Save cached_read_* in superblock

Instead of it, just do not verify checksums of currently mutated objects.
When clean data modification during flush runs in parallel to a read request,
that request may read a mix of old and new data. It may even read a mix of
multiple flushed versions if it lasts too long... And attempts to verify it
using temporary copies of metadata make the algorithm too complex and creepy.

CMakeLists.txt

@@ -2,6 +2,6 @@ cmake_minimum_required(VERSION 2.8.12)
 
 project(vitastor)
 
-set(VERSION "1.0.0")
+set(VERSION "0.9.3")
 
 add_subdirectory(src)

csi/Makefile

@@ -1,4 +1,4 @@
-VERSION ?= v1.0.0
+VERSION ?= v0.9.3
 
 all: build push
 

csi/deploy/004-csi-nodeplugin.yaml

@@ -49,7 +49,7 @@ spec:
             capabilities:
               add: ["SYS_ADMIN"]
             allowPrivilegeEscalation: true
-          image: vitalif/vitastor-csi:v1.0.0
+          image: vitalif/vitastor-csi:v0.9.3
           args:
             - "--node=$(NODE_ID)"
             - "--endpoint=$(CSI_ENDPOINT)"

csi/deploy/007-csi-provisioner.yaml

@@ -116,7 +116,7 @@ spec:
             privileged: true
             capabilities:
               add: ["SYS_ADMIN"]
-          image: vitalif/vitastor-csi:v1.0.0
+          image: vitalif/vitastor-csi:v0.9.3
           args:
             - "--node=$(NODE_ID)"
             - "--endpoint=$(CSI_ENDPOINT)"

csi/src/config.go

@@ -5,7 +5,7 @@ package vitastor
 
 const (
     vitastorCSIDriverName    = "csi.vitastor.io"
-    vitastorCSIDriverVersion = "1.0.0"
+    vitastorCSIDriverVersion = "0.9.3"
 )
 
 // Config struct fills the parameters of request or user input

debian/changelog

@@ -1,10 +1,10 @@
-vitastor (1.0.0-1) unstable; urgency=medium
+vitastor (0.9.3-1) unstable; urgency=medium
 
   * Bugfixes
 
  -- Vitaliy Filippov <vitalif@yourcmc.ru>  Fri, 03 Jun 2022 02:09:44 +0300
 
-vitastor (1.0.0-1) unstable; urgency=medium
+vitastor (0.9.3-1) unstable; urgency=medium
 
   * Implement NFS proxy
   * Add documentation

debian/patched-qemu.Dockerfile

@@ -28,19 +28,13 @@ RUN apt-get --download-only source qemu
 
 ADD patches /root/vitastor/patches
 ADD src/qemu_driver.c /root/vitastor/src/qemu_driver.c
-
-#RUN set -e; \
-#    apt-get install -y wget; \
-#    wget -q -O /etc/apt/trusted.gpg.d/vitastor.gpg https://vitastor.io/debian/pubkey.gpg; \
-#    (echo deb http://vitastor.io/debian $REL main > /etc/apt/sources.list.d/vitastor.list); \
-#    (echo "APT::Install-Recommends false;" > /etc/apt/apt.conf) && \
-#    apt-get update; \
-#    apt-get install -y vitastor-client vitastor-client-dev quilt
-
 RUN set -e; \
-    dpkg -i /root/packages/vitastor-$REL/vitastor-client_*.deb /root/packages/vitastor-$REL/vitastor-client-dev_*.deb; \
+    apt-get install -y wget; \
+    wget -q -O /etc/apt/trusted.gpg.d/vitastor.gpg https://vitastor.io/debian/pubkey.gpg; \
+    (echo deb http://vitastor.io/debian $REL main > /etc/apt/sources.list.d/vitastor.list); \
+    (echo "APT::Install-Recommends false;" > /etc/apt/apt.conf) && \
     apt-get update; \
-    apt-get install -y quilt; \
+    apt-get install -y vitastor-client vitastor-client-dev quilt; \
     mkdir -p /root/packages/qemu-$REL; \
     rm -rf /root/packages/qemu-$REL/*; \
     cd /root/packages/qemu-$REL; \

debian/vitastor.Dockerfile

@@ -35,8 +35,8 @@ RUN set -e -x; \
     mkdir -p /root/packages/vitastor-$REL; \
     rm -rf /root/packages/vitastor-$REL/*; \
     cd /root/packages/vitastor-$REL; \
-    cp -r /root/vitastor vitastor-1.0.0; \
-    cd vitastor-1.0.0; \
+    cp -r /root/vitastor vitastor-0.9.3; \
+    cd vitastor-0.9.3; \
     ln -s /root/fio-build/fio-*/ ./fio; \
     FIO=$(head -n1 fio/debian/changelog | perl -pe 's/^.*\((.*?)\).*$/$1/'); \
     ls /usr/include/linux/raw.h || cp ./debian/raw.h /usr/include/linux/raw.h; \
@@ -49,8 +49,8 @@ RUN set -e -x; \
     rm -rf a b; \
     echo "dep:fio=$FIO" > debian/fio_version; \
     cd /root/packages/vitastor-$REL; \
-    tar --sort=name --mtime='2020-01-01' --owner=0 --group=0 --exclude=debian -cJf vitastor_1.0.0.orig.tar.xz vitastor-1.0.0; \
-    cd vitastor-1.0.0; \
+    tar --sort=name --mtime='2020-01-01' --owner=0 --group=0 --exclude=debian -cJf vitastor_0.9.3.orig.tar.xz vitastor-0.9.3; \
+    cd vitastor-0.9.3; \
     V=$(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/layout-osd.en.md

@@ -197,22 +197,21 @@ Must be equal or a multiple of [bitmap_granularity](layout-cluster.en.md#bitmap_
 
 Checksums increase metadata size by 4 bytes per each csum_block_size of data.
 
-Checksums are always a tradeoff:
+Checksums are always a compromise:
 1. You either sacrifice +1 GB RAM per 1 TB of data
 2. Or you raise csum_block_size, for example, to 32k and sacrifice
    50% random write iops due to checksum read-modify-write
 3. Or you turn off [inmemory_metadata](osd.en.md#inmemory_metadata) and
    sacrifice 50% random read iops due to checksum reads
 
-All-flash clusters usually have enough RAM to use default csum_block_size,
-which uses 1 GB RAM per 1 TB of data. HDD clusters usually don't.
+Option 1 (default) is recommended for all-flash setups because these usually
+have enough RAM.
 
-Thus, recommended setups are:
-1. All-flash, 1 GB RAM per 1 TB data: default (csum_block_size=4k)
-2. All-flash, less RAM: csum_block_size=4k + inmemory_metadata=false
-3. Hybrid HDD+SSD: csum_block_size=4k + inmemory_metadata=false
-4. HDD-only, faster random read: csum_block_size=32k
-5. HDD-only, faster random write: csum_block_size=4k +
-   inmemory_metadata=false + cached_io_meta=true
+Option 2 is recommended for HDD-only setups. HDD-only setups usually do NOT
+have enough RAM for the default 4 KB csum_block_size.
 
-See also [cached_io_meta](osd.en.md#cached_io_meta).
+Option 3 is recommended for SSD+HDD setups (because metadata SSDs will handle
+extra reads without any performance drop) and also *maybe* for NVMe all-flash
+setups when you don't have enough RAM (because NVMe drives have plenty
+of read iops to spare). You may also consider enabling
+[cached_read_meta](osd.en.md#cached_read_meta) in this case.

docs/config/layout-osd.ru.md

@@ -220,12 +220,17 @@ csum_block_size данных.
    жертвуете 50% скорости случайного чтения из-за чтения контрольных сумм
    с диска
 
-Таким образом, рекомендуются следующие варианты настроек:
-1. All-flash, 1 ГБ памяти на 1 ТБ данных: по умолчанию (csum_block_size=4k)
-2. All-flash, меньше памяти: csum_block_size=4k + inmemory_metadata=false
-3. Гибридные HDD+SSD: csum_block_size=4k + inmemory_metadata=false
-4. Только HDD, быстрее случайное чтение: csum_block_size=32k
-5. Только HDD, быстрее случайная запись: csum_block_size=4k +
-   inmemory_metadata=false + cached_io_meta=true
+Вариант 1 (при настройках по умолчанию) рекомендуется для SSD (All-Flash)
+кластеров, потому что памяти в них обычно хватает.
 
-Смотрите также [cached_io_meta](osd.ru.md#cached_io_meta).
+Вариант 2 рекомендуется для кластеров на одних жёстких дисках (без SSD
+под метаданные). На 4 кб блок контрольной суммы памяти в таких кластерах
+обычно НЕ хватает.
+
+Вариант 3 рекомендуется для гибридных кластеров (SSD+HDD), потому что
+скорости SSD под метаданными хватит, чтобы обработать дополнительные чтения
+без снижения производительности. Также вариант 3 *может* рекомендоваться
+для All-Flash кластеров на основе NVMe-дисков, когда памяти НЕ достаточно,
+потому что NVMe-диски имеют огромный запас производительности по чтению.
+В таких случаях, возможно, также имеет смысл включать параметр
+[cached_read_meta](osd.ru.md#cached_read_meta).

docs/config/osd.en.md

@@ -31,9 +31,9 @@ them, even without restarting by updating configuration in etcd.
 - [max_flusher_count](#max_flusher_count)
 - [inmemory_metadata](#inmemory_metadata)
 - [inmemory_journal](#inmemory_journal)
-- [cached_io_data](#cached_io_data)
-- [cached_io_meta](#cached_io_meta)
-- [cached_io_journal](#cached_io_journal)
+- [cached_read_data](#cached_read_data)
+- [cached_read_meta](#cached_read_meta)
+- [cached_read_journal](#cached_read_journal)
 - [journal_sector_buffer_count](#journal_sector_buffer_count)
 - [journal_no_same_sector_overwrites](#journal_no_same_sector_overwrites)
 - [throttle_small_writes](#throttle_small_writes)
@@ -258,46 +258,44 @@ is typically very small because it's sufficient to have 16-32 MB journal
 for SSD OSDs. However, in theory it's possible that you'll want to turn it
 off for hybrid (HDD+SSD) OSDs with large journals on quick devices.
 
-## cached_io_data
+## cached_read_data
 
 - Type: boolean
 - Default: false
 
-Read and write *data* through Linux page cache, i.e. use a file descriptor
-opened with O_SYNC, but without O_DIRECT for I/O. May improve read
-performance for hot data and slower disks - HDDs and maybe SATA SSDs.
-Not recommended for desktop SSDs without capacitors because O_SYNC flushes
-disk cache on every write.
+Read data through Linux page cache, i.e. use a file descriptor opened without
+O_DIRECT for data reads. May improve read performance for frequently accessed
+data if it fits in RAM. Memory in page cache is shared by all processes and
+not accounted in OSD memory consumption.
 
-## cached_io_meta
+## cached_read_meta
 
 - Type: boolean
 - Default: false
 
-Read and write *metadata* through Linux page cache. May improve read
-performance only if your drives are relatively slow (HDD, SATA SSD), and
-only if checksums are enabled and [inmemory_metadata](#inmemory_metadata)
-is disabled, because in this case metadata blocks are read from disk
-on every read request to verify checksums and caching them may reduce this
-extra read load.
+Read metadata through Linux page cache. May be beneficial when checksums
+are enabled and [inmemory_metadata](#inmemory_metadata) is disabled, because
+in this case metadata blocks are read from disk to verify checksums on every
+read request and caching them may reduce this extra read load.
 
 Absolutely pointless to enable with enabled inmemory_metadata because all
 metadata is kept in memory anyway, and likely pointless without checksums,
 because in that case, metadata blocks are read from disk only during journal
 flushing.
 
-If the same device is used for data and metadata, enabling [cached_io_data](#cached_io_data)
+If the same device is used for data and metadata, enabling [cached_read_data](#cached_read_data)
 also enables this parameter, given that it isn't turned off explicitly.
 
-## cached_io_journal
+## cached_read_journal
 
 - Type: boolean
 - Default: false
 
-Read and write *journal* through Linux page cache. May improve read
-performance if [inmemory_journal](#inmemory_journal) is turned off.
+Read buffered data from journal through Linux page cache. Does not have sense
+without disabling [inmemory_journal](#inmemory_journal), which, again, is
+enabled by default.
 
-If the same device is used for metadata and journal, enabling [cached_io_meta](#cached_io_meta)
+If the same device is used for metadata and journal, enabling [cached_read_meta](#cached_read_meta)
 also enables this parameter, given that it isn't turned off explicitly.
 
 ## journal_sector_buffer_count

docs/config/osd.ru.md

@@ -32,9 +32,9 @@
 - [max_flusher_count](#max_flusher_count)
 - [inmemory_metadata](#inmemory_metadata)
 - [inmemory_journal](#inmemory_journal)
-- [cached_io_data](#cached_io_data)
-- [cached_io_meta](#cached_io_meta)
-- [cached_io_journal](#cached_io_journal)
+- [cached_read_data](#cached_read_data)
+- [cached_read_meta](#cached_read_meta)
+- [cached_read_journal](#cached_read_journal)
 - [journal_sector_buffer_count](#journal_sector_buffer_count)
 - [journal_no_same_sector_overwrites](#journal_no_same_sector_overwrites)
 - [throttle_small_writes](#throttle_small_writes)
@@ -266,28 +266,27 @@ Flusher - это микро-поток (корутина), которая коп
 параметра может оказаться полезным для гибридных OSD (HDD+SSD) с большими
 журналами, расположенными на быстром по сравнению с HDD устройстве.
 
-## cached_io_data
+## cached_read_data
 
 - Тип: булево (да/нет)
 - Значение по умолчанию: false
 
-Читать и записывать *данные* через системный кэш Linux (page cache), то есть,
-использовать для данных файловый дескриптор, открытый без флага O_DIRECT, но
-с флагом O_SYNC. Может улучшить скорость чтения для относительно медленных
-дисков - HDD и, возможно, SATA SSD. Не рекомендуется для потребительских
-SSD без конденсаторов, так как O_SYNC сбрасывает кэш диска при каждой записи.
+Читать данные через системный кэш Linux (page cache), то есть, использовать
+для чтения данных файловый дескриптор, открытый без флага O_DIRECT. Может
+улучшить производительность чтения для часто используемых данных, если они
+помещаются в память. Память кэша разделяется между всеми процессами в
+системе и не учитывается в потреблении памяти процессом OSD.
 
