/*
   * efs_fs_sb.h
   *
   * Copyright (c) 1999 Al Smith
   *
   * Portions derived from IRIX header files (c) 1988 Silicon Graphics
   */
  
  #ifndef __EFS_FS_SB_H__
  #define __EFS_FS_SB_H__
  
  /* statfs() magic number for EFS */
  #define EFS_SUPER_MAGIC	0x414A53
  
  /* EFS superblock magic numbers */
  #define EFS_MAGIC	0x072959
  #define EFS_NEWMAGIC	0x07295a
  
  #define IS_EFS_MAGIC(x)	((x == EFS_MAGIC) || (x == EFS_NEWMAGIC))
  
  #define EFS_SUPER		1
  #define EFS_ROOTINODE		2
  
  /* efs superblock on disk */
  struct efs_super {
  	__be32		fs_size;        /* size of filesystem, in sectors */
  	__be32		fs_firstcg;     /* bb offset to first cg */
  	__be32		fs_cgfsize;     /* size of cylinder group in bb's */
  	__be16		fs_cgisize;     /* bb's of inodes per cylinder group */
  	__be16		fs_sectors;     /* sectors per track */
  	__be16		fs_heads;       /* heads per cylinder */
  	__be16		fs_ncg;         /* # of cylinder groups in filesystem */
  	__be16		fs_dirty;       /* fs needs to be fsck'd */
  	__be32		fs_time;        /* last super-block update */
  	__be32		fs_magic;       /* magic number */
  	char		fs_fname[6];    /* file system name */
  	char		fs_fpack[6];    /* file system pack name */
  	__be32		fs_bmsize;      /* size of bitmap in bytes */
  	__be32		fs_tfree;       /* total free data blocks */
  	__be32		fs_tinode;      /* total free inodes */
  	__be32		fs_bmblock;     /* bitmap location. */
  	__be32		fs_replsb;      /* Location of replicated superblock. */
  	__be32		fs_lastialloc;  /* last allocated inode */
  	char		fs_spare[20];   /* space for expansion - MUST BE ZERO */
  	__be32		fs_checksum;    /* checksum of volume portion of fs */
  };
  
  /* efs superblock information in memory */
  struct efs_sb_info {
  	__u32	fs_magic;	/* superblock magic number */
  	__u32	fs_start;	/* first block of filesystem */
  	__u32	first_block;	/* first data block in filesystem */
  	__u32	total_blocks;	/* total number of blocks in filesystem */
  	__u32	group_size;	/* # of blocks a group consists of */ 
  	__u32	data_free;	/* # of free data blocks */
  	__u32	inode_free;	/* # of free inodes */
  	__u16	inode_blocks;	/* # of blocks used for inodes in every grp */
  	__u16	total_groups;	/* # of groups */
  };
  
  #endif /* __EFS_FS_SB_H__ */