#include <linux/fs.h>
  #include <linux/buffer_head.h>
  #include <linux/exportfs.h>
  #include <linux/iso_fs.h>
  #include <asm/unaligned.h>
  
  enum isofs_file_format {
  	isofs_file_normal = 0,
  	isofs_file_sparse = 1,
  	isofs_file_compressed = 2,
  };
  	
  /*
   * iso fs inode data in memory
   */
  struct iso_inode_info {
  	unsigned long i_iget5_block;
  	unsigned long i_iget5_offset;
  	unsigned int i_first_extent;
  	unsigned char i_file_format;
  	unsigned char i_format_parm[3];
  	unsigned long i_next_section_block;
  	unsigned long i_next_section_offset;
  	off_t i_section_size;
  	struct inode vfs_inode;
  };
  
  /*
   * iso9660 super-block data in memory
   */
  struct isofs_sb_info {
  	unsigned long s_ninodes;
  	unsigned long s_nzones;
  	unsigned long s_firstdatazone;
  	unsigned long s_log_zone_size;
  	unsigned long s_max_size;
  	
  	int           s_rock_offset; /* offset of SUSP fields within SU area */
  	unsigned char s_joliet_level;
  	unsigned char s_mapping;
  	unsigned int  s_high_sierra:1;
  	unsigned int  s_rock:2;
  	unsigned int  s_utf8:1;
  	unsigned int  s_cruft:1; /* Broken disks with high byte of length
  				  * containing junk */
  	unsigned int  s_nocompress:1;
  	unsigned int  s_hide:1;
  	unsigned int  s_showassoc:1;
  	unsigned int  s_overriderockperm:1;
  	unsigned int  s_uid_set:1;
  	unsigned int  s_gid_set:1;
  
  	umode_t s_fmode;
  	umode_t s_dmode;
  	kgid_t s_gid;
  	kuid_t s_uid;
  	struct nls_table *s_nls_iocharset; /* Native language support table */
  };
  
  #define ISOFS_INVALID_MODE ((umode_t) -1)
  
  static inline struct isofs_sb_info *ISOFS_SB(struct super_block *sb)
  {
  	return sb->s_fs_info;
  }
  
  static inline struct iso_inode_info *ISOFS_I(struct inode *inode)
  {
  	return container_of(inode, struct iso_inode_info, vfs_inode);
  }
  
  static inline int isonum_711(char *p)
  {
  	return *(u8 *)p;
  }
  static inline int isonum_712(char *p)
  {
  	return *(s8 *)p;
  }
  static inline unsigned int isonum_721(char *p)
  {
  	return get_unaligned_le16(p);
  }
  static inline unsigned int isonum_722(char *p)
  {
  	return get_unaligned_be16(p);
  }
  static inline unsigned int isonum_723(char *p)
  {
  	/* Ignore bigendian datum due to broken mastering programs */
  	return get_unaligned_le16(p);
  }
  static inline unsigned int isonum_731(char *p)
  {
  	return get_unaligned_le32(p);
  }
  static inline unsigned int isonum_732(char *p)
  {
  	return get_unaligned_be32(p);
  }
  static inline unsigned int isonum_733(char *p)
  {
  	/* Ignore bigendian datum due to broken mastering programs */
  	return get_unaligned_le32(p);
  }
  extern int iso_date(char *, int);
  
  struct inode;		/* To make gcc happy */
  
  extern int parse_rock_ridge_inode(struct iso_directory_record *, struct inode *, int relocated);
  extern int get_rock_ridge_filename(struct iso_directory_record *, char *, struct inode *);
  extern int isofs_name_translate(struct iso_directory_record *, char *, struct inode *);
  
  int get_joliet_filename(struct iso_directory_record *, unsigned char *, struct inode *);
  int get_acorn_filename(struct iso_directory_record *, char *, struct inode *);
  
  extern struct dentry *isofs_lookup(struct inode *, struct dentry *, unsigned int flags);
  extern struct buffer_head *isofs_bread(struct inode *, sector_t);
  extern int isofs_get_blocks(struct inode *, sector_t, struct buffer_head **, unsigned long);
  
  struct inode *__isofs_iget(struct super_block *sb,
  			   unsigned long block,
  			   unsigned long offset,
  			   int relocated);
  
  static inline struct inode *isofs_iget(struct super_block *sb,
  				       unsigned long block,
  				       unsigned long offset)
  {
  	return __isofs_iget(sb, block, offset, 0);
  }
  
  static inline struct inode *isofs_iget_reloc(struct super_block *sb,
  					     unsigned long block,
  					     unsigned long offset)
  {
  	return __isofs_iget(sb, block, offset, 1);
  }
  
  /* Because the inode number is no longer relevant to finding the
   * underlying meta-data for an inode, we are free to choose a more
   * convenient 32-bit number as the inode number.  The inode numbering
   * scheme was recommended by Sergey Vlasov and Eric Lammerts. */
  static inline unsigned long isofs_get_ino(unsigned long block,
  					  unsigned long offset,
  					  unsigned long bufbits)
  {
  	return (block << (bufbits - 5)) | (offset >> 5);
  }
  
  /* Every directory can have many redundant directory entries scattered
   * throughout the directory tree.  First there is the directory entry
   * with the name of the directory stored in the parent directory.
   * Then, there is the "." directory entry stored in the directory
   * itself.  Finally, there are possibly many ".." directory entries
   * stored in all the subdirectories.
   *
   * In order for the NFS get_parent() method to work and for the
   * general consistency of the dcache, we need to make sure the
   * "i_iget5_block" and "i_iget5_offset" all point to exactly one of
   * the many redundant entries for each directory.  We normalize the
   * block and offset by always making them point to the "."  directory.
   *
   * Notice that we do not use the entry for the directory with the name
   * that is located in the parent directory.  Even though choosing this
   * first directory is more natural, it is much easier to find the "."
   * entry in the NFS get_parent() method because it is implicitly
   * encoded in the "extent + ext_attr_length" fields of _all_ the
   * redundant entries for the directory.  Thus, it can always be
   * reached regardless of which directory entry you have in hand.
   *
   * This works because the "." entry is simply the first directory
   * record when you start reading the file that holds all the directory
   * records, and this file starts at "extent + ext_attr_length" blocks.
   * Because the "." entry is always the first entry listed in the
   * directories file, the normalized "offset" value is always 0.
   *
   * You should pass the directory entry in "de".  On return, "block"
   * and "offset" will hold normalized values.  Only directories are
   * affected making it safe to call even for non-directory file
   * types. */
  static inline void
  isofs_normalize_block_and_offset(struct iso_directory_record* de,
  				 unsigned long *block,
  				 unsigned long *offset)
  {
  	/* Only directories are normalized. */
  	if (de->flags[0] & 2) {
  		*offset = 0;
  		*block = (unsigned long)isonum_733(de->extent)
  			+ (unsigned long)isonum_711(de->ext_attr_length);
  	}
  }
  
  extern const struct inode_operations isofs_dir_inode_operations;
  extern const struct file_operations isofs_dir_operations;
  extern const struct address_space_operations isofs_symlink_aops;
  extern const struct export_operations isofs_export_ops;