target: move code for CDB emulation

Move the existing code in target_core_cdb.c into the files for the command
sets that the emulations implement.

(roland + nab: Squash patch: Fix range calculation in WRITE SAME emulation
when num blocks == 0s)

Signed-off-by: Christoph Hellwig <[e-mail]>
Signed-off-by: Nicholas Bellinger <[e-mail]>

drivers/target/Makefile

···
 				   target_core_tmr.o \
 				   target_core_tpg.o \
 				   target_core_transport.o \
-				   target_core_cdb.o \
 				   target_core_sbc.o \
 				   target_core_spc.o \
 				   target_core_ua.o \

drivers/target/target_core_cdb.c

···
-/*
- * CDB emulation for non-READ/WRITE commands.
- *
- * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
- * Copyright (c) 2005, 2006, 2007 SBE, Inc.
- * Copyright (c) 2007-2010 Rising Tide Systems
- * Copyright (c) 2008-2010 Linux-iSCSI.org
- *
- * Nicholas A. Bellinger <[e-mail]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <asm/unaligned.h>
-#include <scsi/scsi.h>
-
-#include <target/target_core_base.h>
-#include <target/target_core_backend.h>
-#include <target/target_core_fabric.h>
-
-#include "target_core_internal.h"
-#include "target_core_ua.h"
-
-static void
-target_fill_alua_data(struct se_port *port, unsigned char *buf)
-{
-	struct t10_alua_tg_pt_gp *tg_pt_gp;
-	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
-
-	/*
-	 * Set SCCS for MAINTENANCE_IN + REPORT_TARGET_PORT_GROUPS.
-	 */
-	buf[5]	= 0x80;
-
-	/*
-	 * Set TPGS field for explict and/or implict ALUA access type
-	 * and opteration.
-	 *
-	 * See spc4r17 section 6.4.2 Table 135
-	 */
-	if (!port)
-		return;
-	tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
-	if (!tg_pt_gp_mem)
-		return;
-
-	spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
-	tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
-	if (tg_pt_gp)
-		buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type;
-	spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
-}
-
-static int
-target_emulate_inquiry_std(struct se_cmd *cmd, char *buf)
-{
-	struct se_lun *lun = cmd->se_lun;
-	struct se_device *dev = cmd->se_dev;
-
-	/* Set RMB (removable media) for tape devices */
-	if (dev->transport->get_device_type(dev) == TYPE_TAPE)
-		buf[1] = 0x80;
-
-	buf[2] = dev->transport->get_device_rev(dev);
-
-	/*
-	 * NORMACA and HISUP = 0, RESPONSE DATA FORMAT = 2
-	 *
-	 * SPC4 says:
-	 *   A RESPONSE DATA FORMAT field set to 2h indicates that the
-	 *   standard INQUIRY data is in the format defined in this
-	 *   standard. Response data format values less than 2h are
-	 *   obsolete. Response data format values greater than 2h are
-	 *   reserved.
-	 */
-	buf[3] = 2;
-
-	/*
-	 * Enable SCCS and TPGS fields for Emulated ALUA
-	 */
-	if (dev->se_sub_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED)
-		target_fill_alua_data(lun->lun_sep, buf);
-
-	buf[7] = 0x2; /* CmdQue=1 */
-
-	snprintf(&buf[8], 8, "LIO-ORG");
-	snprintf(&buf[16], 16, "%s", dev->se_sub_dev->t10_wwn.model);
-	snprintf(&buf[32], 4, "%s", dev->se_sub_dev->t10_wwn.revision);
-	buf[4] = 31; /* Set additional length to 31 */
-
-	return 0;
-}
-
-/* unit serial number */
-static int
-target_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf)
-{
-	struct se_device *dev = cmd->se_dev;
-	u16 len = 0;
-
-	if (dev->se_sub_dev->su_dev_flags &
-			SDF_EMULATED_VPD_UNIT_SERIAL) {
-		u32 unit_serial_len;
-
-		unit_serial_len = strlen(dev->se_sub_dev->t10_wwn.unit_serial);
-		unit_serial_len++; /* For NULL Terminator */
-
-		len += sprintf(&buf[4], "%s",
-			dev->se_sub_dev->t10_wwn.unit_serial);
-		len++; /* Extra Byte for NULL Terminator */
-		buf[3] = len;
-	}
-	return 0;
-}
-
-static void
-target_parse_naa_6h_vendor_specific(struct se_device *dev, unsigned char *buf)
-{
-	unsigned char *p = &dev->se_sub_dev->t10_wwn.unit_serial[0];
-	int cnt;
-	bool next = true;
-
-	/*
-	 * Generate up to 36 bits of VENDOR SPECIFIC IDENTIFIER starting on
-	 * byte 3 bit 3-0 for NAA IEEE Registered Extended DESIGNATOR field
-	 * format, followed by 64 bits of VENDOR SPECIFIC IDENTIFIER EXTENSION
-	 * to complete the payload.  These are based from VPD=0x80 PRODUCT SERIAL
-	 * NUMBER set via vpd_unit_serial in target_core_configfs.c to ensure
-	 * per device uniqeness.
-	 */
-	for (cnt = 0; *p && cnt < 13; p++) {
-		int val = hex_to_bin(*p);
-
-		if (val < 0)
-			continue;
-
-		if (next) {
-			next = false;
-			buf[cnt++] |= val;
-		} else {
-			next = true;
-			buf[cnt] = val << 4;
-		}
-	}
-}
-
-/*
- * Device identification VPD, for a complete list of
- * DESIGNATOR TYPEs see spc4r17 Table 459.
- */
-static int
-target_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf)
-{
-	struct se_device *dev = cmd->se_dev;
-	struct se_lun *lun = cmd->se_lun;
-	struct se_port *port = NULL;
-	struct se_portal_group *tpg = NULL;
-	struct t10_alua_lu_gp_member *lu_gp_mem;
-	struct t10_alua_tg_pt_gp *tg_pt_gp;
-	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
-	unsigned char *prod = &dev->se_sub_dev->t10_wwn.model[0];
-	u32 prod_len;
-	u32 unit_serial_len, off = 0;
-	u16 len = 0, id_len;
-
-	off = 4;
-
-	/*
-	 * NAA IEEE Registered Extended Assigned designator format, see
-	 * spc4r17 section 7.7.3.6.5
-	 *
-	 * We depend upon a target_core_mod/ConfigFS provided
-	 * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial
-	 * value in order to return the NAA id.
-	 */
-	if (!(dev->se_sub_dev->su_dev_flags & SDF_EMULATED_VPD_UNIT_SERIAL))
-		goto check_t10_vend_desc;
-
-	/* CODE SET == Binary */
-	buf[off++] = 0x1;
-
-	/* Set ASSOCIATION == addressed logical unit: 0)b */
-	buf[off] = 0x00;
-
-	/* Identifier/Designator type == NAA identifier */
-	buf[off++] |= 0x3;
-	off++;
-
-	/* Identifier/Designator length */
-	buf[off++] = 0x10;
-
-	/*
-	 * Start NAA IEEE Registered Extended Identifier/Designator
-	 */
-	buf[off++] = (0x6 << 4);
-
-	/*
-	 * Use OpenFabrics IEEE Company ID: 00 14 05
-	 */
-	buf[off++] = 0x01;
-	buf[off++] = 0x40;
-	buf[off] = (0x5 << 4);
-
-	/*
-	 * Return ConfigFS Unit Serial Number information for
-	 * VENDOR_SPECIFIC_IDENTIFIER and
-	 * VENDOR_SPECIFIC_IDENTIFIER_EXTENTION
-	 */
-	target_parse_naa_6h_vendor_specific(dev, &buf[off]);
-
-	len = 20;
-	off = (len + 4);
-
-check_t10_vend_desc:
-	/*
-	 * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4
-	 */
-	id_len = 8; /* For Vendor field */
-	prod_len = 4; /* For VPD Header */
-	prod_len += 8; /* For Vendor field */
-	prod_len += strlen(prod);
-	prod_len++; /* For : */
-
-	if (dev->se_sub_dev->su_dev_flags &
-			SDF_EMULATED_VPD_UNIT_SERIAL) {
-		unit_serial_len =
-			strlen(&dev->se_sub_dev->t10_wwn.unit_serial[0]);
-		unit_serial_len++; /* For NULL Terminator */
-
-		id_len += sprintf(&buf[off+12], "%s:%s", prod,
-				&dev->se_sub_dev->t10_wwn.unit_serial[0]);
-	}
-	buf[off] = 0x2; /* ASCII */
-	buf[off+1] = 0x1; /* T10 Vendor ID */
-	buf[off+2] = 0x0;
-	memcpy(&buf[off+4], "LIO-ORG", 8);
-	/* Extra Byte for NULL Terminator */
-	id_len++;
-	/* Identifier Length */
-	buf[off+3] = id_len;
-	/* Header size for Designation descriptor */
-	len += (id_len + 4);
-	off += (id_len + 4);
-	/*
-	 * struct se_port is only set for INQUIRY VPD=1 through $FABRIC_MOD
-	 */
-	port = lun->lun_sep;
-	if (port) {
-		struct t10_alua_lu_gp *lu_gp;
-		u32 padding, scsi_name_len;
-		u16 lu_gp_id = 0;
-		u16 tg_pt_gp_id = 0;
-		u16 tpgt;
-
-		tpg = port->sep_tpg;
-		/*
-		 * Relative target port identifer, see spc4r17
-		 * section 7.7.3.7
-		 *
-		 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
-		 * section 7.5.1 Table 362
-		 */
-		buf[off] =
-			(tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
-		buf[off++] |= 0x1; /* CODE SET == Binary */
-		buf[off] = 0x80; /* Set PIV=1 */
-		/* Set ASSOCIATION == target port: 01b */
-		buf[off] |= 0x10;
-		/* DESIGNATOR TYPE == Relative target port identifer */
-		buf[off++] |= 0x4;
-		off++; /* Skip over Reserved */
-		buf[off++] = 4; /* DESIGNATOR LENGTH */
-		/* Skip over Obsolete field in RTPI payload
-		 * in Table 472 */
-		off += 2;
-		buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
-		buf[off++] = (port->sep_rtpi & 0xff);
-		len += 8; /* Header size + Designation descriptor */
-		/*
-		 * Target port group identifier, see spc4r17
-		 * section 7.7.3.8
-		 *
-		 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
-		 * section 7.5.1 Table 362
-		 */
-		if (dev->se_sub_dev->t10_alua.alua_type !=
-				SPC3_ALUA_EMULATED)
-			goto check_scsi_name;
-
-		tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
-		if (!tg_pt_gp_mem)
-			goto check_lu_gp;
-
-		spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
-		tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
-		if (!tg_pt_gp) {
-			spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
-			goto check_lu_gp;
-		}
-		tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id;
-		spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
-
-		buf[off] =
-			(tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
-		buf[off++] |= 0x1; /* CODE SET == Binary */
-		buf[off] = 0x80; /* Set PIV=1 */
-		/* Set ASSOCIATION == target port: 01b */
-		buf[off] |= 0x10;
-		/* DESIGNATOR TYPE == Target port group identifier */
-		buf[off++] |= 0x5;
-		off++; /* Skip over Reserved */
-		buf[off++] = 4; /* DESIGNATOR LENGTH */
-		off += 2; /* Skip over Reserved Field */
-		buf[off++] = ((tg_pt_gp_id >> 8) & 0xff);
-		buf[off++] = (tg_pt_gp_id & 0xff);
-		len += 8; /* Header size + Designation descriptor */
-		/*
-		 * Logical Unit Group identifier, see spc4r17
-		 * section 7.7.3.8
-		 */
-check_lu_gp:
-		lu_gp_mem = dev->dev_alua_lu_gp_mem;
-		if (!lu_gp_mem)
-			goto check_scsi_name;
-
-		spin_lock(&lu_gp_mem->lu_gp_mem_lock);
-		lu_gp = lu_gp_mem->lu_gp;
-		if (!lu_gp) {
-			spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
-			goto check_scsi_name;
-		}
-		lu_gp_id = lu_gp->lu_gp_id;
-		spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
-
-		buf[off++] |= 0x1; /* CODE SET == Binary */
-		/* DESIGNATOR TYPE == Logical Unit Group identifier */
-		buf[off++] |= 0x6;
-		off++; /* Skip over Reserved */
-		buf[off++] = 4; /* DESIGNATOR LENGTH */
-		off += 2; /* Skip over Reserved Field */
-		buf[off++] = ((lu_gp_id >> 8) & 0xff);
-		buf[off++] = (lu_gp_id & 0xff);
-		len += 8; /* Header size + Designation descriptor */
-		/*
-		 * SCSI name string designator, see spc4r17
-		 * section 7.7.3.11
-		 *
-		 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
-		 * section 7.5.1 Table 362
-		 */
-check_scsi_name:
-		scsi_name_len = strlen(tpg->se_tpg_tfo->tpg_get_wwn(tpg));
-		/* UTF-8 ",t,0x<16-bit TPGT>" + NULL Terminator */
-		scsi_name_len += 10;
-		/* Check for 4-byte padding */
-		padding = ((-scsi_name_len) & 3);
-		if (padding != 0)
-			scsi_name_len += padding;
-		/* Header size + Designation descriptor */
-		scsi_name_len += 4;
-
-		buf[off] =
-			(tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
-		buf[off++] |= 0x3; /* CODE SET == UTF-8 */
-		buf[off] = 0x80; /* Set PIV=1 */
-		/* Set ASSOCIATION == target port: 01b */
-		buf[off] |= 0x10;
-		/* DESIGNATOR TYPE == SCSI name string */
-		buf[off++] |= 0x8;
-		off += 2; /* Skip over Reserved and length */
-		/*
-		 * SCSI name string identifer containing, $FABRIC_MOD
-		 * dependent information.  For LIO-Target and iSCSI
-		 * Target Port, this means "<iSCSI name>,t,0x<TPGT> in
-		 * UTF-8 encoding.
-		 */
-		tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
-		scsi_name_len = sprintf(&buf[off], "%s,t,0x%04x",
-					tpg->se_tpg_tfo->tpg_get_wwn(tpg), tpgt);
-		scsi_name_len += 1 /* Include  NULL terminator */;
-		/*
-		 * The null-terminated, null-padded (see 4.4.2) SCSI
-		 * NAME STRING field contains a UTF-8 format string.
-		 * The number of bytes in the SCSI NAME STRING field
-		 * (i.e., the value in the DESIGNATOR LENGTH field)
-		 * shall be no larger than 256 and shall be a multiple
-		 * of four.
-		 */
-		if (padding)
-			scsi_name_len += padding;
-
-		buf[off-1] = scsi_name_len;
-		off += scsi_name_len;
-		/* Header size + Designation descriptor */
-		len += (scsi_name_len + 4);
-	}
-	buf[2] = ((len >> 8) & 0xff);
-	buf[3] = (len & 0xff); /* Page Length for VPD 0x83 */
-	return 0;
-}
-
-/* Extended INQUIRY Data VPD Page */
-static int
-target_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf)
-{
-	buf[3] = 0x3c;
-	/* Set HEADSUP, ORDSUP, SIMPSUP */
-	buf[5] = 0x07;
-
-	/* If WriteCache emulation is enabled, set V_SUP */
-	if (cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0)
-		buf[6] = 0x01;
-	return 0;
-}
-
-/* Block Limits VPD page */
-static int
-target_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
-{
-	struct se_device *dev = cmd->se_dev;
-	u32 max_sectors;
-	int have_tp = 0;
-
-	/*
-	 * Following sbc3r22 section 6.5.3 Block Limits VPD page, when
-	 * emulate_tpu=1 or emulate_tpws=1 we will be expect a
-	 * different page length for Thin Provisioning.
-	 */
-	if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
-		have_tp = 1;
-
-	buf[0] = dev->transport->get_device_type(dev);
-	buf[3] = have_tp ? 0x3c : 0x10;
-
-	/* Set WSNZ to 1 */
-	buf[4] = 0x01;
-
-	/*
-	 * Set OPTIMAL TRANSFER LENGTH GRANULARITY
-	 */
-	put_unaligned_be16(1, &buf[6]);
-
-	/*
-	 * Set MAXIMUM TRANSFER LENGTH
-	 */
-	max_sectors = min(dev->se_sub_dev->se_dev_attrib.fabric_max_sectors,
-			  dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
-	put_unaligned_be32(max_sectors, &buf[8]);
-
-	/*
-	 * Set OPTIMAL TRANSFER LENGTH
-	 */
-	put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.optimal_sectors, &buf[12]);
-
-	/*
-	 * Exit now if we don't support TP.
-	 */
-	if (!have_tp)
-		return 0;
-
-	/*
-	 * Set MAXIMUM UNMAP LBA COUNT
-	 */
-	put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count, &buf[20]);
-
-	/*
-	 * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT
-	 */
-	put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count,
-			   &buf[24]);
-
-	/*
-	 * Set OPTIMAL UNMAP GRANULARITY
-	 */
-	put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.unmap_granularity, &buf[28]);
-
-	/*
-	 * UNMAP GRANULARITY ALIGNMENT
-	 */
-	put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment,
-			   &buf[32]);
-	if (dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment != 0)
-		buf[32] |= 0x80; /* Set the UGAVALID bit */
-
-	return 0;
-}
-
-/* Block Device Characteristics VPD page */
-static int
-target_emulate_evpd_b1(struct se_cmd *cmd, unsigned char *buf)
-{
-	struct se_device *dev = cmd->se_dev;
-
-	buf[0] = dev->transport->get_device_type(dev);
-	buf[3] = 0x3c;
-	buf[5] = dev->se_sub_dev->se_dev_attrib.is_nonrot ? 1 : 0;
-
-	return 0;
-}
-
-/* Thin Provisioning VPD */
-static int
-target_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf)
-{
-	struct se_device *dev = cmd->se_dev;
-
-	/*
-	 * From sbc3r22 section 6.5.4 Thin Provisioning VPD page:
-	 *
-	 * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to
-	 * zero, then the page length shall be set to 0004h.  If the DP bit
-	 * is set to one, then the page length shall be set to the value
-	 * defined in table 162.
-	 */
-	buf[0] = dev->transport->get_device_type(dev);
-
-	/*
-	 * Set Hardcoded length mentioned above for DP=0
-	 */
-	put_unaligned_be16(0x0004, &buf[2]);
-
-	/*
-	 * The THRESHOLD EXPONENT field indicates the threshold set size in
-	 * LBAs as a power of 2 (i.e., the threshold set size is equal to
-	 * 2(threshold exponent)).
-	 *
-	 * Note that this is currently set to 0x00 as mkp says it will be
-	 * changing again.  We can enable this once it has settled in T10
-	 * and is actually used by Linux/SCSI ML code.
-	 */
-	buf[4] = 0x00;
-
-	/*
-	 * A TPU bit set to one indicates that the device server supports
-	 * the UNMAP command (see 5.25). A TPU bit set to zero indicates
-	 * that the device server does not support the UNMAP command.
-	 */
-	if (dev->se_sub_dev->se_dev_attrib.emulate_tpu != 0)
-		buf[5] = 0x80;
-
-	/*
-	 * A TPWS bit set to one indicates that the device server supports
-	 * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs.
-	 * A TPWS bit set to zero indicates that the device server does not
-	 * support the use of the WRITE SAME (16) command to unmap LBAs.
-	 */
-	if (dev->se_sub_dev->se_dev_attrib.emulate_tpws != 0)
-		buf[5] |= 0x40;
-
-	return 0;
-}
-
-static int
-target_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf);
-
-static struct {
-	uint8_t		page;
-	int		(*emulate)(struct se_cmd *, unsigned char *);
