efs_vh.h

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/*
 * 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__ */