Small fix due to the new functionality in cinder "Skip sparse copy during volume reimage" 8d7e292bcd

Add libvirt 10.4 patch (same as 9.10 actually)
Fix possible infinite loop in flusher (surprisingly reproduced in test_write.sh with iothreads)
2024-06-27 11:45:05 +03:00 · 2024-06-27 01:35:29 +03:00 · 2024-06-27 00:38:01 +03:00 · 2024-06-20 02:11:53 +03:00 · 2024-06-19 00:28:26 +03:00 · 2024-06-19 00:28:26 +03:00
527 changed files with 100947 additions and 13963 deletions
--- a/.dockerignore
+++ b/.dockerignore
@ -0,0 +1,19 @@
 .git
 build
 packages
 mon/node_modules
 *.o
 *.so
 osd
 stub_osd
 stub_uring_osd
 stub_bench
 osd_test
 dump_journal
 nbd_proxy
 rm_inode
 fio
 qemu
 rpm/*.Dockerfile
 debian/*.Dockerfile
 Dockerfile
--- a/.gitea/workflows/buildenv.Dockerfile
+++ b/.gitea/workflows/buildenv.Dockerfile
@ -0,0 +1,36 @@
 FROM node:16-bullseye
 WORKDIR /root
 ADD ./docker/vitastor.gpg /etc/apt/trusted.gpg.d
 RUN echo 'deb http://deb.debian.org/debian bullseye-backports main' >> /etc/apt/sources.list; \
    echo 'deb http://vitastor.io/debian bullseye main' >> /etc/apt/sources.list; \
    echo >> /etc/apt/preferences; \
    echo 'Package: *' >> /etc/apt/preferences; \
    echo 'Pin: release a=bullseye-backports' >> /etc/apt/preferences; \
    echo 'Pin-Priority: 500' >> /etc/apt/preferences; \
    echo >> /etc/apt/preferences; \
    echo 'Package: *' >> /etc/apt/preferences; \
    echo 'Pin: origin "vitastor.io"' >> /etc/apt/preferences; \
    echo 'Pin-Priority: 1000' >> /etc/apt/preferences; \
    grep '^deb ' /etc/apt/sources.list | perl -pe 's/^deb/deb-src/' >> /etc/apt/sources.list; \
    echo 'APT::Install-Recommends false;' >> /etc/apt/apt.conf; \
    echo 'APT::Install-Suggests false;' >> /etc/apt/apt.conf
 RUN apt-get update
 RUN apt-get -y install etcd qemu-system-x86 qemu-block-extra qemu-utils fio libasan5 \
    liburing1 liburing-dev libgoogle-perftools-dev devscripts libjerasure-dev cmake libibverbs-dev libisal-dev
 RUN apt-get -y build-dep fio qemu=`dpkg -s qemu-system-x86|grep ^Version:|awk '{print $2}'`
 RUN apt-get -y install jq lp-solve sudo nfs-common
 RUN apt-get --download-only source fio qemu=`dpkg -s qemu-system-x86|grep ^Version:|awk '{print $2}'`
 RUN set -ex; \
    mkdir qemu-build; \
    cd qemu-build; \
    dpkg-source -x /root/qemu*.dsc; \
    cd qemu*/; \
    debian/rules configure-qemu || debian/rules b/configure-stamp; \
    cd b/qemu; \
    make -j8 config-poison.h || true; \
    make -j8 qapi/qapi-builtin-types.h
--- a/.gitea/workflows/test.Dockerfile
+++ b/.gitea/workflows/test.Dockerfile
@ -0,0 +1,19 @@
 FROM git.yourcmc.ru/vitalif/vitastor/buildenv
 ADD . /root/vitastor
 RUN set -e -x; \
    mkdir -p /root/fio-build/; \
    cd /root/fio-build/; \
    dpkg-source -x /root/fio*.dsc; \
    cd /root/vitastor; \
    ln -s /root/fio-build/fio-*/ ./fio; \
    ln -s /root/qemu-build/qemu-*/ ./qemu; \
    ls /usr/include/linux/raw.h || cp ./debian/raw.h /usr/include/linux/raw.h; \
    cd mon; \
    npm install; \
    cd ..; \
    mkdir build; \
    cd build; \
    cmake .. -DWITH_ASAN=yes -DWITH_QEMU=yes; \
    make -j16
--- a/.gitea/workflows/test.yml
+++ b/.gitea/workflows/test.yml
@ -0,0 +1,991 @@
 name: Test
 on:
  push:
    branches:
    - '*'
    paths:
    - '.gitea/**'
    - 'src/**'
    - 'mon/**'
    - 'json11'
    - 'cpp-btree'
    - 'tests/**'
 env:
  BUILDENV_IMAGE: git.yourcmc.ru/vitalif/vitastor/buildenv
  TEST_IMAGE: git.yourcmc.ru/vitalif/vitastor/test
  OSD_ARGS: '--etcd_quick_timeout 2000'
 concurrency:
  group: ci-${{ github.ref }}
  cancel-in-progress: true
 jobs:
  buildenv:
    runs-on: ubuntu-latest
    container: git.yourcmc.ru/vitalif/gitea-ci-dind
    steps:
    - uses: actions/checkout@v3
    - name: Build and push
      run: |
        set -ex
        if ! docker manifest inspect $BUILDENV_IMAGE >/dev/null; then
          docker build -t $BUILDENV_IMAGE -f .gitea/workflows/buildenv.Dockerfile .
          docker login git.yourcmc.ru -u vitalif -p "${{secrets.TOKEN}}"
          docker push $BUILDENV_IMAGE
        fi
  build:
    runs-on: ubuntu-latest
    needs: buildenv
    container: git.yourcmc.ru/vitalif/gitea-ci-dind
    steps:
    - uses: actions/checkout@v3
      with:
        submodules: true
    - name: Build and push
      run: |
        set -ex
        if ! docker manifest inspect $TEST_IMAGE:$GITHUB_SHA >/dev/null; then
          docker build -t $TEST_IMAGE:$GITHUB_SHA -f .gitea/workflows/test.Dockerfile .
          docker login git.yourcmc.ru -u vitalif -p "${{secrets.TOKEN}}"
          docker push $TEST_IMAGE:$GITHUB_SHA
        fi
  make_test:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    # leak sanitizer sometimes crashes
    - run: cd /root/vitastor/build && ASAN_OPTIONS=detect_leaks=0 make -j16 test
  npm_lint:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - run: cd /root/vitastor/mon && npm run lint
  test_add_osd:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 10
      run: /root/vitastor/tests/test_add_osd.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_cas:
    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_cas.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_count:
    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.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_count_ec:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 3
      run: SCHEME=ec /root/vitastor/tests/test_change_pg_count.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
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 3
      run: /root/vitastor/tests/test_change_pg_size.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_create_nomaxid:
    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_create_nomaxid.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_etcd_fail:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 10
      run: /root/vitastor/tests/test_etcd_fail.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_interrupted_rebalance:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 10
      run: /root/vitastor/tests/test_interrupted_rebalance.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_interrupted_rebalance_imm:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 10
      run: IMMEDIATE_COMMIT=1 /root/vitastor/tests/test_interrupted_rebalance.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_interrupted_rebalance_ec:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 10
      run: SCHEME=ec /root/vitastor/tests/test_interrupted_rebalance.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_interrupted_rebalance_ec_imm:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 10
      run: SCHEME=ec IMMEDIATE_COMMIT=1 /root/vitastor/tests/test_interrupted_rebalance.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_failure_domain:
    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_failure_domain.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:
    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.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_ec:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 3
      run: SCHEME=ec /root/vitastor/tests/test_snapshot.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_minsize_1:
    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_minsize_1.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_move_reappear:
    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_move_reappear.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
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 3
      run: /root/vitastor/tests/test_rm.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_chain:
    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_chain.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_chain_ec:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 6
      run: SCHEME=ec /root/vitastor/tests/test_snapshot_chain.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_down:
    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_down.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_down_ec:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 3
      run: SCHEME=ec /root/vitastor/tests/test_snapshot_down.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_splitbrain:
    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_splitbrain.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_rebalance_verify:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 10
      run: /root/vitastor/tests/test_rebalance_verify.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_rebalance_verify_imm:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 10
      run: IMMEDIATE_COMMIT=1 /root/vitastor/tests/test_rebalance_verify.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_rebalance_verify_ec:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 10
      run: SCHEME=ec /root/vitastor/tests/test_rebalance_verify.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_rebalance_verify_ec_imm:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 10
      run: SCHEME=ec IMMEDIATE_COMMIT=1 /root/vitastor/tests/test_rebalance_verify.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_root_node:
    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_root_node.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_switch_primary:
    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_switch_primary.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:
    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_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_xor:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 3
      run: SCHEME=xor /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
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 3
      run: /root/vitastor/tests/test_write_no_same.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_pg_size_2:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 10
      run: PG_SIZE=2 /root/vitastor/tests/test_heal.sh
    - name: Print logs
      if: always() && steps.test.outcome == 'failure'
      run: |
        for i in /root/vitastor/testdata/*.log /root/vitastor/testdata/*.txt; do
          echo "-------- $i --------"
          cat $i
          echo ""
        done
  test_heal_ec:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 10
      run: SCHEME=ec /root/vitastor/tests/test_heal.sh
    - name: Print logs
      if: always() && steps.test.outcome == 'failure'
      run: |
        for i in /root/vitastor/testdata/*.log /root/vitastor/testdata/*.txt; do
          echo "-------- $i --------"
          cat $i
          echo ""
        done
  test_heal_csum_32k_dmj:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 10
      run: TEST_NAME=csum_32k_dmj OSD_ARGS="--data_csum_type crc32c --csum_block_size 32k --inmemory_metadata false --inmemory_journal false" OFFSET_ARGS=$OSD_ARGS /root/vitastor/tests/test_heal.sh
    - name: Print logs
      if: always() && steps.test.outcome == 'failure'
      run: |
        for i in /root/vitastor/testdata/*.log /root/vitastor/testdata/*.txt; do
          echo "-------- $i --------"
          cat $i
          echo ""
        done
  test_heal_csum_32k_dj:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 10
      run: TEST_NAME=csum_32k_dj  OSD_ARGS="--data_csum_type crc32c --csum_block_size 32k --inmemory_journal false" OFFSET_ARGS=$OSD_ARGS /root/vitastor/tests/test_heal.sh
    - name: Print logs
      if: always() && steps.test.outcome == 'failure'
      run: |
        for i in /root/vitastor/testdata/*.log /root/vitastor/testdata/*.txt; do
          echo "-------- $i --------"
          cat $i
          echo ""
        done
  test_heal_csum_32k:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 10
      run: TEST_NAME=csum_32k     OSD_ARGS="--data_csum_type crc32c --csum_block_size 32k" OFFSET_ARGS=$OSD_ARGS /root/vitastor/tests/test_heal.sh
    - name: Print logs
      if: always() && steps.test.outcome == 'failure'
      run: |
        for i in /root/vitastor/testdata/*.log /root/vitastor/testdata/*.txt; do
          echo "-------- $i --------"
          cat $i
          echo ""
        done
  test_heal_csum_4k_dmj:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 10
      run: TEST_NAME=csum_4k_dmj  OSD_ARGS="--data_csum_type crc32c --inmemory_metadata false --inmemory_journal false" OFFSET_ARGS=$OSD_ARGS /root/vitastor/tests/test_heal.sh
    - name: Print logs
      if: always() && steps.test.outcome == 'failure'
      run: |
        for i in /root/vitastor/testdata/*.log /root/vitastor/testdata/*.txt; do
          echo "-------- $i --------"
          cat $i
          echo ""
        done
  test_heal_csum_4k_dj:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 10
      run: TEST_NAME=csum_4k_dj   OSD_ARGS="--data_csum_type crc32c --inmemory_journal false" OFFSET_ARGS=$OSD_ARGS /root/vitastor/tests/test_heal.sh
    - name: Print logs
      if: always() && steps.test.outcome == 'failure'
      run: |
        for i in /root/vitastor/testdata/*.log /root/vitastor/testdata/*.txt; do
          echo "-------- $i --------"
          cat $i
          echo ""
        done
  test_heal_csum_4k:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 10
      run: TEST_NAME=csum_4k      OSD_ARGS="--data_csum_type crc32c" OFFSET_ARGS=$OSD_ARGS /root/vitastor/tests/test_heal.sh
    - name: Print logs
      if: always() && steps.test.outcome == 'failure'
      run: |
        for i in /root/vitastor/testdata/*.log /root/vitastor/testdata/*.txt; do
          echo "-------- $i --------"
          cat $i
          echo ""
        done
  test_osd_tags:
    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_osd_tags.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_enospc:
    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_enospc.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_enospc_xor:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 3
      run: SCHEME=xor /root/vitastor/tests/test_enospc.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_enospc_imm:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 3
      run: IMMEDIATE_COMMIT=1 /root/vitastor/tests/test_enospc.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_enospc_imm_xor:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 3
      run: IMMEDIATE_COMMIT=1 SCHEME=xor /root/vitastor/tests/test_enospc.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_scrub:
    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_scrub.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_scrub_zero_osd_2:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 3
      run: ZERO_OSD=2 /root/vitastor/tests/test_scrub.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_scrub_xor:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 3
      run: SCHEME=xor /root/vitastor/tests/test_scrub.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_scrub_pg_size_3:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 3
      run: PG_SIZE=3 /root/vitastor/tests/test_scrub.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_scrub_pg_size_6_pg_minsize_4_osd_count_6_ec:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 3
      run: PG_SIZE=6 PG_MINSIZE=4 OSD_COUNT=6 SCHEME=ec /root/vitastor/tests/test_scrub.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_scrub_ec:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 3
      run: SCHEME=ec /root/vitastor/tests/test_scrub.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_nfs:
    runs-on: ubuntu-latest
    needs: build
    container: ${{env.TEST_IMAGE}}:${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: 3
      run: /root/vitastor/tests/test_nfs.sh
    - name: Print logs
      if: always() && steps.test.outcome == 'failure'
      run: |
        for i in /root/vitastor/testdata/*.log /root/vitastor/testdata/*.txt; do
          echo "-------- $i --------"
          cat $i
          echo ""
        done
--- a/.gitea/workflows/tests-to-yaml.pl
+++ b/.gitea/workflows/tests-to-yaml.pl
@ -0,0 +1,79 @@
 #!/usr/bin/perl
 use strict;
 for my $line (<>)
 {
    if ($line =~ /\.\/(test_[^\.]+)/s)
    {
        chomp $line;
        my $base_name = $1;
        my $test_name = $base_name;
        my $timeout = 3;
        if ($test_name eq 'test_etcd_fail' || $test_name eq 'test_heal' || $test_name eq 'test_add_osd' ||
            $test_name eq 'test_interrupted_rebalance' || $test_name eq 'test_rebalance_verify')
        {
            $timeout = 10;
        }
        while ($line =~ /([^\s=]+)=(\S+)/gs)
        {
            if ($1 eq 'TEST_NAME')
            {
                $test_name = $base_name.'_'.$2;
                last;
            }
            elsif ($1 eq 'SCHEME' && $2 eq 'ec')
            {
                $test_name .= '_ec';
            }
            elsif ($1 eq 'SCHEME' && $2 eq 'xor')
            {
                $test_name .= '_xor';
            }
            elsif ($1 eq 'IMMEDIATE_COMMIT')
            {
                $test_name .= '_imm';
            }
            else
            {
                $test_name .= '_'.lc($1).'_'.$2;
            }
        }
        if ($test_name eq 'test_snapshot_chain_ec')
        {
            $timeout = 6;
        }
        $line =~ s!\./test_!/root/vitastor/tests/test_!;
        # Gitea CI doesn't support artifacts yet, lol
        #- name: Upload results
        #  uses: actions/upload-artifact\@v3
        #  if: always()
        #  with:
        #    name: ${test_name}_result
        #    path: |
        #      /root/vitastor/testdata
        #      !/root/vitastor/testdata/*.bin
        #    retention-days: 5
        print <<"EOF"
  $test_name:
    runs-on: ubuntu-latest
    needs: build
    container: \${{env.TEST_IMAGE}}:\${{github.sha}}
    steps:
    - name: Run test
      id: test
      timeout-minutes: $timeout
      run: $line
    - 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
 EOF
 ;
    }
 }
--- a/.gitignore
+++ b/.gitignore
@ -0,0 +1,5 @@
 *.o
 *.so
 package-lock.json
 fio
 qemu
--- a/.gitmodules
+++ b/.gitmodules
@ -0,0 +1,6 @@
 [submodule "cpp-btree"]
 	path = cpp-btree
 	url = ../cpp-btree.git
 [submodule "json11"]
 	path = json11
 	url = ../json11.git
--- a/CLA-en.md
+++ b/CLA-en.md
@ -0,0 +1,115 @@
 ## Contributor License Agreement
 > This Agreement is made in the Russian and English languages. **The English
 text of Agreement is for informational purposes only** and is not binding
 for the Parties.
 >
 > In the event of a conflict between the provisions of the Russian and
 English versions of this Agreement, the **Russian version shall prevail**.
 >
 > Russian version is published at https://git.yourcmc.ru/vitalif/vitastor/src/branch/master/CLA-ru.md
 This document represents the offer of Filippov Vitaliy Vladimirovich
 ("Author"), author and copyright holder of Vitastor software ("Program"),
 acknowledged by a certificate of Federal Service for Intellectual
 Property of Russian Federation (Rospatent) # 2021617829 dated 20 May 2021,
 to "Contributors" to conclude this license agreement as follows
 ("Agreement" or "Offer").
 In accordance with Art. 435, Art. 438 of the Civil Code of the Russian
 Federation, this Agreement is an offer and in case of acceptance of the
 offer, an agreement is considered concluded on the conditions specified
 in the offer.
 1. Applicable Terms. \
   1.1. "Official Repository" shall mean the computer storage, operated by
        the Author, containing all prior and future versions of the Source
        Code of the Program, at Internet addresses https://git.yourcmc.ru/vitalif/vitastor/
        or https://github.com/vitalif/vitastor/. \
   1.2. "Contributions" shall mean results of intellectual activity
        (including, but not limited to, source code, libraries, components,
        texts, documentation) which can be software or elements of the software
        and which are provided by Contributors to the Author for inclusion
        in the Program. \
   1.3. "Contributor" shall mean a person who provides Contributions to
        the Author and agrees with all provisions of this Agreement.
        A Сontributor can be: 1) an individual; or 2) a legal entity or an
        individual entrepreneur in case when an individual provides Contributions
        on behalf of third parties, including on behalf of his employer.
 2. Subject of the Agreement. \
   2.1. Subject of the Agreement shall be the Contributions sent to the Author by Contributors. \
   2.2. The Contributor grants to the Author the right to use Contributions at his own
        discretion and without any necessity to get a prior approval from Contributor or
        any other third party in any way, under a simple (non-exclusive), royalty-free,
        irrevocable license throughout the world by all means not contrary to law, in whole
        or as a part of the Program, or other open-source or closed-source computer programs,
        products or services (hereinafter -- the "License"), including, but not limited to: \
        2.2.1. to execute Contributions and use them for any tasks; \
        2.2.2. to publish and distribute Contributions in modified or unmodified form and/or to rent them; \
        2.2.3. to modify Contributions, add comments, illustrations or any explanations to Contributions while using them; \
        2.2.4. to create other results of intellectual activity based on Contributions, including derivative works and composite works; \
        2.2.5. to translate Contributions into other languages, including other programming languages; \
        2.2.6. to carry out rental and public display of Contributions; \
        2.2.7. to use Contributions under the trade name and/or any trademark or any other label, or without it, as the Author thinks fit; \
   2.3. The Contributor grants to the Author the right to sublicense any of the aforementioned
        rights to third parties on any terms at the Author's discretion. \
   2.4. The License is provided for the entire duration of Contributor's
        exclusive intellectual property rights to the Contributions. \
   2.5. The Contributor grants to the Author the right to decide how and where to mention,
        or to not mention at all, the fact of his authorship, name, nickname and/or company
        details when including Contributions into the Program or in any other computer
        programs, products or services.
 3. Acceptance of the Offer \
   3.1. The Contributor may provide Contributions to the Author in the form of
        a "Pull Request" in an Official Repository of the Program or by any
        other electronic means of communication, including, but not limited to,
        E-mail or messenger applications. \
   3.2. The acceptance of the Offer shall be the fact of provision of Contributions
        to the Author by the Contributor by any means with the following remark:
        “I accept Vitastor CLA agreement: https://git.yourcmc.ru/vitalif/vitastor/src/branch/master/CLA-en.md”
        or “Я принимаю соглашение Vitastor CLA: https://git.yourcmc.ru/vitalif/vitastor/src/branch/master/CLA-ru.md”. \
   3.3. Date of acceptance of the Offer shall be the date of such provision.
 4. Rights and obligations of the parties. \
   4.1. The Contributor reserves the right to use Contributions by any lawful means
        not contrary to this Agreement. \
   4.2. The Author has the right to refuse to include Contributions into the Program
        at any moment with no explanation to the Contributor.
 5. Representations and Warranties. \
   5.1. The person providing Contributions for the purpose of their inclusion
        in the Program represents and warrants that he is the Contributor
        or legally acts on the Contributor's behalf. Name or company details
        of the Contributor shall be provided with the Contribution at the moment
        of their provision to the Author. \
   5.2. The Contributor represents and warrants that he legally owns exclusive
        intellectual property rights to the Contributions. \
   5.3. The Contributor represents and warrants that any further use of
        Contributions by the Author as provided by Contributor under the terms
        of the Agreement does not infringe on intellectual and other rights and
        legitimate interests of third parties. \
   5.4. The Contributor represents and warrants that he has all rights and legal
        capacity needed to accept this Offer; \
   5.5. The Contributor represents and warrants that Contributions don't
        contain malware or any information considered illegal under the law
        of Russian Federation.
 6. Termination of the Agreement \
   6.1. The Agreement may be terminated at will of both Author and Contributor,
        formalised in the written form or if the Agreement is terminated on
        reasons prescribed by the law of Russian Federation.
 7. Final Clauses \
   7.1. The Contributor may optionally sign the Agreement in the written form. \
   7.2. The Agreement is deemed to become effective from the Date of signing of
        the Agreement and until the expiration of Contributor's exclusive
        intellectual property rights to the Contributions. \
   7.3. The Author may unilaterally alter the Agreement without informing Contributors.
        The new version of the document shall come into effect 3 (three) days after
        being published in the Official Repository of the Program at Internet address
        [https://git.yourcmc.ru/vitalif/vitastor/src/branch/master/CLA-en.md](https://git.yourcmc.ru/vitalif/vitastor/src/branch/master/CLA-en.md).
        Contributors should keep informed about the actual version of the Agreement themselves. \
   7.4. If the Author and the Contributor fail to agree on disputable issues,
        disputes shall be referred to the Moscow Arbitration court.
--- a/CLA-ru.md
+++ b/CLA-ru.md
@ -0,0 +1,108 @@
 ## Лицензионное соглашение с участником
 > Данная Оферта написана в Русской и Английской версиях. **Версия на английском
 языке предоставляется в информационных целях** и не связывает стороны договора.
 >
 > В случае несоответствий между положениями Русской и Английской версий Договора,
 **Русская версия имеет приоритет**.
 >
 > Английская версия опубликована по адресу https://git.yourcmc.ru/vitalif/vitastor/src/branch/master/CLA-en.md
 Настоящий договор-оферта (далее по тексту – Оферта, Договор) адресована физическим
 и юридическим лицам (далее – Участникам) и является официальным публичным предложением
 Филиппова Виталия Владимировича (далее – Автора) программного обеспечения Vitastor,
 свидетельство Федеральной службы по интеллектуальной собственности (Роспатент) № 2021617829
 от 20 мая 2021 г. (далее – Программа) о нижеследующем:
 1. Термины и определения \
   1.1. Репозиторий – электронное хранилище, содержащее исходный код Программы. \
   1.2. Доработка – результат интеллектуальной деятельности Участника, включающий
        в себя изменения или дополнения к исходному коду Программы, которые Участник
        желает включить в состав Программы для дальнейшего использования и распространения
        Автором и для этого направляет их Автору. \
   1.3. Участник – физическое или юридическое лицо, вносящее Доработки в код Программы. \
   1.4. ГК РФ – Гражданский кодекс Российской Федерации.
 2. Предмет оферты \
   2.1. Предметом настоящей оферты являются Доработки, отправляемые Участником Автору. \
   2.2. Участник предоставляет Автору право использовать Доработки по собственному усмотрению
        и без необходимости предварительного согласования с Участником или иным третьим лицом
        на условиях простой (неисключительной) безвозмездной безотзывной лицензии, полностью
        или фрагментарно, в составе Программы или других программ, продуктов или сервисов
        как с открытым, так и с закрытым исходным кодом, любыми способами, не противоречащими
        закону, включая, но не ограничиваясь следующими: \
        2.2.1. Запускать и использовать Доработки для выполнения любых задач; \
        2.2.2. Распространять, импортировать и доводить Доработки до всеобщего сведения; \
        2.2.3. Вносить в Доработки изменения, сокращения и дополнения, снабжать Доработки
               при их использовании комментариями, иллюстрациями или пояснениями; \
        2.2.4. Создавать на основе Доработок иные результаты интеллектуальной деятельности,
               в том числе производные и составные произведения; \
        2.2.5. Переводить Доработки на другие языки, в том числе на другие языки программирования; \
        2.2.6. Осуществлять прокат и публичный показ Доработок; \
        2.2.7. Использовать Доработки под любым фирменным наименованием, товарным знаком
               (знаком обслуживания) или иным обозначением, или без такового. \
   2.3. Участник предоставляет Автору право сублицензировать полученные права на Доработки
        третьим лицам на любых условиях на усмотрение Автора. \
   2.4. Участник предоставляет Автору права на Доработки на территории всего мира. \
   2.5. Участник предоставляет Автору права на весь срок действия исключительного права
        Участника на Доработки. \
   2.6. Участник предоставляет Автору права на Доработки на безвозмездной основе. \
   2.7. Участник разрешает Автору самостоятельно определять порядок, способ и
        место указания его имени, реквизитов и/или псевдонима при включении
        Доработок в состав Программы или других программ, продуктов или сервисов.
 3. Акцепт Оферты \
   3.1. Участник может передавать Доработки в адрес Автора через зеркала официального
        Репозитория Программы по адресам https://git.yourcmc.ru/vitalif/vitastor/ или
        https://github.com/vitalif/vitastor/ в виде “запроса на слияние” (pull request),
        либо в письменном виде или с помощью любых других электронных средств коммуникации,
        например, электронной почты или мессенджеров. \
   3.2. Факт передачи Участником Доработок в адрес Автора любым способом с одной из пометок
        “I accept Vitastor CLA agreement: https://git.yourcmc.ru/vitalif/vitastor/src/branch/master/CLA-en.md”
        или “Я принимаю соглашение Vitastor CLA: https://git.yourcmc.ru/vitalif/vitastor/src/branch/master/CLA-ru.md”
        является полным и безоговорочным акцептом (принятием) Участником условий настоящей
        Оферты, т.е. Участник считается ознакомившимся с настоящим публичным договором и
        в соответствии с ГК РФ признается лицом, вступившим с Автором в договорные отношения
        на основании настоящей Оферты. \
   3.3. Датой акцептирования настоящей Оферты считается дата такой передачи.
 4. Права и обязанности Сторон \
   4.1. Участник сохраняет за собой право использовать Доработки любым законным
        способом, не противоречащим настоящему Договору. \
   4.2. Автор вправе отказать Участнику во включении Доработок в состав
        Программы без объяснения причин в любой момент по своему усмотрению.
 5. Гарантии и заверения \
   5.1. Лицо, направляющее Доработки для целей их включения в состав Программы,
        гарантирует, что является Участником или представителем Участника. Имя или реквизиты
        Участника должны быть указаны при их передаче в адрес Автора Программы. \
   5.2. Участник гарантирует, что является законным обладателем исключительных прав
        на Доработки. \
   5.3. Участник гарантирует, что на момент акцептирования настоящей Оферты ему
        ничего не известно (и не могло быть известно) о правах третьих лиц на
        передаваемые Автору Доработки или их часть, которые могут быть нарушены
        в связи с передачей Доработок по настоящему Договору. \
   5.4. Участник гарантирует, что является дееспособным лицом и обладает всеми
        необходимыми правами для заключения Договора. \
   5.5. Участник гарантирует, что Доработки не содержат вредоносного ПО, а также
        любой другой информации, запрещённой к распространению по законам Российской
        Федерации.
 6. Прекращение действия оферты \
   6.1. Действие настоящего договора может быть прекращено по соглашению сторон,
        оформленному в письменном виде, а также вследствие его расторжения по основаниям,
        предусмотренным законом.
 7. Заключительные положения \
   7.1. Участник вправе по желанию подписать настоящий Договор в письменном виде. \
   7.2. Настоящий договор действует с момента его заключения и до истечения срока
        действия исключительных прав Участника на Доработки. \
   7.3. Автор имеет право в одностороннем порядке вносить изменения и дополнения в договор
        без специального уведомления об этом Участников. Новая редакция документа вступает
        в силу через 3 (Три) календарных дня со дня опубликования в официальном Репозитории
        Программы по адресу в сети Интернет
        [https://git.yourcmc.ru/vitalif/vitastor/src/branch/master/CLA-ru.md](https://git.yourcmc.ru/vitalif/vitastor/src/branch/master/CLA-ru.md).
        Участники самостоятельно отслеживают действующие условия Оферты. \
   7.4. Все споры, возникающие между сторонами в процессе их взаимодействия по настоящему
        договору, решаются путём переговоров. В случае невозможности урегулирования споров
        переговорным порядком стороны разрешают их в Арбитражном суде г.Москвы.
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@ -0,0 +1,7 @@
 cmake_minimum_required(VERSION 2.8.12)
 project(vitastor)
 set(VERSION "1.6.1")
 add_subdirectory(src)
--- a/GPL-2.0.txt
+++ b/GPL-2.0.txt
@ -0,0 +1,339 @@
                    GNU GENERAL PUBLIC LICENSE
                       Version 2, June 1991
 Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.
                            Preamble
  The licenses for most software are designed to take away your
 freedom to share and change it.  By contrast, the GNU General Public
 License is intended to guarantee your freedom to share and change free
 software--to make sure the software is free for all its users.  This
 General Public License applies to most of the Free Software
 Foundation's software and to any other program whose authors commit to
 using it.  (Some other Free Software Foundation software is covered by
 the GNU Lesser General Public License instead.)  You can apply it to
 your programs, too.
  When we speak of free software, we are referring to freedom, not
 price.  Our General Public Licenses are designed to make sure that you
 have the freedom to distribute copies of free software (and charge for
 this service if you wish), that you receive source code or can get it
 if you want it, that you can change the software or use pieces of it
 in new free programs; and that you know you can do these things.
  To protect your rights, we need to make restrictions that forbid
 anyone to deny you these rights or to ask you to surrender the rights.
 These restrictions translate to certain responsibilities for you if you
 distribute copies of the software, or if you modify it.
  For example, if you distribute copies of such a program, whether
 gratis or for a fee, you must give the recipients all the rights that
 you have.  You must make sure that they, too, receive or can get the
 source code.  And you must show them these terms so they know their
 rights.
  We protect your rights with two steps: (1) copyright the software, and
 (2) offer you this license which gives you legal permission to copy,
 distribute and/or modify the software.
  Also, for each author's protection and ours, we want to make certain
 that everyone understands that there is no warranty for this free
 software.  If the software is modified by someone else and passed on, we
 want its recipients to know that what they have is not the original, so
 that any problems introduced by others will not reflect on the original
 authors' reputations.
  Finally, any free program is threatened constantly by software
 patents.  We wish to avoid the danger that redistributors of a free
 program will individually obtain patent licenses, in effect making the
 program proprietary.  To prevent this, we have made it clear that any
 patent must be licensed for everyone's free use or not licensed at all.
  The precise terms and conditions for copying, distribution and
 modification follow.
                    GNU GENERAL PUBLIC LICENSE
   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
  0. This License applies to any program or other work which contains
 a notice placed by the copyright holder saying it may be distributed
 under the terms of this General Public License.  The "Program", below,
 refers to any such program or work, and a "work based on the Program"
 means either the Program or any derivative work under copyright law:
 that is to say, a work containing the Program or a portion of it,
 either verbatim or with modifications and/or translated into another
 language.  (Hereinafter, translation is included without limitation in
 the term "modification".)  Each licensee is addressed as "you".
 Activities other than copying, distribution and modification are not
 covered by this License; they are outside its scope.  The act of
 running the Program is not restricted, and the output from the Program
 is covered only if its contents constitute a work based on the
 Program (independent of having been made by running the Program).
 Whether that is true depends on what the Program does.
  1. You may copy and distribute verbatim copies of the Program's
 source code as you receive it, in any medium, provided that you
 conspicuously and appropriately publish on each copy an appropriate
 copyright notice and disclaimer of warranty; keep intact all the
 notices that refer to this License and to the absence of any warranty;
 and give any other recipients of the Program a copy of this License
 along with the Program.
 You may charge a fee for the physical act of transferring a copy, and
 you may at your option offer warranty protection in exchange for a fee.
  2. You may modify your copy or copies of the Program or any portion
 of it, thus forming a work based on the Program, and copy and
 distribute such modifications or work under the terms of Section 1
 above, provided that you also meet all of these conditions:
    a) You must cause the modified files to carry prominent notices
    stating that you changed the files and the date of any change.
    b) You must cause any work that you distribute or publish, that in
    whole or in part contains or is derived from the Program or any
    part thereof, to be licensed as a whole at no charge to all third
    parties under the terms of this License.
    c) If the modified program normally reads commands interactively
    when run, you must cause it, when started running for such
    interactive use in the most ordinary way, to print or display an
    announcement including an appropriate copyright notice and a
    notice that there is no warranty (or else, saying that you provide
    a warranty) and that users may redistribute the program under
    these conditions, and telling the user how to view a copy of this
    License.  (Exception: if the Program itself is interactive but
    does not normally print such an announcement, your work based on
    the Program is not required to print an announcement.)
 These requirements apply to the modified work as a whole.  If
 identifiable sections of that work are not derived from the Program,
 and can be reasonably considered independent and separate works in
 themselves, then this License, and its terms, do not apply to those
 sections when you distribute them as separate works.  But when you
 distribute the same sections as part of a whole which is a work based
 on the Program, the distribution of the whole must be on the terms of
 this License, whose permissions for other licensees extend to the
 entire whole, and thus to each and every part regardless of who wrote it.
 Thus, it is not the intent of this section to claim rights or contest
 your rights to work written entirely by you; rather, the intent is to
 exercise the right to control the distribution of derivative or
 collective works based on the Program.
 In addition, mere aggregation of another work not based on the Program
 with the Program (or with a work based on the Program) on a volume of
 a storage or distribution medium does not bring the other work under
 the scope of this License.
  3. You may copy and distribute the Program (or a work based on it,
 under Section 2) in object code or executable form under the terms of
 Sections 1 and 2 above provided that you also do one of the following:
    a) Accompany it with the complete corresponding machine-readable
    source code, which must be distributed under the terms of Sections
    1 and 2 above on a medium customarily used for software interchange; or,
    b) Accompany it with a written offer, valid for at least three
    years, to give any third party, for a charge no more than your
    cost of physically performing source distribution, a complete
    machine-readable copy of the corresponding source code, to be
    distributed under the terms of Sections 1 and 2 above on a medium
    customarily used for software interchange; or,
    c) Accompany it with the information you received as to the offer
    to distribute corresponding source code.  (This alternative is
    allowed only for noncommercial distribution and only if you
    received the program in object code or executable form with such
    an offer, in accord with Subsection b above.)
 The source code for a work means the preferred form of the work for
 making modifications to it.  For an executable work, complete source
 code means all the source code for all modules it contains, plus any
 associated interface definition files, plus the scripts used to
 control compilation and installation of the executable.  However, as a
 special exception, the source code distributed need not include
 anything that is normally distributed (in either source or binary
 form) with the major components (compiler, kernel, and so on) of the
 operating system on which the executable runs, unless that component
 itself accompanies the executable.
 If distribution of executable or object code is made by offering
 access to copy from a designated place, then offering equivalent
 access to copy the source code from the same place counts as
 distribution of the source code, even though third parties are not
 compelled to copy the source along with the object code.
  4. You may not copy, modify, sublicense, or distribute the Program
 except as expressly provided under this License.  Any attempt
 otherwise to copy, modify, sublicense or distribute the Program is
 void, and will automatically terminate your rights under this License.
 However, parties who have received copies, or rights, from you under
 this License will not have their licenses terminated so long as such
 parties remain in full compliance.
  5. You are not required to accept this License, since you have not
 signed it.  However, nothing else grants you permission to modify or
 distribute the Program or its derivative works.  These actions are
 prohibited by law if you do not accept this License.  Therefore, by
 modifying or distributing the Program (or any work based on the
 Program), you indicate your acceptance of this License to do so, and
 all its terms and conditions for copying, distributing or modifying
 the Program or works based on it.
  6. Each time you redistribute the Program (or any work based on the
 Program), the recipient automatically receives a license from the
 original licensor to copy, distribute or modify the Program subject to
 these terms and conditions.  You may not impose any further
 restrictions on the recipients' exercise of the rights granted herein.
 You are not responsible for enforcing compliance by third parties to
 this License.
  7. If, as a consequence of a court judgment or allegation of patent
 infringement or for any other reason (not limited to patent issues),
 conditions are imposed on you (whether by court order, agreement or
 otherwise) that contradict the conditions of this License, they do not
 excuse you from the conditions of this License.  If you cannot
 distribute so as to satisfy simultaneously your obligations under this
 License and any other pertinent obligations, then as a consequence you
 may not distribute the Program at all.  For example, if a patent
 license would not permit royalty-free redistribution of the Program by
 all those who receive copies directly or indirectly through you, then
 the only way you could satisfy both it and this License would be to
 refrain entirely from distribution of the Program.
 If any portion of this section is held invalid or unenforceable under
 any particular circumstance, the balance of the section is intended to
 apply and the section as a whole is intended to apply in other
 circumstances.
 It is not the purpose of this section to induce you to infringe any
 patents or other property right claims or to contest validity of any
 such claims; this section has the sole purpose of protecting the
 integrity of the free software distribution system, which is
 implemented by public license practices.  Many people have made
 generous contributions to the wide range of software distributed
 through that system in reliance on consistent application of that
 system; it is up to the author/donor to decide if he or she is willing
 to distribute software through any other system and a licensee cannot
 impose that choice.
 This section is intended to make thoroughly clear what is believed to
 be a consequence of the rest of this License.
  8. If the distribution and/or use of the Program is restricted in
 certain countries either by patents or by copyrighted interfaces, the
 original copyright holder who places the Program under this License
 may add an explicit geographical distribution limitation excluding
 those countries, so that distribution is permitted only in or among
 countries not thus excluded.  In such case, this License incorporates
 the limitation as if written in the body of this License.
  9. The Free Software Foundation may publish revised and/or new versions
 of the General Public License from time to time.  Such new versions will
 be similar in spirit to the present version, but may differ in detail to
 address new problems or concerns.
 Each version is given a distinguishing version number.  If the Program
 specifies a version number of this License which applies to it and "any
 later version", you have the option of following the terms and conditions
 either of that version or of any later version published by the Free
 Software Foundation.  If the Program does not specify a version number of
 this License, you may choose any version ever published by the Free Software
 Foundation.
  10. If you wish to incorporate parts of the Program into other free
 programs whose distribution conditions are different, write to the author
 to ask for permission.  For software which is copyrighted by the Free
 Software Foundation, write to the Free Software Foundation; we sometimes
 make exceptions for this.  Our decision will be guided by the two goals
 of preserving the free status of all derivatives of our free software and
 of promoting the sharing and reuse of software generally.
                            NO WARRANTY
  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
 OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
 PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
 OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
 TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
 PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
 REPAIR OR CORRECTION.
  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
 REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
 INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
 OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
 TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
 YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
 POSSIBILITY OF SUCH DAMAGES.
                     END OF TERMS AND CONDITIONS
            How to Apply These Terms to Your New Programs
  If you develop a new program, and you want it to be of the greatest
 possible use to the public, the best way to achieve this is to make it
 free software which everyone can redistribute and change under these terms.
  To do so, attach the following notices to the program.  It is safest
 to attach them to the start of each source file to most effectively
 convey the exclusion of warranty; and each file should have at least
 the "copyright" line and a pointer to where the full notice is found.
    <one line to give the program's name and a brief idea of what it does.>
    Copyright (C) <year>  <name of author>
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 Also add information on how to contact you by electronic and paper mail.
 If the program is interactive, make it output a short notice like this
 when it starts in an interactive mode:
    Gnomovision version 69, Copyright (C) year name of author
    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
    This is free software, and you are welcome to redistribute it
    under certain conditions; type `show c' for details.
 The hypothetical commands `show w' and `show c' should show the appropriate
 parts of the General Public License.  Of course, the commands you use may
 be called something other than `show w' and `show c'; they could even be
 mouse-clicks or menu items--whatever suits your program.
 You should also get your employer (if you work as a programmer) or your
 school, if any, to sign a "copyright disclaimer" for the program, if
 necessary.  Here is a sample; alter the names:
  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
  `Gnomovision' (which makes passes at compilers) written by James Hacker.
  <signature of Ty Coon>, 1 April 1989
  Ty Coon, President of Vice
 This General Public License does not permit incorporating your program into
 proprietary programs.  If your program is a subroutine library, you may
 consider it more useful to permit linking proprietary applications with the
 library.  If this is what you want to do, use the GNU Lesser General
 Public License instead of this License.
--- a/27
+++ b/27
@ -0,0 +1,27 @@
 Copyright (c) Vitaliy Filippov (vitalif [at] yourcmc.ru), 2019+
 All server-side code (OSD, Monitor and so on) is licensed under the terms of
 Vitastor Network Public License 1.1 (VNPL 1.1), a copyleft license based on
 GNU GPLv3.0 with the additional "Network Interaction" clause which requires
 opensourcing all programs directly or indirectly interacting with Vitastor
 through a computer network and expressly designed to be used in conjunction
 with it ("Proxy Programs"). Proxy Programs may be made public not only under
 the terms of the same license, but also under the terms of any GPL-Compatible
 Free Software License, as listed by the Free Software Foundation.
 This is a stricter copyleft license than the Affero GPL.
 Please note that VNPL doesn't require you to open the code of proprietary
 software running inside a VM if it's not specially designed to be used with
 Vitastor.
 Basically, you can't use the software in a proprietary environment to provide
 its functionality to users without opensourcing all intermediary components
 standing between the user and Vitastor or purchasing a commercial license
 from the author 😀.
 Client libraries (cluster_client and so on) are dual-licensed under the same
 VNPL 1.1 and also GNU GPL 2.0 or later to allow for compatibility with GPLed
 software like QEMU and fio.
 You can find the full text of VNPL-1.1 in the file [VNPL-1.1.txt](VNPL-1.1.txt).
 GPL 2.0 is also included in this repository as [GPL-2.0.txt](GPL-2.0.txt).
--- a/Make-gen.pl
+++ b/Make-gen.pl
@ -1,46 +0,0 @@
 #!/usr/bin/perl
 use strict;
 my $deps = {};
 for my $line (split /\n/, `grep '^#include "' *.cpp *.h`)
 {
    if ($line =~ /^([^:]+):\#include "([^"]+)"/s)
    {
        $deps->{$1}->{$2} = 1;
    }
 }
 my $added;
 do
 {
    $added = 0;
    for my $file (keys %$deps)
    {
        for my $dep (keys %{$deps->{$file}})
        {
            if ($deps->{$dep})
            {
                for my $subdep (keys %{$deps->{$dep}})
                {
                    if (!$deps->{$file}->{$subdep})
                    {
                        $added = 1;
                        $deps->{$file}->{$subdep} = 1;
                    }
                }
            }
        }
    }
 } while ($added);
 for my $file (sort keys %$deps)
 {
    if ($file =~ /\.cpp$/)
    {
        my $obj = $file;
        $obj =~ s/\.cpp$/.o/s;
        print "$obj: $file ".join(" ", sort keys %{$deps->{$file}})."\n";
        print "\tg++ \$(CXXFLAGS) -c -o \$\@ \$\<\n";
    }
 }
--- a/153
+++ b/153
@ -1,153 +0,0 @@
 BLOCKSTORE_OBJS := allocator.o blockstore.o blockstore_impl.o blockstore_init.o blockstore_open.o blockstore_journal.o blockstore_read.o \
 	blockstore_write.o blockstore_sync.o blockstore_stable.o blockstore_rollback.o blockstore_flush.o crc32c.o ringloop.o
 # -fsanitize=address
 CXXFLAGS := -g -O3 -Wall -Wno-sign-compare -Wno-comment -Wno-parentheses -Wno-pointer-arith -fPIC -fdiagnostics-color=always
 all: libfio_blockstore.so osd libfio_sec_osd.so libfio_cluster.so stub_osd stub_uring_osd stub_bench osd_test dump_journal
 clean:
 	rm -f *.o
 dump_journal: dump_journal.cpp crc32c.o blockstore_journal.h
 	g++ $(CXXFLAGS) -o $@ $< crc32c.o
 libblockstore.so: $(BLOCKSTORE_OBJS)
 	g++ $(CXXFLAGS) -o $@ -shared $(BLOCKSTORE_OBJS) -ltcmalloc_minimal -luring
 libfio_blockstore.so: ./libblockstore.so fio_engine.o json11.o
 	g++ $(CXXFLAGS) -shared -o $@ fio_engine.o json11.o ./libblockstore.so -ltcmalloc_minimal -luring
 OSD_OBJS := osd.o osd_secondary.o msgr_receive.o msgr_send.o osd_peering.o osd_flush.o osd_peering_pg.o \
 	osd_primary.o osd_primary_subops.o etcd_state_client.o messenger.o osd_cluster.o http_client.o pg_states.o \
 	osd_rmw.o json11.o base64.o timerfd_manager.o
 osd: ./libblockstore.so osd_main.cpp osd.h osd_ops.h $(OSD_OBJS)
 	g++ $(CXXFLAGS) -o $@ osd_main.cpp $(OSD_OBJS) ./libblockstore.so -ltcmalloc_minimal -luring -lpthread
 stub_osd: stub_osd.o rw_blocking.o
 	g++ $(CXXFLAGS) -o $@ stub_osd.o rw_blocking.o -ltcmalloc_minimal
 STUB_URING_OSD_OBJS := stub_uring_osd.o epoll_manager.o messenger.o msgr_send.o msgr_receive.o ringloop.o timerfd_manager.o json11.o
 stub_uring_osd: $(STUB_URING_OSD_OBJS)
 	g++ $(CXXFLAGS) -o $@ -ltcmalloc_minimal $(STUB_URING_OSD_OBJS) -luring
 stub_bench: stub_bench.cpp osd_ops.h rw_blocking.o
 	g++ $(CXXFLAGS) -o $@ stub_bench.cpp rw_blocking.o -ltcmalloc_minimal
 osd_test: osd_test.cpp osd_ops.h rw_blocking.o
 	g++ $(CXXFLAGS) -o $@ osd_test.cpp rw_blocking.o -ltcmalloc_minimal
 osd_peering_pg_test: osd_peering_pg_test.cpp osd_peering_pg.o
 	g++ $(CXXFLAGS) -o $@ $< osd_peering_pg.o -ltcmalloc_minimal
 libfio_sec_osd.so: fio_sec_osd.o rw_blocking.o
 	g++ $(CXXFLAGS) -ltcmalloc_minimal -shared -o $@ fio_sec_osd.o rw_blocking.o
 FIO_CLUSTER_OBJS := fio_cluster.o cluster_client.o epoll_manager.o etcd_state_client.o \
 	messenger.o msgr_send.o msgr_receive.o ringloop.o json11.o http_client.o pg_states.o timerfd_manager.o base64.o
 libfio_cluster.so: $(FIO_CLUSTER_OBJS)
 	g++ $(CXXFLAGS) -ltcmalloc_minimal -shared -o $@ $(FIO_CLUSTER_OBJS) -luring
 test_blockstore: ./libblockstore.so test_blockstore.cpp timerfd_interval.o
 	g++ $(CXXFLAGS) -o test_blockstore test_blockstore.cpp timerfd_interval.o ./libblockstore.so -ltcmalloc_minimal -luring
 test: test.cpp osd_peering_pg.o
 	g++ $(CXXFLAGS) -o test test.cpp osd_peering_pg.o -luring -lm
 test_allocator: test_allocator.cpp allocator.o
 	g++ $(CXXFLAGS) -o test_allocator test_allocator.cpp allocator.o
 crc32c.o: crc32c.c crc32c.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 json11.o: json11/json11.cpp
 	g++ $(CXXFLAGS) -c -o json11.o json11/json11.cpp
 # Autogenerated
 allocator.o: allocator.cpp allocator.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 base64.o: base64.cpp base64.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 blockstore.o: blockstore.cpp allocator.h blockstore.h blockstore_flush.h blockstore_impl.h blockstore_init.h blockstore_journal.h cpp-btree/btree_map.h crc32c.h object_id.h ringloop.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 blockstore_flush.o: blockstore_flush.cpp allocator.h blockstore.h blockstore_flush.h blockstore_impl.h blockstore_init.h blockstore_journal.h cpp-btree/btree_map.h crc32c.h object_id.h ringloop.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 blockstore_impl.o: blockstore_impl.cpp allocator.h blockstore.h blockstore_flush.h blockstore_impl.h blockstore_init.h blockstore_journal.h cpp-btree/btree_map.h crc32c.h object_id.h ringloop.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 blockstore_init.o: blockstore_init.cpp allocator.h blockstore.h blockstore_flush.h blockstore_impl.h blockstore_init.h blockstore_journal.h cpp-btree/btree_map.h crc32c.h object_id.h ringloop.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 blockstore_journal.o: blockstore_journal.cpp allocator.h blockstore.h blockstore_flush.h blockstore_impl.h blockstore_init.h blockstore_journal.h cpp-btree/btree_map.h crc32c.h object_id.h ringloop.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 blockstore_open.o: blockstore_open.cpp allocator.h blockstore.h blockstore_flush.h blockstore_impl.h blockstore_init.h blockstore_journal.h cpp-btree/btree_map.h crc32c.h object_id.h ringloop.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 blockstore_read.o: blockstore_read.cpp allocator.h blockstore.h blockstore_flush.h blockstore_impl.h blockstore_init.h blockstore_journal.h cpp-btree/btree_map.h crc32c.h object_id.h ringloop.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 blockstore_rollback.o: blockstore_rollback.cpp allocator.h blockstore.h blockstore_flush.h blockstore_impl.h blockstore_init.h blockstore_journal.h cpp-btree/btree_map.h crc32c.h object_id.h ringloop.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 blockstore_stable.o: blockstore_stable.cpp allocator.h blockstore.h blockstore_flush.h blockstore_impl.h blockstore_init.h blockstore_journal.h cpp-btree/btree_map.h crc32c.h object_id.h ringloop.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 blockstore_sync.o: blockstore_sync.cpp allocator.h blockstore.h blockstore_flush.h blockstore_impl.h blockstore_init.h blockstore_journal.h cpp-btree/btree_map.h crc32c.h object_id.h ringloop.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 blockstore_write.o: blockstore_write.cpp allocator.h blockstore.h blockstore_flush.h blockstore_impl.h blockstore_init.h blockstore_journal.h cpp-btree/btree_map.h crc32c.h object_id.h ringloop.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 cluster_client.o: cluster_client.cpp cluster_client.h etcd_state_client.h http_client.h json11/json11.hpp messenger.h object_id.h osd_id.h osd_ops.h ringloop.h timerfd_manager.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 dump_journal.o: dump_journal.cpp allocator.h blockstore.h blockstore_flush.h blockstore_impl.h blockstore_init.h blockstore_journal.h cpp-btree/btree_map.h crc32c.h object_id.h ringloop.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 epoll_manager.o: epoll_manager.cpp epoll_manager.h ringloop.h timerfd_manager.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 etcd_state_client.o: etcd_state_client.cpp base64.h etcd_state_client.h http_client.h json11/json11.hpp object_id.h osd_id.h osd_ops.h pg_states.h ringloop.h timerfd_manager.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 fio_cluster.o: fio_cluster.cpp cluster_client.h epoll_manager.h etcd_state_client.h fio/fio.h fio/optgroup.h http_client.h json11/json11.hpp messenger.h object_id.h osd_id.h osd_ops.h ringloop.h timerfd_manager.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 fio_engine.o: fio_engine.cpp blockstore.h fio/fio.h fio/optgroup.h json11/json11.hpp object_id.h ringloop.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 fio_sec_osd.o: fio_sec_osd.cpp fio/fio.h fio/optgroup.h object_id.h osd_id.h osd_ops.h rw_blocking.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 http_client.o: http_client.cpp http_client.h json11/json11.hpp ringloop.h timerfd_manager.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 messenger.o: messenger.cpp json11/json11.hpp messenger.h object_id.h osd_id.h osd_ops.h ringloop.h timerfd_manager.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 msgr_receive.o: msgr_receive.cpp json11/json11.hpp messenger.h object_id.h osd_id.h osd_ops.h ringloop.h timerfd_manager.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 msgr_send.o: msgr_send.cpp json11/json11.hpp messenger.h object_id.h osd_id.h osd_ops.h ringloop.h timerfd_manager.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 osd.o: osd.cpp blockstore.h cpp-btree/btree_map.h etcd_state_client.h http_client.h json11/json11.hpp messenger.h object_id.h osd.h osd_id.h osd_ops.h osd_peering_pg.h pg_states.h ringloop.h timerfd_manager.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 osd_cluster.o: osd_cluster.cpp base64.h blockstore.h cpp-btree/btree_map.h etcd_state_client.h http_client.h json11/json11.hpp messenger.h object_id.h osd.h osd_id.h osd_ops.h osd_peering_pg.h pg_states.h ringloop.h timerfd_manager.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 osd_flush.o: osd_flush.cpp blockstore.h cpp-btree/btree_map.h etcd_state_client.h http_client.h json11/json11.hpp messenger.h object_id.h osd.h osd_id.h osd_ops.h osd_peering_pg.h pg_states.h ringloop.h timerfd_manager.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 osd_main.o: osd_main.cpp blockstore.h cpp-btree/btree_map.h etcd_state_client.h http_client.h json11/json11.hpp messenger.h object_id.h osd.h osd_id.h osd_ops.h osd_peering_pg.h pg_states.h ringloop.h timerfd_manager.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 osd_peering.o: osd_peering.cpp base64.h blockstore.h cpp-btree/btree_map.h etcd_state_client.h http_client.h json11/json11.hpp messenger.h object_id.h osd.h osd_id.h osd_ops.h osd_peering_pg.h pg_states.h ringloop.h timerfd_manager.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 osd_peering_pg.o: osd_peering_pg.cpp cpp-btree/btree_map.h object_id.h osd_id.h osd_ops.h osd_peering_pg.h pg_states.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 osd_peering_pg_test.o: osd_peering_pg_test.cpp cpp-btree/btree_map.h object_id.h osd_id.h osd_ops.h osd_peering_pg.h pg_states.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 osd_primary.o: osd_primary.cpp blockstore.h cpp-btree/btree_map.h etcd_state_client.h http_client.h json11/json11.hpp messenger.h object_id.h osd.h osd_id.h osd_ops.h osd_peering_pg.h osd_primary.h osd_rmw.h pg_states.h ringloop.h timerfd_manager.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 osd_primary_subops.o: osd_primary_subops.cpp blockstore.h cpp-btree/btree_map.h etcd_state_client.h http_client.h json11/json11.hpp messenger.h object_id.h osd.h osd_id.h osd_ops.h osd_peering_pg.h osd_primary.h osd_rmw.h pg_states.h ringloop.h timerfd_manager.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 osd_rmw.o: osd_rmw.cpp object_id.h osd_id.h osd_rmw.h xor.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 osd_rmw_test.o: osd_rmw_test.cpp object_id.h osd_id.h osd_rmw.cpp osd_rmw.h test_pattern.h xor.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 osd_secondary.o: osd_secondary.cpp blockstore.h cpp-btree/btree_map.h etcd_state_client.h http_client.h json11/json11.hpp messenger.h object_id.h osd.h osd_id.h osd_ops.h osd_peering_pg.h pg_states.h ringloop.h timerfd_manager.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 osd_test.o: osd_test.cpp object_id.h osd_id.h osd_ops.h rw_blocking.h test_pattern.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 pg_states.o: pg_states.cpp pg_states.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 ringloop.o: ringloop.cpp ringloop.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 rw_blocking.o: rw_blocking.cpp rw_blocking.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 stub_bench.o: stub_bench.cpp object_id.h osd_id.h osd_ops.h rw_blocking.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 stub_osd.o: stub_osd.cpp object_id.h osd_id.h osd_ops.h rw_blocking.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 stub_uring_osd.o: stub_uring_osd.cpp epoll_manager.h json11/json11.hpp messenger.h object_id.h osd_id.h osd_ops.h ringloop.h timerfd_manager.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 test.o: test.cpp allocator.h blockstore.h blockstore_flush.h blockstore_impl.h blockstore_init.h blockstore_journal.h cpp-btree/btree_map.h crc32c.h object_id.h osd_id.h osd_ops.h osd_peering_pg.h pg_states.h ringloop.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 test_allocator.o: test_allocator.cpp allocator.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 test_blockstore.o: test_blockstore.cpp blockstore.h object_id.h ringloop.h timerfd_interval.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 timerfd_interval.o: timerfd_interval.cpp ringloop.h timerfd_interval.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 timerfd_manager.o: timerfd_manager.cpp ringloop.h timerfd_manager.h
 	g++ $(CXXFLAGS) -c -o $@ $<
--- a/README-ru.md
+++ b/README-ru.md
@ -0,0 +1,104 @@
 ## Vitastor
 [Read English version](README.md)
 ## Идея
 Вернём былую скорость кластерному блочному хранилищу!
