[Qemu-block] [PATCH for-2.7] block: Accept any target node for transactional blockdev-backup

[Kevin Wolf]

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 <address@hidden>
---
 blockdev.c           | 8 ++++----
 qapi/block-core.json | 2 +-
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/blockdev.c b/blockdev.c
index eafeba9..2161400 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;
diff --git a/qapi/block-core.json b/qapi/block-core.json
index 2bbc027..5e2d7d7 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -927,7 +927,7 @@
 #
 # @device: the name of the device which should be copied.
 #
-# @target: the name of the backup target device.
+# @target: the device name or node-name of the backup target node.
 #
 # @sync: what parts of the disk image should be copied to the destination
 #        (all the disk, only the sectors allocated in the topmost image, or
-- 
1.8.3.1