[PATCH 00/11] xfs-4.18: online scrub fixes

["Darrick J. Wong" <darrick.wong@oracle.com>]

Hi all,

Here's a series cleaning up some problems and bugs in the online scrub
code.  Most of the problems fixed here were uncovered through more
thorough testing of the online repair series, which will be posted
shortly.

First, we amend scrub to skip cross-referencing once the first error is
found; this patch hasn't changed since its posting during the 4.17 cycle.

The next five patches refactor the quota code to make it possible to
iterate all the dquots in the system with the quota inode's ILOCK held.
After this, we can drop all the weird code that attaches to the quota ip
in favor of using the well known mechanism that we use for all other
inodes.  This enables us to call the data fork scrubber on the quota
inodes; and the dquot iterator that we created earlier.

The next two patches fix some broken interaction between scrub and the
rest of xfs.

Following that are three fixes to the scrubbers themselves -- the first
checks that a btree block never contains fewer than minrecs records
unless it's the top block in a tree.  The second refactors the
transaction allocation helper; and the last one fixes a potential ABBA
deadlock in the parent scrubber.

If you're going to start using this mess, you probably ought to just
pull from my git trees.  The kernel patches[1] should apply against
4.17-rc1.  xfsprogs[2] and xfstests[3] can be found in their usual
places.  The git trees contain all four series' worth of changes.

This is an extraordinary way to eat your data.  Enjoy!
Comments and questions are, as always, welcome.

--D

[1] https://git.kernel.org/cgit/linux/kernel/git/djwong/xfs-linux.git/log/?h=djwong-devel
[2] https://git.kernel.org/cgit/linux/kernel/git/djwong/xfsprogs-dev.git/log/?h=djwong-devel
[3] https://git.kernel.org/cgit/linux/kernel/git/djwong/xfstests-dev.git/log/?h=djwong-devel