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bio: split pcpu cache part of bio_put into a helper 

Extract a helper out of bio_put for recycling into percpu caches.
It's a preparation patch without functional changes.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/e97ab2026a89098ee1bfdd09bcb9451fced95f87.1667384020.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2022-11-02 15:18:21 +00:00 committed by Jens Axboe
parent 759aa12f19
commit f25cf75a45
1 changed files with 25 additions and 13 deletions
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38
block/bio.c
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@ -727,6 +727,28 @@ static void bio_alloc_cache_destroy(struct bio_set *bs)
bs->cache = NULL;
}
static inline void bio_put_percpu_cache(struct bio *bio)
{
struct bio_alloc_cache *cache;
cache = per_cpu_ptr(bio->bi_pool->cache, get_cpu());
bio_uninit(bio);
if ((bio->bi_opf & REQ_POLLED) && !WARN_ON_ONCE(in_interrupt())) {
bio->bi_next = cache->free_list;
cache->free_list = bio;
cache->nr++;
} else {
put_cpu();
bio_free(bio);
return;
}
if (cache->nr > ALLOC_CACHE_MAX + ALLOC_CACHE_SLACK)
bio_alloc_cache_prune(cache, ALLOC_CACHE_SLACK);
put_cpu();
}
/**
* bio_put - release a reference to a bio
* @bio: bio to release reference to
@ -742,20 +764,10 @@ void bio_put(struct bio *bio)
if (!atomic_dec_and_test(&bio->__bi_cnt))
return;
}
if ((bio->bi_opf & REQ_ALLOC_CACHE) && !WARN_ON_ONCE(in_interrupt())) {
struct bio_alloc_cache *cache;
bio_uninit(bio);
cache = per_cpu_ptr(bio->bi_pool->cache, get_cpu());
bio->bi_next = cache->free_list;
cache->free_list = bio;
if (++cache->nr > ALLOC_CACHE_MAX + ALLOC_CACHE_SLACK)
bio_alloc_cache_prune(cache, ALLOC_CACHE_SLACK);
put_cpu();
} else {
if (bio->bi_opf & REQ_ALLOC_CACHE)
bio_put_percpu_cache(bio);
else
bio_free(bio);
}
}
EXPORT_SYMBOL(bio_put);