linux-kernel - Re: [fuse-devel] [PATCH] FUSE/CUSE: implement direct mmap support

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Message-Id: <E1NfYFm-00034C-Pd@pomaz-ex.szeredi.hu>
Date:	Thu, 11 Feb 2010 13:34:42 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	Tejun Heo <tj@...nel.org>
CC:	miklos@...redi.hu, mszeredi@...e.cz, linux-kernel@...r.kernel.org,
	fuse-devel@...ts.sourceforge.net, polynomial-c@...too.org,
	akpm@...ux-foundation.org
Subject: Re: [fuse-devel] [PATCH] FUSE/CUSE: implement direct mmap support

On Thu, 11 Feb 2010, Tejun Heo wrote:
> It's not like it's something completely foreign.  It's a limitation
> which can also be found in shared memory and the server side mmap
> doesn't really have much to do with it.  It's also necessary to avoid
> aliasing issues among clients.

What aliasing issues among clients?  That's a job for the arch
dependent part of mmap.  And as you said, there's not a lot the driver
can do (except play with ->vm_pgoff) to influence the address
selection.

And playing with ->vm_pgoff is *not* a valid thing to do for the
client, at least not on "normal" mmaps.

Thanks,
Miklos
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