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Message-ID: <20090518114305.GA6303@infradead.org> Date: Mon, 18 May 2009 07:43:05 -0400 From: Christoph Hellwig <hch@...radead.org> To: Ferenc Wagner <wferi@...f.hu> Cc: Ray Lee <ray-lk@...rabbit.org>, Andrew Morton <akpm@...ux-foundation.org>, Peter Staubach <staubach@...hat.com>, Miklos Szeredi <mszeredi@...e.cz>, xfs@....sgi.com, linux-kernel@...r.kernel.org Subject: Re: mmap vs mtime in 2.6.26 and up On Fri, May 15, 2009 at 12:50:54PM -0400, Christoph Hellwig wrote: > On Fri, May 15, 2009 at 06:40:29PM +0200, Ferenc Wagner wrote: > > Thanks for the analysis. Unfortunately I don't nearly know enough to > > work on this issue, but would like to track it as it affects our > > backup system. So, shouldn't #2645 be reopened again? > > Yes, definitively as the current "fix" is incorrected. I'll try to cook > up a correct version once I get some time. Doing this correctly in the framework of the current codee is unfortunately not so easy, as calling ->setattr requires taking i_mutex which we can't in the pagefaul path. To fix this properly we need to actually update the timestamps during msync and co as done by the patches from Miklos: http://lkml.org/lkml/2007/2/28/166 and Peter: http://lkml.org/lkml/2006/5/31/176 ----- End forwarded message ----- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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