Fix eviction when random_pos selects the end

- Do not try to allocate more DB blocks in an inode block until it's "confirmed" and "locked" by the first write
- Do not recheck for new zero DB blocks on first write into an inode block - a CAS failure means someone else is already writing into it
- Throw new allocation blocks away regardless of whether the known_version is 0 on a CAS failure

CLA-en.md

@@ -0,0 +1,115 @@
+## Contributor License Agreement
+
+> This Agreement is made in the Russian and English languages. **The English
+text of Agreement is for informational purposes only** and is not binding
+for the Parties.
+>
+> In the event of a conflict between the provisions of the Russian and
+English versions of this Agreement, the **Russian version shall prevail**.
+>
+> Russian version is published at https://git.yourcmc.ru/vitalif/vitastor/src/branch/master/CLA-ru.md
+
+This document represents the offer of Filippov Vitaliy Vladimirovich
+("Author"), author and copyright holder of Vitastor software ("Program"),
+acknowledged by a certificate of Federal Service for Intellectual
+Property of Russian Federation (Rospatent) # 2021617829 dated 20 May 2021,
+to "Contributors" to conclude this license agreement as follows
+("Agreement" or "Offer").
+
+In accordance with Art. 435, Art. 438 of the Civil Code of the Russian
+Federation, this Agreement is an offer and in case of acceptance of the
+offer, an agreement is considered concluded on the conditions specified
+in the offer.
+
+1. Applicable Terms. \
+   1.1. "Official Repository" shall mean the computer storage, operated by
+        the Author, containing all prior and future versions of the Source
+        Code of the Program, at Internet addresses https://git.yourcmc.ru/vitalif/vitastor/
+        or https://github.com/vitalif/vitastor/. \
+   1.2. "Contributions" shall mean results of intellectual activity
+        (including, but not limited to, source code, libraries, components,
+        texts, documentation) which can be software or elements of the software
+        and which are provided by Contributors to the Author for inclusion
+        in the Program. \
+   1.3. "Contributor" shall mean a person who provides Contributions to
+        the Author and agrees with all provisions of this Agreement.
+        A Сontributor can be: 1) an individual; or 2) a legal entity or an
+        individual entrepreneur in case when an individual provides Contributions
+        on behalf of third parties, including on behalf of his employer.
+
+2. Subject of the Agreement. \
+   2.1. Subject of the Agreement shall be the Contributions sent to the Author by Contributors.
+   2.2. The Contributor grants to the Author the right to use Contributions at his own
+        discretion and without any necessity to get a prior approval from Contributor or
+        any other third party in any way, under a simple (non-exclusive), royalty-free,
+        irrevocable license throughout the world by all means not contrary to law, in whole
+        or as a part of the Program, or other open-source or closed-source computer programs,
+        products or services (hereinafter -- the "License"), including, but not limited to: \
+        2.2.1. to execute Contributions and use them for any tasks; \
+        2.2.2. to publish and distribute Contributions in modified or unmodified form and/or to rent them; \
+        2.2.3. to modify Contributions, add comments, illustrations or any explanations to Contributions while using them; \
+        2.2.4. to create other results of intellectual activity based on Contributions, including derivative works and composite works; \
+        2.2.5. to translate Contributions into other languages, including other programming languages; \
+        2.2.6. to carry out rental and public display of Contributions; \
+        2.2.7. to use Contributions under the trade name and/or any trademark or any other label, or without it, as the Author thinks fit; \
+   2.3. The Contributor grants to the Author the right to sublicense any of the aforementioned
+        rights to third parties on any terms at the Author's discretion. \
+   2.4. The License is provided for the entire duration of Contributor's
+        exclusive intellectual property rights to the Contributions. \
+   2.5. The Contributor grants to the Author the right to decide how and where to mention,
+        or to not mention at all, the fact of his authorship, name, nickname and/or company
+        details when including Contributions into the Program or in any other computer
+        programs, products or services.
+
+3. Acceptance of the Offer \
+   3.1. The Contributor may provide Contributions to the Author in the form of
+        a "Pull Request" in an Official Repository of the Program or by any
+        other electronic means of communication, including, but not limited to,
+        E-mail or messenger applications. \
+   3.2. The acceptance of the Offer shall be the fact of provision of Contributions
+        to the Author by the Contributor by any means with the following remark:
+        “I accept Vitastor CLA agreement: https://git.yourcmc.ru/vitalif/vitastor/src/branch/master/CLA-en.md”
+        or “Я принимаю соглашение Vitastor CLA: https://git.yourcmc.ru/vitalif/vitastor/src/branch/master/CLA-ru.md”. \
+   3.3. Date of acceptance of the Offer shall be the date of such provision.
+
+4. Rights and obligations of the parties. \
+   4.1. The Contributor reserves the right to use Contributions by any lawful means
+        not contrary to this Agreement. \
+   4.2. The Author has the right to refuse to include Contributions into the Program
+        at any moment with no explanation to the Contributor.
+
+5. Representations and Warranties. \
+   5.1. The person providing Contributions for the purpose of their inclusion
+        in the Program represents and warrants that he is the Contributor
+        or legally acts on the Contributor's behalf. Name or company details
+        of the Contributor shall be provided with the Contribution at the moment
+        of their provision to the Author. \
+   5.2. The Contributor represents and warrants that he legally owns exclusive
+        intellectual property rights to the Contributions. \
+   5.3. The Contributor represents and warrants that any further use of \
+        Contributions by the Author as provided by Contributor under the terms
+        of the Agreement does not infringe on intellectual and other rights and
+        legitimate interests of third parties. \
+   5.4. The Contributor represents and warrants that he has all rights and legal
+        capacity needed to accept this Offer; \
+   5.5. The Contributor represents and warrants that Contributions don't
+        contain malware or any information considered illegal under the law
+        of Russian Federation.
+
+6. Termination of the Agreement \
+   6.1. The Agreement may be terminated at will of both Author and Contributor,
+        formalised in the written form or if the Agreement is terminated on
+        reasons prescribed by the law of Russian Federation.
+
+7. Final Clauses \
+   7.1. The Contributor may optionally sign the Agreement in the written form. \
+   7.2. The Agreement is deemed to become effective from the Date of signing of
+        the Agreement and until the expiration of Contributor's exclusive
+        intellectual property rights to the Contributions. \
+   7.3. The Author may unilaterally alter the Agreement without informing Contributors.
+        The new version of the document shall come into effect 3 (three) days after
+        being published in the Official Repository of the Program at Internet address
+        [https://git.yourcmc.ru/vitalif/vitastor/src/branch/master/CLA-en.md](https://git.yourcmc.ru/vitalif/vitastor/src/branch/master/CLA-en.md).
+        Contributors should keep informed about the actual version of the Agreement themselves. \
+   7.4. If the Author and the Contributor fail to agree on disputable issues,
+        disputes shall be referred to the Moscow Arbitration court.

CLA-ru.md

@@ -0,0 +1,108 @@
+## Лицензионное соглашение с участником
+
+> Данная Оферта написана в Русской и Английской версиях. **Версия на английском
+языке предоставляется в информационных целях** и не связывает стороны договора.
+>
+> В случае несоответствий между положениями Русской и Английской версий Договора,
+**Русская версия имеет приоритет**.
+>
+> Английская версия опубликована по адресу https://git.yourcmc.ru/vitalif/vitastor/src/branch/master/CLA-en.md
+
+Настоящий договор-оферта (далее по тексту – Оферта, Договор) адресована физическим
+и юридическим лицам (далее – Участникам) и является официальным публичным предложением
+Филиппова Виталия Владимировича (далее – Автора) программного обеспечения Vitastor,
+свидетельство Федеральной службы по интеллектуальной собственности (Роспатент) № 2021617829
+от 20 мая 2021 г. (далее – Программа) о нижеследующем:
+
+1. Термины и определения \
+   1.1. Репозиторий – электронное хранилище, содержащее исходный код Программы. \
+   1.2. Доработка – результат интеллектуальной деятельности Участника, включающий
+        в себя изменения или дополнения к исходному коду Программы, которые Участник
+        желает включить в состав Программы для дальнейшего использования и распространения
+        Автором и для этого направляет их Автору. \
+   1.3. Участник – физическое или юридическое лицо, вносящее Доработки в код Программы. \
+   1.4. ГК РФ – Гражданский кодекс Российской Федерации.
+
+2. Предмет оферты \
+   2.1. Предметом настоящей оферты являются Доработки, отправляемые Участником Автору. \
+   2.2. Участник предоставляет Автору право использовать Доработки по собственному усмотрению
+        и без необходимости предварительного согласования с Участником или иным третьим лицом
+        на условиях простой (неисключительной) безвозмездной безотзывной лицензии, полностью
+        или фрагментарно, в составе Программы или других программ, продуктов или сервисов
+        как с открытым, так и с закрытым исходным кодом, любыми способами, не противоречащими
+        закону, включая, но не ограничиваясь следующими: \
+        2.2.1. Запускать и использовать Доработки для выполнения любых задач; \
+        2.2.2. Распространять, импортировать и доводить Доработки до всеобщего сведения; \
+        2.2.3. Вносить в Доработки изменения, сокращения и дополнения, снабжать Доработки
+               при их использовании комментариями, иллюстрациями или пояснениями; \
+        2.2.4. Создавать на основе Доработок иные результаты интеллектуальной деятельности,
+               в том числе производные и составные произведения; \
+        2.2.5. Переводить Доработки на другие языки, в том числе на другие языки программирования; \
+        2.2.6. Осуществлять прокат и публичный показ Доработок; \
+        2.2.7. Использовать Доработки под любым фирменным наименованием, товарным знаком
+               (знаком обслуживания) или иным обозначением, или без такового. \
+   2.3. Участник предоставляет Автору право сублицензировать полученные права на Доработки
+        третьим лицам на любых условиях на усмотрение Автора. \
+   2.4. Участник предоставляет Автору права на Доработки на территории всего мира. \
+   2.5. Участник предоставляет Автору права на весь срок действия исключительного права
+        Участника на Доработки. \
+   2.6. Участник предоставляет Автору права на Доработки на безвозмездной основе. \
+   2.7. Участник разрешает Автору самостоятельно определять порядок, способ и
+        место указания его имени, реквизитов и/или псевдонима при включении
+        Доработок в состав Программы или других программ, продуктов или сервисов.
+
+3. Акцепт Оферты \
+   3.1. Участник может передавать Доработки в адрес Автора через зеркала официального
+        Репозитория Программы по адресам https://git.yourcmc.ru/vitalif/vitastor/ или
+        https://github.com/vitalif/vitastor/ в виде “запроса на слияние” (pull request),
+        либо в письменном виде или с помощью любых других электронных средств коммуникации,
+        например, электронной почты или мессенджеров. \
+   3.2. Факт передачи Участником Доработок в адрес Автора любым способом с одной из пометок
+        “I accept Vitastor CLA agreement: https://git.yourcmc.ru/vitalif/vitastor/src/branch/master/CLA-en.md”
+        или “Я принимаю соглашение Vitastor CLA: https://git.yourcmc.ru/vitalif/vitastor/src/branch/master/CLA-ru.md”
+        является полным и безоговорочным акцептом (принятием) Участником условий настоящей
+        Оферты, т.е. Участник считается ознакомившимся с настоящим публичным договором и
+        в соответствии с ГК РФ признается лицом, вступившим с Автором в договорные отношения
+        на основании настоящей Оферты. \
+   3.3. Датой акцептирования настоящей Оферты считается дата такой передачи.
+
+4. Права и обязанности Сторон \
+   4.1. Участник сохраняет за собой право использовать Доработки любым законным
+        способом, не противоречащим настоящему Договору. \
+   4.2. Автор вправе отказать Участнику во включении Доработок в состав
+        Программы без объяснения причин в любой момент по своему усмотрению.
+
+5. Гарантии и заверения \
+   5.1. Лицо, направляющее Доработки для целей их включения в состав Программы,
+        гарантирует, что является Участником или представителем Участника. Имя или реквизиты
+        Участника должны быть указаны при их передаче в адрес Автора Программы. \
+   5.2. Участник гарантирует, что является законным обладателем исключительных прав
+        на Доработки. \
+   5.3. Участник гарантирует, что на момент акцептирования настоящей Оферты ему
+        ничего не известно (и не могло быть известно) о правах третьих лиц на
+        передаваемые Автору Доработки или их часть, которые могут быть нарушены
+        в связи с передачей Доработок по настоящему Договору. \
+   5.4. Участник гарантирует, что является дееспособным лицом и обладает всеми
+        необходимыми правами для заключения Договора. \
+   5.5. Участник гарантирует, что Доработки не содержат вредоносного ПО, а также
+        любой другой информации, запрещённой к распространению по законам Российской
+        Федерации.
+
+6. Прекращение действия оферты \
+   6.1. Действие настоящего договора может быть прекращено по соглашению сторон,
+        оформленному в письменном виде, а также вследствие его расторжения по основаниям,
+        предусмотренным законом.
+
+7. Заключительные положения \
+   7.1. Участник вправе по желанию подписать настоящий Договор в письменном виде. \
+   7.2. Настоящий договор действует с момента его заключения и до истечения срока
+        действия исключительных прав Участника на Доработки. \
+   7.3. Автор имеет право в одностороннем порядке вносить изменения и дополнения в договор
+        без специального уведомления об этом Участников. Новая редакция документа вступает
+        в силу через 3 (Три) календарных дня со дня опубликования в официальном Репозитории
+        Программы по адресу в сети Интернет
+        [https://git.yourcmc.ru/vitalif/vitastor/src/branch/master/CLA-ru.md](https://git.yourcmc.ru/vitalif/vitastor/src/branch/master/CLA-ru.md).
+        Участники самостоятельно отслеживают действующие условия Оферты. \
+   7.4. Все споры, возникающие между сторонами в процессе их взаимодействия по настоящему
+        договору, решаются путём переговоров. В случае невозможности урегулирования споров
+        переговорным порядком стороны разрешают их в Арбитражном суде г.Москвы.

CMakeLists.txt

@@ -2,6 +2,6 @@ cmake_minimum_required(VERSION 2.8.12)
 
 project(vitastor)
 
-set(VERSION "1.2.0")
+set(VERSION "1.3.1")
 
 add_subdirectory(src)

csi/Dockerfile

@@ -1,14 +1,15 @@
 # Compile stage
-FROM golang:buster AS build
+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/$1} else/g; print; }' `find /app -name '*.go'`
+RUN perl -i -e '$/ = undef; while(<>) { s/\n\s*(\{\s*\n)/$1\n/g; s/\}(\s*\n\s*)else\b/$1} else/g; print; }' `find /app -name '*.go'` && \
-RUN cd /app; CGO_ENABLED=1 GOOS=linux GOARCH=amd64 go build -o vitastor-csi
+    cd /app && \
+    CGO_ENABLED=1 GOOS=linux GOARCH=amd64 go build -o vitastor-csi
 
 # Final stage
-FROM debian:buster
+FROM debian:bookworm
 
 LABEL maintainers="Vitaliy Filippov <vitalif@yourcmc.ru>"
 LABEL description="Vitastor CSI Driver"
@@ -18,19 +19,30 @@ ENV CSI_ENDPOINT=""
 
 RUN apt-get update && \
     apt-get install -y wget && \
-    (echo deb http://deb.debian.org/debian buster-backports main > /etc/apt/sources.list.d/backports.list) && \
     (echo "APT::Install-Recommends false;" > /etc/apt/apt.conf) && \
     apt-get update && \
-    apt-get install -y e2fsprogs xfsprogs kmod && \
+    apt-get install -y e2fsprogs xfsprogs kmod iproute2 \
+        # dependencies of qemu-storage-daemon
+        libnuma1 liburing2 libglib2.0-0 libfuse3-3 libaio1 libzstd1 libnettle8 \
+        libgmp10 libhogweed6 libp11-kit0 libidn2-0 libunistring2 libtasn1-6 libpcre2-8-0 libffi8 && \
     apt-get clean && \
     (echo options nbd nbds_max=128 > /etc/modprobe.d/nbd.conf)
 
 COPY --from=build /app/vitastor-csi /bin/
 
-RUN (echo deb http://vitastor.io/debian buster main > /etc/apt/sources.list.d/vitastor.list) && \
+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"]

csi/Makefile

@@ -1,4 +1,4 @@
-VERSION ?= v1.2.0
+VERSION ?= v1.3.1
 
 all: build push
 

csi/deploy/001-csi-config-map.yaml

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

csi/deploy/004-csi-nodeplugin.yaml

@@ -49,7 +49,7 @@ spec:
             capabilities:
               add: ["SYS_ADMIN"]
             allowPrivilegeEscalation: true
-          image: vitalif/vitastor-csi:v1.2.0
+          image: vitalif/vitastor-csi:v1.3.1
           args:
             - "--node=$(NODE_ID)"
             - "--endpoint=$(CSI_ENDPOINT)"
@@ -82,6 +82,8 @@ spec:
               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
@@ -132,6 +134,9 @@ spec:
         - name: host-mount
           hostPath:
             path: /run/mount
+        - name: run-vitastor-csi
+          hostPath:
+            path: /run/vitastor-csi
         - name: lib-modules
           hostPath:
             path: /lib/modules

csi/deploy/007-csi-provisioner.yaml

@@ -121,7 +121,7 @@ spec:
             privileged: true
             capabilities:
               add: ["SYS_ADMIN"]
-          image: vitalif/vitastor-csi:v1.2.0
+          image: vitalif/vitastor-csi:v1.3.1
           args:
             - "--node=$(NODE_ID)"
             - "--endpoint=$(CSI_ENDPOINT)"

csi/deploy/009-storage-class.yaml

@@ -12,9 +12,6 @@ parameters:
   etcdVolumePrefix: ""
   poolId: "1"
   # you can choose other configuration file if you have it in the config map
+  # different etcd URLs and prefixes should also be put in the config
   #configPath: "/etc/vitastor/vitastor.conf"
-  # you can also specify etcdUrl here, maybe to connect to another Vitastor cluster
-  # multiple etcdUrls may be specified, delimited by comma
-  #etcdUrl: "http://192.168.7.2:2379"
-  #etcdPrefix: "/vitastor"
 allowVolumeExpansion: true

csi/src/config.go

@@ -5,7 +5,7 @@ package vitastor
 
 const (
     vitastorCSIDriverName    = "csi.vitastor.io"
-    vitastorCSIDriverVersion = "1.2.0"
+    vitastorCSIDriverVersion = "1.3.1"
 )
 
 // Config struct fills the parameters of request or user input

csi/src/controllerserver.go

@@ -62,7 +62,7 @@ func NewControllerServer(driver *Driver) *ControllerServer
     }
 }
 
-func GetConnectionParams(params map[string]string) (map[string]string, []string, string)
+func GetConnectionParams(params map[string]string) (map[string]string, error)
 {
     ctxVars := make(map[string]string)
     configPath := params["configPath"]
@@ -75,71 +75,69 @@ func GetConnectionParams(params map[string]string) (map[string]string, []string,
         ctxVars["configPath"] = configPath
     }
     config := make(map[string]interface{})
-    if configFD, err := os.Open(configPath); err == nil
+    configFD, err := os.Open(configPath)
+    if (err != nil)
     {
-        defer configFD.Close()
+        return nil, err
-        data, _ := ioutil.ReadAll(configFD)
-        json.Unmarshal(data, &config)
     }
-    // Try to load prefix & etcd URL from the config
+    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
-    if (params["etcdUrl"] != "")
+    switch config["etcd_address"].(type)
     {
-        ctxVars["etcdUrl"] = params["etcdUrl"]
+    case string:
-        etcdUrl = strings.Split(params["etcdUrl"], ",")
+        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)
     {
-        switch config["etcd_address"].(type)
+        return nil, status.Error(codes.InvalidArgument, "etcd_address is missing in "+configPath)
-        {
-        case string:
-            etcdUrl = strings.Split(config["etcd_address"].(string), ",")
-        case []string:
-            etcdUrl = config["etcd_address"].([]string)
-        }
     }
-    etcdPrefix := params["etcdPrefix"]
+    return ctxVars, nil
-    if (etcdPrefix == "")
+}
+
+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)
     {
-        etcdPrefix, _ = config["etcd_prefix"].(string)
+        stdoutStr, stderrStr := string(stdout.Bytes()), string(stderr.Bytes())
-        if (etcdPrefix == "")
+        klog.Errorf(program+" "+strings.Join(args, " ")+" failed: %s, status %s\n", stdoutStr+stderrStr, err)
-        {
+        return nil, nil, status.Error(codes.Internal, stdoutStr+stderrStr+" (status "+err.Error()+")")
-            etcdPrefix = "/vitastor"
-        }
     }
-    else
+    return stdout.Bytes(), stderr.Bytes(), nil
-    {
-        ctxVars["etcdPrefix"] = etcdPrefix
-    }
-    return ctxVars, etcdUrl, etcdPrefix
 }
 
 func invokeCLI(ctxVars map[string]string, args []string) ([]byte, error)
 {
-    if (ctxVars["etcdUrl"] != "")
-    {
-        args = append(args, "--etcd_address", ctxVars["etcdUrl"])
-    }
-    if (ctxVars["etcdPrefix"] != "")
-    {
-        args = append(args, "--etcd_prefix", ctxVars["etcdPrefix"])
-    }
     if (ctxVars["configPath"] != "")
     {
         args = append(args, "--config_path", ctxVars["configPath"])
     }
-    c := exec.Command("/usr/bin/vitastor-cli", args...)
+    stdout, _, err := system("/usr/bin/vitastor-cli", args...)
-    var stdout, stderr bytes.Buffer
+    return stdout, err
-    c.Stdout = &stdout
-    c.Stderr = &stderr
-    err := c.Run()
-    stderrStr := string(stderr.Bytes())
-    if (err != nil)
-    {
-        klog.Errorf("vitastor-cli %s failed: %s, status %s\n", strings.Join(args, " "), stderrStr, err)
-        return nil, status.Error(codes.Internal, stderrStr+" (status "+err.Error()+")")
-    }
-    return stdout.Bytes(), nil
 }
 
 // Create the volume
@@ -174,10 +172,10 @@ func (cs *ControllerServer) CreateVolume(ctx context.Context, req *csi.CreateVol
         volSize = ((capRange.GetRequiredBytes() + MB - 1) / MB) * MB
     }
 
-    ctxVars, etcdUrl, _ := GetConnectionParams(req.Parameters)
+    ctxVars, err := GetConnectionParams(req.Parameters)
-    if (len(etcdUrl) == 0)
+    if (err != nil)
     {
-        return nil, status.Error(codes.InvalidArgument, "no etcdUrl in storage class configuration and no etcd_address in vitastor.conf")
+        return nil, err
     }
 
     args := []string{ "create", volName, "-s", fmt.Sprintf("%v", volSize), "--pool", fmt.Sprintf("%v", poolId) }
@@ -207,7 +205,7 @@ func (cs *ControllerServer) CreateVolume(ctx context.Context, req *csi.CreateVol
     }
 
     // Create image using vitastor-cli
-    _, err := invokeCLI(ctxVars, args)
+    _, err = invokeCLI(ctxVars, args)
     if (err != nil)
     {
         if (strings.Index(err.Error(), "already exists") > 0)
@@ -257,7 +255,11 @@ func (cs *ControllerServer) DeleteVolume(ctx context.Context, req *csi.DeleteVol
     }
     volName := volVars["name"]
 
-    ctxVars, _, _ := GetConnectionParams(volVars)
+    ctxVars, err := GetConnectionParams(volVars)
+    if (err != nil)
+    {
+        return nil, err
+    }
 
     _, err = invokeCLI(ctxVars, []string{ "rm", volName })
     if (err != nil)
@@ -469,7 +471,11 @@ func (cs *ControllerServer) DeleteSnapshot(ctx context.Context, req *csi.DeleteS
     volName := volVars["name"]
     snapName := volVars["snapshot"]
 
-    ctxVars, _, _ := GetConnectionParams(volVars)
+    ctxVars, err := GetConnectionParams(volVars)
+    if (err != nil)
+    {
+        return nil, err
+    }
 
     _, err = invokeCLI(ctxVars, []string{ "rm", volName+"@"+snapName })
     if (err != nil)
@@ -496,7 +502,11 @@ func (cs *ControllerServer) ListSnapshots(ctx context.Context, req *csi.ListSnap
         return nil, status.Error(codes.Internal, "volume ID not in JSON format")
     }
     volName := volVars["name"]
-    ctxVars, _, _ := GetConnectionParams(volVars)
+    ctxVars, err := GetConnectionParams(volVars)
+    if (err != nil)
+    {
+        return nil, err
+    }
 
     inodeCfg, err := invokeList(ctxVars, volName+"@*", false)
     if (err != nil)
@@ -555,7 +565,11 @@ func (cs *ControllerServer) ControllerExpandVolume(ctx context.Context, req *csi
         return nil, status.Error(codes.Internal, "volume ID not in JSON format")
     }
     volName := volVars["name"]
-    ctxVars, _, _ := GetConnectionParams(volVars)
+    ctxVars, err := GetConnectionParams(volVars)
+    if (err != nil)
+    {
+        return nil, err
+    }
 
     inodeCfg, err := invokeList(ctxVars, volName, true)
     if (err != nil)

csi/src/nodeserver.go

@@ -5,11 +5,16 @@ package vitastor
 
 import (
     "context"
+    "errors"
+    "encoding/json"
+    "fmt"
     "os"
     "os/exec"
-    "encoding/json"
+    "path/filepath"
+    "strconv"
     "strings"
-    "bytes"
+    "syscall"
+    "time"
 
     "google.golang.org/grpc/codes"
     "google.golang.org/grpc/status"
@@ -25,16 +30,102 @@ import (
 type NodeServer struct
 {
     *Driver
+    useVduse bool
+    stateDir string
     mounter mount.Interface
+    restartInterval time.Duration
+}
+
+type DeviceState struct
+{
+    ConfigPath string `json:"configPath"`
+    VdpaId     string `json:"vdpaId"`
+    Image      string `json:"image"`
+    Blockdev   string `json:"blockdev"`
+    Readonly   bool   `json:"readonly"`
+    PidFile    string `json:"pidFile"`
 }
 
 // NewNodeServer create new instance node
 func NewNodeServer(driver *Driver) *NodeServer
 {
-    return &NodeServer{
+    stateDir := os.Getenv("STATE_DIR")
+    if (stateDir == "")
+    {
+        stateDir = "/run/vitastor-csi"
+    }
+    if (stateDir[len(stateDir)-1] != '/')
+    {
+        stateDir += "/"
+    }
+    ns := &NodeServer{
         Driver: driver,
+        useVduse: checkVduseSupport(),
+        stateDir: stateDir,
         mounter: mount.New(""),
     }
+    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 checkVduseSupport() bool
+{
+    // Check VDUSE support (vdpa, vduse, virtio-vdpa kernel modules)
+    vduse := true
+    for _, mod := range []string{"vdpa", "vduse", "virtio-vdpa"}
+    {
+        _, err := os.Stat("/sys/module/"+mod)
+        if (err != nil)
+        {
+            if (!errors.Is(err, os.ErrNotExist))
+            {
+                klog.Errorf("failed to check /sys/module/%s: %v", mod, err)
+            }
+            c := exec.Command("/sbin/modprobe", mod)
+            c.Stdout = os.Stderr
+            c.Stderr = os.Stderr
+            err := c.Run()
+            if (err != nil)
+            {
+                klog.Errorf("/sbin/modprobe %s failed: %v", mod, err)
+                vduse = false
+                break
+            }
+        }
+    }
+    // Check that vdpa tool functions
+    if (vduse)
+    {
+        c := exec.Command("/sbin/vdpa", "-j", "dev")
+        c.Stderr = os.Stderr
+        err := c.Run()
+        if (err != nil)
+        {
+            klog.Errorf("/sbin/vdpa -j dev failed: %v", err)
+            vduse = false
+        }
+    }
+    if (!vduse)
+    {
+        klog.Errorf(
+            "Your host apparently has no VDUSE support. VDUSE support disabled, NBD will be used to map devices."+
+            " For VDUSE you need at least Linux 5.15 and the following kernel modules: vdpa, virtio-vdpa, vduse.",
+        )
+    }
+    return vduse
 }
 
 // NodeStageVolume mounts the volume to a staging path on the node.
@@ -61,6 +152,318 @@ func Contains(list []string, s string) bool
     return false
 }
 
+func (ns *NodeServer) mapNbd(volName string, ctxVars map[string]string, readonly bool) (string, error)
+{
+    // Map NBD device
+    // FIXME: Check if already mapped
+    args := []string{
+        "map", "--image", volName,
+    }
+    if (ctxVars["configPath"] != "")
+    {
+        args = append(args, "--config_path", ctxVars["configPath"])
+    }
+    if (readonly)
+    {
+        args = append(args, "--readonly", "1")
+    }
+    stdout, stderr, err := system("/usr/bin/vitastor-nbd", args...)
+    dev := strings.TrimSpace(string(stdout))
+    if (dev == "")
+    {
+        return "", fmt.Errorf("vitastor-nbd did not return the name of NBD device. output: %s", stderr)
+    }
+    return dev, err
+}
+
+func (ns *NodeServer) 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)
+{
+    klog.Infof("killing process with PID from file %s", pidFile)
+    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
+{
+    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 (ns *NodeServer) mapVduse(volName string, ctxVars map[string]string, readonly bool) (string, string, error)
+{
+    // Generate state file
+    stateFd, err := os.CreateTemp(ns.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 := ns.stateDir + vdpaId + ".pid"
+    // Map VDUSE device via qemu-storage-daemon
+    err = startStorageDaemon(vdpaId, volName, pidFile, ctxVars["configPath"], readonly)
+    if (err == nil)
+    {
+        // Add device to VDPA bus
+        _, _, err = system("/sbin/vdpa", "-j", "dev", "add", "name", vdpaId, "mgmtdev", "vduse")
+        if (err == nil)
+        {
+            // Find block device name
+            var matches []string
+            matches, err = filepath.Glob("/sys/bus/vdpa/devices/"+vdpaId+"/virtio*/block/*")
+            if (err == nil && len(matches) == 0)
+            {
+                err = errors.New("/sys/bus/vdpa/devices/"+vdpaId+"/virtio*/block/* is not found")
+            }
+            if (err == nil)
+            {
+                blockdev := "/dev/"+filepath.Base(matches[0])
+                _, err = os.Stat(blockdev)
+                if (err == nil)
+                {
+                    // Generate state file
+                    stateJSON, _ := json.Marshal(&DeviceState{
+                        ConfigPath: ctxVars["configPath"],
+                        VdpaId:     vdpaId,
+                        Image:      volName,
+                        Blockdev:   blockdev,
+                        Readonly:   readonly,
+                        PidFile:    pidFile,
+                    })
+                    err = os.WriteFile(stateFile, stateJSON, 0600)
+                    if (err == nil)
+                    {
+                        return blockdev, vdpaId, nil
+                    }
+                }
+            }
+        }
+        killErr := killByPidFile(pidFile)
+        if (killErr != nil)
+        {
+            klog.Errorf("Failed to kill started qemu-storage-daemon: %v", killErr)
+        }
+        os.Remove(stateFile)
+        os.Remove(pidFile)
+    }
+    return "", "", err
+}
+
+func (ns *NodeServer) unmapVduse(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
+    }
+    ns.unmapVduseById(vdpaId)
+}
+
+func (ns *NodeServer) unmapVduseById(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 := ns.stateDir + vdpaId + ".json"
+    os.Remove(stateFile)
+    pidFile := ns.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 (ns *NodeServer) restarter()
+{
+    // Restart dead VDUSE daemons at regular intervals
+    // Otherwise volume I/O may hang in case of a qemu-storage-daemon crash
+    // Moreover, it may lead to a kernel panic of the kernel is configured to
+    // panic on hung tasks
+    ticker := time.NewTicker(ns.restartInterval)
+    defer ticker.Stop()
+    for
+    {
+        <-ticker.C
+        ns.restoreVduseDaemons()
+    }
+}
+
+func (ns *NodeServer) restoreVduseDaemons()
+{
+    pattern := ns.stateDir+"vitastor-vduse-*.json"
+    matches, err := filepath.Glob(pattern)
+    if (err != nil)
+    {
+        klog.Errorf("failed to list %s: %v", pattern, err)
+    }
+    if (len(matches) == 0)
+    {
+        return
+    }
+    devList := make(map[string]interface{})
+    // example output: {"dev":{"test1":{"type":"block","mgmtdev":"vduse","vendor_id":0,"max_vqs":16,"max_vq_size":128}}}
+    devListJSON, _, err := system("/sbin/vdpa", "-j", "dev", "list")
+    if (err != nil)
+    {
+        return
+    }
+    err = json.Unmarshal(devListJSON, &devList)
+    devs, ok := devList["dev"].(map[string]interface{})
+    if (err != nil || !ok)
+    {
+        klog.Errorf("/sbin/vdpa -j dev list returned bad JSON (error %v): %v", err, string(devListJSON))
+        return
+    }
+    for _, stateFile := range matches
+    {
+        vdpaId := filepath.Base(stateFile)
+        vdpaId = vdpaId[0:len(vdpaId)-5]
+        // Check if VDPA device is still added to the bus
+        if (devs[vdpaId] != nil)
+        {
+            // 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
+                stateJSON, err := os.ReadFile(stateFile)
+                if (err != nil)
+                {
+                    klog.Warningf("error reading state file %v: %v", stateFile, err)
+                }
+                else
+                {
+                    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))
+                    }
+                    else
+                    {
+                        klog.Warningf("restarting storage daemon for volume %v (VDPA ID %v)", state.Image, vdpaId)
+                        _ = startStorageDaemon(vdpaId, state.Image, pidFile, state.ConfigPath, state.Readonly)
+                    }
+                }
+            }
+        }
+        else
+        {
+            // Unused, clean it up
+            ns.unmapVduseById(vdpaId)
+        }
+    }
+}
+
 // 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)
 {
@@ -81,13 +484,13 @@ func (ns *NodeServer) NodePublishVolume(ctx context.Context, req *csi.NodePublis
                 if (err != nil)
                 {
                     klog.Errorf("failed to create block device mount target %s with error: %v", targetPath, err)
-                    return nil, status.Error(codes.Internal, err.Error())
+                    return nil, err
                 }
                 err = pathFile.Close()
                 if (err != nil)
                 {
                     klog.Errorf("failed to close %s with error: %v", targetPath, err)
-                    return nil, status.Error(codes.Internal, err.Error())
+                    return nil, err
                 }
             }
             else
@@ -96,13 +499,13 @@ func (ns *NodeServer) NodePublishVolume(ctx context.Context, req *csi.NodePublis
                 if (err != nil)
                 {
                     klog.Errorf("failed to create fs mount target %s with error: %v", targetPath, err)
-                    return nil, status.Error(codes.Internal, err.Error())
+                    return nil, err
                 }
             }
         }
         else
         {
-            return nil, status.Error(codes.Internal, err.Error())
+            return nil, err
         }
     }
 
