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

[Miklos Szeredi]

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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