block: Fix bdrv_has_zero_init

Assuming that any image on a block device is not properly zero-initialized is
actually wrong: Only raw images have this problem. Any other image format
shouldn't care about it, they initialize everything properly themselves.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/block_int.h b/block_int.h
index f075a8cba5..7d5e7515d2 100644
--- a/block_int.h
+++ b/block_int.h
@@ -127,8 +127,11 @@ struct BlockDriver {
 
     void (*bdrv_debug_event)(BlockDriverState *bs, BlkDebugEvent event);
 
-    /* Set if newly created images are not guaranteed to contain only zeros */
-    int no_zero_init;
+    /*
+     * Returns 1 if newly created images are guaranteed to contain only
+     * zeros, 0 otherwise.
+     */
+    int (*bdrv_has_zero_init)(BlockDriverState *bs);
 
     QLIST_ENTRY(BlockDriver) list;
 };