/*
   * 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 <nab@kernel.org>
   *
   * 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_transport.h>
  #include <target/target_core_fabric_ops.h>
  #include "target_core_ua.h"

  #include "target_core_cdb.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)
  {

  	struct se_lun *lun = cmd->se_lun;

  	struct se_device *dev = cmd->se_dev;

  	struct se_portal_group *tpg = lun->lun_sep->sep_tpg;

  	unsigned char *buf;

  
  	/*
  	 * Make sure we at least have 6 bytes of INQUIRY response
  	 * payload going back for EVPD=0
  	 */
  	if (cmd->data_length < 6) {

  		pr_err("SCSI Inquiry payload length: %u"

  			" too small for EVPD=0
  ", cmd->data_length);

  		return -EINVAL;

  	}

  	buf = transport_kmap_first_data_page(cmd);

  	if (dev == tpg->tpg_virt_lun0.lun_se_dev) {
  		buf[0] = 0x3f; /* Not connected */
  	} else {
  		buf[0] = dev->transport->get_device_type(dev);
  		if (buf[0] == TYPE_TAPE)
  			buf[1] = 0x80;
  	}

  	buf[2] = dev->transport->get_device_rev(dev);
  
  	/*
  	 * 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);
  
  	if (cmd->data_length < 8) {
  		buf[4] = 1; /* Set additional length to 1 */

  		goto out;

  	}
  
  	buf[7] = 0x32; /* Sync=1 and CmdQue=1 */
  
  	/*
  	 * Do not include vendor, product, reversion info in INQUIRY
  	 * response payload for cdbs with a small allocation length.
  	 */
  	if (cmd->data_length < 36) {
  		buf[4] = 3; /* Set additional length to 3 */

  		goto out;

  	}
  
  	snprintf((unsigned char *)&buf[8], 8, "LIO-ORG");
  	snprintf((unsigned char *)&buf[16], 16, "%s",

  		 &dev->se_sub_dev->t10_wwn.model[0]);

  	snprintf((unsigned char *)&buf[32], 4, "%s",

  		 &dev->se_sub_dev->t10_wwn.revision[0]);

  	buf[4] = 31; /* Set additional length to 31 */

  
  out:
  	transport_kunmap_first_data_page(cmd);

  	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[0]);

  		unit_serial_len++; /* For NULL Terminator */
  
  		if (((len + 4) + unit_serial_len) > cmd->data_length) {
  			len += unit_serial_len;
  			buf[2] = ((len >> 8) & 0xff);
  			buf[3] = (len & 0xff);
  			return 0;
  		}
  		len += sprintf((unsigned char *)&buf[4], "%s",

  			&dev->se_sub_dev->t10_wwn.unit_serial[0]);

  		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;
  
  	if (off + 20 > cmd->data_length)
  		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 */
  
  		if ((len + (id_len + 4) +
  		    (prod_len + unit_serial_len)) >
  				cmd->data_length) {
  			len += (prod_len + unit_serial_len);
  			goto check_port;
  		}
  		id_len += sprintf((unsigned char *)&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((unsigned char *)&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
  	 */
  check_port:
  	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
  		 */
  		if (((len + 4) + 8) > cmd->data_length) {
  			len += 8;
  			goto check_tpgi;
  		}
  		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
  		 */
  check_tpgi:

  		if (dev->se_sub_dev->t10_alua.alua_type !=

  				SPC3_ALUA_EMULATED)
  			goto check_scsi_name;
  
  		if (((len + 4) + 8) > cmd->data_length) {
  			len += 8;
  			goto check_lu_gp;
  		}
  		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:
  		if (((len + 4) + 8) > cmd->data_length) {
  			len += 8;
  			goto check_scsi_name;
  		}
  		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;
  
  		if (((len + 4) + scsi_name_len) > cmd->data_length) {
  			len += scsi_name_len;
  			goto set_len;
  		}
  		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);
  	}
  set_len:
  	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)
  {
  	if (cmd->data_length < 60)
  		return 0;

  	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;

  	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;
  
  	if (cmd->data_length < (0x10 + 4)) {

  		pr_debug("Received data_length: %u"

