Adding upstream version 18.2.2.upstream/18.2.2

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

1 files changed, 2067 insertions, 0 deletions

diff --git a/src/spdk/lib/scsi/scsi_bdev.c b/src/spdk/lib/scsi/scsi_bdev.c
new file mode 100644
index 000000000..bf0fb5af7
--- /dev/null
+++ b/src/spdk/lib/scsi/scsi_bdev.c
@@ -0,0 +1,2067 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright (C) 2008-2012 Daisuke Aoyama <aoyama@peach.ne.jp>.
+ *   Copyright (c) Intel Corporation.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "scsi_internal.h"
+
+/*
+ * TODO: move bdev SCSI error code translation tests to bdev unit test
+ * and remove this include.
+ */
+#include "spdk/bdev_module.h"
+
+#include "spdk/env.h"
+#include "spdk/bdev.h"
+#include "spdk/endian.h"
+#include "spdk/likely.h"
+#include "spdk/string.h"
+#include "spdk/util.h"
+
+#define SPDK_WORK_BLOCK_SIZE		(4ULL * 1024ULL * 1024ULL)
+#define SPDK_WORK_ATS_BLOCK_SIZE	(1ULL * 1024ULL * 1024ULL)
+#define MAX_SERIAL_STRING		32
+
+#define DEFAULT_DISK_VENDOR		"INTEL"
+#define DEFAULT_DISK_REVISION		"0001"
+#define DEFAULT_DISK_ROTATION_RATE	1	/* Non-rotating medium */
+#define DEFAULT_DISK_FORM_FACTOR	0x02	/* 3.5 inch */
+#define DEFAULT_MAX_UNMAP_BLOCK_DESCRIPTOR_COUNT	256
+
+#define INQUIRY_OFFSET(field)		offsetof(struct spdk_scsi_cdb_inquiry_data, field) + \
+					sizeof(((struct spdk_scsi_cdb_inquiry_data *)0x0)->field)
+
+static void bdev_scsi_process_block_resubmit(void *arg);
+
+static int
+hex2bin(char ch)
+{
+	if ((ch >= '0') && (ch <= '9')) {
+		return ch - '0';
+	}
+	ch = tolower(ch);
+	if ((ch >= 'a') && (ch <= 'f')) {
+		return ch - 'a' + 10;
+	}
+	return (int)ch;
+}
+
+static void
+bdev_scsi_set_naa_ieee_extended(const char *name, uint8_t *buf)
+{
+	int i, value, count = 0;
+	uint64_t local_value;
+
+	for (i = 0; (i < 16) && (name[i] != '\0'); i++) {
+		value = hex2bin(name[i]);
+		if (i % 2) {
+			buf[count++] |= value << 4;
+		} else {
+			buf[count] = value;
+		}
+	}
+
+	local_value = *(uint64_t *)buf;
+	/*
+	 * see spc3r23 7.6.3.6.2,
+	 *  NAA IEEE Extended identifer format
+	 */
+	local_value &= 0x0fff000000ffffffull;
+	/* NAA 02, and 00 03 47 for IEEE Intel */
+	local_value |= 0x2000000347000000ull;
+
+	to_be64((void *)buf, local_value);
+}
+
+static int
+bdev_scsi_report_luns(struct spdk_scsi_lun *lun,
+		      int sel, uint8_t *data, int alloc_len)
+{
+	struct spdk_scsi_dev *dev;
+	uint64_t fmt_lun;
+	int hlen, len = 0;
+	int i;
+
+	if (alloc_len < 8) {
+		return -1;
+	}
+
+	if (sel == 0x00) {
+		/* logical unit with addressing method */
+	} else if (sel == 0x01) {
+		/* well known logical unit */
+	} else if (sel == 0x02) {
+		/* logical unit */
+	} else {
+		return -1;
+	}
+
+	/* LUN LIST LENGTH */
+	memset(data, 0, 4);
+
+	/* Reserved */
+	memset(&data[4], 0, 4);
+	hlen = 8;
+
+	dev = lun->dev;
+
+	for (i = 0; i < SPDK_SCSI_DEV_MAX_LUN; i++) {
+		if (dev->lun[i] == NULL) {
+			continue;
+		}
+
+		if (alloc_len - (hlen + len) < 8) {
+			return -1;
+		}
+
+		fmt_lun = spdk_scsi_lun_id_int_to_fmt(i);
+
+		/* LUN */
+		to_be64(&data[hlen + len], fmt_lun);
+		len += 8;
+	}
+
+	/* LUN LIST LENGTH */
+	to_be32(data, len);
+
+	return hlen + len;
+}
+
+static int
+bdev_scsi_pad_scsi_name(char *dst, const char *name)
+{
+	size_t len;
+
+	len = strlen(name);
+	memcpy(dst, name, len);
+	do {
+		dst[len++] = '\0';
+	} while (len & 3);
+
+	return len;
+}
+
+static int
+bdev_scsi_inquiry(struct spdk_bdev *bdev, struct spdk_scsi_task *task,
+		  uint8_t *cdb, uint8_t *data, uint16_t alloc_len)
+{
+	struct spdk_scsi_lun	*lun;
+	struct spdk_scsi_dev	*dev;
+	struct spdk_scsi_port	*port;
+	uint32_t blocks, optimal_blocks;
+	int hlen = 0, plen, plen2;
+	uint16_t len = 0;
+	int pc;
+	int pd;
+	int evpd;
+	int i;
+	struct spdk_scsi_cdb_inquiry *inq = (struct spdk_scsi_cdb_inquiry *)cdb;
+
+	/* standard inquiry command at lease with 36 Bytes */
+	if (alloc_len < 0x24) {
+		goto inq_error;
+	}
+
+	lun = task->lun;
+	dev = lun->dev;
+	port = task->target_port;
+
+	pd = SPDK_SPC_PERIPHERAL_DEVICE_TYPE_DISK;
+	pc = inq->page_code;
+	evpd = inq->evpd & 0x1;
+
+	if (!evpd && pc) {
+		spdk_scsi_task_set_status(task, SPDK_SCSI_STATUS_CHECK_CONDITION,
+					  SPDK_SCSI_SENSE_ILLEGAL_REQUEST,
+					  SPDK_SCSI_ASC_INVALID_FIELD_IN_CDB,
+					  SPDK_SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
+		return -1;
+	}
+
+	if (evpd) {
+		struct spdk_scsi_vpd_page *vpage = (struct spdk_scsi_vpd_page *)data;
+
+		/* PERIPHERAL QUALIFIER(7-5) PERIPHERAL DEVICE TYPE(4-0) */
+		vpage->peripheral_device_type = pd;
+		vpage->peripheral_qualifier = SPDK_SPC_PERIPHERAL_QUALIFIER_CONNECTED;
+		/* PAGE CODE */
+		vpage->page_code = pc;
+
+		/* Vital product data */
+		switch (pc) {
+		case SPDK_SPC_VPD_SUPPORTED_VPD_PAGES:
+			hlen = 4;
+
+			vpage->params[0] = SPDK_SPC_VPD_SUPPORTED_VPD_PAGES;
+			vpage->params[1] = SPDK_SPC_VPD_UNIT_SERIAL_NUMBER;
+			vpage->params[2] = SPDK_SPC_VPD_DEVICE_IDENTIFICATION;
+			vpage->params[3] = SPDK_SPC_VPD_MANAGEMENT_NETWORK_ADDRESSES;
+			vpage->params[4] = SPDK_SPC_VPD_EXTENDED_INQUIRY_DATA;
+			vpage->params[5] = SPDK_SPC_VPD_MODE_PAGE_POLICY;
+			vpage->params[6] = SPDK_SPC_VPD_SCSI_PORTS;
+			vpage->params[7] = SPDK_SPC_VPD_BLOCK_LIMITS;
+			vpage->params[8] = SPDK_SPC_VPD_BLOCK_DEV_CHARS;
+			len = 9;
+			if (spdk_bdev_io_type_supported(bdev, SPDK_BDEV_IO_TYPE_UNMAP)) {
+				vpage->params[9] = SPDK_SPC_VPD_BLOCK_THIN_PROVISION;
+				len++;
+			}
+
+			/* PAGE LENGTH */
+			to_be16(vpage->alloc_len, len);
+			break;
+
+		case SPDK_SPC_VPD_UNIT_SERIAL_NUMBER: {
+			const char *name = spdk_bdev_get_name(bdev);
+
+			hlen = 4;
+
+			/* PRODUCT SERIAL NUMBER */
+			len = strlen(name) + 1;
+			if (len > MAX_SERIAL_STRING) {
+				len = MAX_SERIAL_STRING;
+			}
+
+			memcpy(vpage->params, name, len - 1);
+			vpage->params[len - 1] = 0;
+
+			/* PAGE LENGTH */
+			to_be16(vpage->alloc_len, len);
+			break;
+		}
+
+		case SPDK_SPC_VPD_DEVICE_IDENTIFICATION: {
+			const char *name = spdk_bdev_get_name(bdev);
+			const char *product_name = spdk_bdev_get_product_name(bdev);
+			uint8_t protocol_id = dev->protocol_id;
+			uint8_t *buf = vpage->params;
+			struct spdk_scsi_desig_desc *desig;
+
+			hlen = 4;
+
+			/* Check total length by calculated how much space all entries take */
+			len = sizeof(struct spdk_scsi_desig_desc) + 8;
+			len += sizeof(struct spdk_scsi_desig_desc) + 8 + 16 + MAX_SERIAL_STRING;
+			len += sizeof(struct spdk_scsi_desig_desc) + SPDK_SCSI_DEV_MAX_NAME + 1;
