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block: workaround for unaligned byte range in fallocate() 

Revert the commit 118f99442d 'block/io.c: fix for the allocation failure'
and use better error handling for file systems that do not support
fallocate() for an unaligned byte range. Allow falling back to pwrite
in case fallocate() returns EINVAL.

Suggested-by: Kevin Wolf <kwolf@redhat.com>
Suggested-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Denis V. Lunev <den@openvz.org>
Message-Id: <1566913973-15490-1-git-send-email-andrey.shinkevich@virtuozzo.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
master
Andrey Shinkevich 2019-08-27 16:52:53 +03:00 committed by Eric Blake
parent 5de47735c7
commit 294682cc3a
2 changed files with 8 additions and 1 deletions
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7
block/file-posix.c
View File

@ -1588,6 +1588,13 @@ static int handle_aiocb_write_zeroes(void *opaque)
if (s->has_write_zeroes) {
int ret = do_fallocate(s->fd, FALLOC_FL_ZERO_RANGE,
aiocb->aio_offset, aiocb->aio_nbytes);
if (ret == -EINVAL) {
/*
* Allow falling back to pwrite for file systems that
* do not support fallocate() for an unaligned byte range.
*/
return -ENOTSUP;
}
if (ret == 0 || ret != -ENOTSUP) {
return ret;
}

2
block/io.c
View File

@ -1746,7 +1746,7 @@ static int coroutine_fn bdrv_co_do_pwrite_zeroes(BlockDriverState *bs,
assert(!bs->supported_zero_flags);
}
if (ret < 0 && !(flags & BDRV_REQ_NO_FALLBACK)) {
if (ret == -ENOTSUP && !(flags & BDRV_REQ_NO_FALLBACK)) {
/* Fall back to bounce buffer if write zeroes is unsupported */
BdrvRequestFlags write_flags = flags & ~BDRV_REQ_ZERO_WRITE;