WIP node.js binding

node-binding/addon.cc

@@ -0,0 +1,77 @@
+#include "addon.h"
+
+// Initialize the node addon
+NAN_MODULE_INIT(InitAddon)
+{
+    // vitastor.Client
+
+    v8::Local<v8::FunctionTemplate> tpl = Nan::New<v8::FunctionTemplate>(NodeVitastor::Create);
+    tpl->SetClassName(Nan::New("Client").ToLocalChecked());
+    tpl->InstanceTemplate()->SetInternalFieldCount(1);
+
+    Nan::SetPrototypeMethod(tpl, "read", NodeVitastor::Read);
+    Nan::SetPrototypeMethod(tpl, "write", NodeVitastor::Write);
+    Nan::SetPrototypeMethod(tpl, "sync", NodeVitastor::Sync);
+    Nan::SetPrototypeMethod(tpl, "read_bitmap", NodeVitastor::ReadBitmap);
+    //Nan::SetPrototypeMethod(tpl, "destroy", NodeVitastor::Destroy);
+
+    Nan::Set(target, Nan::New("Client").ToLocalChecked(), Nan::GetFunction(tpl).ToLocalChecked());
+
+    // vitastor.Image (opened image)
+
+    tpl = Nan::New<v8::FunctionTemplate>(NodeVitastorImage::Create);
+    tpl->SetClassName(Nan::New("Image").ToLocalChecked());
+    tpl->InstanceTemplate()->SetInternalFieldCount(2);
+
+    Nan::SetPrototypeMethod(tpl, "read", NodeVitastorImage::Read);
+    Nan::SetPrototypeMethod(tpl, "write", NodeVitastorImage::Write);
+    Nan::SetPrototypeMethod(tpl, "sync", NodeVitastorImage::Sync);
+    Nan::SetPrototypeMethod(tpl, "get_info", NodeVitastorImage::GetInfo);
+    Nan::SetPrototypeMethod(tpl, "read_bitmap", NodeVitastorImage::ReadBitmap);
+
+    Nan::Set(target, Nan::New("Image").ToLocalChecked(), Nan::GetFunction(tpl).ToLocalChecked());
+
+    // vitastor.KV
+
+    tpl = Nan::New<v8::FunctionTemplate>(NodeVitastorKV::Create);
+    tpl->SetClassName(Nan::New("KV").ToLocalChecked());
+    tpl->InstanceTemplate()->SetInternalFieldCount(1);
+
+    Nan::SetPrototypeMethod(tpl, "open", NodeVitastorKV::Open);
+    Nan::SetPrototypeMethod(tpl, "set_config", NodeVitastorKV::SetConfig);
+    Nan::SetPrototypeMethod(tpl, "close", NodeVitastorKV::Close);
+    Nan::SetPrototypeMethod(tpl, "get_size", NodeVitastorKV::GetSize);
+    Nan::SetPrototypeMethod(tpl, "get", NodeVitastorKV::Get);
+    Nan::SetPrototypeMethod(tpl, "get_cached", NodeVitastorKV::GetCached);
+    Nan::SetPrototypeMethod(tpl, "set", NodeVitastorKV::Set);
+    Nan::SetPrototypeMethod(tpl, "del", NodeVitastorKV::Del);
+    Nan::SetPrototypeMethod(tpl, "list", NodeVitastorKV::List);
+
+    Nan::Set(target, Nan::New("KV").ToLocalChecked(), Nan::GetFunction(tpl).ToLocalChecked());
+
+    Nan::Set(target, Nan::New("ENOENT").ToLocalChecked(), Nan::New<v8::Int32>(-ENOENT));
+    Nan::Set(target, Nan::New("EIO").ToLocalChecked(), Nan::New<v8::Int32>(-EIO));
+    Nan::Set(target, Nan::New("EINVAL").ToLocalChecked(), Nan::New<v8::Int32>(-EINVAL));
+    Nan::Set(target, Nan::New("EROFS").ToLocalChecked(), Nan::New<v8::Int32>(-EROFS));
+    Nan::Set(target, Nan::New("ENOSPC").ToLocalChecked(), Nan::New<v8::Int32>(-ENOSPC));
+    Nan::Set(target, Nan::New("EINTR").ToLocalChecked(), Nan::New<v8::Int32>(-EINTR));
+    Nan::Set(target, Nan::New("EILSEQ").ToLocalChecked(), Nan::New<v8::Int32>(-EILSEQ));
+    Nan::Set(target, Nan::New("ENOTBLK").ToLocalChecked(), Nan::New<v8::Int32>(-ENOTBLK));
+    Nan::Set(target, Nan::New("ENOSYS").ToLocalChecked(), Nan::New<v8::Int32>(-ENOSYS));
+    Nan::Set(target, Nan::New("EAGAIN").ToLocalChecked(), Nan::New<v8::Int32>(-EAGAIN));
+
+    // Listing handle
+
+    tpl = Nan::New<v8::FunctionTemplate>(NodeVitastorKVListing::Create);
+    tpl->SetClassName(Nan::New("KVListing").ToLocalChecked());
+    tpl->InstanceTemplate()->SetInternalFieldCount(2);
+
+    Nan::SetPrototypeMethod(tpl, "next", NodeVitastorKVListing::Next);
+    Nan::SetPrototypeMethod(tpl, "close", NodeVitastorKVListing::Close);
+
+    Nan::Set(target, Nan::New("KVListing").ToLocalChecked(), Nan::GetFunction(tpl).ToLocalChecked());
+
+    NodeVitastorKV::listing_class.Reset(Nan::GetFunction(tpl).ToLocalChecked());
+}
+
+NODE_MODULE(addon, (void*)InitAddon)

node-binding/addon.h

@@ -0,0 +1,17 @@
+#ifndef NODE_VITASTOR_ADDON_H
+#define NODE_VITASTOR_ADDON_H
+
+#include <nan.h>
+#include <vitastor_c.h>
+
+#include "client.h"
+
+#define ERRORF(format, ...) fprintf(stderr, format "\n", __VA_ARGS__);
+
+#define TRACEF(format, ...) fprintf(stderr, format "\n", __VA_ARGS__);
+#define TRACE(msg) fprintf(stderr, "%s\n", msg);
+
+//#define TRACEF(format, arg) ;
+//#define TRACE(msg) ;
+
+#endif

node-binding/binding.gyp

@@ -0,0 +1,20 @@
+{
+  'targets': [
+    {
+      'target_name': 'addon',
+      'sources': [
+        'client.cc',
+        'addon.cc'
+      ],
+      'include_dirs': [
+        '<!(node -e "require(\'nan\')")'
+      ],
+      'cflags': [
+        '<!(pkg-config --cflags vitastor)'
+      ],
+      'libraries': [
+        '<!(pkg-config --libs vitastor)'
+      ]
+    }
+  ]
+}

