summaryrefslogtreecommitdiffstats
path: root/fs/cifs/connect.c
blob: 78fd7557e35d41b9856373a66fabdf8a048cfbca (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
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
/*
 *   fs/cifs/connect.c
 *
 *   Copyright (C) International Business Machines  Corp., 2002,2009
 *   Author(s): Steve French (sfrench@us.ibm.com)
 *
 *   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
 */
#include <linux/fs.h>
#include <linux/net.h>
#include <linux/string.h>
#include <linux/list.h>
#include <linux/wait.h>
#include <linux/slab.h>
#include <linux/pagemap.h>
#include <linux/ctype.h>
#include <linux/utsname.h>
#include <linux/mempool.h>
#include <linux/delay.h>
#include <linux/completion.h>
#include <linux/kthread.h>
#include <linux/pagevec.h>
#include <linux/freezer.h>
#include <linux/namei.h>
#include <asm/uaccess.h>
#include <asm/processor.h>
#include <linux/inet.h>
#include <net/ipv6.h>
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_unicode.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"
#include "ntlmssp.h"
#include "nterr.h"
#include "rfc1002pdu.h"
#include "fscache.h"

#define CIFS_PORT 445
#define RFC1001_PORT 139

/* SMB echo "timeout" -- FIXME: tunable? */
#define SMB_ECHO_INTERVAL (60 * HZ)

extern mempool_t *cifs_req_poolp;

/* FIXME: should these be tunable? */
#define TLINK_ERROR_EXPIRE	(1 * HZ)
#define TLINK_IDLE_EXPIRE	(600 * HZ)

static int ip_connect(struct TCP_Server_Info *server);
static int generic_ip_connect(struct TCP_Server_Info *server);
static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
static void cifs_prune_tlinks(struct work_struct *work);

/*
 * cifs tcp session reconnection
 *
 * mark tcp session as reconnecting so temporarily locked
 * mark all smb sessions as reconnecting for tcp session
 * reconnect tcp session
 * wake up waiters on reconnection? - (not needed currently)
 */
static int
cifs_reconnect(struct TCP_Server_Info *server)
{
	int rc = 0;
	struct list_head *tmp, *tmp2;
	struct cifs_ses *ses;
	struct cifs_tcon *tcon;
	struct mid_q_entry *mid_entry;
	struct list_head retry_list;

	spin_lock(&GlobalMid_Lock);
	if (server->tcpStatus == CifsExiting) {
		/* the demux thread will exit normally
		next time through the loop */
		spin_unlock(&GlobalMid_Lock);
		return rc;
	} else
		server->tcpStatus = CifsNeedReconnect;
	spin_unlock(&GlobalMid_Lock);
	server->maxBuf = 0;

	cFYI(1, "Reconnecting tcp session");

	/* before reconnecting the tcp session, mark the smb session (uid)
		and the tid bad so they are not used until reconnected */
	cFYI(1, "%s: marking sessions and tcons for reconnect", __func__);
	spin_lock(&cifs_tcp_ses_lock);
	list_for_each(tmp, &server->smb_ses_list) {
		ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
		ses->need_reconnect = true;
		ses->ipc_tid = 0;
		list_for_each(tmp2, &ses->tcon_list) {
			tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
			tcon->need_reconnect = true;
		}
	}
	spin_unlock(&cifs_tcp_ses_lock);

	/* do not want to be sending data on a socket we are freeing */
	cFYI(1, "%s: tearing down socket", __func__);
	mutex_lock(&server->srv_mutex);
	if (server->ssocket) {
		cFYI(1, "State: 0x%x Flags: 0x%lx", server->ssocket->state,
			server->ssocket->flags);
		kernel_sock_shutdown(server->ssocket, SHUT_WR);
		cFYI(1, "Post shutdown state: 0x%x Flags: 0x%lx",
			server->ssocket->state,
			server->ssocket->flags);
		sock_release(server->ssocket);
		server->ssocket = NULL;
	}
	server->sequence_number = 0;
	server->session_estab = false;
	kfree(server->session_key.response);
	server->session_key.response = NULL;
	server->session_key.len = 0;
	server->lstrp = jiffies;
	mutex_unlock(&server->srv_mutex);

	/* mark submitted MIDs for retry and issue callback */
	INIT_LIST_HEAD(&retry_list);
	cFYI(1, "%s: moving mids to private list", __func__);
	spin_lock(&GlobalMid_Lock);
	list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
		mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
		if (mid_entry->midState == MID_REQUEST_SUBMITTED)
			mid_entry->midState = MID_RETRY_NEEDED;
		list_move(&mid_entry->qhead, &retry_list);
	}
	spin_unlock(&GlobalMid_Lock);

	cFYI(1, "%s: issuing mid callbacks", __func__);
	list_for_each_safe(tmp, tmp2, &retry_list) {
		mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
		list_del_init(&mid_entry->qhead);
		mid_entry->callback(mid_entry);
	}

	do {
		try_to_freeze();

		/* we should try only the port we connected to before */
		rc = generic_ip_connect(server);
		if (rc) {
			cFYI(1, "reconnect error %d", rc);
			msleep(3000);
		} else {
			atomic_inc(&tcpSesReconnectCount);
			spin_lock(&GlobalMid_Lock);
			if (server->tcpStatus != CifsExiting)
				server->tcpStatus = CifsNeedNegotiate;
			spin_unlock(&GlobalMid_Lock);
		}
	} while (server->tcpStatus == CifsNeedReconnect);

	return rc;
}

/*
	return codes:
		0 	not a transact2, or all data present
		>0 	transact2 with that much data missing
		-EINVAL = invalid transact2

 */
static int check2ndT2(struct smb_hdr *pSMB, unsigned int maxBufSize)
{
	struct smb_t2_rsp *pSMBt;
	int remaining;
	__u16 total_data_size, data_in_this_rsp;

	if (pSMB->Command != SMB_COM_TRANSACTION2)
		return 0;

	/* check for plausible wct, bcc and t2 data and parm sizes */
	/* check for parm and data offset going beyond end of smb */
	if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
		cFYI(1, "invalid transact2 word count");
		return -EINVAL;
	}

	pSMBt = (struct smb_t2_rsp *)pSMB;

	total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
	data_in_this_rsp = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);

	if (total_data_size == data_in_this_rsp)
		return 0;
	else if (total_data_size < data_in_this_rsp) {
		cFYI(1, "total data %d smaller than data in frame %d",
			total_data_size, data_in_this_rsp);
		return -EINVAL;
	}

	remaining = total_data_size - data_in_this_rsp;

	cFYI(1, "missing %d bytes from transact2, check next response",
		remaining);
	if (total_data_size > maxBufSize) {
		cERROR(1, "TotalDataSize %d is over maximum buffer %d",
			total_data_size, maxBufSize);
		return -EINVAL;
	}
	return remaining;
}

static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
{
	struct smb_t2_rsp *pSMB2 = (struct smb_t2_rsp *)psecond;
	struct smb_t2_rsp *pSMBt  = (struct smb_t2_rsp *)pTargetSMB;
	char *data_area_of_target;
	char *data_area_of_buf2;
	int remaining;
	unsigned int byte_count, total_in_buf;
	__u16 total_data_size, total_in_buf2;

	total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);

	if (total_data_size !=
	    get_unaligned_le16(&pSMB2->t2_rsp.TotalDataCount))
		cFYI(1, "total data size of primary and secondary t2 differ");

	total_in_buf = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);

	remaining = total_data_size - total_in_buf;

	if (remaining < 0)
		return -EPROTO;

	if (remaining == 0) /* nothing to do, ignore */
		return 0;

	total_in_buf2 = get_unaligned_le16(&pSMB2->t2_rsp.DataCount);
	if (remaining < total_in_buf2) {
		cFYI(1, "transact2 2nd response contains too much data");
	}

	/* find end of first SMB data area */
	data_area_of_target = (char *)&pSMBt->hdr.Protocol +
				get_unaligned_le16(&pSMBt->t2_rsp.DataOffset);
	/* validate target area */

	data_area_of_buf2 = (char *)&pSMB2->hdr.Protocol +
				get_unaligned_le16(&pSMB2->t2_rsp.DataOffset);

	data_area_of_target += total_in_buf;

	/* copy second buffer into end of first buffer */
	total_in_buf += total_in_buf2;
	/* is the result too big for the field? */
	if (total_in_buf > USHRT_MAX)
		return -EPROTO;
	put_unaligned_le16(total_in_buf, &pSMBt->t2_rsp.DataCount);

	/* fix up the BCC */
	byte_count = get_bcc(pTargetSMB);
	byte_count += total_in_buf2;
	/* is the result too big for the field? */
	if (byte_count > USHRT_MAX)
		return -EPROTO;
	put_bcc(byte_count, pTargetSMB);

	byte_count = be32_to_cpu(pTargetSMB->smb_buf_length);
	byte_count += total_in_buf2;
	/* don't allow buffer to overflow */
	if (byte_count > CIFSMaxBufSize)
		return -ENOBUFS;
	pTargetSMB->smb_buf_length = cpu_to_be32(byte_count);

	memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);

	if (remaining == total_in_buf2) {
		cFYI(1, "found the last secondary response");
		return 0; /* we are done */
	} else /* more responses to go */
		return 1;
}

static void
cifs_echo_request(struct work_struct *work)
{
	int rc;
	struct TCP_Server_Info *server = container_of(work,
					struct TCP_Server_Info, echo.work);

	/*
	 * We cannot send an echo until the NEGOTIATE_PROTOCOL request is
	 * done, which is indicated by maxBuf != 0. Also, no need to ping if
	 * we got a response recently
	 */
	if (server->maxBuf == 0 ||
	    time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ))
		goto requeue_echo;

	rc = CIFSSMBEcho(server);
	if (rc)
		cFYI(1, "Unable to send echo request to server: %s",
			server->hostname);

requeue_echo:
	queue_delayed_work(system_nrt_wq, &server->echo, SMB_ECHO_INTERVAL);
}

static int
cifs_demultiplex_thread(struct TCP_Server_Info *server)
{
	int length;
	unsigned int pdu_length, total_read;
	struct smb_hdr *smb_buffer = NULL;
	struct smb_hdr *bigbuf = NULL;
	struct smb_hdr *smallbuf = NULL;
	struct msghdr smb_msg;
	struct kvec iov;
	struct socket *csocket = server->ssocket;
	struct list_head *tmp, *tmp2;
	struct task_struct *task_to_wake = NULL;
	struct mid_q_entry *mid_entry;
	char temp;
	bool isLargeBuf = false;
	bool isMultiRsp;
	int reconnect;

	current->flags |= PF_MEMALLOC;
	cFYI(1, "Demultiplex PID: %d", task_pid_nr(current));

	length = atomic_inc_return(&tcpSesAllocCount);
	if (length > 1)
		mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
				GFP_KERNEL);

	set_freezable();
	while (server->tcpStatus != CifsExiting) {
		if (try_to_freeze())
			continue;
		if (bigbuf == NULL) {
			bigbuf = cifs_buf_get();
			if (!bigbuf) {
				cERROR(1, "No memory for large SMB response");
				msleep(3000);
				/* retry will check if exiting */
				continue;
			}
		} else if (isLargeBuf) {
			/* we are reusing a dirty large buf, clear its start */
			memset(bigbuf, 0, sizeof(struct smb_hdr));
		}

		if (smallbuf == NULL) {
			smallbuf = cifs_small_buf_get();
			if (!smallbuf) {
				cERROR(1, "No memory for SMB response");
				msleep(1000);
				/* retry will check if exiting */
				continue;
			}
			/* beginning of smb buffer is cleared in our buf_get */
		} else /* if existing small buf clear beginning */
			memset(smallbuf, 0, sizeof(struct smb_hdr));

		isLargeBuf = false;
		isMultiRsp = false;
		smb_buffer = smallbuf;
		iov.iov_base = smb_buffer;
		iov.iov_len = 4;
		smb_msg.msg_control = NULL;
		smb_msg.msg_controllen = 0;
		pdu_length = 4; /* enough to get RFC1001 header */

incomplete_rcv:
		if (echo_retries > 0 && server->tcpStatus == CifsGood &&
		    time_after(jiffies, server->lstrp +
					(echo_retries * SMB_ECHO_INTERVAL))) {
			cERROR(1, "Server %s has not responded in %d seconds. "
				  "Reconnecting...", server->hostname,
				  (echo_retries * SMB_ECHO_INTERVAL / HZ));
			cifs_reconnect(server);
			csocket = server->ssocket;
			wake_up(&server->response_q);
			continue;
		}

		length =
		    kernel_recvmsg(csocket, &smb_msg,
				&iov, 1, pdu_length, 0 /* BB other flags? */);

		if (server->tcpStatus == CifsExiting) {
			break;
		} else if (server->tcpStatus == CifsNeedReconnect) {
			cFYI(1, "Reconnect after server stopped responding");
			cifs_reconnect(server);
			cFYI(1, "call to reconnect done");
			csocket = server->ssocket;
			continue;
		} else if (length == -ERESTARTSYS ||
			   length == -EAGAIN ||
			   length == -EINTR) {
			msleep(1); /* minimum sleep to prevent looping
				allowing socket to clear and app threads to set
				tcpStatus CifsNeedReconnect if server hung */
			if (pdu_length < 4) {
				iov.iov_base = (4 - pdu_length) +
							(char *)smb_buffer;
				iov.iov_len = pdu_length;
				smb_msg.msg_control = NULL;
				smb_msg.msg_controllen = 0;
				goto incomplete_rcv;
			} else
				continue;
		} else if (length <= 0) {
			cFYI(1, "Reconnect after unexpected peek error %d",
				length);
			cifs_reconnect(server);
			csocket = server->ssocket;
			wake_up(&server->response_q);
			continue;
		} else if (length < pdu_length) {
			cFYI(1, "requested %d bytes but only got %d bytes",
				  pdu_length, length);
			pdu_length -= length;
			msleep(1);
			goto incomplete_rcv;
		}

		/* The right amount was read from socket - 4 bytes */
		/* so we can now interpret the length field */

		/* the first byte big endian of the length field,
		is actually not part of the length but the type
		with the most common, zero, as regular data */
		temp = *((char *) smb_buffer);

