Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 629 insertions, 0 deletions

diff --git a/drivers/nvme/target/zns.c b/drivers/nvme/target/zns.c
new file mode 100644
index 000000000..d93ee4ae1
--- /dev/null
+++ b/drivers/nvme/target/zns.c
@@ -0,0 +1,629 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * NVMe ZNS-ZBD command implementation.
+ * Copyright (C) 2021 Western Digital Corporation or its affiliates.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/nvme.h>
+#include <linux/blkdev.h>
+#include "nvmet.h"
+
+/*
+ * We set the Memory Page Size Minimum (MPSMIN) for target controller to 0
+ * which gets added by 12 in the nvme_enable_ctrl() which results in 2^12 = 4k
+ * as page_shift value. When calculating the ZASL use shift by 12.
+ */
+#define NVMET_MPSMIN_SHIFT	12
+
+static inline u8 nvmet_zasl(unsigned int zone_append_sects)
+{
+	/*
+	 * Zone Append Size Limit (zasl) is expressed as a power of 2 value
+	 * with the minimum memory page size (i.e. 12) as unit.
+	 */
+	return ilog2(zone_append_sects >> (NVMET_MPSMIN_SHIFT - 9));
+}
+
+static int validate_conv_zones_cb(struct blk_zone *z,
+				  unsigned int i, void *data)
+{
+	if (z->type == BLK_ZONE_TYPE_CONVENTIONAL)
+		return -EOPNOTSUPP;
+	return 0;
+}
+
+bool nvmet_bdev_zns_enable(struct nvmet_ns *ns)
+{
+	u8 zasl = nvmet_zasl(bdev_max_zone_append_sectors(ns->bdev));
+	struct gendisk *bd_disk = ns->bdev->bd_disk;
+	int ret;
+
+	if (ns->subsys->zasl) {
+		if (ns->subsys->zasl > zasl)
+			return false;
+	}
+	ns->subsys->zasl = zasl;
+
+	/*
+	 * Generic zoned block devices may have a smaller last zone which is
+	 * not supported by ZNS. Exclude zoned drives that have such smaller
+	 * last zone.
+	 */
+	if (get_capacity(bd_disk) & (bdev_zone_sectors(ns->bdev) - 1))
+		return false;
+	/*
+	 * ZNS does not define a conventional zone type. If the underlying
+	 * device has a bitmap set indicating the existence of conventional
+	 * zones, reject the device. Otherwise, use report zones to detect if
+	 * the device has conventional zones.
+	 */
+	if (ns->bdev->bd_disk->conv_zones_bitmap)
+		return false;
+
+	ret = blkdev_report_zones(ns->bdev, 0, bdev_nr_zones(ns->bdev),
+				  validate_conv_zones_cb, NULL);
+	if (ret < 0)
+		return false;
+
+	ns->blksize_shift = blksize_bits(bdev_logical_block_size(ns->bdev));
+
+	return true;
+}
+
+void nvmet_execute_identify_ctrl_zns(struct nvmet_req *req)
+{
+	u8 zasl = req->sq->ctrl->subsys->zasl;
+	struct nvmet_ctrl *ctrl = req->sq->ctrl;
+	struct nvme_id_ctrl_zns *id;
+	u16 status;
+
+	id = kzalloc(sizeof(*id), GFP_KERNEL);
+	if (!id) {
+		status = NVME_SC_INTERNAL;
+		goto out;
+	}
+
+	if (ctrl->ops->get_mdts)
+		id->zasl = min_t(u8, ctrl->ops->get_mdts(ctrl), zasl);
+	else
+		id->zasl = 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 = NULL;
