Update stock/hsx.vn.md

Đầu tư chứng cho mau giàu
Trộm tiếp
2026-07-08 14:20:19 +07:00 · 2026-07-08 14:20:00 +07:00 · 2026-07-08 13:53:49 +07:00 · 2026-07-08 13:53:01 +07:00 · 2026-07-05 14:09:57 +03:00 · 2026-07-04 21:40:29 +03:00
150 changed files with 6483 additions and 1856 deletions
@@ -306,6 +306,78 @@ jobs:
          echo ""
        done

+  test_dump_load:
+    runs-on: ubuntu-latest
+    needs: build
+    container: ${{env.TEST_IMAGE}}:${{github.sha}}
+    steps:
+    - name: Run test
+      id: test
+      timeout-minutes: 3
+      run: /root/vitastor/tests/test_dump_load.sh
+    - name: Print logs
+      if: always() && steps.test.outcome == 'failure'
+      run: |
+        for i in /root/vitastor/testdata/*.log /root/vitastor/testdata/*.txt; do
+          echo "-------- $i --------"
+          cat $i
+          echo ""
+        done
+
+  test_dump_load_32k:
+    runs-on: ubuntu-latest
+    needs: build
+    container: ${{env.TEST_IMAGE}}:${{github.sha}}
+    steps:
+    - name: Run test
+      id: test
+      timeout-minutes: 3
+      run: TEST_NAME=32k OSD_ARGS="--data_csum_type crc32c --csum_block_size 32k" OFFSET_ARGS="$OSD_ARGS" /root/vitastor/tests/test_dump_load.sh
+    - name: Print logs
+      if: always() && steps.test.outcome == 'failure'
+      run: |
+        for i in /root/vitastor/testdata/*.log /root/vitastor/testdata/*.txt; do
+          echo "-------- $i --------"
+          cat $i
+          echo ""
+        done
+
+  test_old_dump_load:
+    runs-on: ubuntu-latest
+    needs: build
+    container: ${{env.TEST_IMAGE}}:${{github.sha}}
+    steps:
+    - name: Run test
+      id: test
+      timeout-minutes: 3
+      run: OLD=1 /root/vitastor/tests/test_dump_load.sh
+    - name: Print logs
+      if: always() && steps.test.outcome == 'failure'
+      run: |
+        for i in /root/vitastor/testdata/*.log /root/vitastor/testdata/*.txt; do
+          echo "-------- $i --------"
+          cat $i
+          echo ""
+        done
+
+  test_dump_load_old_32k:
+    runs-on: ubuntu-latest
+    needs: build
+    container: ${{env.TEST_IMAGE}}:${{github.sha}}
+    steps:
+    - name: Run test
+      id: test
+      timeout-minutes: 3
+      run: TEST_NAME=old_32k OLD=1 OSD_ARGS="--data_csum_type crc32c --csum_block_size 32k" OFFSET_ARGS="$OSD_ARGS" /root/vitastor/tests/test_dump_load.sh
+    - name: Print logs
+      if: always() && steps.test.outcome == 'failure'
+      run: |
+        for i in /root/vitastor/testdata/*.log /root/vitastor/testdata/*.txt; do
+          echo "-------- $i --------"
+          cat $i
+          echo ""
+        done
+
  test_old_interrupted_rebalance:
    runs-on: ubuntu-latest
    needs: build
@@ -1458,6 +1530,24 @@ jobs:
          echo ""
        done

+  test_resize_last:
+    runs-on: ubuntu-latest
+    needs: build
+    container: ${{env.TEST_IMAGE}}:${{github.sha}}
+    steps:
+    - name: Run test
+      id: test
+      timeout-minutes: 3
+      run: /root/vitastor/tests/test_resize_last.sh
+    - name: Print logs
+      if: always() && steps.test.outcome == 'failure'
+      run: |
+        for i in /root/vitastor/testdata/*.log /root/vitastor/testdata/*.txt; do
+          echo "-------- $i --------"
+          cat $i
+          echo ""
+        done
+
  test_resize_auto:
    runs-on: ubuntu-latest
    needs: build
@@ -1494,6 +1584,24 @@ jobs:
          echo ""
        done

+  test_old_resize_last:
+    runs-on: ubuntu-latest
+    needs: build
+    container: ${{env.TEST_IMAGE}}:${{github.sha}}
+    steps:
+    - name: Run test
+      id: test
+      timeout-minutes: 3
+      run: OLD=1 /root/vitastor/tests/test_resize_last.sh
+    - name: Print logs
+      if: always() && steps.test.outcome == 'failure'
+      run: |
+        for i in /root/vitastor/testdata/*.log /root/vitastor/testdata/*.txt; do
+          echo "-------- $i --------"
+          cat $i
+          echo ""
+        done
+
  test_old_resize_auto:
    runs-on: ubuntu-latest
    needs: build
@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 2.8...3.30)

 project(vitastor)

-set(VITASTOR_VERSION "3.0.13")
+set(VITASTOR_VERSION "3.0.15")

 include(CTest)

@@ -1,112 +1,183 @@
-# Vitastor
+# tromcho.net

-[Читать на русском](README-ru.md)
+Repository này chứa toàn bộ source code của website **tromcho.net**.

-## The Idea
+## Giới thiệu

-Make Clustered Block Storage Fast Again.
+`tromcho.net` là mã nguồn website được tổ chức để phục vụ phát triển, triển khai và vận hành theo quy trình chuẩn trên GitHub.
+README này đóng vai trò tài liệu khởi đầu cho lập trình viên, DevOps engineer và cộng tác viên khi tiếp cận repository.

-Vitastor is a distributed block, file and object SDS, direct replacement of Ceph RBD, CephFS and RGW,
-and also internal SDS's of public clouds. However, in contrast to them, Vitastor is fast
-and simple at the same time. The only thing is it's slightly young :-).
+## Mục tiêu repository

-Vitastor is architecturally similar to Ceph which means strong consistency,
-primary-replication, symmetric clustering and automatic data distribution over any
-number of drives of any size with configurable redundancy (replication or erasure codes/XOR).
+- Quản lý tập trung toàn bộ source code của website.
+- Chuẩn hóa quy trình phát triển, review và triển khai.
+- Tạo nền tảng rõ ràng cho việc CI/CD, kiểm thử và vận hành production.
+- Hỗ trợ onboarding nhanh cho thành viên mới.

-Vitastor targets primarily SSD and SSD+HDD clusters with at least 10 Gbit/s network,
-supports TCP and RDMA and may achieve 4 KB read and write latency as low as ~0.1 ms
-with proper hardware which is ~10 times faster than other popular SDS's like Ceph
-or internal systems of public clouds.
+## Cấu trúc thư mục đề xuất

-Vitastor supports QEMU, UBLK, NBD, NFS protocols, OpenStack, OpenNebula, Proxmox, Kubernetes drivers.
-More drivers may be created easily.
+```text
+.
+├── app/                # Source code ứng dụng chính
+├── public/             # Static files, images, favicon, robots.txt
+├── config/             # Cấu hình môi trường, app, service integration
+├── database/           # Migration, seed, schema
+├── tests/              # Unit test, integration test, e2e test
+├── scripts/            # Script hỗ trợ build, deploy, backup, maintenance
+├── docs/               # Tài liệu kỹ thuật, kiến trúc, quy trình
+├── .github/            # GitHub Actions, issue template, PR template
+├── Dockerfile          # Build image ứng dụng
+├── docker-compose.yml  # Chạy local/dev bằng container
+├── .env.example        # Biến môi trường mẫu
+└── README.md
+```

-Read more details in the documentation. You can start from here: [Quick Start](docs/intro/quickstart.en.md).
+> Cấu trúc thực tế có thể thay đổi theo framework đang sử dụng.

-## Talks and presentations
+## Yêu cầu môi trường

- KuberConf'2025: [video](https://vitastor.io/presentation/kuberconf.webm)
- Highload'2025: [video](https://vitastor.io/presentation/hl2025/hl2025.webm),
-  [youtube](https://www.youtube.com/watch?v=0R8MLjFtz7g), presentation
-  ([in Russian](https://vitastor.io/presentation/hl2025/), [in English](https://vitastor.io/presentation/hl2025/en.html))
- Highload'2022: presentation ([in Russian](https://vitastor.io/presentation/highload/highload.html)),
-  [video](https://vitastor.io/presentation/highload/talk.webm)
- DevOpsConf'2021: presentation ([in Russian](https://vitastor.io/presentation/devopsconf/devopsconf.html),
-  [in English](https://vitastor.io/presentation/devopsconf/devopsconf_en.html)),
-  [video](https://vitastor.io/presentation/devopsconf/talk.webm)
+Tùy theo stack công nghệ của website, môi trường phát triển nên có:

-## Documentation
+- Git
+- Docker và Docker Compose
+- Node.js / PHP / Python / runtime phù hợp với dự án
+- Make (khuyến nghị)
+- Truy cập vào file cấu hình môi trường `.env`

- Introduction
-  - [Quick Start](docs/intro/quickstart.en.md)
-  - [Features](docs/intro/features.en.md)
-  - [Architecture](docs/intro/architecture.en.md)
-  - [Author and license](docs/intro/author.en.md)
- Installation
-  - [Packages](docs/installation/packages.en.md)
-  - [Docker](docs/installation/docker.en.md)
-  - [Proxmox](docs/installation/proxmox.en.md)
-  - [OpenNebula](docs/installation/opennebula.en.md)
-  - [OpenStack](docs/installation/openstack.en.md)
-  - [Kubernetes CSI](docs/installation/kubernetes.en.md)
-  - [S3](docs/installation/s3.en.md)
-  - [Building from Source](docs/installation/source.en.md)
- Configuration
-  - [Overview](docs/config.en.md)
-  - Parameter Reference
-    - [Common](docs/config/common.en.md)
-    - [Network](docs/config/network.en.md)
-    - [Client](docs/config/client.en.md)
-    - [Global Disk Layout](docs/config/layout-cluster.en.md)
-    - [OSD Disk Layout](docs/config/layout-osd.en.md)
-    - [OSD Runtime Parameters](docs/config/osd.en.md)
-    - [Monitor](docs/config/monitor.en.md)
-  - [Pool configuration](docs/config/pool.en.md)
-  - [Image metadata in etcd](docs/config/inode.en.md)
- Usage
-  - [vitastor-cli](docs/usage/cli.en.md) (command-line interface)
-  - [vitastor-disk](docs/usage/disk.en.md) (disk management tool)
-  - [fio](docs/usage/fio.en.md) for benchmarks
-  - [UBLK](docs/usage/ublk.en.md) for kernel mounts
-  - [NBD](docs/usage/nbd.en.md) - old interface for kernel mounts
-  - [QEMU, qemu-img and VDUSE](docs/usage/qemu.en.md)
-  - [NFS](docs/usage/nfs.en.md) clustered file system and pseudo-FS proxy
-  - [Administration](docs/usage/admin.en.md)
- Performance
-  - [Understanding storage performance](docs/performance/understanding.en.md)
-  - [Theoretical performance](docs/performance/theoretical.en.md)
-  - [Example comparison with Ceph](docs/performance/comparison1.en.md)
-  - [Newer benchmark of Vitastor 1.3.1](docs/performance/bench2.en.md)
+## Bắt đầu nhanh

-## Author and License
+### 1. Clone repository

-Copyright (c) Vitaliy Filippov (vitalif [at] yourcmc.ru), 2019+
+```bash
+git clone https://github.com/<your-org>/tromcho.net.git
+cd tromcho.net
+```

-Join Vitastor Telegram Chat: https://t.me/vitastor
+### 2. Tạo file môi trường

-All server-side code (OSD, Monitor and so on) is licensed under the terms of
-Vitastor Network Public License 1.1 (VNPL 1.1), a copyleft license based on
-GNU GPLv3.0 with the additional "Network Interaction" clause which requires
-opensourcing all programs directly or indirectly interacting with Vitastor
-through a computer network and expressly designed to be used in conjunction
-with it ("Proxy Programs"). Proxy Programs may be made public not only under
-the terms of the same license, but also under the terms of any GPL-Compatible
-Free Software License, as listed by the Free Software Foundation.
-This is a stricter copyleft license than the Affero GPL.
+```bash
+cp .env.example .env
+```

-Please note that VNPL doesn't require you to open the code of proprietary
-software running inside a VM if it's not specially designed to be used with
-Vitastor.
+Sau đó cập nhật các biến cấu hình cần thiết trong file `.env`.

-Basically, you can't use the software in a proprietary environment to provide
-its functionality to users without opensourcing all intermediary components
-standing between the user and Vitastor or purchasing a commercial license
-from the author 😀.
+### 3. Chạy môi trường local

-Client libraries (cluster_client and so on) are dual-licensed under the same
-VNPL 1.1 and also GNU GPL 2.0 or later to allow for compatibility with GPLed
-software like QEMU and fio.
+Nếu dự án dùng Docker:

-You can find the full text of VNPL-1.1 in the file [VNPL-1.1.txt](VNPL-1.1.txt).
-GPL 2.0 is also included in this repository as [GPL-2.0.txt](GPL-2.0.txt).
+```bash
+docker compose up -d --build
+```
+
+Nếu dự án chạy trực tiếp theo framework, sử dụng lệnh tương ứng của stack hiện tại.
+
+## Quy trình phát triển
+
+- Tạo branch mới từ `main` hoặc `develop`.
+- Đặt tên branch rõ ràng, ví dụ: `feature/homepage-banner`, `fix/login-timeout`.
+- Commit ngắn gọn, đúng ngữ cảnh thay đổi.
+- Tạo Pull Request để review trước khi merge.
+- Không commit file bí mật như `.env`, private key hoặc credential.
+
+## Quy ước commit
+
+Khuyến nghị dùng convention sau:
+
+```text
+feat: thêm chức năng mới
+fix: sửa lỗi
+refactor: tái cấu trúc mã nguồn
+chore: cập nhật tác vụ phụ trợ
+ci: thay đổi pipeline CI/CD
+docs: cập nhật tài liệu
+test: bổ sung hoặc cập nhật kiểm thử
+```
+
+## CI/CD
+
+Repository nên tích hợp các bước tự động sau:
+
+- Lint source code
+- Chạy unit test / integration test
+- Build artifact hoặc Docker image
+- Scan bảo mật dependency/container
+- Deploy tới staging hoặc production theo rule xác định
+
+Ví dụ vị trí cấu hình pipeline:
+
+```text
+.github/workflows/
+```
+
+## Biến môi trường
+
+Không commit file `.env` thật lên GitHub.
+Nên cung cấp `.env.example` với:
+
+- Danh sách biến bắt buộc
+- Giá trị mẫu an toàn
+- Ghi chú ngắn cho từng biến quan trọng
+
+Ví dụ:
+
+```env
+APP_ENV=local
+APP_DEBUG=true
+APP_URL=http://localhost
+DB_HOST=127.0.0.1
+DB_PORT=3306
+DB_NAME=tromcho
+DB_USER=user
+DB_PASSWORD=change_me
+```
+
+## Triển khai
+
+Khuyến nghị tách rõ các môi trường:
+
+- local
+- development
+- staging
+- production
+
+Các thành phần nên được chuẩn hóa khi triển khai:
+
+- Biến môi trường
+- Reverse proxy / web server
+- TLS certificate
+- Database migration
+- Backup strategy
+- Log rotation và monitoring
+
+## Bảo mật
+
+- Không đưa secrets vào source code.
+- Bật branch protection cho nhánh quan trọng.
+- Review dependency định kỳ.
+- Áp dụng nguyên tắc least privilege cho tài khoản deploy.
+- Theo dõi log, audit và cảnh báo bất thường.
+
+## Đóng góp
+
+Khi đóng góp vào repository:
+
+1. Fork hoặc tạo branch làm việc.
+2. Cập nhật mã nguồn theo phạm vi thay đổi.
+3. Kiểm tra local trước khi tạo Pull Request.
+4. Viết mô tả PR rõ ràng: mục tiêu, phạm vi ảnh hưởng, cách kiểm thử.
+
+## Tài liệu nên bổ sung
+
+Repository này nên có thêm các tài liệu sau trong thư mục `docs/`:
+
+- Kiến trúc hệ thống
+- Sơ đồ database
+- Luồng deploy
+- Quy trình backup/restore
+- Hướng dẫn xử lý sự cố
+- Checklist release
+
+## License
+
+Copyright 2026 Trộm Chó chấm Nét
+---
@@ -1,4 +1,4 @@
-VITASTOR_VERSION ?= v3.0.13
+VITASTOR_VERSION ?= v3.0.15

 all: build push

@@ -49,7 +49,7 @@ spec:
            capabilities:
              add: ["SYS_ADMIN"]
            allowPrivilegeEscalation: true
-          image: vitalif/vitastor-csi:v3.0.13
+          image: vitalif/vitastor-csi:v3.0.15
          args:
            - "--node=$(NODE_ID)"
            - "--endpoint=$(CSI_ENDPOINT)"
@@ -121,7 +121,7 @@ spec:
            privileged: true
            capabilities:
              add: ["SYS_ADMIN"]
-          image: vitalif/vitastor-csi:v3.0.13
+          image: vitalif/vitastor-csi:v3.0.15
          args:
            - "--node=$(NODE_ID)"
            - "--endpoint=$(CSI_ENDPOINT)"
@@ -5,7 +5,7 @@ package vitastor

 const (
    vitastorCSIDriverName    = "csi.vitastor.io"
-    vitastorCSIDriverVersion = "3.0.13"
+    vitastorCSIDriverVersion = "3.0.15"
 )

 // Config struct fills the parameters of request or user input
@@ -1,4 +1,4 @@
-vitastor (3.0.13-1) unstable; urgency=medium
+vitastor (3.0.15-1) unstable; urgency=medium

  * Bugfixes

@@ -11,6 +11,7 @@ override_dh_install:
 	cp -v node-binding/package.json node-binding/index.js node-binding/addon.cc node-binding/addon.h node-binding/client.cc node-binding/client.h debian/tmp/usr/lib/x86_64-linux-gnu/nodejs/vitastor
 	cp -v node-binding/build/Release/addon.node debian/tmp/usr/lib/x86_64-linux-gnu/nodejs/vitastor/build/Release
 	dh_install
+	cd debian/vitastor-mon/usr/lib/vitastor/mon && npm install --production

 override_dh_installdeb:
 	cat debian/fio_version >> debian/vitastor-fio.substvars
@@ -37,12 +37,6 @@ rm -rf a b

 echo "dep:fio=$FIO" > debian/fio_version

-cd /root/vitastor/packages/vitastor-$REL/vitastor-$VER
-mkdir mon/node_modules
-cd mon/node_modules
-curl -s https://git.yourcmc.ru/vitalif/antietcd/archive/master.tar.gz | tar -zx
-curl -s https://git.yourcmc.ru/vitalif/tinyraft/archive/master.tar.gz | tar -zx
-
 cd /root/vitastor/packages/vitastor-$REL
 if [[ ( "$REL" = "trixie" || "$REL" = "resolute" ) && -e ../vitastor-bookworm/vitastor_$VER.orig.tar.xz ]]; then
    # Fucking shit, archives differ between bookworm (xz 5.4.1) and trixie (xz 5.8.1)
@@ -1,4 +1,4 @@
-VITASTOR_VERSION ?= v3.0.13
+VITASTOR_VERSION ?= v3.0.15

 all: build push

@@ -4,7 +4,7 @@
 #

 # Desired Vitastor version
-VITASTOR_VERSION=v3.0.13
+VITASTOR_VERSION=v3.0.15

 # Additional arguments for all containers
 # For example, you may want to specify a custom logging driver here
@@ -26,9 +26,9 @@ at Vitastor Kubernetes operator: https://github.com/Antilles7227/vitastor-operat
 The instruction is very simple.

 1. Download a Docker image of the desired version: \
-   `docker pull vitalif/vitastor:v3.0.13`
+   `docker pull vitalif/vitastor:v3.0.15`
 2. Install scripts to the host system: \
-   `docker run --rm -it -v /etc:/host-etc -v /usr/bin:/host-bin vitalif/vitastor:v3.0.13 install.sh`
+   `docker run --rm -it -v /etc:/host-etc -v /usr/bin:/host-bin vitalif/vitastor:v3.0.15 install.sh`
 3. Reload udev rules: \
   `udevadm control --reload-rules`
 4. Enable the vitastor-host service: \
@@ -25,9 +25,9 @@ Vitastor можно установить в Docker/Podman. При этом etcd,
 Инструкция по установке максимально простая.

 1. Скачайте Docker-образ желаемой версии: \
-   `docker pull vitalif/vitastor:v3.0.13`
+   `docker pull vitalif/vitastor:v3.0.15`
 2. Установите скрипты в хост-систему командой: \
-   `docker run --rm -it -v /etc:/host-etc -v /usr/bin:/host-bin vitalif/vitastor:v3.0.13 install.sh`
+   `docker run --rm -it -v /etc:/host-etc -v /usr/bin:/host-bin vitalif/vitastor:v3.0.15 install.sh`
 3. Перезагрузите правила udev: \
   `udevadm control --reload-rules`
 4. Включите сервис vitastor-host: \
@@ -18,7 +18,7 @@ class AntiEtcdAdapter
                cluster = cluster ? (''+(cluster||'')).split(/,+/) : [];
            cluster = Object.keys(cluster.reduce((a, url) =>
            {
-                a[url.toLowerCase().replace(/^(https?:\/\/)/, '').replace(/\/.*$/, '')] = true;
+                a[url.toLowerCase().replace(/^(https?:\/\/)?(.*?)(\/.*)?$/, (m, m1, m2) => (m1||'http://')+m2)] = true;
                return a;
            }, {}));
            const cfg_port = config.antietcd_port;
@@ -26,7 +26,18 @@ class AntiEtcdAdapter
            is_local['0.0.0.0'] = true;
            is_local['::'] = true;
            is_local[''] = true;
-            const selected = cluster.map(s => s.split(':', 2)).filter(ip => is_local[ip[0]] && (!cfg_port || ip[1] == cfg_port));
+            // split :, 3 -> <schema>:<//ip>:<port>
+            const selected = [];
+            for (let i = 0; i < cluster.length; i++)
+            {
+                const m = /^(https?:\/\/)?(?:\[(.*)\]|([^\[\:]+))(?::(\d+))?$/.exec(cluster[i]);
+                if (!m)
+                    continue;
+                const ip = m[3] || m[2];
+                const port = m[4] || 2379;
+                if (is_local[ip] && (!cfg_port || port == cfg_port))
+                    selected.push({ idx: i, ip, port });
+            }
            if (selected.length > 1)
            {
                console.error('More than 1 etcd_address matches local IPs, please specify port');
@@ -35,15 +46,16 @@ class AntiEtcdAdapter
            else if (selected.length == 1)
            {
                const antietcd_config = {
-                    ip: selected[0][0],
-                    port: selected[0][1],
-                    data: config.antietcd_data_file || ((config.antietcd_data_dir || '/var/lib/vitastor') + '/mon_'+selected[0][1]+'.json.gz'),
+                    ip: selected[0].ip,
+                    port: selected[0].port,
+                    data: config.antietcd_data_file || ((config.antietcd_data_dir || '/var/lib/vitastor') + '/mon_'+selected[0].port+'.json.gz'),
                    persist_filter: vitastor_persist_filter({ vitastor_prefix: config.etcd_prefix || '/vitastor' }),
-                    node_id: selected[0][0]+':'+selected[0][1], // node_id = ip:port
-                    cluster: (cluster.length == 1 ? null : cluster.reduce((a, c) => { a[c] = "http://"+c; return a; }, {})),
+                    node_id: cluster[selected[0].idx].replace(/^(https?:\/\/)/, ''), // same as in <cluster> below
+                    cluster: (cluster.length == 1 ? null : cluster.reduce((a, c) => { a[c.replace(/^(https?:\/\/)/, '')] = c; return a; }, {})),
                    cluster_key: (config.etcd_prefix || '/vitastor'),
                    stale_read: 1,
                    log_level: 1,
+                    logs: { cluster: true },
                };
                for (const key in config)
                {
@@ -1,6 +1,6 @@
 {
  "name": "vitastor-mon",
-  "version": "3.0.13",
+  "version": "3.0.15",
  "description": "Vitastor SDS monitor service",
  "main": "mon-main.js",
  "scripts": {
@@ -9,7 +9,7 @@
  "author": "Vitaliy Filippov",
  "license": "UNLICENSED",
  "dependencies": {
-    "antietcd": "^1.2.4",
+    "antietcd": "^1.3.1",
    "sprintf-js": "^1.1.2",
    "ws": "^7.2.5"
  },
@@ -1,6 +1,6 @@
 {
  "name": "vitastor",
-  "version": "3.0.13",
+  "version": "3.0.15",
  "description": "Low-level native bindings to Vitastor client library",
  "main": "index.js",
  "keywords": [
@@ -366,15 +366,38 @@ sub map_volume
    my $prefix = defined $scfg->{vitastor_prefix} ? $scfg->{vitastor_prefix} : 'pve/';

    my ($vtype, $img_name, $vmid) = $class->parse_volname($volname);
-    my $name = $img_name;
+    my $name = $prefix.$img_name;
    $name .= '@'.$snapname if $snapname;

    my $mapped = run_cli($scfg, [ 'ls' ], binary => '/usr/bin/vitastor-nbd');
-    my ($kerneldev) = grep { $mapped->{$_}->{image} eq $prefix.$name } keys %$mapped;
-    return $kerneldev if $kerneldev && -b $kerneldev; # already mapped
+    my ($kerneldev) = grep {
+        $mapped->{$_} && $mapped->{$_}->{image} && $mapped->{$_}->{image} eq $name
+    } keys %$mapped;

-    $kerneldev = run_cli($scfg, [ 'map', '--image', $prefix.$name ], binary => '/usr/bin/vitastor-nbd', json => 0);
-    return $kerneldev;
+    if ($kerneldev && -b $kerneldev)
+    {
+        my $size = `/usr/sbin/blockdev --getsize64 $kerneldev`;
+        return $kerneldev if $size && $size > 0;
+    }
+
+    my $map_out = run_cli($scfg, [ 'map', '--image', $name ], binary => '/usr/bin/vitastor-nbd', json => 0);
+    $map_out =~ s/^\s+|\s+$//gso;
+
+    # Wait until the device is started
+    for (my $i = 0; $i < 100; $i++)
+    {
+        $mapped = run_cli($scfg, [ 'ls' ], binary => '/usr/bin/vitastor-nbd');
+        ($kerneldev) = grep { $mapped->{$_} && $mapped->{$_}->{image} && $mapped->{$_}->{image} eq $name } keys %$mapped;
+        if ($kerneldev && -b $kerneldev)
+        {
+            my $size = `/usr/sbin/blockdev --getsize64 $kerneldev`;
+            return $kerneldev if $size && $size > 0;
+        }
+        select(undef, undef, undef, 0.1);
+    }
+
+    die "Failed to map Vitastor image $name via NBD".
+        ($map_out ? ", vitastor-nbd map returned '$map_out'" : "")."\n";
 }

 sub unmap_volume
@@ -383,13 +406,19 @@ sub unmap_volume
    my $prefix = defined $scfg->{vitastor_prefix} ? $scfg->{vitastor_prefix} : 'pve/';

    my ($vtype, $name, $vmid) = $class->parse_volname($volname);
+    $name = $prefix.$name;
    $name .= '@'.$snapname if $snapname;
-
    my $mapped = run_cli($scfg, [ 'ls' ], binary => '/usr/bin/vitastor-nbd');
-    my ($kerneldev) = grep { $mapped->{$_}->{image} eq $prefix.$name } keys %$mapped;
-    if ($kerneldev && -b $kerneldev)
+
+    my @kerneldevs = grep {
+        $mapped->{$_} && $mapped->{$_}->{image} && $mapped->{$_}->{image} eq $name
+    } keys %$mapped;
+
+    for my $kerneldev (@kerneldevs)
    {
-        run_cli($scfg, [ 'unmap', $kerneldev ], binary => '/usr/bin/vitastor-nbd', json => 0);
+        next if !$kerneldev || !-b $kerneldev;
+        eval { run_cli($scfg, [ 'unmap', $kerneldev ], binary => '/usr/bin/vitastor-nbd', json => 0); };
+        warn "Failed to unmap Vitastor image $name from $kerneldev: $@" if $@;
    }

    return 1;
@@ -405,7 +434,13 @@ sub activate_volume
 sub deactivate_volume
 {
    my ($class, $storeid, $scfg, $volname, $snapname, $cache) = @_;
-    $class->unmap_volume($storeid, $scfg, $volname, $snapname) if $scfg->{vitastor_nbd};
+
+    # Even with vitastor_nbd=0, Proxmox may call map_volume() for special
+    # volumes like tpmstate0 because swtpm needs a local file/block path.
+    # Therefore, always try to unmap an existing NBD mapping here.
+    # unmap_volume() is a no-op if the volume is not currently mapped.
+    $class->unmap_volume($storeid, $scfg, $volname, $snapname);
+
    return 1;
 }

@@ -50,7 +50,7 @@ from cinder.volume import configuration
 from cinder.volume import driver
 from cinder.volume import volume_utils

-VITASTOR_VERSION = '3.0.13'
+VITASTOR_VERSION = '3.0.15'

 LOG = logging.getLogger(__name__)

@@ -1,11 +1,11 @@
 Name:           vitastor
-Version:        3.0.13
+Version:        3.0.15
 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-3.0.13.el10.tar.gz
+Source0:        vitastor-3.0.15.el10.tar.gz

 BuildRequires:  gperftools-devel
 BuildRequires:  gcc-c++
@@ -1,11 +1,11 @@
 Name:           vitastor
-Version:        3.0.13
+Version:        3.0.15
 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-3.0.13.el7.tar.gz
+Source0:        vitastor-3.0.15.el7.tar.gz

 BuildRequires:  gperftools-devel
 BuildRequires:  devtoolset-9-gcc-c++
@@ -1,11 +1,11 @@
 Name:           vitastor
-Version:        3.0.13
+Version:        3.0.15
 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-3.0.13.el8.tar.gz
+Source0:        vitastor-3.0.15.el8.tar.gz

 BuildRequires:  gperftools-devel
 BuildRequires:  gcc-toolset-9-gcc-c++
@@ -1,11 +1,11 @@
 Name:           vitastor
-Version:        3.0.13
+Version:        3.0.15
 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-3.0.13.el9.tar.gz
+Source0:        vitastor-3.0.15.el9.tar.gz

 BuildRequires:  gperftools-devel
 BuildRequires:  gcc-c++
@@ -20,7 +20,7 @@ if("${CMAKE_INSTALL_PREFIX}" MATCHES "^/usr/local/?$")
 endif()
 set(ENABLE_COVERAGE false CACHE BOOL "Enable code coverage")

-add_definitions(-DVITASTOR_VERSION="3.0.13")
+add_definitions(-DVITASTOR_VERSION="3.0.15")
 add_definitions(-D_GNU_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Wall -Wno-sign-compare -Wno-comment -Wno-parentheses -Wno-pointer-arith -fdiagnostics-color=always -fno-omit-frame-pointer -fvisibility=hidden -I ${CMAKE_SOURCE_DIR}/src)
 add_link_options(-fno-omit-frame-pointer)
 if (${WITH_ASAN})
@@ -541,17 +541,21 @@ int blockstore_disk_t::trim_data(std::function<bool(uint64_t)> is_used)
                    if (range[0] % discard_granularity)
                        range[0] = range[0] + discard_granularity - (range[0] % discard_granularity);
                    if (range[0] >= range[1])
-                        continue;
-                    range[1] -= range[0];
+                        range[1] = 0;
+                    else
+                        range[1] -= range[0];
                }
-                r = ioctl(data_fd, BLKDISCARD, &range);
-                if (r != 0)
+                if (range[1] > 0)
                {
-                    fprintf(stderr, "Failed to execute BLKDISCARD %ju+%ju on %s: %s (code %d)\n",
-                        range[0], range[1], data_device.c_str(), strerror(-r), r);
-                    return -errno;
+                    r = ioctl(data_fd, BLKDISCARD, &range);
+                    if (r != 0)
+                    {
+                        fprintf(stderr, "Failed to execute BLKDISCARD %ju+%ju on %s: %s (code %d)\n",
+                            range[0], range[1], data_device.c_str(), strerror(-r), r);
+                        return -errno;
+                    }
+                    discarded += range[1];
                }
-                discarded += range[1];
            }
            j = i+1;
        }
@@ -22,7 +22,7 @@

 #define HEAP_INFLIGHT_DONE 1
 #define HEAP_INFLIGHT_COMPACTABLE 2
-#define HEAP_INFLIGHT_COMPACTED 4
+#define HEAP_INFLIGHT_OVERWRITE 4
 #define HEAP_INFLIGHT_GC 8
 #define HEAP_INFLIGHT_EXPLICIT 16

@@ -122,6 +122,8 @@ uint32_t heap_entry_t::get_size(blockstore_heap_t *heap)
    }
    if (type() == BS_HEAP_SMALL_WRITE || type() == BS_HEAP_INTENT_WRITE)
    {
+        if (size < sizeof(heap_small_write_t))
+            return heap->get_small_entry_size(0, 0);
        return heap->get_small_entry_size(small().offset, small().len);
    }
    return heap->get_simple_entry_size();
@@ -364,14 +366,11 @@ corrupted_object:
                    return EDOM;
                }
            }
-            if (((wr->entry_type & BS_HEAP_TYPE) == BS_HEAP_SMALL_WRITE ||
-                (wr->entry_type & BS_HEAP_TYPE) == BS_HEAP_INTENT_WRITE) &&
-                wr->size < sizeof(heap_small_write_t))
+            if (wr->size != wr->get_size(this))
            {
-                // Small writes require accessing offset & len to calculate correct length,
-                // so require at least sizeof(heap_small_write_t) for them
-                fprintf(stderr, "Error: entry %jx:%jx v%ju has invalid size in metadata block %u at %u (%u < min %zu bytes)\n",
-                    wr->inode, wr->stripe, wr->version, block_num, block_offset, wr->size, sizeof(heap_small_write_t));
+                // Check entry size
+                fprintf(stderr, "Error: entry %jx:%jx v%ju has invalid size in metadata block %u at %u (%u != %u bytes)\n",
+                    wr->inode, wr->stripe, wr->version, block_num, block_offset, wr->size, wr->get_size(this));
                goto corrupted_object;
            }
            if (wr->entry_type == BS_HEAP_COMMIT && !wr->version)
@@ -683,10 +682,14 @@ int blockstore_heap_t::mark_used_blocks()
                        }
                        use_data(wr->inode, wr->big_location(this));
                    }
-                    if (wr->is_compactable() && !added)
+                    if (wr->is_compactable())
                    {
-                        compact_queue.push_back((object_id){ .inode = wr->inode, .stripe = wr->stripe });
-                        added = true;
+                        to_compact_count++;
+                        if (!added)
+                        {
+                            compact_queue.push_back((object_id){ .inode = wr->inode, .stripe = wr->stripe });
+                            added = true;
+                        }
                    }
                    if (wr->is_overwrite())
                    {
@@ -696,6 +699,11 @@ int blockstore_heap_t::mark_used_blocks()
            });
        }
    }
+    for (auto li: init_erase_items)
+    {
+        unlink_list_item(li);
+    }
+    init_erase_items.clear();
    if (dsk->gc_on_start)
    {
        recheck_full_gc();
@@ -731,7 +739,6 @@ void blockstore_heap_t::init_erase_bad_entry(heap_list_item_t *li)
        inf.garbage_space -= (li->entry.is_garbage() ? li->entry.size : 0);
    });
    recheck_modified_blocks.insert(li->block_num);
-    unlink_list_item(li);
 }

 bool blockstore_heap_t::init_erase_double_claim(heap_list_item_t *prev_li, heap_list_item_t *cur_li)
@@ -786,6 +793,8 @@ bool blockstore_heap_t::init_erase_double_claim(heap_list_item_t *prev_li, heap_
                overwritten = erase_li->entry.is_overwrite();
            }
            init_erase_bad_entry(erase_li);
+            // Can't erase (mutate map) while iterating, so postpone it
+            init_erase_items.push_back(erase_li);
            erase_li = prev_erase_li;
        }
    }
@@ -799,6 +808,8 @@ bool blockstore_heap_t::init_erase_double_claim(heap_list_item_t *prev_li, heap_
            auto next_erase_li = erase_li->next;
            init_free_bad_entry(&erase_li->entry);
            init_erase_bad_entry(erase_li);
+            // Can't erase (mutate map) while iterating, so postpone it
+            init_erase_items.push_back(erase_li);
            erase_li = next_erase_li;
        }
        erase_li = cur_li;
@@ -807,6 +818,8 @@ bool blockstore_heap_t::init_erase_double_claim(heap_list_item_t *prev_li, heap_
        {
            auto prev_erase_li = erase_li->prev;
            init_erase_bad_entry(erase_li);
+            // Can't erase (mutate map) while iterating, so postpone it
+            init_erase_items.push_back(erase_li);
            erase_li = prev_erase_li;
        }
    }
@@ -877,6 +890,7 @@ void blockstore_heap_t::recheck_drop_entries(heap_entry_t *obj, heap_entry_t *ba
        auto prev = li->prev;
        assert(li->entry.type() == bad_wr->type());
        init_erase_bad_entry(li);
+        unlink_list_item(li);
        li = prev;
    }
 }
@@ -1139,7 +1153,7 @@ bool blockstore_heap_t::calc_block_checksums(uint32_t *block_csums, uint8_t *bit
                while (pos < end && pos < block_end && !(bitmap[pos/dsk->bitmap_granularity/8] & (1 << ((pos/dsk->bitmap_granularity) % 8))))
                    pos += dsk->bitmap_granularity;
                // zero padding at the beginning or at the end of the block is not counted
-                if (pos > prev && prev > 0 && pos < block_end)
+                if (pos > prev && prev > blk_start && pos < block_end)
                    block_crc = crc32c_pad(block_crc, NULL, 0, pos-prev, 0);
                prev = pos;
                while (pos < end && pos < block_end && (bitmap[pos/dsk->bitmap_granularity/8] & (1 << ((pos/dsk->bitmap_granularity) % 8))))
@@ -1537,7 +1551,7 @@ int blockstore_heap_t::add_entry(uint32_t wr_size, uint32_t *modified_block,
    // Remember the object as dirty and remove older entries when this block is written and fsynced
    push_inflight_lsn(next_lsn, new_wr,
        (explicit_complete ? HEAP_INFLIGHT_EXPLICIT : 0) |
-        (new_wr->is_overwrite() ? HEAP_INFLIGHT_COMPACTED : 0) |
+        (new_wr->is_overwrite() ? HEAP_INFLIGHT_OVERWRITE : 0) |
        (new_wr->is_compactable() ? HEAP_INFLIGHT_COMPACTABLE : 0));
    insert_list_items(&li, 1, false);
    li->block_num = block_num;
@@ -1571,10 +1585,22 @@ int blockstore_heap_t::add_small_write(object_id oid, heap_entry_t **obj_ptr, ui
        wr->small().location = location;
        if (bitmap)
            memcpy(wr->get_ext_bitmap(this), bitmap, dsk->clean_entry_bitmap_size);
-        else if (obj)
-            memcpy(wr->get_ext_bitmap(this), obj->get_ext_bitmap(this), dsk->clean_entry_bitmap_size);
        else
-            memset(wr->get_ext_bitmap(this), 0, dsk->clean_entry_bitmap_size);
+        {
+            bool found = false;
+            iterate_with_stable(obj, UINT64_MAX, [&](heap_entry_t *old_wr, bool stable)
+            {
+                if (old_wr->get_ext_bitmap(this))
+                {
+                    found = true;
+                    memcpy(wr->get_ext_bitmap(this), old_wr->get_ext_bitmap(this), dsk->clean_entry_bitmap_size);
+                    return false;
+                }
+                return true;
+            });
+            if (!found)
+                memset(wr->get_ext_bitmap(this), 0, dsk->clean_entry_bitmap_size);
+        }
        calc_checksums(wr, (uint8_t*)data, true);
        *obj_ptr = wr;
    });
@@ -2274,7 +2300,7 @@ void blockstore_heap_t::use_data(inode_t inode, uint64_t location)
 {
    auto sh_it = pool_shard_settings.find(INODE_POOL(inode));
    if (sh_it != pool_shard_settings.end() && sh_it->second.no_inode_stats)
-        inode = (INODE_POOL(inode) << POOL_ID_BITS);
+        inode = INODE_WITH_POOL(INODE_POOL(inode), 0);
    assert(!data_alloc->get(location / dsk->data_block_size));
    data_alloc->set(location / dsk->data_block_size, true);
    inode_space_stats[inode] += dsk->data_block_size;
@@ -2285,7 +2311,7 @@ void blockstore_heap_t::free_data(inode_t inode, uint64_t location)
 {
    auto sh_it = pool_shard_settings.find(INODE_POOL(inode));
    if (sh_it != pool_shard_settings.end() && sh_it->second.no_inode_stats)
-        inode = (INODE_POOL(inode) << POOL_ID_BITS);
+        inode = INODE_WITH_POOL(INODE_POOL(inode), 0);
    assert(data_alloc->get(location / dsk->data_block_size));
    data_alloc->set(location / dsk->data_block_size, false);
    auto sp_it = inode_space_stats.find(inode);
@@ -2322,7 +2348,8 @@ void blockstore_heap_t::use_buffer_area(inode_t inode, uint64_t location, uint64
        return;
    }
    assert(!(size % dsk->bitmap_granularity));
-    buffer_alloc->use(location / dsk->bitmap_granularity, size / dsk->bitmap_granularity);
+    bool ok = buffer_alloc->use(location / dsk->bitmap_granularity, size / dsk->bitmap_granularity);
+    assert(ok);
    buffer_area_used_space += size;
 }

@@ -2364,7 +2391,7 @@ void blockstore_heap_t::get_meta_block(uint32_t block_num, uint8_t *buffer)
    }
 }

-void blockstore_heap_t::fill_block_empty_space(uint8_t *buffer, uint32_t pos)
+void blockstore_heap_t::fill_block_empty_space(uint8_t *buffer, uint64_t pos)
 {
    if (pos > dsk->meta_block_size)
    {
@@ -2452,7 +2479,7 @@ uint64_t blockstore_heap_t::get_garbage_memory()
 void blockstore_heap_t::push_inflight_lsn(uint64_t lsn, heap_entry_t *wr, uint64_t flags)
 {
    uint64_t next_inf = first_inflight_lsn + inflight_lsn.size();
-    if (flags & (HEAP_INFLIGHT_COMPACTABLE|HEAP_INFLIGHT_COMPACTED))
+    if (flags & (HEAP_INFLIGHT_COMPACTABLE|HEAP_INFLIGHT_OVERWRITE))
    {
        to_compact_count++;
    }
@@ -2519,7 +2546,7 @@ void blockstore_heap_t::mark_lsn_fsynced(uint64_t lsn)
 void blockstore_heap_t::apply_inflight(heap_inflight_lsn_t & inflight)
 {
    auto wr = inflight.wr;
-    if (inflight.flags & HEAP_INFLIGHT_COMPACTED)
+    if (inflight.flags & HEAP_INFLIGHT_OVERWRITE)
    {
        // Mark previous entries as garbage, sequentially
        mark_garbage_up_to(wr);
@@ -219,6 +219,7 @@ class blockstore_heap_t
    bool marked_used_blocks = false;
    bool recheck_queue_filled = false;
    std::vector<heap_list_item_t*> postponed_items;
+    std::vector<heap_list_item_t*> init_erase_items;
    std::set<uint32_t> recheck_modified_blocks;
    std::deque<heap_entry_t*> recheck_queue;
    std::map<heap_entry_t*, heap_recheck_state_t> recheck_states;
@@ -361,7 +362,7 @@ public:

    // get metadata block data buffer and used space
    void get_meta_block(uint32_t block_num, uint8_t *buffer);
-    void fill_block_empty_space(uint8_t *buffer, uint32_t pos);
+    void fill_block_empty_space(uint8_t *buffer, uint64_t pos);
    uint32_t get_meta_block_used_space(uint32_t block_num);

