linux-kernel - compat_ioctl: ignore RAID

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Date:	Sat, 30 Jan 2010 23:02:10 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	"Michael S. Tsirkin" <m.s.tsirkin@...il.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	neilb@...e.de, linux-raid@...r.kernel.org, dm-devel@...hat.com,
	maan@...temlinux.org
Subject: compat_ioctl: ignore RAID_VERSION ioctl

md ioctls are now handled by the md driver itself, but mdadm
may call RAID_VERSION on other devices as well. Mark the command
as IGNORE_IOCTL so this fails silently rather than printing
an annoying message.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---

On Saturday 30 January 2010, Michael S. Tsirkin wrote:
> Under 2.6.33-rcX (at least rc5 and rc6, didn't check earlier versions),
> I started seeing these messages in dmesg (I do not see these messages on 2.6.32):
> 
> [   16.528951] ioctl32(mdadm:2243): Unknown cmd fd(3) cmd(800c0910){t:09;sz:12} arg(ffb7f9c4) on /dev/sda9

Does this help?

--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -1038,6 +1038,8 @@ COMPATIBLE_IOCTL(FIOQSIZE)
 #ifdef CONFIG_BLOCK
 /* loop */
 IGNORE_IOCTL(LOOP_CLR_FD)
+/* md calls this on random blockdevs */
+IGNORE_IOCTL(RAID_VERSION)
 /* SG stuff */
 COMPATIBLE_IOCTL(SG_SET_TIMEOUT)
 COMPATIBLE_IOCTL(SG_GET_TIMEOUT)

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