diff options
| author | Christoph Hellwig <hch@lst.de> | 2009-01-19 02:03:19 +0100 |
|---|---|---|
| committer | Christoph Hellwig <hch@brick.lst.de> | 2009-01-19 02:03:19 +0100 |
| commit | 5bb87a33b2cfb8e7ef3383718274094bdff266a3 (patch) | |
| tree | 7917b0354e01dde2fc321a48214f72333aab3073 /fs/xfs/quota/xfs_dquot.c | |
| parent | a4edd1da20af79b2e92efeee3ca94831c8024d61 (diff) | |
xfs: lockdep annotations for xfs_dqlock2
xfs_dqlock2 locks two xfs_dquots, which is fine as it always locks the
dquot with the lower id first. Use mutex_lock_nested to tell lockdep
about this fact.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/xfs/quota/xfs_dquot.c')
| -rw-r--r-- | fs/xfs/quota/xfs_dquot.c | 24 |
1 files changed, 14 insertions, 10 deletions
diff --git a/fs/xfs/quota/xfs_dquot.c b/fs/xfs/quota/xfs_dquot.c index d68b4e1cf1d..ebdf3c842dc 100644 --- a/fs/xfs/quota/xfs_dquot.c +++ b/fs/xfs/quota/xfs_dquot.c @@ -1383,6 +1383,12 @@ xfs_dqunlock_nonotify( mutex_unlock(&(dqp->q_qlock)); } +/* + * Lock two xfs_dquot structures. + * + * To avoid deadlocks we always lock the quota structure with + * the lowerd id first. + */ void xfs_dqlock2( xfs_dquot_t *d1, @@ -1392,18 +1398,16 @@ xfs_dqlock2( ASSERT(d1 != d2); if (be32_to_cpu(d1->q_core.d_id) > be32_to_cpu(d2->q_core.d_id)) { - xfs_dqlock(d2); - xfs_dqlock(d1); + mutex_lock(&d2->q_qlock); + mutex_lock_nested(&d1->q_qlock, XFS_QLOCK_NESTED); } else { - xfs_dqlock(d1); - xfs_dqlock(d2); - } - } else { - if (d1) { - xfs_dqlock(d1); - } else if (d2) { - xfs_dqlock(d2); + mutex_lock(&d1->q_qlock); + mutex_lock_nested(&d2->q_qlock, XFS_QLOCK_NESTED); } + } else if (d1) { + mutex_lock(&d1->q_qlock); + } else if (d2) { + mutex_lock(&d2->q_qlock); } } |