#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