Ejemplo n.º 1
0
void nbd_client_close(BlockDriverState *bs)
{
    NbdClientSession *client = nbd_get_client_session(bs);
    struct nbd_request request = {
        .type = NBD_CMD_DISC,
        .from = 0,
        .len = 0
    };

    if (client->sock == -1) {
        return;
    }

    nbd_send_request(client->sock, &request);

    nbd_teardown_connection(bs);
}

int nbd_client_init(BlockDriverState *bs, int sock, const char *export,
                    Error **errp)
{
    NbdClientSession *client = nbd_get_client_session(bs);
    int ret;

    /* NBD handshake */
    logout("session init %s\n", export);
    qemu_set_block(sock);
    ret = nbd_receive_negotiate(sock, export,
                                &client->nbdflags, &client->size,
                                &client->blocksize, errp);
    if (ret < 0) {
        logout("Failed to negotiate with the NBD server\n");
        closesocket(sock);
        return ret;
    }

    qemu_co_mutex_init(&client->send_mutex);
    qemu_co_mutex_init(&client->free_sema);
    client->sock = sock;

    /* Now that we're connected, set the socket to be non-blocking and
     * kick the reply mechanism.  */
    qemu_set_nonblock(sock);
    nbd_client_attach_aio_context(bs, bdrv_get_aio_context(bs));

    logout("Established connection with NBD server\n");
    return 0;
}
Ejemplo n.º 2
0
int nbd_client_co_pwritev(BlockDriverState *bs, uint64_t offset,
                          uint64_t bytes, QEMUIOVector *qiov, int flags)
{
    NBDClientSession *client = nbd_get_client_session(bs);
    NBDRequest request = {
        .type = NBD_CMD_WRITE,
        .from = offset,
        .len = bytes,
    };
    NBDReply reply;
    ssize_t ret;

    if (flags & BDRV_REQ_FUA) {
        assert(client->nbdflags & NBD_FLAG_SEND_FUA);
        request.flags |= NBD_CMD_FLAG_FUA;
    }

    assert(bytes <= NBD_MAX_BUFFER_SIZE);

    ret = nbd_co_send_request(bs, &request, qiov);
    if (ret < 0) {
        reply.error = -ret;
    } else {
        nbd_co_receive_reply(client, &request, &reply, NULL);
    }
    nbd_coroutine_end(bs, &request);
    return -reply.error;
}
Ejemplo n.º 3
0
int nbd_client_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes)
{
    NBDClientSession *client = nbd_get_client_session(bs);
    NBDRequest request = {
        .type = NBD_CMD_TRIM,
        .from = offset,
        .len = bytes,
    };
    NBDReply reply;
    ssize_t ret;

    if (!(client->nbdflags & NBD_FLAG_SEND_TRIM)) {
        return 0;
    }

    ret = nbd_co_send_request(bs, &request, NULL);
    if (ret < 0) {
        reply.error = -ret;
    } else {
        nbd_co_receive_reply(client, &request, &reply, NULL);
    }
    nbd_coroutine_end(bs, &request);
    return -reply.error;

}
Ejemplo n.º 4
0
void nbd_client_attach_aio_context(BlockDriverState *bs,
                                   AioContext *new_context)
{
    NBDClientSession *client = nbd_get_client_session(bs);
    qio_channel_attach_aio_context(QIO_CHANNEL(client->ioc), new_context);
    aio_co_schedule(new_context, client->read_reply_co);
}
Ejemplo n.º 5
0
static int nbd_co_writev_1(BlockDriverState *bs, int64_t sector_num,
                           int nb_sectors, QEMUIOVector *qiov,
                           int offset)
{
    NbdClientSession *client = nbd_get_client_session(bs);
    struct nbd_request request = { .type = NBD_CMD_WRITE };
    struct nbd_reply reply;
    ssize_t ret;

    if (!bdrv_enable_write_cache(bs) &&
        (client->nbdflags & NBD_FLAG_SEND_FUA)) {
        request.type |= NBD_CMD_FLAG_FUA;
    }

