On 10/09/18 10:41 AM, Christoph Hellwig wrote:
On Wed, Sep 05, 2018 at 03:03:18PM -0600, Logan Gunthorpe wrote:
> There is no special p2p submission process. In the nvme-of case we are
> using the existing process and with the code in blk-core it didn't
> change it's process at all. Creating a helper will create one and I can
> look at making a pci_p2pdma_submit_bio() for v6; but if the developer
> screws up and still calls the regular submit_bio() things will only be
> very subtly broken and that won't be obvious.
I just saw you added that "helper" in your tree. Please don't, it is
a negative value add as it doesn't help anything with the checking.
Alright, so what's the consensus then? Just have a check in
nvmet_bdev_execute_rw() to add REQ_NOMERGE when appropriate? Jens is
pretty dead set against adding to the common path.
P.S. Here's the commit in question for anyone else on the list: