Test SQ poll threads. Unstable and in fact slower :(

2020-03-03 17:23:39 +03:00
602 changed files with 8338 additions and 121318 deletions
--- a/.dockerignore
+++ b/.dockerignore
@ -1,19 +0,0 @@
 .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
@ -1,36 +0,0 @@
 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 update && apt-get -y install jq lp-solve sudo nfs-common fdisk parted
 RUN apt-get --download-only source fio qemu=`dpkg -s qemu-system-x86|grep ^Version:|awk '{print $2}'`
 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
@ -1,19 +0,0 @@
 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
--- a/.gitea/workflows/tests-to-yaml.pl
+++ b/.gitea/workflows/tests-to-yaml.pl
@ -1,83 +0,0 @@
 #!/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';
            }
            elsif ($1 eq 'ANTIETCD')
            {
                $test_name .= '_antietcd';
            }
            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
@ -1,5 +0,0 @@
 *.o
 *.so
 package-lock.json
 fio
 qemu
--- a/.gitmodules
+++ b/.gitmodules
@ -1,6 +0,0 @@
 [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
@ -1,115 +0,0 @@
 ## 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
@ -1,108 +0,0 @@
 ## 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
@ -1,7 +0,0 @@
 cmake_minimum_required(VERSION 2.8.12)
 project(vitastor)
 set(VITASTOR_VERSION "1.10.0")
 add_subdirectory(src)
--- a/GPL-2.0.txt
+++ b/GPL-2.0.txt
@ -1,339 +0,0 @@
                    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
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                    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:
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 either verbatim or with modifications and/or translated into another
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 is covered only if its contents constitute a work based on the
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 Whether that is true depends on what the Program does.
  1. You may copy and distribute verbatim copies of the Program's
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 You may charge a fee for the physical act of transferring a copy, and
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 These requirements apply to the modified work as a whole.  If
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 under Section 2) in object code or executable form under the terms of
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 except as expressly provided under this License.  Any attempt
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 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
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 system; it is up to the author/donor to decide if he or she is willing
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 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
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 Each version is given a distinguishing version number.  If the Program
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  10. If you wish to incorporate parts of the Program into other free
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                            NO WARRANTY
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                     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
@ -1,27 +0,0 @@
 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/66
+++ b/66
@ -0,0 +1,66 @@
 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 timerfd_interval.o
 # -fsanitize=address
 CXXFLAGS := -g -O3 -Wall -Wno-sign-compare -Wno-comment -Wno-parentheses -Wno-pointer-arith -fPIC -fdiagnostics-color=always
 all: $(BLOCKSTORE_OBJS) libfio_blockstore.so osd libfio_sec_osd.so test_blockstore stub_osd stub_bench osd_test
 clean:
 	rm -f *.o
 crc32c.o: crc32c.c
 	g++ $(CXXFLAGS) -c -o $@ $<
 json11.o: json11/json11.cpp
 	g++ $(CXXFLAGS) -c -o json11.o json11/json11.cpp
 allocator.o: allocator.cpp allocator.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 ringloop.o: ringloop.cpp ringloop.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 timerfd_interval.o: timerfd_interval.cpp timerfd_interval.h ringloop.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 %.o: %.cpp allocator.h blockstore_flush.h blockstore.h blockstore_impl.h blockstore_init.h blockstore_journal.h crc32c.h ringloop.h timerfd_interval.h object_id.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 libblockstore.so: $(BLOCKSTORE_OBJS)
 	g++ $(CXXFLAGS) -o libblockstore.so -shared $(BLOCKSTORE_OBJS) -ltcmalloc_minimal -luring
 libfio_blockstore.so: ./libblockstore.so fio_engine.cpp json11.o
 	g++ $(CXXFLAGS) -shared -o libfio_blockstore.so fio_engine.cpp json11.o ./libblockstore.so -ltcmalloc_minimal -luring
 OSD_OBJS := osd.o osd_secondary.o osd_receive.o osd_send.o osd_peering.o osd_peering_pg.o osd_primary.o osd_rmw.o json11.o timerfd_interval.o
 osd_secondary.o: osd_secondary.cpp osd.h osd_ops.h ringloop.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 osd_receive.o: osd_receive.cpp osd.h osd_ops.h ringloop.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 osd_send.o: osd_send.cpp osd.h osd_ops.h ringloop.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 osd_peering.o: osd_peering.cpp osd.h osd_ops.h osd_peering_pg.h ringloop.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 osd_peering_pg.o: osd_peering_pg.cpp object_id.h osd_peering_pg.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 osd_rmw.o: osd_rmw.cpp osd_rmw.h xor.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 osd_rmw_test: osd_rmw_test.cpp osd_rmw.cpp osd_rmw.h xor.h
 	g++ $(CXXFLAGS) -o $@ $<
 osd_primary.o: osd_primary.cpp osd.h osd_ops.h osd_peering_pg.h xor.h ringloop.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 osd.o: osd.cpp osd.h osd_ops.h osd_peering_pg.h ringloop.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 osd: ./libblockstore.so osd_main.cpp osd.h osd_ops.h $(OSD_OBJS)
 	g++ $(CXXFLAGS) -o osd osd_main.cpp $(OSD_OBJS) ./libblockstore.so -ltcmalloc_minimal -luring
 stub_osd: stub_osd.cpp osd_ops.h rw_blocking.o
 	g++ $(CXXFLAGS) -o stub_osd stub_osd.cpp rw_blocking.o -ltcmalloc_minimal
 stub_bench: stub_bench.cpp osd_ops.h rw_blocking.o
 	g++ $(CXXFLAGS) -o stub_bench stub_bench.cpp rw_blocking.o -ltcmalloc_minimal
 rw_blocking.o: rw_blocking.cpp rw_blocking.h
 	g++ $(CXXFLAGS) -c -o $@ $<
 osd_test: osd_test.cpp osd_ops.h rw_blocking.o
 	g++ $(CXXFLAGS) -o osd_test osd_test.cpp rw_blocking.o -ltcmalloc_minimal
 libfio_sec_osd.so: fio_sec_osd.cpp osd_ops.h rw_blocking.o
 	g++ $(CXXFLAGS) -ltcmalloc_minimal -shared -o libfio_sec_osd.so fio_sec_osd.cpp rw_blocking.o -luring
 test_blockstore: ./libblockstore.so test_blockstore.cpp
 	g++ $(CXXFLAGS) -o test_blockstore test_blockstore.cpp ./libblockstore.so -ltcmalloc_minimal -luring
 test: test.cpp osd_peering_pg.o
 	g++ $(CXXFLAGS) -o test test.cpp osd_peering_pg.o -luring
 test_allocator: test_allocator.cpp allocator.o
 	g++ $(CXXFLAGS) -o test_allocator test_allocator.cpp allocator.o
--- a/README-ru.md
+++ b/README-ru.md
@ -1,105 +0,0 @@
 # 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, OpenNebula, Proxmox, Kubernetes.
 Другие драйверы могут также быть легко реализованы.
 Подробности смотрите в документации по ссылкам. Можете начать отсюда: [Быстрый старт](docs/intro/quickstart.ru.md).
 ## 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)
  - [OpenNebula](docs/installation/opennebula.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.ru.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
@ -1,105 +0,0 @@
 # 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, OpenNebula, Proxmox, Kubernetes drivers.
 More drivers may be created easily.
 Read more details in the documentation. You can start from here: [Quick Start](docs/intro/quickstart.en.md).
 ## 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)
  - [OpenNebula](docs/installation/opennebula.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
@ -1,680 +0,0 @@
                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
@ -1,648 +0,0 @@
                     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
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  11. Patents.
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                     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
@ -0,0 +1,127 @@
 #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
@ -0,0 +1,18 @@
 #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/blockstore.cpp
+++ b/blockstore.cpp
@ -0,0 +1,61 @@
 #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();
 }
 uint32_t blockstore_t::get_disk_alignment()
 {
    return impl->get_disk_alignment();
 }
--- a/src/blockstore/blockstore.h
+++ b/src/blockstore/blockstore.h
@ -1,6 +1,3 @@
 // Copyright (c) Vitaliy Filippov, 2019+
 // License: VNPL-1.1 (see README.md for details)
 #pragma once
 #ifndef _LARGEFILE64_SOURCE
@ -9,41 +6,32 @@
 #include <stdint.h>
 #include <string>
 #include <map>
 #include <unordered_map>
 #include <functional>
 #include "object_id.h"
 #include "ringloop.h"
 #include "timerfd_manager.h"
 // Memory alignment for direct I/O (usually 512 bytes)
-#ifndef DIRECT_IO_ALIGNMENT
+// All other alignments must be a multiple of this one
-#define DIRECT_IO_ALIGNMENT 512
+#define MEM_ALIGNMENT 512
 #endif
 // Memory allocation alignment (page size is usually optimal)
 #ifndef MEM_ALIGNMENT
 #define MEM_ALIGNMENT 4096
 #endif
 // Default block size is 128 KB, current allowed range is 4K - 128M
-#define DEFAULT_DATA_BLOCK_ORDER 17
+#define DEFAULT_ORDER 17
-#define MIN_DATA_BLOCK_SIZE 4*1024
+#define MIN_BLOCK_SIZE 4*1024
-#define MAX_DATA_BLOCK_SIZE 128*1024*1024
+#define MAX_BLOCK_SIZE 128*1024*1024
 #define DEFAULT_BITMAP_GRANULARITY 4096
 #define BS_OP_MIN 1
 #define BS_OP_READ 1
 #define BS_OP_WRITE 2
-#define BS_OP_WRITE_STABLE 3
+#define BS_OP_SYNC 3
-#define BS_OP_SYNC 4
+#define BS_OP_STABLE 4
-#define BS_OP_STABLE 5
+#define BS_OP_DELETE 5
-#define BS_OP_DELETE 6
+#define BS_OP_LIST 6
-#define BS_OP_LIST 7
+#define BS_OP_ROLLBACK 7
-#define BS_OP_ROLLBACK 8
+#define BS_OP_SYNC_STAB_ALL 8
-#define BS_OP_SYNC_STAB_ALL 9
+#define BS_OP_MAX 8
 #define BS_OP_MAX 9
 #define BS_OP_PRIVATE_DATA_SIZE 256
@ -51,9 +39,9 @@
 Blockstore opcode documentation:
-## BS_OP_READ / BS_OP_WRITE / BS_OP_WRITE_STABLE
+## BS_OP_READ / BS_OP_WRITE
-Read or write object data. WRITE_STABLE writes a version that doesn't require marking as stable.
+Read or write object data.
 Input:
 - oid = requested object
@ -62,22 +50,15 @@ Input:
  - version == 0: read the last stable version,
  - version == UINT64_MAX: read the last version,
  - otherwise: read the newest version that is <= the specified version
  - reads aren't guaranteed to return data from previous unfinished writes
  For writes:
  - if version == 0, a new version is assigned automatically
  - if version != 0, it is assigned for the new write if possible, otherwise -EINVAL is returned
 - offset, len = offset and length within object. length may be zero, in that case
  read operation only returns the version / write operation only bumps the version
 - buf = pre-allocated buffer for data (read) / with data (write). may be NULL if len == 0.
 - bitmap = pointer to the new 'external' object bitmap data. Its part which is respective to the
  write request is copied into the metadata area bitwise and stored there.
 Output:
- retval = number of bytes actually read/written or negative error number
+- retval = number of bytes actually read/written or negative error number (-EINVAL or -ENOSPC)
  -EINVAL = invalid input parameters
  -ENOENT = requested object/version does not exist for reads
  -ENOSPC = no space left in the store for writes
  -EDOM = checksum error.
 - version = the version actually read or written
 ## BS_OP_DELETE
@ -111,7 +92,7 @@ Input:
 - buf = pre-allocated obj_ver_id array <len> units long
 Output:
- retval = 0 or negative error number (-ENOENT if no such version for stabilize)
+- retval = 0 or negative error number (-EINVAL)
 ## BS_OP_SYNC_STAB_ALL
@ -126,14 +107,9 @@ Output:
 Get a list of all objects in this Blockstore.
