block-6.1-2022-10-28

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Merge tag 'block-6.1-2022-10-28' of git://git.kernel.dk/linux

Pull block fixes from Jens Axboe:

 - NVMe pull request via Christoph:
      - make the multipath dma alignment match the non-multipath one
        (Keith Busch)
      - fix a bogus use of sg_init_marker() (Nam Cao)
      - fix circulr locking in nvme-tcp (Sagi Grimberg)

 - Initialization fix for requests allocated via the special hw queue
   allocator (John)

 - Fix for a regression added in this release with the batched
   completions of end_io backed requests (Ming)

 - Error handling leak fix for rbd (Yang)

 - Error handling leak fix for add_disk() failure (Yu)

* tag 'block-6.1-2022-10-28' of git://git.kernel.dk/linux:
  blk-mq: Properly init requests from blk_mq_alloc_request_hctx()
  blk-mq: don't add non-pt request with ->end_io to batch
  rbd: fix possible memory leak in rbd_sysfs_init()
  nvme-multipath: set queue dma alignment to 3
  nvme-tcp: fix possible circular locking when deleting a controller under memory pressure
  nvme-tcp: replace sg_init_marker() with sg_init_table()
  block: fix memory leak for elevator on add_disk failure

block/blk-mq.c

@@ -611,6 +611,7 @@ struct request *blk_mq_alloc_request_hctx(struct request_queue *q,
 		.nr_tags	= 1,
 	};
 	u64 alloc_time_ns = 0;
+	struct request *rq;
 	unsigned int cpu;
 	unsigned int tag;
 	int ret;
@@ -660,8 +661,12 @@ struct request *blk_mq_alloc_request_hctx(struct request_queue *q,
 	tag = blk_mq_get_tag(&data);
 	if (tag == BLK_MQ_NO_TAG)
 		goto out_queue_exit;
-	return blk_mq_rq_ctx_init(&data, blk_mq_tags_from_data(&data), tag,
+	rq = blk_mq_rq_ctx_init(&data, blk_mq_tags_from_data(&data), tag,
 					alloc_time_ns);
+	rq->__data_len = 0;
+	rq->__sector = (sector_t) -1;
+	rq->bio = rq->biotail = NULL;
+	return rq;
 
 out_queue_exit:
 	blk_queue_exit(q);

block/genhd.c

@@ -410,9 +410,10 @@ int __must_check device_add_disk(struct device *parent, struct gendisk *disk,
 	 * Otherwise just allocate the device numbers for both the whole device
 	 * and all partitions from the extended dev_t space.
 	 */
+	ret = -EINVAL;
 	if (disk->major) {
 		if (WARN_ON(!disk->minors))
-			return -EINVAL;
+			goto out_exit_elevator;
 
 		if (disk->minors > DISK_MAX_PARTS) {
 			pr_err("block: can't allocate more than %d partitions\n",
@@ -420,14 +421,14 @@ int __must_check device_add_disk(struct device *parent, struct gendisk *disk,
 			disk->minors = DISK_MAX_PARTS;
 		}
 		if (disk->first_minor + disk->minors > MINORMASK + 1)
-			return -EINVAL;
+			goto out_exit_elevator;
 	} else {
 		if (WARN_ON(disk->minors))
-			return -EINVAL;
+			goto out_exit_elevator;
 
 		ret = blk_alloc_ext_minor();
 		if (ret < 0)
-			return ret;
+			goto out_exit_elevator;
 		disk->major = BLOCK_EXT_MAJOR;
 		disk->first_minor = ret;
 	}
@@ -540,6 +541,9 @@ int __must_check device_add_disk(struct device *parent, struct gendisk *disk,
 out_free_ext_minor:
 	if (disk->major == BLOCK_EXT_MAJOR)
 		blk_free_ext_minor(disk->first_minor);
+out_exit_elevator:
+	if (disk->queue->elevator)
+		elevator_exit(disk->queue);
 	return ret;
 }
 EXPORT_SYMBOL(device_add_disk);

drivers/block/rbd.c

@@ -7222,8 +7222,10 @@ static int __init rbd_sysfs_init(void)
 	int ret;
 
 	ret = device_register(&rbd_root_dev);
-	if (ret < 0)
+	if (ret < 0) {
+		put_device(&rbd_root_dev);
 		return ret;
+	}
 
 	ret = bus_register(&rbd_bus_type);
 	if (ret < 0)

drivers/nvme/host/multipath.c

@@ -516,6 +516,7 @@ int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl, struct nvme_ns_head *head)
 	/* 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);
+	blk_queue_dma_alignment(head->disk->queue, 3);
 
