blob: 95476663cdc21e493e267ac34baab568cbb6e63c (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
/*
* 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__
/* statfs() magic number for EFS */
#define EFS_SUPER_MAGIC 0x414A53
/* 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 {
int32_t fs_size; /* size of filesystem, in sectors */
int32_t fs_firstcg; /* bb offset to first cg */
int32_t fs_cgfsize; /* size of cylinder group in bb's */
short fs_cgisize; /* bb's of inodes per cylinder group */
short fs_sectors; /* sectors per track */
short fs_heads; /* heads per cylinder */
short fs_ncg; /* # of cylinder groups in filesystem */
short fs_dirty; /* fs needs to be fsck'd */
short fs_filler; /* force fs_time to start 2bytes later*/
int32_t fs_time; /* last super-block update */
int32_t fs_magic; /* magic number */
char fs_fname[6]; /* file system name */
char fs_fpack[6]; /* file system pack name */
int32_t fs_bmsize; /* size of bitmap in bytes */
int32_t fs_tfree; /* total free data blocks */
int32_t fs_tinode; /* total free inodes */
int32_t fs_bmblock; /* bitmap location. */
int32_t fs_replsb; /* Location of replicated superblock. */
int32_t fs_lastialloc; /* last allocated inode */
char fs_spare[20]; /* space for expansion - MUST BE ZERO */
int32_t fs_checksum; /* checksum of volume portion of fs */
};
/* efs superblock information in memory */
struct efs_sb_info {
int32_t fs_magic; /* superblock magic number */
int32_t fs_start; /* first block of filesystem */
int32_t first_block; /* first data block in filesystem */
int32_t total_blocks; /* total number of blocks in filesystem */
int32_t group_size; /* # of blocks a group consists of */
int32_t data_free; /* # of free data blocks */
int32_t inode_free; /* # of free inodes */
short inode_blocks; /* # of blocks used for inodes in every grp */
short total_groups; /* # of groups */
};
#endif /* __EFS_FS_SB_H__ */
|
