include/linux/efs_fs_sb.h

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