linux-ext4 - Re: [PATCH 08/13] iomap: assign current->backing_dev_info in iomap_file_buffered

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Date:   Tue, 23 May 2023 18:02:44 +0200
From:   Christoph Hellwig <hch@....de>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     "Darrick J. Wong" <djwong@...nel.org>,
        Christoph Hellwig <hch@....de>, 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>,
        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,
        "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,
        NeilBrown <neilb@...e.de>
Subject: Re: [PATCH 08/13] iomap: assign current->backing_dev_info in
 iomap_file_buffered_write

On Tue, May 23, 2023 at 04:30:51AM +0100, Matthew Wilcox wrote:
> AFAICT (the code went through some metamorphoses in the intervening
> twenty years), the last use of it ended up in current_may_throttle(),
> and it was removed in March 2022 by Neil Brown in commit b9b1335e6403.
> Since then, there have been no users of task->backing_dev_info, and I'm
> pretty sure it can go away.

Oh, nice.  I hadn't noticed it finally went away.  The next iteration
of the series will just remove it.