WIP Support "prefetch" in kv_db

2025-05-03 15:06:59 +03:00
284 changed files with 7637 additions and 31223 deletions
@@ -20,7 +20,7 @@ RUN echo 'deb http://deb.debian.org/debian bullseye-backports main' >> /etc/apt/

 RUN apt-get update
 RUN apt-get -y install etcd qemu-system-x86 qemu-block-extra qemu-utils fio libasan5 \
-    libgoogle-perftools-dev devscripts libjerasure-dev cmake libibverbs-dev libisal-dev
+    liburing1 liburing-dev libgoogle-perftools-dev devscripts libjerasure-dev cmake libibverbs-dev libisal-dev
 RUN apt-get -y build-dep fio qemu=`dpkg -s qemu-system-x86|grep ^Version:|awk '{print $2}'`
 RUN apt-get update && apt-get -y install jq lp-solve sudo nfs-common fdisk parted
 RUN apt-get --download-only source fio qemu=`dpkg -s qemu-system-x86|grep ^Version:|awk '{print $2}'`
@@ -144,24 +144,6 @@ jobs:
          echo ""
        done

-  test_change_pg_count_online:
-    runs-on: ubuntu-latest
-    needs: build
-    container: ${{env.TEST_IMAGE}}:${{github.sha}}
-    steps:
-    - name: Run test
-      id: test
-      timeout-minutes: 3
-      run: /root/vitastor/tests/test_change_pg_count_online.sh
-    - name: Print logs
-      if: always() && steps.test.outcome == 'failure'
-      run: |
-        for i in /root/vitastor/testdata/*.log /root/vitastor/testdata/*.txt; do
-          echo "-------- $i --------"
-          cat $i
-          echo ""
-        done
-
  test_change_pg_size:
    runs-on: ubuntu-latest
    needs: build
@@ -414,24 +396,6 @@ jobs:
          echo ""
        done

-  test_degraded:
-    runs-on: ubuntu-latest
-    needs: build
-    container: ${{env.TEST_IMAGE}}:${{github.sha}}
-    steps:
-    - name: Run test
-      id: test
-      timeout-minutes: 3
-      run: /root/vitastor/tests/test_degraded.sh
-    - name: Print logs
-      if: always() && steps.test.outcome == 'failure'
-      run: |
-        for i in /root/vitastor/testdata/*.log /root/vitastor/testdata/*.txt; do
-          echo "-------- $i --------"
-          cat $i
-          echo ""
-        done
-
  test_rm:
    runs-on: ubuntu-latest
    needs: build
@@ -720,24 +684,6 @@ jobs:
          echo ""
        done

-  test_write_iothreads:
-    runs-on: ubuntu-latest
-    needs: build
-    container: ${{env.TEST_IMAGE}}:${{github.sha}}
-    steps:
-    - name: Run test
-      id: test
-      timeout-minutes: 3
-      run: TEST_NAME=iothreads GLOBAL_CONFIG=',"client_iothread_count":4' /root/vitastor/tests/test_write.sh
-    - name: Print logs
-      if: always() && steps.test.outcome == 'failure'
-      run: |
-        for i in /root/vitastor/testdata/*.log /root/vitastor/testdata/*.txt; do
-          echo "-------- $i --------"
-          cat $i
-          echo ""
-        done
-
  test_write_no_same:
    runs-on: ubuntu-latest
    needs: build
@@ -774,24 +720,6 @@ jobs:
          echo ""
        done

-  test_heal_local_read:
-    runs-on: ubuntu-latest
-    needs: build
-    container: ${{env.TEST_IMAGE}}:${{github.sha}}
-    steps:
-    - name: Run test
-      id: test
-      timeout-minutes: 10
-      run: TEST_NAME=local_read POOLCFG='"local_reads":"random",' /root/vitastor/tests/test_heal.sh
-    - name: Print logs
-      if: always() && steps.test.outcome == 'failure'
-      run: |
-        for i in /root/vitastor/testdata/*.log /root/vitastor/testdata/*.txt; do
-          echo "-------- $i --------"
-          cat $i
-          echo ""
-        done
-
  test_heal_ec:
    runs-on: ubuntu-latest
    needs: build
@@ -828,60 +756,6 @@ jobs:
          echo ""
        done

-  test_reweight_half:
-    runs-on: ubuntu-latest
-    needs: build
-    container: ${{env.TEST_IMAGE}}:${{github.sha}}
-    steps:
-    - name: Run test
-      id: test
-      timeout-minutes: 3
-      run: /root/vitastor/tests/test_reweight_half.sh
-    - name: Print logs
-      if: always() && steps.test.outcome == 'failure'
-      run: |
-        for i in /root/vitastor/testdata/*.log /root/vitastor/testdata/*.txt; do
-          echo "-------- $i --------"
-          cat $i
-          echo ""
-        done
-
-  test_snapshot_pool2:
-    runs-on: ubuntu-latest
-    needs: build
-    container: ${{env.TEST_IMAGE}}:${{github.sha}}
-    steps:
-    - name: Run test
-      id: test
-      timeout-minutes: 3
-      run: /root/vitastor/tests/test_snapshot_pool2.sh
-    - name: Print logs
-      if: always() && steps.test.outcome == 'failure'
-      run: |
-        for i in /root/vitastor/testdata/*.log /root/vitastor/testdata/*.txt; do
-          echo "-------- $i --------"
-          cat $i
-          echo ""
-        done
-
-  test_snapshot_read_bitmap:
-    runs-on: ubuntu-latest
-    needs: build
-    container: ${{env.TEST_IMAGE}}:${{github.sha}}
-    steps:
-    - name: Run test
-      id: test
-      timeout-minutes: 3
-      run: /root/vitastor/tests/test_snapshot_read_bitmap.sh
-    - name: Print logs
-      if: always() && steps.test.outcome == 'failure'
-      run: |
-        for i in /root/vitastor/testdata/*.log /root/vitastor/testdata/*.txt; do
-          echo "-------- $i --------"
-          cat $i
-          echo ""
-        done
-
  test_heal_csum_32k_dmj:
    runs-on: ubuntu-latest
    needs: build
@@ -1026,6 +900,24 @@ jobs:
          echo ""
        done

+  test_snapshot_pool2:
+    runs-on: ubuntu-latest
+    needs: build
+    container: ${{env.TEST_IMAGE}}:${{github.sha}}
+    steps:
+    - name: Run test
+      id: test
+      timeout-minutes: 3
+      run: /root/vitastor/tests/test_snapshot_pool2.sh
+    - name: Print logs
+      if: always() && steps.test.outcome == 'failure'
+      run: |
+        for i in /root/vitastor/testdata/*.log /root/vitastor/testdata/*.txt; do
+          echo "-------- $i --------"
+          cat $i
+          echo ""
+        done
+
  test_osd_tags:
    runs-on: ubuntu-latest
    needs: build
@@ -2,19 +2,6 @@ cmake_minimum_required(VERSION 2.8.12)

 project(vitastor)

-set(VITASTOR_VERSION "2.4.3")
+set(VITASTOR_VERSION "2.1.0")

-include(CTest)
-
-add_custom_target(build_tests)
-add_custom_target(test
-	COMMAND
-	echo leak:tcmalloc > ${CMAKE_CURRENT_BINARY_DIR}/lsan-suppress.txt &&
-	env LSAN_OPTIONS=suppressions=${CMAKE_CURRENT_BINARY_DIR}/lsan-suppress.txt ${CMAKE_CTEST_COMMAND}
-)
-# make -j16 -C ../../build test_heap && ../../build/src/test/test_heap
-# make -j16 -C ../../build test_heap && rm -f $(find ../../build -name '*.gcda') && ctest -V -T test -T coverage -R heap --test-dir ../../build && (cd ../../build; gcovr -f ../src --html --html-nested -o coverage/index.html; cd ../src/test)
-# make -j16 -C ../../build test_blockstore && rm -f $(find ../../build -name '*.gcda') && ctest -V -T test -T coverage -R blockstore --test-dir ../../build && (cd ../../build; gcovr -f ../src --html --html-nested -o coverage/index.html; cd ../src/test)
-# kcov --include-path=../../../src ../../kcov ./test_blockstore
-add_dependencies(test build_tests)
 add_subdirectory(src)
@@ -19,7 +19,7 @@ Vitastor нацелен в первую очередь на SSD и SSD+HDD кл
 TCP и RDMA и на хорошем железе может достигать задержки 4 КБ чтения и записи на уровне ~0.1 мс,
 что примерно в 10 раз быстрее, чем Ceph и другие популярные программные СХД.

-Vitastor поддерживает QEMU-драйвер, протоколы UBLK, NBD и NFS, драйверы OpenStack, OpenNebula, Proxmox, Kubernetes.
+Vitastor поддерживает QEMU-драйвер, протоколы NBD и NFS, драйверы OpenStack, OpenNebula, Proxmox, Kubernetes.
 Другие драйверы могут также быть легко реализованы.

 Подробности смотрите в документации по ссылкам. Можете начать отсюда: [Быстрый старт](docs/intro/quickstart.ru.md).
@@ -64,9 +64,8 @@ Vitastor поддерживает QEMU-драйвер, протоколы UBLK,
  - [vitastor-cli](docs/usage/cli.ru.md) (консольный интерфейс)
  - [vitastor-disk](docs/usage/disk.ru.md) (управление дисками)
  - [fio](docs/usage/fio.ru.md) для тестов производительности
-  - [UBLK](docs/usage/ublk.ru.md) для монтирования ядром
-  - [NBD](docs/usage/nbd.ru.md) - старый интерфейс для монтирования ядром
-  - [QEMU, qemu-img и VDUSE](docs/usage/qemu.ru.md)
+  - [NBD](docs/usage/nbd.ru.md) для монтирования ядром
+  - [QEMU и qemu-img](docs/usage/qemu.ru.md)
  - [NFS](docs/usage/nfs.ru.md) кластерная файловая система и псевдо-ФС прокси
  - [Администрирование](docs/usage/admin.ru.md)
 - Производительность
@@ -19,7 +19,7 @@ supports TCP and RDMA and may achieve 4 KB read and write latency as low as ~0.1
 with proper hardware which is ~10 times faster than other popular SDS's like Ceph
 or internal systems of public clouds.

-Vitastor supports QEMU, UBLK, NBD, NFS protocols, OpenStack, OpenNebula, Proxmox, Kubernetes drivers.
+Vitastor supports QEMU, NBD, NFS protocols, OpenStack, OpenNebula, Proxmox, Kubernetes drivers.
 More drivers may be created easily.

 Read more details in the documentation. You can start from here: [Quick Start](docs/intro/quickstart.en.md).
@@ -64,9 +64,8 @@ Read more details in the documentation. You can start from here: [Quick Start](d
  - [vitastor-cli](docs/usage/cli.en.md) (command-line interface)
  - [vitastor-disk](docs/usage/disk.en.md) (disk management tool)
  - [fio](docs/usage/fio.en.md) for benchmarks
-  - [UBLK](docs/usage/ublk.en.md) for kernel mounts
-  - [NBD](docs/usage/nbd.en.md) - old interface for kernel mounts
-  - [QEMU, qemu-img and VDUSE](docs/usage/qemu.en.md)
+  - [NBD](docs/usage/nbd.en.md) for kernel mounts
+  - [QEMU and qemu-img](docs/usage/qemu.en.md)
  - [NFS](docs/usage/nfs.en.md) clustered file system and pseudo-FS proxy
  - [Administration](docs/usage/admin.en.md)
 - Performance
@@ -36,7 +36,7 @@ RUN (echo deb http://vitastor.io/debian bookworm main > /etc/apt/sources.list.d/
    ((echo 'Package: *'; echo 'Pin: origin "vitastor.io"'; echo 'Pin-Priority: 1000') > /etc/apt/preferences.d/vitastor.pref) && \
    wget -q -O /etc/apt/trusted.gpg.d/vitastor.gpg https://vitastor.io/debian/pubkey.gpg && \
    apt-get update && \
-    apt-get install -y vitastor-client ibverbs-providers && \
+    apt-get install -y vitastor-client && \
    wget https://vitastor.io/archive/qemu/qemu-bookworm-9.2.2%2Bds-1%2Bvitastor4/qemu-utils_9.2.2%2Bds-1%2Bvitastor4_amd64.deb && \
    wget https://vitastor.io/archive/qemu/qemu-bookworm-9.2.2%2Bds-1%2Bvitastor4/qemu-block-extra_9.2.2%2Bds-1%2Bvitastor4_amd64.deb && \
    dpkg -x qemu-utils*.deb tmp1 && \
@@ -1,49 +0,0 @@
-# Compile stage
-FROM golang:bookworm AS build
-
-ADD go.sum go.mod /app/
-RUN cd /app; CGO_ENABLED=1 GOOS=linux GOARCH=amd64 go mod download -x
-ADD . /app
-RUN perl -i -e '$/ = undef; while(<>) { s/\n\s*(\{\s*\n)/$1\n/g; s/\}(\s*\n\s*)else\b/$1} else/g; print; }' `find /app -name '*.go'` && \
-    cd /app && \
-    CGO_ENABLED=1 GOOS=linux GOARCH=amd64 go build -o vitastor-csi
-
-# Final stage
-FROM debian:bookworm
-
-LABEL maintainers="Vitaliy Filippov <vitalif@yourcmc.ru>"
-LABEL description="Vitastor CSI Driver"
-
-ENV NODE_ID=""
-ENV CSI_ENDPOINT=""
-
-RUN apt-get update && \
-    apt-get install -y wget && \
-    (echo "APT::Install-Recommends false;" > /etc/apt/apt.conf) && \
-    apt-get update && \
-    apt-get install -y e2fsprogs xfsprogs kmod iproute2 \
-        # NFS mount dependencies
-        nfs-common netbase \
-        # dependencies of qemu-storage-daemon
-        libnuma1 liburing2 libglib2.0-0 libfuse3-3 libaio1 libzstd1 libnettle8 \
-        libgmp10 libhogweed6 libp11-kit0 libidn2-0 libunistring2 libtasn1-6 libpcre2-8-0 libffi8 && \
-    apt-get clean && \
-    (echo options nbd nbds_max=128 > /etc/modprobe.d/nbd.conf)
-
-COPY --from=build /app/vitastor-csi /bin/
-
-ADD deb /deb
-
-RUN apt-get update && \
-    apt-get -y install /deb/vitastor-client_*.deb && \
-    wget https://vitastor.io/archive/qemu/qemu-bookworm-9.2.2%2Bds-1%2Bvitastor4/qemu-utils_9.2.2%2Bds-1%2Bvitastor4_amd64.deb && \
-    wget https://vitastor.io/archive/qemu/qemu-bookworm-9.2.2%2Bds-1%2Bvitastor4/qemu-block-extra_9.2.2%2Bds-1%2Bvitastor4_amd64.deb && \
-    dpkg -x qemu-utils*.deb tmp1 && \
-    dpkg -x qemu-block-extra*.deb tmp1 && \
-    cp -a tmp1/usr/bin/qemu-storage-daemon /usr/bin/ && \
-    mkdir -p /usr/lib/x86_64-linux-gnu/qemu && \
-    cp -a tmp1/usr/lib/x86_64-linux-gnu/qemu/block-vitastor.so /usr/lib/x86_64-linux-gnu/qemu/ && \
-    rm -rf tmp1 *.deb && \
-    apt-get clean
-
-ENTRYPOINT ["/bin/vitastor-csi"]
@@ -1,4 +1,4 @@
-VITASTOR_VERSION ?= v2.4.3
+VITASTOR_VERSION ?= v2.1.0

 all: build push

@@ -49,7 +49,7 @@ spec:
            capabilities:
              add: ["SYS_ADMIN"]
            allowPrivilegeEscalation: true
-          image: vitalif/vitastor-csi:v2.4.3
+          image: vitalif/vitastor-csi:v2.1.0
          args:
            - "--node=$(NODE_ID)"
            - "--endpoint=$(CSI_ENDPOINT)"
@@ -121,7 +121,7 @@ spec:
            privileged: true
            capabilities:
              add: ["SYS_ADMIN"]
-          image: vitalif/vitastor-csi:v2.4.3
+          image: vitalif/vitastor-csi:v2.1.0
          args:
            - "--node=$(NODE_ID)"
            - "--endpoint=$(CSI_ENDPOINT)"
@@ -5,7 +5,7 @@ package vitastor

 const (
    vitastorCSIDriverName    = "csi.vitastor.io"
-    vitastorCSIDriverVersion = "2.4.3"
+    vitastorCSIDriverVersion = "2.1.0"
 )

 // Config struct fills the parameters of request or user input
@@ -33,7 +33,7 @@ import (
 type NodeServer struct
 {
    *Driver
-    method          MountMethod
+    useVduse        bool
    stateDir        string
    nfsStageDir     string
    mounter         mount.Interface
@@ -81,23 +81,16 @@ func NewNodeServer(driver *Driver) *NodeServer
    }
    ns := &NodeServer{
        Driver:      driver,
-        method:      selectMountMethod(),
+        useVduse:    checkVduseSupport(),
        stateDir:    stateDir,
        nfsStageDir: nfsStageDir,
        mounter:     mount.New(""),
        volumeLocks: make(map[string]bool),
    }
    ns.cond = sync.NewCond(&ns.mu)
-    if (ns.method == MOUNT_VDUSE)
+    if (ns.useVduse)
    {
        ns.restoreVduseDaemons()
-    }
-    else if (ns.method == MOUNT_UBLK)
-    {
-        ns.restoreUblkDaemons()
-    }
-    if (ns.method == MOUNT_VDUSE || ns.method == MOUNT_UBLK)
-    {
        dur, err := time.ParseDuration(os.Getenv("RESTART_INTERVAL"))
        if (err != nil)
        {
@@ -143,14 +136,7 @@ func (ns *NodeServer) restarter()
    for
    {
        <-ticker.C
-        if (ns.method == MOUNT_VDUSE)
-        {
-            ns.restoreVduseDaemons()
-        }
-        else if (ns.method == MOUNT_UBLK)
-        {
-            ns.restoreUblkDaemons()
-        }
+        ns.restoreVduseDaemons()
    }
 }

@@ -245,78 +231,6 @@ func (ns *NodeServer) checkVduseState(stateFile string, devs map[string]interfac
    }
 }

-func (ns *NodeServer) restoreUblkDaemons()
-{
-    pattern := ns.stateDir+"vitastor-ublk-*.json"
-    stateFiles, err := filepath.Glob(pattern)
-    if (err != nil)
-    {
-        klog.Errorf("failed to list %s: %v", pattern, err)
-    }
-    if (len(stateFiles) == 0)
-    {
-        return
-    }
-    for _, stateFile := range stateFiles
-    {
-        deviceNum := stateFile[len(ns.stateDir) + len("vitastor-ublk-") :]
-        deviceNum = deviceNum[0:len(deviceNum)-5]
-        ns.checkUblkState(deviceNum)
-    }
-}
-
-func (ns *NodeServer) checkUblkState(deviceNum string)
-{
-    // Check if the ublk daemon is still active
-
-    // Read state file
-    stateFile := ns.stateDir + "vitastor-ublk-" + deviceNum + ".json"
-    stateJSON, err := os.ReadFile(stateFile)
-    if (err != nil)
-    {
-        klog.Warningf("error reading state file %v: %v", stateFile, err)
-        return
-    }
-    var state DeviceState
-    err = json.Unmarshal(stateJSON, &state)
-    if (err != nil)
-    {
-        klog.Warningf("state file %v contains invalid JSON (error %v): %v", stateFile, err, string(stateJSON))
-        return
-    }
-
-    // Lock volume
-    ns.lockVolume(state.ConfigPath+":block:"+state.Image)
-    defer ns.unlockVolume(state.ConfigPath+":block:"+state.Image)
-
-    // Recheck state file after locking
-    _, err = os.ReadFile(stateFile)
-    if (err != nil)
-    {
-        klog.Warningf("state file %v disappeared, skipping volume", stateFile)
-        return
-    }
-
-    // Check if the vitastor-ublk process is still active
-    pidFile := ns.stateDir + "vitastor-ublk-" + deviceNum + ".pid"
-    exists := false
-    proc, err := findByPidFile(pidFile)
-    if (err == nil)
-    {
-        exists = proc.Signal(syscall.Signal(0)) == nil
-    }
-    if (!exists)
-    {
-        // Restart daemon
-        klog.Warningf("recovering UBLK device /dev/ublkb%v for volume %v", deviceNum, state.Image)
-        _, err = mapUblk(ns.stateDir, state.Image, state.ConfigPath, state.Readonly, "/dev/ublkb"+deviceNum)
-        if (err != nil)
-        {
-            klog.Warningf("failed to recover ublk device for volume %v: %v", state.Image, err)
-        }
-    }
-}
-
 func (ns *NodeServer) restoreNfsDaemons()
 {
    pattern := ns.stateDir+"vitastor-nfs-*.json"
@@ -503,18 +417,14 @@ func (ns *NodeServer) NodeStageVolume(ctx context.Context, req *csi.NodeStageVol
    }

    var devicePath, vdpaId string
-    if (ns.method == MOUNT_UBLK)
-    {
-        devicePath, err = mapUblk(ns.stateDir, volName, ctxVars["configPath"], false, "")
-    }
-    else if (ns.method == MOUNT_VDUSE)
-    {
-        devicePath, vdpaId, err = mapVduse(ns.stateDir, volName, ctxVars, false)
-    }
-    else /* if (ns.method == MOUNT_NBD) */
+    if (!ns.useVduse)
    {
        devicePath, err = mapNbd(volName, ctxVars, false)
    }
+    else
+    {
+        devicePath, vdpaId, err = mapVduse(ns.stateDir, volName, ctxVars, false)
+    }
    if (err != nil)
    {
        return nil, err
@@ -529,8 +439,7 @@ func (ns *NodeServer) NodeStageVolume(ctx context.Context, req *csi.NodeStageVol
    else
    {
        // Check existing format
-        var existingFormat string
-        existingFormat, err = diskMounter.GetDiskFormat(devicePath)
+        existingFormat, err := diskMounter.GetDiskFormat(devicePath)
        if (err != nil)
        {
            klog.Errorf("failed to get disk format for path %s, error: %v", err)
@@ -586,6 +495,10 @@ func (ns *NodeServer) NodeStageVolume(ctx context.Context, req *csi.NodeStageVol
                case "xfs":
                    _, err = systemCombined("xfs_growfs", devicePath)
            }
+            if (err != nil)
+            {
+                goto unmap
+            }
        }
    }
    if (err != nil)
@@ -599,18 +512,14 @@ func (ns *NodeServer) NodeStageVolume(ctx context.Context, req *csi.NodeStageVol
    return &csi.NodeStageVolumeResponse{}, nil

 unmap:
-    if (ns.method == MOUNT_UBLK)
-    {
-        unmapUblk(ns.stateDir, devicePath)
-    }
-    else if (ns.method == MOUNT_VDUSE)
-    {
-        unmapVduseById(ns.stateDir, vdpaId)
-    }
-    else /* if (ns.method == MOUNT_NBD) */
+    if (!ns.useVduse || len(devicePath) >= 8 && devicePath[0:8] == "/dev/nbd")
    {
        unmapNbd(devicePath)
    }
+    else
+    {
+        unmapVduseById(ns.stateDir, vdpaId)
+    }
    return nil, err
 }

@@ -636,7 +545,7 @@ func (ns *NodeServer) NodeUnstageVolume(ctx context.Context, req *csi.NodeUnstag
    defer ns.unlockVolume(ctxVars["configPath"]+":block:"+volName)

    targetPath := req.GetStagingTargetPath()
-    devicePath, err := GetDeviceNameFromMount(targetPath)
+    devicePath, _, err := mount.GetDeviceNameFromMount(ns.mounter, targetPath)
    if (err != nil)
    {
        if (os.IsNotExist(err))
@@ -673,18 +582,14 @@ func (ns *NodeServer) NodeUnstageVolume(ctx context.Context, req *csi.NodeUnstag
    // unmap device
    if (len(refList) == 0)
    {
-        if (ns.method == MOUNT_UBLK)
-        {
-            unmapUblk(ns.stateDir, devicePath)
-        }
-        else if (ns.method == MOUNT_VDUSE)
-        {
-            unmapVduse(ns.stateDir, devicePath)
-        }
-        else /* if (ns.method == MOUNT_NBD) */
+        if (!ns.useVduse)
        {
            unmapNbd(devicePath)
        }
+        else
+        {
+            unmapVduse(ns.stateDir, devicePath)
+        }
    }

    return &csi.NodeUnstageVolumeResponse{}, nil
@@ -992,7 +897,7 @@ func (ns *NodeServer) NodeUnpublishVolume(ctx context.Context, req *csi.NodeUnpu
    }

    targetPath := req.GetTargetPath()
-    devicePath, err := GetDeviceNameFromMount(targetPath)
+    devicePath, _, err := mount.GetDeviceNameFromMount(ns.mounter, targetPath)
    if (err != nil)
    {
        if (os.IsNotExist(err))
@@ -16,20 +16,10 @@ import (
    "syscall"

    "k8s.io/klog"
-    "k8s.io/utils/mount"
-
    "google.golang.org/grpc/codes"
    "google.golang.org/grpc/status"
 )

-type MountMethod int
-
-const (
-    MOUNT_NBD   MountMethod = 0
-    MOUNT_VDUSE MountMethod = 1
-    MOUNT_UBLK  MountMethod = 2
-)
-
 func Contains(list []string, s string) bool
 {
    for i := 0; i < len(list); i++
@@ -42,26 +32,29 @@ func Contains(list []string, s string) bool
    return false
 }

-func selectMountMethod() MountMethod
+func checkVduseSupport() bool
 {
-    // Check UBLK support (ublk_drv kernel module)
-    if (checkModule("ublk_drv"))
-    {
-        klog.Infof("UBLK support enabled successfully")
-        return MOUNT_UBLK
-    }
-    klog.Errorf(
-        "Your host apparently has no UBLK support. UBLK support disabled."+
-        " For UBLK you need at least Linux 6.0 and the ublk_drv kernel module.",
-    )
    // Check VDUSE support (vdpa, vduse, virtio-vdpa kernel modules)
    vduse := true
    for _, mod := range []string{"vdpa", "vduse", "virtio-vdpa"}
    {
-        if (!checkModule(mod))
+        _, err := os.Stat("/sys/module/"+mod)
+        if (err != nil)
        {
-            vduse = false
-            break
+            if (!errors.Is(err, os.ErrNotExist))
+            {
+                klog.Errorf("failed to check /sys/module/%s: %v", mod, err)
+            }
+            c := exec.Command("/sbin/modprobe", mod)
+            c.Stdout = os.Stderr
+            c.Stderr = os.Stderr
+            err := c.Run()
+            if (err != nil)
+            {
+                klog.Errorf("/sbin/modprobe %s failed: %v", mod, err)
+                vduse = false
+                break
+            }
        }
    }
    // Check that vdpa tool functions
@@ -76,38 +69,18 @@ func selectMountMethod() MountMethod
            vduse = false
        }
    }
-    if (vduse)
+    if (!vduse)
+    {
+        klog.Errorf(
+            "Your host apparently has no VDUSE support. VDUSE support disabled, NBD will be used to map devices."+
+            " For VDUSE you need at least Linux 5.15 and the following kernel modules: vdpa, virtio-vdpa, vduse.",
+        )
+    }
+    else
    {
        klog.Infof("VDUSE support enabled successfully")
-        return MOUNT_VDUSE
    }
-    klog.Errorf(
-        "Your host apparently has no VDUSE support. VDUSE support disabled, NBD will be used to map devices."+
-        " For VDUSE you need at least Linux 5.15 and the following kernel modules: vdpa, virtio-vdpa, vduse.",
-    )
-    return MOUNT_NBD
-}
-
-func checkModule(mod string) bool
-{
-    _, err := os.Stat("/sys/module/"+mod)
-    if (err != nil)
-    {
-        if (!errors.Is(err, os.ErrNotExist))
-        {
-            klog.Errorf("failed to check /sys/module/%s: %v", mod, err)
-        }
-        c := exec.Command("/sbin/modprobe", mod)
-        c.Stdout = os.Stderr
-        c.Stderr = os.Stderr
-        err := c.Run()
-        if (err != nil)
-        {
-            klog.Errorf("/sbin/modprobe %s failed: %v", mod, err)
-            return false
-        }
-    }
-    return true
+    return vduse
 }

 func mapNbd(volName string, ctxVars map[string]string, readonly bool) (string, error)
@@ -244,7 +217,6 @@ func mapVduse(stateDir string, volName string, ctxVars map[string]string, readon
                    stateJSON, _ := json.Marshal(&DeviceState{
                        ConfigPath: ctxVars["configPath"],
                        VdpaId:     vdpaId,
-
                        Image:      volName,
                        Blockdev:   blockdev,
                        Readonly:   readonly,
@@ -337,117 +309,6 @@ func unmapVduseById(stateDir, vdpaId string)
    }
 }