 Input:
- pg_alignment = PG alignment
+- oid.stripe = PG alignment
- pg_count = PG count or 0 to list all objects
+- len = PG count or 0 to list all objects
- pg_number = PG number
+- offset = PG number
 - list_stable_limit = max number of clean objects in the reply
  it's guaranteed that dirty objects are returned from the same interval,
  i.e. from (min_oid .. min(max_oid, max(returned stable OIDs)))
 - min_oid = min inode/stripe or 0 to list all objects
 - max_oid = max inode/stripe or 0 to list all objects
 Output:
 - retval = total obj_ver_id count
@ -150,35 +126,17 @@ struct blockstore_op_t
    uint64_t opcode;
    // finish callback
    std::function<void (blockstore_op_t*)> callback;
-    union __attribute__((__packed__))
+    object_id oid;
-    {
+    uint64_t version;
-        // R/W
+    uint32_t offset;
-        struct __attribute__((__packed__))
+    uint32_t len;
        {
            object_id oid;
            uint64_t version;
            uint32_t offset;
            uint32_t len;
        };
        // List
        struct __attribute__((__packed__))
        {
            object_id min_oid;
            object_id max_oid;
            uint32_t pg_alignment;
            uint32_t pg_count;
            uint32_t pg_number;
            uint32_t list_stable_limit;
        };
    };
    void *buf;
    void *bitmap;
    int retval;
    uint8_t private_data[BS_OP_PRIVATE_DATA_SIZE];
 };
-typedef std::map<std::string, std::string> blockstore_config_t;
+typedef std::unordered_map<std::string, std::string> blockstore_config_t;
 class blockstore_impl_t;
@ -186,12 +144,9 @@ class blockstore_t
 {
    blockstore_impl_t *impl;
 public:
-    blockstore_t(blockstore_config_t & config, ring_loop_t *ringloop, timerfd_manager_t *tfd);
+    blockstore_t(blockstore_config_t & config, ring_loop_t *ringloop);
    ~blockstore_t();
    // Update configuration
    void parse_config(blockstore_config_t & config);
    // Event loop
    void loop();
@ -210,23 +165,16 @@ public:
    // Submission
    void enqueue_op(blockstore_op_t *op);
-    // Simplified synchronous operation: get object bitmap & current version
+    // Insert operation into the beginning of the queue
-    int read_bitmap(object_id oid, uint64_t target_version, void *bitmap, uint64_t *result_version = NULL);
+    // Intended for the OSD syncer "thread" to be able to stabilize something when the journal is full
    void enqueue_op_first(blockstore_op_t *op);
-    // Get per-inode space usage statistics
+    // Unstable writes are added here (map of object_id -> version)
-    std::map<uint64_t, uint64_t> & get_inode_space_stats();
+    std::unordered_map<object_id, uint64_t> & get_unstable_writes();
    // Set per-pool no_inode_stats
    void set_no_inode_stats(const std::vector<uint64_t> & pool_ids);
    // Print diagnostics to stdout
    void dump_diagnostics();
    // FIXME rename to object_size
    uint32_t get_block_size();
    uint64_t get_block_count();
    uint64_t get_free_block_count();
-    uint64_t get_journal_size();
+    uint32_t get_disk_alignment();
    uint32_t get_bitmap_granularity();
 };
--- a/blockstore_flush.cpp
+++ b/blockstore_flush.cpp
@ -0,0 +1,707 @@
 #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;
    active_flushers = 0;
    sync_threshold = flusher_count == 1 ? 1 : flusher_count/2;
    journal_trim_interval = sync_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 || start_forced && flush_queue.size() > 0 || flush_queue.size() >= sync_threshold;
 }
 void journal_flusher_t::loop()
 {
    for (int i = 0; i < flusher_count; i++)
    {
        if (!active_flushers && (start_forced ? !flush_queue.size() : (flush_queue.size() < sync_threshold)))
        {
            return;
        }
        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);
    }
 }
 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);
    }
 }
 void journal_flusher_t::force_start()
 {
    start_forced = true;
    bs->ringloop->wakeup();
 }
 #define await_sqe(label) \
    resume_##label:\
        sqe = bs->get_sqe();\
        if (!sqe)\
        {\
            wait_state = label;\
            return false;\
        }\
        data = ((ring_data_t*)sqe->user_data);
 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->start_forced && !flusher->active_flushers && flusher->flush_queue.size() < flusher->sync_threshold)
    {
        flusher->start_forced = 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())
    {
        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:
        // Scan dirty versions of the object
        if (!scan_dirty(1))
        {
            wait_state += 1;
            return false;
        }
        if (copy_count == 0 && clean_loc == UINT64_MAX && !has_delete && !has_empty)
        {
            // Nothing to flush
            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;
        }
        // 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);
        if (clean_loc == UINT64_MAX)
        {
            if (copy_count > 0 && has_delete || 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_index, &data->iov, 1, bs->data_offset + clean_loc + it->offset
            );
            sqe->flags |= IOSQE_FIXED_FILE;
            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_index, &data->iov, 1, bs->meta_offset + meta_old.sector
            );
            sqe->flags |= IOSQE_FIXED_FILE;
            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);
            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_index, &data->iov, 1, bs->meta_offset + meta_new.sector
        );
        sqe->flags |= IOSQE_FIXED_FILE;
        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();
        // Clear unused part of the journal every <journal_trim_interval> flushes
        if (!((++flusher->journal_trim_counter) % flusher->journal_trim_interval))
        {
            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_index, &data->iov, 1, bs->journal.offset);
                sqe->flags |= IOSQE_FIXED_FILE;
                wait_count++;
            resume_13:
                if (wait_count > 0)
                {
                    wait_state = 13;
                    return false;
                }
            }
        }
        // All done
 #ifdef BLOCKSTORE_DEBUG
        printf("Flushed %lu:%lu v%lu\n", cur.oid.inode, cur.oid.stripe, cur.version);
 #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_empty = 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
            if (dirty_it->second.len == 0)
            {
                has_empty = true;
            }
            else
            {
                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_index, &data->iov, 1, bs->journal.offset + submit_offset
                            );
                            sqe->flags |= IOSQE_FIXED_FILE;
                            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
            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_index, &data->iov, 1, bs->meta_offset + wr.sector
        );
        sqe->flags |= IOSQE_FIXED_FILE;
        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++;
        if (cur_sync->ready_count >= flusher->sync_threshold || !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_index : bs->data_fd_index, IORING_FSYNC_DATASYNC);
            sqe->flags |= IOSQE_FIXED_FILE;
            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;
        }
        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
@ -0,0 +1,101 @@
 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_empty;
    spp::sparse_hash_map<object_id, clean_entry>::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
 {
    bool start_forced = false;
    int flusher_count;
    int sync_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;
    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 force_start();
    void enqueue_flush(obj_ver_id oid);
    void unshift_flush(obj_ver_id oid);
 };
--- a/blockstore_impl.cpp
+++ b/blockstore_impl.cpp
@ -0,0 +1,458 @@
 #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();
        auto cur_sync = in_progress_syncs.begin();
        while (cur_sync != in_progress_syncs.end())
        {
            continue_sync(*cur_sync++);
        }
        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);
 #ifdef BLOCKSTORE_DEBUG
                if (PRIV(op)->wait_for)
                {
                    printf("still waiting for %d\n", PRIV(op)->wait_for);
                }
 #endif
                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();
            int dequeue_op = 0;
            if (op->opcode == BS_OP_READ)
            {
                dequeue_op = dequeue_read(op);
            }
            else if (op->opcode == BS_OP_WRITE || op->opcode == BS_OP_DELETE)
            {
                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_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)
            {
                dequeue_op = dequeue_stable(op);
            }
            else if (op->opcode == BS_OP_ROLLBACK)
            {
                dequeue_op = dequeue_rollback(op);
            }
            else if (op->opcode == BS_OP_LIST)
            {
                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->get_loop_again();
        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
            return;
        }
        PRIV(op)->wait_for = 0;
    }
    else if (PRIV(op)->wait_for == WAIT_IN_FLIGHT)
    {
        auto dirty_it = dirty_db.find((obj_ver_id){
            .oid = op->oid,
            .version = PRIV(op)->wait_detail,
        });
        if (dirty_it != dirty_db.end() && IS_IN_FLIGHT(dirty_it->second.state))
        {
            // do not submit
            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
            return;
        }
        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
            return;
        }
        PRIV(op)->wait_for = 0;
    }
    else if (PRIV(op)->wait_for == WAIT_FREE)
    {
        if (!data_alloc->get_free_count() && !flusher->is_active())
        {
            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 ||
        first && op->opcode == BS_OP_WRITE)
    {
        // Basic verification not passed
        op->retval = -EINVAL;
        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 && !enqueue_write(op))
    {
        op->callback(op);
        return;
    }
    if (0 && op->opcode == BS_OP_SYNC && immediate_commit)
    {
        op->retval = 0;
        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)->sync_state = 0;
    PRIV(op)->pending_ops = 0;
    if (!first)
    {
        submit_queue.push_back(op);
    }
    else
    {
        submit_queue.push_front(op);
    }
    ringloop->wakeup();
 }
 void blockstore_impl_t::process_list(blockstore_op_t *op)
 {
    // Count objects
    uint32_t list_pg = op->offset;
    uint32_t pg_count = op->len;
    uint64_t parity_block_size = op->oid.stripe;
    if (pg_count != 0 && (parity_block_size < MIN_BLOCK_SIZE || list_pg >= pg_count))
    {
        op->retval = -EINVAL;
        FINISH_OP(op);
        return;
    }
    uint64_t stable_count = 0;
    if (pg_count > 0)
    {
        for (auto it = clean_db.begin(); it != clean_db.end(); it++)
        {
            uint32_t pg = (it->first.inode + it->first.stripe / parity_block_size) % pg_count;
            if (pg == list_pg)
            {
                stable_count++;
            }
        }
    }
    else
    {
        stable_count = clean_db.size();
    }
    uint64_t total_count = stable_count;
    for (auto it = dirty_db.begin(); it != dirty_db.end(); it++)
    {
        if (!pg_count || ((it->first.oid.inode + it->first.oid.stripe / parity_block_size) % pg_count) == list_pg)
        {
            if (IS_STABLE(it->second.state))
            {
                stable_count++;
            }
            total_count++;
        }
    }
    // Allocate memory
    op->version = stable_count;
    op->retval = total_count;
    op->buf = malloc(sizeof(obj_ver_id) * total_count);
