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diff --git a/sys/fs/nullfs/null_vnops.c b/sys/fs/nullfs/null_vnops.c
--- a/sys/fs/nullfs/null_vnops.c
+++ b/sys/fs/nullfs/null_vnops.c
@@ -1127,6 +1127,23 @@
return (res);
}
+static int
+null_getlowvnode(struct vop_getlowvnode_args *ap)
+{
+ struct vnode *vp, *vpl;
+
+ vp = ap->a_vp;
+ if (vn_lock(vp, LK_SHARED) != 0)
+ return (EBADF);
+
+ vpl = NULLVPTOLOWERVP(vp);
+ vhold(vpl);
+ VOP_UNLOCK(vp);
+ VOP_GETLOWVNODE(vpl, ap->a_vplp, ap->a_flags);
+ vdrop(vpl);
+ return (0);
+}
+
/*
* Global vfs data structures
*/
@@ -1139,6 +1156,7 @@
.vop_bmap = VOP_EOPNOTSUPP,
.vop_stat = null_stat,
.vop_getattr = null_getattr,
+ .vop_getlowvnode = null_getlowvnode,
.vop_getwritemount = null_getwritemount,
.vop_inactive = null_inactive,
.vop_need_inactive = null_need_inactive,
diff --git a/sys/kern/vfs_default.c b/sys/kern/vfs_default.c
--- a/sys/kern/vfs_default.c
+++ b/sys/kern/vfs_default.c
@@ -82,6 +82,7 @@
static int vop_stdread_pgcache(struct vop_read_pgcache_args *ap);
static int vop_stdstat(struct vop_stat_args *ap);
static int vop_stdvput_pair(struct vop_vput_pair_args *ap);
+static int vop_stdgetlowvnode(struct vop_getlowvnode_args *ap);
/*
* This vnode table stores what we want to do if the filesystem doesn't
@@ -112,6 +113,7 @@
.vop_fsync = VOP_NULL,
.vop_stat = vop_stdstat,
.vop_fdatasync = vop_stdfdatasync,
+ .vop_getlowvnode = vop_stdgetlowvnode,
.vop_getpages = vop_stdgetpages,
.vop_getpages_async = vop_stdgetpages_async,
.vop_getwritemount = vop_stdgetwritemount,
@@ -1607,3 +1609,11 @@
vput(vp);
return (0);
}
+
+static int
+vop_stdgetlowvnode(struct vop_getlowvnode_args *ap)
+{
+ vref(ap->a_vp);
+ *ap->a_vplp = ap->a_vp;
+ return (0);
+}
diff --git a/sys/kern/vnode_if.src b/sys/kern/vnode_if.src
--- a/sys/kern/vnode_if.src
+++ b/sys/kern/vnode_if.src
@@ -468,6 +468,13 @@
OUT struct mount **mpp;
};
+%% getwritevnode vp = = =
+
+vop_getlowvnode {
+ IN struct vnode *vp;
+ OUT struct vnode **vplp;
+ IN int flags;
+};
%% print vp - - -

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