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| author |   Dave Chinner <david@fromorbit.com> | 2013-08-28 10:18:08 +1000 |
|---|---|---|
| committer |   Al Viro <viro@zeniv.linux.org.uk> | 2013-09-10 18:56:31 -0400 |
| commit | 35163417fb7a55a24b6b0ebb102e9991adf309aa (patch) | |
| tree | 070f440f9f3e34a712a53b8d1cf7eea9f1b0c443 /fs/xfs | |
| parent | xfs-convert-dquot-cache-lru-to-list_lru-fix (diff) | |
| download | linux-dev-35163417fb7a55a24b6b0ebb102e9991adf309aa.tar.xz linux-dev-35163417fb7a55a24b6b0ebb102e9991adf309aa.zip | |
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>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/xfs')
| -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 1a4217e52c9f..a29169b062e3 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 |