block: enable use of bio allocation cache

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>

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 9ef4f1fc2cb0186c43066826c130fac24e5cf4e1..798bb9d8f53383cf538ca4675e9fb672fe589a49 100644 (file)
--- 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);