mountPropagation: "Bidirectional"
-        - name: liveness-probe
-          securityContext:
-            privileged: true
-          image: quay.io/k8scsi/livenessprobe:v1.1.0
-          args:
-            - "--csi-address=$(CSI_ENDPOINT)"
-            - "--health-port=9898"
-          env:
-            - name: CSI_ENDPOINT
-              value: unix://csi/csi.sock
-          volumeMounts:
-          - mountPath: /csi
-            name: socket-dir
-      volumes:
-        - name: socket-dir
-          hostPath:
-            path: /var/lib/kubelet/plugins/csi.vitastor.io
-            type: DirectoryOrCreate
-        - name: plugin-dir
-          hostPath:
-            path: /var/lib/kubelet/plugins
-            type: Directory
-        - name: mountpoint-dir
-          hostPath:
-            path: /var/lib/kubelet/pods
-            type: DirectoryOrCreate
-        - name: registration-dir
-          hostPath:
-            path: /var/lib/kubelet/plugins_registry/
-            type: Directory
-        - name: host-dev
-          hostPath:
-            path: /dev
-        - name: host-sys
-          hostPath:
-            path: /sys
-        - name: host-mount
-          hostPath:
-            path: /run/mount
-        - name: lib-modules
-          hostPath:
-            path: /lib/modules
-        - name: vitastor-config
-          configMap:
-            name: vitastor-config

csi/deploy/005-csi-provisioner-rbac.yaml

@@ -1,102 +0,0 @@
----
-apiVersion: v1
-kind: ServiceAccount
-metadata:
-  namespace: vitastor-system
-  name: vitastor-csi-provisioner
-
----
-kind: ClusterRole
-apiVersion: rbac.authorization.k8s.io/v1
-metadata:
-  namespace: vitastor-system
-  name: vitastor-external-provisioner-runner
-rules:
-  - apiGroups: [""]
-    resources: ["nodes"]
-    verbs: ["get", "list", "watch"]
-  - apiGroups: [""]
-    resources: ["secrets"]
-    verbs: ["get", "list", "watch"]
-  - apiGroups: [""]
-    resources: ["events"]
-    verbs: ["list", "watch", "create", "update", "patch"]
-  - apiGroups: [""]
-    resources: ["persistentvolumes"]
-    verbs: ["get", "list", "watch", "create", "update", "delete", "patch"]
-  - apiGroups: [""]
-    resources: ["persistentvolumeclaims"]
-    verbs: ["get", "list", "watch", "update"]
-  - apiGroups: [""]
-    resources: ["persistentvolumeclaims/status"]
-    verbs: ["update", "patch"]
-  - apiGroups: ["storage.k8s.io"]
-    resources: ["storageclasses"]
-    verbs: ["get", "list", "watch"]
-  - apiGroups: ["snapshot.storage.k8s.io"]
-    resources: ["volumesnapshots"]
-    verbs: ["get", "list"]
-  - apiGroups: ["snapshot.storage.k8s.io"]
-    resources: ["volumesnapshotcontents"]
-    verbs: ["create", "get", "list", "watch", "update", "delete"]
-  - apiGroups: ["snapshot.storage.k8s.io"]
-    resources: ["volumesnapshotclasses"]
-    verbs: ["get", "list", "watch"]
-  - apiGroups: ["storage.k8s.io"]
-    resources: ["volumeattachments"]
-    verbs: ["get", "list", "watch", "update", "patch"]
-  - apiGroups: ["storage.k8s.io"]
-    resources: ["volumeattachments/status"]
-    verbs: ["patch"]
-  - apiGroups: ["storage.k8s.io"]
-    resources: ["csinodes"]
-    verbs: ["get", "list", "watch"]
-  - apiGroups: ["snapshot.storage.k8s.io"]
-    resources: ["volumesnapshotcontents/status"]
-    verbs: ["update"]
-  - apiGroups: [""]
-    resources: ["configmaps"]
-    verbs: ["get"]
----
-kind: ClusterRoleBinding
-apiVersion: rbac.authorization.k8s.io/v1
-metadata:
-  namespace: vitastor-system
-  name: vitastor-csi-provisioner-role
-subjects:
-  - kind: ServiceAccount
-    name: vitastor-csi-provisioner
-    namespace: vitastor-system
-roleRef:
-  kind: ClusterRole
-  name: vitastor-external-provisioner-runner
-  apiGroup: rbac.authorization.k8s.io
-
----
-kind: Role
-apiVersion: rbac.authorization.k8s.io/v1
-metadata:
-  namespace: vitastor-system
-  name: vitastor-external-provisioner-cfg
-rules:
-  - apiGroups: [""]
-    resources: ["configmaps"]
-    verbs: ["get", "list", "watch", "create", "update", "delete"]
-  - apiGroups: ["coordination.k8s.io"]
-    resources: ["leases"]
-    verbs: ["get", "watch", "list", "delete", "update", "create"]
-
----
-kind: RoleBinding
-apiVersion: rbac.authorization.k8s.io/v1
-metadata:
-  name: vitastor-csi-provisioner-role-cfg
-  namespace: vitastor-system
-subjects:
-  - kind: ServiceAccount
-    name: vitastor-csi-provisioner
-    namespace: vitastor-system
-roleRef:
-  kind: Role
-  name: vitastor-external-provisioner-cfg
-  apiGroup: rbac.authorization.k8s.io

csi/deploy/006-csi-provisioner-psp.yaml

@@ -1,60 +0,0 @@
----
-apiVersion: policy/v1beta1
-kind: PodSecurityPolicy
-metadata:
-  namespace: vitastor-system
-  name: vitastor-csi-provisioner-psp
-spec:
-  allowPrivilegeEscalation: true
-  allowedCapabilities:
-    - 'SYS_ADMIN'
-  fsGroup:
-    rule: RunAsAny
-  privileged: true
-  runAsUser:
-    rule: RunAsAny
-  seLinux:
-    rule: RunAsAny
-  supplementalGroups:
-    rule: RunAsAny
-  volumes:
-    - 'configMap'
-    - 'emptyDir'
-    - 'projected'
-    - 'secret'
-    - 'downwardAPI'
-    - 'hostPath'
-  allowedHostPaths:
-    - pathPrefix: '/dev'
-      readOnly: false
-    - pathPrefix: '/sys'
-      readOnly: false
-    - pathPrefix: '/lib/modules'
-      readOnly: true
-
----
-kind: Role
-apiVersion: rbac.authorization.k8s.io/v1
-metadata:
-  namespace: vitastor-system
-  name: vitastor-csi-provisioner-psp
-rules:
-  - apiGroups: ['policy']
-    resources: ['podsecuritypolicies']
-    verbs: ['use']
-    resourceNames: ['vitastor-csi-provisioner-psp']
-
----
-kind: RoleBinding
-apiVersion: rbac.authorization.k8s.io/v1
-metadata:
-  name: vitastor-csi-provisioner-psp
-  namespace: vitastor-system
-subjects:
-  - kind: ServiceAccount
-    name: vitastor-csi-provisioner
-    namespace: vitastor-system
-roleRef:
-  kind: Role
-  name: vitastor-csi-provisioner-psp
-  apiGroup: rbac.authorization.k8s.io

csi/deploy/007-csi-provisioner.yaml

@@ -1,159 +0,0 @@
----
-kind: Service
-apiVersion: v1
-metadata:
-  namespace: vitastor-system
-  name: csi-vitastor-provisioner
-  labels:
-    app: csi-metrics
-spec:
-  selector:
-    app: csi-vitastor-provisioner
-  ports:
-    - name: http-metrics
-      port: 8080
-      protocol: TCP
-      targetPort: 8680
-
----
-kind: Deployment
-apiVersion: apps/v1
-metadata:
-  namespace: vitastor-system
-  name: csi-vitastor-provisioner
-spec:
-  replicas: 3
-  selector:
-    matchLabels:
-      app: csi-vitastor-provisioner
-  template:
-    metadata:
-      namespace: vitastor-system
-      labels:
-        app: csi-vitastor-provisioner
-    spec:
-      affinity:
-        podAntiAffinity:
-          requiredDuringSchedulingIgnoredDuringExecution:
-            - labelSelector:
-                matchExpressions:
-                  - key: app
-                    operator: In
-                    values:
-                      - csi-vitastor-provisioner
-              topologyKey: "kubernetes.io/hostname"
-      serviceAccountName: vitastor-csi-provisioner
-      priorityClassName: system-cluster-critical
-      containers:
-        - name: csi-provisioner
-          image: k8s.gcr.io/sig-storage/csi-provisioner:v2.2.0
-          args:
-            - "--csi-address=$(ADDRESS)"
-            - "--v=5"
-            - "--timeout=150s"
-            - "--retry-interval-start=500ms"
-            - "--leader-election=true"
-            #  set it to true to use topology based provisioning
-            - "--feature-gates=Topology=false"
-            # if fstype is not specified in storageclass, ext4 is default
-            - "--default-fstype=ext4"
-            - "--extra-create-metadata=true"
-          env:
-            - name: ADDRESS
-              value: unix:///csi/csi-provisioner.sock
-          imagePullPolicy: "IfNotPresent"
-          volumeMounts:
-            - name: socket-dir
-              mountPath: /csi
-        - name: csi-snapshotter
-          image: k8s.gcr.io/sig-storage/csi-snapshotter:v4.0.0
-          args:
-            - "--csi-address=$(ADDRESS)"
-            - "--v=5"
-            - "--timeout=150s"
-            - "--leader-election=true"
-          env:
-            - name: ADDRESS
-              value: unix:///csi/csi-provisioner.sock
-          imagePullPolicy: "IfNotPresent"
-          securityContext:
-            privileged: true
-          volumeMounts:
-            - name: socket-dir
-              mountPath: /csi
-        - name: csi-attacher
-          image: k8s.gcr.io/sig-storage/csi-attacher:v3.1.0
-          args:
-            - "--v=5"
-            - "--csi-address=$(ADDRESS)"
-            - "--leader-election=true"
-            - "--retry-interval-start=500ms"
-          env:
-            - name: ADDRESS
-              value: /csi/csi-provisioner.sock
-          imagePullPolicy: "IfNotPresent"
-          volumeMounts:
-            - name: socket-dir
-              mountPath: /csi
-        - name: csi-resizer
-          image: k8s.gcr.io/sig-storage/csi-resizer:v1.1.0
-          args:
-            - "--csi-address=$(ADDRESS)"
-            - "--v=5"
-            - "--timeout=150s"
-            - "--leader-election"
-            - "--retry-interval-start=500ms"
-            - "--handle-volume-inuse-error=false"
-          env:
-            - name: ADDRESS
-              value: unix:///csi/csi-provisioner.sock
-          imagePullPolicy: "IfNotPresent"
-          volumeMounts:
-            - name: socket-dir
-              mountPath: /csi
-        - name: csi-vitastor
-          securityContext:
-            privileged: true
-            capabilities:
-              add: ["SYS_ADMIN"]
-          image: vitalif/vitastor-csi:v0.6.5
-          args:
-            - "--node=$(NODE_ID)"
-            - "--endpoint=$(CSI_ENDPOINT)"
-          env:
-            - name: NODE_ID
-              valueFrom:
-                fieldRef:
-                  fieldPath: spec.nodeName
-            - name: CSI_ENDPOINT
-              value: unix:///csi/csi-provisioner.sock
-          imagePullPolicy: "IfNotPresent"
-          volumeMounts:
-            - name: socket-dir
-              mountPath: /csi
-            - mountPath: /dev
-              name: host-dev
-            - mountPath: /sys
-              name: host-sys
-            - mountPath: /lib/modules
-              name: lib-modules
-              readOnly: true
-            - name: vitastor-config
-              mountPath: /etc/vitastor
-      volumes:
-        - name: host-dev
-          hostPath:
-            path: /dev
-        - name: host-sys
-          hostPath:
-            path: /sys
-        - name: lib-modules
-          hostPath:
-            path: /lib/modules
-        - name: socket-dir
-          emptyDir: {
-            medium: "Memory"
-          }
-        - name: vitastor-config
-          configMap:
-            name: vitastor-config

csi/deploy/008-csi-driver.yaml

@@ -1,11 +0,0 @@
----
-# if Kubernetes version is less than 1.18 change
-# apiVersion to storage.k8s.io/v1betav1
-apiVersion: storage.k8s.io/v1
-kind: CSIDriver
-metadata:
-  namespace: vitastor-system
-  name: csi.vitastor.io
-spec:
-  attachRequired: true
-  podInfoOnMount: false

csi/deploy/009-storage-class.yaml

@@ -1,19 +0,0 @@
----
-apiVersion: storage.k8s.io/v1
-kind: StorageClass
-metadata:
-  namespace: vitastor-system
-  name: vitastor
-  annotations:
-    storageclass.kubernetes.io/is-default-class: "true"
-provisioner: csi.vitastor.io
-volumeBindingMode: Immediate
-parameters:
-  etcdVolumePrefix: ""
-  poolId: "1"
-  # you can choose other configuration file if you have it in the config map
-  #configPath: "/etc/vitastor/vitastor.conf"
-  # you can also specify etcdUrl here, maybe to connect to another Vitastor cluster
-  # multiple etcdUrls may be specified, delimited by comma
-  #etcdUrl: "http://192.168.7.2:2379"
-  #etcdPrefix: "/vitastor"

csi/deploy/example-pvc.yaml

@@ -1,12 +0,0 @@
----
-apiVersion: v1
-kind: PersistentVolumeClaim
-metadata:
-  name: test-vitastor-pvc
-spec:
-  storageClassName: vitastor
-  accessModes:
-    - ReadWriteOnce
-  resources:
-    requests:
-      storage: 10Gi

csi/go.mod

@@ -1,35 +0,0 @@
-module vitastor.io/csi
-
-go 1.15
-
-require (
-	github.com/container-storage-interface/spec v1.4.0
-	github.com/coreos/bbolt v0.0.0-00010101000000-000000000000 // indirect
-	github.com/coreos/etcd v3.3.25+incompatible // indirect
-	github.com/coreos/go-semver v0.3.0 // indirect
-	github.com/coreos/go-systemd v0.0.0-20191104093116-d3cd4ed1dbcf // indirect
-	github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f // indirect
-	github.com/dustin/go-humanize v1.0.0 // indirect
-	github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b
-	github.com/gorilla/websocket v1.4.2 // indirect
-	github.com/grpc-ecosystem/go-grpc-middleware v1.3.0 // indirect
-	github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0 // indirect
-	github.com/grpc-ecosystem/grpc-gateway v1.16.0 // indirect
-	github.com/jonboulle/clockwork v0.2.2 // indirect
-	github.com/kubernetes-csi/csi-lib-utils v0.9.1
-	github.com/soheilhy/cmux v0.1.5 // indirect
-	github.com/tmc/grpc-websocket-proxy v0.0.0-20201229170055-e5319fda7802 // indirect
-	github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2 // indirect
-	go.etcd.io/bbolt v0.0.0-00010101000000-000000000000 // indirect
-	go.etcd.io/etcd v3.3.25+incompatible
-	golang.org/x/net v0.0.0-20201202161906-c7110b5ffcbb
-	google.golang.org/grpc v1.33.1
-	k8s.io/klog v1.0.0
-	k8s.io/utils v0.0.0-20210305010621-2afb4311ab10
-)
-
-replace github.com/coreos/bbolt => go.etcd.io/bbolt v1.3.5
-
-replace go.etcd.io/bbolt => github.com/coreos/bbolt v1.3.5
-
-replace google.golang.org/grpc => google.golang.org/grpc v1.25.1

csi/src/config.go

@@ -1,22 +0,0 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
-
-package vitastor
-
-const (
-    vitastorCSIDriverName    = "csi.vitastor.io"
-    vitastorCSIDriverVersion = "0.6.5"
-)
-
-// Config struct fills the parameters of request or user input
-type Config struct
-{
-    Endpoint string
-    NodeID   string
-}
-
-// NewConfig returns config struct to initialize new driver
-func NewConfig() *Config
-{
-    return &Config{}
-}

csi/src/controllerserver.go

@@ -1,530 +0,0 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
-
-package vitastor
-
-import (
-    "context"
-    "encoding/json"
-    "strings"
-    "bytes"
-    "strconv"
-    "time"
-    "fmt"
-    "os"
-    "os/exec"
-    "io/ioutil"
-
-    "github.com/kubernetes-csi/csi-lib-utils/protosanitizer"
-    "k8s.io/klog"
-
-    "google.golang.org/grpc/codes"
-    "google.golang.org/grpc/status"
-
-    "go.etcd.io/etcd/clientv3"
-
-    "github.com/container-storage-interface/spec/lib/go/csi"
-)
-
-const (
-    KB int64 = 1024
-    MB int64 = 1024 * KB
-    GB int64 = 1024 * MB
-    TB int64 = 1024 * GB
-    ETCD_TIMEOUT time.Duration = 15*time.Second
-)
-
-type InodeIndex struct
-{
-    Id uint64 `json:"id"`
-    PoolId uint64 `json:"pool_id"`
-}
-
-type InodeConfig struct
-{
-    Name string `json:"name"`
-    Size uint64 `json:"size,omitempty"`
-    ParentPool uint64 `json:"parent_pool,omitempty"`
-    ParentId uint64 `json:"parent_id,omitempty"`
-    Readonly bool `json:"readonly,omitempty"`
-}
-
-type ControllerServer struct
-{
-    *Driver
-}
-
-// NewControllerServer create new instance controller
-func NewControllerServer(driver *Driver) *ControllerServer
-{
-    return &ControllerServer{
-        Driver: driver,
-    }
-}
-
-func GetConnectionParams(params map[string]string) (map[string]string, []string, string)
-{
-    ctxVars := make(map[string]string)
-    configPath := params["configPath"]
-    if (configPath == "")
-    {
-        configPath = "/etc/vitastor/vitastor.conf"
-    }
-    else
-    {
-        ctxVars["configPath"] = configPath
-    }
-    config := make(map[string]interface{})
-    if configFD, err := os.Open(configPath); err == nil
-    {
-        defer configFD.Close()
-        data, _ := ioutil.ReadAll(configFD)
-        json.Unmarshal(data, &config)
-    }
-    // Try to load prefix & etcd URL from the config
-    var etcdUrl []string
-    if (params["etcdUrl"] != "")
-    {
-        ctxVars["etcdUrl"] = params["etcdUrl"]
-        etcdUrl = strings.Split(params["etcdUrl"], ",")
-    }
-    if (len(etcdUrl) == 0)
-    {
-        switch config["etcd_address"].(type)
-        {
-        case string:
-            etcdUrl = strings.Split(config["etcd_address"].(string), ",")
-        case []string:
-            etcdUrl = config["etcd_address"].([]string)
-        }
-    }
-    etcdPrefix := params["etcdPrefix"]
-    if (etcdPrefix == "")
-    {
-        etcdPrefix, _ = config["etcd_prefix"].(string)
-        if (etcdPrefix == "")
-        {
-            etcdPrefix = "/vitastor"
-        }
-    }
-    else
-    {
-        ctxVars["etcdPrefix"] = etcdPrefix
-    }
-    return ctxVars, etcdUrl, etcdPrefix
-}
-
-// Create the volume
-func (cs *ControllerServer) CreateVolume(ctx context.Context, req *csi.CreateVolumeRequest) (*csi.CreateVolumeResponse, error)
-{
-    klog.Infof("received controller create volume request %+v", protosanitizer.StripSecrets(req))
-    if (req == nil)
-    {
-        return nil, status.Errorf(codes.InvalidArgument, "request cannot be empty")
-    }
-    if (req.GetName() == "")
-    {
-        return nil, status.Error(codes.InvalidArgument, "name is a required field")
-    }
-    volumeCapabilities := req.GetVolumeCapabilities()
-    if (volumeCapabilities == nil)
-    {
-        return nil, status.Error(codes.InvalidArgument, "volume capabilities is a required field")
-    }
-
-    etcdVolumePrefix := req.Parameters["etcdVolumePrefix"]
-    poolId, _ := strconv.ParseUint(req.Parameters["poolId"], 10, 64)
-    if (poolId == 0)
-    {
-        return nil, status.Error(codes.InvalidArgument, "poolId is missing in storage class configuration")
-    }
-
-    volName := etcdVolumePrefix + req.GetName()
-    volSize := 1 * GB
-    if capRange := req.GetCapacityRange(); capRange != nil
-    {
-        volSize = ((capRange.GetRequiredBytes() + MB - 1) / MB) * MB
-    }
-
-    // FIXME: The following should PROBABLY be implemented externally in a management tool
-
-    ctxVars, etcdUrl, etcdPrefix := GetConnectionParams(req.Parameters)
-    if (len(etcdUrl) == 0)
-    {
-        return nil, status.Error(codes.InvalidArgument, "no etcdUrl in storage class configuration and no etcd_address in vitastor.conf")
-    }
-
-    // Connect to etcd
-    cli, err := clientv3.New(clientv3.Config{
-        DialTimeout: ETCD_TIMEOUT,
-        Endpoints: etcdUrl,
-    })
-    if (err != nil)
-    {
-        return nil, status.Error(codes.Internal, "failed to connect to etcd at "+strings.Join(etcdUrl, ",")+": "+err.Error())
-    }
-    defer cli.Close()
-
-    var imageId uint64 = 0
-    for
-    {
-        // Check if the image exists
-        ctx, cancel := context.WithTimeout(context.Background(), ETCD_TIMEOUT)
-        resp, err := cli.Get(ctx, etcdPrefix+"/index/image/"+volName)
-        cancel()
-        if (err != nil)
-        {
-            return nil, status.Error(codes.Internal, "failed to read key from etcd: "+err.Error())
-        }
-        if (len(resp.Kvs) > 0)
-        {
-            kv := resp.Kvs[0]
-            var v InodeIndex
-            err := json.Unmarshal(kv.Value, &v)
-            if (err != nil)
-            {
-                return nil, status.Error(codes.Internal, "invalid /index/image/"+volName+" key in etcd: "+err.Error())
-            }
-            poolId = v.PoolId
-            imageId = v.Id
-            inodeCfgKey := fmt.Sprintf("/config/inode/%d/%d", poolId, imageId)
-            ctx, cancel := context.WithTimeout(context.Background(), ETCD_TIMEOUT)
-            resp, err := cli.Get(ctx, etcdPrefix+inodeCfgKey)
-            cancel()
-            if (err != nil)
-            {
-                return nil, status.Error(codes.Internal, "failed to read key from etcd: "+err.Error())
-            }
-            if (len(resp.Kvs) == 0)
-            {
-                return nil, status.Error(codes.Internal, "missing "+inodeCfgKey+" key in etcd")
-            }
-            var inodeCfg InodeConfig
-            err = json.Unmarshal(resp.Kvs[0].Value, &inodeCfg)
-            if (err != nil)
-            {
-                return nil, status.Error(codes.Internal, "invalid "+inodeCfgKey+" key in etcd: "+err.Error())
-            }
-            if (inodeCfg.Size < uint64(volSize))
-            {
-                return nil, status.Error(codes.Internal, "image "+volName+" is already created, but size is less than expected")
-            }
-        }
-        else
-        {
-            // Find a free ID
-            // Create image metadata in a transaction verifying that the image doesn't exist yet AND ID is still free
-            maxIdKey := fmt.Sprintf("%s/index/maxid/%d", etcdPrefix, poolId)
-            ctx, cancel := context.WithTimeout(context.Background(), ETCD_TIMEOUT)
-            resp, err := cli.Get(ctx, maxIdKey)
-            cancel()
-            if (err != nil)
-            {
-                return nil, status.Error(codes.Internal, "failed to read key from etcd: "+err.Error())
-            }
-            var modRev int64
-            var nextId uint64
-            if (len(resp.Kvs) > 0)
-            {
-                var err error
-                nextId, err = strconv.ParseUint(string(resp.Kvs[0].Value), 10, 64)
-                if (err != nil)
-                {
-                    return nil, status.Error(codes.Internal, maxIdKey+" contains invalid ID")
-                }
-                modRev = resp.Kvs[0].ModRevision
-                nextId++
-            }
-            else
-            {
-                nextId = 1
-            }
-            inodeIdxJson, _ := json.Marshal(InodeIndex{
-                Id: nextId,
-                PoolId: poolId,
-            })
-            inodeCfgJson, _ := json.Marshal(InodeConfig{
-                Name: volName,
-                Size: uint64(volSize),
-            })
-            ctx, cancel = context.WithTimeout(context.Background(), ETCD_TIMEOUT)
-            txnResp, err := cli.Txn(ctx).If(
-                clientv3.Compare(clientv3.ModRevision(fmt.Sprintf("%s/index/maxid/%d", etcdPrefix, poolId)), "=", modRev),
-                clientv3.Compare(clientv3.CreateRevision(fmt.Sprintf("%s/index/image/%s", etcdPrefix, volName)), "=", 0),
-                clientv3.Compare(clientv3.CreateRevision(fmt.Sprintf("%s/config/inode/%d/%d", etcdPrefix, poolId, nextId)), "=", 0),
-            ).Then(
-                clientv3.OpPut(fmt.Sprintf("%s/index/maxid/%d", etcdPrefix, poolId), fmt.Sprintf("%d", nextId)),
-                clientv3.OpPut(fmt.Sprintf("%s/index/image/%s", etcdPrefix, volName), string(inodeIdxJson)),
-                clientv3.OpPut(fmt.Sprintf("%s/config/inode/%d/%d", etcdPrefix, poolId, nextId), string(inodeCfgJson)),
-            ).Commit()
-            cancel()
-            if (err != nil)
-            {
-                return nil, status.Error(codes.Internal, "failed to commit transaction in etcd: "+err.Error())
-            }
-            if (txnResp.Succeeded)
-            {
-                imageId = nextId
-                break
-            }
-            // Start over if the transaction fails
-        }
-    }
-
-    ctxVars["name"] = volName
-    volumeIdJson, _ := json.Marshal(ctxVars)
-    return &csi.CreateVolumeResponse{
-        Volume: &csi.Volume{
-            // Ugly, but VolumeContext isn't passed to DeleteVolume :-(
-            VolumeId: string(volumeIdJson),
-            CapacityBytes: volSize,
-        },
-    }, nil
-}
-
-// DeleteVolume deletes the given volume
-func (cs *ControllerServer) DeleteVolume(ctx context.Context, req *csi.DeleteVolumeRequest) (*csi.DeleteVolumeResponse, error)
-{
-    klog.Infof("received controller delete volume request %+v", protosanitizer.StripSecrets(req))
-    if (req == nil)
-    {
-        return nil, status.Error(codes.InvalidArgument, "request cannot be empty")
-    }
-
-    ctxVars := make(map[string]string)
-    err := json.Unmarshal([]byte(req.VolumeId), &ctxVars)
-    if (err != nil)
-    {
-        return nil, status.Error(codes.Internal, "volume ID not in JSON format")
-    }
-    volName := ctxVars["name"]
-
-    _, etcdUrl, etcdPrefix := GetConnectionParams(ctxVars)
-    if (len(etcdUrl) == 0)
-    {
-        return nil, status.Error(codes.InvalidArgument, "no etcdUrl in storage class configuration and no etcd_address in vitastor.conf")
-    }
-
-    cli, err := clientv3.New(clientv3.Config{
-        DialTimeout: ETCD_TIMEOUT,
-        Endpoints: etcdUrl,
-    })
-    if (err != nil)
-    {
-        return nil, status.Error(codes.Internal, "failed to connect to etcd at "+strings.Join(etcdUrl, ",")+": "+err.Error())
-    }
-    defer cli.Close()
-
-    // Find inode by name
-    ctx, cancel := context.WithTimeout(context.Background(), ETCD_TIMEOUT)
-    resp, err := cli.Get(ctx, etcdPrefix+"/index/image/"+volName)
-    cancel()
-    if (err != nil)
-    {
-        return nil, status.Error(codes.Internal, "failed to read key from etcd: "+err.Error())
-    }
-    if (len(resp.Kvs) == 0)
-    {
-        return nil, status.Error(codes.NotFound, "volume "+volName+" does not exist")
-    }
-    var idx InodeIndex
-    err = json.Unmarshal(resp.Kvs[0].Value, &idx)
-    if (err != nil)
-    {
-        return nil, status.Error(codes.Internal, "invalid /index/image/"+volName+" key in etcd: "+err.Error())
-    }
-
-    // Get inode config
-    inodeCfgKey := fmt.Sprintf("%s/config/inode/%d/%d", etcdPrefix, idx.PoolId, idx.Id)
-    ctx, cancel = context.WithTimeout(context.Background(), ETCD_TIMEOUT)
-    resp, err = cli.Get(ctx, inodeCfgKey)
-    cancel()
-    if (err != nil)
-    {
-        return nil, status.Error(codes.Internal, "failed to read key from etcd: "+err.Error())
-    }
-    if (len(resp.Kvs) == 0)
-    {
-        return nil, status.Error(codes.NotFound, "volume "+volName+" does not exist")
-    }
-    var inodeCfg InodeConfig
-    err = json.Unmarshal(resp.Kvs[0].Value, &inodeCfg)
-    if (err != nil)
-    {
-        return nil, status.Error(codes.Internal, "invalid "+inodeCfgKey+" key in etcd: "+err.Error())
-    }
-
-    // Delete inode data by invoking vitastor-rm
-    args := []string{
-        "--etcd_address", strings.Join(etcdUrl, ","),
-        "--pool", fmt.Sprintf("%d", idx.PoolId),
-        "--inode", fmt.Sprintf("%d", idx.Id),
-    }
-    if (ctxVars["configPath"] != "")
-    {
-        args = append(args, "--config_path", ctxVars["configPath"])
-    }
-    c := exec.Command("/usr/bin/vitastor-rm", args...)
-    var stderr bytes.Buffer
-    c.Stdout = nil
-    c.Stderr = &stderr
-    err = c.Run()
-    stderrStr := string(stderr.Bytes())
-    if (err != nil)
-    {
-        klog.Errorf("vitastor-rm failed: %s, status %s\n", stderrStr, err)
-        return nil, status.Error(codes.Internal, stderrStr+" (status "+err.Error()+")")
-    }
-
-    // Delete inode config in etcd
-    ctx, cancel = context.WithTimeout(context.Background(), ETCD_TIMEOUT)
-    txnResp, err := cli.Txn(ctx).Then(
-        clientv3.OpDelete(fmt.Sprintf("%s/index/image/%s", etcdPrefix, volName)),
-        clientv3.OpDelete(fmt.Sprintf("%s/config/inode/%d/%d", etcdPrefix, idx.PoolId, idx.Id)),
-    ).Commit()
-    cancel()
-    if (err != nil)
-    {
-        return nil, status.Error(codes.Internal, "failed to delete keys in etcd: "+err.Error())
-    }
-    if (!txnResp.Succeeded)
-    {
-        return nil, status.Error(codes.Internal, "failed to delete keys in etcd: transaction failed")
-    }
-
-    return &csi.DeleteVolumeResponse{}, nil
-}
-
-// ControllerPublishVolume return Unimplemented error
-func (cs *ControllerServer) ControllerPublishVolume(ctx context.Context, req *csi.ControllerPublishVolumeRequest) (*csi.ControllerPublishVolumeResponse, error)
-{
-    return nil, status.Error(codes.Unimplemented, "")
-}
-
-// ControllerUnpublishVolume return Unimplemented error
-func (cs *ControllerServer) ControllerUnpublishVolume(ctx context.Context, req *csi.ControllerUnpublishVolumeRequest) (*csi.ControllerUnpublishVolumeResponse, error)
-{
-    return nil, status.Error(codes.Unimplemented, "")
-}
-
-// ValidateVolumeCapabilities checks whether the volume capabilities requested are supported.
-func (cs *ControllerServer) ValidateVolumeCapabilities(ctx context.Context, req *csi.ValidateVolumeCapabilitiesRequest) (*csi.ValidateVolumeCapabilitiesResponse, error)
-{
-    klog.Infof("received controller validate volume capability request %+v", protosanitizer.StripSecrets(req))
-    if (req == nil)
-    {
-        return nil, status.Errorf(codes.InvalidArgument, "request is nil")
-    }
-    volumeID := req.GetVolumeId()
-    if (volumeID == "")
-    {
-        return nil, status.Error(codes.InvalidArgument, "volumeId is nil")
-    }
-    volumeCapabilities := req.GetVolumeCapabilities()
-    if (volumeCapabilities == nil)
-    {
-        return nil, status.Error(codes.InvalidArgument, "volumeCapabilities is nil")
-    }
-
-    var volumeCapabilityAccessModes []*csi.VolumeCapability_AccessMode
-    for _, mode := range []csi.VolumeCapability_AccessMode_Mode{
-        csi.VolumeCapability_AccessMode_SINGLE_NODE_WRITER,
-        csi.VolumeCapability_AccessMode_MULTI_NODE_MULTI_WRITER,
-    } {
-        volumeCapabilityAccessModes = append(volumeCapabilityAccessModes, &csi.VolumeCapability_AccessMode{Mode: mode})
-    }
-
-    capabilitySupport := false
-    for _, capability := range volumeCapabilities
-    {
-        for _, volumeCapabilityAccessMode := range volumeCapabilityAccessModes
-        {
-            if (volumeCapabilityAccessMode.Mode == capability.AccessMode.Mode)
-            {
-                capabilitySupport = true
-            }
-        }
-    }
-
-    if (!capabilitySupport)
-    {
-        return nil, status.Errorf(codes.NotFound, "%v not supported", req.GetVolumeCapabilities())
-    }
-
-    return &csi.ValidateVolumeCapabilitiesResponse{
-        Confirmed: &csi.ValidateVolumeCapabilitiesResponse_Confirmed{
-            VolumeCapabilities: req.VolumeCapabilities,
-        },
-    }, nil
-}
-
-// ListVolumes returns a list of volumes
-func (cs *ControllerServer) ListVolumes(ctx context.Context, req *csi.ListVolumesRequest) (*csi.ListVolumesResponse, error)
-{
-    return nil, status.Error(codes.Unimplemented, "")
-}
-
-// GetCapacity returns the capacity of the storage pool
-func (cs *ControllerServer) GetCapacity(ctx context.Context, req *csi.GetCapacityRequest) (*csi.GetCapacityResponse, error)
-{
-    return nil, status.Error(codes.Unimplemented, "")
-}
-
-// ControllerGetCapabilities returns the capabilities of the controller service.
-func (cs *ControllerServer) ControllerGetCapabilities(ctx context.Context, req *csi.ControllerGetCapabilitiesRequest) (*csi.ControllerGetCapabilitiesResponse, error)
-{
-    functionControllerServerCapabilities := func(cap csi.ControllerServiceCapability_RPC_Type) *csi.ControllerServiceCapability
-    {
-        return &csi.ControllerServiceCapability{
-            Type: &csi.ControllerServiceCapability_Rpc{
-                Rpc: &csi.ControllerServiceCapability_RPC{
-                    Type: cap,
-                },
-            },
-        }
-    }
-
-    var controllerServerCapabilities []*csi.ControllerServiceCapability
-    for _, capability := range []csi.ControllerServiceCapability_RPC_Type{
-        csi.ControllerServiceCapability_RPC_CREATE_DELETE_VOLUME,
-        csi.ControllerServiceCapability_RPC_LIST_VOLUMES,
-        csi.ControllerServiceCapability_RPC_EXPAND_VOLUME,
-        csi.ControllerServiceCapability_RPC_CREATE_DELETE_SNAPSHOT,
-    } {
-        controllerServerCapabilities = append(controllerServerCapabilities, functionControllerServerCapabilities(capability))
-    }
-
-    return &csi.ControllerGetCapabilitiesResponse{
-        Capabilities: controllerServerCapabilities,
-    }, nil
-}
-
-// CreateSnapshot create snapshot of an existing PV
-func (cs *ControllerServer) CreateSnapshot(ctx context.Context, req *csi.CreateSnapshotRequest) (*csi.CreateSnapshotResponse, error)
-{
-    return nil, status.Error(codes.Unimplemented, "")
-}
-
-// DeleteSnapshot delete provided snapshot of a PV
-func (cs *ControllerServer) DeleteSnapshot(ctx context.Context, req *csi.DeleteSnapshotRequest) (*csi.DeleteSnapshotResponse, error)
-{
-    return nil, status.Error(codes.Unimplemented, "")
-}
-
-// ListSnapshots list the snapshots of a PV
-func (cs *ControllerServer) ListSnapshots(ctx context.Context, req *csi.ListSnapshotsRequest) (*csi.ListSnapshotsResponse, error)
-{
-    return nil, status.Error(codes.Unimplemented, "")
-}
-
-// ControllerExpandVolume resizes a volume
-func (cs *ControllerServer) ControllerExpandVolume(ctx context.Context, req *csi.ControllerExpandVolumeRequest) (*csi.ControllerExpandVolumeResponse, error)
-{
-    return nil, status.Error(codes.Unimplemented, "")
-}
-
-// ControllerGetVolume get volume info
-func (cs *ControllerServer) ControllerGetVolume(ctx context.Context, req *csi.ControllerGetVolumeRequest) (*csi.ControllerGetVolumeResponse, error)
-{
-    return nil, status.Error(codes.Unimplemented, "")
-}