-} evpd_handlers[] = {
-	{ .page = 0x00, .emulate = target_emulate_evpd_00 },
-	{ .page = 0x80, .emulate = target_emulate_evpd_80 },
-	{ .page = 0x83, .emulate = target_emulate_evpd_83 },
-	{ .page = 0x86, .emulate = target_emulate_evpd_86 },
-	{ .page = 0xb0, .emulate = target_emulate_evpd_b0 },
-	{ .page = 0xb1, .emulate = target_emulate_evpd_b1 },
-	{ .page = 0xb2, .emulate = target_emulate_evpd_b2 },
-};
-
-/* supported vital product data pages */
-static int
-target_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf)
-{
-	int p;
-
-	/*
-	 * Only report the INQUIRY EVPD=1 pages after a valid NAA
-	 * Registered Extended LUN WWN has been set via ConfigFS
-	 * during device creation/restart.
-	 */
-	if (cmd->se_dev->se_sub_dev->su_dev_flags &
-			SDF_EMULATED_VPD_UNIT_SERIAL) {
-		buf[3] = ARRAY_SIZE(evpd_handlers);
-		for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p)
-			buf[p + 4] = evpd_handlers[p].page;
-	}
-
-	return 0;
-}
-
-int target_emulate_inquiry(struct se_cmd *cmd)
-{
-	struct se_device *dev = cmd->se_dev;
-	struct se_portal_group *tpg = cmd->se_lun->lun_sep->sep_tpg;
-	unsigned char *buf, *map_buf;
-	unsigned char *cdb = cmd->t_task_cdb;
-	int p, ret;
-
-	map_buf = transport_kmap_data_sg(cmd);
-	/*
-	 * If SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC is not set, then we
-	 * know we actually allocated a full page.  Otherwise, if the
-	 * data buffer is too small, allocate a temporary buffer so we
-	 * don't have to worry about overruns in all our INQUIRY
-	 * emulation handling.
-	 */
-	if (cmd->data_length < SE_INQUIRY_BUF &&
-	    (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)) {
-		buf = kzalloc(SE_INQUIRY_BUF, GFP_KERNEL);
-		if (!buf) {
-			transport_kunmap_data_sg(cmd);
-			cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
-			return -ENOMEM;
-		}
-	} else {
-		buf = map_buf;
-	}
-
-	if (dev == tpg->tpg_virt_lun0.lun_se_dev)
-		buf[0] = 0x3f; /* Not connected */
-	else
-		buf[0] = dev->transport->get_device_type(dev);
-
-	if (!(cdb[1] & 0x1)) {
-		if (cdb[2]) {
-			pr_err("INQUIRY with EVPD==0 but PAGE CODE=%02x\n",
-			       cdb[2]);
-			cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
-			ret = -EINVAL;
-			goto out;
-		}
-
-		ret = target_emulate_inquiry_std(cmd, buf);
-		goto out;
-	}
-
-	for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) {
-		if (cdb[2] == evpd_handlers[p].page) {
-			buf[1] = cdb[2];
-			ret = evpd_handlers[p].emulate(cmd, buf);
-			goto out;
-		}
-	}
-
-	pr_err("Unknown VPD Code: 0x%02x\n", cdb[2]);
-	cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
-	ret = -EINVAL;
-
-out:
-	if (buf != map_buf) {
-		memcpy(map_buf, buf, cmd->data_length);
-		kfree(buf);
-	}
-	transport_kunmap_data_sg(cmd);
-
-	if (!ret)
-		target_complete_cmd(cmd, GOOD);
-	return ret;
-}
-
-int target_emulate_readcapacity(struct se_cmd *cmd)
-{
-	struct se_device *dev = cmd->se_dev;
-	unsigned char *buf;
-	unsigned long long blocks_long = dev->transport->get_blocks(dev);
-	u32 blocks;
-
-	if (blocks_long >= 0x00000000ffffffff)
-		blocks = 0xffffffff;
-	else
-		blocks = (u32)blocks_long;
-
-	buf = transport_kmap_data_sg(cmd);
-
-	buf[0] = (blocks >> 24) & 0xff;
-	buf[1] = (blocks >> 16) & 0xff;
-	buf[2] = (blocks >> 8) & 0xff;
-	buf[3] = blocks & 0xff;
-	buf[4] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff;
-	buf[5] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff;
-	buf[6] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff;
-	buf[7] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff;
-
-	transport_kunmap_data_sg(cmd);
-
-	target_complete_cmd(cmd, GOOD);
-	return 0;
-}
-
-int target_emulate_readcapacity_16(struct se_cmd *cmd)
-{
-	struct se_device *dev = cmd->se_dev;
-	unsigned char *buf;
-	unsigned long long blocks = dev->transport->get_blocks(dev);
-
-	buf = transport_kmap_data_sg(cmd);
-
-	buf[0] = (blocks >> 56) & 0xff;
-	buf[1] = (blocks >> 48) & 0xff;
-	buf[2] = (blocks >> 40) & 0xff;
-	buf[3] = (blocks >> 32) & 0xff;
-	buf[4] = (blocks >> 24) & 0xff;
-	buf[5] = (blocks >> 16) & 0xff;
-	buf[6] = (blocks >> 8) & 0xff;
-	buf[7] = blocks & 0xff;
-	buf[8] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff;
-	buf[9] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff;
-	buf[10] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff;
-	buf[11] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff;
-	/*
-	 * Set Thin Provisioning Enable bit following sbc3r22 in section
-	 * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
-	 */
-	if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
-		buf[14] = 0x80;
-
-	transport_kunmap_data_sg(cmd);
-
-	target_complete_cmd(cmd, GOOD);
-	return 0;
-}
-
-static int
-target_modesense_rwrecovery(unsigned char *p)
-{
-	p[0] = 0x01;
-	p[1] = 0x0a;
-
-	return 12;
-}
-
-static int
-target_modesense_control(struct se_device *dev, unsigned char *p)
-{
-	p[0] = 0x0a;
-	p[1] = 0x0a;
-	p[2] = 2;
-	/*
-	 * From spc4r23, 7.4.7 Control mode page
-	 *
-	 * The QUEUE ALGORITHM MODIFIER field (see table 368) specifies
-	 * restrictions on the algorithm used for reordering commands
-	 * having the SIMPLE task attribute (see SAM-4).
-	 *
-	 *                    Table 368 -- QUEUE ALGORITHM MODIFIER field
-	 *                         Code      Description
-	 *                          0h       Restricted reordering
-	 *                          1h       Unrestricted reordering allowed
-	 *                          2h to 7h    Reserved
-	 *                          8h to Fh    Vendor specific
-	 *
-	 * A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that
-	 * the device server shall order the processing sequence of commands
-	 * having the SIMPLE task attribute such that data integrity is maintained
-	 * for that I_T nexus (i.e., if the transmission of new SCSI transport protocol
-	 * requests is halted at any time, the final value of all data observable
-	 * on the medium shall be the same as if all the commands had been processed
-	 * with the ORDERED task attribute).
-	 *
-	 * A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the
-	 * device server may reorder the processing sequence of commands having the
-	 * SIMPLE task attribute in any manner. Any data integrity exposures related to
-	 * command sequence order shall be explicitly handled by the application client
-	 * through the selection of appropriate ommands and task attributes.
-	 */
-	p[3] = (dev->se_sub_dev->se_dev_attrib.emulate_rest_reord == 1) ? 0x00 : 0x10;
-	/*
-	 * From spc4r17, section 7.4.6 Control mode Page
-	 *
-	 * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b
-	 *
-	 * 00b: The logical unit shall clear any unit attention condition
-	 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
-	 * status and shall not establish a unit attention condition when a com-
-	 * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT
-	 * status.
-	 *
-	 * 10b: The logical unit shall not clear any unit attention condition
-	 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
-	 * status and shall not establish a unit attention condition when
-	 * a command is completed with BUSY, TASK SET FULL, or RESERVATION
-	 * CONFLICT status.
-	 *
-	 * 11b a The logical unit shall not clear any unit attention condition
-	 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
-	 * status and shall establish a unit attention condition for the
-	 * initiator port associated with the I_T nexus on which the BUSY,
-	 * TASK SET FULL, or RESERVATION CONFLICT status is being returned.
-	 * Depending on the status, the additional sense code shall be set to
-	 * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS
-	 * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE
-	 * command, a unit attention condition shall be established only once
-	 * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless
-	 * to the number of commands completed with one of those status codes.
-	 */
-	p[4] = (dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2) ? 0x30 :
-	       (dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 1) ? 0x20 : 0x00;
-	/*
-	 * From spc4r17, section 7.4.6 Control mode Page
-	 *
-	 * Task Aborted Status (TAS) bit set to zero.
-	 *
-	 * A task aborted status (TAS) bit set to zero specifies that aborted
-	 * tasks shall be terminated by the device server without any response
-	 * to the application client. A TAS bit set to one specifies that tasks
-	 * aborted by the actions of an I_T nexus other than the I_T nexus on
-	 * which the command was received shall be completed with TASK ABORTED
-	 * status (see SAM-4).
-	 */
-	p[5] = (dev->se_sub_dev->se_dev_attrib.emulate_tas) ? 0x40 : 0x00;
-	p[8] = 0xff;
-	p[9] = 0xff;
-	p[11] = 30;
-
-	return 12;
-}
-
-static int
-target_modesense_caching(struct se_device *dev, unsigned char *p)
-{
-	p[0] = 0x08;
-	p[1] = 0x12;
-	if (dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0)
-		p[2] = 0x04; /* Write Cache Enable */
-	p[12] = 0x20; /* Disabled Read Ahead */
-
-	return 20;
-}
-
-static void
-target_modesense_write_protect(unsigned char *buf, int type)
-{
-	/*
-	 * I believe that the WP bit (bit 7) in the mode header is the same for
-	 * all device types..
-	 */
-	switch (type) {
-	case TYPE_DISK:
-	case TYPE_TAPE:
-	default:
-		buf[0] |= 0x80; /* WP bit */
-		break;
-	}
-}
-
-static void
-target_modesense_dpofua(unsigned char *buf, int type)
-{
-	switch (type) {
-	case TYPE_DISK:
-		buf[0] |= 0x10; /* DPOFUA bit */
-		break;
-	default:
-		break;
-	}
-}
-
-int target_emulate_modesense(struct se_cmd *cmd)
-{
-	struct se_device *dev = cmd->se_dev;
-	char *cdb = cmd->t_task_cdb;
-	unsigned char *rbuf;
-	int type = dev->transport->get_device_type(dev);
-	int ten = (cmd->t_task_cdb[0] == MODE_SENSE_10);
-	int offset = ten ? 8 : 4;
-	int length = 0;
-	unsigned char buf[SE_MODE_PAGE_BUF];
-
-	memset(buf, 0, SE_MODE_PAGE_BUF);
-
-	switch (cdb[2] & 0x3f) {
-	case 0x01:
-		length = target_modesense_rwrecovery(&buf[offset]);
-		break;
-	case 0x08:
-		length = target_modesense_caching(dev, &buf[offset]);
-		break;
-	case 0x0a:
-		length = target_modesense_control(dev, &buf[offset]);
-		break;
-	case 0x3f:
-		length = target_modesense_rwrecovery(&buf[offset]);
-		length += target_modesense_caching(dev, &buf[offset+length]);
-		length += target_modesense_control(dev, &buf[offset+length]);
-		break;
-	default:
-		pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n",
-		       cdb[2] & 0x3f, cdb[3]);
-		cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
-		return -EINVAL;
-	}
-	offset += length;
-
-	if (ten) {
-		offset -= 2;
-		buf[0] = (offset >> 8) & 0xff;
-		buf[1] = offset & 0xff;
-
-		if ((cmd->se_lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) ||
-		    (cmd->se_deve &&
-		    (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)))
-			target_modesense_write_protect(&buf[3], type);
-
-		if ((dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0) &&
-		    (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0))
-			target_modesense_dpofua(&buf[3], type);
-
-		if ((offset + 2) > cmd->data_length)
-			offset = cmd->data_length;
-
-	} else {
-		offset -= 1;
-		buf[0] = offset & 0xff;
-
-		if ((cmd->se_lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) ||
-		    (cmd->se_deve &&
-		    (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)))
-			target_modesense_write_protect(&buf[2], type);
-
-		if ((dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0) &&
-		    (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0))
-			target_modesense_dpofua(&buf[2], type);
-
-		if ((offset + 1) > cmd->data_length)
-			offset = cmd->data_length;
-	}
-
-	rbuf = transport_kmap_data_sg(cmd);
-	memcpy(rbuf, buf, offset);
-	transport_kunmap_data_sg(cmd);
-
-	target_complete_cmd(cmd, GOOD);
-	return 0;
-}
-
-int target_emulate_request_sense(struct se_cmd *cmd)
-{
-	unsigned char *cdb = cmd->t_task_cdb;
-	unsigned char *buf;
-	u8 ua_asc = 0, ua_ascq = 0;
-	int err = 0;
-
-	if (cdb[1] & 0x01) {
-		pr_err("REQUEST_SENSE description emulation not"
-			" supported\n");
-		cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
-		return -ENOSYS;
-	}
-
-	buf = transport_kmap_data_sg(cmd);
-
-	if (!core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq)) {
-		/*
-		 * CURRENT ERROR, UNIT ATTENTION
-		 */
-		buf[0] = 0x70;
-		buf[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
-
-		if (cmd->data_length < 18) {
-			buf[7] = 0x00;
-			err = -EINVAL;
-			goto end;
-		}
-		/*
-		 * The Additional Sense Code (ASC) from the UNIT ATTENTION
-		 */
-		buf[SPC_ASC_KEY_OFFSET] = ua_asc;
-		buf[SPC_ASCQ_KEY_OFFSET] = ua_ascq;
-		buf[7] = 0x0A;
-	} else {
-		/*
-		 * CURRENT ERROR, NO SENSE
-		 */
-		buf[0] = 0x70;
-		buf[SPC_SENSE_KEY_OFFSET] = NO_SENSE;
-
-		if (cmd->data_length < 18) {
-			buf[7] = 0x00;
-			err = -EINVAL;
-			goto end;
-		}
-		/*
-		 * NO ADDITIONAL SENSE INFORMATION
-		 */
-		buf[SPC_ASC_KEY_OFFSET] = 0x00;
-		buf[7] = 0x0A;
-	}
-
-end:
-	transport_kunmap_data_sg(cmd);
-	target_complete_cmd(cmd, GOOD);
-	return 0;
-}
-
-/*
- * Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support.
- * Note this is not used for TCM/pSCSI passthrough
- */
-int target_emulate_unmap(struct se_cmd *cmd)
-{
-	struct se_device *dev = cmd->se_dev;
-	unsigned char *buf, *ptr = NULL;
-	unsigned char *cdb = &cmd->t_task_cdb[0];
-	sector_t lba;
-	unsigned int size = cmd->data_length, range;
-	int ret = 0, offset;
-	unsigned short dl, bd_dl;
-
-	if (!dev->transport->do_discard) {
-		pr_err("UNMAP emulation not supported for: %s\n",
-				dev->transport->name);
-		cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
-		return -ENOSYS;
-	}
-
-	/* First UNMAP block descriptor starts at 8 byte offset */
-	offset = 8;
-	size -= 8;
-	dl = get_unaligned_be16(&cdb[0]);
-	bd_dl = get_unaligned_be16(&cdb[2]);
-
-	buf = transport_kmap_data_sg(cmd);
-
-	ptr = &buf[offset];
-	pr_debug("UNMAP: Sub: %s Using dl: %hu bd_dl: %hu size: %hu"
-		" ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
-
-	while (size) {
-		lba = get_unaligned_be64(&ptr[0]);
-		range = get_unaligned_be32(&ptr[8]);
-		pr_debug("UNMAP: Using lba: %llu and range: %u\n",
-				 (unsigned long long)lba, range);
-
-		ret = dev->transport->do_discard(dev, lba, range);
-		if (ret < 0) {
-			pr_err("blkdev_issue_discard() failed: %d\n",
-					ret);
-			goto err;
-		}
-
-		ptr += 16;
-		size -= 16;
-	}
-
-err:
-	transport_kunmap_data_sg(cmd);
-	if (!ret)
-		target_complete_cmd(cmd, GOOD);
-	return ret;
-}
-
-/*
- * Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support.
- * Note this is not used for TCM/pSCSI passthrough
- */
-int target_emulate_write_same(struct se_cmd *cmd)
-{
-	struct se_device *dev = cmd->se_dev;
-	sector_t range;
-	sector_t lba = cmd->t_task_lba;
-	u32 num_blocks;
-	int ret;
-
-	if (!dev->transport->do_discard) {
-		pr_err("WRITE_SAME emulation not supported"
-				" for: %s\n", dev->transport->name);
-		cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
-		return -ENOSYS;
-	}
-
-	if (cmd->t_task_cdb[0] == WRITE_SAME)
-		num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]);
-	else if (cmd->t_task_cdb[0] == WRITE_SAME_16)
-		num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]);
-	else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */
-		num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]);
-
-	/*
-	 * Use the explicit range when non zero is supplied, otherwise calculate
-	 * the remaining range based on ->get_blocks() - starting LBA.
-	 */
-	if (num_blocks != 0)
-		range = num_blocks;
-	else
-		range = (dev->transport->get_blocks(dev) - lba) + 1;
-
-	pr_debug("WRITE_SAME UNMAP: LBA: %llu Range: %llu\n",
-		 (unsigned long long)lba, (unsigned long long)range);
-
-	ret = dev->transport->do_discard(dev, lba, range);
-	if (ret < 0) {
-		pr_debug("blkdev_issue_discard() failed for WRITE_SAME\n");
-		return ret;
-	}
-
-	target_complete_cmd(cmd, GOOD);
-	return 0;
-}
-
-int target_emulate_synchronize_cache(struct se_cmd *cmd)
-{
-	if (!cmd->se_dev->transport->do_sync_cache) {
-		pr_err("SYNCHRONIZE_CACHE emulation not supported"
-			" for: %s\n", cmd->se_dev->transport->name);
-		cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
-		return -ENOSYS;
-	}
-
-	cmd->se_dev->transport->do_sync_cache(cmd);
-	return 0;
-}
-
-int target_emulate_noop(struct se_cmd *cmd)
-{
-	target_complete_cmd(cmd, GOOD);
-	return 0;
-}