    if (!op->buf)
    {
        op->retval = -ENOMEM;
        FINISH_OP(op);
        return;
    }
    obj_ver_id *vers = (obj_ver_id*)op->buf;
    int i = 0;
    for (auto it = clean_db.begin(); it != clean_db.end(); it++)
    {
        if (!pg_count || ((it->first.inode + it->first.stripe / parity_block_size) % pg_count) == list_pg)
        {
            vers[i++] = {
                .oid = it->first,
                .version = it->second.version,
            };
        }
    }
    int j = stable_count;
    for (auto it = dirty_db.begin(); it != dirty_db.end(); it++)
    {
        if (!pg_count || ((it->first.oid.inode + it->first.oid.stripe / parity_block_size) % pg_count) == list_pg)
        {
            if (IS_STABLE(it->second.state))
            {
                vers[i++] = it->first;
            }
            else
            {
                vers[j++] = it->first;
            }
        }
    }
    FINISH_OP(op);
 }
--- a/blockstore_impl.h
+++ b/blockstore_impl.h
@ -0,0 +1,321 @@
 #pragma once
 #include "blockstore.h"
 #include "timerfd_interval.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 "sparsepp/sparsepp/spp.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_IN_FLIGHT 1
 #define ST_J_SUBMITTED 2
 #define ST_J_WRITTEN 3
 #define ST_J_SYNCED 4
 #define ST_J_STABLE 5
 #define ST_D_IN_FLIGHT 15
 #define ST_D_SUBMITTED 16
 #define ST_D_WRITTEN 17
 #define ST_D_META_WRITTEN 19
 #define ST_D_META_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 IS_IN_FLIGHT(st) (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_META_SYNCED || st == ST_DEL_SYNCED)
 #define IS_JOURNAL(st) (st >= ST_J_SUBMITTED && st <= ST_J_STABLE)
 #define IS_BIG_WRITE(st) (st >= ST_D_SUBMITTED && st <= ST_D_STABLE)
 #define IS_DELETE(st) (st >= ST_DEL_SUBMITTED && st <= ST_DEL_STABLE)
 #define IS_UNSYNCED(st) (st >= ST_J_SUBMITTED && st <= ST_J_WRITTEN || st >= ST_D_SUBMITTED && st <= ST_D_META_WRITTEN || st >= ST_DEL_SUBMITTED && 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 version <wait_detail> of object <oid> is written
 #define WAIT_IN_FLIGHT 2
 // 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(); op->callback(op)
 struct blockstore_op_private_t
 {
    // Wait status
    int wait_for;
    uint64_t wait_detail;
    int pending_ops;
    // Read
    std::vector<fulfill_read_t> read_vec;
    // Sync, write
    uint64_t min_used_journal_sector, max_used_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 sync_state, prev_sync_count;
 };
 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;
    // Required write alignment and journal/metadata/data areas' location alignment
    uint32_t disk_alignment = 512;
    // Journal block size - minimum_io_size of the journal device is the best choice
    uint64_t journal_block_size = 512;
    // Metadata block size - minimum_io_size of the metadata device is the best choice
    uint64_t meta_block_size = 512;
    // 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;
    // 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"
    // FIXME Not implemented yet
    bool immediate_commit = false;
    bool inmemory_meta = false;
    int flusher_count;
    /******* END OF OPTIONS *******/
    struct ring_consumer_t ring_consumer;
    // Another option is https://github.com/algorithm-ninja/cpp-btree
    spp::sparse_hash_map<object_id, clean_entry> 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;
    int meta_fd_index, data_fd_index, journal_fd_index;
    void *metadata_buffer = NULL;
    struct journal_t journal;
    journal_flusher_t *flusher;
    bool live = false, queue_stall = false;
    ring_loop_t *ringloop;
    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);
    void ack_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);
    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);
    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 uint32_t get_disk_alignment() { return disk_alignment; }
 };
--- a/blockstore_init.cpp
+++ b/blockstore_init.cpp
@ -0,0 +1,698 @@
 #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_index, &data->iov, 1, bs->meta_offset + metadata_read);
            sqe->flags |= IOSQE_FIXED_FILE;
            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_index, &data->iov, 1, bs->journal.offset);
    sqe->flags |= IOSQE_FIXED_FILE;
    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_index, &data->iov, 1, bs->journal.offset);
            sqe->flags |= IOSQE_FIXED_FILE;
            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_index, IORING_FSYNC_DATASYNC);
                sqe->flags |= IOSQE_FIXED_FILE;
                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_index, &data->iov, 1, bs->journal.offset + journal_pos);
                sqe->flags |= IOSQE_FIXED_FILE;
                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_index, &data->iov, 1, bs->journal.offset + init_write_sector);
                        sqe->flags |= IOSQE_FIXED_FILE;
                        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_index, IORING_FSYNC_DATASYNC);
                            sqe->flags |= IOSQE_FIXED_FILE;
                            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();
    printf(
        "Journal entries loaded: %lu, free journal space: %lu bytes (%lu..%lu 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_SMALL_WRITE || je->type > JE_DELETE || 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 (%lu) != stored journal data offset (%lu)", 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
                    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->big_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 %lu is used by %lu:%lu v%lu\n", proc_pos, ov.oid.inode, ov.oid.stripe, ov.version);
 #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_META_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,
                };
                auto it = bs->dirty_db.find(ov);
                if (it == bs->dirty_db.end())
                {
                    // journal contains a legitimate STABLE entry for a non-existing dirty write
                    // this probably means that journal was trimmed between WRITE and STABLE entries
                    // skip it
                }
                else
                {
                    while (1)
                    {
                        it->second.state = (it->second.state == ST_D_META_SYNCED
                            ? ST_D_STABLE
                            : (it->second.state == ST_DEL_SYNCED ? ST_DEL_STABLE : ST_J_STABLE));
                        if (it == bs->dirty_db.begin())
                            break;
                        it--;
                        if (it->first.oid != ov.oid || IS_STABLE(it->second.state))
                            break;
                    }
                    bs->flusher->enqueue_flush(ov);
                }
                auto unstab_it = bs->unstable_writes.find(ov.oid);
                if (unstab_it != bs->unstable_writes.end() && unstab_it->second <= ov.version)
                {
                    bs->unstable_writes.erase(unstab_it);
                }
            }
            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>
                auto it = bs->dirty_db.lower_bound((obj_ver_id){
                    .oid = je->rollback.oid,
                    .version = UINT64_MAX,
                });
                if (it != bs->dirty_db.begin())
                {
                    uint64_t max_unstable = 0;
                    auto rm_start = it;
                    auto rm_end = it;
                    it--;
                    while (it->first.oid == je->rollback.oid &&
                        it->first.version > je->rollback.version &&
                        !IS_IN_FLIGHT(it->second.state) &&
                        !IS_STABLE(it->second.state))
                    {
                        if (it->first.oid != je->rollback.oid)
                            break;
                        else if (it->first.version <= je->rollback.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 == bs->dirty_db.begin())
                            break;
                        it--;
                    }
                    if (rm_start != rm_end)
                    {
                        bs->erase_dirty(rm_start, rm_end, UINT64_MAX);
                    }
                    auto unstab_it = bs->unstable_writes.find(je->rollback.oid);
                    if (unstab_it != bs->unstable_writes.end())
                    {
                        if (max_unstable == 0)
                            bs->unstable_writes.erase(unstab_it);
                        else
                            unstab_it->second = max_unstable;
                    }
                }
            }
            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
                // 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]++;
            }
            started = true;
            pos += je->size;
            crc32_last = je->crc32;
            entries_loaded++;
        }
    }
    bs->journal.next_free = next_free;
    return 1;
 }
--- a/src/blockstore/blockstore_init.h
+++ b/src/blockstore/blockstore_init.h
@ -1,35 +1,18 @@
 // Copyright (c) Vitaliy Filippov, 2019+
 // License: VNPL-1.1 (see README.md for details)
 #pragma once
 struct blockstore_init_meta_buf
 {
    uint8_t *buf = NULL;
    uint64_t size = 0;
    uint64_t offset = 0;
    int state = 0;
 };
 class blockstore_init_meta
 {
    blockstore_impl_t *bs;
-    int wait_state = 0;
+    int wait_state = 0, wait_count = 0;
    bool zero_on_init = false;
    void *metadata_buffer = NULL;
-    blockstore_init_meta_buf bufs[2] = {};
+    uint64_t metadata_read = 0;
-    int submitted = 0;
+    int prev = 0, prev_done = 0, done_len = 0, submitted = 0;
    uint64_t done_cnt = 0, done_pos = 0;
    uint64_t entries_loaded = 0;
    struct io_uring_sqe *sqe;
    struct ring_data_t *data;
-    uint64_t md_offset = 0;
+    void handle_entries(void *entries, unsigned count, int block_order);
-    uint64_t next_offset = 0;
+    void handle_event(ring_data_t *data);
    uint64_t last_read_offset = 0;
    uint64_t entries_loaded = 0;
    unsigned entries_per_block = 0;
    int i = 0, j = 0;
    std::vector<uint64_t> entries_to_zero;
    bool handle_meta_block(uint8_t *buf, uint64_t count, uint64_t done_cnt);
    void handle_event(ring_data_t *data, int buf_num);
 public:
    blockstore_init_meta(blockstore_impl_t *bs);
    int loop();
@ -50,8 +33,6 @@ class blockstore_init_journal
    bool started = false;
    uint64_t next_free;
    std::vector<bs_init_journal_done> done;
    std::vector<obj_ver_id> double_allocs;
    std::vector<iovec> small_write_data;
    uint64_t journal_pos = 0;
    uint64_t continue_pos = 0;
    void *init_write_buf = NULL;
@ -64,7 +45,6 @@ class blockstore_init_journal
    std::function<void(ring_data_t*)> simple_callback;
    int handle_journal_part(void *buf, uint64_t done_pos, uint64_t len);
    void handle_event(ring_data_t *data);
    void erase_dirty_object(blockstore_dirty_db_t::iterator dirty_it);
 public:
    blockstore_init_journal(blockstore_impl_t* bs);
    int loop();
--- a/blockstore_journal.cpp
+++ b/blockstore_journal.cpp
@ -0,0 +1,187 @@
 #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;
    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 required, int size, int data_after)
 {
    while (1)
    {
        int fits = (bs->journal.block_size - next_in_pos) / size;
        if (fits > 0)
        {
            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;
        if (bs->journal.sector_info[next_sector].usage_count > 0 ||
            bs->journal.sector_info[next_sector].dirty)
        {
            next_sector = ((next_sector + 1) % bs->journal.sector_count);
        }
        if (bs->journal.sector_info[next_sector].usage_count > 0 ||
            bs->journal.sector_info[next_sector].dirty)
        {
            // No memory buffer available. Wait for it.
