summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/osd/osd_initiator.c
blob: aa66361ed44b71772da913c74c69640b43909f23 (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
/*
 * osd_initiator - Main body of the osd initiator library.
 *
 * Note: The file does not contain the advanced security functionality which
 * is only needed by the security_manager's initiators.
 *
 * Copyright (C) 2008 Panasas Inc.  All rights reserved.
 *
 * Authors:
 *   Boaz Harrosh <bharrosh@panasas.com>
 *   Benny Halevy <bhalevy@panasas.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. Neither the name of the Panasas company nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <linux/slab.h>
#include <linux/module.h>

#include <scsi/osd_initiator.h>
#include <scsi/osd_sec.h>
#include <scsi/osd_attributes.h>
#include <scsi/osd_sense.h>

#include <scsi/scsi_device.h>

#include "osd_debug.h"

#ifndef __unused
#    define __unused			__attribute__((unused))
#endif

enum { OSD_REQ_RETRIES = 1 };

MODULE_AUTHOR("Boaz Harrosh <bharrosh@panasas.com>");
MODULE_DESCRIPTION("open-osd initiator library libosd.ko");
MODULE_LICENSE("GPL");

static inline void build_test(void)
{
	/* structures were not packed */
	BUILD_BUG_ON(sizeof(struct osd_capability) != OSD_CAP_LEN);
	BUILD_BUG_ON(sizeof(struct osdv2_cdb) != OSD_TOTAL_CDB_LEN);
	BUILD_BUG_ON(sizeof(struct osdv1_cdb) != OSDv1_TOTAL_CDB_LEN);
}

static const char *_osd_ver_desc(struct osd_request *or)
{
	return osd_req_is_ver1(or) ? "OSD1" : "OSD2";
}

#define ATTR_DEF_RI(id, len) ATTR_DEF(OSD_APAGE_ROOT_INFORMATION, id, len)

static int _osd_get_print_system_info(struct osd_dev *od,
	void *caps, struct osd_dev_info *odi)
{
	struct osd_request *or;
	struct osd_attr get_attrs[] = {
		ATTR_DEF_RI(OSD_ATTR_RI_VENDOR_IDENTIFICATION, 8),
		ATTR_DEF_RI(OSD_ATTR_RI_PRODUCT_IDENTIFICATION, 16),
		ATTR_DEF_RI(OSD_ATTR_RI_PRODUCT_MODEL, 32),
		ATTR_DEF_RI(OSD_ATTR_RI_PRODUCT_REVISION_LEVEL, 4),
		ATTR_DEF_RI(OSD_ATTR_RI_PRODUCT_SERIAL_NUMBER, 64 /*variable*/),
		ATTR_DEF_RI(OSD_ATTR_RI_OSD_NAME, 64 /*variable*/),
		ATTR_DEF_RI(OSD_ATTR_RI_TOTAL_CAPACITY, 8),
		ATTR_DEF_RI(OSD_ATTR_RI_USED_CAPACITY, 8),
		ATTR_DEF_RI(OSD_ATTR_RI_NUMBER_OF_PARTITIONS, 8),
		ATTR_DEF_RI(OSD_ATTR_RI_CLOCK, 6),
		/* IBM-OSD-SIM Has a bug with this one put it last */
		ATTR_DEF_RI(OSD_ATTR_RI_OSD_SYSTEM_ID, 20),
	};
	void *iter = NULL, *pFirst;
	int nelem = ARRAY_SIZE(get_attrs), a = 0;
	int ret;

	or = osd_start_request(od, GFP_KERNEL);
	if (!or)
		return -ENOMEM;

	/* get attrs */
	osd_req_get_attributes(or, &osd_root_object);
	osd_req_add_get_attr_list(or, get_attrs, ARRAY_SIZE(get_attrs));

	ret = osd_finalize_request(or, 0, caps, NULL);
	if (ret)
		goto out;

	ret = osd_execute_request(or);
	if (ret) {
		OSD_ERR("Failed to detect %s => %d\n", _osd_ver_desc(or), ret);
		goto out;
	}

	osd_req_decode_get_attr_list(or, get_attrs, &nelem, &iter);

	OSD_INFO("Detected %s device\n",
		_osd_ver_desc(or));

	pFirst = get_attrs[a++].val_ptr;
	OSD_INFO("VENDOR_IDENTIFICATION  [%s]\n",
		(char *)pFirst);

	pFirst = get_attrs[a++].val_ptr;
	OSD_INFO("PRODUCT_IDENTIFICATION [%s]\n",
		(char *)pFirst);

	pFirst = get_attrs[a++].val_ptr;
	OSD_INFO("PRODUCT_MODEL          [%s]\n",
		(char *)pFirst);

	pFirst = get_attrs[a++].val_ptr;
	OSD_INFO("PRODUCT_REVISION_LEVEL [%u]\n",
		pFirst ? get_unaligned_be32(pFirst) : ~0U);

	pFirst = get_attrs[a++].val_ptr;
	OSD_INFO("PRODUCT_SERIAL_NUMBER  [%s]\n",
		(char *)pFirst);

	odi->osdname_len = get_attrs[a].len;
	/* Avoid NULL for memcmp optimization 0-length is good enough */
	odi->osdname = kzalloc(odi->osdname_len + 1, GFP_KERNEL);
	if (!odi->osdname) {
		ret = -ENOMEM;
		goto out;
	}
	if (odi->osdname_len)
		memcpy(odi->osdname, get_attrs[a].val_ptr, odi->osdname_len);
	OSD_INFO("OSD_NAME               [%s]\n", odi->osdname);
	a++;

	pFirst = get_attrs[a++].val_ptr;
	OSD_INFO("TOTAL_CAPACITY         [0x%llx]\n",
		pFirst ? _LLU(get_unaligned_be64(pFirst)) : ~0ULL);

	pFirst = get_attrs[a++].val_ptr;
	OSD_INFO("USED_CAPACITY          [0x%llx]\n",
		pFirst ? _LLU(get_unaligned_be64(pFirst)) : ~0ULL);

	pFirst = get_attrs[a++].val_ptr;
	OSD_INFO("NUMBER_OF_PARTITIONS   [%llu]\n",
		pFirst ? _LLU(get_unaligned_be64(pFirst)) : ~0ULL);

	if (a >= nelem)
		goto out;

	/* FIXME: Where are the time utilities */
	pFirst = get_attrs[a++].val_ptr;
	OSD_INFO("CLOCK                  [0x%02x%02x%02x%02x%02x%02x]\n",
		((char *)pFirst)[0], ((char *)pFirst)[1],
		((char *)pFirst)[2], ((char *)pFirst)[3],
		((char *)pFirst)[4], ((char *)pFirst)[5]);

	if (a < nelem) { /* IBM-OSD-SIM bug, Might not have it */
		unsigned len = get_attrs[a].len;
		char sid_dump[32*4 + 2]; /* 2nibbles+space+ASCII */

		hex_dump_to_buffer(get_attrs[a].val_ptr, len, 32, 1,
				   sid_dump, sizeof(sid_dump), true);
		OSD_INFO("OSD_SYSTEM_ID(%d)\n"
			 "        [%s]\n", len, sid_dump);

		if (unlikely(len > sizeof(odi->systemid))) {
			OSD_ERR("OSD Target error: OSD_SYSTEM_ID too long(%d). "
				"device idetification might not work\n", len);
			len = sizeof(odi->systemid);
		}
		odi->systemid_len = len;
		memcpy(odi->systemid, get_attrs[a].val_ptr, len);
		a++;
	}
out:
	osd_end_request(or);
	return ret;
}

int osd_auto_detect_ver(struct osd_dev *od,
	void *caps, struct osd_dev_info *odi)
{
	int ret;

	/* Auto-detect the osd version */
	ret = _osd_get_print_system_info(od, caps, odi);
	if (ret) {
		osd_dev_set_ver(od, OSD_VER1);
		OSD_DEBUG("converting to OSD1\n");
		ret = _osd_get_print_system_info(od, caps, odi);
	}

	return ret;
}
EXPORT_SYMBOL(osd_auto_detect_ver);

static unsigned _osd_req_cdb_len(struct osd_request *or)
{
	return osd_req_is_ver1(or) ? OSDv1_TOTAL_CDB_LEN : OSD_TOTAL_CDB_LEN;
}

static unsigned _osd_req_alist_elem_size(struct osd_request *or, unsigned len)
{
	return osd_req_is_ver1(or) ?
		osdv1_attr_list_elem_size(len) :
		osdv2_attr_list_elem_size(len);
}

static void _osd_req_alist_elem_encode(struct osd_request *or,
	void *attr_last, const struct osd_attr *oa)
{
	if (osd_req_is_ver1(or)) {
		struct osdv1_attributes_list_element *attr = attr_last;

		attr->attr_page = cpu_to_be32(oa->attr_page);
		attr->attr_id = cpu_to_be32(oa->attr_id);
		attr->attr_bytes = cpu_to_be16(oa->len);
		memcpy(attr->attr_val, oa->val_ptr, oa->len);
	} else {
		struct osdv2_attributes_list_element *attr = attr_last;

		attr->attr_page = cpu_to_be32(oa->attr_page);
		attr->attr_id = cpu_to_be32(oa->attr_id);
		attr->attr_bytes = cpu_to_be16(oa->len);
		memcpy(attr->attr_val, oa->val_ptr, oa->len);
	}
}

static int _osd_req_alist_elem_decode(struct osd_request *or,
	void *cur_p, struct osd_attr *oa, unsigned max_bytes)
{
	unsigned inc;
	if (osd_req_is_ver1(or)) {
		struct osdv1_attributes_list_element *attr = cur_p;

		if (max_bytes < sizeof(*attr))
			return -1;

		oa->len = be16_to_cpu(attr->attr_bytes);
		inc = _osd_req_alist_elem_size(or, oa->len);
		if (inc > max_bytes)
			return -1;

		oa->attr_page = be32_to_cpu(attr->attr_page);
		oa->attr_id = be32_to_cpu(attr->attr_id);

