summaryrefslogtreecommitdiffstats
path: root/drivers/target/target_core_spc.c
blob: ffe02e195733487cb0f3c7a0c0b4f6350fe20be1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * SCSI Primary Commands (SPC) parsing and emulation.
 *
 * (c) Copyright 2002-2013 Datera, Inc.
 *
 * Nicholas A. Bellinger <nab@kernel.org>
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <asm/unaligned.h>

#include <scsi/scsi_proto.h>
#include <scsi/scsi_common.h>
#include <scsi/scsi_tcq.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_alua.h"
#include "target_core_pr.h"
#include "target_core_ua.h"
#include "target_core_xcopy.h"

static void spc_fill_alua_data(struct se_lun *lun, unsigned char *buf)
{
	struct t10_alua_tg_pt_gp *tg_pt_gp;

	/*
	 * Set SCCS for MAINTENANCE_IN + REPORT_TARGET_PORT_GROUPS.
	 */
	buf[5]	= 0x80;

	/*
	 * Set TPGS field for explicit and/or implicit ALUA access type
	 * and opteration.
	 *
	 * See spc4r17 section 6.4.2 Table 135
	 */
	rcu_read_lock();
	tg_pt_gp = rcu_dereference(lun->lun_tg_pt_gp);
	if (tg_pt_gp)
		buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type;
	rcu_read_unlock();
}

static u16
spc_find_scsi_transport_vd(int proto_id)
{
	switch (proto_id) {
	case SCSI_PROTOCOL_FCP:
		return SCSI_VERSION_DESCRIPTOR_FCP4;
	case SCSI_PROTOCOL_ISCSI:
		return SCSI_VERSION_DESCRIPTOR_ISCSI;
	case SCSI_PROTOCOL_SAS:
		return SCSI_VERSION_DESCRIPTOR_SAS3;
	case SCSI_PROTOCOL_SBP:
		return SCSI_VERSION_DESCRIPTOR_SBP3;
	case SCSI_PROTOCOL_SRP:
		return SCSI_VERSION_DESCRIPTOR_SRP;
	default:
		pr_warn("Cannot find VERSION DESCRIPTOR value for unknown SCSI"
			" transport PROTOCOL IDENTIFIER %#x\n", proto_id);
		return 0;
	}
}

sense_reason_t
spc_emulate_inquiry_std(struct se_cmd *cmd, unsigned char *buf)
{
	struct se_lun *lun = cmd->se_lun;
	struct se_portal_group *tpg = lun->lun_tpg;
	struct se_device *dev = cmd->se_dev;
	struct se_session *sess = cmd->se_sess;

	/* Set RMB (removable media) for tape devices */
	if (dev->transport->get_device_type(dev) == TYPE_TAPE)
		buf[1] = 0x80;

	buf[2] = 0x06; /* SPC-4 */

	/*
	 * 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
	 */
	spc_fill_alua_data(lun, buf);

	/*
	 * Set Third-Party Copy (3PC) bit to indicate support for EXTENDED_COPY
	 */
	if (dev->dev_attrib.emulate_3pc)
		buf[5] |= 0x8;
	/*
	 * Set Protection (PROTECT) bit when DIF has been enabled on the
	 * device, and the fabric supports VERIFY + PASS.  Also report
	 * PROTECT=1 if sess_prot_type has been configured to allow T10-PI
	 * to unprotected devices.
	 */
	if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
		if (dev->dev_attrib.pi_prot_type || cmd->se_sess->sess_prot_type)
			buf[5] |= 0x1;
	}

	/*
	 * Set MULTIP bit to indicate presence of multiple SCSI target ports
	 */
	if (dev->export_count > 1)
		buf[6] |= 0x10;

	buf[7] = 0x2; /* CmdQue=1 */

	/*
	 * ASCII data fields described as being left-aligned shall have any
	 * unused bytes at the end of the field (i.e., highest offset) and the
	 * unused bytes shall be filled with ASCII space characters (20h).
	 */
	memset(&buf[8], 0x20,
	       INQUIRY_VENDOR_LEN + INQUIRY_MODEL_LEN + INQUIRY_REVISION_LEN);
	memcpy(&buf[8], dev->t10_wwn.vendor,
	       strnlen(dev->t10_wwn.vendor, INQUIRY_VENDOR_LEN));
	memcpy(&buf[16], dev->t10_wwn.model,
	       strnlen(dev->t10_wwn.model, INQUIRY_MODEL_LEN));
	memcpy(&buf[32], dev->t10_wwn.revision,
	       strnlen(dev->t10_wwn.revision, INQUIRY_REVISION_LEN));

	/*
	 * Set the VERSION DESCRIPTOR fields
	 */
	put_unaligned_be16(SCSI_VERSION_DESCRIPTOR_SAM5, &buf[58]);
	put_unaligned_be16(spc_find_scsi_transport_vd(tpg->proto_id), &buf[60]);
	put_unaligned_be16(SCSI_VERSION_DESCRIPTOR_SPC4, &buf[62]);
	if (cmd->se_dev->transport->get_device_type(dev) == TYPE_DISK)
		put_unaligned_be16(SCSI_VERSION_DESCRIPTOR_SBC3, &buf[64]);

	buf[4] = 91; /* Set additional length to 91 */

	return 0;
}
EXPORT_SYMBOL(spc_emulate_inquiry_std);

/* unit serial number */
static sense_reason_t
spc_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf)
{
	struct se_device *dev = cmd->se_dev;
	u16 len;

	if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
		len = sprintf(&buf[4], "%s", dev->t10_wwn.unit_serial);
		len++; /* Extra Byte for NULL Terminator */
		buf[3] = len;
	}
	return 0;
}

/*
 * Generate NAA IEEE Registered Extended designator
 */
void spc_gen_naa_6h_vendor_specific(struct se_device *dev,
				    unsigned char *buf)
{
	unsigned char *p = &dev->t10_wwn.unit_serial[0];
	u32 company_id = dev->t10_wwn.company_id;
	int cnt, off = 0;
	bool next = true;

	/*
	 * Start NAA IEEE Registered Extended Identifier/Designator
	 */
	buf[off] = 0x6 << 4;

	/* IEEE COMPANY_ID */
	buf[off++] |= (company_id >> 20) & 0xf;
	buf[off++] = (company_id >> 12) & 0xff;
	buf[off++] = (company_id >> 4) & 0xff;
	buf[off] = (company_id & 0xf) << 4;

	/*
	 * 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 = off + 13; *p && off < cnt; p++) {
		int val = hex_to_bin(*p);

		if (val < 0)
			continue;

		if (next) {
			next = false;
			buf[off++] |= val;
		} else {
			next = true;
			buf[off] = val << 4;
		}
	}
}

/*
 * Device identification VPD, for a complete list of
 * DESIGNATOR TYPEs see spc4r17 Table 459.
 */
sense_reason_t
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_portal_group *tpg = NULL;
	struct t10_alua_lu_gp_member *lu_gp_mem;
	struct t10_alua_tg_pt_gp *tg_pt_gp;
	unsigned char *prod = &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->dev_flags & DF_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;

	/* NAA IEEE Registered Extended designator */
	spc_gen_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->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
		unit_serial_len = strlen(&dev->t10_wwn.unit_serial[0]);
		unit_serial_len++; /* For NULL Terminator */

		id_len += sprintf(&buf[off+12], "%s:%s", prod,
				&dev->t10_wwn.unit_serial[0]);
	}
	buf[off] = 0x2; /* ASCII */
	buf[off+1] = 0x1; /* T10 Vendor ID */
	buf[off+2] = 0x0;
	/* left align Vendor ID and pad with spaces */
	memset(&buf[off+4], 0x20, INQUIRY_VENDOR_LEN);
	memcpy(&buf[off+4], dev->t10_wwn.vendor,
	       strnlen(dev->t10_wwn.vendor, INQUIRY_VENDOR_LEN));
	/* 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);

	if (1) {
		struct t10_alua_lu_gp *lu_gp;
		u32 padding, scsi_name_len, scsi_target_len;
		u16 lu_gp_id = 0;
		u16 tg_pt_gp_id = 0;
		u16 tpgt;

		tpg = lun->lun_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->proto_id << 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;
		put_unaligned_be16(lun->lun_rtpi, &buf[off]);
		off += 2;
		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
		 */
		rcu_read_lock();
		tg_pt_gp = rcu_dereference(lun->lun_tg_pt_gp);
		if (!tg_pt_gp) {
			rcu_read_unlock();
			goto check_lu_gp;
		}
		tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id;
		rcu_read_unlock();

		buf[off] = tpg->proto_id << 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 */
		put_unaligned_be16(tg_pt_gp_id, &buf[off]);
		off += 2;
		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 */
		put_unaligned_be16(lu_gp_id, &buf[off]);
		off += 2;
		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:
		buf[off] = tpg->proto_id << 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.
		 */
		padding = ((-scsi_name_len) & 3);
		if (padding)
			scsi_name_len += padding;
		if (scsi_name_len > 256)
			scsi_name_len = 256;

		buf[off-1] = scsi_name_len;
		off += scsi_name_len;
		/* Header size + Designation descriptor */
		len += (scsi_name_len + 4);

