root/include/linux/efs_vh.h

INCLUDED FROM

/*
 * 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 */
        __be32  vd_lbn;                 /* logical block number */
        __be32  vd_nbytes;              /* file length in bytes */
};

struct partition_table {        /* one per logical partition */
        __be32  pt_nblks;       /* # of logical blks in partition */
        __be32  pt_firstlbn;    /* first lbn of partition */
        __be32  pt_type;        /* use of partition */
};

struct volume_header {
        __be32  vh_magic;                       /* identifies volume header */
        __be16  vh_rootpt;                      /* root partition number */
        __be16  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 */
        __be32  vh_csum;                        /* volume header checksum */
        __be32  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;
};

#endif /* __EFS_VH_H__ */