Introduce image names and metadata storage in etcd

Each inode has: image name, parent inode number & pool, size and readonly flag

Snapshots are created by switching image name to a different inode number
while using the older inode as parent.

README.md

@@ -35,6 +35,8 @@ breaking changes in the future. However, the following is implemented:
 - Inode removal tool (vitastor-rm)
 - Packaging for Debian and CentOS
 - Per-inode I/O and space usage statistics
+- Inode metadata storage in etcd
+- Snapshots and copy-on-write image clones
 
 ## Roadmap
 
@@ -42,8 +44,6 @@ breaking changes in the future. However, the following is implemented:
 - Other administrative tools
 - Proxmox and OpenNebula plugins
 - iSCSI proxy
-- Inode metadata storage in etcd
-- Snapshots and copy-on-write image clones
 - Operation timeouts and better failure detection
 - Scrubbing without checksums (verification of replicas)
 - Checksums

mon/mon.js

@@ -149,6 +149,7 @@ const etcd_tree = {
             <pool_id>: {
                 <inode_t>: {
                     name: string,
+                    size?: uint64_t, // bytes
                     parent_pool?: <pool_id>,
                     parent_id?: <inode_t>,
                     readonly?: boolean,

src/etcd_state_client.cpp

@@ -11,6 +11,11 @@
 
 etcd_state_client_t::~etcd_state_client_t()
 {
+    for (auto watch: watches)
+    {
+        delete watch;
+    }
+    watches.clear();
     etcd_watches_initialised = -1;
 #ifndef __MOCK__
     if (etcd_watch_ws)
@@ -662,6 +667,22 @@ void etcd_state_client_t::parse_state(const std::string & key, const json11::Jso
         else
         {
             inode_num |= (pool_id << (64-POOL_ID_BITS));
+            auto it = this->inode_config.find(inode_num);
+            if (it != this->inode_config.end() && it->second.name != "")
+            {
+                auto n_it = this->inode_by_name.find(it->second.name);
+                if (n_it->second == inode_num)
+                {
+                    this->inode_by_name.erase(n_it);
+                    for (auto w: watches)
+                    {
+                        if (w->name == it->second.name)
+                        {
+                            w->cfg = { 0 };
+                        }
+                    }
+                }
+            }
             if (!value.is_object())
             {
                 this->inode_config.erase(inode_num);
@@ -685,12 +706,52 @@ void etcd_state_client_t::parse_state(const std::string & key, const json11::Jso
                     else
                         parent_inode_num |= parent_pool_id << (64-POOL_ID_BITS);
                 }
-                this->inode_config[inode_num] = (inode_config_t){
+                inode_config_t cfg = (inode_config_t){
+                    .num = inode_num,
                     .name = value["name"].string_value(),
+                    .size = value["size"].uint64_value(),
                     .parent_id = parent_inode_num,
                     .readonly = value["readonly"].bool_value(),
                 };
+                this->inode_config[inode_num] = cfg;
+                if (cfg.name != "")
+                {
+                    this->inode_by_name[cfg.name] = inode_num;
+                    for (auto w: watches)
+                    {
+                        if (w->name == value["name"].string_value())
+                        {
+                            w->cfg = cfg;
+                        }
+                    }
+                }
             }
         }
     }
 }
+
+inode_watch_t* etcd_state_client_t::watch_inode(std::string name)
+{
+    inode_watch_t *watch = new inode_watch_t;
+    watch->name = name;
+    watches.push_back(watch);
+    auto it = inode_by_name.find(name);
+    if (it != inode_by_name.end())
+    {
+        watch->cfg = inode_config[it->second];
+    }
+    return watch;
+}
+
+void etcd_state_client_t::close_watch(inode_watch_t* watch)
+{
+    for (int i = 0; i < watches.size(); i++)
+    {
+        if (watches[i] == watch)
+        {
+            watches.erase(watches.begin()+i, watches.begin()+i+1);
+            break;
+        }
+    }
+    delete watch;
+}

src/etcd_state_client.h

@@ -54,16 +54,25 @@ struct pool_config_t
 
 struct inode_config_t
 {
+    uint64_t num;
     std::string name;
+    uint64_t size;
     inode_t parent_id;
     bool readonly;
 };
 