+			len += sizeof(struct spdk_scsi_desig_desc) + SPDK_SCSI_PORT_MAX_NAME_LENGTH;
+			len += sizeof(struct spdk_scsi_desig_desc) + 4;
+			len += sizeof(struct spdk_scsi_desig_desc) + 4;
+			len += sizeof(struct spdk_scsi_desig_desc) + 4;
+			if (sizeof(struct spdk_scsi_vpd_page) + len > alloc_len) {
+				spdk_scsi_task_set_status(task, SPDK_SCSI_STATUS_CHECK_CONDITION,
+							  SPDK_SCSI_SENSE_ILLEGAL_REQUEST,
+							  SPDK_SCSI_ASC_INVALID_FIELD_IN_CDB,
+							  SPDK_SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
+				return -1;
+			}
+
+			/* Now fill out the designator array */
+
+			/* NAA designator */
+			desig = (struct spdk_scsi_desig_desc *)buf;
+			desig->code_set = SPDK_SPC_VPD_CODE_SET_BINARY;
+			desig->protocol_id = protocol_id;
+			desig->type = SPDK_SPC_VPD_IDENTIFIER_TYPE_NAA;
+			desig->association = SPDK_SPC_VPD_ASSOCIATION_LOGICAL_UNIT;
+			desig->reserved0 = 0;
+			desig->piv = 1;
+			desig->reserved1 = 0;
+			desig->len = 8;
+			bdev_scsi_set_naa_ieee_extended(name, desig->desig);
+			len = sizeof(struct spdk_scsi_desig_desc) + 8;
+
+			buf += sizeof(struct spdk_scsi_desig_desc) + desig->len;
+
+			/* T10 Vendor ID designator */
+			desig = (struct spdk_scsi_desig_desc *)buf;
+			desig->code_set = SPDK_SPC_VPD_CODE_SET_ASCII;
+			desig->protocol_id = protocol_id;
+			desig->type = SPDK_SPC_VPD_IDENTIFIER_TYPE_T10_VENDOR_ID;
+			desig->association = SPDK_SPC_VPD_ASSOCIATION_LOGICAL_UNIT;
+			desig->reserved0 = 0;
+			desig->piv = 1;
+			desig->reserved1 = 0;
+			desig->len = 8 + 16 + MAX_SERIAL_STRING;
+			spdk_strcpy_pad(desig->desig, DEFAULT_DISK_VENDOR, 8, ' ');
+			spdk_strcpy_pad(&desig->desig[8], product_name, 16, ' ');
+			spdk_strcpy_pad(&desig->desig[24], name, MAX_SERIAL_STRING, ' ');
+			len += sizeof(struct spdk_scsi_desig_desc) + 8 + 16 + MAX_SERIAL_STRING;
+
+			buf += sizeof(struct spdk_scsi_desig_desc) + desig->len;
+
+			/* SCSI Device Name designator */
+			desig = (struct spdk_scsi_desig_desc *)buf;
+			desig->code_set = SPDK_SPC_VPD_CODE_SET_UTF8;
+			desig->protocol_id = protocol_id;
+			desig->type = SPDK_SPC_VPD_IDENTIFIER_TYPE_SCSI_NAME;
+			desig->association = SPDK_SPC_VPD_ASSOCIATION_TARGET_DEVICE;
+			desig->reserved0 = 0;
+			desig->piv = 1;
+			desig->reserved1 = 0;
+			desig->len = bdev_scsi_pad_scsi_name(desig->desig, dev->name);
+			len += sizeof(struct spdk_scsi_desig_desc) + desig->len;
+
+			buf += sizeof(struct spdk_scsi_desig_desc) + desig->len;
+
+			/* SCSI Port Name designator */
+			desig = (struct spdk_scsi_desig_desc *)buf;
+			desig->code_set = SPDK_SPC_VPD_CODE_SET_UTF8;
+			desig->protocol_id = protocol_id;
+			desig->type = SPDK_SPC_VPD_IDENTIFIER_TYPE_SCSI_NAME;
+			desig->association = SPDK_SPC_VPD_ASSOCIATION_TARGET_PORT;
+			desig->reserved0 = 0;
+			desig->piv = 1;
+			desig->reserved1 = 0;
+			desig->len = snprintf(desig->desig, SPDK_SCSI_PORT_MAX_NAME_LENGTH, "%s", port->name);
+			len += sizeof(struct spdk_scsi_desig_desc) + desig->len;
+
+			buf += sizeof(struct spdk_scsi_desig_desc) + desig->len;
+
+			/* Relative Target Port designator */
+			desig = (struct spdk_scsi_desig_desc *)buf;
+			desig->code_set = SPDK_SPC_VPD_CODE_SET_BINARY;
+			desig->protocol_id = protocol_id;
+			desig->type = SPDK_SPC_VPD_IDENTIFIER_TYPE_RELATIVE_TARGET_PORT;
+			desig->association = SPDK_SPC_VPD_ASSOCIATION_TARGET_PORT;
+			desig->reserved0 = 0;
+			desig->piv = 1;
+			desig->reserved1 = 0;
+			desig->len = 4;
+			memset(desig->desig, 0, 2); /* Reserved */
+			to_be16(&desig->desig[2], port->index);
+			len += sizeof(struct spdk_scsi_desig_desc) + desig->len;
+
+			buf += sizeof(struct spdk_scsi_desig_desc) + desig->len;
+
+			/* Target port group designator */
+			desig = (struct spdk_scsi_desig_desc *)buf;
+			desig->code_set = SPDK_SPC_VPD_CODE_SET_BINARY;
+			desig->protocol_id = protocol_id;
+			desig->type = SPDK_SPC_VPD_IDENTIFIER_TYPE_TARGET_PORT_GROUP;
+			desig->association = SPDK_SPC_VPD_ASSOCIATION_TARGET_PORT;
+			desig->reserved0 = 0;
+			desig->piv = 1;
+			desig->reserved1 = 0;
+			desig->len = 4;
+			memset(desig->desig, 0, 4);
+			len += sizeof(struct spdk_scsi_desig_desc) + desig->len;
+
+			buf += sizeof(struct spdk_scsi_desig_desc) + desig->len;
+
+			/* Logical unit group designator */
+			desig = (struct spdk_scsi_desig_desc *)buf;
+			desig->code_set = SPDK_SPC_VPD_CODE_SET_BINARY;
+			desig->protocol_id = protocol_id;
+			desig->type = SPDK_SPC_VPD_IDENTIFIER_TYPE_LOGICAL_UNIT_GROUP;
+			desig->association = SPDK_SPC_VPD_ASSOCIATION_LOGICAL_UNIT;
+			desig->reserved0 = 0;
+			desig->piv = 1;
+			desig->reserved1 = 0;
+			desig->len = 4;
+			memset(desig->desig, 0, 2); /* Reserved */
+			to_be16(&desig->desig[2], dev->id);
+			len += sizeof(struct spdk_scsi_desig_desc) + desig->len;
+
+			to_be16(vpage->alloc_len, len);
+
+			break;
+		}
+
+		case SPDK_SPC_VPD_EXTENDED_INQUIRY_DATA: {
+			struct spdk_scsi_vpd_ext_inquiry *vext = (struct spdk_scsi_vpd_ext_inquiry *)vpage;
+
+			hlen = 4;
+			memset((uint8_t *)vext + hlen, 0, sizeof(*vext) - hlen);
+
+			/* RTO(3) GRD_CHK(2) APP_CHK(1) REF_CHK(0) */
+
+			/* GROUP_SUP(4) PRIOR_SUP(3) HEADSUP(2) ORDSUP(1) SIMPSUP(0) */
+			vext->sup = SPDK_SCSI_VEXT_HEADSUP | SPDK_SCSI_VEXT_SIMPSUP;
+
+			/* NV_SUP(1) V_SUP(0) */
+
+			/* Reserved[7-63] */
+
+			len = 64 - hlen;
+
+			/* PAGE LENGTH */
+			to_be16(vpage->alloc_len, len);
+			break;
+		}
+
+		case SPDK_SPC_VPD_MANAGEMENT_NETWORK_ADDRESSES:
+			/* PAGE LENGTH */
+			hlen = 4;
+
+			to_be16(vpage->alloc_len, len);
+			break;
+
+		case SPDK_SPC_VPD_MODE_PAGE_POLICY: {
+			struct spdk_scsi_mpage_policy_desc *pdesc =
+				(struct spdk_scsi_mpage_policy_desc *)vpage->params;
+
+			hlen = 4;
+
+			/* Mode page policy descriptor 1 */
+
+			/* POLICY PAGE CODE(5-0) */
+			/* all page code */
+			pdesc->page_code = 0x3f;
+
+			/* POLICY SUBPAGE CODE */
+			/* all sub page */
+			pdesc->sub_page_code = 0xff;
+
+			/* MLUS(7) MODE PAGE POLICY(1-0) */
+			/* MLUS own copy */
+			/* Shared MODE PAGE policy */
+			pdesc->policy = 0;
+			/* Reserved */
+			pdesc->reserved = 0;
+
+			len += 4;
+
+			to_be16(vpage->alloc_len, len);
+			break;
+		}
+
+		case SPDK_SPC_VPD_SCSI_PORTS: {
+			/* PAGE LENGTH */
+			hlen = 4;
+
+			/* Identification descriptor list */
+			for (i = 0; i < SPDK_SCSI_DEV_MAX_PORTS; i++) {
+				struct spdk_scsi_port_desc *sdesc;
+				struct spdk_scsi_tgt_port_desc *pdesc;
+
+				if (!dev->port[i].is_used) {