		/* Note that FC 1001 length is big endian on the wire,
		but we convert it here so it is always manipulated
		as host byte order */
		pdu_length = be32_to_cpu(smb_buffer->smb_buf_length);

		cFYI(1, "rfc1002 length 0x%x", pdu_length+4);

		if (temp == (char) RFC1002_SESSION_KEEP_ALIVE) {
			continue;
		} else if (temp == (char)RFC1002_POSITIVE_SESSION_RESPONSE) {
			cFYI(1, "Good RFC 1002 session rsp");
			continue;
		} else if (temp == (char)RFC1002_NEGATIVE_SESSION_RESPONSE) {
			/* we get this from Windows 98 instead of
			   an error on SMB negprot response */
			cFYI(1, "Negative RFC1002 Session Response Error 0x%x)",
				pdu_length);
			/* give server a second to clean up  */
			msleep(1000);
			/* always try 445 first on reconnect since we get NACK
			 * on some if we ever connected to port 139 (the NACK
			 * is since we do not begin with RFC1001 session
			 * initialize frame)
			 */
			cifs_set_port((struct sockaddr *)
					&server->dstaddr, CIFS_PORT);
			cifs_reconnect(server);
			csocket = server->ssocket;
			wake_up(&server->response_q);
			continue;
		} else if (temp != (char) 0) {
			cERROR(1, "Unknown RFC 1002 frame");
			cifs_dump_mem(" Received Data: ", (char *)smb_buffer,
				      length);
			cifs_reconnect(server);
			csocket = server->ssocket;
			continue;
		}

		/* else we have an SMB response */
		if ((pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) ||
			    (pdu_length < sizeof(struct smb_hdr) - 1 - 4)) {
			cERROR(1, "Invalid size SMB length %d pdu_length %d",
					length, pdu_length+4);
			cifs_reconnect(server);
			csocket = server->ssocket;
			wake_up(&server->response_q);
			continue;
		}

		/* else length ok */
		reconnect = 0;

		if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
			isLargeBuf = true;
			memcpy(bigbuf, smallbuf, 4);
			smb_buffer = bigbuf;
		}
		length = 0;
		iov.iov_base = 4 + (char *)smb_buffer;
		iov.iov_len = pdu_length;
		for (total_read = 0; total_read < pdu_length;
		     total_read += length) {
			length = kernel_recvmsg(csocket, &smb_msg, &iov, 1,
						pdu_length - total_read, 0);
			if (server->tcpStatus == CifsExiting) {
				/* then will exit */
				reconnect = 2;
				break;
			} else if (server->tcpStatus == CifsNeedReconnect) {
				cifs_reconnect(server);
				csocket = server->ssocket;
				/* Reconnect wakes up rspns q */
				/* Now we will reread sock */
				reconnect = 1;
				break;
			} else if (length == -ERESTARTSYS ||
				   length == -EAGAIN ||
				   length == -EINTR) {
				msleep(1); /* minimum sleep to prevent looping,
					      allowing socket to clear and app
					      threads to set tcpStatus
					      CifsNeedReconnect if server hung*/
				length = 0;
				continue;
			} else if (length <= 0) {
				cERROR(1, "Received no data, expecting %d",
					      pdu_length - total_read);
				cifs_reconnect(server);
				csocket = server->ssocket;
				reconnect = 1;
				break;
			}
		}
		if (reconnect == 2)
			break;
		else if (reconnect == 1)
			continue;

		total_read += 4; /* account for rfc1002 hdr */

		dump_smb(smb_buffer, total_read);

		/*
		 * We know that we received enough to get to the MID as we
		 * checked the pdu_length earlier. Now check to see
		 * if the rest of the header is OK. We borrow the length
		 * var for the rest of the loop to avoid a new stack var.
		 *
		 * 48 bytes is enough to display the header and a little bit
		 * into the payload for debugging purposes.
		 */
		length = checkSMB(smb_buffer, smb_buffer->Mid, total_read);
		if (length != 0)
			cifs_dump_mem("Bad SMB: ", smb_buffer,
					min_t(unsigned int, total_read, 48));

		mid_entry = NULL;
		server->lstrp = jiffies;

		spin_lock(&GlobalMid_Lock);
		list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
			mid_entry = list_entry(tmp, struct mid_q_entry, qhead);

			if (mid_entry->mid != smb_buffer->Mid ||
			    mid_entry->midState != MID_REQUEST_SUBMITTED ||
			    mid_entry->command != smb_buffer->Command) {
				mid_entry = NULL;
				continue;
			}

			if (length == 0 &&
			    check2ndT2(smb_buffer, server->maxBuf) > 0) {
				/* We have a multipart transact2 resp */
				isMultiRsp = true;
				if (mid_entry->resp_buf) {
					/* merge response - fix up 1st*/
					length = coalesce_t2(smb_buffer,
							mid_entry->resp_buf);
					if (length > 0) {
						length = 0;
						mid_entry->multiRsp = true;
						break;
					} else {
						/* all parts received or
						 * packet is malformed
						 */
						mid_entry->multiEnd = true;
						goto multi_t2_fnd;
					}
				} else {
					if (!isLargeBuf) {
						/*
						 * FIXME: switch to already
						 *        allocated largebuf?
						 */
						cERROR(1, "1st trans2 resp "
							  "needs bigbuf");
					} else {
						/* Have first buffer */
						mid_entry->resp_buf =
							 smb_buffer;
						mid_entry->largeBuf = true;
						bigbuf = NULL;
					}
				}
				break;
			}
			mid_entry->resp_buf = smb_buffer;
			mid_entry->largeBuf = isLargeBuf;
multi_t2_fnd:
			if (length == 0)
				mid_entry->midState = MID_RESPONSE_RECEIVED;
			else
				mid_entry->midState = MID_RESPONSE_MALFORMED;
#ifdef CONFIG_CIFS_STATS2
			mid_entry->when_received = jiffies;
#endif
			list_del_init(&mid_entry->qhead);
			break;
		}
		spin_unlock(&GlobalMid_Lock);

		if (mid_entry != NULL) {
			mid_entry->callback(mid_entry);
			/* Was previous buf put in mpx struct for multi-rsp? */
			if (!isMultiRsp) {
				/* smb buffer will be freed by user thread */
				if (isLargeBuf)
					bigbuf = NULL;
				else
					smallbuf = NULL;
			}
		} else if (length != 0) {
			/* response sanity checks failed */
			continue;
		} else if (!is_valid_oplock_break(smb_buffer, server) &&
			   !isMultiRsp) {
			cERROR(1, "No task to wake, unknown frame received! "
				   "NumMids %d", atomic_read(&midCount));
			cifs_dump_mem("Received Data is: ", (char *)smb_buffer,
				      sizeof(struct smb_hdr));
#ifdef CONFIG_CIFS_DEBUG2
			cifs_dump_detail(smb_buffer);
			cifs_dump_mids(server);
#endif /* CIFS_DEBUG2 */

		}
	} /* end while !EXITING */

	/* take it off the list, if it's not already */
	spin_lock(&cifs_tcp_ses_lock);
	list_del_init(&server->tcp_ses_list);
	spin_unlock(&cifs_tcp_ses_lock);

	spin_lock(&GlobalMid_Lock);
	server->tcpStatus = CifsExiting;
	spin_unlock(&GlobalMid_Lock);
	wake_up_all(&server->response_q);

	/* check if we have blocked requests that need to free */
	/* Note that cifs_max_pending is normally 50, but
	can be set at module install time to as little as two */
	spin_lock(&GlobalMid_Lock);
	if (atomic_read(&server->inFlight) >= cifs_max_pending)
		atomic_set(&server->inFlight, cifs_max_pending - 1);
	/* We do not want to set the max_pending too low or we
	could end up with the counter going negative */
	spin_unlock(&GlobalMid_Lock);
	/* Although there should not be any requests blocked on
	this queue it can not hurt to be paranoid and try to wake up requests
	that may haven been blocked when more than 50 at time were on the wire
	to the same server - they now will see the session is in exit state
	and get out of SendReceive.  */
	wake_up_all(&server->request_q);
	/* give those requests time to exit */
	msleep(125);

	if (server->ssocket) {
		sock_release(csocket);
		server->ssocket = NULL;
	}
	/* buffer usually freed in free_mid - need to free it here on exit */
	cifs_buf_release(bigbuf);
	if (smallbuf) /* no sense logging a debug message if NULL */
		cifs_small_buf_release(smallbuf);

	if (!list_empty(&server->pending_mid_q)) {
		struct list_head dispose_list;

		INIT_LIST_HEAD(&dispose_list);
		spin_lock(&GlobalMid_Lock);
		list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
			mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
			cFYI(1, "Clearing mid 0x%x", mid_entry->mid);
			mid_entry->midState = MID_SHUTDOWN;
			list_move(&mid_entry->qhead, &dispose_list);
		}
		spin_unlock(&GlobalMid_Lock);

		/* now walk dispose list and issue callbacks */
		list_for_each_safe(tmp, tmp2, &dispose_list) {
			mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
			cFYI(1, "Callback mid 0x%x", mid_entry->mid);
			list_del_init(&mid_entry->qhead);
			mid_entry->callback(mid_entry);
		}
		/* 1/8th of sec is more than enough time for them to exit */
		msleep(125);
	}

	if (!list_empty(&server->pending_mid_q)) {
		/* mpx threads have not exited yet give them
		at least the smb send timeout time for long ops */
		/* due to delays on oplock break requests, we need
		to wait at least 45 seconds before giving up
		on a request getting a response and going ahead
		and killing cifsd */
		cFYI(1, "Wait for exit from demultiplex thread");
		msleep(46000);
		/* if threads still have not exited they are probably never
		coming home not much else we can do but free the memory */
	}

	kfree(server->hostname);
	task_to_wake = xchg(&server->tsk, NULL);
	kfree(server);

	length = atomic_dec_return(&tcpSesAllocCount);
	if (length  > 0)
		mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
				GFP_KERNEL);

	/* if server->tsk was NULL then wait for a signal before exiting */
	if (!task_to_wake) {
		set_current_state(TASK_INTERRUPTIBLE);
		while (!signal_pending(current)) {
			schedule();
			set_current_state(TASK_INTERRUPTIBLE);
		}
		set_current_state(TASK_RUNNING);
	}

	module_put_and_exit(0);
}

/* extract the host portion of the UNC string */
static char *
extract_hostname(const char *unc)
{
	const char *src;
	char *dst, *delim;
	unsigned int len;

	/* skip double chars at beginning of string */
	/* BB: check validity of these bytes? */
	src = unc + 2;

	/* delimiter between hostname and sharename is always '\\' now */
	delim = strchr(src, '\\');
	if (!delim)
		return ERR_PTR(-EINVAL);

	len = delim - src;
	dst = kmalloc((len + 1), GFP_KERNEL);
	if (dst == NULL)
		return ERR_PTR(-ENOMEM);

	memcpy(dst, src, len);
	dst[len] = '\0';

	return dst;
}

static int
cifs_parse_mount_options(const char *mountdata, const char *devname,
			 struct smb_vol *vol)
{
	char *value, *data, *end;
	char *mountdata_copy = NULL, *options;
	unsigned int  temp_len, i, j;
	char separator[2];
	short int override_uid = -1;
	short int override_gid = -1;
	bool uid_specified = false;
	bool gid_specified = false;
	char *nodename = utsname()->nodename;

	separator[0] = ',';
	separator[1] = 0;

	/*
	 * does not have to be perfect mapping since field is
	 * informational, only used for servers that do not support
	 * port 445 and it can be overridden at mount time
	 */
	memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
	for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
		vol->source_rfc1001_name[i] = toupper(nodename[i]);

	vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
	/* null target name indicates to use *SMBSERVR default called name
	   if we end up sending RFC1001 session initialize */
	vol->target_rfc1001_name[0] = 0;
	vol->cred_uid = current_uid();
	vol->linux_uid = current_uid();
	vol->linux_gid = current_gid();

	/* default to only allowing write access to owner of the mount */
	vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;

	/* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
	/* default is always to request posix paths. */
	vol->posix_paths = 1;
	/* default to using server inode numbers where available */
	vol->server_ino = 1;

	vol->actimeo = CIFS_DEF_ACTIMEO;

	if (!mountdata)
		goto cifs_parse_mount_err;

	mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
	if (!mountdata_copy)
		goto cifs_parse_mount_err;

	options = mountdata_copy;
	end = options + strlen(options);
	if (strncmp(options, "sep=", 4) == 0) {
		if (options[4] != 0) {
			separator[0] = options[4];
			options += 5;
		} else {
			cFYI(1, "Null separator not allowed");
		}
	}

	while ((data = strsep(&options, separator)) != NULL) {
		if (!*data)
			continue;
		if ((value = strchr(data, '=')) != NULL)
			*value++ = '\0';

		/* Have to parse this before we parse for "user" */
		if (strnicmp(data, "user_xattr", 10) == 0) {
			vol->no_xattr = 0;
		} else if (strnicmp(data, "nouser_xattr", 12) == 0) {
			vol->no_xattr = 1;
		} else if (strnicmp(data, "user", 4) == 0) {
			if (!value) {
				printk(KERN_WARNING
				       "CIFS: invalid or missing username\n");
				goto cifs_parse_mount_err;
			} else if (!*value) {
				/* null user, ie anonymous, authentication */
				vol->nullauth = 1;
			}
			if (strnlen(value, MAX_USERNAME_SIZE) <
						MAX_USERNAME_SIZE) {
				vol->username = kstrdup(value, GFP_KERNEL);
				if (!vol->username) {
					printk(KERN_WARNING "CIFS: no memory "
							    "for username\n");
					goto cifs_parse_mount_err;
				}
			} else {
				printk(KERN_WARNING "CIFS: username too long\n");
				goto cifs_parse_mount_err;
			}
		} else if (strnicmp(data, "pass", 4) == 0) {
			if (!value) {
				vol->password = NULL;
				continue;
			} else if (value[0] == 0) {
				/* check if string begins with double comma
				   since that would mean the password really
				   does start with a comma, and would not
				   indicate an empty string */
				if (value[1] != separator[0]) {
					vol->password = NULL;
					continue;
				}
			}
			temp_len = strlen(value);
			/* removed password length check, NTLM passwords
				can be arbitrarily long */

			/* if comma in password, the string will be
			prematurely null terminated.  Commas in password are
			specified across the cifs mount interface by a double
			comma ie ,, and a comma used as in other cases ie ','
			as a parameter delimiter/separator is single and due
			to the strsep above is temporarily zeroed. */