@@ -114,38 +517,25 @@ func (ns *NodeServer) NodePublishVolume(ctx context.Context, req *csi.NodePublis
     }
     volName := ctxVars["name"]
 
-    _, etcdUrl, etcdPrefix := GetConnectionParams(ctxVars)
+    _, err = GetConnectionParams(ctxVars)
-    if (len(etcdUrl) == 0)
-    {
-        return nil, status.Error(codes.InvalidArgument, "no etcdUrl in storage class configuration and no etcd_address in vitastor.conf")
-    }
-
-    // Map NBD device
-    // FIXME: Check if already mapped
-    args := []string{
-        "map", "--etcd_address", strings.Join(etcdUrl, ","),
-        "--etcd_prefix", etcdPrefix,
-        "--image", volName,
-    };
-    if (ctxVars["configPath"] != "")
-    {
-        args = append(args, "--config_path", ctxVars["configPath"])
-    }
-    if (req.GetReadonly())
-    {
-        args = append(args, "--readonly", "1")
-    }
-    c := exec.Command("/usr/bin/vitastor-nbd", args...)
-    var stdout, stderr bytes.Buffer
-    c.Stdout, c.Stderr = &stdout, &stderr
-    err = c.Run()
-    stdoutStr, stderrStr := string(stdout.Bytes()), string(stderr.Bytes())
     if (err != nil)
     {
-        klog.Errorf("vitastor-nbd map failed: %s, status %s\n", stdoutStr+stderrStr, err)
+        return nil, err
-        return nil, status.Error(codes.Internal, stdoutStr+stderrStr+" (status "+err.Error()+")")
+    }
+
+    var devicePath, vdpaId string
+    if (!ns.useVduse)
+    {
+        devicePath, err = ns.mapNbd(volName, ctxVars, req.GetReadonly())
+    }
+    else
+    {
+        devicePath, vdpaId, err = ns.mapVduse(volName, ctxVars, req.GetReadonly())
+    }
+    if (err != nil)
+    {
+        return nil, err
     }
-    devicePath := strings.TrimSpace(stdoutStr)
 
     diskMounter := &mount.SafeFormatAndMount{Interface: ns.mounter, Exec: utilexec.New()}
     if (isBlock)
@@ -227,13 +617,15 @@ func (ns *NodeServer) NodePublishVolume(ctx context.Context, req *csi.NodePublis
     return &csi.NodePublishVolumeResponse{}, nil
 
 unmap:
-    // unmap NBD device
+    if (!ns.useVduse || len(devicePath) >= 8 && devicePath[0:8] == "/dev/nbd")
-    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)
+        ns.unmapNbd(devicePath)
     }
-    return nil, status.Error(codes.Internal, err.Error())
+    else
+    {
+        ns.unmapVduseById(vdpaId)
+    }
+    return nil, err
 }
 
 // NodeUnpublishVolume unmounts the volume from the target path
@@ -248,25 +640,31 @@ func (ns *NodeServer) NodeUnpublishVolume(ctx context.Context, req *csi.NodeUnpu
         {
             return nil, status.Error(codes.NotFound, "Target path not found")
         }
-        return nil, status.Error(codes.Internal, err.Error())
+        return nil, err
     }
     if (devicePath == "")
     {
-        return nil, status.Error(codes.NotFound, "Volume not mounted")
+        // 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, status.Error(codes.Internal, err.Error())
+        return nil, err
     }
     // unmap NBD device
     if (refCount == 1)
     {
-        unmapOut, unmapErr := exec.Command("/usr/bin/vitastor-nbd", "unmap", devicePath).CombinedOutput()
+        if (!ns.useVduse)
-        if (unmapErr != nil)
         {
-            klog.Errorf("failed to unmap NBD device %s: %s, error: %v", devicePath, unmapOut, unmapErr)
+            ns.unmapNbd(devicePath)
+        }
+        else
+        {
+            ns.unmapVduse(devicePath)
         }
     }
     return &csi.NodeUnpublishVolumeResponse{}, nil

debian/changelog

@@ -1,10 +1,10 @@
-vitastor (1.2.0-1) unstable; urgency=medium
+vitastor (1.3.1-1) unstable; urgency=medium
 
   * Bugfixes
 
  -- Vitaliy Filippov <vitalif@yourcmc.ru>  Fri, 03 Jun 2022 02:09:44 +0300
 
-vitastor (1.2.0-1) unstable; urgency=medium
+vitastor (0.7.0-1) unstable; urgency=medium
 
   * Implement NFS proxy
   * Add documentation

debian/patched-qemu.Dockerfile

@@ -7,7 +7,7 @@ ARG REL=
 
 WORKDIR /root
 
-RUN if [ "$REL" = "buster" -o "$REL" = "bullseye" ]; then \
+RUN if [ "$REL" = "buster" -o "$REL" = "bullseye" -o "$REL" = "bookworm" ]; then \
         echo "deb http://deb.debian.org/debian $REL-backports main" >> /etc/apt/sources.list; \
         echo >> /etc/apt/preferences; \
         echo 'Package: *' >> /etc/apt/preferences; \
@@ -45,7 +45,7 @@ RUN set -e; \
     rm -rf /root/packages/qemu-$REL/*; \
     cd /root/packages/qemu-$REL; \
     dpkg-source -x /root/qemu*.dsc; \
-    QEMU_VER=$(ls -d qemu*/ | perl -pe 's!^.*(\d+\.\d+).*!$1!'); \
+    QEMU_VER=$(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; \

debian/vitastor.Dockerfile

@@ -35,8 +35,8 @@ RUN set -e -x; \
     mkdir -p /root/packages/vitastor-$REL; \
     rm -rf /root/packages/vitastor-$REL/*; \
     cd /root/packages/vitastor-$REL; \
-    cp -r /root/vitastor vitastor-1.2.0; \
+    cp -r /root/vitastor vitastor-1.3.1; \
-    cd vitastor-1.2.0; \
+    cd vitastor-1.3.1; \
     ln -s /root/fio-build/fio-*/ ./fio; \
     FIO=$(head -n1 fio/debian/changelog | perl -pe 's/^.*\((.*?)\).*$/$1/'); \
     ls /usr/include/linux/raw.h || cp ./debian/raw.h /usr/include/linux/raw.h; \
@@ -49,8 +49,8 @@ RUN set -e -x; \
     rm -rf a b; \
     echo "dep:fio=$FIO" > debian/fio_version; \
     cd /root/packages/vitastor-$REL; \
-    tar --sort=name --mtime='2020-01-01' --owner=0 --group=0 --exclude=debian -cJf vitastor_1.2.0.orig.tar.xz vitastor-1.2.0; \
+    tar --sort=name --mtime='2020-01-01' --owner=0 --group=0 --exclude=debian -cJf vitastor_1.3.1.orig.tar.xz vitastor-1.3.1; \
-    cd vitastor-1.2.0; \
+    cd vitastor-1.3.1; \
     V=$(head -n1 debian/changelog | perl -pe 's/^.*\((.*?)\).*$/$1/'); \
     DEBFULLNAME="Vitaliy Filippov <vitalif@yourcmc.ru>" dch -D $REL -v "$V""$REL" "Rebuild for $REL"; \
     DEB_BUILD_OPTIONS=nocheck dpkg-buildpackage --jobs=auto -sa; \

docs/config/client.en.md

@@ -6,8 +6,8 @@
 
 # Client Parameters
 
-These parameters apply only to clients and affect their interaction with
+These parameters apply only to Vitastor clients (QEMU, fio, NBD and so on) and
-the cluster.
+affect their interaction with the cluster.
 
 - [client_max_dirty_bytes](#client_max_dirty_bytes)
 - [client_max_dirty_ops](#client_max_dirty_ops)
@@ -15,6 +15,9 @@ the cluster.
 - [client_max_buffered_bytes](#client_max_buffered_bytes)
 - [client_max_buffered_ops](#client_max_buffered_ops)
 - [client_max_writeback_iodepth](#client_max_writeback_iodepth)
+- [nbd_timeout](#nbd_timeout)
+- [nbd_max_devices](#nbd_max_devices)
+- [nbd_max_part](#nbd_max_part)
 
 ## client_max_dirty_bytes
 
@@ -101,3 +104,34 @@ Multiple consecutive modified data regions are counted as 1 write here.
 - Can be changed online: yes
 
 Maximum number of parallel writes when flushing buffered data to the server.
+
+## nbd_timeout
+
+- Type: seconds
+- Default: 300
+
+Timeout for I/O operations for [NBD](../usage/nbd.en.md). If an operation
+executes for longer than this timeout, including when your cluster is just
+temporarily down for more than timeout, the NBD device will detach by itself
+(and possibly break the mounted file system).
+
+You can set timeout to 0 to never detach, but in that case you won't be
+able to remove the kernel device at all if the NBD process dies - you'll have
+to reboot the host.
+
+## nbd_max_devices
+
+- Type: integer
+- Default: 64
+
+Maximum number of NBD devices in the system. This value is passed as
+`nbds_max` parameter for the nbd kernel module when vitastor-nbd autoloads it.
+
+## nbd_max_part
+
+- Type: integer
+- Default: 3
+
+Maximum number of partitions per NBD device. This value is passed as
+`max_part` parameter for the nbd kernel module when vitastor-nbd autoloads it.
+Note that (nbds_max)*(1+max_part) usually can't exceed 256.

docs/config/client.ru.md

@@ -6,7 +6,7 @@
 
 # Параметры клиентского кода
 
-Данные параметры применяются только к клиентам Vitastor (QEMU, fio, NBD) и
+Данные параметры применяются только к клиентам Vitastor (QEMU, fio, NBD и т.п.) и
 затрагивают логику их работы с кластером.
 
 - [client_max_dirty_bytes](#client_max_dirty_bytes)
@@ -15,6 +15,9 @@
 - [client_max_buffered_bytes](#client_max_buffered_bytes)
 - [client_max_buffered_ops](#client_max_buffered_ops)
 - [client_max_writeback_iodepth](#client_max_writeback_iodepth)
+- [nbd_timeout](#nbd_timeout)
+- [nbd_max_devices](#nbd_max_devices)
+- [nbd_max_part](#nbd_max_part)
 
 ## client_max_dirty_bytes
 
@@ -101,3 +104,34 @@
 - Можно менять на лету: да
 
 Максимальное число параллельных операций записи при сбросе буферов на сервер.
+
+## nbd_timeout
+
+- Тип: секунды
+- Значение по умолчанию: 300
+
+Таймаут для операций чтения/записи через [NBD](../usage/nbd.ru.md). Если
+операция выполняется дольше таймаута, включая временную недоступность
+кластера на время, большее таймаута, NBD-устройство отключится само собой
+(и, возможно, сломает примонтированную ФС).
+
+Вы можете установить таймаут в 0, чтобы никогда не отключать устройство по
+таймауту, но в этом случае вы вообще не сможете удалить устройство, если
+процесс NBD умрёт - вам придётся перезагружать сервер.
+
+## nbd_max_devices
+
+- Тип: целое число
+- Значение по умолчанию: 64
+
+Максимальное число NBD-устройств в системе. Данное значение передаётся
+модулю ядра nbd как параметр `nbds_max`, когда его загружает vitastor-nbd.
+
+## nbd_max_part
+
+- Тип: целое число
+- Значение по умолчанию: 3
+
+Максимальное число разделов на одном NBD-устройстве. Данное значение передаётся
+модулю ядра nbd как параметр `max_part`, когда его загружает vitastor-nbd.
+Имейте в виду, что (nbds_max)*(1+max_part) обычно не может превышать 256.

docs/config/osd.en.md

@@ -19,6 +19,7 @@ them, even without restarting by updating configuration in etcd.
 - [autosync_interval](#autosync_interval)
 - [autosync_writes](#autosync_writes)
 - [recovery_queue_depth](#recovery_queue_depth)
+- [recovery_sleep_us](#recovery_sleep_us)
 - [recovery_pg_switch](#recovery_pg_switch)
 - [recovery_sync_batch](#recovery_sync_batch)
 - [readonly](#readonly)
@@ -51,6 +52,13 @@ them, even without restarting by updating configuration in etcd.
 - [scrub_list_limit](#scrub_list_limit)
 - [scrub_find_best](#scrub_find_best)
 - [scrub_ec_max_bruteforce](#scrub_ec_max_bruteforce)
+- [recovery_tune_interval](#recovery_tune_interval)
+- [recovery_tune_util_low](#recovery_tune_util_low)
+- [recovery_tune_util_high](#recovery_tune_util_high)
+- [recovery_tune_client_util_low](#recovery_tune_client_util_low)
+- [recovery_tune_client_util_high](#recovery_tune_client_util_high)
+- [recovery_tune_agg_interval](#recovery_tune_agg_interval)
+- [recovery_tune_sleep_min_us](#recovery_tune_sleep_min_us)
 
 ## etcd_report_interval
 
@@ -135,12 +143,24 @@ operations before issuing an fsync operation internally.
 ## recovery_queue_depth
 
 - Type: integer
-- Default: 4
+- Default: 1
 - Can be changed online: yes
 
-Maximum recovery operations per one primary OSD at any given moment of time.
+Maximum recovery and rebalance operations initiated by each OSD in parallel.
-Currently it's the only parameter available to tune the speed or recovery
+Note that each OSD talks to a lot of other OSDs so actual number of parallel
-and rebalancing, but it's planned to implement more.
+recovery operations per each OSD is greater than just recovery_queue_depth.
+Increasing this parameter can speedup recovery if [auto-tuning](#recovery_tune_interval)
+allows it or if it is disabled.
+
+## recovery_sleep_us
+
+- Type: microseconds
+- Default: 0
+- Can be changed online: yes
+
+Delay for all recovery- and rebalance- related operations. If non-zero,
+such operations are artificially slowed down to reduce the impact on
+client I/O.
 
 ## recovery_pg_switch
 
@@ -508,3 +528,81 @@ the variant with most available equal copies is correct. For example, if
 you have 3 replicas and 1 of them differs, this one is considered to be
 corrupted. But if there is no "best" version with more copies than all
 others have then the object is also marked as inconsistent.
+
+## recovery_tune_interval
+
+- Type: seconds
+- Default: 1
+- Can be changed online: yes
+
+Interval at which OSD re-considers client and recovery load and automatically
+adjusts [recovery_sleep_us](#recovery_sleep_us). Recovery auto-tuning is
+disabled if recovery_tune_interval is set to 0.
+
+Auto-tuning targets utilization. Utilization is a measure of load and is
+equal to the product of iops and average latency (so it may be greater
+than 1). You set "low" and "high" client utilization thresholds and two
+corresponding target recovery utilization levels. OSD calculates desired
+recovery utilization from client utilization using linear interpolation
+and auto-tunes recovery operation delay to make actual recovery utilization
+match desired.
+
+This allows to reduce recovery/rebalance impact on client operations. It is
+of course impossible to remove it completely, but it should become adequate.
+In some tests rebalance could earlier drop client write speed from 1.5 GB/s
+to 50-100 MB/s, with default auto-tuning settings it now only reduces
+to ~1 GB/s.
+
+## recovery_tune_util_low
+
+- Type: number
+- Default: 0.1
+- Can be changed online: yes
+
+Desired recovery/rebalance utilization when client load is high, i.e. when
+it is at or above recovery_tune_client_util_high.
+
+## recovery_tune_util_high
+
+- Type: number
+- Default: 1
+- Can be changed online: yes
+
+Desired recovery/rebalance utilization when client load is low, i.e. when
+it is at or below recovery_tune_client_util_low.
+
+## recovery_tune_client_util_low
+
+- Type: number
+- Default: 0
+- Can be changed online: yes
+
+Client utilization considered "low".
+
+## recovery_tune_client_util_high
+
+- Type: number
+- Default: 0.5
+- Can be changed online: yes
+
+Client utilization considered "high".
+
+## recovery_tune_agg_interval
+
+- Type: integer
+- Default: 10
+- Can be changed online: yes
+
+The number of last auto-tuning iterations to use for calculating the
+delay as average. Lower values result in quicker response to client
+load change, higher values result in more stable delay. Default value of 10
+is usually fine.
+
+## recovery_tune_sleep_min_us
+
+- Type: microseconds
+- Default: 10
+- Can be changed online: yes
+
+Minimum possible value for auto-tuned recovery_sleep_us. Values lower
+than this value are changed to 0.

docs/config/osd.ru.md

@@ -20,6 +20,7 @@
 - [autosync_interval](#autosync_interval)
 - [autosync_writes](#autosync_writes)
 - [recovery_queue_depth](#recovery_queue_depth)
+- [recovery_sleep_us](#recovery_sleep_us)
 - [recovery_pg_switch](#recovery_pg_switch)
 - [recovery_sync_batch](#recovery_sync_batch)
 - [readonly](#readonly)
@@ -52,6 +53,13 @@
 - [scrub_list_limit](#scrub_list_limit)
 - [scrub_find_best](#scrub_find_best)
 - [scrub_ec_max_bruteforce](#scrub_ec_max_bruteforce)
+- [recovery_tune_interval](#recovery_tune_interval)
+- [recovery_tune_util_low](#recovery_tune_util_low)
+- [recovery_tune_util_high](#recovery_tune_util_high)
+- [recovery_tune_client_util_low](#recovery_tune_client_util_low)
+- [recovery_tune_client_util_high](#recovery_tune_client_util_high)
+- [recovery_tune_agg_interval](#recovery_tune_agg_interval)
+- [recovery_tune_sleep_min_us](#recovery_tune_sleep_min_us)
 
 ## etcd_report_interval
 
@@ -138,13 +146,25 @@ OSD, чтобы успевать очищать журнал - без них OSD
 ## recovery_queue_depth
 
 - Тип: целое число
-- Значение по умолчанию: 4
+- Значение по умолчанию: 1
 - Можно менять на лету: да
 
-Максимальное число операций восстановления на одном первичном OSD в любой
+Максимальное число параллельных операций восстановления, инициируемых одним
-момент времени. На данный момент единственный параметр, который можно менять
+OSD в любой момент времени. Имейте в виду, что каждый OSD обычно работает с
-для ускорения или замедления восстановления и перебалансировки данных, но
+многими другими OSD, так что на практике параллелизм восстановления больше,
-в планах реализация других параметров.
+чем просто recovery_queue_depth. Увеличение значения этого параметра может
+ускорить восстановление если [автотюнинг скорости](#recovery_tune_interval)
+разрешает это или если он отключён.
+
+## recovery_sleep_us
+
+- Тип: микросекунды
+- Значение по умолчанию: 0
+- Можно менять на лету: да
+
+Delay for all recovery- and rebalance- related operations. If non-zero,
+such operations are artificially slowed down to reduce the impact on
+client I/O.
 
 ## recovery_pg_switch
 
@@ -535,3 +555,83 @@ EC (кодов коррекции ошибок) с более, чем 1 диск
 считается некорректной. Однако, если "лучшую" версию с числом доступных
 копий большим, чем у всех других версий, найти невозможно, то объект тоже
 маркируется неконсистентным.
+
+## recovery_tune_interval
+
+- Тип: секунды
+- Значение по умолчанию: 1
+- Можно менять на лету: да
+
+Интервал, с которым OSD пересматривает клиентскую нагрузку и нагрузку
+восстановления и автоматически подстраивает [recovery_sleep_us](#recovery_sleep_us).
+Автотюнинг (автоподстройка) отключается, если recovery_tune_interval
+устанавливается в значение 0.
+
+Автотюнинг регулирует утилизацию. Утилизация является мерой нагрузки
+и равна произведению числа операций в секунду и средней задержки
+(то есть, она может быть выше 1). Вы задаёте два уровня клиентской
+утилизации - "низкий" и "высокий" (low и high) и два соответствующих
+целевых уровня утилизации операциями восстановления. OSD рассчитывает
+желаемый уровень утилизации восстановления линейной интерполяцией от
+клиентской утилизации и подстраивает задержку операций восстановления
+так, чтобы фактическая утилизация восстановления совпадала с желаемой.
+
+Это позволяет снизить влияние восстановления и ребаланса на клиентские
+операции. Конечно, невозможно исключить такое влияние полностью, но оно
+должно становиться адекватнее. В некоторых тестах перебалансировка могла
+снижать клиентскую скорость записи с 1.5 ГБ/с до 50-100 МБ/с, а теперь, с
+настройками автотюнинга по умолчанию, она снижается только до ~1 ГБ/с.
+
+## recovery_tune_util_low
+
+- Тип: число
+- Значение по умолчанию: 0.1
+- Можно менять на лету: да
+
+Желаемая утилизация восстановления в моменты, когда клиентская нагрузка
+высокая, то есть, находится на уровне или выше recovery_tune_client_util_high.
+
+## recovery_tune_util_high
+
+- Тип: число
+- Значение по умолчанию: 1
+- Можно менять на лету: да
+
+Желаемая утилизация восстановления в моменты, когда клиентская нагрузка
+низкая, то есть, находится на уровне или ниже recovery_tune_client_util_low.
+
+## recovery_tune_client_util_low
+
+- Тип: число
+- Значение по умолчанию: 0
+- Можно менять на лету: да
+
+Клиентская утилизация, которая считается "низкой".
+
+## recovery_tune_client_util_high
+
+- Тип: число
+- Значение по умолчанию: 0.5
+- Можно менять на лету: да
+
+Клиентская утилизация, которая считается "высокой".
+
+## recovery_tune_agg_interval
+
+- Тип: целое число
+- Значение по умолчанию: 10
+- Можно менять на лету: да
+
+Число последних итераций автоподстройки для расчёта задержки как среднего
+значения. Меньшие значения параметра ускоряют отклик на изменение нагрузки,
+большие значения делают задержку стабильнее. Значение по умолчанию 10
+обычно нормальное и не требует изменений.
+
+## recovery_tune_sleep_min_us
+
+- Тип: микросекунды
+- Значение по умолчанию: 10
+- Можно менять на лету: да
+
+Минимальное возможное значение авто-подстроенного recovery_sleep_us.
+Значения ниже данного заменяются на 0.

docs/config/src/client.en.md

@@ -1,4 +1,4 @@
 # Client Parameters
 
-These parameters apply only to clients and affect their interaction with
+These parameters apply only to Vitastor clients (QEMU, fio, NBD and so on) and
-the cluster.
+affect their interaction with the cluster.

docs/config/src/client.ru.md

@@ -1,4 +1,4 @@
 # Параметры клиентского кода
 
-Данные параметры применяются только к клиентам Vitastor (QEMU, fio, NBD) и
+Данные параметры применяются только к клиентам Vitastor (QEMU, fio, NBD и т.п.) и
 затрагивают логику их работы с кластером.

docs/config/src/client.yml

@@ -122,3 +122,47 @@
     Maximum number of parallel writes when flushing buffered data to the server.
   info_ru: |
     Максимальное число параллельных операций записи при сбросе буферов на сервер.
+- name: nbd_timeout
+  type: sec
+  default: 300
+  online: false
+  info: |
+    Timeout for I/O operations for [NBD](../usage/nbd.en.md). If an operation
+    executes for longer than this timeout, including when your cluster is just
+    temporarily down for more than timeout, the NBD device will detach by itself
+    (and possibly break the mounted file system).
+
+    You can set timeout to 0 to never detach, but in that case you won't be
+    able to remove the kernel device at all if the NBD process dies - you'll have
+    to reboot the host.
+  info_ru: |
+    Таймаут для операций чтения/записи через [NBD](../usage/nbd.ru.md). Если
+    операция выполняется дольше таймаута, включая временную недоступность
+    кластера на время, большее таймаута, NBD-устройство отключится само собой
+    (и, возможно, сломает примонтированную ФС).
+
+    Вы можете установить таймаут в 0, чтобы никогда не отключать устройство по
+    таймауту, но в этом случае вы вообще не сможете удалить устройство, если
+    процесс NBD умрёт - вам придётся перезагружать сервер.
+- name: nbd_max_devices
+  type: int
+  default: 64
+  online: false
+  info: |
+    Maximum number of NBD devices in the system. This value is passed as
+    `nbds_max` parameter for the nbd kernel module when vitastor-nbd autoloads it.
+  info_ru: |
+    Максимальное число NBD-устройств в системе. Данное значение передаётся
+    модулю ядра nbd как параметр `nbds_max`, когда его загружает vitastor-nbd.
+- name: nbd_max_part
+  type: int
+  default: 3
+  online: false
+  info: |
+    Maximum number of partitions per NBD device. This value is passed as
+    `max_part` parameter for the nbd kernel module when vitastor-nbd autoloads it.
+    Note that (nbds_max)*(1+max_part) usually can't exceed 256.
+  info_ru: |
+    Максимальное число разделов на одном NBD-устройстве. Данное значение передаётся
+    модулю ядра nbd как параметр `max_part`, когда его загружает vitastor-nbd.
+    Имейте в виду, что (nbds_max)*(1+max_part) обычно не может превышать 256.

docs/config/src/make.js

@@ -38,6 +38,7 @@ const types = {
         bool: 'boolean',
         int: 'integer',
         sec: 'seconds',
+        float: 'number',
         ms: 'milliseconds',
         us: 'microseconds',
     },
@@ -46,6 +47,7 @@ const types = {
         bool: 'булево (да/нет)',
         int: 'целое число',
         sec: 'секунды',
+        float: 'число',
         ms: 'миллисекунды',
         us: 'микросекунды',
     },

docs/config/src/osd.yml

@@ -107,17 +107,29 @@
     принудительной отправкой fsync-а.
 - name: recovery_queue_depth
   type: int
-  default: 4
+  default: 1
   online: true
   info: |
-    Maximum recovery operations per one primary OSD at any given moment of time.
+    Maximum recovery and rebalance operations initiated by each OSD in parallel.
-    Currently it's the only parameter available to tune the speed or recovery
+    Note that each OSD talks to a lot of other OSDs so actual number of parallel
-    and rebalancing, but it's planned to implement more.
+    recovery operations per each OSD is greater than just recovery_queue_depth.
+    Increasing this parameter can speedup recovery if [auto-tuning](#recovery_tune_interval)
+    allows it or if it is disabled.
   info_ru: |
-    Максимальное число операций восстановления на одном первичном OSD в любой
+    Максимальное число параллельных операций восстановления, инициируемых одним
-    момент времени. На данный момент единственный параметр, который можно менять
+    OSD в любой момент времени. Имейте в виду, что каждый OSD обычно работает с
-    для ускорения или замедления восстановления и перебалансировки данных, но
+    многими другими OSD, так что на практике параллелизм восстановления больше,
-    в планах реализация других параметров.
+    чем просто recovery_queue_depth. Увеличение значения этого параметра может
+    ускорить восстановление если [автотюнинг скорости](#recovery_tune_interval)
+    разрешает это или если он отключён.
+- name: recovery_sleep_us
+  type: us
+  default: 0
+  online: true
+  info: |
+    Delay for all recovery- and rebalance- related operations. If non-zero,
+    such operations are artificially slowed down to reduce the impact on
+    client I/O.
 - name: recovery_pg_switch
   type: int
   default: 128
@@ -626,3 +638,101 @@
     считается некорректной. Однако, если "лучшую" версию с числом доступных
     копий большим, чем у всех других версий, найти невозможно, то объект тоже
     маркируется неконсистентным.
+- name: recovery_tune_interval
+  type: sec
+  default: 1
+  online: true
+  info: |
+    Interval at which OSD re-considers client and recovery load and automatically
+    adjusts [recovery_sleep_us](#recovery_sleep_us). Recovery auto-tuning is
+    disabled if recovery_tune_interval is set to 0.
+
+    Auto-tuning targets utilization. Utilization is a measure of load and is
+    equal to the product of iops and average latency (so it may be greater
+    than 1). You set "low" and "high" client utilization thresholds and two
+    corresponding target recovery utilization levels. OSD calculates desired
+    recovery utilization from client utilization using linear interpolation
+    and auto-tunes recovery operation delay to make actual recovery utilization
+    match desired.
+
+    This allows to reduce recovery/rebalance impact on client operations. It is
+    of course impossible to remove it completely, but it should become adequate.
+    In some tests rebalance could earlier drop client write speed from 1.5 GB/s
+    to 50-100 MB/s, with default auto-tuning settings it now only reduces
+    to ~1 GB/s.
+  info_ru: |
+    Интервал, с которым OSD пересматривает клиентскую нагрузку и нагрузку
+    восстановления и автоматически подстраивает [recovery_sleep_us](#recovery_sleep_us).
+    Автотюнинг (автоподстройка) отключается, если recovery_tune_interval
+    устанавливается в значение 0.
+
+    Автотюнинг регулирует утилизацию. Утилизация является мерой нагрузки
+    и равна произведению числа операций в секунду и средней задержки
+    (то есть, она может быть выше 1). Вы задаёте два уровня клиентской
+    утилизации - "низкий" и "высокий" (low и high) и два соответствующих
+    целевых уровня утилизации операциями восстановления. OSD рассчитывает
+    желаемый уровень утилизации восстановления линейной интерполяцией от
+    клиентской утилизации и подстраивает задержку операций восстановления
+    так, чтобы фактическая утилизация восстановления совпадала с желаемой.
+
+    Это позволяет снизить влияние восстановления и ребаланса на клиентские
+    операции. Конечно, невозможно исключить такое влияние полностью, но оно
+    должно становиться адекватнее. В некоторых тестах перебалансировка могла
+    снижать клиентскую скорость записи с 1.5 ГБ/с до 50-100 МБ/с, а теперь, с
+    настройками автотюнинга по умолчанию, она снижается только до ~1 ГБ/с.
+- name: recovery_tune_util_low
+  type: float
+  default: 0.1
+  online: true
+  info: |
+    Desired recovery/rebalance utilization when client load is high, i.e. when
+    it is at or above recovery_tune_client_util_high.
+  info_ru: |
+    Желаемая утилизация восстановления в моменты, когда клиентская нагрузка
+    высокая, то есть, находится на уровне или выше recovery_tune_client_util_high.
+- name: recovery_tune_util_high
+  type: float
+  default: 1
+  online: true
+  info: |
+    Desired recovery/rebalance utilization when client load is low, i.e. when
+    it is at or below recovery_tune_client_util_low.
+  info_ru: |
+    Желаемая утилизация восстановления в моменты, когда клиентская нагрузка
+    низкая, то есть, находится на уровне или ниже recovery_tune_client_util_low.
+- name: recovery_tune_client_util_low
+  type: float
+  default: 0
+  online: true
+  info: Client utilization considered "low".
+  info_ru: Клиентская утилизация, которая считается "низкой".
+- name: recovery_tune_client_util_high
+  type: float
+  default: 0.5
+  online: true
+  info: Client utilization considered "high".
+  info_ru: Клиентская утилизация, которая считается "высокой".
+- name: recovery_tune_agg_interval
+  type: int
+  default: 10
+  online: true
+  info: |
+    The number of last auto-tuning iterations to use for calculating the
+    delay as average. Lower values result in quicker response to client
+    load change, higher values result in more stable delay. Default value of 10
+    is usually fine.
+  info_ru: |
+    Число последних итераций автоподстройки для расчёта задержки как среднего
+    значения. Меньшие значения параметра ускоряют отклик на изменение нагрузки,
+    большие значения делают задержку стабильнее. Значение по умолчанию 10
+    обычно нормальное и не требует изменений.
+- name: recovery_tune_sleep_min_us
+  type: us
+  default: 10
+  online: true
+  info: |
+    Minimum possible value for auto-tuned recovery_sleep_us. Values lower
+    than this value are changed to 0.
+  info_ru: |
+    Минимальное возможное значение авто-подстроенного recovery_sleep_us.
+    Значения ниже данного заменяются на 0.

docs/installation/kubernetes.en.md

@@ -19,6 +19,14 @@ for i in ./???-*.yaml; do kubectl apply -f $i; done
 
 After that you'll be able to create PersistentVolumes.
 
