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Do not expose unlocked unconstructed nullfs vnode on mount list.

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Lock the native nullfs vnode lock before switching the locks.

Tested by:	pho
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2012-03-02 09:48:46 +00:00
parent 1e0f75d313
commit 66f02f4b25
1 changed files with 1 additions and 1 deletions
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2
sys/fs/nullfs/null_subr.c
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@ -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);