On 2020/11/30 12:29, Chaitanya Kulkarni wrote:
> Add zns-bdev-config, id-ctrl, id-ns, zns-cmd-effects, zone-mgmt-send,
> zone-mgmt-recv and zone-append handlers for NVMeOF target to enable ZNS
> support for bdev.
>
> Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@xxxxxxx>
> ---
> drivers/nvme/target/Makefile | 2 +-
> drivers/nvme/target/admin-cmd.c | 4 +-
> drivers/nvme/target/io-cmd-file.c | 2 +-
> drivers/nvme/target/nvmet.h | 19 ++
> drivers/nvme/target/zns.c | 463 ++++++++++++++++++++++++++++++
> 5 files changed, 486 insertions(+), 4 deletions(-)
> create mode 100644 drivers/nvme/target/zns.c
>
> diff --git a/drivers/nvme/target/Makefile b/drivers/nvme/target/Makefile
> index ebf91fc4c72e..d050f829b43a 100644
> --- a/drivers/nvme/target/Makefile
> +++ b/drivers/nvme/target/Makefile
> @@ -10,7 +10,7 @@ obj-$(CONFIG_NVME_TARGET_FCLOOP) += nvme-fcloop.o
> obj-$(CONFIG_NVME_TARGET_TCP) += nvmet-tcp.o
>
> nvmet-y += core.o configfs.o admin-cmd.o fabrics-cmd.o \
> - discovery.o io-cmd-file.o io-cmd-bdev.o
> + zns.o discovery.o io-cmd-file.o io-cmd-bdev.o
> nvmet-$(CONFIG_NVME_TARGET_PASSTHRU) += passthru.o
> nvme-loop-y += loop.o
> nvmet-rdma-y += rdma.o
> diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c
> index dca34489a1dc..509fd8dcca0c 100644
> --- a/drivers/nvme/target/admin-cmd.c
> +++ b/drivers/nvme/target/admin-cmd.c
> @@ -579,8 +579,8 @@ static void nvmet_execute_identify_nslist(struct nvmet_req *req)
> nvmet_req_complete(req, status);
> }
>
> -static u16 nvmet_copy_ns_identifier(struct nvmet_req *req, u8 type, u8 len,
> - void *id, off_t *off)
> +u16 nvmet_copy_ns_identifier(struct nvmet_req *req, u8 type, u8 len,
> + void *id, off_t *off)
> {
> struct nvme_ns_id_desc desc = {
> .nidt = type,
> diff --git a/drivers/nvme/target/io-cmd-file.c b/drivers/nvme/target/io-cmd-file.c
> index 0abbefd9925e..2bd10960fa50 100644
> --- a/drivers/nvme/target/io-cmd-file.c
> +++ b/drivers/nvme/target/io-cmd-file.c
> @@ -89,7 +89,7 @@ int nvmet_file_ns_enable(struct nvmet_ns *ns)
> return ret;
> }
>
> -static void nvmet_file_init_bvec(struct bio_vec *bv, struct scatterlist *sg)
> +void nvmet_file_init_bvec(struct bio_vec *bv, struct scatterlist *sg)
> {
> bv->bv_page = sg_page(sg);
> bv->bv_offset = sg->offset;
> diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h
> index 592763732065..eee7866ae512 100644
> --- a/drivers/nvme/target/nvmet.h
> +++ b/drivers/nvme/target/nvmet.h
> @@ -81,6 +81,10 @@ struct nvmet_ns {
> struct pci_dev *p2p_dev;
> int pi_type;
> int metadata_size;
> +#ifdef CONFIG_BLK_DEV_ZONED
> + struct nvme_id_ns_zns id_zns;
> + unsigned int zasl;
> +#endif
> };
>
> static inline struct nvmet_ns *to_nvmet_ns(struct config_item *item)
> @@ -251,6 +255,10 @@ struct nvmet_subsys {
> unsigned int admin_timeout;
> unsigned int io_timeout;
> #endif /* CONFIG_NVME_TARGET_PASSTHRU */
> +
> +#ifdef CONFIG_BLK_DEV_ZONED
