int nvme_ns_report_zones()

in host/zns.c [177:234]

• 49 lines of code
• 11 McCabe index (conditional complexity)

int nvme_ns_report_zones(struct nvme_ns *ns, sector_t sector,
		unsigned int nr_zones, report_zones_cb cb, void *data)
{
	struct nvme_zone_report *report;
	struct nvme_command c = { };
	int ret, zone_idx = 0;
	unsigned int nz, i;
	size_t buflen;

	if (ns->head->ids.csi != NVME_CSI_ZNS)
		return -EINVAL;

	report = nvme_zns_alloc_report_buffer(ns, nr_zones, &buflen);
	if (!report)
		return -ENOMEM;

	c.zmr.opcode = nvme_cmd_zone_mgmt_recv;
	c.zmr.nsid = cpu_to_le32(ns->head->ns_id);
	c.zmr.numd = cpu_to_le32(nvme_bytes_to_numd(buflen));
	c.zmr.zra = NVME_ZRA_ZONE_REPORT;
	c.zmr.zrasf = NVME_ZRASF_ZONE_REPORT_ALL;
	c.zmr.pr = NVME_REPORT_ZONE_PARTIAL;

	sector &= ~(ns->zsze - 1);
	while (zone_idx < nr_zones && sector < get_capacity(ns->disk)) {
		memset(report, 0, buflen);

		c.zmr.slba = cpu_to_le64(nvme_sect_to_lba(ns, sector));
		ret = nvme_submit_sync_cmd(ns->queue, &c, report, buflen);
		if (ret) {
			if (ret > 0)
				ret = -EIO;
			goto out_free;
		}

		nz = min((unsigned int)le64_to_cpu(report->nr_zones), nr_zones);
		if (!nz)
			break;

		for (i = 0; i < nz && zone_idx < nr_zones; i++) {
			ret = nvme_zone_parse_entry(ns, &report->entries[i],
						    zone_idx, cb, data);
			if (ret)
				goto out_free;
			zone_idx++;
		}

		sector += ns->zsze * nz;
	}

	if (zone_idx > 0)
		ret = zone_idx;
	else
		ret = -EINVAL;
out_free:
	kvfree(report);
	return ret;
}