Test SQ poll threads. Unstable and in fact slower :(

.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 "0.6.17")
-
-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
- of this license document, but changing it is not allowed.
-
-                            Preamble
-
-  The licenses for most software are designed to take away your
-freedom to share and change it.  By contrast, the GNU General Public
-License is intended to guarantee your freedom to share and change free
-software--to make sure the software is free for all its users.  This
-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
-the GNU Lesser General Public License instead.)  You can apply it to
-your programs, too.
-
-  When we speak of free software, we are referring to freedom, not
-price.  Our General Public Licenses are designed to make sure that you
-have the freedom to distribute copies of free software (and charge for
-this service if you wish), that you receive source code or can get it
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-   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
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-    but WITHOUT ANY WARRANTY; without even the implied warranty of
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-Public License instead of this License.

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).

Makefile

@@ -0,0 +1,66 @@
+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 timerfd_interval.o
+# -fsanitize=address
+CXXFLAGS := -g -O3 -Wall -Wno-sign-compare -Wno-comment -Wno-parentheses -Wno-pointer-arith -fPIC -fdiagnostics-color=always
+all: $(BLOCKSTORE_OBJS) libfio_blockstore.so osd libfio_sec_osd.so test_blockstore stub_osd stub_bench osd_test
+clean:
+	rm -f *.o
+
+crc32c.o: crc32c.c
+	g++ $(CXXFLAGS) -c -o $@ $<
+json11.o: json11/json11.cpp
+	g++ $(CXXFLAGS) -c -o json11.o json11/json11.cpp
+allocator.o: allocator.cpp allocator.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+ringloop.o: ringloop.cpp ringloop.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+timerfd_interval.o: timerfd_interval.cpp timerfd_interval.h ringloop.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+
+%.o: %.cpp allocator.h blockstore_flush.h blockstore.h blockstore_impl.h blockstore_init.h blockstore_journal.h crc32c.h ringloop.h timerfd_interval.h object_id.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+
+libblockstore.so: $(BLOCKSTORE_OBJS)
+	g++ $(CXXFLAGS) -o libblockstore.so -shared $(BLOCKSTORE_OBJS) -ltcmalloc_minimal -luring
+libfio_blockstore.so: ./libblockstore.so fio_engine.cpp json11.o
+	g++ $(CXXFLAGS) -shared -o libfio_blockstore.so fio_engine.cpp json11.o ./libblockstore.so -ltcmalloc_minimal -luring
+
+OSD_OBJS := osd.o osd_secondary.o osd_receive.o osd_send.o osd_peering.o osd_peering_pg.o osd_primary.o osd_rmw.o json11.o timerfd_interval.o
+osd_secondary.o: osd_secondary.cpp osd.h osd_ops.h ringloop.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+osd_receive.o: osd_receive.cpp osd.h osd_ops.h ringloop.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+osd_send.o: osd_send.cpp osd.h osd_ops.h ringloop.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+osd_peering.o: osd_peering.cpp osd.h osd_ops.h osd_peering_pg.h ringloop.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+osd_peering_pg.o: osd_peering_pg.cpp object_id.h osd_peering_pg.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+osd_rmw.o: osd_rmw.cpp osd_rmw.h xor.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+osd_rmw_test: osd_rmw_test.cpp osd_rmw.cpp osd_rmw.h xor.h
+	g++ $(CXXFLAGS) -o $@ $<
+osd_primary.o: osd_primary.cpp osd.h osd_ops.h osd_peering_pg.h xor.h ringloop.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+osd.o: osd.cpp osd.h osd_ops.h osd_peering_pg.h ringloop.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+osd: ./libblockstore.so osd_main.cpp osd.h osd_ops.h $(OSD_OBJS)
+	g++ $(CXXFLAGS) -o osd osd_main.cpp $(OSD_OBJS) ./libblockstore.so -ltcmalloc_minimal -luring
+stub_osd: stub_osd.cpp osd_ops.h rw_blocking.o
+	g++ $(CXXFLAGS) -o stub_osd stub_osd.cpp rw_blocking.o -ltcmalloc_minimal
+stub_bench: stub_bench.cpp osd_ops.h rw_blocking.o
+	g++ $(CXXFLAGS) -o stub_bench stub_bench.cpp rw_blocking.o -ltcmalloc_minimal
+rw_blocking.o: rw_blocking.cpp rw_blocking.h
+	g++ $(CXXFLAGS) -c -o $@ $<
+osd_test: osd_test.cpp osd_ops.h rw_blocking.o
+	g++ $(CXXFLAGS) -o osd_test osd_test.cpp rw_blocking.o -ltcmalloc_minimal
+
+libfio_sec_osd.so: fio_sec_osd.cpp osd_ops.h rw_blocking.o
+	g++ $(CXXFLAGS) -ltcmalloc_minimal -shared -o libfio_sec_osd.so fio_sec_osd.cpp rw_blocking.o -luring
+
+test_blockstore: ./libblockstore.so test_blockstore.cpp
+	g++ $(CXXFLAGS) -o test_blockstore test_blockstore.cpp ./libblockstore.so -ltcmalloc_minimal -luring
+test: test.cpp osd_peering_pg.o
+	g++ $(CXXFLAGS) -o test test.cpp osd_peering_pg.o -luring
+test_allocator: test_allocator.cpp allocator.o
+	g++ $(CXXFLAGS) -o test_allocator test_allocator.cpp allocator.o

README-ru.md

@@ -1,100 +0,0 @@
-## Vitastor
-
-[Read English version](README.md)
-
-## Идея
-
-Вернём былую скорость кластерному блочному хранилищу!
-
-Vitastor - распределённая блочная SDS (программная СХД), прямой аналог Ceph RBD и
-внутренних СХД популярных облачных провайдеров. Однако, в отличие от них, Vitastor
-быстрый и при этом простой. Только пока маленький :-).
-
-Vitastor архитектурно похож на Ceph, что означает атомарность и 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.
-
-Vitastor нацелен на SSD и SSD+HDD кластеры с как минимум 10 Гбит/с сетью, поддерживает
-TCP и RDMA и на хорошем железе может достигать задержки 4 КБ чтения и записи на уровне ~0.1 мс,
-что примерно в 10 раз быстрее, чем Ceph и другие популярные программные СХД.
-
-Vitastor поддерживает QEMU-драйвер, протоколы NBD и NFS, драйверы OpenStack, Proxmox, Kubernetes.
-Другие драйверы могут также быть легко реализованы.
-
-Подробности смотрите в документации по ссылкам ниже.
-
-## Презентации и записи докладов
-
-- DevOpsConf'2021: презентация ([на русском](https://vitastor.io/presentation/devopsconf/devopsconf.html),
-  [на английском](https://vitastor.io/presentation/devopsconf/devopsconf_en.html)),
-  [видео](https://vitastor.io/presentation/devopsconf/talk.webm)
-- Highload'2022: презентация ([на русском](https://vitastor.io/presentation/highload/highload.html)),
-  [видео](https://vitastor.io/presentation/highload/talk.webm)
-
-## Документация
-
-- Введение
-  - [Быстрый старт](docs/intro/quickstart.ru.md)
-  - [Возможности](docs/intro/features.ru.md)
-  - [Архитектура](docs/intro/architecture.ru.md)
-  - [Автор и лицензия](docs/intro/author.ru.md)
-- Установка
-  - [Пакеты](docs/installation/packages.ru.md)
-  - [Proxmox](docs/installation/proxmox.ru.md)
-  - [OpenStack](docs/installation/openstack.ru.md)
-  - [Kubernetes CSI](docs/installation/kubernetes.ru.md)
-  - [Сборка из исходных кодов](docs/installation/source.ru.md)
-- Конфигурация
-  - [Обзор](docs/config.ru.md)
-  - Параметры
-    - [Общие](docs/config/common.ru.md)
-    - [Сетевые](docs/config/network.ru.md)
-    - [Глобальные дисковые параметры](docs/config/layout-cluster.ru.md)
-    - [Дисковые параметры OSD](docs/config/layout-osd.ru.md)
-    - [Прочие параметры OSD](docs/config/osd.ru.md)
-    - [Параметры мониторов](docs/config/monitor.ru.md)
-  - [Настройки пулов](docs/config/pool.ru.md)
-  - [Метаданные образов в etcd](docs/config/inode.ru.md)
-- Использование
-  - [vitastor-cli](docs/usage/cli.ru.md) (консольный интерфейс)
-  - [fio](docs/usage/fio.ru.md) для тестов производительности
-  - [NBD](docs/usage/nbd.ru.md) для монтирования ядром
-  - [QEMU и qemu-img](docs/usage/qemu.ru.md)
-  - [NFS](docs/usage/nfs.ru.md)-прокси для VMWare и подобных
-- Производительность
-  - [Понимание сути производительности](docs/performance/understanding.ru.md)
-  - [Теоретический максимум](docs/performance/theoretical.ru.md)
-  - [Пример сравнения с Ceph](docs/performance/comparison1.ru.md)
-
-## 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

@@ -1,100 +0,0 @@
-# Vitastor
-
-[Читать на русском](README-ru.md)
-
-## The Idea
-
-Make Clustered Block Storage Fast Again.
-
-Vitastor is a distributed block SDS, direct replacement of Ceph RBD and internal SDS's
-of public clouds. However, in contrast to them, Vitastor is fast and simple at the same time.
-The only thing is it's slightly young :-).
-
-Vitastor is 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).
-
-Vitastor targets SSD and SSD+HDD clusters with at least 10 Gbit/s network, supports
-TCP and RDMA and may achieve 4 KB read and write latency as low as ~0.1 ms
-with proper hardware which is ~10 times faster than other popular SDS's like Ceph
-or internal systems of public clouds.
-
-Vitastor supports QEMU, NBD, NFS protocols, OpenStack, Proxmox, Kubernetes drivers.
-More drivers may be created easily.
-
-Read more details below in the documentation.
-
-## Talks and presentations
-
-- DevOpsConf'2021: presentation ([in Russian](https://vitastor.io/presentation/devopsconf/devopsconf.html),
-  [in English](https://vitastor.io/presentation/devopsconf/devopsconf_en.html)),
-  [video](https://vitastor.io/presentation/devopsconf/talk.webm)
-- Highload'2022: presentation ([in Russian](https://vitastor.io/presentation/highload/highload.html)),
-  [video](https://vitastor.io/presentation/highload/talk.webm)
-
-## Documentation
-
-- Introduction
-  - [Quick Start](docs/intro/quickstart.en.md)
-  - [Features](docs/intro/features.en.md)
-  - [Architecture](docs/intro/architecture.en.md)
-  - [Author and license](docs/intro/author.en.md)
-- Installation
-  - [Packages](docs/installation/packages.en.md)
-  - [Proxmox](docs/installation/proxmox.en.md)
-  - [OpenStack](docs/installation/openstack.en.md)
-  - [Kubernetes CSI](docs/installation/kubernetes.en.md)
-  - [Building from Source](docs/installation/source.en.md)
-- Configuration
-  - [Overview](docs/config.en.md)
-  - Parameter Reference
-    - [Common](docs/config/common.en.md)
-    - [Network](docs/config/network.en.md)
-    - [Global Disk Layout](docs/config/layout-cluster.en.md)
-    - [OSD Disk Layout](docs/config/layout-osd.en.md)
-    - [OSD Runtime Parameters](docs/config/osd.en.md)
-    - [Monitor](docs/config/monitor.en.md)
-  - [Pool configuration](docs/config/pool.en.md)
-  - [Image metadata in etcd](docs/config/inode.en.md)
-- Usage
-  - [vitastor-cli](docs/usage/cli.en.md) (command-line interface)
-  - [fio](docs/usage/fio.en.md) for benchmarks
-  - [NBD](docs/usage/nbd.en.md) for kernel mounts
-  - [QEMU and qemu-img](docs/usage/qemu.en.md)
-  - [NFS](docs/usage/nfs.en.md) emulator for VMWare and similar
-- Performance
-  - [Understanding storage performance](docs/performance/understanding.en.md)
-  - [Theoretical performance](docs/performance/theoretical.en.md)
-  - [Example comparison with Ceph](docs/performance/comparison1.en.md)
-
-## 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
-
-  0. Definitions.
-
-  "This License" refers to version 1 of the Vitastor Network Public License.
-
-  "Copyright" also means copyright-like laws that apply to other kinds of
-works, such as semiconductor masks.
-
-  "The Program" refers to any copyrightable work licensed under this
-License.  Each licensee is addressed as "you".  "Licensees" and
-"recipients" may be individuals or organizations.
-
-  To "modify" a work means to copy from or adapt all or part of the work
-in a fashion requiring copyright permission, other than the making of an
-exact copy.  The resulting work is called a "modified version" of the
-earlier work or a work "based on" the earlier work.
-
-  A "covered work" means either the unmodified Program or a work based
-on the Program.
-
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-permission, would make you directly or secondarily liable for
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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;
+    uint64_t p2 = 1, total = 1;
-    total = 0;
     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
-        : (((uint64_t)1 << (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)
@@ -79,7 +61,7 @@ void allocator::set(uint64_t addr, bool value)
             }
             if (value)
             {
-                mask[last] = mask[last] | ((uint64_t)1 << bit);
+                mask[last] = mask[last] | (1l << bit);
                 if (mask[last] != (!is_last || cur_addr/64 < size/64
                     ? UINT64_MAX : last_one_mask))
                 {
@@ -88,7 +70,7 @@ void allocator::set(uint64_t addr, bool value)
             }
             else
             {
-                mask[last] = mask[last] & ~((uint64_t)1 << bit);
+                mask[last] = mask[last] & ~(1l << bit);
             }
             is_last = false;
             if (p2 > 1)
@@ -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);

blockstore.cpp

@@ -0,0 +1,61 @@
+#include "blockstore_impl.h"
+
+blockstore_t::blockstore_t(blockstore_config_t & config, ring_loop_t *ringloop)
+{
+    impl = new blockstore_impl_t(config, ringloop);
+}
+
+blockstore_t::~blockstore_t()
+{
+    delete impl;
+}
+
+void blockstore_t::loop()
+{
+    impl->loop();
+}
+
+bool blockstore_t::is_started()
+{
+    return impl->is_started();
+}
+
+bool blockstore_t::is_stalled()
+{
+    return impl->is_stalled();
+}
+
+bool blockstore_t::is_safe_to_stop()
+{
+    return impl->is_safe_to_stop();
+}
+
+void blockstore_t::enqueue_op(blockstore_op_t *op)
+{
+    impl->enqueue_op(op, false);
+}
+
+void blockstore_t::enqueue_op_first(blockstore_op_t *op)
+{
+    impl->enqueue_op(op, true);
+}
+
+std::unordered_map<object_id, uint64_t> & blockstore_t::get_unstable_writes()
+{
+    return impl->unstable_writes;
+}
+
+uint32_t blockstore_t::get_block_size()
+{
+    return impl->get_block_size();
+}
+
+uint64_t blockstore_t::get_block_count()
+{
+    return impl->get_block_count();
+}
+
+uint32_t blockstore_t::get_disk_alignment()
+{
+    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
@@ -9,38 +6,32 @@
 
 #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
-#ifndef MEM_ALIGNMENT
+#define MEM_ALIGNMENT 512
-#define MEM_ALIGNMENT 4096
-#endif
 
 // Default block size is 128 KB, current allowed range is 4K - 128M
 #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 3
-#define BS_OP_SYNC 4
+#define BS_OP_STABLE 4
-#define BS_OP_STABLE 5
+#define BS_OP_DELETE 5
-#define BS_OP_DELETE 6
+#define BS_OP_LIST 6
-#define BS_OP_LIST 7
+#define BS_OP_ROLLBACK 7
-#define BS_OP_ROLLBACK 8
+#define BS_OP_SYNC_STAB_ALL 8
-#define BS_OP_SYNC_STAB_ALL 9
+#define BS_OP_MAX 8
-#define BS_OP_MAX 9
 
 #define BS_OP_PRIVATE_DATA_SIZE 256
 
@@ -48,9 +39,9 @@
 
 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
@@ -59,15 +50,12 @@ Input:
   - version == 0: read the last stable version,
   - version == UINT64_MAX: read the last version,
   - otherwise: read the newest version that is <= the specified version
-  - reads aren't guaranteed to return data from previous unfinished writes
   For writes:
   - if version == 0, a new version is assigned automatically
   - if version != 0, it is assigned for the new write if possible, otherwise -EINVAL is returned
 - 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)
@@ -104,7 +92,7 @@ Input:
 - buf = pre-allocated obj_ver_id array <len> units long
 
 Output:
-- retval = 0 or negative error number (-EINVAL, -ENOENT if no such version or -EBUSY if not synced)
+- retval = 0 or negative error number (-EINVAL)
 
 ## BS_OP_SYNC_STAB_ALL
 
@@ -122,8 +110,6 @@ 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 +131,6 @@ 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 +144,7 @@ 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
@@ -180,21 +165,16 @@ public:
     // Submission
     void enqueue_op(blockstore_op_t *op);
 
-    // Simplified synchronous operation: get object bitmap & current version
+    // Insert operation into the beginning of the queue
-    int read_bitmap(object_id oid, uint64_t target_version, void *bitmap, uint64_t *result_version = NULL);
+    // 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
+    // Unstable writes are added here (map of object_id -> version)
-    std::map<uint64_t, uint64_t> & get_inode_space_stats();
+    std::unordered_map<object_id, uint64_t> & get_unstable_writes();
-
-    // Print diagnostics to stdout
-    void dump_diagnostics();
 
     // FIXME rename to object_size
     uint32_t get_block_size();
     uint64_t get_block_count();
-    uint64_t get_free_block_count();
 
-    uint64_t get_journal_size();
+    uint32_t get_disk_alignment();
-
-    uint32_t get_bitmap_granularity();
 };

blockstore_flush.cpp

@@ -1,27 +1,16 @@
-// 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->flusher_count = 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;
-    dequeuing = false;
-    trimming = false;
     active_flushers = 0;
-    syncing_flushers = 0;
+    sync_threshold = flusher_count == 1 ? 1 : flusher_count/2;
-    // FIXME: allow to configure flusher_start_threshold and journal_trim_interval
+    journal_trim_interval = sync_threshold;
-    flusher_start_threshold = bs->journal_block_size / sizeof(journal_entry_stable);
+    journal_trim_counter = 0;
-    journal_trim_interval = 512;
+    journal_superblock = bs->journal.inmemory ? bs->journal.buffer : memalign(MEM_ALIGNMENT, bs->journal_block_size);
-    journal_trim_counter = bs->journal.flush_journal ? 1 : 0;
+    co = new journal_flusher_co[flusher_count];
-    trim_wanted = bs->journal.flush_journal ? 1 : 0;
+    for (int i = 0; i < flusher_count; i++)
-    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++)
     {
         co[i].bs = bs;
         co[i].flusher = this;
@@ -66,36 +55,23 @@ journal_flusher_t::~journal_flusher_t()
 
 bool journal_flusher_t::is_active()
 {
-    return active_flushers > 0 || dequeuing;
+    return active_flushers > 0 || start_forced && flush_queue.size() > 0 || flush_queue.size() >= sync_threshold;
 }
 
 void journal_flusher_t::loop()
 {
-    target_flusher_count = bs->write_iodepth*2;
+    for (int i = 0; i < flusher_count; i++)
-    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)
     {
-        while (target_flusher_count < cur_flusher_count)
+        if (!active_flushers && (start_forced ? !flush_queue.size() : (flush_queue.size() < sync_threshold)))
         {
-            if (co[cur_flusher_count-1].wait_state)
+            return;
-                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 +83,10 @@ 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))
-    {
-        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())
     {
@@ -128,129 +96,16 @@ 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))
-    {
-        dequeuing = true;
-        bs->ringloop->wakeup();
     }
 }
 
-void journal_flusher_t::remove_flush(object_id oid)
+void journal_flusher_t::force_start()
 {
-#ifdef BLOCKSTORE_DEBUG
+    start_forced = true;
-    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;
-    trim_wanted++;
     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--;
-}
-
-void journal_flusher_t::dump_diagnostics()
-{
-    const char *unflushable_type = "";
-    obj_ver_id unflushable = {};
-    // Try to find out if there is a flushable object for information
-    for (object_id cur_oid: flush_queue)
-    {
-        obj_ver_id cur = { .oid = cur_oid, .version = flush_versions[cur_oid] };
-        auto dirty_end = bs->dirty_db.find(cur);
-        if (dirty_end == bs->dirty_db.end())
-        {
-            // Already flushed
-            continue;
-        }
-        auto repeat_it = sync_to_repeat.find(cur.oid);
-        if (repeat_it != sync_to_repeat.end())
-        {
-            // Someone is already flushing it
-            unflushable_type = "locked,";
-            unflushable = cur;
-            break;
-        }
-        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))
-        {
-            // Object is more recent than possible to flush
-            bool found = try_find_older(dirty_end, cur);
-            if (!found)
-            {
-                unflushable_type = "dirty,";
-                unflushable = cur;
-                break;
-            }
-        }
-        unflushable_type = "ok,";
-        unflushable = cur;
-        break;
-    }
-    printf(
-        "Flusher: queued=%ld first=%s%lx:%lx trim_wanted=%d dequeuing=%d trimming=%d cur=%d target=%d active=%d syncing=%d\n",
-        flush_queue.size(), unflushable_type, unflushable.oid.inode, unflushable.oid.stripe,
-        trim_wanted, dequeuing, trimming, cur_flusher_count, target_flusher_count,
-        active_flushers, syncing_flushers
-    );
-}
-
-bool journal_flusher_t::try_find_older(std::map<obj_ver_id, dirty_entry>::iterator & dirty_end, obj_ver_id & cur)
-{
-    bool found = false;
-    while (dirty_end != bs->dirty_db.begin())
-    {
-        dirty_end--;
-        if (dirty_end->first.oid != cur.oid)
-        {
-            break;
-        }
-        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)))
-        {
-            found = true;
-            cur.version = dirty_end->first.version;
-            break;
-        }
-    }
-    return found;
-}
-
 #define await_sqe(label) \
     resume_##label:\
         sqe = bs->get_sqe();\
@@ -261,7 +116,6 @@ bool journal_flusher_t::try_find_older(std::map<obj_ver_id, dirty_entry>::iterat
         }\
         data = ((ring_data_t*)sqe->user_data);
 