csi/src/grpc.go

@@ -1,137 +0,0 @@
-/*
-Copyright 2017 The Kubernetes Authors.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-package vitastor
-
-import (
-    "fmt"
-    "net"
-    "os"
-    "strings"
-    "sync"
-
-    "github.com/golang/glog"
-    "golang.org/x/net/context"
-    "google.golang.org/grpc"
-
-    "github.com/container-storage-interface/spec/lib/go/csi"
-    "github.com/kubernetes-csi/csi-lib-utils/protosanitizer"
-)
-
-// Defines Non blocking GRPC server interfaces
-type NonBlockingGRPCServer interface {
-    // Start services at the endpoint
-    Start(endpoint string, ids csi.IdentityServer, cs csi.ControllerServer, ns csi.NodeServer)
-    // Waits for the service to stop
-    Wait()
-    // Stops the service gracefully
-    Stop()
-    // Stops the service forcefully
-    ForceStop()
-}
-
-func NewNonBlockingGRPCServer() NonBlockingGRPCServer {
-    return &nonBlockingGRPCServer{}
-}
-
-// NonBlocking server
-type nonBlockingGRPCServer struct {
-    wg     sync.WaitGroup
-    server *grpc.Server
-}
-
-func (s *nonBlockingGRPCServer) Start(endpoint string, ids csi.IdentityServer, cs csi.ControllerServer, ns csi.NodeServer) {
-
-    s.wg.Add(1)
-
-    go s.serve(endpoint, ids, cs, ns)
-
-    return
-}
-
-func (s *nonBlockingGRPCServer) Wait() {
-    s.wg.Wait()
-}
-
-func (s *nonBlockingGRPCServer) Stop() {
-    s.server.GracefulStop()
-}
-
-func (s *nonBlockingGRPCServer) ForceStop() {
-    s.server.Stop()
-}
-
-func (s *nonBlockingGRPCServer) serve(endpoint string, ids csi.IdentityServer, cs csi.ControllerServer, ns csi.NodeServer) {
-
-    proto, addr, err := ParseEndpoint(endpoint)
-    if err != nil {
-        glog.Fatal(err.Error())
-    }
-
-    if proto == "unix" {
-        addr = "/" + addr
-        if err := os.Remove(addr); err != nil && !os.IsNotExist(err) {
-            glog.Fatalf("Failed to remove %s, error: %s", addr, err.Error())
-        }
-    }
-
-    listener, err := net.Listen(proto, addr)
-    if err != nil {
-        glog.Fatalf("Failed to listen: %v", err)
-    }
-
-    opts := []grpc.ServerOption{
-        grpc.UnaryInterceptor(logGRPC),
-    }
-    server := grpc.NewServer(opts...)
-    s.server = server
-
-    if ids != nil {
-        csi.RegisterIdentityServer(server, ids)
-    }
-    if cs != nil {
-        csi.RegisterControllerServer(server, cs)
-    }
-    if ns != nil {
-        csi.RegisterNodeServer(server, ns)
-    }
-
-    glog.Infof("Listening for connections on address: %#v", listener.Addr())
-
-    server.Serve(listener)
-}
-
-func ParseEndpoint(ep string) (string, string, error) {
-    if strings.HasPrefix(strings.ToLower(ep), "unix://") || strings.HasPrefix(strings.ToLower(ep), "tcp://") {
-        s := strings.SplitN(ep, "://", 2)
-        if s[1] != "" {
-            return s[0], s[1], nil
-        }
-    }
-    return "", "", fmt.Errorf("Invalid endpoint: %v", ep)
-}
-
-func logGRPC(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
-    glog.V(3).Infof("GRPC call: %s", info.FullMethod)
-    glog.V(5).Infof("GRPC request: %s", protosanitizer.StripSecrets(req))
-    resp, err := handler(ctx, req)
-    if err != nil {
-        glog.Errorf("GRPC error: %v", err)
-    } else {
-        glog.V(5).Infof("GRPC response: %s", protosanitizer.StripSecrets(resp))
-    }
-    return resp, err
-}

csi/src/identityserver.go

@@ -1,60 +0,0 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
-
-package vitastor
-
-import (
-    "context"
-
-    "github.com/kubernetes-csi/csi-lib-utils/protosanitizer"
-    "k8s.io/klog"
-
-    "github.com/container-storage-interface/spec/lib/go/csi"
-)
-
-// IdentityServer struct of Vitastor CSI driver with supported methods of CSI identity server spec.
-type IdentityServer struct
-{
-    *Driver
-}
-
-// NewIdentityServer create new instance identity
-func NewIdentityServer(driver *Driver) *IdentityServer
-{
-    return &IdentityServer{
-        Driver: driver,
-    }
-}
-
-// GetPluginInfo returns metadata of the plugin
-func (is *IdentityServer) GetPluginInfo(ctx context.Context, req *csi.GetPluginInfoRequest) (*csi.GetPluginInfoResponse, error)
-{
-    klog.Infof("received identity plugin info request %+v", protosanitizer.StripSecrets(req))
-    return &csi.GetPluginInfoResponse{
-        Name:          vitastorCSIDriverName,
-        VendorVersion: vitastorCSIDriverVersion,
-    }, nil
-}
-
-// GetPluginCapabilities returns available capabilities of the plugin
-func (is *IdentityServer) GetPluginCapabilities(ctx context.Context, req *csi.GetPluginCapabilitiesRequest) (*csi.GetPluginCapabilitiesResponse, error)
-{
-    klog.Infof("received identity plugin capabilities request %+v", protosanitizer.StripSecrets(req))
-    return &csi.GetPluginCapabilitiesResponse{
-        Capabilities: []*csi.PluginCapability{
-            {
-                Type: &csi.PluginCapability_Service_{
-                    Service: &csi.PluginCapability_Service{
-                        Type: csi.PluginCapability_Service_CONTROLLER_SERVICE,
-                    },
-                },
-            },
-        },
-    }, nil
-}
-
-// Probe returns the health and readiness of the plugin
-func (is *IdentityServer) Probe(ctx context.Context, req *csi.ProbeRequest) (*csi.ProbeResponse, error)
-{
-    return &csi.ProbeResponse{}, nil
-}

csi/src/nodeserver.go

@@ -1,279 +0,0 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
-
-package vitastor
-
-import (
-    "context"
-    "os"
-    "os/exec"
-    "encoding/json"
-    "strings"
-    "bytes"
-
-    "google.golang.org/grpc/codes"
-    "google.golang.org/grpc/status"
-    "k8s.io/utils/mount"
-    utilexec "k8s.io/utils/exec"
-
-    "github.com/container-storage-interface/spec/lib/go/csi"
-    "github.com/kubernetes-csi/csi-lib-utils/protosanitizer"
-    "k8s.io/klog"
-)
-
-// NodeServer struct of Vitastor CSI driver with supported methods of CSI node server spec.
-type NodeServer struct
-{
-    *Driver
-    mounter mount.Interface
-}
-
-// NewNodeServer create new instance node
-func NewNodeServer(driver *Driver) *NodeServer
-{
-    return &NodeServer{
-        Driver: driver,
-        mounter: mount.New(""),
-    }
-}
-
-// NodeStageVolume mounts the volume to a staging path on the node.
-func (ns *NodeServer) NodeStageVolume(ctx context.Context, req *csi.NodeStageVolumeRequest) (*csi.NodeStageVolumeResponse, error)
-{
-    return &csi.NodeStageVolumeResponse{}, nil
-}
-
-// NodeUnstageVolume unstages the volume from the staging path
-func (ns *NodeServer) NodeUnstageVolume(ctx context.Context, req *csi.NodeUnstageVolumeRequest) (*csi.NodeUnstageVolumeResponse, error)
-{
-    return &csi.NodeUnstageVolumeResponse{}, nil
-}
-
-func Contains(list []string, s string) bool
-{
-    for i := 0; i < len(list); i++
-    {
-        if (list[i] == s)
-        {
-            return true
-        }
-    }
-    return false
-}
-
-// NodePublishVolume mounts the volume mounted to the staging path to the target path
-func (ns *NodeServer) NodePublishVolume(ctx context.Context, req *csi.NodePublishVolumeRequest) (*csi.NodePublishVolumeResponse, error)
-{
-    klog.Infof("received node publish volume request %+v", protosanitizer.StripSecrets(req))
-
-    targetPath := req.GetTargetPath()
-
-    // Check that it's not already mounted
-    free, error := mount.IsNotMountPoint(ns.mounter, targetPath)
-    if (error != nil)
-    {
-        if (os.IsNotExist(error))
-        {
-            error := os.MkdirAll(targetPath, 0777)
-            if (error != nil)
-            {
-                return nil, status.Error(codes.Internal, error.Error())
-            }
-            free = true
-        }
-        else
-        {
-            return nil, status.Error(codes.Internal, error.Error())
-        }
-    }
-    if (!free)
-    {
-        return &csi.NodePublishVolumeResponse{}, nil
-    }
-
-    ctxVars := make(map[string]string)
-    err := json.Unmarshal([]byte(req.VolumeId), &ctxVars)
-    if (err != nil)
-    {
-        return nil, status.Error(codes.Internal, "volume ID not in JSON format")
-    }
-    volName := ctxVars["name"]
-
-    _, etcdUrl, etcdPrefix := GetConnectionParams(ctxVars)
-    if (len(etcdUrl) == 0)
-    {
-        return nil, status.Error(codes.InvalidArgument, "no etcdUrl in storage class configuration and no etcd_address in vitastor.conf")
-    }
-
-    // Map NBD device
-    // FIXME: Check if already mapped
-    args := []string{
-        "map", "--etcd_address", strings.Join(etcdUrl, ","),
-        "--etcd_prefix", etcdPrefix,
-        "--image", volName,
-    };
-    if (ctxVars["configPath"] != "")
-    {
-        args = append(args, "--config_path", ctxVars["configPath"])
-    }
-    if (req.GetReadonly())
-    {
-        args = append(args, "--readonly", "1")
-    }
-    c := exec.Command("/usr/bin/vitastor-nbd", args...)
-    var stdout, stderr bytes.Buffer
-    c.Stdout, c.Stderr = &stdout, &stderr
-    err = c.Run()
-    stdoutStr, stderrStr := string(stdout.Bytes()), string(stderr.Bytes())
-    if (err != nil)
-    {
-        klog.Errorf("vitastor-nbd map failed: %s, status %s\n", stdoutStr+stderrStr, err)
-        return nil, status.Error(codes.Internal, stdoutStr+stderrStr+" (status "+err.Error()+")")
-    }
-    devicePath := strings.TrimSpace(stdoutStr)
-
-    // Check existing format
-    diskMounter := &mount.SafeFormatAndMount{Interface: ns.mounter, Exec: utilexec.New()}
-    existingFormat, err := diskMounter.GetDiskFormat(devicePath)
-    if (err != nil)
-    {
-        klog.Errorf("failed to get disk format for path %s, error: %v", err)
-        // unmap NBD device
-        unmapOut, unmapErr := exec.Command("/usr/bin/vitastor-nbd", "unmap", devicePath).CombinedOutput()
-        if (unmapErr != nil)
-        {
-            klog.Errorf("failed to unmap NBD device %s: %s, error: %v", devicePath, unmapOut, unmapErr)
-        }
-        return nil, err
-    }
-
-    // Format the device (ext4 or xfs)
-    fsType := req.GetVolumeCapability().GetMount().GetFsType()
-    isBlock := req.GetVolumeCapability().GetBlock() != nil
-    opt := req.GetVolumeCapability().GetMount().GetMountFlags()
-    opt = append(opt, "_netdev")
-    if ((req.VolumeCapability.AccessMode.Mode == csi.VolumeCapability_AccessMode_MULTI_NODE_READER_ONLY ||
-        req.VolumeCapability.AccessMode.Mode == csi.VolumeCapability_AccessMode_SINGLE_NODE_READER_ONLY) &&
-        !Contains(opt, "ro"))
-    {
-        opt = append(opt, "ro")
-    }
-    if (fsType == "xfs")
-    {
-        opt = append(opt, "nouuid")
-    }
-    readOnly := Contains(opt, "ro")
-    if (existingFormat == "" && !readOnly)
-    {
-        args := []string{}
-        switch fsType
-        {
-            case "ext4":
-                args = []string{"-m0", "-Enodiscard,lazy_itable_init=1,lazy_journal_init=1", devicePath}
-            case "xfs":
-                args = []string{"-K", devicePath}
-        }
-        if (len(args) > 0)
-        {
-            cmdOut, cmdErr := diskMounter.Exec.Command("mkfs."+fsType, args...).CombinedOutput()
-            if (cmdErr != nil)
-            {
-                klog.Errorf("failed to run mkfs error: %v, output: %v", cmdErr, string(cmdOut))
-                // unmap NBD device
-                unmapOut, unmapErr := exec.Command("/usr/bin/vitastor-nbd", "unmap", devicePath).CombinedOutput()
-                if (unmapErr != nil)
-                {
-                    klog.Errorf("failed to unmap NBD device %s: %s, error: %v", devicePath, unmapOut, unmapErr)
-                }
-                return nil, status.Error(codes.Internal, cmdErr.Error())
-            }
-        }
-    }
-    if (isBlock)
-    {
-        opt = append(opt, "bind")
-        err = diskMounter.Mount(devicePath, targetPath, fsType, opt)
-    }
-    else
-    {
-        err = diskMounter.FormatAndMount(devicePath, targetPath, fsType, opt)
-    }
-    if (err != nil)
-    {
-        klog.Errorf(
-            "failed to mount device path (%s) to path (%s) for volume (%s) error: %s",
-            devicePath, targetPath, volName, err,
-        )
-        // unmap NBD device
-        unmapOut, unmapErr := exec.Command("/usr/bin/vitastor-nbd", "unmap", devicePath).CombinedOutput()
-        if (unmapErr != nil)
-        {
-            klog.Errorf("failed to unmap NBD device %s: %s, error: %v", devicePath, unmapOut, unmapErr)
-        }
-        return nil, status.Error(codes.Internal, err.Error())
-    }
-    return &csi.NodePublishVolumeResponse{}, nil
-}
-
-// NodeUnpublishVolume unmounts the volume from the target path
-func (ns *NodeServer) NodeUnpublishVolume(ctx context.Context, req *csi.NodeUnpublishVolumeRequest) (*csi.NodeUnpublishVolumeResponse, error)
-{
-    klog.Infof("received node unpublish volume request %+v", protosanitizer.StripSecrets(req))
-    targetPath := req.GetTargetPath()
-    devicePath, refCount, err := mount.GetDeviceNameFromMount(ns.mounter, targetPath)
-    if (err != nil)
-    {
-        if (os.IsNotExist(err))
-        {
-            return nil, status.Error(codes.NotFound, "Target path not found")
-        }
-        return nil, status.Error(codes.Internal, err.Error())
-    }
-    if (devicePath == "")
-    {
-        return nil, status.Error(codes.NotFound, "Volume not mounted")
-    }
-    // unmount
-    err = mount.CleanupMountPoint(targetPath, ns.mounter, false)
-    if (err != nil)
-    {
-        return nil, status.Error(codes.Internal, err.Error())
-    }
-    // unmap NBD device
-    if (refCount == 1)
-    {
-        unmapOut, unmapErr := exec.Command("/usr/bin/vitastor-nbd", "unmap", devicePath).CombinedOutput()
-        if (unmapErr != nil)
-        {
-            klog.Errorf("failed to unmap NBD device %s: %s, error: %v", devicePath, unmapOut, unmapErr)
-        }
-    }
-    return &csi.NodeUnpublishVolumeResponse{}, nil
-}
-
-// NodeGetVolumeStats returns volume capacity statistics available for the volume
-func (ns *NodeServer) NodeGetVolumeStats(ctx context.Context, req *csi.NodeGetVolumeStatsRequest) (*csi.NodeGetVolumeStatsResponse, error)
-{
-    return nil, status.Error(codes.Unimplemented, "")
-}
-
-// NodeExpandVolume expanding the file system on the node
-func (ns *NodeServer) NodeExpandVolume(ctx context.Context, req *csi.NodeExpandVolumeRequest) (*csi.NodeExpandVolumeResponse, error)
-{
-    return nil, status.Error(codes.Unimplemented, "")
-}
-
-// NodeGetCapabilities returns the supported capabilities of the node server
-func (ns *NodeServer) NodeGetCapabilities(ctx context.Context, req *csi.NodeGetCapabilitiesRequest) (*csi.NodeGetCapabilitiesResponse, error)
-{
-    return &csi.NodeGetCapabilitiesResponse{}, nil
-}
-
-// NodeGetInfo returns NodeGetInfoResponse for CO.
-func (ns *NodeServer) NodeGetInfo(ctx context.Context, req *csi.NodeGetInfoRequest) (*csi.NodeGetInfoResponse, error)
-{
-    klog.Infof("received node get info request %+v", protosanitizer.StripSecrets(req))
-    return &csi.NodeGetInfoResponse{
-        NodeId: ns.NodeID,
-    }, nil
-}

