Use murmur3 in the old PG combinator too ?

After half a year of hard work, VitastorFS is finally here ! :-)

New features:
- VitastorFS, a full-featured clustered (read-write-many) file system.
  Documentation: [VitastorFS](docs/usage/nfs.en.md)
- Embedded key-value database implementation based on Parallel Optimistic B-Tree
  algorithm and used for the metadata of VitastorFS
- Pool management commands in vitastor-cli (create-pool, list-pools, rm-pool, modify-pool).
  Thanks MIND Software (https://mindsw.io) for their contribution!
  [Documentation](docs/usage/cli.en.md#create-pool)

Bug fixes:
- Fix a very rare "infinite loop" in the client library
- Fix a rare OSD hang on during start when zeroing out bad metadata entries left from the previous run

.gitea/workflows/buildenv.Dockerfile

@@ -22,7 +22,7 @@ RUN apt-get update
 RUN apt-get -y install etcd qemu-system-x86 qemu-block-extra qemu-utils fio libasan5 \
     liburing1 liburing-dev libgoogle-perftools-dev devscripts libjerasure-dev cmake libibverbs-dev libisal-dev
 RUN apt-get -y build-dep fio qemu=`dpkg -s qemu-system-x86|grep ^Version:|awk '{print $2}'`
-RUN apt-get -y install jq lp-solve sudo
+RUN apt-get -y install jq lp-solve sudo nfs-common
 RUN apt-get --download-only source fio qemu=`dpkg -s qemu-system-x86|grep ^Version:|awk '{print $2}'`
 
 RUN set -ex; \

.gitea/workflows/test.yml

@@ -856,3 +856,21 @@ jobs:
           echo ""
         done
 
+  test_nfs:
+    runs-on: ubuntu-latest
+    needs: build
+    container: ${{env.TEST_IMAGE}}:${{github.sha}}
+    steps:
+    - name: Run test
+      id: test
+      timeout-minutes: 3
+      run: /root/vitastor/tests/test_nfs.sh
+    - name: Print logs
+      if: always() && steps.test.outcome == 'failure'
+      run: |
+        for i in /root/vitastor/testdata/*.log /root/vitastor/testdata/*.txt; do
+          echo "-------- $i --------"
+          cat $i
+          echo ""
+        done
+

CMakeLists.txt

@@ -2,6 +2,6 @@ cmake_minimum_required(VERSION 2.8.12)
 
 project(vitastor)
 
-set(VERSION "1.4.7")
+set(VERSION "1.5.0")
 
 add_subdirectory(src)

README-ru.md

@@ -6,8 +6,8 @@
 
 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
+Vitastor - распределённая блочная и файловая SDS (программная СХД), прямой аналог Ceph RBD и CephFS,
+а также 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,
@@ -63,11 +63,13 @@ Vitastor поддерживает QEMU-драйвер, протоколы NBD и
   - [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
+  - [NFS](docs/usage/nfs.ru.md) кластерная файловая система и псевдо-ФС прокси
+  - [Администрирование](docs/usage/admin.ru.md)
 - 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)
+  - [Более новый тест Vitastor 1.3.1](docs/performance/bench2.ru.md)
 
 ## Автор и лицензия
 

README.md

@@ -6,9 +6,9 @@
 
 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 a distributed block and file SDS, direct replacement of Ceph RBD and CephFS,
+and also 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
@@ -63,11 +63,13 @@ Read more details below in the documentation.
   - [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
+  - [NFS](docs/usage/nfs.en.md) clustered file system and pseudo-FS proxy
+  - [Administration](docs/usage/admin.en.md)
 - 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)
+  - [Newer benchmark of Vitastor 1.3.1](docs/performance/bench2.en.md)
 
 ## Author and License
 

csi/Makefile

@@ -1,4 +1,4 @@
-VERSION ?= v1.4.7
+VERSION ?= v1.5.0
 
 all: build push
 

csi/deploy/004-csi-nodeplugin.yaml

@@ -49,7 +49,7 @@ spec:
             capabilities:
               add: ["SYS_ADMIN"]
             allowPrivilegeEscalation: true
-          image: vitalif/vitastor-csi:v1.4.7
+          image: vitalif/vitastor-csi:v1.5.0
           args:
             - "--node=$(NODE_ID)"
             - "--endpoint=$(CSI_ENDPOINT)"

csi/deploy/007-csi-provisioner.yaml

@@ -121,7 +121,7 @@ spec:
             privileged: true
             capabilities:
               add: ["SYS_ADMIN"]
-          image: vitalif/vitastor-csi:v1.4.7
+          image: vitalif/vitastor-csi:v1.5.0
           args:
             - "--node=$(NODE_ID)"
             - "--endpoint=$(CSI_ENDPOINT)"

csi/src/config.go

@@ -5,7 +5,7 @@ package vitastor
 
 const (
     vitastorCSIDriverName    = "csi.vitastor.io"
-    vitastorCSIDriverVersion = "1.4.7"
+    vitastorCSIDriverVersion = "1.5.0"
 )
 
 // Config struct fills the parameters of request or user input

debian/build-vitastor-bookworm.sh

@@ -3,5 +3,5 @@
 cat < vitastor.Dockerfile > ../Dockerfile
 cd ..
 mkdir -p packages
-sudo podman build --build-arg REL=bookworm -v `pwd`/packages:/root/packages -f Dockerfile .
+sudo podman build --build-arg DISTRO=debian --build-arg REL=bookworm -v `pwd`/packages:/root/packages -f Dockerfile .
 rm Dockerfile

debian/build-vitastor-bullseye.sh

@@ -3,5 +3,5 @@
 cat < vitastor.Dockerfile > ../Dockerfile
 cd ..
 mkdir -p packages
-sudo podman build --build-arg REL=bullseye -v `pwd`/packages:/root/packages -f Dockerfile .
+sudo podman build --build-arg DISTRO=debian --build-arg REL=bullseye -v `pwd`/packages:/root/packages -f Dockerfile .
 rm Dockerfile

debian/build-vitastor-buster.sh

@@ -3,5 +3,5 @@
 cat < vitastor.Dockerfile > ../Dockerfile
 cd ..
 mkdir -p packages
-sudo podman build --build-arg REL=buster -v `pwd`/packages:/root/packages -f Dockerfile .
+sudo podman build --build-arg DISTRO=debian --build-arg REL=buster -v `pwd`/packages:/root/packages -f Dockerfile .
 rm Dockerfile

debian/build-vitastor-ubuntu-jammy.sh

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

debian/changelog

@@ -1,4 +1,4 @@
-vitastor (1.4.7-1) unstable; urgency=medium
+vitastor (1.5.0-1) unstable; urgency=medium
 
   * Bugfixes
 

debian/libvirt.Dockerfile

@@ -1,13 +1,14 @@
 # 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 .
+# cd ..; podman build --build-arg DISTRO=debian --build-arg REL=bullseye -v `pwd`/packages:/root/packages -f debian/libvirt.Dockerfile .
 
+ARG DISTRO=
 ARG REL=
-FROM debian:$REL
+FROM $DISTRO:$REL
 ARG REL=
 
 WORKDIR /root
 
-RUN if [ "$REL" = "buster" -o "$REL" = "bullseye" ]; then \
+RUN if ([ "${DISTRO}" = "debian" ]) && ( [ "${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; \
@@ -23,7 +24,7 @@ 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
+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 patches/libvirt-8.0-vitastor.diff /root
 RUN set -e; \
     mkdir -p /root/packages/libvirt-$REL; \
     rm -rf /root/packages/libvirt-$REL/*; \

debian/vitastor-client.install

@@ -3,4 +3,6 @@ usr/bin/vitastor-cli
 usr/bin/vitastor-rm
 usr/bin/vitastor-nbd
 usr/bin/vitastor-nfs
+usr/bin/vitastor-kv
+usr/bin/vitastor-kv-stress
 usr/lib/*/libvitastor*.so*

debian/vitastor.Dockerfile

@@ -1,8 +1,10 @@
 # Build Vitastor packages for Debian inside a container
-# cd ..; podman build --build-arg REL=bullseye -v `pwd`/packages:/root/packages -f debian/vitastor.Dockerfile .
+# cd ..; podman build --build-arg DISTRO=debian --build-arg REL=bullseye -v `pwd`/packages:/root/packages -f debian/vitastor.Dockerfile .
 
+ARG DISTRO=debian
 ARG REL=
-FROM debian:$REL
+FROM $DISTRO:$REL
+ARG DISTRO=debian
 ARG REL=
 
 WORKDIR /root
@@ -35,8 +37,8 @@ RUN set -e -x; \
     mkdir -p /root/packages/vitastor-$REL; \
     rm -rf /root/packages/vitastor-$REL/*; \
     cd /root/packages/vitastor-$REL; \
-    cp -r /root/vitastor vitastor-1.4.7; \
-    cd vitastor-1.4.7; \
+    cp -r /root/vitastor vitastor-1.5.0; \
+    cd vitastor-1.5.0; \
     ln -s /root/fio-build/fio-*/ ./fio; \
     FIO=$(head -n1 fio/debian/changelog | perl -pe 's/^.*\((.*?)\).*$/$1/'); \
     ls /usr/include/linux/raw.h || cp ./debian/raw.h /usr/include/linux/raw.h; \
@@ -49,8 +51,8 @@ RUN set -e -x; \
     rm -rf a b; \
     echo "dep:fio=$FIO" > debian/fio_version; \
     cd /root/packages/vitastor-$REL; \
-    tar --sort=name --mtime='2020-01-01' --owner=0 --group=0 --exclude=debian -cJf vitastor_1.4.7.orig.tar.xz vitastor-1.4.7; \
-    cd vitastor-1.4.7; \
+    tar --sort=name --mtime='2020-01-01' --owner=0 --group=0 --exclude=debian -cJf vitastor_1.5.0.orig.tar.xz vitastor-1.5.0; \
+    cd vitastor-1.5.0; \
     V=$(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; \

docs/config/client.en.md

@@ -9,6 +9,8 @@
 These parameters apply only to Vitastor clients (QEMU, fio, NBD and so on) and
 affect their interaction with the cluster.
 
+- [client_retry_interval](#client_retry_interval)
+- [client_eio_retry_interval](#client_eio_retry_interval)
 - [client_max_dirty_bytes](#client_max_dirty_bytes)
 - [client_max_dirty_ops](#client_max_dirty_ops)
 - [client_enable_writeback](#client_enable_writeback)
@@ -19,6 +21,26 @@ affect their interaction with the cluster.
 - [nbd_max_devices](#nbd_max_devices)
 - [nbd_max_part](#nbd_max_part)
 
+## client_retry_interval
+
+- Type: milliseconds
+- Default: 50
+- Minimum: 10
+- Can be changed online: yes
+
+Retry time for I/O requests failed due to inactive PGs or network
+connectivity errors.
+
+## client_eio_retry_interval
+
+- Type: milliseconds
+- Default: 1000
+- Can be changed online: yes
+
+Retry time for I/O requests failed due to data corruption or unfinished
+EC object deletions (has_incomplete PG state). 0 disables such retries
+and clients are not blocked and just get EIO error code instead.
+
 ## client_max_dirty_bytes
 
 - Type: integer

docs/config/client.ru.md

@@ -9,6 +9,8 @@
 Данные параметры применяются только к клиентам Vitastor (QEMU, fio, NBD и т.п.) и
 затрагивают логику их работы с кластером.
 
+- [client_retry_interval](#client_retry_interval)
+- [client_eio_retry_interval](#client_eio_retry_interval)
 - [client_max_dirty_bytes](#client_max_dirty_bytes)
 - [client_max_dirty_ops](#client_max_dirty_ops)
 - [client_enable_writeback](#client_enable_writeback)
@@ -19,6 +21,27 @@
 - [nbd_max_devices](#nbd_max_devices)
 - [nbd_max_part](#nbd_max_part)
 
+## client_retry_interval
+
+- Тип: миллисекунды
+- Значение по умолчанию: 50
+- Минимальное значение: 10
+- Можно менять на лету: да
+
+Время повтора запросов ввода-вывода, неудачных из-за неактивных PG или
+ошибок сети.
+
+## client_eio_retry_interval
+
+- Тип: миллисекунды
+- Значение по умолчанию: 1000
+- Можно менять на лету: да
+
+Время повтора запросов ввода-вывода, неудачных из-за повреждения данных
+или незавершённых удалений EC-объектов (состояния PG has_incomplete).
+0 отключает повторы таких запросов и клиенты не блокируются, а вместо
+этого просто получают код ошибки EIO.
+
 ## client_max_dirty_bytes
 
 - Тип: целое число

docs/config/network.en.md

@@ -25,12 +25,11 @@ between clients, OSDs and etcd.
 - [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)
+- [etcd_ws_keepalive_interval](#etcd_ws_keepalive_interval)
 
 ## tcp_header_buffer_size
 
@@ -212,17 +211,6 @@ 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: 50
-- Minimum: 10
-- Can be changed online: yes
-
-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
@@ -257,7 +245,7 @@ Timeout for etcd requests which are allowed to wait for some time.
 Timeout for etcd connection HTTP Keep-Alive. Should be higher than
 etcd_report_interval to guarantee that keepalive actually works.
 
-## etcd_ws_keepalive_timeout
+## etcd_ws_keepalive_interval
 
 - Type: seconds
 - Default: 30

docs/config/network.ru.md

@@ -25,12 +25,11 @@
 - [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)
+- [etcd_ws_keepalive_interval](#etcd_ws_keepalive_interval)
 
 ## tcp_header_buffer_size
 
@@ -221,19 +220,6 @@ OSD в любом случае согласовывают реальное зн
 Если OSD не отвечает за это время, соединение отключается и производится
 повторная попытка соединения.
 
-## up_wait_retry_interval
-
-- Тип: миллисекунды
-- Значение по умолчанию: 50
-- Минимальное значение: 10
-- Можно менять на лету: да
-
-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
@@ -270,7 +256,7 @@ OSD в любом случае согласовывают реальное зн
 Таймаут для HTTP Keep-Alive в соединениях к etcd. Должен быть больше, чем
 etcd_report_interval, чтобы keepalive гарантированно работал.
 
-## etcd_ws_keepalive_timeout
+## etcd_ws_keepalive_interval
 
 - Тип: секунды
 - Значение по умолчанию: 30

docs/config/pool.en.md

@@ -41,6 +41,7 @@ Parameters:
 - [osd_tags](#osd_tags)
 - [primary_affinity_tags](#primary_affinity_tags)
 - [scrub_interval](#scrub_interval)
+- [used_for_fs](#used_for_fs)
 
 Examples:
 
@@ -154,8 +155,25 @@ That is, if it becomes impossible to place PG data on at least (pg_minsize)
 OSDs, PG is deactivated for both read and write. So you know that a fresh
 write always goes to at least (pg_minsize) OSDs (disks).
 
-That is, pg_size minus pg_minsize sets the number of disk failures to tolerate
-without temporary downtime (for [osd_out_time](monitor.en.md#osd_out_time)).
+For example, the difference between pg_minsize 2 and 1 in a 3-way replicated
+pool (pg_size=3) is:
+- If 2 hosts go down with pg_minsize=2, the pool becomes inactive and remains
+  inactive for [osd_out_time](monitor.en.md#osd_out_time) (10 minutes). After
+  this timeout, the monitor selects replacement hosts/OSDs and the pool comes
+  up and starts to heal. Therefore, if you don't have replacement OSDs, i.e.
+  if you only have 3 hosts with OSDs and 2 of them are down, the pool remains
+  inactive until you add or return at least 1 host (or change failure_domain
+  to "osd").
+- If 2 hosts go down with pg_minsize=1, the pool only experiences a short
+  I/O pause until the monitor notices that OSDs are down (5-10 seconds with
+  the default [etcd_report_interval](osd.en.md#etcd_report_interval)). After
+  this pause, I/O resumes, but new data is temporarily written in only 1 copy.
+  Then, after osd_out_time, the monitor also selects replacement OSDs and the
+  pool starts to heal.
+
+So, pg_minsize regulates the number of failures that a pool can tolerate
+without temporary downtime for [osd_out_time](monitor.en.md#osd_out_time),
+but at a cost of slightly reduced storage reliability.
 
 FIXME: pg_minsize behaviour may be changed in the future to only make PGs
 read-only instead of deactivating them.
@@ -168,8 +186,8 @@ read-only instead of deactivating them.
 Number of PGs for this pool. The value should be big enough for the monitor /
 LP solver to be able to optimize data placement.
 
-"Enough" is usually around 64-128 PGs per OSD, i.e. you set pg_count for pool
-to (total OSD count * 100 / pg_size). You can round it to the closest power of 2,
+"Enough" is usually around 10-100 PGs per OSD, i.e. you set pg_count for pool
+to (total OSD count * 10 / pg_size). You can round it to the closest power of 2,
 because it makes it easier to reduce or increase PG count later by dividing or
 multiplying it by 2.
 
@@ -282,6 +300,25 @@ of the OSDs containing a data chunk for a PG.
 Automatic scrubbing interval for this pool. Overrides
 [global scrub_interval setting](osd.en.md#scrub_interval).
 
+## used_for_fs
+
+- Type: string
+
+If non-empty, the pool is marked as used for VitastorFS with metadata stored
+in block image (regular Vitastor volume) named as the value of this pool parameter.
+
+When a pool is marked as used for VitastorFS, regular block volume creation in it
+is disabled (vitastor-cli refuses to create images without --force) to protect
+the user from block volume and FS file ID collisions and data loss.
+
+[vitastor-nfs](../usage/nfs.ru.md), in its turn, refuses to use pools not marked
+for the corresponding FS when starting. This also implies that you can use one
+pool only for one VitastorFS.
+
+The second thing that is disabled for VitastorFS pools is reporting per-inode space
+usage statistics in etcd because a FS pool may store a very large number of files
+and statistics for them all would take a lot of space in etcd.
+
 # Examples
 
 ## Replicated pool

docs/config/pool.ru.md

@@ -40,6 +40,7 @@
 - [osd_tags](#osd_tags)
 - [primary_affinity_tags](#primary_affinity_tags)
 - [scrub_interval](#scrub_interval)
+- [used_for_fs](#used_for_fs)
 
 Примеры:
 
@@ -157,9 +158,25 @@
 OSD, PG деактивируется на чтение и запись. Иными словами, всегда известно,
 что новые блоки данных всегда записываются как минимум на pg_minsize дисков.
 
-По сути, разница pg_size и pg_minsize задаёт число отказов дисков, которые пул
-может пережить без временной (на [osd_out_time](monitor.ru.md#osd_out_time))
-остановки обслуживания.
+Для примера, разница между pg_minsize 2 и 1 в реплицированном пуле с 3 копиями
+данных (pg_size=3), проявляется следующим образом:
+- Если 2 сервера отключаются при pg_minsize=2, пул становится неактивным и
+  остаётся неактивным в течение [osd_out_time](monitor.en.md#osd_out_time)
+  (10 минут), после чего монитор назначает другие OSD/серверы на замену, пул
+  поднимается и начинает восстанавливать недостающие копии данных. Соответственно,
+  если OSD на замену нет - то есть, если у вас всего 3 сервера с OSD и 2 из них
+  недоступны - пул так и остаётся недоступным до тех пор, пока вы не вернёте
+  или не добавите хотя бы 1 сервер (или не переключите failure_domain на "osd").
+- Если 2 сервера отключаются при pg_minsize=1, ввод-вывод лишь приостанавливается
+  на короткое время, до тех пор, пока монитор не поймёт, что OSD отключены
+  (что занимает 5-10 секунд при стандартном [etcd_report_interval](osd.en.md#etcd_report_interval)).
+  После этого ввод-вывод восстанавливается, но новые данные временно пишутся
+  всего в 1 копии. Когда же проходит osd_out_time, монитор точно так же назначает
+  другие OSD на замену выбывшим и пул начинает восстанавливать копии данных.
+
+То есть, pg_minsize регулирует число отказов, которые пул может пережить без
+временной остановки обслуживания на [osd_out_time](monitor.ru.md#osd_out_time),
+но ценой немного пониженных гарантий надёжности.
 
 FIXME: Поведение pg_minsize может быть изменено в будущем с полной деактивации
 PG на перевод их в режим только для чтения.
@@ -172,8 +189,8 @@ PG на перевод их в режим только для чтения.
 Число PG для данного пула. Число должно быть достаточно большим, чтобы монитор
 мог равномерно распределить по ним данные.
 
-Обычно это означает примерно 64-128 PG на 1 OSD, т.е. pg_count можно устанавливать
-равным (общему числу OSD * 100 / pg_size). Значение можно округлить до ближайшей
+Обычно это означает примерно 10-100 PG на 1 OSD, т.е. pg_count можно устанавливать
+равным (общему числу OSD * 10 / pg_size). Значение можно округлить до ближайшей
 степени 2, чтобы потом было легче уменьшать или увеличивать число PG, умножая
 или деля его на 2.
 
@@ -290,6 +307,27 @@ OSD с "all".
 Интервал скраба, то есть, автоматической фоновой проверки данных для данного пула.
 Переопределяет [глобальную настройку scrub_interval](osd.ru.md#scrub_interval).
 
+## used_for_fs
+
+- Type: string
+
+Если непусто, пул помечается как используемый для файловой системы VitastorFS с
+метаданными, хранимыми в блочном образе Vitastor с именем, равным значению
+этого параметра.
+
+Когда пул помечается как используемый для VitastorFS, создание обычных блочных
+образов в нём отключается (vitastor-cli отказывается создавать образы без --force),
+чтобы защитить пользователя от коллизий ID файлов и блочных образов и, таким
+образом, от потери данных.
+
+[vitastor-nfs](../usage/nfs.ru.md), в свою очередь, при запуске отказывается
+использовать для ФС пулы, не выделенные для неё. Это также означает, что один
+пул может использоваться только для одной VitastorFS.
+
+Также для ФС-пулов отключается передача статистики в etcd по отдельным инодам,
+так как ФС-пул может содержать очень много файлов и статистика по ним всем
+заняла бы очень много места в etcd.
+
 # Примеры
 
 ## Реплицированный пул

docs/config/src/client.yml

@@ -1,3 +1,27 @@
+- name: client_retry_interval
+  type: ms
+  min: 10
+  default: 50
+  online: true
+  info: |
+    Retry time for I/O requests failed due to inactive PGs or network
+    connectivity errors.
+  info_ru: |
+    Время повтора запросов ввода-вывода, неудачных из-за неактивных PG или
+    ошибок сети.
+- name: client_eio_retry_interval
+  type: ms
+  default: 1000
+  online: true
+  info: |
+    Retry time for I/O requests failed due to data corruption or unfinished
+    EC object deletions (has_incomplete PG state). 0 disables such retries
+    and clients are not blocked and just get EIO error code instead.
+  info_ru: |
+    Время повтора запросов ввода-вывода, неудачных из-за повреждения данных
+    или незавершённых удалений EC-объектов (состояния PG has_incomplete).
+    0 отключает повторы таких запросов и клиенты не блокируются, а вместо
+    этого просто получают код ошибки EIO.
 - name: client_max_dirty_bytes
   type: int
   default: 33554432

docs/config/src/included.en.md

@@ -56,6 +56,8 @@
 
 {{../../usage/nfs.en.md}}
 
+{{../../usage/admin.en.md}}
+
 ## Performance
 
 {{../../performance/understanding.en.md}}
@@ -64,4 +66,6 @@
 
 {{../../performance/comparison1.en.md}}
 
+{{../../performance/bench2.en.md}}
+
 {{../../intro/author.en.md|indent=1}}

docs/config/src/included.ru.md

@@ -56,6 +56,8 @@
 
 {{../../usage/nfs.ru.md}}
 
+{{../../usage/admin.ru.md}}
+
 ## Производительность
 
 {{../../performance/understanding.ru.md}}
@@ -64,4 +66,6 @@
 
 {{../../performance/comparison1.ru.md}}
 
+{{../../performance/bench2.ru.md}}
+
 {{../../intro/author.ru.md|indent=1}}

docs/config/src/network.yml

@@ -243,21 +243,6 @@
     Максимальное время ожидания ответа на запрос проверки состояния соединения.
     Если OSD не отвечает за это время, соединение отключается и производится
     повторная попытка соединения.
-- name: up_wait_retry_interval
-  type: ms
-  min: 10
-  default: 50
-  online: true
-  info: |
-    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.
-  info_ru: |
-    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.
 - name: max_etcd_attempts
   type: int
   default: 5
@@ -295,7 +280,7 @@
   info_ru: |
     Таймаут для HTTP Keep-Alive в соединениях к etcd. Должен быть больше, чем
     etcd_report_interval, чтобы keepalive гарантированно работал.
-- name: etcd_ws_keepalive_timeout
+- name: etcd_ws_keepalive_interval
   type: sec
   default: 30
   online: true

docs/intro/features.en.md

@@ -13,7 +13,7 @@
 ## Server-side features
 
 - Basic part: highly-available block storage with symmetric clustering and no SPOF
-- [Performance](../performance/comparison1.en.md) ;-D
+- [Performance](../performance/bench2.en.md) ;-D
 - [Multiple redundancy schemes](../config/pool.en.md#scheme): Replication, XOR n+1, Reed-Solomon erasure codes
   based on jerasure and ISA-L libraries with any number of data and parity drives in a group
 - Configuration via simple JSON data structures in etcd (parameters, pools and images)
@@ -33,6 +33,7 @@
 - [Checksums](../config/layout-osd.en.md#data_csum_type)
 - [Client write-back cache](../config/client.en.md#client_enable_writeback)
 - [Intelligent recovery auto-tuning](../config/osd.en.md#recovery_tune_interval)
+- [Clustered file system](../usage/nfs.en.md#vitastorfs)
 
 ## Plugins and tools
 
@@ -46,13 +47,12 @@
 - [CSI plugin for Kubernetes](../installation/kubernetes.en.md)
 - [OpenStack support: Cinder driver, Nova and libvirt patches](../installation/openstack.en.md)
 - [Proxmox storage plugin and packages](../installation/proxmox.en.md)
-- [Simplified NFS proxy for file-based image access emulation (suitable for VMWare)](../usage/nfs.en.md)
+- [Simplified NFS proxy for file-based image access emulation (suitable for VMWare)](../usage/nfs.en.md#pseudo-fs)
 
 ## Roadmap
 
 The following features are planned for the future:
 
-- File system
 - Control plane optimisation
 - Other administrative tools
 - Web GUI

docs/intro/features.ru.md

@@ -13,7 +13,7 @@
 ## Серверные функции
 
 - Базовая часть - надёжное кластерное блочное хранилище без единой точки отказа
-- [Производительность](../performance/comparison1.ru.md) ;-D
+- [Производительность](../performance/bench2.ru.md) ;-D
 - [Несколько схем отказоустойчивости](../config/pool.ru.md#scheme): репликация, XOR n+1 (1 диск чётности), коды коррекции ошибок
   Рида-Соломона на основе библиотек jerasure и ISA-L с любым числом дисков данных и чётности в группе
 - Конфигурация через простые человекочитаемые JSON-структуры в etcd
@@ -35,6 +35,7 @@
 - [Контрольные суммы](../config/layout-osd.ru.md#data_csum_type)
 - [Буферизация записи на стороне клиента](../config/client.ru.md#client_enable_writeback)
 - [Интеллектуальная автоподстройка скорости восстановления](../config/osd.ru.md#recovery_tune_interval)
+- [Кластерная файловая система](../usage/nfs.ru.md#vitastorfs)
 
 ## Драйверы и инструменты
 
@@ -48,11 +49,10 @@
 - [CSI-плагин для Kubernetes](../installation/kubernetes.ru.md)
 - [Базовая поддержка OpenStack: драйвер Cinder, патчи для Nova и libvirt](../installation/openstack.ru.md)
 - [Плагин для Proxmox](../installation/proxmox.ru.md)
-- [Упрощённая NFS-прокси для эмуляции файлового доступа к образам (подходит для VMWare)](../usage/nfs.ru.md)
+- [Упрощённая NFS-прокси для эмуляции файлового доступа к образам (подходит для VMWare)](../usage/nfs.ru.md#псевдо-фс)
 
 ## Планы развития
 
-- Файловая система
 - Оптимизация слоя управления
 - Другие инструменты администрирования
 - Web-интерфейс

docs/intro/quickstart.en.md

@@ -14,6 +14,7 @@
 - [Check cluster status](#check-cluster-status)
 - [Create an image](#create-an-image)
 - [Install plugins](#install-plugins)
+- [Create VitastorFS](#create-vitastorfs)
 
 ## Preparation
 
@@ -75,18 +76,16 @@ On the monitor hosts:
 
 ## Create a pool
 
-Create pool configuration in etcd:
+Create a pool using vitastor-cli:
 
 ```
-etcdctl --endpoints=... put /vitastor/config/pools '{"1":{"name":"testpool",
-  "scheme":"replicated","pg_size":2,"pg_minsize":1,"pg_count":256,"failure_domain":"host"}}'
+vitastor-cli create-pool testpool --pg_size 2 --pg_count 256
 ```
 
 For EC pools the configuration should look like the following:
 
 ```
-etcdctl --endpoints=... put /vitastor/config/pools '{"2":{"name":"ecpool",
-  "scheme":"ec","pg_size":4,"parity_chunks":2,"pg_minsize":2,"pg_count":256,"failure_domain":"host"}}'
+vitastor-cli create-pool testpool --ec 2+2 --pg_count 256
 ```
 
 After you do this, one of the monitors will configure PGs and OSDs will start them.
@@ -116,3 +115,9 @@ After that, you can [run benchmarks](../usage/fio.en.md) or [start QEMU manually
 - [Proxmox](../installation/proxmox.en.md)
 - [OpenStack](../installation/openstack.en.md)
 - [Kubernetes CSI](../installation/kubernetes.en.md)
+
+## Create VitastorFS
+
+If you want to use clustered file system in addition to VM or container images:
+
+- [Follow the instructions here](../usage/nfs.en.md#vitastorfs)

docs/intro/quickstart.ru.md

@@ -14,6 +14,7 @@
 - [Проверьте состояние кластера](#проверьте-состояние-кластера)
 - [Создайте образ](#создайте-образ)
 - [Установите плагины](#установите-плагины)
+- [Создайте VitastorFS](#создайте-vitastorfs)
 
 ## Подготовка
 
@@ -77,18 +78,16 @@
 
 ## Создайте пул
 
-Создайте конфигурацию пула с помощью etcdctl:
+Создайте пул с помощью vitastor-cli:
 
 ```
-etcdctl --endpoints=... put /vitastor/config/pools '{"1":{"name":"testpool",
-  "scheme":"replicated","pg_size":2,"pg_minsize":1,"pg_count":256,"failure_domain":"host"}}'
+vitastor-cli create-pool testpool --pg_size 2 --pg_count 256
 ```
 
 Для пулов с кодами коррекции ошибок конфигурация должна выглядеть примерно так:
 
 ```
-etcdctl --endpoints=... put /vitastor/config/pools '{"2":{"name":"ecpool",
-  "scheme":"ec","pg_size":4,"parity_chunks":2,"pg_minsize":2,"pg_count":256,"failure_domain":"host"}}'
+vitastor-cli create-pool testpool --ec 2+2 --pg_count 256
 ```
 
 После этого один из мониторов должен сконфигурировать PG, а OSD должны запустить их.
@@ -118,3 +117,10 @@ vitastor-cli create -s 10G testimg
 - [Proxmox](../installation/proxmox.ru.md)
 - [OpenStack](../installation/openstack.ru.md)
 - [Kubernetes CSI](../installation/kubernetes.ru.md)
+
+## Создайте VitastorFS
+
+Если вы хотите использовать не только блочные образы виртуальных машин или контейнеров,
+а также кластерную файловую систему, то:
+
+- [Следуйте инструкциям](../usage/nfs.en.md#vitastorfs)

docs/performance/bench2.en.md

@@ -0,0 +1,154 @@
+[Documentation](../../README.md#documentation) → Performance → Newer benchmark of Vitastor 1.3.1
+
+-----
+
+[Читать на русском](bench2.ru.md)
+
+# Newer benchmark of Vitastor 1.3.1
+
+- [Test environment](#test-environment)
+- [Notes](#notes)
+- [Raw drive performance](#raw-drive-performance)
+- [2 replicas](#2-replicas)
+- [3 replicas](#3-replicas)
+- [EC 2+1](#ec-2-1)
+
+## Test environment
+
+Hardware configuration: 3 nodes, each with:
+- 8x NVMe Samsung PM9A3 1.92 TB
+- 2x Xeon Gold 6342 (24 cores @ 2.8 GHz)
+- 256 GB RAM
+- Dual-port 25 GbE Mellanox ConnectX-4 LX network card with RoCEv2
+- Connected to 2 Mellanox SN2010 switches with MLAG
+
+## Notes
+
+Vitastor version was 1.3.1.
+
+Tests were ran from the storage nodes - 4 fio clients per each of 3 nodes.
+
+The same large 3 TB image was tested from all hosts because Vitastor has no
+performance penalties related to running multiple clients over a single inode.
+
+CPU power saving was disabled. 4 OSDs were created per each NVMe.
+Checksums were not enabled. Tests with checksums will be conducted later,
+along with the newer version of Vitastor, and results will be updated.
+
+CPU configuration was not optimal because of NUMA. It's better to avoid 2-socket
+platforms. It was especially noticeable in RDMA tests - in the form of ksoftirqd
+processes (usually 1 per server) eating 100 % of one CPU core and actual bandwidth
+of one network port reduced to 3-5 Gbit/s instead of 25 Gbit/s - probably because
+of RFS (Receive Flow Steering) misses. Many network configurations were tried during
+tests, but nothing helped to solve this problem, so final tests were conducted with
+the default settings.
+
+# Raw drive performance
+
+- Linear write ~1000-2000 MB/s, depending on current state of the drive's garbage collector
+- Linear read ~3300 MB/s
+- T1Q1 random write ~60000 iops (latency ~0.015ms)
+- T1Q1 random read ~14700 iops (latency ~0.066ms)
+- T1Q16 random write ~180000 iops
+- T1Q16 random read ~120000 iops
+- T1Q32 random write ~180000 iops
+- T1Q32 random read ~195000 iops
+- T1Q128 random write ~180000 iops
+- T1Q128 random read ~195000 iops
+- T4Q128 random write ~525000 iops
+- T4Q128 random read ~750000 iops
+
+These numbers make obvious that results could be much better if a faster network
+was available, because NVMe drives obviously weren't a bottleneck. For example,
+theoretical maximum linear read performance for 24 drives could be 79.2 GByte/s,
+which is 633 Gbit/s. Real Vitastor read speed (both linear and random) was around
+16 Gbyte/s, which is 130 Gbit/s. It's important to note that it was still much
+larger than the network bandwidth of one server (50 Gbit/s). This is also correct
+because tests were conducted from all 3 nodes.
+
+## 2 replicas
+
+|                              | TCP          | RDMA         |
+|------------------------------|--------------|--------------|
+| Linear read (4M T6 Q16)      | 13.13 GB/s   | 16.25 GB/s   |
+| Linear write (4M T6 Q16)     | 8.16 GB/s    | 7.88 GB/s    |
+| Read 4k T1 Q1                | 8745 iops    | 10252 iops   |
+| Write 4k T1 Q1               | 8097 iops    | 11488 iops   |
+| Read 4k T12 Q128             | 1305936 iops | 4265861 iops |
+| Write 4k T12 Q128            | 660490 iops  | 1384033 iops |
+
+CPU consumption OSD per 1 disk:
+
+|                              | TCP     | RDMA    |
+|------------------------------|---------|---------|
+| Linear read (4M T6 Q16)      | 29.7 %  | 29.8 %  |
+| Linear write (4M T6 Q16)     | 84.4 %  | 33.2 %  |
+| Read 4k T12 Q128             | 98.4 %  | 119.1 % |
+| Write 4k T12 Q128            | 173.4 % | 175.9 % |
+
+CPU consumption per 1 client (fio):
+
+|                              | TCP    | RDMA   |
+|------------------------------|--------|--------|
+| Linear read (4M T6 Q16)      | 100 %  | 85.2 % |
+| Linear write (4M T6 Q16)     | 55.8 % | 48.8 % |
+| Read 4k T12 Q128             | 99.9 % | 96 %   |
+| Write 4k T12 Q128            | 71.6 % | 48.5 % |
+
+## 3 replicas
+
+|                              | TCP          | RDMA         |
+|------------------------------|--------------|--------------|
+| Linear read (4M T6 Q16)      | 13.98 GB/s   | 16.54 GB/s   |
+| Linear write (4M T6 Q16)     | 5.38 GB/s    | 5.7 GB/s     |
+| Read 4k T1 Q1                | 8969 iops    | 9980 iops    |
+| Write 4k T1 Q1               | 8126 iops    | 11672 iops   |
+| Read 4k T12 Q128             | 1358818 iops | 4279088 iops |
+| Write 4k T12 Q128            | 433890 iops  | 993506 iops  |
+
+CPU consumption OSD per 1 disk:
+
+|                              | TCP    | RDMA    |
+|------------------------------|--------|---------|
+| Linear read (4M T6 Q16)      | 24.9 % | 25.4 %  |
+| Linear write (4M T6 Q16)     | 99.3 % | 38.4 %  |
+| Read 4k T12 Q128             | 95.3 % | 111.7 % |
+| Write 4k T12 Q128            | 173 %  | 194 %   |
+
+CPU consumption per 1 client (fio):
+
+|                              | TCP    | RDMA   |
+|------------------------------|--------|--------|
+| Linear read (4M T6 Q16)      | 99.9 % | 85.8 % |
+| Linear write (4M T6 Q16)     | 38.9 % | 38.1 % |
+| Read 4k T12 Q128             | 100 %  | 96.1 % |
+| Write 4k T12 Q128            | 51.6 % | 41.9 % |
+
+## EC 2+1
+
+|                              | TCP          | RDMA         |
+|------------------------------|--------------|--------------|
+| Linear read (4M T6 Q16)      | 10.07 GB/s   | 11.43 GB/s   |
+| Linear write (4M T6 Q16)     | 7.74 GB/s    | 8.32 GB/s    |
+| Read 4k T1 Q1                | 7408 iops    | 8891 iops    |
+| Write 4k T1 Q1               | 3525 iops    | 4903 iops    |
+| Read 4k T12 Q128             | 1216496 iops | 2552765 iops |
+| Write 4k T12 Q128            | 278110 iops  | 821261 iops  |
+
+CPU consumption OSD per 1 disk:
+
+|                              | TCP     | RDMA    |
+|------------------------------|---------|---------|
+| Linear read (4M T6 Q16)      | 68.6 %  | 33.6 %  |
+| Linear write (4M T6 Q16)     | 108.3 % | 50.2 %  |
+| Read 4k T12 Q128             | 138.1 % | 97.9 %  |
+| Write 4k T12 Q128            | 168.7 % | 188.5 % |
+
+CPU consumption per 1 client (fio):
+
+|                              | TCP    | RDMA   |
+|------------------------------|--------|--------|
+| Linear read (4M T6 Q16)      | 88.2 % | 52.4 % |
+| Linear write (4M T6 Q16)     | 51.8 % | 46.8 % |
+| Read 4k T12 Q128             | 99.7 % | 61.3 % |
+| Write 4k T12 Q128            | 35.1 % | 31.3 % |

docs/performance/bench2.ru.md

@@ -0,0 +1,157 @@
+[Документация](../../README-ru.md#документация) → Производительность → Более новый тест Vitastor 1.3.1
+
+-----
+
+[Read in English](bench2.en.md)
+
+# Более новый тест Vitastor 1.3.1
+
+- [Описание стенда](#описание-стенда)
+- [Примечания](#примечания)
+- [Производительность голых дисков](#производительность-голых-дисков)
+- [2 реплики](#2-реплики)
+- [3 реплики](#3-реплики)
+- [EC 2+1](#ec-2-1)
+
+## Описание стенда
+
+Железо: 3 сервера, в каждом:
+- 8x NVMe Samsung PM9A3 1.92 TB
+- 2x Xeon Gold 6342 (24 ядра @ 2.8 GHz)
+- 256 GB RAM
+- Двухпортовая 25 GbE сетевая карта Mellanox ConnectX-4 LX с поддержкой RoCEv2
+- Подключение к 2 коммутаторам Mellanox SN2010 в MLAG
+
+## Примечания
+
+Версия Vitastor 1.3.1.
+
+Тесты проводились с самих серверов хранения - по 4 клиента fio с каждого из 3 серверов.
+
+Тестировался один большой образ размером 3 ТБ со всех хостов - создавать отдельные образы
+для тестов в Vitastor необязательно, т.к. в Vitastor нет замедления при записи в один
+узел несколькими клиентами.
+
+Экономия энергии CPU отключена. На каждый NVMe создавалось 4 OSD.
+Контрольные суммы не включались. Тесты с контрольными суммами будут проведены
+позднее. Тогда же будет протестирована более новая версия Vitastor, и результаты
+будут обновлены.
+
+Конфигурация CPU стенда неоптимальна из-за NUMA - двухпроцессорных серверов лучше
+избегать. Особенно это проявлялось во время тестов с RDMA - выражалось это в потреблении
+100% одного ядра CPU одним процессом ksoftirqd и работой одного из двух сетевых портов
+на скорости 3-5 ГБит/с вместо 25 ГБит/с - предположительно, из-за "непопаданий" RFS
+(Receive Flow Steering) на нужные ядра. Решить эту проблему во время проведения тестов
+не получилось. Было перепробовано множество различных настроек, но в итоге тесты проведены
+с настройками по умолчанию, т.к. улучшения добиться не удалось.
+
+# Производительность голых дисков
+
+- Линейная запись ~1000-2000 МБ/с, в зависимости от состояния сборщика мусора диска
+- Линейное чтение ~3300 МБ/с
+- T1Q1 запись ~60000 iops (задержка ~0.015ms)
+- T1Q1 чтение ~14700 iops (задержка ~0.066ms)
+- T1Q16 запись ~180000 iops
+- T1Q16 чтение ~120000 iops
+- T1Q32 запись ~180000 iops
+- T1Q32 чтение ~195000 iops
+- T1Q128 запись ~180000 iops
+- T1Q128 чтение ~195000 iops
+- T4Q128 запись ~525000 iops
+- T4Q128 чтение ~750000 iops
+
+Из данных цифр очевидно, что при наличии более быстрой сети результаты были бы
+значительно лучше, так как в диски тест, очевидно, не упирался. Например, теоретический предел по
+линейному чтению для 24 таких дисков был бы около 79.2 ГБайт/с, то есть,
+633 гигабита в секунду. Реальная скорость чтения (и случайного, и линейного)
+Vitastor составила примерно 16 ГБайт/с, то есть 130 гигабит в секунду. При этом
+следует заметить, что этот результат всё равно значительно лучше пропускной способности
+сети отдельно взятого узла - что тоже вполне логично, так как тест выполнялся со
+всех трёх узлов.
+
+## 2 реплики
+
+|                              | TCP          | RDMA         |
+|------------------------------|--------------|--------------|
+| Линейное чтение (4M T6 Q16)  | 13.13 ГБ/с   | 16.25 ГБ/с   |
+| Линейная запись (4M T6 Q16)  | 8.16 ГБ/с    | 7.88 ГБ/с    |
+| Чтение 4k T1 Q1              | 8745 iops    | 10252 iops   |
+| Запись 4k T1 Q1              | 8097 iops    | 11488 iops   |
+| Чтение 4k T12 Q128           | 1305936 iops | 4265861 iops |
+| Запись 4k T12 Q128           | 660490 iops  | 1384033 iops |
+
+Потребление CPU OSD на 1 диск:
+
+|                              | TCP     | RDMA    |
+|------------------------------|---------|---------|
+| Линейное чтение (4M T6 Q16)  | 29.7 %  | 29.8 %  |
+| Линейная запись (4M T6 Q16)  | 84.4 %  | 33.2 %  |
+| Чтение 4k T12 Q128           | 98.4 %  | 119.1 % |
+| Запись 4k T12 Q128           | 173.4 % | 175.9 % |
+
+Потребление CPU на 1 клиента (fio):
+
+|                              | TCP    | RDMA   |
+|------------------------------|--------|--------|
+| Линейное чтение (4M T6 Q16)  | 100 %  | 85.2 % |
+| Линейная запись (4M T6 Q16)  | 55.8 % | 48.8 % |
+| Чтение 4k T12 Q128           | 99.9 % | 96 %   |
+| Запись 4k T12 Q128           | 71.6 % | 48.5 % |
+
+## 3 реплики
+
+|                              | TCP          | RDMA         |
+|------------------------------|--------------|--------------|
+| Линейное чтение (4M T6 Q16)  | 13.98 ГБ/с   | 16.54 ГБ/с   |
+| Линейная запись (4M T6 Q16)  | 5.38 ГБ/с    | 5.7 ГБ/с     |
+| Чтение 4k T1 Q1              | 8969 iops    | 9980 iops    |
+| Запись 4k T1 Q1              | 8126 iops    | 11672 iops   |
+| Чтение 4k T12 Q128           | 1358818 iops | 4279088 iops |
+| Запись 4k T12 Q128           | 433890 iops  | 993506 iops  |
+
+Потребление CPU OSD на 1 диск:
+
+|                              | TCP    | RDMA    |
+|------------------------------|--------|---------|
+| Линейное чтение (4M T6 Q16)  | 24.9 % | 25.4 %  |
+| Линейная запись (4M T6 Q16)  | 99.3 % | 38.4 %  |
+| Чтение 4k T12 Q128           | 95.3 % | 111.7 % |
+| Запись 4k T12 Q128           | 173 %  | 194 %   |
+
+Потребление CPU на 1 клиента (fio):
+
+|                              | TCP    | RDMA   |
+|------------------------------|--------|--------|
+| Линейное чтение (4M T6 Q16)  | 99.9 % | 85.8 % |
+| Линейная запись (4M T6 Q16)  | 38.9 % | 38.1 % |
+| Чтение 4k T12 Q128           | 100 %  | 96.1 % |
+| Запись 4k T12 Q128           | 51.6 % | 41.9 % |
+
+## EC 2+1
+
+|                              | TCP          | RDMA         |
+|------------------------------|--------------|--------------|
+| Линейное чтение (4M T6 Q16)  | 10.07 ГБ/с   | 11.43 ГБ/с   |
+| Линейная запись (4M T6 Q16)  | 7.74 ГБ/с    | 8.32 ГБ/с    |
+| Чтение 4k T1 Q1              | 7408 iops    | 8891 iops    |
+| Запись 4k T1 Q1              | 3525 iops    | 4903 iops    |
+| Чтение 4k T12 Q128           | 1216496 iops | 2552765 iops |
+| Запись 4k T12 Q128           | 278110 iops  | 821261 iops  |
+
+Потребление CPU OSD на 1 диск:
+
+|                              | TCP     | RDMA    |
+|------------------------------|---------|---------|
+| Линейное чтение (4M T6 Q16)  | 68.6 %  | 33.6 %  |
+| Линейная запись (4M T6 Q16)  | 108.3 % | 50.2 %  |
+| Чтение 4k T12 Q128           | 138.1 % | 97.9 %  |
+| Запись 4k T12 Q128           | 168.7 % | 188.5 % |
+
+Потребление CPU на 1 клиента (fio):
+
+|                              | TCP    | RDMA   |
+|------------------------------|--------|--------|
+| Линейное чтение (4M T6 Q16)  | 88.2 % | 52.4 % |
+| Линейная запись (4M T6 Q16)  | 51.8 % | 46.8 % |
+| Чтение 4k T12 Q128           | 99.7 % | 61.3 % |
+| Запись 4k T12 Q128           | 35.1 % | 31.3 % |