    // get space usage statistics
@@ -117,9 +117,12 @@ public:

    journal_flusher_t *flusher;
    int write_iodepth = 0;
-    int inflight_big = 0;
    int intent_write_counter = 0;
-    bool fsyncing_data = false;
+    uint64_t data_fsync_next = 0;
+    uint64_t data_fsync_cur = 0;
+    uint64_t data_fsync_sent = 0;
+    uint64_t data_fsync_done = 0;
+    std::deque<bool> data_fsyncs;

    bool live = false, queue_stall = false;
    ring_loop_i *ringloop = NULL;
@@ -10,7 +10,6 @@
 #define INIT_META_EMPTY 0
 #define INIT_META_READING 1
 #define INIT_META_READ_DONE 2
-#define INIT_META_WRITING 3

 #define GET_SQE() \
    sqe = bs->get_sqe();\
@@ -23,14 +22,15 @@ blockstore_init_meta::blockstore_init_meta(blockstore_impl_t *bs)
    this->bs = bs;
 }

-void blockstore_init_meta::handle_event(ring_data_t *data, int buf_num)
+void blockstore_init_meta::handle_event(ring_data_t *data, int buf_num, const char *op)
 {
-    if (data->res < 0)
+    if (data->res != data->iov.iov_len)
    {
-        throw std::runtime_error(
-            std::string("read metadata failed at offset ") + std::to_string(buf_num >= 0 ? bufs[buf_num].offset : last_read_offset) +
-            std::string(": ") + strerror(-data->res)
-        );
+        throw std::runtime_error(strprintf(
+            "%s failed at offset %ju: got %s (code %d), but expected %zu",
+            op, (buf_num >= 0 ? bufs[buf_num].offset : last_read_offset), strerror(-data->res),
+            data->res, data->iov.iov_len
+        ));
    }
    if (buf_num >= 0)
    {
@@ -60,7 +60,7 @@ int blockstore_init_meta::loop()
    GET_SQE();
    last_read_offset = 0;
    data->iov = { bs->meta_superblock, (size_t)bs->dsk.meta_block_size };
-    data->callback = [this](ring_data_t *data) { handle_event(data, -1); };
+    data->callback = [this](ring_data_t *data) { handle_event(data, -1, "read metadata header"); };
    io_uring_prep_readv(sqe, bs->dsk.meta_fd, &data->iov, 1, bs->dsk.meta_offset);
    bs->ringloop->submit();
    submitted++;
@@ -72,25 +72,19 @@ resume_1:
    }
    if (is_zero((uint64_t*)bs->meta_superblock, bs->dsk.meta_block_size))
    {
-        {
-            blockstore_meta_header_v3_t *hdr = (blockstore_meta_header_v3_t *)bs->meta_superblock;
-            hdr->zero = 0;
-            hdr->magic = BLOCKSTORE_META_MAGIC_V1;
-            hdr->version = bs->dsk.meta_format;
-            hdr->meta_block_size = bs->dsk.meta_block_size;
-            hdr->data_block_size = bs->dsk.data_block_size;
-            hdr->bitmap_granularity = bs->dsk.bitmap_granularity;
-            if (bs->dsk.meta_format >= BLOCKSTORE_META_FORMAT_V2)
-            {
-                hdr->data_csum_type = bs->dsk.data_csum_type;
-                hdr->csum_block_size = bs->dsk.csum_block_size;
-            }
-            if (bs->dsk.meta_format >= BLOCKSTORE_META_FORMAT_HEAP)
-            {
-                hdr->meta_area_size = bs->dsk.meta_area_size;
-            }
-            hdr->set_crc32c();
-        }
+        assert(bs->dsk.meta_format == BLOCKSTORE_META_FORMAT_HEAP);
+        blockstore_meta_header_v3_t *hdr = (blockstore_meta_header_v3_t *)bs->meta_superblock;
+        hdr->zero = 0;
+        hdr->magic = BLOCKSTORE_META_MAGIC_V1;
+        hdr->version = bs->dsk.meta_format;
+        hdr->meta_block_size = bs->dsk.meta_block_size;
+        hdr->data_block_size = bs->dsk.data_block_size;
+        hdr->bitmap_granularity = bs->dsk.bitmap_granularity;
+        hdr->completed_lsn = 0;
+        hdr->data_csum_type = bs->dsk.data_csum_type;
+        hdr->csum_block_size = bs->dsk.csum_block_size;
+        hdr->meta_area_size = bs->dsk.meta_area_size;
+        hdr->set_crc32c();
        if (bs->readonly)
        {
            printf("Skipping metadata initialization because blockstore is readonly\n");
@@ -98,21 +92,8 @@ resume_1:
        else
        {
            printf("Initializing metadata area\n");
-            GET_SQE();
-            last_read_offset = 0;
-            data->iov = (struct iovec){ bs->meta_superblock, (size_t)bs->dsk.meta_block_size };
-            data->callback = [this](ring_data_t *data) { handle_event(data, -1); };
-            io_uring_prep_writev(sqe, bs->dsk.meta_fd, &data->iov, 1, bs->dsk.meta_offset);
-            bs->ringloop->submit();
-            submitted++;
-        resume_2:
-            if (submitted > 0)
-            {
-                wait_state = 2;
-                return 1;
-            }
-            zero_on_init = true;
        }
+        zero_on_init = true;
    }
    else
    {
@@ -163,7 +144,7 @@ resume_1:
        hdr->header_csum = csum;
    }
    bs->heap->start_load(((blockstore_meta_header_v3_t *)bs->meta_superblock)->completed_lsn);
-    if (bs->dsk.inmemory_journal)
+    if (bs->dsk.inmemory_journal && !zero_on_init)
    {
        // Read buffer area
        printf("Reading buffered data\n");
@@ -175,7 +156,7 @@ resume_1:
                bs->buffer_area + md_offset,
                (size_t)(bs->dsk.journal_len - md_offset < bs->metadata_buf_size ? bs->dsk.journal_len - md_offset : bs->metadata_buf_size),
            };
-            data->callback = [this](ring_data_t *data) { handle_event(data, -1); };
+            data->callback = [this](ring_data_t *data) { handle_event(data, -1, "read buffer area"); };
            io_uring_prep_readv(sqe, bs->dsk.journal_fd, &data->iov, 1, bs->dsk.journal_offset + md_offset);
            md_offset += data->iov.iov_len;
            submitted++;
@@ -194,7 +175,7 @@ resume_3:
    next_offset = md_offset;
    // Read the rest of the metadata
 resume_4:
-    if (next_offset < bs->dsk.meta_area_size && submitted == 0)
+    if (next_offset < bs->dsk.meta_area_size && submitted == 0 && (!zero_on_init || !bs->readonly))
    {
        // Submit one read
        for (int i = 0; i < 2; i++)
@@ -211,12 +192,15 @@ resume_4:
                GET_SQE();
                assert(bufs[i].size <= 0x7fffffff);
                data->iov = { bufs[i].buf, (size_t)bufs[i].size };
-                data->callback = [this, i](ring_data_t *data) { handle_event(data, i); };
                if (!zero_on_init)
+                {
+                    data->callback = [this, i](ring_data_t *data) { handle_event(data, i, "read metadata"); };
                    io_uring_prep_readv(sqe, bs->dsk.meta_fd, &data->iov, 1, bs->dsk.meta_offset + bufs[i].offset);
+                }
                else
                {
                    // Fill metadata with empty block pattern
+                    data->callback = [this, i](ring_data_t *data) { handle_event(data, i, "clear metadata"); };
                    memset(bufs[i].buf, 0, bufs[i].size);
                    for (uint64_t o = 0; o < bufs[i].size; o += bs->dsk.meta_block_size)
                        bs->heap->fill_block_empty_space(bufs[i].buf + o, 0);
@@ -232,11 +216,14 @@ resume_4:
        if (bufs[i].state == INIT_META_READ_DONE)
        {
            // Handle result
-            uint64_t loaded = 0;
-            int r = bs->heap->load_blocks(bufs[i].offset-bs->dsk.meta_block_size, bufs[i].size, bufs[i].buf, bs->skip_corrupted_meta_entries, loaded);
-            if (r != 0)
-                exit(1);
-            entries_loaded += loaded;
+            if (!zero_on_init)
+            {
+                uint64_t loaded = 0;
+                int r = bs->heap->load_blocks(bufs[i].offset-bs->dsk.meta_block_size, bufs[i].size, bufs[i].buf, bs->skip_corrupted_meta_entries, loaded);
+                if (r != 0)
+                    exit(1);
+                entries_loaded += loaded;
+            }
            bufs[i].state = 0;
            bs->ringloop->wakeup();
        }
@@ -246,7 +233,7 @@ resume_4:
        wait_state = 4;
        return 1;
    }
-    // metadata read finished
+    // metadata read/clear finished
    bs->heap->finish_load();
    printf("Metadata entries loaded: %ju, rechecking unfinished writes and garbage entries\n", entries_loaded);
    // asynchronous recheck
@@ -329,13 +316,14 @@ resume_9:
    }
    free(metadata_buffer);
    metadata_buffer = NULL;
+do_fsync:
    if (!bs->dsk.disable_meta_fsync && !bs->readonly)
    {
        GET_SQE();
        io_uring_prep_fsync(sqe, bs->dsk.meta_fd, IORING_FSYNC_DATASYNC);
        last_read_offset = 0;
        data->iov = { 0 };
-        data->callback = [this](ring_data_t *data) { handle_event(data, -1); };
+        data->callback = [this](ring_data_t *data) { handle_event(data, -1, "fsync metadata"); };
        submitted++;
        bs->ringloop->submit();
    resume_5:
@@ -345,6 +333,27 @@ resume_9:
            return 1;
        }
    }
+    if (zero_on_init && !header_written && !bs->readonly)
+    {
+        GET_SQE();
+        header_written = true;
+        last_read_offset = 0;
+        data->iov = (struct iovec){ bs->meta_superblock, (size_t)bs->dsk.meta_block_size };
+        data->callback = [this](ring_data_t *data) { handle_event(data, -1, "write metadata header"); };
+        io_uring_prep_writev(sqe, bs->dsk.meta_fd, &data->iov, 1, bs->dsk.meta_offset);
+        bs->ringloop->submit();
+        submitted++;
+    resume_2:
+        if (submitted > 0)
+        {
+            wait_state = 2;
+            return 1;
+        }
+        if (!bs->dsk.disable_meta_fsync)
+        {
+            goto do_fsync;
+        }
+    }
    printf("Loading finished. Data used: %ju / %ju bytes (%s / %s)\n",
        bs->heap->get_data_used_space(), bs->dsk.block_count * bs->dsk.data_block_size,
        format_size(bs->heap->get_data_used_space()).c_str(),
@@ -17,6 +17,7 @@ class blockstore_init_meta
    int wait_state = 0;
    int wait_count = 0;
    bool zero_on_init = false;
+    bool header_written = false;
    void *metadata_buffer = NULL;
    blockstore_init_meta_buf bufs[2] = {};
    int submitted = 0;
@@ -29,7 +30,7 @@ class blockstore_init_meta
    std::vector<uint32_t> recheck_mod;
    int i = 0, j = 0;
    bool handle_meta_block(uint8_t *buf, uint64_t count, uint64_t done_cnt);
-    void handle_event(ring_data_t *data, int buf_num);
+    void handle_event(ring_data_t *data, int buf_num, const char *op);
 public:
    blockstore_init_meta(blockstore_impl_t *bs);
    int loop();
@@ -0,0 +1,113 @@
+// Copyright (c) Vitaliy Filippov, 2019+
+// License: VNPL-1.1 (see README.md for details)
+
+#include "blockstore_mock.h"
+
+blockstore_mock_t::blockstore_mock_t(const blockstore_config_t & config)
+{
+}
+
+void blockstore_mock_t::parse_config(blockstore_config_t & config)
+{
+}
+
+void* blockstore_mock_t::reshard_start(pool_id_t pool, uint32_t pg_count, uint32_t pg_stripe_size, uint64_t chunk_limit)
+{
+    return NULL;
+}
+
+bool blockstore_mock_t::reshard_continue(void *reshard_state, uint64_t chunk_limit)
+{
+    return true;
+}
+
+void blockstore_mock_t::loop()
+{
+}
+
+bool blockstore_mock_t::is_started()
+{
+    return true;
+}
+
+bool blockstore_mock_t::is_stalled()
+{
+    return false;
+}
+
+bool blockstore_mock_t::is_safe_to_stop()
+{
+    return true;
+}
+
+void blockstore_mock_t::enqueue_op(blockstore_op_t *op)
+{
+}
+
+int blockstore_mock_t::read_bitmap(object_id oid, uint64_t target_version, void *bitmap, uint64_t *result_version)
+{
+    return -EIO;
+}
+
+const std::map<uint64_t, uint64_t> & blockstore_mock_t::get_inode_space_stats()
+{
+    return inode_space;
+}
+
+void blockstore_mock_t::set_no_inode_stats(const std::vector<uint64_t> & pool_ids)
+{
+}
+
+void blockstore_mock_t::dump_diagnostics()
+{
+}
+
+std::string blockstore_mock_t::get_op_diag(blockstore_op_t *op)
+{
+    return "";
+}
+
+uint32_t blockstore_mock_t::get_block_size()
+{
+    return block_size;
+}
+
+uint64_t blockstore_mock_t::get_block_count()
+{
+    return block_count;
+}
+
+uint64_t blockstore_mock_t::get_free_block_count()
+{
+    return block_count;
+}
+
+uint64_t blockstore_mock_t::get_journal_size()
+{
+    return 32*1024*1024;
+}
+
+uint32_t blockstore_mock_t::get_bitmap_granularity()
+{
+    return bitmap_granularity;
+}
+
+uint64_t blockstore_mock_t::get_live_entries()
+{
+    return 0;
+}
+
+uint64_t blockstore_mock_t::get_live_memory()
+{
+    return 0;
+}
+
+uint64_t blockstore_mock_t::get_garbage_entries()
+{
+    return 0;
+}
+
+uint64_t blockstore_mock_t::get_garbage_memory()
+{
+    return 0;
+}
@@ -0,0 +1,39 @@
+// Copyright (c) Vitaliy Filippov, 2019+
+// License: VNPL-1.1 (see README.md for details)
+
+#pragma once
+
+#include "blockstore.h"
+
+class blockstore_mock_t: public blockstore_i
+{
+public:
+    uint32_t block_size = 128*1024;
+    uint32_t bitmap_granularity = 4096;
+    uint64_t block_count = 100*1024*8;
+    std::map<uint64_t, uint64_t> inode_space;
+
+    blockstore_mock_t(const blockstore_config_t & config);
+    void parse_config(blockstore_config_t & config) override;
+    void* reshard_start(pool_id_t pool, uint32_t pg_count, uint32_t pg_stripe_size, uint64_t chunk_limit) override;
+    bool reshard_continue(void *reshard_state, uint64_t chunk_limit) override;
+    void loop() override;
+    bool is_started() override;
+    bool is_stalled() override;
+    bool is_safe_to_stop() override;
+    void enqueue_op(blockstore_op_t *op) override;
+    int read_bitmap(object_id oid, uint64_t target_version, void *bitmap, uint64_t *result_version = NULL) override;
+    const std::map<uint64_t, uint64_t> & get_inode_space_stats() override;
+    void set_no_inode_stats(const std::vector<uint64_t> & pool_ids) override;
+    void dump_diagnostics() override;
+    std::string get_op_diag(blockstore_op_t *op) override;
+    uint32_t get_block_size() override;
+    uint64_t get_block_count() override;
+    uint64_t get_free_block_count() override;
+    uint64_t get_journal_size() override;
+    uint32_t get_bitmap_granularity() override;
+    uint64_t get_live_entries() override;
+    uint64_t get_live_memory() override;
+    uint64_t get_garbage_entries() override;
+    uint64_t get_garbage_memory() override;
+};
@@ -28,6 +28,7 @@ int blockstore_impl_t::dequeue_stable(blockstore_op_t *op)
                FINISH_OP(op);
                return 2;
            }
+            priv->modified_block2 = UINT32_MAX;
            int res = op->opcode == BS_OP_STABLE
                ? heap->add_commit(obj, v[priv->stab_pos].version, &priv->modified_block2)
                : heap->add_rollback(obj, v[priv->stab_pos].version, &priv->modified_block2);
@@ -52,11 +53,6 @@ int blockstore_impl_t::dequeue_stable(blockstore_op_t *op)
                    FINISH_OP(op);
                    return 2;
                }
-                if (priv->modified_block2 != UINT32_MAX)
-                {
-                    priv->stab_pos--;
-                    goto resume_1;
-                }
                priv->wait_for = WAIT_COMPACTION;
                priv->wait_detail = heap->get_compacted_count();
                flusher->request_trim();
@@ -29,9 +29,12 @@ bool blockstore_impl_t::has_unsynced()

 bool blockstore_impl_t::submit_fsyncs(int & wait_count)
 {
-    int n = (unsynced_meta_write_count > 0 && !dsk.disable_meta_fsync) +
-        (unsynced_buffer_write_count > 0 && !dsk.disable_journal_fsync && dsk.journal_fd != dsk.meta_fd) +
-        (unsynced_data_write_count > 0 && !dsk.disable_data_fsync && dsk.data_fd != dsk.meta_fd && dsk.data_fd != dsk.journal_fd);
+    int n = (unsynced_meta_write_count > 0 && !dsk.disable_meta_fsync ? 1 : 0) +
+        (unsynced_buffer_write_count > 0 && !dsk.disable_journal_fsync &&
+            (!unsynced_meta_write_count || dsk.journal_fd != dsk.meta_fd) ? 1 : 0) +
+        (unsynced_data_write_count > 0 && !dsk.disable_data_fsync &&
+            (!unsynced_meta_write_count || dsk.data_fd != dsk.meta_fd) &&
+            (!unsynced_buffer_write_count || dsk.data_fd != dsk.journal_fd) ? 1 : 0);
    if (ringloop->space_left() < n)
    {
        return false;
@@ -60,7 +63,8 @@ bool blockstore_impl_t::submit_fsyncs(int & wait_count)
        data->callback = cb;
        wait_count++;
    }
-    if (unsynced_buffer_write_count > 0 && !dsk.disable_journal_fsync && dsk.meta_fd != dsk.journal_fd)
+    if (unsynced_buffer_write_count > 0 && !dsk.disable_journal_fsync &&
+        (!unsynced_meta_write_count || dsk.journal_fd != dsk.meta_fd))
    {
        // fsync buffer
        io_uring_sqe *sqe = get_sqe();
@@ -71,7 +75,9 @@ bool blockstore_impl_t::submit_fsyncs(int & wait_count)
        data->callback = cb;
        wait_count++;
    }
-    if (unsynced_data_write_count > 0 && !dsk.disable_data_fsync && dsk.data_fd != dsk.meta_fd && dsk.data_fd != dsk.journal_fd)
+    if (unsynced_data_write_count > 0 && !dsk.disable_data_fsync &&
+        (!unsynced_meta_write_count || dsk.data_fd != dsk.meta_fd) &&
+        (!unsynced_buffer_write_count || dsk.data_fd != dsk.journal_fd))
    {
        // fsync data
        io_uring_sqe *sqe = get_sqe();
@@ -109,6 +115,7 @@ int blockstore_impl_t::do_sync(blockstore_op_t *op, int base_state)
    PRIV(op)->lsn = heap->get_completed_lsn();
    if (!submit_fsyncs(PRIV(op)->pending_ops))
    {
+        PRIV(op)->lsn = 0;
        PRIV(op)->wait_detail = 1;
        PRIV(op)->wait_for = WAIT_SQE;
        return 0;
@@ -180,13 +180,16 @@ enospc:
        data->callback = [this, op](ring_data_t *data) { handle_write_event(data, op); };
        assert(loc+op->offset+op->len <= dsk.block_count*dsk.data_block_size);
        io_uring_prep_writev(sqe, dsk.data_fd, &data->iov, 1, dsk.data_offset + loc + op->offset);
+        if (!dsk.disable_data_fsync)
+        {
+            // use PRIV->lsn for fsync_data_id
+            PRIV(op)->lsn = ++data_fsync_next;
+            data_fsyncs.push_back(false);
+        }
        PRIV(op)->pending_ops++;
        write_iodepth++;
        if (PRIV(op)->write_type == BS_HEAP_BIG_WRITE)
-        {
            PRIV(op)->op_state = 1;
-            inflight_big++;
-        }
        else
            PRIV(op)->op_state = 3;
    }
@@ -297,8 +300,6 @@ again:
        goto resume_10;
    else if (op_state == 11)
        goto resume_11;
-    else if (op_state == 12)
-        goto resume_12;
    else
    {
        // In progress
@@ -317,38 +318,44 @@ again:
 resume_2:
    // We must fsync all big writes to avoid complex write workflows
    // It's OK for all HDDs and for server SSDs, but slightly worse for desktop SSDs
-    inflight_big--;
    if (!dsk.disable_data_fsync)
    {
-        // fsync data in a batch
-resume_11:
-        if (inflight_big > 0)
+        // Mark our data write as completed and advance data_fsync_cur
+        data_fsyncs[PRIV(op)->lsn - data_fsync_cur - 1] = true;
+        while (data_fsyncs.size() > 0 && data_fsyncs.front())
+        {
+            data_fsyncs.pop_front();
+            data_fsync_cur++;
+        }
+        PRIV(op)->op_state = 11;
+        // Then wait for all other data writes currently in progress to do less fsync calls
+        // I.e. to fsync data in batches
+        PRIV(op)->lsn = data_fsync_cur + data_fsyncs.size();
+resume_11:
+        if (data_fsync_cur < PRIV(op)->lsn)
        {
-            PRIV(op)->op_state = 11;
            return 1;
        }
-        if (fsyncing_data)
+        if (PRIV(op)->lsn > data_fsync_sent)
        {
-resume_12:
-            if (fsyncing_data)
+            BS_SUBMIT_GET_SQE(sqe, data);
+            io_uring_prep_fsync(sqe, dsk.data_fd, IORING_FSYNC_DATASYNC);
+            data->iov = { 0 };
+            data->callback = [this, op, fs = data_fsync_cur](ring_data_t *data)
            {
-                PRIV(op)->op_state = 12;
-                return 1;
-            }
-            goto resume_4;
+                if (fs > data_fsync_done)
+                {
+                    data_fsync_done = fs;
+                    ringloop->wakeup();
+                }
+            };
+            data_fsync_sent = data_fsync_cur;
        }
-        fsyncing_data = true;
-        BS_SUBMIT_GET_SQE(sqe, data);
-        io_uring_prep_fsync(sqe, dsk.data_fd, IORING_FSYNC_DATASYNC);
-        data->iov = { 0 };
-        data->callback = [this, op](ring_data_t *data)
+        if (PRIV(op)->lsn > data_fsync_done)
        {
-            fsyncing_data = false;
-            handle_write_event(data, op);
-        };
-        PRIV(op)->pending_ops++;
-        PRIV(op)->op_state = 3;
-        return 1;
+            return 1;
+        }
+        PRIV(op)->lsn = 0;
    }
 resume_4:
    {
@@ -171,7 +171,7 @@ void multilist_alloc_t::print()
    printf("\n");
 }

-void multilist_alloc_t::use(uint32_t pos, uint32_t size)
+bool multilist_alloc_t::use(uint32_t pos, uint32_t size)
 {
    assert(pos+size <= count && size > 0);
    if (sizes[pos] <= 0)
@@ -182,7 +182,8 @@ void multilist_alloc_t::use(uint32_t pos, uint32_t size)
        else
            while (start > 0 && !sizes[start])
                start--;
-        assert(sizes[start] >= size);
+        if (sizes[start] < size+(pos-start))
+            return false;
        use_full(start);
        uint32_t full = sizes[start];
        sizes[pos-1] = -pos+start;
@@ -199,7 +200,8 @@ void multilist_alloc_t::use(uint32_t pos, uint32_t size)
    }
    else
    {
-        assert(sizes[pos] >= size);
+        if (sizes[pos] < size)
+            return false;
        use_full(pos);
        if (sizes[pos] > size)
        {
@@ -214,12 +216,13 @@ void multilist_alloc_t::use(uint32_t pos, uint32_t size)
 #ifdef MULTILIST_TRACE
    print();
 #endif
+    return true;
 }

 void multilist_alloc_t::use_full(uint32_t pos)
 {
    uint32_t prevsize = sizes[pos];
-    assert(prevsize);
+    assert(prevsize > 0);
    assert(nexts[pos]);
    uint32_t pi = (prevsize < maxn ? prevsize : maxn)-1;
    if (heads[pi] == pos+1)
@@ -17,7 +17,7 @@ struct multilist_alloc_t
    bool is_free(uint32_t pos);
    uint32_t find(uint32_t size);
    void use_full(uint32_t pos);
-    void use(uint32_t pos, uint32_t size);
+    bool use(uint32_t pos, uint32_t size);
    void do_free(uint32_t pos);
    void free(uint32_t pos);
    void verify();
@@ -71,6 +71,11 @@ bool journal_flusher_t::is_active()
    return active_flushers > 0 || dequeuing;
 }

+size_t journal_flusher_t::get_queue_size()
+{
+    return flush_queue.size();
+}
+
 void journal_flusher_t::loop()
 {
    target_flusher_count = bs->write_iodepth*2;
@@ -384,6 +389,7 @@ stop_flusher:
        wait_state = 0;
        return true;
    }
+    copy_count = 0;
    try_trim = true;
    cur.oid = flusher->flush_queue.front();
    cur.version = flusher->flush_versions[cur.oid];
@@ -511,6 +517,31 @@ resume_2:
            {
                uo_it->second.was_changed = true;
            }
+            if (!bs->journal.inmemory)
+            {
+                // Verify journaled data checksums (but not COALESCED)
+                for (it = v.begin(); it != v.end(); it++)
+                {
+                    if (it->copy_flags == COPY_BUF_JOURNAL)
+                    {
+                        iovec iov = { .iov_base = it->buf, .iov_len = it->len };
+                        bs->verify_journal_checksums(
+                            it->csum_buf, it->offset, &iov, 1,
+                            [&](uint32_t bad_block, uint32_t calc_csum, uint32_t stored_csum)
+                            {
+                                printf(
+                                    "Checksum mismatch in object %jx:%jx v%ju in journal at 0x%jx, checksum block #%u: got %08x, expected %08x\n",
+                                    cur.oid.inode, cur.oid.stripe, cur.version, it->disk_offset,
+                                    bad_block / bs->dsk.csum_block_size, calc_csum, stored_csum
+                                );
+                                bad_block += it->offset;
+                                assert(!(bad_block % bs->dsk.csum_block_size) && bad_block < bs->dsk.data_block_size);
+                                mangle_csum_blocks.insert(bad_block);
+                            }
+                        );
+                    }
+                }
+            }
        }
        // Submit data writes
        for (it = v.begin(); it != v.end(); it++)
@@ -634,6 +665,7 @@ resume_2:
        }
        // All done
        flusher->active_flushers--;
+        copy_count = 0; // used by is_mutated()...
        wait_state = 0;
        goto resume_0;
    }
@@ -815,35 +847,21 @@ bool journal_flusher_co::clear_incomplete_csum_block_bits(int wait_base)
                bs->verify_padded_checksums(new_clean_bitmap, new_clean_bitmap + 2*bs->dsk.clean_entry_bitmap_size,
                    v[i].offset, &iov, 1, [&](uint32_t bad_block, uint32_t calc_csum, uint32_t stored_csum)
                {
-                    printf("Checksum mismatch in object %jx:%jx v%ju in data area at offset 0x%jx+0x%x: got %08x, expected %08x\n",
+                    printf("Checksum mismatch in object %jx:%jx v%ju in data area at offset 0x%jx+0x%x during flush: got %08x, expected %08x\n",
                        cur.oid.inode, cur.oid.stripe, old_clean_ver, old_clean_loc, bad_block, calc_csum, stored_csum);
-                    for (uint32_t j = 0; j < bs->dsk.csum_block_size; j += bs->dsk.bitmap_granularity)
-                    {
-                        // Simplest method of mangling: flip one byte in every sector
-                        ((uint8_t*)v[i].buf)[j+bad_block-v[i].offset] ^= 0xff;
-                    }
+                    assert(!(bad_block % bs->dsk.csum_block_size) && bad_block < bs->dsk.data_block_size);
+                    mangle_csum_blocks.insert(bad_block);
                });
            }
            else
            {
                bs->verify_journal_checksums(v[i].csum_buf, v[i].offset, &iov, 1, [&](uint32_t bad_block, uint32_t calc_csum, uint32_t stored_csum)
                {
-                    printf("Checksum mismatch in object %jx:%jx v%ju in journal at offset 0x%jx+0x%x (block offset 0x%jx): got %08x, expected %08x\n",
+                    printf("Checksum mismatch in object %jx:%jx v%ju in journal at offset 0x%jx+0x%x (block offset 0x%jx) during flush: got %08x, expected %08x\n",
                        cur.oid.inode, cur.oid.stripe, old_clean_ver,
                        v[i].disk_offset, bad_block, v[i].offset, calc_csum, stored_csum);
-                    bad_block += (v[i].offset/bs->dsk.csum_block_size) * bs->dsk.csum_block_size;
-                    uint32_t bad_block_end = bad_block + bs->dsk.csum_block_size + (v[i].offset/bs->dsk.csum_block_size) * bs->dsk.csum_block_size;
-                    if (bad_block < v[i].offset)
-                        bad_block = v[i].offset;
-                    if (bad_block_end > v[i].offset+v[i].len)
-                        bad_block_end = v[i].offset+v[i].len;
-                    bad_block -= v[i].offset;
-                    bad_block_end -= v[i].offset;
-                    for (uint32_t j = bad_block; j < bad_block_end; j += bs->dsk.bitmap_granularity)
-                    {
-                        // Simplest method of mangling: flip one byte in every sector
-                        ((uint8_t*)v[i].buf)[j] ^= 0xff;
-                    }
+                    assert(!(bad_block % bs->dsk.csum_block_size) && bad_block < bs->dsk.data_block_size);
+                    mangle_csum_blocks.insert(bad_block);
                });
            }
        }
@@ -952,6 +970,11 @@ void journal_flusher_co::calc_block_checksums(uint32_t *new_data_csums, bool ski
    }
    // `v` should contain aligned items, possibly split into pieces
    assert(!block_done);
+    for (uint32_t mangle_block: mangle_csum_blocks)
+    {
+        // Flip 1 bit
+        new_data_csums[mangle_block / bs->dsk.csum_block_size] ^= 1;
+    }
 }

 void journal_flusher_co::scan_dirty()
@@ -1088,7 +1111,8 @@ void journal_flusher_co::scan_dirty()
            last--;
        read_to_fill_incomplete = bs->fill_partial_checksum_blocks(
            v, fulfilled, bmp_ptr, NULL, false, NULL, v[0].offset/bs->dsk.csum_block_size * bs->dsk.csum_block_size,
-            ((v[last].offset+v[last].len-1) / bs->dsk.csum_block_size + 1) * bs->dsk.csum_block_size
+            ((v[last].offset+v[last].len-1) / bs->dsk.csum_block_size + 1) * bs->dsk.csum_block_size,
+            0, bs->dsk.data_block_size
        );
    }
    else if (fill_incomplete && clean_init_bitmap)
@@ -1118,6 +1142,7 @@ bool journal_flusher_co::read_dirty(int wait_base)
    if (wait_state == wait_base)        goto resume_0;
    else if (wait_state == wait_base+1) goto resume_1;
    wait_count = wait_journal_count = 0;
+    mangle_csum_blocks.clear();
    if (bs->journal.inmemory && !read_to_fill_incomplete)
    {
        // Happy path: nothing to read :)
@@ -66,6 +66,7 @@ class journal_flusher_co
    uint64_t clean_bitmap_offset, clean_bitmap_len;
    uint8_t *clean_init_dyn_ptr;
    uint8_t *new_clean_bitmap;
+    std::unordered_set<uint32_t> mangle_csum_blocks;

    uint64_t new_trim_pos;

@@ -123,6 +124,7 @@ public:
    void loop();
    bool is_trim_wanted() { return trim_wanted; }
    bool is_active();
+    size_t get_queue_size();
    void mark_trim_possible();
    void request_trim();
    void release_trim();
@@ -6,11 +6,12 @@

 namespace v1 {

-blockstore_impl_t::blockstore_impl_t(blockstore_config_t & config, ring_loop_i *ringloop, timerfd_manager_t *tfd)
+blockstore_impl_t::blockstore_impl_t(blockstore_config_t & config, ring_loop_i *ringloop, timerfd_manager_t *tfd, bool mock_mode)
 {
    assert(sizeof(blockstore_op_private_t) <= BS_OP_PRIVATE_DATA_SIZE);
    this->tfd = tfd;
    this->ringloop = ringloop;
+    dsk.mock_mode = mock_mode;
    ring_consumer.loop = [this]() { loop(); };
    ringloop->register_consumer(&ring_consumer);
    initialized = 0;
@@ -35,6 +36,11 @@ blockstore_impl_t::blockstore_impl_t(blockstore_config_t & config, ring_loop_i *

 blockstore_impl_t::~blockstore_impl_t()
 {
+    for (auto& obj: dirty_db)
+    {
+        if (obj.second.dyn_data)
+            free(obj.second.dyn_data);
+    }
    delete data_alloc;
    delete flusher;
    if (zero_object)
@@ -30,6 +30,8 @@

 //#define BLOCKSTORE_DEBUG

+struct bs_test_t;
+
 namespace v1 {

 #include "journal.h"
@@ -96,7 +98,7 @@ struct blockstore_op_private_t
    int op_state;

    // Read
-    uint64_t clean_block_used;
+    uint64_t clean_loc_used;
    std::vector<copy_buffer_t> read_vec;

    // Sync, write
@@ -122,6 +124,7 @@ typedef uint64_t pool_pg_id_t;

 class blockstore_impl_t: public blockstore_i
 {
+    friend struct ::bs_test_t;
    blockstore_disk_t dsk;

    /******* OPTIONS *******/
@@ -220,6 +223,7 @@ class blockstore_impl_t: public blockstore_i

    // Read
    int dequeue_read(blockstore_op_t *read_op);
+    void release_clean(blockstore_op_t *op);
    void find_holes(std::vector<copy_buffer_t> & read_vec, uint32_t item_start, uint32_t item_end,
        std::function<int(int, bool, uint32_t, uint32_t)> callback);
    int fulfill_read(blockstore_op_t *read_op,
@@ -230,7 +234,8 @@ class blockstore_impl_t: public blockstore_i
        uint8_t *clean_entry_bitmap, int *dyn_data,
        uint32_t item_start, uint32_t item_end, uint64_t clean_loc, uint64_t clean_ver);
    int fill_partial_checksum_blocks(std::vector<copy_buffer_t> & rv, uint64_t & fulfilled,
-        uint8_t *clean_entry_bitmap, int *dyn_data, bool from_journal, uint8_t *read_buf, uint64_t read_offset, uint64_t read_end);
+        uint8_t *clean_entry_bitmap, int *dyn_data, bool from_journal, uint8_t *read_buf,
+        uint32_t read_offset, uint32_t read_end, uint32_t item_start, uint32_t item_end);
    int pad_journal_read(std::vector<copy_buffer_t> & rv, copy_buffer_t & cp,
        uint64_t dirty_offset, uint64_t dirty_end, uint64_t dirty_loc, uint8_t *csum_ptr, int *dyn_data,
        uint64_t offset, uint64_t submit_len, uint64_t & blk_begin, uint64_t & blk_end, uint8_t* & blk_buf);
@@ -281,7 +286,7 @@ class blockstore_impl_t: public blockstore_i

 public:

-    blockstore_impl_t(blockstore_config_t & config, ring_loop_i *ringloop, timerfd_manager_t *tfd);
+    blockstore_impl_t(blockstore_config_t & config, ring_loop_i *ringloop, timerfd_manager_t *tfd, bool mock_mode = false);
    ~blockstore_impl_t();

    void parse_config(blockstore_config_t & config);
@@ -1,6 +1,7 @@
 // Copyright (c) Vitaliy Filippov, 2019+
 // License: VNPL-1.1 (see README.md for details)

+#include "str_util.h"
 #include "impl.h"
 #include "internal.h"

@@ -30,14 +31,15 @@ blockstore_init_meta::blockstore_init_meta(blockstore_impl_t *bs)
    this->bs = bs;
 }

-void blockstore_init_meta::handle_event(ring_data_t *data, int buf_num)
+void blockstore_init_meta::handle_event(ring_data_t *data, int buf_num, const char *op)
 {
-    if (data->res < 0)
+    if (data->res != data->iov.iov_len)
    {
-        throw std::runtime_error(
-            std::string("read metadata failed at offset ") + std::to_string(buf_num >= 0 ? bufs[buf_num].offset : last_read_offset) +
-            std::string(": ") + strerror(-data->res)
-        );
+        throw std::runtime_error(strprintf(
+            "%s failed at offset %ju: got %s (code %d), but expected %zu",
+            op, (buf_num >= 0 ? bufs[buf_num].offset : last_read_offset), strerror(-data->res),
+            data->res, data->iov.iov_len
+        ));
    }
    if (buf_num >= 0)
    {
@@ -65,10 +67,11 @@ int blockstore_init_meta::loop()
    if (!metadata_buffer)
        throw std::runtime_error("Failed to allocate metadata read buffer");
    // Read superblock
+    hdr = (blockstore_meta_header_v2_t *)memalign_or_die(MEM_ALIGNMENT, bs->dsk.meta_block_size);
    GET_SQE();
    last_read_offset = 0;
-    data->iov = { metadata_buffer, (size_t)bs->dsk.meta_block_size };
-    data->callback = [this](ring_data_t *data) { handle_event(data, -1); };
+    data->iov = { hdr, (size_t)bs->dsk.meta_block_size };
+    data->callback = [this](ring_data_t *data) { handle_event(data, -1, "read metadata header"); };
    io_uring_prep_readv(sqe, bs->dsk.meta_fd, &data->iov, 1, bs->dsk.meta_offset);
    bs->ringloop->submit();
    submitted++;
@@ -78,24 +81,8 @@ resume_1:
        wait_state = 1;
        return 1;
    }
-    if (iszero((uint64_t*)metadata_buffer, bs->dsk.meta_block_size / sizeof(uint64_t)))
+    if (iszero((uint64_t*)hdr, bs->dsk.meta_block_size / sizeof(uint64_t)))
    {
-        {
-            blockstore_meta_header_v2_t *hdr = (blockstore_meta_header_v2_t *)metadata_buffer;
-            hdr->zero = 0;
-            hdr->magic = BLOCKSTORE_META_MAGIC_V1;
-            hdr->version = bs->dsk.meta_format;
-            hdr->meta_block_size = bs->dsk.meta_block_size;
-            hdr->data_block_size = bs->dsk.data_block_size;
-            hdr->bitmap_granularity = bs->dsk.bitmap_granularity;
-            if (bs->dsk.meta_format >= BLOCKSTORE_META_FORMAT_V2)
-            {
-                hdr->data_csum_type = bs->dsk.data_csum_type;
-                hdr->csum_block_size = bs->dsk.csum_block_size;
-                hdr->header_csum = 0;
-                hdr->header_csum = crc32c(0, hdr, sizeof(*hdr));
-            }
-        }
        if (bs->readonly)
        {
            printf("Skipping metadata initialization because blockstore is readonly\n");
@@ -103,25 +90,11 @@ resume_1:
        else
        {
            printf("Initializing metadata area\n");
-            GET_SQE();
-            last_read_offset = 0;
-            data->iov = (struct iovec){ metadata_buffer, (size_t)bs->dsk.meta_block_size };
-            data->callback = [this](ring_data_t *data) { handle_event(data, -1); };
-            io_uring_prep_writev(sqe, bs->dsk.meta_fd, &data->iov, 1, bs->dsk.meta_offset);
-            bs->ringloop->submit();
-            submitted++;
-        resume_3:
-            if (submitted > 0)
-            {
-                wait_state = 3;
-                return 1;
-            }
-            zero_on_init = true;
        }
+        zero_on_init = true;
    }
    else
    {
-        blockstore_meta_header_v2_t *hdr = (blockstore_meta_header_v2_t *)metadata_buffer;
        if (hdr->zero != 0 || hdr->magic != BLOCKSTORE_META_MAGIC_V1 || hdr->version < BLOCKSTORE_META_FORMAT_V1)
        {
            printf(
@@ -223,12 +196,15 @@ resume_2:
                GET_SQE();
                assert(bufs[i].size <= 0x7fffffff);
                data->iov = { bufs[i].buf, (size_t)bufs[i].size };
-                data->callback = [this, i](ring_data_t *data) { handle_event(data, i); };
                if (!zero_on_init)
+                {
+                    data->callback = [this, i](ring_data_t *data) { handle_event(data, i, "read metadata"); };
                    io_uring_prep_readv(sqe, bs->dsk.meta_fd, &data->iov, 1, bs->dsk.meta_offset + bufs[i].offset);
+                }
                else
                {
                    // Fill metadata with zeroes
+                    data->callback = [this, i](ring_data_t *data) { handle_event(data, i, "clear metadata"); };
                    memset(data->iov.iov_base, 0, data->iov.iov_len);
                    io_uring_prep_writev(sqe, bs->dsk.meta_fd, &data->iov, 1, bs->dsk.meta_offset + bufs[i].offset);
                }
@@ -256,7 +232,7 @@ resume_2:
                GET_SQE();
                assert(bufs[i].size <= 0x7fffffff);
                data->iov = { bufs[i].buf, (size_t)bufs[i].size };
-                data->callback = [this, i](ring_data_t *data) { handle_event(data, i); };
+                data->callback = [this, i](ring_data_t *data) { handle_event(data, i, "write metadata"); };
                io_uring_prep_writev(sqe, bs->dsk.meta_fd, &data->iov, 1, bs->dsk.meta_offset + bufs[i].offset);
                bs->ringloop->submit();
                bufs[i].state = INIT_META_WRITING;
@@ -285,7 +261,7 @@ resume_2:
            GET_SQE();
            last_read_offset = (1+next_offset)*bs->dsk.meta_block_size;
            data->iov = { metadata_buffer, (size_t)bs->dsk.meta_block_size };
-            data->callback = [this](ring_data_t *data) { handle_event(data, -1); };
+            data->callback = [this](ring_data_t *data) { handle_event(data, -1, "read metadata"); };
            io_uring_prep_readv(sqe, bs->dsk.meta_fd, &data->iov, 1, bs->dsk.meta_offset + (1+next_offset)*bs->dsk.meta_block_size);
            bs->ringloop->submit();
            submitted++;
@@ -302,7 +278,7 @@ resume_5:
            }
            GET_SQE();
            data->iov = { metadata_buffer, (size_t)bs->dsk.meta_block_size };
-            data->callback = [this](ring_data_t *data) { handle_event(data, -1); };
+            data->callback = [this](ring_data_t *data) { handle_event(data, -1, "write metadata"); };
            io_uring_prep_writev(sqe, bs->dsk.meta_fd, &data->iov, 1, bs->dsk.meta_offset + (1+next_offset)*bs->dsk.meta_block_size);
            bs->ringloop->submit();
            submitted++;
@@ -317,27 +293,64 @@ resume_6:
    }
    // metadata read finished
    printf("Metadata entries loaded: %ju, free blocks: %ju / %ju\n", entries_loaded, bs->data_alloc->get_free_count(), bs->dsk.block_count);
+    if (zero_on_init && !bs->readonly)
+    {
+do_fsync:
+        if (!bs->disable_meta_fsync)
+        {
+            GET_SQE();
+            io_uring_prep_fsync(sqe, bs->dsk.meta_fd, IORING_FSYNC_DATASYNC);
+            last_read_offset = 0;
+            data->iov = { 0 };
+            data->callback = [this](ring_data_t *data) { handle_event(data, -1, "fsync metadata"); };
+            submitted++;
+            bs->ringloop->submit();
+resume_4:
+            if (submitted > 0)
+            {
+                wait_state = 4;
+                return 1;
+            }
+        }
+        if (!header_written)
+        {
+            GET_SQE();
+            hdr->zero = 0;
+            hdr->magic = BLOCKSTORE_META_MAGIC_V1;
+            hdr->version = bs->dsk.meta_format;
+            hdr->meta_block_size = bs->dsk.meta_block_size;
+            hdr->data_block_size = bs->dsk.data_block_size;
+            hdr->bitmap_granularity = bs->dsk.bitmap_granularity;
+            if (bs->dsk.meta_format >= BLOCKSTORE_META_FORMAT_V2)
+            {
+                hdr->data_csum_type = bs->dsk.data_csum_type;
+                hdr->csum_block_size = bs->dsk.csum_block_size;
+                hdr->header_csum = 0;
+                hdr->header_csum = crc32c(0, hdr, sizeof(*hdr));
+            }
+            header_written = true;
+            last_read_offset = 0;
+            data->iov = (struct iovec){ hdr, (size_t)bs->dsk.meta_block_size };
+            data->callback = [this](ring_data_t *data) { handle_event(data, -1, "write metadata header"); };
+            io_uring_prep_writev(sqe, bs->dsk.meta_fd, &data->iov, 1, bs->dsk.meta_offset);
+            bs->ringloop->submit();
+            submitted++;
+resume_3:
+            if (submitted > 0)
+            {
+                wait_state = 3;
+                return 1;
+            }
+            goto do_fsync;
+        }
+    }
    if (!bs->inmemory_meta)
    {
        free(metadata_buffer);
        metadata_buffer = NULL;
    }
-    if (zero_on_init && !bs->disable_meta_fsync)
-    {
-        GET_SQE();
-        io_uring_prep_fsync(sqe, bs->dsk.meta_fd, IORING_FSYNC_DATASYNC);
-        last_read_offset = 0;
-        data->iov = { 0 };
-        data->callback = [this](ring_data_t *data) { handle_event(data, -1); };
-        submitted++;
-        bs->ringloop->submit();
-    resume_4:
-        if (submitted > 0)
-        {
-            wait_state = 4;
-            return 1;
-        }
-    }
+    free(hdr);
+    hdr = NULL;
    return 0;
 }