+**Important:** For best experience, use Linux kernel at least 5.15 with [VDUSE](../usage/qemu.en.md#vduse)
+kernel modules enabled (vdpa, vduse, virtio-vdpa). If your distribution doesn't
+have them pre-built - build them yourself ([instructions](../usage/qemu.en.md#vduse)),
+I promise it's worth it :-). When VDUSE is unavailable, CSI driver uses [NBD](../usage/nbd.en.md)
+to map Vitastor devices. NBD is slower and prone to timeout issues: if Vitastor
+cluster becomes unresponsible for more than [nbd_timeout](../config/client.en.md#nbd_timeout),
+the NBD device detaches and breaks pods using it.
+
 ## Features
 
 Vitastor CSI supports:
@@ -27,5 +35,8 @@ Vitastor CSI supports:
 - Raw block RWX (ReadWriteMany) volumes. Example: [PVC](../../csi/deploy/example-pvc-block.yaml), [pod](../../csi/deploy/example-test-pod-block.yaml)
 - Volume expansion
 - Volume snapshots. Example: [snapshot class](../../csi/deploy/example-snapshot-class.yaml), [snapshot](../../csi/deploy/example-snapshot.yaml), [clone](../../csi/deploy/example-snapshot-clone.yaml)
+- [VDUSE](../usage/qemu.en.md#vduse) (preferred) and [NBD](../usage/nbd.en.md) device mapping methods
+- Upgrades with VDUSE - new handler processes are restarted when CSI pods are restarted themselves
+- Multiple clusters by using multiple configuration files in ConfigMap.
 
 Remember that to use snapshots with CSI you also have to install [Snapshot Controller and CRDs](https://kubernetes-csi.github.io/docs/snapshot-controller.html#deployment).

docs/installation/kubernetes.ru.md

@@ -19,6 +19,14 @@ for i in ./???-*.yaml; do kubectl apply -f $i; done
 
 После этого вы сможете создавать PersistentVolume.
 
+**Важно:** Лучше всего использовать ядро Linux версии не менее 5.15 с включёнными модулями
+[VDUSE](../usage/qemu.ru.md#vduse) (vdpa, vduse, virtio-vdpa). Если в вашем дистрибутиве
+они не собраны из коробки - соберите их сами, обещаю, что это стоит того ([инструкция](../usage/qemu.ru.md#vduse)) :-).
+Когда VDUSE недоступно, CSI-плагин использует [NBD](../usage/nbd.ru.md) для подключения
+дисков, а NBD медленнее и имеет проблему таймаута - если кластер остаётся недоступным
+дольше, чем [nbd_timeout](../config/client.ru.md#nbd_timeout), NBD-устройство отключается
+и ломает поды, использующие его.
+
 ## Возможности
 
 CSI-плагин Vitastor поддерживает:
@@ -27,5 +35,8 @@ CSI-плагин Vitastor поддерживает:
 - Сырые блочные RWX (ReadWriteMany) тома. Пример: [PVC](../../csi/deploy/example-pvc-block.yaml), [под](../../csi/deploy/example-test-pod-block.yaml)
 - Расширение размера томов
 - Снимки томов. Пример: [класс снимков](../../csi/deploy/example-snapshot-class.yaml), [снимок](../../csi/deploy/example-snapshot.yaml), [клон снимка](../../csi/deploy/example-snapshot-clone.yaml)
+- Способы подключения устройств [VDUSE](../usage/qemu.ru.md#vduse) (предпочитаемый) и [NBD](../usage/nbd.ru.md)
+- Обновление при использовании VDUSE - новые процессы-обработчики устройств успешно перезапускаются вместе с самими подами CSI
+- Несколько кластеров через задание нескольких файлов конфигурации в ConfigMap.
 
 Не забывайте, что для использования снимков нужно сначала установить [контроллер снимков и CRD](https://kubernetes-csi.github.io/docs/snapshot-controller.html#deployment).

docs/installation/packages.en.md

@@ -18,7 +18,7 @@
     stable version from 0.9.x branch instead of 1.x
 - For Debian 10 (Buster) also enable backports repository:
   `deb http://deb.debian.org/debian buster-backports main`
-- Install packages: `apt update; apt install vitastor lp-solve etcd linux-image-amd64 qemu`
+- Install packages: `apt update; apt install vitastor lp-solve etcd linux-image-amd64 qemu-system-x86`
 
 ## CentOS
 

docs/installation/packages.ru.md

@@ -18,7 +18,7 @@
     установить последнюю стабильную версию из ветки 0.9.x вместо 1.x
 - Для Debian 10 (Buster) также включите репозиторий backports:
   `deb http://deb.debian.org/debian buster-backports main`
-- Установите пакеты: `apt update; apt install vitastor lp-solve etcd linux-image-amd64 qemu`
+- Установите пакеты: `apt update; apt install vitastor lp-solve etcd linux-image-amd64 qemu-system-x86`
 
 ## CentOS
 

docs/installation/proxmox.en.md

@@ -6,10 +6,10 @@
 
 # Proxmox VE
 
-To enable Vitastor support in Proxmox Virtual Environment (6.4-8.0 are supported):
+To enable Vitastor support in Proxmox Virtual Environment (6.4-8.1 are supported):
 
 - Add the corresponding Vitastor Debian repository into sources.list on Proxmox hosts:
-  bookworm for 8.0, bullseye for 7.4, pve7.3 for 7.3, pve7.2 for 7.2, pve7.1 for 7.1, buster for 6.4
+  bookworm for 8.1, pve8.0 for 8.0, bullseye for 7.4, pve7.3 for 7.3, pve7.2 for 7.2, pve7.1 for 7.1, buster for 6.4
 - Install vitastor-client, pve-qemu-kvm, pve-storage-vitastor (* or see note) packages from Vitastor repository
 - Define storage in `/etc/pve/storage.cfg` (see below)
 - Block network access from VMs to Vitastor network (to OSDs and etcd),
@@ -25,7 +25,7 @@ vitastor: vitastor
     vitastor_pool testpool
     # path to the configuration file
     vitastor_config_path /etc/vitastor/vitastor.conf
-    # etcd address(es), required only if missing in the configuration file
+    # etcd address(es), OPTIONAL, required only if missing in the configuration file
     vitastor_etcd_address 192.168.7.2:2379/v3
     # prefix for keys in etcd
     vitastor_etcd_prefix /vitastor

docs/installation/proxmox.ru.md

@@ -6,10 +6,10 @@
 
 # Proxmox VE
 
-Чтобы подключить Vitastor к Proxmox Virtual Environment (поддерживаются версии 6.4-8.0):
+Чтобы подключить Vitastor к Proxmox Virtual Environment (поддерживаются версии 6.4-8.1):
 
 - Добавьте соответствующий Debian-репозиторий Vitastor в sources.list на хостах Proxmox:
-  bookworm для 8.0, bullseye для 7.4, pve7.3 для 7.3, pve7.2 для 7.2, pve7.1 для 7.1, buster для 6.4
+  bookworm для 8.1, pve8.0 для 8.0, bullseye для 7.4, pve7.3 для 7.3, pve7.2 для 7.2, pve7.1 для 7.1, buster для 6.4
 - Установите пакеты vitastor-client, pve-qemu-kvm, pve-storage-vitastor (* или см. сноску) из репозитория Vitastor
 - Определите тип хранилища в `/etc/pve/storage.cfg` (см. ниже)
 - Обязательно заблокируйте доступ от виртуальных машин к сети Vitastor (OSD и etcd), т.к. Vitastor (пока) не поддерживает аутентификацию
@@ -24,7 +24,7 @@ vitastor: vitastor
     vitastor_pool testpool
     # Путь к файлу конфигурации
     vitastor_config_path /etc/vitastor/vitastor.conf
-    # Адрес(а) etcd, нужны, только если не указаны в vitastor.conf
+    # Адрес(а) etcd, ОПЦИОНАЛЬНЫ, нужны, только если не указаны в vitastor.conf
     vitastor_etcd_address 192.168.7.2:2379/v3
     # Префикс ключей метаданных в etcd
     vitastor_etcd_prefix /vitastor

docs/intro/architecture.ru.md

@@ -54,7 +54,8 @@
   виртуальные диски, их снимки и клоны.
 - **Драйвер QEMU** — подключаемый модуль QEMU, позволяющий QEMU/KVM виртуальным машинам работать
   с виртуальными дисками Vitastor напрямую из пространства пользователя с помощью клиентской
-  библиотеки, без необходимости отображения дисков в виде блочных устройств.
+  библиотеки, без необходимости отображения дисков в виде блочных устройств. Тот же драйвер
+  позволяет подключать диски в систему через [VDUSE](../usage/qemu.ru.md#vduse).
 - **vitastor-nbd** — утилита, позволяющая монтировать образы Vitastor в виде блочных устройств
   с помощью NBD (Network Block Device), на самом деле скорее работающего как "BUSE"
   (Block Device In Userspace). Модуля ядра Linux для выполнения той же задачи в Vitastor нет

docs/intro/features.en.md

@@ -32,6 +32,7 @@
 - [Scrubbing](../config/osd.en.md#auto_scrub) (verification of copies)
 - [Checksums](../config/layout-osd.en.md#data_csum_type)
 - [Client write-back cache](../config/client.en.md#client_enable_writeback)
+- [Intelligent recovery auto-tuning](../config/osd.en.md#recovery_tune_interval)
 
 ## Plugins and tools
 

docs/intro/features.ru.md

@@ -34,6 +34,7 @@
 - [Фоновая проверка целостности](../config/osd.ru.md#auto_scrub) (сверка копий)
 - [Контрольные суммы](../config/layout-osd.ru.md#data_csum_type)
 - [Буферизация записи на стороне клиента](../config/client.ru.md#client_enable_writeback)
+- [Интеллектуальная автоподстройка скорости восстановления](../config/osd.ru.md#recovery_tune_interval)
 
 ## Драйверы и инструменты
 

docs/usage/cli.en.md

@@ -28,7 +28,8 @@ It supports the following commands:
 Global options:
 
 ```
---etcd_address ADDR  Etcd connection address
+--config_file FILE   Path to Vitastor configuration file
+--etcd_address URL   Etcd connection address
 --iodepth N          Send N operations in parallel to each OSD when possible (default 32)
 --parallel_osds M    Work with M osds in parallel when possible (default 4)
 --progress 1|0       Report progress (default 1)

docs/usage/cli.ru.md

@@ -27,7 +27,8 @@ vitastor-cli - интерфейс командной строки для адм
 Глобальные опции:
 
 ```
---etcd_address ADDR  Адрес соединения с etcd
+--config_file FILE   Путь к файлу конфигурации Vitastor
+--etcd_address URL   Адрес соединения с etcd
 --iodepth N          Отправлять параллельно N операций на каждый OSD (по умолчанию 32)
 --parallel_osds M    Работать параллельно с M OSD (по умолчанию 4)
 --progress 1|0       Печатать прогресс выполнения (по умолчанию 1)

docs/usage/disk.en.md

@@ -17,6 +17,7 @@ It supports the following commands:
 - [purge](#purge)
 - [read-sb](#read-sb)
 - [write-sb](#write-sb)
+- [update-sb](#update-sb)
 - [udev](#udev)
 - [exec-osd](#exec-osd)
 - [pre-exec](#pre-exec)
@@ -182,6 +183,14 @@ Try to read Vitastor OSD superblock from `<device>` and print it in JSON format.
 
 Read JSON from STDIN and write it into Vitastor OSD superblock on `<device>`.
 
+## update-sb
+
+`vitastor-disk update-sb <device> [--force] [--<parameter> <value>] [...]`
+
+Read Vitastor OSD superblock from <device>, update parameters in it and write it back.
+
+`--force` allows to ignore validation errors.
+
 ## udev
 
 `vitastor-disk udev <device>`

docs/usage/disk.ru.md

@@ -17,6 +17,7 @@ vitastor-disk - инструмент командной строки для уп
 - [purge](#purge)
 - [read-sb](#read-sb)
 - [write-sb](#write-sb)
+- [update-sb](#update-sb)
 - [udev](#udev)
 - [exec-osd](#exec-osd)
 - [pre-exec](#pre-exec)
@@ -187,6 +188,15 @@ throttle_target_mbs, throttle_target_parallelism, throttle_threshold_us.
 
 Прочитать JSON со стандартного ввода и записать его в суперблок OSD на диск `<device>`.
 
+## update-sb
+
+`vitastor-disk update-sb <device> [--force] [--<параметр> <значение>] [...]`
+
+Прочитать суперблок OSD с диска `<device>`, изменить в нём заданные параметры и записать обратно.
+
+Опция `--force` позволяет читать суперблок, даже если он считается некорректным
+из-за ошибок валидации.
+
 ## udev
 
 `vitastor-disk udev <device>`

docs/usage/fio.en.md

@@ -14,10 +14,13 @@ Vitastor has a fio driver which can be installed from the package vitastor-fio.
 Use the following command as an example to run tests with fio against a Vitastor cluster:
 
 ```
-fio -thread -ioengine=libfio_vitastor.so -name=test -bs=4M -direct=1 -iodepth=16 -rw=write -etcd=10.115.0.10:2379/v3 -image=testimg
+fio -thread -ioengine=libfio_vitastor.so -name=test -bs=4M -direct=1 -iodepth=16 -rw=write -image=testimg
 ```
 
 If you don't want to access your image by name, you can specify pool number, inode number and size
 (`-pool=1 -inode=1 -size=400G`) instead of the image name (`-image=testimg`).
 
-See exact fio commands to use for benchmarking [here](../performance/understanding.en.md#команды-fio).
+You can also specify etcd address(es) explicitly by adding `-etcd=10.115.0.10:2379/v3`, or you
+can override configuration file path by adding `-conf=/etc/vitastor/vitastor.conf`.
+
+See exact fio commands to use for benchmarking [here](../performance/understanding.en.md#fio-commands).

docs/usage/fio.ru.md

@@ -14,10 +14,13 @@
 Используйте следующую команду как пример для запуска тестов кластера Vitastor через fio:
 
 ```
-fio -thread -ioengine=libfio_vitastor.so -name=test -bs=4M -direct=1 -iodepth=16 -rw=write -etcd=10.115.0.10:2379/v3 -image=testimg
+fio -thread -ioengine=libfio_vitastor.so -name=test -bs=4M -direct=1 -iodepth=16 -rw=write -image=testimg
 ```
 
 Вместо обращения к образу по имени (`-image=testimg`) можно указать номер пула, номер инода и размер:
 `-pool=1 -inode=1 -size=400G`.
 
+Вы также можете задать адрес(а) подключения к etcd явно, добавив `-etcd=10.115.0.10:2379/v3`,
+или переопределить путь к файлу конфигурации, добавив `-conf=/etc/vitastor/vitastor.conf`.
+
 Конкретные команды fio для тестирования производительности можно посмотреть [здесь](../performance/understanding.ru.md#команды-fio).

docs/usage/nbd.en.md

@@ -11,25 +11,25 @@ NBD stands for "Network Block Device", but in fact it also functions as "BUSE"
 NBD slighly lowers the performance due to additional overhead, but performance still
 remains decent (see an example [here](../performance/comparison1.en.md#vitastor-0-4-0-nbd)).
 
-Vitastor Kubernetes CSI driver is based on NBD.
+See also [VDUSE](qemu.en.md#vduse) as a better alternative to NBD.
 
-See also [VDUSE](qemu.en.md#vduse).
+Vitastor Kubernetes CSI driver uses NBD when VDUSE is unavailable.
 
 ## Map image
 
 To create a local block device for a Vitastor image run:
 
 ```
-vitastor-nbd map --etcd_address 10.115.0.10:2379/v3 --image testimg
+vitastor-nbd map --image testimg
 ```
 
 It will output a block device name like /dev/nbd0 which you can then use as a normal disk.
 
 You can also use `--pool <POOL> --inode <INODE> --size <SIZE>` instead of `--image <IMAGE>` if you want.
 
-Additional options for map command:
+vitastor-nbd supports all usual Vitastor configuration options like `--config_file <path_to_config>` plus NBD-specific:
 
-* `--nbd_timeout 30` \
+* `--nbd_timeout 300` \
   Timeout for I/O operations in seconds after exceeding which the kernel stops
   the device. You can set it to 0 to disable the timeout, but beware that you
   won't be able to stop the device at all if vitastor-nbd process dies.
@@ -44,6 +44,9 @@ Additional options for map command:
 * `--foreground 1` \
   Stay in foreground, do not daemonize.
 
+Note that `nbd_timeout`, `nbd_max_devices` and `nbd_max_part` options may also be specified
+in `/etc/vitastor/vitastor.conf` or in other configuration file specified with `--config_file`.
+
 ## Unmap image
 
 To unmap the device run:

docs/usage/nbd.ru.md

@@ -14,16 +14,16 @@ NBD на данный момент необходимо, чтобы монтир
 NBD немного снижает производительность из-за дополнительных копирований памяти,
 но она всё равно остаётся на неплохом уровне (см. для примера [тест](../performance/comparison1.ru.md#vitastor-0-4-0-nbd)).
 
-CSI-драйвер Kubernetes Vitastor основан на NBD.
+Смотрите также [VDUSE](qemu.ru.md#vduse), как лучшую альтернативу NBD.
 
-Смотрите также [VDUSE](qemu.ru.md#vduse).
+CSI-драйвер Kubernetes Vitastor использует NBD, когда VDUSE недоступен.
 
 ## Подключить устройство
 
 Чтобы создать локальное блочное устройство для образа, выполните команду:
 
 ```
-vitastor-nbd map --etcd_address 10.115.0.10:2379/v3 --image testimg
+vitastor-nbd map --image testimg
 ```
 
 Команда напечатает название блочного устройства вида /dev/nbd0, которое потом можно
@@ -32,7 +32,8 @@ vitastor-nbd map --etcd_address 10.115.0.10:2379/v3 --image testimg
 Для обращения по номеру инода, аналогично другим командам, можно использовать опции
 `--pool <POOL> --inode <INODE> --size <SIZE>` вместо `--image testimg`.
 
-Дополнительные опции для команды подключения NBD-устройства:
+vitastor-nbd поддерживает все обычные опции Vitastor, например, `--config_file <path_to_config>`,
+плюс специфичные для NBD:
 
 * `--nbd_timeout 30` \
   Максимальное время выполнения любой операции чтения/записи в секундах, при
@@ -53,6 +54,10 @@ vitastor-nbd map --etcd_address 10.115.0.10:2379/v3 --image testimg
 * `--foreground 1` \
   Не уводить процесс в фоновый режим.
 
+Обратите внимание, что опции `nbd_timeout`, `nbd_max_devices` и `nbd_max_part` можно
+также задавать в `/etc/vitastor/vitastor.conf` или в другом файле конфигурации,
+заданном опцией `--config_file`.
+
 ## Отключить устройство
 
 Для отключения устройства выполните:

docs/usage/nfs.en.md

@@ -23,7 +23,7 @@ balancer or any failover method you want to in that case.
 vitastor-nfs usage:
 
 ```
-vitastor-nfs [--etcd_address ADDR] [OTHER OPTIONS]
+vitastor-nfs [STANDARD OPTIONS] [OTHER OPTIONS]
 
 --subdir <DIR>    export images prefixed <DIR>/ (default empty - export all images)
 --portmap 0       do not listen on port 111 (portmap/rpcbind, requires root)
@@ -34,7 +34,7 @@ vitastor-nfs [--etcd_address ADDR] [OTHER OPTIONS]
 --foreground 1    stay in foreground, do not daemonize
 ```
 
-Example start and mount commands:
+Example start and mount commands (etcd_address is optional):
 
 ```
 vitastor-nfs --etcd_address 192.168.5.10:2379 --portmap 0 --port 2050 --pool testpool

docs/usage/nfs.ru.md

@@ -22,7 +22,7 @@
 Использование vitastor-nfs:
 
 ```
-vitastor-nfs [--etcd_address ADDR] [ДРУГИЕ ОПЦИИ]
+vitastor-nfs [СТАНДАРТНЫЕ ОПЦИИ] [ДРУГИЕ ОПЦИИ]
 
 --subdir <DIR>    экспортировать "поддиректорию" - образы с префиксом имени <DIR>/ (по умолчанию пусто - экспортировать все образы)
 --portmap 0       отключить сервис portmap/rpcbind на порту 111 (по умолчанию включён и требует root привилегий)
@@ -33,7 +33,7 @@ vitastor-nfs [--etcd_address ADDR] [ДРУГИЕ ОПЦИИ]
 --foreground 1    не уходить в фон после запуска
 ```
 
-Пример монтирования Vitastor через NFS:
+Пример монтирования Vitastor через NFS (etcd_address необязателен):
 
 ```
 vitastor-nfs --etcd_address 192.168.5.10:2379 --portmap 0 --port 2050 --pool testpool

docs/usage/qemu.en.md

@@ -16,13 +16,16 @@ Old syntax (-drive):
 
 ```
 qemu-system-x86_64 -enable-kvm -m 1024 \
-    -drive 'file=vitastor:etcd_host=192.168.7.2\:2379/v3:image=debian9',
+    -drive 'file=vitastor:image=debian9',
         format=raw,if=none,id=drive-virtio-disk0,cache=none \
     -device 'virtio-blk-pci,scsi=off,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,
         id=virtio-disk0,bootindex=1,write-cache=off' \
     -vnc 0.0.0.0:0
 ```
 
+Etcd address may be specified explicitly by adding `:etcd_host=192.168.7.2\:2379/v3` to `file=`.
+Configuration file path may be overriden by adding `:config_path=/etc/vitastor/vitastor.conf`.
+
 New syntax (-blockdev):
 
 ```
@@ -50,12 +53,12 @@ You can also specify inode ID, pool and size manually instead of `:image=<IMAGE>
 
 ## qemu-img
 
-For qemu-img, you should use `vitastor:etcd_host=<HOST>:image=<IMAGE>` as filename.
+For qemu-img, you should use `vitastor:image=<IMAGE>[:etcd_host=<HOST>]` as filename.
 
 For example, to upload a VM image into Vitastor, run:
 
 ```
-qemu-img convert -f qcow2 debian10.qcow2 -p -O raw 'vitastor:etcd_host=192.168.7.2\:2379/v3:image=debian10'
+qemu-img convert -f qcow2 debian10.qcow2 -p -O raw 'vitastor:image=debian10'
 ```
 
 You can also specify `:pool=<POOL>:inode=<INODE>:size=<SIZE>` instead of `:image=<IMAGE>`
@@ -72,10 +75,10 @@ the snapshot separately using the following commands (key points are using `skip
 `-B backing_file` option):
 
 ```
-qemu-img convert -f raw 'vitastor:etcd_host=192.168.7.2\:2379/v3:image=testimg@0' \
+qemu-img convert -f raw 'vitastor:image=testimg@0' \
     -O qcow2 testimg_0.qcow2
 
-qemu-img convert -f raw 'vitastor:etcd_host=192.168.7.2\:2379/v3:image=testimg:skip-parents=1' \
+qemu-img convert -f raw 'vitastor:image=testimg:skip-parents=1' \
     -O qcow2 -o 'cluster_size=4k' -B testimg_0.qcow2 testimg.qcow2
 ```
 
@@ -146,7 +149,7 @@ Example performance comparison:
 | 4k random read Q1    | 9600 iops   | 7640 iops   | 7780 iops   |
 
 To try VDUSE you need at least Linux 5.15, built with VDUSE support
-(CONFIG_VIRTIO_VDPA=m, CONFIG_VDPA_USER=m, CONFIG_VIRTIO_VDPA=m).
+(CONFIG_VDPA=m, CONFIG_VDPA_USER=m, CONFIG_VIRTIO_VDPA=m).
 
 Debian Linux kernels have these options disabled by now, so if you want to try it on Debian,
 use a kernel from Ubuntu [kernel-ppa/mainline](https://kernel.ubuntu.com/~kernel-ppa/mainline/), Proxmox,

docs/usage/qemu.ru.md

@@ -18,13 +18,16 @@
 
 ```
 qemu-system-x86_64 -enable-kvm -m 1024 \
-    -drive 'file=vitastor:etcd_host=192.168.7.2\:2379/v3:image=debian9',
+    -drive 'file=vitastor:image=debian9',
         format=raw,if=none,id=drive-virtio-disk0,cache=none \
     -device 'virtio-blk-pci,scsi=off,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,
         id=virtio-disk0,bootindex=1,write-cache=off' \
     -vnc 0.0.0.0:0
 ```
 
+Адрес подключения etcd можно задать явно, если добавить `:etcd_host=192.168.7.2\:2379/v3` к `file=`.
+Путь к файлу конфигурации можно переопределить, добавив `:config_path=/etc/vitastor/vitastor.conf`.
+
 Новый синтаксис (-blockdev):
 
 ```
@@ -52,12 +55,12 @@ qemu-system-x86_64 -enable-kvm -m 1024 \
 
 ## qemu-img
 
-Для qemu-img используйте строку `vitastor:etcd_host=<HOST>:image=<IMAGE>` в качестве имени файла диска.
+Для qemu-img используйте строку `vitastor:image=<IMAGE>[:etcd_host=<HOST>]` в качестве имени файла диска.
 
 Например, чтобы загрузить образ диска в Vitastor:
 
 ```
-qemu-img convert -f qcow2 debian10.qcow2 -p -O raw 'vitastor:etcd_host=10.115.0.10\:2379/v3:image=testimg'
+qemu-img convert -f qcow2 debian10.qcow2 -p -O raw 'vitastor:image=testimg'
 ```
 
 Если вы не хотите обращаться к образу по имени, вместо `:image=<IMAGE>` можно указать номер пула, номер инода и размер:
@@ -73,10 +76,10 @@ qemu-img convert -f qcow2 debian10.qcow2 -p -O raw 'vitastor:etcd_host=10.115.0.
 с помощью следующих команд (ключевые моменты - использование `skip-parents=1` и опции `-B backing_file.qcow2`):
 
 ```
-qemu-img convert -f raw 'vitastor:etcd_host=192.168.7.2\:2379/v3:image=testimg@0' \
+qemu-img convert -f raw 'vitastor:image=testimg@0' \
     -O qcow2 testimg_0.qcow2
 
-qemu-img convert -f raw 'vitastor:etcd_host=192.168.7.2\:2379/v3:image=testimg:skip-parents=1' \
+qemu-img convert -f raw 'vitastor:image=testimg:skip-parents=1' \
     -O qcow2 -o 'cluster_size=4k' -B testimg_0.qcow2 testimg.qcow2
 ```
 
@@ -149,7 +152,7 @@ VDUSE - на данный момент лучший интерфейс для п
 | 4k случайное чтение Q1   | 9600 iops   | 7640 iops   | 7780 iops   |
 
 Чтобы попробовать VDUSE, вам нужно ядро Linux как минимум версии 5.15, собранное с поддержкой
-VDUSE (CONFIG_VIRTIO_VDPA=m, CONFIG_VDPA_USER=m, CONFIG_VIRTIO_VDPA=m).
+VDUSE (CONFIG_VDPA=m, CONFIG_VDPA_USER=m, CONFIG_VIRTIO_VDPA=m).
 