  			" too small for EVPD 0xb0
  ",
  			cmd->data_length);

  		return -EINVAL;

  	}
  
  	if (have_tp && cmd->data_length < (0x3c + 4)) {

  		pr_debug("Received data_length: %u"

  			" too small for TPE=1 EVPD 0xb0
  ",
  			cmd->data_length);
  		have_tp = 0;
  	}
  
  	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
  	 */

  	put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.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 or the initiator sent a too
  	 * short buffer.
  	 */
  	if (!have_tp || cmd->data_length < (0x3c + 4))
  		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;
  
  	if (cmd->data_length >= 5 &&
  	    dev->se_sub_dev->se_dev_attrib.is_nonrot)
  		buf[5] = 1;
  
  	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;
  
  	if (cmd->data_length < 8)
  		return 0;
  	/*
  	 * 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 < min_t(int, ARRAY_SIZE(evpd_handlers),
  				      cmd->data_length - 4); ++p)
  			buf[p + 4] = evpd_handlers[p].page;
  	}
  
  	return 0;
  }

  int target_emulate_inquiry(struct se_task *task)

  {

  	struct se_cmd *cmd = task->task_se_cmd;

  	struct se_device *dev = cmd->se_dev;

  	unsigned char *buf;

  	unsigned char *cdb = cmd->t_task_cdb;

  	int p, ret;

  	if (!(cdb[1] & 0x1)) {
  		ret = target_emulate_inquiry_std(cmd);
  		goto out;
  	}

  
  	/*
  	 * Make sure we at least have 4 bytes of INQUIRY response
  	 * payload for 0x00 going back for EVPD=1.  Note that 0x80
  	 * and 0x83 will check for enough payload data length and
  	 * jump to set_len: label when there is not enough inquiry EVPD
  	 * payload length left for the next outgoing EVPD metadata
  	 */
  	if (cmd->data_length < 4) {

  		pr_err("SCSI Inquiry payload length: %u"

  			" too small for EVPD=1
  ", cmd->data_length);

  		cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;

  		return -EINVAL;

  	}

  
  	buf = transport_kmap_first_data_page(cmd);

  	buf[0] = dev->transport->get_device_type(dev);

  	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_unmap;

  		}

  	}

  	pr_err("Unknown VPD Code: 0x%02x
  ", cdb[2]);

  	cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;

  	ret = -EINVAL;
  
  out_unmap:
  	transport_kunmap_first_data_page(cmd);
  out:
  	if (!ret) {
  		task->task_scsi_status = GOOD;
  		transport_complete_task(task, 1);
  	}
  	return ret;

  }

  int target_emulate_readcapacity(struct se_task *task)

  {

  	struct se_cmd *cmd = task->task_se_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_first_data_page(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;

  	/*
  	 * Set max 32-bit blocks to signal SERVICE ACTION READ_CAPACITY_16
  	*/

  	if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)

  		put_unaligned_be32(0xFFFFFFFF, &buf[0]);

  	transport_kunmap_first_data_page(cmd);

  	task->task_scsi_status = GOOD;
  	transport_complete_task(task, 1);

  	return 0;
  }

  int target_emulate_readcapacity_16(struct se_task *task)

  {

  	struct se_cmd *cmd = task->task_se_cmd;

  	struct se_device *dev = cmd->se_dev;

  	unsigned char *buf;

  	unsigned long long blocks = dev->transport->get_blocks(dev);

  	buf = transport_kmap_first_data_page(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_first_data_page(cmd);

  	task->task_scsi_status = GOOD;
  	transport_complete_task(task, 1);

  	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_task *task)

  {

  	struct se_cmd *cmd = task->task_se_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
  ",
  		       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_first_data_page(cmd);

  	memcpy(rbuf, buf, offset);

  	transport_kunmap_first_data_page(cmd);

  	task->task_scsi_status = GOOD;
  	transport_complete_task(task, 1);

  	return 0;
  }

  int target_emulate_request_sense(struct se_task *task)

  {

  	struct se_cmd *cmd = task->task_se_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
  ");

  		cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
  		return -ENOSYS;

