dm: convert to blk_alloc_disk/blk_cleanup_disk

Convert the dm driver to use the blk_alloc_disk and blk_cleanup_disk
helpers to simplify gendisk and request_queue allocation.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Link: https://lore.kernel.org/r/20210521055116.1053587-14-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index ca2aedd..3c7c2d2 100644 (file)
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1801,13 +1801,13 @@ static void cleanup_mapped_device(struct mapped_device *md)
                md->disk->private_data = NULL;
                spin_unlock(&_minor_lock);
                del_gendisk(md->disk);
-               put_disk(md->disk);
        }
 
-       if (md->queue) {
+       if (md->queue)
                dm_queue_destroy_keyslot_manager(md->queue);
-               blk_cleanup_queue(md->queue);
-       }
+
+       if (md->disk)
+               blk_cleanup_disk(md->disk);
 
        cleanup_srcu_struct(&md->io_barrier);
 
@@ -1869,13 +1869,10 @@ static struct mapped_device *alloc_dev(int minor)
         * established. If request-based table is loaded: blk-mq will
         * override accordingly.
         */
-       md->queue = blk_alloc_queue(numa_node_id);
-       if (!md->queue)
-               goto bad;
-
-       md->disk = alloc_disk_node(1, md->numa_node_id);
+       md->disk = blk_alloc_disk(md->numa_node_id);
        if (!md->disk)
                goto bad;
+       md->queue = md->disk->queue;
 
        init_waitqueue_head(&md->wait);
        INIT_WORK(&md->work, dm_wq_work);
@@ -1888,6 +1885,7 @@ static struct mapped_device *alloc_dev(int minor)
 
        md->disk->major = _major;
        md->disk->first_minor = minor;
+       md->disk->minors = 1;
        md->disk->fops = &dm_blk_dops;
        md->disk->queue = md->queue;
        md->disk->private_data = md;