Author: kib
Date: Fri Mar 2 09:48:46 2012
New Revision: 232383
URL: http://svn.freebsd.org/changeset/base/232383
Log:
Do not expose unlocked unconstructed nullfs vnode on mount list.
Lock the native nullfs vnode lock before switching the locks.
Tested by: pho
MFC after: 1 week
Modified:
head/sys/fs/nullfs/null_subr.c
Modified: head/sys/fs/nullfs/null_subr.c
==============================================================================
--- head/sys/fs/nullfs/null_subr.c Fri Mar 2 09:30:54 2012
(r232382)
+++ head/sys/fs/nullfs/null_subr.c Fri Mar 2 09:48:46 2012
(r232383)
@@ -172,12 +172,12 @@ static void
null_destroy_proto(struct vnode *vp, void *xp)
{
+ lockmgr(&vp->v_lock, LK_EXCLUSIVE, NULL);
VI_LOCK(vp);
vp->v_data = NULL;
vp->v_vnlock = &vp->v_lock;
vp->v_op = &dead_vnodeops;
VI_UNLOCK(vp);
- (void) vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
vgone(vp);
vput(vp);
free(xp, M_NULLFSNODE);
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