shmem: convert to simple_rename_timestamp

A rename potentially involves updating 4 different inode timestamps.
Convert to the new simple_rename_timestamp helper function.
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Message-Id: <20230705190309.579783-9-jlayton@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>

mm/shmem.c

@@ -3266,9 +3266,7 @@ static int shmem_rename2(struct mnt_idmap *idmap,
 
 	old_dir->i_size -= BOGO_DIRENT_SIZE;
 	new_dir->i_size += BOGO_DIRENT_SIZE;
-	old_dir->i_ctime = old_dir->i_mtime =
-	new_dir->i_ctime = new_dir->i_mtime =
-	inode->i_ctime = current_time(old_dir);
+	simple_rename_timestamp(old_dir, old_dentry, new_dir, new_dentry);
 	inode_inc_iversion(old_dir);
 	inode_inc_iversion(new_dir);
 	return 0;