target_core_cdb.c revision 5bda90c8f20f0af93375721533f4081a40fa6f41
1/*
2 * CDB emulation for non-READ/WRITE commands.
3 *
4 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
5 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
6 * Copyright (c) 2007-2010 Rising Tide Systems
7 * Copyright (c) 2008-2010 Linux-iSCSI.org
8 *
9 * Nicholas A. Bellinger <nab@kernel.org>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 */
25
26#include <linux/kernel.h>
27#include <linux/module.h>
28#include <asm/unaligned.h>
29#include <scsi/scsi.h>
30
31#include <target/target_core_base.h>
32#include <target/target_core_transport.h>
33#include <target/target_core_fabric_ops.h>
34#include "target_core_ua.h"
35#include "target_core_cdb.h"
36
37static void
38target_fill_alua_data(struct se_port *port, unsigned char *buf)
39{
40	struct t10_alua_tg_pt_gp *tg_pt_gp;
41	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
42
43	/*
44	 * Set SCCS for MAINTENANCE_IN + REPORT_TARGET_PORT_GROUPS.
45	 */
46	buf[5]	= 0x80;
47
48	/*
49	 * Set TPGS field for explict and/or implict ALUA access type
50	 * and opteration.
51	 *
52	 * See spc4r17 section 6.4.2 Table 135
53	 */
54	if (!port)
55		return;
56	tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
57	if (!tg_pt_gp_mem)
58		return;
59
60	spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
61	tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
62	if (tg_pt_gp)
63		buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type;
64	spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
65}
66
67static int
68target_emulate_inquiry_std(struct se_cmd *cmd)
69{
70	struct se_lun *lun = cmd->se_lun;
71	struct se_device *dev = cmd->se_dev;
72	struct se_portal_group *tpg = lun->lun_sep->sep_tpg;
73	unsigned char *buf;
74
75	/*
76	 * Make sure we at least have 6 bytes of INQUIRY response
77	 * payload going back for EVPD=0
78	 */
79	if (cmd->data_length < 6) {
80		pr_err("SCSI Inquiry payload length: %u"
81			" too small for EVPD=0\n", cmd->data_length);
82		return -EINVAL;
83	}
84
85	buf = transport_kmap_first_data_page(cmd);
86
87	if (dev == tpg->tpg_virt_lun0.lun_se_dev) {
88		buf[0] = 0x3f; /* Not connected */
89	} else {
90		buf[0] = dev->transport->get_device_type(dev);
91		if (buf[0] == TYPE_TAPE)
92			buf[1] = 0x80;
93	}
94	buf[2] = dev->transport->get_device_rev(dev);
95
96	/*
97	 * Enable SCCS and TPGS fields for Emulated ALUA
98	 */
99	if (dev->se_sub_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED)
100		target_fill_alua_data(lun->lun_sep, buf);
101
102	if (cmd->data_length < 8) {
103		buf[4] = 1; /* Set additional length to 1 */
104		goto out;
105	}
106
107	buf[7] = 0x32; /* Sync=1 and CmdQue=1 */
108
109	/*
110	 * Do not include vendor, product, reversion info in INQUIRY
111	 * response payload for cdbs with a small allocation length.
112	 */
113	if (cmd->data_length < 36) {
114		buf[4] = 3; /* Set additional length to 3 */
115		goto out;
116	}
117
118	snprintf((unsigned char *)&buf[8], 8, "LIO-ORG");
119	snprintf((unsigned char *)&buf[16], 16, "%s",
120		 &dev->se_sub_dev->t10_wwn.model[0]);
121	snprintf((unsigned char *)&buf[32], 4, "%s",
122		 &dev->se_sub_dev->t10_wwn.revision[0]);
123	buf[4] = 31; /* Set additional length to 31 */
124
125out:
126	transport_kunmap_first_data_page(cmd);
127	return 0;
128}
129
130/* unit serial number */
131static int
132target_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf)
133{
134	struct se_device *dev = cmd->se_dev;
135	u16 len = 0;
136
137	if (dev->se_sub_dev->su_dev_flags &
138			SDF_EMULATED_VPD_UNIT_SERIAL) {
139		u32 unit_serial_len;
140
141		unit_serial_len =
142			strlen(&dev->se_sub_dev->t10_wwn.unit_serial[0]);
143		unit_serial_len++; /* For NULL Terminator */
144
145		if (((len + 4) + unit_serial_len) > cmd->data_length) {
146			len += unit_serial_len;
147			buf[2] = ((len >> 8) & 0xff);
148			buf[3] = (len & 0xff);
149			return 0;
150		}
151		len += sprintf((unsigned char *)&buf[4], "%s",
152			&dev->se_sub_dev->t10_wwn.unit_serial[0]);
153		len++; /* Extra Byte for NULL Terminator */
154		buf[3] = len;
155	}
156	return 0;
157}
158
159static void
160target_parse_naa_6h_vendor_specific(struct se_device *dev, unsigned char *buf)
161{
162	unsigned char *p = &dev->se_sub_dev->t10_wwn.unit_serial[0];
163	int cnt;
164	bool next = true;
165
166	/*
167	 * Generate up to 36 bits of VENDOR SPECIFIC IDENTIFIER starting on
168	 * byte 3 bit 3-0 for NAA IEEE Registered Extended DESIGNATOR field
169	 * format, followed by 64 bits of VENDOR SPECIFIC IDENTIFIER EXTENSION
170	 * to complete the payload.  These are based from VPD=0x80 PRODUCT SERIAL
171	 * NUMBER set via vpd_unit_serial in target_core_configfs.c to ensure
172	 * per device uniqeness.