 #ifdef BLOCKSTORE_DEBUG
            printf("next journal buffer %d is still dirty=%d used=%d\n", next_sector,
                bs->journal.sector_info[next_sector].dirty, bs->journal.sector_info[next_sector].usage_count);
 #endif
            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->force_start();
        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);
        }
        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_index, &data->iov, 1, journal.offset + journal.sector_info[cur_sector].offset
    );
    sqe->flags |= IOSQE_FIXED_FILE;
 }
 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=%lu, next_free=%lu, first_used=%lu, usage_count=%lu)\n",
        used_start, next_free,
        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 %lu (next_free=%lu)\n", used_start, next_free);
 #endif
    return true;
 }
--- a/src/blockstore/blockstore_journal.h
+++ b/src/blockstore/blockstore_journal.h
@ -1,33 +1,25 @@
 // Copyright (c) Vitaliy Filippov, 2019+
 // License: VNPL-1.1 (see README.md for details)
 #pragma once
 #include "crc32c.h"
 #include <set>
 #define MIN_JOURNAL_SIZE 4*1024*1024
 #define JOURNAL_MAGIC 0x4A33
 #define JOURNAL_VERSION_V1 1
 #define JOURNAL_VERSION_V2 2
 #define JOURNAL_BUFFER_SIZE 4*1024*1024
-#define JOURNAL_ENTRY_HEADER_SIZE 16
+
 // We reserve some extra space for future stabilize requests during writes
 #define JOURNAL_STABILIZE_RESERVATION 65536
 // Journal entries
 // Journal entries are linked to each other by their crc32 value
 // The journal is almost a blockchain, because object versions constantly increase
 #define JE_MIN         0x01
 #define JE_START       0x01
 #define JE_SMALL_WRITE 0x02
 #define JE_BIG_WRITE   0x03
 #define JE_STABLE      0x04
 #define JE_DELETE      0x05
 #define JE_ROLLBACK    0x06
 #define JE_SMALL_WRITE_INSTANT 0x07
 #define JE_BIG_WRITE_INSTANT   0x08
 #define JE_MAX         0x08
-// crc32c comes first to ease calculation
+// crc32c comes first to ease calculation and is equal to crc32()
 struct __attribute__((__packed__)) journal_entry_start
 {
    uint32_t crc32;
@ -36,13 +28,7 @@ struct __attribute__((__packed__)) journal_entry_start
    uint32_t size;
    uint32_t reserved;
    uint64_t journal_start;
    uint64_t version;
    uint32_t data_csum_type;
    uint32_t csum_block_size;
 };
 #define JE_START_V0_SIZE 24
 #define JE_START_V1_SIZE 32
 #define JE_START_V2_SIZE 40
 struct __attribute__((__packed__)) journal_entry_small_write
 {
@ -58,12 +44,7 @@ struct __attribute__((__packed__)) journal_entry_small_write
    // small_write entries contain <len> bytes of data which is stored in next sectors
    // data_offset is its offset within journal
    uint64_t data_offset;
-    uint32_t crc32_data; // zero when data_csum_type != 0
+    uint32_t crc32_data;
    // small_write and big_write entries are followed by the "external" bitmap
    // its size is dynamic and included in journal entry's <size> field
    uint8_t bitmap[];
    // and then data checksums if data_csum_type != 0
    // uint32_t data_crc32c[];
 };
 struct __attribute__((__packed__)) journal_entry_big_write
@ -78,11 +59,6 @@ struct __attribute__((__packed__)) journal_entry_big_write
    uint32_t offset;
    uint32_t len;
    uint64_t location;
    // small_write and big_write entries are followed by the "external" bitmap
    // its size is dynamic and included in journal entry's <size> field
    uint8_t bitmap[];
    // and then data checksums if data_csum_type != 0
    // uint32_t data_crc32c[];
 };
 struct __attribute__((__packed__)) journal_entry_stable
@ -148,46 +124,29 @@ inline uint32_t je_crc32(journal_entry *je)
 struct journal_sector_info_t
 {
    uint64_t offset;
-    uint64_t flush_count;
+    uint64_t usage_count;
    bool written;
    bool dirty;
    uint64_t submit_id;
 };
 struct pending_journaling_t
 {
    int pending;
    int sector;
    blockstore_op_t *op;
 };
 struct journal_t
 {
-    int fd;
+    int fd, fd_index;
    uint64_t device_size;
    bool inmemory = false;
    bool flush_journal = false;
    void *buffer = NULL;
-    uint64_t block_size;
+    uint64_t block_size = 512;
    uint64_t offset, len;
    // Next free block offset
    uint64_t next_free = 0;
    // First occupied block offset
    uint64_t used_start = 0;
    // End of the last block not used for writing anymore
    uint64_t dirty_start = 0;
    uint32_t crc32_last = 0;
    // Current sector(s) used for writing
    void *sector_buf = NULL;
    journal_sector_info_t *sector_info = NULL;
    uint64_t sector_count;
    bool no_same_sector_overwrites = false;
    int cur_sector = 0;
    int in_sector_pos = 0;
    std::vector<int> submitting_sectors;
    std::multimap<uint64_t, pending_journaling_t> flushing_ops;
    uint64_t submit_id = 0;
    // Used sector map
    // May use ~ 80 MB per 1 GB of used journal space in the worst case
@ -195,20 +154,13 @@ struct journal_t
    ~journal_t();
    bool trim();
    uint64_t get_trim_pos();
    void dump_diagnostics();
    inline bool entry_fits(int size)
    {
        return !(block_size - in_sector_pos < size ||
            no_same_sector_overwrites && sector_info[cur_sector].written);
    }
 };
 struct blockstore_journal_check_t
 {
    blockstore_impl_t *bs;
    uint64_t next_pos, next_sector, next_in_pos;
-    int sectors_to_write, first_sector;
+    int sectors_required;
    bool right_dir; // writing to the end or the beginning of the ring buffer
    blockstore_journal_check_t(blockstore_impl_t *bs);
@ -217,5 +169,4 @@ struct blockstore_journal_check_t
 journal_entry* prefill_single_journal_entry(journal_t & journal, uint16_t type, uint32_t size);
-uint32_t crc32c_pad(uint32_t prev_crc, const void *buf, size_t len, size_t left_pad, size_t right_pad);
+void prepare_journal_sector_write(journal_t & journal, int sector, io_uring_sqe *sqe, std::function<void(ring_data_t*)> cb);
 uint32_t crc32c_nopad(uint32_t prev_crc, const void *buf, size_t len, size_t left_pad, size_t right_pad);
--- a/blockstore_open.cpp
+++ b/blockstore_open.cpp
@ -0,0 +1,321 @@
 #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;
    }
    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);
    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 = 512;
    }
    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 = 512;
    }
    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 = 512;
    }
    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;
    }
    // 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()
 {
    // register fds
    data_fd_index = ringloop->register_fd(data_fd);
    meta_fd_index = meta_fd == data_fd ? data_fd_index : ringloop->register_fd(meta_fd);
    journal.fd_index = journal_fd_index = journal.fd == meta_fd ? meta_fd_index : ringloop->register_fd(journal.fd);
    // 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;
    }
    // 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));
    }
 }
 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));
        }
    }
    else
    {
        meta_fd = data_fd;
        disable_meta_fsync = disable_data_fsync;
        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, "metadata device");
    }
    else
    {
        journal.fd = meta_fd;
        disable_journal_fsync = disable_meta_fsync;
        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
@ -0,0 +1,236 @@
 #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;
    }
    if (IS_IN_FLIGHT(item_state))
    {
        // Pause until it's written somewhere
        PRIV(op)->wait_for = WAIT_IN_FLIGHT;
        PRIV(op)->wait_detail = item_version;
        return 0;
    }
    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_index : data_fd_index,
        &data->iov, 1,
        (IS_JOURNAL(item_state) ? journal.offset : data_offset) + offset
    );
    sqe->flags |= IOSQE_FIXED_FILE;
    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() && fulfilled < read_op->len)
    {
        if (!result_version)
        {
            result_version = clean_it->second.version;
        }
        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
@ -0,0 +1,187 @@
 #include "blockstore_impl.h"
 int blockstore_impl_t::dequeue_rollback(blockstore_op_t *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())
        {
        bad_op:
            op->retval = -EINVAL;
            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))
                {
                    goto bad_op;
                }
                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_used_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 This is here only for the purpose of tracking unstable_writes. Remove if not required
        // FIXME ...aaaand this is similar to blockstore_init.cpp - maybe dedup it?
        auto dirty_it = dirty_db.lower_bound((obj_ver_id){
            .oid = v->oid,
            .version = UINT64_MAX,
        });
        uint64_t max_unstable = 0;
        while (dirty_it != dirty_db.begin())
        {
            dirty_it--;
            if (dirty_it->first.oid != v->oid)
                break;
            else if (dirty_it->first.version <= v->version)
            {
                if (!IS_STABLE(dirty_it->second.state))
                    max_unstable = dirty_it->first.version;
                break;
            }
        }
        auto unstab_it = unstable_writes.find(v->oid);
        if (unstab_it != unstable_writes.end())
        {
            if (max_unstable == 0)
                unstable_writes.erase(unstab_it);
            else
                unstab_it->second = max_unstable;
        }
        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_used_journal_sector = 1 + journal.cur_sector;
            cur_sector = journal.cur_sector;
            prepare_journal_sector_write(journal, cur_sector, sqe[s++], cb);
        }
    }
    PRIV(op)->max_used_journal_sector = 1 + journal.cur_sector;
    PRIV(op)->pending_ops = s;
    return 1;
 }
 void blockstore_impl_t::handle_rollback_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);
        obj_ver_id* v;
        int i;
        for (i = 0, v = (obj_ver_id*)op->buf; i < op->len; i++, v++)
        {
            // Erase dirty_db entries
            auto rm_end = dirty_db.lower_bound((obj_ver_id){
                .oid = v->oid,
                .version = UINT64_MAX,
            });
            rm_end--;
            auto rm_start = rm_end;
            while (1)
            {
                if (rm_end->first.oid != v->oid)
                    break;
                else if (rm_end->first.version <= v->version)
                    break;
                rm_start = rm_end;
                if (rm_end == dirty_db.begin())
                    break;
                rm_end--;
            }
            if (rm_end != rm_start)
                erase_dirty(rm_start, rm_end, UINT64_MAX);
        }
        journal.trim();
        // Acknowledge op
        op->retval = 0;
        FINISH_OP(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);
        }
 #ifdef BLOCKSTORE_DEBUG
        printf("remove usage of journal offset %lu by %lu:%lu v%lu\n", dirty_it->second.journal_sector,
            dirty_it->first.oid.inode, dirty_it->first.oid.stripe, dirty_it->first.version);
 #endif
        int used = --journal.used_sectors[dirty_it->second.journal_sector];
        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
@ -0,0 +1,195 @@
 #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)
 {
    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 = -EINVAL;
                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 = EAGAIN;
            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_used_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++)
    {
        auto unstab_it = unstable_writes.find(v->oid);
        if (unstab_it != unstable_writes.end() &&
            unstab_it->second <= v->version)
        {
            unstable_writes.erase(unstab_it);
        }
        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_used_journal_sector = 1 + journal.cur_sector;
            cur_sector = journal.cur_sector;
            prepare_journal_sector_write(journal, cur_sector, sqe[s++], cb);
        }
    }
    PRIV(op)->max_used_journal_sector = 1 + journal.cur_sector;
    PRIV(op)->pending_ops = s;
    return 1;
 }
 void blockstore_impl_t::handle_stable_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);
        // 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
            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_META_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);
            }
        }
        // Acknowledge op
        op->retval = 0;
        FINISH_OP(op);
    }
 }
--- a/blockstore_sync.cpp
+++ b/blockstore_sync.cpp
@ -0,0 +1,271 @@
 #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)->sync_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)->sync_state = SYNC_HAS_BIG;
        else if (PRIV(op)->sync_small_writes.size() > 0)
            PRIV(op)->sync_state = SYNC_HAS_SMALL;
        else
            PRIV(op)->sync_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)->sync_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_used_journal_sector = PRIV(op)->max_used_journal_sector = 1 + journal.cur_sector;
            PRIV(op)->pending_ops = 1;
            PRIV(op)->sync_state = SYNC_JOURNAL_WRITE_SENT;
            return 1;
        }
        else
        {
            PRIV(op)->sync_state = SYNC_JOURNAL_WRITE_DONE;
        }
    }
    if (PRIV(op)->sync_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_index, IORING_FSYNC_DATASYNC);
            sqe->flags |= IOSQE_FIXED_FILE;
            data->iov = { 0 };
            data->callback = cb;
            PRIV(op)->min_used_journal_sector = PRIV(op)->max_used_journal_sector = 0;
            PRIV(op)->pending_ops = 1;
            PRIV(op)->sync_state = SYNC_DATA_SYNC_SENT;
            return 1;
        }
        else
        {
            PRIV(op)->sync_state = SYNC_DATA_SYNC_DONE;
        }
    }
    if (PRIV(op)->sync_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_used_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 %lu is used by %lu:%lu v%lu\n", dirty_db[*it].journal_sector, it->oid.inode, it->oid.stripe, it->version);
 #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_used_journal_sector = 1 + journal.cur_sector;