csi/src/server.go

@@ -1,36 +0,0 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
-
-package vitastor
-
-import (
-    "k8s.io/klog"
-)
-
-type Driver struct
-{
-    *Config
-}
-
-// NewDriver create new instance driver
-func NewDriver(config *Config) (*Driver, error)
-{
-    if (config == nil)
-    {
-        klog.Errorf("Vitastor CSI driver initialization failed")
-        return nil, nil
-    }
-    driver := &Driver{
-        Config: config,
-    }
-    klog.Infof("Vitastor CSI driver initialized")
-    return driver, nil
-}
-
-// Start server
-func (driver *Driver) Run()
-{
-    server := NewNonBlockingGRPCServer()
-    server.Start(driver.Endpoint, NewIdentityServer(driver), NewControllerServer(driver), NewNodeServer(driver))
-    server.Wait()
-}

csi/vitastor-csi.go

@@ -1,39 +0,0 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
-
-package main
-
-import (
-    "flag"
-    "fmt"
-    "os"
-    "k8s.io/klog"
-    "vitastor.io/csi/src"
-)
-
-func main()
-{
-    var config = vitastor.NewConfig()
-    flag.StringVar(&config.Endpoint, "endpoint", "", "CSI endpoint")
-    flag.StringVar(&config.NodeID, "node", "", "Node ID")
-    flag.Parse()
-    if (config.Endpoint == "")
-    {
-        config.Endpoint = os.Getenv("CSI_ENDPOINT")
-    }
-    if (config.NodeID == "")
-    {
-        config.NodeID = os.Getenv("NODE_ID")
-    }
-    if (config.Endpoint == "" && config.NodeID == "")
-    {
-        fmt.Fprintf(os.Stderr, "Please set -endpoint and -node / CSI_ENDPOINT & NODE_ID env vars\n")
-        os.Exit(1)
-    }
-    drv, err := vitastor.NewDriver(config)
-    if (err != nil)
-    {
-        klog.Fatalln(err)
-    }
-    drv.Run()
-}

debian/build-vitastor-bullseye.sh

@@ -1,7 +0,0 @@
-#!/bin/bash
-
-sed 's/$REL/bullseye/g' < vitastor.Dockerfile > ../Dockerfile
-cd ..
-mkdir -p packages
-sudo podman build -v `pwd`/packages:/root/packages -f Dockerfile .
-rm Dockerfile

debian/build-vitastor-buster.sh

@@ -1,7 +0,0 @@
-#!/bin/bash
-
-sed 's/$REL/buster/g' < vitastor.Dockerfile > ../Dockerfile
-cd ..
-mkdir -p packages
-sudo podman build -v `pwd`/packages:/root/packages -f Dockerfile .
-rm Dockerfile

debian/changelog

@@ -1,27 +0,0 @@
-vitastor (0.6.5-1) unstable; urgency=medium
-
-  * RDMA support
-  * Bugfixes
-
- -- Vitaliy Filippov <vitalif@yourcmc.ru>  Sat, 01 May 2021 18:46:10 +0300
-
-vitastor (0.6.0-1) unstable; urgency=medium
-
-  * Snapshots and Copy-on-Write clones
-  * Image metadata in etcd (name, size)
-  * Image I/O and space statistics in etcd
-  * Write throttling for smoothing random write workloads in SSD+HDD configurations
-
- -- Vitaliy Filippov <vitalif@yourcmc.ru>  Sun, 11 Apr 2021 00:49:18 +0300
-
-vitastor (0.5.1-1) unstable; urgency=medium
-
-  * Add jerasure support
-
- -- Vitaliy Filippov <vitalif@yourcmc.ru>  Sat, 05 Dec 2020 17:02:26 +0300
-
-vitastor (0.5-1) unstable; urgency=medium
-
-  * First packaging for Debian
-
- -- Vitaliy Filippov <vitalif@yourcmc.ru>  Thu, 05 Nov 2020 02:20:59 +0300

debian/compat

@@ -1 +0,0 @@
-13

debian/control

@@ -1,17 +0,0 @@
-Source: vitastor
-Section: admin
-Priority: optional
-Maintainer: Vitaliy Filippov <vitalif@yourcmc.ru>
-Build-Depends: debhelper, liburing-dev (>= 0.6), g++ (>= 8), libstdc++6 (>= 8), linux-libc-dev, libgoogle-perftools-dev, libjerasure-dev, libgf-complete-dev, libibverbs-dev
-Standards-Version: 4.5.0
-Homepage: https://vitastor.io/
-Rules-Requires-Root: no
-
-Package: vitastor
-Architecture: amd64
-Depends: ${shlibs:Depends}, ${misc:Depends}, fio (= ${dep:fio}), qemu (= ${dep:qemu}), nodejs (>= 10), node-sprintf-js, node-ws (>= 7), libjerasure2, lp-solve
-Description: Vitastor, a fast software-defined clustered block storage
- Vitastor is a small, simple and fast clustered block storage (storage for VM drives),
- architecturally similar to Ceph which means strong consistency, primary-replication,
- symmetric clustering and automatic data distribution over any number of drives of any
- size with configurable redundancy (replication or erasure codes/XOR).

debian/copyright

@@ -1,21 +0,0 @@
-Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
-Upstream-Name: vitastor
-Upstream-Contact: Vitaliy Filippov <vitalif@yourcmc.ru>
-Source: https://vitastor.io
-
-Files: *
-Copyright: 2019+ Vitaliy Filippov <vitalif@yourcmc.ru>
-License: Multiple licenses VNPL-1.1 and/or GPL-2.0+
- All server-side code (OSD, Monitor and so on) is licensed under the terms of
- Vitastor Network Public License 1.1 (VNPL 1.1), a copyleft license based on
- GNU GPLv3.0 with the additional "Network Interaction" clause which requires
- opensourcing all programs directly or indirectly interacting with Vitastor
- through a computer network and expressly designed to be used in conjunction
- with it ("Proxy Programs"). Proxy Programs may be made public not only under
- the terms of the same license, but also under the terms of any GPL-Compatible
- Free Software License, as listed by the Free Software Foundation.
- This is a stricter copyleft license than the Affero GPL.
- .
- Client libraries (cluster_client and so on) are dual-licensed under the same
- VNPL 1.1 and also GNU GPL 2.0 or later to allow for compatibility with GPLed
- software like QEMU and fio.

debian/install

@@ -1,3 +0,0 @@
-VNPL-1.1.txt usr/share/doc/vitastor
-GPL-2.0.txt usr/share/doc/vitastor
-mon usr/lib/vitastor

debian/patched-qemu.Dockerfile

@@ -1,50 +0,0 @@
-# Build patched QEMU for Debian Buster or Bullseye/Sid inside a container
-# cd ..; podman build --build-arg REL=bullseye -v `pwd`/packages:/root/packages -f debian/patched-qemu.Dockerfile .
-
-FROM debian:$REL
-
-WORKDIR /root
-
-RUN if [ "$REL" = "buster" ]; then \
-        echo 'deb http://deb.debian.org/debian buster-backports main' >> /etc/apt/sources.list; \
-        echo >> /etc/apt/preferences; \
-        echo 'Package: *' >> /etc/apt/preferences; \
-        echo 'Pin: release a=buster-backports' >> /etc/apt/preferences; \
-        echo 'Pin-Priority: 500' >> /etc/apt/preferences; \
-        echo >> /etc/apt/preferences; \
-        echo 'Package: libglvnd* libgles* libglx* libgl1 libegl* libopengl* mesa*' >> /etc/apt/preferences; \
-        echo 'Pin: release a=buster-backports' >> /etc/apt/preferences; \
-        echo 'Pin-Priority: 50' >> /etc/apt/preferences; \
-    fi; \
-    grep '^deb ' /etc/apt/sources.list | perl -pe 's/^deb/deb-src/' >> /etc/apt/sources.list; \
-    echo 'APT::Install-Recommends false;' >> /etc/apt/apt.conf; \
-    echo 'APT::Install-Suggests false;' >> /etc/apt/apt.conf
-
-RUN apt-get update
-RUN apt-get -y install qemu fio liburing1 liburing-dev libgoogle-perftools-dev devscripts
-RUN apt-get -y build-dep qemu
-RUN apt-get -y build-dep fio
-# To build a custom version
-#RUN cp /root/packages/qemu-orig/* /root
-RUN apt-get --download-only source qemu
-RUN apt-get --download-only source fio
-
-ADD patches/qemu-5.0-vitastor.patch patches/qemu-5.1-vitastor.patch /root/vitastor/patches/
-RUN set -e; \
-    mkdir -p /root/packages/qemu-$REL; \
-    rm -rf /root/packages/qemu-$REL/*; \
-    cd /root/packages/qemu-$REL; \
-    dpkg-source -x /root/qemu*.dsc; \
-    if [ -d /root/packages/qemu-$REL/qemu-5.0 ]; then \
-        cp /root/vitastor/patches/qemu-5.0-vitastor.patch /root/packages/qemu-$REL/qemu-5.0/debian/patches; \
-        echo qemu-5.0-vitastor.patch >> /root/packages/qemu-$REL/qemu-5.0/debian/patches/series; \
-    else \
-        cp /root/vitastor/patches/qemu-5.1-vitastor.patch /root/packages/qemu-$REL/qemu-*/debian/patches; \
-        P=`ls -d /root/packages/qemu-$REL/qemu-*/debian/patches`; \
-        echo qemu-5.1-vitastor.patch >> $P/series; \
-    fi; \
-    cd /root/packages/qemu-$REL/qemu-*/; \
-    V=$(head -n1 debian/changelog | perl -pe 's/^.*\((.*?)(~bpo[\d\+]*)?\).*$/$1/')+vitastor1; \
-    DEBFULLNAME="Vitaliy Filippov <vitalif@yourcmc.ru>" dch -D $REL -v $V 'Plug Vitastor block driver'; \
-    DEB_BUILD_OPTIONS=nocheck dpkg-buildpackage --jobs=auto -sa; \
-    rm -rf /root/packages/qemu-$REL/qemu-*/

debian/rules

@@ -1,9 +0,0 @@
-#!/usr/bin/make -f
-export DH_VERBOSE = 1
-
-%:
-	dh $@
-
-override_dh_installdeb:
-	cat debian/substvars >> debian/vitastor.substvars
-	dh_installdeb

debian/source/format

@@ -1 +0,0 @@
-3.0 (quilt)

debian/substvars

@@ -1,2 +0,0 @@
-dep:fio=3.16-1
-dep:qemu=1:5.1+dfsg-4+vitastor1

debian/vitastor.Dockerfile

@@ -1,67 +0,0 @@
-# Build Vitastor packages for Debian Buster or Bullseye/Sid inside a container
-# cd ..; podman build --build-arg REL=bullseye -v `pwd`/packages:/root/packages -f debian/vitastor.Dockerfile .
-
-FROM debian:$REL
-
-WORKDIR /root
-
-RUN if [ "$REL" = "buster" ]; then \
-        echo 'deb http://deb.debian.org/debian buster-backports main' >> /etc/apt/sources.list; \
-        echo >> /etc/apt/preferences; \
-        echo 'Package: *' >> /etc/apt/preferences; \
-        echo 'Pin: release a=buster-backports' >> /etc/apt/preferences; \
-        echo 'Pin-Priority: 500' >> /etc/apt/preferences; \
-    fi; \
-    grep '^deb ' /etc/apt/sources.list | perl -pe 's/^deb/deb-src/' >> /etc/apt/sources.list; \
-    echo 'APT::Install-Recommends false;' >> /etc/apt/apt.conf; \
-    echo 'APT::Install-Suggests false;' >> /etc/apt/apt.conf
-
-RUN apt-get update
-RUN apt-get -y install qemu fio liburing1 liburing-dev libgoogle-perftools-dev devscripts
-RUN apt-get -y build-dep qemu
-RUN apt-get -y build-dep fio
-RUN apt-get --download-only source qemu
-RUN apt-get --download-only source fio
-RUN apt-get update && apt-get -y install libjerasure-dev cmake libibverbs-dev
-
-ADD . /root/vitastor
-RUN set -e -x; \
-    mkdir -p /root/fio-build/; \
-    cd /root/fio-build/; \
-    rm -rf /root/fio-build/*; \
-    dpkg-source -x /root/fio*.dsc; \
-    cd /root/packages/qemu-$REL/; \
-    rm -rf qemu*/; \
-    dpkg-source -x qemu*.dsc; \
-    cd /root/packages/qemu-$REL/qemu*/; \
-    debian/rules b/configure-stamp; \
-    cd b/qemu; \
-    make -j8 qapi/qapi-builtin-types.h; \
-    mkdir -p /root/packages/vitastor-$REL; \
-    rm -rf /root/packages/vitastor-$REL/*; \
-    cd /root/packages/vitastor-$REL; \
-    cp -r /root/vitastor vitastor-0.6.5; \
-    ln -s /root/packages/qemu-$REL/qemu-*/ vitastor-0.6.5/qemu; \
-    ln -s /root/fio-build/fio-*/ vitastor-0.6.5/fio; \
-    cd vitastor-0.6.5; \
-    FIO=$(head -n1 fio/debian/changelog | perl -pe 's/^.*\((.*?)\).*$/$1/'); \
-    QEMU=$(head -n1 qemu/debian/changelog | perl -pe 's/^.*\((.*?)\).*$/$1/'); \
-    sh copy-qemu-includes.sh; \
-    sh copy-fio-includes.sh; \
-    rm qemu fio; \
-    mkdir -p a b debian/patches; \
-    mv qemu-copy b/qemu; \
-    mv fio-copy b/fio; \
-    diff -NaurpbB a b > debian/patches/qemu-fio-headers.patch || true; \
-    echo qemu-fio-headers.patch >> debian/patches/series; \
-    rm -rf a b; \
-    rm -rf /root/packages/qemu-$REL/qemu*/; \
-    echo "dep:fio=$FIO" > debian/substvars; \
-    echo "dep:qemu=$QEMU" >> debian/substvars; \
-    cd /root/packages/vitastor-$REL; \
-    tar --sort=name --mtime='2020-01-01' --owner=0 --group=0 --exclude=debian -cJf vitastor_0.6.5.orig.tar.xz vitastor-0.6.5; \
-    cd vitastor-0.6.5; \
-    V=$(head -n1 debian/changelog | perl -pe 's/^.*\((.*?)\).*$/$1/'); \
-    DEBFULLNAME="Vitaliy Filippov <vitalif@yourcmc.ru>" dch -D $REL -v "$V""$REL" "Rebuild for $REL"; \
-    DEB_BUILD_OPTIONS=nocheck dpkg-buildpackage --jobs=auto -sa; \
-    rm -rf /root/packages/vitastor-$REL/vitastor-*/

dump_journal.cpp

@@ -0,0 +1,165 @@
+#define _LARGEFILE64_SOURCE
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdint.h>
+#include <malloc.h>
+#include <linux/fs.h>
+#include <string.h>
+#include <errno.h>
+#include <assert.h>
+#include <stdio.h>
+
+#include "blockstore_impl.h"
+#include "crc32c.h"
+
+struct journal_dump_t
+{
+    char *journal_device;
+    uint32_t journal_block;
+    uint64_t journal_offset;
+    uint64_t journal_len;
+    uint64_t journal_pos;
+    int fd;
+
+    void dump_block(void *buf);
+};
+
+int main(int argc, char *argv[])
+{
+    if (argc < 5)
+    {
+        printf("USAGE: %s <journal_file> <journal_block_size> <offset> <size>\n", argv[0]);
+        return 1;
+    }
+    journal_dump_t self;
+    self.journal_device = argv[1];
+    self.journal_block = strtoul(argv[2], NULL, 10);
+    self.journal_offset = strtoull(argv[3], NULL, 10);
+    self.journal_len = strtoull(argv[4], NULL, 10);
+    if (self.journal_block < MEM_ALIGNMENT || (self.journal_block % MEM_ALIGNMENT) ||
+        self.journal_block > 128*1024)
+    {
+        printf("Invalid journal block size\n");
+        return 1;
+    }
+    self.fd = open(self.journal_device, O_DIRECT|O_RDONLY);
+    if (self.fd == -1)
+    {
+        printf("Failed to open journal\n");
+        return 1;
+    }
+    void *data = memalign(MEM_ALIGNMENT, self.journal_block);
+    self.journal_pos = 0;
+    while (self.journal_pos < self.journal_len)
+    {
+        int r = pread(self.fd, data, self.journal_block, self.journal_offset+self.journal_pos);
+        assert(r == self.journal_block);
+        uint64_t s;
+        for (s = 0; s < self.journal_block; s += 8)
+        {
+            if (*((uint64_t*)(data+s)) != 0)
+                break;
+        }
+        if (s == self.journal_block)
+        {
+            printf("offset %08lx: zeroes\n", self.journal_pos);
+            self.journal_pos += self.journal_block;
+        }
+        else if (((journal_entry*)data)->magic == JOURNAL_MAGIC)
+        {
+            printf("offset %08lx:\n", self.journal_pos);
+            self.dump_block(data);
+        }
+        else
+        {
+            printf("offset %08lx: no magic in the beginning, looks like random data (pattern=%lx)\n", self.journal_pos, *((uint64_t*)data));
+            self.journal_pos += self.journal_block;
+        }
+    }
+    free(data);
+    close(self.fd);
+    return 0;
+}
+
+void journal_dump_t::dump_block(void *buf)
+{
+    uint32_t pos = 0;
+    journal_pos += journal_block;
+    int entry = 0;
+    bool wrapped = false;
+    while (pos < journal_block)
+    {
+        journal_entry *je = (journal_entry*)(buf + pos);
+        if (je->magic != JOURNAL_MAGIC || je->type < JE_START || je->type > JE_DELETE)
+        {
+            break;
+        }
+        const char *crc32_valid = je_crc32(je) == je->crc32 ? "(valid)" : "(invalid)";
+        printf("entry % 3d: crc32=%08x %s prev=%08x ", entry, je->crc32, crc32_valid, je->crc32_prev);
+        if (je->type == JE_START)
+        {
+            printf("je_start start=%08lx\n", je->start.journal_start);
+        }
+        else if (je->type == JE_SMALL_WRITE)
+        {
+            printf(
+                "je_small_write oid=%lu:%lu ver=%lu offset=%u len=%u loc=%08lx",
+                je->small_write.oid.inode, je->small_write.oid.stripe,
+                je->small_write.version, je->small_write.offset, je->small_write.len,
+                je->small_write.data_offset
+            );
+            if (journal_pos + je->small_write.len > journal_len)
+            {
+                // data continues from the beginning of the journal
+                journal_pos = journal_block;
+                wrapped = true;
+            }
+            if (journal_pos != je->small_write.data_offset)
+            {
+                printf(" (mismatched, calculated = %lu)", journal_pos);
+            }
+            journal_pos += je->small_write.len;
+            if (journal_pos >= journal_len)
+            {
+                journal_pos = journal_block;
+                wrapped = true;
+            }
+            uint32_t data_crc32 = 0;
+            void *data = memalign(MEM_ALIGNMENT, je->small_write.len);
+            assert(pread(fd, data, je->small_write.len, journal_offset+je->small_write.data_offset) == je->small_write.len);
+            data_crc32 = crc32c(0, data, je->small_write.len);
+            free(data);
+            printf(
+                " data_crc32=%08x%s", je->small_write.crc32_data,
+                (data_crc32 != je->small_write.crc32_data) ? " (invalid)" : " (valid)"
+            );
+            printf("\n");
+        }
+        else if (je->type == JE_BIG_WRITE)
+        {
+            printf("je_big_write oid=%lu:%lu ver=%lu loc=%08lx\n", je->big_write.oid.inode, je->big_write.oid.stripe, je->big_write.version, je->big_write.location);
+        }
+        else if (je->type == JE_STABLE)
+        {
+            printf("je_stable oid=%lu:%lu ver=%lu\n", je->stable.oid.inode, je->stable.oid.stripe, je->stable.version);
+        }
+        else if (je->type == JE_ROLLBACK)
+        {
+            printf("je_rollback oid=%lu:%lu ver=%lu\n", je->rollback.oid.inode, je->rollback.oid.stripe, je->rollback.version);
+        }
+        else if (je->type == JE_DELETE)
+        {
+            printf("je_delete oid=%lu:%lu ver=%lu\n", je->del.oid.inode, je->del.oid.stripe, je->del.version);
+        }
+        pos += je->size;
+        entry++;
+    }
+    if (wrapped)
+    {
+        journal_pos = journal_len;
+    }
+}

epoll_manager.cpp

@@ -1,10 +1,6 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
-
 #include <sys/epoll.h>
 #include <sys/poll.h>
 #include <unistd.h>
-#include <stdexcept>
 
 #include "epoll_manager.h"
 
@@ -20,7 +16,7 @@ epoll_manager_t::epoll_manager_t(ring_loop_t *ringloop)
         throw std::runtime_error(std::string("epoll_create: ") + strerror(errno));
     }
 
-    tfd = new timerfd_manager_t([this](int fd, bool wr, std::function<void(int, int)> handler) { set_fd_handler(fd, wr, handler); });
+    tfd = new timerfd_manager_t([this](int fd, std::function<void(int, int)> handler) { set_fd_handler(fd, handler); });
 
     handle_epoll_events();
 }
@@ -35,14 +31,14 @@ epoll_manager_t::~epoll_manager_t()
     close(epoll_fd);
 }
 
-void epoll_manager_t::set_fd_handler(int fd, bool wr, std::function<void(int, int)> handler)
+void epoll_manager_t::set_fd_handler(int fd, std::function<void(int, int)> handler)
 {
     if (handler != NULL)
     {
         bool exists = epoll_handlers.find(fd) != epoll_handlers.end();
         epoll_event ev;
         ev.data.fd = fd;
-        ev.events = (wr ? EPOLLOUT : 0) | EPOLLIN | EPOLLRDHUP | EPOLLET;
+        ev.events = EPOLLOUT | EPOLLIN | EPOLLRDHUP | EPOLLET;
         if (epoll_ctl(epoll_fd, exists ? EPOLL_CTL_MOD : EPOLL_CTL_ADD, fd, &ev) < 0)
         {
             throw std::runtime_error(std::string("epoll_ctl: ") + strerror(errno));
@@ -84,12 +80,8 @@ void epoll_manager_t::handle_epoll_events()
         nfds = epoll_wait(epoll_fd, events, MAX_EPOLL_EVENTS, 0);
         for (int i = 0; i < nfds; i++)
         {
-            auto cb_it = epoll_handlers.find(events[i].data.fd);
-            if (cb_it != epoll_handlers.end())
-            {
-                auto & cb = cb_it->second;
-                cb(events[i].data.fd, events[i].events);
-            }
+            auto & cb = epoll_handlers[events[i].data.fd];
+            cb(events[i].data.fd, events[i].events);
         }
     } while (nfds == MAX_EPOLL_EVENTS);
 }

epoll_manager.h

@@ -1,6 +1,3 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
-
 #pragma once
 
