Commit be3ff9c0 authored by Niklas Cassel's avatar Niklas Cassel Committed by Tomasz Zawadzki
Browse files

nvme: add function to get ZNS num zones 



Add a function to get the number of zones for a zoned namespace.

Since the ZNS specification does not allow zone size == 0,
divide by zero should not be possible on a spec compliant drive.

Signed-off-by: default avatarNiklas Cassel <niklas.cassel@wdc.com>
Change-Id: I15e0ac8a72e244e248b7fb44f7156b182ecd98b4
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/4792


Reviewed-by: default avatarJim Harris <james.r.harris@intel.com>
Reviewed-by: default avatarShuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Tested-by: default avatarSPDK CI Jenkins <sys_sgci@intel.com>
Community-CI: Broadcom CI
parent 6abee9a2

include/spdk/nvme_zns.h

+12 −0
Original line number Diff line number Diff line
@@ -72,6 +72,18 @@ const struct spdk_nvme_zns_ns_data *spdk_nvme_zns_ns_get_data(struct spdk_nvme_n 
 */

uint64_t spdk_nvme_zns_ns_get_zone_size(struct spdk_nvme_ns *ns);



/**

 * Get the number of zones for the given namespace.

 *

 * This function is thread safe and can be called at any point while the controller

 * is attached to the SPDK NVMe driver.

 *

 * \param ns Namespace to query.

 *

 * \return the number of zones.

 */

uint64_t spdk_nvme_zns_ns_get_num_zones(struct spdk_nvme_ns *ns);



/**

 * Get the Zoned Namespace Command Set Specific Identify Controller data

 * as defined by the NVMe Zoned Namespace Command Set Specification.

lib/nvme/nvme_zns.c

+6 −0
Original line number Diff line number Diff line
@@ -48,6 +48,12 @@ spdk_nvme_zns_ns_get_zone_size(struct spdk_nvme_ns *ns) 
	return nsdata_zns->lbafe[nsdata->flbas.format].zsze * spdk_nvme_ns_get_sector_size(ns);

}



uint64_t

spdk_nvme_zns_ns_get_num_zones(struct spdk_nvme_ns *ns)

{

	return spdk_nvme_ns_get_size(ns) / spdk_nvme_zns_ns_get_zone_size(ns);

}



const struct spdk_nvme_zns_ctrlr_data *

spdk_nvme_zns_ctrlr_get_data(struct spdk_nvme_ctrlr *ctrlr)

{

lib/nvme/spdk_nvme.map

+1 −0
Original line number Diff line number Diff line
@@ -161,6 +161,7 @@ 
	# public functions from nvme_zns.h

	spdk_nvme_zns_ns_get_data;

	spdk_nvme_zns_ns_get_zone_size;

	spdk_nvme_zns_ns_get_num_zones;

	spdk_nvme_zns_ctrlr_get_data;

	spdk_nvme_zns_close_zone;

	spdk_nvme_zns_finish_zone;