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

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Message-Id: <E1HW72O-0003ZB-00@dorka.pomaz.szeredi.hu>
Date:	Tue, 27 Mar 2007 10:28:16 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	akpm@...ux-foundation.org
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

> > 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()?

It's rather more expensive, than just toggling a bit.

Let me work on it a bit more.  I think I can make the current patch
more palatable.

Miklos
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