@@ -345,6 +358,8 @@ bool blockstore_init_meta::handle_meta_block(uint8_t *buf, uint64_t entries_per_
 {
    bool updated = false;
    uint64_t max_i = entries_per_block;
+    if (done_cnt > bs->dsk.block_count)
+        return false;
    if (max_i > bs->dsk.block_count-done_cnt)
        max_i = bs->dsk.block_count-done_cnt;
    for (uint64_t i = 0; i < max_i; i++)
@@ -455,21 +470,21 @@ blockstore_init_journal::blockstore_init_journal(blockstore_impl_t *bs)
    };
 }

-void blockstore_init_journal::handle_event(ring_data_t *data1)
+void blockstore_init_journal::handle_event(ring_data_t *data)
 {
-    if (data1->res <= 0)
+    if (data->res != data->iov.iov_len)
    {
-        throw std::runtime_error(
-            std::string("read journal failed at offset ") + std::to_string(journal_pos) +
-            std::string(": ") + strerror(-data1->res)
-        );
+        throw std::runtime_error(strprintf(
+            "read journal failed at offset %ju: got %s (code %d), but expected %zu",
+            journal_pos, strerror(-data->res), data->res, data->iov.iov_len
+        ));
    }
    done.push_back({
        .buf = submitted_buf,
        .pos = journal_pos,
-        .len = (uint64_t)data1->res,
+        .len = (uint64_t)data->res,
    });
-    journal_pos += data1->res;
+    journal_pos += data->res;
    if (journal_pos >= bs->journal.len)
    {
        // Continue from the beginning
@@ -16,7 +16,9 @@ class blockstore_init_meta
    blockstore_impl_t *bs;
    int wait_state = 0;
    bool zero_on_init = false;
+    bool header_written = false;
    void *metadata_buffer = NULL;
+    blockstore_meta_header_v2_t *hdr = NULL;
    blockstore_init_meta_buf bufs[2] = {};
    int submitted = 0;
    struct io_uring_sqe *sqe;
@@ -29,7 +31,7 @@ class blockstore_init_meta
    int i = 0, j = 0;
    std::vector<uint64_t> entries_to_zero;
    bool handle_meta_block(uint8_t *buf, uint64_t count, uint64_t done_cnt);
-    void handle_event(ring_data_t *data, int buf_num);
+    void handle_event(ring_data_t *data, int buf_num, const char *op);
 public:
    blockstore_init_meta(blockstore_impl_t *bs);
    int loop();
@@ -101,8 +101,8 @@ int blockstore_impl_t::fulfill_read(blockstore_op_t *read_op,
                    .copy_flags = COPY_BUF_JOURNAL|COPY_BUF_CSUM_FILL,
                    .offset = blk_begin,
                    .len = blk_end-blk_begin,
-                    .csum_buf = (csum + (blk_begin/dsk.csum_block_size -
-                        item_start/dsk.csum_block_size) * (dsk.data_csum_type & 0xFF)),
+                    .csum_buf = (!csum ? NULL : (csum + (blk_begin/dsk.csum_block_size -
+                        item_start/dsk.csum_block_size) * (dsk.data_csum_type & 0xFF))),
                    .dyn_data = dyn_data,
                });
                if (dyn_data)
@@ -134,7 +134,7 @@ int blockstore_impl_t::fulfill_read(blockstore_op_t *read_op,
                // If we don't track it then we may IN THEORY read another object's data:
                // submit read -> remove the object -> flush remove -> overwrite with another object -> finish read
                // Very improbable, but possible
-                PRIV(read_op)->clean_block_used = 1;
+                PRIV(read_op)->clean_loc_used = UINT64_MAX;
            }
            rv.insert(rv.begin() + pos, el);
            fulfilled += el.len;
@@ -167,7 +167,8 @@ uint8_t* blockstore_impl_t::get_clean_entry_bitmap(uint64_t block_loc, int offse
 }

 int blockstore_impl_t::fill_partial_checksum_blocks(std::vector<copy_buffer_t> & rv, uint64_t & fulfilled,
-    uint8_t *clean_entry_bitmap, int *dyn_data, bool from_journal, uint8_t *read_buf, uint64_t read_offset, uint64_t read_end)
+    uint8_t *clean_entry_bitmap, int *dyn_data, bool from_journal, uint8_t *read_buf,
+    uint32_t read_offset, uint32_t read_end, uint32_t item_start, uint32_t item_end)
 {
    if (read_end == read_offset)
        return 0;
@@ -175,10 +176,38 @@ int blockstore_impl_t::fill_partial_checksum_blocks(std::vector<copy_buffer_t> &
    read_buf -= read_offset;
    uint32_t last_block = (read_end-1)/dsk.csum_block_size;
    uint32_t start_block = read_offset/dsk.csum_block_size;
+    uint32_t item_start_block = item_start/dsk.csum_block_size;
    uint32_t end_block = 0;
+    auto zero_range = [&](int pos, bool alloc, uint32_t cur_start, uint32_t cur_end)
+    {
+        if (alloc)
+            return 0;
+        copy_buffer_t el = {
+            .copy_flags = COPY_BUF_ZERO,
+            .offset = cur_start,
+            .len = cur_end-cur_start,
+        };
+        rv.insert(rv.begin() + pos, el);
+        if (read_buf)
+            memset(read_buf + el.offset - read_offset, 0, el.len);
+        fulfilled += el.len;
+        return 1;
+    };
+    if (read_offset < item_start)
+    {
+        // Zero-fill the beginning
+        find_holes(rv, read_offset, item_start, zero_range);
+        read_offset = item_start;
+    }
+    if (read_end > item_end)
+    {
+        // Zero-fill the end
+        find_holes(rv, item_end, read_end, zero_range);
+        read_end = item_end;
+    }
    while (start_block <= last_block)
    {
-        if (read_range_fulfilled(rv, fulfilled, read_buf, clean_entry_bitmap,
+        if (read_range_fulfilled(rv, fulfilled, read_buf, from_journal ? NULL : clean_entry_bitmap,
            start_block*dsk.csum_block_size < read_offset ? read_offset : start_block*dsk.csum_block_size,
            (start_block+1)*dsk.csum_block_size > read_end ? read_end : (start_block+1)*dsk.csum_block_size))
        {
@@ -190,7 +219,7 @@ int blockstore_impl_t::fill_partial_checksum_blocks(std::vector<copy_buffer_t> &
            // Find a sequence of checksum blocks required to be read
            end_block = start_block;
            while ((end_block+1)*dsk.csum_block_size < read_end &&
-                !read_range_fulfilled(rv, fulfilled, read_buf, clean_entry_bitmap,
+                !read_range_fulfilled(rv, fulfilled, read_buf, from_journal ? NULL : clean_entry_bitmap,
                    (end_block+1)*dsk.csum_block_size < read_offset ? read_offset : (end_block+1)*dsk.csum_block_size,
                    (end_block+2)*dsk.csum_block_size > read_end ? read_end : (end_block+2)*dsk.csum_block_size))
            {
@@ -202,8 +231,10 @@ int blockstore_impl_t::fill_partial_checksum_blocks(std::vector<copy_buffer_t> &
                .copy_flags = COPY_BUF_CSUM_FILL | (from_journal ? COPY_BUF_JOURNALED_BIG : 0),
                .offset = start_block*dsk.csum_block_size,
                .len = (end_block-start_block)*dsk.csum_block_size,
-                // save clean_entry_bitmap if we're reading clean data from the journal
-                .csum_buf = from_journal ? clean_entry_bitmap : NULL,
+                // save checksum reference if we're reading clean data from the journal
+                .csum_buf = from_journal
+                    ? clean_entry_bitmap + dsk.clean_entry_bitmap_size + (start_block-item_start_block)*(dsk.data_csum_type & 0xFF)
+                    : NULL,
                .dyn_data = dyn_data,
            });
            if (dyn_data)
@@ -226,6 +257,11 @@ bool blockstore_impl_t::read_range_fulfilled(std::vector<copy_buffer_t> & rv, ui
    {
        if (alloc)
            return 0;
+        if (!clean_entry_bitmap)
+        {
+            all_done = false;
+            return 0;
+        }
        int diff = 0;
        uint32_t bmp_start = cur_start/dsk.bitmap_granularity;
        uint32_t bmp_end = cur_end/dsk.bitmap_granularity;
@@ -323,7 +359,7 @@ bool blockstore_impl_t::read_checksum_block(blockstore_op_t *op, int rv_pos, uin
            {
                iov[n_iov++] = (struct iovec){ (uint8_t*)op->buf+cur_start-op->offset, lim_end-cur_start };
                rv.insert(rv.begin() + pos, (copy_buffer_t){
-                    .copy_flags = COPY_BUF_DATA,
+                    .copy_flags = COPY_BUF_DATA|COPY_BUF_COALESCED,
                    .offset = cur_start,
                    .len = lim_end-cur_start,
                });
@@ -361,10 +397,10 @@ bool blockstore_impl_t::read_checksum_block(blockstore_op_t *op, int rv_pos, uin
        PRIV(op)->pending_ops++;
        io_uring_prep_readv(sqe, submit_fd, iov + n_pos, n_cur, submit_offset + clean_loc + item_start + d_pos);
        data->callback = [this, op](ring_data_t *data) { handle_read_event(data, op); };
-        if (n_pos > 0 || n_pos + IOV_MAX < n_iov)
+        if (n_pos > 0 || n_iov > IOV_MAX)
        {
            uint32_t d_len = 0;
-            for (int i = 0; i < IOV_MAX; i++)
+            for (int i = 0; i < n_cur; i++)
                d_len += iov[n_pos+i].iov_len;
            data->iov.iov_len = d_len;
            d_pos += d_len;
@@ -376,7 +412,7 @@ bool blockstore_impl_t::read_checksum_block(blockstore_op_t *op, int rv_pos, uin
    {
        // Reads running parallel to flushes of the same clean block may read
        // a mixture of old and new data. So we don't verify checksums for such blocks.
-        PRIV(op)->clean_block_used = 1;
+        PRIV(op)->clean_loc_used = UINT64_MAX;
    }
    return true;
 }
@@ -402,7 +438,7 @@ int blockstore_impl_t::dequeue_read(blockstore_op_t *read_op)
    }
    uint64_t fulfilled = 0;
    PRIV(read_op)->pending_ops = 0;
-    PRIV(read_op)->clean_block_used = 0;
+    PRIV(read_op)->clean_loc_used = 0;
    auto & rv = PRIV(read_op)->read_vec;
    uint64_t result_version = 0;
    if (dirty_found)
@@ -515,26 +551,50 @@ int blockstore_impl_t::dequeue_read(blockstore_op_t *read_op)
    return 2;
 undo_read:
    // need to wait. undo added requests, don't dequeue op
-    if (dsk.csum_block_size > dsk.bitmap_granularity)
+    release_clean(read_op);
+    for (auto & vec: rv)
    {
-        for (auto & vec: rv)
+        if ((vec.copy_flags & COPY_BUF_CSUM_FILL) && vec.buf)
        {
-            if ((vec.copy_flags & COPY_BUF_CSUM_FILL) && vec.buf)
-            {
-                free(vec.buf);
-                vec.buf = NULL;
-            }
-            if (vec.dyn_data && --(*vec.dyn_data) == 0) // refcount
-            {
-                free(vec.dyn_data);
-                vec.dyn_data = NULL;
-            }
+            free(vec.buf);
+            vec.buf = NULL;
+        }
+        if (vec.dyn_data && --(*vec.dyn_data) == 0) // refcount
+        {
+            free(vec.dyn_data);
+            vec.dyn_data = NULL;
        }
    }
    rv.clear();
    return 0;
 }

+void blockstore_impl_t::release_clean(blockstore_op_t *op)
+{
+    if (PRIV(op)->clean_loc_used == UINT64_MAX)
+    {
+        PRIV(op)->clean_loc_used = 0;
+    }
+    if (PRIV(op)->clean_loc_used)
+    {
+        // Release clean data block
+        auto uo_it = used_clean_objects.find(PRIV(op)->clean_loc_used - 1);
+        if (uo_it != used_clean_objects.end())
+        {
+            uo_it->second.refs--;
+            if (uo_it->second.refs <= 0)
+            {
+                if (uo_it->second.was_freed)
+                {
+                    data_alloc->set((PRIV(op)->clean_loc_used - 1) / dsk.data_block_size, false);
+                }
+                used_clean_objects.erase(uo_it);
+            }
+        }
+        PRIV(op)->clean_loc_used = 0;
+    }
+}
+
 int blockstore_impl_t::pad_journal_read(std::vector<copy_buffer_t> & rv, copy_buffer_t & cp,
    // FIXME Passing dirty_entry& would be nicer
    uint64_t dirty_offset, uint64_t dirty_end, uint64_t dirty_loc, uint8_t *csum_ptr, int *dyn_data,
@@ -598,11 +658,15 @@ bool blockstore_impl_t::fulfill_clean_read(blockstore_op_t *read_op, uint64_t &
    {
        auto & rv = PRIV(read_op)->read_vec;
        int req = fill_partial_checksum_blocks(rv, fulfilled, clean_entry_bitmap, dyn_data, from_journal,
-            (uint8_t*)read_op->buf, read_op->offset, read_op->offset+read_op->len);
+            (uint8_t*)read_op->buf, read_op->offset, read_op->offset+read_op->len, item_start, item_end);
        if (!inmemory_meta && !from_journal && req > 0)
        {
            // Read checksums from disk
            uint8_t *csum_buf = read_clean_meta_block(read_op, clean_loc, rv.size()-req);
+            if (!csum_buf)
+            {
+                return false;
+            }
            for (int i = req; i > 0; i--)
            {
                rv[rv.size()-i].csum_buf = csum_buf;
@@ -615,7 +679,7 @@ bool blockstore_impl_t::fulfill_clean_read(blockstore_op_t *read_op, uint64_t &
                return false;
            }
        }
-        PRIV(read_op)->clean_block_used = req > 0;
+        PRIV(read_op)->clean_loc_used = req > 0 ? UINT64_MAX : 0;
    }
    else if (from_journal)
    {
@@ -665,6 +729,10 @@ bool blockstore_impl_t::fulfill_clean_read(blockstore_op_t *read_op, uint64_t &
                {
                    // Read checksums from disk
                    csum_buf = read_clean_meta_block(read_op, clean_loc, PRIV(read_op)->read_vec.size());
+                    if (!csum_buf)
+                    {
+                        return false;
+                    }
                    csum_done = true;
                }
                uint8_t *csum = !dsk.csum_block_size ? 0 : (csum_buf + 2*dsk.clean_entry_bitmap_size + bmp_start*(dsk.data_csum_type & 0xFF));
@@ -679,13 +747,13 @@ bool blockstore_impl_t::fulfill_clean_read(blockstore_op_t *read_op, uint64_t &
        }
    }
    // Increment reference counter if clean data is being read from the disk
-    if (PRIV(read_op)->clean_block_used)
+    if (PRIV(read_op)->clean_loc_used == UINT64_MAX)
    {
        auto & uo = used_clean_objects[clean_loc];
        uo.refs++;
        if (dsk.csum_block_size && flusher->is_mutated(clean_loc))
            uo.was_changed = true;
-        PRIV(read_op)->clean_block_used = clean_loc;
+        PRIV(read_op)->clean_loc_used = clean_loc + 1;
    }
    return true;
 }
@@ -725,12 +793,18 @@ bool blockstore_impl_t::verify_padded_checksums(uint8_t *clean_entry_bitmap, uin
        while (pos < iov[i].iov_len)
        {
            uint32_t start = pos;
-            uint8_t bit = (clean_entry_bitmap[bmp_pos >> 3] >> (bmp_pos & 0x7)) & 1;
-            while (pos < iov[i].iov_len && ((clean_entry_bitmap[bmp_pos >> 3] >> (bmp_pos & 0x7)) & 1) == bit)
+            uint8_t bit = 1;
+            if (clean_entry_bitmap)
            {
-                pos += dsk.bitmap_granularity;
-                bmp_pos++;
+                bit = (clean_entry_bitmap[bmp_pos >> 3] >> (bmp_pos & 0x7)) & 1;
+                while (pos < iov[i].iov_len && ((clean_entry_bitmap[bmp_pos >> 3] >> (bmp_pos & 0x7)) & 1) == bit)
+                {
+                    pos += dsk.bitmap_granularity;
+                    bmp_pos++;
+                }
            }
+            else
+                pos = iov[i].iov_len;
            uint32_t len = pos-start;
            auto buf = (uint8_t*)iov[i].iov_base+start;
            while (block_done+len >= dsk.csum_block_size)
@@ -807,7 +881,7 @@ bool blockstore_impl_t::verify_clean_padded_checksums(blockstore_op_t *op, uint6
 {
    uint32_t offset = clean_loc % dsk.data_block_size;
    if (from_journal)
-        return verify_padded_checksums(dyn_data, dyn_data + dsk.clean_entry_bitmap_size, offset, iov, n_iov, bad_block_cb);
+        return verify_padded_checksums(NULL, dyn_data, offset, iov, n_iov, bad_block_cb);
    clean_loc = (clean_loc / dsk.data_block_size) * dsk.data_block_size;
    if (!dyn_data)
    {
@@ -835,7 +909,7 @@ void blockstore_impl_t::handle_read_event(ring_data_t *data, blockstore_op_t *op
            void *meta_block = NULL;
            if (dsk.csum_block_size > dsk.bitmap_granularity)
            {
-                for (int i = rv.size()-1; i >= 0 && (rv[i].copy_flags & COPY_BUF_CSUM_FILL); i--)
+                for (int i = 0; i < rv.size(); i++)
                {
                    if (rv[i].copy_flags & COPY_BUF_META_BLOCK)
                    {
@@ -845,8 +919,41 @@ void blockstore_impl_t::handle_read_event(ring_data_t *data, blockstore_op_t *op
                        rv[i].buf = NULL;
                        continue;
                    }
-                    struct iovec *iov = (struct iovec*)((uint8_t*)rv[i].buf + (rv[i].len & 0xFFFFFFFF));
-                    int n_iov = rv[i].len >> 32;
+                    if (rv[i].copy_flags & COPY_BUF_ZERO)
+                    {
+                        // Zero read
+                        continue;
+                    }
+                    if (rv[i].copy_flags & COPY_BUF_COALESCED)
+                    {
+                        // Sub-block shared with another read. Skip
+                        continue;
+                    }
+                    if ((rv[i].copy_flags & COPY_BUF_JOURNAL) && journal.inmemory)
+                    {
+                        // Do not check journal checksums in-memory
+                        continue;
+                    }
+                    iovec single_iov = {};
+                    iovec *iov = NULL;
+                    int n_iov = 0;
+                    if (rv[i].copy_flags & COPY_BUF_CSUM_FILL)
+                    {
+                        // Padded, buffer list passed using a 'creepy way'
+                        iov = (struct iovec*)((uint8_t*)rv[i].buf + (rv[i].len & 0xFFFFFFFF));
+                        n_iov = rv[i].len >> 32;
+                    }
+                    else
+                    {
+                        // Not padded, buffer is fully within the input buffer
+                        assert(op->buf);
+                        assert(rv[i].csum_buf);
+                        iov = &single_iov;
+                        n_iov = 1;
+                        assert(rv[i].offset >= op->offset);
+                        assert(rv[i].offset + rv[i].len <= op->offset + op->len);
+                        single_iov = { .iov_base = op->buf + rv[i].offset - op->offset, .iov_len = rv[i].len };
+                    }
                    bool ok = true;
                    if (rv[i].copy_flags & COPY_BUF_JOURNAL)
                    {
@@ -944,23 +1051,7 @@ void blockstore_impl_t::handle_read_event(ring_data_t *data, blockstore_op_t *op
                meta_block = NULL;
            }
        }
-        if (PRIV(op)->clean_block_used)
-        {
-            // Release clean data block
-            auto uo_it = used_clean_objects.find(PRIV(op)->clean_block_used);
-            if (uo_it != used_clean_objects.end())
-            {
-                uo_it->second.refs--;
-                if (uo_it->second.refs <= 0)
-                {
-                    if (uo_it->second.was_freed)
-                    {
-                        data_alloc->set(PRIV(op)->clean_block_used, false);
-                    }
-                    used_clean_objects.erase(uo_it);
-                }
-            }
-        }
+        release_clean(op);
        if (!journal.inmemory)
        {
            // Release journal sector usage
@@ -491,7 +491,7 @@ void blockstore_impl_t::mark_stable(obj_ver_id v, bool forget_dirty)
                    if (!exists)
                    {
                        uint64_t space_id = dirty_it->first.oid.inode;
-                        if (no_inode_stats[dirty_it->first.oid.inode >> (64-POOL_ID_BITS)])
+                        if (no_inode_stats.find(dirty_it->first.oid.inode >> (64-POOL_ID_BITS)) != no_inode_stats.end())
                            space_id = space_id & ~(((uint64_t)1 << (64-POOL_ID_BITS)) - 1);
                        inode_space_stats[space_id] += dsk.data_block_size;
                        used_blocks++;
@@ -501,7 +501,7 @@ void blockstore_impl_t::mark_stable(obj_ver_id v, bool forget_dirty)
                else if (IS_DELETE(dirty_it->second.state))
                {
                    uint64_t space_id = dirty_it->first.oid.inode;
-                    if (no_inode_stats[dirty_it->first.oid.inode >> (64-POOL_ID_BITS)])
+                    if (no_inode_stats.find(dirty_it->first.oid.inode >> (64-POOL_ID_BITS)) != no_inode_stats.end())
                        space_id = space_id & ~(((uint64_t)1 << (64-POOL_ID_BITS)) - 1);
                    auto & sp = inode_space_stats[space_id];
                    if (sp > dsk.data_block_size)
@@ -3,6 +3,22 @@ cmake_minimum_required(VERSION 2.8...3.30)
 project(vitastor)

 # libvitastor_common.a
+add_library(vitastor_common STATIC
+	etcd_state_client.cpp
+	msgr_stop.cpp
+	msgr_op.cpp
+	../../json11/json11.cpp
+	osd_ops.cpp
+	pg_states.cpp
+	../util/allocator.cpp
+	../util/addr_util.cpp
+	../util/timerfd_manager.cpp
+	../util/str_util.cpp
+	../util/json_util.cpp
+)
+target_compile_options(vitastor_common PUBLIC -fPIC)
+
+# libvitastor_net.a
 set(MSGR_RDMA "")
 if (IBVERBS_LIBRARIES)
 	set(MSGR_RDMA "msgr_rdma.cpp")
@@ -11,24 +27,32 @@ set(MSGR_RDMACM "")
 if (RDMACM_LIBRARIES)
 	set(MSGR_RDMACM "msgr_rdmacm.cpp")
 endif (RDMACM_LIBRARIES)
-add_library(vitastor_common STATIC
-	../util/epoll_manager.cpp etcd_state_client.cpp messenger.cpp msgr_iothread.cpp ../util/addr_util.cpp
-	msgr_stop.cpp msgr_op.cpp msgr_send.cpp msgr_receive.cpp ../util/ringloop.cpp ../../json11/json11.cpp
-	http_client.cpp osd_ops.cpp pg_states.cpp ../util/timerfd_manager.cpp ../util/str_util.cpp ../util/json_util.cpp ${MSGR_RDMA} ${MSGR_RDMACM}
+add_library(vitastor_net STATIC
+	../util/epoll_manager.cpp
+	etcd_state_client_http.cpp
+	messenger.cpp
+	msgr_iothread.cpp
+	msgr_send.cpp
+	msgr_receive.cpp
+	../util/ringloop.cpp
+	http_client.cpp
+	${MSGR_RDMA}
+	${MSGR_RDMACM}
 )
-target_link_libraries(vitastor_common pthread)
-target_compile_options(vitastor_common PUBLIC -fPIC)
+target_link_libraries(vitastor_net pthread vitastor_common)
+target_compile_options(vitastor_net PUBLIC -fPIC)

 # libvitastor_client.so
 add_library(vitastor_client SHARED
 	cluster_client.cpp
+	cluster_client_real.cpp
 	cluster_client_list.cpp
 	cluster_client_wb.cpp
 	vitastor_c.cpp
 )
 set_target_properties(vitastor_client PROPERTIES PUBLIC_HEADER "client/vitastor_c.h")
 target_link_libraries(vitastor_client
-	vitastor_common
+	vitastor_net
 	vitastor_cli
 	${LIBURING_LIBRARIES}
 	${IBVERBS_LIBRARIES}
@@ -95,11 +119,13 @@ endif (${WITH_QEMU})
 add_executable(test_cluster_client
 	EXCLUDE_FROM_ALL
 	../test/test_cluster_client.cpp
-	pg_states.cpp osd_ops.cpp cluster_client.cpp cluster_client_list.cpp cluster_client_wb.cpp msgr_op.cpp ../test/mock/messenger.cpp msgr_stop.cpp
-	etcd_state_client.cpp ../util/timerfd_manager.cpp ../util/addr_util.cpp ../util/str_util.cpp ../util/json_util.cpp ../../json11/json11.cpp
+	cluster_client.cpp
+	cluster_client_list.cpp
+	cluster_client_wb.cpp
+	../test/mock/messenger.cpp
+	etcd_state_client_mock.cpp
 )
-target_link_libraries(test_cluster_client ${LIBURING_LIBRARIES})
-target_compile_definitions(test_cluster_client PUBLIC -D__MOCK__)
+target_link_libraries(test_cluster_client vitastor_common ${LIBURING_LIBRARIES})
 target_include_directories(test_cluster_client BEFORE PUBLIC ${CMAKE_SOURCE_DIR}/src/test/mock)
 add_dependencies(build_tests test_cluster_client)
 add_test(NAME test_cluster_client COMMAND test_cluster_client)
@@ -11,7 +11,7 @@
 #define TRY_SEND_CONNECTING 1
 #define TRY_SEND_OK 2

-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, std::unique_ptr<etcd_state_client_t> st_cli_ptr)
 {
    wb = new writeback_cache_t();

@@ -53,23 +53,23 @@ cluster_client_t::cluster_client_t(ring_loop_t *ringloop, timerfd_manager_t *tfd
    };
    msgr.parse_config(config);

-    st_cli.tfd = tfd;
-    st_cli.on_load_config_hook = [this](json11::Json::object & cfg) { on_load_config_hook(cfg); };
-    st_cli.on_change_osd_state_hook = [this](uint64_t peer_osd) { on_change_osd_state_hook(peer_osd); };
-    st_cli.on_change_pool_config_hook = [this]() { on_change_pool_config_hook(); };
-    st_cli.on_change_pg_config_hook = [this]() { on_change_pool_config_hook(); };
-    st_cli.on_change_pg_state_hook = [this](pool_id_t pool_id, pg_num_t pg_num, osd_num_t prev_primary) { on_change_pg_state_hook(pool_id, pg_num, prev_primary); };
-    st_cli.on_change_node_placement_hook = [this]() { on_change_node_placement_hook(); };
-    st_cli.on_load_pgs_hook = [this](bool success) { on_load_pgs_hook(success); };
-    st_cli.on_reload_hook = [this]() { st_cli.load_global_config(); };
+    st_cli = std::move(st_cli_ptr);
+    st_cli->on_load_config_hook = [this](json11::Json::object & cfg) { on_load_config_hook(cfg); };
+    st_cli->on_change_osd_state_hook = [this](uint64_t peer_osd) { on_change_osd_state_hook(peer_osd); };
+    st_cli->on_change_pool_config_hook = [this]() { on_change_pool_config_hook(); };
+    st_cli->on_change_pg_config_hook = [this]() { on_change_pool_config_hook(); };
+    st_cli->on_change_pg_state_hook = [this](pool_id_t pool_id, pg_num_t pg_num, osd_num_t prev_primary) { on_change_pg_state_hook(pool_id, pg_num, prev_primary); };
+    st_cli->on_change_node_placement_hook = [this]() { on_change_node_placement_hook(); };
+    st_cli->on_load_pgs_hook = [this](bool success) { on_load_pgs_hook(success); };
+    st_cli->on_reload_hook = [this]() { this->st_cli->load_global_config(); };

-    st_cli.parse_config(config);
-    st_cli.infinite_start = false;
+    st_cli->parse_config(config);
+    st_cli->infinite_start = false;
    if (!config["client_infinite_start"].is_null())
    {
-        st_cli.infinite_start = config["client_infinite_start"].bool_value();
+        st_cli->infinite_start = config["client_infinite_start"].bool_value();
    }
-    st_cli.load_global_config();
+    st_cli->load_global_config();

    scrap_buffer_size = SCRAP_BUFFER_SIZE;
    scrap_buffer = malloc_or_die(scrap_buffer_size);
@@ -469,7 +469,7 @@ void cluster_client_t::on_load_config_hook(json11::Json::object & etcd_global_co
        auto etcd_report_interval = config["etcd_report_interval"].uint64_value();
        if (!etcd_report_interval)
            etcd_report_interval = 5;
-        client_wait_up_timeout = 1+etcd_report_interval+(st_cli.max_etcd_attempts*(2*st_cli.etcd_quick_timeout)+999)/1000;
+        client_wait_up_timeout = 1+etcd_report_interval+(st_cli->max_etcd_attempts*(2*st_cli->etcd_quick_timeout)+999)/1000;
    }
    // log_level
    log_level = config["log_level"].uint64_value();
@@ -482,8 +482,8 @@ void cluster_client_t::on_load_config_hook(json11::Json::object & etcd_global_co
        client_hostname = new_hostname;
    }
    msgr.parse_config(config);
-    st_cli.parse_config(config);
-    st_cli.load_pgs();
+    st_cli->parse_config(config);
+    st_cli->load_pgs();
 }

 osd_num_t cluster_client_t::select_random_osd(const std::vector<osd_num_t> & osds)
@@ -492,7 +492,7 @@ osd_num_t cluster_client_t::select_random_osd(const std::vector<osd_num_t> & osd
    int alive_count = 0;
    for (auto & osd_num: osds)
    {
-        if (!st_cli.peer_states[osd_num].is_null())
+        if (!st_cli->peer_states[osd_num].is_null())
            alive_set[alive_count++] = osd_num;
    }
    if (!alive_count)
@@ -509,7 +509,7 @@ osd_num_t cluster_client_t::select_nearest_osd(const std::vector<osd_num_t> & os
        while (self_tree_metrics.find(cur_id) == self_tree_metrics.end())
        {
            self_tree_metrics[cur_id] = metric++;
-            json11::Json cur_placement = st_cli.node_placement[cur_id];
+            json11::Json cur_placement = st_cli->node_placement[cur_id];
            cur_id = cur_placement["parent"].string_value();
        }
        if (cur_id != "")
@@ -529,7 +529,7 @@ osd_num_t cluster_client_t::select_nearest_osd(const std::vector<osd_num_t> & os
        }
        else
        {
-            auto & peer_state = st_cli.peer_states[osd_num];
+            auto & peer_state = st_cli->peer_states[osd_num];
            if (!peer_state.is_null())
            {
                metric = self_tree_metrics[""];
@@ -539,7 +539,7 @@ osd_num_t cluster_client_t::select_nearest_osd(const std::vector<osd_num_t> & os
                while (seen.find(cur_id) == seen.end())
                {
                    seen.insert(cur_id);
-                    json11::Json cur_placement = st_cli.node_placement[cur_id];
+                    json11::Json cur_placement = st_cli->node_placement[cur_id];
                    std::string cur_parent = cur_placement["parent"].string_value();
                    cur_id = (!first || cur_parent != "" ? cur_parent : peer_state["host"].string_value());
                    first = false;
@@ -564,7 +564,7 @@ osd_num_t cluster_client_t::select_nearest_osd(const std::vector<osd_num_t> & os

 void cluster_client_t::on_load_pgs_hook(bool success)
 {
-    for (auto & pool_item: st_cli.pool_config)
+    for (auto & pool_item: st_cli->pool_config)
    {
        pg_counts[pool_item.first] = pool_item.second.real_pg_count;
    }
@@ -584,7 +584,7 @@ void cluster_client_t::on_load_pgs_hook(bool success)

 void cluster_client_t::on_change_pool_config_hook()
 {
-    for (auto & pool_item: st_cli.pool_config)
+    for (auto & pool_item: st_cli->pool_config)
    {
        if (pg_counts[pool_item.first] != pool_item.second.real_pg_count)
        {
@@ -612,7 +612,7 @@ void cluster_client_t::on_change_pool_config_hook()

 void cluster_client_t::on_change_pg_state_hook(pool_id_t pool_id, pg_num_t pg_num, osd_num_t prev_primary)
 {
-    auto & pg_cfg = st_cli.pool_config[pool_id].pg_config[pg_num];
+    auto & pg_cfg = st_cli->pool_config[pool_id].pg_config[pg_num];
    if (pg_cfg.cur_primary != prev_primary)
    {
        // Repeat this PG operations because an OSD which stopped being primary may not fsync operations
@@ -630,8 +630,8 @@ bool cluster_client_t::get_immediate_commit(uint64_t inode)
    pool_id_t pool_id = INODE_POOL(inode);
    if (!pool_id)
        return true;
-    auto pool_it = st_cli.pool_config.find(pool_id);
-    if (pool_it == st_cli.pool_config.end())
+    auto pool_it = st_cli->pool_config.find(pool_id);
+    if (pool_it == st_cli->pool_config.end())
        return true;
    return pool_it->second.immediate_commit == IMMEDIATE_ALL;
 }
@@ -641,7 +641,7 @@ void cluster_client_t::on_change_osd_state_hook(uint64_t peer_osd)
    osd_tree_metrics.erase(peer_osd);
    if (msgr.wanted_peers.find(peer_osd) != msgr.wanted_peers.end())
    {
-        msgr.connect_peer(peer_osd, st_cli.peer_states[peer_osd]);
+        msgr.connect_peer(peer_osd, st_cli->peer_states[peer_osd]);
        continue_lists();
    }
 }
@@ -936,8 +936,8 @@ bool cluster_client_t::check_rw(cluster_op_t *op)
        cb(op);
        return false;
    }
-    auto pool_it = st_cli.pool_config.find(pool_id);
-    if (pool_it == st_cli.pool_config.end() || pool_it->second.real_pg_count == 0)
+    auto pool_it = st_cli->pool_config.find(pool_id);
+    if (pool_it == st_cli->pool_config.end() || pool_it->second.real_pg_count == 0)
    {
        // Pools are loaded, but this one is unknown
        op->retval = -EINVAL;
@@ -960,8 +960,8 @@ bool cluster_client_t::check_rw(cluster_op_t *op)
    }
    if ((op->opcode == OSD_OP_WRITE || op->opcode == OSD_OP_DELETE) && !(op->flags & OSD_OP_IGNORE_READONLY))
    {
-        auto ino_it = st_cli.inode_config.find(op->inode);
-        if (ino_it != st_cli.inode_config.end() && ino_it->second.readonly)
+        auto ino_it = st_cli->inode_config.find(op->inode);
+        if (ino_it != st_cli->inode_config.end() && ino_it->second.readonly)
        {
            op->retval = -EROFS;
            auto cb = std::move(op->callback);
@@ -972,15 +972,15 @@ bool cluster_client_t::check_rw(cluster_op_t *op)
    op->deoptimise_snapshot = false;
    if (enable_writeback && (op->opcode == OSD_OP_READ || op->opcode == OSD_OP_READ_BITMAP || op->opcode == OSD_OP_READ_CHAIN_BITMAP))
    {
-        auto ino_it = st_cli.inode_config.find(op->inode);
-        if (ino_it != st_cli.inode_config.end())
+        auto ino_it = st_cli->inode_config.find(op->inode);
+        if (ino_it != st_cli->inode_config.end())
        {
            int chain_size = 0;
-            while (ino_it != st_cli.inode_config.end() && ino_it->second.parent_id)
+            while (ino_it != st_cli->inode_config.end() && ino_it->second.parent_id)
            {
                // Check for loops - FIXME check it in etcd_state_client
                if (ino_it->second.parent_id == op->inode ||
-                    chain_size > st_cli.inode_config.size())
+                    chain_size > st_cli->inode_config.size())
                {
                    op->retval = -EINVAL;
                    auto cb = std::move(op->callback);
@@ -995,7 +995,7 @@ bool cluster_client_t::check_rw(cluster_op_t *op)
                    break;
                }
                chain_size++;
-                ino_it = st_cli.inode_config.find(ino_it->second.parent_id);
+                ino_it = st_cli->inode_config.find(ino_it->second.parent_id);
            }
        }
    }
@@ -1014,7 +1014,7 @@ void cluster_client_t::execute_raw(osd_num_t osd_num, osd_op_t *op)
    else
    {
        if (msgr.wanted_peers.find(osd_num) == msgr.wanted_peers.end())
-            msgr.connect_peer(osd_num, st_cli.peer_states[osd_num]);
+            msgr.connect_peer(osd_num, st_cli->peer_states[osd_num]);
        raw_ops.emplace(osd_num, op);
    }
 }
@@ -1129,25 +1129,25 @@ resume_2:
        if (op->opcode == OSD_OP_READ || op->opcode == OSD_OP_READ_CHAIN_BITMAP)
        {
            // Check parent inode
-            auto ino_it = st_cli.inode_config.find(op->cur_inode);
+            auto ino_it = st_cli->inode_config.find(op->cur_inode);
            // Skip parents from the same pool
            int skipped = 0;
            while (!op->deoptimise_snapshot &&
-                ino_it != st_cli.inode_config.end() && ino_it->second.parent_id &&
+                ino_it != st_cli->inode_config.end() && ino_it->second.parent_id &&
                INODE_POOL(ino_it->second.parent_id) == INODE_POOL(op->cur_inode))
            {
                // Check for loops - FIXME check it in etcd_state_client
                if (ino_it->second.parent_id == op->inode ||
-                    skipped > st_cli.inode_config.size())
+                    skipped > st_cli->inode_config.size())
                {
                    op->retval = -EINVAL;
                    erase_op(op);
                    return 1;
                }
                skipped++;
-                ino_it = st_cli.inode_config.find(ino_it->second.parent_id);
+                ino_it = st_cli->inode_config.find(ino_it->second.parent_id);
            }
-            if (ino_it != st_cli.inode_config.end() &&
+            if (ino_it != st_cli->inode_config.end() &&
                ino_it->second.parent_id &&
                ino_it->second.parent_id != op->inode)
            {
@@ -1161,7 +1161,7 @@ resume_2:
        op->retval = op->len;
        if (op->opcode == OSD_OP_READ_BITMAP || op->opcode == OSD_OP_READ_CHAIN_BITMAP)
        {
-            auto & pool_cfg = st_cli.pool_config.at(INODE_POOL(op->inode));
+            auto & pool_cfg = st_cli->pool_config.at(INODE_POOL(op->inode));
            op->retval = op->len / pool_cfg.bitmap_granularity;
        }
        if (op->flush_id)
@@ -1247,7 +1247,7 @@ void cluster_client_t::slice_rw(cluster_op_t *op)
 {
    // Slice the request into individual object stripe requests
    // Primary OSDs still operate individual stripes, but their size is multiplied by PG minsize in case of EC
-    auto & pool_cfg = st_cli.pool_config.at(INODE_POOL(op->cur_inode));
+    auto & pool_cfg = st_cli->pool_config.at(INODE_POOL(op->cur_inode));
    uint32_t pg_data_size = (pool_cfg.scheme == POOL_SCHEME_REPLICATED ? 1 : pool_cfg.pg_size-pool_cfg.parity_chunks);
    uint64_t pg_block_size = pool_cfg.data_block_size * pg_data_size;
    uint64_t first_stripe = (op->offset / pg_block_size) * pg_block_size;
@@ -1346,7 +1346,7 @@ bool cluster_client_t::affects_pg(uint64_t inode, uint64_t offset, uint64_t len,
    {
        return false;
    }
-    auto & pool_cfg = st_cli.pool_config.at(INODE_POOL(inode));
+    auto & pool_cfg = st_cli->pool_config.at(INODE_POOL(inode));
    uint32_t pg_data_size = (pool_cfg.scheme == POOL_SCHEME_REPLICATED ? 1 : pool_cfg.pg_size-pool_cfg.parity_chunks);
    uint64_t pg_block_size = pool_cfg.data_block_size * pg_data_size;
    uint64_t first_stripe = (offset / pg_block_size) * pg_block_size;
@@ -1365,7 +1365,7 @@ bool cluster_client_t::affects_pg(uint64_t inode, uint64_t offset, uint64_t len,

 bool cluster_client_t::affects_osd(uint64_t inode, uint64_t offset, uint64_t len, osd_num_t osd)
 {
-    auto & pool_cfg = st_cli.pool_config.at(INODE_POOL(inode));
+    auto & pool_cfg = st_cli->pool_config.at(INODE_POOL(inode));
    uint32_t pg_data_size = (pool_cfg.scheme == POOL_SCHEME_REPLICATED ? 1 : pool_cfg.pg_size-pool_cfg.parity_chunks);
    uint64_t pg_block_size = pool_cfg.data_block_size * pg_data_size;
    uint64_t first_stripe = (offset / pg_block_size) * pg_block_size;
@@ -1389,7 +1389,7 @@ int cluster_client_t::try_send(cluster_op_t *op, int i, std::function<void(osd_o
        init_msgr();
    }
    auto part = &op->parts[i];
-    auto & pool_cfg = st_cli.pool_config.at(INODE_POOL(op->cur_inode));
+    auto & pool_cfg = st_cli->pool_config.at(INODE_POOL(op->cur_inode));
    auto pg_it = pool_cfg.pg_config.find(part->pg_num);
    if (pg_it != pool_cfg.pg_config.end() &&
        !pg_it->second.pause && pg_it->second.cur_primary &&
@@ -1420,8 +1420,8 @@ int cluster_client_t::try_send(cluster_op_t *op, int i, std::function<void(osd_o
            uint64_t meta_rev = 0;
            if (op->opcode != OSD_OP_READ_BITMAP && op->opcode != OSD_OP_DELETE && !op->deoptimise_snapshot)
            {
-                auto ino_it = st_cli.inode_config.find(op->cur_inode);
-                if (ino_it != st_cli.inode_config.end())
+                auto ino_it = st_cli->inode_config.find(op->cur_inode);
+                if (ino_it != st_cli->inode_config.end())
                    meta_rev = ino_it->second.mod_revision;
            }
            part->op = (osd_op_t){
@@ -1453,7 +1453,7 @@ int cluster_client_t::try_send(cluster_op_t *op, int i, std::function<void(osd_o
        }
        else if (msgr.wanted_peers.find(primary_osd) == msgr.wanted_peers.end())
        {
-            msgr.connect_peer(primary_osd, st_cli.peer_states[primary_osd]);
+            msgr.connect_peer(primary_osd, st_cli->peer_states[primary_osd]);
            return TRY_SEND_CONNECTING;
        }
    }
@@ -1648,7 +1648,7 @@ void cluster_client_t::handle_op_part(cluster_op_part_t *part)
 void cluster_client_t::copy_part_bitmap(cluster_op_t *op, cluster_op_part_t *part)
 {
    // Copy (OR) bitmap
-    auto & pool_cfg = st_cli.pool_config.at(INODE_POOL(op->cur_inode));
+    auto & pool_cfg = st_cli->pool_config.at(INODE_POOL(op->cur_inode));
    uint32_t pg_block_size = pool_cfg.data_block_size * (
        pool_cfg.scheme == POOL_SCHEME_REPLICATED ? 1 : pool_cfg.pg_size-pool_cfg.parity_chunks
    );
@@ -4,7 +4,7 @@
 #pragma once

