linux/fs/omfs/omfs_fs.h
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   1#ifndef _OMFS_FS_H
   2#define _OMFS_FS_H
   3
   4/* OMFS On-disk structures */
   5
   6#define OMFS_MAGIC 0xC2993D87
   7#define OMFS_IMAGIC 0xD2
   8
   9#define OMFS_DIR 'D'
  10#define OMFS_FILE 'F'
  11#define OMFS_INODE_NORMAL 'e'
  12#define OMFS_INODE_CONTINUATION 'c'
  13#define OMFS_INODE_SYSTEM 's'
  14#define OMFS_NAMELEN 256
  15#define OMFS_DIR_START 0x1b8
  16#define OMFS_EXTENT_START 0x1d0
  17#define OMFS_EXTENT_CONT 0x40
  18#define OMFS_XOR_COUNT 19
  19#define OMFS_MAX_BLOCK_SIZE 8192
  20#define OMFS_MAX_CLUSTER_SIZE 8
  21
  22struct omfs_super_block {
  23        char s_fill1[256];
  24        __be64 s_root_block;            /* block number of omfs_root_block */
  25        __be64 s_num_blocks;            /* total number of FS blocks */
  26        __be32 s_magic;                 /* OMFS_MAGIC */
  27        __be32 s_blocksize;             /* size of a block */
  28        __be32 s_mirrors;               /* # of mirrors of system blocks */
  29        __be32 s_sys_blocksize;         /* size of non-data blocks */
  30};
  31
  32struct omfs_header {
  33        __be64 h_self;                  /* FS block where this is located */
  34        __be32 h_body_size;             /* size of useful data after header */
  35        __be16 h_crc;                   /* crc-ccitt of body_size bytes */
  36        char h_fill1[2];
  37        u8 h_version;                   /* version, always 1 */
  38        char h_type;                    /* OMFS_INODE_X */
  39        u8 h_magic;                     /* OMFS_IMAGIC */
  40        u8 h_check_xor;                 /* XOR of header bytes before this */
  41        __be32 h_fill2;
  42};
  43
  44struct omfs_root_block {
  45        struct omfs_header r_head;      /* header */
  46        __be64 r_fill1;
  47        __be64 r_num_blocks;            /* total number of FS blocks */
  48        __be64 r_root_dir;              /* block # of root directory */
  49        __be64 r_bitmap;                /* block # of free space bitmap */
  50        __be32 r_blocksize;             /* size of a block */
  51        __be32 r_clustersize;           /* size allocated for data blocks */
  52        __be64 r_mirrors;               /* # of mirrors of system blocks */
  53        char r_name[OMFS_NAMELEN];      /* partition label */
  54};
  55
  56struct omfs_inode {
  57        struct omfs_header i_head;      /* header */
  58        __be64 i_parent;                /* parent containing this inode */
  59        __be64 i_sibling;               /* next inode in hash bucket */
  60        __be64 i_ctime;                 /* ctime, in milliseconds */
  61        char i_fill1[35];
  62        char i_type;                    /* OMFS_[DIR,FILE] */
  63        __be32 i_fill2;
  64        char i_fill3[64];
  65        char i_name[OMFS_NAMELEN];      /* filename */
  66        __be64 i_size;                  /* size of file, in bytes */
  67};
  68
  69struct omfs_extent_entry {
  70        __be64 e_cluster;               /* start location of a set of blocks */
  71        __be64 e_blocks;                /* number of blocks after e_cluster */
  72};
  73
  74struct omfs_extent {
  75        __be64 e_next;                  /* next extent table location */
  76        __be32 e_extent_count;          /* total # extents in this table */
  77        __be32 e_fill;
  78        struct omfs_extent_entry e_entry;       /* start of extent entries */
  79};
  80
  81#endif
  82
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