Message-ID: <4AB8FF4D.6070607@oss.ntt.co.jp>
Date: Wed, 23 Sep 2009 01:46:05 +0900
From: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>
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To: Eric Sandeen <sandeen@redhat.com>
CC: Al Viro <viro@ZenIV.linux.org.uk>, Christoph Hellwig <hch@lst.de>,
       t-sato@yk.jp.nec.com, m-hamaguchi@ys.jp.nec.com,
       Andrew Morton <akpm@linux-foundation.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 3/4] Do not allow umounting of frozen filesystems
References: <4A94C151.8020900@oss.ntt.co.jp> <20090826173839.GA20175@lst.de> <4A965BD1.205@oss.ntt.co.jp> <4A9692CF.80508@oss.ntt.co.jp> <20090922110737.GL5858@ZenIV.linux.org.uk> <4AB8F3EC.6050607@redhat.com>
In-Reply-To: <4AB8F3EC.6050607@redhat.com>
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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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