Re: [PATCH 1/3] Continue after PQ3 on LUN0
Kurt Garloff <garloff <at> suse.de>
2006-05-01 00:48:00 GMT
From: Kurt Garloff <garloff <at> suse.de>
Subject: Tolerate PQ 3 at LUN 0 for scanning
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 next
patch for an example.
This is patch 1/3:
If we end up in sequential scan, at least try LUN 1 for devices
that reported a PQ of 3 for LUN 0.
Also return blacklist flags, even for PQ3 devices.
Signed-off-by: Kurt Garloff <garloff <at> suse.de>
diff -uNrp linux-2.6-hg/drivers/scsi.0/scsi_scan.c linux-2.6-hg/drivers/scsi/scsi_scan.c
--- linux-2.6-hg/drivers/scsi.0/scsi_scan.c 2006-04-19 08:55:03.000000000 +0200
+++ linux-2.6-hg/drivers/scsi/scsi_scan.c 2006-04-24 07:37:39.000000000 +0200
<at> <at> -880,6 +880,8 <at> <at> static int scsi_probe_and_add_lun(struct
if (scsi_probe_lun(sdev, result, result_len, &bflags))
+ if (bflagsp)
+ *bflagsp = bflags;