linux/include/linux/efs_vh.h
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   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * efs_vh.h
   4 *
   5 * Copyright (c) 1999 Al Smith
   6 *
   7 * Portions derived from IRIX header files (c) 1985 MIPS Computer Systems, Inc.
   8 */
   9
  10#ifndef __EFS_VH_H__
  11#define __EFS_VH_H__
  12
  13#define VHMAGIC         0xbe5a941       /* volume header magic number */
  14#define NPARTAB         16              /* 16 unix partitions */
  15#define NVDIR           15              /* max of 15 directory entries */
  16#define BFNAMESIZE      16              /* max 16 chars in boot file name */
  17#define VDNAMESIZE      8
  18
  19struct volume_directory {
  20        char    vd_name[VDNAMESIZE];    /* name */
  21        __be32  vd_lbn;                 /* logical block number */
  22        __be32  vd_nbytes;              /* file length in bytes */
  23};
  24
  25struct partition_table {        /* one per logical partition */
  26        __be32  pt_nblks;       /* # of logical blks in partition */
  27        __be32  pt_firstlbn;    /* first lbn of partition */
  28        __be32  pt_type;        /* use of partition */
  29};
  30
  31struct volume_header {
  32        __be32  vh_magic;                       /* identifies volume header */
  33        __be16  vh_rootpt;                      /* root partition number */
  34        __be16  vh_swappt;                      /* swap partition number */
  35        char    vh_bootfile[BFNAMESIZE];        /* name of file to boot */
  36        char    pad[48];                        /* device param space */
  37        struct volume_directory vh_vd[NVDIR];   /* other vol hdr contents */
  38        struct partition_table  vh_pt[NPARTAB]; /* device partition layout */
  39        __be32  vh_csum;                        /* volume header checksum */
  40        __be32  vh_fill;                        /* fill out to 512 bytes */
  41};
  42
  43/* partition type sysv is used for EFS format CD-ROM partitions */
  44#define SGI_SYSV        0x05
  45#define SGI_EFS         0x07
  46#define IS_EFS(x)       (((x) == SGI_EFS) || ((x) == SGI_SYSV))
  47
  48struct pt_types {
  49        int     pt_type;
  50        char    *pt_name;
  51};
  52
  53#endif /* __EFS_VH_H__ */
  54
  55