include/linux/efs_vh.h

   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
  19 struct 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
  25 struct 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
  31 struct 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
  48 struct pt_types {
  49         int     pt_type;
  50         char    *pt_name;
  51 };
  52
  53 #endif /* __EFS_VH_H__ */
  54