[PATCH v9 00/16] xfs: online scrub xref support

From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: darrick.wong@oracle.com
Cc: linux-xfs@vger.kernel.org
Subject: [PATCH v9 00/16] xfs: online scrub xref support
Date: Fri, 11 Aug 2017 00:10:12 -0700	[thread overview]
Message-ID: <150243541274.29473.1227559008347544526.stgit@magnolia> (raw)

Hi all,

This is the ninth revision of a patchset that adds to XFS kernel
support for online metadata scrubbing and repair.  There aren't any
on-disk format changes.  The overview of the online scrub functionality
isn't any different than it was with the first kernel series, so I'll
dive into what's in this set.

Today's submission is the third of four parts; it adds to the various
metadata scrubbers the ability to cross-reference other metadata.  If
a given record has a corresponding record somewhere else (e.g. each
inobt record has a corresponding rmapbt record for inodes) or lacks a
corresponding record elsewhere (e.g. each bmbt record does /not/ match
to any bnobt records) then we can be far more certain of the
filesystem's correctness.  We try to augment each scrubber with as many
cross-reference checks as we possibly can, though we are careful to
avoid deadlocks when taking locks in reverse order (rmapbt).

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
4.13-rc4.  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