Index: head/sys/kern/vfs_subr.c
===================================================================
--- head/sys/kern/vfs_subr.c
+++ head/sys/kern/vfs_subr.c
@@ -4040,7 +4040,7 @@
 /*
  * Print out a description of a vnode.
  */
-static char *typename[] =
+static const char * const typename[] =
 {"VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD",
  "VMARKER"};
 
Index: head/sys/kern/vfs_vnops.c
===================================================================
--- head/sys/kern/vfs_vnops.c
+++ head/sys/kern/vfs_vnops.c
@@ -1566,7 +1566,8 @@
  * permits vn_lock to return doomed vnodes.
  */
 static int __noinline
-_vn_lock_fallback(struct vnode *vp, int flags, char *file, int line, int error)
+_vn_lock_fallback(struct vnode *vp, int flags, const char *file, int line,
+    int error)
 {
 
 	KASSERT((flags & LK_RETRY) == 0 || error == 0,
@@ -1602,7 +1603,7 @@
 }
 
 int
-_vn_lock(struct vnode *vp, int flags, char *file, int line)
+_vn_lock(struct vnode *vp, int flags, const char *file, int line)
 {
 	int error;
 
Index: head/sys/kern/vnode_if.src
===================================================================
--- head/sys/kern/vnode_if.src
+++ head/sys/kern/vnode_if.src
@@ -380,7 +380,7 @@
 vop_lock1 {
 	IN struct vnode *vp;
 	IN int flags;
-	IN char *file;
+	IN const char *file;
 	IN int line;
 };
 
Index: head/sys/sys/vnode.h
===================================================================
--- head/sys/sys/vnode.h
+++ head/sys/sys/vnode.h
@@ -689,7 +689,7 @@
 	    struct thread *fsize_td);
 int	vn_need_pageq_flush(struct vnode *vp);
 int	vn_isdisk(struct vnode *vp, int *errp);
-int	_vn_lock(struct vnode *vp, int flags, char *file, int line);
+int	_vn_lock(struct vnode *vp, int flags, const char *file, int line);
 #define vn_lock(vp, flags) _vn_lock(vp, flags, __FILE__, __LINE__)
 int	vn_open(struct nameidata *ndp, int *flagp, int cmode, struct file *fp);
 int	vn_open_cred(struct nameidata *ndp, int *flagp, int cmode,