1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun #ifndef _OMFS_FS_H 3*4882a593Smuzhiyun #define _OMFS_FS_H 4*4882a593Smuzhiyun 5*4882a593Smuzhiyun /* OMFS On-disk structures */ 6*4882a593Smuzhiyun 7*4882a593Smuzhiyun #define OMFS_MAGIC 0xC2993D87 8*4882a593Smuzhiyun #define OMFS_IMAGIC 0xD2 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun #define OMFS_DIR 'D' 11*4882a593Smuzhiyun #define OMFS_FILE 'F' 12*4882a593Smuzhiyun #define OMFS_INODE_NORMAL 'e' 13*4882a593Smuzhiyun #define OMFS_INODE_CONTINUATION 'c' 14*4882a593Smuzhiyun #define OMFS_INODE_SYSTEM 's' 15*4882a593Smuzhiyun #define OMFS_NAMELEN 256 16*4882a593Smuzhiyun #define OMFS_DIR_START 0x1b8 17*4882a593Smuzhiyun #define OMFS_EXTENT_START 0x1d0 18*4882a593Smuzhiyun #define OMFS_EXTENT_CONT 0x40 19*4882a593Smuzhiyun #define OMFS_XOR_COUNT 19 20*4882a593Smuzhiyun #define OMFS_MAX_BLOCK_SIZE 8192 21*4882a593Smuzhiyun #define OMFS_MAX_CLUSTER_SIZE 8 22*4882a593Smuzhiyun #define OMFS_MAX_BLOCKS (1ul << 31) 23*4882a593Smuzhiyun 24*4882a593Smuzhiyun struct omfs_super_block { 25*4882a593Smuzhiyun char s_fill1[256]; 26*4882a593Smuzhiyun __be64 s_root_block; /* block number of omfs_root_block */ 27*4882a593Smuzhiyun __be64 s_num_blocks; /* total number of FS blocks */ 28*4882a593Smuzhiyun __be32 s_magic; /* OMFS_MAGIC */ 29*4882a593Smuzhiyun __be32 s_blocksize; /* size of a block */ 30*4882a593Smuzhiyun __be32 s_mirrors; /* # of mirrors of system blocks */ 31*4882a593Smuzhiyun __be32 s_sys_blocksize; /* size of non-data blocks */ 32*4882a593Smuzhiyun }; 33*4882a593Smuzhiyun 34*4882a593Smuzhiyun struct omfs_header { 35*4882a593Smuzhiyun __be64 h_self; /* FS block where this is located */ 36*4882a593Smuzhiyun __be32 h_body_size; /* size of useful data after header */ 37*4882a593Smuzhiyun __be16 h_crc; /* crc-ccitt of body_size bytes */ 38*4882a593Smuzhiyun char h_fill1[2]; 39*4882a593Smuzhiyun u8 h_version; /* version, always 1 */ 40*4882a593Smuzhiyun char h_type; /* OMFS_INODE_X */ 41*4882a593Smuzhiyun u8 h_magic; /* OMFS_IMAGIC */ 42*4882a593Smuzhiyun u8 h_check_xor; /* XOR of header bytes before this */ 43*4882a593Smuzhiyun __be32 h_fill2; 44*4882a593Smuzhiyun }; 45*4882a593Smuzhiyun 46*4882a593Smuzhiyun struct omfs_root_block { 47*4882a593Smuzhiyun struct omfs_header r_head; /* header */ 48*4882a593Smuzhiyun __be64 r_fill1; 49*4882a593Smuzhiyun __be64 r_num_blocks; /* total number of FS blocks */ 50*4882a593Smuzhiyun __be64 r_root_dir; /* block # of root directory */ 51*4882a593Smuzhiyun __be64 r_bitmap; /* block # of free space bitmap */ 52*4882a593Smuzhiyun __be32 r_blocksize; /* size of a block */ 53*4882a593Smuzhiyun __be32 r_clustersize; /* size allocated for data blocks */ 54*4882a593Smuzhiyun __be64 r_mirrors; /* # of mirrors of system blocks */ 55*4882a593Smuzhiyun char r_name[OMFS_NAMELEN]; /* partition label */ 56*4882a593Smuzhiyun }; 57*4882a593Smuzhiyun 58*4882a593Smuzhiyun struct omfs_inode { 59*4882a593Smuzhiyun struct omfs_header i_head; /* header */ 60*4882a593Smuzhiyun __be64 i_parent; /* parent containing this inode */ 61*4882a593Smuzhiyun __be64 i_sibling; /* next inode in hash bucket */ 62*4882a593Smuzhiyun __be64 i_ctime; /* ctime, in milliseconds */ 63*4882a593Smuzhiyun char i_fill1[35]; 64*4882a593Smuzhiyun char i_type; /* OMFS_[DIR,FILE] */ 65*4882a593Smuzhiyun __be32 i_fill2; 66*4882a593Smuzhiyun char i_fill3[64]; 67*4882a593Smuzhiyun char i_name[OMFS_NAMELEN]; /* filename */ 68*4882a593Smuzhiyun __be64 i_size; /* size of file, in bytes */ 69*4882a593Smuzhiyun }; 70*4882a593Smuzhiyun 71*4882a593Smuzhiyun struct omfs_extent_entry { 72*4882a593Smuzhiyun __be64 e_cluster; /* start location of a set of blocks */ 73*4882a593Smuzhiyun __be64 e_blocks; /* number of blocks after e_cluster */ 74*4882a593Smuzhiyun }; 75*4882a593Smuzhiyun 76*4882a593Smuzhiyun struct omfs_extent { 77*4882a593Smuzhiyun __be64 e_next; /* next extent table location */ 78*4882a593Smuzhiyun __be32 e_extent_count; /* total # extents in this table */ 79*4882a593Smuzhiyun __be32 e_fill; 80*4882a593Smuzhiyun struct omfs_extent_entry e_entry; /* start of extent entries */ 81*4882a593Smuzhiyun }; 82*4882a593Smuzhiyun 83*4882a593Smuzhiyun #endif 84