do_{loopback,change_type,remount,reconfigure_mnt}(): constify struct path argument

Reviewed-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Author: Al Viro

fs/namespace.c

@@ -2908,7 +2908,7 @@ static int flags_to_propagation_type(int ms_flags)
 /*
  * recursively change the type of the mountpoint.
  */
-static int do_change_type(struct path *path, int ms_flags)
+static int do_change_type(const struct path *path, int ms_flags)
 {
 	struct mount *m;
 	struct mount *mnt = real_mount(path->mnt);
@@ -3028,8 +3028,8 @@ static struct mount *__do_loopback(struct path *old_path, int recurse)
 /*
  * do loopback mount.
  */
-static int do_loopback(struct path *path, const char *old_name,
-				int recurse)
+static int do_loopback(const struct path *path, const char *old_name,
+		       int recurse)
 {
 	struct path old_path __free(path_put) = {};
 	struct mount *mnt = NULL;
@@ -3259,7 +3259,7 @@ static void mnt_warn_timestamp_expiry(const struct path *mountpoint,
  * superblock it refers to.  This is triggered by specifying MS_REMOUNT|MS_BIND
  * to mount(2).
  */
-static int do_reconfigure_mnt(struct path *path, unsigned int mnt_flags)
+static int do_reconfigure_mnt(const struct path *path, unsigned int mnt_flags)
 {
 	struct super_block *sb = path->mnt->mnt_sb;
 	struct mount *mnt = real_mount(path->mnt);
@@ -3296,7 +3296,7 @@ static int do_reconfigure_mnt(struct path *path, unsigned int mnt_flags)
  * If you've mounted a non-root directory somewhere and want to do remount
  * on it - tough luck.
  */
-static int do_remount(struct path *path, int ms_flags, int sb_flags,
+static int do_remount(const struct path *path, int ms_flags, int sb_flags,
 		      int mnt_flags, void *data)
 {
 	int err;