 В ядрах в Debian Linux поддержка пока отключена по умолчанию, так что чтобы попробовать VDUSE
 на Debian, поставьте ядро из Ubuntu [kernel-ppa/mainline](https://kernel.ubuntu.com/~kernel-ppa/mainline/),

mon/PGUtil.js

@@ -3,6 +3,7 @@
 
 module.exports = {
     scale_pg_count,
+    scale_pg_history,
 };
 
 function add_pg_history(new_pg_history, new_pg, prev_pgs, prev_pg_history, old_pg)
@@ -43,16 +44,18 @@ function finish_pg_history(merged_history)
     merged_history.all_peers = Object.values(merged_history.all_peers);
 }
 
-function scale_pg_count(prev_pgs, real_prev_pgs, prev_pg_history, new_pg_history, new_pg_count)
+function scale_pg_history(prev_pg_history, prev_pgs, new_pgs)
 {
-    const old_pg_count = real_prev_pgs.length;
+    const new_pg_history = [];
+    const old_pg_count = prev_pgs.length;
+    const new_pg_count = new_pgs.length;
     // Add all possibly intersecting PGs to the history of new PGs
     if (!(new_pg_count % old_pg_count))
     {
         // New PG count is a multiple of old PG count
         for (let i = 0; i < new_pg_count; i++)
         {
-            add_pg_history(new_pg_history, i, real_prev_pgs, prev_pg_history, i % old_pg_count);
+            add_pg_history(new_pg_history, i, prev_pgs, prev_pg_history, i % old_pg_count);
             finish_pg_history(new_pg_history[i]);
         }
     }
@@ -64,7 +67,7 @@ function scale_pg_count(prev_pgs, real_prev_pgs, prev_pg_history, new_pg_history
         {
             for (let j = 0; j < mul; j++)
             {
-                add_pg_history(new_pg_history, i, real_prev_pgs, prev_pg_history, i+j*new_pg_count);
+                add_pg_history(new_pg_history, i, prev_pgs, prev_pg_history, i+j*new_pg_count);
             }
             finish_pg_history(new_pg_history[i]);
         }
@@ -76,7 +79,7 @@ function scale_pg_count(prev_pgs, real_prev_pgs, prev_pg_history, new_pg_history
         let merged_history = {};
         for (let i = 0; i < old_pg_count; i++)
         {
-            add_pg_history(merged_history, 1, real_prev_pgs, prev_pg_history, i);
+            add_pg_history(merged_history, 1, prev_pgs, prev_pg_history, i);
         }
         finish_pg_history(merged_history[1]);
         for (let i = 0; i < new_pg_count; i++)
@@ -89,6 +92,12 @@ function scale_pg_count(prev_pgs, real_prev_pgs, prev_pg_history, new_pg_history
     {
         new_pg_history[i] = null;
     }
+    return new_pg_history;
+}
+
+function scale_pg_count(prev_pgs, new_pg_count)
+{
+    const old_pg_count = prev_pgs.length;
     // Just for the lp_solve optimizer - pick a "previous" PG for each "new" one
     if (prev_pgs.length < new_pg_count)
     {

mon/mon.js

@@ -59,6 +59,7 @@ const etcd_tree = {
             etcd_mon_timeout: 1000, // ms. min: 0
             etcd_mon_retries: 5, // min: 0
             mon_change_timeout: 1000, // ms. min: 100
+            mon_retry_change_timeout: 50, // ms. min: 10
             mon_stats_timeout: 1000, // ms. min: 100
             osd_out_time: 600, // seconds. min: 0
             placement_levels: { datacenter: 1, rack: 2, host: 3, osd: 4, ... },
@@ -110,7 +111,15 @@ const etcd_tree = {
             autosync_interval: 5,
             autosync_writes: 128,
             client_queue_depth: 128, // unused
-            recovery_queue_depth: 4,
+            recovery_queue_depth: 1,
+            recovery_sleep_us: 0,
+            recovery_tune_util_low: 0.1,
+            recovery_tune_client_util_low: 0,
+            recovery_tune_util_high: 1.0,
+            recovery_tune_client_util_high: 0.5,
+            recovery_tune_interval: 1,
+            recovery_tune_agg_interval: 10, // 10 times recovery_tune_interval
+            recovery_tune_sleep_min_us: 10, // 10 microseconds
             recovery_pg_switch: 128,
             recovery_sync_batch: 16,
             no_recovery: false,
@@ -392,7 +401,7 @@ class Mon
         this.parse_etcd_addresses(config.etcd_address||config.etcd_url);
         this.verbose = config.verbose || 0;
         this.initConfig = config;
-        this.config = {};
+        this.config = { ...config };
         this.etcd_prefix = config.etcd_prefix || '/vitastor';
         this.etcd_prefix = this.etcd_prefix.replace(/\/\/+/g, '/').replace(/^\/?(.*[^\/])\/?$/, '/$1');
         this.etcd_start_timeout = (config.etcd_start_timeout || 5) * 1000;
@@ -490,6 +499,11 @@ class Mon
         {
             this.config.mon_change_timeout = 100;
         }
+        this.config.mon_retry_change_timeout = Number(this.config.mon_retry_change_timeout) || 50;
+        if (this.config.mon_retry_change_timeout < 50)
+        {
+            this.config.mon_retry_change_timeout = 50;
+        }
         this.config.mon_stats_timeout = Number(this.config.mon_stats_timeout) || 1000;
         if (this.config.mon_stats_timeout < 100)
         {
@@ -606,7 +620,7 @@ class Mon
                 console.log('etcd websocket timed out, restarting it');
                 this.restart_watcher(cur_addr);
             }
-        }, (Number(this.config.etcd_keepalive_interval) || 30)*1000);
+        }, (Number(this.config.etcd_ws_keepalive_interval) || 30)*1000);
         this.ws.on('error', () => this.restart_watcher(cur_addr));
         this.ws.send(JSON.stringify({
             create_request: {
@@ -1222,6 +1236,89 @@ class Mon
         return aff_osds;
     }
 
+    async generate_pool_pgs(pool_id, osd_tree, levels)
+    {
+        const pool_cfg = this.state.config.pools[pool_id];
+        if (!this.validate_pool_cfg(pool_id, pool_cfg, false))
+        {
+            return null;
+        }
+        let pool_tree = osd_tree[pool_cfg.root_node || ''];
+        pool_tree = pool_tree ? pool_tree.children : [];
+        pool_tree = LPOptimizer.flatten_tree(pool_tree, levels, pool_cfg.failure_domain, 'osd');
+        this.filter_osds_by_tags(osd_tree, pool_tree, pool_cfg.osd_tags);
+        this.filter_osds_by_block_layout(
+            pool_tree,
+            pool_cfg.block_size || this.config.block_size || 131072,
+            pool_cfg.bitmap_granularity || this.config.bitmap_granularity || 4096,
+            pool_cfg.immediate_commit || this.config.immediate_commit || 'none'
+        );
+        // First try last_clean_pgs to minimize data movement
+        let prev_pgs = [];
+        for (const pg in ((this.state.history.last_clean_pgs.items||{})[pool_id]||{}))
+        {
+            prev_pgs[pg-1] = [ ...this.state.history.last_clean_pgs.items[pool_id][pg].osd_set ];
+        }
+        if (!prev_pgs.length)
+        {
+            // Fall back to config/pgs if it's empty
+            for (const pg in ((this.state.config.pgs.items||{})[pool_id]||{}))
+            {
+                prev_pgs[pg-1] = [ ...this.state.config.pgs.items[pool_id][pg].osd_set ];
+            }
+        }
+        const old_pg_count = prev_pgs.length;
+        const optimize_cfg = {
+            osd_tree: pool_tree,
+            pg_count: pool_cfg.pg_count,
+            pg_size: pool_cfg.pg_size,
+            pg_minsize: pool_cfg.pg_minsize,
+            max_combinations: pool_cfg.max_osd_combinations,
+            ordered: pool_cfg.scheme != 'replicated',
+        };
+        let optimize_result;
+        // Re-shuffle PGs if config/pgs.hash is empty
+        if (old_pg_count > 0 && this.state.config.pgs.hash)
+        {
+            if (prev_pgs.length != pool_cfg.pg_count)
+            {
+                // Scale PG count
+                // Do it even if old_pg_count is already equal to pool_cfg.pg_count,
+                // because last_clean_pgs may still contain the old number of PGs
+                PGUtil.scale_pg_count(prev_pgs, pool_cfg.pg_count);
+            }
+            for (const pg of prev_pgs)
+            {
+                while (pg.length < pool_cfg.pg_size)
+                {
+                    pg.push(0);
+                }
+            }
+            optimize_result = await LPOptimizer.optimize_change({
+                prev_pgs,
+                ...optimize_cfg,
+            });
+        }
+        else
+        {
+            optimize_result = await LPOptimizer.optimize_initial(optimize_cfg);
+        }
+        console.log(`Pool ${pool_id} (${pool_cfg.name || 'unnamed'}):`);
+        LPOptimizer.print_change_stats(optimize_result);
+        const pg_effsize = Math.min(pool_cfg.pg_size, Object.keys(pool_tree).length);
+        return {
+            pool_id,
+            pgs: optimize_result.int_pgs,
+            stats: {
+                total_raw_tb: optimize_result.space,
+                pg_real_size: pg_effsize || pool_cfg.pg_size,
+                raw_to_usable: (pg_effsize || pool_cfg.pg_size) / (pool_cfg.scheme === 'replicated'
+                    ? 1 : (pool_cfg.pg_size - (pool_cfg.parity_chunks||0))),
+                space_efficiency: optimize_result.space/(optimize_result.total_space||1),
+            },
+        };
+    }
+
     async recheck_pgs()
     {
         if (this.recheck_pgs_active)
@@ -1236,158 +1333,47 @@ class Mon
         const { up_osds, levels, osd_tree } = this.get_osd_tree();
         const tree_cfg = {
             osd_tree,
+            levels,
             pools: this.state.config.pools,
         };
         const tree_hash = sha1hex(stableStringify(tree_cfg));
         if (this.state.config.pgs.hash != tree_hash)
         {
             // Something has changed
-            const new_config_pgs = JSON.parse(JSON.stringify(this.state.config.pgs));
+            console.log('Pool configuration or OSD tree changed, re-optimizing');
-            const etcd_request = { compare: [], success: [] };
+            // First re-optimize PGs, but don't look at history yet
-            for (const pool_id in (this.state.config.pgs||{}).items||{})
+            const optimize_results = await Promise.all(Object.keys(this.state.config.pools)
+                .map(pool_id => this.generate_pool_pgs(pool_id, osd_tree, levels)));
+            // Then apply the modification in the form of an optimistic transaction,
+            // each time considering new pg/history modifications (OSDs modify it during rebalance)
+            while (!await this.apply_pool_pgs(optimize_results, up_osds, osd_tree, tree_hash))
             {
-                if (!this.state.config.pools[pool_id])
+                console.log(
-                {
+                    'Someone changed PG configuration while we also tried to change it.'+
-                    // Pool deleted. Delete all PGs, but first stop them.
+                    ' Retrying in '+this.config.mon_retry_change_timeout+' ms'
-                    if (!await this.stop_all_pgs(pool_id))
-                    {
-                        this.recheck_pgs_active = false;
-                        this.schedule_recheck();
-                        return;
-                    }
-                    const prev_pgs = [];
-                    for (const pg in this.state.config.pgs.items[pool_id]||{})
-                    {
-                        prev_pgs[pg-1] = this.state.config.pgs.items[pool_id][pg].osd_set;
-                    }
-                    // Also delete pool statistics
-                    etcd_request.success.push({ requestDeleteRange: {
-                        key: b64(this.etcd_prefix+'/pool/stats/'+pool_id),
-                    } });
-                    this.save_new_pgs_txn(new_config_pgs, etcd_request, pool_id, up_osds, osd_tree, prev_pgs, [], []);
-                }
-            }
-            for (const pool_id in this.state.config.pools)
-            {
-                const pool_cfg = this.state.config.pools[pool_id];
-                if (!this.validate_pool_cfg(pool_id, pool_cfg, false))
-                {
-                    continue;
-                }
-                let pool_tree = osd_tree[pool_cfg.root_node || ''];
-                pool_tree = pool_tree ? pool_tree.children : [];
-                pool_tree = LPOptimizer.flatten_tree(pool_tree, levels, pool_cfg.failure_domain, 'osd');
-                this.filter_osds_by_tags(osd_tree, pool_tree, pool_cfg.osd_tags);
-                this.filter_osds_by_block_layout(
-                    pool_tree,
-                    pool_cfg.block_size || this.config.block_size || 131072,
-                    pool_cfg.bitmap_granularity || this.config.bitmap_granularity || 4096,
-                    pool_cfg.immediate_commit || this.config.immediate_commit || 'none'
                 );
-                // These are for the purpose of building history.osd_sets
+                // Failed to apply - parallel change detected. Wait a bit and retry
-                const real_prev_pgs = [];
+                const old_rev = this.etcd_watch_revision;
-                let pg_history = [];
+                while (this.etcd_watch_revision === old_rev)
-                for (const pg in ((this.state.config.pgs.items||{})[pool_id]||{}))
                 {
-                    real_prev_pgs[pg-1] = this.state.config.pgs.items[pool_id][pg].osd_set;
+                    await new Promise(ok => setTimeout(ok, this.config.mon_retry_change_timeout));
-                    if (this.state.pg.history[pool_id] &&
-                        this.state.pg.history[pool_id][pg])
-                    {
-                        pg_history[pg-1] = this.state.pg.history[pool_id][pg];
-                    }
                 }
-                // And these are for the purpose of minimizing data movement
+                const new_ot = this.get_osd_tree();
-                let prev_pgs = [];
+                const new_tcfg = {
-                for (const pg in ((this.state.history.last_clean_pgs.items||{})[pool_id]||{}))
+                    osd_tree: new_ot.osd_tree,
-                {
+                    levels: new_ot.levels,
-                    prev_pgs[pg-1] = this.state.history.last_clean_pgs.items[pool_id][pg].osd_set;
+                    pools: this.state.config.pools,
-                }
-                prev_pgs = JSON.parse(JSON.stringify(prev_pgs.length ? prev_pgs : real_prev_pgs));
-                const old_pg_count = real_prev_pgs.length;
-                const optimize_cfg = {
-                    osd_tree: pool_tree,
-                    pg_count: pool_cfg.pg_count,
-                    pg_size: pool_cfg.pg_size,
-                    pg_minsize: pool_cfg.pg_minsize,
-                    max_combinations: pool_cfg.max_osd_combinations,
-                    ordered: pool_cfg.scheme != 'replicated',
                 };
-                let optimize_result;
+                if (sha1hex(stableStringify(new_tcfg)) !== tree_hash)
-                if (old_pg_count > 0)
                 {
-                    if (old_pg_count != pool_cfg.pg_count)
+                    // Configuration actually changed, restart from the beginning
-                    {
+                    this.recheck_pgs_active = false;
-                        // PG count changed. Need to bring all PGs down.
+                    setImmediate(() => this.recheck_pgs().catch(this.die));
-                        if (!await this.stop_all_pgs(pool_id))
+                    return;
-                        {
-                            this.recheck_pgs_active = false;
-                            this.schedule_recheck();
-                            return;
-                        }
-                    }
-                    if (prev_pgs.length != pool_cfg.pg_count)
-                    {
-                        // Scale PG count
-                        // Do it even if old_pg_count is already equal to pool_cfg.pg_count,
-                        // because last_clean_pgs may still contain the old number of PGs
-                        const new_pg_history = [];
-                        PGUtil.scale_pg_count(prev_pgs, real_prev_pgs, pg_history, new_pg_history, pool_cfg.pg_count);
-                        pg_history = new_pg_history;
-                    }
-                    for (const pg of prev_pgs)
-                    {
-                        while (pg.length < pool_cfg.pg_size)
-                        {
-                            pg.push(0);
-                        }
-                    }
-                    if (!this.state.config.pgs.hash)
-                    {
-                        // Re-shuffle PGs
-                        optimize_result = await LPOptimizer.optimize_initial(optimize_cfg);
-                    }
-                    else
-                    {
-                        optimize_result = await LPOptimizer.optimize_change({
-                            prev_pgs,
-                            ...optimize_cfg,
-                        });
-                    }
                 }
-                else
+                // Configuration didn't change, PG history probably changed, so just retry
-                {
-                    optimize_result = await LPOptimizer.optimize_initial(optimize_cfg);
-                }
-                if (old_pg_count != optimize_result.int_pgs.length)
-                {
-                    console.log(
-                        `PG count for pool ${pool_id} (${pool_cfg.name || 'unnamed'})`+
-                        ` changed from: ${old_pg_count} to ${optimize_result.int_pgs.length}`
-                    );
-                    // Drop stats
-                    etcd_request.success.push({ requestDeleteRange: {
-                        key: b64(this.etcd_prefix+'/pg/stats/'+pool_id+'/'),
-                        range_end: b64(this.etcd_prefix+'/pg/stats/'+pool_id+'0'),
-                    } });
-                }
-                LPOptimizer.print_change_stats(optimize_result);
-                const pg_effsize = Math.min(pool_cfg.pg_size, Object.keys(pool_tree).length);
-                this.state.pool.stats[pool_id] = {
-                    used_raw_tb: (this.state.pool.stats[pool_id]||{}).used_raw_tb || 0,
-                    total_raw_tb: optimize_result.space,
-                    pg_real_size: pg_effsize || pool_cfg.pg_size,
-                    raw_to_usable: (pg_effsize || pool_cfg.pg_size) / (pool_cfg.scheme === 'replicated'
-                        ? 1 : (pool_cfg.pg_size - (pool_cfg.parity_chunks||0))),
-                    space_efficiency: optimize_result.space/(optimize_result.total_space||1),
-                };
-                etcd_request.success.push({ requestPut: {
-                    key: b64(this.etcd_prefix+'/pool/stats/'+pool_id),
-                    value: b64(JSON.stringify(this.state.pool.stats[pool_id])),
-                } });
-                this.save_new_pgs_txn(new_config_pgs, etcd_request, pool_id, up_osds, osd_tree, real_prev_pgs, optimize_result.int_pgs, pg_history);
             }
-            new_config_pgs.hash = tree_hash;
+            console.log('PG configuration successfully changed');
-            await this.save_pg_config(new_config_pgs, etcd_request);
         }
         else
         {
@@ -1434,8 +1420,81 @@ class Mon
         this.recheck_pgs_active = false;
     }
 
-    async save_pg_config(new_config_pgs, etcd_request = { compare: [], success: [] })
+    async apply_pool_pgs(results, up_osds, osd_tree, tree_hash)
     {
+        for (const pool_id in (this.state.config.pgs||{}).items||{})
+        {
+            // We should stop all PGs when deleting a pool or changing its PG count
+            if (!this.state.config.pools[pool_id] ||
+                this.state.config.pgs.items[pool_id] && this.state.config.pools[pool_id].pg_count !=
+                Object.keys(this.state.config.pgs.items[pool_id]).reduce((a, c) => (a < (0|c) ? (0|c) : a), 0))
+            {
+                if (!await this.stop_all_pgs(pool_id))
+                {
+                    return false;
+                }
+            }
+        }
+        const new_config_pgs = JSON.parse(JSON.stringify(this.state.config.pgs));
+        const etcd_request = { compare: [], success: [] };
+        for (const pool_id in (new_config_pgs||{}).items||{})
+        {
+            if (!this.state.config.pools[pool_id])
+            {
+                const prev_pgs = [];
+                for (const pg in new_config_pgs.items[pool_id]||{})
+                {
+                    prev_pgs[pg-1] = new_config_pgs.items[pool_id][pg].osd_set;
+                }
+                // Also delete pool statistics
+                etcd_request.success.push({ requestDeleteRange: {
+                    key: b64(this.etcd_prefix+'/pool/stats/'+pool_id),
+                } });
+                this.save_new_pgs_txn(new_config_pgs, etcd_request, pool_id, up_osds, osd_tree, prev_pgs, [], []);
+            }
+        }
+        for (const pool_res of results)
+        {
+            const pool_id = pool_res.pool_id;
+            const pool_cfg = this.state.config.pools[pool_id];
+            let pg_history = [];
+            for (const pg in ((this.state.config.pgs.items||{})[pool_id]||{}))
+            {
+                if (this.state.pg.history[pool_id] &&
+                    this.state.pg.history[pool_id][pg])
+                {
+                    pg_history[pg-1] = this.state.pg.history[pool_id][pg];
+                }
+            }
+            const real_prev_pgs = [];
+            for (const pg in ((this.state.config.pgs.items||{})[pool_id]||{}))
+            {
+                real_prev_pgs[pg-1] = [ ...this.state.config.pgs.items[pool_id][pg].osd_set ];
+            }
+            if (real_prev_pgs.length > 0 && real_prev_pgs.length != pool_res.pgs.length)
+            {
+                console.log(
+                    `Changing PG count for pool ${pool_id} (${pool_cfg.name || 'unnamed'})`+
+                    ` from: ${real_prev_pgs.length} to ${pool_res.pgs.length}`
+                );
+                pg_history = PGUtil.scale_pg_history(pg_history, real_prev_pgs, pool_res.pgs);
+                // Drop stats
+                etcd_request.success.push({ requestDeleteRange: {
+                    key: b64(this.etcd_prefix+'/pg/stats/'+pool_id+'/'),
+                    range_end: b64(this.etcd_prefix+'/pg/stats/'+pool_id+'0'),
+                } });
+            }
+            const stats = {
+                used_raw_tb: (this.state.pool.stats[pool_id]||{}).used_raw_tb || 0,
+                ...pool_res.stats,
+            };
+            etcd_request.success.push({ requestPut: {
+                key: b64(this.etcd_prefix+'/pool/stats/'+pool_id),
+                value: b64(JSON.stringify(stats)),
+            } });
+            this.save_new_pgs_txn(new_config_pgs, etcd_request, pool_id, up_osds, osd_tree, real_prev_pgs, pool_res.pgs, pg_history);
+        }
+        new_config_pgs.hash = tree_hash;
         etcd_request.compare.push(
             { key: b64(this.etcd_prefix+'/mon/master'), target: 'LEASE', lease: ''+this.etcd_lease_id },
             { key: b64(this.etcd_prefix+'/config/pgs'), target: 'MOD', mod_revision: ''+this.etcd_watch_revision, result: 'LESS' },
@@ -1443,14 +1502,8 @@ class Mon
         etcd_request.success.push(
             { requestPut: { key: b64(this.etcd_prefix+'/config/pgs'), value: b64(JSON.stringify(new_config_pgs)) } },
         );
-        const res = await this.etcd_call('/kv/txn', etcd_request, this.config.etcd_mon_timeout, 0);
+        const txn_res = await this.etcd_call('/kv/txn', etcd_request, this.config.etcd_mon_timeout, 0);
-        if (!res.succeeded)
+        return txn_res.succeeded;
-        {
-            console.log('Someone changed PG configuration while we also tried to change it. Retrying in '+this.config.mon_change_timeout+' ms');
-            this.schedule_recheck();
-            return;
-        }
-        console.log('PG configuration successfully changed');
     }
 
     // Schedule next recheck at least at <unixtime>

mon/package.json

@@ -1,6 +1,6 @@
 {
   "name": "vitastor-mon",
-  "version": "1.2.0",
+  "version": "1.3.1",
   "description": "Vitastor SDS monitor service",
   "main": "mon-main.js",
   "scripts": {

patches/VitastorPlugin.pm

@@ -110,7 +110,6 @@ sub properties
         vitastor_etcd_address => {
             description => 'IP address(es) of etcd.',
             type => 'string',
-            format => 'pve-storage-portal-dns-list',
         },
         vitastor_etcd_prefix => {
             description => 'Prefix for Vitastor etcd metadata',

patches/cinder-vitastor.py

@@ -50,7 +50,7 @@ from cinder.volume import configuration
 from cinder.volume import driver
 from cinder.volume import volume_utils
 
-VERSION = '1.2.0'
+VERSION = '1.3.1'
 
 LOG = logging.getLogger(__name__)
 

patches/pve-qemu-8.1-vitastor.patch

@@ -0,0 +1,190 @@
+Index: pve-qemu-kvm-8.1.2/block/meson.build
+===================================================================
+--- pve-qemu-kvm-8.1.2.orig/block/meson.build
++++ pve-qemu-kvm-8.1.2/block/meson.build
+@@ -123,6 +123,7 @@ foreach m : [
+   [libnfs, 'nfs', files('nfs.c')],
+   [libssh, 'ssh', files('ssh.c')],
+   [rbd, 'rbd', files('rbd.c')],
++  [vitastor, 'vitastor', files('vitastor.c')],
+ ]
+   if m[0].found()
+     module_ss = ss.source_set()
+Index: pve-qemu-kvm-8.1.2/meson.build
+===================================================================
+--- pve-qemu-kvm-8.1.2.orig/meson.build
++++ pve-qemu-kvm-8.1.2/meson.build
+@@ -1303,6 +1303,26 @@ if not get_option('rbd').auto() or have_
+   endif
+ endif
+ 
++vitastor = not_found
++if not get_option('vitastor').auto() or have_block
++  libvitastor_client = cc.find_library('vitastor_client', has_headers: ['vitastor_c.h'],
++    required: get_option('vitastor'))
++  if libvitastor_client.found()
++    if cc.links('''
++      #include <vitastor_c.h>
++      int main(void) {
++        vitastor_c_create_qemu(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
++        return 0;
++      }''', dependencies: libvitastor_client)
++      vitastor = declare_dependency(dependencies: libvitastor_client)
++    elif get_option('vitastor').enabled()
++      error('could not link libvitastor_client')
++    else
++      warning('could not link libvitastor_client, disabling')
++    endif
++  endif
++endif
++
+ glusterfs = not_found
+ glusterfs_ftruncate_has_stat = false
+ glusterfs_iocb_has_stat = false
+@@ -2123,6 +2143,7 @@ if numa.found()
+ endif
+ config_host_data.set('CONFIG_OPENGL', opengl.found())
+ config_host_data.set('CONFIG_RBD', rbd.found())
++config_host_data.set('CONFIG_VITASTOR', vitastor.found())
+ config_host_data.set('CONFIG_RDMA', rdma.found())
+ config_host_data.set('CONFIG_SAFESTACK', get_option('safe_stack'))
+ config_host_data.set('CONFIG_SDL', sdl.found())
+@@ -4298,6 +4319,7 @@ summary_info += {'fdt support':       fd
+ summary_info += {'libcap-ng support': libcap_ng}
+ summary_info += {'bpf support':       libbpf}
+ summary_info += {'rbd support':       rbd}
++summary_info += {'vitastor support':  vitastor}
+ summary_info += {'smartcard support': cacard}
+ summary_info += {'U2F support':       u2f}
+ summary_info += {'libusb':            libusb}
+Index: pve-qemu-kvm-8.1.2/meson_options.txt
+===================================================================
+--- pve-qemu-kvm-8.1.2.orig/meson_options.txt
++++ pve-qemu-kvm-8.1.2/meson_options.txt
+@@ -186,6 +186,8 @@ option('lzo', type : 'feature', value :
+        description: 'lzo compression support')
+ option('rbd', type : 'feature', value : 'auto',
+        description: 'Ceph block device driver')
++option('vitastor', type : 'feature', value : 'auto',
++       description: 'Vitastor block device driver')
+ option('opengl', type : 'feature', value : 'auto',
+        description: 'OpenGL support')
+ option('rdma', type : 'feature', value : 'auto',
+Index: pve-qemu-kvm-8.1.2/qapi/block-core.json
+===================================================================
+--- pve-qemu-kvm-8.1.2.orig/qapi/block-core.json
++++ pve-qemu-kvm-8.1.2/qapi/block-core.json
+@@ -3403,7 +3403,7 @@
+             'raw', 'rbd',
+             { 'name': 'replication', 'if': 'CONFIG_REPLICATION' },
+             'pbs',
+-            'ssh', 'throttle', 'vdi', 'vhdx',
++            'ssh', 'throttle', 'vdi', 'vhdx', 'vitastor',
+             { 'name': 'virtio-blk-vfio-pci', 'if': 'CONFIG_BLKIO' },
+             { 'name': 'virtio-blk-vhost-user', 'if': 'CONFIG_BLKIO' },
+             { 'name': 'virtio-blk-vhost-vdpa', 'if': 'CONFIG_BLKIO' },
+@@ -4465,6 +4465,28 @@
+             '*server': ['InetSocketAddressBase'] } }
+ 
+ ##
++# @BlockdevOptionsVitastor:
++#
++# Driver specific block device options for vitastor
++#
++# @image:       Image name
++# @inode:       Inode number
++# @pool:        Pool ID
++# @size:        Desired image size in bytes
++# @config-path: Path to Vitastor configuration
++# @etcd-host:   etcd connection address(es)
++# @etcd-prefix: etcd key/value prefix
++##
++{ 'struct': 'BlockdevOptionsVitastor',
++  'data': { '*inode': 'uint64',
++            '*pool': 'uint64',
++            '*size': 'uint64',
++            '*image': 'str',
++            '*config-path': 'str',
++            '*etcd-host': 'str',
++            '*etcd-prefix': 'str' } }
++
++##
+ # @ReplicationMode:
+ #
+ # An enumeration of replication modes.
+@@ -4923,6 +4945,7 @@
+       'throttle':   'BlockdevOptionsThrottle',
+       'vdi':        'BlockdevOptionsGenericFormat',
+       'vhdx':       'BlockdevOptionsGenericFormat',
++      'vitastor':   'BlockdevOptionsVitastor',
+       'virtio-blk-vfio-pci':
+                     { 'type': 'BlockdevOptionsVirtioBlkVfioPci',
+                       'if': 'CONFIG_BLKIO' },
+@@ -5360,6 +5383,17 @@
+             '*encrypt' :        'RbdEncryptionCreateOptions' } }
+ 
+ ##
++# @BlockdevCreateOptionsVitastor:
++#
++# Driver specific image creation options for Vitastor.
++#
++# @size: Size of the virtual disk in bytes
++##
++{ 'struct': 'BlockdevCreateOptionsVitastor',
++  'data': { 'location':         'BlockdevOptionsVitastor',
++            'size':             'size' } }
++
++##
+ # @BlockdevVmdkSubformat:
+ #
+ # Subformat options for VMDK images
+@@ -5581,6 +5615,7 @@
+       'ssh':            'BlockdevCreateOptionsSsh',
+       'vdi':            'BlockdevCreateOptionsVdi',
+       'vhdx':           'BlockdevCreateOptionsVhdx',
++      'vitastor':       'BlockdevCreateOptionsVitastor',
+       'vmdk':           'BlockdevCreateOptionsVmdk',
+       'vpc':            'BlockdevCreateOptionsVpc'
+   } }
+Index: pve-qemu-kvm-8.1.2/scripts/ci/org.centos/stream/8/x86_64/configure
+===================================================================
+--- pve-qemu-kvm-8.1.2.orig/scripts/ci/org.centos/stream/8/x86_64/configure
++++ pve-qemu-kvm-8.1.2/scripts/ci/org.centos/stream/8/x86_64/configure
+@@ -30,7 +30,7 @@
+ --with-suffix="qemu-kvm" \
+ --firmwarepath=/usr/share/qemu-firmware \
+ --target-list="x86_64-softmmu" \
+---block-drv-rw-whitelist="qcow2,raw,file,host_device,nbd,iscsi,rbd,blkdebug,luks,null-co,nvme,copy-on-read,throttle,gluster" \
++--block-drv-rw-whitelist="qcow2,raw,file,host_device,nbd,iscsi,rbd,vitastor,blkdebug,luks,null-co,nvme,copy-on-read,throttle,gluster" \
+ --audio-drv-list="" \
+ --block-drv-ro-whitelist="vmdk,vhdx,vpc,https,ssh" \
+ --with-coroutine=ucontext \
+@@ -176,6 +176,7 @@
+ --enable-opengl \
+ --enable-pie \
+ --enable-rbd \
++--enable-vitastor \
+ --enable-rdma \
+ --enable-seccomp \
+ --enable-snappy \
+Index: pve-qemu-kvm-8.1.2/scripts/meson-buildoptions.sh
+===================================================================
+--- pve-qemu-kvm-8.1.2.orig/scripts/meson-buildoptions.sh
++++ pve-qemu-kvm-8.1.2/scripts/meson-buildoptions.sh
+@@ -153,6 +153,7 @@ meson_options_help() {
+   printf "%s\n" '  qed             qed image format support'
+   printf "%s\n" '  qga-vss         build QGA VSS support (broken with MinGW)'
+   printf "%s\n" '  rbd             Ceph block device driver'
++  printf "%s\n" '  vitastor        Vitastor block device driver'
+   printf "%s\n" '  rdma            Enable RDMA-based migration'
+   printf "%s\n" '  replication     replication support'
+   printf "%s\n" '  sdl             SDL user interface'
+@@ -416,6 +417,8 @@ _meson_option_parse() {
+     --disable-qom-cast-debug) printf "%s" -Dqom_cast_debug=false ;;
+     --enable-rbd) printf "%s" -Drbd=enabled ;;
+     --disable-rbd) printf "%s" -Drbd=disabled ;;
++    --enable-vitastor) printf "%s" -Dvitastor=enabled ;;
++    --disable-vitastor) printf "%s" -Dvitastor=disabled ;;
+     --enable-rdma) printf "%s" -Drdma=enabled ;;
+     --disable-rdma) printf "%s" -Drdma=disabled ;;
+     --enable-replication) printf "%s" -Dreplication=enabled ;;