-// FIXME: Implement batch flushing
 bool journal_flusher_co::loop()
 {
     // This is much better than implementing the whole function as an FSM
@@ -300,24 +154,11 @@ 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 ||
+    if (!flusher->flush_queue.size() ||
-        !flusher->flush_queue.size() || !flusher->dequeuing)
+        !flusher->start_forced && !flusher->active_flushers && flusher->flush_queue.size() < flusher->sync_threshold)
     {
-stop_flusher:
+        flusher->start_forced = false;
-        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;
     }
@@ -332,7 +173,7 @@ stop_flusher:
         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);
+            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
@@ -345,103 +186,42 @@ stop_flusher:
         }
         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))
-        {
-            flusher->enqueue_flush(cur);
-            // We can't flush journal sectors that are still written to
-            // However, as we group flushes by oid, current oid may have older writes to flush!
-            // And it may even block writes if we don't flush the older version
-            // (if it's in the beginning of the journal)...
-            // So first try to find an older version of the same object to flush.
-            bool found = flusher->try_find_older(dirty_end, cur);
-            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 (%lx:%lx v%lu, dirty_start=%08lx) - searching for older flushes (%d left)\n",
+        printf("Flushing %lu:%lu v%lu\n", cur.oid.inode, cur.oid.stripe, cur.version);
-                    cur.oid.inode, cur.oid.stripe, cur.version, bs->journal.dirty_start, search_left);
-#endif
-                while (search_left > 0)
-                {
-                    cur.oid = flusher->flush_queue.front();
-                    cur.version = flusher->flush_versions[cur.oid];
-                    flusher->flush_queue.pop_front();
-                    flusher->flush_versions.erase(cur.oid);
-                    dirty_end = bs->dirty_db.find(cur);
-                    if (dirty_end != bs->dirty_db.end())
-                    {
-                        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))
-                        {
-#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);
-#endif
-                            flusher->enqueue_flush(cur);
-                        }
-                        else
-                        {
-                            repeat_it = flusher->sync_to_repeat.find(cur.oid);
-                            if (repeat_it != flusher->sync_to_repeat.end())
-                            {
-                                if (repeat_it->second < cur.version)
-                                    repeat_it->second = cur.version;
-                            }
-                            else
-                            {
-                                flusher->sync_to_repeat[cur.oid] = 0;
-                                break;
-                            }
-                        }
-                    }
-                    search_left--;
-                }
-                if (search_left <= 0)
-                {
-#ifdef BLOCKSTORE_DEBUG
-                    printf("No older flushes, stopping\n");
-#endif
-                    goto stop_flusher;
-                }
-            }
-        }
-#ifdef BLOCKSTORE_DEBUG
-        printf("Flushing %lx:%lx v%lu\n", cur.oid.inode, cur.oid.stripe, cur.version);
 #endif
         flusher->active_flushers++;
 resume_1:
-        // Find it in clean_db
-        {
-            auto & clean_db = bs->clean_db_shard(cur.oid);
-            auto clean_it = clean_db.find(cur.oid);
-            old_clean_loc = (clean_it != clean_db.end() ? clean_it->second.location : UINT64_MAX);
-        }
         // Scan dirty versions of the object
         if (!scan_dirty(1))
         {
             wait_state += 1;
             return false;
         }
-        // Writes and deletes shouldn't happen at the same time
+        if (copy_count == 0 && clean_loc == UINT64_MAX && !has_delete && !has_empty)
-        assert(!has_writes || !has_delete);
-        if (!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);
+            flusher->active_flushers--;
-            goto 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 });
+            }
+            flusher->sync_to_repeat.erase(repeat_it);
+            wait_state = 0;
+            goto resume_0;
         }
+        // Find it in clean_db
+        clean_it = bs->clean_db.find(cur.oid);
+        old_clean_loc = (clean_it != bs->clean_db.end() ? clean_it->second.location : UINT64_MAX);
         if (clean_loc == UINT64_MAX)
         {
-            if (old_clean_loc == UINT64_MAX)
+            if (copy_count > 0 && has_delete || old_clean_loc == UINT64_MAX)
             {
                 // 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);
@@ -489,26 +269,27 @@ resume_1:
         if (bs->clean_entry_bitmap_size)
         {
             new_clean_bitmap = (bs->inmemory_meta
-                ? (uint8_t*)meta_new.buf + meta_new.pos*bs->clean_entry_size + sizeof(clean_disk_entry)
+                ? meta_new.buf + meta_new.pos*bs->clean_entry_size + sizeof(clean_disk_entry)
-                : (uint8_t*)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 };
             data->callback = simple_callback_w;
             my_uring_prep_writev(
-                sqe, bs->data_fd, &data->iov, 1, bs->data_offset + clean_loc + it->offset
+                sqe, bs->data_fd_index, &data->iov, 1, bs->data_offset + clean_loc + it->offset
             );
+            sqe->flags |= IOSQE_FIXED_FILE;
             wait_count++;
         }
         // Sync data before writing metadata
@@ -535,58 +316,37 @@ 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);
-            memset((uint8_t*)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 };
             data->callback = simple_callback_w;
             my_uring_prep_writev(
-                sqe, bs->meta_fd, &data->iov, 1, bs->meta_offset + meta_old.sector
+                sqe, bs->meta_fd_index, &data->iov, 1, bs->meta_offset + meta_old.sector
             );
+            sqe->flags |= IOSQE_FIXED_FILE;
             wait_count++;
         }
         if (has_delete)
         {
-            clean_disk_entry *new_entry = (clean_disk_entry*)((uint8_t*)meta_new.buf + meta_new.pos*bs->clean_entry_size);
+            memset(meta_new.buf + meta_new.pos*bs->clean_entry_size, 0, 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 v%lu) while deleting %lx:%lx\n",
-                    clean_loc >> bs->block_order, new_entry->oid.inode, new_entry->oid.stripe,
-                    new_entry->version, cur.oid.inode, cur.oid.stripe);
-                exit(1);
-            }
-            // zero out new metadata entry
-            memset((uint8_t*)meta_new.buf + meta_new.pos*bs->clean_entry_size, 0, bs->clean_entry_size);
         }
         else
         {
-            clean_disk_entry *new_entry = (clean_disk_entry*)((uint8_t*)meta_new.buf + meta_new.pos*bs->clean_entry_size);
+            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 v%lu) with %lx:%lx v%lu\n",
-                    clean_loc >> bs->block_order, new_entry->oid.inode, new_entry->oid.stripe, new_entry->version,
-                    cur.oid.inode, cur.oid.stripe, cur.version);
-                exit(1);
-            }
             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((uint8_t*)(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 };
         data->callback = simple_callback_w;
         my_uring_prep_writev(
-            sqe, bs->meta_fd, &data->iov, 1, bs->meta_offset + meta_new.sector
+            sqe, bs->meta_fd_index, &data->iov, 1, bs->meta_offset + meta_new.sector
         );
+        sqe->flags |= IOSQE_FIXED_FILE;
         wait_count++;
     resume_7:
         if (wait_count > 0)
@@ -629,35 +389,13 @@ 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)
+        if (!((++flusher->journal_trim_counter) % flusher->journal_trim_interval))
         {
             flusher->journal_trim_counter = 0;
-            new_trim_pos = bs->journal.get_trim_pos();
+            if (bs->journal.trim())
-            if (new_trim_pos != bs->journal.used_start)
             {
-            resume_19:
+                // Update journal "superblock"
-                // 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
                 await_sqe(12);
                 *((journal_entry_start*)flusher->journal_superblock) = {
                     .crc32 = 0,
@@ -665,13 +403,13 @@ resume_1:
                     .type = JE_START,
                     .size = sizeof(journal_entry_start),
                     .reserved = 0,
-                    .journal_start = new_trim_pos,
+                    .journal_start = bs->journal.used_start,
-                    .version = JOURNAL_VERSION,
                 };
                 ((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 };
                 data->callback = simple_callback_w;
-                my_uring_prep_writev(sqe, bs->journal.fd, &data->iov, 1, bs->journal.offset);
+                my_uring_prep_writev(sqe, bs->journal_fd_index, &data->iov, 1, bs->journal.offset);
+                sqe->flags |= IOSQE_FIXED_FILE;
                 wait_count++;
             resume_13:
                 if (wait_count > 0)
@@ -679,34 +417,20 @@ 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\n", cur.oid.inode, cur.oid.stripe, cur.version);
+#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;
     }
@@ -725,82 +449,82 @@ bool journal_flusher_co::scan_dirty(int wait_base)
     copy_count = 0;
     clean_loc = UINT64_MAX;
     has_delete = false;
-    has_writes = false;
+    has_empty = false;
     skip_copy = false;
     clean_init_bitmap = false;
     while (1)
     {
-        if (!IS_STABLE(dirty_it->second.state))
+        if (dirty_it->second.state == ST_J_STABLE && !skip_copy)
-        {
-            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)
         {
             // First we submit all reads
-            has_writes = true;
+            if (dirty_it->second.len == 0)
-            if (dirty_it->second.len != 0)
+            {
+                has_empty = true;
+            }
+            else
             {
                 offset = dirty_it->second.offset;
                 end_offset = dirty_it->second.offset + dirty_it->second.len;
                 it = v.begin();
-                while (end_offset > offset)
+                while (1)
                 {
                     for (; it != v.end(); it++)
-                        if (it->offset+it->len > offset)
+                        if (it->offset >= offset)
                             break;
-                    // If all items end before offset or if the found item starts after end_offset, just insert the buffer
+                    if (it == v.end() || it->offset > offset && it->len > 0)
-                    // If (offset < it->offset < end_offset) insert (offset..it->offset) part
-                    // If (it->offset <= offset <= it->offset+it->len) then just skip to it->offset+it->len
-                    if (it == v.end() || it->offset > offset)
                     {
                         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, (uint8_t*)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
+                                sqe, bs->journal_fd_index, &data->iov, 1, bs->journal.offset + submit_offset
                             );
+                            sqe->flags |= IOSQE_FIXED_FILE;
                             wait_count++;
                         }
                     }
                     offset = it->offset+it->len;
-                    if (it == v.end())
+                    if (it == v.end() || offset >= end_offset)
                         break;
                 }
             }
         }
-        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;
             clean_loc = dirty_it->second.location;
             clean_init_bitmap = true;
             clean_bitmap_offset = dirty_it->second.offset;
             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())
         {
@@ -829,14 +553,14 @@ bool journal_flusher_co::modify_meta_read(uint64_t meta_loc, flusher_meta_write_
     wr.pos = ((meta_loc >> bs->block_order) % (bs->meta_block_size / bs->clean_entry_size));
     if (bs->inmemory_meta)
     {
-        wr.buf = (uint8_t*)bs->metadata_buffer + wr.sector;
+        wr.buf = bs->metadata_buffer + wr.sector;
         return true;
     }
     wr.it = flusher->meta_sectors.find(wr.sector);
     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,
@@ -849,8 +573,9 @@ bool journal_flusher_co::modify_meta_read(uint64_t meta_loc, flusher_meta_write_
         data->callback = simple_callback_r;
         wr.submitted = true;
         my_uring_prep_readv(
-            sqe, bs->meta_fd, &data->iov, 1, bs->meta_offset + wr.sector
+            sqe, bs->meta_fd_index, &data->iov, 1, bs->meta_offset + wr.sector
         );
+        sqe->flags |= IOSQE_FIXED_FILE;
         wait_count++;
     }
     else
@@ -866,29 +591,20 @@ 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",
+        printf("Free block %lu\n", old_clean_loc >> bs->block_order);
-            old_clean_loc >> bs->block_order,
-            cur.oid.inode, cur.oid.stripe, cur.version,
-            clean_loc >> bs->block_order);
 #endif
         bs->data_alloc->set(old_clean_loc >> bs->block_order, false);
     }
-    auto & clean_db = bs->clean_db_shard(cur.oid);
     if (has_delete)
     {
-        auto clean_it = clean_db.find(cur.oid);
+        auto clean_it = bs->clean_db.find(cur.oid);
-        clean_db.erase(clean_it);
+        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;
     }
     else
     {
-        clean_db[cur.oid] = {
+        bs->clean_db[cur.oid] = {
             .version = cur.version,
             .location = clean_loc,
         };
@@ -904,7 +620,7 @@ 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())
@@ -922,37 +638,33 @@ bool journal_flusher_co::fsync_batch(bool fsync_meta, int wait_base)
         });
     sync_found:
         cur_sync->ready_count++;
-        flusher->syncing_flushers++;
+        if (cur_sync->ready_count >= flusher->sync_threshold || !flusher->flush_queue.size())
-    resume_1:
-        if (!cur_sync->state)
         {
-            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_index : bs->data_fd_index, IORING_FSYNC_DATASYNC);
+            sqe->flags |= IOSQE_FIXED_FILE;
+            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--;
         if (cur_sync->ready_count == 0)
         {
@@ -961,3 +673,35 @@ 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;
@@ -48,7 +45,8 @@ class journal_flusher_co
     std::map<object_id, uint64_t>::iterator repeat_it;
     std::function<void(ring_data_t*)> simple_callback_r, simple_callback_w;
 
-    bool skip_copy, has_delete, has_writes;
+    bool skip_copy, has_delete, has_empty;
+    spp::sparse_hash_map<object_id, clean_entry>::iterator clean_it;
     std::vector<copy_buffer_t> v;
     std::vector<copy_buffer_t>::iterator it;
     int copy_count;
@@ -58,8 +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;
 
@@ -68,6 +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();
@@ -76,39 +73,29 @@ public:
 // Journal flusher itself
 class journal_flusher_t
 {
-    int trim_wanted = 0;
+    bool start_forced = false;
-    bool dequeuing;
+    int flusher_count;
-    int min_flusher_count, max_flusher_count, cur_flusher_count, target_flusher_count;
+    int sync_threshold;
-    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;
-    int syncing_flushers;
     std::list<flusher_sync_t> syncs;
     std::map<object_id, uint64_t> sync_to_repeat;
 
     std::map<uint64_t, meta_sector_t> meta_sectors;
     std::deque<object_id> flush_queue;
     std::map<object_id, uint64_t> flush_versions;
-
-    bool try_find_older(std::map<obj_ver_id, dirty_entry>::iterator & dirty_end, obj_ver_id & cur);
-
 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 force_start();
-    void request_trim();
-    void release_trim();
     void enqueue_flush(obj_ver_id oid);
-    void unshift_flush(obj_ver_id oid, bool force);
+    void unshift_flush(obj_ver_id oid);
-    void remove_flush(object_id oid);
-    void dump_diagnostics();
 };

blockstore_impl.cpp

@@ -0,0 +1,458 @@
+#include "blockstore_impl.h"
+
+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->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);
+    try
+    {
+        open_data();
+        open_meta();
+        open_journal();
+        calc_lengths();
+        data_alloc = new allocator(block_count);
+    }
+    catch (std::exception & e)
+    {
+        if (data_fd >= 0)
+            close(data_fd);
+        if (meta_fd >= 0 && meta_fd != data_fd)
+            close(meta_fd);
+        if (journal.fd >= 0 && journal.fd != meta_fd)
+            close(journal.fd);
+        throw;
+    }
+    flusher = new journal_flusher_t(flusher_count, this);
+}
+
+blockstore_impl_t::~blockstore_impl_t()
+{
+    delete data_alloc;
+    delete flusher;
+    free(zero_object);
+    ringloop->unregister_consumer(ring_consumer);
+    if (data_fd >= 0)
+        close(data_fd);
+    if (meta_fd >= 0 && meta_fd != data_fd)
+        close(meta_fd);
+    if (journal.fd >= 0 && journal.fd != meta_fd)
+        close(journal.fd);
+    if (metadata_buffer)
+        free(metadata_buffer);
+    if (clean_bitmap)
+        free(clean_bitmap);
+}
+
+bool blockstore_impl_t::is_started()
+{
+    return initialized == 10;
+}
+
+bool blockstore_impl_t::is_stalled()
+{
+    return queue_stall;
+}
+
+// main event loop - produce requests
+void blockstore_impl_t::loop()
+{
+    // FIXME: initialized == 10 is ugly
+    if (initialized != 10)
+    {
+        // read metadata, then journal
+        if (initialized == 0)
+        {
+            metadata_init_reader = new blockstore_init_meta(this);
+            initialized = 1;
+        }
+        if (initialized == 1)
+        {
+            int res = metadata_init_reader->loop();
+            if (!res)
+            {
+                delete metadata_init_reader;
+                metadata_init_reader = NULL;
+                journal_init_reader = new blockstore_init_journal(this);
+                initialized = 2;
+            }
+        }
+        if (initialized == 2)
+        {
+            int res = journal_init_reader->loop();
+            if (!res)
+            {
+                delete journal_init_reader;
+                journal_init_reader = NULL;
+                initialized = 10;
+                ringloop->wakeup();
+            }
+        }
+    }
+    else
+    {
+        // try to submit ops
+        unsigned initial_ring_space = ringloop->space_left();
+        auto cur_sync = in_progress_syncs.begin();
+        while (cur_sync != in_progress_syncs.end())
+        {
+            continue_sync(*cur_sync++);
+        }
+        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
+            if (PRIV(op)->wait_for)
+            {
+                check_wait(op);
+#ifdef BLOCKSTORE_DEBUG
+                if (PRIV(op)->wait_for)
+                {
+                    printf("still waiting for %d\n", PRIV(op)->wait_for);
+                }
+#endif
+                if (PRIV(op)->wait_for == WAIT_SQE)
+                {
+                    break;
+                }
+                else if (PRIV(op)->wait_for)
+                {
+                    if (op->opcode == BS_OP_WRITE || op->opcode == BS_OP_DELETE)
+                    {
+                        has_writes = 2;
+                    }
+                    continue;
+                }
+            }
+            unsigned ring_space = ringloop->space_left();
+            unsigned prev_sqe_pos = ringloop->save();
+            int dequeue_op = 0;
+            if (op->opcode == BS_OP_READ)
+            {
+                dequeue_op = dequeue_read(op);
+            }
+            else if (op->opcode == BS_OP_WRITE || op->opcode == BS_OP_DELETE)
+            {
+                if (has_writes == 2)
+                {
+                    // Some writes could not be submitted
+                    break;
+                }
+                dequeue_op = dequeue_write(op);
+                has_writes = dequeue_op ? 1 : 2;
+            }
+            else if (op->opcode == BS_OP_SYNC)
+            {
+                // wait for all small writes to be submitted
+                // wait for all big writes to complete, submit data device fsync
+                // wait for the data device fsync to complete, then submit journal writes for big writes
+                // then submit an fsync operation
+                if (has_writes)
+                {
+                    // Can't submit SYNC before previous writes
+                    continue;
+                }
+                dequeue_op = dequeue_sync(op);
+            }
+            else if (op->opcode == BS_OP_STABLE)
+            {
+                dequeue_op = dequeue_stable(op);
+            }
+            else if (op->opcode == BS_OP_ROLLBACK)
+            {
+                dequeue_op = dequeue_rollback(op);
+            }
+            else if (op->opcode == BS_OP_LIST)
+            {
+                process_list(op);
+                dequeue_op = true;
+            }
+            if (dequeue_op)
+            {
+                submit_queue.erase(op_ptr);
+            }
+            else
+            {
+                ringloop->restore(prev_sqe_pos);
+                if (PRIV(op)->wait_for == WAIT_SQE)
+                {
+                    PRIV(op)->wait_detail = 1 + ring_space;
+                    // ring is full, stop submission
+                    break;
+                }
+            }
+        }
+        if (!readonly)
+        {
+            flusher->loop();
+        }
+        int ret = ringloop->submit();
+        if (ret < 0)
+        {
+            throw std::runtime_error(std::string("io_uring_submit: ") + strerror(-ret));
+        }
+        if ((initial_ring_space - ringloop->space_left()) > 0)
+        {
+            live = true;
+        }
+        queue_stall = !live && !ringloop->get_loop_again();
+        live = false;
+    }
+}
+
+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 || in_progress_syncs.size() > 0 || !readonly && flusher->is_active())
+    {
+        return false;
+    }
+    if (unsynced_big_writes.size() > 0 || unsynced_small_writes.size() > 0)
+    {
+        if (!readonly && !stop_sync_submitted)
+        {
+            // We should sync the blockstore before unmounting
+            blockstore_op_t *op = new blockstore_op_t;
+            op->opcode = BS_OP_SYNC;
+            op->buf = NULL;
+            op->callback = [](blockstore_op_t *op)
+            {
+                delete op;
+            };
+            enqueue_op(op);
+            stop_sync_submitted = true;
+        }
+        return false;
+    }
+    return true;
+}
+
+void blockstore_impl_t::check_wait(blockstore_op_t *op)
+{
+    if (PRIV(op)->wait_for == WAIT_SQE)
+    {
+        if (ringloop->space_left() < PRIV(op)->wait_detail)
+        {
+            // stop submission if there's still no free space
+            return;
+        }
+        PRIV(op)->wait_for = 0;
+    }
+    else if (PRIV(op)->wait_for == WAIT_IN_FLIGHT)
+    {
+        auto dirty_it = dirty_db.find((obj_ver_id){
+            .oid = op->oid,
+            .version = PRIV(op)->wait_detail,
+        });
+        if (dirty_it != dirty_db.end() && IS_IN_FLIGHT(dirty_it->second.state))
+        {
+            // do not submit
+            return;
+        }
+        PRIV(op)->wait_for = 0;
+    }
+    else if (PRIV(op)->wait_for == WAIT_JOURNAL)
+    {
+        if (journal.used_start == PRIV(op)->wait_detail)
+        {
+            // do not submit
+            return;
+        }
+        PRIV(op)->wait_for = 0;
+    }
+    else if (PRIV(op)->wait_for == WAIT_JOURNAL_BUFFER)
+    {
+        int next = ((journal.cur_sector + 1) % journal.sector_count);
+        if (journal.sector_info[next].usage_count > 0 ||
+            journal.sector_info[next].dirty)
+        {
+            // do not submit
+            return;
+        }
+        PRIV(op)->wait_for = 0;
+    }
+    else if (PRIV(op)->wait_for == WAIT_FREE)
+    {
+        if (!data_alloc->get_free_count() && !flusher->is_active())
+        {
+            return;
+        }
+        PRIV(op)->wait_for = 0;
+    }
+    else
+    {
+        throw std::runtime_error("BUG: op->wait_for value is unexpected");
+    }
+}
+
+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->offset >= block_size ||
+            op->len > block_size-op->offset ||
+            (op->len % disk_alignment)
+        )) ||
+        readonly && op->opcode != BS_OP_READ ||
+        first && op->opcode == BS_OP_WRITE)
+    {
+        // Basic verification not passed
+        op->retval = -EINVAL;
+        op->callback(op);
+        return;
+    }
+    if (op->opcode == BS_OP_SYNC_STAB_ALL)
+    {
+        std::function<void(blockstore_op_t*)> *old_callback = new std::function<void(blockstore_op_t*)>(op->callback);
+        op->opcode = BS_OP_SYNC;
+        op->callback = [this, old_callback](blockstore_op_t *op)
+        {
+            if (op->retval >= 0 && unstable_writes.size() > 0)
+            {
+                op->opcode = BS_OP_STABLE;
+                op->len = unstable_writes.size();
+                obj_ver_id *vers = new obj_ver_id[op->len];
+                op->buf = vers;
+                int i = 0;
+                for (auto it = unstable_writes.begin(); it != unstable_writes.end(); it++, i++)
+                {
+                    vers[i] = {
+                        .oid = it->first,
+                        .version = it->second,
+                    };
+                }
+                unstable_writes.clear();
+                op->callback = [this, old_callback](blockstore_op_t *op)
+                {
+                    obj_ver_id *vers = (obj_ver_id*)op->buf;
+                    delete[] vers;
+                    op->buf = NULL;
+                    (*old_callback)(op);
+                    delete old_callback;
+                };
+                this->enqueue_op(op);
+            }
+            else
+            {
+                (*old_callback)(op);
+                delete old_callback;
+            }
+        };
+    }
+    if (op->opcode == BS_OP_WRITE && !enqueue_write(op))
+    {
+        op->callback(op);
+        return;
+    }
+    if (0 && op->opcode == BS_OP_SYNC && immediate_commit)
+    {
+        op->retval = 0;
+        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)->sync_state = 0;
+    PRIV(op)->pending_ops = 0;
+    if (!first)
+    {
+        submit_queue.push_back(op);
+    }
+    else
+    {
+        submit_queue.push_front(op);
+    }
+    ringloop->wakeup();
+}
+
+void blockstore_impl_t::process_list(blockstore_op_t *op)
+{
+    // Count objects
+    uint32_t list_pg = op->offset;
+    uint32_t pg_count = op->len;
+    uint64_t parity_block_size = op->oid.stripe;
+    if (pg_count != 0 && (parity_block_size < MIN_BLOCK_SIZE || list_pg >= pg_count))
+    {
+        op->retval = -EINVAL;
+        FINISH_OP(op);
+        return;
+    }
+    uint64_t stable_count = 0;
+    if (pg_count > 0)
+    {
+        for (auto it = clean_db.begin(); it != clean_db.end(); it++)
+        {
+            uint32_t pg = (it->first.inode + it->first.stripe / parity_block_size) % pg_count;
+            if (pg == list_pg)
+            {
+                stable_count++;
+            }
+        }
+    }
+    else
+    {
+        stable_count = clean_db.size();
+    }
+    uint64_t total_count = stable_count;
+    for (auto it = dirty_db.begin(); it != dirty_db.end(); it++)
+    {
+        if (!pg_count || ((it->first.oid.inode + it->first.oid.stripe / parity_block_size) % pg_count) == list_pg)
+        {
+            if (IS_STABLE(it->second.state))
+            {
+                stable_count++;
+            }
+            total_count++;
+        }
+    }
+    // Allocate memory
+    op->version = stable_count;
+    op->retval = total_count;
+    op->buf = malloc(sizeof(obj_ver_id) * total_count);
+    if (!op->buf)
+    {
+        op->retval = -ENOMEM;
+        FINISH_OP(op);
+        return;
+    }
+    obj_ver_id *vers = (obj_ver_id*)op->buf;
+    int i = 0;
+    for (auto it = clean_db.begin(); it != clean_db.end(); it++)
+    {
+        if (!pg_count || ((it->first.inode + it->first.stripe / parity_block_size) % pg_count) == list_pg)
+        {
+            vers[i++] = {
+                .oid = it->first,
+                .version = it->second.version,
+            };
+        }
+    }
+    int j = stable_count;
+    for (auto it = dirty_db.begin(); it != dirty_db.end(); it++)
+    {
+        if (!pg_count || ((it->first.oid.inode + it->first.oid.stripe / parity_block_size) % pg_count) == list_pg)
+        {
+            if (IS_STABLE(it->second.state))
+            {
+                vers[i++] = it->first;
+            }
+            else
+            {
+                vers[j++] = it->first;
+            }
+        }
+    }
+    FINISH_OP(op);
+}

blockstore_impl.h

@@ -1,16 +1,14 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 (see README.md for details)
-
 #pragma once
 
 #include "blockstore.h"
+#include "timerfd_interval.h"
 
 #include <sys/types.h>
 #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>
@@ -18,50 +16,43 @@
 #include <deque>
 #include <new>
 
-#include "cpp-btree/btree_map.h"
+#include "sparsepp/sparsepp/spp.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 ST_J_IN_FLIGHT 1
-#define BS_ST_BIG_WRITE 0x02
+#define ST_J_SUBMITTED 2
-#define BS_ST_DELETE 0x03
+#define ST_J_WRITTEN 3
+#define ST_J_SYNCED 4
+#define ST_J_STABLE 5
 
-#define BS_ST_WAIT_DEL 0x10
+#define ST_D_IN_FLIGHT 15
-#define BS_ST_WAIT_BIG 0x20
+#define ST_D_SUBMITTED 16
-#define BS_ST_IN_FLIGHT 0x30
+#define ST_D_WRITTEN 17
-#define BS_ST_SUBMITTED 0x40
+#define ST_D_META_WRITTEN 19
-#define BS_ST_WRITTEN 0x50
+#define ST_D_META_SYNCED 20
-#define BS_ST_SYNCED 0x60
+#define ST_D_STABLE 21
-#define BS_ST_STABLE 0x70
 
-#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 IMMEDIATE_NONE 0
+#define ST_CURRENT 48
-#define IMMEDIATE_SMALL 1
-#define IMMEDIATE_ALL 2
 
-#define BS_ST_TYPE_MASK 0x0F
+#define IS_IN_FLIGHT(st) (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 BS_ST_WORKFLOW_MASK 0xF0
+#define IS_STABLE(st) (st == ST_J_STABLE || st == ST_D_STABLE || st == ST_DEL_STABLE || st == ST_CURRENT)
-#define IS_IN_FLIGHT(st) (((st) & 0xF0) <= BS_ST_SUBMITTED)
+#define IS_SYNCED(st) (IS_STABLE(st) || st == ST_J_SYNCED || st == ST_D_META_SYNCED || st == ST_DEL_SYNCED)
-#define IS_STABLE(st) (((st) & 0xF0) == BS_ST_STABLE)
+#define IS_JOURNAL(st) (st >= ST_J_SUBMITTED && st <= ST_J_STABLE)
-#define IS_SYNCED(st) (((st) & 0xF0) >= BS_ST_SYNCED)
+#define IS_BIG_WRITE(st) (st >= ST_D_SUBMITTED && st <= ST_D_STABLE)
-#define IS_JOURNAL(st) (((st) & 0x0F) == BS_ST_SMALL_WRITE)
+#define IS_DELETE(st) (st >= ST_DEL_SUBMITTED && st <= ST_DEL_STABLE)
-#define IS_BIG_WRITE(st) (((st) & 0x0F) == BS_ST_BIG_WRITE)
+#define IS_UNSYNCED(st) (st >= ST_J_SUBMITTED && st <= ST_J_WRITTEN || st >= ST_D_SUBMITTED && st <= ST_D_META_WRITTEN || st >= ST_DEL_SUBMITTED && st <= ST_DEL_WRITTEN)
-#define IS_DELETE(st) (((st) & 0x0F) == BS_ST_DELETE)
-
-#define BS_SUBMIT_CHECK_SQES(n) \
-    if (ringloop->sqes_left() < (n))\
-    {\
-        /* Pause until there are more requests available */\
-        PRIV(op)->wait_detail = (n);\
-        PRIV(op)->wait_for = WAIT_SQE;\
-        return 0;\
-    }
 
 #define BS_SUBMIT_GET_SQE(sqe, data) \
     BS_SUBMIT_GET_ONLY_SQE(sqe); \
@@ -72,7 +63,6 @@
     if (!sqe)\
     {\
         /* Pause until there are more requests available */\
-        PRIV(op)->wait_detail = 1;\
         PRIV(op)->wait_for = WAIT_SQE;\
         return 0;\
     }
@@ -82,32 +72,13 @@
     if (!sqe)\
     {\
         /* Pause until there are more requests available */\
-        PRIV(op)->wait_detail = 1;\
         PRIV(op)->wait_for = WAIT_SQE;\
         return 0;\
     }
 
 #include "blockstore_journal.h"
 
