efs_vh.h

unxi下共享内存的使用

/*
 * efs_vh.h
 *
 * Copyright (c) 1999 Al Smith
 *
 * Portions derived from IRIX header files (c) 1985 MIPS Computer Systems, Inc.
 */

#ifndef __EFS_VH_H__
#define __EFS_VH_H__

#define VHMAGIC		0xbe5a941	/* volume header magic number */
#define NPARTAB		16		/* 16 unix partitions */
#define NVDIR		15		/* max of 15 directory entries */
#define BFNAMESIZE	16		/* max 16 chars in boot file name */
#define VDNAMESIZE	8

struct volume_directory {
	char	vd_name[VDNAMESIZE];	/* name */
	int	vd_lbn;			/* logical block number */
	int	vd_nbytes;		/* file length in bytes */
};

struct partition_table {	/* one per logical partition */
	int	pt_nblks;	/* # of logical blks in partition */
	int	pt_firstlbn;	/* first lbn of partition */
	int	pt_type;	/* use of partition */
};

struct volume_header {
	int	vh_magic;			/* identifies volume header */
	short	vh_rootpt;			/* root partition number */
	short	vh_swappt;			/* swap partition number */
	char	vh_bootfile[BFNAMESIZE];	/* name of file to boot */
	char	pad[48];			/* device param space */
	struct volume_directory vh_vd[NVDIR];	/* other vol hdr contents */
	struct partition_table  vh_pt[NPARTAB];	/* device partition layout */
	int	vh_csum;			/* volume header checksum */
	int	vh_fill;			/* fill out to 512 bytes */
};

/* partition type sysv is used for EFS format CD-ROM partitions */
#define SGI_SYSV	0x05
#define SGI_EFS		0x07
#define IS_EFS(x)	(((x) == SGI_EFS) || ((x) == SGI_SYSV))

struct pt_types {
	int	pt_type;
	char	*pt_name;
} sgi_pt_types[] = {
	{0x00,		"SGI vh"},
	{0x01,		"SGI trkrepl"},
	{0x02,		"SGI secrepl"},
	{0x03,		"SGI raw"},
	{0x04,		"SGI bsd"},
	{SGI_SYSV,	"SGI sysv"},
	{0x06,		"SGI vol"},
	{SGI_EFS,	"SGI efs"},
	{0x08,		"SGI lv"},
	{0x09,		"SGI rlv"},
	{0x0A,		"SGI xfs"},
	{0x0B,		"SGI xfslog"},
	{0x0C,		"SGI xlv"},
	{0x82,		"Linux swap"},
	{0x83,		"Linux native"},
	{0,		NULL}
};

#endif /* __EFS_VH_H__ */