linux-kernel - Re: [PATCH] quota: Turn quotas off when remounting read-only

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Date:	Fri, 15 Feb 2008 15:10:29 +0100 (CET)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Jan Kara <jack@...e.cz>
cc:	Michael Tokarev <mjt@....msk.ru>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, stable@...nel.org
Subject: Re: [PATCH] quota: Turn quotas off when remounting read-only


On Feb 11 2008 13:39, Jan Kara wrote:
>> 
>> But...  I'm thinking about this scenario:
>> 
>>  # mount /data
>>  # quotaon /data
>>  (some maintenance stuff to be planned)
>>  # mount -o remount,ro /data
>>  (do backup etc)
>>  # mount -r remount,rw /data
>> 
>> at this point, it's expected that quota on /data is enabled.
>> After this patch, it's not anymore...
>
>  Yes, it previously accidentally worked this way (for an year or so,
>before that we refused to remount read-only). Hmm, but maybe we could
>somehow tweak quotas to be turned on when remounting read-write again.
>We have all the information we need at the time of remounting read-only
>so we could store it and use it later when remounting read-write. I'll have
>a look into that.

Maybe it is possible to leave quota on all times, so that the
reporting quota ioctls continue to work even in ro mode?

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