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Internal logic for both core and media managers, does not have a backing bio for issuing I/Os. Introduce nvm_submit_ppa to allow raw I/Os to be submitted to the underlying device driver. The function request the device, ppa, data buffer and its length and will submit the I/O synchronously to the device. The return value may therefore be used to detect any errors regarding the issued I/O. Signed-off-by: Matias Bjørling <m@bjorling.me> Signed-off-by: Jens Axboe <axboe@fb.com>