-## cached_io_meta
+## cached_read_meta
 
 - Тип: булево (да/нет)
 - Значение по умолчанию: false
 
-Читать и записывать *метаданные* через системный кэш Linux. Может улучшить
-скорость чтения, если у вас медленные диски, и только если контрольные суммы
-включены, а параметр [inmemory_metadata](#inmemory_metadata) отключён, так
-как в этом случае блоки метаданных читаются с диска при каждом запросе чтения
-для проверки контрольных сумм и их кэширование может снизить дополнительную
-нагрузку на диск.
+Читать метаданные через системный кэш Linux. Может быть полезно, когда
+включены контрольные суммы, а параметр [inmemory_metadata](#inmemory_metadata)
+отключён, так как в этом случае блоки метаданных читаются с диска при каждом
+запросе чтения для проверки контрольных сумм и их кэширование может снизить
+дополнительную нагрузку на диск.
 
 Абсолютно бессмысленно включать данный параметр, если параметр
 inmemory_metadata включён (по умолчанию это так), и также вероятно
@@ -296,20 +295,20 @@ inmemory_metadata включён (по умолчанию это так), и т
 журнала.
 
 Если одно и то же устройство используется для данных и метаданных, включение
-[cached_io_data](#cached_io_data) также включает данный параметр, при
+[cached_read_data](#cached_read_data) также включает данный параметр, при
 условии, что он не отключён явным образом.
 
-## cached_io_journal
+## cached_read_journal
 
 - Тип: булево (да/нет)
 - Значение по умолчанию: false
 
-Читать и записывать *журнал* через системный кэш Linux. Может улучшить
-скорость чтения, если параметр [inmemory_journal](#inmemory_journal)
-отключён.
+Читать буферизованные в журнале данные через системный кэш Linux. Не имеет
+смысла без отключения параметра [inmemory_journal](#inmemory_journal),
+который, опять же, по умолчанию включён.
 
 Если одно и то же устройство используется для метаданных и журнала,
-включение [cached_io_meta](#cached_io_meta) также включает данный
+включение [cached_read_meta](#cached_read_meta) также включает данный
 параметр, при условии, что он не отключён явным образом.
 
 ## journal_sector_buffer_count

docs/config/src/layout-osd.yml

@@ -228,25 +228,24 @@
 
     Checksums increase metadata size by 4 bytes per each csum_block_size of data.
 
-    Checksums are always a tradeoff:
+    Checksums are always a compromise:
     1. You either sacrifice +1 GB RAM per 1 TB of data
     2. Or you raise csum_block_size, for example, to 32k and sacrifice
        50% random write iops due to checksum read-modify-write
     3. Or you turn off [inmemory_metadata](osd.en.md#inmemory_metadata) and
        sacrifice 50% random read iops due to checksum reads
 
-    All-flash clusters usually have enough RAM to use default csum_block_size,
-    which uses 1 GB RAM per 1 TB of data. HDD clusters usually don't.
+    Option 1 (default) is recommended for all-flash setups because these usually
+    have enough RAM.
 
-    Thus, recommended setups are:
-    1. All-flash, 1 GB RAM per 1 TB data: default (csum_block_size=4k)
-    2. All-flash, less RAM: csum_block_size=4k + inmemory_metadata=false
-    3. Hybrid HDD+SSD: csum_block_size=4k + inmemory_metadata=false
-    4. HDD-only, faster random read: csum_block_size=32k
-    5. HDD-only, faster random write: csum_block_size=4k +
-       inmemory_metadata=false + cached_io_meta=true
+    Option 2 is recommended for HDD-only setups. HDD-only setups usually do NOT
+    have enough RAM for the default 4 KB csum_block_size.
 
-    See also [cached_io_meta](osd.en.md#cached_io_meta).
+    Option 3 is recommended for SSD+HDD setups (because metadata SSDs will handle
+    extra reads without any performance drop) and also *maybe* for NVMe all-flash
+    setups when you don't have enough RAM (because NVMe drives have plenty
+    of read iops to spare). You may also consider enabling
+    [cached_read_meta](osd.en.md#cached_read_meta) in this case.
   info_ru: |
     Размер блока расчёта контрольных сумм.
 
@@ -265,12 +264,17 @@
        жертвуете 50% скорости случайного чтения из-за чтения контрольных сумм
        с диска
 
-    Таким образом, рекомендуются следующие варианты настроек:
-    1. All-flash, 1 ГБ памяти на 1 ТБ данных: по умолчанию (csum_block_size=4k)
-    2. All-flash, меньше памяти: csum_block_size=4k + inmemory_metadata=false
-    3. Гибридные HDD+SSD: csum_block_size=4k + inmemory_metadata=false
-    4. Только HDD, быстрее случайное чтение: csum_block_size=32k
-    5. Только HDD, быстрее случайная запись: csum_block_size=4k +
-       inmemory_metadata=false + cached_io_meta=true
+    Вариант 1 (при настройках по умолчанию) рекомендуется для SSD (All-Flash)
+    кластеров, потому что памяти в них обычно хватает.
 
-    Смотрите также [cached_io_meta](osd.ru.md#cached_io_meta).
+    Вариант 2 рекомендуется для кластеров на одних жёстких дисках (без SSD
+    под метаданные). На 4 кб блок контрольной суммы памяти в таких кластерах
+    обычно НЕ хватает.
+
+    Вариант 3 рекомендуется для гибридных кластеров (SSD+HDD), потому что
+    скорости SSD под метаданными хватит, чтобы обработать дополнительные чтения
+    без снижения производительности. Также вариант 3 *может* рекомендоваться
+    для All-Flash кластеров на основе NVMe-дисков, когда памяти НЕ достаточно,
+    потому что NVMe-диски имеют огромный запас производительности по чтению.
+    В таких случаях, возможно, также имеет смысл включать параметр
+    [cached_read_meta](osd.ru.md#cached_read_meta).

docs/config/src/osd.yml

@@ -260,46 +260,42 @@
     достаточно 16- или 32-мегабайтного журнала. Однако в теории отключение
     параметра может оказаться полезным для гибридных OSD (HDD+SSD) с большими
     журналами, расположенными на быстром по сравнению с HDD устройстве.
-- name: cached_io_data
+- name: cached_read_data
   type: bool
   default: false
   info: |
-    Read and write *data* through Linux page cache, i.e. use a file descriptor
-    opened with O_SYNC, but without O_DIRECT for I/O. May improve read
-    performance for hot data and slower disks - HDDs and maybe SATA SSDs.
-    Not recommended for desktop SSDs without capacitors because O_SYNC flushes
-    disk cache on every write.
+    Read data through Linux page cache, i.e. use a file descriptor opened without
+    O_DIRECT for data reads. May improve read performance for frequently accessed
+    data if it fits in RAM. Memory in page cache is shared by all processes and
+    not accounted in OSD memory consumption.
   info_ru: |
-    Читать и записывать *данные* через системный кэш Linux (page cache), то есть,
-    использовать для данных файловый дескриптор, открытый без флага O_DIRECT, но
-    с флагом O_SYNC. Может улучшить скорость чтения для относительно медленных
-    дисков - HDD и, возможно, SATA SSD. Не рекомендуется для потребительских
-    SSD без конденсаторов, так как O_SYNC сбрасывает кэш диска при каждой записи.
-- name: cached_io_meta
+    Читать данные через системный кэш Linux (page cache), то есть, использовать
+    для чтения данных файловый дескриптор, открытый без флага O_DIRECT. Может
+    улучшить производительность чтения для часто используемых данных, если они
+    помещаются в память. Память кэша разделяется между всеми процессами в
+    системе и не учитывается в потреблении памяти процессом OSD.
+- name: cached_read_meta
   type: bool
   default: false
   info: |
-    Read and write *metadata* through Linux page cache. May improve read
-    performance only if your drives are relatively slow (HDD, SATA SSD), and
-    only if checksums are enabled and [inmemory_metadata](#inmemory_metadata)
-    is disabled, because in this case metadata blocks are read from disk
-    on every read request to verify checksums and caching them may reduce this
-    extra read load.
+    Read metadata through Linux page cache. May be beneficial when checksums
+    are enabled and [inmemory_metadata](#inmemory_metadata) is disabled, because
+    in this case metadata blocks are read from disk to verify checksums on every
+    read request and caching them may reduce this extra read load.
 
     Absolutely pointless to enable with enabled inmemory_metadata because all
     metadata is kept in memory anyway, and likely pointless without checksums,
     because in that case, metadata blocks are read from disk only during journal
     flushing.
 
-    If the same device is used for data and metadata, enabling [cached_io_data](#cached_io_data)
+    If the same device is used for data and metadata, enabling [cached_read_data](#cached_read_data)
     also enables this parameter, given that it isn't turned off explicitly.
   info_ru: |
-    Читать и записывать *метаданные* через системный кэш Linux. Может улучшить
-    скорость чтения, если у вас медленные диски, и только если контрольные суммы
-    включены, а параметр [inmemory_metadata](#inmemory_metadata) отключён, так
-    как в этом случае блоки метаданных читаются с диска при каждом запросе чтения
-    для проверки контрольных сумм и их кэширование может снизить дополнительную
-    нагрузку на диск.
+    Читать метаданные через системный кэш Linux. Может быть полезно, когда
+    включены контрольные суммы, а параметр [inmemory_metadata](#inmemory_metadata)
+    отключён, так как в этом случае блоки метаданных читаются с диска при каждом
+    запросе чтения для проверки контрольных сумм и их кэширование может снизить
+    дополнительную нагрузку на диск.
 
     Абсолютно бессмысленно включать данный параметр, если параметр
     inmemory_metadata включён (по умолчанию это так), и также вероятно
@@ -308,24 +304,25 @@
     журнала.
 
     Если одно и то же устройство используется для данных и метаданных, включение
-    [cached_io_data](#cached_io_data) также включает данный параметр, при
+    [cached_read_data](#cached_read_data) также включает данный параметр, при
     условии, что он не отключён явным образом.
-- name: cached_io_journal
+- name: cached_read_journal
   type: bool
   default: false
   info: |
-    Read and write *journal* through Linux page cache. May improve read
-    performance if [inmemory_journal](#inmemory_journal) is turned off.
+    Read buffered data from journal through Linux page cache. Does not have sense
+    without disabling [inmemory_journal](#inmemory_journal), which, again, is
+    enabled by default.
 
-    If the same device is used for metadata and journal, enabling [cached_io_meta](#cached_io_meta)
+    If the same device is used for metadata and journal, enabling [cached_read_meta](#cached_read_meta)
     also enables this parameter, given that it isn't turned off explicitly.
   info_ru: |
-    Читать и записывать *журнал* через системный кэш Linux. Может улучшить
-    скорость чтения, если параметр [inmemory_journal](#inmemory_journal)
-    отключён.
+    Читать буферизованные в журнале данные через системный кэш Linux. Не имеет
+    смысла без отключения параметра [inmemory_journal](#inmemory_journal),
+    который, опять же, по умолчанию включён.
 
     Если одно и то же устройство используется для метаданных и журнала,
-    включение [cached_io_meta](#cached_io_meta) также включает данный
+    включение [cached_read_meta](#cached_read_meta) также включает данный
     параметр, при условии, что он не отключён явным образом.
 - name: journal_sector_buffer_count
   type: int

docs/installation/packages.en.md

@@ -14,8 +14,6 @@
   - Debian 12 (Bookworm/Sid): `deb https://vitastor.io/debian bookworm main`
   - Debian 11 (Bullseye): `deb https://vitastor.io/debian bullseye main`
   - Debian 10 (Buster): `deb https://vitastor.io/debian buster main`
-  - Add `-oldstable` to bookworm/bullseye/buster in this line to install the last
-    stable version from 0.9.x branch instead of 1.x
 - For Debian 10 (Buster) also enable backports repository:
   `deb http://deb.debian.org/debian buster-backports main`
 - Install packages: `apt update; apt install vitastor lp-solve etcd linux-image-amd64 qemu`

docs/installation/packages.ru.md

@@ -14,8 +14,6 @@
   - Debian 12 (Bookworm/Sid): `deb https://vitastor.io/debian bookworm main`
   - Debian 11 (Bullseye): `deb https://vitastor.io/debian bullseye main`
   - Debian 10 (Buster): `deb https://vitastor.io/debian buster main`
-  - Добавьте `-oldstable` к слову bookworm/bullseye/buster в этой строке, чтобы
-    установить последнюю стабильную версию из ветки 0.9.x вместо 1.x
 - Для Debian 10 (Buster) также включите репозиторий backports:
   `deb http://deb.debian.org/debian buster-backports main`
 - Установите пакеты: `apt update; apt install vitastor lp-solve etcd linux-image-amd64 qemu`

docs/installation/source.en.md

@@ -21,7 +21,7 @@
 
 ## Basic instructions
 
-Download source, for example using git: `git clone --recurse-submodules https://git.yourcmc.ru/vitalif/vitastor/`
+Download source, for example using git: `git clone --recurse-submodules https://yourcmc.ru/git/vitalif/vitastor/`
 
 Get `fio` source and symlink it into `<vitastor>/fio`. If you don't want to build fio engine,
 you can disable it by passing `-DWITH_FIO=no` to cmake.
@@ -41,7 +41,7 @@ It's recommended to build the QEMU driver (qemu_driver.c) in-tree, as a part of
 QEMU build process. To do that:
 - Install vitastor client library headers (from source or from vitastor-client-dev package)
 - Take a corresponding patch from `patches/qemu-*-vitastor.patch` and apply it to QEMU source
-- Copy `src/qemu_driver.c` to QEMU source directory as `block/vitastor.c`
+- Copy `src/qemu_driver.c` to QEMU source directory as `block/block-vitastor.c`
 - Build QEMU as usual
 
 But it is also possible to build it out-of-tree. To do that:

docs/installation/source.ru.md

@@ -21,7 +21,7 @@
 
 ## Базовая инструкция
 
-Скачайте исходные коды, например, из git: `git clone --recurse-submodules https://git.yourcmc.ru/vitalif/vitastor/`
+Скачайте исходные коды, например, из git: `git clone --recurse-submodules https://yourcmc.ru/git/vitalif/vitastor/`
 