		/*
		 * Target device designator
		 */
		buf[off] = tpg->proto_id << 4;
		buf[off++] |= 0x3; /* CODE SET == UTF-8 */
		buf[off] = 0x80; /* Set PIV=1 */
		/* Set ASSOCIATION == target device: 10b */
		buf[off] |= 0x20;
		/* 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>" in
		 * UTF-8 encoding.
		 */
		scsi_target_len = sprintf(&buf[off], "%s",
					  tpg->se_tpg_tfo->tpg_get_wwn(tpg));
		scsi_target_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.
		 */
		padding = ((-scsi_target_len) & 3);
		if (padding)
			scsi_target_len += padding;
		if (scsi_target_len > 256)
			scsi_target_len = 256;

		buf[off-1] = scsi_target_len;
		off += scsi_target_len;

		/* Header size + Designation descriptor */
		len += (scsi_target_len + 4);
	}
	put_unaligned_be16(len, &buf[2]); /* Page Length for VPD 0x83 */
	return 0;
}
EXPORT_SYMBOL(spc_emulate_evpd_83);

/* Extended INQUIRY Data VPD Page */
static sense_reason_t
spc_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf)
{
	struct se_device *dev = cmd->se_dev;
	struct se_session *sess = cmd->se_sess;

	buf[3] = 0x3c;
	/*
	 * Set GRD_CHK + REF_CHK for TYPE1 protection, or GRD_CHK
	 * only for TYPE3 protection.
	 */
	if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
		if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT ||
		    cmd->se_sess->sess_prot_type == TARGET_DIF_TYPE1_PROT)
			buf[4] = 0x5;
		else if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE3_PROT ||
			 cmd->se_sess->sess_prot_type == TARGET_DIF_TYPE3_PROT)
			buf[4] = 0x4;
	}

	/* logical unit supports type 1 and type 3 protection */
	if ((dev->transport->get_device_type(dev) == TYPE_DISK) &&
	    (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) &&
	    (dev->dev_attrib.pi_prot_type || cmd->se_sess->sess_prot_type)) {
		buf[4] |= (0x3 << 3);
	}

	/* Set HEADSUP, ORDSUP, SIMPSUP */
	buf[5] = 0x07;

	/* If WriteCache emulation is enabled, set V_SUP */
	if (target_check_wce(dev))
		buf[6] = 0x01;
	/* If an LBA map is present set R_SUP */
	spin_lock(&cmd->se_dev->t10_alua.lba_map_lock);
	if (!list_empty(&dev->t10_alua.lba_map_list))
		buf[8] = 0x10;
	spin_unlock(&cmd->se_dev->t10_alua.lba_map_lock);
	return 0;
}

/* Block Limits VPD page */
static sense_reason_t
spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
{
	struct se_device *dev = cmd->se_dev;
	u32 mtl = 0;
	int have_tp = 0, opt, min;

	/*
	 * 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->dev_attrib.emulate_tpu || dev->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 MAXIMUM COMPARE AND WRITE LENGTH
	 */
	if (dev->dev_attrib.emulate_caw)
		buf[5] = 0x01;

	/*
	 * Set OPTIMAL TRANSFER LENGTH GRANULARITY
	 */
	if (dev->transport->get_io_min && (min = dev->transport->get_io_min(dev)))
		put_unaligned_be16(min / dev->dev_attrib.block_size, &buf[6]);
	else
		put_unaligned_be16(1, &buf[6]);

	/*
	 * Set MAXIMUM TRANSFER LENGTH
	 *
	 * XXX: Currently assumes single PAGE_SIZE per scatterlist for fabrics
	 * enforcing maximum HW scatter-gather-list entry limit
	 */
	if (cmd->se_tfo->max_data_sg_nents) {
		mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE) /
		       dev->dev_attrib.block_size;
	}
	put_unaligned_be32(min_not_zero(mtl, dev->dev_attrib.hw_max_sectors), &buf[8]);

	/*
	 * Set OPTIMAL TRANSFER LENGTH
	 */
	if (dev->transport->get_io_opt && (opt = dev->transport->get_io_opt(dev)))
		put_unaligned_be32(opt / dev->dev_attrib.block_size, &buf[12]);
	else
		put_unaligned_be32(dev->dev_attrib.optimal_sectors, &buf[12]);

	/*
	 * Exit now if we don't support TP.
	 */
	if (!have_tp)
		goto max_write_same;

	/*
	 * Set MAXIMUM UNMAP LBA COUNT
	 */
	put_unaligned_be32(dev->dev_attrib.max_unmap_lba_count, &buf[20]);

	/*
	 * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT
	 */
	put_unaligned_be32(dev->dev_attrib.max_unmap_block_desc_count,
			   &buf[24]);

	/*
	 * Set OPTIMAL UNMAP GRANULARITY
	 */
	put_unaligned_be32(dev->dev_attrib.unmap_granularity, &buf[28]);

	/*
	 * UNMAP GRANULARITY ALIGNMENT
	 */
	put_unaligned_be32(dev->dev_attrib.unmap_granularity_alignment,
			   &buf[32]);
	if (dev->dev_attrib.unmap_granularity_alignment != 0)
		buf[32] |= 0x80; /* Set the UGAVALID bit */

	/*
	 * MAXIMUM WRITE SAME LENGTH
	 */
max_write_same:
	put_unaligned_be64(dev->dev_attrib.max_write_same_len, &buf[36]);

	return 0;
}

/* Block Device Characteristics VPD page */
static sense_reason_t
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->dev_attrib.is_nonrot ? 1 : 0;

	return 0;
}

/* Thin Provisioning VPD */
static sense_reason_t
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->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->dev_attrib.emulate_tpws != 0)
		buf[5] |= 0x40 | 0x20;

	/*
	 * The unmap_zeroes_data set means that the underlying device supports
	 * REQ_OP_DISCARD and has the discard_zeroes_data bit set. This
	 * satisfies the SBC requirements for LBPRZ, meaning that a subsequent
	 * read will return zeroes after an UNMAP or WRITE SAME (16) to an LBA
	 * See sbc4r36 6.6.4.
	 */
	if (((dev->dev_attrib.emulate_tpu != 0) ||
	     (dev->dev_attrib.emulate_tpws != 0)) &&
	     (dev->dev_attrib.unmap_zeroes_data != 0))
		buf[5] |= 0x04;

	return 0;
}

/* Referrals VPD page */
static sense_reason_t
spc_emulate_evpd_b3(struct se_cmd *cmd, unsigned char *buf)
{
	struct se_device *dev = cmd->se_dev;

	buf[0] = dev->transport->get_device_type(dev);
	buf[3] = 0x0c;
	put_unaligned_be32(dev->t10_alua.lba_map_segment_size, &buf[8]);
	put_unaligned_be32(dev->t10_alua.lba_map_segment_multiplier, &buf[12]);

	return 0;
}

static sense_reason_t
spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf);

static struct {
	uint8_t		page;
	sense_reason_t	(*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 },
	{ .page = 0xb3, .emulate = spc_emulate_evpd_b3 },
};

/* supported vital product data pages */
static sense_reason_t
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->dev_flags & DF_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 sense_reason_t
spc_emulate_inquiry(struct se_cmd *cmd)
{
	struct se_device *dev = cmd->se_dev;
	unsigned char *rbuf;
	unsigned char *cdb = cmd->t_task_cdb;
	unsigned char *buf;
	sense_reason_t ret;
	int p;
	int len = 0;

	buf = kzalloc(SE_INQUIRY_BUF, GFP_KERNEL);
	if (!buf) {
		pr_err("Unable to allocate response buffer for INQUIRY\n");
		return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
	}

	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]);
			ret = TCM_INVALID_CDB_FIELD;
			goto out;
		}

		ret = spc_emulate_inquiry_std(cmd, buf);
		len = buf[4] + 5;
		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);
			len = get_unaligned_be16(&buf[2]) + 4;
			goto out;
		}
	}

	pr_debug("Unknown VPD Code: 0x%02x\n", cdb[2]);
	ret = TCM_INVALID_CDB_FIELD;

out:
	rbuf = transport_kmap_data_sg(cmd);
	if (rbuf) {
		memcpy(rbuf, buf, min_t(u32, SE_INQUIRY_BUF, cmd->data_length));
		transport_kunmap_data_sg(cmd);
	}
	kfree(buf);

	if (!ret)
		target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, len);
	return ret;
}

static int spc_modesense_rwrecovery(struct se_cmd *cmd, u8 pc, u8 *p)
{
	p[0] = 0x01;
	p[1] = 0x0a;

	/* No changeable values for now */
	if (pc == 1)
		goto out;

out:
	return 12;
}

static int spc_modesense_control(struct se_cmd *cmd, u8 pc, u8 *p)
{
	struct se_device *dev = cmd->se_dev;
	struct se_session *sess = cmd->se_sess;

	p[0] = 0x0a;
	p[1] = 0x0a;

	/* No changeable values for now */
	if (pc == 1)
		goto out;