 Vitastor - распределённая блочная и файловая SDS (программная СХД), прямой аналог Ceph RBD и CephFS,
 а также внутренних СХД популярных облачных провайдеров. Однако, в отличие от них, Vitastor
 быстрый и при этом простой. Только пока маленький :-).
 Vitastor архитектурно похож на Ceph, что означает атомарность и строгую консистентность,
 репликацию через первичный OSD, симметричную кластеризацию без единой точки отказа
 и автоматическое распределение данных по любому числу дисков любого размера с настраиваемыми схемами
 избыточности - репликацией или с произвольными кодами коррекции ошибок.
 Vitastor нацелен в первую очередь на SSD и SSD+HDD кластеры с как минимум 10 Гбит/с сетью, поддерживает
 TCP и RDMA и на хорошем железе может достигать задержки 4 КБ чтения и записи на уровне ~0.1 мс,
 что примерно в 10 раз быстрее, чем Ceph и другие популярные программные СХД.
 Vitastor поддерживает QEMU-драйвер, протоколы NBD и NFS, драйверы OpenStack, Proxmox, Kubernetes.
 Другие драйверы могут также быть легко реализованы.
 Подробности смотрите в документации по ссылкам ниже.
 ## Презентации и записи докладов
 - DevOpsConf'2021: презентация ([на русском](https://vitastor.io/presentation/devopsconf/devopsconf.html),
  [на английском](https://vitastor.io/presentation/devopsconf/devopsconf_en.html)),
  [видео](https://vitastor.io/presentation/devopsconf/talk.webm)
 - Highload'2022: презентация ([на русском](https://vitastor.io/presentation/highload/highload.html)),
  [видео](https://vitastor.io/presentation/highload/talk.webm)
 ## Документация
 - Введение
  - [Быстрый старт](docs/intro/quickstart.ru.md)
  - [Возможности](docs/intro/features.ru.md)
  - [Архитектура](docs/intro/architecture.ru.md)
  - [Автор и лицензия](docs/intro/author.ru.md)
 - Установка
  - [Пакеты](docs/installation/packages.ru.md)
  - [Proxmox](docs/installation/proxmox.ru.md)
  - [OpenStack](docs/installation/openstack.ru.md)
  - [Kubernetes CSI](docs/installation/kubernetes.ru.md)
  - [Сборка из исходных кодов](docs/installation/source.ru.md)
 - Конфигурация
  - [Обзор](docs/config.ru.md)
  - Параметры
    - [Общие](docs/config/common.ru.md)
    - [Сетевые](docs/config/network.ru.md)
    - [Клиентский код](docs/config/client.en.md)
    - [Глобальные дисковые параметры](docs/config/layout-cluster.ru.md)
    - [Дисковые параметры OSD](docs/config/layout-osd.ru.md)
    - [Прочие параметры OSD](docs/config/osd.ru.md)
    - [Параметры мониторов](docs/config/monitor.ru.md)
  - [Настройки пулов](docs/config/pool.ru.md)
  - [Метаданные образов в etcd](docs/config/inode.ru.md)
 - Использование
  - [vitastor-cli](docs/usage/cli.ru.md) (консольный интерфейс)
  - [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)
  - [NFS](docs/usage/nfs.ru.md) кластерная файловая система и псевдо-ФС прокси
  - [Администрирование](docs/usage/admin.ru.md)
 - Производительность
  - [Понимание сути производительности](docs/performance/understanding.ru.md)
  - [Теоретический максимум](docs/performance/theoretical.ru.md)
  - [Пример сравнения с Ceph](docs/performance/comparison1.ru.md)
  - [Более новый тест Vitastor 1.3.1](docs/performance/bench2.ru.md)
 ## Автор и лицензия
 Автор: Виталий Филиппов (vitalif [at] yourcmc.ru), 2019+
 Заходите в Telegram-чат Vitastor: https://t.me/vitastor
 Лицензия: VNPL 1.1 на серверный код и двойная VNPL 1.1 + GPL 2.0+ на клиентский.
 VNPL - "сетевой копилефт", собственная свободная копилефт-лицензия
 Vitastor Network Public License 1.1, основанная на GNU GPL 3.0 с дополнительным
 условием "Сетевого взаимодействия", требующим распространять все программы,
 специально разработанные для использования вместе с Vitastor и взаимодействующие
 с ним по сети, под лицензией VNPL или под любой другой свободной лицензией.
 Идея VNPL - расширение действия копилефта не только на модули, явным образом
 связываемые с кодом Vitastor, но также на модули, оформленные в виде микросервисов
 и взаимодействующие с ним по сети.
 Таким образом, если вы хотите построить на основе Vitastor сервис, содержаший
 компоненты с закрытым кодом, взаимодействующие с Vitastor, вам нужна коммерческая
 лицензия от автора 😀.
 На Windows и любое другое ПО, не разработанное *специально* для использования
 вместе с Vitastor, никакие ограничения не накладываются.
 Клиентские библиотеки распространяются на условиях двойной лицензии VNPL 1.0
 и также на условиях GNU GPL 2.0 или более поздней версии. Так сделано в целях
 совместимости с таким ПО, как QEMU и fio.
 Вы можете найти полный текст VNPL 1.1 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).
--- a/README.md
+++ b/README.md
@ -0,0 +1,104 @@
 # Vitastor
 [Читать на русском](README-ru.md)
 ## The Idea
 Make Clustered Block Storage Fast Again.
 Vitastor is a distributed block and file SDS, direct replacement of Ceph RBD and CephFS,
 and also internal SDS's of public clouds. However, in contrast to them, Vitastor is fast
 and simple at the same time. The only thing is it's slightly young :-).
 Vitastor is architecturally similar to Ceph which means strong consistency,
 primary-replication, symmetric clustering and automatic data distribution over any
 number of drives of any size with configurable redundancy (replication or erasure codes/XOR).
 Vitastor targets primarily SSD and SSD+HDD clusters with at least 10 Gbit/s network,
 supports TCP and RDMA and may achieve 4 KB read and write latency as low as ~0.1 ms
 with proper hardware which is ~10 times faster than other popular SDS's like Ceph
 or internal systems of public clouds.
 Vitastor supports QEMU, NBD, NFS protocols, OpenStack, Proxmox, Kubernetes drivers.
 More drivers may be created easily.
 Read more details below in the documentation.
 ## Talks and presentations
 - DevOpsConf'2021: presentation ([in Russian](https://vitastor.io/presentation/devopsconf/devopsconf.html),
  [in English](https://vitastor.io/presentation/devopsconf/devopsconf_en.html)),
  [video](https://vitastor.io/presentation/devopsconf/talk.webm)
 - Highload'2022: presentation ([in Russian](https://vitastor.io/presentation/highload/highload.html)),
  [video](https://vitastor.io/presentation/highload/talk.webm)
 ## Documentation
 - Introduction
  - [Quick Start](docs/intro/quickstart.en.md)
  - [Features](docs/intro/features.en.md)
  - [Architecture](docs/intro/architecture.en.md)
  - [Author and license](docs/intro/author.en.md)
 - Installation
  - [Packages](docs/installation/packages.en.md)
  - [Proxmox](docs/installation/proxmox.en.md)
  - [OpenStack](docs/installation/openstack.en.md)
  - [Kubernetes CSI](docs/installation/kubernetes.en.md)
  - [Building from Source](docs/installation/source.en.md)
 - Configuration
  - [Overview](docs/config.en.md)
  - Parameter Reference
    - [Common](docs/config/common.en.md)
    - [Network](docs/config/network.en.md)
    - [Client](docs/config/client.en.md)
    - [Global Disk Layout](docs/config/layout-cluster.en.md)
    - [OSD Disk Layout](docs/config/layout-osd.en.md)
    - [OSD Runtime Parameters](docs/config/osd.en.md)
    - [Monitor](docs/config/monitor.en.md)
  - [Pool configuration](docs/config/pool.en.md)
  - [Image metadata in etcd](docs/config/inode.en.md)
 - Usage
  - [vitastor-cli](docs/usage/cli.en.md) (command-line interface)
  - [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)
  - [NFS](docs/usage/nfs.en.md) clustered file system and pseudo-FS proxy
  - [Administration](docs/usage/admin.en.md)
 - Performance
  - [Understanding storage performance](docs/performance/understanding.en.md)
  - [Theoretical performance](docs/performance/theoretical.en.md)
  - [Example comparison with Ceph](docs/performance/comparison1.en.md)
  - [Newer benchmark of Vitastor 1.3.1](docs/performance/bench2.en.md)
 ## Author and License
 Copyright (c) Vitaliy Filippov (vitalif [at] yourcmc.ru), 2019+
 Join Vitastor Telegram Chat: https://t.me/vitastor
 All server-side code (OSD, Monitor and so on) is licensed under the terms of
 Vitastor Network Public License 1.1 (VNPL 1.1), a copyleft license based on
 GNU GPLv3.0 with the additional "Network Interaction" clause which requires
 opensourcing all programs directly or indirectly interacting with Vitastor
 through a computer network and expressly designed to be used in conjunction
 with it ("Proxy Programs"). Proxy Programs may be made public not only under
 the terms of the same license, but also under the terms of any GPL-Compatible
 Free Software License, as listed by the Free Software Foundation.
 This is a stricter copyleft license than the Affero GPL.
 Please note that VNPL doesn't require you to open the code of proprietary
 software running inside a VM if it's not specially designed to be used with
 Vitastor.
 Basically, you can't use the software in a proprietary environment to provide
 its functionality to users without opensourcing all intermediary components
 standing between the user and Vitastor or purchasing a commercial license
 from the author 😀.
 Client libraries (cluster_client and so on) are dual-licensed under the same
 VNPL 1.1 and also GNU GPL 2.0 or later to allow for compatibility with GPLed
 software like QEMU and fio.
 You can find the full text of VNPL-1.1 in the file [VNPL-1.1.txt](VNPL-1.1.txt).
 GPL 2.0 is also included in this repository as [GPL-2.0.txt](GPL-2.0.txt).
--- a/VNPL-1.1-RU.txt
+++ b/VNPL-1.1-RU.txt
@ -0,0 +1,680 @@
                СЕТЕВАЯ ПУБЛИЧНАЯ ЛИЦЕНЗИЯ VITASTOR
                  VITASTOR NETWORK PUBLIC LICENSE
                   Версия 1.1, от 6 февраля 2021
 Автор лицензии: Виталий Филиппов <vitalif@yourcmc.ru>, 2021 год
 Каждый имеет право копировать и распространять точные копии этой
 лицензии, но без внесения изменений.
                            ПРЕАМБУЛА
  Сетевая Публичная Лицензия Vitastor - это свободная "копилефт" лицензия для
 для программного обеспечения (ПО) и других видов произведений, специально
 разработанная, чтобы гарантировать кооперацию с сообществом при разработке
 сетевых приложений.
  Большинство лицензий на программное обеспечение и другие произведения
 спроектированы так, чтобы лишить Вас свободы делиться ими и изменять их.
 Сетевая Публичная Лицензия Vitastor, напротив, разработана с целью
 гарантировать Ваше право распространять и вносить изменения во все версии
 программного обеспечения -- для уверенности, что ПО останется свободным для
 всех пользователей.
  Когда мы говорим о свободном ПО, мы имеем в виду свободу использования, а не
 бесплатность. Свободные лицензии, такие, как Сетевая Публичная Лицензия
 Vitastor, составлены для того, чтобы убедиться, что у Вас есть право
 распространять копии свободного ПО (и взимать плату за них, если Вы хотите),
 что Вы получаете исходные тексты или можете получить их, если захотите, что Вы
 можете изменять программное обеспечение или использовать его части в новых
 свободных программах, и что Вы знаете о своем праве делать всё это.
  Разработчики, использующие Сетевую Публичную Лицензию Vitastor, гарантируют
 Ваши права при помощи следующих мер: (1) закрепляют авторское право на
 программное обеспечение, и (2) предлагают Вам принять условия настоящей
 Лицензии, закрепляющей Ваше право на создание копий, распространение и (или)
 модификацию программного обеспечения.
  Еще одно преимущество защиты свободы всех пользователей заключается в том,
 что улучшения, сделанные в разных версиях программы, при их широком
 распространении становятся доступными для использования другими разработчиками.
 Многие разработчики программного обеспечения воодушевляются этим
 сотрудничеством и пользуются его преимуществами. Однако, если программное
 обеспечение используется на сетевых серверах, данный результат не всегда
 достигается. Генеральная публичная лицензия GNU разрешает создание измененных
 версий и предоставление неограниченного доступа к ним, не делая общедоступным
 их исходный текст. Даже генеральная публичная лицензия GNU Affero разрешает
 использование модифицированной версии свободной программы в закрытой среде, где
 внешние пользователи взаимодействуют с ней только через закрытый промежуточный
 интерфейс (прокси), опять же, без открытия в свободный публичный доступ как
 самой программы, так и прокси.
  Сетевая Публичная Лицензия Vitastor разработана специально, чтобы
 гарантировать, что в таких случаях и модифицированная версия программы, и
 прокси останутся доступными сообществу. Для этого лицензия требует от
 операторов сетевых серверов предоставлять исходный код оригинальной программы,
 а также всех других программ, взаимодействующих с ней на их серверах,
 пользователям этих серверов, на условиях свободных лицензий. Таким образом,
 публичное использование изменённой версии ПО на сервере, прямо или косвенно
 доступном пользователям, даёт пользователям доступ к исходным кодам изменённой
 версии.
  Детальные определения используемых терминов и описание условий копирования,
 распространения и внесения изменений приведены ниже.
                        ТЕРМИНЫ И УСЛОВИЯ
  0. Определения.
  "Настоящая Лицензия" -- версия 1.1 Сетевой Публичной Лицензии Vitastor.
  Под "Авторским правом" понимаются все законы, сходные с авторско-правовыми,
 которые применяются к любым видам работ, например, к топологиям микросхем.
  Термином "Программа" обозначается любое охраноспособное произведение,
 используемое в соответствии с настоящей Лицензией. Лицензиат именуется "Вы".
 "Лицензиаты" и "получатели" могут быть как физическими лицами, так и
 организациями.
  "Внесение изменений" в произведение означает копирование или адаптацию
 произведения целиком или в части, способом, требующим разрешения
 правообладателя, за исключением изготовления его точной копии. Получившееся
 произведение называется "измененной версией" предыдущего произведения или
 произведением, "основанным на" более ранней работе.
  Термином "Лицензионное произведение" обозначается неизмененная Программа или
 произведение, основанное на Программе.
  "Распространение" произведения означает совершение с ним действий, которые
 при отсутствии разрешения сделают Вас прямо или косвенно ответственным за
 нарушение действующего закона об авторском праве, за исключением запуска на
 компьютере или изменения копии, созданной в личных целях. Распространение
 включает в себя копирование, раздачу копий (с изменениями или без них),
 доведение до всеобщего сведения, а в некоторых странах -- и другие действия.
  "Передача" произведения означает любой вид распространения, который позволяет
 другим лицам создавать или получать копии произведения. Обычное взаимодействие
 с пользователем через компьютерную сеть без создания копии передачей не
 является.
  Интерактивный интерфейс пользователя должен отображать "Информация об
 авторском праве", достаточную для того, чтобы (1) обеспечить отображение
 соответствующего уведомления об авторских правах и (2) сообщить пользователю
 о том, что ему не предоставляются никакие гарантии на произведение (за
 исключением явным образом предоставленных гарантий), о том, что лицензиаты
 могут передавать произведение на условиях, описанных в настоящей Лицензии,
 а также о том, как ознакомиться с текстом настоящей Лицензии. Если интерфейс
 предоставляет собой список пользовательских команд или настроек, наподобие
 меню, это требование считается выполненным при наличии явно выделенного
 пункта в таком меню.
  1. Исходный текст.
  Под "Исходным текстом" понимается произведение в форме, которая более всего
 подходит для внесения в него изменений. "Объектным кодом" называется
 произведение в любой иной форме.
  "Стандартный интерфейс" -- интерфейс, который либо является общепринятым
 стандартом, введенным общепризнанным органом по стандартизации, либо, в случае
 интерфейсов, характерных для конкретного языка программирования -- тот,
 который широко используется разработчиками, пишущими программы на этом языке.
  "Системные библиотеки" исполняемого произведения включают в себя то, что не
 относится к произведению в целом и при этом (a) входит в обычный комплект
 Основного компонента, но при этом не является его частью и (b) служит только
 для обеспечения работы с этим Основным компонентом или для реализации
 Стандартного интерфейса, для которого существует общедоступная реализация,
 опубликованная в виде исходного текста. "Основным компонентом" в данном
 контексте назван главный существенный компонент (ядро, оконная система и т.д.)
 определенной операционной системы (если она используется), под управлением
 которой функционирует исполняемое произведение, либо компилятор, используемый
 для создания произведения или интерпретатор объектного кода, используемый для
 его запуска.
  "Полный исходный текст" для произведения в форме объектного кода -- весь
 исходный текст, необходимый для создания, установки и (для исполняемого
 произведения) функционирования объектного кода, а также модификации
 произведения, включая сценарии, контролирующие эти действия. Однако он не
 включает в себя Системные библиотеки, необходимые для функционирования
 произведения, инструменты общего назначения или общедоступные свободные
 программы, которые используются в неизменном виде для выполнения этих
 действий, но не являются частью произведения. Полный исходный текст включает
 в себя, например, файлы описания интерфейса, прилагаемые к файлам исходного
 текста произведения, а также исходные тексты общих библиотек и динамически
 связанных подпрограмм, которые требуются для функционирования произведения
 и разработаны специально для этого, например, для прямой передачи данных
 или управления потоками между этими подпрограммами и другими частями
 произведения. Полный исходный текст не включает в себя то, что пользователи
 могут сгенерировать автоматически из других частей Полного исходного текста.
 Полным исходным текстом для произведения в форме исходных текстов является
 само это произведение.
  2. Основные права.
  Все права, предоставленные на основании настоящей Лицензии, действуют в
 течение срока действия авторских прав на Программу и не могут быть отозваны
 при условии, что сформулированные в ней условия соблюдены. Настоящая Лицензия
 однозначно подтверждает Ваши неограниченные права на запуск неизмененной
 Программы. Настоящая Лицензия распространяется на результаты функционирования
 Лицензионного произведения только в том случае, если они, учитывая их
 содержание, сами являются частью Лицензионного произведения. Настоящая
 Лицензия подтверждает Ваши права на  свободное использование произведения
 или другие аналогичные полномочия, предусмотренные действующим
 законодательством об авторском праве.
  Если Вы не осуществляете обычную передачу Лицензионного произведения, то
 можете как угодно создавать, запускать и распространять его копии до тех пор,
 пока ваша Лицензия сохраняет силу. Вы можете передавать Лицензионные
 произведения третьим лицам исключительно для того, чтобы они внесли в них
 изменения для Вас или предоставили Вам возможность их запуска, при условии,
 что Вы соглашаетесь с условиями настоящей Лицензии при передаче всех
 материалов, авторскими правами на которые Вы не обладаете. Лица, создающие
 или запускающие Лицензионные произведения для Вас, должны делать это
 исключительно от Вашего имени, под Вашим руководством и контролем, на
 условиях, которые запрещают им создание без Вашей санкции каких-либо копий
 материалов, на которые Вы обладаете авторским правом.
  Любая другая передача разрешается исключительно при соблюдении описанных
 ниже условий. Сублицензирование не допускается; раздел 10 делает его не нужным.
  3. Защита прав пользователей от законов, запрещающих обход технических средств.
  Ни одно Лицензионное произведение не должно считаться содержащим эффективные
 технические средства, удовлетворяющие требованиям любого действующего закона,
 принятого для исполнения обязательств, предусмотренных статьей 11 Договора ВОИС
 по авторскому праву от 20 декабря 1996 года или аналогичных законов,
 запрещающих или ограничивающих обход таких технических средств.
  При передаче Лицензионного произведения Вы отказываетесь от всех
 предоставляемых законом полномочий по запрету обхода технических средств,
 используемых авторами в связи с осуществлением их прав, признавая, что такой
 обход находится в рамках осуществления прав на использование Лицензионного
 произведения, предоставленных настоящей Лицензией; также Вы отказываетесь
 от любых попыток ограничить функционирование произведения или внесение в него
 изменений, направленных на реализацию предоставленных Вам законом прав на
 запрет пользователю обхода технических средств.
  4. Передача неизмененных копий.
  Вы можете передавать точные копии исходных текстов Программы в том виде,
 в котором Вы их получили, на любом носителе, при условии, что Вы прилагаете
 к каждой копии соответствующее уведомление об авторских правах способом,
 обеспечивающим ознакомление с ним пользователя; сохраняете все уведомления
 о том, что к тексту применима настоящая Лицензия и любые ограничения,
 добавленные в соответствии с разделом 7; сохраняете все уведомления об
 отсутствии каких-либо гарантий; предоставляете всем получателям вместе с
 Программой копию настоящей Лицензии.
  Вы можете установить любую цену за каждую копию, которую Вы передаете,
 или распространять копии бесплатно; также Вы можете предложить поддержку
 или гарантию за отдельную плату.
  5. Передача измененных исходных текстов.
  Вы можете передавать исходный текст произведения, основанного на Программе,
 или изменений, необходимых для того, чтобы получить его из Программы, на
 условиях, описанных в разделе 4, при соблюдении следующих условий:
    а) Произведение должно содержать уведомления о произведенных Вами
    изменениях с указанием их даты, сделанные способом, обеспечивающим
    ознакомление с ними пользователя.
    b) Произведение должно содержать уведомление о том, что оно
    распространяется на условиях настоящей Лицензии, а также об условиях,
    добавленных в соответствии с разделом 7, сделанное способом,
    обеспечивающим ознакомление с ним пользователя. Данное требование имеет
    приоритет над требованиями раздела 4 "оставлять нетронутыми все
    уведомления".
    c) Вы должны передать на условиях настоящей Лицензии всю работу целиком
    любому лицу, которое приобретает копию. Таким образом, настоящая Лицензия
    вместе с любыми применимыми условиями раздела 7 будет применяться к
    произведению в целом и всем его частям, независимо от их комплектности.
    Настоящая Лицензия не дает права на лицензирование произведения на любых
    других условиях, но это не лишает законной силы такое разрешение, если Вы
    получили его отдельно.
    d) Если произведение имеет интерактивные пользовательские интерфейсы,
    каждый из них должен отображать Информацию об авторском праве; однако,
    если Программа имеет пользовательские интерфейсы, которые не отображают
    информацию об авторском праве, от Вашего произведения этого также не
    требуется.
  Включение Лицензионного произведения в подборку на разделе хранения данных
 или на носителе, на котором распространяется произведение, вместе с другими
 отдельными самостоятельными произведениями, которые по своей природе не
 являются переработкой Лицензионного произведения и не объединены с ним,
 например, в программный комплекс, называется "набором", если авторские права
 на подборку не используются для ограничения доступа к ней или законных прав
 её пользователей сверх того, что предусматривают лицензии на отдельные
 произведения. Включение Лицензионного произведения в набор не влечет применения
 положений настоящей Лицензии к остальным его частям.
  6. Передача произведения в формах, не относящихся к исходному тексту.
  Вы можете передавать Лицензионное произведение в виде объектного кода в
 соответствии с положениями разделов 4 и 5, при условии, что Вы также передаете
 машиночитаемый Полный исходный текст в соответствии с условиями настоящей
 Лицензии, одним из следующих способов:
    а) Передавая объектный код или содержащий его материальный продукт (включая
    распределенный материальный носитель), с приложением Полного исходного
    текста наматериальном носителе, обычно используемом для обмена программным
    обеспечением.
    b) Передавая объектный код или содержащий его материальный продукт (включая
    носитель, на котором распространяется произведение), с письменным
    предложением, действительным в течение не менее трех лет либо до тех пор,
    пока Вы предоставляете запасные части или поддержку для данного продукта,
    о передаче любому обладателю объектного кода (1) копии Полного исходного
    текста для всего программного обеспечения, содержащегося в продукте, на
    которое распространяется действие настоящей Лицензии, на физическом
    носителе, обычно используемом для обмена программным обеспечением, по цене,
    не превышающей разумных затрат на передачу копии, или (2) доступа к Полному
    исходному тексту с возможностью его копирования с сетевого сервера без
    взимания платы.
    с) Передавая отдельные копии объектного кода с письменной копией предложения
    о предоставлении Полного исходного текста. Этот вариант допускается только
    в отдельных случаях при распространении без извлечения прибыли, и только
    если Вы получили объектный код с таким предложением в соответствии
    с пунктом 6b.
    d) Передавая объектный код посредством предоставления доступа к нему по
    определенному адресу (бесплатно или за дополнительную плату), и предлагая
    эквивалентный доступ к Полному исходному тексту таким же способом по тому же
    адресу без какой-либо дополнительной оплаты. От Вас не требуется принуждать
    получателей копировать Полный исходный текст вместе с объектным кодом. Если
    объектный код размещен на сетевом сервере, Полный исходный текст может
    находиться на другом сервере (управляемом Вами или третьим лицом), который
    предоставляет аналогичную возможность копирования; при этом Вы должны четко
    указать рядом с объектным кодом способ получения Полного исходного текста.
    Независимо от того, на каком сервере расположен Полный исходный текст, Вы
    обязаны убедиться в том, что он будет распространяться в течение времени,
    необходимого для соблюдения этих требований.
    e) Передавая объектный код с использованием одноранговой (пиринговой) сети,
    при условии информирования других пользователей сети о том, где можно
    бесплатно получить объектный код и Полный исходный текст произведения
    способом, описанным в пункте 6d.
  Не нужно включать в передаваемый объектный код его отделимые части, исходные
 тексты которых не входят в состав Полного исходного текста, такие как Системные
 библиотеки.
  "Потребительский товар" это либо (1) "товар, предназначенный для личных нужд",
 под которым понимается любое материальное личное имущество, которое обычно
 используется для личных, семейных или домашних целей, или (2) что-либо
 спроектированное или продающееся для использования в жилище. При определении
 того, предназначен ли товар для личных нужд, сомнения должны толковаться в
 пользу положительного ответа на этот вопрос. Применительно к конкретному
 товару, используемому конкретным пользователем, под выражением "обычно
 используется" имеется в виду способ, которым данный вид товаров преимущественно
 или как правило используется, независимо от статуса конкретного пользователя
 или способа, которым конкретный пользователь использует, предполагает или
 будет использовать товар. Товар относится к предназначенным для личных нужд
 независимо от того, насколько часто он используется в коммерческой
 деятельности, промышленности или иной сфере, не относящейся к личным нуждам,
 за исключением случая, когда использование в этой сфере представляет собой
 единственный основной способ использования такого товара.
  "Информация, необходимая для установки" Потребительского товара -- любые
 методы, процедуры, сведения, необходимые для авторизации, или другая
 информация, необходимая для установки и запуска в Потребительском товаре
 измененных версий Лицензионного произведения, полученных при изменении
 Полного исходного текста. Данная информация должна быть достаточной для
 того, чтобы обеспечить возможность внесения в исходный текст изменений,
 не приводящих к ограничению или нарушению его дальнейшей работоспособности.
  Если вместе с Потребительским товаром или специально для использования
 в нём Вы передаете произведение в виде объектного кода на условиях, описанных
 в данном разделе, и такая передача является частью сделки, по которой право
 владения и пользования Потребительским товаром переходит к получателю
 пожизненно или на определенный срок (независимо от признаков сделки), Полный
 исходный текст, передаваемый согласно данному разделу, должен сопровождаться
 Информацией, необходимой для установки. Но это требование не применяется,
 если ни Вы, ни какое-либо третье лицо не сохраняет за собой возможности
 установки измененного объектного кода на Потребительский товар (например,
 произведение было установлено в постоянную память).
  Требование о предоставлении Информации, необходимой для установки, не
 включает в себя требование продолжения оказания услуг по поддержке,
 предоставления гарантии или обновлений для произведения, которое было изменено
 или установлено получателем, либо для Потребительского товара, в котором оно
 было изменено или на который оно было установлено. В доступе к сети может быть
 отказано, если само внесение изменений существенно и негативно влияет на
 работу сети, нарушает правила обмена данными или не поддерживает протоколы для
 обмена данными по сети.
  Передаваемый в соответствии с данным разделом Полный исходный текст и
 предоставленная Информация, необходимая для установки, должны быть записаны в
 формате, который имеет общедоступное описание (и общедоступную реализацию,
 опубликованную в форме исходного текста) и не должны требовать никаких
 специальных паролей или ключей для распаковки, чтения или копирования.
  7. Дополнительные условия.
  "Дополнительными разрешениями" называются условия, которые дополняют условия
 настоящей Лицензии, делая исключения из одного или нескольких её положений.
 Дополнительные разрешения, которые применимы ко всей Программе, должны
 рассматриваться как часть настоящей Лицензии, в той степени, в которой они
 соответствуют действующему законодательству. Если дополнительные разрешения
 применяются только к части Программы, эта часть может быть использована отдельно
 на измененных условиях, но вся Программа продолжает использоваться на условиях
 настоящей Лицензии без учета дополнительных разрешений.
  Когда Вы передаете копию Лицензионного произведения, Вы можете по своему
 усмотрению исключить любые дополнительные разрешения, примененные к этой копии
 или к любой её части. (Для дополнительных разрешений может быть заявлено
 требование об их удалении в определенных случаях, когда Вы вносите изменения в
 произведение.) Вы можете добавлять дополнительные разрешения к добавленным Вами
 в Лицензионное произведение материалам, на которые Вы обладаете авторскими
 правами или правом выдачи соответствующего разрешения.
  Независимо от любых других положений настоящей Лицензии, Вы можете дополнить
 следующими условиями положения настоящей Лицензии в отношении материала,
 добавленного к Лицензионному произведению (если это разрешено обладателями
 авторских прав на материал):
    a) отказом от гарантий или ограничением ответственности, отличающимися от
    тех, что описаны в разделах 15 и 16 настоящей Лицензии; либо
    b) требованием сохранения соответствующей информации о правах или об
    авторстве материала, или включения её в Информацию об авторском праве,
    отображаемую содержащим его произведением; либо
    c) запретом на искажение информации об источнике происхождения материала
    или требованием того, чтобы измененные версии такого материала содержали
    корректную отметку об отличиях от исходной версии; либо
    d) ограничением использования в целях рекламы имен лицензиаров или авторов
    материала; либо
    e) отказом от предоставления прав на использование в качестве товарных
    знаков некоторых торговых наименований, товарных знаков или знаков
    обслуживания; либо
    f) требованием от каждого, кто по договору передает материал (или его
    измененные версии), предоставления компенсации лицензиарам и авторам
    материала в виде принятия на себя любой ответственности, которую этот
    договор налагает на лицензиаров и авторов.
  Все остальные ограничительные дополнительные условия считаются "дополнительными
 запретами" по смыслу раздела 10. Если программа, которую Вы получили, или любая
 её часть содержит уведомление о том, что наряду с настоящей Лицензией её
 использование регулируется условием, относящимся к дополнительным запретам, Вы
 можете удалить такое условие. Если лицензия содержит дополнительный запрет, но
 допускает лицензирование на измененных условиях или передачу в соответствии с
 настоящей Лицензией, Вы можете добавить к Лицензионному произведению материал,
 используемый на условиях такой лицензии, в том случае, если дополнительный
 запрет не сохраняется при таком изменении условий лицензии или передаче.
  Если Вы добавляете условия для использования Лицензионного произведения в
 соответствии с настоящим разделом, Вы должны поместить в соответствующих файлах
 исходного текста уведомление о том, что к этим файлам применяются дополнительные
 условия, или указание на то, как ознакомиться с соответствующими условиями.
  Дополнительные разрешающие или ограничивающие условия могут быть сформулированы
 в виде отдельной лицензии или зафиксированы как исключения; вышеуказанные
 требования применяются в любом случае.
  8. Прекращение действия.
  Вы не можете распространять Лицензионное произведение или вносить в него
 изменения на условиях, отличающихся от явно оговоренных в настоящей Лицензии.
 Любая попытка распространения или внесения изменений на иных условиях является
 ничтожной и автоматически прекращает Ваши права, полученные по настоящей
 Лицензии (включая лицензию на любые патенты, предоставленные согласно третьему
 пункту раздела 11).
  Тем не менее если Вы прекращаете нарушение настоящей Лицензии, Ваши права,
 полученные от конкретного правообладателя, восстанавливаются (а) временно, до
 тех пор пока правообладатель явно и окончательно не прекратит действие Ваших
 прав, и (б) навсегда, если правообладатель не уведомит Вас о нарушении с помощью
 надлежащих средств в течение 60 дней после прекращения нарушений.
  Кроме того, Ваши права, полученные от конкретного правообладателя,
 восстанавливаются навсегда, если правообладатель впервые любым подходящим
 способом уведомляет Вас о нарушении настоящей Лицензии на свое произведение (для
 любого произведения) и Вы устраняете нарушение в течение 30 дней после получения
 уведомления.
  Прекращение Ваших прав, описанное в настоящем разделе, не прекращает действие
 лицензий лиц, которые получили от Вас копии произведения или права,
 предоставляемые настоящей Лицензией. Если Ваши права были прекращены навсегда и
 не восстановлены, Вы не можете вновь получить право на тот же материал на
 условиях, описанных в разделе 10.
  9. Акцепт не требуется для получения копий.
  Вы не обязаны принимать условия настоящей Лицензии для того, чтобы получить или
 запустить копию Программы. Случайное распространение Лицензионного произведения,
 происходящее вследствие использования одноранговой (пиринговой) сети для
 получения его копии, также не требует принятия этих условий. Тем не менее только
 настоящая Лицензия дает Вам право распространять или изменять любое Лицензионное
 произведение. Если Вы не приняли условия настоящей Лицензии, такие действия
 будут нарушением авторского права. Поэтому изменяя или распространяя
 Лицензионное произведение, Вы выражаете согласие с условиями настоящей Лицензии.
  10. Автоматическое получение прав последующими получателями.
  Каждый раз, когда Вы передаете Лицензионное произведение, получатель
 автоматически получает от его лицензиара право запускать, изменять и
 распространять это произведение при условии соблюдения настоящей Лицензии. Вы не
 несете ответственности за соблюдение третьими лицами условий настоящей Лицензии.
  "Реорганизацией" называются действия, в результате которых передается управление
 организацией или значительная часть её активов, а также происходит разделение
 или слияние организаций. Если распространение Лицензионного произведения
 является результатом реорганизации, каждая из сторон сделки, получающая копию
 произведения, также получает все права на произведение, которые предшествующее
 юридическое лицо имело или могло предоставить согласно предыдущему абзацу, а
 также право на владение Полным исходным текстом произведения от предшественника,
 осуществляемое в его интересах, если предшественник владеет им или может
 получить его при разумных усилиях.
  Вы не можете налагать каких-либо дополнительных ограничений на осуществление
 прав, предоставленных или подтвержденных в соответствии с настоящей Лицензией.
 Например, Вы не можете ставить осуществление прав, предоставленных по настоящей
 Лицензии, в зависимость от оплаты отчислений, роялти или других сборов; также Вы
 не можете инициировать судебный процесс (включая встречный иск или заявление
 встречного требования в судебном процессе) о нарушении любых патентных прав при
 создании, использовании, продаже, предложении продажи, импорте Программы или
 любой её части.
  11. Патенты.
  "Инвестором" называется правообладатель, разрешающий использование Программы
 либо произведения, на котором основана Программа, на условиях настоящей
 Лицензии. Произведение, лицензированное таким образом, называется "версией со
 вкладом" инвестора.
  "Неотъемлемые патентные претензии" инвестора -- все патентные права,
 принадлежащие инвестору или контролируемые им в настоящее время либо
 приобретенные в будущем, которые могут быть нарушены созданием, использованием
 или продажей версии со вкладом, допускаемыми настоящей Лицензией; они не
 включают в себя права, которые будут нарушены исключительно вследствие будущих
 изменений версии со вкладом. Для целей данного определения под "контролем"
 понимается право выдавать патентные сублицензии способами, не нарушающими
 требований настоящей Лицензии.
  Каждый инвестор предоставляет Вам неисключительную безвозмездную лицензию на
 патент, действующую во всем мире, соответствующую неотъемлемым патентным
 претензиям инвестора, на создание, использование, продажу, предложение для
 продажи, импорт, а также запуск, внесение изменений и распространение всего, что
 входит в состав версии со вкладом.
  В следующих трех абзацах "лицензией на патент" называется любое явно выраженное
 вовне согласие или обязательство не применять патент (например, выдача
 разрешения на использование запатентованного объекта или обещание не подавать в
 суд за нарушение патента). "Выдать" кому-то такую лицензию на патент означает
 заключить такое соглашение или обязаться не применять патент против него.
  Если Вы передаете Лицензионное произведение, сознательно основываясь на лицензии
 на патент, в то время как Полный исходный текст произведения невозможно
 бесплатно скопировать с общедоступного сервера или другим не вызывающим
 затруднений способом, Вы должны либо (1) обеспечить возможность такого доступа к
 Полному исходному тексту, либо (2) отказаться от прав, предоставленных по
 лицензии на патент для данного произведения, либо (3) принять меры по передаче
 лицензии на патент последующим получателям произведения, в соответствии с
 требованиями настоящей Лицензии. "Сознательно основываясь" означает, что Вы
 знаете, что при отсутствии лицензии на патент передача Вами Лицензионного
 произведения в определенной стране или использование получателем переданного ему
 Вами Лицензионного произведения в этой стране нарушит один или несколько
 определенных патентов этой страны, срок действия которых не истек.
  Если в соответствии или в связи с единичной сделкой либо соглашением Вы
 передаете или делаете заказ на распространение Лицензионного произведения, и
 предоставляете определенным лицам, получающим Лицензионное произведение,
 лицензию на патент, разрешающую им использовать, распространять, вносить
 изменения или передавать конкретные экземпляры Лицензионного произведения,
 права, которые Вы предоставляете по лицензии на патент, автоматически переходят
 ко всем получателям Лицензионного произведения и произведений, созданных на его
 основе.
  Патентная лицензия называется "дискриминирующей", если она не покрывает,
 запрещает осуществление или содержит в качестве условия отказ от применения
 одного или нескольких прав, предоставленных настоящей Лицензией. Вы не можете
 передавать Лицензионное произведение, если Вы являетесь участником договора с
 третьим лицом, осуществляющим распространение программного обеспечения, в
 соответствии с которым Вы делаете в пользу третьего лица выплаты, размер которых
 зависит от масштабов Вашей деятельности по передаче произведения, и в
 соответствии с которым любое третье лицо, получающее от Вас Лицензионное
 произведение, делает это на условиях дискриминирующей патентной лицензии (а)
 которая зависит от количества копий Лицензионного произведения, переданных Вами
 (или копий, сделанных с этих копий), или (b) которая используется
 преимущественно в конкретных товарах или подборках, содержащих Лицензионное
 произведение, или в связи с ними, в том случае, если Вы заключили данный договор
 или получили лицензию на патент после 28 марта 2007 года.
  Ничто в настоящей Лицензии не должно толковаться как исключение или ограничение
 любого предполагаемого права или других способов противодействия нарушениям,
 которые во всем остальном могут быть доступны для Вас в соответствии с
 применимым патентным правом.
  12. Запрет отказывать в свободе другим.
  Если на Вас наложены обязанности (будь то по решению суда, договору или иным
 способом), которые противоречат условиям настоящей Лицензии, это не освобождает
 Вас от соблюдения её условий. Если Вы не можете передать Лицензионное
 произведение так, чтобы одновременно выполнять Ваши обязательства по настоящей
 Лицензии и любые другие относящиеся к делу обязательства, то Вы не можете
 передавать его вообще. Например, если Вы согласны с условием, обязывающими Вас
 производить сбор отчислений за дальнейшую передачу от тех, кому Вы передаете
 Программу, то для того, чтобы соблюсти это условие и выполнить требования
 настоящей Лицензии, Вы должны полностью воздержаться от передачи Программы.
  13. Удаленное сетевое взаимодействие.
  Под "Прокси-программой" понимается отдельная программа, специально
 разработанная для использования совместно с Лицензионным произведением,
 и взаимодействующая с ним прямо или косвенно через любой вид программного
 интерфейса, компьютерную сеть, имитацию такой сети, или, в свою очередь,
 через другую Прокси-программу.
  Независимо от любых других положений настоящей Лицензии, если вы
 предоставляете любому пользователю возможность взаимодействовать с Лицензионным
 произведением через компьютерную сеть, имитацию такой сети, или через любое
 количество "Прокси-программ", вы должны в явной форме предложить этому
 пользователю возможность получить Полный исходный текст Лицензионного
 произведения и всех Прокси-программ путём предоставления доступа к нему
 с сетевого сервера без взимания платы, посредством стандартных или
 традиционных способов, используемых для копирования программного обеспечения.
 Полный исходный текст Лицензионного произведения должен предоставляться
 пользователю на условиях настоящей Лицензии, а Полный исходный текст
 Прокси-программ должен предоставляться пользователю либо на условиях настоящей
 Лицензии, либо на условиях одной из свободных лицензий, совместимых с
 Генеральной публичной Лицензией GNU, перечисленных Фондом Свободного
 Программного Обеспечения в списке под названием "Лицензии свободных программ,
 совместимые с GPL".
  14. Пересмотренные редакции настоящей Лицензии.
  Автор настоящей Лицензии время от времени может публиковать пересмотренные
 и (или) новые редакции Сетевой Публичной Лицензии Vitastor. Они будут аналогичны
 по смыслу настоящей редакции, но могут отличаться от нее в деталях, направленных
 на решение новых проблем или регулирование новых отношений.
  Каждой редакции присваивается собственный номер. Если для Программы указано,
 что к ней применима определенная редакция Сетевой Публичной Лицензии Vitastor
 "или любая более поздняя редакция", у Вас есть возможность использовать термины
 и условия, содержащиеся в редакции с указанным номером или любой более поздней
 редакции, опубликованной автором настоящей Лицензии. Если для Программы не
 указан номер редакции Сетевой Публичной Лицензии Vitastor, Вы можете выбрать
 любую редакцию, опубликованную автором настоящей Лицензии.
  Более поздние редакции Лицензии могут дать Вам дополнительные или принципиально
 иные права. Тем не менее в результате Вашего выбора более поздней редакции на
 автора или правообладателя не возлагается никаких дополнительных обязанностей.
  15. Отказ от гарантий.
  НА ПРОГРАММУ НЕ ПРЕДОСТАВЛЯЕТСЯ НИКАКИХ ГАРАНТИЙ ЗА ИСКЛЮЧЕНИЕМ ПРЕДУСМОТРЕННЫХ
 ДЕЙСТВУЮЩИМ ЗАКОНОДАТЕЛЬСТВОМ. ЕСЛИ ИНОЕ НЕ УКАЗАНО В ПИСЬМЕННОЙ ФОРМЕ,
 ПРАВООБЛАДАТЕЛИ И (ИЛИ) ТРЕТЬИ ЛИЦА ПРЕДОСТАВЛЯЮТ ПРОГРАММУ "КАК ЕСТЬ", БЕЗ
 КАКИХ-ЛИБО ЯВНЫХ ИЛИ ПОДРАЗУМЕВАЕМЫХ ГАРАНТИЙ, ВКЛЮЧАЯ ГАРАНТИИ ПРИГОДНОСТИ ДЛЯ
 КОНКРЕТНЫХ ЦЕЛЕЙ, НО НЕ ОГРАНИЧИВАЯСЬ ИМИ. ВЕСЬ РИСК, СВЯЗАННЫЙ С КАЧЕСТВОМ И
 ПРОИЗВОДИТЕЛЬНОСТЬЮ ПРОГРАММЫ, ВОЗЛАГАЕТСЯ НА ВАС. ЕСЛИ В ПРОГРАММЕ БУДУТ
 ВЫЯВЛЕНЫ НЕДОСТАТКИ, ВЫ ПРИНИМАЕТЕ НА СЕБЯ СТОИМОСТЬ ВСЕГО НЕОБХОДИМОГО
 ОБСЛУЖИВАНИЯ, РЕМОНТА ИЛИ ИСПРАВЛЕНИЯ.
  16. Ограничение ответственности.