docs/usage/admin.en.md

@@ -0,0 +1,215 @@
+[Documentation](../../README.md#documentation) → Usage → Administration
+
+-----
+
+[Читать на русском](admin.ru.md)
+
+# Administration
+
+- [Pool states](#pool-states)
+- [PG states](#pg-states)
+  - [Base PG states](#base-pg-states)
+  - [Additional PG states](#additional-pg-states)
+- [Removing a healthy disk](#removing-a-healthy-disk)
+- [Removing a failed disk](#removing-a-failed-disk)
+- [Adding a disk](#adding-a-disk)
+- [Restoring from lost pool configuration](#restoring-from-lost-pool-configuration)
+- [Upgrading Vitastor](#upgrading-vitastor)
+- [OSD memory usage](#osd-memory-usage)
+
+## Pool states
+
+Pool is active — that is, fully available for client input/output — when all its PGs are
+'active' (maybe with some additional state flags).
+
+If at least 1 PG is inactive, pool is also inactive and all clients suspend their I/O and
+wait until you fix the cluster. :-)
+
+## PG states
+
+PG states may be seen in [vitastor-cli status](cli.en.md#status) output.
+
+PG state consists of exactly 1 base state and an arbitrary number of additional states.
+
+### Base PG states
+
+PG state always includes exactly 1 of the following base states:
+- **active** — PG is active and handles user I/O.
+- **incomplete** — Not enough OSDs are available to activate this PG. That is, more disks
+  are lost than it's allowed by the pool's redundancy scheme. For example, if the pool has
+  pg_size=3 and pg_minsize=1, part of the data may be written only to 1 OSD. If that exact
+  OSD is lost, PG will become **incomplete**.
+- **offline** — PG isn't activated by any OSD at all. Either primary OSD isn't set for
+  this PG at all (if the pool is just created), or an unavailable OSD is set as primary,
+  or the primary OSD refuses to start this PG (for example, because of wrong block_size),
+  or the PG is stopped by the monitor using `pause: true` flag in `/vitastor/config/pgs` in etcd.
+- **starting** — primary OSD has acquired PG lock in etcd, PG is starting.
+- **peering** — primary OSD requests PG object listings from secondary OSDs and calculates
+  the PG state.
+- **repeering** — PG is waiting for current I/O operations to complete and will
+  then transition to **peering**.
+- **stopping** — PG is waiting for current I/O operations to complete and will
+  then transition to **offline** or be activated by another OSD.
+
+All states except **active** mean that PG is inactive and client I/O is suspended.
+
+**peering** state is normally visible only for a short period of time during OSD restarts
+and during switching primary OSD of PGs.
+
+**starting**, **repeering**, **stopping** states normally almost aren't visible at all.
+If you notice them for any noticeable time — chances are some operations on some OSDs hung.
+Search for "slow op" in OSD logs to find them — operations hung for more than
+[slow_log_interval](../config/osd.en.md#slow_log_interval) are logged as "slow ops".
+
+State transition diagram:
+
+![PG state transitions](pg_states.svg "PG state transitions")
+
+### Additional PG states
+
+If a PG is active it can also have any number of the following additional states:
+
+- **degraded** — PG is running on reduced number of drives (OSDs), redundancy of all
+  objects in this PG is reduced.
+- **has_incomplete** — some objects in this PG are incomplete (unrecoverable), that is,
+  they have too many lost EC parts (more than pool's [parity_chunks](../config/pool.en.md#parity_chunks)).
+- **has_degraded** — some objects in this PG have reduced redundancy
+  compared to the rest of the PG (so PG can be degraded+has_degraded at the same time).
+  These objects should be healed automatically by recovery process, unless
+  it's disabled by [no_recovery](../config/osd.en.md#no_recovery).
+- **has_misplaced** — some objects in this PG are stored on an OSD set different from
+  the target set of the PG. These objects should be moved automatically, unless
+  rebalance is disabled by [no_rebalance](../config/osd.en.md#no_rebalance). Objects
+  that are degraded and misplaced at the same time are treated as just degraded.
+- **has_unclean** — one more state normally noticeable only for very short time during
+  PG activation. It's used only with EC pools and means that some objects of this PG
+  have started but not finished modifications. All such objects are either quickly
+  committed or rolled back by the primary OSD when starting the PG, that is why the
+  state shouldn't be noticeable. If you notice it, it probably means that commit or
+  rollback operations are hung.
+- **has_invalid** — PG contains objects with incorrect part ID. Never occurs normally.
+  It can only occur if you delete a non-empty EC pool and then recreate it as a replica
+  pool or with smaller data part count.
+- **has_corrupted** — PG has corrupted objects, discovered by checking checksums during
+  read or during scrub. When possible, such objects should be recovered automatically.
+  If objects remain corrupted, use [vitastor-cli describe](cli.en.md#describe) to find
+  out details and/or look into the log of the primary OSD of the PG.
+- **has_inconsistent** — PG has objects with non-matching parts or copies on different OSDs,
+  and it's impossible to determine which copy is correct automatically. It may happen
+  if you use a pool with 2 replica and you don't enable checksums, and if data on one
+  of replicas becomes corrupted. You should also use vitastor-cli [describe](cli.en.md#describe)
+  and [fix](cli.en.md#fix) commands to remove the incorrect version in this case.
+- **left_on_dead** — part of the data of this PG is left on unavailable OSD that isn't
+  fully removed from the cluster. You should either start the corresponding OSD back and
+  let it remove the unneeded data or remove it from cluster using vitastor-cli
+  [rm-osd](cli.en.md#rm-osd) if you know that it's gone forever (for example, if the disk died).
+- **scrubbing** — data [scrub](../config/osd.en.md#auto_scrub) is running for this PG.
+
+## Removing a healthy disk
+
+Befor removing a healthy disk from the cluster set its OSD weight(s) to 0 to
+move data away. To do that, add `"reweight":0` to etcd key `/vitastor/config/osd/<OSD_NUMBER>`.
+For example:
+
+```
+etcdctl --endpoints=http://1.1.1.1:2379/v3 put /vitastor/config/osd/1 '{"reweight":0}'
+```
+
+Then wait until rebalance finishes and remove OSD by running `vitastor-disk purge /dev/vitastor/osdN-data`.
+
+## Removing a failed disk
+
+If a disk is already dead, its OSD(s) are likely already stopped.
+
+In this case just remove OSD(s) from the cluster by running `vitastor-cli rm-osd OSD_NUMBER`.
+
+## Adding a disk
+
+If you're adding a server, first install Vitastor packages and copy the
+`/etc/vitastor/vitastor.conf` configuration file to it.
+
+After that you can just run `vitastor-disk prepare /dev/nvmeXXX`, of course with
+the same parameters which you used for other OSDs in your cluster before.
+
+## Restoring from lost pool configuration
+
+If you remove or corrupt `/vitastor/config/pools` key in etcd all pools will
+be deleted. Don't worry, the data won't be lost, but you'll need to perform
+a specific recovery procedure.
+
+First you need to restore previous configuration of the pool with the same ID
+and EC/replica parameters and wait until pool PGs appear in `vitastor-cli status`.
+
+Then add all OSDs into the history records of all PGs. You can do it by running
+the following script (just don't forget to use your own PG_COUNT and POOL_ID):
+
+```
+PG_COUNT=32
+POOL_ID=1
+ALL_OSDS=$(etcdctl --endpoints=your_etcd_address:2379 get --keys-only --prefix /vitastor/osd/stats/ | \
+    perl -e '$/ = undef; $a = <>; $a =~ s/\s*$//; $a =~ s!/vitastor/osd/stats/!!g; $a =~ s/\s+/,/g; print $a')
+for i in $(seq 1 $PG_COUNT); do
+    etcdctl --endpoints=your_etcd_address:2379 put /vitastor/pg/history/$POOL_ID/$i '{"all_peers":['$ALL_OSDS']}'; done
+done
+```
+
+After that all PGs should peer and find all previous data.
+
+## Upgrading Vitastor
+
+Every upcoming Vitastor version is usually compatible with previous both forward
+and backward regarding the network protocol and etcd data structures.
+
+So, by default, if this page doesn't contain explicit different instructions, you
+can upgrade your Vitastor cluster by simply upgrading packages and restarting all
+OSDs and monitors in any order.
+
+Upgrading is performed without stopping clients (VMs/containers), you just need to
+upgrade and restart servers one by one. However, ideally you should restart VMs too
+to make them use the new version of the client library.
+
+Exceptions (specific upgrade instructions):
+- Upgrading <= 1.1.x to 1.2.0 or later, if you use EC n+k with k>=2, is recommended
+  to be performed with full downtime: first you should stop all clients, then all OSDs,
+  then upgrade and start everything back — because versions before 1.2.0 have several
+  bugs leading to invalid data being read in EC n+k, k>=2 configurations in degraded pools.
+- Versions <= 0.8.7 are incompatible with versions >= 0.9.0, so you should first
+  upgrade from <= 0.8.7 to 0.8.8 or 0.8.9, and only then to >= 0.9.x. If you upgrade
+  without this intermediate step, client I/O will hang until the end of upgrade process.
+- Upgrading from <= 0.5.x to >= 0.6.x is not supported.
+
+Rollback:
+- Version 1.0.0 has a new disk format, so OSDs initiaziled on 1.0.0 can't be rolled
+  back to 0.9.x or previous versions.
+- Versions before 0.8.0 don't have vitastor-disk, so OSDs, initialized by it, won't
+  start with 0.7.x or 0.6.x. :-)
+
+## OSD memory usage
+
+OSD uses RAM mainly for:
+
+- Metadata index: `data_size`/[`block_size`](../config/layout-cluster.en.md#block_size) * `approximately 1.1` * `32` bytes.
+  Consumed always.
+- Copy of the on-disk metadata area: `data_size`/[`block_size`](../config/layout-cluster.en.md#block_size) * `28` bytes.
+  Consumed if [inmemory_metadata](../config/osd.en.md#inmemory_metadata) isn't disabled.
+- Bitmaps: `data_size`/[`bitmap_granularity`](../config/layout-cluster.en.md#bitmap_granularity)/`8` * `2` bytes.
+  Consumed always.
+- Journal index: between 0 and, approximately, journal size. Consumed always.
+- Copy of the on-disk journal area: exactly journal size. Consumed if
+  [inmemory_journal](../config/osd.en.md#inmemory_journal) isn't disabled.
+- Checksums: `data_size`/[`csum_block_size`](../config/osd.en.md#csum_block_size) * 4 bytes.
+  Consumed if checksums are enabled and [inmemory_metadata](../config/osd.en.md#inmemory_metadata) isn't disabled.
+
+bitmap_granularity is almost always 4 KB.
+
+So with default SSD settings (block_size=128k, journal_size=32M, csum_block_size=4k) memory usage is:
+
+- Metadata and bitmaps: ~600 MB per 1 TB of data.
+- Journal: up to 64 MB per 1 OSD.
+- Checksums: 1 GB per 1 TB of data.
+
+With default HDD settings (block_size=1M, journal_size=128M, csum_block_size=32k):
+
+- Metadata and bitmaps: ~128 MB per 1 TB of data.
+- Journal: up to 256 MB per 1 OSD.
+- Checksums: 128 MB per 1 TB of data.

docs/usage/admin.ru.md

@@ -0,0 +1,211 @@
+[Документация](../../README-ru.md#документация) → Использование → Администрирование
+
+-----
+
+[Read in English](admin.en.md)
+
+# Администрирование
+
+- [Состояния пулов](#состояния-пулов)
+- [Состояния PG](#состояния-pg)
+  - [Базовые состояния PG](#базовые-состояния-pg)
+  - [Дополнительные состояния PG](#дополнительные-состояния-pg)
+- [Удаление исправного диска](#удаление-исправного-диска)
+- [Удаление неисправного диска](#удаление-неисправного-диска)
+- [Добавление диска](#добавление-диска)
+- [Восстановление потерянной конфигурации пулов](#восстановление-потерянной-конфигурации-пулов)
+- [Обновление Vitastor](#обновление-vitastor)
+- [Потребление памяти OSD](#потребление-памяти-osd)
+
+## Состояния пулов
+
+Пул активен — то есть, полностью доступен для клиентского ввода-вывода — когда все его PG
+активны, то есть, имеют статус active, возможно, с любым набором дополнительных флагов.
+
+Если хотя бы 1 PG неактивна, пул неактивен и все клиенты зависают и ждут, пока вы почините
+кластер. :-)
+
+## Состояния PG
+
+Вы можете видеть состояния PG в выводе команды [vitastor-cli status](cli.ru.md#status).
+
+Состояние PG состоит из ровно 1 базового флага состояния, плюс любого числа дополнительных.
+
+### Базовые состояния PG
+
+Состояние PG включает в себя ровно 1 флаг из следующих:
+- **active** — PG активна и обрабатывает запросы ввода-вывода от пользователей.
+- **incomplete** — Недостаточно живых OSD, чтобы включить эту PG.
+  То есть, дисков потеряно больше, чем разрешено схемой отказоустойчивости пула и pg_minsize.
+  Например, если у пула pg_size=3 и pg_minsize=1, то часть данных может записаться всего на 1 OSD.
+  Если потом конкретно этот OSD упадёт, PG окажется **incomplete**.
+- **offline** — PG вообще не активирована ни одним OSD. Либо первичный OSD не назначен вообще
+  (если пул только создан), либо в качестве первичного назначен недоступный OSD, либо
+  назначенный OSD отказывается запускать эту PG (например, из-за несовпадения block_size),
+  либо PG остановлена монитором через флаг `pause: true` в `/vitastor/config/pgs` в etcd.
+- **starting** — первичный OSD захватил блокировку PG в etcd, PG запускается.
+- **peering** — первичный OSD опрашивает вторичные OSD на предмет списков объектов данной PG и рассчитывает её состояние.
+- **repeering** — PG ожидает завершения текущих операций ввода-вывода, после чего перейдёт в состояние **peering**.
+- **stopping** — PG ожидает завершения текущих операций ввода-вывода, после чего перейдёт в состояние **offline** или поднимется на другом OSD.
+
+Все состояния, кроме **active**, означают, что PG неактивна и ввод-вывод приостановлен.
+
+Состояние **peering** в норме заметно только при перезапуске OSD или переключении первичных
+OSD, на протяжении небольшого периода времени.
+
+Состояния **starting**, **repeering**, **stopping** в норме практически не заметны вообще,
+PG должны очень быстро переходить из них в другие. Если эти состояния заметны
+хоть сколько-то значительное время — вероятно, какие-то операции на каких-то OSD зависли.
+Чтобы найти их, ищите "slow op" в журналах OSD — операции, зависшие дольше,
+чем на [slow_log_interval](../config/osd.ru.md#slow_log_interval), записываются в
+журналы OSD как "slow op".
+
+Диаграмма переходов:
+
+![Диаграмма переходов](pg_states.svg "Диаграмма переходов")
+
+### Дополнительные состояния PG
+
+Если PG активна, она также может иметь любое число дополнительных флагов состояний:
+
+- **degraded** — PG поднята на неполном числе дисков (OSD), избыточность хранения всех объектов снижена.
+- **has_incomplete** — часть объектов в PG неполные (невосстановимые), то есть, у них потеряно
+  слишком много EC-частей (больше, чем [parity_chunks](../config/pool.ru.md#parity_chunks) пула).
+- **has_degraded** — часть объектов в PG деградированы, избыточность их хранения снижена по сравнению
+  с остальным содержимым данной PG (то есть, PG может одновременно быть degraded+has_degraded).
+  Данные объекты должны восстановиться автоматически, если только восстановление не отключено
+  через [no_recovery](../config/osd.ru.md#no_recovery).
+- **has_misplaced** — часть объектов в PG сейчас расположена не на целевом наборе OSD этой PG.
+  Данные объекты должны переместиться автоматически, если только перебалансировка не отключена
+  через [no_rebalance](../config/osd.ru.md#no_rebalance). Объекты, являющиеся одновременно
+  degraded и misplaced, считаются просто degraded.
+- **has_unclean** — ещё одно состояние, в норме заметное только очень короткое время при поднятии PG.
+  Применяется только к EC и означает, что на каких-то OSD этой PG есть EC-части объектов, для которых
+  был начат, но не завершён процесс записи. Все такие объекты первичный OSD либо завершает, либо
+  откатывает при поднятии PG первым делом, поэтому состояние и не должно быть заметно. Опять-таки,
+  если оно заметно — значит, скорее всего, операции отката или завершения записи на каких-то OSD зависли.
+- **has_invalid** — в PG найдены объекты с некорректными ID части. В норме не проявляется вообще
+  никогда, проявляется только если, не удалив данные, создать на месте EC-пула либо реплика-пул,
+  либо EC-пул с меньшим числом частей данных.
+- **has_corrupted** — в PG есть повреждённые объекты, обнаруженные с помощью контрольных сумм или
+  скраба (сверки копий). Если объекты можно восстановить, они восстановятся автоматически. Если
+  не восстанавливаются, используйте команду [vitastor-cli describe](cli.ru.md#describe) для
+  выяснения деталей и/или смотрите в журнал первичного OSD данной PG.
+- **has_inconsistent** — в PG есть объекты, у которых не совпадают копии/части данных на разных OSD,
+  и при этом автоматически определить, какая копия верная, а какая нет, невозможно. Такое может
+  произойти, если вы используете 2 реплики, не включали контрольные суммы, и на одной из реплик
+  данные повредились. В этом случае тоже надо использовать команды vitastor-cli [describe](cli.ru.md#describe)
+  и [fix](cli.ru.md#fix) для удаления некорректной версии.
+- **left_on_dead** — часть данных PG осталась на отключённом, но не удалённом из кластера окончательно,
+  OSD. Вам нужно либо вернуть соответствующий OSD в строй и дать ему очистить лишние данные, либо
+  удалить его из кластера окончательно с помощью vitastor-cli [rm-osd](cli.ru.md#rm-osd), если
+  известно, что он уже не вернётся (например, если умер диск).
+- **scrubbing** — идёт фоновая проверка данных PG ([скраб](../config/osd.ru.md#auto_scrub)).
+
+## Удаление исправного диска
+
+Перед удалением исправного диска из кластера установите его OSD вес в 0, чтобы убрать с него данные.
+Для этого добавьте в ключ `/vitastor/config/osd/<НОМЕР_OSD>` в etcd значение `"reweight":0`, например:
+
+```
+etcdctl --endpoints=http://1.1.1.1:2379/v3 put /vitastor/config/osd/1 '{"reweight":0}'
+```
+
+Дождитесь завершения ребаланса, после чего удалите OSD командой `vitastor-disk purge /dev/vitastor/osdN-data`.
+
+## Удаление неисправного диска
+
+Если диск уже умер, его OSD, скорее всего, уже будет/будут остановлен(ы).
+
+В этом случае просто удалите OSD из etcd командой `vitastor-cli rm-osd НОМЕР_OSD`.
+
+## Добавление диска
+
+Если сервер новый, установите на него пакеты Vitastor и скопируйте файл конфигурации
+`/etc/vitastor/vitastor.conf`.
+
+После этого достаточно выполнить команду `vitastor-disk prepare /dev/nvmeXXX`, разумеется,
+с параметрами, аналогичными другим OSD в вашем кластере.
+
+## Восстановление потерянной конфигурации пулов
+
+Если удалить или повредить ключ `/vitastor/config/pools` в etcd, все пулы будут удалены.
+Не волнуйтесь, данные потеряны не будут, но вам нужно будет провести специальную
+процедуру восстановления.
+
+Сначала нужно будет восстановить конфигурацию пулов, создав пул с таким же ID и
+с такими же параметрами EC/реплик, и подождать, пока PG пула появятся в `vitastor-cli status`.
+
+Далее нужно будет добавить все OSD в исторические записи всех PG. Примерно так
+(только подставьте свои PG_COUNT и POOL_ID):
+
+```
+PG_COUNT=32
+POOL_ID=1
+ALL_OSDS=$(etcdctl --endpoints=your_etcd_address:2379 get --keys-only --prefix /vitastor/osd/stats/ | \
+    perl -e '$/ = undef; $a = <>; $a =~ s/\s*$//; $a =~ s!/vitastor/osd/stats/!!g; $a =~ s/\s+/,/g; print $a')
+for i in $(seq 1 $PG_COUNT); do
+    etcdctl --endpoints=your_etcd_address:2379 put /vitastor/pg/history/$POOL_ID/$i '{"all_peers":['$ALL_OSDS']}'; done
+done
+```
+
+После этого все PG должны пройти peering и найти все предыдущие данные.
+
+## Обновление Vitastor
+
+Обычно каждая следующая версия Vitastor совместима с предыдущими и "вперёд", и "назад"
+с точки зрения сетевого протокола и структур данных в etcd.
+
+Так что по умолчанию, если на данной странице не указано обратное, считается, что для
+обновления достаточно обновить пакеты и перезапустить все OSD и мониторы Vitastor в
+произвольном порядке.
+
+Обновление производится без остановки клиентов (виртуальных машин/контейнеров), для этого
+достаточно обновлять серверы по одному. Однако, конечно, чтобы запущенные виртуальные машины
+начали использовать новую версию клиентской библиотеки, их тоже нужно перезапустить.
+
+Исключения (особые указания при обновлении):
+- Обновляться с версий <= 1.1.x до версий >= 1.2.0, если вы используете EC n+k и k>=2,
+  рекомендуется с временной остановкой кластера — сначала нужно остановить всех клиентов,
+  потом все OSD, потом обновить и запустить всё обратно — из-за нескольких багов, которые
+  могли приводить к некорректному чтению данных в деградированных EC-пулах.
+- Версии <= 0.8.7 несовместимы с версиями >= 0.9.0, поэтому при обновлении с <= 0.8.7
+  нужно сначала обновиться до 0.8.8 или 0.8.9, а уже потом до любых версий >= 0.9.x.
+  Иначе клиентский ввод-вывод зависнет до завершения обновления.
+- Обновление с версий 0.5.x и более ранних до 0.6.x и более поздних не поддерживается.
+
+Откат:
+- В версии 1.0.0 поменялся дисковый формат, поэтому OSD, созданные на версии >= 1.0.0,
+  нельзя откатить до версии 0.9.x и более ранних.
+- В версиях ранее 0.8.0 нет vitastor-disk, значит, созданные им OSD нельзя откатить
+  до 0.7.x или 0.6.x. :-)
+
+## Потребление памяти OSD
+
+Основное потребление памяти складывается из:
+
+- Индекс метаданных: `размер_данных`/[`block_size`](../config/layout-cluster.ru.md#block_size) * `примерно 1.1` * `32` байт.
+  Потребляется всегда.
+- Копия дисковой области метаданных: `размер_данных`/[`block_size`](../config/layout-cluster.ru.md#block_size) * `28` байт.
+  Потребляется, если не отключена настройка [inmemory_metadata](../config/osd.ru.md#inmemory_metadata).
+- Битмапы: `размер_данных`/[`bitmap_granularity`](../config/layout-cluster.ru.md#bitmap_granularity)/`8` * `2` байт.
+  Потребляется всегда.
+- Индекс журнала: от 0 до, приблизительно, размера журнала. Потребляется всегда.
+- Копия дисковой области журнала: в точности размер журнала. Потребляется,
+  если не отключена настройка [inmemory_journal](../config/osd.ru.md#inmemory_journal).
+- Контрольные суммы: `размер_данных`/[`csum_block_size`](../config/osd.ru.md#csum_block_size) * `4` байт.
+  Потребляется, если включены контрольные суммы и не отключена настройка [inmemory_metadata](../config/osd.ru.md#inmemory_metadata).
+
+bitmap_granularity, как правило, никогда не меняется и равен 4 килобайтам.
+
+Таким образом, при SSD-настройках по умолчанию (block_size=128k, journal_size=32M, csum_block_size=4k) потребляется:
+
+- Метаданные и битмапы: ~600 МБ на 1 ТБ данных
+- Журнал: до 64 МБ на 1 OSD
+- Контрольные суммы: 1 ГБ на 1 ТБ данных
+
+При HDD-настройках по умолчанию (block_size=1M, journal_size=128M, csum_block_size=32k):
+
+- Метаданные и битмапы: ~128 МБ на 1 ТБ данных
+- Журнал: до 256 МБ на 1 OSD
+- Контрольные суммы: 128 МБ на 1 ТБ данных

docs/usage/cli.en.md

@@ -24,6 +24,10 @@ It supports the following commands:
 - [fix](#fix)
 - [alloc-osd](#alloc-osd)
 - [rm-osd](#rm-osd)
+- [create-pool](#create-pool)
+- [modify-pool](#modify-pool)
+- [ls-pools](#ls-pools)
+- [rm-pool](#rm-pool)
 
 Global options:
 
@@ -131,19 +135,18 @@ See also about [how to export snapshots](qemu.en.md#exporting-snapshots).
 
 ## modify
 
-`vitastor-cli modify <name> [--rename <new-name>] [--resize <size>] [--readonly | --readwrite] [-f|--force]`
+`vitastor-cli modify <name> [--rename <new-name>] [--resize <size>] [--readonly | --readwrite] [-f|--force] [--down-ok]`
 
 Rename, resize image or change its readonly status. Images with children can't be made read-write.
 If the new size is smaller than the old size, extra data will be purged.
 You should resize file system in the image, if present, before shrinking it.
 
-```
--f|--force  Proceed with shrinking or setting readwrite flag even if the image has children.
-```
+* `-f|--force` - Proceed with shrinking or setting readwrite flag even if the image has children.
+* `--down-ok` - Proceed with shrinking even if some data will be left on unavailable OSDs.
 
 ## rm
 
-`vitastor-cli rm <from> [<to>] [--writers-stopped]`
+`vitastor-cli rm <from> [<to>] [--writers-stopped] [--down-ok]`
 
 Remove `<from>` or all layers between `<from>` and `<to>` (`<to>` must be a child of `<from>`),
 rebasing all their children accordingly. --writers-stopped allows merging to be a bit
@@ -151,6 +154,10 @@ more effective in case of a single 'slim' read-write child and 'fat' removed par
 the child is merged into parent and parent is renamed to child in that case.
 In other cases parent layers are always merged into children.
 
+Other options:
+
+* `--down-ok` - Continue deletion/merging even if some data will be left on unavailable OSDs.
+
 ## flatten
 
 `vitastor-cli flatten <layer>`
@@ -238,3 +245,91 @@ Refuses to remove OSDs with data without `--force` and `--allow-data-loss`.
 
 With `--dry-run` only checks if deletion is possible without data loss and
 redundancy degradation.
+
+## create-pool
+
+`vitastor-cli create-pool|pool-create <name> (-s <pg_size>|--ec <N>+<K>) -n <pg_count> [OPTIONS]`
+
+Create a pool. Required parameters:
+
+| <!-- -->                 | <!-- -->                                                                              |
+|--------------------------|---------------------------------------------------------------------------------------|
+| `-s R` or `--pg_size R`  | Number of replicas for replicated pools                                               |
+| `--ec N+K`               | Number of data (N) and parity (K) chunks for erasure-coded pools                      |
+| `-n N` or `--pg_count N` | PG count for the new pool (start with 10*<OSD count>/pg_size rounded to a power of 2) |
+
+Optional parameters:
+
+| <!-- -->                       | <!-- -->                                                                   |
+|--------------------------------|----------------------------------------------------------------------------|
+| `--pg_minsize <number>`        | R or N+K minus number of failures to tolerate without downtime ([details](../config/pool.en.md#pg_minsize)) |
+| `--failure_domain host`        | Failure domain: host, osd or a level from placement_levels. Default: host  |
+| `--root_node <node>`           | Put pool only on child OSDs of this placement tree node                    |
+| `--osd_tags <tag>[,<tag>]...`  | Put pool only on OSDs tagged with all specified tags                       |
+| `--block_size 128k`            | Put pool only on OSDs with this data block size                            |
+| `--bitmap_granularity 4k`      | Put pool only on OSDs with this logical sector size                        |
+| `--immediate_commit none`      | Put pool only on OSDs with this or larger immediate_commit (none < small < all) |
+| `--primary_affinity_tags tags` | Prefer to put primary copies on OSDs with all specified tags               |
+| `--scrub_interval <time>`      | Enable regular scrubbing for this pool. Format: number + unit s/m/h/d/M/y  |
+| `--used_for_fs <name>`         | Mark pool as used for VitastorFS with metadata in image <name>             |
+| `--pg_stripe_size <number>`    | Increase object grouping stripe                                            |
+| `--max_osd_combinations 10000` | Maximum number of random combinations for LP solver input                  |
+| `--wait`                       | Wait for the new pool to come online                                       |
+| `-f` or `--force`              | Do not check that cluster has enough OSDs to create the pool               |
+
+See also [Pool configuration](../config/pool.en.md) for detailed parameter descriptions.
+
+Examples:
+
+`vitastor-cli create-pool test_x4 -s 4 -n 32`
+
+`vitastor-cli create-pool test_ec42 --ec 4+2 -n 32`
+
+## modify-pool
+
+`vitastor-cli modify-pool|pool-modify <id|name> [--name <new_name>] [PARAMETERS...]`
+
+Modify an existing pool. Modifiable parameters:
+
+```
+[-s|--pg_size <number>] [--pg_minsize <number>] [-n|--pg_count <count>]
+[--failure_domain <level>] [--root_node <node>] [--osd_tags <tags>] [--no_inode_stats 0|1]
+[--max_osd_combinations <number>] [--primary_affinity_tags <tags>] [--scrub_interval <time>]
+```
+
+Non-modifiable parameters (changing them WILL lead to data loss):
+
+```
+[--block_size <size>] [--bitmap_granularity <size>]
+[--immediate_commit <all|small|none>] [--pg_stripe_size <size>]
+```
+
+These, however, can still be modified with -f|--force.
+
+See [create-pool](#create-pool) for parameter descriptions.
+
+Examples:
+
+`vitastor-cli modify-pool pool_A --name pool_B`
+
+`vitastor-cli modify-pool 2 --pg_size 4 -n 128`
+
+## rm-pool
+
+`vitastor-cli rm-pool|pool-rm [--force] <id|name>`
+
+Remove a pool. Refuses to remove pools with images without `--force`.
+
+## ls-pools
+
+`vitastor-cli ls-pools|pool-ls|ls-pool|pools [-l] [--detail] [--sort FIELD] [-r] [-n N] [--stats] [<glob> ...]`
+
+List pools (only matching <glob> patterns if passed).
+
+| <!-- -->             | <!-- -->                                              |
+|----------------------|-------------------------------------------------------|
+| `-l` or `--long`     | Also report I/O statistics                            |
+| `--detail`           | Use list format (not table), show all details         |
+| `--sort FIELD`       | Sort by specified field (see fields in --json output) |
+| `-r` or `--reverse`  | Sort in descending order                              |
+| `-n` or `--count N`  | Only list first N items                               |

docs/usage/cli.ru.md

@@ -23,6 +23,10 @@ vitastor-cli - интерфейс командной строки для адм
 - [merge-data](#merge-data)
 - [alloc-osd](#alloc-osd)
 - [rm-osd](#rm-osd)
+- [create-pool](#create-pool)
+- [modify-pool](#modify-pool)
+- [ls-pools](#ls-pools)
+- [rm-pool](#rm-pool)
 
 Глобальные опции:
 
@@ -85,8 +89,8 @@ kaveri    2/1     32   0 B      10 G    0 B        100%    0%
 
 `vitastor-cli ls [-l] [-p POOL] [--sort FIELD] [-r] [-n N] [<glob> ...]`
 
-Показать список образов, если переданы шаблоны `<glob>`, то только с именами,
-соответствующими этим шаблонам (стандартные ФС-шаблоны с * и ?).
+Показать список образов, если передан(ы) шаблон(ы) `<glob>`, то только с именами,
+соответствующими одному из шаблонов (стандартные ФС-шаблоны с * и ?).
 
 Опции:
 
@@ -132,7 +136,7 @@ vitastor-cli snap-create [-p|--pool <id|name>] <image>@<snapshot>
 
 ## modify
 
-`vitastor-cli modify <name> [--rename <new-name>] [--resize <size>] [--readonly | --readwrite] [-f|--force]`
+`vitastor-cli modify <name> [--rename <new-name>] [--resize <size>] [--readonly | --readwrite] [-f|--force] [--down-ok]`
 
 Изменить размер, имя образа или флаг "только для чтения". Снимать флаг "только для чтения"
 и уменьшать размер образов, у которых есть дочерние клоны, без `--force` нельзя.
@@ -140,13 +144,12 @@ vitastor-cli snap-create [-p|--pool <id|name>] <image>@<snapshot>
 Если новый размер меньше старого, "лишние" данные будут удалены, поэтому перед уменьшением
 образа сначала уменьшите файловую систему в нём.
 
-```
--f|--force  Разрешить уменьшение или перевод в чтение-запись образа, у которого есть клоны.
-```
+* `-f|--force` - Разрешить уменьшение или перевод в чтение-запись образа, у которого есть клоны.
+* `--down-ok` - Разрешить уменьшение, даже если часть данных останется неудалённой на недоступных OSD.
 
 ## rm
 
-`vitastor-cli rm <from> [<to>] [--writers-stopped]`
+`vitastor-cli rm <from> [<to>] [--writers-stopped] [--down-ok]`
 
 Удалить образ `<from>` или все слои от `<from>` до `<to>` (`<to>` должен быть дочерним
 образом `<from>`), одновременно меняя родительские образы их клонов (если таковые есть).
@@ -158,6 +161,10 @@ vitastor-cli snap-create [-p|--pool <id|name>] <image>@<snapshot>
 
 В других случаях родительские слои вливаются в дочерние.
 
+Другие опции:
+
+* `--down-ok` - Продолжать удаление/слияние, даже если часть данных останется неудалённой на недоступных OSD.
+
 ## flatten
 
 `vitastor-cli flatten <layer>`
@@ -255,3 +262,91 @@ vitastor-cli snap-create [-p|--pool <id|name>] <image>@<snapshot>
 
 С опцией `--dry-run` только проверяет, возможно ли удаление без потери данных и деградации
 избыточности.
+
+## create-pool
+
+`vitastor-cli create-pool|pool-create <name> (-s <pg_size>|--ec <N>+<K>) -n <pg_count> [OPTIONS]`
+
+Создать пул. Обязательные параметры:
+
+| <!-- -->                  | <!-- -->                                                                                    |
+|---------------------------|---------------------------------------------------------------------------------------------|
+| `-s R` или `--pg_size R`  | Число копий данных для реплицированных пулов                                                |
+| `--ec N+K`                | Число частей данных (N) и чётности (K) для пулов с кодами коррекции ошибок                  |
+| `-n N` или `--pg_count N` | Число PG для нового пула (начните с 10*<число OSD>/pg_size, округлённого до степени двойки) |
+
+Необязательные параметры:
+
+| <!-- -->                       | <!-- -->                                                                   |
+|--------------------------------|----------------------------------------------------------------------------|
+| `--pg_minsize <number>`        | (R или N+K) минус число разрешённых отказов без остановки пула ([подробнее](../config/pool.ru.md#pg_minsize)) |
+| `--failure_domain host`        | Домен отказа: host, osd или другой из placement_levels. По умолчанию: host |
+| `--root_node <node>`           | Использовать для пула только дочерние OSD этого узла дерева размещения     |
+| `--osd_tags <tag>[,<tag>]...`  | ...только OSD со всеми заданными тегами                                    |
+| `--block_size 128k`            | ...только OSD с данным размером блока                                      |
+| `--bitmap_granularity 4k`      | ...только OSD с данным размером логического сектора                        |
+| `--immediate_commit none`      | ...только OSD с этим или большим immediate_commit (none < small < all)     |
+| `--primary_affinity_tags tags` | Предпочитать OSD со всеми данными тегами для роли первичных                |
+| `--scrub_interval <time>`      | Включить скрабы с заданным интервалом времени (число + единица s/m/h/d/M/y) |
+| `--pg_stripe_size <number>`    | Увеличить блок группировки объектов по PG                                  |
+| `--max_osd_combinations 10000` | Максимальное число случайных комбинаций OSD для ЛП-солвера                 |
+| `--wait`                       | Подождать, пока новый пул будет активирован                                |
+| `-f` или `--force`             | Не проверять, что в кластере достаточно доменов отказа для создания пула   |
+
+Подробно о параметрах см. [Конфигурация пулов](../config/pool.ru.md).
+
+Примеры:
+
+`vitastor-cli create-pool test_x4 -s 4 -n 32`
+
+`vitastor-cli create-pool test_ec42 --ec 4+2 -n 32`
+
+## modify-pool
+
+`vitastor-cli modify-pool|pool-modify <id|name> [--name <new_name>] [PARAMETERS...]`
+
+Изменить настройки существующего пула. Изменяемые параметры:
+
+```
+[-s|--pg_size <number>] [--pg_minsize <number>] [-n|--pg_count <count>]
+[--failure_domain <level>] [--root_node <node>] [--osd_tags <tags>]
+[--max_osd_combinations <number>] [--primary_affinity_tags <tags>] [--scrub_interval <time>]
+```
+
+Неизменяемые параметры (их изменение ПРИВЕДЁТ к потере данных):
+
+```
+[--block_size <size>] [--bitmap_granularity <size>]
+[--immediate_commit <all|small|none>] [--pg_stripe_size <size>]
+```
+
+Эти параметры можно изменить, только если явно передать опцию -f или --force.
+
+Описания параметров смотрите в [create-pool](#create-pool).
+
+Примеры:
+
+`vitastor-cli modify-pool pool_A --name pool_B`
+
+`vitastor-cli modify-pool 2 --pg_size 4 -n 128`
+
+## rm-pool
+
+`vitastor-cli rm-pool|pool-rm [--force] <id|name>`
+
+Удалить пул. Отказывается удалять пул, в котором ещё есть образы, без `--force`.
+
+## ls-pools
+
+`vitastor-cli ls-pools|pool-ls|ls-pool|pools [-l] [--detail] [--sort FIELD] [-r] [-n N] [--stats] [<glob> ...]`
+
+Показать список пулов. Если передан(ы) шаблон(ы) `<glob>`, то только с именами,
+соответствующими одному из шаблонов (стандартные ФС-шаблоны с * и ?).
+
+| <!-- -->              | <!-- -->                                                   |
+|-----------------------|------------------------------------------------------------|
+| `-l` или `--long`     | Вывести также статистику ввода-вывода                      |
+| `--detail`            | Максимально подробный вывод в виде списка (а не таблицы)   |
+| `--sort FIELD`        | Сортировать по заданному полю (поля см. в выводе с --json) |
+| `-r` или `--reverse`  | Сортировать в обратном порядке                             |
+| `-n` или `--count N`  | Выводить только первые N записей                           |

docs/usage/disk.en.md

@@ -88,7 +88,7 @@ Options (both modes):
 --block_size 1M/128k       Set blockstore object size
 --bitmap_granularity 4k    Set bitmap granularity
 --data_csum_type none      Set data checksum type (crc32c or none)
---csum_block_size 4k       Set data checksum block size
+--csum_block_size 4k/32k   Set data checksum block size (SSD/HDD default)
 --data_device_block 4k     Override data device block size
 --meta_device_block 4k     Override metadata device block size
 --journal_device_block 4k  Override journal device block size

docs/usage/disk.ru.md

@@ -89,7 +89,7 @@ vitastor-disk - инструмент командной строки для уп
 --block_size 1M/128k       Задать размер объекта хранилища
 --bitmap_granularity 4k    Задать гранулярность битовых карт
 --data_csum_type none      Задать тип контрольных сумм (crc32c или none)
---csum_block_size 4k       Задать размер блока расчёта контрольных сумм
+--csum_block_size 4k/32k   Задать размер блока расчёта контрольных сумм (дефолт SSD/HDD)
 --data_device_block 4k     Задать размер блока устройства данных
 --meta_device_block 4k     Задать размер блока метаданных
 --journal_device_block 4k  Задать размер блока журнала

docs/usage/nfs.en.md

@@ -1,45 +1,153 @@
-[Documentation](../../README.md#documentation) → Usage → NFS
+[Documentation](../../README.md#documentation) → Usage → VitastorFS and pseudo-FS
 
 -----
 
 [Читать на русском](nfs.ru.md)
 
-# NFS
+# VitastorFS and pseudo-FS
 
-Vitastor has a simplified NFS 3.0 proxy for file-based image access emulation. It's not
-suitable as a full-featured file system, at least because all file/image metadata is stored
-in etcd and kept in memory all the time - thus you can't put a lot of files in it.
+Vitastor has two file system implementations. Both can be used via `vitastor-nfs`.
 
-However, NFS proxy is totally fine as a method to provide VM image access and allows to
-plug Vitastor into, for example, VMWare. It's important to note that for VMWare it's a much
-better access method than iSCSI, because with iSCSI we'd have to put all VM images into one
-Vitastor image exported as a LUN to VMWare and formatted with VMFS. VMWare doesn't use VMFS
-over NFS.
+Commands:
+- [mount](#mount)
+- [start](#start)
 
-NFS proxy is stateless if you use immediate_commit=all mode (for SSD with capacitors or
-HDDs with disabled cache), so you can run multiple NFS proxies and use a network load
-balancer or any failover method you want to in that case.
+## Pseudo-FS
 
-vitastor-nfs usage:
+Simplified pseudo-FS proxy is used for file-based image access emulation. It's not
+suitable as a full-featured file system: it lacks a lot of FS features, it stores
+all file/image metadata in memory and in etcd. So it's fine for hundreds or thousands
+of large files/images, but not for millions.
+
+Pseudo-FS proxy is intended for environments where other block volume access methods
+can't be used or impose additional restrictions - for example, VMWare. NFS is better
+for VMWare than, for example, iSCSI, because with iSCSI, VMWare puts all VM images
+into one large shared block image in its own VMFS file system, and with NFS, VMWare
+doesn't use VMFS and puts each VM disk in a regular file which is equal to one
+Vitastor block image, just as originally intended.
+
+To use Vitastor pseudo-FS locally, run `vitastor-nfs mount --block /mnt/vita`.
+
+Also you can start the network server:
 
 ```
-vitastor-nfs [STANDARD OPTIONS] [OTHER OPTIONS]
-
---subdir <DIR>    export images prefixed <DIR>/ (default empty - export all images)
---portmap 0       do not listen on port 111 (portmap/rpcbind, requires root)
---bind <IP>       bind service to <IP> address (default 0.0.0.0)
---nfspath <PATH>  set NFS export path to <PATH> (default is /)
---port <PORT>     use port <PORT> for NFS services (default is 2049)
---pool <POOL>     use <POOL> as default pool for new files (images)
---foreground 1    stay in foreground, do not daemonize
+vitastor-nfs start --block --etcd_address 192.168.5.10:2379 --portmap 0 --port 2050 --pool testpool
 ```
 
-Example start and mount commands (etcd_address is optional):
+To mount the FS exported by this server, run:
 
 ```
-vitastor-nfs --etcd_address 192.168.5.10:2379 --portmap 0 --port 2050 --pool testpool
+mount server:/ /mnt/ -o port=2050,mountport=2050,nfsvers=3,soft,nolock,tcp
 ```
 
-```
-mount localhost:/ /mnt/ -o port=2050,mountport=2050,nfsvers=3,soft,nolock,tcp
-```
+## VitastorFS
+
+VitastorFS is a full-featured clustered (Read-Write-Many) file system. It supports most POSIX
+features like hierarchical organization, symbolic links, hard links, quick renames and so on.
+
+VitastorFS metadata is stored in a Parallel Optimistic B-Tree key-value database,
+implemented over a regular Vitastor block volume. Directory entries and inodes
+are stored in a simple human-readable JSON format in the B-Tree. `vitastor-kv` tool
+can be used to inspect the database.
+
+To use VitastorFS:
+
+1. Create a pool or choose an existing empty pool for FS data
+2. Create an image for FS metadata, preferably in a faster (SSD or replica-HDD) pool,
+   but you can create it in the data pool too if you want (image size doesn't matter):
+   `vitastor-cli create -s 10G -p fastpool testfs`
+3. Mark data pool as an FS pool: `vitastor-cli modify-pool --used-for-fs testfs data-pool`
+4. Either mount the FS: `vitastor-nfs mount --fs testfs --pool data-pool /mnt/vita`
+5. Or start the NFS server: `vitastor-nfs start --fs testfs --pool data-pool`
+
+### Supported POSIX features
+
+- Read-after-write semantics (read returns new data immediately after write)
+- Linear and random read and write
+- Writing outside current file size
+- Hierarchical structure, immediate rename of files and directories
+- File size change support (truncate)
+- Permissions (chmod/chown)
+- Flushing data to stable storage (if required) (fsync)
+- Symbolic links
+- Hard links
+- Special files (devices, sockets, named pipes)
+- File modification and attribute change time tracking (mtime and ctime)
+- Modification time (mtime) and last access time (atime) change support (utimes)
+- Correct handling of directory listing during file creation/deletion
+
+### Limitations
+
+POSIX features currently not implemented in VitastorFS:
+- File locking is not supported
+- Actually used space is not counted, so `du` always reports apparent file sizes
+  instead of actually allocated space
+- Access times (`atime`) are not tracked (like `-o noatime`)
+- Modification time (`mtime`) is updated lazily every second (like `-o lazytime`)
+
+Other notable missing features which should be addressed in the future:
+- Defragmentation of "shared" inodes. Files smaller than pool object size (block_size
+  multiplied by data part count if pool is EC) are internally stored in large block
+  volumes sequentially, one after another, and leave garbage after deleting or resizing.
+  Defragmentator will be implemented to collect this garbage.
+- Inode ID reuse. Currently inode IDs always grow, the limit is 2^48 inodes, so
+  in theory you may hit it if you create and delete a very large number of files
+- Compaction of the key-value B-Tree. Current implementation never merges or deletes
+  B-Tree blocks, so B-Tree may become bloated over time. Currently you can
+  use `vitastor-kv dumpjson` & `loadjson` commands to recreate the index in such
+  situations.
+- Filesystem check tool. VitastorFS doesn't have journal because it would impose a
+  severe performance hit, optimistic CAS-based transactions are used instead of it.
+  So, again, in theory an abnormal shutdown of the FS server may leave some garbage
+  in the DB. The FS is implemented is such way that this garbage doesn't affect its
+  function, but having a tool to clean it up still seems a right thing to do.
+
+## Horizontal scaling
+
+Linux NFS 3.0 client doesn't support built-in scaling or failover, i.e. you can't
+specify multiple server addresses when mounting the FS.
+
+However, you can use any regular TCP load balancing over multiple NFS servers.
+It's absolutely safe with `immediate_commit=all` and `client_enable_writeback=false`
+settings, because Vitastor NFS proxy doesn't keep uncommitted data in memory
+with these settings. But it may even work without `immediate_commit=all` because
+the Linux NFS client repeats all uncommitted writes if it loses the connection.
+
+## Commands
+
+### mount
+
+`vitastor-nfs (--fs <NAME> | --block) [-o <OPT>] mount <MOUNTPOINT>`
+
+Start local filesystem server and mount file system to <MOUNTPOINT>.
+
+Use regular `umount <MOUNTPOINT>` to unmount the FS.
+
+The server will be automatically stopped when the FS is unmounted.
+
+- `-o|--options <OPT>` - Pass additional NFS mount options (ex.: -o async).
+
+### start
+
+`vitastor-nfs (--fs <NAME> | --block) start`
+
+Start network NFS server. Options:
+
+| <!-- -->        | <!-- -->                                                   |
+|-----------------|------------------------------------------------------------|
+| `--bind <IP>`   | bind service to \<IP> address (default 0.0.0.0)            |
+| `--port <PORT>` | use port \<PORT> for NFS services (default is 2049)        |
+| `--portmap 0`   | do not listen on port 111 (portmap/rpcbind, requires root) |
+
+## Common options
+
+| <!-- -->           | <!-- -->                                                 |
+|--------------------|----------------------------------------------------------|
+| `--fs <NAME>`      | use VitastorFS with metadata in image \<NAME>            |
+| `--block`          | use pseudo-FS presenting images as files                 |
+| `--pool <POOL>`    | use \<POOL> as default pool for new files                |
+| `--subdir <DIR>`   | export \<DIR> instead of root directory (pseudo-FS only) |
+| `--nfspath <PATH>` | set NFS export path to \<PATH> (default is /)            |
+| `--pidfile <FILE>` | write process ID to the specified file                   |
+| `--logfile <FILE>` | log to the specified file                                |
+| `--foreground 1`   | stay in foreground, do not daemonize                     |

docs/usage/nfs.ru.md

@@ -1,44 +1,159 @@
-[Документация](../../README-ru.md#документация) → Использование → NFS
+[Документация](../../README-ru.md#документация) → Использование → VitastorFS и псевдо-ФС
 
 -----
 
 [Read in English](nfs.en.md)
 
-# NFS
+# VitastorFS и псевдо-ФС
 
-В Vitastor реализована упрощённая NFS 3.0 прокси для эмуляции файлового доступа к образам.
-Это не полноценная файловая система, т.к. метаданные всех файлов (образов) сохраняются
-в etcd и всё время хранятся в оперативной памяти - то есть, положить туда много файлов
-не получится.
+В Vitastor есть две реализации файловой системы. Обе используются через `vitastor-nfs`.
 
