linux-kernel - Re: ext3fs: umount+sync not enough to guarantee metadata-on-disk

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Message-Id: <1181661358.18067.28.camel@sisko.scot.redhat.com>
Date:	Tue, 12 Jun 2007 16:15:58 +0100
From:	"Stephen C. Tweedie" <sct@...hat.com>
To:	Pavel Machek <pavel@....cz>
Cc:	Mark Lord <lkml@....ca>, Andrew Morton <akpm@...ux-foundation.org>,
	"Theodore Ts'o" <tytso@....edu>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Stephen Tweedie <sct@...hat.com>
Subject: Re: ext3fs: umount+sync not enough to guarantee metadata-on-disk

Hi,

On Sun, 2007-06-10 at 18:27 +0000, Pavel Machek wrote:

> > Once a f/s is read-only, there should be NO writing to 
> > it.  Right?
> 
> Linux happily writes to filesystems mounted read-only. It will replay
> journal on them.

Only at mount time, not on unmount; and it does check whether the
underlying device is truly readonly or not first (assuming
bdev_read_only() is working on the device in question.)

--Stephen


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