Drive backup is a read only operation on source bs. We want to allow
this specific case to enable image-fleecing. Note that when
image-fleecing job starts, the job still add its blocker to source bs,
and any other operation on it will be blocked by that.
Signed-off-by: Fam Zheng <f...@redhat.com>
---
block.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/block.c b/block.c
index a5da656..d30be51 100644
--- a/block.c
+++ b/block.c
@@ -1179,6 +1179,8 @@ int bdrv_open(BlockDriverState *bs, const char *filename,
QDict *options,
"device is used as backing hd of '%s'",
bs->device_name);
bdrv_op_block_all(bs->backing_hd, bs->backing_blocker);
+ bdrv_op_unblock(bs->backing_hd, BLOCK_OP_TYPE_BACKUP,
+ bs->backing_blocker);
pstrcpy(bs->backing_file, sizeof(bs->backing_file),
bs->backing_hd->filename);
pstrcpy(bs->backing_format, sizeof(bs->backing_format),
--
1.8.4.2