 #include <map>
@@ -16,7 +13,7 @@ class epoll_manager_t
 public:
     epoll_manager_t(ring_loop_t *ringloop);
     ~epoll_manager_t();
-    void set_fd_handler(int fd, bool wr, std::function<void(int, int)> handler);
+    void set_fd_handler(int fd, std::function<void(int, int)> handler);
     void handle_epoll_events();
 
     timerfd_manager_t *tfd;

etcd_state_client.cpp

@@ -0,0 +1,424 @@
+#include "osd_ops.h"
+#include "pg_states.h"
+#include "etcd_state_client.h"
+#include "http_client.h"
+#include "base64.h"
+
+json_kv_t etcd_state_client_t::parse_etcd_kv(const json11::Json & kv_json)
+{
+    json_kv_t kv;
+    kv.key = base64_decode(kv_json["key"].string_value());
+    std::string json_err, json_text = base64_decode(kv_json["value"].string_value());
+    kv.value = json_text == "" ? json11::Json() : json11::Json::parse(json_text, json_err);
+    if (json_err != "")
+    {
+        printf("Bad JSON in etcd key %s: %s (value: %s)\n", kv.key.c_str(), json_err.c_str(), json_text.c_str());
+        kv.key = "";
+    }
+    return kv;
+}
+
+void etcd_state_client_t::etcd_txn(json11::Json txn, int timeout, std::function<void(std::string, json11::Json)> callback)
+{
+    etcd_call("/kv/txn", txn, timeout, callback);
+}
+
+void etcd_state_client_t::etcd_call(std::string api, json11::Json payload, int timeout, std::function<void(std::string, json11::Json)> callback)
+{
+    std::string etcd_address = etcd_addresses[rand() % etcd_addresses.size()];
+    std::string etcd_api_path;
+    int pos = etcd_address.find('/');
+    if (pos >= 0)
+    {
+        etcd_api_path = etcd_address.substr(pos);
+        etcd_address = etcd_address.substr(0, pos);
+    }
+    std::string req = payload.dump();
+    req = "POST "+etcd_api_path+api+" HTTP/1.1\r\n"
+        "Host: "+etcd_address+"\r\n"
+        "Content-Type: application/json\r\n"
+        "Content-Length: "+std::to_string(req.size())+"\r\n"
+        "Connection: close\r\n"
+        "\r\n"+req;
+    http_request_json(tfd, etcd_address, req, timeout, callback);
+}
+
+void etcd_state_client_t::parse_config(json11::Json & config)
+{
+    this->etcd_addresses.clear();
+    if (config["etcd_address"].is_string())
+    {
+        std::string ea = config["etcd_address"].string_value();
+        while (1)
+        {
+            int pos = ea.find(',');
+            std::string addr = pos >= 0 ? ea.substr(0, pos) : ea;
+            if (addr.length() > 0)
+            {
+                if (addr.find('/') < 0)
+                    addr += "/v3";
+                this->etcd_addresses.push_back(addr);
+            }
+            if (pos >= 0)
+                ea = ea.substr(pos+1);
+            else
+                break;
+        }
+    }
+    else if (config["etcd_address"].array_items().size())
+    {
+        for (auto & ea: config["etcd_address"].array_items())
+        {
+            std::string addr = ea.string_value();
+            if (addr != "")
+            {
+                if (addr.find('/') < 0)
+                    addr += "/v3";
+                this->etcd_addresses.push_back(addr);
+            }
+        }
+    }
+    this->etcd_prefix = config["etcd_prefix"].string_value();
+    if (this->etcd_prefix == "")
+    {
+        this->etcd_prefix = "/microceph";
+    }
+    else if (this->etcd_prefix[0] != '/')
+    {
+        this->etcd_prefix = "/"+this->etcd_prefix;
+    }
+    this->log_level = config["log_level"].int64_value();
+}
+
+void etcd_state_client_t::start_etcd_watcher()
+{
+    std::string etcd_address = etcd_addresses[rand() % etcd_addresses.size()];
+    std::string etcd_api_path;
+    int pos = etcd_address.find('/');
+    if (pos >= 0)
+    {
+        etcd_api_path = etcd_address.substr(pos);
+        etcd_address = etcd_address.substr(0, pos);
+    }
+    etcd_watches_initialised = 0;
+    etcd_watch_ws = open_websocket(tfd, etcd_address, etcd_api_path+"/watch", ETCD_SLOW_TIMEOUT, [this](const http_response_t *msg)
+    {
+        if (msg->body.length())
+        {
+            std::string json_err;
+            json11::Json data = json11::Json::parse(msg->body, json_err);
+            if (json_err != "")
+            {
+                printf("Bad JSON in etcd event: %s, ignoring event\n", json_err.c_str());
+            }
+            else
+            {
+                if (data["result"]["created"].bool_value())
+                {
+                    etcd_watches_initialised++;
+                }
+                if (etcd_watches_initialised == 4)
+                {
+                    etcd_watch_revision = data["result"]["header"]["revision"].uint64_value();
+                }
+                // First gather all changes into a hash to remove multiple overwrites
+                json11::Json::object changes;
+                for (auto & ev: data["result"]["events"].array_items())
+                {
+                    auto kv = parse_etcd_kv(ev["kv"]);
+                    if (kv.key != "")
+                    {
+                        changes[kv.key] = kv.value;
+                    }
+                }
+                for (auto & kv: changes)
+                {
+                    if (this->log_level > 0)
+                    {
+                        printf("Incoming event: %s -> %s\n", kv.first.c_str(), kv.second.dump().c_str());
+                    }
+                    parse_state(kv.first, kv.second);
+                }
+                // React to changes
+                if (on_change_hook != NULL)
+                {
+                    on_change_hook(changes);
+                }
+            }
+        }
+        if (msg->eof)
+        {
+            etcd_watch_ws = NULL;
+            if (etcd_watches_initialised == 0)
+            {
+                // Connection not established, retry in <ETCD_SLOW_TIMEOUT>
+                tfd->set_timer(ETCD_SLOW_TIMEOUT, false, [this](int)
+                {
+                    start_etcd_watcher();
+                });
+            }
+            else
+            {
+                // Connection was live, retry immediately
+                start_etcd_watcher();
+            }
+        }
+    });
+    etcd_watch_ws->post_message(WS_TEXT, json11::Json(json11::Json::object {
+        { "create_request", json11::Json::object {
+            { "key", base64_encode(etcd_prefix+"/config/") },
+            { "range_end", base64_encode(etcd_prefix+"/config0") },
+            { "start_revision", etcd_watch_revision+1 },
+            { "watch_id", ETCD_CONFIG_WATCH_ID },
+        } }
+    }).dump());
+    etcd_watch_ws->post_message(WS_TEXT, json11::Json(json11::Json::object {
+        { "create_request", json11::Json::object {
+            { "key", base64_encode(etcd_prefix+"/osd/state/") },
+            { "range_end", base64_encode(etcd_prefix+"/osd/state0") },
+            { "start_revision", etcd_watch_revision+1 },
+            { "watch_id", ETCD_OSD_STATE_WATCH_ID },
+        } }
+    }).dump());
+    etcd_watch_ws->post_message(WS_TEXT, json11::Json(json11::Json::object {
+        { "create_request", json11::Json::object {
+            { "key", base64_encode(etcd_prefix+"/pg/state/") },
+            { "range_end", base64_encode(etcd_prefix+"/pg/state0") },
+            { "start_revision", etcd_watch_revision+1 },
+            { "watch_id", ETCD_PG_STATE_WATCH_ID },
+        } }
+    }).dump());
+    etcd_watch_ws->post_message(WS_TEXT, json11::Json(json11::Json::object {
+        { "create_request", json11::Json::object {
+            { "key", base64_encode(etcd_prefix+"/pg/history/") },
+            { "range_end", base64_encode(etcd_prefix+"/pg/history0") },
+            { "start_revision", etcd_watch_revision+1 },
+            { "watch_id", ETCD_PG_HISTORY_WATCH_ID },
+        } }
+    }).dump());
+}
+
+void etcd_state_client_t::load_global_config()
+{
+    etcd_call("/kv/range", json11::Json::object {
+        { "key", base64_encode(etcd_prefix+"/config/global") }
+    }, ETCD_SLOW_TIMEOUT, [this](std::string err, json11::Json data)
+    {
+        if (err != "")
+        {
+            printf("Error reading OSD configuration from etcd: %s\n", err.c_str());
+            tfd->set_timer(ETCD_SLOW_TIMEOUT, false, [this](int timer_id)
+            {
+                load_global_config();
+            });
+            return;
+        }
+        if (!etcd_watch_revision)
+        {
+            etcd_watch_revision = data["header"]["revision"].uint64_value();
+        }
+        json11::Json::object global_config;
+        if (data["kvs"].array_items().size() > 0)
+        {
+            auto kv = parse_etcd_kv(data["kvs"][0]);
+            if (kv.value.is_object())
+            {
+                global_config = kv.value.object_items();
+            }
+        }
+        on_load_config_hook(global_config);
+    });
+}
+
+void etcd_state_client_t::load_pgs()
+{
+    json11::Json::array txn = {
+        json11::Json::object {
+            { "request_range", json11::Json::object {
+                { "key", base64_encode(etcd_prefix+"/config/pgs") },
+            } }
+        },
+        json11::Json::object {
+            { "request_range", json11::Json::object {
+                { "key", base64_encode(etcd_prefix+"/pg/history/") },
+                { "range_end", base64_encode(etcd_prefix+"/pg/history0") },
+            } }
+        },
+        json11::Json::object {
+            { "request_range", json11::Json::object {
+                { "key", base64_encode(etcd_prefix+"/pg/state/") },
+                { "range_end", base64_encode(etcd_prefix+"/pg/state0") },
+            } }
+        },
+        json11::Json::object {
+            { "request_range", json11::Json::object {
+                { "key", base64_encode(etcd_prefix+"/osd/state/") },
+                { "range_end", base64_encode(etcd_prefix+"/osd/state0") },
+            } }
+        },
+    };
+    json11::Json::object req = { { "success", txn } };
+    json11::Json checks = load_pgs_checks_hook != NULL ? load_pgs_checks_hook() : json11::Json();
+    if (checks.array_items().size() > 0)
+    {
+        req["compare"] = checks;
+    }
+    etcd_txn(req, ETCD_SLOW_TIMEOUT, [this](std::string err, json11::Json data)
+    {
+        if (err != "")
+        {
+            printf("Error loading PGs from etcd: %s\n", err.c_str());
+            tfd->set_timer(ETCD_SLOW_TIMEOUT, false, [this](int timer_id)
+            {
+                load_pgs();
+            });
+            return;
+        }
+        if (!data["succeeded"].bool_value())
+        {
+            on_load_pgs_hook(false);
+            return;
+        }
+        for (auto & res: data["responses"].array_items())
+        {
+            for (auto & kv_json: res["response_range"]["kvs"].array_items())
+            {
+                auto kv = parse_etcd_kv(kv_json);
+                parse_state(kv.key, kv.value);
+            }
+        }
+        on_load_pgs_hook(true);
+    });
+}
+
+void etcd_state_client_t::parse_state(const std::string & key, const json11::Json & value)
+{
+    if (key == etcd_prefix+"/config/pgs")
+    {
+        for (auto & pg_item: this->pg_config)
+        {
+            pg_item.second.exists = false;
+        }
+        for (auto & pg_item: value["items"].object_items())
+        {
+            pg_num_t pg_num = stoull_full(pg_item.first);
+            if (!pg_num)
+            {
+                printf("Bad key in PG configuration: %s (must be a number), skipped\n", pg_item.first.c_str());
+                continue;
+            }
+            this->pg_config[pg_num].exists = true;
+            this->pg_config[pg_num].pause = pg_item.second["pause"].bool_value();
+            this->pg_config[pg_num].primary = pg_item.second["primary"].uint64_value();
+            this->pg_config[pg_num].target_set.clear();
+            for (auto pg_osd: pg_item.second["osd_set"].array_items())
+            {
+                this->pg_config[pg_num].target_set.push_back(pg_osd.uint64_value());
+            }
+            if (this->pg_config[pg_num].target_set.size() != 3)
+            {
+                printf("Bad PG %u config format: incorrect osd_set = %s\n", pg_num, pg_item.second["osd_set"].dump().c_str());
+                this->pg_config[pg_num].target_set.resize(3);
+                this->pg_config[pg_num].pause = true;
+            }
+        }
+    }
+    else if (key.substr(0, etcd_prefix.length()+12) == etcd_prefix+"/pg/history/")
+    {
+        // <etcd_prefix>/pg/history/%d
+        pg_num_t pg_num = stoull_full(key.substr(etcd_prefix.length()+12));
+        if (!pg_num)
+        {
+            printf("Bad etcd key %s, ignoring\n", key.c_str());
+        }
+        else
+        {
+            auto & pg_cfg = this->pg_config[pg_num];
+            pg_cfg.target_history.clear();
+            pg_cfg.all_peers.clear();
+            // Refuse to start PG if any set of the <osd_sets> has no live OSDs
+            for (auto hist_item: value["osd_sets"].array_items())
+            {
+                std::vector<osd_num_t> history_set;
+                for (auto pg_osd: hist_item.array_items())
+                {
+                    history_set.push_back(pg_osd.uint64_value());
+                }
+                pg_cfg.target_history.push_back(history_set);
+            }
+            // Include these additional OSDs when peering the PG
+            for (auto pg_osd: value["all_peers"].array_items())
+            {
+                pg_cfg.all_peers.push_back(pg_osd.uint64_value());
+            }
+        }
+    }
+    else if (key.substr(0, etcd_prefix.length()+10) == etcd_prefix+"/pg/state/")
+    {
+        // <etcd_prefix>/pg/state/%d
+        pg_num_t pg_num = stoull_full(key.substr(etcd_prefix.length()+10));
+        if (!pg_num)
+        {
+            printf("Bad etcd key %s, ignoring\n", key.c_str());
+        }
+        else if (value.is_null())
+        {
+            this->pg_config[pg_num].cur_primary = 0;
+            this->pg_config[pg_num].cur_state = 0;
+        }
+        else
+        {
+            osd_num_t cur_primary = value["primary"].uint64_value();
+            int state = 0;
+            for (auto & e: value["state"].array_items())
+            {
+                int i;
+                for (i = 0; i < pg_state_bit_count; i++)
+                {
+                    if (e.string_value() == pg_state_names[i])
+                    {
+                        state = state | pg_state_bits[i];
+                        break;
+                    }
+                }
+                if (i >= pg_state_bit_count)
+                {
+                    printf("Unexpected PG %u state keyword in etcd: %s\n", pg_num, e.dump().c_str());
+                    return;
+                }
+            }
+            if (!cur_primary || !value["state"].is_array() || !state ||
+                (state & PG_OFFLINE) && state != PG_OFFLINE ||
+                (state & PG_PEERING) && state != PG_PEERING ||
+                (state & PG_INCOMPLETE) && state != PG_INCOMPLETE)
+            {
+                printf("Unexpected PG %u state in etcd: primary=%lu, state=%s\n", pg_num, cur_primary, value["state"].dump().c_str());
+                return;
+            }
+            this->pg_config[pg_num].cur_primary = cur_primary;
+            this->pg_config[pg_num].cur_state = state;
+        }
+    }
+    else if (key.substr(0, etcd_prefix.length()+11) == etcd_prefix+"/osd/state/")
+    {
+        // <etcd_prefix>/osd/state/%d
+        osd_num_t peer_osd = std::stoull(key.substr(etcd_prefix.length()+11));
+        if (peer_osd > 0)
+        {
+            if (value.is_object() && value["state"] == "up" &&
+                value["addresses"].is_array() &&
+                value["port"].int64_value() > 0 && value["port"].int64_value() < 65536)
+            {
+                this->peer_states[peer_osd] = value;
+            }
+            else
+            {
+                this->peer_states.erase(peer_osd);
+            }
+            if (on_change_osd_state_hook != NULL)
+            {
+                on_change_osd_state_hook(peer_osd);
+            }
+        }
+    }
+}

etcd_state_client.h

@@ -0,0 +1,61 @@
+#pragma once
+
+#include "osd_id.h"
+#include "http_client.h"
+#include "timerfd_manager.h"
+
+#define ETCD_CONFIG_WATCH_ID 1
+#define ETCD_PG_STATE_WATCH_ID 2
+#define ETCD_PG_HISTORY_WATCH_ID 3
+#define ETCD_OSD_STATE_WATCH_ID 4
+
+#define MAX_ETCD_ATTEMPTS 5
+#define ETCD_SLOW_TIMEOUT 5000
+#define ETCD_QUICK_TIMEOUT 1000
+
+struct pg_config_t
+{
+    bool exists;
+    osd_num_t primary;
+    std::vector<osd_num_t> target_set;
+    std::vector<std::vector<osd_num_t>> target_history;
+    std::vector<osd_num_t> all_peers;
+    bool pause;
+    osd_num_t cur_primary;
+    int cur_state;
+};
+
+struct json_kv_t
+{
+    std::string key;
+    json11::Json value;
+};
+
+struct etcd_state_client_t
+{
+    std::vector<std::string> etcd_addresses;
+    std::string etcd_prefix;
+    int log_level = 0;
+    timerfd_manager_t *tfd = NULL;
+
+    int etcd_watches_initialised = 0;
+    uint64_t etcd_watch_revision = 0;
+    websocket_t *etcd_watch_ws = NULL;
+    std::map<pg_num_t, pg_config_t> pg_config;
+    std::map<osd_num_t, json11::Json> peer_states;
+
+    std::function<void(json11::Json::object &)> on_change_hook;
+    std::function<void(json11::Json::object &)> on_load_config_hook;
+    std::function<json11::Json()> load_pgs_checks_hook;
+    std::function<void(bool)> on_load_pgs_hook;
+    std::function<void(uint64_t)> on_change_osd_state_hook;
+
+    json_kv_t parse_etcd_kv(const json11::Json & kv_json);
+    void etcd_call(std::string api, json11::Json payload, int timeout, std::function<void(std::string, json11::Json)> callback);
+    void etcd_txn(json11::Json txn, int timeout, std::function<void(std::string, json11::Json)> callback);
+    void start_etcd_watcher();
+    void load_global_config();
+    void load_pgs();
+    void parse_state(const std::string & key, const json11::Json & value);
+    void parse_config(json11::Json & config);
+};

fio_cluster.cpp

@@ -0,0 +1,298 @@
+// FIO engine to test cluster I/O
+//
+// Random write:
+//
+// fio -thread -ioengine=./libfio_cluster.so -name=test -bs=4k -direct=1 -fsync=16 -iodepth=16 -rw=randwrite \
+//     -etcd=127.0.0.1:2379 [-etcd_prefix=/microceph] -size=1000M
+//
+// Linear write:
+//
+// fio -thread -ioengine=./libfio_cluster.so -name=test -bs=128k -direct=1 -fsync=32 -iodepth=32 -rw=write \
+//     -etcd=127.0.0.1:2379 [-etcd_prefix=/microceph] -size=1000M
+//
+// Random read (run with -iodepth=32 or -iodepth=1):
+//
+// fio -thread -ioengine=./libfio_cluster.so -name=test -bs=4k -direct=1 -iodepth=32 -rw=randread \
+//     -etcd=127.0.0.1:2379 [-etcd_prefix=/microceph] -size=1000M
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+
+#include <vector>
+#include <unordered_map>
+
+#include "epoll_manager.h"
+#include "cluster_client.h"
+extern "C" {
+#define CONFIG_HAVE_GETTID
+#define CONFIG_PWRITEV2
+#include "fio/fio.h"
+#include "fio/optgroup.h"
+}
+
+struct sec_data
+{
+    ring_loop_t *ringloop = NULL;
+    epoll_manager_t *epmgr = NULL;
+    cluster_client_t *cli = NULL;
+    bool last_sync = false;
+    /* The list of completed io_u structs. */
+    std::vector<io_u*> completed;
+    uint64_t op_n = 0, inflight = 0;
+    bool trace = false;
+};
+
+struct sec_options
+{
+    int __pad;
+    char *etcd_host = NULL;
+    char *etcd_prefix = NULL;
+    int inode = 0;
+    int trace = 0;
+};
+
+static struct fio_option options[] = {
+    {
+        .name   = "etcd",
+        .lname  = "etcd address",
+        .type   = FIO_OPT_STR_STORE,
+        .off1   = offsetof(struct sec_options, etcd_host),
+        .help   = "etcd address in the form HOST:PORT[/PATH]",
+        .category = FIO_OPT_C_ENGINE,
+        .group  = FIO_OPT_G_FILENAME,
+    },
+    {
+        .name   = "etcd",
+        .lname  = "etcd key prefix",
+        .type   = FIO_OPT_STR_STORE,
+        .off1   = offsetof(struct sec_options, etcd_prefix),
+        .help   = "etcd key prefix, by default /microceph",
+        .category = FIO_OPT_C_ENGINE,
+        .group  = FIO_OPT_G_FILENAME,
+    },
+    {
+        .name   = "inode",
+        .lname  = "inode to run tests on",
+        .type   = FIO_OPT_INT,
+        .off1   = offsetof(struct sec_options, inode),
+        .help   = "inode to run tests on (1 by default)",
+        .category = FIO_OPT_C_ENGINE,
+        .group  = FIO_OPT_G_FILENAME,
+    },
+    {
+        .name   = "osd_trace",
+        .lname  = "OSD trace",
+        .type   = FIO_OPT_BOOL,
+        .off1   = offsetof(struct sec_options, trace),
+        .help   = "Trace OSD operations",
+        .def    = "0",
+        .category = FIO_OPT_C_ENGINE,
+        .group  = FIO_OPT_G_FILENAME,
+    },
+    {
+        .name = NULL,
+    },
+};
+
+static int sec_setup(struct thread_data *td)
+{
+    sec_data *bsd;
+
+    bsd = new sec_data;
+    if (!bsd)
+    {
+        td_verror(td, errno, "calloc");
+        return 1;
+    }
+    td->io_ops_data = bsd;
+
+    if (!td->files_index)
+    {
+        add_file(td, "osd_cluster", 0, 0);
+        td->o.nr_files = td->o.nr_files ? : 1;
+        td->o.open_files++;
+    }
+
+    return 0;
+}
+
+static void sec_cleanup(struct thread_data *td)
+{
+    sec_data *bsd = (sec_data*)td->io_ops_data;
+    if (bsd)
+    {
+        delete bsd->cli;
+        delete bsd->epmgr;
+        delete bsd->ringloop;
+        bsd->cli = NULL;
+        bsd->epmgr = NULL;
+        bsd->ringloop = NULL;
+    }
+}
+
+/* Connect to the server from each thread. */
+static int sec_init(struct thread_data *td)
+{
+    sec_options *o = (sec_options*)td->eo;
+    sec_data *bsd = (sec_data*)td->io_ops_data;
+
+    json11::Json cfg = json11::Json::object {
+        { "etcd_address", std::string(o->etcd_host) },
+        { "etcd_prefix", std::string(o->etcd_prefix ? o->etcd_prefix : "/microceph") },
+    };
+
+    bsd->ringloop = new ring_loop_t(512);
+    bsd->epmgr = new epoll_manager_t(bsd->ringloop);
+    bsd->cli = new cluster_client_t(bsd->ringloop, bsd->epmgr->tfd, cfg);
+
+    bsd->trace = o->trace ? true : false;
+
+    return 0;
+}
+
+/* Begin read or write request. */
+static enum fio_q_status sec_queue(struct thread_data *td, struct io_u *io)
+{
+    sec_options *opt = (sec_options*)td->eo;
+    sec_data *bsd = (sec_data*)td->io_ops_data;
+    int n = bsd->op_n;
+
+    fio_ro_check(td, io);
+    if (io->ddir == DDIR_SYNC && bsd->last_sync)
+    {
+        return FIO_Q_COMPLETED;
+    }
+
+    io->engine_data = bsd;
+    cluster_op_t *op = new cluster_op_t;
+
+    switch (io->ddir)
+    {
+    case DDIR_READ:
+        op->opcode = OSD_OP_READ;
+        op->inode = opt->inode;
+        op->offset = io->offset;
+        op->len = io->xfer_buflen;
+        op->buf = io->xfer_buf;
+        bsd->last_sync = false;
+        break;
+    case DDIR_WRITE:
+        op->opcode = OSD_OP_WRITE;
+        op->inode = opt->inode;
+        op->offset = io->offset;
+        op->len = io->xfer_buflen;
+        op->buf = io->xfer_buf;
+        bsd->last_sync = false;
+        break;
+    case DDIR_SYNC:
+        op->opcode = OSD_OP_SYNC;
+        bsd->last_sync = true;
+        break;
+    default:
+        io->error = EINVAL;
+        return FIO_Q_COMPLETED;
+    }
+
+    op->callback = [io, n](cluster_op_t *op)
+    {
+        io->error = op->retval < 0 ? -op->retval : 0;
+        sec_data *bsd = (sec_data*)io->engine_data;
+        bsd->inflight--;
+        bsd->completed.push_back(io);
+        if (bsd->trace)
+        {
+            printf("--- %s n=%d retval=%d\n", io->ddir == DDIR_READ ? "READ" :
+                (io->ddir == DDIR_WRITE ? "WRITE" : "SYNC"), n, op->retval);
+        }
+        delete op;
+    };
+
+    if (opt->trace)
+    {
+        printf("+++ %s # %d\n", io->ddir == DDIR_READ ? "READ" :
+            (io->ddir == DDIR_WRITE ? "WRITE" : "SYNC"), n);
+    }
+
+    io->error = 0;
+    bsd->inflight++;
+    bsd->op_n++;
+    bsd->cli->execute(op);
+
+    if (io->error != 0)
+        return FIO_Q_COMPLETED;
+    return FIO_Q_QUEUED;
+}
+
+static int sec_getevents(struct thread_data *td, unsigned int min, unsigned int max, const struct timespec *t)
+{
+    sec_data *bsd = (sec_data*)td->io_ops_data;
+    while (true)
+    {
+        bsd->ringloop->loop();
+        if (bsd->completed.size() >= min)
+            break;
+        bsd->ringloop->wait();
+    }
+    return bsd->completed.size();
+}
+
+static struct io_u *sec_event(struct thread_data *td, int event)
+{
+    sec_data *bsd = (sec_data*)td->io_ops_data;
+    if (bsd->completed.size() == 0)
+        return NULL;
+    /* FIXME We ignore the event number and assume fio calls us exactly once for [0..nr_events-1] */
+    struct io_u *ev = bsd->completed.back();
+    bsd->completed.pop_back();
+    return ev;
+}
+
+static int sec_io_u_init(struct thread_data *td, struct io_u *io)
+{
+    io->engine_data = NULL;
+    return 0;
+}
+
+static void sec_io_u_free(struct thread_data *td, struct io_u *io)
+{
+}
+
+static int sec_open_file(struct thread_data *td, struct fio_file *f)
+{
+    return 0;
+}
+
+static int sec_invalidate(struct thread_data *td, struct fio_file *f)
+{
+    return 0;
+}
+
+struct ioengine_ops ioengine = {
+    .name               = "microceph_cluster",
+    .version            = FIO_IOOPS_VERSION,
+    .flags              = FIO_MEMALIGN | FIO_DISKLESSIO | FIO_NOEXTEND,
+    .setup              = sec_setup,
+    .init               = sec_init,
+    .queue              = sec_queue,
+    .getevents          = sec_getevents,
+    .event              = sec_event,
+    .cleanup            = sec_cleanup,
+    .open_file          = sec_open_file,
+    .invalidate         = sec_invalidate,
+    .io_u_init          = sec_io_u_init,
+    .io_u_free          = sec_io_u_free,
+    .option_struct_size = sizeof(struct sec_options),
+    .options            = options,
+};
+
+static void fio_init fio_sec_register(void)
+{
+    register_ioengine(&ioengine);
+}
+
+static void fio_exit fio_sec_unregister(void)
+{
+    unregister_ioengine(&ioengine);
+}

fio_engine.cpp

@@ -1,6 +1,3 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 (see README.md for details)
-
 // FIO engine to test Blockstore
 //
 // Initialize storage for tests:
@@ -25,15 +22,18 @@
 //     -bs_config='{"data_device":"./test_data.bin"}' -size=1000M
 
 #include "blockstore.h"
-#include "epoll_manager.h"
-#include "fio_headers.h"
+extern "C" {
+#define CONFIG_HAVE_GETTID
+#define CONFIG_PWRITEV2
+#include "fio/fio.h"
+#include "fio/optgroup.h"
+}
 
 #include "json11/json11.hpp"
 
 struct bs_data
 {
     blockstore_t *bs;
-    epoll_manager_t *epmgr;
     ring_loop_t *ringloop;
     /* The list of completed io_u structs. */
     std::vector<io_u*> completed;
@@ -106,7 +106,6 @@ static void bs_cleanup(struct thread_data *td)
         }
     safe:
         delete bsd->bs;
-        delete bsd->epmgr;
         delete bsd->ringloop;
         delete bsd;
     }
@@ -132,8 +131,7 @@ static int bs_init(struct thread_data *td)
         }
     }
     bsd->ringloop = new ring_loop_t(512);
-    bsd->epmgr = new epoll_manager_t(bsd->ringloop);
-    bsd->bs = new blockstore_t(config, bsd->ringloop, bsd->epmgr->tfd);
+    bsd->bs = new blockstore_t(config, bsd->ringloop);
     while (1)
     {
         bsd->ringloop->loop();
@@ -292,7 +290,7 @@ static int bs_invalidate(struct thread_data *td, struct fio_file *f)
 }
 
 struct ioengine_ops ioengine = {
-    .name               = "vitastor_blockstore",
+    .name               = "microceph_blockstore",
     .version            = FIO_IOOPS_VERSION,
     .flags              = FIO_MEMALIGN | FIO_DISKLESSIO | FIO_NOEXTEND,
     .setup              = bs_setup,

fio_sec_osd.cpp

@@ -1,6 +1,3 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
-
 // FIO engine to test Blockstore through Secondary OSD interface
 //
 // Prepare storage like in fio_engine.cpp, then start OSD with ./osd, then test it
@@ -30,7 +27,12 @@
 
 #include "rw_blocking.h"
 #include "osd_ops.h"
-#include "fio_headers.h"
+extern "C" {
+#define CONFIG_HAVE_GETTID
+#define CONFIG_PWRITEV2
+#include "fio/fio.h"
+#include "fio/optgroup.h"
+}
 
 struct sec_data
 {
@@ -140,7 +142,6 @@ static void sec_cleanup(struct thread_data *td)
     if (bsd)
     {
         close(bsd->connect_fd);
-        delete bsd;
     }
 }
 
