tree 7d399d5847dd3be95368cf66860439ae0954ae19
parent 1c8e71d72026ed4c6ba0fdfd7eebd865f4fd1415
author Douglas Gilbert <dougg@torque.net> 1126260452 +1000
committer James Bottomley <jejb@mulgrave.(none)> 1126302164 -0500

[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 <dougg@torque.net>
Acked-by: Jens Axboe <axboe@suse.de>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>