node-binding/client.cc

@@ -0,0 +1,850 @@
+#include "addon.h"
+
+#define NODE_VITASTOR_READ 1
+#define NODE_VITASTOR_WRITE 2
+#define NODE_VITASTOR_SYNC 3
+#define NODE_VITASTOR_READ_BITMAP 4
+#define NODE_VITASTOR_GET_INFO 5
+
+#ifndef INODE_POOL
+#define INODE_POOL(inode) (uint32_t)((inode) >> (64 - POOL_ID_BITS))
+#define INODE_NO_POOL(inode) (uint64_t)((inode) & (((uint64_t)1 << (64-POOL_ID_BITS)) - 1))
+#define INODE_WITH_POOL(pool_id, inode) (((uint64_t)(pool_id) << (64-POOL_ID_BITS)) | INODE_NO_POOL(inode))
+#endif
+
+class NodeVitastorRequest: public Nan::AsyncResource
+{
+public:
+    NodeVitastorRequest(v8::Local<v8::Function> cb): Nan::AsyncResource("NodeVitastorRequest")
+    {
+        callback.Reset(cb);
+    }
+
+    iovec iov;
+    NodeVitastorImage *img = NULL;
+    int op = 0;
+    uint64_t offset = 0, len = 0, version = 0;
+    bool with_parents = false;
+    Nan::Persistent<v8::Function> callback;
+};
+
+//////////////////////////////////////////////////
+// NodeVitastor
+//////////////////////////////////////////////////
+
+NodeVitastor::NodeVitastor(): Nan::ObjectWrap()
+{
+    TRACE("NodeVitastor: constructor");
+    poll_watcher.data = this;
+}
+
+NodeVitastor::~NodeVitastor()
+{
+    uv_poll_stop(&poll_watcher);
+    vitastor_c_destroy(c);
+    c = NULL;
+}
+
+NAN_METHOD(NodeVitastor::Create)
+{
+    TRACE("NodeVitastor::Create");
+    v8::Local<v8::Object> jsParams = info[0].As<v8::Object>();
+    v8::Local<v8::Array> keys = Nan::GetOwnPropertyNames(jsParams).ToLocalChecked();
+    std::vector<std::string> cfg;
+    for (uint32_t i = 0; i < keys->Length(); i++)
+    {
+        auto key = Nan::Get(keys, i).ToLocalChecked();
+        cfg.push_back(std::string(*Nan::Utf8String(key)));
+        cfg.push_back(std::string(*Nan::Utf8String(Nan::Get(jsParams, key).ToLocalChecked())));
+    }
+
+    const char **c_cfg = new const char*[cfg.size()];
+    for (size_t i = 0; i < cfg.size(); i++)
+    {
+        c_cfg[i] = cfg[i].c_str();
+    }
+    NodeVitastor* cli = new NodeVitastor();
+    cli->c = vitastor_c_create_uring_json(c_cfg, cfg.size());
+    delete[] c_cfg;
+
+    int res = vitastor_c_uring_register_eventfd(cli->c);
+    if (res >= 0)
+    {
+        cli->eventfd = res;
+        res = uv_poll_init_socket(uv_default_loop(), &cli->poll_watcher, cli->eventfd);
+        if (res >= 0)
+            res = uv_poll_start(&cli->poll_watcher, UV_READABLE, on_io_readable);
+    }
+    if (res < 0)
+    {
+        ERRORF("NodeVitastor: failed to create and register io_uring eventfd in libuv: %s", strerror(-cli->eventfd));
+        vitastor_c_destroy(cli->c);
+        cli->c = NULL;
+        Nan::ThrowError("failed to create and register io_uring eventfd");
+        return;
+    }
+
+    cli->Wrap(info.This());
+    info.GetReturnValue().Set(info.This());
+}
+
+void NodeVitastor::on_io_readable(uv_poll_t* handle, int status, int revents)
+{
+    TRACEF("NodeVitastor::on_io_readable status/revents %d %d", status, revents);
+    if (revents & UV_READABLE)
+    {
+        NodeVitastor* self = (NodeVitastor*)handle->data;
+        std::unique_lock<std::mutex> lock(self->mu);
+        vitastor_c_uring_handle_events(self->c);
+    }
+}
+
+static NodeVitastorRequest* getReadRequest(const Nan::FunctionCallbackInfo<v8::Value> & info, int argpos)
+{
+    uint64_t offset = Nan::To<int64_t>(info[argpos+0]).FromJust();
+    uint64_t len = Nan::To<int64_t>(info[argpos+1]).FromJust();
+    uint8_t *buf = (uint8_t*)malloc(len);
+    if (!buf)
+    {
+        Nan::ThrowError("failed to allocate memory");
+        return NULL;
+    }
+    v8::Local<v8::Function> callback = info[argpos+2].As<v8::Function>();
+    auto req = new NodeVitastorRequest(callback);
+
+    req->offset = offset;
+    req->len = len;
+    req->iov = { .iov_base = buf, .iov_len = len };
+
+    return req;
+}
+
+// read(pool, inode, offset, len, callback(err, buffer, version))
+NAN_METHOD(NodeVitastor::Read)
+{
+    TRACE("NodeVitastor::Read");
+
+    NodeVitastor* self = Nan::ObjectWrap::Unwrap<NodeVitastor>(info.This());
+
+    uint64_t pool = Nan::To<int64_t>(info[0]).FromJust();
+    uint64_t inode = Nan::To<int64_t>(info[1]).FromJust();
+
+    auto req = getReadRequest(info, 2);
+
+    std::unique_lock<std::mutex> lock(self->mu);
+    vitastor_c_read(self->c, ((pool << (64-POOL_ID_BITS)) | inode), req->offset, req->len, &req->iov, 1, on_read_finish, req);
+}
+
+static NodeVitastorRequest* getWriteRequest(const Nan::FunctionCallbackInfo<v8::Value> & info, int argpos)
+{
+    uint64_t offset = Nan::To<int64_t>(info[argpos+0]).FromJust();
+    char *buf = node::Buffer::Data(info[argpos+1]);
+    uint64_t len = node::Buffer::Length(info[argpos+1]);
+    uint64_t version = 0;
+
+    if (!info[argpos+2].IsEmpty() && info[argpos+2]->IsObject())
+    {
+        auto key = Nan::New<v8::String>("version").ToLocalChecked();
+        auto params = info[argpos+2].As<v8::Object>();
+        auto versionObj = Nan::Get(params, key).ToLocalChecked();
+        if (!versionObj.IsEmpty())
+            version = Nan::To<int64_t>(versionObj).FromJust();
+        argpos++;
+    }
+
+    v8::Local<v8::Function> callback = info[argpos+2].As<v8::Function>();
+    auto req = new NodeVitastorRequest(callback);
+
+    req->offset = offset;
+    req->len = len;
+    req->version = version;
+    req->iov = { .iov_base = buf, .iov_len = req->len };
+
+    return req;
+}
+
+// write(pool, inode, offset, buffer, { version }?, callback(err))
+NAN_METHOD(NodeVitastor::Write)
+{
+    TRACE("NodeVitastor::Write");
+
+    NodeVitastor* self = Nan::ObjectWrap::Unwrap<NodeVitastor>(info.This());
+
+    uint64_t pool = Nan::To<int64_t>(info[0]).FromJust();