drivers/target/target_core_internal.h

···
 /* target_core_alua.c */
 extern struct t10_alua_lu_gp *default_lu_gp;
 
-/* target_core_cdb.c */
-int	target_emulate_inquiry(struct se_cmd *cmd);
-int	target_emulate_readcapacity(struct se_cmd *cmd);
-int	target_emulate_readcapacity_16(struct se_cmd *cmd);
-int	target_emulate_modesense(struct se_cmd *cmd);
-int	target_emulate_request_sense(struct se_cmd *cmd);
-int	target_emulate_unmap(struct se_cmd *cmd);
-int	target_emulate_write_same(struct se_cmd *cmd);
-int	target_emulate_synchronize_cache(struct se_cmd *cmd);
-int	target_emulate_noop(struct se_cmd *cmd);
-
 /* target_core_device.c */
 struct se_dev_entry *core_get_se_deve_from_rtpi(struct se_node_acl *, u16);
 int	core_free_device_list_for_node(struct se_node_acl *,
···
 bool	target_stop_cmd(struct se_cmd *cmd, unsigned long *flags);
 int	transport_clear_lun_from_sessions(struct se_lun *);
 void	transport_send_task_abort(struct se_cmd *);
+int	target_cmd_size_check(struct se_cmd *cmd, unsigned int size);
 
 /* target_core_stat.c */
 void	target_stat_setup_dev_default_groups(struct se_subsystem_dev *);

drivers/target/target_core_pscsi.c

···
 	return -ENOMEM;
 }
 
-static inline u32 pscsi_get_sectors_6(
-	unsigned char *cdb,
-	struct se_cmd *cmd,
-	int *ret)
+static int pscsi_parse_cdb(struct se_cmd *cmd)
 {
-	struct se_device *dev = cmd->se_dev;
-
-	/*
-	 * Assume TYPE_DISK for non struct se_device objects.
-	 * Use 8-bit sector value.
-	 */
-	if (!dev)
-		goto type_disk;
-
-	/*
-	 * Use 24-bit allocation length for TYPE_TAPE.
-	 */
-	if (dev->transport->get_device_type(dev) == TYPE_TAPE)
-		return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
-
-	/*
-	 * Everything else assume TYPE_DISK Sector CDB location.
-	 * Use 8-bit sector value.  SBC-3 says:
-	 *
-	 *   A TRANSFER LENGTH field set to zero specifies that 256
-	 *   logical blocks shall be written.  Any other value
-	 *   specifies the number of logical blocks that shall be
-	 *   written.
-	 */
-type_disk:
-	return cdb[4] ? : 256;
-}
-
-static inline u32 pscsi_get_sectors_10(
-	unsigned char *cdb,
-	struct se_cmd *cmd,
-	int *ret)
-{
-	struct se_device *dev = cmd->se_dev;
-
-	/*
-	 * Assume TYPE_DISK for non struct se_device objects.
-	 * Use 16-bit sector value.
-	 */
-	if (!dev)
-		goto type_disk;
-
-	/*
-	 * XXX_10 is not defined in SSC, throw an exception
-	 */
-	if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
-		*ret = -EINVAL;
-		return 0;
-	}
-
-	/*
-	 * Everything else assume TYPE_DISK Sector CDB location.
-	 * Use 16-bit sector value.
-	 */
-type_disk:
-	return (u32)(cdb[7] << 8) + cdb[8];
-}
-
-static inline u32 pscsi_get_sectors_12(
-	unsigned char *cdb,
-	struct se_cmd *cmd,
-	int *ret)
-{
-	struct se_device *dev = cmd->se_dev;
-
-	/*
-	 * Assume TYPE_DISK for non struct se_device objects.
-	 * Use 32-bit sector value.
-	 */
-	if (!dev)
-		goto type_disk;
-
-	/*
-	 * XXX_12 is not defined in SSC, throw an exception
-	 */
-	if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
-		*ret = -EINVAL;
-		return 0;
-	}
-
-	/*
-	 * Everything else assume TYPE_DISK Sector CDB location.
-	 * Use 32-bit sector value.
-	 */
-type_disk:
-	return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
-}
-
-static inline u32 pscsi_get_sectors_16(
-	unsigned char *cdb,
-	struct se_cmd *cmd,
-	int *ret)
-{
-	struct se_device *dev = cmd->se_dev;
-
-	/*
-	 * Assume TYPE_DISK for non struct se_device objects.
-	 * Use 32-bit sector value.
-	 */
-	if (!dev)
-		goto type_disk;
-
-	/*
-	 * Use 24-bit allocation length for TYPE_TAPE.
-	 */
-	if (dev->transport->get_device_type(dev) == TYPE_TAPE)
-		return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
-
-type_disk:
-	return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
-		    (cdb[12] << 8) + cdb[13];
-}
-
-/*
- * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
- */
-static inline u32 pscsi_get_sectors_32(
-	unsigned char *cdb,
-	struct se_cmd *cmd,
-	int *ret)
-{
-	/*
-	 * Assume TYPE_DISK for non struct se_device objects.
-	 * Use 32-bit sector value.
-	 */
-	return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
-		    (cdb[30] << 8) + cdb[31];
-
-}
-
-static inline u32 pscsi_get_lba_21(unsigned char *cdb)
-{
-	return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
-}
-
-static inline u32 pscsi_get_lba_32(unsigned char *cdb)
-{
-	return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
-}
-
-static inline unsigned long long pscsi_get_lba_64(unsigned char *cdb)
-{
-	unsigned int __v1, __v2;
-
-	__v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
-	__v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
-
-	return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
-}
-
-/*
- * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
- */
-static inline unsigned long long pscsi_get_lba_64_ext(unsigned char *cdb)
-{
-	unsigned int __v1, __v2;
-
-	__v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
-	__v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
-
-	return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
-}
-
-
-static inline u32 pscsi_get_size(
-	u32 sectors,
-	unsigned char *cdb,
-	struct se_cmd *cmd)
-{
-	struct se_device *dev = cmd->se_dev;
-
-	if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
-		if (cdb[1] & 1) { /* sectors */
-			return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
-		} else /* bytes */
-			return sectors;
-	}
-
-	pr_debug("Returning block_size: %u, sectors: %u == %u for"
-		" %s object\n", dev->se_sub_dev->se_dev_attrib.block_size,
-		sectors, dev->se_sub_dev->se_dev_attrib.block_size * sectors,
-		dev->transport->name);
-
-	return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
-}
-
-static int pscsi_parse_cdb(struct se_cmd *cmd, unsigned int *size)
-{
-	struct se_device *dev = cmd->se_dev;
-	struct se_subsystem_dev *su_dev = dev->se_sub_dev;
 	unsigned char *cdb = cmd->t_task_cdb;
-	int sector_ret = 0;
-	u32 sectors = 0;
-	u16 service_action;
+	unsigned int dummy_size;
 	int ret;
 
-	if (cmd->se_cmd_flags & SCF_BIDI)
-		goto out_unsupported_cdb;
-
-	switch (cdb[0]) {
-	case READ_6:
-		sectors = pscsi_get_sectors_6(cdb, cmd, &sector_ret);
-		if (sector_ret)
-			goto out_unsupported_cdb;
-		*size = pscsi_get_size(sectors, cdb, cmd);
-		cmd->t_task_lba = pscsi_get_lba_21(cdb);
-		cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
-		break;
-	case READ_10:
-		sectors = pscsi_get_sectors_10(cdb, cmd, &sector_ret);
-		if (sector_ret)
-			goto out_unsupported_cdb;
-		*size = pscsi_get_size(sectors, cdb, cmd);
-		cmd->t_task_lba = pscsi_get_lba_32(cdb);
-		cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
-		break;
-	case READ_12:
-		sectors = pscsi_get_sectors_12(cdb, cmd, &sector_ret);
-		if (sector_ret)
-			goto out_unsupported_cdb;
-		*size = pscsi_get_size(sectors, cdb, cmd);
-		cmd->t_task_lba = pscsi_get_lba_32(cdb);
-		cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
-		break;
-	case READ_16:
-		sectors = pscsi_get_sectors_16(cdb, cmd, &sector_ret);
-		if (sector_ret)
-			goto out_unsupported_cdb;
-		*size = pscsi_get_size(sectors, cdb, cmd);
-		cmd->t_task_lba = pscsi_get_lba_64(cdb);
-		cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
-		break;
-	case WRITE_6:
-		sectors = pscsi_get_sectors_6(cdb, cmd, &sector_ret);
-		if (sector_ret)
-			goto out_unsupported_cdb;
-		*size = pscsi_get_size(sectors, cdb, cmd);
-		cmd->t_task_lba = pscsi_get_lba_21(cdb);
-		cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
-		break;
-	case WRITE_10:
-	case WRITE_VERIFY:
-		sectors = pscsi_get_sectors_10(cdb, cmd, &sector_ret);
-		if (sector_ret)
-			goto out_unsupported_cdb;
-		*size = pscsi_get_size(sectors, cdb, cmd);
-		cmd->t_task_lba = pscsi_get_lba_32(cdb);
-		if (cdb[1] & 0x8)
-			cmd->se_cmd_flags |= SCF_FUA;
-		cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
-		break;
-	case WRITE_12:
-		sectors = pscsi_get_sectors_12(cdb, cmd, &sector_ret);
-		if (sector_ret)
-			goto out_unsupported_cdb;
-		*size = pscsi_get_size(sectors, cdb, cmd);
-		cmd->t_task_lba = pscsi_get_lba_32(cdb);
-		if (cdb[1] & 0x8)
-			cmd->se_cmd_flags |= SCF_FUA;
-		cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
-		break;
-	case WRITE_16:
-		sectors = pscsi_get_sectors_16(cdb, cmd, &sector_ret);
-		if (sector_ret)
-			goto out_unsupported_cdb;
-		*size = pscsi_get_size(sectors, cdb, cmd);
-		cmd->t_task_lba = pscsi_get_lba_64(cdb);
-		if (cdb[1] & 0x8)
-			cmd->se_cmd_flags |= SCF_FUA;
-		cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
-		break;
-	case VARIABLE_LENGTH_CMD:
-		service_action = get_unaligned_be16(&cdb[8]);
-		switch (service_action) {
-		case WRITE_SAME_32:
-			sectors = pscsi_get_sectors_32(cdb, cmd, &sector_ret);
-			if (sector_ret)
-				goto out_unsupported_cdb;
-
-			if (!sectors) {
-				pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
-				       " supported\n");
-				goto out_invalid_cdb_field;
-			}
-
-			*size = pscsi_get_size(1, cdb, cmd);
-			cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
-			break;
-		default:
-			pr_err("VARIABLE_LENGTH_CMD service action"
-				" 0x%04x not supported\n", service_action);
-			goto out_unsupported_cdb;
-		}
-		break;
-	case GPCMD_READ_BUFFER_CAPACITY:
-	case GPCMD_SEND_OPC:
-		*size = (cdb[7] << 8) + cdb[8];
-		break;
-	case READ_BLOCK_LIMITS:
-		*size = READ_BLOCK_LEN;
-		break;
-	case GPCMD_GET_CONFIGURATION:
-	case GPCMD_READ_FORMAT_CAPACITIES:
-	case GPCMD_READ_DISC_INFO:
-	case GPCMD_READ_TRACK_RZONE_INFO:
-		*size = (cdb[7] << 8) + cdb[8];
-		break;
-	case GPCMD_MECHANISM_STATUS:
-	case GPCMD_READ_DVD_STRUCTURE:
-		*size = (cdb[8] << 8) + cdb[9];
-		break;
-	case READ_POSITION:
-		*size = READ_POSITION_LEN;
-		break;
-	case READ_BUFFER:
-		*size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
-		break;
-	case READ_CAPACITY:
-		*size = READ_CAP_LEN;
-		break;
-	case READ_MEDIA_SERIAL_NUMBER:
-	case SERVICE_ACTION_IN:
-	case ACCESS_CONTROL_IN:
-	case ACCESS_CONTROL_OUT:
-		*size = (cdb[10] << 24) | (cdb[11] << 16) |
-		       (cdb[12] << 8) | cdb[13];
-		break;
-	case READ_TOC:
-		*size = cdb[8];
-		break;
-	case READ_ELEMENT_STATUS:
-		*size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
-		break;
-	case SYNCHRONIZE_CACHE:
-	case SYNCHRONIZE_CACHE_16:
-		/*
-		 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
-		 */
-		if (cdb[0] == SYNCHRONIZE_CACHE) {
-			sectors = pscsi_get_sectors_10(cdb, cmd, &sector_ret);
-			cmd->t_task_lba = pscsi_get_lba_32(cdb);
-		} else {
-			sectors = pscsi_get_sectors_16(cdb, cmd, &sector_ret);
-			cmd->t_task_lba = pscsi_get_lba_64(cdb);
-		}
-		if (sector_ret)
-			goto out_unsupported_cdb;
-
-		*size = pscsi_get_size(sectors, cdb, cmd);
-		break;
-	case UNMAP:
-		*size = get_unaligned_be16(&cdb[7]);
-		break;
-	case WRITE_SAME_16:
-		sectors = pscsi_get_sectors_16(cdb, cmd, &sector_ret);
-		if (sector_ret)
-			goto out_unsupported_cdb;
-
-		if (!sectors) {
-			pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
-			goto out_invalid_cdb_field;
-		}
-
-		*size = pscsi_get_size(1, cdb, cmd);
-		cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
-		break;
-	case WRITE_SAME:
-		sectors = pscsi_get_sectors_10(cdb, cmd, &sector_ret);
-		if (sector_ret)
-			goto out_unsupported_cdb;
-
-		if (!sectors) {
-			pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
-			goto out_invalid_cdb_field;
-		}
-
-		*size = pscsi_get_size(1, cdb, cmd);
-		cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
-		break;
-	case ALLOW_MEDIUM_REMOVAL:
-	case ERASE:
-	case REZERO_UNIT:
-	case SEEK_10:
-	case SPACE:
-	case START_STOP:
-	case VERIFY:
-	case WRITE_FILEMARKS:
-	case GPCMD_CLOSE_TRACK:
-	case INITIALIZE_ELEMENT_STATUS:
-	case GPCMD_LOAD_UNLOAD:
-	case GPCMD_SET_SPEED:
-	case MOVE_MEDIUM:
-		*size = 0;
-		break;
-	case GET_EVENT_STATUS_NOTIFICATION:
-		*size = (cdb[7] << 8) | cdb[8];
-		break;
-	case ATA_16:
-		switch (cdb[2] & 0x3) {		/* T_LENGTH */
-		case 0x0:
-			sectors = 0;
-			break;
-		case 0x1:
-			sectors = (((cdb[1] & 0x1) ? cdb[3] : 0) << 8) | cdb[4];
-			break;
-		case 0x2:
-			sectors = (((cdb[1] & 0x1) ? cdb[5] : 0) << 8) | cdb[6];
-			break;
-		case 0x3:
-			pr_err("T_LENGTH=0x3 not supported for ATA_16\n");
-			goto out_invalid_cdb_field;
-		}
-
-		/* BYTE_BLOCK */
-		if (cdb[2] & 0x4) {
-			/* BLOCK T_TYPE: 512 or sector */
-			*size = sectors * ((cdb[2] & 0x10) ?
-				dev->se_sub_dev->se_dev_attrib.block_size : 512);
-		} else {
-			/* BYTE */
-			*size = sectors;
-		}
-		break;
-	default:
-		ret = spc_parse_cdb(cmd, size, true);
-		if (ret)
-			return ret;
+	if (cmd->se_cmd_flags & SCF_BIDI) {
+		cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+		cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
+		return -EINVAL;
 	}
 
