82 lines
2.4 KiB
C
82 lines
2.4 KiB
C
#ifndef _OMFS_FS_H
|
|
#define _OMFS_FS_H
|
|
|
|
/* OMFS On-disk structures */
|
|
|
|
#define OMFS_MAGIC 0xC2993D87
|
|
#define OMFS_IMAGIC 0xD2
|
|
|
|
#define OMFS_DIR 'D'
|
|
#define OMFS_FILE 'F'
|
|
#define OMFS_INODE_NORMAL 'e'
|
|
#define OMFS_INODE_CONTINUATION 'c'
|
|
#define OMFS_INODE_SYSTEM 's'
|
|
#define OMFS_NAMELEN 256
|
|
#define OMFS_DIR_START 0x1b8
|
|
#define OMFS_EXTENT_START 0x1d0
|
|
#define OMFS_EXTENT_CONT 0x40
|
|
#define OMFS_XOR_COUNT 19
|
|
#define OMFS_MAX_BLOCK_SIZE 8192
|
|
#define OMFS_MAX_CLUSTER_SIZE 8
|
|
|
|
struct omfs_super_block {
|
|
char s_fill1[256];
|
|
__be64 s_root_block; /* block number of omfs_root_block */
|
|
__be64 s_num_blocks; /* total number of FS blocks */
|
|
__be32 s_magic; /* OMFS_MAGIC */
|
|
__be32 s_blocksize; /* size of a block */
|
|
__be32 s_mirrors; /* # of mirrors of system blocks */
|
|
__be32 s_sys_blocksize; /* size of non-data blocks */
|
|
};
|
|
|
|
struct omfs_header {
|
|
__be64 h_self; /* FS block where this is located */
|
|
__be32 h_body_size; /* size of useful data after header */
|
|
__be16 h_crc; /* crc-ccitt of body_size bytes */
|
|
char h_fill1[2];
|
|
u8 h_version; /* version, always 1 */
|
|
char h_type; /* OMFS_INODE_X */
|
|
u8 h_magic; /* OMFS_IMAGIC */
|
|
u8 h_check_xor; /* XOR of header bytes before this */
|
|
__be32 h_fill2;
|
|
};
|
|
|
|
struct omfs_root_block {
|
|
struct omfs_header r_head; /* header */
|
|
__be64 r_fill1;
|
|
__be64 r_num_blocks; /* total number of FS blocks */
|
|
__be64 r_root_dir; /* block # of root directory */
|
|
__be64 r_bitmap; /* block # of free space bitmap */
|
|
__be32 r_blocksize; /* size of a block */
|
|
__be32 r_clustersize; /* size allocated for data blocks */
|
|
__be64 r_mirrors; /* # of mirrors of system blocks */
|
|
char r_name[OMFS_NAMELEN]; /* partition label */
|
|
};
|
|
|
|
struct omfs_inode {
|
|
struct omfs_header i_head; /* header */
|
|
__be64 i_parent; /* parent containing this inode */
|
|
__be64 i_sibling; /* next inode in hash bucket */
|
|
__be64 i_ctime; /* ctime, in milliseconds */
|
|
char i_fill1[35];
|
|
char i_type; /* OMFS_[DIR,FILE] */
|
|
__be32 i_fill2;
|
|
char i_fill3[64];
|
|
char i_name[OMFS_NAMELEN]; /* filename */
|
|
__be64 i_size; /* size of file, in bytes */
|
|
};
|
|
|
|
struct omfs_extent_entry {
|
|
__be64 e_cluster; /* start location of a set of blocks */
|
|
__be64 e_blocks; /* number of blocks after e_cluster */
|
|
};
|
|
|
|
struct omfs_extent {
|
|
__be64 e_next; /* next extent table location */
|
|
__be32 e_extent_count; /* total # extents in this table */
|
|
__be32 e_fill;
|
|
struct omfs_extent_entry e_entry; /* start of extent entries */
|
|
};
|
|
|
|
#endif
|