Author: kib
Date: Wed Feb 29 15:18:04 2012
New Revision: 232304
URL: http://svn.freebsd.org/changeset/base/232304
Log:
Document that null_nodeget() cannot take shared-locked lowervp due to
insmntque() requirements.
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 Wed Feb 29 15:15:36 2012
(r232303)
+++ head/sys/fs/nullfs/null_subr.c Wed Feb 29 15:18:04 2012
(r232304)
@@ -209,7 +209,11 @@ null_nodeget(mp, lowervp, vpp)
struct vnode *vp;
int error;
- ASSERT_VOP_LOCKED(lowervp, "lowervp");
+ /*
+ * The insmntque1() call below requires the exclusive lock on
+ * the nullfs vnode.
+ */
+ ASSERT_VOP_ELOCKED(lowervp, "lowervp");
KASSERT(lowervp->v_usecount >= 1, ("Unreferenced vnode %p\n", lowervp));
/* Lookup the hash firstly */
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