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