			/* NB: password legally can have multiple commas and
			the only illegal character in a password is null */

			if ((value[temp_len] == 0) &&
			    (value + temp_len < end) &&
			    (value[temp_len+1] == separator[0])) {
				/* reinsert comma */
				value[temp_len] = separator[0];
				temp_len += 2;  /* move after second comma */
				while (value[temp_len] != 0)  {
					if (value[temp_len] == separator[0]) {
						if (value[temp_len+1] ==
						     separator[0]) {
						/* skip second comma */
							temp_len++;
						} else {
						/* single comma indicating start
							 of next parm */
							break;
						}
					}
					temp_len++;
				}
				if (value[temp_len] == 0) {
					options = NULL;
				} else {
					value[temp_len] = 0;
					/* point option to start of next parm */
					options = value + temp_len + 1;
				}
				/* go from value to value + temp_len condensing
				double commas to singles. Note that this ends up
				allocating a few bytes too many, which is ok */
				vol->password = kzalloc(temp_len, GFP_KERNEL);
				if (vol->password == NULL) {
					printk(KERN_WARNING "CIFS: no memory "
							    "for password\n");
					goto cifs_parse_mount_err;
				}
				for (i = 0, j = 0; i < temp_len; i++, j++) {
					vol->password[j] = value[i];
					if (value[i] == separator[0]
						&& value[i+1] == separator[0]) {
						/* skip second comma */
						i++;
					}
				}
				vol->password[j] = 0;
			} else {
				vol->password = kzalloc(temp_len+1, GFP_KERNEL);
				if (vol->password == NULL) {
					printk(KERN_WARNING "CIFS: no memory "
							    "for password\n");
					goto cifs_parse_mount_err;
				}
				strcpy(vol->password, value);
			}
		} else if (!strnicmp(data, "ip", 2) ||
			   !strnicmp(data, "addr", 4)) {
			if (!value || !*value) {
				vol->UNCip = NULL;
			} else if (strnlen(value, INET6_ADDRSTRLEN) <
							INET6_ADDRSTRLEN) {
				vol->UNCip = kstrdup(value, GFP_KERNEL);
				if (!vol->UNCip) {
					printk(KERN_WARNING "CIFS: no memory "
							    "for UNC IP\n");
					goto cifs_parse_mount_err;
				}
			} else {
				printk(KERN_WARNING "CIFS: ip address "
						    "too long\n");
				goto cifs_parse_mount_err;
			}
		} else if (strnicmp(data, "sec", 3) == 0) {
			if (!value || !*value) {
				cERROR(1, "no security value specified");
				continue;
			} else if (strnicmp(value, "krb5i", 5) == 0) {
				vol->secFlg |= CIFSSEC_MAY_KRB5 |
					CIFSSEC_MUST_SIGN;
			} else if (strnicmp(value, "krb5p", 5) == 0) {
				/* vol->secFlg |= CIFSSEC_MUST_SEAL |
					CIFSSEC_MAY_KRB5; */
				cERROR(1, "Krb5 cifs privacy not supported");
				goto cifs_parse_mount_err;
			} else if (strnicmp(value, "krb5", 4) == 0) {
				vol->secFlg |= CIFSSEC_MAY_KRB5;
			} else if (strnicmp(value, "ntlmsspi", 8) == 0) {
				vol->secFlg |= CIFSSEC_MAY_NTLMSSP |
					CIFSSEC_MUST_SIGN;
			} else if (strnicmp(value, "ntlmssp", 7) == 0) {
				vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
			} else if (strnicmp(value, "ntlmv2i", 7) == 0) {
				vol->secFlg |= CIFSSEC_MAY_NTLMV2 |
					CIFSSEC_MUST_SIGN;
			} else if (strnicmp(value, "ntlmv2", 6) == 0) {
				vol->secFlg |= CIFSSEC_MAY_NTLMV2;
			} else if (strnicmp(value, "ntlmi", 5) == 0) {
				vol->secFlg |= CIFSSEC_MAY_NTLM |
					CIFSSEC_MUST_SIGN;
			} else if (strnicmp(value, "ntlm", 4) == 0) {
				/* ntlm is default so can be turned off too */
				vol->secFlg |= CIFSSEC_MAY_NTLM;
			} else if (strnicmp(value, "nontlm", 6) == 0) {
				/* BB is there a better way to do this? */
				vol->secFlg |= CIFSSEC_MAY_NTLMV2;
#ifdef CONFIG_CIFS_WEAK_PW_HASH
			} else if (strnicmp(value, "lanman", 6) == 0) {
				vol->secFlg |= CIFSSEC_MAY_LANMAN;
#endif
			} else if (strnicmp(value, "none", 4) == 0) {
				vol->nullauth = 1;
			} else {
				cERROR(1, "bad security option: %s", value);
				goto cifs_parse_mount_err;
			}
		} else if (strnicmp(data, "vers", 3) == 0) {
			if (!value || !*value) {
				cERROR(1, "no protocol version specified"
					  " after vers= mount option");
			} else if ((strnicmp(value, "cifs", 4) == 0) ||
				   (strnicmp(value, "1", 1) == 0)) {
				/* this is the default */
				continue;
			}
		} else if ((strnicmp(data, "unc", 3) == 0)
			   || (strnicmp(data, "target", 6) == 0)
			   || (strnicmp(data, "path", 4) == 0)) {
			if (!value || !*value) {
				printk(KERN_WARNING "CIFS: invalid path to "
						    "network resource\n");
				goto cifs_parse_mount_err;
			}
			if ((temp_len = strnlen(value, 300)) < 300) {
				vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
				if (vol->UNC == NULL)
					goto cifs_parse_mount_err;
				strcpy(vol->UNC, value);
				if (strncmp(vol->UNC, "//", 2) == 0) {
					vol->UNC[0] = '\\';
					vol->UNC[1] = '\\';
				} else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
					printk(KERN_WARNING
					       "CIFS: UNC Path does not begin "
					       "with // or \\\\ \n");
					goto cifs_parse_mount_err;
				}
			} else {
				printk(KERN_WARNING "CIFS: UNC name too long\n");
				goto cifs_parse_mount_err;
			}
		} else if ((strnicmp(data, "domain", 3) == 0)
			   || (strnicmp(data, "workgroup", 5) == 0)) {
			if (!value || !*value) {
				printk(KERN_WARNING "CIFS: invalid domain name\n");
				goto cifs_parse_mount_err;
			}
			/* BB are there cases in which a comma can be valid in
			a domain name and need special handling? */
			if (strnlen(value, 256) < 256) {
				vol->domainname = kstrdup(value, GFP_KERNEL);
				if (!vol->domainname) {
					printk(KERN_WARNING "CIFS: no memory "
							    "for domainname\n");
					goto cifs_parse_mount_err;
				}
				cFYI(1, "Domain name set");
			} else {
				printk(KERN_WARNING "CIFS: domain name too "
						    "long\n");
				goto cifs_parse_mount_err;
			}
		} else if (strnicmp(data, "srcaddr", 7) == 0) {
			vol->srcaddr.ss_family = AF_UNSPEC;

			if (!value || !*value) {
				printk(KERN_WARNING "CIFS: srcaddr value"
				       " not specified.\n");
				goto cifs_parse_mount_err;
			}
			i = cifs_convert_address((struct sockaddr *)&vol->srcaddr,
						 value, strlen(value));
			if (i == 0) {
				printk(KERN_WARNING "CIFS:  Could not parse"
				       " srcaddr: %s\n",
				       value);
				goto cifs_parse_mount_err;
			}
		} else if (strnicmp(data, "prefixpath", 10) == 0) {
			if (!value || !*value) {
				printk(KERN_WARNING
					"CIFS: invalid path prefix\n");
				goto cifs_parse_mount_err;
			}
			if ((temp_len = strnlen(value, 1024)) < 1024) {
				if (value[0] != '/')
					temp_len++;  /* missing leading slash */
				vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
				if (vol->prepath == NULL)
					goto cifs_parse_mount_err;
				if (value[0] != '/') {
					vol->prepath[0] = '/';
					strcpy(vol->prepath+1, value);
				} else
					strcpy(vol->prepath, value);
				cFYI(1, "prefix path %s", vol->prepath);
			} else {
				printk(KERN_WARNING "CIFS: prefix too long\n");
				goto cifs_parse_mount_err;
			}
		} else if (strnicmp(data, "iocharset", 9) == 0) {
			if (!value || !*value) {
				printk(KERN_WARNING "CIFS: invalid iocharset "
						    "specified\n");
				goto cifs_parse_mount_err;
			}
			if (strnlen(value, 65) < 65) {
				if (strnicmp(value, "default", 7)) {
					vol->iocharset = kstrdup(value,
								 GFP_KERNEL);

					if (!vol->iocharset) {
						printk(KERN_WARNING "CIFS: no "
								   "memory for"
								   "charset\n");
						goto cifs_parse_mount_err;
					}
				}
				/* if iocharset not set then load_nls_default
				   is used by caller */
				cFYI(1, "iocharset set to %s", value);
			} else {
				printk(KERN_WARNING "CIFS: iocharset name "
						    "too long.\n");
				goto cifs_parse_mount_err;
			}
		} else if (!strnicmp(data, "uid", 3) && value && *value) {
			vol->linux_uid = simple_strtoul(value, &value, 0);
			uid_specified = true;
		} else if (!strnicmp(data, "cruid", 5) && value && *value) {
			vol->cred_uid = simple_strtoul(value, &value, 0);
		} else if (!strnicmp(data, "forceuid", 8)) {
			override_uid = 1;
		} else if (!strnicmp(data, "noforceuid", 10)) {
			override_uid = 0;
		} else if (!strnicmp(data, "gid", 3) && value && *value) {
			vol->linux_gid = simple_strtoul(value, &value, 0);
			gid_specified = true;
		} else if (!strnicmp(data, "forcegid", 8)) {
			override_gid = 1;
		} else if (!strnicmp(data, "noforcegid", 10)) {
			override_gid = 0;
		} else if (strnicmp(data, "file_mode", 4) == 0) {
			if (value && *value) {
				vol->file_mode =
					simple_strtoul(value, &value, 0);
			}
		} else if (strnicmp(data, "dir_mode", 4) == 0) {
			if (value && *value) {
				vol->dir_mode =
					simple_strtoul(value, &value, 0);
			}
		} else if (strnicmp(data, "dirmode", 4) == 0) {
			if (value && *value) {
				vol->dir_mode =
					simple_strtoul(value, &value, 0);
			}
		} else if (strnicmp(data, "port", 4) == 0) {
			if (value && *value) {
				vol->port =
					simple_strtoul(value, &value, 0);
			}
		} else if (strnicmp(data, "rsize", 5) == 0) {
			if (value && *value) {
				vol->rsize =
					simple_strtoul(value, &value, 0);
			}
		} else if (strnicmp(data, "wsize", 5) == 0) {
			if (value && *value) {
				vol->wsize =
					simple_strtoul(value, &value, 0);
			}
		} else if (strnicmp(data, "sockopt", 5) == 0) {
			if (!value || !*value) {
				cERROR(1, "no socket option specified");
				continue;
			} else if (strnicmp(value, "TCP_NODELAY", 11) == 0) {
				vol->sockopt_tcp_nodelay = 1;
			}
		} else if (strnicmp(data, "netbiosname", 4) == 0) {
			if (!value || !*value || (*value == ' ')) {
				cFYI(1, "invalid (empty) netbiosname");
			} else {
				memset(vol->source_rfc1001_name, 0x20,
					RFC1001_NAME_LEN);
				/*
				 * FIXME: are there cases in which a comma can
				 * be valid in workstation netbios name (and
				 * need special handling)?
				 */
				for (i = 0; i < RFC1001_NAME_LEN; i++) {
					/* don't ucase netbiosname for user */
					if (value[i] == 0)
						break;
					vol->source_rfc1001_name[i] = value[i];
				}
				/* The string has 16th byte zero still from
				set at top of the function  */
				if (i == RFC1001_NAME_LEN && value[i] != 0)
					printk(KERN_WARNING "CIFS: netbiosname"
						" longer than 15 truncated.\n");
			}
		} else if (strnicmp(data, "servern", 7) == 0) {
			/* servernetbiosname specified override *SMBSERVER */
			if (!value || !*value || (*value == ' ')) {
				cFYI(1, "empty server netbiosname specified");
			} else {
				/* last byte, type, is 0x20 for servr type */
				memset(vol->target_rfc1001_name, 0x20,
					RFC1001_NAME_LEN_WITH_NULL);

				for (i = 0; i < 15; i++) {
				/* BB are there cases in which a comma can be
				   valid in this workstation netbios name
				   (and need special handling)? */