                cur_sector = journal.cur_sector;
                prepare_journal_sector_write(journal, cur_sector, sqe[s++], cb);
            }
        }
        PRIV(op)->max_used_journal_sector = 1 + journal.cur_sector;
        PRIV(op)->pending_ops = s;
        PRIV(op)->sync_state = SYNC_JOURNAL_WRITE_SENT;
        return 1;
    }
    if (PRIV(op)->sync_state == SYNC_JOURNAL_WRITE_DONE)
    {
        if (!disable_journal_fsync)
        {
            BS_SUBMIT_GET_SQE(sqe, data);
            my_uring_prep_fsync(sqe, journal_fd_index, IORING_FSYNC_DATASYNC);
            sqe->flags |= IOSQE_FIXED_FILE;
            data->iov = { 0 };
            data->callback = cb;
            PRIV(op)->pending_ops = 1;
            PRIV(op)->sync_state = SYNC_JOURNAL_SYNC_SENT;
            return 1;
        }
        else
        {
            PRIV(op)->sync_state = SYNC_DONE;
        }
    }
    if (PRIV(op)->sync_state == SYNC_DONE)
    {
        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)->sync_state == SYNC_DATA_SYNC_SENT)
        {
            PRIV(op)->sync_state = SYNC_DATA_SYNC_DONE;
        }
        else if (PRIV(op)->sync_state == SYNC_JOURNAL_WRITE_SENT)
        {
            PRIV(op)->sync_state = SYNC_JOURNAL_WRITE_DONE;
        }
        else if (PRIV(op)->sync_state == SYNC_JOURNAL_SYNC_SENT)
        {
            PRIV(op)->sync_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)->sync_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)->sync_state == SYNC_DONE)
            {
                done_syncs++;
                // Acknowledge next_sync
                ack_one_sync(next_sync);
            }
        }
        return 1;
    }
    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;
        dirty_db[*it].state = ST_D_META_SYNCED;
    }
    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;
        dirty_db[*it].state = dirty_db[*it].state == ST_DEL_WRITTEN ? ST_DEL_SYNCED : 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
@ -0,0 +1,330 @@
 #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);
    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);
        }
    }
    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 = -EINVAL;
        return false;
    }
    if (deleted && is_del)
    {
        // Already deleted
        op->retval = 0;
        return false;
    }
    // Immediately add the operation into dirty_db, so subsequent reads could see it
 #ifdef BLOCKSTORE_DEBUG
    printf("%s %lu:%lu v%lu\n", is_del ? "Delete" : "Write", op->oid.inode, op->oid.stripe, op->version);
 #endif
    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 : 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)
 {
    auto dirty_it = dirty_db.find((obj_ver_id){
        .oid = op->oid,
        .version = op->version,
    });
    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_index, PRIV(op)->iov_zerofill, vcnt, data_offset + (loc << block_order) + op->offset - stripe_offset
        );
        sqe->flags |= IOSQE_FIXED_FILE;
        PRIV(op)->pending_ops = 1;
        PRIV(op)->min_used_journal_sector = PRIV(op)->max_used_journal_sector = 0;
        // Remember big write as unsynced
        unsynced_big_writes.push_back((obj_ver_id){
            .oid = op->oid,
            .version = op->version,
        });
    }
    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 ((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
            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 (sqe1)
        {
            prepare_journal_sector_write(journal, journal.cur_sector, sqe1, cb);
            // FIXME rename to min/max _flushing
            PRIV(op)->min_used_journal_sector = PRIV(op)->max_used_journal_sector = 1 + journal.cur_sector;
            PRIV(op)->pending_ops++;
        }
        else
        {
            PRIV(op)->min_used_journal_sector = PRIV(op)->max_used_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 %lu is used by %lu:%lu v%lu\n", dirty_it->second.journal_sector, dirty_it->first.oid.inode, dirty_it->first.oid.stripe, dirty_it->first.version);
 #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 (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_index, &data2->iov, 1, journal.offset + journal.next_free
            );
            sqe2->flags |= IOSQE_FIXED_FILE;
            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;
        }
        // Remember small write as unsynced
        unsynced_small_writes.push_back((obj_ver_id){
            .oid = op->oid,
            .version = op->version,
        });
        if (!PRIV(op)->pending_ops)
        {
            ack_write(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)
    {
        // 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);
        ack_write(op);
    }
 }
 void blockstore_impl_t::release_journal_sectors(blockstore_op_t *op)
 {
    // Release used journal sectors
    if (PRIV(op)->min_used_journal_sector > 0 &&
        PRIV(op)->max_used_journal_sector > 0)
    {
        uint64_t s = PRIV(op)->min_used_journal_sector;
        while (1)
        {
            journal.sector_info[s-1].usage_count--;
            if (s == PRIV(op)->max_used_journal_sector)
                break;
            s = 1 + s % journal.sector_count;
        }
        PRIV(op)->min_used_journal_sector = PRIV(op)->max_used_journal_sector = 0;
    }
 }
 void blockstore_impl_t::ack_write(blockstore_op_t *op)
 {
    // Switch object state
    auto & dirty_entry = dirty_db[(obj_ver_id){
        .oid = op->oid,
        .version = op->version,
    }];
 #ifdef BLOCKSTORE_DEBUG
    printf("Ack write %lu:%lu v%lu = %d\n", op->oid.inode, op->oid.stripe, op->version, dirty_entry.state);
 #endif
    if (dirty_entry.state == ST_J_SUBMITTED)
    {
        dirty_entry.state = ST_J_WRITTEN;
    }
    else if (dirty_entry.state == ST_D_SUBMITTED)
    {
        dirty_entry.state = ST_D_WRITTEN;
    }
    else if (dirty_entry.state == ST_DEL_SUBMITTED)
    {
        dirty_entry.state = ST_DEL_WRITTEN;
    }
    // Acknowledge write without sync
    op->retval = op->len;
    FINISH_OP(op);
 }
 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,
    });
    blockstore_journal_check_t space_check(this);
    if (!space_check.check_available(op, 1, sizeof(journal_entry_del), 0))
    {
        return 0;
    }
    BS_SUBMIT_GET_ONLY_SQE(sqe);
    // Prepare journal sector write
    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 %lu is used by %lu:%lu v%lu\n", dirty_it->second.journal_sector, dirty_it->first.oid.inode, dirty_it->first.oid.stripe, dirty_it->first.version);
 #endif
    je->oid = op->oid;
    je->version = op->version;
    je->crc32 = je_crc32((journal_entry*)je);
    journal.crc32_last = je->crc32;
    auto cb = [this, op](ring_data_t *data) { handle_write_event(data, op); };
    prepare_journal_sector_write(journal, journal.cur_sector, sqe, cb);
    PRIV(op)->min_used_journal_sector = PRIV(op)->max_used_journal_sector = 1 + journal.cur_sector;
    PRIV(op)->pending_ops = 1;
    dirty_it->second.state = ST_DEL_SUBMITTED;
    // Remember small write as unsynced
    unsynced_small_writes.push_back((obj_ver_id){
        .oid = op->oid,
        .version = op->version,
    });
    return 1;
 }
--- a/copy-fio-includes.sh
+++ b/copy-fio-includes.sh
@ -1,13 +0,0 @@
 #!/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
@ -1,18 +0,0 @@
 #!/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
@ -1 +0,0 @@
 Subproject commit 8de8b467acbca50cfd8835c20e0e379110f3b32b
--- a/src/util/crc32c.c
+++ b/src/util/crc32c.c
--- a/src/util/crc32c.h
+++ b/src/util/crc32c.h
@ -8,10 +8,4 @@
 // unsigned __int64 _mm_crc32_u64 (unsigned __int64 crc, unsigned __int64 v)
 // unsigned int _mm_crc32_u8 (unsigned int crc, unsigned char v)
 #ifdef __cplusplus
 extern "C" {
 #endif
 uint32_t crc32c(uint32_t crc, const void *buf, size_t len);
 #ifdef __cplusplus
 };
 #endif
--- a/csi/.dockerignore
+++ b/csi/.dockerignore
@ -1,2 +0,0 @@
 vitastor-csi
 Dockerfile
--- a/csi/Dockerfile
+++ b/csi/Dockerfile
@ -1,50 +0,0 @@
 # Compile stage
 FROM golang:bookworm AS build
 ADD go.sum go.mod /app/
 RUN cd /app; CGO_ENABLED=1 GOOS=linux GOARCH=amd64 go mod download -x
 ADD . /app
 RUN perl -i -e '$/ = undef; while(<>) { s/\n\s*(\{\s*\n)/$1\n/g; s/\}(\s*\n\s*)else\b/$1} else/g; print; }' `find /app -name '*.go'` && \
    cd /app && \
    CGO_ENABLED=1 GOOS=linux GOARCH=amd64 go build -o vitastor-csi
 # Final stage
 FROM debian:bookworm
 LABEL maintainers="Vitaliy Filippov <vitalif@yourcmc.ru>"
 LABEL description="Vitastor CSI Driver"
 ENV NODE_ID=""
 ENV CSI_ENDPOINT=""
 RUN apt-get update && \
    apt-get install -y wget && \
    (echo "APT::Install-Recommends false;" > /etc/apt/apt.conf) && \
    apt-get update && \
    apt-get install -y e2fsprogs xfsprogs kmod iproute2 \
        # NFS mount dependencies
        nfs-common netbase \
        # dependencies of qemu-storage-daemon
        libnuma1 liburing2 libglib2.0-0 libfuse3-3 libaio1 libzstd1 libnettle8 \
        libgmp10 libhogweed6 libp11-kit0 libidn2-0 libunistring2 libtasn1-6 libpcre2-8-0 libffi8 && \
    apt-get clean && \
    (echo options nbd nbds_max=128 > /etc/modprobe.d/nbd.conf)
 COPY --from=build /app/vitastor-csi /bin/
 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
@ -1,9 +0,0 @@
 VITASTOR_VERSION ?= v1.10.0
 all: build push
 build:
 	@docker build --rm -t vitalif/vitastor-csi:$(VITASTOR_VERSION) .
 push:
 	@docker push vitalif/vitastor-csi:$(VITASTOR_VERSION)
--- a/csi/deploy/000-csi-namespace.yaml
+++ b/csi/deploy/000-csi-namespace.yaml
@ -1,5 +0,0 @@
 ---
 apiVersion: v1
 kind: Namespace
 metadata:
  name: vitastor-system
--- a/csi/deploy/001-csi-config-map.yaml
+++ b/csi/deploy/001-csi-config-map.yaml
@ -1,10 +0,0 @@
 ---
 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
@ -1,37 +0,0 @@
 ---
 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
@ -1,72 +0,0 @@
 ---
 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
@ -1,145 +0,0 @@
 ---
 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:v1.10.0
          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
@ -1,105 +0,0 @@
 ---
 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
@ -1,60 +0,0 @@
 ---
 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
@ -1,164 +0,0 @@
 ---
 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:v1.10.0
          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
@ -1,11 +0,0 @@
 ---
 # 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
@ -1,25 +0,0 @@
 ---
 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:
  # CSI driver can create block-based volumes and VitastorFS-based volumes
  # only VitastorFS-based volumes and raw block volumes (without FS) support ReadWriteMany mode
  # set this parameter to VitastorFS metadata volume name to use VitastorFS
  # if unset, block-based volumes will be created
  vitastorfs: ""
  # for block-based storage classes, pool ID may be either a string (name) or a number (ID)
  # for vitastorFS-based storage classes it must be a string - name of the default pool for FS data
  poolId: "testpool"
  # volume name prefix for block-based storage classes or NFS subdirectory (including /) for FS-based volumes
  volumePrefix: ""
  # 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
@ -1,13 +0,0 @@
 ---
 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
@ -1,12 +0,0 @@
 ---
 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
@ -1,7 +0,0 @@
 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
@ -1,16 +0,0 @@
 ---
 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
@ -1,8 +0,0 @@
 apiVersion: snapshot.storage.k8s.io/v1
 kind: VolumeSnapshot
 metadata:
  name: snap1
 spec:
  volumeSnapshotClassName: vitastor-snapclass
  source:
    persistentVolumeClaimName: test-vitastor-pvc
--- a/csi/deploy/example-storage-class-fs.yaml
+++ b/csi/deploy/example-storage-class-fs.yaml
@ -1,25 +0,0 @@
 ---
 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:
  # CSI driver can create block-based volumes and VitastorFS-based volumes
  # only VitastorFS-based volumes and raw block volumes (without FS) support ReadWriteMany mode
  # set this parameter to VitastorFS metadata volume name to use VitastorFS
  # if unset, block-based volumes will be created
  vitastorfs: "testfs"
  # for block-based storage classes, pool ID may be either a string (name) or a number (ID)
  # for vitastorFS-based storage classes it must be a string - name of the default pool for FS data
  poolId: "testpool"
  # volume name prefix for block-based storage classes or NFS subdirectory (including /) for FS-based volumes
  volumePrefix: "k8s/"
  # 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-test-pod-block.yaml
+++ b/csi/deploy/example-test-pod-block.yaml
@ -1,17 +0,0 @@
 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
@ -1,17 +0,0 @@
 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
@ -1,21 +0,0 @@
 module vitastor.io/csi
 go 1.15
 require (
 	github.com/container-storage-interface/spec v1.8.0
 	github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b
 	github.com/kubernetes-csi/csi-lib-utils v0.9.1
 	golang.org/x/net v0.7.0
 	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
@ -1,383 +0,0 @@
 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=
 github.com/Azure/go-autorest/autorest v0.9.0/go.mod h1:xyHB1BMZT0cuDHU7I0+g046+BFDTQ8rEZB0s4Yfa6bI=
 github.com/Azure/go-autorest/autorest v0.9.6/go.mod h1:/FALq9T/kS7b5J5qsQ+RSTUdAmGFqi0vUdVNNx8q630=
 github.com/Azure/go-autorest/autorest/adal v0.5.0/go.mod h1:8Z9fGy2MpX0PvDjB1pEgQTmVqjGhiHBW7RJJEciWzS0=
 github.com/Azure/go-autorest/autorest/adal v0.8.2/go.mod h1:ZjhuQClTqx435SRJ2iMlOxPYt3d2C/T/7TiQCVZSn3Q=
 github.com/Azure/go-autorest/autorest/date v0.1.0/go.mod h1:plvfp3oPSKwf2DNjlBjWF/7vwR+cUD/ELuzDCXwHUVA=
 github.com/Azure/go-autorest/autorest/date v0.2.0/go.mod h1:vcORJHLJEh643/Ioh9+vPmf1Ij9AEBM5FuBIXLmIy0g=
 github.com/Azure/go-autorest/autorest/mocks v0.1.0/go.mod h1:OTyCOPRA2IgIlWxVYxBee2F5Gr4kF2zd2J5cFRaIDN0=
 github.com/Azure/go-autorest/autorest/mocks v0.2.0/go.mod h1:OTyCOPRA2IgIlWxVYxBee2F5Gr4kF2zd2J5cFRaIDN0=
 github.com/Azure/go-autorest/autorest/mocks v0.3.0/go.mod h1:a8FDP3DYzQ4RYfVAxAN3SVSiiO77gL2j2ronKKP0syM=
 github.com/Azure/go-autorest/logger v0.1.0/go.mod h1:oExouG+K6PryycPJfVSxi/koC6LSNgds39diKLz7Vrc=
