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Properly lock DQREF() with dqhlock. Missed locking caused counter

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corruption.

Assert that the dq reference value is sane before decrementing it.

Reported and tested by:	pho
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2012-02-22 20:03:51 +00:00
parent 501f538675
commit 2b19466836
1 changed files with 4 additions and 0 deletions
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4
sys/ufs/ufs/ufs_quota.c
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@ -1469,6 +1469,7 @@ dqrele(struct vnode *vp, struct dquot *dq)
if (dq == NODQUOT)
return;
DQH_LOCK();
KASSERT(dq->dq_cnt > 0, ("Lost dq %p reference 1", dq));
if (dq->dq_cnt > 1) {
dq->dq_cnt--;
DQH_UNLOCK();
@ -1479,6 +1480,7 @@ dqrele(struct vnode *vp, struct dquot *dq)
(void) dqsync(vp, dq);
DQH_LOCK();
KASSERT(dq->dq_cnt > 0, ("Lost dq %p reference 2", dq));
if (--dq->dq_cnt > 0)
{
DQH_UNLOCK();
@ -1658,6 +1660,7 @@ quotaref(vp, qrp)
*/
found = 0;
ip = VTOI(vp);
mtx_lock(&dqhlock);
for (i = 0; i < MAXQUOTAS; i++) {
if ((dq = ip->i_dquot[i]) == NODQUOT)
continue;
@ -1665,6 +1668,7 @@ quotaref(vp, qrp)
qrp[i] = dq;
found++;
}
mtx_unlock(&dqhlock);
return (found);
}