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 | |