.alloc_inode    = nilfs_alloc_inode,
        .destroy_inode  = nilfs_destroy_inode,
        .dirty_inode    = nilfs_dirty_inode,
-       /* .write_inode    = nilfs_write_inode, */
-       /* .drop_inode    = nilfs_drop_inode, */
        .evict_inode    = nilfs_evict_inode,
        .put_super      = nilfs_put_super,
-       /* .write_super    = nilfs_write_super, */
        .sync_fs        = nilfs_sync_fs,
        .freeze_fs      = nilfs_freeze,
        .unfreeze_fs    = nilfs_unfreeze,
        .statfs         = nilfs_statfs,
        .remount_fs     = nilfs_remount,
-       /* .umount_begin */
        .show_options = nilfs_show_options
 };
 
 
         * used for
         * - loading the latest checkpoint exclusively.
         * - allocating a new full segment.
-        * - protecting s_dirt in the super_block struct
-        *   (see nilfs_write_super) and the following fields.
         */
        struct buffer_head     *ns_sbh[2];
        struct nilfs_super_block *ns_sbp[2];