[SCSI] sd: Support disks formatted with DIF Type 2

Disks formatted with DIF Type 2 reject READ/WRITE 6/10/12/16 commands
when protection is enabled.  Only the 32-byte variants are supported.

Implement support for issusing 32-byte READ/WRITE and enable Type 2
drives in the protection type detection logic.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/scsi/sd.h b/drivers/scsi/sd.h
index ce1f5f899fe3..e374804d26fb 100644
--- a/drivers/scsi/sd.h
+++ b/drivers/scsi/sd.h
@@ -37,6 +37,11 @@
  */
 #define SD_LAST_BUGGY_SECTORS   8
 
+enum {
+        SD_EXT_CDB_SIZE = 32,   /* Extended CDB size */
+        SD_MEMPOOL_SIZE = 2,    /* CDB pool size */
+};
+
 struct scsi_disk {
         struct scsi_driver *driver;     /* always &sd_template */
         struct scsi_device *device;