				/* user or mount helper must uppercase
				   the netbiosname */
					if (value[i] == 0)
						break;
					else
						vol->target_rfc1001_name[i] =
								value[i];
				}
				/* The string has 16th byte zero still from
				   set at top of the function  */
				if (i == RFC1001_NAME_LEN && value[i] != 0)
					printk(KERN_WARNING "CIFS: server net"
					"biosname longer than 15 truncated.\n");
			}
		} else if (strnicmp(data, "actimeo", 7) == 0) {
			if (value && *value) {
				vol->actimeo = HZ * simple_strtoul(value,
								   &value, 0);
				if (vol->actimeo > CIFS_MAX_ACTIMEO) {
					cERROR(1, "CIFS: attribute cache"
							"timeout too large");
					goto cifs_parse_mount_err;
				}
			}
		} else if (strnicmp(data, "credentials", 4) == 0) {
			/* ignore */
		} else if (strnicmp(data, "version", 3) == 0) {
			/* ignore */
		} else if (strnicmp(data, "guest", 5) == 0) {
			/* ignore */
		} else if (strnicmp(data, "rw", 2) == 0) {
			/* ignore */
		} else if (strnicmp(data, "ro", 2) == 0) {
			/* ignore */
		} else if (strnicmp(data, "noblocksend", 11) == 0) {
			vol->noblocksnd = 1;
		} else if (strnicmp(data, "noautotune", 10) == 0) {
			vol->noautotune = 1;
		} else if ((strnicmp(data, "suid", 4) == 0) ||
				   (strnicmp(data, "nosuid", 6) == 0) ||
				   (strnicmp(data, "exec", 4) == 0) ||
				   (strnicmp(data, "noexec", 6) == 0) ||
				   (strnicmp(data, "nodev", 5) == 0) ||
				   (strnicmp(data, "noauto", 6) == 0) ||
				   (strnicmp(data, "dev", 3) == 0)) {
			/*  The mount tool or mount.cifs helper (if present)
			    uses these opts to set flags, and the flags are read
			    by the kernel vfs layer before we get here (ie
			    before read super) so there is no point trying to
			    parse these options again and set anything and it
			    is ok to just ignore them */
			continue;
		} else if (strnicmp(data, "hard", 4) == 0) {
			vol->retry = 1;
		} else if (strnicmp(data, "soft", 4) == 0) {
			vol->retry = 0;
		} else if (strnicmp(data, "perm", 4) == 0) {
			vol->noperm = 0;
		} else if (strnicmp(data, "noperm", 6) == 0) {
			vol->noperm = 1;
		} else if (strnicmp(data, "mapchars", 8) == 0) {
			vol->remap = 1;
		} else if (strnicmp(data, "nomapchars", 10) == 0) {
			vol->remap = 0;
		} else if (strnicmp(data, "sfu", 3) == 0) {
			vol->sfu_emul = 1;
		} else if (strnicmp(data, "nosfu", 5) == 0) {
			vol->sfu_emul = 0;
		} else if (strnicmp(data, "nodfs", 5) == 0) {
			vol->nodfs = 1;
		} else if (strnicmp(data, "posixpaths", 10) == 0) {
			vol->posix_paths = 1;
		} else if (strnicmp(data, "noposixpaths", 12) == 0) {
			vol->posix_paths = 0;
		} else if (strnicmp(data, "nounix", 6) == 0) {
			vol->no_linux_ext = 1;
		} else if (strnicmp(data, "nolinux", 7) == 0) {
			vol->no_linux_ext = 1;
		} else if ((strnicmp(data, "nocase", 6) == 0) ||
			   (strnicmp(data, "ignorecase", 10)  == 0)) {
			vol->nocase = 1;
		} else if (strnicmp(data, "mand", 4) == 0) {
			/* ignore */
		} else if (strnicmp(data, "nomand", 6) == 0) {
			/* ignore */
		} else if (strnicmp(data, "_netdev", 7) == 0) {
			/* ignore */
		} else if (strnicmp(data, "brl", 3) == 0) {
			vol->nobrl =  0;
		} else if ((strnicmp(data, "nobrl", 5) == 0) ||
			   (strnicmp(data, "nolock", 6) == 0)) {
			vol->nobrl =  1;
			/* turn off mandatory locking in mode
			if remote locking is turned off since the
			local vfs will do advisory */
			if (vol->file_mode ==
				(S_IALLUGO & ~(S_ISUID | S_IXGRP)))
				vol->file_mode = S_IALLUGO;
		} else if (strnicmp(data, "forcemandatorylock", 9) == 0) {
			/* will take the shorter form "forcemand" as well */
			/* This mount option will force use of mandatory
			  (DOS/Windows style) byte range locks, instead of
			  using posix advisory byte range locks, even if the
			  Unix extensions are available and posix locks would
			  be supported otherwise. If Unix extensions are not
			  negotiated this has no effect since mandatory locks
			  would be used (mandatory locks is all that those
			  those servers support) */
			vol->mand_lock = 1;
		} else if (strnicmp(data, "setuids", 7) == 0) {
			vol->setuids = 1;
		} else if (strnicmp(data, "nosetuids", 9) == 0) {
			vol->setuids = 0;
		} else if (strnicmp(data, "dynperm", 7) == 0) {
			vol->dynperm = true;
		} else if (strnicmp(data, "nodynperm", 9) == 0) {
			vol->dynperm = false;
		} else if (strnicmp(data, "nohard", 6) == 0) {
			vol->retry = 0;
		} else if (strnicmp(data, "nosoft", 6) == 0) {
			vol->retry = 1;
		} else if (strnicmp(data, "nointr", 6) == 0) {
			vol->intr = 0;
		} else if (strnicmp(data, "intr", 4) == 0) {
			vol->intr = 1;
		} else if (strnicmp(data, "nostrictsync", 12) == 0) {
			vol->nostrictsync = 1;
		} else if (strnicmp(data, "strictsync", 10) == 0) {
			vol->nostrictsync = 0;
		} else if (strnicmp(data, "serverino", 7) == 0) {
			vol->server_ino = 1;
		} else if (strnicmp(data, "noserverino", 9) == 0) {
			vol->server_ino = 0;
		} else if (strnicmp(data, "rwpidforward", 4) == 0) {
			vol->rwpidforward = 1;
		} else if (strnicmp(data, "cifsacl", 7) == 0) {
			vol->cifs_acl = 1;
		} else if (strnicmp(data, "nocifsacl", 9) == 0) {
			vol->cifs_acl = 0;
		} else if (strnicmp(data, "acl", 3) == 0) {
			vol->no_psx_acl = 0;
		} else if (strnicmp(data, "noacl", 5) == 0) {
			vol->no_psx_acl = 1;
		} else if (strnicmp(data, "locallease", 6) == 0) {
			vol->local_lease = 1;
		} else if (strnicmp(data, "sign", 4) == 0) {
			vol->secFlg |= CIFSSEC_MUST_SIGN;
		} else if (strnicmp(data, "seal", 4) == 0) {
			/* we do not do the following in secFlags because seal
			   is a per tree connection (mount) not a per socket
			   or per-smb connection option in the protocol */
			/* vol->secFlg |= CIFSSEC_MUST_SEAL; */
			vol->seal = 1;
		} else if (strnicmp(data, "direct", 6) == 0) {
			vol->direct_io = 1;
		} else if (strnicmp(data, "forcedirectio", 13) == 0) {
			vol->direct_io = 1;
		} else if (strnicmp(data, "strictcache", 11) == 0) {
			vol->strict_io = 1;
		} else if (strnicmp(data, "noac", 4) == 0) {
			printk(KERN_WARNING "CIFS: Mount option noac not "
				"supported. Instead set "
				"/proc/fs/cifs/LookupCacheEnabled to 0\n");
		} else if (strnicmp(data, "fsc", 3) == 0) {
#ifndef CONFIG_CIFS_FSCACHE
			cERROR(1, "FS-Cache support needs CONFIG_CIFS_FSCACHE "
				  "kernel config option set");
			goto cifs_parse_mount_err;
#endif
			vol->fsc = true;
		} else if (strnicmp(data, "mfsymlinks", 10) == 0) {
			vol->mfsymlinks = true;
		} else if (strnicmp(data, "multiuser", 8) == 0) {
			vol->multiuser = true;
		} else
			printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
						data);
	}
	if (vol->UNC == NULL) {
		if (devname == NULL) {
			printk(KERN_WARNING "CIFS: Missing UNC name for mount "
						"target\n");
			goto cifs_parse_mount_err;
		}
		if ((temp_len = strnlen(devname, 300)) < 300) {
			vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
			if (vol->UNC == NULL)
				goto cifs_parse_mount_err;
			strcpy(vol->UNC, devname);
			if (strncmp(vol->UNC, "//", 2) == 0) {
				vol->UNC[0] = '\\';
				vol->UNC[1] = '\\';
			} else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
				printk(KERN_WARNING "CIFS: UNC Path does not "
						    "begin with // or \\\\ \n");
				goto cifs_parse_mount_err;
			}
			value = strpbrk(vol->UNC+2, "/\\");
			if (value)
				*value = '\\';
		} else {
			printk(KERN_WARNING "CIFS: UNC name too long\n");
			goto cifs_parse_mount_err;
		}
	}

	if (vol->multiuser && !(vol->secFlg & CIFSSEC_MAY_KRB5)) {
		cERROR(1, "Multiuser mounts currently require krb5 "
			  "authentication!");
		goto cifs_parse_mount_err;
	}

	if (vol->UNCip == NULL)
		vol->UNCip = &vol->UNC[2];

	if (uid_specified)
		vol->override_uid = override_uid;
	else if (override_uid == 1)
		printk(KERN_NOTICE "CIFS: ignoring forceuid mount option "
				   "specified with no uid= option.\n");

	if (gid_specified)
		vol->override_gid = override_gid;
	else if (override_gid == 1)
		printk(KERN_NOTICE "CIFS: ignoring forcegid mount option "
				   "specified with no gid= option.\n");

	kfree(mountdata_copy);
	return 0;

cifs_parse_mount_err:
	kfree(mountdata_copy);
	return 1;
}

/** Returns true if srcaddr isn't specified and rhs isn't
 * specified, or if srcaddr is specified and
 * matches the IP address of the rhs argument.
 */
static bool
srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
{
	switch (srcaddr->sa_family) {
	case AF_UNSPEC:
		return (rhs->sa_family == AF_UNSPEC);
	case AF_INET: {
		struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
		struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
		return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
	}
	case AF_INET6: {
		struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
		struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)&rhs;
		return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
	}
	default:
		WARN_ON(1);
		return false; /* don't expect to be here */
	}
}

/*
 * If no port is specified in addr structure, we try to match with 445 port
 * and if it fails - with 139 ports. It should be called only if address
 * families of server and addr are equal.
 */
static bool
match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
{
	__be16 port, *sport;

	switch (addr->sa_family) {
	case AF_INET:
		sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
		port = ((struct sockaddr_in *) addr)->sin_port;
		break;
	case AF_INET6:
		sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
		port = ((struct sockaddr_in6 *) addr)->sin6_port;
		break;
	default:
		WARN_ON(1);
		return false;
	}

	if (!port) {
		port = htons(CIFS_PORT);
		if (port == *sport)
			return true;

		port = htons(RFC1001_PORT);
	}

	return port == *sport;
}

static bool
match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
	      struct sockaddr *srcaddr)
{
	switch (addr->sa_family) {
	case AF_INET: {
		struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
		struct sockaddr_in *srv_addr4 =
					(struct sockaddr_in *)&server->dstaddr;

		if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
			return false;
		break;
	}
	case AF_INET6: {
		struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
		struct sockaddr_in6 *srv_addr6 =
					(struct sockaddr_in6 *)&server->dstaddr;

		if (!ipv6_addr_equal(&addr6->sin6_addr,
				     &srv_addr6->sin6_addr))
			return false;
		if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
			return false;
		break;
	}
	default:
		WARN_ON(1);
		return false; /* don't expect to be here */
	}

	if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
		return false;

	return true;
}

static bool
match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
{
	unsigned int secFlags;

	if (vol->secFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
		secFlags = vol->secFlg;
	else
		secFlags = global_secflags | vol->secFlg;

	switch (server->secType) {
	case LANMAN:
		if (!(secFlags & (CIFSSEC_MAY_LANMAN|CIFSSEC_MAY_PLNTXT)))
			return false;
		break;
	case NTLMv2:
		if (!(secFlags & CIFSSEC_MAY_NTLMV2))
			return false;
		break;
	case NTLM:
		if (!(secFlags & CIFSSEC_MAY_NTLM))
			return false;
		break;
	case Kerberos:
		if (!(secFlags & CIFSSEC_MAY_KRB5))
			return false;
		break;
	case RawNTLMSSP:
		if (!(secFlags & CIFSSEC_MAY_NTLMSSP))
			return false;
		break;
	default:
		/* shouldn't happen */
		return false;
	}

	/* now check if signing mode is acceptable */
	if ((secFlags & CIFSSEC_MAY_SIGN) == 0 &&
	    (server->sec_mode & SECMODE_SIGN_REQUIRED))
			return false;
	else if (((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) &&
		 (server->sec_mode &
		  (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED)) == 0)
			return false;

	return true;
}

static int match_server(struct TCP_Server_Info *server, struct sockaddr *addr,
			 struct smb_vol *vol)
{
	if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
		return 0;

	if (!match_address(server, addr,
			   (struct sockaddr *)&vol->srcaddr))
		return 0;

	if (!match_port(server, addr))
		return 0;

	if (!match_security(server, vol))
		return 0;

	return 1;
}

static struct TCP_Server_Info *
cifs_find_tcp_session(struct sockaddr *addr, struct smb_vol *vol)
{
	struct TCP_Server_Info *server;

	spin_lock(&cifs_tcp_ses_lock);
	list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
		if (!match_server(server, addr, vol))
			continue;

		++server->srv_count;
		spin_unlock(&cifs_tcp_ses_lock);
		cFYI(1, "Existing tcp session with server found");
		return server;
	}
	spin_unlock(&cifs_tcp_ses_lock);
	return NULL;
}

static void
cifs_put_tcp_session(struct TCP_Server_Info *server)
{
	struct task_struct *task;

	spin_lock(&cifs_tcp_ses_lock);
	if (--server->srv_count > 0) {
		spin_unlock(&cifs_tcp_ses_lock);
		return;
	}

	put_net(cifs_net_ns(server));

	list_del_init(&server->tcp_ses_list);
	spin_unlock(&cifs_tcp_ses_lock);

	cancel_delayed_work_sync(&server->echo);

	spin_lock(&GlobalMid_Lock);
	server->tcpStatus = CifsExiting;
	spin_unlock(&GlobalMid_Lock);

	cifs_crypto_shash_release(server);
	cifs_fscache_release_client_cookie(server);

	kfree(server->session_key.response);
	server->session_key.response = NULL;
	server->session_key.len = 0;

	task = xchg(&server->tsk, NULL);
	if (task)
		force_sig(SIGKILL, task);
}

static struct TCP_Server_Info *
cifs_get_tcp_session(struct smb_vol *volume_info)
{
	struct TCP_Server_Info *tcp_ses = NULL;
	struct sockaddr_storage addr;
	struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
	struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
	int rc;

	memset(&addr, 0, sizeof(struct sockaddr_storage));

	cFYI(1, "UNC: %s ip: %s", volume_info->UNC, volume_info->UNCip);

	if (volume_info->UNCip && volume_info->UNC) {
		rc = cifs_fill_sockaddr((struct sockaddr *)&addr,
					volume_info->UNCip,
					strlen(volume_info->UNCip),
					volume_info->port);
		if (!rc) {
			/* we failed translating address */
			rc = -EINVAL;
			goto out_err;
		}
	} else if (volume_info->UNCip) {
		/* BB using ip addr as tcp_ses name to connect to the
		   DFS root below */
		cERROR(1, "Connecting to DFS root not implemented yet");
		rc = -EINVAL;
		goto out_err;
	} else /* which tcp_sess DFS root would we conect to */ {
		cERROR(1, "CIFS mount error: No UNC path (e.g. -o "
			"unc=//192.168.1.100/public) specified");
		rc = -EINVAL;
		goto out_err;
	}

	/* see if we already have a matching tcp_ses */
	tcp_ses = cifs_find_tcp_session((struct sockaddr *)&addr, volume_info);
	if (tcp_ses)
		return tcp_ses;

	tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
	if (!tcp_ses) {
		rc = -ENOMEM;
		goto out_err;
	}

	rc = cifs_crypto_shash_allocate(tcp_ses);
	if (rc) {
		cERROR(1, "could not setup hash structures rc %d", rc);
		goto out_err;
	}

	cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
	tcp_ses->hostname = extract_hostname(volume_info->UNC);
	if (IS_ERR(tcp_ses->hostname)) {
		rc = PTR_ERR(tcp_ses->hostname);
		goto out_err_crypto_release;
	}

	tcp_ses->noblocksnd = volume_info->noblocksnd;
	tcp_ses->noautotune = volume_info->noautotune;
	tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
	atomic_set(&tcp_ses->inFlight, 0);
	init_waitqueue_head(&tcp_ses->response_q);
	init_waitqueue_head(&tcp_ses->request_q);
	INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
	mutex_init(&tcp_ses->srv_mutex);
	memcpy(tcp_ses->workstation_RFC1001_name,
		volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
	memcpy(tcp_ses->server_RFC1001_name,
		volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
	tcp_ses->session_estab = false;
	tcp_ses->sequence_number = 0;
	tcp_ses->lstrp = jiffies;
	INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
	INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
	INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);

