Logically: masked_status == ((status & 0x3e) >> 1) .
So 'masked_status' strips the vendor information bits off 'status'
and then shifts it right one position. This makes it easier to do
things like "if (CHECK_CONDITION == masked_status) ..." using the
definitions in <scsi/scsi.h>. The defined values in this file are:
N.B. 1 bit offset from usual SCSI status values
Note that SCSI 3 defines some additional status codes.
[1]
The type of masked_status is unsigned char .