linux-kernel - Re: [patch resend v4] update ctime and mtime for mmaped write

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Message-Id: <20070327001834.04dc375e.akpm@linux-foundation.org>
Date:	Tue, 27 Mar 2007 00:18:34 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	a.p.zijlstra@...llo.nl, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [patch resend v4] update ctime and mtime for mmaped write

On Tue, 27 Mar 2007 10:03:41 +0200 Miklos Szeredi <miklos@...redi.hu> wrote:

> But Peter Staubach says a RH custumer has files written thorugh mmap,
> which are not being backed up.

Yes, I expect the backup problem is the major real-world hurt arising from
this bug.

But I expect we could adequately plug that problem at munmap()-time.  Or,
better, do_wp_page().  As I said - half-assed.

It's a question if whether the backup problem is the only thing which is hurting
in the real-world, or if people have other problems.

(In fact, what's wrong with doing it in do_wp_page()?  The timestamp could
be up to 30 seconds too early, but that's heaps better than what we have
now..)

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