aboutsummaryrefslogtreecommitdiffstats
path: root/fs/cifs/smb2pdu.c
blob: 64d5a36a190193007157e7fb8d3a7e0960e13e25 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
4977
4978
4979
4980
4981
4982
4983
4984
4985
4986
4987
4988
4989
4990
4991
4992
4993
4994
4995
4996
4997
4998
4999
5000
5001
5002
5003
5004
5005
5006
5007
5008
5009
5010
5011
5012
5013
5014
5015
5016
5017
5018
5019
5020
5021
5022
5023
5024
5025
5026
5027
5028
5029
5030
5031
5032
5033
5034
5035
5036
5037
5038
5039
5040
5041
5042
5043
5044
5045
5046
5047
5048
5049
5050
5051
5052
5053
5054
5055
5056
5057
5058
5059
5060
5061
5062
5063
5064
/*
 *   fs/cifs/smb2pdu.c
 *
 *   Copyright (C) International Business Machines  Corp., 2009, 2013
 *                 Etersoft, 2012
 *   Author(s): Steve French (sfrench@us.ibm.com)
 *              Pavel Shilovsky (pshilovsky@samba.org) 2012
 *
 *   Contains the routines for constructing the SMB2 PDUs themselves
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published
 *   by the Free Software Foundation; either version 2.1 of the License, or
 *   (at your option) any later version.
 *
 *   This library is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

 /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
 /* Note that there are handle based routines which must be		      */
 /* treated slightly differently for reconnection purposes since we never     */
 /* want to reuse a stale file handle and only the caller knows the file info */

#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/vfs.h>
#include <linux/task_io_accounting_ops.h>
#include <linux/uaccess.h>
#include <linux/uuid.h>
#include <linux/pagemap.h>
#include <linux/xattr.h>
#include "smb2pdu.h"
#include "cifsglob.h"
#include "cifsacl.h"
#include "cifsproto.h"
#include "smb2proto.h"
#include "cifs_unicode.h"
#include "cifs_debug.h"
#include "ntlmssp.h"
#include "smb2status.h"
#include "smb2glob.h"
#include "cifspdu.h"
#include "cifs_spnego.h"
#include "smbdirect.h"
#include "trace.h"
#ifdef CONFIG_CIFS_DFS_UPCALL
#include "dfs_cache.h"
#endif

/*
 *  The following table defines the expected "StructureSize" of SMB2 requests
 *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
 *
 *  Note that commands are defined in smb2pdu.h in le16 but the array below is
 *  indexed by command in host byte order.
 */
static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
	/* SMB2_NEGOTIATE */ 36,
	/* SMB2_SESSION_SETUP */ 25,
	/* SMB2_LOGOFF */ 4,
	/* SMB2_TREE_CONNECT */	9,
	/* SMB2_TREE_DISCONNECT */ 4,
	/* SMB2_CREATE */ 57,
	/* SMB2_CLOSE */ 24,
	/* SMB2_FLUSH */ 24,
	/* SMB2_READ */	49,
	/* SMB2_WRITE */ 49,
	/* SMB2_LOCK */	48,
	/* SMB2_IOCTL */ 57,
	/* SMB2_CANCEL */ 4,
	/* SMB2_ECHO */ 4,
	/* SMB2_QUERY_DIRECTORY */ 33,
	/* SMB2_CHANGE_NOTIFY */ 32,
	/* SMB2_QUERY_INFO */ 41,
	/* SMB2_SET_INFO */ 33,
	/* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
};

int smb3_encryption_required(const struct cifs_tcon *tcon)
{
	if (!tcon)
		return 0;
	if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
	    (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
		return 1;
	if (tcon->seal &&
	    (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
		return 1;
	return 0;
}

static void
smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
		  const struct cifs_tcon *tcon)
{
	shdr->ProtocolId = SMB2_PROTO_NUMBER;
	shdr->StructureSize = cpu_to_le16(64);
	shdr->Command = smb2_cmd;
	if (tcon && tcon->ses && tcon->ses->server) {
		struct TCP_Server_Info *server = tcon->ses->server;

		spin_lock(&server->req_lock);
		/* Request up to 10 credits but don't go over the limit. */
		if (server->credits >= server->max_credits)
			shdr->CreditRequest = cpu_to_le16(0);
		else
			shdr->CreditRequest = cpu_to_le16(
				min_t(int, server->max_credits -
						server->credits, 10));
		spin_unlock(&server->req_lock);
	} else {
		shdr->CreditRequest = cpu_to_le16(2);
	}
	shdr->ProcessId = cpu_to_le32((__u16)current->tgid);

	if (!tcon)
		goto out;

	/* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
	/* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
	if ((tcon->ses) && (tcon->ses->server) &&
	    (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
		shdr->CreditCharge = cpu_to_le16(1);
	/* else CreditCharge MBZ */

	shdr->TreeId = tcon->tid;
	/* Uid is not converted */
	if (tcon->ses)
		shdr->SessionId = tcon->ses->Suid;

	/*
	 * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
	 * to pass the path on the Open SMB prefixed by \\server\share.
	 * Not sure when we would need to do the augmented path (if ever) and
	 * setting this flag breaks the SMB2 open operation since it is
	 * illegal to send an empty path name (without \\server\share prefix)
	 * when the DFS flag is set in the SMB open header. We could
	 * consider setting the flag on all operations other than open
	 * but it is safer to net set it for now.
	 */
/*	if (tcon->share_flags & SHI1005_FLAGS_DFS)
		shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */

	if (tcon->ses && tcon->ses->server && tcon->ses->server->sign &&
	    !smb3_encryption_required(tcon))
		shdr->Flags |= SMB2_FLAGS_SIGNED;
out:
	return;
}

#ifdef CONFIG_CIFS_DFS_UPCALL
static int __smb2_reconnect(const struct nls_table *nlsc,
			    struct cifs_tcon *tcon)
{
	int rc;
	struct dfs_cache_tgt_list tl;
	struct dfs_cache_tgt_iterator *it = NULL;
	char *tree;
	const char *tcp_host;
	size_t tcp_host_len;
	const char *dfs_host;
	size_t dfs_host_len;

	tree = kzalloc(MAX_TREE_SIZE, GFP_KERNEL);
	if (!tree)
		return -ENOMEM;

	if (tcon->ipc) {
		scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$",
			  tcon->ses->server->hostname);
		rc = SMB2_tcon(0, tcon->ses, tree, tcon, nlsc);
		goto out;
	}

	if (!tcon->dfs_path) {
		rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nlsc);
		goto out;
	}

	rc = dfs_cache_noreq_find(tcon->dfs_path + 1, NULL, &tl);
	if (rc)
		goto out;

	extract_unc_hostname(tcon->ses->server->hostname, &tcp_host,
			     &tcp_host_len);

	for (it = dfs_cache_get_tgt_iterator(&tl); it;
	     it = dfs_cache_get_next_tgt(&tl, it)) {
		const char *tgt = dfs_cache_get_tgt_name(it);

		extract_unc_hostname(tgt, &dfs_host, &dfs_host_len);

		if (dfs_host_len != tcp_host_len
		    || strncasecmp(dfs_host, tcp_host, dfs_host_len) != 0) {
			cifs_dbg(FYI, "%s: skipping %.*s, doesn't match %.*s",
				 __func__,
				 (int)dfs_host_len, dfs_host,
				 (int)tcp_host_len, tcp_host);
			continue;
		}

		scnprintf(tree, MAX_TREE_SIZE, "\\%s", tgt);

		rc = SMB2_tcon(0, tcon->ses, tree, tcon, nlsc);
		if (!rc)
			break;
		if (rc == -EREMOTE)
			break;
	}

	if (!rc) {
		if (it)
			rc = dfs_cache_noreq_update_tgthint(tcon->dfs_path + 1,
							    it);
		else
			rc = -ENOENT;
	}
	dfs_cache_free_tgts(&tl);
out:
	kfree(tree);
	return rc;
}
#else
static inline int __smb2_reconnect(const struct nls_table *nlsc,
				   struct cifs_tcon *tcon)
{
	return SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nlsc);
}
#endif

static int
smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
{
	int rc;
	struct nls_table *nls_codepage;
	struct cifs_ses *ses;
	struct TCP_Server_Info *server;
	int retries;

	/*
	 * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
	 * check for tcp and smb session status done differently
	 * for those three - in the calling routine.
	 */
	if (tcon == NULL)
		return 0;

	if (smb2_command == SMB2_TREE_CONNECT)
		return 0;

	if (tcon->tidStatus == CifsExiting) {
		/*
		 * only tree disconnect, open, and write,
		 * (and ulogoff which does not have tcon)
		 * are allowed as we start force umount.
		 */
		if ((smb2_command != SMB2_WRITE) &&
		   (smb2_command != SMB2_CREATE) &&
		   (smb2_command != SMB2_TREE_DISCONNECT)) {
			cifs_dbg(FYI, "can not send cmd %d while umounting\n",
				 smb2_command);
			return -ENODEV;
		}
	}
	if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
	    (!tcon->ses->server))
		return -EIO;

	ses = tcon->ses;
	server = ses->server;

	retries = server->nr_targets;

	/*
	 * Give demultiplex thread up to 10 seconds to each target available for
	 * reconnect -- should be greater than cifs socket timeout which is 7
	 * seconds.
	 */
	while (server->tcpStatus == CifsNeedReconnect) {
		/*
		 * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
		 * here since they are implicitly done when session drops.
		 */
		switch (smb2_command) {
		/*
		 * BB Should we keep oplock break and add flush to exceptions?
		 */
		case SMB2_TREE_DISCONNECT:
		case SMB2_CANCEL:
		case SMB2_CLOSE:
		case SMB2_OPLOCK_BREAK:
			return -EAGAIN;
		}

		rc = wait_event_interruptible_timeout(server->response_q,
						      (server->tcpStatus != CifsNeedReconnect),
						      10 * HZ);
		if (rc < 0) {
			cifs_dbg(FYI, "%s: aborting reconnect due to a received"
				 " signal by the process\n", __func__);
			return -ERESTARTSYS;
		}

		/* are we still trying to reconnect? */
		if (server->tcpStatus != CifsNeedReconnect)
			break;

		if (--retries)
			continue;

		/*
		 * on "soft" mounts we wait once. Hard mounts keep
		 * retrying until process is killed or server comes
		 * back on-line
		 */
		if (!tcon->retry) {
			cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
			return -EHOSTDOWN;
		}
		retries = server->nr_targets;
	}

	if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
		return 0;

	nls_codepage = load_nls_default();

	/*
	 * need to prevent multiple threads trying to simultaneously reconnect
	 * the same SMB session
	 */
	mutex_lock(&tcon->ses->session_mutex);

	/*
	 * Recheck after acquire mutex. If another thread is negotiating
	 * and the server never sends an answer the socket will be closed
	 * and tcpStatus set to reconnect.
	 */
	if (server->tcpStatus == CifsNeedReconnect) {
		rc = -EHOSTDOWN;
		mutex_unlock(&tcon->ses->session_mutex);
		goto out;
	}

	rc = cifs_negotiate_protocol(0, tcon->ses);
	if (!rc && tcon->ses->need_reconnect)
		rc = cifs_setup_session(0, tcon->ses, nls_codepage);

	if (rc || !tcon->need_reconnect) {
		mutex_unlock(&tcon->ses->session_mutex);
		goto out;
	}

	cifs_mark_open_files_invalid(tcon);
	if (tcon->use_persistent)
		tcon->need_reopen_files = true;

	rc = __smb2_reconnect(nls_codepage, tcon);
	mutex_unlock(&tcon->ses->session_mutex);

	cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
	if (rc) {
		/* If sess reconnected but tcon didn't, something strange ... */
		printk_once(KERN_WARNING "reconnect tcon failed rc = %d\n", rc);
		goto out;
	}

	if (smb2_command != SMB2_INTERNAL_CMD)
		queue_delayed_work(cifsiod_wq, &server->reconnect, 0);

	atomic_inc(&tconInfoReconnectCount);
out:
	/*
	 * Check if handle based operation so we know whether we can continue
	 * or not without returning to caller to reset file handle.
	 */
	/*
	 * BB Is flush done by server on drop of tcp session? Should we special
	 * case it and skip above?
	 */
	switch (smb2_command) {
	case SMB2_FLUSH:
	case SMB2_READ:
	case SMB2_WRITE:
	case SMB2_LOCK:
	case SMB2_IOCTL:
	case SMB2_QUERY_DIRECTORY:
	case SMB2_CHANGE_NOTIFY:
	case SMB2_QUERY_INFO:
	case SMB2_SET_INFO:
		rc = -EAGAIN;
	}
	unload_nls(nls_codepage);
	return rc;
}

static void
fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon, void *buf,
	       unsigned int *total_len)
{
	struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
	/* lookup word count ie StructureSize from table */
	__u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];

	/*
	 * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
	 * largest operations (Create)
	 */
	memset(buf, 0, 256);

	smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon);
	spdu->StructureSize2 = cpu_to_le16(parmsize);

	*total_len = parmsize + sizeof(struct smb2_sync_hdr);
}

/*
 * Allocate and return pointer to an SMB request hdr, and set basic
 * SMB information in the SMB header. If the return code is zero, this
 * function must have filled in request_buf pointer.
 */
static int __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
				  void **request_buf, unsigned int *total_len)
{
	/* BB eventually switch this to SMB2 specific small buf size */
	if (smb2_command == SMB2_SET_INFO)
		*request_buf = cifs_buf_get();
	else
		*request_buf = cifs_small_buf_get();
	if (*request_buf == NULL) {
		/* BB should we add a retry in here if not a writepage? */
		return -ENOMEM;
	}

	fill_small_buf(smb2_command, tcon,
		       (struct smb2_sync_hdr *)(*request_buf),
		       total_len);

	if (tcon != NULL) {
		uint16_t com_code = le16_to_cpu(smb2_command);
		cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
		cifs_stats_inc(&tcon->num_smbs_sent);
	}

	return 0;
}

static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
			       void **request_buf, unsigned int *total_len)
{
	int rc;

	rc = smb2_reconnect(smb2_command, tcon);
	if (rc)
		return rc;

	return __smb2_plain_req_init(smb2_command, tcon, request_buf,
				     total_len);
}

static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon,
			       void **request_buf, unsigned int *total_len)
{
	/* Skip reconnect only for FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs */
	if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) {
		return __smb2_plain_req_init(SMB2_IOCTL, tcon, request_buf,
					     total_len);
	}
	return smb2_plain_req_init(SMB2_IOCTL, tcon, request_buf, total_len);
}

/* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */

static void
build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
{
	pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
	pneg_ctxt->DataLength = cpu_to_le16(38);
	pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
	pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
	get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
	pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
}

static void
build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt)
{
	pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;
	pneg_ctxt->DataLength =
		cpu_to_le16(sizeof(struct smb2_compression_capabilities_context)
			  - sizeof(struct smb2_neg_context));
	pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3);
	pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77;
	pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF;
	pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1;
}

static void
build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
{
	pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
	pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + two ciphers */
	pneg_ctxt->CipherCount = cpu_to_le16(2);
	pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
	pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
}

static unsigned int
build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname)
{
	struct nls_table *cp = load_nls_default();

	pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID;

	/* copy up to max of first 100 bytes of server name to NetName field */
	pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp));
	/* context size is DataLength + minimal smb2_neg_context */
	return DIV_ROUND_UP(le16_to_cpu(pneg_ctxt->DataLength) +
			sizeof(struct smb2_neg_context), 8) * 8;
}

static void
build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
{
	pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
	pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
	/* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
	pneg_ctxt->Name[0] = 0x93;
	pneg_ctxt->Name[1] = 0xAD;
	pneg_ctxt->Name[2] = 0x25;
	pneg_ctxt->Name[3] = 0x50;
	pneg_ctxt->Name[4] = 0x9C;
	pneg_ctxt->Name[5] = 0xB4;
	pneg_ctxt->Name[6] = 0x11;
	pneg_ctxt->Name[7] = 0xE7;
	pneg_ctxt->Name[8] = 0xB4;
	pneg_ctxt->Name[9] = 0x23;
	pneg_ctxt->Name[10] = 0x83;
	pneg_ctxt->Name[11] = 0xDE;
	pneg_ctxt->Name[12] = 0x96;
	pneg_ctxt->Name[13] = 0x8B;
	pneg_ctxt->Name[14] = 0xCD;
	pneg_ctxt->Name[15] = 0x7C;
}

static void
assemble_neg_contexts(struct smb2_negotiate_req *req,
		      struct TCP_Server_Info *server, unsigned int *total_len)
{
	char *pneg_ctxt;
	unsigned int ctxt_len;

	if (*total_len > 200) {
		/* In case length corrupted don't want to overrun smb buffer */
		cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n");
		return;
	}

	/*
	 * round up total_len of fixed part of SMB3 negotiate request to 8
	 * byte boundary before adding negotiate contexts
	 */
	*total_len = roundup(*total_len, 8);

	pneg_ctxt = (*total_len) + (char *)req;
	req->NegotiateContextOffset = cpu_to_le32(*total_len);

	build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
	ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
	*total_len += ctxt_len;
	pneg_ctxt += ctxt_len;

	build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
	ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
	*total_len += ctxt_len;
	pneg_ctxt += ctxt_len;

	if (server->compress_algorithm) {
		build_compression_ctxt((struct smb2_compression_capabilities_context *)
				pneg_ctxt);
		ctxt_len = DIV_ROUND_UP(
			sizeof(struct smb2_compression_capabilities_context),
				8) * 8;
		*total_len += ctxt_len;
		pneg_ctxt += ctxt_len;
		req->NegotiateContextCount = cpu_to_le16(5);
	} else
		req->NegotiateContextCount = cpu_to_le16(4);

	ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
					server->hostname);
	*total_len += ctxt_len;
	pneg_ctxt += ctxt_len;

	build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
	*total_len += sizeof(struct smb2_posix_neg_context);
}

static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
{
	unsigned int len = le16_to_cpu(ctxt->DataLength);

	/* If invalid preauth context warn but use what we requested, SHA-512 */
	if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
		printk_once(KERN_WARNING "server sent bad preauth context\n");
		return;
	}
	if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
		printk_once(KERN_WARNING "illegal SMB3 hash algorithm count\n");
	if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
		printk_once(KERN_WARNING "unknown SMB3 hash algorithm\n");
}

static void decode_compress_ctx(struct TCP_Server_Info *server,
			 struct smb2_compression_capabilities_context *ctxt)
{
	unsigned int len = le16_to_cpu(ctxt->DataLength);

	/* sizeof compress context is a one element compression capbility struct */
	if (len < 10) {
		printk_once(KERN_WARNING "server sent bad compression cntxt\n");
		return;
	}
	if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {
		printk_once(KERN_WARNING "illegal SMB3 compress algorithm count\n");
		return;
	}
	if (le16_to_cpu(ctxt->CompressionAlgorithms[0]) > 3) {
		printk_once(KERN_WARNING "unknown compression algorithm\n");
		return;
	}
	server->compress_algorithm = ctxt->CompressionAlgorithms[0];
}

static int decode_encrypt_ctx(struct TCP_Server_Info *server,
			      struct smb2_encryption_neg_context *ctxt)
{
	unsigned int len = le16_to_cpu(ctxt->DataLength);

	cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
	if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
		printk_once(KERN_WARNING "server sent bad crypto ctxt len\n");
		return -EINVAL;
	}

	if (le16_to_cpu(ctxt->CipherCount) != 1) {
		printk_once(KERN_WARNING "illegal SMB3.11 cipher count\n");
		return -EINVAL;
	}
	cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
	if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
	    (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM)) {
		printk_once(KERN_WARNING "invalid SMB3.11 cipher returned\n");
		return -EINVAL;
	}
	server->cipher_type = ctxt->Ciphers[0];
	server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
	return 0;
}

static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
				     struct TCP_Server_Info *server,
				     unsigned int len_of_smb)
{
	struct smb2_neg_context *pctx;
	unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
	unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
	unsigned int len_of_ctxts, i;
	int rc = 0;

	cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
	if (len_of_smb <= offset) {
		cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n");
		return -EINVAL;
	}

	len_of_ctxts = len_of_smb - offset;

	for (i = 0; i < ctxt_cnt; i++) {
		int clen;
		/* check that offset is not beyond end of SMB */
		if (len_of_ctxts == 0)
			break;

		if (len_of_ctxts < sizeof(struct smb2_neg_context))
			break;

		pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
		clen = le16_to_cpu(pctx->DataLength);
		if (clen > len_of_ctxts)
			break;

		if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
			decode_preauth_context(
				(struct smb2_preauth_neg_context *)pctx);
		else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
			rc = decode_encrypt_ctx(server,
				(struct smb2_encryption_neg_context *)pctx);
		else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)
			decode_compress_ctx(server,
				(struct smb2_compression_capabilities_context *)pctx);
		else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
			server->posix_ext_supported = true;
		else
			cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n",
				le16_to_cpu(pctx->ContextType));

		if (rc)
			break;
		/* offsets must be 8 byte aligned */
		clen = (clen + 7) & ~0x7;
		offset += clen + sizeof(struct smb2_neg_context);
		len_of_ctxts -= clen;
	}
	return rc;
}

static struct create_posix *
create_posix_buf(umode_t mode)
{
	struct create_posix *buf;

	buf = kzalloc(sizeof(struct create_posix),
			GFP_KERNEL);
	if (!buf)
		return NULL;

	buf->ccontext.DataOffset =
		cpu_to_le16(offsetof(struct create_posix, Mode));
	buf->ccontext.DataLength = cpu_to_le32(4);
	buf->ccontext.NameOffset =
		cpu_to_le16(offsetof(struct create_posix, Name));
	buf->ccontext.NameLength = cpu_to_le16(16);

	/* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
	buf->Name[0] = 0x93;
	buf->Name[1] = 0xAD;
	buf->Name[2] = 0x25;
	buf->Name[3] = 0x50;
	buf->Name[4] = 0x9C;
	buf->Name[5] = 0xB4;
	buf->Name[6] = 0x11;
	buf->Name[7] = 0xE7;
	buf->Name[8] = 0xB4;
	buf->Name[9] = 0x23;
	buf->Name[10] = 0x83;
	buf->Name[11] = 0xDE;
	buf->Name[12] = 0x96;
	buf->Name[13] = 0x8B;
	buf->Name[14] = 0xCD;
	buf->Name[15] = 0x7C;
	buf->Mode = cpu_to_le32(mode);
	cifs_dbg(FYI, "mode on posix create 0%o", mode);
	return buf;
}

static int
add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
{
	struct smb2_create_req *req = iov[0].iov_base;
	unsigned int num = *num_iovec;

	iov[num].iov_base = create_posix_buf(mode);
	if (mode == ACL_NO_MODE)
		cifs_dbg(FYI, "illegal mode\n");
	if (iov[num].iov_base == NULL)
		return -ENOMEM;
	iov[num].iov_len = sizeof(struct create_posix);
	if (!req->CreateContextsOffset)
		req->CreateContextsOffset = cpu_to_le32(
				sizeof(struct smb2_create_req) +
				iov[num - 1].iov_len);
	le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
	*num_iovec = num + 1;
	return 0;
}


/*
 *
 *	SMB2 Worker functions follow:
 *
 *	The general structure of the worker functions is:
 *	1) Call smb2_init (assembles SMB2 header)
 *	2) Initialize SMB2 command specific fields in fixed length area of SMB
 *	3) Call smb_sendrcv2 (sends request on socket and waits for response)
 *	4) Decode SMB2 command specific fields in the fixed length area
 *	5) Decode variable length data area (if any for this SMB2 command type)
 *	6) Call free smb buffer
 *	7) return
 *
 */

int
SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
{
	struct smb_rqst rqst;
	struct smb2_negotiate_req *req;
	struct smb2_negotiate_rsp *rsp;
	struct kvec iov[1];
	struct kvec rsp_iov;
	int rc = 0;
	int resp_buftype;
	struct TCP_Server_Info *server = cifs_ses_server(ses);
	int blob_offset, blob_length;
	char *security_blob;
	int flags = CIFS_NEG_OP;
	unsigned int total_len;

	cifs_dbg(FYI, "Negotiate protocol\n");

	if (!server) {
		WARN(1, "%s: server is NULL!\n", __func__);
		return -EIO;
	}

	rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, (void **) &req, &total_len);
	if (rc)
		return rc;

	req->sync_hdr.SessionId = 0;

	memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
	memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);

	if (strcmp(server->vals->version_string,
		   SMB3ANY_VERSION_STRING) == 0) {
		req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
		req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
		req->DialectCount = cpu_to_le16(2);
		total_len += 4;
	} else if (strcmp(server->vals->version_string,
		   SMBDEFAULT_VERSION_STRING) == 0) {
		req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
		req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
		req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
		req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
		req->DialectCount = cpu_to_le16(4);
		total_len += 8;
	} else {
		/* otherwise send specific dialect */
		req->Dialects[0] = cpu_to_le16(server->vals->protocol_id);
		req->DialectCount = cpu_to_le16(1);
		total_len += 2;
	}

	/* only one of SMB2 signing flags may be set in SMB2 request */
	if (ses->sign)
		req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
	else if (global_secflags & CIFSSEC_MAY_SIGN)
		req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
	else
		req->SecurityMode = 0;

	req->Capabilities = cpu_to_le32(server->vals->req_capabilities);

	/* ClientGUID must be zero for SMB2.02 dialect */
	if (server->vals->protocol_id == SMB20_PROT_ID)
		memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
	else {
		memcpy(req->ClientGUID, server->client_guid,
			SMB2_CLIENT_GUID_SIZE);
		if ((server->vals->protocol_id == SMB311_PROT_ID) ||
		    (strcmp(server->vals->version_string,
		     SMBDEFAULT_VERSION_STRING) == 0))
			assemble_neg_contexts(req, server, &total_len);
	}
	iov[0].iov_base = (char *)req;
	iov[0].iov_len = total_len;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	rqst.rq_iov = iov;
	rqst.rq_nvec = 1;

	rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
	cifs_small_buf_release(req);
	rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
	/*
	 * No tcon so can't do
	 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
	 */
	if (rc == -EOPNOTSUPP) {
		cifs_server_dbg(VFS, "Dialect not supported by server. Consider "
			"specifying vers=1.0 or vers=2.0 on mount for accessing"
			" older servers\n");
		goto neg_exit;
	} else if (rc != 0)
		goto neg_exit;

	if (strcmp(server->vals->version_string,
		   SMB3ANY_VERSION_STRING) == 0) {
		if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
			cifs_server_dbg(VFS,
				"SMB2 dialect returned but not requested\n");
			return -EIO;
		} else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
			cifs_server_dbg(VFS,
				"SMB2.1 dialect returned but not requested\n");
			return -EIO;
		}
	} else if (strcmp(server->vals->version_string,
		   SMBDEFAULT_VERSION_STRING) == 0) {
		if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
			cifs_server_dbg(VFS,
				"SMB2 dialect returned but not requested\n");
			return -EIO;
		} else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
			/* ops set to 3.0 by default for default so update */
			server->ops = &smb21_operations;
			server->vals = &smb21_values;
		} else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
			server->ops = &smb311_operations;
			server->vals = &smb311_values;
		}
	} else if (le16_to_cpu(rsp->DialectRevision) !=
				server->vals->protocol_id) {
		/* if requested single dialect ensure returned dialect matched */
		cifs_server_dbg(VFS, "Illegal 0x%x dialect returned: not requested\n",
			le16_to_cpu(rsp->DialectRevision));
		return -EIO;
	}

	cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);

	if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
		cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
	else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
		cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
	else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
		cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
	else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
		cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
	else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
		cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
	else {
		cifs_server_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
			 le16_to_cpu(rsp->DialectRevision));
		rc = -EIO;
		goto neg_exit;
	}
	server->dialect = le16_to_cpu(rsp->DialectRevision);

	/*
	 * Keep a copy of the hash after negprot. This hash will be
	 * the starting hash value for all sessions made from this
	 * server.
	 */
	memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
	       SMB2_PREAUTH_HASH_SIZE);

	/* SMB2 only has an extended negflavor */
	server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
	/* set it to the maximum buffer size value we can send with 1 credit */
	server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
			       SMB2_MAX_BUFFER_SIZE);
	server->max_read = le32_to_cpu(rsp->MaxReadSize);
	server->max_write = le32_to_cpu(rsp->MaxWriteSize);
	server->sec_mode = le16_to_cpu(rsp->SecurityMode);
	if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
		cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
				server->sec_mode);
	server->capabilities = le32_to_cpu(rsp->Capabilities);
	/* Internal types */
	server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;

	security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
					       (struct smb2_sync_hdr *)rsp);
	/*
	 * See MS-SMB2 section 2.2.4: if no blob, client picks default which
	 * for us will be
	 *	ses->sectype = RawNTLMSSP;
	 * but for time being this is our only auth choice so doesn't matter.
	 * We just found a server which sets blob length to zero expecting raw.
	 */
	if (blob_length == 0) {
		cifs_dbg(FYI, "missing security blob on negprot\n");
		server->sec_ntlmssp = true;
	}

	rc = cifs_enable_signing(server, ses->sign);
	if (rc)
		goto neg_exit;
	if (blob_length) {
		rc = decode_negTokenInit(security_blob, blob_length, server);
		if (rc == 1)
			rc = 0;
		else if (rc == 0)
			rc = -EIO;
	}

	if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
		if (rsp->NegotiateContextCount)
			rc = smb311_decode_neg_context(rsp, server,
						       rsp_iov.iov_len);
		else
			cifs_server_dbg(VFS, "Missing expected negotiate contexts\n");
	}
neg_exit:
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}

int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
{
	int rc;
	struct validate_negotiate_info_req *pneg_inbuf;
	struct validate_negotiate_info_rsp *pneg_rsp = NULL;
	u32 rsplen;
	u32 inbuflen; /* max of 4 dialects */
	struct TCP_Server_Info *server = tcon->ses->server;

	cifs_dbg(FYI, "validate negotiate\n");

	/* In SMB3.11 preauth integrity supersedes validate negotiate */
	if (server->dialect == SMB311_PROT_ID)
		return 0;

	/*
	 * validation ioctl must be signed, so no point sending this if we
	 * can not sign it (ie are not known user).  Even if signing is not
	 * required (enabled but not negotiated), in those cases we selectively
	 * sign just this, the first and only signed request on a connection.
	 * Having validation of negotiate info  helps reduce attack vectors.
	 */
	if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
		return 0; /* validation requires signing */

	if (tcon->ses->user_name == NULL) {
		cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
		return 0; /* validation requires signing */
	}

	if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
		cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");

	pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
	if (!pneg_inbuf)
		return -ENOMEM;

	pneg_inbuf->Capabilities =
			cpu_to_le32(server->vals->req_capabilities);
	memcpy(pneg_inbuf->Guid, server->client_guid,
					SMB2_CLIENT_GUID_SIZE);

	if (tcon->ses->sign)
		pneg_inbuf->SecurityMode =
			cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
	else if (global_secflags & CIFSSEC_MAY_SIGN)
		pneg_inbuf->SecurityMode =
			cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
	else
		pneg_inbuf->SecurityMode = 0;


	if (strcmp(server->vals->version_string,
		SMB3ANY_VERSION_STRING) == 0) {
		pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
		pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
		pneg_inbuf->DialectCount = cpu_to_le16(2);
		/* structure is big enough for 3 dialects, sending only 2 */
		inbuflen = sizeof(*pneg_inbuf) -
				(2 * sizeof(pneg_inbuf->Dialects[0]));
	} else if (strcmp(server->vals->version_string,
		SMBDEFAULT_VERSION_STRING) == 0) {
		pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
		pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
		pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
		pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
		pneg_inbuf->DialectCount = cpu_to_le16(4);
		/* structure is big enough for 3 dialects */
		inbuflen = sizeof(*pneg_inbuf);
	} else {
		/* otherwise specific dialect was requested */
		pneg_inbuf->Dialects[0] =
			cpu_to_le16(server->vals->protocol_id);
		pneg_inbuf->DialectCount = cpu_to_le16(1);
		/* structure is big enough for 3 dialects, sending only 1 */
		inbuflen = sizeof(*pneg_inbuf) -
				sizeof(pneg_inbuf->Dialects[0]) * 2;
	}

	rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
		FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
		(char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
		(char **)&pneg_rsp, &rsplen);
	if (rc == -EOPNOTSUPP) {
		/*
		 * Old Windows versions or Netapp SMB server can return
		 * not supported error. Client should accept it.
		 */
		cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n");
		rc = 0;
		goto out_free_inbuf;
	} else if (rc != 0) {
		cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
		rc = -EIO;
		goto out_free_inbuf;
	}

	rc = -EIO;
	if (rsplen != sizeof(*pneg_rsp)) {
		cifs_tcon_dbg(VFS, "invalid protocol negotiate response size: %d\n",
			 rsplen);

		/* relax check since Mac returns max bufsize allowed on ioctl */
		if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
			goto out_free_rsp;
	}

	/* check validate negotiate info response matches what we got earlier */
	if (pneg_rsp->Dialect != cpu_to_le16(server->dialect))
		goto vneg_out;

	if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode))
		goto vneg_out;

	/* do not validate server guid because not saved at negprot time yet */

	if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
	      SMB2_LARGE_FILES) != server->capabilities)
		goto vneg_out;

	/* validate negotiate successful */
	rc = 0;
	cifs_dbg(FYI, "validate negotiate info successful\n");
	goto out_free_rsp;

vneg_out:
	cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n");
out_free_rsp:
	kfree(pneg_rsp);
out_free_inbuf:
	kfree(pneg_inbuf);
	return rc;
}

enum securityEnum
smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
{
	switch (requested) {
	case Kerberos:
	case RawNTLMSSP:
		return requested;
	case NTLMv2:
		return RawNTLMSSP;
	case Unspecified:
		if (server->sec_ntlmssp &&
			(global_secflags & CIFSSEC_MAY_NTLMSSP))
			return RawNTLMSSP;
		if ((server->sec_kerberos || server->sec_mskerberos) &&
			(global_secflags & CIFSSEC_MAY_KRB5))
			return Kerberos;
		/* Fallthrough */
	default:
		return Unspecified;
	}
}

struct SMB2_sess_data {
	unsigned int xid;
	struct cifs_ses *ses;
	struct nls_table *nls_cp;
	void (*func)(struct SMB2_sess_data *);
	int result;
	u64 previous_session;