  ЕСЛИ ИНОЕ НЕ ПРЕДУСМОТРЕНО ДЕЙСТВУЮЩИМ ЗАКОНОДАТЕЛЬСТВОМ ИЛИ СОГЛАШЕНИЕМ СТОРОН,
 ЗАКЛЮЧЕННЫМ В ПИСЬМЕННОЙ ФОРМЕ, ПРАВООБЛАДАТЕЛЬ ИЛИ ИНОЕ ЛИЦО, КОТОРОЕ ВНОСИТ
 ИЗМЕНЕНИЯ В ПРОГРАММУ И (ИЛИ) ПЕРЕДАЕТ ЕЁ НА УСЛОВИЯХ, СФОРМУЛИРОВАННЫХ ВЫШЕ, НЕ
 МОЖЕТ НЕСТИ ОТВЕТСТВЕННОСТЬ ПЕРЕД ВАМИ ЗА ПРИЧИНЕННЫЙ УЩЕРБ, ВКЛЮЧАЯ УЩЕРБ
 ОБЩЕГО ЛИБО КОНКРЕТНОГО ХАРАКТЕРА, ПРИЧИНЕННЫЙ СЛУЧАЙНО ИЛИ ЯВЛЯЮЩИЙСЯ
 СЛЕДСТВИЕМ ИСПОЛЬЗОВАНИЯ ПРОГРАММЫ ЛИБО НЕВОЗМОЖНОСТИ ЕЁ ИСПОЛЬЗОВАНИЯ (В ТОМ
 ЧИСЛЕ ЗА УНИЧТОЖЕНИЕ ИЛИ МОДИФИКАЦИЮ ИНФОРМАЦИИ, ЛИБО УБЫТКИ, ПОНЕСЕННЫЕ ВАМИ
 ИЛИ ТРЕТЬИМИ ЛИЦАМИ, ЛИБО СБОИ ПРОГРАММЫ ПРИ ВЗАИМОДЕЙСТВИИ С ДРУГИМ ПРОГРАММНЫМ
 ОБЕСПЕЧЕНИЕМ), В ТОМ ЧИСЛЕ И В СЛУЧАЯХ, КОГДА ПРАВООБЛАДАТЕЛЬ ИЛИ ТРЕТЬЕ ЛИЦО
 ПРЕДУПРЕЖДЕНЫ О ВОЗМОЖНОСТИ ПРИЧИНЕНИЯ ТАКИХ УБЫТКОВ.
  17. Толкование разделов 15 и 16.
  Если отказ от гарантии и ограничение ответственности, представленные выше, по
 закону не могут быть применены в соответствии с их условиями, суды,
 рассматривающие спор, должны применить действующий закон, который в наибольшей
 степени предусматривает абсолютный отказ от всей гражданской ответственности в
 связи с Программой, за исключением случаев, когда гарантия или принятие на себя
 ответственности за копию программы предоставляется за плату.
                        КОНЕЦ ОПРЕДЕЛЕНИЙ И УСЛОВИЙ
          Порядок применения условий Лицензии к Вашим программам
  Если Вы разрабатываете новую программу и хотите, чтобы её использование принесло
 максимальную пользу обществу, наилучший способ достичь этого -- сделать её
 свободной, чтобы все могли распространять и изменять её на условиях настоящей
 Лицензии.
  Для этого сделайте так, чтобы программа содержала в себе описанные ниже
 уведомления. Самым надежным способом это сделать является включение их в начало
 каждого файла исходного текста, чтобы наиболее эффективным образом сообщить об
 отсутствии гарантий; каждый файл должен иметь по меньшей мере одну строку с
 оповещением об авторских правах и указанием на то, где находится полный текст
 уведомлений.
    <Строка с названием Программы и информацией о её назначении.>
    Copyright © <год выпуска программы в свет>  <имя автора>
    Эта программа является свободным программным обеспечением: Вы можете
    распространять её и (или) изменять, соблюдая условия Сетевой Публичной
    Лицензии Vitastor, опубликованной автором Vitastor, либо редакции 1.1
    Лицензии, либо (на Ваше усмотрение) любой редакции, выпущенной позже.
    Эта программа распространяется в расчете на то, что она окажется полезной,
    но БЕЗ КАКИХ-ЛИБО ГАРАНТИЙ, включая подразумеваемую гарантию КАЧЕСТВА либо
    ПРИГОДНОСТИ ДЛЯ ОПРЕДЕЛЕННЫХ ЦЕЛЕЙ. Ознакомьтесь с Сетевой Публичной
    Лицензией Vitastor для получения более подробной информации.
  Также добавьте информацию о том, как связаться с Вами посредством электронной
 или обычной почты.
  Если ваша программа взаимодействует с пользователями удаленно через
 компьютерную сеть, Вы также должны убедиться, что обеспечили её пользователям
 возможность получить её исходные тексты. Например, если Ваша программа является
 веб-приложением, её интерфейс может отображать ссылку "Исходные коды", которая
 указывает на архив с текстом. Существует много способов, которыми Вы можете
 распространять исходные тексты, для разных программ подходят разные решения;
 ознакомьтесь с разделом 13 для того, чтобы узнать конкретные требования.
--- a/VNPL-1.1.txt
+++ b/VNPL-1.1.txt
@ -0,0 +1,648 @@
                     VITASTOR NETWORK PUBLIC LICENSE
                     Version 1.1,  6 February 2021
 Copyright (C) 2021 Vitaliy Filippov <vitalif@yourcmc.ru>
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.
                            Preamble
  The Vitastor Network Public License is a free, copyleft license for
 software and other kinds of works, specifically designed to ensure
 cooperation with the community in the case of network server software.
  The licenses for most software and other practical works are designed
 to take away your freedom to share and change the works.  By contrast,
 GNU General Public Licenses and Vitastor Network Public License are
 intended to guarantee your freedom to share and change all versions
 of a program--to make sure it remains free software for all its users.
  When we speak of free software, we are referring to freedom, not
 price.  GNU General Public Licenses and Vitastor Network Public License
 are designed to make sure that you have the freedom to distribute copies
 of free software (and charge for them if you wish), that you receive
 source code or can get it if you want it, that you can change the software
 or use pieces of it in new free programs, and that you know you can do these
 things.
  Developers that use GNU General Public Licenses and Vitastor
 Network Public License protect your rights with two steps:
 (1) assert copyright on the software, and (2) offer
 you this License which gives you legal permission to copy, distribute
 and/or modify the software.
  A secondary benefit of defending all users' freedom is that
 improvements made in alternate versions of the program, if they
 receive widespread use, become available for other developers to
 incorporate.  Many developers of free software are heartened and
 encouraged by the resulting cooperation.  However, in the case of
 software used on network servers, this result may fail to come about.
 The GNU General Public License permits making a modified version and
 letting the public access it on a server without ever releasing its
 source code to the public. Even the GNU Affero General Public License
 permits running a modified version in a closed environment where
 public users only interact with it through a closed-source proxy, again,
 without making the program and the proxy available to the public
 for free.
  The Vitastor Network Public License is designed specifically to
 ensure that, in such cases, the modified program and the proxy stays
 available to the community. It requires the operator of a network server to
 provide the source code of the original program and all other programs
 communicating with it running there to the users of that server.
 Therefore, public use of a modified version, on a server accessible
 directly or indirectly to the public, gives the public access to the source
 code of the modified version.
  The precise terms and conditions for copying, distribution and
 modification follow.
                       TERMS AND CONDITIONS
  0. Definitions.
  "This License" refers to version 1.1 of the Vitastor Network Public License.
  "Copyright" also means copyright-like laws that apply to other kinds of
 works, such as semiconductor masks.
  "The Program" refers to any copyrightable work licensed under this
 License.  Each licensee is addressed as "you".  "Licensees" and
 "recipients" may be individuals or organizations.
  To "modify" a work means to copy from or adapt all or part of the work
 in a fashion requiring copyright permission, other than the making of an
 exact copy.  The resulting work is called a "modified version" of the
 earlier work or a work "based on" the earlier work.
  A "covered work" means either the unmodified Program or a work based
 on the Program.
  To "propagate" a work means to do anything with it that, without
 permission, would make you directly or secondarily liable for
 infringement under applicable copyright law, except executing it on a
 computer or modifying a private copy.  Propagation includes copying,
 distribution (with or without modification), making available to the
 public, and in some countries other activities as well.
  To "convey" a work means any kind of propagation that enables other
 parties to make or receive copies.  Mere interaction with a user through
 a computer network, with no transfer of a copy, is not conveying.
  An interactive user interface displays "Appropriate Legal Notices"
 to the extent that it includes a convenient and prominently visible
 feature that (1) displays an appropriate copyright notice, and (2)
 tells the user that there is no warranty for the work (except to the
 extent that warranties are provided), that licensees may convey the
 work under this License, and how to view a copy of this License.  If
 the interface presents a list of user commands or options, such as a
 menu, a prominent item in the list meets this criterion.
  1. Source Code.
  The "source code" for a work means the preferred form of the work
 for making modifications to it.  "Object code" means any non-source
 form of a work.
  A "Standard Interface" means an interface that either is an official
 standard defined by a recognized standards body, or, in the case of
 interfaces specified for a particular programming language, one that
 is widely used among developers working in that language.
  The "System Libraries" of an executable work include anything, other
 than the work as a whole, that (a) is included in the normal form of
 packaging a Major Component, but which is not part of that Major
 Component, and (b) serves only to enable use of the work with that
 Major Component, or to implement a Standard Interface for which an
 implementation is available to the public in source code form.  A
 "Major Component", in this context, means a major essential component
 (kernel, window system, and so on) of the specific operating system
 (if any) on which the executable work runs, or a compiler used to
 produce the work, or an object code interpreter used to run it.
  The "Corresponding Source" for a work in object code form means all
 the source code needed to generate, install, and (for an executable
 work) run the object code and to modify the work, including scripts to
 control those activities.  However, it does not include the work's
 System Libraries, or general-purpose tools or generally available free
 programs which are used unmodified in performing those activities but
 which are not part of the work.  For example, Corresponding Source
 includes interface definition files associated with source files for
 the work, and the source code for shared libraries and dynamically
 linked subprograms that the work is specifically designed to require,
 such as by intimate data communication or control flow between those
 subprograms and other parts of the work.
  The Corresponding Source need not include anything that users
 can regenerate automatically from other parts of the Corresponding
 Source.
  The Corresponding Source for a work in source code form is that
 same work.
  2. Basic Permissions.
  All rights granted under this License are granted for the term of
 copyright on the Program, and are irrevocable provided the stated
 conditions are met.  This License explicitly affirms your unlimited
 permission to run the unmodified Program.  The output from running a
 covered work is covered by this License only if the output, given its
 content, constitutes a covered work.  This License acknowledges your
 rights of fair use or other equivalent, as provided by copyright law.
  You may make, run and propagate covered works that you do not
 convey, without conditions so long as your license otherwise remains
 in force.  You may convey covered works to others for the sole purpose
 of having them make modifications exclusively for you, or provide you
 with facilities for running those works, provided that you comply with
 the terms of this License in conveying all material for which you do
 not control copyright.  Those thus making or running the covered works
 for you must do so exclusively on your behalf, under your direction
 and control, on terms that prohibit them from making any copies of
 your copyrighted material outside their relationship with you.
  Conveying under any other circumstances is permitted solely under
 the conditions stated below.  Sublicensing is not allowed; section 10
 makes it unnecessary.
  3. Protecting Users' Legal Rights From Anti-Circumvention Law.
  No covered work shall be deemed part of an effective technological
 measure under any applicable law fulfilling obligations under article
 11 of the WIPO copyright treaty adopted on 20 December 1996, or
 similar laws prohibiting or restricting circumvention of such
 measures.
  When you convey a covered work, you waive any legal power to forbid
 circumvention of technological measures to the extent such circumvention
 is effected by exercising rights under this License with respect to
 the covered work, and you disclaim any intention to limit operation or
 modification of the work as a means of enforcing, against the work's
 users, your or third parties' legal rights to forbid circumvention of
 technological measures.
  4. Conveying Verbatim Copies.
  You may convey verbatim copies of the Program's source code as you
 receive it, in any medium, provided that you conspicuously and
 appropriately publish on each copy an appropriate copyright notice;
 keep intact all notices stating that this License and any
 non-permissive terms added in accord with section 7 apply to the code;
 keep intact all notices of the absence of any warranty; and give all
 recipients a copy of this License along with the Program.
  You may charge any price or no price for each copy that you convey,
 and you may offer support or warranty protection for a fee.
  5. Conveying Modified Source Versions.
  You may convey a work based on the Program, or the modifications to
 produce it from the Program, in the form of source code under the
 terms of section 4, provided that you also meet all of these conditions:
    a) The work must carry prominent notices stating that you modified
    it, and giving a relevant date.
    b) The work must carry prominent notices stating that it is
    released under this License and any conditions added under section
    7.  This requirement modifies the requirement in section 4 to
    "keep intact all notices".
    c) You must license the entire work, as a whole, under this
    License to anyone who comes into possession of a copy.  This
    License will therefore apply, along with any applicable section 7
    additional terms, to the whole of the work, and all its parts,
    regardless of how they are packaged.  This License gives no
    permission to license the work in any other way, but it does not
    invalidate such permission if you have separately received it.
    d) If the work has interactive user interfaces, each must display
    Appropriate Legal Notices; however, if the Program has interactive
    interfaces that do not display Appropriate Legal Notices, your
    work need not make them do so.
  A compilation of a covered work with other separate and independent
 works, which are not by their nature extensions of the covered work,
 and which are not combined with it such as to form a larger program,
 in or on a volume of a storage or distribution medium, is called an
 "aggregate" if the compilation and its resulting copyright are not
 used to limit the access or legal rights of the compilation's users
 beyond what the individual works permit.  Inclusion of a covered work
 in an aggregate does not cause this License to apply to the other
 parts of the aggregate.
  6. Conveying Non-Source Forms.
  You may convey a covered work in object code form under the terms
 of sections 4 and 5, provided that you also convey the
 machine-readable Corresponding Source under the terms of this License,
 in one of these ways:
    a) Convey the object code in, or embodied in, a physical product
    (including a physical distribution medium), accompanied by the
    Corresponding Source fixed on a durable physical medium
    customarily used for software interchange.
    b) Convey the object code in, or embodied in, a physical product
    (including a physical distribution medium), accompanied by a
    written offer, valid for at least three years and valid for as
    long as you offer spare parts or customer support for that product
    model, to give anyone who possesses the object code either (1) a
    copy of the Corresponding Source for all the software in the
    product that is covered by this License, on a durable physical
    medium customarily used for software interchange, for a price no
    more than your reasonable cost of physically performing this
    conveying of source, or (2) access to copy the
    Corresponding Source from a network server at no charge.
    c) Convey individual copies of the object code with a copy of the
    written offer to provide the Corresponding Source.  This
    alternative is allowed only occasionally and noncommercially, and
    only if you received the object code with such an offer, in accord
    with subsection 6b.
    d) Convey the object code by offering access from a designated
    place (gratis or for a charge), and offer equivalent access to the
    Corresponding Source in the same way through the same place at no
    further charge.  You need not require recipients to copy the
    Corresponding Source along with the object code.  If the place to
    copy the object code is a network server, the Corresponding Source
    may be on a different server (operated by you or a third party)
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    e) Convey the object code using peer-to-peer transmission, provided
    you inform other peers where the object code and Corresponding
    Source of the work are being offered to the general public at no
    charge under subsection 6d.
  A separable portion of the object code, whose source code is excluded
 from the Corresponding Source as a System Library, need not be
 included in conveying the object code work.
  A "User Product" is either (1) a "consumer product", which means any
 tangible personal property which is normally used for personal, family,
 or household purposes, or (2) anything designed or sold for incorporation
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  7. Additional Terms.
  "Additional permissions" are terms that supplement the terms of this
 License by making exceptions from one or more of its conditions.
 Additional permissions that are applicable to the entire Program shall
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  When you convey a copy of a covered work, you may at your option
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  10. Automatic Licensing of Downstream Recipients.
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  You may not impose any further restrictions on the exercise of the
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  11. Patents.
  A "contributor" is a copyright holder who authorizes use under this
 License of the Program or a work on which the Program is based.  The
 work thus licensed is called the contributor's "contributor version".
  A contributor's "essential patent claims" are all patent claims
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  In the following three paragraphs, a "patent license" is any express
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 (such as an express permission to practice a patent or covenant not to
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 party means to make such an agreement or commitment not to enforce a
 patent against the party.
  If you convey a covered work, knowingly relying on a patent license,
 and the Corresponding Source of the work is not available for anyone
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 publicly available network server or other readily accessible means,
 then you must either (1) cause the Corresponding Source to be so
 available, or (2) arrange to deprive yourself of the benefit of the
 patent license for this particular work, or (3) arrange, in a manner
 consistent with the requirements of this License, to extend the patent
 license to downstream recipients.  "Knowingly relying" means you have
 actual knowledge that, but for the patent license, your conveying the
 covered work in a country, or your recipient's use of the covered work
 in a country, would infringe one or more identifiable patents in that
 country that you have reason to believe are valid.
  If, pursuant to or in connection with a single transaction or
 arrangement, you convey, or propagate by procuring conveyance of, a
 covered work, and grant a patent license to some of the parties
 receiving the covered work authorizing them to use, propagate, modify
 or convey a specific copy of the covered work, then the patent license
 you grant is automatically extended to all recipients of the covered
 work and works based on it.
  A patent license is "discriminatory" if it does not include within
 the scope of its coverage, prohibits the exercise of, or is
 conditioned on the non-exercise of one or more of the rights that are
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 in the business of distributing software, under which you make payment
 to the third party based on the extent of your activity of conveying
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 or that patent license was granted, prior to 28 March 2007.
  Nothing in this License shall be construed as excluding or limiting
 any implied license or other defenses to infringement that may
 otherwise be available to you under applicable patent law.
  12. No Surrender of Others' Freedom.
  If conditions are imposed on you (whether by court order, agreement or
 otherwise) that contradict the conditions of this License, they do not
 excuse you from the conditions of this License.  If you cannot convey a
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 License and any other pertinent obligations, then as a consequence you may
 not convey it at all.  For example, if you agree to terms that obligate you
 to collect a royalty for further conveying from those to whom you convey
 the Program, the only way you could satisfy both those terms and this
 License would be to refrain entirely from conveying the Program.
  13. Remote Network Interaction.
  A "Proxy Program" means a separate program which is specially designed to
 be used in conjunction with the covered work and interacts with it directly
 or indirectly through any kind of API (application programming interfaces),
 a computer network, an imitation of such network, or another Proxy Program
 itself.
  Notwithstanding any other provision of this License, if you provide any user
 with an opportunity to interact with the covered work through a computer
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 you must prominently offer that user an opportunity to receive the
 Corresponding Source of the covered work and all Proxy Programs from a
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 the Corresponding Source for all Proxy Programs must be made available
 under the conditions of either this License or any GPL-Compatible
 Free Software License, as described by the Free Software Foundation
 in their "GPL-Compatible License List".
  14. Revised Versions of this License.
  Vitastor Author may publish revised and/or new versions of
 the Vitastor Network Public License from time to time.  Such new versions
 will be similar in spirit to the present version, but may differ in detail to
 address new problems or concerns.
  Each version is given a distinguishing version number.  If the
 Program specifies that a certain numbered version of the Vitastor Network
 Public License "or any later version" applies to it, you have the
 option of following the terms and conditions either of that numbered
 version or of any later version. If the Program does not specify a version
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 ever published.
  Later license versions may give you additional or different
 permissions.  However, no additional obligations are imposed on any
 author or copyright holder as a result of your choosing to follow a
 later version.
  15. Disclaimer of Warranty.
  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
 APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
 HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
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 IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
 ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
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  17. Interpretation of Sections 15 and 16.
  If the disclaimer of warranty and limitation of liability provided
 above cannot be given local legal effect according to their terms,
 reviewing courts shall apply local law that most closely approximates
 an absolute waiver of all civil liability in connection with the
 Program, unless a warranty or assumption of liability accompanies a
 copy of the Program in return for a fee.
                     END OF TERMS AND CONDITIONS
            How to Apply These Terms to Your New Programs
  If you develop a new program, and you want it to be of the greatest
 possible use to the public, the best way to achieve this is to make it
 free software which everyone can redistribute and change under these terms.
  To do so, attach the following notices to the program.  It is safest
 to attach them to the start of each source file to most effectively
 state the exclusion of warranty; and each file should have at least
 the "copyright" line and a pointer to where the full notice is found.
    <one line to give the program's name and a brief idea of what it does.>
    Copyright (C) <year>  <name of author>
    This program is free software: you can redistribute it and/or modify
    it under the terms of the Vitastor Network Public License as published by
    the Vitastor Author, either version 1.1 of the License, or
    (at your option) any later version.
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    Vitastor Network Public License for more details.
 Also add information on how to contact you by electronic and paper mail.
  If your software can interact with users remotely through a computer
 network, you should also make sure that it provides a way for users to
 get its source.  For example, if your program is a web application, its
 interface could display a "Source" link that leads users to an archive
 of the code.  There are many ways you could offer source, and different
 solutions will be better for different programs; see section 13 for the
 specific requirements.
--- a/allocator.cpp
+++ b/allocator.cpp
@ -1,127 +0,0 @@
 #include <stdexcept>
 #include "allocator.h"
 #include <stdlib.h>
 #include <malloc.h>
 allocator::allocator(uint64_t blocks)
 {
    if (blocks >= 0x80000000 || blocks <= 1)
    {
        throw std::invalid_argument("blocks");
    }
    uint64_t p2 = 1, total = 1;
    while (p2 * 64 < blocks)
    {
        p2 = p2 * 64;
        total += p2;
    }
    total -= p2;
    total += (blocks+63) / 64;
    mask = new uint64_t[2 + total];
    size = free = blocks;
    last_one_mask = (blocks % 64) == 0
        ? UINT64_MAX
        : ~(UINT64_MAX << (64 - blocks % 64));
    for (uint64_t i = 0; i < total; i++)
    {
        mask[i] = 0;
    }
 }
 allocator::~allocator()
 {
    delete[] mask;
 }
 void allocator::set(uint64_t addr, bool value)
 {
    if (addr >= size)
    {
        return;
    }
    uint64_t p2 = 1, offset = 0;
    while (p2 * 64 < size)
    {
        offset += p2;
        p2 = p2 * 64;
    }
    uint64_t cur_addr = addr;
    bool is_last = true;
    uint64_t value64 = value ? 1 : 0;
    while (1)
    {
        uint64_t last = offset + cur_addr/64;
        uint64_t bit = cur_addr % 64;
        if (((mask[last] >> bit) & 1) != value64)
        {
            if (is_last)
            {
                free += value ? -1 : 1;
            }
            if (value)
            {
                mask[last] = mask[last] | (1l << bit);
                if (mask[last] != (!is_last || cur_addr/64 < size/64
                    ? UINT64_MAX : last_one_mask))
                {
                    break;
                }
            }
            else
            {
                mask[last] = mask[last] & ~(1l << bit);
            }
            is_last = false;
            if (p2 > 1)
            {
                p2 = p2 / 64;
                offset -= p2;
                cur_addr /= 64;
            }
            else
            {
                break;
            }
        }
        else
        {
            break;
        }
    }
 }
 uint64_t allocator::find_free()
 {
    uint64_t p2 = 1, offset = 0, addr = 0, f, i;
    while (p2 < size)
    {
        uint64_t m = mask[offset + addr];
        for (i = 0, f = 1; i < 64; i++, f <<= 1)
        {
            if (!(m & f))
            {
                break;
            }
        }
        if (i == 64)
        {
            // No space
            return UINT64_MAX;
        }
        addr = (addr * 64) | i;
        if (addr >= size)
        {
            // No space
            return UINT64_MAX;
        }
        offset += p2;
        p2 = p2 * 64;
    }
    return addr;
 }
 uint64_t allocator::get_free_count()
 {
    return free;
 }
--- a/allocator.h
+++ b/allocator.h
@ -1,18 +0,0 @@
 #pragma once
 #include <stdint.h>
 // Hierarchical bitmap allocator
 class allocator
 {
    uint64_t size;
    uint64_t free;
    uint64_t last_one_mask;
    uint64_t *mask;
 public:
    allocator(uint64_t blocks);
    ~allocator();
    void set(uint64_t addr, bool value);
    uint64_t find_free();
    uint64_t get_free_count();
 };
--- a/base64.cpp
+++ b/base64.cpp
@ -1,52 +0,0 @@
 #include "base64.h"
 std::string base64_encode(const std::string &in)
 {
    std::string out;
    unsigned val = 0;
    int valb = -6;
    for (unsigned char c: in)
    {
        val = (val << 8) + c;
        valb += 8;
        while (valb >= 0)
        {
            out.push_back("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"[(val>>valb) & 0x3F]);
            valb -= 6;
        }
    }
    if (valb > -6)
        out.push_back("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"[((val<<8)>>(valb+8)) & 0x3F]);
    while (out.size() % 4)
        out.push_back('=');
    return out;
 }
 static char T[256] = { 0 };
 std::string base64_decode(const std::string &in)
 {
    std::string out;
    if (T[0] == 0)
    {
        for (int i = 0; i < 256; i++)
            T[i] = -1;
        for (int i = 0; i < 64; i++)
            T[(unsigned char)("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"[i])] = i;
    }
    unsigned val = 0;
    int valb = -8;
    for (unsigned char c: in)
    {
        if (T[c] == -1)
            break;
        val = (val<<6) + T[c];
        valb += 6;
        if (valb >= 0)
        {
            out.push_back(char((val >> valb) & 0xFF));
            valb -= 8;
        }
    }
    return out;
 }
--- a/base64.h
+++ b/base64.h
@ -1,5 +0,0 @@
 #pragma once
 #include <string>
 std::string base64_encode(const std::string &in);
 std::string base64_decode(const std::string &in);
--- a/blockstore.cpp
+++ b/blockstore.cpp
@ -1,66 +0,0 @@
 #include "blockstore_impl.h"
 blockstore_t::blockstore_t(blockstore_config_t & config, ring_loop_t *ringloop)
 {
    impl = new blockstore_impl_t(config, ringloop);
 }
 blockstore_t::~blockstore_t()
 {
    delete impl;
 }
 void blockstore_t::loop()
 {
    impl->loop();
 }
 bool blockstore_t::is_started()
 {
    return impl->is_started();
 }
 bool blockstore_t::is_stalled()
 {
    return impl->is_stalled();
 }
 bool blockstore_t::is_safe_to_stop()
 {
    return impl->is_safe_to_stop();
 }
 void blockstore_t::enqueue_op(blockstore_op_t *op)
 {
    impl->enqueue_op(op, false);
 }
 void blockstore_t::enqueue_op_first(blockstore_op_t *op)
 {
    impl->enqueue_op(op, true);
 }
 std::unordered_map<object_id, uint64_t> & blockstore_t::get_unstable_writes()
 {
    return impl->unstable_writes;
 }
 uint32_t blockstore_t::get_block_size()
 {
    return impl->get_block_size();
 }
 uint64_t blockstore_t::get_block_count()
 {
    return impl->get_block_count();
 }
 uint64_t blockstore_t::get_free_block_count()
 {
    return impl->get_free_block_count();
 }
 uint32_t blockstore_t::get_disk_alignment()
 {
    return impl->get_disk_alignment();
 }
--- a/blockstore_flush.cpp
+++ b/blockstore_flush.cpp
@ -1,780 +0,0 @@
 #include "blockstore_impl.h"
 journal_flusher_t::journal_flusher_t(int flusher_count, blockstore_impl_t *bs)
 {
    this->bs = bs;
    this->flusher_count = flusher_count;
    dequeuing = false;
    active_flushers = 0;
    syncing_flushers = 0;
    flusher_start_threshold = bs->journal_block_size / sizeof(journal_entry_stable);
    journal_trim_interval = flusher_start_threshold;
    journal_trim_counter = 0;
    journal_superblock = bs->journal.inmemory ? bs->journal.buffer : memalign(MEM_ALIGNMENT, bs->journal_block_size);
    co = new journal_flusher_co[flusher_count];
    for (int i = 0; i < flusher_count; i++)
    {
        co[i].bs = bs;
        co[i].flusher = this;
    }
 }
 journal_flusher_co::journal_flusher_co()
 {
    wait_state = 0;
    simple_callback_r = [this](ring_data_t* data)
    {
        bs->live = true;
        if (data->res != data->iov.iov_len)
        {
            throw std::runtime_error(
                "data read operation failed during flush ("+std::to_string(data->res)+" != "+std::to_string(data->iov.iov_len)+
                "). can't continue, sorry :-("
            );
        }
        wait_count--;
    };
    simple_callback_w = [this](ring_data_t* data)
    {
        bs->live = true;
        if (data->res != data->iov.iov_len)
        {
            throw std::runtime_error(
                "write operation failed ("+std::to_string(data->res)+" != "+std::to_string(data->iov.iov_len)+
                "). state "+std::to_string(wait_state)+". in-memory state is corrupted. AAAAAAAaaaaaaaaa!!!111"
            );
        }
        wait_count--;
    };
 }
 journal_flusher_t::~journal_flusher_t()
 {
    if (!bs->journal.inmemory)
        free(journal_superblock);
    delete[] co;
 }
 bool journal_flusher_t::is_active()
 {
    return active_flushers > 0 || dequeuing;
 }
 void journal_flusher_t::loop()
 {
    for (int i = 0; (active_flushers > 0 || dequeuing) && i < flusher_count; i++)
    {
        co[i].loop();
    }
 }
 void journal_flusher_t::enqueue_flush(obj_ver_id ov)
 {
    auto it = flush_versions.find(ov.oid);
    if (it != flush_versions.end())
    {
        if (it->second < ov.version)
            it->second = ov.version;
    }
    else
    {
        flush_versions[ov.oid] = ov.version;
        flush_queue.push_back(ov.oid);
    }
    if (!dequeuing && flush_queue.size() >= flusher_start_threshold)
    {
        dequeuing = true;
        bs->ringloop->wakeup();
    }
 }
 void journal_flusher_t::unshift_flush(obj_ver_id ov)
 {
    auto it = flush_versions.find(ov.oid);
    if (it != flush_versions.end())
    {
        if (it->second < ov.version)
            it->second = ov.version;
    }
    else
    {
        flush_versions[ov.oid] = ov.version;
        flush_queue.push_front(ov.oid);
    }
    if (!dequeuing && flush_queue.size() >= flusher_start_threshold)
    {
        dequeuing = true;
        bs->ringloop->wakeup();
    }
 }
 void journal_flusher_t::request_trim()
 {
    dequeuing = true;
    trim_wanted++;
    bs->ringloop->wakeup();
 }
 void journal_flusher_t::release_trim()
 {
    trim_wanted--;
 }
 #define await_sqe(label) \
    resume_##label:\
        sqe = bs->get_sqe();\
        if (!sqe)\
        {\
            wait_state = label;\
            return false;\
        }\
        data = ((ring_data_t*)sqe->user_data);
 // FIXME: Implement batch flushing
 bool journal_flusher_co::loop()
 {
    // This is much better than implementing the whole function as an FSM
    // Maybe I should consider a coroutine library like https://github.com/hnes/libaco ...
    if (wait_state == 1)
        goto resume_1;
    else if (wait_state == 2)
        goto resume_2;
    else if (wait_state == 3)
        goto resume_3;
    else if (wait_state == 4)
        goto resume_4;
    else if (wait_state == 5)
        goto resume_5;
    else if (wait_state == 6)
        goto resume_6;
    else if (wait_state == 7)
        goto resume_7;
    else if (wait_state == 8)
        goto resume_8;
    else if (wait_state == 9)
        goto resume_9;
    else if (wait_state == 10)
        goto resume_10;
    else if (wait_state == 12)
        goto resume_12;
    else if (wait_state == 13)
        goto resume_13;
    else if (wait_state == 14)
        goto resume_14;
    else if (wait_state == 15)
        goto resume_15;
    else if (wait_state == 16)
        goto resume_16;
    else if (wait_state == 17)
        goto resume_17;
    else if (wait_state == 18)
        goto resume_18;
 resume_0:
    if (!flusher->flush_queue.size() || !flusher->dequeuing)
    {
        flusher->dequeuing = false;
        wait_state = 0;
        return true;
    }
    cur.oid = flusher->flush_queue.front();
    cur.version = flusher->flush_versions[cur.oid];
    flusher->flush_queue.pop_front();
    flusher->flush_versions.erase(cur.oid);
    dirty_end = bs->dirty_db.find(cur);
    if (dirty_end != bs->dirty_db.end())
    {
        if (dirty_end->second.journal_sector >= bs->journal.dirty_start &&
            (bs->journal.dirty_start >= bs->journal.used_start ||
            dirty_end->second.journal_sector < bs->journal.used_start))
        {
            flusher->enqueue_flush(cur);
            // We can't flush journal sectors that are still written to
            // However, as we group flushes by oid, current oid may have older writes to flush!
            // And it may even block writes if we don't flush the older version
            // (if it's in the beginning of the journal)...
            // So first try to find an older version of the same object to flush.
            bool found = false;
            while (dirty_end != bs->dirty_db.begin())
            {
                dirty_end--;
                if (dirty_end->first.oid != cur.oid)
                {
                    break;
                }
                if (!(dirty_end->second.journal_sector >= bs->journal.dirty_start &&
                    (bs->journal.dirty_start >= bs->journal.used_start ||
                    dirty_end->second.journal_sector < bs->journal.used_start)))
                {
                    found = true;
                    cur.version = dirty_end->first.version;
                    break;
                }
            }
            if (!found)
            {
                // Try other objects
                int search_left = flusher->flush_queue.size() - 1;
 #ifdef BLOCKSTORE_DEBUG
                printf("Flusher overran writers (dirty_start=%08lx) - searching for older flushes (%d left)\n", bs->journal.dirty_start, search_left);
 #endif
                while (search_left > 0)
                {
                    cur.oid = flusher->flush_queue.front();
                    cur.version = flusher->flush_versions[cur.oid];
                    flusher->flush_queue.pop_front();
                    flusher->flush_versions.erase(cur.oid);
                    dirty_end = bs->dirty_db.find(cur);
                    if (dirty_end != bs->dirty_db.end())
                    {
                        if (dirty_end->second.journal_sector >= bs->journal.dirty_start &&
                            (bs->journal.dirty_start >= bs->journal.used_start ||
                            dirty_end->second.journal_sector < bs->journal.used_start))
                        {
 #ifdef BLOCKSTORE_DEBUG
                            printf("Write %lu:%lu v%lu is too new: offset=%08lx\n", cur.oid.inode, cur.oid.stripe, cur.version, dirty_end->second.journal_sector);
 #endif
                            flusher->enqueue_flush(cur);
                        }
                        else
                        {
                            break;
                        }
                    }
                    search_left--;
                }
                if (search_left <= 0)
                {
 #ifdef BLOCKSTORE_DEBUG
                    printf("No older flushes, stopping\n");
 #endif
                    flusher->dequeuing = false;
                    wait_state = 0;
                    return true;
                }
            }
        }
        repeat_it = flusher->sync_to_repeat.find(cur.oid);
        if (repeat_it != flusher->sync_to_repeat.end())
        {
 #ifdef BLOCKSTORE_DEBUG
            printf("Postpone %lu:%lu v%lu\n", cur.oid.inode, cur.oid.stripe, cur.version);
 #endif
            // We don't flush different parts of history of the same object in parallel
            // So we check if someone is already flushing this object
            // In that case we set sync_to_repeat and pick another object
            // Another coroutine will see it and re-queue the object after it finishes
            if (repeat_it->second < cur.version)
                repeat_it->second = cur.version;
            wait_state = 0;
            goto resume_0;
        }
        else
            flusher->sync_to_repeat[cur.oid] = 0;
 #ifdef BLOCKSTORE_DEBUG
        printf("Flushing %lu:%lu v%lu\n", cur.oid.inode, cur.oid.stripe, cur.version);
 #endif
        flusher->active_flushers++;
 resume_1:
        // Find it in clean_db
        clean_it = bs->clean_db.find(cur.oid);
        old_clean_loc = (clean_it != bs->clean_db.end() ? clean_it->second.location : UINT64_MAX);
        // Scan dirty versions of the object
        if (!scan_dirty(1))
        {
            wait_state += 1;
            return false;
        }
        // Writes and deletes shouldn't happen at the same time
        assert(!(copy_count > 0 || has_writes) || !has_delete);
        if (copy_count == 0 && !has_writes && !has_delete || has_delete && old_clean_loc == UINT64_MAX)
        {
            // Nothing to flush
            bs->erase_dirty(dirty_start, std::next(dirty_end), clean_loc);
            goto trim_journal;
        }
        if (clean_loc == UINT64_MAX)
        {
            if (old_clean_loc == UINT64_MAX)
            {
                // Object not allocated. This is a bug.
                char err[1024];
                snprintf(
                    err, 1024, "BUG: Object %lu:%lu v%lu that we are trying to flush is not allocated on the data device",
                    cur.oid.inode, cur.oid.stripe, cur.version
                );
                throw std::runtime_error(err);
            }
            else
            {
                clean_loc = old_clean_loc;
            }
        }
        // Also we need to submit metadata read(s). We do read-modify-write cycle(s) for every operation.
    resume_2:
        if (!modify_meta_read(clean_loc, meta_new, 2))
        {
            wait_state += 2;
            return false;
        }
        if (old_clean_loc != UINT64_MAX && old_clean_loc != clean_loc)
        {
        resume_14:
            if (!modify_meta_read(old_clean_loc, meta_old, 14))
            {
                wait_state += 14;
                return false;
            }
        }
        else
            meta_old.submitted = false;
    resume_3:
        if (wait_count > 0)
        {
            wait_state = 3;
            return false;
        }
        if (meta_new.submitted)
        {
            meta_new.it->second.state = 1;
            bs->ringloop->wakeup();
        }
        if (meta_old.submitted)
        {
            meta_old.it->second.state = 1;
            bs->ringloop->wakeup();
        }
        // Reads completed, submit writes and set bitmap bits
        if (bs->clean_entry_bitmap_size)
        {
            new_clean_bitmap = (bs->inmemory_meta
                ? meta_new.buf + meta_new.pos*bs->clean_entry_size + sizeof(clean_disk_entry)
                : bs->clean_bitmap + (clean_loc >> bs->block_order)*bs->clean_entry_bitmap_size);
            if (clean_init_bitmap)
            {
                memset(new_clean_bitmap, 0, bs->clean_entry_bitmap_size);
                bitmap_set(new_clean_bitmap, clean_bitmap_offset, clean_bitmap_len);
            }
        }
        for (it = v.begin(); it != v.end(); it++)
        {
            if (new_clean_bitmap)
            {
                bitmap_set(new_clean_bitmap, it->offset, it->len);
            }
            await_sqe(4);
            data->iov = (struct iovec){ it->buf, (size_t)it->len };
            data->callback = simple_callback_w;
            my_uring_prep_writev(
                sqe, bs->data_fd, &data->iov, 1, bs->data_offset + clean_loc + it->offset
            );
            wait_count++;
        }
        // Sync data before writing metadata
    resume_16:
    resume_17:
    resume_18:
        if (copy_count && !fsync_batch(false, 16))
        {
            wait_state += 16;
            return false;
        }
    resume_5:
        // And metadata writes, but only after data writes complete
        if (!bs->inmemory_meta && meta_new.it->second.state == 0 || wait_count > 0)
        {
            // metadata sector is still being read or data is still being written, wait for it
            wait_state = 5;
            return false;
        }
        if (old_clean_loc != UINT64_MAX && old_clean_loc != clean_loc)
        {
            if (!bs->inmemory_meta && meta_old.it->second.state == 0)
            {
                wait_state = 5;
                return false;
            }
            memset(meta_old.buf + meta_old.pos*bs->clean_entry_size, 0, bs->clean_entry_size);
            await_sqe(15);
            data->iov = (struct iovec){ meta_old.buf, bs->meta_block_size };
            data->callback = simple_callback_w;
            my_uring_prep_writev(
                sqe, bs->meta_fd, &data->iov, 1, bs->meta_offset + meta_old.sector
            );
            wait_count++;
        }
        if (has_delete)
        {
            memset(meta_new.buf + meta_new.pos*bs->clean_entry_size, 0, bs->clean_entry_size);
        }
        else
        {
            clean_disk_entry *new_entry = (clean_disk_entry*)(meta_new.buf + meta_new.pos*bs->clean_entry_size);
            assert(new_entry->oid.inode == 0 || new_entry->oid == cur.oid);
            new_entry->oid = cur.oid;
            new_entry->version = cur.version;
            if (!bs->inmemory_meta)
            {
                memcpy(&new_entry->bitmap, new_clean_bitmap, bs->clean_entry_bitmap_size);
            }
        }
        await_sqe(6);
        data->iov = (struct iovec){ meta_new.buf, bs->meta_block_size };
        data->callback = simple_callback_w;
        my_uring_prep_writev(
            sqe, bs->meta_fd, &data->iov, 1, bs->meta_offset + meta_new.sector
        );
        wait_count++;
    resume_7:
        if (wait_count > 0)
        {
            wait_state = 7;
            return false;
        }
        // Done, free all buffers
        if (!bs->inmemory_meta)
        {
            meta_new.it->second.usage_count--;
            if (meta_new.it->second.usage_count == 0)
            {
                free(meta_new.it->second.buf);
                flusher->meta_sectors.erase(meta_new.it);
            }
            if (old_clean_loc != UINT64_MAX && old_clean_loc != clean_loc)
            {
                meta_old.it->second.usage_count--;
                if (meta_old.it->second.usage_count == 0)
                {
                    free(meta_old.it->second.buf);
                    flusher->meta_sectors.erase(meta_old.it);
                }
            }
        }
        for (it = v.begin(); it != v.end(); it++)
        {
            free(it->buf);
        }
        v.clear();
        // And sync metadata (in batches - not per each operation!)
    resume_8:
    resume_9:
    resume_10:
        if (!fsync_batch(true, 8))
        {
            wait_state += 8;
            return false;
        }
        // Update clean_db and dirty_db, free old data locations
        update_clean_db();
    trim_journal:
        // Clear unused part of the journal every <journal_trim_interval> flushes
        if (!((++flusher->journal_trim_counter) % flusher->journal_trim_interval) || flusher->trim_wanted > 0)
        {
            flusher->journal_trim_counter = 0;
            if (bs->journal.trim())
            {
                // Update journal "superblock"
                await_sqe(12);
                *((journal_entry_start*)flusher->journal_superblock) = {
                    .crc32 = 0,
                    .magic = JOURNAL_MAGIC,
                    .type = JE_START,
                    .size = sizeof(journal_entry_start),
                    .reserved = 0,
                    .journal_start = bs->journal.used_start,
                };
                ((journal_entry_start*)flusher->journal_superblock)->crc32 = je_crc32((journal_entry*)flusher->journal_superblock);
                data->iov = (struct iovec){ flusher->journal_superblock, bs->journal_block_size };
                data->callback = simple_callback_w;
                my_uring_prep_writev(sqe, bs->journal.fd, &data->iov, 1, bs->journal.offset);
                wait_count++;
            resume_13:
                if (wait_count > 0)
                {
                    wait_state = 13;
                    return false;
                }
            }
        }
        // All done
 #ifdef BLOCKSTORE_DEBUG
        printf("Flushed %lu:%lu v%lu (%ld left)\n", cur.oid.inode, cur.oid.stripe, cur.version, flusher->flush_queue.size());
 #endif
        flusher->active_flushers--;
        repeat_it = flusher->sync_to_repeat.find(cur.oid);
        if (repeat_it != flusher->sync_to_repeat.end() && repeat_it->second > cur.version)
        {
            // Requeue version
            flusher->unshift_flush({ .oid = cur.oid, .version = repeat_it->second });
        }
        flusher->sync_to_repeat.erase(repeat_it);
        wait_state = 0;
        goto resume_0;
    }
    return true;
 }
 bool journal_flusher_co::scan_dirty(int wait_base)
 {
    if (wait_state == wait_base)
    {
        goto resume_0;
    }
    dirty_it = dirty_start = dirty_end;
    v.clear();
    wait_count = 0;
    copy_count = 0;
    clean_loc = UINT64_MAX;
    has_delete = false;
    has_writes = false;
    skip_copy = false;
    clean_init_bitmap = false;
    while (1)
    {
        if (dirty_it->second.state == ST_J_STABLE && !skip_copy)
        {
            // First we submit all reads
            has_writes = true;
            if (dirty_it->second.len != 0)
            {
                offset = dirty_it->second.offset;
                end_offset = dirty_it->second.offset + dirty_it->second.len;
                it = v.begin();
                while (1)
                {
                    for (; it != v.end(); it++)
                        if (it->offset >= offset)
                            break;
                    if (it == v.end() || it->offset > offset && it->len > 0)
                    {
                        submit_offset = dirty_it->second.location + offset - dirty_it->second.offset;
                        submit_len = it == v.end() || it->offset >= end_offset ? end_offset-offset : it->offset-offset;
                        it = v.insert(it, (copy_buffer_t){ .offset = offset, .len = submit_len, .buf = memalign(MEM_ALIGNMENT, submit_len) });
                        copy_count++;
                        if (bs->journal.inmemory)
                        {
                            // Take it from memory
                            memcpy(v.back().buf, bs->journal.buffer + submit_offset, submit_len);
                        }
                        else
                        {
                            // Read it from disk
                            await_sqe(0);
                            data->iov = (struct iovec){ v.back().buf, (size_t)submit_len };
                            data->callback = simple_callback_r;
                            my_uring_prep_readv(
                                sqe, bs->journal.fd, &data->iov, 1, bs->journal.offset + submit_offset
                            );
                            wait_count++;
                        }
                    }
                    offset = it->offset+it->len;
                    if (it == v.end() || offset >= end_offset)
                        break;
                }
            }
        }
        else if (dirty_it->second.state == ST_D_STABLE && !skip_copy)
        {
            // There is an unflushed big write. Copy small writes in its position
            has_writes = true;
            clean_loc = dirty_it->second.location;
            clean_init_bitmap = true;
            clean_bitmap_offset = dirty_it->second.offset;
            clean_bitmap_len = dirty_it->second.len;
            skip_copy = true;
        }
        else if (dirty_it->second.state == ST_DEL_STABLE && !skip_copy)
        {
            // There is an unflushed delete
            has_delete = true;
            skip_copy = true;
        }
        else if (!IS_STABLE(dirty_it->second.state))
        {
            char err[1024];
            snprintf(
                err, 1024, "BUG: Unexpected dirty_entry %lu:%lu v%lu state during flush: %d",
                dirty_it->first.oid.inode, dirty_it->first.oid.stripe, dirty_it->first.version, dirty_it->second.state
            );
            throw std::runtime_error(err);
        }
        dirty_start = dirty_it;
        if (dirty_it == bs->dirty_db.begin())
        {
            break;
        }
        dirty_it--;
        if (dirty_it->first.oid != cur.oid)
        {
            break;
        }
    }
    return true;
 }
 bool journal_flusher_co::modify_meta_read(uint64_t meta_loc, flusher_meta_write_t &wr, int wait_base)
 {
    if (wait_state == wait_base)
    {
        goto resume_0;
    }
    // We must check if the same sector is already in memory if we don't keep all metadata in memory all the time.