-// "VITAstor"
+// 24 bytes + block bitmap per "clean" entry on disk with fixed metadata tables
-#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
 // FIXME: maybe add crc32's to metadata
 struct __attribute__((__packed__)) clean_disk_entry
 {
@@ -123,7 +94,7 @@ 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;
@@ -132,7 +103,6 @@ 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!)
@@ -154,6 +124,8 @@ struct __attribute__((__packed__)) dirty_entry
 
 // Suspend operation until there are more free SQEs
 #define WAIT_SQE 1
+// Suspend operation until version <wait_detail> of object <oid> is written
+#define WAIT_IN_FLIGHT 2
 // Suspend operation until there are <wait_detail> bytes of free space in the journal on disk
 #define WAIT_JOURNAL 3
 // Suspend operation until the next journal sector buffer is free
@@ -167,7 +139,7 @@ struct fulfill_read_t
 };
 
 #define PRIV(op) ((blockstore_op_private_t*)(op)->private_data)
-#define FINISH_OP(op) PRIV(op)->~blockstore_op_private_t(); std::function<void (blockstore_op_t*)>(op->callback)(op)
+#define FINISH_OP(op) PRIV(op)->~blockstore_op_private_t(); op->callback(op)
 
 struct blockstore_op_private_t
 {
@@ -175,46 +147,29 @@ struct blockstore_op_private_t
     int wait_for;
     uint64_t wait_detail;
     int pending_ops;
-    int op_state;
 
     // Read
     std::vector<fulfill_read_t> read_vec;
 
     // Sync, write
-    int min_flushed_journal_sector, max_flushed_journal_sector;
+    uint64_t min_used_journal_sector, max_used_journal_sector;
 
     // 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 sync_state, prev_sync_count;
 };
 
-// https://github.com/algorithm-ninja/cpp-btree
-// https://github.com/greg7mdp/sparsepp/ was used previously, but it was TERRIBLY slow after resizing
-// with sparsepp, random reads dropped to ~700 iops very fast with just as much as ~32k objects in the DB
-typedef btree::btree_map<object_id, clean_entry> blockstore_clean_db_t;
 typedef std::map<obj_ver_id, dirty_entry> blockstore_dirty_db_t;
 
 #include "blockstore_init.h"
 
 #include "blockstore_flush.h"
 
-typedef uint32_t pool_id_t;
-typedef uint64_t pool_pg_id_t;
-
-#define POOL_ID_BITS 16
-
-struct pool_shard_settings_t
-{
-    uint32_t pg_count;
-    uint32_t pg_stripe_size;
-};
-
 class blockstore_impl_t
 {
     /******* OPTIONS *******/
@@ -222,49 +177,34 @@ class blockstore_impl_t
     uint32_t block_size;
     uint64_t meta_offset;
     uint64_t data_offset;
-    uint64_t cfg_journal_size, cfg_data_size;
+    uint64_t cfg_journal_size;
     // Required write alignment and journal/metadata/data areas' location alignment
-    uint32_t disk_alignment = 4096;
+    uint32_t disk_alignment = 512;
     // Journal block size - minimum_io_size of the journal device is the best choice
-    uint64_t journal_block_size = 4096;
+    uint64_t journal_block_size = 512;
     // Metadata block size - minimum_io_size of the metadata device is the best choice
-    uint64_t meta_block_size = 4096;
+    uint64_t meta_block_size = 512;
     // Sparse write tracking granularity. 4 KB is a good choice. Must be a multiple of disk_alignment
     uint64_t bitmap_granularity = 4096;
     bool readonly = false;
-    // By default, Blockstore locks all opened devices exclusively. This option can be used to disable locking
-    bool disable_flock = false;
     // It is safe to disable fsync() if drive write cache is writethrough
     bool disable_data_fsync = false, disable_meta_fsync = false, disable_journal_fsync = false;
     // Enable if you want every operation to be executed with an "implicit fsync"
-    // Suitable only for server SSDs with capacitors, requires disabled data and journal fsyncs
+    // FIXME Not implemented yet
-    int immediate_commit = IMMEDIATE_NONE;
+    bool immediate_commit = false;
     bool inmemory_meta = false;
-    // Maximum and minimum flusher count
+    int 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;
-    // Maximum number of LIST operations to be processed between
-    int single_tick_list_limit = 1;
     /******* END OF OPTIONS *******/
 
     struct ring_consumer_t ring_consumer;
 
-    std::map<pool_id_t, pool_shard_settings_t> clean_db_settings;
+    // Another option is https://github.com/algorithm-ninja/cpp-btree
-    std::map<pool_pg_id_t, blockstore_clean_db_t> clean_db_shards;
+    spp::sparse_hash_map<object_id, clean_entry> 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;
 
@@ -276,17 +216,15 @@ class blockstore_impl_t
     int data_fd;
     uint64_t meta_size, meta_area, meta_len;
     uint64_t data_size, data_len;
-    uint64_t data_device_sect, meta_device_sect, journal_device_sect;
+    int meta_fd_index, data_fd_index, journal_fd_index;
 
     void *metadata_buffer = NULL;
 
     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;
 
     bool stop_sync_submitted;
 
@@ -297,7 +235,7 @@ class blockstore_impl_t
 
     friend class blockstore_init_meta;
     friend class blockstore_init_journal;
-    friend struct blockstore_journal_check_t;
+    friend class blockstore_journal_check_t;
     friend class journal_flusher_t;
     friend class journal_flusher_co;
 
@@ -306,14 +244,6 @@ 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);
-
-    blockstore_clean_db_t& clean_db_shard(object_id oid);
-    void reshard_clean_db(pool_id_t pool_id, uint32_t pg_count, uint32_t pg_stripe_size);
-
-    // Journaling
-    void prepare_journal_sector_write(int sector, blockstore_op_t *op);
-    void handle_journal_write(ring_data_t *data, uint64_t flush_id);
 
     // Asynchronous init
     int initialized;
@@ -333,27 +263,27 @@ 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);
+    void ack_write(blockstore_op_t *op);
     void release_journal_sectors(blockstore_op_t *op);
     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 ack_sync(blockstore_op_t *op);
+    void handle_sync_event(ring_data_t *data, 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 handle_stable_event(ring_data_t *data, blockstore_op_t *op);
-    void mark_stable(const obj_ver_id & ov, bool forget_dirty = false);
     void stabilize_object(object_id oid, uint64_t max_ver);
 
     // Rollback
     int dequeue_rollback(blockstore_op_t *op);
-    int continue_rollback(blockstore_op_t *op);
+    void handle_rollback_event(ring_data_t *data, blockstore_op_t *op);
-    void mark_rolled_back(const obj_ver_id & ov);
     void erase_dirty(blockstore_dirty_db_t::iterator dirty_start, blockstore_dirty_db_t::iterator dirty_end, uint64_t clean_loc);
 
     // List
@@ -361,7 +291,7 @@ 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
@@ -380,23 +310,12 @@ public:
     bool is_stalled();
 
     // Submission
-    void enqueue_op(blockstore_op_t *op);
+    void enqueue_op(blockstore_op_t *op, bool first = false);
-
-    // 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);
 
     // 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;
-
-    // Print diagnostics to stdout
-    void dump_diagnostics();
-
     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_disk_alignment() { return disk_alignment; }
-    inline uint32_t get_bitmap_granularity() { return disk_alignment; }
-    inline uint64_t get_journal_size() { return journal.len; }
 };

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;
@@ -55,114 +32,31 @@ 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;
-    bs->meta_len -= 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 = {
-                (uint8_t*)metadata_buffer + (bs->inmemory_meta
+                metadata_buffer + (bs->inmemory_meta
                     ? metadata_read
                     : (prev == 1 ? bs->metadata_buf_size : 0)),
                 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_index, &data->iov, 1, bs->meta_offset + metadata_read);
-                my_uring_prep_readv(sqe, bs->meta_fd, &data->iov, 1, bs->meta_offset + metadata_read);
+            sqe->flags |= IOSQE_FIXED_FILE;
-            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);
-            }
             bs->ringloop->submit();
             submitted = (prev == 1 ? 2 : 1);
             prev = submitted;
@@ -170,13 +64,13 @@ resume_1:
         if (prev_done)
         {
             void *done_buf = bs->inmemory_meta
-                ? ((uint8_t*)metadata_buffer + done_pos)
+                ? (metadata_buffer + done_pos)
-                : ((uint8_t*)metadata_buffer + (prev_done == 2 ? bs->metadata_buf_size : 0));
+                : (metadata_buffer + (prev_done == 2 ? bs->metadata_buf_size : 0));
             unsigned count = bs->meta_block_size / bs->clean_entry_size;
             for (int sector = 0; sector < done_len; sector += bs->meta_block_size)
             {
                 // handle <count> entries
-                handle_entries((uint8_t*)done_buf + sector, count, bs->block_order);
+                handle_entries(done_buf + sector, count, bs->block_order);
                 done_cnt += count;
             }
             prev_done = 0;
@@ -194,21 +88,6 @@ 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;
 }
 
@@ -216,38 +95,30 @@ void blockstore_init_meta::handle_entries(void* entries, unsigned count, int blo
 {
     for (unsigned i = 0; i < count; i++)
     {
-        clean_disk_entry *entry = (clean_disk_entry*)((uint8_t*)entries + i*bs->clean_entry_size);
+        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)
         {
-            auto & clean_db = bs->clean_db_shard(entry->oid);
+            auto clean_it = bs->clean_db.find(entry->oid);
-            auto clean_it = clean_db.find(entry->oid);
+            if (clean_it == bs->clean_db.end() || clean_it->second.version < entry->version)
-            if (clean_it == clean_db.end() || clean_it->second.version < entry->version)
             {
-                if (clean_it != clean_db.end())
+                if (clean_it != bs->clean_db.end())
                 {
                     // free the previous block
 #ifdef BLOCKSTORE_DEBUG
-                    printf("Free block %lu from %lx:%lx v%lu (new location is %lu)\n",
+                    printf("Free block %lu\n", clean_it->second.location >> bs->block_order);
-                        clean_it->second.location >> block_order,
-                        clean_it->first.inode, clean_it->first.stripe, clean_it->second.version,
-                        done_cnt+i);
 #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);
-                clean_db[entry->oid] = (struct clean_entry){
+                bs->clean_db[entry->oid] = (struct clean_entry){
                     .version = entry->version,
                     .location = (done_cnt+i) << block_order,
                 };
@@ -255,7 +126,7 @@ 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
             }
         }
@@ -276,6 +147,14 @@ 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)
@@ -300,6 +179,12 @@ 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)
@@ -318,7 +203,11 @@ 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
@@ -328,7 +217,8 @@ int blockstore_init_journal::loop()
     data = ((ring_data_t*)sqe->user_data);
     data->iov = { submitted_buf, bs->journal.block_size };
     data->callback = simple_callback;
-    my_uring_prep_readv(sqe, bs->journal.fd, &data->iov, 1, bs->journal.offset);
+    my_uring_prep_readv(sqe, bs->journal_fd_index, &data->iov, 1, bs->journal.offset);
+    sqe->flags |= IOSQE_FIXED_FILE;
     bs->ringloop->submit();
     wait_count = 1;
 resume_1:
@@ -337,7 +227,7 @@ 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)
@@ -352,7 +242,6 @@ 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)
@@ -367,7 +256,8 @@ resume_1:
             GET_SQE();
             data->iov = (struct iovec){ submitted_buf, 2*bs->journal.block_size };
             data->callback = simple_callback;
-            my_uring_prep_writev(sqe, bs->journal.fd, &data->iov, 1, bs->journal.offset);
+            my_uring_prep_writev(sqe, bs->journal_fd_index, &data->iov, 1, bs->journal.offset);
+            sqe->flags |= IOSQE_FIXED_FILE;
             wait_count++;
             bs->ringloop->submit();
         resume_6:
@@ -379,7 +269,8 @@ resume_1:
             if (!bs->disable_journal_fsync)
             {
                 GET_SQE();
-                my_uring_prep_fsync(sqe, bs->journal.fd, IORING_FSYNC_DATASYNC);
+                my_uring_prep_fsync(sqe, bs->journal_fd_index, IORING_FSYNC_DATASYNC);
+                sqe->flags |= IOSQE_FIXED_FILE;
                 data->iov = { 0 };
                 data->callback = simple_callback;
                 wait_count++;
@@ -403,21 +294,11 @@ 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 != sizeof(journal_entry_start) && je_start->size != JE_START_LEGACY_SIZE)
+            je_crc32((journal_entry*)je_start) != je_start->crc32)
         {
             // Entry is corrupt
-            fprintf(stderr, "First entry of the journal is corrupt\n");
+            throw std::runtime_error("first entry of the journal is corrupt");
-            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);
         }
         next_free = journal_pos = bs->journal.used_start = je_start->journal_start;
         if (!bs->journal.inmemory)
@@ -440,15 +321,16 @@ 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 = (uint8_t*)bs->journal.buffer + journal_pos;
+                    submitted_buf = bs->journal.buffer + journal_pos;
                 data->iov = {
                     submitted_buf,
                     end - journal_pos < JOURNAL_BUFFER_SIZE ? end - journal_pos : JOURNAL_BUFFER_SIZE,
                 };
                 data->callback = [this](ring_data_t *data1) { handle_event(data1); };
-                my_uring_prep_readv(sqe, bs->journal.fd, &data->iov, 1, bs->journal.offset + journal_pos);
+                my_uring_prep_readv(sqe, bs->journal_fd_index, &data->iov, 1, bs->journal.offset + journal_pos);
+                sqe->flags |= IOSQE_FIXED_FILE;
                 bs->ringloop->submit();
             }
             while (done.size() > 0)
@@ -463,7 +345,8 @@ resume_1:
                         GET_SQE();
                         data->iov = { init_write_buf, bs->journal.block_size };
                         data->callback = simple_callback;
-                        my_uring_prep_writev(sqe, bs->journal.fd, &data->iov, 1, bs->journal.offset + init_write_sector);
+                        my_uring_prep_writev(sqe, bs->journal_fd_index, &data->iov, 1, bs->journal.offset + init_write_sector);
+                        sqe->flags |= IOSQE_FIXED_FILE;
                         wait_count++;
                         bs->ringloop->submit();
                     resume_7:
@@ -477,7 +360,8 @@ resume_1:
                             GET_SQE();
                             data->iov = { 0 };
                             data->callback = simple_callback;
-                            my_uring_prep_fsync(sqe, bs->journal.fd, IORING_FSYNC_DATASYNC);
+                            my_uring_prep_fsync(sqe, bs->journal_fd_index, IORING_FSYNC_DATASYNC);
+                            sqe->flags |= IOSQE_FIXED_FILE;
                             wait_count++;
                             bs->ringloop->submit();
                         }
@@ -523,22 +407,10 @@ resume_1:
             }
         }
     }
-    for (auto ov: double_allocs)
+    // Trim journal on start so we don't stall when all entries are older
-    {
+    bs->journal.trim();
-        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();
-    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",
+        "Journal entries loaded: %lu, free journal space: %lu bytes (%lu..%lu is used), free blocks: %lu / %lu\n",
         entries_loaded,
         (bs->journal.next_free >= bs->journal.used_start
             ? bs->journal.len-bs->journal.block_size - (bs->journal.next_free-bs->journal.used_start)
@@ -572,9 +444,9 @@ int blockstore_init_journal::handle_journal_part(void *buf, uint64_t done_pos, u
     resume:
         while (pos < bs->journal.block_size)
         {
-            journal_entry *je = (journal_entry*)((uint8_t*)buf + proc_pos - done_pos + pos);
+            journal_entry *je = (journal_entry*)(buf + proc_pos - done_pos + pos);
             if (je->magic != JOURNAL_MAGIC || je_crc32(je) != je->crc32 ||
-                je->type < JE_MIN || je->type > JE_MAX || started && je->crc32_prev != crc32_last)
+                je->type < JE_SMALL_WRITE || je->type > JE_DELETE || started && je->crc32_prev != crc32_last)
             {
                 if (pos == 0)
                 {
@@ -588,15 +460,10 @@ 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(
+                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);
-                    "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
-                );
 #endif
                 // oid, version, offset, len
                 uint64_t prev_free = next_free;
@@ -614,14 +481,14 @@ int blockstore_init_journal::handle_journal_part(void *buf, uint64_t done_pos, u
                 if (location != je->small_write.data_offset)
                 {
                     char err[1024];
-                    snprintf(err, 1024, "BUG: calculated journal data offset (%08lx) != stored journal data offset (%08lx)", location, je->small_write.data_offset);
+                    snprintf(err, 1024, "BUG: calculated journal data offset (%lu) != stored journal data offset (%lu)", location, je->small_write.data_offset);
                     throw std::runtime_error(err);
                 }
                 uint32_t data_crc32 = 0;
                 if (location >= done_pos && location+je->small_write.len <= done_pos+len)
                 {
                     // data is within this buffer
-                    data_crc32 = crc32c(0, (uint8_t*)buf + location - done_pos, je->small_write.len);
+                    data_crc32 = crc32c(0, buf + location - done_pos, je->small_write.len);
                 }
                 else
                 {
@@ -636,7 +503,7 @@ int blockstore_init_journal::handle_journal_part(void *buf, uint64_t done_pos, u
                                 ? location+je->small_write.len : done[i].pos+done[i].len);
                             uint64_t part_begin = (location < done[i].pos ? done[i].pos : location);
                             covered += part_end - part_begin;
-                            data_crc32 = crc32c(data_crc32, (uint8_t*)done[i].buf + part_begin - done[i].pos, part_end - part_begin);
+                            data_crc32 = crc32c(data_crc32, done[i].buf + part_begin - done[i].pos, part_end - part_begin);
                         }
                     }
                     if (covered < je->small_write.len)
@@ -649,98 +516,44 @@ int blockstore_init_journal::handle_journal_part(void *buf, uint64_t done_pos, u
                 if (data_crc32 != je->small_write.crc32_data)
                 {
                     // journal entry is corrupt, stop here
-                    // interesting thing is that we must clear the corrupt entry if we're not readonly,
+                    // interesting thing is that we must clear the corrupt entry if we're not readonly
-                    // because we don't write next entries in the same journal block
+                    memset(buf + proc_pos - done_pos + pos, 0, bs->journal.block_size - pos);
-                    printf("Journal entry data is corrupt (data crc32 %x != %x)\n", data_crc32, je->small_write.crc32_data);
-                    memset((uint8_t*)buf + proc_pos - done_pos + pos, 0, bs->journal.block_size - pos);
                     bs->journal.next_free = prev_free;
-                    init_write_buf = (uint8_t*)buf + proc_pos - done_pos;
+                    init_write_buf = buf + proc_pos - done_pos;
                     init_write_sector = proc_pos;
                     return 0;
                 }
-                auto & clean_db = bs->clean_db_shard(je->small_write.oid);
+                auto clean_it = bs->clean_db.find(je->small_write.oid);
-                auto clean_it = clean_db.find(je->small_write.oid);
+                if (clean_it == bs->clean_db.end() ||
-                if (clean_it == clean_db.end() ||
+                    clean_it->second.version < je->big_write.version)
-                    clean_it->second.version < je->small_write.version)
                 {
                     obj_ver_id ov = {
                         .oid = je->small_write.oid,
                         .version = je->small_write.version,
                     };
-                    void *bmp = NULL;
-                    void *bmp_from = (uint8_t*)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(
+                    printf("journal offset %lu is used by %lu:%lu v%lu\n", proc_pos, ov.oid.inode, ov.oid.stripe, ov.version);
-                        "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_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(
+                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);
-                    "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
-                );
 #endif
-                auto dirty_it = bs->dirty_db.upper_bound((obj_ver_id){
+                auto clean_it = bs->clean_db.find(je->big_write.oid);
-                    .oid = je->big_write.oid,
+                if (clean_it == bs->clean_db.end() ||
-                    .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_db = bs->clean_db_shard(je->big_write.oid);
-                auto clean_it = clean_db.find(je->big_write.oid);
-                if (clean_it == clean_db.end() ||
                     clean_it->second.version < je->big_write.version)
                 {
                     // oid, version, block
@@ -748,134 +561,131 @@ 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;
+                    bs->dirty_db.emplace(ov, (dirty_entry){
-                    void *bmp_from = (uint8_t*)je + sizeof(journal_entry_big_write);
+                        .state = ST_D_META_SYNCED,
-                    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),
                         .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(
+                    printf("Allocate block %lu\n", je->big_write.location >> bs->block_order);
-                            "Allocate block (journal) %lu: %lx:%lx v%lu\n",
-                            je->big_write.location >> bs->block_order,
-                            ov.oid.inode, ov.oid.stripe, ov.version
-                        );
 #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);
+                auto it = bs->dirty_db.find(ov);
+                if (it == bs->dirty_db.end())
+                {
+                    // journal contains a legitimate STABLE entry for a non-existing dirty write
+                    // this probably means that journal was trimmed between WRITE and STABLE entries
+                    // skip it
+                }
+                else
+                {
+                    while (1)
+                    {
+                        it->second.state = (it->second.state == ST_D_META_SYNCED
+                            ? ST_D_STABLE
+                            : (it->second.state == ST_DEL_SYNCED ? ST_DEL_STABLE : ST_J_STABLE));
+                        if (it == bs->dirty_db.begin())
+                            break;
+                        it--;
+                        if (it->first.oid != ov.oid || IS_STABLE(it->second.state))
+                            break;
+                    }
+                    bs->flusher->enqueue_flush(ov);
+                }
+                auto unstab_it = bs->unstable_writes.find(ov.oid);
+                if (unstab_it != bs->unstable_writes.end() && unstab_it->second <= ov.version)
+                {
+                    bs->unstable_writes.erase(unstab_it);
+                }
             }
             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 = {
+                auto it = bs->dirty_db.lower_bound((obj_ver_id){
                     .oid = je->rollback.oid,
-                    .version = je->rollback.version,
+                    .version = UINT64_MAX,
-                };
+                });
-                bs->mark_rolled_back(ov);
+                if (it != bs->dirty_db.begin())
+                {
+                    uint64_t max_unstable = 0;
+                    auto rm_start = it;
+                    auto rm_end = it;
+                    it--;
+                    while (it->first.oid == je->rollback.oid &&
+                        it->first.version > je->rollback.version &&
+                        !IS_IN_FLIGHT(it->second.state) &&
+                        !IS_STABLE(it->second.state))
+                    {
+                        if (it->first.oid != je->rollback.oid)
+                            break;
+                        else if (it->first.version <= je->rollback.version)
+                        {
+                            if (!IS_STABLE(it->second.state))
+                                max_unstable = it->first.version;
+                            break;
+                        }
+                        else if (IS_STABLE(it->second.state))
+                            break;
+                        // Remove entry
+                        rm_start = it;
+                        if (it == bs->dirty_db.begin())
+                            break;
+                        it--;
+                    }
+                    if (rm_start != rm_end)
+                    {
+                        bs->erase_dirty(rm_start, rm_end, UINT64_MAX);
+                    }
+                    auto unstab_it = bs->unstable_writes.find(je->rollback.oid);
+                    if (unstab_it != bs->unstable_writes.end())
+                    {
+                        if (max_unstable == 0)
+                            bs->unstable_writes.erase(unstab_it);
+                        else
+                            unstab_it->second = max_unstable;
+                    }
+                }
             }
             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;
+                // oid, version
-                auto dirty_it = bs->dirty_db.upper_bound((obj_ver_id){
+                obj_ver_id ov = {
                     .oid = je->del.oid,
-                    .version = UINT64_MAX,
+                    .version = je->del.version,
+                };
+                bs->dirty_db.emplace(ov, (dirty_entry){
+                    .state = ST_DEL_SYNCED,
+                    .flags = 0,
+                    .location = 0,
+                    .offset = 0,
+                    .len = 0,
+                    .journal_sector = proc_pos,
                 });
-                if (dirty_it != bs->dirty_db.begin())
+                bs->journal.used_sectors[proc_pos]++;
-                {
-                    dirty_it--;
-                    dirty_exists = dirty_it->first.oid == je->del.oid;
-                }
-                auto & clean_db = bs->clean_db_shard(je->del.oid);
-                auto clean_it = clean_db.find(je->del.oid);
-                bool clean_exists = (clean_it != 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)
-                {
-                    // oid, version
-                    obj_ver_id ov = {
-                        .oid = je->del.oid,
-                        .version = je->del.version,
-                    };
-                    bs->dirty_db.emplace(ov, (dirty_entry){
-                        .state = (BS_ST_DELETE | BS_ST_SYNCED),
-                        .flags = 0,
-                        .location = 0,
-                        .offset = 0,
-                        .len = 0,
-                        .journal_sector = proc_pos,
-                    });
-                    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);
-                }
-                // Ignore delete if neither preceding dirty entries nor the clean one are present
             }
             started = true;
             pos += je->size;
@@ -886,36 +696,3 @@ 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_db = bs->clean_db_shard(oid);
-    auto clean_it = clean_db.find(oid);
-    uint64_t clean_loc = clean_it != 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;
+    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

