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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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