Improve static type checking by using the enum req_op type for request
operations.
Reviewed-by: NJohannes Thumshirn <jth@kernel.org>
Reviewed-by: NDamien Le Moal <damien.lemoal@opensource.wdc.com>
Cc: Naohiro Aota <naohiro.aota@wdc.com>
Signed-off-by: NBart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20220714180729.1065367-64-bvanassche@acm.orgSigned-off-by: NJens Axboe <axboe@kernel.dk>