@@ -0,0 +1,187 @@
+#include "blockstore_impl.h"
+
+blockstore_journal_check_t::blockstore_journal_check_t(blockstore_impl_t *bs)
+{
+    this->bs = bs;
+    sectors_required = 0;
+    next_pos = bs->journal.next_free;
+    next_sector = bs->journal.cur_sector;
+    next_in_pos = bs->journal.in_sector_pos;
+    right_dir = next_pos >= bs->journal.used_start;
+}
+
+// Check if we can write <required> entries of <size> bytes and <data_after> data bytes after them to the journal
+int blockstore_journal_check_t::check_available(blockstore_op_t *op, int required, int size, int data_after)
+{
+    while (1)
+    {
+        int fits = (bs->journal.block_size - next_in_pos) / size;
+        if (fits > 0)
+        {
+            required -= fits;
+            next_in_pos += fits * size;
+            sectors_required++;
+        }
+        else if (bs->journal.sector_info[next_sector].dirty)
+        {
+            // sectors_required is more like "sectors to write"
+            sectors_required++;
+        }
+        if (required <= 0)
+        {
+            break;
+        }
+        next_pos = next_pos + bs->journal.block_size;
+        if (next_pos >= bs->journal.len)
+        {
+            next_pos = bs->journal.block_size;
+            right_dir = false;
+        }
+        next_in_pos = 0;
+        if (bs->journal.sector_info[next_sector].usage_count > 0 ||
+            bs->journal.sector_info[next_sector].dirty)
+        {
+            next_sector = ((next_sector + 1) % bs->journal.sector_count);
+        }
+        if (bs->journal.sector_info[next_sector].usage_count > 0 ||
+            bs->journal.sector_info[next_sector].dirty)
+        {
+            // No memory buffer available. Wait for it.
+#ifdef BLOCKSTORE_DEBUG
+            printf("next journal buffer %d is still dirty=%d used=%d\n", next_sector,
+                bs->journal.sector_info[next_sector].dirty, bs->journal.sector_info[next_sector].usage_count);
+#endif
+            PRIV(op)->wait_for = WAIT_JOURNAL_BUFFER;
+            return 0;
+        }
+    }
+    if (data_after > 0)
+    {
+        next_pos = next_pos + data_after;
+        if (next_pos > bs->journal.len)
+        {
+            next_pos = bs->journal.block_size + data_after;
+            right_dir = false;
+        }
+    }
+    if (!right_dir && next_pos >= bs->journal.used_start-bs->journal.block_size)
+    {
+        // No space in the journal. Wait until used_start changes.
+        printf(
+            "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->force_start();
+        PRIV(op)->wait_detail = bs->journal.used_start;
+        return 0;
+    }
+    return 1;
+}
+
+journal_entry* prefill_single_journal_entry(journal_t & journal, uint16_t type, uint32_t 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].usage_count > 0)
+        {
+            // Also select next sector buffer in memory
+            journal.cur_sector = ((journal.cur_sector + 1) % journal.sector_count);
+        }
+        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;
+        memset(journal.inmemory
+            ? journal.buffer + journal.sector_info[journal.cur_sector].offset
+            : journal.sector_buf + journal.block_size*journal.cur_sector, 0, journal.block_size);
+    }
+    journal_entry *je = (struct journal_entry*)(
+        (journal.inmemory
+            ? journal.buffer + journal.sector_info[journal.cur_sector].offset
+            : journal.sector_buf + journal.block_size*journal.cur_sector) + journal.in_sector_pos
+    );
+    journal.in_sector_pos += size;
+    je->magic = JOURNAL_MAGIC;
+    je->type = type;
+    je->size = size;
+    je->crc32_prev = journal.crc32_last;
+    journal.sector_info[journal.cur_sector].dirty = true;
+    return je;
+}
+
+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].usage_count++;
+    ring_data_t *data = ((ring_data_t*)sqe->user_data);
+    data->iov = (struct iovec){
+        (journal.inmemory
+            ? journal.buffer + journal.sector_info[cur_sector].offset
+            : journal.sector_buf + journal.block_size*cur_sector),
+        journal.block_size
+    };
+    data->callback = cb;
+    my_uring_prep_writev(
+        sqe, journal.fd_index, &data->iov, 1, journal.offset + journal.sector_info[cur_sector].offset
+    );
+    sqe->flags |= IOSQE_FIXED_FILE;
+}
+
+journal_t::~journal_t()
+{
+    if (sector_buf)
+        free(sector_buf);
+    if (sector_info)
+        free(sector_info);
+    if (buffer)
+        free(buffer);
+    sector_buf = NULL;
+    sector_info = NULL;
+    buffer = NULL;
+}
+
+bool journal_t::trim()
+{
+    auto journal_used_it = used_sectors.lower_bound(used_start);
+#ifdef BLOCKSTORE_DEBUG
+    printf(
+        "Trimming journal (used_start=%lu, next_free=%lu, first_used=%lu, usage_count=%lu)\n",
+        used_start, next_free,
+        journal_used_it == used_sectors.end() ? 0 : journal_used_it->first,
+        journal_used_it == used_sectors.end() ? 0 : journal_used_it->second
+    );
+#endif
+    if (journal_used_it == used_sectors.end())
+    {
+        // Journal is cleared to its end, restart from the beginning
+        journal_used_it = used_sectors.begin();
+        if (journal_used_it == used_sectors.end())
+        {
+            // Journal is empty
+            used_start = next_free;
+        }
+        else
+        {
+            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>
+        used_start = journal_used_it->first;
+    }
+    else
+    {
+        // Can't trim journal
+        return false;
+    }
+#ifdef BLOCKSTORE_DEBUG
+    printf("Journal trimmed to %lu (next_free=%lu)\n", used_start, next_free);
+#endif
+    return true;
+}

blockstore_journal.h

@@ -1,34 +1,23 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 (see README.md for details)
-
 #pragma once
 
 #include "crc32c.h"
-#include <set>
 
 #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
 // Journal entries are linked to each other by their crc32 value
 // The journal is almost a blockchain, because object versions constantly increase
-#define JE_MIN         0x01
 #define JE_START       0x01
 #define JE_SMALL_WRITE 0x02
 #define JE_BIG_WRITE   0x03
 #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
 
 // crc32c comes first to ease calculation and is equal to crc32()
 struct __attribute__((__packed__)) journal_entry_start
@@ -39,9 +28,7 @@ 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
 {
@@ -58,9 +45,6 @@ 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
@@ -75,9 +59,6 @@ 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
@@ -143,52 +124,29 @@ inline uint32_t je_crc32(journal_entry *je)
 struct journal_sector_info_t
 {
     uint64_t offset;
-    uint64_t flush_count;
+    uint64_t usage_count;
-    bool written;
     bool dirty;
-    uint64_t submit_id;
 };
 
-struct pending_journaling_t
-{
-    uint64_t flush_id;
-    int sector;
-    blockstore_op_t *op;
-};
-
-inline bool operator < (const pending_journaling_t & a, const pending_journaling_t & b)
-{
-    return a.flush_id < b.flush_id || a.flush_id == b.flush_id && a.op < b.op;
-}
-
 struct journal_t
 {
-    int fd;
+    int fd, fd_index;
     uint64_t device_size;
     bool inmemory = false;
-    bool flush_journal = false;
     void *buffer = NULL;
 
-    uint64_t block_size;
+    uint64_t block_size = 512;
     uint64_t offset, len;
-    // Next free block offset
     uint64_t next_free = 0;
-    // First occupied block offset
     uint64_t used_start = 0;
-    // End of the last block not used for writing anymore
-    uint64_t dirty_start = 0;
     uint32_t crc32_last = 0;
 
     // Current sector(s) used for writing
     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;
-    std::vector<int> submitting_sectors;
-    std::set<pending_journaling_t> flushing_ops;
-    uint64_t submit_id = 0;
 
     // Used sector map
     // May use ~ 80 MB per 1 GB of used journal space in the worst case
@@ -196,20 +154,13 @@ struct journal_t
 
     ~journal_t();
     bool trim();
-    uint64_t get_trim_pos();
-    void dump_diagnostics();
-    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;
     bool right_dir; // writing to the end or the beginning of the ring buffer
 
     blockstore_journal_check_t(blockstore_impl_t *bs);
@@ -217,3 +168,5 @@ struct blockstore_journal_check_t
 };
 
 journal_entry* prefill_single_journal_entry(journal_t & journal, uint16_t type, uint32_t size);
+
+void prepare_journal_sector_write(journal_t & journal, int sector, io_uring_sqe *sqe, std::function<void(ring_data_t*)> cb);

blockstore_open.cpp

@@ -1,7 +1,3 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 (see README.md for details)
-
-#include <sys/file.h>
 #include "blockstore_impl.h"
 
 static uint32_t is_power_of_two(uint64_t value)
@@ -38,28 +34,10 @@ void blockstore_impl_t::parse_config(blockstore_config_t & config)
     {
         disable_journal_fsync = true;
     }
-    if (config["disable_device_lock"] == "true" || config["disable_device_lock"] == "1" || config["disable_device_lock"] == "yes")
-    {
-        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;
-    }
-    else if (config["immediate_commit"] == "small")
-    {
-        immediate_commit = IMMEDIATE_SMALL;
-    }
     metadata_buf_size = strtoull(config["meta_buf_size"].c_str(), NULL, 10);
     cfg_journal_size = strtoull(config["journal_size"].c_str(), NULL, 10);
     data_device = config["data_device"];
     data_offset = strtoull(config["data_offset"].c_str(), NULL, 10);
-    cfg_data_size = strtoull(config["data_size"].c_str(), NULL, 10);
     meta_device = config["meta_device"];
     meta_offset = strtoull(config["meta_offset"].c_str(), NULL, 10);
     block_size = strtoull(config["block_size"].c_str(), NULL, 10);
@@ -67,23 +45,12 @@ 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);
+    flusher_count = strtoull(config["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);
     // Validate
     if (!block_size)
     {
@@ -93,29 +60,21 @@ 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;
+        flusher_count = 32;
-    }
-    if (!min_flusher_count || journal.flush_journal)
-    {
-        min_flusher_count = 1;
-    }
-    if (!max_write_iodepth)
-    {
-        max_write_iodepth = 128;
     }
     if (!disk_alignment)
     {
-        disk_alignment = 4096;
+        disk_alignment = 512;
     }
     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)
     {
-        journal_block_size = 4096;
+        journal_block_size = 512;
     }
     else if (journal_block_size % MEM_ALIGNMENT)
     {
@@ -123,7 +82,7 @@ void blockstore_impl_t::parse_config(blockstore_config_t & config)
     }
     if (!meta_block_size)
     {
-        meta_block_size = 4096;
+        meta_block_size = 512;
     }
     else if (meta_block_size % MEM_ALIGNMENT)
     {
@@ -135,7 +94,7 @@ 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)
     {
@@ -169,41 +128,9 @@ void blockstore_impl_t::parse_config(blockstore_config_t & config)
     {
         metadata_buf_size = 4*1024*1024;
     }
-    if (meta_device == "")
-    {
-        disable_meta_fsync = disable_data_fsync;
-    }
-    if (journal_device == "")
-    {
-        disable_journal_fsync = disable_meta_fsync;
-    }
-    if (immediate_commit != IMMEDIATE_NONE && !disable_journal_fsync)
-    {
-        throw std::runtime_error("immediate_commit requires disable_journal_fsync");
-    }
-    if (immediate_commit == IMMEDIATE_ALL && !disable_data_fsync)
-    {
-        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;
@@ -213,6 +140,10 @@ void blockstore_impl_t::parse_config(blockstore_config_t & config)
 
 void blockstore_impl_t::calc_lengths()
 {
+    // register fds
+    data_fd_index = ringloop->register_fd(data_fd);
+    meta_fd_index = meta_fd == data_fd ? data_fd_index : ringloop->register_fd(meta_fd);
+    journal.fd_index = journal_fd_index = journal.fd == meta_fd ? meta_fd_index : ringloop->register_fd(journal.fd);
     // data
     data_len = data_size - data_offset;
     if (data_fd == meta_fd && data_offset < meta_offset)
@@ -224,15 +155,6 @@ void blockstore_impl_t::calc_lengths()
         data_len = data_len < journal.offset-data_offset
             ? data_len : journal.offset-data_offset;
     }
-    if (cfg_data_size != 0)
-    {
-        if (data_len < cfg_data_size)
-        {
-            throw std::runtime_error("Data area ("+std::to_string(data_len)+
-                " bytes) is less than configured size ("+std::to_string(cfg_data_size)+" bytes)");
-        }
-        data_len = cfg_data_size;
-    }
     // meta
     meta_area = (meta_fd == data_fd ? data_size : meta_size) - meta_offset;
     if (meta_fd == data_fd && meta_offset <= data_offset)
@@ -257,7 +179,7 @@ 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 +192,7 @@ 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");
     }
@@ -295,9 +217,9 @@ void blockstore_impl_t::calc_lengths()
     }
 }
 
-static void check_size(int fd, uint64_t *size, uint64_t *sectsize, std::string name)
+void check_size(int fd, uint64_t *size, std::string name)
 {
-    int sect;
+    int sectsize;
     struct stat st;
     if (fstat(fd, &st) < 0)
     {
@@ -306,21 +228,14 @@ static void check_size(int fd, uint64_t *size, uint64_t *sectsize, std::string n
     if (S_ISREG(st.st_mode))
     {
         *size = st.st_size;
-        if (sectsize)
-        {
-            *sectsize = st.st_blksize;
-        }
     }
     else if (S_ISBLK(st.st_mode))
     {
-        if (ioctl(fd, BLKGETSIZE64, size) < 0 ||
+        if (ioctl(fd, BLKSSZGET, &sectsize) < 0 ||
-            ioctl(fd, BLKSSZGET, &sect) < 0)
+            ioctl(fd, BLKGETSIZE64, size) < 0 ||
+            sectsize != 512)
         {
-            throw std::runtime_error("failed to get "+name+" size or block size: "+strerror(errno));
+            throw std::runtime_error(name+" sector is not equal to 512 bytes");
-        }
-        if (sectsize)
-        {
-            *sectsize = sect;
         }
     }
     else
@@ -336,22 +251,11 @@ void blockstore_impl_t::open_data()
     {
         throw std::runtime_error("Failed to open data device");
     }
-    check_size(data_fd, &data_size, &data_device_sect, "data device");
+    check_size(data_fd, &data_size, "data device");
-    if (disk_alignment % data_device_sect)
-    {
-        throw std::runtime_error(
-            "disk_alignment ("+std::to_string(disk_alignment)+
-            ") is not a multiple of data device sector size ("+std::to_string(data_device_sect)+")"
-        );
-    }
     if (data_offset >= data_size)
     {
         throw std::runtime_error("data_offset exceeds device size = "+std::to_string(data_size));
     }
-    if (!disable_flock && flock(data_fd, LOCK_EX|LOCK_NB) != 0)
-    {
-        throw std::runtime_error(std::string("Failed to lock data device: ") + strerror(errno));
-    }
 }
 
 void blockstore_impl_t::open_meta()
@@ -364,33 +268,22 @@ void blockstore_impl_t::open_meta()
         {
             throw std::runtime_error("Failed to open metadata device");
         }
-        check_size(meta_fd, &meta_size, &meta_device_sect, "metadata device");
+        check_size(meta_fd, &meta_size, "metadata device");
         if (meta_offset >= meta_size)
         {
             throw std::runtime_error("meta_offset exceeds device size = "+std::to_string(meta_size));
         }
-        if (!disable_flock && flock(meta_fd, LOCK_EX|LOCK_NB) != 0)
-        {
-            throw std::runtime_error(std::string("Failed to lock metadata device: ") + strerror(errno));
-        }
     }
     else
     {
         meta_fd = data_fd;
-        meta_device_sect = data_device_sect;
+        disable_meta_fsync = disable_data_fsync;
         meta_size = 0;
         if (meta_offset >= data_size)
         {
             throw std::runtime_error("meta_offset exceeds device size = "+std::to_string(data_size));
         }
     }
-    if (meta_block_size % meta_device_sect)
-    {
-        throw std::runtime_error(
-            "meta_block_size ("+std::to_string(meta_block_size)+
-            ") is not a multiple of data device sector size ("+std::to_string(meta_device_sect)+")"
-        );
-    }
 }
 
 void blockstore_impl_t::open_journal()
@@ -402,16 +295,12 @@ void blockstore_impl_t::open_journal()
         {
             throw std::runtime_error("Failed to open journal device");
         }
-        check_size(journal.fd, &journal.device_size, &journal_device_sect, "journal device");
+        check_size(journal.fd, &journal.device_size, "metadata device");
-        if (!disable_flock && flock(journal.fd, LOCK_EX|LOCK_NB) != 0)
-        {
-            throw std::runtime_error(std::string("Failed to lock journal device: ") + strerror(errno));
-        }
     }
     else
     {
         journal.fd = meta_fd;
-        journal_device_sect = meta_device_sect;
+        disable_journal_fsync = disable_meta_fsync;
         journal.device_size = 0;
         if (journal.offset >= data_size)
         {
@@ -429,11 +318,4 @@ void blockstore_impl_t::open_journal()
         if (!journal.sector_buf)
             throw std::bad_alloc();
     }
-    if (journal_block_size % journal_device_sect)
-    {
-        throw std::runtime_error(
-            "journal_block_size ("+std::to_string(journal_block_size)+
-            ") is not a multiple of journal device sector size ("+std::to_string(journal_device_sect)+")"
-        );
-    }
 }

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,
@@ -11,10 +8,12 @@ int blockstore_impl_t::fulfill_read_push(blockstore_op_t *op, void *buf, uint64_
         // Zero-length version - skip
         return 1;
     }
-    else if (IS_IN_FLIGHT(item_state))
+    if (IS_IN_FLIGHT(item_state))
     {
-        // Write not finished yet - skip
+        // Pause until it's written somewhere
-        return 1;
+        PRIV(op)->wait_for = WAIT_IN_FLIGHT;
+        PRIV(op)->wait_detail = item_version;
+        return 0;
     }
     else if (IS_DELETE(item_state))
     {
@@ -24,7 +23,7 @@ int blockstore_impl_t::fulfill_read_push(blockstore_op_t *op, void *buf, uint64_
     }
     if (journal.inmemory && IS_JOURNAL(item_state))
     {
-        memcpy(buf, (uint8_t*)journal.buffer + offset, len);
+        memcpy(buf, journal.buffer + offset, len);
         return 1;
     }
     BS_SUBMIT_GET_SQE(sqe, data);
@@ -32,15 +31,15 @@ int blockstore_impl_t::fulfill_read_push(blockstore_op_t *op, void *buf, uint64_
     PRIV(op)->pending_ops++;
     my_uring_prep_readv(
         sqe,
-        IS_JOURNAL(item_state) ? journal.fd : data_fd,
+        IS_JOURNAL(item_state) ? journal_fd_index : data_fd_index,
         &data->iov, 1,
         (IS_JOURNAL(item_state) ? journal.offset : data_offset) + offset
     );
+    sqe->flags |= IOSQE_FIXED_FILE;
     data->callback = [this, op](ring_data_t *data) { handle_read_event(data, op); };
     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 +52,8 @@ 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 = {
@@ -75,7 +62,7 @@ int blockstore_impl_t::fulfill_read(blockstore_op_t *read_op, uint64_t &fulfille
                 };
                 it = PRIV(read_op)->read_vec.insert(it, el);
                 if (!fulfill_read_push(read_op,
-                    (uint8_t*)read_op->buf + el.offset - read_op->offset,
+                    read_op->buf + el.offset - read_op->offset,
                     item_location + el.offset - item_start,
                     el.len, item_state, item_version))
                 {
@@ -85,33 +72,14 @@ 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_db = clean_db_shard(read_op->oid);
     auto clean_it = clean_db.find(read_op->oid);
     auto dirty_it = dirty_db.upper_bound((obj_ver_id){
         .oid = read_op->oid,
@@ -128,7 +96,7 @@ 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;
@@ -150,11 +118,6 @@ 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)))
@@ -171,61 +134,63 @@ int blockstore_impl_t::dequeue_read(blockstore_op_t *read_op)
             dirty_it--;
         }
     }
-    if (clean_it != clean_db.end())
+    if (clean_it != clean_db.end() && fulfilled < read_op->len)
     {
         if (!result_version)
         {
             result_version = clean_it->second.version;
-            if (read_op->bitmap)
+        }
+        if (!clean_entry_bitmap_size)
+        {
+            if (!fulfill_read(read_op, fulfilled, 0, block_size, ST_CURRENT, 0, clean_it->second.location))
             {
-                void *bmp_ptr = get_clean_entry_bitmap(clean_it->second.location, clean_entry_bitmap_size);
+                // need to wait. undo added requests, don't dequeue op
-                memcpy(read_op->bitmap, bmp_ptr, clean_entry_bitmap_size);
+                PRIV(read_op)->read_vec.clear();
+                return 0;
             }
         }
-        if (fulfilled < read_op->len)
+        else
         {
-            if (!clean_entry_bitmap_size)
+            uint64_t meta_loc = clean_it->second.location >> block_order;
+            uint8_t *clean_entry_bitmap;
+            if (inmemory_meta)
             {
-                if (!fulfill_read(read_op, fulfilled, 0, block_size, (BS_ST_BIG_WRITE | BS_ST_STABLE), 0, clean_it->second.location))
+                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));
-                    // need to wait. undo added requests, don't dequeue op
+                clean_entry_bitmap = (uint8_t*)(metadata_buffer + sector + pos*clean_entry_size + sizeof(clean_disk_entry));
-                    PRIV(read_op)->read_vec.clear();
-                    return 0;
-                }
             }
             else
             {
-                uint8_t *clean_entry_bitmap = get_clean_entry_bitmap(clean_it->second.location, 0);
+                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)
+            uint64_t bmp_start = 0, bmp_end = 0, bmp_size = block_size/bitmap_granularity;
+            while (bmp_start < bmp_size)
+            {
+                while (!(clean_entry_bitmap[bmp_end >> 3] & (1 << (bmp_end & 0x7))) && bmp_end < bmp_size)
                 {
-                    while (!(clean_entry_bitmap[bmp_end >> 3] & (1 << (bmp_end & 0x7))) && bmp_end < bmp_size)
+                    bmp_end++;
+                }
+                if (bmp_end > bmp_start)
+                {
+                    // fill with zeroes
+                    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)
+                {
+                    bmp_end++;
+                }
+                if (bmp_end > bmp_start)
+                {
+                    if (!fulfill_read(read_op, fulfilled, bmp_start * bitmap_granularity,
+                        bmp_end * bitmap_granularity, ST_CURRENT, 0, clean_it->second.location + bmp_start * bitmap_granularity))
                     {
-                        bmp_end++;
+                        // need to wait. undo added requests, don't dequeue op
-                    }
+                        PRIV(read_op)->read_vec.clear();
-                    if (bmp_end > bmp_start)
+                        return 0;
-                    {
-                        // 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));
                     }
                     bmp_start = bmp_end;
-                    while (clean_entry_bitmap[bmp_end >> 3] & (1 << (bmp_end & 0x7)) && bmp_end < bmp_size)
-                    {
-                        bmp_end++;
-                    }
-                    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))
-                        {
-                            // need to wait. undo added requests, don't dequeue op
-                            PRIV(read_op)->read_vec.clear();
-                            return 0;
-                        }
-                        bmp_start = bmp_end;
-                    }
                 }
             }
         }
@@ -233,7 +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;
@@ -247,10 +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)
@@ -269,51 +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_db = clean_db_shard(oid);
-    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

@@ -0,0 +1,187 @@
+#include "blockstore_impl.h"
+
+int blockstore_impl_t::dequeue_rollback(blockstore_op_t *op)
+{
+    obj_ver_id* v;
+    int i, todo = op->len;
+    for (i = 0, v = (obj_ver_id*)op->buf; i < op->len; i++, 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){
+            .oid = v->oid,
+            .version = UINT64_MAX,
+        });
+        if (dirty_it == dirty_db.begin())
+        {
+        bad_op:
+            op->retval = -EINVAL;
+            FINISH_OP(op);
+            return 1;
+        }
+        else
+        {
+            dirty_it--;
+            if (dirty_it->first.oid != v->oid || dirty_it->first.version < v->version)
+            {
+                goto bad_op;
+            }
+            while (dirty_it->first.oid == v->oid && dirty_it->first.version > v->version)
+            {
+                if (!IS_SYNCED(dirty_it->second.state) ||
+                    IS_STABLE(dirty_it->second.state))
+                {
+                    goto bad_op;
+                }
+                if (dirty_it == dirty_db.begin())
+                {
+                    break;
+                }
+                dirty_it--;
+            }
+        }
+    }
+    // Check journal space
+    blockstore_journal_check_t space_check(this);
+    if (!space_check.check_available(op, todo, sizeof(journal_entry_rollback), 0))
+    {
+        return 0;
+    }
+    // There is sufficient space. Get SQEs
+    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_used_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 This is here only for the purpose of tracking unstable_writes. Remove if not required
+        // FIXME ...aaaand this is similar to blockstore_init.cpp - maybe dedup it?
+        auto dirty_it = dirty_db.lower_bound((obj_ver_id){
+            .oid = v->oid,
+            .version = UINT64_MAX,
+        });
+        uint64_t max_unstable = 0;
+        while (dirty_it != dirty_db.begin())
+        {
+            dirty_it--;
+            if (dirty_it->first.oid != v->oid)
+                break;
+            else if (dirty_it->first.version <= v->version)
+            {
+                if (!IS_STABLE(dirty_it->second.state))
+                    max_unstable = dirty_it->first.version;
+                break;
+            }
+        }
+        auto unstab_it = unstable_writes.find(v->oid);
+        if (unstab_it != unstable_writes.end())
+        {
+            if (max_unstable == 0)
+                unstable_writes.erase(unstab_it);
+            else
+                unstab_it->second = max_unstable;
+        }
+        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_used_journal_sector = 1 + journal.cur_sector;
+            cur_sector = journal.cur_sector;
+            prepare_journal_sector_write(journal, cur_sector, sqe[s++], cb);
+        }
+    }
+    PRIV(op)->max_used_journal_sector = 1 + journal.cur_sector;
+    PRIV(op)->pending_ops = s;
+    return 1;
+}
+
+void blockstore_impl_t::handle_rollback_event(ring_data_t *data, blockstore_op_t *op)
+{
+    live = true;
+    if (data->res != data->iov.iov_len)
+    {
+        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 used journal sectors
+        release_journal_sectors(op);
+        obj_ver_id* v;
+        int i;
+        for (i = 0, v = (obj_ver_id*)op->buf; i < op->len; i++, v++)
+        {
+            // Erase dirty_db entries
+            auto rm_end = dirty_db.lower_bound((obj_ver_id){
+                .oid = v->oid,
+                .version = UINT64_MAX,
+            });
+            rm_end--;
+            auto rm_start = rm_end;
+            while (1)
+            {
+                if (rm_end->first.oid != v->oid)
+                    break;
+                else if (rm_end->first.version <= v->version)
+                    break;
+                rm_start = rm_end;
+                if (rm_end == dirty_db.begin())
+                    break;
+                rm_end--;
+            }
+            if (rm_end != rm_start)
+                erase_dirty(rm_start, rm_end, UINT64_MAX);
+        }
+        journal.trim();
+        // Acknowledge op
+        op->retval = 0;
+        FINISH_OP(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)
+{
+    auto dirty_it = dirty_end;
+    while (dirty_it != dirty_start)
+    {
+        dirty_it--;
+        if (IS_BIG_WRITE(dirty_it->second.state) && dirty_it->second.location != clean_loc)
+        {
+#ifdef BLOCKSTORE_DEBUG
+            printf("Free block %lu\n", dirty_it->second.location >> block_order);
+#endif
+            data_alloc->set(dirty_it->second.location >> block_order, false);
+        }
+#ifdef BLOCKSTORE_DEBUG
+        printf("remove usage of journal offset %lu by %lu:%lu v%lu\n", dirty_it->second.journal_sector,
+            dirty_it->first.oid.inode, dirty_it->first.oid.stripe, dirty_it->first.version);
+#endif
+        int used = --journal.used_sectors[dirty_it->second.journal_sector];
+        if (used == 0)
+        {
+            journal.used_sectors.erase(dirty_it->second.journal_sector);
+        }
+    }
+    dirty_db.erase(dirty_start, dirty_end);
+}