+    uint64_t inode = Nan::To<int64_t>(info[1]).FromJust();
+
+    auto req = getWriteRequest(info, 2);
+
+    std::unique_lock<std::mutex> lock(self->mu);
+    vitastor_c_write(self->c, ((pool << (64-POOL_ID_BITS)) | inode), req->offset, req->len, req->version, &req->iov, 1, on_write_finish, req);
+}
+
+// sync(callback(err))
+NAN_METHOD(NodeVitastor::Sync)
+{
+    TRACE("NodeVitastor::Sync");
+
+    NodeVitastor* self = Nan::ObjectWrap::Unwrap<NodeVitastor>(info.This());
+
+    v8::Local<v8::Function> callback = info[0].As<v8::Function>();
+    auto req = new NodeVitastorRequest(callback);
+
+    std::unique_lock<std::mutex> lock(self->mu);
+    vitastor_c_sync(self->c, on_write_finish, req);
+}
+
+// read_bitmap(pool, inode, offset, len, with_parents, callback(err, bitmap_buffer))
+NAN_METHOD(NodeVitastor::ReadBitmap)
+{
+    TRACE("NodeVitastor::ReadBitmap");
+
+    NodeVitastor* self = Nan::ObjectWrap::Unwrap<NodeVitastor>(info.This());
+
+    uint64_t pool = Nan::To<int64_t>(info[0]).FromJust();
+    uint64_t inode = Nan::To<int64_t>(info[1]).FromJust();
+    uint64_t offset = Nan::To<int64_t>(info[2]).FromJust();
+    uint64_t len = Nan::To<int64_t>(info[3]).FromJust();
+    bool with_parents = Nan::To<bool>(info[4]).FromJust();
+    v8::Local<v8::Function> callback = info[5].As<v8::Function>();
+
+    auto req = new NodeVitastorRequest(callback);
+    vitastor_c_read_bitmap(self->c, ((pool << (64-POOL_ID_BITS)) | inode), offset, len, with_parents, on_read_bitmap_finish, req);
+}
+
+static void on_error(NodeVitastorRequest *req, Nan::Callback & nanCallback, long retval)
+{
+    // Legal errors: EINVAL, EIO, EROFS, ENOSPC, EINTR, ENOENT
+    v8::Local<v8::Value> args[1];
+    if (!retval)
+        args[0] = Nan::Null();
+    else
+        args[0] = Nan::New<v8::Int32>((int32_t)retval);
+    nanCallback.Call(1, args, req);
+}
+
+void NodeVitastor::on_read_finish(void *opaque, long retval, uint64_t version)
+{
+    Nan::HandleScope scope;
+    NodeVitastorRequest *req = (NodeVitastorRequest *)opaque;
+    Nan::Callback nanCallback(Nan::New(req->callback));
+    if (retval == -ENOENT)
+    {
+        free(req->iov.iov_base);
+        nanCallback.Call(0, NULL, req);
+    }
+    else if (retval < 0)
+    {
+        free(req->iov.iov_base);
+        on_error(req, nanCallback, retval);
+    }
+    else
+    {
+        v8::Local<v8::Value> args[3];
+        args[0] = Nan::Null();
+        args[1] = Nan::NewBuffer((char*)req->iov.iov_base, req->iov.iov_len).ToLocalChecked();
+        args[2] = v8::BigInt::NewFromUnsigned(v8::Isolate::GetCurrent(), version);
+        nanCallback.Call(3, args, req);
+    }
+    delete req;
+}
+
+void NodeVitastor::on_write_finish(void *opaque, long retval)
+{
+    Nan::HandleScope scope;
+    NodeVitastorRequest *req = (NodeVitastorRequest *)opaque;
+    Nan::Callback nanCallback(Nan::New(req->callback));
+    on_error(req, nanCallback, retval);
+    delete req;
+}
+
+void NodeVitastor::on_read_bitmap_finish(void *opaque, long retval, uint8_t *bitmap)
+{
+    Nan::HandleScope scope;
+    NodeVitastorRequest *req = (NodeVitastorRequest *)opaque;
+    Nan::Callback nanCallback(Nan::New(req->callback));
+    if (retval == -ENOENT)
+        nanCallback.Call(0, NULL, req);
+    else if (retval < 0)
+        on_error(req, nanCallback, retval);
+    else
+    {
+        v8::Local<v8::Value> args[2];
+        args[0] = Nan::Null();
+        args[1] = Nan::NewBuffer((char*)bitmap, (retval+7)/8).ToLocalChecked();
+        nanCallback.Call(2, args, req);
+    }
+    delete req;
+}
+
+//NAN_METHOD(NodeVitastor::Destroy)
+//{
+//    TRACE("NodeVitastor::Destroy");
+//}
+
+//////////////////////////////////////////////////
+// NodeVitastorImage
+//////////////////////////////////////////////////
+
+NAN_METHOD(NodeVitastorImage::Create)
+{
+    TRACE("NodeVitastorImage::Create");
+
+    v8::Local<v8::Object> parent = info[0].As<v8::Object>();
+    std::string name = std::string(*Nan::Utf8String(info[1].As<v8::String>()));
+    NodeVitastor *cli = Nan::ObjectWrap::Unwrap<NodeVitastor>(parent);
+
+    NodeVitastorImage *img = new NodeVitastorImage();
+    img->cli = cli;
+    img->name = name;
+
+    img->Ref();
+    cli->Ref();
+    std::unique_lock<std::mutex> lock(cli->mu);
+    vitastor_c_watch_inode(cli->c, (char*)img->name.c_str(), on_watch_start, img);
+
+    img->Wrap(info.This());
+    info.GetReturnValue().Set(info.This());
+}
+
+NodeVitastorImage::~NodeVitastorImage()
+{
+    if (watch)
+    {
+        vitastor_c_close_watch(cli->c, watch);
+        watch = NULL;
+    }
+    cli->Unref();
+}
+
+// read(offset, len, callback(err, buffer, version))
+NAN_METHOD(NodeVitastorImage::Read)
+{
+    TRACE("NodeVitastorImage::Read");
+
+    NodeVitastorImage* img = Nan::ObjectWrap::Unwrap<NodeVitastorImage>(info.This());
+
+    auto req = getReadRequest(info, 0);
+    req->img = img;
+    req->op = NODE_VITASTOR_READ;
+
+    img->exec_or_wait(req);
+}
+
+// write(offset, buffer, { version }?, callback(err))
+NAN_METHOD(NodeVitastorImage::Write)
+{
+    TRACE("NodeVitastorImage::Write");
+
+    NodeVitastorImage* img = Nan::ObjectWrap::Unwrap<NodeVitastorImage>(info.This());
+
+    auto req = getWriteRequest(info, 0);
+    req->img = img;
+    req->op = NODE_VITASTOR_WRITE;
+
+    img->exec_or_wait(req);
+}
+
+NAN_METHOD(NodeVitastorImage::Sync)
+{
+    TRACE("NodeVitastorImage::Sync");
+
+    NodeVitastorImage* img = Nan::ObjectWrap::Unwrap<NodeVitastorImage>(info.This());
+
+    v8::Local<v8::Function> callback = info[0].As<v8::Function>();
+    auto req = new NodeVitastorRequest(callback);
+    req->img = img;
+    req->op = NODE_VITASTOR_SYNC;
+
+    img->exec_or_wait(req);
+}
+
