Re: [PATCH 10/12] fuse: update ki_pos in fuse_perform_write

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On Wed, 31 May 2023 at 09:51, Christoph Hellwig <hch@xxxxxx> wrote:
>
> Both callers of fuse_perform_write need to updated ki_pos, move it into
> common code.
>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> Reviewed-by: Damien Le Moal <dlemoal@xxxxxxxxxx>
> ---
>  fs/fuse/file.c | 23 ++++++++++-------------
>  1 file changed, 10 insertions(+), 13 deletions(-)
>
> diff --git a/fs/fuse/file.c b/fs/fuse/file.c
> index 97d435874b14aa..e60e48bf392d49 100644
> --- a/fs/fuse/file.c
> +++ b/fs/fuse/file.c
> @@ -1329,7 +1329,10 @@ static ssize_t fuse_perform_write(struct kiocb *iocb,
>         fuse_write_update_attr(inode, pos, res);
>         clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
>
> -       return res > 0 ? res : err;
> +       if (!res)
> +               return err;
> +       iocb->ki_pos += res;
> +       return res;
>  }
>
>  static ssize_t fuse_cache_write_iter(struct kiocb *iocb, struct iov_iter *from)
> @@ -1341,7 +1344,6 @@ static ssize_t fuse_cache_write_iter(struct kiocb *iocb, struct iov_iter *from)
>         struct inode *inode = mapping->host;
>         ssize_t err;
>         struct fuse_conn *fc = get_fuse_conn(inode);
> -       loff_t endbyte = 0;
>
>         if (fc->writeback_cache) {
>                 /* Update size (EOF optimization) and mode (SUID clearing) */
> @@ -1375,19 +1377,20 @@ static ssize_t fuse_cache_write_iter(struct kiocb *iocb, struct iov_iter *from)
>                 goto out;
>
>         if (iocb->ki_flags & IOCB_DIRECT) {
> -               loff_t pos = iocb->ki_pos;
> +               loff_t pos, endbyte;
> +
>                 written = generic_file_direct_write(iocb, from);
>                 if (written < 0 || !iov_iter_count(from))
>                         goto out;
>
> -               pos += written;
> -
> -               written_buffered = fuse_perform_write(iocb, mapping, from, pos);
> +               written_buffered = fuse_perform_write(iocb, mapping, from,
> +                                                     iocb->ki_pos);
>                 if (written_buffered < 0) {
>                         err = written_buffered;
>                         goto out;
>                 }
> -               endbyte = pos + written_buffered - 1;
> +               pos = iocb->ki_pos - written_buffered;
> +               endbyte = iocb->ki_pos - 1;
>
>                 err = filemap_write_and_wait_range(file->f_mapping, pos,
>                                                    endbyte);
> @@ -1399,17 +1402,11 @@ static ssize_t fuse_cache_write_iter(struct kiocb *iocb, struct iov_iter *from)
>                                          endbyte >> PAGE_SHIFT);
>
>                 written += written_buffered;
> -               iocb->ki_pos = pos + written_buffered;
>         } else {
>                 written = fuse_perform_write(iocb, mapping, from, iocb->ki_pos);
> -               if (written >= 0)
> -                       iocb->ki_pos += written;
>         }
>  out:
>         inode_unlock(inode);
> -       if (written > 0)
> -               written = generic_write_sync(iocb, written);

Why remove generic_write_sync()?  Definitely doesn't belong in this
patch even if there's a good reason.

Sorry, didn't notice this in the last round.

Thanks,
Miklos



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