#ifndef _ADFS_FS_H
  #define _ADFS_FS_H
  
  #include <uapi/linux/adfs_fs.h>
  
  /*
   * Calculate the boot block checksum on an ADFS drive.  Note that this will
   * appear to be correct if the sector contains all zeros, so also check that
   * the disk size is non-zero!!!
   */
  static inline int adfs_checkbblk(unsigned char *ptr)
  {
  	unsigned int result = 0;
  	unsigned char *p = ptr + 511;
  
  	do {
  	        result = (result & 0xff) + (result >> 8);
          	result = result + *--p;
  	} while (p != ptr);
  
  	return (result & 0xff) != ptr[511];
  }
  #endif