bdrv_query_image_info Error parameter added

Inform a user in case qcow2_get_specific_info fails to obtain
QCOW2 image specific information. This patch is preliminary to
the one "qcow2: Add list of bitmaps to ImageInfoSpecificQCow2".

Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <1549638368-530182-2-git-send-email-andrey.shinkevich@virtuozzo.com>
Signed-off-by: Eric Blake <eblake@redhat.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/block.c b/block.c
index b67d9b7b65..4ad0e90d7e 100644
--- a/block.c
+++ b/block.c
@@ -4462,11 +4462,12 @@ int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
     return drv->bdrv_get_info(bs, bdi);
 }
 
-ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs)
+ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs,
+                                          Error **errp)
 {
     BlockDriver *drv = bs->drv;
     if (drv && drv->bdrv_get_specific_info) {
-        return drv->bdrv_get_specific_info(bs);
+        return drv->bdrv_get_specific_info(bs, errp);
     }
     return NULL;
 }