    request.from = sector_num * 512;
    request.len = nb_sectors * 512;

    nbd_coroutine_start(client, &request);
    ret = nbd_co_send_request(bs, &request, qiov, offset);
    if (ret < 0) {
        reply.error = -ret;
    } else {
        nbd_co_receive_reply(client, &request, &reply, NULL, 0);
    }
    nbd_coroutine_end(client, &request);
    return -reply.error;
}
Ejemplo n.º 6
0
int nbd_client_co_flush(BlockDriverState *bs)
{
    NbdClientSession *client = nbd_get_client_session(bs);
    struct nbd_request request = { .type = NBD_CMD_FLUSH };
    struct nbd_reply reply;
    ssize_t ret;

    if (!(client->nbdflags & NBD_FLAG_SEND_FLUSH)) {
        return 0;
    }

    if (client->nbdflags & NBD_FLAG_SEND_FUA) {
        request.type |= NBD_CMD_FLAG_FUA;
    }

    request.from = 0;
    request.len = 0;

    nbd_coroutine_start(client, &request);
    ret = nbd_co_send_request(bs, &request, NULL, 0);
    if (ret < 0) {
        reply.error = -ret;
    } else {
        nbd_co_receive_reply(client, &request, &reply, NULL, 0);
    }
    nbd_coroutine_end(client, &request);
    return -reply.error;
}
Ejemplo n.º 7
0
int nbd_client_co_discard(BlockDriverState *bs, int64_t sector_num,
                          int nb_sectors)
{
    NbdClientSession *client = nbd_get_client_session(bs);
    struct nbd_request request = { .type = NBD_CMD_TRIM };
    struct nbd_reply reply;
    ssize_t ret;

    if (!(client->nbdflags & NBD_FLAG_SEND_TRIM)) {
        return 0;
    }
    request.from = sector_num * 512;
    request.len = nb_sectors * 512;

    nbd_coroutine_start(client, &request);
    ret = nbd_co_send_request(bs, &request, NULL, 0);
    if (ret < 0) {
        reply.error = -ret;
    } else {
        nbd_co_receive_reply(client, &request, &reply, NULL, 0);
    }
    nbd_coroutine_end(client, &request);
    return -reply.error;

}
Ejemplo n.º 8
0
int nbd_client_co_preadv(BlockDriverState *bs, uint64_t offset,
                         uint64_t bytes, QEMUIOVector *qiov, int flags)
{
    NbdClientSession *client = nbd_get_client_session(bs);
    struct nbd_request request = {
        .type = NBD_CMD_READ,
        .from = offset,
        .len = bytes,
    };
    struct nbd_reply reply;
    ssize_t ret;

    assert(bytes <= NBD_MAX_BUFFER_SIZE);
    assert(!flags);

    nbd_coroutine_start(client, &request);
    ret = nbd_co_send_request(bs, &request, NULL);
    if (ret < 0) {
        reply.error = -ret;
    } else {
        nbd_co_receive_reply(client, &request, &reply, qiov);
    }
    nbd_coroutine_end(client, &request);
    return -reply.error;
}
Ejemplo n.º 9
0
int nbd_client_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset,
                                int bytes, BdrvRequestFlags flags)
{
    ssize_t ret;
    NBDClientSession *client = nbd_get_client_session(bs);
    NBDRequest request = {
        .type = NBD_CMD_WRITE_ZEROES,
        .from = offset,
        .len = bytes,
    };
    NBDReply reply;

    if (!(client->nbdflags & NBD_FLAG_SEND_WRITE_ZEROES)) {
        return -ENOTSUP;
    }

    if (flags & BDRV_REQ_FUA) {
        assert(client->nbdflags & NBD_FLAG_SEND_FUA);
        request.flags |= NBD_CMD_FLAG_FUA;
    }
    if (!(flags & BDRV_REQ_MAY_UNMAP)) {
        request.flags |= NBD_CMD_FLAG_NO_HOLE;
    }

    ret = nbd_co_send_request(bs, &request, NULL);
    if (ret < 0) {
        reply.error = -ret;
    } else {
        nbd_co_receive_reply(client, &request, &reply, NULL);
    }
    nbd_coroutine_end(bs, &request);
    return -reply.error;
}
Ejemplo n.º 10
0
static void nbd_teardown_connection(BlockDriverState *bs)
{
    NbdClientSession *client = nbd_get_client_session(bs);

