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

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Date:   Tue, 23 May 2023 18:02:17 +0200
From:   Christoph Hellwig <hch@....de>
To:     Damien Le Moal <dlemoal@...nel.org>
Cc:     Christoph Hellwig <hch@....de>,
        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>,
        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 Mon, May 22, 2023 at 09:01:05AM +0900, Damien Le Moal wrote:
> > -	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 ?

No.  iomap_iter does not return te amount of bytes written.