 #include "messenger.h"
-#include "etcd_state_client.h"
+#include "etcd_state_client_http.h"

 #define DEFAULT_CLIENT_MAX_DIRTY_BYTES 32*1024*1024
 #define DEFAULT_CLIENT_MAX_DIRTY_OPS 1024
@@ -131,7 +131,7 @@ class __attribute__((visibility("default"))) cluster_client_t
    bool msgr_initialized = false;

 public:
-    etcd_state_client_t st_cli;
+    std::unique_ptr<etcd_state_client_t> st_cli;

    osd_messenger_t msgr;
    void init_msgr();
@@ -139,7 +139,8 @@ 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);
+    static cluster_client_t* create(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, std::unique_ptr<etcd_state_client_t> st_cli);
    ~cluster_client_t();
    void execute(cluster_op_t *op);
    void execute_raw(osd_num_t osd_num, osd_op_t *op);
@@ -63,14 +63,14 @@ void cluster_client_t::list_inode(inode_t inode, uint64_t min_offset, uint64_t m
 {
    init_msgr();
    pool_id_t pool_id = INODE_POOL(inode);
-    if (!pool_id || st_cli.pool_config.find(pool_id) == st_cli.pool_config.end())
+    if (!pool_id || st_cli->pool_config.find(pool_id) == st_cli->pool_config.end())
    {
        if (log_level > 0)
            fprintf(stderr, "Pool %u does not exist\n", pool_id);
        pg_callback(-EINVAL, 0, 0, std::set<object_id>());
        return;
    }
-    auto pg_stripe_size = st_cli.pool_config.at(pool_id).pg_stripe_size;
+    auto pg_stripe_size = st_cli->pool_config.at(pool_id).pg_stripe_size;
    if (min_offset)
        min_offset = (min_offset/pg_stripe_size) * pg_stripe_size;
    inode_list_t *lst = new inode_list_t();
@@ -110,13 +110,13 @@ bool cluster_client_t::continue_listing(inode_list_t *lst)

 bool cluster_client_t::restart_listing(inode_list_t* lst)
 {
-    auto pool_it = st_cli.pool_config.find(lst->pool_id);
+    auto pool_it = st_cli->pool_config.find(lst->pool_id);
    // We want listing to be consistent. To achieve it we should:
    // 1) retry listing of each PG if its state changes
    // 2) abort listing if PG count changes during listing
    // 3) ideally, only talk to the primary OSD - this will be done separately
    // So first we add all PGs without checking their state
-    if (pool_it == st_cli.pool_config.end() ||
+    if (pool_it == st_cli->pool_config.end() ||
        lst->real_pg_count != pool_it->second.real_pg_count)
    {
        for (auto pg: lst->pgs)
@@ -136,7 +136,7 @@ bool cluster_client_t::restart_listing(inode_list_t* lst)
            fprintf(stderr, "PG count in pool %u changed during listing\n", lst->pool_id);
        }
        lst->pgs.clear();
-        if (pool_it == st_cli.pool_config.end())
+        if (pool_it == st_cli->pool_config.end())
        {
            // Unknown pool
            lst->callback(-EINVAL, 0, 0, std::set<object_id>());
@@ -248,7 +248,7 @@ void cluster_client_t::set_list_retry_timeout(int ms, timespec new_time)

 int cluster_client_t::start_pg_listing(inode_list_pg_t *pg)
 {
-    auto & pool_cfg = st_cli.pool_config.at(pg->lst->pool_id);
+    auto & pool_cfg = st_cli->pool_config.at(pg->lst->pool_id);
    auto pg_it = pool_cfg.pg_config.find(pg->pg_num);
    assert(pg->lst->real_pg_count == pool_cfg.real_pg_count);
    if (pg_it == pool_cfg.pg_config.end() ||
@@ -277,7 +277,7 @@ int cluster_client_t::start_pg_listing(inode_list_pg_t *pg)
        for (auto peer_it = all_peers.begin(); peer_it != all_peers.end(); )
        {
            if (*peer_it != pg_it->second.cur_primary &&
-                st_cli.peer_states[*peer_it].is_null())
+                st_cli->peer_states[*peer_it].is_null())
            {
                pg->inactive_osds.push_back(*peer_it);
                all_peers.erase(peer_it++);
@@ -298,11 +298,11 @@ int cluster_client_t::start_pg_listing(inode_list_pg_t *pg)
        if (msgr.osd_peers.find(peer_osd) == msgr.osd_peers.end())
        {
            // Initiate connection
-            if (st_cli.peer_states[peer_osd].is_null())
+            if (st_cli->peer_states[peer_osd].is_null())
            {
                return LIST_PG_WAIT_ACTIVE;
            }
-            msgr.connect_peer(peer_osd, st_cli.peer_states[peer_osd]);
+            msgr.connect_peer(peer_osd, st_cli->peer_states[peer_osd]);
            conn = false;
        }
    }
@@ -336,7 +336,7 @@ void cluster_client_t::send_list(inode_list_osd_t *cur_list)
    if (!cur_list->pg->inflight_ops)
        cur_list->pg->lst->inflight_pgs++;
    cur_list->pg->inflight_ops++;
-    auto & pool_cfg = st_cli.pool_config[cur_list->pg->lst->pool_id];
+    auto & pool_cfg = st_cli->pool_config[cur_list->pg->lst->pool_id];
    osd_op_t *op = new osd_op_t();
    op->op_type = OSD_OP_OUT;
    // Already checked that it exists above, but anyway
@@ -0,0 +1,11 @@
+// Copyright (c) Vitaliy Filippov, 2019+
+// License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
+
+#include "cluster_client.h"
+#include "etcd_state_client_http.h"
+
+cluster_client_t* cluster_client_t::create(ring_loop_t *ringloop, timerfd_manager_t *tfd, json11::Json config)
+{
+    auto st_cli = new etcd_state_client_http_t(tfd);
+    return new cluster_client_t(ringloop, tfd, config, std::unique_ptr<etcd_state_client_t>(st_cli));
+}
@@ -131,6 +131,7 @@ void writeback_cache_t::copy_write(cluster_op_t *op, int state, uint64_t new_flu
                        writeback_bytes -= op->len;
                    }
                    writeback_queue_size++;
+                    writeback_queue.push_back({ op->inode, new_end });
                }
                break;
            }
@@ -165,6 +166,7 @@ void writeback_cache_t::copy_write(cluster_op_t *op, int state, uint64_t new_flu
                {
                    writeback_queue_size++;
                }
+                writeback_queue.push_back({ op->inode, new_end });
            }
            auto new_dirty_it = dirty_buffers.emplace_hint(dirty_it, (object_id){
                .inode = op->inode,
@@ -1,13 +1,12 @@
 // Copyright (c) Vitaliy Filippov, 2019+
 // License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)

+#include <assert.h>
+
 #include "osd_ops.h"
 #include "pg_states.h"
 #include "etcd_state_client.h"
-#ifndef __MOCK__
 #include "addr_util.h"
-#include "http_client.h"
-#endif
 #include "str_util.h"

 etcd_state_client_t::~etcd_state_client_t()
@@ -17,28 +16,8 @@ etcd_state_client_t::~etcd_state_client_t()
        delete watch;
    }
    watches.clear();
-    etcd_watches_initialised = -1;
-#ifndef __MOCK__
-    stop_ws_keepalive();
-    if (etcd_watch_ws)
-    {
-        http_close(etcd_watch_ws);
-        etcd_watch_ws = NULL;
-    }
-    if (keepalive_client)
-    {
-        http_close(keepalive_client);
-        keepalive_client = NULL;
-    }
-#endif
-    if (load_pgs_timer_id >= 0)
-    {
-        tfd->clear_timer(load_pgs_timer_id);
-        load_pgs_timer_id = -1;
-    }
 }

-#ifndef __MOCK__
 etcd_kv_t etcd_state_client_t::parse_etcd_kv(const json11::Json & kv_json)
 {
    etcd_kv_t kv;
@@ -72,104 +51,6 @@ std::vector<std::string> etcd_state_client_t::get_addresses()
    return addrs;
 }

-void etcd_state_client_t::etcd_call_oneshot(std::string etcd_address, std::string api, json11::Json payload,
-    int timeout, std::function<void(std::string, json11::Json)> callback)
-{
-    std::string etcd_api_path;
-    int pos = etcd_address.find('/');
-    if (pos >= 0)
-    {
-        etcd_api_path = etcd_address.substr(pos);
-        etcd_address = etcd_address.substr(0, pos);
-    }
-    std::string req = payload.dump();
-    req = "POST "+etcd_api_path+api+" HTTP/1.1\r\n"
-        "Host: "+etcd_address+"\r\n"
-        "Content-Type: application/json\r\n"
-        "Content-Length: "+std::to_string(req.size())+"\r\n"
-        "Connection: close\r\n"
-        "\r\n"+req;
-    auto http_cli = http_init(tfd);
-    auto cb = [http_cli, callback](const http_response_t *response)
-    {
-        std::string err;
-        json11::Json data;
-        response->parse_json_response(err, data);
-        callback(err, data);
-        http_close(http_cli);
-    };
-    http_request(http_cli, etcd_address, req, { .timeout = timeout }, cb);
-}
-
-void etcd_state_client_t::etcd_call(std::string api, json11::Json payload, int timeout,
-    int retries, int interval, std::function<void(std::string, json11::Json)> callback)
-{
-    if (!etcd_addresses.size() && !etcd_local.size())
-    {
-        fprintf(stderr, "etcd_address is missing in Vitastor configuration\n");
-        exit(1);
-    }
-    pick_next_etcd();
-    std::string etcd_address = selected_etcd_address;
-    std::string etcd_api_path;
-    int pos = etcd_address.find('/');
-    if (pos >= 0)
-    {
-        etcd_api_path = etcd_address.substr(pos);
-        etcd_address = etcd_address.substr(0, pos);
-    }
-    std::string req = payload.dump();
-    req = "POST "+etcd_api_path+api+" HTTP/1.1\r\n"
-        "Host: "+etcd_address+"\r\n"
-        "Content-Type: application/json\r\n"
-        "Content-Length: "+std::to_string(req.size())+"\r\n"
-        "Connection: keep-alive\r\n"
-        "Keep-Alive: timeout="+std::to_string(etcd_keepalive_timeout)+"\r\n"
-        "\r\n"+req;
-    retries--;
-    auto cb = [this, api, payload, timeout, retries, interval, callback,
-        cur_addr = selected_etcd_address](const http_response_t *response)
-    {
-        std::string err;
-        json11::Json data;
-        response->parse_json_response(err, data);
-        if (err != "")
-        {
-            if (cur_addr == selected_etcd_address)
-                selected_etcd_address = "";
-            if (retries > 0)
-            {
-                if (this->log_level > 0)
-                {
-                    fprintf(
-                        stderr, "Warning: etcd request failed: %s, retrying %d more times\n",
-                        err.c_str(), retries
-                    );
-                }
-                if (interval > 0)
-                {
-                    // FIXME: Prevent destruction of etcd_state_client if timers or requests are active
-                    tfd->set_timer(interval, false, [this, api, payload, timeout, retries, interval, callback](int)
-                    {
-                        etcd_call(api, payload, timeout, retries, interval, callback);
-                    });
-                }
-                else
-                    etcd_call(api, payload, timeout, retries, interval, callback);
-            }
-            else
-                callback(err, data);
-        }
-        else
-            callback(err, data);
-    };
-    if (!keepalive_client)
-    {
-        keepalive_client = http_init(tfd);
-    }
-    http_request(keepalive_client, etcd_address, req, { .timeout = timeout, .keepalive = true }, cb);
-}
-
 void etcd_state_client_t::add_etcd_url(std::string addr)
 {
    if (addr.length() > 0)
@@ -256,7 +137,6 @@ void etcd_state_client_t::parse_config(const json11::Json & config)
        if (this->etcd_keepalive_timeout < 30)
            this->etcd_keepalive_timeout = 30;
    }
-    auto old_etcd_ws_keepalive_interval = this->etcd_ws_keepalive_interval;
    this->etcd_ws_keepalive_interval = config["etcd_ws_keepalive_interval"].uint64_value();
    if (this->etcd_ws_keepalive_interval <= 0)
    {
@@ -282,294 +162,9 @@ void etcd_state_client_t::parse_config(const json11::Json & config)
    {
        this->etcd_min_reload_interval = 50;
    }
-    if (this->etcd_ws_keepalive_interval != old_etcd_ws_keepalive_interval && ws_keepalive_timer >= 0)
-    {
-#ifndef __MOCK__
-        stop_ws_keepalive();
-        start_ws_keepalive();
-#endif
-    }
 }

-void etcd_state_client_t::pick_next_etcd()
-{
-    if (selected_etcd_address != "")
-        return;
-    if (addresses_to_try.size() == 0)
-    {
-        // Prefer local etcd, if any
-        for (int i = 0; i < etcd_local.size(); i++)
-            addresses_to_try.push_back(etcd_local[i]);
-        std::vector<int> ns;
-        for (int i = 0; i < etcd_addresses.size(); i++)
-            ns.push_back(i);
-        if (!rand_initialized)
-        {
-            timespec tv;
-            clock_gettime(CLOCK_REALTIME, &tv);
-            srand48(tv.tv_sec*1000000000 + tv.tv_nsec);
-            rand_initialized = true;
-        }
-        while (ns.size())
-        {
-            int i = lrand48() % ns.size();
-            addresses_to_try.push_back(etcd_addresses[ns[i]]);
-            ns.erase(ns.begin()+i, ns.begin()+i+1);
-        }
-    }
-    selected_etcd_address = addresses_to_try[0];
-    addresses_to_try.erase(addresses_to_try.begin(), addresses_to_try.begin()+1);
-}
-
-void etcd_state_client_t::start_etcd_watcher()
-{
-    if (!etcd_addresses.size() && !etcd_local.size())
-    {
-        fprintf(stderr, "etcd_address is missing in Vitastor configuration\n");
-        exit(1);
-    }
-    pick_next_etcd();
-    std::string etcd_address = selected_etcd_address;
-    std::string etcd_api_path;
-    int pos = etcd_address.find('/');
-    if (pos >= 0)
-    {
-        etcd_api_path = etcd_address.substr(pos);
-        etcd_address = etcd_address.substr(0, pos);
-    }
-    etcd_watches_initialised = 0;
-    ws_alive = 1;
-    if (etcd_watch_ws)
-    {
-        http_close(etcd_watch_ws);
-        etcd_watch_ws = NULL;
-    }
-    if (this->log_level > 1)
-    {
-        fprintf(stderr, "Trying to connect to etcd websocket at %s, watch from revision %ju/%ju/%ju\n", etcd_address.c_str(),
-            etcd_watch_revision_config, etcd_watch_revision_osd, etcd_watch_revision_pg);
-    }
-    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)
-    {
-        if (msg->body.length())
-        {
-            ws_alive = 1;
-            std::string json_err;
-            json11::Json data = json11::Json::parse(msg->body, json_err);
-            if (json_err != "")
-            {
-                fprintf(stderr, "Bad JSON in etcd event: %s, ignoring event\n", json_err.c_str());
-            }
-            else
-            {
-                uint64_t watch_id = data["result"]["watch_id"].uint64_value();
-                if (data["result"]["created"].bool_value())
-                {
-                    if (watch_id == ETCD_CONFIG_WATCH_ID ||
-                        watch_id == ETCD_PG_STATE_WATCH_ID ||
-                        watch_id == ETCD_OSD_STATE_WATCH_ID)
-                    {
-                        etcd_watches_initialised++;
-                    }
-                    if (etcd_watches_initialised == ETCD_TOTAL_WATCHES && this->log_level > 0)
-                    {
-                        fprintf(stderr, "Successfully subscribed to etcd at %s, revision %ju/%ju/%ju\n", cur_addr.c_str(),
-                            etcd_watch_revision_config, etcd_watch_revision_osd, etcd_watch_revision_pg);
-                    }
-                }
-                if (data["result"]["canceled"].bool_value())
-                {
-                    // etcd watch canceled, maybe because the revision was compacted
-                    if (data["result"]["compact_revision"].uint64_value())
-                    {
-                        // we may miss events if we proceed
-                        // so we should restart from the beginning if we can
-                        if (on_reload_hook != NULL)
-                        {
-                            // check to not trigger on_reload_hook multiple times
-                            if (etcd_watch_ws != NULL)
-                            {
-                                fprintf(stderr, "Revisions before %ju were compacted by etcd, reloading state\n",
-                                    data["result"]["compact_revision"].uint64_value());
-                                http_close(etcd_watch_ws);
-                                etcd_watch_ws = NULL;
-                                etcd_watch_revision_config = etcd_watch_revision_osd = etcd_watch_revision_pg = 0;
-                                on_reload_hook();
-                            }
-                            return;
-                        }
-                        else
-                        {
-                            fprintf(stderr, "Revisions before %ju were compacted by etcd, exiting\n",
-                                data["result"]["compact_revision"].uint64_value());
-                            exit(1);
-                        }
-                    }
-                    else
-                    {
-                        fprintf(stderr, "Watch canceled by etcd, reason: %s, exiting\n", data["result"]["cancel_reason"].string_value().c_str());
-                        exit(1);
-                    }
-                }
-                // Save revision only if it's present in the message - because 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"}}
-                // Also don't save revision from the initial created: true messages because they always contain the latest revision
-                if (etcd_watches_initialised == ETCD_TOTAL_WATCHES &&
-                    !data["result"]["header"]["revision"].is_null() &&
-                    !data["result"]["created"].bool_value())
-                {
-                    // Restart watchers from the same revision number as in the last received message,
-                    // not from the next one to protect against revision being split into multiple messages,
-                    // even though etcd guarantees not to do that **within a single watcher** without fragment=true:
-                    // https://etcd.io/docs/v3.5/learning/api_guarantees/#watch-apis
-                    // Revision contents are ALWAYS split into separate messages for different watchers though!
-                    // So generally we have to resume each watcher from its own revision...
-                    // Progress messages may have watch_id=-1 if sent on behalf of multiple watchers though.
-                    // And antietcd has an advanced semantic which merges the same revision for all watchers
-                    // into one message and just omits watch_id.
-                    // So we also have to handle the case where watch_id is -1 or not present (0).
-                    auto watch_rev = data["result"]["header"]["revision"].uint64_value();
-                    if (!watch_id || watch_id == UINT64_MAX)
-                        etcd_watch_revision_config = etcd_watch_revision_osd = etcd_watch_revision_pg = watch_rev;
-                    else if (watch_id == ETCD_CONFIG_WATCH_ID)
-                        etcd_watch_revision_config = watch_rev;
-                    else if (watch_id == ETCD_PG_STATE_WATCH_ID)
-                        etcd_watch_revision_pg = watch_rev;
-                    else if (watch_id == ETCD_OSD_STATE_WATCH_ID)
-                        etcd_watch_revision_osd = watch_rev;
-                    addresses_to_try.clear();
-                }
-                // First gather all changes into a hash to remove multiple overwrites
-                std::map<std::string, etcd_kv_t> changes;
-                for (auto & ev: data["result"]["events"].array_items())
-                {
-                    auto kv = parse_etcd_kv(ev["kv"]);
-                    if (kv.key != "")
-                    {
-                        changes[kv.key] = kv;
-                    }
-                }
-                for (auto & kv: changes)
-                {
-                    if (this->log_level > 3)
-                    {
-                        fprintf(stderr, "Incoming event: %s -> %s\n", kv.first.c_str(), kv.second.value.dump().c_str());
-                    }
-                    parse_state(kv.second);
-                }
-                // React to changes
-                if (on_change_hook != NULL)
-                {
-                    on_change_hook(changes);
-                }
-            }
-        }
-        if (msg->eof)
-        {
-            fprintf(stderr, "Disconnected from etcd %s\n", cur_addr.c_str());
-            if (cur_addr == selected_etcd_address)
-                selected_etcd_address = "";
-            if (etcd_watch_ws)
-            {
-                http_close(etcd_watch_ws);
-                etcd_watch_ws = NULL;
-            }
-            if (etcd_watches_initialised == 0)
-            {
-                // Connection not established, retry in <etcd_quick_timeout>
-                tfd->set_timer(etcd_quick_timeout, false, [this](int)
-                {
-                    start_etcd_watcher();
-                });
-            }
-            else if (etcd_watches_initialised > 0)
-            {
-                // Connection was live, retry immediately
-                etcd_watches_initialised = 0;
-                start_etcd_watcher();
-            }
-        }
-    });
-    http_post_message(etcd_watch_ws, WS_TEXT, json11::Json(json11::Json::object {
-        { "create_request", json11::Json::object {
-            { "key", base64_encode(etcd_prefix+"/config/") },
-            { "range_end", base64_encode(etcd_prefix+"/config0") },
-            { "start_revision", etcd_watch_revision_config },
-            { "watch_id", ETCD_CONFIG_WATCH_ID },
-            { "progress_notify", true },
-        } }
-    }).dump());
-    http_post_message(etcd_watch_ws, WS_TEXT, json11::Json(json11::Json::object {
-        { "create_request", json11::Json::object {
-            { "key", base64_encode(etcd_prefix+"/osd/state/") },
-            { "range_end", base64_encode(etcd_prefix+"/osd/state0") },
-            { "start_revision", etcd_watch_revision_osd },
-            { "watch_id", ETCD_OSD_STATE_WATCH_ID },
-            { "progress_notify", true },
-        } }
-    }).dump());
-    http_post_message(etcd_watch_ws, WS_TEXT, json11::Json(json11::Json::object {
-        { "create_request", json11::Json::object {
-            { "key", base64_encode(etcd_prefix+"/pg/") },
-            { "range_end", base64_encode(etcd_prefix+"/pg0") },
-            { "start_revision", etcd_watch_revision_pg },
-            { "watch_id", ETCD_PG_STATE_WATCH_ID },
-            { "progress_notify", true },
-        } }
-    }).dump());
-    // FIXME: Do not watch /pg/history/ at all in client code (not in OSD)
-    if (on_start_watcher_hook)
-    {
-        on_start_watcher_hook(etcd_watch_ws);
-    }
-    start_ws_keepalive();
-}
-
-void etcd_state_client_t::stop_ws_keepalive()
-{
-    if (ws_keepalive_timer >= 0)
-    {
-        tfd->clear_timer(ws_keepalive_timer);
-        ws_keepalive_timer = -1;
-    }
-}
-
-void etcd_state_client_t::start_ws_keepalive()
-{
-    if (ws_keepalive_timer < 0)
-    {
-        ws_keepalive_timer = tfd->set_timer(etcd_ws_keepalive_interval*1000, true, [this](int)
-        {
-            if (!etcd_watch_ws || etcd_watches_initialised < ETCD_TOTAL_WATCHES)
-            {
-                // Do nothing
-            }
-            else if (!ws_alive)
-            {
-                if (this->log_level > 0)
-                {
-                    fprintf(stderr, "Websocket ping failed, disconnecting from etcd %s\n", selected_etcd_address.c_str());
-                }
-                if (etcd_watch_ws)
-                {
-                    http_close(etcd_watch_ws);
-                    etcd_watch_ws = NULL;
-                }
-                start_etcd_watcher();
-            }
-            else
-            {
-                ws_alive = 0;
-                http_post_message(etcd_watch_ws, WS_TEXT, json11::Json(json11::Json::object {
-                    { "progress_request", json11::Json::object { } }
-                }).dump());
-            }
-        });
-    }
-}
-
-void etcd_state_client_t::load_global_config()
+void etcd_state_client_t::load_global_config(std::function<void(const std::string & error)> cb)
 {
    json11::Json::object req = { { "success", json11::Json::array {
        json11::Json::object {
@@ -583,22 +178,12 @@ void etcd_state_client_t::load_global_config()
            } }
        },
    } } };
-    etcd_txn(req, etcd_quick_timeout, max_etcd_attempts, 0, [this](std::string err, json11::Json data)
+    etcd_txn(req, etcd_quick_timeout, max_etcd_attempts, 0, [this, cb](std::string err, json11::Json data)
    {
        if (err != "")
        {
            fprintf(stderr, "Error reading configuration from etcd: %s\n", err.c_str());
-            if (infinite_start)
-            {
-                tfd->set_timer(etcd_slow_timeout, false, [this](int timer_id)
-                {
-                    load_global_config();
-                });
-            }
-            else
-            {
-                exit(1);
-            }
+            cb(err);
            return;
        }
        json11::Json config_kv = data["responses"][0]["response_range"]["kvs"][0];
@@ -629,28 +214,12 @@ void etcd_state_client_t::load_global_config()
            parse_state(kv);
        }
        on_load_config_hook(global_config);
+        cb("");
    });
 }

-void etcd_state_client_t::load_pgs()
+void etcd_state_client_t::load_pgs(std::function<void(const std::string &)> cb)
 {
-    timespec tv;
-    clock_gettime(CLOCK_REALTIME, &tv);
-    uint64_t ms_passed = (tv.tv_sec-etcd_last_reload.tv_sec)*1000 + (tv.tv_nsec-etcd_last_reload.tv_nsec)/1000000;
-    if (ms_passed < etcd_min_reload_interval)
-    {
-        if (load_pgs_timer_id < 0)
-        {
-            load_pgs_timer_id = tfd->set_timer(etcd_min_reload_interval+50-ms_passed, false, [this](int) { load_pgs(); });
-        }
-        return;
-    }
-    etcd_last_reload = tv;
-    if (load_pgs_timer_id >= 0)
-    {
-        tfd->clear_timer(load_pgs_timer_id);
-        load_pgs_timer_id = -1;
-    }
    json11::Json::array txn = {
        json11::Json::object {
            { "request_range", json11::Json::object {
@@ -698,16 +267,13 @@ void etcd_state_client_t::load_pgs()
    {
        req["compare"] = checks;
    }
-    etcd_txn_slow(req, [this](std::string err, json11::Json data)
+    etcd_txn_slow(req, [this, cb](std::string err, json11::Json data)
    {
        if (err != "")
        {
            // Retry indefinitely
            fprintf(stderr, "Error loading PGs from etcd: %s\n", err.c_str());
-            tfd->set_timer(etcd_slow_timeout, false, [this](int timer_id)
-            {
-                load_pgs();
-            });
+            cb(err);
            return;
        }
        if (!data["succeeded"].bool_value())
@@ -735,24 +301,9 @@ void etcd_state_client_t::load_pgs()
        }
        clean_nonexistent_pgs();
        on_load_pgs_hook(true);
-        start_etcd_watcher();
+        cb("");
    });
 }
-#else
-void etcd_state_client_t::parse_config(const json11::Json & config)
-{
-}
-
-void etcd_state_client_t::load_global_config()
-{
-    json11::Json::object global_config;
-    on_load_config_hook(global_config);
-}
-
-void etcd_state_client_t::load_pgs()
-{
-}
-#endif

 void etcd_state_client_t::reset_pg_exists()
 {
@@ -865,7 +416,8 @@ void etcd_state_client_t::parse_state(const etcd_kv_t & kv)
            if (pc.pg_size < 1 ||
                pool_item.second["pg_size"].uint64_value() < 3 &&
                (pc.scheme == POOL_SCHEME_XOR || pc.scheme == POOL_SCHEME_EC) ||
-                pool_item.second["pg_size"].uint64_value() > 256)
+                // limit is 64 because osd_peering_pg.cpp uses a 64-bit mask for has_roles
+                pool_item.second["pg_size"].uint64_value() > 64)
            {
                fprintf(stderr, "Pool %u has invalid pg_size, skipping pool\n", pool_id);
                continue;
@@ -1205,8 +757,14 @@ void etcd_state_client_t::parse_state(const etcd_kv_t & kv)
    else if (key.substr(0, etcd_prefix.length()+11) == etcd_prefix+"/osd/state/")
    {
        // <etcd_prefix>/osd/state/%d
-        osd_num_t peer_osd = std::stoull(key.substr(etcd_prefix.length()+11));
-        if (peer_osd > 0)
+        osd_num_t peer_osd = 0;
+        char null_byte = 0;
+        int scanned = sscanf(key.c_str() + etcd_prefix.length()+11, "%ju%c", &peer_osd, &null_byte);
+        if (scanned != 1 || !peer_osd)
+        {
+            fprintf(stderr, "Bad etcd key %s, ignoring\n", key.c_str());
+        }
+        else
        {
            if (value.is_object() && value["state"] == "up")
            {
@@ -103,15 +103,13 @@ protected:
    std::vector<std::string> local_ips;
    std::vector<std::string> etcd_addresses;
    std::vector<std::string> etcd_local;
-    std::string selected_etcd_address;
-    std::vector<std::string> addresses_to_try;
    std::vector<inode_watch_t*> watches;
+    std::set<osd_num_t> seen_peers;
    bool new_pg_config = false;
-    int ws_keepalive_timer = -1;
-    int ws_alive = 0;
-    bool rand_initialized = false;
+
    void add_etcd_url(std::string);
-    void pick_next_etcd();
+    void reset_pg_exists();
+    void clean_nonexistent_pgs();
 public:
    int etcd_keepalive_timeout = 30;
    int etcd_ws_keepalive_interval = 5;
@@ -123,21 +121,15 @@ public:
    uint64_t global_block_size = DEFAULT_BLOCK_SIZE;
    uint32_t global_bitmap_granularity = DEFAULT_BITMAP_GRANULARITY;
    uint32_t global_immediate_commit = IMMEDIATE_NONE;
-
    std::string etcd_prefix;
    int log_level = 0;
-    timerfd_manager_t *tfd = NULL;

-    http_co_t *etcd_watch_ws = NULL, *keepalive_client = NULL;
-    int etcd_watches_initialised = 0;
    uint64_t etcd_watch_revision_config = 0;
    uint64_t etcd_watch_revision_osd = 0;
    uint64_t etcd_watch_revision_pg = 0;
-    timespec etcd_last_reload = {};
-    int load_pgs_timer_id = -1;
+
    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;
    json11::Json node_placement;
@@ -160,24 +152,22 @@ public:
    json11::Json::object serialize_inode_cfg(inode_config_t *cfg);
    etcd_kv_t parse_etcd_kv(const json11::Json & kv_json);
    std::vector<std::string> get_addresses();
-    void etcd_call_oneshot(std::string etcd_address, std::string api, json11::Json payload, int timeout, std::function<void(std::string, json11::Json)> callback);
-    void etcd_call(std::string api, json11::Json payload, int timeout, int retries, int interval, std::function<void(std::string, json11::Json)> callback);
+    virtual void etcd_call_oneshot(std::string etcd_address, std::string api, json11::Json payload, int timeout, std::function<void(std::string, json11::Json)> callback) = 0;
+    virtual void etcd_call(std::string api, json11::Json payload, int timeout, int retries, int interval, std::function<void(std::string, json11::Json)> callback) = 0;
    void etcd_txn(json11::Json txn, int timeout, int retries, int interval, std::function<void(std::string, json11::Json)> callback);
    void etcd_txn_slow(json11::Json txn, std::function<void(std::string, json11::Json)> callback);
-    void start_etcd_watcher();
-    void stop_ws_keepalive();
-    void start_ws_keepalive();
-    void load_global_config();
-    void load_pgs();
-    void reset_pg_exists();
-    void clean_nonexistent_pgs();
+    virtual void etcd_add_watch(json11::Json watch) = 0;
+    void load_global_config(std::function<void(const std::string &)> cb);
+    virtual void load_global_config() = 0;
+    void load_pgs(std::function<void(const std::string &)> cb);
+    virtual void load_pgs() = 0;
    void parse_state(const etcd_kv_t & kv);
-    void parse_config(const json11::Json & config);
+    virtual void parse_config(const json11::Json & config);
    void insert_inode_config(const inode_config_t & cfg);
    inode_watch_t* watch_inode(std::string name);
    void close_watch(inode_watch_t* watch);
    int address_count();
-    ~etcd_state_client_t();
+    virtual ~etcd_state_client_t();

