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block: allow use of per-cpu bio alloc cache by block drivers

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Refine per-cpu bio alloc cache interfaces so that DM and other block
drivers can properly create and use the cache:

DM uses bioset_init_from_src() to do its final bioset initialization,
so must update bioset_init_from_src() to set BIOSET_PERCPU_CACHE if
%src bioset has a cache.

Also move bio_clear_polled() to include/linux/bio.h to allow users
outside of block core.

Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220324203526.62306-3-snitzer@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Mike Snitzer 2022-03-24 16:35:25 -04:00 • committed by Jens Axboe
parent 0df71650c0
commit b53f3dcd70
3 changed files with 8 additions and 6 deletions
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6
include/linux/bio.h
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@ -780,6 +780,12 @@ static inline void bio_set_polled(struct bio *bio, struct kiocb *kiocb)
bio->bi_opf |= REQ_NOWAIT;
}
static inline void bio_clear_polled(struct bio *bio)
{
/* can't support alloc cache if we turn off polling */
bio->bi_opf &= ~(REQ_POLLED | REQ_ALLOC_CACHE);
}
struct bio *blk_next_bio(struct bio *bio, struct block_device *bdev,
unsigned int nr_pages, unsigned int opf, gfp_t gfp);