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.
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