On 11/26/20 00:36, Damien Le Moal wrote:
> On 2020/11/26 11:42, 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 | 18 ++
>> drivers/nvme/target/zns.c | 390 ++++++++++++++++++++++++++++++
>> 5 files changed, 413 insertions(+), 3 deletions(-)
>> create mode 100644 drivers/nvme/target/zns.c
>>
>> diff --git a/drivers/nvme/target/Makefile b/drivers/nvme/target/Makefile
>> index ebf91fc4c72e..bc147ff2df5d 100644
>> --- a/drivers/nvme/target/Makefile
>> +++ b/drivers/nvme/target/Makefile
>> @@ -12,6 +12,8 @@ obj-$(CONFIG_NVME_TARGET_TCP) += nvmet-tcp.o
>> nvmet-y += core.o configfs.o admin-cmd.o fabrics-cmd.o \
>> discovery.o io-cmd-file.o io-cmd-bdev.o
>> nvmet-$(CONFIG_NVME_TARGET_PASSTHRU) += passthru.o
>> +nvmet-$(CONFIG_BLK_DEV_ZONED) += zns.o
>> +
>> nvme-loop-y += loop.o
>> nvmet-rdma-y += rdma.o
>> nvmet-fc-y += fc.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..0542ba672a31 100644
>> --- a/drivers/nvme/target/nvmet.h
>> +++ b/drivers/nvme/target/nvmet.h
>> @@ -81,6 +81,9 @@ 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;
>> +#endif
>> };
>>
>> static inline struct nvmet_ns *to_nvmet_ns(struct config_item *item)
>> @@ -251,6 +254,10 @@ 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 +610,15 @@ 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_config(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..8ea6641a55e3
>> --- /dev/null
>> +++ b/drivers/nvme/target/zns.c
>> @@ -0,0 +1,390 @@
>> +// 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/blkdev.h>
>> +#include <linux/module.h>
>> +#include "nvmet.h"
>> +
>> +#ifdef CONFIG_BLK_DEV_ZONED
> This file is compiled only if CONFIG_BLK_DEV_ZONED is defined, so what is the
> point of this ? The stubs for the !CONFIG_BLK_DEV_ZONED case should go into the
> header file, no ?
Actually the conditional compilation of zns.c with CONFIG_BLK_DEV_ZONED
needs to be removed in the Makefile. I'm against putting these empty
stubs in the
makefile when CONFIG_BLK_DEV_ZONED is not true, as there are several files
transport, discovery, file/passthru backend etc in the nvme/target/*.c
which will add
empty stubs which has nothing to do with zoned bdev backend.
i.e. for Makefile it should be :-
diff --git a/drivers/nvme/target/Makefile b/drivers/nvme/target/Makefile
index ebf91fc4c72e..c67276a25363 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
>> +
>> +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;
> Why not return status directly here ? Same for the other cases below.
I prefer centralize returns with goto, which follows the similar code.
>> + }
>> +
>> + 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 struct block_device *nvmet_bdev(struct nvmet_req *req)
>> +{
>> + return req->ns->bdev;
>> +}
>> +
>> +static u64 nvmet_zones_to_descsize(unsigned int nr_zones)
>> +{
>> + return sizeof(struct nvme_zone_report) +
>> + (sizeof(struct nvme_zone_descriptor) * nr_zones);
>> +}
> These could be declared as inline.
>
Okay.
>> +
>> +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 helprs.
> s/helprs/helpers
Okay.
>
>> + */
>> +
>> +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 nvmet_copy_ns_identifier(req, NVME_NIDT_CSI,
>> + NVME_NIDT_CSI_LEN,
>> + &nvme_cis_zns, off);
>> + }
> No need for the curly brackets.
Okay.
>> +
>> + return NVME_SC_SUCCESS;
>> +}
>> +
>> +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);
>> +}
>> +
>> +bool nvmet_bdev_zns_config(struct nvmet_ns *ns)
>> +{
>> + if (ns->bdev->bd_disk->queue->conv_zones_bitmap) {
>> + pr_err("block device with conventional zones not supported.");
> pr_err("block devices with conventional zones are not supported.");
>
> With SMR drives, the last zone of the disk can be smaller than the other zones.
> That needs to be checked too as that is not allowed by ZNS. Drives with a last
> smaller runt zone cannot be allowed.
Okay.