> + struct nvme_id_ctrl_zns id_ctrl_zns;
> +#endif
> };
>
> static inline struct nvmet_subsys *to_subsys(struct config_item *item)
> @@ -603,4 +611,15 @@ static inline bool nvmet_ns_has_pi(struct nvmet_ns *ns)
> return ns->pi_type && ns->metadata_size == sizeof(struct t10_pi_tuple);
> }
>
> +void nvmet_execute_identify_cns_cs_ctrl(struct nvmet_req *req);
> +void nvmet_execute_identify_cns_cs_ns(struct nvmet_req *req);
> +u16 nvmet_process_zns_cis(struct nvmet_req *req, off_t *off);
> +bool nvmet_bdev_zns_enable(struct nvmet_ns *ns);
> +void nvmet_bdev_execute_zone_mgmt_recv(struct nvmet_req *req);
> +void nvmet_bdev_execute_zone_mgmt_send(struct nvmet_req *req);
> +void nvmet_bdev_execute_zone_append(struct nvmet_req *req);
> +void nvmet_zns_add_cmd_effects(struct nvme_effects_log *log);
> +u16 nvmet_copy_ns_identifier(struct nvmet_req *req, u8 type, u8 len,
> + void *id, off_t *off);
> +void nvmet_file_init_bvec(struct bio_vec *bv, struct scatterlist *sg);
> #endif /* _NVMET_H */
> diff --git a/drivers/nvme/target/zns.c b/drivers/nvme/target/zns.c
> new file mode 100644
> index 000000000000..40dedfd51fd6
> --- /dev/null
> +++ b/drivers/nvme/target/zns.c
> @@ -0,0 +1,463 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * NVMe ZNS-ZBD command implementation.
> + * Copyright (c) 2020-2021 HGST, a Western Digital Company.
> + */
> +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> +#include <linux/uio.h>
> +#include <linux/nvme.h>
> +#include <linux/xarray.h>
> +#include <linux/blkdev.h>
> +#include <linux/module.h>
> +#include "nvmet.h"
> +
> +#ifdef CONFIG_BLK_DEV_ZONED
> +#define NVMET_MPSMIN_SHIFT 12
> +
> +static u16 nvmet_bdev_zns_checks(struct nvmet_req *req)
> +{
> + u16 status = 0;
> +
> + if (!bdev_is_zoned(req->ns->bdev)) {
> + status = NVME_SC_INVALID_NS | NVME_SC_DNR;
> + goto out;
> + }
> +
> + if (req->cmd->zmr.zra != NVME_ZRA_ZONE_REPORT) {
> + status = NVME_SC_INVALID_FIELD;
> + goto out;
> + }
> +
> + if (req->cmd->zmr.zrasf != NVME_ZRASF_ZONE_REPORT_ALL) {
> + status = NVME_SC_INVALID_FIELD;
> + goto out;
> + }
> +
> + if (req->cmd->zmr.pr != NVME_REPORT_ZONE_PARTIAL)
> + status = NVME_SC_INVALID_FIELD;
> +out:
> + return status;
> +}
> +
> +static inline struct block_device *nvmet_bdev(struct nvmet_req *req)
> +{
> + return req->ns->bdev;
> +}
> +
> +static inline u64 nvmet_zones_to_desc_size(unsigned int nr_zones)
> +{
> + return sizeof(struct nvme_zone_report) +
> + (sizeof(struct nvme_zone_descriptor) * nr_zones);
> +}
> +
> +static inline u64 nvmet_sect_to_lba(struct nvmet_ns *ns, sector_t sect)
> +{
> + return sect >> (ns->blksize_shift - SECTOR_SHIFT);
> +}
> +
> +static inline sector_t nvmet_lba_to_sect(struct nvmet_ns *ns, __le64 lba)
> +{
> + return le64_to_cpu(lba) << (ns->blksize_shift - SECTOR_SHIFT);
> +}
> +
> +/*
> + * ZNS related command implementation and helpers.