+struct inode_watch_t
+{
+    std::string name;
+    inode_config_t cfg;
+};
+
 struct websocket_t;
 
 struct etcd_state_client_t
 {
 protected:
+    std::vector<inode_watch_t*> watches;
     websocket_t *etcd_watch_ws = NULL;
     uint64_t bs_block_size = DEFAULT_BLOCK_SIZE;
     void add_etcd_url(std::string);
@@ -78,6 +87,7 @@ public:
     std::map<pool_id_t, pool_config_t> pool_config;
     std::map<osd_num_t, json11::Json> peer_states;
     std::map<inode_t, inode_config_t> inode_config;
+    std::map<std::string, inode_t> inode_by_name;
 
     std::function<void(json11::Json::object &)> on_change_hook;
     std::function<void(json11::Json::object &)> on_load_config_hook;
@@ -95,5 +105,7 @@ public:
     void parse_state(const json_kv_t & kv);
     void parse_state(const std::string & key, const json11::Json & value);
     void parse_config(json11::Json & config);
+    inode_watch_t* watch_inode(std::string name);
+    void close_watch(inode_watch_t* watch);
     ~etcd_state_client_t();
 };

src/fio_cluster.cpp

@@ -6,17 +6,17 @@
 // Random write:
 //
 // fio -thread -ioengine=./libfio_cluster.so -name=test -bs=4k -direct=1 -fsync=16 -iodepth=16 -rw=randwrite \
-//     -etcd=127.0.0.1:2379 [-etcd_prefix=/vitastor] -pool=1 -inode=1 -size=1000M
+//     -etcd=127.0.0.1:2379 [-etcd_prefix=/vitastor] (-image=testimg | -pool=1 -inode=1 -size=1000M)
 //
 // Linear write:
 //
 // fio -thread -ioengine=./libfio_cluster.so -name=test -bs=128k -direct=1 -fsync=32 -iodepth=32 -rw=write \
-//     -etcd=127.0.0.1:2379 [-etcd_prefix=/vitastor] -pool=1 -inode=1 -size=1000M
+//     -etcd=127.0.0.1:2379 [-etcd_prefix=/vitastor] -image=testimg
 //
 // Random read (run with -iodepth=32 or -iodepth=1):
 //
 // fio -thread -ioengine=./libfio_cluster.so -name=test -bs=4k -direct=1 -iodepth=32 -rw=randread \
-//     -etcd=127.0.0.1:2379 [-etcd_prefix=/vitastor] -pool=1 -inode=1 -size=1000M
+//     -etcd=127.0.0.1:2379 [-etcd_prefix=/vitastor] -image=testimg
 
 #include <sys/types.h>
 #include <sys/socket.h>
@@ -35,6 +35,7 @@ struct sec_data
     ring_loop_t *ringloop = NULL;
     epoll_manager_t *epmgr = NULL;
     cluster_client_t *cli = NULL;
+    inode_watch_t *watch = NULL;
     bool last_sync = false;
     /* The list of completed io_u structs. */
     std::vector<io_u*> completed;
@@ -47,6 +48,7 @@ struct sec_options
     int __pad;
     char *etcd_host = NULL;
     char *etcd_prefix = NULL;
+    char *image = NULL;
     uint64_t pool = 0;
     uint64_t inode = 0;
     int cluster_log = 0;
@@ -64,7 +66,7 @@ static struct fio_option options[] = {
         .group  = FIO_OPT_G_FILENAME,
     },
     {
-        .name   = "etcd",
+        .name   = "etcd_prefix",
         .lname  = "etcd key prefix",
         .type   = FIO_OPT_STR_STORE,
         .off1   = offsetof(struct sec_options, etcd_prefix),
@@ -72,6 +74,15 @@ static struct fio_option options[] = {
         .category = FIO_OPT_C_ENGINE,
         .group  = FIO_OPT_G_FILENAME,
     },
+    {
+        .name   = "image",
+        .lname  = "Vitastor image name",
+        .type   = FIO_OPT_STR_STORE,
+        .off1   = offsetof(struct sec_options, image),
+        .help   = "Vitastor image name to run tests on",
+        .category = FIO_OPT_C_ENGINE,
+        .group  = FIO_OPT_G_FILENAME,
+    },
     {
         .name   = "pool",
         .lname  = "pool number for the inode",
@@ -86,7 +97,7 @@ static struct fio_option options[] = {
         .lname  = "inode to run tests on",
         .type   = FIO_OPT_INT,
         .off1   = offsetof(struct sec_options, inode),
-        .help   = "inode to run tests on (1 by default)",
+        .help   = "inode number to run tests on",
         .category = FIO_OPT_C_ENGINE,
         .group  = FIO_OPT_G_FILENAME,
     },
@@ -141,6 +152,51 @@ static int sec_setup(struct thread_data *td)
         td->o.open_files++;
     }
 