		/* OSD1: On empty attributes we return a pointer to 2 bytes
		 * of zeros. This keeps similar behaviour with OSD2.
		 * (See below)
		 */
		oa->val_ptr = likely(oa->len) ? attr->attr_val :
						(u8 *)&attr->attr_bytes;
	} else {
		struct osdv2_attributes_list_element *attr = cur_p;

		if (max_bytes < sizeof(*attr))
			return -1;

		oa->len = be16_to_cpu(attr->attr_bytes);
		inc = _osd_req_alist_elem_size(or, oa->len);
		if (inc > max_bytes)
			return -1;

		oa->attr_page = be32_to_cpu(attr->attr_page);
		oa->attr_id = be32_to_cpu(attr->attr_id);

		/* OSD2: For convenience, on empty attributes, we return 8 bytes
		 * of zeros here. This keeps the same behaviour with OSD2r04,
		 * and is nice with null terminating ASCII fields.
		 * oa->val_ptr == NULL marks the end-of-list, or error.
		 */
		oa->val_ptr = likely(oa->len) ? attr->attr_val : attr->reserved;
	}
	return inc;
}

static unsigned _osd_req_alist_size(struct osd_request *or, void *list_head)
{
	return osd_req_is_ver1(or) ?
		osdv1_list_size(list_head) :
		osdv2_list_size(list_head);
}

static unsigned _osd_req_sizeof_alist_header(struct osd_request *or)
{
	return osd_req_is_ver1(or) ?
		sizeof(struct osdv1_attributes_list_header) :
		sizeof(struct osdv2_attributes_list_header);
}

static void _osd_req_set_alist_type(struct osd_request *or,
	void *list, int list_type)
{
	if (osd_req_is_ver1(or)) {
		struct osdv1_attributes_list_header *attr_list = list;

		memset(attr_list, 0, sizeof(*attr_list));
		attr_list->type = list_type;
	} else {
		struct osdv2_attributes_list_header *attr_list = list;

		memset(attr_list, 0, sizeof(*attr_list));
		attr_list->type = list_type;
	}
}

static bool _osd_req_is_alist_type(struct osd_request *or,
	void *list, int list_type)
{
	if (!list)
		return false;

	if (osd_req_is_ver1(or)) {
		struct osdv1_attributes_list_header *attr_list = list;

		return attr_list->type == list_type;
	} else {
		struct osdv2_attributes_list_header *attr_list = list;

		return attr_list->type == list_type;
	}
}

/* This is for List-objects not Attributes-Lists */
static void _osd_req_encode_olist(struct osd_request *or,
	struct osd_obj_id_list *list)
{
	struct osd_cdb_head *cdbh = osd_cdb_head(&or->cdb);

	if (osd_req_is_ver1(or)) {
		cdbh->v1.list_identifier = list->list_identifier;
		cdbh->v1.start_address = list->continuation_id;
	} else {
		cdbh->v2.list_identifier = list->list_identifier;
		cdbh->v2.start_address = list->continuation_id;
	}
}

static osd_cdb_offset osd_req_encode_offset(struct osd_request *or,
	u64 offset, unsigned *padding)
{
	return __osd_encode_offset(offset, padding,
			osd_req_is_ver1(or) ?
				OSDv1_OFFSET_MIN_SHIFT : OSD_OFFSET_MIN_SHIFT,
			OSD_OFFSET_MAX_SHIFT);
}

static struct osd_security_parameters *
_osd_req_sec_params(struct osd_request *or)
{
	struct osd_cdb *ocdb = &or->cdb;

	if (osd_req_is_ver1(or))
		return (struct osd_security_parameters *)&ocdb->v1.sec_params;
	else
		return (struct osd_security_parameters *)&ocdb->v2.sec_params;
}

void osd_dev_init(struct osd_dev *osdd, struct scsi_device *scsi_device)
{
	memset(osdd, 0, sizeof(*osdd));
	osdd->scsi_device = scsi_device;
	osdd->def_timeout = BLK_DEFAULT_SG_TIMEOUT;
#ifdef OSD_VER1_SUPPORT
	osdd->version = OSD_VER2;
#endif
	/* TODO: Allocate pools for osd_request attributes ... */
}
EXPORT_SYMBOL(osd_dev_init);

void osd_dev_fini(struct osd_dev *osdd)
{
	/* TODO: De-allocate pools */

	osdd->scsi_device = NULL;
}
EXPORT_SYMBOL(osd_dev_fini);

static struct osd_request *_osd_request_alloc(gfp_t gfp)
{
	struct osd_request *or;

	/* TODO: Use mempool with one saved request */
	or = kzalloc(sizeof(*or), gfp);
	return or;
}

static void _osd_request_free(struct osd_request *or)
{
	kfree(or);
}

struct osd_request *osd_start_request(struct osd_dev *dev, gfp_t gfp)
{
	struct osd_request *or;

	or = _osd_request_alloc(gfp);
	if (!or)
		return NULL;

	or->osd_dev = dev;
	or->alloc_flags = gfp;
	or->timeout = dev->def_timeout;
	or->retries = OSD_REQ_RETRIES;

	return or;
}
EXPORT_SYMBOL(osd_start_request);

static void _osd_free_seg(struct osd_request *or __unused,
	struct _osd_req_data_segment *seg)
{
	if (!seg->buff || !seg->alloc_size)
		return;

	kfree(seg->buff);
	seg->buff = NULL;
	seg->alloc_size = 0;
}

static void _put_request(struct request *rq)
{
	/*
	 * If osd_finalize_request() was called but the request was not
	 * executed through the block layer, then we must release BIOs.
	 * TODO: Keep error code in or->async_error. Need to audit all
	 *       code paths.
	 */
	if (unlikely(rq->bio))
		blk_end_request(rq, -ENOMEM, blk_rq_bytes(rq));
	else
		blk_put_request(rq);
}

void osd_end_request(struct osd_request *or)
{
	struct request *rq = or->request;

	if (rq) {
		if (rq->next_rq) {
			_put_request(rq->next_rq);
			rq->next_rq = NULL;
		}

		_put_request(rq);
	}

	_osd_free_seg(or, &or->get_attr);
	_osd_free_seg(or, &or->enc_get_attr);
	_osd_free_seg(or, &or->set_attr);
	_osd_free_seg(or, &or->cdb_cont);

	_osd_request_free(or);
}
EXPORT_SYMBOL(osd_end_request);

static void _set_error_resid(struct osd_request *or, struct request *req,
			     int error)
{
	or->async_error = error;
	or->req_errors = req->errors ? : error;
	or->sense_len = req->sense_len;
	if (or->out.req)
		or->out.residual = or->out.req->resid_len;
	if (or->in.req)
		or->in.residual = or->in.req->resid_len;
}

int osd_execute_request(struct osd_request *or)
{
	int error = blk_execute_rq(or->request->q, NULL, or->request, 0);

	_set_error_resid(or, or->request, error);
	return error;
}
EXPORT_SYMBOL(osd_execute_request);

static void osd_request_async_done(struct request *req, int error)
{
	struct osd_request *or = req->end_io_data;

	_set_error_resid(or, req, error);
	if (req->next_rq) {
		__blk_put_request(req->q, req->next_rq);
		req->next_rq = NULL;
	}

	__blk_put_request(req->q, req);
	or->request = NULL;
	or->in.req = NULL;
	or->out.req = NULL;

	if (or->async_done)
		or->async_done(or, or->async_private);
	else
		osd_end_request(or);
}

int osd_execute_request_async(struct osd_request *or,
	osd_req_done_fn *done, void *private)
{
	or->request->end_io_data = or;
	or->async_private = private;
	or->async_done = done;

	blk_execute_rq_nowait(or->request->q, NULL, or->request, 0,
			      osd_request_async_done);
	return 0;
}
EXPORT_SYMBOL(osd_execute_request_async);

u8 sg_out_pad_buffer[1 << OSDv1_OFFSET_MIN_SHIFT];
u8 sg_in_pad_buffer[1 << OSDv1_OFFSET_MIN_SHIFT];

static int _osd_realloc_seg(struct osd_request *or,
	struct _osd_req_data_segment *seg, unsigned max_bytes)
{
	void *buff;

	if (seg->alloc_size >= max_bytes)
		return 0;

	buff = krealloc(seg->buff, max_bytes, or->alloc_flags);
	if (!buff) {
		OSD_ERR("Failed to Realloc %d-bytes was-%d\n", max_bytes,
			seg->alloc_size);
		return -ENOMEM;
	}

	memset(buff + seg->alloc_size, 0, max_bytes - seg->alloc_size);
	seg->buff = buff;
	seg->alloc_size = max_bytes;
	return 0;
}

static int _alloc_cdb_cont(struct osd_request *or, unsigned total_bytes)
{
	OSD_DEBUG("total_bytes=%d\n", total_bytes);
	return _osd_realloc_seg(or, &or->cdb_cont, total_bytes);
}

static int _alloc_set_attr_list(struct osd_request *or,
	const struct osd_attr *oa, unsigned nelem, unsigned add_bytes)
{
	unsigned total_bytes = add_bytes;

	for (; nelem; --nelem, ++oa)
		total_bytes += _osd_req_alist_elem_size(or, oa->len);