+// read_bitmap(offset, len, with_parents, callback(err, bitmap_buffer))
+NAN_METHOD(NodeVitastorImage::ReadBitmap)
+{
+    TRACE("NodeVitastorImage::ReadBitmap");
+
+    NodeVitastorImage* img = Nan::ObjectWrap::Unwrap<NodeVitastorImage>(info.This());
+
+    uint64_t offset = Nan::To<int64_t>(info[0]).FromJust();
+    uint64_t len = Nan::To<int64_t>(info[1]).FromJust();
+    bool with_parents = Nan::To<bool>(info[2]).FromJust();
+    v8::Local<v8::Function> callback = info[3].As<v8::Function>();
+
+    auto req = new NodeVitastorRequest(callback);
+    req->img = img;
+    req->op = NODE_VITASTOR_READ_BITMAP;
+    req->offset = offset;
+    req->len = len;
+    req->with_parents = with_parents;
+
+    img->exec_or_wait(req);
+}
+
+NAN_METHOD(NodeVitastorImage::GetInfo)
+{
+    TRACE("NodeVitastorImage::Sync");
+
+    NodeVitastorImage* img = Nan::ObjectWrap::Unwrap<NodeVitastorImage>(info.This());
+
+    v8::Local<v8::Function> callback = info[0].As<v8::Function>();
+    auto req = new NodeVitastorRequest(callback);
+    req->img = img;
+    req->op = NODE_VITASTOR_GET_INFO;
+
+    img->exec_or_wait(req);
+}
+
+void NodeVitastorImage::exec_or_wait(NodeVitastorRequest *req)
+{
+    if (!watch)
+    {
+        // Need to wait for initialisation
+        on_init.push_back(req);
+    }
+    else
+    {
+        exec_request(req);
+    }
+}
+
+void NodeVitastorImage::exec_request(NodeVitastorRequest *req)
+{
+    std::unique_lock<std::mutex> lock(cli->mu);
+    if (req->op == NODE_VITASTOR_READ)
+    {
+        uint64_t ino = vitastor_c_inode_get_num(watch);
+        vitastor_c_read(cli->c, ino, req->offset, req->len, &req->iov, 1, NodeVitastor::on_read_finish, req);
+    }
+    else if (req->op == NODE_VITASTOR_WRITE)
+    {
+        uint64_t ino = vitastor_c_inode_get_num(watch);
+        vitastor_c_write(cli->c, ino, req->offset, req->len, req->version, &req->iov, 1, NodeVitastor::on_write_finish, req);
+    }
+    else if (req->op == NODE_VITASTOR_SYNC)
+    {
+        uint64_t ino = vitastor_c_inode_get_num(watch);
+        uint32_t imm = vitastor_c_inode_get_immediate_commit(cli->c, ino);
+        if (imm != IMMEDIATE_ALL)
+        {
+            vitastor_c_sync(cli->c, NodeVitastor::on_write_finish, req);
+        }
+        else
+        {
+            NodeVitastor::on_write_finish(req, 0);
+        }
+    }
+    else if (req->op == NODE_VITASTOR_READ_BITMAP)
+    {
+        uint64_t ino = vitastor_c_inode_get_num(watch);
+        vitastor_c_read_bitmap(cli->c, ino, req->offset, req->len, req->with_parents, NodeVitastor::on_read_bitmap_finish, req);
+    }
+    else if (req->op == NODE_VITASTOR_GET_INFO)
+    {
+        uint64_t size = vitastor_c_inode_get_size(watch);
+        uint64_t num = vitastor_c_inode_get_num(watch);
+        uint32_t block_size = vitastor_c_inode_get_block_size(cli->c, num);
+        uint32_t bitmap_granularity = vitastor_c_inode_get_bitmap_granularity(cli->c, num);
+        int readonly = vitastor_c_inode_get_readonly(watch);
+        uint32_t immediate_commit = vitastor_c_inode_get_immediate_commit(cli->c, num);
+        uint64_t parent_id = vitastor_c_inode_get_parent_id(watch);
+        char *meta = vitastor_c_inode_get_meta(watch);
+        uint64_t mod_revision = vitastor_c_inode_get_mod_revision(watch);
+
+        Nan::HandleScope scope;
+
+        v8::Local<v8::Object> res = Nan::New<v8::Object>();
+        Nan::Set(res, Nan::New<v8::String>("pool_id").ToLocalChecked(), Nan::New<v8::Number>(INODE_POOL(num)));
+        Nan::Set(res, Nan::New<v8::String>("inode_num").ToLocalChecked(), Nan::New<v8::Number>(INODE_NO_POOL(num)));
+        if (size < ((uint64_t)1<<53))
+            Nan::Set(res, Nan::New<v8::String>("size").ToLocalChecked(), Nan::New<v8::Number>(size));
+        else
+            Nan::Set(res, Nan::New<v8::String>("size").ToLocalChecked(), v8::BigInt::NewFromUnsigned(v8::Isolate::GetCurrent(), size));
+        if (parent_id)
+        {
+            Nan::Set(res, Nan::New<v8::String>("parent_pool_id").ToLocalChecked(), Nan::New<v8::Number>(INODE_POOL(parent_id)));
+            Nan::Set(res, Nan::New<v8::String>("parent_inode_num").ToLocalChecked(), Nan::New<v8::Number>(INODE_NO_POOL(parent_id)));
+        }
+        Nan::Set(res, Nan::New<v8::String>("readonly").ToLocalChecked(), Nan::New((bool)readonly));
+        if (meta)
+        {
+            Nan::JSON nanJSON;
+            Nan::Set(res, Nan::New<v8::String>("meta").ToLocalChecked(), nanJSON.Parse(Nan::New<v8::String>(meta).ToLocalChecked()).ToLocalChecked());
+        }
+        if (mod_revision < ((uint64_t)1<<53))
+            Nan::Set(res, Nan::New<v8::String>("mod_revision").ToLocalChecked(), Nan::New<v8::Number>(mod_revision));
+        else
+            Nan::Set(res, Nan::New<v8::String>("mod_revision").ToLocalChecked(), v8::BigInt::NewFromUnsigned(v8::Isolate::GetCurrent(), mod_revision));
+        Nan::Set(res, Nan::New<v8::String>("block_size").ToLocalChecked(), Nan::New(block_size));
+        Nan::Set(res, Nan::New<v8::String>("bitmap_granularity").ToLocalChecked(), Nan::New(bitmap_granularity));
+        Nan::Set(res, Nan::New<v8::String>("immediate_commit").ToLocalChecked(), Nan::New(immediate_commit));
+
+        Nan::Callback nanCallback(Nan::New(req->callback));
+        v8::Local<v8::Value> args[1];
+        args[0] = res;
+        nanCallback.Call(1, args, req);
+
+        delete req;
+    }
+}
+
+void NodeVitastorImage::on_watch_start(void *opaque, long retval)
+{
+    NodeVitastorImage *img = (NodeVitastorImage *)opaque;
+    {
+        img->watch = (void*)retval;
+        auto on_init = std::move(img->on_init);
+        for (auto req: on_init)
+        {
+            img->exec_request(req);
+        }
+    }
