1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 /*
3 * efs_fs_sb.h
4 *
5 * Copyright (c) 1999 Al Smith
6 *
7 * Portions derived from IRIX header files (c) 1988 Silicon Graphics
8 */
9
10 #ifndef __EFS_FS_SB_H__
11 #define __EFS_FS_SB_H__
12
13 #include <linux/types.h>
14 #include <linux/magic.h>
15
16 /* EFS superblock magic numbers */
17 #define EFS_MAGIC 0x072959
18 #define EFS_NEWMAGIC 0x07295a
19
20 #define IS_EFS_MAGIC(x) ((x == EFS_MAGIC) || (x == EFS_NEWMAGIC))
21
22 #define EFS_SUPER 1
23 #define EFS_ROOTINODE 2
24
25 /* efs superblock on disk */
26 struct efs_super {
27 __be32 fs_size; /* size of filesystem, in sectors */
28 __be32 fs_firstcg; /* bb offset to first cg */
29 __be32 fs_cgfsize; /* size of cylinder group in bb's */
30 __be16 fs_cgisize; /* bb's of inodes per cylinder group */
31 __be16 fs_sectors; /* sectors per track */
32 __be16 fs_heads; /* heads per cylinder */
33 __be16 fs_ncg; /* # of cylinder groups in filesystem */
34 __be16 fs_dirty; /* fs needs to be fsck'd */
35 __be32 fs_time; /* last super-block update */
36 __be32 fs_magic; /* magic number */
37 char fs_fname[6]; /* file system name */
38 char fs_fpack[6]; /* file system pack name */
39 __be32 fs_bmsize; /* size of bitmap in bytes */
40 __be32 fs_tfree; /* total free data blocks */
41 __be32 fs_tinode; /* total free inodes */
42 __be32 fs_bmblock; /* bitmap location. */
43 __be32 fs_replsb; /* Location of replicated superblock. */
44 __be32 fs_lastialloc; /* last allocated inode */
45 char fs_spare[20]; /* space for expansion - MUST BE ZERO */
46 __be32 fs_checksum; /* checksum of volume portion of fs */
47 };
48
49 /* efs superblock information in memory */
50 struct efs_sb_info {
51 __u32 fs_magic; /* superblock magic number */
52 __u32 fs_start; /* first block of filesystem */
53 __u32 first_block; /* first data block in filesystem */
54 __u32 total_blocks; /* total number of blocks in filesystem */
55 __u32 group_size; /* # of blocks a group consists of */
56 __u32 data_free; /* # of free data blocks */
57 __u32 inode_free; /* # of free inodes */
58 __u16 inode_blocks; /* # of blocks used for inodes in every grp */
59 __u16 total_groups; /* # of groups */
60 };
61
62 #endif /* __EFS_FS_SB_H__ */
63
64
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