 github.com/Azure/go-autorest/tracing v0.5.0/go.mod h1:r/s2XiOKccPW3HrqB+W0TQzfbtp2fGCgRFtBroKn4Dk=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/NYTimes/gziphandler v0.0.0-20170623195520-56545f4a5d46/go.mod h1:3wb06e3pkSAbeQ52E9H9iFoQsEEwGN64994WTCIhntQ=
 github.com/PuerkitoBio/purell v1.0.0/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
 github.com/PuerkitoBio/urlesc v0.0.0-20160726150825-5bd2802263f2/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
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--- a/csi/src/config.go
+++ b/csi/src/config.go
@ -1,22 +0,0 @@
 // 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 = "1.10.0"
 )
 // 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
@ -1,698 +0,0 @@
 // 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"
    "time"
    "os"
    "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"
    }
    ctxVars["configPath"] = configPath
    if (params["vitastorfs"] != "")
    {
        ctxVars["vitastorfs"] = params["vitastorfs"]
    }
    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 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")
    }
    ctxVars, err := GetConnectionParams(req.Parameters)
    if (err != nil)
    {
        return nil, err
    }
    err = cs.checkCaps(volumeCapabilities, ctxVars["vitastorfs"] != "")
    if (err != nil)
    {
        return nil, err
    }
    pool := req.Parameters["poolId"]
    if (pool == "")
    {
        return nil, status.Error(codes.InvalidArgument, "poolId is missing in storage class configuration")
    }
    volumePrefix := req.Parameters["volumePrefix"]
    if (volumePrefix == "")
    {
        // Old name
        volumePrefix = req.Parameters["etcdVolumePrefix"]
    }
    volName := volumePrefix + req.GetName()
    volSize := 1 * GB
    if capRange := req.GetCapacityRange(); capRange != nil
    {
        volSize = ((capRange.GetRequiredBytes() + MB - 1) / MB) * MB
    }
    if (ctxVars["vitastorfs"] != "")
    {
        // Nothing to create, subdirectories are created during mounting
        // FIXME: It would be cool to support quotas some day and set it here
        if (req.VolumeContentSource.GetSnapshot() != nil)
        {
            return nil, status.Error(codes.InvalidArgument, "VitastorFS doesn't support snapshots")
        }
        ctxVars["name"] = volName
        ctxVars["pool"] = pool
        volumeIdJson, _ := json.Marshal(ctxVars)
        return &csi.CreateVolumeResponse{
            Volume: &csi.Volume{
                // Ugly, but VolumeContext isn't passed to DeleteVolume :-(
                VolumeId: string(volumeIdJson),
                CapacityBytes: volSize,
            },
        }, nil
    }
    args := []string{ "create", volName, "-s", fmt.Sprintf("%v", volSize), "--pool", pool }
    // 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
    }
    if (ctxVars["vitastorfs"] != "")
    {
        // FIXME: Delete FS subdirectory
        return &csi.DeleteVolumeResponse{}, nil
    }
    _, 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")
    }
    volVars := make(map[string]string)
    err := json.Unmarshal([]byte(volumeID), &volVars)
    if (err != nil)
    {
        return nil, status.Error(codes.Internal, "volume ID not in JSON format")
    }
    ctxVars, err := GetConnectionParams(volVars)
    if (err != nil)
    {
        return nil, err
    }
    volumeCapabilities := req.GetVolumeCapabilities()
    if (volumeCapabilities == nil)
    {
        return nil, status.Error(codes.InvalidArgument, "volumeCapabilities is nil")
    }
    err = cs.checkCaps(volumeCapabilities, ctxVars["vitastorfs"] != "")
    if (err != nil)
    {
        return nil, err
    }
    return &csi.ValidateVolumeCapabilitiesResponse{
        Confirmed: &csi.ValidateVolumeCapabilitiesResponse_Confirmed{
            VolumeCapabilities: req.VolumeCapabilities,
        },
    }, nil
 }
 func (cs *ControllerServer) checkCaps(volumeCapabilities []*csi.VolumeCapability, fs bool) error
 {
    var volumeCapabilityAccessModes []*csi.VolumeCapability_AccessMode
    for _, mode := range []csi.VolumeCapability_AccessMode_Mode{
        csi.VolumeCapability_AccessMode_SINGLE_NODE_WRITER,
        csi.VolumeCapability_AccessMode_SINGLE_NODE_READER_ONLY,
        csi.VolumeCapability_AccessMode_MULTI_NODE_READER_ONLY,
        csi.VolumeCapability_AccessMode_SINGLE_NODE_SINGLE_WRITER,
        csi.VolumeCapability_AccessMode_SINGLE_NODE_MULTI_WRITER,
    } {
        volumeCapabilityAccessModes = append(volumeCapabilityAccessModes, &csi.VolumeCapability_AccessMode{Mode: mode})
    }
    for _, capability := range volumeCapabilities
    {
        if (capability.GetBlock() != nil)
        {
            if (fs)
            {
                return status.Errorf(codes.InvalidArgument, "%v not supported with FS-based volumes", capability)
            }
            for _, mode := range []csi.VolumeCapability_AccessMode_Mode{
                csi.VolumeCapability_AccessMode_MULTI_NODE_SINGLE_WRITER,
                csi.VolumeCapability_AccessMode_MULTI_NODE_MULTI_WRITER,
            } {
                volumeCapabilityAccessModes = append(volumeCapabilityAccessModes, &csi.VolumeCapability_AccessMode{Mode: mode})
            }
            break
        }
    }
    if (fs)
    {
        // All access modes including RWX are supported with FS-based volumes
        return nil
    }
    capabilitySupport := false
    for _, capability := range volumeCapabilities
    {
        for _, volumeCapabilityAccessMode := range volumeCapabilityAccessModes
        {
            if (volumeCapabilityAccessMode.Mode == capability.AccessMode.Mode)
            {
                capabilitySupport = true
            }
        }
    }
    if (!capabilitySupport)
    {
        return status.Errorf(codes.InvalidArgument, "%v not supported", volumeCapabilities)
    }
    return 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")
    }
    if (ctxVars["vitastorfs"] != "")
    {
        return nil, status.Error(codes.InvalidArgument, "VitastorFS doesn't support snapshots")
    }
    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
    }
    if (ctxVars["vitastorfs"] != "")
    {
        return nil, status.Error(codes.InvalidArgument, "VitastorFS doesn't support snapshots")
    }
    _, 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
    }
    if (ctxVars["vitastorfs"] != "")
    {
        return nil, status.Error(codes.InvalidArgument, "VitastorFS doesn't support snapshots")
    }
    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
    }
    if (ctxVars["vitastorfs"] != "")
    {
        // Nothing to change
        // FIXME: Support quotas and change quota here
        return &csi.ControllerExpandVolumeResponse{
            CapacityBytes: req.CapacityRange.RequiredBytes,
            NodeExpansionRequired: false,
        }, nil
    }
    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
@ -1,137 +0,0 @@
 /*
 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
@ -1,67 +0,0 @@
 // 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
@ -1,967 +0,0 @@
 // Copyright (c) Vitaliy Filippov, 2019+
 // License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
 package vitastor
 import (
    "context"
    "crypto/sha1"
    "encoding/hex"
    "encoding/json"
    "fmt"
    "os"
    "os/exec"
    "path/filepath"
    "regexp"
    "strconv"
    "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
    nfsStageDir     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"`
 }
 type NfsState struct
 {
    ConfigPath string `json:"configPath"`
    FsName     string `json:"fsName"`
    Pool       string `json:"pool"`
    Path       string `json:"path"`
    Port       int    `json:"port"`
 }
 // 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 += "/"
    }
    nfsStageDir := os.Getenv("NFS_STAGE_DIR")
    if (nfsStageDir == "")
    {
        nfsStageDir = "/var/lib/kubelet/plugins/csi.vitastor.io/nfs"
    }
    ns := &NodeServer{
        Driver:      driver,
        useVduse:    checkVduseSupport(),
        stateDir:    stateDir,
        nfsStageDir: nfsStageDir,
        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"
    stateFiles, err := filepath.Glob(pattern)
    if (err != nil)
    {
        klog.Errorf("failed to list %s: %v", pattern, err)
    }
    if (len(stateFiles) == 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 stateFiles
    {
        ns.checkVduseState(stateFile, devs)
    }
 }
 func (ns *NodeServer) checkVduseState(stateFile string, devs map[string]interface{})
 {
    // Check if VDPA device is still added to the bus
    vdpaId := filepath.Base(stateFile)
    vdpaId = vdpaId[0:len(vdpaId)-5]
    if (devs[vdpaId] == nil)
    {
        // Unused, clean it up
        unmapVduseById(ns.stateDir, vdpaId)
        return
    }
    // Read state file
    stateJSON, err := os.ReadFile(stateFile)
    if (err != nil)
    {
        klog.Warningf("error reading state file %v: %v", stateFile, err)
        return
    }
    var state DeviceState
    err = json.Unmarshal(stateJSON, &state)
    if (err != nil)
    {
        klog.Warningf("state file %v contains invalid JSON (error %v): %v", stateFile, err, string(stateJSON))
        return
    }
    // Lock volume
    ns.lockVolume(state.ConfigPath+":block:"+state.Image)
    defer ns.unlockVolume(state.ConfigPath+":block:"+state.Image)
    // Recheck state file after locking
    _, err = os.ReadFile(stateFile)
    if (err != nil)
    {
        klog.Warningf("state file %v disappeared, skipping volume", stateFile)
        return
    }
    // Check if the 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)
        err = startStorageDaemon(vdpaId, state.Image, pidFile, state.ConfigPath, state.Readonly)
        if (err != nil)
        {
            klog.Warningf("failed to restart storage daemon for volume %v: %v", state.Image, err)
        }
    }
 }
 func (ns *NodeServer) restoreNfsDaemons()
 {
    pattern := ns.stateDir+"vitastor-nfs-*.json"
    stateFiles, err := filepath.Glob(pattern)
    if (err != nil)
    {
        klog.Errorf("failed to list %s: %v", pattern, err)
    }
    if (len(stateFiles) == 0)
    {
        return
    }
    activeNFS, err := ns.listActiveNFS()
    if (err != nil)
    {
        return
    }
    // Check all state files and try to restore active mounts
    for _, stateFile := range stateFiles
    {
        ns.checkNfsState(stateFile, activeNFS)
    }
 }
 func (ns *NodeServer) readNfsState(stateFile string, allowNotExists bool) (*NfsState, error)
 {
    stateJSON, err := os.ReadFile(stateFile)
    if (err != nil)
    {
        if (allowNotExists && os.IsNotExist(err))
        {
            return nil, nil
        }
        klog.Warningf("error reading state file %v: %v", stateFile, err)
        return nil, err
    }
    var state NfsState
    err = json.Unmarshal(stateJSON, &state)
    if (err != nil)
    {
        klog.Warningf("state file %v contains invalid JSON (error %v): %v", stateFile, err, string(stateJSON))
        return nil, err
    }
    return &state, nil
 }
 func (ns *NodeServer) checkNfsState(stateFile string, activeNfs map[int][]string)
 {
    // Read state file
    state, err := ns.readNfsState(stateFile, false)
    if (err != nil)
    {
        return
    }
    // Lock FS
    ns.lockVolume(state.ConfigPath+":fs:"+state.FsName)
    defer ns.unlockVolume(state.ConfigPath+":fs:"+state.FsName)
    // Check if NFS at this port is still mounted
    pidFile := ns.stateDir + filepath.Base(stateFile)
    pidFile = pidFile[0:len(pidFile)-5] + ".pid"
    if (len(activeNfs[state.Port]) == 0)
    {
        // this is a stale state file, remove it
        klog.Warningf("state file %v contains stale mount at port %d, removing it", stateFile, state.Port)
        ns.stopNFS(stateFile, pidFile)
        return
    }
    // Check PID file
    exists := false
    proc, err := findByPidFile(pidFile)
    if (err == nil)
    {
        exists = proc.Signal(syscall.Signal(0)) == nil
    }
    if (!exists)
    {
        // Restart vitastor-nfs server
        klog.Warningf("restarting NFS server for FS %v at port %v", state.FsName, state.Port)
        _, _, err := system(
            "/usr/bin/vitastor-nfs", "start",
            "--pidfile", pidFile,
            "--bind", "127.0.0.1",
            "--port", fmt.Sprintf("%d", state.Port),
            "--fs", state.FsName,
            "--pool", state.Pool,
            "--portmap", "0",
        )
        if (err != nil)
        {
            klog.Warningf("failed to restart NFS server for FS %v: %v", state.FsName, err)
        }
    }
 }
 // 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"]
    if (ctxVars["vitastorfs"] != "")
    {
        return &csi.NodeStageVolumeResponse{}, nil
    }
    ns.lockVolume(ctxVars["configPath"]+":block:"+volName)
    defer ns.unlockVolume(ctxVars["configPath"]+":block:"+volName)
    targetPath := req.GetStagingTargetPath()
    isBlock := req.GetVolumeCapability().GetBlock() != nil
    // Check that it's not already mounted
    notmnt, err := mount.IsNotMountPoint(ns.mounter, targetPath)
    if (err == nil)
    {
        if (!notmnt)
        {
            klog.Errorf("target path %s is already mounted", targetPath)
            return nil, fmt.Errorf("target path %s is already mounted", targetPath)
        }
        var finfo os.FileInfo
        finfo, err = os.Stat(targetPath)
        if (err != nil)
        {
            klog.Errorf("failed to stat %s: %v", targetPath, err)
            return nil, err
        }
        if (finfo.IsDir() != (!isBlock))
        {
            err = os.Remove(targetPath)
            if (err != nil)
            {
                klog.Errorf("failed to remove %s (to recreate it with correct type): %v", targetPath, err)
                return nil, err
            }
            err = os.ErrNotExist
        }
    }
    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)
    {
        klog.Infof("bind-mounting %s to %s", devicePath, targetPath)
        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)
        {
            switch fsType
            {
                case "ext4":
                    args := []string{"-m0", "-Enodiscard,lazy_itable_init=1,lazy_journal_init=1", devicePath}
                    _, err = systemCombined("mkfs.ext4", args...)