173	 */
174	for (cnt = 0; *p && cnt < 13; p++) {
175		int val = hex_to_bin(*p);
176
177		if (val < 0)
178			continue;
179
180		if (next) {
181			next = false;
182			buf[cnt++] |= val;
183		} else {
184			next = true;
185			buf[cnt] = val << 4;
186		}
187	}
188}
189
190/*
191 * Device identification VPD, for a complete list of
192 * DESIGNATOR TYPEs see spc4r17 Table 459.
193 */
194static int
195target_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf)
196{
197	struct se_device *dev = cmd->se_dev;
198	struct se_lun *lun = cmd->se_lun;
199	struct se_port *port = NULL;
200	struct se_portal_group *tpg = NULL;
201	struct t10_alua_lu_gp_member *lu_gp_mem;
202	struct t10_alua_tg_pt_gp *tg_pt_gp;
203	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
204	unsigned char *prod = &dev->se_sub_dev->t10_wwn.model[0];
205	u32 prod_len;
206	u32 unit_serial_len, off = 0;
207	u16 len = 0, id_len;
208
209	off = 4;
210
211	/*
212	 * NAA IEEE Registered Extended Assigned designator format, see
213	 * spc4r17 section 7.7.3.6.5
214	 *
215	 * We depend upon a target_core_mod/ConfigFS provided
216	 * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial
217	 * value in order to return the NAA id.
218	 */
219	if (!(dev->se_sub_dev->su_dev_flags & SDF_EMULATED_VPD_UNIT_SERIAL))
220		goto check_t10_vend_desc;
221
222	if (off + 20 > cmd->data_length)
223		goto check_t10_vend_desc;
224
225	/* CODE SET == Binary */
226	buf[off++] = 0x1;
227
228	/* Set ASSOCIATION == addressed logical unit: 0)b */
229	buf[off] = 0x00;
230
231	/* Identifier/Designator type == NAA identifier */
232	buf[off++] |= 0x3;
233	off++;
234
235	/* Identifier/Designator length */
236	buf[off++] = 0x10;
237
238	/*
239	 * Start NAA IEEE Registered Extended Identifier/Designator
240	 */
241	buf[off++] = (0x6 << 4);
242
243	/*
244	 * Use OpenFabrics IEEE Company ID: 00 14 05
245	 */
246	buf[off++] = 0x01;
247	buf[off++] = 0x40;
248	buf[off] = (0x5 << 4);
249
250	/*
251	 * Return ConfigFS Unit Serial Number information for
252	 * VENDOR_SPECIFIC_IDENTIFIER and
253	 * VENDOR_SPECIFIC_IDENTIFIER_EXTENTION
254	 */
255	target_parse_naa_6h_vendor_specific(dev, &buf[off]);
256
257	len = 20;
258	off = (len + 4);
259
260check_t10_vend_desc:
261	/*
262	 * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4
263	 */
264	id_len = 8; /* For Vendor field */
265	prod_len = 4; /* For VPD Header */
266	prod_len += 8; /* For Vendor field */
267	prod_len += strlen(prod);
268	prod_len++; /* For : */
269
270	if (dev->se_sub_dev->su_dev_flags &
271			SDF_EMULATED_VPD_UNIT_SERIAL) {
272		unit_serial_len =
273			strlen(&dev->se_sub_dev->t10_wwn.unit_serial[0]);
274		unit_serial_len++; /* For NULL Terminator */
275
276		if ((len + (id_len + 4) +
277		    (prod_len + unit_serial_len)) >
278				cmd->data_length) {
279			len += (prod_len + unit_serial_len);
280			goto check_port;
281		}
282		id_len += sprintf((unsigned char *)&buf[off+12],
283				"%s:%s", prod,
284				&dev->se_sub_dev->t10_wwn.unit_serial[0]);
285	}
286	buf[off] = 0x2; /* ASCII */
287	buf[off+1] = 0x1; /* T10 Vendor ID */
288	buf[off+2] = 0x0;
289	memcpy((unsigned char *)&buf[off+4], "LIO-ORG", 8);
290	/* Extra Byte for NULL Terminator */
291	id_len++;
292	/* Identifier Length */
293	buf[off+3] = id_len;
294	/* Header size for Designation descriptor */
295	len += (id_len + 4);
296	off += (id_len + 4);
297	/*
298	 * struct se_port is only set for INQUIRY VPD=1 through $FABRIC_MOD
299	 */
300check_port:
301	port = lun->lun_sep;
302	if (port) {
303		struct t10_alua_lu_gp *lu_gp;
304		u32 padding, scsi_name_len;
305		u16 lu_gp_id = 0;
306		u16 tg_pt_gp_id = 0;
307		u16 tpgt;
308
309		tpg = port->sep_tpg;
310		/*
311		 * Relative target port identifer, see spc4r17
312		 * section 7.7.3.7
313		 *
314		 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
315		 * section 7.5.1 Table 362
316		 */
317		if (((len + 4) + 8) > cmd->data_length) {
318			len += 8;
319			goto check_tpgi;
320		}
321		buf[off] =
322			(tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
323		buf[off++] |= 0x1; /* CODE SET == Binary */
324		buf[off] = 0x80; /* Set PIV=1 */
325		/* Set ASSOCIATION == target port: 01b */
326		buf[off] |= 0x10;
327		/* DESIGNATOR TYPE == Relative target port identifer */
328		buf[off++] |= 0x4;
329		off++; /* Skip over Reserved */
330		buf[off++] = 4; /* DESIGNATOR LENGTH */
331		/* Skip over Obsolete field in RTPI payload
332		 * in Table 472 */
