linux-kernel - Re: [PATCH 2/2][RFC][BUG] msync: updating ctime and mtime at syncing

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Date:	Fri, 11 Jan 2008 13:59:21 -0500
From:	Peter Staubach <staubach@...hat.com>
To:	Anton Salikhmetov <salikhmetov@...il.com>
CC:	linux-mm@...ck.org, jakob@...hought.net,
	linux-kernel@...r.kernel.org, Valdis.Kletnieks@...edu,
	riel@...hat.com, ksm@...dk, jesper.juhl@...il.com
Subject: Re: [PATCH 2/2][RFC][BUG] msync: updating ctime and mtime at syncing

Anton Salikhmetov wrote:
> From: Anton Salikhmetov <salikhmetov@...il.com>
>
> The patch contains changes for updating the ctime and mtime fields for memory mapped files:
>
> 1) adding a new flag triggering update of the inode data;
> 2) implementing a helper function for checking that flag and updating ctime and mtime;
> 3) updating time stamps for mapped files in sys_msync() and do_fsync().

Sorry, one other issue to throw out too -- an mmap'd block device
should also have its inode time fields updated.  This is a little
tricky because the inode referenced via mapping->host isn't the
one that needs to have the time fields updated on.

I have attached the patch that I submitted last.  It is quite out
of date, but does show my attempt to resolve some of these issues.

    Thanx...

       ps

View attachment "mmap_mctime.devel.v2" of type "text/plain" (6019 bytes)