@@ -204,7 +205,7 @@ static enum fio_q_status sec_queue(struct thread_data *td, struct io_u *io)
     case DDIR_READ:
         if (!opt->single_primary)
         {
-            op.hdr.opcode = OSD_OP_SEC_READ;
+            op.hdr.opcode = OSD_OP_SECONDARY_READ;
             op.sec_rw.oid = {
                 .inode = 1,
                 .stripe = io->offset >> bsd->block_order,
@@ -225,7 +226,7 @@ static enum fio_q_status sec_queue(struct thread_data *td, struct io_u *io)
     case DDIR_WRITE:
         if (!opt->single_primary)
         {
-            op.hdr.opcode = OSD_OP_SEC_WRITE;
+            op.hdr.opcode = OSD_OP_SECONDARY_WRITE;
             op.sec_rw.oid = {
                 .inode = 1,
                 .stripe = io->offset >> bsd->block_order,
@@ -313,7 +314,6 @@ static int sec_getevents(struct thread_data *td, unsigned int min, unsigned int
             exit(1);
         }
         io_u* io = it->second;
-        bsd->queue.erase(it);
         if (io->ddir == DDIR_READ)
         {
             if (reply.hdr.retval != io->xfer_buflen)
@@ -381,7 +381,7 @@ static int sec_invalidate(struct thread_data *td, struct fio_file *f)
 }
 
 struct ioengine_ops ioengine = {
-    .name               = "vitastor_secondary_osd",
+    .name               = "microceph_secondary_osd",
     .version            = FIO_IOOPS_VERSION,
     .flags              = FIO_MEMALIGN | FIO_DISKLESSIO | FIO_NOEXTEND,
     .setup              = sec_setup,

http_client.cpp

@@ -1,6 +1,3 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
-
 #include <netinet/tcp.h>
 #include <sys/epoll.h>
 
@@ -13,8 +10,6 @@
 #include <fcntl.h>
 #include <string.h>
 
-#include <stdexcept>
-
 #include "json11/json11.hpp"
 #include "http_client.h"
 #include "timerfd_manager.h"
@@ -22,6 +17,7 @@
 #define READ_BUFFER_SIZE 9000
 
 static int extract_port(std::string & host);
+static std::string strtolower(const std::string & in);
 static std::string trim(const std::string & in);
 static std::string ws_format_frame(int type, uint64_t size);
 static bool ws_parse_frame(std::string & buf, int & type, std::string & res);
@@ -160,7 +156,7 @@ http_co_t::~http_co_t()
     }
     if (peer_fd >= 0)
     {
-        tfd->set_fd_handler(peer_fd, false, NULL);
+        tfd->set_fd_handler(peer_fd, NULL);
         close(peer_fd);
         peer_fd = -1;
     }
@@ -227,7 +223,7 @@ void http_co_t::start_connection()
         end();
         return;
     }
-    tfd->set_fd_handler(peer_fd, true, [this](int peer_fd, int epoll_events)
+    tfd->set_fd_handler(peer_fd, [this](int peer_fd, int epoll_events)
     {
         this->epoll_events |= epoll_events;
         handle_events();
@@ -280,11 +276,6 @@ void http_co_t::handle_connect_result()
     }
     int one = 1;
     setsockopt(peer_fd, SOL_TCP, TCP_NODELAY, &one, sizeof(one));
-    tfd->set_fd_handler(peer_fd, false, [this](int peer_fd, int epoll_events)
-    {
-        this->epoll_events |= epoll_events;
-        handle_events();
-    });
     state = HTTP_CO_SENDING_REQUEST;
     submit_send();
     stackout();
@@ -306,18 +297,15 @@ void http_co_t::submit_read()
     {
         res = -errno;
     }
-    if (res == -EAGAIN)
+    if (res == -EAGAIN || res == 0)
     {
         epoll_events = epoll_events & ~EPOLLIN;
     }
-    else if (res <= 0)
+    else if (res < 0)
     {
-        // < 0 means error, 0 means EOF
-        if (!res)
-            epoll_events = epoll_events & ~EPOLLIN;
         end();
     }
-    else
+    else if (res > 0)
     {
         response += std::string(rbuf.data(), res);
         handle_read();
@@ -672,7 +660,7 @@ static int extract_port(std::string & host)
     return port;
 }
 
-std::string strtolower(const std::string & in)
+static std::string strtolower(const std::string & in)
 {
     std::string s = in;
     for (int i = 0; i < s.length(); i++)

http_client.h

@@ -1,6 +1,3 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
-
 #pragma once
 #include <string>
 #include <vector>
@@ -49,8 +46,6 @@ std::vector<std::string> getifaddr_list(bool include_v6 = false);
 
 uint64_t stoull_full(const std::string & str, int base = 10);
 
-std::string strtolower(const std::string & in);
-
 void http_request(timerfd_manager_t *tfd, const std::string & host, const std::string & request,
     const http_options_t & options, std::function<void(const http_response_t *response)> callback);
 

json11

@@ -1 +0,0 @@
-Subproject commit 97f06cb20c1e136fd37d58fb40f57dd8f8a3a4a7

lambda_size.cpp

@@ -0,0 +1,48 @@
+#include <iostream>
+#include <functional>
+#include <array>
+#include <cstdlib> // for malloc() and free()
+using namespace std;
+
+// replace operator new and delete to log allocations
+void* operator new(std::size_t n)
+{
+    cout << "Allocating " << n << " bytes" << endl;
+    return malloc(n);
+}
+
+void operator delete(void* p) throw()
+{
+    free(p);
+}
+
+class test
+{
+public:
+    std::string s;
+    void a(std::function<void()> & f, const char *str)
+    {
+        auto l = [this, str]() { cout << str << " ? " << s << " from this\n"; };
+        cout << "Assigning lambda3 of size " << sizeof(l) << endl;
+        f = l;
+    }
+};
+
+int main()
+{
+    std::array<char, 16> arr1;
+    auto lambda1 = [arr1](){};
+    cout << "Assigning lambda1 of size " << sizeof(lambda1) << endl;
+    std::function<void()> f1 = lambda1;
+
+    std::array<char, 17> arr2;
+    auto lambda2 = [arr2](){};
+    cout << "Assigning lambda2 of size " << sizeof(lambda2) << endl;
+    std::function<void()> f2 = lambda2;
+
+    test t;
+    std::function<void()> f3;
+    t.s = "str";
+    t.a(f3, "huyambda");
+    f3();
+}

lp/lp-optimizer.js

@@ -1,6 +1,3 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 (see README.md for details)
-
 // Data distribution optimizer using linear programming (lp_solve)
 
 const child_process = require('child_process');
@@ -28,7 +25,7 @@ async function lp_solve(text)
     let vars = {};
     for (const line of stdout.split(/\n/))
     {
-        let m = /^(^Value of objective function: (-?[\d\.]+)|Actual values of the variables:)\s*$/.exec(line);
+        let m = /^(^Value of objective function: ([\d\.]+)|Actual values of the variables:)\s*$/.exec(line);
         if (m)
         {
             if (m[2])
@@ -50,34 +47,34 @@ async function lp_solve(text)
     return { score, vars };
 }
 
-async function optimize_initial({ osd_tree, pg_count, pg_size = 3, pg_minsize = 2, max_combinations = 10000, parity_space = 1 })
+async function optimize_initial(osd_tree, pg_count, max_combinations)
 {
-    if (!pg_count || !osd_tree)
-    {
-        return null;
-    }
+    max_combinations = max_combinations || 10000;
     const all_weights = Object.assign({}, ...Object.values(osd_tree));
     const total_weight = Object.values(all_weights).reduce((a, c) => Number(a) + Number(c), 0);
-    const all_pgs = Object.values(random_combinations(osd_tree, pg_size, max_combinations, parity_space > 1));
+    let all_pgs = all_combinations(osd_tree, null, true);
+    if (all_pgs.length > max_combinations)
+    {
+        const prob = max_combinations/all_pgs.length;
+        all_pgs = all_pgs.filter(pg => Math.random() < prob);
+    }
     const pg_per_osd = {};
     for (const pg of all_pgs)
     {
-        for (let i = 0; i < pg.length; i++)
+        for (const osd of pg)
         {
-            const osd = pg[i];
             pg_per_osd[osd] = pg_per_osd[osd] || [];
-            pg_per_osd[osd].push((i >= pg_minsize ? parity_space+'*' : '')+"pg_"+pg.join("_"));
+            pg_per_osd[osd].push("pg_"+pg.join("_"));
         }
     }
-    const pg_effsize = Math.min(pg_minsize, Object.keys(osd_tree).length)
-        + Math.max(0, Math.min(pg_size, Object.keys(osd_tree).length) - pg_minsize) * parity_space;
+    const pg_size = Math.min(Object.keys(osd_tree).length, 3);
     let lp = '';
     lp += "max: "+all_pgs.map(pg => 'pg_'+pg.join('_')).join(' + ')+";\n";
     for (const osd in pg_per_osd)
     {
         if (osd !== NO_OSD)
         {
-            let osd_pg_count = all_weights[osd]/total_weight*pg_effsize*pg_count;
+            let osd_pg_count = all_weights[osd]/total_weight*pg_size*pg_count;
             lp += pg_per_osd[osd].join(' + ')+' <= '+osd_pg_count+';\n';
         }
     }
@@ -89,30 +86,11 @@ async function optimize_initial({ osd_tree, pg_count, pg_size = 3, pg_minsize =
     const lp_result = await lp_solve(lp);
     if (!lp_result)
     {
-        console.log(lp);
         throw new Error('Problem is infeasible or unbounded - is it a bug?');
     }
     const int_pgs = make_int_pgs(lp_result.vars, pg_count);
-    const eff = pg_list_space_efficiency(int_pgs, all_weights, pg_minsize, parity_space);
-    const res = {
-        score: lp_result.score,
-        weights: lp_result.vars,
-        int_pgs,
-        space: eff * pg_effsize,
-        total_space: total_weight,
-    };
-    return res;
-}
-
-function shuffle(array)
-{
-    for (let i = array.length - 1, j, x; i > 0; i--)
-    {
-        j = Math.floor(Math.random() * (i + 1));
-        x = array[i];
-        array[i] = array[j];
-        array[j] = x;
-    }
+    const eff = pg_list_space_efficiency(int_pgs, all_weights);
+    return { score: lp_result.score, weights: lp_result.vars, int_pgs, space: eff*pg_size, total_space: total_weight };
 }
 
 function make_int_pgs(weights, pg_count)
@@ -131,122 +109,14 @@ function make_int_pgs(weights, pg_count)
         weight_left -= weights[pg_name];
         pg_left -= n;
     }
-    shuffle(int_pgs);
     return int_pgs;
 }
 
-function calc_intersect_weights(pg_size, pg_count, prev_weights, all_pgs)
-{
-    const move_weights = {};
-    if ((1 << pg_size) < pg_count)
-    {
-        const intersect = {};
-        for (const pg_name in prev_weights)
-        {
-            const pg = pg_name.substr(3).split(/_/);
-            for (let omit = 1; omit < (1 << pg_size); omit++)
-            {
-                let pg_omit = [ ...pg ];
-                let intersect_count = pg_size;
-                for (let i = 0; i < pg_size; i++)
-                {
-                    if (omit & (1 << i))
-                    {
-                        pg_omit[i] = '';
-                        intersect_count--;
-                    }
-                }
-                pg_omit = pg_omit.join(':');
-                intersect[pg_omit] = Math.max(intersect[pg_omit] || 0, intersect_count);
-            }
-        }
-        for (const pg of all_pgs)
-        {
-            let max_int = 0;
-            for (let omit = 1; omit < (1 << pg_size); omit++)
-            {
-                let pg_omit = [ ...pg ];
-                for (let i = 0; i < pg_size; i++)
-                {
-                    if (omit & (1 << i))
-                    {
-                        pg_omit[i] = '';
-                    }
-                }
-                pg_omit = pg_omit.join(':');
-                max_int = Math.max(max_int, intersect[pg_omit] || 0);
-            }
-            move_weights['pg_'+pg.join('_')] = pg_size-max_int;
-        }
-    }
-    else
-    {
-        const prev_pg_hashed = Object.keys(prev_weights).map(pg_name => pg_name.substr(3).split(/_/).reduce((a, c) => { a[c] = 1; return a; }, {}));
-        for (const pg of all_pgs)
-        {
-            if (!prev_weights['pg_'+pg.join('_')])
-            {
-                let max_int = 0;
-                for (const prev_hash in prev_pg_hashed)
-                {
-                    const intersect_count = pg.reduce((a, osd) => a + (prev_hash[osd] ? 1 : 0), 0);
-                    if (max_int < intersect_count)
-                    {
-                        max_int = intersect_count;
-                        if (max_int >= pg_size)
-                        {
-                            break;
-                        }
-                    }
-                }
-                move_weights['pg_'+pg.join('_')] = pg_size-max_int;
-            }
-        }
-    }
-    return move_weights;
-}
-
-function add_valid_previous(osd_tree, prev_weights, all_pgs)
-{
-    // Add previous combinations that are still valid
-    const hosts = Object.keys(osd_tree).sort();
-    const host_per_osd = {};
-    for (const host in osd_tree)
-    {
-        for (const osd in osd_tree[host])
-        {
-            host_per_osd[osd] = host;
-        }
-    }
-    skip_pg: for (const pg_name in prev_weights)
-    {
-        const seen_hosts = {};
-        const pg = pg_name.substr(3).split(/_/);
-        for (const osd of pg)
-        {
-            if (!host_per_osd[osd] || seen_hosts[host_per_osd[osd]])
-            {
-                continue skip_pg;
-            }
-            seen_hosts[host_per_osd[osd]] = true;
-        }
-        if (!all_pgs[pg_name])
-        {
-            all_pgs[pg_name] = pg;
-        }
-    }
-}
-
 // Try to minimize data movement
-async function optimize_change({ prev_pgs: prev_int_pgs, osd_tree, pg_size = 3, pg_minsize = 2, max_combinations = 10000, parity_space = 1 })
+async function optimize_change(prev_int_pgs, osd_tree, max_combinations)
 {
-    if (!osd_tree)
-    {
-        return null;
-    }
-    // FIXME: use parity_chunks with parity_space instead of pg_minsize
-    const pg_effsize = Math.min(pg_minsize, Object.keys(osd_tree).length)
-        + Math.max(0, Math.min(pg_size, Object.keys(osd_tree).length) - pg_minsize) * parity_space;
+    max_combinations = max_combinations || 10000;
+    const pg_size = Math.min(Object.keys(osd_tree).length, 3);
     const pg_count = prev_int_pgs.length;
     const prev_weights = {};
     const prev_pg_per_osd = {};
@@ -254,55 +124,70 @@ async function optimize_change({ prev_pgs: prev_int_pgs, osd_tree, pg_size = 3,
     {
         const pg_name = 'pg_'+pg.join('_');
         prev_weights[pg_name] = (prev_weights[pg_name]||0) + 1;
-        for (let i = 0; i < pg.length; i++)
+        for (const osd of pg)
         {
-            const osd = pg[i];
             prev_pg_per_osd[osd] = prev_pg_per_osd[osd] || [];
-            prev_pg_per_osd[osd].push([ pg_name, (i >= pg_minsize ? parity_space : 1) ]);
+            prev_pg_per_osd[osd].push(pg_name);
         }
     }
     // Get all combinations
-    let all_pgs = random_combinations(osd_tree, pg_size, max_combinations, parity_space > 1);
-    add_valid_previous(osd_tree, prev_weights, all_pgs);
-    all_pgs = Object.values(all_pgs);
+    let all_pgs = all_combinations(osd_tree, null, true);
+    if (all_pgs.length > max_combinations)
+    {
+        const intersecting = all_pgs.filter(pg => prev_weights['pg_'+pg.join('_')]);
+        if (intersecting.length > max_combinations)
+        {
+            const prob = max_combinations/intersecting.length;
+            all_pgs = intersecting.filter(pg => Math.random() < prob);
+        }
+        else
+        {
+            const prob = (max_combinations-intersecting.length)/all_pgs.length;
+            all_pgs = all_pgs.filter(pg => Math.random() < prob || prev_weights['pg_'+pg.join('_')]);
+        }
+    }
     const pg_per_osd = {};
     for (const pg of all_pgs)
     {
         const pg_name = 'pg_'+pg.join('_');
-        for (let i = 0; i < pg.length; i++)
+        for (const osd of pg)
         {
-            const osd = pg[i];
             pg_per_osd[osd] = pg_per_osd[osd] || [];
-            pg_per_osd[osd].push([ pg_name, (i >= pg_minsize ? parity_space : 1) ]);
+            pg_per_osd[osd].push(pg_name);
         }
     }
     // Penalize PGs based on their similarity to old PGs
-    const move_weights = calc_intersect_weights(pg_size, pg_count, prev_weights, all_pgs);
+    const intersect = {};
+    for (const pg_name in prev_weights)
+    {
+        const pg = pg_name.substr(3).split(/_/);
+        intersect[pg[0]+'::'] = intersect[':'+pg[1]+':'] = intersect['::'+pg[2]] = 2;
+        intersect[pg[0]+'::'+pg[2]] = intersect[':'+pg[1]+':'+pg[2]] = intersect[pg[0]+':'+pg[1]+':'] = 1;
+    }
+    const move_weights = {};
+    for (const pg of all_pgs)
+    {
+        move_weights['pg_'+pg.join('_')] =
+            intersect[pg[0]+'::'+pg[2]] || intersect[':'+pg[1]+':'+pg[2]] || intersect[pg[0]+':'+pg[1]+':'] ||
+            intersect[pg[0]+'::'] || intersect[':'+pg[1]+':'] || intersect['::'+pg[2]] ||
+            3;
+    }
     // Calculate total weight - old PG weights
     const all_pg_names = all_pgs.map(pg => 'pg_'+pg.join('_'));
-    const all_pgs_hash = all_pg_names.reduce((a, c) => { a[c] = true; return a; }, {});
     const all_weights = Object.assign({}, ...Object.values(osd_tree));
     const total_weight = Object.values(all_weights).reduce((a, c) => Number(a) + Number(c), 0);
     // Generate the LP problem
     let lp = '';
     lp += 'max: '+all_pg_names.map(pg_name => (
-        prev_weights[pg_name] ? `${pg_size+1}*add_${pg_name} - ${pg_size+1}*del_${pg_name}` : `${pg_size+1-move_weights[pg_name]}*${pg_name}`
+        prev_weights[pg_name] ? `${4-move_weights[pg_name]}*add_${pg_name} - 4*del_${pg_name}` : `${4-move_weights[pg_name]}*${pg_name}`
     )).join(' + ')+';\n';
-    lp += all_pg_names
-        .map(pg_name => (prev_weights[pg_name] ? `add_${pg_name} - del_${pg_name}` : `${pg_name}`))
-        .join(' + ')+' = '+(pg_count
-            - Object.keys(prev_weights).reduce((a, old_pg_name) => (a + (all_pgs_hash[old_pg_name] ? prev_weights[old_pg_name] : 0)), 0)
-        )+';\n';
     for (const osd in pg_per_osd)
     {
         if (osd !== NO_OSD)
         {
-            const osd_sum = (pg_per_osd[osd]||[]).map(([ pg_name, space ]) => (
-                prev_weights[pg_name] ? `${space} * add_${pg_name} - ${space} * del_${pg_name}` : `${space} * ${pg_name}`
-            )).join(' + ');
-            const rm_osd_pg_count = (prev_pg_per_osd[osd]||[])
-                .reduce((a, [ old_pg_name, space ]) => (a + (all_pgs_hash[old_pg_name] ? space : 0)), 0);
-            const osd_pg_count = all_weights[osd]*pg_effsize/total_weight*pg_count - rm_osd_pg_count;
+            const osd_sum = (pg_per_osd[osd]||[]).map(pg_name => prev_weights[pg_name] ? `add_${pg_name} - del_${pg_name}` : pg_name).join(' + ');
+            const rm_osd_pg_count = (prev_pg_per_osd[osd]||[]).filter(old_pg_name => move_weights[old_pg_name]).length;
+            let osd_pg_count = all_weights[osd]*3/total_weight*pg_count - rm_osd_pg_count;
             lp += osd_sum + ' <= ' + osd_pg_count + ';\n';
         }
     }
@@ -336,7 +221,7 @@ async function optimize_change({ prev_pgs: prev_int_pgs, osd_tree, pg_size = 3,
     const weights = { ...prev_weights };
     for (const k in prev_weights)
     {
-        if (!all_pgs_hash[k])
+        if (!move_weights[k])
         {
             delete weights[k];
         }
@@ -351,7 +236,7 @@ async function optimize_change({ prev_pgs: prev_int_pgs, osd_tree, pg_size = 3,
         {
             weights[k.substr(4)] = (weights[k.substr(4)] || 0) - Number(lp_result.vars[k]);
         }
-        else if (k.substr(0, 3) === 'pg_')
+        else
         {
             weights[k] = Number(lp_result.vars[k]);
         }
@@ -373,7 +258,7 @@ async function optimize_change({ prev_pgs: prev_int_pgs, osd_tree, pg_size = 3,
         {
             differs++;
         }
-        for (let j = 0; j < pg_size; j++)
+        for (let j = 0; j < 3; j++)
         {
             if (new_pgs[i][j] != prev_int_pgs[i][j])
             {
@@ -388,7 +273,7 @@ async function optimize_change({ prev_pgs: prev_int_pgs, osd_tree, pg_size = 3,
         int_pgs: new_pgs,
         differs,
         osd_differs,
-        space: pg_effsize * pg_list_space_efficiency(new_pgs, all_weights, pg_minsize, parity_space),
+        space: pg_size * pg_list_space_efficiency(new_pgs, all_weights),
         total_space: total_weight,
     };
 }
@@ -506,155 +391,64 @@ function extract_osds(osd_tree, levels, osd_level, osds = {})
     return osds;
 }
 
-// ordered = don't treat (x,y) and (y,x) as equal
-function random_combinations(osd_tree, pg_size, count, ordered)
-{
-    let seed = 0x5f020e43;
-    let rng = () =>
-    {
-        seed ^= seed << 13;
-        seed ^= seed >> 17;
-        seed ^= seed << 5;
-        return seed + 2147483648;
-    };
-    const hosts = Object.keys(osd_tree).sort();
-    const osds = Object.keys(osd_tree).reduce((a, c) => { a[c] = Object.keys(osd_tree[c]).sort(); return a; }, {});
-    const r = {};
-    // Generate random combinations including each OSD at least once
-    for (let h = 0; h < hosts.length; h++)
-    {
-        for (let o = 0; o < osds[hosts[h]].length; o++)
-        {
-            const pg = [ osds[hosts[h]][o] ];
-            const cur_hosts = [ ...hosts ];
-            cur_hosts.splice(h, 1);
-            for (let i = 1; i < pg_size && i < hosts.length; i++)
-            {
-                const next_host = rng() % cur_hosts.length;
-                const next_osd = rng() % osds[cur_hosts[next_host]].length;
-                pg.push(osds[cur_hosts[next_host]][next_osd]);
-                cur_hosts.splice(next_host, 1);
-            }
-            const cyclic_pgs = [ pg ];
-            if (ordered)
-            {
-                for (let i = 1; i < pg.size; i++)
-                {
-                    cyclic_pgs.push([ ...pg.slice(i), ...pg.slice(0, i) ]);
-                }
-            }
-            for (const pg of cyclic_pgs)
-            {
-                while (pg.length < pg_size)
-                {
-                    pg.push(NO_OSD);
-                }
-                r['pg_'+pg.join('_')] = pg;
-            }
-        }
-    }
-    // Generate purely random combinations
-    while (count > 0)
-    {
-        let host_idx = [];
-        const cur_hosts = [ ...hosts.map((h, i) => i) ];
-        const max_hosts = pg_size < hosts.length ? pg_size : hosts.length;
-        if (ordered)
-        {
-            for (let i = 0; i < max_hosts; i++)
-            {
-                const r = rng() % cur_hosts.length;
-                host_idx[i] = cur_hosts[r];
-                cur_hosts.splice(r, 1);
-            }
-        }
-        else
-        {
-            for (let i = 0; i < max_hosts; i++)
-            {
-                const r = rng() % (cur_hosts.length - (max_hosts - i - 1));
-                host_idx[i] = cur_hosts[r];
-                cur_hosts.splice(0, r+1);
-            }
-        }
-        let pg = host_idx.map(h => osds[hosts[h]][rng() % osds[hosts[h]].length]);
-        while (pg.length < pg_size)
-        {
-            pg.push(NO_OSD);
-        }
-        r['pg_'+pg.join('_')] = pg;
-        count--;
-    }
-    return r;
-}
-
-// Super-stupid algorithm. Given the current OSD tree, generate all possible OSD combinations
+// FIXME: support different pg_sizes, not just 3
 // osd_tree = { failure_domain1: { osd1: size1, ... }, ... }
-// ordered = return combinations without duplicates having different order
-function all_combinations(osd_tree, pg_size, ordered, count)
+function all_combinations(osd_tree, count, ordered)
 {
     const hosts = Object.keys(osd_tree).sort();
     const osds = Object.keys(osd_tree).reduce((a, c) => { a[c] = Object.keys(osd_tree[c]).sort(); return a; }, {});
-    while (hosts.length < pg_size)
+    while (hosts.length < 3)
     {
         osds[NO_OSD] = [ NO_OSD ];
         hosts.push(NO_OSD);
     }
-    let host_idx = [];
-    let osd_idx = [];
-    for (let i = 0; i < pg_size; i++)
-    {
-        host_idx.push(i);
-        osd_idx.push(0);
-    }
+    let host_idx = [ 0, 1, 2 ];
+    let osd_idx = [ 0, 0, 0 ];
     const r = [];
     while (!count || count < 0 || r.length < count)
     {
-        r.push(host_idx.map((hi, i) => osds[hosts[hi]][osd_idx[i]]));
-        let inc = pg_size-1;
-        while (inc >= 0)
+        let inc;
+        if (host_idx[2] != host_idx[1] && host_idx[2] != host_idx[0] && host_idx[1] != host_idx[0])
         {
-            osd_idx[inc]++;
-            if (osd_idx[inc] >= osds[hosts[host_idx[inc]]].length)
+            r.push(host_idx.map((hi, i) => osds[hosts[hi]][osd_idx[i]]));
+            inc = 2;
+            while (inc >= 0)
             {
-                osd_idx[inc] = 0;
-                inc--;
-            }
-            else
-            {
-                break;
-            }
-        }
-        if (inc < 0)
-        {
-            // no osds left in the current host combination, select the next one
-            inc = pg_size-1;
-            same_again: while (inc >= 0)
-            {
-                host_idx[inc]++;
-                for (let prev_host = 0; prev_host < inc; prev_host++)
+                osd_idx[inc]++;
+                if (osd_idx[inc] >= osds[hosts[host_idx[inc]]].length)
                 {
-                    if (host_idx[prev_host] == host_idx[inc])
-                    {
-                        continue same_again;
-                    }
-                }
-                if (host_idx[inc] < (ordered ? hosts.length-(pg_size-1-inc) : hosts.length))
-                {
-                    while ((++inc) < pg_size)
-                    {
-                        host_idx[inc] = (ordered ? host_idx[inc-1]+1 : 0);
-                    }
-                    break;
+                    osd_idx[inc] = 0;
+                    inc--;
                 }
                 else
                 {
-                    inc--;
+                    break;
                 }
             }
-            if (inc < 0)
+        }
+        else
+        {
+            inc = -1;
+        }
+        if (inc < 0)
+        {
+            // no osds left in current host combination, select the next one
+            osd_idx = [ 0, 0, 0 ];
+            host_idx[2]++;
+            if (host_idx[2] >= hosts.length)
             {
-                break;
+                host_idx[1]++;
+                host_idx[2] = ordered ? host_idx[1]+1 : 0;
+                if ((ordered ? host_idx[2] : host_idx[1]) >= hosts.length)
+                {
+                    host_idx[0]++;
+                    host_idx[1] = ordered ? host_idx[0]+1 : 0;
+                    host_idx[2] = ordered ? host_idx[1]+1 : 0;
+                    if ((ordered ? host_idx[2] : host_idx[0]) >= hosts.length)
+                    {
+                        break;
+                    }
+                }
             }
         }
     }
@@ -674,15 +468,14 @@ function pg_weights_space_efficiency(weights, pg_count, osd_sizes)
     return pg_per_osd_space_efficiency(per_osd, pg_count, osd_sizes);
 }
 