> + */
> +
> +u16 nvmet_process_zns_cis(struct nvmet_req *req, off_t *off)
> +{
> + u16 nvme_cis_zns = NVME_CSI_ZNS;
> +
> + if (!bdev_is_zoned(nvmet_bdev(req)))
> + return NVME_SC_SUCCESS;
> +
> + return nvmet_copy_ns_identifier(req, NVME_NIDT_CSI, NVME_NIDT_CSI_LEN,
> + &nvme_cis_zns, off);
> +}
> +
> +void nvmet_zns_add_cmd_effects(struct nvme_effects_log *log)
> +{
> + log->iocs[nvme_cmd_zone_append] = cpu_to_le32(1 << 0);
> + log->iocs[nvme_cmd_zone_mgmt_send] = cpu_to_le32(1 << 0);
> + log->iocs[nvme_cmd_zone_mgmt_recv] = cpu_to_le32(1 << 0);
> +}
> +
> +static int nvmet_bdev_validate_zns_zones_cb(struct blk_zone *z,
> + unsigned int idx, void *data)
> +{
> + struct blk_zone *zone = data;
> +
> + memcpy(zone, z, sizeof(struct blk_zone));
> +
> + return 0;
> +}
> +
> +static inline bool nvmet_bdev_validate_zns_zones(struct nvmet_ns *ns)
> +{
> + sector_t last_sect = get_capacity(ns->bdev->bd_disk) - 1;
> + struct blk_zone last_zone, first_zone;
> + int reported_zones;
> +
> + reported_zones = blkdev_report_zones(ns->bdev, 0, 1,
> + nvmet_bdev_validate_zns_zones_cb,
> + &first_zone);
> + if (reported_zones != 1)
> + return false;
> +
> + reported_zones = blkdev_report_zones(ns->bdev, last_sect, 1,
> + nvmet_bdev_validate_zns_zones_cb,
> + &last_zone);
> + if (reported_zones != 1)
> + return false;
> +
> + return first_zone.capacity == last_zone.capacity ? true : false;
> +}
That is really heavy handed... Why not just simply:
return !(get_capacity(ns->bdev->bd_disk) & (bdev_zone_sectors(ns->bdev) - 1));
That does the same: true if capacity is a multiple of the zone size (no runt
zone), false otherwise.
> +
> +static inline u8 nvmet_zasl(unsigned int zone_append_sects)
> +{
> + unsigned int npages = (zone_append_sects << 9) >> NVMET_MPSMIN_SHIFT;
> + u8 zasl = ilog2(npages);
> +
> + /*
> + * Zone Append Size Limit is the value experessed in the units
> + * of minimum memory page size (i.e. 12) and is reported power of 2.
> + */
> + return zasl;
Why not just:
return ilog2((zone_append_sects << 9) >> NVMET_MPSMIN_SHIFT);
And are you sure that there is no possibility that the u8 type overflows here ?
> +}
> +
> +static inline void nvmet_zns_update_zasl(struct nvmet_ns *ns)
> +{
> + u8 bio_max_zasl = nvmet_zasl((BIO_MAX_PAGES * PAGE_SIZE) >> 9);
> + struct request_queue *q = ns->bdev->bd_disk->queue;
> + struct nvmet_ns *ins;
> + unsigned long idx;
> + u8 min_zasl;
> +
> + /*
> + * Calculate new ctrl->zasl value when enabling the new ns. This value
> + * has to be the minimum of the max_zone appned values from available
s/appned/append
> + * namespaces.
> + */
> + min_zasl = ns->zasl = nvmet_zasl(queue_max_zone_append_sectors(q));
> +
> + xa_for_each(&(ns->subsys->namespaces), idx, ins) {
> + struct request_queue *iq = ins->bdev->bd_disk->queue;
> + unsigned int imax_za_sects = queue_max_zone_append_sectors(iq);
> + u8 izasl = nvmet_zasl(imax_za_sects);
> +
> + if (!bdev_is_zoned(ins->bdev))
> + continue;
> +
> + min_zasl = min_zasl > izasl ? izasl : min_zasl;
> + }
> +
> + ns->subsys->id_ctrl_zns.zasl = min_t(u8, min_zasl, bio_max_zasl);
I do not understand what bio_max_zasl is used for here, as it does not represent
anything related to the zoned namespaces backends.
> +}> +
> +bool nvmet_bdev_zns_enable(struct nvmet_ns *ns)
> +{
> + if (ns->bdev->bd_disk->queue->conv_zones_bitmap) {
> + pr_err("block devices with conventional zones are not supported.");
> + return false;
> + }
It may be better to move this test in nvmet_bdev_validate_zns_zones(), so that
all backend zone configuration checks are together.
