linux-kernel - Re: read-only partitions: does the policy apply to all metadata ?

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Message-ID: <20090315211043.GA1395@ucw.cz>
Date:	Sun, 15 Mar 2009 22:17:37 +0100
From:	Pavel Machek <pavel@....cz>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Valdis.Kletnieks@...edu, porte64@...e.fr,
	linux-kernel@...r.kernel.org
Subject: Re: read-only partitions: does the policy apply to all metadata ?

On Tue 2009-03-10 17:34:37, Alan Cox wrote:
> On Tue, 10 Mar 2009 13:22:39 -0400
> Valdis.Kletnieks@...edu wrote:
> 
> > On Tue, 10 Mar 2009 17:26:44 BST, porte64@...e.fr said:
> > > When a partition is mounted as read-only, does the kernel
> > > really prevent ANY byte to be written to it, including
> > > any metadata ?
> > 
> > It's very hard to come up with a workable way to do a true read-only
> > mount of a journaled filesystem such as ext3 - what do you do if there's
> > anything in the journal that needs to be replayed?
> 
> Replay it to a snapshot backed by the r/o fs ...

Or you can use 'ro, noload' to just ignore the journal. See the docs.

-- 
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