[v22,0/6] xfs: online repair of inode data

Message

Darrick J. Wong Jan. 1, 2020, 1:03 a.m. UTC

Hi all,

For the third part of the twenty-second revision of the online repair
patchset, we implement repair of extended attribute data.

Patch 1 implements a new data structure for storing arbitrary key/value
pairs, which we're going to need to reconstruct extended attribute
forks.

Patches 2-4 clean up the block unmapping code so that we will be able
to perform a mass reset of an inode's fork.  This is a key component for
salvaging extended attributes, freeing all the attr fork blocks, and
reconstructing the extended attribute data.

Patch 5 implements extended attribute salvage operations.  There is no
redundant or secondary xattr metadata, so the best we can do is trawl
through the attr leaves looking for intact entities.

Patch 6 augments scrub to rebuild extended attributes when any of the
attr blocks are fragmented.

If you're going to start using this mess, you probably ought to just
pull from my git trees, which are linked below.

This is an extraordinary way to destroy everything.  Enjoy!
Comments and questions are, as always, welcome.

--D

kernel git tree:
https://git.kernel.org/cgit/linux/kernel/git/djwong/xfs-linux.git/log/?h=repair-inode-data

xfsprogs git tree:
https://git.kernel.org/cgit/linux/kernel/git/djwong/xfsprogs-dev.git/log/?h=repair-inode-data