static int nvme_submit_user_cmd()

in host/ioctl.c [56:110]

• 51 lines of code
• 18 McCabe index (conditional complexity)

static int nvme_submit_user_cmd(struct request_queue *q,
		struct nvme_command *cmd, void __user *ubuffer,
		unsigned bufflen, void __user *meta_buffer, unsigned meta_len,
		u32 meta_seed, u64 *result, unsigned timeout)
{
	bool write = nvme_is_write(cmd);
	struct nvme_ns *ns = q->queuedata;
	struct block_device *bdev = ns ? ns->disk->part0 : NULL;
	struct request *req;
	struct bio *bio = NULL;
	void *meta = NULL;
	int ret;

	req = nvme_alloc_request(q, cmd, 0);
	if (IS_ERR(req))
		return PTR_ERR(req);

	if (timeout)
		req->timeout = timeout;
	nvme_req(req)->flags |= NVME_REQ_USERCMD;

	if (ubuffer && bufflen) {
		ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen,
				GFP_KERNEL);
		if (ret)
			goto out;
		bio = req->bio;
		if (bdev)
			bio_set_dev(bio, bdev);
		if (bdev && meta_buffer && meta_len) {
			meta = nvme_add_user_metadata(bio, meta_buffer, meta_len,
					meta_seed, write);
			if (IS_ERR(meta)) {
				ret = PTR_ERR(meta);
				goto out_unmap;
			}
			req->cmd_flags |= REQ_INTEGRITY;
		}
	}

	ret = nvme_execute_passthru_rq(req);
	if (result)
		*result = le64_to_cpu(nvme_req(req)->result.u64);
	if (meta && !ret && !write) {
		if (copy_to_user(meta_buffer, meta, meta_len))
			ret = -EFAULT;
	}
	kfree(meta);
 out_unmap:
	if (bio)
		blk_rq_unmap_user(bio);
 out:
	blk_mq_free_request(req);
	return ret;
}