/* * direct.h - NILFS direct block pointer. * * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA * * Written by Koji Sato <koji@osrg.net>. */ #ifndef _NILFS_DIRECT_H #define _NILFS_DIRECT_H #include <linux/types.h> #include <linux/buffer_head.h> #include "bmap.h" struct nilfs_direct; /** * struct nilfs_direct_node - direct node * @dn_flags: flags * @dn_pad: padding */ struct nilfs_direct_node { __u8 dn_flags; __u8 pad[7]; }; /** * struct nilfs_direct - direct mapping * @d_bmap: bmap structure */ struct nilfs_direct { struct nilfs_bmap d_bmap; }; #define NILFS_DIRECT_NBLOCKS (NILFS_BMAP_SIZE / sizeof(__le64) - 1) #define NILFS_DIRECT_KEY_MIN 0 #define NILFS_DIRECT_KEY_MAX (NILFS_DIRECT_NBLOCKS - 1) int nilfs_direct_init(struct nilfs_bmap *); int nilfs_direct_delete_and_convert(struct nilfs_bmap *, __u64, __u64 *, __u64 *, int); #endif /* _NILFS_DIRECT_H */