Bootlin logo

Elixir Cross Referencer

   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
/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright 1996, 1997, 1998 Hans Reiser, see reiserfs/README for
 * licensing and copyright details
 */

#include <linux/reiserfs_fs.h>

#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <linux/bug.h>
#include <linux/workqueue.h>
#include <asm/unaligned.h>
#include <linux/bitops.h>
#include <linux/proc_fs.h>
#include <linux/buffer_head.h>

/* the 32 bit compat definitions with int argument */
#define REISERFS_IOC32_UNPACK		_IOW(0xCD, 1, int)
#define REISERFS_IOC32_GETFLAGS		FS_IOC32_GETFLAGS
#define REISERFS_IOC32_SETFLAGS		FS_IOC32_SETFLAGS
#define REISERFS_IOC32_GETVERSION	FS_IOC32_GETVERSION
#define REISERFS_IOC32_SETVERSION	FS_IOC32_SETVERSION

struct reiserfs_journal_list;

/* bitmasks for i_flags field in reiserfs-specific part of inode */
typedef enum {
	/*
	 * this says what format of key do all items (but stat data) of
	 * an object have.  If this is set, that format is 3.6 otherwise - 3.5
	 */
	i_item_key_version_mask = 0x0001,

	/*
	 * If this is unset, object has 3.5 stat data, otherwise,
	 * it has 3.6 stat data with 64bit size, 32bit nlink etc.
	 */
	i_stat_data_version_mask = 0x0002,

	/* file might need tail packing on close */
	i_pack_on_close_mask = 0x0004,

	/* don't pack tail of file */
	i_nopack_mask = 0x0008,

	/*
	 * If either of these are set, "safe link" was created for this
	 * file during truncate or unlink. Safe link is used to avoid
	 * leakage of disk space on crash with some files open, but unlinked.
	 */
	i_link_saved_unlink_mask = 0x0010,
	i_link_saved_truncate_mask = 0x0020,

	i_has_xattr_dir = 0x0040,
	i_data_log = 0x0080,
} reiserfs_inode_flags;

struct reiserfs_inode_info {
	__u32 i_key[4];		/* key is still 4 32 bit integers */

	/*
	 * transient inode flags that are never stored on disk. Bitmasks
	 * for this field are defined above.
	 */
	__u32 i_flags;

	/* offset of first byte stored in direct item. */
	__u32 i_first_direct_byte;

	/* copy of persistent inode flags read from sd_attrs. */
	__u32 i_attrs;

	/* first unused block of a sequence of unused blocks */
	int i_prealloc_block;
	int i_prealloc_count;	/* length of that sequence */

	/* per-transaction list of inodes which  have preallocated blocks */
	struct list_head i_prealloc_list;

	/*
	 * new_packing_locality is created; new blocks for the contents
	 * of this directory should be displaced
	 */
	unsigned new_packing_locality:1;

	/*
	 * we use these for fsync or O_SYNC to decide which transaction
	 * needs to be committed in order for this inode to be properly
	 * flushed
	 */
	unsigned int i_trans_id;

	struct reiserfs_journal_list *i_jl;
	atomic_t openers;
	struct mutex tailpack;
#ifdef CONFIG_REISERFS_FS_XATTR
	struct rw_semaphore i_xattr_sem;
#endif
#ifdef CONFIG_QUOTA
	struct dquot *i_dquot[MAXQUOTAS];
#endif

	struct inode vfs_inode;
};

typedef enum {
	reiserfs_attrs_cleared = 0x00000001,
} reiserfs_super_block_flags;

/*
 * struct reiserfs_super_block accessors/mutators since this is a disk
 * structure, it will always be in little endian format.
 */
#define sb_block_count(sbp)         (le32_to_cpu((sbp)->s_v1.s_block_count))
#define set_sb_block_count(sbp,v)   ((sbp)->s_v1.s_block_count = cpu_to_le32(v))
#define sb_free_blocks(sbp)         (le32_to_cpu((sbp)->s_v1.s_free_blocks))
#define set_sb_free_blocks(sbp,v)   ((sbp)->s_v1.s_free_blocks = cpu_to_le32(v))
#define sb_root_block(sbp)          (le32_to_cpu((sbp)->s_v1.s_root_block))
#define set_sb_root_block(sbp,v)    ((sbp)->s_v1.s_root_block = cpu_to_le32(v))