-func mapUblk(stateDir string, volName string, configPath string, readonly bool, recoverDev string) (string, error)
-{
-    pidFile := ""
-    if (recoverDev != "")
-    {
-        if (len(recoverDev) < 10 || recoverDev[0:10] != "/dev/ublkb")
-        {
-            return "", fmt.Errorf("recover: %s does not start with /dev/ublkb", recoverDev)
-        }
-        pidFile = stateDir + "vitastor-ublk-" + recoverDev[10:] + ".pid"
-    }
-    else
-    {
-        pidFd, err := os.CreateTemp(stateDir, "vitastor-tmp-*.pid")
-        if (err != nil)
-        {
-            return "", err
-        }
-        pidFile = pidFd.Name()
-        pidFd.Close()
-    }
-    // Map device via vitastor-ublk
-    args := []string{
-        "map", "--image", volName, "--pidfile", pidFile,
-    }
-    if (configPath != "")
-    {
-        args = append(args, "--config_path", configPath)
-    }
-    if (readonly)
-    {
-        args = append(args, "--readonly")
-    }
-    if (recoverDev != "")
-    {
-        args = append(args, "--recover", recoverDev)
-    }
-    stdout, stderr, err := system("/usr/bin/vitastor-ublk", args...)
-    if (err != nil)
-    {
-        return "", err
-    }
-    devicePath := strings.TrimSpace(string(stdout))
-    if (devicePath == "")
-    {
-        return "", fmt.Errorf("vitastor-ublk did not return the name of the device. output: %s", stderr)
-    }
-    if (len(devicePath) >= 10 && devicePath[0:10] == "/dev/ublkb")
-    {
-        // Generate state file
-        devNum := devicePath[10:]
-        pidNew := stateDir + "vitastor-ublk-" + devNum + ".pid"
-        if (pidFile != pidNew)
-        {
-            err := os.Rename(pidFile, pidNew)
-            if (err != nil)
-            {
-                klog.Errorf("Failed to rename PID file %s to %s: %v", pidFile, pidNew, err)
-            }
-            else
-            {
-                pidFile = pidNew
-            }
-        }
-        stateFile := stateDir + "vitastor-ublk-" + devNum + ".json"
-        stateJSON, _ := json.Marshal(&DeviceState{
-            ConfigPath: configPath,
-            Image:      volName,
-            Readonly:   readonly,
-            PidFile:    pidFile,
-        })
-        err = os.WriteFile(stateFile, stateJSON, 0600)
-        if (err == nil)
-        {
-            klog.Infof("Attached volume %s via UBLK as %s", volName, devicePath)
-            return devicePath, nil
-        }
-        os.Remove(stateFile)
-    }
-    killErr := killByPidFile(pidFile)
-    if (killErr != nil)
-    {
-        klog.Errorf("Failed to kill started vitastor-ublk: %v", killErr)
-    }
-    os.Remove(pidFile)
-    return "", err
-}
-
-func unmapUblk(stateDir, devicePath string)
-{
-    if (len(devicePath) < 10 || devicePath[0:10] != "/dev/ublkb")
-    {
-        klog.Errorf("%s does not start with /dev/ublkb", devicePath)
-        return
-    }
-    unmapOut, unmapErr := exec.Command("/usr/bin/vitastor-ublk", "unmap", devicePath).CombinedOutput()
-    if (unmapErr != nil)
-    {
-        klog.Errorf("failed to unmap UBLK device %s: %s, error: %v", devicePath, unmapOut, unmapErr)
-    }
-    for _, ext := range []string{"json", "pid"}
-    {
-        fn := stateDir + "vitastor-ublk-" + devicePath[10:] + "." + ext
-        err := os.Remove(fn)
-        if (err != nil)
-        {
-            klog.Errorf("failed to remove %s: %v", fn, err)
-        }
-    }
-}
-
 func system(program string, args ...string) ([]byte, []byte, error)
 {
    klog.Infof("Running "+program+" "+strings.Join(args, " "))
@@ -479,43 +340,3 @@ func systemCombined(program string, args ...string) ([]byte, error)
    }
    return out.Bytes(), nil
 }
-
-func GetDeviceNameFromMount(mountPath string) (string, error)
-{
-    // Use /proc/self/mountinfo to correctly parse bind mounts for block device files
-    mps, err := mount.ParseMountInfo("/proc/self/mountinfo")
-    if (err != nil)
-    {
-        return "", err
-    }
-
-    slTarget, err := filepath.EvalSymlinks(mountPath)
-    if (err != nil)
-    {
-        slTarget = mountPath
-    }
-
-    device := ""
-    for _, mp := range mps
-    {
-        if (mp.MountPoint == slTarget)
-        {
-            device = mp.Source
-            if (device[0] != '/' && mp.Root != "/")
-            {
-                // Handle {Source=udev Root=/vdb MountPoint=/var/lib/kubelet/tralaleylo/tralala}
-                for _, other := range mps
-                {
-                    if (other.Root == "/" && other.Source == mp.Source)
-                    {
-                        device = other.MountPoint + mp.Root
-                        break
-                    }
-                }
-            }
-            break
-        }
-    }
-
-    return device, nil
-}
@@ -1,4 +1,7 @@
 #!/bin/bash

-docker build --build-arg DISTRO=debian --build-arg REL=bookworm -t vitastor-buildenv:bookworm -f vitastor-buildenv.Dockerfile .
-docker run -it --rm -e REL=bookworm -v `dirname $0`/../:/root/vitastor vitastor-buildenv:bookworm /root/vitastor/debian/vitastor-build.sh
+cat < vitastor.Dockerfile > ../Dockerfile
+cd ..
+mkdir -p packages
+sudo podman build --build-arg DISTRO=debian --build-arg REL=bookworm -v `pwd`/packages:/root/packages -f Dockerfile .
+rm Dockerfile
@@ -1,4 +1,7 @@
 #!/bin/bash

-docker build --build-arg DISTRO=debian --build-arg REL=bullseye -t vitastor-buildenv:bullseye -f vitastor-buildenv.Dockerfile .
-docker run -it --rm -e REL=bullseye -v `dirname $0`/../:/root/vitastor vitastor-buildenv:bullseye /root/vitastor/debian/vitastor-build.sh
+cat < vitastor.Dockerfile > ../Dockerfile
+cd ..
+mkdir -p packages
+sudo podman build --build-arg DISTRO=debian --build-arg REL=bullseye -v `pwd`/packages:/root/packages -f Dockerfile .
+rm Dockerfile
@@ -1,4 +1,7 @@
 #!/bin/bash

-docker build --build-arg DISTRO=debian --build-arg REL=buster -t vitastor-buildenv:buster -f vitastor-buildenv.Dockerfile .
-docker run -it --rm -e REL=buster -v `dirname $0`/../:/root/vitastor vitastor-buildenv:buster /root/vitastor/debian/vitastor-build.sh
+cat < vitastor.Dockerfile > ../Dockerfile
+cd ..
+mkdir -p packages
+sudo podman build --build-arg DISTRO=debian --build-arg REL=buster -v `pwd`/packages:/root/packages -f Dockerfile .
+rm Dockerfile
@@ -1,4 +0,0 @@
-#!/bin/bash
-
-docker build --build-arg DISTRO=debian --build-arg REL=trixie -t vitastor-buildenv:trixie -f vitastor-buildenv.Dockerfile .
-docker run -it --rm -e REL=trixie -v `dirname $0`/../:/root/vitastor vitastor-buildenv:trixie /root/vitastor/debian/vitastor-build.sh
@@ -1,5 +1,7 @@
 #!/bin/bash
-# Ubuntu 22.04 Jammy Jellyfish

-docker build --build-arg DISTRO=ubuntu --build-arg REL=jammy -t vitastor-buildenv:jammy -f vitastor-buildenv.Dockerfile .
-docker run -it --rm -e REL=jammy -v `dirname $0`/../:/root/vitastor vitastor-buildenv:jammy /root/vitastor/debian/vitastor-build.sh
+cat < vitastor.Dockerfile > ../Dockerfile
+cd ..
+mkdir -p packages
+sudo podman build --build-arg DISTRO=ubuntu --build-arg REL=jammy -v `pwd`/packages:/root/packages -f Dockerfile .
+rm Dockerfile
@@ -1,5 +0,0 @@
-#!/bin/bash
-# 24.04 Noble Numbat
-
-docker build --build-arg DISTRO=ubuntu --build-arg REL=noble -t vitastor-buildenv:noble -f vitastor-buildenv.Dockerfile .
-docker run -it --rm -e REL=noble -v `dirname $0`/../:/root/vitastor vitastor-buildenv:noble /root/vitastor/debian/vitastor-build.sh
@@ -1,5 +0,0 @@
-#!/bin/bash
-# 25.10 Questing quokka
-
-docker build --build-arg DISTRO=ubuntu --build-arg REL=questing -t vitastor-buildenv:questing -f vitastor-buildenv.Dockerfile .
-docker run -it --rm -e REL=questing -v `dirname $0`/../:/root/vitastor vitastor-buildenv:questing /root/vitastor/debian/vitastor-build.sh
@@ -1,4 +1,4 @@
-vitastor (2.4.3-1) unstable; urgency=medium
+vitastor (2.1.0-1) unstable; urgency=medium

  * Bugfixes

@@ -2,9 +2,9 @@ Source: vitastor
 Section: admin
 Priority: optional
 Maintainer: Vitaliy Filippov <vitalif@yourcmc.ru>
-Build-Depends: debhelper, g++ (>= 8), libstdc++6 (>= 8),
+Build-Depends: debhelper, liburing-dev (>= 0.6), g++ (>= 8), libstdc++6 (>= 8),
  linux-libc-dev, libgoogle-perftools-dev, libjerasure-dev, libgf-complete-dev,
-  libibverbs-dev, librdmacm-dev, libisal-dev, cmake, pkg-config, libnl-3-dev, libnl-genl-3-dev,
+  libibverbs-dev, libisal-dev, cmake, pkg-config, libnl-3-dev, libnl-genl-3-dev,
  node-bindings <!nocheck>, node-gyp, node-nan
 Standards-Version: 4.5.0
 Homepage: https://vitastor.io/
@@ -26,7 +26,7 @@ RUN if [ "$REL" = "buster" -o "$REL" = "bullseye" -o "$REL" = "bookworm" ]; then
    echo 'APT::Install-Suggests false;' >> /etc/apt/apt.conf

 RUN apt-get update
-RUN DEBIAN_FRONTEND=noninteractive TZ=Europe/Moscow apt-get -y install fio libgoogle-perftools-dev devscripts
+RUN DEBIAN_FRONTEND=noninteractive TZ=Europe/Moscow apt-get -y install fio liburing-dev libgoogle-perftools-dev devscripts
 RUN DEBIAN_FRONTEND=noninteractive TZ=Europe/Moscow apt-get -y build-dep qemu
 # To build a custom version
 #RUN cp /root/packages/qemu-orig/* /root
@@ -1,65 +0,0 @@
-#!/bin/bash
-# To be ran inside buildenv docker
-
-set -e -x
-
-[ -e /usr/lib/x86_64-linux-gnu/pkgconfig/libisal.pc ] || cp /root/vitastor/debian/libisal.pc /usr/lib/x86_64-linux-gnu/pkgconfig
-
-mkdir -p /root/fio-build/
-cd /root/fio-build/
-rm -rf /root/fio-build/*
-dpkg-source -x /root/fio*.dsc
-
-FULLVER=`head -n1 /root/vitastor/debian/changelog | perl -pe 's/^.*\((.*?)\).*$/$1/'`
-VER=${FULLVER%%-*}
-rm -rf /root/vitastor-$VER
-mkdir /root/vitastor-$VER
-cd /root/vitastor
-cp -a $(ls | grep -v packages) /root/vitastor-$VER
-
-rm -rf /root/vitastor/packages/vitastor-$REL
-mkdir -p /root/vitastor/packages/vitastor-$REL
-mv /root/vitastor-$VER /root/vitastor/packages/vitastor-$REL/
-
-cd /root/vitastor/packages/vitastor-$REL/vitastor-$VER
-
-rm -rf fio
-ln -s /root/fio-build/fio-*/ ./fio
-FIO=`head -n1 fio/debian/changelog | perl -pe 's/^.*\((.*?)\).*$/$1/'`
-ls /usr/include/linux/raw.h || cp ./debian/raw.h /usr/include/linux/raw.h
-sh copy-fio-includes.sh
-rm fio
-mkdir -p a b debian/patches
-mv fio-copy b/fio
-diff -NaurpbB a b > debian/patches/fio-headers.patch || true
-echo fio-headers.patch >> debian/patches/series
-rm -rf a b
-
-echo "dep:fio=$FIO" > debian/fio_version
-
-cd /root/vitastor/packages/vitastor-$REL/vitastor-$VER
-mkdir mon/node_modules
-cd mon/node_modules
-curl -s https://git.yourcmc.ru/vitalif/antietcd/archive/master.tar.gz | tar -zx
-curl -s https://git.yourcmc.ru/vitalif/tinyraft/archive/master.tar.gz | tar -zx
-
-cd /root/vitastor/packages/vitastor-$REL
-if [[ "$REL" = "trixie" && -e ../vitastor-bookworm/vitastor_$VER.orig.tar.xz ]]; then
-    # Fucking shit, archives differ between bookworm (xz 5.4.1) and trixie (xz 5.8.1)
-    cp ../vitastor-bookworm/vitastor_$VER.orig.tar.xz .
-else
-    tar --sort=name --mtime='2020-01-01' --owner=0 --group=0 --exclude=debian -cJf vitastor_$VER.orig.tar.xz vitastor-$VER
-fi
-cd vitastor-$VER
-DEBEMAIL="Vitaliy Filippov <vitalif@yourcmc.ru>" dch -D $REL -v "$FULLVER""$REL" "Rebuild for $REL"
-DEB_BUILD_OPTIONS=nocheck dpkg-buildpackage --jobs=auto -sa
-rm -rf /root/vitastor/packages/vitastor-$REL/vitastor-*/
-
-# Why does ubuntu rename debug packages to *.ddeb?
-cd /root/vitastor/packages/vitastor-$REL
-if ls *.ddeb >/dev/null; then
-    perl -i -pe 's/\.ddeb/.deb/' *.buildinfo *.changes
-    for i in *.ddeb; do
-        mv $i ${i%%.ddeb}.deb
-    done
-fi
@@ -1,31 +0,0 @@
-# Build environment for building Vitastor packages for Debian inside a container
-# cd ..
-# docker build --build-arg DISTRO=debian --build-arg REL=bullseye -f debian/vitastor.Dockerfile -t vitastor-buildenv:bullseye .
-# docker run --rm -e REL=bullseye -v ./:/root/vitastor /root/vitastor/debian/vitastor-build.sh
-
-ARG DISTRO=debian
-ARG REL=
-FROM $DISTRO:$REL
-ARG DISTRO=debian
-ARG REL=
-
-WORKDIR /root
-
-RUN set -e -x; \
-    if [ "$REL" = "buster" ]; then \
-        perl -i -pe 's/deb.debian.org/archive.debian.org/' /etc/apt/sources.list; \
-        apt-get update; \
-        apt-get -y install wget; \
-        wget https://vitastor.io/debian/pubkey.gpg -O /etc/apt/trusted.gpg.d/vitastor.gpg; \
-        echo "deb https://vitastor.io/debian $REL main" >> /etc/apt/sources.list; \
-    fi; \
-    grep '^deb ' /etc/apt/sources.list | perl -pe 's/^deb/deb-src/' >> /etc/apt/sources.list; \
-    perl -i -pe 's/Types: deb$/Types: deb deb-src/' /etc/apt/sources.list.d/*.sources || true; \
-    echo 'APT::Install-Recommends false;' >> /etc/apt/apt.conf; \
-    echo 'APT::Install-Suggests false;' >> /etc/apt/apt.conf
-
-RUN apt-get update && \
-    apt-get -y install fio libgoogle-perftools-dev devscripts libjerasure-dev cmake \
-        libibverbs-dev librdmacm-dev libisal-dev libnl-3-dev libnl-genl-3-dev curl nodejs npm node-nan node-bindings && \
-    apt-get -y build-dep fio && \
-    apt-get --download-only source fio
@@ -2,7 +2,6 @@ usr/bin/vita
 usr/bin/vitastor-cli
 usr/bin/vitastor-rm
 usr/bin/vitastor-nbd
-usr/bin/vitastor-ublk
 usr/bin/vitastor-nfs
 usr/bin/vitastor-kv
 usr/bin/vitastor-kv-stress
@@ -0,0 +1,65 @@
+# Build Vitastor packages for Debian inside a container
+# cd ..; podman build --build-arg DISTRO=debian --build-arg REL=bullseye -v `pwd`/packages:/root/packages -f debian/vitastor.Dockerfile .
+
+ARG DISTRO=debian
+ARG REL=
+FROM $DISTRO:$REL
+ARG DISTRO=debian
+ARG REL=
+
+WORKDIR /root
+
+RUN set -e -x; \
+    if [ "$REL" = "buster" ]; then \
+        apt-get update; \
+        apt-get -y install wget; \
+        wget https://vitastor.io/debian/pubkey.gpg -O /etc/apt/trusted.gpg.d/vitastor.gpg; \
+        echo "deb https://vitastor.io/debian $REL main" >> /etc/apt/sources.list; \
+    fi; \
+    grep '^deb ' /etc/apt/sources.list | perl -pe 's/^deb/deb-src/' >> /etc/apt/sources.list; \
+    perl -i -pe 's/Types: deb$/Types: deb deb-src/' /etc/apt/sources.list.d/debian.sources || true; \
+    echo 'APT::Install-Recommends false;' >> /etc/apt/apt.conf; \
+    echo 'APT::Install-Suggests false;' >> /etc/apt/apt.conf
+
+RUN apt-get update && \
+    apt-get -y install fio liburing-dev libgoogle-perftools-dev devscripts libjerasure-dev cmake \
+        libibverbs-dev librdmacm-dev libisal-dev libnl-3-dev libnl-genl-3-dev curl nodejs npm node-nan node-bindings && \
+    apt-get -y build-dep fio && \
+    apt-get --download-only source fio
+
+ADD . /root/vitastor
+RUN set -e -x; \
+    [ -e /usr/lib/x86_64-linux-gnu/pkgconfig/libisal.pc ] || cp /root/vitastor/debian/libisal.pc /usr/lib/x86_64-linux-gnu/pkgconfig; \
+    mkdir -p /root/fio-build/; \
+    cd /root/fio-build/; \
+    rm -rf /root/fio-build/*; \
+    dpkg-source -x /root/fio*.dsc; \
+    mkdir -p /root/packages/vitastor-$REL; \
+    rm -rf /root/packages/vitastor-$REL/*; \
+    cd /root/packages/vitastor-$REL; \
+    FULLVER=$(head -n1 /root/vitastor/debian/changelog | perl -pe 's/^.*\((.*?)\).*$/$1/'); \
+    VER=${FULLVER%%-*}; \
+    cp -r /root/vitastor vitastor-$VER; \
+    cd vitastor-$VER; \
+    ln -s /root/fio-build/fio-*/ ./fio; \
+    FIO=$(head -n1 fio/debian/changelog | perl -pe 's/^.*\((.*?)\).*$/$1/'); \
+    ls /usr/include/linux/raw.h || cp ./debian/raw.h /usr/include/linux/raw.h; \
+    sh copy-fio-includes.sh; \
+    rm fio; \
+    mkdir -p a b debian/patches; \
+    mv fio-copy b/fio; \
+    diff -NaurpbB a b > debian/patches/fio-headers.patch || true; \
+    echo fio-headers.patch >> debian/patches/series; \
+    rm -rf a b; \
+    echo "dep:fio=$FIO" > debian/fio_version; \
+    cd /root/packages/vitastor-$REL/vitastor-$VER; \
+    mkdir mon/node_modules; \
+    cd mon/node_modules; \
+    curl -s https://git.yourcmc.ru/vitalif/antietcd/archive/master.tar.gz | tar -zx; \
+    curl -s https://git.yourcmc.ru/vitalif/tinyraft/archive/master.tar.gz | tar -zx; \
+    cd /root/packages/vitastor-$REL; \
+    tar --sort=name --mtime='2020-01-01' --owner=0 --group=0 --exclude=debian -cJf vitastor_$VER.orig.tar.xz vitastor-$VER; \
+    cd vitastor-$VER; \
+    DEBFULLNAME="Vitaliy Filippov <vitalif@yourcmc.ru>" dch -D $REL -v "$FULLVER""$REL" "Rebuild for $REL"; \
+    DEB_BUILD_OPTIONS=nocheck dpkg-buildpackage --jobs=auto -sa; \
+    rm -rf /root/packages/vitastor-$REL/vitastor-*/
@@ -3,7 +3,7 @@
 FROM debian:bookworm

 ADD etc/apt /etc/apt/
-RUN apt-get update && apt-get -y install vitastor ibverbs-providers udev systemd qemu-system-x86 qemu-system-common qemu-block-extra qemu-utils jq nfs-common && apt-get clean
+RUN apt-get update && apt-get -y install vitastor udev systemd qemu-system-x86 qemu-system-common qemu-block-extra qemu-utils jq nfs-common && apt-get clean
 ADD sleep.sh /usr/bin/
 ADD install.sh /usr/bin/
 ADD scripts /opt/scripts/
@@ -1,4 +1,4 @@
-VITASTOR_VERSION ?= v2.4.3
+VITASTOR_VERSION ?= v2.1.0

 all: build push

@@ -1,3 +0,0 @@
-Package: *
-Pin: release n=bookworm-backports
-Pin-Priority: 500
@@ -4,7 +4,7 @@
 #

 # Desired Vitastor version
-VITASTOR_VERSION=v2.4.3
+VITASTOR_VERSION=v2.1.0

 # Additional arguments for all containers
 # For example, you may want to specify a custom logging driver here
@@ -24,10 +24,6 @@ affect their interaction with the cluster.
 - [nbd_max_devices](#nbd_max_devices)
 - [nbd_max_part](#nbd_max_part)
 - [osd_nearfull_ratio](#osd_nearfull_ratio)
- [hostname](#hostname)
- [ublk_queue_depth](#ublk_queue_depth)
- [ublk_max_io_size](#ublk_max_io_size)
- [qemu_file_mirror_path](#qemu_file_mirror_path)

 ## client_iothread_count

@@ -219,37 +215,3 @@ just one OSD becomes 100 % full!
 However, unlike in Ceph, 100 % full Vitastor OSDs don't crash (in Ceph they're
 unable to start at all), so you'll be able to recover from "out of space" errors
 without destroying and recreating OSDs.
-
-## hostname
-
- Type: string
- Can be changed online: yes
-
-Clients use host name to find their distance to OSDs when [localized reads](pool.en.md#local_reads)
-are enabled. By default, standard [gethostname](https://man7.org/linux/man-pages/man2/gethostname.2.html)
-function is used to determine host name, but you can also override it with this parameter.
-
-## ublk_queue_depth
-
- Type: integer
- Default: 256
-
-Default queue depth for [Vitastor ublk servers](../usage/ublk.en.md).
-
-## ublk_max_io_size
-
- Type: integer
-
-Default maximum I/O size for Vitastor [ublk servers](../usage/ublk.en.md).
-The largest of 1 MB and pool block size multiplied by EC data chunk count is used if not specified.
-
-## qemu_file_mirror_path
-
- Type: string
-
-When set to an FS directory path (for example, `/mnt/vitastor/`), `qemu-img info` and similar
-QAPI commands return the name of the image inside this directory instead of normal
-`vitastor://?image=abc` URI as `filename`.
-
-This allows to then mount this path using [vitastor-nfs](../usage/nfs.en.md) and trick
-third-party systems like Veeam which rely on `filename` in the image info but don't support Vitastor.
@@ -24,10 +24,6 @@
 - [nbd_max_devices](#nbd_max_devices)
 - [nbd_max_part](#nbd_max_part)
 - [osd_nearfull_ratio](#osd_nearfull_ratio)
- [hostname](#hostname)
- [ublk_queue_depth](#ublk_queue_depth)
- [ublk_max_io_size](#ublk_max_io_size)
- [qemu_file_mirror_path](#qemu_file_mirror_path)

 ## client_iothread_count

@@ -223,40 +219,3 @@ RDMA и хотите повысить пиковую производитель
 заполненные на 100% OSD вообще не могут стартовать), так что вы сможете
 восстановить работу кластера после ошибок отсутствия свободного места
 без уничтожения и пересоздания OSD.
-
-## hostname
-
- Тип: строка
- Можно менять на лету: да
-
-Клиенты используют имя хоста для определения расстояния до OSD, когда включены
-[локальные чтения](pool.ru.md#local_reads). По умолчанию для определения имени
-хоста используется стандартная функция [gethostname](https://man7.org/linux/man-pages/man2/gethostname.2.html),
-но вы также можете задать имя хоста вручную данным параметром.
-
-## ublk_queue_depth
-
- Тип: целое число
- Значение по умолчанию: 256
-
-Глубина очереди по умолчанию для [ublk-серверов Vitastor](../usage/ublk.ru.md).
-
-## ublk_max_io_size
-
- Тип: целое число
-
-Максимальный размер запроса ввода-вывода для [ublk-серверов Vitastor](../usage/ublk.ru.md).
-Если не задан, используется максимум из 1 МБ и размера блока пула, умноженного на число частей
-данных EC-пула.
-
-## qemu_file_mirror_path
-
- Тип: строка
-
-Если установить эту опцию равной пути к каталогу в ФС, команда `qemu-img info` и подобные
-команды QAPI будут возвращать в поле `filename` имя образа внутри заданного каталога вместо
-обычного адреса типа `vitastor://?image=abc`.
-
-Это позволяет смонтировать этот путь с помощью [vitastor-nfs](../usage/nfs.ru.md) и обмануть
-сторонние системы типа Veeam, которые полагаются на поле `filename` в информации об образе QEMU,
-но не поддерживают Vitastor.
@@ -74,7 +74,7 @@ Consider `use_rdmacm` for such networks.
 ## use_rdmacm

 - Type: boolean
- Default: false
+- Default: true

 Use an alternative implementation of RDMA through RDMA-CM (Connection
 Manager). Works with all RDMA networks: Infiniband, iWARP and
@@ -74,7 +74,7 @@ RDMA-устройства, но они не имеют соединения с
 ## use_rdmacm

 - Тип: булево (да/нет)
- Значение по умолчанию: false
+- Значение по умолчанию: true

 Использовать альтернативную реализацию RDMA на основе RDMA-CM (Connection
 Manager). Работает со всеми типами RDMA-сетей: Infiniband, iWARP и
@@ -63,8 +63,6 @@ with an OSD restart or, for some of them, even without restarting by updating co
 - [discard_on_start](#discard_on_start)
 - [min_discard_size](#min_discard_size)
 - [allow_net_split](#allow_net_split)
- [enable_pg_locks](#enable_pg_locks)
- [pg_lock_retry_interval_ms](#pg_lock_retry_interval_ms)

 ## bind_address

@@ -491,7 +489,7 @@ Can be used to slow down scrubbing if it affects user load too much.
 ## scrub_list_limit

 - Type: integer
- Default: 262144
+- Default: 1000
 - Can be changed online: yes

 Number of objects to list in one listing operation during scrub.
@@ -649,20 +647,3 @@ The downside is that it increases the probability of writing data into just pg_m
 OSDs during failover which can lead to PGs becoming incomplete after additional outages.

 The old behaviour in versions up to 2.0.0 was equal to enabled allow_net_split.
-
-## enable_pg_locks
-
- Type: boolean
-
-Vitastor 2.2.0 introduces a new layer of split-brain prevention mechanism in
-addition to etcd: PG locks. They prevent split-brain even in abnormal theoretical cases
-when etcd is extremely laggy. As a new feature, by default, PG locks are only enabled
-for pools where they're required - pools with [localized reads](pool.en.md#local_reads).
-Use this parameter to enable or disable this function for all pools.
-
-## pg_lock_retry_interval_ms
-
- Type: milliseconds
- Default: 100
-
-Retry interval for failed PG lock attempts.
@@ -64,8 +64,6 @@
 - [discard_on_start](#discard_on_start)
 - [min_discard_size](#min_discard_size)
 - [allow_net_split](#allow_net_split)
- [enable_pg_locks](#enable_pg_locks)
- [pg_lock_retry_interval_ms](#pg_lock_retry_interval_ms)

 ## bind_address

@@ -514,7 +512,7 @@ fsync небезопасным даже с режимом "directsync".
 ## scrub_list_limit

 - Тип: целое число
- Значение по умолчанию: 262144
+- Значение по умолчанию: 1000
 - Можно менять на лету: да

 Размер загружаемых за одну операцию списков объектов в процессе фоновой
@@ -681,21 +679,3 @@ pg_minsize OSD во время переключений, что может по
 неполными (incomplete), если упадут ещё какие-то OSD.