333		off += 2;
334		buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
335		buf[off++] = (port->sep_rtpi & 0xff);
336		len += 8; /* Header size + Designation descriptor */
337		/*
338		 * Target port group identifier, see spc4r17
339		 * section 7.7.3.8
340		 *
341		 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
342		 * section 7.5.1 Table 362
343		 */
344check_tpgi:
345		if (dev->se_sub_dev->t10_alua.alua_type !=
346				SPC3_ALUA_EMULATED)
347			goto check_scsi_name;
348
349		if (((len + 4) + 8) > cmd->data_length) {
350			len += 8;
351			goto check_lu_gp;
352		}
353		tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
354		if (!tg_pt_gp_mem)
355			goto check_lu_gp;
356
357		spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
358		tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
359		if (!tg_pt_gp) {
360			spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
361			goto check_lu_gp;
362		}
363		tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id;
364		spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
365
366		buf[off] =
367			(tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
368		buf[off++] |= 0x1; /* CODE SET == Binary */
369		buf[off] = 0x80; /* Set PIV=1 */
370		/* Set ASSOCIATION == target port: 01b */
371		buf[off] |= 0x10;
372		/* DESIGNATOR TYPE == Target port group identifier */
373		buf[off++] |= 0x5;
374		off++; /* Skip over Reserved */
375		buf[off++] = 4; /* DESIGNATOR LENGTH */
376		off += 2; /* Skip over Reserved Field */
377		buf[off++] = ((tg_pt_gp_id >> 8) & 0xff);
378		buf[off++] = (tg_pt_gp_id & 0xff);
379		len += 8; /* Header size + Designation descriptor */
380		/*
381		 * Logical Unit Group identifier, see spc4r17
382		 * section 7.7.3.8
383		 */
384check_lu_gp:
385		if (((len + 4) + 8) > cmd->data_length) {
386			len += 8;
387			goto check_scsi_name;
388		}
389		lu_gp_mem = dev->dev_alua_lu_gp_mem;
390		if (!lu_gp_mem)
391			goto check_scsi_name;
392
393		spin_lock(&lu_gp_mem->lu_gp_mem_lock);
394		lu_gp = lu_gp_mem->lu_gp;
395		if (!lu_gp) {
396			spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
397			goto check_scsi_name;
398		}
399		lu_gp_id = lu_gp->lu_gp_id;
400		spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
401
402		buf[off++] |= 0x1; /* CODE SET == Binary */
403		/* DESIGNATOR TYPE == Logical Unit Group identifier */
404		buf[off++] |= 0x6;
405		off++; /* Skip over Reserved */
406		buf[off++] = 4; /* DESIGNATOR LENGTH */
407		off += 2; /* Skip over Reserved Field */
408		buf[off++] = ((lu_gp_id >> 8) & 0xff);
409		buf[off++] = (lu_gp_id & 0xff);
410		len += 8; /* Header size + Designation descriptor */
411		/*
412		 * SCSI name string designator, see spc4r17
413		 * section 7.7.3.11
414		 *
415		 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
416		 * section 7.5.1 Table 362
417		 */
418check_scsi_name:
419		scsi_name_len = strlen(tpg->se_tpg_tfo->tpg_get_wwn(tpg));
420		/* UTF-8 ",t,0x<16-bit TPGT>" + NULL Terminator */
421		scsi_name_len += 10;
422		/* Check for 4-byte padding */
423		padding = ((-scsi_name_len) & 3);
424		if (padding != 0)
425			scsi_name_len += padding;
426		/* Header size + Designation descriptor */
427		scsi_name_len += 4;
428
429		if (((len + 4) + scsi_name_len) > cmd->data_length) {
430			len += scsi_name_len;
431			goto set_len;
432		}
433		buf[off] =
434			(tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
435		buf[off++] |= 0x3; /* CODE SET == UTF-8 */
436		buf[off] = 0x80; /* Set PIV=1 */
437		/* Set ASSOCIATION == target port: 01b */
438		buf[off] |= 0x10;
439		/* DESIGNATOR TYPE == SCSI name string */
440		buf[off++] |= 0x8;
441		off += 2; /* Skip over Reserved and length */
442		/*
443		 * SCSI name string identifer containing, $FABRIC_MOD
444		 * dependent information.  For LIO-Target and iSCSI
445		 * Target Port, this means "<iSCSI name>,t,0x<TPGT> in
446		 * UTF-8 encoding.
447		 */
448		tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
449		scsi_name_len = sprintf(&buf[off], "%s,t,0x%04x",
450					tpg->se_tpg_tfo->tpg_get_wwn(tpg), tpgt);
451		scsi_name_len += 1 /* Include  NULL terminator */;
452		/*
453		 * The null-terminated, null-padded (see 4.4.2) SCSI
454		 * NAME STRING field contains a UTF-8 format string.
455		 * The number of bytes in the SCSI NAME STRING field
456		 * (i.e., the value in the DESIGNATOR LENGTH field)
457		 * shall be no larger than 256 and shall be a multiple
458		 * of four.