 Скачайте исходные коды пакета `fio`, распакуйте их и создайте символическую ссылку на них
 в директории исходников Vitastor: `<vitastor>/fio`. Либо, если вы не хотите собирать плагин fio,
@@ -41,7 +41,7 @@ cmake .. && make -j8 install
 Драйвер QEMU (qemu_driver.c) рекомендуется собирать вместе с самим QEMU. Для этого:
 - Установите заголовки клиентской библиотеки Vitastor (из исходников или из пакета vitastor-client-dev)
 - Возьмите соответствующий патч из `patches/qemu-*-vitastor.patch` и примените его к исходникам QEMU
-- Скопируйте [src/qemu_driver.c](../../src/qemu_driver.c) в директорию исходников QEMU как `block/vitastor.c`
+- Скопируйте [src/qemu_driver.c](../../src/qemu_driver.c) в директорию исходников QEMU как `block/block-vitastor.c`
 - Соберите QEMU как обычно
 
 Однако в целях отладки драйвер также можно собирать отдельно от QEMU. Для этого:
@@ -60,7 +60,7 @@ cmake .. && make -j8 install
       * Для QEMU 2.0+: `<qemu>/qapi-types.h` &rarr; `<vitastor>/qemu/b/qemu/qapi-types.h`
    - `config-host.h` и `qapi` нужны, т.к. в них содержатся автогенерируемые заголовки
 - Сконфигурируйте cmake Vitastor с `WITH_QEMU=yes` (`cmake .. -DWITH_QEMU=yes`) и, если вы
-  используете RHEL-подобный дистрибутив, также с `QEMU_PLUGINDIR=qemu-kvm`.
+  используете RHEL-подобый дистрибутив, также с `QEMU_PLUGINDIR=qemu-kvm`.
 - После этого в процессе сборки Vitastor также будет собираться подходящий для вашей
   версии QEMU `block-vitastor.so`.
 - Таким образом можно использовать драйвер даже с немодифицированным QEMU, но в этом случае

docs/intro/features.en.md

@@ -29,7 +29,7 @@
 - Snapshots and copy-on-write image clones
 - [Write throttling to smooth random write workloads in SSD+HDD configurations](../config/osd.en.md#throttle_small_writes)
 - [RDMA/RoCEv2 support via libibverbs](../config/network.en.md#rdma_device)
-- [Scrubbing](../config/osd.en.md#auto_scrub) (verification of copies)
+- [Scrubbing without checksums](../config/osd.en.md#auto_scrub) (verification of copies)
 - [Checksums](../config/layout-osd.en.md#data_csum_type)
 
 ## Plugins and tools

docs/intro/features.ru.md

@@ -31,7 +31,7 @@
 - Снапшоты и copy-on-write клоны
 - [Сглаживание производительности случайной записи в SSD+HDD конфигурациях](../config/osd.ru.md#throttle_small_writes)
 - [Поддержка RDMA/RoCEv2 через libibverbs](../config/network.ru.md#rdma_device)
-- [Фоновая проверка целостности](../config/osd.ru.md#auto_scrub) (сверка копий)
+- [Фоновая проверка целостности без контрольных сумм](../config/osd.ru.md#auto_scrub) (сверка копий)
 - [Контрольные суммы](../config/layout-osd.ru.md#data_csum_type)
 
 ## Драйверы и инструменты

docs/usage/disk.en.md

@@ -102,7 +102,7 @@ checks the device cache status on start and tries to disable cache for SATA/SAS
 If it doesn't succeed it issues a warning in the system log.
 
 You can also pass other OSD options here as arguments and they'll be persisted
-in the superblock: cached_io_data, cached_io_meta, cached_io_journal,
+in the superblock: cached_read_data, cached_read_meta, cached_read_journal,
 inmemory_metadata, inmemory_journal, max_write_iodepth,
 min_flusher_count, max_flusher_count, journal_sector_buffer_count,
 journal_no_same_sector_overwrites, throttle_small_writes, throttle_target_iops,

docs/usage/disk.ru.md

@@ -103,8 +103,8 @@ vitastor-disk - инструмент командной строки для уп
 это не удаётся, в системный журнал выводится предупреждение.
 
 Вы можете передать данной команде и некоторые другие опции OSD в качестве аргументов
-и они тоже будут сохранены в суперблок: cached_io_data, cached_io_meta,
-cached_io_journal, inmemory_metadata, inmemory_journal, max_write_iodepth,
+и они тоже будут сохранены в суперблок: cached_read_data, cached_read_meta,
+cached_read_journal, inmemory_metadata, inmemory_journal, max_write_iodepth,
 min_flusher_count, max_flusher_count, journal_sector_buffer_count,
 journal_no_same_sector_overwrites, throttle_small_writes, throttle_target_iops,
 throttle_target_mbs, throttle_target_parallelism, throttle_threshold_us.

docs/usage/qemu.en.md

@@ -107,8 +107,7 @@ disabled by now, so if you want to try it on Debian, use a kernel from Ubuntu
 Commands to attach Vitastor image as a VDUSE device:
 
 ```
-modprobe vduse
-modprobe virtio-vdpa
+modprobe vduse virtio-vdpa
 qemu-storage-daemon --daemonize --blockdev '{"node-name":"test1","driver":"vitastor",\
   "etcd-host":"192.168.7.2:2379/v3","image":"testosd1","cache":{"direct":true,"no-flush":false},"discard":"unmap"}' \
   --export vduse-blk,id=test1,node-name=test1,name=test1,num-queues=16,queue-size=128,writable=true

docs/usage/qemu.ru.md

@@ -111,8 +111,7 @@ VDUSE (CONFIG_VIRTIO_VDPA=m и CONFIG_VDPA_USER=m). В ядрах в Debian Linu
 Команды для подключения виртуального диска через VDUSE:
 
 ```
-modprobe vduse
-modprobe virtio-vdpa
+modprobe vduse virtio-vdpa
 qemu-storage-daemon --daemonize --blockdev '{"node-name":"test1","driver":"vitastor",\
   "etcd-host":"192.168.7.2:2379/v3","image":"testosd1","cache":{"direct":true,"no-flush":false},"discard":"unmap"}' \
   --export vduse-blk,id=test1,node-name=test1,name=test1,num-queues=16,queue-size=128,writable=true

mon/mon.js

@@ -1497,14 +1497,10 @@ class Mon
                     break;
                 }
             }
-            const pool_cfg = (this.state.config.pools[pool_id]||{});
             if (!object_size)
             {
-                object_size = pool_cfg.block_size || this.config.block_size || 131072;
-            }
-            if (pool_cfg.scheme !== 'replicated')
-            {
-                object_size *= ((pool_cfg.pg_size||0) - (pool_cfg.parity_chunks||0));
+                object_size = (this.state.config.pools[pool_id]||{}).block_size ||
+                    this.config.block_size || 131072;
             }
             object_size = BigInt(object_size);
             for (const pg_num in this.state.pg.stats[pool_id])

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 = '1.0.0'
+VERSION = '0.9.3'
 
 LOG = logging.getLogger(__name__)
 

patches/qemu-2.12-vitastor.patch

@@ -1,176 +0,0 @@
-diff --git a/block/Makefile.objs b/block/Makefile.objs
-index d644bac60a..e404236291 100644
---- a/block/Makefile.objs
-+++ b/block/Makefile.objs
-@@ -19,6 +19,7 @@ block-obj-$(if $(CONFIG_LIBISCSI),y,n) += iscsi-opts.o
- block-obj-$(CONFIG_LIBNFS) += nfs.o
- block-obj-$(CONFIG_CURL) += curl.o
- block-obj-$(CONFIG_RBD) += rbd.o
-+block-obj-$(CONFIG_VITASTOR) += vitastor.o
- block-obj-$(CONFIG_GLUSTERFS) += gluster.o
- block-obj-$(CONFIG_VXHS) += vxhs.o
- block-obj-$(CONFIG_LIBSSH2) += ssh.o
-@@ -39,6 +40,8 @@ curl.o-cflags      := $(CURL_CFLAGS)
- curl.o-libs        := $(CURL_LIBS)
- rbd.o-cflags       := $(RBD_CFLAGS)
- rbd.o-libs         := $(RBD_LIBS)
-+vitastor.o-cflags  := $(VITASTOR_CFLAGS)
-+vitastor.o-libs    := $(VITASTOR_LIBS)
- gluster.o-cflags   := $(GLUSTERFS_CFLAGS)
- gluster.o-libs     := $(GLUSTERFS_LIBS)
- vxhs.o-libs        := $(VXHS_LIBS)
-diff --git a/configure b/configure
-index 0a19b033bc..58b7fbf24c 100755
---- a/configure
-+++ b/configure
-@@ -398,6 +398,7 @@ trace_backends="log"
- trace_file="trace"
- spice=""
- rbd=""
-+vitastor=""
- smartcard=""
- libusb=""
- usb_redir=""
-@@ -1213,6 +1214,10 @@ for opt do
-   ;;
-   --enable-rbd) rbd="yes"
-   ;;
-+  --disable-vitastor) vitastor="no"
-+  ;;
-+  --enable-vitastor) vitastor="yes"
-+  ;;
-   --disable-xfsctl) xfs="no"
-   ;;
-   --enable-xfsctl) xfs="yes"
-@@ -1601,6 +1606,7 @@ disabled with --disable-FEATURE, default is enabled if available:
-   vhost-crypto    vhost-crypto acceleration support
-   spice           spice
-   rbd             rados block device (rbd)
-+  vitastor        vitastor block device
-   libiscsi        iscsi support
-   libnfs          nfs support
-   smartcard       smartcard support (libcacard)
-@@ -3594,6 +3600,27 @@ EOF
-   fi
- fi
- 
-+##########################################
-+# vitastor probe
-+if test "$vitastor" != "no" ; then
-+  cat > $TMPC <<EOF
-+#include <vitastor_c.h>
-+int main(void) {
-+  vitastor_c_create_qemu(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
-+  return 0;
-+}
-+EOF
-+  vitastor_libs="-lvitastor_client"
-+  if compile_prog "" "$vitastor_libs" ; then
-+    vitastor=yes
-+  else
-+    if test "$vitastor" = "yes" ; then
-+      feature_not_found "vitastor block device" "Install vitastor-client-dev"
-+    fi
-+    vitastor=no
-+  fi
-+fi
-+
- ##########################################
- # libssh2 probe
- min_libssh2_version=1.2.8
-@@ -5837,6 +5864,7 @@ echo "Trace output file $trace_file-<pid>"
- fi
- echo "spice support     $spice $(echo_version $spice $spice_protocol_version/$spice_server_version)"
- echo "rbd support       $rbd"
-+echo "vitastor support  $vitastor"
- echo "xfsctl support    $xfs"
- echo "smartcard support $smartcard"
- echo "libusb            $libusb"
-@@ -6416,6 +6444,11 @@ if test "$rbd" = "yes" ; then
-   echo "RBD_CFLAGS=$rbd_cflags" >> $config_host_mak
-   echo "RBD_LIBS=$rbd_libs" >> $config_host_mak
- fi
-+if test "$vitastor" = "yes" ; then
-+  echo "CONFIG_VITASTOR=m" >> $config_host_mak
-+  echo "VITASTOR_CFLAGS=$vitastor_cflags" >> $config_host_mak
-+  echo "VITASTOR_LIBS=$vitastor_libs" >> $config_host_mak
-+fi
- 
- echo "CONFIG_COROUTINE_BACKEND=$coroutine" >> $config_host_mak
- if test "$coroutine_pool" = "yes" ; then
-diff --git a/qapi/block-core.json b/qapi/block-core.json
-index c50517bff3..c780bb2c1c 100644
---- a/qapi/block-core.json
-+++ b/qapi/block-core.json
-@@ -2514,7 +2514,7 @@
-             'dmg', 'file', 'ftp', 'ftps', 'gluster', 'host_cdrom',
-             'host_device', 'http', 'https', 'iscsi', 'luks', 'nbd', 'nfs',
-             'null-aio', 'null-co', 'nvme', 'parallels', 'qcow', 'qcow2', 'qed',
--            'quorum', 'raw', 'rbd', 'replication', 'sheepdog', 'ssh',
-+            'quorum', 'raw', 'rbd', 'vitastor', 'replication', 'sheepdog', 'ssh',
-             'throttle', 'vdi', 'vhdx', 'vmdk', 'vpc', 'vvfat', 'vxhs' ] }
- 
- ##
-@@ -3217,6 +3217,28 @@
-             '*snap-id': 'uint32',
-             '*tag': 'str' } }
- 
-+##
-+# @BlockdevOptionsVitastor:
-+#
-+# Driver specific block device options for vitastor
-+#
-+# @image:       Image name
-+# @inode:       Inode number
-+# @pool:        Pool ID
-+# @size:        Desired image size in bytes
-+# @config-path: Path to Vitastor configuration
-+# @etcd-host:   etcd connection address(es)
-+# @etcd-prefix: etcd key/value prefix
-+##
-+{ 'struct': 'BlockdevOptionsVitastor',
-+  'data': { '*inode': 'uint64',
-+            '*pool': 'uint64',
-+            '*size': 'uint64',
-+            '*image': 'str',
-+            '*config-path': 'str',
-+            '*etcd-host': 'str',
-+            '*etcd-prefix': 'str' } }
-+
- ##
- # @ReplicationMode:
- #
-@@ -3547,6 +3569,7 @@
-       'rbd':        'BlockdevOptionsRbd',
-       'replication':'BlockdevOptionsReplication',
-       'sheepdog':   'BlockdevOptionsSheepdog',
-+      'vitastor':   'BlockdevOptionsVitastor',
-       'ssh':        'BlockdevOptionsSsh',
-       'throttle':   'BlockdevOptionsThrottle',
-       'vdi':        'BlockdevOptionsGenericFormat',
-@@ -3991,6 +4014,17 @@
-             '*subformat':           'BlockdevVhdxSubformat',
-             '*block-state-zero':    'bool' } }
- 
-+##
-+# @BlockdevCreateOptionsVitastor:
-+#
-+# Driver specific image creation options for Vitastor.
-+#
-+# @size: Size of the virtual disk in bytes
-+##
-+{ 'struct': 'BlockdevCreateOptionsVitastor',
-+  'data': { 'location':         'BlockdevOptionsVitastor',
-+            'size':             'size' } }
-+
- ##
- # @BlockdevVpcSubformat:
- #
-@@ -4074,6 +4108,7 @@
-       'rbd':            'BlockdevCreateOptionsRbd',
-       'replication':    'BlockdevCreateNotSupported',
-       'sheepdog':       'BlockdevCreateOptionsSheepdog',
-+      'vitastor':       'BlockdevCreateOptionsVitastor',
-       'ssh':            'BlockdevCreateOptionsSsh',
-       'throttle':       'BlockdevCreateNotSupported',
-       'vdi':            'BlockdevCreateOptionsVdi',

