linux-ext4 - [PATCH 0/10 v3] ext4: Convert ext4 DAX IO to iomap framework

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Date:   Fri, 18 Nov 2016 09:47:00 +0100
From:   Jan Kara <jack@...e.cz>
To:     Ted Tso <tytso@....edu>
Cc:     <linux-ext4@...r.kernel.org>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Jan Kara <jack@...e.cz>
Subject: [PATCH 0/10 v3] ext4: Convert ext4 DAX IO to iomap framework

Hello,

this is the third revision of my patches to convert ext4 DAX IO paths to the
new iomap framework and removes the old bh-based DAX functions. As a result
ext4 gains PMD page fault support, also some other minor bugs get fixed. The
patch set is based on Ross' DAX PMD page fault support series currently
carried in XFS tree [1]. It passes xfstests both in DAX and non-DAX mode -
I'd just note that ext4/001 test is failing due to different block layout
generated by iomap code (caused by patch "ext4: Avoid split extents for DAX
writes"). I'll fix that up in xfstests once patches get into ext4 tree.

I have pushed out updated version of these patches including the follow-up
DAX patches to:

git://get.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs.git dax

for easy testing. Ted, can you pull branch [1] into your tree and apply
these patches on top of that if nobody has other comments? I'd like to get
things prepared for the coming merge window.

Changes since v2:
* Various smaller fixes based on Ross' review, added his Reviewed-by tags
* rebase on top of XFS tree branch

Changes since v1:
* Changed ext4_iomap_begin() and ext4_iomap_end() to not keep transaction
  handle running between these two functions as that causes lock ordering
  issues.

								Honza

[1] git://git.kernel.org/pub/scm/linux/kernel/git/dgc/linux-xfs.git dax-4.10-iomap-pmd
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