linux-ext4 - [RFC 0/2] ext4: bmap & fiemap conversion to use iomap

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Date:   Tue, 20 Aug 2019 18:36:32 +0530
From:   Ritesh Harjani <riteshh@...ux.ibm.com>
To:     linux-ext4@...r.kernel.org
Cc:     adilger.kernel@...ger.ca, jack@...e.cz, tytso@....edu,
        mbobrowski@...browski.org, linux-fsdevel@...r.kernel.org,
        Ritesh Harjani <riteshh@...ux.ibm.com>
Subject: [RFC 0/2] ext4: bmap & fiemap conversion to use iomap

Hello,

These are RFC patches to get community view on converting
ext4 bmap & fiemap to iomap infrastructure. This reduces the users
of ext4_get_block API and thus a step towards getting rid of
buffer_heads from ext4. Also reduces the line of code by making
use of iomap infrastructure (ex4_iomap_begin) which is already
used for other operations.

This gets rid of special implementation of ext4_fill_fiemap_extents
& ext4_find_delayed_extent and thus only relies upon ext4_map_blocks
& iomap_fiemap (ext4_iomap_begin) for mapping. It looked more logical
thing to do, but I appreciate if anyone has any review/feedback
comments about this part.

Didn't get any regression on some basic xfstests in tests/ext4/
with mkfs option of "-b 4096". Please let me know if I should also test
any special configurations?

Patches can be cleanly applied over Linux 5.3-rc5.

Ritesh Harjani (2):
  ext4: Move ext4 bmap to use iomap infrastructure.
  ext4: Move ext4_fiemap to iomap infrastructure

 fs/ext4/extents.c | 294 +++++++---------------------------------------
 fs/ext4/inline.c  |  41 -------
 fs/ext4/inode.c   |  17 ++-
 3 files changed, 53 insertions(+), 299 deletions(-)

-- 
2.21.0