+					continue;
+				}
+
+				/* Identification descriptor N */
+				sdesc = (struct spdk_scsi_port_desc *)&vpage->params[len];
+
+				/* Reserved */
+				sdesc->reserved = 0;
+
+				/* RELATIVE PORT IDENTIFIER */
+				to_be16(&sdesc->rel_port_id, dev->port[i].index);
+
+				/* Reserved */
+				sdesc->reserved2 = 0;
+
+				/* INITIATOR PORT TRANSPORTID LENGTH */
+				sdesc->init_port_len = 0;
+
+				/* Reserved */
+				sdesc->init_port_id = 0;
+
+				/* TARGET PORT DESCRIPTORS LENGTH */
+				sdesc->tgt_desc_len = 0;
+
+				len += 12;
+
+				plen2 = 0;
+				/* Target port descriptor 1 */
+				pdesc = (struct spdk_scsi_tgt_port_desc *)sdesc->tgt_desc;
+
+				/* PROTOCOL IDENTIFIER(7-4) CODE SET(3-0) */
+				pdesc->code_set =
+					SPDK_SPC_PROTOCOL_IDENTIFIER_ISCSI << 4 |
+					SPDK_SPC_VPD_CODE_SET_UTF8;
+
+				/* PIV(7) ASSOCIATION(5-4) IDENTIFIER TYPE(3-0) */
+				pdesc->desig_type = SPDK_SPC_VPD_DESIG_PIV |
+						    SPDK_SPC_VPD_ASSOCIATION_TARGET_PORT << 4 |
+						    SPDK_SPC_VPD_IDENTIFIER_TYPE_SCSI_NAME;
+
+				/* Reserved */
+				pdesc->reserved = 0;
+
+				/* IDENTIFIER */
+				plen = snprintf((char *)pdesc->designator,
+						SPDK_SCSI_PORT_MAX_NAME_LENGTH, "%s",
+						dev->port[i].name);
+				pdesc->len = plen;
+
+				plen2 += 4 + plen;
+
+				/* TARGET PORT DESCRIPTORS LENGTH */
+				to_be16(&sdesc->tgt_desc_len, plen2);
+
+				len += plen2;
+			}
+
+			to_be16(vpage->alloc_len, len);
+			break;
+		}
+
+		case SPDK_SPC_VPD_BLOCK_LIMITS: {
+			uint32_t block_size = spdk_bdev_get_data_block_size(bdev);
+
+			/* PAGE LENGTH */
+			memset(&data[4], 0, 60);
+
+			hlen = 4;
+
+			/* WSNZ(0) */
+			/* support zero length in WRITE SAME */
+
+			/* MAXIMUM COMPARE AND WRITE LENGTH */
+			blocks = SPDK_WORK_ATS_BLOCK_SIZE / block_size;
+
+			if (blocks > 0xff) {
+				blocks = 0xff;
+			}
+
+			data[5] = (uint8_t)blocks;
+
+			/* force align to 4KB */
+			if (block_size < 4096) {
+				optimal_blocks = 4096 / block_size;
+			} else {
+				optimal_blocks = 1;
+			}
+
+			/* OPTIMAL TRANSFER LENGTH GRANULARITY */
+			to_be16(&data[6], optimal_blocks);
+
+			blocks = SPDK_WORK_BLOCK_SIZE / block_size;
+
+			/* MAXIMUM TRANSFER LENGTH */
+			to_be32(&data[8], blocks);
+			/* OPTIMAL TRANSFER LENGTH */
+			to_be32(&data[12], blocks);
+
+			/* MAXIMUM PREFETCH XDREAD XDWRITE TRANSFER LENGTH */
+
+			len = 20 - hlen;
+
+			if (spdk_bdev_io_type_supported(bdev, SPDK_BDEV_IO_TYPE_UNMAP)) {
+				/*
+				 * MAXIMUM UNMAP LBA COUNT: indicates the
+				 * maximum  number of LBAs that may be
+				 * unmapped by an UNMAP command.
+				 */
+				/* For now, choose 4MB as the maximum. */
+				to_be32(&data[20], 4194304);
+
+				/*
+				 * MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT:
+				 * indicates the maximum number of UNMAP
+				 * block descriptors that shall be contained
+				 * in the parameter data transferred to the
+				 * device server for an UNMAP command.
+				 * The bdev layer automatically splits unmap
+				 * requests, so pick an arbitrary high number here.
+				 */
+				to_be32(&data[24], DEFAULT_MAX_UNMAP_BLOCK_DESCRIPTOR_COUNT);
+
+				/*
+				 * The UGAVALID bit is left as 0 which means neither the
+				 * OPTIMAL UNMAP GRANULARITY nor the UNMAP GRANULARITY
+				 * ALIGNMENT fields are valid.
+				 */
+
+				/*
+				 * MAXIMUM WRITE SAME LENGTH: indicates the
+				 * maximum number of contiguous logical blocks
+				 * that the device server allows to be unmapped
+				 * or written in a single WRITE SAME command.
+				 */
+				to_be64(&data[36], 512);
+
+				/* Reserved */
+				/* not specified */
+				len = 64 - hlen;
+			}
+
+			to_be16(vpage->alloc_len, len);
+			break;
+		}
+
+		case SPDK_SPC_VPD_BLOCK_DEV_CHARS: {
+			/* PAGE LENGTH */
+			hlen = 4;
+			len = 64 - hlen;
+
+			to_be16(&data[4], DEFAULT_DISK_ROTATION_RATE);
+
+			/* Reserved */
+			data[6] = 0;
+			/* NOMINAL FORM FACTOR(3-0) */
+			data[7] = DEFAULT_DISK_FORM_FACTOR << 4;
+			/* Reserved */
+			memset(&data[8], 0, 64 - 8);
+
+			to_be16(vpage->alloc_len, len);
+			break;
+		}
+
+		case SPDK_SPC_VPD_BLOCK_THIN_PROVISION: {
+			if (!spdk_bdev_io_type_supported(bdev, SPDK_BDEV_IO_TYPE_UNMAP)) {
+				goto inq_error;
+			}
+
+			hlen = 4;
+			len = 7;
+
+			/*
+			 *  PAGE LENGTH : if the DP bit is set to one, then the
+			 *  page length shall be set  0004h.
+			 */
+			to_be16(&data[2], 0x0004);
+
+			/*
+			 * THRESHOLD EXPONENT : it indicates the threshold set
+			 * size in LBAs as a power of 2( i.e., the threshold
+			 * set size  = 2 ^ (threshold exponent).
+			 */
+			data[4] = 0;
+
+			/*
+			 * Set the LBPU bit to indicate  the support for UNMAP
+			 * command.
+			 */
+			data[5] |= SPDK_SCSI_UNMAP_LBPU;
+
+			/*
+			 * Set the provisioning type to thin provision.
+			 */
+			data[6] = SPDK_SCSI_UNMAP_THIN_PROVISIONING;
+
+			to_be16(vpage->alloc_len, len);
+			break;
+		}
+
+		default:
+			if (pc >= 0xc0 && pc <= 0xff) {
+				SPDK_DEBUGLOG(SPDK_LOG_SCSI, "Vendor specific INQUIRY VPD page 0x%x\n", pc);
+			} else {
+				SPDK_ERRLOG("unsupported INQUIRY VPD page 0x%x\n", pc);
+			}
+			goto inq_error;
+		}
+	} else {
+		struct spdk_scsi_cdb_inquiry_data *inqdata =
+			(struct spdk_scsi_cdb_inquiry_data *)data;
+
+		/* Standard INQUIRY data */
+		/* PERIPHERAL QUALIFIER(7-5) PERIPHERAL DEVICE TYPE(4-0) */
+		inqdata->peripheral_device_type = pd;
+		inqdata->peripheral_qualifier = SPDK_SPC_PERIPHERAL_QUALIFIER_CONNECTED;
+
+		/* RMB(7) */
+		inqdata->rmb = 0;
+
+		/* VERSION */
+		/* See SPC3/SBC2/MMC4/SAM2 for more details */
+		inqdata->version = SPDK_SPC_VERSION_SPC3;
+
+		/* NORMACA(5) HISUP(4) RESPONSE DATA FORMAT(3-0) */
+		/* format 2 */ /* hierarchical support */
+		inqdata->response = 2 | 1 << 4;
+
+		hlen = 5;
+
+		/* SCCS(7) ACC(6) TPGS(5-4) 3PC(3) PROTECT(0) */
+		/* Not support TPGS */
+		inqdata->flags = 0;
+
+		/* MULTIP */
+		inqdata->flags2 = 0x10;
+
+		/* WBUS16(5) SYNC(4) LINKED(3) CMDQUE(1) VS(0) */
+		/* CMDQUE */
+		inqdata->flags3 = 0x2;
+
+		/* T10 VENDOR IDENTIFICATION */
+		spdk_strcpy_pad(inqdata->t10_vendor_id, DEFAULT_DISK_VENDOR, 8, ' ');
+
+		/* PRODUCT IDENTIFICATION */
+		spdk_strcpy_pad(inqdata->product_id, spdk_bdev_get_product_name(bdev), 16, ' ');
+
+		/* PRODUCT REVISION LEVEL */
+		spdk_strcpy_pad(inqdata->product_rev, DEFAULT_DISK_REVISION, 4, ' ');
+
+		/*
+		 * Standard inquiry data ends here.  Only populate remaining fields if alloc_len
+		 *  indicates enough space to hold it.
