loop: create a lo_can_use_dio helper
Factor out a part of __loop_update_dio in preparation for further refactoring. Signed-off-by:Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20250110073750.1582447-4-hch@lst.de Signed-off-by:
Jens Axboe <axboe@kernel.dk>
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