    /* finish any pending coroutines */
    shutdown(client->sock, 2);
    nbd_recv_coroutines_enter_all(client);

    nbd_client_detach_aio_context(bs);
    closesocket(client->sock);
    client->sock = -1;
}
Ejemplo n.º 11
0
static void nbd_recv_coroutines_enter_all(BlockDriverState *bs)
{
    NBDClientSession *s = nbd_get_client_session(bs);
    int i;

    for (i = 0; i < MAX_NBD_REQUESTS; i++) {
        if (s->recv_coroutine[i]) {
            qemu_coroutine_enter(s->recv_coroutine[i]);
        }
    }
    BDRV_POLL_WHILE(bs, s->read_reply_co);
}
Ejemplo n.º 12
0
void nbd_client_close(BlockDriverState *bs)
{
    NBDClientSession *client = nbd_get_client_session(bs);
    NBDRequest request = { .type = NBD_CMD_DISC };

    if (client->ioc == NULL) {
        return;
    }

    nbd_send_request(client->ioc, &request);

    nbd_teardown_connection(bs);
}
Ejemplo n.º 13
0
static int nbd_co_send_request(BlockDriverState *bs,
                               struct nbd_request *request,
                               QEMUIOVector *qiov, int offset)
{
    NbdClientSession *s = nbd_get_client_session(bs);
    AioContext *aio_context;
    int rc, ret, i;

    qemu_co_mutex_lock(&s->send_mutex);

    for (i = 0; i < MAX_NBD_REQUESTS; i++) {
        if (s->recv_coroutine[i] == NULL) {
            s->recv_coroutine[i] = qemu_coroutine_self();
            break;
        }
    }

    g_assert(qemu_in_coroutine());
    assert(i < MAX_NBD_REQUESTS);
    request->handle = INDEX_TO_HANDLE(s, i);

    if (!s->ioc) {
        qemu_co_mutex_unlock(&s->send_mutex);
        return -EPIPE;
    }

    s->send_coroutine = qemu_coroutine_self();
    aio_context = bdrv_get_aio_context(bs);

    aio_set_fd_handler(aio_context, s->sioc->fd, false,
                       nbd_reply_ready, nbd_restart_write, bs);
    if (qiov) {
        qio_channel_set_cork(s->ioc, true);
        rc = nbd_send_request(s->ioc, request);
        if (rc >= 0) {
            ret = nbd_wr_syncv(s->ioc, qiov->iov, qiov->niov,
                               offset, request->len, 0);
            if (ret != request->len) {
                rc = -EIO;
            }
        }
        qio_channel_set_cork(s->ioc, false);
    } else {
        rc = nbd_send_request(s->ioc, request);
    }
    aio_set_fd_handler(aio_context, s->sioc->fd, false,
                       nbd_reply_ready, NULL, bs);
    s->send_coroutine = NULL;
    qemu_co_mutex_unlock(&s->send_mutex);
    return rc;
}
Ejemplo n.º 14
0
static void nbd_coroutine_end(BlockDriverState *bs,
                              NBDRequest *request)
{
    NBDClientSession *s = nbd_get_client_session(bs);
    int i = HANDLE_TO_INDEX(s, request->handle);

    s->recv_coroutine[i] = NULL;
    s->in_flight--;
    qemu_co_queue_next(&s->free_sema);

