Author: kib
Date: Sun May 24 12:33:16 2009
New Revision: 192683
URL: http://svn.freebsd.org/changeset/base/192683
Log:
In lf_advlockasync(), recheck for doomed vnode after the state->ls_lock
is acquired. In the lf_purgelocks(), assert that vnode is doomed and set
*statep to NULL before clearing ls_pending list. Otherwise, we allow for
the thread executing lf_advlockasync() to put new pending entry after
state->ls_lock is dropped in lf_purgelocks().
Reviewed by: dfr
Tested by: pho
MFC after: 1 month
Modified:
head/sys/kern/kern_lockf.c
Modified: head/sys/kern/kern_lockf.c
==============================================================================
--- head/sys/kern/kern_lockf.c Sun May 24 12:32:03 2009 (r192682)
+++ head/sys/kern/kern_lockf.c Sun May 24 12:33:16 2009 (r192683)
@@ -633,7 +633,20 @@ lf_advlockasync(struct vop_advlockasync_
}
sx_xlock(&state->ls_lock);
- switch(ap->a_op) {
+ /*
+ * Recheck the doomed vnode after state->ls_lock is
+ * locked. lf_purgelocks() requires that no new threads add
+ * pending locks when vnode is marked by VI_DOOMED flag.
+ */
+ VI_LOCK(vp);
+ if (vp->v_iflag & VI_DOOMED) {
+ VI_UNLOCK(vp);
+ lf_free_lock(lock);
+ return (ENOENT);
+ }
+ VI_UNLOCK(vp);
+
+ switch (ap->a_op) {
case F_SETLK:
error = lf_setlock(state, lock, vp, ap->a_cookiep);
break;
@@ -755,8 +768,11 @@ lf_purgelocks(struct vnode *vp, struct l
* the remaining locks.
*/
VI_LOCK(vp);
+ KASSERT(vp->v_iflag & VI_DOOMED,
+ ("lf_purgelocks: vp %p has not vgone yet", vp));
state = *statep;
if (state) {
+ *statep = NULL;
state->ls_threads++;
VI_UNLOCK(vp);
@@ -789,7 +805,6 @@ lf_purgelocks(struct vnode *vp, struct l
VI_LOCK(vp);
while (state->ls_threads > 1)
msleep(state, VI_MTX(vp), 0, "purgelocks", 0);
- *statep = 0;
VI_UNLOCK(vp);
/*
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