-	if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
-		if (sectors > su_dev->se_dev_attrib.fabric_max_sectors) {
-			printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
-				" big sectors %u exceeds fabric_max_sectors:"
-				" %u\n", cdb[0], sectors,
-				su_dev->se_dev_attrib.fabric_max_sectors);
-			goto out_invalid_cdb_field;
-		}
-		if (sectors > su_dev->se_dev_attrib.hw_max_sectors) {
-			printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
-				" big sectors %u exceeds backend hw_max_sectors:"
-				" %u\n", cdb[0], sectors,
-				su_dev->se_dev_attrib.hw_max_sectors);
-			goto out_invalid_cdb_field;
-		}
+	/*
+	 * For REPORT LUNS we always need to emulate the respone, and for everything
+	 * related to persistent reservations and ALUA we might optionally use our
+	 * handlers before passing on the command to the physical hardware.
+	 */
+	switch (cdb[0]) {
+	case REPORT_LUNS:
+	case PERSISTENT_RESERVE_IN:
+	case PERSISTENT_RESERVE_OUT:
+	case RELEASE:
+	case RELEASE_10:
+	case RESERVE:
+	case RESERVE_10:
+		ret = spc_parse_cdb(cmd, &dummy_size);
+		if (ret)
+			return ret;
+		break;
+	case READ_6:
+	case READ_10:
+	case READ_12:
+	case READ_16:
+	case WRITE_6:
+	case WRITE_10:
+	case WRITE_12:
+	case WRITE_16:
+	case WRITE_VERIFY:
+		cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
+		break;
+	default:
+		break;
 	}
 
 	return 0;
-
-out_unsupported_cdb:
-	cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
-	cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
-	return -EINVAL;
-out_invalid_cdb_field:
-	cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
-	cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
-	return -EINVAL;
 }
-
 
 static int pscsi_execute_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
 		u32 sgl_nents, enum dma_data_direction data_direction)

drivers/target/target_core_sbc.c

···
 #include "target_core_ua.h"
 
 
+static int sbc_emulate_readcapacity(struct se_cmd *cmd)
+{
+	struct se_device *dev = cmd->se_dev;
+	unsigned char *buf;
+	unsigned long long blocks_long = dev->transport->get_blocks(dev);
+	u32 blocks;
+
+	if (blocks_long >= 0x00000000ffffffff)
+		blocks = 0xffffffff;
+	else
+		blocks = (u32)blocks_long;
+
+	buf = transport_kmap_data_sg(cmd);
+
+	buf[0] = (blocks >> 24) & 0xff;
+	buf[1] = (blocks >> 16) & 0xff;
+	buf[2] = (blocks >> 8) & 0xff;
+	buf[3] = blocks & 0xff;
+	buf[4] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff;
+	buf[5] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff;
+	buf[6] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff;
+	buf[7] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff;
+
+	transport_kunmap_data_sg(cmd);
+
+	target_complete_cmd(cmd, GOOD);
+	return 0;
+}
+
+static int sbc_emulate_readcapacity_16(struct se_cmd *cmd)
+{
+	struct se_device *dev = cmd->se_dev;
+	unsigned char *buf;
+	unsigned long long blocks = dev->transport->get_blocks(dev);
+
+	buf = transport_kmap_data_sg(cmd);
+
+	buf[0] = (blocks >> 56) & 0xff;
+	buf[1] = (blocks >> 48) & 0xff;
+	buf[2] = (blocks >> 40) & 0xff;
+	buf[3] = (blocks >> 32) & 0xff;
+	buf[4] = (blocks >> 24) & 0xff;
+	buf[5] = (blocks >> 16) & 0xff;
+	buf[6] = (blocks >> 8) & 0xff;
+	buf[7] = blocks & 0xff;
+	buf[8] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff;
+	buf[9] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff;
+	buf[10] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff;
+	buf[11] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff;
+	/*
+	 * Set Thin Provisioning Enable bit following sbc3r22 in section
+	 * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
+	 */
+	if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
+		buf[14] = 0x80;
+
+	transport_kunmap_data_sg(cmd);
+
+	target_complete_cmd(cmd, GOOD);
+	return 0;
+}
+
+/*
+ * Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support.
+ * Note this is not used for TCM/pSCSI passthrough
+ */
+static int sbc_emulate_unmap(struct se_cmd *cmd)
+{
+	struct se_device *dev = cmd->se_dev;
+	unsigned char *buf, *ptr = NULL;
+	unsigned char *cdb = &cmd->t_task_cdb[0];
+	sector_t lba;
+	unsigned int size = cmd->data_length, range;
+	int ret = 0, offset;
+	unsigned short dl, bd_dl;
+
+	if (!dev->transport->do_discard) {
+		pr_err("UNMAP emulation not supported for: %s\n",
+				dev->transport->name);
+		cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
+		return -ENOSYS;
+	}
+
+	/* First UNMAP block descriptor starts at 8 byte offset */
+	offset = 8;
+	size -= 8;
+	dl = get_unaligned_be16(&cdb[0]);
+	bd_dl = get_unaligned_be16(&cdb[2]);
+
+	buf = transport_kmap_data_sg(cmd);
+
+	ptr = &buf[offset];
+	pr_debug("UNMAP: Sub: %s Using dl: %hu bd_dl: %hu size: %hu"
+		" ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
+
+	while (size) {
+		lba = get_unaligned_be64(&ptr[0]);
+		range = get_unaligned_be32(&ptr[8]);
+		pr_debug("UNMAP: Using lba: %llu and range: %u\n",
+				 (unsigned long long)lba, range);
+
+		ret = dev->transport->do_discard(dev, lba, range);
+		if (ret < 0) {
+			pr_err("blkdev_issue_discard() failed: %d\n",
+					ret);
+			goto err;
+		}
+
+		ptr += 16;
+		size -= 16;
+	}
+
+err:
+	transport_kunmap_data_sg(cmd);
+	if (!ret)
+		target_complete_cmd(cmd, GOOD);
+	return ret;
+}
+
+/*
+ * Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support.
+ * Note this is not used for TCM/pSCSI passthrough
+ */
+static int sbc_emulate_write_same(struct se_cmd *cmd)
+{
+	struct se_device *dev = cmd->se_dev;
+	sector_t range;
+	sector_t lba = cmd->t_task_lba;
+	u32 num_blocks;
+	int ret;
+
+	if (!dev->transport->do_discard) {
+		pr_err("WRITE_SAME emulation not supported"
+				" for: %s\n", dev->transport->name);
+		cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
+		return -ENOSYS;
+	}
+
+	if (cmd->t_task_cdb[0] == WRITE_SAME)
+		num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]);
+	else if (cmd->t_task_cdb[0] == WRITE_SAME_16)
+		num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]);
+	else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */
+		num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]);
+
+	/*
+	 * Use the explicit range when non zero is supplied, otherwise calculate
+	 * the remaining range based on ->get_blocks() - starting LBA.
+	 */
+	if (num_blocks != 0)
+		range = num_blocks;
+	else
+		range = (dev->transport->get_blocks(dev) - lba) + 1;
+
+	pr_debug("WRITE_SAME UNMAP: LBA: %llu Range: %llu\n",
+		 (unsigned long long)lba, (unsigned long long)range);
+
+	ret = dev->transport->do_discard(dev, lba, range);
+	if (ret < 0) {
+		pr_debug("blkdev_issue_discard() failed for WRITE_SAME\n");
+		return ret;
+	}
+
+	target_complete_cmd(cmd, GOOD);
+	return 0;
+}
+
+static int sbc_emulate_synchronize_cache(struct se_cmd *cmd)
+{
+	if (!cmd->se_dev->transport->do_sync_cache) {
+		pr_err("SYNCHRONIZE_CACHE emulation not supported"
+			" for: %s\n", cmd->se_dev->transport->name);
+		cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
+		return -ENOSYS;
+	}
+
+	cmd->se_dev->transport->do_sync_cache(cmd);
+	return 0;
+}
+
+static int sbc_emulate_verify(struct se_cmd *cmd)
+{
+	target_complete_cmd(cmd, GOOD);
+	return 0;
+}
+
 static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors)
 {
 	return cmd->se_dev->se_sub_dev->se_dev_attrib.block_size * sectors;
···
 	kfree(buf);
 }
 
-int sbc_parse_cdb(struct se_cmd *cmd, unsigned int *size)
+int sbc_parse_cdb(struct se_cmd *cmd)
 {
 	struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
 	struct se_device *dev = cmd->se_dev;
 	unsigned char *cdb = cmd->t_task_cdb;
+	unsigned int size;
 	u32 sectors = 0;
 	int ret;
 
···
 				goto out_invalid_cdb_field;
 			}
 
-			*size = sbc_get_size(cmd, 1);
+			size = sbc_get_size(cmd, 1);
 			cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
 
 			if (sbc_write_same_supported(dev, &cdb[10]) < 0)
 				goto out_unsupported_cdb;
-			cmd->execute_cmd = target_emulate_write_same;
+			cmd->execute_cmd = sbc_emulate_write_same;
 			break;
 		default:
 			pr_err("VARIABLE_LENGTH_CMD service action"
···
 		break;
 	}
 	case READ_CAPACITY:
-		*size = READ_CAP_LEN;
-		cmd->execute_cmd = target_emulate_readcapacity;
+		size = READ_CAP_LEN;
+		cmd->execute_cmd = sbc_emulate_readcapacity;
 		break;
 	case SERVICE_ACTION_IN:
 		switch (cmd->t_task_cdb[1] & 0x1f) {
 		case SAI_READ_CAPACITY_16:
-			cmd->execute_cmd = target_emulate_readcapacity_16;
+			cmd->execute_cmd = sbc_emulate_readcapacity_16;
 			break;
 		default:
 			pr_err("Unsupported SA: 0x%02x\n",
 				cmd->t_task_cdb[1] & 0x1f);
 			goto out_invalid_cdb_field;
 		}
-		*size = (cdb[10] << 24) | (cdb[11] << 16) |
+		size = (cdb[10] << 24) | (cdb[11] << 16) |
 		       (cdb[12] << 8) | cdb[13];
 		break;
 	case SYNCHRONIZE_CACHE:
···
 			cmd->t_task_lba = transport_lba_64(cdb);
 		}
 
-		*size = sbc_get_size(cmd, sectors);
+		size = sbc_get_size(cmd, sectors);
 
 		/*
 		 * Check to ensure that LBA + Range does not exceed past end of
···
 			if (sbc_check_valid_sectors(cmd) < 0)
 				goto out_invalid_cdb_field;
 		}
-		cmd->execute_cmd = target_emulate_synchronize_cache;
+		cmd->execute_cmd = sbc_emulate_synchronize_cache;
 		break;
 	case UNMAP:
-		*size = get_unaligned_be16(&cdb[7]);
-		cmd->execute_cmd = target_emulate_unmap;
+		size = get_unaligned_be16(&cdb[7]);
+		cmd->execute_cmd = sbc_emulate_unmap;
 		break;
 	case WRITE_SAME_16:
 		sectors = transport_get_sectors_16(cdb);
···
 			goto out_invalid_cdb_field;
 		}
 
