[SCSI] BLIST_ATTACH_PQ3 flags

Some devices report a peripheral qualifier of 3 for LUN 0; with the original
code, we would still try a REPORT_LUNS scan (if SCSI level is >= 3 or if we
have the BLIST_REPORTLUNS2 passed in), but NOT any sequential scan.
Also, the device at LUN 0 (which is not connected according to the PQ) is not
registered with the OS.

Unfortunately, SANs exist that are SCSI-2 and do NOT support REPORT_LUNS, but
report a unknown device with PQ 3 on LUN 0. We still need to scan them, and
most probably we even need BLIST_SPARSELUN (and BLIST_LARGELUN). See the bug
reference for an infamous example.

This is patch 3/3:
3. Implement the blacklist flag BLIST_ATTACH_PQ3 that makes the scsi
   scanning code register PQ3 devices and continues scanning; only sg
   will attach thanks to scsi_bus_match().

Signed-off-by: Kurt Garloff <garloff@suse.de>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/scsi_scan.c

@@ -900,7 +900,7 @@ static int scsi_probe_and_add_lun(struct scsi_target *starget,
 	/*
 	 * result contains valid SCSI INQUIRY data.
 	 */
-	if ((result[0] >> 5) == 3) {
+	if (((result[0] >> 5) == 3) && !(bflags & BLIST_ATTACH_PQ3)) {
 		/*
 		 * For a Peripheral qualifier 3 (011b), the SCSI
 		 * spec says: The device server is not capable of