+    img->Unref();
+}
+
+//////////////////////////////////////////////////
+// NodeVitastorKV
+//////////////////////////////////////////////////
+
+// constructor(node_vitastor)
+NAN_METHOD(NodeVitastorKV::Create)
+{
+    TRACE("NodeVitastorKV::Create");
+
+    v8::Local<v8::Object> parent = info[0].As<v8::Object>();
+    NodeVitastor *cli = Nan::ObjectWrap::Unwrap<NodeVitastor>(parent);
+
+    NodeVitastorKV *kv = new NodeVitastorKV();
+    kv->cli = cli;
+    {
+        std::unique_lock<std::mutex> lock(cli->mu);
+        kv->dbw = new vitastorkv_dbw_t((cluster_client_t*)vitastor_c_get_internal_client(cli->c));
+    }
+
+    kv->Wrap(info.This());
+    info.GetReturnValue().Set(info.This());
+}
+
+NodeVitastorKV::~NodeVitastorKV()
+{
+    delete dbw;
+}
+
+// open(inode_id, { ...config }, callback(err))
+NAN_METHOD(NodeVitastorKV::Open)
+{
+    TRACE("NodeVitastorKV::Open");
+
+    NodeVitastorKV* kv = Nan::ObjectWrap::Unwrap<NodeVitastorKV>(info.This());
+
+    uint64_t inode_id = Nan::To<int64_t>(info[0]).FromJust();
+
+    v8::Local<v8::Object> jsParams = info[1].As<v8::Object>();
+    v8::Local<v8::Array> keys = Nan::GetOwnPropertyNames(jsParams).ToLocalChecked();
+    std::map<std::string, std::string> cfg;
+    for (uint32_t i = 0; i < keys->Length(); i++)
+    {
+        auto key = Nan::Get(keys, i).ToLocalChecked();
+        cfg[std::string(*Nan::Utf8String(key))] = std::string(*Nan::Utf8String(Nan::Get(jsParams, key).ToLocalChecked()));
+    }
+
+    v8::Local<v8::Function> callback = info[2].As<v8::Function>();
+    auto req = new NodeVitastorRequest(callback);
+
+    kv->Ref();
+    kv->dbw->open(inode_id, cfg, [kv, req](int res)
+    {
+        Nan::HandleScope scope;
+        Nan::Callback nanCallback(Nan::New(req->callback));
+        v8::Local<v8::Value> args[1];
+        args[0] = !res ? v8::Local<v8::Value>(Nan::Null()) : v8::Local<v8::Value>(Nan::New<v8::Int32>(res));
+        nanCallback.Call(1, args, req);
+        delete req;
+        kv->Unref();
+    });
+}
+
+// close(callback(err))
+NAN_METHOD(NodeVitastorKV::Close)
+{
+    TRACE("NodeVitastorKV::Close");
+
+    NodeVitastorKV* kv = Nan::ObjectWrap::Unwrap<NodeVitastorKV>(info.This());
+
+    v8::Local<v8::Function> callback = info[0].As<v8::Function>();
+    auto req = new NodeVitastorRequest(callback);
+
+    kv->Ref();
+    kv->dbw->close([kv, req]()
+    {
+        Nan::HandleScope scope;
+        Nan::Callback nanCallback(Nan::New(req->callback));
+        nanCallback.Call(0, NULL, req);
+        delete req;
+        kv->Unref();
+    });
+}
+
+// set_config({ ...config })
+NAN_METHOD(NodeVitastorKV::SetConfig)
+{
+    TRACE("NodeVitastorKV::SetConfig");
+
+    NodeVitastorKV* kv = Nan::ObjectWrap::Unwrap<NodeVitastorKV>(info.This());
+
+    v8::Local<v8::Object> jsParams = info[0].As<v8::Object>();
+    v8::Local<v8::Array> keys = Nan::GetOwnPropertyNames(jsParams).ToLocalChecked();
+    std::map<std::string, std::string> cfg;
+    for (uint32_t i = 0; i < keys->Length(); i++)
+    {
+        auto key = Nan::Get(keys, i).ToLocalChecked();
+        cfg[std::string(*Nan::Utf8String(key))] = std::string(*Nan::Utf8String(Nan::Get(jsParams, key).ToLocalChecked()));
+    }
+
+    kv->dbw->set_config(cfg);
+}
+
+// get_size()
+NAN_METHOD(NodeVitastorKV::GetSize)
+{
+    TRACE("NodeVitastorKV::GetSize");
+
+    NodeVitastorKV* kv = Nan::ObjectWrap::Unwrap<NodeVitastorKV>(info.This());
+
+    auto size = kv->dbw->get_size();
+    info.GetReturnValue().Set((size < ((uint64_t)1<<53))
+        ? v8::Local<v8::Value>(Nan::New<v8::Number>(size))
+        : v8::Local<v8::Value>(v8::BigInt::NewFromUnsigned(info.GetIsolate(), size)));
+}
+
+void NodeVitastorKV::get_impl(const Nan::FunctionCallbackInfo<v8::Value> & info, bool allow_cache)
+{
+    NodeVitastorKV* kv = Nan::ObjectWrap::Unwrap<NodeVitastorKV>(info.This());
+
+    // FIXME: Handle Buffer too
+    std::string key(*Nan::Utf8String(info[0].As<v8::String>()));
+
+    v8::Local<v8::Function> callback = info[1].As<v8::Function>();
+    auto req = new NodeVitastorRequest(callback);
+
+    kv->Ref();
+    kv->dbw->get(key, [kv, req](int res, const std::string & value)
+    {
+        Nan::HandleScope scope;
+        Nan::Callback nanCallback(Nan::New(req->callback));
+        v8::Local<v8::Value> args[2];
+        args[0] = !res ? v8::Local<v8::Value>(Nan::Null()) : v8::Local<v8::Value>(Nan::New<v8::Int32>(res));
+        args[1] = !res ? v8::Local<v8::Value>(Nan::New<v8::String>(value).ToLocalChecked()) : v8::Local<v8::Value>(Nan::Null());
+        nanCallback.Call(2, args, req);
+        delete req;
+        kv->Unref();
+    }, allow_cache);
+}
+
+// get(key, callback(err, value))
+NAN_METHOD(NodeVitastorKV::Get)
+{
+    TRACE("NodeVitastorKV::Get");
+    get_impl(info, false);
+}
+
+// get_cached(key, callback(err, value))
+NAN_METHOD(NodeVitastorKV::GetCached)
+{
+    TRACE("NodeVitastorKV::GetCached");
+    get_impl(info, true);
+}
+
+static std::function<bool(int, const std::string &)> make_cas_callback(NodeVitastorRequest *cas_req)
+{
+    return [cas_req](int res, const std::string & value)
+    {
+        Nan::HandleScope scope;
+        Nan::Callback nanCallback(Nan::New(cas_req->callback));
+        v8::Local<v8::Value> args[1];
+        args[0] = !res ? v8::Local<v8::Value>(Nan::New<v8::String>(value).ToLocalChecked()) : v8::Local<v8::Value>(Nan::Null());
+        Nan::MaybeLocal<v8::Value> ret = nanCallback.Call(1, args, cas_req);
+        if (ret.IsEmpty())
+            return false;
+        return Nan::To<bool>(ret.ToLocalChecked()).FromJust();
+    };
+}
+
+// set(key, value, callback(err), cas_compare(old_value))
+NAN_METHOD(NodeVitastorKV::Set)
+{
+    TRACE("NodeVitastorKV::Set");