blockstore_stable.cpp

@@ -0,0 +1,195 @@
+#include "blockstore_impl.h"
+
+// Stabilize small write:
+// 1) Copy data from the journal to the data device
+// 2) Increase version on the metadata device and sync it
+// 3) Advance clean_db entry's version, clear previous journal entries
+//
+// This makes 1 4K small write+sync look like:
+// 512b+4K (journal) + sync + 512b (journal) + sync + 4K (data) [+ sync?] + 512b (metadata) + sync.
+// WA = 2.375. It's not the best, SSD FTL-like redirect-write could probably be lower
+// even with defragmentation. But it's fixed and it's still better than in Ceph. :)
+// except for HDD-only clusters, because each write results in 3 seeks.
+
+// Stabilize big write:
+// 1) Copy metadata from the journal to the metadata device
+// 2) Move dirty_db entry to clean_db and clear previous journal entries
+//
+// This makes 1 128K big write+sync look like:
+// 128K (data) + sync + 512b (journal) + sync + 512b (journal) + sync + 512b (metadata) + sync.
+// WA = 1.012. Very good :)
+
+// Stabilize delete:
+// 1) Remove metadata entry and sync it
+// 2) Remove dirty_db entry and clear previous journal entries
+// We have 2 problems here:
+// - In the cluster environment, we must store the "tombstones" of deleted objects until
+//   all replicas (not just quorum) agrees about their deletion. That is, "stabilize" is
+//   not possible for deletes in degraded placement groups
+// - With simple "fixed" metadata tables we can't just clear the metadata entry of the latest
+//   object version. We must clear all previous entries, too.
+// FIXME Fix both problems - probably, by switching from "fixed" metadata tables to "dynamic"
+
+// AND We must do it in batches, for the sake of reduced fsync call count
+// AND We must know what we stabilize. Basic workflow is like:
+// 1) primary OSD receives sync request
+// 2) it submits syncs to blockstore and peers
+// 3) after everyone acks sync it acks sync to the client
+// 4) after a while it takes his synced object list and sends stabilize requests
+//    to peers and to its own blockstore, thus freeing the old version
+
+int blockstore_impl_t::dequeue_stable(blockstore_op_t *op)
+{
+    obj_ver_id* v;
+    int i, todo = 0;
+    for (i = 0, v = (obj_ver_id*)op->buf; i < op->len; i++, v++)
+    {
+        auto dirty_it = dirty_db.find(*v);
+        if (dirty_it == dirty_db.end())
+        {
+            auto clean_it = clean_db.find(v->oid);
+            if (clean_it == clean_db.end() || clean_it->second.version < v->version)
+            {
+                // No such object version
+                op->retval = -EINVAL;
+                FINISH_OP(op);
+                return 1;
+            }
+            else
+            {
+                // Already stable
+            }
+        }
+        else if (IS_UNSYNCED(dirty_it->second.state))
+        {
+            // Object not synced yet. Caller must sync it first
+            op->retval = EAGAIN;
+            FINISH_OP(op);
+            return 1;
+        }
+        else if (!IS_STABLE(dirty_it->second.state))
+        {
+            todo++;
+        }
+    }
+    if (!todo)
+    {
+        // Already stable
+        op->retval = 0;
+        FINISH_OP(op);
+        return 1;
+    }
+    // Check journal space
+    blockstore_journal_check_t space_check(this);
+    if (!space_check.check_available(op, todo, sizeof(journal_entry_stable), 0))
+    {
+        return 0;
+    }
+    // There is sufficient space. Get SQEs
+    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_used_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++)
+    {
+        auto unstab_it = unstable_writes.find(v->oid);
+        if (unstab_it != unstable_writes.end() &&
+            unstab_it->second <= v->version)
+        {
+            unstable_writes.erase(unstab_it);
+        }
+        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_used_journal_sector = 1 + journal.cur_sector;
+            cur_sector = journal.cur_sector;
+            prepare_journal_sector_write(journal, cur_sector, sqe[s++], cb);
+        }
+    }
+    PRIV(op)->max_used_journal_sector = 1 + journal.cur_sector;
+    PRIV(op)->pending_ops = s;
+    return 1;
+}
+
+void blockstore_impl_t::handle_stable_event(ring_data_t *data, blockstore_op_t *op)
+{
+    live = true;
+    if (data->res != data->iov.iov_len)
+    {
+        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 used journal sectors
+        release_journal_sectors(op);
+        // Mark dirty_db entries as stable, acknowledge op completion
+        obj_ver_id* v;
+        int i;
+        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
+            auto dirty_it = dirty_db.find(*v);
+            if (dirty_it != dirty_db.end())
+            {
+                while (1)
+                {
+                    if (dirty_it->second.state == ST_J_SYNCED)
+                    {
+                        dirty_it->second.state = ST_J_STABLE;
+                    }
+                    else if (dirty_it->second.state == ST_D_META_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))
+                    {
+                        break;
+                    }
+                    if (dirty_it == dirty_db.begin())
+                    {
+                        break;
+                    }
+                    dirty_it--;
+                    if (dirty_it->first.oid != v->oid)
+                    {
+                        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);
+            }
+        }
+        // Acknowledge op
+        op->retval = 0;
+        FINISH_OP(op);
+    }
+}

blockstore_sync.cpp

@@ -0,0 +1,271 @@
+#include "blockstore_impl.h"
+
+#define SYNC_HAS_SMALL 1
+#define SYNC_HAS_BIG 2
+#define SYNC_DATA_SYNC_SENT 3
+#define SYNC_DATA_SYNC_DONE 4
+#define SYNC_JOURNAL_WRITE_SENT 5
+#define SYNC_JOURNAL_WRITE_DONE 6
+#define SYNC_JOURNAL_SYNC_SENT 7
+#define SYNC_DONE 8
+
+int blockstore_impl_t::dequeue_sync(blockstore_op_t *op)
+{
+    if (PRIV(op)->sync_state == 0)
+    {
+        stop_sync_submitted = false;
+        PRIV(op)->sync_big_writes.swap(unsynced_big_writes);
+        PRIV(op)->sync_small_writes.swap(unsynced_small_writes);
+        PRIV(op)->sync_small_checked = 0;
+        PRIV(op)->sync_big_checked = 0;
+        unsynced_big_writes.clear();
+        unsynced_small_writes.clear();
+        if (PRIV(op)->sync_big_writes.size() > 0)
+            PRIV(op)->sync_state = SYNC_HAS_BIG;
+        else if (PRIV(op)->sync_small_writes.size() > 0)
+            PRIV(op)->sync_state = SYNC_HAS_SMALL;
+        else
+            PRIV(op)->sync_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)->sync_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, cb);
+            PRIV(op)->min_used_journal_sector = PRIV(op)->max_used_journal_sector = 1 + journal.cur_sector;
+            PRIV(op)->pending_ops = 1;
+            PRIV(op)->sync_state = SYNC_JOURNAL_WRITE_SENT;
+            return 1;
+        }
+        else
+        {
+            PRIV(op)->sync_state = SYNC_JOURNAL_WRITE_DONE;
+        }
+    }
+    if (PRIV(op)->sync_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_index, IORING_FSYNC_DATASYNC);
+            sqe->flags |= IOSQE_FIXED_FILE;
+            data->iov = { 0 };
+            data->callback = cb;
+            PRIV(op)->min_used_journal_sector = PRIV(op)->max_used_journal_sector = 0;
+            PRIV(op)->pending_ops = 1;
+            PRIV(op)->sync_state = SYNC_DATA_SYNC_SENT;
+            return 1;
+        }
+        else
+        {
+            PRIV(op)->sync_state = SYNC_DATA_SYNC_DONE;
+        }
+    }
+    if (PRIV(op)->sync_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), 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_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_used_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())
+        {
+            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 %lu is used by %lu:%lu v%lu\n", dirty_db[*it].journal_sector, it->oid.inode, it->oid.stripe, it->version);
+#endif
+            je->oid = it->oid;
+            je->version = it->version;
+            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_used_journal_sector = 1 + journal.cur_sector;
+                cur_sector = journal.cur_sector;
+                prepare_journal_sector_write(journal, cur_sector, sqe[s++], cb);
+            }
+        }
+        PRIV(op)->max_used_journal_sector = 1 + journal.cur_sector;
+        PRIV(op)->pending_ops = s;
+        PRIV(op)->sync_state = SYNC_JOURNAL_WRITE_SENT;
+        return 1;
+    }
+    if (PRIV(op)->sync_state == SYNC_JOURNAL_WRITE_DONE)
+    {
+        if (!disable_journal_fsync)
+        {
+            BS_SUBMIT_GET_SQE(sqe, data);
+            my_uring_prep_fsync(sqe, journal_fd_index, IORING_FSYNC_DATASYNC);
+            sqe->flags |= IOSQE_FIXED_FILE;
+            data->iov = { 0 };
+            data->callback = cb;
+            PRIV(op)->pending_ops = 1;
+            PRIV(op)->sync_state = SYNC_JOURNAL_SYNC_SENT;
+            return 1;
+        }
+        else
+        {
+            PRIV(op)->sync_state = SYNC_DONE;
+        }
+    }
+    if (PRIV(op)->sync_state == SYNC_DONE)
+    {
+        ack_sync(op);
+    }
+    return 1;
+}
+
+void blockstore_impl_t::handle_sync_event(ring_data_t *data, blockstore_op_t *op)
+{
+    live = true;
+    if (data->res != data->iov.iov_len)
+    {
+        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 used journal sectors
+        release_journal_sectors(op);
+        // Handle states
+        if (PRIV(op)->sync_state == SYNC_DATA_SYNC_SENT)
+        {
+            PRIV(op)->sync_state = SYNC_DATA_SYNC_DONE;
+        }
+        else if (PRIV(op)->sync_state == SYNC_JOURNAL_WRITE_SENT)
+        {
+            PRIV(op)->sync_state = SYNC_JOURNAL_WRITE_DONE;
+        }
+        else if (PRIV(op)->sync_state == SYNC_JOURNAL_SYNC_SENT)
+        {
+            PRIV(op)->sync_state = SYNC_DONE;
+            ack_sync(op);
+        }
+        else
+        {
+            throw std::runtime_error("BUG: unexpected sync op state");
+        }
+    }
+}
+
+int blockstore_impl_t::ack_sync(blockstore_op_t *op)
+{
+    if (PRIV(op)->sync_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)->sync_state == SYNC_DONE)
+            {
+                done_syncs++;
+                // Acknowledge next_sync
+                ack_one_sync(next_sync);
+            }
+        }
+        return 1;
+    }
+    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 %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;
+        dirty_db[*it].state = ST_D_META_SYNCED;
+    }
+    for (auto it = PRIV(op)->sync_small_writes.begin(); it != PRIV(op)->sync_small_writes.end(); it++)
+    {
+#ifdef BLOCKSTORE_DEBUG
+        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;
+        dirty_db[*it].state = dirty_db[*it].state == ST_DEL_WRITTEN ? ST_DEL_SYNCED : ST_J_SYNCED;
+    }
+    in_progress_syncs.erase(PRIV(op)->in_progress_ptr);
+    op->retval = 0;
+    FINISH_OP(op);
+}

blockstore_write.cpp

@@ -0,0 +1,330 @@
+#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);
+    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);
+        }
+    }
+    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 = -EINVAL;
+        return false;
+    }
+    if (deleted && is_del)
+    {
+        // Already deleted
+        op->retval = 0;
+        return false;
+    }
+    // Immediately add the operation into dirty_db, so subsequent reads could see it
+#ifdef BLOCKSTORE_DEBUG
+    printf("%s %lu:%lu v%lu\n", is_del ? "Delete" : "Write", op->oid.inode, op->oid.stripe, op->version);
+#endif
+    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 : 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)
+{
+    auto dirty_it = dirty_db.find((obj_ver_id){
+        .oid = op->oid,
+        .version = op->version,
+    });
+    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_index, PRIV(op)->iov_zerofill, vcnt, data_offset + (loc << block_order) + op->offset - stripe_offset
+        );
+        sqe->flags |= IOSQE_FIXED_FILE;
+        PRIV(op)->pending_ops = 1;
+        PRIV(op)->min_used_journal_sector = PRIV(op)->max_used_journal_sector = 0;
+        // Remember big write as unsynced
+        unsynced_big_writes.push_back((obj_ver_id){
+            .oid = op->oid,
+            .version = op->version,
+        });
+    }
+    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 ((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
+            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 (sqe1)
+        {
+            prepare_journal_sector_write(journal, journal.cur_sector, sqe1, cb);
+            // FIXME rename to min/max _flushing
+            PRIV(op)->min_used_journal_sector = PRIV(op)->max_used_journal_sector = 1 + journal.cur_sector;
+            PRIV(op)->pending_ops++;
+        }
+        else
+        {
+            PRIV(op)->min_used_journal_sector = PRIV(op)->max_used_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 %lu is used by %lu:%lu v%lu\n", dirty_it->second.journal_sector, dirty_it->first.oid.inode, dirty_it->first.oid.stripe, dirty_it->first.version);
+#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 (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_index, &data2->iov, 1, journal.offset + journal.next_free
+            );
+            sqe2->flags |= IOSQE_FIXED_FILE;
+            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;
+        }
+        // Remember small write as unsynced
+        unsynced_small_writes.push_back((obj_ver_id){
+            .oid = op->oid,
+            .version = op->version,
+        });
+        if (!PRIV(op)->pending_ops)
+        {
+            ack_write(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)
+    {
+        // 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);
+        ack_write(op);
+    }
+}
+
+void blockstore_impl_t::release_journal_sectors(blockstore_op_t *op)
+{
+    // Release used journal sectors
+    if (PRIV(op)->min_used_journal_sector > 0 &&
+        PRIV(op)->max_used_journal_sector > 0)
+    {
+        uint64_t s = PRIV(op)->min_used_journal_sector;
+        while (1)
+        {
+            journal.sector_info[s-1].usage_count--;
+            if (s == PRIV(op)->max_used_journal_sector)
+                break;
+            s = 1 + s % journal.sector_count;
+        }
+        PRIV(op)->min_used_journal_sector = PRIV(op)->max_used_journal_sector = 0;
+    }
+}
+
+void blockstore_impl_t::ack_write(blockstore_op_t *op)
+{
+    // Switch object state
+    auto & dirty_entry = dirty_db[(obj_ver_id){
+        .oid = op->oid,
+        .version = op->version,
+    }];
+#ifdef BLOCKSTORE_DEBUG
+    printf("Ack write %lu:%lu v%lu = %d\n", op->oid.inode, op->oid.stripe, op->version, dirty_entry.state);
+#endif
+    if (dirty_entry.state == ST_J_SUBMITTED)
+    {
+        dirty_entry.state = ST_J_WRITTEN;
+    }
+    else if (dirty_entry.state == ST_D_SUBMITTED)
+    {
+        dirty_entry.state = ST_D_WRITTEN;
+    }
+    else if (dirty_entry.state == ST_DEL_SUBMITTED)
+    {
+        dirty_entry.state = ST_DEL_WRITTEN;
+    }
+    // Acknowledge write without sync
+    op->retval = op->len;
+    FINISH_OP(op);
+}
+
+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,
+    });
+    blockstore_journal_check_t space_check(this);
+    if (!space_check.check_available(op, 1, sizeof(journal_entry_del), 0))
+    {
+        return 0;
+    }
+    BS_SUBMIT_GET_ONLY_SQE(sqe);
+    // Prepare journal sector write
+    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 %lu is used by %lu:%lu v%lu\n", dirty_it->second.journal_sector, dirty_it->first.oid.inode, dirty_it->first.oid.stripe, dirty_it->first.version);
+#endif
+    je->oid = op->oid;
+    je->version = op->version;
+    je->crc32 = je_crc32((journal_entry*)je);
+    journal.crc32_last = je->crc32;
+    auto cb = [this, op](ring_data_t *data) { handle_write_event(data, op); };
+    prepare_journal_sector_write(journal, journal.cur_sector, sqe, cb);
+    PRIV(op)->min_used_journal_sector = PRIV(op)->max_used_journal_sector = 1 + journal.cur_sector;
+    PRIV(op)->pending_ops = 1;
+    dirty_it->second.state = ST_DEL_SUBMITTED;
+    // Remember small write as unsynced
+    unsynced_small_writes.push_back((obj_ver_id){
+        .oid = op->oid,
+        .version = op->version,
+    });
+    return 1;
+}

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 45e6d1f13196a0824e2089a586c53b9de0283f17

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

@@ -1,2 +0,0 @@
-vitastor-csi
-Dockerfile

csi/Dockerfile

@@ -1,32 +0,0 @@
-# Compile stage
-FROM golang:buster AS build
-
-ADD go.sum 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 ?= v0.6.17
-
-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:v0.6.17
-          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:v0.6.17
-          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-block.yaml

@@ -1,13 +0,0 @@
----
-apiVersion: v1
-kind: PersistentVolumeClaim
-metadata:
-  name: test-vitastor-pvc-block
-spec:
-  storageClassName: vitastor
-  volumeMode: Block
-  accessModes:
-    - ReadWriteMany
-  resources:
-    requests:
-      storage: 10Gi

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/deploy/example-test-pod-block.yaml

@@ -1,17 +0,0 @@
-apiVersion: v1
-kind: Pod
-metadata:
-  name: vitastor-test-block-pvc
-  namespace: default
-spec:
-  containers:
-  - name: vitastor-test-block-pvc
-    image: nginx
-    volumeDevices:
-      - name: data
-        devicePath: /dev/xvda
-  volumes:
-  - name: data
-    persistentVolumeClaim:
-      claimName: test-vitastor-pvc-block
-      readOnly: false

csi/deploy/example-test-pod.yaml

@@ -1,17 +0,0 @@
-apiVersion: v1
-kind: Pod
-metadata:
-  name: vitastor-test-nginx
-  namespace: default
-spec:
-  containers:
-   - name: vitastor-test-nginx
-     image: nginx
-     volumeMounts:
-       - mountPath: /usr/share/nginx/html/s3
-         name: data
-  volumes:
-   - name: data
-     persistentVolumeClaim:
-       claimName: test-vitastor-pvc
-       readOnly: false

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/go.sum

@@ -1,448 +0,0 @@
-cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
-cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
-cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
-cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
-cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
-cloud.google.com/go v0.51.0/go.mod h1:hWtGJ6gnXH+KgDv+V0zFGDvpi07n3z8ZNj3T1RW0Gcw=
-cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
-cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
-cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
-cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
-dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
-github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78/go.mod h1:LmzpDX56iTiv29bbRTIsUNlaFfuhWRQBWjQdVyAevI8=
-github.com/Azure/go-autorest/autorest v0.9.0/go.mod h1:xyHB1BMZT0cuDHU7I0+g046+BFDTQ8rEZB0s4Yfa6bI=
-github.com/Azure/go-autorest/autorest v0.9.6/go.mod h1:/FALq9T/kS7b5J5qsQ+RSTUdAmGFqi0vUdVNNx8q630=
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-github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY=
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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 = "0.6.17"
-)
-
-// 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-cli
-    args := []string{
-        "rm-data", "--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-cli", args...)
-    var stderr bytes.Buffer
-    c.Stdout = nil
-    c.Stderr = &stderr
-    err = c.Run()
-    stderrStr := string(stderr.Bytes())
-    if (err != nil)
-    {
-        klog.Errorf("vitastor-cli rm-data 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

@@ -1,293 +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()
-    isBlock := req.GetVolumeCapability().GetBlock() != nil
-
-    // Check that it's not already mounted
-    _, error := mount.IsNotMountPoint(ns.mounter, targetPath)
-    if (error != nil)
-    {
-        if (os.IsNotExist(error))
-        {
-            if (isBlock)
-            {
-                pathFile, err := os.OpenFile(targetPath, os.O_CREATE|os.O_RDWR, 0o600)
-                if (err != nil)
-                {
-                    klog.Errorf("failed to create block device mount target %s with error: %v", targetPath, err)
-                    return nil, status.Error(codes.Internal, err.Error())
-                }
-                err = pathFile.Close()
-                if (err != nil)
-                {
-                    klog.Errorf("failed to close %s with error: %v", targetPath, err)
-                    return nil, status.Error(codes.Internal, err.Error())
-                }
-            }
-            else
-            {
-                err := os.MkdirAll(targetPath, 0777)
-                if (err != nil)
-                {
-                    klog.Errorf("failed to create fs mount target %s with error: %v", targetPath, err)
-                    return nil, status.Error(codes.Internal, err.Error())
-                }
-            }
-        }
-        else
-        {
-            return nil, status.Error(codes.Internal, error.Error())
-        }
-    }
-
-    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()
-    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
-
-cat < vitastor.Dockerfile > ../Dockerfile
-cd ..
-mkdir -p packages
-sudo podman build --build-arg REL=bullseye -v `pwd`/packages:/root/packages -f Dockerfile .
-rm Dockerfile

debian/build-vitastor-buster.sh

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

debian/changelog

@@ -1,27 +0,0 @@
-vitastor (0.6.17-1) 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

@@ -1,55 +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: vitastor-osd, vitastor-mon, vitastor-client, vitastor-client-dev, vitastor-fio
-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).
-
-Package: vitastor-osd
-Architecture: amd64
-Depends: ${shlibs:Depends}, ${misc:Depends}, vitastor-client (= ${binary:Version})
-Description: Vitastor, a fast software-defined clustered block storage - object storage daemon
- Vitastor object storage daemon, i.e. server program that stores data.
-
-Package: vitastor-mon
-Architecture: amd64
-Depends: ${misc:Depends}, nodejs (>= 10), node-sprintf-js, node-ws (>= 7), lp-solve
-Description: Vitastor, a fast software-defined clustered block storage - monitor
- Vitastor monitor, i.e. server program responsible for watching cluster state and
- scheduling cluster-level operations.
-
-Package: vitastor-client
-Architecture: amd64
-Depends: ${shlibs:Depends}, ${misc:Depends}
-Description: Vitastor, a fast software-defined clustered block storage - client
- Vitastor client library and command-line interface.
-
-Package: vitastor-client-dev
-Section: devel
-Architecture: amd64
-Depends: ${misc:Depends}, vitastor-client (= ${binary:Version})
-Description: Vitastor, a fast software-defined clustered block storage - development files
- Vitastor library headers for development.
-
-Package: vitastor-fio
-Architecture: amd64
-Depends: ${shlibs:Depends}, ${misc:Depends}, vitastor-client (= ${binary:Version}), fio (= ${dep:fio})
-Description: Vitastor, a fast software-defined clustered block storage - fio drivers
- Vitastor fio drivers for benchmarking.
-
-Package: pve-storage-vitastor
-Architecture: amd64
-Depends: ${shlibs:Depends}, ${misc:Depends}, vitastor-client (= ${binary:Version})
-Description: Vitastor Proxmox Virtual Environment storage plugin
- Vitastor storage plugin for Proxmox Virtual Environment.

