linux-ext4 - [PATCH 0/3] Add folio_zero_tail() and folio_fill

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Message-Id: <20231107212643.3490372-1-willy@infradead.org>
Date:   Tue,  7 Nov 2023 21:26:39 +0000
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-ext4@...r.kernel.org, gfs2@...ts.linux.dev,
        linux-fsdevel@...r.kernel.org, linux-xfs@...r.kernel.org,
        "Darrick J . Wong" <djwong@...nel.org>,
        linux-erofs@...ts.ozlabs.org, "Theodore Ts'o" <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Andreas Gruenbacher <agruenba@...hat.com>
Subject: [PATCH 0/3] Add folio_zero_tail() and folio_fill_tail()

I'm trying to make it easier for filesystems with tailpacking /
stuffing / inline data to use folios.  The primary function here is
folio_fill_tail().  You give it a pointer to memory where the data
currently is, and it takes care of copying it into the folio at that
offset.  That works for gfs2 & iomap.  Then There's Ext4.  Rather than
gin up some kind of specialist "Here's a two pointers to two blocks
of memory" routine, just let it do its current thing, and let it call
folio_zero_tail(), which is also called by folio_fill_tail().

Other filesystems can be converted later; these ones seemed like good
examples as they're already partly or completely converted to folios.

Matthew Wilcox (Oracle) (3):
  mm: Add folio_zero_tail() and use it in ext4
  mm: Add folio_fill_tail() and use it in iomap
  gfs2: Convert stuffed_readpage() to stuffed_read_folio()

 fs/ext4/inline.c        |  3 +-
 fs/gfs2/aops.c          | 37 +++++++++-----------
 fs/iomap/buffered-io.c  | 14 ++------
 include/linux/highmem.h | 76 +++++++++++++++++++++++++++++++++++++++++
 4 files changed, 96 insertions(+), 34 deletions(-)

-- 
2.42.0