blk-mq: Export freeze/unfreeze functions
Let drivers prevent entering a queue that isn't available. Signed-off-by: NKeith Busch <keith.busch@intel.com> Signed-off-by: NJens Axboe <axboe@fb.com>
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Let drivers prevent entering a queue that isn't available. Signed-off-by: NKeith Busch <keith.busch@intel.com> Signed-off-by: NJens Axboe <axboe@fb.com>