linux-ext4 - Re: [PATCH 12/12] fuse: use direct_write

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Date:   Wed, 31 May 2023 11:01:59 +0200
From:   Miklos Szeredi <miklos@...redi.hu>
To:     Christoph Hellwig <hch@....de>
Cc:     Matthew Wilcox <willy@...radead.org>, Jens Axboe <axboe@...nel.dk>,
        Xiubo Li <xiubli@...hat.com>,
        Ilya Dryomov <idryomov@...il.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        "Theodore Ts'o" <tytso@....edu>, Jaegeuk Kim <jaegeuk@...nel.org>,
        Chao Yu <chao@...nel.org>,
        Andreas Gruenbacher <agruenba@...hat.com>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna@...nel.org>,
        Damien Le Moal <dlemoal@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-block@...r.kernel.org, ceph-devel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, cluster-devel@...hat.com,
        linux-xfs@...r.kernel.org, linux-nfs@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH 12/12] fuse: use direct_write_fallback

On Wed, 31 May 2023 at 09:51, Christoph Hellwig <hch@....de> wrote:
>
> Use the generic direct_write_fallback helper instead of duplicating the
> logic.
>
> Signed-off-by: Christoph Hellwig <hch@....de>
> Reviewed-by: Damien Le Moal <dlemoal@...nel.org>
> ---
>  fs/fuse/file.c | 24 ++----------------------
>  1 file changed, 2 insertions(+), 22 deletions(-)
>
> diff --git a/fs/fuse/file.c b/fs/fuse/file.c
> index 025973ad813e05..7a72dc0a691201 100644
> --- a/fs/fuse/file.c
> +++ b/fs/fuse/file.c
> @@ -1340,7 +1340,6 @@ static ssize_t fuse_cache_write_iter(struct kiocb *iocb, struct iov_iter *from)
>         struct file *file = iocb->ki_filp;
>         struct address_space *mapping = file->f_mapping;
>         ssize_t written = 0;
> -       ssize_t written_buffered = 0;
>         struct inode *inode = mapping->host;
>         ssize_t err;
>         struct fuse_conn *fc = get_fuse_conn(inode);
> @@ -1377,30 +1376,11 @@ 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, endbyte;
> -
>                 written = generic_file_direct_write(iocb, from);
>                 if (written < 0 || !iov_iter_count(from))
>                         goto out;
> -
> -               written_buffered = fuse_perform_write(iocb, from);
> -               if (written_buffered < 0) {
> -                       err = written_buffered;
> -                       goto out;
> -               }
> -               pos = iocb->ki_pos - written_buffered;
> -               endbyte = iocb->ki_pos - 1;
> -
> -               err = filemap_write_and_wait_range(file->f_mapping, pos,
> -                                                  endbyte);
> -               if (err)
> -                       goto out;
> -
> -               invalidate_mapping_pages(file->f_mapping,
> -                                        pos >> PAGE_SHIFT,
> -                                        endbyte >> PAGE_SHIFT);
> -
> -               written += written_buffered;
> +               written = direct_write_fallback(iocb, from, written,
> +                               generic_perform_write(iocb, from));

This should use fuse_perform_write().

Last version of the patch was correct; copy-paste error?

Thanks,
Miklos