From: Max Reitz <mre...@redhat.com>
Signed-off-by: Max Reitz <mre...@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefa...@redhat.com>
Reviewed-by: Alberto Garcia <be...@igalia.com>
Message-id: 20180421132929.21610-5-mre...@redhat.com
Reviewed-by: Kevin Wolf <kw...@redhat.com>
Signed-off-by: Max Reitz <mre...@redhat.com>
---
block/io.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/block/io.c b/block/io.c
index 9e8449e795..ca96b487eb 100644
--- a/block/io.c
+++ b/block/io.c
@@ -1118,13 +1118,15 @@ static int coroutine_fn
bdrv_co_do_copy_on_readv(BdrvChild *child,
/* FIXME: Should we (perhaps conditionally) be setting
* BDRV_REQ_MAY_UNMAP, if it will allow for a sparser copy
* that still correctly reads as zero? */
- ret = bdrv_co_do_pwrite_zeroes(bs, cluster_offset, pnum, 0);
+ ret = bdrv_co_do_pwrite_zeroes(bs, cluster_offset, pnum,
+ BDRV_REQ_WRITE_UNCHANGED);
} else {
/* This does not change the data on the disk, it is not
* necessary to flush even in cache=writethrough mode.
*/
ret = bdrv_driver_pwritev(bs, cluster_offset, pnum,
- &local_qiov, 0);
+ &local_qiov,
+ BDRV_REQ_WRITE_UNCHANGED);
}
if (ret < 0) {
--
2.13.6