 Старое поведение в версиях до 2.0.0 было идентично включённому allow_net_split.
-
-## enable_pg_locks
-
- Тип: булево (да/нет)
-
-В Vitastor 2.2.0 появился новый слой защиты от сплитбрейна в дополнение к etcd -
-блокировки PG. Они гарантируют порядок даже в теоретических ненормальных случаях,
-когда etcd очень сильно тормозит. Так как функция новая, по умолчанию она включается
-только для пулов, в которых она необходима - а именно, в пулах с включёнными
-[локальными чтениями](pool.ru.md#local_reads). Ну а с помощью данного параметра
-можно включить блокировки PG для всех пулов.
-
-## pg_lock_retry_interval_ms
-
- Тип: миллисекунды
- Значение по умолчанию: 100
-
-Интервал повтора неудачных попыток блокировки PG.
@@ -34,7 +34,6 @@ Parameters:
 - [failure_domain](#failure_domain)
 - [level_placement](#level_placement)
 - [raw_placement](#raw_placement)
- [local_reads](#local_reads)
 - [max_osd_combinations](#max_osd_combinations)
 - [block_size](#block_size)
 - [bitmap_granularity](#bitmap_granularity)
@@ -134,8 +133,8 @@ Pool name.
 ## scheme

 - Type: string
- One of: "replicated", "xor", "ec" or "jerasure"
 - Required
+- One of: "replicated", "xor", "ec" or "jerasure"

 Redundancy scheme used for data in this pool. "jerasure" is an alias for "ec",
 both use Reed-Solomon-Vandermonde codes based on ISA-L or jerasure libraries.
@@ -290,30 +289,6 @@ Examples:
 - EC 4+2 in 3 DC: `any, dc=1 host!=1, dc!=1, dc=3 host!=3, dc!=(1,3), dc=5 host!=5`
 - 1 replica in fixed DC + 2 in random DCs: `dc?=meow, dc!=1, dc!=(1,2)`

-## local_reads
-
- Type: string
- One of: "primary", "nearest" or "random"
- Default: primary
-
-By default, Vitastor serves all read and write requests from the primary OSD of each PG.
-But it can also serve read requests for replicated pools from secondary OSDs in clean PGs
-(active or active+left_on_dead) which may be useful if you have OSDs with different network
-latency to the client - for example, if you have a cross-datacenter setup.
-
-If you set this parameter to "nearest", clients will try to read from the nearest OSD
-in the [Placement Tree](#placement-tree), i.e. from an OSD from the same host or datacenter.
-Distance to different OSDs will be calculated based on client hostname, determined
-automatically or set manually in the [hostname](client.en.md#hostname) parameter.
-
-If you set this parameter to "random", clients will try to distribute read requests over
-all available secondary OSDs. This mode is mainly useful for tests, but, probably, not
-really required in production setups.
-
-[PG locks](osd.en.md#enable_pg_locks) are required for local reads to function. However,
-PG locks are enabled automatically by default for pools with enabled local reads, so you
-don't have to enable them explicitly.
-
 ## max_osd_combinations

 - Type: integer
@@ -349,8 +324,7 @@ Read more about this parameter in [Cluster-Wide Disk Layout Parameters](layout-c

 ## immediate_commit

- Type: string
- One of: "all", "small" or "none"
+- Type: string, one of "all", "small" and "none"
 - Default: none

 Immediate commit setting for this pool. The value from /vitastor/config/global
@@ -33,7 +33,6 @@
 - [failure_domain](#failure_domain)
 - [level_placement](#level_placement)
 - [raw_placement](#raw_placement)
- [local_reads](#local_reads)
 - [max_osd_combinations](#max_osd_combinations)
 - [block_size](#block_size)
 - [bitmap_granularity](#bitmap_granularity)
@@ -134,8 +133,8 @@ OSD игнорируется и OSD не удаляется из распред
 ## scheme

 - Тип: строка
- Возможные значения: "replicated", "xor", "ec" или "jerasure"
 - Обязательный
+- Возможные значения: "replicated", "xor", "ec" или "jerasure"

 Схема избыточности, используемая в данном пуле. "jerasure" - синоним для "ec",
 в обеих схемах используются коды Рида-Соломона-Вандермонда, реализованные на
@@ -288,30 +287,6 @@ meow недоступен".
 - EC 4+2 в 3 датацентрах: `any, dc=1 host!=1, dc!=1, dc=3 host!=3, dc!=(1,3), dc=5 host!=5`
 - 1 копия в фиксированном ДЦ + 2 в других ДЦ: `dc?=meow, dc!=1, dc!=(1,2)`

-## local_reads
-
- Тип: строка
- Возможные значения: "primary", "nearest" или "random"
- По умолчанию: primary
-
-По умолчанию Vitastor обслуживает все запросы чтения и записи с первичного OSD каждой PG.
-Однако, в чистых PG (active или active+left_on_dead) реплицированных пулов также есть
-возможность обслуживать запросы чтения с вторичных OSD, что может быть полезно, если
-у вас сильно отличается время сетевого обращения от клиента к разным OSD - например,
-если у вас несколько дата-центров.
-
-Если данный параметр установлен в значение "nearest", клиенты будут стараться читать с
-ближайших по [Дереву размещения](#дерево-размещения) OSD, то есть, с OSD с того же хоста
-или датацентра. Расстояние до разных OSD будет рассчитываться с помощью имени хоста клиента,
-определяемого автоматически или заданного вручную параметром [hostname](client.ru.md#hostname).
-
-Если данный параметр установлен в значение "random", клиенты будут стараться распределять
-запросы чтения по всем доступным вторичным OSD. Этот режим в основном полезен для тестов,
-но, скорее всего, редко нужен в реальных инсталляциях.
-
-Для работы локальных чтений требуются [блокировки PG](osd.ru.md#enable_pg_locks). Включать
-их явно не нужно - они включаются автоматически для пулов с включёнными локальными чтениями.
-
 ## max_osd_combinations

 - Тип: целое число
@@ -349,8 +324,7 @@ meow недоступен".

 ## immediate_commit

- Тип: строка
- Возможные значения: "all", "small" или "none"
+- Тип: строка "all", "small" или "none"
 - По умолчанию: none

 Настройка мгновенного коммита для данного пула. Если не задана, используется
@@ -271,48 +271,3 @@
    заполненные на 100% OSD вообще не могут стартовать), так что вы сможете
    восстановить работу кластера после ошибок отсутствия свободного места
    без уничтожения и пересоздания OSD.
- name: hostname
-  type: string
-  online: true
-  info: |
-    Clients use host name to find their distance to OSDs when [localized reads](pool.en.md#local_reads)
-    are enabled. By default, standard [gethostname](https://man7.org/linux/man-pages/man2/gethostname.2.html)
-    function is used to determine host name, but you can also override it with this parameter.
-  info_ru: |
-    Клиенты используют имя хоста для определения расстояния до OSD, когда включены
-    [локальные чтения](pool.ru.md#local_reads). По умолчанию для определения имени
-    хоста используется стандартная функция [gethostname](https://man7.org/linux/man-pages/man2/gethostname.2.html),
-    но вы также можете задать имя хоста вручную данным параметром.
- name: ublk_queue_depth
-  type: int
-  default: 256
-  online: false
-  info: Default queue depth for [Vitastor ublk servers](../usage/ublk.en.md).
-  info_ru: Глубина очереди по умолчанию для [ublk-серверов Vitastor](../usage/ublk.ru.md).
- name: ublk_max_io_size
-  type: int
-  online: false
-  info: |
-    Default maximum I/O size for Vitastor [ublk servers](../usage/ublk.en.md).
-    The largest of 1 MB and pool block size multiplied by EC data chunk count is used if not specified.
-  info_ru: |
-    Максимальный размер запроса ввода-вывода для [ublk-серверов Vitastor](../usage/ublk.ru.md).
-    Если не задан, используется максимум из 1 МБ и размера блока пула, умноженного на число частей
-    данных EC-пула.
- name: qemu_file_mirror_path
-  type: string
-  info: |
-    When set to an FS directory path (for example, `/mnt/vitastor/`), `qemu-img info` and similar
-    QAPI commands return the name of the image inside this directory instead of normal
-    `vitastor://?image=abc` URI as `filename`.
-
-    This allows to then mount this path using [vitastor-nfs](../usage/nfs.en.md) and trick
-    third-party systems like Veeam which rely on `filename` in the image info but don't support Vitastor.
-  info_ru: |
-    Если установить эту опцию равной пути к каталогу в ФС, команда `qemu-img info` и подобные
-    команды QAPI будут возвращать в поле `filename` имя образа внутри заданного каталога вместо
-    обычного адреса типа `vitastor://?image=abc`.
-
-    Это позволяет смонтировать этот путь с помощью [vitastor-nfs](../usage/nfs.ru.md) и обмануть
-    сторонние системы типа Veeam, которые полагаются на поле `filename` в информации об образе QEMU,
-    но не поддерживают Vitastor.
@@ -24,8 +24,6 @@

 {{../../installation/kubernetes.en.md}}

-{{../../installation/s3.en.md}}
-
 {{../../installation/source.en.md}}

 {{../../config.en.md|indent=1}}
@@ -56,8 +54,6 @@

 {{../../usage/fio.en.md}}

-{{../../usage/ublk.en.md}}
-
 {{../../usage/nbd.en.md}}

 {{../../usage/qemu.en.md}}
@@ -26,8 +26,6 @@

 {{../../installation/source.ru.md}}

-{{../../installation/s3.ru.md}}
-
 {{../../config.ru.md|indent=1}}

 {{../../config/common.ru.md|indent=2}}
@@ -56,8 +54,6 @@

 {{../../usage/fio.ru.md}}

-{{../../usage/ublk.ru.md}}
-
 {{../../usage/nbd.ru.md}}

 {{../../usage/qemu.ru.md}}
@@ -51,7 +51,7 @@
    Рассмотрите включение `use_rdmacm` для таких сетей.
 - name: use_rdmacm
  type: bool
-  default: false
+  default: true
  info: |
    Use an alternative implementation of RDMA through RDMA-CM (Connection
    Manager). Works with all RDMA networks: Infiniband, iWARP and
@@ -566,7 +566,7 @@
    сильно влияет на пользовательскую нагрузку.
 - name: scrub_list_limit
  type: int
-  default: 262144
+  default: 1000
  online: true
  info: |
    Number of objects to list in one listing operation during scrub.
@@ -781,23 +781,3 @@
    неполными (incomplete), если упадут ещё какие-то OSD.

    Старое поведение в версиях до 2.0.0 было идентично включённому allow_net_split.
- name: enable_pg_locks
-  type: bool
-  info: |
-    Vitastor 2.2.0 introduces a new layer of split-brain prevention mechanism in
-    addition to etcd: PG locks. They prevent split-brain even in abnormal theoretical cases
-    when etcd is extremely laggy. As a new feature, by default, PG locks are only enabled
-    for pools where they're required - pools with [localized reads](pool.en.md#local_reads).
-    Use this parameter to enable or disable this function for all pools.
-  info_ru: |
-    В Vitastor 2.2.0 появился новый слой защиты от сплитбрейна в дополнение к etcd -
-    блокировки PG. Они гарантируют порядок даже в теоретических ненормальных случаях,
-    когда etcd очень сильно тормозит. Так как функция новая, по умолчанию она включается
-    только для пулов, в которых она необходима - а именно, в пулах с включёнными
-    [локальными чтениями](pool.ru.md#local_reads). Ну а с помощью данного параметра
-    можно включить блокировки PG для всех пулов.
- name: pg_lock_retry_interval_ms
-  type: ms
-  default: 100
-  info: Retry interval for failed PG lock attempts.
-  info_ru: Интервал повтора неудачных попыток блокировки PG.
@@ -26,9 +26,9 @@ at Vitastor Kubernetes operator: https://github.com/Antilles7227/vitastor-operat
 The instruction is very simple.

 1. Download a Docker image of the desired version: \
-   `docker pull vitalif/vitastor:v2.4.3`
+   `docker pull vitastor:2.1.0`
 2. Install scripts to the host system: \
-   `docker run --rm -it -v /etc:/host-etc -v /usr/bin:/host-bin vitalif/vitastor:v2.4.3 install.sh`
+   `docker run --rm -it -v /etc:/host-etc -v /usr/bin:/host-bin vitastor:2.1.0 install.sh`
 3. Reload udev rules: \
   `udevadm control --reload-rules`

@@ -25,9 +25,9 @@ Vitastor можно установить в Docker/Podman. При этом etcd,
 Инструкция по установке максимально простая.

 1. Скачайте Docker-образ желаемой версии: \
-   `docker pull vitalif/vitastor:v2.4.3`
+   `docker pull vitastor:2.1.0`
 2. Установите скрипты в хост-систему командой: \
-   `docker run --rm -it -v /etc:/host-etc -v /usr/bin:/host-bin vitalif/vitastor:v2.4.3 install.sh`
+   `docker run --rm -it -v /etc:/host-etc -v /usr/bin:/host-bin vitastor:2.1.0 install.sh`
 3. Перезагрузите правила udev: \
   `udevadm control --reload-rules`

@@ -30,7 +30,7 @@ volume_backend_name = vitastor-testcluster
 image_volume_cache_enabled = True
 volume_clear = none
 vitastor_etcd_address = 192.168.7.2:2379
-vitastor_etcd_prefix = /vitastor
+vitastor_etcd_prefix =
 vitastor_config_path = /etc/vitastor/vitastor.conf
 vitastor_pool_id = 1
 image_upload_use_cinder_backend = True
@@ -29,7 +29,7 @@ volume_backend_name = vitastor-testcluster
 image_volume_cache_enabled = True
 volume_clear = none
 vitastor_etcd_address = 192.168.7.2:2379
-vitastor_etcd_prefix = /vitastor
+vitastor_etcd_prefix =
 vitastor_config_path = /etc/vitastor/vitastor.conf
 vitastor_pool_id = 1
 image_upload_use_cinder_backend = True
@@ -11,20 +11,12 @@
 - Trust Vitastor package signing key:
  `wget https://vitastor.io/debian/pubkey.gpg -O /etc/apt/trusted.gpg.d/vitastor.gpg`
 - Add Vitastor package repository to your /etc/apt/sources.list:
-  - Debian 13 (Trixie/Sid): `deb https://vitastor.io/debian trixie main`
-  - Debian 12 (Bookworm): `deb https://vitastor.io/debian bookworm main`
+  - 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`
  - Ubuntu 22.04 (Jammy): `deb https://vitastor.io/debian jammy main`
-  - Ubuntu 24.04 (Noble): `deb https://vitastor.io/debian noble 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
- To always prefer vitastor-patched QEMU and Libvirt versions, add the following to `/etc/apt/preferences`:
-  ```
-  Package: *
-  Pin: origin "vitastor.io"
-  Pin-Priority: 501
-  ```
 - Install packages: `apt update; apt install vitastor lp-solve etcd linux-image-amd64 qemu-system-x86`

 ## CentOS
@@ -50,6 +42,7 @@
  recommended because io_uring is a relatively new technology and there is
  at least one bug which reproduces with io_uring and HP SmartArray
  controllers in 5.4
+- liburing 0.4 or newer
 - lp_solve
 - etcd 3.4.15 or newer. Earlier versions won't work because of various bugs,
  for example [#12402](https://github.com/etcd-io/etcd/pull/12402).
@@ -11,20 +11,12 @@
 - Добавьте ключ репозитория Vitastor:
  `wget https://vitastor.io/debian/pubkey.gpg -O /etc/apt/trusted.gpg.d/vitastor.gpg`
 - Добавьте репозиторий Vitastor в /etc/apt/sources.list:
-  - Debian 13 (Trixie/Sid): `deb https://vitastor.io/debian trixie main`
-  - Debian 12 (Bookworm): `deb https://vitastor.io/debian bookworm main`
+  - 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`
  - Ubuntu 22.04 (Jammy): `deb https://vitastor.io/debian jammy main`
-  - Ubuntu 24.04 (Noble): `deb https://vitastor.io/debian noble main`
  - Добавьте `-oldstable` к слову bookworm/bullseye/buster в этой строке, чтобы
    установить последнюю стабильную версию из ветки 0.9.x вместо 1.x
- Чтобы всегда предпочитались версии пакетов QEMU и Libvirt с патчами Vitastor, добавьте в `/etc/apt/preferences`:
-  ```
-  Package: *
-  Pin: origin "vitastor.io"
-  Pin-Priority: 501
-  ```
 - Установите пакеты: `apt update; apt install vitastor lp-solve etcd linux-image-amd64 qemu-system-x86`

 ## CentOS
@@ -49,6 +41,7 @@
 - Ядро Linux 5.4 или новее, для поддержки io_uring. Рекомендуется даже 5.8,
  так как io_uring - относительно новый интерфейс и в версиях до 5.8 встречались
  некоторые баги, например, зависание с io_uring и контроллером HP SmartArray
+- liburing 0.4 или новее
 - lp_solve
 - etcd 3.4.15 или новее. Более старые версии не будут работать из-за разных багов,
  например, [#12402](https://github.com/etcd-io/etcd/pull/12402).
@@ -6,10 +6,10 @@

 # Proxmox VE

-To enable Vitastor support in Proxmox Virtual Environment (6.4-8.x are supported):
+To enable Vitastor support in Proxmox Virtual Environment (6.4-8.1 are supported):

 - Add the corresponding Vitastor Debian repository into sources.list on Proxmox hosts:
-  trixie for 9.0+, bookworm for 8.1+, pve8.0 for 8.0, bullseye for 7.4, pve7.3 for 7.3, pve7.2 for 7.2, pve7.1 for 7.1, buster for 6.4
+  bookworm for 8.1, pve8.0 for 8.0, bullseye for 7.4, pve7.3 for 7.3, pve7.2 for 7.2, pve7.1 for 7.1, buster for 6.4
 - Install vitastor-client, pve-qemu-kvm, pve-storage-vitastor (* or see note) packages from Vitastor repository
 - Define storage in `/etc/pve/storage.cfg` (see below)
 - Block network access from VMs to Vitastor network (to OSDs and etcd),
@@ -6,10 +6,10 @@

 # Proxmox VE

-Чтобы подключить Vitastor к Proxmox Virtual Environment (поддерживаются версии 6.4-8.x):
+Чтобы подключить Vitastor к Proxmox Virtual Environment (поддерживаются версии 6.4-8.1):

 - Добавьте соответствующий Debian-репозиторий Vitastor в sources.list на хостах Proxmox:
-  trixie для 9.0+, bookworm для 8.1+, pve8.0 для 8.0, bullseye для 7.4, pve7.3 для 7.3, pve7.2 для 7.2, pve7.1 для 7.1, buster для 6.4
+  bookworm для 8.1, pve8.0 для 8.0, bullseye для 7.4, pve7.3 для 7.3, pve7.2 для 7.2, pve7.1 для 7.1, buster для 6.4
 - Установите пакеты vitastor-client, pve-qemu-kvm, pve-storage-vitastor (* или см. сноску) из репозитория Vitastor
 - Определите тип хранилища в `/etc/pve/storage.cfg` (см. ниже)
 - Обязательно заблокируйте доступ от виртуальных машин к сети Vitastor (OSD и etcd), т.к. Vitastor (пока) не поддерживает аутентификацию
@@ -15,7 +15,7 @@
 - gcc and g++ 8 or newer, clang 10 or newer, or other compiler with C++11 plus
  designated initializers support from C++20
 - CMake
- jerasure headers and libraries
+- liburing, jerasure headers and libraries
 - ISA-L, libibverbs and librdmacm headers and libraries (optional)
 - tcmalloc (google-perftools-dev)

@@ -15,7 +15,7 @@
 - gcc и g++ >= 8, либо clang >= 10, либо другой компилятор с поддержкой C++11 плюс
  назначенных инициализаторов (designated initializers) из C++20
 - CMake
- Заголовки и библиотеки jerasure
+- Заголовки и библиотеки liburing, jerasure
 - Опционально - заголовки и библиотеки ISA-L, libibverbs, librdmacm
 - tcmalloc (google-perftools-dev)

@@ -125,13 +125,6 @@ All other client-side components are based on the client library:
  all current read/write operations to it fail with EPIPE error and are retried by clients.
 - After completing all secondary read/write requests, primary OSD sends the response to
  the client.
- When [localized reads](../config/pool.en.md#local_reads) are enabled for a PG in a
-  replicated pool, and the PG is in an active and clean state (active or
-  active+left_on_dead), the client can send the request to one of secondary OSDs instead
-  of the primary. Secondary OSD checks the [PG lock](../config/osd.en.md#enable_pg_locks)
-  and handles the request locally without communicating to the primary. PG lock is required
-  for the secondary OSD to know for sure that the PG is in clean state and not switching
-  primary at the moment.

 ### Nuances of request handling

@@ -125,12 +125,6 @@
  и если любое из этих соединений отключается, PG перезапускается, а все текущие запросы чтения
  и записи в неё завершаются с ошибкой EPIPE, после чего повторяются клиентами.
 - После завершения всех вторичных операций чтения/записи первичный OSD отправляет ответ клиенту.
- Если в реплицированном пуле включены [локализованные чтения](../config/pool.ru.md#local_reads),
-  а PG находится в чистом активном состоянии (active или active+left_on_dead), клиент может
-  послать запрос к одному из вторичных OSD вместо первичного. Вторичный OSD проверяет
-  [блокировку PG](../config/osd.ru.md#enable_pg_locks) и обрабатывает запрос локально, не
-  обращаясь к первичному. Блокировка PG здесь нужна, чтобы вторичный OSD мог точно знать,
-  что PG находится в чистом состоянии и не переключается на другой первичный OSD.

 ### Особенности обработки запросов

@@ -10,17 +10,8 @@ Copyright (c) Vitaliy Filippov (vitalif [at] yourcmc.ru), 2019+

 Join Vitastor Telegram Chat: https://t.me/vitastor

-License: VNPL 1.1 for server-side code and dual VNPL 1.1 + GPL 2.0+ for client tools.
-
-Server-side code is licensed only under the terms of VNPL.
-
-Client libraries (cluster_client and so on) are dual-licensed under the same
-VNPL 1.1 and also GNU GPL 2.0 or later to allow for compatibility with GPLed
-software like QEMU and fio.
-
-## VNPL
-
-Vitastor Network Public License 1.1 (VNPL 1.1) is a copyleft license based on
+All server-side code (OSD, Monitor and so on) is licensed under the terms of
+Vitastor Network Public License 1.1 (VNPL 1.1), a copyleft license based on
 GNU GPLv3.0 with the additional "Network Interaction" clause which requires
 opensourcing all programs directly or indirectly interacting with Vitastor
 through a computer network and expressly designed to be used in conjunction
@@ -29,83 +20,18 @@ the terms of the same license, but also under the terms of any GPL-Compatible
 Free Software License, as listed by the Free Software Foundation.
 This is a stricter copyleft license than the Affero GPL.

-The idea of VNPL is, in addition to modules linked to Vitastor code in a single
-binary file, to extend copyleft action to micro-service modules only interacting
-with it over the network.
+Please note that VNPL doesn't require you to open the code of proprietary
+software running inside a VM if it's not specially designed to be used with
+Vitastor.

 Basically, you can't use the software in a proprietary environment to provide
 its functionality to users without opensourcing all intermediary components
 standing between the user and Vitastor or purchasing a commercial license
 from the author 😀.

-At the same time, VNPL doesn't impose any restrictions on software *not specially designed*
-to be used with Vitastor, for example, on Windows running inside a VM with a Vitastor disk.
+Client libraries (cluster_client and so on) are dual-licensed under the same
+VNPL 1.1 and also GNU GPL 2.0 or later to allow for compatibility with GPLed
+software like QEMU and fio.

-## Explanation
-
-Network copyleft is governed by the clause **13. Remote Network Interaction** of VNPL.
-
-A program is considered to be a "Proxy Program" if it meets both conditions:
- It is specially designed to be used with Vitastor. Basically, it means that the program
-  has any functionality specific to Vitastor and thus "knows" that it works with Vitastor,
-  not with something random.
- It interacts with Vitastor directly or indirectly through any programming interface,
-  including API, CLI, network or any wrapper (also considered a Proxy Program itself).
-
-If, in addition to that:
- You give any user an apportunity to interact with Vitastor directly or indirectly through
-  any computer interface including the network or any number of wrappers (Proxy Programs).
-
-Then VNPL requires you to publish the code of all above Proxy Programs to all above users
-under the terms of any GPL-compatible license - that is, GPL, LGPL, MIT/BSD or Apache 2,
-because "GPL compatibility" is treated as an ability to legally include licensed code in
-a GPL application.
-
-So, if you have a "Proxy Program", but it's not open to the user who directly or indirectly
-interacts with Vitastor - you are forbidden to use Vitastor under the terms of VNPL and you
-need a commercial license which doesn't contain open-source requirements.
-
-## Examples
-
- Vitastor Kubernetes CSI driver which creates PersistentVolumes by calling `vitastor-cli create`.
-  - Yes, it interacts with Vitastor through vitastor-cli.
-  - Yes, it is designed specially for use with Vitastor (it has no sense otherwise).
-  - So, CSI driver **definitely IS** a Proxy Program and must be published under the terms of
-    a free software license.
- Windows, installed in a VM with the system disk on Vitastor storage.
-  - Yes, it interacts with Vitastor indirectly - it reads and writes data through the block
-    device interface, emulated by QEMU.
-  - No, it definitely isn't designed specially for use with Vitastor - Windows was created long
-    ago before Vitastor and doesn't know anything about it.
-  - So, Windows **definitely IS NOT** a Proxy Program and VNPL doesn't require to open it.
- Cloud control panel which makes requests to Vitastor Kubernetes CSI driver.
-  - Yes, it interacts with Vitastor indirectly through the CSI driver, which is a Proxy Program.
-  - May or may not be designed specially for use with Vitastor. How to determine exactly?
-    Imagine that Vitastor is replaced with any other storage (for example, with a proprietary).
-    Do control panel functions change in any way? If they do (for example, if snapshots stop working),
-    then the panel contains specific functionality and thus is designed specially for use with Vitastor.
-    Otherwise, the panel is universal and isn't designed specially for Vitastor.
-  - So, whether you are required to open-source the panel also **depends** on whether it
-    contains specific functionality or not.
-
-## Why?
-
-Because I believe into the spirit of copyleft (Linux wouldn't become so popular without GPL!)
-and, at the same time, I want to have a way to monetize the product.
-
-Existing licenses including AGPL are useless for it with an SDS - SDS is a very deeply
-internal software which is almost definitely invisible to the user and thus AGPL doesn't
-require anyone to open the code even if they make a proprietary fork.
-
-And, in fact, the current situation in the world where GPL is though to only restrict direct
-linking of programs into a single executable file, isn't much correct. Nowadays, programs
-are more often linked with network API calls, not with /usr/bin/ld, and a software product
-may consist of dozens of microservices interacting with each other over the network.
-
-That's why we need VNPL to keep the license sufficiently copyleft.
-
-## License Texts
-
- VNPL 1.1 in English: [VNPL-1.1.txt](../../VNPL-1.1.txt)
- VNPL 1.1 in Russian: [VNPL-1.1-RU.txt](../../VNPL-1.1-RU.txt)
- GPL 2.0: [GPL-2.0.txt](../../GPL-2.0.txt)
+You can find the full text of VNPL-1.1 in the file [VNPL-1.1.txt](../../VNPL-1.1.txt).
+GPL 2.0 is also included in this repository as [GPL-2.0.txt](../../GPL-2.0.txt).
@@ -12,14 +12,6 @@

 Лицензия: VNPL 1.1 на серверный код и двойная VNPL 1.1 + GPL 2.0+ на клиентский.

-Серверные компоненты распространяются только на условиях VNPL.
-
-Клиентские библиотеки распространяются на условиях двойной лицензии VNPL 1.0
-и также на условиях GNU GPL 2.0 или более поздней версии. Так сделано в целях
-совместимости с таким ПО, как QEMU и fio.
-
-## VNPL
-
 VNPL - "сетевой копилефт", собственная свободная копилефт-лицензия
 Vitastor Network Public License 1.1, основанная на GNU GPL 3.0 с дополнительным
 условием "Сетевого взаимодействия", требующим распространять все программы,
@@ -37,70 +29,9 @@ Vitastor Network Public License 1.1, основанная на GNU GPL 3.0 с д
 На Windows и любое другое ПО, не разработанное *специально* для использования
 вместе с Vitastor, никакие ограничения не накладываются.

-## Пояснение
+Клиентские библиотеки распространяются на условиях двойной лицензии VNPL 1.0
+и также на условиях GNU GPL 2.0 или более поздней версии. Так сделано в целях
+совместимости с таким ПО, как QEMU и fio.