	OSD_DEBUG("total_bytes=%d\n", total_bytes);
	return _osd_realloc_seg(or, &or->set_attr, total_bytes);
}

static int _alloc_get_attr_desc(struct osd_request *or, unsigned max_bytes)
{
	OSD_DEBUG("total_bytes=%d\n", max_bytes);
	return _osd_realloc_seg(or, &or->enc_get_attr, max_bytes);
}

static int _alloc_get_attr_list(struct osd_request *or)
{
	OSD_DEBUG("total_bytes=%d\n", or->get_attr.total_bytes);
	return _osd_realloc_seg(or, &or->get_attr, or->get_attr.total_bytes);
}

/*
 * Common to all OSD commands
 */

static void _osdv1_req_encode_common(struct osd_request *or,
	__be16 act, const struct osd_obj_id *obj, u64 offset, u64 len)
{
	struct osdv1_cdb *ocdb = &or->cdb.v1;

	/*
	 * For speed, the commands
	 *	OSD_ACT_PERFORM_SCSI_COMMAND	, V1 0x8F7E, V2 0x8F7C
	 *	OSD_ACT_SCSI_TASK_MANAGEMENT	, V1 0x8F7F, V2 0x8F7D
	 * are not supported here. Should pass zero and set after the call
	 */
	act &= cpu_to_be16(~0x0080); /* V1 action code */

	OSD_DEBUG("OSDv1 execute opcode 0x%x\n", be16_to_cpu(act));

	ocdb->h.varlen_cdb.opcode = VARIABLE_LENGTH_CMD;
	ocdb->h.varlen_cdb.additional_cdb_length = OSD_ADDITIONAL_CDB_LENGTH;
	ocdb->h.varlen_cdb.service_action = act;

	ocdb->h.partition = cpu_to_be64(obj->partition);
	ocdb->h.object = cpu_to_be64(obj->id);
	ocdb->h.v1.length = cpu_to_be64(len);
	ocdb->h.v1.start_address = cpu_to_be64(offset);
}

static void _osdv2_req_encode_common(struct osd_request *or,
	 __be16 act, const struct osd_obj_id *obj, u64 offset, u64 len)
{
	struct osdv2_cdb *ocdb = &or->cdb.v2;

	OSD_DEBUG("OSDv2 execute opcode 0x%x\n", be16_to_cpu(act));

	ocdb->h.varlen_cdb.opcode = VARIABLE_LENGTH_CMD;
	ocdb->h.varlen_cdb.additional_cdb_length = OSD_ADDITIONAL_CDB_LENGTH;
	ocdb->h.varlen_cdb.service_action = act;

	ocdb->h.partition = cpu_to_be64(obj->partition);
	ocdb->h.object = cpu_to_be64(obj->id);
	ocdb->h.v2.length = cpu_to_be64(len);
	ocdb->h.v2.start_address = cpu_to_be64(offset);
}

static void _osd_req_encode_common(struct osd_request *or,
	__be16 act, const struct osd_obj_id *obj, u64 offset, u64 len)
{
	if (osd_req_is_ver1(or))
		_osdv1_req_encode_common(or, act, obj, offset, len);
	else
		_osdv2_req_encode_common(or, act, obj, offset, len);
}

/*
 * Device commands
 */
/*TODO: void osd_req_set_master_seed_xchg(struct osd_request *, ...); */
/*TODO: void osd_req_set_master_key(struct osd_request *, ...); */

void osd_req_format(struct osd_request *or, u64 tot_capacity)
{
	_osd_req_encode_common(or, OSD_ACT_FORMAT_OSD, &osd_root_object, 0,
				tot_capacity);
}
EXPORT_SYMBOL(osd_req_format);

int osd_req_list_dev_partitions(struct osd_request *or,
	osd_id initial_id, struct osd_obj_id_list *list, unsigned nelem)
{
	return osd_req_list_partition_objects(or, 0, initial_id, list, nelem);
}
EXPORT_SYMBOL(osd_req_list_dev_partitions);

static void _osd_req_encode_flush(struct osd_request *or,
	enum osd_options_flush_scope_values op)
{
	struct osd_cdb_head *ocdb = osd_cdb_head(&or->cdb);

	ocdb->command_specific_options = op;
}

void osd_req_flush_obsd(struct osd_request *or,
	enum osd_options_flush_scope_values op)
{
	_osd_req_encode_common(or, OSD_ACT_FLUSH_OSD, &osd_root_object, 0, 0);
	_osd_req_encode_flush(or, op);
}
EXPORT_SYMBOL(osd_req_flush_obsd);

/*TODO: void osd_req_perform_scsi_command(struct osd_request *,
	const u8 *cdb, ...); */
/*TODO: void osd_req_task_management(struct osd_request *, ...); */

/*
 * Partition commands
 */
static void _osd_req_encode_partition(struct osd_request *or,
	__be16 act, osd_id partition)
{
	struct osd_obj_id par = {
		.partition = partition,
		.id = 0,
	};

	_osd_req_encode_common(or, act, &par, 0, 0);
}

void osd_req_create_partition(struct osd_request *or, osd_id partition)
{
	_osd_req_encode_partition(or, OSD_ACT_CREATE_PARTITION, partition);
}
EXPORT_SYMBOL(osd_req_create_partition);

void osd_req_remove_partition(struct osd_request *or, osd_id partition)
{
	_osd_req_encode_partition(or, OSD_ACT_REMOVE_PARTITION, partition);
}
EXPORT_SYMBOL(osd_req_remove_partition);

/*TODO: void osd_req_set_partition_key(struct osd_request *,
	osd_id partition, u8 new_key_id[OSD_CRYPTO_KEYID_SIZE],
	u8 seed[OSD_CRYPTO_SEED_SIZE]); */

static int _osd_req_list_objects(struct osd_request *or,
	__be16 action, const struct osd_obj_id *obj, osd_id initial_id,
	struct osd_obj_id_list *list, unsigned nelem)
{
	struct request_queue *q = osd_request_queue(or->osd_dev);
	u64 len = nelem * sizeof(osd_id) + sizeof(*list);
	struct bio *bio;

	_osd_req_encode_common(or, action, obj, (u64)initial_id, len);

	if (list->list_identifier)
		_osd_req_encode_olist(or, list);

	WARN_ON(or->in.bio);
	bio = bio_map_kern(q, list, len, or->alloc_flags);
	if (IS_ERR(bio)) {
		OSD_ERR("!!! Failed to allocate list_objects BIO\n");
		return PTR_ERR(bio);
	}

	bio->bi_rw &= ~REQ_WRITE;
	or->in.bio = bio;
	or->in.total_bytes = bio->bi_size;
	return 0;
}

int osd_req_list_partition_collections(struct osd_request *or,
	osd_id partition, osd_id initial_id, struct osd_obj_id_list *list,
	unsigned nelem)
{
	struct osd_obj_id par = {
		.partition = partition,
		.id = 0,
	};

	return osd_req_list_collection_objects(or, &par, initial_id, list,
					       nelem);
}
EXPORT_SYMBOL(osd_req_list_partition_collections);

int osd_req_list_partition_objects(struct osd_request *or,
	osd_id partition, osd_id initial_id, struct osd_obj_id_list *list,
	unsigned nelem)
{
	struct osd_obj_id par = {
		.partition = partition,
		.id = 0,
	};

	return _osd_req_list_objects(or, OSD_ACT_LIST, &par, initial_id, list,
				     nelem);
}
EXPORT_SYMBOL(osd_req_list_partition_objects);

void osd_req_flush_partition(struct osd_request *or,
	osd_id partition, enum osd_options_flush_scope_values op)
{
	_osd_req_encode_partition(or, OSD_ACT_FLUSH_PARTITION, partition);
	_osd_req_encode_flush(or, op);
}
EXPORT_SYMBOL(osd_req_flush_partition);

/*
 * Collection commands
 */
/*TODO: void osd_req_create_collection(struct osd_request *,
	const struct osd_obj_id *); */
/*TODO: void osd_req_remove_collection(struct osd_request *,
	const struct osd_obj_id *); */

int osd_req_list_collection_objects(struct osd_request *or,
	const struct osd_obj_id *obj, osd_id initial_id,
	struct osd_obj_id_list *list, unsigned nelem)
{
	return _osd_req_list_objects(or, OSD_ACT_LIST_COLLECTION, obj,
				     initial_id, list, nelem);
}
EXPORT_SYMBOL(osd_req_list_collection_objects);

/*TODO: void query(struct osd_request *, ...); V2 */

void osd_req_flush_collection(struct osd_request *or,
	const struct osd_obj_id *obj, enum osd_options_flush_scope_values op)
{
	_osd_req_encode_common(or, OSD_ACT_FLUSH_PARTITION, obj, 0, 0);
	_osd_req_encode_flush(or, op);
}
EXPORT_SYMBOL(osd_req_flush_collection);