	/*
	 * at this point we are the only ones with the pointer
	 * to the struct since the kernel thread not created yet
	 * no need to spinlock this init of tcpStatus or srv_count
	 */
	tcp_ses->tcpStatus = CifsNew;
	memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
	       sizeof(tcp_ses->srcaddr));
	++tcp_ses->srv_count;

	if (addr.ss_family == AF_INET6) {
		cFYI(1, "attempting ipv6 connect");
		/* BB should we allow ipv6 on port 139? */
		/* other OS never observed in Wild doing 139 with v6 */
		memcpy(&tcp_ses->dstaddr, sin_server6,
		       sizeof(struct sockaddr_in6));
	} else
		memcpy(&tcp_ses->dstaddr, sin_server,
		       sizeof(struct sockaddr_in));

	rc = ip_connect(tcp_ses);
	if (rc < 0) {
		cERROR(1, "Error connecting to socket. Aborting operation");
		goto out_err_crypto_release;
	}

	/*
	 * since we're in a cifs function already, we know that
	 * this will succeed. No need for try_module_get().
	 */
	__module_get(THIS_MODULE);
	tcp_ses->tsk = kthread_run((void *)(void *)cifs_demultiplex_thread,
				  tcp_ses, "cifsd");
	if (IS_ERR(tcp_ses->tsk)) {
		rc = PTR_ERR(tcp_ses->tsk);
		cERROR(1, "error %d create cifsd thread", rc);
		module_put(THIS_MODULE);
		goto out_err_crypto_release;
	}
	tcp_ses->tcpStatus = CifsNeedNegotiate;

	/* thread spawned, put it on the list */
	spin_lock(&cifs_tcp_ses_lock);
	list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
	spin_unlock(&cifs_tcp_ses_lock);

	cifs_fscache_get_client_cookie(tcp_ses);

	/* queue echo request delayed work */
	queue_delayed_work(system_nrt_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL);

	return tcp_ses;

out_err_crypto_release:
	cifs_crypto_shash_release(tcp_ses);

	put_net(cifs_net_ns(tcp_ses));

out_err:
	if (tcp_ses) {
		if (!IS_ERR(tcp_ses->hostname))
			kfree(tcp_ses->hostname);
		if (tcp_ses->ssocket)
			sock_release(tcp_ses->ssocket);
		kfree(tcp_ses);
	}
	return ERR_PTR(rc);
}

static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
{
	switch (ses->server->secType) {
	case Kerberos:
		if (vol->cred_uid != ses->cred_uid)
			return 0;
		break;
	default:
		/* anything else takes username/password */
		if (ses->user_name == NULL)
			return 0;
		if (strncmp(ses->user_name, vol->username,
			    MAX_USERNAME_SIZE))
			return 0;
		if (strlen(vol->username) != 0 &&
		    ses->password != NULL &&
		    strncmp(ses->password,
			    vol->password ? vol->password : "",
			    MAX_PASSWORD_SIZE))
			return 0;
	}
	return 1;
}

static struct cifs_ses *
cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
{
	struct cifs_ses *ses;

	spin_lock(&cifs_tcp_ses_lock);
	list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
		if (!match_session(ses, vol))
			continue;
		++ses->ses_count;
		spin_unlock(&cifs_tcp_ses_lock);
		return ses;
	}
	spin_unlock(&cifs_tcp_ses_lock);
	return NULL;
}

static void
cifs_put_smb_ses(struct cifs_ses *ses)
{
	int xid;
	struct TCP_Server_Info *server = ses->server;

	cFYI(1, "%s: ses_count=%d\n", __func__, ses->ses_count);
	spin_lock(&cifs_tcp_ses_lock);
	if (--ses->ses_count > 0) {
		spin_unlock(&cifs_tcp_ses_lock);
		return;
	}

	list_del_init(&ses->smb_ses_list);
	spin_unlock(&cifs_tcp_ses_lock);

	if (ses->status == CifsGood) {
		xid = GetXid();
		CIFSSMBLogoff(xid, ses);
		_FreeXid(xid);
	}
	sesInfoFree(ses);
	cifs_put_tcp_session(server);
}

static bool warned_on_ntlm;  /* globals init to false automatically */

static struct cifs_ses *
cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
{
	int rc = -ENOMEM, xid;
	struct cifs_ses *ses;
	struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
	struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;

	xid = GetXid();

	ses = cifs_find_smb_ses(server, volume_info);
	if (ses) {
		cFYI(1, "Existing smb sess found (status=%d)", ses->status);

		mutex_lock(&ses->session_mutex);
		rc = cifs_negotiate_protocol(xid, ses);
		if (rc) {
			mutex_unlock(&ses->session_mutex);
			/* problem -- put our ses reference */
			cifs_put_smb_ses(ses);
			FreeXid(xid);
			return ERR_PTR(rc);
		}
		if (ses->need_reconnect) {
			cFYI(1, "Session needs reconnect");
			rc = cifs_setup_session(xid, ses,
						volume_info->local_nls);
			if (rc) {
				mutex_unlock(&ses->session_mutex);
				/* problem -- put our reference */
				cifs_put_smb_ses(ses);
				FreeXid(xid);
				return ERR_PTR(rc);
			}
		}
		mutex_unlock(&ses->session_mutex);

		/* existing SMB ses has a server reference already */
		cifs_put_tcp_session(server);
		FreeXid(xid);
		return ses;
	}

	cFYI(1, "Existing smb sess not found");
	ses = sesInfoAlloc();
	if (ses == NULL)
		goto get_ses_fail;

	/* new SMB session uses our server ref */
	ses->server = server;
	if (server->dstaddr.ss_family == AF_INET6)
		sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
	else
		sprintf(ses->serverName, "%pI4", &addr->sin_addr);

	if (volume_info->username) {
		ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
		if (!ses->user_name)
			goto get_ses_fail;
	}

	/* volume_info->password freed at unmount */
	if (volume_info->password) {
		ses->password = kstrdup(volume_info->password, GFP_KERNEL);
		if (!ses->password)
			goto get_ses_fail;
	}
	if (volume_info->domainname) {
		ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
		if (!ses->domainName)
			goto get_ses_fail;
	}
	ses->cred_uid = volume_info->cred_uid;
	ses->linux_uid = volume_info->linux_uid;

	/* ntlmv2 is much stronger than ntlm security, and has been broadly
	supported for many years, time to update default security mechanism */
	if ((volume_info->secFlg == 0) && warned_on_ntlm == false) {
		warned_on_ntlm = true;
		cERROR(1, "default security mechanism requested.  The default "
			"security mechanism will be upgraded from ntlm to "
			"ntlmv2 in kernel release 3.1");
	}
	ses->overrideSecFlg = volume_info->secFlg;

	mutex_lock(&ses->session_mutex);
	rc = cifs_negotiate_protocol(xid, ses);
	if (!rc)
		rc = cifs_setup_session(xid, ses, volume_info->local_nls);
	mutex_unlock(&ses->session_mutex);
	if (rc)
		goto get_ses_fail;

	/* success, put it on the list */
	spin_lock(&cifs_tcp_ses_lock);
	list_add(&ses->smb_ses_list, &server->smb_ses_list);
	spin_unlock(&cifs_tcp_ses_lock);

	FreeXid(xid);
	return ses;

get_ses_fail:
	sesInfoFree(ses);
	FreeXid(xid);
	return ERR_PTR(rc);
}

static int match_tcon(struct cifs_tcon *tcon, const char *unc)
{
	if (tcon->tidStatus == CifsExiting)
		return 0;
	if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
		return 0;
	return 1;
}

static struct cifs_tcon *
cifs_find_tcon(struct cifs_ses *ses, const char *unc)
{
	struct list_head *tmp;
	struct cifs_tcon *tcon;

	spin_lock(&cifs_tcp_ses_lock);
	list_for_each(tmp, &ses->tcon_list) {
		tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
		if (!match_tcon(tcon, unc))
			continue;
		++tcon->tc_count;
		spin_unlock(&cifs_tcp_ses_lock);
		return tcon;
	}
	spin_unlock(&cifs_tcp_ses_lock);
	return NULL;
}

static void
cifs_put_tcon(struct cifs_tcon *tcon)
{
	int xid;
	struct cifs_ses *ses = tcon->ses;

	cFYI(1, "%s: tc_count=%d\n", __func__, tcon->tc_count);
	spin_lock(&cifs_tcp_ses_lock);
	if (--tcon->tc_count > 0) {
		spin_unlock(&cifs_tcp_ses_lock);
		return;
	}

	list_del_init(&tcon->tcon_list);
	spin_unlock(&cifs_tcp_ses_lock);

	xid = GetXid();
	CIFSSMBTDis(xid, tcon);
	_FreeXid(xid);

	cifs_fscache_release_super_cookie(tcon);
	tconInfoFree(tcon);
	cifs_put_smb_ses(ses);
}

static struct cifs_tcon *
cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
{
	int rc, xid;
	struct cifs_tcon *tcon;

	tcon = cifs_find_tcon(ses, volume_info->UNC);
	if (tcon) {
		cFYI(1, "Found match on UNC path");
		/* existing tcon already has a reference */
		cifs_put_smb_ses(ses);
		if (tcon->seal != volume_info->seal)
			cERROR(1, "transport encryption setting "
				   "conflicts with existing tid");
		return tcon;
	}

	tcon = tconInfoAlloc();
	if (tcon == NULL) {
		rc = -ENOMEM;
		goto out_fail;
	}

	tcon->ses = ses;
	if (volume_info->password) {
		tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
		if (!tcon->password) {
			rc = -ENOMEM;
			goto out_fail;
		}
	}

	if (strchr(volume_info->UNC + 3, '\\') == NULL
	    && strchr(volume_info->UNC + 3, '/') == NULL) {
		cERROR(1, "Missing share name");
		rc = -ENODEV;
		goto out_fail;
	}

	/* BB Do we need to wrap session_mutex around
	 * this TCon call and Unix SetFS as
	 * we do on SessSetup and reconnect? */
	xid = GetXid();
	rc = CIFSTCon(xid, ses, volume_info->UNC, tcon, volume_info->local_nls);
	FreeXid(xid);
	cFYI(1, "CIFS Tcon rc = %d", rc);
	if (rc)
		goto out_fail;

	if (volume_info->nodfs) {
		tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
		cFYI(1, "DFS disabled (%d)", tcon->Flags);
	}
	tcon->seal = volume_info->seal;
	/* we can have only one retry value for a connection
	   to a share so for resources mounted more than once
	   to the same server share the last value passed in
	   for the retry flag is used */
	tcon->retry = volume_info->retry;
	tcon->nocase = volume_info->nocase;
	tcon->local_lease = volume_info->local_lease;

	spin_lock(&cifs_tcp_ses_lock);
	list_add(&tcon->tcon_list, &ses->tcon_list);
	spin_unlock(&cifs_tcp_ses_lock);

	cifs_fscache_get_super_cookie(tcon);

	return tcon;

out_fail:
	tconInfoFree(tcon);
	return ERR_PTR(rc);
}

void
cifs_put_tlink(struct tcon_link *tlink)
{
	if (!tlink || IS_ERR(tlink))
		return;

	if (!atomic_dec_and_test(&tlink->tl_count) ||
	    test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
		tlink->tl_time = jiffies;
		return;
	}

	if (!IS_ERR(tlink_tcon(tlink)))
		cifs_put_tcon(tlink_tcon(tlink));
	kfree(tlink);
	return;
}

static inline struct tcon_link *
cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
{
	return cifs_sb->master_tlink;
}

static int
compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
{
	struct cifs_sb_info *old = CIFS_SB(sb);
	struct cifs_sb_info *new = mnt_data->cifs_sb;

	if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
		return 0;

	if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
	    (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
		return 0;

	if (old->rsize != new->rsize)
		return 0;

	/*
	 * We want to share sb only if we don't specify wsize or specified wsize
	 * is greater or equal than existing one.
	 */
	if (new->wsize && new->wsize < old->wsize)
		return 0;

	if (old->mnt_uid != new->mnt_uid || old->mnt_gid != new->mnt_gid)
		return 0;

	if (old->mnt_file_mode != new->mnt_file_mode ||
	    old->mnt_dir_mode != new->mnt_dir_mode)
		return 0;

	if (strcmp(old->local_nls->charset, new->local_nls->charset))
		return 0;

	if (old->actimeo != new->actimeo)
		return 0;

	return 1;
}

int
cifs_match_super(struct super_block *sb, void *data)
{
	struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
	struct smb_vol *volume_info;
	struct cifs_sb_info *cifs_sb;
	struct TCP_Server_Info *tcp_srv;
	struct cifs_ses *ses;
	struct cifs_tcon *tcon;
	struct tcon_link *tlink;
	struct sockaddr_storage addr;
	int rc = 0;

	memset(&addr, 0, sizeof(struct sockaddr_storage));

	spin_lock(&cifs_tcp_ses_lock);
	cifs_sb = CIFS_SB(sb);
	tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
	if (IS_ERR(tlink)) {
		spin_unlock(&cifs_tcp_ses_lock);
		return rc;
	}
	tcon = tlink_tcon(tlink);
	ses = tcon->ses;
	tcp_srv = ses->server;

	volume_info = mnt_data->vol;

	if (!volume_info->UNCip || !volume_info->UNC)
		goto out;

	rc = cifs_fill_sockaddr((struct sockaddr *)&addr,
				volume_info->UNCip,
				strlen(volume_info->UNCip),
				volume_info->port);
	if (!rc)
		goto out;

	if (!match_server(tcp_srv, (struct sockaddr *)&addr, volume_info) ||
	    !match_session(ses, volume_info) ||
	    !match_tcon(tcon, volume_info->UNC)) {
		rc = 0;
		goto out;
	}

	rc = compare_mount_options(sb, mnt_data);
out:
	cifs_put_tlink(tlink);
	spin_unlock(&cifs_tcp_ses_lock);
	return rc;
}

int
get_dfs_path(int xid, struct cifs_ses *pSesInfo, const char *old_path,
	     const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
	     struct dfs_info3_param **preferrals, int remap)
{
	char *temp_unc;
	int rc = 0;

