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
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