> +
> + if (!nvmet_bdev_validate_zns_zones(ns))
> + return false;
> +
> + /*
> + * For ZBC and ZAC devices, writes into sequential zones must be aligned
> + * to the device physical block size. So use this value as the logical
> + * block size to avoid errors.
> + */
> + ns->blksize_shift = blksize_bits(bdev_physical_block_size(ns->bdev));
> +
> + nvmet_zns_update_zasl(ns);
> +
> + return true;
> +}
> +
> +/*
> + * ZNS related Admin and I/O command handlers.
> + */
> +void nvmet_execute_identify_cns_cs_ctrl(struct nvmet_req *req)
> +{
> + struct nvmet_ctrl *ctrl = req->sq->ctrl;
> + struct nvme_id_ctrl_zns *id;
> + u16 status = 0;
> + u8 mdts;
> +
> + id = kzalloc(sizeof(*id), GFP_KERNEL);
> + if (!id) {
> + status = NVME_SC_INTERNAL;
> + goto out;
> + }
> +
> + /*
> + * Even though this function sets Zone Append Size Limit to 0,
> + * the 0 value here indicates that the maximum data transfer size for
> + * the Zone Append command is indicated by the ctrl
> + * Maximum Data Transfer Size (MDTS).
> + */
I do not understand this comment. It does not really exactly match what the code
below is doing.
> +
> + mdts = ctrl->ops->get_mdts ? ctrl->ops->get_mdts(ctrl) : 0;
> +
> + id->zasl = min_t(u8, mdts, req->sq->ctrl->subsys->id_ctrl_zns.zasl);
> +
> + status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id));
> +
> + kfree(id);
> +out:
> + nvmet_req_complete(req, status);
> +}
> +
> +void nvmet_execute_identify_cns_cs_ns(struct nvmet_req *req)
> +{
> + struct nvme_id_ns_zns *id_zns;
> + u16 status = 0;
> + u64 zsze;
> +
> + if (le32_to_cpu(req->cmd->identify.nsid) == NVME_NSID_ALL) {
> + req->error_loc = offsetof(struct nvme_identify, nsid);
> + status = NVME_SC_INVALID_NS | NVME_SC_DNR;
> + goto out;
> + }
> +
> + id_zns = kzalloc(sizeof(*id_zns), GFP_KERNEL);
> + if (!id_zns) {
> + status = NVME_SC_INTERNAL;
> + goto out;
> + }
> +
> + req->ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->identify.nsid);
> + if (!req->ns) {
> + status = NVME_SC_INTERNAL;
> + goto done;
> + }
> +
> + if (!bdev_is_zoned(nvmet_bdev(req))) {
> + req->error_loc = offsetof(struct nvme_identify, nsid);
> + status = NVME_SC_INVALID_NS | NVME_SC_DNR;
> + goto done;
> + }
> +
> + nvmet_ns_revalidate(req->ns);
> + zsze = (bdev_zone_sectors(nvmet_bdev(req)) << 9) >>
> + req->ns->blksize_shift;
> + id_zns->lbafe[0].zsze = cpu_to_le64(zsze);
> + id_zns->mor = cpu_to_le32(bdev_max_open_zones(nvmet_bdev(req)));
> + id_zns->mar = cpu_to_le32(bdev_max_active_zones(nvmet_bdev(req)));
> +
> +done:
> + status = nvmet_copy_to_sgl(req, 0, id_zns, sizeof(*id_zns));
> + kfree(id_zns);
> +out:
> + nvmet_req_complete(req, status);
> +}
> +
> +struct nvmet_report_zone_data {
> + struct nvmet_ns *ns;
> + struct nvme_zone_report *rz;
> +};
> +
> +static int nvmet_bdev_report_zone_cb(struct blk_zone *z, unsigned int idx,
> + void *data)
> +{
> + struct nvmet_report_zone_data *report_zone_data = data;
> + struct nvme_zone_descriptor *entries = report_zone_data->rz->entries;
> + struct nvmet_ns *ns = report_zone_data->ns;
> +
> + entries[idx].zcap = cpu_to_le64(nvmet_sect_to_lba(ns, z->capacity));
> + entries[idx].zslba = cpu_to_le64(nvmet_sect_to_lba(ns, z->start));
> + entries[idx].wp = cpu_to_le64(nvmet_sect_to_lba(ns, z->wp));
> + entries[idx].za = z->reset ? 1 << 2 : 0;
> + entries[idx].zt = z->type;
> + entries[idx].zs = z->cond << 4;
> +
> + return 0;
> +}
> +
> +void nvmet_bdev_execute_zone_mgmt_recv(struct nvmet_req *req)
> +{
> + u32 bufsize = (le32_to_cpu(req->cmd->zmr.numd) + 1) << 2;
size_t ?