	/* we will send the SMB in three pieces:
	 * a fixed length beginning part, an optional
	 * SPNEGO blob (which can be zero length), and a
	 * last part which will include the strings
	 * and rest of bcc area. This allows us to avoid
	 * a large buffer 17K allocation
	 */
	int buf0_type;
	struct kvec iov[2];
};

static int
SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
{
	int rc;
	struct cifs_ses *ses = sess_data->ses;
	struct smb2_sess_setup_req *req;
	struct TCP_Server_Info *server = cifs_ses_server(ses);
	unsigned int total_len;

	rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, (void **) &req,
			     &total_len);
	if (rc)
		return rc;

	if (sess_data->ses->binding) {
		req->sync_hdr.SessionId = sess_data->ses->Suid;
		req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
		req->PreviousSessionId = 0;
		req->Flags = SMB2_SESSION_REQ_FLAG_BINDING;
	} else {
		/* First session, not a reauthenticate */
		req->sync_hdr.SessionId = 0;
		/*
		 * if reconnect, we need to send previous sess id
		 * otherwise it is 0
		 */
		req->PreviousSessionId = sess_data->previous_session;
		req->Flags = 0; /* MBZ */
	}

	/* enough to enable echos and oplocks and one max size write */
	req->sync_hdr.CreditRequest = cpu_to_le16(130);

	/* only one of SMB2 signing flags may be set in SMB2 request */
	if (server->sign)
		req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
	else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
		req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
	else
		req->SecurityMode = 0;

#ifdef CONFIG_CIFS_DFS_UPCALL
	req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
#else
	req->Capabilities = 0;
#endif /* DFS_UPCALL */

	req->Channel = 0; /* MBZ */

	sess_data->iov[0].iov_base = (char *)req;
	/* 1 for pad */
	sess_data->iov[0].iov_len = total_len - 1;
	/*
	 * This variable will be used to clear the buffer
	 * allocated above in case of any error in the calling function.
	 */
	sess_data->buf0_type = CIFS_SMALL_BUFFER;

	return 0;
}

static void
SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
{
	free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
	sess_data->buf0_type = CIFS_NO_BUFFER;
}

static int
SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
{
	int rc;
	struct smb_rqst rqst;
	struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
	struct kvec rsp_iov = { NULL, 0 };

	/* Testing shows that buffer offset must be at location of Buffer[0] */
	req->SecurityBufferOffset =
		cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
	req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);

	memset(&rqst, 0, sizeof(struct smb_rqst));
	rqst.rq_iov = sess_data->iov;
	rqst.rq_nvec = 2;

	/* BB add code to build os and lm fields */
	rc = cifs_send_recv(sess_data->xid, sess_data->ses,
			    &rqst,
			    &sess_data->buf0_type,
			    CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
	cifs_small_buf_release(sess_data->iov[0].iov_base);
	memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));

	return rc;
}

static int
SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
{
	int rc = 0;
	struct cifs_ses *ses = sess_data->ses;
	struct TCP_Server_Info *server = cifs_ses_server(ses);

	mutex_lock(&server->srv_mutex);
	if (server->ops->generate_signingkey) {
		rc = server->ops->generate_signingkey(ses);
		if (rc) {
			cifs_dbg(FYI,
				"SMB3 session key generation failed\n");
			mutex_unlock(&server->srv_mutex);
			return rc;
		}
	}
	if (!server->session_estab) {
		server->sequence_number = 0x2;
		server->session_estab = true;
	}
	mutex_unlock(&server->srv_mutex);

	cifs_dbg(FYI, "SMB2/3 session established successfully\n");
	/* keep existing ses state if binding */
	if (!ses->binding) {
		spin_lock(&GlobalMid_Lock);
		ses->status = CifsGood;
		ses->need_reconnect = false;
		spin_unlock(&GlobalMid_Lock);
	}

	return rc;
}

#ifdef CONFIG_CIFS_UPCALL
static void
SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
{
	int rc;
	struct cifs_ses *ses = sess_data->ses;
	struct cifs_spnego_msg *msg;
	struct key *spnego_key = NULL;
	struct smb2_sess_setup_rsp *rsp = NULL;

	rc = SMB2_sess_alloc_buffer(sess_data);
	if (rc)
		goto out;

	spnego_key = cifs_get_spnego_key(ses);
	if (IS_ERR(spnego_key)) {
		rc = PTR_ERR(spnego_key);
		spnego_key = NULL;
		goto out;
	}

	msg = spnego_key->payload.data[0];
	/*
	 * check version field to make sure that cifs.upcall is
	 * sending us a response in an expected form
	 */
	if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
		cifs_dbg(VFS,
			  "bad cifs.upcall version. Expected %d got %d",
			  CIFS_SPNEGO_UPCALL_VERSION, msg->version);
		rc = -EKEYREJECTED;
		goto out_put_spnego_key;
	}

	/* keep session key if binding */
	if (!ses->binding) {
		ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
						 GFP_KERNEL);
		if (!ses->auth_key.response) {
			cifs_dbg(VFS,
				 "Kerberos can't allocate (%u bytes) memory",
				 msg->sesskey_len);
			rc = -ENOMEM;
			goto out_put_spnego_key;
		}
		ses->auth_key.len = msg->sesskey_len;
	}

	sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
	sess_data->iov[1].iov_len = msg->secblob_len;

	rc = SMB2_sess_sendreceive(sess_data);
	if (rc)
		goto out_put_spnego_key;

	rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
	/* keep session id and flags if binding */
	if (!ses->binding) {
		ses->Suid = rsp->sync_hdr.SessionId;
		ses->session_flags = le16_to_cpu(rsp->SessionFlags);
	}

	rc = SMB2_sess_establish_session(sess_data);
out_put_spnego_key:
	key_invalidate(spnego_key);
	key_put(spnego_key);
out:
	sess_data->result = rc;
	sess_data->func = NULL;
	SMB2_sess_free_buffer(sess_data);
}
#else
static void
SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
{
	cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
	sess_data->result = -EOPNOTSUPP;
	sess_data->func = NULL;
}
#endif

static void
SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);

static void
SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
{
	int rc;
	struct cifs_ses *ses = sess_data->ses;
	struct smb2_sess_setup_rsp *rsp = NULL;
	char *ntlmssp_blob = NULL;
	bool use_spnego = false; /* else use raw ntlmssp */
	u16 blob_length = 0;

	/*
	 * If memory allocation is successful, caller of this function
	 * frees it.
	 */
	ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
	if (!ses->ntlmssp) {
		rc = -ENOMEM;
		goto out_err;
	}
	ses->ntlmssp->sesskey_per_smbsess = true;

	rc = SMB2_sess_alloc_buffer(sess_data);
	if (rc)
		goto out_err;

	ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
			       GFP_KERNEL);
	if (ntlmssp_blob == NULL) {
		rc = -ENOMEM;
		goto out;
	}

	build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
	if (use_spnego) {
		/* BB eventually need to add this */
		cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
		rc = -EOPNOTSUPP;
		goto out;
	} else {
		blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
		/* with raw NTLMSSP we don't encapsulate in SPNEGO */
	}
	sess_data->iov[1].iov_base = ntlmssp_blob;
	sess_data->iov[1].iov_len = blob_length;

	rc = SMB2_sess_sendreceive(sess_data);
	rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;

	/* If true, rc here is expected and not an error */
	if (sess_data->buf0_type != CIFS_NO_BUFFER &&
		rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
		rc = 0;

	if (rc)
		goto out;

	if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
			le16_to_cpu(rsp->SecurityBufferOffset)) {
		cifs_dbg(VFS, "Invalid security buffer offset %d\n",
			le16_to_cpu(rsp->SecurityBufferOffset));
		rc = -EIO;
		goto out;
	}
	rc = decode_ntlmssp_challenge(rsp->Buffer,
			le16_to_cpu(rsp->SecurityBufferLength), ses);
	if (rc)
		goto out;

	cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");

	/* keep existing ses id and flags if binding */
	if (!ses->binding) {
		ses->Suid = rsp->sync_hdr.SessionId;
		ses->session_flags = le16_to_cpu(rsp->SessionFlags);
	}

out:
	kfree(ntlmssp_blob);
	SMB2_sess_free_buffer(sess_data);
	if (!rc) {
		sess_data->result = 0;
		sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
		return;
	}
out_err:
	kfree(ses->ntlmssp);
	ses->ntlmssp = NULL;
	sess_data->result = rc;
	sess_data->func = NULL;
}

static void
SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
{
	int rc;
	struct cifs_ses *ses = sess_data->ses;
	struct smb2_sess_setup_req *req;
	struct smb2_sess_setup_rsp *rsp = NULL;
	unsigned char *ntlmssp_blob = NULL;
	bool use_spnego = false; /* else use raw ntlmssp */
	u16 blob_length = 0;

	rc = SMB2_sess_alloc_buffer(sess_data);
	if (rc)
		goto out;

	req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
	req->sync_hdr.SessionId = ses->Suid;

	rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
					sess_data->nls_cp);
	if (rc) {
		cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
		goto out;
	}

	if (use_spnego) {
		/* BB eventually need to add this */
		cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
		rc = -EOPNOTSUPP;
		goto out;
	}
	sess_data->iov[1].iov_base = ntlmssp_blob;
	sess_data->iov[1].iov_len = blob_length;

	rc = SMB2_sess_sendreceive(sess_data);
	if (rc)
		goto out;

	rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;

	/* keep existing ses id and flags if binding */
	if (!ses->binding) {
		ses->Suid = rsp->sync_hdr.SessionId;
		ses->session_flags = le16_to_cpu(rsp->SessionFlags);
	}

	rc = SMB2_sess_establish_session(sess_data);
out:
	kfree(ntlmssp_blob);
	SMB2_sess_free_buffer(sess_data);
	kfree(ses->ntlmssp);
	ses->ntlmssp = NULL;
	sess_data->result = rc;
	sess_data->func = NULL;
}

static int
SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
{
	int type;

	type = smb2_select_sectype(cifs_ses_server(ses), ses->sectype);
	cifs_dbg(FYI, "sess setup type %d\n", type);
	if (type == Unspecified) {
		cifs_dbg(VFS,
			"Unable to select appropriate authentication method!");
		return -EINVAL;
	}

	switch (type) {
	case Kerberos:
		sess_data->func = SMB2_auth_kerberos;
		break;
	case RawNTLMSSP:
		sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
		break;
	default:
		cifs_dbg(VFS, "secType %d not supported!\n", type);
		return -EOPNOTSUPP;
	}

	return 0;
}

int
SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
		const struct nls_table *nls_cp)
{
	int rc = 0;
	struct TCP_Server_Info *server = cifs_ses_server(ses);
	struct SMB2_sess_data *sess_data;

	cifs_dbg(FYI, "Session Setup\n");

	if (!server) {
		WARN(1, "%s: server is NULL!\n", __func__);
		return -EIO;
	}

	sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
	if (!sess_data)
		return -ENOMEM;

	rc = SMB2_select_sec(ses, sess_data);
	if (rc)
		goto out;
	sess_data->xid = xid;
	sess_data->ses = ses;
	sess_data->buf0_type = CIFS_NO_BUFFER;
	sess_data->nls_cp = (struct nls_table *) nls_cp;
	sess_data->previous_session = ses->Suid;

	/*
	 * Initialize the session hash with the server one.
	 */
	memcpy(ses->preauth_sha_hash, server->preauth_sha_hash,
	       SMB2_PREAUTH_HASH_SIZE);

	while (sess_data->func)
		sess_data->func(sess_data);

	if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
		cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");
	rc = sess_data->result;
out:
	kfree(sess_data);
	return rc;
}

int
SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
{
	struct smb_rqst rqst;
	struct smb2_logoff_req *req; /* response is also trivial struct */
	int rc = 0;
	struct TCP_Server_Info *server;
	int flags = 0;
	unsigned int total_len;
	struct kvec iov[1];
	struct kvec rsp_iov;
	int resp_buf_type;

	cifs_dbg(FYI, "disconnect session %p\n", ses);

	if (ses && (ses->server))
		server = ses->server;
	else
		return -EIO;

	/* no need to send SMB logoff if uid already closed due to reconnect */
	if (ses->need_reconnect)
		goto smb2_session_already_dead;

	rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, (void **) &req, &total_len);
	if (rc)
		return rc;

	 /* since no tcon, smb2_init can not do this, so do here */
	req->sync_hdr.SessionId = ses->Suid;

	if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
		flags |= CIFS_TRANSFORM_REQ;
	else if (server->sign)
		req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;

	flags |= CIFS_NO_RSP_BUF;

	iov[0].iov_base = (char *)req;
	iov[0].iov_len = total_len;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	rqst.rq_iov = iov;
	rqst.rq_nvec = 1;

	rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
	cifs_small_buf_release(req);
	/*
	 * No tcon so can't do
	 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
	 */

smb2_session_already_dead:
	return rc;
}

static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
{
	cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
}

#define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)

/* These are similar values to what Windows uses */
static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
{
	tcon->max_chunks = 256;
	tcon->max_bytes_chunk = 1048576;
	tcon->max_bytes_copy = 16777216;
}

int
SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
	  struct cifs_tcon *tcon, const struct nls_table *cp)
{
	struct smb_rqst rqst;
	struct smb2_tree_connect_req *req;
	struct smb2_tree_connect_rsp *rsp = NULL;
	struct kvec iov[2];
	struct kvec rsp_iov = { NULL, 0 };
	int rc = 0;
	int resp_buftype;
	int unc_path_len;
	__le16 *unc_path = NULL;
	int flags = 0;
	unsigned int total_len;
	struct TCP_Server_Info *server = ses->server;

	cifs_dbg(FYI, "TCON\n");

	if (!server || !tree)
		return -EIO;

	unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
	if (unc_path == NULL)
		return -ENOMEM;

	unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
	unc_path_len *= 2;
	if (unc_path_len < 2) {
		kfree(unc_path);
		return -EINVAL;
	}

	/* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
	tcon->tid = 0;
	atomic_set(&tcon->num_remote_opens, 0);
	rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, (void **) &req,
			     &total_len);
	if (rc) {
		kfree(unc_path);
		return rc;
	}

	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	iov[0].iov_base = (char *)req;
	/* 1 for pad */
	iov[0].iov_len = total_len - 1;

	/* Testing shows that buffer offset must be at location of Buffer[0] */
	req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
			- 1 /* pad */);
	req->PathLength = cpu_to_le16(unc_path_len - 2);
	iov[1].iov_base = unc_path;
	iov[1].iov_len = unc_path_len;

	/*
	 * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
	 * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
	 * (Samba servers don't always set the flag so also check if null user)
	 */
	if ((server->dialect == SMB311_PROT_ID) &&
	    !smb3_encryption_required(tcon) &&
	    !(ses->session_flags &
		    (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
	    ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
		req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	rqst.rq_iov = iov;
	rqst.rq_nvec = 2;

	/* Need 64 for max size write so ask for more in case not there yet */
	req->sync_hdr.CreditRequest = cpu_to_le16(64);

	rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
	cifs_small_buf_release(req);
	rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
	trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
	if (rc != 0) {
		if (tcon) {
			cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
			tcon->need_reconnect = true;
		}
		goto tcon_error_exit;
	}

	switch (rsp->ShareType) {
	case SMB2_SHARE_TYPE_DISK:
		cifs_dbg(FYI, "connection to disk share\n");
		break;
	case SMB2_SHARE_TYPE_PIPE:
		tcon->pipe = true;
		cifs_dbg(FYI, "connection to pipe share\n");
		break;
	case SMB2_SHARE_TYPE_PRINT:
		tcon->print = true;
		cifs_dbg(FYI, "connection to printer\n");
		break;
	default:
		cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
		rc = -EOPNOTSUPP;
		goto tcon_error_exit;
	}

	tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
	tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
	tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
	tcon->tidStatus = CifsGood;
	tcon->need_reconnect = false;
	tcon->tid = rsp->sync_hdr.TreeId;
	strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));

	if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
	    ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
		cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");

	if (tcon->seal &&
	    !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
		cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");

	init_copy_chunk_defaults(tcon);
	if (server->ops->validate_negotiate)
		rc = server->ops->validate_negotiate(xid, tcon);
tcon_exit:

	free_rsp_buf(resp_buftype, rsp);
	kfree(unc_path);
	return rc;

tcon_error_exit:
	if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
		cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
	}
	goto tcon_exit;
}

int
SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
{
	struct smb_rqst rqst;
	struct smb2_tree_disconnect_req *req; /* response is trivial */
	int rc = 0;
	struct cifs_ses *ses = tcon->ses;
	int flags = 0;
	unsigned int total_len;
	struct kvec iov[1];
	struct kvec rsp_iov;
	int resp_buf_type;

	cifs_dbg(FYI, "Tree Disconnect\n");

	if (!ses || !(ses->server))
		return -EIO;

	if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
		return 0;

	close_shroot_lease(&tcon->crfid);

	rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req,
			     &total_len);
	if (rc)
		return rc;

