block: introduce BlockDriver.bdrv_needs_filename to enable some drivers.

[qemu.git] / block / rbd.c

diff --git a/block/rbd.c b/block/rbd.c
index cb71751218298cc0dcba4e48cc5f1d10893b597e..f6d32371796f8c7e2636421b51d1a830747c5006 100644 (file)
--- a/block/rbd.c
+++ b/block/rbd.c
@@ -100,7 +100,6 @@ typedef struct BDRVRBDState {
     rados_ioctx_t io_ctx;
     rbd_image_t image;
     char name[RBD_MAX_IMAGE_NAME_SIZE];
-    int qemu_aio_count;
     char *snap;
     int event_reader_pos;
     RADOSCB *event_rcb;
@@ -288,7 +287,8 @@ static int qemu_rbd_set_conf(rados_t cluster, const char *conf)
     return ret;
 }
 
-static int qemu_rbd_create(const char *filename, QEMUOptionParameter *options)
+static int qemu_rbd_create(const char *filename, QEMUOptionParameter *options,
+                           Error **errp)
 {
     int64_t bytes = 0;
     int64_t objsize;
@@ -428,19 +428,11 @@ static void qemu_rbd_aio_event_reader(void *opaque)
             if (s->event_reader_pos == sizeof(s->event_rcb)) {
                 s->event_reader_pos = 0;
                 qemu_rbd_complete_aio(s->event_rcb);
-                s->qemu_aio_count--;
             }
         }
     } while (ret < 0 && errno == EINTR);
 }
 
-static int qemu_rbd_aio_flush_cb(void *opaque)
-{
-    BDRVRBDState *s = opaque;
-
-    return (s->qemu_aio_count > 0);
-}
-
 /* TODO Convert to fine grained options */
 static QemuOptsList runtime_opts = {
     .name = "rbd",
@@ -455,7 +447,8 @@ static QemuOptsList runtime_opts = {
     },
 };
 
-static int qemu_rbd_open(BlockDriverState *bs, QDict *options, int flags)
+static int qemu_rbd_open(BlockDriverState *bs, QDict *options, int flags,
+                         Error **errp)
 {
     BDRVRBDState *s = bs->opaque;
     char pool[RBD_MAX_POOL_NAME_SIZE];
@@ -554,7 +547,7 @@ static int qemu_rbd_open(BlockDriverState *bs, QDict *options, int flags)
     fcntl(s->fds[0], F_SETFL, O_NONBLOCK);
     fcntl(s->fds[1], F_SETFL, O_NONBLOCK);
     qemu_aio_set_fd_handler(s->fds[RBD_FD_READ], qemu_rbd_aio_event_reader,
-                            NULL, qemu_rbd_aio_flush_cb, s);
+                            NULL, s);
 
 
     qemu_opts_del(opts);
@@ -578,7 +571,7 @@ static void qemu_rbd_close(BlockDriverState *bs)
 
     close(s->fds[0]);
     close(s->fds[1]);
-    qemu_aio_set_fd_handler(s->fds[RBD_FD_READ], NULL, NULL, NULL, NULL);
+    qemu_aio_set_fd_handler(s->fds[RBD_FD_READ], NULL, NULL, NULL);
 
     rbd_close(s->image);
     rados_ioctx_destroy(s->io_ctx);
@@ -741,8 +734,6 @@ static BlockDriverAIOCB *rbd_start_aio(BlockDriverState *bs,
     off = sector_num * BDRV_SECTOR_SIZE;
     size = nb_sectors * BDRV_SECTOR_SIZE;
 
-    s->qemu_aio_count++; /* All the RADOSCB */
-
     rcb = g_malloc(sizeof(RADOSCB));
     rcb->done = 0;
     rcb->acb = acb;
@@ -779,7 +770,6 @@ static BlockDriverAIOCB *rbd_start_aio(BlockDriverState *bs,
 
 failed:
     g_free(rcb);
-    s->qemu_aio_count--;
     qemu_aio_release(acb);
     return NULL;
 }
@@ -903,12 +893,31 @@ static int qemu_rbd_snap_create(BlockDriverState *bs,
 }
 
 static int qemu_rbd_snap_remove(BlockDriverState *bs,
-                                const char *snapshot_name)
+                                const char *snapshot_id,
+                                const char *snapshot_name,
+                                Error **errp)
 {
     BDRVRBDState *s = bs->opaque;
     int r;
 
+    if (!snapshot_name) {
+        error_setg(errp, "rbd need a valid snapshot name");
+        return -EINVAL;
+    }
+
+    /* If snapshot_id is specified, it must be equal to name, see
+       qemu_rbd_snap_list() */
+    if (snapshot_id && strcmp(snapshot_id, snapshot_name)) {
+        error_setg(errp,
+                   "rbd do not support snapshot id, it should be NULL or "
+                   "equal to snapshot name");
+        return -EINVAL;
+    }
+
     r = rbd_snap_remove(s->image, snapshot_name);
+    if (r < 0) {
+        error_setg_errno(errp, -r, "Failed to remove the snapshot");
+    }
     return r;
 }
 
@@ -993,6 +1002,7 @@ static QEMUOptionParameter qemu_rbd_create_options[] = {
 static BlockDriver bdrv_rbd = {
     .format_name        = "rbd",
     .instance_size      = sizeof(BDRVRBDState),
+    .bdrv_needs_filename = true,
     .bdrv_file_open     = qemu_rbd_open,
     .bdrv_close         = qemu_rbd_close,
     .bdrv_create        = qemu_rbd_create,