>> + return false;
>> + }
>> + /*
>> + * SMR drives will results in error if writes are not aligned to the
>> + * physical block size just override.
>> + */
> /*
> * 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.
> */
Okay.
>> + ns->blksize_shift = blksize_bits(bdev_physical_block_size(ns->bdev));
>> + return true;
>> +}
>> +
>> +static int nvmet_bdev_report_zone_cb(struct blk_zone *zone, unsigned int idx,
>> + void *data)
>> +{
>> + struct blk_zone *zones = data;
>> +
>> + memcpy(&zones[idx], zone, sizeof(struct blk_zone));
>> +
>> + return 0;
>> +}
>> +
>> +static void nvmet_get_zone_desc(struct nvmet_ns *ns, struct blk_zone *z,
>> + struct nvme_zone_descriptor *rz)
>> +{
>> + rz->zcap = cpu_to_le64(nvmet_sect_to_lba(ns, z->capacity));
>> + rz->zslba = cpu_to_le64(nvmet_sect_to_lba(ns, z->start));
>> + rz->wp = cpu_to_le64(nvmet_sect_to_lba(ns, z->wp));
>> + rz->za = z->reset ? 1 << 2 : 0;
>> + rz->zt = z->type;
>> + rz->zs = z->cond << 4;
>> +}
>> +
>> +/*
>> + * ZNS related Admin and I/O command handlers.
>> + */
>> +void nvmet_execute_identify_cns_cs_ctrl(struct nvmet_req *req)
>> +{
>> + struct nvme_id_ctrl_zns *id;
>> + u16 status = 0;
>> +
>> + 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).
> But the target drive may have different values for max zone append sectors and
> max_hw_sectors/max_sectors. So I think this needs finer handling.
I think we can getaway with the
min(mdts, min(max_zone_append_sectors/max_hw_sectors), let me see.
>> + */
>> + id->zasl = 0;
>> +
>> + 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;
> That will result in nvmet_copy_to_sgl() being executed. Is that OK ?
> Shouldn't you do only the kfree(id_zns) and complete with an error here ?
Call to nvmet_copy_to_sgl() zeroout the values if any when we return the
buffer in case of error. I don't see any problem with zeroing out buffer in
case of error. Can you please explain why we shouldn't do that ?
>> + }
>> +
>> + 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;
> Same comment.
See above reply.
>> + }
>> +
>> + 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);
>> +}
>> +
>> +void nvmet_bdev_execute_zone_mgmt_recv(struct nvmet_req *req)
>> +{
>> + struct request_queue *q = nvmet_bdev(req)->bd_disk->queue;
>> + struct nvme_zone_mgmt_recv_cmd *zmr = &req->cmd->zmr;
>> + unsigned int nz = blk_queue_nr_zones(q);
>> + u64 bufsize = (zmr->numd << 2) + 1;
>> + struct nvme_zone_report *rz;
>> + struct blk_zone *zones;
>> + int reported_zones;
>> + sector_t sect;
>> + u64 desc_size;
>> + u16 status;
>> + int i;
>> +
>> + desc_size = nvmet_zones_to_descsize(blk_queue_nr_zones(q));
>> + status = nvmet_bdev_zns_checks(req);
>> + if (status)
>> + goto out;
>> +
>> + zones = kvcalloc(blkdev_nr_zones(nvmet_bdev(req)->bd_disk),
>> + sizeof(struct blk_zone), GFP_KERNEL);
> This is not super nice: a large disk will have an enormous number of zones
> (75000+ for largest SMR HDD today). But you actually do not need more zones
> descs than what fits in req buffer.
Call to nvmet_copy_to_sgl() nicely fail and return error.
>> + if (!zones) {
>> + status = NVME_SC_INTERNAL;
>> + goto out;
>> + }
>> +
>> + rz = __vmalloc(bufsize, GFP_KERNEL | __GFP_NORETRY);
>> + if (!rz) {
>> + status = NVME_SC_INTERNAL;
>> + goto out_free_zones;
>> + }
>> +
>> + sect = nvmet_lba_to_sect(req->ns, le64_to_cpu(req->cmd->zmr.slba));
>> +
>> + for (nz = blk_queue_nr_zones(q); desc_size >= bufsize; nz--)
>> + desc_size = nvmet_zones_to_descsize(nz);
>> +
>> + reported_zones = blkdev_report_zones(nvmet_bdev(req), sect, nz,
>> + nvmet_bdev_report_zone_cb,
>> + zones);
>> + if (reported_zones < 0) {
>> + status = NVME_SC_INTERNAL;
>> + goto out_free_report_zones;
>> + }
>> +
>> + rz->nr_zones = cpu_to_le64(reported_zones);
>> + for (i = 0; i < reported_zones; i++)
>> + nvmet_get_zone_desc(req->ns, &zones[i], &rz->entries[i]);
> This can be done directly in the report zones cb. That will avoid looping twice
> over the reported zones.