-Сетевой копилефт регулируется пунктом лицензии **13. Удалённое сетевое взаимодействие**.
-
-Программа считается "прокси-программой", если верны оба условия:
- Она создана специально для работы вместе с Vitastor. По сути это означает, что программа
-  должна иметь специфичный для Vitastor функционал, то есть, "знать", что она взаимодействует
-  именно с Vitastor.
- Она прямо или косвенно взаимодействует с Vitastor через абсолютно любой программный
-  интерфейс, включая любые способы вызова: API, CLI, сеть или через какую-то обёртку (в
-  свою очередь тоже являющуюся прокси-программой).
-
-Если в дополнение к этому также:
- Вы предоставляете любому пользователю возможность взаимодействовать с Vitastor по сети,
-  опять-таки, через любой интерфейс или любую серию "обёрток" (прокси-программ)
-
-То, согласно VNPL, вы должны открыть код "прокси-программ" **таким пользователям** на условиях
-любой GPL-совместимой лицензии - то есть, GPL, LGPL, MIT/BSD или Apache 2 - "совместимость с GPL"
-понимается как возможность включать лицензируемый код в GPL-приложение.
-
-Соответственно, если у вас есть "прокси-программа", но её код не открыт пользователю,
-который прямо или косвенно взаимодействует с Vitastor - вам запрещено использовать Vitastor
-на условиях VNPL и вам нужна коммерческая лицензия, не содержащая требований об открытии кода.
-
-## Примеры
-
- Kubernetes CSI-драйвер Vitastor, создающий PersistentVolume с помощью вызова `vitastor-cli create`.
-  - Да, взаимодействует с Vitastor через vitastor-cli.
-  - Да, создавался специально для работы с Vitastor (иначе в чём же ещё его смысл).
-  - Значит, CSI-драйвер **точно считается** "прокси-программой" и должен быть открыт под свободной
-    лицензией.
- Windows, установленный в виртуальную машину на диске Vitastor.
-  - Да, взаимодействует с Vitastor "прямо или косвенно" - пишет и читает данные через интерфейс
-    блочного устройства, эмулируемый QEMU.
-  - Нет, точно не создан *специально для работы с Vitastor* - когда его создавали, никакого
-    Vitastor ещё и в помине не было.
-  - Значит, Windows **точно не считается** "прокси-программой" и на него требования VNPL не распространяются.
- Панель управления облака, делающая запросы к Kubernetes CSI-драйверу Vitastor.
-  - Да, взаимодействует с Vitastor косвенно через CSI-драйвер, являющийся "прокси-программой".
-  - Сходу не известно, создавалась ли конкретно для работы с Vitastor. Как понять, да или нет?
-    Представьте, что Vitastor заменён на любую другую систему хранения (например, на проприетарную).
-    Работа панели управления изменится? Если да (например, перестанут работать снапшоты) - значит,
-    панель содержит специфичный функционал и "создана специально для работы с Vitastor".
-    Если нет - значит, специфичного функционала панель не содержит и в принципе она универсальна.
-  - Нужно ли открывать панель - **зависит** от того, содержит она специфичный функционал или нет.
-
-## Почему так?
-
-Потому что я одновременно верю в дух копилефт-лицензий (Linux не стал бы так популярен,
-если бы не GPL!) и хочу иметь возможность монетизации продукта.
-
-При этом использовать даже AGPL для программной СХД бессмысленно - это глубоко внутреннее
-ПО, которое пользователь почти наверняка не увидит вообще, поэтому и открывать код никому
-никогда не придётся, даже при создании производного продукта.
-
-Да и в целом сложившаяся в мире ситуация, при которой действие GPL ограничивается только
-прямым связыванием в один исполняемый файл, не очень корректна. В настоящее время программы
-гораздо чаще интегрируют сетевыми вызовами, а не с помощью /usr/bin/ld, и общий программный
-продукт может состоять из нескольких десятков микросервисов, взаимодействующих по сети.
-
-Поэтому для сохранения достаточной "копилефтности" и придумана VNPL.
-
-## Тексты лицензий
-
- VNPL 1.1 на английском языке: [VNPL-1.1.txt](../../VNPL-1.1.txt)
- VNPL 1.1 на русском языке: [VNPL-1.1-RU.txt](../../VNPL-1.1-RU.txt)
- GPL 2.0: [GPL-2.0.txt](../../GPL-2.0.txt)
+Вы можете найти полный текст VNPL 1.1 на английском языке в файле [VNPL-1.1.txt](../../VNPL-1.1.txt),
+VNPL 1.1 на русском языке в файле [VNPL-1.1-RU.txt](../../VNPL-1.1-RU.txt), а GPL 2.0 в файле [GPL-2.0.txt](../../GPL-2.0.txt).
@@ -25,7 +25,6 @@
 - Recovery of degraded blocks
 - Rebalancing (data movement between OSDs)
 - [Lazy fsync support](../config/layout-cluster.en.md#immediate_commit)
- [Localized read support](../config/pool.en.md#local_reads) for cross-datacenter setup optimization
 - Per-OSD and per-image I/O and space usage statistics in etcd
 - 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)
@@ -52,7 +51,7 @@
 - Generic user-space client library
 - [Native QEMU driver](../usage/qemu.en.md)
 - [Loadable fio engine for benchmarks](../usage/fio.en.md)
- [UBLK](../usage/ublk.en.md) and [NBD](../usage/nbd.en.md) servers for kernel mounts
+- [NBD proxy for kernel mounts](../usage/nbd.en.md)
 - [Simplified NFS proxy for file-based image access emulation (suitable for VMWare)](../usage/nfs.en.md#pseudo-fs)

 ## Roadmap
@@ -25,7 +25,6 @@
 - Восстановление деградированных блоков
 - Ребаланс, то есть перемещение данных между OSD (дисками)
 - [Поддержка "ленивого" fsync (fsync не на каждую операцию)](../config/layout-cluster.ru.md#immediate_commit)
- [Локальные чтения](../config/pool.ru.md#local_reads) для оптимизации при нескольких датацентрах
 - Сбор статистики ввода/вывода в etcd
 - Статистика операций ввода/вывода и занятого места в разрезе инодов
 - Именование инодов через хранение их метаданных в etcd
@@ -54,7 +53,7 @@
 - Общая пользовательская клиентская библиотека для работы с кластером
 - [Драйвер диска для QEMU](../usage/qemu.ru.md)
 - [Драйвер диска для утилиты тестирования производительности fio](../usage/fio.ru.md)
- [UBLK](../usage/ublk.ru.md) и [NBD](../usage/nbd.ru.md) серверы для монтирования образов ядром ("блочное устройство в режиме пользователя")
+- [NBD-прокси для монтирования образов ядром](../usage/nbd.ru.md) ("блочное устройство в режиме пользователя")
 - [Упрощённая NFS-прокси для эмуляции файлового доступа к образам (подходит для VMWare)](../usage/nfs.ru.md#псевдо-фс)

 ## Планы развития
@@ -14,7 +14,6 @@
 - [Removing a failed disk](#removing-a-failed-disk)
 - [Adding a disk](#adding-a-disk)
 - [Restoring from lost pool configuration](#restoring-from-lost-pool-configuration)
- [Incompatibility problems](#Incompatibility-problems)
 - [Upgrading Vitastor](#upgrading-vitastor)
 - [OSD memory usage](#osd-memory-usage)

@@ -167,17 +166,6 @@ done

 After that all PGs should peer and find all previous data.

-## Incompatibility problems
-
-### ISA-L 2.31
-
-⚠ It is FORBIDDEN to use Vitastor 2.1.0 and earlier versions with ISA-L 2.31 and newer if
-you use EC N+K pools and K > 1 on a CPU with GF-NI instruction support, because it WILL
-lead to **data loss** during EC recovery.
-
-If you accidentally upgraded ISA-L to 2.31 but didn't upgrade Vitastor and restarted OSDs,
-then stop them as soon as possible and either update Vitastor or roll back ISA-L.
-
 ## Upgrading Vitastor

 Every upcoming Vitastor version is usually compatible with previous both forward
@@ -14,7 +14,6 @@
 - [Удаление неисправного диска](#удаление-неисправного-диска)
 - [Добавление диска](#добавление-диска)
 - [Восстановление потерянной конфигурации пулов](#восстановление-потерянной-конфигурации-пулов)
- [Проблемы несовместимости](#проблемы-несовместимости)
 - [Обновление Vitastor](#обновление-vitastor)
 - [Потребление памяти OSD](#потребление-памяти-osd)

@@ -164,17 +163,6 @@ done

 После этого все PG должны пройти peering и найти все предыдущие данные.

-## Проблемы несовместимости
-
-### ISA-L 2.31
-
-⚠ ЗАПРЕЩЕНО использовать Vitastor 2.1.0 и более ранних версий с библиотекой ISA-L версии 2.31
-или более новой, если вы используете EC-пулы N+K и K > 1 на CPU с поддержкой инструкций GF-NI,
-так как это приведёт к **потере данных** при восстановлении из EC.
-
-Если вы случайно обновили ISA-L до 2.31, но не обновили Vitastor, и успели перезапустить OSD,
-то как можно скорее остановите их все и либо обновите Vitastor, либо откатите ISA-L.
-
 ## Обновление Vitastor

 Обычно каждая следующая версия Vitastor совместима с предыдущими и "вперёд", и "назад"
@@ -100,14 +100,12 @@ List images (only matching `<glob>` pattern(s) if passed).
 Options:

 ```
--exact         Do not match glob patterns as names, select only exact name matches.
 -p|--pool POOL  Filter images by pool ID or name
 -l|--long       Also report allocated size and I/O statistics
 --del           Also include delete operation statistics
 --sort FIELD    Sort by specified field (name, size, used_size, <read|write|delete>_<iops|bps|lat|queue>)
 -r|--reverse    Sort in descending order
 -n|--count N    Only list first N items
--tree          Show image snapshot/clone tree
 ```

 Example output:
@@ -399,7 +397,6 @@ Optional parameters:
 | `--immediate_commit none`      | Put pool only on OSDs with this or larger immediate_commit (none < small < all) |
 | `--level_placement <rules>`    | Use additional failure domain rules (example: "dc=112233")                 |
 | `--raw_placement <rules>`      | Specify raw PG generation rules ([details](../config/pool.en.md#raw_placement)) |
-| `--local_reads primary`        | Local read policy for replicated pools: primary, nearest or random         |
 | `--primary_affinity_tags tags` | Prefer to put primary copies on OSDs with all specified tags               |
 | `--scrub_interval <time>`      | Enable regular scrubbing for this pool. Format: number + unit s/m/h/d/M/y  |
 | `--used_for_app fs:<name>`     | Mark pool as used for VitastorFS with metadata in image `<name>`           |
@@ -102,14 +102,12 @@ kaveri    2/1     32   0 B      10 G    0 B        100%    0%
 Опции:

 ```
--exact         Не применять ФС-шаблоны к именам, выводить только точные совпадения
 -p|--pool POOL  Фильтровать образы по пулу (ID или имени)
 -l|--long       Также выводить статистику занятого места и ввода-вывода
 --del           Также выводить статистику операций удаления
 --sort FIELD    Сортировать по заданному полю (name, size, used_size, <read|write|delete>_<iops|bps|lat|queue>)
 -r|--reverse    Сортировать в обратном порядке
 -n|--count N    Показывать только первые N записей
--tree          Вывести снапшоты и клоны в виде дерева
 ```

 Пример вывода:
@@ -416,7 +414,6 @@ OSD  PARENT            UP    SIZE  USED%    TAGS          WEIGHT  BLOCK  BITMAP
 | `--immediate_commit none`      | ...только OSD с этим или большим immediate_commit (none < small < all)     |
 | `--level_placement <rules>`    | Задать правила дополнительных доменов отказа (пример: "dc=112233")         |
 | `--raw_placement <rules>`      | Задать низкоуровневые правила генерации PG ([детали](../config/pool.ru.md#raw_placement)) |
-| `--local_reads primary`        | Политика локальных чтений для реплик: primary, nearest или random          |
 | `--primary_affinity_tags tags` | Предпочитать OSD со всеми данными тегами для роли первичных                |
 | `--scrub_interval <time>`      | Включить скрабы с заданным интервалом времени (число + единица s/m/h/d/M/y) |
 | `--pg_stripe_size <number>`    | Увеличить блок группировки объектов по PG                                  |
@@ -73,8 +73,6 @@ Options (automatic mode):
 --max_other 10%
  Use disks for OSD data even if they already have non-Vitastor partitions,
  but only if these take up no more than this percent of disk space.
--dry-run
-  Check and print new OSD count for each disk but do not actually create them.
 ```

 Options (single-device mode):
@@ -74,8 +74,6 @@ vitastor-disk - инструмент командной строки для уп
 --max_other 10%
  Использовать диски под данные OSD, даже если на них уже есть не-Vitastor-овые
  разделы, но только в случае, если они занимают не более данного процента диска.
--dry-run
-  Проверить и вывести число новых OSD для каждого диска, но не создавать их.
 ```

 Опции для режима одного OSD:
@@ -89,8 +89,6 @@ POSIX features currently not implemented in VitastorFS:
  instead of actually allocated space
 - Access times (`atime`) are not tracked (like `-o noatime`)
 - Modification time (`mtime`) is updated lazily every second (like `-o lazytime`)
- Permission enforcement is disabled by default (and Linux NFS client doesn't
-  enforce them too). Use `--enforce 1` to enable it.

 Other notable missing features which should be addressed in the future:
 - Inode ID reuse. Currently inode IDs always grow, the limit is 2^48 inodes, so
@@ -260,5 +258,4 @@ Options:
 | `--nfspath <PATH>` | set NFS export path to \<PATH> (default is /)            |
 | `--pidfile <FILE>` | write process ID to the specified file                   |
 | `--logfile <FILE>` | log to the specified file                                |
-| `--enforce 1`      | enforce permissions at the server side (no by default)   |
 | `--foreground 1`   | stay in foreground, do not daemonize                     |
@@ -91,8 +91,6 @@ JSON-формате :-). Для инспекции содержимого БД
  stat(2), так что `du` всегда показывает сумму размеров файлов, а не фактически занятое место
 - Времена доступа (`atime`) не отслеживаются (как будто ФС смонтирована с `-o noatime`)
 - Времена модификации (`mtime`) отслеживаются асинхронно (как будто ФС смонтирована с `-o lazytime`)
- Привилегии доступа по умолчанию не проверяются сервером (клиент NFS Linux их также не проверяет).
-  Чтобы включить проверки, используйте опцию `--enforce 1`.

 Другие недостающие функции, которые нужно добавить в будущем:
 - Переиспользование номеров инодов. В текущей реализации номера инодов всё время
@@ -272,5 +270,4 @@ VitastorFS из GPUDirect.
 | `--nfspath <PATH>` | установить путь NFS-экспорта в \<PATH> (по умолчанию /) |
 | `--pidfile <FILE>` | записать ID процесса в заданный файл                    |
 | `--logfile <FILE>` | записывать логи в заданный файл                         |
-| `--enforce 1`      | проверять права доступа на стороне сервера (по умолчанию нет) |
 | `--foreground 1`   | не уходить в фон после запуска                          |
@@ -130,16 +130,23 @@ Linux kernel, starting with version 5.15, supports a new interface for attaching
 to the host - VDUSE (vDPA Device in Userspace). QEMU, starting with 7.2, has support for
 exporting QEMU block devices over this protocol using qemu-storage-daemon.

-VDUSE advantages:
-
- VDUSE copies memory 1 time instead of 2, and is thus faster than [NBD](nbd.en.md) for linear read/write.
- It doesn't have NBD timeout problem - the device doesn't die if an operation executes for too long.
+VDUSE is currently the best interface to attach Vitastor disks as kernel devices because:
+- It avoids data copies and thus achieves much better performance than [NBD](nbd.en.md)
+- It doesn't have NBD timeout problem - the device doesn't die if an operation executes for too long
 - It doesn't have hung device problem - if the userspace process dies it can be restarted (!)
-  and block device will continue operation (UBLK can do it too).
- It doesn't seem to have the device number limit (UBLK also doesn't).
+  and block device will continue operation
+- It doesn't seem to have the device number limit

-At the same time, VDUSE may be slower or faster than [UBLK](ublk.en.md) for linear read/write,
-and iops-wise it's sometimes even slower than NBD. See performance comparison examples at the page [UBLK](ublk.en.md).
+Example performance comparison:
+
+|                      | direct fio  | NBD         | VDUSE       |
+|----------------------|-------------|-------------|-------------|
+| linear write         | 3.85 GB/s   | 1.12 GB/s   | 3.85 GB/s   |
+| 4k random write Q128 | 240000 iops | 120000 iops | 178000 iops |
+| 4k random write Q1   | 9500 iops   | 7620 iops   | 7640 iops   |
+| linear read          | 4.3 GB/s    | 1.8 GB/s    | 2.85 GB/s   |
+| 4k random read Q128  | 287000 iops | 140000 iops | 189000 iops |
+| 4k random read Q1    | 9600 iops   | 7640 iops   | 7780 iops   |

 To try VDUSE you need at least Linux 5.15, built with VDUSE support
 (CONFIG_VDPA=m, CONFIG_VDPA_USER=m, CONFIG_VIRTIO_VDPA=m).
@@ -186,12 +193,3 @@ To remove the device:
 vdpa dev del test1
 kill <qemu-storage-daemon_process_PID>
 ```
-
-## Veeam
-
-Vitastor QEMU driver has a feature that allows to trick third-party systems like Veeam not able to parse qemu-img
-vitastor URIs: [qemu_file_mirror_path](../config/client.en.md#qemu_file_mirror_path).
-
-To make such systems work, you should set this option to an FS directory path (for example, `/mnt/vitastor/`) and
-mount this directory using [`vitastor-nfs mount --block`](../usage/nfs.en.md). It will make them access
-your images using files and, hopefully, succeed in doing their normal job :).
@@ -132,16 +132,24 @@ qemu-system-x86_64 -enable-kvm -m 2048 -M accel=kvm,memory-backend=mem \
 к системе - VDUSE (vDPA Device in Userspace), а в QEMU, начиная с версии 7.2, есть поддержка
 экспорта блочных устройств QEMU по этому протоколу через qemu-storage-daemon.

-Преимущества VDUSE:
+VDUSE - на данный момент лучший интерфейс для подключения дисков Vitastor в виде блочных
+устройств на уровне ядра, ибо:
+- VDUSE не копирует данные и поэтому достигает значительно лучшей производительности, чем [NBD](nbd.ru.md)
+- Также оно не имеет проблемы NBD-таймаута - устройство не умирает, если операция выполняется слишком долго
+- Также оно не имеет проблемы подвисающих устройств - если процесс-обработчик умирает, его можно
+  перезапустить (!) и блочное устройство продолжит работать
+- По-видимому, у него нет предела числа подключаемых в систему устройств

- VDUSE копирует данные 1 раз, а не 2, и поэтому он быстрее, чем [NBD](nbd.ru.md) при линейном доступе.
- VDUSE не имеет проблемы NBD-таймаута - устройство не умирает, если операция выполняется слишком долго.
- VDUSE не имеет проблемы подвисающих устройств - если процесс-обработчик умирает, его можно
-  перезапустить (!) и блочное устройство продолжит работать (в UBLK это тоже поддерживается).
- По-видимому, у него нет предела числа подключаемых в систему устройств (в UBLK лимита тоже нет).
+Пример сравнения производительности:

-Однако, при линейном доступе VDUSE может быть медленнее UBLK (а может быть и быстрее), а по iops
-VDUSE иногда даже медленнее NBD. Пример сравнения производительности смотрите на странице [UBLK](ublk.ru.md).
+|                          | Прямой fio  | NBD         | VDUSE       |
+|--------------------------|-------------|-------------|-------------|
+| линейная запись          | 3.85 GB/s   | 1.12 GB/s   | 3.85 GB/s   |
+| 4k случайная запись Q128 | 240000 iops | 120000 iops | 178000 iops |
+| 4k случайная запись Q1   | 9500 iops   | 7620 iops   | 7640 iops   |
+| линейное чтение          | 4.3 GB/s    | 1.8 GB/s    | 2.85 GB/s   |
+| 4k случайное чтение Q128 | 287000 iops | 140000 iops | 189000 iops |
+| 4k случайное чтение Q1   | 9600 iops   | 7640 iops   | 7780 iops   |

 Чтобы попробовать VDUSE, вам нужно ядро Linux как минимум версии 5.15, собранное с поддержкой
 VDUSE (CONFIG_VDPA=m, CONFIG_VDPA_USER=m, CONFIG_VIRTIO_VDPA=m).
@@ -188,12 +196,3 @@ vdpa dev add name test1 mgmtdev vduse
 vdpa dev del test1
 kill <PID_процесса_qemu-storage-daemon>
 ```
-
-## Veeam
-
-Драйвер Vitastor QEMU имеет функцию, которая позволяет обманывать сторонние системы типа Veeam, которые
-не могут сами по себе разобрать адреса дисков в vitastor: [qemu_file_mirror_path](../config/client.ru.md#qemu_file_mirror_path).
-
-Чтобы заставить такие системы работать, вам нужно установить эту опцию равной пути к некоторому каталогу
-в ФС (например, `/mnt/vitastor/`) и примонтировать этот каталог с помощью [`vitastor-nfs mount --block`](../usage/nfs.ru.md).
-Они начнут обращаться к образам как к файлам и, вероятно, смогут заработать корректно :).
@@ -1,116 +0,0 @@
-[Documentation](../../README.md#documentation) → Usage → UBLK
-
-----
-
-[Читать на русском](ublk.ru.md)
-
-# UBLK
-
-[ublk](https://docs.kernel.org/block/ublk.html) is a new io_uring-based Linux interface
-for user-space block device drivers, available since Linux 6.0.
-
-It's not zero-copy, but it's still a fast implementation, outperforming both [NBD](nbd.en.md)
-and [VDUSE](qemu.en.md#vduse) iops-wise and may or may not outperform VDUSE in linear I/O MB/s.
-ublk also allows to recover devices even if the server (vitastor-ublk process) dies.
-
-## Example performance comparison
-
-TCP (100G), 3 hosts each with 6 NVMe OSDs, 3 replicas, single client
-
-|                      | direct fio  | NBD         | VDUSE      | UBLK        |
-|----------------------|-------------|-------------|------------|-------------|
-| linear write         | 3807 MB/s   | 1832 MB/s   | 3226 MB/s  | 3027 MB/s   |
-| linear read          | 3067 MB/s   | 1885 MB/s   | 1800 MB/s  | 2076 MB/s   |
-| 4k random write Q128 | 128624 iops | 91060 iops  | 94621 iops | 149450 iops |
-| 4k random read Q128  | 117769 iops | 153408 iops | 93157 iops | 171987 iops |
-| 4k random write Q1   | 8090 iops   | 6442 iops   | 6316 iops  | 7272 iops   |
-| 4k random read Q1    | 9474 iops   | 7200 iops   | 6840 iops  | 8038 iops   |
-
-RDMA (100G), 3 hosts each with 6 NVMe OSDs, 3 replicas, single client
-
-|                      | direct fio  | NBD         | VDUSE       | UBLK        |
-|----------------------|-------------|-------------|-------------|-------------|
-| linear write         | 6998 MB/s   | 1878 MB/s   | 4249 MB/s   | 3140 MB/s   |
-| linear read          | 8628 MB/s   | 3389 MB/s   | 5062 MB/s   | 3674 MB/s   |
-| 4k random write Q128 | 222541 iops | 181589 iops | 138281 iops | 218222 iops |
-| 4k random read Q128  | 412647 iops | 239987 iops | 151663 iops | 269583 iops |
-| 4k random write Q1   | 11601 iops  | 8592 iops   | 9111 iops   | 10000 iops  |
-| 4k random read Q1    | 10102 iops  | 7788 iops   | 8111 iops   | 8965 iops   |
-
-## Commands
-
-vitastor-ublk supports the following commands:
-
- [map](#map)
- [unmap](#unmap)
- [ls](#ls)
-
-## map
-
-To create a local block device for a Vitastor image run:
-
-```
-vitastor-ublk map [/dev/ublkbN] --image testimg
-```
-
-It will output a block device name like /dev/ublkb0 which you can then use as a normal disk.
-
-You can also use `--pool <POOL> --inode <INODE> --size <SIZE>` instead of `--image <IMAGE>` if you want.
-
-vitastor-ublk supports all usual Vitastor configuration options like `--config_path <path_to_config>` plus ublk-specific:
-
-* `--recover` \
-  Recover a mapped device if the previous ublk server is dead.
-* `--queue_depth 256` \
-  Maximum queue size for the device.
-* `--max_io_size 1M` \
-  Maximum single I/O size for the device. Default: `max(1 MB, pool block size * EC part count)`.
-* `--readonly` \
-  Make the device read-only.
-* `--hdd` \
-  Mark the device as rotational.
-* `--logfile /path/to/log/file.txt` \
-  Write log messages to the specified file instead of dropping them (in background mode)
-  or printing them to the standard output (in foreground mode).
-* `--dev_num N` \
-  Use the specified device /dev/ublkbN instead of automatic selection (alternative syntax
-  to /dev/ublkbN positional parameter).
-* `--foreground 1` \
-  Stay in foreground, do not daemonize.
-
-Note that `ublk_queue_depth` and `ublk_max_io_size` may also be specified
-in `/etc/vitastor/vitastor.conf` or in other configuration file specified with `--config_path`.
-
-## unmap
-
-To unmap the device run:
-
-```
-vitastor-ublk unmap /dev/ublkb0
-```
-
-## ls
-
-```
-vitastor-ublk ls [--json]
-```
-
-List mapped images.
-
-Example output (normal format):
-
-```
-/dev/ublkb0
-image: bench
-pid: 584536
-
-/dev/ublkb1
-image: bench1
-pid: 584546
-```
-
-Example output (JSON format):
-
-```
-{"/dev/ublkb0": {"image": "bench", "pid": 584536}, "/dev/ublkb1": {"image": "bench1", "pid": 584546}}
-```
@@ -1,121 +0,0 @@
-[Документация](../../README-ru.md#документация) → Использование → UBLK
-
-----
-
-[Read in English](ublk.en.md)
-
-# UBLK
-
-[ublk](https://docs.kernel.org/block/ublk.html) - это новый Linux-интерфейс на основе io_uring
-для реализации блочных устройств в пространстве пользователя, доступный, начиная с Linux 6.0.
-
-ublk тоже копирует память (т.е. не является zero-copy), но по IOPS всё равно обгоняет и
-[NBD](nbd.ru.md), и [VDUSE](qemu.ru.md#vduse), и иногда может даже обгонять VDUSE по
-скорости линейного доступа. Также ublk позволяет оживлять устройства, у которых умер
-сервер (процесс-обработчик vitastor-ublk).
-
-## Пример сравнения производительности
-
-TCP (100G), 3 сервера с 6 NVMe OSD каждый, 3 реплики, один клиент
-
-|                          | Прямой fio  | NBD         | VDUSE      | UBLK        |
-|--------------------------|-------------|-------------|------------|-------------|
-| линейная запись          | 3807 MB/s   | 1832 MB/s   | 3226 MB/s  | 3027 MB/s   |
-| линейное чтение          | 3067 MB/s   | 1885 MB/s   | 1800 MB/s  | 2076 MB/s   |
-| 4k случайная запись Q128 | 128624 iops | 91060 iops  | 94621 iops | 149450 iops |
-| 4k случайное чтение Q128 | 117769 iops | 153408 iops | 93157 iops | 171987 iops |
-| 4k случайная запись Q1   | 8090 iops   | 6442 iops   | 6316 iops  | 7272 iops   |
-| 4k случайное чтение Q1   | 9474 iops   | 7200 iops   | 6840 iops  | 8038 iops   |
-
-RDMA (100G), 3 сервера с 6 NVMe OSD каждый, 3 реплики, один клиент
-
-|                          | Прямой fio  | NBD         | VDUSE       | UBLK        |
-|--------------------------|-------------|-------------|-------------|-------------|
-| линейная запись          | 6998 MB/s   | 1878 MB/s   | 4249 MB/s   | 3140 MB/s   |
-| линейное чтение          | 8628 MB/s   | 3389 MB/s   | 5062 MB/s   | 3674 MB/s   |
-| 4k случайная запись Q128 | 222541 iops | 181589 iops | 138281 iops | 218222 iops |
-| 4k случайное чтение Q128 | 412647 iops | 239987 iops | 151663 iops | 269583 iops |
-| 4k случайная запись Q1   | 11601 iops  | 8592 iops   | 9111 iops   | 10000 iops  |
-| 4k случайное чтение Q1   | 10102 iops  | 7788 iops   | 8111 iops   | 8965 iops   |
-
-## Команды
-
-vitastor-ublk поддерживает следующие команды:
-
- [map](#map)
- [unmap](#unmap)
- [ls](#ls)
-
-## map
-
-Чтобы создать локальное блочное устройство для образа, выполните команду:
-
-```
-vitastor-ublk map [/dev/ublkbN] --image testimg
-```
-
-Команда напечатает название блочного устройства вида /dev/ublkb0, которое потом можно
-будет использовать как обычный диск.
-
-Для обращения по номеру инода, аналогично другим командам, можно использовать опции
-`--pool <POOL> --inode <INODE> --size <SIZE>` вместо `--image testimg`.
-
-vitastor-ublk поддерживает все обычные опции Vitastor, например, `--config_path <path_to_config>`,
-плюс специфичные для ublk:
-
-* `--recover` \
-  Восстановить ранее подключённое устройство, у которого умер обработчик.
-* `--queue_depth 256` \
-  Максимальная глубина очереди устройства.
-* `--max_io_size 1M` \
-  Максимальный размер запроса ввода-вывода для устройства. По умолчанию: `max(1 MB, блок данных пула * число частей данных EC)`.
-* `--readonly` \
-  Подключить устройство в режиме только для чтения.
-* `--hdd` \
-  Пометить устройство как вращающийся жёсткий диск (флаг rotational).
-* `--logfile /path/to/log/file.txt` \
-  Писать сообщения о процессе работы в заданный файл, вместо пропуска их
-  при фоновом режиме запуска или печати на стандартный вывод при запуске
-  в консоли с `--foreground 1`.
-* `--dev_num N` \
-  Использовать заданное устройство `/dev/ublkbN` вместо автоматического подбора.
-* `--foreground 1` \
-  Не уводить процесс в фоновый режим.
-
-Обратите внимание, что опции `ublk_queue_depth` и `ublk_max_io_size` можно
-также задавать в `/etc/vitastor/vitastor.conf` или в другом файле конфигурации,
-заданном опцией `--config_path`.
-
-## unmap
-
-Для отключения устройства выполните:
-
-```
-vitastor-ublk unmap /dev/ublkb0
-```
-
-## ls
-
-```
-vitastor-ublk ls [--json]
-```
-
-Вывести подключённые устройства.
-
-Пример вывода в обычном формате:
-
-```
-/dev/ublkb0
-image: bench
-pid: 584536
-
-/dev/ublkb1
-image: bench1
-pid: 584546
-```
-
-Пример вывода в JSON-формате:
-
-```
-{"/dev/ublkb0": {"image": "bench", "pid": 584536}, "/dev/ublkb1": {"image": "bench1", "pid": 584546}}
-```
@@ -96,7 +96,6 @@ class Mon
                    }
                    else
                    {
-                        res.setHeader('Content-Type', 'text/plain; version=0.0.4; charset=utf-8');
                        res.write(export_prometheus_metrics(this.state));
                    }
                }
@@ -15,7 +15,7 @@ function get_osd_tree(global_config, state)
        const stat = state.osd.stats[osd_num];
        const osd_cfg = state.config.osd[osd_num];
        let reweight = osd_cfg == null ? 1 : Number(osd_cfg.reweight);
-        if (isNaN(reweight) || reweight < 0 || reweight > 1)
+        if (isNaN(reweight) || reweight < 0 || reweight > 0)
            reweight = 1;
        if (stat && stat.size && reweight && (state.osd.state[osd_num] || Number(stat.time) >= down_time ||
            osd_cfg && osd_cfg.noout))
@@ -110,7 +110,7 @@ function make_hier_tree(global_config, tree)
            if (!(tree[node_id].children||[]).length && (tree[node_id].size||0) <= 0)
            {
                const parent = tree[node_id].parent;
-                if (parent && tree[parent])
+                if (parent)
                {
                    tree[parent].children = tree[parent].children.filter(c => c != tree[node_id]);
                }
@@ -179,7 +179,7 @@ function filter_osds_by_block_layout(orig_tree, osd_stats, block_size, bitmap_gr
        if (orig_tree[osd].level === 'osd')
        {
            const osd_stat = osd_stats[osd];
-            if (osd_stat && (osd_stat.data_block_size && osd_stat.data_block_size != block_size ||
+            if (osd_stat && (osd_stat.bs_block_size && osd_stat.bs_block_size != block_size ||
                osd_stat.bitmap_granularity && osd_stat.bitmap_granularity != bitmap_granularity ||
                osd_stat.immediate_commit == 'small' && immediate_commit == 'all' ||
                osd_stat.immediate_commit == 'none' && immediate_commit != 'none'))
@@ -1,6 +1,6 @@
 {
  "name": "vitastor-mon",
-  "version": "2.4.3",
+  "version": "2.1.0",
  "description": "Vitastor SDS monitor service",
  "main": "mon-main.js",
  "scripts": {
@@ -9,7 +9,7 @@
  "author": "Vitaliy Filippov",
  "license": "UNLICENSED",
  "dependencies": {
-    "antietcd": "^1.1.3",
+    "antietcd": "^1.1.2",
    "sprintf-js": "^1.1.2",
    "ws": "^7.2.5"
  },
@@ -19,6 +19,6 @@
    "eslint-plugin-node": "^11.1.0"
  },
  "engines": {
-    "node": ">=12.0.0"
+    "node": ">=12.1.0"
  }
 }
@@ -52,16 +52,15 @@ async function run()
        process.exit(1);
    }
    const etcds = (config.etcd_address instanceof Array ? config.etcd_address : (''+config.etcd_address).split(/,/))
-        .map(s => (''+s).replace(/^https?:\/\/|(:\d+)?(\/.*)?$/g, '').replace(/^\[(.*)\]$/, '$1').toLowerCase());
+        .map(s => (''+s).replace(/^https?:\/\/\[?|\]?(:\d+)?(\/.*)?$/g, '').toLowerCase());
    const num = select_local_etcd(etcds);
    if (num < 0)
    {
        console.log('No matching IPs in etcd_address from '+config_path);
        process.exit(0);
    }
-    const etcd_url = 'http://' + (etcds[num].indexOf(':') >= 0 ? '['+etcds[num]+']' : etcds[num]);
    const etcd_name = 'etcd'+etcds[num].replace(/[^0-9a-z_]/ig, '_');
-    const etcd_cluster = etcds.map(e => `etcd${e.replace(/[^0-9a-z_]/ig, '_')}=http://${e.indexOf(':') >= 0 ? '['+e+']' : e}:2380`).join(',');
+    const etcd_cluster = etcds.map(e => `etcd${e.replace(/[^0-9a-z_]/ig, '_')}=http://${e}:2380`).join(',');
    if (in_docker)
    {
        let etcd_conf = fs.readFileSync("/etc/vitastor/etcd.conf", { encoding: 'utf-8' });
@@ -84,8 +83,8 @@ Wants=network-online.target local-fs.target time-sync.target
 Restart=always
 Environment=GOGC=50
 ExecStart=etcd --name ${etcd_name} --data-dir /var/lib/etcd/vitastor \\
-    --snapshot-count 10000 --advertise-client-urls ${etcd_url}:2379 --listen-client-urls ${etcd_url}:2379 \\
-    --initial-advertise-peer-urls ${etcd_url}:2380 --listen-peer-urls ${etcd_url}:2380 \\
+    --snapshot-count 10000 --advertise-client-urls http://${etcds[num]}:2379 --listen-client-urls http://${etcds[num]}:2379 \\
+    --initial-advertise-peer-urls http://${etcds[num]}:2380 --listen-peer-urls http://${etcds[num]}:2380 \\
    --initial-cluster-token vitastor-etcd-1 --initial-cluster ${etcd_cluster} \\
    --initial-cluster-state new --max-txn-ops=100000 --max-request-bytes=104857600 \\
    --auto-compaction-retention=10 --auto-compaction-mode=revision
@@ -276,10 +276,6 @@ function sum_inode_stats(state, prev_stats)
        }
        for (const pool_id in osd_diff.inode_stats)
        {
-            if (!inode_stats[pool_id])
-            {
-                continue;
-            }
            for (const inode_num in prev_stats.osd_diff[osd].inode_stats[pool_id])
            {
                inode_stats[pool_id][inode_num] = inode_stats[pool_id][inode_num] || inode_stub();
@@ -1,6 +1,6 @@
 {
  "name": "vitastor",
-  "version": "2.4.3",
+  "version": "2.1.0",
  "description": "Low-level native bindings to Vitastor client library",
  "main": "index.js",
  "keywords": [
@@ -261,7 +261,7 @@ sub free_image
    my ($vtype, $name, $vmid, undef, undef, undef) = $class->parse_volname($volname);
    $class->deactivate_volume($storeid, $scfg, $volname);
    my $full_list = run_cli($scfg, [ 'ls', '-l' ]);
-    my $list = _process_list($scfg, $storeid, $full_list, 0);
+    my $list = _process_list($scfg, $storeid, $full_list);
    # Remove image and all its snapshots
    my $rm_names = {
        map { ($prefix.$_->{name} => 1) }
@@ -269,10 +269,6 @@ sub free_image
        @$list
    };
    my $children = [ grep { $_->{parent_name} && $rm_names->{$_->{parent_name}} } @$full_list ];
-    $children = [ grep { 
-        substr($_->{name}, 0, length($prefix.$name)) ne $prefix.$name &&
-        substr($_->{name}, 0, length($prefix.$name)+1) ne $prefix.$name.'@'
-    } @$children ];
    die "Image has children: ".join(', ', map {
        substr($_->{name}, 0, length $prefix) eq $prefix
            ? substr($_->name, length $prefix)
@@ -292,15 +288,14 @@ sub free_image