patches/qemu-8.1-vitastor.patch

@@ -0,0 +1,190 @@
+diff --git a/block/meson.build b/block/meson.build
+index 529fc172c6..d542dc0609 100644
+--- a/block/meson.build
++++ b/block/meson.build
+@@ -110,6 +110,7 @@ foreach m : [
+   [libnfs, 'nfs', files('nfs.c')],
+   [libssh, 'ssh', files('ssh.c')],
+   [rbd, 'rbd', files('rbd.c')],
++  [vitastor, 'vitastor', files('vitastor.c')],
+ ]
+   if m[0].found()
+     module_ss = ss.source_set()
+diff --git a/meson.build b/meson.build
+index a9c4f28247..8496cf13f1 100644
+--- a/meson.build
++++ b/meson.build
+@@ -1303,6 +1303,26 @@ if not get_option('rbd').auto() or have_block
+   endif
+ endif
+ 
++vitastor = not_found
++if not get_option('vitastor').auto() or have_block
++  libvitastor_client = cc.find_library('vitastor_client', has_headers: ['vitastor_c.h'],
++    required: get_option('vitastor'))
++  if libvitastor_client.found()
++    if cc.links('''
++      #include <vitastor_c.h>
++      int main(void) {
++        vitastor_c_create_qemu(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
++        return 0;
++      }''', dependencies: libvitastor_client)
++      vitastor = declare_dependency(dependencies: libvitastor_client)
++    elif get_option('vitastor').enabled()
++      error('could not link libvitastor_client')
++    else
++      warning('could not link libvitastor_client, disabling')
++    endif
++  endif
++endif
++
+ glusterfs = not_found
+ glusterfs_ftruncate_has_stat = false
+ glusterfs_iocb_has_stat = false
+@@ -2119,6 +2139,7 @@ if numa.found()
+ endif
+ config_host_data.set('CONFIG_OPENGL', opengl.found())
+ config_host_data.set('CONFIG_RBD', rbd.found())
++config_host_data.set('CONFIG_VITASTOR', vitastor.found())
+ config_host_data.set('CONFIG_RDMA', rdma.found())
+ config_host_data.set('CONFIG_SAFESTACK', get_option('safe_stack'))
+ config_host_data.set('CONFIG_SDL', sdl.found())
+@@ -4286,6 +4307,7 @@ summary_info += {'fdt support':       fdt_opt == 'disabled' ? false : fdt_opt}
+ summary_info += {'libcap-ng support': libcap_ng}
+ summary_info += {'bpf support':       libbpf}
+ summary_info += {'rbd support':       rbd}
++summary_info += {'vitastor support':  vitastor}
+ summary_info += {'smartcard support': cacard}
+ summary_info += {'U2F support':       u2f}
+ summary_info += {'libusb':            libusb}
+diff --git a/meson_options.txt b/meson_options.txt
+index ae6d8f469d..e3d9f8404d 100644
+--- a/meson_options.txt
++++ b/meson_options.txt
+@@ -186,6 +186,8 @@ option('lzo', type : 'feature', value : 'auto',
+        description: 'lzo compression support')
+ option('rbd', type : 'feature', value : 'auto',
+        description: 'Ceph block device driver')
++option('vitastor', type : 'feature', value : 'auto',
++       description: 'Vitastor block device driver')
+ option('opengl', type : 'feature', value : 'auto',
+        description: 'OpenGL support')
+ option('rdma', type : 'feature', value : 'auto',
+diff --git a/qapi/block-core.json b/qapi/block-core.json
+index 2b1d493d6e..90673fdbdc 100644
+--- a/qapi/block-core.json
++++ b/qapi/block-core.json
+@@ -3146,7 +3146,7 @@
+             'parallels', 'preallocate', 'qcow', 'qcow2', 'qed', 'quorum',
+             'raw', 'rbd',
+             { 'name': 'replication', 'if': 'CONFIG_REPLICATION' },
+-            'ssh', 'throttle', 'vdi', 'vhdx',
++            'ssh', 'throttle', 'vdi', 'vhdx', 'vitastor',
+             { 'name': 'virtio-blk-vfio-pci', 'if': 'CONFIG_BLKIO' },
+             { 'name': 'virtio-blk-vhost-user', 'if': 'CONFIG_BLKIO' },
+             { 'name': 'virtio-blk-vhost-vdpa', 'if': 'CONFIG_BLKIO' },
+@@ -4196,6 +4196,28 @@
+             '*key-secret': 'str',
+             '*server': ['InetSocketAddressBase'] } }
+ 
++##
++# @BlockdevOptionsVitastor:
++#
++# Driver specific block device options for vitastor
++#
++# @image:       Image name
++# @inode:       Inode number
++# @pool:        Pool ID
++# @size:        Desired image size in bytes
++# @config-path: Path to Vitastor configuration
++# @etcd-host:   etcd connection address(es)
++# @etcd-prefix: etcd key/value prefix
++##
++{ 'struct': 'BlockdevOptionsVitastor',
++  'data': { '*inode': 'uint64',
++            '*pool': 'uint64',
++            '*size': 'uint64',
++            '*image': 'str',
++            '*config-path': 'str',
++            '*etcd-host': 'str',
++            '*etcd-prefix': 'str' } }
++
+ ##
+ # @ReplicationMode:
+ #
+@@ -4654,6 +4676,7 @@
+       'throttle':   'BlockdevOptionsThrottle',
+       'vdi':        'BlockdevOptionsGenericFormat',
+       'vhdx':       'BlockdevOptionsGenericFormat',
++      'vitastor':   'BlockdevOptionsVitastor',
+       'virtio-blk-vfio-pci':
+                     { 'type': 'BlockdevOptionsVirtioBlkVfioPci',
+                       'if': 'CONFIG_BLKIO' },
+@@ -5089,6 +5112,17 @@
+             '*cluster-size' :   'size',
+             '*encrypt' :        'RbdEncryptionCreateOptions' } }
+ 
++##
++# @BlockdevCreateOptionsVitastor:
++#
++# Driver specific image creation options for Vitastor.
++#
++# @size: Size of the virtual disk in bytes
++##
++{ 'struct': 'BlockdevCreateOptionsVitastor',
++  'data': { 'location':         'BlockdevOptionsVitastor',
++            'size':             'size' } }
++
+ ##
+ # @BlockdevVmdkSubformat:
+ #
+@@ -5311,6 +5345,7 @@
+       'ssh':            'BlockdevCreateOptionsSsh',
+       'vdi':            'BlockdevCreateOptionsVdi',
+       'vhdx':           'BlockdevCreateOptionsVhdx',
++      'vitastor':       'BlockdevCreateOptionsVitastor',
+       'vmdk':           'BlockdevCreateOptionsVmdk',
+       'vpc':            'BlockdevCreateOptionsVpc'
+   } }
+diff --git a/scripts/ci/org.centos/stream/8/x86_64/configure b/scripts/ci/org.centos/stream/8/x86_64/configure
+index d02b09a4b9..f0b5fbfef3 100755
+--- a/scripts/ci/org.centos/stream/8/x86_64/configure
++++ b/scripts/ci/org.centos/stream/8/x86_64/configure
+@@ -30,7 +30,7 @@
+ --with-suffix="qemu-kvm" \
+ --firmwarepath=/usr/share/qemu-firmware \
+ --target-list="x86_64-softmmu" \
+---block-drv-rw-whitelist="qcow2,raw,file,host_device,nbd,iscsi,rbd,blkdebug,luks,null-co,nvme,copy-on-read,throttle,gluster" \
++--block-drv-rw-whitelist="qcow2,raw,file,host_device,nbd,iscsi,rbd,vitastor,blkdebug,luks,null-co,nvme,copy-on-read,throttle,gluster" \
+ --audio-drv-list="" \
+ --block-drv-ro-whitelist="vmdk,vhdx,vpc,https,ssh" \
+ --with-coroutine=ucontext \
+@@ -176,6 +176,7 @@
+ --enable-opengl \
+ --enable-pie \
+ --enable-rbd \
++--enable-vitastor \
+ --enable-rdma \
+ --enable-seccomp \
+ --enable-snappy \
+diff --git a/scripts/meson-buildoptions.sh b/scripts/meson-buildoptions.sh
+index d7020af175..94958eb6fa 100644
+--- a/scripts/meson-buildoptions.sh
++++ b/scripts/meson-buildoptions.sh
+@@ -153,6 +153,7 @@ meson_options_help() {
+   printf "%s\n" '  qed             qed image format support'
+   printf "%s\n" '  qga-vss         build QGA VSS support (broken with MinGW)'
+   printf "%s\n" '  rbd             Ceph block device driver'
++  printf "%s\n" '  vitastor        Vitastor block device driver'
+   printf "%s\n" '  rdma            Enable RDMA-based migration'
+   printf "%s\n" '  replication     replication support'
+   printf "%s\n" '  sdl             SDL user interface'
+@@ -416,6 +417,8 @@ _meson_option_parse() {
+     --disable-qom-cast-debug) printf "%s" -Dqom_cast_debug=false ;;
+     --enable-rbd) printf "%s" -Drbd=enabled ;;
+     --disable-rbd) printf "%s" -Drbd=disabled ;;
++    --enable-vitastor) printf "%s" -Dvitastor=enabled ;;
++    --disable-vitastor) printf "%s" -Dvitastor=disabled ;;
+     --enable-rdma) printf "%s" -Drdma=enabled ;;
+     --disable-rdma) printf "%s" -Drdma=disabled ;;
+     --enable-replication) printf "%s" -Dreplication=enabled ;;

rpm/build-tarball.sh

@@ -24,4 +24,4 @@ rm fio
 mv fio-copy fio
 FIO=`rpm -qi fio | perl -e 'while(<>) { /^Epoch[\s:]+(\S+)/ && print "$1:"; /^Version[\s:]+(\S+)/ && print $1; /^Release[\s:]+(\S+)/ && print "-$1"; }'`
 perl -i -pe 's/(Requires:\s*fio)([^\n]+)?/$1 = '$FIO'/' $VITASTOR/rpm/vitastor-el$EL.spec
-tar --transform 's#^#vitastor-1.2.0/#' --exclude 'rpm/*.rpm' -czf $VITASTOR/../vitastor-1.2.0$(rpm --eval '%dist').tar.gz *
+tar --transform 's#^#vitastor-1.3.1/#' --exclude 'rpm/*.rpm' -czf $VITASTOR/../vitastor-1.3.1$(rpm --eval '%dist').tar.gz *

rpm/vitastor-el7.Dockerfile

@@ -15,6 +15,7 @@ RUN yumdownloader --disablerepo=centos-sclo-rh --source fio
 RUN rpm --nomd5 -i fio*.src.rpm
 RUN rm -f /etc/yum.repos.d/CentOS-Media.repo
 RUN cd ~/rpmbuild/SPECS && yum-builddep -y fio.spec
+RUN yum -y install cmake3
 
 ADD https://vitastor.io/rpms/liburing-el7/liburing-0.7-2.el7.src.rpm /root
 
@@ -35,7 +36,7 @@ ADD . /root/vitastor
 RUN set -e; \
     cd /root/vitastor/rpm; \
     sh build-tarball.sh; \
-    cp /root/vitastor-1.2.0.el7.tar.gz ~/rpmbuild/SOURCES; \
+    cp /root/vitastor-1.3.1.el7.tar.gz ~/rpmbuild/SOURCES; \
     cp vitastor-el7.spec ~/rpmbuild/SPECS/vitastor.spec; \
     cd ~/rpmbuild/SPECS/; \
     rpmbuild -ba vitastor.spec; \

rpm/vitastor-el7.spec

@@ -1,11 +1,11 @@
 Name:           vitastor
-Version:        1.2.0
+Version:        1.3.1
 Release:        1%{?dist}
 Summary:        Vitastor, a fast software-defined clustered block storage
 
 License:        Vitastor Network Public License 1.1
 URL:            https://vitastor.io/
-Source0:        vitastor-1.2.0.el7.tar.gz
+Source0:        vitastor-1.3.1.el7.tar.gz
 
 BuildRequires:  liburing-devel >= 0.6
 BuildRequires:  gperftools-devel
@@ -16,7 +16,7 @@ BuildRequires:  jerasure-devel
 BuildRequires:  libisa-l-devel
 BuildRequires:  gf-complete-devel
 BuildRequires:  libibverbs-devel
-BuildRequires:  cmake
+BuildRequires:  cmake3
 Requires:       vitastor-osd = %{version}-%{release}
 Requires:       vitastor-mon = %{version}-%{release}
 Requires:       vitastor-client = %{version}-%{release}
@@ -94,7 +94,7 @@ Vitastor fio drivers for benchmarking.
 
 %build
 . /opt/rh/devtoolset-9/enable
-%cmake .
+%cmake3 .
 %make_build
 
 

rpm/vitastor-el8.Dockerfile

@@ -35,7 +35,7 @@ ADD . /root/vitastor
 RUN set -e; \
     cd /root/vitastor/rpm; \
     sh build-tarball.sh; \
-    cp /root/vitastor-1.2.0.el8.tar.gz ~/rpmbuild/SOURCES; \
+    cp /root/vitastor-1.3.1.el8.tar.gz ~/rpmbuild/SOURCES; \
     cp vitastor-el8.spec ~/rpmbuild/SPECS/vitastor.spec; \
     cd ~/rpmbuild/SPECS/; \
     rpmbuild -ba vitastor.spec; \

rpm/vitastor-el8.spec

@@ -1,11 +1,11 @@
 Name:           vitastor
-Version:        1.2.0
+Version:        1.3.1
 Release:        1%{?dist}
 Summary:        Vitastor, a fast software-defined clustered block storage
 
 License:        Vitastor Network Public License 1.1
 URL:            https://vitastor.io/
-Source0:        vitastor-1.2.0.el8.tar.gz
+Source0:        vitastor-1.3.1.el8.tar.gz
 
 BuildRequires:  liburing-devel >= 0.6
 BuildRequires:  gperftools-devel

rpm/vitastor-el9.Dockerfile

@@ -18,7 +18,7 @@ ADD . /root/vitastor
 RUN set -e; \
     cd /root/vitastor/rpm; \
     sh build-tarball.sh; \
-    cp /root/vitastor-1.2.0.el9.tar.gz ~/rpmbuild/SOURCES; \
+    cp /root/vitastor-1.3.1.el9.tar.gz ~/rpmbuild/SOURCES; \
     cp vitastor-el9.spec ~/rpmbuild/SPECS/vitastor.spec; \
     cd ~/rpmbuild/SPECS/; \
     rpmbuild -ba vitastor.spec; \

rpm/vitastor-el9.spec

@@ -1,11 +1,11 @@
 Name:           vitastor
-Version:        1.2.0
+Version:        1.3.1
 Release:        1%{?dist}
 Summary:        Vitastor, a fast software-defined clustered block storage
 
 License:        Vitastor Network Public License 1.1
 URL:            https://vitastor.io/
-Source0:        vitastor-1.2.0.el9.tar.gz
+Source0:        vitastor-1.3.1.el9.tar.gz
 
 BuildRequires:  liburing-devel >= 0.6
 BuildRequires:  gperftools-devel

src/CMakeLists.txt

@@ -16,7 +16,7 @@ if("${CMAKE_INSTALL_PREFIX}" MATCHES "^/usr/local/?$")
 	set(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}")
 endif()
 
-add_definitions(-DVERSION="1.2.0")
+add_definitions(-DVERSION="1.3.1")
 add_definitions(-Wall -Wno-sign-compare -Wno-comment -Wno-parentheses -Wno-pointer-arith -fdiagnostics-color=always -fno-omit-frame-pointer -I ${CMAKE_SOURCE_DIR}/src)
 add_link_options(-fno-omit-frame-pointer)
 if (${WITH_ASAN})
@@ -181,6 +181,25 @@ target_link_libraries(vitastor-nbd
 	vitastor_client
 )
 
+# vitastor-kv
+add_executable(vitastor-kv
+	kv_cli.cpp
+	kv_db.cpp
+	kv_db.h
+)
+target_link_libraries(vitastor-kv
+	vitastor_client
+)
+
+add_executable(vitastor-kv-stress
+	kv_stress.cpp
+	kv_db.cpp
+	kv_db.h
+)
+target_link_libraries(vitastor-kv-stress
+	vitastor_client
+)
+
 # vitastor-nfs
 add_executable(vitastor-nfs
 	nfs_proxy.cpp

src/addr_util.cpp

@@ -8,6 +8,7 @@
 #include <stdio.h>
 
 #include <stdexcept>
+#include <set>
 
 #include "addr_util.h"
 
@@ -135,7 +136,7 @@ std::vector<std::string> getifaddr_list(std::vector<std::string> mask_cfg, bool
             throw std::runtime_error((include_v6 ? "Invalid IPv4 address mask: " : "Invalid IP address mask: ") + mask);
         }
     }
-    std::vector<std::string> addresses;
+    std::set<std::string> addresses;
     ifaddrs *list, *ifa;
     if (getifaddrs(&list) == -1)
     {
@@ -149,7 +150,8 @@ std::vector<std::string> getifaddr_list(std::vector<std::string> mask_cfg, bool
         }
         int family = ifa->ifa_addr->sa_family;
         if ((family == AF_INET || family == AF_INET6 && include_v6) &&
-            (ifa->ifa_flags & (IFF_UP | IFF_RUNNING | IFF_LOOPBACK)) == (IFF_UP | IFF_RUNNING))
+            // Do not skip loopback addresses if the address filter is specified
+            (ifa->ifa_flags & (IFF_UP | IFF_RUNNING | (masks.size() ? 0 : IFF_LOOPBACK))) == (IFF_UP | IFF_RUNNING))
         {
             void *addr_ptr;
             if (family == AF_INET)
@@ -182,11 +184,11 @@ std::vector<std::string> getifaddr_list(std::vector<std::string> mask_cfg, bool
             {
                 throw std::runtime_error(std::string("inet_ntop: ") + strerror(errno));
             }
-            addresses.push_back(std::string(addr));
+            addresses.insert(std::string(addr));
         }
     }
     freeifaddrs(list);
-    return addresses;
+    return std::vector<std::string>(addresses.begin(), addresses.end());
 }
 
 int create_and_bind_socket(std::string bind_address, int bind_port, int listen_backlog, int *listening_port)

src/blockstore_impl.h

@@ -277,6 +277,7 @@ class blockstore_impl_t
     int unsynced_big_write_count = 0, unstable_unsynced = 0;
     int unsynced_queued_ops = 0;
     allocator *data_alloc = NULL;
+    uint64_t used_blocks = 0;
     uint8_t *zero_object;
 
     void *metadata_buffer = NULL;
@@ -430,7 +431,7 @@ public:
 
     inline uint32_t get_block_size() { return dsk.data_block_size; }
     inline uint64_t get_block_count() { return dsk.block_count; }
-    inline uint64_t get_free_block_count() { return data_alloc->get_free_count(); }
+    inline uint64_t get_free_block_count() { return dsk.block_count - used_blocks; }
     inline uint32_t get_bitmap_granularity() { return dsk.disk_alignment; }
     inline uint64_t get_journal_size() { return dsk.journal_len; }
 };

src/blockstore_init.cpp

@@ -376,6 +376,7 @@ bool blockstore_init_meta::handle_meta_block(uint8_t *buf, uint64_t entries_per_
                 else
                 {
                     bs->inode_space_stats[entry->oid.inode] += bs->dsk.data_block_size;
+                    bs->used_blocks++;
                 }
                 entries_loaded++;
 #ifdef BLOCKSTORE_DEBUG
@@ -732,8 +733,9 @@ int blockstore_init_journal::handle_journal_part(void *buf, uint64_t done_pos, u
     resume:
         while (pos < bs->journal.block_size)
         {
-            journal_entry *je = (journal_entry*)((uint8_t*)buf + proc_pos - done_pos + pos);
+            auto buf_pos = proc_pos - done_pos + pos;
-            if (je->magic != JOURNAL_MAGIC || je_crc32(je) != je->crc32 ||
+            journal_entry *je = (journal_entry*)((uint8_t*)buf + buf_pos);
+            if (je->magic != JOURNAL_MAGIC || buf_pos+je->size > len || je_crc32(je) != je->crc32 ||
                 je->type < JE_MIN || je->type > JE_MAX || started && je->crc32_prev != crc32_last)
             {
                 if (pos == 0)
@@ -1180,6 +1182,7 @@ void blockstore_init_journal::erase_dirty_object(blockstore_dirty_db_t::iterator
             sp -= bs->dsk.data_block_size;
         else
             bs->inode_space_stats.erase(oid.inode);
+        bs->used_blocks--;
     }
     bs->erase_dirty(dirty_it, dirty_end, clean_loc);
     // Remove it from the flusher's queue, too

src/blockstore_journal.cpp

@@ -144,8 +144,10 @@ journal_entry* prefill_single_journal_entry(journal_t & journal, uint16_t type,
         journal.sector_info[journal.cur_sector].written = false;
         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;
+        auto next_next_free = (journal.next_free+journal.block_size) < journal.len ? journal.next_free + journal.block_size : journal.block_size;
-        assert(journal.next_free != journal.used_start);
+        // double check that next_free doesn't cross used_start from the left
+        assert(journal.next_free >= journal.used_start || next_next_free < journal.used_start);
+        journal.next_free = next_next_free;
         memset(journal.inmemory
             ? (uint8_t*)journal.buffer + journal.sector_info[journal.cur_sector].offset
             : (uint8_t*)journal.sector_buf + journal.block_size*journal.cur_sector, 0, journal.block_size);

src/blockstore_stable.cpp

@@ -445,6 +445,7 @@ void blockstore_impl_t::mark_stable(const obj_ver_id & v, bool forget_dirty)
                     if (!exists)
                     {
                         inode_space_stats[dirty_it->first.oid.inode] += dsk.data_block_size;
+                        used_blocks++;
                     }
                     big_to_flush++;
                 }
@@ -455,6 +456,7 @@ void blockstore_impl_t::mark_stable(const obj_ver_id & v, bool forget_dirty)
                         sp -= dsk.data_block_size;
                     else
                         inode_space_stats.erase(dirty_it->first.oid.inode);
+                    used_blocks--;
                     big_to_flush++;
                 }
             }

src/blockstore_write.cpp

@@ -386,7 +386,7 @@ int blockstore_impl_t::dequeue_write(blockstore_op_t *op)
             sqe, dsk.data_fd, PRIV(op)->iov_zerofill, vcnt, dsk.data_offset + (loc << dsk.block_order) + op->offset - stripe_offset
         );
         PRIV(op)->pending_ops = 1;
-        if (immediate_commit != IMMEDIATE_ALL && !(dirty_it->second.state & BS_ST_INSTANT))
+        if (!(dirty_it->second.state & BS_ST_INSTANT))
         {
             unstable_unsynced++;
         }
@@ -412,7 +412,7 @@ int blockstore_impl_t::dequeue_write(blockstore_op_t *op)
                 sizeof(journal_entry_big_write) + dsk.clean_dyn_size, 0)
             || !space_check.check_available(op, 1,
                 sizeof(journal_entry_small_write) + dyn_size,
-                (unstable_writes.size()+unstable_unsynced)*journal.block_size))
+                op->len + (unstable_writes.size()+unstable_unsynced)*journal.block_size))
         {
             return 0;
         }
@@ -462,6 +462,8 @@ int blockstore_impl_t::dequeue_write(blockstore_op_t *op)
                 exit(1);
             }
         }
+        // double check that next_free doesn't cross used_start from the left
+        assert(journal.next_free >= journal.used_start || next_next_free < journal.used_start);
         journal.next_free = next_next_free;
         je->oid = op->oid;
         je->version = op->version;
@@ -499,13 +501,13 @@ int blockstore_impl_t::dequeue_write(blockstore_op_t *op)
         }
         dirty_it->second.location = journal.next_free;
         dirty_it->second.state = (dirty_it->second.state & ~BS_ST_WORKFLOW_MASK) | BS_ST_SUBMITTED;
-        journal.next_free += op->len;
+        next_next_free = journal.next_free + op->len;
-        if (journal.next_free >= journal.len)
+        if (next_next_free >= journal.len)
-        {
+            next_next_free = dsk.journal_block_size;
-            journal.next_free = dsk.journal_block_size;
+        // double check that next_free doesn't cross used_start from the left
-            assert(journal.next_free != journal.used_start);
+        assert(journal.next_free >= journal.used_start || next_next_free < journal.used_start);
-        }
+        journal.next_free = next_next_free;
-        if (immediate_commit == IMMEDIATE_NONE && !(dirty_it->second.state & BS_ST_INSTANT))
+        if (!(dirty_it->second.state & BS_ST_INSTANT))
         {
             unstable_unsynced++;
         }
@@ -596,11 +598,11 @@ resume_4:
         {
             auto & unstab = unstable_writes[op->oid];
             unstab = unstab < op->version ? op->version : unstab;
-        }
+            if (!is_instant)
-        else if (!is_instant)
+            {
-        {
+                unstable_unsynced--;
-            unstable_unsynced--;
+                assert(unstable_unsynced >= 0);
-            assert(unstable_unsynced >= 0);
+            }
         }
         dirty_it->second.state = (dirty_it->second.state & ~BS_ST_WORKFLOW_MASK)
             | (imm ? BS_ST_SYNCED : BS_ST_WRITTEN);

src/cli.cpp

@@ -116,7 +116,8 @@ static const char* help_text =
     "Use vitastor-cli --help <command> for command details or vitastor-cli --help --all for all details.\n"
     "\n"
     "GLOBAL OPTIONS:\n"
-    "  --etcd_address <etcd_address>\n"
+    "  --config_file FILE  Path to Vitastor configuration file\n"
+    "  --etcd_address URL  Etcd connection address\n"
     "  --iodepth N         Send N operations in parallel to each OSD when possible (default 32)\n"
     "  --parallel_osds M   Work with M osds in parallel when possible (default 4)\n"
     "  --progress 1|0      Report progress (default 1)\n"

src/cluster_client.cpp

@@ -6,7 +6,7 @@
 #include "cluster_client_impl.h"
 #include "http_client.h" // json_is_true
 
-cluster_client_t::cluster_client_t(ring_loop_t *ringloop, timerfd_manager_t *tfd, json11::Json & config)
+cluster_client_t::cluster_client_t(ring_loop_t *ringloop, timerfd_manager_t *tfd, json11::Json config)
 {
     wb = new writeback_cache_t();
 
@@ -359,6 +359,8 @@ void cluster_client_t::on_load_config_hook(json11::Json::object & etcd_global_co
     {
         up_wait_retry_interval = 50;
     }
+    // log_level
+    log_level = config["log_level"].uint64_value();
     msgr.parse_config(config);
     st_cli.parse_config(config);
     st_cli.load_pgs();
@@ -532,7 +534,7 @@ void cluster_client_t::execute_internal(cluster_op_t *op)
         return;
     }
     if (op->opcode == OSD_OP_WRITE && enable_writeback && !(op->flags & OP_FLUSH_BUFFER) &&
-        !op->version /* FIXME no CAS writeback */)
+        !op->version /* no CAS writeback */)
     {
         if (wb->writebacks_active >= client_max_writeback_iodepth)
         {
@@ -553,7 +555,7 @@ void cluster_client_t::execute_internal(cluster_op_t *op)
     }
     if (op->opcode == OSD_OP_WRITE && !(op->flags & OP_IMMEDIATE_COMMIT))
     {
-        if (!(op->flags & OP_FLUSH_BUFFER))
+        if (!(op->flags & OP_FLUSH_BUFFER) && !op->version /* no CAS write-repeat */)
         {
             wb->copy_write(op, CACHE_WRITTEN);
         }
@@ -703,6 +705,8 @@ resume_1:
         }
         goto resume_2;
     }
+    // Protect from try_send completing the operation immediately
+    op->inflight_count++;
     for (int i = 0; i < op->parts.size(); i++)
     {
         if (!(op->parts[i].flags & PART_SENT))
@@ -726,8 +730,10 @@ resume_1:
             }
         }
     }
+    op->inflight_count--;
     if (op->state == 1)
     {
+        // Some suboperations have to be resent
         return 0;
     }
 resume_2:
@@ -1147,12 +1153,15 @@ void cluster_client_t::handle_op_part(cluster_op_part_t *part)
         if (op->retval != -EINTR && op->retval != -EIO && op->retval != -ENOSPC)
         {
             stop_fd = part->op.peer_fd;
-            fprintf(
+            if (op->retval != -EPIPE || log_level > 0)
-                stderr, "%s operation failed on OSD %lu: retval=%ld (expected %d), dropping connection\n",
+            {
-                osd_op_names[part->op.req.hdr.opcode], part->osd_num, part->op.reply.hdr.retval, expected
+                fprintf(
-            );
+                    stderr, "%s operation failed on OSD %lu: retval=%ld (expected %d), dropping connection\n",
+                    osd_op_names[part->op.req.hdr.opcode], part->osd_num, part->op.reply.hdr.retval, expected
+                );
+            }
         }
-        else
+        else if (log_level > 0)
         {
             fprintf(
                 stderr, "%s operation failed on OSD %lu: retval=%ld (expected %d)\n",

src/cluster_client.h

@@ -91,7 +91,7 @@ class cluster_client_t
     uint64_t client_max_buffered_ops = 0;
     uint64_t client_max_writeback_iodepth = 0;
 
-    int log_level;
+    int log_level = 0;
     int up_wait_retry_interval = 500; // ms
 
     int retry_timeout_id = 0;
@@ -121,7 +121,7 @@ public:
     json11::Json::object cli_config, file_config, etcd_global_config;
     json11::Json::object config;
 
-    cluster_client_t(ring_loop_t *ringloop, timerfd_manager_t *tfd, json11::Json & config);
+    cluster_client_t(ring_loop_t *ringloop, timerfd_manager_t *tfd, json11::Json config);
     ~cluster_client_t();
     void execute(cluster_op_t *op);
     void execute_raw(osd_num_t osd_num, osd_op_t *op);

src/disk_tool.cpp

@@ -127,6 +127,10 @@ static const char *help_text =
     "vitastor-disk write-sb <device>\n"
     "  Read JSON from STDIN and write it into Vitastor OSD superblock on <device>.\n"
     "\n"
+    "vitastor-disk update-sb <device> [--force] [--<parameter> <value>] [...]\n"
+    "  Read Vitastor OSD superblock from <device>, update parameters in it and write it back.\n"
+    "  --force allows to ignore validation errors.\n"
+    "\n"
     "vitastor-disk udev <device>\n"
     "  Try to read Vitastor OSD superblock from <device> and print variables for udev.\n"
     "\n"
@@ -363,6 +367,15 @@ int main(int argc, char *argv[])
         }
         return self.write_sb(cmd[1]);
     }
+    else if (!strcmp(cmd[0], "update-sb"))
+    {
+        if (cmd.size() != 2)
+        {
+            fprintf(stderr, "Exactly 1 device path argument is required\n");
+            return 1;
+        }
+        return self.update_sb(cmd[1]);
+    }
     else if (!strcmp(cmd[0], "start") || !strcmp(cmd[0], "stop") ||
         !strcmp(cmd[0], "restart") || !strcmp(cmd[0], "enable") || !strcmp(cmd[0], "disable"))
     {

src/disk_tool.h

@@ -109,6 +109,7 @@ struct disk_tool_t
     int udev_import(std::string device);
     int read_sb(std::string device);
     int write_sb(std::string device);
+    int update_sb(std::string device);
     int exec_osd(std::string device);
     int systemd_start_stop_osds(const std::vector<std::string> & cmd, const std::vector<std::string> & devices);
     int pre_exec_osd(std::string device);

src/disk_tool_prepare.cpp

@@ -440,16 +440,25 @@ std::vector<std::string> disk_tool_t::get_new_data_parts(vitastor_dev_info_t & d
                 {
                     // Use this partition
                     use_parts.push_back(part["uuid"].string_value());
+                    osds_exist++;
                 }
                 else
                 {
+                    std::string part_path = "/dev/disk/by-partuuid/"+strtolower(part["uuid"].string_value());
+                    bool is_meta = sb["params"]["meta_device"].string_value() == part_path;
+                    bool is_journal = sb["params"]["journal_device"].string_value() == part_path;
+                    bool is_data = sb["params"]["data_device"].string_value() == part_path;
                     fprintf(
-                        stderr, "%s is already initialized for OSD %lu, skipping\n",
+                        stderr, "%s is already initialized for OSD %lu%s, skipping\n",
-                        part["node"].string_value().c_str(), sb["params"]["osd_num"].uint64_value()
+                        part["node"].string_value().c_str(), sb["params"]["osd_num"].uint64_value(),
+                        (is_data ? " data" : (is_meta ? " meta" : (is_journal ? " journal" : "")))
                     );
-                    osds_size += part["size"].uint64_value()*dev.pt["sectorsize"].uint64_value();
+                    if (is_data || sb["params"]["data_device"].string_value().substr(0, 22) != "/dev/disk/by-partuuid/")
+                    {
+                        osds_size += part["size"].uint64_value()*dev.pt["sectorsize"].uint64_value();
+                        osds_exist++;
+                    }
                 }
-                osds_exist++;
             }
         }
         // Still create OSD(s) if a disk has no more than (max_other_percent) other data

src/disk_tool_udev.cpp

@@ -86,6 +86,24 @@ int disk_tool_t::write_sb(std::string device)
     return !write_osd_superblock(device, params);
 }
 