-Однако в качестве способа доступа к образам виртуальных машин NFS прокси прекрасно подходит
-и позволяет подключить Vitastor, например, к VMWare.
+Команды:
+- [mount](#mount)
+- [start](#start)
 
-При этом, если вы используете режим immediate_commit=all (для SSD с конденсаторами или HDD
-с отключённым кэшем), то NFS-сервер не имеет состояния и вы можете свободно поднять
-его в нескольких экземплярах и использовать поверх них сетевой балансировщик нагрузки или
-схему с отказоустойчивостью.
+## Псевдо-ФС
 
-Использование vitastor-nfs:
+Упрощённая реализация псевдо-ФС используется для эмуляции файлового доступа к блочным
+образам Vitastor. Это не полноценная файловая система - в ней отсутствуют многие функции
+POSIX ФС, а метаданные всех файлов (образов) сохраняются в etcd и всё время хранятся в
+оперативной памяти - то есть, псевдо-ФС подходит для сотен или тысяч файлов, но не миллионов.
+
+Псевдо-ФС предназначена для доступа к образам виртуальных машин в средах, где другие
+способы невозможны или неудобны - например, в VMWare. Для VMWare это лучшая опция, чем
+iSCSI, так как при использовании iSCSI VMWare размещает все виртуальные машины в одном
+большом блочном образе внутри собственной ФС VMFS, а с NFS VMFS не используется и каждый
+диск ВМ представляется в виде одного файла, то есть, соответствует одному блочному образу
+Vitastor, как это и задумано изначально.
+
+Чтобы подключить псевдо-ФС Vitastor, выполните команду `vitastor-nfs mount --block /mnt/vita`.
+
+Либо же запустите сетевой вариант сервера:
 
 ```
-vitastor-nfs [СТАНДАРТНЫЕ ОПЦИИ] [ДРУГИЕ ОПЦИИ]
-
---subdir <DIR>    экспортировать "поддиректорию" - образы с префиксом имени <DIR>/ (по умолчанию пусто - экспортировать все образы)
---portmap 0       отключить сервис portmap/rpcbind на порту 111 (по умолчанию включён и требует root привилегий)
---bind <IP>       принимать соединения по адресу <IP> (по умолчанию 0.0.0.0 - на всех)
---nfspath <PATH>  установить путь NFS-экспорта в <PATH> (по умолчанию /)
---port <PORT>     использовать порт <PORT> для NFS-сервисов (по умолчанию 2049)
---pool <POOL>     использовать пул <POOL> для новых образов (обязательно, если пул в кластере не один)
---foreground 1    не уходить в фон после запуска
+vitastor-nfs start --block --etcd_address 192.168.5.10:2379 --portmap 0 --port 2050 --pool testpool
 ```
 
-Пример монтирования Vitastor через NFS (etcd_address необязателен):
+Примонтировать ФС, запущенную с такими опциями, можно следующей командой:
 
 ```
-vitastor-nfs --etcd_address 192.168.5.10:2379 --portmap 0 --port 2050 --pool testpool
+mount server:/ /mnt/ -o port=2050,mountport=2050,nfsvers=3,soft,nolock,tcp
 ```
 
-```
-mount localhost:/ /mnt/ -o port=2050,mountport=2050,nfsvers=3,soft,nolock,tcp
-```
+## VitastorFS
+
+VitastorFS - полноценная кластерная (Read-Write-Many) файловая система. Она поддерживает
+большую часть функций POSIX - иерархическую организацию, символические ссылки, жёсткие
+ссылки, быстрые переименования и так далее.
+
+Метаданные VitastorFS хранятся в собственной реализации БД формата ключ-значения,
+основанной на Параллельном Оптимистичном Б-дереве поверх обычного блочного образа Vitastor.
+И записи каталогов, и иноды, как обычно в Vitastor, хранятся в простом человекочитаемом
+JSON-формате :-). Для инспекции содержимого БД можно использовать инструмент `vitastor-kv`.
+
+Чтобы использовать VitastorFS:
+
+1. Создайте пул для данных ФС или выберите существующий пустой пул
+2. Создайте блочный образ для метаданных ФС, желательно, в более быстром пуле (на SSD
+   или по крайней мере на HDD, но без EC), но можно и в том же пуле, что данные
+   (размер образа значения не имеет):
+   `vitastor-cli create -s 10G -p fastpool testfs`
+3. Пометьте пул данных как ФС-пул: `vitastor-cli modify-pool --used-for-fs testfs data-pool`
+4. Либо примонтируйте ФС: `vitastor-nfs mount --fs testfs --pool data-pool /mnt/vita`
+5. Либо запустите сетевой NFS-сервер: `vitastor-nfs start --fs testfs --pool data-pool`
+
+### Поддерживаемые функции POSIX
+
+- Чтение актуальной версии данных сразу после записи
+- Последовательное и произвольное чтение и запись
+- Запись за пределами текущего размера файла
+- Иерархическая организация, мгновенное переименование файлов и каталогов
+- Изменение размера файла (truncate)
+- Права на файлы (chmod/chown)
+- Фиксация данных на диски (когда необходимо) (fsync)
+- Символические ссылки
+- Жёсткие ссылки
+- Специальные файлы (устройства, сокеты, каналы)
+- Отслеживание времён модификации (mtime), изменения атрибутов (ctime)
+- Ручное изменение времён модификации (mtime), последнего доступа (atime)
+- Корректная обработка изменений списка файлов во время листинга
+
+### Ограничения
+
+Отсутствующие на данный момент в VitastorFS функции POSIX:
+- Блокировки файлов не поддерживаются
+- Фактически занятое файлами место не подсчитывается и не возвращается вызовами
+  stat(2), так что `du` всегда показывает сумму размеров файлов, а не фактически занятое место
+- Времена доступа (`atime`) не отслеживаются (как будто ФС смонтирована с `-o noatime`)
+- Времена модификации (`mtime`) отслеживаются асинхронно (как будто ФС смонтирована с `-o lazytime`)
+
+Другие недостающие функции, которые нужно добавить в будущем:
+- Дефрагментация "общих инодов". На уровне реализации ФС файлы, меньшие, чем размер
+  объекта пула (block_size умножить на число частей данных, если пул EC),
+  упаковываются друг за другом в большие "общие" иноды/тома. Если такие файлы удалять
+  или увеличивать, они перемещаются и оставляют за собой "мусор", вот тут-то и нужен
+  дефрагментатор.
+- Переиспользование номеров инодов. В текущей реализации номера инодов всё время
+  увеличиваются, так что в теории вы можете упереться в лимит, если насоздаёте
+  и наудаляете больше, чем 2^48 файлов.
+- Очистка места в Б-дереве метаданных. Текущая реализация никогда не сливает и не
+  удаляет блоки Б-дерева, так что в теории дерево может разростись и стать неоптимальным.
+  Если вы столкнётесь с такой ситуацией сейчас, вы можете решить её с помощью
+  команд `vitastor-kv dumpjson` и `loadjson` (т.е. пересоздав и загрузив обратно все метаданные ФС).
+- Инструмент проверки метаданных файловой системы. У VitastorFS нет журнала, так как
+  журнал бы сильно замедлил реализацию, вместо него используются оптимистичные
+  транзакции на основе CAS (сравнить-и-записать), и теоретически при нештатном
+  завершении сервера ФС в БД также могут оставаться неконсистентные "мусорные"
+  записи. ФС устроена так, что на работу они не влияют, но для порядка и их стоит
+  уметь подчищать.
+
+## Горизонтальное масштабирование
+
+Клиент Linux NFS 3.0 не поддерживает встроенное масштабирование или отказоустойчивость.
+То есть, вы не можете задать несколько адресов серверов при монтировании ФС.
+
+Однако вы можете использовать любые стандартные сетевые балансировщики нагрузки
+или схемы с отказоустойчивостью. Это точно безопасно при настройках `immediate_commit=all` и
+`client_enable_writeback=false`, так как с ними NFS-сервер Vitastor вообще не хранит
+в памяти ещё не зафиксированные на дисках данные; и вполне вероятно безопасно
+даже без `immediate_commit=all`, потому что NFS-клиент ядра Linux повторяет все
+незафиксированные запросы при потере соединения.
+
+## Команды
+
+### mount
+
+`vitastor-nfs (--fs <NAME> | --block) mount [-o <OPT>] <MOUNTPOINT>`
+
+Запустить локальный сервер и примонтировать ФС в директорию <MOUNTPOINT>.
+
+Чтобы отмонтировать ФС, используйте обычную команду `umount <MOUNTPOINT>`.
+
+Сервер автоматически останавливается при отмонтировании ФС.
+
+- `-o|--options <OPT>` - Передать дополнительные опции монтирования NFS (пример: -o async).
+
+### start
+
+`vitastor-nfs (--fs <NAME> | --block) start`
+
+Запустить сетевой NFS-сервер. Опции:
+
+| <!-- -->        | <!-- -->                                                              |
+|-----------------|-----------------------------------------------------------------------|
+| `--bind <IP>`   | принимать соединения по адресу \<IP> (по умолчанию 0.0.0.0 - на всех) |
+| `--port <PORT>` | использовать порт \<PORT> для NFS-сервисов (по умолчанию 2049)        |
+| `--portmap 0`   | отключить сервис portmap/rpcbind на порту 111 (по умолчанию включён и требует root привилегий) |
+
+## Общие опции
+
+| <!-- -->           | <!-- -->                                                |
+|--------------------|---------------------------------------------------------|
+| `--fs <NAME>`      | использовать VitastorFS с метаданными в образе \<NAME>  |
+| `--block`          | использовать псевдо-ФС для доступа к блочным образам    |
+| `--pool <POOL>`    | использовать пул \<POOL> для новых файлов (обязательно, если пул в кластере не один) |
+| `--subdir <DIR>`   | экспортировать подкаталог \<DIR>, а не корень (только для псевдо-ФС) |
+| `--nfspath <PATH>` | установить путь NFS-экспорта в \<PATH> (по умолчанию /) |
+| `--pidfile <FILE>` | записать ID процесса в заданный файл                    |
+| `--logfile <FILE>` | записывать логи в заданный файл                         |
+| `--foreground 1`   | не уходить в фон после запуска                          |

docs/usage/pg_states.dot

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+    stopping -> offline;
+    starting -> incomplete -> offline;
+    active -> repeering -> peering -> active -> stopping;
+    offline [fillcolor="#A00000"];
+    incomplete [fillcolor="#A00000"];
+    active [fillcolor="#00A000"];
+}

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mon/dsl_pgs.js

@@ -0,0 +1,408 @@
+const { select_murmur3 } = require('./murmur3.js');
+
+const NO_OSD = 'Z';
+
+class RuleCombinator
+{
+    constructor(osd_tree, rules, max_combinations, ordered)
+    {
+        this.osd_tree = index_tree(Object.values(osd_tree).filter(o => o.id));
+        this.rules = rules;
+        this.max_combinations = max_combinations;
+        this.ordered = ordered;
+    }
+
+    random_combinations()
+    {
+        return random_custom_combinations(this.osd_tree, this.rules, this.max_combinations, this.ordered);
+    }
+
+    check_combinations(pgs)
+    {
+        return check_custom_combinations(this.osd_tree, this.rules, pgs);
+    }
+}
+
+// Convert alternative "level-index" format to rules
+// level_index = { [level: string]: string | string[] }
+// level_sequence = optional, levels from upper to lower, i.e. [ 'dc', 'host' ]
+// Example: level_index = { dc: "112233", host: "ABCDEF" }
+function parse_level_indexes(level_index, level_sequence)
+{
+    const rules = [];
+    const lvl_first = {};
+    for (const level in level_index)
+    {
+        const idx = level_index[level];
+        while (rules.length < idx.length)
+        {
+            rules.push([]);
+        }
+        const seen = {};
+        for (let i = 0; i < idx.length; i++)
+        {
+            if (!seen[idx[i]])
+            {
+                const other = Object.values(seen);
+                if (other.length)
+                {
+                    rules[i].push([ level, '!=', other ]);
+                }
+                seen[idx[i]] = i+1;
+            }
+            else
+            {
+                rules[i].push([ level, '=', seen[idx[i]] ]);
+            }
+        }
+        lvl_first[level] = seen;
+    }
+    if (level_sequence)
+    {
+        // Prune useless rules for the sake of prettiness
+        // For simplicity, call "upper" level DC and "lower" level host
+        const level_prio = Object.keys(level_sequence).reduce((a, c) => { a[level_sequence[c]] = c; return a; }, {});
+        for (let upper_i = 0; upper_i < level_sequence.length-1; upper_i++)
+        {
+            const upper_level = level_sequence[upper_i];
+            for (let i = 0; i < rules.length; i++)
+            {
+                const noteq = {};
+                for (let k = 0; k < level_index[upper_level].length; k++)
+                {
+                    // If upper_level[x] is different from upper_level[y]
+                    // then lower_level[x] is also different from lower_level[y]
+                    if (level_index[upper_level][k] != level_index[upper_level][i])
+                    {
+                        noteq[k+1] = true;
+                    }
+                }
+                for (let j = 0; j < rules[i].length; j++)
+                {
+                    if (level_prio[rules[i][j][0]] != null && level_prio[rules[i][j][0]] > upper_i && rules[i][j][1] == '!=')
+                    {
+                        rules[i][j][2] = rules[i][j][2].filter(other_host => !noteq[other_host]);
+                        if (!rules[i][j][2].length)
+                        {
+                            rules[i].splice(j--, 1);
+                        }
+                    }
+                }
+            }
+        }
+    }
+    return rules;
+}
+
+// Parse rules in DSL format
+// dsl := item | item ("\n" | ",") items
+// item := "any" | rules
+// rules := rule | rule rules
+// rule := level operator arg
+// level := /\w+/
+// operator := "!=" | "=" | ">" | "?="
+// arg := value | "(" values ")"
+// values := value | value "," values
+// value := item_ref | constant_id
+// item_ref := /\d+/
+// constant_id := /"([^"]+)"/
+//
+// Output: [ level, operator, value ][][]
+function parse_pg_dsl(text)
+{
+    const tokens = [ ...text.matchAll(/\w+|!=|\?=|[>=\(\),\n]|"([^\"]+)"/g) ].map(t => [ t[0], t.index ]);
+    let positions = [ [] ];
+    let rules = positions[0];
+    for (let i = 0; i < tokens.length; )
+    {
+        if (tokens[i][0] === '\n' || tokens[i][0] === ',')
+        {
+            rules = [];
+            positions.push(rules);
+            i++;
+        }
+        else if (!rules.length && tokens[i][0] === 'any' && (i == tokens.length-1 || tokens[i+1][0] === ',' || tokens[i+1][0] === '\n'))
+        {
+            i++;
+        }
+        else
+        {
+            if (!/^\w/.exec(tokens[i][0]))
+            {
+                throw new Error('Unexpected '+tokens[i][0]+' at '+tokens[i][1]+' (level name expected)');
+            }
+            if (i > tokens.length-3)
+            {
+                throw new Error('Unexpected EOF (operator and value expected)');
+            }
+            if (/^\w/.exec(tokens[i+1][0]) || tokens[i+1][0] === ',' || tokens[i+1][0] === '\n')
+            {
+                throw new Error('Unexpected '+tokens[i+1][0]+' at '+tokens[i+1][1]+' (operator expected)');
+            }
+            if (!/^[\w"(]/.exec(tokens[i+2][0])) // "
+            {
+                throw new Error('Unexpected '+tokens[i+2][0]+' at '+tokens[i+2][1]+' (id, round brace, number or node ID expected)');
+            }
+            let rule = [ tokens[i][0], tokens[i+1][0], tokens[i+2][0] ];
+            i += 3;
+            if (rule[2][0] == '"')
+            {
+                rule[2] = { id: rule[2].substr(1, rule[2].length-2) };
+            }
+            else if (rule[2] === '(')
+            {
+                rule[2] = [];
+                while (true)
+                {
+                    if (i > tokens.length-1)
+                    {
+                        throw new Error('Unexpected EOF (expected list and a closing round brace)');
+                    }
+                    if (tokens[i][0] === ',')
+                    {
+                        i++;
+                    }
+                    else if (tokens[i][0] === ')')
+                    {
+                        i++;
+                        break;
+                    }
+                    else if (tokens[i][0][0] === '"')
+                    {
+                        rule[2].push({ id: tokens[i][0].substr(1, tokens[i][0].length-2) });
+                        i++;
+                    }
+                    else if (/^\d+$/.exec(tokens[i][0]))
+                    {
+                        const n = 0|tokens[i][0];
+                        if (!n)
+                        {
+                            throw new Error('Level reference cannot be 0 (refs count from 1) at '+tokens[i][1]);
+                        }
+                        else if (n > positions.length)
+                        {
+                            throw new Error('Forward references are forbidden at '+tokens[i][1]);
+                        }
+                        rule[2].push(n);
+                        i++;
+                    }
+                    else if (!/^\w/.exec(tokens[i][0]))
+                    {
+                        throw new Error('Unexpected '+tokens[i][0]+' at '+tokens[i][1]+' (number or node ID expected)');
+                    }
+                    else
+                    {
+                        rule[2].push({ id: tokens[i][0] });
+                        i++;
+                    }
+                }
+            }
+            else if (!/^\d+$/.exec(rule[2]))
+            {
+                rule[2] = { id: rule[2] };
+            }
+            else
+            {
+                rule[2] = 0|rule[2];
+                if (!rule[2])
+                {
+                    throw new Error('Level reference cannot be 0 (refs count from 1) at '+tokens[i-1][1]);
+                }
+                else if (rule[2] > positions.length)
+                {
+                    throw new Error('Forward references are forbidden at '+tokens[i-1][1]);
+                }
+            }
+            rules.push(rule);
+        }
+    }
+    return positions;
+}
+
+// osd_tree = index_tree() output
+// levels = { string: number }
+// rules = [ level, operator, value ][][]
+//   level = string
+//   operator = '=' | '!=' | '>' | '?='
+//   value = number|number[] | { id: string|string[] }
+// examples:
+// 1) simple 3 replicas with failure_domain=host:
+//    [ [], [ [ 'host', '!=', 1 ] ], [ [ 'host', '!=', [ 1, 2 ] ] ] ]
+//    in DSL form: any, host!=1, host!=(1,2)
+// 2) EC 4+2 in 3 DC:
+//    [ [], [ [ 'dc', '=', 1 ], [ 'host', '!=', 1 ] ],
+//      [ 'dc', '!=', 1 ], [ [ 'dc', '=', 3 ], [ 'host', '!=', 3 ] ],
+//      [ 'dc', '!=', [ 1, 3 ] ], [ [ 'dc', '=', 5 ], [ 'host', '!=', 5 ] ] ]
+//    in DSL form: any, dc=1 host!=1, dc!=1, dc=3 host!=3, dc!=(1,3), dc=5 host!=5
+// 3) 1 replica in fixed DC + 2 in random DCs:
+//    [ [ [ 'dc', '=', { id: 'meow' } ] ], [ [ 'dc', '!=', 1 ] ], [ [ 'dc', '!=', [ 1, 2 ] ] ] ]
+//    in DSL form: dc=meow, dc!=1, dc!=(1,2)
+// 4) 2 replicas in each DC (almost the same as (2)):
+//    DSL: any, dc=1 host!=1, dc!=1, dc=3 host!=3
+// Alternative simpler way to specify rules would be: [ DC: 112233 HOST: 123456 ]
+function random_custom_combinations(osd_tree, rules, count, ordered)
+{
+    const r = {};
+    const first = filter_tree_by_rules(osd_tree, rules[0], []);
+    let max_size = 0;
+    // All combinations for the first item (usually "any") to try to include each OSD at least once
+    for (const f of first)
+    {
+        const selected = [ f ];
+        for (let i = 1; i < rules.length; i++)
+        {
+            const filtered = filter_tree_by_rules(osd_tree, rules[i], selected);
+            const idx = select_murmur3(filtered.length, i => 'p:'+f.id+':'+filtered[i].id);
+            selected.push(idx == null ? { levels: {}, id: null } : filtered[idx]);
+        }
+        const size = selected.filter(s => s.id !== null).length;
+        max_size = max_size < size ? size : max_size;
+        const pg = selected.map(s => s.id === null ? NO_OSD : s.id);
+        if (!ordered)
+            pg.sort();
+        r['pg_'+pg.join('_')] = pg;
+    }
+    // Pseudo-random selection
+    for (let n = 0; n < count; n++)
+    {
+        const selected = [];
+        for (const item_rules of rules)
+        {
+            const filtered = selected.length ? filter_tree_by_rules(osd_tree, item_rules, selected) : first;
+            const idx = select_murmur3(filtered.length, i => n+':'+filtered[i].id);
+            selected.push(idx == null ? { levels: {}, id: null } : filtered[idx]);
+        }
+        const size = selected.filter(s => s.id !== null).length;
+        max_size = max_size < size ? size : max_size;
+        const pg = selected.map(s => s.id === null ? NO_OSD : s.id);
+        if (!ordered)
+            pg.sort();
+        r['pg_'+pg.join('_')] = pg;
+    }
+    // Exclude PGs with less successful selections than maximum
+    for (const k in r)
+    {
+        if (r[k].filter(s => s !== NO_OSD).length < max_size)
+        {
+            delete r[k];
+        }
+    }
+    return r;
+}
+
+function filter_tree_by_rules(osd_tree, rules, selected)
+{
+    let cur = osd_tree[''].children;
+    for (const rule of rules)
+    {
+        const val = (rule[2] instanceof Array ? rule[2] : [ rule[2] ])
+            .map(v => v instanceof Object ? v.id : selected[v-1].levels[rule[0]]);
+        let preferred = [], other = [];
+        for (let i = 0; i < cur.length; i++)
+        {
+            const item = cur[i];
+            const level_id = item.levels[rule[0]];
+            if (level_id)
+            {
+                if (rule[1] == '>' && val.filter(v => level_id <= v).length == 0 ||
+                    (rule[1] == '=' || rule[1] == '?=') && val.filter(v => level_id != v).length == 0 ||
+                    rule[1] == '!=' && val.filter(v => level_id == v).length == 0)
+                {
+                    // Include
+                    preferred.push(item);
+                }
+                else if (rule[1] == '?=' && val.filter(v => level_id != v).length > 0)
+                {
+                    // Non-preferred
+                    other.push(item);
+                }
+            }
+            else if (item.children)
+            {
+                // Descend
+                cur.splice(i+1, 0, ...item.children);
+            }
+        }
+        cur = preferred.length ? preferred : other;
+    }
+    // Get leaf items
+    for (let i = 0; i < cur.length; i++)
+    {
+        if (cur[i].children)
+        {
+            // Descend
+            cur.splice(i, 1, ...cur[i].children);
+            i--;
+        }
+    }
+    return cur;
+}
+
+// Convert from
+// node_list = { id: string|number, level: string, size?: number, parent?: string|number }[]
+// to
+// node_tree = { [node_id]: { id, level, size?, parent?, children?: child_node_id[], levels: { [level]: id, ... } } }
+function index_tree(node_list)
+{
+    const tree = { '': { children: [], levels: {} } };
+    for (const node of node_list)
+    {
+        tree[node.id] = { ...node, levels: {} };
+        delete tree[node.id].children;
+    }
+    for (const node of node_list)
+    {
+        const parent_id = node.parent && tree[node.parent] ? node.parent : '';
+        tree[parent_id].children = tree[parent_id].children || [];
+        tree[parent_id].children.push(tree[node.id]);
+    }
+    const cur = tree[''].children;
+    for (let i = 0; i < cur.length; i++)
+    {
+        cur[i].levels[cur[i].level] = cur[i].id;
+        if (cur[i].children)
+        {
+            for (const child of cur[i].children)
+            {
+                child.levels = { ...cur[i].levels, ...child.levels };
+            }
+            cur.splice(i, 1, ...cur[i].children);
+            i--;
+        }
+    }
+    return tree;
+}
+
+// selection = id[]
+// osd_tree = index_tree output
+// rules = parse_pg_dsl output
+function check_custom_combinations(osd_tree, rules, pgs)
+{
+    const res = [];
+    skip_pg: for (const pg of pgs)
+    {
+        let selected = pg.map(id => osd_tree[id] || null);
+        for (let i = 0; i < rules.length; i++)
+        {
+            const filtered = filter_tree_by_rules(osd_tree, rules[i], selected);
+            if (selected[i] === null && filtered.length ||
+                !filtered.filter(ok => selected[i].id === ok.id).length)
+            {
+                continue skip_pg;
+            }
+        }
+        res.push(pg);
+    }
+    return res;
+}
+
+module.exports = {
+    RuleCombinator,
+    NO_OSD,
+
+    index_tree,
+    parse_level_indexes,
+    parse_pg_dsl,
+    random_custom_combinations,
+    check_custom_combinations,
+};

mon/lp-optimizer.js

@@ -50,15 +50,15 @@ async function lp_solve(text)
     return { score, vars };
 }
 
-async function optimize_initial({ osd_tree, pg_count, pg_size = 3, pg_minsize = 2, max_combinations = 10000, parity_space = 1, ordered = false })
+// osd_weights = { [id]: weight }
+async function optimize_initial({ osd_weights, combinator, pg_count, pg_size = 3, pg_minsize = 2, parity_space = 1, ordered = false })
 {
-    if (!pg_count || !osd_tree)
+    if (!pg_count || !osd_weights)
     {
         return null;
     }
-    const all_weights = Object.assign({}, ...Object.values(osd_tree));
-    const total_weight = Object.values(all_weights).reduce((a, c) => Number(a) + Number(c), 0);
-    const all_pgs = Object.values(random_combinations(osd_tree, pg_size, max_combinations, parity_space > 1));
+    const total_weight = Object.values(osd_weights).reduce((a, c) => Number(a) + Number(c), 0);
+    const all_pgs = Object.values(make_cyclic(combinator.random_combinations(), parity_space));
     const pg_per_osd = {};
     for (const pg of all_pgs)
     {
@@ -69,15 +69,15 @@ async function optimize_initial({ osd_tree, pg_count, pg_size = 3, pg_minsize =
             pg_per_osd[osd].push((i >= pg_minsize ? parity_space+'*' : '')+"pg_"+pg.join("_"));
         }
     }
-    const pg_effsize = Math.min(pg_minsize, Object.keys(osd_tree).length)
-        + Math.max(0, Math.min(pg_size, Object.keys(osd_tree).length) - pg_minsize) * parity_space;
+    let pg_effsize = all_pgs.reduce((a, c) => Math.max(a, c.filter(e => e != NO_OSD).length), 0);
+    pg_effsize = Math.min(pg_minsize, pg_effsize) + Math.max(0, Math.min(pg_size, pg_effsize) - pg_minsize) * parity_space;
     let lp = '';
     lp += "max: "+all_pgs.map(pg => 'pg_'+pg.join('_')).join(' + ')+";\n";
     for (const osd in pg_per_osd)
     {
         if (osd !== NO_OSD)
         {
-            let osd_pg_count = all_weights[osd]/total_weight*pg_effsize*pg_count;
+            let osd_pg_count = osd_weights[osd]/total_weight*pg_effsize*pg_count;
             lp += pg_per_osd[osd].join(' + ')+' <= '+osd_pg_count+';\n';
         }
     }
@@ -93,7 +93,7 @@ async function optimize_initial({ osd_tree, pg_count, pg_size = 3, pg_minsize =
         throw new Error('Problem is infeasible or unbounded - is it a bug?');
     }
     const int_pgs = make_int_pgs(lp_result.vars, pg_count, ordered);
-    const eff = pg_list_space_efficiency(int_pgs, all_weights, pg_minsize, parity_space);
+    const eff = pg_list_space_efficiency(int_pgs, osd_weights, pg_minsize, parity_space);
     const res = {
         score: lp_result.score,
         weights: lp_result.vars,
@@ -104,6 +104,22 @@ async function optimize_initial({ osd_tree, pg_count, pg_size = 3, pg_minsize =
     return res;
 }
 
+function make_cyclic(pgs, parity_space)
+{
+    if (parity_space > 1)
+    {
+        for (const pg in pgs)
+        {
+            for (let i = 1; i < pg.size; i++)
+            {
+                const cyclic = [ ...pg.slice(i), ...pg.slice(0, i) ];
+                pgs['pg_'+cyclic.join('_')] = cyclic;
+            }
+        }
+    }
+    return pgs;
+}
+
 function shuffle(array)
 {
     for (let i = array.length - 1, j, x; i > 0; i--)
@@ -216,47 +232,17 @@ function calc_intersect_weights(old_pg_size, pg_size, pg_count, prev_weights, al
     return move_weights;
 }
 
-function add_valid_previous(osd_tree, prev_weights, all_pgs)
-{
-    // Add previous combinations that are still valid
-    const hosts = Object.keys(osd_tree).sort();
-    const host_per_osd = {};
-    for (const host in osd_tree)
-    {
-        for (const osd in osd_tree[host])
-        {
-            host_per_osd[osd] = host;
-        }
-    }
-    skip_pg: for (const pg_name in prev_weights)
-    {
-        const seen_hosts = {};
-        const pg = pg_name.substr(3).split(/_/);
-        for (const osd of pg)
-        {
-            if (!host_per_osd[osd] || seen_hosts[host_per_osd[osd]])
-            {
-                continue skip_pg;
-            }
-            seen_hosts[host_per_osd[osd]] = true;
-        }
-        if (!all_pgs[pg_name])
-        {
-            all_pgs[pg_name] = pg;
-        }
-    }
-}
-
 // Try to minimize data movement
-async function optimize_change({ prev_pgs: prev_int_pgs, osd_tree, pg_size = 3, pg_minsize = 2, max_combinations = 10000, parity_space = 1, ordered = false })
+async function optimize_change({ prev_pgs: prev_int_pgs, osd_weights, combinator, pg_size = 3, pg_minsize = 2, parity_space = 1, ordered = false })
 {
-    if (!osd_tree)
+    if (!osd_weights)
     {
         return null;
     }
     // FIXME: use parity_chunks with parity_space instead of pg_minsize
-    const pg_effsize = Math.min(pg_minsize, Object.keys(osd_tree).length)
-        + Math.max(0, Math.min(pg_size, Object.keys(osd_tree).length) - pg_minsize) * parity_space;
+    let all_pgs = make_cyclic(combinator.random_combinations(), parity_space);
+    let pg_effsize = Object.values(all_pgs).reduce((a, c) => Math.max(a, c.filter(e => e != NO_OSD).length), 0);
+    pg_effsize = Math.min(pg_minsize, pg_effsize) + Math.max(0, Math.min(pg_size, pg_effsize) - pg_minsize) * parity_space;
     const pg_count = prev_int_pgs.length;
     const prev_weights = {};
     const prev_pg_per_osd = {};
@@ -273,10 +259,13 @@ async function optimize_change({ prev_pgs: prev_int_pgs, osd_tree, pg_size = 3,
     }
     const old_pg_size = prev_int_pgs[0].length;
     // Get all combinations
-    let all_pgs = random_combinations(osd_tree, pg_size, max_combinations, parity_space > 1);
     if (old_pg_size == pg_size)
     {
-        add_valid_previous(osd_tree, prev_weights, all_pgs);
+        const still_valid = combinator.check_combinations(Object.keys(prev_weights).map(pg_name => pg_name.substr(3).split('_')));
+        for (const pg of still_valid)
+        {
+            all_pgs['pg_'+pg.join('_')] = pg;
+        }
     }
     all_pgs = Object.values(all_pgs);
     const pg_per_osd = {};
@@ -295,8 +284,7 @@ async function optimize_change({ prev_pgs: prev_int_pgs, osd_tree, pg_size = 3,
     // Calculate total weight - old PG weights
     const all_pg_names = all_pgs.map(pg => 'pg_'+pg.join('_'));
     const all_pgs_hash = all_pg_names.reduce((a, c) => { a[c] = true; return a; }, {});
-    const all_weights = Object.assign({}, ...Object.values(osd_tree));
-    const total_weight = Object.values(all_weights).reduce((a, c) => Number(a) + Number(c), 0);
+    const total_weight = Object.values(osd_weights).reduce((a, c) => Number(a) + Number(c), 0);
     // Generate the LP problem
     let lp = '';
     lp += 'max: '+all_pg_names.map(pg_name => (
@@ -311,7 +299,7 @@ async function optimize_change({ prev_pgs: prev_int_pgs, osd_tree, pg_size = 3,
             )).join(' + ');
             const rm_osd_pg_count = (prev_pg_per_osd[osd]||[])
                 .reduce((a, [ old_pg_name, space ]) => (a + (all_pgs_hash[old_pg_name] ? space : 0)), 0);
-            const osd_pg_count = all_weights[osd]*pg_effsize/total_weight*pg_count - rm_osd_pg_count;
+            const osd_pg_count = osd_weights[osd]*pg_effsize/total_weight*pg_count - rm_osd_pg_count;
             lp += osd_sum + ' <= ' + osd_pg_count + ';\n';
         }
     }
@@ -421,7 +409,7 @@ async function optimize_change({ prev_pgs: prev_int_pgs, osd_tree, pg_size = 3,
         int_pgs: new_pgs,
         differs,
         osd_differs,
-        space: pg_effsize * pg_list_space_efficiency(new_pgs, all_weights, pg_minsize, parity_space),
+        space: pg_effsize * pg_list_space_efficiency(new_pgs, osd_weights, pg_minsize, parity_space),
         total_space: total_weight,
     };
 }
@@ -502,198 +490,6 @@ function put_aligned_pgs(aligned_pgs, int_pgs, prev_int_pgs, keygen)
     }
 }
 
-// Convert multi-level osd_tree = { level: number|string, id?: string, size?: number, children?: osd_tree }[]
-// levels = { string: number }
-// to a two-level osd_tree suitable for all_combinations()
-function flatten_tree(osd_tree, levels, failure_domain_level, osd_level, domains = {}, i = { i: 1 })
-{
-    osd_level = levels[osd_level] || osd_level;
-    failure_domain_level = levels[failure_domain_level] || failure_domain_level;
-    for (const node of osd_tree)
-    {
-        if ((levels[node.level] || node.level) < failure_domain_level)
-        {
-            flatten_tree(node.children||[], levels, failure_domain_level, osd_level, domains, i);
-        }
-        else
-        {
-            domains['dom'+(i.i++)] = extract_osds([ node ], levels, osd_level);
-        }
-    }
-    return domains;
-}
-
-function extract_osds(osd_tree, levels, osd_level, osds = {})
-{
-    for (const node of osd_tree)
-    {
-        if ((levels[node.level] || node.level) >= osd_level)
-        {
-            osds[node.id] = node.size;
-        }
-        else
-        {
-            extract_osds(node.children||[], levels, osd_level, osds);
-        }
-    }
-    return osds;
-}
-
-// ordered = don't treat (x,y) and (y,x) as equal
-function random_combinations(osd_tree, pg_size, count, ordered)
-{
-    let seed = 0x5f020e43;
-    let rng = () =>
-    {
-        seed ^= seed << 13;
-        seed ^= seed >> 17;
-        seed ^= seed << 5;
-        return seed + 2147483648;
-    };
-    const osds = Object.keys(osd_tree).reduce((a, c) => { a[c] = Object.keys(osd_tree[c]).sort(); return a; }, {});
-    const hosts = Object.keys(osd_tree).sort().filter(h => osds[h].length > 0);
-    const r = {};
-    // Generate random combinations including each OSD at least once
-    for (let h = 0; h < hosts.length; h++)
-    {
-        for (let o = 0; o < osds[hosts[h]].length; o++)
-        {
-            const pg = [ osds[hosts[h]][o] ];
-            const cur_hosts = [ ...hosts ];
-            cur_hosts.splice(h, 1);
-            for (let i = 1; i < pg_size && i < hosts.length; i++)
-            {
-                const next_host = rng() % cur_hosts.length;
-                const next_osd = rng() % osds[cur_hosts[next_host]].length;
-                pg.push(osds[cur_hosts[next_host]][next_osd]);
-                cur_hosts.splice(next_host, 1);
-            }
-            const cyclic_pgs = [ pg ];
-            if (ordered)
-            {
-                for (let i = 1; i < pg.size; i++)
-                {
-                    cyclic_pgs.push([ ...pg.slice(i), ...pg.slice(0, i) ]);
-                }
-            }
-            for (const pg of cyclic_pgs)
-            {
-                while (pg.length < pg_size)
-                {
-                    pg.push(NO_OSD);
-                }
-                r['pg_'+pg.join('_')] = pg;
-            }
-        }
-    }
-    // Generate purely random combinations
-    while (count > 0)
-    {
-        let host_idx = [];
-        const cur_hosts = [ ...hosts.map((h, i) => i) ];
-        const max_hosts = pg_size < hosts.length ? pg_size : hosts.length;
-        if (ordered)
-        {
-            for (let i = 0; i < max_hosts; i++)
-            {
-                const r = rng() % cur_hosts.length;
-                host_idx[i] = cur_hosts[r];
-                cur_hosts.splice(r, 1);
-            }
-        }
-        else
-        {
-            for (let i = 0; i < max_hosts; i++)
-            {
-                const r = rng() % (cur_hosts.length - (max_hosts - i - 1));
-                host_idx[i] = cur_hosts[r];
-                cur_hosts.splice(0, r+1);
-            }
-        }
-        let pg = host_idx.map(h => osds[hosts[h]][rng() % osds[hosts[h]].length]);
-        while (pg.length < pg_size)
-        {
-            pg.push(NO_OSD);
-        }
-        r['pg_'+pg.join('_')] = pg;
-        count--;
-    }
-    return r;
-}
-
-// Super-stupid algorithm. Given the current OSD tree, generate all possible OSD combinations
-// osd_tree = { failure_domain1: { osd1: size1, ... }, ... }
-// ordered = return combinations without duplicates having different order
-function all_combinations(osd_tree, pg_size, ordered, count)
-{
-    const hosts = Object.keys(osd_tree).sort();
-    const osds = Object.keys(osd_tree).reduce((a, c) => { a[c] = Object.keys(osd_tree[c]).sort(); return a; }, {});
-    while (hosts.length < pg_size)
-    {
-        osds[NO_OSD] = [ NO_OSD ];
-        hosts.push(NO_OSD);
-    }
-    let host_idx = [];
-    let osd_idx = [];
-    for (let i = 0; i < pg_size; i++)
-    {
-        host_idx.push(i);
-        osd_idx.push(0);
-    }
-    const r = [];
-    while (!count || count < 0 || r.length < count)
-    {
-        r.push(host_idx.map((hi, i) => osds[hosts[hi]][osd_idx[i]]));
-        let inc = pg_size-1;
-        while (inc >= 0)
-        {
-            osd_idx[inc]++;
-            if (osd_idx[inc] >= osds[hosts[host_idx[inc]]].length)
-            {
-                osd_idx[inc] = 0;
-                inc--;
-            }
-            else
-            {
-                break;
-            }
-        }
-        if (inc < 0)
-        {
-            // no osds left in the current host combination, select the next one
-            inc = pg_size-1;
-            same_again: while (inc >= 0)
-            {
-                host_idx[inc]++;
-                for (let prev_host = 0; prev_host < inc; prev_host++)
-                {
-                    if (host_idx[prev_host] == host_idx[inc])
-                    {
-                        continue same_again;
-                    }
-                }
-                if (host_idx[inc] < (ordered ? hosts.length-(pg_size-1-inc) : hosts.length))
-                {
-                    while ((++inc) < pg_size)
-                    {
-                        host_idx[inc] = (ordered ? host_idx[inc-1]+1 : 0);
-                    }
-                    break;
-                }
-                else
-                {
-                    inc--;
-                }
-            }
-            if (inc < 0)
-            {
-                break;
-            }
-        }
-    }
-    return r;
-}
-
 function pg_weights_space_efficiency(weights, pg_count, osd_sizes)
 {
     const per_osd = {};
@@ -752,11 +548,8 @@ module.exports = {
     pg_weights_space_efficiency,
     pg_list_space_efficiency,
     pg_per_osd_space_efficiency,
-    flatten_tree,
 
     lp_solve,
     make_int_pgs,
     align_pgs,
-    random_combinations,
-    all_combinations,
 };

mon/mon.js

@@ -6,6 +6,8 @@ const http = require('http');
 const crypto = require('crypto');
 const os = require('os');
 const WebSocket = require('ws');
+const { RuleCombinator, parse_level_indexes, parse_pg_dsl } = require('./dsl_pgs.js');
+const { SimpleCombinator } = require('./simple_pgs.js');
 const LPOptimizer = require('./lp-optimizer.js');
 const stableStringify = require('./stable-stringify.js');
 const PGUtil = require('./PGUtil.js');
@@ -37,7 +39,7 @@ const etcd_allow = new RegExp('^'+[
     'pg/history/[1-9]\\d*/[1-9]\\d*',
     'pool/stats/[1-9]\\d*',
     'history/last_clean_pgs',
-    'inode/stats/[1-9]\\d*/[1-9]\\d*',
+    'inode/stats/[1-9]\\d*/\\d+',
     'pool/stats/[1-9]\\d*',
     'stats',
     'index/image/.*',
@@ -63,6 +65,7 @@ const etcd_tree = {
             mon_stats_timeout: 1000, // ms. min: 100
             osd_out_time: 600, // seconds. min: 0
             placement_levels: { datacenter: 1, rack: 2, host: 3, osd: 4, ... },
+            force_new_pg_combinator: false,
             // client and osd
             tcp_header_buffer_size: 65536,
             use_sync_send_recv: false,
@@ -86,13 +89,14 @@ const etcd_tree = {
             client_max_buffered_bytes: 33554432,
             client_max_buffered_ops: 1024,
             client_max_writeback_iodepth: 256,
+            client_retry_interval: 50, // ms. min: 10
+            client_eio_retry_interval: 1000, // ms
             // client and osd - configurable online
             log_level: 0,
             peer_connect_interval: 5, // seconds. min: 1
             peer_connect_timeout: 5, // seconds. min: 1
             osd_idle_timeout: 5, // seconds. min: 1
             osd_ping_timeout: 5, // seconds. min: 1
-            up_wait_retry_interval: 50, // ms. min: 10
             max_etcd_attempts: 5,
             etcd_quick_timeout: 1000, // ms
             etcd_slow_timeout: 5000, // ms
@@ -184,7 +188,10 @@ const etcd_tree = {
                 // number of parity chunks, required for EC
                 parity_chunks?: 1,
                 pg_count: 100,
-                failure_domain: 'host',
+                // default is failure_domain=host
+                failure_domain?: 'host',
+                level_rules?: { host: '123' },
+                pg_rules?: 'any, dc=1 host!=1, dc=1 host!=(1,2)',
                 max_osd_combinations: 10000,
                 // block_size, bitmap_granularity, immediate_commit must match all OSDs used in that pool
                 block_size: 131072,
@@ -929,7 +936,6 @@ class Mon
             // Parent's level must be less than child's; OSDs must be leaves
             const parent = parent_level && parent_level < node_level ? node_cfg.parent : '';
             tree[parent].children.push(tree[node_id]);
-            delete node_cfg.parent;
         }
         return { up_osds, levels, osd_tree: tree };
     }
@@ -1095,7 +1101,6 @@ class Mon
         pool_cfg.pg_minsize = Math.floor(pool_cfg.pg_minsize);
         pool_cfg.parity_chunks = Math.floor(pool_cfg.parity_chunks) || undefined;
         pool_cfg.pg_count = Math.floor(pool_cfg.pg_count);
-        pool_cfg.failure_domain = pool_cfg.failure_domain || 'host';
         pool_cfg.max_osd_combinations = Math.floor(pool_cfg.max_osd_combinations) || 10000;
         if (!/^[1-9]\d*$/.exec(''+pool_id))
         {
@@ -1175,10 +1180,32 @@ class Mon
                 console.log('Pool '+pool_id+' has invalid primary_affinity_tags (must be a string or array of strings)');
             return false;
         }
+        if (!this.get_pg_rules(pool_id, pool_cfg, true))
+        {
+            return false;
+        }
         return true;
     }
 
-    filter_osds_by_tags(orig_tree, flat_tree, tags)
+    filter_osds_by_root_node(pool_tree, root_node)
+    {
+        if (!root_node)
+        {
+            return;
+        }
+        pool_tree = pool_tree[pool_cfg.root_node];
+        const cur = [ ...(pool_tree||{}).children||[] ];
+        for (let i = 0; i < cur.length; i++)
+        {
+            if (cur.children)
+            {
+                cur.splice(i+1, 1, ...cur.children);
+            }
+        }
+        return cur;
+    }
+
+    filter_osds_by_tags(orig_tree, tags)
     {
         if (!tags)
         {
@@ -1186,30 +1213,22 @@ class Mon
         }
         for (const tag of (tags instanceof Array ? tags : [ tags ]))
         {
-            for (const host in flat_tree)
+            for (const osd in orig_tree)
             {
-                let found = 0;
-                for (const osd in flat_tree[host])
+                if (orig_tree[osd].level === 'osd' &&
+                    (!orig_tree[osd].tags || !orig_tree[osd].tags[tag]))
                 {
-                    if (!orig_tree[osd].tags || !orig_tree[osd].tags[tag])
-                        delete flat_tree[host][osd];
-                    else
-                        found++;
-                }
-                if (!found)
-                {
-                    delete flat_tree[host];
+                    delete orig_tree[osd];
                 }
             }
         }
     }
 
-    filter_osds_by_block_layout(flat_tree, block_size, bitmap_granularity, immediate_commit)
+    filter_osds_by_block_layout(orig_tree, block_size, bitmap_granularity, immediate_commit)
     {
-        for (const host in flat_tree)
+        for (const osd in orig_tree)
         {
-            let found = 0;
-            for (const osd in flat_tree[host])
+            if (orig_tree[osd].level === 'osd')
             {
                 const osd_stat = this.state.osd.stats[osd];
                 if (osd_stat && (osd_stat.bs_block_size && osd_stat.bs_block_size != block_size ||
@@ -1217,16 +1236,8 @@ class Mon
                     osd_stat.immediate_commit == 'small' && immediate_commit == 'all' ||
                     osd_stat.immediate_commit == 'none' && immediate_commit != 'none'))
                 {
-                    delete flat_tree[host][osd];
+                    delete orig_tree[host][osd];
                 }
-                else
-                {
-                    found++;
-                }
-            }
-            if (!found)
-            {
-                delete flat_tree[host];
             }
         }
     }
@@ -1236,12 +1247,60 @@ class Mon
         let aff_osds = up_osds;
         if (pool_cfg.primary_affinity_tags)
         {
-            aff_osds = { ...up_osds };
-            this.filter_osds_by_tags(osd_tree, { x: aff_osds }, pool_cfg.primary_affinity_tags);
+            aff_osds = Object.keys(up_osds).reduce((a, c) => { a[c] = osd_tree[c]; return a; }, {});
+            this.filter_osds_by_tags(aff_osds, pool_cfg.primary_affinity_tags);
+            for (const osd in aff_osds)
+            {
+                aff_osds[osd] = true;
+            }
         }
         return aff_osds;
     }
 