+	u64 zsze;
+	u16 status;
+	u32 mar, mor;
+
+	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;
+	}
+
+	status = nvmet_req_find_ns(req);
+	if (status)
+		goto done;
+
+	if (nvmet_ns_revalidate(req->ns)) {
+		mutex_lock(&req->ns->subsys->lock);
+		nvmet_ns_changed(req->ns->subsys, req->ns->nsid);
+		mutex_unlock(&req->ns->subsys->lock);
+	}
+
+	if (!bdev_is_zoned(req->ns->bdev)) {
+		status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
+		req->error_loc = offsetof(struct nvme_identify, nsid);
+		goto out;
+	}
+
+	zsze = (bdev_zone_sectors(req->ns->bdev) << 9) >>
+					req->ns->blksize_shift;
+	id_zns->lbafe[0].zsze = cpu_to_le64(zsze);
+
+	mor = bdev_max_open_zones(req->ns->bdev);
+	if (!mor)
+		mor = U32_MAX;
+	else
+		mor--;
+	id_zns->mor = cpu_to_le32(mor);
+
+	mar = bdev_max_active_zones(req->ns->bdev);
+	if (!mar)
+		mar = U32_MAX;
+	else
+		mar--;
+	id_zns->mar = cpu_to_le32(mar);
+
+done:
+	status = nvmet_copy_to_sgl(req, 0, id_zns, sizeof(*id_zns));
+out:
+	kfree(id_zns);
+	nvmet_req_complete(req, status);
+}
+
+static u16 nvmet_bdev_validate_zone_mgmt_recv(struct nvmet_req *req)
+{
+	sector_t sect = nvmet_lba_to_sect(req->ns, req->cmd->zmr.slba);
+	u32 out_bufsize = (le32_to_cpu(req->cmd->zmr.numd) + 1) << 2;
+
+	if (sect >= get_capacity(req->ns->bdev->bd_disk)) {
+		req->error_loc = offsetof(struct nvme_zone_mgmt_recv_cmd, slba);
+		return NVME_SC_LBA_RANGE | NVME_SC_DNR;
+	}
+
+	if (out_bufsize < sizeof(struct nvme_zone_report)) {
+		req->error_loc = offsetof(struct nvme_zone_mgmt_recv_cmd, numd);
+		return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
+	}
+
+	if (req->cmd->zmr.zra != NVME_ZRA_ZONE_REPORT) {
+		req->error_loc = offsetof(struct nvme_zone_mgmt_recv_cmd, zra);
+		return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
+	}
+
+	switch (req->cmd->zmr.pr) {
+	case 0:
+	case 1:
+		break;
+	default:
+		req->error_loc = offsetof(struct nvme_zone_mgmt_recv_cmd, pr);
+		return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
+	}
+
+	switch (req->cmd->zmr.zrasf) {
+	case NVME_ZRASF_ZONE_REPORT_ALL:
+	case NVME_ZRASF_ZONE_STATE_EMPTY:
+	case NVME_ZRASF_ZONE_STATE_IMP_OPEN:
+	case NVME_ZRASF_ZONE_STATE_EXP_OPEN:
+	case NVME_ZRASF_ZONE_STATE_CLOSED:
+	case NVME_ZRASF_ZONE_STATE_FULL:
+	case NVME_ZRASF_ZONE_STATE_READONLY:
+	case NVME_ZRASF_ZONE_STATE_OFFLINE:
+		break;
+	default:
+		req->error_loc =
+			offsetof(struct nvme_zone_mgmt_recv_cmd, zrasf);
+		return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
+	}
+
+	return NVME_SC_SUCCESS;
+}
+
+struct nvmet_report_zone_data {
+	struct nvmet_req *req;
+	u64 out_buf_offset;
+	u64 out_nr_zones;
+	u64 nr_zones;
+	u8 zrasf;
+};
+
+static int nvmet_bdev_report_zone_cb(struct blk_zone *z, unsigned i, void *d)
+{
+	static const unsigned int nvme_zrasf_to_blk_zcond[] = {
