Commit 118f9944 authored by Andrey Shinkevich's avatar Andrey Shinkevich Committed by Stefan Hajnoczi
Browse files

block/io.c: fix for the allocation failure 



On a file system used by the customer, fallocate() returns an error
if the block is not properly aligned. So, bdrv_co_pwrite_zeroes()
fails. We can handle that case the same way as it is done for the
unsupported cases, namely, call to bdrv_driver_pwritev() that writes
zeroes to an image for the unaligned chunk of the block.

Suggested-by: default avatarDenis V. Lunev <den@openvz.org>
Signed-off-by: default avatarAndrey Shinkevich <andrey.shinkevich@virtuozzo.com>
Reviewed-by: default avatarJohn Snow <jsnow@redhat.com>
Message-id: 1554474244-553661-1-git-send-email-andrey.shinkevich@virtuozzo.com
Message-Id: <1554474244-553661-1-git-send-email-andrey.shinkevich@virtuozzo.com>
Signed-off-by: default avatarStefan Hajnoczi <stefanha@redhat.com>
parent 66a5bdf3

block/io.c

+1 −1
Original line number Diff line number Diff line
@@ -1516,7 +1516,7 @@ static int coroutine_fn bdrv_co_do_pwrite_zeroes(BlockDriverState *bs, 
            assert(!bs->supported_zero_flags);

        }



        if (ret == -ENOTSUP && !(flags & BDRV_REQ_NO_FALLBACK)) {

        if (ret < 0 && !(flags & BDRV_REQ_NO_FALLBACK)) {

            /* Fall back to bounce buffer if write zeroes is unsupported */

            BdrvRequestFlags write_flags = flags & ~BDRV_REQ_ZERO_WRITE;