	/* GLTSD: No implicit save of log parameters */
	p[2] = (1 << 1);
	if (target_sense_desc_format(dev))
		/* D_SENSE: Descriptor format sense data for 64bit sectors */
		p[2] |= (1 << 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->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.
	 */
	switch (dev->dev_attrib.emulate_ua_intlck_ctrl) {
	case TARGET_UA_INTLCK_CTRL_ESTABLISH_UA:
		p[4] = 0x30;
		break;
	case TARGET_UA_INTLCK_CTRL_NO_CLEAR:
		p[4] = 0x20;
		break;
	default:	/* TARGET_UA_INTLCK_CTRL_CLEAR */
		p[4] = 0x00;
		break;
	}
	/*
	 * 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->dev_attrib.emulate_tas) ? 0x40 : 0x00;
	/*
	 * From spc4r30, section 7.5.7 Control mode page
	 *
	 * Application Tag Owner (ATO) bit set to one.
	 *
	 * If the ATO bit is set to one the device server shall not modify the
	 * LOGICAL BLOCK APPLICATION TAG field and, depending on the protection
	 * type, shall not modify the contents of the LOGICAL BLOCK REFERENCE
	 * TAG field.
	 */
	if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
		if (dev->dev_attrib.pi_prot_type || sess->sess_prot_type)
			p[5] |= 0x80;
	}

	p[8] = 0xff;
	p[9] = 0xff;
	p[11] = 30;

out:
	return 12;
}

static int spc_modesense_caching(struct se_cmd *cmd, u8 pc, u8 *p)
{
	struct se_device *dev = cmd->se_dev;

	p[0] = 0x08;
	p[1] = 0x12;

	/* No changeable values for now */
	if (pc == 1)
		goto out;

	if (target_check_wce(dev))
		p[2] = 0x04; /* Write Cache Enable */
	p[12] = 0x20; /* Disabled Read Ahead */

out:
	return 20;
}

static int spc_modesense_informational_exceptions(struct se_cmd *cmd, u8 pc, unsigned char *p)
{
	p[0] = 0x1c;
	p[1] = 0x0a;

	/* No changeable values for now */
	if (pc == 1)
		goto out;

out:
	return 12;
}

static struct {
	uint8_t		page;
	uint8_t		subpage;
	int		(*emulate)(struct se_cmd *, u8, unsigned char *);
} modesense_handlers[] = {
	{ .page = 0x01, .subpage = 0x00, .emulate = spc_modesense_rwrecovery },
	{ .page = 0x08, .subpage = 0x00, .emulate = spc_modesense_caching },
	{ .page = 0x0a, .subpage = 0x00, .emulate = spc_modesense_control },
	{ .page = 0x1c, .subpage = 0x00, .emulate = spc_modesense_informational_exceptions },
};

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_modesense_blockdesc(unsigned char *buf, u64 blocks, u32 block_size)
{
	*buf++ = 8;
	put_unaligned_be32(min(blocks, 0xffffffffull), buf);
	buf += 4;
	put_unaligned_be32(block_size, buf);
	return 9;
}

static int spc_modesense_long_blockdesc(unsigned char *buf, u64 blocks, u32 block_size)
{
	if (blocks <= 0xffffffff)
		return spc_modesense_blockdesc(buf + 3, blocks, block_size) + 3;

	*buf++ = 1;		/* LONGLBA */
	buf += 2;
	*buf++ = 16;
	put_unaligned_be64(blocks, buf);
	buf += 12;
	put_unaligned_be32(block_size, buf);

	return 17;
}

static sense_reason_t spc_emulate_modesense(struct se_cmd *cmd)
{
	struct se_device *dev = cmd->se_dev;
	char *cdb = cmd->t_task_cdb;
	unsigned char buf[SE_MODE_PAGE_BUF], *rbuf;
	int type = dev->transport->get_device_type(dev);
	int ten = (cmd->t_task_cdb[0] == MODE_SENSE_10);
	bool dbd = !!(cdb[1] & 0x08);
	bool llba = ten ? !!(cdb[1] & 0x10) : false;
	u8 pc = cdb[2] >> 6;
	u8 page = cdb[2] & 0x3f;
	u8 subpage = cdb[3];
	int length = 0;
	int ret;
	int i;

	memset(buf, 0, SE_MODE_PAGE_BUF);

	/*
	 * Skip over MODE DATA LENGTH + MEDIUM TYPE fields to byte 3 for
	 * MODE_SENSE_10 and byte 2 for MODE_SENSE (6).
	 */
	length = ten ? 3 : 2;

	/* DEVICE-SPECIFIC PARAMETER */
	if (cmd->se_lun->lun_access_ro || target_lun_is_rdonly(cmd))
		spc_modesense_write_protect(&buf[length], type);

	/*
	 * SBC only allows us to enable FUA and DPO together.  Fortunately
	 * DPO is explicitly specified as a hint, so a noop is a perfectly
	 * valid implementation.
	 */
	if (target_check_fua(dev))
		spc_modesense_dpofua(&buf[length], type);

	++length;

	/* BLOCK DESCRIPTOR */

	/*
	 * For now we only include a block descriptor for disk (SBC)
	 * devices; other command sets use a slightly different format.
	 */
	if (!dbd && type == TYPE_DISK) {
		u64 blocks = dev->transport->get_blocks(dev);
		u32 block_size = dev->dev_attrib.block_size;

		if (ten) {
			if (llba) {
				length += spc_modesense_long_blockdesc(&buf[length],
								       blocks, block_size);
			} else {
				length += 3;
				length += spc_modesense_blockdesc(&buf[length],
								  blocks, block_size);
			}
		} else {
			length += spc_modesense_blockdesc(&buf[length], blocks,
							  block_size);
		}
	} else {
		if (ten)
			length += 4;
		else
			length += 1;
	}

	if (page == 0x3f) {
		if (subpage != 0x00 && subpage != 0xff) {
			pr_warn("MODE_SENSE: Invalid subpage code: 0x%02x\n", subpage);
			return TCM_INVALID_CDB_FIELD;
		}

		for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) {
			/*
			 * Tricky way to say all subpage 00h for
			 * subpage==0, all subpages for subpage==0xff
			 * (and we just checked above that those are
			 * the only two possibilities).
			 */
			if ((modesense_handlers[i].subpage & ~subpage) == 0) {
				ret = modesense_handlers[i].emulate(cmd, pc, &buf[length]);
				if (!ten && length + ret >= 255)
					break;
				length += ret;
			}
		}

		goto set_length;
	}

	for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i)
		if (modesense_handlers[i].page == page &&
		    modesense_handlers[i].subpage == subpage) {
			length += modesense_handlers[i].emulate(cmd, pc, &buf[length]);
			goto set_length;
		}

	/*
	 * We don't intend to implement:
	 *  - obsolete page 03h "format parameters" (checked by Solaris)
	 */
	if (page != 0x03)
		pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n",
		       page, subpage);

	return TCM_UNKNOWN_MODE_PAGE;

set_length:
	if (ten)
		put_unaligned_be16(length - 2, buf);
	else
		buf[0] = length - 1;

	rbuf = transport_kmap_data_sg(cmd);
	if (rbuf) {
		memcpy(rbuf, buf, min_t(u32, SE_MODE_PAGE_BUF, cmd->data_length));
		transport_kunmap_data_sg(cmd);
	}

	target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, length);
	return 0;
}

static sense_reason_t spc_emulate_modeselect(struct se_cmd *cmd)
{
	char *cdb = cmd->t_task_cdb;
	bool ten = cdb[0] == MODE_SELECT_10;
	int off = ten ? 8 : 4;
	bool pf = !!(cdb[1] & 0x10);
	u8 page, subpage;
	unsigned char *buf;
	unsigned char tbuf[SE_MODE_PAGE_BUF];
	int length;
	sense_reason_t ret = 0;
	int i;

	if (!cmd->data_length) {
		target_complete_cmd(cmd, SAM_STAT_GOOD);
		return 0;
	}

	if (cmd->data_length < off + 2)
		return TCM_PARAMETER_LIST_LENGTH_ERROR;

	buf = transport_kmap_data_sg(cmd);
	if (!buf)
		return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;

	if (!pf) {
		ret = TCM_INVALID_CDB_FIELD;
		goto out;
	}

	page = buf[off] & 0x3f;
	subpage = buf[off] & 0x40 ? buf[off + 1] : 0;

	for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i)
		if (modesense_handlers[i].page == page &&
		    modesense_handlers[i].subpage == subpage) {
			memset(tbuf, 0, SE_MODE_PAGE_BUF);
			length = modesense_handlers[i].emulate(cmd, 0, tbuf);
			goto check_contents;
		}

	ret = TCM_UNKNOWN_MODE_PAGE;
	goto out;

check_contents:
	if (cmd->data_length < off + length) {
		ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
		goto out;
	}

	if (memcmp(buf + off, tbuf, length))
		ret = TCM_INVALID_PARAMETER_LIST;

out:
	transport_kunmap_data_sg(cmd);

	if (!ret)
		target_complete_cmd(cmd, SAM_STAT_GOOD);
	return ret;
}

static sense_reason_t spc_emulate_request_sense(struct se_cmd *cmd)
{
	unsigned char *cdb = cmd->t_task_cdb;
	unsigned char *rbuf;
	u8 ua_asc = 0, ua_ascq = 0;
	unsigned char buf[SE_SENSE_BUF];
	bool desc_format = target_sense_desc_format(cmd->se_dev);

	memset(buf, 0, SE_SENSE_BUF);

	if (cdb[1] & 0x01) {
		pr_err("REQUEST_SENSE description emulation not"
			" supported\n");
		return TCM_INVALID_CDB_FIELD;
	}

	rbuf = transport_kmap_data_sg(cmd);
	if (!rbuf)
		return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;

	if (!core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq))
		scsi_build_sense_buffer(desc_format, buf, UNIT_ATTENTION,
					ua_asc, ua_ascq);
	else
		scsi_build_sense_buffer(desc_format, buf, NO_SENSE, 0x0, 0x0);

	memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
	transport_kunmap_data_sg(cmd);

	target_complete_cmd(cmd, SAM_STAT_GOOD);
	return 0;
}

sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd)
{
	struct se_dev_entry *deve;
	struct se_session *sess = cmd->se_sess;
	struct se_node_acl *nacl;
	struct scsi_lun slun;
	unsigned char *buf;
	u32 lun_count = 0, offset = 8;
	__be32 len;

	buf = transport_kmap_data_sg(cmd);
	if (cmd->data_length && !buf)
		return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;

