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

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Message-ID: <4AB8FF4D.6070607@oss.ntt.co.jp>
Date:	Wed, 23 Sep 2009 01:46:05 +0900
From:	Fernando Luis Vazquez Cao <fernando@....ntt.co.jp>
To:	Eric Sandeen <sandeen@...hat.com>
CC:	Al Viro <viro@...IV.linux.org.uk>, 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

Eric Sandeen さんは書きました:
> 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.
>   

Yep, and HA software would benefit from the check ioctls too.

- Fernando
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