+		 */
+		len = INQUIRY_OFFSET(product_rev) - 5;
+
+		if (alloc_len >= INQUIRY_OFFSET(vendor)) {
+			/* Vendor specific */
+			memset(inqdata->vendor, 0x20, 20);
+			len += sizeof(inqdata->vendor);
+		}
+
+		if (alloc_len >= INQUIRY_OFFSET(ius)) {
+			/* CLOCKING(3-2) QAS(1) IUS(0) */
+			inqdata->ius = 0;
+			len += sizeof(inqdata->ius);
+		}
+
+		if (alloc_len >= INQUIRY_OFFSET(reserved)) {
+			/* Reserved */
+			inqdata->reserved = 0;
+			len += sizeof(inqdata->reserved);
+		}
+
+		/* VERSION DESCRIPTOR 1-8 */
+		if (alloc_len >= INQUIRY_OFFSET(reserved) + 2) {
+			to_be16(&inqdata->desc[0], 0x0960);
+			len += 2;
+		}
+
+		if (alloc_len >= INQUIRY_OFFSET(reserved) + 4) {
+			to_be16(&inqdata->desc[2], 0x0300); /* SPC-3 (no version claimed) */
+			len += 2;
+		}
+
+		if (alloc_len >= INQUIRY_OFFSET(reserved) + 6) {
+			to_be16(&inqdata->desc[4], 0x320); /* SBC-2 (no version claimed) */
+			len += 2;
+		}
+
+		if (alloc_len >= INQUIRY_OFFSET(reserved) + 8) {
+			to_be16(&inqdata->desc[6], 0x0040); /* SAM-2 (no version claimed) */
+			len += 2;
+		}
+
+		/*
+		 * We only fill out 4 descriptors, but if the allocation length goes past
+		 *  that, zero the remaining bytes.  This fixes some SCSI compliance tests
+		 *  which expect a full 96 bytes to be returned, including the unpopulated
+		 *  version descriptors 5-8 (4 * 2 = 8 bytes) plus the 22 bytes of reserved
+		 *  space (bytes 74-95) - for a total of 30 bytes.
+		 */
+		if (alloc_len > INQUIRY_OFFSET(reserved) + 8) {
+			i = alloc_len - (INQUIRY_OFFSET(reserved) + 8);
+			if (i > 30) {
+				i = 30;
+			}
+			memset(&inqdata->desc[8], 0, i);
+			len += i;
+		}
+
+		/* ADDITIONAL LENGTH */
+		inqdata->add_len = len;
+	}
+
+	return hlen + len;
+
+inq_error:
+	task->data_transferred = 0;
+	spdk_scsi_task_set_status(task, SPDK_SCSI_STATUS_CHECK_CONDITION,
+				  SPDK_SCSI_SENSE_NO_SENSE,
+				  SPDK_SCSI_ASC_NO_ADDITIONAL_SENSE,
+				  SPDK_SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
+	return -1;
+}
+
+static void
+mode_sense_page_init(uint8_t *buf, int len, int page, int subpage)
+{
+	if (!buf) {
+		return;
+	}
+
+	memset(buf, 0, len);
+	if (subpage != 0) {
+		buf[0] = page | 0x40; /* PAGE + SPF=1 */
+		buf[1] = subpage;
+		to_be16(&buf[2], len - 4);
+	} else {
+		buf[0] = page;
+		buf[1] = len - 2;
+	}
+}
+
+static int
+bdev_scsi_mode_sense_page(struct spdk_bdev *bdev,
+			  uint8_t *cdb, int pc, int page, int subpage,
+			  uint8_t *data, struct spdk_scsi_task *task)
+{
+	uint8_t *cp = data;
+	int len = 0;
+	int plen;
+	int i;
+
+	if (pc == 0x00) {
+		/* Current values */
+	} else if (pc == 0x01) {
+		/* Changeable values */
+		/* As we currently do not support changeable values,
+		   all parameters are reported as zero. */
+	} else if (pc == 0x02) {
+		/* Default values */
+	} else {
+		/* Saved values not supported */
+		spdk_scsi_task_set_status(task, SPDK_SCSI_STATUS_CHECK_CONDITION,
+					  SPDK_SCSI_SENSE_ILLEGAL_REQUEST,
+					  SPDK_SCSI_ASC_SAVING_PARAMETERS_NOT_SUPPORTED,
+					  SPDK_SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
+		return -1;
+	}
+
+	switch (page) {
+	case 0x00:
+		/* Vendor specific */
+		break;
+	case 0x01:
+		/* Read-Write Error Recovery */
+		SPDK_DEBUGLOG(SPDK_LOG_SCSI,
+			      "MODE_SENSE Read-Write Error Recovery\n");
+		if (subpage != 0x00) {
+			break;
+		}
+		plen = 0x0a + 2;
+		mode_sense_page_init(cp, plen, page, subpage);
+		len += plen;
+		break;
+	case 0x02:
+		/* Disconnect-Reconnect */
+		SPDK_DEBUGLOG(SPDK_LOG_SCSI,
+			      "MODE_SENSE Disconnect-Reconnect\n");
+		if (subpage != 0x00) {
+			break;
+		}
+		plen = 0x0e + 2;
+		mode_sense_page_init(cp, plen, page, subpage);
+		len += plen;
+		break;
+	case 0x03:
+		/* Obsolete (Format Device) */
+		break;
+	case 0x04:
+		/* Obsolete (Rigid Disk Geometry) */
+		break;
+	case 0x05:
+		/* Obsolete (Rigid Disk Geometry) */
+		break;
+	case 0x06:
+		/* Reserved */
+		break;
+	case 0x07:
+		/* Verify Error Recovery */
+		SPDK_DEBUGLOG(SPDK_LOG_SCSI,
+			      "MODE_SENSE Verify Error Recovery\n");
+
+		if (subpage != 0x00) {
+			break;
+		}
+
+		plen = 0x0a + 2;
+		mode_sense_page_init(cp, plen, page, subpage);
+		len += plen;
+		break;
+	case 0x08: {
+		/* Caching */
+		SPDK_DEBUGLOG(SPDK_LOG_SCSI, "MODE_SENSE Caching\n");
+		if (subpage != 0x00) {
+			break;
+		}
+
+		plen = 0x12 + 2;
+		mode_sense_page_init(cp, plen, page, subpage);
+
+		if (cp && spdk_bdev_has_write_cache(bdev) && pc != 0x01) {
+			cp[2] |= 0x4;        /* WCE */
+		}
+
+		/* Read Cache Disable (RCD) = 1 */
+		if (cp && pc != 0x01) {
+			cp[2] |= 0x1;
+		}
+
+		len += plen;
+		break;
+	}
+	case 0x09:
+		/* Obsolete */
+		break;
+	case 0x0a:
+		switch (subpage) {
+		case 0x00:
+			/* Control */
+			SPDK_DEBUGLOG(SPDK_LOG_SCSI,
+				      "MODE_SENSE Control\n");
+			plen = 0x0a + 2;
+			mode_sense_page_init(cp, plen, page, subpage);
+			len += plen;
+			break;
+		case 0x01:
+			/* Control Extension */
+			SPDK_DEBUGLOG(SPDK_LOG_SCSI,
+				      "MODE_SENSE Control Extension\n");
+			plen = 0x1c + 4;
+			mode_sense_page_init(cp, plen, page, subpage);
+			len += plen;
+			break;
+		case 0xff:
+			/* All subpages */
+			len += bdev_scsi_mode_sense_page(bdev,
+							 cdb, pc, page,
+							 0x00,
+							 cp ? &cp[len] : NULL, task);
+			len += bdev_scsi_mode_sense_page(bdev,
+							 cdb, pc, page,
+							 0x01,
+							 cp ? &cp[len] : NULL, task);
+			break;
+		default:
+			/* 0x02-0x3e: Reserved */
+			break;
+		}
+		break;
+	case 0x0b:
+		/* Obsolete (Medium Types Supported) */
+		break;
+	case 0x0c:
+		/* Obsolete (Notch And Partitio) */
+		break;
+	case 0x0d:
+		/* Obsolete */
+		break;
+	case 0x0e:
+	case 0x0f:
+		/* Reserved */
+		break;
+	case 0x10:
+		/* XOR Control */
+		SPDK_DEBUGLOG(SPDK_LOG_SCSI, "MODE_SENSE XOR Control\n");
+		if (subpage != 0x00) {
+			break;
+		}
+		plen = 0x16 + 2;
+		mode_sense_page_init(cp, plen, page, subpage);
+		len += plen;
+		break;
+	case 0x11:
+	case 0x12:
+	case 0x13:
+		/* Reserved */
+		break;
+	case 0x14:
+		/* Enclosure Services Management */
+		break;
+	case 0x15:
+	case 0x16:
+	case 0x17:
+		/* Reserved */
+		break;
+	case 0x18:
+		/* Protocol-Specific LUN */
+		break;
+	case 0x19:
+		/* Protocol-Specific Port */
+		break;
+	case 0x1a:
+		/* Power Condition */
+		SPDK_DEBUGLOG(SPDK_LOG_SCSI,
+			      "MODE_SENSE Power Condition\n");
+		if (subpage != 0x00) {
+			break;
+		}
+		plen = 0x0a + 2;
+		mode_sense_page_init(cp, plen, page, subpage);
+		len += plen;
+		break;
+	case 0x1b:
+		/* Reserved */
+		break;
+	case 0x1c:
+		/* Informational Exceptions Control */
+		SPDK_DEBUGLOG(SPDK_LOG_SCSI,
+			      "MODE_SENSE Informational Exceptions Control\n");
+		if (subpage != 0x00) {
+			break;
+		}
+
+		plen = 0x0a + 2;
+		mode_sense_page_init(cp, plen, page, subpage);
+		len += plen;
+		break;