 sub _process_list
 {
-    my ($scfg, $storeid, $result, $skip_snapshot) = @_;
-    $skip_snapshot = 1 if !defined $skip_snapshot;
+    my ($scfg, $storeid, $result) = @_;
    my $prefix = defined $scfg->{vitastor_prefix} ? $scfg->{vitastor_prefix} : 'pve/';
    my $list = [];
    foreach my $el (@$result)
    {
        next if !$el->{name} || length($prefix) && substr($el->{name}, 0, length $prefix) ne $prefix;
        my $name = substr($el->{name}, length $prefix);
-        next if $skip_snapshot && $name =~ /@/;
+        next if $name =~ /@/;
        my ($owner) = $name =~ /^(?:vm|base)-(\d+)-/s;
        next if !defined $owner;
        my $parent = !defined $el->{parent_name}
@@ -415,8 +410,8 @@ sub volume_size_info
    my $prefix = defined $scfg->{vitastor_prefix} ? $scfg->{vitastor_prefix} : 'pve/';
    my ($vtype, $name, $vmid) = $class->parse_volname($volname);
    my $info = _process_list($scfg, $storeid, run_cli($scfg, [ 'ls', $prefix.$name ]))->[0];
-    # (size, format, used, parent, ctime)
-    return wantarray ? ($info->{size}, $info->{format}, $info->{size}, $info->{parent}, 0) : $info->{size};
+    #return wantarray ? ($size, $format, $used, $parent, $st->ctime) : $size;
+    return $info->{size};
 }

 sub volume_resize
@@ -499,55 +494,4 @@ sub rename_volume
    return "${storeid}:${base_name}${target_volname}";
 }

-sub _monkey_patch_qemu_blockdev_options
-{
-    my ($cfg, $volid, $machine_version, $options) = @_;
-    my ($storeid, $volname) = PVE::Storage::parse_volume_id($volid);
-
-    my $scfg = PVE::Storage::storage_config($cfg, $storeid);
-
-    my $plugin = PVE::Storage::Plugin->lookup($scfg->{type});
-
-    my ($vtype) = $plugin->parse_volname($volname);
-    die "cannot use volume of type '$vtype' as a QEMU blockdevice\n"
-        if $vtype ne 'images' && $vtype ne 'iso' && $vtype ne 'import';
-
-    return $plugin->qemu_blockdev_options($scfg, $storeid, $volname, $machine_version, $options);
-}
-
-sub qemu_blockdev_options
-{
-    my ($class, $scfg, $storeid, $volname, $machine_version, $options) = @_;
-    my $prefix = defined $scfg->{vitastor_prefix} ? $scfg->{vitastor_prefix} : 'pve/';
-    my ($vtype, $name, $vmid) = $class->parse_volname($volname);
-    $name .= '@'.$options->{'snapshot-name'} if $options->{'snapshot-name'};
-    if ($scfg->{vitastor_nbd})
-    {
-        my $mapped = run_cli($scfg, [ 'ls' ], binary => '/usr/bin/vitastor-nbd');
-        my ($kerneldev) = grep { $mapped->{$_}->{image} eq $prefix.$name } keys %$mapped;
-        die "Image not mapped via NBD" if !$kerneldev;
-        return { driver => 'host_device', filename => $kerneldev };
-    }
-    my $blockdev = {
-        driver => 'vitastor',
-        image => $prefix.$name,
-    };
-    if ($scfg->{vitastor_config_path})
-    {
-        $blockdev->{'config-path'} = $scfg->{vitastor_config_path};
-    }
-    if ($scfg->{vitastor_etcd_address})
-    {
-        # FIXME This is the only exception: etcd_address -> etcd_host for qemu
-        $blockdev->{'etcd-host'} = $scfg->{vitastor_etcd_address};
-    }
-    if ($scfg->{vitastor_etcd_prefix})
-    {
-        $blockdev->{'etcd-prefix'} = $scfg->{vitastor_etcd_prefix};
-    }
-    return $blockdev;
-}
-
-*PVE::Storage::qemu_blockdev_options = *_monkey_patch_qemu_blockdev_options;
-
 1;
@@ -50,7 +50,7 @@ from cinder.volume import configuration
 from cinder.volume import driver
 from cinder.volume import volume_utils

-VITASTOR_VERSION = '2.4.3'
+VITASTOR_VERSION = '2.1.0'

 LOG = logging.getLogger(__name__)

