--- include/linux/fs.h

+++ include/linux/fs.h

@@ -1310,6 +1310,8 @@ extern int send_sigurg(struct fown_struc

#define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */

#define MNT_DETACH 0x00000002 /* Just detach from the tree */

#define MNT_EXPIRE 0x00000004 /* Mark for expiry */

+#define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */

+#define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */

extern struct list_head super_blocks;

extern spinlock_t sb_lock;