1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef _OMFS_FS_H |
3 | #define _OMFS_FS_H |
4 | |
5 | /* OMFS On-disk structures */ |
6 | |
7 | #define OMFS_MAGIC 0xC2993D87 |
8 | #define OMFS_IMAGIC 0xD2 |
9 | |
10 | #define OMFS_DIR 'D' |
11 | #define OMFS_FILE 'F' |
12 | #define OMFS_INODE_NORMAL 'e' |
13 | #define OMFS_INODE_CONTINUATION 'c' |
14 | #define OMFS_INODE_SYSTEM 's' |
15 | #define OMFS_NAMELEN 256 |
16 | #define OMFS_DIR_START 0x1b8 |
17 | #define OMFS_EXTENT_START 0x1d0 |
18 | #define OMFS_EXTENT_CONT 0x40 |
19 | #define OMFS_XOR_COUNT 19 |
20 | #define OMFS_MAX_BLOCK_SIZE 8192 |
21 | #define OMFS_MAX_CLUSTER_SIZE 8 |
22 | #define OMFS_MAX_BLOCKS (1ul << 31) |
23 | |
24 | struct omfs_super_block { |
25 | char s_fill1[256]; |
26 | __be64 s_root_block; /* block number of omfs_root_block */ |
27 | __be64 s_num_blocks; /* total number of FS blocks */ |
28 | __be32 s_magic; /* OMFS_MAGIC */ |
29 | __be32 s_blocksize; /* size of a block */ |
30 | __be32 s_mirrors; /* # of mirrors of system blocks */ |
31 | __be32 s_sys_blocksize; /* size of non-data blocks */ |
32 | }; |
33 | |
34 | struct { |
35 | __be64 ; /* FS block where this is located */ |
36 | __be32 h_body_size; /* size of useful data after header */ |
37 | __be16 ; /* crc-ccitt of body_size bytes */ |
38 | char [2]; |
39 | u8 ; /* version, always 1 */ |
40 | char ; /* OMFS_INODE_X */ |
41 | u8 ; /* OMFS_IMAGIC */ |
42 | u8 ; /* XOR of header bytes before this */ |
43 | __be32 ; |
44 | }; |
45 | |
46 | struct omfs_root_block { |
47 | struct omfs_header r_head; /* header */ |
48 | __be64 r_fill1; |
49 | __be64 r_num_blocks; /* total number of FS blocks */ |
50 | __be64 r_root_dir; /* block # of root directory */ |
51 | __be64 r_bitmap; /* block # of free space bitmap */ |
52 | __be32 r_blocksize; /* size of a block */ |
53 | __be32 r_clustersize; /* size allocated for data blocks */ |
54 | __be64 r_mirrors; /* # of mirrors of system blocks */ |
55 | char r_name[OMFS_NAMELEN]; /* partition label */ |
56 | }; |
57 | |
58 | struct omfs_inode { |
59 | struct omfs_header i_head; /* header */ |
60 | __be64 i_parent; /* parent containing this inode */ |
61 | __be64 i_sibling; /* next inode in hash bucket */ |
62 | __be64 i_ctime; /* ctime, in milliseconds */ |
63 | char i_fill1[35]; |
64 | char i_type; /* OMFS_[DIR,FILE] */ |
65 | __be32 i_fill2; |
66 | char i_fill3[64]; |
67 | char i_name[OMFS_NAMELEN]; /* filename */ |
68 | __be64 i_size; /* size of file, in bytes */ |
69 | }; |
70 | |
71 | struct omfs_extent_entry { |
72 | __be64 e_cluster; /* start location of a set of blocks */ |
73 | __be64 e_blocks; /* number of blocks after e_cluster */ |
74 | }; |
75 | |
76 | struct omfs_extent { |
77 | __be64 e_next; /* next extent table location */ |
78 | __be32 e_extent_count; /* total # extents in this table */ |
79 | __be32 e_fill; |
80 | struct omfs_extent_entry e_entry[]; /* start of extent entries */ |
81 | }; |
82 | |
83 | #endif |
84 | |