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 #define OMFS_MAX_CLUSTER_SIZE 8 21 22 struct omfs_super_block { 23 char s_fill1[256]; 24 __be64 s_root_block; /* block number of omfs_root_block */ 25 __be64 s_num_blocks; /* total number of FS blocks */ 26 __be32 s_magic; /* OMFS_MAGIC */ 27 __be32 s_blocksize; /* size of a block */ 28 __be32 s_mirrors; /* # of mirrors of system blocks */ 29 __be32 s_sys_blocksize; /* size of non-data blocks */ 30 }; 31 32 struct omfs_header { 33 __be64 h_self; /* FS block where this is located */ 34 __be32 h_body_size; /* size of useful data after header */ 35 __be16 h_crc; /* crc-ccitt of body_size bytes */ 36 char h_fill1[2]; 37 u8 h_version; /* version, always 1 */ 38 char h_type; /* OMFS_INODE_X */ 39 u8 h_magic; /* OMFS_IMAGIC */ 40 u8 h_check_xor; /* XOR of header bytes before this */ 41 __be32 h_fill2; 42 }; 43 44 struct omfs_root_block { 45 struct omfs_header r_head; /* header */ 46 __be64 r_fill1; 47 __be64 r_num_blocks; /* total number of FS blocks */ 48 __be64 r_root_dir; /* block # of root directory */ 49 __be64 r_bitmap; /* block # of free space bitmap */ 50 __be32 r_blocksize; /* size of a block */ 51 __be32 r_clustersize; /* size allocated for data blocks */ 52 __be64 r_mirrors; /* # of mirrors of system blocks */ 53 char r_name[OMFS_NAMELEN]; /* partition label */ 54 }; 55 56 struct omfs_inode { 57 struct omfs_header i_head; /* header */ 58 __be64 i_parent; /* parent containing this inode */ 59 __be64 i_sibling; /* next inode in hash bucket */ 60 __be64 i_ctime; /* ctime, in milliseconds */ 61 char i_fill1[35]; 62 char i_type; /* OMFS_[DIR,FILE] */ 63 __be32 i_fill2; 64 char i_fill3[64]; 65 char i_name[OMFS_NAMELEN]; /* filename */ 66 __be64 i_size; /* size of file, in bytes */ 67 }; 68 69 struct omfs_extent_entry { 70 __be64 e_cluster; /* start location of a set of blocks */ 71 __be64 e_blocks; /* number of blocks after e_cluster */ 72 }; 73 74 struct omfs_extent { 75 __be64 e_next; /* next extent table location */ 76 __be32 e_extent_count; /* total # extents in this table */ 77 __be32 e_fill; 78 struct omfs_extent_entry e_entry; /* start of extent entries */ 79 }; 80 81 #endif 82