Re: [PATCH 4/4] nvme: wire up async polling for io passthrough commands

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On Fri, Aug 05, 2022 at 11:03:55AM -0600, Jens Axboe wrote:
On 8/5/22 9:42 AM, Kanchan Joshi wrote:
@@ -685,6 +721,29 @@ int nvme_ns_head_chr_uring_cmd(struct io_uring_cmd *ioucmd,
 	srcu_read_unlock(&head->srcu, srcu_idx);
 	return ret;
 }
+
+int nvme_ns_head_chr_uring_cmd_iopoll(struct io_uring_cmd *ioucmd)
+{
+	struct cdev *cdev = file_inode(ioucmd->file)->i_cdev;
+	struct nvme_ns_head *head = container_of(cdev, struct nvme_ns_head, cdev);
+	int srcu_idx = srcu_read_lock(&head->srcu);
+	struct nvme_ns *ns = nvme_find_path(head);
+	struct bio *bio;
+	int ret = 0;
+	struct request_queue *q;
+
+	if (ns) {
+		rcu_read_lock();
+		bio = READ_ONCE(ioucmd->private);
+		q = ns->queue;
+		if (test_bit(QUEUE_FLAG_POLL, &q->queue_flags) && bio
+				&& bio->bi_bdev)
+			ret = bio_poll(bio, 0, 0);
+		rcu_read_unlock();
+	}
+	srcu_read_unlock(&head->srcu, srcu_idx);
+	return ret;
+}
 #endif /* CONFIG_NVME_MULTIPATH */

Looks like that READ_ONCE() should be:

	bio = READ_ONCE(ioucmd->cookie);

?
Damn, indeed. Would have caught if I had compiled this with
NVME_MULTIPATH config enabled. Thanks for the catch.





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