+
+    NodeVitastorKV* kv = Nan::ObjectWrap::Unwrap<NodeVitastorKV>(info.This());
+
+    // FIXME: Handle Buffer too
+    std::string key(*Nan::Utf8String(info[0].As<v8::String>()));
+    std::string value(*Nan::Utf8String(info[1].As<v8::String>()));
+
+    v8::Local<v8::Function> callback = info[2].As<v8::Function>();
+    NodeVitastorRequest *req = new NodeVitastorRequest(callback), *cas_req = NULL;
+
+    std::function<bool(int, const std::string &)> cas_cb;
+    if (info.Length() > 3 && info[3]->IsObject())
+    {
+        v8::Local<v8::Function> cas_callback = info[3].As<v8::Function>();
+        cas_req = new NodeVitastorRequest(cas_callback);
+        cas_cb = make_cas_callback(cas_req);
+    }
+
+    kv->Ref();
+    kv->dbw->set(key, value, [kv, req, cas_req](int res)
+    {
+        Nan::HandleScope scope;
+        Nan::Callback nanCallback(Nan::New(req->callback));
+        v8::Local<v8::Value> args[1];
+        args[0] = !res ? v8::Local<v8::Value>(Nan::Null()) : v8::Local<v8::Value>(Nan::New<v8::Int32>(res));
+        nanCallback.Call(1, args, req);
+        delete req;
+        if (cas_req)
+            delete cas_req;
+        kv->Unref();
+    }, cas_cb);
+}
+
+// del(key, callback(err), cas_compare(old_value))
+NAN_METHOD(NodeVitastorKV::Del)
+{
+    TRACE("NodeVitastorKV::Del");
+
+    NodeVitastorKV* kv = Nan::ObjectWrap::Unwrap<NodeVitastorKV>(info.This());
+
+    // FIXME: Handle Buffer too
+    std::string key(*Nan::Utf8String(info[0].As<v8::String>()));
+
+    v8::Local<v8::Function> callback = info[1].As<v8::Function>();
+    NodeVitastorRequest *req = new NodeVitastorRequest(callback), *cas_req = NULL;
+
+    std::function<bool(int, const std::string &)> cas_cb;
+    if (info.Length() > 2 && info[2]->IsObject())
+    {
+        v8::Local<v8::Function> cas_callback = info[2].As<v8::Function>();
+        cas_req = new NodeVitastorRequest(cas_callback);
+        cas_cb = make_cas_callback(cas_req);
+    }
+
+    kv->Ref();
+    kv->dbw->del(key, [kv, req, cas_req](int res)
+    {
+        Nan::HandleScope scope;
+        Nan::Callback nanCallback(Nan::New(req->callback));
+        v8::Local<v8::Value> args[1];
+        args[0] = !res ? v8::Local<v8::Value>(Nan::Null()) : v8::Local<v8::Value>(Nan::New<v8::Int32>(res));
+        nanCallback.Call(1, args, req);
+        delete req;
+        if (cas_req)
+            delete cas_req;
+        kv->Unref();
+    }, cas_cb);
+}
+
+// list(start_key?)
+NAN_METHOD(NodeVitastorKV::List)
+{
+    TRACE("NodeVitastorKV::List");
+
+    v8::Local<v8::Function> cons = Nan::New(listing_class);
+    v8::Local<v8::Value> args[2];
+    args[0] = info.This();
+    int narg = 1;
+    if (info.Length() > 1 && info[1]->IsString())
+    {
+        args[1] = info[1];
+        narg = 2;
+    }
+    info.GetReturnValue().Set(Nan::NewInstance(cons, narg, args).ToLocalChecked());
+}
+
+//////////////////////////////////////////////////
+// NodeVitastorKVListing
+//////////////////////////////////////////////////
+
+// constructor(node_vitastor_kv, start_key?)
+NAN_METHOD(NodeVitastorKVListing::Create)
+{
+    TRACE("NodeVitastorKVListing::Create");
+
+    v8::Local<v8::Object> parent = info[0].As<v8::Object>();
+    NodeVitastorKV *kv = Nan::ObjectWrap::Unwrap<NodeVitastorKV>(parent);
+
+    std::string start_key;
+    // FIXME: Handle Buffer too
+    if (info.Length() > 1 && info[1]->IsString())
+    {
+        start_key = std::string(*Nan::Utf8String(info[1].As<v8::String>()));
+    }
+
+    NodeVitastorKVListing *list = new NodeVitastorKVListing();
+    list->kv = kv;
+    {
+        std::unique_lock<std::mutex> lock(kv->cli->mu);
+        list->handle = list->kv->dbw->list_start(start_key);
+    }
+
+    list->Wrap(info.This());
+    info.GetReturnValue().Set(info.This());
+}
+
+NodeVitastorKVListing::~NodeVitastorKVListing()
+{
+    if (handle)
+    {
+        std::unique_lock<std::mutex> lock(kv->cli->mu);
+        kv->dbw->list_close(handle);
+        handle = NULL;
+    }
+}
+
+// next(callback(err, value))
+NAN_METHOD(NodeVitastorKVListing::Next)
+{
+    TRACE("NodeVitastorKVListing::Next");
+
+    NodeVitastorKVListing* list = Nan::ObjectWrap::Unwrap<NodeVitastorKVListing>(info.This());
+
+    v8::Local<v8::Function> callback = info[0].As<v8::Function>();
+    auto req = new NodeVitastorRequest(callback);
+    if (!list->handle)
+    {
+        // Already closed
+        Nan::Callback nanCallback(Nan::New(req->callback));
+        v8::Local<v8::Value> args[1];
+        args[0] = Nan::New<v8::Int32>(-EINVAL);
+        nanCallback.Call(1, args, req);
+        delete req;
+        return;
+    }
+
+    list->kv->Ref();
+    list->kv->dbw->list_next(list->handle, [list, req](int res, const std::string & key, const std::string & value)
+    {
+        Nan::HandleScope scope;
+        Nan::Callback nanCallback(Nan::New(req->callback));
+        v8::Local<v8::Value> args[3];
+        args[0] = Nan::New<v8::Int32>(res);
+        args[1] = !res ? v8::Local<v8::Value>(Nan::New<v8::String>(key).ToLocalChecked()) : v8::Local<v8::Value>(Nan::Null());
+        args[2] = !res ? v8::Local<v8::Value>(Nan::New<v8::String>(value).ToLocalChecked()) : v8::Local<v8::Value>(Nan::Null());
+        nanCallback.Call(3, args, req);
+        delete req;
+        list->kv->Unref();
+    });
+}
+
+// close()
+NAN_METHOD(NodeVitastorKVListing::Close)
+{
+    TRACE("NodeVitastorKVListing::Close");
+
+    NodeVitastorKVListing* list = Nan::ObjectWrap::Unwrap<NodeVitastorKVListing>(info.This());
+
+    if (list->handle)
+    {
+        std::unique_lock<std::mutex> lock(list->kv->cli->mu);
+        list->kv->dbw->list_close(list->handle);
+        list->handle = NULL;
+    }
+}