/*TODO: void get_member_attrs(struct osd_request *, ...); V2 */
/*TODO: void set_member_attrs(struct osd_request *, ...); V2 */

/*
 * Object commands
 */
void osd_req_create_object(struct osd_request *or, struct osd_obj_id *obj)
{
	_osd_req_encode_common(or, OSD_ACT_CREATE, obj, 0, 0);
}
EXPORT_SYMBOL(osd_req_create_object);

void osd_req_remove_object(struct osd_request *or, struct osd_obj_id *obj)
{
	_osd_req_encode_common(or, OSD_ACT_REMOVE, obj, 0, 0);
}
EXPORT_SYMBOL(osd_req_remove_object);


/*TODO: void osd_req_create_multi(struct osd_request *or,
	struct osd_obj_id *first, struct osd_obj_id_list *list, unsigned nelem);
*/

void osd_req_write(struct osd_request *or,
	const struct osd_obj_id *obj, u64 offset,
	struct bio *bio, u64 len)
{
	_osd_req_encode_common(or, OSD_ACT_WRITE, obj, offset, len);
	WARN_ON(or->out.bio || or->out.total_bytes);
	WARN_ON(0 == (bio->bi_rw & REQ_WRITE));
	or->out.bio = bio;
	or->out.total_bytes = len;
}
EXPORT_SYMBOL(osd_req_write);

int osd_req_write_kern(struct osd_request *or,
	const struct osd_obj_id *obj, u64 offset, void* buff, u64 len)
{
	struct request_queue *req_q = osd_request_queue(or->osd_dev);
	struct bio *bio = bio_map_kern(req_q, buff, len, GFP_KERNEL);

	if (IS_ERR(bio))
		return PTR_ERR(bio);

	bio->bi_rw |= REQ_WRITE; /* FIXME: bio_set_dir() */
	osd_req_write(or, obj, offset, bio, len);
	return 0;
}
EXPORT_SYMBOL(osd_req_write_kern);

/*TODO: void osd_req_append(struct osd_request *,
	const struct osd_obj_id *, struct bio *data_out); */
/*TODO: void osd_req_create_write(struct osd_request *,
	const struct osd_obj_id *, struct bio *data_out, u64 offset); */
/*TODO: void osd_req_clear(struct osd_request *,
	const struct osd_obj_id *, u64 offset, u64 len); */
/*TODO: void osd_req_punch(struct osd_request *,
	const struct osd_obj_id *, u64 offset, u64 len); V2 */

void osd_req_flush_object(struct osd_request *or,
	const struct osd_obj_id *obj, enum osd_options_flush_scope_values op,
	/*V2*/ u64 offset, /*V2*/ u64 len)
{
	if (unlikely(osd_req_is_ver1(or) && (offset || len))) {
		OSD_DEBUG("OSD Ver1 flush on specific range ignored\n");
		offset = 0;
		len = 0;
	}

	_osd_req_encode_common(or, OSD_ACT_FLUSH, obj, offset, len);
	_osd_req_encode_flush(or, op);
}
EXPORT_SYMBOL(osd_req_flush_object);

void osd_req_read(struct osd_request *or,
	const struct osd_obj_id *obj, u64 offset,
	struct bio *bio, u64 len)
{
	_osd_req_encode_common(or, OSD_ACT_READ, obj, offset, len);
	WARN_ON(or->in.bio || or->in.total_bytes);
	WARN_ON(bio->bi_rw & REQ_WRITE);
	or->in.bio = bio;
	or->in.total_bytes = len;
}
EXPORT_SYMBOL(osd_req_read);

int osd_req_read_kern(struct osd_request *or,
	const struct osd_obj_id *obj, u64 offset, void* buff, u64 len)
{
	struct request_queue *req_q = osd_request_queue(or->osd_dev);
	struct bio *bio = bio_map_kern(req_q, buff, len, GFP_KERNEL);

	if (IS_ERR(bio))
		return PTR_ERR(bio);

	osd_req_read(or, obj, offset, bio, len);
	return 0;
}
EXPORT_SYMBOL(osd_req_read_kern);

static int _add_sg_continuation_descriptor(struct osd_request *or,
	const struct osd_sg_entry *sglist, unsigned numentries, u64 *len)
{
	struct osd_sg_continuation_descriptor *oscd;
	u32 oscd_size;
	unsigned i;
	int ret;

	oscd_size = sizeof(*oscd) + numentries * sizeof(oscd->entries[0]);

	if (!or->cdb_cont.total_bytes) {
		/* First time, jump over the header, we will write to:
		 *	cdb_cont.buff + cdb_cont.total_bytes
		 */
		or->cdb_cont.total_bytes =
				sizeof(struct osd_continuation_segment_header);
	}

	ret = _alloc_cdb_cont(or, or->cdb_cont.total_bytes + oscd_size);
	if (unlikely(ret))
		return ret;

	oscd = or->cdb_cont.buff + or->cdb_cont.total_bytes;
	oscd->hdr.type = cpu_to_be16(SCATTER_GATHER_LIST);
	oscd->hdr.pad_length = 0;
	oscd->hdr.length = cpu_to_be32(oscd_size - sizeof(*oscd));

	*len = 0;
	/* copy the sg entries and convert to network byte order */
	for (i = 0; i < numentries; i++) {
		oscd->entries[i].offset = cpu_to_be64(sglist[i].offset);
		oscd->entries[i].len    = cpu_to_be64(sglist[i].len);
		*len += sglist[i].len;
	}

	or->cdb_cont.total_bytes += oscd_size;
	OSD_DEBUG("total_bytes=%d oscd_size=%d numentries=%d\n",
		  or->cdb_cont.total_bytes, oscd_size, numentries);
	return 0;
}

static int _osd_req_finalize_cdb_cont(struct osd_request *or, const u8 *cap_key)
{
	struct request_queue *req_q = osd_request_queue(or->osd_dev);
	struct bio *bio;
	struct osd_cdb_head *cdbh = osd_cdb_head(&or->cdb);
	struct osd_continuation_segment_header *cont_seg_hdr;

	if (!or->cdb_cont.total_bytes)
		return 0;

	cont_seg_hdr = or->cdb_cont.buff;
	cont_seg_hdr->format = CDB_CONTINUATION_FORMAT_V2;
	cont_seg_hdr->service_action = cdbh->varlen_cdb.service_action;

	/* create a bio for continuation segment */
	bio = bio_map_kern(req_q, or->cdb_cont.buff, or->cdb_cont.total_bytes,
			   GFP_KERNEL);
	if (IS_ERR(bio))
		return PTR_ERR(bio);

	bio->bi_rw |= REQ_WRITE;

	/* integrity check the continuation before the bio is linked
	 * with the other data segments since the continuation
	 * integrity is separate from the other data segments.
	 */
	osd_sec_sign_data(cont_seg_hdr->integrity_check, bio, cap_key);

	cdbh->v2.cdb_continuation_length = cpu_to_be32(or->cdb_cont.total_bytes);

	/* we can't use _req_append_segment, because we need to link in the
	 * continuation bio to the head of the bio list - the
	 * continuation segment (if it exists) is always the first segment in
	 * the out data buffer.
	 */
	bio->bi_next = or->out.bio;
	or->out.bio = bio;
	or->out.total_bytes += or->cdb_cont.total_bytes;

	return 0;
}

/* osd_req_write_sg: Takes a @bio that points to the data out buffer and an
 * @sglist that has the scatter gather entries. Scatter-gather enables a write
 * of multiple none-contiguous areas of an object, in a single call. The extents
 * may overlap and/or be in any order. The only constrain is that:
 *	total_bytes(sglist) >= total_bytes(bio)
 */
int osd_req_write_sg(struct osd_request *or,
	const struct osd_obj_id *obj, struct bio *bio,
	const struct osd_sg_entry *sglist, unsigned numentries)
{
	u64 len;
	int ret = _add_sg_continuation_descriptor(or, sglist, numentries, &len);

	if (ret)
		return ret;
	osd_req_write(or, obj, 0, bio, len);

	return 0;
}
EXPORT_SYMBOL(osd_req_write_sg);

/* osd_req_read_sg: Read multiple extents of an object into @bio
 * See osd_req_write_sg
 */
int osd_req_read_sg(struct osd_request *or,
	const struct osd_obj_id *obj, struct bio *bio,
	const struct osd_sg_entry *sglist, unsigned numentries)
{
	u64 len;
	u64 off;
	int ret;

	if (numentries > 1) {
		off = 0;
		ret = _add_sg_continuation_descriptor(or, sglist, numentries,
						      &len);
		if (ret)
			return ret;
	} else {
		/* Optimize the case of single segment, read_sg is a
		 * bidi operation.
		 */
		len = sglist->len;
		off = sglist->offset;
	}
	osd_req_read(or, obj, off, bio, len);

	return 0;
}
EXPORT_SYMBOL(osd_req_read_sg);