    static uint32_t parse_immediate_commit(const std::string & immediate_commit_str, uint32_t default_value);
    static uint32_t parse_scheme(const std::string & scheme_str);
@@ -0,0 +1,487 @@
+// Copyright (c) Vitaliy Filippov, 2019+
+// License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
+
+#include "etcd_state_client_http.h"
+#include "addr_util.h"
+#include "http_client.h"
+#include "str_util.h"
+
+etcd_state_client_http_t::etcd_state_client_http_t(timerfd_manager_t *tfd)
+{
+    this->tfd = tfd;
+}
+
+etcd_state_client_http_t::~etcd_state_client_http_t()
+{
+    stop_ws_keepalive();
+    if (etcd_watch_ws)
+    {
+        http_close(etcd_watch_ws);
+        etcd_watch_ws = NULL;
+    }
+    if (keepalive_client)
+    {
+        http_close(keepalive_client);
+        keepalive_client = NULL;
+    }
+    if (load_pgs_timer_id >= 0)
+    {
+        tfd->clear_timer(load_pgs_timer_id);
+        load_pgs_timer_id = -1;
+    }
+    etcd_watches_initialised = -1;
+}
+
+void etcd_state_client_http_t::etcd_add_watch(json11::Json watch)
+{
+    if (etcd_watch_ws)
+    {
+        http_post_message(etcd_watch_ws, WS_TEXT, watch.dump());
+    }
+}
+
+void etcd_state_client_http_t::etcd_call_oneshot(std::string etcd_address, std::string api, json11::Json payload,
+    int timeout, std::function<void(std::string, json11::Json)> callback)
+{
+    std::string etcd_api_path;
+    int pos = etcd_address.find('/');
+    if (pos >= 0)
+    {
+        etcd_api_path = etcd_address.substr(pos);
+        etcd_address = etcd_address.substr(0, pos);
+    }
+    std::string req = payload.dump();
+    req = "POST "+etcd_api_path+api+" HTTP/1.1\r\n"
+        "Host: "+etcd_address+"\r\n"
+        "Content-Type: application/json\r\n"
+        "Content-Length: "+std::to_string(req.size())+"\r\n"
+        "Connection: close\r\n"
+        "\r\n"+req;
+    auto http_cli = http_init(tfd);
+    auto cb = [http_cli, callback](const http_response_t *response)
+    {
+        std::string err;
+        json11::Json data;
+        response->parse_json_response(err, data);
+        callback(err, data);
+        http_close(http_cli);
+    };
+    http_request(http_cli, etcd_address, req, { .timeout = timeout }, cb);
+}
+
+void etcd_state_client_http_t::etcd_call(std::string api, json11::Json payload, int timeout,
+    int retries, int interval, std::function<void(std::string, json11::Json)> callback)
+{
+    if (!etcd_addresses.size() && !etcd_local.size())
+    {
+        fprintf(stderr, "etcd_address is missing in Vitastor configuration\n");
+        exit(1);
+    }
+    pick_next_etcd();
+    std::string etcd_address = selected_etcd_address;
+    std::string etcd_api_path;
+    int pos = etcd_address.find('/');
+    if (pos >= 0)
+    {
+        etcd_api_path = etcd_address.substr(pos);
+        etcd_address = etcd_address.substr(0, pos);
+    }
+    std::string req = payload.dump();
+    req = "POST "+etcd_api_path+api+" HTTP/1.1\r\n"
+        "Host: "+etcd_address+"\r\n"
+        "Content-Type: application/json\r\n"
+        "Content-Length: "+std::to_string(req.size())+"\r\n"
+        "Connection: keep-alive\r\n"
+        "Keep-Alive: timeout="+std::to_string(etcd_keepalive_timeout)+"\r\n"
+        "\r\n"+req;
+    retries--;
+    auto cb = [this, api, payload, timeout, retries, interval, callback,
+        cur_addr = selected_etcd_address](const http_response_t *response)
+    {
+        std::string err;
+        json11::Json data;
+        response->parse_json_response(err, data);
+        if (err != "")
+        {
+            if (cur_addr == selected_etcd_address)
+                selected_etcd_address = "";
+            if (retries > 0)
+            {
+                if (this->log_level > 0)
+                {
+                    fprintf(
+                        stderr, "Warning: etcd request failed: %s, retrying %d more times\n",
+                        err.c_str(), retries
+                    );
+                }
+                if (interval > 0)
+                {
+                    // FIXME: Prevent destruction of etcd_state_client if timers or requests are active
+                    tfd->set_timer(interval, false, [this, api, payload, timeout, retries, interval, callback](int)
+                    {
+                        etcd_call(api, payload, timeout, retries, interval, callback);
+                    });
+                }
+                else
+                    etcd_call(api, payload, timeout, retries, interval, callback);
+            }
+            else
+                callback(err, data);
+        }
+        else
+            callback(err, data);
+    };
+    if (!keepalive_client)
+    {
+        keepalive_client = http_init(tfd);
+    }
+    http_request(keepalive_client, etcd_address, req, { .timeout = timeout, .keepalive = true }, cb);
+}
+
+void etcd_state_client_http_t::parse_config(const json11::Json & config)
+{
+    auto old_etcd_ws_keepalive_interval = this->etcd_ws_keepalive_interval;
+    etcd_state_client_t::parse_config(config);
+    if (this->etcd_ws_keepalive_interval != old_etcd_ws_keepalive_interval && ws_keepalive_timer >= 0)
+    {
+        stop_ws_keepalive();
+        start_ws_keepalive();
+    }
+}
+
+void etcd_state_client_http_t::pick_next_etcd()
+{
+    if (selected_etcd_address != "")
+        return;
+    if (addresses_to_try.size() == 0)
+    {
+        // Prefer local etcd, if any
+        for (int i = 0; i < etcd_local.size(); i++)
+            addresses_to_try.push_back(etcd_local[i]);
+        std::vector<int> ns;
+        for (int i = 0; i < etcd_addresses.size(); i++)
+            ns.push_back(i);
+        if (!rand_initialized)
+        {
+            timespec tv;
+            clock_gettime(CLOCK_REALTIME, &tv);
+            srand48(tv.tv_sec*1000000000 + tv.tv_nsec);
+            rand_initialized = true;
+        }
+        while (ns.size())
+        {
+            int i = lrand48() % ns.size();
+            addresses_to_try.push_back(etcd_addresses[ns[i]]);
+            ns.erase(ns.begin()+i, ns.begin()+i+1);
+        }
+    }
+    selected_etcd_address = addresses_to_try[0];
+    addresses_to_try.erase(addresses_to_try.begin(), addresses_to_try.begin()+1);
+}
+
+void etcd_state_client_http_t::start_etcd_watcher()
+{
+    if (!etcd_addresses.size() && !etcd_local.size())
+    {
+        fprintf(stderr, "etcd_address is missing in Vitastor configuration\n");
+        exit(1);
+    }
+    pick_next_etcd();
+    std::string etcd_address = selected_etcd_address;
+    std::string etcd_api_path;
+    int pos = etcd_address.find('/');
+    if (pos >= 0)
+    {
+        etcd_api_path = etcd_address.substr(pos);
+        etcd_address = etcd_address.substr(0, pos);
+    }
+    etcd_watches_initialised = 0;
+    ws_alive = 1;
+    if (etcd_watch_ws)
+    {
+        http_close(etcd_watch_ws);
+        etcd_watch_ws = NULL;
+    }
+    if (this->log_level > 1)
+    {
+        fprintf(stderr, "Trying to connect to etcd websocket at %s, watch from revision %ju/%ju/%ju\n", etcd_address.c_str(),
+            etcd_watch_revision_config, etcd_watch_revision_osd, etcd_watch_revision_pg);
+    }
+    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)
+    {
+        if (msg->body.length())
+        {
+            ws_alive = 1;
+            std::string json_err;
+            json11::Json data = json11::Json::parse(msg->body, json_err);
+            if (json_err != "")
+            {
+                fprintf(stderr, "Bad JSON in etcd event: %s, ignoring event\n", json_err.c_str());
+            }
+            else
+            {
+                uint64_t watch_id = data["result"]["watch_id"].uint64_value();
+                if (data["result"]["created"].bool_value())
+                {
+                    if (watch_id == ETCD_CONFIG_WATCH_ID ||
+                        watch_id == ETCD_PG_STATE_WATCH_ID ||
+                        watch_id == ETCD_OSD_STATE_WATCH_ID)
+                    {
+                        etcd_watches_initialised++;
+                    }
+                    if (etcd_watches_initialised == ETCD_TOTAL_WATCHES && this->log_level > 0)
+                    {
+                        fprintf(stderr, "Successfully subscribed to etcd at %s, revision %ju/%ju/%ju\n", cur_addr.c_str(),
+                            etcd_watch_revision_config, etcd_watch_revision_osd, etcd_watch_revision_pg);
+                    }
+                }
+                if (data["result"]["canceled"].bool_value())
+                {
+                    // etcd watch canceled, maybe because the revision was compacted
+                    if (data["result"]["compact_revision"].uint64_value())
+                    {
+                        // we may miss events if we proceed
+                        // so we should restart from the beginning if we can
+                        if (on_reload_hook != NULL)
+                        {
+                            // check to not trigger on_reload_hook multiple times
+                            if (etcd_watch_ws != NULL)
+                            {
+                                fprintf(stderr, "Revisions before %ju were compacted by etcd, reloading state\n",
+                                    data["result"]["compact_revision"].uint64_value());
+                                http_close(etcd_watch_ws);
+                                etcd_watch_ws = NULL;
+                                etcd_watch_revision_config = etcd_watch_revision_osd = etcd_watch_revision_pg = 0;
+                                on_reload_hook();
+                            }
+                            return;
+                        }
+                        else
+                        {
+                            fprintf(stderr, "Revisions before %ju were compacted by etcd, exiting\n",
+                                data["result"]["compact_revision"].uint64_value());
+                            exit(1);
+                        }
+                    }
+                    else
+                    {
+                        fprintf(stderr, "Watch canceled by etcd, reason: %s, exiting\n", data["result"]["cancel_reason"].string_value().c_str());
+                        exit(1);
+                    }
+                }
+                // Save revision only if it's present in the message - because 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"}}
+                // Also don't save revision from the initial created: true messages because they always contain the latest revision
+                if (etcd_watches_initialised == ETCD_TOTAL_WATCHES &&
+                    !data["result"]["header"]["revision"].is_null() &&
+                    !data["result"]["created"].bool_value())
+                {
+                    // Restart watchers from the same revision number as in the last received message,
+                    // not from the next one to protect against revision being split into multiple messages,
+                    // even though etcd guarantees not to do that **within a single watcher** without fragment=true:
+                    // https://etcd.io/docs/v3.5/learning/api_guarantees/#watch-apis
+                    // Revision contents are ALWAYS split into separate messages for different watchers though!
+                    // So generally we have to resume each watcher from its own revision...
+                    // Progress messages may have watch_id=-1 if sent on behalf of multiple watchers though.
+                    // And antietcd has an advanced semantic which merges the same revision for all watchers
+                    // into one message and just omits watch_id.
+                    // So we also have to handle the case where watch_id is -1 or not present (0).
+                    auto watch_rev = data["result"]["header"]["revision"].uint64_value();
+                    if (!watch_id || watch_id == UINT64_MAX)
+                        etcd_watch_revision_config = etcd_watch_revision_osd = etcd_watch_revision_pg = watch_rev;
+                    else if (watch_id == ETCD_CONFIG_WATCH_ID)
+                        etcd_watch_revision_config = watch_rev;
+                    else if (watch_id == ETCD_PG_STATE_WATCH_ID)
+                        etcd_watch_revision_pg = watch_rev;
+                    else if (watch_id == ETCD_OSD_STATE_WATCH_ID)
+                        etcd_watch_revision_osd = watch_rev;
+                    addresses_to_try.clear();
+                }
+                // First gather all changes into a hash to remove multiple overwrites
+                std::map<std::string, etcd_kv_t> changes;
+                for (auto & ev: data["result"]["events"].array_items())
+                {
+                    auto kv = parse_etcd_kv(ev["kv"]);
+                    if (kv.key != "")
+                    {
+                        changes[kv.key] = kv;
+                    }
+                }
+                for (auto & kv: changes)
+                {
+                    if (this->log_level > 3)
+                    {
+                        fprintf(stderr, "Incoming event: %s -> %s\n", kv.first.c_str(), kv.second.value.dump().c_str());
+                    }
+                    parse_state(kv.second);
+                }
+                // React to changes
+                if (on_change_hook != NULL)
+                {
+                    on_change_hook(changes);
+                }
+            }
+        }
+        if (msg->eof)
+        {
+            fprintf(stderr, "Disconnected from etcd %s\n", cur_addr.c_str());
+            if (cur_addr == selected_etcd_address)
+                selected_etcd_address = "";
+            if (etcd_watch_ws)
+            {
+                http_close(etcd_watch_ws);
+                etcd_watch_ws = NULL;
+            }
+            if (etcd_watches_initialised == 0)
+            {
+                // Connection not established, retry in <etcd_quick_timeout>
+                tfd->set_timer(etcd_quick_timeout, false, [this](int)
+                {
+                    start_etcd_watcher();
+                });
+            }
+            else if (etcd_watches_initialised > 0)
+            {
+                // Connection was live, retry immediately
+                etcd_watches_initialised = 0;
+                start_etcd_watcher();
+            }
+        }
+    });
+    http_post_message(etcd_watch_ws, WS_TEXT, json11::Json(json11::Json::object {
+        { "create_request", json11::Json::object {
+            { "key", base64_encode(etcd_prefix+"/config/") },
+            { "range_end", base64_encode(etcd_prefix+"/config0") },
+            { "start_revision", etcd_watch_revision_config },
+            { "watch_id", ETCD_CONFIG_WATCH_ID },
+            { "progress_notify", true },
+        } }
+    }).dump());
+    http_post_message(etcd_watch_ws, WS_TEXT, json11::Json(json11::Json::object {
+        { "create_request", json11::Json::object {
+            { "key", base64_encode(etcd_prefix+"/osd/state/") },
+            { "range_end", base64_encode(etcd_prefix+"/osd/state0") },
+            { "start_revision", etcd_watch_revision_osd },
+            { "watch_id", ETCD_OSD_STATE_WATCH_ID },
+            { "progress_notify", true },
+        } }
+    }).dump());
+    http_post_message(etcd_watch_ws, WS_TEXT, json11::Json(json11::Json::object {
+        { "create_request", json11::Json::object {
+            { "key", base64_encode(etcd_prefix+"/pg/") },
+            { "range_end", base64_encode(etcd_prefix+"/pg0") },
+            { "start_revision", etcd_watch_revision_pg },
+            { "watch_id", ETCD_PG_STATE_WATCH_ID },
+            { "progress_notify", true },
+        } }
+    }).dump());
+    // FIXME: Do not watch /pg/history/ at all in client code (not in OSD)
+    if (on_start_watcher_hook)
+    {
+        on_start_watcher_hook(etcd_watch_ws);
+    }
+    start_ws_keepalive();
+}
+
+void etcd_state_client_http_t::stop_ws_keepalive()
+{
+    if (ws_keepalive_timer >= 0)
+    {
+        tfd->clear_timer(ws_keepalive_timer);
+        ws_keepalive_timer = -1;
+    }
+}
+
+void etcd_state_client_http_t::start_ws_keepalive()
+{
+    if (ws_keepalive_timer < 0)
+    {
+        ws_keepalive_timer = tfd->set_timer(etcd_ws_keepalive_interval*1000, true, [this](int)
+        {
+            if (!etcd_watch_ws || etcd_watches_initialised < ETCD_TOTAL_WATCHES)
+            {
+                // Do nothing
+            }
+            else if (!ws_alive)
+            {
+                if (this->log_level > 0)
+                {
+                    fprintf(stderr, "Websocket ping failed, disconnecting from etcd %s\n", selected_etcd_address.c_str());
+                }
+                if (etcd_watch_ws)
+                {
+                    http_close(etcd_watch_ws);
+                    etcd_watch_ws = NULL;
+                }
+                start_etcd_watcher();
+            }
+            else
+            {
+                ws_alive = 0;
+                http_post_message(etcd_watch_ws, WS_TEXT, json11::Json(json11::Json::object {
+                    { "progress_request", json11::Json::object { } }
+                }).dump());
+            }
+        });
+    }
+}
+
+void etcd_state_client_http_t::load_global_config()
+{
+    etcd_state_client_t::load_global_config([this](const std::string & err)
+    {
+        if (err != "")
+        {
+            fprintf(stderr, "Error reading configuration from etcd: %s\n", err.c_str());
+            if (infinite_start)
+            {
+                tfd->set_timer(etcd_slow_timeout, false, [this](int timer_id)
+                {
+                    load_global_config();
+                });
+            }
+            else
+            {
+                exit(1);
+            }
+        }
+    });
+}
+
+void etcd_state_client_http_t::load_pgs()
+{
+    timespec tv;
+    clock_gettime(CLOCK_REALTIME, &tv);
+    uint64_t ms_passed = (tv.tv_sec-etcd_last_reload.tv_sec)*1000 + (tv.tv_nsec-etcd_last_reload.tv_nsec)/1000000;
+    if (ms_passed < etcd_min_reload_interval)
+    {
+        if (load_pgs_timer_id < 0)
+        {
+            load_pgs_timer_id = tfd->set_timer(etcd_min_reload_interval+50-ms_passed, false, [this](int) { load_pgs(); });
+        }
+        return;
+    }
+    etcd_last_reload = tv;
+    if (load_pgs_timer_id >= 0)
+    {
+        tfd->clear_timer(load_pgs_timer_id);
+        load_pgs_timer_id = -1;
+    }
+    etcd_state_client_t::load_pgs([this](const std::string & err)
+    {
+        if (err != "")
+        {
+            // Retry indefinitely
+            fprintf(stderr, "Error loading PGs from etcd: %s\n", err.c_str());
+            tfd->set_timer(etcd_slow_timeout, false, [this](int timer_id)
+            {
+                load_pgs();
+            });
+        }
+        else
+        {
+            start_etcd_watcher();
+        }
+    });
+}
@@ -0,0 +1,36 @@
+// Copyright (c) Vitaliy Filippov, 2019+
+// License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
+
+#pragma once
+
+#include "etcd_state_client.h"
+
+struct __attribute__((visibility("default"))) etcd_state_client_http_t: public etcd_state_client_t
+{
+protected:
+    timerfd_manager_t *tfd = NULL;
+    std::string selected_etcd_address;
+    std::vector<std::string> addresses_to_try;
+    int ws_keepalive_timer = -1;
+    int ws_alive = 0;
+    bool rand_initialized = false;
+    int etcd_watches_initialised = 0;
+    timespec etcd_last_reload = {};
+    int load_pgs_timer_id = -1;
+    http_co_t *keepalive_client = NULL;
+
+    void pick_next_etcd();
+    void start_etcd_watcher();
+    void stop_ws_keepalive();
+    void start_ws_keepalive();
+public:
+    http_co_t *etcd_watch_ws = NULL;
+    etcd_state_client_http_t(timerfd_manager_t *tfd);
+    void etcd_call_oneshot(std::string etcd_address, std::string api, json11::Json payload, int timeout, std::function<void(std::string, json11::Json)> callback) override;
+    void etcd_call(std::string api, json11::Json payload, int timeout, int retries, int interval, std::function<void(std::string, json11::Json)> callback) override;
+    void etcd_add_watch(json11::Json watch) override;
+    void load_global_config() override;
+    void load_pgs() override;
+    void parse_config(const json11::Json & config) override;
+    ~etcd_state_client_http_t();
+};
@@ -0,0 +1,205 @@
+// Copyright (c) Vitaliy Filippov, 2019+
+// License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
+
+#include <assert.h>
+#include "etcd_state_client_mock.h"
+#include "str_util.h"
+
+etcd_state_client_mock_t::etcd_state_client_mock_t()
+{
+    timespec tv;
+    clock_gettime(CLOCK_REALTIME, &tv);
+    srand48(tv.tv_sec*1000000000 + tv.tv_nsec);
+}
+
+void etcd_state_client_mock_t::etcd_add_watch(json11::Json watch)
+{
+}
+
+void etcd_state_client_mock_t::etcd_call_oneshot(std::string etcd_address, std::string api, json11::Json payload,
+    int timeout, std::function<void(std::string, json11::Json)> callback)
+{
+}
+
+void etcd_state_client_mock_t::pause()
+{
+    paused = true;
+}
+
+void etcd_state_client_mock_t::resume()
+{
+    paused = false;
+    auto queue = std::move(this->queue);
+    for (auto& req: queue)
+    {
+        etcd_call(req.api, req.payload, req.timeout, req.retries, req.interval, req.callback);
+    }
+}
+
+void etcd_state_client_mock_t::set(const std::string& key, json11::Json data, uint64_t mod_revision, uint64_t lease_id)
+{
+    if (!mod_revision)
+        mod_revision = ++this->mod_revision;
+    this->data[key] = (etcd_mock_key_data_t){ .value = data.dump(), .mod_revision = mod_revision, .lease_id = lease_id };
+}
+
+void etcd_state_client_mock_t::etcd_call(std::string api, json11::Json payload, int timeout,
+    int retries, int interval, std::function<void(std::string, json11::Json)> callback)
+{
+    if (paused)
+    {
+        queue.push_back({ api, payload, timeout, retries, interval, callback });
+        return;
+    }
+    printf("+ etcd: %s\n", api.c_str());
+    if (api == "/kv/txn")
+    {
+        bool ok = true;
+        for (auto& check: payload["compare"].array_items())
+        {
+            auto key = base64_decode(check["key"].string_value());
+            etcd_mock_key_data_t *key_data = data.find(key) != data.end() ? &data.at(key) : NULL;
+            auto target = check["target"].string_value();
+            auto res = check["result"].string_value();
+            assert(res == "LESS" || res == "");
+            bool less = res == "LESS";
+            if (target == "MOD")
+            {
+                uint64_t rev = check["mod_revision"].uint64_value();
+                assert(!less || rev);
+                ok = ok && (less ? (!key_data || key_data->mod_revision < rev) : (key_data && key_data->mod_revision == rev));
+            }
+            else if (target == "CREATE")
+            {
+                uint64_t rev = check["create_revision"].uint64_value();
+                assert(rev == 0 && !less);
+                ok = ok && !key_data;
+            }
+            else if (target == "VERSION")
+            {
+                uint64_t rev = check["version"].uint64_value();
+                assert(rev == 0 && !less);
+                ok = ok && !key_data;
+            }
+            else if (target == "LEASE")
+            {
+                assert(!less);
+                uint64_t lease_id = check["lease"].uint64_value();
+                ok = ok && key_data && key_data->lease_id == lease_id;
+            }
+            else
+                assert(0);
+        }
+        std::map<std::string, etcd_kv_t> changes;
+        bool has_mod = false;
+        for (auto& op: payload[ok ? "success" : "failure"].array_items())
+        {
+            auto& obj = op.object_items();
+            has_mod = has_mod || obj.find("request_put") != obj.end() ||
+                obj.find("request_delete_range") != obj.end();
+        }
+        if (has_mod)
+        {
+            mod_revision++;
+        }
+        json11::Json::array responses;
+        for (auto& op_ptr: payload[ok ? "success" : "failure"].array_items())
+        {
+            auto& op = op_ptr.object_items();
+            if (op.find("request_range") != op.end())
+            {
+                json11::Json::array kvs;
+                auto req = op.at("request_range");
+                auto key = base64_decode(req["key"].string_value());
+                auto range_end = base64_decode(req["range_end"].string_value());
+                auto begin_it = range_end.empty() ? data.find(key) : data.lower_bound(key);
+                auto end_it = range_end.empty() ? (begin_it == data.end() ? begin_it : std::next(begin_it)) : data.lower_bound(range_end);
+                for (auto it = begin_it; it != end_it; it++)
+                {
+                    printf("\\- get: %s = %s, rev %ju\n", it->first.c_str(), it->second.value.c_str(), it->second.mod_revision);
+                    kvs.push_back(json11::Json::object {
+                        { "key", base64_encode(it->first) },
+                        { "value", base64_encode(it->second.value) },
+                        { "mod_revision", it->second.mod_revision },
+                    });
+                }
+                responses.push_back(json11::Json::object {
+                    { "response_range", json11::Json::object{ { "header", json11::Json::object{ { "revision", mod_revision } } }, { "kvs", kvs } } },
+                });
+            }
+            else if (op.find("request_put") != op.end())
+            {
+                auto req = op.at("request_put");
+                auto key = base64_decode(req["key"].string_value());
+                auto value = base64_decode(req["value"].string_value());
+                auto lease_id = req["lease"].uint64_value();
+                printf("\\- put: %s = %s, rev %ju, lease %ju\n", key.c_str(), value.c_str(), mod_revision, lease_id);
+                data[key] = {
+                    .value = value,
+                    .mod_revision = mod_revision,
+                    .lease_id = lease_id,
+                };
+                std::string err;
+                json11::Json json_value = json11::Json::parse(value, err);
+                if (err != "")
+                {
+                    fprintf(stderr, "Invalid JSON in etcd key %s during test: %s\n", key.c_str(), value.c_str());
+                    exit(1);
+                }
+                changes[key] = { .key = key, .value = json_value, .mod_revision = mod_revision };
+                responses.push_back(json11::Json::object {
+                    { "response_put", json11::Json::object{ { "header", json11::Json::object{ { "revision", mod_revision } } } } },
+                });
+            }
+            else if (op.find("request_delete_range") != op.end())
+            {
+                auto req = op.at("request_delete_range");
+                auto key = base64_decode(req["key"].string_value());
+                auto range_end = base64_decode(req["range_end"].string_value());
+                uint64_t n_del = 0;
+                for (auto it = data.lower_bound(key); it != data.end() && (range_end == "" || it->first < range_end); )
+                {
+                    auto & key = it->first;
+                    printf("\\- del: %s\n", key.c_str());
+                    changes[key] = { .key = key, .mod_revision = mod_revision };
+                    n_del++;
+                    data.erase(it++);
+                }
+                responses.push_back(json11::Json::object {
+                    { "response_delete_range", json11::Json::object{ { "header", json11::Json::object{ { "revision", mod_revision } } }, { "deleted", n_del } } },
+                });
+            }
+        }
+        callback("", json11::Json::object{
+            { "header", json11::Json::object{ { "revision", mod_revision } } },
+            { "succeeded", ok },
+            { "responses", responses }
+        });
+        // Push changes to watcher
+        if (changes.size())
+        {
+            for (auto & kv: changes)
+                parse_state(kv.second);
+            if (on_change_hook != NULL)
+                on_change_hook(changes);
+        }
+    }
+    else if (api == "/lease/grant")
+    {
+        uint64_t lease_id = (((uint64_t)lrand48()) << 32) | lrand48();
+        leases[lease_id] = payload["TTL"].uint64_value();
+        callback("", json11::Json::object{ { "ID", std::to_string(lease_id) } });
+    }
+    else
+        callback("Unsupported", json11::Json());
+}
+
+void etcd_state_client_mock_t::load_global_config()
+{
+    etcd_state_client_t::load_global_config([this](const std::string & err) {});
+}
+
+void etcd_state_client_mock_t::load_pgs()
+{
+    etcd_state_client_t::load_pgs([this](const std::string & err) {});
+}
@@ -0,0 +1,42 @@
+// Copyright (c) Vitaliy Filippov, 2019+
+// License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
+
+#pragma once
+
+#include "etcd_state_client.h"
+
+struct etcd_mock_key_data_t
+{
+    std::string value;
+    uint64_t mod_revision;
+    uint64_t lease_id;
+};
+
+struct etcd_mock_request_t
+{
+    std::string api;
+    json11::Json payload;
+    int timeout;
+    int retries;
+    int interval;
+    std::function<void(std::string, json11::Json)> callback;
+};
+
+struct etcd_state_client_mock_t: public etcd_state_client_t
+{
+    uint64_t mod_revision = 0;
+    bool paused = false;
+    std::vector<etcd_mock_request_t> queue;
+public:
+    std::map<uint64_t, uint64_t> leases;
+    std::map<std::string, etcd_mock_key_data_t> data;
+    etcd_state_client_mock_t();
+    void set(const std::string& key, json11::Json data, uint64_t mod_revision = 0, uint64_t lease_id = 0);
+    void pause();
+    void resume();
+    void etcd_call_oneshot(std::string etcd_address, std::string api, json11::Json payload, int timeout, std::function<void(std::string, json11::Json)> callback) override;
+    void etcd_call(std::string api, json11::Json payload, int timeout, int retries, int interval, std::function<void(std::string, json11::Json)> callback) override;
+    void etcd_add_watch(json11::Json watch) override;
+    void load_global_config() override;
+    void load_pgs() override;
+};
@@ -38,6 +38,8 @@
 #define MSGR_SENDP_HDR 1
 #define MSGR_SENDP_FREE 2

+#define MAX_SIMPLE_PAYLOAD_SIZE 1048576
+
 struct msgr_sendp_t
 {
    osd_op_t *op;
@@ -181,9 +183,12 @@ public:
    timerfd_manager_t *tfd = NULL;
    ring_loop_i *ringloop = NULL;
    bool has_sendmsg_zc = false;
-    // osd_num_t is only for logging and asserts
    uint64_t next_client_id = 1;
-    osd_num_t osd_num;
+    // osd_num = 0 for client messenger, osd_num > 0 for OSD messenger
+    osd_num_t osd_num = 0;
+    uint32_t clean_entry_bitmap_size = 0;
+    uint32_t bs_block_size = 0;
+    uint32_t max_write_request_size = 0;
    robin_hood::unordered_flat_map<uint64_t, osd_client_t*> clients;
    robin_hood::unordered_flat_map<uint64_t, osd_client_t*> osd_peers;
    robin_hood::unordered_flat_map<int, osd_client_t*> clients_by_fd;
@@ -222,7 +227,7 @@ public:

 #ifdef WITH_RDMA
    bool is_rdma_enabled();
-    bool connect_rdma(uint64_t client_id, std::string rdma_address, uint64_t client_max_msg);
+    json11::Json connect_rdma(uint64_t client_id, std::string rdma_address, uint64_t client_max_msg);
 #endif
 #ifdef WITH_RDMACM
    bool is_use_rdmacm();
@@ -249,7 +254,7 @@ protected:
    bool handle_read(int result, osd_client_t *cl);
    bool handle_read_buffer(osd_client_t *cl, void *curbuf, int remain);
    bool handle_finished_read(osd_client_t *cl);
-    void handle_op_hdr(osd_client_t *cl);
+    bool handle_op_hdr(osd_client_t *cl);
    bool handle_reply_hdr(osd_client_t *cl);
    void handle_reply_ready(osd_op_t *op);
    void handle_immediate_ops();
@@ -3,6 +3,7 @@

 #include <assert.h>

+#include "messenger.h"
 #include "msgr_op.h"

 osd_op_t::~osd_op_t()
@@ -38,3 +39,52 @@ bool osd_op_t::is_recovery_related()
        req.hdr.opcode == OSD_OP_SEC_SYNC &&
        (req.sec_sync.flags & OSD_OP_RECOVERY_RELATED);
 }
+
+void osd_messenger_t::measure_exec(osd_op_t *cur_op)
+{
+    // Measure execution latency
+    if (cur_op->req.hdr.opcode > OSD_OP_MAX)
+    {
+        return;
+    }
+    if (!cur_op->tv_end.tv_sec)
+    {
+        clock_gettime(CLOCK_REALTIME, &cur_op->tv_end);
+    }
+    uint64_t len = 0;
+    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
+        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)
+    {
+        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);
+    }
+}
+
+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;
+}
@@ -165,7 +165,7 @@ struct __attribute__((visibility("default"))) osd_op_t
    // bitmap, bitmap_len, bmp_data are only meaningful for reads
    void *bitmap = NULL;
    unsigned bitmap_len = 0;
-    unsigned bmp_data = 0;
+    size_t bmp_data = 0;
    void *bitmap_buf = NULL;
    void *rmw_buf = NULL;
    osd_primary_op_data_t* op_data = NULL;
@@ -507,7 +507,7 @@ int msgr_rdma_connection_t::connect(msgr_rdma_address_t *dest)
    return 0;
 }

-bool osd_messenger_t::connect_rdma(uint64_t client_id, std::string rdma_address, uint64_t client_max_msg)
+json11::Json osd_messenger_t::connect_rdma(uint64_t client_id, std::string rdma_address, uint64_t client_max_msg)
 {
    // Try to connect to the peer using RDMA
    msgr_rdma_address_t addr;
@@ -523,7 +523,7 @@ bool osd_messenger_t::connect_rdma(uint64_t client_id, std::string rdma_address,
        {
            if (log_level > 0)
                fprintf(stderr, "No RDMA context for peer %ju, using only TCP\n", client_id);
-            return false;
+            return json11::Json();
        }
        msgr_rdma_connection_t *rdma_conn = msgr_rdma_connection_t::create(selected_ctx, rdma_max_send, rdma_max_recv, rdma_max_sge, client_max_msg);
        if (rdma_conn)
@@ -542,11 +542,14 @@ bool osd_messenger_t::connect_rdma(uint64_t client_id, std::string rdma_address,
                // Remember connection, but switch to RDMA only after sending the configuration response
                cl->rdma_conn = rdma_conn;
                cl->peer_state = PEER_RDMA_CONNECTING;
-                return true;
+                return json11::Json::object{
+                    {"rdma_address", rdma_conn->addr.to_string()},
+                    {"rdma_max_msg", rdma_conn->max_msg},
+                };
            }
        }
    }
-    return false;
+    return json11::Json();
 }

 static void try_send_rdma_wr(osd_client_t *cl, ibv_sge *sge, int op_sge)
@@ -231,7 +231,11 @@ bool osd_messenger_t::handle_finished_read(osd_client_t *cl)
                }
                cl->read_op_id++;
            }
-            handle_op_hdr(cl);
+            if (!handle_op_hdr(cl))
+            {
+                stop_client(cl->client_id);
+                return false;
+            }
        }
        else
        {
@@ -262,7 +266,7 @@ bool osd_messenger_t::handle_finished_read(osd_client_t *cl)
    return true;
 }

-void osd_messenger_t::handle_op_hdr(osd_client_t *cl)
+bool osd_messenger_t::handle_op_hdr(osd_client_t *cl)
 {
    osd_op_t *cur_op = cl->read_op;
    if (cur_op->req.hdr.opcode == OSD_OP_SEC_READ)
@@ -274,7 +278,16 @@ void osd_messenger_t::handle_op_hdr(osd_client_t *cl)
    {
        if (cur_op->req.sec_rw.attr_len > 0)
        {
-            if (cur_op->req.sec_rw.attr_len > sizeof(unsigned))
+            if (cur_op->req.sec_rw.attr_len > clean_entry_bitmap_size)
+            {
+                if (log_level > 1)
+                {
+                    fprintf(stderr, "Error: peer %ju secondary write request attr_len too large (%u > %u bytes), stopping\n", cl->client_id,
+                        cur_op->req.sec_rw.attr_len, clean_entry_bitmap_size);
+                }
+                return false;
+            }
+            else if (cur_op->req.sec_rw.attr_len > sizeof(cur_op->bmp_data))
                cur_op->bitmap = cur_op->rmw_buf = malloc_or_die(cur_op->req.sec_rw.attr_len);
            else
                cur_op->bitmap = &cur_op->bmp_data;
@@ -282,6 +295,15 @@ void osd_messenger_t::handle_op_hdr(osd_client_t *cl)
        }
        if (cur_op->req.sec_rw.len > 0)
        {
+            if (cur_op->req.sec_rw.len > bs_block_size)
+            {
+                if (log_level > 1)
+                {
+                    fprintf(stderr, "Error: peer %ju secondary write request size too large (%u > %u bytes), stopping\n", cl->client_id,
+                        cur_op->req.sec_rw.len, bs_block_size);
+                }
+                return false;
+            }
            cur_op->buf = memalign_or_die(MEM_ALIGNMENT, cur_op->req.sec_rw.len);
            cl->recv_list.push_back(cur_op->buf, cur_op->req.sec_rw.len);
        }
@@ -292,6 +314,15 @@ void osd_messenger_t::handle_op_hdr(osd_client_t *cl)
    {
        if (cur_op->req.sec_stab.len > 0)
        {
+            if (cur_op->req.sec_stab.len > MAX_SIMPLE_PAYLOAD_SIZE)
+            {
+                if (log_level > 1)
+                {
+                    fprintf(stderr, "Error: peer %ju stabilize request size too large (%lu > %u bytes), stopping\n", cl->client_id,
+                        cur_op->req.sec_stab.len, MAX_SIMPLE_PAYLOAD_SIZE);
+                }
+                return false;
+            }
            cur_op->buf = memalign_or_die(MEM_ALIGNMENT, cur_op->req.sec_stab.len);
            cl->recv_list.push_back(cur_op->buf, cur_op->req.sec_stab.len);
        }
@@ -301,6 +332,15 @@ void osd_messenger_t::handle_op_hdr(osd_client_t *cl)
    {
        if (cur_op->req.sec_read_bmp.len > 0)
        {
+            if (cur_op->req.sec_read_bmp.len > MAX_SIMPLE_PAYLOAD_SIZE)
+            {
+                if (log_level > 1)
+                {
+                    fprintf(stderr, "Error: peer %ju sec_read_bmp request size too large (%lu > %u bytes), stopping\n", cl->client_id,
+                        cur_op->req.sec_read_bmp.len, MAX_SIMPLE_PAYLOAD_SIZE);
+                }
+                return false;
+            }
            cur_op->buf = memalign_or_die(MEM_ALIGNMENT, cur_op->req.sec_read_bmp.len);
            cl->recv_list.push_back(cur_op->buf, cur_op->req.sec_read_bmp.len);
        }
@@ -310,6 +350,15 @@ void osd_messenger_t::handle_op_hdr(osd_client_t *cl)
    {
        if (cur_op->req.rw.len > 0)
        {
+            if (cur_op->req.rw.len > max_write_request_size)
+            {
+                if (log_level > 1)
+                {
+                    fprintf(stderr, "Error: peer %ju write request size too large (%u > %u bytes), stopping\n", cl->client_id,
+                        cur_op->req.rw.len, max_write_request_size);
+                }
+                return false;
+            }
            cur_op->buf = memalign_or_die(MEM_ALIGNMENT, cur_op->req.rw.len);
            cl->recv_list.push_back(cur_op->buf, cur_op->req.rw.len);
        }
@@ -319,6 +368,15 @@ void osd_messenger_t::handle_op_hdr(osd_client_t *cl)
    {
        if (cur_op->req.show_conf.json_len > 0)
        {
+            if (cur_op->req.show_conf.json_len > MAX_SIMPLE_PAYLOAD_SIZE)
+            {
+                if (log_level > 1)
+                {
+                    fprintf(stderr, "Error: peer %ju show_config request length too large (%lu > %u bytes), stopping\n", cl->client_id,
+                        cur_op->req.show_conf.json_len, MAX_SIMPLE_PAYLOAD_SIZE);
+                }
+                return false;
+            }
            cur_op->buf = malloc_or_die(cur_op->req.show_conf.json_len+1);
            ((uint8_t*)cur_op->buf)[cur_op->req.show_conf.json_len] = 0;
            cl->recv_list.push_back(cur_op->buf, cur_op->req.show_conf.json_len);
@@ -344,6 +402,7 @@ void osd_messenger_t::handle_op_hdr(osd_client_t *cl)
        cl->read_op = NULL;
        cl->read_state = 0;
    }
+    return true;
 }

 bool osd_messenger_t::handle_reply_hdr(osd_client_t *cl)
@@ -140,55 +140,6 @@ 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
-    if (cur_op->req.hdr.opcode > OSD_OP_MAX)
-    {
-        return;
-    }
-    if (!cur_op->tv_end.tv_sec)
-    {
-        clock_gettime(CLOCK_REALTIME, &cur_op->tv_end);
-    }
-    uint64_t len = 0;
-    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
-        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)
-    {
-        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);
-    }
-}
-
 bool osd_messenger_t::try_send(osd_client_t *cl)
 {
    if (!cl->send_list.size() || cl->write_msg.msg_iovlen > 0 || cl->peer_state == PEER_STOPPED || cl->peer_fd < 0)
@@ -301,10 +301,9 @@ const char *help_text =
    "     --nbd_disconnect_on_close 1\n"
    "       Disconnect the nbd device on close by last opener.\n"
 #endif
-#ifdef NBD_FLAG_READ_ONLY
+    "     --readonly\n"
    "     --nbd_ro 1\n"
    "       Set device into read only mode.\n"
-#endif
    "\n"
    "vitastor-nbd netlink-unmap /dev/nbdN\n"
    "  Unmap a device using netlink interface. Works with both netlink and ioctl mapped devices.\n"
@@ -348,6 +347,7 @@ protected:
    int read_ready = 0;
    msghdr read_msg = { 0 }, send_msg = { 0 };
    iovec read_iov = { 0 };
+    bool stop = false;

    std::string logfile = "/dev/null";

@@ -514,7 +514,7 @@ help:
        // Create client
        ringloop = new ring_loop_t(RINGLOOP_DEFAULT_SIZE);
        epmgr = new epoll_manager_t(ringloop);
-        cli = new cluster_client_t(ringloop, epmgr->tfd, cfg);
+        cli = cluster_client_t::create(ringloop, epmgr->tfd, cfg);
        if (!inode)
        {
            // Load image metadata
@@ -525,7 +525,7 @@ help:
                    break;
                ringloop->wait();
            }
-            watch = cli->st_cli.watch_inode(image_name);
+            watch = cli->st_cli->watch_inode(image_name);
            device_size = watch->cfg.size;
            if (!watch->cfg.num || !device_size)
            {
@@ -581,10 +581,8 @@ help:
            }
            uint64_t flags = NBD_FLAG_SEND_FLUSH;
            uint64_t cflags = 0;
-#ifdef NBD_FLAG_READ_ONLY
-            if (!cfg["nbd_ro"].is_null())
+            if (!cfg["readonly"].is_null() || !cfg["nbd_ro"].is_null())
                flags |= NBD_FLAG_READ_ONLY;
-#endif
 #ifdef NBD_CFLAG_DESTROY_ON_DISCONNECT
            if (!cfg["nbd_destroy_on_disconnect"].is_null())
                cflags |= NBD_CFLAG_DESTROY_ON_DISCONNECT;
@@ -620,7 +618,10 @@ help:
            if (!cfg["dev_num"].is_null())
            {
                int r;
-                if ((r = run_nbd(sockfd, cfg["dev_num"].int64_value(), device_size, NBD_FLAG_SEND_FLUSH, nbd_timeout, bg)) != 0)
+                uint64_t flags = NBD_FLAG_SEND_FLUSH;
+                if (!cfg["readonly"].is_null())
+                    flags |= NBD_FLAG_READ_ONLY;
+                if ((r = run_nbd(sockfd, cfg["dev_num"].int64_value(), device_size, flags, nbd_timeout, bg)) != 0)
                {
                    fprintf(stderr, "run_nbd: %s\n", strerror(-r));
                    exit(1);
@@ -678,8 +679,7 @@ help:
        };
        ringloop->register_consumer(&consumer);
        // Add FD to epoll
-        bool stop = false;
-        epmgr->tfd->set_fd_handler(sockfd[0], false, [this, &stop](int peer_fd, int epoll_events)
+        epmgr->tfd->set_fd_handler(sockfd[0], false, [this](int peer_fd, int epoll_events)
        {
            if (epoll_events & EPOLLRDHUP)
            {
@@ -1118,7 +1118,8 @@ protected:
            {
                // Disconnect
                close(nbd_fd);
-                exit(0);
+                stop = true;
+                return;
            }
            if (be32toh(cur_req.magic) != NBD_REQUEST_MAGIC ||
                req_type != NBD_CMD_READ && req_type != NBD_CMD_WRITE && req_type != NBD_CMD_FLUSH)
@@ -705,6 +705,54 @@ static void vitastor_close(BlockDriverState *bs)
    client->last_bitmap = NULL;
 }

+// Unregister all event sources from the current AioContext. Called by the
+// block layer before bs is moved to a different AioContext (e.g. during live
+// migration, drain, dataplane switching). The block layer guarantees that no
+// requests are in flight at this point.
+static void vitastor_detach_aio_context(BlockDriverState *bs)
+{
+    VitastorClient *client = bs->opaque;
+    int i;
+#if defined VITASTOR_C_API_VERSION && VITASTOR_C_API_VERSION >= 2
+    if (client->uring_eventfd >= 0)
+    {
+        universal_aio_set_fd_handler(client->ctx, client->uring_eventfd, NULL, NULL, NULL);
+        // Wait until any scheduled B/H is processed before switching contexts:
+        // it would otherwise fire on the old context with stale state.
+        if (client->bh_uring_scheduled)
+        {
+            BDRV_POLL_WHILE(bs, client->bh_uring_scheduled);
+        }
+    }
+#endif
+    for (i = 0; i < client->fd_count; i++)
+    {
+        universal_aio_set_fd_handler(client->ctx, client->fds[i]->fd, NULL, NULL, NULL);
+    }
+}
+
+// (Re-)register all event sources on the new AioContext.
+static void vitastor_attach_aio_context(BlockDriverState *bs, AioContext *new_ctx)
+{
+    VitastorClient *client = bs->opaque;
+    int i;
+    client->ctx = new_ctx;
+#if defined VITASTOR_C_API_VERSION && VITASTOR_C_API_VERSION >= 2
+    if (client->uring_eventfd >= 0)
+    {
+        universal_aio_set_fd_handler(new_ctx, client->uring_eventfd, vitastor_uring_handler, NULL, client);
+    }
+#endif
+    for (i = 0; i < client->fd_count; i++)
+    {
+        VitastorFdData *fdd = client->fds[i];
+        universal_aio_set_fd_handler(new_ctx, fdd->fd,
+            fdd->fd_read ? vitastor_aio_fd_read : NULL,
+            fdd->fd_write ? vitastor_aio_fd_write : NULL,
+            fdd);
+    }
+}
+
 #if QEMU_VERSION_MAJOR >= 3 || QEMU_VERSION_MAJOR == 2 && QEMU_VERSION_MINOR >= 2
 static void vitastor_refresh_filename(BlockDriverState *bs)
 {
@@ -832,6 +880,25 @@ static int vitastor_refresh_limits(BlockDriverState *bs)
 //    return 0;
 //}

+// Move the running coroutine to the BlockDriverState's home AioContext.
+//
+// The block-coroutine-wrapper generator sets poll_state.ctx to
+// qemu_get_current_aio_context() in the sync wrappers (bdrv_flush(),
+// bdrv_pread() etc.). When bdrv_flush_all() runs under BQL from outside the
+// bs's iothread (e.g. on the migration thread inside do_vm_stop()), that is
+// the main AioContext, not the iothread that actually owns the bs. The
+// coroutine then runs on the wrong context while completions are delivered on
+// the iothread, and racing aio_co_schedule() vs. qemu_aio_coroutine_enter()
+// on the same coroutine triggers "Co-routine was already scheduled in
+// aio_co_schedule" and aborts the process (observed during live migration).
+//
+// aio_co_reschedule_self() is a no-op when we are already on the target ctx.
+#if QEMU_VERSION_MAJOR > 5 || QEMU_VERSION_MAJOR == 5 && QEMU_VERSION_MINOR >= 2
+#define vitastor_co_pin_to_bs_ctx(bs) aio_co_reschedule_self(bdrv_get_aio_context(bs))
+#else
+#define vitastor_co_pin_to_bs_ctx(bs) ((void)0)
+#endif
+
 static void vitastor_co_init_task(BlockDriverState *bs, VitastorRPC *task)
 {
    *task = (VitastorRPC) {
@@ -890,6 +957,7 @@ static int coroutine_fn vitastor_co_preadv(BlockDriverState *bs,
 {
    VitastorClient *client = bs->opaque;
    VitastorRPC task;
+    vitastor_co_pin_to_bs_ctx(bs);
    vitastor_co_init_task(bs, &task);
    task.iov = iov;

@@ -918,6 +986,7 @@ static int coroutine_fn vitastor_co_pwritev(BlockDriverState *bs,
 {
    VitastorClient *client = bs->opaque;
    VitastorRPC task;
+    vitastor_co_pin_to_bs_ctx(bs);
    vitastor_co_init_task(bs, &task);
    task.iov = iov;

@@ -991,6 +1060,7 @@ static int coroutine_fn vitastor_co_block_status(BlockDriverState *bs,
 #endif
    VitastorRPC task;
    VitastorClient *client = bs->opaque;
+    vitastor_co_pin_to_bs_ctx(bs);
    uint64_t inode = client->watch ? vitastor_c_inode_get_num(client->watch) : client->inode;
    uint8_t bit = 0;
    if (client->last_bitmap && client->last_bitmap_inode == inode &&
@@ -1103,6 +1173,7 @@ static int coroutine_fn vitastor_co_flush(BlockDriverState *bs)
 {
    VitastorClient *client = bs->opaque;
    VitastorRPC task;
+    vitastor_co_pin_to_bs_ctx(bs);
    vitastor_co_init_task(bs, &task);

    qemu_mutex_lock(&client->mutex);
@@ -1188,6 +1259,11 @@ static BlockDriver bdrv_vitastor = {
 #endif
    .bdrv_close                     = vitastor_close,

+    // Re-register fd handlers when the bs is moved to a different AioContext
+    // (live migration, drain, iothread reassignment).
+    .bdrv_detach_aio_context        = vitastor_detach_aio_context,
+    .bdrv_attach_aio_context        = vitastor_attach_aio_context,
+
    // Option list for the create operation
 #if QEMU_VERSION_MAJOR >= 3 || QEMU_VERSION_MAJOR == 2 && QEMU_VERSION_MINOR > 0
    .create_opts                    = &vitastor_create_opts,
@@ -62,6 +62,13 @@ const char *help_text =
    "All usual Vitastor config options like --config_path <path_to_config> may also be specified in CLI.\n"
 ;

+struct ublk_request
+{
+    uint64_t ublk_cmd;
+    int index;
+    int result;
+};
+
 class ublk_server
 {
 protected:
@@ -241,7 +248,7 @@ help:

        // Create client
        epmgr = new epoll_manager_t(ringloop);
-        cli = new cluster_client_t(ringloop, epmgr->tfd, cfg);
+        cli = cluster_client_t::create(ringloop, epmgr->tfd, cfg);

        // cli->config contains merged config
        if (!cfg["queue_depth"].is_null())
@@ -273,7 +280,7 @@ help:
        }
        if (!inode)
        {
-            watch = cli->st_cli.watch_inode(image_name);
+            watch = cli->st_cli->watch_inode(image_name);
            device_size = watch->cfg.size;
            if (!watch->cfg.num || !device_size)
            {
@@ -282,9 +289,9 @@ help:
                exit(1);
            }
        }
-        const bool writeback = !cli->get_immediate_commit(inode);
-        auto pool_it = cli->st_cli.pool_config.find(INODE_POOL(inode ? inode : watch->cfg.num));
-        if (pool_it == cli->st_cli.pool_config.end())
+        const bool writeback = !cli->get_immediate_commit(inode ? inode : watch->cfg.num);
+        auto pool_it = cli->st_cli->pool_config.find(INODE_POOL(inode ? inode : watch->cfg.num));
+        if (pool_it == cli->st_cli->pool_config.end())
        {
            fprintf(stderr, "Pool %u does not exist\n", INODE_POOL(inode ? inode : watch->cfg.num));
            exit(1);
@@ -331,6 +338,11 @@ help:
            daemonize_fork(notifyfd);
            close(notifyfd[0]);
        }
+        consumer.loop = [this]()
+        {
+            submit_postponed();
+        };
+        ringloop->register_consumer(&consumer);
        start_device(recover);
        if (pidfile != "")
            write_pid();
@@ -350,6 +362,7 @@ help:
            ringloop->wait();
        }
        cli->flush();
+        ringloop->unregister_consumer(&consumer);
        delete cli;
        delete epmgr;
        cli = NULL;
@@ -553,6 +566,8 @@ protected:
    ublksrv_ctrl_dev_info ublk_dev = {};
    ublksrv_io_desc *ublk_queue = NULL;
    std::vector<uint8_t*> buffers;
+    ring_consumer_t consumer;
+    std::vector<ublk_request> postponed_requests;

    void open_control()
    {
@@ -734,9 +749,19 @@ protected:
        ctrl_fd = -1;
    }

-    void submit_request(uint64_t ublk_cmd, int i, int res)
+    bool submit_request(uint64_t ublk_cmd, int i, int res)
    {
        io_uring_sqe *sqe = ringloop->get_sqe();
+        if (!sqe)
+        {
+            // Handle full io_uring by postponing the request
+            postponed_requests.push_back((ublk_request){
+                .ublk_cmd = ublk_cmd,
+                .index = i,
+                .result = res,
+            });
+            return false;
+        }
        ring_data_t* data = ((ring_data_t*)sqe->user_data);
        sqe->fd = cdev_fd;
        sqe->opcode = IORING_OP_URING_CMD;
@@ -750,6 +775,22 @@ protected:
        cmd->addr = (uint64_t)buffers[i];
        cmd->result = res;
        data->callback = [this, i](ring_data_t *data) { exec_request(data->res, i); };
+        return true;
+    }
+
+    void submit_postponed()
+    {
+        int sent = 0;
+        while (postponed_requests.size())
+        {
+            ublk_request r = postponed_requests.back();
+            postponed_requests.pop_back();
+            if (!submit_request(r.ublk_cmd, r.index, r.result))
+                break;
+            sent++;
+        }
+        if (sent)
+            ringloop->submit();
    }

    void exec_request(int res, int i)
@@ -864,6 +905,11 @@ protected:
    int sync_ublk_cmd(uint32_t cmd_op, void *addr, uint32_t len, uint16_t dev_path_len = 0, uint64_t data0 = 0)
    {
        io_uring_sqe *sqe = ringloop->get_sqe();
+        if (!sqe)
+        {
+            fprintf(stderr, "Error: io_uring is full when trying to execute a control command\n");
+            exit(1);
+        }
        sqe->fd = ctrl_fd;
        sqe->opcode = IORING_OP_URING_CMD;
        sqe->ioprio = 0;
@@ -6,7 +6,7 @@ includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@

 Name: Vitastor
 Description: Vitastor client library
-Version: 3.0.13
+Version: 3.0.15
 Libs: -L${libdir} -lvitastor_client
 Cflags: -I${includedir}

@@ -103,7 +103,7 @@ vitastor_c *vitastor_c_create_qemu(QEMUSetFDHandler *aio_set_fd_handler, void *a
        rdma_device, rdma_port_num, rdma_gid_index, rdma_mtu, log_level
    );
    auto self = vitastor_c_create_qemu_common(aio_set_fd_handler, aio_context);
-    self->cli = new cluster_client_t(NULL, self->tfd, cfg_json);
+    self->cli = cluster_client_t::create(NULL, self->tfd, cfg_json);
    return self;
 }

@@ -126,7 +126,7 @@ vitastor_c *vitastor_c_create_qemu_uring(QEMUSetFDHandler *aio_set_fd_handler, v
    );
    auto self = vitastor_c_create_qemu_common(aio_set_fd_handler, aio_context);
    self->ringloop = ringloop;
-    self->cli = new cluster_client_t(self->ringloop, self->tfd, cfg_json);
+    self->cli = cluster_client_t::create(self->ringloop, self->tfd, cfg_json);
    ringloop->loop();
    return self;
 }
@@ -150,7 +150,7 @@ vitastor_c *vitastor_c_create_uring(const char *config_path, const char *etcd_ho
    vitastor_c *self = new vitastor_c;
    self->ringloop = ringloop;
    self->epmgr = new epoll_manager_t(self->ringloop);
-    self->cli = new cluster_client_t(self->ringloop, self->epmgr->tfd, cfg_json);
+    self->cli = cluster_client_t::create(self->ringloop, self->epmgr->tfd, cfg_json);
    ringloop->loop();
    return self;
 }
@@ -191,7 +191,7 @@ vitastor_c *vitastor_c_create_uring_json(const char **options, int options_len)
    vitastor_c *self = new vitastor_c;
    self->ringloop = ringloop;
    self->epmgr = new epoll_manager_t(self->ringloop);
-    self->cli = new cluster_client_t(self->ringloop, self->epmgr->tfd, cfg_json);
+    self->cli = cluster_client_t::create(self->ringloop, self->epmgr->tfd, cfg_json);
    ringloop->loop();
    return self;
 }
@@ -206,7 +206,7 @@ vitastor_c *vitastor_c_create_epoll_json(const char **options, int options_len)
    json11::Json cfg_json(cfg);
    vitastor_c *self = new vitastor_c;
    self->epmgr = new epoll_manager_t(NULL);
-    self->cli = new cluster_client_t(NULL, self->epmgr->tfd, cfg_json);
+    self->cli = cluster_client_t::create(NULL, self->epmgr->tfd, cfg_json);
    return self;
 }