+		[NVME_ZRASF_ZONE_STATE_EMPTY]	 = BLK_ZONE_COND_EMPTY,
+		[NVME_ZRASF_ZONE_STATE_IMP_OPEN] = BLK_ZONE_COND_IMP_OPEN,
+		[NVME_ZRASF_ZONE_STATE_EXP_OPEN] = BLK_ZONE_COND_EXP_OPEN,
+		[NVME_ZRASF_ZONE_STATE_CLOSED]	 = BLK_ZONE_COND_CLOSED,
+		[NVME_ZRASF_ZONE_STATE_READONLY] = BLK_ZONE_COND_READONLY,
+		[NVME_ZRASF_ZONE_STATE_FULL]	 = BLK_ZONE_COND_FULL,
+		[NVME_ZRASF_ZONE_STATE_OFFLINE]	 = BLK_ZONE_COND_OFFLINE,
+	};
+	struct nvmet_report_zone_data *rz = d;
+
+	if (rz->zrasf != NVME_ZRASF_ZONE_REPORT_ALL &&
+	    z->cond != nvme_zrasf_to_blk_zcond[rz->zrasf])
+		return 0;
+
+	if (rz->nr_zones < rz->out_nr_zones) {
+		struct nvme_zone_descriptor zdesc = { };
+		u16 status;
+
+		zdesc.zcap = nvmet_sect_to_lba(rz->req->ns, z->capacity);
+		zdesc.zslba = nvmet_sect_to_lba(rz->req->ns, z->start);
+		zdesc.wp = nvmet_sect_to_lba(rz->req->ns, z->wp);
+		zdesc.za = z->reset ? 1 << 2 : 0;
+		zdesc.zs = z->cond << 4;
+		zdesc.zt = z->type;
+
+		status = nvmet_copy_to_sgl(rz->req, rz->out_buf_offset, &zdesc,
+					   sizeof(zdesc));
+		if (status)
+			return -EINVAL;
+
+		rz->out_buf_offset += sizeof(zdesc);
+	}
+
+	rz->nr_zones++;
+
+	return 0;
+}
+
+static unsigned long nvmet_req_nr_zones_from_slba(struct nvmet_req *req)
+{
+	unsigned int sect = nvmet_lba_to_sect(req->ns, req->cmd->zmr.slba);
+
+	return bdev_nr_zones(req->ns->bdev) -
+		(sect >> ilog2(bdev_zone_sectors(req->ns->bdev)));
+}
+
+static unsigned long get_nr_zones_from_buf(struct nvmet_req *req, u32 bufsize)
+{
+	if (bufsize <= sizeof(struct nvme_zone_report))
+		return 0;
+
+	return (bufsize - sizeof(struct nvme_zone_report)) /
+		sizeof(struct nvme_zone_descriptor);
+}
+
+static void nvmet_bdev_zone_zmgmt_recv_work(struct work_struct *w)
+{
+	struct nvmet_req *req = container_of(w, struct nvmet_req, z.zmgmt_work);
+	sector_t start_sect = nvmet_lba_to_sect(req->ns, req->cmd->zmr.slba);
+	unsigned long req_slba_nr_zones = nvmet_req_nr_zones_from_slba(req);
+	u32 out_bufsize = (le32_to_cpu(req->cmd->zmr.numd) + 1) << 2;
+	__le64 nr_zones;
+	u16 status;
+	int ret;
+	struct nvmet_report_zone_data rz_data = {
+		.out_nr_zones = get_nr_zones_from_buf(req, out_bufsize),
+		/* leave the place for report zone header */
+		.out_buf_offset = sizeof(struct nvme_zone_report),
+		.zrasf = req->cmd->zmr.zrasf,
+		.nr_zones = 0,
+		.req = req,
+	};
+
+	status = nvmet_bdev_validate_zone_mgmt_recv(req);
+	if (status)
+		goto out;
+
+	if (!req_slba_nr_zones) {
+		status = NVME_SC_SUCCESS;
+		goto out;
+	}
+
+	ret = blkdev_report_zones(req->ns->bdev, start_sect, req_slba_nr_zones,
+				 nvmet_bdev_report_zone_cb, &rz_data);
+	if (ret < 0) {
+		status = NVME_SC_INTERNAL;
+		goto out;
+	}
+
+	/*
+	 * When partial bit is set nr_zones must indicate the number of zone
+	 * descriptors actually transferred.
