linux-kernel - Re: [PATCH] scsi: Silence unnecessary warnings about ioctl to partition

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Message-ID: <20120615143106.GA16540@elliptictech.com>
Date:	Fri, 15 Jun 2012 10:31:06 -0400
From:	Nick Bowler <nbowler@...iptictech.com>
To:	Jan Kara <jack@...e.cz>
Cc:	Jens Axboe <axboe@...nel.dk>, LKML <linux-kernel@...r.kernel.org>,
	linux-scsi@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
	James Bottomley <JBottomley@...allels.com>
Subject: Re: [PATCH] scsi: Silence unnecessary warnings about ioctl to
 partition

On 2012-06-15 16:23 +0200, Jan Kara wrote:
> On Fri 15-06-12 09:58:25, Nick Bowler wrote:
> > On 2012-06-15 12:51 +0200, Jens Axboe wrote:
> > > On 06/15/2012 12:50 PM, Jan Kara wrote:
> > > > Sometimes, warnings about ioctls to partition happen often enough that they
> > > > form majority of the warnings in the kernel log and users complain. In some
> > > > cases warnings are about ioctls such as SG_IO so it's not good to get rid of
> > > > the warnings completely as they can ease debugging of userspace problems
> > > > when ioctl is refused.
> > > > 
> > > > Since I have seen warnings from lots of commands, including some proprietary
> > > > userspace applications, I don't think disallowing the ioctls for processes
> > > > with CAP_SYS_RAWIO will happen in the near future if ever. So lets just
> > > > stop warning for processes with CAP_SYS_RAWIO for which ioctl is allowed.
> > > 
> > > Agree, merged, finally.
> > 
> > Hurray!
> > 
> > This should be -stable material as well, as >=3.2.y kernel versions are
> > affected (I think 3.0.y is OK?).
>   3.0 also spits those warnings. But I'm not convinced this is really a
> -stable material. I don't see anybody loosing sleep over this...

These messages are quite annoying on my raid boxes (currently running
3.2.y) where mdadm spews a whole pile of these whenever you do anything.

Even with the rate limiting, they make up a substantial proportion of
the total log messages.

Cheers,
-- 
Nick Bowler, Elliptic Technologies (http://www.elliptictech.com/)

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