+    json11::Json cfg = json11::Json::object {
+        { "etcd_address", std::string(o->etcd_host) },
+        { "etcd_prefix", std::string(o->etcd_prefix ? o->etcd_prefix : "/vitastor") },
+        { "log_level", o->cluster_log },
+    };
+
+    if (!o->image)
+    {
+        if (!(o->inode & ((1l << (64-POOL_ID_BITS)) - 1)))
+        {
+            td_verror(td, EINVAL, "inode number is missing");
+            return 1;
+        }
+        if (o->pool)
+        {
+            o->inode = (o->inode & ((1l << (64-POOL_ID_BITS)) - 1)) | (o->pool << (64-POOL_ID_BITS));
+        }
+        if (!(o->inode >> (64-POOL_ID_BITS)))
+        {
+            td_verror(td, EINVAL, "pool is missing");
+            return 1;
+        }
+    }
+    else
+    {
+        o->inode = 0;
+    }
+    bsd->ringloop = new ring_loop_t(512);
+    bsd->epmgr = new epoll_manager_t(bsd->ringloop);
+    bsd->cli = new cluster_client_t(bsd->ringloop, bsd->epmgr->tfd, cfg);
+    if (o->image)
+    {
+        while (!bsd->cli->is_ready())
+        {
+            bsd->ringloop->loop();
+            if (bsd->cli->is_ready())
+                break;
+            bsd->ringloop->wait();
+        }
+        bsd->watch = bsd->cli->st_cli.watch_inode(std::string(o->image));
+        td->files[0]->real_file_size = bsd->watch->cfg.size;
+    }
+
+    bsd->trace = o->trace ? true : false;
+
     return 0;
 }
 
@@ -149,6 +205,10 @@ static void sec_cleanup(struct thread_data *td)
     sec_data *bsd = (sec_data*)td->io_ops_data;
     if (bsd)
     {
+        if (bsd->watch)
+        {
+            bsd->cli->st_cli.close_watch(bsd->watch);
+        }
         delete bsd->cli;
         delete bsd->epmgr;
         delete bsd->ringloop;
@@ -159,28 +219,6 @@ static void sec_cleanup(struct thread_data *td)
 /* Connect to the server from each thread. */
 static int sec_init(struct thread_data *td)
 {
-    sec_options *o = (sec_options*)td->eo;
-    sec_data *bsd = (sec_data*)td->io_ops_data;
-
-    json11::Json cfg = json11::Json::object {
-        { "etcd_address", std::string(o->etcd_host) },
-        { "etcd_prefix", std::string(o->etcd_prefix ? o->etcd_prefix : "/vitastor") },
-        { "log_level", o->cluster_log },
-    };
-
-    if (o->pool)
-        o->inode = (o->inode & ((1l << (64-POOL_ID_BITS)) - 1)) | (o->pool << (64-POOL_ID_BITS));
-    if (!(o->inode >> (64-POOL_ID_BITS)))
-    {
-        td_verror(td, EINVAL, "pool is missing");
-        return 1;
-    }
-    bsd->ringloop = new ring_loop_t(512);
-    bsd->epmgr = new epoll_manager_t(bsd->ringloop);
-    bsd->cli = new cluster_client_t(bsd->ringloop, bsd->epmgr->tfd, cfg);
-
-    bsd->trace = o->trace ? true : false;
-
     return 0;
 }
 