+    get_pg_rules(pool_id, pool_cfg, warn)
+    {
+        if (pool_cfg.level_rules instanceof Object)
+        {
+            const levels = this.config.placement_levels||{};
+            levels.host = levels.host || 100;
+            levels.osd = levels.osd || 101;
+            for (const k in pool_cfg.level_rules)
+            {
+                if (!levels[k] || typeof pool_cfg.level_rules[k] !== 'string' &&
+                    (!pool_cfg.level_rules[k] instanceof Array || pool_cfg.level_rules[k].filter(s => typeof s !== 'string').length > 0))
+                {
+                    if (warn)
+                        console.log('Pool '+pool_id+' configuration is invalid: level_rules should be { [level]: string or array of strings }');
+                    return null;
+                }
+            }
+            return parse_level_indexes(pool_cfg.level_rules);
+        }
+        else if (typeof pool_cfg.pg_rules === 'string')
+        {
+            try
+            {
+                return parse_pg_dsl(pool_cfg.pg_rules);
+            }
+            catch (e)
+            {
+                if (warn)
+                    console.log('Pool '+pool_id+' configuration is invalid: invalid pg_rules: '+e.message);
+            }
+        }
+        else
+        {
+            let rules = [ [] ];
+            let prev = [ 1 ];
+            for (let i = 1; i < pool_cfg.pg_size; i++)
+            {
+                rules.push([ [ pool_cfg.failure_domain||'host', '!=', prev ] ]);
+                prev = [ ...prev, i+1 ];
+            }
+            return rules;
+        }
+    }
+
     async generate_pool_pgs(pool_id, osd_tree, levels)
     {
         const pool_cfg = this.state.config.pools[pool_id];
@@ -1249,10 +1308,9 @@ class Mon
         {
             return null;
         }
-        let pool_tree = osd_tree[pool_cfg.root_node || ''];
-        pool_tree = pool_tree ? pool_tree.children : [];
-        pool_tree = LPOptimizer.flatten_tree(pool_tree, levels, pool_cfg.failure_domain, 'osd');
-        this.filter_osds_by_tags(osd_tree, pool_tree, pool_cfg.osd_tags);
+        let pool_tree = osd_tree;
+        this.filter_osds_by_root_node(pool_tree, pool_cfg.root_node);
+        this.filter_osds_by_tags(pool_tree, pool_cfg.osd_tags);
         this.filter_osds_by_block_layout(
             pool_tree,
             pool_cfg.block_size || this.config.block_size || 131072,
@@ -1275,11 +1333,15 @@ class Mon
         }
         const old_pg_count = prev_pgs.length;
         const optimize_cfg = {
-            osd_tree: pool_tree,
+            osd_weights: Object.values(pool_tree).filter(item => item.level === 'osd').reduce((a, c) => { a[c.id] = c.size; return a; }, {}),
+            combinator: 1 || this.config.force_new_pg_combinator || !pool_cfg.level_rules && !pool_cfg.pg_rules
+                // new algorithm:
+                ? new RuleCombinator(osd_tree, this.get_pg_rules(pool_id, pool_cfg), pool_cfg.max_osd_combinations)
+                // old algorithm:
+                : new SimpleCombinator(flatten_tree(osd_tree, levels, pool_cfg.failure_domain, 'osd'), pool_cfg.pg_size, pool_cfg.max_osd_combinations),
             pg_count: pool_cfg.pg_count,
             pg_size: pool_cfg.pg_size,
             pg_minsize: pool_cfg.pg_minsize,
-            max_combinations: pool_cfg.max_osd_combinations,
             ordered: pool_cfg.scheme != 'replicated',
         };
         let optimize_result;
@@ -1348,8 +1410,8 @@ class Mon
             // Something has changed
             console.log('Pool configuration or OSD tree changed, re-optimizing');
             // First re-optimize PGs, but don't look at history yet
-            const optimize_results = await Promise.all(Object.keys(this.state.config.pools)
-                .map(pool_id => this.generate_pool_pgs(pool_id, osd_tree, levels)));
+            const optimize_results = (await Promise.all(Object.keys(this.state.config.pools)
+                .map(pool_id => this.generate_pool_pgs(pool_id, osd_tree, levels)))).filter(r => r);
             // Then apply the modification in the form of an optimistic transaction,
             // each time considering new pg/history modifications (OSDs modify it during rebalance)
             while (!await this.apply_pool_pgs(optimize_results, up_osds, osd_tree, tree_hash))
@@ -1435,6 +1497,10 @@ class Mon
 
     async apply_pool_pgs(results, up_osds, osd_tree, tree_hash)
     {
+        if (!results.length)
+        {
+            return true;
+        }
         for (const pool_id in (this.state.config.pgs||{}).items||{})
         {
             // We should stop all PGs when deleting a pool or changing its PG count
@@ -1736,8 +1802,11 @@ class Mon
                 for (const inode_num in this.state.osd.space[osd_num][pool_id])
                 {
                     const u = BigInt(this.state.osd.space[osd_num][pool_id][inode_num]||0);
-                    inode_stats[pool_id][inode_num] = inode_stats[pool_id][inode_num] || inode_stub();
-                    inode_stats[pool_id][inode_num].raw_used += u;
+                    if (inode_num)
+                    {
+                        inode_stats[pool_id][inode_num] = inode_stats[pool_id][inode_num] || inode_stub();
+                        inode_stats[pool_id][inode_num].raw_used += u;
+                    }
                     this.state.pool.stats[pool_id].used_raw_tb += u;
                 }
             }

mon/murmur3.js

@@ -0,0 +1,38 @@
+function select_murmur3(count, cb)
+{
+    if (!count)
+    {
+        return null;
+    }
+    else
+    {
+        let i = 0, maxh = -1;
+        for (let j = 0; j < count; j++)
+        {
+            const h = murmur3(cb(j));
+            if (h > maxh)
+            {
+                i = j;
+                maxh = h;
+            }
+        }
+        return i;
+    }
+}
+
+function murmur3(s)
+{
+    let hash = 0x12345678;
+    for (let i = 0; i < s.length; i++)
+    {
+        hash ^= s.charCodeAt(i);
+        hash = (hash*0x5bd1e995) & 0xFFFFFFFF;
+        hash ^= (hash >> 15);
+    }
+    return hash;
+}
+
+module.exports = {
+    murmur3,
+    select_murmur3,
+};

mon/package.json

@@ -1,6 +1,6 @@
 {
   "name": "vitastor-mon",
-  "version": "1.4.7",
+  "version": "1.5.0",
   "description": "Vitastor SDS monitor service",
   "main": "mon-main.js",
   "scripts": {

mon/simple_pgs.js

@@ -0,0 +1,241 @@
+const { select_murmur3 } = require('./murmur3.js');
+
+const NO_OSD = 'Z';
+
+class SimpleCombinator
+{
+    constructor(flat_tree, pg_size, max_combinations, ordered)
+    {
+        this.osd_tree = flat_tree;
+        this.pg_size = pg_size;
+        this.max_combinations = max_combinations;
+        this.ordered = ordered;
+    }
+
+    random_combinations()
+    {
+        return random_combinations(this.osd_tree, this.pg_size, this.max_combinations, this.ordered);
+    }
+
+    check_combinations(pgs)
+    {
+        return check_combinations(this.osd_tree, pgs);
+    }
+}
+
+// Convert multi-level osd_tree = { level: number|string, id?: string, size?: number, children?: osd_tree }[]
+// levels = { string: number }
+// to a two-level osd_tree suitable for all_combinations()
+function flatten_tree(osd_tree, levels, failure_domain_level, osd_level, domains = {}, i = { i: 1 })
+{
+    osd_level = levels[osd_level] || osd_level;
+    failure_domain_level = levels[failure_domain_level] || failure_domain_level;
+    for (const node of osd_tree)
+    {
+        if ((levels[node.level] || node.level) < failure_domain_level)
+        {
+            flatten_tree(node.children||[], levels, failure_domain_level, osd_level, domains, i);
+        }
+        else
+        {
+            domains['dom'+(i.i++)] = extract_osds([ node ], levels, osd_level);
+        }
+    }
+    return domains;
+}
+
+function extract_osds(osd_tree, levels, osd_level, osds = {})
+{
+    for (const node of osd_tree)
+    {
+        if ((levels[node.level] || node.level) >= osd_level)
+        {
+            osds[node.id] = node.size;
+        }
+        else
+        {
+            extract_osds(node.children||[], levels, osd_level, osds);
+        }
+    }
+    return osds;
+}
+
+// ordered = don't treat (x,y) and (y,x) as equal
+function random_combinations(osd_tree, pg_size, count, ordered)
+{
+    const osds = Object.keys(osd_tree).reduce((a, c) => { a[c] = Object.keys(osd_tree[c]).sort(); return a; }, {});
+    const hosts = Object.keys(osd_tree).sort().filter(h => osds[h].length > 0);
+    const r = {};
+    // Generate random combinations including each OSD at least once
+    for (let h = 0; h < hosts.length; h++)
+    {
+        for (let o = 0; o < osds[hosts[h]].length; o++)
+        {
+            const pg = [ osds[hosts[h]][o] ];
+            const cur_hosts = [ ...hosts ];
+            cur_hosts.splice(h, 1);
+            for (let i = 1; i < pg_size && i < hosts.length; i++)
+            {
+                const next_host = select_murmur3(cur_hosts.length, i => pg[0]+':i:'+cur_hosts[i]);
+                const next_osd = select_murmur3(osds[cur_hosts[next_host]].length, i => pg[0]+':i:'+osds[cur_hosts[next_host]][i]);
+                pg.push(osds[cur_hosts[next_host]][next_osd]);
+                cur_hosts.splice(next_host, 1);
+            }
+            while (pg.length < pg_size)
+            {
+                pg.push(NO_OSD);
+            }
+            r['pg_'+pg.join('_')] = pg;
+        }
+    }
+    // Generate purely random combinations
+    while (count > 0)
+    {
+        let host_idx = [];
+        const cur_hosts = [ ...hosts.map((h, i) => i) ];
+        const max_hosts = pg_size < hosts.length ? pg_size : hosts.length;
+        if (ordered)
+        {
+            for (let i = 0; i < max_hosts; i++)
+            {
+                const r = select_murmur3(cur_hosts.length, i => count+':h:'+cur_hosts[i]);
+                host_idx[i] = cur_hosts[r];
+                cur_hosts.splice(r, 1);
+            }
+        }
+        else
+        {
+            for (let i = 0; i < max_hosts; i++)
+            {
+                const r = select_murmur3(cur_hosts.length - (max_hosts - i - 1), i => count+':h:'+cur_hosts[i]);
+                host_idx[i] = cur_hosts[r];
+                cur_hosts.splice(0, r+1);
+            }
+        }
+        let pg = host_idx.map(h => osds[hosts[h]][select_murmur3(osds[hosts[h]].length, i => count+':o:'+osds[hosts[h]][i])]);
+        while (pg.length < pg_size)
+        {
+            pg.push(NO_OSD);
+        }
+        r['pg_'+pg.join('_')] = pg;
+        count--;
+    }
+    return r;
+}
+
+// Super-stupid algorithm. Given the current OSD tree, generate all possible OSD combinations
+// osd_tree = { failure_domain1: { osd1: size1, ... }, ... }
+// ordered = return combinations without duplicates having different order
+function all_combinations(osd_tree, pg_size, ordered, count)
+{
+    const hosts = Object.keys(osd_tree).sort();
+    const osds = Object.keys(osd_tree).reduce((a, c) => { a[c] = Object.keys(osd_tree[c]).sort(); return a; }, {});
+    while (hosts.length < pg_size)
+    {
+        osds[NO_OSD] = [ NO_OSD ];
+        hosts.push(NO_OSD);
+    }
+    let host_idx = [];
+    let osd_idx = [];
+    for (let i = 0; i < pg_size; i++)
+    {
+        host_idx.push(i);
+        osd_idx.push(0);
+    }
+    const r = [];
+    while (!count || count < 0 || r.length < count)
+    {
+        r.push(host_idx.map((hi, i) => osds[hosts[hi]][osd_idx[i]]));
+        let inc = pg_size-1;
+        while (inc >= 0)
+        {
+            osd_idx[inc]++;
+            if (osd_idx[inc] >= osds[hosts[host_idx[inc]]].length)
+            {
+                osd_idx[inc] = 0;
+                inc--;
+            }
+            else
+            {
+                break;
+            }
+        }
+        if (inc < 0)
+        {
+            // no osds left in the current host combination, select the next one
+            inc = pg_size-1;
+            same_again: while (inc >= 0)
+            {
+                host_idx[inc]++;
+                for (let prev_host = 0; prev_host < inc; prev_host++)
+                {
+                    if (host_idx[prev_host] == host_idx[inc])
+                    {
+                        continue same_again;
+                    }
+                }
+                if (host_idx[inc] < (ordered ? hosts.length-(pg_size-1-inc) : hosts.length))
+                {
+                    while ((++inc) < pg_size)
+                    {
+                        host_idx[inc] = (ordered ? host_idx[inc-1]+1 : 0);
+                    }
+                    break;
+                }
+                else
+                {
+                    inc--;
+                }
+            }
+            if (inc < 0)
+            {
+                break;
+            }
+        }
+    }
+    return r;
+}
+
+function check_combinations(osd_tree, pgs)
+{
+    const hosts = Object.keys(osd_tree).sort();
+    const host_per_osd = {};
+    for (const host in osd_tree)
+    {
+        for (const osd in osd_tree[host])
+        {
+            host_per_osd[osd] = host;
+        }
+    }
+    const res = [];
+    skip_pg: for (const pg of pgs)
+    {
+        const seen_hosts = {};
+        for (const osd of pg)
+        {
+            if (!host_per_osd[osd] || seen_hosts[host_per_osd[osd]])
+            {
+                continue skip_pg;
+            }
+            seen_hosts[host_per_osd[osd]] = true;
+        }
+        res.push(pg);
+    }
+    return res;
+}
+
+function compat(params)
+{
+    return {
+        ...params,
+        osd_weights: Object.assign({}, ...Object.values(params.osd_tree)),
+        combinator: new SimpleCombinator(params.osd_tree, params.pg_size, params.max_combinations||10000),
+    };
+}
+
+module.exports = {
+    flatten_tree,
+    SimpleCombinator,
+    compat,
+    NO_OSD,
+};

mon/test-nonuniform.js

@@ -7,6 +7,7 @@
 // This leads to really uneven OSD fill ratio in Ceph even when PGs are perfectly balanced.
 // But we support this case with the "parity_space" parameter in optimize_initial()/optimize_change().
 
+const { SimpleCombinator } = require('./simple_pgs.js');
 const LPOptimizer = require('./lp-optimizer.js');
 
 const osd_tree = {
@@ -114,16 +115,17 @@ Fine, let's try to optimize for it.
 
 async function run()
 {
-    const all_weights = Object.assign({}, ...Object.values(osd_tree));
-    const total_weight = Object.values(all_weights).reduce((a, c) => Number(a) + Number(c), 0);
-    const eff = LPOptimizer.pg_list_space_efficiency(prev_pgs, all_weights, 2, 2.26);
+    const osd_weights = Object.assign({}, ...Object.values(osd_tree));
+    const total_weight = Object.values(osd_weights).reduce((a, c) => Number(a) + Number(c), 0);
+    const eff = LPOptimizer.pg_list_space_efficiency(prev_pgs, osd_weights, 2, 2.26);
     const orig = eff*4.26 / total_weight;
     console.log('Original efficiency was: '+Math.round(orig*10000)/100+' %');
 
-    let prev = await LPOptimizer.optimize_initial({ osd_tree, pg_size: 3, pg_count: 256, parity_space: 2.26 });
+    const combinator = new SimpleCombinator(osd_tree, 3, 10000);
+    let prev = await LPOptimizer.optimize_initial({ osd_weights, combinator, pg_size: 3, pg_count: 256, parity_space: 2.26 });
     LPOptimizer.print_change_stats(prev);
 
-    let next = await LPOptimizer.optimize_change({ prev_pgs, osd_tree, pg_size: 3, max_combinations: 10000, parity_space: 2.26 });
+    let next = await LPOptimizer.optimize_change({ prev_pgs, osd_weights, combinator, pg_size: 3, parity_space: 2.26 });
     LPOptimizer.print_change_stats(next);
 }
 

mon/test-optimize-simple.js

@@ -1,6 +1,7 @@
 // Copyright (c) Vitaliy Filippov, 2019+
 // License: VNPL-1.1 (see README.md for details)
 
+const { compat } = require('./simple_pgs.js');
 const LPOptimizer = require('./lp-optimizer.js');
 
 async function run()
@@ -14,26 +15,26 @@ async function run()
     let res;
 
     console.log('16 PGs, size=3');
-    res = await LPOptimizer.optimize_initial({ osd_tree, pg_size: 3, pg_count: 16, ordered: false });
+    res = await LPOptimizer.optimize_initial(compat({ osd_tree, pg_size: 3, pg_count: 16, ordered: false }));
     LPOptimizer.print_change_stats(res, false);
     assert(res.space == 3, 'Initial distribution');
     console.log('\nChange size to 2');
-    res = await LPOptimizer.optimize_change({ prev_pgs: res.int_pgs, osd_tree, pg_size: 2, ordered: false });
+    res = await LPOptimizer.optimize_change(compat({ prev_pgs: res.int_pgs, osd_tree, pg_size: 2, ordered: false }));
     LPOptimizer.print_change_stats(res, false);
     assert(res.space >= 3*14/16 && res.osd_differs == 0, 'Redistribution');
     console.log('\nRemove OSD 3');
     const no3_tree = { ...osd_tree };
     delete no3_tree['300'];
-    res = await LPOptimizer.optimize_change({ prev_pgs: res.int_pgs, osd_tree: no3_tree, pg_size: 2, ordered: false });
+    res = await LPOptimizer.optimize_change(compat({ prev_pgs: res.int_pgs, osd_tree: no3_tree, pg_size: 2, ordered: false }));
     LPOptimizer.print_change_stats(res, false);
     assert(res.space == 2, 'Redistribution after OSD removal');
 
     console.log('\n16 PGs, size=3, ordered');
-    res = await LPOptimizer.optimize_initial({ osd_tree, pg_size: 3, pg_count: 16, ordered: true });
+    res = await LPOptimizer.optimize_initial(compat({ osd_tree, pg_size: 3, pg_count: 16, ordered: true }));
     LPOptimizer.print_change_stats(res, false);
     assert(res.space == 3, 'Initial distribution');
     console.log('\nChange size to 2, ordered');
-    res = await LPOptimizer.optimize_change({ prev_pgs: res.int_pgs, osd_tree, pg_size: 2, ordered: true });
+    res = await LPOptimizer.optimize_change(compat({ prev_pgs: res.int_pgs, osd_tree, pg_size: 2, ordered: true }));
     LPOptimizer.print_change_stats(res, false);
     assert(res.space >= 3*14/16 && res.osd_differs < 8, 'Redistribution');
 }

mon/test-optimize-undersized.js

@@ -1,6 +1,7 @@
 // Copyright (c) Vitaliy Filippov, 2019+
 // License: VNPL-1.1 (see README.md for details)
 
+const { compat, flatten_tree } = require('./simple_pgs.js');
 const LPOptimizer = require('./lp-optimizer.js');
 
 const crush_tree = [
@@ -36,44 +37,44 @@ const crush_tree = [
     ] },
 ];
 
-const osd_tree = LPOptimizer.flatten_tree(crush_tree, {}, 1, 3);
+const osd_tree = flatten_tree(crush_tree, {}, 1, 3);
 console.log(osd_tree);
 
 async function run()
 {
     const cur_tree = {};
     console.log('Empty tree:');
-    let res = await LPOptimizer.optimize_initial({ osd_tree: cur_tree, pg_size: 3, pg_count: 256 });
+    let res = await LPOptimizer.optimize_initial(compat({ osd_tree: cur_tree, pg_size: 3, pg_count: 256 }));
     LPOptimizer.print_change_stats(res, false);
     assert(res.space == 0);
     console.log('\nAdding 1st failure domain:');
     cur_tree['dom1'] = osd_tree['dom1'];
-    res = await LPOptimizer.optimize_change({ prev_pgs: res.int_pgs, osd_tree: cur_tree, pg_size: 3 });
+    res = await LPOptimizer.optimize_change(compat({ prev_pgs: res.int_pgs, osd_tree: cur_tree, pg_size: 3 }));
     LPOptimizer.print_change_stats(res, false);
     assert(res.space == 12 && res.total_space == 12);
     console.log('\nAdding 2nd failure domain:');
     cur_tree['dom2'] = osd_tree['dom2'];
-    res = await LPOptimizer.optimize_change({ prev_pgs: res.int_pgs, osd_tree: cur_tree, pg_size: 3 });
+    res = await LPOptimizer.optimize_change(compat({ prev_pgs: res.int_pgs, osd_tree: cur_tree, pg_size: 3 }));
     LPOptimizer.print_change_stats(res, false);
     assert(res.space == 24 && res.total_space == 24);
     console.log('\nAdding 3rd failure domain:');
     cur_tree['dom3'] = osd_tree['dom3'];
-    res = await LPOptimizer.optimize_change({ prev_pgs: res.int_pgs, osd_tree: cur_tree, pg_size: 3 });
+    res = await LPOptimizer.optimize_change(compat({ prev_pgs: res.int_pgs, osd_tree: cur_tree, pg_size: 3 }));
     LPOptimizer.print_change_stats(res, false);
     assert(res.space == 36 && res.total_space == 36);
     console.log('\nRemoving 3rd failure domain:');
     delete cur_tree['dom3'];
-    res = await LPOptimizer.optimize_change({ prev_pgs: res.int_pgs, osd_tree: cur_tree, pg_size: 3 });
+    res = await LPOptimizer.optimize_change(compat({ prev_pgs: res.int_pgs, osd_tree: cur_tree, pg_size: 3 }));
     LPOptimizer.print_change_stats(res, false);
     assert(res.space == 24 && res.total_space == 24);
     console.log('\nRemoving 2nd failure domain:');
     delete cur_tree['dom2'];
-    res = await LPOptimizer.optimize_change({ prev_pgs: res.int_pgs, osd_tree: cur_tree, pg_size: 3 });
+    res = await LPOptimizer.optimize_change(compat({ prev_pgs: res.int_pgs, osd_tree: cur_tree, pg_size: 3 }));
     LPOptimizer.print_change_stats(res, false);
     assert(res.space == 12 && res.total_space == 12);
     console.log('\nRemoving 1st failure domain:');
     delete cur_tree['dom1'];
-    res = await LPOptimizer.optimize_change({ prev_pgs: res.int_pgs, osd_tree: cur_tree, pg_size: 3 });
+    res = await LPOptimizer.optimize_change(compat({ prev_pgs: res.int_pgs, osd_tree: cur_tree, pg_size: 3 }));
     LPOptimizer.print_change_stats(res, false);
     assert(res.space == 0);
 }

mon/test-optimize-unfeasible.js

@@ -1,6 +1,7 @@
 // Copyright (c) Vitaliy Filippov, 2019+
 // License: VNPL-1.1 (see README.md for details)
 
+const { compat } = require('./simple_pgs.js');
 const LPOptimizer = require('./lp-optimizer.js');
 
 const osd_tree = {
@@ -20,13 +21,13 @@ async function run()
 {
     let res;
     console.log('256 PGs, 3+3 OSDs, size=2');
-    res = await LPOptimizer.optimize_initial({ osd_tree, pg_size: 2, pg_count: 256 });
+    res = await LPOptimizer.optimize_initial(compat({ osd_tree, pg_size: 2, pg_count: 256 }));
     LPOptimizer.print_change_stats(res, false);
 
     // Should NOT fail with the "unfeasible or unbounded" exception
     console.log('\nRemoving osd.2');
     delete osd_tree[100][2];
-    res = await LPOptimizer.optimize_change({ prev_pgs: res.int_pgs, osd_tree, pg_size: 2 });
+    res = await LPOptimizer.optimize_change(compat({ prev_pgs: res.int_pgs, osd_tree, pg_size: 2 }));
     LPOptimizer.print_change_stats(res, false);
 }
 

mon/test-optimize.js

@@ -1,6 +1,7 @@
 // Copyright (c) Vitaliy Filippov, 2019+
 // License: VNPL-1.1 (see README.md for details)
 
+const { compat, flatten_tree } = require('./simple_pgs.js');
 const LPOptimizer = require('./lp-optimizer.js');
 
 const osd_tree = {
@@ -84,31 +85,31 @@ async function run()
     // Space efficiency is ~99% in all cases.
 
     console.log('256 PGs, size=2');
-    res = await LPOptimizer.optimize_initial({ osd_tree, pg_size: 2, pg_count: 256 });
+    res = await LPOptimizer.optimize_initial(compat({ osd_tree, pg_size: 2, pg_count: 256 }));
     LPOptimizer.print_change_stats(res, false);
     console.log('\nAdding osd.8');
     osd_tree[500][8] = 3.58589;
-    res = await LPOptimizer.optimize_change({ prev_pgs: res.int_pgs, osd_tree, pg_size: 2 });
+    res = await LPOptimizer.optimize_change(compat({ prev_pgs: res.int_pgs, osd_tree, pg_size: 2 }));
     LPOptimizer.print_change_stats(res, false);
     console.log('\nRemoving osd.8');
     delete osd_tree[500][8];
-    res = await LPOptimizer.optimize_change({ prev_pgs: res.int_pgs, osd_tree, pg_size: 2 });
+    res = await LPOptimizer.optimize_change(compat({ prev_pgs: res.int_pgs, osd_tree, pg_size: 2 }));
     LPOptimizer.print_change_stats(res, false);
 
     console.log('\n256 PGs, size=3');
-    res = await LPOptimizer.optimize_initial({ osd_tree, pg_size: 3, pg_count: 256 });
+    res = await LPOptimizer.optimize_initial(compat({ osd_tree, pg_size: 3, pg_count: 256 }));
     LPOptimizer.print_change_stats(res, false);
     console.log('\nAdding osd.8');
     osd_tree[500][8] = 3.58589;
-    res = await LPOptimizer.optimize_change({ prev_pgs: res.int_pgs, osd_tree, pg_size: 3 });
+    res = await LPOptimizer.optimize_change(compat({ prev_pgs: res.int_pgs, osd_tree, pg_size: 3 }));
     LPOptimizer.print_change_stats(res, false);
     console.log('\nRemoving osd.8');
     delete osd_tree[500][8];
-    res = await LPOptimizer.optimize_change({ prev_pgs: res.int_pgs, osd_tree, pg_size: 3 });
+    res = await LPOptimizer.optimize_change(compat({ prev_pgs: res.int_pgs, osd_tree, pg_size: 3 }));
     LPOptimizer.print_change_stats(res, false);
 
     console.log('\n256 PGs, size=3, failure domain=rack');
-    res = await LPOptimizer.optimize_initial({ osd_tree: LPOptimizer.flatten_tree(crush_tree, {}, 1, 3), pg_size: 3, pg_count: 256 });
+    res = await LPOptimizer.optimize_initial(compat({ osd_tree: flatten_tree(crush_tree, {}, 1, 3), pg_size: 3, pg_count: 256 }));
     LPOptimizer.print_change_stats(res, false);
 }
 

mon/test-parse-dsl.js

@@ -0,0 +1,104 @@
+const { random_custom_combinations, index_tree, parse_level_indexes, parse_pg_dsl } = require('./dsl_pgs.js');
+
+function check(result, expected)
+{
+    console.dir(result, { depth: null });
+    if (JSON.stringify(result) !== JSON.stringify(expected))
+    {
+        process.stderr.write('Unexpected value, expected: ');
+        console.dir(expected, { depth: null });
+        process.exit(1);
+    }
+}
+
+check(
+    parse_pg_dsl("any, dc=1 host!=1, dc!=1, dc=3 host!=3, dc!=(1,3), dc=5 host!=5"),
+    [
+        [],
+        [ [ 'dc', '=', 1 ], [ 'host', '!=', 1 ] ],
+        [ [ 'dc', '!=', 1 ] ],
+        [ [ 'dc', '=', 3 ], [ 'host', '!=', 3 ] ],
+        [ [ 'dc', '!=', [ 1, 3 ] ] ],
+        [ [ 'dc', '=', 5 ], [ 'host', '!=', 5 ] ],
+    ]
+);
+
+check(
+    parse_pg_dsl("dc=meow, dc!=1, dc>2"),
+    [
+        [ [ 'dc', '=', { id: 'meow' } ] ],
+        [ [ 'dc', '!=', 1 ] ],
+        [ [ 'dc', '>', 2 ] ],
+    ]
+);
+
+check(
+    parse_level_indexes({ dc: '112233', host: 'ABCDEF' }),
+    [
+        [],
+        [ [ 'dc', '=', 1 ],         [ 'host', '!=', [ 1 ] ] ],
+        [ [ 'dc', '!=', [ 1 ] ],    [ 'host', '!=', [ 1, 2 ] ] ],
+        [ [ 'dc', '=', 3 ],         [ 'host', '!=', [ 1, 2, 3 ] ] ],
+        [ [ 'dc', '!=', [ 1, 3 ] ], [ 'host', '!=', [ 1, 2, 3, 4 ] ] ],
+        [ [ 'dc', '=', 5 ],         [ 'host', '!=', [ 1, 2, 3, 4, 5 ] ] ],
+    ]
+);
+
+check(
+    parse_level_indexes({ dc: '112233', host: 'ABCDEF' }, [ 'dc', 'host' ]),
+    [
+        [],
+        [ [ 'dc', '=', 1 ],         [ 'host', '!=', [ 1 ] ] ],
+        [ [ 'dc', '!=', [ 1 ] ] ],
+        [ [ 'dc', '=', 3 ],         [ 'host', '!=', [ 3 ] ] ],
+        [ [ 'dc', '!=', [ 1, 3 ] ] ],
+        [ [ 'dc', '=', 5 ],         [ 'host', '!=', [ 5 ] ] ],
+    ]
+);
+
+check(
+    parse_level_indexes({ dc: '112211223333', host: '123456789ABC' }),
+    [
+        [],
+        [ [ 'dc', '=', 1 ],         [ 'host', '!=', [ 1 ] ] ],
+        [ [ 'dc', '!=', [ 1 ] ],    [ 'host', '!=', [ 1, 2 ] ] ],
+        [ [ 'dc', '=', 3 ],         [ 'host', '!=', [ 1, 2, 3 ] ] ],
+        [ [ 'dc', '=', 1 ],         [ 'host', '!=', [ 1, 2, 3, 4 ] ] ],
+        [ [ 'dc', '=', 1 ],         [ 'host', '!=', [ 1, 2, 3, 4, 5 ] ] ],
+        [ [ 'dc', '=', 3 ],         [ 'host', '!=', [ 1, 2, 3, 4, 5, 6 ] ] ],
+        [ [ 'dc', '=', 3 ],         [ 'host', '!=', [ 1, 2, 3, 4, 5, 6, 7 ] ] ],
+        [ [ 'dc', '!=', [ 1, 3 ] ], [ 'host', '!=', [ 1, 2, 3, 4, 5, 6, 7, 8 ] ] ],
+        [ [ 'dc', '=', 9 ],         [ 'host', '!=', [ 1, 2, 3, 4, 5, 6, 7, 8, 9 ] ] ],
+        [ [ 'dc', '=', 9 ],         [ 'host', '!=', [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ] ] ],
+        [ [ 'dc', '=', 9 ],         [ 'host', '!=', [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 ] ] ],
+    ]
+);
+
+check(
+    parse_level_indexes({ dc: '112211223333', host: '123456789ABC' }, [ 'dc', 'host' ]),
+    [
+        [],
+        [ [ 'dc', '=', 1 ], [ 'host', '!=', [ 1 ] ] ],
+        [ [ 'dc', '!=', [ 1 ] ] ],
+        [ [ 'dc', '=', 3 ], [ 'host', '!=', [ 3 ] ] ],
+        [ [ 'dc', '=', 1 ], [ 'host', '!=', [ 1, 2 ] ] ],
+        [ [ 'dc', '=', 1 ], [ 'host', '!=', [ 1, 2, 5 ] ] ],
+        [ [ 'dc', '=', 3 ], [ 'host', '!=', [ 3, 4 ] ] ],
+        [ [ 'dc', '=', 3 ], [ 'host', '!=', [ 3, 4, 7 ] ] ],
+        [ [ 'dc', '!=', [ 1, 3 ] ] ],
+        [ [ 'dc', '=', 9 ], [ 'host', '!=', [ 9 ] ] ],
+        [ [ 'dc', '=', 9 ], [ 'host', '!=', [ 9, 10 ] ] ],
+        [ [ 'dc', '=', 9 ], [ 'host', '!=', [ 9, 10, 11 ] ] ]
+    ]
+);
+
+check(
+    Object.keys(random_custom_combinations(index_tree([
+        { id: '1', size: 1, level: 'osd' },
+        { id: '2', size: 2, level: 'osd' },
+        { id: '3', size: 3, level: 'osd' }
+    ]), parse_level_indexes({ osd: '12' }), 10000)).sort(),
+    [ 'pg_1_2', 'pg_1_3', 'pg_2_3' ]
+);
+
+console.log('OK');

patches/cinder-vitastor.py

@@ -50,7 +50,7 @@ from cinder.volume import configuration
 from cinder.volume import driver
 from cinder.volume import volume_utils
 
-VERSION = '1.4.7'
+VERSION = '1.5.0'
 
 LOG = logging.getLogger(__name__)
 

