linux-kernel - Re: mtime updates for mmapped files.

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Date:	Wed, 16 Jan 2008 18:03:17 +0800
From:	"Dave Young" <hidave.darkstar@...il.com>
To:	"Rogier Wolff" <R.E.Wolff@...wizard.nl>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: mtime updates for mmapped files.

On Jan 16, 2008 5:46 PM, Rogier Wolff <R.E.Wolff@...wizard.nl> wrote:
>
> 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.

This is an old bug, don't know if it was fixed or not. Please see
http://lkml.org/lkml/2006/5/17/138

>
>         Roger.
>
> --
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