@@ -200,19 +238,23 @@ static enum fio_q_status sec_queue(struct thread_data *td, struct io_u *io)
     io->engine_data = bsd;
     cluster_op_t *op = new cluster_op_t;
 
+    op->inode = opt->image ? bsd->watch->cfg.num : opt->inode;
     switch (io->ddir)
     {
     case DDIR_READ:
         op->opcode = OSD_OP_READ;
-        op->inode = opt->inode;
         op->offset = io->offset;
         op->len = io->xfer_buflen;
         op->iov.push_back(io->xfer_buf, io->xfer_buflen);
         bsd->last_sync = false;
         break;
     case DDIR_WRITE:
+        if (opt->image && bsd->watch->cfg.readonly)
+        {
+            io->error = EROFS;
+            return FIO_Q_COMPLETED;
+        }
         op->opcode = OSD_OP_WRITE;
-        op->inode = opt->inode;
         op->offset = io->offset;
         op->len = io->xfer_buflen;
         op->iov.push_back(io->xfer_buf, io->xfer_buflen);

src/qemu_driver.c

@@ -39,12 +39,14 @@ void DSO_STAMP_FUN(void)
 typedef struct VitastorClient
 {
     void *proxy;
+    void *watch;
     char *etcd_host;
     char *etcd_prefix;
+    char *image;
     uint64_t inode;
     uint64_t pool;
     uint64_t size;
-    int readonly;
+    long readonly;
     QemuMutex mutex;
 } VitastorClient;
 
@@ -53,10 +55,14 @@ typedef struct VitastorRPC
     BlockDriverState *bs;
     Coroutine *co;
     QEMUIOVector *iov;
-    int ret;
+    long ret;
     int complete;
 } VitastorRPC;
 
+static void vitastor_co_init_task(BlockDriverState *bs, VitastorRPC *task);
+static void vitastor_co_generic_bh_cb(long retval, void *opaque);
+static void vitastor_close(BlockDriverState *bs);
+
 static char *qemu_rbd_next_tok(char *src, char delim, char **p)
 {
     char *end;
@@ -132,21 +138,24 @@ static void vitastor_parse_filename(const char *filename, QDict *options, Error
             qdict_put_str(options, name, value);
         }
     }
-    if (!qdict_get_try_int(options, "inode", 0))
+    if (!qdict_get_try_str(options, "image"))
     {
-        error_setg(errp, "inode is missing");
-        goto out;
-    }
-    if (!(qdict_get_try_int(options, "inode", 0) >> (64-POOL_ID_BITS)) &&
-        !qdict_get_try_int(options, "pool", 0))
-    {
-        error_setg(errp, "pool number is missing");
-        goto out;
-    }
-    if (!qdict_get_try_int(options, "size", 0))
-    {
-        error_setg(errp, "size is missing");
-        goto out;
+        if (!qdict_get_try_int(options, "inode", 0))
+        {
+            error_setg(errp, "one of image (name) and inode (number) must be specified");
+            goto out;
+        }
+        if (!(qdict_get_try_int(options, "inode", 0) >> (64-POOL_ID_BITS)) &&
+            !qdict_get_try_int(options, "pool", 0))
+        {
+            error_setg(errp, "pool number must be specified or included in the inode number");
+            goto out;
+        }
+        if (!qdict_get_try_int(options, "size", 0))
+        {
+            error_setg(errp, "size must be specified when inode number is used instead of image name");
+            goto out;
+        }
     }
     if (!qdict_get_str(options, "etcd_host"))
     {
@@ -159,27 +168,86 @@ out:
     return;
 }
 
