Subject: Re: [PATCH] fix remap of shared read only mappings
From: James Bottomley <James.Bottomley@steeleye.com>
To: Daniel Phillips <phillips@arcor.de>
Cc: Jamie Lokier <jamie@shareable.org>, Linus Torvalds <torvalds@osdl.org>,
       Linux Kernel <linux-kernel@vger.kernel.org>
In-Reply-To: <200309050249.21152.phillips@arcor.de>
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	<20030904214810.GG31590@mail.jlokier.co.uk>
	<1062714829.2161.384.camel@mulgrave>  <200309050249.21152.phillips@arcor.de>
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Date: 04 Sep 2003 20:52:36 -0400
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On Thu, 2003-09-04 at 20:49, Daniel Phillips wrote:
> This an interesting tidbit, as I'm busy working on a DFS mmap for OpenGFS, and 
> I want to be sure I'm implementing true-blue Posix semantics.  But trawling 
> through the Posix/SUS specification at:
> 
>    http://www.unix-systems.org/version3/online.html
> 
> all it says is that for MAP_SHARED "write references shall change the 
> underlying object."  I don't see anything about when those changes become 
> visible to other mappers, much less any discussion of local caching.  Am I 
> looking at the wrong document?

Not sure which is "correct", but the one I'm looking at is the POSIX
update from the open group:

http://www.opengroup.org/onlinepubs/007904975/functions/mmap.html

And that's where I was quoting from.

James


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