fs/omfs/omfs_fs.h

   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
  22 struct 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
  32 struct 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
  44 struct 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
  56 struct 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
  69 struct 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
  74 struct 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