Re: [PATCH] cowlinks v2

[Jamie Lokier]

Erik Andersen wrote:
> > Here's a tricky situation:
> > 
> >    1. A file is cowlinked.  Then each cowlink is mmap()'d, one per process.
> > 
> >    2. At this point both mappings share the same pages in RAM.
> > 
> >    3. Then one of the cowlinks is written to...
> 
> Using mmap with PROT_WRITE on a cowlink must preemptively
> break the link.

I forget to mention, they are PROT_READ shared mappings.

-- Jamie
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