patches/qemu-5.2-vitastor.patch

@@ -1,181 +0,0 @@
-Index: qemu-5.2+dfsg/qapi/block-core.json
-===================================================================
---- qemu-5.2+dfsg.orig/qapi/block-core.json
-+++ qemu-5.2+dfsg/qapi/block-core.json
-@@ -2831,7 +2831,7 @@
-             'luks', 'nbd', 'nfs', 'null-aio', 'null-co', 'nvme', 'parallels',
-             'qcow', 'qcow2', 'qed', 'quorum', 'raw', 'rbd',
-             { 'name': 'replication', 'if': 'defined(CONFIG_REPLICATION)' },
--            'sheepdog',
-+            'sheepdog', 'vitastor',
-             'ssh', 'throttle', 'vdi', 'vhdx', 'vmdk', 'vpc', 'vvfat' ] }
- 
- ##
-@@ -3668,6 +3668,28 @@
-             '*tag': 'str' } }
- 
- ##
-+# @BlockdevOptionsVitastor:
-+#
-+# Driver specific block device options for vitastor
-+#
-+# @image:       Image name
-+# @inode:       Inode number
-+# @pool:        Pool ID
-+# @size:        Desired image size in bytes
-+# @config-path: Path to Vitastor configuration
-+# @etcd-host:   etcd connection address(es)
-+# @etcd-prefix: etcd key/value prefix
-+##
-+{ 'struct': 'BlockdevOptionsVitastor',
-+  'data': { '*inode': 'uint64',
-+            '*pool': 'uint64',
-+            '*size': 'uint64',
-+            '*image': 'str',
-+            '*config-path': 'str',
-+            '*etcd-host': 'str',
-+            '*etcd-prefix': 'str' } }
-+
-+##
- # @ReplicationMode:
- #
- # An enumeration of replication modes.
-@@ -4015,6 +4037,7 @@
-       'replication': { 'type': 'BlockdevOptionsReplication',
-                        'if': 'defined(CONFIG_REPLICATION)' },
-       'sheepdog':   'BlockdevOptionsSheepdog',
-+      'vitastor':   'BlockdevOptionsVitastor',
-       'ssh':        'BlockdevOptionsSsh',
-       'throttle':   'BlockdevOptionsThrottle',
-       'vdi':        'BlockdevOptionsGenericFormat',
-@@ -4404,6 +4427,17 @@
-             '*cluster-size' :   'size' } }
- 
- ##
-+# @BlockdevCreateOptionsVitastor:
-+#
-+# Driver specific image creation options for Vitastor.
-+#
-+# @size: Size of the virtual disk in bytes
-+##
-+{ 'struct': 'BlockdevCreateOptionsVitastor',
-+  'data': { 'location':         'BlockdevOptionsVitastor',
-+            'size':             'size' } }
-+
-+##
- # @BlockdevVmdkSubformat:
- #
- # Subformat options for VMDK images
-@@ -4665,6 +4699,7 @@
-       'qed':            'BlockdevCreateOptionsQed',
-       'rbd':            'BlockdevCreateOptionsRbd',
-       'sheepdog':       'BlockdevCreateOptionsSheepdog',
-+      'vitastor':       'BlockdevCreateOptionsVitastor',
-       'ssh':            'BlockdevCreateOptionsSsh',
-       'vdi':            'BlockdevCreateOptionsVdi',
-       'vhdx':           'BlockdevCreateOptionsVhdx',
-Index: qemu-5.2+dfsg/block/meson.build
-===================================================================
---- qemu-5.2+dfsg.orig/block/meson.build
-+++ qemu-5.2+dfsg/block/meson.build
-@@ -76,6 +76,7 @@ foreach m : [
-   ['CONFIG_LIBNFS', 'nfs', libnfs, 'nfs.c'],
-   ['CONFIG_LIBSSH', 'ssh', libssh, 'ssh.c'],
-   ['CONFIG_RBD', 'rbd', rbd, 'rbd.c'],
-+  ['CONFIG_VITASTOR', 'vitastor', vitastor, 'vitastor.c'],
- ]
-   if config_host.has_key(m[0])
-     if enable_modules
-Index: qemu-5.2+dfsg/configure
-===================================================================
---- qemu-5.2+dfsg.orig/configure
-+++ qemu-5.2+dfsg/configure
-@@ -372,6 +372,7 @@ trace_backends="log"
- trace_file="trace"
- spice=""
- rbd=""
-+vitastor=""
- smartcard=""
- u2f="auto"
- libusb=""
-@@ -1263,6 +1264,10 @@ for opt do
-   ;;
-   --enable-rbd) rbd="yes"
-   ;;
-+  --disable-vitastor) vitastor="no"
-+  ;;
-+  --enable-vitastor) vitastor="yes"
-+  ;;
-   --disable-xfsctl) xfs="no"
-   ;;
-   --enable-xfsctl) xfs="yes"
-@@ -1827,6 +1832,7 @@ disabled with --disable-FEATURE, default
-   vhost-vdpa      vhost-vdpa kernel backend support
-   spice           spice
-   rbd             rados block device (rbd)
-+  vitastor        vitastor block device
-   libiscsi        iscsi support
-   libnfs          nfs support
-   smartcard       smartcard support (libcacard)
-@@ -3719,6 +3725,27 @@ EOF
- fi
- 
- ##########################################
-+# vitastor probe
-+if test "$vitastor" != "no" ; then
-+  cat > $TMPC <<EOF
-+#include <vitastor_c.h>
-+int main(void) {
-+  vitastor_c_create_qemu(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
-+  return 0;
-+}
-+EOF
-+  vitastor_libs="-lvitastor_client"
-+  if compile_prog "" "$vitastor_libs" ; then
-+    vitastor=yes
-+  else
-+    if test "$vitastor" = "yes" ; then
-+      feature_not_found "vitastor block device" "Install vitastor-client-dev"
-+    fi
-+    vitastor=no
-+  fi
-+fi
-+
-+##########################################
- # libssh probe
- if test "$libssh" != "no" ; then
-   if $pkg_config --exists libssh; then
-@@ -6456,6 +6483,10 @@ if test "$rbd" = "yes" ; then
-   echo "CONFIG_RBD=y" >> $config_host_mak
-   echo "RBD_LIBS=$rbd_libs" >> $config_host_mak
- fi
-+if test "$vitastor" = "yes" ; then
-+  echo "CONFIG_VITASTOR=y" >> $config_host_mak
-+  echo "VITASTOR_LIBS=$vitastor_libs" >> $config_host_mak
-+fi
- 
- echo "CONFIG_COROUTINE_BACKEND=$coroutine" >> $config_host_mak
- if test "$coroutine_pool" = "yes" ; then
-Index: qemu-5.2+dfsg/meson.build
-===================================================================
---- qemu-5.2+dfsg.orig/meson.build
-+++ qemu-5.2+dfsg/meson.build
-@@ -596,6 +596,10 @@ rbd = not_found
- if 'CONFIG_RBD' in config_host
-   rbd = declare_dependency(link_args: config_host['RBD_LIBS'].split())
- endif
-+vitastor = not_found
-+if 'CONFIG_VITASTOR' in config_host
-+  vitastor = declare_dependency(link_args: config_host['VITASTOR_LIBS'].split())
-+endif
- glusterfs = not_found
- if 'CONFIG_GLUSTERFS' in config_host
-   glusterfs = declare_dependency(compile_args: config_host['GLUSTERFS_CFLAGS'].split(),
-@@ -2145,6 +2149,7 @@ endif
- # TODO: add back protocol and server version
- summary_info += {'spice support':     config_host.has_key('CONFIG_SPICE')}
- summary_info += {'rbd support':       config_host.has_key('CONFIG_RBD')}
-+summary_info += {'vitastor support':  config_host.has_key('CONFIG_VITASTOR')}
- summary_info += {'xfsctl support':    config_host.has_key('CONFIG_XFS')}
- summary_info += {'smartcard support': config_host.has_key('CONFIG_SMARTCARD')}
- summary_info += {'U2F support':       u2f.found()}

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-1.0.0/#' --exclude 'rpm/*.rpm' -czf $VITASTOR/../vitastor-1.0.0$(rpm --eval '%dist').tar.gz *
+tar --transform 's#^#vitastor-0.9.3/#' --exclude 'rpm/*.rpm' -czf $VITASTOR/../vitastor-0.9.3$(rpm --eval '%dist').tar.gz *

rpm/qemu-kvm-4.2-el7.spec.patch

@@ -22,7 +22,7 @@
  Name: qemu-kvm
  Version: 4.2.0
 -Release: 29.vitastor%{?dist}.6
-+Release: 34.vitastor%{?dist}.6
++Release: 32.vitastor%{?dist}.6
  # Epoch because we pushed a qemu-1.0 package. AIUI this can't ever be dropped
  Epoch: 15
  License: GPLv2 and GPLv2+ and CC-BY

rpm/qemu-kvm-4.2-el8.spec.patch

@@ -13,7 +13,7 @@
  Name: qemu-kvm
  Version: 4.2.0
 -Release: 29%{?dist}.6
-+Release: 33.vitastor%{?dist}.6
++Release: 32.vitastor%{?dist}.6
  # Epoch because we pushed a qemu-1.0 package. AIUI this can't ever be dropped
  Epoch: 15
  License: GPLv2 and GPLv2+ and CC-BY

rpm/qemu-kvm-6.2-el8.spec.patch

@@ -1,103 +0,0 @@
---- qemu-kvm-6.2.spec.orig	2023-07-18 13:52:57.636625440 +0000
-+++ qemu-kvm-6.2.spec	2023-07-18 13:52:19.011683886 +0000
-@@ -73,6 +73,7 @@ Requires: %{name}-hw-usbredir = %{epoch}
- %endif                                                           \
- Requires: %{name}-block-iscsi = %{epoch}:%{version}-%{release}   \
- Requires: %{name}-block-rbd = %{epoch}:%{version}-%{release}     \
-+Requires: %{name}-block-vitastor = %{epoch}:%{version}-%{release}\
- Requires: %{name}-block-ssh = %{epoch}:%{version}-%{release}
- 
- # Macro to properly setup RHEL/RHEV conflict handling
-@@ -83,7 +84,7 @@ Obsoletes: %1-rhev <= %{epoch}:%{version
- Summary: QEMU is a machine emulator and virtualizer
- Name: qemu-kvm
- Version: 6.2.0
--Release: 32%{?rcrel}%{?dist}
-+Release: 32.vitastor%{?rcrel}%{?dist}
- # Epoch because we pushed a qemu-1.0 package. AIUI this can't ever be dropped
- Epoch: 15
- License: GPLv2 and GPLv2+ and CC-BY
-@@ -122,6 +123,7 @@ Source37: tests_data_acpi_pc_SSDT.dimmpx
- Source38: tests_data_acpi_q35_FACP.slic
- Source39: tests_data_acpi_q35_SSDT.dimmpxm
- Source40: tests_data_acpi_virt_SSDT.memhp
-+Source41: qemu-vitastor.c
- 
- Patch0001: 0001-redhat-Adding-slirp-to-the-exploded-tree.patch
- Patch0005: 0005-Initial-redhat-build.patch
-@@ -652,6 +654,7 @@ Patch255: kvm-scsi-protect-req-aiocb-wit
- Patch256: kvm-dma-helpers-prevent-dma_blk_cb-vs-dma_aio_cancel-rac.patch
- # For bz#2090990 - qemu crash with error scsi_req_unref(SCSIRequest *): Assertion `req->refcount > 0' failed or scsi_dma_complete(void *, int): Assertion `r->req.aiocb != NULL' failed [8.7.0]
- Patch257: kvm-virtio-scsi-reset-SCSI-devices-from-main-loop-thread.patch
-+Patch258: qemu-6.2-vitastor.patch
- 
- BuildRequires: wget
- BuildRequires: rpm-build
-@@ -689,6 +692,7 @@ BuildRequires: libcurl-devel
- BuildRequires: libssh-devel
- BuildRequires: librados-devel
- BuildRequires: librbd-devel
-+BuildRequires: vitastor-client-devel
- %if %{have_gluster}
- # For gluster block driver
- BuildRequires: glusterfs-api-devel
-@@ -926,6 +930,14 @@ Install this package if you want to acce
- using the rbd protocol.
- 
- 
-+%package  block-vitastor
-+Summary: QEMU Vitastor block driver
-+Requires: %{name}-common%{?_isa} = %{epoch}:%{version}-%{release}
-+
-+%description block-vitastor
-+This package provides the additional Vitastor block driver for QEMU.
-+
-+
- %package  block-ssh
- Summary: QEMU SSH block driver
- Requires: %{name}-common%{?_isa} = %{epoch}:%{version}-%{release}
-@@ -979,6 +991,7 @@ This package provides usbredir support.
- rm -fr slirp
- mkdir slirp
- %autopatch -p1
-+cp %{SOURCE41} ./block/vitastor.c
- 
- %global qemu_kvm_build qemu_kvm_build
- mkdir -p %{qemu_kvm_build}
-@@ -994,7 +1007,7 @@ cp -f %{SOURCE40} tests/data/acpi/virt/S
- # --build-id option is used for giving info to the debug packages.
- buildldflags="VL_LDFLAGS=-Wl,--build-id"
- 
--%global block_drivers_list qcow2,raw,file,host_device,nbd,iscsi,rbd,blkdebug,luks,null-co,nvme,copy-on-read,throttle
-+%global block_drivers_list qcow2,raw,file,host_device,nbd,iscsi,rbd,vitastor,blkdebug,luks,null-co,nvme,copy-on-read,throttle
- 
- %if 0%{have_gluster}
-     %global block_drivers_list %{block_drivers_list},gluster
-@@ -1149,9 +1162,7 @@ pushd %{qemu_kvm_build}
-   --firmwarepath=%{_prefix}/share/qemu-firmware \
-   --meson="git" \
-   --target-list="%{buildarch}" \
--  --block-drv-rw-whitelist=%{block_drivers_list} \
-   --audio-drv-list= \
--  --block-drv-ro-whitelist=vmdk,vhdx,vpc,https,ssh \
-   --with-coroutine=ucontext \
-   --with-git=git \
-   --tls-priority=@QEMU,SYSTEM \
-@@ -1197,6 +1208,7 @@ pushd %{qemu_kvm_build}
- %endif
-   --enable-pie \
-   --enable-rbd \
-+  --enable-vitastor \
- %if 0%{have_librdma}
-   --enable-rdma \
- %endif
-@@ -1794,6 +1806,9 @@ sh %{_sysconfdir}/sysconfig/modules/kvm.
- %files block-rbd
- %{_libdir}/qemu-kvm/block-rbd.so
- 
-+%files block-vitastor
-+%{_libdir}/qemu-kvm/block-vitastor.so
-+
- %files block-ssh
- %{_libdir}/qemu-kvm/block-ssh.so
- 

