Use 32-bit big write location (OK for up to 512 TB OSDs)

This is required to:
1) later inline the last "big_write" entry into the object to slightly reduce memory usage
2) eliminate an ugly hack where entry type is determined by its size
3) make the storage scheme extensible i.e. when adding new entry types

.gitea/workflows/buildenv.Dockerfile

@@ -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 \
-    liburing1 liburing-dev libgoogle-perftools-dev devscripts libjerasure-dev cmake libibverbs-dev libisal-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}'`

.gitea/workflows/test.yml

@@ -144,6 +144,24 @@ 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
@@ -396,6 +414,24 @@ 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
@@ -684,6 +720,24 @@ 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
@@ -774,6 +828,60 @@ 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
@@ -918,24 +1026,6 @@ 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

CMakeLists.txt

@@ -2,6 +2,19 @@ cmake_minimum_required(VERSION 2.8.12)
 
 project(vitastor)
 
-set(VITASTOR_VERSION "2.2.0")
+set(VITASTOR_VERSION "2.4.3")
 
+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)

README-ru.md

@@ -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 NBD и NFS, драйверы OpenStack, OpenNebula, Proxmox, Kubernetes.
+Vitastor поддерживает QEMU-драйвер, протоколы UBLK, 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).
@@ -64,8 +64,9 @@ Vitastor поддерживает QEMU-драйвер, протоколы NBD и
   - [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
-  - [NBD](docs/usage/nbd.ru.md) для монтирования ядром
-  - [QEMU и qemu-img](docs/usage/qemu.ru.md)
+  - [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)
   - [NFS](docs/usage/nfs.ru.md) кластерная файловая система и псевдо-ФС прокси
   - [Администрирование](docs/usage/admin.ru.md)
 - Производительность

README.md

@@ -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, NBD, NFS protocols, OpenStack, OpenNebula, Proxmox, Kubernetes drivers.
+Vitastor supports QEMU, UBLK, 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).
@@ -64,8 +64,9 @@ 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
-  - [NBD](docs/usage/nbd.en.md) for kernel mounts
-  - [QEMU and qemu-img](docs/usage/qemu.en.md)
+  - [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)
   - [NFS](docs/usage/nfs.en.md) clustered file system and pseudo-FS proxy
   - [Administration](docs/usage/admin.en.md)
 - Performance

csi/Dockerfile

@@ -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 && \
+    apt-get install -y vitastor-client ibverbs-providers && \
     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 && \

csi/Dockerfile.local

@@ -0,0 +1,49 @@
+# 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"]

csi/Makefile

@@ -1,4 +1,4 @@
-VITASTOR_VERSION ?= v2.2.0
+VITASTOR_VERSION ?= v2.4.3
 
 all: build push
 

csi/deploy/004-csi-nodeplugin.yaml

@@ -49,7 +49,7 @@ spec:
             capabilities:
               add: ["SYS_ADMIN"]
             allowPrivilegeEscalation: true
-          image: vitalif/vitastor-csi:v2.2.0
+          image: vitalif/vitastor-csi:v2.4.3
           args:
             - "--node=$(NODE_ID)"
             - "--endpoint=$(CSI_ENDPOINT)"

csi/deploy/007-csi-provisioner.yaml

@@ -121,7 +121,7 @@ spec:
             privileged: true
             capabilities:
               add: ["SYS_ADMIN"]
-          image: vitalif/vitastor-csi:v2.2.0
+          image: vitalif/vitastor-csi:v2.4.3
           args:
             - "--node=$(NODE_ID)"
             - "--endpoint=$(CSI_ENDPOINT)"

csi/src/config.go

@@ -5,7 +5,7 @@ package vitastor
 
 const (
     vitastorCSIDriverName    = "csi.vitastor.io"
-    vitastorCSIDriverVersion = "2.2.0"
+    vitastorCSIDriverVersion = "2.4.3"
 )
 
 // Config struct fills the parameters of request or user input

csi/src/nodeserver.go

@@ -33,7 +33,7 @@ import (
 type NodeServer struct
 {
     *Driver
-    useVduse        bool
+    method          MountMethod
     stateDir        string
     nfsStageDir     string
     mounter         mount.Interface
@@ -81,16 +81,23 @@ func NewNodeServer(driver *Driver) *NodeServer
     }
     ns := &NodeServer{
         Driver:      driver,
-        useVduse:    checkVduseSupport(),
+        method:      selectMountMethod(),
         stateDir:    stateDir,
         nfsStageDir: nfsStageDir,
         mounter:     mount.New(""),
         volumeLocks: make(map[string]bool),
     }
     ns.cond = sync.NewCond(&ns.mu)
-    if (ns.useVduse)
+    if (ns.method == MOUNT_VDUSE)
     {
         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)
         {
@@ -136,7 +143,14 @@ func (ns *NodeServer) restarter()
     for
     {
         <-ticker.C
-        ns.restoreVduseDaemons()
+        if (ns.method == MOUNT_VDUSE)
+        {
+            ns.restoreVduseDaemons()
+        }
+        else if (ns.method == MOUNT_UBLK)
+        {
+            ns.restoreUblkDaemons()
+        }
     }
 }
 
@@ -231,6 +245,78 @@ 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"
@@ -417,14 +503,18 @@ func (ns *NodeServer) NodeStageVolume(ctx context.Context, req *csi.NodeStageVol
     }
 
     var devicePath, vdpaId string
-    if (!ns.useVduse)
+    if (ns.method == MOUNT_UBLK)
     {
-        devicePath, err = mapNbd(volName, ctxVars, false)
+        devicePath, err = mapUblk(ns.stateDir, volName, ctxVars["configPath"], false, "")
     }
-    else
+    else if (ns.method == MOUNT_VDUSE)
     {
         devicePath, vdpaId, err = mapVduse(ns.stateDir, volName, ctxVars, false)
     }
+    else /* if (ns.method == MOUNT_NBD) */
+    {
+        devicePath, err = mapNbd(volName, ctxVars, false)
+    }
     if (err != nil)
     {
         return nil, err
@@ -439,7 +529,8 @@ func (ns *NodeServer) NodeStageVolume(ctx context.Context, req *csi.NodeStageVol
     else
     {
         // Check existing format
-        existingFormat, err := diskMounter.GetDiskFormat(devicePath)
+        var existingFormat string
+        existingFormat, err = diskMounter.GetDiskFormat(devicePath)
         if (err != nil)
         {
             klog.Errorf("failed to get disk format for path %s, error: %v", err)
@@ -495,10 +586,6 @@ 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)
@@ -512,14 +599,18 @@ func (ns *NodeServer) NodeStageVolume(ctx context.Context, req *csi.NodeStageVol
     return &csi.NodeStageVolumeResponse{}, nil
 
 unmap:
-    if (!ns.useVduse || len(devicePath) >= 8 && devicePath[0:8] == "/dev/nbd")
+    if (ns.method == MOUNT_UBLK)
     {
-        unmapNbd(devicePath)
+        unmapUblk(ns.stateDir, devicePath)
     }
-    else
+    else if (ns.method == MOUNT_VDUSE)
     {
         unmapVduseById(ns.stateDir, vdpaId)
     }
+    else /* if (ns.method == MOUNT_NBD) */
+    {
+        unmapNbd(devicePath)
+    }
     return nil, err
 }
 
@@ -545,7 +636,7 @@ func (ns *NodeServer) NodeUnstageVolume(ctx context.Context, req *csi.NodeUnstag
     defer ns.unlockVolume(ctxVars["configPath"]+":block:"+volName)
 
     targetPath := req.GetStagingTargetPath()
-    devicePath, _, err := mount.GetDeviceNameFromMount(ns.mounter, targetPath)
+    devicePath, err := GetDeviceNameFromMount(targetPath)
     if (err != nil)
     {
         if (os.IsNotExist(err))
@@ -582,14 +673,18 @@ func (ns *NodeServer) NodeUnstageVolume(ctx context.Context, req *csi.NodeUnstag
     // unmap device
     if (len(refList) == 0)
     {
-        if (!ns.useVduse)
+        if (ns.method == MOUNT_UBLK)
         {
-            unmapNbd(devicePath)
+            unmapUblk(ns.stateDir, devicePath)
         }
-        else
+        else if (ns.method == MOUNT_VDUSE)
         {
             unmapVduse(ns.stateDir, devicePath)
         }
+        else /* if (ns.method == MOUNT_NBD) */
+        {
+            unmapNbd(devicePath)
+        }
     }
 
     return &csi.NodeUnstageVolumeResponse{}, nil
@@ -897,7 +992,7 @@ func (ns *NodeServer) NodeUnpublishVolume(ctx context.Context, req *csi.NodeUnpu
     }
 
     targetPath := req.GetTargetPath()
-    devicePath, _, err := mount.GetDeviceNameFromMount(ns.mounter, targetPath)
+    devicePath, err := GetDeviceNameFromMount(targetPath)
     if (err != nil)
     {
         if (os.IsNotExist(err))

csi/src/utils.go

@@ -16,10 +16,20 @@ 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++
@@ -32,29 +42,26 @@ func Contains(list []string, s string) bool
     return false
 }
 
-func checkVduseSupport() bool
+func selectMountMethod() MountMethod
 {
+    // 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"}
     {
-        _, err := os.Stat("/sys/module/"+mod)
-        if (err != nil)
+        if (!checkModule(mod))
         {
-            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
-            }
+            vduse = false
+            break
         }
     }
     // Check that vdpa tool functions
@@ -69,18 +76,38 @@ func checkVduseSupport() bool
             vduse = false
         }
     }
-    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
+    if (vduse)
     {
         klog.Infof("VDUSE support enabled successfully")
+        return MOUNT_VDUSE
     }
-    return 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
 }
 
 func mapNbd(volName string, ctxVars map[string]string, readonly bool) (string, error)
@@ -217,6 +244,7 @@ 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,
@@ -309,6 +337,117 @@ 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, " "))
@@ -340,3 +479,43 @@ 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
+}

debian/build-vitastor-bookworm.sh

@@ -1,7 +1,4 @@
 #!/bin/bash
 
-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
+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

debian/build-vitastor-bullseye.sh

@@ -1,7 +1,4 @@
 #!/bin/bash
 
-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
+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

debian/build-vitastor-buster.sh

@@ -1,7 +1,4 @@
 #!/bin/bash
 
-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
+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

debian/build-vitastor-trixie.sh

@@ -0,0 +1,4 @@
+#!/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

debian/build-vitastor-ubuntu-jammy.sh

@@ -1,7 +1,5 @@
 #!/bin/bash
+# Ubuntu 22.04 Jammy Jellyfish
 
-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
+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

debian/build-vitastor-ubuntu-noble.sh

@@ -0,0 +1,5 @@
+#!/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

debian/build-vitastor-ubuntu-questing.sh

@@ -0,0 +1,5 @@
+#!/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

debian/changelog

@@ -1,4 +1,4 @@
-vitastor (2.2.0-1) unstable; urgency=medium
+vitastor (2.4.3-1) unstable; urgency=medium
 
   * Bugfixes
 

debian/control

@@ -2,9 +2,9 @@ Source: vitastor
 Section: admin
 Priority: optional
 Maintainer: Vitaliy Filippov <vitalif@yourcmc.ru>
-Build-Depends: debhelper, liburing-dev (>= 0.6), g++ (>= 8), libstdc++6 (>= 8),
+Build-Depends: debhelper, g++ (>= 8), libstdc++6 (>= 8),
   linux-libc-dev, libgoogle-perftools-dev, libjerasure-dev, libgf-complete-dev,
-  libibverbs-dev, libisal-dev, cmake, pkg-config, libnl-3-dev, libnl-genl-3-dev,
+  libibverbs-dev, librdmacm-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/

debian/patched-qemu.Dockerfile

@@ -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 liburing-dev libgoogle-perftools-dev devscripts
+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 build-dep qemu
 # To build a custom version
 #RUN cp /root/packages/qemu-orig/* /root

debian/vitastor-build.sh

@@ -0,0 +1,65 @@
+#!/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

debian/vitastor-buildenv.Dockerfile

@@ -0,0 +1,31 @@
+# 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

debian/vitastor-client.install

@@ -2,6 +2,7 @@ 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

debian/vitastor.Dockerfile

@@ -1,65 +0,0 @@
-# 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-*/

docker/Dockerfile

@@ -3,7 +3,7 @@
 FROM debian:bookworm
 
 ADD etc/apt /etc/apt/
-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
+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
 ADD sleep.sh /usr/bin/
 ADD install.sh /usr/bin/
 ADD scripts /opt/scripts/

docker/Makefile

@@ -1,4 +1,4 @@
-VITASTOR_VERSION ?= v2.2.0
+VITASTOR_VERSION ?= v2.4.3
 
 all: build push
 

docker/etc/apt/preferences

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

docker/etc/vitastor/docker.conf

@@ -4,7 +4,7 @@
 #
 
 # Desired Vitastor version
-VITASTOR_VERSION=v2.2.0
+VITASTOR_VERSION=v2.4.3
 
 # Additional arguments for all containers
 # For example, you may want to specify a custom logging driver here

docs/config/client.en.md

@@ -25,6 +25,9 @@ affect their interaction with the cluster.
 - [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
 
@@ -225,3 +228,28 @@ without destroying and recreating OSDs.
 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.

docs/config/client.ru.md

@@ -25,6 +25,9 @@
 - [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
 
@@ -230,3 +233,30 @@ RDMA и хотите повысить пиковую производитель
 [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.

docs/config/network.en.md

@@ -74,7 +74,7 @@ Consider `use_rdmacm` for such networks.
 ## use_rdmacm
 
 - Type: boolean
-- Default: true
+- Default: false
 
 Use an alternative implementation of RDMA through RDMA-CM (Connection
 Manager). Works with all RDMA networks: Infiniband, iWARP and

docs/config/network.ru.md

@@ -74,7 +74,7 @@ RDMA-устройства, но они не имеют соединения с
 ## use_rdmacm
 
 - Тип: булево (да/нет)
-- Значение по умолчанию: true
+- Значение по умолчанию: false
 
 Использовать альтернативную реализацию RDMA на основе RDMA-CM (Connection
 Manager). Работает со всеми типами RDMA-сетей: Infiniband, iWARP и

docs/config/osd.en.md

@@ -491,7 +491,7 @@ Can be used to slow down scrubbing if it affects user load too much.
 ## scrub_list_limit
 
 - Type: integer
-- Default: 1000
+- Default: 262144
 - Can be changed online: yes
 
 Number of objects to list in one listing operation during scrub.

docs/config/osd.ru.md

@@ -514,7 +514,7 @@ fsync небезопасным даже с режимом "directsync".
 ## scrub_list_limit
 
 - Тип: целое число
-- Значение по умолчанию: 1000
+- Значение по умолчанию: 262144
 - Можно менять на лету: да
 
 Размер загружаемых за одну операцию списков объектов в процессе фоновой

docs/config/src/client.yml

@@ -283,3 +283,36 @@
     [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.

