On 10/22/2009 09:08 PM, Thomas Schlichter wrote:
>>
>> I have couple of issues with this patchset still. pci_mmap_page_range()
>> doesn't get called for each fork(). So, we won't be ref counting the
>> mtrr usage properly.
>
> When forking, what happens with the "struct file"? If it is being copied,
> then the
> processes share the same private data which would be freed during the first
> release(). I think this would be a problem whereever file-private data are
> used.
>
> So I think it must be shared between the forked processes and some reference
> counting must exist. This reference counting must ensure that release() is
> only
> called when all processes did close() their file.
>
> And in that case (shared "struct file", one single release() call in the end)
> this
> implementation should be completely safe...
>
struct file is shared between forked processes.
-hpa
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