/* SG-list write/read Kern API
 *
 * osd_req_{write,read}_sg_kern takes an array of @buff pointers and an array
 * of sg_entries. @numentries indicates how many pointers and sg_entries there
 * are.  By requiring an array of buff pointers. This allows a caller to do a
 * single write/read and scatter into multiple buffers.
 * NOTE: Each buffer + len should not cross a page boundary.
 */
static struct bio *_create_sg_bios(struct osd_request *or,
	void **buff, const struct osd_sg_entry *sglist, unsigned numentries)
{
	struct request_queue *q = osd_request_queue(or->osd_dev);
	struct bio *bio;
	unsigned i;

	bio = bio_kmalloc(GFP_KERNEL, numentries);
	if (unlikely(!bio)) {
		OSD_DEBUG("Failed to allocate BIO size=%u\n", numentries);
		return ERR_PTR(-ENOMEM);
	}

	for (i = 0; i < numentries; i++) {
		unsigned offset = offset_in_page(buff[i]);
		struct page *page = virt_to_page(buff[i]);
		unsigned len = sglist[i].len;
		unsigned added_len;

		BUG_ON(offset + len > PAGE_SIZE);
		added_len = bio_add_pc_page(q, bio, page, len, offset);
		if (unlikely(len != added_len)) {
			OSD_DEBUG("bio_add_pc_page len(%d) != added_len(%d)\n",
				  len, added_len);
			bio_put(bio);
			return ERR_PTR(-ENOMEM);
		}
	}

	return bio;
}

int osd_req_write_sg_kern(struct osd_request *or,
	const struct osd_obj_id *obj, void **buff,
	const struct osd_sg_entry *sglist, unsigned numentries)
{
	struct bio *bio = _create_sg_bios(or, buff, sglist, numentries);
	if (IS_ERR(bio))
		return PTR_ERR(bio);

	bio->bi_rw |= REQ_WRITE;
	osd_req_write_sg(or, obj, bio, sglist, numentries);

	return 0;
}
EXPORT_SYMBOL(osd_req_write_sg_kern);

int osd_req_read_sg_kern(struct osd_request *or,
	const struct osd_obj_id *obj, void **buff,
	const struct osd_sg_entry *sglist, unsigned numentries)
{
	struct bio *bio = _create_sg_bios(or, buff, sglist, numentries);
	if (IS_ERR(bio))
		return PTR_ERR(bio);

	osd_req_read_sg(or, obj, bio, sglist, numentries);

	return 0;
}
EXPORT_SYMBOL(osd_req_read_sg_kern);



void osd_req_get_attributes(struct osd_request *or,
	const struct osd_obj_id *obj)
{
	_osd_req_encode_common(or, OSD_ACT_GET_ATTRIBUTES, obj, 0, 0);
}
EXPORT_SYMBOL(osd_req_get_attributes);

void osd_req_set_attributes(struct osd_request *or,
	const struct osd_obj_id *obj)
{
	_osd_req_encode_common(or, OSD_ACT_SET_ATTRIBUTES, obj, 0, 0);
}
EXPORT_SYMBOL(osd_req_set_attributes);

/*
 * Attributes List-mode
 */

int osd_req_add_set_attr_list(struct osd_request *or,
	const struct osd_attr *oa, unsigned nelem)
{
	unsigned total_bytes = or->set_attr.total_bytes;
	void *attr_last;
	int ret;

	if (or->attributes_mode &&
	    or->attributes_mode != OSD_CDB_GET_SET_ATTR_LISTS) {
		WARN_ON(1);
		return -EINVAL;
	}
	or->attributes_mode = OSD_CDB_GET_SET_ATTR_LISTS;

	if (!total_bytes) { /* first-time: allocate and put list header */
		total_bytes = _osd_req_sizeof_alist_header(or);
		ret = _alloc_set_attr_list(or, oa, nelem, total_bytes);
		if (ret)
			return ret;
		_osd_req_set_alist_type(or, or->set_attr.buff,
					OSD_ATTR_LIST_SET_RETRIEVE);
	}
	attr_last = or->set_attr.buff + total_bytes;

	for (; nelem; --nelem) {
		unsigned elem_size = _osd_req_alist_elem_size(or, oa->len);

		total_bytes += elem_size;
		if (unlikely(or->set_attr.alloc_size < total_bytes)) {
			or->set_attr.total_bytes = total_bytes - elem_size;
			ret = _alloc_set_attr_list(or, oa, nelem, total_bytes);
			if (ret)
				return ret;
			attr_last =
				or->set_attr.buff + or->set_attr.total_bytes;
		}

		_osd_req_alist_elem_encode(or, attr_last, oa);

		attr_last += elem_size;
		++oa;
	}

	or->set_attr.total_bytes = total_bytes;
	return 0;
}
EXPORT_SYMBOL(osd_req_add_set_attr_list);

static int _req_append_segment(struct osd_request *or,
	unsigned padding, struct _osd_req_data_segment *seg,
	struct _osd_req_data_segment *last_seg, struct _osd_io_info *io)
{
	void *pad_buff;
	int ret;

	if (padding) {
		/* check if we can just add it to last buffer */
		if (last_seg &&
		    (padding <= last_seg->alloc_size - last_seg->total_bytes))
			pad_buff = last_seg->buff + last_seg->total_bytes;
		else
			pad_buff = io->pad_buff;

		ret = blk_rq_map_kern(io->req->q, io->req, pad_buff, padding,
				       or->alloc_flags);
		if (ret)
			return ret;
		io->total_bytes += padding;
	}

	ret = blk_rq_map_kern(io->req->q, io->req, seg->buff, seg->total_bytes,
			       or->alloc_flags);
	if (ret)
		return ret;

	io->total_bytes += seg->total_bytes;
	OSD_DEBUG("padding=%d buff=%p total_bytes=%d\n", padding, seg->buff,
		  seg->total_bytes);
	return 0;
}

static int _osd_req_finalize_set_attr_list(struct osd_request *or)
{
	struct osd_cdb_head *cdbh = osd_cdb_head(&or->cdb);
	unsigned padding;
	int ret;

	if (!or->set_attr.total_bytes) {
		cdbh->attrs_list.set_attr_offset = OSD_OFFSET_UNUSED;
		return 0;
	}

	cdbh->attrs_list.set_attr_bytes = cpu_to_be32(or->set_attr.total_bytes);
	cdbh->attrs_list.set_attr_offset =
		osd_req_encode_offset(or, or->out.total_bytes, &padding);

	ret = _req_append_segment(or, padding, &or->set_attr,
				  or->out.last_seg, &or->out);
	if (ret)
		return ret;

	or->out.last_seg = &or->set_attr;
	return 0;
}

int osd_req_add_get_attr_list(struct osd_request *or,
	const struct osd_attr *oa, unsigned nelem)
{
	unsigned total_bytes = or->enc_get_attr.total_bytes;
	void *attr_last;
	int ret;

	if (or->attributes_mode &&
	    or->attributes_mode != OSD_CDB_GET_SET_ATTR_LISTS) {
		WARN_ON(1);
		return -EINVAL;
	}
	or->attributes_mode = OSD_CDB_GET_SET_ATTR_LISTS;

	/* first time calc data-in list header size */
	if (!or->get_attr.total_bytes)
		or->get_attr.total_bytes = _osd_req_sizeof_alist_header(or);

	/* calc data-out info */
	if (!total_bytes) { /* first-time: allocate and put list header */
		unsigned max_bytes;

		total_bytes = _osd_req_sizeof_alist_header(or);
		max_bytes = total_bytes +
			nelem * sizeof(struct osd_attributes_list_attrid);
		ret = _alloc_get_attr_desc(or, max_bytes);
		if (ret)
			return ret;

		_osd_req_set_alist_type(or, or->enc_get_attr.buff,
					OSD_ATTR_LIST_GET);
	}
	attr_last = or->enc_get_attr.buff + total_bytes;

	for (; nelem; --nelem) {
		struct osd_attributes_list_attrid *attrid;
		const unsigned cur_size = sizeof(*attrid);

		total_bytes += cur_size;
		if (unlikely(or->enc_get_attr.alloc_size < total_bytes)) {
			or->enc_get_attr.total_bytes = total_bytes - cur_size;
			ret = _alloc_get_attr_desc(or,
					total_bytes + nelem * sizeof(*attrid));
			if (ret)
				return ret;
			attr_last = or->enc_get_attr.buff +
				or->enc_get_attr.total_bytes;
		}

		attrid = attr_last;
		attrid->attr_page = cpu_to_be32(oa->attr_page);
		attrid->attr_id = cpu_to_be32(oa->attr_id);

		attr_last += cur_size;

		/* calc data-in size */
		or->get_attr.total_bytes +=
			_osd_req_alist_elem_size(or, oa->len);
		++oa;
	}

	or->enc_get_attr.total_bytes = total_bytes;

	OSD_DEBUG(
	       "get_attr.total_bytes=%u(%u) enc_get_attr.total_bytes=%u(%Zu)\n",
	       or->get_attr.total_bytes,
	       or->get_attr.total_bytes - _osd_req_sizeof_alist_header(or),
	       or->enc_get_attr.total_bytes,
	       (or->enc_get_attr.total_bytes - _osd_req_sizeof_alist_header(or))
			/ sizeof(struct osd_attributes_list_attrid));

	return 0;
}
EXPORT_SYMBOL(osd_req_add_get_attr_list);

static int _osd_req_finalize_get_attr_list(struct osd_request *or)
{
	struct osd_cdb_head *cdbh = osd_cdb_head(&or->cdb);
	unsigned out_padding;
	unsigned in_padding;
	int ret;

	if (!or->enc_get_attr.total_bytes) {
		cdbh->attrs_list.get_attr_desc_offset = OSD_OFFSET_UNUSED;
		cdbh->attrs_list.get_attr_offset = OSD_OFFSET_UNUSED;
		return 0;
	}

	ret = _alloc_get_attr_list(or);
	if (ret)
		return ret;

