[PATCH 0/2] xfs: fix buffer delwri queue state race

[Brian Foster <bfoster@redhat.com>]

Hi all,

This is an attempt to fix a race when queuing a buffer to a delwri queue
that happens to already sit on a delwri queue wait list. The problem is
reproduced by xfs/305 under particular conditions. The details are
described in the commit log description of patch 2.

This survives xfstests and repeated runs of xfs/305. Note that the test
still reproduces the known log deadlock problem when quotaoff runs
against a heavily loaded fs. I've hacked around that problem locally to
rule it out from repetition testing of xfs/305.

Thoughts, reviews, flames appreciated.

Brian

Brian Foster (2):
  xfs: define internal buf flag for delwri queue wait list
  xfs: allow delwri requeue of wait listed buffers

 fs/xfs/xfs_buf.c | 79 +++++++++++++++++++++++++++++++-----------------
 fs/xfs/xfs_buf.h |  4 ++-
 2 files changed, 54 insertions(+), 29 deletions(-)

-- 
2.17.1