docs/config/src/included.en.md

@@ -24,6 +24,8 @@
 
 {{../../installation/kubernetes.en.md}}
 
+{{../../installation/s3.en.md}}
+
 {{../../installation/source.en.md}}
 
 {{../../config.en.md|indent=1}}
@@ -54,6 +56,8 @@
 
 {{../../usage/fio.en.md}}
 
+{{../../usage/ublk.en.md}}
+
 {{../../usage/nbd.en.md}}
 
 {{../../usage/qemu.en.md}}

docs/config/src/included.ru.md

@@ -26,6 +26,8 @@
 
 {{../../installation/source.ru.md}}
 
+{{../../installation/s3.ru.md}}
+
 {{../../config.ru.md|indent=1}}
 
 {{../../config/common.ru.md|indent=2}}
@@ -54,6 +56,8 @@
 
 {{../../usage/fio.ru.md}}
 
+{{../../usage/ublk.ru.md}}
+
 {{../../usage/nbd.ru.md}}
 
 {{../../usage/qemu.ru.md}}

docs/config/src/network.yml

@@ -51,7 +51,7 @@
     Рассмотрите включение `use_rdmacm` для таких сетей.
 - name: use_rdmacm
   type: bool
-  default: true
+  default: false
   info: |
     Use an alternative implementation of RDMA through RDMA-CM (Connection
     Manager). Works with all RDMA networks: Infiniband, iWARP and

docs/config/src/osd.yml

@@ -566,7 +566,7 @@
     сильно влияет на пользовательскую нагрузку.
 - name: scrub_list_limit
   type: int
-  default: 1000
+  default: 262144
   online: true
   info: |
     Number of objects to list in one listing operation during scrub.

docs/installation/docker.en.md

@@ -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 vitastor:v2.2.0`
+   `docker pull vitalif/vitastor:v2.4.3`
 2. Install scripts to the host system: \
-   `docker run --rm -it -v /etc:/host-etc -v /usr/bin:/host-bin vitastor:v2.2.0 install.sh`
+   `docker run --rm -it -v /etc:/host-etc -v /usr/bin:/host-bin vitalif/vitastor:v2.4.3 install.sh`
 3. Reload udev rules: \
    `udevadm control --reload-rules`
 

docs/installation/docker.ru.md

@@ -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 vitastor:v2.2.0`
+   `docker pull vitalif/vitastor:v2.4.3`
 2. Установите скрипты в хост-систему командой: \
-   `docker run --rm -it -v /etc:/host-etc -v /usr/bin:/host-bin vitastor:v2.2.0 install.sh`
+   `docker run --rm -it -v /etc:/host-etc -v /usr/bin:/host-bin vitalif/vitastor:v2.4.3 install.sh`
 3. Перезагрузите правила udev: \
    `udevadm control --reload-rules`
 

docs/installation/openstack.en.md

@@ -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_etcd_prefix = /vitastor
 vitastor_config_path = /etc/vitastor/vitastor.conf
 vitastor_pool_id = 1
 image_upload_use_cinder_backend = True

docs/installation/openstack.ru.md

@@ -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_etcd_prefix = /vitastor
 vitastor_config_path = /etc/vitastor/vitastor.conf
 vitastor_pool_id = 1
 image_upload_use_cinder_backend = True

docs/installation/packages.en.md

@@ -11,12 +11,20 @@
 - 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 12 (Bookworm/Sid): `deb https://vitastor.io/debian bookworm main`
+  - Debian 13 (Trixie/Sid): `deb https://vitastor.io/debian trixie main`
+  - Debian 12 (Bookworm): `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
@@ -42,7 +50,6 @@
   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).

docs/installation/packages.ru.md

@@ -11,12 +11,20 @@
 - 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 12 (Bookworm/Sid): `deb https://vitastor.io/debian bookworm main`
+  - Debian 13 (Trixie/Sid): `deb https://vitastor.io/debian trixie main`
+  - Debian 12 (Bookworm): `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
@@ -41,7 +49,6 @@
 - 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).

docs/installation/proxmox.en.md

@@ -6,10 +6,10 @@
 
 # Proxmox VE
 
-To enable Vitastor support in Proxmox Virtual Environment (6.4-8.1 are supported):
+To enable Vitastor support in Proxmox Virtual Environment (6.4-8.x are supported):
 
 - Add the corresponding Vitastor Debian repository into sources.list on Proxmox hosts:
-  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
+  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
 - 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),

docs/installation/proxmox.ru.md

@@ -6,10 +6,10 @@
 
 # Proxmox VE
 
-Чтобы подключить Vitastor к Proxmox Virtual Environment (поддерживаются версии 6.4-8.1):
+Чтобы подключить Vitastor к Proxmox Virtual Environment (поддерживаются версии 6.4-8.x):
 
 - Добавьте соответствующий Debian-репозиторий Vitastor в sources.list на хостах Proxmox:
-  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
+  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
 - 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

docs/installation/source.en.md

@@ -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
-- liburing, jerasure headers and libraries
+- jerasure headers and libraries
 - ISA-L, libibverbs and librdmacm headers and libraries (optional)
 - tcmalloc (google-perftools-dev)
 

docs/installation/source.ru.md

@@ -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 liburing, jerasure
+- Заголовки и библиотеки jerasure
 - Опционально - заголовки и библиотеки ISA-L, libibverbs, librdmacm
 - tcmalloc (google-perftools-dev)
 

docs/intro/author.en.md

@@ -10,8 +10,17 @@ Copyright (c) Vitaliy Filippov (vitalif [at] yourcmc.ru), 2019+
 
 Join Vitastor Telegram Chat: https://t.me/vitastor
 
-All server-side code (OSD, Monitor and so on) is licensed under the terms of
-Vitastor Network Public License 1.1 (VNPL 1.1), a copyleft license based on
+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
 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
@@ -20,18 +29,83 @@ the terms of the same license, but also under the terms of any GPL-Compatible
 Free Software License, as listed by the Free Software Foundation.
 This is a stricter copyleft license than the Affero GPL.
 
-Please note that VNPL doesn't require you to open the code of proprietary
-software running inside a VM if it's not specially designed to be used with
-Vitastor.
+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.
 
 Basically, you can't use the software in a proprietary environment to provide
 its functionality to users without opensourcing all intermediary components
 standing between the user and Vitastor or purchasing a commercial license
 from the author 😀.
 
-Client libraries (cluster_client and so on) are dual-licensed under the same
-VNPL 1.1 and also GNU GPL 2.0 or later to allow for compatibility with GPLed
-software like QEMU and fio.
+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.
 
-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).
+## 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)

docs/intro/author.ru.md

@@ -12,6 +12,14 @@
 
 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,
@@ -29,9 +37,70 @@ 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.
 
-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.
+## Пояснение
 
-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).
+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)

docs/intro/features.en.md

@@ -52,7 +52,7 @@
 - Generic user-space client library
 - [Native QEMU driver](../usage/qemu.en.md)
 - [Loadable fio engine for benchmarks](../usage/fio.en.md)
-- [NBD proxy for kernel mounts](../usage/nbd.en.md)
+- [UBLK](../usage/ublk.en.md) and [NBD](../usage/nbd.en.md) servers for kernel mounts
 - [Simplified NFS proxy for file-based image access emulation (suitable for VMWare)](../usage/nfs.en.md#pseudo-fs)
 
 ## Roadmap

docs/intro/features.ru.md

@@ -54,7 +54,7 @@
 - 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)
-- [NBD-прокси для монтирования образов ядром](../usage/nbd.ru.md) ("блочное устройство в режиме пользователя")
+- [UBLK](../usage/ublk.ru.md) и [NBD](../usage/nbd.ru.md) серверы для монтирования образов ядром ("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

docs/usage/cli.en.md

@@ -100,12 +100,14 @@ 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:

docs/usage/cli.ru.md

@@ -102,12 +102,14 @@ 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:

docs/usage/disk.en.md

@@ -73,6 +73,8 @@ 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):

docs/usage/disk.ru.md

@@ -74,6 +74,8 @@ 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:

docs/usage/nfs.en.md

@@ -89,6 +89,8 @@ 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
@@ -258,4 +260,5 @@ 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                     |

docs/usage/nfs.ru.md

@@ -91,6 +91,8 @@ 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
@@ -270,4 +272,5 @@ 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                          |

docs/usage/qemu.en.md

@@ -130,23 +130,16 @@ 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 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
+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.
 - It doesn't have hung device problem - if the userspace process dies it can be restarted (!)
-  and block device will continue operation
-- It doesn't seem to have the device number limit
+  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).
 
-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   |
+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).
 
 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).
@@ -193,3 +186,12 @@ 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 :).

docs/usage/qemu.ru.md

@@ -132,24 +132,16 @@ 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.
 
-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
+Преимущества VDUSE:
 
-Пример сравнения производительности:
+- 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).
 
-|                          | 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   |
+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).
 
 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).
@@ -196,3 +188,12 @@ 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 :).

docs/usage/ublk.en.md

@@ -0,0 +1,116 @@
+[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}}
+```

docs/usage/ublk.ru.md

@@ -0,0 +1,121 @@
+[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}}
+```

mon/mon.js

@@ -96,6 +96,7 @@ class Mon
                     }
                     else
                     {
+                        res.setHeader('Content-Type', 'text/plain; version=0.0.4; charset=utf-8');
                         res.write(export_prometheus_metrics(this.state));
                     }
                 }

mon/osd_tree.js

@@ -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 > 0)
+        if (isNaN(reweight) || reweight < 0 || reweight > 1)
             reweight = 1;
         if (stat && stat.size && reweight && (state.osd.state[osd_num] || Number(stat.time) >= down_time ||
             osd_cfg && osd_cfg.noout))
@@ -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.bs_block_size && osd_stat.bs_block_size != block_size ||
+            if (osd_stat && (osd_stat.data_block_size && osd_stat.data_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'))

mon/package.json

@@ -1,6 +1,6 @@
 {
   "name": "vitastor-mon",
-  "version": "2.2.0",
+  "version": "2.4.3",
   "description": "Vitastor SDS monitor service",
   "main": "mon-main.js",
   "scripts": {
@@ -9,7 +9,7 @@
   "author": "Vitaliy Filippov",
   "license": "UNLICENSED",
   "dependencies": {
-    "antietcd": "^1.1.2",
+    "antietcd": "^1.1.3",
     "sprintf-js": "^1.1.2",
     "ws": "^7.2.5"
   },

mon/scripts/make-etcd

@@ -52,15 +52,16 @@ 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+)?(\/.*)?$/g, '').toLowerCase());
+        .map(s => (''+s).replace(/^https?:\/\/|(:\d+)?(\/.*)?$/g, '').replace(/^\[(.*)\]$/, '$1').toLowerCase());
     const num = select_local_etcd(etcds);
     if (num < 0)
     {
         console.log('No matching IPs in etcd_address from '+config_path);
         process.exit(0);
     }
+    const etcd_url = 'http://' + (etcds[num].indexOf(':') >= 0 ? '['+etcds[num]+']' : etcds[num]);
     const etcd_name = 'etcd'+etcds[num].replace(/[^0-9a-z_]/ig, '_');
-    const etcd_cluster = etcds.map(e => `etcd${e.replace(/[^0-9a-z_]/ig, '_')}=http://${e}:2380`).join(',');
+    const etcd_cluster = etcds.map(e => `etcd${e.replace(/[^0-9a-z_]/ig, '_')}=http://${e.indexOf(':') >= 0 ? '['+e+']' : e}:2380`).join(',');
     if (in_docker)
     {
         let etcd_conf = fs.readFileSync("/etc/vitastor/etcd.conf", { encoding: 'utf-8' });
@@ -83,8 +84,8 @@ Wants=network-online.target local-fs.target time-sync.target
 Restart=always
 Environment=GOGC=50
 ExecStart=etcd --name ${etcd_name} --data-dir /var/lib/etcd/vitastor \\
-    --snapshot-count 10000 --advertise-client-urls http://${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 \\
+    --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 \\
     --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

mon/stats.js

@@ -276,6 +276,10 @@ 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();

node-binding/package.json

@@ -1,6 +1,6 @@
 {
   "name": "vitastor",
-  "version": "2.2.0",
+  "version": "2.4.3",
   "description": "Low-level native bindings to Vitastor client library",
   "main": "index.js",
   "keywords": [

patches/VitastorPlugin.pm

@@ -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);
+    my $list = _process_list($scfg, $storeid, $full_list, 0);
     # Remove image and all its snapshots
     my $rm_names = {
         map { ($prefix.$_->{name} => 1) }
@@ -269,6 +269,10 @@ sub free_image
         @$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)
@@ -288,14 +292,15 @@ sub free_image
 
 sub _process_list
 {
-    my ($scfg, $storeid, $result) = @_;
+    my ($scfg, $storeid, $result, $skip_snapshot) = @_;
+    $skip_snapshot = 1 if !defined $skip_snapshot;
     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 $name =~ /@/;
+        next if $skip_snapshot && $name =~ /@/;
         my ($owner) = $name =~ /^(?:vm|base)-(\d+)-/s;
         next if !defined $owner;
         my $parent = !defined $el->{parent_name}
@@ -410,8 +415,8 @@ 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];
-    #return wantarray ? ($size, $format, $used, $parent, $st->ctime) : $size;
-    return $info->{size};
+    # (size, format, used, parent, ctime)
+    return wantarray ? ($info->{size}, $info->{format}, $info->{size}, $info->{parent}, 0) : $info->{size};
 }
 
 sub volume_resize
@@ -494,4 +499,55 @@ 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;

patches/cinder-vitastor.py

@@ -50,7 +50,7 @@ from cinder.volume import configuration
 from cinder.volume import driver
 from cinder.volume import volume_utils
 
-VITASTOR_VERSION = '2.2.0'
+VITASTOR_VERSION = '2.4.3'
 
 LOG = logging.getLogger(__name__)
 

patches/libvirt-11.5-vitastor.diff

@@ -0,0 +1,637 @@
+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;
+             }

patches/pve-qemu-10.0-vitastor.patch

@@ -0,0 +1,172 @@
+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 ;;

patches/pve-qemu-10.1-vitastor.patch

@@ -0,0 +1,172 @@
+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 ;;

patches/qemu-10.0-vitastor.patch

@@ -0,0 +1,172 @@
+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 ;;

patches/qemu-10.1-vitastor.patch

@@ -0,0 +1,29 @@
+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;

rpm/build-tarball.sh

@@ -7,22 +7,24 @@ set -e
 VITASTOR=$(dirname $0)
 VITASTOR=$(realpath "$VITASTOR/..")
 
-EL=$(rpm --eval '%dist')
-if [ "$EL" = ".el8" ]; then
+REL=$(rpm --eval '%dist')
+REL=${REL##.}
+if [ "$REL" = "el8" ]; then
     # CentOS 8
     . /opt/rh/gcc-toolset-9/enable
-elif [ "$EL" = ".el7" ]; then
+elif [ "$REL" = "el7" ]; then
     # CentOS 7
     . /opt/rh/devtoolset-9/enable
 fi
 cd ~/rpmbuild/SPECS
 rpmbuild -bp fio.spec
 cd $VITASTOR
-VER=$(grep ^Version: rpm/vitastor-el7.spec | awk '{print $2}')
+VER=$(grep ^Version: rpm/vitastor-$REL.spec | awk '{print $2}')
+rm -rf fio
 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'/' $VITASTOR/rpm/vitastor-el$EL.spec
-tar --transform "s#^#vitastor-$VER/#" --exclude 'rpm/*.rpm' -czf $VITASTOR/../vitastor-$VER$(rpm --eval '%dist').tar.gz *
+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)

rpm/vitastor-build.sh

@@ -0,0 +1,16 @@
+#!/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/

rpm/vitastor-el7.Dockerfile

@@ -1,5 +1,8 @@
 # Build packages for CentOS 7 inside a container
-# cd ..; podman build -t vitastor-el7 -v `pwd`/packages:/root/packages -f rpm/vitastor-el7.Dockerfile .
+# 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
+
 # localedef -i ru_RU -f UTF-8 ru_RU.UTF-8
 
 FROM centos:7
@@ -7,7 +10,9 @@ 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
@@ -16,32 +21,3 @@ 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/

rpm/vitastor-el7.spec

@@ -1,13 +1,12 @@
 Name:           vitastor
-Version:        2.2.0
+Version:        2.4.3
 Release:        1%{?dist}
 Summary:        Vitastor, a fast software-defined clustered block storage
 
 License:        Vitastor Network Public License 1.1
 URL:            https://vitastor.io/
-Source0:        vitastor-2.2.0.el7.tar.gz
+Source0:        vitastor-2.4.3.el7.tar.gz
 
-BuildRequires:  liburing-devel >= 0.6
 BuildRequires:  gperftools-devel
 BuildRequires:  devtoolset-9-gcc-c++
 BuildRequires:  rh-nodejs12
@@ -35,8 +34,6 @@ 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
@@ -60,8 +57,6 @@ scheduling cluster-level operations.
 