-function pg_list_space_efficiency(pgs, osd_sizes, pg_minsize, parity_space)
+function pg_list_space_efficiency(pgs, osd_sizes)
 {
     const per_osd = {};
     for (const pg of pgs)
     {
-        for (let i = 0; i < pg.length; i++)
+        for (const osd of pg)
         {
-            const osd = pg[i];
-            per_osd[osd] = (per_osd[osd]||0) + (i >= pg_minsize ? (parity_space||1) : 1);
+            per_osd[osd] = (per_osd[osd]||0) + 1;
         }
     }
     return pg_per_osd_space_efficiency(per_osd, pgs.length, osd_sizes);
@@ -724,6 +517,5 @@ module.exports = {
     lp_solve,
     make_int_pgs,
     align_pgs,
-    random_combinations,
     all_combinations,
 };

lp/mon-main.js

@@ -1,8 +1,5 @@
 #!/usr/bin/node
 
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 (see README.md for details)
-
 const Mon = require('./mon.js');
 
 const options = {};
@@ -18,8 +15,8 @@ for (let i = 2; i < process.argv.length; i++)
 
 if (!options.etcd_url)
 {
-    console.error('USAGE: '+process.argv[0]+' '+process.argv[1]+' --etcd_url "http://127.0.0.1:2379,..." --etcd_prefix "/vitastor" --etcd_start_timeout 5 [--verbose 1]');
+    console.error('USAGE: '+process.argv[0]+' '+process.argv[1]+' --etcd_url "http://127.0.0.1:2379,..." --etcd_prefix "/rage" --etcd_start_timeout 5');
     process.exit();
 }
 
-new Mon(options).start().catch(e => { console.error(e); process.exit(); });
+new Mon(options).start();

lp/mon.js

@@ -0,0 +1,858 @@
+const http = require('http');
+const os = require('os');
+const WebSocket = require('ws');
+const LPOptimizer = require('./lp-optimizer.js');
+const stableStringify = require('./stable-stringify.js');
+
+class Mon
+{
+    static etcd_tree = {
+        config: {
+            global: null,
+            /* placement_tree = {
+                levels: { datacenter: 1, rack: 2, host: 3, osd: 4, ... },
+                nodes: { host1: { level: 'host', parent: 'rack1' }, ... },
+                failure_domain: 'host',
+            } */
+            placement_tree: null,
+            osd: {},
+            pgs: {},
+        },
+        osd: {
+            state: {},
+            stats: {},
+        },
+        mon: {
+            master: null,
+        },
+        pg: {
+            change_stamp: null,
+            state: {},
+            stats: {},
+            history: {},
+        },
+    }
+
+    constructor(config)
+    {
+        // FIXME: Maybe prefer local etcd
+        this.etcd_urls = [];
+        for (let url of config.etcd_url.split(/,/))
+        {
+            let scheme = 'http';
+            url = url.trim().replace(/^(https?):\/\//, (m, m1) => { scheme = m1; return ''; });
+            if (!/\/[^\/]/.exec(url))
+                url += '/v3';
+            this.etcd_urls.push(scheme+'://'+url);
+        }
+        this.etcd_prefix = config.etcd_prefix || '/rage';
+        this.etcd_prefix = this.etcd_prefix.replace(/\/\/+/g, '/').replace(/^\/?(.*[^\/])\/?$/, '/$1');
+        this.etcd_start_timeout = (config.etcd_start_timeout || 5) * 1000;
+        this.state = JSON.parse(JSON.stringify(Mon.etcd_tree));
+    }
+
+    async start()
+    {
+        await this.load_config();
+        await this.get_lease();
+        await this.become_master();
+        await this.load_cluster_state();
+        await this.start_watcher();
+        await this.recheck_pgs();
+    }
+
+    async load_config()
+    {
+        const res = await this.etcd_call('/txn', { success: [
+            { requestRange: { key: b64(this.etcd_prefix+'/config/global') } }
+        ] }, this.etcd_start_timeout, -1);
+        this.parse_kv(res.responses[0].response_range.kvs[0]);
+        this.check_config();
+    }
+
+    check_config()
+    {
+        this.config.etcd_mon_timeout = Number(this.config.etcd_mon_timeout) || 0;
+        if (this.config.etcd_mon_timeout <= 0)
+        {
+            this.config.etcd_mon_timeout = 1000;
+        }
+        this.config.etcd_mon_retries = Number(this.config.etcd_mon_retries) || 5;
+        if (this.config.etcd_mon_retries < 0)
+        {
+            this.config.etcd_mon_retries = 0;
+        }
+        this.config.mon_change_timeout = Number(this.config.mon_change_timeout) || 1000;
+        if (this.config.mon_change_timeout < 100)
+        {
+            this.config.mon_change_timeout = 100;
+        }
+        this.config.mon_stats_timeout = Number(this.config.mon_stats_timeout) || 1000;
+        if (this.config.mon_stats_timeout < 100)
+        {
+            this.config.mon_stats_timeout = 100;
+        }
+        // After this number of seconds, a dead OSD will be removed from PG distribution
+        this.config.osd_out_time = Number(this.config.osd_out_time) || 0;
+        if (!this.config.osd_out_time)
+        {
+            this.config.osd_out_time = 30*60; // 30 minutes by default
+        }
+        this.config.max_osd_combinations = Number(this.config.max_osd_combinations) || 10000;
+        if (this.config.max_osd_combinations < 100)
+        {
+            this.config.max_osd_combinations = 100;
+        }
+    }
+
+    async start_watcher(retries)
+    {
+        let retry = 0;
+        if (retries >= 0 && retries < 1)
+        {
+            retries = 1;
+        }
+        while (retries < 0 || retry < retries)
+        {
+            const base = 'ws'+this.etcd_urls[Math.floor(Math.random()*this.etcd_urls.length)].substr(4);
+            const ok = await new Promise((ok, no) =>
+            {
+                const timer_id = setTimeout(() =>
+                {
+                    this.ws.close();
+                    ok(false);
+                }, timeout);
+                this.ws = new WebSocket(base+'/watch');
+                this.ws.on('open', () =>
+                {
+                    if (timer_id)
+                        clearTimeout(timer_id);
+                    ok(true);
+                });
+            });
+            if (!ok)
+            {
+                this.ws = null;
+            }
+            retry++;
+        }
+        if (!this.ws)
+        {
+            this.die('Failed to open etcd watch websocket');
+        }
+        this.ws.send(JSON.stringify({
+            create_request: {
+                key: b64(this.etcd_prefix+'/'),
+                range_end: b64(this.etcd_prefix+'0'),
+                start_revision: ''+this.etcd_watch_revision,
+                watch_id: 1,
+            },
+        }));
+        this.ws.on('message', (msg) =>
+        {
+            let data;
+            try
+            {
+                data = JSON.parse(msg);
+            }
+            catch (e)
+            {
+            }
+            if (!data || !data.result || !data.result.events)
+            {
+                console.error('Garbage received from watch websocket: '+msg);
+            }
+            else
+            {
+                let stats_changed = false, changed = false;
+                console.log('Revision '+data.result.header.revision+' events: ');
+                for (const e of data.result.events)
+                {
+                    this.parse_kv(e.kv);
+                    const key = e.kv.key.substr(this.etcd_prefix.length);
+                    if (key.substr(0, 11) == '/osd/stats/' || key.substr(0, 10) == '/pg/stats/')
+                    {
+                        stats_changed = true;
+                    }
+                    else if (key != '/stats')
+                    {
+                        changed = true;
+                    }
+                    console.log(e);
+                }
+                if (stats_changed)
+                {
+                    this.schedule_update_stats();
+                }
+                if (changed)
+                {
+                    this.schedule_recheck();
+                }
+            }
+        });
+    }
+
+    async get_lease()
+    {
+        const max_ttl = this.config.etcd_mon_ttl + this.config.etcd_mon_timeout/1000*this.config.etcd_mon_retries;
+        const res = await this.etcd_call('/lease/grant', { TTL: max_ttl }, this.config.etcd_mon_timeout, this.config.etcd_mon_retries);
+        this.etcd_lease_id = res.ID;
+        setInterval(async () =>
+        {
+            const res = await this.etcd_call('/lease/keepalive', { ID: this.etcd_lease_id }, this.config.etcd_mon_timeout, this.config.etcd_mon_retries);
+            if (!res.result.TTL)
+            {
+                this.die('Lease expired');
+            }
+        }, config.etcd_mon_timeout);
+    }
+
+    async become_master()
+    {
+        const state = { ip: this.local_ips() };
+        while (1)
+        {
+            const res = await this.etcd_call('/txn', {
+                compare: [ { target: 'CREATE', create_revision: 0, key: b64(this.etcd_prefix+'/mon/master') } ],
+                success: [ { key: b64(this.etcd_prefix+'/mon/master'), value: b64(JSON.stringify(state)), lease: ''+this.etcd_lease_id } ],
+            }, this.etcd_start_timeout, 0);
+            if (!res.succeeded)
+            {
+                await new Promise(ok => setTimeout(ok, this.etcd_start_timeout));
+            }
+        }
+    }
+
+    async load_cluster_state()
+    {
+        const res = await this.etcd_call('/txn', { success: [
+            { requestRange: { key: b64(this.etcd_prefix+'/'), range_end: b64(this.etcd_prefix+'0') } },
+        ] }, this.etcd_start_timeout, -1);
+        this.etcd_watch_revision = BigInt(res.header.revision)+BigInt(1);
+        const data = JSON.parse(JSON.stringify(Mon.etcd_tree));
+        for (const response of res.responses)
+        {
+            for (const kv of response.response_range.kvs)
+            {
+                this.parse_kv(kv);
+            }
+        }
+        this.state = data;
+    }
+
+    all_osds()
+    {
+        return Object.keys(this.state.osd.stats);
+    }
+
+    get_osd_tree()
+    {
+        this.state.config.placement_tree = this.state.config.placement_tree||{};
+        const levels = this.state.config.placement_tree.levels||{};
+        levels.host = levels.host || 100;
+        levels.osd = levels.osd || 101;
+        const tree = { '': { children: [] } };
+        for (const node_id in this.state.config.placement_tree.nodes||{})
+        {
+            const node_cfg = this.state.config.placement_tree.nodes[node_id];
+            if (!node_id || /^\d/.exec(node_id) ||
+                !node_cfg.level || !levels[node_cfg.level])
+            {
+                // All nodes must have non-empty non-numeric IDs and valid levels
+                continue;
+            }
+            tree[node_id] = { id: node_id, level: node_cfg.level, parent: node_cfg.parent, children: [] };
+        }
+        // This requires monitor system time to be in sync with OSD system times (at least to some extent)
+        const down_time = Date.now()/1000 - this.config.osd_out_time;
+        for (const osd_num of this.all_osds().sort((a, b) => a - b))
+        {
+            const stat = this.state.osd.stats[osd_num];
+            if (stat.size && (this.state.osd.state[osd_num] || Number(stat.time) >= down_time))
+            {
+                // Numeric IDs are reserved for OSDs
+                const reweight = this.state.config.osd[osd_num] && Number(this.state.config.osd[osd_num].reweight) || 1;
+                tree[osd_num] = tree[osd_num] || { id: osd_num, parent: stat.host };
+                tree[osd_num].level = 'osd';
+                tree[osd_num].size = reweight * stat.size / 1024 / 1024 / 1024 / 1024; // terabytes
+                delete tree[osd_num].children;
+            }
+        }
+        for (const node_id in tree)
+        {
+            if (node_id === '')
+            {
+                continue;
+            }
+            const node_cfg = tree[node_id];
+            const node_level = levels[node_cfg.level] || node_cfg.level;
+            let parent_level = node_cfg.parent && tree[node_cfg.parent] && tree[node_cfg.parent].children
+                && tree[node_cfg.parent].level;
+            parent_level = parent_level ? (levels[parent_level] || parent_level) : null;
+            // Parent's level must be less than child's; OSDs must be leaves
+            const parent = parent_level && parent_level < node_level ? tree[node_cfg.parent] : '';
+            tree[parent].children.push(tree[node_id]);
+            delete node_cfg.parent;
+        }
+        return LPOptimizer.flatten_tree(tree[''].children, levels, this.state.config.failure_domain, 'osd');
+    }
+
+    async stop_all_pgs()
+    {
+        let has_online = false, paused = true;
+        for (const pg in this.state.config.pgs.items||{})
+        {
+            const cur_state = ((this.state.pg.state[pg]||{}).state||[]).join(',');
+            if (cur_state != '' && cur_state != 'offline')
+            {
+                has_online = true;
+            }
+            if (!this.state.config.pgs.items[pg].pause)
+            {
+                paused = false;
+            }
+        }
+        if (!paused)
+        {
+            console.log('Stopping all PGs before changing PG count');
+            const new_cfg = JSON.parse(JSON.stringify(this.state.config.pgs));
+            for (const pg in new_cfg.items)
+            {
+                new_cfg.items[pg].pause = true;
+            }
+            // Check that no OSDs change their state before we pause PGs
+            // Doing this we make sure that OSDs don't wake up in the middle of our "transaction"
+            // and can't see the old PG configuration
+            const checks = [];
+            for (const osd_num of this.all_osds())
+            {
+                const key = b64(this.etcd_prefix+'/osd/state/'+osd_num);
+                checks.push({ key, target: 'MOD', result: 'LESS', mod_revision: ''+this.etcd_watch_revision });
+            }
+            const res = await this.etcd_call('/txn', {
+                compare: [
+                    { key: b64(this.etcd_prefix+'/mon/master'), target: 'LEASE', lease: ''+this.etcd_lease_id },
+                    { key: b64(this.etcd_prefix+'/config/pgs'), target: 'MOD', mod_revision: ''+this.etcd_watch_revision, result: 'LESS' },
+                    ...checks,
+                ],
+                success: [
+                    { requestPut: { key: b64(this.etcd_prefix+'/config/pgs'), value: b64(JSON.stringify(new_cfg)) } },
+                ],
+            }, this.config.etcd_mon_timeout, 0);
+            if (!res.succeeded)
+            {
+                return false;
+            }
+            this.state.config.pgs = new_cfg;
+        }
+        return !has_online;
+    }
+
+    scale_pg_count(prev_pgs, pg_history, new_pg_count)
+    {
+        const old_pg_count = prev_pgs.length;
+        // Add all possibly intersecting PGs into the history of new PGs
+        if (!(new_pg_count % old_pg_count))
+        {
+            // New PG count is a multiple of the old PG count
+            const mul = (new_pg_count / old_pg_count);
+            for (let i = 0; i < new_pg_count; i++)
+            {
+                const old_i = Math.floor(new_pg_count / mul);
+                pg_history[i] = JSON.parse(JSON.stringify(this.state.pg.history[1+old_i]));
+            }
+        }
+        else if (!(old_pg_count % new_pg_count))
+        {
+            // Old PG count is a multiple of the new PG count
+            const mul = (old_pg_count / new_pg_count);
+            for (let i = 0; i < new_pg_count; i++)
+            {
+                pg_history[i] = {
+                    osd_sets: [],
+                    all_peers: [],
+                };
+                for (let j = 0; j < mul; j++)
+                {
+                    pg_history[i].osd_sets.push(prev_pgs[i*mul]);
+                    const hist = this.state.pg.history[1+i*mul+j];
+                    if (hist && hist.osd_sets && hist.osd_sets.length)
+                    {
+                        Array.prototype.push.apply(pg_history[i].osd_sets, hist.osd_sets);
+                    }
+                    if (hist && hist.all_peers && hist.all_peers.length)
+                    {
+                        Array.prototype.push.apply(pg_history[i].all_peers, hist.all_peers);
+                    }
+                }
+            }
+        }
+        else
+        {
+            // Any PG may intersect with any PG after non-multiple PG count change
+            // So, merge ALL PGs history
+            let all_sets = {};
+            let all_peers = {};
+            for (const pg of prev_pgs)
+            {
+                all_sets[pg.join(' ')] = pg;
+            }
+            for (const pg in this.state.pg.history)
+            {
+                const hist = this.state.pg.history[pg];
+                if (hist && hist.osd_sets)
+                {
+                    for (const pg of hist.osd_sets)
+                    {
+                        all_sets[pg.join(' ')] = pg;
+                    }
+                }
+                if (hist && hist.all_peers)
+                {
+                    for (const osd_num of hist.all_peers)
+                    {
+                        all_peers[osd_num] = Number(osd_num);
+                    }
+                }
+            }
+            all_sets = Object.values(all_sets);
+            all_peers = Object.values(all_peers);
+            for (let i = 0; i < new_pg_count; i++)
+            {
+                pg_history[i] = { osd_sets: all_sets, all_peers };
+            }
+        }
+        // Mark history keys for removed PGs as removed
+        for (let i = new_pg_count; i < old_pg_count; i++)
+        {
+            pg_history[i] = null;
+        }
+        if (old_pg_count < new_pg_count)
+        {
+            for (let i = new_pg_count-1; i >= 0; i--)
+            {
+                prev_pgs[i] = prev_pgs[Math.floor(i/new_pg_count*old_pg_count)];
+            }
+        }
+        else if (old_pg_count > new_pg_count)
+        {
+            for (let i = 0; i < new_pg_count; i++)
+            {
+                prev_pgs[i] = prev_pgs[Math.round(i/new_pg_count*old_pg_count)];
+            }
+            prev_pgs.splice(new_pg_count, old_pg_count-new_pg_count);
+        }
+    }
+
+    async save_new_pgs(prev_pgs, new_pgs, pg_history, tree_hash)
+    {
+        const txn = [], checks = [];
+        const pg_items = {};
+        new_pgs.map((osd_set, i) =>
+        {
+            osd_set = osd_set.map(osd_num => osd_num === LPOptimizer.NO_OSD ? 0 : osd_num);
+            const alive_set = osd_set.filter(osd_num => osd_num);
+            pg_items[i+1] = {
+                osd_set,
+                primary: alive_set.length ? alive_set[Math.floor(Math.random()*alive_set.length)] : 0,
+            };
+            if (prev_pgs[i] && prev_pgs[i].join(' ') != osd_set.join(' '))
+            {
+                pg_history[i] = pg_history[i] || {};
+                pg_history[i].osd_sets = pg_history[i].osd_sets || [];
+                pg_history[i].osd_sets.push(prev_pgs[i]);
+            }
+        });
+        for (let i = 0; i < new_pgs.length || i < prev_pgs.length; i++)
+        {
+            checks.push({
+                key: b64(this.etcd_prefix+'/pg/history/'+(i+1)),
+                target: 'MOD',
+                mod_revision: ''+this.etcd_watch_revision,
+                result: 'LESS',
+            });
+            if (pg_history[i])
+            {
+                txn.push({
+                    requestPut: {
+                        key: b64(this.etcd_prefix+'/pg/history/'+(i+1)),
+                        value: b64(JSON.stringify(pg_history[i])),
+                    },
+                });
+            }
+            else
+            {
+                txn.push({
+                    requestDeleteRange: {
+                        key: b64(this.etcd_prefix+'/pg/history/'+(i+1)),
+                    },
+                });
+            }
+        }
+        this.state.config.pgs = {
+            hash: tree_hash,
+            items: pg_items,
+        };
+        const res = await this.etcd_call('/txn', {
+            compare: [
+                { key: b64(this.etcd_prefix+'/mon/master'), target: 'LEASE', lease: ''+this.etcd_lease_id },
+                { key: b64(this.etcd_prefix+'/config/pgs'), target: 'MOD', mod_revision: ''+this.etcd_watch_revision, result: 'LESS' },
+                ...checks,
+            ],
+            success: [
+                { requestPut: { key: b64(this.etcd_prefix+'/config/pgs'), value: b64(JSON.stringify(this.state.config.pgs)) } },
+                ...txn,
+            ],
+        }, this.config.etcd_mon_timeout, 0);
+        return res.succeeded;
+    }
+
+    async recheck_pgs()
+    {
+        // Take configuration and state, check it against the stored configuration hash
+        // Recalculate PGs and save them to etcd if the configuration is changed
+        const tree_cfg = {
+            osd_tree: this.get_osd_tree(),
+            pg_count: this.config.pg_count || Object.keys(this.state.config.pgs.items||{}).length || 128,
+            max_osd_combinations: this.config.max_osd_combinations,
+        };
+        const tree_hash = sha1hex(stableStringify(tree_cfg));
+        if (this.state.config.pgs.hash != tree_hash)
+        {
+            // Something has changed
+            const prev_pgs = [];
+            for (const pg in this.state.config.pgs.items||{})
+            {
+                prev_pgs[pg-1] = this.state.config.pgs.items[pg].osd_set;
+            }
+            const pg_history = [];
+            const old_pg_count = prev_pgs.length;
+            let optimize_result;
+            if (old_pg_count > 0)
+            {
+                if (old_pg_count != tree_cfg.pg_count)
+                {
+                    // PG count changed. Need to bring all PGs down.
+                    if (!await this.stop_all_pgs())
+                    {
+                        this.schedule_recheck();
+                        return;
+                    }
+                    this.scale_pg_count(prev_pgs, pg_history, new_pg_count);
+                }
+                optimize_result = await LPOptimizer.optimize_change(prev_pgs, tree_cfg.osd_tree, tree_cfg.max_osd_combinations);
+            }
+            else
+            {
+                optimize_result = await LPOptimizer.optimize_initial(tree_cfg.osd_tree, tree_cfg.pg_count, tree_cfg.max_osd_combinations);
+            }
+            if (!await this.save_new_pgs(prev_pgs, optimize_result.int_pgs, pg_history, tree_hash))
+            {
+                console.log('Someone changed PG configuration while we also tried to change it. Retrying in '+this.config.mon_change_timeout+' ms');
+                this.schedule_recheck();
+                return;
+            }
+            console.log('PG configuration successfully changed');
+            if (old_pg_count != optimize_result.int_pgs.length)
+            {
+                console.log(`PG count changed from: ${old_pg_count} to ${optimize_result.int_pgs.length}`);
+            }
+            LPOptimizer.print_change_stats(optimize_result);
+        }
+    }
+
+    schedule_recheck()
+    {
+        if (this.recheck_timer)
+        {
+            clearTimeout(this.recheck_timer);
+            this.recheck_timer = null;
+        }
+        this.recheck_timer = setTimeout(() =>
+        {
+            this.recheck_timer = null;
+            this.recheck_pgs().catch(console.error);
+        }, this.config.mon_change_timeout || 1000);
+    }
+
+    sum_stats()
+    {
+        let overflow = false;
+        this.prev_stats = this.prev_stats || { op_stats: {}, subop_stats: {}, recovery_stats: {} };
+        const op_stats = {}, subop_stats = {}, recovery_stats = {};
+        for (const osd in this.state.osd.stats)
+        {
+            const st = this.state.osd.stats[osd];
+            for (const op in st.op_stats||{})
+            {
+                op_stats[op] = op_stats[op] || { count: 0n, usec: 0n, bytes: 0n };
+                op_stats[op].count += BigInt(st.op_stats.count||0);
+                op_stats[op].usec += BigInt(st.op_stats.usec||0);
+                op_stats[op].bytes += BigInt(st.op_stats.bytes||0);
+            }
+            for (const op in st.subop_stats||{})
+            {
+                subop_stats[op] = subop_stats[op] || { count: 0n, usec: 0n };
+                subop_stats[op].count += BigInt(st.subop_stats.count||0);
+                subop_stats[op].usec += BigInt(st.subop_stats.usec||0);
+            }
+            for (const op in st.recovery_stats||{})
+            {
+                recovery_stats[op] = recovery_stats[op] || { count: 0n, bytes: 0n };
+                recovery_stats[op].count += BigInt(st.recovery_stats.count||0);
+                recovery_stats[op].bytes += BigInt(st.recovery_stats.bytes||0);
+            }
+        }
+        for (const op in op_stats)
+        {
+            if (op_stats[op].count >= 0x10000000000000000n)
+            {
+                if (!this.prev_stats.op_stats[op])
+                {
+                    overflow = true;
+                }
+                else
+                {
+                    op_stats[op].count -= this.prev_stats.op_stats[op].count;
+                    op_stats[op].usec -= this.prev_stats.op_stats[op].usec;
+                    op_stats[op].bytes -= this.prev_stats.op_stats[op].bytes;
+                }
+            }
+        }
+        for (const op in subop_stats)
+        {
+            if (subop_stats[op].count >= 0x10000000000000000n)
+            {
+                if (!this.prev_stats.subop_stats[op])
+                {
+                    overflow = true;
+                }
+                else
+                {
+                    subop_stats[op].count -= this.prev_stats.subop_stats[op].count;
+                    subop_stats[op].usec -= this.prev_stats.subop_stats[op].usec;
+                }
+            }
+        }
+        for (const op in recovery_stats)
+        {
+            if (recovery_stats[op].count >= 0x10000000000000000n)
+            {
+                if (!this.prev_stats.recovery_stats[op])
+                {
+                    overflow = true;
+                }
+                else
+                {
+                    recovery_stats[op].count -= this.prev_stats.recovery_stats[op].count;
+                    recovery_stats[op].bytes -= this.prev_stats.recovery_stats[op].bytes;
+                }
+            }
+        }
+        const object_counts = { object: 0n, clean: 0n, misplaced: 0n, degraded: 0n, incomplete: 0n };
+        for (const pg_num in this.state.pg.stats)
+        {
+            const st = this.state.pg.stats[pg_num];
+            for (const k in object_counts)
+            {
+                if (st[k+'_count'])
+                {
+                    object_counts[k] += BigInt(st[k+'_count']);
+                }
+            }
+        }
+        return (this.prev_stats = { overflow, op_stats, subop_stats, recovery_stats, object_counts });
+    }
+
+    async update_total_stats()
+    {
+        const stats = this.sum_stats();
+        if (!stats.overflow)
+        {
+            // Convert to strings, serialize and save
+            const ser = {};
+            for (const st of [ 'op_stats', 'subop_stats', 'recovery_stats' ])
+            {
+                ser[st] = {};
+                for (const op in stats[st])
+                {
+                    ser[st][op] = {};
+                    for (const k in stats[st][op])
+                    {
+                        ser[st][op][k] = ''+stats[st][op][k];
+                    }
+                }
+            }
+            ser.object_counts = {};
+            for (const k in stats.object_counts)
+            {
+                ser.object_counts[k] = ''+stats.object_counts[k];
+            }
+            await this.etcd_call('/txn', {
+                success: [ { requestPut: { key: b64(this.etcd_prefix+'/stats'), value: b64(JSON.stringify(ser)) } } ],
+            }, this.config.etcd_mon_timeout, 0);
+        }
+    }
+
+    schedule_update_stats()
+    {
+        if (this.stats_timer)
+        {
+            clearTimeout(this.stats_timer);
+            this.stats_timer = null;
+        }
+        this.stats_timer = setTimeout(() =>
+        {
+            this.stats_timer = null;
+            this.update_total_stats().catch(console.error);
+        }, this.config.mon_stats_timeout || 1000);
+    }
+
+    parse_kv(kv)
+    {
+        if (!kv || !kv.key)
+        {
+            return;
+        }
+        kv.key = de64(kv.key);
+        kv.value = kv.value ? JSON.parse(de64(kv.value)) : null;
+        const key = kv.key.substr(this.etcd_prefix.length).replace(/^\/+/, '').split('/');
+        const cur = this.state, orig = Mon.etcd_tree;
+        for (let i = 0; i < key.length-1; i++)
+        {
+            if (!orig[key[i]])
+            {
+                console.log('Bad key in etcd: '+kv.key+' = '+kv.value);
+                return;
+            }
+            orig = orig[key[i]];
+            cur = (cur[key[i]] = cur[key[i]] || {});
+        }
+        if (orig[key.length-1])
+        {
+            console.log('Bad key in etcd: '+kv.key+' = '+kv.value);
+            return;
+        }
+        cur[key[key.length-1]] = kv.value;
+        if (key.join('/') === 'config/global')
+        {
+            this.state.config.global = this.state.config.global || {};
+            this.config = this.state.config.global;
+            this.check_config();
+        }
+    }
+
+    async etcd_call(path, body, timeout, retries)
+    {
+        let retry = 0;
+        if (retries >= 0 && retries < 1)
+        {
+            retries = 1;
+        }
+        while (retries < 0 || retry < retries)
+        {
+            const base = this.etcd_urls[Math.floor(Math.random()*this.etcd_urls.length)];
+            const res = await POST(base+path, body, timeout);
+            if (res.json)
+            {
+                if (res.json.error)
+                {
+                    console.log('etcd returned error: '+res.json.error);
+                    break;
+                }
+                return res.json;
+            }
+            retry++;
+        }
+        this.die();
+    }
+
+    die(err)
+    {
+        // In fact we can just try to rejoin
+        console.fatal(err || 'Cluster connection failed');
+        process.exit(1);
+    }
+
+    local_ips()
+    {
+        const ips = [];
+        const ifaces = os.networkInterfaces();
+        for (const ifname in ifaces)
+        {
+            for (const iface of ifaces[ifname])
+            {
+                if (iface.family == 'IPv4' && !iface.internal)
+                {
+                    ips.push(iface.address);
+                }
+            }
+        }
+        return ips;
+    }
+}
+
+function POST(url, body, timeout)
+{
+    return new Promise((ok, no) =>
+    {
+        const body_text = Buffer.from(JSON.stringify(body));
+        let timer_id = timeout > 0 ? setTimeout(() =>
+        {
+            if (req)
+                req.abort();
+            req = null;
+            ok({ error: 'timeout' });
+        }, timeout) : null;
+        let req = http.request(url, { method: 'POST', headers: {
+            'Content-Type': 'application/json',
+            'Content-Length': body_text,
+        } }, (res) =>
+        {
+            if (!req)
+            {
+                return;
+            }
+            clearTimeout(timer_id);
+            if (res.statusCode != 200)
+            {
+                ok({ error: res.statusCode, response: res });
+                return;
+            }
+            let res_body = '';
+            res.setEncoding('utf8');
+            res.on('data', chunk => { res_body += chunk });
+            res.on('end', () =>
+            {
+                try
+                {
+                    res_body = JSON.parse(res_body);
+                    ok({ response: res, json: res_body });
+                }
+                catch (e)
+                {
+                    ok({ error: e, response: res, body: res_body });
+                }
+            });
+        });
+        req.write(body_text);
+        req.end();
+    });
+}
+
+function b64(str)
+{
+    return Buffer.from(str).toString('base64');
+}
+
+function de64(str)
+{
+    return Buffer.from(str, 'base64').toString();
+}
+
+function sha1hex(str)
+{
+    const hash = crypto.createHash('sha1');
+    hash.update(str);
+    return hash.digest('hex');
+}