	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	flags |= CIFS_NO_RSP_BUF;

	iov[0].iov_base = (char *)req;
	iov[0].iov_len = total_len;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	rqst.rq_iov = iov;
	rqst.rq_nvec = 1;

	rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
	cifs_small_buf_release(req);
	if (rc)
		cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);

	return rc;
}


static struct create_durable *
create_durable_buf(void)
{
	struct create_durable *buf;

	buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
	if (!buf)
		return NULL;

	buf->ccontext.DataOffset = cpu_to_le16(offsetof
					(struct create_durable, Data));
	buf->ccontext.DataLength = cpu_to_le32(16);
	buf->ccontext.NameOffset = cpu_to_le16(offsetof
				(struct create_durable, Name));
	buf->ccontext.NameLength = cpu_to_le16(4);
	/* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
	buf->Name[0] = 'D';
	buf->Name[1] = 'H';
	buf->Name[2] = 'n';
	buf->Name[3] = 'Q';
	return buf;
}

static struct create_durable *
create_reconnect_durable_buf(struct cifs_fid *fid)
{
	struct create_durable *buf;

	buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
	if (!buf)
		return NULL;

	buf->ccontext.DataOffset = cpu_to_le16(offsetof
					(struct create_durable, Data));
	buf->ccontext.DataLength = cpu_to_le32(16);
	buf->ccontext.NameOffset = cpu_to_le16(offsetof
				(struct create_durable, Name));
	buf->ccontext.NameLength = cpu_to_le16(4);
	buf->Data.Fid.PersistentFileId = fid->persistent_fid;
	buf->Data.Fid.VolatileFileId = fid->volatile_fid;
	/* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
	buf->Name[0] = 'D';
	buf->Name[1] = 'H';
	buf->Name[2] = 'n';
	buf->Name[3] = 'C';
	return buf;
}

static void
parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
{
	struct create_on_disk_id *pdisk_id = (struct create_on_disk_id *)cc;

	cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
		pdisk_id->DiskFileId, pdisk_id->VolumeId);
	buf->IndexNumber = pdisk_id->DiskFileId;
}

void
smb2_parse_contexts(struct TCP_Server_Info *server,
		       struct smb2_create_rsp *rsp,
		       unsigned int *epoch, char *lease_key, __u8 *oplock,
		       struct smb2_file_all_info *buf)
{
	char *data_offset;
	struct create_context *cc;
	unsigned int next;
	unsigned int remaining;
	char *name;

	*oplock = 0;
	data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
	remaining = le32_to_cpu(rsp->CreateContextsLength);
	cc = (struct create_context *)data_offset;

	/* Initialize inode number to 0 in case no valid data in qfid context */
	if (buf)
		buf->IndexNumber = 0;

	while (remaining >= sizeof(struct create_context)) {
		name = le16_to_cpu(cc->NameOffset) + (char *)cc;
		if (le16_to_cpu(cc->NameLength) == 4 &&
		    strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4) == 0)
			*oplock = server->ops->parse_lease_buf(cc, epoch,
							   lease_key);
		else if (buf && (le16_to_cpu(cc->NameLength) == 4) &&
		    strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4) == 0)
			parse_query_id_ctxt(cc, buf);

		next = le32_to_cpu(cc->Next);
		if (!next)
			break;
		remaining -= next;
		cc = (struct create_context *)((char *)cc + next);
	}

	if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
		*oplock = rsp->OplockLevel;

	return;
}

static int
add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
		  unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
{
	struct smb2_create_req *req = iov[0].iov_base;
	unsigned int num = *num_iovec;

	iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
	if (iov[num].iov_base == NULL)
		return -ENOMEM;
	iov[num].iov_len = server->vals->create_lease_size;
	req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
	if (!req->CreateContextsOffset)
		req->CreateContextsOffset = cpu_to_le32(
				sizeof(struct smb2_create_req) +
				iov[num - 1].iov_len);
	le32_add_cpu(&req->CreateContextsLength,
		     server->vals->create_lease_size);
	*num_iovec = num + 1;
	return 0;
}

static struct create_durable_v2 *
create_durable_v2_buf(struct cifs_open_parms *oparms)
{
	struct cifs_fid *pfid = oparms->fid;
	struct create_durable_v2 *buf;

	buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
	if (!buf)
		return NULL;

	buf->ccontext.DataOffset = cpu_to_le16(offsetof
					(struct create_durable_v2, dcontext));
	buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
	buf->ccontext.NameOffset = cpu_to_le16(offsetof
				(struct create_durable_v2, Name));
	buf->ccontext.NameLength = cpu_to_le16(4);

	/*
	 * NB: Handle timeout defaults to 0, which allows server to choose
	 * (most servers default to 120 seconds) and most clients default to 0.
	 * This can be overridden at mount ("handletimeout=") if the user wants
	 * a different persistent (or resilient) handle timeout for all opens
	 * opens on a particular SMB3 mount.
	 */
	buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
	buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
	generate_random_uuid(buf->dcontext.CreateGuid);
	memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);

	/* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
	buf->Name[0] = 'D';
	buf->Name[1] = 'H';
	buf->Name[2] = '2';
	buf->Name[3] = 'Q';
	return buf;
}

static struct create_durable_handle_reconnect_v2 *
create_reconnect_durable_v2_buf(struct cifs_fid *fid)
{
	struct create_durable_handle_reconnect_v2 *buf;

	buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
			GFP_KERNEL);
	if (!buf)
		return NULL;

	buf->ccontext.DataOffset =
		cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
				     dcontext));
	buf->ccontext.DataLength =
		cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
	buf->ccontext.NameOffset =
		cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
			    Name));
	buf->ccontext.NameLength = cpu_to_le16(4);

	buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
	buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
	buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
	memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);

	/* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
	buf->Name[0] = 'D';
	buf->Name[1] = 'H';
	buf->Name[2] = '2';
	buf->Name[3] = 'C';
	return buf;
}

static int
add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
		    struct cifs_open_parms *oparms)
{
	struct smb2_create_req *req = iov[0].iov_base;
	unsigned int num = *num_iovec;

	iov[num].iov_base = create_durable_v2_buf(oparms);
	if (iov[num].iov_base == NULL)
		return -ENOMEM;
	iov[num].iov_len = sizeof(struct create_durable_v2);
	if (!req->CreateContextsOffset)
		req->CreateContextsOffset =
			cpu_to_le32(sizeof(struct smb2_create_req) +
								iov[1].iov_len);
	le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
	*num_iovec = num + 1;
	return 0;
}

static int
add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
		    struct cifs_open_parms *oparms)
{
	struct smb2_create_req *req = iov[0].iov_base;
	unsigned int num = *num_iovec;

	/* indicate that we don't need to relock the file */
	oparms->reconnect = false;

	iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
	if (iov[num].iov_base == NULL)
		return -ENOMEM;
	iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
	if (!req->CreateContextsOffset)
		req->CreateContextsOffset =
			cpu_to_le32(sizeof(struct smb2_create_req) +
								iov[1].iov_len);
	le32_add_cpu(&req->CreateContextsLength,
			sizeof(struct create_durable_handle_reconnect_v2));
	*num_iovec = num + 1;
	return 0;
}

static int
add_durable_context(struct kvec *iov, unsigned int *num_iovec,
		    struct cifs_open_parms *oparms, bool use_persistent)
{
	struct smb2_create_req *req = iov[0].iov_base;
	unsigned int num = *num_iovec;

	if (use_persistent) {
		if (oparms->reconnect)
			return add_durable_reconnect_v2_context(iov, num_iovec,
								oparms);
		else
			return add_durable_v2_context(iov, num_iovec, oparms);
	}

	if (oparms->reconnect) {
		iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
		/* indicate that we don't need to relock the file */
		oparms->reconnect = false;
	} else
		iov[num].iov_base = create_durable_buf();
	if (iov[num].iov_base == NULL)
		return -ENOMEM;
	iov[num].iov_len = sizeof(struct create_durable);
	if (!req->CreateContextsOffset)
		req->CreateContextsOffset =
			cpu_to_le32(sizeof(struct smb2_create_req) +
								iov[1].iov_len);
	le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
	*num_iovec = num + 1;
	return 0;
}

/* See MS-SMB2 2.2.13.2.7 */
static struct crt_twarp_ctxt *
create_twarp_buf(__u64 timewarp)
{
	struct crt_twarp_ctxt *buf;

	buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
	if (!buf)
		return NULL;

	buf->ccontext.DataOffset = cpu_to_le16(offsetof
					(struct crt_twarp_ctxt, Timestamp));
	buf->ccontext.DataLength = cpu_to_le32(8);
	buf->ccontext.NameOffset = cpu_to_le16(offsetof
				(struct crt_twarp_ctxt, Name));
	buf->ccontext.NameLength = cpu_to_le16(4);
	/* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
	buf->Name[0] = 'T';
	buf->Name[1] = 'W';
	buf->Name[2] = 'r';
	buf->Name[3] = 'p';
	buf->Timestamp = cpu_to_le64(timewarp);
	return buf;
}

/* See MS-SMB2 2.2.13.2.7 */
static int
add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
{
	struct smb2_create_req *req = iov[0].iov_base;
	unsigned int num = *num_iovec;

	iov[num].iov_base = create_twarp_buf(timewarp);
	if (iov[num].iov_base == NULL)
		return -ENOMEM;
	iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
	if (!req->CreateContextsOffset)
		req->CreateContextsOffset = cpu_to_le32(
				sizeof(struct smb2_create_req) +
				iov[num - 1].iov_len);
	le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
	*num_iovec = num + 1;
	return 0;
}

/* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */
static struct crt_sd_ctxt *
create_sd_buf(umode_t mode, unsigned int *len)
{
	struct crt_sd_ctxt *buf;
	struct cifs_ace *pace;
	unsigned int sdlen, acelen;

	*len = roundup(sizeof(struct crt_sd_ctxt) + sizeof(struct cifs_ace), 8);
	buf = kzalloc(*len, GFP_KERNEL);
	if (buf == NULL)
		return buf;

	sdlen = sizeof(struct smb3_sd) + sizeof(struct smb3_acl) +
		 sizeof(struct cifs_ace);

	buf->ccontext.DataOffset = cpu_to_le16(offsetof
					(struct crt_sd_ctxt, sd));
	buf->ccontext.DataLength = cpu_to_le32(sdlen);
	buf->ccontext.NameOffset = cpu_to_le16(offsetof
				(struct crt_sd_ctxt, Name));
	buf->ccontext.NameLength = cpu_to_le16(4);
	/* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */
	buf->Name[0] = 'S';
	buf->Name[1] = 'e';
	buf->Name[2] = 'c';
	buf->Name[3] = 'D';
	buf->sd.Revision = 1;  /* Must be one see MS-DTYP 2.4.6 */
	/*
	 * ACL is "self relative" ie ACL is stored in contiguous block of memory
	 * and "DP" ie the DACL is present
	 */
	buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP);

	/* offset owner, group and Sbz1 and SACL are all zero */
	buf->sd.OffsetDacl = cpu_to_le32(sizeof(struct smb3_sd));
	buf->acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */

	/* create one ACE to hold the mode embedded in reserved special SID */
	pace = (struct cifs_ace *)(sizeof(struct crt_sd_ctxt) + (char *)buf);
	acelen = setup_special_mode_ACE(pace, (__u64)mode);
	buf->acl.AclSize = cpu_to_le16(sizeof(struct cifs_acl) + acelen);
	buf->acl.AceCount = cpu_to_le16(1);
	return buf;
}

static int
add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
{
	struct smb2_create_req *req = iov[0].iov_base;
	unsigned int num = *num_iovec;
	unsigned int len = 0;

	iov[num].iov_base = create_sd_buf(mode, &len);
	if (iov[num].iov_base == NULL)
		return -ENOMEM;
	iov[num].iov_len = len;
	if (!req->CreateContextsOffset)
		req->CreateContextsOffset = cpu_to_le32(
				sizeof(struct smb2_create_req) +
				iov[num - 1].iov_len);
	le32_add_cpu(&req->CreateContextsLength, len);
	*num_iovec = num + 1;
	return 0;
}

static struct crt_query_id_ctxt *
create_query_id_buf(void)
{
	struct crt_query_id_ctxt *buf;

	buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
	if (!buf)
		return NULL;

	buf->ccontext.DataOffset = cpu_to_le16(0);
	buf->ccontext.DataLength = cpu_to_le32(0);
	buf->ccontext.NameOffset = cpu_to_le16(offsetof
				(struct crt_query_id_ctxt, Name));
	buf->ccontext.NameLength = cpu_to_le16(4);
	/* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
	buf->Name[0] = 'Q';
	buf->Name[1] = 'F';
	buf->Name[2] = 'i';
	buf->Name[3] = 'd';
	return buf;
}

/* See MS-SMB2 2.2.13.2.9 */
static int
add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
{
	struct smb2_create_req *req = iov[0].iov_base;
	unsigned int num = *num_iovec;

	iov[num].iov_base = create_query_id_buf();
	if (iov[num].iov_base == NULL)
		return -ENOMEM;
	iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
	if (!req->CreateContextsOffset)
		req->CreateContextsOffset = cpu_to_le32(
				sizeof(struct smb2_create_req) +
				iov[num - 1].iov_len);
	le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_query_id_ctxt));
	*num_iovec = num + 1;
	return 0;
}

static int
alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
			    const char *treename, const __le16 *path)
{
	int treename_len, path_len;
	struct nls_table *cp;
	const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};

	/*
	 * skip leading "\\"
	 */
	treename_len = strlen(treename);
	if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
		return -EINVAL;

	treename += 2;
	treename_len -= 2;

	path_len = UniStrnlen((wchar_t *)path, PATH_MAX);

	/*
	 * make room for one path separator between the treename and
	 * path
	 */
	*out_len = treename_len + 1 + path_len;

	/*
	 * final path needs to be null-terminated UTF16 with a
	 * size aligned to 8
	 */

	*out_size = roundup((*out_len+1)*2, 8);
	*out_path = kzalloc(*out_size, GFP_KERNEL);
	if (!*out_path)
		return -ENOMEM;

	cp = load_nls_default();
	cifs_strtoUTF16(*out_path, treename, treename_len, cp);
	UniStrcat(*out_path, sep);
	UniStrcat(*out_path, path);
	unload_nls(cp);

	return 0;
}

int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
			       umode_t mode, struct cifs_tcon *tcon,
			       const char *full_path,
			       struct cifs_sb_info *cifs_sb)
{
	struct smb_rqst rqst;
	struct smb2_create_req *req;
	struct smb2_create_rsp *rsp = NULL;
	struct cifs_ses *ses = tcon->ses;
	struct kvec iov[3]; /* make sure at least one for each open context */
	struct kvec rsp_iov = {NULL, 0};
	int resp_buftype;
	int uni_path_len;
	__le16 *copy_path = NULL;
	int copy_size;
	int rc = 0;
	unsigned int n_iov = 2;
	__u32 file_attributes = 0;
	char *pc_buf = NULL;
	int flags = 0;
	unsigned int total_len;
	__le16 *utf16_path = NULL;

	cifs_dbg(FYI, "mkdir\n");

	/* resource #1: path allocation */
	utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
	if (!utf16_path)
		return -ENOMEM;

	if (!ses || !(ses->server)) {
		rc = -EIO;
		goto err_free_path;
	}

	/* resource #2: request */
	rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
	if (rc)
		goto err_free_path;


	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	req->ImpersonationLevel = IL_IMPERSONATION;
	req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
	/* File attributes ignored on open (used in create though) */
	req->FileAttributes = cpu_to_le32(file_attributes);
	req->ShareAccess = FILE_SHARE_ALL_LE;
	req->CreateDisposition = cpu_to_le32(FILE_CREATE);
	req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);

	iov[0].iov_base = (char *)req;
	/* -1 since last byte is buf[0] which is sent below (path) */
	iov[0].iov_len = total_len - 1;

	req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));

	/* [MS-SMB2] 2.2.13 NameOffset:
	 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
	 * the SMB2 header, the file name includes a prefix that will
	 * be processed during DFS name normalization as specified in
	 * section 3.3.5.9. Otherwise, the file name is relative to
	 * the share that is identified by the TreeId in the SMB2
	 * header.
	 */
	if (tcon->share_flags & SHI1005_FLAGS_DFS) {
		int name_len;

		req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
		rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
						 &name_len,
						 tcon->treeName, utf16_path);
		if (rc)
			goto err_free_req;

		req->NameLength = cpu_to_le16(name_len * 2);
		uni_path_len = copy_size;
		/* free before overwriting resource */
		kfree(utf16_path);
		utf16_path = copy_path;
	} else {
		uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
		/* MUST set path len (NameLength) to 0 opening root of share */
		req->NameLength = cpu_to_le16(uni_path_len - 2);
		if (uni_path_len % 8 != 0) {
			copy_size = roundup(uni_path_len, 8);
			copy_path = kzalloc(copy_size, GFP_KERNEL);
			if (!copy_path) {
				rc = -ENOMEM;
				goto err_free_req;
			}
			memcpy((char *)copy_path, (const char *)utf16_path,
			       uni_path_len);
			uni_path_len = copy_size;
			/* free before overwriting resource */
			kfree(utf16_path);
			utf16_path = copy_path;
		}
	}

	iov[1].iov_len = uni_path_len;
	iov[1].iov_base = utf16_path;
	req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;

	if (tcon->posix_extensions) {
		/* resource #3: posix buf */
		rc = add_posix_context(iov, &n_iov, mode);
		if (rc)
			goto err_free_req;
		pc_buf = iov[n_iov-1].iov_base;
	}


	memset(&rqst, 0, sizeof(struct smb_rqst));
	rqst.rq_iov = iov;
	rqst.rq_nvec = n_iov;

