LXR linux/fs/omfs/omfs

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _OMFS_FS_H
   3#define _OMFS_FS_H
   4
   5/* OMFS On-disk structures */
   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_NAMELEN 256
  16#define OMFS_DIR_START 0x1b8
  17#define OMFS_EXTENT_START 0x1d0
  18#define OMFS_EXTENT_CONT 0x40
  19#define OMFS_XOR_COUNT 19
  20#define OMFS_MAX_BLOCK_SIZE 8192
  21#define OMFS_MAX_CLUSTER_SIZE 8
  22#define OMFS_MAX_BLOCKS (1ul << 31)
  23
  24struct omfs_super_block {
  25        char s_fill1[256];
  26        __be64 s_root_block;            /* block number of omfs_root_block */
  27        __be64 s_num_blocks;            /* total number of FS blocks */
  28        __be32 s_magic;                 /* OMFS_MAGIC */
  29        __be32 s_blocksize;             /* size of a block */
  30        __be32 s_mirrors;               /* # of mirrors of system blocks */
  31        __be32 s_sys_blocksize;         /* size of non-data blocks */
  32};
  33
  34struct omfs_header {
  35        __be64 h_self;                  /* FS block where this is located */
  36        __be32 h_body_size;             /* size of useful data after header */
  37        __be16 h_crc;                   /* crc-ccitt of body_size bytes */
  38        char h_fill1[2];
  39        u8 h_version;                   /* version, always 1 */
  40        char h_type;                    /* OMFS_INODE_X */
  41        u8 h_magic;                     /* OMFS_IMAGIC */
  42        u8 h_check_xor;                 /* XOR of header bytes before this */
  43        __be32 h_fill2;
  44};
  45
  46struct omfs_root_block {
  47        struct omfs_header r_head;      /* header */
  48        __be64 r_fill1;
  49        __be64 r_num_blocks;            /* total number of FS blocks */
  50        __be64 r_root_dir;              /* block # of root directory */
  51        __be64 r_bitmap;                /* block # of free space bitmap */
  52        __be32 r_blocksize;             /* size of a block */
  53        __be32 r_clustersize;           /* size allocated for data blocks */
  54        __be64 r_mirrors;               /* # of mirrors of system blocks */
  55        char r_name[OMFS_NAMELEN];      /* partition label */
  56};
  57
  58struct omfs_inode {
  59        struct omfs_header i_head;      /* header */
  60        __be64 i_parent;                /* parent containing this inode */
  61        __be64 i_sibling;               /* next inode in hash bucket */
  62        __be64 i_ctime;                 /* ctime, in milliseconds */
  63        char i_fill1[35];
  64        char i_type;                    /* OMFS_[DIR,FILE] */
  65        __be32 i_fill2;
  66        char i_fill3[64];
  67        char i_name[OMFS_NAMELEN];      /* filename */
  68        __be64 i_size;                  /* size of file, in bytes */
  69};
  70
  71struct omfs_extent_entry {
  72        __be64 e_cluster;               /* start location of a set of blocks */
  73        __be64 e_blocks;                /* number of blocks after e_cluster */
  74};
  75
  76struct omfs_extent {
  77        __be64 e_next;                  /* next extent table location */
  78        __be32 e_extent_count;          /* total # extents in this table */
  79        __be32 e_fill;
  80        struct omfs_extent_entry e_entry;       /* start of extent entries */
  81};
  82
  83#endif
  84