linux/include/linux/efs_vh.h
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   1/*
   2 * efs_vh.h
   3 *
   4 * Copyright (c) 1999 Al Smith
   5 *
   6 * Portions derived from IRIX header files (c) 1985 MIPS Computer Systems, Inc.
   7 */
   8
   9#ifndef __EFS_VH_H__
  10#define __EFS_VH_H__
  11
  12#define VHMAGIC         0xbe5a941       /* volume header magic number */
  13#define NPARTAB         16              /* 16 unix partitions */
  14#define NVDIR           15              /* max of 15 directory entries */
  15#define BFNAMESIZE      16              /* max 16 chars in boot file name */
  16#define VDNAMESIZE      8
  17
  18struct volume_directory {
  19        char    vd_name[VDNAMESIZE];    /* name */
  20        __be32  vd_lbn;                 /* logical block number */
  21        __be32  vd_nbytes;              /* file length in bytes */
  22};
  23
  24struct partition_table {        /* one per logical partition */
  25        __be32  pt_nblks;       /* # of logical blks in partition */
  26        __be32  pt_firstlbn;    /* first lbn of partition */
  27        __be32  pt_type;        /* use of partition */
  28};
  29
  30struct volume_header {
  31        __be32  vh_magic;                       /* identifies volume header */
  32        __be16  vh_rootpt;                      /* root partition number */
  33        __be16  vh_swappt;                      /* swap partition number */
  34        char    vh_bootfile[BFNAMESIZE];        /* name of file to boot */
  35        char    pad[48];                        /* device param space */
  36        struct volume_directory vh_vd[NVDIR];   /* other vol hdr contents */
  37        struct partition_table  vh_pt[NPARTAB]; /* device partition layout */
  38        __be32  vh_csum;                        /* volume header checksum */
  39        __be32  vh_fill;                        /* fill out to 512 bytes */
  40};
  41
  42/* partition type sysv is used for EFS format CD-ROM partitions */
  43#define SGI_SYSV        0x05
  44#define SGI_EFS         0x07
  45#define IS_EFS(x)       (((x) == SGI_EFS) || ((x) == SGI_SYSV))
  46
  47struct pt_types {
  48        int     pt_type;
  49        char    *pt_name;
  50};
  51
  52#endif /* __EFS_VH_H__ */
  53
  54
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