    /* Kick the read_reply_co to get the next reply.  */
    if (s->read_reply_co) {
        aio_co_wake(s->read_reply_co);
    }
}
Ejemplo n.º 15
0
static int nbd_co_send_request(BlockDriverState *bs,
                               struct nbd_request *request,
                               QEMUIOVector *qiov, int offset)
{
    NbdClientSession *s = nbd_get_client_session(bs);
    AioContext *aio_context;
    int rc, ret, i;

    qemu_co_mutex_lock(&s->send_mutex);

    for (i = 0; i < MAX_NBD_REQUESTS; i++) {
        if (s->recv_coroutine[i] == NULL) {
            s->recv_coroutine[i] = qemu_coroutine_self();
            break;
        }
    }

    assert(i < MAX_NBD_REQUESTS);
    request->handle = INDEX_TO_HANDLE(s, i);
    s->send_coroutine = qemu_coroutine_self();
    aio_context = bdrv_get_aio_context(bs);

    aio_set_fd_handler(aio_context, s->sock, AIO_CLIENT_PROTOCOL,
                       nbd_reply_ready, nbd_restart_write, bs);
    if (qiov) {
        if (!s->is_unix) {
            socket_set_cork(s->sock, 1);
        }
        rc = nbd_send_request(s->sock, request);
        if (rc >= 0) {
            ret = qemu_co_sendv(s->sock, qiov->iov, qiov->niov,
                                offset, request->len);
            if (ret != request->len) {
                rc = -EIO;
            }
        }
        if (!s->is_unix) {
            socket_set_cork(s->sock, 0);
        }
    } else {
        rc = nbd_send_request(s->sock, request);
    }
    aio_set_fd_handler(aio_context, s->sock, AIO_CLIENT_PROTOCOL,
                       nbd_reply_ready, NULL, bs);
    s->send_coroutine = NULL;
    qemu_co_mutex_unlock(&s->send_mutex);
    return rc;
}
Ejemplo n.º 16
0
static int nbd_co_send_request(BlockDriverState *bs,
                               NBDRequest *request,
                               QEMUIOVector *qiov)
{
    NBDClientSession *s = nbd_get_client_session(bs);
    int rc, ret, i;

    qemu_co_mutex_lock(&s->send_mutex);
    while (s->in_flight == MAX_NBD_REQUESTS) {
        qemu_co_queue_wait(&s->free_sema, &s->send_mutex);
    }
    s->in_flight++;

    for (i = 0; i < MAX_NBD_REQUESTS; i++) {
        if (s->recv_coroutine[i] == NULL) {
            s->recv_coroutine[i] = qemu_coroutine_self();
            break;
        }
    }

    g_assert(qemu_in_coroutine());
    assert(i < MAX_NBD_REQUESTS);
    request->handle = INDEX_TO_HANDLE(s, i);

    if (!s->ioc) {
        qemu_co_mutex_unlock(&s->send_mutex);
        return -EPIPE;
    }

    if (qiov) {
        qio_channel_set_cork(s->ioc, true);
        rc = nbd_send_request(s->ioc, request);
        if (rc >= 0) {
            ret = nbd_rwv(s->ioc, qiov->iov, qiov->niov, request->len, false,
                          NULL);
            if (ret != request->len) {
                rc = -EIO;
            }
        }
        qio_channel_set_cork(s->ioc, false);
    } else {
        rc = nbd_send_request(s->ioc, request);
    }
    qemu_co_mutex_unlock(&s->send_mutex);
    return rc;
}
Ejemplo n.º 17
0
static void nbd_reply_ready(void *opaque)
{
    BlockDriverState *bs = opaque;
    NbdClientSession *s = nbd_get_client_session(bs);
    uint64_t i;
    int ret;

    if (!s->ioc) { /* Already closed */
        return;
    }

    if (s->reply.handle == 0) {
        /* No reply already in flight.  Fetch a header.  It is possible
         * that another thread has done the same thing in parallel, so
         * the socket is not readable anymore.
         */
        ret = nbd_receive_reply(s->ioc, &s->reply);
        if (ret == -EAGAIN) {
            return;
        }
        if (ret < 0) {
            s->reply.handle = 0;
            goto fail;
        }
    }