lp/package.json

@@ -1,15 +1,14 @@
 {
-  "name": "vitastor-mon",
+  "name": "rage-mon",
   "version": "1.0.0",
-  "description": "Vitastor SDS monitor service",
-  "main": "mon-main.js",
+  "description": "RAGE storage monitor service",
+  "main": "mon.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "author": "Vitaliy Filippov",
   "license": "UNLICENSED",
   "dependencies": {
-    "sprintf-js": "^1.1.2",
     "ws": "^7.2.5"
   }
 }

lp/test-optimize-undersized.js

@@ -1,6 +1,3 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 (see README.md for details)
-
 const LPOptimizer = require('./lp-optimizer.js');
 
 const crush_tree = [
@@ -43,31 +40,31 @@ async function run()
 {
     const cur_tree = {};
     console.log('Empty tree:');
-    let res = await LPOptimizer.optimize_initial({ osd_tree: cur_tree, pg_size: 3, pg_count: 256 });
+    let res = await LPOptimizer.optimize_initial(cur_tree, 256);
     LPOptimizer.print_change_stats(res, false);
     console.log('\nAdding 1st failure domain:');
     cur_tree['dom1'] = osd_tree['dom1'];
-    res = await LPOptimizer.optimize_change({ prev_pgs: res.int_pgs, osd_tree: cur_tree, pg_size: 3 });
+    res = await LPOptimizer.optimize_change(res.int_pgs, cur_tree);
     LPOptimizer.print_change_stats(res, false);
     console.log('\nAdding 2nd failure domain:');
     cur_tree['dom2'] = osd_tree['dom2'];
-    res = await LPOptimizer.optimize_change({ prev_pgs: res.int_pgs, osd_tree: cur_tree, pg_size: 3 });
+    res = await LPOptimizer.optimize_change(res.int_pgs, cur_tree);
     LPOptimizer.print_change_stats(res, false);
     console.log('\nAdding 3rd failure domain:');
     cur_tree['dom3'] = osd_tree['dom3'];
-    res = await LPOptimizer.optimize_change({ prev_pgs: res.int_pgs, osd_tree: cur_tree, pg_size: 3 });
+    res = await LPOptimizer.optimize_change(res.int_pgs, cur_tree);
     LPOptimizer.print_change_stats(res, false);
     console.log('\nRemoving 3rd failure domain:');
     delete cur_tree['dom3'];
-    res = await LPOptimizer.optimize_change({ prev_pgs: res.int_pgs, osd_tree: cur_tree, pg_size: 3 });
+    res = await LPOptimizer.optimize_change(res.int_pgs, cur_tree);
     LPOptimizer.print_change_stats(res, false);
     console.log('\nRemoving 2nd failure domain:');
     delete cur_tree['dom2'];
-    res = await LPOptimizer.optimize_change({ prev_pgs: res.int_pgs, osd_tree: cur_tree, pg_size: 3 });
+    res = await LPOptimizer.optimize_change(res.int_pgs, cur_tree);
     LPOptimizer.print_change_stats(res, false);
     console.log('\nRemoving 1st failure domain:');
     delete cur_tree['dom1'];
-    res = await LPOptimizer.optimize_change({ prev_pgs: res.int_pgs, osd_tree: cur_tree, pg_size: 3 });
+    res = await LPOptimizer.optimize_change(res.int_pgs, cur_tree);
     LPOptimizer.print_change_stats(res, false);
 }
 

lp/test-optimize.js

@@ -1,6 +1,3 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 (see README.md for details)
-
 const LPOptimizer = require('./lp-optimizer.js');
 
 const osd_tree = {
@@ -78,37 +75,19 @@ const crush_tree = [
 
 async function run()
 {
-    let res;
-
     // Test: add 1 OSD of almost the same size. Ideal data movement could be 1/12 = 8.33%. Actual is ~13%
-    // Space efficiency is ~99% in all cases.
-
-    console.log('256 PGs, size=2');
-    res = await LPOptimizer.optimize_initial({ osd_tree, pg_size: 2, pg_count: 256 });
+    // Space efficiency is ~99.5% in both cases.
+    let res = await LPOptimizer.optimize_initial(osd_tree, 256);
     LPOptimizer.print_change_stats(res, false);
-    console.log('\nAdding osd.8');
+    console.log('adding osd.8');
     osd_tree[500][8] = 3.58589;
-    res = await LPOptimizer.optimize_change({ prev_pgs: res.int_pgs, osd_tree, pg_size: 2 });
+    res = await LPOptimizer.optimize_change(res.int_pgs, osd_tree);
     LPOptimizer.print_change_stats(res, false);
-    console.log('\nRemoving osd.8');
+    console.log('removing osd.8');
     delete osd_tree[500][8];
-    res = await LPOptimizer.optimize_change({ prev_pgs: res.int_pgs, osd_tree, pg_size: 2 });
+    res = await LPOptimizer.optimize_change(res.int_pgs, osd_tree);
     LPOptimizer.print_change_stats(res, false);
-
-    console.log('\n256 PGs, size=3');
-    res = await LPOptimizer.optimize_initial({ osd_tree, pg_size: 3, pg_count: 256 });
-    LPOptimizer.print_change_stats(res, false);
-    console.log('\nAdding osd.8');
-    osd_tree[500][8] = 3.58589;
-    res = await LPOptimizer.optimize_change({ prev_pgs: res.int_pgs, osd_tree, pg_size: 3 });
-    LPOptimizer.print_change_stats(res, false);
-    console.log('\nRemoving osd.8');
-    delete osd_tree[500][8];
-    res = await LPOptimizer.optimize_change({ prev_pgs: res.int_pgs, osd_tree, pg_size: 3 });
-    LPOptimizer.print_change_stats(res, false);
-
-    console.log('\n256 PGs, size=3, failure domain=rack');
-    res = await LPOptimizer.optimize_initial({ osd_tree: LPOptimizer.flatten_tree(crush_tree, {}, 1, 3), pg_size: 3, pg_count: 256 });
+    res = await LPOptimizer.optimize_initial(LPOptimizer.flatten_tree(crush_tree, {}, 1, 3), 256);
     LPOptimizer.print_change_stats(res, false);
 }
 

messenger.cpp

@@ -0,0 +1,398 @@
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/socket.h>
+#include <sys/epoll.h>
+#include <netinet/tcp.h>
+
+#include "messenger.h"
+
+osd_op_t::~osd_op_t()
+{
+    assert(!bs_op);
+    assert(!op_data);
+    if (rmw_buf)
+    {
+        free(rmw_buf);
+    }
+    if (buf)
+    {
+        // Note: reusing osd_op_t WILL currently lead to memory leaks
+        // So we don't reuse it, but free it every time
+        free(buf);
+    }
+}
+
+void osd_messenger_t::connect_peer(uint64_t peer_osd, json11::Json peer_state)
+{
+    if (wanted_peers.find(peer_osd) == wanted_peers.end())
+    {
+        wanted_peers[peer_osd] = (osd_wanted_peer_t){
+            .address_list = peer_state["addresses"],
+            .port = (int)peer_state["port"].int64_value(),
+        };
+    }
+    else
+    {
+        wanted_peers[peer_osd].address_list = peer_state["addresses"];
+        wanted_peers[peer_osd].port = (int)peer_state["port"].int64_value();
+    }
+    wanted_peers[peer_osd].address_changed = true;
+    if (!wanted_peers[peer_osd].connecting &&
+        (time(NULL) - wanted_peers[peer_osd].last_connect_attempt) >= peer_connect_interval)
+    {
+        try_connect_peer(peer_osd);
+    }
+}
+
+void osd_messenger_t::try_connect_peer(uint64_t peer_osd)
+{
+    auto wp_it = wanted_peers.find(peer_osd);
+    if (wp_it == wanted_peers.end())
+    {
+        return;
+    }
+    if (osd_peer_fds.find(peer_osd) != osd_peer_fds.end())
+    {
+        wanted_peers.erase(peer_osd);
+        return;
+    }
+    auto & wp = wp_it->second;
+    if (wp.address_index >= wp.address_list.array_items().size())
+    {
+        return;
+    }
+    wp.cur_addr = wp.address_list[wp.address_index].string_value();
+    wp.cur_port = wp.port;
+    try_connect_peer_addr(peer_osd, wp.cur_addr.c_str(), wp.cur_port);
+}
+
+void osd_messenger_t::try_connect_peer_addr(osd_num_t peer_osd, const char *peer_host, int peer_port)
+{
+    struct sockaddr_in addr;
+    int r;
+    if ((r = inet_pton(AF_INET, peer_host, &addr.sin_addr)) != 1)
+    {
+        on_connect_peer(peer_osd, -EINVAL);
+        return;
+    }
+    addr.sin_family = AF_INET;
+    addr.sin_port = htons(peer_port ? peer_port : 11203);
+    int peer_fd = socket(AF_INET, SOCK_STREAM, 0);
+    if (peer_fd < 0)
+    {
+        on_connect_peer(peer_osd, -errno);
+        return;
+    }
+    fcntl(peer_fd, F_SETFL, fcntl(peer_fd, F_GETFL, 0) | O_NONBLOCK);
+    int timeout_id = -1;
+    if (peer_connect_timeout > 0)
+    {
+        timeout_id = tfd->set_timer(1000*peer_connect_timeout, false, [this, peer_fd](int timer_id)
+        {
+            osd_num_t peer_osd = clients[peer_fd].osd_num;
+            stop_client(peer_fd);
+            on_connect_peer(peer_osd, -EIO);
+            return;
+        });
+    }
+    r = connect(peer_fd, (sockaddr*)&addr, sizeof(addr));
+    if (r < 0 && errno != EINPROGRESS)
+    {
+        close(peer_fd);
+        on_connect_peer(peer_osd, -errno);
+        return;
+    }
+    assert(peer_osd != this->osd_num);
+    clients[peer_fd] = (osd_client_t){
+        .peer_addr = addr,
+        .peer_port = peer_port,
+        .peer_fd = peer_fd,
+        .peer_state = PEER_CONNECTING,
+        .connect_timeout_id = timeout_id,
+        .osd_num = peer_osd,
+        .in_buf = malloc(receive_buffer_size),
+    };
+    tfd->set_fd_handler(peer_fd, [this](int peer_fd, int epoll_events)
+    {
+        // Either OUT (connected) or HUP
+        handle_connect_epoll(peer_fd);
+    });
+}
+
+void osd_messenger_t::handle_connect_epoll(int peer_fd)
+{
+    auto & cl = clients[peer_fd];
+    if (cl.connect_timeout_id >= 0)
+    {
+        tfd->clear_timer(cl.connect_timeout_id);
+        cl.connect_timeout_id = -1;
+    }
+    osd_num_t peer_osd = cl.osd_num;
+    int result = 0;
+    socklen_t result_len = sizeof(result);
+    if (getsockopt(peer_fd, SOL_SOCKET, SO_ERROR, &result, &result_len) < 0)
+    {
+        result = errno;
+    }
+    if (result != 0)
+    {
+        stop_client(peer_fd);
+        on_connect_peer(peer_osd, -result);
+        return;
+    }
+    int one = 1;
+    setsockopt(peer_fd, SOL_TCP, TCP_NODELAY, &one, sizeof(one));
+    cl.peer_state = PEER_CONNECTED;
+    // FIXME Disable EPOLLOUT on this fd
+    tfd->set_fd_handler(peer_fd, [this](int peer_fd, int epoll_events)
+    {
+        handle_peer_epoll(peer_fd, epoll_events);
+    });
+    // Check OSD number
+    check_peer_config(cl);
+}
+
+void osd_messenger_t::handle_peer_epoll(int peer_fd, int epoll_events)
+{
+    // Mark client as ready (i.e. some data is available)
+    if (epoll_events & EPOLLRDHUP)
+    {
+        // Stop client
+        printf("[OSD %lu] client %d disconnected\n", this->osd_num, peer_fd);
+        stop_client(peer_fd);
+    }
+    else if (epoll_events & EPOLLIN)
+    {
+        // Mark client as ready (i.e. some data is available)
+        auto & cl = clients[peer_fd];
+        cl.read_ready++;
+        if (cl.read_ready == 1)
+        {
+            read_ready_clients.push_back(cl.peer_fd);
+            ringloop->wakeup();
+        }
+    }
+}
+
+void osd_messenger_t::on_connect_peer(osd_num_t peer_osd, int peer_fd)
+{
+    auto & wp = wanted_peers.at(peer_osd);
+    wp.connecting = false;
+    if (peer_fd < 0)
+    {
+        printf("Failed to connect to peer OSD %lu address %s port %d: %s\n", peer_osd, wp.cur_addr.c_str(), wp.cur_port, strerror(-peer_fd));
+        if (wp.address_changed)
+        {
+            wp.address_changed = false;
+            wp.address_index = 0;
+            try_connect_peer(peer_osd);
+        }
+        else if (wp.address_index < wp.address_list.array_items().size()-1)
+        {
+            // Try other addresses
+            wp.address_index++;
+            try_connect_peer(peer_osd);
+        }
+        else
+        {
+            // Retry again in <peer_connect_interval> seconds
+            wp.last_connect_attempt = time(NULL);
+            wp.address_index = 0;
+            tfd->set_timer(1000*peer_connect_interval, false, [this, peer_osd](int)
+            {
+                try_connect_peer(peer_osd);
+            });
+        }
+        return;
+    }
+    printf("Connected with peer OSD %lu (fd %d)\n", peer_osd, peer_fd);
+    wanted_peers.erase(peer_osd);
+    repeer_pgs(peer_osd);
+}
+
+void osd_messenger_t::check_peer_config(osd_client_t & cl)
+{
+    osd_op_t *op = new osd_op_t();
+    op->op_type = OSD_OP_OUT;
+    op->send_list.push_back(op->req.buf, OSD_PACKET_SIZE);
+    op->peer_fd = cl.peer_fd;
+    op->req = {
+        .show_conf = {
+            .header = {
+                .magic = SECONDARY_OSD_OP_MAGIC,
+                .id = this->next_subop_id++,
+                .opcode = OSD_OP_SHOW_CONFIG,
+            },
+        },
+    };
+    op->callback = [this](osd_op_t *op)
+    {
+        osd_client_t & cl = clients[op->peer_fd];
+        std::string json_err;
+        json11::Json config;
+        bool err = false;
+        if (op->reply.hdr.retval < 0)
+        {
+            err = true;
+            printf("Failed to get config from OSD %lu (retval=%ld), disconnecting peer\n", cl.osd_num, op->reply.hdr.retval);
+        }
+        else
+        {
+            config = json11::Json::parse(std::string((char*)op->buf), json_err);
+            if (json_err != "")
+            {
+                err = true;
+                printf("Failed to get config from OSD %lu: bad JSON: %s, disconnecting peer\n", cl.osd_num, json_err.c_str());
+            }
+            else if (config["osd_num"].uint64_value() != cl.osd_num)
+            {
+                err = true;
+                printf("Connected to OSD %lu instead of OSD %lu, peer state is outdated, disconnecting peer\n", config["osd_num"].uint64_value(), cl.osd_num);
+                on_connect_peer(cl.osd_num, -1);
+            }
+        }
+        if (err)
+        {
+            stop_client(op->peer_fd);
+            delete op;
+            return;
+        }
+        osd_peer_fds[cl.osd_num] = cl.peer_fd;
+        on_connect_peer(cl.osd_num, cl.peer_fd);
+        delete op;
+    };
+    outbox_push(op);
+}
+
+void osd_messenger_t::cancel_osd_ops(osd_client_t & cl)
+{
+    for (auto p: cl.sent_ops)
+    {
+        cancel_op(p.second);
+    }
+    cl.sent_ops.clear();
+    for (auto op: cl.outbox)
+    {
+        cancel_op(op);
+    }
+    cl.outbox.clear();
+    if (cl.write_op)
+    {
+        cancel_op(cl.write_op);
+        cl.write_op = NULL;
+    }
+}
+
+void osd_messenger_t::cancel_op(osd_op_t *op)
+{
+    if (op->op_type == OSD_OP_OUT)
+    {
+        op->reply.hdr.magic = SECONDARY_OSD_REPLY_MAGIC;
+        op->reply.hdr.id = op->req.hdr.id;
+        op->reply.hdr.opcode = op->req.hdr.opcode;
+        op->reply.hdr.retval = -EPIPE;
+        // Copy lambda to be unaffected by `delete op`
+        std::function<void(osd_op_t*)>(op->callback)(op);
+    }
+    else
+    {
+        // This function is only called in stop_client(), so it's fine to destroy the operation
+        delete op;
+    }
+}
+
+void osd_messenger_t::stop_client(int peer_fd)
+{
+    assert(peer_fd != 0);
+    auto it = clients.find(peer_fd);
+    if (it == clients.end())
+    {
+        return;
+    }
+    uint64_t repeer_osd = 0;
+    osd_client_t cl = it->second;
+    if (cl.peer_state == PEER_CONNECTED)
+    {
+        if (cl.osd_num)
+        {
+            // Reload configuration from etcd when the connection is dropped
+            printf("[OSD %lu] Stopping client %d (OSD peer %lu)\n", osd_num, peer_fd, cl.osd_num);
+            repeer_osd = cl.osd_num;
+        }
+        else
+        {
+            printf("[OSD %lu] Stopping client %d (regular client)\n", osd_num, peer_fd);
+        }
+    }
+    clients.erase(it);
+    tfd->set_fd_handler(peer_fd, NULL);
+    if (cl.osd_num)
+    {
+        osd_peer_fds.erase(cl.osd_num);
+        // Cancel outbound operations
+        cancel_osd_ops(cl);
+    }
+    if (cl.read_op)
+    {
+        delete cl.read_op;
+        cl.read_op = NULL;
+    }
+    for (auto rit = read_ready_clients.begin(); rit != read_ready_clients.end(); rit++)
+    {
+        if (*rit == peer_fd)
+        {
+            read_ready_clients.erase(rit);
+            break;
+        }
+    }
+    for (auto wit = write_ready_clients.begin(); wit != write_ready_clients.end(); wit++)
+    {
+        if (*wit == peer_fd)
+        {
+            write_ready_clients.erase(wit);
+            break;
+        }
+    }
+    free(cl.in_buf);
+    close(peer_fd);
+    if (repeer_osd)
+    {
+        repeer_pgs(repeer_osd);
+    }
+}
+
+void osd_messenger_t::accept_connections(int listen_fd)
+{
+    // Accept new connections
+    sockaddr_in addr;
+    socklen_t peer_addr_size = sizeof(addr);
+    int peer_fd;
+    while ((peer_fd = accept(listen_fd, (sockaddr*)&addr, &peer_addr_size)) >= 0)
+    {
+        assert(peer_fd != 0);
+        char peer_str[256];
+        printf("[OSD %lu] new client %d: connection from %s port %d\n", this->osd_num, peer_fd,
+            inet_ntop(AF_INET, &addr.sin_addr, peer_str, 256), ntohs(addr.sin_port));
+        fcntl(peer_fd, F_SETFL, fcntl(peer_fd, F_GETFL, 0) | O_NONBLOCK);
+        int one = 1;
+        setsockopt(peer_fd, SOL_TCP, TCP_NODELAY, &one, sizeof(one));
+        clients[peer_fd] = {
+            .peer_addr = addr,
+            .peer_port = ntohs(addr.sin_port),
+            .peer_fd = peer_fd,
+            .peer_state = PEER_CONNECTED,
+            .in_buf = malloc(receive_buffer_size),
+        };
+        // Add FD to epoll
+        tfd->set_fd_handler(peer_fd, [this](int peer_fd, int epoll_events)
+        {
+            handle_peer_epoll(peer_fd, epoll_events);
+        });
+        // Try to accept next connection
+        peer_addr_size = sizeof(addr);
+    }
+    if (peer_fd == -1 && errno != EAGAIN)
+    {
+        throw std::runtime_error(std::string("accept: ") + strerror(errno));
+    }
+}

