[PATCH v2 0/6] xfs: log recovery wrap and tail overwrite fixes

[Brian Foster <bfoster@redhat.com>]

Hi all,

This is v2 of the tail overwrite detection series. Patches 1-4 include
mostly minor changes to fix up some error handling issues and whatnot.
Patch 5 is new and updates both of the torn write and tail overwrite
detection mechanisms to handle corruption errors along with crc mismatch
errors. Patch 6 is also new and a trivial introduction of a tracepoint.

This has survived a decent amount of testing to this point with various
block sizes, logbsize values, and feature settings (debug on/off, crc
on/off, reflink on/off) on a couple different arches (x86-64, ppc64).
Thoughts, reviews, flames appreciated.

Brian

v2:
- Fix 64-bit division.
- Fix up error checking in xlog_verify_[head|tail]() to only move tail
  tail on corruption and otherwise fail mount immediately.
- Added patch 5 to handle -EFSCORRUPTED on head/tail verification.
- Added patch 6 to introduce log head/tail tracepoint.
v1: http://www.spinics.net/lists/linux-xfs/msg07974.html
- Add patch to fix log recovery header wrapping problem.
- Replace transaction reservation rfc with log recovery based fix.
- Replace custom log pinning sysfs knob with error injection tag.
rfc: http://www.spinics.net/lists/linux-xfs/msg07623.html

Brian Foster (6):
  xfs: fix recovery failure when log record header wraps log end
  xfs: always verify the log tail during recovery
  xfs: fix log recovery corruption error due to tail overwrite
  xfs: add log item pinning error injection tag
  xfs: handle -EFSCORRUPTED during head/tail verification
  xfs: add log recovery tracepoint for head/tail

 fs/xfs/xfs_error.c       |   3 +
 fs/xfs/xfs_error.h       |   4 +-
 fs/xfs/xfs_log_recover.c | 157 +++++++++++++++++++++++++++++------------------
 fs/xfs/xfs_trace.h       |  18 ++++++
 fs/xfs/xfs_trans_ail.c   |  17 ++++-
 5 files changed, 137 insertions(+), 62 deletions(-)

-- 
2.9.4