node-binding/client.h

@@ -0,0 +1,139 @@
+#ifndef NODE_VITASTOR_CLIENT_H
+#define NODE_VITASTOR_CLIENT_H
+
+#include <mutex>
+
+#include <nan.h>
+#include <vitastor_c.h>
+#include <vitastor_kv.h>
+
+class NodeVitastorRequest;
+
+class NodeVitastor: public Nan::ObjectWrap
+{
+public:
+    // constructor({ ...config })
+    static NAN_METHOD(Create);
+    // read(pool, inode, offset, len, callback(err, buffer, version))
+    static NAN_METHOD(Read);
+    // write(pool, inode, offset, buffer, { version }?, callback(err))
+    static NAN_METHOD(Write);
+    // sync(callback(err))
+    static NAN_METHOD(Sync);
+    // read_bitmap(pool, inode, offset, len, with_parents, callback(err, bitmap_buffer))
+    static NAN_METHOD(ReadBitmap);
+//    // destroy()
+//    static NAN_METHOD(Destroy);
+
+    ~NodeVitastor();
+
+private:
+    vitastor_c *c = NULL;
+    int eventfd = -1;
+    uv_poll_t poll_watcher;
+    // FIXME: Is it really needed?
+    std::mutex mu;
+
+    NodeVitastor();
+
+    static void on_io_readable(uv_poll_t* handle, int status, int revents);
+    static void on_read_finish(void *opaque, long retval, uint64_t version);
+    static void on_write_finish(void *opaque, long retval);
+    static void on_read_bitmap_finish(void *opaque, long retval, uint8_t *bitmap);
+
+    friend class NodeVitastorImage;
+    friend class NodeVitastorKV;
+    friend class NodeVitastorKVListing;
+};
+
+class NodeVitastorImage: public Nan::ObjectWrap
+{
+public:
+    // constructor(node_vitastor, name)
+    static NAN_METHOD(Create);
+    // read(offset, len, callback(err, buffer, version))
+    static NAN_METHOD(Read);
+    // write(offset, buffer, { version }?, callback(err))
+    static NAN_METHOD(Write);
+    // sync(callback(err))
+    static NAN_METHOD(Sync);
+    // read_bitmap(offset, len, with_parents, callback(err, bitmap_buffer))
+    static NAN_METHOD(ReadBitmap);
+    // get_info(callback({ num, name, size, parent_id?, readonly?, meta?, mod_revision, block_size, bitmap_granularity, immediate_commit }))
+    static NAN_METHOD(GetInfo);
+
+    ~NodeVitastorImage();
+
+private:
+    NodeVitastor *cli = NULL;
+    std::string name;
+    void *watch = NULL;
+    std::vector<NodeVitastorRequest*> on_init;
+    Nan::Persistent<v8::Object> cliObj;
+
+    NodeVitastorImage();
+
+    static void on_watch_start(void *opaque, long retval);
+    void exec_request(NodeVitastorRequest *req);
+    void exec_or_wait(NodeVitastorRequest *req);
+};
+
+class NodeVitastorKV: public Nan::ObjectWrap
+{
+public:
+    // constructor(node_vitastor)
+    static NAN_METHOD(Create);
+    // open(inode_id, { ...config }, callback(err))
+    static NAN_METHOD(Open);
+    // set_config({ ...config })
+    static NAN_METHOD(SetConfig);
+    // close(callback())
+    static NAN_METHOD(Close);
+    // get_size()
+    static NAN_METHOD(GetSize);
+    // get(key, callback(err, value))
+    static NAN_METHOD(Get);
+    // get_cached(key, callback(err, value))
+    static NAN_METHOD(GetCached);
+    // set(key, value, callback(err), cas_compare(old_value))
+    static NAN_METHOD(Set);
+    // del(key, callback(err), cas_compare(old_value))
+    static NAN_METHOD(Del);
+    // list(start_key?)
+    static NAN_METHOD(List);
+
+    ~NodeVitastorKV();
+
+    static Nan::Persistent<v8::Function> listing_class;
+
+private:
+    NodeVitastor *cli = NULL;
+    vitastorkv_dbw_t *dbw = NULL;
+
+    NodeVitastorKV();
+
+    static void get_impl(const Nan::FunctionCallbackInfo<v8::Value> & info, bool allow_cache);
+
+    friend class NodeVitastorKVListing;
+};
+
+class NodeVitastorKVListing: public Nan::ObjectWrap
+{
+public:
+    // constructor(node_vitastor_kv, start_key?)
+    static NAN_METHOD(Create);
+    // next(callback(err, value))
+    static NAN_METHOD(Next);
+    // close()
+    static NAN_METHOD(Close);
+
+    ~NodeVitastorKVListing();
+
+private:
+    NodeVitastorKV *kv = NULL;
+    void *handle = NULL;
+
+    NodeVitastorKVListing();
+};
+
+#endif

node-binding/package.json

@@ -0,0 +1,24 @@
+{
+  "name": "vitastor",
+  "version": "1.7.0",
+  "description": "Low-level native bindings to Vitastor client library",
+  "main": "index.js",
+  "keywords": [
+    "storage",
+    "sds",
+    "vitastor"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "git://git.yourcmc.ru/vitalif/vitastor.git"
+  },
+  "scripts": {
+    "build": "node-gyp rebuild"
+  },
+  "author": "Vitaliy Filippov",
+  "license": "GPL-2.0-or-later",
+  "dependencies": {
+    "bindings": "1.5.0",
+    "nan": "^2.19.0"
+  }
+}

src/client/vitastor_c.cpp

@@ -384,6 +384,28 @@ int vitastor_c_inode_get_readonly(void *handle)
     return watch->cfg.readonly;
 }
 
+uint64_t vitastor_c_inode_get_parent_id(void *handle)
+{
+    inode_watch_t *watch = (inode_watch_t*)handle;
+    return watch->cfg.parent_id;
+}
+
+char* vitastor_c_inode_get_meta(void *handle)
+{
+    inode_watch_t *watch = (inode_watch_t*)handle;
+    if (watch->cfg.meta.is_null())
+    {
+        return NULL;
+    }
+    return strdup(watch->cfg.meta.dump().c_str());
+}
+
+uint64_t vitastor_c_inode_get_mod_revision(void *handle)
+{
+    inode_watch_t *watch = (inode_watch_t*)handle;
+    return watch->cfg.mod_revision;
+}
+
 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));

src/client/vitastor_c.h

@@ -69,6 +69,9 @@ void vitastor_c_watch_inode(vitastor_c *client, char *image, VitastorIOHandler c
 void vitastor_c_close_watch(vitastor_c *client, void *handle);
 uint64_t vitastor_c_inode_get_size(void *handle);
 uint64_t vitastor_c_inode_get_num(void *handle);
+uint64_t vitastor_c_inode_get_parent_id(void *handle);
+char* vitastor_c_inode_get_meta(void *handle);
+uint64_t vitastor_c_inode_get_mod_revision(void *handle);
 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);
 int vitastor_c_inode_get_readonly(void *handle);

src/kv/kv_cli.cpp

@@ -25,7 +25,7 @@ public:
     std::map<std::string, std::string> cfg;
     std::vector<std::string> cli_cmd;
 