    /* There's no need for a mutex on the receive side, because the
     * handler acts as a synchronization point and ensures that only
     * one coroutine is called until the reply finishes.  */
    i = HANDLE_TO_INDEX(s, s->reply.handle);
    if (i >= MAX_NBD_REQUESTS) {
        goto fail;
    }

    if (s->recv_coroutine[i]) {
        qemu_coroutine_enter(s->recv_coroutine[i], NULL);
        return;
    }

fail:
    nbd_teardown_connection(bs);
}
Ejemplo n.º 18
0
static void nbd_teardown_connection(BlockDriverState *bs)
{
    NBDClientSession *client = nbd_get_client_session(bs);

    if (!client->ioc) { /* Already closed */
        return;
    }

    /* finish any pending coroutines */
    qio_channel_shutdown(client->ioc,
                         QIO_CHANNEL_SHUTDOWN_BOTH,
                         NULL);
    BDRV_POLL_WHILE(bs, client->read_reply_co);

    nbd_client_detach_aio_context(bs);
    object_unref(OBJECT(client->sioc));
    client->sioc = NULL;
    object_unref(OBJECT(client->ioc));
    client->ioc = NULL;
}
Ejemplo n.º 19
0
static int nbd_co_request(BlockDriverState *bs,
                          NBDRequest *request,
                          QEMUIOVector *qiov)
{
    NBDClientSession *client = nbd_get_client_session(bs);
    NBDReply reply;
    int ret;

    assert(!qiov || request->type == NBD_CMD_WRITE ||
           request->type == NBD_CMD_READ);
    ret = nbd_co_send_request(bs, request,
                              request->type == NBD_CMD_WRITE ? qiov : NULL);
    if (ret < 0) {
        reply.error = -ret;
    } else {
        nbd_co_receive_reply(client, request, &reply,
                             request->type == NBD_CMD_READ ? qiov : NULL);
    }
    return -reply.error;
}
Ejemplo n.º 20
0
static int nbd_co_readv_1(BlockDriverState *bs, int64_t sector_num,
                          int nb_sectors, QEMUIOVector *qiov,
                          int offset)
{
    NbdClientSession *client = nbd_get_client_session(bs);
    struct nbd_request request = { .type = NBD_CMD_READ };
    struct nbd_reply reply;
    ssize_t ret;

    request.from = sector_num * 512;
    request.len = nb_sectors * 512;

    nbd_coroutine_start(client, &request);
    ret = nbd_co_send_request(bs, &request, NULL, 0);
    if (ret < 0) {
        reply.error = -ret;
    } else {
        nbd_co_receive_reply(client, &request, &reply, qiov, offset);
    }
    nbd_coroutine_end(client, &request);
    return -reply.error;

}
Ejemplo n.º 21
0
static void nbd_restart_write(void *opaque)
{
    BlockDriverState *bs = opaque;

    qemu_coroutine_enter(nbd_get_client_session(bs)->send_coroutine, NULL);
}
Ejemplo n.º 22
0
void nbd_client_close(BlockDriverState *bs)
{
    NbdClientSession *client = nbd_get_client_session(bs);
    struct nbd_request request = {
        .type = NBD_CMD_DISC,
        .from = 0,
        .len = 0
    };

    if (client->ioc == NULL) {
        return;
    }

    nbd_send_request(client->ioc, &request);

    nbd_teardown_connection(bs);
}

int nbd_client_init(BlockDriverState *bs,
                    QIOChannelSocket *sioc,
                    const char *export,
                    QCryptoTLSCreds *tlscreds,
                    const char *hostname,
                    Error **errp)
{
    NbdClientSession *client = nbd_get_client_session(bs);
    int ret;

    /* NBD handshake */
    logout("session init %s\n", export);
    qio_channel_set_blocking(QIO_CHANNEL(sioc), true, NULL);

    ret = nbd_receive_negotiate(QIO_CHANNEL(sioc), export,
                                &client->nbdflags,
                                tlscreds, hostname,
                                &client->ioc,
                                &client->size, errp);
    if (ret < 0) {
        logout("Failed to negotiate with the NBD server\n");
        return ret;
    }

    qemu_co_mutex_init(&client->send_mutex);
    qemu_co_mutex_init(&client->free_sema);
    client->sioc = sioc;
    object_ref(OBJECT(client->sioc));

    if (!client->ioc) {
        client->ioc = QIO_CHANNEL(sioc);
        object_ref(OBJECT(client->ioc));
    }