patches/libvirt-8.0-vitastor.diff

@@ -0,0 +1,692 @@
+commit d85024bd803b3b91f15578ed22de4ce31856626f
+Author: Vitaliy Filippov <vitalif@yourcmc.ru>
+Date:   Wed Jan 24 18:07:43 2024 +0300
+
+    Add Vitastor support
+
+diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
+index 7fa5c2b8b5..2d77f391e7 100644
+--- a/docs/schemas/domaincommon.rng
++++ b/docs/schemas/domaincommon.rng
+@@ -1898,6 +1898,35 @@
+     </element>
+   </define>
+ 
++  <define name="diskSourceNetworkProtocolVitastor">
++    <element name="source">
++      <interleave>
++        <attribute name="protocol">
++          <value>vitastor</value>
++        </attribute>
++        <ref name="diskSourceCommon"/>
++        <optional>
++          <attribute name="name"/>
++        </optional>
++        <optional>
++          <attribute name="query"/>
++        </optional>
++        <zeroOrMore>
++          <ref name="diskSourceNetworkHost"/>
++        </zeroOrMore>
++        <optional>
++          <element name="config">
++            <attribute name="file">
++              <ref name="absFilePath"/>
++            </attribute>
++            <empty/>
++          </element>
++        </optional>
++        <empty/>
++      </interleave>
++    </element>
++  </define>
++
+   <define name="diskSourceNetworkProtocolISCSI">
+     <element name="source">
+       <attribute name="protocol">
+@@ -2154,6 +2183,7 @@
+       <ref name="diskSourceNetworkProtocolSimple"/>
+       <ref name="diskSourceNetworkProtocolVxHS"/>
+       <ref name="diskSourceNetworkProtocolNFS"/>
++      <ref name="diskSourceNetworkProtocolVitastor"/>
+     </choice>
+   </define>
+ 
+diff --git a/include/libvirt/libvirt-storage.h b/include/libvirt/libvirt-storage.h
+index f89856b93e..a8cb9387e2 100644
+--- a/include/libvirt/libvirt-storage.h
++++ b/include/libvirt/libvirt-storage.h
+@@ -246,6 +246,7 @@ typedef enum {
+     VIR_CONNECT_LIST_STORAGE_POOLS_ZFS           = 1 << 17,
+     VIR_CONNECT_LIST_STORAGE_POOLS_VSTORAGE      = 1 << 18,
+     VIR_CONNECT_LIST_STORAGE_POOLS_ISCSI_DIRECT  = 1 << 19,
++    VIR_CONNECT_LIST_STORAGE_POOLS_VITASTOR      = 1 << 20,
+ } virConnectListAllStoragePoolsFlags;
+ 
+ int                     virConnectListAllStoragePools(virConnectPtr conn,
+diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
+index 5691b8d2d5..6669e8451d 100644
+--- a/src/conf/domain_conf.c
++++ b/src/conf/domain_conf.c
+@@ -8293,7 +8293,8 @@ virDomainDiskSourceNetworkParse(xmlNodePtr node,
+     src->configFile = virXPathString("string(./config/@file)", ctxt);
+ 
+     if (src->protocol == VIR_STORAGE_NET_PROTOCOL_HTTP ||
+-        src->protocol == VIR_STORAGE_NET_PROTOCOL_HTTPS)
++        src->protocol == VIR_STORAGE_NET_PROTOCOL_HTTPS ||
++        src->protocol == VIR_STORAGE_NET_PROTOCOL_VITASTOR)
+         src->query = virXMLPropString(node, "query");
+ 
+     if (virDomainStorageNetworkParseHosts(node, ctxt, &src->hosts, &src->nhosts) < 0)
+@@ -31267,6 +31268,7 @@ virDomainStorageSourceTranslateSourcePool(virStorageSource *src,
+ 
+     case VIR_STORAGE_POOL_MPATH:
+     case VIR_STORAGE_POOL_RBD:
++    case VIR_STORAGE_POOL_VITASTOR:
+     case VIR_STORAGE_POOL_SHEEPDOG:
+     case VIR_STORAGE_POOL_GLUSTER:
+     case VIR_STORAGE_POOL_LAST:
+diff --git a/src/conf/domain_validate.c b/src/conf/domain_validate.c
+index a4271f1247..621c1b7b31 100644
+--- a/src/conf/domain_validate.c
++++ b/src/conf/domain_validate.c
+@@ -508,7 +508,7 @@ virDomainDiskDefValidateSourceChainOne(const virStorageSource *src)
+         }
+     }
+ 
+-    /* internal snapshots and config files are currently supported only with rbd: */
++    /* internal snapshots are currently supported only with rbd: */
+     if (virStorageSourceGetActualType(src) != VIR_STORAGE_TYPE_NETWORK &&
+         src->protocol != VIR_STORAGE_NET_PROTOCOL_RBD) {
+         if (src->snapshot) {
+@@ -517,11 +517,15 @@ virDomainDiskDefValidateSourceChainOne(const virStorageSource *src)
+                              "only with 'rbd' disks"));
+             return -1;
+         }
+-
++    }
++    /* config files are currently supported only with rbd and vitastor: */
++    if (virStorageSourceGetActualType(src) != VIR_STORAGE_TYPE_NETWORK &&
++        src->protocol != VIR_STORAGE_NET_PROTOCOL_RBD &&
++        src->protocol != VIR_STORAGE_NET_PROTOCOL_VITASTOR) {
+         if (src->configFile) {
+             virReportError(VIR_ERR_XML_ERROR, "%s",
+                            _("<config> element is currently supported "
+-                             "only with 'rbd' disks"));
++                             "only with 'rbd' and 'vitastor' disks"));
+             return -1;
+         }
+     }
+diff --git a/src/conf/storage_conf.c b/src/conf/storage_conf.c
+index 6690d26ffd..2255df9d28 100644
+--- a/src/conf/storage_conf.c
++++ b/src/conf/storage_conf.c
+@@ -60,7 +60,7 @@ VIR_ENUM_IMPL(virStoragePool,
+               "logical", "disk", "iscsi",
+               "iscsi-direct", "scsi", "mpath",
+               "rbd", "sheepdog", "gluster",
+-              "zfs", "vstorage",
++              "zfs", "vstorage", "vitastor",
+ );
+ 
+ VIR_ENUM_IMPL(virStoragePoolFormatFileSystem,
+@@ -246,6 +246,18 @@ static virStoragePoolTypeInfo poolTypeInfo[] = {
+           .formatToString = virStorageFileFormatTypeToString,
+       }
+     },
++    {.poolType = VIR_STORAGE_POOL_VITASTOR,
++     .poolOptions = {
++         .flags = (VIR_STORAGE_POOL_SOURCE_HOST |
++                   VIR_STORAGE_POOL_SOURCE_NETWORK |
++                   VIR_STORAGE_POOL_SOURCE_NAME),
++      },
++      .volOptions = {
++          .defaultFormat = VIR_STORAGE_FILE_RAW,
++          .formatFromString = virStorageVolumeFormatFromString,
++          .formatToString = virStorageFileFormatTypeToString,
++      }
++    },
+     {.poolType = VIR_STORAGE_POOL_SHEEPDOG,
+      .poolOptions = {
+          .flags = (VIR_STORAGE_POOL_SOURCE_HOST |
+@@ -546,6 +558,11 @@ virStoragePoolDefParseSource(xmlXPathContextPtr ctxt,
+                        _("element 'name' is mandatory for RBD pool"));
+         return -1;
+     }
++    if (pool_type == VIR_STORAGE_POOL_VITASTOR && source->name == NULL) {
++        virReportError(VIR_ERR_XML_ERROR, "%s",
++                       _("element 'name' is mandatory for Vitastor pool"));
++        return -1;
++    }
+ 
+     if (options->formatFromString) {
+         g_autofree char *format = NULL;
+@@ -1176,6 +1193,7 @@ virStoragePoolDefFormatBuf(virBuffer *buf,
+     /* RBD, Sheepdog, Gluster and Iscsi-direct devices are not local block devs nor
+      * files, so they don't have a target */
+     if (def->type != VIR_STORAGE_POOL_RBD &&
++        def->type != VIR_STORAGE_POOL_VITASTOR &&
+         def->type != VIR_STORAGE_POOL_SHEEPDOG &&
+         def->type != VIR_STORAGE_POOL_GLUSTER &&
+         def->type != VIR_STORAGE_POOL_ISCSI_DIRECT) {
+diff --git a/src/conf/storage_conf.h b/src/conf/storage_conf.h
+index aaecf138d6..97172db38b 100644
+--- a/src/conf/storage_conf.h
++++ b/src/conf/storage_conf.h
+@@ -106,6 +106,7 @@ typedef enum {
+     VIR_STORAGE_POOL_GLUSTER,  /* Gluster device */
+     VIR_STORAGE_POOL_ZFS,      /* ZFS */
+     VIR_STORAGE_POOL_VSTORAGE, /* Virtuozzo Storage */
++    VIR_STORAGE_POOL_VITASTOR, /* Vitastor */
+ 
+     VIR_STORAGE_POOL_LAST,
+ } virStoragePoolType;
+@@ -466,6 +467,7 @@ VIR_ENUM_DECL(virStoragePartedFs);
+                  VIR_CONNECT_LIST_STORAGE_POOLS_SCSI     | \
+                  VIR_CONNECT_LIST_STORAGE_POOLS_MPATH    | \
+                  VIR_CONNECT_LIST_STORAGE_POOLS_RBD      | \
++                 VIR_CONNECT_LIST_STORAGE_POOLS_VITASTOR | \
+                  VIR_CONNECT_LIST_STORAGE_POOLS_SHEEPDOG | \
+                  VIR_CONNECT_LIST_STORAGE_POOLS_GLUSTER  | \
+                  VIR_CONNECT_LIST_STORAGE_POOLS_ZFS      | \
+diff --git a/src/conf/storage_source_conf.c b/src/conf/storage_source_conf.c
+index d42f715f26..29d8da3d10 100644
+--- a/src/conf/storage_source_conf.c
++++ b/src/conf/storage_source_conf.c
+@@ -86,6 +86,7 @@ VIR_ENUM_IMPL(virStorageNetProtocol,
+               "ssh",
+               "vxhs",
+               "nfs",
++              "vitastor",
+ );
+ 
+ 
+@@ -1265,6 +1266,7 @@ virStorageSourceNetworkDefaultPort(virStorageNetProtocol protocol)
+         case VIR_STORAGE_NET_PROTOCOL_GLUSTER:
+             return 24007;
+ 
++        case VIR_STORAGE_NET_PROTOCOL_VITASTOR:
+         case VIR_STORAGE_NET_PROTOCOL_RBD:
+             /* we don't provide a default for RBD */
+             return 0;
+diff --git a/src/conf/storage_source_conf.h b/src/conf/storage_source_conf.h
+index c4a026881c..67568e9181 100644
+--- a/src/conf/storage_source_conf.h
++++ b/src/conf/storage_source_conf.h
+@@ -128,6 +128,7 @@ typedef enum {
+     VIR_STORAGE_NET_PROTOCOL_SSH,
+     VIR_STORAGE_NET_PROTOCOL_VXHS,
+     VIR_STORAGE_NET_PROTOCOL_NFS,
++    VIR_STORAGE_NET_PROTOCOL_VITASTOR,
+ 
+     VIR_STORAGE_NET_PROTOCOL_LAST
+ } virStorageNetProtocol;
+diff --git a/src/conf/virstorageobj.c b/src/conf/virstorageobj.c
+index 02903ac487..504df599fb 100644
+--- a/src/conf/virstorageobj.c
++++ b/src/conf/virstorageobj.c
+@@ -1481,6 +1481,7 @@ virStoragePoolObjSourceFindDuplicateCb(const void *payload,
+             return 1;
+         break;
+ 
++    case VIR_STORAGE_POOL_VITASTOR:
+     case VIR_STORAGE_POOL_RBD:
+     case VIR_STORAGE_POOL_LAST:
+         break;
+@@ -1978,6 +1979,8 @@ virStoragePoolObjMatch(virStoragePoolObj *obj,
+                (obj->def->type == VIR_STORAGE_POOL_MPATH))   ||
+               (MATCH(VIR_CONNECT_LIST_STORAGE_POOLS_RBD) &&
+                (obj->def->type == VIR_STORAGE_POOL_RBD))     ||
++              (MATCH(VIR_CONNECT_LIST_STORAGE_POOLS_VITASTOR) &&
++               (obj->def->type == VIR_STORAGE_POOL_VITASTOR)) ||
+               (MATCH(VIR_CONNECT_LIST_STORAGE_POOLS_SHEEPDOG) &&
+                (obj->def->type == VIR_STORAGE_POOL_SHEEPDOG)) ||
+               (MATCH(VIR_CONNECT_LIST_STORAGE_POOLS_GLUSTER) &&
+diff --git a/src/libvirt-storage.c b/src/libvirt-storage.c
+index cbc522b300..b4760fa58d 100644
+--- a/src/libvirt-storage.c
++++ b/src/libvirt-storage.c
+@@ -92,6 +92,7 @@ virStoragePoolGetConnect(virStoragePoolPtr pool)
+  * VIR_CONNECT_LIST_STORAGE_POOLS_SCSI
+  * VIR_CONNECT_LIST_STORAGE_POOLS_MPATH
+  * VIR_CONNECT_LIST_STORAGE_POOLS_RBD
++ * VIR_CONNECT_LIST_STORAGE_POOLS_VITASTOR
+  * VIR_CONNECT_LIST_STORAGE_POOLS_SHEEPDOG
+  * VIR_CONNECT_LIST_STORAGE_POOLS_GLUSTER
+  * VIR_CONNECT_LIST_STORAGE_POOLS_ZFS
+diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c
+index 1ac6253ad7..abe4587f94 100644
+--- a/src/libxl/libxl_conf.c
++++ b/src/libxl/libxl_conf.c
+@@ -962,6 +962,7 @@ libxlMakeNetworkDiskSrcStr(virStorageSource *src,
+     case VIR_STORAGE_NET_PROTOCOL_SSH:
+     case VIR_STORAGE_NET_PROTOCOL_VXHS:
+     case VIR_STORAGE_NET_PROTOCOL_NFS:
++    case VIR_STORAGE_NET_PROTOCOL_VITASTOR:
+     case VIR_STORAGE_NET_PROTOCOL_LAST:
+     case VIR_STORAGE_NET_PROTOCOL_NONE:
+         virReportError(VIR_ERR_NO_SUPPORT,
+diff --git a/src/libxl/xen_xl.c b/src/libxl/xen_xl.c
+index 7604e3d534..6453bb9776 100644
+--- a/src/libxl/xen_xl.c
++++ b/src/libxl/xen_xl.c
+@@ -1506,6 +1506,7 @@ xenFormatXLDiskSrcNet(virStorageSource *src)
+     case VIR_STORAGE_NET_PROTOCOL_SSH:
+     case VIR_STORAGE_NET_PROTOCOL_VXHS:
+     case VIR_STORAGE_NET_PROTOCOL_NFS:
++    case VIR_STORAGE_NET_PROTOCOL_VITASTOR:
+     case VIR_STORAGE_NET_PROTOCOL_LAST:
+     case VIR_STORAGE_NET_PROTOCOL_NONE:
+         virReportError(VIR_ERR_NO_SUPPORT,
+diff --git a/src/qemu/qemu_block.c b/src/qemu/qemu_block.c
+index e5ff653a60..884ecc79ea 100644
+--- a/src/qemu/qemu_block.c
++++ b/src/qemu/qemu_block.c
+@@ -943,6 +943,38 @@ qemuBlockStorageSourceGetRBDProps(virStorageSource *src,
+ }
+ 
+ 
++static virJSONValue *
++qemuBlockStorageSourceGetVitastorProps(virStorageSource *src)
++{
++    virJSONValue *ret = NULL;
++    virStorageNetHostDef *host;
++    size_t i;
++    g_auto(virBuffer) buf = VIR_BUFFER_INITIALIZER;
++    g_autofree char *etcd = NULL;
++
++    for (i = 0; i < src->nhosts; i++) {
++        host = src->hosts + i;
++        if ((virStorageNetHostTransport)host->transport != VIR_STORAGE_NET_HOST_TRANS_TCP) {
++            return NULL;
++        }
++        virBufferAsprintf(&buf, i > 0 ? ",%s:%u" : "%s:%u", host->name, host->port);
++    }
++    if (src->nhosts > 0) {
++        etcd = virBufferContentAndReset(&buf);
++    }
++
++    if (virJSONValueObjectCreate(&ret,
++                                 "S:etcd-host", etcd,
++                                 "S:etcd-prefix", src->query,
++                                 "S:config-path", src->configFile,
++                                 "s:image", src->path,
++                                 NULL) < 0)
++        return NULL;
++
++    return ret;
++}
++
++
+ static virJSONValue *
+ qemuBlockStorageSourceGetSheepdogProps(virStorageSource *src)
+ {
+@@ -1233,6 +1265,12 @@ qemuBlockStorageSourceGetBackendProps(virStorageSource *src,
+                 return NULL;
+             break;
+ 
++        case VIR_STORAGE_NET_PROTOCOL_VITASTOR:
++            driver = "vitastor";
++            if (!(fileprops = qemuBlockStorageSourceGetVitastorProps(src)))
++                return NULL;
++            break;
++
+         case VIR_STORAGE_NET_PROTOCOL_SHEEPDOG:
+             driver = "sheepdog";
+             if (!(fileprops = qemuBlockStorageSourceGetSheepdogProps(src)))
+@@ -2244,6 +2282,7 @@ qemuBlockGetBackingStoreString(virStorageSource *src,
+ 
+             case VIR_STORAGE_NET_PROTOCOL_SHEEPDOG:
+             case VIR_STORAGE_NET_PROTOCOL_RBD:
++            case VIR_STORAGE_NET_PROTOCOL_VITASTOR:
+             case VIR_STORAGE_NET_PROTOCOL_VXHS:
+             case VIR_STORAGE_NET_PROTOCOL_NFS:
+             case VIR_STORAGE_NET_PROTOCOL_SSH:
+@@ -2626,6 +2665,12 @@ qemuBlockStorageSourceCreateGetStorageProps(virStorageSource *src,
+                 return -1;
+             break;
+ 
++        case VIR_STORAGE_NET_PROTOCOL_VITASTOR:
++            driver = "vitastor";
++            if (!(location = qemuBlockStorageSourceGetVitastorProps(src)))
++                return -1;
++            break;
++
+         case VIR_STORAGE_NET_PROTOCOL_SHEEPDOG:
+             driver = "sheepdog";
+             if (!(location = qemuBlockStorageSourceGetSheepdogProps(src)))
+diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
+index d822533ccb..afe2087303 100644
+--- a/src/qemu/qemu_command.c
++++ b/src/qemu/qemu_command.c
+@@ -1723,6 +1723,43 @@ qemuBuildNetworkDriveStr(virStorageSource *src,
+             ret = virBufferContentAndReset(&buf);
+             break;
+ 
++        case VIR_STORAGE_NET_PROTOCOL_VITASTOR:
++            if (strchr(src->path, ':')) {
++                virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
++                               _("':' not allowed in Vitastor source volume name '%s'"),
++                               src->path);
++                return NULL;
++            }
++
++            virBufferStrcat(&buf, "vitastor:image=", src->path, NULL);
++
++            if (src->nhosts > 0) {
++                virBufferAddLit(&buf, ":etcd-host=");
++                for (i = 0; i < src->nhosts; i++) {
++                    if (i)
++                        virBufferAddLit(&buf, ",");
++
++                    /* assume host containing : is ipv6 */
++                    if (strchr(src->hosts[i].name, ':'))
++                        virBufferEscape(&buf, '\\', ":", "[%s]",
++                                        src->hosts[i].name);
++                    else
++                        virBufferAsprintf(&buf, "%s", src->hosts[i].name);
++
++                    if (src->hosts[i].port)
++                        virBufferAsprintf(&buf, "\\:%u", src->hosts[i].port);
++                }
++            }
++
++            if (src->configFile)
++                virBufferEscape(&buf, '\\', ":", ":config-path=%s", src->configFile);
++
++            if (src->query)
++                virBufferEscape(&buf, '\\', ":", ":etcd-prefix=%s", src->query);
++
++            ret = virBufferContentAndReset(&buf);
++            break;
++
+         case VIR_STORAGE_NET_PROTOCOL_VXHS:
+             virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                            _("VxHS protocol does not support URI syntax"));
+diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
+index a8401bac30..3dc1fe6db0 100644
+--- a/src/qemu/qemu_domain.c
++++ b/src/qemu/qemu_domain.c
+@@ -4731,7 +4731,8 @@ qemuDomainValidateStorageSource(virStorageSource *src,
+     if (src->query &&
+         (actualType != VIR_STORAGE_TYPE_NETWORK ||
+          (src->protocol != VIR_STORAGE_NET_PROTOCOL_HTTPS &&
+-          src->protocol != VIR_STORAGE_NET_PROTOCOL_HTTP))) {
++          src->protocol != VIR_STORAGE_NET_PROTOCOL_HTTP &&
++          src->protocol != VIR_STORAGE_NET_PROTOCOL_VITASTOR))) {
+         virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                        _("query is supported only with HTTP(S) protocols"));
+         return -1;
+@@ -9919,6 +9920,7 @@ qemuDomainPrepareStorageSourceTLS(virStorageSource *src,
+         break;
+ 
+     case VIR_STORAGE_NET_PROTOCOL_RBD:
++    case VIR_STORAGE_NET_PROTOCOL_VITASTOR:
+     case VIR_STORAGE_NET_PROTOCOL_SHEEPDOG:
+     case VIR_STORAGE_NET_PROTOCOL_GLUSTER:
+     case VIR_STORAGE_NET_PROTOCOL_ISCSI:
+diff --git a/src/qemu/qemu_snapshot.c b/src/qemu/qemu_snapshot.c
+index f92e00f9c0..854a3fbc90 100644
+--- a/src/qemu/qemu_snapshot.c
++++ b/src/qemu/qemu_snapshot.c
+@@ -393,6 +393,7 @@ qemuSnapshotPrepareDiskExternalInactive(virDomainSnapshotDiskDef *snapdisk,
+         case VIR_STORAGE_NET_PROTOCOL_NONE:
+         case VIR_STORAGE_NET_PROTOCOL_NBD:
+         case VIR_STORAGE_NET_PROTOCOL_RBD:
++        case VIR_STORAGE_NET_PROTOCOL_VITASTOR:
+         case VIR_STORAGE_NET_PROTOCOL_SHEEPDOG:
+         case VIR_STORAGE_NET_PROTOCOL_GLUSTER:
+         case VIR_STORAGE_NET_PROTOCOL_ISCSI:
+@@ -485,6 +486,7 @@ qemuSnapshotPrepareDiskExternalActive(virDomainObj *vm,
+         case VIR_STORAGE_NET_PROTOCOL_NONE:
+         case VIR_STORAGE_NET_PROTOCOL_NBD:
+         case VIR_STORAGE_NET_PROTOCOL_RBD:
++        case VIR_STORAGE_NET_PROTOCOL_VITASTOR:
+         case VIR_STORAGE_NET_PROTOCOL_SHEEPDOG:
+         case VIR_STORAGE_NET_PROTOCOL_ISCSI:
+         case VIR_STORAGE_NET_PROTOCOL_HTTP:
+@@ -638,6 +640,7 @@ qemuSnapshotPrepareDiskInternal(virDomainDiskDef *disk,
+         case VIR_STORAGE_NET_PROTOCOL_NONE:
+         case VIR_STORAGE_NET_PROTOCOL_NBD:
+         case VIR_STORAGE_NET_PROTOCOL_RBD:
++        case VIR_STORAGE_NET_PROTOCOL_VITASTOR:
+         case VIR_STORAGE_NET_PROTOCOL_SHEEPDOG:
+         case VIR_STORAGE_NET_PROTOCOL_GLUSTER:
+         case VIR_STORAGE_NET_PROTOCOL_ISCSI:
+diff --git a/src/storage/storage_driver.c b/src/storage/storage_driver.c
+index 4df2c75a2b..5a5e48ef71 100644
+--- a/src/storage/storage_driver.c
++++ b/src/storage/storage_driver.c
+@@ -1643,6 +1643,7 @@ storageVolLookupByPathCallback(virStoragePoolObj *obj,
+ 
+         case VIR_STORAGE_POOL_GLUSTER:
+         case VIR_STORAGE_POOL_RBD:
++        case VIR_STORAGE_POOL_VITASTOR:
+         case VIR_STORAGE_POOL_SHEEPDOG:
+         case VIR_STORAGE_POOL_ZFS:
+         case VIR_STORAGE_POOL_LAST:
+diff --git a/src/storage_file/storage_source_backingstore.c b/src/storage_file/storage_source_backingstore.c
+index e48ae725ab..2017ccc88c 100644
+--- a/src/storage_file/storage_source_backingstore.c
++++ b/src/storage_file/storage_source_backingstore.c
+@@ -284,6 +284,75 @@ virStorageSourceParseRBDColonString(const char *rbdstr,
+ }
+ 
+ 
++static int
++virStorageSourceParseVitastorColonString(const char *colonstr,
++                                         virStorageSource *src)
++{
++    char *p, *e, *next;
++    g_autofree char *options = NULL;
++
++    /* optionally skip the "vitastor:" prefix if provided */
++    if (STRPREFIX(colonstr, "vitastor:"))
++        colonstr += strlen("vitastor:");
++
++    options = g_strdup(colonstr);
++
++    p = options;
++    while (*p) {
++        /* find : delimiter or end of string */
++        for (e = p; *e && *e != ':'; ++e) {
++            if (*e == '\\') {
++                e++;
++                if (*e == '\0')
++                    break;
++            }
++        }
++        if (*e == '\0') {
++            next = e;    /* last kv pair */
++        } else {
++            next = e + 1;
++            *e = '\0';
++        }
++
++        if (STRPREFIX(p, "image=")) {
++            src->path = g_strdup(p + strlen("image="));
++        } else if (STRPREFIX(p, "etcd-prefix=")) {
++            src->query = g_strdup(p + strlen("etcd-prefix="));
++        } else if (STRPREFIX(p, "config-path=")) {
++            src->configFile = g_strdup(p + strlen("config-path="));
++        } else if (STRPREFIX(p, "etcd-host=")) {
++            char *h, *sep;
++
++            h = p + strlen("etcd-host=");
++            while (h < e) {
++                for (sep = h; sep < e; ++sep) {
++                    if (*sep == '\\' && (sep[1] == ',' ||
++                                         sep[1] == ';' ||
++                                         sep[1] == ' ')) {
++                        *sep = '\0';
++                        sep += 2;
++                        break;
++                    }
++                }
++
++                if (virStorageSourceRBDAddHost(src, h) < 0)
++                    return -1;
++
++                h = sep;
++            }
++        }
++
++        p = next;
++    }
++
++    if (!src->path) {
++        return -1;
++    }
++
++    return 0;
++}
++
++
+ static int
+ virStorageSourceParseNBDColonString(const char *nbdstr,
+                                     virStorageSource *src)
+@@ -396,6 +465,11 @@ virStorageSourceParseBackingColon(virStorageSource *src,
+             return -1;
+         break;
+ 
++    case VIR_STORAGE_NET_PROTOCOL_VITASTOR:
++        if (virStorageSourceParseVitastorColonString(path, src) < 0)
++            return -1;
++        break;
++
+     case VIR_STORAGE_NET_PROTOCOL_SHEEPDOG:
+     case VIR_STORAGE_NET_PROTOCOL_LAST:
+     case VIR_STORAGE_NET_PROTOCOL_NONE:
+@@ -984,6 +1058,54 @@ virStorageSourceParseBackingJSONRBD(virStorageSource *src,
+     return 0;
+ }
+ 
++static int
++virStorageSourceParseBackingJSONVitastor(virStorageSource *src,
++                                         virJSONValue *json,
++                                         const char *jsonstr G_GNUC_UNUSED,
++                                         int opaque G_GNUC_UNUSED)
++{
++    const char *filename;
++    const char *image = virJSONValueObjectGetString(json, "image");
++    const char *conf = virJSONValueObjectGetString(json, "config-path");
++    const char *etcd_prefix = virJSONValueObjectGetString(json, "etcd-prefix");
++    virJSONValue *servers = virJSONValueObjectGetArray(json, "server");
++    size_t nservers;
++    size_t i;
++
++    src->type = VIR_STORAGE_TYPE_NETWORK;
++    src->protocol = VIR_STORAGE_NET_PROTOCOL_VITASTOR;
++
++    /* legacy syntax passed via 'filename' option */
++    if ((filename = virJSONValueObjectGetString(json, "filename")))
++        return virStorageSourceParseVitastorColonString(filename, src);
++
++    if (!image) {
++        virReportError(VIR_ERR_INVALID_ARG, "%s",
++                       _("missing image name in Vitastor backing volume "
++                         "JSON specification"));
++        return -1;
++    }
++
++    src->path = g_strdup(image);
++    src->configFile = g_strdup(conf);
++    src->query = g_strdup(etcd_prefix);
++
++    if (servers) {
++        nservers = virJSONValueArraySize(servers);
++
++        src->hosts = g_new0(virStorageNetHostDef, nservers);
++        src->nhosts = nservers;
++
++        for (i = 0; i < nservers; i++) {
++            if (virStorageSourceParseBackingJSONInetSocketAddress(src->hosts + i,
++                                                                  virJSONValueArrayGet(servers, i)) < 0)
++                return -1;
++        }
++    }
++
++    return 0;
++}
++
+ static int
+ virStorageSourceParseBackingJSONRaw(virStorageSource *src,
+                                     virJSONValue *json,
+@@ -1162,6 +1284,7 @@ static const struct virStorageSourceJSONDriverParser jsonParsers[] = {
+     {"sheepdog", false, virStorageSourceParseBackingJSONSheepdog, 0},
+     {"ssh", false, virStorageSourceParseBackingJSONSSH, 0},
+     {"rbd", false, virStorageSourceParseBackingJSONRBD, 0},
++    {"vitastor", false, virStorageSourceParseBackingJSONVitastor, 0},
+     {"raw", true, virStorageSourceParseBackingJSONRaw, 0},
+     {"nfs", false, virStorageSourceParseBackingJSONNFS, 0},
+     {"vxhs", false, virStorageSourceParseBackingJSONVxHS, 0},
+diff --git a/src/test/test_driver.c b/src/test/test_driver.c
+index 0e93b79922..b4d33f5f56 100644
+--- a/src/test/test_driver.c
++++ b/src/test/test_driver.c
+@@ -7367,6 +7367,7 @@ testStorageVolumeTypeForPool(int pooltype)
+     case VIR_STORAGE_POOL_ISCSI_DIRECT:
+     case VIR_STORAGE_POOL_GLUSTER:
+     case VIR_STORAGE_POOL_RBD:
++    case VIR_STORAGE_POOL_VITASTOR:
+         return VIR_STORAGE_VOL_NETWORK;
+     case VIR_STORAGE_POOL_LOGICAL:
+     case VIR_STORAGE_POOL_DISK:
+diff --git a/tests/storagepoolcapsschemadata/poolcaps-fs.xml b/tests/storagepoolcapsschemadata/poolcaps-fs.xml
+index eee75af746..8bd0a57bdd 100644
+--- a/tests/storagepoolcapsschemadata/poolcaps-fs.xml
++++ b/tests/storagepoolcapsschemadata/poolcaps-fs.xml
+@@ -204,4 +204,11 @@
+       </enum>
+     </volOptions>
+   </pool>
++  <pool type='vitastor' supported='no'>
++    <volOptions>
++      <defaultFormat type='raw'/>
++      <enum name='targetFormatType'>
++      </enum>
++    </volOptions>
++  </pool>
+ </storagepoolCapabilities>
+diff --git a/tests/storagepoolcapsschemadata/poolcaps-full.xml b/tests/storagepoolcapsschemadata/poolcaps-full.xml
+index 805950a937..852df0de16 100644
+--- a/tests/storagepoolcapsschemadata/poolcaps-full.xml
++++ b/tests/storagepoolcapsschemadata/poolcaps-full.xml
+@@ -204,4 +204,11 @@
+       </enum>
+     </volOptions>
+   </pool>
++  <pool type='vitastor' supported='yes'>
++    <volOptions>
++      <defaultFormat type='raw'/>
++      <enum name='targetFormatType'>
++      </enum>
++    </volOptions>
++  </pool>
+ </storagepoolCapabilities>
+diff --git a/tests/storagepoolxml2argvtest.c b/tests/storagepoolxml2argvtest.c
+index 449b745519..7f95cc8e08 100644
+--- a/tests/storagepoolxml2argvtest.c
++++ b/tests/storagepoolxml2argvtest.c
+@@ -68,6 +68,7 @@ testCompareXMLToArgvFiles(bool shouldFail,
+     case VIR_STORAGE_POOL_GLUSTER:
+     case VIR_STORAGE_POOL_ZFS:
+     case VIR_STORAGE_POOL_VSTORAGE:
++    case VIR_STORAGE_POOL_VITASTOR:
+     case VIR_STORAGE_POOL_LAST:
+     default:
+         VIR_TEST_DEBUG("pool type '%s' has no xml2argv test", defTypeStr);
+diff --git a/tools/virsh-pool.c b/tools/virsh-pool.c
+index d391257f6e..46799c4a90 100644
+--- a/tools/virsh-pool.c
++++ b/tools/virsh-pool.c
+@@ -1213,6 +1213,9 @@ cmdPoolList(vshControl *ctl, const vshCmd *cmd G_GNUC_UNUSED)
+             case VIR_STORAGE_POOL_VSTORAGE:
+                 flags |= VIR_CONNECT_LIST_STORAGE_POOLS_VSTORAGE;
+                 break;
++            case VIR_STORAGE_POOL_VITASTOR:
++                flags |= VIR_CONNECT_LIST_STORAGE_POOLS_VITASTOR;
++                break;
+             case VIR_STORAGE_POOL_LAST:
+                 break;
+             }

rpm/build-tarball.sh

@@ -24,4 +24,4 @@ rm fio
 mv fio-copy fio
 FIO=`rpm -qi fio | perl -e 'while(<>) { /^Epoch[\s:]+(\S+)/ && print "$1:"; /^Version[\s:]+(\S+)/ && print $1; /^Release[\s:]+(\S+)/ && print "-$1"; }'`
 perl -i -pe 's/(Requires:\s*fio)([^\n]+)?/$1 = '$FIO'/' $VITASTOR/rpm/vitastor-el$EL.spec
-tar --transform 's#^#vitastor-1.4.7/#' --exclude 'rpm/*.rpm' -czf $VITASTOR/../vitastor-1.4.7$(rpm --eval '%dist').tar.gz *
+tar --transform 's#^#vitastor-1.5.0/#' --exclude 'rpm/*.rpm' -czf $VITASTOR/../vitastor-1.5.0$(rpm --eval '%dist').tar.gz *

rpm/vitastor-el7.Dockerfile

@@ -36,7 +36,7 @@ ADD . /root/vitastor
 RUN set -e; \
     cd /root/vitastor/rpm; \
     sh build-tarball.sh; \
-    cp /root/vitastor-1.4.7.el7.tar.gz ~/rpmbuild/SOURCES; \
+    cp /root/vitastor-1.5.0.el7.tar.gz ~/rpmbuild/SOURCES; \
     cp vitastor-el7.spec ~/rpmbuild/SPECS/vitastor.spec; \
     cd ~/rpmbuild/SPECS/; \
     rpmbuild -ba vitastor.spec; \

rpm/vitastor-el7.spec

@@ -1,11 +1,11 @@
 Name:           vitastor
-Version:        1.4.7
+Version:        1.5.0
 Release:        1%{?dist}
 Summary:        Vitastor, a fast software-defined clustered block storage
 
 License:        Vitastor Network Public License 1.1
 URL:            https://vitastor.io/
-Source0:        vitastor-1.4.7.el7.tar.gz
+Source0:        vitastor-1.5.0.el7.tar.gz
 
 BuildRequires:  liburing-devel >= 0.6
 BuildRequires:  gperftools-devel
@@ -149,9 +149,12 @@ mkdir -p /etc/vitastor
 %_bindir/vitastor-nfs
 %_bindir/vitastor-cli
 %_bindir/vitastor-rm
+%_bindir/vitastor-kv
+%_bindir/vitastor-kv-stress
 %_bindir/vita
 %_libdir/libvitastor_blk.so*
 %_libdir/libvitastor_client.so*
+%_libdir/libvitastor_kv.so*
 
 
 %files -n vitastor-client-devel

rpm/vitastor-el8.Dockerfile

@@ -35,7 +35,7 @@ ADD . /root/vitastor
 RUN set -e; \
     cd /root/vitastor/rpm; \
     sh build-tarball.sh; \
-    cp /root/vitastor-1.4.7.el8.tar.gz ~/rpmbuild/SOURCES; \
+    cp /root/vitastor-1.5.0.el8.tar.gz ~/rpmbuild/SOURCES; \
     cp vitastor-el8.spec ~/rpmbuild/SPECS/vitastor.spec; \
     cd ~/rpmbuild/SPECS/; \
     rpmbuild -ba vitastor.spec; \

rpm/vitastor-el8.spec

@@ -1,11 +1,11 @@
 Name:           vitastor
-Version:        1.4.7
+Version:        1.5.0
 Release:        1%{?dist}
 Summary:        Vitastor, a fast software-defined clustered block storage
 
 License:        Vitastor Network Public License 1.1
 URL:            https://vitastor.io/
-Source0:        vitastor-1.4.7.el8.tar.gz
+Source0:        vitastor-1.5.0.el8.tar.gz
 
 BuildRequires:  liburing-devel >= 0.6
 BuildRequires:  gperftools-devel
@@ -146,9 +146,12 @@ mkdir -p /etc/vitastor
 %_bindir/vitastor-nfs
 %_bindir/vitastor-cli
 %_bindir/vitastor-rm
+%_bindir/vitastor-kv
+%_bindir/vitastor-kv-stress
 %_bindir/vita
 %_libdir/libvitastor_blk.so*
 %_libdir/libvitastor_client.so*
+%_libdir/libvitastor_kv.so*
 
 
 %files -n vitastor-client-devel

rpm/vitastor-el9.Dockerfile

@@ -18,7 +18,7 @@ ADD . /root/vitastor
 RUN set -e; \
     cd /root/vitastor/rpm; \
     sh build-tarball.sh; \
-    cp /root/vitastor-1.4.7.el9.tar.gz ~/rpmbuild/SOURCES; \
+    cp /root/vitastor-1.5.0.el9.tar.gz ~/rpmbuild/SOURCES; \
     cp vitastor-el9.spec ~/rpmbuild/SPECS/vitastor.spec; \
     cd ~/rpmbuild/SPECS/; \
     rpmbuild -ba vitastor.spec; \

rpm/vitastor-el9.spec

@@ -1,11 +1,11 @@
 Name:           vitastor
-Version:        1.4.7
+Version:        1.5.0
 Release:        1%{?dist}
 Summary:        Vitastor, a fast software-defined clustered block storage
 
 License:        Vitastor Network Public License 1.1
 URL:            https://vitastor.io/
-Source0:        vitastor-1.4.7.el9.tar.gz
+Source0:        vitastor-1.5.0.el9.tar.gz
 
 BuildRequires:  liburing-devel >= 0.6
 BuildRequires:  gperftools-devel
@@ -139,9 +139,12 @@ mkdir -p /etc/vitastor
 %_bindir/vitastor-nfs
 %_bindir/vitastor-cli
 %_bindir/vitastor-rm
+%_bindir/vitastor-kv
+%_bindir/vitastor-kv-stress
 %_bindir/vita
 %_libdir/libvitastor_blk.so*
 %_libdir/libvitastor_client.so*
+%_libdir/libvitastor_kv.so*
 
 
 %files -n vitastor-client-devel

src/CMakeLists.txt

@@ -16,7 +16,7 @@ if("${CMAKE_INSTALL_PREFIX}" MATCHES "^/usr/local/?$")
 	set(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}")
 endif()
 
-add_definitions(-DVERSION="1.4.7")
+add_definitions(-DVERSION="1.5.0")
 add_definitions(-D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Wall -Wno-sign-compare -Wno-comment -Wno-parentheses -Wno-pointer-arith -fdiagnostics-color=always -fno-omit-frame-pointer -I ${CMAKE_SOURCE_DIR}/src)
 add_link_options(-fno-omit-frame-pointer)
 if (${WITH_ASAN})
@@ -25,15 +25,15 @@ if (${WITH_ASAN})
 endif (${WITH_ASAN})
 
 set(CMAKE_BUILD_TYPE RelWithDebInfo)
-string(REGEX REPLACE "([\\/\\-]O)[12]?" "\\13" CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}")
-string(REGEX REPLACE "([\\/\\-]O)[12]?" "\\13" CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL}")
-string(REGEX REPLACE "([\\/\\-]O)[12]?" "\\13" CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO}")
+string(REGEX REPLACE "([\\/\\-]O)[^ \t\r\n]*" "\\13" CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}")
+string(REGEX REPLACE "([\\/\\-]O)[^ \t\r\n]*" "\\13" CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL}")
+string(REGEX REPLACE "([\\/\\-]O)[^ \t\r\n]*" "\\13" CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO}")
 string(REGEX REPLACE "([\\/\\-]D) *NDEBUG" "" CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}")
 string(REGEX REPLACE "([\\/\\-]D) *NDEBUG" "" CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL}")
 string(REGEX REPLACE "([\\/\\-]D) *NDEBUG" "" CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO}")
-string(REGEX REPLACE "([\\/\\-]O)[12]?" "\\13" CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE}")
-string(REGEX REPLACE "([\\/\\-]O)[12]?" "\\13" CMAKE_C_FLAGS_MINSIZEREL "${CMAKE_C_FLAGS_MINSIZEREL}")
-string(REGEX REPLACE "([\\/\\-]O)[12]?" "\\13" CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELWITHDEBINFO}")
+string(REGEX REPLACE "([\\/\\-]O)[^ \t\r\n]*" "\\13" CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE}")
+string(REGEX REPLACE "([\\/\\-]O)[^ \t\r\n]*" "\\13" CMAKE_C_FLAGS_MINSIZEREL "${CMAKE_C_FLAGS_MINSIZEREL}")
+string(REGEX REPLACE "([\\/\\-]O)[^ \t\r\n]*" "\\13" CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELWITHDEBINFO}")
 string(REGEX REPLACE "([\\/\\-]D) *NDEBUG" "" CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE}")
 string(REGEX REPLACE "([\\/\\-]D) *NDEBUG" "" CMAKE_C_FLAGS_MINSIZEREL "${CMAKE_C_FLAGS_MINSIZEREL}")
 string(REGEX REPLACE "([\\/\\-]D) *NDEBUG" "" CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELWITHDEBINFO}")
@@ -145,7 +145,6 @@ add_library(vitastor_client SHARED
 	cli_status.cpp
 	cli_describe.cpp
 	cli_fix.cpp
-	cli_df.cpp
 	cli_ls.cpp
 	cli_create.cpp
 	cli_modify.cpp
@@ -154,6 +153,11 @@ add_library(vitastor_client SHARED
 	cli_rm_data.cpp
 	cli_rm.cpp
 	cli_rm_osd.cpp
+	cli_pool_cfg.cpp
+	cli_pool_create.cpp
+	cli_pool_ls.cpp
+	cli_pool_modify.cpp
+	cli_pool_rm.cpp
 )
 set_target_properties(vitastor_client PROPERTIES PUBLIC_HEADER "vitastor_c.h")
 target_link_libraries(vitastor_client
@@ -181,10 +185,48 @@ target_link_libraries(vitastor-nbd
 	vitastor_client
 )
 
+# libvitastor_kv.so
+add_library(vitastor_kv SHARED
+	kv_db.cpp
+	kv_db.h
+)
+target_link_libraries(vitastor_kv
+	vitastor_client
+)
+set_target_properties(vitastor_kv PROPERTIES VERSION ${VERSION} SOVERSION 0)
+
+# vitastor-kv
+add_executable(vitastor-kv
+	kv_cli.cpp
+)
+target_link_libraries(vitastor-kv
+	vitastor_kv
+)
+
+add_executable(vitastor-kv-stress
+	kv_stress.cpp
+)
+target_link_libraries(vitastor-kv-stress
+	vitastor_kv
+)
+
 # vitastor-nfs
 add_executable(vitastor-nfs
 	nfs_proxy.cpp
-	nfs_conn.cpp
+	nfs_block.cpp
+	nfs_kv.cpp
+	nfs_kv_create.cpp
+	nfs_kv_getattr.cpp
+	nfs_kv_link.cpp
+	nfs_kv_lookup.cpp
+	nfs_kv_read.cpp
+	nfs_kv_readdir.cpp
+	nfs_kv_remove.cpp
+	nfs_kv_rename.cpp
+	nfs_kv_setattr.cpp
+	nfs_kv_write.cpp
+	nfs_fsstat.cpp
+	nfs_mount.cpp
 	nfs_portmap.cpp
 	sha256.c
 	nfs/xdr_impl.cpp
@@ -194,6 +236,7 @@ add_executable(vitastor-nfs
 )
 target_link_libraries(vitastor-nfs
 	vitastor_client
+	vitastor_kv
 )
 
 # vitastor-cli
@@ -318,12 +361,12 @@ add_test(NAME test_cluster_client COMMAND test_cluster_client)
 
 ### Install
 
-install(TARGETS vitastor-osd vitastor-disk vitastor-nbd vitastor-nfs vitastor-cli RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+install(TARGETS vitastor-osd vitastor-disk vitastor-nbd vitastor-nfs vitastor-cli vitastor-kv vitastor-kv-stress RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
 install_symlink(vitastor-disk ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_BINDIR}/vitastor-dump-journal)
 install_symlink(vitastor-cli ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_BINDIR}/vitastor-rm)
 install_symlink(vitastor-cli ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_BINDIR}/vita)
 install(
-	TARGETS vitastor_blk vitastor_client
+	TARGETS vitastor_blk vitastor_client vitastor_kv
 	LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
 	PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
 )

src/blockstore.cpp

@@ -82,3 +82,8 @@ uint32_t blockstore_t::get_bitmap_granularity()
 {
     return impl->get_bitmap_granularity();
 }
+
+void blockstore_t::set_no_inode_stats(const std::vector<uint64_t> & pool_ids)
+{
+    impl->set_no_inode_stats(pool_ids);
+}

src/blockstore.h

@@ -216,6 +216,9 @@ public:
     // Get per-inode space usage statistics
     std::map<uint64_t, uint64_t> & get_inode_space_stats();
 
+    // Set per-pool no_inode_stats
+    void set_no_inode_stats(const std::vector<uint64_t> & pool_ids);
+
     // Print diagnostics to stdout
     void dump_diagnostics();
 

src/blockstore_impl.cpp

@@ -733,3 +733,86 @@ void blockstore_impl_t::disk_error_abort(const char *op, int retval, int expecte
     fprintf(stderr, "Disk %s failed: result is %d, expected %d. Can't continue, sorry :-(\n", op, retval, expected);
     exit(1);
 }
+
+void blockstore_impl_t::set_no_inode_stats(const std::vector<uint64_t> & pool_ids)
+{
+    for (auto & np: no_inode_stats)
+    {
+        np.second = 2;
+    }
+    for (auto pool_id: pool_ids)
+    {
+        if (!no_inode_stats[pool_id])
+            recalc_inode_space_stats(pool_id, false);
+        no_inode_stats[pool_id] = 1;
+    }
+    for (auto np_it = no_inode_stats.begin(); np_it != no_inode_stats.end(); )
+    {
+        if (np_it->second == 2)
+        {
+            recalc_inode_space_stats(np_it->first, true);
+            no_inode_stats.erase(np_it++);
+        }
+        else
+            np_it++;
+    }
+}
+
+void blockstore_impl_t::recalc_inode_space_stats(uint64_t pool_id, bool per_inode)
+{
+    auto sp_begin = inode_space_stats.lower_bound((pool_id << (64-POOL_ID_BITS)));
+    auto sp_end = inode_space_stats.lower_bound(((pool_id+1) << (64-POOL_ID_BITS)));
+    inode_space_stats.erase(sp_begin, sp_end);
+    auto sh_it = clean_db_shards.lower_bound((pool_id << (64-POOL_ID_BITS)));
+    while (sh_it != clean_db_shards.end() &&
+        (sh_it->first >> (64-POOL_ID_BITS)) == pool_id)
+    {
+        for (auto & pair: sh_it->second)
+        {
+            uint64_t space_id = per_inode ? pair.first.inode : (pool_id << (64-POOL_ID_BITS));
+            inode_space_stats[space_id] += dsk.data_block_size;
+        }
+        sh_it++;
+    }
+    object_id last_oid = {};
+    bool last_exists = false;
+    auto dirty_it = dirty_db.lower_bound((obj_ver_id){ .oid = { .inode = (pool_id << (64-POOL_ID_BITS)) } });
+    while (dirty_it != dirty_db.end() && (dirty_it->first.oid.inode >> (64-POOL_ID_BITS)) == pool_id)
+    {
+        if (IS_STABLE(dirty_it->second.state) && (IS_BIG_WRITE(dirty_it->second.state) || IS_DELETE(dirty_it->second.state)))
+        {
+            bool exists = false;
+            if (last_oid == dirty_it->first.oid)
+            {
+                exists = last_exists;
+            }
+            else
+            {
+                auto & clean_db = clean_db_shard(dirty_it->first.oid);
+                auto clean_it = clean_db.find(dirty_it->first.oid);
+                exists = clean_it != clean_db.end();
+            }
+            uint64_t space_id = per_inode ? dirty_it->first.oid.inode : (pool_id << (64-POOL_ID_BITS));
+            if (IS_BIG_WRITE(dirty_it->second.state))
+            {
+                if (!exists)
+                    inode_space_stats[space_id] += dsk.data_block_size;
+                last_exists = true;
+            }
+            else
+            {
+                if (exists)
+                {
+                    auto & sp = inode_space_stats[space_id];
+                    if (sp > dsk.data_block_size)
+                        sp -= dsk.data_block_size;
+                    else
+                        inode_space_stats.erase(space_id);
+                }
+                last_exists = false;
+            }
+            last_oid = dirty_it->first.oid;
+        }
+        dirty_it++;
+    }
+}

src/blockstore_impl.h

@@ -272,6 +272,7 @@ class blockstore_impl_t
 
     std::map<pool_id_t, pool_shard_settings_t> clean_db_settings;
     std::map<pool_pg_id_t, blockstore_clean_db_t> clean_db_shards;
+    std::map<uint64_t, int> no_inode_stats;
     uint8_t *clean_bitmaps = NULL;
     blockstore_dirty_db_t dirty_db;
     std::vector<blockstore_op_t*> submit_queue;
@@ -318,6 +319,7 @@ class blockstore_impl_t
 
     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);
+    void recalc_inode_space_stats(uint64_t pool_id, bool per_inode);
 
     // Journaling
     void prepare_journal_sector_write(int sector, blockstore_op_t *op);
@@ -428,6 +430,9 @@ public:
     // Space usage statistics
     std::map<uint64_t, uint64_t> inode_space_stats;
 
+    // Set per-pool no_inode_stats
+    void set_no_inode_stats(const std::vector<uint64_t> & pool_ids);
+
     // Print diagnostics to stdout
     void dump_diagnostics();
 

src/blockstore_init.cpp

@@ -32,7 +32,7 @@ void blockstore_init_meta::handle_event(ring_data_t *data, int buf_num)
     if (data->res < 0)
     {
         throw std::runtime_error(
-            std::string("read metadata failed at offset ") + std::to_string(bufs[buf_num].offset) +
+            std::string("read metadata failed at offset ") + std::to_string(buf_num >= 0 ? bufs[buf_num].offset : last_read_offset) +
             std::string(": ") + strerror(-data->res)
         );
     }
@@ -63,6 +63,7 @@ int blockstore_init_meta::loop()
         throw std::runtime_error("Failed to allocate metadata read buffer");
     // Read superblock
     GET_SQE();
+    last_read_offset = 0;
     data->iov = { metadata_buffer, (size_t)bs->dsk.meta_block_size };
     data->callback = [this](ring_data_t *data) { handle_event(data, -1); };
     my_uring_prep_readv(sqe, bs->dsk.meta_fd, &data->iov, 1, bs->dsk.meta_offset);
@@ -100,6 +101,7 @@ resume_1:
         {
             printf("Initializing metadata area\n");
             GET_SQE();
+            last_read_offset = 0;
             data->iov = (struct iovec){ metadata_buffer, (size_t)bs->dsk.meta_block_size };
             data->callback = [this](ring_data_t *data) { handle_event(data, -1); };
             my_uring_prep_writev(sqe, bs->dsk.meta_fd, &data->iov, 1, bs->dsk.meta_offset);
@@ -236,6 +238,7 @@ resume_2:
                 data->iov = { bufs[i].buf, (size_t)bufs[i].size };
                 data->callback = [this, i](ring_data_t *data) { handle_event(data, i); };
                 my_uring_prep_writev(sqe, bs->dsk.meta_fd, &data->iov, 1, bs->dsk.meta_offset + bufs[i].offset);
+                bs->ringloop->submit();
                 bufs[i].state = INIT_META_WRITING;
                 submitted++;
             }
@@ -259,9 +262,11 @@ resume_2:
             next_offset = entries_to_zero[i]/entries_per_block;
             for (j = i; j < entries_to_zero.size() && entries_to_zero[j]/entries_per_block == next_offset; j++) {}
             GET_SQE();
+            last_read_offset = (1+next_offset)*bs->dsk.meta_block_size;
             data->iov = { metadata_buffer, (size_t)bs->dsk.meta_block_size };
             data->callback = [this](ring_data_t *data) { handle_event(data, -1); };
             my_uring_prep_readv(sqe, bs->dsk.meta_fd, &data->iov, 1, bs->dsk.meta_offset + (1+next_offset)*bs->dsk.meta_block_size);
+            bs->ringloop->submit();
             submitted++;
 resume_5:
             if (submitted > 0)
@@ -278,6 +283,7 @@ resume_5:
             data->iov = { metadata_buffer, (size_t)bs->dsk.meta_block_size };
             data->callback = [this](ring_data_t *data) { handle_event(data, -1); };
             my_uring_prep_writev(sqe, bs->dsk.meta_fd, &data->iov, 1, bs->dsk.meta_offset + (1+next_offset)*bs->dsk.meta_block_size);
+            bs->ringloop->submit();
             submitted++;
 resume_6:
             if (submitted > 0)
@@ -299,6 +305,7 @@ resume_6:
     {
         GET_SQE();
         my_uring_prep_fsync(sqe, bs->dsk.meta_fd, IORING_FSYNC_DATASYNC);
+        last_read_offset = 0;
         data->iov = { 0 };
         data->callback = [this](ring_data_t *data) { handle_event(data, -1); };
         submitted++;

src/blockstore_init.h

@@ -23,6 +23,7 @@ class blockstore_init_meta
     struct ring_data_t *data;
     uint64_t md_offset = 0;
     uint64_t next_offset = 0;
+    uint64_t last_read_offset = 0;
     uint64_t entries_loaded = 0;
     unsigned entries_per_block = 0;
     int i = 0, j = 0;

src/blockstore_stable.cpp

@@ -487,18 +487,24 @@ void blockstore_impl_t::mark_stable(obj_ver_id v, bool forget_dirty)
                     }
                     if (!exists)
                     {
-                        inode_space_stats[dirty_it->first.oid.inode] += dsk.data_block_size;
+                        uint64_t space_id = dirty_it->first.oid.inode;
+                        if (no_inode_stats[dirty_it->first.oid.inode >> (64-POOL_ID_BITS)])
+                            space_id = space_id & ~(((uint64_t)1 << (64-POOL_ID_BITS)) - 1);
+                        inode_space_stats[space_id] += dsk.data_block_size;
                         used_blocks++;
                     }
                     big_to_flush++;
                 }
                 else if (IS_DELETE(dirty_it->second.state))
                 {
-                    auto & sp = inode_space_stats[dirty_it->first.oid.inode];
+                    uint64_t space_id = dirty_it->first.oid.inode;
+                    if (no_inode_stats[dirty_it->first.oid.inode >> (64-POOL_ID_BITS)])
+                        space_id = space_id & ~(((uint64_t)1 << (64-POOL_ID_BITS)) - 1);
+                    auto & sp = inode_space_stats[space_id];
                     if (sp > dsk.data_block_size)
                         sp -= dsk.data_block_size;
                     else
-                        inode_space_stats.erase(dirty_it->first.oid.inode);
+                        inode_space_stats.erase(space_id);
                     used_blocks--;
                     big_to_flush++;
                 }

src/cli.cpp

@@ -46,18 +46,21 @@ static const char* help_text =
     "vitastor-cli snap-create [-p|--pool <id|name>] <image>@<snapshot>\n"
     "  Create a snapshot of image <name>. May be used live if only a single writer is active.\n"
     "\n"
-    "vitastor-cli modify <name> [--rename <new-name>] [--resize <size>] [--readonly | --readwrite] [-f|--force]\n"
+    "vitastor-cli modify <name> [--rename <new-name>] [--resize <size>] [--readonly | --readwrite] [-f|--force] [--down-ok]\n"
     "  Rename, resize image or change its readonly status. Images with children can't be made read-write.\n"
     "  If the new size is smaller than the old size, extra data will be purged.\n"
     "  You should resize file system in the image, if present, before shrinking it.\n"
     "  -f|--force  Proceed with shrinking or setting readwrite flag even if the image has children.\n"
+    "  --down-ok   Proceed with shrinking even if some data will be left on unavailable OSDs.\n"
     "\n"
-    "vitastor-cli rm <from> [<to>] [--writers-stopped]\n"
+    "vitastor-cli rm <from> [<to>] [--writers-stopped] [--down-ok]\n"
     "  Remove <from> or all layers between <from> and <to> (<to> must be a child of <from>),\n"
     "  rebasing all their children accordingly. --writers-stopped allows merging to be a bit\n"
     "  more effective in case of a single 'slim' read-write child and 'fat' removed parent:\n"
     "  the child is merged into parent and parent is renamed to child in that case.\n"
     "  In other cases parent layers are always merged into children.\n"
+    "  Other options:\n"
+    "  --down-ok  Continue deletion/merging even if some data will be left on unavailable OSDs.\n"
     "\n"
     "vitastor-cli flatten <layer>\n"
     "  Flatten a layer, i.e. merge data and detach it from parents.\n"
@@ -113,6 +116,55 @@ static const char* help_text =
     "  With --dry-run only checks if deletion is possible without data loss and\n"
     "  redundancy degradation.\n"
     "\n"
+    "vitastor-cli create-pool|pool-create <name> (-s <pg_size>|--ec <N>+<K>) -n <pg_count> [OPTIONS]\n"
+    "  Create a pool. Required parameters:\n"
+    "    -s|--pg_size R   Number of replicas for replicated pools\n"
+    "    --ec N+K         Number of data (N) and parity (K) chunks for erasure-coded pools\n"
+    "    -n|--pg_count N  PG count for the new pool (start with 10*<OSD count>/pg_size rounded to a power of 2)\n"
+    "  Optional parameters:\n"
+    "    --pg_minsize <number>         R or N+K minus number of failures to tolerate without downtime\n"
+    "    --failure_domain host         Failure domain: host, osd or a level from placement_levels. Default: host\n"
+    "    --root_node <node>            Put pool only on child OSDs of this placement tree node\n"
+    "    --osd_tags <tag>[,<tag>]...   Put pool only on OSDs tagged with all specified tags\n"
+    "    --block_size 128k             Put pool only on OSDs with this data block size\n"
+    "    --bitmap_granularity 4k       Put pool only on OSDs with this logical sector size\n"
+    "    --immediate_commit none       Put pool only on OSDs with this or larger immediate_commit (none < small < all)\n"
+    "    --primary_affinity_tags tags  Prefer to put primary copies on OSDs with all specified tags\n"
+    "    --scrub_interval <time>       Enable regular scrubbing for this pool. Format: number + unit s/m/h/d/M/y\n"
+    "    --used_for_fs <name>          Mark pool as used for VitastorFS with metadata in image <name>\n"
+    "    --pg_stripe_size <number>     Increase object grouping stripe\n"
+    "    --max_osd_combinations 10000  Maximum number of random combinations for LP solver input\n"
+    "    --wait                        Wait for the new pool to come online\n"
+    "    -f|--force                    Do not check that cluster has enough OSDs to create the pool\n"
+    "  Examples:\n"
+    "    vitastor-cli create-pool test_x4 -s 4 -n 32\n"
+    "    vitastor-cli create-pool test_ec42 --ec 4+2 -n 32\n"
+    "\n"
+    "vitastor-cli modify-pool|pool-modify <id|name> [--name <new_name>] [PARAMETERS...]\n"
+    "  Modify an existing pool. Modifiable parameters:\n"
+    "    [-s|--pg_size <number>] [--pg_minsize <number>] [-n|--pg_count <count>]\n"
+    "    [--failure_domain <level>] [--root_node <node>] [--osd_tags <tags>] [--used_for_fs <name>]\n"
+    "    [--max_osd_combinations <number>] [--primary_affinity_tags <tags>] [--scrub_interval <time>]\n"
+    "  Non-modifiable parameters (changing them WILL lead to data loss):\n"
+    "    [--block_size <size>] [--bitmap_granularity <size>]\n"
+    "    [--immediate_commit <all|small|none>] [--pg_stripe_size <size>]\n"
+    "  These, however, can still be modified with -f|--force.\n"
+    "  See create-pool for parameter descriptions.\n"
+    "  Examples:\n"
+    "    vitastor-cli modify-pool pool_A --name pool_B\n"
+    "    vitastor-cli modify-pool 2 --pg_size 4 -n 128\n"
+    "\n"
+    "vitastor-cli rm-pool|pool-rm [--force] <id|name>\n"
+    "  Remove a pool. Refuses to remove pools with images without --force.\n"
+    "\n"
+    "vitastor-cli ls-pools|pool-ls|ls-pool|pools [-l] [--detail] [--sort FIELD] [-r] [-n N] [--stats] [<glob> ...]\n"
+    "  List pools (only matching <glob> patterns if passed).\n"
+    "  -l|--long       Also report I/O statistics\n"
+    "  --detail        Use list format (not table), show all details\n"
+    "  --sort FIELD    Sort by specified field (see fields in --json output)\n"
+    "  -r|--reverse    Sort in descending order\n"
+    "  -n|--count N    Only list first N items\n"
+    "\n"
     "Use vitastor-cli --help <command> for command details or vitastor-cli --help --all for all details.\n"
     "\n"
     "GLOBAL OPTIONS:\n"
@@ -122,7 +174,7 @@ static const char* help_text =
     "  --parallel_osds M   Work with M osds in parallel when possible (default 4)\n"
     "  --progress 1|0      Report progress (default 1)\n"
     "  --cas 1|0           Use CAS writes for flatten, merge, rm (default is decide automatically)\n"
-    "  --no-color          Disable colored output\n"
+    "  --color 1|0         Enable/disable colored output and CR symbols (default 1 if stdout is a terminal)\n"
     "  --json              JSON output\n"
 ;
 