+	case 0x1d:
+	case 0x1e:
+	case 0x1f:
+		/* Reserved */
+		break;
+	case 0x20:
+	case 0x21:
+	case 0x22:
+	case 0x23:
+	case 0x24:
+	case 0x25:
+	case 0x26:
+	case 0x27:
+	case 0x28:
+	case 0x29:
+	case 0x2a:
+	case 0x2b:
+	case 0x2c:
+	case 0x2d:
+	case 0x2e:
+	case 0x2f:
+	case 0x30:
+	case 0x31:
+	case 0x32:
+	case 0x33:
+	case 0x34:
+	case 0x35:
+	case 0x36:
+	case 0x37:
+	case 0x38:
+	case 0x39:
+	case 0x3a:
+	case 0x3b:
+	case 0x3c:
+	case 0x3d:
+	case 0x3e:
+		/* Vendor-specific */
+		break;
+	case 0x3f:
+		switch (subpage) {
+		case 0x00:
+			/* All mode pages */
+			for (i = 0x00; i < 0x3e; i ++) {
+				len += bdev_scsi_mode_sense_page(
+					       bdev, cdb, pc, i, 0x00,
+					       cp ? &cp[len] : NULL, task);
+			}
+			break;
+		case 0xff:
+			/* All mode pages and subpages */
+			for (i = 0x00; i < 0x3e; i ++) {
+				len += bdev_scsi_mode_sense_page(
+					       bdev, cdb, pc, i, 0x00,
+					       cp ? &cp[len] : NULL, task);
+			}
+			for (i = 0x00; i < 0x3e; i ++) {
+				len += bdev_scsi_mode_sense_page(
+					       bdev, cdb, pc, i, 0xff,
+					       cp ? &cp[len] : NULL, task);
+			}
+			break;
+		default:
+			/* 0x01-0x3e: Reserved */
+			break;
+		}
+	}
+
+	return len;
+}
+
+static int
+bdev_scsi_mode_sense(struct spdk_bdev *bdev, int md,
+		     uint8_t *cdb, int dbd, int llbaa, int pc,
+		     int page, int subpage, uint8_t *data, struct spdk_scsi_task *task)
+{
+	uint64_t num_blocks = spdk_bdev_get_num_blocks(bdev);
+	uint32_t block_size = spdk_bdev_get_data_block_size(bdev);
+	uint8_t *hdr, *bdesc, *pages;
+	int hlen;
+	int blen;
+	int plen, total;
+
+	assert(md == 6 || md == 10);
+
+	if (md == 6) {
+		hlen = 4;
+		blen = 8; /* For MODE SENSE 6 only short LBA */
+	} else {
+		hlen = 8;
+		blen = llbaa ? 16 : 8;
+	}
+
+	if (dbd) {
+		blen = 0;
+	}
+
+	pages = data ? &data[hlen + blen] : NULL;
+	plen = bdev_scsi_mode_sense_page(bdev, cdb, pc, page,
+					 subpage,
+					 pages, task);
+	if (plen < 0) {
+		return -1;
+	}
+
+	total = hlen + blen + plen;
+	if (data == NULL) {
+		return total;
+	}
+
+	hdr = &data[0];
+	if (hlen == 4) {
+		hdr[0] = total - 1;            /* Mode Data Length */
+		hdr[1] = 0;                    /* Medium Type */
+		hdr[2] = 0;                    /* Device-Specific Parameter */
+		hdr[3] = blen;                 /* Block Descripter Length */
+	} else {
+		to_be16(&hdr[0], total - 2);   /* Mode Data Length */
+		hdr[2] = 0;                    /* Medium Type */
+		hdr[3] = 0;                    /* Device-Specific Parameter */
+		hdr[4] = llbaa ? 0x1 : 0;      /* Long/short LBA */
+		hdr[5] = 0;                    /* Reserved */
+		to_be16(&hdr[6], blen);        /* Block Descripter Length */
+	}
+
+	bdesc = &data[hlen];
+	if (blen == 16) {
+		/* Number of Blocks */
+		to_be64(&bdesc[0], num_blocks);
+		/* Reserved */
+		memset(&bdesc[8], 0, 4);
+		/* Block Length */
+		to_be32(&bdesc[12], block_size);
+	} else if (blen == 8) {
+		/* Number of Blocks */
+		if (num_blocks > 0xffffffffULL) {
+			memset(&bdesc[0], 0xff, 4);
+		} else {
+			to_be32(&bdesc[0], num_blocks);
+		}
+
+		/* Block Length */
+		to_be32(&bdesc[4], block_size);
+	}
+
+	return total;
+}
+
+static void
+bdev_scsi_task_complete_cmd(struct spdk_bdev_io *bdev_io, bool success,
+			    void *cb_arg)
+{
+	struct spdk_scsi_task *task = cb_arg;
+	int sc, sk, asc, ascq;
+
+	spdk_bdev_io_get_scsi_status(bdev_io, &sc, &sk, &asc, &ascq);
+
+	spdk_bdev_free_io(bdev_io);
+
+	spdk_scsi_task_set_status(task, sc, sk, asc, ascq);
+	scsi_lun_complete_task(task->lun, task);
+}
+
+static void
+bdev_scsi_read_task_complete_cmd(struct spdk_bdev_io *bdev_io, bool success,
+				 void *cb_arg)
+{
+	struct spdk_scsi_task *task = cb_arg;
+	int sc, sk, asc, ascq;
+
+	task->bdev_io = bdev_io;
+
+	spdk_bdev_io_get_scsi_status(bdev_io, &sc, &sk, &asc, &ascq);
+
+	spdk_scsi_task_set_status(task, sc, sk, asc, ascq);
+	scsi_lun_complete_task(task->lun, task);
+}
+
+static void
+bdev_scsi_task_complete_reset(struct spdk_bdev_io *bdev_io, bool success,
+			      void *cb_arg)
+{
+	struct spdk_scsi_task *task = cb_arg;
+
+	spdk_bdev_free_io(bdev_io);
+
+	if (success) {
+		task->response = SPDK_SCSI_TASK_MGMT_RESP_SUCCESS;
+	}
+
+	scsi_lun_complete_reset_task(task->lun, task);
+}
+
+static void
+bdev_scsi_queue_io(struct spdk_scsi_task *task, spdk_bdev_io_wait_cb cb_fn, void *cb_arg)
+{
+	struct spdk_scsi_lun *lun = task->lun;
+	struct spdk_bdev *bdev = lun->bdev;
+	struct spdk_io_channel *ch = lun->io_channel;
+	int rc;
+
+	task->bdev_io_wait.bdev = bdev;
+	task->bdev_io_wait.cb_fn = cb_fn;
+	task->bdev_io_wait.cb_arg = cb_arg;
+
+	rc = spdk_bdev_queue_io_wait(bdev, ch, &task->bdev_io_wait);
+	if (rc != 0) {
+		assert(false);
+	}
+}
+
+static int
+bdev_scsi_sync(struct spdk_bdev *bdev, struct spdk_bdev_desc *bdev_desc,
+	       struct spdk_io_channel *bdev_ch, struct spdk_scsi_task *task,
+	       uint64_t lba, uint32_t num_blocks)
+{
+	uint64_t bdev_num_blocks;
+	int rc;
+
+	if (num_blocks == 0) {
+		return SPDK_SCSI_TASK_COMPLETE;
+	}
+
+	bdev_num_blocks = spdk_bdev_get_num_blocks(bdev);
+
+	if (lba >= bdev_num_blocks || num_blocks > bdev_num_blocks ||
+	    lba > (bdev_num_blocks - num_blocks)) {
+		SPDK_ERRLOG("end of media\n");
+		spdk_scsi_task_set_status(task, SPDK_SCSI_STATUS_CHECK_CONDITION,
+					  SPDK_SCSI_SENSE_NO_SENSE,
+					  SPDK_SCSI_ASC_NO_ADDITIONAL_SENSE,
+					  SPDK_SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
+		return SPDK_SCSI_TASK_COMPLETE;
+	}
+
+	rc = spdk_bdev_flush_blocks(bdev_desc, bdev_ch, lba, num_blocks,
+				    bdev_scsi_task_complete_cmd, task);
+
+	if (rc) {
+		if (rc == -ENOMEM) {
+			bdev_scsi_queue_io(task, bdev_scsi_process_block_resubmit, task);
+			return SPDK_SCSI_TASK_PENDING;
+		}
+		SPDK_ERRLOG("spdk_bdev_flush_blocks() failed\n");
+		spdk_scsi_task_set_status(task, SPDK_SCSI_STATUS_CHECK_CONDITION,
+					  SPDK_SCSI_SENSE_NO_SENSE,
+					  SPDK_SCSI_ASC_NO_ADDITIONAL_SENSE,
+					  SPDK_SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
+		return SPDK_SCSI_TASK_COMPLETE;
+	}
+	task->data_transferred = 0;
+	return SPDK_SCSI_TASK_PENDING;
+}
+
+static uint64_t
+_bytes_to_blocks(uint32_t block_size, uint64_t offset_bytes, uint64_t *offset_blocks,
+		 uint64_t num_bytes, uint64_t *num_blocks)
+{
+	uint8_t shift_cnt;
+
+	/* Avoid expensive div operations if possible. These spdk_u32 functions are very cheap. */
+	if (spdk_likely(spdk_u32_is_pow2(block_size))) {
+		shift_cnt = spdk_u32log2(block_size);
+		*offset_blocks = offset_bytes >> shift_cnt;
+		*num_blocks = num_bytes >> shift_cnt;
+		return (offset_bytes - (*offset_blocks << shift_cnt)) |
+		       (num_bytes - (*num_blocks << shift_cnt));
+	} else {
+		*offset_blocks = offset_bytes / block_size;
+		*num_blocks = num_bytes / block_size;
+		return (offset_bytes % block_size) | (num_bytes % block_size);
