namespace.c: constify struct path passed to a bunch of primitives

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

fs/internal.h

@@ -62,7 +62,7 @@ extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
 extern void *copy_mount_options(const void __user *);
 extern char *copy_mount_string(const void __user *);
 
-extern struct vfsmount *lookup_mnt(struct path *);
+extern struct vfsmount *lookup_mnt(const struct path *);
 extern int finish_automount(struct vfsmount *, struct path *);
 
 extern int sb_prepare_remount_readonly(struct super_block *);

fs/namespace.c

@@ -678,7 +678,7 @@ out:
  *
  * lookup_mnt takes a reference to the found vfsmount.
  */
-struct vfsmount *lookup_mnt(struct path *path)
+struct vfsmount *lookup_mnt(const struct path *path)
 {
 	struct mount *child_mnt;
 	struct vfsmount *m;
@@ -1159,7 +1159,7 @@ struct vfsmount *mntget(struct vfsmount *mnt)
 }
 EXPORT_SYMBOL(mntget);
 
-struct vfsmount *mnt_clone_internal(struct path *path)
+struct vfsmount *mnt_clone_internal(const struct path *path)
 {
 	struct mount *p;
 	p = clone_mnt(real_mount(path->mnt), path->dentry, CL_PRIVATE);
@@ -1758,7 +1758,7 @@ out:
 
 /* Caller should check returned pointer for errors */
 
-struct vfsmount *collect_mounts(struct path *path)
+struct vfsmount *collect_mounts(const struct path *path)
 {
 	struct mount *tree;
 	namespace_lock();
@@ -1791,7 +1791,7 @@ void drop_collected_mounts(struct vfsmount *mnt)
  *
  * Release with mntput().
  */
-struct vfsmount *clone_private_mount(struct path *path)
+struct vfsmount *clone_private_mount(const struct path *path)
 {
 	struct mount *old_mnt = real_mount(path->mnt);
 	struct mount *new_mnt;

include/linux/fs.h

@@ -2123,7 +2123,7 @@ extern int may_umount_tree(struct vfsmount *);
 extern int may_umount(struct vfsmount *);
 extern long do_mount(const char *, const char __user *,
 		     const char *, unsigned long, void *);
-extern struct vfsmount *collect_mounts(struct path *);
+extern struct vfsmount *collect_mounts(const struct path *);
 extern void drop_collected_mounts(struct vfsmount *);
 extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *,
 			  struct vfsmount *);

include/linux/mount.h

@@ -79,12 +79,12 @@ extern void mnt_drop_write(struct vfsmount *mnt);
 extern void mnt_drop_write_file(struct file *file);
 extern void mntput(struct vfsmount *mnt);
 extern struct vfsmount *mntget(struct vfsmount *mnt);
-extern struct vfsmount *mnt_clone_internal(struct path *path);
+extern struct vfsmount *mnt_clone_internal(const struct path *path);
 extern int __mnt_is_readonly(struct vfsmount *mnt);
 extern bool mnt_may_suid(struct vfsmount *mnt);
 
 struct path;
-extern struct vfsmount *clone_private_mount(struct path *path);
+extern struct vfsmount *clone_private_mount(const struct path *path);
 
 struct file_system_type;
 extern struct vfsmount *vfs_kern_mount(struct file_system_type *type,