linux/include/linux/efs_fs_sb.h
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   1/*
   2 * efs_fs_sb.h
   3 *
   4 * Copyright (c) 1999 Al Smith
   5 *
   6 * Portions derived from IRIX header files (c) 1988 Silicon Graphics
   7 */
   8
   9#ifndef __EFS_FS_SB_H__
  10#define __EFS_FS_SB_H__
  11
  12#include <linux/types.h>
  13#include <linux/magic.h>
  14
  15/* EFS superblock magic numbers */
  16#define EFS_MAGIC       0x072959
  17#define EFS_NEWMAGIC    0x07295a
  18
  19#define IS_EFS_MAGIC(x) ((x == EFS_MAGIC) || (x == EFS_NEWMAGIC))
  20
  21#define EFS_SUPER               1
  22#define EFS_ROOTINODE           2
  23
  24/* efs superblock on disk */
  25struct efs_super {
  26        __be32          fs_size;        /* size of filesystem, in sectors */
  27        __be32          fs_firstcg;     /* bb offset to first cg */
  28        __be32          fs_cgfsize;     /* size of cylinder group in bb's */
  29        __be16          fs_cgisize;     /* bb's of inodes per cylinder group */
  30        __be16          fs_sectors;     /* sectors per track */
  31        __be16          fs_heads;       /* heads per cylinder */
  32        __be16          fs_ncg;         /* # of cylinder groups in filesystem */
  33        __be16          fs_dirty;       /* fs needs to be fsck'd */
  34        __be32          fs_time;        /* last super-block update */
  35        __be32          fs_magic;       /* magic number */
  36        char            fs_fname[6];    /* file system name */
  37        char            fs_fpack[6];    /* file system pack name */
  38        __be32          fs_bmsize;      /* size of bitmap in bytes */
  39        __be32          fs_tfree;       /* total free data blocks */
  40        __be32          fs_tinode;      /* total free inodes */
  41        __be32          fs_bmblock;     /* bitmap location. */
  42        __be32          fs_replsb;      /* Location of replicated superblock. */
  43        __be32          fs_lastialloc;  /* last allocated inode */
  44        char            fs_spare[20];   /* space for expansion - MUST BE ZERO */
  45        __be32          fs_checksum;    /* checksum of volume portion of fs */
  46};
  47
  48/* efs superblock information in memory */
  49struct efs_sb_info {
  50        __u32   fs_magic;       /* superblock magic number */
  51        __u32   fs_start;       /* first block of filesystem */
  52        __u32   first_block;    /* first data block in filesystem */
  53        __u32   total_blocks;   /* total number of blocks in filesystem */
  54        __u32   group_size;     /* # of blocks a group consists of */ 
  55        __u32   data_free;      /* # of free data blocks */
  56        __u32   inode_free;     /* # of free inodes */
  57        __u16   inode_blocks;   /* # of blocks used for inodes in every grp */
  58        __u16   total_groups;   /* # of groups */
  59};
  60
  61#endif /* __EFS_FS_SB_H__ */
  62
  63
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