459		 */
460		if (padding)
461			scsi_name_len += padding;
462
463		buf[off-1] = scsi_name_len;
464		off += scsi_name_len;
465		/* Header size + Designation descriptor */
466		len += (scsi_name_len + 4);
467	}
468set_len:
469	buf[2] = ((len >> 8) & 0xff);
470	buf[3] = (len & 0xff); /* Page Length for VPD 0x83 */
471	return 0;
472}
473
474/* Extended INQUIRY Data VPD Page */
475static int
476target_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf)
477{
478	if (cmd->data_length < 60)
479		return 0;
480
481	buf[2] = 0x3c;
482	/* Set HEADSUP, ORDSUP, SIMPSUP */
483	buf[5] = 0x07;
484
485	/* If WriteCache emulation is enabled, set V_SUP */
486	if (cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0)
487		buf[6] = 0x01;
488	return 0;
489}
490
491/* Block Limits VPD page */
492static int
493target_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
494{
495	struct se_device *dev = cmd->se_dev;
496	int have_tp = 0;
497
498	/*
499	 * Following sbc3r22 section 6.5.3 Block Limits VPD page, when
500	 * emulate_tpu=1 or emulate_tpws=1 we will be expect a
501	 * different page length for Thin Provisioning.
502	 */
503	if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
504		have_tp = 1;
505
506	if (cmd->data_length < (0x10 + 4)) {
507		pr_debug("Received data_length: %u"
508			" too small for EVPD 0xb0\n",
509			cmd->data_length);
510		return -EINVAL;
511	}
512
513	if (have_tp && cmd->data_length < (0x3c + 4)) {
514		pr_debug("Received data_length: %u"
515			" too small for TPE=1 EVPD 0xb0\n",
516			cmd->data_length);
517		have_tp = 0;
518	}
519
520	buf[0] = dev->transport->get_device_type(dev);
521	buf[3] = have_tp ? 0x3c : 0x10;
522
523	/* Set WSNZ to 1 */
524	buf[4] = 0x01;
525
526	/*
527	 * Set OPTIMAL TRANSFER LENGTH GRANULARITY
528	 */
529	put_unaligned_be16(1, &buf[6]);
530
531	/*
532	 * Set MAXIMUM TRANSFER LENGTH
533	 */
534	put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_sectors, &buf[8]);
535
536	/*
537	 * Set OPTIMAL TRANSFER LENGTH
538	 */
539	put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.optimal_sectors, &buf[12]);
540
541	/*
542	 * Exit now if we don't support TP or the initiator sent a too
543	 * short buffer.
544	 */
545	if (!have_tp || cmd->data_length < (0x3c + 4))
546		return 0;
547
548	/*
549	 * Set MAXIMUM UNMAP LBA COUNT
550	 */
551	put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count, &buf[20]);
552
553	/*
554	 * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT
555	 */
556	put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count,
557			   &buf[24]);
558
559	/*
560	 * Set OPTIMAL UNMAP GRANULARITY
561	 */
562	put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.unmap_granularity, &buf[28]);
563
564	/*
565	 * UNMAP GRANULARITY ALIGNMENT
566	 */
567	put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment,
568			   &buf[32]);
569	if (dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment != 0)
570		buf[32] |= 0x80; /* Set the UGAVALID bit */
571
572	return 0;
573}
574
575/* Block Device Characteristics VPD page */
576static int
577target_emulate_evpd_b1(struct se_cmd *cmd, unsigned char *buf)
578{
579	struct se_device *dev = cmd->se_dev;
580
581	buf[0] = dev->transport->get_device_type(dev);
582	buf[3] = 0x3c;
583
584	if (cmd->data_length >= 5 &&
585	    dev->se_sub_dev->se_dev_attrib.is_nonrot)
586		buf[5] = 1;
587
588	return 0;
589}
590
591/* Thin Provisioning VPD */
592static int
593target_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf)
594{
595	struct se_device *dev = cmd->se_dev;
596
597	/*
598	 * From sbc3r22 section 6.5.4 Thin Provisioning VPD page:
599	 *
600	 * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to
601	 * zero, then the page length shall be set to 0004h.  If the DP bit
602	 * is set to one, then the page length shall be set to the value
603	 * defined in table 162.
604	 */
605	buf[0] = dev->transport->get_device_type(dev);
606
607	/*
608	 * Set Hardcoded length mentioned above for DP=0
609	 */
610	put_unaligned_be16(0x0004, &buf[2]);
611
612	/*
613	 * The THRESHOLD EXPONENT field indicates the threshold set size in
614	 * LBAs as a power of 2 (i.e., the threshold set size is equal to
615	 * 2(threshold exponent)).
616	 *
617	 * Note that this is currently set to 0x00 as mkp says it will be
618	 * changing again.  We can enable this once it has settled in T10
619	 * and is actually used by Linux/SCSI ML code.
620	 */
621	buf[4] = 0x00;
622
623	/*
624	 * A TPU bit set to one indicates that the device server supports
625	 * the UNMAP command (see 5.25). A TPU bit set to zero indicates
626	 * that the device server does not support the UNMAP command.
627	 */
628	if (dev->se_sub_dev->se_dev_attrib.emulate_tpu != 0)
629		buf[5] = 0x80;
630
631	/*
632	 * A TPWS bit set to one indicates that the device server supports
633	 * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs.
634	 * A TPWS bit set to zero indicates that the device server does not
635	 * support the use of the WRITE SAME (16) command to unmap LBAs.
