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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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2
block/bio.c
View File

@ -1767,6 +1767,8 @@ int bioset_init_from_src(struct bio_set *bs, struct bio_set *src)
flags |= BIOSET_NEED_BVECS;
if (src->rescue_workqueue)
flags |= BIOSET_NEED_RESCUER;
if (src->cache)
flags |= BIOSET_PERCPU_CACHE;
return bioset_init(bs, src->bio_pool.min_nr, src->front_pad, flags);
}

6
block/blk.h
View File

@ -450,12 +450,6 @@ extern struct device_attribute dev_attr_events;
extern struct device_attribute dev_attr_events_async;
extern struct device_attribute dev_attr_events_poll_msecs;
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);
}
long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg);
long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg);

6
include/linux/bio.h
View File

@ -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);