| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 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 omfs_header { |
| 35 | __be64 h_self; /* FS block where this is located */ |
| 36 | __be32 h_body_size; /* size of useful data after header */ |
| 37 | __be16 h_crc; /* crc-ccitt of body_size bytes */ |
| 38 | char h_fill1[2]; |
| 39 | u8 h_version; /* version, always 1 */ |
| 40 | char h_type; /* OMFS_INODE_X */ |
| 41 | u8 h_magic; /* OMFS_IMAGIC */ |
| 42 | u8 h_check_xor; /* XOR of header bytes before this */ |
| 43 | __be32 h_fill2; |
| 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 |