	/* The out-going buffer info update */
	OSD_DEBUG("out-going\n");
	cdbh->attrs_list.get_attr_desc_bytes =
		cpu_to_be32(or->enc_get_attr.total_bytes);

	cdbh->attrs_list.get_attr_desc_offset =
		osd_req_encode_offset(or, or->out.total_bytes, &out_padding);

	ret = _req_append_segment(or, out_padding, &or->enc_get_attr,
				  or->out.last_seg, &or->out);
	if (ret)
		return ret;
	or->out.last_seg = &or->enc_get_attr;

	/* The incoming buffer info update */
	OSD_DEBUG("in-coming\n");
	cdbh->attrs_list.get_attr_alloc_length =
		cpu_to_be32(or->get_attr.total_bytes);

	cdbh->attrs_list.get_attr_offset =
		osd_req_encode_offset(or, or->in.total_bytes, &in_padding);

	ret = _req_append_segment(or, in_padding, &or->get_attr, NULL,
				  &or->in);
	if (ret)
		return ret;
	or->in.last_seg = &or->get_attr;

	return 0;
}

int osd_req_decode_get_attr_list(struct osd_request *or,
	struct osd_attr *oa, int *nelem, void **iterator)
{
	unsigned cur_bytes, returned_bytes;
	int n;
	const unsigned sizeof_attr_list = _osd_req_sizeof_alist_header(or);
	void *cur_p;

	if (!_osd_req_is_alist_type(or, or->get_attr.buff,
				    OSD_ATTR_LIST_SET_RETRIEVE)) {
		oa->attr_page = 0;
		oa->attr_id = 0;
		oa->val_ptr = NULL;
		oa->len = 0;
		*iterator = NULL;
		return 0;
	}

	if (*iterator) {
		BUG_ON((*iterator < or->get_attr.buff) ||
		     (or->get_attr.buff + or->get_attr.alloc_size < *iterator));
		cur_p = *iterator;
		cur_bytes = (*iterator - or->get_attr.buff) - sizeof_attr_list;
		returned_bytes = or->get_attr.total_bytes;
	} else { /* first time decode the list header */
		cur_bytes = sizeof_attr_list;
		returned_bytes = _osd_req_alist_size(or, or->get_attr.buff) +
					sizeof_attr_list;

		cur_p = or->get_attr.buff + sizeof_attr_list;

		if (returned_bytes > or->get_attr.alloc_size) {
			OSD_DEBUG("target report: space was not big enough! "
				  "Allocate=%u Needed=%u\n",
				  or->get_attr.alloc_size,
				  returned_bytes + sizeof_attr_list);

			returned_bytes =
				or->get_attr.alloc_size - sizeof_attr_list;
		}
		or->get_attr.total_bytes = returned_bytes;
	}

	for (n = 0; (n < *nelem) && (cur_bytes < returned_bytes); ++n) {
		int inc = _osd_req_alist_elem_decode(or, cur_p, oa,
						 returned_bytes - cur_bytes);

		if (inc < 0) {
			OSD_ERR("BAD FOOD from target. list not valid!"
				"c=%d r=%d n=%d\n",
				cur_bytes, returned_bytes, n);
			oa->val_ptr = NULL;
			cur_bytes = returned_bytes; /* break the caller loop */
			break;
		}

		cur_bytes += inc;
		cur_p += inc;
		++oa;
	}

	*iterator = (returned_bytes - cur_bytes) ? cur_p : NULL;
	*nelem = n;
	return returned_bytes - cur_bytes;
}
EXPORT_SYMBOL(osd_req_decode_get_attr_list);

/*
 * Attributes Page-mode
 */

int osd_req_add_get_attr_page(struct osd_request *or,
	u32 page_id, void *attar_page, unsigned max_page_len,
	const struct osd_attr *set_one_attr)
{
	struct osd_cdb_head *cdbh = osd_cdb_head(&or->cdb);

	if (or->attributes_mode &&
	    or->attributes_mode != OSD_CDB_GET_ATTR_PAGE_SET_ONE) {
		WARN_ON(1);
		return -EINVAL;
	}
	or->attributes_mode = OSD_CDB_GET_ATTR_PAGE_SET_ONE;

	or->get_attr.buff = attar_page;
	or->get_attr.total_bytes = max_page_len;

	cdbh->attrs_page.get_attr_page = cpu_to_be32(page_id);
	cdbh->attrs_page.get_attr_alloc_length = cpu_to_be32(max_page_len);

	if (!set_one_attr || !set_one_attr->attr_page)
		return 0; /* The set is optional */

	or->set_attr.buff = set_one_attr->val_ptr;
	or->set_attr.total_bytes = set_one_attr->len;

	cdbh->attrs_page.set_attr_page = cpu_to_be32(set_one_attr->attr_page);
	cdbh->attrs_page.set_attr_id = cpu_to_be32(set_one_attr->attr_id);
	cdbh->attrs_page.set_attr_length = cpu_to_be32(set_one_attr->len);
	return 0;
}
EXPORT_SYMBOL(osd_req_add_get_attr_page);

static int _osd_req_finalize_attr_page(struct osd_request *or)
{
	struct osd_cdb_head *cdbh = osd_cdb_head(&or->cdb);
	unsigned in_padding, out_padding;
	int ret;

	/* returned page */
	cdbh->attrs_page.get_attr_offset =
		osd_req_encode_offset(or, or->in.total_bytes, &in_padding);

	ret = _req_append_segment(or, in_padding, &or->get_attr, NULL,
				  &or->in);
	if (ret)
		return ret;

	if (or->set_attr.total_bytes == 0)
		return 0;

	/* set one value */
	cdbh->attrs_page.set_attr_offset =
		osd_req_encode_offset(or, or->out.total_bytes, &out_padding);

	ret = _req_append_segment(or, out_padding, &or->set_attr, NULL,
				  &or->out);
	return ret;
}

static inline void osd_sec_parms_set_out_offset(bool is_v1,
	struct osd_security_parameters *sec_parms, osd_cdb_offset offset)
{
	if (is_v1)
		sec_parms->v1.data_out_integrity_check_offset = offset;
	else
		sec_parms->v2.data_out_integrity_check_offset = offset;
}

static inline void osd_sec_parms_set_in_offset(bool is_v1,
	struct osd_security_parameters *sec_parms, osd_cdb_offset offset)
{
	if (is_v1)
		sec_parms->v1.data_in_integrity_check_offset = offset;
	else
		sec_parms->v2.data_in_integrity_check_offset = offset;
}

static int _osd_req_finalize_data_integrity(struct osd_request *or,
	bool has_in, bool has_out, struct bio *out_data_bio, u64 out_data_bytes,
	const u8 *cap_key)
{
	struct osd_security_parameters *sec_parms = _osd_req_sec_params(or);
	int ret;

	if (!osd_is_sec_alldata(sec_parms))
		return 0;

	if (has_out) {
		struct _osd_req_data_segment seg = {
			.buff = &or->out_data_integ,
			.total_bytes = sizeof(or->out_data_integ),
		};
		unsigned pad;

		or->out_data_integ.data_bytes = cpu_to_be64(out_data_bytes);
		or->out_data_integ.set_attributes_bytes = cpu_to_be64(
			or->set_attr.total_bytes);
		or->out_data_integ.get_attributes_bytes = cpu_to_be64(
			or->enc_get_attr.total_bytes);

		osd_sec_parms_set_out_offset(osd_req_is_ver1(or), sec_parms,
			osd_req_encode_offset(or, or->out.total_bytes, &pad));

		ret = _req_append_segment(or, pad, &seg, or->out.last_seg,
					  &or->out);
		if (ret)
			return ret;
		or->out.last_seg = NULL;