@@ -133,6 +185,7 @@ static json11::Json::object parse_args(int narg, const char *args[])
     cfg["progress"] = "1";
     for (int i = 1; i < narg; i++)
     {
+        bool argHasValue = (!(i == narg-1) && (args[i+1][0] != '-'));
         if (args[i][0] == '-' && args[i][1] == 'h' && args[i][2] == 0)
         {
             cfg["help"] = "1";
@@ -143,15 +196,15 @@ static json11::Json::object parse_args(int narg, const char *args[])
         }
         else if (args[i][0] == '-' && args[i][1] == 'n' && args[i][2] == 0)
         {
-            cfg["count"] = args[++i];
+            cfg["count"] = argHasValue ? args[++i] : "";
         }
         else if (args[i][0] == '-' && args[i][1] == 'p' && args[i][2] == 0)
         {
-            cfg["pool"] = args[++i];
+            cfg["pool"] = argHasValue ? args[++i] : "";
         }
         else if (args[i][0] == '-' && args[i][1] == 's' && args[i][2] == 0)
         {
-            cfg["size"] = args[++i];
+            cfg["size"] = argHasValue ? args[++i] : "";
         }
         else if (args[i][0] == '-' && args[i][1] == 'r' && args[i][2] == 0)
         {
@@ -164,17 +217,24 @@ static json11::Json::object parse_args(int narg, const char *args[])
         else if (args[i][0] == '-' && args[i][1] == '-')
         {
             const char *opt = args[i]+2;
-            cfg[opt] = i == narg-1 || !strcmp(opt, "json") ||
+            if (!strcmp(opt, "json") || !strcmp(opt, "wait") ||
                 !strcmp(opt, "wait-list") || !strcmp(opt, "wait_list") ||
-                !strcmp(opt, "long") || !strcmp(opt, "del") ||
+                !strcmp(opt, "long") || !strcmp(opt, "detail") || !strcmp(opt, "del") ||
                 !strcmp(opt, "no-color") || !strcmp(opt, "no_color") ||
                 !strcmp(opt, "readonly") || !strcmp(opt, "readwrite") ||
                 !strcmp(opt, "force") || !strcmp(opt, "reverse") ||
                 !strcmp(opt, "allow-data-loss") || !strcmp(opt, "allow_data_loss") ||
+                !strcmp(opt, "down-ok") || !strcmp(opt, "down_ok") ||
                 !strcmp(opt, "dry-run") || !strcmp(opt, "dry_run") ||
                 !strcmp(opt, "help") || !strcmp(opt, "all") ||
-                (!strcmp(opt, "writers-stopped") || !strcmp(opt, "writers_stopped")) && strcmp("1", args[i+1]) != 0
-                ? "1" : args[++i];
+                !strcmp(opt, "writers-stopped") || !strcmp(opt, "writers_stopped"))
+            {
+                cfg[opt] = "1";
+            }
+            else
+            {
+                cfg[opt] = argHasValue ? args[++i] : "";
+            }
         }
         else
         {
@@ -217,7 +277,7 @@ static int run(cli_tool_t *p, json11::Json::object cfg)
     else if (cmd[0] == "df")
     {
         // Show pool space stats
-        action_cb = p->start_df(cfg);
+        action_cb = p->start_pool_ls(cfg);
     }
     else if (cmd[0] == "ls")
     {
@@ -324,6 +384,44 @@ static int run(cli_tool_t *p, json11::Json::object cfg)
         // Allocate a new OSD number
         action_cb = p->start_alloc_osd(cfg);
     }
+    else if (cmd[0] == "create-pool" || cmd[0] == "pool-create")
+    {
+        // Create a new pool
+        if (cmd.size() > 1 && cfg["name"].is_null())
+        {
+            cfg["name"] = cmd[1];
+        }
+        action_cb = p->start_pool_create(cfg);
+    }
+    else if (cmd[0] == "modify-pool" || cmd[0] == "pool-modify")
+    {
+        // Modify existing pool
+        if (cmd.size() > 1)
+        {
+            cfg["old_name"] = cmd[1];
+        }
+        action_cb = p->start_pool_modify(cfg);
+    }
+    else if (cmd[0] == "rm-pool" || cmd[0] == "pool-rm")
+    {
+        // Remove existing pool
+        if (cmd.size() > 1)
+        {
+            cfg["pool"] = cmd[1];
+        }
+        action_cb = p->start_pool_rm(cfg);
+    }
+    else if (cmd[0] == "ls-pool" || cmd[0] == "pool-ls" || cmd[0] == "ls-pools" || cmd[0] == "pools")
+    {
+        // Show pool list
+        cfg["show_recovery"] = 1;
+        if (cmd.size() > 1)
+        {
+            cmd.erase(cmd.begin(), cmd.begin()+1);
+            cfg["names"] = cmd;
+        }
+        action_cb = p->start_pool_ls(cfg);
+    }
     else
     {
         result = { .err = EINVAL, .text = "unknown command: "+cmd[0].string_value() };

src/cli.h

@@ -46,6 +46,7 @@ public:
     json11::Json etcd_result;
 
     void parse_config(json11::Json::object & cfg);
+    json11::Json parse_tags(std::string tags);
 
     void change_parent(inode_t cur, inode_t new_parent, cli_result_t *result);
     inode_config_t* get_inode_cfg(const std::string & name);
@@ -58,7 +59,6 @@ public:
     std::function<bool(cli_result_t &)> start_status(json11::Json);
     std::function<bool(cli_result_t &)> start_describe(json11::Json);
     std::function<bool(cli_result_t &)> start_fix(json11::Json);
-    std::function<bool(cli_result_t &)> start_df(json11::Json);
     std::function<bool(cli_result_t &)> start_ls(json11::Json);
     std::function<bool(cli_result_t &)> start_create(json11::Json);
     std::function<bool(cli_result_t &)> start_modify(json11::Json);
@@ -68,6 +68,10 @@ public:
     std::function<bool(cli_result_t &)> start_rm(json11::Json);
     std::function<bool(cli_result_t &)> start_rm_osd(json11::Json cfg);
     std::function<bool(cli_result_t &)> start_alloc_osd(json11::Json cfg);
+    std::function<bool(cli_result_t &)> start_pool_create(json11::Json);
+    std::function<bool(cli_result_t &)> start_pool_modify(json11::Json);
+    std::function<bool(cli_result_t &)> start_pool_rm(json11::Json);
+    std::function<bool(cli_result_t &)> start_pool_ls(json11::Json);
 
     // Should be called like loop_and_wait(start_status(), <completion callback>)
     void loop_and_wait(std::function<bool(cli_result_t &)> loop_cb, std::function<void(const cli_result_t &)> complete_cb);
@@ -77,8 +81,13 @@ public:
 
 std::string print_table(json11::Json items, json11::Json header, bool use_esc);
 
+size_t print_detail_title_len(json11::Json item, std::vector<std::pair<std::string, std::string>> names, size_t prev_len);
+std::string print_detail(json11::Json item, std::vector<std::pair<std::string, std::string>> names, size_t title_len, bool use_esc);
+
 std::string format_lat(uint64_t lat);
 
 std::string format_q(double depth);
 
 bool stupid_glob(const std::string str, const std::string glob);
+
+std::string implode(const std::string & sep, json11::Json array);

src/cli_common.cpp

@@ -1,6 +1,7 @@
 // Copyright (c) Vitaliy Filippov, 2019+
 // License: VNPL-1.1 (see README.md for details)
 
+#include <unistd.h>
 #include "str_util.h"
 #include "cluster_client.h"
 #include "cli.h"
@@ -113,7 +114,12 @@ void cli_tool_t::parse_config(json11::Json::object & cfg)
         else
             kv_it++;
     }
-    color = !cfg["no_color"].bool_value();
+    if (cfg.find("no_color") != cfg.end())
+        color = !cfg["no_color"].bool_value();
+    else if (cfg.find("color") != cfg.end())
+        color = cfg["color"].bool_value();
+    else
+        color = isatty(1);
     json_output = cfg["json"].bool_value();
     iodepth = cfg["iodepth"].uint64_value();
     if (!iodepth)
@@ -147,6 +153,7 @@ void cli_tool_t::loop_and_wait(std::function<bool(cli_result_t &)> loop_cb, std:
             ringloop->unregister_consumer(&looper->consumer);
             looper->loop_cb = NULL;
             looper->complete_cb(looper->result);
+            ringloop->submit();
             delete looper;
             return;
         }

src/cli_create.cpp

@@ -27,6 +27,7 @@ struct image_creator_t
     std::string image_name, new_snap, new_parent;
     json11::Json new_meta;
     uint64_t size;
+    bool force = false;
     bool force_size = false;
 
     pool_id_t old_pool_id = 0;
@@ -45,6 +46,7 @@ struct image_creator_t
 
     void loop()
     {
+        auto & pools = parent->cli->st_cli.pool_config;
         if (state >= 1)
             goto resume_1;
         if (image_name == "")
@@ -62,7 +64,6 @@ struct image_creator_t
         }
         if (new_pool_id)
         {
-            auto & pools = parent->cli->st_cli.pool_config;
             if (pools.find(new_pool_id) == pools.end())
             {
                 result = (cli_result_t){ .err = ENOENT, .text = "Pool "+std::to_string(new_pool_id)+" does not exist" };
@@ -72,7 +73,7 @@ struct image_creator_t
         }
         else if (new_pool_name != "")
         {
-            for (auto & ic: parent->cli->st_cli.pool_config)
+            for (auto & ic: pools)
             {
                 if (ic.second.name == new_pool_name)
                 {
@@ -87,10 +88,20 @@ struct image_creator_t
                 return;
             }
         }
-        else if (parent->cli->st_cli.pool_config.size() == 1)
+        else if (pools.size() == 1)
         {
-            auto it = parent->cli->st_cli.pool_config.begin();
-            new_pool_id = it->first;
+            new_pool_id = pools.begin()->first;
+        }
+        if (new_pool_id && !pools.at(new_pool_id).used_for_fs.empty() && !force)
+        {
+            result = (cli_result_t){
+                .err = EINVAL,
+                .text = "Pool "+pools.at(new_pool_id).name+
+                    " is used for VitastorFS "+pools.at(new_pool_id).used_for_fs+
+                    ". Use --force if you really know what you are doing",
+            };
+            state = 100;
+            return;
         }
         state = 1;
     resume_1:
@@ -183,7 +194,16 @@ resume_3:
         // Save into inode_config for library users to be able to take it from there immediately
         new_cfg.mod_revision = parent->etcd_result["responses"][0]["response_put"]["header"]["revision"].uint64_value();
         parent->cli->st_cli.insert_inode_config(new_cfg);
-        result = (cli_result_t){ .err = 0, .text = "Image "+image_name+" created" };
+        result = (cli_result_t){
+            .err = 0,
+            .text = "Image "+image_name+" created",
+            .data = json11::Json::object {
+                { "name", image_name },
+                { "pool", new_pool_name },
+                { "parent", new_parent },
+                { "size", size },
+            }
+        };
         state = 100;
     }
 
@@ -251,7 +271,16 @@ resume_4:
         // Save into inode_config for library users to be able to take it from there immediately
         new_cfg.mod_revision = parent->etcd_result["responses"][0]["response_put"]["header"]["revision"].uint64_value();
         parent->cli->st_cli.insert_inode_config(new_cfg);
-        result = (cli_result_t){ .err = 0, .text = "Snapshot "+image_name+"@"+new_snap+" created" };
+        result = (cli_result_t){
+            .err = 0,
+            .text = "Snapshot "+image_name+"@"+new_snap+" created",
+            .data = json11::Json::object {
+                { "name", image_name+"@"+new_snap },
+                { "pool", (uint64_t)new_pool_id },
+                { "parent", new_parent },
+                { "size", size },
+            }
+        };
         state = 100;
     }
 
@@ -514,6 +543,7 @@ std::function<bool(cli_result_t &)> cli_tool_t::start_create(json11::Json cfg)
     image_creator->image_name = cfg["image"].string_value();
     image_creator->new_pool_id = cfg["pool"].uint64_value();
     image_creator->new_pool_name = cfg["pool"].string_value();
+    image_creator->force = cfg["force"].bool_value();
     image_creator->force_size = cfg["force_size"].bool_value();
     if (cfg["image_meta"].is_object())
     {

src/cli_df.cpp

@@ -1,243 +0,0 @@
-// Copyright (c) Vitaliy Filippov, 2019+
-// License: VNPL-1.1 (see README.md for details)
-
-#include "cli.h"
-#include "cluster_client.h"
-#include "str_util.h"
-
-// List pools with space statistics
-struct pool_lister_t
-{
-    cli_tool_t *parent;
-
-    int state = 0;
-    json11::Json space_info;
-    cli_result_t result;
-    std::map<pool_id_t, json11::Json::object> pool_stats;
-
-    bool is_done()
-    {
-        return state == 100;
-    }
-
-    void get_stats()
-    {
-        if (state == 1)
-            goto resume_1;
-        // Space statistics - pool/stats/<pool>
-        parent->etcd_txn(json11::Json::object {
-            { "success", json11::Json::array {
-                json11::Json::object {
-                    { "request_range", json11::Json::object {
-                        { "key", base64_encode(
-                            parent->cli->st_cli.etcd_prefix+"/pool/stats/"
-                        ) },
-                        { "range_end", base64_encode(
-                            parent->cli->st_cli.etcd_prefix+"/pool/stats0"
-                        ) },
-                    } },
-                },
-                json11::Json::object {
-                    { "request_range", json11::Json::object {
-                        { "key", base64_encode(
-                            parent->cli->st_cli.etcd_prefix+"/osd/stats/"
-                        ) },
-                        { "range_end", base64_encode(
-                            parent->cli->st_cli.etcd_prefix+"/osd/stats0"
-                        ) },
-                    } },
-                },
-            } },
-        });
-        state = 1;
-resume_1:
-        if (parent->waiting > 0)
-            return;
-        if (parent->etcd_err.err)
-        {
-            result = parent->etcd_err;
-            state = 100;
-            return;
-        }
-        space_info = parent->etcd_result;
-        std::map<pool_id_t, uint64_t> osd_free;
-        for (auto & kv_item: space_info["responses"][0]["response_range"]["kvs"].array_items())
-        {
-            auto kv = parent->cli->st_cli.parse_etcd_kv(kv_item);
-            // pool ID
-            pool_id_t pool_id;
-            char null_byte = 0;
-            int scanned = sscanf(kv.key.substr(parent->cli->st_cli.etcd_prefix.length()).c_str(), "/pool/stats/%u%c", &pool_id, &null_byte);
-            if (scanned != 1 || !pool_id || pool_id >= POOL_ID_MAX)
-            {
-                fprintf(stderr, "Invalid key in etcd: %s\n", kv.key.c_str());
-                continue;
-            }
-            // pool/stats/<N>
-            pool_stats[pool_id] = kv.value.object_items();
-        }
-        for (auto & kv_item: space_info["responses"][1]["response_range"]["kvs"].array_items())
-        {
-            auto kv = parent->cli->st_cli.parse_etcd_kv(kv_item);
-            // osd ID
-            osd_num_t osd_num;
-            char null_byte = 0;
-            int scanned = sscanf(kv.key.substr(parent->cli->st_cli.etcd_prefix.length()).c_str(), "/osd/stats/%ju%c", &osd_num, &null_byte);
-            if (scanned != 1 || !osd_num || osd_num >= POOL_ID_MAX)
-            {
-                fprintf(stderr, "Invalid key in etcd: %s\n", kv.key.c_str());
-                continue;
-            }
-            // osd/stats/<N>::free
-            osd_free[osd_num] = kv.value["free"].uint64_value();
-        }
-        // Calculate max_avail for each pool
-        for (auto & pp: parent->cli->st_cli.pool_config)
-        {
-            auto & pool_cfg = pp.second;
-            uint64_t pool_avail = UINT64_MAX;
-            std::map<osd_num_t, uint64_t> pg_per_osd;
-            for (auto & pgp: pool_cfg.pg_config)
-            {
-                for (auto pg_osd: pgp.second.target_set)
-                {
-                    if (pg_osd != 0)
-                    {
-                        pg_per_osd[pg_osd]++;
-                    }
-                }
-            }
-            for (auto pg_per_pair: pg_per_osd)
-            {
-                uint64_t pg_free = osd_free[pg_per_pair.first] * pool_cfg.real_pg_count / pg_per_pair.second;
-                if (pool_avail > pg_free)
-                {
-                    pool_avail = pg_free;
-                }
-            }
-            if (pool_avail == UINT64_MAX)
-            {
-                pool_avail = 0;
-            }
-            if (pool_cfg.scheme != POOL_SCHEME_REPLICATED)
-            {
-                pool_avail *= (pool_cfg.pg_size - pool_cfg.parity_chunks);
-            }
-            pool_stats[pool_cfg.id] = json11::Json::object {
-                { "id", (uint64_t)pool_cfg.id },
-                { "name", pool_cfg.name },
-                { "pg_count", pool_cfg.pg_count },
-                { "real_pg_count", pool_cfg.real_pg_count },
-                { "scheme", pool_cfg.scheme == POOL_SCHEME_REPLICATED ? "replicated" : "ec" },
-                { "scheme_name", pool_cfg.scheme == POOL_SCHEME_REPLICATED
-                    ? std::to_string(pool_cfg.pg_size)+"/"+std::to_string(pool_cfg.pg_minsize)
-                    : "EC "+std::to_string(pool_cfg.pg_size-pool_cfg.parity_chunks)+"+"+std::to_string(pool_cfg.parity_chunks) },
-                { "used_raw", (uint64_t)(pool_stats[pool_cfg.id]["used_raw_tb"].number_value() * ((uint64_t)1<<40)) },
-                { "total_raw", (uint64_t)(pool_stats[pool_cfg.id]["total_raw_tb"].number_value() * ((uint64_t)1<<40)) },
-                { "max_available", pool_avail },
-                { "raw_to_usable", pool_stats[pool_cfg.id]["raw_to_usable"].number_value() },
-                { "space_efficiency", pool_stats[pool_cfg.id]["space_efficiency"].number_value() },
-                { "pg_real_size", pool_stats[pool_cfg.id]["pg_real_size"].uint64_value() },
-                { "failure_domain", pool_cfg.failure_domain },
-            };
-        }
-    }
-
-    json11::Json::array to_list()
-    {
-        json11::Json::array list;
-        for (auto & kv: pool_stats)
-        {
-            list.push_back(kv.second);
-        }
-        return list;
-    }
-
-    void loop()
-    {
-        get_stats();
-        if (parent->waiting > 0)
-            return;
-        if (state == 100)
-            return;
-        if (parent->json_output)
-        {
-            // JSON output
-            result.data = to_list();
-            state = 100;
-            return;
-        }
-        // Table output: name, scheme_name, pg_count, total, used, max_avail, used%, efficiency
-        json11::Json::array cols;
-        cols.push_back(json11::Json::object{
-            { "key", "name" },
-            { "title", "NAME" },
-        });
-        cols.push_back(json11::Json::object{
-            { "key", "scheme_name" },
-            { "title", "SCHEME" },
-        });
-        cols.push_back(json11::Json::object{
-            { "key", "pg_count_fmt" },
-            { "title", "PGS" },
-        });
-        cols.push_back(json11::Json::object{
-            { "key", "total_fmt" },
-            { "title", "TOTAL" },
-        });
-        cols.push_back(json11::Json::object{
-            { "key", "used_fmt" },
-            { "title", "USED" },
-        });
-        cols.push_back(json11::Json::object{
-            { "key", "max_avail_fmt" },
-            { "title", "AVAILABLE" },
-        });
-        cols.push_back(json11::Json::object{
-            { "key", "used_pct" },
-            { "title", "USED%" },
-        });
-        cols.push_back(json11::Json::object{
-            { "key", "eff_fmt" },
-            { "title", "EFFICIENCY" },
-        });
-        json11::Json::array list;
-        for (auto & kv: pool_stats)
-        {
-            double raw_to = kv.second["raw_to_usable"].number_value();
-            if (raw_to < 0.000001 && raw_to > -0.000001)
-                raw_to = 1;
-            kv.second["pg_count_fmt"] = kv.second["real_pg_count"] == kv.second["pg_count"]
-                ? kv.second["real_pg_count"].as_string()
-                : kv.second["real_pg_count"].as_string()+"->"+kv.second["pg_count"].as_string();
-            kv.second["total_fmt"] = format_size(kv.second["total_raw"].uint64_value() / raw_to);
-            kv.second["used_fmt"] = format_size(kv.second["used_raw"].uint64_value() / raw_to);
-            kv.second["max_avail_fmt"] = format_size(kv.second["max_available"].uint64_value());
-            kv.second["used_pct"] = format_q(kv.second["total_raw"].uint64_value()
-                ? (100 - 100*kv.second["max_available"].uint64_value() *
-                    kv.second["raw_to_usable"].number_value() / kv.second["total_raw"].uint64_value())
-                : 100)+"%";
-            kv.second["eff_fmt"] = format_q(kv.second["space_efficiency"].number_value()*100)+"%";
-        }
-        result.data = to_list();
-        result.text = print_table(result.data, cols, parent->color);
-        state = 100;
-    }
-};
-
-std::function<bool(cli_result_t &)> cli_tool_t::start_df(json11::Json cfg)
-{
-    auto lister = new pool_lister_t();
-    lister->parent = this;
-    return [lister](cli_result_t & result)
-    {
-        lister->loop();
-        if (lister->is_done())
-        {
-            result = lister->result;
-            delete lister;
-            return true;
-        }
-        return false;
-    };
-}

src/cli_merge.cpp

@@ -275,7 +275,9 @@ struct snap_merger_t
                 processed++;
                 if (parent->progress && !(processed % 128))
                 {
-                    printf("\rFiltering target blocks: %ju/%ju", processed, to_process);
+                    fprintf(stderr, parent->color
+                        ? "\rFiltering target blocks: %ju/%ju"
+                        : "Filtering target blocks: %ju/%ju\n", processed, to_process);
                 }
             }
             if (in_flight > 0 || oit != merge_offsets.end())
@@ -285,7 +287,9 @@ struct snap_merger_t
             }
             if (parent->progress)
             {
-                printf("\r%ju full blocks of target filtered out\n", to_process-merge_offsets.size());
+                fprintf(stderr, parent->color
+                    ? "\r%ju full blocks of target filtered out\n"
+                    : "%ju full blocks of target filtered out\n", to_process-merge_offsets.size());
             }
         }
         state = 3;
@@ -320,7 +324,9 @@ struct snap_merger_t
             processed++;
             if (parent->progress && !(processed % 128))
             {
-                printf("\rOverwriting blocks: %ju/%ju", processed, to_process);
+                fprintf(stderr, parent->color
+                    ? "\rOverwriting blocks: %ju/%ju"
+                    : "Overwriting blocks: %ju/%ju\n", processed, to_process);
             }
         }
         if (in_flight == 0 && rwo_error.size())
@@ -339,10 +345,16 @@ struct snap_merger_t
         }
         if (parent->progress)
         {
-            printf("\rOverwriting blocks: %ju/%ju\n", to_process, to_process);
+            fprintf(stderr, parent->color
+                ? "\rOverwriting blocks: %ju/%ju\n"
+                : "Overwriting blocks: %ju/%ju\n", to_process, to_process);
         }
         // Done
-        result = (cli_result_t){ .text = "Done, layers from "+from_name+" to "+to_name+" merged into "+target_name };
+        result = (cli_result_t){ .text = "Done, layers from "+from_name+" to "+to_name+" merged into "+target_name, .data = json11::Json::object {
+            { "from", from_name },
+            { "to", to_name },
+            { "into", target_name },
+        }};
         state = 100;
     resume_100:
         return;

src/cli_modify.cpp

@@ -15,6 +15,7 @@ struct image_changer_t
     uint64_t new_size = 0;
     bool force_size = false, inc_size = false;
     bool set_readonly = false, set_readwrite = false, force = false;
+    bool down_ok = false;
     // interval between fsyncs
     int fsync_interval = 128;
 
@@ -84,7 +85,10 @@ struct image_changer_t
             (!new_size && !force_size || cfg.size == new_size || cfg.size >= new_size && inc_size) &&
             (new_name == "" || new_name == image_name))
         {
-            result = (cli_result_t){ .text = "No change" };
+            result = (cli_result_t){ .err = 0, .text = "No change", .data = json11::Json::object {
+                { "error_code", 0 },
+                { "error_text", "No change" },
+            }};
             state = 100;
             return;
         }
@@ -105,6 +109,7 @@ struct image_changer_t
                     { "pool", (uint64_t)INODE_POOL(inode_num) },
                     { "fsync-interval", fsync_interval },
                     { "min-offset", ((new_size+4095)/4096)*4096 },
+                    { "down-ok", down_ok },
                 });
 resume_1:
                 while (!cb(result))
@@ -220,7 +225,16 @@ resume_2:
             parent->cli->st_cli.inode_by_name.erase(image_name);
         }
         parent->cli->st_cli.insert_inode_config(cfg);
-        result = (cli_result_t){ .err = 0, .text = "Image "+image_name+" modified" };
+        result = (cli_result_t){
+            .err = 0,
+            .text = "Image "+image_name+" modified",
+            .data = json11::Json::object {
+                { "name", image_name },
+                { "inode", INODE_NO_POOL(inode_num) },
+                { "pool", (uint64_t)INODE_POOL(inode_num) },
+                { "size", new_size },
+            }
+        };
         state = 100;
     }
 };
@@ -240,6 +254,7 @@ std::function<bool(cli_result_t &)> cli_tool_t::start_modify(json11::Json cfg)
     changer->fsync_interval = cfg["fsync_interval"].uint64_value();
     if (!changer->fsync_interval)
         changer->fsync_interval = 128;
+    changer->down_ok = cfg["down_ok"].bool_value();
     // FIXME Check that the image doesn't have children when shrinking
     return [changer](cli_result_t & result)
     {

src/cli_pool_cfg.cpp

@@ -0,0 +1,270 @@
+// Copyright (c) Vitaliy Filippov, 2024
+// License: VNPL-1.1 (see README.md for details)
+
+#include "cli_pool_cfg.h"
+#include "etcd_state_client.h"
+#include "str_util.h"
+
+std::string validate_pool_config(json11::Json::object & new_cfg, json11::Json old_cfg,
+    uint64_t global_block_size, uint64_t global_bitmap_granularity, bool force)
+{
+    // short option names
+    if (new_cfg.find("count") != new_cfg.end())
+    {
+        new_cfg["pg_count"] = new_cfg["count"];
+        new_cfg.erase("count");
+    }
+    if (new_cfg.find("size") != new_cfg.end())
+    {
+        new_cfg["pg_size"] = new_cfg["size"];
+        new_cfg.erase("size");
+    }
+
+    // --ec shortcut
+    if (new_cfg.find("ec") != new_cfg.end())
+    {
+        if (new_cfg.find("scheme") != new_cfg.end() ||
+            new_cfg.find("pg_size") != new_cfg.end() ||
+            new_cfg.find("parity_chunks") != new_cfg.end())
+        {
+            return "--ec can't be used with --pg_size, --parity_chunks or --scheme";
+        }
+        // pg_size = N+K
+        // parity_chunks = K
+        uint64_t data_chunks = 0, parity_chunks = 0;
+        char null_byte = 0;
+        int ret = sscanf(new_cfg["ec"].string_value().c_str(), "%ju+%ju%c", &data_chunks, &parity_chunks, &null_byte);
+        if (ret != 2 || !data_chunks || !parity_chunks)
+        {
+            return "--ec should be <N>+<K> format (<N>, <K> - numbers)";
+        }
+        new_cfg.erase("ec");
+        new_cfg["scheme"] = "ec";
+        new_cfg["pg_size"] = data_chunks+parity_chunks;
+        new_cfg["parity_chunks"] = parity_chunks;
+    }
+
+    if (old_cfg.is_null() && new_cfg["scheme"].string_value() == "")
+    {
+        // Default scheme
+        new_cfg["scheme"] = "replicated";
+    }
+    if (new_cfg.find("pg_minsize") == new_cfg.end() && (old_cfg.is_null() || new_cfg.find("pg_size") != new_cfg.end()))
+    {
+        // Default pg_minsize
+        if (new_cfg["scheme"] == "replicated")
+        {
+            // pg_minsize = (N+K > 2) ? 2 : 1
+            new_cfg["pg_minsize"] = new_cfg["pg_size"].uint64_value() > 2 ? 2 : 1;
+        }
+        else // ec or xor
+        {
+            // pg_minsize = (K > 1) ? N + 1 : N
+            new_cfg["pg_minsize"] = new_cfg["pg_size"].uint64_value() - new_cfg["parity_chunks"].uint64_value() +
+                (new_cfg["parity_chunks"].uint64_value() > 1 ? 1 : 0);
+        }
+    }
+
+    // Check integer values and unknown keys
+    for (auto kv_it = new_cfg.begin(); kv_it != new_cfg.end(); )
+    {
+        auto & key = kv_it->first;
+        auto & value = kv_it->second;
+        if (key == "pg_size" || key == "parity_chunks" || key == "pg_minsize" ||
+            key == "pg_count" || key == "max_osd_combinations" || key == "block_size" ||
+            key == "bitmap_granularity" || key == "pg_stripe_size")
+        {
+            if (value.is_number() && value.uint64_value() != value.number_value() ||
+                value.is_string() && !value.uint64_value() && value.string_value() != "0")
+            {
+                return key+" must be a non-negative integer";
+            }
+            value = value.uint64_value();
+        }
+        else if (key == "name" || key == "scheme" || key == "immediate_commit" ||
+            key == "failure_domain" || key == "root_node" || key == "scrub_interval" || key == "used_for_fs")
+        {
+            // OK
+        }
+        else if (key == "osd_tags" || key == "primary_affinity_tags")
+        {
+            if (value.is_string())
+            {
+                value = explode(",", value.string_value(), true);
+            }
+        }
+        else
+        {
+            // Unknown parameter
+            new_cfg.erase(kv_it++);
+            continue;
+        }
+        kv_it++;
+    }
+
+    // Merge with the old config
+    if (!old_cfg.is_null())
+    {
+        for (auto & kv: old_cfg.object_items())
+        {
+            if (new_cfg.find(kv.first) == new_cfg.end())
+            {
+                new_cfg[kv.first] = kv.second;
+            }
+        }
+    }
+
+    // Check after merging
+    if (new_cfg["scheme"] != "ec")
+    {
+        new_cfg.erase("parity_chunks");
+    }
+    if (new_cfg.find("used_for_fs") != new_cfg.end() && new_cfg["used_for_fs"].string_value() == "")
+    {
+        new_cfg.erase("used_for_fs");
+    }
+
+    // Prevent autovivification of object keys. Now we don't modify the config, we just check it
+    json11::Json cfg = new_cfg;
+
+    // Validate changes
+    if (!old_cfg.is_null() && !force)
+    {
+        if (old_cfg["scheme"] != cfg["scheme"])
+        {
+            return "Changing scheme for an existing pool will lead to data loss. Use --force to proceed";
+        }
+        if (etcd_state_client_t::parse_scheme(old_cfg["scheme"].string_value()) == POOL_SCHEME_EC)
+        {
+            uint64_t old_data_chunks = old_cfg["pg_size"].uint64_value() - old_cfg["parity_chunks"].uint64_value();
+            uint64_t new_data_chunks = cfg["pg_size"].uint64_value() - cfg["parity_chunks"].uint64_value();
+            if (old_data_chunks != new_data_chunks)
+            {
+                return "Changing EC data chunk count for an existing pool will lead to data loss. Use --force to proceed";
+            }
+        }
+        if (old_cfg["block_size"] != cfg["block_size"] ||
+            old_cfg["bitmap_granularity"] != cfg["bitmap_granularity"] ||
+            old_cfg["immediate_commit"] != cfg["immediate_commit"])
+        {
+            return "Changing block_size, bitmap_granularity or immediate_commit"
+                " for an existing pool will lead to incomplete PGs. Use --force to proceed";
+        }
+        if (old_cfg["pg_stripe_size"] != cfg["pg_stripe_size"])
+        {
+            return "Changing pg_stripe_size for an existing pool will lead to data loss. Use --force to proceed";
+        }
+    }
+
+    // Validate values
+    if (cfg["name"].string_value() == "")
+    {
+        return "Non-empty pool name is required";
+    }
+
+    // scheme
+    auto scheme = etcd_state_client_t::parse_scheme(cfg["scheme"].string_value());
+    if (!scheme)
+    {
+        return "Scheme must be one of \"replicated\", \"ec\" or \"xor\"";
+    }
+
+    // pg_size
+    auto pg_size = cfg["pg_size"].uint64_value();
+    if (!pg_size)
+    {
+        return "Non-zero PG size is required";
+    }
+    if (scheme != POOL_SCHEME_REPLICATED && pg_size < 3)
+    {
+        return "PG size can't be smaller than 3 for EC/XOR pools";
+    }
+    if (pg_size > 256)
+    {
+        return "PG size can't be greater than 256";
+    }
+
+    // parity_chunks
+    uint64_t parity_chunks = 1;
+    if (scheme == POOL_SCHEME_EC)
+    {
+        parity_chunks = cfg["parity_chunks"].uint64_value();
+        if (!parity_chunks)
+        {
+            return "Non-zero parity_chunks is required";
+        }
+        if (parity_chunks > pg_size-2)
+        {
+            return "parity_chunks can't be greater than "+std::to_string(pg_size-2)+" (PG size - 2)";
+        }
+    }
+
+    // pg_minsize
+    auto pg_minsize = cfg["pg_minsize"].uint64_value();
+    if (!pg_minsize)
+    {
+        return "Non-zero pg_minsize is required";
+    }
+    else if (pg_minsize > pg_size)
+    {
+        return "pg_minsize can't be greater than "+std::to_string(pg_size)+" (PG size)";
+    }
+    else if (scheme != POOL_SCHEME_REPLICATED && pg_minsize < pg_size-parity_chunks)
+    {
+        return "pg_minsize can't be smaller than "+std::to_string(pg_size-parity_chunks)+
+            " (pg_size - parity_chunks) for XOR/EC pool";
+    }
+
+    // pg_count
+    if (!cfg["pg_count"].uint64_value())
+    {
+        return "Non-zero pg_count is required";
+    }
+
+    // max_osd_combinations
+    if (!cfg["max_osd_combinations"].is_null() && cfg["max_osd_combinations"].uint64_value() < 100)
+    {
+        return "max_osd_combinations must be at least 100, but it is "+cfg["max_osd_combinations"].as_string();
+    }
+
+    // block_size
+    auto block_size = cfg["block_size"].uint64_value();
+    if (!cfg["block_size"].is_null() && ((block_size & (block_size-1)) ||
+        block_size < MIN_DATA_BLOCK_SIZE || block_size > MAX_DATA_BLOCK_SIZE))
+    {
+        return "block_size must be a power of two between "+std::to_string(MIN_DATA_BLOCK_SIZE)+
+            " and "+std::to_string(MAX_DATA_BLOCK_SIZE)+", but it is "+std::to_string(block_size);
+    }
+    block_size = (block_size ? block_size : global_block_size);
+
+    // bitmap_granularity
+    auto bitmap_granularity = cfg["bitmap_granularity"].uint64_value();
+    if (!cfg["bitmap_granularity"].is_null() && (!bitmap_granularity || (bitmap_granularity % 512)))
+    {
+        return "bitmap_granularity must be a multiple of 512, but it is "+std::to_string(bitmap_granularity);
+    }
+    bitmap_granularity = (bitmap_granularity ? bitmap_granularity : global_bitmap_granularity);
+    if (block_size % bitmap_granularity)
+    {
+        return "bitmap_granularity must divide data block size ("+std::to_string(block_size)+"), but it is "+std::to_string(bitmap_granularity);
+    }
+
+    // immediate_commit
+    if (!cfg["immediate_commit"].is_null() && !etcd_state_client_t::parse_immediate_commit(cfg["immediate_commit"].string_value()))
+    {
+        return "immediate_commit must be one of \"all\", \"small\", or \"none\", but it is "+cfg["immediate_commit"].as_string();
+    }
+
+    // scrub_interval
+    if (!cfg["scrub_interval"].is_null())
+    {
+        bool ok;
+        parse_time(cfg["scrub_interval"].string_value(), &ok);
+        if (!ok)
+        {
+            return "scrub_interval must be a time interval (number + unit s/m/h/d/M/y), but it is "+cfg["scrub_interval"].as_string();
+        }
+    }
+
+    return "";
+}

src/cli_pool_cfg.h

@@ -0,0 +1,10 @@
+// Copyright (c) Vitaliy Filippov, 2024
+// License: VNPL-1.1 (see README.md for details)
+
+#pragma once
+
+#include "json11/json11.hpp"
+#include <stdint.h>
+
+std::string validate_pool_config(json11::Json::object & new_cfg, json11::Json old_cfg,
+    uint64_t global_block_size, uint64_t global_bitmap_granularity, bool force);

src/cli_pool_create.cpp

@@ -0,0 +1,622 @@
+// Copyright (c) MIND Software LLC, 2023 (info@mindsw.io)
+// I accept Vitastor CLA: see CLA-en.md for details
+// Copyright (c) Vitaliy Filippov, 2024
+// License: VNPL-1.1 (see README.md for details)
+
+#include <ctype.h>
+#include "cli.h"
+#include "cli_pool_cfg.h"
+#include "cluster_client.h"
+#include "epoll_manager.h"
+#include "pg_states.h"
+#include "str_util.h"
+
+struct pool_creator_t
+{
+    cli_tool_t *parent;
+    json11::Json::object cfg;
+
+    bool force = false;
+    bool wait = false;
+
+    int state = 0;
+    cli_result_t result;
+
+    struct {
+        uint32_t retries = 5;
+        uint32_t interval = 0;
+        bool passed = false;
+    } create_check;
+
+    uint64_t new_id = 1;
+    uint64_t new_pools_mod_rev;
+    json11::Json state_node_tree;
+    json11::Json new_pools;
+
+    bool is_done() { return state == 100; }
+
+    void loop()
+    {
+        if (state == 1)
+            goto resume_1;
+        else if (state == 2)
+            goto resume_2;
+        else if (state == 3)
+            goto resume_3;
+        else if (state == 4)
+            goto resume_4;
+        else if (state == 5)
+            goto resume_5;
+        else if (state == 6)
+            goto resume_6;
+        else if (state == 7)
+            goto resume_7;
+        else if (state == 8)
+            goto resume_8;
+
+        // Validate pool parameters
+        result.text = validate_pool_config(cfg, json11::Json(), parent->cli->st_cli.global_block_size,
+            parent->cli->st_cli.global_bitmap_granularity, force);
+        if (result.text != "")
+        {
+            result.err = EINVAL;
+            state = 100;
+            return;
+        }
+        state = 1;
+resume_1:
+        // If not forced, check that we have enough osds for pg_size
+        if (!force)
+        {
+            // Get node_placement configuration from etcd
+            parent->etcd_txn(json11::Json::object {
+                { "success", json11::Json::array {
+                    json11::Json::object {
+                        { "request_range", json11::Json::object {
+                            { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/config/node_placement") },
+                        } }
+                    },
+                } },
+            });
+
+            state = 2;
+resume_2:
+            if (parent->waiting > 0)
+                return;
+            if (parent->etcd_err.err)
+            {
+                result = parent->etcd_err;
+                state = 100;
+                return;
+            }
+
+            // Get state_node_tree based on node_placement and osd peer states
+            {
+                auto kv = parent->cli->st_cli.parse_etcd_kv(parent->etcd_result["responses"][0]["response_range"]["kvs"][0]);
+                state_node_tree = get_state_node_tree(kv.value.object_items());
+            }
+
+            // Skip tag checks, if pool has none
+            if (cfg["osd_tags"].array_items().size())
+            {
+                // Get osd configs (for tags) of osds in state_node_tree
+                {
+                    json11::Json::array osd_configs;
+                    for (auto osd_num: state_node_tree["osds"].array_items())
+                    {
+                        osd_configs.push_back(json11::Json::object {
+                            { "request_range", json11::Json::object {
+                                { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/config/osd/"+osd_num.as_string()) },
+                            } }
+                        });
+                    }
+                    parent->etcd_txn(json11::Json::object { { "success", osd_configs, }, });
+                }
+
+                state = 3;
+resume_3:
+                if (parent->waiting > 0)
+                    return;
+                if (parent->etcd_err.err)
+                {
+                    result = parent->etcd_err;
+                    state = 100;
+                    return;
+                }
+
+                // Filter out osds from state_node_tree based on pool/osd tags
+                {
+                    std::vector<json11::Json> osd_configs;
+                    for (auto & ocr: parent->etcd_result["responses"].array_items())
+                    {
+                        auto kv = parent->cli->st_cli.parse_etcd_kv(ocr["response_range"]["kvs"][0]);
+                        osd_configs.push_back(kv.value);
+                    }
+                    state_node_tree = filter_state_node_tree_by_tags(state_node_tree, osd_configs);
+                }
+            }
+
+            // Get stats (for block_size, bitmap_granularity, ...) of osds in state_node_tree
+            {
+                json11::Json::array osd_stats;
+
+                for (auto osd_num: state_node_tree["osds"].array_items())
+                {
+                    osd_stats.push_back(json11::Json::object {
+                        { "request_range", json11::Json::object {
+                            { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/osd/stats/"+osd_num.as_string()) },
+                        } }
+                    });
+                }
+
+                parent->etcd_txn(json11::Json::object { { "success", osd_stats, }, });
+            }
+
+            state = 4;
+resume_4:
+            if (parent->waiting > 0)
+                return;
+            if (parent->etcd_err.err)
+            {
+                result = parent->etcd_err;
+                state = 100;
+                return;
+            }
+
+            // Filter osds from state_node_tree based on pool parameters and osd stats
+            {
+                std::vector<json11::Json> osd_stats;
+                for (auto & ocr: parent->etcd_result["responses"].array_items())
+                {
+                    auto kv = parent->cli->st_cli.parse_etcd_kv(ocr["response_range"]["kvs"][0]);
+                    osd_stats.push_back(kv.value);
+                }
+                state_node_tree = filter_state_node_tree_by_stats(state_node_tree, osd_stats);
+            }
+
+            // Check that pg_size <= max_pg_size
+            {
+                auto failure_domain = cfg["failure_domain"].string_value() == ""
+                    ? "host" : cfg["failure_domain"].string_value();
+                uint64_t max_pg_size = get_max_pg_size(state_node_tree["nodes"].object_items(),
+                    failure_domain, cfg["root_node"].string_value());
+
+                if (cfg["pg_size"].uint64_value() > max_pg_size)
+                {
+                    result = (cli_result_t){
+                        .err = EINVAL,
+                        .text =
+                            "There are "+std::to_string(max_pg_size)+" \""+failure_domain+"\" failure domains with OSDs matching tags and"
+                            " block_size/bitmap_granularity/immediate_commit parameters, but you want to create a"
+                            " pool with "+cfg["pg_size"].as_string()+" OSDs from different failure domains in a PG."
+                            " Change parameters or add --force if you want to create a degraded pool and add OSDs later."
+                    };
+                    state = 100;
+                    return;
+                }
+            }
+        }
+        // Create pool
+        state = 5;
+resume_5:
+        // Get pools from etcd
+        parent->etcd_txn(json11::Json::object {
+            { "success", json11::Json::array {
+                json11::Json::object {
+                    { "request_range", json11::Json::object {
+                        { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/config/pools") },
+                    } }
+                },
+            } },
+        });
+        state = 6;
+resume_6:
+        if (parent->waiting > 0)
+            return;
+        if (parent->etcd_err.err)
+        {
+            result = parent->etcd_err;
+            state = 100;
+            return;
+        }
+        {
+            // Add new pool
+            auto kv = parent->cli->st_cli.parse_etcd_kv(parent->etcd_result["responses"][0]["response_range"]["kvs"][0]);
+            new_pools = create_pool(kv);
+            if (new_pools.is_string())
+            {
+                result = (cli_result_t){ .err = EEXIST, .text = new_pools.string_value() };
+                state = 100;
+                return;
+            }
+            new_pools_mod_rev = kv.mod_revision;
+        }
+        // Update pools in etcd
+        parent->etcd_txn(json11::Json::object {
+            { "compare", json11::Json::array {
+                json11::Json::object {
+                    { "target", "MOD" },
+                    { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/config/pools") },
+                    { "result", "LESS" },
+                    { "mod_revision", new_pools_mod_rev+1 },
+                }
+            } },
+            { "success", json11::Json::array {
+                json11::Json::object {
+                    { "request_put", json11::Json::object {
+                        { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/config/pools") },
+                        { "value", base64_encode(new_pools.dump()) },
+                    } },
+                },
+            } },
+        });
+        state = 7;
+resume_7:
+        if (parent->waiting > 0)
+            return;
+        if (parent->etcd_err.err)
+        {
+            result = parent->etcd_err;
+            state = 100;
+            return;
+        }
+
+        // Perform final create-check
+        create_check.interval = parent->cli->config["mon_change_timeout"].uint64_value();
+        if (!create_check.interval)
+            create_check.interval = 1000;
+
+        state = 8;
+resume_8:
+        if (parent->waiting > 0)
+            return;
+
+        // Unless forced, check that pool was created and is active
+        if (!wait)
+        {
+            create_check.passed = true;
+        }
+        else if (create_check.retries)
+        {
+            create_check.retries--;
+            parent->waiting++;
+            parent->epmgr->tfd->set_timer(create_check.interval, false, [this](int timer_id)
+            {
+                if (parent->cli->st_cli.pool_config.find(new_id) != parent->cli->st_cli.pool_config.end())
+                {
+                    auto & pool_cfg = parent->cli->st_cli.pool_config[new_id];
+                    create_check.passed = pool_cfg.real_pg_count > 0;
+                    for (auto pg_it = pool_cfg.pg_config.begin(); pg_it != pool_cfg.pg_config.end(); pg_it++)
+                    {
+                        if (!(pg_it->second.cur_state & PG_ACTIVE))
+                        {
+                            create_check.passed = false;
+                            break;
+                        }
+                    }
+                    if (create_check.passed)
+                        create_check.retries = 0;
+                }
+                parent->waiting--;
+                parent->ringloop->wakeup();
+            });
+            return;
+        }
+
+        if (!create_check.passed)
+        {
+            result = (cli_result_t) {
+                .err = EAGAIN,
+                .text = "Pool "+cfg["name"].string_value()+" was created, but failed to become active."
+                    " This may indicate that cluster state has changed while the pool was being created."
+                    " Please check the current state and adjust the pool configuration if necessary.",
+            };
+        }
+        else
+        {
+            result = (cli_result_t){
+                .err = 0,
+                .text = "Pool "+cfg["name"].string_value()+" created",
+                .data = new_pools[std::to_string(new_id)],
+            };
+        }
+        state = 100;
+    }
+
+    // Returns a JSON object of form {"nodes": {...}, "osds": [...]} that
+    // contains: all nodes (osds, hosts, ...) based on node_placement config
+    // and current peer state, and a list of active peer osds.
+    json11::Json get_state_node_tree(json11::Json::object node_placement)
+    {
+        // Erase non-peer osd nodes from node_placement
+        for (auto np_it = node_placement.begin(); np_it != node_placement.end();)
+        {
+            // Numeric nodes are osds
+            osd_num_t osd_num = stoull_full(np_it->first);
+
+            // If node is osd and it is not in peer states, erase it
+            if (osd_num > 0 &&
+                parent->cli->st_cli.peer_states.find(osd_num) == parent->cli->st_cli.peer_states.end())
+            {
+                node_placement.erase(np_it++);
+            }
+            else
+                np_it++;
+        }
+
+        // List of peer osds
+        std::vector<std::string> peer_osds;
+
+        // Record peer osds and add missing osds/hosts to np
+        for (auto & ps: parent->cli->st_cli.peer_states)
+        {
+            std::string osd_num = std::to_string(ps.first);
+
+            // Record peer osd
+            peer_osds.push_back(osd_num);
+
+            // Add osd, if necessary
+            if (node_placement.find(osd_num) == node_placement.end())
+            {
+                std::string osd_host = ps.second["host"].as_string();
+
+                // Add host, if necessary
+                if (node_placement.find(osd_host) == node_placement.end())
+                {
+                    node_placement[osd_host] = json11::Json::object {
+                        { "level", "host" }
+                    };
+                }
+
+                node_placement[osd_num] = json11::Json::object {
+                    { "parent", osd_host }
+                };
+            }
+        }
+
+        return json11::Json::object { { "osds", peer_osds }, { "nodes", node_placement } };
+    }
+
+    // Returns new state_node_tree based on given state_node_tree with osds
+    // filtered out by tags in given osd_configs and current pool config.
+    // Requires: state_node_tree["osds"] must match osd_configs 1-1
+    json11::Json filter_state_node_tree_by_tags(const json11::Json & state_node_tree, std::vector<json11::Json> & osd_configs)
+    {
+        auto & osds = state_node_tree["osds"].array_items();
+
+        // Accepted state_node_tree nodes
+        auto accepted_nodes = state_node_tree["nodes"].object_items();
+
+        // List of accepted osds
+        std::vector<std::string> accepted_osds;
+
+        for (size_t i = 0; i < osd_configs.size(); i++)
+        {
+            auto & oc = osd_configs[i].object_items();
+
+            // Get osd number
+            auto osd_num = osds[i].as_string();
+
+            // We need tags in config to check against pool tags
+            if (oc.find("tags") == oc.end())
+            {
+                // Exclude osd from state_node_tree nodes
+                accepted_nodes.erase(osd_num);
+                continue;
+            }
+            else
+            {
+                // If all pool tags are in osd tags, accept osd
+                if (all_in_tags(osd_configs[i]["tags"], cfg["osd_tags"]))
+                {
+                    accepted_osds.push_back(osd_num);
+                }
+                // Otherwise, exclude osd
+                else
+                {
+                    // Exclude osd from state_node_tree nodes
+                    accepted_nodes.erase(osd_num);
+                }
+            }
+        }
+
+        return json11::Json::object { { "osds", accepted_osds }, { "nodes", accepted_nodes } };
+    }
+
+    // Returns new state_node_tree based on given state_node_tree with osds
+    // filtered out by stats parameters (block_size, bitmap_granularity) in
+    // given osd_stats and current pool config.
+    // Requires: state_node_tree["osds"] must match osd_stats 1-1
+    json11::Json filter_state_node_tree_by_stats(const json11::Json & state_node_tree, std::vector<json11::Json> & osd_stats)
+    {
+        auto & osds = state_node_tree["osds"].array_items();
+
+        // Accepted state_node_tree nodes
+        auto accepted_nodes = state_node_tree["nodes"].object_items();
+
+        // List of accepted osds
+        std::vector<std::string> accepted_osds;
+
+        uint64_t p_block_size = cfg["block_size"].uint64_value()
+            ? cfg["block_size"].uint64_value()
+            : parent->cli->st_cli.global_block_size;
+        uint64_t p_bitmap_granularity = cfg["bitmap_granularity"].uint64_value()
+            ? cfg["bitmap_granularity"].uint64_value()
+            : parent->cli->st_cli.global_bitmap_granularity;
+        uint32_t p_immediate_commit = cfg["immediate_commit"].is_string()
+            ? etcd_state_client_t::parse_immediate_commit(cfg["immediate_commit"].string_value())
+            : parent->cli->st_cli.global_immediate_commit;
+
+        for (size_t i = 0; i < osd_stats.size(); i++)
+        {
+            auto & os = osd_stats[i];
+            // Get osd number
+            auto osd_num = osds[i].as_string();
+            if (!os["data_block_size"].is_null() && os["data_block_size"] != p_block_size ||
+                !os["bitmap_granularity"].is_null() && os["bitmap_granularity"] != p_bitmap_granularity ||
+                !os["immediate_commit"].is_null() &&
+                etcd_state_client_t::parse_immediate_commit(os["immediate_commit"].string_value()) < p_immediate_commit)
+            {
+                accepted_nodes.erase(osd_num);
+            }
+            else
+            {
+                accepted_osds.push_back(osd_num);
+            }
+        }
+
+        return json11::Json::object { { "osds", accepted_osds }, { "nodes", accepted_nodes } };
+    }
+
+    // Returns maximum pg_size possible for given node_tree and failure_domain, starting at parent_node
+    uint64_t get_max_pg_size(json11::Json::object node_tree, const std::string & level, const std::string & parent_node)
+    {
+        uint64_t max_pg_sz = 0;
+
+        std::vector<std::string> nodes;
+
+        // Check if parent node is an osd (numeric)
+        if (parent_node != "" && stoull_full(parent_node))
+        {
+            // Add it to node list if osd is in node tree
+            if (node_tree.find(parent_node) != node_tree.end())
+                nodes.push_back(parent_node);
+        }
+        // If parent node given, ...
+        else if (parent_node != "")
+        {
+            // ... look for children nodes of this parent
+            for (auto & sn: node_tree)
+            {
+                auto & props = sn.second.object_items();
+
+                auto parent_prop = props.find("parent");
+                if (parent_prop != props.end() && (parent_prop->second.as_string() == parent_node))
+                {
+                    nodes.push_back(sn.first);
+
+                    // If we're not looking for all osds, we only need a single
+                    // child osd node
+                    if (level != "osd" && stoull_full(sn.first))
+                        break;
+                }
+            }
+        }
+        // No parent node given, and we're not looking for all osds
+        else if (level != "osd")
+        {
+            // ... look for all level nodes
+            for (auto & sn: node_tree)
+            {
+                auto & props = sn.second.object_items();
+
+                auto level_prop = props.find("level");
+                if (level_prop != props.end() && (level_prop->second.as_string() == level))
+                {
+                    nodes.push_back(sn.first);
+                }
+            }
+        }
+        // Otherwise, ...
+        else
+        {
+            // ... we're looking for osd nodes only
+            for (auto & sn: node_tree)
+            {
+                if (stoull_full(sn.first))
+                {
+                    nodes.push_back(sn.first);
+                }
+            }
+        }
+
+        // Process gathered nodes
+        for (auto & node: nodes)
+        {
+            // Check for osd node, return constant max size
+            if (stoull_full(node))
+            {
+                max_pg_sz += 1;
+            }
+            // Otherwise, ...
+            else
+            {
+                // ... exclude parent node from tree, and ...
+                node_tree.erase(parent_node);
+
+                // ... descend onto the resulting tree
+                max_pg_sz += get_max_pg_size(node_tree, level, node);
+            }
+        }
+
+        return max_pg_sz;
+    }
+
+    json11::Json create_pool(const etcd_kv_t & kv)
+    {
+        for (auto & p: kv.value.object_items())
+        {
+            // ID
+            uint64_t pool_id = stoull_full(p.first);
+            new_id = std::max(pool_id+1, new_id);
+            // Name
+            if (p.second["name"].string_value() == cfg["name"].string_value())
+            {
+                return "Pool with name \""+cfg["name"].string_value()+"\" already exists (ID "+std::to_string(pool_id)+")";
+            }
+        }
+        auto res = kv.value.object_items();
+        res[std::to_string(new_id)] = cfg;
+        return res;
+    }
+
+    // Checks whether tags2 tags are all in tags1 tags
+    bool all_in_tags(json11::Json tags1, json11::Json tags2)
+    {
+        if (!tags2.is_array())
+        {
+            tags2 = json11::Json::array{ tags2.string_value() };
+        }
+        if (!tags1.is_array())
+        {
+            tags1 = json11::Json::array{ tags1.string_value() };
+        }
+        for (auto & tag2: tags2.array_items())
+        {
+            bool found = false;
+            for (auto & tag1: tags1.array_items())
+            {
+                if (tag1 == tag2)
+                {
+                    found = true;
+                    break;
+                }
+            }
+            if (!found)
+            {
+                return false;
+            }
+        }
+        return true;
+    }
+};
+
+std::function<bool(cli_result_t &)> cli_tool_t::start_pool_create(json11::Json cfg)
+{
+    auto pool_creator = new pool_creator_t();
+    pool_creator->parent = this;
+    pool_creator->cfg = cfg.object_items();
+    pool_creator->force = cfg["force"].bool_value();
+    pool_creator->wait = cfg["wait"].bool_value();
+    return [pool_creator](cli_result_t & result)
+    {
+        pool_creator->loop();
+        if (pool_creator->is_done())
+        {
+            result = pool_creator->result;
+            delete pool_creator;
+            return true;
+        }
+        return false;
+    };
+}