	/* no need to inc num_remote_opens because we close it just below */
	trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, CREATE_NOT_FILE,
				    FILE_WRITE_ATTRIBUTES);
	/* resource #4: response buffer */
	rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
		trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
					   CREATE_NOT_FILE,
					   FILE_WRITE_ATTRIBUTES, rc);
		goto err_free_rsp_buf;
	}

	rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
	trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
				    ses->Suid, CREATE_NOT_FILE,
				    FILE_WRITE_ATTRIBUTES);

	SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);

	/* Eventually save off posix specific response info and timestaps */

err_free_rsp_buf:
	free_rsp_buf(resp_buftype, rsp);
	kfree(pc_buf);
err_free_req:
	cifs_small_buf_release(req);
err_free_path:
	kfree(utf16_path);
	return rc;
}

int
SMB2_open_init(struct cifs_tcon *tcon, struct smb_rqst *rqst, __u8 *oplock,
	       struct cifs_open_parms *oparms, __le16 *path)
{
	struct TCP_Server_Info *server = tcon->ses->server;
	struct smb2_create_req *req;
	unsigned int n_iov = 2;
	__u32 file_attributes = 0;
	int copy_size;
	int uni_path_len;
	unsigned int total_len;
	struct kvec *iov = rqst->rq_iov;
	__le16 *copy_path;
	int rc;

	rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
	if (rc)
		return rc;

	iov[0].iov_base = (char *)req;
	/* -1 since last byte is buf[0] which is sent below (path) */
	iov[0].iov_len = total_len - 1;

	if (oparms->create_options & CREATE_OPTION_READONLY)
		file_attributes |= ATTR_READONLY;
	if (oparms->create_options & CREATE_OPTION_SPECIAL)
		file_attributes |= ATTR_SYSTEM;

	req->ImpersonationLevel = IL_IMPERSONATION;
	req->DesiredAccess = cpu_to_le32(oparms->desired_access);
	/* File attributes ignored on open (used in create though) */
	req->FileAttributes = cpu_to_le32(file_attributes);
	req->ShareAccess = FILE_SHARE_ALL_LE;

	req->CreateDisposition = cpu_to_le32(oparms->disposition);
	req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
	req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));

	/* [MS-SMB2] 2.2.13 NameOffset:
	 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
	 * the SMB2 header, the file name includes a prefix that will
	 * be processed during DFS name normalization as specified in
	 * section 3.3.5.9. Otherwise, the file name is relative to
	 * the share that is identified by the TreeId in the SMB2
	 * header.
	 */
	if (tcon->share_flags & SHI1005_FLAGS_DFS) {
		int name_len;

		req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
		rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
						 &name_len,
						 tcon->treeName, path);
		if (rc)
			return rc;
		req->NameLength = cpu_to_le16(name_len * 2);
		uni_path_len = copy_size;
		path = copy_path;
	} else {
		uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
		/* MUST set path len (NameLength) to 0 opening root of share */
		req->NameLength = cpu_to_le16(uni_path_len - 2);
		copy_size = uni_path_len;
		if (copy_size % 8 != 0)
			copy_size = roundup(copy_size, 8);
		copy_path = kzalloc(copy_size, GFP_KERNEL);
		if (!copy_path)
			return -ENOMEM;
		memcpy((char *)copy_path, (const char *)path,
		       uni_path_len);
		uni_path_len = copy_size;
		path = copy_path;
	}

	iov[1].iov_len = uni_path_len;
	iov[1].iov_base = path;

	if ((!server->oplocks) || (tcon->no_lease))
		*oplock = SMB2_OPLOCK_LEVEL_NONE;

	if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
	    *oplock == SMB2_OPLOCK_LEVEL_NONE)
		req->RequestedOplockLevel = *oplock;
	else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
		  (oparms->create_options & CREATE_NOT_FILE))
		req->RequestedOplockLevel = *oplock; /* no srv lease support */
	else {
		rc = add_lease_context(server, iov, &n_iov,
				       oparms->fid->lease_key, oplock);
		if (rc)
			return rc;
	}

	if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
		/* need to set Next field of lease context if we request it */
		if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
			struct create_context *ccontext =
			    (struct create_context *)iov[n_iov-1].iov_base;
			ccontext->Next =
				cpu_to_le32(server->vals->create_lease_size);
		}

		rc = add_durable_context(iov, &n_iov, oparms,
					tcon->use_persistent);
		if (rc)
			return rc;
	}

	if (tcon->posix_extensions) {
		if (n_iov > 2) {
			struct create_context *ccontext =
			    (struct create_context *)iov[n_iov-1].iov_base;
			ccontext->Next =
				cpu_to_le32(iov[n_iov-1].iov_len);
		}

		rc = add_posix_context(iov, &n_iov, oparms->mode);
		if (rc)
			return rc;
	}

	if (tcon->snapshot_time) {
		cifs_dbg(FYI, "adding snapshot context\n");
		if (n_iov > 2) {
			struct create_context *ccontext =
			    (struct create_context *)iov[n_iov-1].iov_base;
			ccontext->Next =
				cpu_to_le32(iov[n_iov-1].iov_len);
		}

		rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
		if (rc)
			return rc;
	}

	if ((oparms->disposition != FILE_OPEN) &&
	    (oparms->cifs_sb) &&
	    (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) &&
	    (oparms->mode != ACL_NO_MODE)) {
		if (n_iov > 2) {
			struct create_context *ccontext =
			    (struct create_context *)iov[n_iov-1].iov_base;
			ccontext->Next =
				cpu_to_le32(iov[n_iov-1].iov_len);
		}

		cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);
		rc = add_sd_context(iov, &n_iov, oparms->mode);
		if (rc)
			return rc;
	}

	if (n_iov > 2) {
		struct create_context *ccontext =
			(struct create_context *)iov[n_iov-1].iov_base;
		ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
	}
	add_query_id_context(iov, &n_iov);

	rqst->rq_nvec = n_iov;
	return 0;
}

/* rq_iov[0] is the request and is released by cifs_small_buf_release().
 * All other vectors are freed by kfree().
 */
void
SMB2_open_free(struct smb_rqst *rqst)
{
	int i;

	if (rqst && rqst->rq_iov) {
		cifs_small_buf_release(rqst->rq_iov[0].iov_base);
		for (i = 1; i < rqst->rq_nvec; i++)
			if (rqst->rq_iov[i].iov_base != smb2_padding)
				kfree(rqst->rq_iov[i].iov_base);
	}
}

int
SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
	  __u8 *oplock, struct smb2_file_all_info *buf,
	  struct kvec *err_iov, int *buftype)
{
	struct smb_rqst rqst;
	struct smb2_create_rsp *rsp = NULL;
	struct TCP_Server_Info *server;
	struct cifs_tcon *tcon = oparms->tcon;
	struct cifs_ses *ses = tcon->ses;
	struct kvec iov[SMB2_CREATE_IOV_SIZE];
	struct kvec rsp_iov = {NULL, 0};
	int resp_buftype = CIFS_NO_BUFFER;
	int rc = 0;
	int flags = 0;

	cifs_dbg(FYI, "create/open\n");
	if (ses && (ses->server))
		server = ses->server;
	else
		return -EIO;

	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	memset(&iov, 0, sizeof(iov));
	rqst.rq_iov = iov;
	rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;

	rc = SMB2_open_init(tcon, &rqst, oplock, oparms, path);
	if (rc)
		goto creat_exit;

	trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid,
		oparms->create_options, oparms->desired_access);

	rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
			    &rsp_iov);
	rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;

	if (rc != 0) {
		cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
		if (err_iov && rsp) {
			*err_iov = rsp_iov;
			*buftype = resp_buftype;
			resp_buftype = CIFS_NO_BUFFER;
			rsp = NULL;
		}
		trace_smb3_open_err(xid, tcon->tid, ses->Suid,
				    oparms->create_options, oparms->desired_access, rc);
		if (rc == -EREMCHG) {
			printk_once(KERN_WARNING "server share %s deleted\n",
				    tcon->treeName);
			tcon->need_reconnect = true;
		}
		goto creat_exit;
	} else
		trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
				     ses->Suid, oparms->create_options,
				     oparms->desired_access);

	atomic_inc(&tcon->num_remote_opens);
	oparms->fid->persistent_fid = rsp->PersistentFileId;
	oparms->fid->volatile_fid = rsp->VolatileFileId;
#ifdef CONFIG_CIFS_DEBUG2
	oparms->fid->mid = le64_to_cpu(rsp->sync_hdr.MessageId);
#endif /* CIFS_DEBUG2 */

	if (buf) {
		memcpy(buf, &rsp->CreationTime, 32);
		buf->AllocationSize = rsp->AllocationSize;
		buf->EndOfFile = rsp->EndofFile;
		buf->Attributes = rsp->FileAttributes;
		buf->NumberOfLinks = cpu_to_le32(1);
		buf->DeletePending = 0;
	}


	smb2_parse_contexts(server, rsp, &oparms->fid->epoch,
			    oparms->fid->lease_key, oplock, buf);
creat_exit:
	SMB2_open_free(&rqst);
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}

int
SMB2_ioctl_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
		u64 persistent_fid, u64 volatile_fid, u32 opcode,
		bool is_fsctl, char *in_data, u32 indatalen,
		__u32 max_response_size)
{
	struct smb2_ioctl_req *req;
	struct kvec *iov = rqst->rq_iov;
	unsigned int total_len;
	int rc;
	char *in_data_buf;

	rc = smb2_ioctl_req_init(opcode, tcon, (void **) &req, &total_len);
	if (rc)
		return rc;

	if (indatalen) {
		/*
		 * indatalen is usually small at a couple of bytes max, so
		 * just allocate through generic pool
		 */
		in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
		if (!in_data_buf) {
			cifs_small_buf_release(req);
			return -ENOMEM;
		}
	}

	req->CtlCode = cpu_to_le32(opcode);
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;

	iov[0].iov_base = (char *)req;
	/*
	 * If no input data, the size of ioctl struct in
	 * protocol spec still includes a 1 byte data buffer,
	 * but if input data passed to ioctl, we do not
	 * want to double count this, so we do not send
	 * the dummy one byte of data in iovec[0] if sending
	 * input data (in iovec[1]).
	 */
	if (indatalen) {
		req->InputCount = cpu_to_le32(indatalen);
		/* do not set InputOffset if no input data */
		req->InputOffset =
		       cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
		rqst->rq_nvec = 2;
		iov[0].iov_len = total_len - 1;
		iov[1].iov_base = in_data_buf;
		iov[1].iov_len = indatalen;
	} else {
		rqst->rq_nvec = 1;
		iov[0].iov_len = total_len;
	}

	req->OutputOffset = 0;
	req->OutputCount = 0; /* MBZ */

	/*
	 * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
	 * We Could increase default MaxOutputResponse, but that could require
	 * more credits. Windows typically sets this smaller, but for some
	 * ioctls it may be useful to allow server to send more. No point
	 * limiting what the server can send as long as fits in one credit
	 * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
	 * to increase this limit up in the future.
	 * Note that for snapshot queries that servers like Azure expect that
	 * the first query be minimal size (and just used to get the number/size
	 * of previous versions) so response size must be specified as EXACTLY
	 * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
	 * of eight bytes.  Currently that is the only case where we set max
	 * response size smaller.
	 */
	req->MaxOutputResponse = cpu_to_le32(max_response_size);

	if (is_fsctl)
		req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
	else
		req->Flags = 0;

	/* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
	if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
		req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;

	return 0;
}

void
SMB2_ioctl_free(struct smb_rqst *rqst)
{
	int i;
	if (rqst && rqst->rq_iov) {
		cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
		for (i = 1; i < rqst->rq_nvec; i++)
			if (rqst->rq_iov[i].iov_base != smb2_padding)
				kfree(rqst->rq_iov[i].iov_base);
	}
}


/*
 *	SMB2 IOCTL is used for both IOCTLs and FSCTLs
 */
int
SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
	   u64 volatile_fid, u32 opcode, bool is_fsctl,
	   char *in_data, u32 indatalen, u32 max_out_data_len,
	   char **out_data, u32 *plen /* returned data len */)
{
	struct smb_rqst rqst;
	struct smb2_ioctl_rsp *rsp = NULL;
	struct cifs_ses *ses;
	struct kvec iov[SMB2_IOCTL_IOV_SIZE];
	struct kvec rsp_iov = {NULL, 0};
	int resp_buftype = CIFS_NO_BUFFER;
	int rc = 0;
	int flags = 0;
	struct TCP_Server_Info *server;

	cifs_dbg(FYI, "SMB2 IOCTL\n");

	if (out_data != NULL)
		*out_data = NULL;

	/* zero out returned data len, in case of error */
	if (plen)
		*plen = 0;

	if (tcon)
		ses = tcon->ses;
	else
		return -EIO;

	if (!ses)
		return -EIO;
	server = ses->server;
	if (!server)
		return -EIO;

	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	memset(&iov, 0, sizeof(iov));
	rqst.rq_iov = iov;
	rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;

	rc = SMB2_ioctl_init(tcon, &rqst, persistent_fid, volatile_fid, opcode,
			     is_fsctl, in_data, indatalen, max_out_data_len);
	if (rc)
		goto ioctl_exit;

	rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
			    &rsp_iov);
	rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;

	if (rc != 0)
		trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
				ses->Suid, 0, opcode, rc);

	if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
		cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
		goto ioctl_exit;
	} else if (rc == -EINVAL) {
		if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
		    (opcode != FSCTL_SRV_COPYCHUNK)) {
			cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
			goto ioctl_exit;
		}
	} else if (rc == -E2BIG) {
		if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
			cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
			goto ioctl_exit;
		}
	}

	/* check if caller wants to look at return data or just return rc */
	if ((plen == NULL) || (out_data == NULL))
		goto ioctl_exit;

	*plen = le32_to_cpu(rsp->OutputCount);

	/* We check for obvious errors in the output buffer length and offset */
	if (*plen == 0)
		goto ioctl_exit; /* server returned no data */
	else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
		cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
		*plen = 0;
		rc = -EIO;
		goto ioctl_exit;
	}

	if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
		cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
			le32_to_cpu(rsp->OutputOffset));
		*plen = 0;
		rc = -EIO;
		goto ioctl_exit;
	}

	*out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
			    *plen, GFP_KERNEL);
	if (*out_data == NULL) {
		rc = -ENOMEM;
		goto ioctl_exit;
	}

ioctl_exit:
	SMB2_ioctl_free(&rqst);
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}

/*
 *   Individual callers to ioctl worker function follow
 */

int
SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
		     u64 persistent_fid, u64 volatile_fid)
{
	int rc;
	struct  compress_ioctl fsctl_input;
	char *ret_data = NULL;

	fsctl_input.CompressionState =
			cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);

	rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
			FSCTL_SET_COMPRESSION, true /* is_fsctl */,
			(char *)&fsctl_input /* data input */,
			2 /* in data len */, CIFSMaxBufSize /* max out data */,
			&ret_data /* out data */, NULL);

	cifs_dbg(FYI, "set compression rc %d\n", rc);

	return rc;
}

int
SMB2_close_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
		u64 persistent_fid, u64 volatile_fid, bool query_attrs)
{
	struct smb2_close_req *req;
	struct kvec *iov = rqst->rq_iov;
	unsigned int total_len;
	int rc;

	rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len);
	if (rc)
		return rc;

	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;
	if (query_attrs)
		req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;
	else
		req->Flags = 0;
	iov[0].iov_base = (char *)req;
	iov[0].iov_len = total_len;

	return 0;
}

void
SMB2_close_free(struct smb_rqst *rqst)
{
	if (rqst && rqst->rq_iov)
		cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
}

int
__SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
	     u64 persistent_fid, u64 volatile_fid,
	     struct smb2_file_network_open_info *pbuf)
{
	struct smb_rqst rqst;
	struct smb2_close_rsp *rsp = NULL;
	struct cifs_ses *ses = tcon->ses;
	struct kvec iov[1];
	struct kvec rsp_iov;
	int resp_buftype = CIFS_NO_BUFFER;
	int rc = 0;
	int flags = 0;
	bool query_attrs = false;

	cifs_dbg(FYI, "Close\n");

	if (!ses || !(ses->server))
		return -EIO;

	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	memset(&iov, 0, sizeof(iov));
	rqst.rq_iov = iov;
	rqst.rq_nvec = 1;

	/* check if need to ask server to return timestamps in close response */
	if (pbuf)
		query_attrs = true;

	trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
	rc = SMB2_close_init(tcon, &rqst, persistent_fid, volatile_fid,
			     query_attrs);
	if (rc)
		goto close_exit;

	rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
	rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;

	if (rc != 0) {
		cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
		trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
				     rc);
		goto close_exit;
	} else {
		trace_smb3_close_done(xid, persistent_fid, tcon->tid,
				      ses->Suid);
		/*
		 * Note that have to subtract 4 since struct network_open_info
		 * has a final 4 byte pad that close response does not have
		 */
		if (pbuf)
			memcpy(pbuf, (char *)&rsp->CreationTime, sizeof(*pbuf) - 4);
	}

	atomic_dec(&tcon->num_remote_opens);
close_exit:
	SMB2_close_free(&rqst);
	free_rsp_buf(resp_buftype, rsp);