    /* Now that we're connected, set the socket to be non-blocking and
     * kick the reply mechanism.  */
    qio_channel_set_blocking(QIO_CHANNEL(sioc), false, NULL);

    nbd_client_attach_aio_context(bs, bdrv_get_aio_context(bs));

    logout("Established connection with NBD server\n");
    return 0;
}
Ejemplo n.º 23
0
void nbd_client_attach_aio_context(BlockDriverState *bs,
                                   AioContext *new_context)
{
    aio_set_fd_handler(new_context, nbd_get_client_session(bs)->sock,
                       false, nbd_reply_ready, NULL, bs);
}
Ejemplo n.º 24
0
void nbd_client_detach_aio_context(BlockDriverState *bs)
{
    aio_set_fd_handler(bdrv_get_aio_context(bs),
                       nbd_get_client_session(bs)->sock,
                       false, NULL, NULL, NULL);
}
Ejemplo n.º 25
0
static int nbd_co_send_request(BlockDriverState *bs,
                               NBDRequest *request,
                               QEMUIOVector *qiov)
{
    NBDClientSession *s = nbd_get_client_session(bs);
    int rc, i;

    qemu_co_mutex_lock(&s->send_mutex);
    while (s->in_flight == MAX_NBD_REQUESTS) {
        qemu_co_queue_wait(&s->free_sema, &s->send_mutex);
    }
    s->in_flight++;

    for (i = 0; i < MAX_NBD_REQUESTS; i++) {
        if (s->requests[i].coroutine == NULL) {
            break;
        }
    }

    g_assert(qemu_in_coroutine());
    assert(i < MAX_NBD_REQUESTS);

    s->requests[i].coroutine = qemu_coroutine_self();
    s->requests[i].receiving = false;

    request->handle = INDEX_TO_HANDLE(s, i);

    if (s->quit) {
        rc = -EIO;
        goto err;
    }
    if (!s->ioc) {
        rc = -EPIPE;
        goto err;
    }

    if (qiov) {
        qio_channel_set_cork(s->ioc, true);
        rc = nbd_send_request(s->ioc, request);
        if (rc >= 0 && !s->quit) {
            assert(request->len == iov_size(qiov->iov, qiov->niov));
            if (qio_channel_writev_all(s->ioc, qiov->iov, qiov->niov,
                                       NULL) < 0) {
                rc = -EIO;
            }
        }
        qio_channel_set_cork(s->ioc, false);
    } else {
        rc = nbd_send_request(s->ioc, request);
    }

err:
    if (rc < 0) {
        s->quit = true;
        s->requests[i].coroutine = NULL;
        s->in_flight--;
        qemu_co_queue_next(&s->free_sema);
    }
    qemu_co_mutex_unlock(&s->send_mutex);
    return rc;
}
Ejemplo n.º 26
0
        return;
    }

    nbd_send_request(client->ioc, &request);

    nbd_teardown_connection(bs);
}

int nbd_client_init(BlockDriverState *bs,
                    QIOChannelSocket *sioc,
                    const char *export,
                    QCryptoTLSCreds *tlscreds,
                    const char *hostname,
                    Error **errp)
{
    NBDClientSession *client = nbd_get_client_session(bs);
    int ret;

    /* NBD handshake */
    logout("session init %s\n", export);
    qio_channel_set_blocking(QIO_CHANNEL(sioc), true, NULL);

    ret = nbd_receive_negotiate(QIO_CHANNEL(sioc), export,
                                &client->nbdflags,
                                tlscreds, hostname,
                                &client->ioc,
                                &client->size, errp);
    if (ret < 0) {
        logout("Failed to negotiate with the NBD server\n");
        return ret;
    }
Ejemplo n.º 27
0
void nbd_client_detach_aio_context(BlockDriverState *bs)
{
    NBDClientSession *client = nbd_get_client_session(bs);
    qio_channel_detach_aio_context(QIO_CHANNEL(client->ioc));
}