linux-kernel - Re: [PATCH 3/4] Do not allow umounting of frozen filesystems

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Message-ID: <4AB8F3EC.6050607@redhat.com>
Date:	Tue, 22 Sep 2009 10:57:32 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Al Viro <viro@...IV.linux.org.uk>
CC:	Fernando Luis V?zquez Cao <fernando@....ntt.co.jp>,
	Christoph Hellwig <hch@....de>, t-sato@...jp.nec.com,
	m-hamaguchi@...jp.nec.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/4] Do not allow umounting of frozen filesystems

Al Viro wrote:
...

> IOW, I'd rather add two new ioctls (check if frozen/thaw), both by
> bdev.  On top of the first two patches in this set.

> Comments?

The check ioctls would be very very useful, IMHO.  Many filesystem tools
refuse to operate on a mounted filesystem, but in some cases it'd be
safe to do readonly operations on a frozen, mounted fs.

-Eric
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