Adding linux-btrfs to Cc.
Am Freitag, 27. Januar 2012 schrieb Jeff Moyer:
> Hi,
Hi,
> As it stands, generic_file_aio_write will call into generic_write_sync
> when -EIOCBQUEUED is returned from __generic_file_aio_write.
> EIOCBQUEUED indicates that an I/O was submitted but NOT completed.
> Thus, we will flush the disk cache, potentially before the write(s)
> even make it to the disk! Up until now, this has been the best we
> could do, as file systems didn't bother to flush the disk cache after
> an O_SYNC AIO+DIO write. After applying the prior two patches to xfs
> and ext4, at least the major two file systems do the right thing. So,
> let's go ahead and fix this backwards logic.
Would this need an adaption to BTRFS as well?
Thanks,
Martin
> Signed-off-by: Jeff Moyer <jmoyer@xxxxxxxxxx>
> ---
> mm/filemap.c | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/mm/filemap.c b/mm/filemap.c
> index c4ee2e9..004442f 100644
> --- a/mm/filemap.c
> +++ b/mm/filemap.c
> @@ -2634,7 +2634,7 @@ ssize_t generic_file_aio_write(struct kiocb
> *iocb, const struct iovec *iov, ret = __generic_file_aio_write(iocb,
> iov, nr_segs, &iocb->ki_pos); mutex_unlock(&inode->i_mutex);
>
> - if (ret > 0 || ret == -EIOCBQUEUED) {
> + if (ret > 0) {
> ssize_t err;
>
> err = generic_write_sync(file, pos, ret);
--
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA B82F 991B EAAC A599 84C7
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