rpm/qemu-kvm-7.2-el9.spec.patch

@@ -1,93 +0,0 @@
---- qemu-kvm-7.2.spec.orig	2023-06-22 13:56:19.000000000 +0000
-+++ qemu-kvm-7.2.spec	2023-07-18 07:55:22.347090196 +0000
-@@ -100,8 +100,6 @@
- %endif
- 
- %global target_list %{kvm_target}-softmmu
--%global block_drivers_rw_list qcow2,raw,file,host_device,nbd,iscsi,rbd,blkdebug,luks,null-co,nvme,copy-on-read,throttle,compress
--%global block_drivers_ro_list vdi,vmdk,vhdx,vpc,https
- %define qemudocdir %{_docdir}/%{name}
- %global firmwaredirs "%{_datadir}/qemu-firmware:%{_datadir}/ipxe/qemu:%{_datadir}/seavgabios:%{_datadir}/seabios"
- 
-@@ -126,6 +124,7 @@ Requires: %{name}-device-usb-host = %{ep
- Requires: %{name}-device-usb-redirect = %{epoch}:%{version}-%{release}   \
- %endif                                                           \
- Requires: %{name}-block-rbd = %{epoch}:%{version}-%{release}     \
-+Requires: %{name}-block-vitastor = %{epoch}:%{version}-%{release}\
- Requires: %{name}-audio-pa = %{epoch}:%{version}-%{release}
- 
- # Since SPICE is removed from RHEL-9, the following Obsoletes:
-@@ -148,7 +147,7 @@ Obsoletes: %{name}-block-ssh <= %{epoch}
- Summary: QEMU is a machine emulator and virtualizer
- Name: qemu-kvm
- Version: 7.2.0
--Release: 14%{?rcrel}%{?dist}%{?cc_suffix}.1
-+Release: 14.vitastor%{?rcrel}%{?dist}%{?cc_suffix}.1
- # Epoch because we pushed a qemu-1.0 package. AIUI this can't ever be dropped
- # Epoch 15 used for RHEL 8
- # Epoch 17 used for RHEL 9 (due to release versioning offset in RHEL 8.5)
-@@ -171,6 +170,7 @@ Source28: 95-kvm-memlock.conf
- Source30: kvm-s390x.conf
- Source31: kvm-x86.conf
- Source36: README.tests
-+Source37: qemu-vitastor.c
- 
- 
- Patch0004: 0004-Initial-redhat-build.patch
-@@ -418,6 +418,7 @@ Patch134: kvm-target-i386-Fix-BZHI-instr
- Patch135: kvm-intel-iommu-fail-DEVIOTLB_UNMAP-without-dt-mode.patch
- # For bz#2203745 - Disk detach is unsuccessful while the guest is still booting [rhel-9.2.0.z]
- Patch136: kvm-acpi-pcihp-allow-repeating-hot-unplug-requests.patch
-+Patch137: qemu-7.2-vitastor.patch
- 
- %if %{have_clang}
- BuildRequires: clang
-@@ -449,6 +450,7 @@ BuildRequires: libcurl-devel
- %if %{have_block_rbd}
- BuildRequires: librbd-devel
- %endif
-+BuildRequires: vitastor-client-devel
- # We need both because the 'stap' binary is probed for by configure
- BuildRequires: systemtap
- BuildRequires: systemtap-sdt-devel
-@@ -642,6 +644,14 @@ using the rbd protocol.
- %endif
- 
- 
-+%package  block-vitastor
-+Summary: QEMU Vitastor block driver
-+Requires: %{name}-common%{?_isa} = %{epoch}:%{version}-%{release}
-+
-+%description block-vitastor
-+This package provides the additional Vitastor block driver for QEMU.
-+
-+
- %package  audio-pa
- Summary: QEMU PulseAudio audio driver
- Requires: %{name}-common%{?_isa} = %{epoch}:%{version}-%{release}
-@@ -719,6 +729,7 @@ This package provides usbredir support.
- %prep
- %setup -q -n qemu-%{version}%{?rcstr}
- %autopatch -p1
-+cp %{SOURCE37} ./block/vitastor.c
- 
- %global qemu_kvm_build qemu_kvm_build
- mkdir -p %{qemu_kvm_build}
-@@ -946,6 +957,7 @@ run_configure \
- %if %{have_block_rbd}
-   --enable-rbd \
- %endif
-+  --enable-vitastor \
- %if %{have_librdma}
-   --enable-rdma \
- %endif
-@@ -1426,6 +1438,9 @@ useradd -r -u 107 -g qemu -G kvm -d / -s
- %files block-rbd
- %{_libdir}/%{name}/block-rbd.so
- %endif
-+%files block-vitastor
-+%{_libdir}/%{name}/block-vitastor.so
-+
- %files audio-pa
- %{_libdir}/%{name}/audio-pa.so
- 

rpm/vitastor-el7.Dockerfile

@@ -35,7 +35,7 @@ ADD . /root/vitastor
 RUN set -e; \
     cd /root/vitastor/rpm; \
     sh build-tarball.sh; \
-    cp /root/vitastor-1.0.0.el7.tar.gz ~/rpmbuild/SOURCES; \
+    cp /root/vitastor-0.9.3.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:        1.0.0
+Version:        0.9.3
 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-1.0.0.el7.tar.gz
+Source0:        vitastor-0.9.3.el7.tar.gz
 
 BuildRequires:  liburing-devel >= 0.6
 BuildRequires:  gperftools-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-1.0.0.el8.tar.gz ~/rpmbuild/SOURCES; \
+    cp /root/vitastor-0.9.3.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:        1.0.0
+Version:        0.9.3
 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-1.0.0.el8.tar.gz
+Source0:        vitastor-0.9.3.el8.tar.gz
 
 BuildRequires:  liburing-devel >= 0.6
 BuildRequires:  gperftools-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-1.0.0.el9.tar.gz ~/rpmbuild/SOURCES; \
+    cp /root/vitastor-0.9.3.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:        1.0.0
+Version:        0.9.3
 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-1.0.0.el9.tar.gz
+Source0:        vitastor-0.9.3.el9.tar.gz
 
 BuildRequires:  liburing-devel >= 0.6
 BuildRequires:  gperftools-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="1.0.0")
+add_definitions(-DVERSION="0.9.3")
 add_definitions(-Wall -Wno-sign-compare -Wno-comment -Wno-parentheses -Wno-pointer-arith -fdiagnostics-color=always -I ${CMAKE_SOURCE_DIR}/src)
 if (${WITH_ASAN})
 	add_definitions(-fsanitize=address -fno-omit-frame-pointer)

src/blockstore_disk.cpp

@@ -45,13 +45,13 @@ void blockstore_disk_t::parse_config(std::map<std::string, std::string> & config
     meta_block_size = parse_size(config["meta_block_size"]);
     bitmap_granularity = parse_size(config["bitmap_granularity"]);
     meta_format = stoull_full(config["meta_format"]);
-    cached_io_data = config["cached_io_data"] == "true" || config["cached_io_data"] == "yes" || config["cached_io_data"] == "1";
-    cached_io_meta = cached_io_data && (meta_device == data_device || meta_device == "") &&
-        config.find("cached_io_meta") == config.end() ||
-        config["cached_io_meta"] == "true" || config["cached_io_meta"] == "yes" || config["cached_io_meta"] == "1";
-    cached_io_journal = cached_io_meta && (journal_device == meta_device || journal_device == "") &&
-        config.find("cached_io_journal") == config.end() ||
-        config["cached_io_journal"] == "true" || config["cached_io_journal"] == "yes" || config["cached_io_journal"] == "1";
+    cached_read_data = config["cached_read_data"] == "true" || config["cached_read_data"] == "yes" || config["cached_read_data"] == "1";
+    cached_read_meta = cached_read_data && (meta_device == data_device || meta_device == "") &&
+        config.find("cached_read_meta") == config.end() ||
+        config["cached_read_meta"] == "true" || config["cached_read_meta"] == "yes" || config["cached_read_meta"] == "1";
+    cached_read_journal = cached_read_meta && (journal_device == meta_device || journal_device == "") &&
+        config.find("cached_read_journal") == config.end() ||
+        config["cached_read_journal"] == "true" || config["cached_read_journal"] == "yes" || config["cached_read_journal"] == "1";
     if (config["data_csum_type"] == "crc32c")
     {
         data_csum_type = BLOCKSTORE_CSUM_CRC32C;
@@ -274,7 +274,7 @@ static void check_size(int fd, uint64_t *size, uint64_t *sectsize, std::string n
 
 void blockstore_disk_t::open_data()
 {
-    data_fd = open(data_device.c_str(), (cached_io_data ? O_SYNC : O_DIRECT) | O_RDWR);
+    data_fd = open(data_device.c_str(), O_DIRECT|O_RDWR);
     if (data_fd == -1)
     {
         throw std::runtime_error("Failed to open data device "+data_device+": "+std::string(strerror(errno)));
@@ -295,13 +295,25 @@ void blockstore_disk_t::open_data()
     {
         throw std::runtime_error(std::string("Failed to lock data device: ") + strerror(errno));
     }
+    if (cached_read_data)
+    {
+        read_data_fd = open(data_device.c_str(), O_RDWR);
+        if (read_data_fd == -1)
+        {
+            throw std::runtime_error("Failed to open data device "+data_device+": "+std::string(strerror(errno)));
+        }
+    }
+    else
+    {
+        read_data_fd = data_fd;
+    }
 }
 
 void blockstore_disk_t::open_meta()
 {
-    if (meta_device != data_device || cached_io_meta != cached_io_data)
+    if (meta_device != data_device)
     {
-        meta_fd = open(meta_device.c_str(), (cached_io_meta ? O_SYNC : O_DIRECT) | O_RDWR);
+        meta_fd = open(meta_device.c_str(), O_DIRECT|O_RDWR);
         if (meta_fd == -1)
         {
             throw std::runtime_error("Failed to open metadata device "+meta_device+": "+std::string(strerror(errno)));
@@ -311,10 +323,22 @@ void blockstore_disk_t::open_meta()
         {
             throw std::runtime_error("meta_offset exceeds device size = "+std::to_string(meta_device_size));
         }
-        if (!disable_flock && meta_device != data_device && flock(meta_fd, LOCK_EX|LOCK_NB) != 0)
+        if (!disable_flock && flock(meta_fd, LOCK_EX|LOCK_NB) != 0)
         {
             throw std::runtime_error(std::string("Failed to lock metadata device: ") + strerror(errno));
         }
+        if (cached_read_meta)
+        {
+            read_meta_fd = open(meta_device.c_str(), O_RDWR);
+            if (read_meta_fd == -1)
+            {
+                throw std::runtime_error("Failed to open metadata device "+meta_device+": "+std::string(strerror(errno)));
+            }
+        }
+        else
+        {
+            read_meta_fd = meta_fd;
+        }
     }
     else
     {
@@ -333,19 +357,35 @@ void blockstore_disk_t::open_meta()
             ") is not a multiple of data device sector size ("+std::to_string(meta_device_sect)+")"
         );
     }
+    if (!cached_read_meta)
+    {
+        read_meta_fd = meta_fd;
+    }
+    else if (meta_device == data_device && cached_read_data)
+    {
+        read_meta_fd = read_data_fd;
+    }
+    else
+    {
+        read_meta_fd = open(meta_device.c_str(), O_RDWR);
+        if (read_meta_fd == -1)
+        {
+            throw std::runtime_error("Failed to open metadata device "+meta_device+": "+std::string(strerror(errno)));
+        }
+    }
 }
 
 void blockstore_disk_t::open_journal()
 {
-    if (journal_device != meta_device || cached_io_journal != cached_io_meta)
+    if (journal_device != meta_device)
     {
-        journal_fd = open(journal_device.c_str(), (cached_io_journal ? O_SYNC : O_DIRECT) | O_RDWR);
+        journal_fd = open(journal_device.c_str(), O_DIRECT|O_RDWR);
         if (journal_fd == -1)
         {
             throw std::runtime_error("Failed to open journal device "+journal_device+": "+std::string(strerror(errno)));
         }
         check_size(journal_fd, &journal_device_size, &journal_device_sect, "journal device");
-        if (!disable_flock && journal_device != meta_device && flock(journal_fd, LOCK_EX|LOCK_NB) != 0)
+        if (!disable_flock && flock(journal_fd, LOCK_EX|LOCK_NB) != 0)
         {
             throw std::runtime_error(std::string("Failed to lock journal device: ") + strerror(errno));
         }
@@ -367,6 +407,26 @@ void blockstore_disk_t::open_journal()
             ") is not a multiple of journal device sector size ("+std::to_string(journal_device_sect)+")"
         );
     }
+    if (!cached_read_journal)
+    {
+        read_journal_fd = journal_fd;
+    }
+    else if (journal_device == meta_device && cached_read_meta)
+    {
+        read_journal_fd = read_meta_fd;
+    }
+    else if (journal_device == data_device && cached_read_data)
+    {
+        read_journal_fd = read_data_fd;
+    }
+    else
+    {
+        read_journal_fd = open(journal_device.c_str(), O_RDWR);
+        if (read_journal_fd == -1)
+        {
+            throw std::runtime_error("Failed to open journal device "+journal_device+": "+std::string(strerror(errno)));
+        }
+    }
 }
 
 void blockstore_disk_t::close_all()
@@ -377,5 +437,12 @@ void blockstore_disk_t::close_all()
         close(meta_fd);
     if (journal_fd >= 0 && journal_fd != meta_fd)
         close(journal_fd);
+    if (read_data_fd >= 0 && read_data_fd != data_fd)
+        close(read_data_fd);
+    if (read_meta_fd >= 0 && read_meta_fd != meta_fd)
+        close(read_meta_fd);
+    if (read_journal_fd >= 0 && read_journal_fd != journal_fd)
+        close(read_journal_fd);
     data_fd = meta_fd = journal_fd = -1;
+    read_data_fd = read_meta_fd = read_journal_fd = -1;
 }

