[Qemu-block] [PATCH v5 01/15] mirror: inherit supported write/zero flags

[Anton Nefedov]

Signed-off-by: Anton Nefedov <address@hidden>
Reviewed-by: Eric Blake <address@hidden>
---
 block/mirror.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/block/mirror.c b/block/mirror.c
index 307b639..19c8987 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -1064,6 +1064,11 @@ static void 
bdrv_mirror_top_refresh_filename(BlockDriverState *bs, QDict *opts)
     bdrv_refresh_filename(bs->backing->bs);
     pstrcpy(bs->exact_filename, sizeof(bs->exact_filename),
             bs->backing->bs->filename);
+    bs->supported_write_flags = BDRV_REQ_FUA &
+        bs->backing->bs->supported_write_flags;
+    bs->supported_zero_flags =
+        (BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP) &
+        bs->backing->bs->supported_zero_flags;
 }
 
 static void bdrv_mirror_top_close(BlockDriverState *bs)
-- 
2.7.4