	/* retry close in a worker thread if this one is interrupted */
	if (rc == -EINTR) {
		int tmp_rc;

		tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,
						     volatile_fid);
		if (tmp_rc)
			cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",
				 persistent_fid, tmp_rc);
	}
	return rc;
}

int
SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
		u64 persistent_fid, u64 volatile_fid)
{
	return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL);
}

int
smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
		  struct kvec *iov, unsigned int min_buf_size)
{
	unsigned int smb_len = iov->iov_len;
	char *end_of_smb = smb_len + (char *)iov->iov_base;
	char *begin_of_buf = offset + (char *)iov->iov_base;
	char *end_of_buf = begin_of_buf + buffer_length;


	if (buffer_length < min_buf_size) {
		cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
			 buffer_length, min_buf_size);
		return -EINVAL;
	}

	/* check if beyond RFC1001 maximum length */
	if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
		cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
			 buffer_length, smb_len);
		return -EINVAL;
	}

	if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
		cifs_dbg(VFS, "illegal server response, bad offset to data\n");
		return -EINVAL;
	}

	return 0;
}

/*
 * If SMB buffer fields are valid, copy into temporary buffer to hold result.
 * Caller must free buffer.
 */
int
smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
			   struct kvec *iov, unsigned int minbufsize,
			   char *data)
{
	char *begin_of_buf = offset + (char *)iov->iov_base;
	int rc;

	if (!data)
		return -EINVAL;

	rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
	if (rc)
		return rc;

	memcpy(data, begin_of_buf, buffer_length);

	return 0;
}

int
SMB2_query_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
		     u64 persistent_fid, u64 volatile_fid,
		     u8 info_class, u8 info_type, u32 additional_info,
		     size_t output_len, size_t input_len, void *input)
{
	struct smb2_query_info_req *req;
	struct kvec *iov = rqst->rq_iov;
	unsigned int total_len;
	int rc;

	rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
			     &total_len);
	if (rc)
		return rc;

	req->InfoType = info_type;
	req->FileInfoClass = info_class;
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;
	req->AdditionalInformation = cpu_to_le32(additional_info);

	req->OutputBufferLength = cpu_to_le32(output_len);
	if (input_len) {
		req->InputBufferLength = cpu_to_le32(input_len);
		/* total_len for smb query request never close to le16 max */
		req->InputBufferOffset = cpu_to_le16(total_len - 1);
		memcpy(req->Buffer, input, input_len);
	}

	iov[0].iov_base = (char *)req;
	/* 1 for Buffer */
	iov[0].iov_len = total_len - 1 + input_len;
	return 0;
}

void
SMB2_query_info_free(struct smb_rqst *rqst)
{
	if (rqst && rqst->rq_iov)
		cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
}

static int
query_info(const unsigned int xid, struct cifs_tcon *tcon,
	   u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
	   u32 additional_info, size_t output_len, size_t min_len, void **data,
		u32 *dlen)
{
	struct smb_rqst rqst;
	struct smb2_query_info_rsp *rsp = NULL;
	struct kvec iov[1];
	struct kvec rsp_iov;
	int rc = 0;
	int resp_buftype = CIFS_NO_BUFFER;
	struct cifs_ses *ses = tcon->ses;
	struct TCP_Server_Info *server;
	int flags = 0;
	bool allocated = false;

	cifs_dbg(FYI, "Query Info\n");

	if (!ses)
		return -EIO;
	server = ses->server;
	if (!server)
		return -EIO;

	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	memset(&iov, 0, sizeof(iov));
	rqst.rq_iov = iov;
	rqst.rq_nvec = 1;

	rc = SMB2_query_info_init(tcon, &rqst, persistent_fid, volatile_fid,
				  info_class, info_type, additional_info,
				  output_len, 0, NULL);
	if (rc)
		goto qinf_exit;

	trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
				    ses->Suid, info_class, (__u32)info_type);

	rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;

	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
		trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
				ses->Suid, info_class, (__u32)info_type, rc);
		goto qinf_exit;
	}

	trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
				ses->Suid, info_class, (__u32)info_type);

	if (dlen) {
		*dlen = le32_to_cpu(rsp->OutputBufferLength);
		if (!*data) {
			*data = kmalloc(*dlen, GFP_KERNEL);
			if (!*data) {
				cifs_tcon_dbg(VFS,
					"Error %d allocating memory for acl\n",
					rc);
				*dlen = 0;
				rc = -ENOMEM;
				goto qinf_exit;
			}
			allocated = true;
		}
	}

	rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
					le32_to_cpu(rsp->OutputBufferLength),
					&rsp_iov, min_len, *data);
	if (rc && allocated) {
		kfree(*data);
		*data = NULL;
		*dlen = 0;
	}

qinf_exit:
	SMB2_query_info_free(&rqst);
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}

int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
	u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
{
	return query_info(xid, tcon, persistent_fid, volatile_fid,
			  FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
			  sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
			  sizeof(struct smb2_file_all_info), (void **)&data,
			  NULL);
}

int
SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
		u64 persistent_fid, u64 volatile_fid,
		void **data, u32 *plen)
{
	__u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
	*plen = 0;

	return query_info(xid, tcon, persistent_fid, volatile_fid,
			  0, SMB2_O_INFO_SECURITY, additional_info,
			  SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
}

int
SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
		 u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
{
	return query_info(xid, tcon, persistent_fid, volatile_fid,
			  FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
			  sizeof(struct smb2_file_internal_info),
			  sizeof(struct smb2_file_internal_info),
			  (void **)&uniqueid, NULL);
}

/*
 * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
 * See MS-SMB2 2.2.35 and 2.2.36
 */

static int
SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
		struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid,
		u32 completion_filter, bool watch_tree)
{
	struct smb2_change_notify_req *req;
	struct kvec *iov = rqst->rq_iov;
	unsigned int total_len;
	int rc;

	rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, (void **) &req, &total_len);
	if (rc)
		return rc;

	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;
	req->OutputBufferLength =
		cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE);
	req->CompletionFilter = cpu_to_le32(completion_filter);
	if (watch_tree)
		req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
	else
		req->Flags = 0;

	iov[0].iov_base = (char *)req;
	iov[0].iov_len = total_len;

	return 0;
}

int
SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
		u64 persistent_fid, u64 volatile_fid, bool watch_tree,
		u32 completion_filter)
{
	struct cifs_ses *ses = tcon->ses;
	struct smb_rqst rqst;
	struct kvec iov[1];
	struct kvec rsp_iov = {NULL, 0};
	int resp_buftype = CIFS_NO_BUFFER;
	int flags = 0;
	int rc = 0;

	cifs_dbg(FYI, "change notify\n");
	if (!ses || !(ses->server))
		return -EIO;

	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	memset(&iov, 0, sizeof(iov));
	rqst.rq_iov = iov;
	rqst.rq_nvec = 1;

	rc = SMB2_notify_init(xid, &rqst, tcon, persistent_fid, volatile_fid,
			      completion_filter, watch_tree);
	if (rc)
		goto cnotify_exit;

	trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
				(u8)watch_tree, completion_filter);
	rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);

	if (rc != 0) {
		cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
		trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
				(u8)watch_tree, completion_filter, rc);
	} else
		trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
				ses->Suid, (u8)watch_tree, completion_filter);

 cnotify_exit:
	if (rqst.rq_iov)
		cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
	return rc;
}



/*
 * This is a no-op for now. We're not really interested in the reply, but
 * rather in the fact that the server sent one and that server->lstrp
 * gets updated.
 *
 * FIXME: maybe we should consider checking that the reply matches request?
 */
static void
smb2_echo_callback(struct mid_q_entry *mid)
{
	struct TCP_Server_Info *server = mid->callback_data;
	struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
	struct cifs_credits credits = { .value = 0, .instance = 0 };

	if (mid->mid_state == MID_RESPONSE_RECEIVED
	    || mid->mid_state == MID_RESPONSE_MALFORMED) {
		credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
		credits.instance = server->reconnect_instance;
	}

	DeleteMidQEntry(mid);
	add_credits(server, &credits, CIFS_ECHO_OP);
}

void smb2_reconnect_server(struct work_struct *work)
{
	struct TCP_Server_Info *server = container_of(work,
					struct TCP_Server_Info, reconnect.work);
	struct cifs_ses *ses;
	struct cifs_tcon *tcon, *tcon2;
	struct list_head tmp_list;
	int tcon_exist = false;
	int rc;
	int resched = false;


	/* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
	mutex_lock(&server->reconnect_mutex);

	INIT_LIST_HEAD(&tmp_list);
	cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");

	spin_lock(&cifs_tcp_ses_lock);
	list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
		list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
			if (tcon->need_reconnect || tcon->need_reopen_files) {
				tcon->tc_count++;
				list_add_tail(&tcon->rlist, &tmp_list);
				tcon_exist = true;
			}
		}
		/*
		 * IPC has the same lifetime as its session and uses its
		 * refcount.
		 */
		if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
			list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
			tcon_exist = true;
			ses->ses_count++;
		}
	}
	/*
	 * Get the reference to server struct to be sure that the last call of
	 * cifs_put_tcon() in the loop below won't release the server pointer.
	 */
	if (tcon_exist)
		server->srv_count++;

	spin_unlock(&cifs_tcp_ses_lock);

	list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
		rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
		if (!rc)
			cifs_reopen_persistent_handles(tcon);
		else
			resched = true;
		list_del_init(&tcon->rlist);
		if (tcon->ipc)
			cifs_put_smb_ses(tcon->ses);
		else
			cifs_put_tcon(tcon);
	}

	cifs_dbg(FYI, "Reconnecting tcons finished\n");
	if (resched)
		queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
	mutex_unlock(&server->reconnect_mutex);

	/* now we can safely release srv struct */
	if (tcon_exist)
		cifs_put_tcp_session(server, 1);
}

int
SMB2_echo(struct TCP_Server_Info *server)
{
	struct smb2_echo_req *req;
	int rc = 0;
	struct kvec iov[1];
	struct smb_rqst rqst = { .rq_iov = iov,
				 .rq_nvec = 1 };
	unsigned int total_len;

	cifs_dbg(FYI, "In echo request\n");

	if (server->tcpStatus == CifsNeedNegotiate) {
		/* No need to send echo on newly established connections */
		queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
		return rc;
	}

	rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len);
	if (rc)
		return rc;

	req->sync_hdr.CreditRequest = cpu_to_le16(1);

	iov[0].iov_len = total_len;
	iov[0].iov_base = (char *)req;

	rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
			     server, CIFS_ECHO_OP, NULL);
	if (rc)
		cifs_dbg(FYI, "Echo request failed: %d\n", rc);

	cifs_small_buf_release(req);
	return rc;
}

void
SMB2_flush_free(struct smb_rqst *rqst)
{
	if (rqst && rqst->rq_iov)
		cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
}

int
SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
		struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid)
{
	struct smb2_flush_req *req;
	struct kvec *iov = rqst->rq_iov;
	unsigned int total_len;
	int rc;

	rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len);
	if (rc)
		return rc;

	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;

	iov[0].iov_base = (char *)req;
	iov[0].iov_len = total_len;

	return 0;
}

int
SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
	   u64 volatile_fid)
{
	struct cifs_ses *ses = tcon->ses;
	struct smb_rqst rqst;
	struct kvec iov[1];
	struct kvec rsp_iov = {NULL, 0};
	int resp_buftype = CIFS_NO_BUFFER;
	int flags = 0;
	int rc = 0;

	cifs_dbg(FYI, "flush\n");
	if (!ses || !(ses->server))
		return -EIO;

	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	memset(&iov, 0, sizeof(iov));
	rqst.rq_iov = iov;
	rqst.rq_nvec = 1;

	rc = SMB2_flush_init(xid, &rqst, tcon, persistent_fid, volatile_fid);
	if (rc)
		goto flush_exit;

	trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
	rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);

	if (rc != 0) {
		cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
		trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
				     rc);
	} else
		trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
				      ses->Suid);

 flush_exit:
	SMB2_flush_free(&rqst);
	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
	return rc;
}

/*
 * To form a chain of read requests, any read requests after the first should
 * have the end_of_chain boolean set to true.
 */
static int
smb2_new_read_req(void **buf, unsigned int *total_len,
	struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
	unsigned int remaining_bytes, int request_type)
{
	int rc = -EACCES;
	struct smb2_read_plain_req *req = NULL;
	struct smb2_sync_hdr *shdr;
	struct TCP_Server_Info *server;

	rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
				 total_len);
	if (rc)
		return rc;

	server = io_parms->tcon->ses->server;
	if (server == NULL)
		return -ECONNABORTED;

	shdr = &req->sync_hdr;
	shdr->ProcessId = cpu_to_le32(io_parms->pid);

	req->PersistentFileId = io_parms->persistent_fid;
	req->VolatileFileId = io_parms->volatile_fid;
	req->ReadChannelInfoOffset = 0; /* reserved */
	req->ReadChannelInfoLength = 0; /* reserved */
	req->Channel = 0; /* reserved */
	req->MinimumCount = 0;
	req->Length = cpu_to_le32(io_parms->length);
	req->Offset = cpu_to_le64(io_parms->offset);

	trace_smb3_read_enter(0 /* xid */,
			io_parms->persistent_fid,
			io_parms->tcon->tid, io_parms->tcon->ses->Suid,
			io_parms->offset, io_parms->length);
#ifdef CONFIG_CIFS_SMB_DIRECT
	/*
	 * If we want to do a RDMA write, fill in and append
	 * smbd_buffer_descriptor_v1 to the end of read request
	 */
	if (server->rdma && rdata && !server->sign &&
		rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {

		struct smbd_buffer_descriptor_v1 *v1;
		bool need_invalidate =
			io_parms->tcon->ses->server->dialect == SMB30_PROT_ID;

		rdata->mr = smbd_register_mr(
				server->smbd_conn, rdata->pages,
				rdata->nr_pages, rdata->page_offset,
				rdata->tailsz, true, need_invalidate);
		if (!rdata->mr)
			return -EAGAIN;

		req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
		if (need_invalidate)
			req->Channel = SMB2_CHANNEL_RDMA_V1;
		req->ReadChannelInfoOffset =
			cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
		req->ReadChannelInfoLength =
			cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
		v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
		v1->offset = cpu_to_le64(rdata->mr->mr->iova);
		v1->token = cpu_to_le32(rdata->mr->mr->rkey);
		v1->length = cpu_to_le32(rdata->mr->mr->length);

		*total_len += sizeof(*v1) - 1;
	}
#endif
	if (request_type & CHAINED_REQUEST) {
		if (!(request_type & END_OF_CHAIN)) {
			/* next 8-byte aligned request */
			*total_len = DIV_ROUND_UP(*total_len, 8) * 8;
			shdr->NextCommand = cpu_to_le32(*total_len);
		} else /* END_OF_CHAIN */
			shdr->NextCommand = 0;
		if (request_type & RELATED_REQUEST) {
			shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
			/*
			 * Related requests use info from previous read request
			 * in chain.
			 */
			shdr->SessionId = 0xFFFFFFFF;
			shdr->TreeId = 0xFFFFFFFF;
			req->PersistentFileId = 0xFFFFFFFF;
			req->VolatileFileId = 0xFFFFFFFF;
		}
	}
	if (remaining_bytes > io_parms->length)
		req->RemainingBytes = cpu_to_le32(remaining_bytes);
	else
		req->RemainingBytes = 0;

	*buf = req;
	return rc;
}

static void
smb2_readv_callback(struct mid_q_entry *mid)
{
	struct cifs_readdata *rdata = mid->callback_data;
	struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
	struct TCP_Server_Info *server = tcon->ses->server;
	struct smb2_sync_hdr *shdr =
				(struct smb2_sync_hdr *)rdata->iov[0].iov_base;
	struct cifs_credits credits = { .value = 0, .instance = 0 };
	struct smb_rqst rqst = { .rq_iov = &rdata->iov[1],
				 .rq_nvec = 1,
				 .rq_pages = rdata->pages,
				 .rq_offset = rdata->page_offset,
				 .rq_npages = rdata->nr_pages,
				 .rq_pagesz = rdata->pagesz,
				 .rq_tailsz = rdata->tailsz };

	cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
		 __func__, mid->mid, mid->mid_state, rdata->result,
		 rdata->bytes);

	switch (mid->mid_state) {
	case MID_RESPONSE_RECEIVED:
		credits.value = le16_to_cpu(shdr->CreditRequest);
		credits.instance = server->reconnect_instance;
		/* result already set, check signature */
		if (server->sign && !mid->decrypted) {
			int rc;

			rc = smb2_verify_signature(&rqst, server);
			if (rc)
				cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
					 rc);
		}
		/* FIXME: should this be counted toward the initiating task? */
		task_io_account_read(rdata->got_bytes);
		cifs_stats_bytes_read(tcon, rdata->got_bytes);
		break;
	case MID_REQUEST_SUBMITTED:
	case MID_RETRY_NEEDED:
		rdata->result = -EAGAIN;
		if (server->sign && rdata->got_bytes)
			/* reset bytes number since we can not check a sign */
			rdata->got_bytes = 0;
		/* FIXME: should this be counted toward the initiating task? */
		task_io_account_read(rdata->got_bytes);
		cifs_stats_bytes_read(tcon, rdata->got_bytes);
		break;
	case MID_RESPONSE_MALFORMED:
		credits.value = le16_to_cpu(shdr->CreditRequest);
		credits.instance = server->reconnect_instance;
		/* fall through */
	default:
		rdata->result = -EIO;
	}
#ifdef CONFIG_CIFS_SMB_DIRECT
	/*
	 * If this rdata has a memmory registered, the MR can be freed
	 * MR needs to be freed as soon as I/O finishes to prevent deadlock
	 * because they have limited number and are used for future I/Os
	 */
	if (rdata->mr) {
		smbd_deregister_mr(rdata->mr);
		rdata->mr = NULL;
	}
#endif
	if (rdata->result && rdata->result != -ENODATA) {
		cifs_stats_fail_inc(tcon, SMB2_READ_HE);
		trace_smb3_read_err(0 /* xid */,
				    rdata->cfile->fid.persistent_fid,
				    tcon->tid, tcon->ses->Suid, rdata->offset,
				    rdata->bytes, rdata->result);
	} else
		trace_smb3_read_done(0 /* xid */,
				     rdata->cfile->fid.persistent_fid,
				     tcon->tid, tcon->ses->Suid,
				     rdata->offset, rdata->got_bytes);

	queue_work(cifsiod_wq, &rdata->work);
	DeleteMidQEntry(mid);
	add_credits(server, &credits, 0);
}