+	}
+}
+
+static int
+bdev_scsi_readwrite(struct spdk_bdev *bdev, struct spdk_bdev_desc *bdev_desc,
+		    struct spdk_io_channel *bdev_ch, struct spdk_scsi_task *task,
+		    uint64_t lba, uint32_t xfer_len, bool is_read)
+{
+	uint64_t bdev_num_blocks, offset_blocks, num_blocks;
+	uint32_t max_xfer_len, block_size;
+	int sk = SPDK_SCSI_SENSE_NO_SENSE, asc = SPDK_SCSI_ASC_NO_ADDITIONAL_SENSE;
+	int rc;
+
+	task->data_transferred = 0;
+
+	if (spdk_unlikely(task->dxfer_dir != SPDK_SCSI_DIR_NONE &&
+			  task->dxfer_dir != (is_read ? SPDK_SCSI_DIR_FROM_DEV : SPDK_SCSI_DIR_TO_DEV))) {
+		SPDK_ERRLOG("Incorrect data direction\n");
+		goto check_condition;
+	}
+
+	bdev_num_blocks = spdk_bdev_get_num_blocks(bdev);
+	if (spdk_unlikely(bdev_num_blocks <= lba || bdev_num_blocks - lba < xfer_len)) {
+		SPDK_DEBUGLOG(SPDK_LOG_SCSI, "end of media\n");
+		sk = SPDK_SCSI_SENSE_ILLEGAL_REQUEST;
+		asc = SPDK_SCSI_ASC_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
+		goto check_condition;
+	}
+
+	if (spdk_unlikely(xfer_len == 0)) {
+		task->status = SPDK_SCSI_STATUS_GOOD;
+		return SPDK_SCSI_TASK_COMPLETE;
+	}
+
+	block_size = spdk_bdev_get_data_block_size(bdev);
+
+	/* Transfer Length is limited to the Block Limits VPD page Maximum Transfer Length */
+	max_xfer_len = SPDK_WORK_BLOCK_SIZE / block_size;
+	if (spdk_unlikely(xfer_len > max_xfer_len)) {
+		SPDK_ERRLOG("xfer_len %" PRIu32 " > maximum transfer length %" PRIu32 "\n",
+			    xfer_len, max_xfer_len);
+		sk = SPDK_SCSI_SENSE_ILLEGAL_REQUEST;
+		asc = SPDK_SCSI_ASC_INVALID_FIELD_IN_CDB;
+		goto check_condition;
+	}
+
+	if (!is_read) {
+		/* Additional check for Transfer Length */
+		if (xfer_len * block_size > task->transfer_len) {
+			SPDK_ERRLOG("xfer_len %" PRIu32 " * block_size %" PRIu32 " > transfer_len %u\n",
+				    xfer_len, block_size, task->transfer_len);
+			goto check_condition;
+		}
+	}
+
+	if (_bytes_to_blocks(block_size, task->offset, &offset_blocks, task->length, &num_blocks) != 0) {
+		SPDK_ERRLOG("task's offset %" PRIu64 " or length %" PRIu32 " is not block multiple\n",
+			    task->offset, task->length);
+		goto check_condition;
+	}
+
+	offset_blocks += lba;
+
+	SPDK_DEBUGLOG(SPDK_LOG_SCSI,
+		      "%s: lba=%"PRIu64", len=%"PRIu64"\n",
+		      is_read ? "Read" : "Write", offset_blocks, num_blocks);
+
+	if (is_read) {
+		rc = spdk_bdev_readv_blocks(bdev_desc, bdev_ch, task->iovs, task->iovcnt,
+					    offset_blocks, num_blocks,
+					    bdev_scsi_read_task_complete_cmd, task);
+	} else {
+		rc = spdk_bdev_writev_blocks(bdev_desc, bdev_ch, task->iovs, task->iovcnt,
+					     offset_blocks, num_blocks,
+					     bdev_scsi_task_complete_cmd, task);
+	}
+
+	if (rc) {
+		if (rc == -ENOMEM) {
+			bdev_scsi_queue_io(task, bdev_scsi_process_block_resubmit, task);
+			return SPDK_SCSI_TASK_PENDING;
+		}
+		SPDK_ERRLOG("spdk_bdev_%s_blocks() failed\n", is_read ? "readv" : "writev");
+		goto check_condition;
+	}
+
+	task->data_transferred = task->length;
+	return SPDK_SCSI_TASK_PENDING;
+
+check_condition:
+	spdk_scsi_task_set_status(task, SPDK_SCSI_STATUS_CHECK_CONDITION, sk, asc,
+				  SPDK_SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
+	return SPDK_SCSI_TASK_COMPLETE;
+}
+
+struct spdk_bdev_scsi_unmap_ctx {
+	struct spdk_scsi_task		*task;
+	struct spdk_scsi_unmap_bdesc	desc[DEFAULT_MAX_UNMAP_BLOCK_DESCRIPTOR_COUNT];
+	uint32_t			count;
+};
+
+static int bdev_scsi_unmap(struct spdk_bdev *bdev, struct spdk_bdev_desc *bdev_desc,
+			   struct spdk_io_channel *bdev_ch, struct spdk_scsi_task *task,
+			   struct spdk_bdev_scsi_unmap_ctx *ctx);
+
+static void
+bdev_scsi_task_complete_unmap_cmd(struct spdk_bdev_io *bdev_io, bool success,
+				  void *cb_arg)
+{
+	struct spdk_bdev_scsi_unmap_ctx *ctx = cb_arg;
+	struct spdk_scsi_task *task = ctx->task;
+	int sc, sk, asc, ascq;
+
+	ctx->count--;
+
+	task->bdev_io = bdev_io;
+
+	if (task->status == SPDK_SCSI_STATUS_GOOD) {
+		spdk_bdev_io_get_scsi_status(bdev_io, &sc, &sk, &asc, &ascq);
+		spdk_scsi_task_set_status(task, sc, sk, asc, ascq);
+	}
+
+	if (ctx->count == 0) {
+		scsi_lun_complete_task(task->lun, task);
+		free(ctx);
+	}
+}
+
+static int
+__copy_desc(struct spdk_bdev_scsi_unmap_ctx *ctx, uint8_t *data, size_t data_len)
+{
+	uint16_t	desc_data_len;
+	uint16_t	desc_count;
+
+	if (!data) {
+		return -EINVAL;
+	}
+
+	if (data_len < 8) {
+		/* We can't even get the reported length, so fail. */
+		return -EINVAL;
+	}
+
+	desc_data_len = from_be16(&data[2]);
+	desc_count = desc_data_len / 16;
+
+	if (desc_data_len > (data_len - 8)) {
+		SPDK_ERRLOG("Error - desc_data_len (%u) > data_len (%lu) - 8\n",
+			    desc_data_len, data_len);
+		return -EINVAL;
+	}
+
+	if (desc_count > DEFAULT_MAX_UNMAP_BLOCK_DESCRIPTOR_COUNT) {
+		SPDK_ERRLOG("desc_count (%u) greater than max allowed (%u)\n",
+			    desc_count, DEFAULT_MAX_UNMAP_BLOCK_DESCRIPTOR_COUNT);
+		return -EINVAL;
+	}
+
+	memcpy(ctx->desc, &data[8], desc_data_len);
+	return desc_count;
+}
+
+static void
+bdev_scsi_unmap_resubmit(void *arg)
+{
+	struct spdk_bdev_scsi_unmap_ctx	*ctx = arg;
+	struct spdk_scsi_task *task = ctx->task;
+	struct spdk_scsi_lun *lun = task->lun;
+
+	bdev_scsi_unmap(lun->bdev, lun->bdev_desc, lun->io_channel, task, ctx);
+}
+
+static int
+bdev_scsi_unmap(struct spdk_bdev *bdev, struct spdk_bdev_desc *bdev_desc,
+		struct spdk_io_channel *bdev_ch, struct spdk_scsi_task *task,
+		struct spdk_bdev_scsi_unmap_ctx *ctx)
+{
+	uint8_t				*data;
+	int				i, desc_count = -1;
+	int				data_len;
+	int				rc;
+
+	assert(task->status == SPDK_SCSI_STATUS_GOOD);
+
+	if (ctx == NULL) {
+		ctx = calloc(1, sizeof(*ctx));
+		if (!ctx) {
+			spdk_scsi_task_set_status(task, SPDK_SCSI_STATUS_CHECK_CONDITION,
+						  SPDK_SCSI_SENSE_NO_SENSE,
+						  SPDK_SCSI_ASC_NO_ADDITIONAL_SENSE,
+						  SPDK_SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
+			return SPDK_SCSI_TASK_COMPLETE;
+		}
+
+		ctx->task = task;
+		ctx->count = 0;
+	}
+
+
+	if (task->iovcnt == 1) {
+		data = (uint8_t *)task->iovs[0].iov_base;
+		data_len = task->iovs[0].iov_len;
+		desc_count = __copy_desc(ctx, data, data_len);
+	} else {
+		data = spdk_scsi_task_gather_data(task, &data_len);
+		if (data) {
+			desc_count = __copy_desc(ctx, data, data_len);
+			free(data);
+		}
+	}
+
+	if (desc_count < 0) {
+		spdk_scsi_task_set_status(task, SPDK_SCSI_STATUS_CHECK_CONDITION,
+					  SPDK_SCSI_SENSE_ILLEGAL_REQUEST,
+					  SPDK_SCSI_ASC_INVALID_FIELD_IN_CDB,
+					  SPDK_SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
+		free(ctx);
+		return SPDK_SCSI_TASK_COMPLETE;
+	}
+
+	for (i = ctx->count; i < desc_count; i++) {
+		struct spdk_scsi_unmap_bdesc	*desc;
+		uint64_t offset_blocks;
+		uint64_t num_blocks;
+
+		desc = &ctx->desc[i];
+
+		offset_blocks = from_be64(&desc->lba);
+		num_blocks = from_be32(&desc->block_count);