-    kv_dbw_t *db = NULL;
+    vitastorkv_dbw_t *db = NULL;
     ring_loop_t *ringloop = NULL;
     epoll_manager_t *epmgr = NULL;
     cluster_client_t *cli = NULL;
@@ -144,7 +144,7 @@ void kv_cli_t::run()
     ringloop = new ring_loop_t(512);
     epmgr = new epoll_manager_t(ringloop);
     cli = new cluster_client_t(ringloop, epmgr->tfd, cfg);
-    db = new kv_dbw_t(cli);
+    db = new vitastorkv_dbw_t(cli);
     // Load image metadata
     while (!cli->is_ready())
     {
@@ -289,7 +289,7 @@ void kv_cli_t::next_cmd()
 
 struct kv_cli_list_t
 {
-    kv_dbw_t *db = NULL;
+    vitastorkv_dbw_t *db = NULL;
     void *handle = NULL;
     int format = 0;
     int n = 0;

src/kv/kv_db.cpp

@@ -501,7 +501,7 @@ void kv_block_t::dump(int base_level)
 
 void kv_db_t::open(inode_t inode_id, json11::Json cfg, std::function<void(int)> cb)
 {
-    if (block_cache.size() > 0)
+    if (block_cache.size() > 0 || inode_id)
     {
         cb(-EINVAL);
         return;
@@ -1958,38 +1958,38 @@ void kv_op_t::next_go_up()
     }
 }
 
-kv_dbw_t::kv_dbw_t(cluster_client_t *cli)
+vitastorkv_dbw_t::vitastorkv_dbw_t(cluster_client_t *cli)
 {
     db = new kv_db_t();
     db->cli = cli;
 }
 
-kv_dbw_t::~kv_dbw_t()
+vitastorkv_dbw_t::~vitastorkv_dbw_t()
 {
     delete db;
 }
 
-void kv_dbw_t::open(uint64_t inode_id, std::map<std::string, std::string> cfg, std::function<void(int)> cb)
+void vitastorkv_dbw_t::open(uint64_t inode_id, std::map<std::string, std::string> cfg, std::function<void(int)> cb)
 {
     db->open(inode_id, cfg, cb);
 }
 
-void kv_dbw_t::set_config(std::map<std::string, std::string> cfg)
+void vitastorkv_dbw_t::set_config(std::map<std::string, std::string> cfg)
 {
     db->set_config(cfg);
 }
 
-uint64_t kv_dbw_t::get_size()
+uint64_t vitastorkv_dbw_t::get_size()
 {
     return db->next_free;
 }
 
-void kv_dbw_t::close(std::function<void()> cb)
+void vitastorkv_dbw_t::close(std::function<void()> cb)
 {
     db->close(cb);
 }
 
-void kv_dbw_t::get(const std::string & key, std::function<void(int res, const std::string & value)> cb, bool cached)
+void vitastorkv_dbw_t::get(const std::string & key, std::function<void(int res, const std::string & value)> cb, bool cached)
 {
     auto *op = new kv_op_t;
     op->db = db;
@@ -2003,7 +2003,7 @@ void kv_dbw_t::get(const std::string & key, std::function<void(int res, const st
     op->exec();
 }
 
-void kv_dbw_t::set(const std::string & key, const std::string & value, std::function<void(int res)> cb,
+void vitastorkv_dbw_t::set(const std::string & key, const std::string & value, std::function<void(int res)> cb,
     std::function<bool(int res, const std::string & value)> cas_compare)
 {
     auto *op = new kv_op_t;
@@ -2023,7 +2023,7 @@ void kv_dbw_t::set(const std::string & key, const std::string & value, std::func
     op->exec();
 }
 
-void kv_dbw_t::del(const std::string & key, std::function<void(int res)> cb,
+void vitastorkv_dbw_t::del(const std::string & key, std::function<void(int res)> cb,
     std::function<bool(int res, const std::string & value)> cas_compare)
 {
     auto *op = new kv_op_t;
@@ -2042,7 +2042,7 @@ void kv_dbw_t::del(const std::string & key, std::function<void(int res)> cb,
     op->exec();
 }
 
-void* kv_dbw_t::list_start(const std::string & start)
+void* vitastorkv_dbw_t::list_start(const std::string & start)
 {
     if (!db->inode_id || db->closing)
         return NULL;
@@ -2055,7 +2055,7 @@ void* kv_dbw_t::list_start(const std::string & start)
     return op;
 }
 
-void kv_dbw_t::list_next(void *handle, std::function<void(int res, const std::string & key, const std::string & value)> cb)
+void vitastorkv_dbw_t::list_next(void *handle, std::function<void(int res, const std::string & key, const std::string & value)> cb)
 {
     kv_op_t *op = (kv_op_t*)handle;
     if (cb)
@@ -2068,7 +2068,7 @@ void kv_dbw_t::list_next(void *handle, std::function<void(int res, const std::st
     op->next();
 }
 
-void kv_dbw_t::list_close(void *handle)
+void vitastorkv_dbw_t::list_close(void *handle)
 {
     kv_op_t *op = (kv_op_t*)handle;
     delete op;

src/kv/kv_stress.cpp

@@ -73,7 +73,7 @@ public:
     timespec prev_stat_time, start_stat_time;
 
     // State
-    kv_dbw_t *db = NULL;
+    vitastorkv_dbw_t *db = NULL;
     ring_loop_t *ringloop = NULL;
     epoll_manager_t *epmgr = NULL;
     cluster_client_t *cli = NULL;
@@ -272,7 +272,7 @@ void kv_test_t::run(json11::Json cfg)
     ringloop = new ring_loop_t(512);
     epmgr = new epoll_manager_t(ringloop);
     cli = new cluster_client_t(ringloop, epmgr->tfd, cfg);
-    db = new kv_dbw_t(cli);
+    db = new vitastorkv_dbw_t(cli);
     // Load image metadata
     while (!cli->is_ready())
     {

src/kv/vitastor_kv.h

@@ -19,11 +19,11 @@ class cluster_client_t;
 
 struct kv_db_t;
 
-struct kv_dbw_t
+struct vitastorkv_dbw_t
 {
     // cli = vitastor_c_get_internal_client(client)
-    kv_dbw_t(cluster_client_t *cli);
-    ~kv_dbw_t();
+    vitastorkv_dbw_t(cluster_client_t *cli);
+    ~vitastorkv_dbw_t();
 
     void open(uint64_t inode_id, std::map<std::string, std::string> cfg, std::function<void(int)> cb);
     void set_config(std::map<std::string, std::string> cfg);

src/nfs/nfs_kv.cpp

@@ -255,7 +255,7 @@ void kv_fs_state_t::init(nfs_proxy_t *proxy, json11::Json cfg)
     // Open DB and wait
     int open_res = 0;
     bool open_done = false;
-    proxy->db = new kv_dbw_t(proxy->cli);
+    proxy->db = new vitastorkv_dbw_t(proxy->cli);
     std::map<std::string, std::string> kv_cfg;
     for (auto & kv: cfg.object_items())
     {

src/nfs/nfs_proxy.h

@@ -51,7 +51,7 @@ public:
     epoll_manager_t *epmgr = NULL;
     cluster_client_t *cli = NULL;
     cli_tool_t *cmd = NULL;
-    kv_dbw_t *db = NULL;
+    vitastorkv_dbw_t *db = NULL;
     kv_fs_state_t *kvfs = NULL;
     block_fs_state_t *blockfs = NULL;