@@ -1,637 +0,0 @@
-diff --git a/include/libvirt/libvirt-storage.h b/include/libvirt/libvirt-storage.h
-index aaad4a3da1..5f5daa8341 100644
--- a/include/libvirt/libvirt-storage.h
-+++ b/include/libvirt/libvirt-storage.h
-@@ -326,6 +326,7 @@ typedef enum {
-     VIR_CONNECT_LIST_STORAGE_POOLS_ZFS           = 1 << 17, /* (Since: 1.2.8) */
-     VIR_CONNECT_LIST_STORAGE_POOLS_VSTORAGE      = 1 << 18, /* (Since: 3.1.0) */
-     VIR_CONNECT_LIST_STORAGE_POOLS_ISCSI_DIRECT  = 1 << 19, /* (Since: 5.6.0) */
-+    VIR_CONNECT_LIST_STORAGE_POOLS_VITASTOR      = 1 << 20, /* (Since: 5.0.0) */
- } virConnectListAllStoragePoolsFlags;
- 
- int                     virConnectListAllStoragePools(virConnectPtr conn,
-diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
-index 1e24e41a48..ce359a4cf8 100644
--- a/src/conf/domain_conf.c
-+++ b/src/conf/domain_conf.c
-@@ -7435,7 +7435,8 @@ virDomainDiskSourceNetworkParse(xmlNodePtr node,
-     src->configFile = virXPathString("string(./config/@file)", ctxt);
- 
-     if (src->protocol == VIR_STORAGE_NET_PROTOCOL_HTTP ||
-        src->protocol == VIR_STORAGE_NET_PROTOCOL_HTTPS)
-+        src->protocol == VIR_STORAGE_NET_PROTOCOL_HTTPS ||
-+        src->protocol == VIR_STORAGE_NET_PROTOCOL_VITASTOR)
-         src->query = virXMLPropString(node, "query");
- 
-     if (virDomainStorageNetworkParseHosts(node, ctxt, &src->hosts, &src->nhosts) < 0)
-@@ -31871,6 +31872,7 @@ virDomainStorageSourceTranslateSourcePool(virStorageSource *src,
- 
-     case VIR_STORAGE_POOL_MPATH:
-     case VIR_STORAGE_POOL_RBD:
-+    case VIR_STORAGE_POOL_VITASTOR:
-     case VIR_STORAGE_POOL_SHEEPDOG:
-     case VIR_STORAGE_POOL_GLUSTER:
-     case VIR_STORAGE_POOL_LAST:
-diff --git a/src/conf/domain_validate.c b/src/conf/domain_validate.c
-index b28af7fa56..d1aae6e43e 100644
--- a/src/conf/domain_validate.c
-+++ b/src/conf/domain_validate.c
-@@ -504,6 +504,7 @@ virDomainDiskDefValidateSourceChainOne(const virStorageSource *src)
-         case VIR_STORAGE_NET_PROTOCOL_RBD:
-             break;
- 
-+        case VIR_STORAGE_NET_PROTOCOL_VITASTOR:
-         case VIR_STORAGE_NET_PROTOCOL_NBD:
-         case VIR_STORAGE_NET_PROTOCOL_SHEEPDOG:
-         case VIR_STORAGE_NET_PROTOCOL_GLUSTER:
-@@ -576,7 +577,7 @@ virDomainDiskDefValidateSourceChainOne(const virStorageSource *src)
-         }
-     }
- 
-    /* internal snapshots and config files are currently supported only with rbd: */
-+    /* internal snapshots are currently supported only with rbd: */
-     if (virStorageSourceGetActualType(src) != VIR_STORAGE_TYPE_NETWORK &&
-         src->protocol != VIR_STORAGE_NET_PROTOCOL_RBD) {
-         if (src->snapshot) {
-@@ -584,10 +585,14 @@ virDomainDiskDefValidateSourceChainOne(const virStorageSource *src)
-                            _("<snapshot> element is currently supported only with 'rbd' disks"));
-             return -1;
-         }
-
-+    }
-+    /* config files are currently supported only with rbd and vitastor: */
-+    if (virStorageSourceGetActualType(src) != VIR_STORAGE_TYPE_NETWORK &&
-+        src->protocol != VIR_STORAGE_NET_PROTOCOL_RBD &&
-+        src->protocol != VIR_STORAGE_NET_PROTOCOL_VITASTOR) {
-         if (src->configFile) {
-             virReportError(VIR_ERR_XML_ERROR, "%s",
-                           _("<config> element is currently supported only with 'rbd' disks"));
-+                           _("<config> element is currently supported only with 'rbd' and 'vitastor' disks"));
-             return -1;
-         }
-     }
-diff --git a/src/conf/schemas/domaincommon.rng b/src/conf/schemas/domaincommon.rng
-index 183dd5db5e..dcc0d1a778 100644
--- a/src/conf/schemas/domaincommon.rng
-+++ b/src/conf/schemas/domaincommon.rng
-@@ -2066,6 +2066,35 @@
-     </element>
-   </define>
- 
-+  <define name="diskSourceNetworkProtocolVitastor">
-+    <element name="source">
-+      <interleave>
-+        <attribute name="protocol">
-+          <value>vitastor</value>
-+        </attribute>
-+        <ref name="diskSourceCommon"/>
-+        <optional>
-+          <attribute name="name"/>
-+        </optional>
-+        <optional>
-+          <attribute name="query"/>
-+        </optional>
-+        <zeroOrMore>
-+          <ref name="diskSourceNetworkHost"/>
-+        </zeroOrMore>
-+        <optional>
-+          <element name="config">
-+            <attribute name="file">
-+              <ref name="absFilePath"/>
-+            </attribute>
-+            <empty/>
-+          </element>
-+        </optional>
-+        <empty/>
-+      </interleave>
-+    </element>
-+  </define>
-+
-   <define name="diskSourceNetworkProtocolISCSI">
-     <element name="source">
-       <attribute name="protocol">
-@@ -2416,6 +2445,7 @@
-       <ref name="diskSourceNetworkProtocolSimple"/>
-       <ref name="diskSourceNetworkProtocolVxHS"/>
-       <ref name="diskSourceNetworkProtocolNFS"/>
-+      <ref name="diskSourceNetworkProtocolVitastor"/>
-     </choice>
-   </define>
- 
-diff --git a/src/conf/storage_conf.c b/src/conf/storage_conf.c
-index 1dc9365bf2..a8a736be81 100644
--- a/src/conf/storage_conf.c
-+++ b/src/conf/storage_conf.c
-@@ -56,7 +56,7 @@ VIR_ENUM_IMPL(virStoragePool,
-               "logical", "disk", "iscsi",
-               "iscsi-direct", "scsi", "mpath",
-               "rbd", "sheepdog", "gluster",
-              "zfs", "vstorage",
-+              "zfs", "vstorage", "vitastor",
- );
- 
- VIR_ENUM_IMPL(virStoragePoolFormatFileSystem,
-@@ -242,6 +242,18 @@ static virStoragePoolTypeInfo poolTypeInfo[] = {
-           .formatToString = virStorageFileFormatTypeToString,
-       }
-     },
-+    {.poolType = VIR_STORAGE_POOL_VITASTOR,
-+     .poolOptions = {
-+         .flags = (VIR_STORAGE_POOL_SOURCE_HOST |
-+                   VIR_STORAGE_POOL_SOURCE_NETWORK |
-+                   VIR_STORAGE_POOL_SOURCE_NAME),
-+      },
-+      .volOptions = {
-+          .defaultFormat = VIR_STORAGE_FILE_RAW,
-+          .formatFromString = virStorageVolumeFormatFromString,
-+          .formatToString = virStorageFileFormatTypeToString,
-+      }
-+    },
-     {.poolType = VIR_STORAGE_POOL_SHEEPDOG,
-      .poolOptions = {
-          .flags = (VIR_STORAGE_POOL_SOURCE_HOST |
-@@ -538,6 +550,11 @@ virStoragePoolDefParseSource(xmlXPathContextPtr ctxt,
-                        _("element 'name' is mandatory for RBD pool"));
-         return -1;
-     }
-+    if (pool_type == VIR_STORAGE_POOL_VITASTOR && source->name == NULL) {
-+        virReportError(VIR_ERR_XML_ERROR, "%s",
-+                       _("element 'name' is mandatory for Vitastor pool"));
-+        return -1;
-+    }
- 
-     if (options->formatFromString) {
-         g_autofree char *format = NULL;
-@@ -1127,6 +1144,7 @@ virStoragePoolDefFormatBuf(virBuffer *buf,
-     /* RBD, Sheepdog, Gluster and Iscsi-direct devices are not local block devs nor
-      * files, so they don't have a target */
-     if (def->type != VIR_STORAGE_POOL_RBD &&
-+        def->type != VIR_STORAGE_POOL_VITASTOR &&
-         def->type != VIR_STORAGE_POOL_SHEEPDOG &&
-         def->type != VIR_STORAGE_POOL_GLUSTER &&
-         def->type != VIR_STORAGE_POOL_ISCSI_DIRECT) {
-diff --git a/src/conf/storage_conf.h b/src/conf/storage_conf.h
-index fc67957cfe..720c07ef74 100644
--- a/src/conf/storage_conf.h
-+++ b/src/conf/storage_conf.h
-@@ -103,6 +103,7 @@ typedef enum {
-     VIR_STORAGE_POOL_GLUSTER,  /* Gluster device */
-     VIR_STORAGE_POOL_ZFS,      /* ZFS */
-     VIR_STORAGE_POOL_VSTORAGE, /* Virtuozzo Storage */
-+    VIR_STORAGE_POOL_VITASTOR, /* Vitastor */
- 
-     VIR_STORAGE_POOL_LAST,
- } virStoragePoolType;
-@@ -454,6 +455,7 @@ VIR_ENUM_DECL(virStoragePartedFs);
-                  VIR_CONNECT_LIST_STORAGE_POOLS_SCSI     | \
-                  VIR_CONNECT_LIST_STORAGE_POOLS_MPATH    | \
-                  VIR_CONNECT_LIST_STORAGE_POOLS_RBD      | \
-+                 VIR_CONNECT_LIST_STORAGE_POOLS_VITASTOR | \
-                  VIR_CONNECT_LIST_STORAGE_POOLS_SHEEPDOG | \
-                  VIR_CONNECT_LIST_STORAGE_POOLS_GLUSTER  | \
-                  VIR_CONNECT_LIST_STORAGE_POOLS_ZFS      | \
-diff --git a/src/conf/storage_source_conf.c b/src/conf/storage_source_conf.c
-index 8a063be244..dd9c7f11a2 100644
--- a/src/conf/storage_source_conf.c
-+++ b/src/conf/storage_source_conf.c
-@@ -89,6 +89,7 @@ VIR_ENUM_IMPL(virStorageNetProtocol,
-               "ssh",
-               "vxhs",
-               "nfs",
-+              "vitastor",
- );
- 
- 
-@@ -1314,6 +1315,7 @@ virStorageSourceNetworkDefaultPort(virStorageNetProtocol protocol)
-         case VIR_STORAGE_NET_PROTOCOL_GLUSTER:
-             return 24007;
- 
-+        case VIR_STORAGE_NET_PROTOCOL_VITASTOR:
-         case VIR_STORAGE_NET_PROTOCOL_RBD:
-             /* we don't provide a default for RBD */
-             return 0;
-diff --git a/src/conf/storage_source_conf.h b/src/conf/storage_source_conf.h
-index ebddf28cd6..873a2be65c 100644
--- a/src/conf/storage_source_conf.h
-+++ b/src/conf/storage_source_conf.h
-@@ -130,6 +130,7 @@ typedef enum {
-     VIR_STORAGE_NET_PROTOCOL_SSH,
-     VIR_STORAGE_NET_PROTOCOL_VXHS,
-     VIR_STORAGE_NET_PROTOCOL_NFS,
-+    VIR_STORAGE_NET_PROTOCOL_VITASTOR,
- 
-     VIR_STORAGE_NET_PROTOCOL_LAST
- } virStorageNetProtocol;
-diff --git a/src/conf/virstorageobj.c b/src/conf/virstorageobj.c
-index 59fa5da372..4739167f5f 100644
--- a/src/conf/virstorageobj.c
-+++ b/src/conf/virstorageobj.c
-@@ -1438,6 +1438,7 @@ virStoragePoolObjSourceFindDuplicateCb(const void *payload,
-             return 1;
-         break;
- 
-+    case VIR_STORAGE_POOL_VITASTOR:
-     case VIR_STORAGE_POOL_ISCSI_DIRECT:
-     case VIR_STORAGE_POOL_RBD:
-     case VIR_STORAGE_POOL_LAST:
-@@ -1921,6 +1922,8 @@ virStoragePoolObjMatch(virStoragePoolObj *obj,
-                (obj->def->type == VIR_STORAGE_POOL_MPATH))   ||
-               (MATCH(VIR_CONNECT_LIST_STORAGE_POOLS_RBD) &&
-                (obj->def->type == VIR_STORAGE_POOL_RBD))     ||
-+              (MATCH(VIR_CONNECT_LIST_STORAGE_POOLS_VITASTOR) &&
-+               (obj->def->type == VIR_STORAGE_POOL_VITASTOR)) ||
-               (MATCH(VIR_CONNECT_LIST_STORAGE_POOLS_SHEEPDOG) &&
-                (obj->def->type == VIR_STORAGE_POOL_SHEEPDOG)) ||
-               (MATCH(VIR_CONNECT_LIST_STORAGE_POOLS_GLUSTER) &&
-diff --git a/src/libvirt-storage.c b/src/libvirt-storage.c
-index db7660aac4..561df34709 100644
--- a/src/libvirt-storage.c
-+++ b/src/libvirt-storage.c
-@@ -94,6 +94,7 @@ virStoragePoolGetConnect(virStoragePoolPtr pool)
-  * VIR_CONNECT_LIST_STORAGE_POOLS_SCSI
-  * VIR_CONNECT_LIST_STORAGE_POOLS_MPATH
-  * VIR_CONNECT_LIST_STORAGE_POOLS_RBD
-+ * VIR_CONNECT_LIST_STORAGE_POOLS_VITASTOR
-  * VIR_CONNECT_LIST_STORAGE_POOLS_SHEEPDOG
-  * VIR_CONNECT_LIST_STORAGE_POOLS_GLUSTER
-  * VIR_CONNECT_LIST_STORAGE_POOLS_ZFS
-diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c
-index bdd30dd65a..5353e00b4a 100644
--- a/src/libxl/libxl_conf.c
-+++ b/src/libxl/libxl_conf.c
-@@ -1081,6 +1081,7 @@ libxlMakeNetworkDiskSrcStr(virStorageSource *src,
-     case VIR_STORAGE_NET_PROTOCOL_SSH:
-     case VIR_STORAGE_NET_PROTOCOL_VXHS:
-     case VIR_STORAGE_NET_PROTOCOL_NFS:
-+    case VIR_STORAGE_NET_PROTOCOL_VITASTOR:
-     case VIR_STORAGE_NET_PROTOCOL_LAST:
-     case VIR_STORAGE_NET_PROTOCOL_NONE:
-         virReportError(VIR_ERR_NO_SUPPORT,
-diff --git a/src/libxl/xen_xl.c b/src/libxl/xen_xl.c
-index ec8de30c01..61eab9606d 100644
--- a/src/libxl/xen_xl.c
-+++ b/src/libxl/xen_xl.c
-@@ -1461,6 +1461,7 @@ xenFormatXLDiskSrcNet(virStorageSource *src)
-     case VIR_STORAGE_NET_PROTOCOL_SSH:
-     case VIR_STORAGE_NET_PROTOCOL_VXHS:
-     case VIR_STORAGE_NET_PROTOCOL_NFS:
-+    case VIR_STORAGE_NET_PROTOCOL_VITASTOR:
-     case VIR_STORAGE_NET_PROTOCOL_LAST:
-     case VIR_STORAGE_NET_PROTOCOL_NONE:
-         virReportError(VIR_ERR_NO_SUPPORT,
-diff --git a/src/qemu/qemu_block.c b/src/qemu/qemu_block.c
-index 32568d4ae6..e625fa0720 100644
--- a/src/qemu/qemu_block.c
-+++ b/src/qemu/qemu_block.c
-@@ -731,6 +731,38 @@ qemuBlockStorageSourceGetRBDProps(virStorageSource *src,
- }
- 
- 
-+static virJSONValue *
-+qemuBlockStorageSourceGetVitastorProps(virStorageSource *src)
-+{
-+    virJSONValue *ret = NULL;
-+    virStorageNetHostDef *host;
-+    size_t i;
-+    g_auto(virBuffer) buf = VIR_BUFFER_INITIALIZER;
-+    g_autofree char *etcd = NULL;
-+
-+    for (i = 0; i < src->nhosts; i++) {
-+        host = src->hosts + i;
-+        if ((virStorageNetHostTransport)host->transport != VIR_STORAGE_NET_HOST_TRANS_TCP) {
-+            return NULL;
-+        }
-+        virBufferAsprintf(&buf, i > 0 ? ",%s:%u" : "%s:%u", host->name, host->port);
-+    }
-+    if (src->nhosts > 0) {
-+        etcd = virBufferContentAndReset(&buf);
-+    }
-+
-+    if (virJSONValueObjectAdd(&ret,
-+                              "S:etcd-host", etcd,
-+                              "S:etcd-prefix", src->query,
-+                              "S:config-path", src->configFile,
-+                              "s:image", src->path,
-+                              NULL) < 0)
-+        return NULL;
-+
-+    return ret;
-+}
-+
-+
- static virJSONValue *
- qemuBlockStorageSourceGetSshProps(virStorageSource *src)
- {
-@@ -1082,6 +1114,12 @@ qemuBlockStorageSourceGetBackendProps(virStorageSource *src,
-                 return NULL;
-             break;
- 
-+        case VIR_STORAGE_NET_PROTOCOL_VITASTOR:
-+            driver = "vitastor";
-+            if (!(fileprops = qemuBlockStorageSourceGetVitastorProps(src)))
-+                return NULL;
-+            break;
-+
-         case VIR_STORAGE_NET_PROTOCOL_SSH:
-             driver = "ssh";
-             if (!(fileprops = qemuBlockStorageSourceGetSshProps(src)))
-@@ -1985,6 +2023,7 @@ qemuBlockGetBackingStoreString(virStorageSource *src,
- 
-             case VIR_STORAGE_NET_PROTOCOL_SHEEPDOG:
-             case VIR_STORAGE_NET_PROTOCOL_RBD:
-+            case VIR_STORAGE_NET_PROTOCOL_VITASTOR:
-             case VIR_STORAGE_NET_PROTOCOL_VXHS:
-             case VIR_STORAGE_NET_PROTOCOL_NFS:
-             case VIR_STORAGE_NET_PROTOCOL_SSH:
-@@ -2365,6 +2404,12 @@ qemuBlockStorageSourceCreateGetStorageProps(virStorageSource *src,
-                 return -1;
-             break;
- 
-+        case VIR_STORAGE_NET_PROTOCOL_VITASTOR:
-+            driver = "vitastor";
-+            if (!(location = qemuBlockStorageSourceGetVitastorProps(src)))
-+                return -1;
-+            break;
-+
-         case VIR_STORAGE_NET_PROTOCOL_SSH:
-             if (srcPriv->nbdkitProcess) {
-                 /* disk creation not yet supported with nbdkit, and even if it
-diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
-index 0d2548d8d4..91121d6e1f 100644
--- a/src/qemu/qemu_domain.c
-+++ b/src/qemu/qemu_domain.c
-@@ -4526,7 +4526,8 @@ qemuDomainValidateStorageSource(virStorageSource *src,
-     if (src->query &&
-         (actualType != VIR_STORAGE_TYPE_NETWORK ||
-          (src->protocol != VIR_STORAGE_NET_PROTOCOL_HTTPS &&
-          src->protocol != VIR_STORAGE_NET_PROTOCOL_HTTP))) {
-+          src->protocol != VIR_STORAGE_NET_PROTOCOL_HTTP &&
-+          src->protocol != VIR_STORAGE_NET_PROTOCOL_VITASTOR))) {
-         virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
-                        _("query is supported only with HTTP(S) protocols"));
-         return -1;
-@@ -8954,6 +8955,7 @@ qemuDomainPrepareStorageSourceTLS(virStorageSource *src,
-         break;
- 
-     case VIR_STORAGE_NET_PROTOCOL_RBD:
-+    case VIR_STORAGE_NET_PROTOCOL_VITASTOR:
-     case VIR_STORAGE_NET_PROTOCOL_SHEEPDOG:
-     case VIR_STORAGE_NET_PROTOCOL_GLUSTER:
-     case VIR_STORAGE_NET_PROTOCOL_ISCSI:
-diff --git a/src/qemu/qemu_snapshot.c b/src/qemu/qemu_snapshot.c
-index 8128154749..afb339b9b0 100644
--- a/src/qemu/qemu_snapshot.c
-+++ b/src/qemu/qemu_snapshot.c
-@@ -662,6 +662,7 @@ qemuSnapshotPrepareDiskExternalInactive(virDomainSnapshotDiskDef *snapdisk,
-         case VIR_STORAGE_NET_PROTOCOL_NONE:
-         case VIR_STORAGE_NET_PROTOCOL_NBD:
-         case VIR_STORAGE_NET_PROTOCOL_RBD:
-+        case VIR_STORAGE_NET_PROTOCOL_VITASTOR:
-         case VIR_STORAGE_NET_PROTOCOL_SHEEPDOG:
-         case VIR_STORAGE_NET_PROTOCOL_GLUSTER:
-         case VIR_STORAGE_NET_PROTOCOL_ISCSI:
-@@ -887,6 +888,7 @@ qemuSnapshotPrepareDiskInternal(virDomainDiskDef *disk,
-         case VIR_STORAGE_NET_PROTOCOL_NONE:
-         case VIR_STORAGE_NET_PROTOCOL_NBD:
-         case VIR_STORAGE_NET_PROTOCOL_RBD:
-+        case VIR_STORAGE_NET_PROTOCOL_VITASTOR:
-         case VIR_STORAGE_NET_PROTOCOL_SHEEPDOG:
-         case VIR_STORAGE_NET_PROTOCOL_GLUSTER:
-         case VIR_STORAGE_NET_PROTOCOL_ISCSI:
-diff --git a/src/storage/storage_driver.c b/src/storage/storage_driver.c
-index e19e032427..59f91f4710 100644
--- a/src/storage/storage_driver.c
-+++ b/src/storage/storage_driver.c
-@@ -1626,6 +1626,7 @@ storageVolLookupByPathCallback(virStoragePoolObj *obj,
- 
-         case VIR_STORAGE_POOL_GLUSTER:
-         case VIR_STORAGE_POOL_RBD:
-+        case VIR_STORAGE_POOL_VITASTOR:
-         case VIR_STORAGE_POOL_SHEEPDOG:
-         case VIR_STORAGE_POOL_ZFS:
-         case VIR_STORAGE_POOL_LAST:
-diff --git a/src/storage_file/storage_source_backingstore.c b/src/storage_file/storage_source_backingstore.c
-index 80681924ea..8a3ade9ec0 100644
--- a/src/storage_file/storage_source_backingstore.c
-+++ b/src/storage_file/storage_source_backingstore.c
-@@ -287,6 +287,75 @@ virStorageSourceParseRBDColonString(const char *rbdstr,
- }
- 
- 
-+static int
-+virStorageSourceParseVitastorColonString(const char *colonstr,
-+                                         virStorageSource *src)
-+{
-+    char *p, *e, *next;
-+    g_autofree char *options = NULL;
-+
-+    /* optionally skip the "vitastor:" prefix if provided */
-+    if (STRPREFIX(colonstr, "vitastor:"))
-+        colonstr += strlen("vitastor:");
-+
-+    options = g_strdup(colonstr);
-+
-+    p = options;
-+    while (*p) {
-+        /* find : delimiter or end of string */
-+        for (e = p; *e && *e != ':'; ++e) {
-+            if (*e == '\\') {
-+                e++;
-+                if (*e == '\0')
-+                    break;
-+            }
-+        }
-+        if (*e == '\0') {
-+            next = e;    /* last kv pair */
-+        } else {
-+            next = e + 1;
-+            *e = '\0';
-+        }
-+
-+        if (STRPREFIX(p, "image=")) {
-+            src->path = g_strdup(p + strlen("image="));
-+        } else if (STRPREFIX(p, "etcd-prefix=")) {
-+            src->query = g_strdup(p + strlen("etcd-prefix="));
-+        } else if (STRPREFIX(p, "config-path=")) {
-+            src->configFile = g_strdup(p + strlen("config-path="));
-+        } else if (STRPREFIX(p, "etcd-host=")) {
-+            char *h, *sep;
-+
-+            h = p + strlen("etcd-host=");
-+            while (h < e) {
-+                for (sep = h; sep < e; ++sep) {
-+                    if (*sep == '\\' && (sep[1] == ',' ||
-+                                         sep[1] == ';' ||
-+                                         sep[1] == ' ')) {
-+                        *sep = '\0';
-+                        sep += 2;
-+                        break;
-+                    }
-+                }
-+
-+                if (virStorageSourceRBDAddHost(src, h) < 0)
-+                    return -1;
-+
-+                h = sep;
-+            }
-+        }
-+
-+        p = next;
-+    }
-+
-+    if (!src->path) {
-+        return -1;
-+    }
-+
-+    return 0;
-+}
-+
-+
- static int
- virStorageSourceParseNBDColonString(const char *nbdstr,
-                                     virStorageSource *src)
-@@ -399,6 +468,11 @@ virStorageSourceParseBackingColon(virStorageSource *src,
-             return -1;
-         break;
- 
-+    case VIR_STORAGE_NET_PROTOCOL_VITASTOR:
-+        if (virStorageSourceParseVitastorColonString(path, src) < 0)
-+            return -1;
-+        break;
-+
-     case VIR_STORAGE_NET_PROTOCOL_SHEEPDOG:
-     case VIR_STORAGE_NET_PROTOCOL_LAST:
-     case VIR_STORAGE_NET_PROTOCOL_NONE:
-@@ -975,6 +1049,54 @@ virStorageSourceParseBackingJSONRBD(virStorageSource *src,
-     return 0;
- }
- 
-+static int
-+virStorageSourceParseBackingJSONVitastor(virStorageSource *src,
-+                                         virJSONValue *json,
-+                                         const char *jsonstr G_GNUC_UNUSED,
-+                                         int opaque G_GNUC_UNUSED)
-+{
-+    const char *filename;
-+    const char *image = virJSONValueObjectGetString(json, "image");
-+    const char *conf = virJSONValueObjectGetString(json, "config-path");
-+    const char *etcd_prefix = virJSONValueObjectGetString(json, "etcd-prefix");
-+    virJSONValue *servers = virJSONValueObjectGetArray(json, "server");
-+    size_t nservers;
-+    size_t i;
-+
-+    src->type = VIR_STORAGE_TYPE_NETWORK;
-+    src->protocol = VIR_STORAGE_NET_PROTOCOL_VITASTOR;
-+
-+    /* legacy syntax passed via 'filename' option */
-+    if ((filename = virJSONValueObjectGetString(json, "filename")))
-+        return virStorageSourceParseVitastorColonString(filename, src);
-+
-+    if (!image) {
-+        virReportError(VIR_ERR_INVALID_ARG, "%s",
-+                       _("missing image name in Vitastor backing volume "
-+                         "JSON specification"));
-+        return -1;
-+    }
-+
-+    src->path = g_strdup(image);
-+    src->configFile = g_strdup(conf);
-+    src->query = g_strdup(etcd_prefix);
-+
-+    if (servers) {
-+        nservers = virJSONValueArraySize(servers);
-+
-+        src->hosts = g_new0(virStorageNetHostDef, nservers);
-+        src->nhosts = nservers;
-+
-+        for (i = 0; i < nservers; i++) {
-+            if (virStorageSourceParseBackingJSONInetSocketAddress(src->hosts + i,
-+                                                                  virJSONValueArrayGet(servers, i)) < 0)
-+                return -1;
-+        }
-+    }
-+
-+    return 0;
-+}
-+
- static int
- virStorageSourceParseBackingJSONRaw(virStorageSource *src,
-                                     virJSONValue *json,
-@@ -1152,6 +1274,7 @@ static const struct virStorageSourceJSONDriverParser jsonParsers[] = {
-     {"sheepdog", false, virStorageSourceParseBackingJSONSheepdog, 0},
-     {"ssh", false, virStorageSourceParseBackingJSONSSH, 0},
-     {"rbd", false, virStorageSourceParseBackingJSONRBD, 0},
-+    {"vitastor", false, virStorageSourceParseBackingJSONVitastor, 0},
-     {"raw", true, virStorageSourceParseBackingJSONRaw, 0},
-     {"nfs", false, virStorageSourceParseBackingJSONNFS, 0},
-     {"vxhs", false, virStorageSourceParseBackingJSONVxHS, 0},
-diff --git a/src/test/test_driver.c b/src/test/test_driver.c
-index 25335d9002..cf54069fbe 100644
--- a/src/test/test_driver.c
-+++ b/src/test/test_driver.c
-@@ -7340,6 +7340,7 @@ testStorageVolumeTypeForPool(int pooltype)
-     case VIR_STORAGE_POOL_ISCSI_DIRECT:
-     case VIR_STORAGE_POOL_GLUSTER:
-     case VIR_STORAGE_POOL_RBD:
-+    case VIR_STORAGE_POOL_VITASTOR:
-         return VIR_STORAGE_VOL_NETWORK;
-     case VIR_STORAGE_POOL_LOGICAL:
-     case VIR_STORAGE_POOL_DISK:
-diff --git a/tests/storagepoolcapsschemadata/poolcaps-fs.xml b/tests/storagepoolcapsschemadata/poolcaps-fs.xml
-index eee75af746..8bd0a57bdd 100644
--- a/tests/storagepoolcapsschemadata/poolcaps-fs.xml
-+++ b/tests/storagepoolcapsschemadata/poolcaps-fs.xml
-@@ -204,4 +204,11 @@
-       </enum>
-     </volOptions>
-   </pool>
-+  <pool type='vitastor' supported='no'>
-+    <volOptions>
-+      <defaultFormat type='raw'/>
-+      <enum name='targetFormatType'>
-+      </enum>
-+    </volOptions>
-+  </pool>
- </storagepoolCapabilities>
-diff --git a/tests/storagepoolcapsschemadata/poolcaps-full.xml b/tests/storagepoolcapsschemadata/poolcaps-full.xml
-index 805950a937..852df0de16 100644
--- a/tests/storagepoolcapsschemadata/poolcaps-full.xml
-+++ b/tests/storagepoolcapsschemadata/poolcaps-full.xml
-@@ -204,4 +204,11 @@
-       </enum>
-     </volOptions>
-   </pool>
-+  <pool type='vitastor' supported='yes'>
-+    <volOptions>
-+      <defaultFormat type='raw'/>
-+      <enum name='targetFormatType'>
-+      </enum>
-+    </volOptions>
-+  </pool>
- </storagepoolCapabilities>
-diff --git a/tests/storagepoolxml2argvtest.c b/tests/storagepoolxml2argvtest.c
-index d5c2531ab8..b19308ac38 100644
--- a/tests/storagepoolxml2argvtest.c
-+++ b/tests/storagepoolxml2argvtest.c
-@@ -57,6 +57,7 @@ testCompareXMLToArgvFiles(bool shouldFail,
-     case VIR_STORAGE_POOL_GLUSTER:
-     case VIR_STORAGE_POOL_ZFS:
-     case VIR_STORAGE_POOL_VSTORAGE:
-+    case VIR_STORAGE_POOL_VITASTOR:
-     case VIR_STORAGE_POOL_LAST:
-     default:
-         VIR_TEST_DEBUG("pool type '%s' has no xml2argv test", defTypeStr);
-diff --git a/tools/virsh-pool.c b/tools/virsh-pool.c
-index 2010ef1356..072e2ff9e8 100644
--- a/tools/virsh-pool.c
-+++ b/tools/virsh-pool.c
-@@ -1187,6 +1187,9 @@ cmdPoolList(vshControl *ctl, const vshCmd *cmd G_GNUC_UNUSED)
-             case VIR_STORAGE_POOL_VSTORAGE:
-                 flags |= VIR_CONNECT_LIST_STORAGE_POOLS_VSTORAGE;
-                 break;
-+            case VIR_STORAGE_POOL_VITASTOR:
-+                flags |= VIR_CONNECT_LIST_STORAGE_POOLS_VITASTOR;
-+                break;
-             case VIR_STORAGE_POOL_LAST:
-                 break;
-             }
@@ -1,172 +0,0 @@
-Index: pve-qemu-kvm-10.0.2/block/meson.build
-===================================================================
--- pve-qemu-kvm-10.0.2.orig/block/meson.build
-+++ pve-qemu-kvm-10.0.2/block/meson.build
-@@ -126,6 +126,7 @@ foreach m : [
-   [libnfs, 'nfs', files('nfs.c')],
-   [libssh, 'ssh', files('ssh.c')],
-   [rbd, 'rbd', files('rbd.c')],
-+  [vitastor, 'vitastor', files('vitastor.c')],
- ]
-   if m[0].found()
-     module_ss = ss.source_set()
-Index: pve-qemu-kvm-10.0.2/meson.build
-===================================================================
--- pve-qemu-kvm-10.0.2.orig/meson.build
-+++ pve-qemu-kvm-10.0.2/meson.build
-@@ -1622,6 +1622,26 @@ if not get_option('rbd').auto() or have_
-   endif
- endif
- 
-+vitastor = not_found
-+if not get_option('vitastor').auto() or have_block
-+  libvitastor_client = cc.find_library('vitastor_client', has_headers: ['vitastor_c.h'],
-+    required: get_option('vitastor'))
-+  if libvitastor_client.found()
-+    if cc.links('''
-+      #include <vitastor_c.h>
-+      int main(void) {
-+        vitastor_c_create_qemu(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
-+        return 0;
-+      }''', dependencies: libvitastor_client)
-+      vitastor = declare_dependency(dependencies: libvitastor_client)
-+    elif get_option('vitastor').enabled()
-+      error('could not link libvitastor_client')
-+    else
-+      warning('could not link libvitastor_client, disabling')
-+    endif
-+  endif
-+endif
-+
- glusterfs = not_found
- glusterfs_ftruncate_has_stat = false
- glusterfs_iocb_has_stat = false
-@@ -2514,6 +2534,7 @@ endif
- config_host_data.set('CONFIG_OPENGL', opengl.found())
- config_host_data.set('CONFIG_PLUGIN', get_option('plugins'))
- config_host_data.set('CONFIG_RBD', rbd.found())
-+config_host_data.set('CONFIG_VITASTOR', vitastor.found())
- config_host_data.set('CONFIG_RDMA', rdma.found())
- config_host_data.set('CONFIG_RELOCATABLE', get_option('relocatable'))
- config_host_data.set('CONFIG_SAFESTACK', get_option('safe_stack'))
-@@ -4812,6 +4833,7 @@ summary_info += {'fdt support':       fd
- summary_info += {'libcap-ng support': libcap_ng}
- summary_info += {'bpf support':       libbpf}
- summary_info += {'rbd support':       rbd}
-+summary_info += {'vitastor support':  vitastor}
- summary_info += {'smartcard support': cacard}
- summary_info += {'U2F support':       u2f}
- summary_info += {'libusb':            libusb}
-Index: pve-qemu-kvm-10.0.2/meson_options.txt
-===================================================================
--- pve-qemu-kvm-10.0.2.orig/meson_options.txt
-+++ pve-qemu-kvm-10.0.2/meson_options.txt
-@@ -202,6 +202,8 @@ option('pvg', type: 'feature', value: 'a
-        description: 'macOS paravirtualized graphics support')
- option('rbd', type : 'feature', value : 'auto',
-        description: 'Ceph block device driver')
-+option('vitastor', type : 'feature', value : 'auto',
-+       description: 'Vitastor block device driver')
- option('opengl', type : 'feature', value : 'auto',
-        description: 'OpenGL support')
- option('rdma', type : 'feature', value : 'auto',
-Index: pve-qemu-kvm-10.0.2/qapi/block-core.json
-===================================================================
--- pve-qemu-kvm-10.0.2.orig/qapi/block-core.json
-+++ pve-qemu-kvm-10.0.2/qapi/block-core.json
-@@ -3599,7 +3599,7 @@
-             'raw', 'rbd',
-             { 'name': 'replication', 'if': 'CONFIG_REPLICATION' },
-             'pbs',
-            'ssh', 'throttle', 'vdi', 'vhdx',
-+            'ssh', 'throttle', 'vdi', 'vhdx', 'vitastor',
-             { 'name': 'virtio-blk-vfio-pci', 'if': 'CONFIG_BLKIO' },
-             { 'name': 'virtio-blk-vhost-user', 'if': 'CONFIG_BLKIO' },
-             { 'name': 'virtio-blk-vhost-vdpa', 'if': 'CONFIG_BLKIO' },
-@@ -4725,6 +4725,28 @@
-             '*server': ['InetSocketAddressBase'] } }
- 
- ##
-+# @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.
-@@ -5194,6 +5216,7 @@
-       'throttle':   'BlockdevOptionsThrottle',
-       'vdi':        'BlockdevOptionsGenericFormat',
-       'vhdx':       'BlockdevOptionsGenericFormat',
-+      'vitastor':   'BlockdevOptionsVitastor',
-       'virtio-blk-vfio-pci':
-                     { 'type': 'BlockdevOptionsVirtioBlkVfioPci',
-                       'if': 'CONFIG_BLKIO' },
-@@ -5674,6 +5697,20 @@
-             '*encrypt' :        'RbdEncryptionCreateOptions' } }
- 
- ##
-+# @BlockdevCreateOptionsVitastor:
-+#
-+# Driver specific image creation options for Vitastor.
-+#
-+# @location: Where to store the new image file.  This location cannot
-+#     point to a snapshot.
-+#
-+# @size: Size of the virtual disk in bytes
-+##
-+{ 'struct': 'BlockdevCreateOptionsVitastor',
-+  'data': { 'location':         'BlockdevOptionsVitastor',
-+            'size':             'size' } }
-+
-+##
- # @BlockdevVmdkSubformat:
- #
- # Subformat options for VMDK images
-@@ -5895,6 +5932,7 @@
-       'ssh':            'BlockdevCreateOptionsSsh',
-       'vdi':            'BlockdevCreateOptionsVdi',
-       'vhdx':           'BlockdevCreateOptionsVhdx',
-+      'vitastor':       'BlockdevCreateOptionsVitastor',
-       'vmdk':           'BlockdevCreateOptionsVmdk',
-       'vpc':            'BlockdevCreateOptionsVpc'
-   } }
-Index: pve-qemu-kvm-10.0.2/scripts/meson-buildoptions.sh
-===================================================================
--- pve-qemu-kvm-10.0.2.orig/scripts/meson-buildoptions.sh
-+++ pve-qemu-kvm-10.0.2/scripts/meson-buildoptions.sh
-@@ -175,6 +175,7 @@ meson_options_help() {
-   printf "%s\n" '  qga-vss         build QGA VSS support (broken with MinGW)'
-   printf "%s\n" '  qpl             Query Processing Library support'
-   printf "%s\n" '  rbd             Ceph block device driver'
-+  printf "%s\n" '  vitastor        Vitastor block device driver'
-   printf "%s\n" '  rdma            Enable RDMA-based migration'
-   printf "%s\n" '  replication     replication support'
-   printf "%s\n" '  rust            Rust support'
-@@ -458,6 +459,8 @@ _meson_option_parse() {
-     --disable-qpl) printf "%s" -Dqpl=disabled ;;
-     --enable-rbd) printf "%s" -Drbd=enabled ;;
-     --disable-rbd) printf "%s" -Drbd=disabled ;;
-+    --enable-vitastor) printf "%s" -Dvitastor=enabled ;;
-+    --disable-vitastor) printf "%s" -Dvitastor=disabled ;;
-     --enable-rdma) printf "%s" -Drdma=enabled ;;
-     --disable-rdma) printf "%s" -Drdma=disabled ;;
-     --enable-relocatable) printf "%s" -Drelocatable=true ;;
@@ -1,172 +0,0 @@
-Index: pve-qemu-kvm-10.1.2/block/meson.build
-===================================================================
--- pve-qemu-kvm-10.1.2.orig/block/meson.build
-+++ pve-qemu-kvm-10.1.2/block/meson.build
-@@ -126,6 +126,7 @@ foreach m : [
-   [libnfs, 'nfs', files('nfs.c')],
-   [libssh, 'ssh', files('ssh.c')],
-   [rbd, 'rbd', files('rbd.c')],
-+  [vitastor, 'vitastor', files('vitastor.c')],
- ]
-   if m[0].found()
-     module_ss = ss.source_set()
-Index: pve-qemu-kvm-10.1.2/meson.build
-===================================================================
--- pve-qemu-kvm-10.1.2.orig/meson.build
-+++ pve-qemu-kvm-10.1.2/meson.build
-@@ -1653,6 +1653,26 @@ if not get_option('rbd').auto() or have_
-   endif
- endif
- 
-+vitastor = not_found
-+if not get_option('vitastor').auto() or have_block
-+  libvitastor_client = cc.find_library('vitastor_client', has_headers: ['vitastor_c.h'],
-+    required: get_option('vitastor'))
-+  if libvitastor_client.found()
-+    if cc.links('''
-+      #include <vitastor_c.h>
-+      int main(void) {
-+        vitastor_c_create_qemu(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
-+        return 0;
-+      }''', dependencies: libvitastor_client)
-+      vitastor = declare_dependency(dependencies: libvitastor_client)
-+    elif get_option('vitastor').enabled()
-+      error('could not link libvitastor_client')
-+    else
-+      warning('could not link libvitastor_client, disabling')
-+    endif
-+  endif
-+endif
-+
- glusterfs = not_found
- glusterfs_ftruncate_has_stat = false
- glusterfs_iocb_has_stat = false
-@@ -2552,6 +2572,7 @@ endif
- config_host_data.set('CONFIG_OPENGL', opengl.found())
- config_host_data.set('CONFIG_PLUGIN', get_option('plugins'))
- config_host_data.set('CONFIG_RBD', rbd.found())
-+config_host_data.set('CONFIG_VITASTOR', vitastor.found())
- config_host_data.set('CONFIG_RDMA', rdma.found())
- config_host_data.set('CONFIG_RELOCATABLE', get_option('relocatable'))
- config_host_data.set('CONFIG_SAFESTACK', get_option('safe_stack'))
-@@ -4984,6 +5005,7 @@ summary_info += {'fdt support':       fd
- summary_info += {'libcap-ng support': libcap_ng}
- summary_info += {'bpf support':       libbpf}
- summary_info += {'rbd support':       rbd}
-+summary_info += {'vitastor support':  vitastor}
- summary_info += {'smartcard support': cacard}
- summary_info += {'U2F support':       u2f}
- summary_info += {'libusb':            libusb}
-Index: pve-qemu-kvm-10.1.2/meson_options.txt
-===================================================================
--- pve-qemu-kvm-10.1.2.orig/meson_options.txt
-+++ pve-qemu-kvm-10.1.2/meson_options.txt
-@@ -202,6 +202,8 @@ option('pvg', type: 'feature', value: 'a
-        description: 'macOS paravirtualized graphics support')
- option('rbd', type : 'feature', value : 'auto',
-        description: 'Ceph block device driver')
-+option('vitastor', type : 'feature', value : 'auto',
-+       description: 'Vitastor block device driver')
- option('opengl', type : 'feature', value : 'auto',
-        description: 'OpenGL support')
- option('rdma', type : 'feature', value : 'auto',
-Index: pve-qemu-kvm-10.1.2/qapi/block-core.json
-===================================================================
--- pve-qemu-kvm-10.1.2.orig/qapi/block-core.json
-+++ pve-qemu-kvm-10.1.2/qapi/block-core.json
-@@ -3647,7 +3647,7 @@
-             'raw', 'rbd',
-             { 'name': 'replication', 'if': 'CONFIG_REPLICATION' },
-             'pbs',
-            'ssh', 'throttle', 'vdi', 'vhdx',
-+            'ssh', 'throttle', 'vdi', 'vhdx', 'vitastor',
-             { 'name': 'virtio-blk-vfio-pci', 'if': 'CONFIG_BLKIO' },
-             { 'name': 'virtio-blk-vhost-user', 'if': 'CONFIG_BLKIO' },
-             { 'name': 'virtio-blk-vhost-vdpa', 'if': 'CONFIG_BLKIO' },
-@@ -4773,6 +4773,28 @@
-             '*server': ['InetSocketAddressBase'] } }
- 
- ##
-+# @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.
-@@ -5242,6 +5264,7 @@
-       'throttle':   'BlockdevOptionsThrottle',
-       'vdi':        'BlockdevOptionsGenericFormat',
-       'vhdx':       'BlockdevOptionsGenericFormat',
-+      'vitastor':   'BlockdevOptionsVitastor',
-       'virtio-blk-vfio-pci':
-                     { 'type': 'BlockdevOptionsVirtioBlkVfioPci',
-                       'if': 'CONFIG_BLKIO' },
-@@ -5722,6 +5745,20 @@
-             '*encrypt' :        'RbdEncryptionCreateOptions' } }
- 
- ##
-+# @BlockdevCreateOptionsVitastor:
-+#
-+# Driver specific image creation options for Vitastor.
-+#
-+# @location: Where to store the new image file.  This location cannot
-+#     point to a snapshot.
-+#
-+# @size: Size of the virtual disk in bytes
-+##
-+{ 'struct': 'BlockdevCreateOptionsVitastor',
-+  'data': { 'location':         'BlockdevOptionsVitastor',
-+            'size':             'size' } }
-+
-+##
- # @BlockdevVmdkSubformat:
- #
- # Subformat options for VMDK images
-@@ -5943,6 +5980,7 @@
-       'ssh':            'BlockdevCreateOptionsSsh',
-       'vdi':            'BlockdevCreateOptionsVdi',
-       'vhdx':           'BlockdevCreateOptionsVhdx',
-+      'vitastor':       'BlockdevCreateOptionsVitastor',
-       'vmdk':           'BlockdevCreateOptionsVmdk',
-       'vpc':            'BlockdevCreateOptionsVpc'
-   } }
-Index: pve-qemu-kvm-10.1.2/scripts/meson-buildoptions.sh
-===================================================================
--- pve-qemu-kvm-10.1.2.orig/scripts/meson-buildoptions.sh
-+++ pve-qemu-kvm-10.1.2/scripts/meson-buildoptions.sh
-@@ -175,6 +175,7 @@ meson_options_help() {
-   printf "%s\n" '  qga-vss         build QGA VSS support (broken with MinGW)'
-   printf "%s\n" '  qpl             Query Processing Library support'
-   printf "%s\n" '  rbd             Ceph block device driver'
-+  printf "%s\n" '  vitastor        Vitastor block device driver'
-   printf "%s\n" '  rdma            Enable RDMA-based migration'
-   printf "%s\n" '  replication     replication support'
-   printf "%s\n" '  rust            Rust support'
-@@ -459,6 +460,8 @@ _meson_option_parse() {
-     --disable-qpl) printf "%s" -Dqpl=disabled ;;
-     --enable-rbd) printf "%s" -Drbd=enabled ;;
-     --disable-rbd) printf "%s" -Drbd=disabled ;;
-+    --enable-vitastor) printf "%s" -Dvitastor=enabled ;;
-+    --disable-vitastor) printf "%s" -Dvitastor=disabled ;;
-     --enable-rdma) printf "%s" -Drdma=enabled ;;
-     --disable-rdma) printf "%s" -Drdma=disabled ;;
-     --enable-relocatable) printf "%s" -Drelocatable=true ;;
@@ -1,172 +0,0 @@
-diff --git a/block/meson.build b/block/meson.build
-index 34b1b2a306..24ca0f1e52 100644
--- a/block/meson.build
-+++ b/block/meson.build
-@@ -114,6 +114,7 @@ foreach m : [
-   [libnfs, 'nfs', files('nfs.c')],
-   [libssh, 'ssh', files('ssh.c')],
-   [rbd, 'rbd', files('rbd.c')],
-+  [vitastor, 'vitastor', files('vitastor.c')],
- ]
-   if m[0].found()
-     module_ss = ss.source_set()
-diff --git a/meson.build b/meson.build
-index 41f68d3806..29eaed9ba4 100644
--- a/meson.build
-+++ b/meson.build
-@@ -1622,6 +1622,26 @@ if not get_option('rbd').auto() or have_block
-   endif
- endif
- 
-+vitastor = not_found
-+if not get_option('vitastor').auto() or have_block
-+  libvitastor_client = cc.find_library('vitastor_client', has_headers: ['vitastor_c.h'],
-+    required: get_option('vitastor'))
-+  if libvitastor_client.found()
-+    if cc.links('''
-+      #include <vitastor_c.h>
-+      int main(void) {
-+        vitastor_c_create_qemu(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
-+        return 0;
-+      }''', dependencies: libvitastor_client)
-+      vitastor = declare_dependency(dependencies: libvitastor_client)
-+    elif get_option('vitastor').enabled()
-+      error('could not link libvitastor_client')
-+    else
-+      warning('could not link libvitastor_client, disabling')
-+    endif
-+  endif
-+endif
-+
- glusterfs = not_found
- glusterfs_ftruncate_has_stat = false
- glusterfs_iocb_has_stat = false
-@@ -2506,6 +2526,7 @@ endif
- config_host_data.set('CONFIG_OPENGL', opengl.found())
- config_host_data.set('CONFIG_PLUGIN', get_option('plugins'))
- config_host_data.set('CONFIG_RBD', rbd.found())
-+config_host_data.set('CONFIG_VITASTOR', vitastor.found())
- config_host_data.set('CONFIG_RDMA', rdma.found())
- config_host_data.set('CONFIG_RELOCATABLE', get_option('relocatable'))
- config_host_data.set('CONFIG_SAFESTACK', get_option('safe_stack'))
-@@ -4813,6 +4834,7 @@ summary_info += {'fdt support':       fdt_opt == 'internal' ? 'internal' : fdt}
- summary_info += {'libcap-ng support': libcap_ng}
- summary_info += {'bpf support':       libbpf}
- summary_info += {'rbd support':       rbd}
-+summary_info += {'vitastor support':  vitastor}
- summary_info += {'smartcard support': cacard}
- summary_info += {'U2F support':       u2f}
- summary_info += {'libusb':            libusb}
-diff --git a/meson_options.txt b/meson_options.txt
-index 59d973bca0..a3e7123980 100644
--- a/meson_options.txt
-+++ b/meson_options.txt
-@@ -202,6 +202,8 @@ option('pvg', type: 'feature', value: 'auto',
-        description: 'macOS paravirtualized graphics support')
- option('rbd', type : 'feature', value : 'auto',
-        description: 'Ceph block device driver')
-+option('vitastor', type : 'feature', value : 'auto',
-+       description: 'Vitastor block device driver')
- option('opengl', type : 'feature', value : 'auto',
-        description: 'OpenGL support')
- option('rdma', type : 'feature', value : 'auto',
-diff --git a/qapi/block-core.json b/qapi/block-core.json
-index b1937780e1..a511193620 100644
--- a/qapi/block-core.json
-+++ b/qapi/block-core.json
-@@ -3216,7 +3216,7 @@
-             'parallels', 'preallocate', 'qcow', 'qcow2', 'qed', 'quorum',
-             'raw', 'rbd',
-             { 'name': 'replication', 'if': 'CONFIG_REPLICATION' },
-            'ssh', 'throttle', 'vdi', 'vhdx',
-+            'ssh', 'throttle', 'vdi', 'vhdx', 'vitastor',
-             { 'name': 'virtio-blk-vfio-pci', 'if': 'CONFIG_BLKIO' },
-             { 'name': 'virtio-blk-vhost-user', 'if': 'CONFIG_BLKIO' },
-             { 'name': 'virtio-blk-vhost-vdpa', 'if': 'CONFIG_BLKIO' },
-@@ -4299,6 +4299,28 @@
-             '*key-secret': 'str',
-             '*server': ['InetSocketAddressBase'] } }
- 
-+##
-+# @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:
- #
-@@ -4767,6 +4789,7 @@
-       'throttle':   'BlockdevOptionsThrottle',
-       'vdi':        'BlockdevOptionsGenericFormat',
-       'vhdx':       'BlockdevOptionsGenericFormat',
-+      'vitastor':   'BlockdevOptionsVitastor',
-       'virtio-blk-vfio-pci':
-                     { 'type': 'BlockdevOptionsVirtioBlkVfioPci',
-                       'if': 'CONFIG_BLKIO' },
-@@ -5240,6 +5263,20 @@
-             '*cluster-size' :   'size',
-             '*encrypt' :        'RbdEncryptionCreateOptions' } }
- 
-+##
-+# @BlockdevCreateOptionsVitastor:
-+#
-+# Driver specific image creation options for Vitastor.
-+#
-+# @location: Where to store the new image file.  This location cannot
-+#     point to a snapshot.
-+#
-+# @size: Size of the virtual disk in bytes
-+##
-+{ 'struct': 'BlockdevCreateOptionsVitastor',
-+  'data': { 'location':         'BlockdevOptionsVitastor',
-+            'size':             'size' } }
-+
- ##
- # @BlockdevVmdkSubformat:
- #
-@@ -5462,6 +5499,7 @@
-       'ssh':            'BlockdevCreateOptionsSsh',
-       'vdi':            'BlockdevCreateOptionsVdi',
-       'vhdx':           'BlockdevCreateOptionsVhdx',
-+      'vitastor':       'BlockdevCreateOptionsVitastor',
-       'vmdk':           'BlockdevCreateOptionsVmdk',
-       'vpc':            'BlockdevCreateOptionsVpc'
-   } }
-diff --git a/scripts/meson-buildoptions.sh b/scripts/meson-buildoptions.sh
-index 3e8e00852b..45aff3b6a9 100644
--- a/scripts/meson-buildoptions.sh
-+++ b/scripts/meson-buildoptions.sh
-@@ -175,6 +175,7 @@ meson_options_help() {
-   printf "%s\n" '  qga-vss         build QGA VSS support (broken with MinGW)'
-   printf "%s\n" '  qpl             Query Processing Library support'
-   printf "%s\n" '  rbd             Ceph block device driver'
-+  printf "%s\n" '  vitastor        Vitastor block device driver'
-   printf "%s\n" '  rdma            Enable RDMA-based migration'
-   printf "%s\n" '  replication     replication support'
-   printf "%s\n" '  rust            Rust support'
-@@ -458,6 +459,8 @@ _meson_option_parse() {
-     --disable-qpl) printf "%s" -Dqpl=disabled ;;
-     --enable-rbd) printf "%s" -Drbd=enabled ;;
-     --disable-rbd) printf "%s" -Drbd=disabled ;;
-+    --enable-vitastor) printf "%s" -Dvitastor=enabled ;;
-+    --disable-vitastor) printf "%s" -Dvitastor=disabled ;;
-     --enable-rdma) printf "%s" -Drdma=enabled ;;
-     --disable-rdma) printf "%s" -Drdma=disabled ;;
-     --enable-relocatable) printf "%s" -Drelocatable=true ;;
@@ -1,29 +0,0 @@
-diff --git a/src/client/qemu_driver.c b/src/client/qemu_driver.c
-index d8356dab..5f4cd50d 100644
--- a/src/client/qemu_driver.c
-+++ b/src/client/qemu_driver.c
-@@ -974,14 +974,21 @@ static void vitastor_co_read_bitmap_cb(void *opaque, long retval, uint8_t *bitma
- #endif
- }
- 
-static int coroutine_fn vitastor_co_block_status(
-    BlockDriverState *bs, bool want_zero, int64_t offset, int64_t bytes,
-    int64_t *pnum, int64_t *map, BlockDriverState **file)
-+static int coroutine_fn vitastor_co_block_status(BlockDriverState *bs,
-+#if QEMU_VERSION_MAJOR > 10 || QEMU_VERSION_MAJOR == 10 && QEMU_VERSION_MINOR >= 1
-+    unsigned int mode,
-+#else
-+    bool want_zero,
-+#endif
-+    int64_t offset, int64_t bytes, int64_t *pnum, int64_t *map, BlockDriverState **file)
- {
-     // Allocated => return BDRV_BLOCK_DATA|BDRV_BLOCK_OFFSET_VALID
-     // Not allocated => return 0
-     // Error => return -errno
-     // Set pnum to length of the extent, `*map` = `offset`, `*file` = `bs`
-+#if QEMU_VERSION_MAJOR > 10 || QEMU_VERSION_MAJOR == 10 && QEMU_VERSION_MINOR >= 1
-+    int want_zero = (mode == BDRV_WANT_PRECISE);
-+#endif
-     VitastorRPC task;
-     VitastorClient *client = bs->opaque;
-     uint64_t inode = client->watch ? vitastor_c_inode_get_num(client->watch) : client->inode;
@@ -7,24 +7,22 @@ set -e
 VITASTOR=$(dirname $0)
 VITASTOR=$(realpath "$VITASTOR/..")