@@ -396,7 +396,7 @@ void vitastor_c_watch_inode(vitastor_c *client, char *image, VitastorIOHandler c
 {
    client->cli->on_ready([=]()
    {
-        auto watch = client->cli->st_cli.watch_inode(std::string(image));
+        auto watch = client->cli->st_cli->watch_inode(std::string(image));
        cb(opaque, (long)watch);
    });
    if (client->ringloop)
@@ -407,7 +407,7 @@ void vitastor_c_watch_inode(vitastor_c *client, char *image, VitastorIOHandler c

 void vitastor_c_close_watch(vitastor_c *client, void *handle)
 {
-    client->cli->st_cli.close_watch((inode_watch_t*)handle);
+    client->cli->st_cli->close_watch((inode_watch_t*)handle);
 }

 uint64_t vitastor_c_inode_get_size(void *handle)
@@ -424,8 +424,8 @@ uint64_t vitastor_c_inode_get_num(void *handle)

 uint32_t vitastor_c_inode_get_block_size(vitastor_c *client, uint64_t inode_num)
 {
-    auto pool_it = client->cli->st_cli.pool_config.find(INODE_POOL(inode_num));
-    if (pool_it == client->cli->st_cli.pool_config.end())
+    auto pool_it = client->cli->st_cli->pool_config.find(INODE_POOL(inode_num));
+    if (pool_it == client->cli->st_cli->pool_config.end())
        return 0;
    auto & pool_cfg = pool_it->second;
    uint32_t pg_data_size = (pool_cfg.scheme == POOL_SCHEME_REPLICATED ? 1 : pool_cfg.pg_size-pool_cfg.parity_chunks);
@@ -434,8 +434,8 @@ uint32_t vitastor_c_inode_get_block_size(vitastor_c *client, uint64_t inode_num)

 uint32_t vitastor_c_inode_get_bitmap_granularity(vitastor_c *client, uint64_t inode_num)
 {
-    auto pool_it = client->cli->st_cli.pool_config.find(INODE_POOL(inode_num));
-    if (pool_it == client->cli->st_cli.pool_config.end())
+    auto pool_it = client->cli->st_cli->pool_config.find(INODE_POOL(inode_num));
+    if (pool_it == client->cli->st_cli->pool_config.end())
        return 0;
    // FIXME: READ_BITMAP may fails if parent bitmap granularity differs from inode bitmap granularity
    return pool_it->second.bitmap_granularity;
@@ -471,8 +471,8 @@ uint64_t vitastor_c_inode_get_mod_revision(void *handle)

 uint32_t vitastor_c_inode_get_immediate_commit(vitastor_c *client, uint64_t inode_num)
 {
-    auto pool_it = client->cli->st_cli.pool_config.find(INODE_POOL(inode_num));
-    if (pool_it == client->cli->st_cli.pool_config.end())
+    auto pool_it = client->cli->st_cli->pool_config.find(INODE_POOL(inode_num));
+    if (pool_it == client->cli->st_cli->pool_config.end())
        return 0;
    return pool_it->second.immediate_commit;
 }
@@ -555,7 +555,7 @@ static int run(cli_tool_t *p, json11::Json::object cfg)
        json11::Json cfg_j = cfg;
        p->ringloop = new ring_loop_t(RINGLOOP_DEFAULT_SIZE);
        p->epmgr = new epoll_manager_t(p->ringloop);
-        p->cli = new cluster_client_t(p->ringloop, p->epmgr->tfd, cfg_j);
+        p->cli = cluster_client_t::create(p->ringloop, p->epmgr->tfd, cfg_j);
        p->loop_and_wait(action_cb, [&](const cli_result_t & r)
        {
            result = r;
@@ -35,7 +35,7 @@ struct alloc_osd_t
                        { "target", "VERSION" },
                        { "version", 0 },
                        { "key", base64_encode(
-                            parent->cli->st_cli.etcd_prefix+"/osd/stats/"+std::to_string(new_id)
+                            parent->cli->st_cli->etcd_prefix+"/osd/stats/"+std::to_string(new_id)
                        ) },
                    },
                } },
@@ -43,7 +43,7 @@ struct alloc_osd_t
                    json11::Json::object {
                        { "request_put", json11::Json::object {
                            { "key", base64_encode(
-                                parent->cli->st_cli.etcd_prefix+"/osd/stats/"+std::to_string(new_id)
+                                parent->cli->st_cli->etcd_prefix+"/osd/stats/"+std::to_string(new_id)
                            ) },
                            { "value", base64_encode("{}") },
                        } },
@@ -52,8 +52,8 @@ struct alloc_osd_t
                { "failure", json11::Json::array {
                    json11::Json::object {
                        { "request_range", json11::Json::object {
-                            { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/osd/stats/") },
-                            { "range_end", base64_encode(parent->cli->st_cli.etcd_prefix+"/osd/stats0") },
+                            { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/osd/stats/") },
+                            { "range_end", base64_encode(parent->cli->st_cli->etcd_prefix+"/osd/stats0") },
                            { "keys_only", true },
                        } },
                    },
@@ -8,8 +8,8 @@

 void cli_tool_t::change_parent(inode_t cur, inode_t new_parent, cli_result_t *result)
 {
-    auto cur_cfg_it = cli->st_cli.inode_config.find(cur);
-    if (cur_cfg_it == cli->st_cli.inode_config.end())
+    auto cur_cfg_it = cli->st_cli->inode_config.find(cur);
+    if (cur_cfg_it == cli->st_cli->inode_config.end())
    {
        char buf[128];
        snprintf(buf, 128, "Inode 0x%jx disappeared", cur);
@@ -18,13 +18,13 @@ void cli_tool_t::change_parent(inode_t cur, inode_t new_parent, cli_result_t *re
    }
    inode_config_t new_cfg = cur_cfg_it->second;
    std::string cur_name = new_cfg.name;
-    std::string cur_cfg_key = base64_encode(cli->st_cli.etcd_prefix+
+    std::string cur_cfg_key = base64_encode(cli->st_cli->etcd_prefix+
        "/config/inode/"+std::to_string(INODE_POOL(cur))+
        "/"+std::to_string(INODE_NO_POOL(cur)));
    new_cfg.parent_id = new_parent;
-    json11::Json::object cur_cfg_json = cli->st_cli.serialize_inode_cfg(&new_cfg);
+    json11::Json::object cur_cfg_json = cli->st_cli->serialize_inode_cfg(&new_cfg);
    waiting++;
-    cli->st_cli.etcd_txn_slow(json11::Json::object {
+    cli->st_cli->etcd_txn_slow(json11::Json::object {
        { "compare", json11::Json::array {
            json11::Json::object {
                { "target", "MOD" },
@@ -53,8 +53,8 @@ void cli_tool_t::change_parent(inode_t cur, inode_t new_parent, cli_result_t *re
        }
        else if (new_parent)
        {
-            auto new_parent_it = cli->st_cli.inode_config.find(new_parent);
-            std::string new_parent_name = new_parent_it != cli->st_cli.inode_config.end()
+            auto new_parent_it = cli->st_cli->inode_config.find(new_parent);
+            std::string new_parent_name = new_parent_it != cli->st_cli->inode_config.end()
                ? new_parent_it->second.name : "<unknown>";
            *result = (cli_result_t){
                .text = "Parent of layer "+cur_name+" (inode "+std::to_string(INODE_NO_POOL(cur))+
@@ -77,7 +77,7 @@ void cli_tool_t::change_parent(inode_t cur, inode_t new_parent, cli_result_t *re
 void cli_tool_t::etcd_txn(json11::Json txn)
 {
    waiting++;
-    cli->st_cli.etcd_txn_slow(txn, [this](std::string err, json11::Json res)
+    cli->st_cli->etcd_txn_slow(txn, [this](std::string err, json11::Json res)
    {
        waiting--;
        if (err != "")
@@ -91,7 +91,7 @@ void cli_tool_t::etcd_txn(json11::Json txn)

 inode_config_t* cli_tool_t::get_inode_cfg(const std::string & name)
 {
-    for (auto & ic: cli->st_cli.inode_config)
+    for (auto & ic: cli->st_cli->inode_config)
    {
        if (ic.second.name == name)
        {
@@ -171,11 +171,11 @@ void cli_tool_t::iterate_kvs_1(json11::Json kvs, const std::string & prefix, std
    bool is_pool = prefix == "/pool/stats/";
    for (auto & kv_item: kvs.array_items())
    {
-        auto kv = cli->st_cli.parse_etcd_kv(kv_item);
+        auto kv = cli->st_cli->parse_etcd_kv(kv_item);
        uint64_t num = 0;
        char null_byte = 0;
        // OSD or pool number
-        int scanned = sscanf(kv.key.substr(cli->st_cli.etcd_prefix.size() + prefix.size()).c_str(), "%ju%c", &num, &null_byte);
+        int scanned = sscanf(kv.key.substr(cli->st_cli->etcd_prefix.size() + prefix.size()).c_str(), "%ju%c", &num, &null_byte);
        if (scanned != 1 || !num || is_pool && num >= POOL_ID_MAX)
        {
            fprintf(stderr, "Invalid key in etcd: %s\n", kv.key.c_str());
@@ -190,12 +190,12 @@ void cli_tool_t::iterate_kvs_2(json11::Json kvs, const std::string & prefix, std
    bool is_inode = prefix == "/config/inode/" || prefix == "/inode/stats/";
    for (auto & kv_item: kvs.array_items())
    {
-        auto kv = cli->st_cli.parse_etcd_kv(kv_item);
+        auto kv = cli->st_cli->parse_etcd_kv(kv_item);
        pool_id_t pool_id = 0;
        uint64_t num = 0;
        char null_byte = 0;
        // pool+pg or pool+inode
-        int scanned = sscanf(kv.key.substr(cli->st_cli.etcd_prefix.size() + prefix.size()).c_str(),
+        int scanned = sscanf(kv.key.substr(cli->st_cli->etcd_prefix.size() + prefix.size()).c_str(),
            "%u/%ju%c", &pool_id, &num, &null_byte);
        if (scanned != 2 || !pool_id || is_inode && INODE_POOL(num) || !is_inode && num >= UINT32_MAX)
        {
@@ -46,7 +46,7 @@ struct image_creator_t

    void loop()
    {
-        auto & pools = parent->cli->st_cli.pool_config;
+        auto & pools = parent->cli->st_cli->pool_config;
        if (state >= 1)
            goto resume_1;
        if (image_name == "")
@@ -117,7 +117,7 @@ struct image_creator_t
            goto resume_2;
        else if (state == 3)
            goto resume_3;
-        for (auto & ic: parent->cli->st_cli.inode_config)
+        for (auto & ic: parent->cli->st_cli->inode_config)
        {
            if (ic.second.name == image_name)
            {
@@ -193,7 +193,7 @@ resume_3:
        } while (!parent->etcd_result["succeeded"].bool_value());
        // Save into inode_config for library users to be able to take it from there immediately
        new_cfg.mod_revision = parent->etcd_result["header"]["revision"].uint64_value();
-        parent->cli->st_cli.insert_inode_config(new_cfg);
+        parent->cli->st_cli->insert_inode_config(new_cfg);
        result = (cli_result_t){
            .err = 0,
            .text = "Image "+image_name+" created",
@@ -215,8 +215,8 @@ resume_3:
            goto resume_3;
        else if (state == 4)
            goto resume_4;
-        // FIXME: take all info from etcd requests, not mixed with st_cli.inode_config
-        for (auto & ic: parent->cli->st_cli.inode_config)
+        // FIXME: take all info from etcd requests, not mixed with st_cli->inode_config
+        for (auto & ic: parent->cli->st_cli->inode_config)
        {
            if (ic.second.name == image_name+"@"+new_snap)
            {
@@ -271,7 +271,7 @@ resume_4:
        } while (!parent->etcd_result["succeeded"].bool_value());
        // Save into inode_config for library users to be able to take it from there immediately
        new_cfg.mod_revision = parent->etcd_result["header"]["revision"].uint64_value();
-        parent->cli->st_cli.insert_inode_config(new_cfg);
+        parent->cli->st_cli->insert_inode_config(new_cfg);
        result = (cli_result_t){
            .err = 0,
            .text = "Snapshot "+image_name+"@"+new_snap+" created",
@@ -291,7 +291,7 @@ resume_4:
        return json11::Json::object {
            { "request_range", json11::Json::object {
                { "key", base64_encode(
-                    parent->cli->st_cli.etcd_prefix+"/index/maxid/"+std::to_string(new_pool_id)
+                    parent->cli->st_cli->etcd_prefix+"/index/maxid/"+std::to_string(new_pool_id)
                ) },
            } },
        };
@@ -303,13 +303,13 @@ resume_4:
        max_id_mod_rev = 0;
        if (response["response_range"]["kvs"].array_items().size() > 0)
        {
-            auto kv = parent->cli->st_cli.parse_etcd_kv(response["response_range"]["kvs"][0]);
+            auto kv = parent->cli->st_cli->parse_etcd_kv(response["response_range"]["kvs"][0]);
            new_id = 1+INODE_NO_POOL(kv.value.uint64_value());
            max_id_mod_rev = kv.mod_revision;
        }
        // Also check existing inodes - for the case when some inodes are created without changing /index/maxid
-        auto ino_it = parent->cli->st_cli.inode_config.lower_bound(INODE_WITH_POOL(new_pool_id+1, 0));
-        if (ino_it != parent->cli->st_cli.inode_config.begin())
+        auto ino_it = parent->cli->st_cli->inode_config.lower_bound(INODE_WITH_POOL(new_pool_id+1, 0));
+        if (ino_it != parent->cli->st_cli->inode_config.begin())
        {
            ino_it--;
            if (INODE_POOL(ino_it->first) == new_pool_id && new_id < 1+INODE_NO_POOL(ino_it->first))
@@ -325,7 +325,7 @@ resume_4:
            goto resume_3;
        if (!new_pool_id)
        {
-            for (auto & ic: parent->cli->st_cli.inode_config)
+            for (auto & ic: parent->cli->st_cli->inode_config)
            {
                if (ic.second.name == image_name)
                {
@@ -339,7 +339,7 @@ resume_4:
            json11::Json::object {
                { "request_range", json11::Json::object {
                    { "key", base64_encode(
-                        parent->cli->st_cli.etcd_prefix+"/index/image/"+image_name
+                        parent->cli->st_cli->etcd_prefix+"/index/image/"+image_name
                    ) },
                } },
            },
@@ -360,7 +360,7 @@ resume_2:
        cfg_mod_rev = idx_mod_rev = 0;
        if (parent->etcd_result["responses"][1]["response_range"]["kvs"].array_items().size() == 0)
        {
-            for (auto & ic: parent->cli->st_cli.inode_config)
+            for (auto & ic: parent->cli->st_cli->inode_config)
            {
                if (ic.second.name == image_name)
                {
@@ -377,7 +377,7 @@ resume_2:
        {
            // FIXME: Parse kvs in etcd_state_client automatically
            {
-                auto kv = parent->cli->st_cli.parse_etcd_kv(parent->etcd_result["responses"][1]["response_range"]["kvs"][0]);
+                auto kv = parent->cli->st_cli->parse_etcd_kv(parent->etcd_result["responses"][1]["response_range"]["kvs"][0]);
                old_id = INODE_NO_POOL(kv.value["id"].uint64_value());
                old_pool_id = (pool_id_t)kv.value["pool_id"].uint64_value();
                idx_mod_rev = kv.mod_revision;
@@ -393,7 +393,7 @@ resume_2:
                    json11::Json::object {
                        { "request_range", json11::Json::object {
                            { "key", base64_encode(
-                                parent->cli->st_cli.etcd_prefix+"/config/inode/"+
+                                parent->cli->st_cli->etcd_prefix+"/config/inode/"+
                                std::to_string(old_pool_id)+"/"+std::to_string(old_id)
                            ) },
                        } },
@@ -411,7 +411,7 @@ resume_3:
                return;
            }
            {
-                auto kv = parent->cli->st_cli.parse_etcd_kv(parent->etcd_result["responses"][0]["response_range"]["kvs"][0]);
+                auto kv = parent->cli->st_cli->parse_etcd_kv(parent->etcd_result["responses"][0]["response_range"]["kvs"][0]);
                size = kv.value["size"].uint64_value();
                new_parent_id = kv.value["parent_id"].uint64_value();
                uint64_t parent_pool_id = kv.value["parent_pool"].uint64_value();
@@ -439,7 +439,7 @@ resume_3:
                { "target", "VERSION" },
                { "version", 0 },
                { "key", base64_encode(
-                    parent->cli->st_cli.etcd_prefix+"/config/inode/"+
+                    parent->cli->st_cli->etcd_prefix+"/config/inode/"+
                    std::to_string(new_pool_id)+"/"+std::to_string(new_id)
                ) },
            },
@@ -447,31 +447,31 @@ resume_3:
                { "target", "VERSION" },
                { "version", 0 },
                { "key", base64_encode(
-                    parent->cli->st_cli.etcd_prefix+"/index/image/"+image_name+
+                    parent->cli->st_cli->etcd_prefix+"/index/image/"+image_name+
                    (new_snap != "" ? "@"+new_snap : "")
                ) },
            },
            json11::Json::object {
                { "target", "MOD" },
                { "mod_revision", max_id_mod_rev },
-                { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/index/maxid/"+std::to_string(new_pool_id)) },
+                { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/index/maxid/"+std::to_string(new_pool_id)) },
            },
        };
        json11::Json::array success = json11::Json::array {
            json11::Json::object {
                { "request_put", json11::Json::object {
                    { "key", base64_encode(
-                        parent->cli->st_cli.etcd_prefix+"/config/inode/"+
+                        parent->cli->st_cli->etcd_prefix+"/config/inode/"+
                        std::to_string(new_pool_id)+"/"+std::to_string(new_id)
                    ) },
                    { "value", base64_encode(
-                        json11::Json(parent->cli->st_cli.serialize_inode_cfg(&new_cfg)).dump()
+                        json11::Json(parent->cli->st_cli->serialize_inode_cfg(&new_cfg)).dump()
                    ) },
                } },
            },
            json11::Json::object {
                { "request_put", json11::Json::object {
-                    { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/index/image/"+image_name) },
+                    { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/index/image/"+image_name) },
                    { "value", base64_encode(json11::Json(json11::Json::object{
                        { "id", new_id },
                        { "pool_id", (uint64_t)new_pool_id },
@@ -481,7 +481,7 @@ resume_3:
            json11::Json::object {
                { "request_put", json11::Json::object {
                    { "key", base64_encode(
-                        parent->cli->st_cli.etcd_prefix+"/index/maxid/"+
+                        parent->cli->st_cli->etcd_prefix+"/index/maxid/"+
                        std::to_string(new_pool_id)
                    ) },
                    { "value", base64_encode(std::to_string(new_id)) }
@@ -492,7 +492,7 @@ resume_3:
            json11::Json::object {
                { "request_range", json11::Json::object {
                    { "key", base64_encode(
-                        parent->cli->st_cli.etcd_prefix+"/index/image/"+
+                        parent->cli->st_cli->etcd_prefix+"/index/image/"+
                        image_name+(new_snap != "" ? "@"+new_snap : "")
                    ) },
                } },
@@ -511,29 +511,29 @@ resume_3:
                { "target", "MOD" },
                { "mod_revision", cfg_mod_rev },
                { "key", base64_encode(
-                    parent->cli->st_cli.etcd_prefix+"/config/inode/"+
+                    parent->cli->st_cli->etcd_prefix+"/config/inode/"+
                    std::to_string(old_pool_id)+"/"+std::to_string(old_id)
                ) },
            });
            checks.push_back(json11::Json::object {
                { "target", "MOD" },
                { "mod_revision", idx_mod_rev },
-                { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/index/image/"+image_name) }
+                { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/index/image/"+image_name) }
            });
            success.push_back(json11::Json::object {
                { "request_put", json11::Json::object {
                    { "key", base64_encode(
-                        parent->cli->st_cli.etcd_prefix+"/config/inode/"+
+                        parent->cli->st_cli->etcd_prefix+"/config/inode/"+
                        std::to_string(old_pool_id)+"/"+std::to_string(old_id)
                    ) },
                    { "value", base64_encode(
-                        json11::Json(parent->cli->st_cli.serialize_inode_cfg(&snap_cfg)).dump()
+                        json11::Json(parent->cli->st_cli->serialize_inode_cfg(&snap_cfg)).dump()
                    ) },
                } },
            });
            success.push_back(json11::Json::object {
                { "request_put", json11::Json::object {
-                    { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/index/image/"+image_name+"@"+new_snap) },
+                    { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/index/image/"+image_name+"@"+new_snap) },
                    { "value", base64_encode(json11::Json(json11::Json::object{
                        { "id", old_id },
                        { "pool_id", (uint64_t)old_pool_id },
@@ -52,19 +52,19 @@ struct dd_in_info_t
        in_seekable = true;
        if (iimg != "")
        {
-            iwatch = parent->cli->st_cli.watch_inode(iimg);
+            iwatch = parent->cli->st_cli->watch_inode(iimg);
            if (!iwatch->cfg.num)
            {
                result = (cli_result_t){ .err = ENOENT, .text = "Image "+iimg+" does not exist" };
-                parent->cli->st_cli.close_watch(iwatch);
+                parent->cli->st_cli->close_watch(iwatch);
                iwatch = NULL;
                return;
            }
-            auto pool_it = parent->cli->st_cli.pool_config.find(INODE_POOL(iwatch->cfg.num));
-            if (pool_it == parent->cli->st_cli.pool_config.end())
+            auto pool_it = parent->cli->st_cli->pool_config.find(INODE_POOL(iwatch->cfg.num));
+            if (pool_it == parent->cli->st_cli->pool_config.end())
            {
                result = (cli_result_t){ .err = ENOENT, .text = "Pool of image "+iimg+" does not exist" };
-                parent->cli->st_cli.close_watch(iwatch);
+                parent->cli->st_cli->close_watch(iwatch);
                iwatch = NULL;
                return;
            }
@@ -131,7 +131,7 @@ struct dd_in_info_t
    {
        if (iimg != "")
        {
-            parent->cli->st_cli.close_watch(iwatch);
+            parent->cli->st_cli->close_watch(iwatch);
            iwatch = NULL;
        }
        else if (ifile != "")
@@ -163,11 +163,11 @@ struct dd_out_info_t

    pool_config_t *find_pool(cli_tool_t *parent, const std::string & name)
    {
-        if (name == "" && parent->cli->st_cli.pool_config.size() == 1)
+        if (name == "" && parent->cli->st_cli->pool_config.size() == 1)
        {
-            return &parent->cli->st_cli.pool_config.begin()->second;
+            return &parent->cli->st_cli->pool_config.begin()->second;
        }
-        for (auto & pp: parent->cli->st_cli.pool_config)
+        for (auto & pp: parent->cli->st_cli->pool_config)
        {
            if (pp.second.name == name)
            {
@@ -186,14 +186,14 @@ struct dd_out_info_t
        if (oimg != "")
        {
            out_seekable = true;
-            owatch = parent->cli->st_cli.watch_inode(oimg);
+            owatch = parent->cli->st_cli->watch_inode(oimg);
            if (owatch->cfg.num)
            {
-                auto pool_it = parent->cli->st_cli.pool_config.find(INODE_POOL(owatch->cfg.num));
-                if (pool_it == parent->cli->st_cli.pool_config.end())
+                auto pool_it = parent->cli->st_cli->pool_config.find(INODE_POOL(owatch->cfg.num));
+                if (pool_it == parent->cli->st_cli->pool_config.end())
                {
                    result = (cli_result_t){ .err = ENOENT, .text = "Pool of image "+oimg+" does not exist" };
-                    parent->cli->st_cli.close_watch(owatch);
+                    parent->cli->st_cli->close_watch(owatch);
                    owatch = NULL;
                    return true;
                }
@@ -209,7 +209,7 @@ struct dd_out_info_t
                else
                {
                    result = (cli_result_t){ .err = ENOENT, .text = "Pool to create output image "+oimg+" is not specified" };
-                    parent->cli->st_cli.close_watch(owatch);
+                    parent->cli->st_cli->close_watch(owatch);
                    owatch = NULL;
                    return true;
                }
@@ -224,14 +224,14 @@ struct dd_out_info_t
                if (!out_create)
                {
                    result = (cli_result_t){ .err = ENOENT, .text = "Image "+oimg+" does not exist" };
-                    parent->cli->st_cli.close_watch(owatch);
+                    parent->cli->st_cli->close_watch(owatch);
                    owatch = NULL;
                    return true;
                }
                if (!out_size)
                {
                    result = (cli_result_t){ .err = ENOENT, .text = "Input size is unknown, specify size to create output image "+oimg };
-                    parent->cli->st_cli.close_watch(owatch);
+                    parent->cli->st_cli->close_watch(owatch);
                    owatch = NULL;
                    return true;
                }
@@ -247,7 +247,7 @@ struct dd_out_info_t
                if (!out_size)
                {
                    result = (cli_result_t){ .err = ENOENT, .text = "Input size is unknown, specify size to truncate output image" };
-                    parent->cli->st_cli.close_watch(owatch);
+                    parent->cli->st_cli->close_watch(owatch);
                    owatch = NULL;
                    return true;
                }
@@ -275,7 +275,7 @@ resume_1:
            sub_cb = NULL;
            if (result.err)
            {
-                parent->cli->st_cli.close_watch(owatch);
+                parent->cli->st_cli->close_watch(owatch);
                owatch = NULL;
                return true;
            }
@@ -324,8 +324,14 @@ resume_2:
                cluster_op_t *sync_op = new cluster_op_t;
                sync_op->opcode = OSD_OP_SYNC;
                parent->waiting++;
-                sync_op->callback = [parent](cluster_op_t *sync_op)
+                sync_op->callback = [this, parent](cluster_op_t *sync_op)
                {
+                    if (sync_op->retval != 0 && !result.err)
+                    {
+                        // Just in case, actually OP_SYNC can't fail
+                        result.err = -sync_op->retval;
+                        result.text = "Failed to sync "+oimg+": "+std::string(strerror(result.err));
+                    }
                    parent->waiting--;
                    delete sync_op;
                    parent->ringloop->wakeup();
@@ -354,7 +360,7 @@ resume_2:
    {
        if (oimg != "")
        {
-            parent->cli->st_cli.close_watch(owatch);
+            parent->cli->st_cli->close_watch(owatch);
            owatch = NULL;
        }
        else
@@ -60,7 +60,7 @@ struct cli_describe_t
        only_pool = cfg["pool"].uint64_value();
        if (!only_pool && cfg["pool"].is_string())
        {
-            for (auto & pp: parent->cli->st_cli.pool_config)
+            for (auto & pp: parent->cli->st_cli->pool_config)
            {
                if (pp.second.name == cfg["pool"].string_value())
                {
@@ -125,7 +125,7 @@ struct cli_describe_t
        {
            uint64_t min_pool = min_inode >> (64-POOL_ID_BITS);
            uint64_t max_pool = max_inode >> (64-POOL_ID_BITS);
-            for (auto & pp: parent->cli->st_cli.pool_config)
+            for (auto & pp: parent->cli->st_cli->pool_config)
            {
                if (pp.first >= min_pool && (!max_pool || pp.first <= max_pool))
                {
@@ -134,8 +134,8 @@ struct cli_fix_t
                return;
            }
            auto & obj = objects[processed_count++];
-            auto pool_cfg_it = parent->cli->st_cli.pool_config.find(INODE_POOL(obj.inode));
-            if (pool_cfg_it == parent->cli->st_cli.pool_config.end())
+            auto pool_cfg_it = parent->cli->st_cli->pool_config.find(INODE_POOL(obj.inode));
+            if (pool_cfg_it == parent->cli->st_cli->pool_config.end())
            {
                fprintf(stderr, "Object %jx:%jx is from unknown pool\n", obj.inode, obj.stripe);
                continue;
@@ -41,8 +41,8 @@ struct snap_flattener_t
        chain_list.push_back(cur->num);
        while (cur->parent_id != 0 && cur->parent_id != target_cfg->num)
        {
-            auto it = parent->cli->st_cli.inode_config.find(cur->parent_id);
-            if (it == parent->cli->st_cli.inode_config.end())
+            auto it = parent->cli->st_cli->inode_config.find(cur->parent_id);
+            if (it == parent->cli->st_cli->inode_config.end())
            {
                result = (cli_result_t){
                    .err = ENOENT,
@@ -97,9 +97,9 @@ struct snap_flattener_t
            { "from", top_parent_name },
            { "to", target_name },
            { "target", target_name },
-            { "delete-source", false },
+            { "delete_source", false },
            { "cas", use_cas },
-            { "fsync-interval", fsync_interval },
+            { "fsync_interval", fsync_interval },
        });
        // Wait for it
 resume_1:
@@ -37,7 +37,7 @@ struct image_lister_t
    {
        if (list_pool_name != "")
        {
-            for (auto & ic: parent->cli->st_cli.pool_config)
+            for (auto & ic: parent->cli->st_cli->pool_config)
            {
                if (ic.second.name == list_pool_name)
                {
@@ -52,14 +52,14 @@ struct image_lister_t
                return;
            }
        }
-        for (auto & ic: parent->cli->st_cli.inode_config)
+        for (auto & ic: parent->cli->st_cli->inode_config)
        {
            if (list_pool_id && INODE_POOL(ic.second.num) != list_pool_id)
            {
                continue;
            }
-            auto pool_it = parent->cli->st_cli.pool_config.find(INODE_POOL(ic.second.num));
-            bool good_pool = pool_it != parent->cli->st_cli.pool_config.end();
+            auto pool_it = parent->cli->st_cli->pool_config.find(INODE_POOL(ic.second.num));
+            bool good_pool = pool_it != parent->cli->st_cli->pool_config.end();
            auto item = json11::Json::object {
                { "name", ic.second.name },
                { "size", ic.second.size },
@@ -73,8 +73,8 @@ struct image_lister_t
            };
            if (ic.second.parent_id)
            {
-                auto p_it = parent->cli->st_cli.inode_config.find(ic.second.parent_id);
-                item["parent_name"] = p_it != parent->cli->st_cli.inode_config.end()
+                auto p_it = parent->cli->st_cli->inode_config.find(ic.second.parent_id);
+                item["parent_name"] = p_it != parent->cli->st_cli->inode_config.end()
                    ? p_it->second.name : "";
                item["parent_pool_id"] = (uint64_t)INODE_POOL(ic.second.parent_id);
                item["parent_inode_num"] = INODE_NO_POOL(ic.second.parent_id);
@@ -96,21 +96,21 @@ struct image_lister_t
                json11::Json::object {
                    { "request_range", (list_pool_id
                        ? json11::Json::object {
-                            { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/pool/stats/"+std::to_string(list_pool_id)) },
+                            { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/pool/stats/"+std::to_string(list_pool_id)) },
                        }
                        : json11::Json::object {
-                            { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/pool/stats/") },
-                            { "range_end", base64_encode(parent->cli->st_cli.etcd_prefix+"/pool/stats0") },
+                            { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/pool/stats/") },
+                            { "range_end", base64_encode(parent->cli->st_cli->etcd_prefix+"/pool/stats0") },
                        }) },
                },
                json11::Json::object {
                    { "request_range", json11::Json::object {
                        { "key", base64_encode(
-                            parent->cli->st_cli.etcd_prefix+"/inode/stats"+
+                            parent->cli->st_cli->etcd_prefix+"/inode/stats"+
                            (list_pool_id ? "/"+std::to_string(list_pool_id) : "")+"/"
                        ) },
                        { "range_end", base64_encode(
-                            parent->cli->st_cli.etcd_prefix+"/inode/stats"+
+                            parent->cli->st_cli->etcd_prefix+"/inode/stats"+
                            (list_pool_id ? "/"+std::to_string(list_pool_id) : "")+"0"
                        ) },
                    } },
@@ -131,11 +131,11 @@ resume_1:
        std::map<pool_id_t, uint64_t> pool_pg_real_size;
        for (auto & kv_item: space_info["responses"][0]["response_range"]["kvs"].array_items())
        {
-            auto kv = parent->cli->st_cli.parse_etcd_kv(kv_item);
+            auto kv = parent->cli->st_cli->parse_etcd_kv(kv_item);
            // pool ID
            pool_id_t pool_id;
            char null_byte = 0;
-            int scanned = sscanf(kv.key.substr(parent->cli->st_cli.etcd_prefix.length()).c_str(), "/pool/stats/%u%c", &pool_id, &null_byte);
+            int scanned = sscanf(kv.key.substr(parent->cli->st_cli->etcd_prefix.length()).c_str(), "/pool/stats/%u%c", &pool_id, &null_byte);
            if (scanned != 1 || !pool_id || pool_id >= POOL_ID_MAX)
            {
                fprintf(stderr, "Invalid key in etcd: %s\n", kv.key.c_str());
@@ -146,12 +146,12 @@ resume_1:
        }
        for (auto & kv_item: space_info["responses"][1]["response_range"]["kvs"].array_items())
        {
-            auto kv = parent->cli->st_cli.parse_etcd_kv(kv_item);
+            auto kv = parent->cli->st_cli->parse_etcd_kv(kv_item);
            // pool ID & inode number
            pool_id_t pool_id;
            inode_t only_inode_num;
            char null_byte = 0;
-            int scanned = sscanf(kv.key.substr(parent->cli->st_cli.etcd_prefix.length()).c_str(),
+            int scanned = sscanf(kv.key.substr(parent->cli->st_cli->etcd_prefix.length()).c_str(),
                "/inode/stats/%u/%ju%c", &pool_id, &only_inode_num, &null_byte);
            if (scanned != 2 || !pool_id || pool_id >= POOL_ID_MAX || INODE_POOL(only_inode_num) != 0)
            {
@@ -161,8 +161,8 @@ resume_1:
            inode_t inode_num = INODE_WITH_POOL(pool_id, only_inode_num);
            uint64_t used_size = kv.value["raw_used"].uint64_value();
            // save stats
-            auto pool_it = parent->cli->st_cli.pool_config.find(pool_id);
-            if (pool_it != parent->cli->st_cli.pool_config.end())
+            auto pool_it = parent->cli->st_cli->pool_config.find(pool_id);
+            if (pool_it != parent->cli->st_cli->pool_config.end())
            {
                auto & pool_cfg = pool_it->second;
                used_size = used_size / (pool_pg_real_size[pool_id] ? pool_pg_real_size[pool_id] : 1)
@@ -176,7 +176,7 @@ resume_1:
                    { "size", 0 },
                    { "readonly", false },
                    { "pool_id", (uint64_t)INODE_POOL(inode_num) },
-                    { "pool_name", pool_it != parent->cli->st_cli.pool_config.end()
+                    { "pool_name", pool_it != parent->cli->st_cli->pool_config.end()
                        ? (pool_it->second.name == "" ? "<Unnamed>" : pool_it->second.name) : "?" },
                    { "inode_num", INODE_NO_POOL(inode_num) },
                    { "inode_id", inode_num },
@@ -110,8 +110,8 @@ struct snap_merger_t
            cur->parent_id != to_cfg->num &&
            cur->parent_id != 0)
        {
-            auto it = parent->cli->st_cli.inode_config.find(cur->parent_id);
-            if (it == parent->cli->st_cli.inode_config.end())
+            auto it = parent->cli->st_cli->inode_config.find(cur->parent_id);
+            if (it == parent->cli->st_cli->inode_config.end())
            {
                result = (cli_result_t){
                    .err = ENOENT,
@@ -166,7 +166,7 @@ struct snap_merger_t
        //
        //    <from> - <layer 1> - <target> - <to>
        //          \- <layer 2> <---------X-------- NOT ALLOWED
-        for (auto & ic: parent->cli->st_cli.inode_config)
+        for (auto & ic: parent->cli->st_cli->inode_config)
        {
            auto it = sources.find(ic.second.num);
            if (it == sources.end() && ic.second.parent_id != 0)
@@ -182,7 +182,7 @@ struct snap_merger_t
                            .text = "Layers at or above "+(check_delete_source ? from_name : target_name)+
                                ", but below "+to_name+" are not allowed to have other children, but "+
                                ic.second.name+" is a child of "+
-                                parent->cli->st_cli.inode_config.at(ic.second.parent_id).name,
+                                parent->cli->st_cli->inode_config.at(ic.second.parent_id).name,
                        };
                        state = 100;
                        return;
@@ -213,7 +213,7 @@ struct snap_merger_t

    uint64_t get_block_size(inode_t inode, uint32_t *bitmap_granularity)
    {
-        auto & pool_cfg = parent->cli->st_cli.pool_config.at(INODE_POOL(inode));
+        auto & pool_cfg = parent->cli->st_cli->pool_config.at(INODE_POOL(inode));
        uint64_t pg_data_size = (pool_cfg.scheme == POOL_SCHEME_REPLICATED ? 1 : pool_cfg.pg_size-pool_cfg.parity_chunks);
        if (bitmap_granularity)
            *bitmap_granularity = pool_cfg.bitmap_granularity;
@@ -251,6 +251,8 @@ struct snap_merger_t
            goto resume_100;
        // Get parents and so on
        start_merge();
+        if (state == 100)
+            return;
        // First list lower layers
        list_errcode.clear();
        list_layers(true);
@@ -418,7 +420,7 @@ struct snap_merger_t
                    }
                    if (!pgs_left)
                    {
-                        auto & name = parent->cli->st_cli.inode_config.at(src).name;
+                        auto & name = parent->cli->st_cli->inode_config.at(src).name;
                        if (list_errcode.find(src) != list_errcode.end())
                        {
                            fprintf(stderr, "Failed to get listing of layer %s (inode %ju in pool %u): %s (code %d)\n",
@@ -612,8 +614,10 @@ struct snap_merger_t
        subop->offset = offset;
        subop->len = 0;
        subop->flags = OSD_OP_IGNORE_READONLY | OSD_OP_WAIT_UP_TIMEOUT;
-        subop->callback = [](cluster_op_t *subop)
+        in_flight++;
+        subop->callback = [this](cluster_op_t *subop)
        {
+            in_flight--;
            if (subop->retval != 0)
            {
                fprintf(stderr, "error deleting from layer 0x%jx at offset %jx: %s", subop->inode, subop->offset, strerror(-subop->retval));
@@ -640,8 +644,10 @@ struct snap_merger_t
                    uint64_t to = last_written_offset;
                    cluster_op_t *subop = new cluster_op_t;
                    subop->opcode = OSD_OP_SYNC;
+                    in_flight++;
                    subop->callback = [this, to](cluster_op_t *subop)
                    {
+                        in_flight--;
                        delete subop;
                        // We can now delete source data between <from> and <to>
                        // But to do this we have to keep all object lists in memory :-(
@@ -53,7 +53,7 @@ struct image_changer_t
            state = 100;
            return;
        }
-        for (auto & ic: parent->cli->st_cli.inode_config)
+        for (auto & ic: parent->cli->st_cli->inode_config)
        {
            if (ic.second.name == image_name)
            {
@@ -74,7 +74,7 @@ struct image_changer_t
            state = 100;
            return;
        }
-        for (auto & ic: parent->cli->st_cli.inode_config)
+        for (auto & ic: parent->cli->st_cli->inode_config)
        {
            if (ic.second.parent_id == inode_num)
            {
@@ -110,9 +110,9 @@ struct image_changer_t
                cb = parent->start_rm_data(json11::Json::object {
                    { "inode", INODE_NO_POOL(inode_num) },
                    { "pool", (uint64_t)INODE_POOL(inode_num) },
-                    { "fsync-interval", fsync_interval },
-                    { "min-offset", ((new_size+4095)/4096)*4096 },
-                    { "down-ok", down_ok },
+                    { "fsync_interval", fsync_interval },
+                    { "min_offset", ((new_size+4095)/4096)*4096 },
+                    { "down_ok", down_ok },
                });
 resume_1:
                while (!cb(result))
@@ -153,7 +153,7 @@ resume_1:
            cfg.name = new_name;
        }
        {
-            std::string cur_cfg_key = base64_encode(parent->cli->st_cli.etcd_prefix+
+            std::string cur_cfg_key = base64_encode(parent->cli->st_cli->etcd_prefix+
                "/config/inode/"+std::to_string(INODE_POOL(inode_num))+
                "/"+std::to_string(INODE_NO_POOL(inode_num)));
            checks.push_back(json11::Json::object {
@@ -166,7 +166,7 @@ resume_1:
                { "request_put", json11::Json::object {
                    { "key", cur_cfg_key },
                    { "value", base64_encode(json11::Json(
-                        parent->cli->st_cli.serialize_inode_cfg(&cfg)
+                        parent->cli->st_cli->serialize_inode_cfg(&cfg)
                    ).dump()) },
                } }
            });
@@ -174,10 +174,10 @@ resume_1:
        if (new_name != "")
        {
            std::string old_idx_key = base64_encode(
-                parent->cli->st_cli.etcd_prefix+"/index/image/"+image_name
+                parent->cli->st_cli->etcd_prefix+"/index/image/"+image_name
            );
            std::string new_idx_key = base64_encode(
-                parent->cli->st_cli.etcd_prefix+"/index/image/"+new_name
+                parent->cli->st_cli->etcd_prefix+"/index/image/"+new_name
            );
            checks.push_back(json11::Json::object {
                { "target", "MOD" },
@@ -229,9 +229,9 @@ resume_2:
        cfg.mod_revision = parent->etcd_result["header"]["revision"].uint64_value();
        if (new_name != "")
        {
-            parent->cli->st_cli.inode_by_name.erase(image_name);
+            parent->cli->st_cli->inode_by_name.erase(image_name);
        }
-        parent->cli->st_cli.insert_inode_config(cfg);
+        parent->cli->st_cli->insert_inode_config(cfg);
        result = (cli_result_t){
            .err = 0,
            .text = "Image "+image_name+" modified",
@@ -68,12 +68,12 @@ struct osd_changer_t
            { "success", json11::Json::array {
                json11::Json::object {
                    { "request_range", json11::Json::object {
-                        { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/osd/stats/"+std::to_string(osd_num)) },
+                        { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/osd/stats/"+std::to_string(osd_num)) },
                    } },
                },
                json11::Json::object {
                    { "request_range", json11::Json::object {
-                        { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/config/osd/"+std::to_string(osd_num)) },
+                        { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/config/osd/"+std::to_string(osd_num)) },
                    } },
                },
            } },
@@ -89,14 +89,14 @@ resume_1:
            return;
        }
        {
-            auto osd_stats = parent->cli->st_cli.parse_etcd_kv(parent->etcd_result["responses"][0]["response_range"]["kvs"][0]).value;
+            auto osd_stats = parent->cli->st_cli->parse_etcd_kv(parent->etcd_result["responses"][0]["response_range"]["kvs"][0]).value;
            if (!osd_stats.is_object() && !force)
            {
                result = (cli_result_t){ .err = ENOENT, .text = "OSD "+std::to_string(osd_num)+" does not exist. Use --force to set configuration anyway" };
                state = 100;
                return;
            }
-            auto kv = parent->cli->st_cli.parse_etcd_kv(parent->etcd_result["responses"][1]["response_range"]["kvs"][0]);
+            auto kv = parent->cli->st_cli->parse_etcd_kv(parent->etcd_result["responses"][1]["response_range"]["kvs"][0]);
            osd_cfg_mod_rev = kv.mod_revision;
            osd_cfg = kv.value.object_items();
            if (set_reweight)
@@ -124,7 +124,7 @@ resume_1:
            {
                compare.push_back(json11::Json::object {
                    { "target", "MOD" },
-                    { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/config/osd/"+std::to_string(osd_num)) },
+                    { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/config/osd/"+std::to_string(osd_num)) },
                    { "result", "LESS" },
                    { "mod_revision", osd_cfg_mod_rev+1 },
                });
@@ -133,7 +133,7 @@ resume_1:
            {
                compare.push_back(json11::Json::object {
                    { "target", "VERSION" },
-                    { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/config/osd/"+std::to_string(osd_num)) },
+                    { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/config/osd/"+std::to_string(osd_num)) },
                    { "version", 0 },
                });
            }
@@ -141,7 +141,7 @@ resume_1:
            {
                success.push_back(json11::Json::object {
                    { "request_delete_range", json11::Json::object {
-                        { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/config/osd/"+std::to_string(osd_num)) },
+                        { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/config/osd/"+std::to_string(osd_num)) },
                    } },
                });
            }
@@ -149,7 +149,7 @@ resume_1:
            {
                success.push_back(json11::Json::object {
                    { "request_put", json11::Json::object {
-                        { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/config/osd/"+std::to_string(osd_num)) },
+                        { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/config/osd/"+std::to_string(osd_num)) },
                        { "value", base64_encode(json11::Json(osd_cfg).dump()) },
                    } },
                });
@@ -62,19 +62,19 @@ struct osd_tree_printer_t
            { "success", json11::Json::array {
                json11::Json::object {
                    { "request_range", json11::Json::object {
-                        { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/config/node_placement") },
+                        { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/config/node_placement") },
                    } },
                },
                json11::Json::object {
                    { "request_range", json11::Json::object {
-                        { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/config/osd/") },
-                        { "range_end", base64_encode(parent->cli->st_cli.etcd_prefix+"/config/osd0") },
+                        { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/config/osd/") },
+                        { "range_end", base64_encode(parent->cli->st_cli->etcd_prefix+"/config/osd0") },
                    } },
                },
                json11::Json::object {
                    { "request_range", json11::Json::object {
-                        { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/osd/stats/") },
-                        { "range_end", base64_encode(parent->cli->st_cli.etcd_prefix+"/osd/stats0") },
+                        { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/osd/stats/") },
+                        { "range_end", base64_encode(parent->cli->st_cli->etcd_prefix+"/osd/stats0") },
                    } },
                },
            } },
@@ -91,7 +91,7 @@ resume_1:
        }
        for (auto & item: parent->etcd_result["responses"][0]["response_range"]["kvs"].array_items())
        {
-            node_placement = parent->cli->st_cli.parse_etcd_kv(item).value;
+            node_placement = parent->cli->st_cli->parse_etcd_kv(item).value;
        }
        parent->iterate_kvs_1(parent->etcd_result["responses"][1]["response_range"]["kvs"], "/config/osd/", [&](uint64_t cur_osd, json11::Json value)
        {
@@ -132,7 +132,7 @@ resume_1:
                .parent = kv.second["host"].string_value(),
                .size = kv.second["size"].uint64_value(),
                .free = kv.second["free"].uint64_value(),
-                .up = parent->cli->st_cli.peer_states.find(kv.first) != parent->cli->st_cli.peer_states.end(),
+                .up = parent->cli->st_cli->peer_states.find(kv.first) != parent->cli->st_cli->peer_states.end(),
                .reweight = 1,
                .noout = false,
                .block_size = (uint32_t)kv.second["data_block_size"].uint64_value(),
@@ -32,7 +32,7 @@ struct pg_lister_t
        if (pool_name != "")
        {
            pool_id = 0;
-            for (auto & pp: parent->cli->st_cli.pool_config)
+            for (auto & pp: parent->cli->st_cli->pool_config)
            {
                if (pp.second.name == pool_name)
                {
@@ -51,8 +51,8 @@ struct pg_lister_t
            { "success", json11::Json::array {
                json11::Json::object {
                    { "request_range", json11::Json::object {
-                        { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/pgstats"+(pool_id ? "/"+std::to_string(pool_id)+"/" : "/")) },
-                        { "range_end", base64_encode(parent->cli->st_cli.etcd_prefix+"/pgstats"+(pool_id ? "/"+std::to_string(pool_id)+"0" : "0")) },
+                        { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/pgstats"+(pool_id ? "/"+std::to_string(pool_id)+"/" : "/")) },
+                        { "range_end", base64_encode(parent->cli->st_cli->etcd_prefix+"/pgstats"+(pool_id ? "/"+std::to_string(pool_id)+"0" : "0")) },
                    } },
                },
            } },
@@ -129,7 +129,7 @@ resume_1:
            }
        }
        json11::Json::array pgs;
-        for (auto & pp: parent->cli->st_cli.pool_config)
+        for (auto & pp: parent->cli->st_cli->pool_config)
        {
            if ((!pool_id || pp.first == pool_id) && (pool_name == "" || pp.second.name == pool_name))
            {
@@ -60,8 +60,8 @@ struct pool_creator_t
        // Validate pool parameters
        {
            auto new_cfg = cfg.object_items();
-            result.text = validate_pool_config(new_cfg, json11::Json(), parent->cli->st_cli.global_block_size,
-                parent->cli->st_cli.global_bitmap_granularity, force);
+            result.text = validate_pool_config(new_cfg, json11::Json(), parent->cli->st_cli->global_block_size,
+                parent->cli->st_cli->global_bitmap_granularity, force);
            cfg = new_cfg;
        }
        if (result.text != "")
@@ -72,7 +72,7 @@ struct pool_creator_t
        }

