text: #ifndef _UDF_I_H
  #define _UDF_I_H
  
  /*
   * The i_data_sem and i_mutex serve for protection of allocation information
   * of a regular files and symlinks. This includes all extents belonging to
   * the file/symlink, a fact whether data are in-inode or in external data
   * blocks, preallocation, goal block information... When extents are read,
   * i_mutex or i_data_sem must be held (for reading is enough in case of
   * i_data_sem). When extents are changed, i_data_sem must be held for writing
   * and also i_mutex must be held.
   *
   * For directories i_mutex is used for all the necessary protection.
   */
  
  struct udf_inode_info {
  	struct timespec		i_crtime;
  	/* Physical address of inode */
  	struct kernel_lb_addr		i_location;
  	__u64			i_unique;
  	__u32			i_lenEAttr;
  	__u32			i_lenAlloc;
  	__u64			i_lenExtents;
  	__u32			i_next_alloc_block;
  	__u32			i_next_alloc_goal;
  	unsigned		i_alloc_type : 3;
  	unsigned		i_efe : 1;	/* extendedFileEntry */
  	unsigned		i_use : 1;	/* unallocSpaceEntry */
  	unsigned		i_strat4096 : 1;
  	unsigned		reserved : 26;
  	union {
  		struct short_ad	*i_sad;
  		struct long_ad		*i_lad;
  		__u8		*i_data;
  	} i_ext;
  	struct rw_semaphore	i_data_sem;
  	struct inode vfs_inode;
  };
  
  static inline struct udf_inode_info *UDF_I(struct inode *inode)
  {
  	return list_entry(inode, struct udf_inode_info, vfs_inode);
  }
  
  #endif /* _UDF_I_H) */
  