[PATCH 2/6] shm: add sealing API

[Andy Lutomirski]

On Fri, Apr 11, 2014 at 2:42 PM, David Herrmann <dh.herrmann at gmail.com> wrote:
> Hi
>
> On Fri, Apr 11, 2014 at 11:36 PM, Andy Lutomirski <luto at amacapital.net> wrote:
>> A quick grep of the kernel tree finds exactly zero code paths
>> incrementing i_mmap_writable outside of mmap and fork.
>>
>> Or do you mean a different kind of write ref?  What am I missing here?
>
> Sorry, I meant i_writecount.

I bet this is missing from lots of places.  For example, I can't find
any write_access stuff in the rdma code.

I suspect that the VM_DENYWRITE code is just generally racy.

--Andy