 %package -n vitastor-client
 Summary:        Vitastor - client
-Requires:       liburing >= 0.6
-Requires:       liburing < 2
 
 
 %description -n vitastor-client
@@ -82,7 +77,7 @@ Vitastor library headers for development.
 Summary:        Vitastor - fio drivers
 Group:          Development/Libraries
 Requires:       vitastor-client = %{version}-%{release}
-Requires:       fio = 3.7-1.el7
+Requires:       fio = 3.7-2.el7
 
 
 %description -n vitastor-fio
@@ -169,6 +164,7 @@ 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

rpm/vitastor-el8.Dockerfile

@@ -1,5 +1,7 @@
 # Build packages for CentOS 8 inside a container
-# cd ..; podman build -t vitastor-el8 -v `pwd`/packages:/root/packages -f rpm/vitastor-el8.Dockerfile .
+# 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
 
 FROM centos:8
 
@@ -15,32 +17,3 @@ 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/

rpm/vitastor-el8.spec

@@ -1,13 +1,12 @@
 Name:           vitastor
-Version:        2.2.0
+Version:        2.4.3
 Release:        1%{?dist}
 Summary:        Vitastor, a fast software-defined clustered block storage
 
 License:        Vitastor Network Public License 1.1
 URL:            https://vitastor.io/
-Source0:        vitastor-2.2.0.el8.tar.gz
+Source0:        vitastor-2.4.3.el8.tar.gz
 
-BuildRequires:  liburing-devel >= 0.6
 BuildRequires:  gperftools-devel
 BuildRequires:  gcc-toolset-9-gcc-c++
 BuildRequires:  nodejs >= 10
@@ -34,8 +33,6 @@ 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
@@ -58,8 +55,6 @@ scheduling cluster-level operations.
 
 %package -n vitastor-client
 Summary:        Vitastor - client
-Requires:       liburing >= 0.6
-Requires:       liburing < 2
 
 
 %description -n vitastor-client
@@ -80,7 +75,7 @@ Vitastor library headers for development.
 Summary:        Vitastor - fio drivers
 Group:          Development/Libraries
 Requires:       vitastor-client = %{version}-%{release}
-Requires:       fio = 3.7-3.el8
+Requires:       fio = 3.19-3.el8
 
 
 %description -n vitastor-fio
@@ -166,6 +161,7 @@ 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

rpm/vitastor-el9.Dockerfile

@@ -1,5 +1,7 @@
 # Build packages for AlmaLinux 9 inside a container
-# cd ..; podman build -t vitastor-el9 -v `pwd`/packages:/root/packages -f rpm/vitastor-el9.Dockerfile .
+# 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
 
 FROM almalinux:9
 
@@ -8,22 +10,7 @@ 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 liburing-devel 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 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/

rpm/vitastor-el9.spec

@@ -1,13 +1,12 @@
 Name:           vitastor
-Version:        2.2.0
+Version:        2.4.3
 Release:        1%{?dist}
 Summary:        Vitastor, a fast software-defined clustered block storage
 
 License:        Vitastor Network Public License 1.1
 URL:            https://vitastor.io/
-Source0:        vitastor-2.2.0.el9.tar.gz
+Source0:        vitastor-2.4.3.el9.tar.gz
 
-BuildRequires:  liburing-devel >= 0.6
 BuildRequires:  gperftools-devel
 BuildRequires:  gcc-c++
 BuildRequires:  nodejs >= 10
@@ -159,6 +158,7 @@ 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

src/CMakeLists.txt

@@ -12,20 +12,30 @@ 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="2.2.0")
-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_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 ${CMAKE_SOURCE_DIR}/src)
 add_link_options(-fno-omit-frame-pointer)
 if (${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}")
@@ -49,7 +59,6 @@ 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})
@@ -66,13 +75,14 @@ if (RDMACM_LIBRARIES)
 	add_definitions(-DWITH_RDMACM)
 endif (RDMACM_LIBRARIES)
 
-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 ${CMAKE_CTEST_COMMAND}
-)
-add_dependencies(test build_tests)
+if (${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})
 
 include_directories(
 	../
@@ -86,7 +96,6 @@ include_directories(
 	${CMAKE_SOURCE_DIR}/src/test
 	${CMAKE_SOURCE_DIR}/src/util
 	/usr/include/jerasure
-	${LIBURING_INCLUDE_DIRS}
 	${IBVERBS_INCLUDE_DIRS}
 )
 
@@ -101,12 +110,12 @@ add_subdirectory(test)
 
 ### Install
 
-install(TARGETS vitastor-osd vitastor-disk vitastor-nbd vitastor-nfs vitastor-cli vitastor-kv vitastor-kv-stress RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+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_symlink(vitastor-disk ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_BINDIR}/vitastor-dump-journal)
 install_symlink(vitastor-cli ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_BINDIR}/vitastor-rm)
 install_symlink(vitastor-cli ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_BINDIR}/vita)
 install(
-	TARGETS vitastor_blk vitastor_client vitastor_kv
+	TARGETS vitastor_client vitastor_kv
 	LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
 	PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
 )

src/blockstore/CMakeLists.txt

@@ -2,14 +2,18 @@ cmake_minimum_required(VERSION 2.8.12)
 
 project(vitastor)
 
-# 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
+# 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
 )
+target_compile_options(vitastor_blk PUBLIC -fPIC)
 target_link_libraries(vitastor_blk
 	${LIBURING_LIBRARIES}
-	tcmalloc_minimal
+	${ISAL_LIBRARIES}
 	# for timerfd_manager
 	vitastor_common
 )

src/blockstore/blockstore.cpp

@@ -1,89 +1,16 @@
 // 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_t::blockstore_t(blockstore_config_t & config, ring_loop_t *ringloop, timerfd_manager_t *tfd)
+blockstore_i* blockstore_i::create(blockstore_config_t & config, ring_loop_i *ringloop, timerfd_manager_t *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);
+    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);
 }

src/blockstore/blockstore.h

@@ -17,22 +17,14 @@
 #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
@@ -42,13 +34,22 @@
 #define BS_OP_DELETE 6
 #define BS_OP_LIST 7
 #define BS_OP_ROLLBACK 8
-#define BS_OP_SYNC_STAB_ALL 9
-#define BS_OP_MAX 9
+#define BS_OP_MAX 8
 
 #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
@@ -113,14 +114,6 @@ 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.
@@ -144,10 +137,10 @@ Output:
 
 */
 
-struct blockstore_op_t
+struct __attribute__ ((visibility("default"))) blockstore_op_t
 {
     // operation
-    uint64_t opcode;
+    uint64_t opcode = 0;
     // finish callback
     std::function<void (blockstore_op_t*)> callback;
     union __attribute__((__packed__))
@@ -171,62 +164,63 @@ struct blockstore_op_t
             uint32_t list_stable_limit;
         };
     };
-    void *buf;
-    void *bitmap;
-    int retval;
+    uint8_t *buf = NULL;
+    uint8_t *bitmap = NULL;
+    int retval = 0;
 
     uint8_t private_data[BS_OP_PRIVATE_DATA_SIZE];
 };
 
 typedef std::map<std::string, std::string> blockstore_config_t;
 
-class blockstore_impl_t;
-
-class blockstore_t
+class __attribute__((visibility("default"))) blockstore_i
 {
-    blockstore_impl_t *impl;
 public:
-    blockstore_t(blockstore_config_t & config, ring_loop_t *ringloop, timerfd_manager_t *tfd);
-    ~blockstore_t();
+    static blockstore_i* create(blockstore_config_t & config, ring_loop_i *ringloop, timerfd_manager_t *tfd);
+
+    virtual ~blockstore_i() = default;
 
     // Update configuration
-    void parse_config(blockstore_config_t & config);
+    virtual void parse_config(blockstore_config_t & config) = 0;
 
     // Event loop
-    void loop();
+    virtual void loop() = 0;
 
     // Returns true when blockstore is ready to process operations
     // (Although you're free to enqueue them before that)
-    bool is_started();
+    virtual bool is_started() = 0;
 
     // Returns true when blockstore is stalled
-    bool is_stalled();
+    virtual bool is_stalled() = 0;
 
     // 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.
-    bool is_safe_to_stop();
+    virtual bool is_safe_to_stop() = 0;
 
     // Submission
-    void enqueue_op(blockstore_op_t *op);
+    virtual void enqueue_op(blockstore_op_t *op) = 0;
 
     // Simplified synchronous operation: get object bitmap & current version
-    int read_bitmap(object_id oid, uint64_t target_version, void *bitmap, uint64_t *result_version = NULL);
+    virtual int read_bitmap(object_id oid, uint64_t target_version, void *bitmap, uint64_t *result_version = NULL) = 0;
 
     // Get per-inode space usage statistics
-    std::map<uint64_t, uint64_t> & get_inode_space_stats();
+    virtual const std::map<uint64_t, uint64_t> & get_inode_space_stats() = 0;
 
     // Set per-pool no_inode_stats
-    void set_no_inode_stats(const std::vector<uint64_t> & pool_ids);
+    virtual void set_no_inode_stats(const std::vector<uint64_t> & pool_ids) = 0;
 
     // Print diagnostics to stdout
-    void dump_diagnostics();
+    virtual void dump_diagnostics() = 0;
 
-    uint32_t get_block_size();
-    uint64_t get_block_count();
-    uint64_t get_free_block_count();
+    // Get diagnostic string for an operation
+    virtual std::string get_op_diag(blockstore_op_t *op) = 0;
 
-    uint64_t get_journal_size();
+    virtual uint32_t get_block_size() = 0;
+    virtual uint64_t get_block_count() = 0;
+    virtual uint64_t get_free_block_count() = 0;
 
-    uint32_t get_bitmap_granularity();
+    virtual uint64_t get_journal_size() = 0;
+
+    virtual uint32_t get_bitmap_granularity() = 0;
 };

src/blockstore/blockstore_disk.cpp

@@ -2,11 +2,15 @@
 // License: VNPL-1.1 (see README.md for details)
 
 #include <sys/file.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
 
 #include <stdexcept>
 
-#include "blockstore_impl.h"
+#include "blockstore.h"
+#include "ondisk_formats.h"
 #include "blockstore_disk.h"
+#include "blockstore_heap.h"
 #include "str_util.h"
 #include "allocator.h"
 
@@ -44,8 +48,11 @@ 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())
@@ -90,12 +97,28 @@ 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 ((block_order = is_power_of_two(data_block_size)) >= 64 || data_block_size < MIN_DATA_BLOCK_SIZE || data_block_size >= MAX_DATA_BLOCK_SIZE)
+    if (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");
     }
@@ -131,6 +154,14 @@ 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));
@@ -179,17 +210,29 @@ 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(bool skip_meta_check)
+void blockstore_disk_t::calc_lengths()
 {
     // data
     data_len = data_device_size - data_offset;
-    if (data_fd == meta_fd && data_offset < meta_offset)
+    if (data_device == meta_device && data_offset < meta_offset)
     {
         data_len = meta_offset - data_offset;
     }
-    if (data_fd == journal_fd && data_offset < journal_offset)
+    if (data_device == journal_device && data_offset < journal_offset)
     {
         data_len = data_len < journal_offset-data_offset
             ? data_len : journal_offset-data_offset;
@@ -204,23 +247,23 @@ void blockstore_disk_t::calc_lengths(bool skip_meta_check)
         data_len = cfg_data_size;
     }
     // meta
-    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 = (meta_device == data_device ? data_device_size : meta_device_size) - meta_offset;
+    if (meta_device == data_device && meta_offset <= data_offset)
     {
         meta_area_size = data_offset - meta_offset;
     }
-    if (meta_fd == journal_fd && meta_offset <= journal_offset)
+    if (meta_device == journal_device && 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_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 = (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 = data_offset - journal_offset;
     }
-    if (journal_fd == meta_fd && journal_offset <= meta_offset)
+    if (journal_device == meta_device && journal_offset <= meta_offset)
     {
         journal_len = journal_len < meta_offset-journal_offset
             ? journal_len : meta_offset-journal_offset;
@@ -230,37 +273,37 @@ void blockstore_disk_t::calc_lengths(bool skip_meta_check)
     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);
-    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)
+    if (meta_format == BLOCKSTORE_META_FORMAT_HEAP)
     {
-        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;
+        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;
     }
     else
-        meta_format = BLOCKSTORE_META_FORMAT_V2;
-    if (!skip_meta_check && meta_area_size < meta_len)
     {
-        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");
+        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");
     }
     // requested journal size
-    if (!skip_meta_check && cfg_journal_size > journal_len)
+    if (cfg_journal_size > journal_len)
     {
         throw std::runtime_error("Requested journal_size is too large");
     }
@@ -321,12 +364,19 @@ static int bs_openmode(const std::string & mode)
 
 void blockstore_disk_t::open_data()
 {
-    data_fd = open(data_device.c_str(), bs_openmode(data_io) | O_RDWR);
+    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);
     if (data_fd == -1)
     {
         throw std::runtime_error("Failed to open data device "+data_device+": "+std::string(strerror(errno)));
     }
-    check_size(data_fd, &data_device_size, &data_device_sect, "data device");
+    if (!mock_mode)
+    {
+        check_size(data_fd, &data_device_size, &data_device_sect, "data device");
+    }
     if (disk_alignment % data_device_sect)
     {
         throw std::runtime_error(
@@ -338,7 +388,7 @@ void blockstore_disk_t::open_data()
     {
         throw std::runtime_error("data_offset exceeds device size = "+std::to_string(data_device_size));
     }
-    if (!disable_flock && flock(data_fd, LOCK_EX|LOCK_NB) != 0)
+    if (!mock_mode && !disable_flock && flock(data_fd, LOCK_EX|LOCK_NB) != 0)
     {
         throw std::runtime_error(std::string("Failed to lock data device: ") + strerror(errno));
     }
@@ -346,19 +396,26 @@ 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 = open(meta_device.c_str(), bs_openmode(meta_io) | O_RDWR);
+        meta_fd = mock_mode ? MOCK_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)));
         }
-        check_size(meta_fd, &meta_device_size, &meta_device_sect, "metadata device");
+        if (!mock_mode)
+        {
+            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 (!disable_flock && meta_device != data_device && flock(meta_fd, LOCK_EX|LOCK_NB) != 0)
+        if (!mock_mode && !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));
         }
@@ -384,15 +441,26 @@ 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 = open(journal_device.c_str(), bs_openmode(journal_io) | O_RDWR);
+        journal_fd = mock_mode ? MOCK_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)));
         }
-        check_size(journal_fd, &journal_device_size, &journal_device_sect, "journal device");
-        if (!disable_flock && journal_device != meta_device && flock(journal_fd, LOCK_EX|LOCK_NB) != 0)
+        if (!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)
         {
             throw std::runtime_error(std::string("Failed to lock journal device: ") + strerror(errno));
         }
@@ -418,25 +486,32 @@ void blockstore_disk_t::open_journal()
 
 void blockstore_disk_t::close_all()
 {
-    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 (!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);
+    }
     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(allocator_t *alloc)
+int blockstore_disk_t::trim_data(std::function<bool(uint64_t)> is_free)
 {
+    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 || alloc->get(i))
+        if (i >= block_count || is_free(i))
         {
             if (i > j && (i-j)*data_block_size >= min_discard_size)
             {

src/blockstore/blockstore_disk.h

@@ -8,10 +8,19 @@
 #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
@@ -22,11 +31,15 @@ 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
-    uint64_t journal_block_size = 4096;
+    uint32_t journal_block_size = 4096;
     // Metadata block size - minimum_io_size of the metadata device is the best choice
-    uint64_t meta_block_size = 4096;
+    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;
     // Sparse write tracking granularity. 4 KB is a good choice. Must be a multiple of disk_alignment
-    uint64_t bitmap_granularity = 4096;
+    uint32_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
@@ -36,27 +49,36 @@ 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_len, meta_format = 0;
+    uint64_t meta_offset, meta_device_sect, meta_device_size, meta_area_size, min_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, clean_entry_size = 0, clean_dyn_size = 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;
 
     void parse_config(std::map<std::string, std::string> & config);
     void open_data();
     void open_meta();
     void open_journal();
-    void calc_lengths(bool skip_meta_check = false);
+    void calc_lengths();
+    void check_lengths();
     void close_all();
-    int trim_data(allocator_t *alloc);
+    int trim_data(std::function<bool(uint64_t)> is_free);
 
     inline uint64_t dirty_dyn_size(uint64_t offset, uint64_t len)
     {

src/blockstore/blockstore_flush.h

@@ -1,22 +1,12 @@
 // Copyright (c) Vitaliy Filippov, 2019+
 // License: VNPL-1.1 (see README.md for details)
 