+	 */
+	if (req->cmd->zmr.pr)
+		rz_data.nr_zones = min(rz_data.nr_zones, rz_data.out_nr_zones);
+
+	nr_zones = cpu_to_le64(rz_data.nr_zones);
+	status = nvmet_copy_to_sgl(req, 0, &nr_zones, sizeof(nr_zones));
+
+out:
+	nvmet_req_complete(req, status);
+}
+
+void nvmet_bdev_execute_zone_mgmt_recv(struct nvmet_req *req)
+{
+	INIT_WORK(&req->z.zmgmt_work, nvmet_bdev_zone_zmgmt_recv_work);
+	queue_work(zbd_wq, &req->z.zmgmt_work);
+}
+
+static inline enum req_op zsa_req_op(u8 zsa)
+{
+	switch (zsa) {
+	case NVME_ZONE_OPEN:
+		return REQ_OP_ZONE_OPEN;
+	case NVME_ZONE_CLOSE:
+		return REQ_OP_ZONE_CLOSE;
+	case NVME_ZONE_FINISH:
+		return REQ_OP_ZONE_FINISH;
+	case NVME_ZONE_RESET:
+		return REQ_OP_ZONE_RESET;
+	default:
+		return REQ_OP_LAST;
+	}
+}
+
+static u16 blkdev_zone_mgmt_errno_to_nvme_status(int ret)
+{
+	switch (ret) {
+	case 0:
+		return NVME_SC_SUCCESS;
+	case -EINVAL:
+	case -EIO:
+		return NVME_SC_ZONE_INVALID_TRANSITION | NVME_SC_DNR;
+	default:
+		return NVME_SC_INTERNAL;
+	}
+}
+
+struct nvmet_zone_mgmt_send_all_data {
+	unsigned long *zbitmap;
+	struct nvmet_req *req;
+};
+
+static int zmgmt_send_scan_cb(struct blk_zone *z, unsigned i, void *d)
+{
+	struct nvmet_zone_mgmt_send_all_data *data = d;
+
+	switch (zsa_req_op(data->req->cmd->zms.zsa)) {
+	case REQ_OP_ZONE_OPEN:
+		switch (z->cond) {
+		case BLK_ZONE_COND_CLOSED:
+			break;
+		default:
+			return 0;
+		}
+		break;
+	case REQ_OP_ZONE_CLOSE:
+		switch (z->cond) {
+		case BLK_ZONE_COND_IMP_OPEN:
+		case BLK_ZONE_COND_EXP_OPEN:
+			break;
+		default:
+			return 0;
+		}
+		break;
+	case REQ_OP_ZONE_FINISH:
+		switch (z->cond) {
+		case BLK_ZONE_COND_IMP_OPEN:
+		case BLK_ZONE_COND_EXP_OPEN:
+		case BLK_ZONE_COND_CLOSED:
+			break;
+		default:
+			return 0;
+		}
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	set_bit(i, data->zbitmap);
+
+	return 0;
+}
+
+static u16 nvmet_bdev_zone_mgmt_emulate_all(struct nvmet_req *req)
+{
+	struct block_device *bdev = req->ns->bdev;
+	unsigned int nr_zones = bdev_nr_zones(bdev);
+	struct bio *bio = NULL;
+	sector_t sector = 0;
+	int ret;
+	struct nvmet_zone_mgmt_send_all_data d = {
+		.req = req,
+	};
+
+	d.zbitmap = kcalloc_node(BITS_TO_LONGS(nr_zones), sizeof(*(d.zbitmap)),
+				 GFP_NOIO, bdev->bd_disk->node_id);
+	if (!d.zbitmap) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	/* Scan and build bitmap of the eligible zones */
+	ret = blkdev_report_zones(bdev, 0, nr_zones, zmgmt_send_scan_cb, &d);
+	if (ret != nr_zones) {
+		if (ret > 0)
+			ret = -EIO;
+		goto out;
+	} else {
+		/* We scanned all the zones */
+		ret = 0;
+	}
+
+	while (sector < bdev_nr_sectors(bdev)) {
+		if (test_bit(disk_zone_no(bdev->bd_disk, sector), d.zbitmap)) {
