[Qemu-devel] [PATCH v8 1/9] mirror: inherit supported write/zero flags

[Anton Nefedov <anton.nefedov@virtuozzo.com>]

Signed-off-by: Anton Nefedov <anton.nefedov@virtuozzo.com>
---
 block/mirror.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/block/mirror.c b/block/mirror.c
index f5bf620..2fb786f 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -1100,6 +1100,15 @@ static BlockDriver bdrv_mirror_top = {
     .bdrv_child_perm            = bdrv_mirror_top_child_perm,
 };
 
+static void mirror_top_set_supported_flags(BlockDriverState *bs)
+{
+    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 mirror_start_job(const char *job_id, BlockDriverState *bs,
                              int creation_flags, BlockDriverState *target,
                              const char *replaces, int64_t speed,
@@ -1165,6 +1174,8 @@ static void mirror_start_job(const char *job_id, BlockDriverState *bs,
         return;
     }
 
+    mirror_top_set_supported_flags(mirror_top_bs);
+
     /* Make sure that the source is not resized while the job is running */
     s = block_job_create(job_id, driver, mirror_top_bs,
                          BLK_PERM_CONSISTENT_READ,
-- 
2.7.4