+static void coroutine_fn vitastor_co_get_metadata(VitastorRPC *task)
+{
+    BlockDriverState *bs = task->bs;
+    VitastorClient *client = bs->opaque;
+    task->co = qemu_coroutine_self();
+
+    qemu_mutex_lock(&client->mutex);
+    vitastor_proxy_watch_metadata(client->proxy, client->image, vitastor_co_generic_bh_cb, task);
+    qemu_mutex_unlock(&client->mutex);
+
+    while (!task->complete)
+    {
+        qemu_coroutine_yield();
+    }
+}
+
 static int vitastor_file_open(BlockDriverState *bs, QDict *options, int flags, Error **errp)
 {
     VitastorClient *client = bs->opaque;
     int64_t ret = 0;
+    qemu_mutex_init(&client->mutex);
     client->etcd_host = g_strdup(qdict_get_try_str(options, "etcd_host"));
     client->etcd_prefix = g_strdup(qdict_get_try_str(options, "etcd_prefix"));
-    client->inode = qdict_get_int(options, "inode");
-    client->pool = qdict_get_int(options, "pool");
-    if (client->pool)
-        client->inode = (client->inode & ((1l << (64-POOL_ID_BITS)) - 1)) | (client->pool << (64-POOL_ID_BITS));
-    client->size = qdict_get_int(options, "size");
-    client->readonly = (flags & BDRV_O_RDWR) ? 1 : 0;
     client->proxy = vitastor_proxy_create(bdrv_get_aio_context(bs), client->etcd_host, client->etcd_prefix);
-    //client->aio_context = bdrv_get_aio_context(bs);
+    client->image = g_strdup(qdict_get_try_str(options, "image"));
+    client->readonly = (flags & BDRV_O_RDWR) ? 1 : 0;
+    if (client->image)
+    {
+        // Get image metadata (size and readonly flag)
+        VitastorRPC task;
+        task.complete = 0;
+        task.bs = bs;
+        if (qemu_in_coroutine())
+        {
+            vitastor_co_get_metadata(&task);
+        }
+        else
+        {
+            assert(qemu_get_current_aio_context() == qemu_get_aio_context());
+            qemu_coroutine_enter(qemu_coroutine_create((void(*)(void*))vitastor_co_get_metadata, &task));
+        }
+        BDRV_POLL_WHILE(bs, !task.complete);
+        client->watch = (void*)task.ret;
+        client->readonly = client->readonly || vitastor_proxy_get_readonly(client->watch);
+        client->size = vitastor_proxy_get_size(client->watch);
+        if (!vitastor_proxy_get_inode_num(client->watch))
+        {
+            error_setg(errp, "image does not exist");
+            vitastor_close(bs);
+        }
+        if (!client->size)
+        {
+            client->size = qdict_get_int(options, "size");
+        }
+    }
+    else
+    {
+        client->watch = NULL;
+        client->inode = qdict_get_int(options, "inode");
+        client->pool = qdict_get_int(options, "pool");
+        if (client->pool)
+        {
+            client->inode = (client->inode & ((1l << (64-POOL_ID_BITS)) - 1)) | (client->pool << (64-POOL_ID_BITS));
+        }
+        client->size = qdict_get_int(options, "size");
+    }
+    if (!client->size)
+    {
+        error_setg(errp, "image size not specified");
+        vitastor_close(bs);
+        return -1;
+    }
     bs->total_sectors = client->size / BDRV_SECTOR_SIZE;
+    //client->aio_context = bdrv_get_aio_context(bs);
     qdict_del(options, "etcd_host");
     qdict_del(options, "etcd_prefix");
+    qdict_del(options, "image");
     qdict_del(options, "inode");
     qdict_del(options, "pool");
     qdict_del(options, "size");
-    qemu_mutex_init(&client->mutex);
     return ret;
 }
 
@@ -191,6 +259,8 @@ static void vitastor_close(BlockDriverState *bs)
     g_free(client->etcd_host);
     if (client->etcd_prefix)
         g_free(client->etcd_prefix);
+    if (client->image)
+        g_free(client->image);
 }
 
