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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 
18 struct 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 
24 struct 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 
30 struct 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 
47 struct pt_types {
48 	int	pt_type;
49 	char	*pt_name;
50 };
51 
52 #endif /* __EFS_VH_H__ */
53 
54