src/cli_pool_ls.cpp

@@ -0,0 +1,723 @@
+// Copyright (c) Vitaliy Filippov, 2019+
+// License: VNPL-1.1 (see README.md for details)
+
+#include <algorithm>
+#include "cli.h"
+#include "cluster_client.h"
+#include "str_util.h"
+#include "pg_states.h"
+
+// List pools with space statistics
+// - df - minimal list with % used space
+// - pool-ls - same but with PG state and recovery %
+// - pool-ls -l - same but also include I/O statistics
+// - pool-ls --detail - use list format, include PG states, I/O stats and all pool parameters
+struct pool_lister_t
+{
+    cli_tool_t *parent;
+    std::string sort_field;
+    std::set<std::string> only_names;
+    bool reverse = false;
+    int max_count = 0;
+    bool show_recovery = false;
+    bool show_stats = false;
+    bool detailed = false;
+
+    int state = 0;
+    cli_result_t result;
+    std::map<pool_id_t, json11::Json::object> pool_stats;
+    struct io_stats_t
+    {
+        uint64_t count = 0;
+        uint64_t read_iops = 0;
+        uint64_t read_bps = 0;
+        uint64_t read_lat = 0;
+        uint64_t write_iops = 0;
+        uint64_t write_bps = 0;
+        uint64_t write_lat = 0;
+        uint64_t delete_iops = 0;
+        uint64_t delete_bps = 0;
+        uint64_t delete_lat = 0;
+    };
+    struct object_counts_t
+    {
+        uint64_t object_count = 0;
+        uint64_t misplaced_count = 0;
+        uint64_t degraded_count = 0;
+        uint64_t incomplete_count = 0;
+    };
+
+    bool is_done()
+    {
+        return state == 100;
+    }
+
+    void get_pool_stats(int base_state)
+    {
+        if (state == base_state+1)
+            goto resume_1;
+        // Space statistics - pool/stats/<pool>
+        parent->etcd_txn(json11::Json::object {
+            { "success", json11::Json::array {
+                json11::Json::object {
+                    { "request_range", json11::Json::object {
+                        { "key", base64_encode(
+                            parent->cli->st_cli.etcd_prefix+"/pool/stats/"
+                        ) },
+                        { "range_end", base64_encode(
+                            parent->cli->st_cli.etcd_prefix+"/pool/stats0"
+                        ) },
+                    } },
+                },
+                json11::Json::object {
+                    { "request_range", json11::Json::object {
+                        { "key", base64_encode(
+                            parent->cli->st_cli.etcd_prefix+"/osd/stats/"
+                        ) },
+                        { "range_end", base64_encode(
+                            parent->cli->st_cli.etcd_prefix+"/osd/stats0"
+                        ) },
+                    } },
+                },
+                json11::Json::object {
+                    { "request_range", json11::Json::object {
+                        { "key", base64_encode(
+                            parent->cli->st_cli.etcd_prefix+"/config/pools"
+                        ) },
+                    } },
+                },
+            } },
+        });
+        state = base_state+1;
+resume_1:
+        if (parent->waiting > 0)
+            return;
+        if (parent->etcd_err.err)
+        {
+            result = parent->etcd_err;
+            state = 100;
+            return;
+        }
+        auto space_info = parent->etcd_result;
+        auto config_pools = space_info["responses"][2]["response_range"]["kvs"][0];
+        if (!config_pools.is_null())
+        {
+            config_pools = parent->cli->st_cli.parse_etcd_kv(config_pools).value;
+        }
+        for (auto & kv_item: space_info["responses"][0]["response_range"]["kvs"].array_items())
+        {
+            auto kv = parent->cli->st_cli.parse_etcd_kv(kv_item);
+            // pool ID
+            pool_id_t pool_id;
+            char null_byte = 0;
+            int scanned = sscanf(kv.key.substr(parent->cli->st_cli.etcd_prefix.length()).c_str(), "/pool/stats/%u%c", &pool_id, &null_byte);
+            if (scanned != 1 || !pool_id || pool_id >= POOL_ID_MAX)
+            {
+                fprintf(stderr, "Invalid key in etcd: %s\n", kv.key.c_str());
+                continue;
+            }
+            // pool/stats/<N>
+            pool_stats[pool_id] = kv.value.object_items();
+        }
+        std::map<pool_id_t, uint64_t> osd_free;
+        for (auto & kv_item: space_info["responses"][1]["response_range"]["kvs"].array_items())
+        {
+            auto kv = parent->cli->st_cli.parse_etcd_kv(kv_item);
+            // osd ID
+            osd_num_t osd_num;
+            char null_byte = 0;
+            int scanned = sscanf(kv.key.substr(parent->cli->st_cli.etcd_prefix.length()).c_str(), "/osd/stats/%ju%c", &osd_num, &null_byte);
+            if (scanned != 1 || !osd_num || osd_num >= POOL_ID_MAX)
+            {
+                fprintf(stderr, "Invalid key in etcd: %s\n", kv.key.c_str());
+                continue;
+            }
+            // osd/stats/<N>::free
+            osd_free[osd_num] = kv.value["free"].uint64_value();
+        }
+        // Calculate max_avail for each pool
+        for (auto & pp: parent->cli->st_cli.pool_config)
+        {
+            auto & pool_cfg = pp.second;
+            uint64_t pool_avail = UINT64_MAX;
+            std::map<osd_num_t, uint64_t> pg_per_osd;
+            bool active = pool_cfg.real_pg_count > 0;
+            uint64_t pg_states = 0;
+            for (auto & pgp: pool_cfg.pg_config)
+            {
+                if (!(pgp.second.cur_state & PG_ACTIVE))
+                {
+                    active = false;
+                }
+                pg_states |= pgp.second.cur_state;
+                for (auto pg_osd: pgp.second.target_set)
+                {
+                    if (pg_osd != 0)
+                    {
+                        pg_per_osd[pg_osd]++;
+                    }
+                }
+            }
+            for (auto pg_per_pair: pg_per_osd)
+            {
+                uint64_t pg_free = osd_free[pg_per_pair.first] * pool_cfg.real_pg_count / pg_per_pair.second;
+                if (pool_avail > pg_free)
+                {
+                    pool_avail = pg_free;
+                }
+            }
+            if (pool_avail == UINT64_MAX)
+            {
+                pool_avail = 0;
+            }
+            if (pool_cfg.scheme != POOL_SCHEME_REPLICATED)
+            {
+                pool_avail *= (pool_cfg.pg_size - pool_cfg.parity_chunks);
+            }
+            // incomplete > has_incomplete > degraded > has_degraded > has_misplaced
+            std::string status;
+            if (!active)
+                status = "inactive";
+            else if (pg_states & PG_INCOMPLETE)
+                status = "incomplete";
+            else if (pg_states & PG_HAS_INCOMPLETE)
+                status = "has_incomplete";
+            else if (pg_states & PG_DEGRADED)
+                status = "degraded";
+            else if (pg_states & PG_HAS_DEGRADED)
+                status = "has_degraded";
+            else if (pg_states & PG_HAS_MISPLACED)
+                status = "has_misplaced";
+            else
+                status = "active";
+            pool_stats[pool_cfg.id] = json11::Json::object {
+                { "id", (uint64_t)pool_cfg.id },
+                { "name", pool_cfg.name },
+                { "status", status },
+                { "pg_count", pool_cfg.pg_count },
+                { "real_pg_count", pool_cfg.real_pg_count },
+                { "scheme_name", pool_cfg.scheme == POOL_SCHEME_REPLICATED
+                    ? std::to_string(pool_cfg.pg_size)+"/"+std::to_string(pool_cfg.pg_minsize)
+                    : "EC "+std::to_string(pool_cfg.pg_size-pool_cfg.parity_chunks)+"+"+std::to_string(pool_cfg.parity_chunks) },
+                { "used_raw", (uint64_t)(pool_stats[pool_cfg.id]["used_raw_tb"].number_value() * ((uint64_t)1<<40)) },
+                { "total_raw", (uint64_t)(pool_stats[pool_cfg.id]["total_raw_tb"].number_value() * ((uint64_t)1<<40)) },
+                { "max_available", pool_avail },
+                { "raw_to_usable", pool_stats[pool_cfg.id]["raw_to_usable"].number_value() },
+                { "space_efficiency", pool_stats[pool_cfg.id]["space_efficiency"].number_value() },
+                { "pg_real_size", pool_stats[pool_cfg.id]["pg_real_size"].uint64_value() },
+                { "osd_count", pg_per_osd.size() },
+            };
+        }
+        // Include full pool config
+        for (auto & pp: config_pools.object_items())
+        {
+            if (!pp.second.is_object())
+            {
+                continue;
+            }
+            auto pool_id = stoull_full(pp.first);
+            auto & st = pool_stats[pool_id];
+            for (auto & kv: pp.second.object_items())
+            {
+                if (st.find(kv.first) == st.end())
+                    st[kv.first] = kv.second;
+            }
+        }
+    }
+
+    void get_pg_stats(int base_state)
+    {
+        if (state == base_state+1)
+            goto resume_1;
+        // Space statistics - pool/stats/<pool>
+        parent->etcd_txn(json11::Json::object {
+            { "success", json11::Json::array {
+                json11::Json::object {
+                    { "request_range", json11::Json::object {
+                        { "key", base64_encode(
+                            parent->cli->st_cli.etcd_prefix+"/pg/stats/"
+                        ) },
+                        { "range_end", base64_encode(
+                            parent->cli->st_cli.etcd_prefix+"/pg/stats0"
+                        ) },
+                    } },
+                },
+            } },
+        });
+        state = base_state+1;
+resume_1:
+        if (parent->waiting > 0)
+            return;
+        if (parent->etcd_err.err)
+        {
+            result = parent->etcd_err;
+            state = 100;
+            return;
+        }
+        auto pg_stats = parent->etcd_result["responses"][0]["response_range"]["kvs"];
+        // Calculate recovery percent
+        std::map<pool_id_t, object_counts_t> counts;
+        for (auto & kv_item: pg_stats.array_items())
+        {
+            auto kv = parent->cli->st_cli.parse_etcd_kv(kv_item);
+            // pool ID & pg number
+            pool_id_t pool_id;
+            pg_num_t pg_num = 0;
+            char null_byte = 0;
+            int scanned = sscanf(kv.key.substr(parent->cli->st_cli.etcd_prefix.length()).c_str(),
+                "/pg/stats/%u/%u%c", &pool_id, &pg_num, &null_byte);
+            if (scanned != 2 || !pool_id || pool_id >= POOL_ID_MAX)
+            {
+                fprintf(stderr, "Invalid key in etcd: %s\n", kv.key.c_str());
+                continue;
+            }
+            auto & cnt = counts[pool_id];
+            cnt.object_count += kv.value["object_count"].uint64_value();
+            cnt.misplaced_count += kv.value["misplaced_count"].uint64_value();
+            cnt.degraded_count += kv.value["degraded_count"].uint64_value();
+            cnt.incomplete_count += kv.value["incomplete_count"].uint64_value();
+        }
+        for (auto & pp: pool_stats)
+        {
+            auto & cnt = counts[pp.first];
+            auto & st = pp.second;
+            st["object_count"] = cnt.object_count;
+            st["misplaced_count"] = cnt.misplaced_count;
+            st["degraded_count"] = cnt.degraded_count;
+            st["incomplete_count"] = cnt.incomplete_count;
+        }
+    }
+
+    void get_inode_stats(int base_state)
+    {
+        if (state == base_state+1)
+            goto resume_1;
+        // Space statistics - pool/stats/<pool>
+        parent->etcd_txn(json11::Json::object {
+            { "success", json11::Json::array {
+                json11::Json::object {
+                    { "request_range", json11::Json::object {
+                        { "key", base64_encode(
+                            parent->cli->st_cli.etcd_prefix+"/inode/stats/"
+                        ) },
+                        { "range_end", base64_encode(
+                            parent->cli->st_cli.etcd_prefix+"/inode/stats0"
+                        ) },
+                    } },
+                },
+            } },
+        });
+        state = base_state+1;
+resume_1:
+        if (parent->waiting > 0)
+            return;
+        if (parent->etcd_err.err)
+        {
+            result = parent->etcd_err;
+            state = 100;
+            return;
+        }
+        auto inode_stats = parent->etcd_result["responses"][0]["response_range"]["kvs"];
+        // Performance statistics
+        std::map<pool_id_t, io_stats_t> pool_io;
+        for (auto & kv_item: inode_stats.array_items())
+        {
+            auto kv = parent->cli->st_cli.parse_etcd_kv(kv_item);
+            // pool ID & inode number
+            pool_id_t pool_id;
+            inode_t only_inode_num;
+            char null_byte = 0;
+            int scanned = sscanf(kv.key.substr(parent->cli->st_cli.etcd_prefix.length()).c_str(),
+                "/inode/stats/%u/%ju%c", &pool_id, &only_inode_num, &null_byte);
+            if (scanned != 2 || !pool_id || pool_id >= POOL_ID_MAX || INODE_POOL(only_inode_num) != 0)
+            {
+                fprintf(stderr, "Invalid key in etcd: %s\n", kv.key.c_str());
+                continue;
+            }
+            auto & io = pool_io[pool_id];
+            io.read_iops += kv.value["read"]["iops"].uint64_value();
+            io.read_bps += kv.value["read"]["bps"].uint64_value();
+            io.read_lat += kv.value["read"]["lat"].uint64_value();
+            io.write_iops += kv.value["write"]["iops"].uint64_value();
+            io.write_bps += kv.value["write"]["bps"].uint64_value();
+            io.write_lat += kv.value["write"]["lat"].uint64_value();
+            io.delete_iops += kv.value["delete"]["iops"].uint64_value();
+            io.delete_bps += kv.value["delete"]["bps"].uint64_value();
+            io.delete_lat += kv.value["delete"]["lat"].uint64_value();
+            io.count++;
+        }
+        for (auto & pp: pool_stats)
+        {
+            auto & io = pool_io[pp.first];
+            if (io.count > 0)
+            {
+                io.read_lat /= io.count;
+                io.write_lat /= io.count;
+                io.delete_lat /= io.count;
+            }
+            auto & st = pp.second;
+            st["read_iops"] = io.read_iops;
+            st["read_bps"] = io.read_bps;
+            st["read_lat"] = io.read_lat;
+            st["write_iops"] = io.write_iops;
+            st["write_bps"] = io.write_bps;
+            st["write_lat"] = io.write_lat;
+            st["delete_iops"] = io.delete_iops;
+            st["delete_bps"] = io.delete_bps;
+            st["delete_lat"] = io.delete_lat;
+        }
+    }
+
+    json11::Json::array to_list()
+    {
+        json11::Json::array list;
+        for (auto & kv: pool_stats)
+        {
+            if (!only_names.size())
+            {
+                list.push_back(kv.second);
+            }
+            else
+            {
+                for (auto glob: only_names)
+                {
+                    if (stupid_glob(kv.second["name"].string_value(), glob))
+                    {
+                        list.push_back(kv.second);
+                        break;
+                    }
+                }
+            }
+        }
+        if (sort_field == "name" || sort_field == "scheme" ||
+            sort_field == "scheme_name" || sort_field == "status")
+        {
+            std::sort(list.begin(), list.end(), [this](json11::Json a, json11::Json b)
+            {
+                auto av = a[sort_field].as_string();
+                auto bv = b[sort_field].as_string();
+                return reverse ? av > bv : av < bv;
+            });
+        }
+        else
+        {
+            std::sort(list.begin(), list.end(), [this](json11::Json a, json11::Json b)
+            {
+                auto av = a[sort_field].number_value();
+                auto bv = b[sort_field].number_value();
+                return reverse ? av > bv : av < bv;
+            });
+        }
+        if (max_count > 0 && list.size() > max_count)
+        {
+            list.resize(max_count);
+        }
+        return list;
+    }
+
+    void loop()
+    {
+        if (state == 1)
+            goto resume_1;
+        if (state == 2)
+            goto resume_2;
+        if (state == 3)
+            goto resume_3;
+        if (state == 100)
+            return;
+        show_stats = show_stats || detailed;
+        show_recovery = show_recovery || detailed;
+resume_1:
+        get_pool_stats(0);
+        if (parent->waiting > 0)
+            return;
+        if (show_stats)
+        {
+resume_2:
+            get_inode_stats(1);
+            if (parent->waiting > 0)
+                return;
+        }
+        if (show_recovery)
+        {
+resume_3:
+            get_pg_stats(2);
+            if (parent->waiting > 0)
+                return;
+        }
+        if (parent->json_output)
+        {
+            // JSON output
+            result.data = to_list();
+            state = 100;
+            return;
+        }
+        json11::Json::array list;
+        for (auto & kv: pool_stats)
+        {
+            auto & st = kv.second;
+            double raw_to = st["raw_to_usable"].number_value();
+            if (raw_to < 0.000001 && raw_to > -0.000001)
+                raw_to = 1;
+            st["pg_count_fmt"] = st["real_pg_count"] == st["pg_count"]
+                ? st["real_pg_count"].as_string()
+                : st["real_pg_count"].as_string()+"->"+st["pg_count"].as_string();
+            st["total_fmt"] = format_size(st["total_raw"].uint64_value() / raw_to);
+            st["used_fmt"] = format_size(st["used_raw"].uint64_value() / raw_to);
+            st["max_avail_fmt"] = format_size(st["max_available"].uint64_value());
+            st["used_pct"] = format_q(st["total_raw"].uint64_value()
+                ? (100 - 100*st["max_available"].uint64_value() *
+                    st["raw_to_usable"].number_value() / st["total_raw"].uint64_value())
+                : 100)+"%";
+            st["eff_fmt"] = format_q(st["space_efficiency"].number_value()*100)+"%";
+            if (show_stats)
+            {
+                st["read_bw"] = format_size(st["read_bps"].uint64_value())+"/s";
+                st["write_bw"] = format_size(st["write_bps"].uint64_value())+"/s";
+                st["delete_bw"] = format_size(st["delete_bps"].uint64_value())+"/s";
+                st["read_iops"] = format_q(st["read_iops"].number_value());
+                st["write_iops"] = format_q(st["write_iops"].number_value());
+                st["delete_iops"] = format_q(st["delete_iops"].number_value());
+                st["read_lat_f"] = format_lat(st["read_lat"].uint64_value());
+                st["write_lat_f"] = format_lat(st["write_lat"].uint64_value());
+                st["delete_lat_f"] = format_lat(st["delete_lat"].uint64_value());
+            }
+            if (show_recovery)
+            {
+                auto object_count = st["object_count"].uint64_value();
+                auto recovery_pct = 100.0 * (object_count - (st["misplaced_count"].uint64_value() +
+                    st["degraded_count"].uint64_value() + st["incomplete_count"].uint64_value())) /
+                    (object_count ? object_count : 1);
+                st["recovery_fmt"] = format_q(recovery_pct)+"%";
+            }
+        }
+        if (detailed)
+        {
+            for (auto & kv: pool_stats)
+            {
+                auto & st = kv.second;
+                auto total = st["object_count"].uint64_value();
+                auto obj_size = st["block_size"].uint64_value();
+                if (!obj_size)
+                    obj_size = parent->cli->st_cli.global_block_size;
+                if (st["scheme"] == "ec")
+                    obj_size *= st["pg_size"].uint64_value() - st["parity_chunks"].uint64_value();
+                else if (st["scheme"] == "xor")
+                    obj_size *= st["pg_size"].uint64_value() - 1;
+                auto n = st["misplaced_count"].uint64_value();
+                if (n > 0)
+                    st["misplaced_fmt"] = format_size(n * obj_size) + " / " + format_q(100.0 * n / total);
+                n = st["degraded_count"].uint64_value();
+                if (n > 0)
+                    st["degraded_fmt"] = format_size(n * obj_size) + " / " + format_q(100.0 * n / total);
+                n = st["incomplete_count"].uint64_value();
+                if (n > 0)
+                    st["incomplete_fmt"] = format_size(n * obj_size) + " / " + format_q(100.0 * n / total);
+                st["read_fmt"] = st["read_bw"].string_value()+", "+st["read_iops"].string_value()+" op/s, "+
+                    st["read_lat_f"].string_value()+" lat";
+                st["write_fmt"] = st["write_bw"].string_value()+", "+st["write_iops"].string_value()+" op/s, "+
+                    st["write_lat_f"].string_value()+" lat";
+                st["delete_fmt"] = st["delete_bw"].string_value()+", "+st["delete_iops"].string_value()+" op/s, "+
+                    st["delete_lat_f"].string_value()+" lat";
+                if (st["scheme"] == "replicated")
+                    st["scheme_name"] = "x"+st["pg_size"].as_string();
+                if (st["failure_domain"].string_value() == "")
+                    st["failure_domain"] = "host";
+                st["osd_tags_fmt"] = implode(", ", st["osd_tags"]);
+                st["primary_affinity_tags_fmt"] = implode(", ", st["primary_affinity_tags"]);
+                if (st["block_size"].uint64_value())
+                    st["block_size_fmt"] = format_size(st["block_size"].uint64_value());
+                if (st["bitmap_granularity"].uint64_value())
+                    st["bitmap_granularity_fmt"] = format_size(st["bitmap_granularity"].uint64_value());
+            }
+            // All pool parameters are only displayed in the "detailed" mode
+            // because there's too many of them to show them in table
+            auto cols = std::vector<std::pair<std::string, std::string>>{
+                { "name", "Name" },
+                { "id", "ID" },
+                { "scheme_name", "Scheme" },
+                { "used_for_fs", "Used for VitastorFS" },
+                { "status", "Status" },
+                { "pg_count_fmt", "PGs" },
+                { "pg_minsize", "PG minsize" },
+                { "failure_domain", "Failure domain" },
+                { "root_node", "Root node" },
+                { "osd_tags_fmt", "OSD tags" },
+                { "primary_affinity_tags_fmt", "Primary affinity" },
+                { "block_size_fmt", "Block size" },
+                { "bitmap_granularity_fmt", "Bitmap granularity" },
+                { "immediate_commit", "Immediate commit" },
+                { "scrub_interval", "Scrub interval" },
+                { "inode_stats_fmt", "Per-inode stats" },
+                { "pg_stripe_size", "PG stripe size" },
+                { "max_osd_combinations", "Max OSD combinations" },
+                { "total_fmt", "Total" },
+                { "used_fmt", "Used" },
+                { "max_avail_fmt", "Available" },
+                { "used_pct", "Used%" },
+                { "eff_fmt", "Efficiency" },
+                { "osd_count", "OSD count" },
+                { "misplaced_fmt", "Misplaced" },
+                { "degraded_fmt", "Degraded" },
+                { "incomplete_fmt", "Incomplete" },
+                { "read_fmt", "Read" },
+                { "write_fmt", "Write" },
+                { "delete_fmt", "Delete" },
+            };
+            auto list = to_list();
+            size_t title_len = 0;
+            for (auto & item: list)
+            {
+                title_len = print_detail_title_len(item, cols, title_len);
+            }
+            for (auto & item: list)
+            {
+                if (result.text != "")
+                    result.text += "\n";
+                result.text += print_detail(item, cols, title_len, parent->color);
+            }
+            state = 100;
+            return;
+        }
+        // Table output: name, scheme_name, pg_count, total, used, max_avail, used%, efficiency
+        json11::Json::array cols;
+        cols.push_back(json11::Json::object{
+            { "key", "name" },
+            { "title", "NAME" },
+        });
+        cols.push_back(json11::Json::object{
+            { "key", "scheme_name" },
+            { "title", "SCHEME" },
+        });
+        cols.push_back(json11::Json::object{
+            { "key", "status" },
+            { "title", "STATUS" },
+        });
+        cols.push_back(json11::Json::object{
+            { "key", "pg_count_fmt" },
+            { "title", "PGS" },
+        });
+        cols.push_back(json11::Json::object{
+            { "key", "total_fmt" },
+            { "title", "TOTAL" },
+        });
+        cols.push_back(json11::Json::object{
+            { "key", "used_fmt" },
+            { "title", "USED" },
+        });
+        cols.push_back(json11::Json::object{
+            { "key", "max_avail_fmt" },
+            { "title", "AVAILABLE" },
+        });
+        cols.push_back(json11::Json::object{
+            { "key", "used_pct" },
+            { "title", "USED%" },
+        });
+        cols.push_back(json11::Json::object{
+            { "key", "eff_fmt" },
+            { "title", "EFFICIENCY" },
+        });
+        if (show_recovery)
+        {
+            cols.push_back(json11::Json::object{ { "key", "recovery_fmt" }, { "title", "RECOVERY" } });
+        }
+        if (show_stats)
+        {
+            cols.push_back(json11::Json::object{ { "key", "read_bw" }, { "title", "READ" } });
+            cols.push_back(json11::Json::object{ { "key", "read_iops" }, { "title", "IOPS" } });
+            cols.push_back(json11::Json::object{ { "key", "read_lat_f" }, { "title", "LAT" } });
+            cols.push_back(json11::Json::object{ { "key", "write_bw" }, { "title", "WRITE" } });
+            cols.push_back(json11::Json::object{ { "key", "write_iops" }, { "title", "IOPS" } });
+            cols.push_back(json11::Json::object{ { "key", "write_lat_f" }, { "title", "LAT" } });
+            cols.push_back(json11::Json::object{ { "key", "delete_bw" }, { "title", "DELETE" } });
+            cols.push_back(json11::Json::object{ { "key", "delete_iops" }, { "title", "IOPS" } });
+            cols.push_back(json11::Json::object{ { "key", "delete_lat_f" }, { "title", "LAT" } });
+        }
+        result.data = to_list();
+        result.text = print_table(result.data, cols, parent->color);
+        state = 100;
+    }
+};
+
+size_t print_detail_title_len(json11::Json item, std::vector<std::pair<std::string, std::string>> names, size_t prev_len)
+{
+    size_t title_len = prev_len;
+    for (auto & kv: names)
+    {
+        if (!item[kv.first].is_null() && (!item[kv.first].is_string() || item[kv.first].string_value() != ""))
+        {
+            size_t len = utf8_length(kv.second);
+            title_len = title_len < len ? len : title_len;
+        }
+    }
+    return title_len;
+}
+
+std::string print_detail(json11::Json item, std::vector<std::pair<std::string, std::string>> names, size_t title_len, bool use_esc)
+{
+    std::string str;
+    for (auto & kv: names)
+    {
+        if (!item[kv.first].is_null() && (!item[kv.first].is_string() || item[kv.first].string_value() != ""))
+        {
+            str += kv.second;
+            str += ": ";
+            size_t len = utf8_length(kv.second);
+            for (int j = 0; j < title_len-len; j++)
+                str += ' ';
+            if (use_esc)
+                str += "\033[1m";
+            str += item[kv.first].as_string();
+            if (use_esc)
+                str += "\033[0m";
+            str += "\n";
+        }
+    }
+    return str;
+}
+
+std::function<bool(cli_result_t &)> cli_tool_t::start_pool_ls(json11::Json cfg)
+{
+    auto lister = new pool_lister_t();
+    lister->parent = this;
+    lister->show_recovery = cfg["show_recovery"].bool_value();
+    lister->show_stats = cfg["long"].bool_value();
+    lister->detailed = cfg["detail"].bool_value();
+    lister->sort_field = cfg["sort"].string_value();
+    if ((lister->sort_field == "osd_tags") ||
+        (lister->sort_field == "primary_affinity_tags" ))
+        lister->sort_field = lister->sort_field + "_fmt";
+    lister->reverse = cfg["reverse"].bool_value();
+    lister->max_count = cfg["count"].uint64_value();
+    for (auto & item: cfg["names"].array_items())
+    {
+        lister->only_names.insert(item.string_value());
+    }
+    return [lister](cli_result_t & result)
+    {
+        lister->loop();
+        if (lister->is_done())
+        {
+            result = lister->result;
+            delete lister;
+            return true;
+        }
+        return false;
+    };
+}
+
+std::string implode(const std::string & sep, json11::Json array)
+{
+    if (array.is_number() || array.is_bool() || array.is_string())
+    {
+        return array.as_string();
+    }
+    std::string res;
+    bool first = true;
+    for (auto & item: array.array_items())
+    {
+        res += (first ? item.as_string() : sep+item.as_string());
+        first = false;
+    }
+    return res;
+}

src/cli_pool_modify.cpp

@@ -0,0 +1,203 @@
+// Copyright (c) MIND Software LLC, 2023 (info@mindsw.io)
+// I accept Vitastor CLA: see CLA-en.md for details
+// Copyright (c) Vitaliy Filippov, 2024
+// License: VNPL-1.1 (see README.md for details)
+
+#include <ctype.h>
+#include "cli.h"
+#include "cli_pool_cfg.h"
+#include "cluster_client.h"
+#include "str_util.h"
+
+struct pool_changer_t
+{
+    cli_tool_t *parent;
+
+    // Required parameters (id/name)
+    pool_id_t pool_id = 0;
+    std::string pool_name;
+    json11::Json::object cfg;
+    json11::Json::object new_cfg;
+    bool force = false;
+
+    json11::Json old_cfg;
+
+    int state = 0;
+    cli_result_t result;
+
+    // Updated pools
+    json11::Json new_pools;
+
+    // Expected pools mod revision
+    uint64_t pools_mod_rev;
+
+    bool is_done() { return state == 100; }
+
+    void loop()
+    {
+        if (state == 1)
+            goto resume_1;
+        else if (state == 2)
+            goto resume_2;
+        pool_id = stoull_full(cfg["old_name"].string_value());
+        if (!pool_id)
+        {
+            pool_name = cfg["old_name"].string_value();
+            if (pool_name == "")
+            {
+                result = (cli_result_t){ .err = ENOENT, .text = "Pool ID or name is required to modify it" };
+                state = 100;
+                return;
+            }
+        }
+resume_0:
+        // Get pools from etcd
+        parent->etcd_txn(json11::Json::object {
+            { "success", json11::Json::array {
+                json11::Json::object {
+                    { "request_range", json11::Json::object {
+                        { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/config/pools") },
+                    } }
+                },
+            } },
+        });
+        state = 1;
+resume_1:
+        if (parent->waiting > 0)
+            return;
+        if (parent->etcd_err.err)
+        {
+            result = parent->etcd_err;
+            state = 100;
+            return;
+        }
+        {
+            // Parse received pools from etcd
+            auto kv = parent->cli->st_cli.parse_etcd_kv(parent->etcd_result["responses"][0]["response_range"]["kvs"][0]);
+
+            // Get pool by name or ID
+            old_cfg = json11::Json();
+            if (pool_name != "")
+            {
+                for (auto & pce: kv.value.object_items())
+                {
+                    if (pce.second["name"] == pool_name)
+                    {
+                        pool_id = stoull_full(pce.first);
+                        old_cfg = pce.second;
+                        break;
+                    }
+                }
+            }
+            else
+            {
+                pool_name = std::to_string(pool_id);
+                old_cfg = kv.value[pool_name];
+            }
+            if (!old_cfg.is_object())
+            {
+                result = (cli_result_t){ .err = ENOENT, .text = "Pool "+pool_name+" does not exist" };
+                state = 100;
+                return;
+            }
+
+            // Update pool
+            new_cfg = cfg;
+            result.text = validate_pool_config(new_cfg, old_cfg, parent->cli->st_cli.global_block_size,
+                parent->cli->st_cli.global_bitmap_granularity, force);
+            if (result.text != "")
+            {
+                result.err = EINVAL;
+                state = 100;
+                return;
+            }
+
+            if (new_cfg.find("used_for_fs") != new_cfg.end() && !force)
+            {
+                // Check that pool doesn't have images
+                auto img_it = parent->cli->st_cli.inode_config.lower_bound(INODE_WITH_POOL(pool_id, 0));
+                if (img_it != parent->cli->st_cli.inode_config.end() && INODE_POOL(img_it->first) == pool_id &&
+                    img_it->second.name == new_cfg["used_for_fs"].string_value())
+                {
+                    // Only allow metadata image to exist in the FS pool
+                    img_it++;
+                }
+                if (img_it != parent->cli->st_cli.inode_config.end() && INODE_POOL(img_it->first) == pool_id)
+                {
+                    result = (cli_result_t){ .err = ENOENT, .text = "Pool "+pool_name+" has block images, delete them before using it for VitastorFS" };
+                    state = 100;
+                    return;
+                }
+            }
+
+            // Update pool
+            auto pls = kv.value.object_items();
+            pls[std::to_string(pool_id)] = new_cfg;
+            new_pools = pls;
+
+            // Expected pools mod revision
+            pools_mod_rev = kv.mod_revision;
+        }
+        // Update pools in etcd
+        parent->etcd_txn(json11::Json::object {
+            { "compare", json11::Json::array {
+                json11::Json::object {
+                    { "target", "MOD" },
+                    { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/config/pools") },
+                    { "result", "LESS" },
+                    { "mod_revision", pools_mod_rev+1 },
+                }
+            } },
+            { "success", json11::Json::array {
+                json11::Json::object {
+                    { "request_put", json11::Json::object {
+                        { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/config/pools") },
+                        { "value", base64_encode(new_pools.dump()) },
+                    } },
+                },
+            } },
+        });
+        state = 2;
+resume_2:
+        if (parent->waiting > 0)
+            return;
+        if (parent->etcd_err.err)
+        {
+            result = parent->etcd_err;
+            state = 100;
+            return;
+        }
+        if (!parent->etcd_result["succeeded"].bool_value())
+        {
+            // CAS failure - retry
+            fprintf(stderr, "Warning: pool configuration was modified in the meantime by someone else\n");
+            goto resume_0;
+        }
+        // Successfully updated pool
+        result = (cli_result_t){
+            .err = 0,
+            .text = "Pool "+pool_name+" updated",
+            .data = new_pools,
+        };
+        state = 100;
+    }
+};
+
+std::function<bool(cli_result_t &)> cli_tool_t::start_pool_modify(json11::Json cfg)
+{
+    auto pool_changer = new pool_changer_t();
+    pool_changer->parent = this;
+    pool_changer->cfg = cfg.object_items();
+    pool_changer->force = cfg["force"].bool_value();
+    return [pool_changer](cli_result_t & result)
+    {
+        pool_changer->loop();
+        if (pool_changer->is_done())
+        {
+            result = pool_changer->result;
+            delete pool_changer;
+            return true;
+        }
+        return false;
+    };
+}

src/cli_pool_rm.cpp

@@ -0,0 +1,226 @@
+// Copyright (c) MIND Software LLC, 2023 (info@mindsw.io)
+// I accept Vitastor CLA: see CLA-en.md for details
+// Copyright (c) Vitaliy Filippov, 2024
+// License: VNPL-1.1 (see README.md for details)
+
+#include <ctype.h>
+#include "cli.h"
+#include "cluster_client.h"
+#include "str_util.h"
+
+struct pool_remover_t
+{
+    cli_tool_t *parent;
+
+    // Required parameters (id/name)
+
+    pool_id_t pool_id = 0;
+    std::string pool_name;
+
+    // Force removal
+    bool force;
+
+    int state = 0;
+    cli_result_t result;
+
+    // Is pool valid?
+    bool pool_valid = false;
+
+    // Updated pools
+    json11::Json new_pools;
+
+    // Expected pools mod revision
+    uint64_t pools_mod_rev;
+
+    bool is_done() { return state == 100; }
+
+    void loop()
+    {
+        if (state == 1)
+            goto resume_1;
+        else if (state == 2)
+            goto resume_2;
+        else if (state == 3)
+            goto resume_3;
+
+        // Pool name (or id) required
+        if (!pool_id && pool_name == "")
+        {
+            result = (cli_result_t){ .err = EINVAL, .text = "Pool name or id must be given" };
+            state = 100;
+            return;
+        }
+
+        // Validate pool name/id
+
+        // Get pool id by name (if name given)
+        if (pool_name != "")
+        {
+            for (auto & ic: parent->cli->st_cli.pool_config)
+            {
+                if (ic.second.name == pool_name)
+                {
+                    pool_id = ic.first;
+                    pool_valid = 1;
+                    break;
+                }
+            }
+        }
+        // Otherwise, check if given pool id is valid
+        else
+        {
+            // Set pool name from id (for easier logging)
+            pool_name = "id " + std::to_string(pool_id);
+
+            // Look-up pool id in pool_config
+            if (parent->cli->st_cli.pool_config.find(pool_id) != parent->cli->st_cli.pool_config.end())
+            {
+                pool_valid = 1;
+            }
+        }
+
+        // Need a valid pool to proceed
+        if (!pool_valid)
+        {
+            result = (cli_result_t){ .err = ENOENT, .text = "Pool "+pool_name+" does not exist" };
+            state = 100;
+            return;
+        }
+
+        // Unless forced, check if pool has associated Images/Snapshots
+        if (!force)
+        {
+            std::string images;
+
+            for (auto & ic: parent->cli->st_cli.inode_config)
+            {
+                if (pool_id && INODE_POOL(ic.second.num) != pool_id)
+                {
+                    continue;
+                }
+                images += ((images != "") ? ", " : "") + ic.second.name;
+            }
+
+            if (images != "")
+            {
+                result = (cli_result_t){
+                    .err = ENOTEMPTY,
+                    .text =
+                        "Pool "+pool_name+" cannot be removed as it still has the following "
+                        "images/snapshots associated with it: "+images
+                };
+                state = 100;
+                return;
+            }
+        }
+
+        // Proceed to deleting the pool
+        state = 1;
+        do
+        {
+resume_1:
+            // Get pools from etcd
+            parent->etcd_txn(json11::Json::object {
+                { "success", json11::Json::array {
+                    json11::Json::object {
+                        { "request_range", json11::Json::object {
+                            { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/config/pools") },
+                        } }
+                    },
+                } },
+            });
+            state = 2;
+resume_2:
+            if (parent->waiting > 0)
+                return;
+            if (parent->etcd_err.err)
+            {
+                result = parent->etcd_err;
+                state = 100;
+                return;
+            }
+            {
+                // Parse received pools from etcd
+                auto kv = parent->cli->st_cli.parse_etcd_kv(parent->etcd_result["responses"][0]["response_range"]["kvs"][0]);
+
+                // Remove pool
+                auto p = kv.value.object_items();
+                if (p.erase(std::to_string(pool_id)) != 1)
+                {
+                    result = (cli_result_t){
+                        .err = ENOENT,
+                        .text = "Failed to erase pool "+pool_name+" from: "+kv.value.string_value()
+                    };
+                    state = 100;
+                    return;
+                }
+
+                // Record updated pools
+                new_pools = p;
+
+                // Expected pools mod revision
+                pools_mod_rev = kv.mod_revision;
+            }
+            // Update pools in etcd
+            parent->etcd_txn(json11::Json::object {
+                { "compare", json11::Json::array {
+                    json11::Json::object {
+                        { "target", "MOD" },
+                        { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/config/pools") },
+                        { "result", "LESS" },
+                        { "mod_revision", pools_mod_rev+1 },
+                    }
+                } },
+                { "success", json11::Json::array {
+                    json11::Json::object {
+                        { "request_put", json11::Json::object {
+                            { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/config/pools") },
+                            { "value", base64_encode(new_pools.dump()) },
+                        } },
+                    },
+                } },
+            });
+            state = 3;
+resume_3:
+            if (parent->waiting > 0)
+                return;
+            if (parent->etcd_err.err)
+            {
+                result = parent->etcd_err;
+                state = 100;
+                return;
+            }
+        } while (!parent->etcd_result["succeeded"].bool_value());
+
+        // Successfully deleted pool
+        result = (cli_result_t){
+            .err = 0,
+            .text = "Pool "+pool_name+" deleted",
+            .data = new_pools
+        };
+        state = 100;
+    }
+};
+
+std::function<bool(cli_result_t &)> cli_tool_t::start_pool_rm(json11::Json cfg)
+{
+    auto pool_remover = new pool_remover_t();
+    pool_remover->parent = this;
+
+    pool_remover->pool_id = cfg["pool"].uint64_value();
+    pool_remover->pool_name = pool_remover->pool_id ? "" : cfg["pool"].as_string();
+
+    pool_remover->force = !cfg["force"].is_null();
+
+    return [pool_remover](cli_result_t & result)
+    {
+        pool_remover->loop();
+        if (pool_remover->is_done())
+        {
+            result = pool_remover->result;
+            delete pool_remover;
+            return true;
+        }
+        return false;
+    };
+}

src/cli_rm.cpp

@@ -53,6 +53,8 @@ struct snap_remover_t
     int use_cas = 1;
     // interval between fsyncs
     int fsync_interval = 128;
+    // ignore deletion errors
+    bool down_ok = false;
 
     std::map<inode_t,int> sources;
     std::map<inode_t,uint64_t> inode_used;
@@ -245,6 +247,7 @@ resume_8:
         }
         state = 100;
         result = (cli_result_t){
+            .err = 0,
             .text = "",
             .data = my_result(result.data),
         };
@@ -679,6 +682,7 @@ resume_100:
             { "inode", inode },
             { "pool", (uint64_t)INODE_POOL(inode) },
             { "fsync-interval", fsync_interval },
+            { "down-ok", down_ok },
         });
     }
 };
@@ -690,6 +694,7 @@ std::function<bool(cli_result_t &)> cli_tool_t::start_rm(json11::Json cfg)
     snap_remover->from_name = cfg["from"].string_value();
     snap_remover->to_name = cfg["to"].string_value();
     snap_remover->fsync_interval = cfg["fsync_interval"].uint64_value();
+    snap_remover->down_ok = cfg["down_ok"].bool_value();
     if (!snap_remover->fsync_interval)
         snap_remover->fsync_interval = 128;
     if (!cfg["cas"].is_null())

src/cli_rm_data.cpp

@@ -25,6 +25,7 @@ struct rm_inode_t
     uint64_t inode = 0;
     pool_id_t pool_id = 0;
     uint64_t min_offset = 0;
+    bool down_ok = false;
 
     cli_tool_t *parent = NULL;
     inode_list_t *lister = NULL;
@@ -212,7 +213,9 @@ struct rm_inode_t
         }
         if (parent->progress && total_count > 0 && total_done*1000/total_count != total_prev_pct)
         {
-            fprintf(stderr, "\rRemoved %ju/%ju objects, %ju more PGs to list...", total_done, total_count, pgs_to_list);
+            fprintf(stderr, parent->color
+                ? "\rRemoved %ju/%ju objects, %ju more PGs to list..."
+                : "Removed %ju/%ju objects, %ju more PGs to list...\n", total_done, total_count, pgs_to_list);
             total_prev_pct = total_done*1000/total_count;
         }
         if (lists_done && !lists.size())
@@ -221,17 +224,18 @@ struct rm_inode_t
             {
                 fprintf(stderr, "\n");
             }
-            if (parent->progress && (total_done < total_count || inactive_osds.size() > 0 || error_count > 0))
+            bool is_error = (total_done < total_count || inactive_osds.size() > 0 || error_count > 0);
+            if (parent->progress && is_error)
             {
                 fprintf(
                     stderr, "Warning: Pool:%u,ID:%ju inode data may not have been fully removed.\n"
-                    " Use `vitastor-cli rm-data --pool %u --inode %ju` if you encounter it in listings.\n",
+                    "Use `vitastor-cli rm-data --pool %u --inode %ju` if you encounter it in listings.\n",
                     pool_id, INODE_NO_POOL(inode), pool_id, INODE_NO_POOL(inode)
                 );
             }
             result = (cli_result_t){
-                .err = error_count > 0 ? EIO : 0,
-                .text = error_count > 0 ? "Some blocks were not removed" : (
+                .err = is_error && !down_ok ? EIO : 0,
+                .text = is_error ? "Some blocks were not removed" : (
                     "Done, inode "+std::to_string(INODE_NO_POOL(inode))+" from pool "+
                     std::to_string(pool_id)+" removed"),
                 .data = json11::Json::object {
@@ -280,6 +284,7 @@ std::function<bool(cli_result_t &)> cli_tool_t::start_rm_data(json11::Json cfg)
     {
         remover->inode = (remover->inode & (((uint64_t)1 << (64-POOL_ID_BITS)) - 1)) | (((uint64_t)remover->pool_id) << (64-POOL_ID_BITS));
     }
+    remover->down_ok = cfg["down_ok"].bool_value();
     remover->pool_id = INODE_POOL(remover->inode);
     remover->min_offset = cfg["min_offset"].uint64_value();
     return [remover](cli_result_t & result)

src/cluster_client.cpp

@@ -6,7 +6,7 @@
 #include "cluster_client_impl.h"
 #include "http_client.h" // json_is_true
 