    // And yet another option is to use LSM trees for metadata, but it sophisticates everything a lot,
    // so I'll avoid it as long as I can.
    wr.submitted = false;
    wr.sector = ((meta_loc >> bs->block_order) / (bs->meta_block_size / bs->clean_entry_size)) * bs->meta_block_size;
    wr.pos = ((meta_loc >> bs->block_order) % (bs->meta_block_size / bs->clean_entry_size));
    if (bs->inmemory_meta)
    {
        wr.buf = bs->metadata_buffer + wr.sector;
        return true;
    }
    wr.it = flusher->meta_sectors.find(wr.sector);
    if (wr.it == flusher->meta_sectors.end())
    {
        // Not in memory yet, read it
        wr.buf = memalign(MEM_ALIGNMENT, bs->meta_block_size);
        wr.it = flusher->meta_sectors.emplace(wr.sector, (meta_sector_t){
            .offset = wr.sector,
            .len = bs->meta_block_size,
            .state = 0, // 0 = not read yet
            .buf = wr.buf,
            .usage_count = 1,
        }).first;
        await_sqe(0);
        data->iov = (struct iovec){ wr.it->second.buf, bs->meta_block_size };
        data->callback = simple_callback_r;
        wr.submitted = true;
        my_uring_prep_readv(
            sqe, bs->meta_fd, &data->iov, 1, bs->meta_offset + wr.sector
        );
        wait_count++;
    }
    else
    {
        wr.buf = wr.it->second.buf;
        wr.it->second.usage_count++;
    }
    return true;
 }
 void journal_flusher_co::update_clean_db()
 {
    if (old_clean_loc != UINT64_MAX && old_clean_loc != clean_loc)
    {
 #ifdef BLOCKSTORE_DEBUG
        printf("Free block %lu\n", old_clean_loc >> bs->block_order);
 #endif
        bs->data_alloc->set(old_clean_loc >> bs->block_order, false);
    }
    if (has_delete)
    {
        auto clean_it = bs->clean_db.find(cur.oid);
        bs->clean_db.erase(clean_it);
        bs->data_alloc->set(clean_loc >> bs->block_order, false);
        clean_loc = UINT64_MAX;
    }
    else
    {
        bs->clean_db[cur.oid] = {
            .version = cur.version,
            .location = clean_loc,
        };
    }
    bs->erase_dirty(dirty_start, std::next(dirty_end), clean_loc);
 }
 bool journal_flusher_co::fsync_batch(bool fsync_meta, int wait_base)
 {
    if (wait_state == wait_base)
        goto resume_0;
    else if (wait_state == wait_base+1)
        goto resume_1;
    else if (wait_state == wait_base+2)
        goto resume_2;
    if (!(fsync_meta ? bs->disable_meta_fsync : bs->disable_journal_fsync))
    {
        cur_sync = flusher->syncs.end();
        while (cur_sync != flusher->syncs.begin())
        {
            cur_sync--;
            if (cur_sync->fsync_meta == fsync_meta && cur_sync->state == 0)
            {
                goto sync_found;
            }
        }
        cur_sync = flusher->syncs.emplace(flusher->syncs.end(), (flusher_sync_t){
            .fsync_meta = fsync_meta,
            .ready_count = 0,
            .state = 0,
        });
    sync_found:
        cur_sync->ready_count++;
        flusher->syncing_flushers++;
        if (flusher->syncing_flushers >= flusher->flusher_count || !flusher->flush_queue.size())
        {
            // Sync batch is ready. Do it.
            await_sqe(0);
            data->iov = { 0 };
            data->callback = simple_callback_w;
            my_uring_prep_fsync(sqe, fsync_meta ? bs->meta_fd : bs->data_fd, IORING_FSYNC_DATASYNC);
            cur_sync->state = 1;
            wait_count++;
        resume_1:
            if (wait_count > 0)
            {
                wait_state = 1;
                return false;
            }
            // Sync completed. All previous coroutines waiting for it must be resumed
            cur_sync->state = 2;
            bs->ringloop->wakeup();
        }
        // Wait until someone else sends and completes a sync.
    resume_2:
        if (!cur_sync->state)
        {
            wait_state = 2;
            return false;
        }
        flusher->syncing_flushers--;
        cur_sync->ready_count--;
        if (cur_sync->ready_count == 0)
        {
            flusher->syncs.erase(cur_sync);
        }
    }
    return true;
 }
 void journal_flusher_co::bitmap_set(void *bitmap, uint64_t start, uint64_t len)
 {
    if (start == 0)
    {
        if (len == 32*bs->bitmap_granularity)
        {
            *((uint32_t*)bitmap) = UINT32_MAX;
            return;
        }
        else if (len == 64*bs->bitmap_granularity)
        {
            *((uint64_t*)bitmap) = UINT64_MAX;
            return;
        }
    }
    unsigned bit_start = start / bs->bitmap_granularity;
    unsigned bit_end = ((start + len) + bs->bitmap_granularity - 1) / bs->bitmap_granularity;
    while (bit_start < bit_end)
    {
        if (!(bit_start & 7) && bit_end >= bit_start+8)
        {
            ((uint8_t*)bitmap)[bit_start / 8] = UINT8_MAX;
            bit_start += 8;
        }
        else
        {
            ((uint8_t*)bitmap)[bit_start / 8] |= 1 << (bit_start % 8);
            bit_start++;
        }
    }
 }
--- a/blockstore_flush.h
+++ b/blockstore_flush.h
@ -1,104 +0,0 @@
 struct copy_buffer_t
 {
    uint64_t offset, len;
    void *buf;
 };
 struct meta_sector_t
 {
    uint64_t offset, len;
    int state;
    void *buf;
    int usage_count;
 };
 struct flusher_sync_t
 {
    bool fsync_meta;
    int ready_count;
    int state;
 };
 struct flusher_meta_write_t
 {
    uint64_t sector, pos;
    bool submitted;
    void *buf;
    std::map<uint64_t, meta_sector_t>::iterator it;
 };
 class journal_flusher_t;
 // Journal flusher coroutine
 class journal_flusher_co
 {
    blockstore_impl_t *bs;
    journal_flusher_t *flusher;
    int wait_state, wait_count;
    struct io_uring_sqe *sqe;
    struct ring_data_t *data;
    std::list<flusher_sync_t>::iterator cur_sync;
    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_w;
    bool skip_copy, has_delete, has_writes;
    blockstore_clean_db_t::iterator clean_it;
    std::vector<copy_buffer_t> v;
    std::vector<copy_buffer_t>::iterator it;
    int copy_count;
    uint64_t clean_loc, old_clean_loc;
    flusher_meta_write_t meta_old, meta_new;
    bool clean_init_bitmap;
    uint64_t clean_bitmap_offset, clean_bitmap_len;
    void *new_clean_bitmap;
    // local: scan_dirty()
    uint64_t offset, end_offset, submit_offset, submit_len;
    friend class journal_flusher_t;
    bool scan_dirty(int wait_base);
    bool modify_meta_read(uint64_t meta_loc, flusher_meta_write_t &wr, int wait_base);
    void update_clean_db();
    bool fsync_batch(bool fsync_meta, int wait_base);
    void bitmap_set(void *bitmap, uint64_t start, uint64_t len);
 public:
    journal_flusher_co();
    bool loop();
 };
 // Journal flusher itself
 class journal_flusher_t
 {
    int trim_wanted = 0;
    bool dequeuing;
    int flusher_count;
    int flusher_start_threshold;
    journal_flusher_co *co;
    blockstore_impl_t *bs;
    friend class journal_flusher_co;
    int journal_trim_counter, journal_trim_interval;
    void* journal_superblock;
    int active_flushers;
    int syncing_flushers;
    std::list<flusher_sync_t> syncs;
    std::map<object_id, uint64_t> sync_to_repeat;
    std::map<uint64_t, meta_sector_t> meta_sectors;
    std::deque<object_id> flush_queue;
    std::map<object_id, uint64_t> flush_versions;
 public:
    journal_flusher_t(int flusher_count, blockstore_impl_t *bs);
    ~journal_flusher_t();
    void loop();
    bool is_active();
    void request_trim();
    void release_trim();
    void enqueue_flush(obj_ver_id oid);
    void unshift_flush(obj_ver_id oid);
 };
--- a/blockstore_impl.cpp
+++ b/blockstore_impl.cpp
@ -1,571 +0,0 @@
 #include "blockstore_impl.h"
 blockstore_impl_t::blockstore_impl_t(blockstore_config_t & config, ring_loop_t *ringloop)
 {
    assert(sizeof(blockstore_op_private_t) <= BS_OP_PRIVATE_DATA_SIZE);
    this->ringloop = ringloop;
    ring_consumer.loop = [this]() { loop(); };
    ringloop->register_consumer(&ring_consumer);
    initialized = 0;
    zero_object = (uint8_t*)memalign(MEM_ALIGNMENT, block_size);
    data_fd = meta_fd = journal.fd = -1;
    parse_config(config);
    try
    {
        open_data();
        open_meta();
        open_journal();
        calc_lengths();
        data_alloc = new allocator(block_count);
    }
    catch (std::exception & e)
    {
        if (data_fd >= 0)
            close(data_fd);
        if (meta_fd >= 0 && meta_fd != data_fd)
            close(meta_fd);
        if (journal.fd >= 0 && journal.fd != meta_fd)
            close(journal.fd);
        throw;
    }
    flusher = new journal_flusher_t(flusher_count, this);
 }
 blockstore_impl_t::~blockstore_impl_t()
 {
    delete data_alloc;
    delete flusher;
    free(zero_object);
    ringloop->unregister_consumer(&ring_consumer);
    if (data_fd >= 0)
        close(data_fd);
    if (meta_fd >= 0 && meta_fd != data_fd)
        close(meta_fd);
    if (journal.fd >= 0 && journal.fd != meta_fd)
        close(journal.fd);
    if (metadata_buffer)
        free(metadata_buffer);
    if (clean_bitmap)
        free(clean_bitmap);
 }
 bool blockstore_impl_t::is_started()
 {
    return initialized == 10;
 }
 bool blockstore_impl_t::is_stalled()
 {
    return queue_stall;
 }
 // main event loop - produce requests
 void blockstore_impl_t::loop()
 {
    // FIXME: initialized == 10 is ugly
    if (initialized != 10)
    {
        // read metadata, then journal
        if (initialized == 0)
        {
            metadata_init_reader = new blockstore_init_meta(this);
            initialized = 1;
        }
        if (initialized == 1)
        {
            int res = metadata_init_reader->loop();
            if (!res)
            {
                delete metadata_init_reader;
                metadata_init_reader = NULL;
                journal_init_reader = new blockstore_init_journal(this);
                initialized = 2;
            }
        }
        if (initialized == 2)
        {
            int res = journal_init_reader->loop();
            if (!res)
            {
                delete journal_init_reader;
                journal_init_reader = NULL;
                initialized = 10;
                ringloop->wakeup();
            }
        }
    }
    else
    {
        // try to submit ops
        unsigned initial_ring_space = ringloop->space_left();
        // FIXME: rework this "sync polling"
        auto cur_sync = in_progress_syncs.begin();
        while (cur_sync != in_progress_syncs.end())
        {
            if (continue_sync(*cur_sync) != 2)
            {
                // List is unmodified
                cur_sync++;
            }
            else
            {
                cur_sync = in_progress_syncs.begin();
            }
        }
        auto cur = submit_queue.begin();
        int has_writes = 0;
        while (cur != submit_queue.end())
        {
            auto op_ptr = cur;
            auto op = *(cur++);
            // FIXME: This needs some simplification
            // Writes should not block reads if the ring is not full and reads don't depend on them
            // In all other cases we should stop submission
            if (PRIV(op)->wait_for)
            {
                check_wait(op);
                if (PRIV(op)->wait_for == WAIT_SQE)
                {
                    break;
                }
                else if (PRIV(op)->wait_for)
                {
                    if (op->opcode == BS_OP_WRITE || op->opcode == BS_OP_DELETE)
                    {
                        has_writes = 2;
                    }
                    continue;
                }
            }
            unsigned ring_space = ringloop->space_left();
            unsigned prev_sqe_pos = ringloop->save();
            bool dequeue_op = false;
            if (op->opcode == BS_OP_READ)
            {
                dequeue_op = dequeue_read(op);
            }
            else if (op->opcode == BS_OP_WRITE)
            {
                if (has_writes == 2)
                {
                    // Some writes could not be submitted
                    break;
                }
                dequeue_op = dequeue_write(op);
                has_writes = dequeue_op ? 1 : 2;
            }
            else if (op->opcode == BS_OP_DELETE)
            {
                if (has_writes == 2)
                {
                    // Some writes could not be submitted
                    break;
                }
                dequeue_op = dequeue_del(op);
                has_writes = dequeue_op ? 1 : 2;
            }
            else if (op->opcode == BS_OP_SYNC)
            {
                // wait for all small writes to be submitted
                // wait for all big writes to complete, submit data device fsync
                // wait for the data device fsync to complete, then submit journal writes for big writes
                // then submit an fsync operation
                if (has_writes)
                {
                    // Can't submit SYNC before previous writes
                    continue;
                }
                dequeue_op = dequeue_sync(op);
            }
            else if (op->opcode == BS_OP_STABLE)
            {
                if (has_writes == 2)
                {
                    // Don't submit additional flushes before completing previous LISTs
                    break;
                }
                dequeue_op = dequeue_stable(op);
            }
            else if (op->opcode == BS_OP_ROLLBACK)
            {
                if (has_writes == 2)
                {
                    // Don't submit additional flushes before completing previous LISTs
                    break;
                }
                dequeue_op = dequeue_rollback(op);
            }
            else if (op->opcode == BS_OP_LIST)
            {
                // Block LIST operation by previous modifications,
                // so it always returns a consistent state snapshot
                if (has_writes == 2 || inflight_writes > 0)
                    has_writes = 2;
                else
                {
                    process_list(op);
                    dequeue_op = true;
                }
            }
            if (dequeue_op)
            {
                submit_queue.erase(op_ptr);
            }
            else
            {
                ringloop->restore(prev_sqe_pos);
                if (PRIV(op)->wait_for == WAIT_SQE)
                {
                    PRIV(op)->wait_detail = 1 + ring_space;
                    // ring is full, stop submission
                    break;
                }
            }
        }
        if (!readonly)
        {
            flusher->loop();
        }
        int ret = ringloop->submit();
        if (ret < 0)
        {
            throw std::runtime_error(std::string("io_uring_submit: ") + strerror(-ret));
        }
        if ((initial_ring_space - ringloop->space_left()) > 0)
        {
            live = true;
        }
        queue_stall = !live && !ringloop->has_work();
        live = false;
    }
 }
 bool blockstore_impl_t::is_safe_to_stop()
 {
    // It's safe to stop blockstore when there are no in-flight operations,
    // no in-progress syncs and flusher isn't doing anything
    if (submit_queue.size() > 0 || in_progress_syncs.size() > 0 || !readonly && flusher->is_active())
    {
        return false;
    }
    if (unsynced_big_writes.size() > 0 || unsynced_small_writes.size() > 0)
    {
        if (!readonly && !stop_sync_submitted)
        {
            // We should sync the blockstore before unmounting
            blockstore_op_t *op = new blockstore_op_t;
            op->opcode = BS_OP_SYNC;
            op->buf = NULL;
            op->callback = [](blockstore_op_t *op)
            {
                delete op;
            };
            enqueue_op(op);
            stop_sync_submitted = true;
        }
        return false;
    }
    return true;
 }
 void blockstore_impl_t::check_wait(blockstore_op_t *op)
 {
    if (PRIV(op)->wait_for == WAIT_SQE)
    {
        if (ringloop->space_left() < PRIV(op)->wait_detail)
        {
            // stop submission if there's still no free space
 #ifdef BLOCKSTORE_DEBUG
            printf("Still waiting for %lu SQE(s)\n", PRIV(op)->wait_detail);
 #endif
            return;
        }
        PRIV(op)->wait_for = 0;
    }
    else if (PRIV(op)->wait_for == WAIT_JOURNAL)
    {
        if (journal.used_start == PRIV(op)->wait_detail)
        {
            // do not submit
 #ifdef BLOCKSTORE_DEBUG
            printf("Still waiting to flush journal offset %08lx\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].usage_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() && !flusher->is_active())
        {
 #ifdef BLOCKSTORE_DEBUG
            printf("Still waiting for free space on the data device\n");
 #endif
            return;
        }
        PRIV(op)->wait_for = 0;
    }
    else
    {
        throw std::runtime_error("BUG: op->wait_for value is unexpected");
    }
 }
 void blockstore_impl_t::enqueue_op(blockstore_op_t *op, bool first)
 {
    if (op->opcode < BS_OP_MIN || op->opcode > BS_OP_MAX ||
        ((op->opcode == BS_OP_READ || op->opcode == BS_OP_WRITE) && (
            op->offset >= block_size ||
            op->len > block_size-op->offset ||
            (op->len % disk_alignment)
        )) ||
        readonly && op->opcode != BS_OP_READ && op->opcode != BS_OP_LIST ||
        first && op->opcode == BS_OP_WRITE)
    {
        // Basic verification not passed
        op->retval = -EINVAL;
        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 = [this, old_callback](blockstore_op_t *op)
                {
                    obj_ver_id *vers = (obj_ver_id*)op->buf;
                    delete[] vers;
                    op->buf = NULL;
                    (*old_callback)(op);
                    delete old_callback;
                };
                this->enqueue_op(op);
            }
            else
            {
                (*old_callback)(op);
                delete old_callback;
            }
        };
    }
    if ((op->opcode == BS_OP_WRITE || op->opcode == BS_OP_DELETE) && !enqueue_write(op))
    {
        std::function<void (blockstore_op_t*)>(op->callback)(op);
        return;
    }
    if (op->opcode == BS_OP_SYNC && immediate_commit == IMMEDIATE_ALL)
    {
        op->retval = 0;
        std::function<void (blockstore_op_t*)>(op->callback)(op);
        return;
    }
    // Call constructor without allocating memory. We'll call destructor before returning op back
    new ((void*)op->private_data) blockstore_op_private_t;
    PRIV(op)->wait_for = 0;
    PRIV(op)->op_state = 0;
    PRIV(op)->pending_ops = 0;
    if (!first)
    {
        submit_queue.push_back(op);
    }
    else
    {
        submit_queue.push_front(op);
    }
    ringloop->wakeup();
 }
 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;
 }
 void blockstore_impl_t::process_list(blockstore_op_t *op)
 {
    // Check PG
    uint32_t list_pg = op->offset;
    uint32_t pg_count = op->len;
    uint64_t pg_stripe_size = op->oid.stripe;
    if (pg_count != 0 && (pg_stripe_size < MIN_BLOCK_SIZE || list_pg >= pg_count))
    {
        op->retval = -EINVAL;
        FINISH_OP(op);
        return;
    }
    // Copy clean_db entries (sorted)
    int stable_count = 0, stable_alloc = clean_db.size() / (pg_count ? pg_count : 1);
    obj_ver_id *stable = (obj_ver_id*)malloc(sizeof(obj_ver_id) * stable_alloc);
    if (!stable)
    {
        op->retval = -ENOMEM;
        FINISH_OP(op);
        return;
    }
    for (auto it = clean_db.begin(); it != clean_db.end(); it++)
    {
        if (!pg_count || ((it->first.inode + it->first.stripe / pg_stripe_size) % pg_count) == list_pg)
        {
            if (stable_count >= stable_alloc)
            {
                stable_alloc += 32768;
                stable = (obj_ver_id*)realloc(stable, sizeof(obj_ver_id) * stable_alloc);
                if (!stable)
                {
                    op->retval = -ENOMEM;
                    FINISH_OP(op);
                    return;
                }
            }
            stable[stable_count++] = {
                .oid = it->first,
                .version = it->second.version,
            };
        }
    }
    int clean_stable_count = stable_count;
    // Copy dirty_db entries (sorted, too)
    int unstable_count = 0, unstable_alloc = 0;
    obj_ver_id *unstable = NULL;
    for (auto it = dirty_db.begin(); it != dirty_db.end(); it++)
    {
        if (!pg_count || ((it->first.oid.inode + it->first.oid.stripe / pg_stripe_size) % pg_count) == list_pg)
        {
            if (IS_DELETE(it->second.state))
            {
                // Deletions are always stable, so try to zero out two possible entries
                if (!replace_stable(it->first.oid, 0, 0, clean_stable_count, stable))
                {
                    replace_stable(it->first.oid, 0, clean_stable_count, stable_count, stable);
                }
            }
            else if (IS_STABLE(it->second.state))
            {
                // First try to replace a clean stable version in the first part of the list
                if (!replace_stable(it->first.oid, 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[stable_count-1].oid == it->first.oid)
                    {
                        stable[stable_count-1].version = it->first.version;
                    }
                    else
                    {
                        if (stable_count >= stable_alloc)
                        {
                            stable_alloc += 32768;
                            stable = (obj_ver_id*)realloc(stable, sizeof(obj_ver_id) * stable_alloc);
                            if (!stable)
                            {
                                if (unstable)
                                    free(unstable);
                                op->retval = -ENOMEM;
                                FINISH_OP(op);
                                return;
                            }
                        }
                        stable[stable_count++] = it->first;
                    }
                }
            }
            else
            {
                if (unstable_count >= unstable_alloc)
                {
                    unstable_alloc += 32768;
                    unstable = (obj_ver_id*)realloc(unstable, sizeof(obj_ver_id) * unstable_alloc);
                    if (!unstable)
                    {
                        if (stable)
                            free(stable);
                        op->retval = -ENOMEM;
                        FINISH_OP(op);
                        return;
                    }
                }
                unstable[unstable_count++] = 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;
        stable = (obj_ver_id*)realloc(stable, sizeof(obj_ver_id) * stable_alloc);
        if (!stable)
        {
            if (unstable)
                free(unstable);
            op->retval = -ENOMEM;
            FINISH_OP(op);
            return;
        }
    }
    // 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;
    FINISH_OP(op);
 }
--- a/blockstore_impl.h
+++ b/blockstore_impl.h
@ -1,333 +0,0 @@
 #pragma once
 #include "blockstore.h"
 #include <sys/types.h>
 #include <sys/ioctl.h>
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <malloc.h>
 #include <linux/fs.h>
 #include <vector>
 #include <list>
 #include <deque>
 #include <new>
 #include "cpp-btree/btree_map.h"
 #include "allocator.h"
 //#define BLOCKSTORE_DEBUG
 // States are not stored on disk. Instead, they're deduced from the journal
 // FIXME: Rename to BS_ST_*
 #define ST_J_WAIT_BIG 1
 #define ST_J_IN_FLIGHT 2
 #define ST_J_SUBMITTED 3
 #define ST_J_WRITTEN 4
 #define ST_J_SYNCED 5
 #define ST_J_STABLE 6
 #define ST_D_IN_FLIGHT 15
 #define ST_D_SUBMITTED 16
 #define ST_D_WRITTEN 17
 #define ST_D_SYNCED 20
 #define ST_D_STABLE 21
 #define ST_DEL_IN_FLIGHT 31
 #define ST_DEL_SUBMITTED 32
 #define ST_DEL_WRITTEN 33
 #define ST_DEL_SYNCED 34
 #define ST_DEL_STABLE 35
 #define ST_CURRENT 48
 #define IMMEDIATE_NONE 0
 #define IMMEDIATE_SMALL 1
 #define IMMEDIATE_ALL 2
 #define IS_IN_FLIGHT(st) (st == ST_J_WAIT_BIG || st == ST_J_IN_FLIGHT || st == ST_D_IN_FLIGHT || st == ST_DEL_IN_FLIGHT || st == ST_J_SUBMITTED || st == ST_D_SUBMITTED || st == ST_DEL_SUBMITTED)
 #define IS_STABLE(st) (st == ST_J_STABLE || st == ST_D_STABLE || st == ST_DEL_STABLE || st == ST_CURRENT)
 #define IS_SYNCED(st) (IS_STABLE(st) || st == ST_J_SYNCED || st == ST_D_SYNCED || st == ST_DEL_SYNCED)
 #define IS_JOURNAL(st) (st >= ST_J_WAIT_BIG && st <= ST_J_STABLE)
 #define IS_BIG_WRITE(st) (st >= ST_D_IN_FLIGHT && st <= ST_D_STABLE)
 #define IS_DELETE(st) (st >= ST_DEL_IN_FLIGHT && st <= ST_DEL_STABLE)
 #define IS_UNSYNCED(st) (st >= ST_J_WAIT_BIG && st <= ST_J_WRITTEN || st >= ST_D_IN_FLIGHT && st <= ST_D_WRITTEN|| st >= ST_DEL_IN_FLIGHT && st <= ST_DEL_WRITTEN)
 #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_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_for = WAIT_SQE;\
        return 0;\
    }
 #include "blockstore_journal.h"
 // 24 bytes + block bitmap per "clean" entry on disk with fixed metadata tables
 // FIXME: maybe add crc32's to metadata
 struct __attribute__((__packed__)) clean_disk_entry
 {
    object_id oid;
    uint64_t version;
    uint8_t bitmap[];
 };
 // 32 = 16 + 16 bytes per "clean" entry in memory (object_id => clean_entry)
 struct __attribute__((__packed__)) clean_entry
 {
    uint64_t version;
    uint64_t location;
 };
 // 56 = 24 + 32 bytes per dirty entry in memory (obj_ver_id => dirty_entry)
 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
 };
 // - 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
 // - 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
 // - 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 fulfill_read_t
 {
    uint64_t offset, len;
 };
 #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;
    int pending_ops;
    int op_state;
    // Read
    std::vector<fulfill_read_t> read_vec;
    // Sync, write
    uint64_t min_flushed_journal_sector, max_flushed_journal_sector;
    // Write
    struct iovec iov_zerofill[3];
    // Sync
    std::vector<obj_ver_id> sync_big_writes, sync_small_writes;
    int sync_small_checked, sync_big_checked;
    std::list<blockstore_op_t*>::iterator in_progress_ptr;
    int prev_sync_count;
 };
 // https://github.com/algorithm-ninja/cpp-btree
 // https://github.com/greg7mdp/sparsepp/ was used previously, but it was TERRIBLY slow after resizing
 // with sparsepp, random reads dropped to ~700 iops very fast with just as much as ~32k objects in the DB
 typedef btree::btree_map<object_id, clean_entry> blockstore_clean_db_t;
 typedef std::map<obj_ver_id, dirty_entry> blockstore_dirty_db_t;
 #include "blockstore_init.h"
 #include "blockstore_flush.h"
 class blockstore_impl_t
 {
    /******* OPTIONS *******/
    std::string data_device, meta_device, journal_device;
    uint32_t block_size;
    uint64_t meta_offset;
    uint64_t data_offset;
    uint64_t cfg_journal_size, cfg_data_size;
    // 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;
    // Metadata block size - minimum_io_size of the metadata device is the best choice
    uint64_t meta_block_size = 4096;
    // Sparse write tracking granularity. 4 KB is a good choice. Must be a multiple of disk_alignment
    uint64_t bitmap_granularity = 4096;
    bool readonly = false;
    // By default, Blockstore locks all opened devices exclusively. This option can be used to disable locking
    bool disable_flock = false;
    // It is safe to disable fsync() if drive write cache is writethrough
    bool disable_data_fsync = false, disable_meta_fsync = false, disable_journal_fsync = false;
    // Enable if you want every operation to be executed with an "implicit fsync"
    // Suitable only for server SSDs with capacitors, requires disabled data and journal fsyncs
    int immediate_commit = IMMEDIATE_NONE;
    bool inmemory_meta = false;
    int flusher_count;
    /******* END OF OPTIONS *******/
    struct ring_consumer_t ring_consumer;
    blockstore_clean_db_t clean_db;
    uint8_t *clean_bitmap = NULL;
    blockstore_dirty_db_t dirty_db;
    std::list<blockstore_op_t*> submit_queue; // FIXME: funny thing is that vector is better here
    std::vector<obj_ver_id> unsynced_big_writes, unsynced_small_writes;
    std::list<blockstore_op_t*> in_progress_syncs; // ...and probably here, too
    allocator *data_alloc = NULL;
    uint8_t *zero_object;
    uint32_t block_order;
    uint64_t block_count;
    uint32_t clean_entry_bitmap_size = 0, clean_entry_size = 0;
    int meta_fd;
    int data_fd;
    uint64_t meta_size, meta_area, meta_len;
    uint64_t data_size, data_len;
    void *metadata_buffer = NULL;
    struct journal_t journal;
    journal_flusher_t *flusher;
    bool live = false, queue_stall = false;
    ring_loop_t *ringloop;
    int inflight_writes = 0;
    bool stop_sync_submitted;
    inline struct io_uring_sqe* get_sqe()
    {
        return ringloop->get_sqe();
    }
    friend class blockstore_init_meta;
    friend class blockstore_init_journal;
    friend class blockstore_journal_check_t;
    friend class journal_flusher_t;
    friend class journal_flusher_co;
    void parse_config(blockstore_config_t & config);
    void calc_lengths();
    void open_data();
    void open_meta();
    void open_journal();
    // Asynchronous init
    int initialized;
    int metadata_buf_size;
    blockstore_init_meta* metadata_init_reader;
    blockstore_init_journal* journal_init_reader;
    void check_wait(blockstore_op_t *op);
    // Read
    int dequeue_read(blockstore_op_t *read_op);
    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);
    int fulfill_read_push(blockstore_op_t *op, void *buf, uint64_t offset, uint64_t len,
        uint32_t item_state, uint64_t item_version);
    void handle_read_event(ring_data_t *data, blockstore_op_t *op);
    // Write
    bool enqueue_write(blockstore_op_t *op);
    int dequeue_write(blockstore_op_t *op);
    int dequeue_del(blockstore_op_t *op);
    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 dequeue_sync(blockstore_op_t *op);
    void handle_sync_event(ring_data_t *data, blockstore_op_t *op);
    int continue_sync(blockstore_op_t *op);
    void ack_one_sync(blockstore_op_t *op);
    int ack_sync(blockstore_op_t *op);
    // Stabilize
    int dequeue_stable(blockstore_op_t *op);
    int continue_stable(blockstore_op_t *op);
    void mark_stable(const obj_ver_id & ov);
    void handle_stable_event(ring_data_t *data, blockstore_op_t *op);
    void stabilize_object(object_id oid, uint64_t max_ver);
    // Rollback
    int dequeue_rollback(blockstore_op_t *op);
    int continue_rollback(blockstore_op_t *op);
    void mark_rolled_back(const obj_ver_id & ov);
    void handle_rollback_event(ring_data_t *data, blockstore_op_t *op);
    void erase_dirty(blockstore_dirty_db_t::iterator dirty_start, blockstore_dirty_db_t::iterator dirty_end, uint64_t clean_loc);
    // List
    void process_list(blockstore_op_t *op);
 public:
    blockstore_impl_t(blockstore_config_t & config, ring_loop_t *ringloop);
    ~blockstore_impl_t();
    // Event loop
    void loop();
    // Returns true when blockstore is ready to process operations
    // (Although you're free to enqueue them before that)
    bool is_started();
    // 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();
    // Returns true if stalled
    bool is_stalled();
    // Submission
    void enqueue_op(blockstore_op_t *op, bool first = false);
    // Unstable writes are added here (map of object_id -> version)
    std::unordered_map<object_id, uint64_t> unstable_writes;
    inline uint32_t get_block_size() { return block_size; }
    inline uint64_t get_block_count() { return block_count; }
    inline uint64_t get_free_block_count() { return data_alloc->get_free_count(); }
    inline uint32_t get_disk_alignment() { return disk_alignment; }
 };
--- a/blockstore_init.cpp
+++ b/blockstore_init.cpp
@ -1,640 +0,0 @@
 #include "blockstore_impl.h"
 blockstore_init_meta::blockstore_init_meta(blockstore_impl_t *bs)
 {
    this->bs = bs;
 }
 void blockstore_init_meta::handle_event(ring_data_t *data)
 {
    if (data->res <= 0)
    {
        throw std::runtime_error(
            std::string("read metadata failed at offset ") + std::to_string(metadata_read) +
            std::string(": ") + strerror(-data->res)
        );
    }
    prev_done = data->res > 0 ? submitted : 0;
    done_len = data->res;
    done_pos = metadata_read;
    metadata_read += data->res;
    submitted = 0;
 }
 int blockstore_init_meta::loop()
 {
    if (wait_state == 1)
        goto resume_1;
    printf("Reading blockstore metadata\n");
    if (bs->inmemory_meta)
        metadata_buffer = bs->metadata_buffer;
    else
        metadata_buffer = memalign(MEM_ALIGNMENT, 2*bs->metadata_buf_size);
    if (!metadata_buffer)
        throw std::runtime_error("Failed to allocate metadata read buffer");
    while (1)
    {
    resume_1:
        if (submitted)
        {
            wait_state = 1;
            return 1;
        }
        if (metadata_read < bs->meta_len)
        {
            sqe = bs->get_sqe();
            if (!sqe)
            {
                throw std::runtime_error("io_uring is full while trying to read metadata");
            }
            data = ((ring_data_t*)sqe->user_data);
            data->iov = {
                metadata_buffer + (bs->inmemory_meta
                    ? metadata_read
                    : (prev == 1 ? bs->metadata_buf_size : 0)),
                bs->meta_len - metadata_read > bs->metadata_buf_size ? bs->metadata_buf_size : bs->meta_len - metadata_read,
            };
            data->callback = [this](ring_data_t *data) { handle_event(data); };
            my_uring_prep_readv(sqe, bs->meta_fd, &data->iov, 1, bs->meta_offset + metadata_read);
            bs->ringloop->submit();
            submitted = (prev == 1 ? 2 : 1);
            prev = submitted;
        }
        if (prev_done)
        {
            void *done_buf = bs->inmemory_meta
                ? (metadata_buffer + done_pos)
                : (metadata_buffer + (prev_done == 2 ? bs->metadata_buf_size : 0));
            unsigned count = bs->meta_block_size / bs->clean_entry_size;
            for (int sector = 0; sector < done_len; sector += bs->meta_block_size)
            {
                // handle <count> entries
                handle_entries(done_buf + sector, count, bs->block_order);
                done_cnt += count;
            }
            prev_done = 0;
            done_len = 0;
        }
        if (!submitted)
        {
            break;
        }
    }
    // metadata read finished
    printf("Metadata entries loaded: %lu, free blocks: %lu / %lu\n", entries_loaded, bs->data_alloc->get_free_count(), bs->block_count);
    if (!bs->inmemory_meta)
    {
        free(metadata_buffer);
        metadata_buffer = NULL;
    }
    return 0;
 }
 void blockstore_init_meta::handle_entries(void* entries, unsigned count, int block_order)
 {
    for (unsigned i = 0; i < count; i++)
    {
        clean_disk_entry *entry = (clean_disk_entry*)(entries + i*bs->clean_entry_size);
        if (!bs->inmemory_meta && bs->clean_entry_bitmap_size)
        {
            memcpy(bs->clean_bitmap + (done_cnt+i)*bs->clean_entry_bitmap_size, &entry->bitmap, bs->clean_entry_bitmap_size);
        }
        if (entry->oid.inode > 0)
        {
            auto clean_it = bs->clean_db.find(entry->oid);
            if (clean_it == bs->clean_db.end() || clean_it->second.version < entry->version)
            {
                if (clean_it != bs->clean_db.end())
                {
                    // free the previous block
 #ifdef BLOCKSTORE_DEBUG
                    printf("Free block %lu\n", clean_it->second.location >> bs->block_order);
 #endif
                    bs->data_alloc->set(clean_it->second.location >> block_order, false);
                }
                entries_loaded++;
 #ifdef BLOCKSTORE_DEBUG
                printf("Allocate block (clean entry) %lu: %lu:%lu v%lu\n", done_cnt+i, entry->oid.inode, entry->oid.stripe, entry->version);
 #endif
                bs->data_alloc->set(done_cnt+i, true);
                bs->clean_db[entry->oid] = (struct clean_entry){
                    .version = entry->version,
                    .location = (done_cnt+i) << block_order,
                };
            }
            else
            {
 #ifdef BLOCKSTORE_DEBUG
                printf("Old clean entry %lu: %lu:%lu v%lu\n", done_cnt+i, entry->oid.inode, entry->oid.stripe, entry->version);
 #endif
            }
        }
    }
 }
 blockstore_init_journal::blockstore_init_journal(blockstore_impl_t *bs)
 {
    this->bs = bs;
    next_free = bs->journal.block_size;
    simple_callback = [this](ring_data_t *data1)
    {
        if (data1->res != data1->iov.iov_len)
        {
            throw std::runtime_error(std::string("I/O operation failed while reading journal: ") + strerror(-data1->res));
        }
        wait_count--;
    };
 }
 bool iszero(uint64_t *buf, int len)
 {
    for (int i = 0; i < len; i++)
        if (buf[i] != 0)
            return false;
    return true;
 }
 void blockstore_init_journal::handle_event(ring_data_t *data1)
 {
    if (data1->res <= 0)
    {
        throw std::runtime_error(
            std::string("read journal failed at offset ") + std::to_string(journal_pos) +
            std::string(": ") + strerror(-data1->res)
        );
    }
    done.push_back({
        .buf = submitted_buf,
        .pos = journal_pos,
        .len = (uint64_t)data1->res,
    });
    journal_pos += data1->res;
    if (journal_pos >= bs->journal.len)
    {
        // Continue from the beginning
        journal_pos = bs->journal.block_size;
        wrapped = true;
    }
    submitted_buf = NULL;
 }
 #define GET_SQE() \
    sqe = bs->get_sqe();\
    if (!sqe)\
        throw std::runtime_error("io_uring is full while trying to read journal");\
    data = ((ring_data_t*)sqe->user_data)
 int blockstore_init_journal::loop()
 {
    if (wait_state == 1)
        goto resume_1;
    else if (wait_state == 2)
        goto resume_2;
    else if (wait_state == 3)
        goto resume_3;
    else if (wait_state == 4)
        goto resume_4;
    else if (wait_state == 5)
        goto resume_5;
    else if (wait_state == 6)
        goto resume_6;
    else if (wait_state == 7)
        goto resume_7;
    printf("Reading blockstore journal\n");
    if (!bs->journal.inmemory)
    {
        submitted_buf = memalign(MEM_ALIGNMENT, 2*bs->journal.block_size);
        if (!submitted_buf)
            throw std::bad_alloc();
    }
    else
        submitted_buf = bs->journal.buffer;
    // Read first block of the journal
    sqe = bs->get_sqe();
    if (!sqe)
        throw std::runtime_error("io_uring is full while trying to read journal");
    data = ((ring_data_t*)sqe->user_data);
    data->iov = { submitted_buf, bs->journal.block_size };
    data->callback = simple_callback;
    my_uring_prep_readv(sqe, bs->journal.fd, &data->iov, 1, bs->journal.offset);
    bs->ringloop->submit();
    wait_count = 1;
 resume_1:
    if (wait_count > 0)
    {
        wait_state = 1;
        return 1;
    }
    if (iszero((uint64_t*)submitted_buf, 3))
    {
        // Journal is empty
        // FIXME handle this wrapping to journal_block_size better (maybe)
        bs->journal.used_start = bs->journal.block_size;
        bs->journal.next_free = bs->journal.block_size;
        // Initialize journal "superblock" and the first block
        memset(submitted_buf, 0, 2*bs->journal.block_size);
        *((journal_entry_start*)submitted_buf) = {
            .crc32 = 0,
            .magic = JOURNAL_MAGIC,
            .type = JE_START,
            .size = sizeof(journal_entry_start),
            .reserved = 0,
            .journal_start = bs->journal.block_size,
        };
        ((journal_entry_start*)submitted_buf)->crc32 = je_crc32((journal_entry*)submitted_buf);
        if (bs->readonly)
        {
            printf("Skipping journal initialization because blockstore is readonly\n");
        }
        else
        {
            // Cool effect. Same operations result in journal replay.
            // FIXME: Randomize initial crc32. Track crc32 when trimming.
            printf("Resetting journal\n");
            GET_SQE();
            data->iov = (struct iovec){ submitted_buf, 2*bs->journal.block_size };
            data->callback = simple_callback;
            my_uring_prep_writev(sqe, bs->journal.fd, &data->iov, 1, bs->journal.offset);
            wait_count++;
            bs->ringloop->submit();
        resume_6:
            if (wait_count > 0)
            {
                wait_state = 6;
                return 1;
            }
            if (!bs->disable_journal_fsync)
            {
                GET_SQE();
                my_uring_prep_fsync(sqe, bs->journal.fd, IORING_FSYNC_DATASYNC);
                data->iov = { 0 };
                data->callback = simple_callback;
                wait_count++;
                bs->ringloop->submit();
            }
        resume_4:
            if (wait_count > 0)
            {
                wait_state = 4;
                return 1;
            }
        }
        if (!bs->journal.inmemory)
        {
            free(submitted_buf);
        }
    }
    else
    {
        // First block always contains a single JE_START entry
        je_start = (journal_entry_start*)submitted_buf;
        if (je_start->magic != JOURNAL_MAGIC ||
            je_start->type != JE_START ||
            je_start->size != sizeof(journal_entry_start) ||
            je_crc32((journal_entry*)je_start) != je_start->crc32)
        {
            // Entry is corrupt
            throw std::runtime_error("first entry of the journal is corrupt");
        }
        next_free = journal_pos = bs->journal.used_start = je_start->journal_start;
        if (!bs->journal.inmemory)
            free(submitted_buf);
        submitted_buf = NULL;
        crc32_last = 0;
        // Read journal
        while (1)
        {
        resume_2:
            if (submitted_buf)
            {
                wait_state = 2;
                return 1;
            }
            if (!wrapped || journal_pos < bs->journal.used_start)
            {
                GET_SQE();
                uint64_t end = bs->journal.len;
                if (journal_pos < bs->journal.used_start)
                    end = bs->journal.used_start;
                if (!bs->journal.inmemory)
                    submitted_buf = memalign(MEM_ALIGNMENT, JOURNAL_BUFFER_SIZE);
                else
                    submitted_buf = bs->journal.buffer + journal_pos;
                data->iov = {
                    submitted_buf,
                    end - journal_pos < JOURNAL_BUFFER_SIZE ? end - journal_pos : JOURNAL_BUFFER_SIZE,
                };
                data->callback = [this](ring_data_t *data1) { handle_event(data1); };
                my_uring_prep_readv(sqe, bs->journal.fd, &data->iov, 1, bs->journal.offset + journal_pos);
                bs->ringloop->submit();
            }
            while (done.size() > 0)
            {
                handle_res = handle_journal_part(done[0].buf, done[0].pos, done[0].len);
                if (handle_res == 0)
                {
                    // journal ended
                    // zero out corrupted entry, if required
                    if (init_write_buf && !bs->readonly)
                    {
                        GET_SQE();
                        data->iov = { init_write_buf, bs->journal.block_size };
                        data->callback = simple_callback;
                        my_uring_prep_writev(sqe, bs->journal.fd, &data->iov, 1, bs->journal.offset + init_write_sector);
                        wait_count++;
                        bs->ringloop->submit();
                    resume_7:
                        if (wait_count > 0)
                        {
                            wait_state = 7;
                            return 1;
                        }
                        if (!bs->disable_journal_fsync)
                        {
                            GET_SQE();
                            data->iov = { 0 };
                            data->callback = simple_callback;
                            my_uring_prep_fsync(sqe, bs->journal.fd, IORING_FSYNC_DATASYNC);
                            wait_count++;
                            bs->ringloop->submit();
                        }
                    resume_5:
                        if (wait_count > 0)
                        {
                            wait_state = 5;
                            return 1;
                        }
                    }
                    // wait for the next read to complete, then stop
                resume_3:
                    if (submitted_buf)
                    {
                        wait_state = 3;
                        return 1;
                    }
                    // free buffers
                    if (!bs->journal.inmemory)
                        for (auto & e: done)
                            free(e.buf);
                    done.clear();
                    break;
                }
                else if (handle_res == 1)
                {
                    // OK, remove it
                    if (!bs->journal.inmemory)
                    {
                        free(done[0].buf);
                    }
                    done.erase(done.begin());
                }
                else if (handle_res == 2)
                {
                    // Need to wait for more reads
                    break;
                }
            }
            if (!submitted_buf)
            {
                break;
            }
        }
    }
    // Trim journal on start so we don't stall when all entries are older
    bs->journal.trim();
    bs->journal.dirty_start = bs->journal.next_free;
    printf(
        "Journal entries loaded: %lu, free journal space: %lu bytes (%08lx..%08lx is used), free blocks: %lu / %lu\n",
        entries_loaded,
        (bs->journal.next_free >= bs->journal.used_start
            ? bs->journal.len-bs->journal.block_size - (bs->journal.next_free-bs->journal.used_start)
            : bs->journal.used_start - bs->journal.next_free),
        bs->journal.used_start, bs->journal.next_free,
        bs->data_alloc->get_free_count(), bs->block_count
    );
    bs->journal.crc32_last = crc32_last;
    return 0;
 }
 int blockstore_init_journal::handle_journal_part(void *buf, uint64_t done_pos, uint64_t len)
 {
    uint64_t proc_pos, pos;
    if (continue_pos != 0)
    {
        proc_pos = (continue_pos / bs->journal.block_size) * bs->journal.block_size;
        pos = continue_pos % bs->journal.block_size;
        continue_pos = 0;
        goto resume;
    }
    while (next_free >= done_pos && next_free < done_pos+len)
    {
        proc_pos = next_free;
        pos = 0;
        next_free += bs->journal.block_size;
        if (next_free >= bs->journal.len)
        {
            next_free = bs->journal.block_size;
        }
    resume:
        while (pos < bs->journal.block_size)
        {
            journal_entry *je = (journal_entry*)(buf + proc_pos - done_pos + pos);
            if (je->magic != JOURNAL_MAGIC || je_crc32(je) != je->crc32 ||
                je->type < JE_MIN || je->type > JE_MAX || started && je->crc32_prev != crc32_last)
            {
                if (pos == 0)
                {
                    // invalid entry in the beginning, this is definitely the end of the journal
                    bs->journal.next_free = proc_pos;
                    return 0;
                }
                else
                {
                    // allow partially filled sectors
                    break;
                }
            }
            if (je->type == JE_SMALL_WRITE)
            {
 #ifdef BLOCKSTORE_DEBUG
                printf("je_small_write oid=%lu:%lu ver=%lu offset=%u len=%u\n", je->small_write.oid.inode, je->small_write.oid.stripe, je->small_write.version, je->small_write.offset, je->small_write.len);
 #endif
                // oid, version, offset, len
                uint64_t prev_free = next_free;
                if (next_free + je->small_write.len > bs->journal.len)
                {
                    // data continues from the beginning of the journal
                    next_free = bs->journal.block_size;
                }
                uint64_t location = next_free;
                next_free += je->small_write.len;
                if (next_free >= bs->journal.len)
                {
                    next_free = bs->journal.block_size;
                }
                if (location != je->small_write.data_offset)
                {
                    char err[1024];
                    snprintf(err, 1024, "BUG: calculated journal data offset (%08lx) != stored journal data offset (%08lx)", location, je->small_write.data_offset);
                    throw std::runtime_error(err);
                }
                uint32_t data_crc32 = 0;
                if (location >= done_pos && location+je->small_write.len <= done_pos+len)
                {
                    // data is within this buffer
                    data_crc32 = crc32c(0, buf + location - done_pos, je->small_write.len);
                }
                else
                {
                    // this case is even more interesting because we must carry data crc32 check to next buffer(s)
                    uint64_t covered = 0;
                    for (int i = 0; i < done.size(); i++)
                    {
                        if (location+je->small_write.len > done[i].pos &&
                            location < done[i].pos+done[i].len)
                        {
                            uint64_t part_end = (location+je->small_write.len < done[i].pos+done[i].len
                                ? location+je->small_write.len : done[i].pos+done[i].len);
                            uint64_t part_begin = (location < done[i].pos ? done[i].pos : location);
                            covered += part_end - part_begin;
                            data_crc32 = crc32c(data_crc32, done[i].buf + part_begin - done[i].pos, part_end - part_begin);
                        }
                    }
                    if (covered < je->small_write.len)
                    {
                        continue_pos = proc_pos+pos;
                        next_free = prev_free;
                        return 2;
                    }
                }
                if (data_crc32 != je->small_write.crc32_data)
                {
                    // journal entry is corrupt, stop here
                    // interesting thing is that we must clear the corrupt entry if we're not readonly,
                    // because we don't write next entries in the same journal block
                    printf("Journal entry data is corrupt (data crc32 %x != %x)\n", data_crc32, je->small_write.crc32_data);
                    memset(buf + proc_pos - done_pos + pos, 0, bs->journal.block_size - pos);
                    bs->journal.next_free = prev_free;
                    init_write_buf = buf + proc_pos - done_pos;
                    init_write_sector = proc_pos;
                    return 0;
                }
                auto clean_it = bs->clean_db.find(je->small_write.oid);
                if (clean_it == bs->clean_db.end() ||
                    clean_it->second.version < je->small_write.version)
                {
                    obj_ver_id ov = {
                        .oid = je->small_write.oid,
                        .version = je->small_write.version,
                    };
                    bs->dirty_db.emplace(ov, (dirty_entry){
                        .state = ST_J_SYNCED,
                        .flags = 0,
                        .location = location,
                        .offset = je->small_write.offset,
                        .len = je->small_write.len,
                        .journal_sector = proc_pos,
                    });
                    bs->journal.used_sectors[proc_pos]++;
 #ifdef BLOCKSTORE_DEBUG
                    printf(
                        "journal offset %08lx is used by %lu:%lu v%lu (%lu refs)\n",
                        proc_pos, ov.oid.inode, ov.oid.stripe, ov.version, bs->journal.used_sectors[proc_pos]
                    );
 #endif
                    auto & unstab = bs->unstable_writes[ov.oid];
                    unstab = unstab < ov.version ? ov.version : unstab;
                }
            }
            else if (je->type == JE_BIG_WRITE)
            {
 #ifdef BLOCKSTORE_DEBUG
                printf("je_big_write oid=%lu:%lu ver=%lu loc=%lu\n", je->big_write.oid.inode, je->big_write.oid.stripe, je->big_write.version, je->big_write.location);
 #endif
                auto clean_it = bs->clean_db.find(je->big_write.oid);
                if (clean_it == bs->clean_db.end() ||
                    clean_it->second.version < je->big_write.version)
                {
                    // oid, version, block
                    obj_ver_id ov = {
                        .oid = je->big_write.oid,
                        .version = je->big_write.version,
                    };
                    bs->dirty_db.emplace(ov, (dirty_entry){
                        .state = ST_D_SYNCED,
                        .flags = 0,
                        .location = je->big_write.location,
                        .offset = je->big_write.offset,
                        .len = je->big_write.len,
                        .journal_sector = proc_pos,
                    });
 #ifdef BLOCKSTORE_DEBUG
                    printf("Allocate block %lu\n", je->big_write.location >> bs->block_order);
 #endif
                    bs->data_alloc->set(je->big_write.location >> bs->block_order, true);
                    bs->journal.used_sectors[proc_pos]++;
                    auto & unstab = bs->unstable_writes[ov.oid];
                    unstab = unstab < ov.version ? ov.version : unstab;
                }
            }
            else if (je->type == JE_STABLE)
            {
 #ifdef BLOCKSTORE_DEBUG
                printf("je_stable oid=%lu:%lu ver=%lu\n", je->stable.oid.inode, je->stable.oid.stripe, je->stable.version);
 #endif
                // oid, version
                obj_ver_id ov = {
                    .oid = je->stable.oid,
                    .version = je->stable.version,
                };
                bs->mark_stable(ov);
            }
            else if (je->type == JE_ROLLBACK)
            {
 #ifdef BLOCKSTORE_DEBUG
                printf("je_rollback oid=%lu:%lu ver=%lu\n", je->rollback.oid.inode, je->rollback.oid.stripe, je->rollback.version);
 #endif
                // rollback dirty writes of <oid> up to <version>
                obj_ver_id ov = {
                    .oid = je->rollback.oid,
                    .version = je->rollback.version,
                };
                bs->mark_rolled_back(ov);
            }
            else if (je->type == JE_DELETE)
            {
 #ifdef BLOCKSTORE_DEBUG
                printf("je_delete oid=%lu:%lu ver=%lu\n", je->del.oid.inode, je->del.oid.stripe, je->del.version);
 #endif
                auto clean_it = bs->clean_db.find(je->del.oid);
                if (clean_it == bs->clean_db.end() ||
                    clean_it->second.version < je->del.version)
                {
                    // oid, version
                    obj_ver_id ov = {
                        .oid = je->del.oid,
                        .version = je->del.version,
                    };
                    bs->dirty_db.emplace(ov, (dirty_entry){
                        .state = ST_DEL_SYNCED,
                        .flags = 0,
                        .location = 0,
                        .offset = 0,
                        .len = 0,
                        .journal_sector = proc_pos,
                    });
                    bs->journal.used_sectors[proc_pos]++;
                    // Deletions are treated as immediately stable, because
                    // "2-phase commit" (write->stabilize) isn't sufficient for them anyway
                    bs->mark_stable(ov);
                }
            }
            started = true;
            pos += je->size;
            crc32_last = je->crc32;
            entries_loaded++;
        }
    }
    bs->journal.next_free = next_free;
    return 1;
 }
--- a/blockstore_journal.cpp
+++ b/blockstore_journal.cpp
@ -1,218 +0,0 @@
 #include "blockstore_impl.h"
 blockstore_journal_check_t::blockstore_journal_check_t(blockstore_impl_t *bs)
 {
    this->bs = bs;
    sectors_required = 0;
    next_pos = bs->journal.next_free;
    next_sector = bs->journal.cur_sector;
    first_sector = -1;
    next_in_pos = bs->journal.in_sector_pos;
    right_dir = next_pos >= bs->journal.used_start;
 }
 // Check if we can write <required> entries of <size> bytes and <data_after> data bytes after them to the journal
 int blockstore_journal_check_t::check_available(blockstore_op_t *op, int entries_required, int size, int data_after)
 {
    int required = entries_required;
    while (1)
    {
        int fits = (bs->journal.block_size - next_in_pos) / size;
        if (fits > 0)
        {
            if (first_sector == -1)
            {
                first_sector = next_sector;
            }
            required -= fits;
            next_in_pos += fits * size;
            sectors_required++;
        }
        else if (bs->journal.sector_info[next_sector].dirty)
        {
            // sectors_required is more like "sectors to write"
            sectors_required++;
        }
        if (required <= 0)
        {
            break;
        }
        next_pos = next_pos + bs->journal.block_size;
        if (next_pos >= bs->journal.len)
        {
            next_pos = bs->journal.block_size;
            right_dir = false;
        }
        next_in_pos = 0;
        next_sector = ((next_sector + 1) % bs->journal.sector_count);
        if (next_sector == first_sector)
        {
            // next_sector may wrap when all sectors are flushed and the incoming batch is too big
            // This is an error condition, we can't wait for anything in this case
            throw std::runtime_error(
                "Blockstore journal_sector_buffer_count="+std::to_string(bs->journal.sector_count)+
                " is too small for a batch of "+std::to_string(entries_required)+" entries of "+std::to_string(size)+" bytes"
            );
        }
        if (bs->journal.sector_info[next_sector].usage_count > 0 ||
            bs->journal.sector_info[next_sector].dirty)
        {
            // No memory buffer available. Wait for it.
