Re: [RFC ABI V1 4/8] RDMA/core: Add support for custom types

[Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>]

On Wed, Jul 13, 2016 at 07:57:04PM +0300, Matan Barak wrote:

> Maybe instead of having an idr per device, it's better to have an idr per
> uverbs file.

Oh, I thought you were doing that already!

Yes, the idr must be per ucontext, otherwise we create a big security
problem. Access to one files object #'s cannot be allowed from another
file.

> However, when a device is removed, we need to find all its related objects
> and destroy them. In order to do that in a simple way, we could say that a
> uverbs_file is either not bound to any rdma device or bound to a
> single IB

This is just more searching on the disassociate path. Search all
ucontexts for any uobj connected to the victim device.

If we drop the file == device scheme then we need a generic op to
tell what device a uobj is associated with. All our kobjs already
store this information, so it isn't a big deal.

Jason
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