--- linux-2.6.21.i686/fs/nfs/super.c.org
+++ linux-2.6.21.i686/fs/nfs/super.c
@@ -522,6 +522,8 @@ static inline void nfs_initialise_sb(str
 
 	sb->s_magic = NFS_SUPER_MAGIC;
 
+	sb->s_flags |= MS_NO_LEASES;
+
 	/* We probably want something more informative here */
 	snprintf(sb->s_id, sizeof(sb->s_id),
 		 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
--- linux-2.6.21.i686/fs/locks.c.org
+++ linux-2.6.21.i686/fs/locks.c
@@ -1493,6 +1493,8 @@ int fcntl_setlease(unsigned int fd, stru
 	error = security_file_lock(filp, arg);
 	if (error)
 		return error;
+	if (IS_NO_LEASES(inode))
+		return -EINVAL;
 
 	locks_init_lock(&fl);
 	error = lease_init(filp, arg, &fl);
--- linux-2.6.21.i686/include/linux/fs.h.org
+++ linux-2.6.21.i686/include/linux/fs.h
@@ -121,6 +121,7 @@ extern int dir_notify_enable;
 #define MS_SLAVE	(1<<19)	/* change to slave */
 #define MS_SHARED	(1<<20)	/* change to shared */
 #define MS_RELATIME	(1<<21)	/* Update atime relative to mtime/ctime. */
+#define MS_NO_LEASES	(1<<22)	/* fs does not support leases */
 #define MS_ACTIVE	(1<<30)
 #define MS_NOUSER	(1<<31)
 
@@ -180,6 +181,7 @@ extern int dir_notify_enable;
 #define IS_NOCMTIME(inode)	((inode)->i_flags & S_NOCMTIME)
 #define IS_SWAPFILE(inode)	((inode)->i_flags & S_SWAPFILE)
 #define IS_PRIVATE(inode)	((inode)->i_flags & S_PRIVATE)
+#define IS_NO_LEASES(inode)	__IS_FLG(inode, MS_NO_LEASES)
 
 /* the read-only stuff doesn't really belong here, but any other place is
    probably as bad and I don't want to create yet another include file. */