  	}

  
  	buf = transport_kmap_first_data_page(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;
  		/*
  		 * Make sure request data length is enough for additional
  		 * sense data.
  		 */
  		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;
  		/*
  		 * Make sure request data length is enough for additional
  		 * sense data.
  		 */
  		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_first_data_page(cmd);

  	task->task_scsi_status = GOOD;
  	transport_complete_task(task, 1);

  	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_task *task)

  {

  	struct se_cmd *cmd = task->task_se_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
  ",
  				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_first_data_page(cmd);

  	ptr = &buf[offset];

  	pr_debug("UNMAP: Sub: %s Using dl: %hu bd_dl: %hu size: %hu"

  		" ptr: %p
  ", 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
  ",

  				 (unsigned long long)lba, range);
  
  		ret = dev->transport->do_discard(dev, lba, range);
  		if (ret < 0) {

  			pr_err("blkdev_issue_discard() failed: %d
  ",

  					ret);

  			goto err;

  		}
  
  		ptr += 16;
  		size -= 16;
  	}

  err:
  	transport_kunmap_first_data_page(cmd);

  	if (!ret) {
  		task->task_scsi_status = GOOD;
  		transport_complete_task(task, 1);
  	}

  	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_task *task)

  {

  	struct se_cmd *cmd = task->task_se_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
  ", 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);

  	pr_debug("WRITE_SAME UNMAP: LBA: %llu Range: %llu
  ",

  		 (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
  ");

  		return ret;

  	}

  	task->task_scsi_status = GOOD;
  	transport_complete_task(task, 1);

  	return 0;
  }

  int target_emulate_synchronize_cache(struct se_task *task)

  {
  	struct se_device *dev = task->task_se_cmd->se_dev;

  	struct se_cmd *cmd = task->task_se_cmd;

  
  	if (!dev->transport->do_sync_cache) {
  		pr_err("SYNCHRONIZE_CACHE emulation not supported"
  			" for: %s
  ", dev->transport->name);

  		cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
  		return -ENOSYS;

  	}
  
  	dev->transport->do_sync_cache(task);
  	return 0;
  }

  int target_emulate_noop(struct se_task *task)

  {
  	task->task_scsi_status = GOOD;
  	transport_complete_task(task, 1);
  	return 0;
  }

  /*
   * Write a CDB into @cdb that is based on the one the intiator sent us,
   * but updated to only cover the sectors that the current task handles.
   */
  void target_get_task_cdb(struct se_task *task, unsigned char *cdb)
  {
  	struct se_cmd *cmd = task->task_se_cmd;

  	unsigned int cdb_len = scsi_command_size(cmd->t_task_cdb);

  	memcpy(cdb, cmd->t_task_cdb, cdb_len);

  	if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {

  		unsigned long long lba = task->task_lba;
  		u32 sectors = task->task_sectors;
  
  		switch (cdb_len) {
  		case 6:
  			/* 21-bit LBA and 8-bit sectors */
  			cdb[1] = (lba >> 16) & 0x1f;
  			cdb[2] = (lba >> 8) & 0xff;
  			cdb[3] = lba & 0xff;
  			cdb[4] = sectors & 0xff;
  			break;
  		case 10:
  			/* 32-bit LBA and 16-bit sectors */
  			put_unaligned_be32(lba, &cdb[2]);
  			put_unaligned_be16(sectors, &cdb[7]);
  			break;
  		case 12:
  			/* 32-bit LBA and 32-bit sectors */
  			put_unaligned_be32(lba, &cdb[2]);
  			put_unaligned_be32(sectors, &cdb[6]);
  			break;
  		case 16:
  			/* 64-bit LBA and 32-bit sectors */
  			put_unaligned_be64(lba, &cdb[2]);
  			put_unaligned_be32(sectors, &cdb[10]);
  			break;
  		case 32:
  			/* 64-bit LBA and 32-bit sectors, extended CDB */
  			put_unaligned_be64(lba, &cdb[12]);
  			put_unaligned_be32(sectors, &cdb[28]);
  			break;
  		default:
  			BUG();
  		}

  	}
  }
  EXPORT_SYMBOL(target_get_task_cdb);