constify struct path argument of finish_automount()/do_add_mount()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/internal.h

@@ -74,7 +74,7 @@ int do_linkat(int olddfd, struct filename *old, int newdfd,
  * namespace.c
  */
 extern struct vfsmount *lookup_mnt(const struct path *);
-extern int finish_automount(struct vfsmount *, struct path *);
+extern int finish_automount(struct vfsmount *, const struct path *);
 
 extern int sb_prepare_remount_readonly(struct super_block *);
 

fs/namespace.c

@@ -2876,7 +2876,7 @@ static int do_move_mount_old(struct path *path, const char *old_name)
  * add a mount into a namespace's mount tree
  */
 static int do_add_mount(struct mount *newmnt, struct mountpoint *mp,
-			struct path *path, int mnt_flags)
+			const struct path *path, int mnt_flags)
 {
 	struct mount *parent = real_mount(path->mnt);
 
@@ -2999,7 +2999,7 @@ static int do_new_mount(struct path *path, const char *fstype, int sb_flags,
 	return err;
 }
 
-int finish_automount(struct vfsmount *m, struct path *path)
+int finish_automount(struct vfsmount *m, const struct path *path)
 {
 	struct dentry *dentry = path->dentry;
 	struct mountpoint *mp;