        // Validate pool name
-        for (auto & pp: parent->cli->st_cli.pool_config)
+        for (auto & pp: parent->cli->st_cli->pool_config)
        {
            if (pp.second.name == cfg["name"].string_value())
            {
@@ -95,13 +95,13 @@ resume_1:
                { "success", json11::Json::array {
                    json11::Json::object {
                        { "request_range", json11::Json::object {
-                            { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/config/node_placement") },
+                            { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/config/node_placement") },
                        } },
                    },
                    json11::Json::object {
                        { "request_range", json11::Json::object {
-                            { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/osd/stats/") },
-                            { "range_end", base64_encode(parent->cli->st_cli.etcd_prefix+"/osd/stats0") },
+                            { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/osd/stats/") },
+                            { "range_end", base64_encode(parent->cli->st_cli->etcd_prefix+"/osd/stats0") },
                        } },
                    },
                } },
@@ -120,7 +120,7 @@ resume_2:

            // Get state_node_tree based on node_placement and osd stats
            {
-                auto node_placement_kv = parent->cli->st_cli.parse_etcd_kv(parent->etcd_result["responses"][0]["response_range"]["kvs"][0]);
+                auto node_placement_kv = parent->cli->st_cli->parse_etcd_kv(parent->etcd_result["responses"][0]["response_range"]["kvs"][0]);
                timespec tv_now;
                clock_gettime(CLOCK_REALTIME, &tv_now);
                uint64_t osd_out_time = parent->cli->config["osd_out_time"].uint64_value();
@@ -145,7 +145,7 @@ resume_2:
                    {
                        osd_configs.push_back(json11::Json::object {
                            { "request_range", json11::Json::object {
-                                { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/config/osd/"+osd_num.as_string()) },
+                                { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/config/osd/"+osd_num.as_string()) },
                            } }
                        });
                    }
@@ -168,7 +168,7 @@ resume_3:
                    std::vector<json11::Json> osd_configs;
                    for (auto & ocr: parent->etcd_result["responses"].array_items())
                    {
-                        auto kv = parent->cli->st_cli.parse_etcd_kv(ocr["response_range"]["kvs"][0]);
+                        auto kv = parent->cli->st_cli->parse_etcd_kv(ocr["response_range"]["kvs"][0]);
                        osd_configs.push_back(kv.value);
                    }
                    state_node_tree = filter_state_node_tree_by_tags(state_node_tree, osd_configs);
@@ -229,7 +229,7 @@ resume_5:
            { "success", json11::Json::array {
                json11::Json::object {
                    { "request_range", json11::Json::object {
-                        { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/config/pools") },
+                        { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/config/pools") },
                    } }
                },
            } },
@@ -246,7 +246,7 @@ resume_6:
        }
        {
            // Add new pool
-            auto kv = parent->cli->st_cli.parse_etcd_kv(parent->etcd_result["responses"][0]["response_range"]["kvs"][0]);
+            auto kv = parent->cli->st_cli->parse_etcd_kv(parent->etcd_result["responses"][0]["response_range"]["kvs"][0]);
            new_pools = create_pool(kv);
            if (new_pools.is_string())
            {
@@ -261,7 +261,7 @@ resume_6:
            { "compare", json11::Json::array {
                json11::Json::object {
                    { "target", "MOD" },
-                    { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/config/pools") },
+                    { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/config/pools") },
                    { "result", "LESS" },
                    { "mod_revision", new_pools_mod_rev+1 },
                }
@@ -269,7 +269,7 @@ resume_6:
            { "success", json11::Json::array {
                json11::Json::object {
                    { "request_put", json11::Json::object {
-                        { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/config/pools") },
+                        { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/config/pools") },
                        { "value", base64_encode(new_pools.dump()) },
                    } },
                },
@@ -307,9 +307,9 @@ resume_8:
            parent->waiting++;
            parent->epmgr->tfd->set_timer(create_check.interval, false, [this](int timer_id)
            {
-                if (parent->cli->st_cli.pool_config.find(new_id) != parent->cli->st_cli.pool_config.end())
+                if (parent->cli->st_cli->pool_config.find(new_id) != parent->cli->st_cli->pool_config.end())
                {
-                    auto & pool_cfg = parent->cli->st_cli.pool_config[new_id];
+                    auto & pool_cfg = parent->cli->st_cli->pool_config[new_id];
                    create_check.passed = pool_cfg.real_pg_count > 0;
                    for (auto pg_it = pool_cfg.pg_config.begin(); pg_it != pool_cfg.pg_config.end(); pg_it++)
                    {
@@ -459,7 +459,7 @@ resume_8:
                        osd_bs = UINT32_MAX;
                }
            }
-            if (osd_bs && osd_bs != UINT32_MAX && osd_bs != parent->cli->st_cli.global_block_size)
+            if (osd_bs && osd_bs != UINT32_MAX && osd_bs != parent->cli->st_cli->global_block_size)
            {
                fprintf(stderr, "Auto-selecting block_size=%s because all pool OSDs use it\n", format_size(osd_bs, false, true).c_str());
                upd["block_size"] = osd_bs;
@@ -478,7 +478,7 @@ resume_8:
                        osd_bg = UINT32_MAX;
                }
            }
-            if (osd_bg && osd_bg != UINT32_MAX && osd_bg != parent->cli->st_cli.global_bitmap_granularity)
+            if (osd_bg && osd_bg != UINT32_MAX && osd_bg != parent->cli->st_cli->global_bitmap_granularity)
            {
                fprintf(stderr, "Auto-selecting bitmap_granularity=%s because all pool OSDs use it\n", format_size(osd_bg, false, true).c_str());
                upd["bitmap_granularity"] = osd_bg;
@@ -498,7 +498,7 @@ resume_8:
                        osd_imm = UINT32_MAX-1;
                }
            }
-            if (osd_imm < UINT32_MAX-1 && osd_imm != parent->cli->st_cli.global_immediate_commit)
+            if (osd_imm < UINT32_MAX-1 && osd_imm != parent->cli->st_cli->global_immediate_commit)
            {
                const char *imm_str = osd_imm == IMMEDIATE_NONE ? "none" : (osd_imm == IMMEDIATE_ALL ? "all" : "small");
                fprintf(stderr, "Auto-selecting immediate_commit=%s because all pool OSDs use it\n", imm_str);
@@ -530,13 +530,13 @@ resume_8:

        block_size = cfg["block_size"].uint64_value()
            ? cfg["block_size"].uint64_value()
-            : parent->cli->st_cli.global_block_size;
+            : parent->cli->st_cli->global_block_size;
        bitmap_granularity = cfg["bitmap_granularity"].uint64_value()
            ? cfg["bitmap_granularity"].uint64_value()
-            : parent->cli->st_cli.global_bitmap_granularity;
+            : parent->cli->st_cli->global_bitmap_granularity;
        immediate_commit = cfg["immediate_commit"].is_string()
            ? etcd_state_client_t::parse_immediate_commit(cfg["immediate_commit"].string_value(), IMMEDIATE_ALL)
-            : parent->cli->st_cli.global_immediate_commit;
+            : parent->cli->st_cli->global_immediate_commit;

        for (auto osd_num_json: state_node_tree["osds"].array_items())
        {
@@ -63,37 +63,37 @@ struct pool_lister_t
                json11::Json::object {
                    { "request_range", json11::Json::object {
                        { "key", base64_encode(
-                            parent->cli->st_cli.etcd_prefix+"/pool/stats/"
+                            parent->cli->st_cli->etcd_prefix+"/pool/stats/"
                        ) },
                        { "range_end", base64_encode(
-                            parent->cli->st_cli.etcd_prefix+"/pool/stats0"
+                            parent->cli->st_cli->etcd_prefix+"/pool/stats0"
                        ) },
                    } },
                },
                json11::Json::object {
                    { "request_range", json11::Json::object {
                        { "key", base64_encode(
-                            parent->cli->st_cli.etcd_prefix+"/osd/stats/"
+                            parent->cli->st_cli->etcd_prefix+"/osd/stats/"
                        ) },
                        { "range_end", base64_encode(
-                            parent->cli->st_cli.etcd_prefix+"/osd/stats0"
+                            parent->cli->st_cli->etcd_prefix+"/osd/stats0"
                        ) },
                    } },
                },
                json11::Json::object {
                    { "request_range", json11::Json::object {
                        { "key", base64_encode(
-                            parent->cli->st_cli.etcd_prefix+"/config/pools"
+                            parent->cli->st_cli->etcd_prefix+"/config/pools"
                        ) },
                    } },
                },
                json11::Json::object {
                    { "request_range", json11::Json::object {
                        { "key", base64_encode(
-                            parent->cli->st_cli.etcd_prefix+"/config/osd/"
+                            parent->cli->st_cli->etcd_prefix+"/config/osd/"
                        ) },
                        { "range_end", base64_encode(
-                            parent->cli->st_cli.etcd_prefix+"/config/osd0"
+                            parent->cli->st_cli->etcd_prefix+"/config/osd0"
                        ) },
                    } },
                },
@@ -113,7 +113,7 @@ resume_1:
        auto config_pools = space_info["responses"][2]["response_range"]["kvs"][0];
        if (!config_pools.is_null())
        {
-            config_pools = parent->cli->st_cli.parse_etcd_kv(config_pools).value;
+            config_pools = parent->cli->st_cli->parse_etcd_kv(config_pools).value;
        }
        parent->iterate_kvs_1(space_info["responses"][0]["response_range"]["kvs"], "/pool/stats/", [&](uint64_t pool_id, json11::Json value)
        {
@@ -134,7 +134,7 @@ resume_1:
            }
        });
        // Calculate max_avail for each pool
-        for (auto & pp: parent->cli->st_cli.pool_config)
+        for (auto & pp: parent->cli->st_cli->pool_config)
        {
            auto & pool_cfg = pp.second;
            uint64_t pool_avail = UINT64_MAX;
@@ -238,10 +238,10 @@ resume_1:
                json11::Json::object {
                    { "request_range", json11::Json::object {
                        { "key", base64_encode(
-                            parent->cli->st_cli.etcd_prefix+"/pgstats/"
+                            parent->cli->st_cli->etcd_prefix+"/pgstats/"
                        ) },
                        { "range_end", base64_encode(
-                            parent->cli->st_cli.etcd_prefix+"/pgstats0"
+                            parent->cli->st_cli->etcd_prefix+"/pgstats0"
                        ) },
                    } },
                },
@@ -289,10 +289,10 @@ resume_1:
                json11::Json::object {
                    { "request_range", json11::Json::object {
                        { "key", base64_encode(
-                            parent->cli->st_cli.etcd_prefix+"/inode/stats/"
+                            parent->cli->st_cli->etcd_prefix+"/inode/stats/"
                        ) },
                        { "range_end", base64_encode(
-                            parent->cli->st_cli.etcd_prefix+"/inode/stats0"
+                            parent->cli->st_cli->etcd_prefix+"/inode/stats0"
                        ) },
                    } },
                },
@@ -478,7 +478,7 @@ resume_3:
                auto total = st["object_count"].uint64_value();
                auto obj_size = st["block_size"].uint64_value();
                if (!obj_size)
-                    obj_size = parent->cli->st_cli.global_block_size;
+                    obj_size = parent->cli->st_cli->global_block_size;
                if (st["scheme"] == "ec")
                    obj_size *= st["pg_size"].uint64_value() - st["parity_chunks"].uint64_value();
                else if (st["scheme"] == "xor")
@@ -56,7 +56,7 @@ resume_0:
            { "success", json11::Json::array {
                json11::Json::object {
                    { "request_range", json11::Json::object {
-                        { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/config/pools") },
+                        { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/config/pools") },
                    } }
                },
            } },
@@ -73,7 +73,7 @@ resume_1:
        }
        {
            // Parse received pools from etcd
-            auto kv = parent->cli->st_cli.parse_etcd_kv(parent->etcd_result["responses"][0]["response_range"]["kvs"][0]);
+            auto kv = parent->cli->st_cli->parse_etcd_kv(parent->etcd_result["responses"][0]["response_range"]["kvs"][0]);

            // Get pool by name or ID
            old_cfg = json11::Json();
@@ -103,8 +103,8 @@ resume_1:

            // Update pool
            new_cfg = cfg;
-            result.text = validate_pool_config(new_cfg, old_cfg, parent->cli->st_cli.global_block_size,
-                parent->cli->st_cli.global_bitmap_granularity, force);
+            result.text = validate_pool_config(new_cfg, old_cfg, parent->cli->st_cli->global_block_size,
+                parent->cli->st_cli->global_bitmap_granularity, force);
            if (result.text != "")
            {
                result.err = EINVAL;
@@ -115,8 +115,8 @@ resume_1:
            if (new_cfg.find("used_for_app") != new_cfg.end() && !force)
            {
                // Check that pool doesn't have images
-                auto img_it = parent->cli->st_cli.inode_config.lower_bound(INODE_WITH_POOL(pool_id, 0));
-                if (img_it != parent->cli->st_cli.inode_config.end() &&
+                auto img_it = parent->cli->st_cli->inode_config.lower_bound(INODE_WITH_POOL(pool_id, 0));
+                if (img_it != parent->cli->st_cli->inode_config.end() &&
                    INODE_POOL(img_it->first) == pool_id &&
                    new_cfg["used_for_app"].string_value().substr(0, 3) == "fs:" &&
                    img_it->second.name == new_cfg["used_for_app"].string_value().substr(3))
@@ -124,7 +124,7 @@ resume_1:
                    // Only allow metadata image to exist in the FS pool
                    img_it++;
                }
-                if (img_it != parent->cli->st_cli.inode_config.end() && INODE_POOL(img_it->first) == pool_id)
+                if (img_it != parent->cli->st_cli->inode_config.end() && INODE_POOL(img_it->first) == pool_id)
                {
                    result = (cli_result_t){ .err = ENOENT, .text = "Pool "+pool_name+" has block images, delete them before using it for VitastorFS, S3 or another app" };
                    state = 100;
@@ -145,7 +145,7 @@ resume_1:
            { "compare", json11::Json::array {
                json11::Json::object {
                    { "target", "MOD" },
-                    { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/config/pools") },
+                    { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/config/pools") },
                    { "result", "LESS" },
                    { "mod_revision", pools_mod_rev+1 },
                }
@@ -153,7 +153,7 @@ resume_1:
            { "success", json11::Json::array {
                json11::Json::object {
                    { "request_put", json11::Json::object {
-                        { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/config/pools") },
+                        { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/config/pools") },
                        { "value", base64_encode(new_pools.dump()) },
                    } },
                },
@@ -56,7 +56,7 @@ struct pool_remover_t
        // Get pool id by name (if name given)
        if (pool_name != "")
        {
-            for (auto & ic: parent->cli->st_cli.pool_config)
+            for (auto & ic: parent->cli->st_cli->pool_config)
            {
                if (ic.second.name == pool_name)
                {
@@ -73,7 +73,7 @@ struct pool_remover_t
            pool_name = "id " + std::to_string(pool_id);

            // Look-up pool id in pool_config
-            if (parent->cli->st_cli.pool_config.find(pool_id) != parent->cli->st_cli.pool_config.end())
+            if (parent->cli->st_cli->pool_config.find(pool_id) != parent->cli->st_cli->pool_config.end())
            {
                pool_valid = 1;
            }
@@ -92,7 +92,7 @@ struct pool_remover_t
        {
            std::string images;

-            for (auto & ic: parent->cli->st_cli.inode_config)
+            for (auto & ic: parent->cli->st_cli->inode_config)
            {
                if (pool_id && INODE_POOL(ic.second.num) != pool_id)
                {
@@ -124,7 +124,7 @@ resume_1:
                { "success", json11::Json::array {
                    json11::Json::object {
                        { "request_range", json11::Json::object {
-                            { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/config/pools") },
+                            { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/config/pools") },
                        } }
                    },
                } },
@@ -141,7 +141,7 @@ resume_2:
            }
            {
                // Parse received pools from etcd
-                auto kv = parent->cli->st_cli.parse_etcd_kv(parent->etcd_result["responses"][0]["response_range"]["kvs"][0]);
+                auto kv = parent->cli->st_cli->parse_etcd_kv(parent->etcd_result["responses"][0]["response_range"]["kvs"][0]);

                // Remove pool
                auto p = kv.value.object_items();
@@ -166,7 +166,7 @@ resume_2:
                { "compare", json11::Json::array {
                    json11::Json::object {
                        { "target", "MOD" },
-                        { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/config/pools") },
+                        { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/config/pools") },
                        { "result", "LESS" },
                        { "mod_revision", pools_mod_rev+1 },
                    }
@@ -174,7 +174,7 @@ resume_2:
                { "success", json11::Json::array {
                    json11::Json::object {
                        { "request_put", json11::Json::object {
-                            { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/config/pools") },
+                            { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/config/pools") },
                            { "value", base64_encode(new_pools.dump()) },
                        } },
                    },
@@ -82,8 +82,8 @@ struct cli_raw_ls_t
        }
        if (!pg_count || !pg_stripe_size || !osds.size())
        {
-            auto pool_it = parent->cli->st_cli.pool_config.find(pool_id);
-            if (pool_it == parent->cli->st_cli.pool_config.end())
+            auto pool_it = parent->cli->st_cli->pool_config.find(pool_id);
+            if (pool_it == parent->cli->st_cli->pool_config.end())
            {
                result = (cli_result_t){ .err = EINVAL, .text = "pg_count, pg_stripe_size and osds are required if the pool does not exist" };
                state = 100;
@@ -127,7 +127,7 @@ struct cli_raw_ls_t
        for (; osd_pos < osd_list.size() && parent->waiting < parent->parallel_osds; osd_pos++)
        {
            uint64_t osd_num = osd_list[osd_pos];
-            if (parent->cli->st_cli.peer_states[osd_num].is_null())
+            if (parent->cli->st_cli->peer_states[osd_num].is_null())
            {
                fprintf(stderr, "OSD %ju is unavailable, skipping\n", osd_num);
                continue;
@@ -129,7 +129,7 @@ resume_1:
        {
            if (merge_children[current_child] == inverse_child)
                continue;
-            rebased_images.push_back(parent->cli->st_cli.inode_config.at(merge_children[current_child]).name);
+            rebased_images.push_back(parent->cli->st_cli->inode_config.at(merge_children[current_child]).name);
            start_merge_child(merge_children[current_child], merge_children[current_child]);
 resume_2:
            while (!wait_result(2))
@@ -176,8 +176,8 @@ resume_6:
            if (chain_list[current_child] == inverse_parent)
                continue;
            {
-                auto parent_it = parent->cli->st_cli.inode_config.find(chain_list[current_child]);
-                if (parent_it != parent->cli->st_cli.inode_config.end())
+                auto parent_it = parent->cli->st_cli->inode_config.find(chain_list[current_child]);
+                if (parent_it != parent->cli->st_cli->inode_config.end())
                    deleted_images.push_back(parent_it->second.name);
                deleted_ids.push_back(chain_list[current_child]);
            }
@@ -264,8 +264,8 @@ resume_100:
        chain_list.push_back(cur->num);
        while (cur->num != from_cfg->num && cur->parent_id != 0)
        {
-            auto it = parent->cli->st_cli.inode_config.find(cur->parent_id);
-            if (it == parent->cli->st_cli.inode_config.end())
+            auto it = parent->cli->st_cli->inode_config.find(cur->parent_id);
+            if (it == parent->cli->st_cli->inode_config.end())
            {
                char buf[1024];
                snprintf(buf, 1024, "Parent inode of layer %s (id 0x%jx) not found", cur->name.c_str(), cur->parent_id);
@@ -288,7 +288,7 @@ resume_100:
        {
            sources[item] = i--;
        }
-        for (auto & ic: parent->cli->st_cli.inode_config)
+        for (auto & ic: parent->cli->st_cli->inode_config)
        {
            if (!ic.second.parent_id)
            {
@@ -319,7 +319,7 @@ resume_100:
            reads.push_back(json11::Json::object {
                { "request_range", json11::Json::object {
                    { "key", base64_encode(
-                        parent->cli->st_cli.etcd_prefix+
+                        parent->cli->st_cli->etcd_prefix+
                        "/inode/stats/"+std::to_string(INODE_POOL(inode))+
                        "/"+std::to_string(INODE_NO_POOL(inode))
                    ) },
@@ -332,7 +332,7 @@ resume_100:
            reads.push_back(json11::Json::object {
                { "request_range", json11::Json::object {
                    { "key", base64_encode(
-                        parent->cli->st_cli.etcd_prefix+
+                        parent->cli->st_cli->etcd_prefix+
                        "/inode/stats/"+std::to_string(INODE_POOL(inode))+
                        "/"+std::to_string(INODE_NO_POOL(inode))
                    ) },
@@ -340,7 +340,7 @@ resume_100:
            });
        }
        parent->waiting++;
-        parent->cli->st_cli.etcd_txn_slow(json11::Json::object {
+        parent->cli->st_cli->etcd_txn_slow(json11::Json::object {
            { "success", reads },
        }, [this](std::string err, json11::Json data)
        {
@@ -357,19 +357,19 @@ resume_100:
                {
                    continue;
                }
-                auto kv = parent->cli->st_cli.parse_etcd_kv(inode_result["response_range"]["kvs"][0]);
+                auto kv = parent->cli->st_cli->parse_etcd_kv(inode_result["response_range"]["kvs"][0]);
                pool_id_t pool_id = 0;
                inode_t inode = 0;
                char null_byte = 0;
-                int scanned = sscanf(kv.key.c_str() + parent->cli->st_cli.etcd_prefix.length()+13, "%u/%ju%c", &pool_id, &inode, &null_byte);
+                int scanned = sscanf(kv.key.c_str() + parent->cli->st_cli->etcd_prefix.length()+13, "%u/%ju%c", &pool_id, &inode, &null_byte);
                if (scanned != 2 || !inode)
                {
                    result = (cli_result_t){ .err = EIO, .text = "Bad key returned from etcd: "+kv.key };
                    state = 100;
                    return;
                }
-                auto pool_cfg_it = parent->cli->st_cli.pool_config.find(pool_id);
-                if (pool_cfg_it == parent->cli->st_cli.pool_config.end())
+                auto pool_cfg_it = parent->cli->st_cli->pool_config.find(pool_id);
+                if (pool_cfg_it == parent->cli->st_cli->pool_config.end())
                {
                    result = (cli_result_t){ .err = ENOENT, .text = "Pool "+std::to_string(pool_id)+" does not exist" };
                    state = 100;
@@ -412,8 +412,8 @@ resume_100:

    void rename_inverse_parent()
    {
-        auto child_it = parent->cli->st_cli.inode_config.find(inverse_child);
-        if (child_it == parent->cli->st_cli.inode_config.end())
+        auto child_it = parent->cli->st_cli->inode_config.find(inverse_child);
+        if (child_it == parent->cli->st_cli->inode_config.end())
        {
            char buf[1024];
            snprintf(buf, 1024, "Inode 0x%jx disappeared", inverse_child);
@@ -421,8 +421,8 @@ resume_100:
            state = 100;
            return;
        }
-        auto target_it = parent->cli->st_cli.inode_config.find(inverse_parent);
-        if (target_it == parent->cli->st_cli.inode_config.end())
+        auto target_it = parent->cli->st_cli->inode_config.find(inverse_parent);
+        if (target_it == parent->cli->st_cli->inode_config.end())
        {
            char buf[1024];
            snprintf(buf, 1024, "Inode 0x%jx disappeared", inverse_parent);
@@ -435,17 +435,17 @@ resume_100:
        inverse_child_name = child_cfg->name;
        inverse_parent_name = target_cfg->name;
        std::string child_cfg_key = base64_encode(
-            parent->cli->st_cli.etcd_prefix+
+            parent->cli->st_cli->etcd_prefix+
            "/config/inode/"+std::to_string(INODE_POOL(inverse_child))+
            "/"+std::to_string(INODE_NO_POOL(inverse_child))
        );
        std::string target_cfg_key = base64_encode(
-            parent->cli->st_cli.etcd_prefix+
+            parent->cli->st_cli->etcd_prefix+
            "/config/inode/"+std::to_string(INODE_POOL(inverse_parent))+
            "/"+std::to_string(INODE_NO_POOL(inverse_parent))
        );
        std::string target_idx_key = base64_encode(
-            parent->cli->st_cli.etcd_prefix+"/index/image/"+inverse_parent_name
+            parent->cli->st_cli->etcd_prefix+"/index/image/"+inverse_parent_name
        );
        // Fill new configuration
        inode_config_t new_cfg = *child_cfg;
@@ -480,12 +480,12 @@ resume_100:
            json11::Json::object {
                { "request_put", json11::Json::object {
                    { "key", target_cfg_key },
-                    { "value", base64_encode(json11::Json(parent->cli->st_cli.serialize_inode_cfg(&new_cfg)).dump()) },
+                    { "value", base64_encode(json11::Json(parent->cli->st_cli->serialize_inode_cfg(&new_cfg)).dump()) },
                } },
            },
            json11::Json::object {
                { "request_put", json11::Json::object {
-                    { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/index/image/"+child_cfg->name) },
+                    { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/index/image/"+child_cfg->name) },
                    { "value", base64_encode(json11::Json({
                        { "id", INODE_NO_POOL(inverse_parent) },
                        { "pool_id", (uint64_t)INODE_POOL(inverse_parent) },
@@ -494,14 +494,14 @@ resume_100:
            },
        };
        // Reparent children of inverse_child
-        for (auto & cp: parent->cli->st_cli.inode_config)
+        for (auto & cp: parent->cli->st_cli->inode_config)
        {
            if (cp.second.parent_id == child_cfg->num)
            {
                auto cp_cfg = cp.second;
                cp_cfg.parent_id = inverse_parent;
                auto cp_key = base64_encode(
-                    parent->cli->st_cli.etcd_prefix+
+                    parent->cli->st_cli->etcd_prefix+
                    "/config/inode/"+std::to_string(INODE_POOL(cp.second.num))+
                    "/"+std::to_string(INODE_NO_POOL(cp.second.num))
                );
@@ -514,13 +514,13 @@ resume_100:
                txn.push_back(json11::Json::object {
                    { "request_put", json11::Json::object {
                        { "key", cp_key },
-                        { "value", base64_encode(json11::Json(parent->cli->st_cli.serialize_inode_cfg(&cp_cfg)).dump()) },
+                        { "value", base64_encode(json11::Json(parent->cli->st_cli->serialize_inode_cfg(&cp_cfg)).dump()) },
                    } },
                });
            }
        }
        parent->waiting++;
-        parent->cli->st_cli.etcd_txn_slow(json11::Json::object {
+        parent->cli->st_cli->etcd_txn_slow(json11::Json::object {
            { "compare", cmp },
            { "success", txn },
        }, [this](std::string err, json11::Json res)
@@ -550,8 +550,8 @@ resume_100:

    void delete_inode_config(inode_t cur)
    {
-        auto cur_cfg_it = parent->cli->st_cli.inode_config.find(cur);
-        if (cur_cfg_it == parent->cli->st_cli.inode_config.end())
+        auto cur_cfg_it = parent->cli->st_cli->inode_config.find(cur);
+        if (cur_cfg_it == parent->cli->st_cli->inode_config.end())
        {
            char buf[1024];
            snprintf(buf, 1024, "Inode 0x%jx disappeared", cur);
@@ -562,12 +562,12 @@ resume_100:
        inode_config_t *cur_cfg = &cur_cfg_it->second;
        std::string cur_name = cur_cfg->name;
        std::string cur_cfg_key = base64_encode(
-            parent->cli->st_cli.etcd_prefix+
+            parent->cli->st_cli->etcd_prefix+
            "/config/inode/"+std::to_string(INODE_POOL(cur))+
            "/"+std::to_string(INODE_NO_POOL(cur))
        );
        parent->waiting++;
-        parent->cli->st_cli.etcd_txn_slow(json11::Json::object {
+        parent->cli->st_cli->etcd_txn_slow(json11::Json::object {
            { "compare", json11::Json::array {
                json11::Json::object {
                    { "target", "MOD" },
@@ -584,7 +584,7 @@ resume_100:
                },
                json11::Json::object {
                    { "request_delete_range", json11::Json::object {
-                        { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/index/image/"+cur_name) },
+                        { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/index/image/"+cur_name) },
                    } },
                },
            } },
@@ -604,8 +604,8 @@ resume_100:
                return;
            }
            // Modify inode_config for library users to be able to take it from there immediately
-            parent->cli->st_cli.inode_by_name.erase(cur_name);
-            parent->cli->st_cli.inode_config.erase(cur);
+            parent->cli->st_cli->inode_by_name.erase(cur_name);
+            parent->cli->st_cli->inode_config.erase(cur);
            if (parent->progress)
                printf("Layer %s deleted\n", cur_name.c_str());
            parent->ringloop->wakeup();
@@ -614,8 +614,8 @@ resume_100:

    void start_merge_child(inode_t child_inode, inode_t target_inode)
    {
-        auto child_it = parent->cli->st_cli.inode_config.find(child_inode);
-        if (child_it == parent->cli->st_cli.inode_config.end())
+        auto child_it = parent->cli->st_cli->inode_config.find(child_inode);
+        if (child_it == parent->cli->st_cli->inode_config.end())
        {
            char buf[1024];
            snprintf(buf, 1024, "Inode 0x%jx disappeared", child_inode);
@@ -623,8 +623,8 @@ resume_100:
            state = 100;
            return;
        }
-        auto target_it = parent->cli->st_cli.inode_config.find(target_inode);
-        if (target_it == parent->cli->st_cli.inode_config.end())
+        auto target_it = parent->cli->st_cli->inode_config.find(target_inode);
+        if (target_it == parent->cli->st_cli->inode_config.end())
        {
            char buf[1024];
            snprintf(buf, 1024, "Inode 0x%jx disappeared", target_inode);
@@ -636,16 +636,16 @@ resume_100:
            { "from", from_name },
            { "to", child_it->second.name },
            { "target", target_it->second.name },
-            { "delete-source", false },
+            { "delete_source", false },
            { "cas", use_cas },
-            { "fsync-interval", fsync_interval },
+            { "fsync_interval", fsync_interval },
        });
    }

    void start_mark_deleted(inode_t inode)
    {
-        auto ino_it = parent->cli->st_cli.inode_config.find(inode);
-        if (ino_it == parent->cli->st_cli.inode_config.end())
+        auto ino_it = parent->cli->st_cli->inode_config.find(inode);
+        if (ino_it == parent->cli->st_cli->inode_config.end())
        {
            char buf[1024];
            snprintf(buf, 1024, "Inode 0x%jx disappeared", inode);
@@ -665,8 +665,8 @@ resume_100:

    void start_delete_source(inode_t inode)
    {
-        auto source = parent->cli->st_cli.inode_config.find(inode);
-        if (source == parent->cli->st_cli.inode_config.end())
+        auto source = parent->cli->st_cli->inode_config.find(inode);
+        if (source == parent->cli->st_cli->inode_config.end())
        {
            char buf[1024];
            snprintf(buf, 1024, "Inode 0x%jx disappeared", inode);
@@ -677,8 +677,8 @@ resume_100:
        cb = parent->start_rm_data(json11::Json::object {
            { "inode", inode },
            { "pool", (uint64_t)INODE_POOL(inode) },
-            { "fsync-interval", fsync_interval },
-            { "down-ok", down_ok },
+            { "fsync_interval", fsync_interval },
+            { "down_ok", down_ok },
        });
    }
 };
@@ -44,8 +44,8 @@ struct rm_inode_t