+
+		if (num_blocks == 0) {
+			continue;
+		}
+
+		ctx->count++;
+		rc = spdk_bdev_unmap_blocks(bdev_desc, bdev_ch, offset_blocks, num_blocks,
+					    bdev_scsi_task_complete_unmap_cmd, ctx);
+
+		if (rc) {
+			if (rc == -ENOMEM) {
+				bdev_scsi_queue_io(task, bdev_scsi_unmap_resubmit, ctx);
+				/* Unmap was not yet submitted to bdev */
+				ctx->count--;
+				return SPDK_SCSI_TASK_PENDING;
+			}
+			SPDK_ERRLOG("SCSI Unmapping failed\n");
+			spdk_scsi_task_set_status(task, SPDK_SCSI_STATUS_CHECK_CONDITION,
+						  SPDK_SCSI_SENSE_NO_SENSE,
+						  SPDK_SCSI_ASC_NO_ADDITIONAL_SENSE,
+						  SPDK_SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
+			ctx->count--;
+			/* We can't complete here - we may have to wait for previously
+			 * submitted unmaps to complete */
+			break;
+		}
+	}
+
+	if (ctx->count == 0) {
+		free(ctx);
+		return SPDK_SCSI_TASK_COMPLETE;
+	}
+
+	return SPDK_SCSI_TASK_PENDING;
+}
+
+static int
+bdev_scsi_process_block(struct spdk_scsi_task *task)
+{
+	struct spdk_scsi_lun *lun = task->lun;
+	struct spdk_bdev *bdev = lun->bdev;
+	uint64_t lba;
+	uint32_t xfer_len;
+	uint32_t len = 0;
+	uint8_t *cdb = task->cdb;
+
+	/* XXX: We need to support FUA bit for writes! */
+	switch (cdb[0]) {
+	case SPDK_SBC_READ_6:
+	case SPDK_SBC_WRITE_6:
+		lba = (uint64_t)cdb[1] << 16;
+		lba |= (uint64_t)cdb[2] << 8;
+		lba |= (uint64_t)cdb[3];
+		xfer_len = cdb[4];
+		if (xfer_len == 0) {
+			xfer_len = 256;
+		}
+		return bdev_scsi_readwrite(bdev, lun->bdev_desc, lun->io_channel,
+					   task, lba, xfer_len,
+					   cdb[0] == SPDK_SBC_READ_6);
+
+	case SPDK_SBC_READ_10:
+	case SPDK_SBC_WRITE_10:
+		lba = from_be32(&cdb[2]);
+		xfer_len = from_be16(&cdb[7]);
+		return bdev_scsi_readwrite(bdev, lun->bdev_desc, lun->io_channel,
+					   task, lba, xfer_len,
+					   cdb[0] == SPDK_SBC_READ_10);
+
+	case SPDK_SBC_READ_12:
+	case SPDK_SBC_WRITE_12:
+		lba = from_be32(&cdb[2]);
+		xfer_len = from_be32(&cdb[6]);
+		return bdev_scsi_readwrite(bdev, lun->bdev_desc, lun->io_channel,
+					   task, lba, xfer_len,
+					   cdb[0] == SPDK_SBC_READ_12);
+	case SPDK_SBC_READ_16:
+	case SPDK_SBC_WRITE_16:
+		lba = from_be64(&cdb[2]);
+		xfer_len = from_be32(&cdb[10]);
+		return bdev_scsi_readwrite(bdev, lun->bdev_desc, lun->io_channel,
+					   task, lba, xfer_len,
+					   cdb[0] == SPDK_SBC_READ_16);
+
+	case SPDK_SBC_READ_CAPACITY_10: {
+		uint64_t num_blocks = spdk_bdev_get_num_blocks(bdev);
+		uint8_t buffer[8];
+
+		if (num_blocks - 1 > 0xffffffffULL) {
+			memset(buffer, 0xff, 4);
+		} else {
+			to_be32(buffer, num_blocks - 1);
+		}
+		to_be32(&buffer[4], spdk_bdev_get_data_block_size(bdev));
+
+		len = spdk_min(task->length, sizeof(buffer));
+		if (spdk_scsi_task_scatter_data(task, buffer, len) < 0) {
+			break;
+		}
+
+		task->data_transferred = len;
+		task->status = SPDK_SCSI_STATUS_GOOD;
+		break;
+	}
+
+	case SPDK_SPC_SERVICE_ACTION_IN_16:
+		switch (cdb[1] & 0x1f) { /* SERVICE ACTION */
+		case SPDK_SBC_SAI_READ_CAPACITY_16: {
+			uint8_t buffer[32] = {0};
+
+			to_be64(&buffer[0], spdk_bdev_get_num_blocks(bdev) - 1);
+			to_be32(&buffer[8], spdk_bdev_get_data_block_size(bdev));
+			/*
+			 * Set the TPE bit to 1 to indicate thin provisioning.
+			 * The position of TPE bit is the 7th bit in 14th byte
+			 * in READ CAPACITY (16) parameter data.
+			 */
+			if (spdk_bdev_io_type_supported(bdev, SPDK_BDEV_IO_TYPE_UNMAP)) {
+				buffer[14] |= 1 << 7;
+			}
+
+			len = spdk_min(from_be32(&cdb[10]), sizeof(buffer));
+			if (spdk_scsi_task_scatter_data(task, buffer, len) < 0) {
+				break;
+			}
+
+			task->data_transferred = len;
+			task->status = SPDK_SCSI_STATUS_GOOD;
+			break;
+		}
+
+		default:
+			return SPDK_SCSI_TASK_UNKNOWN;
+		}
+		break;
+
+	case SPDK_SBC_SYNCHRONIZE_CACHE_10:
+	case SPDK_SBC_SYNCHRONIZE_CACHE_16:
+		if (cdb[0] == SPDK_SBC_SYNCHRONIZE_CACHE_10) {
+			lba = from_be32(&cdb[2]);
+			len = from_be16(&cdb[7]);
+		} else {
+			lba = from_be64(&cdb[2]);
+			len = from_be32(&cdb[10]);
+		}
+
+		if (len == 0) {
+			len = spdk_bdev_get_num_blocks(bdev) - lba;
+		}
+
+		return bdev_scsi_sync(bdev, lun->bdev_desc, lun->io_channel, task, lba, len);
+		break;
+
+	case SPDK_SBC_UNMAP:
+		return bdev_scsi_unmap(bdev, lun->bdev_desc, lun->io_channel, task, NULL);
+
+	default:
+		return SPDK_SCSI_TASK_UNKNOWN;
+	}
+
+	return SPDK_SCSI_TASK_COMPLETE;
+}
+
+static void
+bdev_scsi_process_block_resubmit(void *arg)
+{
+	struct spdk_scsi_task *task = arg;
+
+	bdev_scsi_process_block(task);
+}
+
+static int
+bdev_scsi_check_len(struct spdk_scsi_task *task, int len, int min_len)
+{
+	if (len >= min_len) {
+		return 0;
+	}
+
+	/* INVALID FIELD IN CDB */
+	spdk_scsi_task_set_status(task, SPDK_SCSI_STATUS_CHECK_CONDITION,
+				  SPDK_SCSI_SENSE_ILLEGAL_REQUEST,
+				  SPDK_SCSI_ASC_INVALID_FIELD_IN_CDB,
+				  SPDK_SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
+	return -1;
+}
+
+static int
+bdev_scsi_process_primary(struct spdk_scsi_task *task)
+{
+	struct spdk_scsi_lun *lun = task->lun;
+	struct spdk_bdev *bdev = lun->bdev;
+	int alloc_len = -1;
+	int data_len = -1;
+	uint8_t *cdb = task->cdb;
+	uint8_t *data = NULL;
+	int rc = 0;
+	int pllen, md = 0;
+	int llba;
+	int dbd, pc, page, subpage;
+	int cmd_parsed = 0;
+
+	switch (cdb[0]) {
+	case SPDK_SPC_INQUIRY:
+		alloc_len = from_be16(&cdb[3]);
+		data_len = spdk_max(4096, alloc_len);
+		data = calloc(1, data_len);
+		assert(data != NULL);
+		rc = bdev_scsi_inquiry(bdev, task, cdb, data, data_len);
+		data_len = spdk_min(rc, data_len);
+		if (rc < 0) {
+			break;
+		}
+
+		SPDK_LOGDUMP(SPDK_LOG_SCSI, "INQUIRY", data, data_len);
+		break;
+
+	case SPDK_SPC_REPORT_LUNS: {
+		int sel;
+
+		sel = cdb[2];
+		SPDK_DEBUGLOG(SPDK_LOG_SCSI, "sel=%x\n", sel);
+
+		alloc_len = from_be32(&cdb[6]);
+		rc = bdev_scsi_check_len(task, alloc_len, 16);
+		if (rc < 0) {
+			break;
+		}
+
+		data_len = spdk_max(4096, alloc_len);
+		data = calloc(1, data_len);
+		assert(data != NULL);
+		rc = bdev_scsi_report_luns(task->lun, sel, data, data_len);
+		data_len = rc;
+		if (rc < 0) {
+			spdk_scsi_task_set_status(task, SPDK_SCSI_STATUS_CHECK_CONDITION,
+						  SPDK_SCSI_SENSE_NO_SENSE,
+						  SPDK_SCSI_ASC_NO_ADDITIONAL_SENSE,
+						  SPDK_SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
+			break;
+		}
+
+		SPDK_LOGDUMP(SPDK_LOG_SCSI, "REPORT LUNS", data, data_len);
+		break;
+	}
+
+	case SPDK_SPC_MODE_SELECT_6:
+	case SPDK_SPC_MODE_SELECT_10:
+		if (cdb[0] == SPDK_SPC_MODE_SELECT_6) {
+			/* MODE_SELECT(6) must have at least a 4 byte header. */
+			md = 4;
+			pllen = cdb[4];
+		} else {
+			/* MODE_SELECT(10) must have at least an 8 byte header. */
+			md = 8;
+			pllen = from_be16(&cdb[7]);
+		}
+
+		if (pllen == 0) {
+			break;
+		}
+
+		rc = bdev_scsi_check_len(task, pllen, md);
+		if (rc < 0) {