            int used = 0, dirty = 0;
            for (int i = 0; i < bs->journal.sector_count; i++)
            {
                if (bs->journal.sector_info[i].dirty)
                {
                    dirty++;
                    used++;
                }
                if (bs->journal.sector_info[i].usage_count > 0)
                {
                    used++;
                }
            }
            // In fact, it's even more rare than "ran out of journal space", so print a warning
            printf(
                "Ran out of journal sector buffers: %d/%lu buffers used (%d dirty), next buffer (%ld) is %s and flushed %lu times\n",
                used, bs->journal.sector_count, dirty, next_sector,
                bs->journal.sector_info[next_sector].dirty ? "dirty" : "not dirty",
                bs->journal.sector_info[next_sector].usage_count
            );
            PRIV(op)->wait_for = WAIT_JOURNAL_BUFFER;
            return 0;
        }
    }
    if (data_after > 0)
    {
        next_pos = next_pos + data_after;
        if (next_pos > bs->journal.len)
        {
            next_pos = bs->journal.block_size + data_after;
            right_dir = false;
        }
    }
    if (!right_dir && next_pos >= bs->journal.used_start-bs->journal.block_size)
    {
        // No space in the journal. Wait until used_start changes.
        printf(
            "Ran out of journal space (free space: %lu bytes)\n",
            (bs->journal.next_free >= bs->journal.used_start
                ? bs->journal.len-bs->journal.block_size - (bs->journal.next_free-bs->journal.used_start)
                : bs->journal.used_start - bs->journal.next_free)
        );
        PRIV(op)->wait_for = WAIT_JOURNAL;
        bs->flusher->request_trim();
        PRIV(op)->wait_detail = bs->journal.used_start;
        return 0;
    }
    return 1;
 }
 journal_entry* prefill_single_journal_entry(journal_t & journal, uint16_t type, uint32_t size)
 {
    if (journal.block_size - journal.in_sector_pos < size)
    {
        assert(!journal.sector_info[journal.cur_sector].dirty);
        // Move to the next journal sector
        if (journal.sector_info[journal.cur_sector].usage_count > 0)
        {
            // Also select next sector buffer in memory
            journal.cur_sector = ((journal.cur_sector + 1) % journal.sector_count);
            assert(!journal.sector_info[journal.cur_sector].usage_count);
        }
        else
        {
            journal.dirty_start = journal.next_free;
        }
        journal.sector_info[journal.cur_sector].offset = journal.next_free;
        journal.in_sector_pos = 0;
        journal.next_free = (journal.next_free+journal.block_size) < journal.len ? journal.next_free + journal.block_size : journal.block_size;
        memset(journal.inmemory
            ? journal.buffer + journal.sector_info[journal.cur_sector].offset
            : journal.sector_buf + journal.block_size*journal.cur_sector, 0, journal.block_size);
    }
    journal_entry *je = (struct journal_entry*)(
        (journal.inmemory
            ? journal.buffer + journal.sector_info[journal.cur_sector].offset
            : journal.sector_buf + journal.block_size*journal.cur_sector) + journal.in_sector_pos
    );
    journal.in_sector_pos += size;
    je->magic = JOURNAL_MAGIC;
    je->type = type;
    je->size = size;
    je->crc32_prev = journal.crc32_last;
    journal.sector_info[journal.cur_sector].dirty = true;
    return je;
 }
 void prepare_journal_sector_write(journal_t & journal, int cur_sector, io_uring_sqe *sqe, std::function<void(ring_data_t*)> cb)
 {
    journal.sector_info[cur_sector].dirty = false;
    journal.sector_info[cur_sector].usage_count++;
    ring_data_t *data = ((ring_data_t*)sqe->user_data);
    data->iov = (struct iovec){
        (journal.inmemory
            ? journal.buffer + journal.sector_info[cur_sector].offset
            : journal.sector_buf + journal.block_size*cur_sector),
        journal.block_size
    };
    data->callback = cb;
    my_uring_prep_writev(
        sqe, journal.fd, &data->iov, 1, journal.offset + journal.sector_info[cur_sector].offset
    );
 }
 journal_t::~journal_t()
 {
    if (sector_buf)
        free(sector_buf);
    if (sector_info)
        free(sector_info);
    if (buffer)
        free(buffer);
    sector_buf = NULL;
    sector_info = NULL;
    buffer = NULL;
 }
 bool journal_t::trim()
 {
    auto journal_used_it = used_sectors.lower_bound(used_start);
 #ifdef BLOCKSTORE_DEBUG
    printf(
        "Trimming journal (used_start=%08lx, next_free=%08lx, dirty_start=%08lx, new_start=%08lx, new_refcount=%ld)\n",
        used_start, next_free, dirty_start,
        journal_used_it == used_sectors.end() ? 0 : journal_used_it->first,
        journal_used_it == used_sectors.end() ? 0 : journal_used_it->second
    );
 #endif
    if (journal_used_it == used_sectors.end())
    {
        // Journal is cleared to its end, restart from the beginning
        journal_used_it = used_sectors.begin();
        if (journal_used_it == used_sectors.end())
        {
            // Journal is empty
            used_start = next_free;
        }
        else
        {
            used_start = journal_used_it->first;
            // next_free does not need updating here
        }
    }
    else if (journal_used_it->first > used_start)
    {
        // Journal is cleared up to <journal_used_it>
        used_start = journal_used_it->first;
    }
    else
    {
        // Can't trim journal
        return false;
    }
 #ifdef BLOCKSTORE_DEBUG
    printf("Journal trimmed to %08lx (next_free=%08lx)\n", used_start, next_free);
 #endif
    return true;
 }
--- a/blockstore_open.cpp
+++ b/blockstore_open.cpp
@ -1,366 +0,0 @@
 #include <sys/file.h>
 #include "blockstore_impl.h"
 static uint32_t is_power_of_two(uint64_t value)
 {
    uint32_t l = 0;
    while (value > 1)
    {
        if (value & 1)
        {
            return 64;
        }
        value = value >> 1;
        l++;
    }
    return l;
 }
 void blockstore_impl_t::parse_config(blockstore_config_t & config)
 {
    // Parse
    if (config["readonly"] == "true" || config["readonly"] == "1" || config["readonly"] == "yes")
    {
        readonly = true;
    }
    if (config["disable_data_fsync"] == "true" || config["disable_data_fsync"] == "1" || config["disable_data_fsync"] == "yes")
    {
        disable_data_fsync = true;
    }
    if (config["disable_meta_fsync"] == "true" || config["disable_meta_fsync"] == "1" || config["disable_meta_fsync"] == "yes")
    {
        disable_meta_fsync = true;
    }
    if (config["disable_journal_fsync"] == "true" || config["disable_journal_fsync"] == "1" || config["disable_journal_fsync"] == "yes")
    {
        disable_journal_fsync = true;
    }
    if (config["disable_device_lock"] == "true" || config["disable_device_lock"] == "1" || config["disable_device_lock"] == "yes")
    {
        disable_flock = true;
    }
    if (config["immediate_commit"] == "all")
    {
        immediate_commit = IMMEDIATE_ALL;
    }
    else if (config["immediate_commit"] == "small")
    {
        immediate_commit = IMMEDIATE_SMALL;
    }
    metadata_buf_size = strtoull(config["meta_buf_size"].c_str(), NULL, 10);
    cfg_journal_size = strtoull(config["journal_size"].c_str(), NULL, 10);
    data_device = config["data_device"];
    data_offset = strtoull(config["data_offset"].c_str(), NULL, 10);
    cfg_data_size = strtoull(config["data_size"].c_str(), NULL, 10);
    meta_device = config["meta_device"];
    meta_offset = strtoull(config["meta_offset"].c_str(), NULL, 10);
    block_size = strtoull(config["block_size"].c_str(), NULL, 10);
    inmemory_meta = config["inmemory_metadata"] != "false";
    journal_device = config["journal_device"];
    journal.offset = strtoull(config["journal_offset"].c_str(), NULL, 10);
    journal.sector_count = strtoull(config["journal_sector_buffer_count"].c_str(), NULL, 10);
    journal.inmemory = config["inmemory_journal"] != "false";
    disk_alignment = strtoull(config["disk_alignment"].c_str(), NULL, 10);
    journal_block_size = strtoull(config["journal_block_size"].c_str(), NULL, 10);
    meta_block_size = strtoull(config["meta_block_size"].c_str(), NULL, 10);
    bitmap_granularity = strtoull(config["bitmap_granularity"].c_str(), NULL, 10);
    flusher_count = strtoull(config["flusher_count"].c_str(), NULL, 10);
    // Validate
    if (!block_size)
    {
        block_size = (1 << DEFAULT_ORDER);
    }
    if ((block_order = is_power_of_two(block_size)) >= 64 || block_size < MIN_BLOCK_SIZE || block_size >= MAX_BLOCK_SIZE)
    {
        throw std::runtime_error("Bad block size");
    }
    if (!flusher_count)
    {
        flusher_count = 32;
    }
    if (!disk_alignment)
    {
        disk_alignment = 4096;
    }
    else if (disk_alignment % MEM_ALIGNMENT)
    {
        throw std::runtime_error("disk_alingment must be a multiple of "+std::to_string(MEM_ALIGNMENT));
    }
    if (!journal_block_size)
    {
        journal_block_size = 4096;
    }
    else if (journal_block_size % MEM_ALIGNMENT)
    {
        throw std::runtime_error("journal_block_size must be a multiple of "+std::to_string(MEM_ALIGNMENT));
    }
    if (!meta_block_size)
    {
        meta_block_size = 4096;
    }
    else if (meta_block_size % MEM_ALIGNMENT)
    {
        throw std::runtime_error("meta_block_size must be a multiple of "+std::to_string(MEM_ALIGNMENT));
    }
    if (data_offset % disk_alignment)
    {
        throw std::runtime_error("data_offset must be a multiple of disk_alignment = "+std::to_string(disk_alignment));
    }
    if (!bitmap_granularity)
    {
        bitmap_granularity = 4096;
    }
    else if (bitmap_granularity % disk_alignment)
    {
        throw std::runtime_error("Sparse write tracking granularity must be a multiple of disk_alignment = "+std::to_string(disk_alignment));
    }
    if (block_size % bitmap_granularity)
    {
        throw std::runtime_error("Block size must be a multiple of sparse write tracking granularity");
    }
    if (journal_device == meta_device || meta_device == "" && journal_device == data_device)
    {
        journal_device = "";
    }
    if (meta_device == data_device)
    {
        meta_device = "";
    }
    if (meta_offset % meta_block_size)
    {
        throw std::runtime_error("meta_offset must be a multiple of meta_block_size = "+std::to_string(meta_block_size));
    }
    if (journal.offset % journal_block_size)
    {
        throw std::runtime_error("journal_offset must be a multiple of journal_block_size = "+std::to_string(journal_block_size));
    }
    if (journal.sector_count < 2)
    {
        journal.sector_count = 32;
    }
    if (metadata_buf_size < 65536)
    {
        metadata_buf_size = 4*1024*1024;
    }
    if (meta_device == "")
    {
        disable_meta_fsync = disable_data_fsync;
    }
    if (journal_device == "")
    {
        disable_journal_fsync = disable_meta_fsync;
    }
    if (immediate_commit != IMMEDIATE_NONE && !disable_journal_fsync)
    {
        throw std::runtime_error("immediate_commit requires disable_journal_fsync");
    }
    if (immediate_commit == IMMEDIATE_ALL && !disable_data_fsync)
    {
        throw std::runtime_error("immediate_commit=all requires disable_journal_fsync and disable_data_fsync");
    }
    // init some fields
    clean_entry_bitmap_size = block_size / bitmap_granularity / 8;
    clean_entry_size = sizeof(clean_disk_entry) + clean_entry_bitmap_size;
    journal.block_size = journal_block_size;
    journal.next_free = journal_block_size;
    journal.used_start = journal_block_size;
    // no free space because sector is initially unmapped
    journal.in_sector_pos = journal_block_size;
 }
 void blockstore_impl_t::calc_lengths()
 {
    // data
    data_len = data_size - data_offset;
    if (data_fd == meta_fd && data_offset < meta_offset)
    {
        data_len = meta_offset - data_offset;
    }
    if (data_fd == journal.fd && data_offset < journal.offset)
    {
        data_len = data_len < journal.offset-data_offset
            ? data_len : journal.offset-data_offset;
    }
    if (cfg_data_size != 0)
    {
        if (data_len < cfg_data_size)
        {
            throw std::runtime_error("Data area ("+std::to_string(data_len)+
                " bytes) is less than configured size ("+std::to_string(cfg_data_size)+" bytes)");
        }
        data_len = cfg_data_size;
    }
    // meta
    meta_area = (meta_fd == data_fd ? data_size : meta_size) - meta_offset;
    if (meta_fd == data_fd && meta_offset <= data_offset)
    {
        meta_area = data_offset - meta_offset;
    }
    if (meta_fd == journal.fd && meta_offset <= journal.offset)
    {
        meta_area = meta_area < journal.offset-meta_offset
            ? meta_area : journal.offset-meta_offset;
    }
    // journal
    journal.len = (journal.fd == data_fd ? data_size : (journal.fd == meta_fd ? meta_size : journal.device_size)) - journal.offset;
    if (journal.fd == data_fd && journal.offset <= data_offset)
    {
        journal.len = data_offset - journal.offset;
    }
    if (journal.fd == meta_fd && journal.offset <= meta_offset)
    {
        journal.len = journal.len < meta_offset-journal.offset
            ? journal.len : meta_offset-journal.offset;
    }
    // required metadata size
    block_count = data_len / block_size;
    meta_len = ((block_count - 1 + meta_block_size / clean_entry_size) / (meta_block_size / clean_entry_size)) * meta_block_size;
    if (meta_area < meta_len)
    {
        throw std::runtime_error("Metadata area is too small, need at least "+std::to_string(meta_len)+" bytes");
    }
    if (inmemory_meta)
    {
        metadata_buffer = memalign(MEM_ALIGNMENT, meta_len);
        if (!metadata_buffer)
            throw std::runtime_error("Failed to allocate memory for the metadata");
    }
    else if (clean_entry_bitmap_size)
    {
        clean_bitmap = (uint8_t*)malloc(block_count * clean_entry_bitmap_size);
        if (!clean_bitmap)
            throw std::runtime_error("Failed to allocate memory for the metadata sparse write bitmap");
    }
    // requested journal size
    if (cfg_journal_size > journal.len)
    {
        throw std::runtime_error("Requested journal_size is too large");
    }
    else if (cfg_journal_size > 0)
    {
        journal.len = cfg_journal_size;
    }
    if (journal.len < MIN_JOURNAL_SIZE)
    {
        throw std::runtime_error("Journal is too small, need at least "+std::to_string(MIN_JOURNAL_SIZE)+" bytes");
    }
    if (journal.inmemory)
    {
        journal.buffer = memalign(MEM_ALIGNMENT, journal.len);
        if (!journal.buffer)
            throw std::runtime_error("Failed to allocate memory for journal");
    }
 }
 void check_size(int fd, uint64_t *size, std::string name)
 {
    int sectsize;
    struct stat st;
    if (fstat(fd, &st) < 0)
    {
        throw std::runtime_error("Failed to stat "+name);
    }
    if (S_ISREG(st.st_mode))
    {
        *size = st.st_size;
    }
    else if (S_ISBLK(st.st_mode))
    {
        if (ioctl(fd, BLKSSZGET, &sectsize) < 0 ||
            ioctl(fd, BLKGETSIZE64, size) < 0 ||
            sectsize != 512)
        {
            throw std::runtime_error(name+" sector is not equal to 512 bytes");
        }
    }
    else
    {
        throw std::runtime_error(name+" is neither a file nor a block device");
    }
 }
 void blockstore_impl_t::open_data()
 {
    data_fd = open(data_device.c_str(), O_DIRECT|O_RDWR);
    if (data_fd == -1)
    {
        throw std::runtime_error("Failed to open data device");
    }
    check_size(data_fd, &data_size, "data device");
    if (data_offset >= data_size)
    {
        throw std::runtime_error("data_offset exceeds device size = "+std::to_string(data_size));
    }
    if (!disable_flock && flock(data_fd, LOCK_EX|LOCK_NB) != 0)
    {
        throw std::runtime_error(std::string("Failed to lock data device: ") + strerror(errno));
    }
 }
 void blockstore_impl_t::open_meta()
 {
    if (meta_device != "")
    {
        meta_offset = 0;
        meta_fd = open(meta_device.c_str(), O_DIRECT|O_RDWR);
        if (meta_fd == -1)
        {
            throw std::runtime_error("Failed to open metadata device");
        }
        check_size(meta_fd, &meta_size, "metadata device");
        if (meta_offset >= meta_size)
        {
            throw std::runtime_error("meta_offset exceeds device size = "+std::to_string(meta_size));
        }
        if (!disable_flock && flock(meta_fd, LOCK_EX|LOCK_NB) != 0)
        {
            throw std::runtime_error(std::string("Failed to lock metadata device: ") + strerror(errno));
        }
    }
    else
    {
        meta_fd = data_fd;
        meta_size = 0;
        if (meta_offset >= data_size)
        {
            throw std::runtime_error("meta_offset exceeds device size = "+std::to_string(data_size));
        }
    }
 }
 void blockstore_impl_t::open_journal()
 {
    if (journal_device != "")
    {
        journal.fd = open(journal_device.c_str(), O_DIRECT|O_RDWR);
        if (journal.fd == -1)
        {
            throw std::runtime_error("Failed to open journal device");
        }
        check_size(journal.fd, &journal.device_size, "journal device");
        if (!disable_flock && flock(journal.fd, LOCK_EX|LOCK_NB) != 0)
        {
            throw std::runtime_error(std::string("Failed to lock journal device: ") + strerror(errno));
        }
    }
    else
    {
        journal.fd = meta_fd;
        journal.device_size = 0;
        if (journal.offset >= data_size)
        {
            throw std::runtime_error("journal_offset exceeds device size");
        }
    }
    journal.sector_info = (journal_sector_info_t*)calloc(journal.sector_count, sizeof(journal_sector_info_t));
    if (!journal.sector_info)
    {
        throw std::bad_alloc();
    }
    if (!journal.inmemory)
    {
        journal.sector_buf = (uint8_t*)memalign(MEM_ALIGNMENT, journal.sector_count * journal_block_size);
        if (!journal.sector_buf)
            throw std::bad_alloc();
    }
 }
--- a/blockstore_read.cpp
+++ b/blockstore_read.cpp
@ -1,236 +0,0 @@
 #include "blockstore_impl.h"
 int blockstore_impl_t::fulfill_read_push(blockstore_op_t *op, void *buf, uint64_t offset, uint64_t len,
    uint32_t item_state, uint64_t item_version)
 {
    if (!len)
    {
        // Zero-length version - skip
        return 1;
    }
    else if (IS_IN_FLIGHT(item_state))
    {
        // Write not finished yet - skip
        return 1;
    }
    else if (IS_DELETE(item_state))
    {
        // item is unallocated - return zeroes
        memset(buf, 0, len);
        return 1;
    }
    if (journal.inmemory && IS_JOURNAL(item_state))
    {
        memcpy(buf, journal.buffer + offset, len);
        return 1;
    }
    BS_SUBMIT_GET_SQE(sqe, data);
    data->iov = (struct iovec){ buf, len };
    PRIV(op)->pending_ops++;
    my_uring_prep_readv(
        sqe,
        IS_JOURNAL(item_state) ? journal.fd : data_fd,
        &data->iov, 1,
        (IS_JOURNAL(item_state) ? journal.offset : data_offset) + offset
    );
    data->callback = [this, op](ring_data_t *data) { handle_read_event(data, op); };
    return 1;
 }
 int blockstore_impl_t::fulfill_read(blockstore_op_t *read_op, uint64_t &fulfilled, uint32_t item_start, uint32_t item_end,
    uint32_t item_state, uint64_t item_version, uint64_t item_location)
 {
    uint32_t cur_start = item_start;
    if (cur_start < read_op->offset + read_op->len && item_end > read_op->offset)
    {
        cur_start = cur_start < read_op->offset ? read_op->offset : cur_start;
        item_end = item_end > read_op->offset + read_op->len ? read_op->offset + read_op->len : item_end;
        auto it = PRIV(read_op)->read_vec.begin();
        while (1)
        {
            for (; it != PRIV(read_op)->read_vec.end(); it++)
                if (it->offset >= cur_start)
                    break;
            if (it == PRIV(read_op)->read_vec.end() || it->offset > cur_start)
            {
                fulfill_read_t el = {
                    .offset = cur_start,
                    .len = it == PRIV(read_op)->read_vec.end() || it->offset >= item_end ? item_end-cur_start : it->offset-cur_start,
                };
                it = PRIV(read_op)->read_vec.insert(it, el);
                if (!fulfill_read_push(read_op,
                    read_op->buf + el.offset - read_op->offset,
                    item_location + el.offset - item_start,
                    el.len, item_state, item_version))
                {
                    return 0;
                }
                fulfilled += el.len;
            }
            cur_start = it->offset + it->len;
            if (it == PRIV(read_op)->read_vec.end() || cur_start >= item_end)
                break;
        }
    }
    return 1;
 }
 int blockstore_impl_t::dequeue_read(blockstore_op_t *read_op)
 {
    auto clean_it = clean_db.find(read_op->oid);
    auto dirty_it = dirty_db.upper_bound((obj_ver_id){
        .oid = read_op->oid,
        .version = UINT64_MAX,
    });
    if (dirty_it != dirty_db.begin())
        dirty_it--;
    bool clean_found = clean_it != clean_db.end();
    bool dirty_found = (dirty_it != dirty_db.end() && dirty_it->first.oid == read_op->oid);
    if (!clean_found && !dirty_found)
    {
        // region is not allocated - return zeroes
        memset(read_op->buf, 0, read_op->len);
        read_op->version = 0;
        read_op->retval = read_op->len;
        FINISH_OP(read_op);
        return 1;
    }
    uint64_t fulfilled = 0;
    PRIV(read_op)->pending_ops = 0;
    uint64_t result_version = 0;
    if (dirty_found)
    {
        while (dirty_it->first.oid == read_op->oid)
        {
            dirty_entry& dirty = dirty_it->second;
            bool version_ok = read_op->version >= dirty_it->first.version;
            if (IS_SYNCED(dirty.state))
            {
                if (!version_ok && read_op->version != 0)
                    read_op->version = dirty_it->first.version;
                version_ok = true;
            }
            if (version_ok)
            {
                if (!result_version)
                {
                    result_version = dirty_it->first.version;
                }
                if (!fulfill_read(read_op, fulfilled, dirty.offset, dirty.offset + dirty.len,
                    dirty.state, dirty_it->first.version, dirty.location + (IS_JOURNAL(dirty.state) ? 0 : dirty.offset)))
                {
                    // need to wait. undo added requests, don't dequeue op
                    PRIV(read_op)->read_vec.clear();
                    return 0;
                }
            }
            if (fulfilled == read_op->len || dirty_it == dirty_db.begin())
            {
                break;
            }
            dirty_it--;
        }
    }
    if (clean_it != clean_db.end())
    {
        if (!result_version)
        {
            result_version = clean_it->second.version;
        }
        if (fulfilled < read_op->len)
        {
            if (!clean_entry_bitmap_size)
            {
                if (!fulfill_read(read_op, fulfilled, 0, block_size, ST_CURRENT, 0, clean_it->second.location))
                {
                    // need to wait. undo added requests, don't dequeue op
                    PRIV(read_op)->read_vec.clear();
                    return 0;
                }
            }
            else
            {
                uint64_t meta_loc = clean_it->second.location >> block_order;
                uint8_t *clean_entry_bitmap;
                if (inmemory_meta)
                {
                    uint64_t sector = (meta_loc / (meta_block_size / clean_entry_size)) * meta_block_size;
                    uint64_t pos = (meta_loc % (meta_block_size / clean_entry_size));
                    clean_entry_bitmap = (uint8_t*)(metadata_buffer + sector + pos*clean_entry_size + sizeof(clean_disk_entry));
                }
                else
                {
                    clean_entry_bitmap = (uint8_t*)(clean_bitmap + meta_loc*clean_entry_bitmap_size);
                }
                uint64_t bmp_start = 0, bmp_end = 0, bmp_size = block_size/bitmap_granularity;
                while (bmp_start < bmp_size)
                {
                    while (!(clean_entry_bitmap[bmp_end >> 3] & (1 << (bmp_end & 0x7))) && bmp_end < bmp_size)
                    {
                        bmp_end++;
                    }
                    if (bmp_end > bmp_start)
                    {
                        // fill with zeroes
                        fulfill_read(read_op, fulfilled, bmp_start * bitmap_granularity,
                            bmp_end * bitmap_granularity, ST_DEL_STABLE, 0, 0);
                    }
                    bmp_start = bmp_end;
                    while (clean_entry_bitmap[bmp_end >> 3] & (1 << (bmp_end & 0x7)) && bmp_end < bmp_size)
                    {
                        bmp_end++;
                    }
                    if (bmp_end > bmp_start)
                    {
                        if (!fulfill_read(read_op, fulfilled, bmp_start * bitmap_granularity,
                            bmp_end * bitmap_granularity, ST_CURRENT, 0, clean_it->second.location + bmp_start * bitmap_granularity))
                        {
                            // need to wait. undo added requests, don't dequeue op
                            PRIV(read_op)->read_vec.clear();
                            return 0;
                        }
                        bmp_start = bmp_end;
                    }
                }
            }
        }
    }
    else if (fulfilled < read_op->len)
    {
        // fill remaining parts with zeroes
        fulfill_read(read_op, fulfilled, 0, block_size, ST_DEL_STABLE, 0, 0);
    }
    assert(fulfilled == read_op->len);
    read_op->version = result_version;
    if (!PRIV(read_op)->pending_ops)
    {
        // everything is fulfilled from memory
        if (!PRIV(read_op)->read_vec.size())
        {
            // region is not allocated - return zeroes
            memset(read_op->buf, 0, read_op->len);
        }
        read_op->retval = read_op->len;
        FINISH_OP(read_op);
        return 1;
    }
    read_op->retval = 0;
    return 1;
 }
 void blockstore_impl_t::handle_read_event(ring_data_t *data, blockstore_op_t *op)
 {
    live = true;
    PRIV(op)->pending_ops--;
    if (data->res != data->iov.iov_len)
    {
        // read error
        op->retval = data->res;
    }
    if (PRIV(op)->pending_ops == 0)
    {
        if (op->retval == 0)
            op->retval = op->len;
        FINISH_OP(op);
    }
 }
--- a/blockstore_rollback.cpp
+++ b/blockstore_rollback.cpp
@ -1,243 +0,0 @@
 #include "blockstore_impl.h"
 int blockstore_impl_t::dequeue_rollback(blockstore_op_t *op)
 {
    if (PRIV(op)->op_state)
    {
        return continue_rollback(op);
    }
    obj_ver_id* v;
    int i, todo = op->len;
    for (i = 0, v = (obj_ver_id*)op->buf; i < op->len; i++, v++)
    {
        // Check that there are some versions greater than v->version (which may be zero),
        // check that they're unstable, synced, and not currently written to
        auto dirty_it = dirty_db.lower_bound((obj_ver_id){
            .oid = v->oid,
            .version = UINT64_MAX,
        });
        if (dirty_it == dirty_db.begin())
        {
            if (v->version == 0)
            {
                // Already rolled back
                // FIXME Skip this object version
            }
        bad_op:
            op->retval = -ENOENT;
            FINISH_OP(op);
            return 1;
        }
        else
        {
            dirty_it--;
            if (dirty_it->first.oid != v->oid || dirty_it->first.version < v->version)
            {
                goto bad_op;
            }
            while (dirty_it->first.oid == v->oid && dirty_it->first.version > v->version)
            {
                if (!IS_SYNCED(dirty_it->second.state) ||
                    IS_STABLE(dirty_it->second.state))
                {
                    op->retval = -EBUSY;
                    FINISH_OP(op);
                    return 1;
                }
                if (dirty_it == dirty_db.begin())
                {
                    break;
                }
                dirty_it--;
            }
        }
    }
    // Check journal space
    blockstore_journal_check_t space_check(this);
    if (!space_check.check_available(op, todo, sizeof(journal_entry_rollback), 0))
    {
        return 0;
    }
    // There is sufficient space. Get SQEs
    struct io_uring_sqe *sqe[space_check.sectors_required];
    for (i = 0; i < space_check.sectors_required; i++)
    {
        BS_SUBMIT_GET_SQE_DECL(sqe[i]);
    }
    // Prepare and submit journal entries
    auto cb = [this, op](ring_data_t *data) { handle_rollback_event(data, op); };
    int s = 0, cur_sector = -1;
    if ((journal_block_size - journal.in_sector_pos) < sizeof(journal_entry_rollback) &&
        journal.sector_info[journal.cur_sector].dirty)
    {
        if (cur_sector == -1)
            PRIV(op)->min_flushed_journal_sector = 1 + journal.cur_sector;
        cur_sector = journal.cur_sector;
        prepare_journal_sector_write(journal, cur_sector, sqe[s++], cb);
    }
    for (i = 0, v = (obj_ver_id*)op->buf; i < op->len; i++, v++)
    {
        journal_entry_rollback *je = (journal_entry_rollback*)
            prefill_single_journal_entry(journal, JE_ROLLBACK, sizeof(journal_entry_rollback));
        journal.sector_info[journal.cur_sector].dirty = false;
        je->oid = v->oid;
        je->version = v->version;
        je->crc32 = je_crc32((journal_entry*)je);
        journal.crc32_last = je->crc32;
        if (cur_sector != journal.cur_sector)
        {
            if (cur_sector == -1)
                PRIV(op)->min_flushed_journal_sector = 1 + journal.cur_sector;
            cur_sector = journal.cur_sector;
            prepare_journal_sector_write(journal, cur_sector, sqe[s++], cb);
        }
    }
    PRIV(op)->max_flushed_journal_sector = 1 + journal.cur_sector;
    PRIV(op)->pending_ops = s;
    PRIV(op)->op_state = 1;
    inflight_writes++;
    return 1;
 }
 int blockstore_impl_t::continue_rollback(blockstore_op_t *op)
 {
    if (PRIV(op)->op_state == 2)
        goto resume_2;
    else if (PRIV(op)->op_state == 3)
        goto resume_3;
    else if (PRIV(op)->op_state == 5)
        goto resume_5;
    else
        return 1;
 resume_2:
    // Release used journal sectors
    release_journal_sectors(op);
 resume_3:
    if (!disable_journal_fsync)
    {
        io_uring_sqe *sqe = get_sqe();
        if (!sqe)
        {
            return 0;
        }
        ring_data_t *data = ((ring_data_t*)sqe->user_data);
        my_uring_prep_fsync(sqe, journal.fd, IORING_FSYNC_DATASYNC);
        data->iov = { 0 };
        data->callback = [this, op](ring_data_t *data) { handle_rollback_event(data, op); };
        PRIV(op)->min_flushed_journal_sector = PRIV(op)->max_flushed_journal_sector = 0;
        PRIV(op)->pending_ops = 1;
        PRIV(op)->op_state = 4;
        return 1;
    }
 resume_5:
    obj_ver_id* v;
    int i;
    for (i = 0, v = (obj_ver_id*)op->buf; i < op->len; i++, v++)
    {
        mark_rolled_back(*v);
    }
    journal.trim();
    inflight_writes--;
    // Acknowledge op
    op->retval = 0;
    FINISH_OP(op);
    return 1;
 }
 void blockstore_impl_t::mark_rolled_back(const obj_ver_id & ov)
 {
    auto it = dirty_db.lower_bound((obj_ver_id){
        .oid = ov.oid,
        .version = UINT64_MAX,
    });
    if (it != dirty_db.begin())
    {
        uint64_t max_unstable = 0;
        auto rm_start = it;
        auto rm_end = it;
        it--;
        while (it->first.oid == ov.oid &&
            it->first.version > ov.version &&
            !IS_IN_FLIGHT(it->second.state) &&
            !IS_STABLE(it->second.state))
        {
            if (it->first.oid != ov.oid)
                break;
            else if (it->first.version <= ov.version)
            {
                if (!IS_STABLE(it->second.state))
                    max_unstable = it->first.version;
                break;
            }
            else if (IS_STABLE(it->second.state))
                break;
            // Remove entry
            rm_start = it;
            if (it == dirty_db.begin())
                break;
            it--;
        }
        if (rm_start != rm_end)
        {
            erase_dirty(rm_start, rm_end, UINT64_MAX);
        }
        auto unstab_it = unstable_writes.find(ov.oid);
        if (unstab_it != unstable_writes.end())
        {
            if (max_unstable == 0)
                unstable_writes.erase(unstab_it);
            else
                unstab_it->second = max_unstable;
        }
    }
 }
 void blockstore_impl_t::handle_rollback_event(ring_data_t *data, blockstore_op_t *op)
 {
    live = true;
    if (data->res != data->iov.iov_len)
    {
        inflight_writes--;
        throw std::runtime_error(
            "write operation failed ("+std::to_string(data->res)+" != "+std::to_string(data->iov.iov_len)+
            "). in-memory state is corrupted. AAAAAAAaaaaaaaaa!!!111"
        );
    }
    PRIV(op)->pending_ops--;
    if (PRIV(op)->pending_ops == 0)
    {
        PRIV(op)->op_state++;
        if (!continue_rollback(op))
        {
            submit_queue.push_front(op);
        }
    }
 }
 void blockstore_impl_t::erase_dirty(blockstore_dirty_db_t::iterator dirty_start, blockstore_dirty_db_t::iterator dirty_end, uint64_t clean_loc)
 {
    auto dirty_it = dirty_end;
    while (dirty_it != dirty_start)
    {
        dirty_it--;
        if (IS_BIG_WRITE(dirty_it->second.state) && dirty_it->second.location != clean_loc)
        {
 #ifdef BLOCKSTORE_DEBUG
            printf("Free block %lu\n", dirty_it->second.location >> block_order);
 #endif
            data_alloc->set(dirty_it->second.location >> block_order, false);
        }
        int used = --journal.used_sectors[dirty_it->second.journal_sector];
 #ifdef BLOCKSTORE_DEBUG
        printf(
            "remove usage of journal offset %08lx by %lu:%lu v%lu (%d refs)\n", dirty_it->second.journal_sector,
            dirty_it->first.oid.inode, dirty_it->first.oid.stripe, dirty_it->first.version, used
        );
 #endif
        if (used == 0)
        {
            journal.used_sectors.erase(dirty_it->second.journal_sector);
        }
    }
    dirty_db.erase(dirty_start, dirty_end);
 }
--- a/blockstore_stable.cpp
+++ b/blockstore_stable.cpp
@ -1,246 +0,0 @@
 #include "blockstore_impl.h"
 // Stabilize small write:
 // 1) Copy data from the journal to the data device
 // 2) Increase version on the metadata device and sync it
 // 3) Advance clean_db entry's version, clear previous journal entries
 //
 // This makes 1 4K small write+sync look like:
 // 512b+4K (journal) + sync + 512b (journal) + sync + 4K (data) [+ sync?] + 512b (metadata) + sync.
 // WA = 2.375. It's not the best, SSD FTL-like redirect-write could probably be lower
 // even with defragmentation. But it's fixed and it's still better than in Ceph. :)
 // except for HDD-only clusters, because each write results in 3 seeks.
 // Stabilize big write:
 // 1) Copy metadata from the journal to the metadata device
 // 2) Move dirty_db entry to clean_db and clear previous journal entries
 //
 // This makes 1 128K big write+sync look like:
 // 128K (data) + sync + 512b (journal) + sync + 512b (journal) + sync + 512b (metadata) + sync.
 // WA = 1.012. Very good :)
 // Stabilize delete:
 // 1) Remove metadata entry and sync it
 // 2) Remove dirty_db entry and clear previous journal entries
 // We have 2 problems here:
 // - In the cluster environment, we must store the "tombstones" of deleted objects until
 //   all replicas (not just quorum) agrees about their deletion. That is, "stabilize" is
 //   not possible for deletes in degraded placement groups
 // - With simple "fixed" metadata tables we can't just clear the metadata entry of the latest
 //   object version. We must clear all previous entries, too.
