Re: [pnfs] [PATCH 3/3] pnfs-blocklayout client: add block device pipe processing based on simple rpc pipefs

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On Fri, Jun 04, 2010 at 02:25:06PM -0400, Christoph Hellwig wrote:
> Btw, simple reminder that all this has zero chance of going upstream
> until someone addresses the issue of a proper API for locking down the
> device mappings and getting the final block mapping in kernelspace.

Do you have any more details on the issue?  (Reference to a previous
thread?)

My (probably faulty) understanding of the the basic idea of the patches:
a list of block signatures and a description of the desired topology is
passed up to a userspace daemon, and the daemon cobbles together a
device and passes down device major/minor numbers for the result.

Are major/minor numbers the right way to hand off the device?  (And what
do you mean by "locking down the device mappings"?  Is there a
possibility the device can be destroyed while the kernel's using it?)

--b.
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