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/fio_version

@@ -1 +0,0 @@
-dep:fio=3.16-1

debian/install

@@ -1,4 +0,0 @@
-VNPL-1.1.txt usr/share/doc/vitastor
-GPL-2.0.txt usr/share/doc/vitastor
-README.md usr/share/doc/vitastor
-README-ru.md usr/share/doc/vitastor

debian/libvirt.Dockerfile

@@ -1,40 +0,0 @@
-# Build patched libvirt for Debian Buster or Bullseye/Sid inside a container
-# cd ..; podman build --build-arg REL=bullseye -v `pwd`/packages:/root/packages -f debian/libvirt.Dockerfile .
-
-ARG REL=
-FROM debian:$REL
-ARG REL=
-
-WORKDIR /root
-
-RUN if [ "$REL" = "buster" -o "$REL" = "bullseye" ]; then \
-        echo "deb http://deb.debian.org/debian $REL-backports main" >> /etc/apt/sources.list; \
-        echo >> /etc/apt/preferences; \
-        echo 'Package: *' >> /etc/apt/preferences; \
-        echo "Pin: release a=$REL-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; apt-get -y install devscripts
-RUN apt-get -y build-dep libvirt0
-RUN apt-get -y install libglusterfs-dev
-RUN apt-get --download-only source libvirt
-
-ADD patches/libvirt-5.0-vitastor.diff patches/libvirt-7.0-vitastor.diff patches/libvirt-7.5-vitastor.diff patches/libvirt-7.6-vitastor.diff /root
-RUN set -e; \
-    mkdir -p /root/packages/libvirt-$REL; \
-    rm -rf /root/packages/libvirt-$REL/*; \
-    cd /root/packages/libvirt-$REL; \
-    dpkg-source -x /root/libvirt*.dsc; \
-    D=$(ls -d libvirt-*/); \
-    V=$(ls -d libvirt-*/ | perl -pe 's/libvirt-(\d+\.\d+).*/$1/'); \
-    cp /root/libvirt-$V-vitastor.diff $D/debian/patches; \
-    echo libvirt-$V-vitastor.diff >> $D/debian/patches/series; \
-    cd $D; \
-    V=$(head -n1 debian/changelog | perl -pe 's/^.*\((.*?)(~bpo[\d\+]*)?(\+deb[u\d]+)?\).*$/$1/')+vitastor2; \
-    DEBEMAIL="Vitaliy Filippov <vitalif@yourcmc.ru>" dch -D $REL -v $V 'Add Vitastor support'; \
-    DEB_BUILD_OPTIONS=nocheck dpkg-buildpackage --jobs=auto -sa; \
-    rm -rf /root/packages/libvirt-$REL/$D

debian/patched-qemu.Dockerfile

@@ -1,61 +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 .
-
-ARG REL=
-FROM debian:$REL
-ARG REL=
-
-WORKDIR /root
-
-RUN if [ "$REL" = "buster" -o "$REL" = "bullseye" ]; then \
-        echo "deb http://deb.debian.org/debian $REL-backports main" >> /etc/apt/sources.list; \
-        echo >> /etc/apt/preferences; \
-        echo 'Package: *' >> /etc/apt/preferences; \
-        echo "Pin: release a=$REL-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
-# To build a custom version
-#RUN cp /root/packages/qemu-orig/* /root
-RUN apt-get --download-only source qemu
-
-ADD patches/qemu-5.0-vitastor.patch patches/qemu-5.1-vitastor.patch patches/qemu-6.1-vitastor.patch src/qemu_driver.c /root/vitastor/patches/
-RUN set -e; \
-    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 $REL main > /etc/apt/sources.list.d/vitastor.list); \
-    (echo "APT::Install-Recommends false;" > /etc/apt/apt.conf) && \
-    apt-get update; \
-    apt-get install -y vitastor-client vitastor-client-dev quilt; \
-    mkdir -p /root/packages/qemu-$REL; \
-    rm -rf /root/packages/qemu-$REL/*; \
-    cd /root/packages/qemu-$REL; \
-    dpkg-source -x /root/qemu*.dsc; \
-    if ls -d /root/packages/qemu-$REL/qemu-5.0*; then \
-        D=$(ls -d /root/packages/qemu-$REL/qemu-5.0*); \
-        cp /root/vitastor/patches/qemu-5.0-vitastor.patch $D/debian/patches; \
-        echo qemu-5.0-vitastor.patch >> $D/debian/patches/series; \
-    elif ls /root/packages/qemu-$REL/qemu-6.1*; then \
-        D=$(ls -d /root/packages/qemu-$REL/qemu-6.1*); \
-        cp /root/vitastor/patches/qemu-6.1-vitastor.patch $D/debian/patches; \
-        echo qemu-6.1-vitastor.patch >> $D/debian/patches/series; \
-    else \
-        cp /root/vitastor/patches/qemu-5.1-vitastor.patch /root/packages/qemu-$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-*/; \
-    quilt push -a; \
-    quilt add block/vitastor.c; \
-    cp /root/vitastor/patches/qemu_driver.c block/vitastor.c; \
-    quilt refresh; \
-    V=$(head -n1 debian/changelog | perl -pe 's/^.*\((.*?)(~bpo[\d\+]*)?\).*$/$1/')+vitastor1; \
-    DEBEMAIL="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/pve-storage-vitastor.install

@@ -1 +0,0 @@
-patches/PVE_VitastorPlugin.pm usr/share/perl5/PVE/Storage/Custom/VitastorPlugin.pm

debian/raw.h

@@ -1,19 +0,0 @@
-/* Removed in Linux 5.14 */
-
-/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
-#ifndef __LINUX_RAW_H
-#define __LINUX_RAW_H
-
-#include <linux/types.h>
-
-#define RAW_SETBIND	_IO( 0xac, 0 )
-#define RAW_GETBIND	_IO( 0xac, 1 )
-
-struct raw_config_request 
-{
-	int	raw_minor;
-	__u64	block_major;
-	__u64	block_minor;
-};
-
-#endif /* __LINUX_RAW_H */

debian/rules

@@ -1,10 +0,0 @@
-#!/usr/bin/make -f
-export DH_VERBOSE = 1
-
-%:
-	dh $@
-
-override_dh_installdeb:
-	cat debian/fio_version >> debian/vitastor-fio.substvars
-	[ -f debian/qemu_version ] && (cat debian/qemu_version >> debian/vitastor-qemu.substvars) || true
-	dh_installdeb

debian/source/format

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

debian/vitastor-client-dev.install

@@ -1,2 +0,0 @@
-usr/include
-usr/lib/*/pkgconfig

debian/vitastor-client.install

@@ -1,7 +0,0 @@
-usr/bin/vita
-usr/bin/vitastor-cli
-usr/bin/vitastor-rm
-usr/bin/vitastor-nbd
-usr/bin/vitastor-nfs
-usr/lib/*/libvitastor*.so*
-mon/make-osd.sh /usr/lib/vitastor

debian/vitastor-fio.install

@@ -1 +0,0 @@
-usr/lib/*/libfio*.so*

debian/vitastor-mon.install

@@ -1 +0,0 @@
-mon usr/lib/vitastor

debian/vitastor-osd.install

@@ -1,2 +0,0 @@
-usr/bin/vitastor-osd
-usr/bin/vitastor-dump-journal

debian/vitastor.Dockerfile

@@ -1,55 +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 .
-
-ARG REL=
-FROM debian:$REL
-ARG REL=
-
-WORKDIR /root
-
-RUN if [ "$REL" = "buster" -o "$REL" = "bullseye" ]; then \
-        echo "deb http://deb.debian.org/debian $REL-backports main" >> /etc/apt/sources.list; \
-        echo >> /etc/apt/preferences; \
-        echo 'Package: *' >> /etc/apt/preferences; \
-        echo "Pin: release a=$REL-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 fio liburing1 liburing-dev libgoogle-perftools-dev devscripts
-RUN apt-get -y build-dep fio
-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; \
-    mkdir -p /root/packages/vitastor-$REL; \
-    rm -rf /root/packages/vitastor-$REL/*; \
-    cd /root/packages/vitastor-$REL; \
-    cp -r /root/vitastor vitastor-0.6.17; \
-    cd vitastor-0.6.17; \
-    ln -s /root/fio-build/fio-*/ ./fio; \
-    FIO=$(head -n1 fio/debian/changelog | perl -pe 's/^.*\((.*?)\).*$/$1/'); \
-    ls /usr/include/linux/raw.h || cp ./debian/raw.h /usr/include/linux/raw.h; \
-    sh copy-fio-includes.sh; \
-    rm fio; \
-    mkdir -p a b debian/patches; \
-    mv fio-copy b/fio; \
-    diff -NaurpbB a b > debian/patches/fio-headers.patch || true; \
-    echo fio-headers.patch >> debian/patches/series; \
-    rm -rf a b; \
-    echo "dep:fio=$FIO" > debian/fio_version; \
-    cd /root/packages/vitastor-$REL; \
-    tar --sort=name --mtime='2020-01-01' --owner=0 --group=0 --exclude=debian -cJf vitastor_0.6.17.orig.tar.xz vitastor-0.6.17; \
-    cd vitastor-0.6.17; \
-    V=$(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-*/

docker/Dockerfile

@@ -1,9 +0,0 @@
-# Build Docker image with Vitastor packages
-
-FROM debian:bullseye
-
-ADD vitastor.list /etc/apt/sources.list.d
-ADD vitastor.gpg /etc/apt/trusted.gpg.d
-ADD vitastor.pref /etc/apt/preferences.d
-ADD apt.conf /etc/apt/
-RUN apt-get update && apt-get -y install vitastor qemu-system-x86 qemu-system-common && apt-get clean

docker/apt.conf

@@ -1 +0,0 @@
-APT::Install-Recommends false;

docker/vitastor.list

@@ -1 +0,0 @@
-deb http://vitastor.io/debian bullseye main

docker/vitastor.pref

@@ -1,3 +0,0 @@
-Package: *
-Pin: origin "vitastor.io"
-Pin-Priority: 1000

docs/config.en.md

@@ -1,37 +0,0 @@
-[Documentation](../README.md#documentation) → Configuration Reference
-
------
-
-[Читать на русском](config.ru.md)
-
-# Configuration Reference
-
-Vitastor configuration consists of:
-- [Configuration parameters (key-value)](#parameter-reference)
-- [Pool configuration](config/pool.en.md)
-- [OSD placement tree configuration](config/pool.en.md#placement-tree)
-- [Separate OSD settings](config/pool.en.md#osd-settings)
-- [Inode configuration](config/inode.en.md) i.e. image metadata like name, size and parent reference
-
-Configuration parameters can be set in 3 places:
-- Configuration file (`/etc/vitastor/vitastor.conf` or other path)
-- etcd key `/vitastor/config/global`. Most variables can be set there, but etcd
-  connection parameters should obviously be set in the configuration file.
-- Command line of Vitastor components: OSD, mon, fio and QEMU options,
-  OpenStack/Proxmox/etc configuration. The latter doesn't allow to set all
-  variables directly, but it allows to override the configuration file and
-  set everything you need inside it.
-
-In the future, additional configuration methods may be added:
-- OSD superblock which will, by design, contain parameters related to the disk
-  layout and to one specific OSD.
-- OSD-specific keys in etcd like `/vitastor/config/osd/<number>`.
-
-## Parameter Reference
-
-- [Common](config/common.en.md)
-- [Network](config/network.en.md)
-- [Global Disk Layout](config/layout-cluster.en.md)
-- [OSD Disk Layout](config/layout-osd.en.md)
-- [OSD Runtime Parameters](config/osd.en.md)
-- [Monitor](config/monitor.en.md)

docs/config.ru.md

@@ -1,39 +0,0 @@
-[Документация](../README-ru.md#документация) → Конфигурация Vitastor
-
------
-
-[Read in English](config.en.md)
-
-# Конфигурация Vitastor
-
-Конфигурация Vitastor состоит из:
-- [Параметров (ключ-значение)](#список-параметров)
-- [Настроек пулов](config/pool.ru.md)
-- [Настроек дерева OSD](config/pool.ru.md#дерево-размещения)
-- [Настроек отдельных OSD](config/pool.ru.md#настройки-osd)
-- [Настроек инодов](config/inode.ru.md), т.е. метаданных образов, таких, как имя, размер и ссылки на
-  родительский образ
-
-Параметры конфигурации могут задаваться в 3 местах:
-- Файле конфигурации (`/etc/vitastor/vitastor.conf` или по другому пути)
-- Ключе в etcd `/vitastor/config/global`. Большая часть параметров может
-  задаваться там, кроме, естественно, самих параметров соединения с etcd,
-  которые должны задаваться в файле конфигурации
-- В командной строке компонентов Vitastor: OSD, монитора, опциях fio и QEMU,
-  настроек OpenStack, Proxmox и т.п. Последние, как правило, не включают полный
-  набор параметров напрямую, но разрешают определить путь к файлу конфигурации
-  и задать любые параметры в нём.
-
-В будущем также могут быть добавлены другие способы конфигурации:
-- Суперблок OSD, в котором будут храниться параметры OSD, связанные с дисковым
-  форматом и с этим конкретным OSD.
-- OSD-специфичные ключи в etcd типа `/vitastor/config/osd/<номер>`.
-
-## Список параметров
-
-- [Общие](config/common.ru.md)
-- [Сеть](config/network.ru.md)
-- [Глобальные дисковые параметры](config/layout-cluster.ru.md)
-- [Дисковые параметры OSD](config/layout-osd.ru.md)
-- [Прочие параметры OSD](config/osd.ru.md)
-- [Параметры мониторов](config/monitor.ru.md)

docs/config/common.en.md

@@ -1,46 +0,0 @@
-[Documentation](../../README.md#documentation) → [Configuration](../config.en.md) → Common Parameters
-
------
-
-[Читать на русском](common.ru.md)
-
-# Common Parameters
-
-These are the most common parameters which apply to all components of Vitastor.
-
-- [config_path](#config_path)
-- [etcd_address](#etcd_address)
-- [etcd_prefix](#etcd_prefix)
-- [log_level](#log_level)
-
-## config_path
-
-- Type: string
-- Default: /etc/vitastor/vitastor.conf
-
-Path to the JSON configuration file. Configuration file is optional,
-a non-existing configuration file does not prevent Vitastor from
-running if required parameters are specified.
-
-## etcd_address
-
-- Type: string or array of strings
-
-etcd connection endpoint(s). Multiple endpoints may be delimited by "," or
-specified in a JSON array `["10.0.115.10:2379/v3","10.0.115.11:2379/v3"]`.
-Note that https is not supported for etcd connections yet.
-
-## etcd_prefix
-
-- Type: string
-- Default: /vitastor
-
-Prefix for all keys in etcd used by Vitastor. You can change prefix and, for
-example, use a single etcd cluster for multiple Vitastor clusters.
-
-## log_level
-
-- Type: integer
-- Default: 0
-
-Log level. Raise if you want more verbose output.

docs/config/common.ru.md

@@ -1,45 +0,0 @@
-[Документация](../../README-ru.md#документация) → [Конфигурация](../config.ru.md) → Общие параметры
-
------
-
-[Read in English](common.en.md)
-
-# Общие параметры
-
-Это наиболее общие параметры, используемые всеми компонентами Vitastor.
-
-- [config_path](#config_path)
-- [etcd_address](#etcd_address)
-- [etcd_prefix](#etcd_prefix)
-- [log_level](#log_level)
-
-## config_path
-
-- Тип: строка
-- Значение по умолчанию: /etc/vitastor/vitastor.conf
-
-Путь к файлу конфигурации в формате JSON. Файл конфигурации необязателен,
-без него Vitastor тоже будет работать, если переданы необходимые параметры.
-
-## etcd_address
-
-- Тип: строка или массив строк
-
-Адрес(а) подключения к etcd. Несколько адресов могут разделяться запятой
-или указываться в виде JSON-массива `["10.0.115.10:2379/v3","10.0.115.11:2379/v3"]`.
-
-## etcd_prefix
-
-- Тип: строка
-- Значение по умолчанию: /vitastor
-
-Префикс для ключей etcd, которые использует Vitastor. Вы можете задать другой
-префикс, например, чтобы запустить несколько кластеров Vitastor с одним
-кластером etcd.
-
-## log_level
-
-- Тип: целое число
-- Значение по умолчанию: 0
-
-Уровень логгирования. Повысьте, если хотите более подробный вывод.

docs/config/inode.en.md

@@ -1,32 +0,0 @@
-[Documentation](../../README.md#documentation) → [Configuration](../config.en.md) → Image metadata in etcd
-
------
-
-[Читать на русском](inode.ru.md)
-
-# Image metadata in etcd
-
-Image list is stored in etcd in `/vitastor/config/inode/<pool>/<inode>` keys.
-
-You can even create images manually:
-
-```
-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.
-
-vitastor-cli, K8s, OpenStack and other drivers also store the reverse mapping in `/vitastor/index/image/<name>` keys
-in JSON format: `{"id":<inode>,"pool_id":<pool>}` and ID counters in `/vitastor/index/maxid/<pool>` as numbers
-to simplify ID generation.

docs/config/inode.ru.md

@@ -1,34 +0,0 @@
-[Документация](../../README-ru.md#документация) → [Конфигурация](../config.ru.md) → Метаданные образов в etcd
-
------
-
-[Read in English](inode.en.md)
-
-# Метаданные образов в etcd
-
-Список образов хранится в etcd в ключах `/vitastor/config/inode/<pool>/<inode>`.
-
-Вы можете даже создавать образы вручную:
-
-```
-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.
-
-vitastor-cli и драйвера K8s, OpenStack и т.п. также хранят обратный маппинг в ключах `/vitastor/index/image/<name>`
-в JSON-формате: `{"id":<inode>,"pool_id":<pool>}` и счётчики ID `/vitastor/index/maxid/<pool>` в виде просто чисел
-для упрощения генерации ID новых образов.

docs/config/layout-cluster.en.md

@@ -1,124 +0,0 @@
-[Documentation](../../README.md#documentation) → [Configuration](../config.en.md) → Cluster-Wide Disk Layout Parameters
-
------
-
-[Читать на русском](layout-cluster.ru.md)
-
-# Cluster-Wide Disk Layout Parameters
-
-These parameters apply to clients and OSDs, are fixed at the moment of OSD drive
-initialization and can't be changed after it without losing data.
-
-- [block_size](#block_size)
-- [bitmap_granularity](#bitmap_granularity)
-- [immediate_commit](#immediate_commit)
-- [client_dirty_limit](#client_dirty_limit)
-
-## block_size
-
-- Type: integer
-- Default: 131072
-
-Size of objects (data blocks) into which all physical and virtual drives are
-subdivided in Vitastor. One of current main settings in Vitastor, affects
-memory usage, write amplification and I/O load distribution effectiveness.
-
-Recommended default block size is 128 KB for SSD and 4 MB for HDD. In fact,
-it's possible to use 4 MB for SSD too - it will lower memory usage, but
-may increase average WA and reduce linear performance.
-
-OSDs with different block sizes (for example, SSD and SSD+HDD OSDs) can
-currently coexist in one etcd instance only within separate Vitastor
-clusters with different etcd_prefix'es.
-
-Also block size can't be changed after OSD initialization without losing
-data.
-
-You must always specify block_size in etcd in /vitastor/config/global if
-you change it so all clients can know about it.
-
-OSD memory usage is roughly (SIZE / BLOCK * 68 bytes) which is roughly
-544 MB per 1 TB of used disk space with the default 128 KB block size.
-
-## bitmap_granularity
-
-- Type: integer
-- Default: 4096
-
-Required virtual disk write alignment ("sector size"). Must be a multiple
-of disk_alignment. It's called bitmap granularity because Vitastor tracks
-an allocation bitmap for each object containing 2 bits per each
-(bitmap_granularity) bytes.
-
-This parameter can't be changed after OSD initialization without losing
-data. Also it's fixed for the whole Vitastor cluster i.e. two different
-values can't be used in a single Vitastor cluster.
-
-Clients MUST be aware of this parameter value, so put it into etcd key
-/vitastor/config/global if you change it for any reason.
-
-## immediate_commit
-
-- Type: string
-- Default: false
-
-Another parameter which is really important for performance.
-
-Desktop SSDs are very fast (100000+ iops) for simple random writes
-without cache flush. However, they are really slow (only around 1000 iops)
-if you try to fsync() each write, that is, when you want to guarantee that
-each change gets immediately persisted to the physical media.
-
-Server-grade SSDs with "Advanced/Enhanced Power Loss Protection" or with
-"Supercapacitor-based Power Loss Protection", on the other hand, are equally
-fast with and without fsync because their cache is protected from sudden
-power loss by a built-in supercapacitor-based "UPS".
-
-Some software-defined storage systems always fsync each write and thus are
-really slow when used with desktop SSDs. Vitastor, however, can also
-efficiently utilize desktop SSDs by postponing fsync until the client calls
-it explicitly.
-
-This is what this parameter regulates. When it's set to "all" the whole
-Vitastor cluster commits each change to disks immediately and clients just
-ignore fsyncs because they know for sure that they're unneeded. This reduces
-the amount of network roundtrips performed by clients and improves
-performance. So it's always better to use server grade SSDs with
-supercapacitors even with Vitastor, especially given that they cost only
-a bit more than desktop models.
-
-There is also a common SATA SSD (and HDD too!) firmware bug (or feature)
-that makes server SSDs which have supercapacitors slow with fsync. To check
-if your SSDs are affected, compare benchmark results from `fio -name=test
--ioengine=libaio -direct=1 -bs=4k -rw=randwrite -iodepth=1` with and without
-`-fsync=1`. Results should be the same. If fsync=1 result is worse you can
-try to work around this bug by "disabling" drive write-back cache by running
-`hdparm -W 0 /dev/sdXX` or `echo write through > /sys/block/sdXX/device/scsi_disk/*/cache_type`
-(IMPORTANT: don't mistake it with `/sys/block/sdXX/queue/write_cache` - it's
-unsafe to change by hand). The same may apply to newer HDDs with internal
-SSD cache or "media-cache" - for example, a lot of Seagate EXOS drives have
-it (they have internal SSD cache even though it's not stated in datasheets).
-
-This parameter must be set both in etcd in /vitastor/config/global and in
-OSD command line or configuration. Setting it to "all" or "small" requires
-enabling disable_journal_fsync and disable_meta_fsync, setting it to "all"
-also requires enabling disable_data_fsync.
-
-TLDR: For optimal performance, set immediate_commit to "all" if you only use
-SSDs with supercapacitor-based power loss protection (nonvolatile
-write-through cache) for both data and journals in the whole Vitastor
-cluster. Set it to "small" if you only use such SSDs for journals. Leave
-empty if your drives have write-back cache.
-
-## client_dirty_limit
-
-- Type: integer
-- Default: 33554432
-
-Without immediate_commit=all this parameter sets the limit of "dirty"
-(not committed by fsync) data allowed by the client before forcing an
-additional fsync and committing the data. Also note that the client always
-holds a copy of uncommitted data in memory so this setting also affects
-RAM usage of clients.
-
-This parameter doesn't affect OSDs themselves.

docs/config/layout-cluster.ru.md

@@ -1,134 +0,0 @@
-[Документация](../../README-ru.md#документация) → [Конфигурация](../config.ru.md) → Дисковые параметры уровня кластера
-
------
-
-[Read in English](layout-cluster.en.md)
-
-# Дисковые параметры уровня кластера
-
-Данные параметры используются клиентами и OSD, задаются в момент инициализации
-диска OSD и не могут быть изменены после этого без потери данных.
-
-- [block_size](#block_size)
-- [bitmap_granularity](#bitmap_granularity)
-- [immediate_commit](#immediate_commit)
-- [client_dirty_limit](#client_dirty_limit)
-
-## block_size
-
-- Тип: целое число
-- Значение по умолчанию: 131072
-
-Размер объектов (блоков данных), на которые делятся физические и виртуальные
-диски в Vitastor. Одна из ключевых на данный момент настроек, влияет на
-потребление памяти, объём избыточной записи (write amplification) и
-эффективность распределения нагрузки по OSD.
-
-Рекомендуемые по умолчанию размеры блока - 128 килобайт для SSD и 4
-мегабайта для HDD. В принципе, для SSD можно тоже использовать 4 мегабайта,
-это понизит использование памяти, но ухудшит распределение нагрузки и в
-среднем увеличит WA.
-
-OSD с разными размерами блока (например, SSD и SSD+HDD OSD) на данный
-момент могут сосуществовать в рамках одного etcd только в виде двух независимых
-кластеров Vitastor с разными etcd_prefix.
-
-Также размер блока нельзя менять после инициализации OSD без потери данных.
-
-Если вы меняете размер блока, обязательно прописывайте его в etcd в
-/vitastor/config/global, дабы все клиенты его знали.
-
-Потребление памяти OSD составляет примерно (РАЗМЕР / БЛОК * 68 байт),
-т.е. примерно 544 МБ памяти на 1 ТБ занятого места на диске при
-стандартном 128 КБ блоке.
-
-## bitmap_granularity
-
-- Тип: целое число
-- Значение по умолчанию: 4096
-
-Требуемое выравнивание записи на виртуальные диски (размер их "сектора").
-Должен быть кратен disk_alignment. Называется гранулярностью битовой карты
-потому, что Vitastor хранит битовую карту для каждого объекта, содержащую
-по 2 бита на каждые (bitmap_granularity) байт.
-
-Данный параметр нельзя менять после инициализации OSD без потери данных.
-Также он фиксирован для всего кластера Vitastor, т.е. разные значения
-не могут сосуществовать в одном кластере.
-
-Клиенты ДОЛЖНЫ знать правильное значение этого параметра, так что если вы
-его меняете, обязательно прописывайте изменённое значение в etcd в ключ
-/vitastor/config/global.
-
-## immediate_commit
-
-- Тип: строка
-- Значение по умолчанию: false
-
-Ещё один важный для производительности параметр.
-
-Модели SSD для настольных компьютеров очень быстрые (100000+ операций в
-секунду) при простой случайной записи без сбросов кэша. Однако они очень
-медленные (всего порядка 1000 iops), если вы пытаетесь сбрасывать кэш после
-каждой записи, то есть, если вы пытаетесь гарантировать, что каждое
-изменение физически записывается в энергонезависимую память.
-
-С другой стороны, серверные SSD с конденсаторами - функцией, называемой
-"Advanced/Enhanced Power Loss Protection" или просто "Supercapacitor-based
-Power Loss Protection" - одинаково быстрые и со сбросом кэша, и без
-него, потому что их кэш защищён от потери питания встроенным "источником
-бесперебойного питания" на основе суперконденсаторов и на самом деле они
-его никогда не сбрасывают.
-
-Некоторые программные СХД всегда сбрасывают кэши дисков при каждой записи
-и поэтому работают очень медленно с настольными SSD. Vitastor, однако, может
-откладывать fsync до явного его вызова со стороны клиента и таким образом
-эффективно утилизировать настольные SSD.
-
-Данный параметр влияет как раз на это. Когда он установлен в значение "all",
-весь кластер Vitastor мгновенно фиксирует каждое изменение на физические
-носители и клиенты могут просто игнорировать запросы fsync, т.к. они точно
-знают, что fsync-и не нужны. Это уменьшает число необходимых обращений к OSD
-по сети и улучшает производительность. Поэтому даже с Vitastor лучше всегда
-использовать только серверные модели SSD с суперконденсаторами, особенно
-учитывая то, что стоят они ненамного дороже настольных.
-
-Также в прошивках SATA SSD (и даже HDD!) очень часто встречается либо баг,
-либо просто особенность логики, из-за которой серверные SSD, имеющие
-конденсаторы и защиту от потери питания, всё равно медленно работают с
-fsync. Чтобы понять, подвержены ли этой проблеме ваши SSD, сравните
-результаты тестов `fio -name=test -ioengine=libaio -direct=1 -bs=4k
--rw=randwrite -iodepth=1` без и с опцией `-fsync=1`. Результаты должны
-быть одинаковые. Если результат с `fsync=1` хуже, вы можете попробовать
-обойти проблему, "отключив" кэш записи диска командой `hdparm -W 0 /dev/sdXX`
-либо `echo write through > /sys/block/sdXX/device/scsi_disk/*/cache_type`
-(ВАЖНО: не перепутайте с `/sys/block/sdXX/queue/write_cache` - этот параметр
-менять руками небезопасно). Такая же проблема может встречаться и в новых
-HDD-дисках с внутренним SSD или "медиа" кэшем - например, она встречается во
-многих дисках Seagate EXOS (у них есть внутренний SSD-кэш, хотя это и не
-указано в спецификациях).
-
-Данный параметр нужно указывать и в etcd в /vitastor/config/global, и в
-командной строке или конфигурации OSD. Значения "all" и "small" требуют
-включения disable_journal_fsync и disable_meta_fsync, значение "all" также
-требует включения disable_data_fsync.
-
-Итого, вкратце: для оптимальной производительности установите
-immediate_commit в значение "all", если вы используете в кластере только SSD
-с суперконденсаторами и для данных, и для журналов. Если вы используете
-такие SSD для всех журналов, но не для данных - можете установить параметр
-в "small". Если и какие-то из дисков журналов имеют волатильный кэш записи -
-оставьте параметр пустым.
-
-## client_dirty_limit
-
-- Тип: целое число
-- Значение по умолчанию: 33554432
-
-При работе без immediate_commit=all - это лимит объёма "грязных" (не
-зафиксированных fsync-ом) данных, при достижении которого клиент будет
-принудительно вызывать fsync и фиксировать данные. Также стоит иметь в виду,
-что в этом случае до момента fsync клиент хранит копию незафиксированных
-данных в памяти, то есть, настройка влияет на потребление памяти клиентами.
-
-Параметр не влияет на сами OSD.