 	/* we need to propagate up the VMC settings */
 	if (ctrl->vwc & NVME_CTRL_VWC_PRESENT)

drivers/nvme/host/tcp.c

@@ -387,7 +387,7 @@ static inline void nvme_tcp_ddgst_update(struct ahash_request *hash,
 {
 	struct scatterlist sg;
 
-	sg_init_marker(&sg, 1);
+	sg_init_table(&sg, 1);
 	sg_set_page(&sg, page, len, off);
 	ahash_request_set_crypt(hash, &sg, NULL, len);
 	crypto_ahash_update(hash);
@@ -1141,6 +1141,7 @@ static int nvme_tcp_try_send_ddgst(struct nvme_tcp_request *req)
 static int nvme_tcp_try_send(struct nvme_tcp_queue *queue)
 {
 	struct nvme_tcp_request *req;
+	unsigned int noreclaim_flag;
 	int ret = 1;
 
 	if (!queue->request) {
@@ -1150,12 +1151,13 @@ static int nvme_tcp_try_send(struct nvme_tcp_queue *queue)
 	}
 	req = queue->request;
 
+	noreclaim_flag = memalloc_noreclaim_save();
 	if (req->state == NVME_TCP_SEND_CMD_PDU) {
 		ret = nvme_tcp_try_send_cmd_pdu(req);
 		if (ret <= 0)
 			goto done;
 		if (!nvme_tcp_has_inline_data(req))
-			return ret;
+			goto out;
 	}
 
 	if (req->state == NVME_TCP_SEND_H2C_PDU) {
@@ -1181,6 +1183,8 @@ static int nvme_tcp_try_send(struct nvme_tcp_queue *queue)
 		nvme_tcp_fail_request(queue->request);
 		nvme_tcp_done_send_req(queue);
 	}
+out:
+	memalloc_noreclaim_restore(noreclaim_flag);
 	return ret;
 }
 
@@ -1296,6 +1300,7 @@ static void nvme_tcp_free_queue(struct nvme_ctrl *nctrl, int qid)
 	struct page *page;
 	struct nvme_tcp_ctrl *ctrl = to_tcp_ctrl(nctrl);
 	struct nvme_tcp_queue *queue = &ctrl->queues[qid];
+	unsigned int noreclaim_flag;
 
 	if (!test_and_clear_bit(NVME_TCP_Q_ALLOCATED, &queue->flags))
 		return;
@@ -1308,7 +1313,11 @@ static void nvme_tcp_free_queue(struct nvme_ctrl *nctrl, int qid)
 		__page_frag_cache_drain(page, queue->pf_cache.pagecnt_bias);
 		queue->pf_cache.va = NULL;
 	}
+
+	noreclaim_flag = memalloc_noreclaim_save();
 	sock_release(queue->sock);
+	memalloc_noreclaim_restore(noreclaim_flag);
+
 	kfree(queue->pdu);
 	mutex_destroy(&queue->send_mutex);
 	mutex_destroy(&queue->queue_lock);

include/linux/blk-mq.h

@@ -853,7 +853,8 @@ static inline bool blk_mq_add_to_batch(struct request *req,
 				       struct io_comp_batch *iob, int ioerror,
 				       void (*complete)(struct io_comp_batch *))
 {
-	if (!iob || (req->rq_flags & RQF_ELV) || ioerror)
+	if (!iob || (req->rq_flags & RQF_ELV) || ioerror ||
+			(req->end_io && !blk_rq_is_passthrough(req)))
 		return false;
 
 	if (!iob->complete)