> + struct nvmet_report_zone_data data = { .ns = req->ns };
> + struct nvme_zone_mgmt_recv_cmd *zmr = &req->cmd->zmr;
> + sector_t sect = nvmet_lba_to_sect(req->ns, le64_to_cpu(zmr->slba));
> + unsigned int nr_zones = bufsize / nvmet_zones_to_desc_size(1);
I think this is wrong since nvmet_zones_to_desc_size includes sizeof(struct
nvme_zone_report). I think what you want here is:
nr_zones = (bufsize - sizeof(struct nvme_zone_report)) /
sizeof(struct nvme_zone_descriptor);
And then you can get rid of nvmet_zones_to_desc_size();
> + int reported_zones;
> + u16 status;
> +
> + status = nvmet_bdev_zns_checks(req);
> + if (status)
> + goto out;
> +
> + data.rz = __vmalloc(bufsize, GFP_KERNEL | __GFP_NORETRY);
> + if (!data.rz) {
> + status = NVME_SC_INTERNAL;
> + goto out;
> + }
> +
> + reported_zones = blkdev_report_zones(nvmet_bdev(req), sect, nr_zones,
> + nvmet_bdev_report_zone_cb,
> + &data);
> + if (reported_zones < 0) {
> + status = NVME_SC_INTERNAL;
> + goto out_free_report_zones;
> + }
> +
> + data.rz->nr_zones = cpu_to_le64(reported_zones);
> +
> + status = nvmet_copy_to_sgl(req, 0, data.rz, bufsize);
> +
> +out_free_report_zones:
> + kvfree(data.rz);
> +out:
> + nvmet_req_complete(req, status);
> +}
> +
> +void nvmet_bdev_execute_zone_mgmt_send(struct nvmet_req *req)
> +{
> + sector_t nr_sect = bdev_zone_sectors(nvmet_bdev(req));
> + struct nvme_zone_mgmt_send_cmd *c = &req->cmd->zms;
> + enum req_opf op = REQ_OP_LAST;
> + u16 status = NVME_SC_SUCCESS;
> + sector_t sect;
> + int ret;
> +
> + sect = nvmet_lba_to_sect(req->ns, le64_to_cpu(req->cmd->zms.slba));
> +
> + switch (c->zsa) {
> + case NVME_ZONE_OPEN:
> + op = REQ_OP_ZONE_OPEN;
> + break;
> + case NVME_ZONE_CLOSE:
> + op = REQ_OP_ZONE_CLOSE;
> + break;
> + case NVME_ZONE_FINISH:
> + op = REQ_OP_ZONE_FINISH;
> + break;
> + case NVME_ZONE_RESET:
> + if (c->select_all)
> + nr_sect = get_capacity(nvmet_bdev(req)->bd_disk);
> + op = REQ_OP_ZONE_RESET;
> + break;
> + default:
> + status = NVME_SC_INVALID_FIELD;
> + goto out;
> + }
> +
> + ret = blkdev_zone_mgmt(nvmet_bdev(req), op, sect, nr_sect, GFP_KERNEL);
> + if (ret)
> + status = NVME_SC_INTERNAL;
> +
> +out:
> + nvmet_req_complete(req, status);
> +}
> +
> +void nvmet_bdev_execute_zone_append(struct nvmet_req *req)
> +{
> + unsigned long bv_cnt = req->sg_cnt;
> + int op = REQ_OP_ZONE_APPEND | REQ_SYNC | REQ_IDLE;
> + u64 slba = le64_to_cpu(req->cmd->rw.slba);
> + sector_t sect = nvmet_lba_to_sect(req->ns, slba);
> + u16 status = NVME_SC_SUCCESS;
> + size_t mapped_data_len = 0;
> + int sg_cnt = req->sg_cnt;
> + struct scatterlist *sg;
> + struct iov_iter from;
> + struct bio_vec *bvec;
> + size_t mapped_cnt;
> + struct bio *bio;
> + int ret;
> +
> + if (!nvmet_check_transfer_len(req, nvmet_rw_data_len(req)))
> + return;
> +
> + /*
> + * When setting the ctrl->zasl we consider the BIO_MAX_PAGES so that we
> + * don't have to split the bio, i.e. we shouldn't get
> + * sg_cnt > BIO_MAX_PAGES since zasl on the host will limit the I/Os
> + * with the size that considers the BIO_MAX_PAGES.