+int disk_tool_t::update_sb(std::string device)
+{
+    json11::Json sb = read_osd_superblock(device, true, options.find("force") != options.end());
+    if (sb.is_null())
+    {
+        return 1;
+    }
+    auto sb_obj = sb["params"].object_items();
+    for (auto & kv: options)
+    {
+        if (kv.first != "force")
+        {
+            sb_obj[kv.first] = kv.second;
+        }
+    }
+    return !write_osd_superblock(device, sb_obj);
+}
+
 uint32_t disk_tool_t::write_osd_superblock(std::string device, json11::Json params)
 {
     std::string json_data = params.dump();

src/etcd_state_client.cpp

@@ -135,8 +135,8 @@ void etcd_state_client_t::etcd_call(std::string api, json11::Json payload, int t
             {
                 if (this->log_level > 0)
                 {
-                    printf(
+                    fprintf(
-                        "Warning: etcd request failed: %s, retrying %d more times\n",
+                        stderr, "Warning: etcd request failed: %s, retrying %d more times\n",
                         err.c_str(), retries
                     );
                 }
@@ -333,7 +333,7 @@ void etcd_state_client_t::start_etcd_watcher()
         etcd_watch_ws = NULL;
     }
     if (this->log_level > 1)
-        printf("Trying to connect to etcd websocket at %s\n", etcd_address.c_str());
+        fprintf(stderr, "Trying to connect to etcd websocket at %s, watch from revision %lu\n", etcd_address.c_str(), etcd_watch_revision);
     etcd_watch_ws = open_websocket(tfd, etcd_address, etcd_api_path+"/watch", etcd_slow_timeout,
         [this, cur_addr = selected_etcd_address](const http_response_t *msg)
     {
@@ -356,8 +356,8 @@ void etcd_state_client_t::start_etcd_watcher()
                         watch_id == ETCD_PG_HISTORY_WATCH_ID ||
                         watch_id == ETCD_OSD_STATE_WATCH_ID)
                         etcd_watches_initialised++;
-                    if (etcd_watches_initialised == 4 && this->log_level > 0)
+                    if (etcd_watches_initialised == ETCD_TOTAL_WATCHES && this->log_level > 0)
-                        fprintf(stderr, "Successfully subscribed to etcd at %s\n", cur_addr.c_str());
+                        fprintf(stderr, "Successfully subscribed to etcd at %s, revision %lu\n", cur_addr.c_str(), etcd_watch_revision);
                 }
                 if (data["result"]["canceled"].bool_value())
                 {
@@ -393,9 +393,13 @@ void etcd_state_client_t::start_etcd_watcher()
                         exit(1);
                     }
                 }
-                if (etcd_watches_initialised == 4)
+                if (etcd_watches_initialised == ETCD_TOTAL_WATCHES && !data["result"]["header"]["revision"].is_null())
                 {
-                    etcd_watch_revision = data["result"]["header"]["revision"].uint64_value()+1;
+                    // Protect against a revision beign split into multiple messages and some
+                    // of them being lost. Even though I'm not sure if etcd actually splits them
+                    // Also sometimes etcd sends something without a header, like:
+                    // {"error": {"grpc_code": 14, "http_code": 503, "http_status": "Service Unavailable", "message": "error reading from server: EOF"}}
+                    etcd_watch_revision = data["result"]["header"]["revision"].uint64_value();
                     addresses_to_try.clear();
                 }
                 // First gather all changes into a hash to remove multiple overwrites
@@ -507,7 +511,7 @@ void etcd_state_client_t::start_ws_keepalive()
     {
         ws_keepalive_timer = tfd->set_timer(etcd_ws_keepalive_interval*1000, true, [this](int)
         {
-            if (!etcd_watch_ws)
+            if (!etcd_watch_ws || etcd_watches_initialised < ETCD_TOTAL_WATCHES)
             {
                 // Do nothing
             }
@@ -636,18 +640,28 @@ void etcd_state_client_t::load_pgs()
             on_load_pgs_hook(false);
             return;
         }
+        reset_pg_exists();
         if (!etcd_watch_revision)
         {
             etcd_watch_revision = data["header"]["revision"].uint64_value()+1;
+            if (this->log_level > 3)
+            {
+                fprintf(stderr, "Loaded revision %lu of PG configuration\n", etcd_watch_revision-1);
+            }
         }
         for (auto & res: data["responses"].array_items())
         {
             for (auto & kv_json: res["response_range"]["kvs"].array_items())
             {
                 auto kv = parse_etcd_kv(kv_json);
+                if (this->log_level > 3)
+                {
+                    fprintf(stderr, "Loaded key: %s -> %s\n", kv.key.c_str(), kv.value.dump().c_str());
+                }
                 parse_state(kv);
             }
         }
+        clean_nonexistent_pgs();
         on_load_pgs_hook(true);
         start_etcd_watcher();
     });
@@ -668,6 +682,73 @@ void etcd_state_client_t::load_pgs()
 }
 #endif
 
+void etcd_state_client_t::reset_pg_exists()
+{
+    for (auto & pool_item: pool_config)
+    {
+        for (auto & pg_item: pool_item.second.pg_config)
+        {
+            pg_item.second.state_exists = false;
+            pg_item.second.history_exists = false;
+        }
+    }
+    seen_peers.clear();
+}
+
+void etcd_state_client_t::clean_nonexistent_pgs()
+{
+    for (auto & pool_item: pool_config)
+    {
+        for (auto pg_it = pool_item.second.pg_config.begin(); pg_it != pool_item.second.pg_config.end(); )
+        {
+            auto & pg_cfg = pg_it->second;
+            if (!pg_cfg.config_exists && !pg_cfg.state_exists && !pg_cfg.history_exists)
+            {
+                if (this->log_level > 3)
+                {
+                    fprintf(stderr, "PG %u/%u disappeared after reload, forgetting it\n", pool_item.first, pg_it->first);
+                }
+                pool_item.second.pg_config.erase(pg_it++);
+            }
+            else
+            {
+                if (!pg_cfg.state_exists)
+                {
+                    if (this->log_level > 3)
+                    {
+                        fprintf(stderr, "PG %u/%u primary OSD disappeared after reload, forgetting it\n", pool_item.first, pg_it->first);
+                    }
+                    parse_state((etcd_kv_t){
+                        .key = etcd_prefix+"/pg/state/"+std::to_string(pool_item.first)+"/"+std::to_string(pg_it->first),
+                    });
+                }
+                if (!pg_cfg.history_exists)
+                {
+                    if (this->log_level > 3)
+                    {
+                        fprintf(stderr, "PG %u/%u history disappeared after reload, forgetting it\n", pool_item.first, pg_it->first);
+                    }
+                    parse_state((etcd_kv_t){
+                        .key = etcd_prefix+"/pg/history/"+std::to_string(pool_item.first)+"/"+std::to_string(pg_it->first),
+                    });
+                }
+                pg_it++;
+            }
+        }
+    }
+    for (auto & peer_item: peer_states)
+    {
+        if (seen_peers.find(peer_item.first) == seen_peers.end())
+        {
+            fprintf(stderr, "OSD %lu state disappeared after reload, forgetting it\n", peer_item.first);
+            parse_state((etcd_kv_t){
+                .key = etcd_prefix+"/osd/state/"+std::to_string(peer_item.first),
+            });
+        }
+    }
+    seen_peers.clear();
+}
+
 void etcd_state_client_t::parse_state(const etcd_kv_t & kv)
 {
     const std::string & key = kv.key;
@@ -822,7 +903,7 @@ void etcd_state_client_t::parse_state(const etcd_kv_t & kv)
         {
             for (auto & pg_item: pool_item.second.pg_config)
             {
-                pg_item.second.exists = false;
+                pg_item.second.config_exists = false;
             }
         }
         for (auto & pool_item: value["items"].object_items())
@@ -845,7 +926,7 @@ void etcd_state_client_t::parse_state(const etcd_kv_t & kv)
                     continue;
                 }
                 auto & parsed_cfg = this->pool_config[pool_id].pg_config[pg_num];
-                parsed_cfg.exists = true;
+                parsed_cfg.config_exists = true;
                 parsed_cfg.pause = pg_item.second["pause"].bool_value();
                 parsed_cfg.primary = pg_item.second["primary"].uint64_value();
                 parsed_cfg.target_set.clear();
@@ -866,7 +947,7 @@ void etcd_state_client_t::parse_state(const etcd_kv_t & kv)
             int n = 0;
             for (auto pg_it = pool_item.second.pg_config.begin(); pg_it != pool_item.second.pg_config.end(); pg_it++)
             {
-                if (pg_it->second.exists && pg_it->first != ++n)
+                if (pg_it->second.config_exists && pg_it->first != ++n)
                 {
                     fprintf(
                         stderr, "Invalid pool %u PG configuration: PG numbers don't cover whole 1..%lu range\n",
@@ -874,7 +955,7 @@ void etcd_state_client_t::parse_state(const etcd_kv_t & kv)
                     );
                     for (pg_it = pool_item.second.pg_config.begin(); pg_it != pool_item.second.pg_config.end(); pg_it++)
                     {
-                        pg_it->second.exists = false;
+                        pg_it->second.config_exists = false;
                     }
                     n = 0;
                     break;
@@ -899,6 +980,7 @@ void etcd_state_client_t::parse_state(const etcd_kv_t & kv)
             auto & pg_cfg = this->pool_config[pool_id].pg_config[pg_num];
             pg_cfg.target_history.clear();
             pg_cfg.all_peers.clear();
+            pg_cfg.history_exists = !value.is_null();
             // Refuse to start PG if any set of the <osd_sets> has no live OSDs
             for (auto & hist_item: value["osd_sets"].array_items())
             {
@@ -951,11 +1033,15 @@ void etcd_state_client_t::parse_state(const etcd_kv_t & kv)
         }
         else if (value.is_null())
         {
-            this->pool_config[pool_id].pg_config[pg_num].cur_primary = 0;
+            auto & pg_cfg = this->pool_config[pool_id].pg_config[pg_num];
-            this->pool_config[pool_id].pg_config[pg_num].cur_state = 0;
+            pg_cfg.state_exists = false;
+            pg_cfg.cur_primary = 0;
+            pg_cfg.cur_state = 0;
         }
         else
         {
+            auto & pg_cfg = this->pool_config[pool_id].pg_config[pg_num];
+            pg_cfg.state_exists = true;
             osd_num_t cur_primary = value["primary"].uint64_value();
             int state = 0;
             for (auto & e: value["state"].array_items())
@@ -983,8 +1069,8 @@ void etcd_state_client_t::parse_state(const etcd_kv_t & kv)
                 fprintf(stderr, "Unexpected pool %u PG %u state in etcd: primary=%lu, state=%s\n", pool_id, pg_num, cur_primary, value["state"].dump().c_str());
                 return;
             }
-            this->pool_config[pool_id].pg_config[pg_num].cur_primary = cur_primary;
+            pg_cfg.cur_primary = cur_primary;
-            this->pool_config[pool_id].pg_config[pg_num].cur_state = state;
+            pg_cfg.cur_state = state;
         }
     }
     else if (key.substr(0, etcd_prefix.length()+11) == etcd_prefix+"/osd/state/")
@@ -998,6 +1084,7 @@ void etcd_state_client_t::parse_state(const etcd_kv_t & kv)
                 value["port"].int64_value() > 0 && value["port"].int64_value() < 65536)
             {
                 this->peer_states[peer_osd] = value;
+                this->seen_peers.insert(peer_osd);
             }
             else
             {

src/etcd_state_client.h

@@ -3,6 +3,8 @@
 
 #pragma once
 
+#include <set>
+
 #include "json11/json11.hpp"
 #include "osd_id.h"
 #include "timerfd_manager.h"
@@ -11,6 +13,7 @@
 #define ETCD_PG_STATE_WATCH_ID 2
 #define ETCD_PG_HISTORY_WATCH_ID 3
 #define ETCD_OSD_STATE_WATCH_ID 4
+#define ETCD_TOTAL_WATCHES 4
 
 #define DEFAULT_BLOCK_SIZE 128*1024
 #define MIN_DATA_BLOCK_SIZE 4*1024
@@ -30,7 +33,7 @@ struct etcd_kv_t
 
 struct pg_config_t
 {
-    bool exists;
+    bool config_exists, history_exists, state_exists;
     osd_num_t primary;
     std::vector<osd_num_t> target_set;
     std::vector<std::vector<osd_num_t>> target_history;
@@ -61,21 +64,21 @@ struct pool_config_t
 
 struct inode_config_t
 {
-    uint64_t num;
+    uint64_t num = 0;
     std::string name;
-    uint64_t size;
+    uint64_t size = 0;
-    inode_t parent_id;
+    inode_t parent_id = 0;
-    bool readonly;
+    bool readonly = false;
     // Arbitrary metadata
     json11::Json meta;
     // Change revision of the metadata in etcd
-    uint64_t mod_revision;
+    uint64_t mod_revision = 0;
 };
 
 struct inode_watch_t
 {
     std::string name;
-    inode_config_t cfg;
+    inode_config_t cfg = {};
 };
 
 struct http_co_t;
@@ -113,6 +116,7 @@ public:
     uint64_t etcd_watch_revision = 0;
     std::map<pool_id_t, pool_config_t> pool_config;
     std::map<osd_num_t, json11::Json> peer_states;
+    std::set<osd_num_t> seen_peers;
     std::map<inode_t, inode_config_t> inode_config;
     std::map<std::string, inode_t> inode_by_name;
 
@@ -138,6 +142,8 @@ public:
     void start_ws_keepalive();
     void load_global_config();
     void load_pgs();
+    void reset_pg_exists();
+    void clean_nonexistent_pgs();
     void parse_state(const etcd_kv_t & kv);
     void parse_config(const json11::Json & config);
     void insert_inode_config(const inode_config_t & cfg);

src/kv_cli.cpp

@@ -0,0 +1,401 @@
+// Copyright (c) Vitaliy Filippov, 2019+
+// License: VNPL-1.1 (see README.md for details)
+//
+// Vitastor shared key/value database test CLI
+
+#define _XOPEN_SOURCE
+#include <limits.h>
+
+#include <netinet/tcp.h>
+#include <sys/epoll.h>
+#include <unistd.h>
+#include <fcntl.h>
+//#include <signal.h>
+
+#include "epoll_manager.h"
+#include "str_util.h"
+#include "kv_db.h"
+
+const char *exe_name = NULL;
+
+class kv_cli_t
+{
+public:
+    kv_dbw_t *db = NULL;
+    ring_loop_t *ringloop = NULL;
+    epoll_manager_t *epmgr = NULL;
+    cluster_client_t *cli = NULL;
+    bool interactive = false;
+    int in_progress = 0;
+    char *cur_cmd = NULL;
+    int cur_cmd_size = 0, cur_cmd_alloc = 0;
+    bool finished = false, eof = false;
+    json11::Json::object cfg;
+
+    ~kv_cli_t();
+
+    static json11::Json::object parse_args(int narg, const char *args[]);
+    void run(const json11::Json::object & cfg);
+    void read_cmd();
+    void next_cmd();
+    void handle_cmd(const std::string & cmd, std::function<void()> cb);
+};
+
+kv_cli_t::~kv_cli_t()
+{
+    if (cur_cmd)
+    {
+        free(cur_cmd);
+        cur_cmd = NULL;
+    }
+    cur_cmd_alloc = 0;
+    if (db)
+        delete db;
+    if (cli)
+    {
+        cli->flush();
+        delete cli;
+    }
+    if (epmgr)
+        delete epmgr;
+    if (ringloop)
+        delete ringloop;
+}
+
+json11::Json::object kv_cli_t::parse_args(int narg, const char *args[])
+{
+    json11::Json::object cfg;
+    for (int i = 1; i < narg; i++)
+    {
+        if (!strcmp(args[i], "-h") || !strcmp(args[i], "--help"))
+        {
+            printf(
+                "Vitastor Key/Value CLI\n"
+                "(c) Vitaliy Filippov, 2023+ (VNPL-1.1)\n"
+                "\n"
+                "USAGE: %s [--etcd_address ADDR] [OTHER OPTIONS]\n",
+                exe_name
+            );
+            exit(0);
+        }
+        else if (args[i][0] == '-' && args[i][1] == '-')
+        {
+            const char *opt = args[i]+2;
+            cfg[opt] = !strcmp(opt, "json") || i == narg-1 ? "1" : args[++i];
+        }
+    }
+    return cfg;
+}
+
+void kv_cli_t::run(const json11::Json::object & cfg)
+{
+    // Create client
+    ringloop = new ring_loop_t(512);
+    epmgr = new epoll_manager_t(ringloop);
+    cli = new cluster_client_t(ringloop, epmgr->tfd, cfg);
+    db = new kv_dbw_t(cli);
+    // Load image metadata
+    while (!cli->is_ready())
+    {
+        ringloop->loop();
+        if (cli->is_ready())
+            break;
+        ringloop->wait();
+    }
+    // Run
+    fcntl(0, F_SETFL, fcntl(0, F_GETFL, 0) | O_NONBLOCK);
+    try
+    {
+        epmgr->tfd->set_fd_handler(0, false, [this](int fd, int events)
+        {
+            if (events & EPOLLIN)
+            {
+                read_cmd();
+            }
+            if (events & EPOLLRDHUP)
+            {
+                epmgr->tfd->set_fd_handler(0, false, NULL);
+                finished = true;
+            }
+        });
+        interactive = true;
+        printf("> ");
+    }
+    catch (std::exception & e)
+    {
+        // Can't add to epoll, STDIN is probably a file
+        read_cmd();
+    }
+    while (!finished)
+    {
+        ringloop->loop();
+        if (!finished)
+            ringloop->wait();
+    }
+    // Destroy the client
+    delete db;
+    db = NULL;
+    cli->flush();
+    delete cli;
+    delete epmgr;
+    delete ringloop;
+    cli = NULL;
+    epmgr = NULL;
+    ringloop = NULL;
+}
+
+void kv_cli_t::read_cmd()
+{
+    if (!cur_cmd_alloc)
+    {
+        cur_cmd_alloc = 65536;
+        cur_cmd = (char*)malloc_or_die(cur_cmd_alloc);
+    }
+    while (cur_cmd_size < cur_cmd_alloc)
+    {
+        int r = read(0, cur_cmd+cur_cmd_size, cur_cmd_alloc-cur_cmd_size);
+        if (r < 0 && errno != EAGAIN)
+            fprintf(stderr, "Error reading from stdin: %s\n", strerror(errno));
+        if (r > 0)
+            cur_cmd_size += r;
+        if (r == 0)
+            eof = true;
+        if (r <= 0)
+            break;
+    }
+    next_cmd();
+}
+
+void kv_cli_t::next_cmd()
+{
+    if (in_progress > 0)
+    {
+        return;
+    }
+    int pos = 0;
+    for (; pos < cur_cmd_size; pos++)
+    {
+        if (cur_cmd[pos] == '\n' || cur_cmd[pos] == '\r')
+        {
+            auto cmd = trim(std::string(cur_cmd, pos));
+            pos++;
+            memmove(cur_cmd, cur_cmd+pos, cur_cmd_size-pos);
+            cur_cmd_size -= pos;
+            in_progress++;
+            handle_cmd(cmd, [this]()
+            {
+                in_progress--;
+                if (interactive)
+                    printf("> ");
+                next_cmd();
+                if (!in_progress)
+                    read_cmd();
+            });
+            break;
+        }
+    }
+    if (eof && !in_progress)
+    {
+        finished = true;
+    }
+}
+
+void kv_cli_t::handle_cmd(const std::string & cmd, std::function<void()> cb)
+{
+    if (cmd == "")
+    {
+        cb();
+        return;
+    }
+    auto pos = cmd.find_first_of(" \t");
+    if (pos != std::string::npos)
+    {
+        while (pos < cmd.size()-1 && (cmd[pos+1] == ' ' || cmd[pos+1] == '\t'))
+            pos++;
+    }
+    auto opname = strtolower(pos == std::string::npos ? cmd : cmd.substr(0, pos));
+    if (opname == "open")
+    {
+        uint64_t pool_id = 0;
+        inode_t inode_id = 0;
+        uint32_t kv_block_size = 0;
+        int scanned = sscanf(cmd.c_str() + pos+1, "%lu %lu %u", &pool_id, &inode_id, &kv_block_size);
+        if (scanned == 2)
+        {
+            kv_block_size = 4096;
+        }
+        if (scanned < 2 || !pool_id || !inode_id || !kv_block_size || (kv_block_size & (kv_block_size-1)) != 0)
+        {
+            fprintf(stderr, "Usage: open <pool_id> <inode_id> [block_size]. Block size must be a power of 2. Default is 4096.\n");
+            cb();
+            return;
+        }
+        cfg["kv_block_size"] = (uint64_t)kv_block_size;
+        db->open(INODE_WITH_POOL(pool_id, inode_id), cfg, [=](int res)
+        {
+            if (res < 0)
+                fprintf(stderr, "Error opening index: %s (code %d)\n", strerror(-res), res);
+            else
+                printf("Index opened. Current size: %lu bytes\n", db->get_size());
+            cb();
+        });
+    }
+    else if (opname == "config")
+    {
+        auto pos2 = cmd.find_first_of(" \t", pos+1);
+        if (pos2 == std::string::npos)
+        {
+            fprintf(stderr, "Usage: config <property> <value>\n");
+            cb();
+            return;
+        }
+        auto key = trim(cmd.substr(pos+1, pos2-pos-1));
+        auto value = parse_size(trim(cmd.substr(pos2+1)));
+        if (key != "kv_memory_limit" &&
+            key != "kv_allocate_blocks" &&
+            key != "kv_evict_max_misses" &&
+            key != "kv_evict_attempts_per_level" &&
+            key != "kv_evict_unused_age" &&
+            key != "kv_log_level")
+        {
+            fprintf(
+                stderr, "Allowed properties: kv_memory_limit, kv_allocate_blocks,"
+                " kv_evict_max_misses, kv_evict_attempts_per_level, kv_evict_unused_age, kv_log_level\n"
+            );
+        }
+        else
+        {
+            cfg[key] = value;
+            db->set_config(cfg);
+        }
+        cb();
+    }
+    else if (opname == "get" || opname == "set" || opname == "del")
+    {
+        if (opname == "get" || opname == "del")
+        {
+            if (pos == std::string::npos)
+            {
+                fprintf(stderr, "Usage: %s <key>\n", opname.c_str());
+                cb();
+                return;
+            }
+            auto key = trim(cmd.substr(pos+1));
+            if (opname == "get")
+            {
+                db->get(key, [this, cb](int res, const std::string & value)
+                {
+                    if (res < 0)
+                        fprintf(stderr, "Error: %s (code %d)\n", strerror(-res), res);
+                    else
+                    {
+                        write(1, value.c_str(), value.size());
+                        write(1, "\n", 1);
+                    }
+                    cb();
+                });
+            }
+            else
+            {
+                db->del(key, [this, cb](int res)
+                {
+                    if (res < 0)
+                        fprintf(stderr, "Error: %s (code %d)\n", strerror(-res), res);
+                    else
+                        printf("OK\n");
+                    cb();
+                });
+            }
+        }
+        else
+        {
+            auto pos2 = cmd.find_first_of(" \t", pos+1);
+            if (pos2 == std::string::npos)
+            {
+                fprintf(stderr, "Usage: set <key> <value>\n");
+                cb();
+                return;
+            }
+            auto key = trim(cmd.substr(pos+1, pos2-pos-1));
+            auto value = trim(cmd.substr(pos2+1));
+            db->set(key, value, [this, cb](int res)
+            {
+                if (res < 0)
+                    fprintf(stderr, "Error: %s (code %d)\n", strerror(-res), res);
+                else
+                    printf("OK\n");
+                cb();
+            });
+        }
+    }
+    else if (opname == "list")
+    {
+        std::string start, end;
+        if (pos != std::string::npos)
+        {
+            auto pos2 = cmd.find_first_of(" \t", pos+1);
+            if (pos2 != std::string::npos)
+            {
+                start = trim(cmd.substr(pos+1, pos2-pos-1));
+                end = trim(cmd.substr(pos2+1));
+            }
+            else
+            {
+                start = trim(cmd.substr(pos+1));
+            }
+        }
+        void *handle = db->list_start(start);
+        db->list_next(handle, [=](int res, const std::string & key, const std::string & value)
+        {
+            if (res < 0)
+            {
+                if (res != -ENOENT)
+                {
+                    fprintf(stderr, "Error: %s (code %d)\n", strerror(-res), res);
+                }
+                db->list_close(handle);
+                cb();
+            }
+            else
+            {
+                printf("%s = %s\n", key.c_str(), value.c_str());
+                db->list_next(handle, NULL);
+            }
+        });
+    }
+    else if (opname == "close")
+    {
+        db->close([=]()
+        {
+            printf("Index closed\n");
+            cb();
+        });
+    }
+    else if (opname == "quit" || opname == "q")
+    {
+        ::close(0);
+        finished = true;
+    }
+    else
+    {
+        fprintf(
+            stderr, "Unknown operation: %s. Supported operations:\n"
+            "open <pool_id> <inode_id> [block_size]\n"
+            "config <property> <value>\n"
+            "get <key>\nset <key> <value>\ndel <key>\nlist [<start> [end]]\n"
+            "close\nquit\n", opname.c_str()
+        );
+        cb();
+    }
+}
+
+int main(int narg, const char *args[])
+{
+    setvbuf(stdout, NULL, _IONBF, 0);
+    setvbuf(stderr, NULL, _IONBF, 0);
+    exe_name = args[0];
+    kv_cli_t *p = new kv_cli_t();
+    p->run(kv_cli_t::parse_args(narg, args));
+    delete p;
+    return 0;
+}

src/kv_db.h

@@ -0,0 +1,36 @@
+// Copyright (c) Vitaliy Filippov, 2019+
+// License: VNPL-1.1 (see README.md for details)
+//
+// Vitastor shared key/value database
+// Parallel optimistic B-Tree O:-)
+
+#pragma once
+
+#include "cluster_client.h"
+
+struct kv_db_t;
+
+struct kv_dbw_t
+{
+    kv_dbw_t(cluster_client_t *cli);
+    ~kv_dbw_t();
+
+    void open(inode_t inode_id, json11::Json cfg, std::function<void(int)> cb);
+    void set_config(json11::Json cfg);
+    void close(std::function<void()> cb);
+
+    uint64_t get_size();
+
+    void get(const std::string & key, std::function<void(int res, const std::string & value)> cb,
+        bool allow_old_cached = false);
+    void set(const std::string & key, const std::string & value, std::function<void(int res)> cb,
+        std::function<bool(int res, const std::string & value)> cas_compare = NULL);
+    void del(const std::string & key, std::function<void(int res)> cb,
+        std::function<bool(int res, const std::string & value)> cas_compare = NULL);
+
+    void* list_start(const std::string & start);
+    void list_next(void *handle, std::function<void(int res, const std::string & key, const std::string & value)> cb);
+    void list_close(void *handle);
+
+    kv_db_t *db;
+};

