linux-ext4 - Re: [PATCH 03/12] filemap: update ki_pos in generic_perform

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Date:   Mon, 28 Aug 2023 16:15:12 +0200
From:   Christoph Hellwig <hch@....de>
To:     Al Viro <viro@...iv.linux.org.uk>
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>,
        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>,
        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, Hannes Reinecke <hare@...e.de>
Subject: Re: [PATCH 03/12] filemap: update ki_pos in generic_perform_write

On Mon, Aug 28, 2023 at 02:56:15PM +0100, Al Viro wrote:
> The first failure exit does not need any work - the caller had not bumped
> ->ki_pos; the second one (after that 'if (err < 0) {' line) does and that's
> where the patch upthread adds iocb->ki_pos -= buffered_written.
> 
> Or am I completely misparsing what you've written?

No, I misread the patch.  Looks good:

Acked-by: Christoph Hellwig <hch@....de>