linux-kernel - [PATCH] Disable partition scan

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Message-ID: <48B52D0B.2090104@suse.de>
Date:	Wed, 27 Aug 2008 12:31:39 +0200
From:	Hannes Reinecke <hare@...e.de>
To:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH] Disable partition scan

Hi all,

for some setups (eg dmraid or multipathing) the in-kernel partition scan
is pointless; the (block) partitions won't be used anywhere. Instead the
system will be using kpartx-generated device-mapper devices.
Worse, on some setups (RAID0 dmraid or active/passive multipath devices)
the in-kernel partition scan will generate plenty of I/O errors as the
partitions table might not be accessible or invalid for this device.

This patch implements a new kernel command-line option 'no_partition_scan'
which will switch off the partition scan globally. The partition scan can
be re-enabled for individual devices by echoing any positive number smaller
than the number of minors into
/sys/class/block/XXX/range

and rescanning the device.

Please apply.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare@...e.de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Markus Rex, HRB 16746 (AG Nürnberg)

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