 // FIXME Fix both problems - probably, by switching from "fixed" metadata tables to "dynamic"
 // AND We must do it in batches, for the sake of reduced fsync call count
 // AND We must know what we stabilize. Basic workflow is like:
 // 1) primary OSD receives sync request
 // 2) it submits syncs to blockstore and peers
 // 3) after everyone acks sync it acks sync to the client
 // 4) after a while it takes his synced object list and sends stabilize requests
 //    to peers and to its own blockstore, thus freeing the old version
 int blockstore_impl_t::dequeue_stable(blockstore_op_t *op)
 {
    if (PRIV(op)->op_state)
    {
        return continue_stable(op);
    }
    obj_ver_id* v;
    int i, todo = 0;
    for (i = 0, v = (obj_ver_id*)op->buf; i < op->len; i++, v++)
    {
        auto dirty_it = dirty_db.find(*v);
        if (dirty_it == dirty_db.end())
        {
            auto clean_it = clean_db.find(v->oid);
            if (clean_it == clean_db.end() || clean_it->second.version < v->version)
            {
                // No such object version
                op->retval = -ENOENT;
                FINISH_OP(op);
                return 1;
            }
            else
            {
                // Already stable
            }
        }
        else if (IS_UNSYNCED(dirty_it->second.state))
        {
            // Object not synced yet. Caller must sync it first
            op->retval = -EBUSY;
            FINISH_OP(op);
            return 1;
        }
        else if (!IS_STABLE(dirty_it->second.state))
        {
            todo++;
        }
    }
    if (!todo)
    {
        // Already stable
        op->retval = 0;
        FINISH_OP(op);
        return 1;
    }
    // Check journal space
    blockstore_journal_check_t space_check(this);
    if (!space_check.check_available(op, todo, sizeof(journal_entry_stable), 0))
    {
        return 0;
    }
    // There is sufficient space. Get SQEs
    struct io_uring_sqe *sqe[space_check.sectors_required];
    for (i = 0; i < space_check.sectors_required; i++)
    {
        BS_SUBMIT_GET_SQE_DECL(sqe[i]);
    }
    // Prepare and submit journal entries
    auto cb = [this, op](ring_data_t *data) { handle_stable_event(data, op); };
    int s = 0, cur_sector = -1;
    if ((journal_block_size - journal.in_sector_pos) < sizeof(journal_entry_stable) &&
        journal.sector_info[journal.cur_sector].dirty)
    {
        if (cur_sector == -1)
            PRIV(op)->min_flushed_journal_sector = 1 + journal.cur_sector;
        cur_sector = journal.cur_sector;
        prepare_journal_sector_write(journal, cur_sector, sqe[s++], cb);
    }
    for (i = 0, v = (obj_ver_id*)op->buf; i < op->len; i++, v++)
    {
        // FIXME: Only stabilize versions that aren't stable yet
        journal_entry_stable *je = (journal_entry_stable*)
            prefill_single_journal_entry(journal, JE_STABLE, sizeof(journal_entry_stable));
        journal.sector_info[journal.cur_sector].dirty = false;
        je->oid = v->oid;
        je->version = v->version;
        je->crc32 = je_crc32((journal_entry*)je);
        journal.crc32_last = je->crc32;
        if (cur_sector != journal.cur_sector)
        {
            if (cur_sector == -1)
                PRIV(op)->min_flushed_journal_sector = 1 + journal.cur_sector;
            cur_sector = journal.cur_sector;
            prepare_journal_sector_write(journal, cur_sector, sqe[s++], cb);
        }
    }
    PRIV(op)->max_flushed_journal_sector = 1 + journal.cur_sector;
    PRIV(op)->pending_ops = s;
    PRIV(op)->op_state = 1;
    inflight_writes++;
    return 1;
 }
 int blockstore_impl_t::continue_stable(blockstore_op_t *op)
 {
    if (PRIV(op)->op_state == 2)
        goto resume_2;
    else if (PRIV(op)->op_state == 3)
        goto resume_3;
    else if (PRIV(op)->op_state == 5)
        goto resume_5;
    else
        return 1;
 resume_2:
    // Release used journal sectors
    release_journal_sectors(op);
 resume_3:
    if (!disable_journal_fsync)
    {
        io_uring_sqe *sqe = get_sqe();
        if (!sqe)
        {
            return 0;
        }
        ring_data_t *data = ((ring_data_t*)sqe->user_data);
        my_uring_prep_fsync(sqe, journal.fd, IORING_FSYNC_DATASYNC);
        data->iov = { 0 };
        data->callback = [this, op](ring_data_t *data) { handle_stable_event(data, op); };
        PRIV(op)->min_flushed_journal_sector = PRIV(op)->max_flushed_journal_sector = 0;
        PRIV(op)->pending_ops = 1;
        PRIV(op)->op_state = 4;
        return 1;
    }
 resume_5:
    // Mark dirty_db entries as stable, acknowledge op completion
    obj_ver_id* v;
    int i;
    for (i = 0, v = (obj_ver_id*)op->buf; i < op->len; i++, v++)
    {
        // Mark all dirty_db entries up to op->version as stable
        mark_stable(*v);
    }
    inflight_writes--;
    // Acknowledge op
    op->retval = 0;
    FINISH_OP(op);
    return 1;
 }
 void blockstore_impl_t::mark_stable(const obj_ver_id & v)
 {
    auto dirty_it = dirty_db.find(v);
    if (dirty_it != dirty_db.end())
    {
        while (1)
        {
            if (dirty_it->second.state == ST_J_SYNCED)
            {
                dirty_it->second.state = ST_J_STABLE;
            }
            else if (dirty_it->second.state == ST_D_SYNCED)
            {
                dirty_it->second.state = ST_D_STABLE;
            }
            else if (dirty_it->second.state == ST_DEL_SYNCED)
            {
                dirty_it->second.state = ST_DEL_STABLE;
            }
            else if (IS_STABLE(dirty_it->second.state))
            {
                break;
            }
            if (dirty_it == dirty_db.begin())
            {
                break;
            }
            dirty_it--;
            if (dirty_it->first.oid != v.oid)
            {
                break;
            }
        }
 #ifdef BLOCKSTORE_DEBUG
        printf("enqueue_flush %lu:%lu v%lu\n", v.oid.inode, v.oid.stripe, v.version);
 #endif
        flusher->enqueue_flush(v);
    }
    auto unstab_it = unstable_writes.find(v.oid);
    if (unstab_it != unstable_writes.end() &&
        unstab_it->second <= v.version)
    {
        unstable_writes.erase(unstab_it);
    }
 }
 void blockstore_impl_t::handle_stable_event(ring_data_t *data, blockstore_op_t *op)
 {
    live = true;
    if (data->res != data->iov.iov_len)
    {
        inflight_writes--;
        throw std::runtime_error(
            "write operation failed ("+std::to_string(data->res)+" != "+std::to_string(data->iov.iov_len)+
            "). in-memory state is corrupted. AAAAAAAaaaaaaaaa!!!111"
        );
    }
    PRIV(op)->pending_ops--;
    if (PRIV(op)->pending_ops == 0)
    {
        PRIV(op)->op_state++;
        if (!continue_stable(op))
        {
            submit_queue.push_front(op);
        }
    }
 }
--- a/blockstore_sync.cpp
+++ b/blockstore_sync.cpp
@ -1,292 +0,0 @@
 #include "blockstore_impl.h"
 #define SYNC_HAS_SMALL 1
 #define SYNC_HAS_BIG 2
 #define SYNC_DATA_SYNC_SENT 3
 #define SYNC_DATA_SYNC_DONE 4
 #define SYNC_JOURNAL_WRITE_SENT 5
 #define SYNC_JOURNAL_WRITE_DONE 6
 #define SYNC_JOURNAL_SYNC_SENT 7
 #define SYNC_DONE 8
 int blockstore_impl_t::dequeue_sync(blockstore_op_t *op)
 {
    if (PRIV(op)->op_state == 0)
    {
        stop_sync_submitted = false;
        PRIV(op)->sync_big_writes.swap(unsynced_big_writes);
        PRIV(op)->sync_small_writes.swap(unsynced_small_writes);
        PRIV(op)->sync_small_checked = 0;
        PRIV(op)->sync_big_checked = 0;
        unsynced_big_writes.clear();
        unsynced_small_writes.clear();
        if (PRIV(op)->sync_big_writes.size() > 0)
            PRIV(op)->op_state = SYNC_HAS_BIG;
        else if (PRIV(op)->sync_small_writes.size() > 0)
            PRIV(op)->op_state = SYNC_HAS_SMALL;
        else
            PRIV(op)->op_state = SYNC_DONE;
        // Always add sync to in_progress_syncs because we clear unsynced_big_writes and unsynced_small_writes
        PRIV(op)->prev_sync_count = in_progress_syncs.size();
        PRIV(op)->in_progress_ptr = in_progress_syncs.insert(in_progress_syncs.end(), op);
    }
    continue_sync(op);
    // Always dequeue because we always add syncs to in_progress_syncs
    return 1;
 }
 int blockstore_impl_t::continue_sync(blockstore_op_t *op)
 {
    auto cb = [this, op](ring_data_t *data) { handle_sync_event(data, op); };
    if (PRIV(op)->op_state == SYNC_HAS_SMALL)
    {
        // No big writes, just fsync the journal
        for (; PRIV(op)->sync_small_checked < PRIV(op)->sync_small_writes.size(); PRIV(op)->sync_small_checked++)
        {
            if (IS_IN_FLIGHT(dirty_db[PRIV(op)->sync_small_writes[PRIV(op)->sync_small_checked]].state))
            {
                // Wait for small inflight writes to complete
                return 0;
            }
        }
        if (journal.sector_info[journal.cur_sector].dirty)
        {
            // Write out the last journal sector if it happens to be dirty
            BS_SUBMIT_GET_ONLY_SQE(sqe);
            prepare_journal_sector_write(journal, journal.cur_sector, sqe, cb);
            PRIV(op)->min_flushed_journal_sector = PRIV(op)->max_flushed_journal_sector = 1 + journal.cur_sector;
            PRIV(op)->pending_ops = 1;
            PRIV(op)->op_state = SYNC_JOURNAL_WRITE_SENT;
            return 1;
        }
        else
        {
            PRIV(op)->op_state = SYNC_JOURNAL_WRITE_DONE;
        }
    }
    if (PRIV(op)->op_state == SYNC_HAS_BIG)
    {
        for (; PRIV(op)->sync_big_checked < PRIV(op)->sync_big_writes.size(); PRIV(op)->sync_big_checked++)
        {
            if (IS_IN_FLIGHT(dirty_db[PRIV(op)->sync_big_writes[PRIV(op)->sync_big_checked]].state))
            {
                // Wait for big inflight writes to complete
                return 0;
            }
        }
        // 1st step: fsync data
        if (!disable_data_fsync)
        {
            BS_SUBMIT_GET_SQE(sqe, data);
            my_uring_prep_fsync(sqe, data_fd, IORING_FSYNC_DATASYNC);
            data->iov = { 0 };
            data->callback = cb;
            PRIV(op)->min_flushed_journal_sector = PRIV(op)->max_flushed_journal_sector = 0;
            PRIV(op)->pending_ops = 1;
            PRIV(op)->op_state = SYNC_DATA_SYNC_SENT;
            return 1;
        }
        else
        {
            PRIV(op)->op_state = SYNC_DATA_SYNC_DONE;
        }
    }
    if (PRIV(op)->op_state == SYNC_DATA_SYNC_DONE)
    {
        for (; PRIV(op)->sync_small_checked < PRIV(op)->sync_small_writes.size(); PRIV(op)->sync_small_checked++)
        {
            if (IS_IN_FLIGHT(dirty_db[PRIV(op)->sync_small_writes[PRIV(op)->sync_small_checked]].state))
            {
                // Wait for small inflight writes to complete
                return 0;
            }
        }
        // 2nd step: Data device is synced, prepare & write journal entries
        // Check space in the journal and journal memory buffers
        blockstore_journal_check_t space_check(this);
        if (!space_check.check_available(op, PRIV(op)->sync_big_writes.size(), sizeof(journal_entry_big_write), 0))
        {
            return 0;
        }
        // Get SQEs. Don't bother about merging, submit each journal sector as a separate request
        struct io_uring_sqe *sqe[space_check.sectors_required];
        for (int i = 0; i < space_check.sectors_required; i++)
        {
            BS_SUBMIT_GET_SQE_DECL(sqe[i]);
        }
        // Prepare and submit journal entries
        auto it = PRIV(op)->sync_big_writes.begin();
        int s = 0, cur_sector = -1;
        if ((journal_block_size - journal.in_sector_pos) < sizeof(journal_entry_big_write) &&
            journal.sector_info[journal.cur_sector].dirty)
        {
            if (cur_sector == -1)
                PRIV(op)->min_flushed_journal_sector = 1 + journal.cur_sector;
            cur_sector = journal.cur_sector;
            prepare_journal_sector_write(journal, cur_sector, sqe[s++], cb);
        }
        while (it != PRIV(op)->sync_big_writes.end())
        {
            journal_entry_big_write *je = (journal_entry_big_write*)
                prefill_single_journal_entry(journal, JE_BIG_WRITE, sizeof(journal_entry_big_write));
            dirty_db[*it].journal_sector = journal.sector_info[journal.cur_sector].offset;
            journal.sector_info[journal.cur_sector].dirty = false;
            journal.used_sectors[journal.sector_info[journal.cur_sector].offset]++;
 #ifdef BLOCKSTORE_DEBUG
            printf(
                "journal offset %08lx is used by %lu:%lu v%lu (%lu refs)\n",
                dirty_db[*it].journal_sector, it->oid.inode, it->oid.stripe, it->version,
                journal.used_sectors[journal.sector_info[journal.cur_sector].offset]
            );
 #endif
            je->oid = it->oid;
            je->version = it->version;
            je->offset = dirty_db[*it].offset;
            je->len = dirty_db[*it].len;
            je->location = dirty_db[*it].location;
            je->crc32 = je_crc32((journal_entry*)je);
            journal.crc32_last = je->crc32;
            it++;
            if (cur_sector != journal.cur_sector)
            {
                if (cur_sector == -1)
                    PRIV(op)->min_flushed_journal_sector = 1 + journal.cur_sector;
                cur_sector = journal.cur_sector;
                prepare_journal_sector_write(journal, cur_sector, sqe[s++], cb);
            }
        }
        PRIV(op)->max_flushed_journal_sector = 1 + journal.cur_sector;
        PRIV(op)->pending_ops = s;
        PRIV(op)->op_state = SYNC_JOURNAL_WRITE_SENT;
        return 1;
    }
    if (PRIV(op)->op_state == SYNC_JOURNAL_WRITE_DONE)
    {
        if (!disable_journal_fsync)
        {
            BS_SUBMIT_GET_SQE(sqe, data);
            my_uring_prep_fsync(sqe, journal.fd, IORING_FSYNC_DATASYNC);
            data->iov = { 0 };
            data->callback = cb;
            PRIV(op)->pending_ops = 1;
            PRIV(op)->op_state = SYNC_JOURNAL_SYNC_SENT;
            return 1;
        }
        else
        {
            PRIV(op)->op_state = SYNC_DONE;
        }
    }
    if (PRIV(op)->op_state == SYNC_DONE)
    {
        return ack_sync(op);
    }
    return 1;
 }
 void blockstore_impl_t::handle_sync_event(ring_data_t *data, blockstore_op_t *op)
 {
    live = true;
    if (data->res != data->iov.iov_len)
    {
        throw std::runtime_error(
            "write operation failed ("+std::to_string(data->res)+" != "+std::to_string(data->iov.iov_len)+
            "). in-memory state is corrupted. AAAAAAAaaaaaaaaa!!!111"
        );
    }
    PRIV(op)->pending_ops--;
    if (PRIV(op)->pending_ops == 0)
    {
        // Release used journal sectors
        release_journal_sectors(op);
        // Handle states
        if (PRIV(op)->op_state == SYNC_DATA_SYNC_SENT)
        {
            PRIV(op)->op_state = SYNC_DATA_SYNC_DONE;
        }
        else if (PRIV(op)->op_state == SYNC_JOURNAL_WRITE_SENT)
        {
            PRIV(op)->op_state = SYNC_JOURNAL_WRITE_DONE;
        }
        else if (PRIV(op)->op_state == SYNC_JOURNAL_SYNC_SENT)
        {
            PRIV(op)->op_state = SYNC_DONE;
            ack_sync(op);
        }
        else
        {
            throw std::runtime_error("BUG: unexpected sync op state");
        }
    }
 }
 int blockstore_impl_t::ack_sync(blockstore_op_t *op)
 {
    if (PRIV(op)->op_state == SYNC_DONE && PRIV(op)->prev_sync_count == 0)
    {
        // Remove dependency of subsequent syncs
        auto it = PRIV(op)->in_progress_ptr;
        int done_syncs = 1;
        ++it;
        // Acknowledge sync
        ack_one_sync(op);
        while (it != in_progress_syncs.end())
        {
            auto & next_sync = *it++;
            PRIV(next_sync)->prev_sync_count -= done_syncs;
            if (PRIV(next_sync)->prev_sync_count == 0 && PRIV(next_sync)->op_state == SYNC_DONE)
            {
                done_syncs++;
                // Acknowledge next_sync
                ack_one_sync(next_sync);
            }
        }
        return 2;
    }
    return 0;
 }
 void blockstore_impl_t::ack_one_sync(blockstore_op_t *op)
 {
    // Handle states
    for (auto it = PRIV(op)->sync_big_writes.begin(); it != PRIV(op)->sync_big_writes.end(); it++)
    {
 #ifdef BLOCKSTORE_DEBUG
        printf("Ack sync big %lu:%lu v%lu\n", it->oid.inode, it->oid.stripe, it->version);
 #endif
        auto & unstab = unstable_writes[it->oid];
        unstab = unstab < it->version ? it->version : unstab;
        auto dirty_it = dirty_db.find(*it);
        dirty_it->second.state = ST_D_SYNCED;
        dirty_it++;
        while (dirty_it != dirty_db.end() && dirty_it->first.oid == it->oid)
        {
            if (dirty_it->second.state == ST_J_WAIT_BIG)
            {
                dirty_it->second.state = ST_J_IN_FLIGHT;
            }
            dirty_it++;
        }
    }
    for (auto it = PRIV(op)->sync_small_writes.begin(); it != PRIV(op)->sync_small_writes.end(); it++)
    {
 #ifdef BLOCKSTORE_DEBUG
        printf("Ack sync small %lu:%lu v%lu\n", it->oid.inode, it->oid.stripe, it->version);
 #endif
        auto & unstab = unstable_writes[it->oid];
        unstab = unstab < it->version ? it->version : unstab;
        if (dirty_db[*it].state == ST_DEL_WRITTEN)
        {
            dirty_db[*it].state = ST_DEL_SYNCED;
            // Deletions are treated as immediately stable
            mark_stable(*it);
        }
        else /* == ST_J_WRITTEN */
        {
            dirty_db[*it].state = ST_J_SYNCED;
        }
    }
    in_progress_syncs.erase(PRIV(op)->in_progress_ptr);
    op->retval = 0;
    FINISH_OP(op);
 }
--- a/blockstore_write.cpp
+++ b/blockstore_write.cpp
@ -1,512 +0,0 @@
 #include "blockstore_impl.h"
 bool blockstore_impl_t::enqueue_write(blockstore_op_t *op)
 {
    // Check or assign version number
    bool found = false, deleted = false, is_del = (op->opcode == BS_OP_DELETE);
    bool is_inflight_big = false;
    uint64_t version = 1;
    if (dirty_db.size() > 0)
    {
        auto dirty_it = dirty_db.upper_bound((obj_ver_id){
            .oid = op->oid,
            .version = UINT64_MAX,
        });
        dirty_it--; // segfaults when dirty_db is empty
        if (dirty_it != dirty_db.end() && dirty_it->first.oid == op->oid)
        {
            found = true;
            version = dirty_it->first.version + 1;
            deleted = IS_DELETE(dirty_it->second.state);
            is_inflight_big = dirty_it->second.state >= ST_D_IN_FLIGHT &&
                dirty_it->second.state < ST_D_SYNCED ||
                dirty_it->second.state == ST_J_WAIT_BIG;
        }
    }
    if (!found)
    {
        auto clean_it = clean_db.find(op->oid);
        if (clean_it != clean_db.end())
        {
            version = clean_it->second.version + 1;
        }
        else
        {
            deleted = true;
        }
    }
    if (op->version == 0)
    {
        op->version = version;
    }
    else if (op->version < version)
    {
        // Invalid version requested
        op->retval = -EEXIST;
        return false;
    }
    if (deleted && is_del)
    {
        // Already deleted
        op->retval = 0;
        return false;
    }
    if (is_inflight_big && !is_del && !deleted && op->len < block_size &&
        immediate_commit != IMMEDIATE_ALL)
    {
        // Issue an additional sync so that the previous big write can reach the journal
        blockstore_op_t *sync_op = new blockstore_op_t;
        sync_op->opcode = BS_OP_SYNC;
        sync_op->callback = [this, op](blockstore_op_t *sync_op)
        {
            delete sync_op;
        };
        enqueue_op(sync_op);
    }
 #ifdef BLOCKSTORE_DEBUG
    if (is_del)
        printf("Delete %lu:%lu v%lu\n", op->oid.inode, op->oid.stripe, op->version);
    else
        printf("Write %lu:%lu v%lu offset=%u len=%u\n", op->oid.inode, op->oid.stripe, op->version, op->offset, op->len);
 #endif
    // No strict need to add it into dirty_db here, it's just left
    // from the previous implementation where reads waited for writes
    dirty_db.emplace((obj_ver_id){
        .oid = op->oid,
        .version = op->version,
    }, (dirty_entry){
        .state = (uint32_t)(
            is_del
                ? ST_DEL_IN_FLIGHT
                : (op->len == block_size || deleted ? ST_D_IN_FLIGHT : (is_inflight_big ? ST_J_WAIT_BIG : ST_J_IN_FLIGHT))
        ),
        .flags = 0,
        .location = 0,
        .offset = is_del ? 0 : op->offset,
        .len = is_del ? 0 : op->len,
        .journal_sector = 0,
    });
    return true;
 }
 // First step of the write algorithm: dequeue operation and submit initial write(s)
 int blockstore_impl_t::dequeue_write(blockstore_op_t *op)
 {
    if (PRIV(op)->op_state)
    {
        return continue_write(op);
    }
    auto dirty_it = dirty_db.find((obj_ver_id){
        .oid = op->oid,
        .version = op->version,
    });
    assert(dirty_it != dirty_db.end());
    if (dirty_it->second.state == ST_J_WAIT_BIG)
    {
        return 0;
    }
    else if (dirty_it->second.state == ST_D_IN_FLIGHT)
    {
        blockstore_journal_check_t space_check(this);
        if (!space_check.check_available(op, unsynced_big_writes.size() + 1, sizeof(journal_entry_big_write), JOURNAL_STABILIZE_RESERVATION))
        {
            return 0;
        }
        // Big (redirect) write
        uint64_t loc = data_alloc->find_free();
        if (loc == UINT64_MAX)
        {
            // no space
            if (flusher->is_active())
            {
                // hope that some space will be available after flush
                PRIV(op)->wait_for = WAIT_FREE;
                return 0;
            }
            op->retval = -ENOSPC;
            FINISH_OP(op);
            return 1;
        }
        BS_SUBMIT_GET_SQE(sqe, data);
        dirty_it->second.location = loc << block_order;
        dirty_it->second.state = ST_D_SUBMITTED;
 #ifdef BLOCKSTORE_DEBUG
        printf("Allocate block %lu\n", loc);
 #endif
        data_alloc->set(loc, true);
        uint64_t stripe_offset = (op->offset % bitmap_granularity);
        uint64_t stripe_end = (op->offset + op->len) % bitmap_granularity;
        // Zero fill up to bitmap_granularity
        int vcnt = 0;
        if (stripe_offset)
        {
            PRIV(op)->iov_zerofill[vcnt++] = (struct iovec){ zero_object, stripe_offset };
        }
        PRIV(op)->iov_zerofill[vcnt++] = (struct iovec){ op->buf, op->len };
        if (stripe_end)
        {
            stripe_end = bitmap_granularity - stripe_end;
            PRIV(op)->iov_zerofill[vcnt++] = (struct iovec){ zero_object, stripe_end };
        }
        data->iov.iov_len = op->len + stripe_offset + stripe_end; // to check it in the callback
        data->callback = [this, op](ring_data_t *data) { handle_write_event(data, op); };
        my_uring_prep_writev(
            sqe, data_fd, PRIV(op)->iov_zerofill, vcnt, data_offset + (loc << block_order) + op->offset - stripe_offset
        );
        PRIV(op)->pending_ops = 1;
        PRIV(op)->min_flushed_journal_sector = PRIV(op)->max_flushed_journal_sector = 0;
        if (immediate_commit != IMMEDIATE_ALL)
        {
            // Remember big write as unsynced
            unsynced_big_writes.push_back((obj_ver_id){
                .oid = op->oid,
                .version = op->version,
            });
            PRIV(op)->op_state = 3;
        }
        else
        {
            PRIV(op)->op_state = 1;
        }
    }
    else
    {
        // Small (journaled) write
        // First check if the journal has sufficient space
        blockstore_journal_check_t space_check(this);
        if (unsynced_big_writes.size() && !space_check.check_available(op, unsynced_big_writes.size(), sizeof(journal_entry_big_write), 0)
            || !space_check.check_available(op, 1, sizeof(journal_entry_small_write), op->len + JOURNAL_STABILIZE_RESERVATION))
        {
            return 0;
        }
        // There is sufficient space. Get SQE(s)
        struct io_uring_sqe *sqe1 = NULL;
        if (immediate_commit != IMMEDIATE_NONE ||
            (journal_block_size - journal.in_sector_pos) < sizeof(journal_entry_small_write) &&
            journal.sector_info[journal.cur_sector].dirty)
        {
            // Write current journal sector only if it's dirty and full, or in the immediate_commit mode
            BS_SUBMIT_GET_SQE_DECL(sqe1);
        }
        struct io_uring_sqe *sqe2 = NULL;
        if (op->len > 0)
        {
            BS_SUBMIT_GET_SQE_DECL(sqe2);
        }
        // Got SQEs. Prepare previous journal sector write if required
        auto cb = [this, op](ring_data_t *data) { handle_write_event(data, op); };
        if (immediate_commit == IMMEDIATE_NONE)
        {
            if (sqe1)
            {
                prepare_journal_sector_write(journal, journal.cur_sector, sqe1, cb);
                PRIV(op)->min_flushed_journal_sector = PRIV(op)->max_flushed_journal_sector = 1 + journal.cur_sector;
                PRIV(op)->pending_ops++;
            }
            else
            {
                PRIV(op)->min_flushed_journal_sector = PRIV(op)->max_flushed_journal_sector = 0;
            }
        }
        // Then pre-fill journal entry
        journal_entry_small_write *je = (journal_entry_small_write*)
            prefill_single_journal_entry(journal, JE_SMALL_WRITE, sizeof(journal_entry_small_write));
        dirty_it->second.journal_sector = journal.sector_info[journal.cur_sector].offset;
        journal.used_sectors[journal.sector_info[journal.cur_sector].offset]++;
 #ifdef BLOCKSTORE_DEBUG
        printf(
            "journal offset %08lx is used by %lu:%lu v%lu (%lu refs)\n",
            dirty_it->second.journal_sector, dirty_it->first.oid.inode, dirty_it->first.oid.stripe, dirty_it->first.version,
            journal.used_sectors[journal.sector_info[journal.cur_sector].offset]
        );
 #endif
        // Figure out where data will be
        journal.next_free = (journal.next_free + op->len) <= journal.len ? journal.next_free : journal_block_size;
        je->oid = op->oid;
        je->version = op->version;
        je->offset = op->offset;
        je->len = op->len;
        je->data_offset = journal.next_free;
        je->crc32_data = crc32c(0, op->buf, op->len);
        je->crc32 = je_crc32((journal_entry*)je);
        journal.crc32_last = je->crc32;
        if (immediate_commit != IMMEDIATE_NONE)
        {
            prepare_journal_sector_write(journal, journal.cur_sector, sqe1, cb);
            PRIV(op)->min_flushed_journal_sector = PRIV(op)->max_flushed_journal_sector = 1 + journal.cur_sector;
            PRIV(op)->pending_ops++;
        }
        if (op->len > 0)
        {
            // Prepare journal data write
            if (journal.inmemory)
            {
                // Copy data
                memcpy(journal.buffer + journal.next_free, op->buf, op->len);
            }
            ring_data_t *data2 = ((ring_data_t*)sqe2->user_data);
            data2->iov = (struct iovec){ op->buf, op->len };
            data2->callback = cb;
            my_uring_prep_writev(
                sqe2, journal.fd, &data2->iov, 1, journal.offset + journal.next_free
            );
            PRIV(op)->pending_ops++;
        }
        else
        {
            // Zero-length overwrite. Allowed to bump object version in EC placement groups without actually writing data
        }
        dirty_it->second.location = journal.next_free;
        dirty_it->second.state = ST_J_SUBMITTED;
        journal.next_free += op->len;
        if (journal.next_free >= journal.len)
        {
            journal.next_free = journal_block_size;
        }
        if (immediate_commit == IMMEDIATE_NONE)
        {
            // Remember small write as unsynced
            unsynced_small_writes.push_back((obj_ver_id){
                .oid = op->oid,
                .version = op->version,
            });
        }
        if (!PRIV(op)->pending_ops)
        {
            PRIV(op)->op_state = 4;
            continue_write(op);
        }
        else
        {
            PRIV(op)->op_state = 3;
        }
    }
    inflight_writes++;
    return 1;
 }
 int blockstore_impl_t::continue_write(blockstore_op_t *op)
 {
    io_uring_sqe *sqe = NULL;
    journal_entry_big_write *je;
    auto dirty_it = dirty_db.find((obj_ver_id){
        .oid = op->oid,
        .version = op->version,
    });
    assert(dirty_it != dirty_db.end());
    if (PRIV(op)->op_state == 2)
        goto resume_2;
    else if (PRIV(op)->op_state == 4)
        goto resume_4;
    else
        return 1;
 resume_2:
    // Only for the immediate_commit mode: prepare and submit big_write journal entry
    sqe = get_sqe();
    if (!sqe)
    {
        return 0;
    }
    je = (journal_entry_big_write*)prefill_single_journal_entry(journal, JE_BIG_WRITE, sizeof(journal_entry_big_write));
    dirty_it->second.journal_sector = journal.sector_info[journal.cur_sector].offset;
    journal.sector_info[journal.cur_sector].dirty = false;
    journal.used_sectors[journal.sector_info[journal.cur_sector].offset]++;
 #ifdef BLOCKSTORE_DEBUG
    printf(
        "journal offset %08lx is used by %lu:%lu v%lu (%lu refs)\n",
        journal.sector_info[journal.cur_sector].offset, op->oid.inode, op->oid.stripe, op->version,
        journal.used_sectors[journal.sector_info[journal.cur_sector].offset]
    );
 #endif
    je->oid = op->oid;
    je->version = op->version;
    je->offset = op->offset;
    je->len = op->len;
    je->location = dirty_it->second.location;
    je->crc32 = je_crc32((journal_entry*)je);
    journal.crc32_last = je->crc32;
    prepare_journal_sector_write(journal, journal.cur_sector, sqe,
        [this, op](ring_data_t *data) { handle_write_event(data, op); });
    PRIV(op)->min_flushed_journal_sector = PRIV(op)->max_flushed_journal_sector = 1 + journal.cur_sector;
    PRIV(op)->pending_ops = 1;
    PRIV(op)->op_state = 3;
    return 1;
 resume_4:
    // Switch object state
 #ifdef BLOCKSTORE_DEBUG
    printf("Ack write %lu:%lu v%lu = %d\n", op->oid.inode, op->oid.stripe, op->version, dirty_it->second.state);
 #endif
    bool imm = dirty_it->second.state == ST_D_SUBMITTED
        ? (immediate_commit == IMMEDIATE_ALL)
        : (immediate_commit != IMMEDIATE_NONE);
    if (imm)
    {
        auto & unstab = unstable_writes[op->oid];
        unstab = unstab < op->version ? op->version : unstab;
    }
    if (dirty_it->second.state == ST_J_SUBMITTED)
    {
        dirty_it->second.state = imm ? ST_J_SYNCED : ST_J_WRITTEN;
    }
    else if (dirty_it->second.state == ST_D_SUBMITTED)
    {
        dirty_it->second.state = imm ? ST_D_SYNCED : ST_D_WRITTEN;
    }
    else if (dirty_it->second.state == ST_DEL_SUBMITTED)
    {
        dirty_it->second.state = imm ? ST_DEL_SYNCED : ST_DEL_WRITTEN;
        if (imm)
        {
            // Deletions are treated as immediately stable
            mark_stable(dirty_it->first);
        }
    }
    if (immediate_commit == IMMEDIATE_ALL)
    {
        dirty_it++;
        while (dirty_it != dirty_db.end() && dirty_it->first.oid == op->oid)
        {
            if (dirty_it->second.state == ST_J_WAIT_BIG)
            {
                dirty_it->second.state = ST_J_IN_FLIGHT;
            }
            dirty_it++;
        }
    }
    inflight_writes--;
    // Acknowledge write
    op->retval = op->len;
    FINISH_OP(op);
    return 1;
 }
 void blockstore_impl_t::handle_write_event(ring_data_t *data, blockstore_op_t *op)
 {
    live = true;
    if (data->res != data->iov.iov_len)
    {
        inflight_writes--;
        // FIXME: our state becomes corrupted after a write error. maybe do something better than just die
        throw std::runtime_error(
            "write operation failed ("+std::to_string(data->res)+" != "+std::to_string(data->iov.iov_len)+
            "). in-memory state is corrupted. AAAAAAAaaaaaaaaa!!!111"
        );
    }
    PRIV(op)->pending_ops--;
    if (PRIV(op)->pending_ops == 0)
    {
        release_journal_sectors(op);
        PRIV(op)->op_state++;
        if (!continue_write(op))
        {
            submit_queue.push_front(op);
        }
    }
 }
 void blockstore_impl_t::release_journal_sectors(blockstore_op_t *op)
 {
    // Release flushed journal sectors
    if (PRIV(op)->min_flushed_journal_sector > 0 &&
        PRIV(op)->max_flushed_journal_sector > 0)
    {
        uint64_t s = PRIV(op)->min_flushed_journal_sector;
        while (1)
        {
            journal.sector_info[s-1].usage_count--;
            if (s != (1+journal.cur_sector) && journal.sector_info[s-1].usage_count == 0)
            {
                // We know for sure that we won't write into this sector anymore
                uint64_t new_ds = journal.sector_info[s-1].offset + journal.block_size;
                if (new_ds >= journal.len)
                {
                    new_ds = journal.block_size;
                }
                if ((journal.dirty_start + (journal.dirty_start >= journal.used_start ? 0 : journal.len)) <
                    (new_ds + (new_ds >= journal.used_start ? 0 : journal.len)))
                {
                    journal.dirty_start = new_ds;
                }
            }
            if (s == PRIV(op)->max_flushed_journal_sector)
                break;
            s = 1 + s % journal.sector_count;
        }
        PRIV(op)->min_flushed_journal_sector = PRIV(op)->max_flushed_journal_sector = 0;
    }
 }
 int blockstore_impl_t::dequeue_del(blockstore_op_t *op)
 {
    auto dirty_it = dirty_db.find((obj_ver_id){
        .oid = op->oid,
        .version = op->version,
    });
    assert(dirty_it != dirty_db.end());
    blockstore_journal_check_t space_check(this);
    if (!space_check.check_available(op, 1, sizeof(journal_entry_del), 0))
    {
        return 0;
    }
    io_uring_sqe *sqe = NULL;
    if (immediate_commit != IMMEDIATE_NONE ||
        (journal_block_size - journal.in_sector_pos) < sizeof(journal_entry_del) &&
        journal.sector_info[journal.cur_sector].dirty)
    {
        // Write current journal sector only if it's dirty and full, or in the immediate_commit mode
        BS_SUBMIT_GET_SQE_DECL(sqe);
    }
    auto cb = [this, op](ring_data_t *data) { handle_write_event(data, op); };
    // Prepare journal sector write
    if (immediate_commit == IMMEDIATE_NONE)
    {
        if (sqe)
        {
            prepare_journal_sector_write(journal, journal.cur_sector, sqe, cb);
            PRIV(op)->min_flushed_journal_sector = PRIV(op)->max_flushed_journal_sector = 1 + journal.cur_sector;
            PRIV(op)->pending_ops++;
        }
        else
        {
            PRIV(op)->min_flushed_journal_sector = PRIV(op)->max_flushed_journal_sector = 0;
        }
    }
    // Pre-fill journal entry
    journal_entry_del *je = (journal_entry_del*)
        prefill_single_journal_entry(journal, JE_DELETE, sizeof(struct journal_entry_del));
    dirty_it->second.journal_sector = journal.sector_info[journal.cur_sector].offset;
    journal.used_sectors[journal.sector_info[journal.cur_sector].offset]++;
 #ifdef BLOCKSTORE_DEBUG
    printf(
        "journal offset %08lx is used by %lu:%lu v%lu (%lu refs)\n",
        dirty_it->second.journal_sector, dirty_it->first.oid.inode, dirty_it->first.oid.stripe, dirty_it->first.version,
        journal.used_sectors[journal.sector_info[journal.cur_sector].offset]
    );
 #endif
    je->oid = op->oid;
    je->version = op->version;
    je->crc32 = je_crc32((journal_entry*)je);
    journal.crc32_last = je->crc32;
    dirty_it->second.state = ST_DEL_SUBMITTED;
    if (immediate_commit != IMMEDIATE_NONE)
    {
        prepare_journal_sector_write(journal, journal.cur_sector, sqe, cb);
        PRIV(op)->min_flushed_journal_sector = PRIV(op)->max_flushed_journal_sector = 1 + journal.cur_sector;
        PRIV(op)->pending_ops++;
        // Remember small write as unsynced
        unsynced_small_writes.push_back((obj_ver_id){
            .oid = op->oid,
            .version = op->version,
        });
    }
    if (!PRIV(op)->pending_ops)
    {
        PRIV(op)->op_state = 4;
        continue_write(op);
    }
    else
    {
        PRIV(op)->op_state = 3;
    }
    return 1;
 }
--- a/cluster_client.cpp
+++ b/cluster_client.cpp
@ -1,349 +0,0 @@
 #include "cluster_client.h"
 cluster_client_t::cluster_client_t(ring_loop_t *ringloop, timerfd_manager_t *tfd, json11::Json & config)
 {
    this->ringloop = ringloop;
    this->tfd = tfd;
    msgr.tfd = tfd;
    msgr.ringloop = ringloop;
    msgr.repeer_pgs = [this](osd_num_t peer_osd)
    {
        // peer_osd just connected or dropped connection
        if (msgr.osd_peer_fds.find(peer_osd) != msgr.osd_peer_fds.end())
        {
            // really connected :)
            continue_ops();
        }
    };
    st_cli.tfd = tfd;
    st_cli.on_load_config_hook = [this](json11::Json::object & cfg) { on_load_config_hook(cfg); };
    st_cli.on_change_osd_state_hook = [this](uint64_t peer_osd) { on_change_osd_state_hook(peer_osd); };
    st_cli.on_change_hook = [this](json11::Json::object & changes) { on_change_hook(changes); };
    st_cli.on_load_pgs_hook = [this](bool success) { on_load_pgs_hook(success); };
    log_level = config["log_level"].int64_value();
    st_cli.parse_config(config);
    st_cli.load_global_config();
 }
 void cluster_client_t::continue_ops()
 {
    for (auto op_it = unsent_ops.begin(); op_it != unsent_ops.end(); )
    {
        cluster_op_t *op = *op_it;
        if (op->needs_reslice && !op->sent_count)
        {
            op->parts.clear();
            op->done_count = 0;
            op->needs_reslice = false;
        }
        if (!op->parts.size())
        {
            unsent_ops.erase(op_it++);
            execute(op);
            continue;
        }
        if (!op->needs_reslice)
        {
            for (auto & op_part: op->parts)
            {
                if (!op_part.sent && !op_part.done)
                {
                    try_send(op, &op_part);
                }
            }
            if (op->sent_count == op->parts.size() - op->done_count)
            {
                unsent_ops.erase(op_it++);
                sent_ops.insert(op);
            }
            else
                op_it++;
        }
        else
            op_it++;
    }
 }
 static uint32_t is_power_of_two(uint64_t value)
 {
    uint32_t l = 0;
    while (value > 1)
    {
        if (value & 1)
        {
            return 64;
        }
        value = value >> 1;
        l++;
    }
    return l;
 }
 void cluster_client_t::on_load_config_hook(json11::Json::object & config)
 {
    bs_block_size = config["block_size"].uint64_value();
    bs_disk_alignment = config["disk_alignment"].uint64_value();
    bs_bitmap_granularity = config["bitmap_granularity"].uint64_value();
    if (!bs_block_size)
        bs_block_size = DEFAULT_BLOCK_SIZE;
    if (!bs_disk_alignment)
        bs_disk_alignment = DEFAULT_DISK_ALIGNMENT;
    if (!bs_bitmap_granularity)
        bs_bitmap_granularity = DEFAULT_BITMAP_GRANULARITY;
    {
        uint32_t block_order;
        if ((block_order = is_power_of_two(bs_block_size)) >= 64 || bs_block_size < MIN_BLOCK_SIZE || bs_block_size >= MAX_BLOCK_SIZE)
            throw std::runtime_error("Bad block size");
    }
    if (config.find("pg_stripe_size") != config.end())
    {
        pg_stripe_size = config["pg_stripe_size"].uint64_value();
        if (!pg_stripe_size)
            pg_stripe_size = DEFAULT_PG_STRIPE_SIZE;
    }
    if (config["immediate_commit"] == "all")
    {
        // Cluster-wide immediate_commit mode
        immediate_commit = true;
    }
    msgr.peer_connect_interval = config["peer_connect_interval"].uint64_value();
    if (!msgr.peer_connect_interval)
        msgr.peer_connect_interval = DEFAULT_PEER_CONNECT_INTERVAL;
    msgr.peer_connect_timeout = config["peer_connect_timeout"].uint64_value();
    if (!msgr.peer_connect_timeout)
        msgr.peer_connect_timeout = DEFAULT_PEER_CONNECT_TIMEOUT;
 }
 void cluster_client_t::on_load_pgs_hook(bool success)
 {
    if (success)
    {
        pg_count = st_cli.pg_config.size();
        continue_ops();
    }
 }
 void cluster_client_t::on_change_hook(json11::Json::object & changes)
 {
    if (pg_count != st_cli.pg_config.size())
    {
        // At this point, all operations should be suspended
        // And they need to be resliced!
        for (auto op: unsent_ops)
        {
            op->needs_reslice = true;
        }
        for (auto op: sent_ops)
        {
            op->needs_reslice = true;
        }
        pg_count = st_cli.pg_config.size();
    }
    continue_ops();
 }
 void cluster_client_t::on_change_osd_state_hook(uint64_t peer_osd)
 {
    if (msgr.wanted_peers.find(peer_osd) != msgr.wanted_peers.end())
    {
        msgr.connect_peer(peer_osd, st_cli.peer_states[peer_osd]);
    }
 }
 // FIXME: Implement OSD_OP_SYNC for immediate_commit == false
 void cluster_client_t::execute(cluster_op_t *op)
 {
    if (op->opcode == OSD_OP_SYNC && immediate_commit)
    {
        // Syncs are not required in the immediate_commit mode
        op->retval = 0;
        std::function<void(cluster_op_t*)>(op->callback)(op);
        return;
    }
    if (op->opcode != OSD_OP_READ && op->opcode != OSD_OP_OUT || !op->inode || !op->len ||
        op->offset % bs_disk_alignment || op->len % bs_disk_alignment)
    {
        op->retval = -EINVAL;
        std::function<void(cluster_op_t*)>(op->callback)(op);
        return;
    }
    if (!pg_stripe_size)
    {
        // Config is not loaded yet
        unsent_ops.insert(op);
        return;
    }
    if (op->opcode == OSD_OP_WRITE && !immediate_commit)
    {
        // Copy operation
        cluster_op_t *op_copy = new cluster_op_t();
        op_copy->opcode = op->opcode;
        op_copy->inode = op->inode;
        op_copy->offset = op->offset;
        op_copy->len = op->len;
        op_copy->buf = malloc(op->len);
        memcpy(op_copy->buf, op->buf, op->len);
        unsynced_ops.push_back(op_copy);
        unsynced_bytes += op->len;
        if (inmemory_commit)
        {
            // Immediately acknowledge write and continue with the copy
            op->retval = op->len;
            std::function<void(cluster_op_t*)>(op->callback)(op);
            op = op_copy;
        }
        if (unsynced_bytes >= inmemory_dirty_limit)
        {
            // Push an extra SYNC operation
        }
    }
    // Slice the request into individual object stripe requests
    // Primary OSDs still operate individual stripes, but their size is multiplied by PG minsize in case of EC
    uint64_t pg_block_size = bs_block_size * pg_part_count;
    uint64_t first_stripe = (op->offset / pg_block_size) * pg_block_size;
    uint64_t last_stripe = ((op->offset + op->len + pg_block_size - 1) / pg_block_size - 1) * pg_block_size;
    int part_count = 0;
    for (uint64_t stripe = first_stripe; stripe <= last_stripe; stripe += pg_block_size)
    {
        if (op->offset < (stripe+pg_block_size) && (op->offset+op->len) > stripe)
        {
            part_count++;
        }
    }
    op->parts.resize(part_count);
    bool resend = false;
    int i = 0;
    for (uint64_t stripe = first_stripe; stripe <= last_stripe; stripe += pg_block_size)
    {
        uint64_t stripe_end = stripe + pg_block_size;
        if (op->offset < stripe_end && (op->offset+op->len) > stripe)
        {
            pg_num_t pg_num = (op->inode + stripe/pg_stripe_size) % pg_count + 1;
            op->parts[i] = {
                .parent = op,
                .offset = op->offset < stripe ? stripe : op->offset,
                .len = (uint32_t)((op->offset+op->len) > stripe_end ? pg_block_size : op->offset+op->len-stripe),
                .pg_num = pg_num,
                .buf = op->buf + (op->offset < stripe ? stripe-op->offset : 0),
                .sent = false,
                .done = false,
            };
            if (!try_send(op, &op->parts[i]))
            {
                // Part needs to be sent later
                resend = true;
            }
            i++;
        }
    }
    if (resend)
    {
        unsent_ops.insert(op);
    }
    else
    {
        sent_ops.insert(op);
    }
 }
 bool cluster_client_t::try_send(cluster_op_t *op, cluster_op_part_t *part)
 {
    auto pg_it = st_cli.pg_config.find(part->pg_num);
    if (pg_it != st_cli.pg_config.end() &&
        !pg_it->second.pause && pg_it->second.cur_primary)
    {
        osd_num_t primary_osd = pg_it->second.cur_primary;
        auto peer_it = msgr.osd_peer_fds.find(primary_osd);
        if (peer_it != msgr.osd_peer_fds.end())
        {
            int peer_fd = peer_it->second;
            part->osd_num = primary_osd;
            part->sent = true;
            op->sent_count++;
            part->op = {
                .op_type = OSD_OP_OUT,
                .peer_fd = peer_fd,
                .req = { .rw = {
                    .header = {
                        .magic = SECONDARY_OSD_OP_MAGIC,
                        .id = op_id++,
                        .opcode = op->opcode,
                    },
                    .inode = op->inode,
                    .offset = part->offset,
                    .len = part->len,
                } },
                .callback = [this, part](osd_op_t *op_part)
                {
                    handle_op_part(part);
                },
            };
            part->op.send_list.push_back(part->op.req.buf, OSD_PACKET_SIZE);
            if (op->opcode == OSD_OP_WRITE)
            {
                part->op.send_list.push_back(part->buf, part->len);
            }
            else
            {
                part->op.buf = part->buf;
            }
            msgr.outbox_push(&part->op);
            return true;
        }
        else if (msgr.wanted_peers.find(primary_osd) == msgr.wanted_peers.end())
        {
            msgr.connect_peer(primary_osd, st_cli.peer_states[primary_osd]);
        }
    }
    return false;
 }
 void cluster_client_t::handle_op_part(cluster_op_part_t *part)
 {
    cluster_op_t *op = part->parent;
    part->sent = false;
    op->sent_count--;
    part->op.buf = NULL;
    if (part->op.reply.hdr.retval != part->op.req.rw.len)
    {
        // Operation failed, retry
        printf(
            "Operation part failed on OSD %lu: retval=%ld (expected %u), reconnecting\n",
            part->osd_num, part->op.reply.hdr.retval, part->op.req.rw.len
        );
        msgr.stop_client(part->op.peer_fd);
        if (op->sent_count == op->parts.size() - op->done_count - 1)
        {
            // Resend later when OSDs come up
            // FIXME: Check for different types of errors
            // FIXME: Repeat operations after a small timeout, for the case when OSD is coming up
            sent_ops.erase(op);
            unsent_ops.insert(op);
        }
        if (op->sent_count == 0 && op->needs_reslice)
        {
            // PG count has changed, reslice the operation
            unsent_ops.erase(op);
            op->parts.clear();
            op->done_count = 0;
            op->needs_reslice = false;
            execute(op);
        }
    }
    else
    {
        // OK
        part->done = true;
        op->done_count++;
        if (op->done_count >= op->parts.size())
        {
            // Finished!
            sent_ops.erase(op);
            op->retval = op->len;
            std::function<void(cluster_op_t*)>(op->callback)(op);
        }
    }
 }
--- a/cluster_client.h
+++ b/cluster_client.h
@ -1,80 +0,0 @@
 #pragma once
 #include "messenger.h"
 #include "etcd_state_client.h"
 #define MIN_BLOCK_SIZE 4*1024
 #define MAX_BLOCK_SIZE 128*1024*1024
 #define DEFAULT_BLOCK_SIZE 128*1024
 #define DEFAULT_PG_STRIPE_SIZE 4*1024*1024
 #define DEFAULT_DISK_ALIGNMENT 4096
 #define DEFAULT_BITMAP_GRANULARITY 4096
 struct cluster_op_t;
 struct cluster_op_part_t
 {
    cluster_op_t *parent;
    uint64_t offset;
    uint32_t len;
    pg_num_t pg_num;
    osd_num_t osd_num;
    void *buf;
    bool sent;
    bool done;
    osd_op_t op;
 };
 struct cluster_op_t
 {
    uint64_t opcode; // OSD_OP_READ, OSD_OP_WRITE, OSD_OP_SYNC
    uint64_t inode;
    uint64_t offset;
    uint64_t len;
    int retval;
    void *buf;
    std::function<void(cluster_op_t*)> callback;
 protected:
    bool needs_reslice = false;
    int sent_count = 0, done_count = 0;
    std::vector<cluster_op_part_t> parts;
    friend class cluster_client_t;
 };
 class cluster_client_t
 {
    timerfd_manager_t *tfd;
    ring_loop_t *ringloop;
    uint64_t pg_part_count = 2;
    uint64_t pg_stripe_size = 0;
    uint64_t bs_block_size = 0;
    uint64_t bs_disk_alignment = 0;
    uint64_t bs_bitmap_granularity = 0;
    uint64_t pg_count = 0;
    bool immediate_commit = false;
    bool inmemory_commit = false;
    uint64_t inmemory_dirty_limit = 32*1024*1024;
    int log_level;
    uint64_t op_id = 1;
    etcd_state_client_t st_cli;
    osd_messenger_t msgr;
    std::set<cluster_op_t*> sent_ops, unsent_ops;
    // unsynced operations are copied in memory to allow replay when cluster isn't in the immediate_commit mode
    std::vector<cluster_op_t*> unsynced_ops;
    uint64_t unsynced_bytes = 0;
 public:
    cluster_client_t(ring_loop_t *ringloop, timerfd_manager_t *tfd, json11::Json & config);
    void execute(cluster_op_t *op);
 protected:
    void continue_ops();
    void on_load_config_hook(json11::Json::object & cfg);
    void on_load_pgs_hook(bool success);
    void on_change_hook(json11::Json::object & changes);
    void on_change_osd_state_hook(uint64_t peer_osd);
    bool try_send(cluster_op_t *op, cluster_op_part_t *part);
    void handle_op_part(cluster_op_part_t *part);
 };
--- a/copy-fio-includes.sh
+++ b/copy-fio-includes.sh
@ -0,0 +1,13 @@
 #!/bin/bash
 gcc -I. -E -o fio_headers.i src/util/fio_headers.h
 rm -rf fio-copy
 for i in `grep -Po 'fio/[^"]+' fio_headers.i | sort | uniq`; do
    j=${i##fio/}
    p=$(dirname $j)
    mkdir -p fio-copy/$p
    cp $i fio-copy/$j
 done
 rm fio_headers.i
--- a/copy-qemu-includes.sh
+++ b/copy-qemu-includes.sh
@ -0,0 +1,18 @@
 #!/bin/bash
 #cd qemu
 #debian/rules b/configure-stamp
 #cd b/qemu; make qapi
 gcc -I qemu/b/qemu `pkg-config glib-2.0 --cflags` \
    -I qemu/include -E -o qemu_driver.i src/client/qemu_driver.c
 rm -rf qemu-copy
 for i in `grep -Po 'qemu/[^"]+' qemu_driver.i | sort | uniq`; do
    j=${i##qemu/}
    p=$(dirname $j)
    mkdir -p qemu-copy/$p
    cp $i qemu-copy/$j
 done
 rm qemu_driver.i
--- a/1
+++ b/1
@ -0,0 +1 @@
 Subproject commit 8de8b467acbca50cfd8835c20e0e379110f3b32b
--- a/csi/.dockerignore
+++ b/csi/.dockerignore
@ -0,0 +1,2 @@
 vitastor-csi
 Dockerfile
--- a/csi/Dockerfile
+++ b/csi/Dockerfile
@ -0,0 +1,48 @@
 # 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 \
        # 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/
 RUN (echo deb http://vitastor.io/debian bookworm main > /etc/apt/sources.list.d/vitastor.list) && \
    ((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 && \
    wget https://vitastor.io/archive/qemu/qemu-bookworm-8.1.2%2Bds-1%2Bvitastor1/qemu-utils_8.1.2%2Bds-1%2Bvitastor1_amd64.deb && \
    wget https://vitastor.io/archive/qemu/qemu-bookworm-8.1.2%2Bds-1%2Bvitastor1/qemu-block-extra_8.1.2%2Bds-1%2Bvitastor1_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"]
--- a/csi/Makefile
+++ b/csi/Makefile
@ -0,0 +1,9 @@
 VERSION ?= v1.6.1
 all: build push
 build:
 	@docker build --rm -t vitalif/vitastor-csi:$(VERSION) .
 push:
 	@docker push vitalif/vitastor-csi:$(VERSION)
--- a/csi/deploy/000-csi-namespace.yaml
+++ b/csi/deploy/000-csi-namespace.yaml
@ -0,0 +1,5 @@
 ---
 apiVersion: v1
 kind: Namespace
 metadata:
  name: vitastor-system
--- a/csi/deploy/001-csi-config-map.yaml
+++ b/csi/deploy/001-csi-config-map.yaml
@ -0,0 +1,10 @@
 ---
 apiVersion: v1
 kind: ConfigMap
 data:
  # You can add multiple configuration files here to use a multi-cluster setup
  vitastor.conf: |-
    {"etcd_address":"http://192.168.7.2:2379","etcd_prefix":"/vitastor"}
 metadata:
  namespace: vitastor-system
  name: vitastor-config
--- a/csi/deploy/002-csi-nodeplugin-rbac.yaml
+++ b/csi/deploy/002-csi-nodeplugin-rbac.yaml
@ -0,0 +1,37 @@
 ---
 apiVersion: v1
 kind: ServiceAccount
 metadata:
  namespace: vitastor-system
  name: vitastor-csi-nodeplugin
 ---
 kind: ClusterRole
 apiVersion: rbac.authorization.k8s.io/v1
 metadata:
  namespace: vitastor-system
  name: vitastor-csi-nodeplugin
 rules:
  - apiGroups: [""]
    resources: ["nodes"]
    verbs: ["get"]
  # allow to read Vault Token and connection options from the Tenants namespace
  - apiGroups: [""]
    resources: ["secrets"]
    verbs: ["get"]
  - apiGroups: [""]
    resources: ["configmaps"]
    verbs: ["get"]
 ---
 kind: ClusterRoleBinding
 apiVersion: rbac.authorization.k8s.io/v1
 metadata:
  namespace: vitastor-system
  name: vitastor-csi-nodeplugin
 subjects:
  - kind: ServiceAccount
    name: vitastor-csi-nodeplugin
    namespace: vitastor-system
 roleRef:
  kind: ClusterRole
  name: vitastor-csi-nodeplugin
  apiGroup: rbac.authorization.k8s.io
--- a/csi/deploy/003-csi-nodeplugin-psp.yaml
+++ b/csi/deploy/003-csi-nodeplugin-psp.yaml
@ -0,0 +1,72 @@
 ---
 apiVersion: policy/v1beta1
 kind: PodSecurityPolicy
 metadata:
  namespace: vitastor-system
  name: vitastor-csi-nodeplugin-psp
 spec:
  allowPrivilegeEscalation: true
  allowedCapabilities:
    - 'SYS_ADMIN'
  fsGroup:
    rule: RunAsAny
  privileged: true
  hostNetwork: true
  hostPID: true
  runAsUser:
    rule: RunAsAny
  seLinux:
    rule: RunAsAny
  supplementalGroups:
    rule: RunAsAny
  volumes:
    - 'configMap'
    - 'emptyDir'
    - 'projected'
    - 'secret'
    - 'downwardAPI'
    - 'hostPath'
  allowedHostPaths:
    - pathPrefix: '/dev'
      readOnly: false
    - pathPrefix: '/run/mount'
      readOnly: false
    - pathPrefix: '/sys'
      readOnly: false
    - pathPrefix: '/lib/modules'
      readOnly: true
    - pathPrefix: '/var/lib/kubelet/pods'
      readOnly: false
    - pathPrefix: '/var/lib/kubelet/plugins/csi.vitastor.io'
      readOnly: false
    - pathPrefix: '/var/lib/kubelet/plugins_registry'
      readOnly: false
    - pathPrefix: '/var/lib/kubelet/plugins'
      readOnly: false
 ---
 kind: Role
 apiVersion: rbac.authorization.k8s.io/v1
 metadata:
  namespace: vitastor-system
  name: vitastor-csi-nodeplugin-psp
 rules:
  - apiGroups: ['policy']
    resources: ['podsecuritypolicies']
    verbs: ['use']
    resourceNames: ['vitastor-csi-nodeplugin-psp']
 ---
 kind: RoleBinding
 apiVersion: rbac.authorization.k8s.io/v1
 metadata:
  namespace: vitastor-system
  name: vitastor-csi-nodeplugin-psp
 subjects:
  - kind: ServiceAccount
    name: vitastor-csi-nodeplugin
    namespace: vitastor-system
 roleRef:
  kind: Role
  name: vitastor-csi-nodeplugin-psp
  apiGroup: rbac.authorization.k8s.io
--- a/csi/deploy/004-csi-nodeplugin.yaml
+++ b/csi/deploy/004-csi-nodeplugin.yaml
@ -0,0 +1,145 @@
 ---
 kind: DaemonSet
 apiVersion: apps/v1
 metadata:
  namespace: vitastor-system
  name: csi-vitastor
 spec:
  selector:
    matchLabels:
      app: csi-vitastor
  template:
    metadata:
      namespace: vitastor-system
      labels:
        app: csi-vitastor
    spec:
      serviceAccountName: vitastor-csi-nodeplugin
      hostNetwork: true
      hostPID: true
      priorityClassName: system-node-critical
      # to use e.g. Rook orchestrated cluster, and mons' FQDN is
      # resolved through k8s service, set dns policy to cluster first
      dnsPolicy: ClusterFirstWithHostNet
      containers:
