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1da177e4 LT |
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 | ||
e18fa700 | 12 | #include <linux/magic.h> |
1da177e4 LT |
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 |