[SCSI] permit READ DEFECT DATA in block/scsi_ioctl

The soon to be released smartmontools 5.34 uses the
READ DEFECT DATA command on SCSI disks. A disk that
has defect list entries (or worse, an increasing number
of them) is at risk.

Currently the first invocation of smartctl causes this:
scsi: unknown opcode 0x37
message to appear the console and in the log.

The READ DEFECT DATA SCSI command does not change
the state of a disk. Its opcode (0x37) is valid for
SBC devices (e.g. disks) and SMC-2 devices (media
changers) where it is called INITIALIZE STATUS ELEMENT
WITH RANGE and again doesn't change the external state
of the device.

Changelog:
- mark SCSI opcode 0x37 (READ DEFECT DATA) as
safe_for_read

Signed-off-by: Douglas Gilbert <[e-mail]>
Acked-by: Jens Axboe <[e-mail]>
Signed-off-by: James Bottomley <[e-mail]>

drivers/block/scsi_ioctl.c

···
 		safe_for_read(READ_12),
 		safe_for_read(READ_16),
 		safe_for_read(READ_BUFFER),
+		safe_for_read(READ_DEFECT_DATA),
 		safe_for_read(READ_LONG),
 		safe_for_read(INQUIRY),
 		safe_for_read(MODE_SENSE),