 #if QEMU_VERSION_MAJOR >= 3
@@ -296,7 +366,7 @@ static void vitastor_co_init_task(BlockDriverState *bs, VitastorRPC *task)
     };
 }
 
-static void vitastor_co_generic_bh_cb(int retval, void *opaque)
+static void vitastor_co_generic_bh_cb(long retval, void *opaque)
 {
     VitastorRPC *task = opaque;
     task->ret = retval;
@@ -319,8 +389,9 @@ static int coroutine_fn vitastor_co_preadv(BlockDriverState *bs, uint64_t offset
     vitastor_co_init_task(bs, &task);
     task.iov = iov;
 
+    uint64_t inode = client->watch ? vitastor_proxy_get_inode_num(client->watch) : client->inode;
     qemu_mutex_lock(&client->mutex);
-    vitastor_proxy_rw(0, client->proxy, client->inode, offset, bytes, iov->iov, iov->niov, vitastor_co_generic_bh_cb, &task);
+    vitastor_proxy_rw(0, client->proxy, inode, offset, bytes, iov->iov, iov->niov, vitastor_co_generic_bh_cb, &task);
     qemu_mutex_unlock(&client->mutex);
 
     while (!task.complete)
@@ -338,8 +409,9 @@ static int coroutine_fn vitastor_co_pwritev(BlockDriverState *bs, uint64_t offse
     vitastor_co_init_task(bs, &task);
     task.iov = iov;
 
+    uint64_t inode = client->watch ? vitastor_proxy_get_inode_num(client->watch) : client->inode;
     qemu_mutex_lock(&client->mutex);
-    vitastor_proxy_rw(1, client->proxy, client->inode, offset, bytes, iov->iov, iov->niov, vitastor_co_generic_bh_cb, &task);
+    vitastor_proxy_rw(1, client->proxy, inode, offset, bytes, iov->iov, iov->niov, vitastor_co_generic_bh_cb, &task);
     qemu_mutex_unlock(&client->mutex);
 
     while (!task.complete)

src/qemu_proxy.cpp

@@ -126,4 +126,38 @@ void vitastor_proxy_sync(void *client, VitastorIOHandler cb, void *opaque)
     p->cli->execute(op);
 }
 
+void vitastor_proxy_watch_metadata(void *client, char *image, VitastorIOHandler cb, void *opaque)
+{
+    QemuProxy *p = (QemuProxy*)client;
+    p->cli->on_ready([&]()
+    {
+        auto watch = p->cli->st_cli.watch_inode(std::string(image));
+        cb((long)watch, opaque);
+    });
+}
+
+void vitastor_proxy_close_watch(void *client, void *watch)
+{
+    QemuProxy *p = (QemuProxy*)client;
+    p->cli->st_cli.close_watch((inode_watch_t*)watch);
+}
+
+uint64_t vitastor_proxy_get_size(void *watch_ptr)
+{
+    inode_watch_t *watch = (inode_watch_t*)watch_ptr;
+    return watch->cfg.size;
+}
+
+uint64_t vitastor_proxy_get_inode_num(void *watch_ptr)
+{
+    inode_watch_t *watch = (inode_watch_t*)watch_ptr;
+    return watch->cfg.num;
+}
+
+int vitastor_proxy_get_readonly(void *watch_ptr)
+{
+    inode_watch_t *watch = (inode_watch_t*)watch_ptr;
+    return watch->cfg.readonly;
+}
+
 }

src/qemu_proxy.h

@@ -15,12 +15,17 @@ extern "C" {
 #endif
 
 // Our exports
-typedef void VitastorIOHandler(int retval, void *opaque);
+typedef void VitastorIOHandler(long retval, void *opaque);
 void* vitastor_proxy_create(AioContext *ctx, const char *etcd_host, const char *etcd_prefix);
 void vitastor_proxy_destroy(void *client);
 void vitastor_proxy_rw(int write, void *client, uint64_t inode, uint64_t offset, uint64_t len,
     struct iovec *iov, int iovcnt, VitastorIOHandler cb, void *opaque);
 void vitastor_proxy_sync(void *client, VitastorIOHandler cb, void *opaque);
+void vitastor_proxy_watch_metadata(void *client, char *image, VitastorIOHandler cb, void *opaque);
+void vitastor_proxy_close_watch(void *client, void *watch);
+uint64_t vitastor_proxy_get_size(void *watch);
+uint64_t vitastor_proxy_get_inode_num(void *watch);
+int vitastor_proxy_get_readonly(void *watch);
 