src/kv_stress.cpp

@@ -0,0 +1,697 @@
+// Copyright (c) Vitaliy Filippov, 2019+
+// License: VNPL-1.1 (see README.md for details)
+//
+// Vitastor shared key/value database stress tester / benchmark
+
+#define _XOPEN_SOURCE
+#include <limits.h>
+
+#include <netinet/tcp.h>
+#include <sys/epoll.h>
+#include <unistd.h>
+#include <fcntl.h>
+//#include <signal.h>
+
+#include "epoll_manager.h"
+#include "str_util.h"
+#include "kv_db.h"
+
+const char *exe_name = NULL;
+
+struct kv_test_listing_t
+{
+    uint64_t count = 0, done = 0;
+    void *handle = NULL;
+    std::string next_after;
+    std::set<std::string> inflights;
+    timespec tv_begin;
+    bool error = false;
+};
+
+struct kv_test_lat_t
+{
+    const char *name = NULL;
+    uint64_t usec = 0, count = 0;
+};
+
+struct kv_test_stat_t
+{
+    kv_test_lat_t get, add, update, del, list;
+    uint64_t list_keys = 0;
+};
+
+class kv_test_t
+{
+public:
+    // Config
+    json11::Json::object kv_cfg;
+    std::string key_prefix, key_suffix;
+    uint64_t inode_id = 0;
+    uint64_t op_count = 1000000;
+    uint64_t runtime_sec = 0;
+    uint64_t parallelism = 4;
+    uint64_t reopen_prob = 1;
+    uint64_t get_prob = 30000;
+    uint64_t add_prob = 20000;
+    uint64_t update_prob = 20000;
+    uint64_t del_prob = 5000;
+    uint64_t list_prob = 300;
+    uint64_t min_key_len = 10;
+    uint64_t max_key_len = 70;
+    uint64_t min_value_len = 50;
+    uint64_t max_value_len = 300;
+    uint64_t min_list_count = 10;
+    uint64_t max_list_count = 1000;
+    uint64_t print_stats_interval = 1;
+    bool json_output = false;
+    uint64_t log_level = 1;
+    bool trace = false;
+    bool stop_on_error = false;
+    // FIXME: Multiple clients
+    kv_test_stat_t stat, prev_stat;
+    timespec prev_stat_time, start_stat_time;
+
+    // State
+    kv_dbw_t *db = NULL;
+    ring_loop_t *ringloop = NULL;
+    epoll_manager_t *epmgr = NULL;
+    cluster_client_t *cli = NULL;
+    ring_consumer_t consumer;
+    bool finished = false;
+    uint64_t total_prob = 0;
+    uint64_t ops_sent = 0, ops_done = 0;
+    int stat_timer_id = -1;
+    int in_progress = 0;
+    bool reopening = false;
+    std::set<kv_test_listing_t*> listings;
+    std::set<std::string> changing_keys;
+    std::map<std::string, std::string> values;
+
+    ~kv_test_t();
+
+    static json11::Json::object parse_args(int narg, const char *args[]);
+    void parse_config(json11::Json cfg);
+    void run(json11::Json cfg);
+    void loop();
+    void print_stats(kv_test_stat_t & prev_stat, timespec & prev_stat_time);
+    void print_total_stats();
+    void start_change(const std::string & key);
+    void stop_change(const std::string & key);
+    void add_stat(kv_test_lat_t & stat, timespec tv_begin);
+};
+
+kv_test_t::~kv_test_t()
+{
+    if (db)
+        delete db;
+    if (cli)
+    {
+        cli->flush();
+        delete cli;
+    }
+    if (epmgr)
+        delete epmgr;
+    if (ringloop)
+        delete ringloop;
+}
+
+json11::Json::object kv_test_t::parse_args(int narg, const char *args[])
+{
+    json11::Json::object cfg;
+    for (int i = 1; i < narg; i++)
+    {
+        if (!strcmp(args[i], "-h") || !strcmp(args[i], "--help"))
+        {
+            printf(
+                "Vitastor Key/Value DB stress tester / benchmark\n"
+                "(c) Vitaliy Filippov, 2023+ (VNPL-1.1)\n"
+                "\n"
+                "USAGE: %s --pool_id POOL_ID --inode_id INODE_ID [OPTIONS]\n"
+                "  --op_count 1000000\n"
+                "    Total operations to run during test. 0 means unlimited\n"
+                "  --key_prefix \"\"\n"
+                "    Prefix for all keys read or written (to avoid collisions)\n"
+                "  --key_suffix \"\"\n"
+                "    Suffix for all keys read or written (to avoid collisions, but scan all DB)\n"
+                "  --runtime 0\n"
+                "    Run for this number of seconds. 0 means unlimited\n"
+                "  --parallelism 4\n"
+                "    Run this number of operations in parallel\n"
+                "  --get_prob 30000\n"
+                "    Fraction of key retrieve operations\n"
+                "  --add_prob 20000\n"
+                "    Fraction of key addition operations\n"
+                "  --update_prob 20000\n"
+                "    Fraction of key update operations\n"
+                "  --del_prob 30000\n"
+                "    Fraction of key delete operations\n"
+                "  --list_prob 300\n"
+                "    Fraction of listing operations\n"
+                "  --min_key_len 10\n"
+                "    Minimum key size in bytes\n"
+                "  --max_key_len 70\n"
+                "    Maximum key size in bytes\n"
+                "  --min_value_len 50\n"
+                "    Minimum value size in bytes\n"
+                "  --max_value_len 300\n"
+                "    Maximum value size in bytes\n"
+                "  --min_list_count 10\n"
+                "    Minimum number of keys read in listing (0 = all keys)\n"
+                "  --max_list_count 1000\n"
+                "    Maximum number of keys read in listing\n"
+                "  --print_stats 1\n"
+                "    Print operation statistics every this number of seconds\n"
+                "  --json\n"
+                "    JSON output\n"
+                "  --stop_on_error 0\n"
+                "    Stop on first execution error, mismatch, lost key or extra key during listing\n"
+                "  --kv_memory_limit 128M\n"
+                "    Maximum memory to use for vitastor-kv index cache\n"
+                "  --kv_allocate_blocks 4\n"
+                "    Number of PG blocks used for new tree block allocation in parallel\n"
+                "  --kv_evict_max_misses 10\n"
+                "    Eviction algorithm parameter: retry eviction from another random spot\n"
+                "    if this number of keys is used currently or was used recently\n"
+                "  --kv_evict_attempts_per_level 3\n"
+                "    Retry eviction at most this number of times per tree level, starting\n"
+                "    with bottom-most levels\n"
+                "  --kv_evict_unused_age 1000\n"
+                "    Evict only keys unused during this number of last operations\n"
+                "  --kv_log_level 1\n"
+                "    Log level. 0 = errors, 1 = warnings, 10 = trace operations\n",
+                exe_name
+            );
+            exit(0);
+        }
+        else if (args[i][0] == '-' && args[i][1] == '-')
+        {
+            const char *opt = args[i]+2;
+            cfg[opt] = !strcmp(opt, "json") || i == narg-1 ? "1" : args[++i];
+        }
+    }
+    return cfg;
+}
+
+void kv_test_t::parse_config(json11::Json cfg)
+{
+    inode_id = INODE_WITH_POOL(cfg["pool_id"].uint64_value(), cfg["inode_id"].uint64_value());
+    if (cfg["op_count"].uint64_value() > 0)
+        op_count = cfg["op_count"].uint64_value();
+    key_prefix = cfg["key_prefix"].string_value();
+    key_suffix = cfg["key_suffix"].string_value();
+    if (cfg["runtime"].uint64_value() > 0)
+        runtime_sec = cfg["runtime"].uint64_value();
+    if (cfg["parallelism"].uint64_value() > 0)
+        parallelism = cfg["parallelism"].uint64_value();
+    if (!cfg["reopen_prob"].is_null())
+        reopen_prob = cfg["reopen_prob"].uint64_value();
+    if (!cfg["get_prob"].is_null())
+        get_prob = cfg["get_prob"].uint64_value();
+    if (!cfg["add_prob"].is_null())
+        add_prob = cfg["add_prob"].uint64_value();
+    if (!cfg["update_prob"].is_null())
+        update_prob = cfg["update_prob"].uint64_value();
+    if (!cfg["del_prob"].is_null())
+        del_prob = cfg["del_prob"].uint64_value();
+    if (!cfg["list_prob"].is_null())
+        list_prob = cfg["list_prob"].uint64_value();
+    if (!cfg["min_key_len"].is_null())
+        min_key_len = cfg["min_key_len"].uint64_value();
+    if (cfg["max_key_len"].uint64_value() > 0)
+        max_key_len = cfg["max_key_len"].uint64_value();
+    if (!cfg["min_value_len"].is_null())
+        min_value_len = cfg["min_value_len"].uint64_value();
+    if (cfg["max_value_len"].uint64_value() > 0)
+        max_value_len = cfg["max_value_len"].uint64_value();
+    if (!cfg["min_list_count"].is_null())
+        min_list_count = cfg["min_list_count"].uint64_value();
+    if (!cfg["max_list_count"].is_null())
+        max_list_count = cfg["max_list_count"].uint64_value();
+    if (!cfg["print_stats"].is_null())
+        print_stats_interval = cfg["print_stats"].uint64_value();
+    if (!cfg["json"].is_null())
+        json_output = true;
+    if (!cfg["stop_on_error"].is_null())
+        stop_on_error = cfg["stop_on_error"].bool_value();
+    if (!cfg["kv_memory_limit"].is_null())
+        kv_cfg["kv_memory_limit"] = cfg["kv_memory_limit"];
+    if (!cfg["kv_allocate_blocks"].is_null())
+        kv_cfg["kv_allocate_blocks"] = cfg["kv_allocate_blocks"];
+    if (!cfg["kv_evict_max_misses"].is_null())
+        kv_cfg["kv_evict_max_misses"] = cfg["kv_evict_max_misses"];
+    if (!cfg["kv_evict_attempts_per_level"].is_null())
+        kv_cfg["kv_evict_attempts_per_level"] = cfg["kv_evict_attempts_per_level"];
+    if (!cfg["kv_evict_unused_age"].is_null())
+        kv_cfg["kv_evict_unused_age"] = cfg["kv_evict_unused_age"];
+    if (!cfg["kv_log_level"].is_null())
+    {
+        log_level = cfg["kv_log_level"].uint64_value();
+        trace = log_level >= 10;
+        kv_cfg["kv_log_level"] = cfg["kv_log_level"];
+    }
+    total_prob = reopen_prob+get_prob+add_prob+update_prob+del_prob+list_prob;
+    stat.get.name = "get";
+    stat.add.name = "add";
+    stat.update.name = "update";
+    stat.del.name = "del";
+    stat.list.name = "list";
+}
+
+void kv_test_t::run(json11::Json cfg)
+{
+    srand48(time(NULL));
+    parse_config(cfg);
+    // Create client
+    ringloop = new ring_loop_t(512);
+    epmgr = new epoll_manager_t(ringloop);
+    cli = new cluster_client_t(ringloop, epmgr->tfd, cfg);
+    db = new kv_dbw_t(cli);
+    // Load image metadata
+    while (!cli->is_ready())
+    {
+        ringloop->loop();
+        if (cli->is_ready())
+            break;
+        ringloop->wait();
+    }
+    // Run
+    reopening = true;
+    db->open(inode_id, kv_cfg, [this](int res)
+    {
+        reopening = false;
+        if (res < 0)
+        {
+            fprintf(stderr, "ERROR: Open index: %d (%s)\n", res, strerror(-res));
+            exit(1);
+        }
+        if (trace)
+            printf("Index opened\n");
+        ringloop->wakeup();
+    });
+    consumer.loop = [this]() { loop(); };
+    ringloop->register_consumer(&consumer);
+    if (print_stats_interval)
+        stat_timer_id = epmgr->tfd->set_timer(print_stats_interval*1000, true, [this](int) { print_stats(prev_stat, prev_stat_time); });
+    clock_gettime(CLOCK_REALTIME, &start_stat_time);
+    prev_stat_time = start_stat_time;
+    while (!finished)
+    {
+        ringloop->loop();
+        if (!finished)
+            ringloop->wait();
+    }
+    if (stat_timer_id >= 0)
+        epmgr->tfd->clear_timer(stat_timer_id);
+    ringloop->unregister_consumer(&consumer);
+    // Print total stats
+    print_total_stats();
+    // Destroy the client
+    delete db;
+    db = NULL;
+    cli->flush();
+    delete cli;
+    delete epmgr;
+    delete ringloop;
+    cli = NULL;
+    epmgr = NULL;
+    ringloop = NULL;
+}
+
+static const char *base64_chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789@+/";
+
+std::string random_str(int len)
+{
+    std::string str;
+    str.resize(len);
+    for (int i = 0; i < len; i++)
+    {
+        str[i] = base64_chars[lrand48() % 64];
+    }
+    return str;
+}
+
+void kv_test_t::loop()
+{
+    if (reopening)
+    {
+        return;
+    }
+    if (ops_done >= op_count)
+    {
+        finished = true;
+    }
+    while (!finished && ops_sent < op_count && in_progress < parallelism)
+    {
+        uint64_t dice = (lrand48() % total_prob);
+        if (dice < reopen_prob)
+        {
+            reopening = true;
+            db->close([this]()
+            {
+                if (trace)
+                    printf("Index closed\n");
+                db->open(inode_id, kv_cfg, [this](int res)
+                {
+                    reopening = false;
+                    if (res < 0)
+                    {
+                        fprintf(stderr, "ERROR: Reopen index: %d (%s)\n", res, strerror(-res));
+                        finished = true;
+                        return;
+                    }
+                    if (trace)
+                        printf("Index reopened\n");
+                    ringloop->wakeup();
+                });
+            });
+            return;
+        }
+        else if (dice < reopen_prob+get_prob)
+        {
+            // get existing
+            auto key = random_str(max_key_len);
+            auto k_it = values.lower_bound(key);
+            if (k_it == values.end())
+                continue;
+            key = k_it->first;
+            if (changing_keys.find(key) != changing_keys.end())
+                continue;
+            in_progress++;
+            ops_sent++;
+            if (trace)
+                printf("get %s\n", key.c_str());
+            timespec tv_begin;
+            clock_gettime(CLOCK_REALTIME, &tv_begin);
+            db->get(key, [this, key, tv_begin](int res, const std::string & value)
+            {
+                add_stat(stat.get, tv_begin);
+                ops_done++;
+                in_progress--;
+                auto it = values.find(key);
+                if (res != (it == values.end() ? -ENOENT : 0))
+                {
+                    fprintf(stderr, "ERROR: get %s: %d (%s)\n", key.c_str(), res, strerror(-res));
+                    if (stop_on_error)
+                        exit(1);
+                }
+                else if (it != values.end() && value != it->second)
+                {
+                    fprintf(stderr, "ERROR: get %s: mismatch: %s vs %s\n", key.c_str(), value.c_str(), it->second.c_str());
+                    if (stop_on_error)
+                        exit(1);
+                }
+                ringloop->wakeup();
+            });
+        }
+        else if (dice < reopen_prob+get_prob+add_prob+update_prob)
+        {
+            bool is_add = false;
+            std::string key;
+            if (dice < reopen_prob+get_prob+add_prob)
+            {
+                // add
+                is_add = true;
+                uint64_t key_len = min_key_len + (max_key_len > min_key_len ? lrand48() % (max_key_len-min_key_len) : 0);
+                key = key_prefix + random_str(key_len) + key_suffix;
+            }
+            else
+            {
+                // update
+                key = random_str(max_key_len);
+                auto k_it = values.lower_bound(key);
+                if (k_it == values.end())
+                    continue;
+                key = k_it->first;
+            }
+            if (changing_keys.find(key) != changing_keys.end())
+                continue;
+            uint64_t value_len = min_value_len + (max_value_len > min_value_len ? lrand48() % (max_value_len-min_value_len) : 0);
+            auto value = random_str(value_len);
+            start_change(key);
+            ops_sent++;
+            in_progress++;
+            if (trace)
+                printf("set %s = %s\n", key.c_str(), value.c_str());
+            timespec tv_begin;
+            clock_gettime(CLOCK_REALTIME, &tv_begin);
+            db->set(key, value, [this, key, value, tv_begin, is_add](int res)
+            {
+                add_stat(is_add ? stat.add : stat.update, tv_begin);
+                stop_change(key);
+                ops_done++;
+                in_progress--;
+                if (res != 0)
+                {
+                    fprintf(stderr, "ERROR: set %s = %s: %d (%s)\n", key.c_str(), value.c_str(), res, strerror(-res));
+                    if (stop_on_error)
+                        exit(1);
+                }
+                else
+                {
+                    values[key] = value;
+                }
+                ringloop->wakeup();
+            }, NULL);
+        }
+        else if (dice < reopen_prob+get_prob+add_prob+update_prob+del_prob)
+        {
+            // delete
+            auto key = random_str(max_key_len);
+            auto k_it = values.lower_bound(key);
+            if (k_it == values.end())
+                continue;
+            key = k_it->first;
+            if (changing_keys.find(key) != changing_keys.end())
+                continue;
+            start_change(key);
+            ops_sent++;
+            in_progress++;
+            if (trace)
+                printf("del %s\n", key.c_str());
+            timespec tv_begin;
+            clock_gettime(CLOCK_REALTIME, &tv_begin);
+            db->del(key, [this, key, tv_begin](int res)
+            {
+                add_stat(stat.del, tv_begin);
+                stop_change(key);
+                ops_done++;
+                in_progress--;
+                if (res != 0)
+                {
+                    fprintf(stderr, "ERROR: del %s: %d (%s)\n", key.c_str(), res, strerror(-res));
+                    if (stop_on_error)
+                        exit(1);
+                }
+                else
+                {
+                    values.erase(key);
+                }
+                ringloop->wakeup();
+            }, NULL);
+        }
+        else if (dice < reopen_prob+get_prob+add_prob+update_prob+del_prob+list_prob)
+        {
+            // list
+            ops_sent++;
+            in_progress++;
+            auto key = random_str(max_key_len);
+            auto lst = new kv_test_listing_t;
+            auto k_it = values.lower_bound(key);
+            lst->count = min_list_count + (max_list_count > min_list_count ? lrand48() % (max_list_count-min_list_count) : 0);
+            lst->handle = db->list_start(k_it == values.begin() ? key_prefix : key);
+            lst->next_after = k_it == values.begin() ? key_prefix : key;
+            lst->inflights = changing_keys;
+            listings.insert(lst);
+            if (trace)
+                printf("list from %s\n", key.c_str());
+            clock_gettime(CLOCK_REALTIME, &lst->tv_begin);
+            db->list_next(lst->handle, [this, lst](int res, const std::string & key, const std::string & value)
+            {
+                if (log_level >= 11)
+                    printf("list: %s = %s\n", key.c_str(), value.c_str());
+                if (res >= 0 && key_prefix.size() && (key.size() < key_prefix.size() ||
+                    key.substr(0, key_prefix.size()) != key_prefix))
+                {
+                    // stop at this key
+                    res = -ENOENT;
+                }
+                if (res < 0 || (lst->count > 0 && lst->done >= lst->count))
+                {
+                    add_stat(stat.list, lst->tv_begin);
+                    if (res == 0)
+                    {
+                        // ok (done >= count)
+                    }
+                    else if (res != -ENOENT)
+                    {
+                        fprintf(stderr, "ERROR: list: %d (%s)\n", res, strerror(-res));
+                        lst->error = true;
+                    }
+                    else
+                    {
+                        auto k_it = lst->next_after == "" ? values.begin() : values.upper_bound(lst->next_after);
+                        while (k_it != values.end())
+                        {
+                            while (k_it != values.end() && lst->inflights.find(k_it->first) != lst->inflights.end())
+                                k_it++;
+                            if (k_it != values.end())
+                            {
+                                fprintf(stderr, "ERROR: list: missing key %s\n", (k_it++)->first.c_str());
+                                lst->error = true;
+                            }
+                        }
+                    }
+                    if (lst->error && stop_on_error)
+                        exit(1);
+                    ops_done++;
+                    in_progress--;
+                    db->list_close(lst->handle);
+                    delete lst;
+                    listings.erase(lst);
+                    ringloop->wakeup();
+                }
+                else
+                {
+                    stat.list_keys++;
+                    // Do not check modified keys in listing
+                    // Listing may return their old or new state
+                    if ((!key_suffix.size() || key.size() >= key_suffix.size() &&
+                        key.substr(key.size()-key_suffix.size()) == key_suffix) &&
+                        lst->inflights.find(key) == lst->inflights.end())
+                    {
+                        lst->done++;
+                        auto k_it = lst->next_after == "" ? values.begin() : values.upper_bound(lst->next_after);
+                        while (true)
+                        {
+                            while (k_it != values.end() && lst->inflights.find(k_it->first) != lst->inflights.end())
+                            {
+                                k_it++;
+                            }
+                            if (k_it == values.end() || k_it->first > key)
+                            {
+                                fprintf(stderr, "ERROR: list: extra key %s\n", key.c_str());
+                                lst->error = true;
+                                break;
+                            }
+                            else if (k_it->first < key)
+                            {
+                                fprintf(stderr, "ERROR: list: missing key %s\n", k_it->first.c_str());
+                                lst->error = true;
+                                lst->next_after = k_it->first;
+                                k_it++;
+                            }
+                            else
+                            {
+                                if (k_it->second != value)
+                                {
+                                    fprintf(stderr, "ERROR: list: mismatch: %s = %s but should be %s\n",
+                                        key.c_str(), value.c_str(), k_it->second.c_str());
+                                    lst->error = true;
+                                }
+                                lst->next_after = k_it->first;
+                                break;
+                            }
+                        }
+                    }
+                    db->list_next(lst->handle, NULL);
+                }
+            });
+        }
+    }
+}
+
+void kv_test_t::add_stat(kv_test_lat_t & stat, timespec tv_begin)
+{
+    timespec tv_end;
+    clock_gettime(CLOCK_REALTIME, &tv_end);
+    int64_t usec = (tv_end.tv_sec - tv_begin.tv_sec)*1000000 +
+        (tv_end.tv_nsec - tv_begin.tv_nsec)/1000;
+    if (usec > 0)
+    {
+        stat.usec += usec;
+        stat.count++;
+    }
+}
+
+void kv_test_t::print_stats(kv_test_stat_t & prev_stat, timespec & prev_stat_time)
+{
+    timespec cur_stat_time;
+    clock_gettime(CLOCK_REALTIME, &cur_stat_time);
+    int64_t usec = (cur_stat_time.tv_sec - prev_stat_time.tv_sec)*1000000 +
+        (cur_stat_time.tv_nsec - prev_stat_time.tv_nsec)/1000;
+    if (usec > 0)
+    {
+        kv_test_lat_t *lats[] = { &stat.get, &stat.add, &stat.update, &stat.del, &stat.list };
+        kv_test_lat_t *prev[] = { &prev_stat.get, &prev_stat.add, &prev_stat.update, &prev_stat.del, &prev_stat.list };
+        if (!json_output)
+        {
+            char buf[128] = { 0 };
+            for (int i = 0; i < sizeof(lats)/sizeof(lats[0]); i++)
+            {
+                snprintf(buf, sizeof(buf)-1, "%.1f %s/s (%lu us)", (lats[i]->count-prev[i]->count)*1000000.0/usec,
+                    lats[i]->name, (lats[i]->usec-prev[i]->usec)/(lats[i]->count-prev[i]->count > 0 ? lats[i]->count-prev[i]->count : 1));
+                int k;
+                for (k = strlen(buf); k < strlen(lats[i]->name)+21; k++)
+                    buf[k] = ' ';
+                buf[k] = 0;
+                printf("%s", buf);
+            }
+            printf("\n");
+        }
+        else
+        {
+            int64_t runtime = (cur_stat_time.tv_sec - start_stat_time.tv_sec)*1000000 +
+                (cur_stat_time.tv_nsec - start_stat_time.tv_nsec)/1000;
+            printf("{\"runtime\":%.1f", (double)runtime/1000000.0);
+            for (int i = 0; i < sizeof(lats)/sizeof(lats[0]); i++)
+            {
+                if (lats[i]->count > prev[i]->count)
+                {
+                    printf(
+                        ",\"%s\":{\"avg\":{\"iops\":%.1f,\"usec\":%lu},\"total\":{\"count\":%lu,\"usec\":%lu}}",
+                        lats[i]->name, (lats[i]->count-prev[i]->count)*1000000.0/usec,
+                        (lats[i]->usec-prev[i]->usec)/(lats[i]->count-prev[i]->count),
+                        lats[i]->count, lats[i]->usec
+                    );
+                }
+            }
+            printf("}\n");
+        }
+    }
+    prev_stat = stat;
+    prev_stat_time = cur_stat_time;
+}
+
+void kv_test_t::print_total_stats()
+{
+    if (!json_output)
+        printf("Total:\n");
+    kv_test_stat_t start_stats;
+    timespec start_stat_time = this->start_stat_time;
+    print_stats(start_stats, start_stat_time);
+}
+
+void kv_test_t::start_change(const std::string & key)
+{
+    changing_keys.insert(key);
+    for (auto lst: listings)
+    {
+        lst->inflights.insert(key);
+    }
+}
+
+void kv_test_t::stop_change(const std::string & key)
+{
+    changing_keys.erase(key);
+}
+
+int main(int narg, const char *args[])
+{
+    setvbuf(stdout, NULL, _IONBF, 0);
+    setvbuf(stderr, NULL, _IONBF, 0);
+    exe_name = args[0];
+    kv_test_t *p = new kv_test_t();
+    p->run(kv_test_t::parse_args(narg, args));
+    delete p;
+    return 0;
+}

src/messenger.h

@@ -149,7 +149,7 @@ public:
     std::map<osd_num_t, osd_wanted_peer_t> wanted_peers;
     std::map<uint64_t, int> osd_peer_fds;
     // op statistics
-    osd_op_stats_t stats;
+    osd_op_stats_t stats, recovery_stats;
 
     void init();
     void parse_config(const json11::Json & config);
@@ -175,6 +175,7 @@ public:
     bool connect_rdma(int peer_fd, std::string rdma_address, uint64_t client_max_msg);
 #endif
 
+    void inc_op_stats(osd_op_stats_t & stats, uint64_t opcode, timespec & tv_begin, timespec & tv_end, uint64_t len);
     void measure_exec(osd_op_t *cur_op);
 
 protected:

src/msgr_op.cpp

@@ -24,3 +24,17 @@ osd_op_t::~osd_op_t()
         free(buf);
     }
 }
+
+bool osd_op_t::is_recovery_related()
+{
+    return (req.hdr.opcode == OSD_OP_SEC_READ ||
+        req.hdr.opcode == OSD_OP_SEC_WRITE ||
+        req.hdr.opcode == OSD_OP_SEC_WRITE_STABLE) &&
+        (req.sec_rw.flags & OSD_OP_RECOVERY_RELATED) ||
+        req.hdr.opcode == OSD_OP_SEC_DELETE &&
+        (req.sec_del.flags & OSD_OP_RECOVERY_RELATED) ||
+        req.hdr.opcode == OSD_OP_SEC_STABILIZE &&
+        (req.sec_stab.flags & OSD_OP_RECOVERY_RELATED) ||
+        req.hdr.opcode == OSD_OP_SEC_SYNC &&
+        (req.sec_sync.flags & OSD_OP_RECOVERY_RELATED);
+}

src/msgr_op.h

@@ -173,4 +173,6 @@ struct osd_op_t
     osd_op_buf_list_t iov;
 
     ~osd_op_t();
+
+    bool is_recovery_related();
 };

src/msgr_send.cpp

@@ -131,6 +131,23 @@ void osd_messenger_t::outbox_push(osd_op_t *cur_op)
     }
 }
 
+void osd_messenger_t::inc_op_stats(osd_op_stats_t & stats, uint64_t opcode, timespec & tv_begin, timespec & tv_end, uint64_t len)
+{
+    uint64_t usecs = (
+        (tv_end.tv_sec - tv_begin.tv_sec)*1000000 +
+        (tv_end.tv_nsec - tv_begin.tv_nsec)/1000
+    );
+    stats.op_stat_count[opcode]++;
+    if (!stats.op_stat_count[opcode])
+    {
+        stats.op_stat_count[opcode] = 1;
+        stats.op_stat_sum[opcode] = 0;
+        stats.op_stat_bytes[opcode] = 0;
+    }
+    stats.op_stat_sum[opcode] += usecs;
+    stats.op_stat_bytes[opcode] += len;
+}
+
 void osd_messenger_t::measure_exec(osd_op_t *cur_op)
 {
     // Measure execution latency
@@ -142,29 +159,24 @@ void osd_messenger_t::measure_exec(osd_op_t *cur_op)
     {
         clock_gettime(CLOCK_REALTIME, &cur_op->tv_end);
     }
-    stats.op_stat_count[cur_op->req.hdr.opcode]++;
+    uint64_t len = 0;
-    if (!stats.op_stat_count[cur_op->req.hdr.opcode])
-    {
-        stats.op_stat_count[cur_op->req.hdr.opcode]++;
-        stats.op_stat_sum[cur_op->req.hdr.opcode] = 0;
-        stats.op_stat_bytes[cur_op->req.hdr.opcode] = 0;
-    }
-    stats.op_stat_sum[cur_op->req.hdr.opcode] += (
-        (cur_op->tv_end.tv_sec - cur_op->tv_begin.tv_sec)*1000000 +
-        (cur_op->tv_end.tv_nsec - cur_op->tv_begin.tv_nsec)/1000
-    );
     if (cur_op->req.hdr.opcode == OSD_OP_READ ||
         cur_op->req.hdr.opcode == OSD_OP_WRITE ||
         cur_op->req.hdr.opcode == OSD_OP_SCRUB)
     {
         // req.rw.len is internally set to the full object size for scrubs
-        stats.op_stat_bytes[cur_op->req.hdr.opcode] += cur_op->req.rw.len;
+        len = cur_op->req.rw.len;
     }
     else if (cur_op->req.hdr.opcode == OSD_OP_SEC_READ ||
         cur_op->req.hdr.opcode == OSD_OP_SEC_WRITE ||
         cur_op->req.hdr.opcode == OSD_OP_SEC_WRITE_STABLE)
     {
-        stats.op_stat_bytes[cur_op->req.hdr.opcode] += cur_op->req.sec_rw.len;
+        len = cur_op->req.sec_rw.len;
+    }
+    inc_op_stats(stats, cur_op->req.hdr.opcode, cur_op->tv_begin, cur_op->tv_end, len);
+    if (cur_op->is_recovery_related())
+    {
+        inc_op_stats(recovery_stats, cur_op->req.hdr.opcode, cur_op->tv_begin, cur_op->tv_end, len);
     }
 }
 

src/nbd_proxy.cpp

@@ -30,7 +30,7 @@ protected:
     std::string image_name;
     uint64_t inode = 0;
     uint64_t device_size = 0;
-    int nbd_timeout = 30;
+    int nbd_timeout = 300;
     int nbd_max_devices = 64;
     int nbd_max_part = 3;
     inode_watch_t *watch = NULL;
@@ -135,14 +135,16 @@ public:
             "  %s unmap /dev/nbd0\n"
             "  %s ls [--json]\n"
             "OPTIONS:\n"
-            "  All usual Vitastor config options like --etcd_address <etcd_address> plus NBD-specific:\n"
+            "  All usual Vitastor config options like --config_file <path_to_config> plus NBD-specific:\n"
-            "  --nbd_timeout 30\n"
+            "  --nbd_timeout 300\n"
             "    Timeout for I/O operations in seconds after exceeding which the kernel stops\n"
             "    the device. You can set it to 0 to disable the timeout, but beware that you\n"
             "    won't be able to stop the device at all if vitastor-nbd process dies.\n"
             "  --nbd_max_devices 64 --nbd_max_part 3\n"
             "    Options for the \"nbd\" kernel module when modprobing it (nbds_max and max_part).\n"
             "    note that maximum allowed (nbds_max)*(1+max_part) is 256.\n"
+            "    Note that nbd_timeout, nbd_max_devices and nbd_max_part options may also be specified\n"
+            "    in /etc/vitastor/vitastor.conf or in other configuration file specified with --config_file.\n"
             "  --logfile /path/to/log/file.txt\n"
             "    Wite log messages to the specified file instead of dropping them (in background mode)\n"
             "    or printing them to the standard output (in foreground mode).\n"
@@ -204,17 +206,18 @@ public:
                 exit(1);
             }
         }
-        if (cfg["nbd_max_devices"].is_number() || cfg["nbd_max_devices"].is_string())
+        auto file_config = osd_messenger_t::read_config(cfg);
+        if (file_config["nbd_max_devices"].is_number() || file_config["nbd_max_devices"].is_string())
         {
-            nbd_max_devices = cfg["nbd_max_devices"].uint64_value();
+            nbd_max_devices = file_config["nbd_max_devices"].uint64_value();
         }
-        if (cfg["nbd_max_part"].is_number() || cfg["nbd_max_part"].is_string())
+        if (file_config["nbd_max_part"].is_number() || file_config["nbd_max_part"].is_string())
         {
-            nbd_max_part = cfg["nbd_max_part"].uint64_value();
+            nbd_max_part = file_config["nbd_max_part"].uint64_value();
         }
-        if (cfg["nbd_timeout"].is_number() || cfg["nbd_timeout"].is_string())
+        if (file_config["nbd_timeout"].is_number() || file_config["nbd_timeout"].is_string())
         {
-            nbd_timeout = cfg["nbd_timeout"].uint64_value();
+            nbd_timeout = file_config["nbd_timeout"].uint64_value();
         }
         if (cfg["client_writeback_allowed"].is_null())
         {
@@ -272,7 +275,7 @@ public:
             int i = 0;
             while (true)
             {
-                int r = run_nbd(sockfd, i, device_size, NBD_FLAG_SEND_FLUSH, 30, bg);
+                int r = run_nbd(sockfd, i, device_size, NBD_FLAG_SEND_FLUSH, nbd_timeout, bg);
                 if (r == 0)
                 {
                     printf("/dev/nbd%d\n", i);

src/nfs_proxy.cpp

@@ -56,7 +56,7 @@ json11::Json::object nfs_proxy_t::parse_args(int narg, const char *args[])
                 "(c) Vitaliy Filippov, 2021-2022 (VNPL-1.1)\n"
                 "\n"
                 "USAGE:\n"
-                "  %s [--etcd_address ADDR] [OTHER OPTIONS]\n"
+                "  %s [STANDARD OPTIONS] [OTHER OPTIONS]\n"
                 "  --subdir <DIR>    export images prefixed <DIR>/ (default empty - export all images)\n"
                 "  --portmap 0       do not listen on port 111 (portmap/rpcbind, requires root)\n"
                 "  --bind <IP>       bind service to <IP> address (default 0.0.0.0)\n"

src/osd.cpp

@@ -68,14 +68,21 @@ osd_t::osd_t(const json11::Json & config, ring_loop_t *ringloop)
         }
     }
 
-    print_stats_timer_id = this->tfd->set_timer(print_stats_interval*1000, true, [this](int timer_id)
+    if (print_stats_timer_id == -1)
     {
-        print_stats();
+        print_stats_timer_id = this->tfd->set_timer(print_stats_interval*1000, true, [this](int timer_id)
-    });
+        {
-    slow_log_timer_id = this->tfd->set_timer(slow_log_interval*1000, true, [this](int timer_id)
+            print_stats();
+        });
+    }
+    if (slow_log_timer_id == -1)
     {
-        print_slow();
+        slow_log_timer_id = this->tfd->set_timer(slow_log_interval*1000, true, [this](int timer_id)
-    });
+        {
+            print_slow();
+        });
+    }
+    apply_recovery_tune_interval();
 
     msgr.tfd = this->tfd;
     msgr.ringloop = this->ringloop;
@@ -97,6 +104,11 @@ osd_t::~osd_t()
         tfd->clear_timer(slow_log_timer_id);
         slow_log_timer_id = -1;
     }
+    if (rtune_timer_id >= 0)
+    {
+        tfd->clear_timer(rtune_timer_id);
+        rtune_timer_id = -1;
+    }
     if (print_stats_timer_id >= 0)
     {
         tfd->clear_timer(print_stats_timer_id);
@@ -196,6 +208,30 @@ void osd_t::parse_config(bool init)
     recovery_queue_depth = config["recovery_queue_depth"].uint64_value();
     if (recovery_queue_depth < 1 || recovery_queue_depth > MAX_RECOVERY_QUEUE)
         recovery_queue_depth = DEFAULT_RECOVERY_QUEUE;
+    recovery_sleep_us = config["recovery_sleep_us"].uint64_value();
+    recovery_tune_util_low = config["recovery_tune_util_low"].is_null()
+        ? 0.1 : config["recovery_tune_util_low"].number_value();
+    if (recovery_tune_util_low < 0.01)
+        recovery_tune_util_low = 0.01;
+    recovery_tune_util_high = config["recovery_tune_util_high"].is_null()
+        ? 1.0 : config["recovery_tune_util_high"].number_value();
+    if (recovery_tune_util_high < 0.01)
+        recovery_tune_util_high = 0.01;
+    recovery_tune_client_util_low = config["recovery_tune_client_util_low"].is_null()
+        ? 0 : config["recovery_tune_client_util_low"].number_value();
+    if (recovery_tune_client_util_low < 0.01)
+        recovery_tune_client_util_low = 0.01;
+    recovery_tune_client_util_high = config["recovery_tune_client_util_high"].is_null()
+        ? 0.5 : config["recovery_tune_client_util_high"].number_value();
+    if (recovery_tune_client_util_high < 0.01)
+        recovery_tune_client_util_high = 0.01;
+    auto old_recovery_tune_interval = recovery_tune_interval;
+    recovery_tune_interval = config["recovery_tune_interval"].is_null()
+        ? 1 : config["recovery_tune_interval"].uint64_value();
+    recovery_tune_agg_interval = config["recovery_tune_agg_interval"].is_null()
+        ? 10 : config["recovery_tune_agg_interval"].uint64_value();
+    recovery_tune_sleep_min_us = config["recovery_tune_sleep_min_us"].is_null()
+        ? 10 : config["recovery_tune_sleep_min_us"].uint64_value();
     recovery_pg_switch = config["recovery_pg_switch"].uint64_value();
     if (recovery_pg_switch < 1)
         recovery_pg_switch = DEFAULT_RECOVERY_PG_SWITCH;
@@ -274,6 +310,10 @@ void osd_t::parse_config(bool init)
             print_slow();
         });
     }
+    if (old_recovery_tune_interval != recovery_tune_interval)
+    {
+        apply_recovery_tune_interval();
+    }
 }
 
 void osd_t::bind_socket()
@@ -421,14 +461,6 @@ void osd_t::exec_op(osd_op_t *cur_op)
     }
 }
 
