lightnvm: make rrpc_map_page call nvm_get_blk outside locks
The nvm_get_blk() function is called with rlun->lock held. This is ok when the media manager implementation doesn't go out of its atomic context. However, if a media manager persists its metadata, and guarantees that the block is given to the target, this is no longer a viable approach. Therefore, clean up the flow of rrpc_map_page, and make sure that nvm_get_blk() is called without any locks acquired. Signed-off-by: NMatias Bjørling <m@bjorling.me> Signed-off-by: NJens Axboe <axboe@fb.com>
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