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dlm: reject normal unlock when lock is waiting for lookup 

Non-forced unlocks should be rejected if the lock is waiting on the
rsb_lookup list for another lock to establish the master node.

Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
David Teigland 2008-01-09 10:30:45 -06:00
parent c54e04b00f
commit 42dc1601a9
1 changed files with 5 additions and 4 deletions
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9
fs/dlm/lock.c
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@ -2110,17 +2110,18 @@ static int validate_unlock_args(struct dlm_lkb *lkb, struct dlm_args *args)
/* an lkb may be waiting for an rsb lookup to complete where the
lookup was initiated by another lock */
if (args->flags & (DLM_LKF_CANCEL | DLM_LKF_FORCEUNLOCK)) {
if (!list_empty(&lkb->lkb_rsb_lookup)) {
if (!list_empty(&lkb->lkb_rsb_lookup)) {
if (args->flags & (DLM_LKF_CANCEL | DLM_LKF_FORCEUNLOCK)) {
log_debug(ls, "unlock on rsb_lookup %x", lkb->lkb_id);
list_del_init(&lkb->lkb_rsb_lookup);
queue_cast(lkb->lkb_resource, lkb,
args->flags & DLM_LKF_CANCEL ?
-DLM_ECANCEL : -DLM_EUNLOCK);
unhold_lkb(lkb); /* undoes create_lkb() */
rv = -EBUSY;
goto out;
}
/* caller changes -EBUSY to 0 for CANCEL and FORCEUNLOCK */
rv = -EBUSY;
goto out;
}
/* cancel not allowed with another cancel/unlock in progress */