636	 */
637	if (dev->se_sub_dev->se_dev_attrib.emulate_tpws != 0)
638		buf[5] |= 0x40;
639
640	return 0;
641}
642
643static int
644target_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf);
645
646static struct {
647	uint8_t		page;
648	int		(*emulate)(struct se_cmd *, unsigned char *);
649} evpd_handlers[] = {
650	{ .page = 0x00, .emulate = target_emulate_evpd_00 },
651	{ .page = 0x80, .emulate = target_emulate_evpd_80 },
652	{ .page = 0x83, .emulate = target_emulate_evpd_83 },
653	{ .page = 0x86, .emulate = target_emulate_evpd_86 },
654	{ .page = 0xb0, .emulate = target_emulate_evpd_b0 },
655	{ .page = 0xb1, .emulate = target_emulate_evpd_b1 },
656	{ .page = 0xb2, .emulate = target_emulate_evpd_b2 },
657};
658
659/* supported vital product data pages */
660static int
661target_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf)
662{
663	int p;
664
665	if (cmd->data_length < 8)
666		return 0;
667	/*
668	 * Only report the INQUIRY EVPD=1 pages after a valid NAA
669	 * Registered Extended LUN WWN has been set via ConfigFS
670	 * during device creation/restart.
671	 */
672	if (cmd->se_dev->se_sub_dev->su_dev_flags &
673			SDF_EMULATED_VPD_UNIT_SERIAL) {
674		buf[3] = ARRAY_SIZE(evpd_handlers);
675		for (p = 0; p < min_t(int, ARRAY_SIZE(evpd_handlers),
676				      cmd->data_length - 4); ++p)
677			buf[p + 4] = evpd_handlers[p].page;
678	}
679
680	return 0;
681}
682
683int target_emulate_inquiry(struct se_task *task)
684{
685	struct se_cmd *cmd = task->task_se_cmd;
686	struct se_device *dev = cmd->se_dev;
687	unsigned char *buf;
688	unsigned char *cdb = cmd->t_task_cdb;
689	int p, ret;
690
691	if (!(cdb[1] & 0x1)) {
692		ret = target_emulate_inquiry_std(cmd);
693		goto out;
694	}
695
696	/*
697	 * Make sure we at least have 4 bytes of INQUIRY response
698	 * payload for 0x00 going back for EVPD=1.  Note that 0x80
699	 * and 0x83 will check for enough payload data length and
700	 * jump to set_len: label when there is not enough inquiry EVPD
701	 * payload length left for the next outgoing EVPD metadata
702	 */
703	if (cmd->data_length < 4) {
704		pr_err("SCSI Inquiry payload length: %u"
705			" too small for EVPD=1\n", cmd->data_length);
706		return -EINVAL;
707	}
708
709	buf = transport_kmap_first_data_page(cmd);
710
711	buf[0] = dev->transport->get_device_type(dev);
712
713	for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) {
714		if (cdb[2] == evpd_handlers[p].page) {
715			buf[1] = cdb[2];
716			ret = evpd_handlers[p].emulate(cmd, buf);
717			goto out_unmap;
718		}
719	}
720
721	pr_err("Unknown VPD Code: 0x%02x\n", cdb[2]);
722	ret = -EINVAL;
723
724out_unmap:
725	transport_kunmap_first_data_page(cmd);
726out:
727	if (!ret) {
728		task->task_scsi_status = GOOD;
729		transport_complete_task(task, 1);
730	}
731	return ret;
732}
733
734int target_emulate_readcapacity(struct se_task *task)
735{
736	struct se_cmd *cmd = task->task_se_cmd;
737	struct se_device *dev = cmd->se_dev;
738	unsigned char *buf;
739	unsigned long long blocks_long = dev->transport->get_blocks(dev);
740	u32 blocks;
741
742	if (blocks_long >= 0x00000000ffffffff)
743		blocks = 0xffffffff;
744	else
745		blocks = (u32)blocks_long;
746
747	buf = transport_kmap_first_data_page(cmd);
748
749	buf[0] = (blocks >> 24) & 0xff;
750	buf[1] = (blocks >> 16) & 0xff;
751	buf[2] = (blocks >> 8) & 0xff;
752	buf[3] = blocks & 0xff;
753	buf[4] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff;
754	buf[5] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff;
755	buf[6] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff;
756	buf[7] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff;
757	/*
758	 * Set max 32-bit blocks to signal SERVICE ACTION READ_CAPACITY_16
759	*/
760	if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
761		put_unaligned_be32(0xFFFFFFFF, &buf[0]);
762
763	transport_kunmap_first_data_page(cmd);
764
765	task->task_scsi_status = GOOD;
766	transport_complete_task(task, 1);
767	return 0;
768}
769
770int target_emulate_readcapacity_16(struct se_task *task)
771{
772	struct se_cmd *cmd = task->task_se_cmd;
773	struct se_device *dev = cmd->se_dev;
774	unsigned char *buf;
775	unsigned long long blocks = dev->transport->get_blocks(dev);
776
777	buf = transport_kmap_first_data_page(cmd);
778
779	buf[0] = (blocks >> 56) & 0xff;
780	buf[1] = (blocks >> 48) & 0xff;
781	buf[2] = (blocks >> 40) & 0xff;
782	buf[3] = (blocks >> 32) & 0xff;
783	buf[4] = (blocks >> 24) & 0xff;
784	buf[5] = (blocks >> 16) & 0xff;
785	buf[6] = (blocks >> 8) & 0xff;
786	buf[7] = blocks & 0xff;
787	buf[8] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff;
788	buf[9] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff;
789	buf[10] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff;
790	buf[11] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff;
791	/*
792	 * Set Thin Provisioning Enable bit following sbc3r22 in section
793	 * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
794	 */
795	if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
796		buf[14] = 0x80;
797
798	transport_kunmap_first_data_page(cmd);
799
800	task->task_scsi_status = GOOD;
801	transport_complete_task(task, 1);
802	return 0;
803}
804
805static int
806target_modesense_rwrecovery(unsigned char *p)
807{
808	p[0] = 0x01;
809	p[1] = 0x0a;
810
811	return 12;
812}
813
814static int
815target_modesense_control(struct se_device *dev, unsigned char *p)
816{
817	p[0] = 0x0a;
818	p[1] = 0x0a;
819	p[2] = 2;
820	/*
821	 * From spc4r23, 7.4.7 Control mode page
822	 *
823	 * The QUEUE ALGORITHM MODIFIER field (see table 368) specifies
824	 * restrictions on the algorithm used for reordering commands
825	 * having the SIMPLE task attribute (see SAM-4).