 #ifdef __cplusplus
 }

tests/test_snapshot.sh

@@ -38,14 +38,18 @@ fi
 
 # Test basic write and snapshot
 
+$ETCDCTL put /vitastor/config/inode/1/2 '{"name":"testimg","size":'$((32*1024*1024))'}'
+
 LD_PRELOAD=libasan.so.5 \
-    fio -thread -name=test -ioengine=build/src/libfio_vitastor.so -bs=4M -direct=1 -iodepth=1 -fsync=1 -rw=write -etcd=$ETCD_URL -pool=1 -inode=2 -size=32M -cluster_log_level=10
+    fio -thread -name=test -ioengine=build/src/libfio_vitastor.so -bs=4M -direct=1 -iodepth=1 -fsync=1 -rw=write \
+        -etcd=$ETCD_URL -pool=1 -inode=2 -size=32M -cluster_log_level=10
 
-$ETCDCTL put /vitastor/config/inode/1/2 '{"name":"testimg@0"}'
-$ETCDCTL put /vitastor/config/inode/1/3 '{"parent_id":2,"name":"testimg"}'
+$ETCDCTL put /vitastor/config/inode/1/2 '{"name":"testimg@0","size":'$((32*1024*1024))'}'
+$ETCDCTL put /vitastor/config/inode/1/3 '{"parent_id":2,"name":"testimg","size":'$((32*1024*1024))'}'
 
 LD_PRELOAD=libasan.so.5 \
-    fio -thread -name=test -ioengine=build/src/libfio_vitastor.so -bs=4k -direct=1 -iodepth=1 -fsync=32 -buffer_pattern=0xdeadface -rw=randwrite -etcd=$ETCD_URL -pool=1 -inode=3 -size=32M -number_ios=1024
+    fio -thread -name=test -ioengine=build/src/libfio_vitastor.so -bs=4k -direct=1 -iodepth=1 -fsync=32 -buffer_pattern=0xdeadface \
+        -rw=randwrite -etcd=$ETCD_URL -image=testimg -number_ios=1024
 
 LD_PRELOAD=libasan.so.5 \
     fio -thread -name=test -ioengine=build/src/libfio_vitastor.so -bs=4M -direct=1 -iodepth=1 -rw=read -etcd=$ETCD_URL -pool=1 -inode=3 -size=32M
@@ -55,14 +59,14 @@ qemu-img convert -S 4096 -p \
     -O raw ./testdata/merged.bin
 
 qemu-img convert -S 4096 -p \
-    -f raw "vitastor:etcd_host=127.0.0.1\:$ETCD_PORT/v3:pool=1:inode=2:size=$((32*1024*1024))" \
+    -f raw "vitastor:etcd_host=127.0.0.1\:$ETCD_PORT/v3:image=testimg@0" \
     -O raw ./testdata/layer0.bin
 
-$ETCDCTL put /vitastor/config/inode/1/3 '{"name":"testimg"}'
+$ETCDCTL put /vitastor/config/inode/1/3 '{"name":"testimg","size":'$((32*1024*1024))'}'
 
 qemu-img convert -S 4096 -p \
-   -f raw "vitastor:etcd_host=127.0.0.1\:$ETCD_PORT/v3:pool=1:inode=3:size=$((32*1024*1024))" \
-   -O raw ./testdata/layer1.bin
+    -f raw "vitastor:etcd_host=127.0.0.1\:$ETCD_PORT/v3:image=testimg" \
+    -O raw ./testdata/layer1.bin
 
 node mon/merge.js ./testdata/layer0.bin ./testdata/layer1.bin ./testdata/check.bin