#ifndef _FALLOC_H_
  #define _FALLOC_H_
  
  #define FALLOC_FL_KEEP_SIZE	0x01 /* default is extend size */

  #define FALLOC_FL_PUNCH_HOLE	0x02 /* de-allocates range */

  #ifdef __KERNEL__
  
  /*
   * Space reservation ioctls and argument structure
   * are designed to be compatible with the legacy XFS ioctls.
   */
  struct space_resv {
  	__s16		l_type;
  	__s16		l_whence;
  	__s64		l_start;
  	__s64		l_len;		/* len == 0 means until end of file */
  	__s32		l_sysid;
  	__u32		l_pid;
  	__s32		l_pad[4];	/* reserved area */
  };
  
  #define FS_IOC_RESVSP		_IOW('X', 40, struct space_resv)
  #define FS_IOC_RESVSP64		_IOW('X', 42, struct space_resv)
  
  #endif /* __KERNEL__ */

  #endif /* _FALLOC_H_ */