linux-ext4 - Re: [PATCH 07/13] iomap: update ki_pos in iomap_file_buffered

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Message-ID: <5c66fe46-13eb-d9d2-e107-cc48eb50688f@kernel.org>
Date:   Mon, 22 May 2023 09:01:05 +0900
From:   Damien Le Moal <dlemoal@...nel.org>
To:     Christoph Hellwig <hch@....de>,
        Matthew Wilcox <willy@...radead.org>
Cc:     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>,
        Miklos Szeredi <miklos@...redi.hu>,
        Andreas Gruenbacher <agruenba@...hat.com>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna@...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,
        "open list:F2FS FILE SYSTEM" <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 07/13] iomap: update ki_pos in iomap_file_buffered_write

On 5/19/23 18:35, Christoph Hellwig wrote:
> All callers of iomap_file_buffered_write need to updated ki_pos, move it
> into common code.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>

One nit below.

Acked-by: Damien Le Moal <dlemoal@...nel.org>

> diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
> index 063133ec77f49e..550525a525c45c 100644
> --- a/fs/iomap/buffered-io.c
> +++ b/fs/iomap/buffered-io.c
> @@ -864,16 +864,19 @@ iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *i,
>  		.len		= iov_iter_count(i),
>  		.flags		= IOMAP_WRITE,
>  	};
> -	int ret;
> +	ssize_t ret;
>  
>  	if (iocb->ki_flags & IOCB_NOWAIT)
>  		iter.flags |= IOMAP_NOWAIT;
>  
>  	while ((ret = iomap_iter(&iter, ops)) > 0)
>  		iter.processed = iomap_write_iter(&iter, i);
> -	if (iter.pos == iocb->ki_pos)
> +
> +	if (unlikely(ret < 0))

Nit: This could be if (unlikely(ret <= 0)), no ?

>  		return ret;
> -	return iter.pos - iocb->ki_pos;
> +	ret = iter.pos - iocb->ki_pos;
> +	iocb->ki_pos += ret;
> +	return ret;


-- 
Damien Le Moal
Western Digital Research