lightnvm: introduce ioctl to initialize device
Based on the previous patch, we now introduce an ioctl to initialize the device using nvm_init_sysblock and create the necessary system blocks. The user may specify the media manager that they wish to instantiate on top. Default from user-space will be "gennvm". Signed-off-by: Matias Bjørling <m@bjorling.me> Signed-off-by: Jens Axboe <axboe@fb.com>
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