1 #ifndef _OMFS_FS_H 2 #define _OMFS_FS_H 3 4 /* OMFS On-disk structures */ 5 6 #define OMFS_MAGIC 0xC2993D87 7 #define OMFS_IMAGIC 0xD2 8 9 #define OMFS_DIR 'D' 10 #define OMFS_FILE 'F' 11 #define OMFS_INODE_NORMAL 'e' 12 #define OMFS_INODE_CONTINUATION 'c' 13 #define OMFS_INODE_SYSTEM 's' 14 #define OMFS_NAMELEN 256 15 #define OMFS_DIR_START 0x1b8 16 #define OMFS_EXTENT_START 0x1d0 17 #define OMFS_EXTENT_CONT 0x40 18 #define OMFS_XOR_COUNT 19 19 #define OMFS_MAX_BLOCK_SIZE 8192 20 21 struct omfs_super_block { 22 char s_fill1[256]; 23 __be64 s_root_block; /* block number of omfs_root_block */ 24 __be64 s_num_blocks; /* total number of FS blocks */ 25 __be32 s_magic; /* OMFS_MAGIC */ 26 __be32 s_blocksize; /* size of a block */ 27 __be32 s_mirrors; /* # of mirrors of system blocks */ 28 __be32 s_sys_blocksize; /* size of non-data blocks */ 29 }; 30 31 struct omfs_header { 32 __be64 h_self; /* FS block where this is located */ 33 __be32 h_body_size; /* size of useful data after header */ 34 __be16 h_crc; /* crc-ccitt of body_size bytes */ 35 char h_fill1[2]; 36 u8 h_version; /* version, always 1 */ 37 char h_type; /* OMFS_INODE_X */ 38 u8 h_magic; /* OMFS_IMAGIC */ 39 u8 h_check_xor; /* XOR of header bytes before this */ 40 __be32 h_fill2; 41 }; 42 43 struct omfs_root_block { 44 struct omfs_header r_head; /* header */ 45 __be64 r_fill1; 46 __be64 r_num_blocks; /* total number of FS blocks */ 47 __be64 r_root_dir; /* block # of root directory */ 48 __be64 r_bitmap; /* block # of free space bitmap */ 49 __be32 r_blocksize; /* size of a block */ 50 __be32 r_clustersize; /* size allocated for data blocks */ 51 __be64 r_mirrors; /* # of mirrors of system blocks */ 52 char r_name[OMFS_NAMELEN]; /* partition label */ 53 }; 54 55 struct omfs_inode { 56 struct omfs_header i_head; /* header */ 57 __be64 i_parent; /* parent containing this inode */ 58 __be64 i_sibling; /* next inode in hash bucket */ 59 __be64 i_ctime; /* ctime, in milliseconds */ 60 char i_fill1[35]; 61 char i_type; /* OMFS_[DIR,FILE] */ 62 __be32 i_fill2; 63 char i_fill3[64]; 64 char i_name[OMFS_NAMELEN]; /* filename */ 65 __be64 i_size; /* size of file, in bytes */ 66 }; 67 68 struct omfs_extent_entry { 69 __be64 e_cluster; /* start location of a set of blocks */ 70 __be64 e_blocks; /* number of blocks after e_cluster */ 71 }; 72 73 struct omfs_extent { 74 __be64 e_next; /* next extent table location */ 75 __be32 e_extent_count; /* total # extents in this table */ 76 __be32 e_fill; 77 struct omfs_extent_entry e_entry; /* start of extent entries */ 78 }; 79 80 #endif 81