linux-kernel - Re: [BUG] remount ro on loopback mount leaves unmountable filesystem behind

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Message-ID: <4829CB8B.1000500@zytor.com>
Date:	Tue, 13 May 2008 10:10:35 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Christoph Hellwig <hch@...radead.org>
CC:	David Chinner <dgc@....com>, lkml <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	util-linux-ng@...r.kernel.org
Subject: Re: [BUG] remount ro on loopback mount leaves unmountable	filesystem
 behind

Christoph Hellwig wrote:
> On Tue, May 13, 2008 at 10:07:10PM +1000, David Chinner wrote:
>> Anyway, I'll hard code loop device numbers into the script so
>> I can just forget about this problem. Thanks, Christoph.
> 
> hardcoding them is a little dangerous because a system might aswell
> have them in use already, e.g. for CD images.  Just use losetup -f to
> find the first free one and keep it in a shell variable.

losetup -f is racy, too.  losetup -sf is safe, however.

	-hpa
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