libosd: osd_sense: OSD_CFO_PERMISSIONS

Add one more important cdb_field_offset that can be returned with
scsi_invalid_field_in_cdb. It is the offset of the permissions_bit_mask
field in the capabilities structure.

Interestingly, the offset is the same for V1/V2
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>

include/scsi/osd_sense.h

@@ -255,6 +255,9 @@ enum osdv2_cdb_field_offset {
 	OSD_CFO_STARTING_BYTE	= OSD_CDB_OFFSET(v2.start_address),
 	OSD_CFO_PARTITION_ID	= OSD_CDB_OFFSET(partition),
 	OSD_CFO_OBJECT_ID	= OSD_CDB_OFFSET(object),
+	OSD_CFO_PERMISSIONS	= sizeof(struct osd_cdb_head) +
+					offsetof(struct osd_capability_head,
+						 permissions_bit_mask),
 };
 
 #endif /* ndef __OSD_SENSE_H__ */