linux-kernel - Re: [PATCH][RFC][BUG] updating the ctime and mtime time stamps in msync()

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Message-ID: <20080109210108.GB27738@hjernemadsen.org>
Date:	Wed, 9 Jan 2008 22:01:09 +0100
From:	"Klaus S. Madsen" <ksm@...dk>
To:	Rik van Riel <riel@...hat.com>
Cc:	Anton Salikhmetov <salikhmetov@...il.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH][RFC][BUG] updating the ctime and mtime time stamps in msync()

On Wed, Jan 09, 2008 at 15:50:15 -0500, Rik van Riel wrote:
> > Specifically, the ctime and mtime time stamps do change
> > when modifying the mapped memory and do not change when
> > there have been no write references between the mmap()
> > and msync() system calls.
> 
> As long as the ctime and mtime stamps change when the memory is
> written to, what exactly is the problem?

A "not" is missing from the sentence above. The quote above should have
read:

> > Specifically, the ctime and mtime time stamps do _not_ change when
> > modifying the mapped memory and do not change when there have been
> > no write references between the mmap() and msync() system calls.

So essentially the problem is that mtime stamps are _never_ changed when
the file is only modified through mmap. Not even when calling msync().

-- 
Kind regards,
	Klaus S. Madsen
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