docs/config/layout-osd.en.md

@@ -1,176 +0,0 @@
-[Documentation](../../README.md#documentation) → [Configuration](../config.en.md) → OSD Disk Layout Parameters
-
------
-
-[Читать на русском](layout-osd.ru.md)
-
-# OSD Disk Layout Parameters
-
-These parameters apply to OSDs, are fixed at the moment of OSD drive
-initialization and can't be changed after it without losing data.
-
-- [data_device](#data_device)
-- [meta_device](#meta_device)
-- [journal_device](#journal_device)
-- [journal_offset](#journal_offset)
-- [journal_size](#journal_size)
-- [meta_offset](#meta_offset)
-- [data_offset](#data_offset)
-- [data_size](#data_size)
-- [meta_block_size](#meta_block_size)
-- [journal_block_size](#journal_block_size)
-- [disable_data_fsync](#disable_data_fsync)
-- [disable_meta_fsync](#disable_meta_fsync)
-- [disable_journal_fsync](#disable_journal_fsync)
-- [disable_device_lock](#disable_device_lock)
-- [disk_alignment](#disk_alignment)
-
-## data_device
-
-- Type: string
-
-Path to the block device to use for data. It's highly recommendded to use
-stable paths for all device names: `/dev/disk/by-partuuid/xxx...` instead
-of just `/dev/sda` or `/dev/nvme0n1` to not mess up after server restart.
-Files can also be used instead of block devices, but this is implemented
-only for testing purposes and not for production.
-
-## meta_device
-
-- Type: string
-
-Path to the block device to use for the metadata. Metadata must be on a fast
-SSD or performance will suffer. If this option is skipped, `data_device` is
-used for the metadata.
-
-## journal_device
-
-- Type: string
-
-Path to the block device to use for the journal. Journal must be on a fast
-SSD or performance will suffer. If this option is skipped, `meta_device` is
-used for the journal, and if it's also empty, journal is put on
-`data_device`. It's almost always fine to put metadata and journal on the
-same device, in this case you only need to set `meta_device`.
-
-## journal_offset
-
-- Type: integer
-- Default: 0
-
-Offset on the device in bytes where the journal is stored.
-
-## journal_size
-
-- Type: integer
-
-Journal size in bytes. By default, all available space between journal_offset
-and data_offset, meta_offset or the end of the journal device is used.
-Large journals aren't needed in SSD-only setups, 32 MB is always enough.
-In SSD+HDD setups it is beneficial to use larger journals (for example, 1 GB)
-and enable [throttle_small_writes](osd.en.md#throttle_small_writes).
-
-## meta_offset
-
-- Type: integer
-- Default: 0
-
-Offset on the device in bytes where the metadata area is stored.
-Again, set it to something if you colocate metadata with journal or data.
-
-## data_offset
-
-- Type: integer
-- Default: 0
-
-Offset on the device in bytes where the data area is stored.
-Again, set it to something if you colocate data with journal or metadata.
-
-## data_size
-
-- Type: integer
-
-Data area size in bytes. By default, the whole data device up to the end
-will be used for the data area, but you can restrict it if you want to use
-a smaller part. Note that there is no option to set metadata area size -
-it's derived from the data area size.
-
-## meta_block_size
-
-- Type: integer
-- Default: 4096
-
-Physical block size of the metadata device. 4096 for most current
-HDDs and SSDs.
-
-## journal_block_size
-
-- Type: integer
-- Default: 4096
-
-Physical block size of the journal device. Must be a multiple of
-`disk_alignment`. 4096 for most current HDDs and SSDs.
-
-## disable_data_fsync
-
-- Type: boolean
-- Default: false
-
-Do not issue fsyncs to the data device, i.e. do not flush its cache.
-Safe ONLY if your data device has write-through cache. If you disable
-the cache yourself using `hdparm` or `scsi_disk/cache_type` then make sure
-that the cache disable command is run every time before starting Vitastor
-OSD, for example, in the systemd unit. See also `immediate_commit` option
-for the instructions to disable cache and how to benefit from it.
-
-## disable_meta_fsync
-
-- Type: boolean
-- Default: false
-
-Same as disable_data_fsync, but for the metadata device. If the metadata
-device is not set or if the data device is used for the metadata the option
-is ignored and disable_data_fsync value is used instead of it.
-
-## disable_journal_fsync
-
-- Type: boolean
-- Default: false
-
-Same as disable_data_fsync, but for the journal device. If the journal
-device is not set or if the metadata device is used for the journal the
-option is ignored and disable_meta_fsync value is used instead of it. If
-the same device is used for data, metadata and journal the option is also
-ignored and disable_data_fsync value is used instead of it.
-
-## disable_device_lock
-
-- Type: boolean
-- Default: false
-
-Do not lock data, metadata and journal block devices exclusively with
-flock(). Though it's not recommended, but you can use it you want to run
-multiple OSD with a single device and different offsets, without using
-partitions.
-
-## disk_alignment
-
-- Type: integer
-- Default: 4096
-
-Required physical disk write alignment. Most current SSD and HDD drives
-use 4 KB physical sectors even if they report 512 byte logical sector
-size, so 4 KB is a good default setting.
-
-Note, however, that physical sector size also affects WA, because with block
-devices it's impossible to write anything smaller than a block. So, when
-Vitastor has to write a single metadata entry that's only about 32 bytes in
-size, it actually has to write the whole 4 KB sector.
-
-Because of this it can actually be beneficial to use SSDs which work well
-with 512 byte sectors and use 512 byte disk_alignment, journal_block_size
-and meta_block_size. But the only SSD that may fit into this category is
-Intel Optane (probably, not tested yet).
-
-Clients don't need to be aware of disk_alignment, so it's not required to
-put a modified value into etcd key /vitastor/config/global.

docs/config/layout-osd.ru.md

@@ -1,185 +0,0 @@
-[Документация](../../README-ru.md#документация) → [Конфигурация](../config.ru.md) → Дисковые параметры OSD
-
------
-
-[Read in English](layout-osd.en.md)
-
-# Дисковые параметры OSD
-
-Данные параметры используются только OSD и, также как и общекластерные
-дисковые параметры, задаются в момент инициализации дисков OSD и не могут быть
-изменены после этого без потери данных.
-
-- [data_device](#data_device)
-- [meta_device](#meta_device)
-- [journal_device](#journal_device)
-- [journal_offset](#journal_offset)
-- [journal_size](#journal_size)
-- [meta_offset](#meta_offset)
-- [data_offset](#data_offset)
-- [data_size](#data_size)
-- [meta_block_size](#meta_block_size)
-- [journal_block_size](#journal_block_size)
-- [disable_data_fsync](#disable_data_fsync)
-- [disable_meta_fsync](#disable_meta_fsync)
-- [disable_journal_fsync](#disable_journal_fsync)
-- [disable_device_lock](#disable_device_lock)
-- [disk_alignment](#disk_alignment)
-
-## data_device
-
-- Тип: строка
-
-Путь к диску (блочному устройству) для хранения данных. Крайне рекомендуется
-использовать стабильные пути: `/dev/disk/by-partuuid/xxx...` вместо простых
-`/dev/sda` или `/dev/nvme0n1`, чтобы пути не могли спутаться после
-перезагрузки сервера. Также вместо блочных устройств можно указывать файлы,
-но это реализовано только для тестирования, а не для боевой среды.
-
-## meta_device
-
-- Тип: строка
-
-Путь к диску метаданных. Метаданные должны располагаться на быстром
-SSD-диске, иначе производительность пострадает. Если эта опция не указана,
-для метаданных используется `data_device`.
-
-## journal_device
-
-- Тип: строка
-
-Путь к диску журнала. Журнал должен располагаться на быстром SSD-диске,
-иначе производительность пострадает. Если эта опция не указана,
-для журнала используется `meta_device`, если же пуста и она, журнал
-располагается на `data_device`. Нормально располагать журнал и метаданные
-на одном устройстве, в этом случае достаточно указать только `meta_device`.
-
-## journal_offset
-
-- Тип: целое число
-- Значение по умолчанию: 0
-
-Смещение на устройстве в байтах, по которому располагается журнал.
-
-## journal_size
-
-- Тип: целое число
-
-Размер журнала в байтах. По умолчанию для журнала используется всё доступное
-место между journal_offset и data_offset, meta_offset или концом диска.
-В SSD-кластерах большие журналы не нужны, достаточно 32 МБ. В гибридных
-(SSD+HDD) кластерах осмысленно использовать больший размер журнал (например, 1 ГБ)
-и включить [throttle_small_writes](osd.ru.md#throttle_small_writes).
-
-## meta_offset
-
-- Тип: целое число
-- Значение по умолчанию: 0
-
-Смещение на устройстве в байтах, по которому располагаются метаданные.
-Эту опцию нужно задать, если метаданные у вас хранятся на том же
-устройстве, что данные или журнал.
-
-## data_offset
-
-- Тип: целое число
-- Значение по умолчанию: 0
-
-Смещение на устройстве в байтах, по которому располагаются данные.
-Эту опцию нужно задать, если данные у вас хранятся на том же
-устройстве, что метаданные или журнал.
-
-## data_size
-
-- Тип: целое число
-
-Размер области данных в байтах. По умолчанию под данные будет использована
-вся доступная область устройства данных до конца устройства, но вы можете
-использовать эту опцию, чтобы ограничить её меньшим размером. Заметьте, что
-опции размера области метаданных нет - она вычисляется из размера области
-данных автоматически.
-
-## meta_block_size
-
-- Тип: целое число
-- Значение по умолчанию: 4096
-
-Размер физического блока устройства метаданных. 4096 для большинства
-современных SSD и HDD.
-
-## journal_block_size
-
-- Тип: целое число
-- Значение по умолчанию: 4096
-
-Размер физического блока устройства журнала. Должен быть кратен
-`disk_alignment`. 4096 для большинства современных SSD и HDD.
-
-## disable_data_fsync
-
-- Тип: булево (да/нет)
-- Значение по умолчанию: false
-
-Не отправлять fsync-и устройству данных, т.е. не сбрасывать его кэш.
-Безопасно, ТОЛЬКО если ваше устройство данных имеет кэш со сквозной
-записью (write-through). Если вы отключаете кэш через `hdparm` или
-`scsi_disk/cache_type`, то удостоверьтесь, что команда отключения кэша
-выполняется перед каждым запуском Vitastor OSD, например, в systemd unit-е.
-Смотрите также опцию `immediate_commit` для инструкций по отключению кэша
-и о том, как из этого извлечь выгоду.
-
-## disable_meta_fsync
-
-- Тип: булево (да/нет)
-- Значение по умолчанию: false
-
-То же, что disable_data_fsync, но для устройства метаданных. Если устройство
-метаданных не задано или если оно равно устройству данных, значение опции
-игнорируется и вместо него используется значение опции disable_data_fsync.
-
-## disable_journal_fsync
-
-- Тип: булево (да/нет)
-- Значение по умолчанию: false
-
-То же, что disable_data_fsync, но для устройства журнала. Если устройство
-журнала не задано или если оно равно устройству метаданных, значение опции
-игнорируется и вместо него используется значение опции disable_meta_fsync.
-Если одно и то же устройство используется и под данные, и под журнал, и под
-метаданные - значение опции также игнорируется и вместо него используется
-значение опции disable_data_fsync.
-
-## disable_device_lock
-
-- Тип: булево (да/нет)
-- Значение по умолчанию: false
-
-Не блокировать устройства данных, метаданных и журнала от открытия их
-другими OSD с помощью flock(). Так делать не рекомендуется, но теоретически
-вы можете это использовать, чтобы запускать несколько OSD на одном
-устройстве с разными смещениями и без использования разделов.
-
-## disk_alignment
-
-- Тип: целое число
-- Значение по умолчанию: 4096
-
-Требуемое выравнивание записи на физические диски. Почти все современные
-SSD и HDD диски используют 4 КБ физические секторы, даже если показывают
-логический размер сектора 512 байт, поэтому 4 КБ - хорошее значение по
-умолчанию.
-
-Однако стоит понимать, что физический размер сектора тоже влияет на
-избыточную запись (WA), потому что ничего меньше блока (сектора) на блочное
-устройство записать невозможно. Таким образом, когда Vitastor-у нужно
-записать на диск всего лишь одну 32-байтную запись метаданных, фактически
-приходится перезаписывать 4 КБ сектор целиком.
-
-Поэтому, на самом деле, может быть выгодно найти SSD, хорошо работающие с
-меньшими, 512-байтными, блоками и использовать 512-байтные disk_alignment,
-journal_block_size и meta_block_size. Однако единственные SSD, которые
-теоретически могут попасть в эту категорию - это Intel Optane (но и это
-пока не проверялось автором).
-
-Клиентам не обязательно знать про disk_alignment, так что помещать значение
-этого параметра в etcd в /vitastor/config/global не нужно.

docs/config/monitor.en.md

@@ -1,79 +0,0 @@
-[Documentation](../../README.md#documentation) → [Configuration](../config.en.md) → Monitor Parameters
-
------
-
-[Читать на русском](monitor.ru.md)
-
-# Monitor Parameters
-
-These parameters only apply to Monitors.
-
-- [etcd_mon_ttl](#etcd_mon_ttl)
-- [etcd_mon_timeout](#etcd_mon_timeout)
-- [etcd_mon_retries](#etcd_mon_retries)
-- [mon_change_timeout](#mon_change_timeout)
-- [mon_stats_timeout](#mon_stats_timeout)
-- [osd_out_time](#osd_out_time)
-- [placement_levels](#placement_levels)
-
-## etcd_mon_ttl
-
-- Type: seconds
-- Default: 30
-- Minimum: 10
-
-Monitor etcd lease refresh interval in seconds
-
-## etcd_mon_timeout
-
-- Type: milliseconds
-- Default: 1000
-
-etcd request timeout used by monitor
-
-## etcd_mon_retries
-
-- Type: integer
-- Default: 5
-
-Maximum number of attempts for one monitor etcd request
-
-## mon_change_timeout
-
-- Type: milliseconds
-- Default: 1000
-- Minimum: 100
-
-Optimistic retry interval for monitor etcd modification requests
-
-## mon_stats_timeout
-
-- Type: milliseconds
-- Default: 1000
-- Minimum: 100
-
-Interval for monitor to wait before updating aggregated statistics in
-etcd after receiving OSD statistics updates
-
-## osd_out_time
-
-- Type: seconds
-- Default: 600
-
-Time after which a failed OSD is removed from the data distribution.
-I.e. time which the monitor waits before attempting to restore data
-redundancy using other OSDs.
-
-## placement_levels
-
-- Type: json
-- Default: `{"host":100,"osd":101}`
-
-Levels for the placement tree. You can define arbitrary tree levels by
-defining them in this parameter. The configuration parameter value should
-contain a JSON object with level names as keys and integer priorities as
-values.  Smaller priority means higher level in tree. For example,
-"datacenter" should have smaller priority than "osd". "host" and "osd"
-levels are always predefined and can't be removed. If one of them is not
-present in the configuration, then it is defined with the default priority
-(100 for "host", 101 for "osd").

docs/config/monitor.ru.md

@@ -1,80 +0,0 @@
-[Документация](../../README-ru.md#документация) → [Конфигурация](../config.ru.md) → Параметры мониторов
-
------
-
-[Read in English](monitor.en.md)
-
-# Параметры мониторов
-
-Данные параметры используются только мониторами Vitastor.
-
-- [etcd_mon_ttl](#etcd_mon_ttl)
-- [etcd_mon_timeout](#etcd_mon_timeout)
-- [etcd_mon_retries](#etcd_mon_retries)
-- [mon_change_timeout](#mon_change_timeout)
-- [mon_stats_timeout](#mon_stats_timeout)
-- [osd_out_time](#osd_out_time)
-- [placement_levels](#placement_levels)
-
-## etcd_mon_ttl
-
-- Тип: секунды
-- Значение по умолчанию: 30
-- Минимальное значение: 10
-
-Интервал обновления etcd резервации (lease) монитором
-
-## etcd_mon_timeout
-
-- Тип: миллисекунды
-- Значение по умолчанию: 1000
-
-Таймаут выполнения запросов к etcd от монитора
-
-## etcd_mon_retries
-
-- Тип: целое число
-- Значение по умолчанию: 5
-
-Максимальное число попыток выполнения запросов к etcd монитором
-
-## mon_change_timeout
-
-- Тип: миллисекунды
-- Значение по умолчанию: 1000
-- Минимальное значение: 100
-
-Время повтора при коллизиях при запросах модификации в etcd, производимых монитором
-
-## mon_stats_timeout
-
-- Тип: миллисекунды
-- Значение по умолчанию: 1000
-- Минимальное значение: 100
-
-Интервал, который монитор ожидает при изменении статистики по отдельным
-OSD перед обновлением агрегированной статистики в etcd
-
-## osd_out_time
-
-- Тип: секунды
-- Значение по умолчанию: 600
-
-Время, через которое отключенный OSD исключается из распределения данных.
-То есть, время, которое монитор ожидает перед попыткой переместить данные
-на другие OSD и таким образом восстановить избыточность хранения.
-
-## placement_levels
-
-- Тип: json
-- Значение по умолчанию: `{"host":100,"osd":101}`
-
-Определения уровней для дерева размещения OSD. Вы можете определять
-произвольные уровни, помещая их в данный параметр конфигурации. Значение
-параметра должно содержать JSON-объект, ключи которого будут являться
-названиями уровней, а значения - целочисленными приоритетами. Меньшие
-приоритеты соответствуют верхним уровням дерева. Например, уровень
-"датацентр" должен иметь меньший приоритет, чем "OSD". Уровни с названиями
-"host" и "osd" являются предопределёнными и не могут быть удалены. Если
-один из них отсутствует в конфигурации, он доопределяется с приоритетом по
-умолчанию (100 для уровня "host", 101 для "osd").

docs/config/network.en.md

@@ -1,214 +0,0 @@
-[Documentation](../../README.md#documentation) → [Configuration](../config.en.md) → Network Protocol Parameters
-
------
-
-[Читать на русском](network.ru.md)
-
-# Network Protocol Parameters
-
-These parameters apply to clients and OSDs and affect network connection logic
-between clients, OSDs and etcd.
-
-- [tcp_header_buffer_size](#tcp_header_buffer_size)
-- [use_sync_send_recv](#use_sync_send_recv)
-- [use_rdma](#use_rdma)
-- [rdma_device](#rdma_device)
-- [rdma_port_num](#rdma_port_num)
-- [rdma_gid_index](#rdma_gid_index)
-- [rdma_mtu](#rdma_mtu)
-- [rdma_max_sge](#rdma_max_sge)
-- [rdma_max_msg](#rdma_max_msg)
-- [rdma_max_recv](#rdma_max_recv)
-- [peer_connect_interval](#peer_connect_interval)
-- [peer_connect_timeout](#peer_connect_timeout)
-- [osd_idle_timeout](#osd_idle_timeout)
-- [osd_ping_timeout](#osd_ping_timeout)
-- [up_wait_retry_interval](#up_wait_retry_interval)
-- [max_etcd_attempts](#max_etcd_attempts)
-- [etcd_quick_timeout](#etcd_quick_timeout)
-- [etcd_slow_timeout](#etcd_slow_timeout)
-- [etcd_keepalive_timeout](#etcd_keepalive_timeout)
-- [etcd_ws_keepalive_timeout](#etcd_ws_keepalive_timeout)
-
-## tcp_header_buffer_size
-
-- Type: integer
-- Default: 65536
-
-Size of the buffer used to read data using an additional copy. Vitastor
-packet headers are 128 bytes, payload is always at least 4 KB, so it is
-usually beneficial to try to read multiple packets at once even though
-it requires to copy the data an additional time. The rest of each packet
-is received without an additional copy. You can try to play with this
-parameter and see how it affects random iops and linear bandwidth if you
-want.
-
-## use_sync_send_recv
-
-- Type: boolean
-- Default: false
-
-If true, synchronous send/recv syscalls are used instead of io_uring for
-socket communication. Useless for OSDs because they require io_uring anyway,
-but may be required for clients with old kernel versions.
-
-## use_rdma
-
-- Type: boolean
-- Default: true
-
-Try to use RDMA for communication if it's available. Disable if you don't
-want Vitastor to use RDMA. TCP-only clients can also talk to an RDMA-enabled
-cluster, so disabling RDMA may be needed if clients have RDMA devices,
-but they are not connected to the cluster.
-
-## rdma_device
-
-- Type: string
-
-RDMA device name to use for Vitastor OSD communications (for example,
-"rocep5s0f0"). Please note that Vitastor RDMA requires Implicit On-Demand
-Paging (Implicit ODP) and Scatter/Gather (SG) support from the RDMA device
-to work. For example, Mellanox ConnectX-3 and older adapters don't have
-Implicit ODP, so they're unsupported by Vitastor. Run `ibv_devinfo -v` as
-root to list available RDMA devices and their features.
-
-## rdma_port_num
-
-- Type: integer
-- Default: 1
-
-RDMA device port number to use. Only for devices that have more than 1 port.
-See `phys_port_cnt` in `ibv_devinfo -v` output to determine how many ports
-your device has.
-
-## rdma_gid_index
-
-- Type: integer
-- Default: 0
-
-Global address identifier index of the RDMA device to use. Different GID
-indexes may correspond to different protocols like RoCEv1, RoCEv2 and iWARP.
-Search for "GID" in `ibv_devinfo -v` output to determine which GID index
-you need.
-
-**IMPORTANT:** If you want to use RoCEv2 (as recommended) then the correct
-rdma_gid_index is usually 1 (IPv6) or 3 (IPv4).
-
-## rdma_mtu
-
-- Type: integer
-- Default: 4096
-
-RDMA Path MTU to use. Must be 1024, 2048 or 4096. There is usually no
-sense to change it from the default 4096.
-
-## rdma_max_sge
-
-- Type: integer
-- Default: 128
-
-Maximum number of scatter/gather entries to use for RDMA. OSDs negotiate
-the actual value when establishing connection anyway, so it's usually not
-required to change this parameter.
-
-## rdma_max_msg
-
-- Type: integer
-- Default: 1048576
-
-Maximum size of a single RDMA send or receive operation in bytes.
-
-## rdma_max_recv
-
-- Type: integer
-- Default: 8
-
-Maximum number of parallel RDMA receive operations. Note that this number
-of receive buffers `rdma_max_msg` in size are allocated for each client,
-so this setting actually affects memory usage. This is because RDMA receive
-operations are (sadly) still not zero-copy in Vitastor. It may be fixed in
-later versions.
-
-## peer_connect_interval
-
-- Type: seconds
-- Default: 5
-- Minimum: 1
-
-Interval before attempting to reconnect to an unavailable OSD.
-
-## peer_connect_timeout
-
-- Type: seconds
-- Default: 5
-- Minimum: 1
-
-Timeout for OSD connection attempts.
-
-## osd_idle_timeout
-
-- Type: seconds
-- Default: 5
-- Minimum: 1
-
-OSD connection inactivity time after which clients and other OSDs send
-keepalive requests to check state of the connection.
-
-## osd_ping_timeout
-
-- Type: seconds
-- Default: 5
-- Minimum: 1
-
-Maximum time to wait for OSD keepalive responses. If an OSD doesn't respond
-within this time, the connection to it is dropped and a reconnection attempt
-is scheduled.
-
-## up_wait_retry_interval
-
-- Type: milliseconds
-- Default: 500
-- Minimum: 50
-
-OSDs respond to clients with a special error code when they receive I/O
-requests for a PG that's not synchronized and started. This parameter sets
-the time for the clients to wait before re-attempting such I/O requests.
-
-## max_etcd_attempts
-
-- Type: integer
-- Default: 5
-
-Maximum number of attempts for etcd requests which can't be retried
-indefinitely.
-
-## etcd_quick_timeout
-
-- Type: milliseconds
-- Default: 1000
-
-Timeout for etcd requests which should complete quickly, like lease refresh.
-
-## etcd_slow_timeout
-
-- Type: milliseconds
-- Default: 5000
-
-Timeout for etcd requests which are allowed to wait for some time.
-
-## etcd_keepalive_timeout
-
-- Type: seconds
-- Default: max(30, etcd_report_interval*2)
-
-Timeout for etcd connection HTTP Keep-Alive. Should be higher than
-etcd_report_interval to guarantee that keepalive actually works.
-
-## etcd_ws_keepalive_timeout
-
-- Type: seconds
-- Default: 30
-
-etcd websocket ping interval required to keep the connection alive and
-detect disconnections quickly.

