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block: unblock backup operations in backing file

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Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Changlong Xie <xiecl.fnst@cn.fujitsu.com>
Signed-off-by: Wang WeiWei <wangww.fnst@cn.fujitsu.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Kashyap Chamarthy <kchamart@redhat.com>
Message-id: 1469602913-20979-2-git-send-email-xiecl.fnst@cn.fujitsu.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Wen Congyang 2016-07-27 15:01:42 +08:00 committed by Stefan Hajnoczi
parent b5c7ceaf4b
commit e9d6456e95
1 changed files with 17 additions and 0 deletions
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17
block.c
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@ -1312,6 +1312,23 @@ void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd)
/* Otherwise we won't be able to commit due to check in bdrv_commit */
bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_COMMIT_TARGET,
bs->backing_blocker);
/*
* We do backup in 3 ways:
* 1. drive backup
* The target bs is new opened, and the source is top BDS
* 2. blockdev backup
* Both the source and the target are top BDSes.
* 3. internal backup(used for block replication)
* Both the source and the target are backing file
*
* In case 1 and 2, neither the source nor the target is the backing file.
* In case 3, we will block the top BDS, so there is only one block job
* for the top BDS and its backing chain.
*/
bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_BACKUP_SOURCE,
bs->backing_blocker);
bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_BACKUP_TARGET,
bs->backing_blocker);
out:
bdrv_refresh_limits(bs, NULL);
}