-		*size = sbc_get_size(cmd, 1);
+		size = sbc_get_size(cmd, 1);
 		cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
 
 		if (sbc_write_same_supported(dev, &cdb[1]) < 0)
 			goto out_unsupported_cdb;
-		cmd->execute_cmd = target_emulate_write_same;
+		cmd->execute_cmd = sbc_emulate_write_same;
 		break;
 	case WRITE_SAME:
 		sectors = transport_get_sectors_10(cdb);
···
 			goto out_invalid_cdb_field;
 		}
 
-		*size = sbc_get_size(cmd, 1);
+		size = sbc_get_size(cmd, 1);
 		cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
 
 		/*
···
 		 */
 		if (sbc_write_same_supported(dev, &cdb[1]) < 0)
 			goto out_unsupported_cdb;
-		cmd->execute_cmd = target_emulate_write_same;
+		cmd->execute_cmd = sbc_emulate_write_same;
 		break;
 	case VERIFY:
-		*size = 0;
-		cmd->execute_cmd = target_emulate_noop;
+		size = 0;
+		cmd->execute_cmd = sbc_emulate_verify;
 		break;
 	default:
-		ret = spc_parse_cdb(cmd, size, false);
+		ret = spc_parse_cdb(cmd, &size);
 		if (ret)
 			return ret;
 	}
···
 		goto out_unsupported_cdb;
 
 	if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
+		unsigned long long end_lba;
+
 		if (sectors > su_dev->se_dev_attrib.fabric_max_sectors) {
 			printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
 				" big sectors %u exceeds fabric_max_sectors:"
···
 			goto out_invalid_cdb_field;
 		}
 
-		*size = sbc_get_size(cmd, sectors);
+		end_lba = dev->transport->get_blocks(dev) + 1;
+		if (cmd->t_task_lba + sectors > end_lba) {
+			pr_err("cmd exceeds last lba %llu "
+				"(lba %llu, sectors %u)\n",
+				end_lba, cmd->t_task_lba, sectors);
+			goto out_invalid_cdb_field;
+		}
+
+		size = sbc_get_size(cmd, sectors);
 	}
+
+	ret = target_cmd_size_check(cmd, size);
+	if (ret < 0)
+		return ret;
 
 	return 0;
 

drivers/target/target_core_spc.c

···
 #include "target_core_ua.h"
 