src/blockstore_disk.h

@@ -31,10 +31,11 @@ struct blockstore_disk_t
     uint32_t csum_block_size = 4096;
     // By default, Blockstore locks all opened devices exclusively. This option can be used to disable locking
     bool disable_flock = false;
-    // Use Linux page cache for reads and writes, i.e. open FDs with O_SYNC instead of O_DIRECT
-    bool cached_io_data = false, cached_io_meta = false, cached_io_journal = false;
+    // Use linux page cache for reads. If enabled, separate buffered FDs will be opened for reading
+    bool cached_read_data = false, cached_read_meta = false, cached_read_journal = false;
 
     int meta_fd = -1, data_fd = -1, journal_fd = -1;
+    int read_meta_fd = -1, read_data_fd = -1, read_journal_fd = -1;
     uint64_t meta_offset, meta_device_sect, meta_device_size, meta_len, meta_format = 0;
     uint64_t data_offset, data_device_sect, data_device_size, data_len;
     uint64_t journal_offset, journal_device_sect, journal_device_size, journal_len;

src/blockstore_flush.cpp

@@ -1087,7 +1087,7 @@ bool journal_flusher_co::read_dirty(int wait_base)
         data->iov = (struct iovec){ vi.buf, vi.len };
         data->callback = simple_callback_r;
         my_uring_prep_readv(
-            sqe, bs->dsk.data_fd, &data->iov, 1, bs->dsk.data_offset + old_clean_loc + vi.offset
+            sqe, bs->dsk.read_data_fd, &data->iov, 1, bs->dsk.data_offset + old_clean_loc + vi.offset
         );
         wait_count++;
         bs->find_holes(v, vi.offset, vi.offset+vi.len, [this, buf = (uint8_t*)vi.buf-vi.offset](int pos, bool alloc, uint32_t cur_start, uint32_t cur_end)
@@ -1119,7 +1119,7 @@ bool journal_flusher_co::read_dirty(int wait_base)
                 data->iov = (struct iovec){ v[i].buf, (size_t)v[i].len };
                 data->callback = simple_callback_rj;
                 my_uring_prep_readv(
-                    sqe, bs->dsk.journal_fd, &data->iov, 1, bs->journal.offset + v[i].disk_offset
+                    sqe, bs->dsk.read_journal_fd, &data->iov, 1, bs->journal.offset + v[i].disk_offset
                 );
                 wait_journal_count++;
             }
@@ -1212,7 +1212,7 @@ bool journal_flusher_co::modify_meta_read(uint64_t meta_loc, flusher_meta_write_
         data->callback = simple_callback_r;
         wr.submitted = true;
         my_uring_prep_readv(
-            sqe, bs->dsk.meta_fd, &data->iov, 1, bs->dsk.meta_offset + bs->dsk.meta_block_size + wr.sector
+            sqe, bs->dsk.read_meta_fd, &data->iov, 1, bs->dsk.meta_offset + bs->dsk.meta_block_size + wr.sector
         );
         wait_count++;
     }

src/blockstore_init.cpp

@@ -65,7 +65,7 @@ int blockstore_init_meta::loop()
     GET_SQE();
     data->iov = { metadata_buffer, 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);
+    my_uring_prep_readv(sqe, bs->dsk.read_meta_fd, &data->iov, 1, bs->dsk.meta_offset);
     bs->ringloop->submit();
     submitted++;
 resume_1:
@@ -202,7 +202,7 @@ resume_2:
                 data->iov = { bufs[i].buf, bufs[i].size };
                 data->callback = [this, i](ring_data_t *data) { handle_event(data, i); };
                 if (!zero_on_init)
-                    my_uring_prep_readv(sqe, bs->dsk.meta_fd, &data->iov, 1, bs->dsk.meta_offset + bufs[i].offset);
+                    my_uring_prep_readv(sqe, bs->dsk.read_meta_fd, &data->iov, 1, bs->dsk.meta_offset + bufs[i].offset);
                 else
                 {
                     // Fill metadata with zeroes
@@ -259,7 +259,7 @@ resume_2:
             GET_SQE();
             data->iov = { metadata_buffer, 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);
+            my_uring_prep_readv(sqe, bs->dsk.read_meta_fd, &data->iov, 1, bs->dsk.meta_offset + (1+next_offset)*bs->dsk.meta_block_size);
             submitted++;
 resume_5:
             if (submitted > 0)
@@ -467,7 +467,7 @@ int blockstore_init_journal::loop()
     data = ((ring_data_t*)sqe->user_data);
     data->iov = { submitted_buf, bs->journal.block_size };
     data->callback = simple_callback;
-    my_uring_prep_readv(sqe, bs->dsk.journal_fd, &data->iov, 1, bs->journal.offset);
+    my_uring_prep_readv(sqe, bs->dsk.read_journal_fd, &data->iov, 1, bs->journal.offset);
     bs->ringloop->submit();
     wait_count = 1;
 resume_1:
@@ -607,7 +607,7 @@ resume_1:
                     end - journal_pos < JOURNAL_BUFFER_SIZE ? end - journal_pos : JOURNAL_BUFFER_SIZE,
                 };
                 data->callback = [this](ring_data_t *data1) { handle_event(data1); };
-                my_uring_prep_readv(sqe, bs->dsk.journal_fd, &data->iov, 1, bs->journal.offset + journal_pos);
+                my_uring_prep_readv(sqe, bs->dsk.read_journal_fd, &data->iov, 1, bs->journal.offset + journal_pos);
                 bs->ringloop->submit();
             }
             while (done.size() > 0)

src/blockstore_open.cpp

@@ -85,13 +85,11 @@ void blockstore_impl_t::parse_config(blockstore_config_t & config, bool init)
         immediate_commit = IMMEDIATE_SMALL;
     }
     metadata_buf_size = strtoull(config["meta_buf_size"].c_str(), NULL, 10);
-    inmemory_meta = config["inmemory_metadata"] != "false" && config["inmemory_metadata"] != "0" &&
-        config["inmemory_metadata"] != "no";
+    inmemory_meta = config["inmemory_metadata"] != "false";
     journal.sector_count = strtoull(config["journal_sector_buffer_count"].c_str(), NULL, 10);
     journal.no_same_sector_overwrites = config["journal_no_same_sector_overwrites"] == "true" ||
         config["journal_no_same_sector_overwrites"] == "1" || config["journal_no_same_sector_overwrites"] == "yes";
-    journal.inmemory = config["inmemory_journal"] != "false" && config["inmemory_journal"] != "0" &&
-        config["inmemory_journal"] != "no";
+    journal.inmemory = config["inmemory_journal"] != "false";
     // Validate
     if (journal.sector_count < 2)
     {

src/blockstore_read.cpp

@@ -29,7 +29,7 @@ int blockstore_impl_t::fulfill_read_push(blockstore_op_t *op, void *buf, uint64_
     PRIV(op)->pending_ops++;
     my_uring_prep_readv(
         sqe,
-        IS_JOURNAL(item_state) ? dsk.journal_fd : dsk.data_fd,
+        IS_JOURNAL(item_state) ? dsk.read_journal_fd : dsk.read_data_fd,
         &data->iov, 1,
         (IS_JOURNAL(item_state) ? dsk.journal_offset : dsk.data_offset) + offset
     );
@@ -348,7 +348,7 @@ bool blockstore_impl_t::read_checksum_block(blockstore_op_t *op, int rv_pos, uin
         .csum_buf = vi->csum_buf,
         .dyn_data = vi->dyn_data,
     };
-    int submit_fd = (vi->copy_flags & COPY_BUF_JOURNAL ? dsk.journal_fd : dsk.data_fd);
+    int submit_fd = (vi->copy_flags & COPY_BUF_JOURNAL ? dsk.read_journal_fd : dsk.read_data_fd);
     uint64_t submit_offset = (vi->copy_flags & COPY_BUF_JOURNAL ? journal.offset : dsk.data_offset);
     uint32_t d_pos = 0;
     for (int n_pos = 0; n_pos < n_iov; n_pos += IOV_MAX)
@@ -702,7 +702,7 @@ uint8_t* blockstore_impl_t::read_clean_meta_block(blockstore_op_t *op, uint64_t
     BS_SUBMIT_GET_SQE(sqe, data);
     data->iov = (struct iovec){ buf, dsk.meta_block_size };
     PRIV(op)->pending_ops++;
-    my_uring_prep_readv(sqe, dsk.meta_fd, &data->iov, 1, dsk.meta_offset + dsk.meta_block_size + sector);
+    my_uring_prep_readv(sqe, dsk.read_meta_fd, &data->iov, 1, dsk.meta_offset + dsk.meta_block_size + sector);
     data->callback = [this, op](ring_data_t *data) { handle_read_event(data, op); };
     // return pointer to checksums + bitmap
     return buf + pos + sizeof(clean_disk_entry);

src/cli_ls.cpp

@@ -56,15 +56,14 @@ struct image_lister_t
             {
                 continue;
             }
-            auto pool_it = parent->cli->st_cli.pool_config.find(INODE_POOL(ic.second.num));
-            bool good_pool = pool_it != parent->cli->st_cli.pool_config.end();
+            auto & pool_cfg = parent->cli->st_cli.pool_config.at(INODE_POOL(ic.second.num));
             auto item = json11::Json::object {
                 { "name", ic.second.name },
                 { "size", ic.second.size },
                 { "used_size", 0 },
                 { "readonly", ic.second.readonly },
                 { "pool_id", (uint64_t)INODE_POOL(ic.second.num) },
-                { "pool_name", good_pool ? pool_it->second.name : "? (ID:"+std::to_string(INODE_POOL(ic.second.num))+")" },
+                { "pool_name", pool_cfg.name },
                 { "inode_num", INODE_NO_POOL(ic.second.num) },
                 { "inode_id", ic.second.num },
             };
@@ -248,8 +247,6 @@ resume_1:
         if (state == 1)
             goto resume_1;
         get_list();
-        if (state == 100)
-            return;
         if (show_stats)
         {
 resume_1:
@@ -272,7 +269,7 @@ resume_1:
             { "key", "name" },
             { "title", "NAME" },
         });
-        if (list_pool_name == "")
+        if (!list_pool_id)
         {
             cols.push_back(json11::Json::object{
                 { "key", "pool_name" },
@@ -379,18 +376,16 @@ resume_1:
 
 std::string print_table(json11::Json items, json11::Json header, bool use_esc)
 {
-    int header_sizes[header.array_items().size()];
     std::vector<int> sizes;
     for (int i = 0; i < header.array_items().size(); i++)
     {
-        header_sizes[i] = utf8_length(header[i]["title"].string_value());
-        sizes.push_back(header_sizes[i]);
+        sizes.push_back(header[i]["title"].string_value().length());
     }
     for (auto & item: items.array_items())
     {
         for (int i = 0; i < header.array_items().size(); i++)
         {
-            int l = utf8_length(item[header[i]["key"].string_value()].as_string());
+            int l = item[header[i]["key"].string_value()].as_string().length();
             sizes[i] = sizes[i] < l ? l : sizes[i];
         }
     }
@@ -402,7 +397,7 @@ std::string print_table(json11::Json items, json11::Json header, bool use_esc)
             // Separator
             str += "  ";
         }
-        int pad = sizes[i]-header_sizes[i];
+        int pad = sizes[i]-header[i]["title"].string_value().length();
         if (header[i]["right"].bool_value())
         {
             // Align right
@@ -430,7 +425,7 @@ std::string print_table(json11::Json items, json11::Json header, bool use_esc)
                 // Separator
                 str += "  ";
             }
-            int pad = sizes[i] - utf8_length(item[header[i]["key"].string_value()].as_string());
+            int pad = sizes[i] - item[header[i]["key"].string_value()].as_string().length();
             if (header[i]["right"].bool_value())
             {
                 // Align right

src/cli_modify.cpp

@@ -13,7 +13,7 @@ struct image_changer_t
     std::string image_name;
     std::string new_name;
     uint64_t new_size = 0;
-    bool force_size = false, inc_size = false;
+    bool force_size = false;
     bool set_readonly = false, set_readwrite = false, force = false;
     // interval between fsyncs
     int fsync_interval = 128;
@@ -81,14 +81,14 @@ struct image_changer_t
         }
         if ((!set_readwrite || !cfg.readonly) &&
             (!set_readonly || cfg.readonly) &&
-            (!new_size && !force_size || cfg.size == new_size || cfg.size >= new_size && inc_size) &&
+            (!new_size && !force_size || cfg.size == new_size) &&
             (new_name == "" || new_name == image_name))
         {
             result = (cli_result_t){ .text = "No change" };
             state = 100;
             return;
         }
-        if ((new_size != 0 || force_size) && (cfg.size < new_size || !inc_size))
+        if (new_size != 0 || force_size)
         {
             if (cfg.size >= new_size)
             {
@@ -233,7 +233,6 @@ std::function<bool(cli_result_t &)> cli_tool_t::start_modify(json11::Json cfg)
     changer->new_name = cfg["rename"].string_value();
     changer->new_size = parse_size(cfg["resize"].as_string());
     changer->force_size = cfg["force_size"].bool_value();
-    changer->inc_size = cfg["inc_size"].bool_value();
     changer->force = cfg["force"].bool_value();
     changer->set_readonly = cfg["readonly"].bool_value();
     changer->set_readwrite = cfg["readwrite"].bool_value();

src/disk_tool.cpp

@@ -74,7 +74,7 @@ static const char *help_text =
     "  If it doesn't succeed it issues a warning in the system log.\n"
     "  \n"
     "  You can also pass other OSD options here as arguments and they'll be persisted\n"
-    "  in the superblock: cached_io_data, cached_io_meta, cached_io_journal,\n"
+    "  in the superblock: cached_read_data, cached_read_meta, cached_read_journal,\n"
     "  inmemory_metadata, inmemory_journal, max_write_iodepth,\n"
     "  min_flusher_count, max_flusher_count, journal_sector_buffer_count,\n"
     "  journal_no_same_sector_overwrites, throttle_small_writes, throttle_target_iops,\n"

