fs/nilfs2/direct.h

   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  * Written by Koji Sato.
  17  */
  18
  19 #ifndef _NILFS_DIRECT_H
  20 #define _NILFS_DIRECT_H
  21
  22 #include <linux/types.h>
  23 #include <linux/buffer_head.h>
  24 #include "bmap.h"
  25
  26
  27 /**
  28  * struct nilfs_direct_node - direct node
  29  * @dn_flags: flags
  30  * @dn_pad: padding
  31  */
  32 struct nilfs_direct_node {
  33         __u8 dn_flags;
  34         __u8 pad[7];
  35 };
  36
  37 #define NILFS_DIRECT_NBLOCKS    (NILFS_BMAP_SIZE / sizeof(__le64) - 1)
  38 #define NILFS_DIRECT_KEY_MIN    0
  39 #define NILFS_DIRECT_KEY_MAX    (NILFS_DIRECT_NBLOCKS - 1)
  40
  41
  42 int nilfs_direct_init(struct nilfs_bmap *);
  43 int nilfs_direct_delete_and_convert(struct nilfs_bmap *, __u64, __u64 *,
  44                                     __u64 *, int);
  45
  46
  47 #endif  /* _NILFS_DIRECT_H */