linux-kernel - Re: bd_mount_mutex -> bd_mount_sem (was Re: xfs_file_ioctl / xfs_freeze: BUG: warning at kernel/mutex-debug.c:80/debug_mutex

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Message-ID: <45A30828.6000508@sandeen.net>
Date:	Mon, 08 Jan 2007 21:12:40 -0600
From:	Eric Sandeen <sandeen@...deen.net>
To:	Andrew Morton <akpm@...l.org>
CC:	David Chinner <dgc@....com>,
	linux-kernel Mailing List <linux-kernel@...r.kernel.org>,
	xfs@....sgi.com
Subject: Re: bd_mount_mutex -> bd_mount_sem (was Re: xfs_file_ioctl / xfs_freeze:
 BUG: warning at kernel/mutex-debug.c:80/debug_mutex_unlock())

Andrew Morton wrote:
> On Tue, 9 Jan 2007 10:47:28 +1100
> David Chinner <dgc@....com> wrote:
> 
>> On Mon, Jan 08, 2007 at 10:40:54AM -0600, Eric Sandeen wrote:
>>> Sami Farin wrote:
>>>> On Mon, Jan 08, 2007 at 08:37:34 +1100, David Chinner wrote:
>>>> ...
>>>>>> fstab was there just fine after -u.
>>>>> Oh, that still hasn't been fixed?
>>>> Looked like it =)
>>> Hm, it was proposed upstream a while ago:
>>>
>>> http://lkml.org/lkml/2006/9/27/137
>>>
>>> I guess it got lost?
>> Seems like it. Andrew, did this ever get queued for merge?
> 
> Seems not.  I think people were hoping that various nasties in there
> would go away.  We return to userspace with a kernel lock held??

Is a semaphore any worse than the current mutex in this respect?  At 
least unlocking from another thread doesn't violate semaphore rules.  :)

-Eric
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