[PATCH v4 0/8] Support for Open-Channel SSDs

[Matias Bjorling]

> I don't think the current abuses of the block API are acceptable though.
> The crazy deep merging shouldn't be too relevant for SSD-type devices
> so I think you'd do better than trying to reuse the TYPE_FS level
> blk-mq merging code.  If you want to reuse the request
> allocation/submission code that's still doable.
>
> As a start add a new submit_io method to the nvm_dev_ops, and add
> an implementation similar to pscsi_execute_cmd in
> drivers/target/target_core_pscsi.c for nvme, and a trivial no op
> for a null-nvm driver replacing the null-blk additions.  This
> will give you very similar behavior to your current code, while
> allowing to drop all the hacks in the block code.  Note that simple
> plugging will work just fine which should be all you'll need.
>

Thanks, I appreciate you taking the time to go through it. I'll respin 
the patches and remove the block hacks.