-#define COPY_BUF_JOURNAL 1
-#define COPY_BUF_DATA 2
-#define COPY_BUF_ZERO 4
-#define COPY_BUF_CSUM_FILL 8
-#define COPY_BUF_COALESCED 16
-#define COPY_BUF_META_BLOCK 32
-#define COPY_BUF_JOURNALED_BIG 64
-
 struct copy_buffer_t
 {
-    int copy_flags;
-    uint64_t offset, len, disk_offset;
-    uint64_t journal_sector; // only for reads: sector+1 if used and !journal.inmemory, otherwise 0
-    void *buf;
-    uint8_t *csum_buf;
-    int *dyn_data;
+    uint32_t copy_flags;
+    uint64_t offset, len, disk_loc, disk_offset, disk_len;
+    uint8_t *buf;
+    uint64_t wr_lsn;
 };
 
 struct meta_sector_t
@@ -27,13 +17,6 @@ struct meta_sector_t
     int usage_count;
 };
 
-struct flusher_sync_t
-{
-    bool fsync_meta;
-    int ready_count;
-    int state;
-};
-
 struct flusher_meta_write_t
 {
     uint64_t sector, pos;
@@ -49,93 +32,75 @@ class journal_flusher_co
 {
     blockstore_impl_t *bs;
     journal_flusher_t *flusher;
-    int wait_state, wait_count, wait_journal_count;
+    int co_id;
+    int wait_state, wait_count;
     struct io_uring_sqe *sqe;
     struct ring_data_t *data;
 
-    std::list<flusher_sync_t>::iterator cur_sync;
+    std::function<void(ring_data_t*)> simple_callback_r, simple_callback_w;
 
-    obj_ver_id cur;
-    std::map<obj_ver_id, dirty_entry>::iterator dirty_it, dirty_start, dirty_end;
-    std::map<object_id, uint64_t>::iterator repeat_it;
-    std::function<void(ring_data_t*)> simple_callback_r, simple_callback_rj, simple_callback_w;
+    object_id cur_oid;
+    uint64_t copy_id;
+    uint64_t compact_lsn;
+    uint64_t cur_version;
+    heap_object_t *cur_obj;
+    heap_write_t *begin_wr, *end_wr;
+    uint32_t modified_block;
+    bool should_repeat;
 
-    bool try_trim = false;
-    bool skip_copy, has_delete, has_writes;
-    std::vector<copy_buffer_t> v;
-    std::vector<copy_buffer_t>::iterator it;
-    int i;
-    bool fill_incomplete, cleared_incomplete;
-    int read_to_fill_incomplete;
+    std::vector<copy_buffer_t> read_vec;
+    uint32_t overwrite_start, overwrite_end;
+    uint32_t big_start, big_end;
+    int i, res;
+    bool read_to_fill_incomplete;
     int copy_count;
-    uint64_t clean_loc, clean_ver, old_clean_loc, old_clean_ver;
+    uint64_t clean_loc;
     flusher_meta_write_t meta_old, meta_new;
-    bool clean_init_bitmap;
-    uint64_t clean_bitmap_offset, clean_bitmap_len;
-    uint8_t *clean_init_dyn_ptr;
-    uint8_t *new_clean_bitmap;
-
-    uint64_t new_trim_pos;
+    bool do_repeat = false;
 
     friend class journal_flusher_t;
-    void scan_dirty();
-    bool read_dirty(int wait_base);
-    bool modify_meta_do_reads(int wait_base);
-    bool wait_meta_reads(int wait_base);
-    bool modify_meta_read(uint64_t meta_loc, flusher_meta_write_t &wr, int wait_base);
-    bool clear_incomplete_csum_block_bits(int wait_base);
-    void calc_block_checksums(uint32_t *new_data_csums, bool skip_overwrites);
-    void update_metadata_entry();
-    bool write_meta_block(flusher_meta_write_t & meta_block, int wait_base);
-    void update_clean_db();
-    void free_data_blocks();
-    bool fsync_batch(bool fsync_meta, int wait_base);
-    bool trim_journal(int wait_base);
+
+    void iterate_checksum_holes(std::function<void(int & pos, uint32_t hole_start, uint32_t hole_end)> cb);
+    void fill_partial_checksum_blocks();
     void free_buffers();
+    int check_and_punch_checksums();
+    bool calc_block_checksums();
+    bool write_meta_block(int wait_base);
+    bool read_buffered(int wait_base);
+    bool fsync_meta(int wait_base);
+    int fsync_buffer(int wait_base);
+    bool trim_lsn(int wait_base);
 public:
     journal_flusher_co();
+    ~journal_flusher_co();
     bool loop();
 };
 
 // Journal flusher itself
 class journal_flusher_t
 {
-    int trim_wanted = 0;
-    bool dequeuing;
-    int min_flusher_count, max_flusher_count, cur_flusher_count, target_flusher_count;
-    int flusher_start_threshold;
+    int force_start = 0;
+    int min_flusher_count = 0, max_flusher_count = 0, cur_flusher_count = 0, target_flusher_count = 0;
     journal_flusher_co *co;
     blockstore_impl_t *bs;
     friend class journal_flusher_co;
 
-    int journal_trim_counter;
-    bool trimming;
-    void* journal_superblock;
+    int advance_lsn_counter = 0;
+    uint64_t compact_counter = 0;
 
-    int active_flushers;
-    int syncing_flushers;
-    std::list<flusher_sync_t> syncs;
-    std::map<object_id, uint64_t> sync_to_repeat;
-
-    std::map<uint64_t, meta_sector_t> meta_sectors;
-    std::deque<object_id> flush_queue;
-    std::map<object_id, uint64_t> flush_versions; // FIXME: consider unordered_map?
-
-    bool try_find_older(std::map<obj_ver_id, dirty_entry>::iterator & dirty_end, obj_ver_id & cur);
-    bool try_find_other(std::map<obj_ver_id, dirty_entry>::iterator & dirty_end, obj_ver_id & cur);
+    int active_flushers = 0;
+    int wanting_meta_fsync = 0;
+    bool fsyncing_meta = false;
+    int syncing_buffer = 0;
 
 public:
     journal_flusher_t(blockstore_impl_t *bs);
     ~journal_flusher_t();
     void loop();
-    bool is_trim_wanted() { return trim_wanted; }
+    int get_syncing_buffer();
+    uint64_t get_compact_counter();
     bool is_active();
-    void mark_trim_possible();
     void request_trim();
     void release_trim();
-    void enqueue_flush(obj_ver_id oid);
-    void unshift_flush(obj_ver_id oid, bool force);
-    void remove_flush(object_id oid);
     void dump_diagnostics();
-    bool is_mutated(uint64_t clean_loc);
 };