Okay, I'll try and remove this loop.
>> +
>> + status = nvmet_copy_to_sgl(req, 0, rz, bufsize);
>> +
>> +out_free_report_zones:
>> + kvfree(rz);
>> +out_free_zones:
>> + kvfree(zones);
>> +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;
>> + u16 status = NVME_SC_SUCCESS;
>> + enum req_opf op;
>> + 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;
>> + break;
> You needa goto here or blkdev_zone_mgmt() will be called.
>
True.
>> + }
>> +
>> + ret = blkdev_zone_mgmt(nvmet_bdev(req), op, sect, nr_sect, GFP_KERNEL);
>> + if (ret)
>> + status = NVME_SC_INTERNAL;
>> +
>> + nvmet_req_complete(req, status);
>> +}
>> +
>> +void nvmet_bdev_execute_zone_append(struct nvmet_req *req)
>> +{
>> + unsigned long bv_cnt = min(req->sg_cnt, BIO_MAX_PAGES);
>> + 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;
>> + int sg_cnt = req->sg_cnt;
>> + struct scatterlist *sg;
>> + size_t mapped_data_len;
>> + struct iov_iter from;
>> + struct bio_vec *bvec;
>> + size_t mapped_cnt;
>> + size_t io_len = 0;
>> + struct bio *bio;
>> + int ret;
>> +
>> + if (!nvmet_check_transfer_len(req, nvmet_rw_data_len(req)))
>> + return;
> No request completion ?
See nvmet_check_transfer_len().
>> +
>> + if (!req->sg_cnt) {
>> + nvmet_req_complete(req, 0);
>> + return;
>> + }
>> +
>> + bvec = kmalloc_array(bv_cnt, sizeof(*bvec), GFP_KERNEL);
>> + if (!bvec) {
>> + status = NVME_SC_INTERNAL;
>> + goto out;
>> + }
>> +
>> + while (sg_cnt) {
>> + mapped_data_len = 0;
>> + 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;
>> + }
>> + 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;
>> +
>> + ret = __bio_iov_append_get_pages(bio, &from);
>> + if (unlikely(ret)) {
>> + status = NVME_SC_INTERNAL;
>> + bio_io_error(bio);
>> + kfree(bvec);
>> + goto out;
>> + }
>> +
>> + ret = submit_bio_wait(bio);
>> + bio_put(bio);
>> + if (ret < 0) {
>> + status = NVME_SC_INTERNAL;
>> + break;
>> + }
>> +
>> + io_len += mapped_data_len;
>> + }
> This loop is equivalent to splitting a zone append. That must not be done as
> that can lead to totally unpredictable ordering of the chunks. What if another
> thread is doing zone append to the same zone at the same time ?
>
We can add something like per-zone bit locking here to prevent that,
multiple
threads. With zasl value derived from max_zone_append_sector (as
mentioned in
my reply ideally we shouldn't get the data len more than what we can
handle if I'm
not missing something.
>> +
>> + sect += (io_len >> 9);
>> + req->cqe->result.u64 = le64_to_cpu(nvmet_sect_to_lba(req->ns, sect));
>> + kfree(bvec);
>> +
>> +out:
>> + nvmet_req_complete(req, status);
>> +}
>> +
>> +#else /* CONFIG_BLK_DEV_ZONED */
>> +static void nvmet_execute_identify_cns_cs_ctrl(struct nvmet_req *req)
>> +{
>> +}
>> +static 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;
>> +}
>> +static 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)
>> +{
>> +}
> These should go in the header file. And put the brackets on the same line.
>
As I explained earlier this bloats the header file with empty stubs and
adds functions in the traget transport code from nvmet.h which has
nothing to do with the backend. Regarding the {} style I don't see braces
on the same line for the empty stubs so keeping it consistent what is in
the repo.
>> +#endif /* CONFIG_BLK_DEV_ZONED */
>>
