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01: /*
02:  * efs_fs_sb.h
03:  *
04:  * Copyright (c) 1999 Al Smith
05:  *
06:  * Portions derived from IRIX header files (c) 1988 Silicon Graphics
07:  */
08: 
09: #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 */
25: struct 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 */
49: struct 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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