Re: [PATCH] fix remap of shared read only mappings

[Linus Torvalds]

On Fri, 5 Sep 2003, 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.

Please don't.

POSIX semantics are weak enough not to be interesting. Exactly because a 
number of old hardware platforms simply _cannot_ give you good coherency. 
And a number of old UNIXes couldn't either, for that matter.

What really matters is that mmap() under Linux is 100% coherent, as far as 
the hardware just allows. We haven't taken the easy way out. We shouldn't 
start now.

		Linus

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