		/* they are now all chained to request sign them all together */
		osd_sec_sign_data(&or->out_data_integ, out_data_bio,
				  cap_key);
	}

	if (has_in) {
		struct _osd_req_data_segment seg = {
			.buff = &or->in_data_integ,
			.total_bytes = sizeof(or->in_data_integ),
		};
		unsigned pad;

		osd_sec_parms_set_in_offset(osd_req_is_ver1(or), sec_parms,
			osd_req_encode_offset(or, or->in.total_bytes, &pad));

		ret = _req_append_segment(or, pad, &seg, or->in.last_seg,
					  &or->in);
		if (ret)
			return ret;

		or->in.last_seg = NULL;
	}

	return 0;
}

/*
 * osd_finalize_request and helpers
 */
static struct request *_make_request(struct request_queue *q, bool has_write,
			      struct _osd_io_info *oii, gfp_t flags)
{
	if (oii->bio)
		return blk_make_request(q, oii->bio, flags);
	else {
		struct request *req;

		req = blk_get_request(q, has_write ? WRITE : READ, flags);
		if (unlikely(!req))
			return ERR_PTR(-ENOMEM);

		return req;
	}
}

static int _init_blk_request(struct osd_request *or,
	bool has_in, bool has_out)
{
	gfp_t flags = or->alloc_flags;
	struct scsi_device *scsi_device = or->osd_dev->scsi_device;
	struct request_queue *q = scsi_device->request_queue;
	struct request *req;
	int ret;

	req = _make_request(q, has_out, has_out ? &or->out : &or->in, flags);
	if (IS_ERR(req)) {
		ret = PTR_ERR(req);
		goto out;
	}

	or->request = req;
	req->cmd_type = REQ_TYPE_BLOCK_PC;
	req->cmd_flags |= REQ_QUIET;

	req->timeout = or->timeout;
	req->retries = or->retries;
	req->sense = or->sense;
	req->sense_len = 0;

	if (has_out) {
		or->out.req = req;
		if (has_in) {
			/* allocate bidi request */
			req = _make_request(q, false, &or->in, flags);
			if (IS_ERR(req)) {
				OSD_DEBUG("blk_get_request for bidi failed\n");
				ret = PTR_ERR(req);
				goto out;
			}
			req->cmd_type = REQ_TYPE_BLOCK_PC;
			or->in.req = or->request->next_rq = req;
		}
	} else if (has_in)
		or->in.req = req;

	ret = 0;
out:
	OSD_DEBUG("or=%p has_in=%d has_out=%d => %d, %p\n",
			or, has_in, has_out, ret, or->request);
	return ret;
}

int osd_finalize_request(struct osd_request *or,
	u8 options, const void *cap, const u8 *cap_key)
{
	struct osd_cdb_head *cdbh = osd_cdb_head(&or->cdb);
	bool has_in, has_out;
	 /* Save for data_integrity without the cdb_continuation */
	struct bio *out_data_bio = or->out.bio;
	u64 out_data_bytes = or->out.total_bytes;
	int ret;

	if (options & OSD_REQ_FUA)
		cdbh->options |= OSD_CDB_FUA;

	if (options & OSD_REQ_DPO)
		cdbh->options |= OSD_CDB_DPO;

	if (options & OSD_REQ_BYPASS_TIMESTAMPS)
		cdbh->timestamp_control = OSD_CDB_BYPASS_TIMESTAMPS;

	osd_set_caps(&or->cdb, cap);

	has_in = or->in.bio || or->get_attr.total_bytes;
	has_out = or->out.bio || or->cdb_cont.total_bytes ||
		or->set_attr.total_bytes || or->enc_get_attr.total_bytes;

	ret = _osd_req_finalize_cdb_cont(or, cap_key);
	if (ret) {
		OSD_DEBUG("_osd_req_finalize_cdb_cont failed\n");
		return ret;
	}
	ret = _init_blk_request(or, has_in, has_out);
	if (ret) {
		OSD_DEBUG("_init_blk_request failed\n");
		return ret;
	}

	or->out.pad_buff = sg_out_pad_buffer;
	or->in.pad_buff = sg_in_pad_buffer;

	if (!or->attributes_mode)
		or->attributes_mode = OSD_CDB_GET_SET_ATTR_LISTS;
	cdbh->command_specific_options |= or->attributes_mode;
	if (or->attributes_mode == OSD_CDB_GET_ATTR_PAGE_SET_ONE) {
		ret = _osd_req_finalize_attr_page(or);
		if (ret) {
			OSD_DEBUG("_osd_req_finalize_attr_page failed\n");
			return ret;
		}
	} else {
		/* TODO: I think that for the GET_ATTR command these 2 should
		 * be reversed to keep them in execution order (for embeded
		 * targets with low memory footprint)
		 */
		ret = _osd_req_finalize_set_attr_list(or);
		if (ret) {
			OSD_DEBUG("_osd_req_finalize_set_attr_list failed\n");
			return ret;
		}

		ret = _osd_req_finalize_get_attr_list(or);
		if (ret) {
			OSD_DEBUG("_osd_req_finalize_get_attr_list failed\n");
			return ret;
		}
	}

	ret = _osd_req_finalize_data_integrity(or, has_in, has_out,
					       out_data_bio, out_data_bytes,
					       cap_key);
	if (ret)
		return ret;

	osd_sec_sign_cdb(&or->cdb, cap_key);

	or->request->cmd = or->cdb.buff;
	or->request->cmd_len = _osd_req_cdb_len(or);

	return 0;
}
EXPORT_SYMBOL(osd_finalize_request);

static bool _is_osd_security_code(int code)
{
	return	(code == osd_security_audit_value_frozen) ||
		(code == osd_security_working_key_frozen) ||
		(code == osd_nonce_not_unique) ||
		(code == osd_nonce_timestamp_out_of_range) ||
		(code == osd_invalid_dataout_buffer_integrity_check_value);
}

#define OSD_SENSE_PRINT1(fmt, a...) \
	do { \
		if (__cur_sense_need_output) \
			OSD_ERR(fmt, ##a); \
	} while (0)

#define OSD_SENSE_PRINT2(fmt, a...) OSD_SENSE_PRINT1("    " fmt, ##a)

int osd_req_decode_sense_full(struct osd_request *or,
	struct osd_sense_info *osi, bool silent,
	struct osd_obj_id *bad_obj_list __unused, int max_obj __unused,
	struct osd_attr *bad_attr_list, int max_attr)
{
	int sense_len, original_sense_len;
	struct osd_sense_info local_osi;
	struct scsi_sense_descriptor_based *ssdb;
	void *cur_descriptor;
#if (CONFIG_SCSI_OSD_DPRINT_SENSE == 0)
	const bool __cur_sense_need_output = false;
#else
	bool __cur_sense_need_output = !silent;
#endif
	int ret;

	if (likely(!or->req_errors))
		return 0;

	osi = osi ? : &local_osi;
	memset(osi, 0, sizeof(*osi));

	ssdb = (typeof(ssdb))or->sense;
	sense_len = or->sense_len;
	if ((sense_len < (int)sizeof(*ssdb) || !ssdb->sense_key)) {
		OSD_ERR("Block-layer returned error(0x%x) but "
			"sense_len(%u) || key(%d) is empty\n",
			or->req_errors, sense_len, ssdb->sense_key);
		goto analyze;
	}

	if ((ssdb->response_code != 0x72) && (ssdb->response_code != 0x73)) {
		OSD_ERR("Unrecognized scsi sense: rcode=%x length=%d\n",
			ssdb->response_code, sense_len);
		goto analyze;
	}

	osi->key = ssdb->sense_key;
	osi->additional_code = be16_to_cpu(ssdb->additional_sense_code);
	original_sense_len = ssdb->additional_sense_length + 8;

#if (CONFIG_SCSI_OSD_DPRINT_SENSE == 1)
	if (__cur_sense_need_output)
		__cur_sense_need_output = (osi->key > scsi_sk_recovered_error);
#endif
	OSD_SENSE_PRINT1("Main Sense information key=0x%x length(%d, %d) "
			"additional_code=0x%x async_error=%d errors=0x%x\n",
			osi->key, original_sense_len, sense_len,
			osi->additional_code, or->async_error,
			or->req_errors);

	if (original_sense_len < sense_len)
		sense_len = original_sense_len;

	cur_descriptor = ssdb->ssd;
	sense_len -= sizeof(*ssdb);
	while (sense_len > 0) {
		struct scsi_sense_descriptor *ssd = cur_descriptor;
		int cur_len = ssd->additional_length + 2;

		sense_len -= cur_len;

		if (sense_len < 0)
			break; /* sense was truncated */

		switch (ssd->descriptor_type) {
		case scsi_sense_information:
		case scsi_sense_command_specific_information:
		{
			struct scsi_sense_command_specific_data_descriptor
				*sscd = cur_descriptor;

			osi->command_info =
				get_unaligned_be64(&sscd->information) ;
			OSD_SENSE_PRINT2(
				"command_specific_information 0x%llx \n",
				_LLU(osi->command_info));
			break;
		}
		case scsi_sense_key_specific:
		{
			struct scsi_sense_key_specific_data_descriptor
				*ssks = cur_descriptor;

			osi->sense_info = get_unaligned_be16(&ssks->value);
			OSD_SENSE_PRINT2(
				"sense_key_specific_information %u"
				"sksv_cd_bpv_bp (0x%x)\n",
				osi->sense_info, ssks->sksv_cd_bpv_bp);
			break;
		}
		case osd_sense_object_identification:
		{ /*FIXME: Keep first not last, Store in array*/
			struct osd_sense_identification_data_descriptor
				*osidd = cur_descriptor;

			osi->not_initiated_command_functions =
				le32_to_cpu(osidd->not_initiated_functions);
			osi->completed_command_functions =
				le32_to_cpu(osidd->completed_functions);
			osi->obj.partition = be64_to_cpu(osidd->partition_id);
			osi->obj.id = be64_to_cpu(osidd->object_id);
			OSD_SENSE_PRINT2(
				"object_identification pid=0x%llx oid=0x%llx\n",
				_LLU(osi->obj.partition), _LLU(osi->obj.id));
			OSD_SENSE_PRINT2(
				"not_initiated_bits(%x) "
				"completed_command_bits(%x)\n",
				osi->not_initiated_command_functions,
				osi->completed_command_functions);
			break;
		}
		case osd_sense_response_integrity_check:
		{
			struct osd_sense_response_integrity_check_descriptor
				*osricd = cur_descriptor;
			const unsigned len =
					  sizeof(osricd->integrity_check_value);
			char key_dump[len*4 + 2]; /* 2nibbles+space+ASCII */