> + */
What ? Unclear... You advertize max zone append as ctrl->zasl = min(all ns max
zone append sectors). What does BIO_MAX_PAGES has to do with anything ?
> + if (!req->sg_cnt)
> + goto out;
> +
> + if (WARN_ON(req->sg_cnt > BIO_MAX_PAGES)) {
> + status = NVME_SC_INTERNAL | NVME_SC_DNR;
> + goto out;
> + }
> +
> + bvec = kmalloc_array(bv_cnt, sizeof(*bvec), GFP_KERNEL);
> + if (!bvec) {
> + status = NVME_SC_INTERNAL | NVME_SC_DNR;
> + goto out;
> + }
> +
> + for_each_sg(req->sg, sg, req->sg_cnt, mapped_cnt) {
> + nvmet_file_init_bvec(bvec, sg);
> + mapped_data_len += bvec[mapped_cnt].bv_len;
> + sg_cnt--;
> + if (mapped_cnt == bv_cnt)
> + break;
> + }
> +
> + if (WARN_ON(sg_cnt)) {
> + status = NVME_SC_INTERNAL | NVME_SC_DNR;
> + goto out;
> + }
> +
> + iov_iter_bvec(&from, WRITE, bvec, mapped_cnt, mapped_data_len);
> +
> + bio = bio_alloc(GFP_KERNEL, bv_cnt);
> + bio_set_dev(bio, nvmet_bdev(req));
> + bio->bi_iter.bi_sector = sect;
> + bio->bi_opf = op;
The op variable is used only here. It is not necessary.
> +
> + ret = __bio_iov_append_get_pages(bio, &from);
I still do not see why bio_iov_iter_get_pages() does not work here. Would you
care to explain please ?
> + if (unlikely(ret)) {
> + status = NVME_SC_INTERNAL | NVME_SC_DNR;
> + bio_io_error(bio);
> + goto bvec_free;
> + }
> +
> + ret = submit_bio_wait(bio);
> + status = ret < 0 ? NVME_SC_INTERNAL : status;
> + bio_put(bio);
> +
> + sect += (mapped_data_len >> 9);
> + req->cqe->result.u64 = le64_to_cpu(nvmet_sect_to_lba(req->ns, sect));
> +
> +bvec_free:
> + kfree(bvec);
> +
> +out:
> + nvmet_req_complete(req, status);
> +}
> +
> +#else /* CONFIG_BLK_DEV_ZONED */
> +void nvmet_execute_identify_cns_cs_ctrl(struct nvmet_req *req)
> +{
> +}
> +void nvmet_execute_identify_cns_cs_ns(struct nvmet_req *req)
> +{
> +}
> +u16 nvmet_process_zns_cis(struct nvmet_req *req, off_t *off)
> +{
> + return 0;
> +}
> +bool nvmet_bdev_zns_config(struct nvmet_ns *ns)
> +{
> + return false;
> +}
> +void nvmet_bdev_execute_zone_mgmt_recv(struct nvmet_req *req)
> +{
> +}
> +void nvmet_bdev_execute_zone_mgmt_send(struct nvmet_req *req)
> +{
> +}
> +void nvmet_bdev_execute_zone_append(struct nvmet_req *req)
> +{
> +}
> +void nvmet_zns_add_cmd_effects(struct nvme_effects_log *log)
> +{
> +}
> +#endif /* CONFIG_BLK_DEV_ZONED */
>
--
Damien Le Moal
Western Digital Research