/* smb2_async_readv - send an async read, and set up mid to handle result */
int
smb2_async_readv(struct cifs_readdata *rdata)
{
	int rc, flags = 0;
	char *buf;
	struct smb2_sync_hdr *shdr;
	struct cifs_io_parms io_parms;
	struct smb_rqst rqst = { .rq_iov = rdata->iov,
				 .rq_nvec = 1 };
	struct TCP_Server_Info *server;
	unsigned int total_len;

	cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
		 __func__, rdata->offset, rdata->bytes);

	io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
	io_parms.offset = rdata->offset;
	io_parms.length = rdata->bytes;
	io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
	io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
	io_parms.pid = rdata->pid;

	server = io_parms.tcon->ses->server;

	rc = smb2_new_read_req(
		(void **) &buf, &total_len, &io_parms, rdata, 0, 0);
	if (rc)
		return rc;

	if (smb3_encryption_required(io_parms.tcon))
		flags |= CIFS_TRANSFORM_REQ;

	rdata->iov[0].iov_base = buf;
	rdata->iov[0].iov_len = total_len;

	shdr = (struct smb2_sync_hdr *)buf;

	if (rdata->credits.value > 0) {
		shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
						SMB2_MAX_BUFFER_SIZE));
		shdr->CreditRequest =
			cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);

		rc = adjust_credits(server, &rdata->credits, rdata->bytes);
		if (rc)
			goto async_readv_out;

		flags |= CIFS_HAS_CREDITS;
	}

	kref_get(&rdata->refcount);
	rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
			     cifs_readv_receive, smb2_readv_callback,
			     smb3_handle_read_data, rdata, flags,
			     &rdata->credits);
	if (rc) {
		kref_put(&rdata->refcount, cifs_readdata_release);
		cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
		trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
				    io_parms.tcon->tid,
				    io_parms.tcon->ses->Suid,
				    io_parms.offset, io_parms.length, rc);
	}

async_readv_out:
	cifs_small_buf_release(buf);
	return rc;
}

int
SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
	  unsigned int *nbytes, char **buf, int *buf_type)
{
	struct smb_rqst rqst;
	int resp_buftype, rc;
	struct smb2_read_plain_req *req = NULL;
	struct smb2_read_rsp *rsp = NULL;
	struct kvec iov[1];
	struct kvec rsp_iov;
	unsigned int total_len;
	int flags = CIFS_LOG_ERROR;
	struct cifs_ses *ses = io_parms->tcon->ses;

	*nbytes = 0;
	rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
	if (rc)
		return rc;

	if (smb3_encryption_required(io_parms->tcon))
		flags |= CIFS_TRANSFORM_REQ;

	iov[0].iov_base = (char *)req;
	iov[0].iov_len = total_len;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	rqst.rq_iov = iov;
	rqst.rq_nvec = 1;

	rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
	rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;

	if (rc) {
		if (rc != -ENODATA) {
			cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
			cifs_dbg(VFS, "Send error in read = %d\n", rc);
			trace_smb3_read_err(xid, req->PersistentFileId,
					    io_parms->tcon->tid, ses->Suid,
					    io_parms->offset, io_parms->length,
					    rc);
		} else
			trace_smb3_read_done(xid, req->PersistentFileId,
				    io_parms->tcon->tid, ses->Suid,
				    io_parms->offset, 0);
		free_rsp_buf(resp_buftype, rsp_iov.iov_base);
		cifs_small_buf_release(req);
		return rc == -ENODATA ? 0 : rc;
	} else
		trace_smb3_read_done(xid, req->PersistentFileId,
				    io_parms->tcon->tid, ses->Suid,
				    io_parms->offset, io_parms->length);

	cifs_small_buf_release(req);

	*nbytes = le32_to_cpu(rsp->DataLength);
	if ((*nbytes > CIFS_MAX_MSGSIZE) ||
	    (*nbytes > io_parms->length)) {
		cifs_dbg(FYI, "bad length %d for count %d\n",
			 *nbytes, io_parms->length);
		rc = -EIO;
		*nbytes = 0;
	}

	if (*buf) {
		memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
		free_rsp_buf(resp_buftype, rsp_iov.iov_base);
	} else if (resp_buftype != CIFS_NO_BUFFER) {
		*buf = rsp_iov.iov_base;
		if (resp_buftype == CIFS_SMALL_BUFFER)
			*buf_type = CIFS_SMALL_BUFFER;
		else if (resp_buftype == CIFS_LARGE_BUFFER)
			*buf_type = CIFS_LARGE_BUFFER;
	}
	return rc;
}

/*
 * Check the mid_state and signature on received buffer (if any), and queue the
 * workqueue completion task.
 */
static void
smb2_writev_callback(struct mid_q_entry *mid)
{
	struct cifs_writedata *wdata = mid->callback_data;
	struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
	struct TCP_Server_Info *server = tcon->ses->server;
	unsigned int written;
	struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
	struct cifs_credits credits = { .value = 0, .instance = 0 };

	switch (mid->mid_state) {
	case MID_RESPONSE_RECEIVED:
		credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
		credits.instance = server->reconnect_instance;
		wdata->result = smb2_check_receive(mid, server, 0);
		if (wdata->result != 0)
			break;

		written = le32_to_cpu(rsp->DataLength);
		/*
		 * Mask off high 16 bits when bytes written as returned
		 * by the server is greater than bytes requested by the
		 * client. OS/2 servers are known to set incorrect
		 * CountHigh values.
		 */
		if (written > wdata->bytes)
			written &= 0xFFFF;

		if (written < wdata->bytes)
			wdata->result = -ENOSPC;
		else
			wdata->bytes = written;
		break;
	case MID_REQUEST_SUBMITTED:
	case MID_RETRY_NEEDED:
		wdata->result = -EAGAIN;
		break;
	case MID_RESPONSE_MALFORMED:
		credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
		credits.instance = server->reconnect_instance;
		/* fall through */
	default:
		wdata->result = -EIO;
		break;
	}
#ifdef CONFIG_CIFS_SMB_DIRECT
	/*
	 * If this wdata has a memory registered, the MR can be freed
	 * The number of MRs available is limited, it's important to recover
	 * used MR as soon as I/O is finished. Hold MR longer in the later
	 * I/O process can possibly result in I/O deadlock due to lack of MR
	 * to send request on I/O retry
	 */
	if (wdata->mr) {
		smbd_deregister_mr(wdata->mr);
		wdata->mr = NULL;
	}
#endif
	if (wdata->result) {
		cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
		trace_smb3_write_err(0 /* no xid */,
				     wdata->cfile->fid.persistent_fid,
				     tcon->tid, tcon->ses->Suid, wdata->offset,
				     wdata->bytes, wdata->result);
	} else
		trace_smb3_write_done(0 /* no xid */,
				      wdata->cfile->fid.persistent_fid,
				      tcon->tid, tcon->ses->Suid,
				      wdata->offset, wdata->bytes);

	queue_work(cifsiod_wq, &wdata->work);
	DeleteMidQEntry(mid);
	add_credits(server, &credits, 0);
}

/* smb2_async_writev - send an async write, and set up mid to handle result */
int
smb2_async_writev(struct cifs_writedata *wdata,
		  void (*release)(struct kref *kref))
{
	int rc = -EACCES, flags = 0;
	struct smb2_write_req *req = NULL;
	struct smb2_sync_hdr *shdr;
	struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
	struct TCP_Server_Info *server = tcon->ses->server;
	struct kvec iov[1];
	struct smb_rqst rqst = { };
	unsigned int total_len;

	rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len);
	if (rc)
		return rc;

	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	shdr = (struct smb2_sync_hdr *)req;
	shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);

	req->PersistentFileId = wdata->cfile->fid.persistent_fid;
	req->VolatileFileId = wdata->cfile->fid.volatile_fid;
	req->WriteChannelInfoOffset = 0;
	req->WriteChannelInfoLength = 0;
	req->Channel = 0;
	req->Offset = cpu_to_le64(wdata->offset);
	req->DataOffset = cpu_to_le16(
				offsetof(struct smb2_write_req, Buffer));
	req->RemainingBytes = 0;

	trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid,
		tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes);
#ifdef CONFIG_CIFS_SMB_DIRECT
	/*
	 * If we want to do a server RDMA read, fill in and append
	 * smbd_buffer_descriptor_v1 to the end of write request
	 */
	if (server->rdma && !server->sign && wdata->bytes >=
		server->smbd_conn->rdma_readwrite_threshold) {

		struct smbd_buffer_descriptor_v1 *v1;
		bool need_invalidate = server->dialect == SMB30_PROT_ID;

		wdata->mr = smbd_register_mr(
				server->smbd_conn, wdata->pages,
				wdata->nr_pages, wdata->page_offset,
				wdata->tailsz, false, need_invalidate);
		if (!wdata->mr) {
			rc = -EAGAIN;
			goto async_writev_out;
		}
		req->Length = 0;
		req->DataOffset = 0;
		if (wdata->nr_pages > 1)
			req->RemainingBytes =
				cpu_to_le32(
					(wdata->nr_pages - 1) * wdata->pagesz -
					wdata->page_offset + wdata->tailsz
				);
		else
			req->RemainingBytes = cpu_to_le32(wdata->tailsz);
		req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
		if (need_invalidate)
			req->Channel = SMB2_CHANNEL_RDMA_V1;
		req->WriteChannelInfoOffset =
			cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
		req->WriteChannelInfoLength =
			cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
		v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
		v1->offset = cpu_to_le64(wdata->mr->mr->iova);
		v1->token = cpu_to_le32(wdata->mr->mr->rkey);
		v1->length = cpu_to_le32(wdata->mr->mr->length);
	}
#endif
	iov[0].iov_len = total_len - 1;
	iov[0].iov_base = (char *)req;

	rqst.rq_iov = iov;
	rqst.rq_nvec = 1;
	rqst.rq_pages = wdata->pages;
	rqst.rq_offset = wdata->page_offset;
	rqst.rq_npages = wdata->nr_pages;
	rqst.rq_pagesz = wdata->pagesz;
	rqst.rq_tailsz = wdata->tailsz;
#ifdef CONFIG_CIFS_SMB_DIRECT
	if (wdata->mr) {
		iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
		rqst.rq_npages = 0;
	}
#endif
	cifs_dbg(FYI, "async write at %llu %u bytes\n",
		 wdata->offset, wdata->bytes);

#ifdef CONFIG_CIFS_SMB_DIRECT
	/* For RDMA read, I/O size is in RemainingBytes not in Length */
	if (!wdata->mr)
		req->Length = cpu_to_le32(wdata->bytes);
#else
	req->Length = cpu_to_le32(wdata->bytes);
#endif

	if (wdata->credits.value > 0) {
		shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
						    SMB2_MAX_BUFFER_SIZE));
		shdr->CreditRequest =
			cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);

		rc = adjust_credits(server, &wdata->credits, wdata->bytes);
		if (rc)
			goto async_writev_out;

		flags |= CIFS_HAS_CREDITS;
	}

	kref_get(&wdata->refcount);
	rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
			     wdata, flags, &wdata->credits);

	if (rc) {
		trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
				     tcon->tid, tcon->ses->Suid, wdata->offset,
				     wdata->bytes, rc);
		kref_put(&wdata->refcount, release);
		cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
	}

async_writev_out:
	cifs_small_buf_release(req);
	return rc;
}

/*
 * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
 * The length field from io_parms must be at least 1 and indicates a number of
 * elements with data to write that begins with position 1 in iov array. All
 * data length is specified by count.
 */
int
SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
	   unsigned int *nbytes, struct kvec *iov, int n_vec)
{
	struct smb_rqst rqst;
	int rc = 0;
	struct smb2_write_req *req = NULL;
	struct smb2_write_rsp *rsp = NULL;
	int resp_buftype;
	struct kvec rsp_iov;
	int flags = 0;
	unsigned int total_len;

	*nbytes = 0;

	if (n_vec < 1)
		return rc;

	rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, (void **) &req,
			     &total_len);
	if (rc)
		return rc;

	if (io_parms->tcon->ses->server == NULL)
		return -ECONNABORTED;

	if (smb3_encryption_required(io_parms->tcon))
		flags |= CIFS_TRANSFORM_REQ;

	req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);

	req->PersistentFileId = io_parms->persistent_fid;
	req->VolatileFileId = io_parms->volatile_fid;
	req->WriteChannelInfoOffset = 0;
	req->WriteChannelInfoLength = 0;
	req->Channel = 0;
	req->Length = cpu_to_le32(io_parms->length);
	req->Offset = cpu_to_le64(io_parms->offset);
	req->DataOffset = cpu_to_le16(
				offsetof(struct smb2_write_req, Buffer));
	req->RemainingBytes = 0;

	trace_smb3_write_enter(xid, io_parms->persistent_fid,
		io_parms->tcon->tid, io_parms->tcon->ses->Suid,
		io_parms->offset, io_parms->length);

	iov[0].iov_base = (char *)req;
	/* 1 for Buffer */
	iov[0].iov_len = total_len - 1;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	rqst.rq_iov = iov;
	rqst.rq_nvec = n_vec + 1;

	rc = cifs_send_recv(xid, io_parms->tcon->ses, &rqst,
			    &resp_buftype, flags, &rsp_iov);
	rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;

	if (rc) {
		trace_smb3_write_err(xid, req->PersistentFileId,
				     io_parms->tcon->tid,
				     io_parms->tcon->ses->Suid,
				     io_parms->offset, io_parms->length, rc);
		cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
		cifs_dbg(VFS, "Send error in write = %d\n", rc);
	} else {
		*nbytes = le32_to_cpu(rsp->DataLength);
		trace_smb3_write_done(xid, req->PersistentFileId,
				     io_parms->tcon->tid,
				     io_parms->tcon->ses->Suid,
				     io_parms->offset, *nbytes);
	}

	cifs_small_buf_release(req);
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}

static unsigned int
num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
{
	int len;
	unsigned int entrycount = 0;
	unsigned int next_offset = 0;
	char *entryptr;
	FILE_DIRECTORY_INFO *dir_info;

	if (bufstart == NULL)
		return 0;

	entryptr = bufstart;

	while (1) {
		if (entryptr + next_offset < entryptr ||
		    entryptr + next_offset > end_of_buf ||
		    entryptr + next_offset + size > end_of_buf) {
			cifs_dbg(VFS, "malformed search entry would overflow\n");
			break;
		}

		entryptr = entryptr + next_offset;
		dir_info = (FILE_DIRECTORY_INFO *)entryptr;

		len = le32_to_cpu(dir_info->FileNameLength);
		if (entryptr + len < entryptr ||
		    entryptr + len > end_of_buf ||
		    entryptr + len + size > end_of_buf) {
			cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
				 end_of_buf);
			break;
		}

