X-Git-Url: https://git.proxmox.com/?a=blobdiff_plain;f=block_int.h;h=7946cf66a1d6375e83bc7ad37e08406c561a71b8;hb=f08f2ddae078e8a7683f8b16da8e0cc3029c7b89;hp=7be2988ca7098f3ca16bf24ff69dfa957690fb7a;hpb=1a6d39fd71ddf90c5b76026cac4d5ff51fbaf8d8;p=qemu.git

diff --git a/block_int.h b/block_int.h
index 7be2988ca..7946cf66a 100644
--- a/block_int.h
+++ b/block_int.h
@@ -131,6 +131,14 @@ struct BlockDriver {
         int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
     int coroutine_fn (*bdrv_co_writev)(BlockDriverState *bs,
         int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
+    /*
+     * Efficiently zero a region of the disk image.  Typically an image format
+     * would use a compact metadata representation to implement this.  This
+     * function pointer may be NULL and .bdrv_co_writev() will be called
+     * instead.
+     */
+    int coroutine_fn (*bdrv_co_write_zeroes)(BlockDriverState *bs,
+        int64_t sector_num, int nb_sectors);
     int coroutine_fn (*bdrv_co_discard)(BlockDriverState *bs,
         int64_t sector_num, int nb_sectors);
     int coroutine_fn (*bdrv_co_is_allocated)(BlockDriverState *bs,