Free Electrons

Embedded Linux Experts

   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
/*
 * 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 <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_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;
	int ret = _add_sg_continuation_descriptor(or, sglist, numentries, &len);

	if (ret)
		return ret;
	osd_req_read(or, obj, 0, 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("Faild 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;
}