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

[Miklos Szeredi]

On Wed, 10 Feb 2010, Tejun Heo wrote:
> > When does that happen?  Can it happen that two mappings of the same
> > file descriptor will have different backing pages?
> 
> Yeah, sure.  FUSE server is free to give them separate regions.  The
> only restriction is the SHMLBA alignment which is pretty easy to
> adhere to.

What I really meant was: does it ever happen that mapping a *single
open file* of a chardev twice will result in two different maps?
Or will the maps be only different if it was a different open of the
device?

If there's a pattern there, we might make the sharing/non-sharing
automated, and greatly simplify the interface.

Thanks,
Miklos
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