messenger.h

@@ -0,0 +1,213 @@
+#pragma once
+
+#include <sys/types.h>
+#include <stdint.h>
+#include <arpa/inet.h>
+#include <malloc.h>
+
+#include <set>
+#include <map>
+#include <deque>
+#include <vector>
+
+#include "json11/json11.hpp"
+#include "osd_ops.h"
+#include "timerfd_manager.h"
+#include "ringloop.h"
+
+#define OSD_OP_IN 0
+#define OSD_OP_OUT 1
+
+#define CL_READ_HDR 1
+#define CL_READ_DATA 2
+#define CL_READ_REPLY_DATA 3
+#define CL_WRITE_READY 1
+#define CL_WRITE_REPLY 2
+#define OSD_OP_INLINE_BUF_COUNT 16
+
+#define PEER_CONNECTING 1
+#define PEER_CONNECTED 2
+
+#define DEFAULT_PEER_CONNECT_INTERVAL 5
+#define DEFAULT_PEER_CONNECT_TIMEOUT 5
+
+struct osd_op_buf_list_t
+{
+    int count = 0, alloc = 0, sent = 0;
+    iovec *buf = NULL;
+    iovec inline_buf[OSD_OP_INLINE_BUF_COUNT];
+
+    ~osd_op_buf_list_t()
+    {
+        if (buf && buf != inline_buf)
+        {
+            free(buf);
+        }
+    }
+
+    inline iovec* get_iovec()
+    {
+        return (buf ? buf : inline_buf) + sent;
+    }
+
+    inline int get_size()
+    {
+        return count - sent;
+    }
+
+    inline void push_back(void *nbuf, size_t len)
+    {
+        if (count >= alloc)
+        {
+            if (!alloc)
+            {
+                alloc = OSD_OP_INLINE_BUF_COUNT;
+                buf = inline_buf;
+            }
+            else if (buf == inline_buf)
+            {
+                int old = alloc;
+                alloc = ((alloc/16)*16 + 1);
+                buf = (iovec*)malloc(sizeof(iovec) * alloc);
+                memcpy(buf, inline_buf, sizeof(iovec)*old);
+            }
+            else
+            {
+                alloc = ((alloc/16)*16 + 1);
+                buf = (iovec*)realloc(buf, sizeof(iovec) * alloc);
+            }
+        }
+        buf[count++] = { .iov_base = nbuf, .iov_len = len };
+    }
+};
+
+struct blockstore_op_t;
+
+struct osd_primary_op_data_t;
+
+struct osd_op_t
+{
+    timespec tv_begin;
+    uint64_t op_type = OSD_OP_IN;
+    int peer_fd;
+    osd_any_op_t req;
+    osd_any_reply_t reply;
+    blockstore_op_t *bs_op = NULL;
+    void *buf = NULL;
+    void *rmw_buf = NULL;
+    osd_primary_op_data_t* op_data = NULL;
+    std::function<void(osd_op_t*)> callback;
+
+    osd_op_buf_list_t send_list;
+
+    ~osd_op_t();
+};
+
+struct osd_client_t
+{
+    sockaddr_in peer_addr;
+    int peer_port;
+    int peer_fd;
+    int peer_state;
+    int connect_timeout_id = -1;
+    osd_num_t osd_num = 0;
+
+    void *in_buf = NULL;
+
+    // Read state
+    int read_ready = 0;
+    osd_op_t *read_op = NULL;
+    int read_reply_id = 0;
+    iovec read_iov;
+    msghdr read_msg;
+    void *read_buf = NULL;
+    int read_remaining = 0;
+    int read_state = 0;
+
+    // Incoming operations
+    std::vector<osd_op_t*> received_ops;
+
+    // Outbound operations
+    std::deque<osd_op_t*> outbox;
+    std::map<int, osd_op_t*> sent_ops;
+
+    // PGs dirtied by this client's primary-writes (FIXME to drop the connection)
+    std::set<pg_num_t> dirty_pgs;
+
+    // Write state
+    osd_op_t *write_op = NULL;
+    msghdr write_msg;
+    int write_state = 0;
+};
+
+struct osd_wanted_peer_t
+{
+    json11::Json address_list;
+    int port;
+    time_t last_connect_attempt;
+    bool connecting, address_changed;
+    int address_index;
+    std::string cur_addr;
+    int cur_port;
+};
+
+struct osd_op_stats_t
+{
+    uint64_t op_stat_sum[OSD_OP_MAX+1] = { 0 };
+    uint64_t op_stat_count[OSD_OP_MAX+1] = { 0 };
+    uint64_t op_stat_bytes[OSD_OP_MAX+1] = { 0 };
+    uint64_t subop_stat_sum[OSD_OP_MAX+1] = { 0 };
+    uint64_t subop_stat_count[OSD_OP_MAX+1] = { 0 };
+};
+
+struct osd_messenger_t
+{
+    timerfd_manager_t *tfd;
+    ring_loop_t *ringloop;
+
+    // osd_num_t is only for logging and asserts
+    osd_num_t osd_num;
+    int receive_buffer_size = 9000;
+    int peer_connect_interval = DEFAULT_PEER_CONNECT_INTERVAL;
+    int peer_connect_timeout = DEFAULT_PEER_CONNECT_TIMEOUT;
+    int log_level = 0;
+
+    std::map<osd_num_t, osd_wanted_peer_t> wanted_peers;
+    std::map<uint64_t, int> osd_peer_fds;
+    uint64_t next_subop_id = 1;
+
+    std::map<int, osd_client_t> clients;
+    std::vector<int> read_ready_clients;
+    std::vector<int> write_ready_clients;
+
+    // op statistics
+    osd_op_stats_t stats;
+
+public:
+    void connect_peer(uint64_t osd_num, json11::Json peer_state);
+    void stop_client(int peer_fd);
+    void outbox_push(osd_op_t *cur_op);
+    std::function<void(osd_op_t*)> exec_op;
+    std::function<void(osd_num_t)> repeer_pgs;
+    void handle_peer_epoll(int peer_fd, int epoll_events);
+    void read_requests();
+    void send_replies();
+    void accept_connections(int listen_fd);
+
+protected:
+    void try_connect_peer(uint64_t osd_num);
+    void try_connect_peer_addr(osd_num_t peer_osd, const char *peer_host, int peer_port);
+    void handle_connect_epoll(int peer_fd);
+    void on_connect_peer(osd_num_t peer_osd, int peer_fd);
+    void check_peer_config(osd_client_t & cl);
+    void cancel_osd_ops(osd_client_t & cl);
+    void cancel_op(osd_op_t *op);
+
+    bool try_send(osd_client_t & cl);
+    void handle_send(int result, int peer_fd);
+
+    bool handle_read(int result, int peer_fd);
+    void handle_finished_read(osd_client_t & cl);
+    void handle_op_hdr(osd_client_t *cl);
+    void handle_reply_hdr(osd_client_t *cl);
+};

mon/PGUtil.js

@@ -1,104 +0,0 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 (see README.md for details)
-
-module.exports = {
-    scale_pg_count,
-};
-
-function add_pg_history(new_pg_history, new_pg, prev_pgs, prev_pg_history, old_pg)
-{
-    if (!new_pg_history[new_pg])
-    {
-        new_pg_history[new_pg] = {
-            osd_sets: {},
-            all_peers: {},
-            epoch: 0,
-        };
-    }
-    const nh = new_pg_history[new_pg], oh = prev_pg_history[old_pg];
-    nh.osd_sets[prev_pgs[old_pg].join(' ')] = prev_pgs[old_pg];
-    if (oh && oh.osd_sets && oh.osd_sets.length)
-    {
-        for (const pg of oh.osd_sets)
-        {
-            nh.osd_sets[pg.join(' ')] = pg;
-        }
-    }
-    if (oh && oh.all_peers && oh.all_peers.length)
-    {
-        for (const osd_num of oh.all_peers)
-        {
-            nh.all_peers[osd_num] = Number(osd_num);
-        }
-    }
-    if (oh && oh.epoch)
-    {
-        nh.epoch = nh.epoch < oh.epoch ? oh.epoch : nh.epoch;
-    }
-}
-
-function finish_pg_history(merged_history)
-{
-    merged_history.osd_sets = Object.values(merged_history.osd_sets);
-    merged_history.all_peers = Object.values(merged_history.all_peers);
-}
-
-function scale_pg_count(prev_pgs, prev_pg_history, new_pg_history, new_pg_count)
-{
-    const old_pg_count = prev_pgs.length;
-    // Add all possibly intersecting PGs to the history of new PGs
-    if (!(new_pg_count % old_pg_count))
-    {
-        // New PG count is a multiple of old PG count
-        for (let i = 0; i < new_pg_count; i++)
-        {
-            add_pg_history(new_pg_history, i, prev_pgs, prev_pg_history, i % old_pg_count);
-            finish_pg_history(new_pg_history[i]);
-        }
-    }
-    else if (!(old_pg_count % new_pg_count))
-    {
-        // Old PG count is a multiple of the new PG count
-        const mul = (old_pg_count / new_pg_count);
-        for (let i = 0; i < new_pg_count; i++)
-        {
-            for (let j = 0; j < mul; j++)
-            {
-                add_pg_history(new_pg_history, i, prev_pgs, prev_pg_history, i+j*new_pg_count);
-            }
-            finish_pg_history(new_pg_history[i]);
-        }
-    }
-    else
-    {
-        // Any PG may intersect with any PG after non-multiple PG count change
-        // So, merge ALL PGs history
-        let merged_history = {};
-        for (let i = 0; i < old_pg_count; i++)
-        {
-            add_pg_history(merged_history, 1, prev_pgs, prev_pg_history, i);
-        }
-        finish_pg_history(merged_history[1]);
-        for (let i = 0; i < new_pg_count; i++)
-        {
-            new_pg_history[i] = { ...merged_history[1] };
-        }
-    }
-    // Mark history keys for removed PGs as removed
-    for (let i = new_pg_count; i < old_pg_count; i++)
-    {
-        new_pg_history[i] = null;
-    }
-    // Just for the lp_solve optimizer - pick a "previous" PG for each "new" one
-    if (old_pg_count < new_pg_count)
-    {
-        for (let i = old_pg_count; i < new_pg_count; i++)
-        {
-            prev_pgs[i] = prev_pgs[i % old_pg_count];
-        }
-    }
-    else if (old_pg_count > new_pg_count)
-    {
-        prev_pgs.splice(new_pg_count, old_pg_count-new_pg_count);
-    }
-}

mon/afr.js

@@ -1,89 +0,0 @@
-// Functions to calculate Annualized Failure Rate of your cluster
-// if you know AFR of your drives, number of drives, expected rebalance time
-// and replication factor
-// License: VNPL-1.1 (see https://yourcmc.ru/git/vitalif/vitastor/src/branch/master/README.md for details) or AGPL-3.0
-// Author: Vitaliy Filippov, 2020+
-
-module.exports = {
-    cluster_afr_fullmesh,
-    failure_rate_fullmesh,
-    cluster_afr,
-    c_n_k,
-};
-
-/******** "FULL MESH": ASSUME EACH OSD COMMUNICATES WITH ALL OTHER OSDS ********/
-
-// Estimate AFR of the cluster
-// n - number of drives
-// afr - annualized failure rate of a single drive
-// l - expected rebalance time in days after a single drive failure
-// k - replication factor / number of drives that must fail at the same time for the cluster to fail
-function cluster_afr_fullmesh(n, afr, l, k)
-{
-    return 1 - (1 - afr * failure_rate_fullmesh(n-(k-1), afr*l/365, k-1)) ** (n-(k-1));
-}
-
-// Probability of at least <f> failures in a cluster with <n> drives with AFR=<a>
-function failure_rate_fullmesh(n, a, f)
-{
-    if (f <= 0)
-    {
-        return (1-a)**n;
-    }
-    let p = 1;
-    for (let i = 0; i < f; i++)
-    {
-        p -= c_n_k(n, i) * (1-a)**(n-i) * a**i;
-    }
-    return p;
-}
-
-/******** PGS: EACH OSD ONLY COMMUNICATES WITH <pgs> OTHER OSDs ********/
-
-// <n> hosts of <m> drives of <capacity> GB, each able to backfill at <speed> GB/s,
-// <k> replicas, <pgs> unique peer PGs per OSD (~50 for 100 PG-per-OSD in a big cluster)
-//
-// For each of n*m drives: P(drive fails in a year) * P(any of its peers fail in <l*365> next days).
-// More peers per OSD increase rebalance speed (more drives work together to resilver) if you
-// let them finish rebalance BEFORE replacing the failed drive (degraded_replacement=false).
-// At the same time, more peers per OSD increase probability of any of them to fail!
-// osd_rm=true means that failed OSDs' data is rebalanced over all other hosts,
-// not over the same host as it's in Ceph by default (dead OSDs are marked 'out').
-//
-// Probability of all except one drives in a replica group to fail is (AFR^(k-1)).
-// So with <x> PGs it becomes ~ (x * (AFR*L/365)^(k-1)). Interesting but reasonable consequence
-// is that, with k=2, total failure rate doesn't depend on number of peers per OSD,
-// because it gets increased linearly by increased number of peers to fail
-// and decreased linearly by reduced rebalance time.
-function cluster_afr({ n_hosts, n_drives, afr_drive, afr_host, capacity, speed, ec, ec_data, ec_parity, replicas, pgs = 1, osd_rm, degraded_replacement, down_out_interval = 600 })
-{
-    const pg_size = (ec ? ec_data+ec_parity : replicas);
-    pgs = Math.min(pgs, (n_hosts-1)*n_drives/(pg_size-1));
-    const host_pgs = Math.min(pgs*n_drives, (n_hosts-1)*n_drives/(pg_size-1));
-    const resilver_disk = n_drives == 1 || osd_rm ? pgs : (n_drives-1);
-    const disk_heal_time = (down_out_interval + capacity/(degraded_replacement ? 1 : resilver_disk)/speed)/86400/365;
-    const host_heal_time = (down_out_interval + n_drives*capacity/pgs/speed)/86400/365;
-    const disk_heal_fail = ((afr_drive+afr_host/n_drives)*disk_heal_time);
-    const host_heal_fail = ((afr_drive+afr_host/n_drives)*host_heal_time);
-    const disk_pg_fail = ec
-        ? failure_rate_fullmesh(ec_data+ec_parity-1, disk_heal_fail, ec_parity)
-        : disk_heal_fail**(replicas-1);
-    const host_pg_fail = ec
-        ? failure_rate_fullmesh(ec_data+ec_parity-1, host_heal_fail, ec_parity)
-        : host_heal_fail**(replicas-1);
-    return 1 - ((1 - afr_drive * (1-(1-disk_pg_fail)**pgs)) ** (n_hosts*n_drives))
-        * ((1 - afr_host * (1-(1-host_pg_fail)**host_pgs)) ** n_hosts);
-}
-
-/******** UTILITY ********/
-
-// Combination count
-function c_n_k(n, k)
-{
-    let r = 1;
-    for (let i = 0; i < k; i++)
-    {
-        r *= (n-i) / (i+1);
-    }
-    return r;
-}

mon/afr_test.js

@@ -1,28 +0,0 @@
-const { sprintf } = require('sprintf-js');
-const { cluster_afr } = require('./afr.js');
-
-print_cluster_afr({ n_hosts: 4, n_drives: 6, afr_drive: 0.03, afr_host: 0.05, capacity: 4000, speed: 0.1, replicas: 2 });
-print_cluster_afr({ n_hosts: 4, n_drives: 3, afr_drive: 0.03, afr_host: 0, capacity: 4000, speed: 0.1, replicas: 2 });
-print_cluster_afr({ n_hosts: 4, n_drives: 3, afr_drive: 0.03, afr_host: 0.05, capacity: 4000, speed: 0.1, replicas: 2 });
-print_cluster_afr({ n_hosts: 4, n_drives: 3, afr_drive: 0.03, afr_host: 0, capacity: 4000, speed: 0.1, ec: true, ec_data: 2, ec_parity: 1 });
-print_cluster_afr({ n_hosts: 4, n_drives: 3, afr_drive: 0.03, afr_host: 0.05, capacity: 4000, speed: 0.1, ec: true, ec_data: 2, ec_parity: 1 });
-print_cluster_afr({ n_hosts: 10, n_drives: 10, afr_drive: 0.1, afr_host: 0, capacity: 8000, speed: 0.02, replicas: 2 });
-print_cluster_afr({ n_hosts: 10, n_drives: 10, afr_drive: 0.1, afr_host: 0.05, capacity: 8000, speed: 0.02, replicas: 2 });
-print_cluster_afr({ n_hosts: 10, n_drives: 10, afr_drive: 0.1, afr_host: 0, capacity: 8000, speed: 0.02, replicas: 3 });
-print_cluster_afr({ n_hosts: 10, n_drives: 10, afr_drive: 0.1, afr_host: 0.05, capacity: 8000, speed: 0.02, replicas: 3 });
-print_cluster_afr({ n_hosts: 10, n_drives: 10, afr_drive: 0.1, afr_host: 0, capacity: 8000, speed: 0.02, replicas: 3, pgs: 100 });
-print_cluster_afr({ n_hosts: 10, n_drives: 10, afr_drive: 0.1, afr_host: 0.05, capacity: 8000, speed: 0.02, replicas: 3, pgs: 100 });
-print_cluster_afr({ n_hosts: 10, n_drives: 10, afr_drive: 0.1, afr_host: 0.05, capacity: 8000, speed: 0.02, replicas: 3, pgs: 100, degraded_replacement: 1 });
-
-function print_cluster_afr(config)
-{
-    console.log(
-        `${config.n_hosts} nodes with ${config.n_drives} ${sprintf("%.1f", config.capacity/1000)}TB drives`+
-        `, capable to backfill at ${sprintf("%.1f", config.speed*1000)} MB/s, drive AFR ${sprintf("%.1f", config.afr_drive*100)}%`+
-        (config.afr_host ? `, host AFR ${sprintf("%.1f", config.afr_host*100)}%` : '')+
-        (config.ec ? `, EC ${config.ec_data}+${config.ec_parity}` : `, ${config.replicas} replicas`)+
-        `, ${config.pgs||1} PG per OSD`+
-        (config.degraded_replacement ? `\n...and you don't let the rebalance finish before replacing drives` : '')
-    );
-    console.log('-> '+sprintf("%.7f%%", 100*cluster_afr(config))+'\n');
-}

mon/make-osd.sh

@@ -1,75 +0,0 @@
-#!/bin/bash
-# Very simple systemd unit generator for vitastor-osd services
-# Not the final solution yet, mostly for tests
-# Copyright (c) Vitaliy Filippov, 2019+
-# License: MIT
-
-# USAGE: ./make-osd.sh /dev/disk/by-partuuid/xxx [ /dev/disk/by-partuuid/yyy]...
-
-IP_SUBSTR="10.200.1."
-ETCD_HOSTS="etcd0=http://10.200.1.10:2380,etcd1=http://10.200.1.11:2380,etcd2=http://10.200.1.12:2380"
-
-set -e -x
-
-IP=`ip -json a s | jq -r '.[].addr_info[] | select(.local | startswith("'$IP_SUBSTR'")) | .local'`
-[ "$IP" != "" ] || exit 1
-ETCD_MON=$(echo $ETCD_HOSTS | perl -pe 's/:2380/:2379/g; s/etcd\d*=//g;')
-D=`dirname $0`
-
-# Create OSDs on all passed devices
-OSD_NUM=1
-for DEV in $*; do
-
-# Ugly :) -> node.js rework pending
-while true; do
-    ST=$(etcdctl --endpoints="$ETCD_MON" get --print-value-only /vitastor/osd/stats/$OSD_NUM)
-    if [ "$ST" = "" ]; then
-        break
-    fi
-    OSD_NUM=$((OSD_NUM+1))
-done
-etcdctl --endpoints="$ETCD_MON" put /vitastor/osd/stats/$OSD_NUM '{}'
-
-echo Creating OSD $OSD_NUM on $DEV
-
-OPT=`node $D/simple-offsets.js --device $DEV --format options | tr '\n' ' '`
-META=`echo $OPT | grep -Po '(?<=data_offset )\d+'`
-dd if=/dev/zero of=$DEV bs=1048576 count=$(((META+1048575)/1048576)) oflag=direct
-
-cat >/etc/systemd/system/vitastor-osd$OSD_NUM.service <<EOF
-[Unit]
-Description=Vitastor object storage daemon osd.$OSD_NUM
-After=network-online.target local-fs.target time-sync.target
-Wants=network-online.target local-fs.target time-sync.target
-PartOf=vitastor.target
-
-[Service]
-LimitNOFILE=1048576
-LimitNPROC=1048576
-LimitMEMLOCK=infinity
-ExecStart=/usr/bin/vitastor-osd \\
-    --etcd_address $IP:2379/v3 \\
-    --bind_address $IP \\
-    --osd_num $OSD_NUM \\
-    --disable_data_fsync 1 \\
-    --immediate_commit all \\
-    --disk_alignment 4096 --journal_block_size 4096 --meta_block_size 4096 \\
-    --journal_no_same_sector_overwrites true \\
-    --journal_sector_buffer_count 1024 \\
-    $OPT
-WorkingDirectory=/
-ExecStartPre=+chown vitastor:vitastor $DEV
-User=vitastor
-PrivateTmp=false
-TasksMax=infinity
-Restart=always
-StartLimitInterval=0
-RestartSec=10
-
-[Install]
-WantedBy=vitastor.target
-EOF
-
-systemctl enable vitastor-osd$OSD_NUM
-
-done

mon/make-units.sh

@@ -1,86 +0,0 @@
-#!/bin/bash
-# Very simple systemd unit generator for etcd & vitastor-mon services
-# Not the final solution yet, mostly for tests
-# Copyright (c) Vitaliy Filippov, 2019+
-# License: MIT
-
-# USAGE: ./make-units.sh
-
-IP_SUBSTR="10.200.1."
-ETCD_HOSTS="etcd0=http://10.200.1.10:2380,etcd1=http://10.200.1.11:2380,etcd2=http://10.200.1.12:2380"
-
-# determine IP
-IP=`ip -json a s | jq -r '.[].addr_info[] | select(.local | startswith("'$IP_SUBSTR'")) | .local'`
-[ "$IP" != "" ] || exit 1
-ETCD_NUM=${ETCD_HOSTS/$IP*/}
-[ "$ETCD_NUM" != "$ETCD_HOSTS" ] || exit 1
-ETCD_NUM=$(echo $ETCD_NUM | tr -d -c , | wc -c)
-
-# etcd
-useradd etcd
-
-mkdir -p /var/lib/etcd$ETCD_NUM.etcd
-cat >/etc/systemd/system/etcd.service <<EOF
-[Unit]
-Description=etcd for vitastor
-After=network-online.target local-fs.target time-sync.target
-Wants=network-online.target local-fs.target time-sync.target
-
-[Service]
-Restart=always
-ExecStart=/usr/local/bin/etcd -name etcd$ETCD_NUM --data-dir /var/lib/etcd$ETCD_NUM.etcd \\
-    --advertise-client-urls http://$IP:2379 --listen-client-urls http://$IP:2379 \\
-    --initial-advertise-peer-urls http://$IP:2380 --listen-peer-urls http://$IP:2380 \\
-    --initial-cluster-token vitastor-etcd-1 --initial-cluster $ETCD_HOSTS \\
-    --initial-cluster-state new --max-txn-ops=100000 --max-request-bytes=104857600 \\
-    --auto-compaction-retention=10 --auto-compaction-mode=revision
-WorkingDirectory=/var/lib/etcd$ETCD_NUM.etcd
-ExecStartPre=+chown -R etcd /var/lib/etcd$ETCD_NUM.etcd
-User=etcd
-PrivateTmp=false
-TasksMax=infinity
-Restart=always
-StartLimitInterval=0
-RestartSec=10
-
-[Install]
-WantedBy=local.target
-EOF
-
-systemctl daemon-reload
-systemctl enable etcd
-systemctl start etcd
-
-useradd vitastor
-chmod 755 /root
-
-# Vitastor target
-cat >/etc/systemd/system/vitastor.target <<EOF
-[Unit]
-Description=vitastor target
-[Install]
-WantedBy=multi-user.target
-EOF
-
-# Monitor unit
-ETCD_MON=$(echo $ETCD_HOSTS | perl -pe 's/:2380/:2379/g; s/etcd\d*=//g;')
-cat >/etc/systemd/system/vitastor-mon.service <<EOF
-[Unit]
-Description=Vitastor monitor
-After=network-online.target local-fs.target time-sync.target
-Wants=network-online.target local-fs.target time-sync.target
-
-[Service]
-Restart=always
-ExecStart=node /usr/lib/vitastor/mon/mon-main.js --etcd_url '$ETCD_MON' --etcd_prefix '/vitastor' --etcd_start_timeout 5
-WorkingDirectory=/
-User=vitastor
-PrivateTmp=false
-TasksMax=infinity
-Restart=always
-StartLimitInterval=0
-RestartSec=10
-
-[Install]
-WantedBy=vitastor.target
-EOF

mon/merge.js

@@ -1,23 +0,0 @@
-const fsp = require('fs').promises;
-
-async function merge(file1, file2, out)
-{
-    if (!out)
-    {
-        console.error('USAGE: nodejs merge.js layer1 layer2 output');
-        process.exit();
-    }
-    const layer1 = await fsp.readFile(file1);
-    const layer2 = await fsp.readFile(file2);
-    const zero = Buffer.alloc(4096);
-    for (let i = 0; i < layer2.length; i += 4096)
-    {
-        if (zero.compare(layer2, i, i+4096) != 0)
-        {
-            layer2.copy(layer1, i, i, i+4096);
-        }
-    }
-    await fsp.writeFile(out, layer1);
-}
-
-merge(process.argv[2], process.argv[3], process.argv[4]);

mon/simple-offsets.js

@@ -1,96 +0,0 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: MIT
-
-// Simple tool to calculate journal and metadata offsets for a single device
-// Will be replaced by smarter tools in the future
-
-const fs = require('fs').promises;
-const child_process = require('child_process');
-
-async function run()
-{
-    const options = {
-        object_size: 128*1024,
-        bitmap_granularity: 4096,
-        journal_size: 16*1024*1024,
-        device_block_size: 4096,
-        journal_offset: 0,
-        device_size: 0,
-        format: 'text',
-    };
-    for (let i = 2; i < process.argv.length; i++)
-    {
-        if (process.argv[i].substr(0, 2) == '--')
-        {
-            options[process.argv[i].substr(2)] = process.argv[i+1];
-            i++;
-        }
-    }
-    if (!options.device)
-    {
-        process.stderr.write('USAGE: nodejs '+process.argv[1]+' --device /dev/sdXXX\n');
-        process.exit(1);
-    }
-    options.device_size = Number(options.device_size);
-    let device_size = options.device_size;
-    if (!device_size)
-    {
-        const st = await fs.stat(options.device);
-        options.device_block_size = st.blksize;
-        if (st.isBlockDevice())
-            device_size = Number(await system("/sbin/blockdev --getsize64 "+options.device))
-        else
-            device_size = st.size;
-    }
-    if (!device_size)
-    {
-        process.stderr.write('Failed to get device size\n');
-        process.exit(1);
-    }
-    options.journal_offset = Math.ceil(options.journal_offset/options.device_block_size)*options.device_block_size;
-    const meta_offset = options.journal_offset + Math.ceil(options.journal_size/options.device_block_size)*options.device_block_size;
-    const entries_per_block = Math.floor(options.device_block_size / (24 + 2*options.object_size/options.bitmap_granularity/8));
-    const object_count = Math.floor((device_size-meta_offset)/options.object_size);
-    const meta_size = Math.ceil(1 + object_count / entries_per_block) * options.device_block_size;
-    const data_offset = meta_offset + meta_size;
-    const meta_size_fmt = (meta_size > 1024*1024*1024 ? Math.round(meta_size/1024/1024/1024*100)/100+" GB"
-        : Math.round(meta_size/1024/1024*100)/100+" MB");
-    if (options.format == 'text' || options.format == 'options')
-    {
-        if (options.format == 'text')
-        {
-            process.stderr.write(
-                `Metadata size: ${meta_size_fmt}\n`+
-                `Options for the OSD:\n`
-            );
-        }
-        process.stdout.write(
-            (options.device_block_size != 4096 ?
-                `    --meta_block_size ${options.device}\n`+
-                `    --journal_block-size ${options.device}\n` : '')+
-            `    --data_device ${options.device}\n`+
-            `    --journal_offset ${options.journal_offset}\n`+
-            `    --meta_offset ${meta_offset}\n`+
-            `    --data_offset ${data_offset}\n`+
-            (options.device_size ? `    --data_size ${device_size-data_offset}\n` : '')
-        );
-    }
-    else if (options.format == 'env')
-    {
-        process.stdout.write(
-            `journal_offset=${options.journal_offset}\n`+
-            `meta_offset=${meta_offset}\n`+
-            `data_offset=${data_offset}\n`+
-            `data_size=${device_size-data_offset}\n`
-        );
-    }
-    else
-        process.stdout.write('Unknown format: '+options.format);
-}
-
-function system(cmd)
-{
-    return new Promise((ok, no) => child_process.exec(cmd, { maxBuffer: 64*1024*1024 }, (err, stdout, stderr) => (err ? no(err.message) : ok(stdout))));
-}
-
-run().catch(err => { console.error(err); process.exit(1); });