	/*
	 * If no struct se_session pointer is present, this struct se_cmd is
	 * coming via a target_core_mod PASSTHROUGH op, and not through
	 * a $FABRIC_MOD.  In that case, report LUN=0 only.
	 */
	if (!sess)
		goto done;

	nacl = sess->se_node_acl;

	rcu_read_lock();
	hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
		/*
		 * We determine the correct LUN LIST LENGTH even once we
		 * have reached the initial allocation length.
		 * See SPC2-R20 7.19.
		 */
		lun_count++;
		if (offset >= cmd->data_length)
			continue;

		int_to_scsilun(deve->mapped_lun, &slun);
		memcpy(buf + offset, &slun,
		       min(8u, cmd->data_length - offset));
		offset += 8;
	}
	rcu_read_unlock();

	/*
	 * See SPC3 r07, page 159.
	 */
done:
	/*
	 * If no LUNs are accessible, report virtual LUN 0.
	 */
	if (lun_count == 0) {
		int_to_scsilun(0, &slun);
		if (cmd->data_length > 8)
			memcpy(buf + offset, &slun,
			       min(8u, cmd->data_length - offset));
		lun_count = 1;
	}

	if (buf) {
		len = cpu_to_be32(lun_count * 8);
		memcpy(buf, &len, min_t(int, sizeof len, cmd->data_length));
		transport_kunmap_data_sg(cmd);
	}

	target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, 8 + lun_count * 8);
	return 0;
}
EXPORT_SYMBOL(spc_emulate_report_luns);

static sense_reason_t
spc_emulate_testunitready(struct se_cmd *cmd)
{
	target_complete_cmd(cmd, SAM_STAT_GOOD);
	return 0;
}

static void set_dpofua_usage_bits(u8 *usage_bits, struct se_device *dev)
{
	if (!target_check_fua(dev))
		usage_bits[1] &= ~0x18;
	else
		usage_bits[1] |= 0x18;
}

static void set_dpofua_usage_bits32(u8 *usage_bits, struct se_device *dev)
{
	if (!target_check_fua(dev))
		usage_bits[10] &= ~0x18;
	else
		usage_bits[10] |= 0x18;
}

static struct target_opcode_descriptor tcm_opcode_read6 = {
	.support = SCSI_SUPPORT_FULL,
	.opcode = READ_6,
	.cdb_size = 6,
	.usage_bits = {READ_6, 0x1f, 0xff, 0xff,
		       0xff, SCSI_CONTROL_MASK},
};

static struct target_opcode_descriptor tcm_opcode_read10 = {
	.support = SCSI_SUPPORT_FULL,
	.opcode = READ_10,
	.cdb_size = 10,
	.usage_bits = {READ_10, 0xf8, 0xff, 0xff,
		       0xff, 0xff, SCSI_GROUP_NUMBER_MASK, 0xff,
		       0xff, SCSI_CONTROL_MASK},
	.update_usage_bits = set_dpofua_usage_bits,
};

static struct target_opcode_descriptor tcm_opcode_read12 = {
	.support = SCSI_SUPPORT_FULL,
	.opcode = READ_12,
	.cdb_size = 12,
	.usage_bits = {READ_12, 0xf8, 0xff, 0xff,
		       0xff, 0xff, 0xff, 0xff,
		       0xff, 0xff, SCSI_GROUP_NUMBER_MASK, SCSI_CONTROL_MASK},
	.update_usage_bits = set_dpofua_usage_bits,
};

static struct target_opcode_descriptor tcm_opcode_read16 = {
	.support = SCSI_SUPPORT_FULL,
	.opcode = READ_16,
	.cdb_size = 16,
	.usage_bits = {READ_16, 0xf8, 0xff, 0xff,
		       0xff, 0xff, 0xff, 0xff,
		       0xff, 0xff, 0xff, 0xff,
		       0xff, 0xff, SCSI_GROUP_NUMBER_MASK, SCSI_CONTROL_MASK},
	.update_usage_bits = set_dpofua_usage_bits,
};

static struct target_opcode_descriptor tcm_opcode_write6 = {
	.support = SCSI_SUPPORT_FULL,
	.opcode = WRITE_6,
	.cdb_size = 6,
	.usage_bits = {WRITE_6, 0x1f, 0xff, 0xff,
		       0xff, SCSI_CONTROL_MASK},
};

static struct target_opcode_descriptor tcm_opcode_write10 = {
	.support = SCSI_SUPPORT_FULL,
	.opcode = WRITE_10,
	.cdb_size = 10,
	.usage_bits = {WRITE_10, 0xf8, 0xff, 0xff,
		       0xff, 0xff, SCSI_GROUP_NUMBER_MASK, 0xff,
		       0xff, SCSI_CONTROL_MASK},
	.update_usage_bits = set_dpofua_usage_bits,
};

static struct target_opcode_descriptor tcm_opcode_write_verify10 = {
	.support = SCSI_SUPPORT_FULL,
	.opcode = WRITE_VERIFY,
	.cdb_size = 10,
	.usage_bits = {WRITE_VERIFY, 0xf0, 0xff, 0xff,
		       0xff, 0xff, SCSI_GROUP_NUMBER_MASK, 0xff,
		       0xff, SCSI_CONTROL_MASK},
	.update_usage_bits = set_dpofua_usage_bits,
};

static struct target_opcode_descriptor tcm_opcode_write12 = {
	.support = SCSI_SUPPORT_FULL,
	.opcode = WRITE_12,
	.cdb_size = 12,
	.usage_bits = {WRITE_12, 0xf8, 0xff, 0xff,
		       0xff, 0xff, 0xff, 0xff,
		       0xff, 0xff, SCSI_GROUP_NUMBER_MASK, SCSI_CONTROL_MASK},
	.update_usage_bits = set_dpofua_usage_bits,
};

static struct target_opcode_descriptor tcm_opcode_write16 = {
	.support = SCSI_SUPPORT_FULL,
	.opcode = WRITE_16,
	.cdb_size = 16,
	.usage_bits = {WRITE_16, 0xf8, 0xff, 0xff,
		       0xff, 0xff, 0xff, 0xff,
		       0xff, 0xff, 0xff, 0xff,
		       0xff, 0xff, SCSI_GROUP_NUMBER_MASK, SCSI_CONTROL_MASK},
	.update_usage_bits = set_dpofua_usage_bits,
};

static struct target_opcode_descriptor tcm_opcode_write_verify16 = {
	.support = SCSI_SUPPORT_FULL,
	.opcode = WRITE_VERIFY_16,
	.cdb_size = 16,
	.usage_bits = {WRITE_VERIFY_16, 0xf0, 0xff, 0xff,
		       0xff, 0xff, 0xff, 0xff,
		       0xff, 0xff, 0xff, 0xff,
		       0xff, 0xff, SCSI_GROUP_NUMBER_MASK, SCSI_CONTROL_MASK},
	.update_usage_bits = set_dpofua_usage_bits,
};

static bool tcm_is_ws_enabled(struct se_cmd *cmd)
{
	struct sbc_ops *ops = cmd->protocol_data;
	struct se_device *dev = cmd->se_dev;

	return (dev->dev_attrib.emulate_tpws && !!ops->execute_unmap) ||
	       !!ops->execute_write_same;
}

static struct target_opcode_descriptor tcm_opcode_write_same32 = {
	.support = SCSI_SUPPORT_FULL,
	.serv_action_valid = 1,
	.opcode = VARIABLE_LENGTH_CMD,
	.service_action = WRITE_SAME_32,
	.cdb_size = 32,
	.usage_bits = {VARIABLE_LENGTH_CMD, SCSI_CONTROL_MASK, 0x00, 0x00,
		       0x00, 0x00, SCSI_GROUP_NUMBER_MASK, 0x18,
		       0x00, WRITE_SAME_32, 0xe8, 0x00,
		       0xff, 0xff, 0xff, 0xff,
		       0xff, 0xff, 0xff, 0xff,
		       0x00, 0x00, 0x00, 0x00,
		       0x00, 0x00, 0x00, 0x00,
		       0xff, 0xff, 0xff, 0xff},
	.enabled = tcm_is_ws_enabled,
	.update_usage_bits = set_dpofua_usage_bits32,
};

static bool tcm_is_caw_enabled(struct se_cmd *cmd)
{
	struct se_device *dev = cmd->se_dev;

	return dev->dev_attrib.emulate_caw;
}

static struct target_opcode_descriptor tcm_opcode_compare_write = {
	.support = SCSI_SUPPORT_FULL,
	.opcode = COMPARE_AND_WRITE,
	.cdb_size = 16,
	.usage_bits = {COMPARE_AND_WRITE, 0x18, 0xff, 0xff,
		       0xff, 0xff, 0xff, 0xff,
		       0xff, 0xff, 0x00, 0x00,
		       0x00, 0xff, SCSI_GROUP_NUMBER_MASK, SCSI_CONTROL_MASK},
	.enabled = tcm_is_caw_enabled,
	.update_usage_bits = set_dpofua_usage_bits,
};