src/disk_tool_prepare.cpp

@@ -8,9 +8,9 @@
 int disk_tool_t::prepare_one(std::map<std::string, std::string> options, int is_hdd)
 {
     static const char *allow_additional_params[] = {
-        "cached_io_data",
-        "cached_io_meta",
-        "cached_io_journal",
+        "cached_read_data",
+        "cached_read_meta",
+        "cached_read_journal",
         "max_write_iodepth",
         "max_write_iodepth",
         "min_flusher_count",
@@ -119,7 +119,7 @@ int disk_tool_t::prepare_one(std::map<std::string, std::string> options, int is_
     try
     {
         dsk.parse_config(options);
-        dsk.cached_io_data = dsk.cached_io_meta = dsk.cached_io_journal = false;
+        dsk.cached_read_data = dsk.cached_read_meta = dsk.cached_read_journal = false;
         dsk.open_data();
         dsk.open_meta();
         dsk.open_journal();
@@ -151,7 +151,7 @@ int disk_tool_t::prepare_one(std::map<std::string, std::string> options, int is_
         for (int i = 0; i < sizeof(allow_additional_params)/sizeof(allow_additional_params[0]); i++)
         {
             auto it = options.find(allow_additional_params[i]);
-            if (it != options.end() && it->second != "")
+            if (it != options.end())
             {
                 sb[it->first] = it->second;
             }
@@ -483,7 +483,7 @@ int disk_tool_t::get_meta_partition(std::vector<vitastor_dev_info_t> & ssds, std
     {
         blockstore_disk_t dsk;
         dsk.parse_config(options);
-        dsk.cached_io_data = dsk.cached_io_meta = dsk.cached_io_journal = false;
+        dsk.cached_read_data = dsk.cached_read_meta = dsk.cached_read_journal = false;
         dsk.open_data();
         dsk.open_meta();
         dsk.open_journal();
@@ -626,7 +626,7 @@ int disk_tool_t::prepare(std::vector<std::string> devices)
                     }
                 }
                 // Treat all disks as SSDs if not in the hybrid mode
-                prepare_one(options, dev.is_hdd ? 1 : 0);
+                prepare_one(options, hybrid && dev.is_hdd ? 1 : 0);
                 if (hybrid)
                 {
                     options.erase("journal_device");

src/disk_tool_resize.cpp

@@ -91,7 +91,7 @@ int disk_tool_t::resize_parse_params()
     try
     {
         dsk.parse_config(options);
-        dsk.cached_io_data = dsk.cached_io_meta = dsk.cached_io_journal = false;
+        dsk.cached_read_data = dsk.cached_read_meta = dsk.cached_read_journal = false;
         dsk.open_data();
         dsk.open_meta();
         dsk.open_journal();

src/disk_tool_utils.cpp

@@ -264,7 +264,6 @@ int write_zero(int fd, uint64_t offset, uint64_t size)
 {
     uint64_t buf_len = 1024*1024;
     void *zero_buf = memalign_or_die(MEM_ALIGNMENT, buf_len);
-    memset(zero_buf, 0, buf_len);
     ssize_t r;
     while (size > 0)
     {

src/nfs_conn.cpp

@@ -190,15 +190,7 @@ static int nfs3_setattr_proc(void *opaque, rpc_op_t *rop)
     {
         if (handle == "roothandle" || self->parent->dir_by_hash.find(handle) != self->parent->dir_by_hash.end())
         {
-            if (args->new_attributes.size.set_it)
-            {
-                *reply = (SETATTR3res){ .status = NFS3ERR_ISDIR };
-            }
-            else
-            {
-                // Silently ignore mode, uid, gid, atime, mtime changes
-                *reply = (SETATTR3res){ .status = NFS3_OK };
-            }
+            *reply = (SETATTR3res){ .status = NFS3ERR_ISDIR };
         }
         else
         {
@@ -366,6 +358,7 @@ static int nfs3_read_proc(void *opaque, rpc_op_t *rop)
 }
 
 static void nfs_resize_write(nfs_client_t *self, rpc_op_t *rop, uint64_t inode, uint64_t new_size, uint64_t offset, uint64_t count, void *buf);
+static void nfs_do_write(nfs_client_t *self, rpc_op_t *rop, uint64_t inode, uint64_t offset, uint64_t count, void *buf);
 
 static int nfs3_write_proc(void *opaque, rpc_op_t *rop)
 {
@@ -399,6 +392,7 @@ static int nfs3_write_proc(void *opaque, rpc_op_t *rop)
         .resok = (WRITE3resok){
             //.file_wcc = ...,
             .count = (unsigned)count,
+            .committed = args->stable,
         },
     };
     if ((args->offset % alignment) != 0 || (count % alignment) != 0)
@@ -442,101 +436,42 @@ static int nfs3_write_proc(void *opaque, rpc_op_t *rop)
     return 1;
 }
 
-static void complete_extend_write(nfs_client_t *self, rpc_op_t *rop, inode_t inode, int res)
+static void nfs_resize_write(nfs_client_t *self, rpc_op_t *rop, uint64_t inode, uint64_t new_size, uint64_t offset, uint64_t count, void *buf)
 {
-    WRITE3args *args = (WRITE3args*)rop->request;
-    WRITE3res *reply = (WRITE3res*)rop->reply;
-    if (res < 0)
-    {
-        *reply = (WRITE3res){ .status = vitastor_nfs_map_err(res) };
-        rpc_queue_reply(rop);
-        return;
-    }
-    bool imm = self->parent->cli->get_immediate_commit(inode);
-    reply->resok.committed = args->stable != UNSTABLE || imm ? FILE_SYNC : UNSTABLE;
-    *(uint64_t*)reply->resok.verf = self->parent->server_id;
-    if (args->stable != UNSTABLE && !imm)
-    {
-        // Client requested a stable write. Add an fsync
-        auto op = new cluster_op_t;
-        op->opcode = OSD_OP_SYNC;
-        op->callback = [rop](cluster_op_t *op)
-        {
-            if (op->retval != 0)
-            {
-                WRITE3res *reply = (WRITE3res*)rop->reply;
-                *reply = (WRITE3res){ .status = vitastor_nfs_map_err(-op->retval) };
-            }
-            delete op;
-            rpc_queue_reply(rop);
-        };
-        self->parent->cli->execute(op);
-    }
-    else
-    {
-        rpc_queue_reply(rop);
-    }
-}
-
-static void complete_extend_inode(nfs_client_t *self, uint64_t inode, uint64_t new_size, int err)
-{
-    auto ext_it = self->extend_writes.lower_bound((extend_size_t){ .inode = inode, .new_size = 0 });
-    while (ext_it != self->extend_writes.end() &&
-        ext_it->first.inode == inode &&
-        ext_it->first.new_size <= new_size)
-    {
-        ext_it->second.resize_res = err;
-        if (ext_it->second.write_res <= 0)
-        {
-            complete_extend_write(self, ext_it->second.rop, inode, ext_it->second.write_res < 0
-                ? ext_it->second.write_res : ext_it->second.resize_res);
-            self->extend_writes.erase(ext_it++);
-        }
-        else
-            ext_it++;
-    }
-}
-
-static void extend_inode(nfs_client_t *self, uint64_t inode, uint64_t new_size)
-{
-    // Send an extend request
-    auto & ext = self->extends[inode];
-    ext.cur_extend = new_size;
+    // Check if we have to resize the inode before writing
     auto inode_it = self->parent->cli->st_cli.inode_config.find(inode);
     if (inode_it != self->parent->cli->st_cli.inode_config.end() &&
         inode_it->second.size < new_size)
     {
         self->parent->cmd->loop_and_wait(self->parent->cmd->start_modify(json11::Json::object {
-            // FIXME: Resizing by ID is probably more correct
             { "image", inode_it->second.name },
             { "resize", new_size },
-            { "inc_size", true },
             { "force_size", true },
         }), [=](const cli_result_t & r)
         {
-            auto & ext = self->extends[inode];
             if (r.err)
             {
-                fprintf(stderr, "Error extending inode %lu to %lu bytes: %s\n", inode, new_size, r.text.c_str());
-            }
-            if (r.err == EAGAIN || ext.next_extend > ext.cur_extend)
-            {
-                // Multiple concurrent resize requests received, try to repeat
-                extend_inode(self, inode, ext.next_extend > ext.cur_extend ? ext.next_extend : ext.cur_extend);
+                if (r.err == EAGAIN)
+                {
+                    // Multiple concurrent resize requests received, try to repeat
+                    nfs_resize_write(self, rop, inode, new_size, offset, count, buf);
+                    return;
+                }
+                WRITE3res *reply = (WRITE3res*)rop->reply;
+                *reply = (WRITE3res){ .status = vitastor_nfs_map_err(r.err) };
+                rpc_queue_reply(rop);
                 return;
             }
-            ext.cur_extend = ext.next_extend = 0;
-            complete_extend_inode(self, inode, new_size, r.err);
+            nfs_do_write(self, rop, inode, offset, count, buf);
         });
     }
     else
     {
-        complete_extend_inode(self, inode, new_size, 0);
+        nfs_do_write(self, rop, inode, offset, count, buf);
     }
 }
 
-static void nfs_do_write(nfs_client_t *self, std::multimap<extend_size_t, extend_write_t>::iterator ewr_it,
-    rpc_op_t *rop, uint64_t inode, uint64_t offset, uint64_t count, void *buf)
+static void nfs_do_write(nfs_client_t *self, rpc_op_t *rop, uint64_t inode, uint64_t offset, uint64_t count, void *buf)
 {
     cluster_op_t *op = new cluster_op_t;
     op->opcode = OSD_OP_WRITE;
@@ -544,61 +479,48 @@ static void nfs_do_write(nfs_client_t *self, std::multimap<extend_size_t, extend
     op->offset = offset;
     op->len = count;
     op->iov.push_back(buf, count);
-    op->callback = [self, ewr_it, rop](cluster_op_t *op)
+    op->callback = [self, rop](cluster_op_t *op)
     {
-        auto inode = op->inode;
-        int write_res = op->retval < 0 ? op->retval : (op->retval != op->len ? -ERANGE : 0);
-        if (ewr_it == self->extend_writes.end())
+        uint64_t inode = op->inode;
+        WRITE3args *args = (WRITE3args*)rop->request;
+        WRITE3res *reply = (WRITE3res*)rop->reply;
+        if (op->retval != op->len)
         {
-            complete_extend_write(self, rop, inode, write_res);
+            *reply = (WRITE3res){ .status = vitastor_nfs_map_err(-op->retval) };
+            delete op;
+            rpc_queue_reply(rop);
         }
         else
         {
-            ewr_it->second.write_res = write_res;
-            if (ewr_it->second.resize_res <= 0)
+            *(uint64_t*)reply->resok.verf = self->parent->server_id;
+            delete op;
+            if (args->stable != UNSTABLE &&
+                !self->parent->cli->get_immediate_commit(inode))
             {
-                complete_extend_write(self, rop, inode, write_res < 0 ? write_res : ewr_it->second.resize_res);
-                self->extend_writes.erase(ewr_it);
+                // Client requested a stable write. Add an fsync
+                op = new cluster_op_t;
+                op->opcode = OSD_OP_SYNC;
+                op->callback = [rop](cluster_op_t *op)
+                {
+                    if (op->retval != 0)
+                    {
+                        WRITE3res *reply = (WRITE3res*)rop->reply;
+                        *reply = (WRITE3res){ .status = vitastor_nfs_map_err(-op->retval) };
+                    }
+                    delete op;
+                    rpc_queue_reply(rop);
+                };
+                self->parent->cli->execute(op);
+            }
+            else
+            {
+                rpc_queue_reply(rop);
             }
         }
     };
     self->parent->cli->execute(op);
 }
 
-static void nfs_resize_write(nfs_client_t *self, rpc_op_t *rop, uint64_t inode, uint64_t new_size, uint64_t offset, uint64_t count, void *buf)
-{
-    // Check if we have to resize the inode during write
-    auto inode_it = self->parent->cli->st_cli.inode_config.find(inode);
-    if (inode_it != self->parent->cli->st_cli.inode_config.end() &&
-        inode_it->second.size < new_size)
-    {
-        auto ewr_it = self->extend_writes.emplace((extend_size_t){
-            .inode = inode,
-            .new_size = new_size,
-        }, (extend_write_t){
-            .rop = rop,
-            .resize_res = 1,
-            .write_res = 1,
-        });
-        auto & ext = self->extends[inode];
-        if (ext.cur_extend > 0)
-        {
-            // Already resizing, just wait
-            if (ext.next_extend < new_size)
-                ext.next_extend = new_size;
-        }
-        else
-        {
-            extend_inode(self, inode, new_size);
-        }
-        nfs_do_write(self, ewr_it, rop, inode, offset, count, buf);
-    }
-    else
-    {
-        nfs_do_write(self, self->extend_writes.end(), rop, inode, offset, count, buf);
-    }
-}
-
 static int nfs3_create_proc(void *opaque, rpc_op_t *rop)
 {
     nfs_client_t *self = (nfs_client_t*)opaque;
@@ -959,27 +881,6 @@ static int nfs3_link_proc(void *opaque, rpc_op_t *rop)
     return 0;
 }
 
-static void fill_dir_entry(nfs_client_t *self, rpc_op_t *rop,
-    std::map<std::string, nfs_dir_t>::iterator dir_id_it, struct entryplus3 *entry, bool is_plus)
-{
-    if (dir_id_it == self->parent->dir_info.end())
-    {
-        return;
-    }
-    entry->fileid = dir_id_it->second.id;
-    if (is_plus)
-    {
-        entry->name_attributes = (post_op_attr){
-            .attributes_follow = 1,
-            .attributes = get_dir_attributes(self, dir_id_it->first),
-        };
-        entry->name_handle = (post_op_fh3){
-            .handle_follows = 1,
-            .handle = xdr_copy_string(rop->xdrs, "S"+base64_encode(sha256(dir_id_it->first))),
-        };
-    }
-}
-
 static void nfs3_readdir_common(void *opaque, rpc_op_t *rop, bool is_plus)
 {
     nfs_client_t *self = (nfs_client_t*)opaque;
@@ -1057,17 +958,17 @@ static void nfs3_readdir_common(void *opaque, rpc_op_t *rop, bool is_plus)
             continue;
         std::string subname = dir_id_it->first.substr(prefix.size());
         // for directories, fileid changes when the user restarts proxy
-        fill_dir_entry(self, rop, dir_id_it, &entries[subname], is_plus);
-    }
-    // Add . and ..
-    {
-        auto dir_id_it = self->parent->dir_info.find(dir);
-        fill_dir_entry(self, rop, dir_id_it, &entries["."], is_plus);
-        auto sl = dir.rfind("/");
-        if (sl != std::string::npos)
+        entries[subname].fileid = dir_id_it->second.id;
+        if (is_plus)
         {
-            auto dir_id_it = self->parent->dir_info.find(dir.substr(0, sl));
-            fill_dir_entry(self, rop, dir_id_it, &entries[".."], is_plus);
+            entries[subname].name_attributes = (post_op_attr){
+                .attributes_follow = 1,
+                .attributes = get_dir_attributes(self, dir_id_it->first),
+            };
+            entries[subname].name_handle = (post_op_fh3){
+                .handle_follows = 1,
+                .handle = xdr_copy_string(rop->xdrs, "S"+base64_encode(sha256(dir_id_it->first))),
+            };
         }
     }
     // Offset results by the continuation cookie (equal to index in the listing)
@@ -1292,11 +1193,10 @@ static int nfs3_commit_proc(void *opaque, rpc_op_t *rop)
     cluster_op_t *op = new cluster_op_t;
     // fsync. we don't know how to fsync a single inode, so just fsync everything
     op->opcode = OSD_OP_SYNC;
-    op->callback = [self, rop](cluster_op_t *op)
+    op->callback = [rop](cluster_op_t *op)
     {
         COMMIT3res *reply = (COMMIT3res*)rop->reply;
         *reply = (COMMIT3res){ .status = vitastor_nfs_map_err(op->retval) };
-        *(uint64_t*)reply->resok.verf = self->parent->server_id;
         rpc_queue_reply(rop);
     };
     self->parent->cli->execute(op);

src/nfs_proxy.h

@@ -86,28 +86,6 @@ struct rpc_free_buffer_t
     unsigned size;
 };
 