	*pnum_referrals = 0;
	*preferrals = NULL;

	if (pSesInfo->ipc_tid == 0) {
		temp_unc = kmalloc(2 /* for slashes */ +
			strnlen(pSesInfo->serverName,
				SERVER_NAME_LEN_WITH_NULL * 2)
				 + 1 + 4 /* slash IPC$ */  + 2,
				GFP_KERNEL);
		if (temp_unc == NULL)
			return -ENOMEM;
		temp_unc[0] = '\\';
		temp_unc[1] = '\\';
		strcpy(temp_unc + 2, pSesInfo->serverName);
		strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
		rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
		cFYI(1, "CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid);
		kfree(temp_unc);
	}
	if (rc == 0)
		rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
				     pnum_referrals, nls_codepage, remap);
	/* BB map targetUNCs to dfs_info3 structures, here or
		in CIFSGetDFSRefer BB */

	return rc;
}

#ifdef CONFIG_DEBUG_LOCK_ALLOC
static struct lock_class_key cifs_key[2];
static struct lock_class_key cifs_slock_key[2];

static inline void
cifs_reclassify_socket4(struct socket *sock)
{
	struct sock *sk = sock->sk;
	BUG_ON(sock_owned_by_user(sk));
	sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
		&cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
}

static inline void
cifs_reclassify_socket6(struct socket *sock)
{
	struct sock *sk = sock->sk;
	BUG_ON(sock_owned_by_user(sk));
	sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
		&cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
}
#else
static inline void
cifs_reclassify_socket4(struct socket *sock)
{
}

static inline void
cifs_reclassify_socket6(struct socket *sock)
{
}
#endif

/* See RFC1001 section 14 on representation of Netbios names */
static void rfc1002mangle(char *target, char *source, unsigned int length)
{
	unsigned int i, j;

	for (i = 0, j = 0; i < (length); i++) {
		/* mask a nibble at a time and encode */
		target[j] = 'A' + (0x0F & (source[i] >> 4));
		target[j+1] = 'A' + (0x0F & source[i]);
		j += 2;
	}

}

static int
bind_socket(struct TCP_Server_Info *server)
{
	int rc = 0;
	if (server->srcaddr.ss_family != AF_UNSPEC) {
		/* Bind to the specified local IP address */
		struct socket *socket = server->ssocket;
		rc = socket->ops->bind(socket,
				       (struct sockaddr *) &server->srcaddr,
				       sizeof(server->srcaddr));
		if (rc < 0) {
			struct sockaddr_in *saddr4;
			struct sockaddr_in6 *saddr6;
			saddr4 = (struct sockaddr_in *)&server->srcaddr;
			saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
			if (saddr6->sin6_family == AF_INET6)
				cERROR(1, "cifs: "
				       "Failed to bind to: %pI6c, error: %d\n",
				       &saddr6->sin6_addr, rc);
			else
				cERROR(1, "cifs: "
				       "Failed to bind to: %pI4, error: %d\n",
				       &saddr4->sin_addr.s_addr, rc);
		}
	}
	return rc;
}

static int
ip_rfc1001_connect(struct TCP_Server_Info *server)
{
	int rc = 0;
	/*
	 * some servers require RFC1001 sessinit before sending
	 * negprot - BB check reconnection in case where second
	 * sessinit is sent but no second negprot
	 */
	struct rfc1002_session_packet *ses_init_buf;
	struct smb_hdr *smb_buf;
	ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
			       GFP_KERNEL);
	if (ses_init_buf) {
		ses_init_buf->trailer.session_req.called_len = 32;

		if (server->server_RFC1001_name &&
		    server->server_RFC1001_name[0] != 0)
			rfc1002mangle(ses_init_buf->trailer.
				      session_req.called_name,
				      server->server_RFC1001_name,
				      RFC1001_NAME_LEN_WITH_NULL);
		else
			rfc1002mangle(ses_init_buf->trailer.
				      session_req.called_name,
				      DEFAULT_CIFS_CALLED_NAME,
				      RFC1001_NAME_LEN_WITH_NULL);

		ses_init_buf->trailer.session_req.calling_len = 32;

		/*
		 * calling name ends in null (byte 16) from old smb
		 * convention.
		 */
		if (server->workstation_RFC1001_name &&
		    server->workstation_RFC1001_name[0] != 0)
			rfc1002mangle(ses_init_buf->trailer.
				      session_req.calling_name,
				      server->workstation_RFC1001_name,
				      RFC1001_NAME_LEN_WITH_NULL);
		else
			rfc1002mangle(ses_init_buf->trailer.
				      session_req.calling_name,
				      "LINUX_CIFS_CLNT",
				      RFC1001_NAME_LEN_WITH_NULL);

		ses_init_buf->trailer.session_req.scope1 = 0;
		ses_init_buf->trailer.session_req.scope2 = 0;
		smb_buf = (struct smb_hdr *)ses_init_buf;

		/* sizeof RFC1002_SESSION_REQUEST with no scope */
		smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
		rc = smb_send(server, smb_buf, 0x44);
		kfree(ses_init_buf);
		/*
		 * RFC1001 layer in at least one server
		 * requires very short break before negprot
		 * presumably because not expecting negprot
		 * to follow so fast.  This is a simple
		 * solution that works without
		 * complicating the code and causes no
		 * significant slowing down on mount
		 * for everyone else
		 */
		usleep_range(1000, 2000);
	}
	/*
	 * else the negprot may still work without this
	 * even though malloc failed
	 */

	return rc;
}

static int
generic_ip_connect(struct TCP_Server_Info *server)
{
	int rc = 0;
	__be16 sport;
	int slen, sfamily;
	struct socket *socket = server->ssocket;
	struct sockaddr *saddr;

	saddr = (struct sockaddr *) &server->dstaddr;

	if (server->dstaddr.ss_family == AF_INET6) {
		sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
		slen = sizeof(struct sockaddr_in6);
		sfamily = AF_INET6;
	} else {
		sport = ((struct sockaddr_in *) saddr)->sin_port;
		slen = sizeof(struct sockaddr_in);
		sfamily = AF_INET;
	}

	if (socket == NULL) {
		rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
				   IPPROTO_TCP, &socket, 1);
		if (rc < 0) {
			cERROR(1, "Error %d creating socket", rc);
			server->ssocket = NULL;
			return rc;
		}

		/* BB other socket options to set KEEPALIVE, NODELAY? */
		cFYI(1, "Socket created");
		server->ssocket = socket;
		socket->sk->sk_allocation = GFP_NOFS;
		if (sfamily == AF_INET6)
			cifs_reclassify_socket6(socket);
		else
			cifs_reclassify_socket4(socket);
	}

	rc = bind_socket(server);
	if (rc < 0)
		return rc;

	rc = socket->ops->connect(socket, saddr, slen, 0);
	if (rc < 0) {
		cFYI(1, "Error %d connecting to server", rc);
		sock_release(socket);
		server->ssocket = NULL;
		return rc;
	}

	/*
	 * Eventually check for other socket options to change from
	 * the default. sock_setsockopt not used because it expects
	 * user space buffer
	 */
	socket->sk->sk_rcvtimeo = 7 * HZ;
	socket->sk->sk_sndtimeo = 5 * HZ;

	/* make the bufsizes depend on wsize/rsize and max requests */
	if (server->noautotune) {
		if (socket->sk->sk_sndbuf < (200 * 1024))
			socket->sk->sk_sndbuf = 200 * 1024;
		if (socket->sk->sk_rcvbuf < (140 * 1024))
			socket->sk->sk_rcvbuf = 140 * 1024;
	}

	if (server->tcp_nodelay) {
		int val = 1;
		rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
				(char *)&val, sizeof(val));
		if (rc)
			cFYI(1, "set TCP_NODELAY socket option error %d", rc);
	}

	 cFYI(1, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
		 socket->sk->sk_sndbuf,
		 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);

	if (sport == htons(RFC1001_PORT))
		rc = ip_rfc1001_connect(server);

	return rc;
}

static int
ip_connect(struct TCP_Server_Info *server)
{
	__be16 *sport;
	struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
	struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;

	if (server->dstaddr.ss_family == AF_INET6)
		sport = &addr6->sin6_port;
	else
		sport = &addr->sin_port;

	if (*sport == 0) {
		int rc;

		/* try with 445 port at first */
		*sport = htons(CIFS_PORT);

		rc = generic_ip_connect(server);
		if (rc >= 0)
			return rc;

		/* if it failed, try with 139 port */
		*sport = htons(RFC1001_PORT);
	}

	return generic_ip_connect(server);
}

void reset_cifs_unix_caps(int xid, struct cifs_tcon *tcon,
			  struct super_block *sb, struct smb_vol *vol_info)
{
	/* if we are reconnecting then should we check to see if
	 * any requested capabilities changed locally e.g. via
	 * remount but we can not do much about it here
	 * if they have (even if we could detect it by the following)
	 * Perhaps we could add a backpointer to array of sb from tcon
	 * or if we change to make all sb to same share the same
	 * sb as NFS - then we only have one backpointer to sb.
	 * What if we wanted to mount the server share twice once with
	 * and once without posixacls or posix paths? */
	__u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);

	if (vol_info && vol_info->no_linux_ext) {
		tcon->fsUnixInfo.Capability = 0;
		tcon->unix_ext = 0; /* Unix Extensions disabled */
		cFYI(1, "Linux protocol extensions disabled");
		return;
	} else if (vol_info)
		tcon->unix_ext = 1; /* Unix Extensions supported */

	if (tcon->unix_ext == 0) {
		cFYI(1, "Unix extensions disabled so not set on reconnect");
		return;
	}

	if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
		__u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
		cFYI(1, "unix caps which server supports %lld", cap);
		/* check for reconnect case in which we do not
		   want to change the mount behavior if we can avoid it */
		if (vol_info == NULL) {
			/* turn off POSIX ACL and PATHNAMES if not set
			   originally at mount time */
			if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
				cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
			if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
				if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
					cERROR(1, "POSIXPATH support change");
				cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
			} else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
				cERROR(1, "possible reconnect error");
				cERROR(1, "server disabled POSIX path support");
			}
		}

		if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
			cERROR(1, "per-share encryption not supported yet");

		cap &= CIFS_UNIX_CAP_MASK;
		if (vol_info && vol_info->no_psx_acl)
			cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
		else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
			cFYI(1, "negotiated posix acl support");
			if (sb)
				sb->s_flags |= MS_POSIXACL;
		}

		if (vol_info && vol_info->posix_paths == 0)
			cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
		else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
			cFYI(1, "negotiate posix pathnames");
			if (sb)
				CIFS_SB(sb)->mnt_cifs_flags |=
					CIFS_MOUNT_POSIX_PATHS;
		}

		if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) {
			if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
				CIFS_SB(sb)->rsize = 127 * 1024;
				cFYI(DBG2, "larger reads not supported by srv");
			}
		}


		cFYI(1, "Negotiate caps 0x%x", (int)cap);
#ifdef CONFIG_CIFS_DEBUG2
		if (cap & CIFS_UNIX_FCNTL_CAP)
			cFYI(1, "FCNTL cap");
		if (cap & CIFS_UNIX_EXTATTR_CAP)
			cFYI(1, "EXTATTR cap");
		if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
			cFYI(1, "POSIX path cap");
		if (cap & CIFS_UNIX_XATTR_CAP)
			cFYI(1, "XATTR cap");
		if (cap & CIFS_UNIX_POSIX_ACL_CAP)
			cFYI(1, "POSIX ACL cap");
		if (cap & CIFS_UNIX_LARGE_READ_CAP)
			cFYI(1, "very large read cap");
		if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
			cFYI(1, "very large write cap");
		if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
			cFYI(1, "transport encryption cap");
		if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
			cFYI(1, "mandatory transport encryption cap");
#endif /* CIFS_DEBUG2 */
		if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
			if (vol_info == NULL) {
				cFYI(1, "resetting capabilities failed");
			} else
				cERROR(1, "Negotiating Unix capabilities "
					   "with the server failed.  Consider "
					   "mounting with the Unix Extensions\n"
					   "disabled, if problems are found, "
					   "by specifying the nounix mount "
					   "option.");

		}
	}
}

void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
			struct cifs_sb_info *cifs_sb)
{
	INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);

	if (pvolume_info->rsize > CIFSMaxBufSize) {
		cERROR(1, "rsize %d too large, using MaxBufSize",
			pvolume_info->rsize);
		cifs_sb->rsize = CIFSMaxBufSize;
	} else if ((pvolume_info->rsize) &&
			(pvolume_info->rsize <= CIFSMaxBufSize))
		cifs_sb->rsize = pvolume_info->rsize;
	else /* default */
		cifs_sb->rsize = CIFSMaxBufSize;

	if (cifs_sb->rsize < 2048) {
		cifs_sb->rsize = 2048;
		/* Windows ME may prefer this */
		cFYI(1, "readsize set to minimum: 2048");
	}

	/*
	 * Temporarily set wsize for matching superblock. If we end up using
	 * new sb then cifs_negotiate_wsize will later negotiate it downward
	 * if needed.
	 */
	cifs_sb->wsize = pvolume_info->wsize;

	cifs_sb->mnt_uid = pvolume_info->linux_uid;
	cifs_sb->mnt_gid = pvolume_info->linux_gid;
	cifs_sb->mnt_file_mode = pvolume_info->file_mode;
	cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
	cFYI(1, "file mode: 0x%x  dir mode: 0x%x",
		cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);

	cifs_sb->actimeo = pvolume_info->actimeo;
	cifs_sb->local_nls = pvolume_info->local_nls;

	if (pvolume_info->noperm)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
	if (pvolume_info->setuids)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
	if (pvolume_info->server_ino)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
	if (pvolume_info->remap)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
	if (pvolume_info->no_xattr)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
	if (pvolume_info->sfu_emul)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
	if (pvolume_info->nobrl)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
	if (pvolume_info->nostrictsync)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
	if (pvolume_info->mand_lock)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
	if (pvolume_info->rwpidforward)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
	if (pvolume_info->cifs_acl)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
	if (pvolume_info->override_uid)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
	if (pvolume_info->override_gid)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
	if (pvolume_info->dynperm)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
	if (pvolume_info->fsc)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
	if (pvolume_info->multiuser)
		cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
					    CIFS_MOUNT_NO_PERM);
	if (pvolume_info->strict_io)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
	if (pvolume_info->direct_io) {
		cFYI(1, "mounting share using direct i/o");
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
	}
	if (pvolume_info->mfsymlinks) {
		if (pvolume_info->sfu_emul) {
			cERROR(1,  "mount option mfsymlinks ignored if sfu "
				   "mount option is used");
		} else {
			cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
		}
	}

	if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
		cERROR(1, "mount option dynperm ignored if cifsacl "
			   "mount option supported");
}