static struct target_opcode_descriptor tcm_opcode_read_capacity = {
	.support = SCSI_SUPPORT_FULL,
	.opcode = READ_CAPACITY,
	.cdb_size = 10,
	.usage_bits = {READ_CAPACITY, 0x00, 0xff, 0xff,
		       0xff, 0xff, 0x00, 0x00,
		       0x01, SCSI_CONTROL_MASK},
};

static struct target_opcode_descriptor tcm_opcode_read_capacity16 = {
	.support = SCSI_SUPPORT_FULL,
	.serv_action_valid = 1,
	.opcode = SERVICE_ACTION_IN_16,
	.service_action = SAI_READ_CAPACITY_16,
	.cdb_size = 16,
	.usage_bits = {SERVICE_ACTION_IN_16, SAI_READ_CAPACITY_16, 0x00, 0x00,
		       0x00, 0x00, 0x00, 0x00,
		       0x00, 0x00, 0xff, 0xff,
		       0xff, 0xff, 0x00, SCSI_CONTROL_MASK},
};

static bool tcm_is_rep_ref_enabled(struct se_cmd *cmd)
{
	struct se_device *dev = cmd->se_dev;

	spin_lock(&dev->t10_alua.lba_map_lock);
	if (list_empty(&dev->t10_alua.lba_map_list)) {
		spin_unlock(&dev->t10_alua.lba_map_lock);
		return false;
	}
	spin_unlock(&dev->t10_alua.lba_map_lock);
	return true;

}

static struct target_opcode_descriptor tcm_opcode_read_report_refferals = {
	.support = SCSI_SUPPORT_FULL,
	.serv_action_valid = 1,
	.opcode = SERVICE_ACTION_IN_16,
	.service_action = SAI_REPORT_REFERRALS,
	.cdb_size = 16,
	.usage_bits = {SERVICE_ACTION_IN_16, SAI_REPORT_REFERRALS, 0x00, 0x00,
		       0x00, 0x00, 0x00, 0x00,
		       0x00, 0x00, 0xff, 0xff,
		       0xff, 0xff, 0x00, SCSI_CONTROL_MASK},
	.enabled = tcm_is_rep_ref_enabled,
};

static struct target_opcode_descriptor tcm_opcode_sync_cache = {
	.support = SCSI_SUPPORT_FULL,
	.opcode = SYNCHRONIZE_CACHE,
	.cdb_size = 10,
	.usage_bits = {SYNCHRONIZE_CACHE, 0x02, 0xff, 0xff,
		       0xff, 0xff, SCSI_GROUP_NUMBER_MASK, 0xff,
		       0xff, SCSI_CONTROL_MASK},
};

static struct target_opcode_descriptor tcm_opcode_sync_cache16 = {
	.support = SCSI_SUPPORT_FULL,
	.opcode = SYNCHRONIZE_CACHE_16,
	.cdb_size = 16,
	.usage_bits = {SYNCHRONIZE_CACHE_16, 0x02, 0xff, 0xff,
		       0xff, 0xff, 0xff, 0xff,
		       0xff, 0xff, 0xff, 0xff,
		       0xff, 0xff, SCSI_GROUP_NUMBER_MASK, SCSI_CONTROL_MASK},
};

static bool tcm_is_unmap_enabled(struct se_cmd *cmd)
{
	struct sbc_ops *ops = cmd->protocol_data;
	struct se_device *dev = cmd->se_dev;

	return ops->execute_unmap && dev->dev_attrib.emulate_tpu;
}

static struct target_opcode_descriptor tcm_opcode_unmap = {
	.support = SCSI_SUPPORT_FULL,
	.opcode = UNMAP,
	.cdb_size = 10,
	.usage_bits = {UNMAP, 0x00, 0x00, 0x00,
		       0x00, 0x00, SCSI_GROUP_NUMBER_MASK, 0xff,
		       0xff, SCSI_CONTROL_MASK},
	.enabled = tcm_is_unmap_enabled,
};

static struct target_opcode_descriptor tcm_opcode_write_same = {
	.support = SCSI_SUPPORT_FULL,
	.opcode = WRITE_SAME,
	.cdb_size = 10,
	.usage_bits = {WRITE_SAME, 0xe8, 0xff, 0xff,
		       0xff, 0xff, SCSI_GROUP_NUMBER_MASK, 0xff,
		       0xff, SCSI_CONTROL_MASK},
	.enabled = tcm_is_ws_enabled,
};

static struct target_opcode_descriptor tcm_opcode_write_same16 = {
	.support = SCSI_SUPPORT_FULL,
	.opcode = WRITE_SAME_16,
	.cdb_size = 16,
	.usage_bits = {WRITE_SAME_16, 0xe8, 0xff, 0xff,
		       0xff, 0xff, 0xff, 0xff,
		       0xff, 0xff, 0xff, 0xff,
		       0xff, 0xff, SCSI_GROUP_NUMBER_MASK, SCSI_CONTROL_MASK},
	.enabled = tcm_is_ws_enabled,
};

static struct target_opcode_descriptor tcm_opcode_verify = {
	.support = SCSI_SUPPORT_FULL,
	.opcode = VERIFY,
	.cdb_size = 10,
	.usage_bits = {VERIFY, 0x00, 0xff, 0xff,
		       0xff, 0xff, SCSI_GROUP_NUMBER_MASK, 0xff,
		       0xff, SCSI_CONTROL_MASK},
};

static struct target_opcode_descriptor tcm_opcode_verify16 = {
	.support = SCSI_SUPPORT_FULL,
	.opcode = VERIFY_16,
	.cdb_size = 16,
	.usage_bits = {VERIFY_16, 0x00, 0xff, 0xff,
		       0xff, 0xff, 0xff, 0xff,
		       0xff, 0xff, 0xff, 0xff,
		       0xff, 0xff, SCSI_GROUP_NUMBER_MASK, SCSI_CONTROL_MASK},
};

static struct target_opcode_descriptor tcm_opcode_start_stop = {
	.support = SCSI_SUPPORT_FULL,
	.opcode = START_STOP,
	.cdb_size = 6,
	.usage_bits = {START_STOP, 0x01, 0x00, 0x00,
		       0x01, SCSI_CONTROL_MASK},
};

static struct target_opcode_descriptor tcm_opcode_mode_select = {
	.support = SCSI_SUPPORT_FULL,
	.opcode = MODE_SELECT,
	.cdb_size = 6,
	.usage_bits = {MODE_SELECT, 0x10, 0x00, 0x00,
		       0xff, SCSI_CONTROL_MASK},
};

static struct target_opcode_descriptor tcm_opcode_mode_select10 = {
	.support = SCSI_SUPPORT_FULL,
	.opcode = MODE_SELECT_10,
	.cdb_size = 10,
	.usage_bits = {MODE_SELECT_10, 0x10, 0x00, 0x00,
		       0x00, 0x00, 0x00, 0xff,
		       0xff, SCSI_CONTROL_MASK},
};

static struct target_opcode_descriptor tcm_opcode_mode_sense = {
	.support = SCSI_SUPPORT_FULL,
	.opcode = MODE_SENSE,
	.cdb_size = 6,
	.usage_bits = {MODE_SENSE, 0x08, 0xff, 0xff,
		       0xff, SCSI_CONTROL_MASK},
};

static struct target_opcode_descriptor tcm_opcode_mode_sense10 = {
	.support = SCSI_SUPPORT_FULL,
	.opcode = MODE_SENSE_10,
	.cdb_size = 10,
	.usage_bits = {MODE_SENSE_10, 0x18, 0xff, 0xff,
		       0x00, 0x00, 0x00, 0xff,
		       0xff, SCSI_CONTROL_MASK},
};

static struct target_opcode_descriptor tcm_opcode_pri_read_keys = {
	.support = SCSI_SUPPORT_FULL,
	.serv_action_valid = 1,
	.opcode = PERSISTENT_RESERVE_IN,
	.service_action = PRI_READ_KEYS,
	.cdb_size = 10,
	.usage_bits = {PERSISTENT_RESERVE_IN, PRI_READ_KEYS, 0x00, 0x00,
		       0x00, 0x00, 0x00, 0xff,
		       0xff, SCSI_CONTROL_MASK},
};

static struct target_opcode_descriptor tcm_opcode_pri_read_resrv = {
	.support = SCSI_SUPPORT_FULL,
	.serv_action_valid = 1,
	.opcode = PERSISTENT_RESERVE_IN,
	.service_action = PRI_READ_RESERVATION,
	.cdb_size = 10,
	.usage_bits = {PERSISTENT_RESERVE_IN, PRI_READ_RESERVATION, 0x00, 0x00,
		       0x00, 0x00, 0x00, 0xff,
		       0xff, SCSI_CONTROL_MASK},
};

static bool tcm_is_pr_enabled(struct se_cmd *cmd)
{
	struct se_device *dev = cmd->se_dev;