+			break;
+		}
+
+		data = spdk_scsi_task_gather_data(task, &rc);
+		if (rc < 0) {
+			break;
+		}
+		data_len = rc;
+
+		rc = bdev_scsi_check_len(task, data_len, spdk_max(pllen, md));
+		if (rc < 0) {
+			break;
+		}
+
+		rc = pllen;
+		data_len = 0;
+		break;
+
+	case SPDK_SPC_MODE_SENSE_6:
+		alloc_len = cdb[4];
+		md = 6;
+	/* FALLTHROUGH */
+	case SPDK_SPC_MODE_SENSE_10:
+		llba = 0;
+
+		if (md == 0) {
+			alloc_len = from_be16(&cdb[7]);
+			llba = !!(cdb[1] & 0x10);
+			md = 10;
+		}
+
+		dbd = !!(cdb[1] & 0x8);
+		pc = (cdb[2] & 0xc0) >> 6;
+		page = cdb[2] & 0x3f;
+		subpage = cdb[3];
+
+		/* First call with no buffer to discover needed buffer size */
+		rc = bdev_scsi_mode_sense(bdev, md,
+					  cdb, dbd, llba, pc,
+					  page, subpage,
+					  NULL, task);
+		if (rc < 0) {
+			break;
+		}
+
+		data_len = rc;
+		data = calloc(1, data_len);
+		assert(data != NULL);
+
+		/* First call with no buffer to discover needed buffer size */
+		rc = bdev_scsi_mode_sense(bdev, md,
+					  cdb, dbd, llba, pc,
+					  page, subpage,
+					  data, task);
+		if (rc < 0) {
+			/* INVALID FIELD IN CDB */
+			spdk_scsi_task_set_status(task, SPDK_SCSI_STATUS_CHECK_CONDITION,
+						  SPDK_SCSI_SENSE_ILLEGAL_REQUEST,
+						  SPDK_SCSI_ASC_INVALID_FIELD_IN_CDB,
+						  SPDK_SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
+			break;
+		}
+		break;
+
+	case SPDK_SPC_REQUEST_SENSE: {
+		int desc;
+		int sk, asc, ascq;
+
+		desc = cdb[1] & 0x1;
+		if (desc != 0) {
+			/* INVALID FIELD IN CDB */
+			spdk_scsi_task_set_status(task, SPDK_SCSI_STATUS_CHECK_CONDITION,
+						  SPDK_SCSI_SENSE_ILLEGAL_REQUEST,
+						  SPDK_SCSI_ASC_INVALID_FIELD_IN_CDB,
+						  SPDK_SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
+			break;
+		}
+
+		alloc_len = cdb[4];
+
+		/* NO ADDITIONAL SENSE INFORMATION */
+		sk = SPDK_SCSI_SENSE_NO_SENSE;
+		asc = 0x00;
+		ascq = 0x00;
+
+		spdk_scsi_task_build_sense_data(task, sk, asc, ascq);
+
+		data_len = task->sense_data_len;
+		data = calloc(1, data_len);
+		assert(data != NULL);
+		memcpy(data, task->sense_data, data_len);
+		break;
+	}
+
+	case SPDK_SPC_LOG_SELECT:
+		SPDK_DEBUGLOG(SPDK_LOG_SCSI, "LOG_SELECT\n");
+		cmd_parsed = 1;
+	/* FALLTHROUGH */
+	case SPDK_SPC_LOG_SENSE:
+		if (!cmd_parsed) {
+			SPDK_DEBUGLOG(SPDK_LOG_SCSI, "LOG_SENSE\n");
+		}
+
+		/* INVALID COMMAND OPERATION CODE */
+		spdk_scsi_task_set_status(task, SPDK_SCSI_STATUS_CHECK_CONDITION,
+					  SPDK_SCSI_SENSE_ILLEGAL_REQUEST,
+					  SPDK_SCSI_ASC_INVALID_COMMAND_OPERATION_CODE,
+					  SPDK_SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
+		rc = -1;
+		break;
+
+	case SPDK_SPC_TEST_UNIT_READY:
+		SPDK_DEBUGLOG(SPDK_LOG_SCSI, "TEST_UNIT_READY\n");
+		cmd_parsed = 1;
+	/* FALLTHROUGH */
+	case SPDK_SBC_START_STOP_UNIT:
+		if (!cmd_parsed) {
+			SPDK_DEBUGLOG(SPDK_LOG_SCSI, "START_STOP_UNIT\n");
+		}
+
+		rc = 0;
+		break;
+
+	case SPDK_SPC_PERSISTENT_RESERVE_OUT:
+		pllen = from_be32(&cdb[5]);
+		rc = bdev_scsi_check_len(task, pllen, 24);
+		if (rc < 0) {
+			break;
+		}
+
+		data = spdk_scsi_task_gather_data(task, &rc);
+		if (rc < 0) {
+			break;
+		}
+		data_len = rc;
+		if (data_len < 24) {
+			rc = -1;
+			break;
+		}
+
+		rc = scsi_pr_out(task, cdb, data, data_len);
+		if (rc < 0) {
+			break;
+		}
+		rc = pllen;
+		data_len = 0;
+		break;
+
+	case SPDK_SPC_PERSISTENT_RESERVE_IN:
+		alloc_len = from_be16(&cdb[7]);
+		data_len = alloc_len;
+		data = calloc(1, data_len);
+		assert(data != NULL);
+		rc = scsi_pr_in(task, cdb, data, data_len);
+		break;
+
+	case SPDK_SPC2_RESERVE_6:
+	case SPDK_SPC2_RESERVE_10:
+		rc = scsi2_reserve(task, cdb);
+		if (rc == 0) {
+			if (cdb[0] == SPDK_SPC2_RESERVE_10) {
+				rc = from_be16(&cdb[7]);
+			}
+			data_len = 0;
+		}
+		break;
+
+	case SPDK_SPC2_RELEASE_6:
+	case SPDK_SPC2_RELEASE_10:
+		rc = scsi2_release(task);
+		break;
+
+	default:
+		return SPDK_SCSI_TASK_UNKNOWN;
+	}
+
+	if (rc >= 0 && data_len > 0) {
+		assert(alloc_len >= 0);
+		spdk_scsi_task_scatter_data(task, data, spdk_min(alloc_len, data_len));
+		rc = spdk_min(data_len, alloc_len);
+	}
+
+	if (rc >= 0) {
+		task->data_transferred = rc;
+		task->status = SPDK_SCSI_STATUS_GOOD;
+	}
+
+	if (data) {
+		free(data);
+	}
+
+	return SPDK_SCSI_TASK_COMPLETE;
+}
+
+int
+bdev_scsi_execute(struct spdk_scsi_task *task)
+{
+	int rc;
+
+	if ((rc = bdev_scsi_process_block(task)) == SPDK_SCSI_TASK_UNKNOWN) {
+		if ((rc = bdev_scsi_process_primary(task)) == SPDK_SCSI_TASK_UNKNOWN) {
+			SPDK_DEBUGLOG(SPDK_LOG_SCSI, "unsupported SCSI OP=0x%x\n", task->cdb[0]);
+			/* INVALID COMMAND OPERATION CODE */
+			spdk_scsi_task_set_status(task, SPDK_SCSI_STATUS_CHECK_CONDITION,
+						  SPDK_SCSI_SENSE_ILLEGAL_REQUEST,
+						  SPDK_SCSI_ASC_INVALID_COMMAND_OPERATION_CODE,
+						  SPDK_SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
+			return SPDK_SCSI_TASK_COMPLETE;
+		}
+	}
+
+	return rc;
+}
+
+static void
+bdev_scsi_reset_resubmit(void *arg)
+{
+	struct spdk_scsi_task *task = arg;
+
+	bdev_scsi_reset(task);
+}
+
+void
+bdev_scsi_reset(struct spdk_scsi_task *task)
+{
+	struct spdk_scsi_lun *lun = task->lun;
+	int rc;
+
+	rc = spdk_bdev_reset(lun->bdev_desc, lun->io_channel, bdev_scsi_task_complete_reset,
+			     task);
+	if (rc == -ENOMEM) {
+		bdev_scsi_queue_io(task, bdev_scsi_reset_resubmit, task);
+	}
+}
+
+bool
+bdev_scsi_get_dif_ctx(struct spdk_bdev *bdev, struct spdk_scsi_task *task,
+		      struct spdk_dif_ctx *dif_ctx)
+{
+	uint32_t ref_tag = 0, dif_check_flags = 0, data_offset;
+	uint8_t *cdb;
+	int rc;
+
+	if (spdk_likely(spdk_bdev_get_md_size(bdev) == 0)) {
+		return false;
+	}
+
+	cdb = task->cdb;
+	data_offset = task->offset;
+
+	/* We use lower 32 bits of LBA as Reference. Tag */
+	switch (cdb[0]) {
+	case SPDK_SBC_READ_6:
+	case SPDK_SBC_WRITE_6:
+		ref_tag = (uint32_t)cdb[1] << 16;
+		ref_tag |= (uint32_t)cdb[2] << 8;
+		ref_tag |= (uint32_t)cdb[3];
+		break;
+	case SPDK_SBC_READ_10:
+	case SPDK_SBC_WRITE_10:
+	case SPDK_SBC_READ_12:
+	case SPDK_SBC_WRITE_12:
+		ref_tag = from_be32(&cdb[2]);
+		break;
+	case SPDK_SBC_READ_16:
+	case SPDK_SBC_WRITE_16:
+		ref_tag = (uint32_t)from_be64(&cdb[2]);
+		break;
+	default:
+		return false;
+	}
+
+	if (spdk_bdev_is_dif_check_enabled(bdev, SPDK_DIF_CHECK_TYPE_REFTAG)) {
+		dif_check_flags |= SPDK_DIF_FLAGS_REFTAG_CHECK;
+	}
+
+	if (spdk_bdev_is_dif_check_enabled(bdev, SPDK_DIF_CHECK_TYPE_GUARD)) {
+		dif_check_flags |= SPDK_DIF_FLAGS_GUARD_CHECK;
+	}
+
+	rc = spdk_dif_ctx_init(dif_ctx,
+			       spdk_bdev_get_block_size(bdev),
+			       spdk_bdev_get_md_size(bdev),
+			       spdk_bdev_is_md_interleaved(bdev),
+			       spdk_bdev_is_dif_head_of_md(bdev),
+			       spdk_bdev_get_dif_type(bdev),
+			       dif_check_flags,
+			       ref_tag, 0, 0, data_offset, 0);
+
+	return (rc == 0) ? true : false;
+}