-struct extend_size_t
-{
-    inode_t inode;
-    uint64_t new_size;
-};
-
-inline bool operator < (const extend_size_t &a, const extend_size_t &b)
-{
-    return a.inode < b.inode || a.inode == b.inode && a.new_size < b.new_size;
-}
-
-struct extend_write_t
-{
-    rpc_op_t *rop;
-    int resize_res, write_res; // 1 = started, 0 = completed OK, -errno = completed with error
-};
-
-struct extend_inode_t
-{
-    uint64_t cur_extend = 0, next_extend = 0;
-};
-
 class nfs_client_t
 {
 public:
@@ -122,8 +100,6 @@ public:
     rpc_cur_buffer_t cur_buffer = { 0 };
     std::map<uint8_t*, rpc_used_buffer_t> used_buffers;
     std::vector<rpc_free_buffer_t> free_buffers;
-    std::map<inode_t, extend_inode_t> extends;
-    std::multimap<extend_size_t, extend_write_t> extend_writes;
 
     iovec read_iov;
     msghdr read_msg = { 0 };

src/qemu_driver.c

@@ -234,13 +234,15 @@ out:
     return;
 }
 
-#if defined VITASTOR_C_API_VERSION && VITASTOR_C_API_VERSION >= 2
 static void vitastor_uring_handler(void *opaque)
 {
     VitastorClient *client = (VitastorClient*)opaque;
     qemu_mutex_lock(&client->mutex);
     client->bh_uring_scheduled = 0;
-    vitastor_c_uring_handle_events(client->proxy);
+    do
+    {
+        vitastor_c_uring_handle_events(client->proxy);
+    } while (vitastor_c_uring_has_work(client->proxy));
     qemu_mutex_unlock(&client->mutex);
 }
 
@@ -264,23 +266,20 @@ static void vitastor_schedule_uring_handler(VitastorClient *client)
         replay_bh_schedule_oneshot_event(client->ctx, vitastor_uring_handler, opaque);
 #elif QEMU_VERSION_MAJOR >= 3 || QEMU_VERSION_MAJOR == 2 && QEMU_VERSION_MINOR >= 8
         aio_bh_schedule_oneshot(client->ctx, vitastor_uring_handler, opaque);
-#else
+#elif QEMU_VERSION_MAJOR >= 2
         VitastorBH *vbh = (VitastorBH*)malloc(sizeof(VitastorBH));
         vbh->cli = client;
-#if QEMU_VERSION_MAJOR >= 2
         vbh->bh = aio_bh_new(bdrv_get_aio_context(task->bs), vitastor_bh_uring_handler, vbh);
-#else
-        vbh->bh = qemu_bh_new(vitastor_bh_uring_handler, vbh);
-#endif
         qemu_bh_schedule(vbh->bh);
+#else
+        client->bh_uring_scheduled = 0;
+        do
+        {
+            vitastor_c_uring_handle_events(client->proxy);
+        } while (vitastor_c_uring_has_work(client->proxy));
 #endif
     }
 }
-#else
-static void vitastor_schedule_uring_handler(VitastorClient *client)
-{
-}
-#endif
 
 static void coroutine_fn vitastor_co_get_metadata(VitastorRPC *task)
 {
@@ -407,16 +406,20 @@ static int vitastor_file_open(BlockDriverState *bs, QDict *options, int flags, E
         vitastor_aio_set_fd_handler, client, client->config_path, client->etcd_host, client->etcd_prefix,
         client->use_rdma, client->rdma_device, client->rdma_port_num, client->rdma_gid_index, client->rdma_mtu, 0
     );
+#else
+    client->proxy = vitastor_c_create_uring(
+        client->config_path, client->etcd_host, client->etcd_prefix,
+        client->use_rdma, client->rdma_device, client->rdma_port_num, client->rdma_gid_index, client->rdma_mtu, 0
+    );
+#endif
     if (!client->proxy)
     {
         fprintf(stderr, "vitastor: failed to create io_uring: %s - I/O will be slower\n", strerror(errno));
         client->uring_eventfd = -1;
-#endif
         client->proxy = vitastor_c_create_qemu(
             vitastor_aio_set_fd_handler, client, client->config_path, client->etcd_host, client->etcd_prefix,
             client->use_rdma, client->rdma_device, client->rdma_port_num, client->rdma_gid_index, client->rdma_mtu, 0
         );
-#if defined VITASTOR_C_API_VERSION && VITASTOR_C_API_VERSION >= 2
     }
     else
     {
@@ -430,7 +433,6 @@ static int vitastor_file_open(BlockDriverState *bs, QDict *options, int flags, E
         }
         universal_aio_set_fd_handler(client->ctx, client->uring_eventfd, vitastor_uring_handler, NULL, client);
     }
-#endif
     image = client->image = g_strdup(qdict_get_try_str(options, "image"));
     client->readonly = (flags & BDRV_O_RDWR) ? 1 : 0;
     // Get image metadata (size and readonly flag) or just wait until the client is ready
@@ -662,8 +664,7 @@ static void vitastor_co_generic_cb(void *opaque, long retval)
     task->bh = aio_bh_new(bdrv_get_aio_context(task->bs), vitastor_co_generic_bh_cb, opaque);
     qemu_bh_schedule(task->bh);
 #else
-    task->bh = qemu_bh_new(vitastor_co_generic_bh_cb, opaque);
-    qemu_bh_schedule(task->bh);
+    vitastor_co_generic_bh_cb(opaque);
 #endif
 }
 
@@ -740,6 +741,7 @@ static void vitastor_co_read_bitmap_cb(void *opaque, long retval, uint8_t *bitma
     VitastorRPC *task = opaque;
     VitastorClient *client = task->bs->opaque;
     task->ret = retval;
+    task->complete = 1;
     if (retval >= 0)
     {
         task->bitmap = bitmap;
@@ -751,17 +753,15 @@ static void vitastor_co_read_bitmap_cb(void *opaque, long retval, uint8_t *bitma
             client->last_bitmap = bitmap;
         }
     }
-#if QEMU_VERSION_MAJOR > 4 || QEMU_VERSION_MAJOR == 4 && QEMU_VERSION_MINOR >= 2
-    replay_bh_schedule_oneshot_event(bdrv_get_aio_context(task->bs), vitastor_co_generic_bh_cb, opaque);
-#elif QEMU_VERSION_MAJOR >= 3 || QEMU_VERSION_MAJOR == 2 && QEMU_VERSION_MINOR >= 8
-    aio_bh_schedule_oneshot(bdrv_get_aio_context(task->bs), vitastor_co_generic_bh_cb, opaque);
-#elif QEMU_VERSION_MAJOR >= 2
-    task->bh = aio_bh_new(bdrv_get_aio_context(task->bs), vitastor_co_generic_bh_cb, opaque);
-    qemu_bh_schedule(task->bh);
+    if (qemu_coroutine_self() != task->co)
+    {
+#if QEMU_VERSION_MAJOR >= 3 || QEMU_VERSION_MAJOR == 2 && QEMU_VERSION_MINOR > 8
+        aio_co_wake(task->co);
 #else
-    task->bh = qemu_bh_new(vitastor_co_generic_bh_cb, opaque);
-    qemu_bh_schedule(task->bh);
+        qemu_coroutine_enter(task->co, NULL);
+        qemu_aio_release(task);
 #endif
+    }
 }
 
 static int coroutine_fn vitastor_co_block_status(

src/ringloop.cpp

@@ -66,16 +66,6 @@ void ring_loop_t::unregister_consumer(ring_consumer_t *consumer)
 
 void ring_loop_t::loop()
 {
-    if (ring_eventfd >= 0)
-    {
-        // Reset eventfd counter
-        uint64_t ctr = 0;
-        int r = read(ring_eventfd, &ctr, 8);
-        if (r < 0 && errno != EAGAIN && errno != EINTR)
-        {
-            fprintf(stderr, "Error resetting eventfd: %s\n", strerror(errno));
-        }
-    }
     struct io_uring_cqe *cqe;
     while (!io_uring_peek_cqe(&ring, &cqe))
     {
@@ -94,7 +84,7 @@ void ring_loop_t::loop()
         }
         else
         {
-            fprintf(stderr, "Warning: empty callback in SQE\n");
+            printf("Warning: empty callback in SQE\n");
             free_ring_data[free_ring_data_ptr++] = d - ring_datas;
         }
         io_uring_cqe_seen(&ring, cqe);

src/str_util.cpp

@@ -308,19 +308,3 @@ std::string str_repeat(const std::string & str, int times)
         r += str;
     return r;
 }
-
-size_t utf8_length(const std::string & s)
-{
-    size_t len = 0;
-    for (size_t i = 0; i < s.size(); i++)
-        len += (s[i] & 0xC0) != 0x80;
-    return len;
-}
-
-size_t utf8_length(const char *s)
-{
-    size_t len = 0;
-    for (; *s; s++)
-        len += (*s & 0xC0) != 0x80;
-    return len;
-}

src/str_util.h

@@ -18,5 +18,3 @@ void print_help(const char *help_text, std::string exe_name, std::string cmd, bo
 uint64_t parse_time(std::string time_str, bool *ok = NULL);
 std::string read_all_fd(int fd);
 std::string str_repeat(const std::string & str, int times);
-size_t utf8_length(const std::string & s);
-size_t utf8_length(const char *s);

src/vitastor.pc.in

@@ -6,7 +6,7 @@ includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@
 
 Name: Vitastor
 Description: Vitastor client library
-Version: 1.0.0
+Version: 0.9.3
 Libs: -L${libdir} -lvitastor_client
 Cflags: -I${includedir}
 

src/vitastor_c.cpp

@@ -215,7 +215,7 @@ void vitastor_c_uring_wait_events(vitastor_c *client)
     client->ringloop->wait();
 }
 
-int vitastor_c_uring_has_work(vitastor_c *client)
+bool vitastor_c_uring_has_work(vitastor_c *client)
 {
     return client->ringloop->has_work();
 }

src/vitastor_c.h

@@ -46,7 +46,7 @@ int vitastor_c_uring_register_eventfd(vitastor_c *client);
 void vitastor_c_uring_wait_ready(vitastor_c *client);
 void vitastor_c_uring_handle_events(vitastor_c *client);
 void vitastor_c_uring_wait_events(vitastor_c *client);
-int vitastor_c_uring_has_work(vitastor_c *client);
+bool vitastor_c_uring_has_work(vitastor_c *client);
 void vitastor_c_read(vitastor_c *client, uint64_t inode, uint64_t offset, uint64_t len,
     struct iovec *iov, int iovcnt, VitastorReadHandler cb, void *opaque);
 void vitastor_c_write(vitastor_c *client, uint64_t inode, uint64_t offset, uint64_t len, uint64_t check_version,

tests/run_3osds.sh

@@ -7,7 +7,6 @@ PG_COUNT=${PG_COUNT:-1}
 # OSD_COUNT
 SCHEME=${SCHEME:-replicated}
 # OSD_ARGS
-# OFFSET_ARGS
 # PG_SIZE
 # PG_MINSIZE
 
@@ -25,31 +24,17 @@ else
     $ETCDCTL put /vitastor/config/global '{"recovery_queue_depth":1,"osd_out_time":1}'
 fi
 
-start_osd_on()
+start_osd()
 {
     local i=$1
-    local dev=$2
     build/src/vitastor-osd --osd_num $i --bind_address 127.0.0.1 $NO_SAME $OSD_ARGS --etcd_address $ETCD_URL \
-        $(build/src/vitastor-disk simple-offsets --format options $OFFSET_ARGS $dev $OFFSET_ARGS 2>/dev/null) \
+        $(build/src/vitastor-disk simple-offsets --format options ./testdata/test_osd$i.bin $OFFSET_ARGS 2>/dev/null) \
         >>./testdata/osd$i.log 2>&1 &
     eval OSD${i}_PID=$!
 }
 
-if ! type -t osd_dev; then
-    osd_dev()
-    {
-        local i=$1
-        [[ -f ./testdata/test_osd$i.bin ]] || dd if=/dev/zero of=./testdata/test_osd$i.bin bs=1024 count=1 seek=$((OSD_SIZE*1024-1))
-        echo ./testdata/test_osd$i.bin
-    }
-fi
-
-start_osd()
-{
-    start_osd_on $1 $(osd_dev $1)
-}
-
 for i in $(seq 1 $OSD_COUNT); do
+    dd if=/dev/zero of=./testdata/test_osd$i.bin bs=1024 count=1 seek=$((OSD_SIZE*1024-1))
     start_osd $i
 done
 
@@ -100,7 +85,7 @@ wait_up()
 }
 
 if [[ $OSD_COUNT -gt 0 ]]; then
-    wait_up 120
+    wait_up 60
 fi
 
 try_reweight()

tests/test_add_osd.sh

@@ -8,7 +8,10 @@ LD_PRELOAD="build/src/libfio_vitastor.so" \
     fio -thread -name=test -ioengine=build/src/libfio_vitastor.so -bs=4M -direct=1 -iodepth=1 -end_fsync=1 \
         -rw=write -etcd=$ETCD_URL -pool=1 -inode=1 -size=128M -cluster_log_level=10
 
-start_osd 4
+for i in 4; do
+    dd if=/dev/zero of=./testdata/test_osd$i.bin bs=1024 count=1 seek=$((OSD_SIZE*1024-1))
+    start_osd $i
+done
 
 sleep 2