	return dev->dev_attrib.emulate_pr;
}

static struct target_opcode_descriptor tcm_opcode_pri_read_caps = {
	.support = SCSI_SUPPORT_FULL,
	.serv_action_valid = 1,
	.opcode = PERSISTENT_RESERVE_IN,
	.service_action = PRI_REPORT_CAPABILITIES,
	.cdb_size = 10,
	.usage_bits = {PERSISTENT_RESERVE_IN, PRI_REPORT_CAPABILITIES, 0x00, 0x00,
		       0x00, 0x00, 0x00, 0xff,
		       0xff, SCSI_CONTROL_MASK},
	.enabled = tcm_is_pr_enabled,
};

static struct target_opcode_descriptor tcm_opcode_pri_read_full_status = {
	.support = SCSI_SUPPORT_FULL,
	.serv_action_valid = 1,
	.opcode = PERSISTENT_RESERVE_IN,
	.service_action = PRI_READ_FULL_STATUS,
	.cdb_size = 10,
	.usage_bits = {PERSISTENT_RESERVE_IN, PRI_READ_FULL_STATUS, 0x00, 0x00,
		       0x00, 0x00, 0x00, 0xff,
		       0xff, SCSI_CONTROL_MASK},
	.enabled = tcm_is_pr_enabled,
};

static struct target_opcode_descriptor tcm_opcode_pro_register = {
	.support = SCSI_SUPPORT_FULL,
	.serv_action_valid = 1,
	.opcode = PERSISTENT_RESERVE_OUT,
	.service_action = PRO_REGISTER,
	.cdb_size = 10,
	.usage_bits = {PERSISTENT_RESERVE_OUT, PRO_REGISTER, 0xff, 0x00,
		       0x00, 0xff, 0xff, 0xff,
		       0xff, SCSI_CONTROL_MASK},
	.enabled = tcm_is_pr_enabled,
};

static struct target_opcode_descriptor tcm_opcode_pro_reserve = {
	.support = SCSI_SUPPORT_FULL,
	.serv_action_valid = 1,
	.opcode = PERSISTENT_RESERVE_OUT,
	.service_action = PRO_RESERVE,
	.cdb_size = 10,
	.usage_bits = {PERSISTENT_RESERVE_OUT, PRO_RESERVE, 0xff, 0x00,
		       0x00, 0xff, 0xff, 0xff,
		       0xff, SCSI_CONTROL_MASK},
	.enabled = tcm_is_pr_enabled,
};

static struct target_opcode_descriptor tcm_opcode_pro_release = {
	.support = SCSI_SUPPORT_FULL,
	.serv_action_valid = 1,
	.opcode = PERSISTENT_RESERVE_OUT,
	.service_action = PRO_RELEASE,
	.cdb_size = 10,
	.usage_bits = {PERSISTENT_RESERVE_OUT, PRO_RELEASE, 0xff, 0x00,
		       0x00, 0xff, 0xff, 0xff,
		       0xff, SCSI_CONTROL_MASK},
	.enabled = tcm_is_pr_enabled,
};

static struct target_opcode_descriptor tcm_opcode_pro_clear = {
	.support = SCSI_SUPPORT_FULL,
	.serv_action_valid = 1,
	.opcode = PERSISTENT_RESERVE_OUT,
	.service_action = PRO_CLEAR,
	.cdb_size = 10,
	.usage_bits = {PERSISTENT_RESERVE_OUT, PRO_CLEAR, 0xff, 0x00,
		       0x00, 0xff, 0xff, 0xff,
		       0xff, SCSI_CONTROL_MASK},
	.enabled = tcm_is_pr_enabled,
};

static struct target_opcode_descriptor tcm_opcode_pro_preempt = {
	.support = SCSI_SUPPORT_FULL,
	.serv_action_valid = 1,
	.opcode = PERSISTENT_RESERVE_OUT,
	.service_action = PRO_PREEMPT,
	.cdb_size = 10,
	.usage_bits = {PERSISTENT_RESERVE_OUT, PRO_PREEMPT, 0xff, 0x00,
		       0x00, 0xff, 0xff, 0xff,
		       0xff, SCSI_CONTROL_MASK},
	.enabled = tcm_is_pr_enabled,
};

static struct target_opcode_descriptor tcm_opcode_pro_preempt_abort = {
	.support = SCSI_SUPPORT_FULL,
	.serv_action_valid = 1,
	.opcode = PERSISTENT_RESERVE_OUT,
	.service_action = PRO_PREEMPT_AND_ABORT,
	.cdb_size = 10,
	.usage_bits = {PERSISTENT_RESERVE_OUT, PRO_PREEMPT_AND_ABORT, 0xff, 0x00,
		       0x00, 0xff, 0xff, 0xff,
		       0xff, SCSI_CONTROL_MASK},
	.enabled = tcm_is_pr_enabled,
};

static struct target_opcode_descriptor tcm_opcode_pro_reg_ign_exist = {
	.support = SCSI_SUPPORT_FULL,
	.serv_action_valid = 1,
	.opcode = PERSISTENT_RESERVE_OUT,
	.service_action = PRO_REGISTER_AND_IGNORE_EXISTING_KEY,
	.cdb_size = 10,
	.usage_bits = {
		PERSISTENT_RESERVE_OUT, PRO_REGISTER_AND_IGNORE_EXISTING_KEY,
		0xff, 0x00,
		0x00, 0xff, 0xff, 0xff,
		0xff, SCSI_CONTROL_MASK},
	.enabled = tcm_is_pr_enabled,
};

static struct target_opcode_descriptor tcm_opcode_pro_register_move = {
	.support = SCSI_SUPPORT_FULL,
	.serv_action_valid = 1,
	.opcode = PERSISTENT_RESERVE_OUT,
	.service_action = PRO_REGISTER_AND_MOVE,
	.cdb_size = 10,
	.usage_bits = {PERSISTENT_RESERVE_OUT, PRO_REGISTER_AND_MOVE, 0xff, 0x00,
		       0x00, 0xff, 0xff, 0xff,
		       0xff, SCSI_CONTROL_MASK},
	.enabled = tcm_is_pr_enabled,
};

static bool tcm_is_scsi2_reservations_enabled(struct se_cmd *cmd)
{
	struct se_device *dev = cmd->se_dev;

	return dev->dev_attrib.emulate_pr;
}

static struct target_opcode_descriptor tcm_opcode_release = {
	.support = SCSI_SUPPORT_FULL,
	.opcode = RELEASE,
	.cdb_size = 6,
	.usage_bits = {RELEASE, 0x00, 0x00, 0x00,
		       0x00, SCSI_CONTROL_MASK},
	.enabled = tcm_is_scsi2_reservations_enabled,
};

static struct target_opcode_descriptor tcm_opcode_release10 = {
	.support = SCSI_SUPPORT_FULL,
	.opcode = RELEASE_10,
	.cdb_size = 10,
	.usage_bits = {RELEASE_10, 0x00, 0x00, 0x00,
		       0x00, 0x00, 0x00, 0xff,
		       0xff, SCSI_CONTROL_MASK},
	.enabled = tcm_is_scsi2_reservations_enabled,
};

static struct target_opcode_descriptor tcm_opcode_reserve = {
	.support = SCSI_SUPPORT_FULL,
	.opcode = RESERVE,
	.cdb_size = 6,
	.usage_bits = {RESERVE, 0x00, 0x00, 0x00,
		       0x00, SCSI_CONTROL_MASK},
	.enabled = tcm_is_scsi2_reservations_enabled,
};

static struct target_opcode_descriptor tcm_opcode_reserve10 = {
	.support = SCSI_SUPPORT_FULL,
	.opcode = RESERVE_10,
	.cdb_size = 10,
	.usage_bits = {RESERVE_10, 0x00, 0x00, 0x00,
		       0x00, 0x00, 0x00, 0xff,
		       0xff, SCSI_CONTROL_MASK},
	.enabled = tcm_is_scsi2_reservations_enabled,
};

static struct target_opcode_descriptor tcm_opcode_request_sense = {
	.support = SCSI_SUPPORT_FULL,
	.opcode = REQUEST_SENSE,
	.cdb_size = 6,
	.usage_bits = {REQUEST_SENSE, 0x00, 0x00, 0x00,
		       0xff, SCSI_CONTROL_MASK},
};

static struct target_opcode_descriptor tcm_opcode_inquiry = {
	.support = SCSI_SUPPORT_FULL,
	.opcode = INQUIRY,
	.cdb_size = 6,
	.usage_bits = {INQUIRY, 0x01, 0xff, 0xff,
		       0xff, SCSI_CONTROL_MASK},
};

static bool tcm_is_3pc_enabled(struct se_cmd *cmd)
{
	struct se_device *dev = cmd->se_dev;

	return dev->dev_attrib.emulate_3pc;
}

static struct target_opcode_descriptor tcm_opcode_extended_copy_lid1 = {
	.support = SCSI_SUPPORT_FULL,
	.serv_action_valid = 1,
	.opcode = EXTENDED_COPY,
	.cdb_size = 16,
	.usage_bits = {EXTENDED_COPY, 0x00, 0x00, 0x00,
		       0x00, 0x00, 0x00, 0x00,
		       0x00, 0x00, 0xff, 0xff,
		       0xff, 0xff, 0x00, SCSI_CONTROL_MASK},
	.enabled = tcm_is_3pc_enabled,
};