docs/config/network.ru.md

@@ -1,224 +0,0 @@
-[Документация](../../README-ru.md#документация) → [Конфигурация](../config.ru.md) → Параметры сетевого протокола
-
------
-
-[Read in English](network.en.md)
-
-# Параметры сетевого протокола
-
-Данные параметры используются клиентами и OSD и влияют на логику сетевого
-взаимодействия между клиентами, OSD, а также etcd.
-
-- [tcp_header_buffer_size](#tcp_header_buffer_size)
-- [use_sync_send_recv](#use_sync_send_recv)
-- [use_rdma](#use_rdma)
-- [rdma_device](#rdma_device)
-- [rdma_port_num](#rdma_port_num)
-- [rdma_gid_index](#rdma_gid_index)
-- [rdma_mtu](#rdma_mtu)
-- [rdma_max_sge](#rdma_max_sge)
-- [rdma_max_msg](#rdma_max_msg)
-- [rdma_max_recv](#rdma_max_recv)
-- [peer_connect_interval](#peer_connect_interval)
-- [peer_connect_timeout](#peer_connect_timeout)
-- [osd_idle_timeout](#osd_idle_timeout)
-- [osd_ping_timeout](#osd_ping_timeout)
-- [up_wait_retry_interval](#up_wait_retry_interval)
-- [max_etcd_attempts](#max_etcd_attempts)
-- [etcd_quick_timeout](#etcd_quick_timeout)
-- [etcd_slow_timeout](#etcd_slow_timeout)
-- [etcd_keepalive_timeout](#etcd_keepalive_timeout)
-- [etcd_ws_keepalive_timeout](#etcd_ws_keepalive_timeout)
-
-## tcp_header_buffer_size
-
-- Тип: целое число
-- Значение по умолчанию: 65536
-
-Размер буфера для чтения данных с дополнительным копированием. Пакеты
-Vitastor содержат 128-байтные заголовки, за которыми следуют данные размером
-от 4 КБ и для мелких операций ввода-вывода обычно выгодно за 1 вызов читать
-сразу несколько пакетов, даже не смотря на то, что это требует лишний раз
-скопировать данные. Часть каждого пакета за пределами значения данного
-параметра читается без дополнительного копирования. Вы можете попробовать
-поменять этот параметр и посмотреть, как он влияет на производительность
-случайного и линейного доступа.
-
-## use_sync_send_recv
-
-- Тип: булево (да/нет)
-- Значение по умолчанию: false
-
-Если установлено в истину, то вместо io_uring для передачи данных по сети
-будут использоваться обычные синхронные системные вызовы send/recv. Для OSD
-это бессмысленно, так как OSD в любом случае нуждается в io_uring, но, в
-принципе, это может применяться для клиентов со старыми версиями ядра.
-
-## use_rdma
-
-- Тип: булево (да/нет)
-- Значение по умолчанию: true
-
-Пытаться использовать RDMA для связи при наличии доступных устройств.
-Отключите, если вы не хотите, чтобы Vitastor использовал RDMA.
-TCP-клиенты также могут работать с RDMA-кластером, так что отключать
-RDMA может быть нужно только если у клиентов есть RDMA-устройства,
-но они не имеют соединения с кластером Vitastor.
-
-## rdma_device
-
-- Тип: строка
-
-Название RDMA-устройства для связи с Vitastor OSD (например, "rocep5s0f0").
-Имейте в виду, что поддержка RDMA в Vitastor требует функций устройства
-Implicit On-Demand Paging (Implicit ODP) и Scatter/Gather (SG). Например,
-адаптеры Mellanox ConnectX-3 и более старые не поддерживают Implicit ODP и
-потому не поддерживаются в Vitastor. Запустите `ibv_devinfo -v` от имени
-суперпользователя, чтобы посмотреть список доступных RDMA-устройств, их
-параметры и возможности.
-
-## rdma_port_num
-
-- Тип: целое число
-- Значение по умолчанию: 1
-
-Номер порта RDMA-устройства, который следует использовать. Имеет смысл
-только для устройств, у которых более 1 порта. Чтобы узнать, сколько портов
-у вашего адаптера, посмотрите `phys_port_cnt` в выводе команды
-`ibv_devinfo -v`.
-
-## rdma_gid_index
-
-- Тип: целое число
-- Значение по умолчанию: 0
-
-Номер глобального идентификатора адреса RDMA-устройства, который следует
-использовать. Разным gid_index могут соответствовать разные протоколы связи:
-RoCEv1, RoCEv2, iWARP. Чтобы понять, какой нужен вам - смотрите строчки со
-словом "GID" в выводе команды `ibv_devinfo -v`.
-
-**ВАЖНО:** Если вы хотите использовать RoCEv2 (как мы и рекомендуем), то
-правильный rdma_gid_index, как правило, 1 (IPv6) или 3 (IPv4).
-
-## rdma_mtu
-
-- Тип: целое число
-- Значение по умолчанию: 4096
-
-Максимальная единица передачи (Path MTU) для RDMA. Должно быть равно 1024,
-2048 или 4096. Обычно нет смысла менять значение по умолчанию, равное 4096.
-
-## rdma_max_sge
-
-- Тип: целое число
-- Значение по умолчанию: 128
-
-Максимальное число записей разделения/сборки (scatter/gather) для RDMA.
-OSD в любом случае согласовывают реальное значение при установке соединения,
-так что менять этот параметр обычно не нужно.
-
-## rdma_max_msg
-
-- Тип: целое число
-- Значение по умолчанию: 1048576
-
-Максимальный размер одной RDMA-операции отправки или приёма.
-
-## rdma_max_recv
-
-- Тип: целое число
-- Значение по умолчанию: 8
-
-Максимальное число параллельных RDMA-операций получения данных. Следует
-иметь в виду, что данное число буферов размером `rdma_max_msg` выделяется
-для каждого подключённого клиентского соединения, так что данная настройка
-влияет на потребление памяти. Это так потому, что RDMA-приём данных в
-Vitastor, увы, всё равно не является zero-copy, т.е. всё равно 1 раз
-копирует данные в памяти. Данная особенность, возможно, будет исправлена в
-более новых версиях Vitastor.
-
-## peer_connect_interval
-
-- Тип: секунды
-- Значение по умолчанию: 5
-- Минимальное значение: 1
-
-Время ожидания перед повторной попыткой соединиться с недоступным OSD.
-
-## peer_connect_timeout
-
-- Тип: секунды
-- Значение по умолчанию: 5
-- Минимальное значение: 1
-
-Максимальное время ожидания попытки соединения с OSD.
-
-## osd_idle_timeout
-
-- Тип: секунды
-- Значение по умолчанию: 5
-- Минимальное значение: 1
-
-Время неактивности соединения с OSD, после которого клиенты или другие OSD
-посылают запрос проверки состояния соединения.
-
-## osd_ping_timeout
-
-- Тип: секунды
-- Значение по умолчанию: 5
-- Минимальное значение: 1
-
-Максимальное время ожидания ответа на запрос проверки состояния соединения.
-Если OSD не отвечает за это время, соединение отключается и производится
-повторная попытка соединения.
-
-## up_wait_retry_interval
-
-- Тип: миллисекунды
-- Значение по умолчанию: 500
-- Минимальное значение: 50
-
-Когда OSD получают от клиентов запросы ввода-вывода, относящиеся к не
-поднятым на данный момент на них PG, либо к PG в процессе синхронизации,
-они отвечают клиентам специальным кодом ошибки, означающим, что клиент
-должен некоторое время подождать перед повторением запроса. Именно это время
-ожидания задаёт данный параметр.
-
-## max_etcd_attempts
-
-- Тип: целое число
-- Значение по умолчанию: 5
-
-Максимальное число попыток выполнения запросов к etcd для тех запросов,
-которые нельзя повторять бесконечно.
-
-## etcd_quick_timeout
-
-- Тип: миллисекунды
-- Значение по умолчанию: 1000
-
-Максимальное время выполнения запросов к etcd, которые должны завершаться
-быстро, таких, как обновление резервации (lease).
-
-## etcd_slow_timeout
-
-- Тип: миллисекунды
-- Значение по умолчанию: 5000
-
-Максимальное время выполнения запросов к etcd, для которых не обязательно
-гарантировать быстрое выполнение.
-
-## etcd_keepalive_timeout
-
-- Тип: секунды
-- Значение по умолчанию: max(30, etcd_report_interval*2)
-
-Таймаут для HTTP Keep-Alive в соединениях к etcd. Должен быть больше, чем
-etcd_report_interval, чтобы keepalive гарантированно работал.
-
-## etcd_ws_keepalive_timeout
-
-- Тип: секунды
-- Значение по умолчанию: 30
-
-Интервал проверки живости вебсокет-подключений к etcd.

docs/config/osd.en.md

@@ -1,297 +0,0 @@
-[Documentation](../../README.md#documentation) → [Configuration](../config.en.md) → Runtime OSD Parameters
-
------
-
-[Читать на русском](osd.ru.md)
-
-# Runtime OSD Parameters
-
-These parameters only apply to OSDs, are not fixed at the moment of OSD drive
-initialization and can be changed with an OSD restart.
-
-- [etcd_report_interval](#etcd_report_interval)
-- [run_primary](#run_primary)
-- [osd_network](#osd_network)
-- [bind_address](#bind_address)
-- [bind_port](#bind_port)
-- [autosync_interval](#autosync_interval)
-- [autosync_writes](#autosync_writes)
-- [recovery_queue_depth](#recovery_queue_depth)
-- [recovery_sync_batch](#recovery_sync_batch)
-- [readonly](#readonly)
-- [no_recovery](#no_recovery)
-- [no_rebalance](#no_rebalance)
-- [print_stats_interval](#print_stats_interval)
-- [slow_log_interval](#slow_log_interval)
-- [max_write_iodepth](#max_write_iodepth)
-- [min_flusher_count](#min_flusher_count)
-- [max_flusher_count](#max_flusher_count)
-- [inmemory_metadata](#inmemory_metadata)
-- [inmemory_journal](#inmemory_journal)
-- [journal_sector_buffer_count](#journal_sector_buffer_count)
-- [journal_no_same_sector_overwrites](#journal_no_same_sector_overwrites)
-- [throttle_small_writes](#throttle_small_writes)
-- [throttle_target_iops](#throttle_target_iops)
-- [throttle_target_mbs](#throttle_target_mbs)
-- [throttle_target_parallelism](#throttle_target_parallelism)
-- [throttle_threshold_us](#throttle_threshold_us)
-- [osd_memlock](#osd_memlock)
-
-## etcd_report_interval
-
-- Type: seconds
-- Default: 5
-
-Interval at which OSDs report their state to etcd. Affects OSD lease time
-and thus the failover speed. Lease time is equal to this parameter value
-plus max_etcd_attempts * etcd_quick_timeout because it should be guaranteed
-that every OSD always refreshes its lease in time.
-
-## run_primary
-
-- Type: boolean
-- Default: true
-
-Start primary OSD logic on this OSD. As of now, can be turned off only for
-debugging purposes. It's possible to implement additional feature for the
-monitor which may allow to separate primary and secondary OSDs, but it's
-unclear why anyone could need it, so it's not implemented.
-
-## osd_network
-
-- Type: string or array of strings
-
-Network mask of the network (IPv4 or IPv6) to use for OSDs. Note that
-although it's possible to specify multiple networks here, this does not
-mean that OSDs will create multiple listening sockets - they'll only
-pick the first matching address of an UP + RUNNING interface. Separate
-networks for cluster and client connections are also not implemented, but
-they are mostly useless anyway, so it's not a big deal.
-
-## bind_address
-
-- Type: string
-- Default: 0.0.0.0
-
-Instead of the network mask, you can also set OSD listen address explicitly
-using this parameter. May be useful if you want to start OSDs on interfaces
-that are not UP + RUNNING.
-
-## bind_port
-
-- Type: integer
-
-By default, OSDs pick random ports to use for incoming connections
-automatically. With this option you can set a specific port for a specific
-OSD by hand.
-
-## autosync_interval
-
-- Type: seconds
-- Default: 5
-
-Time interval at which automatic fsyncs/flushes are issued by each OSD when
-the immediate_commit mode if disabled. fsyncs are required because without
-them OSDs quickly fill their journals, become unable to clear them and
-stall. Also this option limits the amount of recent uncommitted changes
-which OSDs may lose in case of a power outage in case when clients don't
-issue fsyncs at all.
-
-## autosync_writes
-
-- Type: integer
-- Default: 128
-
-Same as autosync_interval, but sets the maximum number of uncommitted write
-operations before issuing an fsync operation internally.
-
-## recovery_queue_depth
-
-- Type: integer
-- Default: 4
-
-Maximum recovery operations per one primary OSD at any given moment of time.
-Currently it's the only parameter available to tune the speed or recovery
-and rebalancing, but it's planned to implement more.
-
-## recovery_sync_batch
-
-- Type: integer
-- Default: 16
-
-Maximum number of recovery operations before issuing an additional fsync.
-
-## readonly
-
-- Type: boolean
-- Default: false
-
-Read-only mode. If this is enabled, an OSD will never issue any writes to
-the underlying device. This may be useful for recovery purposes.
-
-## no_recovery
-
-- Type: boolean
-- Default: false
-
-Disable automatic background recovery of objects. Note that it doesn't
-affect implicit recovery of objects happening during writes - a write is
-always made to a full set of at least pg_minsize OSDs.
-
-## no_rebalance
-
-- Type: boolean
-- Default: false
-
-Disable background movement of data between different OSDs. Disabling it
-means that PGs in the `has_misplaced` state will be left in it indefinitely.
-
-## print_stats_interval
-
-- Type: seconds
-- Default: 3
-
-Time interval at which OSDs print simple human-readable operation
-statistics on stdout.
-
-## slow_log_interval
-
-- Type: seconds
-- Default: 10
-
-Time interval at which OSDs dump slow or stuck operations on stdout, if
-they're any. Also it's the time after which an operation is considered
-"slow".
-
-## max_write_iodepth
-
-- Type: integer
-- Default: 128
-
-Parallel client write operation limit per one OSD. Operations that exceed
-this limit are pushed to a temporary queue instead of being executed
-immediately.
-
-## min_flusher_count
-
-- Type: integer
-- Default: 1
-
-Flusher is a micro-thread that moves data from the journal to the data
-area of the device. Their number is auto-tuned between minimum and maximum.
-Minimum number is set by this parameter.
-
-## max_flusher_count
-
-- Type: integer
-- Default: 256
-
-Maximum number of journal flushers (see above min_flusher_count).
-
-## inmemory_metadata
-
-- Type: boolean
-- Default: true
-
-This parameter makes Vitastor always keep metadata area of the block device
-in memory. It's required for good performance because it allows to avoid
-additional read-modify-write cycles during metadata modifications. Metadata
-area size is currently roughly 224 MB per 1 TB of data. You can turn it off
-to reduce memory usage by this value, but it will hurt performance. This
-restriction is likely to be removed in the future along with the upgrade
-of the metadata storage scheme.
-
-## inmemory_journal
-
-- Type: boolean
-- Default: true
-
-This parameter make Vitastor always keep journal area of the block
-device in memory. Turning it off will, again, reduce memory usage, but
-hurt performance because flusher coroutines will have to read data from
-the disk back before copying it into the main area. The memory usage benefit
-is typically very small because it's sufficient to have 16-32 MB journal
-for SSD OSDs. However, in theory it's possible that you'll want to turn it
-off for hybrid (HDD+SSD) OSDs with large journals on quick devices.
-
-## journal_sector_buffer_count
-
-- Type: integer
-- Default: 32
-
-Maximum number of buffers that can be used for writing journal metadata
-blocks. The only situation when you should increase it to a larger value
-is when you enable journal_no_same_sector_overwrites. In this case set
-it to, for example, 1024.
-
-## journal_no_same_sector_overwrites
-
-- Type: boolean
-- Default: false
-
-Enable this option for SSDs like Intel D3-S4510 and D3-S4610 which REALLY
-don't like when a program overwrites the same sector multiple times in a
-row and slow down significantly (from 25000+ iops to ~3000 iops). When
-this option is set, Vitastor will always move to the next sector of the
-journal after writing it instead of possibly overwriting it the second time.
-
-Most (99%) other SSDs don't need this option.
-
-## throttle_small_writes
-
-- Type: boolean
-- Default: false
-
-Enable soft throttling of small journaled writes. Useful for hybrid OSDs
-with fast journal/metadata devices and slow data devices. The idea is that
-small writes complete very quickly because they're first written to the
-journal device, but moving them to the main device is slow. So if an OSD
-allows clients to issue a lot of small writes it will perform very good
-for several seconds and then the journal will fill up and the performance
-will drop to almost zero. Throttling is meant to prevent this problem by
-artifically slowing quick writes down based on the amount of free space in
-the journal. When throttling is used, the performance of small writes will
-decrease smoothly instead of abrupt drop at the moment when the journal
-fills up.
-
-## throttle_target_iops
-
-- Type: integer
-- Default: 100
-
-Target maximum number of throttled operations per second under the condition
-of full journal. Set it to approximate random write iops of your data devices
-(HDDs).
-
-## throttle_target_mbs
-
-- Type: integer
-- Default: 100
-
-Target maximum bandwidth in MB/s of throttled operations per second under
-the condition of full journal. Set it to approximate linear write
-performance of your data devices (HDDs).
-
-## throttle_target_parallelism
-
-- Type: integer
-- Default: 1
-
-Target maximum parallelism of throttled operations under the condition of
-full journal. Set it to approximate internal parallelism of your data
-devices (1 for HDDs, 4-8 for SSDs).
-
-## throttle_threshold_us
-
-- Type: microseconds
-- Default: 50
-
-Minimal computed delay to be applied to throttled operations. Usually
-doesn't need to be changed.
-
-## osd_memlock
-
-- Type: boolean
-- Default: false
-
-Lock all OSD memory to prevent it from being unloaded into swap with mlockall(). Requires sufficient ulimit -l (max locked memory).

docs/config/osd.ru.md

@@ -1,310 +0,0 @@
-[Документация](../../README-ru.md#документация) → [Конфигурация](../config.ru.md) → Изменяемые параметры OSD
-
------
-
-[Read in English](osd.en.md)
-
-# Изменяемые параметры OSD
-
-Данные параметры используются только OSD, но, в отличие от дисковых параметров,
-не фиксируются в момент инициализации дисков OSD и могут быть изменены в любой
-момент с перезапуском OSD.
-
-- [etcd_report_interval](#etcd_report_interval)
-- [run_primary](#run_primary)
-- [osd_network](#osd_network)
-- [bind_address](#bind_address)
-- [bind_port](#bind_port)
-- [autosync_interval](#autosync_interval)
-- [autosync_writes](#autosync_writes)
-- [recovery_queue_depth](#recovery_queue_depth)
-- [recovery_sync_batch](#recovery_sync_batch)
-- [readonly](#readonly)
-- [no_recovery](#no_recovery)
-- [no_rebalance](#no_rebalance)
-- [print_stats_interval](#print_stats_interval)
-- [slow_log_interval](#slow_log_interval)
-- [max_write_iodepth](#max_write_iodepth)
-- [min_flusher_count](#min_flusher_count)
-- [max_flusher_count](#max_flusher_count)
-- [inmemory_metadata](#inmemory_metadata)
-- [inmemory_journal](#inmemory_journal)
-- [journal_sector_buffer_count](#journal_sector_buffer_count)
-- [journal_no_same_sector_overwrites](#journal_no_same_sector_overwrites)
-- [throttle_small_writes](#throttle_small_writes)
-- [throttle_target_iops](#throttle_target_iops)
-- [throttle_target_mbs](#throttle_target_mbs)
-- [throttle_target_parallelism](#throttle_target_parallelism)
-- [throttle_threshold_us](#throttle_threshold_us)
-- [osd_memlock](#osd_memlock)
-
-## etcd_report_interval
-
-- Тип: секунды
-- Значение по умолчанию: 5
-
-Интервал, с которым OSD обновляет своё состояние в etcd. Значение параметра
-влияет на время резервации (lease) OSD и поэтому на скорость переключения
-при падении OSD. Время lease равняется значению этого параметра плюс
-max_etcd_attempts * etcd_quick_timeout.
-
-## run_primary
-
-- Тип: булево (да/нет)
-- Значение по умолчанию: true
-
-Запускать логику первичного OSD на данном OSD. На данный момент отключать
-эту опцию может иметь смысл только в целях отладки. В теории, можно
-реализовать дополнительный режим для монитора, который позволит отделять
-первичные OSD от вторичных, но пока не понятно, зачем это может кому-то
-понадобиться, поэтому это не реализовано.
-
-## osd_network
-
-- Тип: строка или массив строк
-
-Маска подсети (IPv4 или IPv6) для использования для соединений с OSD.
-Имейте в виду, что хотя сейчас и можно передать в этот параметр несколько
-подсетей, это не означает, что OSD будут создавать несколько слушающих
-сокетов - они лишь будут выбирать адрес первого поднятого (состояние UP +
-RUNNING), подходящий под заданную маску. Также не реализовано разделение
-кластерной и публичной сетей OSD. Правда, от него обычно всё равно довольно
-мало толку, так что особенной проблемы в этом нет.
-
-## bind_address
-
-- Тип: строка
-- Значение по умолчанию: 0.0.0.0
-
-Этим параметром можно явным образом задать адрес, на котором будет ожидать
-соединений OSD (вместо использования маски подсети). Может быть полезно,
-например, чтобы запускать OSD на неподнятых интерфейсах (не UP + RUNNING).
-
-## bind_port
-
-- Тип: целое число
-
-По умолчанию OSD сами выбирают случайные порты для входящих подключений.
-С помощью данной опции вы можете задать порт для отдельного OSD вручную.
-
-## autosync_interval
-
-- Тип: секунды
-- Значение по умолчанию: 5
-
-Временной интервал отправки автоматических fsync-ов (операций очистки кэша)
-каждым OSD для случая, когда режим immediate_commit отключён. fsync-и нужны
-OSD, чтобы успевать очищать журнал - без них OSD быстро заполняют журналы и
-перестают обрабатывать операции записи. Также эта опция ограничивает объём
-недавних незафиксированных изменений, которые OSD могут терять при
-отключении питания, если клиенты вообще не отправляют fsync.
-
-## autosync_writes
-
-- Тип: целое число
-- Значение по умолчанию: 128
-
-Аналогично autosync_interval, но задаёт не временной интервал, а
-максимальное количество незафиксированных операций записи перед
-принудительной отправкой fsync-а.
-
-## recovery_queue_depth
-
-- Тип: целое число
-- Значение по умолчанию: 4
-
-Максимальное число операций восстановления на одном первичном OSD в любой
-момент времени. На данный момент единственный параметр, который можно менять
-для ускорения или замедления восстановления и перебалансировки данных, но
-в планах реализация других параметров.
-
-## recovery_sync_batch
-
-- Тип: целое число
-- Значение по умолчанию: 16
-
-Максимальное число операций восстановления перед дополнительным fsync.
-
-## readonly
-
-- Тип: булево (да/нет)
-- Значение по умолчанию: false
-
-Режим "только чтение". Если включить этот режим, OSD не будет писать ничего
-на диск. Может быть полезно в целях восстановления.
-
-## no_recovery
-
-- Тип: булево (да/нет)
-- Значение по умолчанию: false
-
-Отключить автоматическое фоновое восстановление объектов. Обратите внимание,
-что эта опция не отключает восстановление объектов, происходящее при
-записи - запись всегда производится в полный набор из как минимум pg_minsize
-OSD.
-
-## no_rebalance
-
-- Тип: булево (да/нет)
-- Значение по умолчанию: false
-
-Отключить фоновое перемещение объектов между разными OSD. Отключение
-означает, что PG, находящиеся в состоянии `has_misplaced`, будут оставлены
-в нём на неопределённый срок.
-
-## print_stats_interval
-
-- Тип: секунды
-- Значение по умолчанию: 3
-
-Временной интервал, с которым OSD печатают простую человекочитаемую
-статистику выполнения операций в стандартный вывод.
-
-## slow_log_interval
-
-- Тип: секунды
-- Значение по умолчанию: 10
-
-Временной интервал, с которым OSD выводят в стандартный вывод список
-медленных или зависших операций, если таковые имеются. Также время, при
-превышении которого операция считается "медленной".
-
-## max_write_iodepth
-
-- Тип: целое число
-- Значение по умолчанию: 128
-
-Максимальное число одновременных клиентских операций записи на один OSD.
-Операции, превышающие этот лимит, не исполняются сразу, а сохраняются во
-временной очереди.
-
-## min_flusher_count
-
-- Тип: целое число
-- Значение по умолчанию: 1
-
-Flusher - это микро-поток (корутина), которая копирует данные из журнала в
-основную область устройства данных. Их число настраивается динамически между
-минимальным и максимальным значением. Этот параметр задаёт минимальное число.
-
-## max_flusher_count
-
-- Тип: целое число
-- Значение по умолчанию: 256
-
-Максимальное число микро-потоков очистки журнала (см. выше min_flusher_count).
-
-## inmemory_metadata
-
-- Тип: булево (да/нет)
-- Значение по умолчанию: true
-
-Данный параметр заставляет Vitastor всегда держать область метаданных диска
-в памяти. Это нужно, чтобы избегать дополнительных операций чтения с диска
-при записи. Размер области метаданных на данный момент составляет примерно
-224 МБ на 1 ТБ данных. При включении потребление памяти снизится примерно
-на эту величину, но при этом также снизится и производительность. В будущем,
-после обновления схемы хранения метаданных, это ограничение, скорее всего,
-будет ликвидировано.
-
-## inmemory_journal
-
-- Тип: булево (да/нет)
-- Значение по умолчанию: true
-
-Данный параметр заставляет Vitastor всегда держать в памяти журналы OSD.
-Отключение параметра, опять же, снижает потребление памяти, но ухудшает
-производительность, так как для копирования данных из журнала в основную
-область устройства OSD будут вынуждены читать их обратно с диска. Выигрыш
-по памяти при этом обычно крайне низкий, так как для SSD OSD обычно
-достаточно 16- или 32-мегабайтного журнала. Однако в теории отключение
-параметра может оказаться полезным для гибридных OSD (HDD+SSD) с большими
-журналами, расположенными на быстром по сравнению с HDD устройстве.
-
-## journal_sector_buffer_count
-
-- Тип: целое число
-- Значение по умолчанию: 32
-
-Максимальное число буферов, разрешённых для использования под записываемые
-в журнал блоки метаданных. Единственная ситуация, в которой этот параметр
-нужно менять - это если вы включаете journal_no_same_sector_overwrites. В
-этом случае установите данный параметр, например, в 1024.
-
-## journal_no_same_sector_overwrites
-
-- Тип: булево (да/нет)
-- Значение по умолчанию: false
-
-Включайте данную опцию для SSD вроде Intel D3-S4510 и D3-S4610, которые
-ОЧЕНЬ не любят, когда ПО перезаписывает один и тот же сектор несколько раз
-подряд. Такие SSD при многократной перезаписи одного и того же сектора
-сильно замедляются - условно, с 25000 и более iops до 3000 iops. Когда
-данная опция установлена, Vitastor всегда переходит к следующему сектору
-журнала после записи вместо потенциально повторной перезаписи того же
-самого сектора.
-
-Почти все другие SSD (99% моделей) не требуют данной опции.
-
-## throttle_small_writes
-
-- Тип: булево (да/нет)
-- Значение по умолчанию: false
-
-Разрешить мягкое ограничение скорости журналируемой записи. Полезно для
-гибридных OSD с быстрыми устройствами метаданных и медленными устройствами
-данных. Идея заключается в том, что мелкие записи в этой ситуации могут
-завершаться очень быстро, так как они изначально записываются на быстрое
-журнальное устройство (SSD). Но перемещать их потом на основное медленное
-устройство долго. Поэтому если OSD быстро примет от клиентов очень много
-мелких операций записи, он быстро заполнит свой журнал, после чего
-производительность записи резко упадёт практически до нуля. Ограничение
-скорости записи призвано решить эту проблему с помощью искусственного
-замедления операций записи на основании объёма свободного места в журнале.
-Когда эта опция включена, производительность мелких операций записи будет
-снижаться плавно, а не резко в момент окончательного заполнения журнала.
-
-## throttle_target_iops
-
-- Тип: целое число
-- Значение по умолчанию: 100
-
-Расчётное максимальное число ограничиваемых операций в секунду при условии
-отсутствия свободного места в журнале. Устанавливайте приблизительно равным
-максимальной производительности случайной записи ваших устройств данных
-(HDD) в операциях в секунду.
-
-## throttle_target_mbs
-
-- Тип: целое число
-- Значение по умолчанию: 100
-
-Расчётный максимальный размер в МБ/с ограничиваемых операций в секунду при
-условии отсутствия свободного места в журнале. Устанавливайте приблизительно
-равным максимальной производительности линейной записи ваших устройств
-данных (HDD).
-
-## throttle_target_parallelism
-
-- Тип: целое число
-- Значение по умолчанию: 1
-
-Расчётный максимальный параллелизм ограничиваемых операций в секунду при
-условии отсутствия свободного места в журнале. Устанавливайте приблизительно
-равным внутреннему параллелизму ваших устройств данных (1 для HDD, 4-8
-для SSD).
-
-## throttle_threshold_us
-
-- Тип: микросекунды
-- Значение по умолчанию: 50
-
-Минимальная применимая к ограничиваемым операциям задержка. Обычно не
-требует изменений.
-
-## osd_memlock
-
-- Тип: булево (да/нет)
-- Значение по умолчанию: false
-
-Блокировать всю память OSD с помощью mlockall, чтобы запретить её выгрузку в пространство подкачки. Требует достаточного значения ulimit -l (лимита заблокированной памяти).