What's done in the source's context change notifier is moving the
target's context to follow the new one, so we request this permission
here.

Signed-off-by: Fam Zheng <famz@redhat.com>
---
 block/mirror.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/block/mirror.c b/block/mirror.c
index 7ab3289..fe2fb7a 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -1189,6 +1189,7 @@ static void mirror_start_job(const char *job_id, BlockDriverState *bs,
     target_is_backing = bdrv_chain_contains(bs, target);
     target_graph_mod = (backing_mode != MIRROR_LEAVE_BACKING_CHAIN);
     s->target = blk_new(BLK_PERM_WRITE | BLK_PERM_RESIZE |
+                        BLK_PERM_AIO_CONTEXT_CHANGE |
                         (target_graph_mod ? BLK_PERM_GRAPH_MOD : 0),
                         BLK_PERM_WRITE_UNCHANGED |
                         (target_is_backing ? BLK_PERM_CONSISTENT_READ |
-- 
2.9.3

On Wed, Apr 19, 2017 at 05:43:48PM +0800, Fam Zheng wrote:
> What's done in the source's context change notifier is moving the
> target's context to follow the new one, so we request this permission
> here.
> 
> Signed-off-by: Fam Zheng <famz@redhat.com>
> ---
>  block/mirror.c | 1 +
>  1 file changed, 1 insertion(+)

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>