static struct target_opcode_descriptor tcm_opcode_rcv_copy_res_op_params = {
	.support = SCSI_SUPPORT_FULL,
	.serv_action_valid = 1,
	.opcode = RECEIVE_COPY_RESULTS,
	.service_action = RCR_SA_OPERATING_PARAMETERS,
	.cdb_size = 16,
	.usage_bits = {RECEIVE_COPY_RESULTS, RCR_SA_OPERATING_PARAMETERS,
		       0x00, 0x00,
		       0x00, 0x00, 0x00, 0x00,
		       0x00, 0x00, 0xff, 0xff,
		       0xff, 0xff, 0x00, SCSI_CONTROL_MASK},
	.enabled = tcm_is_3pc_enabled,
};

static struct target_opcode_descriptor tcm_opcode_report_luns = {
	.support = SCSI_SUPPORT_FULL,
	.opcode = REPORT_LUNS,
	.cdb_size = 12,
	.usage_bits = {REPORT_LUNS, 0x00, 0xff, 0x00,
		       0x00, 0x00, 0xff, 0xff,
		       0xff, 0xff, 0x00, SCSI_CONTROL_MASK},
};

static struct target_opcode_descriptor tcm_opcode_test_unit_ready = {
	.support = SCSI_SUPPORT_FULL,
	.opcode = TEST_UNIT_READY,
	.cdb_size = 6,
	.usage_bits = {TEST_UNIT_READY, 0x00, 0x00, 0x00,
		       0x00, SCSI_CONTROL_MASK},
};

static struct target_opcode_descriptor tcm_opcode_report_target_pgs = {
	.support = SCSI_SUPPORT_FULL,
	.serv_action_valid = 1,
	.opcode = MAINTENANCE_IN,
	.service_action = MI_REPORT_TARGET_PGS,
	.cdb_size = 12,
	.usage_bits = {MAINTENANCE_IN, 0xE0 | MI_REPORT_TARGET_PGS, 0x00, 0x00,
		       0x00, 0x00, 0xff, 0xff,
		       0xff, 0xff, 0x00, SCSI_CONTROL_MASK},
};


static bool spc_rsoc_enabled(struct se_cmd *cmd)
{
	struct se_device *dev = cmd->se_dev;

	return dev->dev_attrib.emulate_rsoc;
}

static struct target_opcode_descriptor tcm_opcode_report_supp_opcodes = {
	.support = SCSI_SUPPORT_FULL,
	.serv_action_valid = 1,
	.opcode = MAINTENANCE_IN,
	.service_action = MI_REPORT_SUPPORTED_OPERATION_CODES,
	.cdb_size = 12,
	.usage_bits = {MAINTENANCE_IN, MI_REPORT_SUPPORTED_OPERATION_CODES,
		       0x87, 0xff,
		       0xff, 0xff, 0xff, 0xff,
		       0xff, 0xff, 0x00, SCSI_CONTROL_MASK},
	.enabled = spc_rsoc_enabled,
};

static bool tcm_is_set_tpg_enabled(struct se_cmd *cmd)
{
	struct t10_alua_tg_pt_gp *l_tg_pt_gp;
	struct se_lun *l_lun = cmd->se_lun;

	rcu_read_lock();
	l_tg_pt_gp = rcu_dereference(l_lun->lun_tg_pt_gp);
	if (!l_tg_pt_gp) {
		rcu_read_unlock();
		return false;
	}
	if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)) {
		rcu_read_unlock();
		return false;
	}
	rcu_read_unlock();

	return true;
}

static struct target_opcode_descriptor tcm_opcode_set_tpg = {
	.support = SCSI_SUPPORT_FULL,
	.serv_action_valid = 1,
	.opcode = MAINTENANCE_OUT,
	.service_action = MO_SET_TARGET_PGS,
	.cdb_size = 12,
	.usage_bits = {MAINTENANCE_OUT, MO_SET_TARGET_PGS, 0x00, 0x00,
		       0x00, 0x00, 0xff, 0xff,
		       0xff, 0xff, 0x00, SCSI_CONTROL_MASK},
	.enabled = tcm_is_set_tpg_enabled,
};

static struct target_opcode_descriptor *tcm_supported_opcodes[] = {
	&tcm_opcode_read6,
	&tcm_opcode_read10,
	&tcm_opcode_read12,
	&tcm_opcode_read16,
	&tcm_opcode_write6,
	&tcm_opcode_write10,
	&tcm_opcode_write_verify10,
	&tcm_opcode_write12,
	&tcm_opcode_write16,
	&tcm_opcode_write_verify16,
	&tcm_opcode_write_same32,
	&tcm_opcode_compare_write,
	&tcm_opcode_read_capacity,
	&tcm_opcode_read_capacity16,
	&tcm_opcode_read_report_refferals,
	&tcm_opcode_sync_cache,
	&tcm_opcode_sync_cache16,
	&tcm_opcode_unmap,
	&tcm_opcode_write_same,
	&tcm_opcode_write_same16,
	&tcm_opcode_verify,
	&tcm_opcode_verify16,
	&tcm_opcode_start_stop,
	&tcm_opcode_mode_select,
	&tcm_opcode_mode_select10,
	&tcm_opcode_mode_sense,
	&tcm_opcode_mode_sense10,
	&tcm_opcode_pri_read_keys,
	&tcm_opcode_pri_read_resrv,
	&tcm_opcode_pri_read_caps,
	&tcm_opcode_pri_read_full_status,
	&tcm_opcode_pro_register,
	&tcm_opcode_pro_reserve,
	&tcm_opcode_pro_release,
	&tcm_opcode_pro_clear,
	&tcm_opcode_pro_preempt,
	&tcm_opcode_pro_preempt_abort,
	&tcm_opcode_pro_reg_ign_exist,
	&tcm_opcode_pro_register_move,
	&tcm_opcode_release,
	&tcm_opcode_release10,
	&tcm_opcode_reserve,
	&tcm_opcode_reserve10,
	&tcm_opcode_request_sense,
	&tcm_opcode_inquiry,
	&tcm_opcode_extended_copy_lid1,
	&tcm_opcode_rcv_copy_res_op_params,
	&tcm_opcode_report_luns,
	&tcm_opcode_test_unit_ready,
	&tcm_opcode_report_target_pgs,
	&tcm_opcode_report_supp_opcodes,
	&tcm_opcode_set_tpg,
};

static int
spc_rsoc_encode_command_timeouts_descriptor(unsigned char *buf, u8 ctdp,
				struct target_opcode_descriptor *descr)
{
	if (!ctdp)
		return 0;

	put_unaligned_be16(0xa, buf);
	buf[3] = descr->specific_timeout;
	put_unaligned_be32(descr->nominal_timeout, &buf[4]);
	put_unaligned_be32(descr->recommended_timeout, &buf[8]);

	return 12;
}

static int
spc_rsoc_encode_command_descriptor(unsigned char *buf, u8 ctdp,
				   struct target_opcode_descriptor *descr)
{
	int td_size = 0;

	buf[0] = descr->opcode;

	put_unaligned_be16(descr->service_action, &buf[2]);

	buf[5] = (ctdp << 1) | descr->serv_action_valid;
	put_unaligned_be16(descr->cdb_size, &buf[6]);

	td_size = spc_rsoc_encode_command_timeouts_descriptor(&buf[8], ctdp,
							      descr);

	return 8 + td_size;
}

static int
spc_rsoc_encode_one_command_descriptor(unsigned char *buf, u8 ctdp,
				       struct target_opcode_descriptor *descr,
				       struct se_device *dev)
{
	int td_size = 0;

	if (!descr) {
		buf[1] = (ctdp << 7) | SCSI_SUPPORT_NOT_SUPPORTED;
		return 2;
	}

	buf[1] = (ctdp << 7) | SCSI_SUPPORT_FULL;
	put_unaligned_be16(descr->cdb_size, &buf[2]);
	memcpy(&buf[4], descr->usage_bits, descr->cdb_size);
	if (descr->update_usage_bits)
		descr->update_usage_bits(&buf[4], dev);

	td_size = spc_rsoc_encode_command_timeouts_descriptor(
			&buf[4 + descr->cdb_size], ctdp, descr);

	return 4 + descr->cdb_size + td_size;
}

static sense_reason_t
spc_rsoc_get_descr(struct se_cmd *cmd, struct target_opcode_descriptor **opcode)
{
	struct target_opcode_descriptor *descr;
	struct se_session *sess = cmd->se_sess;
	unsigned char *cdb = cmd->t_task_cdb;
	u8 opts = cdb[2] & 0x3;
	u8 requested_opcode;
	u16 requested_sa;
	int i;

	requested_opcode = cdb[3];
	requested_sa = ((u16)cdb[4]) << 8 | cdb[5];
	*opcode = NULL;

	if (opts > 3) {
		pr_debug("TARGET_CORE[%s]: Invalid REPORT SUPPORTED OPERATION CODES"
			" with unsupported REPORTING OPTIONS %#x for 0x%08llx from %s\n",
			cmd->se_tfo->fabric_name, opts,
			cmd->se_lun->unpacked_lun,
			sess->se_node_acl->initiatorname);
		return TCM_INVALID_CDB_FIELD;
	}

	for (i = 0; i < ARRAY_SIZE(tcm_supported_opcodes); i++) {
		descr = tcm_supported_opcodes[i];
		if (descr->opcode != requested_opcode)
			continue;

		switch (opts) {
		case 0x1:
			/*
			 * If the REQUESTED OPERATION CODE field specifies an
			 * operation code for which the device server implements
			 * service actions, then the device server shall
			 * terminate the command with CHECK CONDITION status,
			 * with the sense key set to ILLEGAL REQUEST, and the
			 * additional sense code set to INVALID FIELD IN CDB
			 */
			if (descr->serv_action_valid)
				return TCM_INVALID_CDB_FIELD;