-REL=$(rpm --eval '%dist')
-REL=${REL##.}
-if [ "$REL" = "el8" ]; then
+EL=$(rpm --eval '%dist')
+if [ "$EL" = ".el8" ]; then
    # CentOS 8
    . /opt/rh/gcc-toolset-9/enable
-elif [ "$REL" = "el7" ]; then
+elif [ "$EL" = ".el7" ]; then
    # CentOS 7
    . /opt/rh/devtoolset-9/enable
 fi
 cd ~/rpmbuild/SPECS
 rpmbuild -bp fio.spec
 cd $VITASTOR
-VER=$(grep ^Version: rpm/vitastor-$REL.spec | awk '{print $2}')
-rm -rf fio
+VER=$(grep ^Version: rpm/vitastor-el7.spec | awk '{print $2}')
 ln -s ~/rpmbuild/BUILD/fio*/ fio
 sh copy-fio-includes.sh
 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'/' $VITASTOR/rpm/vitastor-$REL.spec
-tar --transform "s#^#vitastor-$VER/#" --exclude 'rpm/*.rpm' -czf $VITASTOR/../vitastor-$VER.$REL.tar.gz $(ls | grep -v packages)
+perl -i -pe 's/(Requires:\s*fio)([^\n]+)?/$1 = '$FIO'/' $VITASTOR/rpm/vitastor-el$EL.spec
+tar --transform "s#^#vitastor-$VER/#" --exclude 'rpm/*.rpm' -czf $VITASTOR/../vitastor-$VER$(rpm --eval '%dist').tar.gz *
@@ -1,16 +0,0 @@
-#!/bin/bash
-
-set -e -x
-REL=$(rpm --eval '%dist')
-REL=${REL##.}
-cd /root/vitastor/rpm
-./build-tarball.sh
-VER=$(grep ^Version: vitastor-$REL.spec | awk '{print $2}')
-cp /root/vitastor-$VER.$REL.tar.gz ~/rpmbuild/SOURCES
-cp vitastor-$REL.spec ~/rpmbuild/SPECS/vitastor.spec
-cd ~/rpmbuild/SPECS/
-rpmbuild -ba vitastor.spec
-mkdir -p /root/vitastor/packages/vitastor-$REL
-rm -rf /root/vitastor/packages/vitastor-$REL/*
-cp ~/rpmbuild/RPMS/*/*vitastor* /root/vitastor/packages/vitastor-$REL/
-cp ~/rpmbuild/SRPMS/vitastor* /root/vitastor/packages/vitastor-$REL/
@@ -1,8 +1,5 @@
 # Build packages for CentOS 7 inside a container
-# cd ..
-# docker build -t vitastor-buildenv:el7 -f rpm/vitastor-el7.Dockerfile .
-# docker run -i --rm -v ./:/root/vitastor vitastor-buildenv:el7 /root/vitastor/rpm/vitastor-build.sh
-
+# cd ..; podman build -t vitastor-el7 -v `pwd`/packages:/root/packages -f rpm/vitastor-el7.Dockerfile .
 # localedef -i ru_RU -f UTF-8 ru_RU.UTF-8

 FROM centos:7
@@ -10,9 +7,7 @@ FROM centos:7
 WORKDIR /root

 RUN rm -f /etc/yum.repos.d/CentOS-Media.repo
-RUN sed -i 's/^mirrorlist=/#mirrorlist=/; s!#baseurl=http://mirror.centos.org/centos/\$releasever!baseurl=http://vault.centos.org/7.9.2009!' /etc/yum.repos.d/*.repo
 RUN yum -y --enablerepo=extras install centos-release-scl epel-release yum-utils rpm-build
-RUN perl -i -pe 's!mirrorlist=!#mirrorlist=!s; s!#\s*baseurl=http://mirror.centos.org!baseurl=http://vault.centos.org!' /etc/yum.repos.d/CentOS-SCLo-scl*.repo
 RUN yum -y install https://vitastor.io/rpms/centos/7/vitastor-release-1.0-1.el7.noarch.rpm
 RUN yum -y install devtoolset-9-gcc-c++ devtoolset-9-libatomic-devel gcc make cmake gperftools-devel \
    fio rh-nodejs12 jerasure-devel libisa-l-devel gf-complete-devel rdma-core-devel libnl3-devel
@@ -21,3 +16,32 @@ RUN rpm --nomd5 -i fio*.src.rpm
 RUN rm -f /etc/yum.repos.d/CentOS-Media.repo
 RUN cd ~/rpmbuild/SPECS && yum-builddep -y fio.spec
 RUN yum -y install cmake3
+
+ADD https://vitastor.io/rpms/liburing-el7/liburing-0.7-2.el7.src.rpm /root
+
+RUN set -e; \
+    rpm -i liburing*.src.rpm; \
+    cd ~/rpmbuild/SPECS/; \
+    . /opt/rh/devtoolset-9/enable; \
+    rpmbuild -ba liburing.spec; \
+    mkdir -p /root/packages/liburing-el7; \
+    rm -rf /root/packages/liburing-el7/*; \
+    cp ~/rpmbuild/RPMS/*/liburing* /root/packages/liburing-el7/; \
+    cp ~/rpmbuild/SRPMS/liburing* /root/packages/liburing-el7/
+
+RUN rpm -i `ls /root/packages/liburing-el7/liburing-*.x86_64.rpm | grep -v debug`
+
+ADD . /root/vitastor
+
+RUN set -e; \
+    cd /root/vitastor/rpm; \
+    sh build-tarball.sh; \
+    VER=$(grep ^Version: vitastor-el7.spec | awk '{print $2}'); \
+    cp /root/vitastor-$VER.el7.tar.gz ~/rpmbuild/SOURCES; \
+    cp vitastor-el7.spec ~/rpmbuild/SPECS/vitastor.spec; \
+    cd ~/rpmbuild/SPECS/; \
+    rpmbuild -ba vitastor.spec; \
+    mkdir -p /root/packages/vitastor-el7; \
+    rm -rf /root/packages/vitastor-el7/*; \
+    cp ~/rpmbuild/RPMS/*/*vitastor* /root/packages/vitastor-el7/; \
+    cp ~/rpmbuild/SRPMS/vitastor* /root/packages/vitastor-el7/
@@ -1,12 +1,13 @@
 Name:           vitastor
-Version:        2.4.3
+Version:        2.1.0
 Release:        1%{?dist}
 Summary:        Vitastor, a fast software-defined clustered block storage

 License:        Vitastor Network Public License 1.1
 URL:            https://vitastor.io/
-Source0:        vitastor-2.4.3.el7.tar.gz
+Source0:        vitastor-2.1.0.el7.tar.gz

+BuildRequires:  liburing-devel >= 0.6
 BuildRequires:  gperftools-devel
 BuildRequires:  devtoolset-9-gcc-c++
 BuildRequires:  rh-nodejs12
@@ -34,6 +35,8 @@ size with configurable redundancy (replication or erasure codes/XOR).
 Summary:        Vitastor - OSD
 Requires:       libJerasure2
 Requires:       libisa-l
+Requires:       liburing >= 0.6
+Requires:       liburing < 2
 Requires:       vitastor-client = %{version}-%{release}
 Requires:       util-linux
 Requires:       parted
@@ -57,6 +60,8 @@ scheduling cluster-level operations.

 %package -n vitastor-client
 Summary:        Vitastor - client
+Requires:       liburing >= 0.6
+Requires:       liburing < 2


 %description -n vitastor-client
@@ -77,7 +82,7 @@ Vitastor library headers for development.
 Summary:        Vitastor - fio drivers
 Group:          Development/Libraries
 Requires:       vitastor-client = %{version}-%{release}
-Requires:       fio = 3.7-2.el7
+Requires:       fio = 3.7-1.el7


 %description -n vitastor-fio
@@ -164,7 +169,6 @@ chown vitastor:vitastor /var/lib/vitastor

 %files -n vitastor-client
 %_bindir/vitastor-nbd
-%_bindir/vitastor-ublk
 %_bindir/vitastor-nfs
 %_bindir/vitastor-cli
 %_bindir/vitastor-rm
@@ -1,7 +1,5 @@
 # Build packages for CentOS 8 inside a container
-# cd ..
-# docker build -t vitastor-buildenv:el8 -f rpm/vitastor-el8.Dockerfile .
-# docker run -i --rm -v ./:/root/vitastor vitastor-buildenv:el8 /root/vitastor/rpm/vitastor-build.sh
+# cd ..; podman build -t vitastor-el8 -v `pwd`/packages:/root/packages -f rpm/vitastor-el8.Dockerfile .

 FROM centos:8

@@ -17,3 +15,32 @@ RUN dnf -y install gcc-toolset-9 gcc-toolset-9-gcc-c++ gperftools-devel \
 RUN dnf download --source fio
 RUN rpm --nomd5 -i fio*.src.rpm
 RUN cd ~/rpmbuild/SPECS && dnf builddep -y --enablerepo=powertools --spec fio.spec
+
+ADD https://vitastor.io/rpms/liburing-el7/liburing-0.7-2.el7.src.rpm /root
+
+RUN set -e; \
+    rpm -i liburing*.src.rpm; \
+    cd ~/rpmbuild/SPECS/; \
+    . /opt/rh/gcc-toolset-9/enable; \
+    rpmbuild -ba liburing.spec; \
+    mkdir -p /root/packages/liburing-el8; \
+    rm -rf /root/packages/liburing-el8/*; \
+    cp ~/rpmbuild/RPMS/*/liburing* /root/packages/liburing-el8/; \
+    cp ~/rpmbuild/SRPMS/liburing* /root/packages/liburing-el8/
+
+RUN rpm -i `ls /root/packages/liburing-el8/liburing-*.x86_64.rpm | grep -v debug`
+
+ADD . /root/vitastor
+
+RUN set -e; \
+    cd /root/vitastor/rpm; \
+    sh build-tarball.sh; \
+    VER=$(grep ^Version: vitastor-el8.spec | awk '{print $2}'); \
+    cp /root/vitastor-$VER.el8.tar.gz ~/rpmbuild/SOURCES; \
+    cp vitastor-el8.spec ~/rpmbuild/SPECS/vitastor.spec; \
+    cd ~/rpmbuild/SPECS/; \
+    rpmbuild -ba vitastor.spec; \
+    mkdir -p /root/packages/vitastor-el8; \
+    rm -rf /root/packages/vitastor-el8/*; \
+    cp ~/rpmbuild/RPMS/*/*vitastor* /root/packages/vitastor-el8/; \
+    cp ~/rpmbuild/SRPMS/vitastor* /root/packages/vitastor-el8/
@@ -1,12 +1,13 @@
 Name:           vitastor
-Version:        2.4.3
+Version:        2.1.0
 Release:        1%{?dist}
 Summary:        Vitastor, a fast software-defined clustered block storage

 License:        Vitastor Network Public License 1.1
 URL:            https://vitastor.io/
-Source0:        vitastor-2.4.3.el8.tar.gz
+Source0:        vitastor-2.1.0.el8.tar.gz

+BuildRequires:  liburing-devel >= 0.6
 BuildRequires:  gperftools-devel
 BuildRequires:  gcc-toolset-9-gcc-c++
 BuildRequires:  nodejs >= 10
@@ -33,6 +34,8 @@ size with configurable redundancy (replication or erasure codes/XOR).
 Summary:        Vitastor - OSD
 Requires:       libJerasure2
 Requires:       libisa-l
+Requires:       liburing >= 0.6
+Requires:       liburing < 2
 Requires:       vitastor-client = %{version}-%{release}
 Requires:       util-linux
 Requires:       parted
@@ -55,6 +58,8 @@ scheduling cluster-level operations.

 %package -n vitastor-client
 Summary:        Vitastor - client
+Requires:       liburing >= 0.6
+Requires:       liburing < 2


 %description -n vitastor-client
@@ -75,7 +80,7 @@ Vitastor library headers for development.
 Summary:        Vitastor - fio drivers
 Group:          Development/Libraries
 Requires:       vitastor-client = %{version}-%{release}
-Requires:       fio = 3.19-3.el8
+Requires:       fio = 3.7-3.el8


 %description -n vitastor-fio
@@ -161,7 +166,6 @@ chown vitastor:vitastor /var/lib/vitastor

 %files -n vitastor-client
 %_bindir/vitastor-nbd
-%_bindir/vitastor-ublk
 %_bindir/vitastor-nfs
 %_bindir/vitastor-cli
 %_bindir/vitastor-rm
@@ -1,7 +1,5 @@
 # Build packages for AlmaLinux 9 inside a container
-# cd ..
-# docker build -t vitastor-buildenv:el9 -f rpm/vitastor-el9.Dockerfile .
-# docker run -i --rm -v ./:/root/vitastor vitastor-buildenv:el9 /root/vitastor/rpm/vitastor-build.sh
+# cd ..; podman build -t vitastor-el9 -v `pwd`/packages:/root/packages -f rpm/vitastor-el9.Dockerfile .

 FROM almalinux:9

@@ -10,7 +8,22 @@ WORKDIR /root
 RUN sed -i 's/enabled=0/enabled=1/' /etc/yum.repos.d/*.repo
 RUN dnf -y install epel-release dnf-plugins-core
 RUN dnf -y install https://vitastor.io/rpms/centos/9/vitastor-release-1.0-1.el9.noarch.rpm
-RUN dnf -y install gcc-c++ gperftools-devel fio nodejs rpm-build jerasure-devel libisa-l-devel gf-complete-devel rdma-core-devel libarchive cmake libnl3-devel
+RUN dnf -y install gcc-c++ gperftools-devel fio nodejs rpm-build jerasure-devel libisa-l-devel gf-complete-devel rdma-core-devel libarchive liburing-devel cmake libnl3-devel
 RUN dnf download --source fio
 RUN rpm --nomd5 -i fio*.src.rpm
 RUN cd ~/rpmbuild/SPECS && dnf builddep -y --spec fio.spec
+
+ADD . /root/vitastor
+
+RUN set -e; \
+    cd /root/vitastor/rpm; \
+    sh build-tarball.sh; \
+    VER=$(grep ^Version: vitastor-el9.spec | awk '{print $2}'); \
+    cp /root/vitastor-$VER.el9.tar.gz ~/rpmbuild/SOURCES; \
+    cp vitastor-el9.spec ~/rpmbuild/SPECS/vitastor.spec; \
+    cd ~/rpmbuild/SPECS/; \
+    rpmbuild -ba vitastor.spec; \
+    mkdir -p /root/packages/vitastor-el9; \
+    rm -rf /root/packages/vitastor-el9/*; \
+    cp ~/rpmbuild/RPMS/*/*vitastor* /root/packages/vitastor-el9/; \
+    cp ~/rpmbuild/SRPMS/vitastor* /root/packages/vitastor-el9/
@@ -1,12 +1,13 @@
 Name:           vitastor
-Version:        2.4.3
+Version:        2.1.0
 Release:        1%{?dist}
 Summary:        Vitastor, a fast software-defined clustered block storage

 License:        Vitastor Network Public License 1.1
 URL:            https://vitastor.io/
-Source0:        vitastor-2.4.3.el9.tar.gz
+Source0:        vitastor-2.1.0.el9.tar.gz

+BuildRequires:  liburing-devel >= 0.6
 BuildRequires:  gperftools-devel
 BuildRequires:  gcc-c++
 BuildRequires:  nodejs >= 10
@@ -158,7 +159,6 @@ chown vitastor:vitastor /var/lib/vitastor

 %files -n vitastor-client
 %_bindir/vitastor-nbd
-%_bindir/vitastor-ublk
 %_bindir/vitastor-nfs
 %_bindir/vitastor-cli
 %_bindir/vitastor-rm
@@ -12,30 +12,20 @@ set(WITH_QEMU false CACHE BOOL "Build QEMU driver inside Vitastor source tree")
 set(WITH_FIO true CACHE BOOL "Build FIO driver")
 set(QEMU_PLUGINDIR qemu CACHE STRING "QEMU plugin directory suffix (qemu-kvm on RHEL)")
 set(WITH_ASAN false CACHE BOOL "Build with AddressSanitizer")
-set(WITH_SYSTEM_LIBURING false CACHE BOOL "Use system liburing")
 if("${CMAKE_INSTALL_PREFIX}" MATCHES "^/usr/local/?$")
 	if(EXISTS "/etc/debian_version")
 		set(CMAKE_INSTALL_LIBDIR "lib/${CMAKE_LIBRARY_ARCHITECTURE}")
 	endif()
 	set(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}")
 endif()
-set(ENABLE_COVERAGE false CACHE BOOL "Enable code coverage")

-add_definitions(-DVITASTOR_VERSION="2.4.3")
-add_definitions(-D_GNU_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Wall -Wno-sign-compare -Wno-comment -Wno-parentheses -Wno-pointer-arith -fdiagnostics-color=always -fno-omit-frame-pointer -fvisibility=hidden -I ${CMAKE_SOURCE_DIR}/src)
+add_definitions(-DVITASTOR_VERSION="2.1.0")
+add_definitions(-D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Wall -Wno-sign-compare -Wno-comment -Wno-parentheses -Wno-pointer-arith -fdiagnostics-color=always -fno-omit-frame-pointer -I ${CMAKE_SOURCE_DIR}/src)
 add_link_options(-fno-omit-frame-pointer)
 if (${WITH_ASAN})
 	add_definitions(-fsanitize=address)
 	add_link_options(-fsanitize=address -fno-omit-frame-pointer)
 endif (${WITH_ASAN})
-set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -fvisibility-inlines-hidden")
-set(CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL} -fvisibility-inlines-hidden")
-set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} -fvisibility-inlines-hidden")
-
-if (${ENABLE_COVERAGE})
-	add_definitions(-coverage)
-	add_link_options(-coverage)
-endif()

 set(CMAKE_BUILD_TYPE RelWithDebInfo)
 string(REGEX REPLACE "([\\/\\-]O)[^ \t\r\n]*" "\\13" CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}")
@@ -59,6 +49,7 @@ endmacro(install_symlink)
 check_include_file("linux/nbd-netlink.h" HAVE_NBD_NETLINK_H)

 find_package(PkgConfig)
+pkg_check_modules(LIBURING REQUIRED liburing)
 if (${WITH_QEMU})
 	pkg_check_modules(GLIB REQUIRED glib-2.0)
 endif (${WITH_QEMU})
@@ -75,14 +66,13 @@ if (RDMACM_LIBRARIES)
 	add_definitions(-DWITH_RDMACM)
 endif (RDMACM_LIBRARIES)

-if (${WITH_SYSTEM_LIBURING})
-	pkg_check_modules(LIBURING REQUIRED liburing>=2.10)
-	include_directories(${LIBURING_INCLUDE_DIRS})
-else()
-	include_directories(${CMAKE_SOURCE_DIR}/src/liburing/include)
-	add_subdirectory(liburing)
-	set(LIBURING_LIBRARIES uring)
-endif (${WITH_SYSTEM_LIBURING})
+add_custom_target(build_tests)
+add_custom_target(test
+	COMMAND
+	echo leak:tcmalloc > ${CMAKE_CURRENT_BINARY_DIR}/lsan-suppress.txt &&
+	env LSAN_OPTIONS=suppressions=${CMAKE_CURRENT_BINARY_DIR}/lsan-suppress.txt ${CMAKE_CTEST_COMMAND}
+)
+add_dependencies(test build_tests)

 include_directories(
 	../
@@ -96,6 +86,7 @@ include_directories(
 	${CMAKE_SOURCE_DIR}/src/test
 	${CMAKE_SOURCE_DIR}/src/util
 	/usr/include/jerasure
+	${LIBURING_INCLUDE_DIRS}
 	${IBVERBS_INCLUDE_DIRS}
 )

@@ -110,12 +101,12 @@ add_subdirectory(test)

 ### Install

-install(TARGETS vitastor-osd vitastor-disk vitastor-nbd vitastor-ublk vitastor-nfs vitastor-cli vitastor-kv vitastor-kv-stress RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+install(TARGETS vitastor-osd vitastor-disk vitastor-nbd vitastor-nfs vitastor-cli vitastor-kv vitastor-kv-stress RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
 install_symlink(vitastor-disk ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_BINDIR}/vitastor-dump-journal)
 install_symlink(vitastor-cli ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_BINDIR}/vitastor-rm)
 install_symlink(vitastor-cli ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_BINDIR}/vita)
 install(
-	TARGETS vitastor_client vitastor_kv
+	TARGETS vitastor_blk vitastor_client vitastor_kv
 	LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
 	PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
 )
@@ -2,18 +2,14 @@ cmake_minimum_required(VERSION 2.8.12)

 project(vitastor)

