From Peter Chubb

printk changes: A sector_t can be either 64 or 32 bits, so cast it to a
printable type that is at least as large as 64-bits on all platforms
(i.e., cast to unsigned long long and use a %llu format)

Transition to 64-bit sector_t: fix isofs_get_blocks by converting the
(possibly 64-bit) arg to a long.

SCSI 64-bit sector_t cleanup: capacity now stored as sector_t; make
sure that the READ_CAPACITY command doesn't sign-extend its returned
value; avoid 64-bit division when printing size in MB.

Still to do:
 - 16-byte SCSI commands
 - Individual scsi drivers.