f2fs: pass the bio operation to bio_alloc_bioset

Refactor block I/O code so that the bio operation and known flags are set
at bio allocation time.  Only the later updated flags are updated on the
fly.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chao Yu <chao@kernel.org>
Link: https://lore.kernel.org/r/20220228124123.856027-3-hch@lst.de


Signed-off-by: Jens Axboe <axboe@kernel.dk>