 
-int spc_parse_cdb(struct se_cmd *cmd, unsigned int *size, bool passthrough)
+static void spc_fill_alua_data(struct se_port *port, unsigned char *buf)
+{
+	struct t10_alua_tg_pt_gp *tg_pt_gp;
+	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
+
+	/*
+	 * Set SCCS for MAINTENANCE_IN + REPORT_TARGET_PORT_GROUPS.
+	 */
+	buf[5]	= 0x80;
+
+	/*
+	 * Set TPGS field for explict and/or implict ALUA access type
+	 * and opteration.
+	 *
+	 * See spc4r17 section 6.4.2 Table 135
+	 */
+	if (!port)
+		return;
+	tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
+	if (!tg_pt_gp_mem)
+		return;
+
+	spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
+	tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
+	if (tg_pt_gp)
+		buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type;
+	spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
+}
+
+static int spc_emulate_inquiry_std(struct se_cmd *cmd, char *buf)
+{
+	struct se_lun *lun = cmd->se_lun;
+	struct se_device *dev = cmd->se_dev;
+
+	/* Set RMB (removable media) for tape devices */
+	if (dev->transport->get_device_type(dev) == TYPE_TAPE)
+		buf[1] = 0x80;
+
+	buf[2] = dev->transport->get_device_rev(dev);
+
+	/*
+	 * NORMACA and HISUP = 0, RESPONSE DATA FORMAT = 2
+	 *
+	 * SPC4 says:
+	 *   A RESPONSE DATA FORMAT field set to 2h indicates that the
+	 *   standard INQUIRY data is in the format defined in this
+	 *   standard. Response data format values less than 2h are
+	 *   obsolete. Response data format values greater than 2h are
+	 *   reserved.
+	 */
+	buf[3] = 2;
+
+	/*
+	 * Enable SCCS and TPGS fields for Emulated ALUA
+	 */
+	if (dev->se_sub_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED)
+		spc_fill_alua_data(lun->lun_sep, buf);
+
+	buf[7] = 0x2; /* CmdQue=1 */
+
+	snprintf(&buf[8], 8, "LIO-ORG");
+	snprintf(&buf[16], 16, "%s", dev->se_sub_dev->t10_wwn.model);
+	snprintf(&buf[32], 4, "%s", dev->se_sub_dev->t10_wwn.revision);
+	buf[4] = 31; /* Set additional length to 31 */
+
+	return 0;
+}
+
+/* unit serial number */
+static int spc_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf)
+{
+	struct se_device *dev = cmd->se_dev;
+	u16 len = 0;
+
+	if (dev->se_sub_dev->su_dev_flags &
+			SDF_EMULATED_VPD_UNIT_SERIAL) {
+		u32 unit_serial_len;
+
+		unit_serial_len = strlen(dev->se_sub_dev->t10_wwn.unit_serial);
+		unit_serial_len++; /* For NULL Terminator */
+
+		len += sprintf(&buf[4], "%s",
+			dev->se_sub_dev->t10_wwn.unit_serial);
+		len++; /* Extra Byte for NULL Terminator */
+		buf[3] = len;
+	}
+	return 0;
+}
+
+static void spc_parse_naa_6h_vendor_specific(struct se_device *dev,
+		unsigned char *buf)
+{
+	unsigned char *p = &dev->se_sub_dev->t10_wwn.unit_serial[0];
+	int cnt;
+	bool next = true;
+
+	/*
+	 * Generate up to 36 bits of VENDOR SPECIFIC IDENTIFIER starting on
+	 * byte 3 bit 3-0 for NAA IEEE Registered Extended DESIGNATOR field
+	 * format, followed by 64 bits of VENDOR SPECIFIC IDENTIFIER EXTENSION
+	 * to complete the payload.  These are based from VPD=0x80 PRODUCT SERIAL
+	 * NUMBER set via vpd_unit_serial in target_core_configfs.c to ensure
+	 * per device uniqeness.
+	 */
+	for (cnt = 0; *p && cnt < 13; p++) {
+		int val = hex_to_bin(*p);
+
+		if (val < 0)
+			continue;
+
+		if (next) {
+			next = false;
+			buf[cnt++] |= val;
+		} else {
+			next = true;
+			buf[cnt] = val << 4;
+		}
+	}
+}
+
+/*
+ * Device identification VPD, for a complete list of
+ * DESIGNATOR TYPEs see spc4r17 Table 459.
+ */
+static int spc_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf)
+{
+	struct se_device *dev = cmd->se_dev;
+	struct se_lun *lun = cmd->se_lun;
+	struct se_port *port = NULL;
+	struct se_portal_group *tpg = NULL;
+	struct t10_alua_lu_gp_member *lu_gp_mem;
+	struct t10_alua_tg_pt_gp *tg_pt_gp;
+	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
+	unsigned char *prod = &dev->se_sub_dev->t10_wwn.model[0];
+	u32 prod_len;
+	u32 unit_serial_len, off = 0;
+	u16 len = 0, id_len;
+
+	off = 4;
+
+	/*
+	 * NAA IEEE Registered Extended Assigned designator format, see
+	 * spc4r17 section 7.7.3.6.5
+	 *
+	 * We depend upon a target_core_mod/ConfigFS provided
+	 * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial
+	 * value in order to return the NAA id.
+	 */
+	if (!(dev->se_sub_dev->su_dev_flags & SDF_EMULATED_VPD_UNIT_SERIAL))
+		goto check_t10_vend_desc;
+
+	/* CODE SET == Binary */
+	buf[off++] = 0x1;
+
+	/* Set ASSOCIATION == addressed logical unit: 0)b */
+	buf[off] = 0x00;
+
+	/* Identifier/Designator type == NAA identifier */
+	buf[off++] |= 0x3;
+	off++;
+
+	/* Identifier/Designator length */
+	buf[off++] = 0x10;
+
+	/*
+	 * Start NAA IEEE Registered Extended Identifier/Designator
+	 */
+	buf[off++] = (0x6 << 4);
+
+	/*
+	 * Use OpenFabrics IEEE Company ID: 00 14 05
+	 */
+	buf[off++] = 0x01;
+	buf[off++] = 0x40;
+	buf[off] = (0x5 << 4);
+
+	/*
+	 * Return ConfigFS Unit Serial Number information for
+	 * VENDOR_SPECIFIC_IDENTIFIER and
+	 * VENDOR_SPECIFIC_IDENTIFIER_EXTENTION
+	 */
+	spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
+
+	len = 20;
+	off = (len + 4);
+
+check_t10_vend_desc:
+	/*
+	 * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4
+	 */
+	id_len = 8; /* For Vendor field */
+	prod_len = 4; /* For VPD Header */
+	prod_len += 8; /* For Vendor field */
+	prod_len += strlen(prod);
+	prod_len++; /* For : */
+
+	if (dev->se_sub_dev->su_dev_flags &
+			SDF_EMULATED_VPD_UNIT_SERIAL) {
+		unit_serial_len =
+			strlen(&dev->se_sub_dev->t10_wwn.unit_serial[0]);
+		unit_serial_len++; /* For NULL Terminator */
+
+		id_len += sprintf(&buf[off+12], "%s:%s", prod,
+				&dev->se_sub_dev->t10_wwn.unit_serial[0]);
+	}
+	buf[off] = 0x2; /* ASCII */
+	buf[off+1] = 0x1; /* T10 Vendor ID */
+	buf[off+2] = 0x0;
+	memcpy(&buf[off+4], "LIO-ORG", 8);
+	/* Extra Byte for NULL Terminator */
+	id_len++;
+	/* Identifier Length */
+	buf[off+3] = id_len;
+	/* Header size for Designation descriptor */
+	len += (id_len + 4);
+	off += (id_len + 4);
+	/*
+	 * struct se_port is only set for INQUIRY VPD=1 through $FABRIC_MOD
+	 */
+	port = lun->lun_sep;
+	if (port) {
+		struct t10_alua_lu_gp *lu_gp;
+		u32 padding, scsi_name_len;
+		u16 lu_gp_id = 0;
+		u16 tg_pt_gp_id = 0;
+		u16 tpgt;
+
+		tpg = port->sep_tpg;
+		/*
+		 * Relative target port identifer, see spc4r17
+		 * section 7.7.3.7
+		 *
+		 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
+		 * section 7.5.1 Table 362
+		 */
+		buf[off] =
+			(tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
+		buf[off++] |= 0x1; /* CODE SET == Binary */
+		buf[off] = 0x80; /* Set PIV=1 */
+		/* Set ASSOCIATION == target port: 01b */
+		buf[off] |= 0x10;
+		/* DESIGNATOR TYPE == Relative target port identifer */
+		buf[off++] |= 0x4;
+		off++; /* Skip over Reserved */
+		buf[off++] = 4; /* DESIGNATOR LENGTH */
+		/* Skip over Obsolete field in RTPI payload
+		 * in Table 472 */
+		off += 2;
+		buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
+		buf[off++] = (port->sep_rtpi & 0xff);
+		len += 8; /* Header size + Designation descriptor */
+		/*
+		 * Target port group identifier, see spc4r17
+		 * section 7.7.3.8
+		 *
+		 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
+		 * section 7.5.1 Table 362
+		 */
+		if (dev->se_sub_dev->t10_alua.alua_type !=
+				SPC3_ALUA_EMULATED)
+			goto check_scsi_name;
+
+		tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
+		if (!tg_pt_gp_mem)
+			goto check_lu_gp;
+
+		spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
+		tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
+		if (!tg_pt_gp) {
+			spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
+			goto check_lu_gp;
+		}
+		tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id;
+		spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
+
+		buf[off] =
+			(tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
+		buf[off++] |= 0x1; /* CODE SET == Binary */
+		buf[off] = 0x80; /* Set PIV=1 */
+		/* Set ASSOCIATION == target port: 01b */
+		buf[off] |= 0x10;
+		/* DESIGNATOR TYPE == Target port group identifier */
+		buf[off++] |= 0x5;
+		off++; /* Skip over Reserved */
+		buf[off++] = 4; /* DESIGNATOR LENGTH */
+		off += 2; /* Skip over Reserved Field */
+		buf[off++] = ((tg_pt_gp_id >> 8) & 0xff);
+		buf[off++] = (tg_pt_gp_id & 0xff);
+		len += 8; /* Header size + Designation descriptor */
+		/*
+		 * Logical Unit Group identifier, see spc4r17
+		 * section 7.7.3.8
+		 */
+check_lu_gp:
+		lu_gp_mem = dev->dev_alua_lu_gp_mem;
+		if (!lu_gp_mem)
+			goto check_scsi_name;
+
+		spin_lock(&lu_gp_mem->lu_gp_mem_lock);
+		lu_gp = lu_gp_mem->lu_gp;
+		if (!lu_gp) {
+			spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
+			goto check_scsi_name;
+		}
+		lu_gp_id = lu_gp->lu_gp_id;
+		spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
+
+		buf[off++] |= 0x1; /* CODE SET == Binary */
+		/* DESIGNATOR TYPE == Logical Unit Group identifier */
+		buf[off++] |= 0x6;
+		off++; /* Skip over Reserved */
+		buf[off++] = 4; /* DESIGNATOR LENGTH */
+		off += 2; /* Skip over Reserved Field */
+		buf[off++] = ((lu_gp_id >> 8) & 0xff);
+		buf[off++] = (lu_gp_id & 0xff);
+		len += 8; /* Header size + Designation descriptor */
+		/*
+		 * SCSI name string designator, see spc4r17
+		 * section 7.7.3.11
+		 *
+		 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
+		 * section 7.5.1 Table 362
+		 */
+check_scsi_name:
+		scsi_name_len = strlen(tpg->se_tpg_tfo->tpg_get_wwn(tpg));
+		/* UTF-8 ",t,0x<16-bit TPGT>" + NULL Terminator */
+		scsi_name_len += 10;
+		/* Check for 4-byte padding */
+		padding = ((-scsi_name_len) & 3);
+		if (padding != 0)
+			scsi_name_len += padding;
+		/* Header size + Designation descriptor */
+		scsi_name_len += 4;
+
+		buf[off] =
+			(tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
+		buf[off++] |= 0x3; /* CODE SET == UTF-8 */
+		buf[off] = 0x80; /* Set PIV=1 */
+		/* Set ASSOCIATION == target port: 01b */
+		buf[off] |= 0x10;
+		/* DESIGNATOR TYPE == SCSI name string */
+		buf[off++] |= 0x8;
+		off += 2; /* Skip over Reserved and length */
+		/*
+		 * SCSI name string identifer containing, $FABRIC_MOD
+		 * dependent information.  For LIO-Target and iSCSI
+		 * Target Port, this means "<iSCSI name>,t,0x<TPGT> in
+		 * UTF-8 encoding.
+		 */
+		tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
+		scsi_name_len = sprintf(&buf[off], "%s,t,0x%04x",
+					tpg->se_tpg_tfo->tpg_get_wwn(tpg), tpgt);
+		scsi_name_len += 1 /* Include  NULL terminator */;
+		/*
+		 * The null-terminated, null-padded (see 4.4.2) SCSI
+		 * NAME STRING field contains a UTF-8 format string.
+		 * The number of bytes in the SCSI NAME STRING field
+		 * (i.e., the value in the DESIGNATOR LENGTH field)
+		 * shall be no larger than 256 and shall be a multiple
+		 * of four.
+		 */
+		if (padding)
+			scsi_name_len += padding;
+
+		buf[off-1] = scsi_name_len;
+		off += scsi_name_len;
+		/* Header size + Designation descriptor */
+		len += (scsi_name_len + 4);
+	}
+	buf[2] = ((len >> 8) & 0xff);
+	buf[3] = (len & 0xff); /* Page Length for VPD 0x83 */
+	return 0;
+}
+
+/* Extended INQUIRY Data VPD Page */
+static int spc_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf)
+{
+	buf[3] = 0x3c;
+	/* Set HEADSUP, ORDSUP, SIMPSUP */
+	buf[5] = 0x07;
+
+	/* If WriteCache emulation is enabled, set V_SUP */
+	if (cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0)
+		buf[6] = 0x01;
+	return 0;
+}
+
+/* Block Limits VPD page */
+static int spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
+{
+	struct se_device *dev = cmd->se_dev;
+	u32 max_sectors;
+	int have_tp = 0;
+
+	/*
+	 * Following spc3r22 section 6.5.3 Block Limits VPD page, when
+	 * emulate_tpu=1 or emulate_tpws=1 we will be expect a
+	 * different page length for Thin Provisioning.
+	 */
+	if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
+		have_tp = 1;
+
+	buf[0] = dev->transport->get_device_type(dev);
+	buf[3] = have_tp ? 0x3c : 0x10;
+
+	/* Set WSNZ to 1 */
+	buf[4] = 0x01;
+
+	/*
+	 * Set OPTIMAL TRANSFER LENGTH GRANULARITY
+	 */
+	put_unaligned_be16(1, &buf[6]);
+
+	/*
+	 * Set MAXIMUM TRANSFER LENGTH
+	 */
+	max_sectors = min(dev->se_sub_dev->se_dev_attrib.fabric_max_sectors,
+			  dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
+	put_unaligned_be32(max_sectors, &buf[8]);
+
+	/*
+	 * Set OPTIMAL TRANSFER LENGTH
+	 */
+	put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.optimal_sectors, &buf[12]);
+
+	/*
+	 * Exit now if we don't support TP.
+	 */
+	if (!have_tp)
+		return 0;
+
+	/*
+	 * Set MAXIMUM UNMAP LBA COUNT
+	 */
+	put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count, &buf[20]);
+
+	/*
+	 * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT
+	 */
+	put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count,
+			   &buf[24]);
+
+	/*
+	 * Set OPTIMAL UNMAP GRANULARITY
+	 */
+	put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.unmap_granularity, &buf[28]);
+
+	/*
+	 * UNMAP GRANULARITY ALIGNMENT
+	 */
+	put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment,
+			   &buf[32]);
+	if (dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment != 0)
+		buf[32] |= 0x80; /* Set the UGAVALID bit */
+
+	return 0;
+}
+
+/* Block Device Characteristics VPD page */
+static int spc_emulate_evpd_b1(struct se_cmd *cmd, unsigned char *buf)
+{
+	struct se_device *dev = cmd->se_dev;
+
+	buf[0] = dev->transport->get_device_type(dev);
+	buf[3] = 0x3c;
+	buf[5] = dev->se_sub_dev->se_dev_attrib.is_nonrot ? 1 : 0;
+
+	return 0;
+}
+
+/* Thin Provisioning VPD */
+static int spc_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf)
+{
+	struct se_device *dev = cmd->se_dev;
+
+	/*
+	 * From spc3r22 section 6.5.4 Thin Provisioning VPD page:
+	 *
+	 * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to
+	 * zero, then the page length shall be set to 0004h.  If the DP bit
+	 * is set to one, then the page length shall be set to the value
+	 * defined in table 162.
+	 */
