From: Kurt Garloff <garloff@xxxxxxx>
Subject: Log a message if we stop scanning because dev reports PQ==3
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.
SCSI_CHECK_LOGGING macro and warning fixes from Andrew Morton.
This patch 3/3:
If a PQ3 device is found, log a message that describes the device
(INQUIRY DATA and C:B:T:U tuple) and make a suggestion for blacklisting
it.
Signed-off-by: Kurt Garloff <garloff@xxxxxxx>
diff -uNrp linux-2.6-hg/drivers/scsi.2/scsi_logging.h linux-2.6-hg/drivers/scsi/scsi_logging.h
--- linux-2.6-hg/drivers/scsi.2/scsi_logging.h 2005-07-19 03:34:43.000000000 +0200
+++ linux-2.6-hg/drivers/scsi/scsi_logging.h 2006-04-27 23:03:29.000000000 +0200
@@ -45,10 +45,12 @@ extern unsigned int scsi_logging_level;
((scsi_logging_level >> (SHIFT)) & ((1 << (BITS)) - 1))
#define SCSI_CHECK_LOGGING(SHIFT, BITS, LEVEL, CMD) \
-{ \
+do { \
if (unlikely((SCSI_LOG_LEVEL(SHIFT, BITS)) > (LEVEL))) \
- (CMD); \
-}
+ do { \
+ CMD; \
+ } while (0); \
+} while (0)
#else
#define SCSI_CHECK_LOGGING(SHIFT, BITS, LEVEL, CMD)
#endif /* CONFIG_SCSI_LOGGING */
diff -uNrp linux-2.6-hg/drivers/scsi.2/scsi_scan.c linux-2.6-hg/drivers/scsi/scsi_scan.c
--- linux-2.6-hg/drivers/scsi.2/scsi_scan.c 2006-04-24 07:40:03.000000000 +0200
+++ linux-2.6-hg/drivers/scsi/scsi_scan.c 2006-04-27 23:05:14.000000000 +0200
@@ -816,6 +816,32 @@ static inline void scsi_destroy_sdev(str
put_device(&sdev->sdev_gendev);
}
+#ifdef CONFIG_SCSI_LOGGING
+/**
+ * scsi_inq_str - print INQUIRY data from min to max index,
+ * strip trailing whitespace
+ * @buf: Output buffer with at least end-first+1 bytes of space
+ * @inq: Inquiry buffer (input)
+ * @first: Offset of string into inq
+ * @end: Index after last character in inq
+ */
+static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq,
+ unsigned first, unsigned end)
+{
+ unsigned term = 0, idx;
+
+ for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) {
+ if (inq[idx+first] > ' ') {
+ buf[idx] = inq[idx+first];
+ term = idx+1;
+ } else {
+ buf[idx] = ' ';
+ }
+ }
+ buf[term] = 0;
+ return buf;
+}
+#endif
/**
* scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
@@ -896,9 +922,22 @@ static int scsi_probe_and_add_lun(struct
* logical disk configured at sdev->lun, but there
* is a target id responding.
*/
- SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
- "scsi scan: peripheral qualifier of 3,"
- " no device added\n"));
+ SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:"
+ " peripheral qualifier of 3, device not"
+ " added\n"))
+ if (lun == 0) {
+ SCSI_LOG_SCAN_BUS(1, {
+ unsigned char vend[9];
+ unsigned char mod[17];
+
+ sdev_printk(KERN_INFO, sdev,
+ "scsi scan: consider passing scsi_mod."
+ "dev_flags=%s:%s:0x240 or 0x1000240\n",
+ scsi_inq_str(vend, result, 8, 16),
+ scsi_inq_str(mod, result, 16, 32));
+ });
+ }
+
res = SCSI_SCAN_TARGET_PRESENT;
goto out_free_result;
}
--
Kurt Garloff, Head Architect Linux R&D, Novell Inc.
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