826	 *
827	 *                    Table 368 -- QUEUE ALGORITHM MODIFIER field
828	 *                         Code      Description
829	 *                          0h       Restricted reordering
830	 *                          1h       Unrestricted reordering allowed
831	 *                          2h to 7h    Reserved
832	 *                          8h to Fh    Vendor specific
833	 *
834	 * A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that
835	 * the device server shall order the processing sequence of commands
836	 * having the SIMPLE task attribute such that data integrity is maintained
837	 * for that I_T nexus (i.e., if the transmission of new SCSI transport protocol
838	 * requests is halted at any time, the final value of all data observable
839	 * on the medium shall be the same as if all the commands had been processed
840	 * with the ORDERED task attribute).
841	 *
842	 * A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the
843	 * device server may reorder the processing sequence of commands having the
844	 * SIMPLE task attribute in any manner. Any data integrity exposures related to
845	 * command sequence order shall be explicitly handled by the application client
846	 * through the selection of appropriate ommands and task attributes.
847	 */
848	p[3] = (dev->se_sub_dev->se_dev_attrib.emulate_rest_reord == 1) ? 0x00 : 0x10;
849	/*
850	 * From spc4r17, section 7.4.6 Control mode Page
851	 *
852	 * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b
853	 *
854	 * 00b: The logical unit shall clear any unit attention condition
855	 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
856	 * status and shall not establish a unit attention condition when a com-
857	 * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT
858	 * status.
859	 *
860	 * 10b: The logical unit shall not clear any unit attention condition
861	 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
862	 * status and shall not establish a unit attention condition when
863	 * a command is completed with BUSY, TASK SET FULL, or RESERVATION
864	 * CONFLICT status.
865	 *
866	 * 11b a The logical unit shall not clear any unit attention condition
867	 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
868	 * status and shall establish a unit attention condition for the
869	 * initiator port associated with the I_T nexus on which the BUSY,
870	 * TASK SET FULL, or RESERVATION CONFLICT status is being returned.
871	 * Depending on the status, the additional sense code shall be set to
872	 * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS
873	 * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE
874	 * command, a unit attention condition shall be established only once
875	 * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless
876	 * to the number of commands completed with one of those status codes.
877	 */
878	p[4] = (dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2) ? 0x30 :
879	       (dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 1) ? 0x20 : 0x00;
880	/*
881	 * From spc4r17, section 7.4.6 Control mode Page
882	 *
883	 * Task Aborted Status (TAS) bit set to zero.
884	 *
885	 * A task aborted status (TAS) bit set to zero specifies that aborted
886	 * tasks shall be terminated by the device server without any response
887	 * to the application client. A TAS bit set to one specifies that tasks
888	 * aborted by the actions of an I_T nexus other than the I_T nexus on
889	 * which the command was received shall be completed with TASK ABORTED
890	 * status (see SAM-4).
891	 */
892	p[5] = (dev->se_sub_dev->se_dev_attrib.emulate_tas) ? 0x40 : 0x00;
893	p[8] = 0xff;
894	p[9] = 0xff;
895	p[11] = 30;
896
897	return 12;
898}
899
900static int
901target_modesense_caching(struct se_device *dev, unsigned char *p)
902{
903	p[0] = 0x08;
904	p[1] = 0x12;
905	if (dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0)
906		p[2] = 0x04; /* Write Cache Enable */
907	p[12] = 0x20; /* Disabled Read Ahead */
908
909	return 20;
910}
911
912static void
913target_modesense_write_protect(unsigned char *buf, int type)
914{
915	/*
916	 * I believe that the WP bit (bit 7) in the mode header is the same for
917	 * all device types..
