nvme-multipath: convert to blk_alloc_disk/blk_cleanup_disk

Convert the nvme-multipath 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/20210521055116.1053587-19-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 9fcd050..31f3c4b 100644 (file)
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -472,7 +472,6 @@ static int pmem_attach_disk(struct device *dev,
                blk_queue_flag_set(QUEUE_FLAG_DAX, q);
 
        disk->fops              = &pmem_fops;
-       disk->queue             = q;
        disk->private_data      = pmem;
        nvdimm_namespace_disk_name(ndns, disk->disk_name);
        set_capacity(disk, (pmem->size - pmem->pfn_pad - pmem->data_offset)

diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index a5d02f2..b5fbdb4 100644 (file)
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -427,7 +427,6 @@ static void nvme_requeue_work(struct work_struct *work)
 
 int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl, struct nvme_ns_head *head)
 {
-       struct request_queue *q;
        bool vwc = false;
 
        mutex_init(&head->lock);
@@ -443,33 +442,24 @@ int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl, struct nvme_ns_head *head)
        if (!(ctrl->subsys->cmic & NVME_CTRL_CMIC_MULTI_CTRL) || !multipath)
                return 0;
 
-       q = blk_alloc_queue(ctrl->numa_node);
-       if (!q)
-               goto out;
-       blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
-       /* set to a default value for 512 until disk is validated */
-       blk_queue_logical_block_size(q, 512);
-       blk_set_stacking_limits(&q->limits);
-
-       /* we need to propagate up the VMC settings */
-       if (ctrl->vwc & NVME_CTRL_VWC_PRESENT)
-               vwc = true;
-       blk_queue_write_cache(q, vwc, vwc);
-
-       head->disk = alloc_disk(0);
+       head->disk = blk_alloc_disk(ctrl->numa_node);
        if (!head->disk)
-               goto out_cleanup_queue;
+               return -ENOMEM;
        head->disk->fops = &nvme_ns_head_ops;
        head->disk->private_data = head;
-       head->disk->queue = q;
        sprintf(head->disk->disk_name, "nvme%dn%d",
                        ctrl->subsys->instance, head->instance);
-       return 0;
 
-out_cleanup_queue:
-       blk_cleanup_queue(q);
-out:
-       return -ENOMEM;
+       blk_queue_flag_set(QUEUE_FLAG_NONROT, head->disk->queue);
+       /* set to a default value of 512 until the disk is validated */
+       blk_queue_logical_block_size(head->disk->queue, 512);
+       blk_set_stacking_limits(&head->disk->queue->limits);
+
+       /* we need to propagate up the VMC settings */
+       if (ctrl->vwc & NVME_CTRL_VWC_PRESENT)
+               vwc = true;
+       blk_queue_write_cache(head->disk->queue, vwc, vwc);
+       return 0;
 }
 
 static void nvme_mpath_set_live(struct nvme_ns *ns)
@@ -768,16 +758,7 @@ void nvme_mpath_remove_disk(struct nvme_ns_head *head)
        /* make sure all pending bios are cleaned up */
        kblockd_schedule_work(&head->requeue_work);
        flush_work(&head->requeue_work);
-       blk_cleanup_queue(head->disk->queue);
-       if (!test_bit(NVME_NSHEAD_DISK_LIVE, &head->flags)) {
-               /*
-                * if device_add_disk wasn't called, prevent
-                * disk release to put a bogus reference on the
-                * request queue
-                */
-               head->disk->queue = NULL;
-       }
-       put_disk(head->disk);
+       blk_cleanup_disk(head->disk);
 }
 
 void nvme_mpath_init_ctrl(struct nvme_ctrl *ctrl)