diff -ur /usr/src/sys/fs/hpfs/hpfs_vfsops.c src/sys/fs/hpfs/hpfs_vfsops.c
--- /usr/src/sys/fs/hpfs/hpfs_vfsops.c	Sat Sep  3 09:54:39 2005
+++ src/sys/fs/hpfs/hpfs_vfsops.c	Sat Sep  3 10:41:34 2005
@@ -231,7 +231,6 @@
 		return (EOPNOTSUPP);
 	dprintf(("hpfs_mountfs():\n"));
 	ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
-	vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
 	/* XXX: use VOP_ACCESS to check FS perms */
 	DROP_GIANT();
 	g_topology_lock();
diff -ur /usr/src/sys/fs/ntfs/ntfs_vfsops.c src/sys/fs/ntfs/ntfs_vfsops.c
--- /usr/src/sys/fs/ntfs/ntfs_vfsops.c	Sat Sep  3 09:54:39 2005
+++ src/sys/fs/ntfs/ntfs_vfsops.c	Sat Sep  3 10:43:26 2005
@@ -272,7 +272,6 @@
 	char *cs_ntfs, *cs_local;
 
 	ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
-	vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
 	DROP_GIANT();
 	g_topology_lock();
 	error = g_vfs_open(devvp, &cp, "ntfs", ronly ? 0 : 1);
diff -ur /usr/src/sys/fs/udf/udf_vfsops.c src/sys/fs/udf/udf_vfsops.c
--- /usr/src/sys/fs/udf/udf_vfsops.c	Sat Sep  3 09:54:39 2005
+++ src/sys/fs/udf/udf_vfsops.c	Sat Sep  3 10:44:10 2005
@@ -323,7 +323,6 @@
 	struct g_consumer *cp;
 	struct bufobj *bo;
 
-	vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
 	DROP_GIANT();
 	g_topology_lock();
 	error = g_vfs_open(devvp, &cp, "udf", 0);
diff -ur /usr/src/sys/gnu/fs/ext2fs/ext2_vfsops.c src/sys/gnu/fs/ext2fs/ext2_vfsops.c
--- /usr/src/sys/gnu/fs/ext2fs/ext2_vfsops.c	Sat Sep  3 09:54:44 2005
+++ src/sys/gnu/fs/ext2fs/ext2_vfsops.c	Sat Sep  3 18:24:33 2005
@@ -276,9 +276,10 @@
 	if ((mp->mnt_flag & MNT_UPDATE) == 0) {
 		error = ext2_mountfs(devvp, mp, td);
 	} else {
-		if (devvp != ump->um_devvp)
-			error = EINVAL;	/* needs translation */
-		else
+		if (devvp != ump->um_devvp) {
+			vput(devvp);
+			return (EINVAL);	/* needs translation */
+		} else
 			vput(devvp);
 	}
 	if (error) {
diff -ur /usr/src/sys/gnu/fs/reiserfs/reiserfs_vfsops.c src/sys/gnu/fs/reiserfs/reiserfs_vfsops.c
--- /usr/src/sys/gnu/fs/reiserfs/reiserfs_vfsops.c	Sat Sep  3 09:54:44 2005
+++ src/sys/gnu/fs/reiserfs/reiserfs_vfsops.c	Sat Sep  3 18:22:08 2005
@@ -142,7 +142,8 @@
 		error = reiserfs_mountfs(devvp, mp, td);
 	} else {
 		/* TODO Handle MNT_UPDATE */
-		error = (EOPNOTSUPP);
+		vput(devvp);
+		return (EOPNOTSUPP);
 	}
 
 	if (error) {
@@ -471,7 +472,6 @@
 	if (vcount(devvp) > 1)
 		return (EBUSY);
 
-	vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
 	error = vinvalbuf(devvp, V_SAVE, td->td_ucred, td, 0, 0);
 	if (error) {
 		VOP_UNLOCK(devvp, 0, td);