918	 */
919	switch (type) {
920	case TYPE_DISK:
921	case TYPE_TAPE:
922	default:
923		buf[0] |= 0x80; /* WP bit */
924		break;
925	}
926}
927
928static void
929target_modesense_dpofua(unsigned char *buf, int type)
930{
931	switch (type) {
932	case TYPE_DISK:
933		buf[0] |= 0x10; /* DPOFUA bit */
934		break;
935	default:
936		break;
937	}
938}
939
940int target_emulate_modesense(struct se_task *task)
941{
942	struct se_cmd *cmd = task->task_se_cmd;
943	struct se_device *dev = cmd->se_dev;
944	char *cdb = cmd->t_task_cdb;
945	unsigned char *rbuf;
946	int type = dev->transport->get_device_type(dev);
947	int ten = (cmd->t_task_cdb[0] == MODE_SENSE_10);
948	int offset = ten ? 8 : 4;
949	int length = 0;
950	unsigned char buf[SE_MODE_PAGE_BUF];
951
952	memset(buf, 0, SE_MODE_PAGE_BUF);
953
954	switch (cdb[2] & 0x3f) {
955	case 0x01:
956		length = target_modesense_rwrecovery(&buf[offset]);
957		break;
958	case 0x08:
959		length = target_modesense_caching(dev, &buf[offset]);
960		break;
961	case 0x0a:
962		length = target_modesense_control(dev, &buf[offset]);
963		break;
964	case 0x3f:
965		length = target_modesense_rwrecovery(&buf[offset]);
966		length += target_modesense_caching(dev, &buf[offset+length]);
967		length += target_modesense_control(dev, &buf[offset+length]);
968		break;
969	default:
970		pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n",
971		       cdb[2] & 0x3f, cdb[3]);
972		return PYX_TRANSPORT_UNKNOWN_MODE_PAGE;
973	}
974	offset += length;
975
976	if (ten) {
977		offset -= 2;
978		buf[0] = (offset >> 8) & 0xff;
979		buf[1] = offset & 0xff;
980
981		if ((cmd->se_lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) ||
982		    (cmd->se_deve &&
983		    (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)))
984			target_modesense_write_protect(&buf[3], type);
985
986		if ((dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0) &&
987		    (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0))
988			target_modesense_dpofua(&buf[3], type);
989
990		if ((offset + 2) > cmd->data_length)
991			offset = cmd->data_length;
992
993	} else {
994		offset -= 1;
995		buf[0] = offset & 0xff;
996
997		if ((cmd->se_lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) ||
998		    (cmd->se_deve &&
999		    (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)))
1000			target_modesense_write_protect(&buf[2], type);
1001
1002		if ((dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0) &&
1003		    (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0))
1004			target_modesense_dpofua(&buf[2], type);
1005
1006		if ((offset + 1) > cmd->data_length)
1007			offset = cmd->data_length;
1008	}
1009
1010	rbuf = transport_kmap_first_data_page(cmd);
1011	memcpy(rbuf, buf, offset);
1012	transport_kunmap_first_data_page(cmd);
1013
1014	task->task_scsi_status = GOOD;
1015	transport_complete_task(task, 1);
1016	return 0;
1017}
1018
1019int target_emulate_request_sense(struct se_task *task)
1020{
1021	struct se_cmd *cmd = task->task_se_cmd;
1022	unsigned char *cdb = cmd->t_task_cdb;
1023	unsigned char *buf;
1024	u8 ua_asc = 0, ua_ascq = 0;
1025	int err = 0;
1026
1027	if (cdb[1] & 0x01) {
1028		pr_err("REQUEST_SENSE description emulation not"
1029			" supported\n");
1030		return PYX_TRANSPORT_INVALID_CDB_FIELD;
1031	}
1032
1033	buf = transport_kmap_first_data_page(cmd);
1034
1035	if (!core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq)) {
1036		/*
1037		 * CURRENT ERROR, UNIT ATTENTION
1038		 */
1039		buf[0] = 0x70;
1040		buf[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
1041		/*
1042		 * Make sure request data length is enough for additional
1043		 * sense data.
1044		 */
1045		if (cmd->data_length <= 18) {
1046			buf[7] = 0x00;
1047			err = -EINVAL;
1048			goto end;
1049		}
1050		/*
1051		 * The Additional Sense Code (ASC) from the UNIT ATTENTION
1052		 */
1053		buf[SPC_ASC_KEY_OFFSET] = ua_asc;
1054		buf[SPC_ASCQ_KEY_OFFSET] = ua_ascq;
1055		buf[7] = 0x0A;
1056	} else {
1057		/*
1058		 * CURRENT ERROR, NO SENSE
1059		 */
1060		buf[0] = 0x70;
1061		buf[SPC_SENSE_KEY_OFFSET] = NO_SENSE;
1062		/*
1063		 * Make sure request data length is enough for additional
1064		 * sense data.
1065		 */
1066		if (cmd->data_length <= 18) {
1067			buf[7] = 0x00;
1068			err = -EINVAL;
1069			goto end;
1070		}
1071		/*
1072		 * NO ADDITIONAL SENSE INFORMATION
1073		 */
1074		buf[SPC_ASC_KEY_OFFSET] = 0x00;
1075		buf[7] = 0x0A;
1076	}
1077
1078end:
1079	transport_kunmap_first_data_page(cmd);
1080	task->task_scsi_status = GOOD;
1081	transport_complete_task(task, 1);
1082	return 0;
1083}
1084
1085/*
1086 * Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support.