        - name: driver-registrar
          # This is necessary only for systems with SELinux, where
          # non-privileged sidecar containers cannot access unix domain socket
          # created by privileged CSI driver container.
          securityContext:
            privileged: true
          image: k8s.gcr.io/sig-storage/csi-node-driver-registrar:v2.2.0
          args:
            - "--v=5"
            - "--csi-address=/csi/csi.sock"
            - "--kubelet-registration-path=/var/lib/kubelet/plugins/csi.vitastor.io/csi.sock"
          env:
            - name: KUBE_NODE_NAME
              valueFrom:
                fieldRef:
                  fieldPath: spec.nodeName
          volumeMounts:
            - name: socket-dir
              mountPath: /csi
            - name: registration-dir
              mountPath: /registration
        - name: csi-vitastor
          securityContext:
            privileged: true
            capabilities:
              add: ["SYS_ADMIN"]
            allowPrivilegeEscalation: true
          image: vitalif/vitastor-csi:v1.6.1
          args:
            - "--node=$(NODE_ID)"
            - "--endpoint=$(CSI_ENDPOINT)"
          env:
            - name: NODE_ID
              valueFrom:
                fieldRef:
                  fieldPath: spec.nodeName
            - name: CSI_ENDPOINT
              value: unix:///csi/csi.sock
          imagePullPolicy: "IfNotPresent"
          ports:
          - containerPort: 9898
            name: healthz
            protocol: TCP
          livenessProbe:
            failureThreshold: 5
            httpGet:
              path: /healthz
              port: healthz
            initialDelaySeconds: 10
            timeoutSeconds: 3
            periodSeconds: 2
          volumeMounts:
            - name: socket-dir
              mountPath: /csi
            - mountPath: /dev
              name: host-dev
            - mountPath: /sys
              name: host-sys
            - mountPath: /run/mount
              name: host-mount
            - mountPath: /run/vitastor-csi
              name: run-vitastor-csi
            - mountPath: /lib/modules
              name: lib-modules
              readOnly: true
            - name: vitastor-config
              mountPath: /etc/vitastor
            - name: plugin-dir
              mountPath: /var/lib/kubelet/plugins
              mountPropagation: "Bidirectional"
            - name: mountpoint-dir
              mountPath: /var/lib/kubelet/pods
              mountPropagation: "Bidirectional"
        - name: liveness-probe
          securityContext:
            privileged: true
          image: quay.io/k8scsi/livenessprobe:v1.1.0
          args:
            - "--csi-address=$(CSI_ENDPOINT)"
            - "--health-port=9898"
          env:
            - name: CSI_ENDPOINT
              value: unix:///csi/csi.sock
          volumeMounts:
          - mountPath: /csi
            name: socket-dir
      volumes:
        - name: socket-dir
          hostPath:
            path: /var/lib/kubelet/plugins/csi.vitastor.io
            type: DirectoryOrCreate
        - name: plugin-dir
          hostPath:
            path: /var/lib/kubelet/plugins
            type: Directory
        - name: mountpoint-dir
          hostPath:
            path: /var/lib/kubelet/pods
            type: DirectoryOrCreate
        - name: registration-dir
          hostPath:
            path: /var/lib/kubelet/plugins_registry/
            type: Directory
        - name: host-dev
          hostPath:
            path: /dev
        - name: host-sys
          hostPath:
            path: /sys
        - name: host-mount
          hostPath:
            path: /run/mount
        - name: run-vitastor-csi
          hostPath:
            path: /run/vitastor-csi
        - name: lib-modules
          hostPath:
            path: /lib/modules
        - name: vitastor-config
          configMap:
            name: vitastor-config
--- a/csi/deploy/005-csi-provisioner-rbac.yaml
+++ b/csi/deploy/005-csi-provisioner-rbac.yaml
@ -0,0 +1,105 @@
 ---
 apiVersion: v1
 kind: ServiceAccount
 metadata:
  namespace: vitastor-system
  name: vitastor-csi-provisioner
 ---
 kind: ClusterRole
 apiVersion: rbac.authorization.k8s.io/v1
 metadata:
  namespace: vitastor-system
  name: vitastor-external-provisioner-runner
 rules:
  - apiGroups: [""]
    resources: ["nodes"]
    verbs: ["get", "list", "watch"]
  - apiGroups: [""]
    resources: ["secrets"]
    verbs: ["get", "list", "watch"]
  - apiGroups: [""]
    resources: ["events"]
    verbs: ["list", "watch", "create", "update", "patch"]
  - apiGroups: [""]
    resources: ["persistentvolumes"]
    verbs: ["get", "list", "watch", "create", "update", "delete", "patch"]
  - apiGroups: [""]
    resources: ["persistentvolumeclaims"]
    verbs: ["get", "list", "watch", "update"]
  - apiGroups: [""]
    resources: ["persistentvolumeclaims/status"]
    verbs: ["update", "patch"]
  - apiGroups: ["storage.k8s.io"]
    resources: ["storageclasses"]
    verbs: ["get", "list", "watch"]
  - apiGroups: ["snapshot.storage.k8s.io"]
    resources: ["volumesnapshots"]
    verbs: ["get", "list", "patch"]
  - apiGroups: ["snapshot.storage.k8s.io"]
    resources: ["volumesnapshots/status"]
    verbs: ["get", "list", "patch"]
  - apiGroups: ["snapshot.storage.k8s.io"]
    resources: ["volumesnapshotcontents"]
    verbs: ["create", "get", "list", "watch", "update", "delete", "patch"]
  - apiGroups: ["snapshot.storage.k8s.io"]
    resources: ["volumesnapshotclasses"]
    verbs: ["get", "list", "watch"]
  - apiGroups: ["storage.k8s.io"]
    resources: ["volumeattachments"]
    verbs: ["get", "list", "watch", "update", "patch"]
  - apiGroups: ["storage.k8s.io"]
    resources: ["volumeattachments/status"]
    verbs: ["patch"]
  - apiGroups: ["storage.k8s.io"]
    resources: ["csinodes"]
    verbs: ["get", "list", "watch"]
  - apiGroups: ["snapshot.storage.k8s.io"]
    resources: ["volumesnapshotcontents/status"]
    verbs: ["update", "patch"]
  - apiGroups: [""]
    resources: ["configmaps"]
    verbs: ["get"]
 ---
 kind: ClusterRoleBinding
 apiVersion: rbac.authorization.k8s.io/v1
 metadata:
  namespace: vitastor-system
  name: vitastor-csi-provisioner-role
 subjects:
  - kind: ServiceAccount
    name: vitastor-csi-provisioner
    namespace: vitastor-system
 roleRef:
  kind: ClusterRole
  name: vitastor-external-provisioner-runner
  apiGroup: rbac.authorization.k8s.io
 ---
 kind: Role
 apiVersion: rbac.authorization.k8s.io/v1
 metadata:
  namespace: vitastor-system
  name: vitastor-external-provisioner-cfg
 rules:
  - apiGroups: [""]
    resources: ["configmaps"]
    verbs: ["get", "list", "watch", "create", "update", "delete"]
  - apiGroups: ["coordination.k8s.io"]
    resources: ["leases"]
    verbs: ["get", "watch", "list", "delete", "update", "create"]
 ---
 kind: RoleBinding
 apiVersion: rbac.authorization.k8s.io/v1
 metadata:
  name: vitastor-csi-provisioner-role-cfg
  namespace: vitastor-system
 subjects:
  - kind: ServiceAccount
    name: vitastor-csi-provisioner
    namespace: vitastor-system
 roleRef:
  kind: Role
  name: vitastor-external-provisioner-cfg
  apiGroup: rbac.authorization.k8s.io
--- a/csi/deploy/006-csi-provisioner-psp.yaml
+++ b/csi/deploy/006-csi-provisioner-psp.yaml
@ -0,0 +1,60 @@
 ---
 apiVersion: policy/v1beta1
 kind: PodSecurityPolicy
 metadata:
  namespace: vitastor-system
  name: vitastor-csi-provisioner-psp
 spec:
  allowPrivilegeEscalation: true
  allowedCapabilities:
    - 'SYS_ADMIN'
  fsGroup:
    rule: RunAsAny
  privileged: true
  runAsUser:
    rule: RunAsAny
  seLinux:
    rule: RunAsAny
  supplementalGroups:
    rule: RunAsAny
  volumes:
    - 'configMap'
    - 'emptyDir'
    - 'projected'
    - 'secret'
    - 'downwardAPI'
    - 'hostPath'
  allowedHostPaths:
    - pathPrefix: '/dev'
      readOnly: false
    - pathPrefix: '/sys'
      readOnly: false
    - pathPrefix: '/lib/modules'
      readOnly: true
 ---
 kind: Role
 apiVersion: rbac.authorization.k8s.io/v1
 metadata:
  namespace: vitastor-system
  name: vitastor-csi-provisioner-psp
 rules:
  - apiGroups: ['policy']
    resources: ['podsecuritypolicies']
    verbs: ['use']
    resourceNames: ['vitastor-csi-provisioner-psp']
 ---
 kind: RoleBinding
 apiVersion: rbac.authorization.k8s.io/v1
 metadata:
  name: vitastor-csi-provisioner-psp
  namespace: vitastor-system
 subjects:
  - kind: ServiceAccount
    name: vitastor-csi-provisioner
    namespace: vitastor-system
 roleRef:
  kind: Role
  name: vitastor-csi-provisioner-psp
  apiGroup: rbac.authorization.k8s.io
--- a/csi/deploy/007-csi-provisioner.yaml
+++ b/csi/deploy/007-csi-provisioner.yaml
@ -0,0 +1,164 @@
 ---
 kind: Service
 apiVersion: v1
 metadata:
  namespace: vitastor-system
  name: csi-vitastor-provisioner
  labels:
    app: csi-metrics
 spec:
  selector:
    app: csi-vitastor-provisioner
  ports:
    - name: http-metrics
      port: 8080
      protocol: TCP
      targetPort: 8680
 ---
 kind: Deployment
 apiVersion: apps/v1
 metadata:
  namespace: vitastor-system
  name: csi-vitastor-provisioner
 spec:
  replicas: 3
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxUnavailable: 1
      maxSurge: 0
  selector:
    matchLabels:
      app: csi-vitastor-provisioner
  template:
    metadata:
      namespace: vitastor-system
      labels:
        app: csi-vitastor-provisioner
    spec:
      affinity:
        podAntiAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            - labelSelector:
                matchExpressions:
                  - key: app
                    operator: In
                    values:
                      - csi-vitastor-provisioner
              topologyKey: "kubernetes.io/hostname"
      serviceAccountName: vitastor-csi-provisioner
      priorityClassName: system-cluster-critical
      containers:
        - name: csi-provisioner
          image: k8s.gcr.io/sig-storage/csi-provisioner:v3.0.0
          args:
            - "--csi-address=$(ADDRESS)"
            - "--v=5"
            - "--timeout=150s"
            - "--retry-interval-start=500ms"
            - "--leader-election=true"
            #  set it to true to use topology based provisioning
            - "--feature-gates=Topology=false"
            # if fstype is not specified in storageclass, ext4 is default
            - "--default-fstype=ext4"
            - "--extra-create-metadata=true"
          env:
            - name: ADDRESS
              value: unix:///csi/csi-provisioner.sock
          imagePullPolicy: "IfNotPresent"
          volumeMounts:
            - name: socket-dir
              mountPath: /csi
        - name: csi-snapshotter
          image: k8s.gcr.io/sig-storage/csi-snapshotter:v4.0.0
          args:
            - "--csi-address=$(ADDRESS)"
            - "--v=5"
            - "--timeout=150s"
            - "--leader-election=true"
          env:
            - name: ADDRESS
              value: unix:///csi/csi-provisioner.sock
          imagePullPolicy: "IfNotPresent"
          securityContext:
            privileged: true
          volumeMounts:
            - name: socket-dir
              mountPath: /csi
        - name: csi-attacher
          image: k8s.gcr.io/sig-storage/csi-attacher:v3.1.0
          args:
            - "--v=5"
            - "--csi-address=$(ADDRESS)"
            - "--leader-election=true"
            - "--retry-interval-start=500ms"
          env:
            - name: ADDRESS
              value: /csi/csi-provisioner.sock
          imagePullPolicy: "IfNotPresent"
          volumeMounts:
            - name: socket-dir
              mountPath: /csi
        - name: csi-resizer
          image: k8s.gcr.io/sig-storage/csi-resizer:v1.1.0
          args:
            - "--csi-address=$(ADDRESS)"
            - "--v=5"
            - "--timeout=150s"
            - "--leader-election"
            - "--retry-interval-start=500ms"
            - "--handle-volume-inuse-error=false"
          env:
            - name: ADDRESS
              value: unix:///csi/csi-provisioner.sock
          imagePullPolicy: "IfNotPresent"
          volumeMounts:
            - name: socket-dir
              mountPath: /csi
        - name: csi-vitastor
          securityContext:
            privileged: true
            capabilities:
              add: ["SYS_ADMIN"]
          image: vitalif/vitastor-csi:v1.6.1
          args:
            - "--node=$(NODE_ID)"
            - "--endpoint=$(CSI_ENDPOINT)"
          env:
            - name: NODE_ID
              valueFrom:
                fieldRef:
                  fieldPath: spec.nodeName
            - name: CSI_ENDPOINT
              value: unix:///csi/csi-provisioner.sock
          imagePullPolicy: "IfNotPresent"
          volumeMounts:
            - name: socket-dir
              mountPath: /csi
            - mountPath: /dev
              name: host-dev
            - mountPath: /sys
              name: host-sys
            - mountPath: /lib/modules
              name: lib-modules
              readOnly: true
            - name: vitastor-config
              mountPath: /etc/vitastor
      volumes:
        - name: host-dev
          hostPath:
            path: /dev
        - name: host-sys
          hostPath:
            path: /sys
        - name: lib-modules
          hostPath:
            path: /lib/modules
        - name: socket-dir
          emptyDir: {
            medium: "Memory"
          }
        - name: vitastor-config
          configMap:
            name: vitastor-config
--- a/csi/deploy/008-csi-driver.yaml
+++ b/csi/deploy/008-csi-driver.yaml
@ -0,0 +1,11 @@
 ---
 # if Kubernetes version is less than 1.18 change
 # apiVersion to storage.k8s.io/v1betav1
 apiVersion: storage.k8s.io/v1
 kind: CSIDriver
 metadata:
  namespace: vitastor-system
  name: csi.vitastor.io
 spec:
  attachRequired: true
  podInfoOnMount: false
--- a/csi/deploy/009-storage-class.yaml
+++ b/csi/deploy/009-storage-class.yaml
@ -0,0 +1,17 @@
 ---
 apiVersion: storage.k8s.io/v1
 kind: StorageClass
 metadata:
  namespace: vitastor-system
  name: vitastor
  annotations:
    storageclass.kubernetes.io/is-default-class: "true"
 provisioner: csi.vitastor.io
 volumeBindingMode: Immediate
 parameters:
  etcdVolumePrefix: ""
  poolId: "1"
  # you can choose other configuration file if you have it in the config map
  # different etcd URLs and prefixes should also be put in the config
  #configPath: "/etc/vitastor/vitastor.conf"
 allowVolumeExpansion: true
--- a/csi/deploy/example-pvc-block.yaml
+++ b/csi/deploy/example-pvc-block.yaml
@ -0,0 +1,13 @@
 ---
 apiVersion: v1
 kind: PersistentVolumeClaim
 metadata:
  name: test-vitastor-pvc-block
 spec:
  storageClassName: vitastor
  volumeMode: Block
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 10Gi
--- a/csi/deploy/example-pvc.yaml
+++ b/csi/deploy/example-pvc.yaml
@ -0,0 +1,12 @@
 ---
 apiVersion: v1
 kind: PersistentVolumeClaim
 metadata:
  name: test-vitastor-pvc
 spec:
  storageClassName: vitastor
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 10Gi
--- a/csi/deploy/example-snapshot-class.yaml
+++ b/csi/deploy/example-snapshot-class.yaml
@ -0,0 +1,7 @@
 apiVersion: snapshot.storage.k8s.io/v1
 kind: VolumeSnapshotClass
 metadata:
  name: vitastor-snapclass
 driver: csi.vitastor.io
 deletionPolicy: Delete
 parameters:
--- a/csi/deploy/example-snapshot-clone.yaml
+++ b/csi/deploy/example-snapshot-clone.yaml
@ -0,0 +1,16 @@
 ---
 apiVersion: v1
 kind: PersistentVolumeClaim
 metadata:
  name: test-vitastor-clone
 spec:
  storageClassName: vitastor
  dataSource:
    name: snap1
    kind: VolumeSnapshot
    apiGroup: snapshot.storage.k8s.io
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 10Gi
--- a/csi/deploy/example-snapshot.yaml
+++ b/csi/deploy/example-snapshot.yaml
@ -0,0 +1,8 @@
 apiVersion: snapshot.storage.k8s.io/v1
 kind: VolumeSnapshot
 metadata:
  name: snap1
 spec:
  volumeSnapshotClassName: vitastor-snapclass
  source:
    persistentVolumeClaimName: test-vitastor-pvc
--- a/csi/deploy/example-test-pod-block.yaml
+++ b/csi/deploy/example-test-pod-block.yaml
@ -0,0 +1,17 @@
 apiVersion: v1
 kind: Pod
 metadata:
  name: vitastor-test-block-pvc
  namespace: default
 spec:
  containers:
  - name: vitastor-test-block-pvc
    image: nginx
    volumeDevices:
      - name: data
        devicePath: /dev/xvda
  volumes:
  - name: data
    persistentVolumeClaim:
      claimName: test-vitastor-pvc-block
      readOnly: false
--- a/csi/deploy/example-test-pod.yaml
+++ b/csi/deploy/example-test-pod.yaml
@ -0,0 +1,17 @@
 apiVersion: v1
 kind: Pod
 metadata:
  name: vitastor-test-nginx
  namespace: default
 spec:
  containers:
   - name: vitastor-test-nginx
     image: nginx
     volumeMounts:
       - mountPath: /usr/share/nginx/html/s3
         name: data
  volumes:
   - name: data
     persistentVolumeClaim:
       claimName: test-vitastor-pvc
       readOnly: false
--- a/csi/go.mod
+++ b/csi/go.mod
@ -0,0 +1,21 @@
 module vitastor.io/csi
 go 1.15
 require (
 	github.com/container-storage-interface/spec v1.4.0
 	github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b
 	github.com/kubernetes-csi/csi-lib-utils v0.9.1
 	golang.org/x/net v0.0.0-20201202161906-c7110b5ffcbb
 	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
 	google.golang.org/grpc v1.33.1
 	google.golang.org/protobuf v1.24.0
 	k8s.io/klog v1.0.0
 	k8s.io/utils v0.0.0-20210305010621-2afb4311ab10
 )
 replace github.com/coreos/bbolt => go.etcd.io/bbolt v1.3.5
 replace go.etcd.io/bbolt => github.com/coreos/bbolt v1.3.5
 replace google.golang.org/grpc => google.golang.org/grpc v1.25.1
--- a/csi/go.sum
+++ b/csi/go.sum
@ -0,0 +1,366 @@
 cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
 cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
 cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
 cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
 cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
 cloud.google.com/go v0.51.0/go.mod h1:hWtGJ6gnXH+KgDv+V0zFGDvpi07n3z8ZNj3T1RW0Gcw=
 cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
 cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
 cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
 cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78/go.mod h1:LmzpDX56iTiv29bbRTIsUNlaFfuhWRQBWjQdVyAevI8=
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 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
 github.com/blang/semver v3.5.0+incompatible/go.mod h1:kRBLl5iJ+tD4TcOOxsy/0fnwebNt5EWlYSAyrTnjyyk=
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
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 github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
 github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
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 github.com/docopt/docopt-go v0.0.0-20180111231733-ee0de3bc6815/go.mod h1:WwZ+bS3ebgob9U8Nd0kOddGdZWjyMGR8Wziv+TBNwSE=
 github.com/elazarl/goproxy v0.0.0-20180725130230-947c36da3153/go.mod h1:/Zj4wYkgs4iZTTu3o/KG3Itv/qCCa8VVMlb3i9OVuzc=
 github.com/emicklei/go-restful v0.0.0-20170410110728-ff4f55a20633/go.mod h1:otzb+WCGbkyDHkqmQmT5YD2WR4BBwUdeQoFo8l/7tVs=
 github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
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 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20191125211704-12ad95a8df72/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
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 github.com/go-kit/kit v0.9.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
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 github.com/go-logr/logr v0.1.0/go.mod h1:ixOQHD9gLJUVQQ2ZOR7zLEifBX6tGkNJF4QyIY7sIas=
 github.com/go-logr/logr v0.2.0 h1:QvGt2nLcHH0WK9orKa+ppBPAxREcH364nPUedEpK0TY=
 github.com/go-logr/logr v0.2.0/go.mod h1:z6/tIYblkpsD+a4lm/fGIIU9mZ+XfAiaFtq7xTgseGU=
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 github.com/golang/groupcache v0.0.0-20191227052852-215e87163ea7/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
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 github.com/golang/mock v1.3.1/go.mod h1:sBzyDLLjw3U8JLTeZvSv8jJB+tU5PVekmnlKIyFUx0Y=
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.3/go.mod h1:vzj43D7+SQXF/4pzW/hwtAqwc6iTitCiVSaWz5lYuqw=
 github.com/golang/protobuf v1.4.0-rc.1/go.mod h1:ceaxUfeHdC40wWswd/P6IGgMaK3YpKi5j83Wpe3EHw8=
 github.com/golang/protobuf v1.4.0-rc.1.0.20200221234624-67d41d38c208/go.mod h1:xKAWHe0F5eneWXFV3EuXVDTCmh+JuBKY0li0aMyXATA=
 github.com/golang/protobuf v1.4.0-rc.2/go.mod h1:LlEzMj4AhA7rCAGe4KMBDvJI+AwstrUpVNzEA03Pprs=
 github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:WU3c8KckQ9AFe+yFwt9sWVRKCVIyN9cPHBJSNnbL67w=
 github.com/golang/protobuf v1.4.0/go.mod h1:jodUvKwWbYaEsadDk5Fwe5c77LiNKVO9IDvqG2KuDX0=
 github.com/golang/protobuf v1.4.1/go.mod h1:U8fpvMrcmy5pZrNK1lt4xCsGvpyWQ/VVv6QDs8UjoX8=
 github.com/golang/protobuf v1.4.2 h1:+Z5KGCizgyZCbGh1KZqA0fcLLkwbsjIzS4aV2v7wJX0=
 github.com/golang/protobuf v1.4.2/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
 github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
 github.com/google/btree v1.0.0/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
 github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
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 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
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 k8s.io/apimachinery v0.19.0/go.mod h1:DnPGDnARWFvYa3pMHgSxtbZb7gpzzAZ1pTfaUNDVlmA=
 k8s.io/client-go v0.19.0/go.mod h1:H9E/VT95blcFQnlyShFgnFT9ZnJOAceiUHM3MlRC+mU=
 k8s.io/component-base v0.19.0/go.mod h1:dKsY8BxkA+9dZIAh2aWJLL/UdASFDNtGYTCItL4LM7Y=
 k8s.io/gengo v0.0.0-20200413195148-3a45101e95ac/go.mod h1:ezvh/TsK7cY6rbqRK0oQQ8IAqLxYwwyPxAX1Pzy0ii0=
 k8s.io/klog v1.0.0 h1:Pt+yjF5aB1xDSVbau4VsWe+dQNzA0qv1LlXdC2dF6Q8=
 k8s.io/klog v1.0.0/go.mod h1:4Bi6QPql/J/LkTDqv7R/cd3hPo4k2DG6Ptcz060Ez5I=
 k8s.io/klog/v2 v2.0.0/go.mod h1:PBfzABfn139FHAV07az/IF9Wp1bkk3vpT2XSJ76fSDE=
 k8s.io/klog/v2 v2.2.0 h1:XRvcwJozkgZ1UQJmfMGpvRthQHOvihEhYtDfAaxMz/A=
 k8s.io/klog/v2 v2.2.0/go.mod h1:Od+F08eJP+W3HUb4pSrPpgp9DGU4GzlpG/TmITuYh/Y=
 k8s.io/kube-openapi v0.0.0-20200805222855-6aeccd4b50c6/go.mod h1:UuqjUnNftUyPE5H64/qeyjQoUZhGpeFDVdxjTeEVN2o=
 k8s.io/utils v0.0.0-20200729134348-d5654de09c73/go.mod h1:jPW/WVKK9YHAvNhRxK0md/EJ228hCsBRufyofKtW8HA=
 k8s.io/utils v0.0.0-20210305010621-2afb4311ab10 h1:u5rPykqiCpL+LBfjRkXvnK71gOgIdmq3eHUEkPrbeTI=
 k8s.io/utils v0.0.0-20210305010621-2afb4311ab10/go.mod h1:jPW/WVKK9YHAvNhRxK0md/EJ228hCsBRufyofKtW8HA=
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--- a/csi/src/config.go
+++ b/csi/src/config.go
@ -0,0 +1,22 @@
 // Copyright (c) Vitaliy Filippov, 2019+
 // License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
 package vitastor
 const (
    vitastorCSIDriverName    = "csi.vitastor.io"
    vitastorCSIDriverVersion = "1.6.1"
 )
 // Config struct fills the parameters of request or user input
 type Config struct
 {
    Endpoint string
    NodeID   string
 }
 // NewConfig returns config struct to initialize new driver
 func NewConfig() *Config
 {
    return &Config{}
 }
--- a/csi/src/controllerserver.go
+++ b/csi/src/controllerserver.go
@ -0,0 +1,605 @@
 // Copyright (c) Vitaliy Filippov, 2019+
 // License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
 package vitastor
 import (
    "context"
    "encoding/json"
    "fmt"
    "strings"
    "bytes"
    "strconv"
    "time"
    "os"
    "os/exec"
    "io/ioutil"
    "github.com/kubernetes-csi/csi-lib-utils/protosanitizer"
    "k8s.io/klog"
    "google.golang.org/grpc/codes"
    "google.golang.org/grpc/status"
    "google.golang.org/protobuf/types/known/timestamppb"
    "github.com/container-storage-interface/spec/lib/go/csi"
 )
 const (
    KB int64 = 1024
    MB int64 = 1024 * KB
    GB int64 = 1024 * MB
    TB int64 = 1024 * GB
    ETCD_TIMEOUT time.Duration = 15*time.Second
 )
 type InodeIndex struct
 {
    Id uint64 `json:"id"`
    PoolId uint64 `json:"pool_id"`
 }
 type InodeConfig struct
 {
    Name string `json:"name"`
    Size uint64 `json:"size,omitempty"`
    ParentPool uint64 `json:"parent_pool,omitempty"`
    ParentId uint64 `json:"parent_id,omitempty"`
    Readonly bool `json:"readonly,omitempty"`
    CreateTs uint64 `json:"create_ts,omitempty"`
 }
 type ControllerServer struct
 {
    *Driver
 }
 // NewControllerServer create new instance controller
 func NewControllerServer(driver *Driver) *ControllerServer
 {
    return &ControllerServer{
        Driver: driver,
    }
 }
 func GetConnectionParams(params map[string]string) (map[string]string, error)
 {
    ctxVars := make(map[string]string)
    configPath := params["configPath"]
    if (configPath == "")
    {
        configPath = "/etc/vitastor/vitastor.conf"
    }
    else
    {
        ctxVars["configPath"] = configPath
    }
    config := make(map[string]interface{})
    configFD, err := os.Open(configPath)
    if (err != nil)
    {
        return nil, err
    }
    defer configFD.Close()
    data, _ := ioutil.ReadAll(configFD)
    json.Unmarshal(data, &config)
    // Check etcd URL in the config, but do not use the explicit etcdUrl
    // parameter for CLI calls, otherwise users won't be able to later
    // change them - storage class parameters are saved in volume IDs
    var etcdUrl []string
    switch config["etcd_address"].(type)
    {
    case string:
        url := strings.TrimSpace(config["etcd_address"].(string))
        if (url != "")
        {
            etcdUrl = strings.Split(url, ",")
        }
    case []string:
        etcdUrl = config["etcd_address"].([]string)
    case []interface{}:
        for _, url := range config["etcd_address"].([]interface{})
        {
            s, ok := url.(string)
            if (ok)
            {
                etcdUrl = append(etcdUrl, s)
            }
        }
    }
    if (len(etcdUrl) == 0)
    {
        return nil, status.Error(codes.InvalidArgument, "etcd_address is missing in "+configPath)
    }
    return ctxVars, nil
 }
 func system(program string, args ...string) ([]byte, []byte, error)
 {
    klog.Infof("Running "+program+" "+strings.Join(args, " "))
    c := exec.Command(program, args...)
    var stdout, stderr bytes.Buffer
    c.Stdout, c.Stderr = &stdout, &stderr
    err := c.Run()
    if (err != nil)
    {
        stdoutStr, stderrStr := string(stdout.Bytes()), string(stderr.Bytes())
        klog.Errorf(program+" "+strings.Join(args, " ")+" failed: %s, status %s\n", stdoutStr+stderrStr, err)
        return nil, nil, status.Error(codes.Internal, stdoutStr+stderrStr+" (status "+err.Error()+")")
    }
    return stdout.Bytes(), stderr.Bytes(), nil
 }
 func invokeCLI(ctxVars map[string]string, args []string) ([]byte, error)
 {
    if (ctxVars["configPath"] != "")
    {
        args = append(args, "--config_path", ctxVars["configPath"])
    }
    stdout, _, err := system("/usr/bin/vitastor-cli", args...)
    return stdout, err
 }
 // Create the volume
 func (cs *ControllerServer) CreateVolume(ctx context.Context, req *csi.CreateVolumeRequest) (*csi.CreateVolumeResponse, error)
 {
    klog.Infof("received controller create volume request %+v", protosanitizer.StripSecrets(req))
    if (req == nil)
    {
        return nil, status.Errorf(codes.InvalidArgument, "request cannot be empty")
    }
    if (req.GetName() == "")
    {
        return nil, status.Error(codes.InvalidArgument, "name is a required field")
    }
    volumeCapabilities := req.GetVolumeCapabilities()
    if (volumeCapabilities == nil)
    {
        return nil, status.Error(codes.InvalidArgument, "volume capabilities is a required field")
    }
    etcdVolumePrefix := req.Parameters["etcdVolumePrefix"]
    poolId, _ := strconv.ParseUint(req.Parameters["poolId"], 10, 64)
    if (poolId == 0)
    {
        return nil, status.Error(codes.InvalidArgument, "poolId is missing in storage class configuration")
    }
    volName := etcdVolumePrefix + req.GetName()
    volSize := 1 * GB
    if capRange := req.GetCapacityRange(); capRange != nil
    {
        volSize = ((capRange.GetRequiredBytes() + MB - 1) / MB) * MB
    }
    ctxVars, err := GetConnectionParams(req.Parameters)
    if (err != nil)
    {
        return nil, err
    }
    args := []string{ "create", volName, "-s", fmt.Sprintf("%v", volSize), "--pool", fmt.Sprintf("%v", poolId) }
    // Support creation from snapshot
    var src *csi.VolumeContentSource
    if (req.VolumeContentSource.GetSnapshot() != nil)
    {
        snapId := req.VolumeContentSource.GetSnapshot().GetSnapshotId()
        if (snapId != "")
        {
            snapVars := make(map[string]string)
            err := json.Unmarshal([]byte(snapId), &snapVars)
            if (err != nil)
            {
                return nil, status.Error(codes.Internal, "volume ID not in JSON format")
            }
            args = append(args, "--parent", snapVars["name"]+"@"+snapVars["snapshot"])
            src = &csi.VolumeContentSource{
                Type: &csi.VolumeContentSource_Snapshot{
                    Snapshot: &csi.VolumeContentSource_SnapshotSource{
                        SnapshotId: snapId,
                    },
                },
            }
        }
    }
    // Create image using vitastor-cli
    _, err = invokeCLI(ctxVars, args)
    if (err != nil)
    {
        if (strings.Index(err.Error(), "already exists") > 0)
        {
            inodeCfg, err := invokeList(ctxVars, volName, true)
            if (err != nil)
            {
                return nil, err
            }
            if (inodeCfg[0].Size < uint64(volSize))
            {
                return nil, status.Error(codes.Internal, "image "+volName+" is already created, but size is less than expected")
            }
        }
        else
        {
            return nil, err
        }
    }
    ctxVars["name"] = volName
    volumeIdJson, _ := json.Marshal(ctxVars)
    return &csi.CreateVolumeResponse{
        Volume: &csi.Volume{
            // Ugly, but VolumeContext isn't passed to DeleteVolume :-(
            VolumeId: string(volumeIdJson),
            CapacityBytes: volSize,
            ContentSource: src,
        },
    }, nil
 }
 // DeleteVolume deletes the given volume
 func (cs *ControllerServer) DeleteVolume(ctx context.Context, req *csi.DeleteVolumeRequest) (*csi.DeleteVolumeResponse, error)
 {
    klog.Infof("received controller delete volume request %+v", protosanitizer.StripSecrets(req))
    if (req == nil)
    {
        return nil, status.Error(codes.InvalidArgument, "request cannot be empty")
    }
    volVars := make(map[string]string)
    err := json.Unmarshal([]byte(req.VolumeId), &volVars)
    if (err != nil)
    {
        return nil, status.Error(codes.Internal, "volume ID not in JSON format")
    }
    volName := volVars["name"]
    ctxVars, err := GetConnectionParams(volVars)
    if (err != nil)
    {
        return nil, err
    }
    _, err = invokeCLI(ctxVars, []string{ "rm", volName })
    if (err != nil)
    {
        return nil, err
    }
    return &csi.DeleteVolumeResponse{}, nil
 }
 // ControllerPublishVolume return Unimplemented error
 func (cs *ControllerServer) ControllerPublishVolume(ctx context.Context, req *csi.ControllerPublishVolumeRequest) (*csi.ControllerPublishVolumeResponse, error)
 {
    return nil, status.Error(codes.Unimplemented, "")
 }
 // ControllerUnpublishVolume return Unimplemented error
 func (cs *ControllerServer) ControllerUnpublishVolume(ctx context.Context, req *csi.ControllerUnpublishVolumeRequest) (*csi.ControllerUnpublishVolumeResponse, error)
 {
    return nil, status.Error(codes.Unimplemented, "")
 }
 // ValidateVolumeCapabilities checks whether the volume capabilities requested are supported.
 func (cs *ControllerServer) ValidateVolumeCapabilities(ctx context.Context, req *csi.ValidateVolumeCapabilitiesRequest) (*csi.ValidateVolumeCapabilitiesResponse, error)
 {
    klog.Infof("received controller validate volume capability request %+v", protosanitizer.StripSecrets(req))
    if (req == nil)
    {
        return nil, status.Errorf(codes.InvalidArgument, "request is nil")
    }
    volumeID := req.GetVolumeId()
    if (volumeID == "")
    {
        return nil, status.Error(codes.InvalidArgument, "volumeId is nil")
    }
    volumeCapabilities := req.GetVolumeCapabilities()
    if (volumeCapabilities == nil)
    {
        return nil, status.Error(codes.InvalidArgument, "volumeCapabilities is nil")
    }
    var volumeCapabilityAccessModes []*csi.VolumeCapability_AccessMode
    for _, mode := range []csi.VolumeCapability_AccessMode_Mode{
        csi.VolumeCapability_AccessMode_SINGLE_NODE_WRITER,
        csi.VolumeCapability_AccessMode_MULTI_NODE_MULTI_WRITER,
    } {
        volumeCapabilityAccessModes = append(volumeCapabilityAccessModes, &csi.VolumeCapability_AccessMode{Mode: mode})
    }
    capabilitySupport := false
    for _, capability := range volumeCapabilities
    {
        for _, volumeCapabilityAccessMode := range volumeCapabilityAccessModes
        {
            if (volumeCapabilityAccessMode.Mode == capability.AccessMode.Mode)
            {
                capabilitySupport = true
            }
        }
    }
    if (!capabilitySupport)
    {
        return nil, status.Errorf(codes.NotFound, "%v not supported", req.GetVolumeCapabilities())
    }
    return &csi.ValidateVolumeCapabilitiesResponse{
        Confirmed: &csi.ValidateVolumeCapabilitiesResponse_Confirmed{
            VolumeCapabilities: req.VolumeCapabilities,
        },
    }, nil
 }
 // ListVolumes returns a list of volumes
 func (cs *ControllerServer) ListVolumes(ctx context.Context, req *csi.ListVolumesRequest) (*csi.ListVolumesResponse, error)
 {
    return nil, status.Error(codes.Unimplemented, "")
 }
 // GetCapacity returns the capacity of the storage pool
 func (cs *ControllerServer) GetCapacity(ctx context.Context, req *csi.GetCapacityRequest) (*csi.GetCapacityResponse, error)
 {
    return nil, status.Error(codes.Unimplemented, "")
 }
 // ControllerGetCapabilities returns the capabilities of the controller service.
 func (cs *ControllerServer) ControllerGetCapabilities(ctx context.Context, req *csi.ControllerGetCapabilitiesRequest) (*csi.ControllerGetCapabilitiesResponse, error)
 {
    functionControllerServerCapabilities := func(cap csi.ControllerServiceCapability_RPC_Type) *csi.ControllerServiceCapability
    {
        return &csi.ControllerServiceCapability{
            Type: &csi.ControllerServiceCapability_Rpc{
                Rpc: &csi.ControllerServiceCapability_RPC{
                    Type: cap,
                },
            },
        }
    }
    var controllerServerCapabilities []*csi.ControllerServiceCapability
    for _, capability := range []csi.ControllerServiceCapability_RPC_Type{
        csi.ControllerServiceCapability_RPC_CREATE_DELETE_VOLUME,
        csi.ControllerServiceCapability_RPC_LIST_VOLUMES,
        csi.ControllerServiceCapability_RPC_EXPAND_VOLUME,
        csi.ControllerServiceCapability_RPC_CREATE_DELETE_SNAPSHOT,
        csi.ControllerServiceCapability_RPC_LIST_SNAPSHOTS,
        // TODO: csi.ControllerServiceCapability_RPC_CLONE_VOLUME,
    } {
        controllerServerCapabilities = append(controllerServerCapabilities, functionControllerServerCapabilities(capability))
    }
    return &csi.ControllerGetCapabilitiesResponse{
        Capabilities: controllerServerCapabilities,
    }, nil
 }
 func invokeList(ctxVars map[string]string, pattern string, expectExist bool) ([]InodeConfig, error)
 {
    stat, err := invokeCLI(ctxVars, []string{ "ls", "--json", pattern })
    if (err != nil)
    {
        return nil, err
    }
    var inodeCfg []InodeConfig
    err = json.Unmarshal(stat, &inodeCfg)
    if (err != nil)
    {
        return nil, status.Error(codes.Internal, "Invalid JSON in vitastor-cli ls: "+err.Error())
    }
    if (expectExist && len(inodeCfg) == 0)
    {
        return nil, status.Error(codes.Internal, "Can't find expected image "+pattern+" via vitastor-cli ls")
    }
    return inodeCfg, nil
 }
 // CreateSnapshot create snapshot of an existing PV
 func (cs *ControllerServer) CreateSnapshot(ctx context.Context, req *csi.CreateSnapshotRequest) (*csi.CreateSnapshotResponse, error)
 {
    klog.Infof("received controller create snapshot request %+v", protosanitizer.StripSecrets(req))
    if (req == nil)
    {
        return nil, status.Errorf(codes.InvalidArgument, "request cannot be empty")
    }
    if (req.SourceVolumeId == "" || req.Name == "")
    {
        return nil, status.Error(codes.InvalidArgument, "source volume ID and snapshot name are required fields")
    }
    // snapshot name
    snapName := req.Name
    // req.VolumeId is an ugly json string in our case :)
    ctxVars := make(map[string]string)
    err := json.Unmarshal([]byte(req.SourceVolumeId), &ctxVars)
    if (err != nil)
    {
        return nil, status.Error(codes.Internal, "volume ID not in JSON format")
    }
    volName := ctxVars["name"]
    // Create image using vitastor-cli
    _, err = invokeCLI(ctxVars, []string{ "create", "--snapshot", snapName, volName })
    if (err != nil && strings.Index(err.Error(), "already exists") <= 0)
    {
        return nil, err
    }
    // Check created snapshot
    inodeCfg, err := invokeList(ctxVars, volName+"@"+snapName, true)
    if (err != nil)
    {
        return nil, err
    }
    // Use ugly JSON snapshot ID again, DeleteSnapshot doesn't have context :-(
    ctxVars["snapshot"] = snapName
    snapIdJson, _ := json.Marshal(ctxVars)
    return &csi.CreateSnapshotResponse{
        Snapshot: &csi.Snapshot{
            SizeBytes: int64(inodeCfg[0].Size),
            SnapshotId: string(snapIdJson),
            SourceVolumeId: req.SourceVolumeId,
            CreationTime: &timestamppb.Timestamp{ Seconds: int64(inodeCfg[0].CreateTs) },
            ReadyToUse: true,
        },
    }, nil
 }
 // DeleteSnapshot delete provided snapshot of a PV
 func (cs *ControllerServer) DeleteSnapshot(ctx context.Context, req *csi.DeleteSnapshotRequest) (*csi.DeleteSnapshotResponse, error)
 {
    klog.Infof("received controller delete snapshot request %+v", protosanitizer.StripSecrets(req))
    if (req == nil)
    {
        return nil, status.Errorf(codes.InvalidArgument, "request cannot be empty")
    }
    if (req.SnapshotId == "")
    {
        return nil, status.Error(codes.InvalidArgument, "snapshot ID is a required field")
    }
    volVars := make(map[string]string)
    err := json.Unmarshal([]byte(req.SnapshotId), &volVars)
    if (err != nil)
    {
        return nil, status.Error(codes.Internal, "snapshot ID not in JSON format")
    }
    volName := volVars["name"]
    snapName := volVars["snapshot"]
    ctxVars, err := GetConnectionParams(volVars)
    if (err != nil)
    {
        return nil, err
    }
    _, err = invokeCLI(ctxVars, []string{ "rm", volName+"@"+snapName })
    if (err != nil)
    {
        return nil, err
    }
    return &csi.DeleteSnapshotResponse{}, nil
 }
 // ListSnapshots list the snapshots of a PV
 func (cs *ControllerServer) ListSnapshots(ctx context.Context, req *csi.ListSnapshotsRequest) (*csi.ListSnapshotsResponse, error)
 {
    klog.Infof("received controller list snapshots request %+v", protosanitizer.StripSecrets(req))
    if (req == nil)
    {
        return nil, status.Error(codes.InvalidArgument, "request cannot be empty")
    }
    volVars := make(map[string]string)
    err := json.Unmarshal([]byte(req.SourceVolumeId), &volVars)
    if (err != nil)
    {
        return nil, status.Error(codes.Internal, "volume ID not in JSON format")
    }
    volName := volVars["name"]
    ctxVars, err := GetConnectionParams(volVars)
    if (err != nil)
    {
        return nil, err
    }
    inodeCfg, err := invokeList(ctxVars, volName+"@*", false)
    if (err != nil)
    {
        return nil, err
    }
    resp := &csi.ListSnapshotsResponse{}
    for _, ino := range inodeCfg
    {
        snapName := ino.Name[len(volName)+1:]
        if (len(req.StartingToken) > 0 && snapName < req.StartingToken)
        {
        }
        else if (req.MaxEntries == 0 || len(resp.Entries) < int(req.MaxEntries))
        {
            volVars["snapshot"] = snapName
            snapIdJson, _ := json.Marshal(volVars)
            resp.Entries = append(resp.Entries, &csi.ListSnapshotsResponse_Entry{
                Snapshot: &csi.Snapshot{
                    SizeBytes: int64(ino.Size),
                    SnapshotId: string(snapIdJson),
                    SourceVolumeId: req.SourceVolumeId,
                    CreationTime: &timestamppb.Timestamp{ Seconds: int64(ino.CreateTs) },
                    ReadyToUse: true,
                },
            })
        }
        else
        {
            resp.NextToken = snapName
            break
        }
    }
    return resp, nil
 }
 // ControllerExpandVolume increases the size of a volume
 func (cs *ControllerServer) ControllerExpandVolume(ctx context.Context, req *csi.ControllerExpandVolumeRequest) (*csi.ControllerExpandVolumeResponse, error)
 {
    klog.Infof("received controller expand volume request %+v", protosanitizer.StripSecrets(req))
    if (req == nil)
    {
        return nil, status.Error(codes.InvalidArgument, "request cannot be empty")
    }
    if (req.VolumeId == "" || req.CapacityRange == nil || req.CapacityRange.RequiredBytes == 0)
    {
        return nil, status.Error(codes.InvalidArgument, "VolumeId, CapacityRange and RequiredBytes are required fields")
    }
    volVars := make(map[string]string)
    err := json.Unmarshal([]byte(req.VolumeId), &volVars)
    if (err != nil)
    {
        return nil, status.Error(codes.Internal, "volume ID not in JSON format")
    }
    volName := volVars["name"]
    ctxVars, err := GetConnectionParams(volVars)
    if (err != nil)
    {
        return nil, err
    }
    inodeCfg, err := invokeList(ctxVars, volName, true)
    if (err != nil)
    {
        return nil, err
    }
    if (req.CapacityRange.RequiredBytes > 0 && inodeCfg[0].Size < uint64(req.CapacityRange.RequiredBytes))
    {
        sz := ((req.CapacityRange.RequiredBytes+4095)/4096)*4096
        _, err := invokeCLI(ctxVars, []string{ "modify", "--inc_size", "1", "--resize", fmt.Sprintf("%d", sz), volName })
        if (err != nil)
        {
            return nil, err
        }
        inodeCfg, err = invokeList(ctxVars, volName, true)
        if (err != nil)
        {
            return nil, err
        }
    }
    return &csi.ControllerExpandVolumeResponse{
        CapacityBytes: int64(inodeCfg[0].Size),
        NodeExpansionRequired: false,
    }, nil
 }
 // ControllerGetVolume get volume info
 func (cs *ControllerServer) ControllerGetVolume(ctx context.Context, req *csi.ControllerGetVolumeRequest) (*csi.ControllerGetVolumeResponse, error)
 {
    return nil, status.Error(codes.Unimplemented, "")
 }
--- a/csi/src/grpc.go
+++ b/csi/src/grpc.go
@ -0,0 +1,137 @@
 /*
 Copyright 2017 The Kubernetes Authors.
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at
    http://www.apache.org/licenses/LICENSE-2.0
 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */
 package vitastor
 import (
    "fmt"
    "net"
    "os"
    "strings"
    "sync"
    "github.com/golang/glog"
    "golang.org/x/net/context"
    "google.golang.org/grpc"
    "github.com/container-storage-interface/spec/lib/go/csi"
    "github.com/kubernetes-csi/csi-lib-utils/protosanitizer"
 )
 // Defines Non blocking GRPC server interfaces
 type NonBlockingGRPCServer interface {
    // Start services at the endpoint
    Start(endpoint string, ids csi.IdentityServer, cs csi.ControllerServer, ns csi.NodeServer)
    // Waits for the service to stop
    Wait()
    // Stops the service gracefully
    Stop()
    // Stops the service forcefully
    ForceStop()
 }
 func NewNonBlockingGRPCServer() NonBlockingGRPCServer {
    return &nonBlockingGRPCServer{}
 }
 // NonBlocking server
 type nonBlockingGRPCServer struct {
    wg     sync.WaitGroup
    server *grpc.Server
 }
 func (s *nonBlockingGRPCServer) Start(endpoint string, ids csi.IdentityServer, cs csi.ControllerServer, ns csi.NodeServer) {
    s.wg.Add(1)
    go s.serve(endpoint, ids, cs, ns)
    return
 }
 func (s *nonBlockingGRPCServer) Wait() {
    s.wg.Wait()
 }
 func (s *nonBlockingGRPCServer) Stop() {
    s.server.GracefulStop()
 }
 func (s *nonBlockingGRPCServer) ForceStop() {
    s.server.Stop()
 }
 func (s *nonBlockingGRPCServer) serve(endpoint string, ids csi.IdentityServer, cs csi.ControllerServer, ns csi.NodeServer) {
    proto, addr, err := ParseEndpoint(endpoint)
    if err != nil {
        glog.Fatal(err.Error())
    }
    if proto == "unix" {
        addr = "/" + addr
        if err := os.Remove(addr); err != nil && !os.IsNotExist(err) {
            glog.Fatalf("Failed to remove %s, error: %s", addr, err.Error())
        }
    }
    listener, err := net.Listen(proto, addr)
    if err != nil {
        glog.Fatalf("Failed to listen: %v", err)
    }
    opts := []grpc.ServerOption{
        grpc.UnaryInterceptor(logGRPC),
    }
    server := grpc.NewServer(opts...)
    s.server = server
    if ids != nil {
        csi.RegisterIdentityServer(server, ids)
    }
    if cs != nil {
        csi.RegisterControllerServer(server, cs)
    }
    if ns != nil {
        csi.RegisterNodeServer(server, ns)
    }
    glog.Infof("Listening for connections on address: %#v", listener.Addr())
    server.Serve(listener)
 }
 func ParseEndpoint(ep string) (string, string, error) {
    if strings.HasPrefix(strings.ToLower(ep), "unix://") || strings.HasPrefix(strings.ToLower(ep), "tcp://") {
        s := strings.SplitN(ep, "://", 2)
        if s[1] != "" {
            return s[0], s[1], nil
        }
    }
    return "", "", fmt.Errorf("Invalid endpoint: %v", ep)
 }
 func logGRPC(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
    glog.V(3).Infof("GRPC call: %s", info.FullMethod)
    glog.V(5).Infof("GRPC request: %s", protosanitizer.StripSecrets(req))
    resp, err := handler(ctx, req)
    if err != nil {
        glog.Errorf("GRPC error: %v", err)
    } else {
        glog.V(5).Infof("GRPC response: %s", protosanitizer.StripSecrets(resp))
    }
    return resp, err
 }
--- a/csi/src/identityserver.go
+++ b/csi/src/identityserver.go
@ -0,0 +1,67 @@
 // Copyright (c) Vitaliy Filippov, 2019+
 // License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
 package vitastor
 import (
    "context"
    "github.com/kubernetes-csi/csi-lib-utils/protosanitizer"
    "k8s.io/klog"
    "github.com/container-storage-interface/spec/lib/go/csi"
 )
 // IdentityServer struct of Vitastor CSI driver with supported methods of CSI identity server spec.
 type IdentityServer struct
 {
    *Driver
 }
 // NewIdentityServer create new instance identity
 func NewIdentityServer(driver *Driver) *IdentityServer
 {
    return &IdentityServer{
        Driver: driver,
    }
 }
 // GetPluginInfo returns metadata of the plugin
 func (is *IdentityServer) GetPluginInfo(ctx context.Context, req *csi.GetPluginInfoRequest) (*csi.GetPluginInfoResponse, error)
 {
    klog.Infof("received identity plugin info request %+v", protosanitizer.StripSecrets(req))
    return &csi.GetPluginInfoResponse{
        Name:          vitastorCSIDriverName,
        VendorVersion: vitastorCSIDriverVersion,
    }, nil
 }
 // GetPluginCapabilities returns available capabilities of the plugin
 func (is *IdentityServer) GetPluginCapabilities(ctx context.Context, req *csi.GetPluginCapabilitiesRequest) (*csi.GetPluginCapabilitiesResponse, error)
 {
    klog.Infof("received identity plugin capabilities request %+v", protosanitizer.StripSecrets(req))
    return &csi.GetPluginCapabilitiesResponse{
        Capabilities: []*csi.PluginCapability{
            {
                Type: &csi.PluginCapability_Service_{
                    Service: &csi.PluginCapability_Service{
                        Type: csi.PluginCapability_Service_CONTROLLER_SERVICE,
                    },
                },
            },
            {
                Type: &csi.PluginCapability_VolumeExpansion_{
                    VolumeExpansion: &csi.PluginCapability_VolumeExpansion{
                        Type: csi.PluginCapability_VolumeExpansion_OFFLINE,
                    },
                },
            },
        },
    }, nil
 }
 // Probe returns the health and readiness of the plugin
 func (is *IdentityServer) Probe(ctx context.Context, req *csi.ProbeRequest) (*csi.ProbeResponse, error)
 {
    return &csi.ProbeResponse{}, nil
 }
--- a/csi/src/nodeserver.go
+++ b/csi/src/nodeserver.go
@ -0,0 +1,594 @@
 // Copyright (c) Vitaliy Filippov, 2019+
 // License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
 package vitastor
 import (
    "context"
    "encoding/json"
    "fmt"
    "os"
    "os/exec"
    "path/filepath"
    "strings"
    "sync"
    "syscall"
    "time"
    "google.golang.org/grpc/codes"
    "google.golang.org/grpc/status"
    "k8s.io/utils/mount"
    utilexec "k8s.io/utils/exec"
    "github.com/container-storage-interface/spec/lib/go/csi"
    "github.com/kubernetes-csi/csi-lib-utils/protosanitizer"
    "k8s.io/klog"
 )
 // NodeServer struct of Vitastor CSI driver with supported methods of CSI node server spec.
 type NodeServer struct
 {
    *Driver
    useVduse bool
    stateDir string
    mounter mount.Interface
    restartInterval time.Duration
    mu sync.Mutex
    cond *sync.Cond
    volumeLocks map[string]bool
 }
 type DeviceState struct
 {
    ConfigPath string `json:"configPath"`
    VdpaId     string `json:"vdpaId"`
    Image      string `json:"image"`
    Blockdev   string `json:"blockdev"`
    Readonly   bool   `json:"readonly"`
    PidFile    string `json:"pidFile"`
 }
 // NewNodeServer create new instance node
 func NewNodeServer(driver *Driver) *NodeServer
 {
    stateDir := os.Getenv("STATE_DIR")
    if (stateDir == "")
    {
        stateDir = "/run/vitastor-csi"
    }
    if (stateDir[len(stateDir)-1] != '/')
    {
        stateDir += "/"
    }
    ns := &NodeServer{
        Driver: driver,
        useVduse: checkVduseSupport(),
        stateDir: stateDir,
        mounter: mount.New(""),
        volumeLocks: make(map[string]bool),
    }
    ns.cond = sync.NewCond(&ns.mu)
    if (ns.useVduse)
    {
        ns.restoreVduseDaemons()
        dur, err := time.ParseDuration(os.Getenv("RESTART_INTERVAL"))
        if (err != nil)
        {
            dur = 10 * time.Second
        }
        ns.restartInterval = dur
        if (ns.restartInterval != time.Duration(0))
        {
            go ns.restarter()
        }
    }
    return ns
 }
 func (ns *NodeServer) lockVolume(lockId string)
 {
    ns.mu.Lock()
    defer ns.mu.Unlock()
    for (ns.volumeLocks[lockId])
    {
        ns.cond.Wait()
    }
    ns.volumeLocks[lockId] = true
    ns.cond.Broadcast()
 }
 func (ns *NodeServer) unlockVolume(lockId string)
 {
    ns.mu.Lock()
    defer ns.mu.Unlock()
    delete(ns.volumeLocks, lockId)
    ns.cond.Broadcast()
 }
 func (ns *NodeServer) restarter()
 {
    // Restart dead VDUSE daemons at regular intervals
    // Otherwise volume I/O may hang in case of a qemu-storage-daemon crash
    // Moreover, it may lead to a kernel panic of the kernel is configured to
    // panic on hung tasks
    ticker := time.NewTicker(ns.restartInterval)
    defer ticker.Stop()
    for
    {
        <-ticker.C
        ns.restoreVduseDaemons()
    }
 }
 func (ns *NodeServer) restoreVduseDaemons()
 {
    pattern := ns.stateDir+"vitastor-vduse-*.json"
    matches, err := filepath.Glob(pattern)
    if (err != nil)
    {
        klog.Errorf("failed to list %s: %v", pattern, err)
    }
    if (len(matches) == 0)
    {
        return
    }
    devList := make(map[string]interface{})
    // example output: {"dev":{"test1":{"type":"block","mgmtdev":"vduse","vendor_id":0,"max_vqs":16,"max_vq_size":128}}}
    devListJSON, _, err := system("/sbin/vdpa", "-j", "dev", "list")
    if (err != nil)
    {
        return
    }
    err = json.Unmarshal(devListJSON, &devList)
    devs, ok := devList["dev"].(map[string]interface{})
    if (err != nil || !ok)
    {
        klog.Errorf("/sbin/vdpa -j dev list returned bad JSON (error %v): %v", err, string(devListJSON))
        return
    }
    for _, stateFile := range matches
    {
        vdpaId := filepath.Base(stateFile)
        vdpaId = vdpaId[0:len(vdpaId)-5]
        // Check if VDPA device is still added to the bus
        if (devs[vdpaId] == nil)
        {
            // Unused, clean it up
            unmapVduseById(ns.stateDir, vdpaId)
            continue
        }
        stateJSON, err := os.ReadFile(stateFile)
        if (err != nil)
        {
            klog.Warningf("error reading state file %v: %v", stateFile, err)
            continue
        }
        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))
            continue
        }
        ns.lockVolume(state.ConfigPath+":"+state.Image)
        // Recheck state file after locking
        _, err = os.ReadFile(stateFile)
        if (err != nil)
        {
            klog.Warningf("state file %v disappeared, skipping volume", stateFile)
            ns.unlockVolume(state.ConfigPath+":"+state.Image)
            continue
        }
        // Check if the storage daemon is still active
        pidFile := ns.stateDir + vdpaId + ".pid"
        exists := false
        proc, err := findByPidFile(pidFile)
        if (err == nil)
        {
            exists = proc.Signal(syscall.Signal(0)) == nil
        }
        if (!exists)
        {
            // Restart daemon
            klog.Warningf("restarting storage daemon for volume %v (VDPA ID %v)", state.Image, vdpaId)
            _ = startStorageDaemon(vdpaId, state.Image, pidFile, state.ConfigPath, state.Readonly)
        }
        ns.unlockVolume(state.ConfigPath+":"+state.Image)
    }
 }
 // NodeStageVolume mounts the volume to a staging path on the node.
 func (ns *NodeServer) NodeStageVolume(ctx context.Context, req *csi.NodeStageVolumeRequest) (*csi.NodeStageVolumeResponse, error)
 {
    klog.Infof("received node stage volume request %+v", protosanitizer.StripSecrets(req))
    ctxVars := make(map[string]string)
    err := json.Unmarshal([]byte(req.VolumeId), &ctxVars)
    if (err != nil)
    {
        return nil, status.Error(codes.Internal, "volume ID not in JSON format")
    }
    _, err = GetConnectionParams(ctxVars)
    if (err != nil)
    {
        return nil, err
    }
    volName := ctxVars["name"]
    ns.lockVolume(ctxVars["configPath"]+":"+volName)
    defer ns.unlockVolume(ctxVars["configPath"]+":"+volName)
    targetPath := req.GetStagingTargetPath()
    isBlock := req.GetVolumeCapability().GetBlock() != nil
    // Check that it's not already mounted
    _, err = mount.IsNotMountPoint(ns.mounter, targetPath)
    if (err != nil)
    {
        if (os.IsNotExist(err))
        {
            if (isBlock)
            {
                pathFile, err := os.OpenFile(targetPath, os.O_CREATE|os.O_RDWR, 0o600)
                if (err != nil)
                {
                    klog.Errorf("failed to create block device mount target %s with error: %v", targetPath, err)
                    return nil, err
                }
                err = pathFile.Close()
                if (err != nil)
                {
                    klog.Errorf("failed to close %s with error: %v", targetPath, err)
                    return nil, err
                }
            }
            else
            {
                err := os.MkdirAll(targetPath, 0777)
                if (err != nil)
                {
                    klog.Errorf("failed to create fs mount target %s with error: %v", targetPath, err)
                    return nil, err
                }
            }
        }
        else
        {
            return nil, err
        }
    }
    var devicePath, vdpaId string
    if (!ns.useVduse)
    {
        devicePath, err = mapNbd(volName, ctxVars, false)
    }
    else
    {
        devicePath, vdpaId, err = mapVduse(ns.stateDir, volName, ctxVars, false)
    }
    if (err != nil)
    {
        return nil, err
    }
    diskMounter := &mount.SafeFormatAndMount{Interface: ns.mounter, Exec: utilexec.New()}
    if (isBlock)
    {
        err = diskMounter.Mount(devicePath, targetPath, "", []string{"bind"})
    }
    else
    {
        // Check existing format
        existingFormat, err := diskMounter.GetDiskFormat(devicePath)
        if (err != nil)
        {
            klog.Errorf("failed to get disk format for path %s, error: %v", err)
            goto unmap
        }
        // Format the device (ext4 or xfs)
        fsType := req.GetVolumeCapability().GetMount().GetFsType()
        opt := req.GetVolumeCapability().GetMount().GetMountFlags()
        opt = append(opt, "_netdev")
        if ((req.VolumeCapability.AccessMode.Mode == csi.VolumeCapability_AccessMode_MULTI_NODE_READER_ONLY ||
            req.VolumeCapability.AccessMode.Mode == csi.VolumeCapability_AccessMode_SINGLE_NODE_READER_ONLY) &&
            !Contains(opt, "ro"))
        {
            opt = append(opt, "ro")
        }
        if (fsType == "xfs")
        {
            opt = append(opt, "nouuid")
        }
        readOnly := Contains(opt, "ro")
        if (existingFormat == "" && !readOnly)
        {
            var cmdOut []byte
            switch fsType
            {
                case "ext4":
                    args := []string{"-m0", "-Enodiscard,lazy_itable_init=1,lazy_journal_init=1", devicePath}
                    cmdOut, err = diskMounter.Exec.Command("mkfs.ext4", args...).CombinedOutput()
                case "xfs":
                    cmdOut, err = diskMounter.Exec.Command("mkfs.xfs", "-K", devicePath).CombinedOutput()
            }
            if (err != nil)
            {
                klog.Errorf("failed to run mkfs error: %v, output: %v", err, string(cmdOut))
                goto unmap
            }
        }
        err = diskMounter.FormatAndMount(devicePath, targetPath, fsType, opt)
        // Try to run online resize on mount.