src/blockstore/blockstore_heap.h

@@ -0,0 +1,376 @@
+// Metadata storage version 3 ("heap")
+// Copyright (c) Vitaliy Filippov, 2025+
+// License: VNPL-1.1 (see README.md for details)
+
+#pragma once
+
+#include <map>
+#include <unordered_map>
+#include <set>
+#include <deque>
+#include <vector>
+
+#include "../client/object_id.h"
+#include "../util/robin_hood.h"
+#include "blockstore_disk.h"
+#include "multilist.h"
+
+struct pool_shard_settings_t
+{
+    uint32_t pg_count;
+    uint32_t pg_stripe_size;
+};
+
+#define BS_HEAP_TYPE 7
+#define BS_HEAP_OBJECT 1
+#define BS_HEAP_SMALL_WRITE 2
+#define BS_HEAP_BIG_WRITE 3
+#define BS_HEAP_TOMBSTONE 4
+#define BS_HEAP_INTENT_WRITE 5
+#define BS_HEAP_STABLE 8
+
+class blockstore_heap_t;
+
+struct __attribute__((__packed__)) heap_small_write_t
+{
+    uint16_t size;
+    int16_t next_pos;
+    uint8_t flags;
+    uint64_t lsn;
+    uint64_t version;
+    uint64_t location;
+    uint32_t offset;
+    uint32_t len;
+};
+
+struct __attribute__((__packed__)) heap_big_write_t
+{
+    uint16_t size;
+    int16_t next_pos;
+    uint8_t flags;
+    uint64_t lsn;
+    uint64_t version;
+    uint32_t block_num;
+};
+
+struct __attribute__((__packed__)) heap_tombstone_t
+{
+    uint16_t size;
+    int16_t next_pos;
+    uint8_t flags;
+    uint64_t lsn;
+    uint64_t version;
+};
+
+struct __attribute__((__packed__)) heap_write_t
+{
+    // size should have top bit cleared
+    uint16_t size = 0;
+    int16_t next_pos = 0;
+    uint8_t entry_type = 0; // BS_HEAP_*
+    uint64_t lsn = 0;
+    uint64_t version = 0;
+
+    // uint8_t[] external_bitmap
+    // uint8_t[] internal_bitmap
+    // uint32_t[] checksums
+
+    heap_write_t *next();
+    inline uint8_t type() const { return (entry_type & BS_HEAP_TYPE); }
+    inline heap_small_write_t& small() { return *(heap_small_write_t*)this; }
+    inline heap_big_write_t& big() { return *(heap_big_write_t*)this; }
+    uint32_t get_size(blockstore_heap_t *heap);
+    uint32_t get_csum_size(blockstore_heap_t *heap);
+    bool needs_recheck(blockstore_heap_t *heap);
+    bool needs_compact(blockstore_heap_t *heap);
+    bool is_compacted(uint64_t compacted_lsn);
+    bool can_be_collapsed(blockstore_heap_t *heap);
+    bool is_allowed_before_compacted(uint64_t compacted_lsn, bool is_last_entry);
+    uint8_t *get_ext_bitmap(blockstore_heap_t *heap);
+    uint8_t *get_int_bitmap(blockstore_heap_t *heap);
+    uint8_t *get_checksums(blockstore_heap_t *heap);
+    uint32_t *get_checksum(blockstore_heap_t *heap);
+    uint64_t big_location(blockstore_heap_t *heap);
+    void set_big_location(blockstore_heap_t *heap, uint64_t location);
+};
+
+struct __attribute__((__packed__)) heap_object_t
+{
+    // size should have top bit cleared
+    uint16_t size = 0;
+    // linked list of write entries...
+    // newest entries are stored first to simplify scanning
+    int16_t write_pos = 0;
+    uint8_t entry_type = 0; // BS_HEAP_*
+    uint32_t crc32c = 0;
+    uint64_t inode = 0;
+    uint64_t stripe = 0;
+
+    heap_write_t *get_writes();
+    uint32_t calc_crc32c();
+};
+
+struct heap_object_lsn_t
+{
+    object_id oid;
+    uint64_t lsn;
+};
+
+inline bool operator < (const heap_object_lsn_t & a, const heap_object_lsn_t & b)
+{
+    return a.oid < b.oid || a.oid == b.oid && a.lsn < b.lsn;
+}
+
+struct tmp_compact_item_t
+{
+    object_id oid;
+    uint64_t lsn;
+    bool compact;
+};
+
+struct heap_mvcc_copy_id_t
+{
+    object_id oid;
+    uint64_t copy_id;
+};
+
+inline bool operator == (const heap_mvcc_copy_id_t & a, const heap_mvcc_copy_id_t & b)
+{
+    return a.oid.inode == b.oid.inode && a.oid.stripe == b.oid.stripe && a.copy_id == b.copy_id;
+}
+
+namespace std
+{
+    template<> struct hash<heap_mvcc_copy_id_t>
+    {
+        inline size_t operator()(const heap_mvcc_copy_id_t &s) const
+        {
+            size_t seed = std::hash<object_id>()(s.oid);
+            // Copy-pasted from spp::hash_combine()
+            seed ^= (s.copy_id + 0xc6a4a7935bd1e995 + (seed << 6) + (seed >> 2));
+            return seed;
+        }
+    };
+};
+
+struct heap_object_mvcc_t
+{
+    uint32_t readers = 0;
+    heap_object_t *entry_copy = NULL;
+};
+
+struct __attribute__((__packed__)) heap_block_info_t
+{
+    uint32_t used_space = 0;
+    uint32_t free_pos = 0;
+    uint8_t *data = NULL;
+};
+
+struct heap_inflight_lsn_t
+{
+    object_id oid;
+    uint64_t flags;
+};
+
+struct heap_refqi_t
+{
+    uint64_t lsn;
+    uint64_t inode;
+    uint64_t location;
+    uint32_t len;
+    bool is_data;
+};
+
+using i64hash_t = robin_hood::hash<uint64_t>;
+using heap_block_index_t = robin_hood::unordered_flat_map<uint64_t,
+    robin_hood::unordered_flat_map<inode_t, robin_hood::unordered_flat_map<uint64_t, uint64_t, i64hash_t, std::equal_to<uint64_t>, 88>, i64hash_t>, i64hash_t>;
+using heap_mvcc_map_t = robin_hood::unordered_flat_map<heap_mvcc_copy_id_t, heap_object_mvcc_t>;
+
+class blockstore_heap_t
+{
+    friend class heap_write_t;
+    friend class heap_object_t;
+
+    blockstore_disk_t *dsk = NULL;
+    uint8_t* buffer_area = NULL;
+    bool abort_on_corruption = false;
+    bool abort_on_overlap = true;
+    int log_level = 0;
+
+    const uint32_t meta_block_count = 0;
+    uint32_t target_block_free_space = 800;
+
+    uint64_t next_lsn = 0;
+    robin_hood::unordered_flat_map<pool_id_t, pool_shard_settings_t> pool_shard_settings;
+    // PG => inode => stripe => block number
+    heap_block_index_t block_index;
+    std::vector<heap_block_info_t> block_info;
+    allocator_t *data_alloc = NULL;
+    multilist_index_t *meta_alloc = NULL;
+    uint32_t meta_alloc_count = 0;
+    uint64_t meta_used_space = 0;
+    multilist_alloc_t *buffer_alloc = NULL;
+    heap_mvcc_map_t object_mvcc;
+    std::unordered_map<uint64_t, uint32_t> mvcc_data_refs;
+    std::unordered_map<uint64_t, uint32_t> mvcc_buffer_refs;
+    std::map<uint64_t, uint64_t> inode_space_stats;
+    uint64_t buffer_area_used_space = 0;
+    uint64_t data_used_space = 0;
+
+    // LSN queue: inflight (writing) -> completed [-> fsynced] -> compactable -> compacted [-> fsynced] -> trimmed and removed
+    std::deque<heap_inflight_lsn_t> inflight_lsn;
+    uint32_t to_compact_count = 0;
+    uint64_t first_inflight_lsn = 0;
+    uint64_t completed_lsn = 0;
+    uint64_t fsynced_lsn = 0;
+    uint64_t compacted_lsn = 0;
+    uint64_t next_compact_lsn = 0;
+    std::deque<heap_refqi_t> overwrite_ref_queue;
+
+    std::vector<tmp_compact_item_t> tmp_compact_queue;
+    std::deque<object_id> recheck_queue;
+    int recheck_in_progress = 0;
+    bool in_recheck = false;
+    std::function<void(bool is_data, uint64_t offset, uint64_t len, uint8_t* buf, std::function<void()>)> recheck_cb;
+    int recheck_queue_depth = 0;
+
+    const uint32_t max_write_entry_size;
+
+    uint64_t get_pg_id(inode_t inode, uint64_t stripe);
+    void defragment_block(uint32_t block_num);
+    uint32_t find_block_run(heap_block_info_t & block, uint32_t space);
+    uint32_t find_block_space(uint32_t block_num, uint32_t space);
+    uint32_t block_has_compactable(uint8_t *data);
+    uint32_t compact_object_to(heap_object_t *obj, uint64_t lsn, uint8_t *new_csums, bool do_free);
+    void copy_full_object(uint8_t *dst, heap_object_t *obj);
+    bool mvcc_save_copy(heap_object_t *obj);
+    bool mvcc_check_tracking(object_id oid);
+    void free_mvcc(heap_mvcc_map_t::iterator mvcc_it);
+    void allocate_block(heap_block_info_t & inf);
+    int allocate_new_object(object_id oid, uint32_t full_object_size, uint32_t *modified_block, heap_object_t **new_obj);
+    int add_object(object_id oid, heap_write_t *wr, uint32_t *modified_block);
+    void mark_overwritten(uint64_t over_lsn, uint64_t inode, heap_write_t *wr, heap_write_t *end_wr, bool tracking_active);
+    int update_object(uint32_t block_num, heap_object_t *obj, heap_write_t *wr, uint32_t *modified_block, uint32_t *moved_from_block);
+    void init_erase(uint32_t block_num, heap_object_t *obj);
+    void erase_object(uint32_t block_num, heap_object_t *obj, uint64_t lsn, bool tracking_active);
+    void reindex_block(uint32_t block_num, heap_object_t *from_obj);
+    void erase_block_index(inode_t inode, uint64_t stripe);
+    void deref_data(uint64_t inode, uint64_t location, bool free_at_0);
+    void deref_buffer(uint64_t inode, uint64_t location, uint32_t len, bool free_at_0);
+    void deref_overwrites(uint64_t lsn);
+    void free_object_space(inode_t inode, heap_write_t *from, heap_write_t *to, int mode = 0);
+    void add_used_space(uint32_t block_num, int32_t used_delta);
+    void push_inflight_lsn(object_id oid, uint64_t lsn, uint64_t flags);
+
+public:
+    blockstore_heap_t(blockstore_disk_t *dsk, uint8_t *buffer_area, int log_level = 0);
+    ~blockstore_heap_t();
+    // set initially compacted lsn - should be done before loading
+    void set_compacted_lsn(uint64_t compacted_lsn);
+    uint64_t get_compacted_lsn();
+    // load data from the disk, returns count of loaded write entries
+    void read_blocks(uint64_t disk_offset, uint64_t size, uint8_t *buf,
+        std::function<void(heap_object_t*)> handle_object, std::function<void(uint32_t, uint32_t, uint8_t*)> handle_block);
+    uint64_t load_blocks(uint64_t disk_offset, uint64_t size, uint8_t *buf);
+    // finish loading
+    void finish_load();
+    // recheck small write data after reading the database from disk
+    bool recheck_small_writes(std::function<void(bool is_data, uint64_t offset, uint64_t len, uint8_t* buf, std::function<void()>)> read_buffer, int queue_depth);
+    // initialize metadata area (fill it with empty data)
+    // returns 0 when done, EAGAIN when the caller has to wait more
+    int initialize();
+    // read from the metadata area
+    // returns 0 when done, EAGAIN when the caller has to wait more
+    int read();
+    // reshard database according to the pool's PG count
+    void reshard(pool_id_t pool, uint32_t pg_count, uint32_t pg_stripe_size);
+    // read an object entry and lock it against removal
+    // in the future, may become asynchronous
+    heap_object_t *lock_and_read_entry(object_id oid, uint64_t & copy_id);
+    // re-read a locked object entry with the given lsn (pointer may be invalidated)
+    heap_object_t *read_locked_entry(object_id oid, uint64_t copy_id);
+    // read an object entry without locking it
+    heap_object_t *read_entry(object_id oid, uint32_t *block_num_ptr, bool for_update = false);
+    // unlock an entry
+    bool unlock_entry(object_id oid, uint64_t copy_id);
+    // set or verify checksums in a write request
+    bool calc_checksums(heap_write_t *wr, uint8_t *data, bool set, uint32_t offset = 0, uint32_t len = 0);
+    // set or verify raw block checksums
+    bool calc_block_checksums(uint32_t *block_csums, uint8_t *data, uint8_t *bitmap, uint32_t start, uint32_t end,
+        bool set, std::function<void(uint32_t, uint32_t, uint32_t)> bad_block_cb);
+    bool calc_block_checksums(uint32_t *block_csums, uint8_t *bitmap,
+        uint32_t start, uint32_t end, std::function<uint8_t*(uint32_t start, uint32_t & len)> next,
+        bool set, std::function<void(uint32_t, uint32_t, uint32_t)> bad_block_cb);
+    // copy an object as is
+    int copy_object(heap_object_t *obj, uint32_t *modified_block);
+    // auto-compacts the object, then adds a write entry to it and to the compaction queue
+    // return 0 if OK, or maybe ENOSPC
+    int post_write(object_id oid, heap_write_t *wr, uint32_t *modified_block, uint32_t *moved_from_block);
+    int post_write(uint32_t & block_num, object_id oid, heap_object_t *obj, heap_write_t *wr, uint32_t *moved_from_block);
+    // stabilize an unstable object version
+    // return 0 if OK, ENOENT if not exists
+    int post_stabilize(object_id oid, uint64_t version, uint32_t *modified_block, uint64_t *new_lsn, uint64_t *new_to_lsn);
+    // rollback an unstable object version
+    // return 0 if OK, ENOENT if not exists, EBUSY if already stable
+    int post_rollback(object_id oid, uint64_t version, uint64_t *new_lsn, uint32_t *modified_block);
+    // forget an object
+    // return error code
+    int post_delete(object_id oid, uint64_t *new_lsn, uint32_t *modified_block);
+    int post_delete(uint32_t block_num, heap_object_t *obj, uint64_t *new_lsn);
+    // get the next object to compact
+    // guaranteed to return objects in min lsn order
+    // returns 0 if OK, ENOENT if nothing to compact
+    int get_next_compact(object_id & oid);
+    // get the range of an object eligible for compaction
+    void get_compact_range(heap_object_t *obj, uint64_t max_lsn, heap_write_t **begin_wr, heap_write_t **end_wr);
+    // mark an object as compacted up to the given lsn
+    int compact_object(object_id oid, uint64_t lsn, uint8_t *new_csums);
+    // retrieve object listing from a PG
+    int list_objects(uint32_t pg_num, object_id min_oid, object_id max_oid,
+        obj_ver_id **result_list, size_t *stable_count, size_t *unstable_count);
+    // set a block number for a new object and returns error status: 0, EAGAIN or ENOSPC
+    int get_block_for_new_object(uint32_t & out_block_num, uint32_t size = 0);
+
+    // inflight write tracking
+    void mark_lsn_completed(uint64_t lsn);
+    void mark_lsn_fsynced(uint64_t lsn);
+    void mark_lsn_compacted(uint64_t lsn, bool allow_undone = false);
+    void mark_object_compacted(heap_object_t *obj, uint64_t max_lsn);
+    void mark_lsn_trimmed(uint64_t lsn);
+    uint64_t get_completed_lsn();
+    uint64_t get_fsynced_lsn();
+
+    // data device block allocator functions
+    uint64_t find_free_data();
+    bool is_data_used(uint64_t location);
+    void use_data(inode_t inode, uint64_t location);
+    void free_data(inode_t inode, uint64_t location);
+
+    // buffer device allocator functions
+    uint64_t find_free_buffer_area(uint64_t size);
+    bool is_buffer_area_free(uint64_t location, uint64_t size);
+    void use_buffer_area(inode_t inode, uint64_t location, uint64_t size);
+    void free_buffer_area(inode_t inode, uint64_t location, uint64_t size);
+    uint64_t get_buffer_area_used_space();
+
+    // get metadata block data buffer and used space
+    uint8_t *get_meta_block(uint32_t block_num);
+    uint32_t get_meta_block_used_space(uint32_t block_num);
+
+    // get space usage statistics
+    uint64_t get_data_used_space();
+    const std::map<uint64_t, uint64_t> & get_inode_space_stats();
+    uint64_t get_meta_total_space();
+    uint64_t get_meta_used_space();
+    uint32_t get_meta_nearfull_blocks();
+    uint32_t get_inflight_queue_size();
+    uint32_t get_compact_queue_size();
+    uint32_t get_to_compact_count();
+
+    // get maximum size for a temporary heap_write_t buffer
+    uint32_t get_max_write_entry_size();
+
+    // only for tests
+    void set_abort_on_corruption(bool fail);
+    void set_abort_on_overlap(bool fail);
+};

src/blockstore/blockstore_impl.cpp

@@ -1,13 +1,18 @@
 // Copyright (c) Vitaliy Filippov, 2019+
 // License: VNPL-1.1 (see README.md for details)
 
-#include "blockstore_impl.h"
+#include <stdexcept>
 
-blockstore_impl_t::blockstore_impl_t(blockstore_config_t & config, ring_loop_t *ringloop, timerfd_manager_t *tfd)
+#include "blockstore_impl.h"
+#include "blockstore_internal.h"
+#include "crc32c.h"
+
+blockstore_impl_t::blockstore_impl_t(blockstore_config_t & config, ring_loop_i *ringloop, timerfd_manager_t *tfd, bool mock_mode)
 {
     assert(sizeof(blockstore_op_private_t) <= BS_OP_PRIVATE_DATA_SIZE);
     this->tfd = tfd;
     this->ringloop = ringloop;
+    dsk.mock_mode = mock_mode;
     ring_consumer.loop = [this]() { loop(); };
     ringloop->register_consumer(&ring_consumer);
     initialized = 0;
@@ -17,31 +22,43 @@ blockstore_impl_t::blockstore_impl_t(blockstore_config_t & config, ring_loop_t *
         dsk.open_data();
         dsk.open_meta();
         dsk.open_journal();
-        calc_lengths();
-        alloc_dyn_data = dsk.clean_dyn_size > sizeof(void*) || dsk.csum_block_size > 0;
+        dsk.calc_lengths();
         zero_object = (uint8_t*)memalign_or_die(MEM_ALIGNMENT, dsk.data_block_size);
-        data_alloc = new allocator_t(dsk.block_count);
     }
     catch (std::exception & e)
     {
         dsk.close_all();
         throw;
     }
+    memset(zero_object, 0, dsk.data_block_size);
+    meta_superblock = (uint8_t*)memalign_or_die(MEM_ALIGNMENT, dsk.meta_block_size);
+    memset(meta_superblock, 0, dsk.meta_block_size);
+}
+
+void blockstore_impl_t::init()
+{
     flusher = new journal_flusher_t(this);
+    if (dsk.inmemory_journal)
+    {
+        buffer_area = (uint8_t*)memalign_or_die(MEM_ALIGNMENT, dsk.journal_len);
+    }
+    heap = new blockstore_heap_t(&dsk, buffer_area, log_level);
 }
 
 blockstore_impl_t::~blockstore_impl_t()
 {
-    delete data_alloc;
-    delete flusher;
+    if (flusher)
+        delete flusher;
+    if (heap)
+        delete heap;
+    if (buffer_area)
+        free(buffer_area);
+    if (meta_superblock)
+        free(meta_superblock);
     if (zero_object)
         free(zero_object);
     ringloop->unregister_consumer(&ring_consumer);
     dsk.close_all();
-    if (metadata_buffer)
-        free(metadata_buffer);
-    if (clean_bitmaps)
-        free(clean_bitmaps);
 }
 