			if (!descr->enabled || descr->enabled(cmd))
				*opcode = descr;
			break;
		case 0x2:
			/*
			 * If the REQUESTED OPERATION CODE field specifies an
			 * operation code for which the device server does not
			 * implement service actions, then the device server
			 * shall terminate the command with CHECK CONDITION
			 * status, with the sense key set to ILLEGAL REQUEST,
			 * and the additional sense code set to INVALID FIELD IN CDB.
			 */
			if (descr->serv_action_valid &&
			    descr->service_action == requested_sa) {
				if (!descr->enabled || descr->enabled(cmd))
					*opcode = descr;
			} else if (!descr->serv_action_valid)
				return TCM_INVALID_CDB_FIELD;
			break;
		case 0x3:
			/*
			 * The command support data for the operation code and
			 * service action a specified in the REQUESTED OPERATION
			 * CODE field and REQUESTED SERVICE ACTION field shall
			 * be returned in the one_command parameter data format.
			 */
			if (descr->service_action == requested_sa)
				if (!descr->enabled || descr->enabled(cmd))
					*opcode = descr;
			break;
		}
	}

	return 0;
}

static sense_reason_t
spc_emulate_report_supp_op_codes(struct se_cmd *cmd)
{
	int descr_num = ARRAY_SIZE(tcm_supported_opcodes);
	struct target_opcode_descriptor *descr = NULL;
	unsigned char *cdb = cmd->t_task_cdb;
	u8 rctd = (cdb[2] >> 7) & 0x1;
	unsigned char *buf = NULL;
	int response_length = 0;
	u8 opts = cdb[2] & 0x3;
	unsigned char *rbuf;
	sense_reason_t ret = 0;
	int i;

	if (!cmd->se_dev->dev_attrib.emulate_rsoc)
		return TCM_UNSUPPORTED_SCSI_OPCODE;

	rbuf = transport_kmap_data_sg(cmd);
	if (cmd->data_length && !rbuf) {
		ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
		goto out;
	}

	if (opts == 0)
		response_length = 4 + (8 + rctd * 12) * descr_num;
	else {
		ret = spc_rsoc_get_descr(cmd, &descr);
		if (ret)
			goto out;

		if (descr)
			response_length = 4 + descr->cdb_size + rctd * 12;
		else
			response_length = 2;
	}

	buf = kzalloc(response_length, GFP_KERNEL);
	if (!buf) {
		ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
		goto out;
	}
	response_length = 0;

	if (opts == 0) {
		response_length += 4;

		for (i = 0; i < ARRAY_SIZE(tcm_supported_opcodes); i++) {
			descr = tcm_supported_opcodes[i];
			if (descr->enabled && !descr->enabled(cmd))
				continue;

			response_length += spc_rsoc_encode_command_descriptor(
					&buf[response_length], rctd, descr);
		}
		put_unaligned_be32(response_length - 3, buf);
	} else {
		response_length = spc_rsoc_encode_one_command_descriptor(
				&buf[response_length], rctd, descr,
				cmd->se_dev);
	}

	memcpy(rbuf, buf, min_t(u32, response_length, cmd->data_length));
out:
	kfree(buf);
	transport_kunmap_data_sg(cmd);

	if (!ret)
		target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, response_length);
	return ret;
}

sense_reason_t
spc_parse_cdb(struct se_cmd *cmd, unsigned int *size)
{
	struct se_device *dev = cmd->se_dev;
	unsigned char *cdb = cmd->t_task_cdb;

	if (!dev->dev_attrib.emulate_pr &&
	    ((cdb[0] == PERSISTENT_RESERVE_IN) ||
	     (cdb[0] == PERSISTENT_RESERVE_OUT) ||
	     (cdb[0] == RELEASE || cdb[0] == RELEASE_10) ||
	     (cdb[0] == RESERVE || cdb[0] == RESERVE_10))) {
		return TCM_UNSUPPORTED_SCSI_OPCODE;
	}

	switch (cdb[0]) {
	case MODE_SELECT:
		*size = cdb[4];
		cmd->execute_cmd = spc_emulate_modeselect;
		break;
	case MODE_SELECT_10:
		*size = get_unaligned_be16(&cdb[7]);
		cmd->execute_cmd = spc_emulate_modeselect;
		break;
	case MODE_SENSE:
		*size = cdb[4];
		cmd->execute_cmd = spc_emulate_modesense;
		break;
	case MODE_SENSE_10:
		*size = get_unaligned_be16(&cdb[7]);
		cmd->execute_cmd = spc_emulate_modesense;
		break;
	case LOG_SELECT:
	case LOG_SENSE:
		*size = get_unaligned_be16(&cdb[7]);
		break;
	case PERSISTENT_RESERVE_IN:
		*size = get_unaligned_be16(&cdb[7]);
		cmd->execute_cmd = target_scsi3_emulate_pr_in;
		break;
	case PERSISTENT_RESERVE_OUT:
		*size = get_unaligned_be32(&cdb[5]);
		cmd->execute_cmd = target_scsi3_emulate_pr_out;
		break;
	case RELEASE:
	case RELEASE_10:
		if (cdb[0] == RELEASE_10)
			*size = get_unaligned_be16(&cdb[7]);
		else
			*size = cmd->data_length;

		cmd->execute_cmd = target_scsi2_reservation_release;
		break;
	case RESERVE:
	case RESERVE_10:
		/*
		 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
		 * Assume the passthrough or $FABRIC_MOD will tell us about it.
		 */
		if (cdb[0] == RESERVE_10)
			*size = get_unaligned_be16(&cdb[7]);
		else
			*size = cmd->data_length;

		cmd->execute_cmd = target_scsi2_reservation_reserve;
		break;
	case REQUEST_SENSE:
		*size = cdb[4];
		cmd->execute_cmd = spc_emulate_request_sense;
		break;
	case INQUIRY:
		*size = get_unaligned_be16(&cdb[3]);

		/*
		 * Do implicit HEAD_OF_QUEUE processing for INQUIRY.
		 * See spc4r17 section 5.3
		 */
		cmd->sam_task_attr = TCM_HEAD_TAG;
		cmd->execute_cmd = spc_emulate_inquiry;
		break;
	case SECURITY_PROTOCOL_IN:
	case SECURITY_PROTOCOL_OUT:
		*size = get_unaligned_be32(&cdb[6]);
		break;
	case EXTENDED_COPY:
		*size = get_unaligned_be32(&cdb[10]);
		cmd->execute_cmd = target_do_xcopy;
		break;
	case RECEIVE_COPY_RESULTS:
		*size = get_unaligned_be32(&cdb[10]);
		cmd->execute_cmd = target_do_receive_copy_results;
		break;
	case READ_ATTRIBUTE:
	case WRITE_ATTRIBUTE:
		*size = get_unaligned_be32(&cdb[10]);
		break;
	case RECEIVE_DIAGNOSTIC:
	case SEND_DIAGNOSTIC:
		*size = get_unaligned_be16(&cdb[3]);
		break;
	case WRITE_BUFFER:
		*size = get_unaligned_be24(&cdb[6]);
		break;
	case REPORT_LUNS:
		cmd->execute_cmd = spc_emulate_report_luns;
		*size = get_unaligned_be32(&cdb[6]);
		/*
		 * Do implicit HEAD_OF_QUEUE processing for REPORT_LUNS
		 * See spc4r17 section 5.3
		 */
		cmd->sam_task_attr = TCM_HEAD_TAG;
		break;
	case TEST_UNIT_READY:
		cmd->execute_cmd = spc_emulate_testunitready;
		*size = 0;
		break;
	case MAINTENANCE_IN:
		if (dev->transport->get_device_type(dev) != TYPE_ROM) {
			/*
			 * MAINTENANCE_IN from SCC-2
			 * Check for emulated MI_REPORT_TARGET_PGS
			 */
			if ((cdb[1] & 0x1f) == MI_REPORT_TARGET_PGS) {
				cmd->execute_cmd =
					target_emulate_report_target_port_groups;
			}
			if ((cdb[1] & 0x1f) ==
			    MI_REPORT_SUPPORTED_OPERATION_CODES)
				cmd->execute_cmd =
					spc_emulate_report_supp_op_codes;
			*size = get_unaligned_be32(&cdb[6]);
		} else {
			/*
			 * GPCMD_SEND_KEY from multi media commands
			 */
			*size = get_unaligned_be16(&cdb[8]);
		}
		break;
	case MAINTENANCE_OUT:
		if (dev->transport->get_device_type(dev) != TYPE_ROM) {
			/*
			 * MAINTENANCE_OUT from SCC-2
			 * Check for emulated MO_SET_TARGET_PGS.
			 */
			if (cdb[1] == MO_SET_TARGET_PGS) {
				cmd->execute_cmd =
					target_emulate_set_target_port_groups;
			}
			*size = get_unaligned_be32(&cdb[6]);
		} else {
			/*
			 * GPCMD_SEND_KEY from multi media commands
			 */
			*size = get_unaligned_be16(&cdb[8]);
		}
		break;
	default:
		return TCM_UNSUPPORTED_SCSI_OPCODE;
	}

	return 0;
}
EXPORT_SYMBOL(spc_parse_cdb);