diff options
| author | Dave Chinner <david@fromorbit.com> | 2013-07-19 09:59:59 +1000 |
|---|---|---|
| committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2013-07-19 13:11:29 +1000 |
| commit | 15c500e98138dc8f3277569e3661a6321764d12b (patch) | |
| tree | 929833d06d5bd47931700ffd2cd520fbe4e1c7a4 | |
| parent | f6a64719c5375051b8cff9f0457ceee8967867a1 (diff) | |
xfs: fix dquot isolation hang
The new LRU list isolation code in xfs_qm_dquot_isolate() isn't
completely up to date. Firstly, it needs conversion to return enum
lru_status values, not raw numbers. Secondly - most importantly - it
fails to unlock the dquot and relock the LRU in the LRU_RETRY path.
This leads to deadlocks in xfstests generic/232. Fix them.
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Cc: Glauber Costa <glommer@gmail.com>
Cc: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
| -rw-r--r-- | fs/xfs/xfs_qm.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/fs/xfs/xfs_qm.c b/fs/xfs/xfs_qm.c index 6c4a587aac71..5be049d9a6bb 100644 --- a/fs/xfs/xfs_qm.c +++ b/fs/xfs/xfs_qm.c @@ -707,7 +707,7 @@ xfs_qm_dquot_isolate( trace_xfs_dqreclaim_want(dqp); list_del_init(&dqp->q_lru); XFS_STATS_DEC(xs_qm_dquot_unused); - return 0; + return LRU_REMOVED; } /* @@ -753,17 +753,19 @@ xfs_qm_dquot_isolate( XFS_STATS_DEC(xs_qm_dquot_unused); trace_xfs_dqreclaim_done(dqp); XFS_STATS_INC(xs_qm_dqreclaims); - return 0; + return LRU_REMOVED; out_miss_busy: trace_xfs_dqreclaim_busy(dqp); XFS_STATS_INC(xs_qm_dqreclaim_misses); - return 2; + return LRU_SKIP; out_unlock_dirty: trace_xfs_dqreclaim_busy(dqp); XFS_STATS_INC(xs_qm_dqreclaim_misses); - return 3; + xfs_dqunlock(dqp); + spin_lock(lru_lock); + return LRU_RETRY; } static unsigned long |