 bool blockstore_impl_t::is_started()
@@ -57,10 +74,9 @@ bool blockstore_impl_t::is_stalled()
 // main event loop - produce requests
 void blockstore_impl_t::loop()
 {
-    // FIXME: initialized == 10 is ugly
     if (initialized != 10)
     {
-        // read metadata, then journal
+        // read metadata
         if (initialized == 0)
         {
             metadata_init_reader = new blockstore_init_meta(this);
@@ -73,69 +89,41 @@ void blockstore_impl_t::loop()
             {
                 delete metadata_init_reader;
                 metadata_init_reader = NULL;
-                journal_init_reader = new blockstore_init_journal(this);
-                initialized = 2;
-            }
-        }
-        if (initialized == 2)
-        {
-            int res = journal_init_reader->loop();
-            if (!res)
-            {
-                delete journal_init_reader;
-                journal_init_reader = NULL;
                 initialized = 3;
-                ringloop->wakeup();
             }
         }
         if (initialized == 3)
         {
             if (!readonly && dsk.discard_on_start)
-                dsk.trim_data(data_alloc);
-            if (journal.flush_journal)
-                initialized = 4;
-            else
-                initialized = 10;
-        }
-        if (initialized == 4)
-        {
-            if (readonly)
             {
-                printf("Can't flush the journal in readonly mode\n");
-                exit(1);
+                dsk.trim_data([this](uint64_t block_num){ return heap->is_data_used(block_num * dsk.data_block_size); });
             }
-            flusher->loop();
-            ringloop->submit();
+            initialized = 10;
         }
     }
     else
     {
         // try to submit ops
         unsigned initial_ring_space = ringloop->space_left();
-        // has_writes == 0 - no writes before the current queue item
-        // has_writes == 1 - some writes in progress
-        // has_writes == 2 - tried to submit some writes, but failed
-        int has_writes = 0, op_idx = 0, new_idx = 0;
+        int op_idx = 0, new_idx = 0;
+        bool has_unfinished_writes = false;
         for (; op_idx < submit_queue.size(); op_idx++, new_idx++)
         {
             auto op = submit_queue[op_idx];
             submit_queue[new_idx] = op;
-            // FIXME: This needs some simplification
-            // Writes should not block reads if the ring is not full and reads don't depend on them
-            // In all other cases we should stop submission
             if (PRIV(op)->wait_for)
             {
                 check_wait(op);
                 if (PRIV(op)->wait_for == WAIT_SQE)
                 {
+                    // ring is full, stop submission
                     break;
                 }
                 else if (PRIV(op)->wait_for)
                 {
-                    if (op->opcode == BS_OP_WRITE || op->opcode == BS_OP_WRITE_STABLE || op->opcode == BS_OP_DELETE)
-                    {
-                        has_writes = 2;
-                    }
+                    has_unfinished_writes = has_unfinished_writes || op->opcode == BS_OP_WRITE ||
+                        op->opcode == BS_OP_WRITE_STABLE || op->opcode == BS_OP_DELETE ||
+                        op->opcode == BS_OP_STABLE || op->opcode == BS_OP_ROLLBACK;
                     continue;
                 }
             }
@@ -148,46 +136,33 @@ void blockstore_impl_t::loop()
             {
                 wr_st = dequeue_read(op);
             }
-            else if (op->opcode == BS_OP_WRITE || op->opcode == BS_OP_WRITE_STABLE)
+            else if (op->opcode == BS_OP_WRITE || op->opcode == BS_OP_WRITE_STABLE || op->opcode == BS_OP_DELETE)
             {
-                if (has_writes == 2)
-                {
-                    // Some writes already could not be submitted
-                    continue;
-                }
                 wr_st = dequeue_write(op);
-                has_writes = wr_st > 0 ? 1 : 2;
-            }
-            else if (op->opcode == BS_OP_DELETE)
-            {
-                if (has_writes == 2)
-                {
-                    // Some writes already could not be submitted
-                    continue;
-                }
-                wr_st = dequeue_del(op);
-                has_writes = wr_st > 0 ? 1 : 2;
+                has_unfinished_writes = has_unfinished_writes || (wr_st != 2);
             }
             else if (op->opcode == BS_OP_SYNC)
             {
-                // sync only completed writes?
-                // wait for the data device fsync to complete, then submit journal writes for big writes
-                // then submit an fsync operation
+                // syncs only completed writes, so doesn't have to be blocked by anything
                 wr_st = continue_sync(op);
             }
-            else if (op->opcode == BS_OP_STABLE)
+            else if (op->opcode == BS_OP_STABLE || op->opcode == BS_OP_ROLLBACK)
             {
                 wr_st = dequeue_stable(op);
-            }
-            else if (op->opcode == BS_OP_ROLLBACK)
-            {
-                wr_st = dequeue_rollback(op);
+                has_unfinished_writes = has_unfinished_writes || (wr_st != 2);
             }
             else if (op->opcode == BS_OP_LIST)
             {
-                // LIST doesn't have to be blocked by previous modifications
-                process_list(op);
-                wr_st = 2;
+                // LIST has to be blocked by previous writes and commits/rollbacks
+                if (!has_unfinished_writes)
+                {
+                    process_list(op);
+                    wr_st = 2;
+                }
+                else
+                {
+                    wr_st = 0;
+                }
             }
             if (wr_st == 2)
             {
@@ -196,16 +171,13 @@ void blockstore_impl_t::loop()
             }
             if (wr_st == 0)
             {
+                PRIV(op)->pending_ops = 0;
                 ringloop->restore(prev_sqe_pos);
                 if (PRIV(op)->wait_for == WAIT_SQE)
                 {
                     // ring is full, stop submission
                     break;
                 }
-                else if (PRIV(op)->wait_for == WAIT_JOURNAL)
-                {
-                    PRIV(op)->wait_detail2 = (unstable_writes.size()+unstable_unsynced);
-                }
             }
         }
         if (op_idx != new_idx)
@@ -225,12 +197,6 @@ void blockstore_impl_t::loop()
         {
             throw std::runtime_error(std::string("io_uring_submit: ") + strerror(-ret));
         }
-        for (auto s: journal.submitting_sectors)
-        {
-            // Mark journal sector writes as submitted
-            journal.sector_info[s].submit_id = 0;
-        }
-        journal.submitting_sectors.clear();
         if ((initial_ring_space - ringloop->space_left()) > 0)
         {
             live = true;
@@ -248,7 +214,7 @@ bool blockstore_impl_t::is_safe_to_stop()
     {
         return false;
     }
-    if (unsynced_big_writes.size() > 0 || unsynced_small_writes.size() > 0)
+    if (unsynced_big_write_count > 0 || unsynced_small_write_count > 0)
     {
         if (!readonly && !stop_sync_submitted)
         {
@@ -272,7 +238,7 @@ void blockstore_impl_t::check_wait(blockstore_op_t *op)
 {
     if (PRIV(op)->wait_for == WAIT_SQE)
     {
-        if (ringloop->sqes_left() < PRIV(op)->wait_detail)
+        if (ringloop->space_left() < PRIV(op)->wait_detail)
         {
             // stop submission if there's still no free space
 #ifdef BLOCKSTORE_DEBUG
@@ -282,40 +248,13 @@ void blockstore_impl_t::check_wait(blockstore_op_t *op)
         }
         PRIV(op)->wait_for = 0;
     }
-    else if (PRIV(op)->wait_for == WAIT_JOURNAL)
+    else if (PRIV(op)->wait_for == WAIT_COMPACTION)
     {
-        if (journal.used_start == PRIV(op)->wait_detail &&
-            (unstable_writes.size()+unstable_unsynced) == PRIV(op)->wait_detail2)
+        if (flusher->get_compact_counter() <= PRIV(op)->wait_detail)
         {
             // do not submit
 #ifdef BLOCKSTORE_DEBUG
-            printf("Still waiting to flush journal offset %08jx\n", PRIV(op)->wait_detail);
-#endif
-            return;
-        }
-        flusher->release_trim();
-        PRIV(op)->wait_for = 0;
-    }
-    else if (PRIV(op)->wait_for == WAIT_JOURNAL_BUFFER)
-    {
-        int next = ((journal.cur_sector + 1) % journal.sector_count);
-        if (journal.sector_info[next].flush_count > 0 ||
-            journal.sector_info[next].dirty)
-        {
-            // do not submit
-#ifdef BLOCKSTORE_DEBUG
-            printf("Still waiting for a journal buffer\n");
-#endif
-            return;
-        }
-        PRIV(op)->wait_for = 0;
-    }
-    else if (PRIV(op)->wait_for == WAIT_FREE)
-    {
-        if (!data_alloc->get_free_count() && big_to_flush > 0)
-        {
-#ifdef BLOCKSTORE_DEBUG
-            printf("Still waiting for free space on the data device\n");
+            printf("Still waiting for more flushes\n");
 #endif
             return;
         }
@@ -343,44 +282,6 @@ void blockstore_impl_t::enqueue_op(blockstore_op_t *op)
         ringloop->set_immediate([op]() { std::function<void (blockstore_op_t*)>(op->callback)(op); });
         return;
     }
-    if (op->opcode == BS_OP_SYNC_STAB_ALL)
-    {
-        std::function<void(blockstore_op_t*)> *old_callback = new std::function<void(blockstore_op_t*)>(op->callback);
-        op->opcode = BS_OP_SYNC;
-        op->callback = [this, old_callback](blockstore_op_t *op)
-        {
-            if (op->retval >= 0 && unstable_writes.size() > 0)
-            {
-                op->opcode = BS_OP_STABLE;
-                op->len = unstable_writes.size();
-                obj_ver_id *vers = new obj_ver_id[op->len];
-                op->buf = vers;
-                int i = 0;
-                for (auto it = unstable_writes.begin(); it != unstable_writes.end(); it++, i++)
-                {
-                    vers[i] = {
-                        .oid = it->first,
-                        .version = it->second,
-                    };
-                }
-                unstable_writes.clear();
-                op->callback = [old_callback](blockstore_op_t *op)
-                {
-                    obj_ver_id *vers = (obj_ver_id*)op->buf;
-                    delete[] vers;
-                    op->buf = NULL;
-                    (*old_callback)(op);
-                    delete old_callback;
-                };
-                this->enqueue_op(op);
-            }
-            else
-            {
-                (*old_callback)(op);
-                delete old_callback;
-            }
-        };
-    }
     if ((op->opcode == BS_OP_WRITE || op->opcode == BS_OP_WRITE_STABLE || op->opcode == BS_OP_DELETE) && !enqueue_write(op))
     {
         ringloop->set_immediate([op]() { std::function<void (blockstore_op_t*)>(op->callback)(op); });
@@ -399,75 +300,11 @@ void blockstore_impl_t::init_op(blockstore_op_t *op)
 {
     // Call constructor without allocating memory. We'll call destructor before returning op back
     new ((void*)op->private_data) blockstore_op_private_t;
-    PRIV(op)->min_flushed_journal_sector = PRIV(op)->max_flushed_journal_sector = 0;
     PRIV(op)->wait_for = 0;
     PRIV(op)->op_state = 0;
     PRIV(op)->pending_ops = 0;
 }
 
-static bool replace_stable(object_id oid, uint64_t version, int search_start, int search_end, obj_ver_id* list)
-{
-    while (search_start < search_end)
-    {
-        int pos = search_start+(search_end-search_start)/2;
-        if (oid < list[pos].oid)
-        {
-            search_end = pos;
-        }
-        else if (list[pos].oid < oid)
-        {
-            search_start = pos+1;
-        }
-        else
-        {
-            list[pos].version = version;
-            return true;
-        }
-    }
-    return false;
-}
-
-blockstore_clean_db_t& blockstore_impl_t::clean_db_shard(object_id oid)
-{
-    uint64_t pg_num = 0;
-    uint64_t pool_id = (oid.inode >> (64-POOL_ID_BITS));
-    auto sh_it = clean_db_settings.find(pool_id);
-    if (sh_it != clean_db_settings.end())
-    {
-        // like map_to_pg()
-        pg_num = (oid.stripe / sh_it->second.pg_stripe_size) % sh_it->second.pg_count + 1;
-    }
-    return clean_db_shards[(pool_id << (64-POOL_ID_BITS)) | pg_num];
-}
-
-void blockstore_impl_t::reshard_clean_db(pool_id_t pool, uint32_t pg_count, uint32_t pg_stripe_size)
-{
-    uint64_t pool_id = (uint64_t)pool;
-    std::map<pool_pg_id_t, blockstore_clean_db_t> new_shards;
-    auto sh_it = clean_db_shards.lower_bound((pool_id << (64-POOL_ID_BITS)));
-    while (sh_it != clean_db_shards.end() &&
-        (sh_it->first >> (64-POOL_ID_BITS)) == pool_id)
-    {
-        for (auto & pair: sh_it->second)
-        {
-            // like map_to_pg()
-            uint64_t pg_num = (pair.first.stripe / pg_stripe_size) % pg_count + 1;
-            uint64_t shard_id = (pool_id << (64-POOL_ID_BITS)) | pg_num;
-            new_shards[shard_id][pair.first] = pair.second;
-        }
-        clean_db_shards.erase(sh_it++);
-    }
-    for (sh_it = new_shards.begin(); sh_it != new_shards.end(); sh_it++)
-    {
-        auto & to = clean_db_shards[sh_it->first];
-        to.swap(sh_it->second);
-    }
-    clean_db_settings[pool_id] = (pool_shard_settings_t){
-        .pg_count = pg_count,
-        .pg_stripe_size = pg_stripe_size,
-    };
-}
-
 void blockstore_impl_t::process_list(blockstore_op_t *op)
 {
     uint32_t list_pg = op->pg_number+1;
@@ -476,7 +313,8 @@ void blockstore_impl_t::process_list(blockstore_op_t *op)
     uint64_t min_inode = op->min_oid.inode;
     uint64_t max_inode = op->max_oid.inode;
     // Check PG
-    if (pg_count != 0 && (pg_stripe_size < MIN_DATA_BLOCK_SIZE || list_pg > pg_count))
+    if (!pg_count || (pg_stripe_size < MIN_DATA_BLOCK_SIZE || list_pg > pg_count) ||
+        !INODE_POOL(min_inode) || INODE_POOL(min_inode) != INODE_POOL(max_inode))
     {
         op->retval = -EINVAL;
         FINISH_OP(op);
@@ -484,250 +322,44 @@ void blockstore_impl_t::process_list(blockstore_op_t *op)
     }
     // Check if the DB needs resharding
     // (we don't know about PGs from the beginning, we only create "shards" here)
-    uint64_t first_shard = 0, last_shard = UINT64_MAX;
-    if (min_inode != 0 &&
-        // Check if min_inode == max_inode == pool_id<<N, i.e. this is a pool listing
-        (min_inode >> (64-POOL_ID_BITS)) == (max_inode >> (64-POOL_ID_BITS)))
+    heap->reshard(INODE_POOL(min_inode), pg_count, pg_stripe_size);
+    obj_ver_id *result = NULL;
+    size_t stable_count = 0, unstable_count = 0;
+    int res = heap->list_objects(list_pg, op->min_oid, op->max_oid, &result, &stable_count, &unstable_count);
+    if (op->list_stable_limit)
     {
-        pool_id_t pool_id = (min_inode >> (64-POOL_ID_BITS));
-        if (pg_count > 1)
+        // Ordered result is expected - used by scrub
+        // We use an unordered map
+        std::sort(result, result + stable_count);
+        if (stable_count > op->list_stable_limit)
         {
-            // Per-pg listing
-            auto sh_it = clean_db_settings.find(pool_id);
-            if (sh_it == clean_db_settings.end() ||
-                sh_it->second.pg_count != pg_count ||
-                sh_it->second.pg_stripe_size != pg_stripe_size)
-            {
-                reshard_clean_db(pool_id, pg_count, pg_stripe_size);
-            }
-            first_shard = last_shard = ((uint64_t)pool_id << (64-POOL_ID_BITS)) | list_pg;
-        }
-        else
-        {
-            // Per-pool listing
-            first_shard = ((uint64_t)pool_id << (64-POOL_ID_BITS));
-            last_shard = ((uint64_t)(pool_id+1) << (64-POOL_ID_BITS)) - 1;
+            memmove(result + op->list_stable_limit, result + stable_count, unstable_count);
+            stable_count = op->list_stable_limit;
         }
     }
-    // Copy clean_db entries
-    int stable_count = 0, stable_alloc = 0;
-    if (min_inode != max_inode)
-    {
-        for (auto shard_it = clean_db_shards.lower_bound(first_shard);
-            shard_it != clean_db_shards.end() && shard_it->first <= last_shard;
-            shard_it++)
-        {
-            auto & clean_db = shard_it->second;
-            stable_alloc += clean_db.size();
-        }
-    }
-    if (op->list_stable_limit > 0)
-    {
-        stable_alloc = op->list_stable_limit;
-        if (stable_alloc > 1024*1024)
-            stable_alloc = 1024*1024;
-    }
-    if (stable_alloc < 32768)
-    {
-        stable_alloc = 32768;
-    }
-    obj_ver_id *stable = (obj_ver_id*)malloc(sizeof(obj_ver_id) * stable_alloc);
-    if (!stable)
-    {
-        op->retval = -ENOMEM;
-        FINISH_OP(op);
-        return;
-    }
-    auto max_oid = op->max_oid;
-    bool limited = false;
-    pool_pg_id_t last_shard_id = 0;
-    for (auto shard_it = clean_db_shards.lower_bound(first_shard);
-        shard_it != clean_db_shards.end() && shard_it->first <= last_shard;
-        shard_it++)
-    {
-        auto & clean_db = shard_it->second;
-        auto clean_it = clean_db.begin(), clean_end = clean_db.end();
-        if (op->min_oid.inode != 0 || op->min_oid.stripe != 0)
-        {
-            clean_it = clean_db.lower_bound(op->min_oid);
-        }
-        if ((max_oid.inode != 0 || max_oid.stripe != 0) && !(max_oid < op->min_oid))
-        {
-            clean_end = clean_db.upper_bound(max_oid);
-        }
-        for (; clean_it != clean_end; clean_it++)
-        {
-            if (stable_count >= stable_alloc)
-            {
-                stable_alloc *= 2;
-                obj_ver_id* nst = (obj_ver_id*)realloc(stable, sizeof(obj_ver_id) * stable_alloc);
-                if (!nst)
-                {
-                    op->retval = -ENOMEM;
-                    FINISH_OP(op);
-                    return;
-                }
-                stable = nst;
-            }
-            stable[stable_count++] = {
-                .oid = clean_it->first,
-                .version = clean_it->second.version,
-            };
-            if (op->list_stable_limit > 0 && stable_count >= op->list_stable_limit)
-            {
-                if (!limited)
-                {
-                    limited = true;
-                    max_oid = stable[stable_count-1].oid;
-                }
-                break;
-            }
-        }
-        if (op->list_stable_limit > 0)
-        {
-            // To maintain the order, we have to include objects in the same range from other shards
-            if (last_shard_id != 0 && last_shard_id != shard_it->first)
-                std::sort(stable, stable+stable_count);
-            if (stable_count > op->list_stable_limit)
-                stable_count = op->list_stable_limit;
-        }
-        last_shard_id = shard_it->first;
-    }
-    if (op->list_stable_limit == 0 && first_shard != last_shard)
-    {
-        // If that's not a per-PG listing, sort clean entries (already sorted if list_stable_limit != 0)
-        std::sort(stable, stable+stable_count);
-    }
-    int clean_stable_count = stable_count;
-    // Copy dirty_db entries (sorted, too)
-    int unstable_count = 0, unstable_alloc = 0;
-    obj_ver_id *unstable = NULL;
-    {
-        auto dirty_it = dirty_db.begin(), dirty_end = dirty_db.end();
-        if (op->min_oid.inode != 0 || op->min_oid.stripe != 0)
-        {
-            dirty_it = dirty_db.lower_bound({
-                .oid = op->min_oid,
-                .version = 0,
-            });
-        }
-        if ((max_oid.inode != 0 || max_oid.stripe != 0) && !(max_oid < op->min_oid))
-        {
-            dirty_end = dirty_db.upper_bound({
-                .oid = max_oid,
-                .version = UINT64_MAX,
-            });
-        }
-        for (; dirty_it != dirty_end; dirty_it++)
-        {
-            if (!pg_count || ((dirty_it->first.oid.stripe / pg_stripe_size) % pg_count + 1) == list_pg) // like map_to_pg()
-            {
-                if (IS_DELETE(dirty_it->second.state))
-                {
-                    // Deletions are always stable, so try to zero out two possible entries
-                    if (!replace_stable(dirty_it->first.oid, 0, 0, clean_stable_count, stable))
-                    {
-                        replace_stable(dirty_it->first.oid, 0, clean_stable_count, stable_count, stable);
-                    }
-                }
-                else if (IS_STABLE(dirty_it->second.state) || (dirty_it->second.state & BS_ST_INSTANT))
-                {
-                    // First try to replace a clean stable version in the first part of the list
-                    if (!replace_stable(dirty_it->first.oid, dirty_it->first.version, 0, clean_stable_count, stable))
-                    {
-                        // Then try to replace the last dirty stable version in the second part of the list
-                        if (stable_count > 0 && stable[stable_count-1].oid == dirty_it->first.oid)
-                        {
-                            stable[stable_count-1].version = dirty_it->first.version;
-                        }
-                        else
-                        {
-                            if (stable_count >= stable_alloc)
-                            {
-                                stable_alloc += 32768;
-                                obj_ver_id *nst = (obj_ver_id*)realloc(stable, sizeof(obj_ver_id) * stable_alloc);
-                                if (!nst)
-                                {
-                                    if (unstable)
-                                        free(unstable);
-                                    op->retval = -ENOMEM;
-                                    FINISH_OP(op);
-                                    return;
-                                }
-                                stable = nst;
-                            }
-                            stable[stable_count++] = dirty_it->first;
-                        }
-                    }
-                    if (op->list_stable_limit > 0 && stable_count >= op->list_stable_limit)
-                    {
-                        // Stop here
-                        break;
-                    }
-                }
-                else
-                {
-                    if (unstable_count >= unstable_alloc)
-                    {
-                        unstable_alloc += 32768;
-                        obj_ver_id *nst = (obj_ver_id*)realloc(unstable, sizeof(obj_ver_id) * unstable_alloc);
-                        if (!nst)
-                        {
-                            if (stable)
-                                free(stable);
-                            op->retval = -ENOMEM;
-                            FINISH_OP(op);
-                            return;
-                        }
-                        unstable = nst;
-                    }
-                    unstable[unstable_count++] = dirty_it->first;
-                }
-            }
-        }
-    }
-    // Remove zeroed out stable entries
-    int j = 0;
-    for (int i = 0; i < stable_count; i++)
-    {
-        if (stable[i].version != 0)
-        {
-            stable[j++] = stable[i];
-        }
-    }
-    stable_count = j;
-    if (stable_count+unstable_count > stable_alloc)
-    {
-        stable_alloc = stable_count+unstable_count;
-        obj_ver_id *nst = (obj_ver_id*)realloc(stable, sizeof(obj_ver_id) * stable_alloc);
-        if (!nst)
-        {
-            if (unstable)
-                free(unstable);
-            op->retval = -ENOMEM;
-            FINISH_OP(op);
-            return;
-        }
-        stable = nst;
-    }
-    // Copy unstable entries
-    for (int i = 0; i < unstable_count; i++)
-    {
-        stable[j++] = unstable[i];
-    }
-    free(unstable);
     op->version = stable_count;
-    op->retval = stable_count+unstable_count;
-    op->buf = stable;
+    op->retval = res == 0 ? stable_count+unstable_count : -res;
+    op->buf = (uint8_t*)result;
     FINISH_OP(op);
 }
 
