[Qemu-devel] [PATCH RESEND 20/50] blockdev: Check blk_is_available() in sn-del-int-sync

[Max Reitz]

Check whether the BlockBackend is actually available at the start of
snapshot-delete-internal-sync.

Signed-off-by: Max Reitz <address@hidden>
---
 blockdev.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/blockdev.c b/blockdev.c
index ae1137f..858d181 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1096,18 +1096,23 @@ SnapshotInfo 
*qmp_blockdev_snapshot_delete_internal_sync(const char *device,
                                                          const char *name,
                                                          Error **errp)
 {
-    BlockDriverState *bs = bdrv_find(device);
+    BlockBackend *blk;
+    BlockDriverState *bs;
     AioContext *aio_context;
     QEMUSnapshotInfo sn;
     Error *local_err = NULL;
     SnapshotInfo *info = NULL;
     int ret;
 
-    if (!bs) {
+    blk = blk_by_name(device);
+    if (!blk) {
         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
         return NULL;
     }
 
+    aio_context = blk_get_aio_context(blk);
+    aio_context_acquire(aio_context);
+
     if (!has_id) {
         id = NULL;
     }
@@ -1118,11 +1123,14 @@ SnapshotInfo 
*qmp_blockdev_snapshot_delete_internal_sync(const char *device,
 
     if (!id && !name) {
         error_setg(errp, "Name or id must be provided");
-        return NULL;
+        goto out_aio_context;
     }
 
-    aio_context = bdrv_get_aio_context(bs);
-    aio_context_acquire(aio_context);
+    if (!blk_is_available(blk)) {
+        error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
+        goto out_aio_context;
+    }
+    bs = blk_bs(blk);
 
     if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
         goto out_aio_context;
-- 
2.1.0