+	buf[0] = dev->transport->get_device_type(dev);
+
+	/*
+	 * Set Hardcoded length mentioned above for DP=0
+	 */
+	put_unaligned_be16(0x0004, &buf[2]);
+
+	/*
+	 * The THRESHOLD EXPONENT field indicates the threshold set size in
+	 * LBAs as a power of 2 (i.e., the threshold set size is equal to
+	 * 2(threshold exponent)).
+	 *
+	 * Note that this is currently set to 0x00 as mkp says it will be
+	 * changing again.  We can enable this once it has settled in T10
+	 * and is actually used by Linux/SCSI ML code.
+	 */
+	buf[4] = 0x00;
+
+	/*
+	 * A TPU bit set to one indicates that the device server supports
+	 * the UNMAP command (see 5.25). A TPU bit set to zero indicates
+	 * that the device server does not support the UNMAP command.
+	 */
+	if (dev->se_sub_dev->se_dev_attrib.emulate_tpu != 0)
+		buf[5] = 0x80;
+
+	/*
+	 * A TPWS bit set to one indicates that the device server supports
+	 * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs.
+	 * A TPWS bit set to zero indicates that the device server does not
+	 * support the use of the WRITE SAME (16) command to unmap LBAs.
+	 */
+	if (dev->se_sub_dev->se_dev_attrib.emulate_tpws != 0)
+		buf[5] |= 0x40;
+
+	return 0;
+}
+
+static int spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf);
+
+static struct {
+	uint8_t		page;
+	int		(*emulate)(struct se_cmd *, unsigned char *);
+} evpd_handlers[] = {
+	{ .page = 0x00, .emulate = spc_emulate_evpd_00 },
+	{ .page = 0x80, .emulate = spc_emulate_evpd_80 },
+	{ .page = 0x83, .emulate = spc_emulate_evpd_83 },
+	{ .page = 0x86, .emulate = spc_emulate_evpd_86 },
+	{ .page = 0xb0, .emulate = spc_emulate_evpd_b0 },
+	{ .page = 0xb1, .emulate = spc_emulate_evpd_b1 },
+	{ .page = 0xb2, .emulate = spc_emulate_evpd_b2 },
+};
+
+/* supported vital product data pages */
+static int spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf)
+{
+	int p;
+
+	/*
+	 * Only report the INQUIRY EVPD=1 pages after a valid NAA
+	 * Registered Extended LUN WWN has been set via ConfigFS
+	 * during device creation/restart.
+	 */
+	if (cmd->se_dev->se_sub_dev->su_dev_flags &
+			SDF_EMULATED_VPD_UNIT_SERIAL) {
+		buf[3] = ARRAY_SIZE(evpd_handlers);
+		for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p)
+			buf[p + 4] = evpd_handlers[p].page;
+	}
+
+	return 0;
+}
+
+static int spc_emulate_inquiry(struct se_cmd *cmd)
+{
+	struct se_device *dev = cmd->se_dev;
+	struct se_portal_group *tpg = cmd->se_lun->lun_sep->sep_tpg;
+	unsigned char *buf, *map_buf;
+	unsigned char *cdb = cmd->t_task_cdb;
+	int p, ret;
+
+	map_buf = transport_kmap_data_sg(cmd);
+	/*
+	 * If SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC is not set, then we
+	 * know we actually allocated a full page.  Otherwise, if the
+	 * data buffer is too small, allocate a temporary buffer so we
+	 * don't have to worry about overruns in all our INQUIRY
+	 * emulation handling.
+	 */
+	if (cmd->data_length < SE_INQUIRY_BUF &&
+	    (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)) {
+		buf = kzalloc(SE_INQUIRY_BUF, GFP_KERNEL);
+		if (!buf) {
+			transport_kunmap_data_sg(cmd);
+			cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+			return -ENOMEM;
+		}
+	} else {
+		buf = map_buf;
+	}
+
+	if (dev == tpg->tpg_virt_lun0.lun_se_dev)
+		buf[0] = 0x3f; /* Not connected */
+	else
+		buf[0] = dev->transport->get_device_type(dev);
+
+	if (!(cdb[1] & 0x1)) {
+		if (cdb[2]) {
+			pr_err("INQUIRY with EVPD==0 but PAGE CODE=%02x\n",
+			       cdb[2]);
+			cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
+			ret = -EINVAL;
+			goto out;
+		}
+
+		ret = spc_emulate_inquiry_std(cmd, buf);
+		goto out;
+	}
+
+	for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) {
+		if (cdb[2] == evpd_handlers[p].page) {
+			buf[1] = cdb[2];
+			ret = evpd_handlers[p].emulate(cmd, buf);
+			goto out;
+		}
+	}
+
+	pr_err("Unknown VPD Code: 0x%02x\n", cdb[2]);
+	cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
+	ret = -EINVAL;
+
+out:
+	if (buf != map_buf) {
+		memcpy(map_buf, buf, cmd->data_length);
+		kfree(buf);
+	}
+	transport_kunmap_data_sg(cmd);
+
+	if (!ret)
+		target_complete_cmd(cmd, GOOD);
+	return ret;
+}
+
+static int spc_modesense_rwrecovery(unsigned char *p)
+{
+	p[0] = 0x01;
+	p[1] = 0x0a;
+
+	return 12;
+}
+
+static int spc_modesense_control(struct se_device *dev, unsigned char *p)
+{
+	p[0] = 0x0a;
+	p[1] = 0x0a;
+	p[2] = 2;
+	/*
+	 * From spc4r23, 7.4.7 Control mode page
+	 *
+	 * The QUEUE ALGORITHM MODIFIER field (see table 368) specifies
+	 * restrictions on the algorithm used for reordering commands
+	 * having the SIMPLE task attribute (see SAM-4).
+	 *
+	 *                    Table 368 -- QUEUE ALGORITHM MODIFIER field
+	 *                         Code      Description
+	 *                          0h       Restricted reordering
+	 *                          1h       Unrestricted reordering allowed
+	 *                          2h to 7h    Reserved
+	 *                          8h to Fh    Vendor specific
+	 *
+	 * A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that
+	 * the device server shall order the processing sequence of commands
+	 * having the SIMPLE task attribute such that data integrity is maintained
+	 * for that I_T nexus (i.e., if the transmission of new SCSI transport protocol
+	 * requests is halted at any time, the final value of all data observable
+	 * on the medium shall be the same as if all the commands had been processed
+	 * with the ORDERED task attribute).
+	 *
+	 * A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the
+	 * device server may reorder the processing sequence of commands having the
+	 * SIMPLE task attribute in any manner. Any data integrity exposures related to
+	 * command sequence order shall be explicitly handled by the application client
+	 * through the selection of appropriate ommands and task attributes.
+	 */
+	p[3] = (dev->se_sub_dev->se_dev_attrib.emulate_rest_reord == 1) ? 0x00 : 0x10;
+	/*
+	 * From spc4r17, section 7.4.6 Control mode Page
+	 *
+	 * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b
+	 *
+	 * 00b: The logical unit shall clear any unit attention condition
+	 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
+	 * status and shall not establish a unit attention condition when a com-
+	 * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT
+	 * status.
+	 *
+	 * 10b: The logical unit shall not clear any unit attention condition
+	 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
+	 * status and shall not establish a unit attention condition when
+	 * a command is completed with BUSY, TASK SET FULL, or RESERVATION
+	 * CONFLICT status.
+	 *
+	 * 11b a The logical unit shall not clear any unit attention condition
+	 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
+	 * status and shall establish a unit attention condition for the
+	 * initiator port associated with the I_T nexus on which the BUSY,
+	 * TASK SET FULL, or RESERVATION CONFLICT status is being returned.
+	 * Depending on the status, the additional sense code shall be set to
+	 * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS
+	 * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE
+	 * command, a unit attention condition shall be established only once
+	 * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless
+	 * to the number of commands completed with one of those status codes.
+	 */
+	p[4] = (dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2) ? 0x30 :
+	       (dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 1) ? 0x20 : 0x00;
+	/*
+	 * From spc4r17, section 7.4.6 Control mode Page
+	 *
+	 * Task Aborted Status (TAS) bit set to zero.
+	 *
+	 * A task aborted status (TAS) bit set to zero specifies that aborted
+	 * tasks shall be terminated by the device server without any response
+	 * to the application client. A TAS bit set to one specifies that tasks
+	 * aborted by the actions of an I_T nexus other than the I_T nexus on
+	 * which the command was received shall be completed with TASK ABORTED
+	 * status (see SAM-4).
+	 */
+	p[5] = (dev->se_sub_dev->se_dev_attrib.emulate_tas) ? 0x40 : 0x00;
+	p[8] = 0xff;
+	p[9] = 0xff;
+	p[11] = 30;
+
+	return 12;
+}
+
+static int spc_modesense_caching(struct se_device *dev, unsigned char *p)
+{
+	p[0] = 0x08;
+	p[1] = 0x12;
+	if (dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0)
+		p[2] = 0x04; /* Write Cache Enable */
+	p[12] = 0x20; /* Disabled Read Ahead */
+
+	return 20;
+}
+
+static void spc_modesense_write_protect(unsigned char *buf, int type)
+{
+	/*
+	 * I believe that the WP bit (bit 7) in the mode header is the same for
+	 * all device types..
+	 */
+	switch (type) {
+	case TYPE_DISK:
+	case TYPE_TAPE:
+	default:
+		buf[0] |= 0x80; /* WP bit */
+		break;
+	}
+}
+
+static void spc_modesense_dpofua(unsigned char *buf, int type)
+{
+	switch (type) {
+	case TYPE_DISK:
+		buf[0] |= 0x10; /* DPOFUA bit */
+		break;
+	default:
+		break;
+	}
+}
+
+static int spc_emulate_modesense(struct se_cmd *cmd)
+{
+	struct se_device *dev = cmd->se_dev;
+	char *cdb = cmd->t_task_cdb;
+	unsigned char *rbuf;
+	int type = dev->transport->get_device_type(dev);
+	int ten = (cmd->t_task_cdb[0] == MODE_SENSE_10);
+	int offset = ten ? 8 : 4;
+	int length = 0;
+	unsigned char buf[SE_MODE_PAGE_BUF];
+
+	memset(buf, 0, SE_MODE_PAGE_BUF);
+
+	switch (cdb[2] & 0x3f) {
+	case 0x01:
+		length = spc_modesense_rwrecovery(&buf[offset]);
+		break;
+	case 0x08:
+		length = spc_modesense_caching(dev, &buf[offset]);
+		break;
+	case 0x0a:
+		length = spc_modesense_control(dev, &buf[offset]);
+		break;
+	case 0x3f:
+		length = spc_modesense_rwrecovery(&buf[offset]);
+		length += spc_modesense_caching(dev, &buf[offset+length]);
+		length += spc_modesense_control(dev, &buf[offset+length]);
+		break;
+	default:
+		pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n",
+		       cdb[2] & 0x3f, cdb[3]);
+		cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
+		return -EINVAL;
+	}
+	offset += length;
+
+	if (ten) {
+		offset -= 2;
+		buf[0] = (offset >> 8) & 0xff;
+		buf[1] = offset & 0xff;
+
+		if ((cmd->se_lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) ||
+		    (cmd->se_deve &&
+		    (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)))
+			spc_modesense_write_protect(&buf[3], type);
+
+		if ((dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0) &&
+		    (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0))
+			spc_modesense_dpofua(&buf[3], type);
+
+		if ((offset + 2) > cmd->data_length)
+			offset = cmd->data_length;
+
+	} else {
+		offset -= 1;
+		buf[0] = offset & 0xff;
+
+		if ((cmd->se_lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) ||
+		    (cmd->se_deve &&
+		    (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)))
+			spc_modesense_write_protect(&buf[2], type);
+
+		if ((dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0) &&
+		    (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0))
+			spc_modesense_dpofua(&buf[2], type);
+
+		if ((offset + 1) > cmd->data_length)
+			offset = cmd->data_length;
+	}
+
+	rbuf = transport_kmap_data_sg(cmd);
+	memcpy(rbuf, buf, offset);
+	transport_kunmap_data_sg(cmd);
+
+	target_complete_cmd(cmd, GOOD);
+	return 0;
+}
+
+static int spc_emulate_request_sense(struct se_cmd *cmd)
+{
+	unsigned char *cdb = cmd->t_task_cdb;
+	unsigned char *buf;
+	u8 ua_asc = 0, ua_ascq = 0;
+	int err = 0;
+
+	if (cdb[1] & 0x01) {
+		pr_err("REQUEST_SENSE description emulation not"
+			" supported\n");
+		cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
+		return -ENOSYS;
+	}
+
+	buf = transport_kmap_data_sg(cmd);
+
+	if (!core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq)) {
+		/*
+		 * CURRENT ERROR, UNIT ATTENTION
+		 */
+		buf[0] = 0x70;
+		buf[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
+
+		if (cmd->data_length < 18) {
+			buf[7] = 0x00;
+			err = -EINVAL;
+			goto end;
+		}
+		/*
+		 * The Additional Sense Code (ASC) from the UNIT ATTENTION
+		 */
+		buf[SPC_ASC_KEY_OFFSET] = ua_asc;
+		buf[SPC_ASCQ_KEY_OFFSET] = ua_ascq;
+		buf[7] = 0x0A;
+	} else {
+		/*
+		 * CURRENT ERROR, NO SENSE
+		 */
+		buf[0] = 0x70;
+		buf[SPC_SENSE_KEY_OFFSET] = NO_SENSE;
+
+		if (cmd->data_length < 18) {
+			buf[7] = 0x00;
+			err = -EINVAL;
+			goto end;
+		}
+		/*
+		 * NO ADDITIONAL SENSE INFORMATION
+		 */
+		buf[SPC_ASC_KEY_OFFSET] = 0x00;
+		buf[7] = 0x0A;
+	}
+
+end:
+	transport_kunmap_data_sg(cmd);
+	target_complete_cmd(cmd, GOOD);
+	return 0;
+}
+
+static int spc_emulate_testunitready(struct se_cmd *cmd)
+{
+	target_complete_cmd(cmd, GOOD);
+	return 0;
+}
+
+int spc_parse_cdb(struct se_cmd *cmd, unsigned int *size)
 {
 	struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
 	unsigned char *cdb = cmd->t_task_cdb;
···
 		break;
 	case MODE_SENSE:
 		*size = cdb[4];
-		if (!passthrough)
-			cmd->execute_cmd = target_emulate_modesense;
+		cmd->execute_cmd = spc_emulate_modesense;
 		break;
 	case MODE_SENSE_10:
 		*size = (cdb[7] << 8) + cdb[8];
-		if (!passthrough)
-			cmd->execute_cmd = target_emulate_modesense;
+		cmd->execute_cmd = spc_emulate_modesense;
 		break;
 	case LOG_SELECT:
 	case LOG_SENSE:
···
 		break;
 	case REQUEST_SENSE:
 		*size = cdb[4];
-		if (!passthrough)
-			cmd->execute_cmd = target_emulate_request_sense;
+		cmd->execute_cmd = spc_emulate_request_sense;
 		break;
 	case INQUIRY:
 		*size = (cdb[3] << 8) + cdb[4];
···
 		 */
 		if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
 			cmd->sam_task_attr = MSG_HEAD_TAG;
-		if (!passthrough)
-			cmd->execute_cmd = target_emulate_inquiry;
+		cmd->execute_cmd = spc_emulate_inquiry;
 		break;
 	case SECURITY_PROTOCOL_IN:
 	case SECURITY_PROTOCOL_OUT:
···
 			cmd->sam_task_attr = MSG_HEAD_TAG;
 		break;
 	case TEST_UNIT_READY:
+		cmd->execute_cmd = spc_emulate_testunitready;
 		*size = 0;
-		if (!passthrough)
-			cmd->execute_cmd = target_emulate_noop;
 		break;
 	default:
 		pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"