+void blockstore_impl_t::set_no_inode_stats(const std::vector<uint64_t> & pool_ids)
+{
+}
+
 void blockstore_impl_t::dump_diagnostics()
 {
-    journal.dump_diagnostics();
     flusher->dump_diagnostics();
 }
 
+void blockstore_meta_header_v3_t::set_crc32c()
+{
+    header_csum = 0;
+    uint32_t calc = crc32c(0, this, version == BLOCKSTORE_META_FORMAT_HEAP
+        ? sizeof(blockstore_meta_header_v3_t) : sizeof(blockstore_meta_header_v2_t));
+    header_csum = calc;
+}
+
 void blockstore_impl_t::disk_error_abort(const char *op, int retval, int expected)
 {
     if (retval == -EAGAIN)
@@ -741,85 +373,18 @@ void blockstore_impl_t::disk_error_abort(const char *op, int retval, int expecte
     exit(1);
 }
 
-void blockstore_impl_t::set_no_inode_stats(const std::vector<uint64_t> & pool_ids)
+uint64_t blockstore_impl_t::get_free_block_count()
 {
-    for (auto & np: no_inode_stats)
-    {
-        np.second = 2;
-    }
-    for (auto pool_id: pool_ids)
-    {
-        if (!no_inode_stats[pool_id])
-            recalc_inode_space_stats(pool_id, false);
-        no_inode_stats[pool_id] = 1;
-    }
-    for (auto np_it = no_inode_stats.begin(); np_it != no_inode_stats.end(); )
-    {
-        if (np_it->second == 2)
-        {
-            recalc_inode_space_stats(np_it->first, true);
-            no_inode_stats.erase(np_it++);
-        }
-        else
-            np_it++;
-    }
+    return dsk.block_count - heap->get_data_used_space()/dsk.data_block_size;
 }
 
-void blockstore_impl_t::recalc_inode_space_stats(uint64_t pool_id, bool per_inode)
+std::string blockstore_impl_t::get_op_diag(blockstore_op_t *op)
 {
-    auto sp_begin = inode_space_stats.lower_bound((pool_id << (64-POOL_ID_BITS)));
-    auto sp_end = inode_space_stats.lower_bound(((pool_id+1) << (64-POOL_ID_BITS)));
-    inode_space_stats.erase(sp_begin, sp_end);
-    auto sh_it = clean_db_shards.lower_bound((pool_id << (64-POOL_ID_BITS)));
-    while (sh_it != clean_db_shards.end() &&
-        (sh_it->first >> (64-POOL_ID_BITS)) == pool_id)
-    {
-        for (auto & pair: sh_it->second)
-        {
-            uint64_t space_id = per_inode ? pair.first.inode : (pool_id << (64-POOL_ID_BITS));
-            inode_space_stats[space_id] += dsk.data_block_size;
-        }
-        sh_it++;
-    }
-    object_id last_oid = {};
-    bool last_exists = false;
-    auto dirty_it = dirty_db.lower_bound((obj_ver_id){ .oid = { .inode = (pool_id << (64-POOL_ID_BITS)) } });
-    while (dirty_it != dirty_db.end() && (dirty_it->first.oid.inode >> (64-POOL_ID_BITS)) == pool_id)
-    {
-        if (IS_STABLE(dirty_it->second.state) && (IS_BIG_WRITE(dirty_it->second.state) || IS_DELETE(dirty_it->second.state)))
-        {
-            bool exists = false;
-            if (last_oid == dirty_it->first.oid)
-            {
-                exists = last_exists;
-            }
-            else
-            {
-                auto & clean_db = clean_db_shard(dirty_it->first.oid);
-                auto clean_it = clean_db.find(dirty_it->first.oid);
-                exists = clean_it != clean_db.end();
-            }
-            uint64_t space_id = per_inode ? dirty_it->first.oid.inode : (pool_id << (64-POOL_ID_BITS));
-            if (IS_BIG_WRITE(dirty_it->second.state))
-            {
-                if (!exists)
-                    inode_space_stats[space_id] += dsk.data_block_size;
-                last_exists = true;
-            }
-            else
-            {
-                if (exists)
-                {
-                    auto & sp = inode_space_stats[space_id];
-                    if (sp > dsk.data_block_size)
-                        sp -= dsk.data_block_size;
-                    else
-                        inode_space_stats.erase(space_id);
-                }
-                last_exists = false;
-            }
-            last_oid = dirty_it->first.oid;
-        }
-        dirty_it++;
-    }
+    char buf[256];
+    auto priv = PRIV(op);
+    if (priv->wait_for)
+        snprintf(buf, sizeof(buf), "state=%d wait=%d (detail=%ju)", priv->op_state, priv->wait_for, priv->wait_detail);
+    else
+        snprintf(buf, sizeof(buf), "state=%d", priv->op_state);
+    return std::string(buf);
 }

src/blockstore/blockstore_impl.h

@@ -5,6 +5,8 @@
 
 #include "blockstore.h"
 #include "blockstore_disk.h"
+#include "blockstore_heap.h"
+#include "ondisk_formats.h"
 
 #include <sys/types.h>
 #include <sys/ioctl.h>
@@ -19,241 +21,75 @@
 #include <deque>
 #include <new>
 #include <unordered_map>
-
-#include "cpp-btree/btree_map.h"
+#include <unordered_set>
 
 #include "malloc_or_die.h"
-#include "allocator.h"
+
+class blockstore_impl_t;
 
 //#define BLOCKSTORE_DEBUG
 
-// States are not stored on disk. Instead, they're deduced from the journal
-
-#define BS_ST_SMALL_WRITE 0x01
-#define BS_ST_BIG_WRITE 0x02
-#define BS_ST_DELETE 0x03
-
-#define BS_ST_WAIT_DEL 0x10
-#define BS_ST_WAIT_BIG 0x20
-#define BS_ST_IN_FLIGHT 0x30
-#define BS_ST_SUBMITTED 0x40
-#define BS_ST_WRITTEN 0x50
-#define BS_ST_SYNCED 0x60
-#define BS_ST_STABLE 0x70
-
-#define BS_ST_INSTANT 0x100
-
-#define IMMEDIATE_NONE 0
-#define IMMEDIATE_SMALL 1
-#define IMMEDIATE_ALL 2
-
-#define BS_ST_TYPE_MASK 0x0F
-#define BS_ST_WORKFLOW_MASK 0xF0
-#define IS_IN_FLIGHT(st) (((st) & 0xF0) <= BS_ST_SUBMITTED)
-#define IS_STABLE(st) (((st) & 0xF0) == BS_ST_STABLE)
-#define IS_SYNCED(st) (((st) & 0xF0) >= BS_ST_SYNCED)
-#define IS_JOURNAL(st) (((st) & 0x0F) == BS_ST_SMALL_WRITE)
-#define IS_BIG_WRITE(st) (((st) & 0x0F) == BS_ST_BIG_WRITE)
-#define IS_DELETE(st) (((st) & 0x0F) == BS_ST_DELETE)
-#define IS_INSTANT(st) (((st) & BS_ST_TYPE_MASK) == BS_ST_DELETE || ((st) & BS_ST_INSTANT))
-
-#define BS_SUBMIT_CHECK_SQES(n) \
-    if (ringloop->sqes_left() < (n))\
-    {\
-        /* Pause until there are more requests available */\
-        PRIV(op)->wait_detail = (n);\
-        PRIV(op)->wait_for = WAIT_SQE;\
-        return 0;\
-    }
-
-#define BS_SUBMIT_GET_SQE(sqe, data) \
-    BS_SUBMIT_GET_ONLY_SQE(sqe); \
-    struct ring_data_t *data = ((ring_data_t*)sqe->user_data)
-
-#define BS_SUBMIT_GET_ONLY_SQE(sqe) \
-    struct io_uring_sqe *sqe = get_sqe();\
-    if (!sqe)\
-    {\
-        /* Pause until there are more requests available */\
-        PRIV(op)->wait_detail = 1;\
-        PRIV(op)->wait_for = WAIT_SQE;\
-        return 0;\
-    }
-
-#define BS_SUBMIT_GET_SQE_DECL(sqe) \
-    sqe = get_sqe();\
-    if (!sqe)\
-    {\
-        /* Pause until there are more requests available */\
-        PRIV(op)->wait_detail = 1;\
-        PRIV(op)->wait_for = WAIT_SQE;\
-        return 0;\
-    }
-
-#include "blockstore_journal.h"
-
-// "VITAstor"
-#define BLOCKSTORE_META_MAGIC_V1 0x726F747341544956l
-#define BLOCKSTORE_META_FORMAT_V1 1
-#define BLOCKSTORE_META_FORMAT_V2 2
-
-// metadata header (superblock)
-struct __attribute__((__packed__)) blockstore_meta_header_v1_t
-{
-    uint64_t zero;
-    uint64_t magic;
-    uint64_t version;
-    uint32_t meta_block_size;
-    uint32_t data_block_size;
-    uint32_t bitmap_granularity;
-};
-
-struct __attribute__((__packed__)) blockstore_meta_header_v2_t
-{
-    uint64_t zero;
-    uint64_t magic;
-    uint64_t version;
-    uint32_t meta_block_size;
-    uint32_t data_block_size;
-    uint32_t bitmap_granularity;
-    uint32_t data_csum_type;
-    uint32_t csum_block_size;
-    uint32_t header_csum;
-};
-
-// 32 bytes = 24 bytes + block bitmap (4 bytes by default) + external attributes (also bitmap, 4 bytes by default)
-// per "clean" entry on disk with fixed metadata tables
-struct __attribute__((__packed__)) clean_disk_entry
-{
-    object_id oid;
-    uint64_t version;
-    uint8_t bitmap[];
-    // Two more fields come after bitmap in metadata version 2:
-    // uint32_t data_csum[];
-    // uint32_t entry_csum;
-};
-
-// 32 = 16 + 16 bytes per "clean" entry in memory (object_id => clean_entry)
-struct __attribute__((__packed__)) clean_entry
-{
-    uint64_t version;
-    uint64_t location;
-};
-
-// 64 = 24 + 40 bytes per dirty entry in memory (obj_ver_id => dirty_entry). Plus checksums
-struct __attribute__((__packed__)) dirty_entry
-{
-    uint32_t state;
-    uint32_t flags;    // unneeded, but present for alignment
-    uint64_t location; // location in either journal or data -> in BYTES
-    uint32_t offset;   // data offset within object (stripe)
-    uint32_t len;      // data length
-    uint64_t journal_sector; // journal sector used for this entry
-    void* dyn_data;    // dynamic data: external bitmap and data block checksums. may be a pointer to the in-memory journal
-};
-
 // - Sync must be submitted after previous writes/deletes (not before!)
-// - Reads to the same object must be submitted after previous writes/deletes
-//   are written (not necessarily synced) in their location. This is because we
-//   rely on read-modify-write for erasure coding and we must return new data
-//   to calculate parity for subsequent writes
+// - Reads may be submitted in parallel with writes/deletes because we use MVCC
 // - Writes may be submitted in any order, because they don't overlap. Each write
 //   goes into a new location - either on the journal device or on the data device
 // - Stable (stabilize) must be submitted after sync of that object is completed
 //   It's even OK to return an error to the caller if that object is not synced yet
-// - Journal trim may be processed only after all versions are moved to
-//   the main storage AND after all read operations for older versions complete
+// - compacted_lsn should be moved forward only after all versions are moved to the main storage
 // - If an operation can not be submitted because the ring is full
 //   we should stop submission of other operations. Otherwise some "scatter" reads
 //   may end up blocked for a long time.
-// Otherwise, the submit order is free, that is all operations may be submitted immediately
-// In fact, adding a write operation must immediately result in dirty_db being populated
-
-// Suspend operation until there are more free SQEs
-#define WAIT_SQE 1
-// Suspend operation until there are <wait_detail> bytes of free space in the journal on disk
-#define WAIT_JOURNAL 3
-// Suspend operation until the next journal sector buffer is free
-#define WAIT_JOURNAL_BUFFER 4
-// Suspend operation until there is some free space on the data device
-#define WAIT_FREE 5
-
-struct used_clean_obj_t
-{
-    int refs;
-    bool was_freed; // was freed by a parallel flush?
-    bool was_changed; // was changed by a parallel flush?
-};
-
-// https://github.com/algorithm-ninja/cpp-btree
-// https://github.com/greg7mdp/sparsepp/ was used previously, but it was TERRIBLY slow after resizing
-// with sparsepp, random reads dropped to ~700 iops very fast with just as much as ~32k objects in the DB
-typedef btree::btree_map<object_id, clean_entry> blockstore_clean_db_t;
-typedef std::map<obj_ver_id, dirty_entry> blockstore_dirty_db_t;
+// Otherwise, the submission order is free.
 
