linux-kernel - Re: [dm-devel] linux-next - WARNING: at fs/block_dev.c:824 bd_link_disk

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Message-ID: <20110113204145.GC31800@thunk.org>
Date:	Thu, 13 Jan 2011 15:41:45 -0500
From:	Ted Ts'o <tytso@....edu>
To:	NeilBrown <neilb@...e.de>
Cc:	Tejun Heo <tj@...nel.org>, Milan Broz <mbroz@...hat.com>,
	Karel Zak <kzak@...hat.com>,
	device-mapper development <dm-devel@...hat.com>,
	Jun'ichi Nomura <j-nomura@...jp.nec.com>,
	Valdis.Kletnieks@...edu, linux-kernel@...r.kernel.org,
	linux-raid@...r.kernel.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel@...r.kernel.org, Kay Sievers <kay.sievers@...y.org>
Subject: Re: [dm-devel] linux-next - WARNING: at fs/block_dev.c:824
 bd_link_disk_holder+0x92/0x1ac()

On Fri, Jan 14, 2011 at 07:18:58AM +1100, NeilBrown wrote:
> 
> open(O_EXCL) will fail on a block device if it is being used by anything else
> - a filesystem or a dm target or an md array or ....
> 
> So if the *only* thing you want is "is this currently an active part of
> something else", then O_EXCL works since 2.6.0 (I think).

Unfortunately, that won't distinguish between a currently active file
system, and a device which is being used by a dm target, which is what
we want to do.

						- Ted
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