This is a note to let you know that I've just added the patch titled
scsi_scan: Restrict sequential scan to 256 LUNs
to the 3.16-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
scsi_scan-restrict-sequential-scan-to-256-luns.patch
and it can be found in the queue-3.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 22ffeb48b7584d6cd50f2a595ed6065d86a87459 Mon Sep 17 00:00:00 2001
From: Hannes Reinecke <hare@xxxxxxx>
Date: Tue, 3 Jun 2014 10:58:53 +0200
Subject: scsi_scan: Restrict sequential scan to 256 LUNs
From: Hannes Reinecke <hare@xxxxxxx>
commit 22ffeb48b7584d6cd50f2a595ed6065d86a87459 upstream.
Sequential scan for more than 256 LUNs is very fragile as
LUNs might not be numbered sequentially after that point.
SAM revisions later than SCSI-3 impose a structure on
LUNs larger than 256, making LUN numbers between 256
and 16384 illegal.
SCSI-3, however allows for plain 64-bit numbers with
no internal structure.
So restrict sequential LUN scan to 256 LUNs and add a
new blacklist flag 'BLIST_SCSI3LUN' to scan up to
max_lun devices.
Signed-off-by: Hannes Reinecke <hare@xxxxxxx>
Reviewed-by: Ewan Milne <emilne@xxxxxxxxxx>
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/scsi/scsi_scan.c | 6 ++++++
include/scsi/scsi_devinfo.h | 2 ++
2 files changed, 8 insertions(+)
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -1239,6 +1239,12 @@ static void scsi_sequential_lun_scan(str
max_dev_lun = min(8U, max_dev_lun);
/*
+ * Stop scanning at 255 unless BLIST_SCSI3LUN
+ */
+ if (!(bflags & BLIST_SCSI3LUN))
+ max_dev_lun = min(256U, max_dev_lun);
+
+ /*
* We have already scanned LUN 0, so start at LUN 1. Keep scanning
* until we reach the max, or no LUN is found and we are not
* sparse_lun.
--- a/include/scsi/scsi_devinfo.h
+++ b/include/scsi/scsi_devinfo.h
@@ -32,4 +32,6 @@
#define BLIST_ATTACH_PQ3 0x1000000 /* Scan: Attach to PQ3 devices */
#define BLIST_NO_DIF 0x2000000 /* Disable T10 PI (DIF) */
#define BLIST_SKIP_VPD_PAGES 0x4000000 /* Ignore SBC-3 VPD pages */
+#define BLIST_SCSI3LUN 0x8000000 /* Scan more than 256 LUNs
+ for sequential scan */
#endif
Patches currently in stable-queue which might be from hare@xxxxxxx are
queue-3.16/drivers-scsi-storvsc-implement-a-eh_timed_out-handler.patch
queue-3.16/drivers-scsi-storvsc-correctly-handle-test_unit_ready-failure.patch
queue-3.16/drivers-scsi-storvsc-set-srb_flags-in-all-cases.patch
queue-3.16/drivers-scsi-storvsc-fix-a-bug-in-handling-vmbus-protocol-version.patch
queue-3.16/scsi-save-command-pool-address-of-scsi_host.patch
queue-3.16/drivers-scsi-storvsc-change-the-limits-to-reflect-the-values-on-the-host.patch
queue-3.16/drivers-scsi-storvsc-filter-commands-based-on-the-storage-protocol-version.patch
queue-3.16/drivers-scsi-storvsc-set-cmd_per_lun-to-reflect-value-supported-by-the-host.patch
queue-3.16/scsi_scan-restrict-sequential-scan-to-256-luns.patch
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