linux-kernel - mtime updates for mmapped files.

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Message-ID: <20080116094640.GA2071@bitwizard.nl>
Date:	Wed, 16 Jan 2008 10:46:40 +0100
From:	Rogier Wolff <R.E.Wolff@...Wizard.nl>
To:	linux-kernel@...r.kernel.org
Subject: mtime updates for mmapped files. 

Hi,

I  wrote a small app yesterday that updates a file by mmapping the 
file (RW), changing the thing around, and then exiting. 

This did not trigger a change in the mtime of the file. Thus rsync
didn't pick up that the file had changed.

I understand that tracking every change to a RW mmapped file is
costly, and thus unfeasable, but shouldn't then the close cause a
mtime update?

The server where this happened is running 2.6.21, so my apologies if
this has already been corrected.

	Roger. 

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