                case "xfs":
                    _, err = systemCombined("mkfs.xfs", "-K", devicePath)
            }
            if (err != nil)
            {
                goto unmap
            }
        }
        klog.Infof("formatting and mounting %s to %s with FS %s, options: %v", devicePath, targetPath, fsType, opt)
        err = diskMounter.FormatAndMount(devicePath, targetPath, fsType, opt)
        if (err == nil)
        {
            klog.Infof("successfully mounted %s to %s", devicePath, targetPath)
        }
        // Try to run online resize on mount.
        // FIXME: Implement online resize. It requires online resize support in vitastor-nbd.
        if (err == nil && existingFormat != "" && !readOnly)
        {
            switch (fsType)
            {
                case "ext4":
                    _, err = systemCombined("resize2fs", devicePath)
                case "xfs":
                    _, err = systemCombined("xfs_growfs", devicePath)
            }
            if (err != nil)
            {
                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"]
    if (ctxVars["vitastorfs"] != "")
    {
        return &csi.NodeUnstageVolumeResponse{}, nil
    }
    ns.lockVolume(ctxVars["configPath"]+":block:"+volName)
    defer ns.unlockVolume(ctxVars["configPath"]+":block:"+volName)
    targetPath := req.GetStagingTargetPath()
    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.NodeUnstageVolumeResponse{}, nil
    }
    refList, err := ns.mounter.GetMountRefs(targetPath)
    if (err != nil)
    {
        return nil, err
    }
    if (len(refList) > 0)
    {
        klog.Warningf("%s is still referenced: %v", targetPath, refList)
    }
    // unmount
    err = mount.CleanupMountPoint(targetPath, ns.mounter, false)
    if (err != nil)
    {
        return nil, err
    }
    // unmap device
    if (len(refList) == 0)
    {
        if (!ns.useVduse)
        {
            unmapNbd(devicePath)
        }
        else
        {
            unmapVduse(ns.stateDir, devicePath)
        }
    }
    return &csi.NodeUnstageVolumeResponse{}, nil
 }
 // Mount or check if NFS is already mounted
 func (ns *NodeServer) mountNFS(ctxVars map[string]string) (string, error)
 {
    sum := sha1.Sum([]byte(ctxVars["configPath"]+":fs:"+ctxVars["vitastorfs"]))
    nfsHash := hex.EncodeToString(sum[:])
    stateFile := ns.stateDir+"vitastor-nfs-"+nfsHash+".json"
    pidFile := ns.stateDir+"vitastor-nfs-"+nfsHash+".pid"
    mountPath := ns.nfsStageDir+"/"+nfsHash
    state, err := ns.readNfsState(stateFile, true)
    if (state != nil)
    {
        return state.Path, nil
    }
    if (err != nil)
    {
        return "", err
    }
    err = os.MkdirAll(mountPath, 0777)
    if (err != nil)
    {
        return "", err
    }
    // Create a new mount
    state = &NfsState{
        ConfigPath: ctxVars["configPath"],
        FsName:     ctxVars["vitastorfs"],
        Pool:       ctxVars["pool"],
        Path:       mountPath,
    }
    klog.Infof("starting new NFS server for FS %v", state.FsName)
    stdout, _, err := system(
        "/usr/bin/vitastor-nfs", "start",
        "--pidfile", pidFile,
        "--bind", "127.0.0.1",
        "--port", "auto",
        "--fs", state.FsName,
        "--pool", state.Pool,
        "--portmap", "0",
    )
    if (err != nil)
    {
        return "", err
    }
    match := regexp.MustCompile("Port: (\\d+)").FindStringSubmatch(string(stdout))
    if (match == nil)
    {
        klog.Errorf("failed to find port in vitastor-nfs output: %v", string(stdout))
        ns.stopNFS(stateFile, pidFile)
        return "", fmt.Errorf("failed to find port in vitastor-nfs output (bad vitastor-nfs version?)")
    }
    port, _ := strconv.ParseUint(match[1], 0, 16)
    state.Port = int(port)
    // Write state file
    stateJSON, _ := json.Marshal(state)
    err = os.WriteFile(stateFile, stateJSON, 0600)
    if (err != nil)
    {
        klog.Errorf("failed to write state file %v", stateFile)
        ns.stopNFS(stateFile, pidFile)
        return "", err
    }
    // Mount NFS
    _, _, err = system(
        "mount", "-t", "nfs", "127.0.0.1:/", state.Path,
        "-o", fmt.Sprintf("port=%d,mountport=%d,nfsvers=3,soft,nolock,tcp", port, port),
    )
    if (err != nil)
    {
        ns.stopNFS(stateFile, pidFile)
        return "", err
    }
    return state.Path, nil
 }
 // Mount or check if NFS is already mounted
 func (ns *NodeServer) checkStopNFS(ctxVars map[string]string)
 {
    sum := sha1.Sum([]byte(ctxVars["configPath"]+":fs:"+ctxVars["vitastorfs"]))
    nfsHash := hex.EncodeToString(sum[:])
    stateFile := ns.stateDir+"vitastor-nfs-"+nfsHash+".json"
    pidFile := ns.stateDir+"vitastor-nfs-"+nfsHash+".pid"
    mountPath := ns.nfsStageDir+"/"+nfsHash
    state, err := ns.readNfsState(stateFile, true)
    if (state == nil)
    {
        return
    }
    activeNFS, err := ns.listActiveNFS()
    if (err != nil)
    {
        return
    }
    if (len(activeNFS[state.Port]) > 0)
    {
        return
    }
    // All volume mounts are detached, unmount the root mount and kill the server
    err = mount.CleanupMountPoint(mountPath, ns.mounter, false)
    if (err != nil)
    {
        klog.Errorf("failed to unmount %v: %v", mountPath, err)
        return
    }
    ns.stopNFS(stateFile, pidFile)
 }
 func (ns *NodeServer) stopNFS(stateFile, pidFile string)
 {
    err := killByPidFile(pidFile)
    if (err != nil)
    {
        klog.Errorf("failed to kill process with pid from %v: %v", pidFile, err)
    }
    os.Remove(pidFile)
    os.Remove(stateFile)
 }
 func (ns *NodeServer) listActiveNFS() (map[int][]string, error)
 {
    mounts, err := mount.ParseMountInfo("/proc/self/mountinfo")
    if (err != nil)
    {
        klog.Errorf("failed to list mounts: %v", err)
        return nil, err
    }
    activeNFS := make(map[int][]string)
    for _, mount := range mounts
    {
        // Volume mounts always refer to subpaths
        if (mount.FsType == "nfs" && mount.Root != "/")
        {
            for _, opt := range mount.MountOptions
            {
                if (strings.HasPrefix(opt, "port="))
                {
                    port64, err := strconv.ParseUint(opt[5:], 10, 16)
                    if (err == nil)
                    {
                        activeNFS[int(port64)] = append(activeNFS[int(port64)], mount.MountPoint)
                    }
                }
            }
        }
    }
    return activeNFS, 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"]
    if (ctxVars["vitastorfs"] != "")
    {
        ns.lockVolume(ctxVars["configPath"]+":fs:"+ctxVars["vitastorfs"])
        defer ns.unlockVolume(ctxVars["configPath"]+":fs:"+ctxVars["vitastorfs"])
    }
    else
    {
        ns.lockVolume(ctxVars["configPath"]+":block:"+volName)
        defer ns.unlockVolume(ctxVars["configPath"]+":block:"+volName)
    }
    stagingTargetPath := req.GetStagingTargetPath()
    targetPath := req.GetTargetPath()
    isBlock := req.GetVolumeCapability().GetBlock() != nil
    if (ctxVars["vitastorfs"] == "")
    {
        // Check that stagingTargetPath is mounted
        notmnt, err := mount.IsNotMountPoint(ns.mounter, stagingTargetPath)
        if (err != nil)
        {
            klog.Errorf("staging path %v is not mounted: %w", stagingTargetPath, err)
            return nil, fmt.Errorf("staging path %v is not mounted: %w", stagingTargetPath, err)
        }
        else if (notmnt)
        {
            klog.Errorf("staging path %v is not mounted", stagingTargetPath)
            return nil, fmt.Errorf("staging path %v is not mounted", stagingTargetPath)
        }
    }
    // Check that targetPath is not already mounted
    notmnt, 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
        }
    }
    else if (!notmnt)
    {
        klog.Errorf("target path %s is already mounted", targetPath)
        return nil, fmt.Errorf("target path %s is already mounted", targetPath)
    }
    if (ctxVars["vitastorfs"] != "")
    {
        nfspath, err := ns.mountNFS(ctxVars)
        if (err != nil)
        {
            ns.checkStopNFS(ctxVars)
            return nil, err
        }
        // volName should include prefix
        stagingTargetPath = nfspath+"/"+volName
        err = os.MkdirAll(stagingTargetPath, 0777)
        if (err != nil && !os.IsExist(err))
        {
            ns.checkStopNFS(ctxVars)
            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)
    {
        if (ctxVars["vitastorfs"] != "")
        {
            ns.checkStopNFS(ctxVars)
        }
        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"]
    if (ctxVars["vitastorfs"] != "")
    {
        ns.lockVolume(ctxVars["configPath"]+":fs:"+ctxVars["vitastorfs"])
        defer ns.unlockVolume(ctxVars["configPath"]+":fs:"+ctxVars["vitastorfs"])
    }
    else
    {
        ns.lockVolume(ctxVars["configPath"]+":block:"+volName)
        defer ns.unlockVolume(ctxVars["configPath"]+":block:"+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
    }
    if (ctxVars["vitastorfs"] != "")
    {
        ns.checkStopNFS(ctxVars)
    }
    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
@ -1,36 +0,0 @@
 // 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
@ -1,342 +0,0 @@
 // Copyright (c) Vitaliy Filippov, 2019+
 // License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
 package vitastor
 import (
    "bytes"
    "errors"
    "encoding/json"
    "fmt"
    "os"
    "os/exec"
    "path/filepath"
    "strconv"
    "strings"
    "syscall"
    "k8s.io/klog"
    "google.golang.org/grpc/codes"
    "google.golang.org/grpc/status"
 )
 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.",
        )
    }
    else
    {
        klog.Infof("VDUSE support enabled successfully")
    }
    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)
    }
    klog.Infof("Attached volume %s via NBD as %s", volName, dev)
    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)
                    {
                        klog.Infof("Attached volume %s via VDUSE as %s (VDPA ID %s)", volName, blockdev, vdpaId)
                        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)
    }
 }
 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\nOutput:\n%s", err, stdoutStr+stderrStr)
        return nil, nil, status.Error(codes.Internal, stdoutStr+stderrStr+" (status "+err.Error()+")")
    }
    return stdout.Bytes(), stderr.Bytes(), nil
 }
 func systemCombined(program string, args ...string) ([]byte, error)
 {
    klog.Infof("Running "+program+" "+strings.Join(args, " "))
    c := exec.Command(program, args...)