-# libvitastor_blk.a
-add_library(vitastor_blk STATIC
-	../util/allocator.cpp ../util/crc32c.c ../util/ringloop.cpp
-	multilist.cpp blockstore_heap.cpp blockstore_disk.cpp
-	blockstore.cpp blockstore_impl.cpp blockstore_init.cpp blockstore_open.cpp
-	blockstore_flush.cpp blockstore_read.cpp blockstore_stable.cpp blockstore_sync.cpp blockstore_write.cpp
-	v1/flush.cpp v1/impl.cpp v1/init.cpp v1/journal.cpp v1/open.cpp v1/read.cpp v1/rollback.cpp v1/stable.cpp v1/sync.cpp v1/write.cpp
+# libvitastor_blk.so
+add_library(vitastor_blk SHARED
+	../util/allocator.cpp blockstore.cpp blockstore_impl.cpp blockstore_disk.cpp blockstore_init.cpp blockstore_open.cpp blockstore_journal.cpp blockstore_read.cpp
+	blockstore_write.cpp blockstore_sync.cpp blockstore_stable.cpp blockstore_rollback.cpp blockstore_flush.cpp ../util/crc32c.c ../util/ringloop.cpp
 )
-target_compile_options(vitastor_blk PUBLIC -fPIC)
 target_link_libraries(vitastor_blk
 	${LIBURING_LIBRARIES}
-	${ISAL_LIBRARIES}
+	tcmalloc_minimal
 	# for timerfd_manager
 	vitastor_common
 )
@@ -1,16 +1,89 @@
 // Copyright (c) Vitaliy Filippov, 2019+
 // License: VNPL-1.1 (see README.md for details)

-#include "str_util.h"
-
 #include "blockstore_impl.h"
-#include "v1/impl.h"

-blockstore_i* blockstore_i::create(blockstore_config_t & config, ring_loop_i *ringloop, timerfd_manager_t *tfd)
+blockstore_t::blockstore_t(blockstore_config_t & config, ring_loop_t *ringloop, timerfd_manager_t *tfd)
 {
-    auto meta_format = stoull_full(config["meta_format"]);
-    if (meta_format == BLOCKSTORE_META_FORMAT_HEAP)
-        return new blockstore_impl_t(config, ringloop, tfd);
-    else
-        return new v1::blockstore_impl_t(config, ringloop, tfd);
+    impl = new blockstore_impl_t(config, ringloop, tfd);
+}
+
+blockstore_t::~blockstore_t()
+{
+    delete impl;
+}
+
+void blockstore_t::parse_config(blockstore_config_t & config)
+{
+    impl->parse_config(config, false);
+}
+
+void blockstore_t::loop()
+{
+    impl->loop();
+}
+
+bool blockstore_t::is_started()
+{
+    return impl->is_started();
+}
+
+bool blockstore_t::is_stalled()
+{
+    return impl->is_stalled();
+}
+
+bool blockstore_t::is_safe_to_stop()
+{
+    return impl->is_safe_to_stop();
+}
+
+void blockstore_t::enqueue_op(blockstore_op_t *op)
+{
+    impl->enqueue_op(op);
+}
+
+int blockstore_t::read_bitmap(object_id oid, uint64_t target_version, void *bitmap, uint64_t *result_version)
+{
+    return impl->read_bitmap(oid, target_version, bitmap, result_version);
+}
+
+std::map<uint64_t, uint64_t> & blockstore_t::get_inode_space_stats()
+{
+    return impl->inode_space_stats;
+}
+
+void blockstore_t::dump_diagnostics()
+{
+    return impl->dump_diagnostics();
+}
+
+uint32_t blockstore_t::get_block_size()
+{
+    return impl->get_block_size();
+}
+
+uint64_t blockstore_t::get_block_count()
+{
+    return impl->get_block_count();
+}
+
+uint64_t blockstore_t::get_free_block_count()
+{
+    return impl->get_free_block_count();
+}
+
+uint64_t blockstore_t::get_journal_size()
+{
+    return impl->get_journal_size();
+}
+
+uint32_t blockstore_t::get_bitmap_granularity()
+{
+    return impl->get_bitmap_granularity();
+}
+
+void blockstore_t::set_no_inode_stats(const std::vector<uint64_t> & pool_ids)
+{
+    impl->set_no_inode_stats(pool_ids);
 }
@@ -17,14 +17,22 @@
 #include "ringloop.h"
 #include "timerfd_manager.h"

+// Memory alignment for direct I/O (usually 512 bytes)
+#ifndef DIRECT_IO_ALIGNMENT
+#define DIRECT_IO_ALIGNMENT 512
+#endif
+
+// Memory allocation alignment (page size is usually optimal)
+#ifndef MEM_ALIGNMENT
+#define MEM_ALIGNMENT 4096
+#endif
+
 // Default block size is 128 KB, current allowed range is 4K - 128M
 #define DEFAULT_DATA_BLOCK_ORDER 17
 #define MIN_DATA_BLOCK_SIZE 4*1024
 #define MAX_DATA_BLOCK_SIZE 128*1024*1024
 #define DEFAULT_BITMAP_GRANULARITY 4096

-#define MIN_JOURNAL_SIZE 1024*1024
-
 #define BS_OP_MIN 1
 #define BS_OP_READ 1
 #define BS_OP_WRITE 2
@@ -34,22 +42,13 @@
 #define BS_OP_DELETE 6
 #define BS_OP_LIST 7
 #define BS_OP_ROLLBACK 8
-#define BS_OP_MAX 8
+#define BS_OP_SYNC_STAB_ALL 9
+#define BS_OP_MAX 9

 #define BS_OP_PRIVATE_DATA_SIZE 256

-#define IMMEDIATE_NONE 0
-#define IMMEDIATE_SMALL 1
-#define IMMEDIATE_ALL 2
-
 /*

-All operations may be submitted in any order, because reads only see completed writes,
-syncs only sync completed writes and writes don't depend on each other.
-
-The only restriction is that the external code MUST NOT submit multiple writes for one
-object in parallel. This is a natural restriction because `version` numbers are used though.
-
 Blockstore opcode documentation:

 ## BS_OP_READ / BS_OP_WRITE / BS_OP_WRITE_STABLE
@@ -114,6 +113,14 @@ Input:
 Output:
 - retval = 0 or negative error number (-ENOENT if no such version for stabilize)

+## BS_OP_SYNC_STAB_ALL
+
+ONLY FOR TESTS! Sync and mark all unstable object versions as stable, at once.
+
+Input: Nothing except opcode
+Output:
+- retval = 0 or negative error number (-EINVAL)
+
 ## BS_OP_LIST

 Get a list of all objects in this Blockstore.
@@ -137,10 +144,10 @@ Output:

 */

-struct __attribute__ ((visibility("default"))) blockstore_op_t
+struct blockstore_op_t
 {
    // operation
-    uint64_t opcode = 0;
+    uint64_t opcode;
    // finish callback
    std::function<void (blockstore_op_t*)> callback;
    union __attribute__((__packed__))
@@ -164,63 +171,62 @@ struct __attribute__ ((visibility("default"))) blockstore_op_t
            uint32_t list_stable_limit;
        };
    };
-    uint8_t *buf = NULL;
-    uint8_t *bitmap = NULL;
-    int retval = 0;
+    void *buf;
+    void *bitmap;
+    int retval;

    uint8_t private_data[BS_OP_PRIVATE_DATA_SIZE];
 };

 typedef std::map<std::string, std::string> blockstore_config_t;

-class __attribute__((visibility("default"))) blockstore_i
-{
-public:
-    static blockstore_i* create(blockstore_config_t & config, ring_loop_i *ringloop, timerfd_manager_t *tfd);
+class blockstore_impl_t;

-    virtual ~blockstore_i() = default;
+class blockstore_t
+{
+    blockstore_impl_t *impl;
+public:
+    blockstore_t(blockstore_config_t & config, ring_loop_t *ringloop, timerfd_manager_t *tfd);
+    ~blockstore_t();

    // Update configuration
-    virtual void parse_config(blockstore_config_t & config) = 0;
+    void parse_config(blockstore_config_t & config);

    // Event loop
-    virtual void loop() = 0;
+    void loop();

    // Returns true when blockstore is ready to process operations
    // (Although you're free to enqueue them before that)
-    virtual bool is_started() = 0;
+    bool is_started();

    // Returns true when blockstore is stalled
-    virtual bool is_stalled() = 0;
+    bool is_stalled();

    // Returns true when it's safe to destroy the instance. If destroying the instance
    // requires to purge some queues, starts that process. Should be called in the event
    // loop until it returns true.
-    virtual bool is_safe_to_stop() = 0;
+    bool is_safe_to_stop();

    // Submission
-    virtual void enqueue_op(blockstore_op_t *op) = 0;
+    void enqueue_op(blockstore_op_t *op);

    // Simplified synchronous operation: get object bitmap & current version
-    virtual int read_bitmap(object_id oid, uint64_t target_version, void *bitmap, uint64_t *result_version = NULL) = 0;
+    int read_bitmap(object_id oid, uint64_t target_version, void *bitmap, uint64_t *result_version = NULL);

    // Get per-inode space usage statistics
-    virtual const std::map<uint64_t, uint64_t> & get_inode_space_stats() = 0;
+    std::map<uint64_t, uint64_t> & get_inode_space_stats();

    // Set per-pool no_inode_stats
-    virtual void set_no_inode_stats(const std::vector<uint64_t> & pool_ids) = 0;
+    void set_no_inode_stats(const std::vector<uint64_t> & pool_ids);

    // Print diagnostics to stdout
-    virtual void dump_diagnostics() = 0;
+    void dump_diagnostics();

-    // Get diagnostic string for an operation
-    virtual std::string get_op_diag(blockstore_op_t *op) = 0;
+    uint32_t get_block_size();
+    uint64_t get_block_count();
+    uint64_t get_free_block_count();

-    virtual uint32_t get_block_size() = 0;
-    virtual uint64_t get_block_count() = 0;
-    virtual uint64_t get_free_block_count() = 0;
+    uint64_t get_journal_size();

-    virtual uint64_t get_journal_size() = 0;
-
-    virtual uint32_t get_bitmap_granularity() = 0;
+    uint32_t get_bitmap_granularity();
 };
@@ -2,15 +2,11 @@
 // License: VNPL-1.1 (see README.md for details)

 #include <sys/file.h>
-#include <sys/ioctl.h>
-#include <unistd.h>

 #include <stdexcept>

-#include "blockstore.h"
-#include "ondisk_formats.h"
+#include "blockstore_impl.h"
 #include "blockstore_disk.h"
-#include "blockstore_heap.h"
 #include "str_util.h"
 #include "allocator.h"

@@ -48,11 +44,8 @@ void blockstore_disk_t::parse_config(std::map<std::string, std::string> & config
    disk_alignment = parse_size(config["disk_alignment"]);
    journal_block_size = parse_size(config["journal_block_size"]);
    meta_block_size = parse_size(config["meta_block_size"]);
-    meta_block_target_free_space = parse_size(config["meta_block_target_free_space"]);
    bitmap_granularity = parse_size(config["bitmap_granularity"]);
    meta_format = stoull_full(config["meta_format"]);
-    atomic_write_size = (config.find("atomic_write_size") != config.end()
-        ? parse_size(config["atomic_write_size"]) : 4096);
    if (config.find("data_io") == config.end() &&
        config.find("meta_io") == config.end() &&
        config.find("journal_io") == config.end())
@@ -97,28 +90,12 @@ void blockstore_disk_t::parse_config(std::map<std::string, std::string> & config
    if (!min_discard_size)
        min_discard_size = 1024*1024;
    discard_granularity = parse_size(config["discard_granularity"]);
-    inmemory_meta = config["inmemory_metadata"] != "false" && config["inmemory_metadata"] != "0" &&
-        config["inmemory_metadata"] != "no";
-    inmemory_journal = config["inmemory_journal"] != "false" && config["inmemory_journal"] != "0" &&
-        config["inmemory_journal"] != "no";
-    disable_data_fsync = config["disable_data_fsync"] == "true" || config["disable_data_fsync"] == "1" || config["disable_data_fsync"] == "yes";
-    disable_meta_fsync = config["disable_meta_fsync"] == "true" || config["disable_meta_fsync"] == "1" || config["disable_meta_fsync"] == "yes";
-    disable_journal_fsync = config["disable_journal_fsync"] == "true" || config["disable_journal_fsync"] == "1" || config["disable_journal_fsync"] == "yes";
-    if (mock_mode)
-    {
-        data_device_size = parse_size(config["data_device_size"]);
-        data_device_sect = parse_size(config["data_device_sect"]);
-        meta_device_size = parse_size(config["meta_device_size"]);
-        meta_device_sect = parse_size(config["meta_device_sect"]);
-        journal_device_size = parse_size(config["journal_device_size"]);
-        journal_device_sect = parse_size(config["journal_device_sect"]);
-    }
    // Validate
    if (!data_block_size)
    {
        data_block_size = (1 << DEFAULT_DATA_BLOCK_ORDER);
    }
-    if (is_power_of_two(data_block_size) >= 64 || data_block_size < MIN_DATA_BLOCK_SIZE || data_block_size >= MAX_DATA_BLOCK_SIZE)
+    if ((block_order = is_power_of_two(data_block_size)) >= 64 || data_block_size < MIN_DATA_BLOCK_SIZE || data_block_size >= MAX_DATA_BLOCK_SIZE)
    {
        throw std::runtime_error("Bad block size");
    }
@@ -154,14 +131,6 @@ void blockstore_disk_t::parse_config(std::map<std::string, std::string> & config
    {
        throw std::runtime_error("meta_block_size must not exceed "+std::to_string(MAX_DATA_BLOCK_SIZE));
    }
-    if (!meta_block_target_free_space)
-    {
-        meta_block_target_free_space = 800;
-    }
-    if (meta_block_target_free_space >= meta_block_size)
-    {
-        throw std::runtime_error("meta_block_target_free_space must not exceed "+std::to_string(meta_block_size));
-    }
    if (data_offset % disk_alignment)
    {
        throw std::runtime_error("data_offset must be a multiple of disk_alignment = "+std::to_string(disk_alignment));
@@ -210,29 +179,17 @@ void blockstore_disk_t::parse_config(std::map<std::string, std::string> & config
    {
        throw std::runtime_error("journal_offset must be a multiple of journal_block_size = "+std::to_string(journal_block_size));
    }
-    if (!meta_format)
-    {
-        meta_format = BLOCKSTORE_META_FORMAT_HEAP;
-    }
-    if (meta_device == data_device)
-    {
-        disable_meta_fsync = disable_data_fsync;
-    }
-    if (journal_device == meta_device)
-    {
-        disable_journal_fsync = disable_meta_fsync;
-    }
 }

-void blockstore_disk_t::calc_lengths()
+void blockstore_disk_t::calc_lengths(bool skip_meta_check)
 {
    // data
    data_len = data_device_size - data_offset;
-    if (data_device == meta_device && data_offset < meta_offset)
+    if (data_fd == meta_fd && data_offset < meta_offset)
    {
        data_len = meta_offset - data_offset;
    }
-    if (data_device == journal_device && data_offset < journal_offset)
+    if (data_fd == journal_fd && data_offset < journal_offset)
    {
        data_len = data_len < journal_offset-data_offset
            ? data_len : journal_offset-data_offset;
@@ -247,23 +204,23 @@ void blockstore_disk_t::calc_lengths()
        data_len = cfg_data_size;
    }
    // meta
-    meta_area_size = (meta_device == data_device ? data_device_size : meta_device_size) - meta_offset;
-    if (meta_device == data_device && meta_offset <= data_offset)
+    uint64_t meta_area_size = (meta_fd == data_fd ? data_device_size : meta_device_size) - meta_offset;
+    if (meta_fd == data_fd && meta_offset <= data_offset)
    {
        meta_area_size = data_offset - meta_offset;
    }
-    if (meta_device == journal_device && meta_offset <= journal_offset)
+    if (meta_fd == journal_fd && meta_offset <= journal_offset)
    {
        meta_area_size = meta_area_size < journal_offset-meta_offset
            ? meta_area_size : journal_offset-meta_offset;
    }
    // journal
-    journal_len = (journal_device == data_device ? data_device_size : (journal_device == meta_device ? meta_device_size : journal_device_size)) - journal_offset;
-    if (journal_device == data_device && journal_offset <= data_offset)
+    journal_len = (journal_fd == data_fd ? data_device_size : (journal_fd == meta_fd ? meta_device_size : journal_device_size)) - journal_offset;
+    if (journal_fd == data_fd && journal_offset <= data_offset)
    {
        journal_len = data_offset - journal_offset;
    }
-    if (journal_device == meta_device && journal_offset <= meta_offset)
+    if (journal_fd == meta_fd && journal_offset <= meta_offset)
    {
        journal_len = journal_len < meta_offset-journal_offset
            ? journal_len : meta_offset-journal_offset;
@@ -273,37 +230,37 @@ void blockstore_disk_t::calc_lengths()
    clean_entry_bitmap_size = data_block_size / bitmap_granularity / 8;
    clean_dyn_size = clean_entry_bitmap_size*2 + (csum_block_size
        ? data_block_size/csum_block_size*(data_csum_type & 0xFF) : 0);
-    if (meta_format == BLOCKSTORE_META_FORMAT_HEAP)
+    clean_entry_size = sizeof(clean_disk_entry) + clean_dyn_size + 4 /*entry_csum*/;
+    meta_len = (1 + (block_count - 1 + meta_block_size / clean_entry_size) / (meta_block_size / clean_entry_size)) * meta_block_size;
+    bool new_doesnt_fit = (!meta_format && !skip_meta_check && meta_area_size < meta_len && !data_csum_type);
+    if (meta_format == BLOCKSTORE_META_FORMAT_V1 || new_doesnt_fit)
    {
-        uint32_t entries_per_block = ((meta_block_size-meta_block_target_free_space) /
-            (sizeof(heap_object_t) + sizeof(heap_write_t) + clean_dyn_size));
-        min_meta_len = (block_count+entries_per_block-1) / entries_per_block * meta_block_size;
-    }
-    else if (meta_format == BLOCKSTORE_META_FORMAT_V1)
-    {
-        clean_entry_size = 24 /*sizeof(clean_disk_entry)*/ + 2*clean_entry_bitmap_size;
-        min_meta_len = (1 + (block_count - 1 + meta_block_size / clean_entry_size)
-            / (meta_block_size / clean_entry_size)) * meta_block_size;
-    }
-    else if (meta_format == BLOCKSTORE_META_FORMAT_V2)
-    {
-        clean_entry_size = 24 /*sizeof(clean_disk_entry)*/ + clean_dyn_size + 4 /*entry_csum*/;
-        min_meta_len = (1 + (block_count - 1 + meta_block_size / clean_entry_size) / (meta_block_size / clean_entry_size)) * meta_block_size;
+        uint64_t clean_entry_v0_size = sizeof(clean_disk_entry) + 2*clean_entry_bitmap_size;
+        uint64_t meta_v0_len = (1 + (block_count - 1 + meta_block_size / clean_entry_v0_size)
+            / (meta_block_size / clean_entry_v0_size)) * meta_block_size;
+        if (meta_format == BLOCKSTORE_META_FORMAT_V1 || meta_area_size >= meta_v0_len)
+        {
+            // Old metadata fits.
+            if (new_doesnt_fit)
+            {
+                printf("Warning: Using old metadata format without checksums because the new format"
+                    " doesn't fit into provided area (%ju bytes required, %ju bytes available)\n", meta_len, meta_area_size);
+            }
+            clean_entry_size = clean_entry_v0_size;
+            meta_len = meta_v0_len;
+            meta_format = BLOCKSTORE_META_FORMAT_V1;
+        }
+        else
+            meta_format = BLOCKSTORE_META_FORMAT_V2;
    }
    else
+        meta_format = BLOCKSTORE_META_FORMAT_V2;
+    if (!skip_meta_check && meta_area_size < meta_len)
    {
-        throw std::runtime_error("meta_format = "+std::to_string(meta_format)+" is not supported");
-    }
-}
-
-void blockstore_disk_t::check_lengths()
-{
-    if (meta_area_size < min_meta_len)
-    {
-        throw std::runtime_error("Metadata area is too small, need at least "+std::to_string(min_meta_len)+" bytes, have only "+std::to_string(meta_area_size)+" bytes");
+        throw std::runtime_error("Metadata area is too small, need at least "+std::to_string(meta_len)+" bytes, have only "+std::to_string(meta_area_size)+" bytes");
    }
    // requested journal size
-    if (cfg_journal_size > journal_len)
+    if (!skip_meta_check && cfg_journal_size > journal_len)
    {
        throw std::runtime_error("Requested journal_size is too large");
    }
@@ -364,19 +321,12 @@ static int bs_openmode(const std::string & mode)

 void blockstore_disk_t::open_data()
 {
-    if (data_fd >= 0)
-    {
-        throw std::runtime_error("data device is already opened");
-    }
-    data_fd = mock_mode ? MOCK_DATA_FD : open(data_device.c_str(), bs_openmode(data_io) | O_RDWR);
+    data_fd = open(data_device.c_str(), bs_openmode(data_io) | O_RDWR);
    if (data_fd == -1)
    {
        throw std::runtime_error("Failed to open data device "+data_device+": "+std::string(strerror(errno)));
    }
-    if (!mock_mode)
-    {
-        check_size(data_fd, &data_device_size, &data_device_sect, "data device");
-    }
+    check_size(data_fd, &data_device_size, &data_device_sect, "data device");
    if (disk_alignment % data_device_sect)
    {
        throw std::runtime_error(
@@ -388,7 +338,7 @@ void blockstore_disk_t::open_data()
    {
        throw std::runtime_error("data_offset exceeds device size = "+std::to_string(data_device_size));
    }
-    if (!mock_mode && !disable_flock && flock(data_fd, LOCK_EX|LOCK_NB) != 0)
+    if (!disable_flock && flock(data_fd, LOCK_EX|LOCK_NB) != 0)
    {
        throw std::runtime_error(std::string("Failed to lock data device: ") + strerror(errno));
    }
@@ -396,26 +346,19 @@ void blockstore_disk_t::open_data()

 void blockstore_disk_t::open_meta()
 {
-    if (meta_fd >= 0)
-    {
-        throw std::runtime_error("metadata device is already opened");
-    }
    if (meta_device != data_device || meta_io != data_io)
    {
-        meta_fd = mock_mode ? MOCK_META_FD : open(meta_device.c_str(), bs_openmode(meta_io) | O_RDWR);
+        meta_fd = open(meta_device.c_str(), bs_openmode(meta_io) | O_RDWR);
        if (meta_fd == -1)
        {
            throw std::runtime_error("Failed to open metadata device "+meta_device+": "+std::string(strerror(errno)));
        }
-        if (!mock_mode)
-        {
-            check_size(meta_fd, &meta_device_size, &meta_device_sect, "metadata device");
-        }
+        check_size(meta_fd, &meta_device_size, &meta_device_sect, "metadata device");
        if (meta_offset >= meta_device_size)
        {
            throw std::runtime_error("meta_offset exceeds device size = "+std::to_string(meta_device_size));
        }
-        if (!mock_mode && !disable_flock && meta_device != data_device && flock(meta_fd, LOCK_EX|LOCK_NB) != 0)
+        if (!disable_flock && meta_device != data_device && flock(meta_fd, LOCK_EX|LOCK_NB) != 0)
        {
            throw std::runtime_error(std::string("Failed to lock metadata device: ") + strerror(errno));
        }
@@ -441,26 +384,15 @@ void blockstore_disk_t::open_meta()

 void blockstore_disk_t::open_journal()
 {
-    if (journal_fd >= 0)
-    {
-        throw std::runtime_error("journal device is already opened");
-    }
    if (journal_device != meta_device || journal_io != meta_io)
    {
-        journal_fd = mock_mode ? MOCK_JOURNAL_FD : open(journal_device.c_str(), bs_openmode(journal_io) | O_RDWR);
+        journal_fd = open(journal_device.c_str(), bs_openmode(journal_io) | O_RDWR);
        if (journal_fd == -1)
        {
            throw std::runtime_error("Failed to open journal device "+journal_device+": "+std::string(strerror(errno)));
        }
-        if (!mock_mode)
-        {
-            check_size(journal_fd, &journal_device_size, &journal_device_sect, "journal device");
-        }
-        if (journal_offset >= journal_device_size)
-        {
-            throw std::runtime_error("journal_offset exceeds device size = "+std::to_string(journal_device_size));
-        }
-        if (!mock_mode && !disable_flock && journal_device != meta_device && flock(journal_fd, LOCK_EX|LOCK_NB) != 0)
+        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)
        {
            throw std::runtime_error(std::string("Failed to lock journal device: ") + strerror(errno));
        }
@@ -486,32 +418,25 @@ void blockstore_disk_t::open_journal()

 void blockstore_disk_t::close_all()
 {
-    if (!mock_mode)
-    {
-        if (data_fd >= 0)
-            close(data_fd);
-        if (meta_fd >= 0 && meta_fd != data_fd)
-            close(meta_fd);
-        if (journal_fd >= 0 && journal_fd != meta_fd)
-            close(journal_fd);
-    }
+    if (data_fd >= 0)
+        close(data_fd);
+    if (meta_fd >= 0 && meta_fd != data_fd)
+        close(meta_fd);
+    if (journal_fd >= 0 && journal_fd != meta_fd)
+        close(journal_fd);
    data_fd = meta_fd = journal_fd = -1;
 }

 // Sadly DISCARD only works through ioctl(), but it seems to always block the device queue,
 // so it's not a big deal that we can only run it synchronously.
-int blockstore_disk_t::trim_data(std::function<bool(uint64_t)> is_free)
+int blockstore_disk_t::trim_data(allocator_t *alloc)
 {
-    if (mock_mode)
-    {
-        return -EINVAL;
-    }
    int r = 0;
    uint64_t j = 0, i = 0;
    uint64_t discarded = 0;
    for (; i <= block_count; i++)
    {
-        if (i >= block_count || is_free(i))
+        if (i >= block_count || alloc->get(i))
        {
            if (i > j && (i-j)*data_block_size >= min_discard_size)
            {
@@ -8,19 +8,10 @@
 #include <string>
 #include <map>

-// Memory alignment for direct I/O (usually 512 bytes)
-#ifndef DIRECT_IO_ALIGNMENT
-#define DIRECT_IO_ALIGNMENT 512
-#endif
-
 #define BLOCKSTORE_CSUM_NONE 0
 // Lower byte of checksum type is its length
 #define BLOCKSTORE_CSUM_CRC32C 0x104

-#define MOCK_DATA_FD 1000
-#define MOCK_META_FD 1001
-#define MOCK_JOURNAL_FD 1002
-
 class allocator_t;

 struct blockstore_disk_t
@@ -31,15 +22,11 @@ struct blockstore_disk_t
    // Required write alignment and journal/metadata/data areas' location alignment
    uint32_t disk_alignment = 4096;
    // Journal block size - minimum_io_size of the journal device is the best choice
-    uint32_t journal_block_size = 4096;
+    uint64_t journal_block_size = 4096;
    // Metadata block size - minimum_io_size of the metadata device is the best choice
-    uint32_t meta_block_size = 4096;
-    // Atomic write size of the data block device
-    uint32_t atomic_write_size = 4096;
-    // Target free space in metadata blocks
-    uint32_t meta_block_target_free_space = 800;
+    uint64_t meta_block_size = 4096;
    // Sparse write tracking granularity. 4 KB is a good choice. Must be a multiple of disk_alignment
-    uint32_t bitmap_granularity = 4096;
+    uint64_t bitmap_granularity = 4096;
    // Data checksum type, BLOCKSTORE_CSUM_NONE or BLOCKSTORE_CSUM_CRC32C
    uint32_t data_csum_type = BLOCKSTORE_CSUM_NONE;
    // Checksum block size, must be a multiple of bitmap_granularity
@@ -49,36 +36,27 @@ struct blockstore_disk_t
    // I/O modes for data, metadata and journal: direct or "" = O_DIRECT, cached = O_SYNC, directsync = O_DIRECT|O_SYNC
    // O_SYNC without O_DIRECT = use Linux page cache for reads and writes
    std::string data_io, meta_io, journal_io;
-    // It is safe to disable fsync() if drive write cache is writethrough
-    bool disable_data_fsync = false, disable_meta_fsync = false, disable_journal_fsync = false;
-    // Keep journal (buffered data) in memory?
-    bool inmemory_meta = true;
-    // Keep metadata in memory?
-    bool inmemory_journal = true;
    // Data discard granularity and minimum size (for the sake of performance)
    bool discard_on_start = false;
    uint64_t min_discard_size = 1024*1024;
    uint64_t discard_granularity = 0;

    int meta_fd = -1, data_fd = -1, journal_fd = -1;
-    uint64_t meta_offset, meta_device_sect, meta_device_size, meta_area_size, min_meta_len, meta_format = 0;
+    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;

+    uint32_t block_order = 0;
    uint64_t block_count = 0;
-    uint32_t clean_entry_bitmap_size = 0;
-    uint32_t clean_entry_size = 0, clean_dyn_size = 0; // for meta_v1/2
-
-    bool mock_mode = false;
+    uint32_t clean_entry_bitmap_size = 0, clean_entry_size = 0, clean_dyn_size = 0;

    void parse_config(std::map<std::string, std::string> & config);
    void open_data();
    void open_meta();
    void open_journal();
-    void calc_lengths();
-    void check_lengths();
+    void calc_lengths(bool skip_meta_check = false);
    void close_all();
-    int trim_data(std::function<bool(uint64_t)> is_free);
+    int trim_data(allocator_t *alloc);

    inline uint64_t dirty_dyn_size(uint64_t offset, uint64_t len)
    {
--- a/Show More
+++ b/Show More