+			bio = blk_next_bio(bio, bdev, 0,
+				zsa_req_op(req->cmd->zms.zsa) | REQ_SYNC,
+				GFP_KERNEL);
+			bio->bi_iter.bi_sector = sector;
+			/* This may take a while, so be nice to others */
+			cond_resched();
+		}
+		sector += bdev_zone_sectors(bdev);
+	}
+
+	if (bio) {
+		ret = submit_bio_wait(bio);
+		bio_put(bio);
+	}
+
+out:
+	kfree(d.zbitmap);
+
+	return blkdev_zone_mgmt_errno_to_nvme_status(ret);
+}
+
+static u16 nvmet_bdev_execute_zmgmt_send_all(struct nvmet_req *req)
+{
+	int ret;
+
+	switch (zsa_req_op(req->cmd->zms.zsa)) {
+	case REQ_OP_ZONE_RESET:
+		ret = blkdev_zone_mgmt(req->ns->bdev, REQ_OP_ZONE_RESET, 0,
+				       get_capacity(req->ns->bdev->bd_disk),
+				       GFP_KERNEL);
+		if (ret < 0)
+			return blkdev_zone_mgmt_errno_to_nvme_status(ret);
+		break;
+	case REQ_OP_ZONE_OPEN:
+	case REQ_OP_ZONE_CLOSE:
+	case REQ_OP_ZONE_FINISH:
+		return nvmet_bdev_zone_mgmt_emulate_all(req);
+	default:
+		/* this is needed to quiet compiler warning */
+		req->error_loc = offsetof(struct nvme_zone_mgmt_send_cmd, zsa);
+		return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
+	}
+
+	return NVME_SC_SUCCESS;
+}
+
+static void nvmet_bdev_zmgmt_send_work(struct work_struct *w)
+{
+	struct nvmet_req *req = container_of(w, struct nvmet_req, z.zmgmt_work);
+	sector_t sect = nvmet_lba_to_sect(req->ns, req->cmd->zms.slba);
+	enum req_op op = zsa_req_op(req->cmd->zms.zsa);
+	struct block_device *bdev = req->ns->bdev;
+	sector_t zone_sectors = bdev_zone_sectors(bdev);
+	u16 status = NVME_SC_SUCCESS;
+	int ret;
+
+	if (op == REQ_OP_LAST) {
+		req->error_loc = offsetof(struct nvme_zone_mgmt_send_cmd, zsa);
+		status = NVME_SC_ZONE_INVALID_TRANSITION | NVME_SC_DNR;
+		goto out;
+	}
+
+	/* when select all bit is set slba field is ignored */
+	if (req->cmd->zms.select_all) {
+		status = nvmet_bdev_execute_zmgmt_send_all(req);
+		goto out;
+	}
+
+	if (sect >= get_capacity(bdev->bd_disk)) {
+		req->error_loc = offsetof(struct nvme_zone_mgmt_send_cmd, slba);
+		status = NVME_SC_LBA_RANGE | NVME_SC_DNR;
+		goto out;
+	}
+
+	if (sect & (zone_sectors - 1)) {
+		req->error_loc = offsetof(struct nvme_zone_mgmt_send_cmd, slba);
+		status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
+		goto out;
+	}
+
+	ret = blkdev_zone_mgmt(bdev, op, sect, zone_sectors, GFP_KERNEL);
+	if (ret < 0)
+		status = blkdev_zone_mgmt_errno_to_nvme_status(ret);
+
+out:
+	nvmet_req_complete(req, status);
+}
+
+void nvmet_bdev_execute_zone_mgmt_send(struct nvmet_req *req)
+{
+	INIT_WORK(&req->z.zmgmt_work, nvmet_bdev_zmgmt_send_work);
+	queue_work(zbd_wq, &req->z.zmgmt_work);
+}
+
+static void nvmet_bdev_zone_append_bio_done(struct bio *bio)
