From: Max Reitz Date: Sat, 21 Apr 2018 13:29:24 +0000 (+0200) Subject: block: Set BDRV_REQ_WRITE_UNCHANGED for COR writes X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=7adcf59fecf3c8ce9330430187350b53f9e50cf7;p=qemu.git block: Set BDRV_REQ_WRITE_UNCHANGED for COR writes Signed-off-by: Max Reitz Reviewed-by: Stefan Hajnoczi Reviewed-by: Alberto Garcia Message-id: 20180421132929.21610-5-mreitz@redhat.com Reviewed-by: Kevin Wolf Signed-off-by: Max Reitz --- 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) {