    void start_delete()
    {
-        auto pool_it = parent->cli->st_cli.pool_config.find(pool_id);
-        if (pool_it == parent->cli->st_cli.pool_config.end())
+        auto pool_it = parent->cli->st_cli->pool_config.find(pool_id);
+        if (pool_it == parent->cli->st_cli->pool_config.end())
        {
            result = (cli_result_t){ .err = EINVAL, .text = "Pool does not exist" };
            state = 100;
@@ -61,12 +61,11 @@ struct rm_inode_t
            }
            else
            {
-                rm_pg_t *rm = new rm_pg_t((rm_pg_t){
-                    .pg_num = pg_num,
-                    .objects = std::move(objects),
-                    .obj_done = 0,
-                    .synced = !objects.size() || parent->cli->get_immediate_commit(inode),
-                });
+                rm_pg_t *rm = new rm_pg_t();
+                rm->pg_num = pg_num;
+                rm->objects = std::move(objects);
+                rm->obj_done = 0;
+                rm->synced = !rm->objects.size() || parent->cli->get_immediate_commit(inode);
                if (min_offset == 0 && max_offset == 0)
                {
                    total_count += rm->objects.size();
@@ -196,8 +195,8 @@ struct rm_inode_t
            {
                fprintf(stderr, "Warning: some OSDs don't indicate left_on_dead PG OSDs"
                    " in delete replies, falling back to simpler checks\n");
-                auto pool_it = parent->cli->st_cli.pool_config.find(pool_id);
-                if (pool_it != parent->cli->st_cli.pool_config.end())
+                auto pool_it = parent->cli->st_cli->pool_config.find(pool_id);
+                if (pool_it != parent->cli->st_cli->pool_config.end())
                {
                    std::set<osd_num_t> all_peers;
                    for (auto pg_num: fallback_pgs)
@@ -217,7 +216,7 @@ struct rm_inode_t
                    all_peers.erase(0);
                    for (auto peer_osd: all_peers)
                    {
-                        if (parent->cli->st_cli.peer_states[peer_osd].is_null())
+                        if (parent->cli->st_cli->peer_states[peer_osd].is_null())
                            inactive_osds.insert(peer_osd);
                    }
                }
@@ -68,14 +68,14 @@ struct rm_osd_t
        // Check if OSDs are still up
        for (auto osd_id: to_remove)
        {
-            if (parent->cli->st_cli.peer_states.find(osd_id) != parent->cli->st_cli.peer_states.end())
+            if (parent->cli->st_cli->peer_states.find(osd_id) != parent->cli->st_cli->peer_states.end())
            {
                is_warning = !allow_up;
                still_up.push_back(osd_id);
            }
        }
        // Check if OSDs are still used in data distribution
-        for (auto & pp: parent->cli->st_cli.pool_config)
+        for (auto & pp: parent->cli->st_cli->pool_config)
        {
            // Will OSD deletion make pool incomplete / down / degraded?
            bool pool_incomplete = false, pool_down = false, pool_degraded = false;
@@ -189,14 +189,14 @@ struct rm_osd_t
            json11::Json::object {
                { "request_range", json11::Json::object {
                    { "key", base64_encode(
-                        parent->cli->st_cli.etcd_prefix+"/pg/config"
+                        parent->cli->st_cli->etcd_prefix+"/pg/config"
                    ) },
                } },
            },
            json11::Json::object {
                { "request_range", json11::Json::object {
                    { "key", base64_encode(
-                        parent->cli->st_cli.etcd_prefix+"/history/last_clean_pgs"
+                        parent->cli->st_cli->etcd_prefix+"/history/last_clean_pgs"
                    ) },
                } },
            },
@@ -212,10 +212,10 @@ struct rm_osd_t
            return;
        }
        {
-            auto kv = parent->cli->st_cli.parse_etcd_kv(parent->etcd_result["responses"][0]["response_range"]["kvs"][0]);
+            auto kv = parent->cli->st_cli->parse_etcd_kv(parent->etcd_result["responses"][0]["response_range"]["kvs"][0]);
            new_pgs = remove_osds_from_pgs(kv);
            new_pgs_mod_rev = kv.mod_revision;
-            kv = parent->cli->st_cli.parse_etcd_kv(parent->etcd_result["responses"][1]["response_range"]["kvs"][0]);
+            kv = parent->cli->st_cli->parse_etcd_kv(parent->etcd_result["responses"][1]["response_range"]["kvs"][0]);
            new_clean_pgs = remove_osds_from_pgs(kv);
            new_clean_pgs_mod_rev = kv.mod_revision;
        }
@@ -235,14 +235,14 @@ struct rm_osd_t
                rm_items[i] = json11::Json::object {
                    { "request_delete_range", json11::Json::object {
                        { "key", base64_encode(
-                            parent->cli->st_cli.etcd_prefix+rm_items[i].string_value()
+                            parent->cli->st_cli->etcd_prefix+rm_items[i].string_value()
                        ) },
                    } },
                };
            }
            if (!new_pgs.is_null())
            {
-                auto pgs_key = base64_encode(parent->cli->st_cli.etcd_prefix+"/pg/config");
+                auto pgs_key = base64_encode(parent->cli->st_cli->etcd_prefix+"/pg/config");
                rm_items.push_back(json11::Json::object {
                    { "request_put", json11::Json::object {
                        { "key", pgs_key },
@@ -258,7 +258,7 @@ struct rm_osd_t
            }
            if (!new_clean_pgs.is_null())
            {
-                auto pgs_key = base64_encode(parent->cli->st_cli.etcd_prefix+"/history/last_clean_pgs");
+                auto pgs_key = base64_encode(parent->cli->st_cli->etcd_prefix+"/history/last_clean_pgs");
                rm_items.push_back(json11::Json::object {
                    { "request_put", json11::Json::object {
                        { "key", pgs_key },
@@ -375,7 +375,7 @@ struct rm_osd_t
            goto resume_0;
        history_updates.clear();
        history_checks.clear();
-        for (auto & pp: parent->cli->st_cli.pool_config)
+        for (auto & pp: parent->cli->st_cli->pool_config)
        {
            bool update_pg_history = false;
            auto & pool_cfg = pp.second;
@@ -420,7 +420,7 @@ struct rm_osd_t
                if (update_pg_history)
                {
                    std::string history_key = base64_encode(
-                        parent->cli->st_cli.etcd_prefix+"/pg/history/"+
+                        parent->cli->st_cli->etcd_prefix+"/pg/history/"+
                        std::to_string(pool_cfg.id)+"/"+std::to_string(pg_num)
                    );
                    auto hist = json11::Json::object {
@@ -440,7 +440,7 @@ struct rm_osd_t
                        { "target", "MOD" },
                        { "key", history_key },
                        { "result", "LESS" },
-                        { "mod_revision", parent->cli->st_cli.etcd_watch_revision_pg+1 },
+                        { "mod_revision", parent->cli->st_cli->etcd_watch_revision_pg+1 },
                    });
                }
            }
@@ -48,7 +48,7 @@ struct wildcard_remover_t
            {
                auto child_id = ino_it->first;
                auto parent_id = ino_it->second;
-                auto & parent_cfg = parent->cli->st_cli.inode_config.at(parent_id);
+                auto & parent_cfg = parent->cli->st_cli->inode_config.at(parent_id);
                if (parent_cfg.parent_id)
                {
                    auto chain_it = chains.find(parent_cfg.parent_id);
@@ -71,7 +71,7 @@ struct wildcard_remover_t
            std::vector<inode_rev_t> ver_chain;
            do
            {
-                auto & inode_cfg = parent->cli->st_cli.inode_config.at(child_id);
+                auto & inode_cfg = parent->cli->st_cli->inode_config.at(child_id);
                ver_chain.push_back((inode_rev_t){ .inode_num = child_id, .meta_rev = inode_cfg.mod_revision });
                if (child_id == parent_id)
                    break;
@@ -89,7 +89,7 @@ struct wildcard_remover_t
            do
            {
                rank++;
-                cur_id = parent->cli->st_cli.inode_config.at(cur_id).parent_id;
+                cur_id = parent->cli->st_cli->inode_config.at(cur_id).parent_id;
            } while (cur_id && cur_id != parent_id);
            ranks[parent_id] = rank;
        }
@@ -111,7 +111,7 @@ struct wildcard_remover_t
        state = 0;
        chains.clear();
        // Select images to delete
-        for (auto & ic: parent->cli->st_cli.inode_config)
+        for (auto & ic: parent->cli->st_cli->inode_config)
        {
            for (auto & glob: globs)
            {
@@ -131,11 +131,11 @@ struct wildcard_remover_t
            // Check for parallel changes
            for (auto & irev: versioned_chains[i])
            {
-                auto inode_it = parent->cli->st_cli.inode_config.find(irev.inode_num);
-                if (inode_it == parent->cli->st_cli.inode_config.end() ||
+                auto inode_it = parent->cli->st_cli->inode_config.find(irev.inode_num);
+                if (inode_it == parent->cli->st_cli->inode_config.end() ||
                    inode_it->second.mod_revision > irev.meta_rev)
                {
-                    if (inode_it != parent->cli->st_cli.inode_config.end())
+                    if (inode_it != parent->cli->st_cli->inode_config.end())
                        fprintf(stderr, "Warning: image %s modified by someone else during deletion, restarting wildcard deletion\n", inode_it->second.name.c_str());
                    else
                        fprintf(stderr, "Warning: inode %jx modified by someone else during deletion, retrying wildcard deletion\n", irev.inode_num);
@@ -144,8 +144,8 @@ struct wildcard_remover_t
            }
            // Delete
            {
-                auto from_cfg = parent->cli->st_cli.inode_config.at(versioned_chains[i].back().inode_num);
-                auto to_cfg = parent->cli->st_cli.inode_config.at(versioned_chains[i].front().inode_num);
+                auto from_cfg = parent->cli->st_cli->inode_config.at(versioned_chains[i].back().inode_num);
+                auto to_cfg = parent->cli->st_cli->inode_config.at(versioned_chains[i].front().inode_num);
                sub_cfg = cfg.object_items();
                sub_cfg.erase("globs");
                sub_cfg.erase("exact");
@@ -37,14 +37,14 @@ struct status_printer_t
            goto resume_2;
        // etcd states
        {
-            auto addrs = parent->cli->st_cli.get_addresses();
+            auto addrs = parent->cli->st_cli->get_addresses();
            etcd_states.resize(addrs.size());
            for (int i = 0; i < etcd_states.size(); i++)
            {
                parent->waiting++;
-                parent->cli->st_cli.etcd_call_oneshot(
+                parent->cli->st_cli->etcd_call_oneshot(
                    addrs[i], "/maintenance/status", json11::Json::object(),
-                    parent->cli->st_cli.etcd_quick_timeout, [this, i](std::string err, json11::Json res)
+                    parent->cli->st_cli->etcd_quick_timeout, [this, i](std::string err, json11::Json res)
                    {
                        parent->waiting--;
                        etcd_states[i] = err != "" ? json11::Json::object{ { "error", err } } : res;
@@ -62,23 +62,23 @@ resume_1:
            { "success", json11::Json::array {
                json11::Json::object {
                    { "request_range", json11::Json::object {
-                        { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/mon/") },
-                        { "range_end", base64_encode(parent->cli->st_cli.etcd_prefix+"/mon0") },
+                        { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/mon/") },
+                        { "range_end", base64_encode(parent->cli->st_cli->etcd_prefix+"/mon0") },
                    } },
                },
                json11::Json::object {
                    { "request_range", json11::Json::object {
                        { "key", base64_encode(
-                            parent->cli->st_cli.etcd_prefix+"/osd/stats/"
+                            parent->cli->st_cli->etcd_prefix+"/osd/stats/"
                        ) },
                        { "range_end", base64_encode(
-                            parent->cli->st_cli.etcd_prefix+"/osd/stats0"
+                            parent->cli->st_cli->etcd_prefix+"/osd/stats0"
                        ) },
                    } },
                },
                json11::Json::object {
                    { "request_range", json11::Json::object {
-                        { "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/stats") },
+                        { "key", base64_encode(parent->cli->st_cli->etcd_prefix+"/stats") },
                    } },
                },
            } },
@@ -97,7 +97,7 @@ resume_2:
        auto osd_stats = parent->etcd_result["responses"][1]["response_range"]["kvs"];
        if (parent->etcd_result["responses"][2]["response_range"]["kvs"].array_items().size() > 0)
        {
-            agg_stats = parent->cli->st_cli.parse_etcd_kv(parent->etcd_result["responses"][2]["response_range"]["kvs"][0]).value;
+            agg_stats = parent->cli->st_cli->parse_etcd_kv(parent->etcd_result["responses"][2]["response_range"]["kvs"][0]).value;
        }
        int etcd_alive = 0;
        uint64_t etcd_db_size = 0;
@@ -120,8 +120,8 @@ resume_2:
        std::string mon_master;
        for (int i = 0; i < mon_members.size(); i++)
        {
-            auto kv = parent->cli->st_cli.parse_etcd_kv(mon_members[i]);
-            kv.key = kv.key.substr(parent->cli->st_cli.etcd_prefix.size());
+            auto kv = parent->cli->st_cli->parse_etcd_kv(mon_members[i]);
+            kv.key = kv.key.substr(parent->cli->st_cli->etcd_prefix.size());
            if (kv.key.substr(0, 12) == "/mon/member/")
                mon_count++;
            else if (kv.key == "/mon/master")
@@ -153,8 +153,8 @@ resume_2:
                    osds_nearfull++;
                }
            }
-            auto peer_it = parent->cli->st_cli.peer_states.find(stat_osd_num);
-            if (peer_it != parent->cli->st_cli.peer_states.end())
+            auto peer_it = parent->cli->st_cli->peer_states.find(stat_osd_num);
+            if (peer_it != parent->cli->st_cli->peer_states.end())
            {
                osd_up++;
                if (value["slow_ops_primary"].uint64_value() > 0)
@@ -177,7 +177,7 @@ resume_2:
        std::string backfillfull_pool_names;
        std::map<std::string, int> pgs_by_state;
        std::string pgs_by_state_str;
-        for (auto & pool_pair: parent->cli->st_cli.pool_config)
+        for (auto & pool_pair: parent->cli->st_cli->pool_config)
        {
            auto & pool_cfg = pool_pair.second;
            bool active = pool_cfg.real_pg_count > 0;
@@ -262,7 +262,7 @@ resume_2:
                std::string str(obj_states[i]);
                uint64_t obj_n = agg_stats["object_bytes"][str].uint64_value();
                if (!obj_n)
-                    obj_n = agg_stats["object_counts"][str].uint64_value() * parent->cli->st_cli.global_block_size;
+                    obj_n = agg_stats["object_counts"][str].uint64_value() * parent->cli->st_cli->global_block_size;
                json_status[str+"_data"] = obj_n;
            }
            printf("%s\n", json11::Json(json_status).dump().c_str());
@@ -275,7 +275,7 @@ resume_2:
            std::string str(obj_states[i]);
            uint64_t obj_n = agg_stats["object_bytes"][str].uint64_value();
            if (!obj_n)
-                obj_n = agg_stats["object_counts"][str].uint64_value() * parent->cli->st_cli.global_block_size;
+                obj_n = agg_stats["object_counts"][str].uint64_value() * parent->cli->st_cli->global_block_size;
            if (!i || obj_n > 0)
                more_states += format_size(obj_n)+" "+str+", ";
        }
@@ -317,9 +317,13 @@ int main(int argc, char *argv[])
        else
        {
            // First argument is an OSD device - take metadata layout parameters from it
+            if (self.options["io"] != "")
+                self.dsk.data_io = self.dsk.meta_io = self.dsk.journal_io = self.options["io"];
            if (self.dump_load_check_superblock(self.dsk.journal_device))
                return 1;
        }
+        if (self.options["io"] != "")
+            self.dsk.data_io = self.dsk.meta_io = self.dsk.journal_io = self.options["io"];
        return self.dump_journal();
    }
    else if (!strcmp(cmd[0], "write-journal"))
@@ -340,6 +344,8 @@ int main(int argc, char *argv[])
        else
        {
            // First argument is an OSD device - take metadata layout parameters from it
+            if (self.options["io"] != "")
+                self.dsk.data_io = self.dsk.meta_io = self.dsk.journal_io = self.options["io"];
            if (self.dump_load_check_superblock(self.new_journal_device))
                return 1;
            self.new_journal_device = self.dsk.journal_device;
@@ -366,6 +372,10 @@ int main(int argc, char *argv[])
        {
            self.dsk.csum_block_size = stoull_full(self.options["csum_block_size"], 0);
        }
+        if (self.options["io"] != "")
+        {
+            self.dsk.data_io = self.dsk.meta_io = self.dsk.journal_io = self.options["io"];
+        }
        return self.write_json_journal(entries);
    }
    else if (!strcmp(cmd[0], "dump-meta"))
@@ -382,6 +392,8 @@ int main(int argc, char *argv[])
        {
            // First argument is an OSD device - take metadata layout parameters from it
            self.dsk.meta_device = cmd[1];
+            if (self.options["io"] != "")
+                self.dsk.data_io = self.dsk.meta_io = self.dsk.journal_io = self.options["io"];
            if (self.dump_load_check_superblock(self.dsk.meta_device))
                return 1;
        }
@@ -398,6 +410,8 @@ int main(int argc, char *argv[])
            self.dsk.calc_lengths();
            self.dsk.close_all();
        }
+        if (self.options["io"] != "")
+            self.dsk.data_io = self.dsk.meta_io = self.dsk.journal_io = self.options["io"];
        return self.dump_meta();
    }
    else if (!strcmp(cmd[0], "write-meta"))
@@ -412,6 +426,8 @@ int main(int argc, char *argv[])
        {
            // First argument is an OSD device - take metadata layout parameters from it
            self.new_meta_device = cmd[1];
+            if (self.options["io"] != "")
+                self.dsk.data_io = self.dsk.meta_io = self.dsk.journal_io = self.options["io"];
            if (self.dump_load_check_superblock(self.new_meta_device))
                return 1;
            self.new_meta_device = self.dsk.meta_device;
@@ -422,6 +438,8 @@ int main(int argc, char *argv[])
        {
            // Parse all OSD options from cmdline
            self.dsk.parse_config(self.options);
+            if (self.options["io"] != "")
+                self.dsk.data_io = self.dsk.meta_io = self.dsk.journal_io = self.options["io"];
            self.dsk.open_data();
            self.dsk.open_meta();
            self.dsk.open_journal();
@@ -438,6 +456,8 @@ int main(int argc, char *argv[])
            fprintf(stderr, "Invalid JSON: %s\n", json_err.c_str());
            return 1;
        }
+        if (self.options["io"] != "")
+            self.dsk.data_io = self.dsk.meta_io = self.dsk.journal_io = self.options["io"];
        return self.write_json_meta(meta);
    }
    else if (!strcmp(cmd[0], "resize"))
@@ -477,11 +477,15 @@ int disk_tool_t::write_json_journal(json11::Json entries)
        uint16_t type = t_it->second;
        if (type == JE_START)
            continue;
+        uint32_t offset = (uint32_t)rec["offset"].uint64_value();
+        uint32_t len = (uint32_t)rec["len"].uint64_value();
+        uint32_t data_csum_blocks = !dsk.data_csum_type || !len ? 0 :
+            (((offset + len - 1)/dsk.csum_block_size - offset/dsk.csum_block_size + 1));
+        uint32_t data_csum_size = data_csum_blocks*(dsk.data_csum_type & 0xFF);
        uint32_t entry_size = (type == JE_START
            ? sizeof(journal_entry_start)
            : (type == JE_SMALL_WRITE || type == JE_SMALL_WRITE_INSTANT
-                ? sizeof(journal_entry_small_write) + dsk.clean_entry_bitmap_size +
-                    (dsk.data_csum_type ? rec["len"].uint64_value()/dsk.csum_block_size*(dsk.data_csum_type & 0xFF) : 0)
+                ? sizeof(journal_entry_small_write) + dsk.clean_entry_bitmap_size + data_csum_size
                : (type == JE_BIG_WRITE || type == JE_BIG_WRITE_INSTANT
                    ? sizeof(journal_entry_big_write) + dsk.clean_entry_bitmap_size +
                        (dsk.data_csum_type ? rec["len"].uint64_value()/dsk.csum_block_size*(dsk.data_csum_type & 0xFF) : 0)
@@ -507,7 +511,7 @@ int disk_tool_t::write_json_journal(json11::Json entries)
        journal_entry *ne = (journal_entry*)(new_journal_ptr + new_journal_in_pos);
        if (type == JE_SMALL_WRITE || type == JE_SMALL_WRITE_INSTANT)
        {
-            if (new_journal_data - new_journal_buf + ne->small_write.len > new_journal_len)
+            if (new_journal_data - new_journal_buf + len > new_journal_len)
            {
                fprintf(stderr, "Error: entries don't fit to the new journal\n");
                free(new_journal_buf);
@@ -523,15 +527,12 @@ int disk_tool_t::write_json_journal(json11::Json entries)
                    .stripe = sscanf_json(NULL, rec["stripe"]),
                },
                .version = rec["ver"].uint64_value(),
-                .offset = (uint32_t)rec["offset"].uint64_value(),
-                .len = (uint32_t)rec["len"].uint64_value(),
+                .offset = offset,
+                .len = len,
                .data_offset = (uint64_t)(new_journal_data-new_journal_buf),
                .crc32_data = !dsk.data_csum_type ? 0 : (uint32_t)sscanf_json("%x", rec["data_crc32"]),
            };
-            uint32_t data_csum_blocks = !dsk.data_csum_type ? 0 :
-                (((ne->small_write.offset+ne->small_write.len)/dsk.csum_block_size - ne->small_write.len/dsk.csum_block_size));
-            uint32_t data_csum_size = data_csum_blocks*(dsk.data_csum_type & 0xFF);
-            fromhexstr(rec["bitmap"].string_value(), dsk.clean_entry_bitmap_size, ((uint8_t*)ne) + sizeof(journal_entry_small_write) + data_csum_size);
+            fromhexstr(rec["bitmap"].string_value(), dsk.clean_entry_bitmap_size, ((uint8_t*)ne) + sizeof(journal_entry_small_write));
            fromhexstr(rec["data"].string_value(), ne->small_write.len, new_journal_data);
            if (ne->small_write.len > 0 && !rec["data"].is_string())
            {
@@ -545,7 +546,7 @@ int disk_tool_t::write_json_journal(json11::Json entries)
                    ne->small_write.crc32_data = crc32c(0, new_journal_data, ne->small_write.len);
                else if (dsk.data_csum_type == BLOCKSTORE_CSUM_CRC32C)
                {
-                    uint32_t *block_csums = (uint32_t*)(((uint8_t*)ne) + sizeof(journal_entry_small_write));
+                    uint32_t *block_csums = (uint32_t*)(((uint8_t*)ne) + sizeof(journal_entry_small_write) + dsk.clean_entry_bitmap_size);
                    for (uint32_t i = 0; i < data_csum_blocks; i++)
                    {
                        uint32_t block_begin = (ne->small_write.offset/dsk.csum_block_size + i) * dsk.csum_block_size;
@@ -574,12 +575,9 @@ int disk_tool_t::write_json_journal(json11::Json entries)
                .len = (uint32_t)rec["len"].uint64_value(),
                .location = sscanf_json(NULL, rec["loc"]),
            };
-            uint32_t data_csum_blocks = !dsk.data_csum_type ? 0 :
-                (((ne->small_write.offset+ne->small_write.len)/dsk.csum_block_size - ne->small_write.len/dsk.csum_block_size));
-            uint32_t data_csum_size = data_csum_blocks*(dsk.data_csum_type & 0xFF);
-            fromhexstr(rec["bitmap"].string_value(), dsk.clean_entry_bitmap_size, ((uint8_t*)ne) + sizeof(journal_entry_big_write) + data_csum_size);
+            fromhexstr(rec["bitmap"].string_value(), dsk.clean_entry_bitmap_size, ((uint8_t*)ne) + sizeof(journal_entry_big_write));
            if (dsk.data_csum_type)
-                fromhexstr(rec["block_csums"].string_value(), data_csum_size, ((uint8_t*)ne) + sizeof(journal_entry_big_write));
+                fromhexstr(rec["block_csums"].string_value(), data_csum_size, ((uint8_t*)ne) + sizeof(journal_entry_big_write) + dsk.clean_entry_bitmap_size);
        }
        else if (type == JE_STABLE || type == JE_ROLLBACK || type == JE_DELETE)
        {
@@ -95,6 +95,12 @@ close_error:
                journal_pos += read_len;
            }
        }
+        dsk.meta_format = hdr->version;
+        dsk.data_block_size = hdr->data_block_size;
+        dsk.csum_block_size = hdr->csum_block_size;
+        dsk.data_csum_type = hdr->data_csum_type;
+        dsk.bitmap_granularity = hdr->bitmap_granularity;
+        dsk.clean_entry_bitmap_size = (hdr->data_block_size / hdr->bitmap_granularity + 7) / 8;
        blockstore_heap_t *heap = new blockstore_heap_t(&dsk, buffer_area, log_level);
        // Load heap and just iterate it in memory
        hdr_fn(hdr);
@@ -575,7 +581,7 @@ int disk_tool_t::write_json_meta(json11::Json meta)
        {
            if (new_data_csum_size)
            {
-                fromhexstr(e["data_csum"].string_value(), new_data_csum_size,
+                fromhexstr(e["block_csums"].string_value(), new_data_csum_size,
                    ((uint8_t*)new_entry) + sizeof(clean_disk_entry) + 2*new_clean_entry_bitmap_size);
            }
            uint32_t *new_entry_csum = (uint32_t*)(((uint8_t*)new_entry) + new_clean_entry_size - 4);
@@ -616,6 +622,12 @@ int disk_tool_t::write_json_heap(json11::Json meta, json11::Json journal)
    new_data_csum_size = (new_meta_hdr->csum_block_size
        ? ((new_meta_hdr->data_block_size+new_meta_hdr->csum_block_size-1)/new_meta_hdr->csum_block_size*(new_meta_hdr->data_csum_type & 0xFF))
        : 0);
+    dsk.meta_format = new_meta_hdr->version;
+    dsk.data_block_size = new_meta_hdr->data_block_size;
+    dsk.csum_block_size = new_meta_hdr->csum_block_size;
+    dsk.data_csum_type = new_meta_hdr->data_csum_type;
+    dsk.bitmap_granularity = new_meta_hdr->bitmap_granularity;
+    dsk.clean_entry_bitmap_size = (new_meta_hdr->data_block_size / new_meta_hdr->bitmap_granularity + 7) / 8;
    new_journal_buf = NULL;
    if (new_journal_len)
    {
@@ -696,7 +708,7 @@ close_err0:
                wr->entry_type = wr_type | (write_entry["stable"].bool_value() ? BS_HEAP_STABLE : 0);
                wr->lsn = write_entry["lsn"].uint64_value();
                wr->version = write_entry["version"].uint64_value();
-                wr->size = wr->get_size(&heap);
+                wr->size = wr_size;
                if (wr_type == BS_HEAP_SMALL_WRITE || wr_type == BS_HEAP_INTENT_WRITE)
                {
                    wr->small().offset = wr_offset;
@@ -736,6 +748,7 @@ close_err0:
                    bi.offset = wr_offset;
                    bi.len = wr_len;
                }
+                wr->size = wr->get_size(&heap);
                if (write_entry["bitmap"].is_string() && wr->get_int_bitmap(&heap))
                {
                    fromhexstr(write_entry["bitmap"].string_value(), new_clean_entry_bitmap_size, wr->get_int_bitmap(&heap));
@@ -794,7 +807,7 @@ close_err:
            fromhexstr(meta_entry["bitmap"].string_value(), new_clean_entry_bitmap_size, wr->get_int_bitmap(&heap));
            fromhexstr(meta_entry["ext_bitmap"].string_value(), new_clean_entry_bitmap_size, wr->get_ext_bitmap(&heap));
            if (new_data_csum_size)
-                fromhexstr(meta_entry["data_csum"].string_value(), new_data_csum_size, wr->get_checksums(&heap));
+                fromhexstr(meta_entry["block_csums"].string_value(), new_data_csum_size, wr->get_checksums(&heap));
            wr->crc32c = wr->calc_crc32c();
            assert((uint8_t*)wr + wr->size == new_meta_buf + meta_offset + used_space);
            auto j_it = journal_by_object.find(oid);
@@ -213,7 +213,8 @@ void disk_tool_t::resize_init(blockstore_meta_header_v3_t *hdr)
    data_idx_diff = ((int64_t)(dsk.data_offset-new_data_offset))/((int64_t)dsk.data_block_size);
    free_first = new_data_offset > dsk.data_offset ? (new_data_offset-dsk.data_offset) / dsk.data_block_size : 0;
    free_last = (new_data_offset+new_data_len < dsk.data_offset+dsk.data_len)
-        ? (dsk.data_offset+dsk.data_len-new_data_offset-new_data_len) / dsk.data_block_size
+        ? ((dsk.data_offset-new_data_offset)/dsk.data_block_size +
+            dsk.data_len/dsk.data_block_size - new_data_len/dsk.data_block_size)
        : 0;
    uint32_t new_clean_entry_header_size = sizeof(clean_disk_entry) + 4 /*entry_csum*/;
    new_clean_entry_bitmap_size = dsk.data_block_size / (hdr ? hdr->bitmap_granularity : 4096) / 8;
@@ -575,15 +576,11 @@ int disk_tool_t::resize_rebuild_meta()
            new_meta_hdr->bitmap_granularity = dsk.bitmap_granularity ? dsk.bitmap_granularity : 4096;
            new_meta_hdr->data_csum_type = dsk.data_csum_type;
            new_meta_hdr->csum_block_size = dsk.csum_block_size;
-            new_meta_hdr->completed_lsn = hdr->completed_lsn;
+            new_meta_hdr->completed_lsn = hdr ? hdr->completed_lsn : 0;
            new_meta_hdr->meta_area_size = new_meta_len;
            new_meta_hdr->header_csum = 0;
            new_meta_hdr->header_csum = crc32c(0, new_meta_hdr, new_meta_hdr->version == BLOCKSTORE_META_FORMAT_HEAP
                ? sizeof(blockstore_meta_header_v3_t) : sizeof(blockstore_meta_header_v2_t));
-            if (hdr->version == BLOCKSTORE_META_FORMAT_HEAP && new_meta_format != BLOCKSTORE_META_FORMAT_HEAP)
-            {
-                build_journal_start();
-            }
        },
        [&](blockstore_heap_t *heap, heap_entry_t *obj, uint32_t meta_block_num)
        {
@@ -146,7 +146,7 @@ void kv_cli_t::run()
    // Create client
    ringloop = new ring_loop_t(512);
    epmgr = new epoll_manager_t(ringloop);
-    cli = new cluster_client_t(ringloop, epmgr->tfd, cfg);
+    cli = cluster_client_t::create(ringloop, epmgr->tfd, cfg);
    db = new vitastorkv_dbw_t(cli);
    // Load image metadata
    while (!cli->is_ready())
@@ -527,7 +527,7 @@ void kv_cli_t::handle_cmd(const std::vector<std::string> & cmd, std::function<vo
        {
            inode_id = 0;
            name = trim(name);
-            for (auto & ic: cli->st_cli.inode_config)
+            for (auto & ic: cli->st_cli->inode_config)
            {
                if (ic.second.name == name)
                {
@@ -233,7 +233,7 @@ static std::string read_string(uint8_t *data, int size, int *pos)
    }
    uint32_t len = *(uint32_t*)(data+*pos);
    *pos += sizeof(uint32_t);
-    if (*pos+len > size)
+    if (len > size-*pos)
    {
        *pos = -1;
        return "";
@@ -510,8 +510,8 @@ void kv_db_t::open(inode_t inode_id, json11::Json cfg, std::function<void(int)>
        cb(-EINVAL);
        return;
    }
-    auto pool_it = cli->st_cli.pool_config.find(INODE_POOL(inode_id));
-    if (pool_it == cli->st_cli.pool_config.end())
+    auto pool_it = cli->st_cli->pool_config.find(INODE_POOL(inode_id));
+    if (pool_it == cli->st_cli->pool_config.end())
    {
        cb(-EINVAL);
        return;
@@ -272,7 +272,7 @@ void kv_test_t::run(json11::Json cfg)
    // Create client
    ringloop = new ring_loop_t(512);
    epmgr = new epoll_manager_t(ringloop);
-    cli = new cluster_client_t(ringloop, epmgr->tfd, cfg);
+    cli = cluster_client_t::create(ringloop, epmgr->tfd, cfg);
    db = new vitastorkv_dbw_t(cli);
    // Load image metadata
    while (!cli->is_ready())
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
thebestvibedev	18c02a6bd6	Update stock/hsx.vn.md	2026-07-08 14:20:19 +07:00
thebestvibedev	253b7b3de5	Đầu tư chứng cho mau giàu	2026-07-08 14:20:00 +07:00
thebestvibedev	dbe87937a0	Trộm tiếp	2026-07-08 13:53:49 +07:00
thebestvibedev	322f06d77e	Trộm chó hahaha	2026-07-08 13:53:01 +07:00
Vitaliy Filippov	5dbc679e16	Fix padded block checksums - v2	2026-07-05 14:09:57 +03:00
Vitaliy Filippov	d48864a6be	Fix unaligned pointer warnings	2026-07-04 21:40:29 +03:00
Vitaliy Filippov	462482d319	Fix zero-padded big_write checksum verification in the new store	2026-07-04 21:37:22 +03:00
Vitaliy Filippov	5ef9d78461	Release 3.0.15 - QEMU virtual disk migration with enabled iothread is finally fixed correctly. - Fixed operation of Proxmox VMs with swTPM without enabling NBD for all disks. - Debian packages are now again built with stable Antietcd released instead of the unstable master branch. - Antietcd cluster mode previously broken in that master branch is fixed. The symptom was Antietcd being unable to elect the leader in a cluster. - Fixed monitor startup with embedded Antietcd when using IPv6. - Fixed space statistics calculation for FS and S3 pools in the new storage ([PR #127](https://github.com/vitalif/vitastor/pull/127)).	2026-06-28 11:29:38 +03:00
Vitaliy Filippov	1b20010a69	Install npm packages in debian/rules	2026-06-28 11:29:27 +03:00
Vitaliy Filippov	d750d00c6f	Fix SWTPM in Proxmox	2026-06-27 16:04:51 +03:00
Vitaliy Filippov	66cb564e2c	Fix background jobs in etcd_fail test	2026-06-27 15:42:53 +03:00
Vitaliy Filippov	f782decbd6	Update antietcd to 1.3.1	2026-06-27 15:42:42 +03:00
Vitaliy Filippov	717582c4ba	Use release builds of antietcd&tinyraft in debian packages (not master branch)	2026-06-27 10:27:15 +03:00
Vitaliy Filippov	cd62c0755f	Fix IPv6 antietcd configuration	2026-06-27 00:16:03 +03:00
zhuchengzhen001-crypto GitHub zhu.chengzhen	c6f5ab7d79	fix pool stats with no_inode_stats (#127 ) Co-authored-by: zhu.chengzhen <zhu.chengzhen@jingjiamicro.com>	2026-06-24 12:41:56 +03:00
Vitaliy Filippov	09607ddcbe	Actual fix for live migration with iothread	2026-06-23 00:07:34 +03:00
Vitaliy Filippov	278852b4d5	Release 3.0.14 How many (bugs!) I've knifed, how many I've slit! General note: most bug fixes now include regression tests to verify that they don't repeat in the future. Most bugs fixed in this release were detected by using LLM analysis (Claude Opus/Fable, GPT 5.5). OSD: - Fix OSD hanging with an infinite loop when setting autosync_interval to 0 at runtime - (IMPORTANT) Fix EC PGs hanging in REPEERING when the last final commit/rollback in a batch completes with an error - Limit pg_size by 64 because peering doesn't handle larger values with EC — they just lead to 'incomplete' objects - Fix OSD crash with an "assertion failed" error on EIO retry in snapshot chain read (i.e. when some chunks belong to a corrupted replica with checksum mismatch) - (IMPORTANT) Disable chunked PG count resharding due to possible interference with compaction changes (will be re-enabled after fixes) - (IMPORTANT) Fix incorrect snapshot allocation bitmap recovery during EC chained read - Add on-wire request size validation to prevent possible OOM/DoS/heap corruption on receiving invalid data from the network - (IMPORTANT) Fix parity-less EC writes destroying snapshot allocation bitmaps (i.e. when all parity OSDs in a PG are missing) - (IMPORTANT) Fix EC N+K, K>=2 recovery destroying snapshot allocation bitmaps of live parity chunks - (IMPORTANT) Fix a possible OSD crash during EC misplaced object scrubbing - (IMPORTANT) Verify object bitmap consistency during scrub (only data was checked previously) - (IMPORTANT) Fix corrupted object chunks incorrectly marked as non-corrupted on the second scrub - (IMPORTANT) Fix cached EC decoding of multiple stripes with ISA-L (ISA-L is the default) New store: - Fix a theoretically possible OSD crash on startup when using the previously added workaround for the "double-claim" problem - Remove theoretically possible incorrect metadata block writes during batch EC COMMITs restarted due to a full metadata area - Fix incorrect compaction counter tracking after OSD restart (could probably lead to compaction not restarted correctly after a restart) - (IMPORTANT) Fix some of parallel big_writes possibly not waiting for data fsync, thus not providing durability - Fix possible OSD crash on sync retry when io_uring is full - Fix a possible crash during startup on corrupted on-disk data with too small entry sizes Old store: - Prevent loading extra garbage metadata entries from the last 4 MB of metadata area - Fix read operations possibly crashing if a metadata read (with inmemory_metadata=false) was restarted due to a full io_uring - Fix a possible memory leak of temporary buffers and bitmaps/checksums when a read was restarted due to a full io_uring (reproducible with either inmemory_metadata=false or block_size>256k) - Fix a possible OSD crash during padded checksum reads if buffer count exceeded 1024 (IOV_MAX) (reproducible only with csum_block_size > 4k and block_size >= 4M) - (IMPORTANT) Fix partial padded read journal checksum verification with csum_block_size > 4k - Fix incorrect marking of corrupted objects as non-corrupted after flushing data from journal (with inmemory_journal=false) - (IMPORTANT) Fix deferred freeing of a different block when a block was used by a parallel read - Fix per-inode statistics not being disabled for FS and S3 pools correctly, leading to etcd overload with unneeded per-inode statistics, slower etcd operation, increased memory usage, and too many Prometheus statistics exported by the monitor Both stores: - Fix possibly left garbage in the metadata area if the first OSD startup was interrupted — metadata header is now written only after initializating metadata - Check for short reads during initialization (just in case, doesn't happen in real life) Clients: - Fix write-back queue item split in case when write-back is enabled at runtime - Implement bdrv_detach_aio_context & bdrv_attach_aio_context in the QEMU driver (should fix migration with iothread) - Do not crash on full io_uring in ublk server - Fix missing --readonly option handling in NBD server - Stop gracefully on NBD_CMD_DISC instead of just exit(0) in NBD server - Fix writeback detection in ublk server for --image mode - Limit the amount of incoming data for NFS clients to prevent choking on memory in async mount mode Tools (vitastor-disk/vitastor-cli): - Prevent vitastor-cli merge possibly exiting before completing the last sync/delete operations - Fix vitastor-disk incorrectly validating too large small_write entry length - Fix vitastor-cli merge ignoring input option validation errors - Fix vitastor-cli rm-data always skipping the final fsync - Fix vitastor-disk resize not moving the last used data block - Fix vitastor-disk write-meta incorrectly importing new store small_write entries - Fix vitastor-disk write-journal and write-meta importing old store data incorrectly when csum_block_size is > 4k - Support --io option for vitastor-disk dump-journal/write-journal - Fix vitastor-disk resize crash when converting from very old (0.5.x) metadata - Fix vitastor-disk trim incorrectly rounding block ranges with --discard_granularity option explicitly set to a value > 4k, possibly leading to discarding live data - Fix vitastor-disk write-meta importing new store metadata incorrectly with > 4 GB metadata area size - (IMPORTANT) Fix vitastor-cli modify --resize to a smaller size clearing all image data O_o Other: - Do not crash with an uncaught exception when an invalid /osd/state/ with a non-numeric suffix is present in etcd (in OSD and all client services) - Fix possible crash in vitastor-kv when handling a corrupted DB due to a uint32 overflow - Fix NFS-RDMA memory allocator crashing in some situations - Fix small shared file extend-write potentially reading unallocated memory (NFS) - Add bounds checks to prevent uint32 overflows in NFS/XDR - Re-enable accidentally disabled safety checks (asserts) in files with included cpp-btree - Fix too small memory allocation in NFS portmap	2026-06-21 18:17:02 +03:00
Vitaliy Filippov	7b11c6e90d	Add a regression test for v1 store attempting to load overflowing garbage from the end of metadata area (commit `6b003bcc34`)	2026-06-21 17:23:50 +03:00
Vitaliy Filippov	6251ce8b9a	Add a regression test for incorrect deferred freeing of data block (commit `43aa4cfff6`)	2026-06-21 16:49:38 +03:00
Vitaliy Filippov	d4a42f61cf	Handle full io_uring in ublk-server	2026-06-21 01:40:49 +03:00
Vitaliy Filippov	6b003bcc34	Protect against done_cnt > block_count, just in case	2026-06-20 21:05:06 +03:00
Vitaliy Filippov	1c945bcb41	Make check_completed a macro in test_cluster_client	2026-06-20 20:18:31 +03:00
Vitaliy Filippov	716527b184	Fix missing --readonly handling in NBD server	2026-06-20 11:52:29 +03:00
Vitaliy Filippov	8c0486bd76	Fix bounds check in kv_db (fix invalid input handling?)	2026-06-20 11:43:33 +03:00
Vitaliy Filippov	d2cf271f64	Track in_flight for sync & delete in vitastor-cli merge	2026-06-20 11:43:33 +03:00
Vitaliy Filippov	d93b488e32	Just in case - OP_SYNC cannot fail but handle its error in vitastor-cli dd	2026-06-20 11:43:33 +03:00
Vitaliy Filippov	fbffec5abb	Add a regression test for the last 2 fixed bugs	2026-06-20 11:18:09 +03:00
Vitaliy Filippov	b6eb8f2055	Add missing sqe retries on metadata read	2026-06-20 11:15:38 +03:00
Vitaliy Filippov	e373ea2163	Fix freeing of dyn_data and temp metadata block buffers on read cancel A regression test would also be fun	2026-06-20 02:10:11 +03:00
Vitaliy Filippov	5e12b4a1a5	Fix OOB read in old store checksum read if block count exceeds IOV_MAX (almost unreachable) May be fun to write a regression test for it :) IOV_MAX is 1024, so it requires at least a 4 MB object...	2026-06-20 02:03:45 +03:00
Vitaliy Filippov	78b067566f	Do not use std::stoull as it may throw	2026-06-20 01:54:49 +03:00
Vitaliy Filippov	cf3abdb9e3	Clear autosync_timer when autosync_interval is set to 0 Clear other timers similarly (but their interval can't be 0)	2026-06-20 01:50:44 +03:00
Vitaliy Filippov	826b35b369	Do not try to erase_double_claim entries during iteration	2026-06-19 22:05:44 +03:00
Vitaliy Filippov	cdc730314b	Fix EC PGs hanging in REPEERING when flush error is last in the batch	2026-06-19 01:49:26 +03:00
Vitaliy Filippov	5248d7f324	Fix 2 bugs in NFS-RDMA allocator, add a test for both 1) alloc() could add the region start into freelist instead of its free part 2) free() was merging freed buffers incorrectly both forward and backward	2026-06-19 02:08:41 +03:00
Vitaliy Filippov	4161f0bd01	Remove doubtful metadata block write logic from blockstore_stable on metadata ENOSPC	2026-06-18 00:55:57 +03:00
Vitaliy Filippov	5627977a9b	Limit pg_size by 64	2026-06-18 00:24:48 +03:00
Vitaliy Filippov	ec9cfa76c1	Fix to_compact_count tracking on load in the new store	2026-06-18 00:21:03 +03:00
Vitaliy Filippov	0c88884576	Fix incorrect batch big_write fsync logic in the new store	2026-06-18 00:04:15 +03:00
Vitaliy Filippov	ba7637d9ad	Add a test for incorrect batch big_write fsync logic in the new store	2026-06-18 00:04:15 +03:00
Vitaliy Filippov	ac1025c7a5	Fix read small_write.len before init	2026-06-17 17:41:51 +03:00
Vitaliy Filippov	2a81cef78a	Fix crash on EIO retry in chained read	2026-06-17 16:38:20 +03:00
Vitaliy Filippov	bcf6a7c7d1	Fix write-back queued items split in the client	2026-06-17 16:15:39 +03:00
Vitaliy Filippov	85c4be3957	Clear lsn on sync retry to prevent possible crash on full io_uring	2026-06-17 15:40:05 +03:00
Vitaliy Filippov	cf2ba05e4b	Disable chunked resharding -- it may interfere with journal flushing; will be re-enabled after fixes	2026-06-17 15:35:19 +03:00
Vitaliy Filippov	04c2f8d408	Stop gracefully on NBD_CMD_DISC instead of just exit(0)	2026-06-17 12:46:03 +03:00
Vitaliy Filippov	0e528ca8f3	Fix missing start_merge() error check	2026-06-17 12:42:23 +03:00
Vitaliy Filippov	c6f733b96a	Fix final sync in vitastor-cli rm-data	2026-06-17 12:41:22 +03:00
Vitaliy Filippov	938ac09248	Fix small shared file extend-write potentially reading unallocated memory	2026-06-17 12:36:04 +03:00
Vitaliy Filippov	3becdbf5b9	Add bounds checks to prevent uint32 overflows in NFS/XDR	2026-06-17 12:04:50 +03:00
Vitaliy Filippov	9c49315fdf	Fix moving of the last block in vitastor-disk resize	2026-06-17 01:19:12 +03:00
Vitaliy Filippov	430d3cfb6f	Add a dump\|load test, fix multiple bugs in both new&old dump/load utils Details: - New store dump/write-meta didn't use actual metadata parameters from the header - New store write-meta calculated small entry sizes incorrectly - Old store write-journal imported entries with checksums incorrectly - Old store write-meta didn't import block_csums at all (it was using a wrong json key)	2026-06-17 01:19:12 +03:00
Vitaliy Filippov	c491db699c	Implement bdrv_detach_aio_context & bdrv_attach_aio_context (should fix migration with iothread)	2026-06-17 00:39:28 +03:00
Vitaliy Filippov	e9d053e30f	Support --io option for vitastor-disk dump-journal/write-journal	2026-06-17 00:39:28 +03:00
Vitaliy Filippov	1be51f903c	Check entry sizes in blockstore_heap during loading	2026-06-16 20:34:52 +03:00
Vitaliy Filippov	cd51f14a90	Fix incorrect chained_read bitmap recovery	2026-06-15 21:10:44 +03:00
Vitaliy Filippov	9b8107875f	Add a regression test for incorrect chained_read bitmap recovery	2026-06-15 21:10:44 +03:00
Vitaliy Filippov	ca606570f7	Add request size validation	2026-06-15 01:56:54 +03:00
Vitaliy Filippov	22d094ccc6	Add a regression test to check that parity-less EC writes do not destroy bitmaps	2026-06-15 01:56:54 +03:00
Vitaliy Filippov	fd84d84279	Add a regression test for scrub bitmap comparison (EC 3+3, only chunk 1 written and lost)	2026-06-15 01:52:04 +03:00
Vitaliy Filippov	af2b1e28e3	Add a regression test for EC bitmap recovery losing a parity chunk	2026-06-15 01:52:04 +03:00
Vitaliy Filippov	9dda449f48	Fix fully-degraded EC writes destroying bitmaps	2026-06-15 01:52:04 +03:00
Vitaliy Filippov	e6d4b32629	Also check padded small_write	2026-06-15 01:31:19 +03:00
Vitaliy Filippov	4de22a08e2	Fix partial padded read checksum verification	2026-06-15 01:31:19 +03:00
Vitaliy Filippov	a403de46b3	Test partial padded read	2026-06-15 01:31:19 +03:00
Vitaliy Filippov	ac20f605f6	Fix scrub bitmap comparison	2026-06-15 01:31:19 +03:00
Vitaliy Filippov	51ecbadb12	Only update bitmaps when writing data in primary subops Fixes fully degraded EC writes and recovering EC writes corrupting bitmaps	2026-06-15 01:31:19 +03:00
Vitaliy Filippov	6a4627b625	Write a test for store v1 & journal corruption preservation, fix MULTIPLE bugs	2026-06-14 11:23:36 +03:00
Vitaliy Filippov	fd2b8b8792	Fix ec_check_combination more correctly (fixes osd_rmw_test_je)	2026-06-13 19:56:06 +03:00
Vitaliy Filippov	f3d662bac7	Verify bitmaps during scrub	2026-06-13 19:56:06 +03:00
Vitaliy Filippov	553cc8ef87	Add a test for replicated bitmap scrub	2026-06-13 19:56:06 +03:00
Vitaliy Filippov	67fdf1142b	Fix vitastor-disk crash when converting from 0.5.x metadata	2026-06-13 19:56:06 +03:00
Vitaliy Filippov	02f6e564a6	Old store - write header on init only after clearing metadata	2026-06-13 19:56:06 +03:00
Vitaliy Filippov	33d14061d6	New store - write header on init only after clearing metadata	2026-06-13 19:56:06 +03:00
Vitaliy Filippov	677e755e4e	Replace VLA with a vector and also fix invalid dangling pointer warnings	2026-06-13 19:56:06 +03:00
Vitaliy Filippov	11a972cbfb	Delete pg.peering_state when it is not needed	2026-06-13 19:56:06 +03:00
Vitaliy Filippov	1834743a0e	Fix incorrect clearing of LOC_CORRUPTED on the second scrub	2026-06-13 19:56:06 +03:00
Vitaliy Filippov	213f76c66c	Add a regression test for LOC_CORRUPTED cleared on second scrub	2026-06-13 19:56:06 +03:00
Vitaliy Filippov	91698404a7	Add a basic OSD test as an example	2026-06-13 19:56:06 +03:00
Vitaliy Filippov	27bd38d95e	Allow to create OSD with mocked blockstore and network	2026-06-13 19:56:06 +03:00
Vitaliy Filippov	ef0e61be1b	Split and mock etcd_state_client_t for testing	2026-06-13 19:56:06 +03:00
Vitaliy Filippov	26fb08d7da	Change st_cli to pointer	2026-06-13 19:56:06 +03:00
Vitaliy Filippov	80fa3094b3	Fix cpp-btree disabling asserts everywhere it is included to!	2026-06-13 19:56:06 +03:00
Vitaliy Filippov	df931b1e17	Check for short reads in blockstore init	2026-06-13 19:56:06 +03:00
Vitaliy Filippov	906294ae9a	Fix ec_check_combination() short tmp_buf allocation	2026-06-13 19:56:05 +03:00
Vitaliy Filippov	15f69719e4	Not an actual bug, clean up fsync conditions for clarity It could be a bug if data_fd could be equal to journal_fd but not to meta_fd, but it can't.	2026-06-13 19:55:47 +03:00
Vitaliy Filippov	43aa4cfff6	Fix incorrect deferred freeing of block used by a parallel read in the old store	2026-06-13 19:55:47 +03:00
Vitaliy Filippov	6901227390	Fix cached EC decoding of multiple stripes with ISA-L	2026-06-10 02:07:58 +03:00
Vitaliy Filippov	7f718feaf6	Fix alloc in nfs_portmap	2026-06-10 01:02:30 +03:00
Vitaliy Filippov	236ffbb24e	Fix multilist_alloc_t bug (not triggerable in real operation but still a bug)	2026-06-10 01:01:20 +03:00
Vitaliy Filippov	0e300f4c50	Fix incorrect rounding in vitastor-disk trim when --discard_granularity option is passed	2026-06-10 00:38:34 +03:00
Vitaliy Filippov	6d82a3daa3	Fix fill_block_empty_space argument type (ui32 -> ui64)	2026-06-10 00:33:31 +03:00
Vitaliy Filippov	c0c01a8e57	Fix writeback detection in ublk server for --image mode	2026-06-10 00:31:48 +03:00
Vitaliy Filippov	334755e912	Fix vitastor-disk resize to smaller size clearing all data O_o, add a test for it	2026-06-10 00:30:42 +03:00
Vitaliy Filippov	c16f955a51	Limit the amount of incoming data for NFS clients to prevent choking on memory	2026-06-06 13:56:20 +03:00
Vitaliy Filippov	c1dc14f5ee	Fix old store no_inode_stats not working	2026-06-05 00:50:53 +03:00