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Re: [Qemu-block] [PULL 4/9] block: workaround for unaligned byte range i
From: |
Andrey Shinkevich |
Subject: |
Re: [Qemu-block] [PULL 4/9] block: workaround for unaligned byte range in fallocate() |
Date: |
Fri, 6 Sep 2019 12:51:18 +0000 |
Many thanks
Andrey
On 05/09/2019 21:21, Eric Blake wrote:
> From: Andrey Shinkevich <address@hidden>
>
> 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 <address@hidden>
> Suggested-by: Eric Blake <address@hidden>
> Signed-off-by: Andrey Shinkevich <address@hidden>
> Reviewed-by: Eric Blake <address@hidden>
> Reviewed-by: Denis V. Lunev <address@hidden>
> Message-Id: <address@hidden>
> Signed-off-by: Eric Blake <address@hidden>
> ---
> block/io.c | 2 +-
> block/file-posix.c | 7 +++++++
> 2 files changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/block/io.c b/block/io.c
> index 0fa10831edb7..16a598fd0857 100644
> --- a/block/io.c
> +++ b/block/io.c
> @@ -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;
>
> diff --git a/block/file-posix.c b/block/file-posix.c
> index 71f168ee2f13..87c5a4ccbdc8 100644
> --- a/block/file-posix.c
> +++ b/block/file-posix.c
> @@ -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;
> }
>
--
With the best regards,
Andrey Shinkevich