 #include "blockstore_init.h"
 
 #include "blockstore_flush.h"
 
-#define PRIV(op) ((blockstore_op_private_t*)(op)->private_data)
-#define FINISH_OP(op) PRIV(op)->~blockstore_op_private_t(); std::function<void (blockstore_op_t*)>(op->callback)(op)
-
 struct blockstore_op_private_t
 {
     // Wait status
     int wait_for;
-    uint64_t wait_detail, wait_detail2;
+    uint64_t wait_detail;
     int pending_ops;
     int op_state;
 
+    // Read, write, sync, stabilize
+    uint64_t lsn;
+
     // Read
-    uint64_t clean_block_used;
     std::vector<copy_buffer_t> read_vec;
 
-    // Sync, write
-    uint64_t min_flushed_journal_sector, max_flushed_journal_sector;
+    // Write
+    uint64_t location;
+    bool is_big;
+
+    // Stabilize, rollback
+    int stab_pos;
+
+    // Stabilize
+    uint64_t to_lsn;
 
     // Write
     struct iovec iov_zerofill[3];
-    // Warning: must not have a default value here because it's written to before calling constructor in blockstore_write.cpp O_o
-    uint64_t real_version;
     timespec tv_begin;
-
-    // Sync
-    std::vector<obj_ver_id> sync_big_writes, sync_small_writes;
 };
 
-typedef uint32_t pool_id_t;
-typedef uint64_t pool_pg_id_t;
-
-#define POOL_ID_BITS 16
-
-struct pool_shard_settings_t
-{
-    uint32_t pg_count;
-    uint32_t pg_stripe_size;
-};
-
-#define STAB_SPLIT_DONE 1
-#define STAB_SPLIT_WAIT 2
-#define STAB_SPLIT_SYNC 3
-#define STAB_SPLIT_TODO 4
-
-class blockstore_impl_t
+class blockstore_impl_t: public blockstore_i
 {
+public:
     blockstore_disk_t dsk;
 
     /******* OPTIONS *******/
     bool readonly = false;
-    // It is safe to disable fsync() if drive write cache is writethrough
-    bool disable_data_fsync = false, disable_meta_fsync = false, disable_journal_fsync = false;
     // Enable if you want every operation to be executed with an "implicit fsync"
     // Suitable only for server SSDs with capacitors, requires disabled data and journal fsyncs
     int immediate_commit = IMMEDIATE_NONE;
     bool inmemory_meta = false;
+    uint32_t meta_write_recheck_parallelism = 0;
     // Maximum and minimum flusher count
-    unsigned max_flusher_count, min_flusher_count;
-    unsigned journal_trim_interval;
+    unsigned max_flusher_count = 0, min_flusher_count = 0;
+    unsigned journal_trim_interval = 0;
+    unsigned flusher_start_threshold = 0;
     // Maximum queue depth
     unsigned max_write_iodepth = 128;
     // Enable small (journaled) write throttling, useful for the SSD+HDD case
@@ -268,141 +104,92 @@ class blockstore_impl_t
     uint64_t autosync_writes = 128;
     // Log level (0-10)
     int log_level = 0;
+    // Enable correct block checksum validation on objects updated with small writes when checksum block
+    // is larger than bitmap_granularity, at the expense of extra metadata fsyncs during compaction
+    bool perfect_csum_update = false;
     /******* END OF OPTIONS *******/
 
     struct ring_consumer_t ring_consumer;
 
-    std::map<pool_id_t, pool_shard_settings_t> clean_db_settings;
-    std::map<pool_pg_id_t, blockstore_clean_db_t> clean_db_shards;
-    std::map<uint64_t, int> no_inode_stats;
-    uint8_t *clean_bitmaps = NULL;
-    blockstore_dirty_db_t dirty_db;
+    blockstore_heap_t *heap = NULL;
+    uint8_t* meta_superblock = NULL;
+    uint8_t *buffer_area = NULL;
     std::vector<blockstore_op_t*> submit_queue;
-    std::vector<obj_ver_id> unsynced_big_writes, unsynced_small_writes;
-    int unsynced_big_write_count = 0, unstable_unsynced = 0;
+    int unsynced_big_write_count = 0, unsynced_small_write_count = 0, unsynced_meta_write_count = 0;
     int unsynced_queued_ops = 0;
-    allocator_t *data_alloc = NULL;
-    uint64_t used_blocks = 0;
     uint8_t *zero_object = NULL;
 
-    void *metadata_buffer = NULL;
-
-    struct journal_t journal;
     journal_flusher_t *flusher;
-    int big_to_flush = 0;
     int write_iodepth = 0;
-    bool alloc_dyn_data = false;
-
-    // clean data blocks referenced by read operations
-    std::map<uint64_t, used_clean_obj_t> used_clean_objects;
+    int inflight_big = 0;
+    bool fsyncing_data = false;
 
     bool live = false, queue_stall = false;
-    ring_loop_t *ringloop;
-    timerfd_manager_t *tfd;
+    ring_loop_i *ringloop = NULL;
+    timerfd_manager_t *tfd = NULL;
 
-    bool stop_sync_submitted;
+    bool stop_sync_submitted = false;
 
     inline struct io_uring_sqe* get_sqe()
     {
         return ringloop->get_sqe();
     }
 
-    friend class blockstore_init_meta;
-    friend class blockstore_init_journal;
-    friend struct blockstore_journal_check_t;
-    friend class journal_flusher_t;
-    friend class journal_flusher_co;
-
-    void calc_lengths();
     void open_data();
     void open_meta();
     void open_journal();
-    uint8_t* get_clean_entry_bitmap(uint64_t block_loc, int offset);
 
-    blockstore_clean_db_t& clean_db_shard(object_id oid);
-    void reshard_clean_db(pool_id_t pool_id, uint32_t pg_count, uint32_t pg_stripe_size);
-    void recalc_inode_space_stats(uint64_t pool_id, bool per_inode);
-
-    // Journaling
-    void prepare_journal_sector_write(int sector, blockstore_op_t *op);
-    void handle_journal_write(ring_data_t *data, uint64_t flush_id);
     void disk_error_abort(const char *op, int retval, int expected);
 
     // Asynchronous init
     int initialized;
     int metadata_buf_size;
     blockstore_init_meta* metadata_init_reader;
-    blockstore_init_journal* journal_init_reader;
 
+    void init();
     void check_wait(blockstore_op_t *op);
     void init_op(blockstore_op_t *op);
 
     // Read
-    int dequeue_read(blockstore_op_t *read_op);
+    int dequeue_read(blockstore_op_t *op);
+    int fulfill_read(blockstore_op_t *op);
+    uint32_t prepare_read(std::vector<copy_buffer_t> & read_vec, heap_object_t *obj, heap_write_t *wr, uint32_t start, uint32_t end);
+    uint32_t prepare_read_with_bitmaps(std::vector<copy_buffer_t> & read_vec, heap_object_t *obj, heap_write_t *wr, uint32_t start, uint32_t end);
+    uint32_t prepare_read_zero(std::vector<copy_buffer_t> & read_vec, uint32_t start, uint32_t end);
+    uint32_t prepare_read_simple(std::vector<copy_buffer_t> & read_vec, heap_object_t *obj, heap_write_t *wr, uint32_t start, uint32_t end);
+    void prepare_disk_read(std::vector<copy_buffer_t> & read_vec, int pos, heap_object_t *obj, heap_write_t *wr,
+        uint32_t blk_start, uint32_t blk_end, uint32_t start, uint32_t end, uint32_t copy_flags);
     void find_holes(std::vector<copy_buffer_t> & read_vec, uint32_t item_start, uint32_t item_end,
-        std::function<int(int, bool, uint32_t, uint32_t)> callback);
-    int fulfill_read(blockstore_op_t *read_op,
-        uint64_t &fulfilled, uint32_t item_start, uint32_t item_end,
-        uint32_t item_state, uint64_t item_version, uint64_t item_location,
-        uint64_t journal_sector, uint8_t *csum, int *dyn_data);
-    bool fulfill_clean_read(blockstore_op_t *read_op, uint64_t & fulfilled,
-        uint8_t *clean_entry_bitmap, int *dyn_data,
-        uint32_t item_start, uint32_t item_end, uint64_t clean_loc, uint64_t clean_ver);
-    int fill_partial_checksum_blocks(std::vector<copy_buffer_t> & rv, uint64_t & fulfilled,
-        uint8_t *clean_entry_bitmap, int *dyn_data, bool from_journal, uint8_t *read_buf, uint64_t read_offset, uint64_t read_end);
-    int pad_journal_read(std::vector<copy_buffer_t> & rv, copy_buffer_t & cp,
-        uint64_t dirty_offset, uint64_t dirty_end, uint64_t dirty_loc, uint8_t *csum_ptr, int *dyn_data,
-        uint64_t offset, uint64_t submit_len, uint64_t & blk_begin, uint64_t & blk_end, uint8_t* & blk_buf);
-    bool read_range_fulfilled(std::vector<copy_buffer_t> & rv, uint64_t & fulfilled, uint8_t *read_buf,
-        uint8_t *clean_entry_bitmap, uint32_t item_start, uint32_t item_end);
-    bool read_checksum_block(blockstore_op_t *op, int rv_pos, uint64_t &fulfilled, uint64_t clean_loc);
-    uint8_t* read_clean_meta_block(blockstore_op_t *read_op, uint64_t clean_loc, int rv_pos);
-    bool verify_padded_checksums(uint8_t *clean_entry_bitmap, uint8_t *csum_buf, uint32_t offset,
-        iovec *iov, int n_iov, std::function<void(uint32_t, uint32_t, uint32_t)> bad_block_cb);
-    bool verify_journal_checksums(uint8_t *csums, uint32_t offset,
-        iovec *iov, int n_iov, std::function<void(uint32_t, uint32_t, uint32_t)> bad_block_cb);
-    bool verify_clean_padded_checksums(blockstore_op_t *op, uint64_t clean_loc, uint8_t *dyn_data, bool from_journal,
-        iovec *iov, int n_iov, std::function<void(uint32_t, uint32_t, uint32_t)> bad_block_cb);
-    int fulfill_read_push(blockstore_op_t *op, void *buf, uint64_t offset, uint64_t len,
-        uint32_t item_state, uint64_t item_version);
+        std::function<void(int&, uint32_t, uint32_t)> callback);
+    void free_read_buffers(std::vector<copy_buffer_t> & rv);
     void handle_read_event(ring_data_t *data, blockstore_op_t *op);
+    bool verify_read_checksums(blockstore_op_t *op);
 
     // Write
     bool enqueue_write(blockstore_op_t *op);
-    void cancel_all_writes(blockstore_op_t *op, blockstore_dirty_db_t::iterator dirty_it, int retval);
+    void prepare_meta_block_write(blockstore_op_t *op, uint64_t modified_block, io_uring_sqe *sqe = NULL);
     int dequeue_write(blockstore_op_t *op);
-    int dequeue_del(blockstore_op_t *op);
+    int make_big_write(blockstore_op_t *op, uint32_t offset, uint32_t len, uint32_t *modified_block, uint32_t *moved_from_block);
     int continue_write(blockstore_op_t *op);
-    void release_journal_sectors(blockstore_op_t *op);
     void handle_write_event(ring_data_t *data, blockstore_op_t *op);
 
     // Sync
     int continue_sync(blockstore_op_t *op);
-    void ack_sync(blockstore_op_t *op);
+    bool submit_fsyncs(int & wait_count);
+    int do_sync(blockstore_op_t *op, int base_state);
 
     // Stabilize
     int dequeue_stable(blockstore_op_t *op);
-    int continue_stable(blockstore_op_t *op);
-    void mark_stable(obj_ver_id ov, bool forget_dirty = false);
-    void stabilize_object(object_id oid, uint64_t max_ver);
-    blockstore_op_t* selective_sync(blockstore_op_t *op);
-    int split_stab_op(blockstore_op_t *op, std::function<int(obj_ver_id v)> decider);
-
-    // Rollback
-    int dequeue_rollback(blockstore_op_t *op);
-    int continue_rollback(blockstore_op_t *op);
-    void mark_rolled_back(const obj_ver_id & ov);
-    void erase_dirty(blockstore_dirty_db_t::iterator dirty_start, blockstore_dirty_db_t::iterator dirty_end, uint64_t clean_loc);
-    void free_dirty_dyn_data(dirty_entry & e);
 
     // List
     void process_list(blockstore_op_t *op);
 
-public:
+/*public:*/
 
-    blockstore_impl_t(blockstore_config_t & config, ring_loop_t *ringloop, timerfd_manager_t *tfd);
+    blockstore_impl_t(blockstore_config_t & config, ring_loop_i *ringloop, timerfd_manager_t *tfd, bool mock_mode = false);
     ~blockstore_impl_t();
 
+    void parse_config(blockstore_config_t & config);
     void parse_config(blockstore_config_t & config, bool init);
 
     // Event loop
@@ -426,21 +213,19 @@ public:
     // Simplified synchronous operation: get object bitmap & current version
     int read_bitmap(object_id oid, uint64_t target_version, void *bitmap, uint64_t *result_version = NULL);
 
-    // Unstable writes are added here (map of object_id -> version)
-    std::unordered_map<object_id, uint64_t> unstable_writes;
-
-    // Space usage statistics
-    std::map<uint64_t, uint64_t> inode_space_stats;
-
     // Set per-pool no_inode_stats
     void set_no_inode_stats(const std::vector<uint64_t> & pool_ids);
 
     // Print diagnostics to stdout
     void dump_diagnostics();
 
+    // Get diagnostic string for an operation
+    std::string get_op_diag(blockstore_op_t *op);
+
+    const std::map<uint64_t, uint64_t> & get_inode_space_stats() { return heap->get_inode_space_stats(); }
     inline uint32_t get_block_size() { return dsk.data_block_size; }
     inline uint64_t get_block_count() { return dsk.block_count; }
-    inline uint64_t get_free_block_count() { return dsk.block_count - used_blocks; }
+    uint64_t get_free_block_count();
     inline uint32_t get_bitmap_granularity() { return dsk.disk_alignment; }
     inline uint64_t get_journal_size() { return dsk.journal_len; }
 };