block: remove direct_make_request

Now that submit_bio_noacct has a decent blk-mq fast path there is no
more need for this bypass.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/blk-core.c b/block/blk-core.c
index 2ff166f..bf882b8 100644 (file)
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1212,34 +1212,6 @@ blk_qc_t submit_bio_noacct(struct bio *bio)
 EXPORT_SYMBOL(submit_bio_noacct);
 
 /**
- * direct_make_request - hand a buffer directly to its device driver for I/O
- * @bio:  The bio describing the location in memory and on the device.
- *
- * This function behaves like submit_bio_noacct(), but does not protect
- * against recursion.  Must only be used if the called driver is known
- * to be blk-mq based.
- */
-blk_qc_t direct_make_request(struct bio *bio)
-{
-       struct gendisk *disk = bio->bi_disk;
-
-       if (WARN_ON_ONCE(!disk->queue->mq_ops)) {
-               bio_io_error(bio);
-               return BLK_QC_T_NONE;
-       }
-       if (!submit_bio_checks(bio))
-               return BLK_QC_T_NONE;
-       if (unlikely(bio_queue_enter(bio)))
-               return BLK_QC_T_NONE;
-       if (!blk_crypto_bio_prep(&bio)) {
-               blk_queue_exit(disk->queue);
-               return BLK_QC_T_NONE;
-       }
-       return blk_mq_submit_bio(bio);
-}
-EXPORT_SYMBOL_GPL(direct_make_request);
-
-/**
  * submit_bio - submit a bio to the block device layer for I/O
  * @bio: The &struct bio which describes the I/O
  *

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index b32b539..2cb3389 100644 (file)
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1302,10 +1302,7 @@ static blk_qc_t __map_bio(struct dm_target_io *tio)
                /* the bio has been remapped so dispatch it */
                trace_block_bio_remap(clone->bi_disk->queue, clone,
                                      bio_dev(io->orig_bio), sector);
-               if (md->type == DM_TYPE_NVME_BIO_BASED)
-                       ret = direct_make_request(clone);
-               else
-                       ret = submit_bio_noacct(clone);
+               ret = submit_bio_noacct(clone);
                break;
        case DM_MAPIO_KILL:
                free_tio(tio);

diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index f07fa47..a986ac5 100644 (file)
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -314,7 +314,7 @@ blk_qc_t nvme_ns_head_submit_bio(struct bio *bio)
                trace_block_bio_remap(bio->bi_disk->queue, bio,
                                      disk_devt(ns->head->disk),
                                      bio->bi_iter.bi_sector);
-               ret = direct_make_request(bio);
+               ret = submit_bio_noacct(bio);
        } else if (nvme_available_path(head)) {
                dev_warn_ratelimited(dev, "no usable path - requeuing I/O\n");
 

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index b73cfa6..1cc913f 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -853,7 +853,6 @@ static inline void rq_flush_dcache_pages(struct request *rq)
 extern int blk_register_queue(struct gendisk *disk);
 extern void blk_unregister_queue(struct gendisk *disk);
 blk_qc_t submit_bio_noacct(struct bio *bio);
-extern blk_qc_t direct_make_request(struct bio *bio);
 extern void blk_rq_init(struct request_queue *q, struct request *rq);
 extern void blk_put_request(struct request *);
 extern struct request *blk_get_request(struct request_queue *, unsigned int op,