linux-kernel - Re: Problem with multiple mounts

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Date:	Thu, 09 Nov 2006 10:37:18 -0600
From:	David Masover <ninja@...phack.com>
To:	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>
CC:	Suzuki <suzuki@...ux.vnet.ibm.com>, reiserfs-list@...esys.com,
	lkml <linux-kernel@...r.kernel.org>, Jan Kara <jack@...e.cz>
Subject: Re: Problem with multiple mounts

Lennart Sorensen wrote:
> On Wed, Nov 08, 2006 at 04:06:23PM -0700, Andreas Dilger wrote:
>> I would suggest that even while this is not supported, it would be prudent
>> to fix such a bug.  It might be possible to hit a similar problem if there
>> is corruption of the on-disk data in the journal and oopsing the kernel
>> isn't a graceful way to deal with bad data on disk.
> 
> On the other hand corrupt data at least doesn't change under you while
> you are trying to figure out the filesystem.

It might.

I'd suspect that there can, in fact, be something done about this, 
assuming good RAM. After all, a corrupt image won't crash a decent web 
browser.

It might sacrifice a ton of performance, though. I suggest it shouldn't 
be a priority to try to figure this out, and if it's ever implemented, 
make it a mount option -- -o paranoid or something. Obviously we don't 
care if a rescue disc takes forever, but we don't want to be waiting for 
hours on our FS boot, which is why I have an initrd mount my Reiser4 FS 
with "-o dont_load_bitmap"

(Yes, I realize the right way to do this is initramfs now. I'm too lazy 
to figure out how to make that work.)
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