+{
+	struct nvmet_req *req = bio->bi_private;
+
+	if (bio->bi_status == BLK_STS_OK) {
+		req->cqe->result.u64 =
+			nvmet_sect_to_lba(req->ns, bio->bi_iter.bi_sector);
+	}
+
+	nvmet_req_complete(req, blk_to_nvme_status(req, bio->bi_status));
+	nvmet_req_bio_put(req, bio);
+}
+
+void nvmet_bdev_execute_zone_append(struct nvmet_req *req)
+{
+	sector_t sect = nvmet_lba_to_sect(req->ns, req->cmd->rw.slba);
+	const blk_opf_t opf = REQ_OP_ZONE_APPEND | REQ_SYNC | REQ_IDLE;
+	u16 status = NVME_SC_SUCCESS;
+	unsigned int total_len = 0;
+	struct scatterlist *sg;
+	struct bio *bio;
+	int sg_cnt;
+
+	/* Request is completed on len mismatch in nvmet_check_transter_len() */
+	if (!nvmet_check_transfer_len(req, nvmet_rw_data_len(req)))
+		return;
+
+	if (!req->sg_cnt) {
+		nvmet_req_complete(req, 0);
+		return;
+	}
+
+	if (sect >= get_capacity(req->ns->bdev->bd_disk)) {
+		req->error_loc = offsetof(struct nvme_rw_command, slba);
+		status = NVME_SC_LBA_RANGE | NVME_SC_DNR;
+		goto out;
+	}
+
+	if (sect & (bdev_zone_sectors(req->ns->bdev) - 1)) {
+		req->error_loc = offsetof(struct nvme_rw_command, slba);
+		status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
+		goto out;
+	}
+
+	if (nvmet_use_inline_bvec(req)) {
+		bio = &req->z.inline_bio;
+		bio_init(bio, req->ns->bdev, req->inline_bvec,
+			 ARRAY_SIZE(req->inline_bvec), opf);
+	} else {
+		bio = bio_alloc(req->ns->bdev, req->sg_cnt, opf, GFP_KERNEL);
+	}
+
+	bio->bi_end_io = nvmet_bdev_zone_append_bio_done;
+	bio->bi_iter.bi_sector = sect;
+	bio->bi_private = req;
+	if (req->cmd->rw.control & cpu_to_le16(NVME_RW_FUA))
+		bio->bi_opf |= REQ_FUA;
+
+	for_each_sg(req->sg, sg, req->sg_cnt, sg_cnt) {
+		struct page *p = sg_page(sg);
+		unsigned int l = sg->length;
+		unsigned int o = sg->offset;
+		unsigned int ret;
+
+		ret = bio_add_zone_append_page(bio, p, l, o);
+		if (ret != sg->length) {
+			status = NVME_SC_INTERNAL;
+			goto out_put_bio;
+		}
+		total_len += sg->length;
+	}
+
+	if (total_len != nvmet_rw_data_len(req)) {
+		status = NVME_SC_INTERNAL | NVME_SC_DNR;
+		goto out_put_bio;
+	}
+
+	submit_bio(bio);
+	return;
+
+out_put_bio:
+	nvmet_req_bio_put(req, bio);
+out:
+	nvmet_req_complete(req, status);
+}
+
+u16 nvmet_bdev_zns_parse_io_cmd(struct nvmet_req *req)
+{
+	struct nvme_command *cmd = req->cmd;
+
+	switch (cmd->common.opcode) {
+	case nvme_cmd_zone_append:
+		req->execute = nvmet_bdev_execute_zone_append;
+		return 0;
+	case nvme_cmd_zone_mgmt_recv:
+		req->execute = nvmet_bdev_execute_zone_mgmt_recv;
+		return 0;
+	case nvme_cmd_zone_mgmt_send:
+		req->execute = nvmet_bdev_execute_zone_mgmt_send;
+		return 0;
+	default:
+		return nvmet_bdev_parse_io_cmd(req);
+	}
+}