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Improve static type checking by changing the type of the value returned by req_op() and bio_op() from unsigned int into enum req_op. Insert 'default: break;' in switch statements on the enum req_op type to prevent that the compiler warns about these switch statements. Cc: Christoph Hellwig <[email protected]> Cc: Ming Lei <[email protected]> Cc: Hannes Reinecke <[email protected]> Cc: Damien Le Moal <[email protected]> Cc: Johannes Thumshirn <[email protected]> Cc: Tim Waugh <[email protected]> Cc: Alasdair Kergon <[email protected]> Cc: Mike Snitzer <[email protected]> Cc: Mikulas Patocka <[email protected]> Signed-off-by: Bart Van Assche <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>