-void osd_t::reset_stats()
-{
-    msgr.stats = {};
-    prev_stats = {};
-    memset(recovery_stat_count, 0, sizeof(recovery_stat_count));
-    memset(recovery_stat_bytes, 0, sizeof(recovery_stat_bytes));
-}
-
 void osd_t::print_stats()
 {
     for (int i = OSD_OP_MIN; i <= OSD_OP_MAX; i++)
@@ -466,19 +498,20 @@ void osd_t::print_stats()
     }
     for (int i = 0; i < 2; i++)
     {
-        if (recovery_stat_count[0][i] != recovery_stat_count[1][i])
+        if (recovery_stat[i].count > recovery_print_prev[i].count)
         {
-            uint64_t bw = (recovery_stat_bytes[0][i] - recovery_stat_bytes[1][i]) / print_stats_interval;
+            uint64_t bw = (recovery_stat[i].bytes - recovery_print_prev[i].bytes) / print_stats_interval;
             printf(
-                "[OSD %lu] %s recovery: %.1f op/s, B/W: %.2f %s\n", osd_num, recovery_stat_names[i],
+                "[OSD %lu] %s recovery: %.1f op/s, B/W: %.2f %s, avg latency %ld us, delay %ld us\n", osd_num, recovery_stat_names[i],
-                (recovery_stat_count[0][i] - recovery_stat_count[1][i]) * 1.0 / print_stats_interval,
+                (recovery_stat[i].count - recovery_print_prev[i].count) * 1.0 / print_stats_interval,
                 (bw > 1024*1024*1024 ? bw/1024.0/1024/1024 : (bw > 1024*1024 ? bw/1024.0/1024 : bw/1024.0)),
-                (bw > 1024*1024*1024 ? "GB/s" : (bw > 1024*1024 ? "MB/s" : "KB/s"))
+                (bw > 1024*1024*1024 ? "GB/s" : (bw > 1024*1024 ? "MB/s" : "KB/s")),
+                (recovery_stat[i].usec - recovery_print_prev[i].usec) / (recovery_stat[i].count - recovery_print_prev[i].count),
+                recovery_target_sleep_us
             );
-            recovery_stat_count[1][i] = recovery_stat_count[0][i];
-            recovery_stat_bytes[1][i] = recovery_stat_bytes[0][i];
         }
     }
+    memcpy(recovery_print_prev, recovery_stat, sizeof(recovery_stat));
     if (corrupted_objects > 0)
     {
         printf("[OSD %lu] %lu object(s) corrupted\n", osd_num, corrupted_objects);
@@ -572,8 +605,8 @@ void osd_t::print_slow()
                     op->req.hdr.opcode == OSD_OP_SEC_STABILIZE || op->req.hdr.opcode == OSD_OP_SEC_ROLLBACK ||
                     op->req.hdr.opcode == OSD_OP_SEC_READ_BMP)
                 {
-                    bufprintf(" state=%d", PRIV(op->bs_op)->op_state);
+                    bufprintf(" state=%d", op->bs_op ? PRIV(op->bs_op)->op_state : -1);
-                    int wait_for = PRIV(op->bs_op)->wait_for;
+                    int wait_for = op->bs_op ? PRIV(op->bs_op)->wait_for : 0;
                     if (wait_for)
                     {
                         bufprintf(" wait=%d (detail=%lu)", wait_for, PRIV(op->bs_op)->wait_detail);

src/osd.h

@@ -34,7 +34,7 @@
 #define DEFAULT_AUTOSYNC_INTERVAL 5
 #define DEFAULT_AUTOSYNC_WRITES 128
 #define MAX_RECOVERY_QUEUE 2048
-#define DEFAULT_RECOVERY_QUEUE 4
+#define DEFAULT_RECOVERY_QUEUE 1
 #define DEFAULT_RECOVERY_PG_SWITCH 128
 #define DEFAULT_RECOVERY_BATCH 16
 
@@ -87,6 +87,11 @@ struct osd_chain_read_t
 
 struct osd_rmw_stripe_t;
 
+struct recovery_stat_t
+{
+    uint64_t count, usec, bytes;
+};
+
 class osd_t
 {
     // config
@@ -111,7 +116,15 @@ class osd_t
     int immediate_commit = IMMEDIATE_NONE;
     int autosync_interval = DEFAULT_AUTOSYNC_INTERVAL; // "emergency" sync every 5 seconds
     int autosync_writes = DEFAULT_AUTOSYNC_WRITES;
-    int recovery_queue_depth = DEFAULT_RECOVERY_QUEUE;
+    uint64_t recovery_queue_depth = 1;
+    uint64_t recovery_sleep_us = 0;
+    double recovery_tune_util_low = 0.1;
+    double recovery_tune_client_util_low = 0;
+    double recovery_tune_util_high = 1.0;
+    double recovery_tune_client_util_high = 0.5;
+    int recovery_tune_interval = 1;
+    int recovery_tune_agg_interval = 10;
+    int recovery_tune_sleep_min_us = 10;
     int recovery_pg_switch = DEFAULT_RECOVERY_PG_SWITCH;
     int recovery_sync_batch = DEFAULT_RECOVERY_BATCH;
     int inode_vanish_time = 60;
@@ -189,8 +202,18 @@ class osd_t
     std::map<uint64_t, inode_stats_t> inode_stats;
     std::map<uint64_t, timespec> vanishing_inodes;
     const char* recovery_stat_names[2] = { "degraded", "misplaced" };
-    uint64_t recovery_stat_count[2][2] = {};
+    recovery_stat_t recovery_stat[2];
-    uint64_t recovery_stat_bytes[2][2] = {};
+    recovery_stat_t recovery_print_prev[2];
+
+    // recovery auto-tuning
+    int rtune_timer_id = -1;
+    uint64_t rtune_avg_lat = 0;
+    double rtune_client_util = 0, rtune_target_util = 1;
+    osd_op_stats_t rtune_prev_stats, rtune_prev_recovery_stats;
+    std::vector<uint64_t> recovery_target_sleep_items;
+    uint64_t recovery_target_sleep_us = 0;
+    uint64_t recovery_target_sleep_total = 0;
+    int recovery_target_sleep_cur = 0, recovery_target_sleep_count = 0;
 
     // cluster connection
     void parse_config(bool init);
@@ -208,8 +231,9 @@ class osd_t
     void create_osd_state();
     void renew_lease(bool reload);
     void print_stats();
+    void tune_recovery();
+    void apply_recovery_tune_interval();
     void print_slow();
-    void reset_stats();
     json11::Json get_statistics();
     void report_statistics();
     void report_pg_state(pg_t & pg);
@@ -238,6 +262,7 @@ class osd_t
     bool submit_flush_op(pool_id_t pool_id, pg_num_t pg_num, pg_flush_batch_t *fb, bool rollback, osd_num_t peer_osd, int count, obj_ver_id *data);
     bool pick_next_recovery(osd_recovery_op_t &op);
     void submit_recovery_op(osd_recovery_op_t *op);
+    void finish_recovery_op(osd_recovery_op_t *op);
     bool continue_recovery();
     pg_osd_set_state_t* change_osd_set(pg_osd_set_state_t *st, pg_t *pg);
 
@@ -279,7 +304,7 @@ class osd_t
     bool remember_unstable_write(osd_op_t *cur_op, pg_t & pg, pg_osd_set_t & loc_set, int base_state);
     void handle_primary_subop(osd_op_t *subop, osd_op_t *cur_op);
     void handle_primary_bs_subop(osd_op_t *subop);
-    void add_bs_subop_stats(osd_op_t *subop);
+    void add_bs_subop_stats(osd_op_t *subop, bool recovery_related = false);
     void pg_cancel_write_queue(pg_t & pg, osd_op_t *first_op, object_id oid, int retval);
 
     void submit_primary_subops(int submit_type, uint64_t op_version, const uint64_t* osd_set, osd_op_t *cur_op);

src/osd_cluster.cpp

@@ -213,12 +213,14 @@ json11::Json osd_t::get_statistics()
     st["subop_stats"] = subop_stats;
     st["recovery_stats"] = json11::Json::object {
         { recovery_stat_names[0], json11::Json::object {
-            { "count", recovery_stat_count[0][0] },
+            { "count", recovery_stat[0].count },
-            { "bytes", recovery_stat_bytes[0][0] },
+            { "bytes", recovery_stat[0].bytes },
+            { "usec", recovery_stat[0].usec },
         } },
         { recovery_stat_names[1], json11::Json::object {
-            { "count", recovery_stat_count[0][1] },
+            { "count", recovery_stat[1].count },
-            { "bytes", recovery_stat_bytes[0][1] },
+            { "bytes", recovery_stat[1].bytes },
+            { "usec", recovery_stat[1].usec },
         } },
     };
     return st;
@@ -649,7 +651,7 @@ void osd_t::apply_pg_config()
         {
             pg_num_t pg_num = kv.first;
             auto & pg_cfg = kv.second;
-            bool take = pg_cfg.exists && pg_cfg.primary == this->osd_num &&
+            bool take = pg_cfg.config_exists && pg_cfg.primary == this->osd_num &&
                 !pg_cfg.pause && (!pg_cfg.cur_primary || pg_cfg.cur_primary == this->osd_num);
             auto pg_it = this->pgs.find({ .pool_id = pool_id, .pg_num = pg_num });
             bool currently_taken = pg_it != this->pgs.end() && pg_it->second.state != PG_OFFLINE;

src/osd_flush.cpp

@@ -325,26 +325,129 @@ void osd_t::submit_recovery_op(osd_recovery_op_t *op)
         {
             printf("Recovery operation done for %lx:%lx\n", op->oid.inode, op->oid.stripe);
         }
-        // CAREFUL! op = &recovery_ops[op->oid]. Don't access op->* after recovery_ops.erase()
+        finish_recovery_op(op);
-        op->osd_op = NULL;
-        recovery_ops.erase(op->oid);
-        delete osd_op;
-        if (immediate_commit != IMMEDIATE_ALL)
-        {
-            recovery_done++;
-            if (recovery_done >= recovery_sync_batch)
-            {
-                // Force sync every <recovery_sync_batch> operations
-                // This is required not to pile up an excessive amount of delete operations
-                autosync();
-                recovery_done = 0;
-            }
-        }
-        continue_recovery();
     };
     exec_op(op->osd_op);
 }
 
+void osd_t::apply_recovery_tune_interval()
+{
+    if (rtune_timer_id >= 0)
+    {
+        tfd->clear_timer(rtune_timer_id);
+        rtune_timer_id = -1;
+    }
+    if (recovery_tune_interval != 0)
+    {
+        rtune_timer_id = this->tfd->set_timer(recovery_tune_interval*1000, true, [this](int timer_id)
+        {
+            tune_recovery();
+        });
+    }
+    else
+    {
+        recovery_target_sleep_us = recovery_sleep_us;
+    }
+}
+
+void osd_t::finish_recovery_op(osd_recovery_op_t *op)
+{
+    // CAREFUL! op = &recovery_ops[op->oid]. Don't access op->* after recovery_ops.erase()
+    delete op->osd_op;
+    op->osd_op = NULL;
+    recovery_ops.erase(op->oid);
+    if (immediate_commit != IMMEDIATE_ALL)
+    {
+        recovery_done++;
+        if (recovery_done >= recovery_sync_batch)
+        {
+            // Force sync every <recovery_sync_batch> operations
+            // This is required not to pile up an excessive amount of delete operations
+            autosync();
+            recovery_done = 0;
+        }
+    }
+    continue_recovery();
+}
+
+void osd_t::tune_recovery()
+{
+    static int accounted_ops[] = {
+        OSD_OP_SEC_READ, OSD_OP_SEC_WRITE, OSD_OP_SEC_WRITE_STABLE,
+        OSD_OP_SEC_STABILIZE, OSD_OP_SEC_SYNC, OSD_OP_SEC_DELETE
+    };
+    uint64_t total_client_usec = 0, total_recovery_usec = 0, recovery_count = 0;
+    for (int i = 0; i < sizeof(accounted_ops)/sizeof(accounted_ops[0]); i++)
+    {
+        total_client_usec += (msgr.stats.op_stat_sum[accounted_ops[i]]
+            - rtune_prev_stats.op_stat_sum[accounted_ops[i]]);
+        total_recovery_usec += (msgr.recovery_stats.op_stat_sum[accounted_ops[i]]
+            - rtune_prev_recovery_stats.op_stat_sum[accounted_ops[i]]);
+        recovery_count += (msgr.recovery_stats.op_stat_count[accounted_ops[i]]
+            - rtune_prev_recovery_stats.op_stat_count[accounted_ops[i]]);
+        rtune_prev_stats.op_stat_sum[accounted_ops[i]] = msgr.stats.op_stat_sum[accounted_ops[i]];
+        rtune_prev_recovery_stats.op_stat_sum[accounted_ops[i]] = msgr.recovery_stats.op_stat_sum[accounted_ops[i]];
+        rtune_prev_recovery_stats.op_stat_count[accounted_ops[i]] = msgr.recovery_stats.op_stat_count[accounted_ops[i]];
+    }
+    total_client_usec -= total_recovery_usec;
+    if (recovery_count == 0)
+    {
+        return;
+    }
+    // example:
+    // total 3 GB/s
+    // recovery queue 1
+    // 120 OSDs
+    // EC 5+3
+    // 128kb block_size => 640kb object
+    // 3000*1024/640/120 = 40 MB/s per OSD = 64 recovered objects per OSD
+    //   = 64*8*2 subops = 1024 recovery subop iops
+    // 8 recovery subop queue
+    // => subop avg latency = 0.0078125 sec
+    // utilisation = 8
+    // target util 1
+    // intuitively target latency should be 8x of real
+    // target_lat = rtune_avg_lat * utilisation / target_util
+    //            = rtune_avg_lat * rtune_avg_lat * rtune_avg_iops / target_util
+    //            = 0.0625
+    // recovery utilisation will be 1
+    rtune_client_util = total_client_usec/1000000.0/recovery_tune_interval;
+    rtune_target_util = (rtune_client_util < recovery_tune_client_util_low
+        ? recovery_tune_util_high
+        : recovery_tune_util_low + (rtune_client_util >= recovery_tune_client_util_high
+            ? 0 : (recovery_tune_util_high-recovery_tune_util_low)*
+                (recovery_tune_client_util_high-rtune_client_util)/(recovery_tune_client_util_high-recovery_tune_client_util_low)
+        )
+    );
+    rtune_avg_lat = total_recovery_usec/recovery_count;
+    uint64_t target_lat = rtune_avg_lat * rtune_avg_lat/1000000.0 * recovery_count/recovery_tune_interval / rtune_target_util;
+    auto sleep_us = target_lat > rtune_avg_lat+recovery_tune_sleep_min_us ? target_lat-rtune_avg_lat : 0;
+    if (recovery_target_sleep_items.size() != recovery_tune_agg_interval)
+    {
+        recovery_target_sleep_items.resize(recovery_tune_agg_interval);
+        for (int i = 0; i < recovery_tune_agg_interval; i++)
+            recovery_target_sleep_items[i] = 0;
+        recovery_target_sleep_total = 0;
+        recovery_target_sleep_cur = 0;
+        recovery_target_sleep_count = 0;
+    }
+    recovery_target_sleep_total -= recovery_target_sleep_items[recovery_target_sleep_cur];
+    recovery_target_sleep_items[recovery_target_sleep_cur] = sleep_us;
+    recovery_target_sleep_cur = (recovery_target_sleep_cur+1) % recovery_tune_agg_interval;
+    recovery_target_sleep_total += sleep_us;
+    if (recovery_target_sleep_count < recovery_tune_agg_interval)
+        recovery_target_sleep_count++;
+    recovery_target_sleep_us = recovery_target_sleep_total / recovery_target_sleep_count;
+    if (log_level > 4)
+    {
+        printf(
+            "[OSD %lu] auto-tune: client util: %.2f, recovery util: %.2f, lat: %lu us -> target util %.2f, delay %lu us\n",
+            osd_num, rtune_client_util, total_recovery_usec/1000000.0/recovery_tune_interval,
+            rtune_avg_lat, rtune_target_util, recovery_target_sleep_us
+        );
+    }
+}
+
 // Just trigger write requests for degraded objects. They'll be recovered during writing
 bool osd_t::continue_recovery()
 {

src/osd_ops.h

@@ -34,6 +34,7 @@
 #define OSD_OP_MAX                  18
 #define OSD_RW_MAX                  64*1024*1024
 #define OSD_PROTOCOL_VERSION        1
+#define OSD_OP_RECOVERY_RELATED     (uint32_t)1
 
 // Memory alignment for direct I/O (usually 512 bytes)
 #ifndef DIRECT_IO_ALIGNMENT
@@ -88,7 +89,8 @@ struct __attribute__((__packed__)) osd_op_sec_rw_t
     uint32_t len;
     // bitmap/attribute length - bitmap comes after header, but before data
     uint32_t attr_len;
-    uint32_t pad0;
+    // the only possible flag is OSD_OP_RECOVERY_RELATED
+    uint32_t flags;
 };
 
 struct __attribute__((__packed__)) osd_reply_sec_rw_t
@@ -109,6 +111,9 @@ struct __attribute__((__packed__)) osd_op_sec_del_t
     object_id oid;
     // delete version (automatic or specific)
     uint64_t version;
+    // the only possible flag is OSD_OP_RECOVERY_RELATED
+    uint32_t flags;
+    uint32_t pad0;
 };
 
 struct __attribute__((__packed__)) osd_reply_sec_del_t
@@ -121,6 +126,9 @@ struct __attribute__((__packed__)) osd_reply_sec_del_t
 struct __attribute__((__packed__)) osd_op_sec_sync_t
 {
     osd_op_header_t header;
+    // the only possible flag is OSD_OP_RECOVERY_RELATED
+    uint32_t flags;
+    uint32_t pad0;
 };
 
 struct __attribute__((__packed__)) osd_reply_sec_sync_t
@@ -134,6 +142,9 @@ struct __attribute__((__packed__)) osd_op_sec_stab_t
     osd_op_header_t header;
     // obj_ver_id array length in bytes
     uint64_t len;
+    // the only possible flag is OSD_OP_RECOVERY_RELATED
+    uint32_t flags;
+    uint32_t pad0;
 };
 typedef osd_op_sec_stab_t osd_op_sec_rollback_t;
 

src/osd_primary_subops.cpp

@@ -3,13 +3,15 @@
 
 #include "osd_primary.h"
 
+#define SELF_FD -1
+
 void osd_t::autosync()
 {
     if (immediate_commit != IMMEDIATE_ALL && !autosync_op)
     {
         autosync_op = new osd_op_t();
         autosync_op->op_type = OSD_OP_IN;
-        autosync_op->peer_fd = -1;
+        autosync_op->peer_fd = SELF_FD;
         autosync_op->req = (osd_any_op_t){
             .sync = {
                 .header = {
@@ -85,9 +87,13 @@ void osd_t::finish_op(osd_op_t *cur_op, int retval)
     cur_op->reply.hdr.id = cur_op->req.hdr.id;
     cur_op->reply.hdr.opcode = cur_op->req.hdr.opcode;
     cur_op->reply.hdr.retval = retval;
-    if (cur_op->peer_fd == -1)
+    if (cur_op->peer_fd == SELF_FD)
     {
-        msgr.measure_exec(cur_op);
+        // Do not include internal primary writes (recovery/rebalance) into client op statistics
+        if (cur_op->req.hdr.opcode != OSD_OP_WRITE)
+        {
+            msgr.measure_exec(cur_op);
+        }
         // Copy lambda to be unaffected by `delete op`
         std::function<void(osd_op_t*)>(cur_op->callback)(cur_op);
     }
@@ -215,6 +221,7 @@ int osd_t::submit_primary_subop_batch(int submit_type, inode_t inode, uint64_t o
                     .offset = wr ? si->write_start : si->read_start,
                     .len = subop_len,
                     .attr_len = wr ? clean_entry_bitmap_size : 0,
+                    .flags = cur_op->peer_fd == SELF_FD && cur_op->req.hdr.opcode != OSD_OP_SCRUB ? OSD_OP_RECOVERY_RELATED : 0,
                 };
 #ifdef OSD_DEBUG
                 printf(
@@ -294,7 +301,8 @@ void osd_t::handle_primary_bs_subop(osd_op_t *subop)
             " retval = "+std::to_string(bs_op->retval)+")"
         );
     }
-    add_bs_subop_stats(subop);
+    bool recovery_related = cur_op->peer_fd == SELF_FD && cur_op->req.hdr.opcode != OSD_OP_SCRUB;
+    add_bs_subop_stats(subop, recovery_related);
     subop->req.hdr.opcode = bs_op_to_osd_op[bs_op->opcode];
     subop->reply.hdr.retval = bs_op->retval;
     if (bs_op->opcode == BS_OP_READ || bs_op->opcode == BS_OP_WRITE || bs_op->opcode == BS_OP_WRITE_STABLE)
@@ -306,30 +314,33 @@ void osd_t::handle_primary_bs_subop(osd_op_t *subop)
     }
     delete bs_op;
     subop->bs_op = NULL;
-    subop->peer_fd = -1;
+    subop->peer_fd = SELF_FD;
-    handle_primary_subop(subop, cur_op);
+    if (recovery_related && recovery_target_sleep_us)
+    {
+        tfd->set_timer_us(recovery_target_sleep_us, false, [=](int timer_id)
+        {
+            handle_primary_subop(subop, cur_op);
+        });
+    }
+    else
+    {
+        handle_primary_subop(subop, cur_op);
+    }
 }
 
-void osd_t::add_bs_subop_stats(osd_op_t *subop)
+void osd_t::add_bs_subop_stats(osd_op_t *subop, bool recovery_related)
 {
     // Include local blockstore ops in statistics
     uint64_t opcode = bs_op_to_osd_op[subop->bs_op->opcode];
     timespec tv_end;
     clock_gettime(CLOCK_REALTIME, &tv_end);
-    msgr.stats.op_stat_count[opcode]++;
+    uint64_t len = (opcode == OSD_OP_SEC_READ || opcode == OSD_OP_SEC_WRITE)
-    if (!msgr.stats.op_stat_count[opcode])
+        ? subop->bs_op->len : 0;
+    msgr.inc_op_stats(msgr.stats, opcode, subop->tv_begin, tv_end, len);
+    if (recovery_related)
     {
-        msgr.stats.op_stat_count[opcode] = 1;
+        // It is OSD_OP_RECOVERY_RELATED
-        msgr.stats.op_stat_sum[opcode] = 0;
+        msgr.inc_op_stats(msgr.recovery_stats, opcode, subop->tv_begin, tv_end, len);
-        msgr.stats.op_stat_bytes[opcode] = 0;
-    }
-    msgr.stats.op_stat_sum[opcode] += (
-        (tv_end.tv_sec - subop->tv_begin.tv_sec)*1000000 +
-        (tv_end.tv_nsec - subop->tv_begin.tv_nsec)/1000
-    );
-    if (opcode == OSD_OP_SEC_READ || opcode == OSD_OP_SEC_WRITE)
-    {
-        msgr.stats.op_stat_bytes[opcode] += subop->bs_op->len;
     }
 }
 
@@ -552,6 +563,7 @@ void osd_t::submit_primary_del_batch(osd_op_t *cur_op, obj_ver_osd_t *chunks_to_
                 },
                 .oid = chunk.oid,
                 .version = chunk.version,
+                .flags = cur_op->peer_fd == SELF_FD && cur_op->req.hdr.opcode != OSD_OP_SCRUB ? OSD_OP_RECOVERY_RELATED : 0,
             } };
             subops[i].callback = [cur_op, this](osd_op_t *subop)
             {
@@ -609,6 +621,7 @@ int osd_t::submit_primary_sync_subops(osd_op_t *cur_op)
                     .id = msgr.next_subop_id++,
                     .opcode = OSD_OP_SEC_SYNC,
                 },
+                .flags = cur_op->peer_fd == SELF_FD && cur_op->req.hdr.opcode != OSD_OP_SCRUB ? OSD_OP_RECOVERY_RELATED : 0,
             } };
             subops[i].callback = [cur_op, this](osd_op_t *subop)
             {
@@ -668,6 +681,7 @@ void osd_t::submit_primary_stab_subops(osd_op_t *cur_op)
                     .opcode = OSD_OP_SEC_STABILIZE,
                 },
                 .len = (uint64_t)(stab_osd.len * sizeof(obj_ver_id)),
+                .flags = cur_op->peer_fd == SELF_FD && cur_op->req.hdr.opcode != OSD_OP_SCRUB ? OSD_OP_RECOVERY_RELATED : 0,
             } };
             subops[i].iov.push_back(op_data->unstable_writes + stab_osd.start, stab_osd.len * sizeof(obj_ver_id));
             subops[i].callback = [cur_op, this](osd_op_t *subop)

src/osd_primary_write.cpp

@@ -292,16 +292,26 @@ resume_7:
     {
         {
             int recovery_type = op_data->object_state->state & (OBJ_DEGRADED|OBJ_INCOMPLETE) ? 0 : 1;
-            recovery_stat_count[0][recovery_type]++;
+            recovery_stat[recovery_type].count++;
-            if (!recovery_stat_count[0][recovery_type])
+            if (!recovery_stat[recovery_type].count) // wrapped
             {
-                recovery_stat_count[0][recovery_type]++;
+                memset(&recovery_print_prev[recovery_type], 0, sizeof(recovery_print_prev[recovery_type]));
-                recovery_stat_bytes[0][recovery_type] = 0;
+                memset(&recovery_stat[recovery_type], 0, sizeof(recovery_stat[recovery_type]));
+                recovery_stat[recovery_type].count++;
             }
             for (int role = 0; role < (op_data->scheme == POOL_SCHEME_REPLICATED ? 1 : pg.pg_size); role++)
             {
-                recovery_stat_bytes[0][recovery_type] += op_data->stripes[role].write_end - op_data->stripes[role].write_start;
+                recovery_stat[recovery_type].bytes += op_data->stripes[role].write_end - op_data->stripes[role].write_start;
             }
+            if (!cur_op->tv_end.tv_sec)
+            {
+                clock_gettime(CLOCK_REALTIME, &cur_op->tv_end);
+            }
+            uint64_t usec = (
+                (cur_op->tv_end.tv_sec - cur_op->tv_begin.tv_sec)*1000000 +
+                (cur_op->tv_end.tv_nsec - cur_op->tv_begin.tv_nsec)/1000
+            );
+            recovery_stat[recovery_type].usec += usec;
         }
         // Any kind of a non-clean object can have extra chunks, because we don't record objects
         // as degraded & misplaced or incomplete & misplaced at the same time. So try to remove extra chunks

src/osd_secondary.cpp

@@ -42,7 +42,21 @@ void osd_t::secondary_op_callback(osd_op_t *op)
     int retval = op->bs_op->retval;
     delete op->bs_op;
     op->bs_op = NULL;
-    finish_op(op, retval);
+    if (op->is_recovery_related() && recovery_target_sleep_us)
+    {
+        if (!op->tv_end.tv_sec)
+        {
+            clock_gettime(CLOCK_REALTIME, &op->tv_end);
+        }
+        tfd->set_timer_us(recovery_target_sleep_us, false, [this, op, retval](int timer_id)
+        {
+            finish_op(op, retval);
+        });
+    }
+    else
+    {
+        finish_op(op, retval);
+    }
 }
 
 void osd_t::exec_secondary(osd_op_t *cur_op)

src/qemu_driver.c

@@ -196,10 +196,11 @@ static void vitastor_parse_filename(const char *filename, QDict *options, Error
             !strcmp(name, "rdma-gid-index") ||
             !strcmp(name, "rdma-mtu"))
         {
-            unsigned long long num_val;
 #if QEMU_VERSION_MAJOR < 8 || QEMU_VERSION_MAJOR == 8 && QEMU_VERSION_MINOR < 1
+            unsigned long long num_val;
             if (parse_uint_full(value, &num_val, 0))
 #else
+            uint64_t num_val;
             if (parse_uint_full(value, 0, &num_val))
 #endif
             {

src/timerfd_manager.cpp

@@ -90,6 +90,12 @@ void timerfd_manager_t::clear_timer(int timer_id)
 
 void timerfd_manager_t::set_nearest()
 {
+    if (onstack > 0)
+    {
+        // Prevent re-entry
+        return;
+    }
+    onstack++;
 again:
     if (!timers.size())
     {
@@ -139,6 +145,7 @@ again:
         }
         wait_state = wait_state | 1;
     }
+    onstack--;
 }
 
 void timerfd_manager_t::handle_readable()

src/timerfd_manager.h

@@ -22,6 +22,7 @@ class timerfd_manager_t
     int timerfd;
     int nearest = -1;
     int id = 1;
+    int onstack = 0;
     std::vector<timerfd_timer_t> timers;
 
     void inc_timer(timerfd_timer_t & t);

src/vitastor.pc.in

@@ -6,7 +6,7 @@ includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@
 
 Name: Vitastor
 Description: Vitastor client library
-Version: 1.2.0
+Version: 1.3.1
 Libs: -L${libdir} -lvitastor_client
 Cflags: -I${includedir}
 

tests/run_3osds.sh

@@ -19,10 +19,10 @@ fi
 
 if [ "$IMMEDIATE_COMMIT" != "" ]; then
     NO_SAME="--journal_no_same_sector_overwrites true --journal_sector_buffer_count 1024 --disable_data_fsync 1 --immediate_commit all --log_level 10 --etcd_stats_interval 5"
-    $ETCDCTL put /vitastor/config/global '{"recovery_queue_depth":1,"osd_out_time":1,"immediate_commit":"all","client_enable_writeback":true}'
+    $ETCDCTL put /vitastor/config/global '{"recovery_queue_depth":1,"recovery_tune_util_low":1,"osd_out_time":1,"immediate_commit":"all","client_enable_writeback":true}'
 else
     NO_SAME="--journal_sector_buffer_count 1024 --log_level 10 --etcd_stats_interval 5"
-    $ETCDCTL put /vitastor/config/global '{"recovery_queue_depth":1,"osd_out_time":1,"client_enable_writeback":true}'
+    $ETCDCTL put /vitastor/config/global '{"recovery_queue_depth":1,"recovery_tune_util_low":1,"osd_out_time":1,"client_enable_writeback":true}'
 fi
 
 start_osd_on()
@@ -53,7 +53,7 @@ for i in $(seq 1 $OSD_COUNT); do
     start_osd $i
 done
 
-(while true; do node mon/mon-main.js --etcd_url $ETCD_URL --etcd_prefix "/vitastor" --verbose 1 || true; done) &>./testdata/mon.log &
+(while true; do node mon/mon-main.js --etcd_address $ETCD_URL --etcd_prefix "/vitastor" --verbose 1 || true; done) >>./testdata/mon.log 2>&1 &
 MON_PID=$!
 
 if [ "$SCHEME" = "ec" ]; then

tests/test_change_pg_count.sh

@@ -18,6 +18,7 @@ try_change()
     for i in {1..6}; do
         echo --- Change PG count to $n --- >>testdata/osd$i.log
     done
+    echo --- Change PG count to $n --- >>testdata/mon.log
 
     $ETCDCTL put /vitastor/config/pools '{"1":{'$POOLCFG',"pg_size":'$PG_SIZE',"pg_minsize":'$PG_MINSIZE',"pg_count":'$n'}}'
 

tests/test_failure_domain.sh

@@ -15,7 +15,7 @@ $ETCDCTL put /vitastor/osd/stats/7 '{"host":"host4","size":1073741824,"time":"'$
 $ETCDCTL put /vitastor/osd/stats/8 '{"host":"host4","size":1073741824,"time":"'$TIME'"}'
 $ETCDCTL put /vitastor/config/pools '{"1":{"name":"testpool","scheme":"replicated","pg_size":2,"pg_minsize":1,"pg_count":4,"failure_domain":"rack"}}'
 
-node mon/mon-main.js --etcd_url $ETCD_URL --etcd_prefix "/vitastor" &>./testdata/mon.log &
+node mon/mon-main.js --etcd_address $ETCD_URL --etcd_prefix "/vitastor" >>./testdata/mon.log 2>&1 &
 MON_PID=$!
 
 sleep 2