/*
 * When the server supports very large writes via POSIX extensions, we can
 * allow up to 2^24 - PAGE_CACHE_SIZE.
 *
 * Note that this might make for "interesting" allocation problems during
 * writeback however (as we have to allocate an array of pointers for the
 * pages). A 16M write means ~32kb page array with PAGE_CACHE_SIZE == 4096.
 */
#define CIFS_MAX_WSIZE ((1<<24) - PAGE_CACHE_SIZE)

/*
 * When the server doesn't allow large posix writes, default to a wsize of
 * 128k - PAGE_CACHE_SIZE -- one page less than the largest frame size
 * described in RFC1001. This allows space for the header without going over
 * that by default.
 */
#define CIFS_MAX_RFC1001_WSIZE (128 * 1024 - PAGE_CACHE_SIZE)

/*
 * The default wsize is 1M. find_get_pages seems to return a maximum of 256
 * pages in a single call. With PAGE_CACHE_SIZE == 4k, this means we can fill
 * a single wsize request with a single call.
 */
#define CIFS_DEFAULT_WSIZE (1024 * 1024)

static unsigned int
cifs_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *pvolume_info)
{
	__u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
	struct TCP_Server_Info *server = tcon->ses->server;
	unsigned int wsize = pvolume_info->wsize ? pvolume_info->wsize :
				CIFS_DEFAULT_WSIZE;

	/* can server support 24-bit write sizes? (via UNIX extensions) */
	if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
		wsize = min_t(unsigned int, wsize, CIFS_MAX_RFC1001_WSIZE);

	/* no CAP_LARGE_WRITE_X? Limit it to 16 bits */
	if (!(server->capabilities & CAP_LARGE_WRITE_X))
		wsize = min_t(unsigned int, wsize, USHRT_MAX);

	/* hard limit of CIFS_MAX_WSIZE */
	wsize = min_t(unsigned int, wsize, CIFS_MAX_WSIZE);

	return wsize;
}

static int
is_path_accessible(int xid, struct cifs_tcon *tcon,
		   struct cifs_sb_info *cifs_sb, const char *full_path)
{
	int rc;
	FILE_ALL_INFO *pfile_info;

	pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
	if (pfile_info == NULL)
		return -ENOMEM;

	rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info,
			      0 /* not legacy */, cifs_sb->local_nls,
			      cifs_sb->mnt_cifs_flags &
				CIFS_MOUNT_MAP_SPECIAL_CHR);

	if (rc == -EOPNOTSUPP || rc == -EINVAL)
		rc = SMBQueryInformation(xid, tcon, full_path, pfile_info,
				cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
				  CIFS_MOUNT_MAP_SPECIAL_CHR);
	kfree(pfile_info);
	return rc;
}

void
cifs_cleanup_volume_info(struct smb_vol **pvolume_info)
{
	struct smb_vol *volume_info;

	if (!pvolume_info || !*pvolume_info)
		return;

	volume_info = *pvolume_info;
	kfree(volume_info->username);
	kzfree(volume_info->password);
	kfree(volume_info->UNC);
	kfree(volume_info->UNCip);
	kfree(volume_info->domainname);
	kfree(volume_info->iocharset);
	kfree(volume_info->prepath);
	kfree(volume_info);
	*pvolume_info = NULL;
	return;
}

#ifdef CONFIG_CIFS_DFS_UPCALL
/* build_path_to_root returns full path to root when
 * we do not have an exiting connection (tcon) */
static char *
build_unc_path_to_root(const struct smb_vol *volume_info,
		const struct cifs_sb_info *cifs_sb)
{
	char *full_path;

	int unc_len = strnlen(volume_info->UNC, MAX_TREE_SIZE + 1);
	full_path = kmalloc(unc_len + 1, GFP_KERNEL);
	if (full_path == NULL)
		return ERR_PTR(-ENOMEM);

	strncpy(full_path, volume_info->UNC, unc_len);
	full_path[unc_len] = 0; /* add trailing null */
	convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
	return full_path;
}

/*
 * Perform a dfs referral query for a share and (optionally) prefix
 *
 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
 * to a string containing updated options for the submount.  Otherwise it
 * will be left untouched.
 *
 * Returns the rc from get_dfs_path to the caller, which can be used to
 * determine whether there were referrals.
 */
static int
expand_dfs_referral(int xid, struct cifs_ses *pSesInfo,
		    struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
		    int check_prefix)
{
	int rc;
	unsigned int num_referrals = 0;
	struct dfs_info3_param *referrals = NULL;
	char *full_path = NULL, *ref_path = NULL, *mdata = NULL;

	full_path = build_unc_path_to_root(volume_info, cifs_sb);
	if (IS_ERR(full_path))
		return PTR_ERR(full_path);

	/* For DFS paths, skip the first '\' of the UNC */
	ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;

	rc = get_dfs_path(xid, pSesInfo , ref_path, cifs_sb->local_nls,
			  &num_referrals, &referrals,
			  cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);

	if (!rc && num_referrals > 0) {
		char *fake_devname = NULL;

		mdata = cifs_compose_mount_options(cifs_sb->mountdata,
						   full_path + 1, referrals,
						   &fake_devname);

		free_dfs_info_array(referrals, num_referrals);
		kfree(fake_devname);

		if (cifs_sb->mountdata != NULL)
			kfree(cifs_sb->mountdata);

		if (IS_ERR(mdata)) {
			rc = PTR_ERR(mdata);
			mdata = NULL;
		}
		cifs_sb->mountdata = mdata;
	}
	kfree(full_path);
	return rc;
}
#endif

int cifs_setup_volume_info(struct smb_vol **pvolume_info, char *mount_data,
			   const char *devname)
{
	struct smb_vol *volume_info;
	int rc = 0;

	*pvolume_info = NULL;

	volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
	if (!volume_info) {
		rc = -ENOMEM;
		goto out;
	}

	if (cifs_parse_mount_options(mount_data, devname,
				     volume_info)) {
		rc = -EINVAL;
		goto out;
	}

	if (volume_info->nullauth) {
		cFYI(1, "null user");
		volume_info->username = "";
	} else if (volume_info->username) {
		/* BB fixme parse for domain name here */
		cFYI(1, "Username: %s", volume_info->username);
	} else {
		cifserror("No username specified");
	/* In userspace mount helper we can get user name from alternate
	   locations such as env variables and files on disk */
		rc = -EINVAL;
		goto out;
	}

	/* this is needed for ASCII cp to Unicode converts */
	if (volume_info->iocharset == NULL) {
		/* load_nls_default cannot return null */
		volume_info->local_nls = load_nls_default();
	} else {
		volume_info->local_nls = load_nls(volume_info->iocharset);
		if (volume_info->local_nls == NULL) {
			cERROR(1, "CIFS mount error: iocharset %s not found",
				 volume_info->iocharset);
			rc = -ELIBACC;
			goto out;
		}
	}

	*pvolume_info = volume_info;
	return rc;
out:
	cifs_cleanup_volume_info(&volume_info);
	return rc;
}

int
cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
	   struct smb_vol *volume_info, const char *devname)
{
	int rc = 0;
	int xid;
	struct cifs_ses *pSesInfo;
	struct cifs_tcon *tcon;
	struct TCP_Server_Info *srvTcp;
	char   *full_path;
	struct tcon_link *tlink;
#ifdef CONFIG_CIFS_DFS_UPCALL
	int referral_walks_count = 0;

	rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY);
	if (rc)
		return rc;

	cifs_sb->bdi.ra_pages = default_backing_dev_info.ra_pages;

try_mount_again:
	/* cleanup activities if we're chasing a referral */
	if (referral_walks_count) {
		if (tcon)
			cifs_put_tcon(tcon);
		else if (pSesInfo)
			cifs_put_smb_ses(pSesInfo);

		cifs_cleanup_volume_info(&volume_info);
		FreeXid(xid);
	}
#endif
	tcon = NULL;
	pSesInfo = NULL;
	srvTcp = NULL;
	full_path = NULL;
	tlink = NULL;

	xid = GetXid();

	/* get a reference to a tcp session */
	srvTcp = cifs_get_tcp_session(volume_info);
	if (IS_ERR(srvTcp)) {
		rc = PTR_ERR(srvTcp);
		bdi_destroy(&cifs_sb->bdi);
		goto out;
	}

	/* get a reference to a SMB session */
	pSesInfo = cifs_get_smb_ses(srvTcp, volume_info);
	if (IS_ERR(pSesInfo)) {
		rc = PTR_ERR(pSesInfo);
		pSesInfo = NULL;
		goto mount_fail_check;
	}

	if (pSesInfo->capabilities & CAP_LARGE_FILES)
		sb->s_maxbytes = MAX_LFS_FILESIZE;
	else
		sb->s_maxbytes = MAX_NON_LFS;

	/* BB FIXME fix time_gran to be larger for LANMAN sessions */
	sb->s_time_gran = 100;

	/* search for existing tcon to this server share */
	tcon = cifs_get_tcon(pSesInfo, volume_info);
	if (IS_ERR(tcon)) {
		rc = PTR_ERR(tcon);
		tcon = NULL;
		goto remote_path_check;
	}

	/* tell server which Unix caps we support */
	if (tcon->ses->capabilities & CAP_UNIX) {
		/* reset of caps checks mount to see if unix extensions
		   disabled for just this mount */
		reset_cifs_unix_caps(xid, tcon, sb, volume_info);
		if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
		    (le64_to_cpu(tcon->fsUnixInfo.Capability) &
		     CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
			rc = -EACCES;
			goto mount_fail_check;
		}
	} else
		tcon->unix_ext = 0; /* server does not support them */

	/* do not care if following two calls succeed - informational */
	if (!tcon->ipc) {
		CIFSSMBQFSDeviceInfo(xid, tcon);
		CIFSSMBQFSAttributeInfo(xid, tcon);
	}

	if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
		cifs_sb->rsize = 1024 * 127;
		cFYI(DBG2, "no very large read support, rsize now 127K");
	}
	if (!(tcon->ses->capabilities & CAP_LARGE_READ_X))
		cifs_sb->rsize = min(cifs_sb->rsize,
			       (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));

	cifs_sb->wsize = cifs_negotiate_wsize(tcon, volume_info);

remote_path_check:
#ifdef CONFIG_CIFS_DFS_UPCALL
	/*
	 * Perform an unconditional check for whether there are DFS
	 * referrals for this path without prefix, to provide support
	 * for DFS referrals from w2k8 servers which don't seem to respond
	 * with PATH_NOT_COVERED to requests that include the prefix.
	 * Chase the referral if found, otherwise continue normally.
	 */
	if (referral_walks_count == 0) {
		int refrc = expand_dfs_referral(xid, pSesInfo, volume_info,
						cifs_sb, false);
		if (!refrc) {
			referral_walks_count++;
			goto try_mount_again;
		}
	}
#endif

	/* check if a whole path is not remote */
	if (!rc && tcon) {
		/* build_path_to_root works only when we have a valid tcon */
		full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon);
		if (full_path == NULL) {
			rc = -ENOMEM;
			goto mount_fail_check;
		}
		rc = is_path_accessible(xid, tcon, cifs_sb, full_path);
		if (rc != 0 && rc != -EREMOTE) {
			kfree(full_path);
			goto mount_fail_check;
		}
		kfree(full_path);
	}

	/* get referral if needed */
	if (rc == -EREMOTE) {
#ifdef CONFIG_CIFS_DFS_UPCALL
		if (referral_walks_count > MAX_NESTED_LINKS) {
			/*
			 * BB: when we implement proper loop detection,
			 *     we will remove this check. But now we need it
			 *     to prevent an indefinite loop if 'DFS tree' is
			 *     misconfigured (i.e. has loops).
			 */
			rc = -ELOOP;
			goto mount_fail_check;
		}

		rc = expand_dfs_referral(xid, pSesInfo, volume_info, cifs_sb,
					 true);

		if (!rc) {
			referral_walks_count++;
			goto try_mount_again;
		}
		goto mount_fail_check;
#else /* No DFS support, return error on mount */
		rc = -EOPNOTSUPP;
#endif
	}

	if (rc)
		goto mount_fail_check;

	/* now, hang the tcon off of the superblock */
	tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
	if (tlink == NULL) {
		rc = -ENOMEM;
		goto mount_fail_check;
	}

	tlink->tl_uid = pSesInfo->linux_uid;
	tlink->tl_tcon = tcon;
	tlink->tl_time = jiffies;
	set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
	set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);

	cifs_sb->master_tlink = tlink;
	spin_lock(&cifs_sb->tlink_tree_lock);
	tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
	spin_unlock(&cifs_sb->tlink_tree_lock);

	queue_delayed_work(system_nrt_wq, &cifs_sb->prune_tlinks,
				TLINK_IDLE_EXPIRE);

mount_fail_check:
	/* on error free sesinfo and tcon struct if needed */
	if (rc) {
		/* If find_unc succeeded then rc == 0 so we can not end */
		/* up accidentally freeing someone elses tcon struct */
		if (tcon)
			cifs_put_tcon(tcon);
		else if (pSesInfo)
			cifs_put_smb_ses(pSesInfo);
		else
			cifs_put_tcp_session(srvTcp);
		bdi_destroy(&cifs_sb->bdi);
		goto out;
	}

	/* volume_info->password is freed above when existing session found
	(in which case it is not needed anymore) but when new sesion is created
	the password ptr is put in the new session structure (in which case the
	password will be freed at unmount time) */
out:
	/* zero out password before freeing */
	FreeXid(xid);
	return rc;
}

