linux-ext4 - remove generic

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Date:   Thu, 29 Dec 2022 06:10:25 -1000
From:   Christoph Hellwig <hch@....de>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        "Theodore Ts'o" <tytso@....edu>, Jan Kara <jack@...e.com>,
        Konstantin Komarov <almaz.alexandrovich@...agon-software.com>,
        Mark Fasheh <mark@...heh.com>,
        Joel Becker <jlbec@...lplan.org>,
        Joseph Qi <joseph.qi@...ux.alibaba.com>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        ntfs3@...ts.linux.dev, ocfs2-devel@....oracle.com,
        linux-mm@...ck.org
Subject: remove generic_writepages

Hi all,

this series removes generic_writepages by open coding the current
functionality in the three remaining callers.  Besides removing some
code the main benefit is that one of the few remaining ->writepage
callers from outside the core page cache code go away.

Note that testing has been a bit limited - ntfs3 does not seem to
be supported by xfstests at all, and xfstests on ocfs2 is a complete
shit show even for the base line.

Diffstat:
 fs/jbd2/commit.c          |   25 ---------------------
 fs/jbd2/journal.c         |    1 
 fs/mpage.c                |    8 ------
 fs/ntfs3/inode.c          |   33 +++++++++++++---------------
 fs/ocfs2/journal.c        |   16 +++++++++++++
 include/linux/jbd2.h      |    2 -
 include/linux/writeback.h |    2 -
 mm/page-writeback.c       |   53 +++++++++++++---------------------------------
 8 files changed, 45 insertions(+), 95 deletions(-)