block: Accept any target node for transactional blockdev-backup

Commit 0d978913 changed blockdev-backup to accept arbitrary node names
instead of device names (i.e. root nodes) for the backup target.
However, it forgot to make the same change in transactions and to update
the documentation. This patch fixes these omissions.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/blockdev.c b/blockdev.c
index eafeba96d0..21614004d1 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1937,7 +1937,8 @@ static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
 {
     BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
     BlockdevBackup *backup;
-    BlockBackend *blk, *target;
+    BlockBackend *blk;
+    BlockDriverState *target;
     Error *local_err = NULL;
 
     assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
@@ -1954,15 +1955,14 @@ static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
         return;
     }
 
-    target = blk_by_name(backup->target);
+    target = bdrv_lookup_bs(backup->target, backup->target, errp);
     if (!target) {
-        error_setg(errp, "Device '%s' not found", backup->target);
         return;
     }
 
     /* AioContext is released in .clean() */
     state->aio_context = blk_get_aio_context(blk);
-    if (state->aio_context != blk_get_aio_context(target)) {
+    if (state->aio_context != bdrv_get_aio_context(target)) {
         state->aio_context = NULL;
         error_setg(errp, "Backup between two IO threads is not implemented");
         return;