[PATCH 6/6] block: enable use of bio allocation cache

[Jens Axboe <axboe@kernel.dk>]

Initialize the bio_set used for IO with per-cpu bio caching enabled,
and use the new bio_alloc_kiocb() helper to dip into that cache.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 fs/block_dev.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 9ef4f1fc2cb0..798bb9d8f533 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -385,7 +385,7 @@ static ssize_t __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
 	    (bdev_logical_block_size(bdev) - 1))
 		return -EINVAL;
 
-	bio = bio_alloc_bioset(GFP_KERNEL, nr_pages, &blkdev_dio_pool);
+	bio = bio_alloc_kiocb(iocb, GFP_KERNEL, nr_pages, &blkdev_dio_pool);
 
 	dio = container_of(bio, struct blkdev_dio, bio);
 	dio->is_sync = is_sync = is_sync_kiocb(iocb);
@@ -513,7 +513,9 @@ blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 
 static __init int blkdev_init(void)
 {
-	return bioset_init(&blkdev_dio_pool, 4, offsetof(struct blkdev_dio, bio), BIOSET_NEED_BVECS);
+	return bioset_init(&blkdev_dio_pool, 4,
+				offsetof(struct blkdev_dio, bio),
+				BIOSET_NEED_BVECS|BIOSET_PERCPU_CACHE);
 }
 module_init(blkdev_init);
 
-- 
2.32.0