Author: kib
Date: Wed Mar 7 08:08:36 2012
New Revision: 232647
URL: http://svn.freebsd.org/changeset/base/232647
Log:
MFC r232304:
Document that null_nodeget() cannot take shared-locked lowervp due to
insmntque() requirements.
Modified:
stable/9/sys/fs/nullfs/null_subr.c
Directory Properties:
stable/9/sys/ (props changed)
Modified: stable/9/sys/fs/nullfs/null_subr.c
==============================================================================
--- stable/9/sys/fs/nullfs/null_subr.c Wed Mar 7 08:07:28 2012
(r232646)
+++ stable/9/sys/fs/nullfs/null_subr.c Wed Mar 7 08:08:36 2012
(r232647)
@@ -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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