        // FIXME: Implement online resize. It requires online resize support in vitastor-nbd.
        if (err == nil && existingFormat != "" && !readOnly)
        {
            var cmdOut []byte
            switch (fsType)
            {
                case "ext4":
                    cmdOut, err = diskMounter.Exec.Command("resize2fs", devicePath).CombinedOutput()
                case "xfs":
                    cmdOut, err = diskMounter.Exec.Command("xfs_growfs", devicePath).CombinedOutput()
            }
            if (err != nil)
            {
                klog.Errorf("failed to run resizefs error: %v, output: %v", err, string(cmdOut))
                goto unmap
            }
        }
    }
    if (err != nil)
    {
        klog.Errorf(
            "failed to mount device path (%s) to path (%s) for volume (%s) error: %s",
            devicePath, targetPath, volName, err,
        )
        goto unmap
    }
    return &csi.NodeStageVolumeResponse{}, nil
 unmap:
    if (!ns.useVduse || len(devicePath) >= 8 && devicePath[0:8] == "/dev/nbd")
    {
        unmapNbd(devicePath)
    }
    else
    {
        unmapVduseById(ns.stateDir, vdpaId)
    }
    return nil, err
 }
 // NodeUnstageVolume unstages the volume from the staging path
 func (ns *NodeServer) NodeUnstageVolume(ctx context.Context, req *csi.NodeUnstageVolumeRequest) (*csi.NodeUnstageVolumeResponse, error)
 {
    klog.Infof("received node unstage volume request %+v", protosanitizer.StripSecrets(req))
    ctxVars := make(map[string]string)
    err := json.Unmarshal([]byte(req.VolumeId), &ctxVars)
    if (err != nil)
    {
        return nil, status.Error(codes.Internal, "volume ID not in JSON format")
    }
    volName := ctxVars["name"]
    ns.lockVolume(ctxVars["configPath"]+":"+volName)
    defer ns.unlockVolume(ctxVars["configPath"]+":"+volName)
    targetPath := req.GetStagingTargetPath()
    devicePath, refCount, err := mount.GetDeviceNameFromMount(ns.mounter, targetPath)
    if (err != nil)
    {
        if (os.IsNotExist(err))
        {
            return nil, status.Error(codes.NotFound, "Target path not found")
        }
        return nil, err
    }
    if (devicePath == "")
    {
        // volume not mounted
        klog.Warningf("%s is not a mountpoint, deleting", targetPath)
        os.Remove(targetPath)
        return &csi.NodeUnstageVolumeResponse{}, nil
    }
    // unmount
    err = mount.CleanupMountPoint(targetPath, ns.mounter, false)
    if (err != nil)
    {
        return nil, err
    }
    // unmap device
    if (refCount == 1)
    {
        if (!ns.useVduse)
        {
            unmapNbd(devicePath)
        }
        else
        {
            unmapVduse(ns.stateDir, devicePath)
        }
    }
    return &csi.NodeUnstageVolumeResponse{}, nil
 }
 // NodePublishVolume mounts the volume mounted to the staging path to the target path
 func (ns *NodeServer) NodePublishVolume(ctx context.Context, req *csi.NodePublishVolumeRequest) (*csi.NodePublishVolumeResponse, error)
 {
    klog.Infof("received node publish volume request %+v", protosanitizer.StripSecrets(req))
    ctxVars := make(map[string]string)
    err := json.Unmarshal([]byte(req.VolumeId), &ctxVars)
    if (err != nil)
    {
        return nil, status.Error(codes.Internal, "volume ID not in JSON format")
    }
    _, err = GetConnectionParams(ctxVars)
    if (err != nil)
    {
        return nil, err
    }
    volName := ctxVars["name"]
    ns.lockVolume(ctxVars["configPath"]+":"+volName)
    defer ns.unlockVolume(ctxVars["configPath"]+":"+volName)
    stagingTargetPath := req.GetStagingTargetPath()
    targetPath := req.GetTargetPath()
    isBlock := req.GetVolumeCapability().GetBlock() != nil
    // Check that stagingTargetPath is mounted
    _, err = mount.IsNotMountPoint(ns.mounter, stagingTargetPath)
    if (err != nil)
    {
        klog.Errorf("staging path %v is not mounted: %v", stagingTargetPath, err)
        return nil, fmt.Errorf("staging path %v is not mounted: %v", stagingTargetPath, err)
    }
    // Check that targetPath is not already mounted
    _, err = mount.IsNotMountPoint(ns.mounter, targetPath)
    if (err != nil)
    {
        if (os.IsNotExist(err))
        {
            if (isBlock)
            {
                pathFile, err := os.OpenFile(targetPath, os.O_CREATE|os.O_RDWR, 0o600)
                if (err != nil)
                {
                    klog.Errorf("failed to create block device mount target %s with error: %v", targetPath, err)
                    return nil, err
                }
                err = pathFile.Close()
                if (err != nil)
                {
                    klog.Errorf("failed to close %s with error: %v", targetPath, err)
                    return nil, err
                }
            }
            else
            {
                err := os.MkdirAll(targetPath, 0777)
                if (err != nil)
                {
                    klog.Errorf("failed to create fs mount target %s with error: %v", targetPath, err)
                    return nil, err
                }
            }
        }
        else
        {
            return nil, err
        }
    }
    execArgs := []string{"--bind", stagingTargetPath, targetPath}
    if (req.GetReadonly())
    {
        execArgs = append(execArgs, "-o", "ro")
    }
    cmd := exec.Command("mount", execArgs...)
    cmd.Stderr = os.Stderr
    klog.Infof("binding volume %v (%v) from %v to %v", volName, ctxVars["configPath"], stagingTargetPath, targetPath)
    out, err := cmd.Output()
    if (err != nil)
    {
        return nil, fmt.Errorf("Error running mount %v: %s", strings.Join(execArgs, " "), out)
    }
    return &csi.NodePublishVolumeResponse{}, nil
 }
 // NodeUnpublishVolume unmounts the volume from the target path
 func (ns *NodeServer) NodeUnpublishVolume(ctx context.Context, req *csi.NodeUnpublishVolumeRequest) (*csi.NodeUnpublishVolumeResponse, error)
 {
    klog.Infof("received node unpublish volume request %+v", protosanitizer.StripSecrets(req))
    ctxVars := make(map[string]string)
    err := json.Unmarshal([]byte(req.VolumeId), &ctxVars)
    if (err != nil)
    {
        return nil, status.Error(codes.Internal, "volume ID not in JSON format")
    }
    volName := ctxVars["name"]
    ns.lockVolume(ctxVars["configPath"]+":"+volName)
    defer ns.unlockVolume(ctxVars["configPath"]+":"+volName)
    targetPath := req.GetTargetPath()
    devicePath, _, err := mount.GetDeviceNameFromMount(ns.mounter, targetPath)
    if (err != nil)
    {
        if (os.IsNotExist(err))
        {
            return nil, status.Error(codes.NotFound, "Target path not found")
        }
        return nil, err
    }
    if (devicePath == "")
    {
        // volume not mounted
        klog.Warningf("%s is not a mountpoint, deleting", targetPath)
        os.Remove(targetPath)
        return &csi.NodeUnpublishVolumeResponse{}, nil
    }
    // unmount
    err = mount.CleanupMountPoint(targetPath, ns.mounter, false)
    if (err != nil)
    {
        return nil, err
    }
    return &csi.NodeUnpublishVolumeResponse{}, nil
 }
 // NodeGetVolumeStats returns volume capacity statistics available for the volume
 func (ns *NodeServer) NodeGetVolumeStats(ctx context.Context, req *csi.NodeGetVolumeStatsRequest) (*csi.NodeGetVolumeStatsResponse, error)
 {
    return nil, status.Error(codes.Unimplemented, "")
 }
 // NodeExpandVolume expanding the file system on the node
 func (ns *NodeServer) NodeExpandVolume(ctx context.Context, req *csi.NodeExpandVolumeRequest) (*csi.NodeExpandVolumeResponse, error)
 {
    return nil, status.Error(codes.Unimplemented, "")
 }
 // NodeGetCapabilities returns the supported capabilities of the node server
 func (ns *NodeServer) NodeGetCapabilities(ctx context.Context, req *csi.NodeGetCapabilitiesRequest) (*csi.NodeGetCapabilitiesResponse, error)
 {
    return &csi.NodeGetCapabilitiesResponse{
        Capabilities: []*csi.NodeServiceCapability{
            &csi.NodeServiceCapability{
                Type: &csi.NodeServiceCapability_Rpc{
                    Rpc: &csi.NodeServiceCapability_RPC{
                        Type: csi.NodeServiceCapability_RPC_STAGE_UNSTAGE_VOLUME,
                    },
                },
            },
        },
    }, nil
 }
 // NodeGetInfo returns NodeGetInfoResponse for CO.
 func (ns *NodeServer) NodeGetInfo(ctx context.Context, req *csi.NodeGetInfoRequest) (*csi.NodeGetInfoResponse, error)
 {
    klog.Infof("received node get info request %+v", protosanitizer.StripSecrets(req))
    return &csi.NodeGetInfoResponse{
        NodeId: ns.NodeID,
    }, nil
 }
--- a/csi/src/server.go
+++ b/csi/src/server.go
@ -0,0 +1,36 @@
 // Copyright (c) Vitaliy Filippov, 2019+
 // License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
 package vitastor
 import (
    "k8s.io/klog"
 )
 type Driver struct
 {
    *Config
 }
 // NewDriver create new instance driver
 func NewDriver(config *Config) (*Driver, error)
 {
    if (config == nil)
    {
        klog.Errorf("Vitastor CSI driver initialization failed")
        return nil, nil
    }
    driver := &Driver{
        Config: config,
    }
    klog.Infof("Vitastor CSI driver initialized")
    return driver, nil
 }
 // Start server
 func (driver *Driver) Run()
 {
    server := NewNonBlockingGRPCServer()
    server.Start(driver.Endpoint, NewIdentityServer(driver), NewControllerServer(driver), NewNodeServer(driver))
    server.Wait()
 }
--- a/csi/src/utils.go
+++ b/csi/src/utils.go
@ -0,0 +1,301 @@
 // Copyright (c) Vitaliy Filippov, 2019+
 // License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
 package vitastor
 import (
    "errors"
    "encoding/json"
    "fmt"
    "os"
    "os/exec"
    "path/filepath"
    "strconv"
    "strings"
    "syscall"
    "k8s.io/klog"
 )
 func Contains(list []string, s string) bool
 {
    for i := 0; i < len(list); i++
    {
        if (list[i] == s)
        {
            return true
        }
    }
    return false
 }
 func checkVduseSupport() bool
 {
    // 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 (!errors.Is(err, os.ErrNotExist))
            {
                klog.Errorf("failed to check /sys/module/%s: %v", mod, err)
            }
            c := exec.Command("/sbin/modprobe", mod)
            c.Stdout = os.Stderr
            c.Stderr = os.Stderr
            err := c.Run()
            if (err != nil)
            {
                klog.Errorf("/sbin/modprobe %s failed: %v", mod, err)
                vduse = false
                break
            }
        }
    }
    // Check that vdpa tool functions
    if (vduse)
    {
        c := exec.Command("/sbin/vdpa", "-j", "dev")
        c.Stderr = os.Stderr
        err := c.Run()
        if (err != nil)
        {
            klog.Errorf("/sbin/vdpa -j dev failed: %v", err)
            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.",
        )
    }
    return vduse
 }
 func mapNbd(volName string, ctxVars map[string]string, readonly bool) (string, error)
 {
    // Map NBD device
    // FIXME: Check if already mapped
    args := []string{
        "map", "--image", volName,
    }
    if (ctxVars["configPath"] != "")
    {
        args = append(args, "--config_path", ctxVars["configPath"])
    }
    if (readonly)
    {
        args = append(args, "--readonly", "1")
    }
    stdout, stderr, err := system("/usr/bin/vitastor-nbd", args...)
    dev := strings.TrimSpace(string(stdout))
    if (dev == "")
    {
        return "", fmt.Errorf("vitastor-nbd did not return the name of NBD device. output: %s", stderr)
    }
    return dev, err
 }
 func unmapNbd(devicePath string)
 {
    // unmap NBD device
    unmapOut, unmapErr := exec.Command("/usr/bin/vitastor-nbd", "unmap", devicePath).CombinedOutput()
    if (unmapErr != nil)
    {
        klog.Errorf("failed to unmap NBD device %s: %s, error: %v", devicePath, unmapOut, unmapErr)
    }
 }
 func findByPidFile(pidFile string) (*os.Process, error)
 {
    pidBuf, err := os.ReadFile(pidFile)
    if (err != nil)
    {
        return nil, err
    }
    pid, err := strconv.ParseInt(strings.TrimSpace(string(pidBuf)), 0, 64)
    if (err != nil)
    {
        return nil, err
    }
    proc, err := os.FindProcess(int(pid))
    if (err != nil)
    {
        return nil, err
    }
    return proc, nil
 }
 func killByPidFile(pidFile string) error
 {
    klog.Infof("killing process with PID from file %s", pidFile)
    proc, err := findByPidFile(pidFile)
    if (err != nil)
    {
        return err
    }
    return proc.Signal(syscall.SIGTERM)
 }
 func startStorageDaemon(vdpaId, volName, pidFile, configPath string, readonly bool) error
 {
    // Start qemu-storage-daemon
    blockSpec := map[string]interface{}{
        "node-name": "disk1",
        "driver": "vitastor",
        "image": volName,
        "cache": map[string]bool{
            "direct": true,
            "no-flush": false,
        },
        "discard": "unmap",
    }
    if (configPath != "")
    {
        blockSpec["config-path"] = configPath
    }
    blockSpecJson, _ := json.Marshal(blockSpec)
    writable := "true"
    if (readonly)
    {
        writable = "false"
    }
    _, _, err := system(
        "/usr/bin/qemu-storage-daemon", "--daemonize", "--pidfile", pidFile, "--blockdev", string(blockSpecJson),
        "--export", "vduse-blk,id="+vdpaId+",node-name=disk1,name="+vdpaId+",num-queues=16,queue-size=128,writable="+writable,
    )
    return err
 }
 func mapVduse(stateDir string, volName string, ctxVars map[string]string, readonly bool) (string, string, error)
 {
    // Generate state file
    stateFd, err := os.CreateTemp(stateDir, "vitastor-vduse-*.json")
    if (err != nil)
    {
        return "", "", err
    }
    stateFile := stateFd.Name()
    stateFd.Close()
    vdpaId := filepath.Base(stateFile)
    vdpaId = vdpaId[0:len(vdpaId)-5] // remove ".json"
    pidFile := stateDir + vdpaId + ".pid"
    // Map VDUSE device via qemu-storage-daemon
    err = startStorageDaemon(vdpaId, volName, pidFile, ctxVars["configPath"], readonly)
    if (err == nil)
    {
        // Add device to VDPA bus
        _, _, err = system("/sbin/vdpa", "-j", "dev", "add", "name", vdpaId, "mgmtdev", "vduse")
        if (err == nil)
        {
            // Find block device name
            var matches []string
            matches, err = filepath.Glob("/sys/bus/vdpa/devices/"+vdpaId+"/virtio*/block/*")
            if (err == nil && len(matches) == 0)
            {
                err = errors.New("/sys/bus/vdpa/devices/"+vdpaId+"/virtio*/block/* is not found")
            }
            if (err == nil)
            {
                blockdev := "/dev/"+filepath.Base(matches[0])
                _, err = os.Stat(blockdev)
                if (err == nil)
                {
                    // Generate state file
                    stateJSON, _ := json.Marshal(&DeviceState{
                        ConfigPath: ctxVars["configPath"],
                        VdpaId:     vdpaId,
                        Image:      volName,
                        Blockdev:   blockdev,
                        Readonly:   readonly,
                        PidFile:    pidFile,
                    })
                    err = os.WriteFile(stateFile, stateJSON, 0600)
                    if (err == nil)
                    {
                        return blockdev, vdpaId, nil
                    }
                }
            }
        }
        killErr := killByPidFile(pidFile)
        if (killErr != nil)
        {
            klog.Errorf("Failed to kill started qemu-storage-daemon: %v", killErr)
        }
        os.Remove(stateFile)
        os.Remove(pidFile)
    }
    return "", "", err
 }
 func unmapVduse(stateDir, devicePath string)
 {
    if (len(devicePath) < 6 || devicePath[0:6] != "/dev/v")
    {
        klog.Errorf("%s does not start with /dev/v", devicePath)
        return
    }
    vduseDev, err := os.Readlink("/sys/block/"+devicePath[5:])
    if (err != nil)
    {
        klog.Errorf("%s is not a symbolic link to VDUSE device (../devices/virtual/vduse/xxx): %v", devicePath, err)
        return
    }
    vdpaId := ""
    p := strings.Index(vduseDev, "/vduse/")
    if (p >= 0)
    {
        vduseDev = vduseDev[p+7:]
        p = strings.Index(vduseDev, "/")
        if (p >= 0)
        {
            vdpaId = vduseDev[0:p]
        }
    }
    if (vdpaId == "")
    {
        klog.Errorf("%s is not a symbolic link to VDUSE device (../devices/virtual/vduse/xxx), but is %v", devicePath, vduseDev)
        return
    }
    unmapVduseById(stateDir, vdpaId)
 }
 func unmapVduseById(stateDir, vdpaId string)
 {
    _, err := os.Stat("/sys/bus/vdpa/devices/"+vdpaId)
    if (err != nil)
    {
        klog.Errorf("failed to stat /sys/bus/vdpa/devices/"+vdpaId+": %v", err)
    }
    else
    {
        _, _, _ = system("/sbin/vdpa", "-j", "dev", "del", vdpaId)
    }
    stateFile := stateDir + vdpaId + ".json"
    os.Remove(stateFile)
    pidFile := stateDir + vdpaId + ".pid"
    _, err = os.Stat(pidFile)
    if (os.IsNotExist(err))
    {
        // ok, already killed
    }
    else if (err != nil)
    {
        klog.Errorf("Failed to stat %v: %v", pidFile, err)
        return
    }
    else
    {
        err = killByPidFile(pidFile)
        if (err != nil)
        {
            klog.Errorf("Failed to kill started qemu-storage-daemon: %v", err)
        }
        os.Remove(pidFile)
    }
 }
--- a/csi/vitastor-csi.go
+++ b/csi/vitastor-csi.go
@ -0,0 +1,39 @@
 // Copyright (c) Vitaliy Filippov, 2019+
 // License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
 package main
 import (
    "flag"
    "fmt"
    "os"
    "k8s.io/klog"
    "vitastor.io/csi/src"
 )
 func main()
 {
    var config = vitastor.NewConfig()
    flag.StringVar(&config.Endpoint, "endpoint", "", "CSI endpoint")
    flag.StringVar(&config.NodeID, "node", "", "Node ID")
    flag.Parse()
    if (config.Endpoint == "")
    {
        config.Endpoint = os.Getenv("CSI_ENDPOINT")
    }
    if (config.NodeID == "")
    {
        config.NodeID = os.Getenv("NODE_ID")
    }
    if (config.Endpoint == "" && config.NodeID == "")
    {
        fmt.Fprintf(os.Stderr, "Please set -endpoint and -node / CSI_ENDPOINT & NODE_ID env vars\n")
        os.Exit(1)
    }
    drv, err := vitastor.NewDriver(config)
    if (err != nil)
    {
        klog.Fatalln(err)
    }
    drv.Run()
 }
--- a/debian/build-pve-qemu.sh
+++ b/debian/build-pve-qemu.sh
@ -0,0 +1,58 @@
 exit
 git clone https://git.yourcmc.ru/vitalif/pve-qemu .
 # bookworm
 docker run -it -v `pwd`/pve-qemu:/root/pve-qemu --name pve-qemu-bullseye debian:bullseye bash
 perl -i -pe 's/Types: deb$/Types: deb deb-src/' /etc/apt/sources.list.d/debian.sources
 echo 'deb [arch=amd64] http://download.proxmox.com/debian/pve bookworm pve-no-subscription' >> /etc/apt/sources.list
 echo 'deb https://vitastor.io/debian bookworm main' >> /etc/apt/sources.list
 echo 'APT::Install-Recommends false;' >> /etc/apt/apt.conf
 echo 'ru_RU UTF-8' >> /etc/locale.gen
 echo 'en_US UTF-8' >> /etc/locale.gen
 apt-get update
 apt-get install wget ca-certificates
 wget https://enterprise.proxmox.com/debian/proxmox-release-bookworm.gpg -O /etc/apt/trusted.gpg.d/proxmox-release-bookworm.gpg
 wget https://vitastor.io/debian/pubkey.gpg -O /etc/apt/trusted.gpg.d/vitastor.gpg
 apt-get update
 apt-get install git devscripts equivs wget mc libjemalloc-dev vitastor-client-dev lintian locales
 mk-build-deps --install ./control
 # bullseye
 docker run -it -v `pwd`/pve-qemu:/root/pve-qemu --name pve-qemu-bullseye debian:bullseye bash
 grep '^deb ' /etc/apt/sources.list | perl -pe 's/^deb /deb-src /' >> /etc/apt/sources.list
 echo 'deb [arch=amd64] http://download.proxmox.com/debian/pve bullseye pve-no-subscription' >> /etc/apt/sources.list
 echo 'deb https://vitastor.io/debian bullseye main' >> /etc/apt/sources.list
 echo 'APT::Install-Recommends false;' >> /etc/apt/apt.conf
 echo 'ru_RU UTF-8' >> /etc/locale.gen
 echo 'en_US UTF-8' >> /etc/locale.gen
 apt-get update
 apt-get install wget
 wget https://enterprise.proxmox.com/debian/proxmox-release-bullseye.gpg -O /etc/apt/trusted.gpg.d/proxmox-release-bullseye.gpg
 wget https://vitastor.io/debian/pubkey.gpg -O /etc/apt/trusted.gpg.d/vitastor.gpg
 apt-get update
 apt-get install git devscripts equivs wget mc libjemalloc-dev vitastor-client-dev lintian locales
 mk-build-deps --install ./control
 # buster
 docker run -it -v `pwd`/pve-qemu:/root/pve-qemu --name pve-qemu-buster debian:buster bash
 grep '^deb ' /etc/apt/sources.list | perl -pe 's/^deb /deb-src /' >> /etc/apt/sources.list
 echo 'deb [arch=amd64] http://download.proxmox.com/debian/pve buster pve-no-subscription' >> /etc/apt/sources.list
 echo 'deb https://vitastor.io/debian buster main' >> /etc/apt/sources.list
 echo 'deb http://deb.debian.org/debian buster-backports main' >> /etc/apt/sources.list
 echo 'APT::Install-Recommends false;' >> /etc/apt/apt.conf
 echo 'ru_RU UTF-8' >> /etc/locale.gen
 echo 'en_US UTF-8' >> /etc/locale.gen
 apt-get update
 apt-get install wget ca-certificates
 wget http://download.proxmox.com/debian/proxmox-ve-release-6.x.gpg -O /etc/apt/trusted.gpg.d/proxmox-ve-release-6.x.gpg
 wget https://vitastor.io/debian/pubkey.gpg -O /etc/apt/trusted.gpg.d/vitastor.gpg
 apt-get update
 apt-get install git devscripts equivs wget mc libjemalloc-dev vitastor-client-dev lintian locales
 mk-build-deps --install ./control
--- a/debian/build-vitastor-bookworm.sh
+++ b/debian/build-vitastor-bookworm.sh
@ -0,0 +1,7 @@
 #!/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
--- a/debian/build-vitastor-bullseye.sh
+++ b/debian/build-vitastor-bullseye.sh
@ -0,0 +1,7 @@
 #!/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
--- a/debian/build-vitastor-buster.sh
+++ b/debian/build-vitastor-buster.sh
@ -0,0 +1,7 @@
 #!/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
--- a/debian/build-vitastor-ubuntu-jammy.sh
+++ b/debian/build-vitastor-ubuntu-jammy.sh
@ -0,0 +1,7 @@
 #!/bin/bash
 cat < vitastor.Dockerfile > ../Dockerfile
 cd ..
 mkdir -p packages
 sudo podman build --build-arg DISTRO=ubuntu --build-arg REL=jammy -v `pwd`/packages:/root/packages -f Dockerfile .
 rm Dockerfile
--- a/debian/changelog
+++ b/debian/changelog
@ -0,0 +1,41 @@
 vitastor (1.6.1-1) unstable; urgency=medium
  * Bugfixes
 -- Vitaliy Filippov <vitalif@yourcmc.ru>  Fri, 03 Jun 2022 02:09:44 +0300
 vitastor (0.7.0-1) unstable; urgency=medium
  * Implement NFS proxy
  * Add documentation
  * Bugfixes
 -- Vitaliy Filippov <vitalif@yourcmc.ru>  Sun, 29 May 2022 23:39:13 +0300
 vitastor (0.6.3-1) unstable; urgency=medium
  * RDMA support
  * Bugfixes
 -- Vitaliy Filippov <vitalif@yourcmc.ru>  Sat, 01 May 2021 18:46:10 +0300
 vitastor (0.6.0-1) unstable; urgency=medium
  * Snapshots and Copy-on-Write clones
  * Image metadata in etcd (name, size)
  * Image I/O and space statistics in etcd
  * Write throttling for smoothing random write workloads in SSD+HDD configurations
 -- Vitaliy Filippov <vitalif@yourcmc.ru>  Sun, 11 Apr 2021 00:49:18 +0300
 vitastor (0.5.1-1) unstable; urgency=medium
  * Add jerasure support
 -- Vitaliy Filippov <vitalif@yourcmc.ru>  Sat, 05 Dec 2020 17:02:26 +0300
 vitastor (0.5-1) unstable; urgency=medium
  * First packaging for Debian
 -- Vitaliy Filippov <vitalif@yourcmc.ru>  Thu, 05 Nov 2020 02:20:59 +0300
--- a/debian/compat
+++ b/debian/compat
@ -0,0 +1 @@
 13
--- a/debian/control
+++ b/debian/control
@ -0,0 +1,55 @@
 Source: vitastor
 Section: admin
 Priority: optional
 Maintainer: Vitaliy Filippov <vitalif@yourcmc.ru>
 Build-Depends: debhelper, liburing-dev (>= 0.6), g++ (>= 8), libstdc++6 (>= 8), linux-libc-dev, libgoogle-perftools-dev, libjerasure-dev, libgf-complete-dev, libibverbs-dev, libisal-dev, cmake, pkg-config, libnl-3-dev, libnl-genl-3-dev
 Standards-Version: 4.5.0
 Homepage: https://vitastor.io/
 Rules-Requires-Root: no
 Package: vitastor
 Architecture: amd64
 Depends: vitastor-osd, vitastor-mon, vitastor-client, vitastor-client-dev, vitastor-fio
 Description: Vitastor, a fast software-defined clustered block storage
 Vitastor is a small, simple and fast clustered block storage (storage for VM drives),
 architecturally similar to Ceph which means strong consistency, primary-replication,
 symmetric clustering and automatic data distribution over any number of drives of any
 size with configurable redundancy (replication or erasure codes/XOR).
 Package: vitastor-osd
 Architecture: amd64
 Depends: ${shlibs:Depends}, ${misc:Depends}, vitastor-client (= ${binary:Version}), fdisk, util-linux, parted
 Description: Vitastor, a fast software-defined clustered block storage - object storage daemon
 Vitastor object storage daemon, i.e. server program that stores data.
 Package: vitastor-mon
 Architecture: amd64
 Depends: ${misc:Depends}, nodejs (>= 10), node-sprintf-js, node-ws (>= 7), lp-solve
 Description: Vitastor, a fast software-defined clustered block storage - monitor
 Vitastor monitor, i.e. server program responsible for watching cluster state and
 scheduling cluster-level operations.
 Package: vitastor-client
 Architecture: amd64
 Depends: ${shlibs:Depends}, ${misc:Depends}
 Description: Vitastor, a fast software-defined clustered block storage - client
 Vitastor client library and command-line interface.
 Package: vitastor-client-dev
 Section: devel
 Architecture: amd64
 Depends: ${misc:Depends}, vitastor-client (= ${binary:Version})
 Description: Vitastor, a fast software-defined clustered block storage - development files
 Vitastor library headers for development.
 Package: vitastor-fio
 Architecture: amd64
 Depends: ${shlibs:Depends}, ${misc:Depends}, vitastor-client (= ${binary:Version}), fio (= ${dep:fio})
 Description: Vitastor, a fast software-defined clustered block storage - fio drivers
 Vitastor fio drivers for benchmarking.
 Package: pve-storage-vitastor
 Architecture: amd64
 Depends: ${shlibs:Depends}, ${misc:Depends}, vitastor-client (= ${binary:Version})
 Description: Vitastor Proxmox Virtual Environment storage plugin
 Vitastor storage plugin for Proxmox Virtual Environment.
--- a/debian/copyright
+++ b/debian/copyright
@ -0,0 +1,21 @@
 Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
 Upstream-Name: vitastor
 Upstream-Contact: Vitaliy Filippov <vitalif@yourcmc.ru>
 Source: https://vitastor.io
 Files: *
 Copyright: 2019+ Vitaliy Filippov <vitalif@yourcmc.ru>
 License: Multiple licenses VNPL-1.1 and/or GPL-2.0+
 All server-side code (OSD, Monitor and so on) is licensed under the terms of
 Vitastor Network Public License 1.1 (VNPL 1.1), a copyleft license based on
 GNU GPLv3.0 with the additional "Network Interaction" clause which requires
 opensourcing all programs directly or indirectly interacting with Vitastor
 through a computer network and expressly designed to be used in conjunction
 with it ("Proxy Programs"). Proxy Programs may be made public not only under
 the terms of the same license, but also under the terms of any GPL-Compatible
 Free Software License, as listed by the Free Software Foundation.
 This is a stricter copyleft license than the Affero GPL.
 .
 Client libraries (cluster_client and so on) are dual-licensed under the same
 VNPL 1.1 and also GNU GPL 2.0 or later to allow for compatibility with GPLed
 software like QEMU and fio.
--- a/debian/fio_version
+++ b/debian/fio_version
@ -0,0 +1 @@
 dep:fio=3.16-1
--- a/debian/install
+++ b/debian/install
@ -0,0 +1,4 @@
 VNPL-1.1.txt usr/share/doc/vitastor
 GPL-2.0.txt usr/share/doc/vitastor
 README.md usr/share/doc/vitastor
 README-ru.md usr/share/doc/vitastor
--- a/debian/libisal.pc
+++ b/debian/libisal.pc
@ -0,0 +1,11 @@
 prefix=/usr
 exec_prefix=${prefix}
 libdir=${prefix}/lib/x86_64-linux-gnu
 includedir=${prefix}/include
 Name: libisal
 Description: Library for storage systems
 Version: 2.30.0
 Libs: -L${libdir} -lisal
 Libs.private:
 Cflags: -I${includedir}
--- a/debian/libvirt.Dockerfile
+++ b/debian/libvirt.Dockerfile
@ -0,0 +1,41 @@
 # Build patched libvirt for Debian Buster or Bullseye/Sid inside a container
 # cd ..; podman build --build-arg DISTRO=debian --build-arg REL=bullseye -v `pwd`/packages:/root/packages -f debian/libvirt.Dockerfile .
 ARG DISTRO=
 ARG REL=
 FROM $DISTRO:$REL
 ARG REL=
 WORKDIR /root
 RUN if ([ "${DISTRO}" = "debian" ]) && ( [ "${REL}" = "buster" -o "${REL}" = "bullseye" ] ); then \
        echo "deb http://deb.debian.org/debian $REL-backports main" >> /etc/apt/sources.list; \
        echo >> /etc/apt/preferences; \
        echo 'Package: *' >> /etc/apt/preferences; \
        echo "Pin: release a=$REL-backports" >> /etc/apt/preferences; \
        echo 'Pin-Priority: 500' >> /etc/apt/preferences; \
    fi; \
    grep '^deb ' /etc/apt/sources.list | perl -pe 's/^deb/deb-src/' >> /etc/apt/sources.list; \
    echo 'APT::Install-Recommends false;' >> /etc/apt/apt.conf; \
    echo 'APT::Install-Suggests false;' >> /etc/apt/apt.conf
 RUN apt-get update; apt-get -y install devscripts
 RUN apt-get -y build-dep libvirt0
 RUN apt-get -y install libglusterfs-dev
 RUN apt-get --download-only source libvirt
 ADD patches/libvirt-5.0-vitastor.diff patches/libvirt-7.0-vitastor.diff patches/libvirt-7.5-vitastor.diff patches/libvirt-7.6-vitastor.diff patches/libvirt-8.0-vitastor.diff /root
 RUN set -e; \
    mkdir -p /root/packages/libvirt-$REL; \
    rm -rf /root/packages/libvirt-$REL/*; \
    cd /root/packages/libvirt-$REL; \
    dpkg-source -x /root/libvirt*.dsc; \
    D=$(ls -d libvirt-*/); \
    V=$(ls -d libvirt-*/ | perl -pe 's/libvirt-(\d+\.\d+).*/$1/'); \
    cp /root/libvirt-$V-vitastor.diff $D/debian/patches; \
    echo libvirt-$V-vitastor.diff >> $D/debian/patches/series; \
    cd $D; \
    V=$(head -n1 debian/changelog | perl -pe 's/^.*\((.*?)(~bpo[\d\+]*)?(\+deb[u\d]+)?\).*$/$1/')+vitastor2; \
    DEBEMAIL="Vitaliy Filippov <vitalif@yourcmc.ru>" dch -D $REL -v $V 'Add Vitastor support'; \
    DEB_BUILD_OPTIONS=nocheck dpkg-buildpackage --jobs=auto -sa; \
    rm -rf /root/packages/libvirt-$REL/$D
--- a/debian/patched-qemu.Dockerfile
+++ b/debian/patched-qemu.Dockerfile
@ -0,0 +1,61 @@
 # Build patched QEMU for Debian inside a container
 # cd ..; podman build --build-arg REL=bullseye -v `pwd`/packages:/root/packages -f debian/patched-qemu.Dockerfile .
 ARG REL=
 FROM debian:$REL
 ARG REL=
 WORKDIR /root
 RUN if [ "$REL" = "buster" -o "$REL" = "bullseye" -o "$REL" = "bookworm" ]; then \
        echo "deb http://deb.debian.org/debian $REL-backports main" >> /etc/apt/sources.list; \
        echo >> /etc/apt/preferences; \
        echo 'Package: *' >> /etc/apt/preferences; \
        echo "Pin: release a=$REL-backports" >> /etc/apt/preferences; \
        echo 'Pin-Priority: 500' >> /etc/apt/preferences; \
    fi; \
    grep '^deb ' /etc/apt/sources.list | perl -pe 's/^deb/deb-src/' >> /etc/apt/sources.list; \
    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
 RUN apt-get -y install fio liburing-dev libgoogle-perftools-dev devscripts
 RUN apt-get -y build-dep qemu
 # To build a custom version
 #RUN cp /root/packages/qemu-orig/* /root
 RUN apt-get --download-only source qemu
 ADD patches /root/vitastor/patches
 ADD src/client/qemu_driver.c /root/qemu_driver.c
 #RUN set -e; \
 #    apt-get install -y wget; \
 #    wget -q -O /etc/apt/trusted.gpg.d/vitastor.gpg https://vitastor.io/debian/pubkey.gpg; \
 #    (echo deb http://vitastor.io/debian $REL main > /etc/apt/sources.list.d/vitastor.list); \
 #    (echo "APT::Install-Recommends false;" > /etc/apt/apt.conf) && \
 #    apt-get update; \
 #    apt-get install -y vitastor-client vitastor-client-dev quilt
 RUN set -e; \
    dpkg -i /root/packages/vitastor-$REL/vitastor-client_*.deb /root/packages/vitastor-$REL/vitastor-client-dev_*.deb; \
    apt-get update; \
    apt-get install -y quilt; \
    mkdir -p /root/packages/qemu-$REL; \
    rm -rf /root/packages/qemu-$REL/*; \
    cd /root/packages/qemu-$REL; \
    dpkg-source -x /root/qemu*.dsc; \
    QEMU_VER=$(ls -d qemu*/ | perl -pe 's!^.*?(\d+\.\d+).*!$1!'); \
    D=$(ls -d qemu*/); \
    cp /root/vitastor/patches/qemu-$QEMU_VER-vitastor.patch ./qemu-*/debian/patches; \
    echo qemu-$QEMU_VER-vitastor.patch >> $D/debian/patches/series; \
    cd /root/packages/qemu-$REL/qemu-*/; \
    quilt push -a; \
    quilt add block/vitastor.c; \
    cp /root/qemu_driver.c block/vitastor.c; \
    quilt refresh; \
    V=$(head -n1 debian/changelog | perl -pe 's/5\.2\+dfsg-9/5.2+dfsg-11/; s/^.*\((.*?)(~bpo[\d\+]*)?\).*$/$1/')+vitastor4; \
    if [ "$REL" = bullseye ]; then V=${V}bullseye; fi; \
    DEBEMAIL="Vitaliy Filippov <vitalif@yourcmc.ru>" dch -D $REL -v $V 'Plug Vitastor block driver'; \
    DEB_BUILD_OPTIONS=nocheck dpkg-buildpackage --jobs=auto -sa; \
    rm -rf /root/packages/qemu-$REL/qemu-*/
--- a/debian/pve-storage-vitastor.install
+++ b/debian/pve-storage-vitastor.install
@ -0,0 +1 @@
 patches/VitastorPlugin.pm usr/share/perl5/PVE/Storage/Custom/
--- a/debian/raw.h
+++ b/debian/raw.h
@ -0,0 +1,19 @@
 /* Removed in Linux 5.14 */
 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
 #ifndef __LINUX_RAW_H
 #define __LINUX_RAW_H
 #include <linux/types.h>
 #define RAW_SETBIND	_IO( 0xac, 0 )
 #define RAW_GETBIND	_IO( 0xac, 1 )
 struct raw_config_request 
 {
 	int	raw_minor;
 	__u64	block_major;
 	__u64	block_minor;
 };
 #endif /* __LINUX_RAW_H */
--- a/debian/rules
+++ b/debian/rules
@ -0,0 +1,10 @@
 #!/usr/bin/make -f
 export DH_VERBOSE = 1
 %:
 	dh $@
 override_dh_installdeb:
 	cat debian/fio_version >> debian/vitastor-fio.substvars
 	[ -f debian/qemu_version ] && (cat debian/qemu_version >> debian/vitastor-qemu.substvars) || true
 	dh_installdeb
--- a/debian/source/format
+++ b/debian/source/format
@ -0,0 +1 @@
 3.0 (quilt)
--- a/debian/vitastor-client-dev.install
+++ b/debian/vitastor-client-dev.install
@ -0,0 +1,2 @@
 usr/include
 usr/lib/*/pkgconfig
--- a/debian/vitastor-client.install
+++ b/debian/vitastor-client.install
@ -0,0 +1,8 @@
 usr/bin/vita
 usr/bin/vitastor-cli
 usr/bin/vitastor-rm
 usr/bin/vitastor-nbd
 usr/bin/vitastor-nfs
 usr/bin/vitastor-kv
 usr/bin/vitastor-kv-stress
 usr/lib/*/libvitastor*.so*
--- a/debian/vitastor-fio.install
+++ b/debian/vitastor-fio.install
@ -0,0 +1 @@
 usr/lib/*/libfio*.so*
--- a/debian/vitastor-mon.install
+++ b/debian/vitastor-mon.install
@ -0,0 +1,3 @@
 mon usr/lib/vitastor/mon
 mon/scripts/make-etcd usr/lib/vitastor/mon
 mon/scripts/vitastor-mon.service /lib/systemd/system
--- a/debian/vitastor-mon.postinst
+++ b/debian/vitastor-mon.postinst
@ -0,0 +1,9 @@
 #!/bin/sh
 set -e
 if [ "$1" = "configure" ]; then
 	addgroup --system --quiet vitastor
 	adduser --system --quiet --ingroup vitastor --no-create-home --home /nonexistent vitastor
 	mkdir -p /etc/vitastor
 fi
--- a/debian/vitastor-osd.install
+++ b/debian/vitastor-osd.install
@ -0,0 +1,6 @@
 usr/bin/vitastor-osd
 usr/bin/vitastor-disk
 usr/bin/vitastor-dump-journal
 mon/scripts/vitastor-osd@.service /lib/systemd/system
 mon/scripts/vitastor.target /lib/systemd/system
 mon/scripts/90-vitastor.rules /lib/udev/rules.d
--- a/debian/vitastor-osd.postinst
+++ b/debian/vitastor-osd.postinst
@ -0,0 +1,10 @@
 #!/bin/sh
 set -e
 if [ "$1" = "configure" ]; then
 	addgroup --system --quiet vitastor
 	adduser --system --quiet --ingroup vitastor --no-create-home --home /nonexistent vitastor
 	install -o vitastor -g vitastor -d /var/log/vitastor
 	mkdir -p /etc/vitastor
 fi
--- a/debian/vitastor.Dockerfile
+++ b/debian/vitastor.Dockerfile
@ -0,0 +1,59 @@
 # 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 if [ "$REL" = "buster" -o "$REL" = "bullseye" ]; then \
        echo "deb http://deb.debian.org/debian $REL-backports main" >> /etc/apt/sources.list; \
        echo >> /etc/apt/preferences; \
        echo 'Package: *' >> /etc/apt/preferences; \
        echo "Pin: release a=$REL-backports" >> /etc/apt/preferences; \
        echo 'Pin-Priority: 500' >> /etc/apt/preferences; \
    fi; \
    grep '^deb ' /etc/apt/sources.list | perl -pe 's/^deb/deb-src/' >> /etc/apt/sources.list; \
    perl -i -pe 's/Types: deb$/Types: deb deb-src/' /etc/apt/sources.list.d/debian.sources || true; \
    echo 'APT::Install-Recommends false;' >> /etc/apt/apt.conf; \
    echo 'APT::Install-Suggests false;' >> /etc/apt/apt.conf
 RUN apt-get update
 RUN apt-get -y install fio liburing-dev libgoogle-perftools-dev devscripts
 RUN apt-get -y build-dep fio
 RUN apt-get --download-only source fio
 RUN apt-get update && apt-get -y install libjerasure-dev cmake libibverbs-dev libisal-dev libnl-3-dev libnl-genl-3-dev
 ADD . /root/vitastor
 RUN set -e -x; \
    [ -e /usr/lib/x86_64-linux-gnu/pkgconfig/libisal.pc ] || cp /root/vitastor/debian/libisal.pc /usr/lib/x86_64-linux-gnu/pkgconfig; \
    mkdir -p /root/fio-build/; \
    cd /root/fio-build/; \
    rm -rf /root/fio-build/*; \
    dpkg-source -x /root/fio*.dsc; \
    mkdir -p /root/packages/vitastor-$REL; \
    rm -rf /root/packages/vitastor-$REL/*; \
    cd /root/packages/vitastor-$REL; \
    cp -r /root/vitastor vitastor-1.6.1; \
    cd vitastor-1.6.1; \
    ln -s /root/fio-build/fio-*/ ./fio; \
    FIO=$(head -n1 fio/debian/changelog | perl -pe 's/^.*\((.*?)\).*$/$1/'); \
    ls /usr/include/linux/raw.h || cp ./debian/raw.h /usr/include/linux/raw.h; \
    sh copy-fio-includes.sh; \
    rm fio; \
    mkdir -p a b debian/patches; \
    mv fio-copy b/fio; \
    diff -NaurpbB a b > debian/patches/fio-headers.patch || true; \
    echo fio-headers.patch >> debian/patches/series; \
    rm -rf a b; \
    echo "dep:fio=$FIO" > debian/fio_version; \
    cd /root/packages/vitastor-$REL; \
    tar --sort=name --mtime='2020-01-01' --owner=0 --group=0 --exclude=debian -cJf vitastor_1.6.1.orig.tar.xz vitastor-1.6.1; \
    cd vitastor-1.6.1; \
    V=$(head -n1 debian/changelog | perl -pe 's/^.*\((.*?)\).*$/$1/'); \
    DEBFULLNAME="Vitaliy Filippov <vitalif@yourcmc.ru>" dch -D $REL -v "$V""$REL" "Rebuild for $REL"; \
    DEB_BUILD_OPTIONS=nocheck dpkg-buildpackage --jobs=auto -sa; \
    rm -rf /root/packages/vitastor-$REL/vitastor-*/
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@ -0,0 +1,9 @@
 # Build Docker image with Vitastor packages
 FROM debian:bullseye
 ADD vitastor.list /etc/apt/sources.list.d
 ADD vitastor.gpg /etc/apt/trusted.gpg.d
 ADD vitastor.pref /etc/apt/preferences.d
 ADD apt.conf /etc/apt/
 RUN apt-get update && apt-get -y install vitastor qemu-system-x86 qemu-system-common && apt-get clean
--- a/docker/apt.conf
+++ b/docker/apt.conf
@ -0,0 +1 @@
 APT::Install-Recommends false;
--- a/docker/vitastor.gpg
+++ b/docker/vitastor.gpg
--- a/docker/vitastor.list
+++ b/docker/vitastor.list
@ -0,0 +1 @@
 deb http://vitastor.io/debian bullseye main
--- a/Show More
+++ b/Show More
		`@ -0,0 +1 @@`
							`Subproject commit 8de8b467acbca50cfd8835c20e0e379110f3b32b`
		`@ -0,0 +1 @@`
							`patches/VitastorPlugin.pm usr/share/perl5/PVE/Storage/Custom/`