/* SPDX-License-Identifier: GPL-2.0 */
  /*
   * 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__ */