[linux-2.6-block.git] / include / linux / adfs_fs.h

#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
Commit	Line	Data
1da177e4 LT	1	#ifndef _ADFS_FS_H
	2	#define _ADFS_FS_H
	3
607ca46e	4	#include <uapi/linux/adfs_fs.h>
1da177e4	5
1da177e4 LT	6	/*
	7	* Calculate the boot block checksum on an ADFS drive. Note that this will
	8	* appear to be correct if the sector contains all zeros, so also check that
	9	* the disk size is non-zero!!!
	10	*/
	11	static inline int adfs_checkbblk(unsigned char *ptr)
	12	{
	13	unsigned int result = 0;
	14	unsigned char *p = ptr + 511;
	15
	16	do {
	17	result = (result & 0xff) + (result >> 8);
	18	result = result + *--p;
	19	} while (p != ptr);
	20
	21	return (result & 0xff) != ptr[511];
	22	}
1da177e4	23	#endif