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 
55