drivers/target/target_core_transport.c

···
 	}
 }
 
-static int target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
+int target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
 {
 	struct se_device *dev = cmd->se_dev;
 
···
 	u32 pr_reg_type = 0;
 	u8 alua_ascq = 0;
 	unsigned long flags;
-	unsigned int size;
 	int ret;
 
 	transport_generic_prepare_cdb(cdb);
···
 		 */
 	}
 
-	ret = cmd->se_dev->transport->parse_cdb(cmd, &size);
-	if (ret < 0)
-		return ret;
-
-	ret = target_cmd_size_check(cmd, size);
+	ret = cmd->se_dev->transport->parse_cdb(cmd);
 	if (ret < 0)
 		return ret;
 
···
 	return -1;
 }
 
-static inline long long transport_dev_end_lba(struct se_device *dev)
-{
-	return dev->transport->get_blocks(dev) + 1;
-}
-
-static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
-{
-	struct se_device *dev = cmd->se_dev;
-	u32 sectors;
-
-	if (dev->transport->get_device_type(dev) != TYPE_DISK)
-		return 0;
-
-	sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
-
-	if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
-		pr_err("LBA: %llu Sectors: %u exceeds"
-			" transport_dev_end_lba(): %llu\n",
-			cmd->t_task_lba, sectors,
-			transport_dev_end_lba(dev));
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
 /*
  * Called from I/O completion to determine which dormant/delayed
  * and ordered cmds need to have their tasks added to the execution queue.
···
  */
 int transport_generic_new_cmd(struct se_cmd *cmd)
 {
-	struct se_device *dev = cmd->se_dev;
 	int ret = 0;
 
 	/*
···
 		INIT_WORK(&cmd->work, target_complete_ok_work);
 		queue_work(target_completion_wq, &cmd->work);
 		return 0;
-	}
-
-	if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
-		struct se_dev_attrib *attr = &dev->se_sub_dev->se_dev_attrib;
-
-		if (transport_cmd_get_valid_sectors(cmd) < 0)
-			return -EINVAL;
-
-		BUG_ON(cmd->data_length % attr->block_size);
-		BUG_ON(DIV_ROUND_UP(cmd->data_length, attr->block_size) >
-			attr->hw_max_sectors);
 	}
 
 	atomic_inc(&cmd->t_fe_count);

include/target/target_core_backend.h

···
 	void (*free_device)(void *);
 	int (*transport_complete)(struct se_cmd *cmd, struct scatterlist *);
 
-	int (*parse_cdb)(struct se_cmd *cmd, unsigned int *size);
+	int (*parse_cdb)(struct se_cmd *cmd);
 	int (*execute_cmd)(struct se_cmd *, struct scatterlist *, u32,
 			enum dma_data_direction);
 	int (*do_discard)(struct se_device *, sector_t, u32);
···
 
 void	target_complete_cmd(struct se_cmd *, u8);
 
-int	sbc_parse_cdb(struct se_cmd *cmd, unsigned int *size);
-int	spc_parse_cdb(struct se_cmd *cmd, unsigned int *size, bool passthrough);
+int	sbc_parse_cdb(struct se_cmd *cmd);
+int	spc_parse_cdb(struct se_cmd *cmd, unsigned int *size);
 
 void	transport_set_vpd_proto_id(struct t10_vpd *, unsigned char *);
 int	transport_set_vpd_assoc(struct t10_vpd *, unsigned char *);