omfs.h

   1 #ifndef _OMFS_H
   2 #define _OMFS_H
   3
   4 #include "config.h"
   5 #include <stdio.h>
   6
   7 #define OMFS_MAGIC 0xC2993D87
   8 #define OMFS_IMAGIC 0xD2
   9
  10 #define OMFS_DIR 'D'
  11 #define OMFS_FILE 'F'
  12 #define OMFS_INODE_NORMAL 'e'
  13 #define OMFS_INODE_CONTINUATION 'c'
  14 #define OMFS_INODE_SYSTEM 's'
  15 #define OMFS_SUPER_NAMELEN 64
  16 #define OMFS_NAMELEN 256
  17 #define OMFS_DIR_START 0x1b8
  18 #define OMFS_EXTENT_START 0x1d0
  19 #define OMFS_EXTENT_CONT 0x40
  20 #define OMFS_XOR_COUNT 19
  21
  22
  23 struct omfs_info {
  24         FILE *dev;
  25         struct omfs_super_block *super;
  26         struct omfs_root_block *root;
  27     struct omfs_bitmap *bitmap;
  28         int swap;
  29     pthread_mutex_t dev_mutex;
  30 };
  31
  32 struct omfs_super_block {
  33         char fill1[192];
  34         char name[OMFS_SUPER_NAMELEN];
  35         u64 root_block;
  36         u64 num_blocks;
  37         u32 magic;
  38         u32 blocksize;
  39         u32 mirrors;
  40         u32 sys_blocksize;
  41 };
  42
  43 struct omfs_header {
  44         u64 self;
  45         u32 body_size;
  46         u16 crc;
  47         char fill1[2];
  48         u8 version;
  49         char type;
  50         u8 magic;
  51         u8 check_xor;
  52         u32 fill2;
  53 };
  54
  55 struct omfs_root_block {
  56         struct omfs_header head;
  57         u64 fill1;
  58         u64 num_blocks;
  59         u64 root_dir;
  60         u64 bitmap;
  61         u32 blocksize;
  62         u32 clustersize;
  63         u64 mirrors;
  64         char name[OMFS_NAMELEN];
  65         u64 fill2;
  66 };
  67
  68 struct omfs_inode {
  69         struct omfs_header head;
  70         u64 parent;
  71         u64 sibling;
  72         u64 ctime;
  73         char fill1[35];
  74         char type;
  75         u32 one_goes_here;
  76         char fill3[64];
  77         char name[OMFS_NAMELEN];
  78         u64 size;
  79 };
  80
  81 struct omfs_extent_entry {
  82         u64 cluster;
  83         u64 blocks;
  84 };
  85
  86 struct omfs_extent {
  87         u64 next;
  88         u32 extent_count;
  89         u32 fill;
  90         struct omfs_extent_entry entry;
  91 };
  92
  93 struct omfs_bitmap {
  94     u8 *dirty;
  95     u8 *bmap;
  96 };
  97
  98 typedef struct omfs_info omfs_info_t;
  99 typedef struct omfs_header omfs_header_t;
 100 typedef struct omfs_super_block omfs_super_t;
 101 typedef struct omfs_root_block omfs_root_t;
 102 typedef struct omfs_inode omfs_inode_t;
 103
 104 int omfs_read_super(omfs_info_t *info);
 105 int omfs_write_super(omfs_info_t *info);
 106 int omfs_read_root_block(omfs_info_t *info);
 107 int omfs_write_root_block(omfs_info_t *info);
 108 u8 *omfs_get_block(omfs_info_t *info, u64 block);
 109 int omfs_write_block(omfs_info_t *info, u64 block, u8* buf);
 110 void omfs_release_block(u8 *buf);
 111 int omfs_check_crc(u8 *blk);
 112 omfs_inode_t *omfs_get_inode(omfs_info_t *info, u64 block);
 113 int omfs_write_inode(omfs_info_t *info, omfs_inode_t *inode);
 114 void omfs_release_inode(omfs_inode_t *inode);
 115 void omfs_sync(omfs_info_t *info);
 116 int omfs_load_bitmap(omfs_info_t *info);
 117 int omfs_flush_bitmap(omfs_info_t *info);
 118 int omfs_compute_hash(omfs_info_t *info, char *filename);
 119 omfs_inode_t *omfs_new_inode(omfs_info_t *info, u64 block, char *name,
 120     char type);
 121 void omfs_clear_data(omfs_info_t *info, u64 block, int count);
 122
 123 /* bitmap.c */
 124 int omfs_allocate_one_block(omfs_info_t *info, u64 block);
 125 int omfs_allocate_block(omfs_info_t *info, int size, u64 *return_block);
 126 int omfs_clear_range(omfs_info_t *info, u64 start, int count);
 127 unsigned long omfs_count_free(omfs_info_t *info);
 128
 129 #endif