linux/fs/nilfs2/direct.h
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   1/*
   2 * direct.h - NILFS direct block pointer.
   3 *
   4 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation; either version 2 of the License, or
   9 * (at your option) any later version.
  10 *
  11 * This program is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with this program; if not, write to the Free Software
  18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19 *
  20 * Written by Koji Sato <koji@osrg.net>.
  21 */
  22
  23#ifndef _NILFS_DIRECT_H
  24#define _NILFS_DIRECT_H
  25
  26#include <linux/types.h>
  27#include <linux/buffer_head.h>
  28#include "bmap.h"
  29
  30
  31/**
  32 * struct nilfs_direct_node - direct node
  33 * @dn_flags: flags
  34 * @dn_pad: padding
  35 */
  36struct nilfs_direct_node {
  37        __u8 dn_flags;
  38        __u8 pad[7];
  39};
  40
  41#define NILFS_DIRECT_NBLOCKS    (NILFS_BMAP_SIZE / sizeof(__le64) - 1)
  42#define NILFS_DIRECT_KEY_MIN    0
  43#define NILFS_DIRECT_KEY_MAX    (NILFS_DIRECT_NBLOCKS - 1)
  44
  45
  46int nilfs_direct_init(struct nilfs_bmap *);
  47int nilfs_direct_delete_and_convert(struct nilfs_bmap *, __u64, __u64 *,
  48                                    __u64 *, int);
  49
  50
  51#endif  /* _NILFS_DIRECT_H */
  52
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