root/include/linux/efs_fs_sb.h

INCLUDED FROM

/*
 * 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__

#include <linux/magic.h>

/* 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__ */