			hex_dump_to_buffer(osricd->integrity_check_value, len,
				       32, 1, key_dump, sizeof(key_dump), true);
			OSD_SENSE_PRINT2("response_integrity [%s]\n", key_dump);
		}
		case osd_sense_attribute_identification:
		{
			struct osd_sense_attributes_data_descriptor
				*osadd = cur_descriptor;
			unsigned len = min(cur_len, sense_len);
			struct osd_sense_attr *pattr = osadd->sense_attrs;

			while (len >= sizeof(*pattr)) {
				u32 attr_page = be32_to_cpu(pattr->attr_page);
				u32 attr_id = be32_to_cpu(pattr->attr_id);

				if (!osi->attr.attr_page) {
					osi->attr.attr_page = attr_page;
					osi->attr.attr_id = attr_id;
				}

				if (bad_attr_list && max_attr) {
					bad_attr_list->attr_page = attr_page;
					bad_attr_list->attr_id = attr_id;
					bad_attr_list++;
					max_attr--;
				}

				len -= sizeof(*pattr);
				OSD_SENSE_PRINT2(
					"osd_sense_attribute_identification"
					"attr_page=0x%x attr_id=0x%x\n",
					attr_page, attr_id);
			}
		}
		/*These are not legal for OSD*/
		case scsi_sense_field_replaceable_unit:
			OSD_SENSE_PRINT2("scsi_sense_field_replaceable_unit\n");
			break;
		case scsi_sense_stream_commands:
			OSD_SENSE_PRINT2("scsi_sense_stream_commands\n");
			break;
		case scsi_sense_block_commands:
			OSD_SENSE_PRINT2("scsi_sense_block_commands\n");
			break;
		case scsi_sense_ata_return:
			OSD_SENSE_PRINT2("scsi_sense_ata_return\n");
			break;
		default:
			if (ssd->descriptor_type <= scsi_sense_Reserved_last)
				OSD_SENSE_PRINT2(
					"scsi_sense Reserved descriptor (0x%x)",
					ssd->descriptor_type);
			else
				OSD_SENSE_PRINT2(
					"scsi_sense Vendor descriptor (0x%x)",
					ssd->descriptor_type);
		}

		cur_descriptor += cur_len;
	}

analyze:
	if (!osi->key) {
		/* scsi sense is Empty, the request was never issued to target
		 * linux return code might tell us what happened.
		 */
		if (or->async_error == -ENOMEM)
			osi->osd_err_pri = OSD_ERR_PRI_RESOURCE;
		else
			osi->osd_err_pri = OSD_ERR_PRI_UNREACHABLE;
		ret = or->async_error;
	} else if (osi->key <= scsi_sk_recovered_error) {
		osi->osd_err_pri = 0;
		ret = 0;
	} else if (osi->additional_code == scsi_invalid_field_in_cdb) {
		if (osi->cdb_field_offset == OSD_CFO_STARTING_BYTE) {
			osi->osd_err_pri = OSD_ERR_PRI_CLEAR_PAGES;
			ret = -EFAULT; /* caller should recover from this */
		} else if (osi->cdb_field_offset == OSD_CFO_OBJECT_ID) {
			osi->osd_err_pri = OSD_ERR_PRI_NOT_FOUND;
			ret = -ENOENT;
		} else if (osi->cdb_field_offset == OSD_CFO_PERMISSIONS) {
			osi->osd_err_pri = OSD_ERR_PRI_NO_ACCESS;
			ret = -EACCES;
		} else {
			osi->osd_err_pri = OSD_ERR_PRI_BAD_CRED;
			ret = -EINVAL;
		}
	} else if (osi->additional_code == osd_quota_error) {
		osi->osd_err_pri = OSD_ERR_PRI_NO_SPACE;
		ret = -ENOSPC;
	} else if (_is_osd_security_code(osi->additional_code)) {
		osi->osd_err_pri = OSD_ERR_PRI_BAD_CRED;
		ret = -EINVAL;
	} else {
		osi->osd_err_pri = OSD_ERR_PRI_EIO;
		ret = -EIO;
	}

	if (!or->out.residual)
		or->out.residual = or->out.total_bytes;
	if (!or->in.residual)
		or->in.residual = or->in.total_bytes;

	return ret;
}
EXPORT_SYMBOL(osd_req_decode_sense_full);

/*
 * Implementation of osd_sec.h API
 * TODO: Move to a separate osd_sec.c file at a later stage.
 */

enum { OSD_SEC_CAP_V1_ALL_CAPS =
	OSD_SEC_CAP_APPEND | OSD_SEC_CAP_OBJ_MGMT | OSD_SEC_CAP_REMOVE   |
	OSD_SEC_CAP_CREATE | OSD_SEC_CAP_SET_ATTR | OSD_SEC_CAP_GET_ATTR |
	OSD_SEC_CAP_WRITE  | OSD_SEC_CAP_READ     | OSD_SEC_CAP_POL_SEC  |
	OSD_SEC_CAP_GLOBAL | OSD_SEC_CAP_DEV_MGMT
};

enum { OSD_SEC_CAP_V2_ALL_CAPS =
	OSD_SEC_CAP_V1_ALL_CAPS | OSD_SEC_CAP_QUERY | OSD_SEC_CAP_M_OBJECT
};

void osd_sec_init_nosec_doall_caps(void *caps,
	const struct osd_obj_id *obj, bool is_collection, const bool is_v1)
{
	struct osd_capability *cap = caps;
	u8 type;
	u8 descriptor_type;

	if (likely(obj->id)) {
		if (unlikely(is_collection)) {
			type = OSD_SEC_OBJ_COLLECTION;
			descriptor_type = is_v1 ? OSD_SEC_OBJ_DESC_OBJ :
						  OSD_SEC_OBJ_DESC_COL;
		} else {
			type = OSD_SEC_OBJ_USER;
			descriptor_type = OSD_SEC_OBJ_DESC_OBJ;
		}
		WARN_ON(!obj->partition);
	} else {
		type = obj->partition ? OSD_SEC_OBJ_PARTITION :
					OSD_SEC_OBJ_ROOT;
		descriptor_type = OSD_SEC_OBJ_DESC_PAR;
	}

	memset(cap, 0, sizeof(*cap));

	cap->h.format = OSD_SEC_CAP_FORMAT_VER1;
	cap->h.integrity_algorithm__key_version = 0; /* MAKE_BYTE(0, 0); */
	cap->h.security_method = OSD_SEC_NOSEC;
/*	cap->expiration_time;
	cap->AUDIT[30-10];
	cap->discriminator[42-30];
	cap->object_created_time; */
	cap->h.object_type = type;
	osd_sec_set_caps(&cap->h, OSD_SEC_CAP_V1_ALL_CAPS);
	cap->h.object_descriptor_type = descriptor_type;
	cap->od.obj_desc.policy_access_tag = 0;
	cap->od.obj_desc.allowed_partition_id = cpu_to_be64(obj->partition);
	cap->od.obj_desc.allowed_object_id = cpu_to_be64(obj->id);
}
EXPORT_SYMBOL(osd_sec_init_nosec_doall_caps);

/* FIXME: Extract version from caps pointer.
 *        Also Pete's target only supports caps from OSDv1 for now
 */
void osd_set_caps(struct osd_cdb *cdb, const void *caps)
{
	bool is_ver1 = true;
	/* NOTE: They start at same address */
	memcpy(&cdb->v1.caps, caps, is_ver1 ? OSDv1_CAP_LEN : OSD_CAP_LEN);
}

bool osd_is_sec_alldata(struct osd_security_parameters *sec_parms __unused)
{
	return false;
}

void osd_sec_sign_cdb(struct osd_cdb *ocdb __unused, const u8 *cap_key __unused)
{
}

void osd_sec_sign_data(void *data_integ __unused,
		       struct bio *bio __unused, const u8 *cap_key __unused)
{
}

/*
 * Declared in osd_protocol.h
 * 4.12.5 Data-In and Data-Out buffer offsets
 * byte offset = mantissa * (2^(exponent+8))
 * Returns the smallest allowed encoded offset that contains given @offset
 * The actual encoded offset returned is @offset + *@padding.
 */
osd_cdb_offset __osd_encode_offset(
	u64 offset, unsigned *padding, int min_shift, int max_shift)
{
	u64 try_offset = -1, mod, align;
	osd_cdb_offset be32_offset;
	int shift;

	*padding = 0;
	if (!offset)
		return 0;

	for (shift = min_shift; shift < max_shift; ++shift) {
		try_offset = offset >> shift;
		if (try_offset < (1 << OSD_OFFSET_MAX_BITS))
			break;
	}

	BUG_ON(shift == max_shift);

	align = 1 << shift;
	mod = offset & (align - 1);
	if (mod) {
		*padding = align - mod;
		try_offset += 1;
	}

	try_offset |= ((shift - 8) & 0xf) << 28;
	be32_offset = cpu_to_be32((u32)try_offset);

	OSD_DEBUG("offset=%llu mantissa=%llu exp=%d encoded=%x pad=%d\n",
		 _LLU(offset), _LLU(try_offset & 0x0FFFFFFF), shift,
		 be32_offset, *padding);
	return be32_offset;
}
OpenPOWER on IntegriCloud