-cluster_client_t::cluster_client_t(ring_loop_t *ringloop, timerfd_manager_t *tfd, json11::Json & config)
+cluster_client_t::cluster_client_t(ring_loop_t *ringloop, timerfd_manager_t *tfd, json11::Json config)
 {
     wb = new writeback_cache_t();
 
@@ -238,7 +238,8 @@ void cluster_client_t::erase_op(cluster_op_t *op)
         // which may continue following SYNCs, but these SYNCs
         // should know about the changed buffer state
         // This is ugly but this is the way we do it
-        std::function<void(cluster_op_t*)>(op->callback)(op);
+        auto cb = std::move(op->callback);
+        cb(op);
     }
     if (!(flags & OP_IMMEDIATE_COMMIT) || enable_writeback)
     {
@@ -248,7 +249,8 @@ void cluster_client_t::erase_op(cluster_op_t *op)
     {
         // Call callback at the end to avoid inconsistencies in prev_wait
         // if the callback adds more operations itself
-        std::function<void(cluster_op_t*)>(op->callback)(op);
+        auto cb = std::move(op->callback);
+        cb(op);
     }
     if (flags & OP_FLUSH_BUFFER)
     {
@@ -265,7 +267,7 @@ void cluster_client_t::erase_op(cluster_op_t *op)
     }
 }
 
-void cluster_client_t::continue_ops(bool up_retry)
+void cluster_client_t::continue_ops(int time_passed)
 {
     if (!pgs_loaded)
     {
@@ -277,22 +279,27 @@ void cluster_client_t::continue_ops(bool up_retry)
         // Attempt to reenter the function
         return;
     }
+    int reset_duration = 0;
 restart:
     continuing_ops = 1;
     for (auto op = op_queue_head; op; )
     {
         cluster_op_t *next_op = op->next;
-        if (!op->up_wait || up_retry)
+        if (op->retry_after && time_passed)
         {
-            op->up_wait = false;
-            if (!op->prev_wait)
+            op->retry_after = op->retry_after > time_passed ? op->retry_after-time_passed : 0;
+            if (op->retry_after && (!reset_duration || op->retry_after < reset_duration))
             {
-                if (op->opcode == OSD_OP_SYNC)
-                    continue_sync(op);
-                else
-                    continue_rw(op);
+                reset_duration = op->retry_after;
             }
         }
+        if (!op->retry_after && !op->prev_wait)
+        {
+            if (op->opcode == OSD_OP_SYNC)
+                continue_sync(op);
+            else
+                continue_rw(op);
+        }
         op = next_op;
         if (continuing_ops == 2)
         {
@@ -300,6 +307,27 @@ restart:
         }
     }
     continuing_ops = 0;
+    reset_retry_timer(reset_duration);
+}
+
+void cluster_client_t::reset_retry_timer(int new_duration)
+{
+    if (retry_timeout_duration && retry_timeout_duration <= new_duration || !new_duration)
+    {
+        return;
+    }
+    if (retry_timeout_id)
+    {
+        tfd->clear_timer(retry_timeout_id);
+    }
+    retry_timeout_duration = new_duration;
+    retry_timeout_id = tfd->set_timer(retry_timeout_duration, false, [this](int)
+    {
+        int time_passed = retry_timeout_duration;
+        retry_timeout_id = 0;
+        retry_timeout_duration = 0;
+        continue_ops(time_passed);
+    });
 }
 
 void cluster_client_t::on_load_config_hook(json11::Json::object & etcd_global_config)
@@ -349,15 +377,25 @@ void cluster_client_t::on_load_config_hook(json11::Json::object & etcd_global_co
     {
         client_max_writeback_iodepth = DEFAULT_CLIENT_MAX_WRITEBACK_IODEPTH;
     }
-    // up_wait_retry_interval
-    up_wait_retry_interval = config["up_wait_retry_interval"].uint64_value();
-    if (!up_wait_retry_interval)
+    // client_retry_interval
+    client_retry_interval = config["client_retry_interval"].uint64_value();
+    if (!client_retry_interval)
     {
-        up_wait_retry_interval = 50;
+        client_retry_interval = 50;
     }
-    else if (up_wait_retry_interval < 10)
+    else if (client_retry_interval < 10)
     {
-        up_wait_retry_interval = 10;
+        client_retry_interval = 10;
+    }
+    // client_eio_retry_interval
+    client_eio_retry_interval = 1000;
+    if (!config["client_eio_retry_interval"].is_null())
+    {
+        client_eio_retry_interval = config["client_eio_retry_interval"].uint64_value();
+        if (client_eio_retry_interval && client_eio_retry_interval < 10)
+        {
+            client_eio_retry_interval = 10;
+        }
     }
     // log_level
     log_level = config["log_level"].uint64_value();
@@ -512,7 +550,8 @@ void cluster_client_t::execute(cluster_op_t *op)
         op->opcode != OSD_OP_READ_BITMAP && op->opcode != OSD_OP_READ_CHAIN_BITMAP && op->opcode != OSD_OP_WRITE)
     {
         op->retval = -EINVAL;
-        std::function<void(cluster_op_t*)>(op->callback)(op);
+        auto cb = std::move(op->callback);
+        cb(op);
         return;
     }
     if (!pgs_loaded)
@@ -534,7 +573,7 @@ void cluster_client_t::execute_internal(cluster_op_t *op)
         return;
     }
     if (op->opcode == OSD_OP_WRITE && enable_writeback && !(op->flags & OP_FLUSH_BUFFER) &&
-        !op->version /* FIXME no CAS writeback */)
+        !op->version /* no CAS writeback */)
     {
         if (wb->writebacks_active >= client_max_writeback_iodepth)
         {
@@ -550,12 +589,13 @@ void cluster_client_t::execute_internal(cluster_op_t *op)
             wb->start_writebacks(this, 1);
         }
         op->retval = op->len;
-        std::function<void(cluster_op_t*)>(op->callback)(op);
+        auto cb = std::move(op->callback);
+        cb(op);
         return;
     }
     if (op->opcode == OSD_OP_WRITE && !(op->flags & OP_IMMEDIATE_COMMIT))
     {
-        if (!(op->flags & OP_FLUSH_BUFFER))
+        if (!(op->flags & OP_FLUSH_BUFFER) && !op->version /* no CAS write-repeat */)
         {
             wb->copy_write(op, CACHE_WRITTEN);
         }
@@ -619,7 +659,8 @@ bool cluster_client_t::check_rw(cluster_op_t *op)
     if (!pool_id)
     {
         op->retval = -EINVAL;
-        std::function<void(cluster_op_t*)>(op->callback)(op);
+        auto cb = std::move(op->callback);
+        cb(op);
         return false;
     }
     auto pool_it = st_cli.pool_config.find(pool_id);
@@ -627,15 +668,17 @@ bool cluster_client_t::check_rw(cluster_op_t *op)
     {
         // Pools are loaded, but this one is unknown
         op->retval = -EINVAL;
-        std::function<void(cluster_op_t*)>(op->callback)(op);
+        auto cb = std::move(op->callback);
+        cb(op);
         return false;
     }
     // Check alignment
-    if (!op->len && (op->opcode == OSD_OP_READ || op->opcode == OSD_OP_READ_BITMAP || op->opcode == OSD_OP_READ_CHAIN_BITMAP || op->opcode == OSD_OP_WRITE) ||
+    if (!op->len && (op->opcode == OSD_OP_READ_BITMAP || op->opcode == OSD_OP_READ_CHAIN_BITMAP || op->opcode == OSD_OP_WRITE) ||
         op->offset % pool_it->second.bitmap_granularity || op->len % pool_it->second.bitmap_granularity)
     {
         op->retval = -EINVAL;
-        std::function<void(cluster_op_t*)>(op->callback)(op);
+        auto cb = std::move(op->callback);
+        cb(op);
         return false;
     }
     if (pool_it->second.immediate_commit == IMMEDIATE_ALL)
@@ -648,7 +691,8 @@ bool cluster_client_t::check_rw(cluster_op_t *op)
         if (ino_it != st_cli.inode_config.end() && ino_it->second.readonly)
         {
             op->retval = -EROFS;
-            std::function<void(cluster_op_t*)>(op->callback)(op);
+            auto cb = std::move(op->callback);
+            cb(op);
             return false;
         }
     }
@@ -716,15 +760,8 @@ resume_1:
                 // We'll need to retry again
                 if (op->parts[i].flags & PART_RETRY)
                 {
-                    op->up_wait = true;
-                    if (!retry_timeout_id)
-                    {
-                        retry_timeout_id = tfd->set_timer(up_wait_retry_interval, false, [this](int)
-                        {
-                            retry_timeout_id = 0;
-                            continue_ops(true);
-                        });
-                    }
+                    op->retry_after = client_retry_interval;
+                    reset_retry_timer(client_retry_interval);
                 }
                 op->state = 1;
             }
@@ -780,10 +817,9 @@ resume_2:
         return 1;
     }
     else if (op->retval != 0 && !(op->flags & OP_FLUSH_BUFFER) &&
-        op->retval != -EPIPE && op->retval != -EIO && op->retval != -ENOSPC)
+        op->retval != -EPIPE && (op->retval != -EIO || !client_eio_retry_interval) && op->retval != -ENOSPC)
     {
         // Fatal error (neither -EPIPE, -EIO nor -ENOSPC)
-        // FIXME: Add a parameter to allow to not wait for EIOs (incomplete or corrupted objects) to heal
         erase_op(op);
         return 1;
     }
@@ -1138,7 +1174,6 @@ static inline void mem_or(void *res, const void *r2, unsigned int len)
 void cluster_client_t::handle_op_part(cluster_op_part_t *part)
 {
     cluster_op_t *op = part->parent;
-    op->inflight_count--;
     int expected = part->op.req.hdr.opcode == OSD_OP_SYNC ? 0 : part->op.req.rw.len;
     if (part->op.reply.hdr.retval != expected)
     {
@@ -1161,7 +1196,7 @@ void cluster_client_t::handle_op_part(cluster_op_part_t *part)
                 );
             }
         }
-        else
+        else if (log_level > 0)
         {
             fprintf(
                 stderr, "%s operation failed on OSD %ju: retval=%jd (expected %d)\n",
@@ -1171,16 +1206,17 @@ void cluster_client_t::handle_op_part(cluster_op_part_t *part)
         // All next things like timer, continue_sync/rw and stop_client may affect the operation again
         // So do all these things after modifying operation state, otherwise we may hit reenterability bugs
         // FIXME postpone such things to set_immediate here to avoid bugs
-        // Mark op->up_wait = true to retry operation after a short pause (not immediately)
-        op->up_wait = true;
-        if (!retry_timeout_id)
+        // Set op->retry_after to retry operation after a short pause (not immediately)
+        if (!op->retry_after)
         {
-            retry_timeout_id = tfd->set_timer(up_wait_retry_interval, false, [this](int)
-            {
-                retry_timeout_id = 0;
-                continue_ops(true);
-            });
+            op->retry_after = op->retval == -EIO ? client_eio_retry_interval : client_retry_interval;
         }
+        reset_retry_timer(op->retry_after);
+        if (stop_fd >= 0)
+        {
+            msgr.stop_client(stop_fd);
+        }
+        op->inflight_count--;
         if (op->inflight_count == 0)
         {
             if (op->opcode == OSD_OP_SYNC)
@@ -1188,14 +1224,11 @@ void cluster_client_t::handle_op_part(cluster_op_part_t *part)
             else
                 continue_rw(op);
         }
-        if (stop_fd >= 0)
-        {
-            msgr.stop_client(stop_fd);
-        }
     }
     else
     {
         // OK
+        op->inflight_count--;
         if ((op->opcode == OSD_OP_WRITE || op->opcode == OSD_OP_DELETE) && !(op->flags & OP_IMMEDIATE_COMMIT))
             dirty_osds.insert(part->osd_num);
         part->flags |= PART_DONE;

src/cluster_client.h

@@ -59,7 +59,7 @@ protected:
     void *buf = NULL;
     cluster_op_t *orig_op = NULL;
     bool needs_reslice = false;
-    bool up_wait = false;
+    int retry_after = 0;
     int inflight_count = 0, done_count = 0;
     std::vector<cluster_op_part_t> parts;
     void *part_bitmaps = NULL;
@@ -92,9 +92,11 @@ class cluster_client_t
     uint64_t client_max_writeback_iodepth = 0;
 
     int log_level = 0;
-    int up_wait_retry_interval = 500; // ms
+    int client_retry_interval = 50; // ms
+    int client_eio_retry_interval = 1000; // ms
 
     int retry_timeout_id = 0;
+    int retry_timeout_duration = 0;
     std::vector<cluster_op_t*> offline_ops;
     cluster_op_t *op_queue_head = NULL, *op_queue_tail = NULL;
     writeback_cache_t *wb = NULL;
@@ -121,7 +123,7 @@ public:
     json11::Json::object cli_config, file_config, etcd_global_config;
     json11::Json::object config;
 
-    cluster_client_t(ring_loop_t *ringloop, timerfd_manager_t *tfd, json11::Json & config);
+    cluster_client_t(ring_loop_t *ringloop, timerfd_manager_t *tfd, json11::Json config);
     ~cluster_client_t();
     void execute(cluster_op_t *op);
     void execute_raw(osd_num_t osd_num, osd_op_t *op);
@@ -131,7 +133,7 @@ public:
 
     bool get_immediate_commit(uint64_t inode);
 
-    void continue_ops(bool up_retry = false);
+    void continue_ops(int time_passed = 0);
     inode_list_t *list_inode_start(inode_t inode,
         std::function<void(inode_list_t* lst, std::set<object_id>&& objects, pg_num_t pg_num, osd_num_t primary_osd, int status)> callback);
     int list_pg_count(inode_list_t *lst);
@@ -152,6 +154,7 @@ protected:
     int continue_rw(cluster_op_t *op);
     bool check_rw(cluster_op_t *op);
     void slice_rw(cluster_op_t *op);
+    void reset_retry_timer(int new_duration);
     bool try_send(cluster_op_t *op, int i);
     int continue_sync(cluster_op_t *op);
     void send_sync(cluster_op_t *op, cluster_op_part_t *part);

src/disk_simple_offsets.cpp

@@ -16,11 +16,6 @@
 void disk_tool_simple_offsets(json11::Json cfg, bool json_output)
 {
     std::string device = cfg["device"].string_value();
-    if (device == "")
-    {
-        fprintf(stderr, "Device path is missing\n");
-        exit(1);
-    }
     uint64_t data_block_size = parse_size(cfg["object_size"].string_value());
     uint64_t bitmap_granularity = parse_size(cfg["bitmap_granularity"].string_value());
     uint64_t journal_size = parse_size(cfg["journal_size"].string_value());
@@ -57,6 +52,11 @@ void disk_tool_simple_offsets(json11::Json cfg, bool json_output)
     uint64_t orig_device_size = device_size;
     if (!device_size)
     {
+        if (device == "")
+        {
+            fprintf(stderr, "Device path is missing\n");
+            exit(1);
+        }
         struct stat st;
         if (stat(device.c_str(), &st) < 0)
         {

src/disk_tool.cpp

@@ -60,7 +60,7 @@ static const char *help_text =
     "    --block_size 128k/1M       Set blockstore object size\n"
     "    --bitmap_granularity 4k    Set bitmap granularity\n"
     "    --data_csum_type none      Set data checksum type (crc32c or none)\n"
-    "    --csum_block_size 4k       Set data checksum block size\n"
+    "    --csum_block_size 4k/32k   Set data checksum block size (SSD/HDD default)\n"
     "    --data_device_block 4k     Override data device block size\n"
     "    --meta_device_block 4k     Override metadata device block size\n"
     "    --journal_device_block 4k  Override journal device block size\n"

src/disk_tool.h

@@ -132,9 +132,6 @@ void disk_tool_simple_offsets(json11::Json cfg, bool json_output);
 
 uint64_t sscanf_json(const char *fmt, const json11::Json & str);
 void fromhexstr(const std::string & from, int bytes, uint8_t *to);
-std::string realpath_str(std::string path, bool nofail = true);
-std::string read_all_fd(int fd);
-std::string read_file(std::string file, bool allow_enoent = false);
 int disable_cache(std::string dev);
 std::string get_parent_device(std::string dev);
 bool json_is_true(const json11::Json & val);

src/disk_tool_prepare.cpp

@@ -111,6 +111,8 @@ int disk_tool_t::prepare_one(std::map<std::string, std::string> options, int is_
             options["block_size"] = "1M";
         if (is_hybrid && options["throttle_small_writes"] == "")
             options["throttle_small_writes"] = "1";
+        if (!is_hybrid && options.find("data_csum_type") != options.end() && options.at("data_csum_type") != "")
+            options["csum_block_size"] = "32k";
     }
     else if (!json_is_true(options["disable_data_fsync"]))
     {

src/disk_tool_utils.cpp

@@ -42,36 +42,6 @@ void fromhexstr(const std::string & from, int bytes, uint8_t *to)
     }
 }
 
-std::string realpath_str(std::string path, bool nofail)
-{
-    char *p = realpath((char*)path.c_str(), NULL);
-    if (!p)
-    {
-        fprintf(stderr, "Failed to resolve %s: %s\n", path.c_str(), strerror(errno));
-        return nofail ? path : "";
-    }
-    std::string rp(p);
-    free(p);
-    return rp;
-}
-
-std::string read_file(std::string file, bool allow_enoent)
-{
-    std::string res;
-    int fd = open(file.c_str(), O_RDONLY);
-    if (fd < 0 || (res = read_all_fd(fd)) == "")
-    {
-        int err = errno;
-        if (fd >= 0)
-            close(fd);
-        if (!allow_enoent || err != ENOENT)
-            fprintf(stderr, "Can't read %s: %s\n", file.c_str(), strerror(err));
-        return "";
-    }
-    close(fd);
-    return res;
-}
-
 // returns 1 = check error, 0 = write through, -1 = write back
 // (similar to 1 = warning, -1 = error, 0 = success in disable_cache)
 static int check_queue_cache(std::string dev, std::string parent_dev)

src/epoll_manager.cpp

@@ -101,7 +101,7 @@ void epoll_manager_t::handle_uring_event()
     my_uring_prep_poll_add(sqe, epoll_fd, POLLIN);
     data->callback = [this](ring_data_t *data)
     {
-        if (data->res < 0)
+        if (data->res < 0 && data->res != -ECANCELED)
         {
             throw std::runtime_error(std::string("epoll failed: ") + strerror(-data->res));
         }

src/etcd_state_client.cpp

@@ -573,8 +573,7 @@ void etcd_state_client_t::load_global_config()
         {
             global_bitmap_granularity = DEFAULT_BITMAP_GRANULARITY;
         }
-        global_immediate_commit = global_config["immediate_commit"].string_value() == "all"
-            ? IMMEDIATE_ALL : (global_config["immediate_commit"].string_value() == "small" ? IMMEDIATE_SMALL : IMMEDIATE_NONE);
+        global_immediate_commit = parse_immediate_commit(global_config["immediate_commit"].string_value());
         on_load_config_hook(global_config);
     });
 }
@@ -782,13 +781,8 @@ void etcd_state_client_t::parse_state(const etcd_kv_t & kv)
             // Failure Domain
             pc.failure_domain = pool_item.second["failure_domain"].string_value();
             // Coding Scheme
-            if (pool_item.second["scheme"] == "replicated")
-                pc.scheme = POOL_SCHEME_REPLICATED;
-            else if (pool_item.second["scheme"] == "xor")
-                pc.scheme = POOL_SCHEME_XOR;
-            else if (pool_item.second["scheme"] == "ec" || pool_item.second["scheme"] == "jerasure")
-                pc.scheme = POOL_SCHEME_EC;
-            else
+            pc.scheme = parse_scheme(pool_item.second["scheme"].string_value());
+            if (!pc.scheme)
             {
                 fprintf(stderr, "Pool %u has invalid coding scheme (one of \"xor\", \"replicated\", \"ec\" or \"jerasure\" required), skipping pool\n", pool_id);
                 continue;
@@ -869,11 +863,11 @@ void etcd_state_client_t::parse_state(const etcd_kv_t & kv)
             pc.scrub_interval = parse_time(pool_item.second["scrub_interval"].string_value());
             if (!pc.scrub_interval)
                 pc.scrub_interval = 0;
+            // Mark pool as VitastorFS pool (disable per-inode stats and block volume creation)
+            pc.used_for_fs = pool_item.second["used_for_fs"].as_string();
             // Immediate Commit Mode
             pc.immediate_commit = pool_item.second["immediate_commit"].is_string()
-                ? (pool_item.second["immediate_commit"].string_value() == "all"
-                    ? IMMEDIATE_ALL : (pool_item.second["immediate_commit"].string_value() == "small"
-                        ? IMMEDIATE_SMALL : IMMEDIATE_NONE))
+                ? parse_immediate_commit(pool_item.second["immediate_commit"].string_value())
                 : global_immediate_commit;
             // PG Stripe Size
             pc.pg_stripe_size = pool_item.second["pg_stripe_size"].uint64_value();
@@ -1167,6 +1161,23 @@ void etcd_state_client_t::parse_state(const etcd_kv_t & kv)
     }
 }
 
+uint32_t etcd_state_client_t::parse_immediate_commit(const std::string & immediate_commit_str)
+{
+    return immediate_commit_str == "all" ? IMMEDIATE_ALL :
+        (immediate_commit_str == "small" ? IMMEDIATE_SMALL : IMMEDIATE_NONE);
+}
+
+uint32_t etcd_state_client_t::parse_scheme(const std::string & scheme)
+{
+    if (scheme == "replicated")
+        return POOL_SCHEME_REPLICATED;
+    else if (scheme == "xor")
+        return POOL_SCHEME_XOR;
+    else if (scheme == "ec" || scheme == "jerasure")
+        return POOL_SCHEME_EC;
+    return 0;
+}
+
 void etcd_state_client_t::insert_inode_config(const inode_config_t & cfg)
 {
     this->inode_config[cfg.num] = cfg;

src/etcd_state_client.h

@@ -60,6 +60,7 @@ struct pool_config_t
     uint64_t pg_stripe_size;
     std::map<pg_num_t, pg_config_t> pg_config;
     uint64_t scrub_interval;
+    std::string used_for_fs;
 };
 
 struct inode_config_t
@@ -151,4 +152,7 @@ public:
     void close_watch(inode_watch_t* watch);
     int address_count();
     ~etcd_state_client_t();
+
+    static uint32_t parse_immediate_commit(const std::string & immediate_commit_str);
+    static uint32_t parse_scheme(const std::string & scheme_str);
 };

src/kv_cli.cpp

@@ -0,0 +1,673 @@
+// Copyright (c) Vitaliy Filippov, 2019+
+// License: VNPL-1.1 (see README.md for details)
+//
+// Vitastor shared key/value database test CLI
+
+#define _XOPEN_SOURCE
+#include <limits.h>
+
+#include <netinet/tcp.h>
+#include <sys/epoll.h>
+#include <unistd.h>
+#include <fcntl.h>
+//#include <signal.h>
+
+#include "epoll_manager.h"
+#include "str_util.h"
+#include "kv_db.h"
+
+const char *exe_name = NULL;
+
+class kv_cli_t
+{
+public:
+    json11::Json::object cfg;
+    std::vector<std::string> cli_cmd;
+
+    kv_dbw_t *db = NULL;
+    ring_loop_t *ringloop = NULL;
+    epoll_manager_t *epmgr = NULL;
+    cluster_client_t *cli = NULL;
+    int load_parallelism = 16;
+    bool opened = false;
+    bool interactive = false, is_file = false;
+    int in_progress = 0;
+    char *cur_cmd = NULL;
+    int cur_cmd_size = 0, cur_cmd_alloc = 0;
+    bool finished = false, eof = false;
+
+    std::function<void(int)> load_cb;
+    bool loading_json = false, in_loadjson = false;
+    int load_state = 0;
+    std::string load_key;
+
+    ~kv_cli_t();
+
+    void parse_args(int narg, const char *args[]);
+    void run();
+    void read_cmd();
+    void next_cmd();
+    std::vector<std::string> parse_cmd(const std::string & cmdstr);
+    void handle_cmd(const std::vector<std::string> & cmd, std::function<void(int)> cb);
+    void loadjson();
+};
+
+kv_cli_t::~kv_cli_t()
+{
+    if (cur_cmd)
+    {
+        free(cur_cmd);
+        cur_cmd = NULL;
+    }
+    cur_cmd_alloc = 0;
+    if (db)
+        delete db;
+    if (cli)
+    {
+        cli->flush();
+        delete cli;
+    }
+    if (epmgr)
+        delete epmgr;
+    if (ringloop)
+        delete ringloop;
+}
+
+void kv_cli_t::parse_args(int narg, const char *args[])
+{
+    bool db = false;
+    for (int i = 1; i < narg; i++)
+    {
+        if (!strcmp(args[i], "-h") || !strcmp(args[i], "--help"))
+        {
+            printf(
+                "Vitastor Key/Value CLI\n"
+                "(c) Vitaliy Filippov, 2023+ (VNPL-1.1)\n"
+                "\n"
+                "USAGE: %s [OPTIONS] [<IMAGE> [<COMMAND>]]\n"
+                "\n"
+                "COMMANDS:\n"
+                "  get <key>\n"
+                "  set <key> <value>\n"
+                "  del <key>\n"
+                "  list [<start> [end]]\n"
+                "  dump [<start> [end]]\n"
+                "  dumpjson [<start> [end]]\n"
+                "  loadjson\n"
+                "\n"
+                "<IMAGE> should be the name of Vitastor image with the DB.\n"
+                "Without <COMMAND>, you get an interactive DB shell.\n"
+                "\n"
+                "OPTIONS:\n"
+                "  --kv_block_size 4k\n"
+                "    Key-value B-Tree block size\n"
+                "  --kv_memory_limit 128M\n"
+                "    Maximum memory to use for vitastor-kv index cache\n"
+                "  --kv_allocate_blocks 4\n"
+                "    Number of PG blocks used for new tree block allocation in parallel\n"
+                "  --kv_evict_max_misses 10\n"
+                "    Eviction algorithm parameter: retry eviction from another random spot\n"
+                "    if this number of keys is used currently or was used recently\n"
+                "  --kv_evict_attempts_per_level 3\n"
+                "    Retry eviction at most this number of times per tree level, starting\n"
+                "    with bottom-most levels\n"
+                "  --kv_evict_unused_age 1000\n"
+                "    Evict only keys unused during this number of last operations\n"
+                "  --kv_log_level 1\n"
+                "    Log level. 0 = errors, 1 = warnings, 10 = trace operations\n"
+                ,
+                exe_name
+            );
+            exit(0);
+        }
+        else if (args[i][0] == '-' && args[i][1] == '-')
+        {
+            const char *opt = args[i]+2;
+            cfg[opt] = !strcmp(opt, "json") || i == narg-1 ? "1" : args[++i];
+        }
+        else if (!db)
+        {
+            cfg["db"] = args[i];
+            db = true;
+        }
+        else
+        {
+            cli_cmd.push_back(args[i]);
+        }
+    }
+}
+
+void kv_cli_t::run()
+{
+    // Create client
+    ringloop = new ring_loop_t(512);
+    epmgr = new epoll_manager_t(ringloop);
+    cli = new cluster_client_t(ringloop, epmgr->tfd, cfg);
+    db = new kv_dbw_t(cli);
+    // Load image metadata
+    while (!cli->is_ready())
+    {
+        ringloop->loop();
+        if (cli->is_ready())
+            break;
+        ringloop->wait();
+    }
+    // Open if DB is set in options
+    if (cfg.find("db") != cfg.end())
+    {
+        bool done = false;
+        handle_cmd({ "open", cfg.at("db").string_value() }, [&done](int res) { if (res != 0) exit(1); done = true; });
+        while (!done)
+        {
+            ringloop->loop();
+            if (done)
+                break;
+            ringloop->wait();
+        }
+    }
+    // Run single command from CLI
+    if (cli_cmd.size())
+    {
+        bool done = false;
+        handle_cmd(cli_cmd, [&done](int res) { if (res != 0) exit(1); done = true; });
+        while (!done)
+        {
+            ringloop->loop();
+            if (done)
+                break;
+            ringloop->wait();
+        }
+    }
+    else
+    {
+        // Run interactive shell
+        fcntl(0, F_SETFL, fcntl(0, F_GETFL, 0) | O_NONBLOCK);
+        try
+        {
+            epmgr->tfd->set_fd_handler(0, false, [this](int fd, int events)
+            {
+                if (events & EPOLLIN)
+                {
+                    read_cmd();
+                }
+                if (events & EPOLLRDHUP)
+                {
+                    epmgr->tfd->set_fd_handler(0, false, NULL);
+                    finished = true;
+                }
+            });
+            interactive = isatty(0);
+            if (interactive)
+                printf("> ");
+        }
+        catch (std::exception & e)
+        {
+            // Can't add to epoll, STDIN is probably a file
+            is_file = true;
+            read_cmd();
+        }
+        while (!finished)
+        {
+            ringloop->loop();
+            if (!finished)
+                ringloop->wait();
+        }
+    }
+    // Destroy the client
+    delete db;
+    db = NULL;
+    cli->flush();
+    delete cli;
+    delete epmgr;
+    delete ringloop;
+    cli = NULL;
+    epmgr = NULL;
+    ringloop = NULL;
+}
+
+void kv_cli_t::read_cmd()
+{
+    if (!cur_cmd_alloc)
+    {
+        cur_cmd_alloc = 65536;
+        cur_cmd = (char*)malloc_or_die(cur_cmd_alloc);
+    }
+    while (cur_cmd_size < cur_cmd_alloc)
+    {
+        int r = read(0, cur_cmd+cur_cmd_size, cur_cmd_alloc-cur_cmd_size);
+        if (r < 0 && errno != EAGAIN)
+            fprintf(stderr, "Error reading from stdin: %s\n", strerror(errno));
+        if (r > 0)
+            cur_cmd_size += r;
+        if (r == 0)
+            eof = true;
+        if (r <= 0)
+            break;
+    }
+    next_cmd();
+}
+
+void kv_cli_t::next_cmd()
+{
+    if (loading_json)
+    {
+        loadjson();
+        return;
+    }
+    if (in_progress > 0)
+    {
+        return;
+    }
+    int pos = 0;
+    for (; pos < cur_cmd_size; pos++)
+    {
+        if (cur_cmd[pos] == '\n' || cur_cmd[pos] == '\r')
+        {
+            auto cmd = trim(std::string(cur_cmd, pos));
+            pos++;
+            memmove(cur_cmd, cur_cmd+pos, cur_cmd_size-pos);
+            cur_cmd_size -= pos;
+            in_progress++;
+            handle_cmd(parse_cmd(cmd), [this](int res)
+            {
+                in_progress--;
+                if (interactive)
+                    printf("> ");
+                next_cmd();
+                if (!in_progress)
+                    read_cmd();
+            });
+            break;
+        }
+    }
+    if (eof && !in_progress)
+    {
+        finished = true;
+    }
+}
+
+struct kv_cli_list_t
+{
+    kv_dbw_t *db = NULL;
+    void *handle = NULL;
+    int format = 0;
+    int n = 0;
+    std::function<void(int)> cb;
+};
+
+std::vector<std::string> kv_cli_t::parse_cmd(const std::string & str)
+{
+    std::vector<std::string> res;
+    size_t pos = 0;
+    auto cmd = scan_escaped(str, pos);
+    if (cmd.empty())
+        return res;
+    res.push_back(cmd);
+    int max_args = (cmd == "set" || cmd == "config" ||
+        cmd == "list" || cmd == "dump" || cmd == "dumpjson" ? 3 :
+        (cmd == "open" || cmd == "get" || cmd == "del" ? 2 : 1));
+    while (pos < str.size() && res.size() < max_args)
+    {
+        if (res.size() == max_args-1)
+        {
+            // Allow unquoted last argument
+            pos = str.find_first_not_of(" \t\r\n", pos);
+            if (pos == std::string::npos)
+                break;
+            if (str[pos] != '"' && str[pos] != '\'')
+            {
+                res.push_back(trim(str.substr(pos)));
+                break;
+            }
+        }
+        auto arg = scan_escaped(str, pos);
+        if (arg.size())
+            res.push_back(arg);
+    }
+    return res;
+}
+
+void kv_cli_t::loadjson()
+{
+    // simple streaming json parser
+    if (in_progress >= load_parallelism || in_loadjson)
+    {
+        return;
+    }
+    in_loadjson = true;
+    if (load_state == 5)
+    {
+st_5:
+        if (!in_progress)
+        {
+            loading_json = false;
+            auto cb = std::move(load_cb);
+            cb(0);
+        }
+        in_loadjson = false;
+        return;
+    }
+    do
+    {
+        read_cmd();
+        size_t pos = 0;
+        while (true)
+        {
+            while (pos < cur_cmd_size && is_white(cur_cmd[pos]))
+            {
+                pos++;
+            }
+            if (pos >= cur_cmd_size)
+            {
+                break;
+            }
+            if (load_state == 0 || load_state == 2)
+            {
+                char expected = "{ :"[load_state];
+                if (cur_cmd[pos] != expected)
+                {
+                    fprintf(stderr, "Unexpected %c, expected %c\n", cur_cmd[pos], expected);
+                    exit(1);
+                }
+                pos++;
+                load_state++;
+            }
+            else if (load_state == 1 || load_state == 3)
+            {
+                if (cur_cmd[pos] != '"')
+                {
+                    fprintf(stderr, "Unexpected %c, expected \"\n", cur_cmd[pos]);
+                    exit(1);
+                }
+                size_t prev = pos;
+                auto str = scan_escaped(cur_cmd, cur_cmd_size, pos, false);
+                if (pos == prev)
+                {
+                    break;
+                }
+                load_state++;
+                if (load_state == 2)
+                {
+                    load_key = str;
+                }
+                else
+                {
+                    in_progress++;
+                    handle_cmd({ "set", load_key, str }, [this](int res)
+                    {
+                        in_progress--;
+                        next_cmd();
+                    });
+                    if (in_progress >= load_parallelism)
+                    {
+                        break;
+                    }
+                }
+            }
+            else if (load_state == 4)
+            {
+                if (cur_cmd[pos] == ',')
+                {
+                    pos++;
+                    load_state = 1;
+                }
+                else if (cur_cmd[pos] == '}')
+                {
+                    pos++;
+                    load_state = 5;
+                    goto st_5;
+                }
+                else
+                {
+                    fprintf(stderr, "Unexpected %c, expected , or }\n", cur_cmd[pos]);
+                    exit(1);
+                }
+            }
+        }
+        if (pos < cur_cmd_size)
+        {
+            memmove(cur_cmd, cur_cmd+pos, cur_cmd_size-pos);
+        }
+        cur_cmd_size -= pos;
+    } while (loading_json && is_file);
+    in_loadjson = false;
+}
+
+void kv_cli_t::handle_cmd(const std::vector<std::string> & cmd, std::function<void(int)> cb)
+{
+    if (!cmd.size())
+    {
+        cb(-EINVAL);
+        return;
+    }
+    auto & opname = cmd[0];
+    if (!opened && opname != "open" && opname != "config" && opname != "quit" && opname != "q")
+    {
+        fprintf(stderr, "Error: database not opened\n");
+        cb(-EINVAL);
+        return;
+    }
+    if (opname == "open")
+    {
+        auto name = cmd.size() > 1 ? cmd[1] : "";
+        uint64_t pool_id = 0;
+        inode_t inode_id = 0;
+        int scanned = sscanf(name.c_str(), "%lu %lu", &pool_id, &inode_id);
+        if (scanned < 2 || !pool_id || !inode_id)
+        {
+            inode_id = 0;
+            name = trim(name);
+            for (auto & ic: cli->st_cli.inode_config)
+            {
+                if (ic.second.name == name)
+                {
+                    inode_id = ic.first;
+                    break;
+                }
+            }
+            if (!inode_id)
+            {
+                fprintf(stderr, "Usage: open <image> OR open <pool_id> <inode_id>\n");
+                cb(-EINVAL);
+                return;
+            }
+        }
+        else
+            inode_id = INODE_WITH_POOL(pool_id, inode_id);
+        db->open(inode_id, cfg, [=](int res)
+        {
+            if (res < 0)
+            {
+                fprintf(stderr, "Error opening index: %s (code %d)\n", strerror(-res), res);
+            }
+            else
+            {
+                opened = true;
+                fprintf(interactive ? stdout : stderr, "Index opened. Current size: %lu bytes\n", db->get_size());
+            }
+            cb(res);
+        });
+    }
+    else if (opname == "config")
+    {
+        if (cmd.size() < 3)
+        {
+            fprintf(stderr, "Usage: config <property> <value>\n");
+            cb(-EINVAL);
+            return;
+        }
+        auto & key = cmd[1];
+        auto & value = cmd[2];
+        if (key != "kv_memory_limit" &&
+            key != "kv_allocate_blocks" &&
+            key != "kv_evict_max_misses" &&
+            key != "kv_evict_attempts_per_level" &&
+            key != "kv_evict_unused_age" &&
+            key != "kv_log_level" &&
+            key != "kv_block_size")
+        {
+            fprintf(
+                stderr, "Allowed properties: kv_block_size, kv_memory_limit, kv_allocate_blocks,"
+                " kv_evict_max_misses, kv_evict_attempts_per_level, kv_evict_unused_age, kv_log_level\n"
+            );
+            cb(-EINVAL);
+        }
+        else if (key == "kv_block_size")
+        {
+            if (opened)
+            {
+                fprintf(stderr, "kv_block_size can't be set after opening DB\n");
+                cb(-EINVAL);
+            }
+            else
+            {
+                cfg[key] = value;
+                cb(0);
+            }
+        }
+        else
+        {
+            cfg[key] = value;
+            db->set_config(cfg);
+            cb(0);
+        }
+    }
+    else if (opname == "get" || opname == "set" || opname == "del")
+    {
+        if (opname == "get" || opname == "del")
+        {
+            if (cmd.size() < 2)
+            {
+                fprintf(stderr, "Usage: %s <key>\n", opname.c_str());
+                cb(-EINVAL);
+                return;
+            }
+            auto & key = cmd[1];
+            if (opname == "get")
+            {
+                db->get(key, [this, cb](int res, const std::string & value)
+                {
+                    if (res < 0)
+                        fprintf(stderr, "Error: %s (code %d)\n", strerror(-res), res);
+                    else
+                    {
+                        if (write(1, value.c_str(), value.size()) < 0 || write(1, "\n", 1) < 0)
+                            exit(1);
+                    }
+                    cb(res);
+                });
+            }
+            else
+            {
+                db->del(key, [this, cb](int res)
+                {
+                    if (res < 0)
+                        fprintf(stderr, "Error: %s (code %d)\n", strerror(-res), res);
+                    else
+                        fprintf(interactive ? stdout : stderr, "OK\n");
+                    cb(res);
+                });
+            }
+        }
+        else
+        {
+            if (cmd.size() < 3)
+            {
+                fprintf(stderr, "Usage: set <key> <value>\n");
+                cb(-EINVAL);
+                return;
+            }
+            auto & key = cmd[1];
+            auto & value = cmd[2];
+            db->set(key, value, [this, cb, l = loading_json](int res)
+            {
+                if (res < 0)
+                    fprintf(stderr, "Error: %s (code %d)\n", strerror(-res), res);
+                else if (!l)
+                    fprintf(interactive ? stdout : stderr, "OK\n");
+                cb(res);
+            });
+        }
+    }
+    else if (opname == "list" || opname == "dump" || opname == "dumpjson")
+    {
+        kv_cli_list_t *lst = new kv_cli_list_t;
+        std::string start = cmd.size() >= 2 ? cmd[1] : "";
+        std::string end = cmd.size() >= 3 ? cmd[2] : "";
+        lst->handle = db->list_start(start);
+        lst->db = db;
+        lst->format = opname == "dump" ? 1 : (opname == "dumpjson" ? 2 : 0);
+        lst->cb = std::move(cb);
+        db->list_next(lst->handle, [lst](int res, const std::string & key, const std::string & value)
+        {
+            if (res < 0)
+            {
+                if (res != -ENOENT)
+                {
+                    fprintf(stderr, "Error: %s (code %d)\n", strerror(-res), res);
+                }
+                if (lst->format == 2)
+                    printf("\n}\n");
+                lst->db->list_close(lst->handle);
+                lst->cb(res == -ENOENT ? 0 : res);
+                delete lst;
+            }
+            else
+            {
+                if (lst->format == 2)
+                    printf(lst->n ? ",\n  %s: %s" : "{\n  %s: %s", addslashes(key).c_str(), addslashes(value).c_str());
+                else if (lst->format == 1)
+                    printf("set %s %s\n", auto_addslashes(key).c_str(), value.c_str());
+                else
+                    printf("%s = %s\n", key.c_str(), value.c_str());
+                lst->n++;
+                lst->db->list_next(lst->handle, NULL);
+            }
+        });
+    }
+    else if (opname == "loadjson")
+    {
+        loading_json = true;
+        load_state = 0;
+        load_cb = cb;
+        loadjson();
+    }
+    else if (opname == "close")
+    {
+        db->close([=]()
+        {
+            fprintf(interactive ? stdout : stderr, "Index closed\n");
+            opened = false;
+            cb(0);
+        });
+    }
+    else if (opname == "quit" || opname == "q")
+    {
+        ::close(0);
+        finished = true;
+    }
+    else
+    {
+        fprintf(
+            stderr, "Unknown operation: %s. Supported operations:\n"
+            "open <image>\nopen <pool_id> <inode_id>\n"
+            "config <property> <value>\n"
+            "get <key>\nset <key> <value>\ndel <key>\n"
+            "list [<start> [end]]\ndump [<start> [end]]\ndumpjson [<start> [end]]\nloadjson\n"
+            "close\nquit\n", opname.c_str()
+        );
+        cb(-EINVAL);
+    }
+}
+
+int main(int narg, const char *args[])
+{
+    setvbuf(stdout, NULL, _IONBF, 0);
+    setvbuf(stderr, NULL, _IONBF, 0);
+    exe_name = args[0];
+    kv_cli_t *p = new kv_cli_t();
+    p->parse_args(narg, args);
+    p->run();
+    delete p;
+    return 0;
+}

src/kv_db.h

@@ -0,0 +1,36 @@
+// Copyright (c) Vitaliy Filippov, 2019+
+// License: VNPL-1.1 (see README.md for details)
+//
+// Vitastor shared key/value database
+// Parallel optimistic B-Tree O:-)
+
+#pragma once
+
+#include "cluster_client.h"
+
+struct kv_db_t;
+
+struct kv_dbw_t
+{
+    kv_dbw_t(cluster_client_t *cli);
+    ~kv_dbw_t();
+
+    void open(inode_t inode_id, json11::Json cfg, std::function<void(int)> cb);
+    void set_config(json11::Json cfg);
+    void close(std::function<void()> cb);
+
+    uint64_t get_size();
+
+    void get(const std::string & key, std::function<void(int res, const std::string & value)> cb,
+        bool allow_old_cached = false);
+    void set(const std::string & key, const std::string & value, std::function<void(int res)> cb,
+        std::function<bool(int res, const std::string & value)> cas_compare = NULL);
+    void del(const std::string & key, std::function<void(int res)> cb,
+        std::function<bool(int res, const std::string & value)> cas_compare = NULL);
+
+    void* list_start(const std::string & start);
+    void list_next(void *handle, std::function<void(int res, const std::string & key, const std::string & value)> cb);
+    void list_close(void *handle);
+
+    kv_db_t *db;
+};