		*lastentry = entryptr;
		entrycount++;

		next_offset = le32_to_cpu(dir_info->NextEntryOffset);
		if (!next_offset)
			break;
	}

	return entrycount;
}

/*
 * Readdir/FindFirst
 */
int SMB2_query_directory_init(const unsigned int xid,
			      struct cifs_tcon *tcon, struct smb_rqst *rqst,
			      u64 persistent_fid, u64 volatile_fid,
			      int index, int info_level)
{
	struct TCP_Server_Info *server = tcon->ses->server;
	struct smb2_query_directory_req *req;
	unsigned char *bufptr;
	__le16 asteriks = cpu_to_le16('*');
	unsigned int output_size = CIFSMaxBufSize -
		MAX_SMB2_CREATE_RESPONSE_SIZE -
		MAX_SMB2_CLOSE_RESPONSE_SIZE;
	unsigned int total_len;
	struct kvec *iov = rqst->rq_iov;
	int len, rc;

	rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req,
			     &total_len);
	if (rc)
		return rc;

	switch (info_level) {
	case SMB_FIND_FILE_DIRECTORY_INFO:
		req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
		break;
	case SMB_FIND_FILE_ID_FULL_DIR_INFO:
		req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
		break;
	default:
		cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
			info_level);
		return -EINVAL;
	}

	req->FileIndex = cpu_to_le32(index);
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;

	len = 0x2;
	bufptr = req->Buffer;
	memcpy(bufptr, &asteriks, len);

	req->FileNameOffset =
		cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
	req->FileNameLength = cpu_to_le16(len);
	/*
	 * BB could be 30 bytes or so longer if we used SMB2 specific
	 * buffer lengths, but this is safe and close enough.
	 */
	output_size = min_t(unsigned int, output_size, server->maxBuf);
	output_size = min_t(unsigned int, output_size, 2 << 15);
	req->OutputBufferLength = cpu_to_le32(output_size);

	iov[0].iov_base = (char *)req;
	/* 1 for Buffer */
	iov[0].iov_len = total_len - 1;

	iov[1].iov_base = (char *)(req->Buffer);
	iov[1].iov_len = len;

	trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
			tcon->ses->Suid, index, output_size);

	return 0;
}

void SMB2_query_directory_free(struct smb_rqst *rqst)
{
	if (rqst && rqst->rq_iov) {
		cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
	}
}

int
smb2_parse_query_directory(struct cifs_tcon *tcon,
			   struct kvec *rsp_iov,
			   int resp_buftype,
			   struct cifs_search_info *srch_inf)
{
	struct smb2_query_directory_rsp *rsp;
	size_t info_buf_size;
	char *end_of_smb;
	int rc;

	rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base;

	switch (srch_inf->info_level) {
	case SMB_FIND_FILE_DIRECTORY_INFO:
		info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
		break;
	case SMB_FIND_FILE_ID_FULL_DIR_INFO:
		info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
		break;
	default:
		cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
			 srch_inf->info_level);
		return -EINVAL;
	}

	rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
			       le32_to_cpu(rsp->OutputBufferLength), rsp_iov,
			       info_buf_size);
	if (rc)
		return rc;

	srch_inf->unicode = true;

	if (srch_inf->ntwrk_buf_start) {
		if (srch_inf->smallBuf)
			cifs_small_buf_release(srch_inf->ntwrk_buf_start);
		else
			cifs_buf_release(srch_inf->ntwrk_buf_start);
	}
	srch_inf->ntwrk_buf_start = (char *)rsp;
	srch_inf->srch_entries_start = srch_inf->last_entry =
		(char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
	end_of_smb = rsp_iov->iov_len + (char *)rsp;
	srch_inf->entries_in_buffer =
			num_entries(srch_inf->srch_entries_start, end_of_smb,
				    &srch_inf->last_entry, info_buf_size);
	srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
	cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
		 srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
		 srch_inf->srch_entries_start, srch_inf->last_entry);
	if (resp_buftype == CIFS_LARGE_BUFFER)
		srch_inf->smallBuf = false;
	else if (resp_buftype == CIFS_SMALL_BUFFER)
		srch_inf->smallBuf = true;
	else
		cifs_tcon_dbg(VFS, "illegal search buffer type\n");

	return 0;
}

int
SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
		     u64 persistent_fid, u64 volatile_fid, int index,
		     struct cifs_search_info *srch_inf)
{
	struct smb_rqst rqst;
	struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
	struct smb2_query_directory_rsp *rsp = NULL;
	int resp_buftype = CIFS_NO_BUFFER;
	struct kvec rsp_iov;
	int rc = 0;
	struct cifs_ses *ses = tcon->ses;
	int flags = 0;

	if (!ses || !(ses->server))
		return -EIO;

	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	memset(&iov, 0, sizeof(iov));
	rqst.rq_iov = iov;
	rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;

	rc = SMB2_query_directory_init(xid, tcon, &rqst, persistent_fid,
				       volatile_fid, index,
				       srch_inf->info_level);
	if (rc)
		goto qdir_exit;

	rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
	rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;

	if (rc) {
		if (rc == -ENODATA &&
		    rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
			trace_smb3_query_dir_done(xid, persistent_fid,
				tcon->tid, tcon->ses->Suid, index, 0);
			srch_inf->endOfSearch = true;
			rc = 0;
		} else {
			trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
				tcon->ses->Suid, index, 0, rc);
			cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
		}
		goto qdir_exit;
	}

	rc = smb2_parse_query_directory(tcon, &rsp_iov,	resp_buftype,
					srch_inf);
	if (rc) {
		trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
			tcon->ses->Suid, index, 0, rc);
		goto qdir_exit;
	}
	resp_buftype = CIFS_NO_BUFFER;

	trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
			tcon->ses->Suid, index, srch_inf->entries_in_buffer);

qdir_exit:
	SMB2_query_directory_free(&rqst);
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}

int
SMB2_set_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
	       u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
	       u8 info_type, u32 additional_info,
		void **data, unsigned int *size)
{
	struct smb2_set_info_req *req;
	struct kvec *iov = rqst->rq_iov;
	unsigned int i, total_len;
	int rc;

	rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, (void **) &req, &total_len);
	if (rc)
		return rc;

	req->sync_hdr.ProcessId = cpu_to_le32(pid);
	req->InfoType = info_type;
	req->FileInfoClass = info_class;
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;
	req->AdditionalInformation = cpu_to_le32(additional_info);

	req->BufferOffset =
			cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
	req->BufferLength = cpu_to_le32(*size);

	memcpy(req->Buffer, *data, *size);
	total_len += *size;

	iov[0].iov_base = (char *)req;
	/* 1 for Buffer */
	iov[0].iov_len = total_len - 1;

	for (i = 1; i < rqst->rq_nvec; i++) {
		le32_add_cpu(&req->BufferLength, size[i]);
		iov[i].iov_base = (char *)data[i];
		iov[i].iov_len = size[i];
	}

	return 0;
}

void
SMB2_set_info_free(struct smb_rqst *rqst)
{
	if (rqst && rqst->rq_iov)
		cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
}

static int
send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
	       u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
	       u8 info_type, u32 additional_info, unsigned int num,
		void **data, unsigned int *size)
{
	struct smb_rqst rqst;
	struct smb2_set_info_rsp *rsp = NULL;
	struct kvec *iov;
	struct kvec rsp_iov;
	int rc = 0;
	int resp_buftype;
	struct cifs_ses *ses = tcon->ses;
	int flags = 0;

	if (!ses || !(ses->server))
		return -EIO;

	if (!num)
		return -EINVAL;

	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
	if (!iov)
		return -ENOMEM;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	rqst.rq_iov = iov;
	rqst.rq_nvec = num;

	rc = SMB2_set_info_init(tcon, &rqst, persistent_fid, volatile_fid, pid,
				info_class, info_type, additional_info,
				data, size);
	if (rc) {
		kfree(iov);
		return rc;
	}


	rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
			    &rsp_iov);
	SMB2_set_info_free(&rqst);
	rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;

	if (rc != 0) {
		cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
		trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
				ses->Suid, info_class, (__u32)info_type, rc);
	}

	free_rsp_buf(resp_buftype, rsp);
	kfree(iov);
	return rc;
}

int
SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
	     u64 volatile_fid, u32 pid, __le64 *eof)
{
	struct smb2_file_eof_info info;
	void *data;
	unsigned int size;

	info.EndOfFile = *eof;

	data = &info;
	size = sizeof(struct smb2_file_eof_info);

	return send_set_info(xid, tcon, persistent_fid, volatile_fid,
			pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
			0, 1, &data, &size);
}

int
SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
		u64 persistent_fid, u64 volatile_fid,
		struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
{
	return send_set_info(xid, tcon, persistent_fid, volatile_fid,
			current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
			1, (void **)&pnntsd, &pacllen);
}

int
SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
	    u64 persistent_fid, u64 volatile_fid,
	    struct smb2_file_full_ea_info *buf, int len)
{
	return send_set_info(xid, tcon, persistent_fid, volatile_fid,
		current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
		0, 1, (void **)&buf, &len);
}

int
SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
		  const u64 persistent_fid, const u64 volatile_fid,
		  __u8 oplock_level)
{
	struct smb_rqst rqst;
	int rc;
	struct smb2_oplock_break *req = NULL;
	struct cifs_ses *ses = tcon->ses;
	int flags = CIFS_OBREAK_OP;
	unsigned int total_len;
	struct kvec iov[1];
	struct kvec rsp_iov;
	int resp_buf_type;

	cifs_dbg(FYI, "SMB2_oplock_break\n");
	rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
			     &total_len);
	if (rc)
		return rc;

	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	req->VolatileFid = volatile_fid;
	req->PersistentFid = persistent_fid;
	req->OplockLevel = oplock_level;
	req->sync_hdr.CreditRequest = cpu_to_le16(1);

	flags |= CIFS_NO_RSP_BUF;

	iov[0].iov_base = (char *)req;
	iov[0].iov_len = total_len;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	rqst.rq_iov = iov;
	rqst.rq_nvec = 1;

	rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
	cifs_small_buf_release(req);

	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
		cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
	}

	return rc;
}

void
smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
			     struct kstatfs *kst)
{
	kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
			  le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
	kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
	kst->f_bfree  = kst->f_bavail =
			le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
	return;
}

static void
copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
			struct kstatfs *kst)
{
	kst->f_bsize = le32_to_cpu(response_data->BlockSize);
	kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
	kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
	if (response_data->UserBlocksAvail == cpu_to_le64(-1))
		kst->f_bavail = kst->f_bfree;
	else
		kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
	if (response_data->TotalFileNodes != cpu_to_le64(-1))
		kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
	if (response_data->FreeFileNodes != cpu_to_le64(-1))
		kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);

	return;
}

static int
build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
		   int outbuf_len, u64 persistent_fid, u64 volatile_fid)
{
	int rc;
	struct smb2_query_info_req *req;
	unsigned int total_len;

	cifs_dbg(FYI, "Query FSInfo level %d\n", level);

	if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
		return -EIO;

	rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
			     &total_len);
	if (rc)
		return rc;

	req->InfoType = SMB2_O_INFO_FILESYSTEM;
	req->FileInfoClass = level;
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;
	/* 1 for pad */
	req->InputBufferOffset =
			cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
	req->OutputBufferLength = cpu_to_le32(
		outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);

	iov->iov_base = (char *)req;
	iov->iov_len = total_len;
	return 0;
}

int
SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
	      u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
{
	struct smb_rqst rqst;
	struct smb2_query_info_rsp *rsp = NULL;
	struct kvec iov;
	struct kvec rsp_iov;
	int rc = 0;
	int resp_buftype;
	struct cifs_ses *ses = tcon->ses;
	FILE_SYSTEM_POSIX_INFO *info = NULL;
	int flags = 0;

	rc = build_qfs_info_req(&iov, tcon, FS_POSIX_INFORMATION,
				sizeof(FILE_SYSTEM_POSIX_INFO),
				persistent_fid, volatile_fid);
	if (rc)
		return rc;

	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	rqst.rq_iov = &iov;
	rqst.rq_nvec = 1;

	rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
	cifs_small_buf_release(iov.iov_base);
	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
		goto posix_qfsinf_exit;
	}
	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;

	info = (FILE_SYSTEM_POSIX_INFO *)(
		le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
	rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
			       le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
			       sizeof(FILE_SYSTEM_POSIX_INFO));
	if (!rc)
		copy_posix_fs_info_to_kstatfs(info, fsdata);

posix_qfsinf_exit:
	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
	return rc;
}

int
SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
	      u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
{
	struct smb_rqst rqst;
	struct smb2_query_info_rsp *rsp = NULL;
	struct kvec iov;
	struct kvec rsp_iov;
	int rc = 0;
	int resp_buftype;
	struct cifs_ses *ses = tcon->ses;
	struct smb2_fs_full_size_info *info = NULL;
	int flags = 0;

	rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
				sizeof(struct smb2_fs_full_size_info),
				persistent_fid, volatile_fid);
	if (rc)
		return rc;

	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	rqst.rq_iov = &iov;
	rqst.rq_nvec = 1;

	rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
	cifs_small_buf_release(iov.iov_base);
	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
		goto qfsinf_exit;
	}
	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;

	info = (struct smb2_fs_full_size_info *)(
		le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
	rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
			       le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
			       sizeof(struct smb2_fs_full_size_info));
	if (!rc)
		smb2_copy_fs_info_to_kstatfs(info, fsdata);

qfsinf_exit:
	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
	return rc;
}

int
SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
	      u64 persistent_fid, u64 volatile_fid, int level)
{
	struct smb_rqst rqst;
	struct smb2_query_info_rsp *rsp = NULL;
	struct kvec iov;
	struct kvec rsp_iov;
	int rc = 0;
	int resp_buftype, max_len, min_len;
	struct cifs_ses *ses = tcon->ses;
	unsigned int rsp_len, offset;
	int flags = 0;

	if (level == FS_DEVICE_INFORMATION) {
		max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
		min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
	} else if (level == FS_ATTRIBUTE_INFORMATION) {
		max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
		min_len = MIN_FS_ATTR_INFO_SIZE;
	} else if (level == FS_SECTOR_SIZE_INFORMATION) {
		max_len = sizeof(struct smb3_fs_ss_info);
		min_len = sizeof(struct smb3_fs_ss_info);
	} else if (level == FS_VOLUME_INFORMATION) {
		max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
		min_len = sizeof(struct smb3_fs_vol_info);
	} else {
		cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
		return -EINVAL;
	}

	rc = build_qfs_info_req(&iov, tcon, level, max_len,
				persistent_fid, volatile_fid);
	if (rc)
		return rc;

	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	rqst.rq_iov = &iov;
	rqst.rq_nvec = 1;

	rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
	cifs_small_buf_release(iov.iov_base);
	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
		goto qfsattr_exit;
	}
	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;

	rsp_len = le32_to_cpu(rsp->OutputBufferLength);
	offset = le16_to_cpu(rsp->OutputBufferOffset);
	rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
	if (rc)
		goto qfsattr_exit;

	if (level == FS_ATTRIBUTE_INFORMATION)
		memcpy(&tcon->fsAttrInfo, offset
			+ (char *)rsp, min_t(unsigned int,
			rsp_len, max_len));
	else if (level == FS_DEVICE_INFORMATION)
		memcpy(&tcon->fsDevInfo, offset
			+ (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
	else if (level == FS_SECTOR_SIZE_INFORMATION) {
		struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
			(offset + (char *)rsp);
		tcon->ss_flags = le32_to_cpu(ss_info->Flags);
		tcon->perf_sector_size =
			le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
	} else if (level == FS_VOLUME_INFORMATION) {
		struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
			(offset + (char *)rsp);
		tcon->vol_serial_number = vol_info->VolumeSerialNumber;
		tcon->vol_create_time = vol_info->VolumeCreationTime;
	}

qfsattr_exit:
	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
	return rc;
}

int
smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
	   const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
	   const __u32 num_lock, struct smb2_lock_element *buf)
{
	struct smb_rqst rqst;
	int rc = 0;
	struct smb2_lock_req *req = NULL;
	struct kvec iov[2];
	struct kvec rsp_iov;
	int resp_buf_type;
	unsigned int count;
	int flags = CIFS_NO_RSP_BUF;
	unsigned int total_len;

	cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);

	rc = smb2_plain_req_init(SMB2_LOCK, tcon, (void **) &req, &total_len);
	if (rc)
		return rc;

	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	req->sync_hdr.ProcessId = cpu_to_le32(pid);
	req->LockCount = cpu_to_le16(num_lock);

	req->PersistentFileId = persist_fid;
	req->VolatileFileId = volatile_fid;

	count = num_lock * sizeof(struct smb2_lock_element);

	iov[0].iov_base = (char *)req;
	iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
	iov[1].iov_base = (char *)buf;
	iov[1].iov_len = count;

	cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);

	memset(&rqst, 0, sizeof(struct smb_rqst));
	rqst.rq_iov = iov;
	rqst.rq_nvec = 2;

	rc = cifs_send_recv(xid, tcon->ses, &rqst, &resp_buf_type, flags,
			    &rsp_iov);
	cifs_small_buf_release(req);
	if (rc) {
		cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
		cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
		trace_smb3_lock_err(xid, persist_fid, tcon->tid,
				    tcon->ses->Suid, rc);
	}

	return rc;
}

int
SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
	  const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
	  const __u64 length, const __u64 offset, const __u32 lock_flags,
	  const bool wait)
{
	struct smb2_lock_element lock;

	lock.Offset = cpu_to_le64(offset);
	lock.Length = cpu_to_le64(length);
	lock.Flags = cpu_to_le32(lock_flags);
	if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
		lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);

	return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
}

int
SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
		 __u8 *lease_key, const __le32 lease_state)
{
	struct smb_rqst rqst;
	int rc;
	struct smb2_lease_ack *req = NULL;
	struct cifs_ses *ses = tcon->ses;
	int flags = CIFS_OBREAK_OP;
	unsigned int total_len;
	struct kvec iov[1];
	struct kvec rsp_iov;
	int resp_buf_type;
	__u64 *please_key_high;
	__u64 *please_key_low;

	cifs_dbg(FYI, "SMB2_lease_break\n");
	rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
			     &total_len);
	if (rc)
		return rc;

	if (smb3_encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	req->sync_hdr.CreditRequest = cpu_to_le16(1);
	req->StructureSize = cpu_to_le16(36);
	total_len += 12;

	memcpy(req->LeaseKey, lease_key, 16);
	req->LeaseState = lease_state;

	flags |= CIFS_NO_RSP_BUF;

	iov[0].iov_base = (char *)req;
	iov[0].iov_len = total_len;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	rqst.rq_iov = iov;
	rqst.rq_nvec = 1;

	rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
	cifs_small_buf_release(req);

	please_key_low = (__u64 *)lease_key;
	please_key_high = (__u64 *)(lease_key+8);
	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
		trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
			ses->Suid, *please_key_low, *please_key_high, rc);
		cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
	} else
		trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
			ses->Suid, *please_key_low, *please_key_high);

	return rc;
}