[PATCH 0/5] xfs: quota deadlock fixes

[Brian Foster <bfoster@redhat.com>]

Hi all,

This is a collection of several quota related deadlock fixes for
problems that have been reported to the list recently.

Patch 1 fixes the low memory quotacheck problem reported by Martin[1].
Dave is CC'd as he had comments on this particular thread that started a
discussion, but I hadn't heard anything back since my last response.

Patch 2 fixes a separate problem I ran into while attempting to
reproduce Eryu's xfs/305 hang report[2]. 

Patches 3-5 fix the actual problem reported by Eryu, which is a quotaoff
deadlock reproduced by xfs/305.

Further details are included in the individual commit log descriptions.
Thoughts, reviews, flames appreciated.

Eryu,

I've run several hundred iterations of this on your reproducer system
without reproducing the hang. I have reproduced a reset overnight but
still haven't been able to grab a stack trace from that occurrence (I'll
try again today/tonight with better console logging). I suspect this is
a separate problem (possibly just an ASSERT() failure as this is a DEBUG
kernel), but I'd appreciate any testing you can run against these
patches to verify.

Brian

[1] http://www.spinics.net/lists/linux-xfs/msg01901.html
[2] http://www.spinics.net/lists/linux-xfs/msg03835.html

Brian Foster (5):
  xfs: bypass dquot reclaim to avoid quotacheck deadlock
  xfs: allocate quotaoff transactions up front to avoid log deadlock
  xfs: support ability to wait on new inodes
  xfs: update ag iterator to support wait on new inodes
  xfs: wait on new inodes during quotaoff dquot release

 fs/xfs/xfs_icache.c      | 58 ++++++++++++++++++++++++++++++++++++++++--------
 fs/xfs/xfs_icache.h      |  8 +++++++
 fs/xfs/xfs_inode.h       |  4 +++-
 fs/xfs/xfs_qm.c          | 11 +++++++++
 fs/xfs/xfs_qm.h          |  1 +
 fs/xfs/xfs_qm_syscalls.c | 45 +++++++++++++++++++++----------------
 6 files changed, 98 insertions(+), 29 deletions(-)

-- 
2.7.4