4 #include <uapi/linux/adfs_fs.h>
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!!!
11 static inline int adfs_checkbblk(unsigned char *ptr)
13 unsigned int result = 0;
14 unsigned char *p = ptr + 511;
17 result = (result & 0xff) + (result >> 8);
18 result = result + *--p;
21 return (result & 0xff) != ptr[511];