1087 * Note this is not used for TCM/pSCSI passthrough
1088 */
1089int target_emulate_unmap(struct se_task *task)
1090{
1091	struct se_cmd *cmd = task->task_se_cmd;
1092	struct se_device *dev = cmd->se_dev;
1093	unsigned char *buf, *ptr = NULL;
1094	unsigned char *cdb = &cmd->t_task_cdb[0];
1095	sector_t lba;
1096	unsigned int size = cmd->data_length, range;
1097	int ret = 0, offset;
1098	unsigned short dl, bd_dl;
1099
1100	if (!dev->transport->do_discard) {
1101		pr_err("UNMAP emulation not supported for: %s\n",
1102				dev->transport->name);
1103		return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1104	}
1105
1106	/* First UNMAP block descriptor starts at 8 byte offset */
1107	offset = 8;
1108	size -= 8;
1109	dl = get_unaligned_be16(&cdb[0]);
1110	bd_dl = get_unaligned_be16(&cdb[2]);
1111
1112	buf = transport_kmap_first_data_page(cmd);
1113
1114	ptr = &buf[offset];
1115	pr_debug("UNMAP: Sub: %s Using dl: %hu bd_dl: %hu size: %hu"
1116		" ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
1117
1118	while (size) {
1119		lba = get_unaligned_be64(&ptr[0]);
1120		range = get_unaligned_be32(&ptr[8]);
1121		pr_debug("UNMAP: Using lba: %llu and range: %u\n",
1122				 (unsigned long long)lba, range);
1123
1124		ret = dev->transport->do_discard(dev, lba, range);
1125		if (ret < 0) {
1126			pr_err("blkdev_issue_discard() failed: %d\n",
1127					ret);
1128			goto err;
1129		}
1130
1131		ptr += 16;
1132		size -= 16;
1133	}
1134
1135err:
1136	transport_kunmap_first_data_page(cmd);
1137	if (!ret) {
1138		task->task_scsi_status = GOOD;
1139		transport_complete_task(task, 1);
1140	}
1141	return ret;
1142}
1143
1144/*
1145 * Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support.
1146 * Note this is not used for TCM/pSCSI passthrough
1147 */
1148int target_emulate_write_same(struct se_task *task)
1149{
1150	struct se_cmd *cmd = task->task_se_cmd;
1151	struct se_device *dev = cmd->se_dev;
1152	sector_t range;
1153	sector_t lba = cmd->t_task_lba;
1154	u32 num_blocks;
1155	int ret;
1156
1157	if (!dev->transport->do_discard) {
1158		pr_err("WRITE_SAME emulation not supported"
1159				" for: %s\n", dev->transport->name);
1160		return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1161	}
1162
1163	if (cmd->t_task_cdb[0] == WRITE_SAME)
1164		num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]);
1165	else if (cmd->t_task_cdb[0] == WRITE_SAME_16)
1166		num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]);
1167	else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */
1168		num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]);
1169
1170	/*
1171	 * Use the explicit range when non zero is supplied, otherwise calculate
1172	 * the remaining range based on ->get_blocks() - starting LBA.
1173	 */
1174	if (num_blocks != 0)
1175		range = num_blocks;
1176	else
1177		range = (dev->transport->get_blocks(dev) - lba);
1178
1179	pr_debug("WRITE_SAME UNMAP: LBA: %llu Range: %llu\n",
1180		 (unsigned long long)lba, (unsigned long long)range);
1181
1182	ret = dev->transport->do_discard(dev, lba, range);
1183	if (ret < 0) {
1184		pr_debug("blkdev_issue_discard() failed for WRITE_SAME\n");
1185		return ret;
1186	}
1187
1188	task->task_scsi_status = GOOD;
1189	transport_complete_task(task, 1);
1190	return 0;
1191}
1192
1193int target_emulate_synchronize_cache(struct se_task *task)
1194{
1195	struct se_device *dev = task->task_se_cmd->se_dev;
1196
1197	if (!dev->transport->do_sync_cache) {
1198		pr_err("SYNCHRONIZE_CACHE emulation not supported"
1199			" for: %s\n", dev->transport->name);
1200		return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1201	}
1202
1203	dev->transport->do_sync_cache(task);
1204	return 0;
1205}
1206
1207int target_emulate_noop(struct se_task *task)
1208{
1209	task->task_scsi_status = GOOD;
1210	transport_complete_task(task, 1);
1211	return 0;
1212}
1213
1214/*
1215 * Write a CDB into @cdb that is based on the one the intiator sent us,
1216 * but updated to only cover the sectors that the current task handles.
1217 */
1218void target_get_task_cdb(struct se_task *task, unsigned char *cdb)
1219{
1220	struct se_cmd *cmd = task->task_se_cmd;
1221	unsigned int cdb_len = scsi_command_size(cmd->t_task_cdb);
1222
1223	memcpy(cdb, cmd->t_task_cdb, cdb_len);
1224	if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
1225		unsigned long long lba = task->task_lba;
1226		u32 sectors = task->task_sectors;
1227
1228		switch (cdb_len) {
1229		case 6:
1230			/* 21-bit LBA and 8-bit sectors */
1231			cdb[1] = (lba >> 16) & 0x1f;
1232			cdb[2] = (lba >> 8) & 0xff;
1233			cdb[3] = lba & 0xff;
1234			cdb[4] = sectors & 0xff;
1235			break;
1236		case 10:
1237			/* 32-bit LBA and 16-bit sectors */
1238			put_unaligned_be32(lba, &cdb[2]);
1239			put_unaligned_be16(sectors, &cdb[7]);
1240			break;
1241		case 12:
1242			/* 32-bit LBA and 32-bit sectors */
1243			put_unaligned_be32(lba, &cdb[2]);
1244			put_unaligned_be32(sectors, &cdb[6]);
1245			break;
1246		case 16:
1247			/* 64-bit LBA and 32-bit sectors */
1248			put_unaligned_be64(lba, &cdb[2]);
1249			put_unaligned_be32(sectors, &cdb[10]);
1250			break;
1251		case 32:
1252			/* 64-bit LBA and 32-bit sectors, extended CDB */
1253			put_unaligned_be64(lba, &cdb[12]);
1254			put_unaligned_be32(sectors, &cdb[28]);
1255			break;
1256		default:
1257			BUG();
1258		}
1259	}
1260}
1261EXPORT_SYMBOL(target_get_task_cdb);
1262