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xfs: add a lock class for group/project dquots

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We can have both a user and a group/project dquot locked at the same time,
as long as the user dquot is locked first.  Tell lockdep about that fact
by making the group/project dquots a different lock class.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Christoph Hellwig 2009-01-19 02:03:25 +01:00 committed by Lachlan McIlroy
parent 4f2d4ac6e5
commit 5aa2dc0a06
1 changed files with 11 additions and 1 deletions
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12
fs/xfs/quota/xfs_dquot.c
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@ -73,6 +73,8 @@ int xfs_dqreq_num;
int xfs_dqerror_mod = 33; int xfs_dqerror_mod = 33;
#endif #endif
static struct lock_class_key xfs_dquot_other_class;
/* /*
* Allocate and initialize a dquot. We don't always allocate fresh memory; * Allocate and initialize a dquot. We don't always allocate fresh memory;
* we try to reclaim a free dquot if the number of incore dquots are above * we try to reclaim a free dquot if the number of incore dquots are above
@ -139,7 +141,15 @@ xfs_qm_dqinit(
ASSERT(dqp->q_trace); ASSERT(dqp->q_trace);
xfs_dqtrace_entry(dqp, "DQRECLAIMED_INIT"); xfs_dqtrace_entry(dqp, "DQRECLAIMED_INIT");
#endif #endif
} }
/*
* In either case we need to make sure group quotas have a different
* lock class than user quotas, to make sure lockdep knows we can
* locks of one of each at the same time.
*/
if (!(type & XFS_DQ_USER))
lockdep_set_class(&dqp->q_qlock, &xfs_dquot_other_class);
/* /*
* log item gets initialized later * log item gets initialized later