    var out bytes.Buffer
    c.Stdout, c.Stderr = &out, &out
    err := c.Run()
    if (err != nil)
    {
        outStr := string(out.Bytes())
        klog.Errorf(program+" "+strings.Join(args, " ")+" failed: %s, status %s\n", outStr, err)
        return nil, status.Error(codes.Internal, outStr+" (status "+err.Error()+")")
    }
    return out.Bytes(), nil
 }
--- a/csi/vitastor-csi.go
+++ b/csi/vitastor-csi.go
@ -1,39 +0,0 @@
 // 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
@ -1,58 +0,0 @@
 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
@ -1,7 +0,0 @@
 #!/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
@ -1,7 +0,0 @@
 #!/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
@ -1,7 +0,0 @@
 #!/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
@ -1,7 +0,0 @@
 #!/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
@ -1,41 +0,0 @@
 vitastor (1.10.0-1) 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
@ -1 +0,0 @@
 13
--- a/debian/control
+++ b/debian/control
@ -1,61 +0,0 @@
 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.
 Package: vitastor-opennebula
 Architecture: amd64
 Depends: ${shlibs:Depends}, ${misc:Depends}, vitastor-client, patch, python3, jq
 Description: Vitastor OpenNebula storage plugin
 Vitastor storage plugin for OpenNebula.
--- a/debian/copyright
+++ b/debian/copyright
@ -1,21 +0,0 @@
 Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
 Upstream-Name: vitastor
 Upstream-Contact: Vitaliy Filippov <vitalif@yourcmc.ru>
 Source: https://vitastor.io
 Files: *
 Copyright: 2019+ Vitaliy Filippov <vitalif@yourcmc.ru>
 License: Multiple licenses VNPL-1.1 and/or GPL-2.0+
 All server-side code (OSD, Monitor and so on) is licensed under the terms of
 Vitastor Network Public License 1.1 (VNPL 1.1), a copyleft license based on
 GNU GPLv3.0 with the additional "Network Interaction" clause which requires
 opensourcing all programs directly or indirectly interacting with Vitastor
 through a computer network and expressly designed to be used in conjunction
 with it ("Proxy Programs"). Proxy Programs may be made public not only under
 the terms of the same license, but also under the terms of any GPL-Compatible
 Free Software License, as listed by the Free Software Foundation.
 This is a stricter copyleft license than the Affero GPL.
 .
 Client libraries (cluster_client and so on) are dual-licensed under the same
 VNPL 1.1 and also GNU GPL 2.0 or later to allow for compatibility with GPLed
 software like QEMU and fio.
--- a/debian/fio_version
+++ b/debian/fio_version
@ -1 +0,0 @@
 dep:fio=3.16-1
--- a/debian/install
+++ b/debian/install
@ -1,4 +0,0 @@
 VNPL-1.1.txt usr/share/doc/vitastor
 GPL-2.0.txt usr/share/doc/vitastor
 README.md usr/share/doc/vitastor
 README-ru.md usr/share/doc/vitastor
--- a/debian/libisal.pc
+++ b/debian/libisal.pc
@ -1,11 +0,0 @@
 prefix=/usr
 exec_prefix=${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
@ -1,41 +0,0 @@
 # 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/$D
--- a/debian/patched-qemu.Dockerfile
+++ b/debian/patched-qemu.Dockerfile
@ -1,61 +0,0 @@
 # Build patched QEMU for Debian inside a container
 # cd ..; podman build --build-arg REL=bullseye -v `pwd`/packages:/root/packages -f debian/patched-qemu.Dockerfile .
 ARG REL=
 FROM debian:$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
@ -1 +0,0 @@
 patches/VitastorPlugin.pm usr/share/perl5/PVE/Storage/Custom/
--- a/debian/raw.h
+++ b/debian/raw.h
@ -1,19 +0,0 @@
 /* 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
@ -1,10 +0,0 @@
 #!/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
@ -1 +0,0 @@
 3.0 (quilt)
--- a/debian/vitastor-client-dev.install
+++ b/debian/vitastor-client-dev.install
@ -1,2 +0,0 @@
 usr/include
 usr/lib/*/pkgconfig
--- a/debian/vitastor-client.install
+++ b/debian/vitastor-client.install
@ -1,8 +0,0 @@
 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
@ -1 +0,0 @@
 usr/lib/*/libfio*.so*
--- a/debian/vitastor-mon.install
+++ b/debian/vitastor-mon.install
@ -1,3 +0,0 @@
 mon usr/lib/vitastor/
 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
@ -1,11 +0,0 @@
 #!/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
 	mkdir -p /var/lib/vitastor
 	chown vitastor:vitastor /var/lib/vitastor
 fi
--- a/debian/vitastor-opennebula.install
+++ b/debian/vitastor-opennebula.install
@ -1,3 +0,0 @@
 opennebula/remotes var/lib/one/
 opennebula/sudoers.d etc/
 opennebula/install.sh var/lib/one/remotes/datastore/vitastor/
--- a/debian/vitastor-opennebula.postinst
+++ b/debian/vitastor-opennebula.postinst
@ -1,7 +0,0 @@
 #!/bin/sh
 set -e
 if [ "$1" = "configure" ]; then
 	/var/lib/one/remotes/datastore/vitastor/install.sh
 fi
--- a/debian/vitastor-opennebula.triggers
+++ b/debian/vitastor-opennebula.triggers
@ -1,4 +0,0 @@
 interest /var/lib/one/remotes/datastore/downloader.sh
 interest /etc/one/oned.conf
 interest /etc/one/vmm_exec/vmm_execrc
 interest /etc/apparmor.d/local/abstractions/libvirt-qemu
--- a/debian/vitastor-osd.install
+++ b/debian/vitastor-osd.install
@ -1,6 +0,0 @@
 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
@ -1,10 +0,0 @@
 #!/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
@ -1,64 +0,0 @@
 # Build Vitastor packages for Debian inside a container
 # cd ..; podman build --build-arg DISTRO=debian --build-arg REL=bullseye -v `pwd`/packages:/root/packages -f debian/vitastor.Dockerfile .
 ARG DISTRO=debian
 ARG REL=
 FROM $DISTRO:$REL
 ARG DISTRO=debian
 ARG REL=
 WORKDIR /root
 RUN set -e -x; \
    if [ "$REL" = "buster" ]; then \
        apt-get update; \
        apt-get -y install wget; \
        wget https://vitastor.io/debian/pubkey.gpg -O /etc/apt/trusted.gpg.d/vitastor.gpg; \
        echo "deb https://vitastor.io/debian $REL main" >> /etc/apt/sources.list; \
    fi; \
    grep '^deb ' /etc/apt/sources.list | perl -pe 's/^deb/deb-src/' >> /etc/apt/sources.list; \
    perl -i -pe 's/Types: deb$/Types: deb deb-src/' /etc/apt/sources.list.d/debian.sources || true; \
    echo 'APT::Install-Recommends false;' >> /etc/apt/apt.conf; \
    echo 'APT::Install-Suggests false;' >> /etc/apt/apt.conf
 RUN apt-get update && \
    apt-get -y install fio liburing-dev libgoogle-perftools-dev devscripts libjerasure-dev cmake libibverbs-dev librdmacm-dev libisal-dev libnl-3-dev libnl-genl-3-dev curl && \
    apt-get -y build-dep fio && \
    apt-get --download-only source fio
 ADD . /root/vitastor
 RUN set -e -x; \
    [ -e /usr/lib/x86_64-linux-gnu/pkgconfig/libisal.pc ] || cp /root/vitastor/debian/libisal.pc /usr/lib/x86_64-linux-gnu/pkgconfig; \
    mkdir -p /root/fio-build/; \
    cd /root/fio-build/; \
    rm -rf /root/fio-build/*; \
    dpkg-source -x /root/fio*.dsc; \
    mkdir -p /root/packages/vitastor-$REL; \
    rm -rf /root/packages/vitastor-$REL/*; \
    cd /root/packages/vitastor-$REL; \
    FULLVER=$(head -n1 /root/vitastor/debian/changelog | perl -pe 's/^.*\((.*?)\).*$/$1/'); \
    VER=${FULLVER%%-*}; \
    cp -r /root/vitastor vitastor-$VER; \
    cd vitastor-$VER; \
    ln -s /root/fio-build/fio-*/ ./fio; \
    FIO=$(head -n1 fio/debian/changelog | perl -pe 's/^.*\((.*?)\).*$/$1/'); \
    ls /usr/include/linux/raw.h || cp ./debian/raw.h /usr/include/linux/raw.h; \
    sh copy-fio-includes.sh; \
    rm fio; \
    mkdir -p a b debian/patches; \
    mv fio-copy b/fio; \
    diff -NaurpbB a b > debian/patches/fio-headers.patch || true; \
    echo fio-headers.patch >> debian/patches/series; \
    rm -rf a b; \
    echo "dep:fio=$FIO" > debian/fio_version; \
    cd /root/packages/vitastor-$REL/vitastor-$VER; \
    mkdir mon/node_modules; \
    cd mon/node_modules; \
    curl -s https://git.yourcmc.ru/vitalif/antietcd/archive/master.tar.gz | tar -zx; \
    curl -s https://git.yourcmc.ru/vitalif/tinyraft/archive/master.tar.gz | tar -zx; \
    cd /root/packages/vitastor-$REL; \
    tar --sort=name --mtime='2020-01-01' --owner=0 --group=0 --exclude=debian -cJf vitastor_$VER.orig.tar.xz vitastor-$VER; \
    cd vitastor-$VER; \
    DEBFULLNAME="Vitaliy Filippov <vitalif@yourcmc.ru>" dch -D $REL -v "$FULLVER""$REL" "Rebuild for $REL"; \
    DEB_BUILD_OPTIONS=nocheck dpkg-buildpackage --jobs=auto -sa; \
    rm -rf /root/packages/vitastor-$REL/vitastor-*/
--- a/Show More
+++ b/Show More
		`@ -1 +0,0 @@`
			`Subproject commit 8de8b467acbca50cfd8835c20e0e379110f3b32b`
		`@ -1 +0,0 @@`
			`patches/VitastorPlugin.pm usr/share/perl5/PVE/Storage/Custom/`