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Date:   Mon, 12 Aug 2019 22:52:19 +1000
From:   Matthew Bobrowski <>
Subject: [PATCH 0/5] ext4: direct IO via iomap infrastructure

This patch series converts the ext4 direct IO code paths to make use of the
iomap infrastructure and removes the old buffer_head direct-io based
implementation. The result is that ext4 is converted to the newer framework
and that it may _possibly_ gain a performance boost for O_SYNC | O_DIRECT IO.

These changes have been tested using xfstests in both DAX and non-DAX modes
using various configurations i.e. 4k, dioread_nolock, dax.

Matthew Bobrowski (5):
  ext4: introduce direct IO read code path using iomap infrastructure
  ext4: move inode extension/truncate code out from ext4_iomap_end()
  iomap: modify ->end_io() calling convention
  ext4: introduce direct IO write code path using iomap infrastructure
  ext4: clean up redundant buffer_head direct IO code

 fs/ext4/ext4.h        |   3 -
 fs/ext4/extents.c     |   8 +-
 fs/ext4/file.c        | 329 +++++++++++++++++++++++++++-------
 fs/ext4/inode.c       | 488 +++++---------------------------------------------
 fs/iomap/direct-io.c  |   9 +-
 fs/xfs/xfs_file.c     |  17 +-
 include/linux/iomap.h |   4 +-
 7 files changed, 322 insertions(+), 536 deletions(-)


Matthew Bobrowski

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