/*
 * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon
 * pointer may be NULL.
 */
int
CIFSTCon(unsigned int xid, struct cifs_ses *ses,
	 const char *tree, struct cifs_tcon *tcon,
	 const struct nls_table *nls_codepage)
{
	struct smb_hdr *smb_buffer;
	struct smb_hdr *smb_buffer_response;
	TCONX_REQ *pSMB;
	TCONX_RSP *pSMBr;
	unsigned char *bcc_ptr;
	int rc = 0;
	int length;
	__u16 bytes_left, count;

	if (ses == NULL)
		return -EIO;

	smb_buffer = cifs_buf_get();
	if (smb_buffer == NULL)
		return -ENOMEM;

	smb_buffer_response = smb_buffer;

	header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
			NULL /*no tid */ , 4 /*wct */ );

	smb_buffer->Mid = GetNextMid(ses->server);
	smb_buffer->Uid = ses->Suid;
	pSMB = (TCONX_REQ *) smb_buffer;
	pSMBr = (TCONX_RSP *) smb_buffer_response;

	pSMB->AndXCommand = 0xFF;
	pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
	bcc_ptr = &pSMB->Password[0];
	if (!tcon || (ses->server->sec_mode & SECMODE_USER)) {
		pSMB->PasswordLength = cpu_to_le16(1);	/* minimum */
		*bcc_ptr = 0; /* password is null byte */
		bcc_ptr++;              /* skip password */
		/* already aligned so no need to do it below */
	} else {
		pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
		/* BB FIXME add code to fail this if NTLMv2 or Kerberos
		   specified as required (when that support is added to
		   the vfs in the future) as only NTLM or the much
		   weaker LANMAN (which we do not send by default) is accepted
		   by Samba (not sure whether other servers allow
		   NTLMv2 password here) */
#ifdef CONFIG_CIFS_WEAK_PW_HASH
		if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
		    (ses->server->secType == LANMAN))
			calc_lanman_hash(tcon->password, ses->server->cryptkey,
					 ses->server->sec_mode &
					    SECMODE_PW_ENCRYPT ? true : false,
					 bcc_ptr);
		else
#endif /* CIFS_WEAK_PW_HASH */
		rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
					bcc_ptr);

		bcc_ptr += CIFS_AUTH_RESP_SIZE;
		if (ses->capabilities & CAP_UNICODE) {
			/* must align unicode strings */
			*bcc_ptr = 0; /* null byte password */
			bcc_ptr++;
		}
	}

	if (ses->server->sec_mode &
			(SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
		smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;

	if (ses->capabilities & CAP_STATUS32) {
		smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
	}
	if (ses->capabilities & CAP_DFS) {
		smb_buffer->Flags2 |= SMBFLG2_DFS;
	}
	if (ses->capabilities & CAP_UNICODE) {
		smb_buffer->Flags2 |= SMBFLG2_UNICODE;
		length =
		    cifs_strtoUCS((__le16 *) bcc_ptr, tree,
			6 /* max utf8 char length in bytes */ *
			(/* server len*/ + 256 /* share len */), nls_codepage);
		bcc_ptr += 2 * length;	/* convert num 16 bit words to bytes */
		bcc_ptr += 2;	/* skip trailing null */
	} else {		/* ASCII */
		strcpy(bcc_ptr, tree);
		bcc_ptr += strlen(tree) + 1;
	}
	strcpy(bcc_ptr, "?????");
	bcc_ptr += strlen("?????");
	bcc_ptr += 1;
	count = bcc_ptr - &pSMB->Password[0];
	pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
					pSMB->hdr.smb_buf_length) + count);
	pSMB->ByteCount = cpu_to_le16(count);

	rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
			 0);

	/* above now done in SendReceive */
	if ((rc == 0) && (tcon != NULL)) {
		bool is_unicode;

		tcon->tidStatus = CifsGood;
		tcon->need_reconnect = false;
		tcon->tid = smb_buffer_response->Tid;
		bcc_ptr = pByteArea(smb_buffer_response);
		bytes_left = get_bcc(smb_buffer_response);
		length = strnlen(bcc_ptr, bytes_left - 2);
		if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
			is_unicode = true;
		else
			is_unicode = false;


		/* skip service field (NB: this field is always ASCII) */
		if (length == 3) {
			if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
			    (bcc_ptr[2] == 'C')) {
				cFYI(1, "IPC connection");
				tcon->ipc = 1;
			}
		} else if (length == 2) {
			if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
				/* the most common case */
				cFYI(1, "disk share connection");
			}
		}
		bcc_ptr += length + 1;
		bytes_left -= (length + 1);
		strncpy(tcon->treeName, tree, MAX_TREE_SIZE);

		/* mostly informational -- no need to fail on error here */
		kfree(tcon->nativeFileSystem);
		tcon->nativeFileSystem = cifs_strndup_from_ucs(bcc_ptr,
						      bytes_left, is_unicode,
						      nls_codepage);

		cFYI(1, "nativeFileSystem=%s", tcon->nativeFileSystem);

		if ((smb_buffer_response->WordCount == 3) ||
			 (smb_buffer_response->WordCount == 7))
			/* field is in same location */
			tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
		else
			tcon->Flags = 0;
		cFYI(1, "Tcon flags: 0x%x ", tcon->Flags);
	} else if ((rc == 0) && tcon == NULL) {
		/* all we need to save for IPC$ connection */
		ses->ipc_tid = smb_buffer_response->Tid;
	}

	cifs_buf_release(smb_buffer);
	return rc;
}

int
cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
{
	struct rb_root *root = &cifs_sb->tlink_tree;
	struct rb_node *node;
	struct tcon_link *tlink;

	cancel_delayed_work_sync(&cifs_sb->prune_tlinks);

	spin_lock(&cifs_sb->tlink_tree_lock);
	while ((node = rb_first(root))) {
		tlink = rb_entry(node, struct tcon_link, tl_rbnode);
		cifs_get_tlink(tlink);
		clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
		rb_erase(node, root);

		spin_unlock(&cifs_sb->tlink_tree_lock);
		cifs_put_tlink(tlink);
		spin_lock(&cifs_sb->tlink_tree_lock);
	}
	spin_unlock(&cifs_sb->tlink_tree_lock);

	bdi_destroy(&cifs_sb->bdi);
	return 0;
}

int cifs_negotiate_protocol(unsigned int xid, struct cifs_ses *ses)
{
	int rc = 0;
	struct TCP_Server_Info *server = ses->server;

	/* only send once per connect */
	if (server->maxBuf != 0)
		return 0;

	rc = CIFSSMBNegotiate(xid, ses);
	if (rc == -EAGAIN) {
		/* retry only once on 1st time connection */
		rc = CIFSSMBNegotiate(xid, ses);
		if (rc == -EAGAIN)
			rc = -EHOSTDOWN;
	}
	if (rc == 0) {
		spin_lock(&GlobalMid_Lock);
		if (server->tcpStatus == CifsNeedNegotiate)
			server->tcpStatus = CifsGood;
		else
			rc = -EHOSTDOWN;
		spin_unlock(&GlobalMid_Lock);

	}

	return rc;
}


int cifs_setup_session(unsigned int xid, struct cifs_ses *ses,
			struct nls_table *nls_info)
{
	int rc = 0;
	struct TCP_Server_Info *server = ses->server;

	ses->flags = 0;
	ses->capabilities = server->capabilities;
	if (linuxExtEnabled == 0)
		ses->capabilities &= (~CAP_UNIX);

	cFYI(1, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
		 server->sec_mode, server->capabilities, server->timeAdj);

	rc = CIFS_SessSetup(xid, ses, nls_info);
	if (rc) {
		cERROR(1, "Send error in SessSetup = %d", rc);
	} else {
		mutex_lock(&ses->server->srv_mutex);
		if (!server->session_estab) {
			server->session_key.response = ses->auth_key.response;
			server->session_key.len = ses->auth_key.len;
			server->sequence_number = 0x2;
			server->session_estab = true;
			ses->auth_key.response = NULL;
		}
		mutex_unlock(&server->srv_mutex);

		cFYI(1, "CIFS Session Established successfully");
		spin_lock(&GlobalMid_Lock);
		ses->status = CifsGood;
		ses->need_reconnect = false;
		spin_unlock(&GlobalMid_Lock);
	}

	kfree(ses->auth_key.response);
	ses->auth_key.response = NULL;
	ses->auth_key.len = 0;
	kfree(ses->ntlmssp);
	ses->ntlmssp = NULL;

	return rc;
}

static struct cifs_tcon *
cifs_construct_tcon(struct cifs_sb_info *cifs_sb, uid_t fsuid)
{
	struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
	struct cifs_ses *ses;
	struct cifs_tcon *tcon = NULL;
	struct smb_vol *vol_info;
	char username[28]; /* big enough for "krb50x" + hex of ULONG_MAX 6+16 */
			   /* We used to have this as MAX_USERNAME which is   */
			   /* way too big now (256 instead of 32) */

	vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
	if (vol_info == NULL) {
		tcon = ERR_PTR(-ENOMEM);
		goto out;
	}

	snprintf(username, MAX_USERNAME_SIZE, "krb50x%x", fsuid);
	vol_info->username = username;
	vol_info->local_nls = cifs_sb->local_nls;
	vol_info->linux_uid = fsuid;
	vol_info->cred_uid = fsuid;
	vol_info->UNC = master_tcon->treeName;
	vol_info->retry = master_tcon->retry;
	vol_info->nocase = master_tcon->nocase;
	vol_info->local_lease = master_tcon->local_lease;
	vol_info->no_linux_ext = !master_tcon->unix_ext;

	/* FIXME: allow for other secFlg settings */
	vol_info->secFlg = CIFSSEC_MUST_KRB5;

	/* get a reference for the same TCP session */
	spin_lock(&cifs_tcp_ses_lock);
	++master_tcon->ses->server->srv_count;
	spin_unlock(&cifs_tcp_ses_lock);

	ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
	if (IS_ERR(ses)) {
		tcon = (struct cifs_tcon *)ses;
		cifs_put_tcp_session(master_tcon->ses->server);
		goto out;
	}

	tcon = cifs_get_tcon(ses, vol_info);
	if (IS_ERR(tcon)) {
		cifs_put_smb_ses(ses);
		goto out;
	}

	if (ses->capabilities & CAP_UNIX)
		reset_cifs_unix_caps(0, tcon, NULL, vol_info);
out:
	kfree(vol_info);

	return tcon;
}

struct cifs_tcon *
cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
{
	return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
}

static int
cifs_sb_tcon_pending_wait(void *unused)
{
	schedule();
	return signal_pending(current) ? -ERESTARTSYS : 0;
}

/* find and return a tlink with given uid */
static struct tcon_link *
tlink_rb_search(struct rb_root *root, uid_t uid)
{
	struct rb_node *node = root->rb_node;
	struct tcon_link *tlink;

	while (node) {
		tlink = rb_entry(node, struct tcon_link, tl_rbnode);

		if (tlink->tl_uid > uid)
			node = node->rb_left;
		else if (tlink->tl_uid < uid)
			node = node->rb_right;
		else
			return tlink;
	}
	return NULL;
}

/* insert a tcon_link into the tree */
static void
tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
{
	struct rb_node **new = &(root->rb_node), *parent = NULL;
	struct tcon_link *tlink;

	while (*new) {
		tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
		parent = *new;

		if (tlink->tl_uid > new_tlink->tl_uid)
			new = &((*new)->rb_left);
		else
			new = &((*new)->rb_right);
	}

	rb_link_node(&new_tlink->tl_rbnode, parent, new);
	rb_insert_color(&new_tlink->tl_rbnode, root);
}

/*
 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
 * current task.
 *
 * If the superblock doesn't refer to a multiuser mount, then just return
 * the master tcon for the mount.
 *
 * First, search the rbtree for an existing tcon for this fsuid. If one
 * exists, then check to see if it's pending construction. If it is then wait
 * for construction to complete. Once it's no longer pending, check to see if
 * it failed and either return an error or retry construction, depending on
 * the timeout.
 *
 * If one doesn't exist then insert a new tcon_link struct into the tree and
 * try to construct a new one.
 */
struct tcon_link *
cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
{
	int ret;
	uid_t fsuid = current_fsuid();
	struct tcon_link *tlink, *newtlink;

	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
		return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));

	spin_lock(&cifs_sb->tlink_tree_lock);
	tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
	if (tlink)
		cifs_get_tlink(tlink);
	spin_unlock(&cifs_sb->tlink_tree_lock);

	if (tlink == NULL) {
		newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
		if (newtlink == NULL)
			return ERR_PTR(-ENOMEM);
		newtlink->tl_uid = fsuid;
		newtlink->tl_tcon = ERR_PTR(-EACCES);
		set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
		set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
		cifs_get_tlink(newtlink);

		spin_lock(&cifs_sb->tlink_tree_lock);
		/* was one inserted after previous search? */
		tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
		if (tlink) {
			cifs_get_tlink(tlink);
			spin_unlock(&cifs_sb->tlink_tree_lock);
			kfree(newtlink);
			goto wait_for_construction;
		}
		tlink = newtlink;
		tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
		spin_unlock(&cifs_sb->tlink_tree_lock);
	} else {
wait_for_construction:
		ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
				  cifs_sb_tcon_pending_wait,
				  TASK_INTERRUPTIBLE);
		if (ret) {
			cifs_put_tlink(tlink);
			return ERR_PTR(ret);
		}

		/* if it's good, return it */
		if (!IS_ERR(tlink->tl_tcon))
			return tlink;

		/* return error if we tried this already recently */
		if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
			cifs_put_tlink(tlink);
			return ERR_PTR(-EACCES);
		}

		if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
			goto wait_for_construction;
	}

	tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
	clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
	wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);

	if (IS_ERR(tlink->tl_tcon)) {
		cifs_put_tlink(tlink);
		return ERR_PTR(-EACCES);
	}

	return tlink;
}

/*
 * periodic workqueue job that scans tcon_tree for a superblock and closes
 * out tcons.
 */
static void
cifs_prune_tlinks(struct work_struct *work)
{
	struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
						    prune_tlinks.work);
	struct rb_root *root = &cifs_sb->tlink_tree;
	struct rb_node *node = rb_first(root);
	struct rb_node *tmp;
	struct tcon_link *tlink;

	/*
	 * Because we drop the spinlock in the loop in order to put the tlink
	 * it's not guarded against removal of links from the tree. The only
	 * places that remove entries from the tree are this function and
	 * umounts. Because this function is non-reentrant and is canceled
	 * before umount can proceed, this is safe.
	 */
	spin_lock(&cifs_sb->tlink_tree_lock);
	node = rb_first(root);
	while (node != NULL) {
		tmp = node;
		node = rb_next(tmp);
		tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);

		if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
		    atomic_read(&tlink->tl_count) != 0 ||
		    time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
			continue;

		cifs_get_tlink(tlink);
		clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
		rb_erase(tmp, root);

		spin_unlock(&cifs_sb->tlink_tree_lock);
		cifs_put_tlink(tlink);
		spin_lock(&cifs_sb->tlink_tree_lock);
	}
	spin_unlock(&cifs_sb->tlink_tree_lock);

	queue_delayed_work(system_nrt_wq, &cifs_sb->prune_tlinks,
				TLINK_IDLE_EXPIRE);
}
OpenPOWER on IntegriCloud