#define sb_jp_journal_1st_block(sbp)  \
              (le32_to_cpu((sbp)->s_v1.s_journal.jp_journal_1st_block))
#define set_sb_jp_journal_1st_block(sbp,v) \
              ((sbp)->s_v1.s_journal.jp_journal_1st_block = cpu_to_le32(v))
#define sb_jp_journal_dev(sbp) \
              (le32_to_cpu((sbp)->s_v1.s_journal.jp_journal_dev))
#define set_sb_jp_journal_dev(sbp,v) \
              ((sbp)->s_v1.s_journal.jp_journal_dev = cpu_to_le32(v))
#define sb_jp_journal_size(sbp) \
              (le32_to_cpu((sbp)->s_v1.s_journal.jp_journal_size))
#define set_sb_jp_journal_size(sbp,v) \
              ((sbp)->s_v1.s_journal.jp_journal_size = cpu_to_le32(v))
#define sb_jp_journal_trans_max(sbp) \
              (le32_to_cpu((sbp)->s_v1.s_journal.jp_journal_trans_max))
#define set_sb_jp_journal_trans_max(sbp,v) \
              ((sbp)->s_v1.s_journal.jp_journal_trans_max = cpu_to_le32(v))
#define sb_jp_journal_magic(sbp) \
              (le32_to_cpu((sbp)->s_v1.s_journal.jp_journal_magic))
#define set_sb_jp_journal_magic(sbp,v) \
              ((sbp)->s_v1.s_journal.jp_journal_magic = cpu_to_le32(v))
#define sb_jp_journal_max_batch(sbp) \
              (le32_to_cpu((sbp)->s_v1.s_journal.jp_journal_max_batch))
#define set_sb_jp_journal_max_batch(sbp,v) \
              ((sbp)->s_v1.s_journal.jp_journal_max_batch = cpu_to_le32(v))
#define sb_jp_jourmal_max_commit_age(sbp) \
              (le32_to_cpu((sbp)->s_v1.s_journal.jp_journal_max_commit_age))
#define set_sb_jp_journal_max_commit_age(sbp,v) \
              ((sbp)->s_v1.s_journal.jp_journal_max_commit_age = cpu_to_le32(v))

#define sb_blocksize(sbp)          (le16_to_cpu((sbp)->s_v1.s_blocksize))
#define set_sb_blocksize(sbp,v)    ((sbp)->s_v1.s_blocksize = cpu_to_le16(v))
#define sb_oid_maxsize(sbp)        (le16_to_cpu((sbp)->s_v1.s_oid_maxsize))
#define set_sb_oid_maxsize(sbp,v)  ((sbp)->s_v1.s_oid_maxsize = cpu_to_le16(v))
#define sb_oid_cursize(sbp)        (le16_to_cpu((sbp)->s_v1.s_oid_cursize))
#define set_sb_oid_cursize(sbp,v)  ((sbp)->s_v1.s_oid_cursize = cpu_to_le16(v))
#define sb_umount_state(sbp)       (le16_to_cpu((sbp)->s_v1.s_umount_state))
#define set_sb_umount_state(sbp,v) ((sbp)->s_v1.s_umount_state = cpu_to_le16(v))
#define sb_fs_state(sbp)           (le16_to_cpu((sbp)->s_v1.s_fs_state))
#define set_sb_fs_state(sbp,v)     ((sbp)->s_v1.s_fs_state = cpu_to_le16(v))
#define sb_hash_function_code(sbp) \
              (le32_to_cpu((sbp)->s_v1.s_hash_function_code))
#define set_sb_hash_function_code(sbp,v) \
              ((sbp)->s_v1.s_hash_function_code = cpu_to_le32(v))
#define sb_tree_height(sbp)        (le16_to_cpu((sbp)->s_v1.s_tree_height))
#define set_sb_tree_height(sbp,v)  ((sbp)->s_v1.s_tree_height = cpu_to_le16(v))
#define sb_bmap_nr(sbp)            (le16_to_cpu((sbp)->s_v1.s_bmap_nr))
#define set_sb_bmap_nr(sbp,v)      ((sbp)->s_v1.s_bmap_nr = cpu_to_le16(v))
#define sb_version(sbp)            (le16_to_cpu((sbp)->s_v1.s_version))
#define set_sb_version(sbp,v)      ((sbp)->s_v1.s_version = cpu_to_le16(v))

#define sb_mnt_count(sbp)	   (le16_to_cpu((sbp)->s_mnt_count))
#define set_sb_mnt_count(sbp, v)   ((sbp)->s_mnt_count = cpu_to_le16(v))

#define sb_reserved_for_journal(sbp) \
              (le16_to_cpu((sbp)->s_v1.s_reserved_for_journal))
#define set_sb_reserved_for_journal(sbp,v) \
              ((sbp)->s_v1.s_reserved_for_journal = cpu_to_le16(v))

/* LOGGING -- */

/*
 * These all interelate for performance.
 *
 * If the journal block count is smaller than n transactions, you lose speed.
 * I don't know what n is yet, I'm guessing 8-16.
 *
 * typical transaction size depends on the application, how often fsync is
 * called, and how many metadata blocks you dirty in a 30 second period.
 * The more small files (<16k) you use, the larger your transactions will
 * be.
 *
 * If your journal fills faster than dirty buffers get flushed to disk, it
 * must flush them before allowing the journal to wrap, which slows things
 * down.  If you need high speed meta data updates, the journal should be
 * big enough to prevent wrapping before dirty meta blocks get to disk.
 *
 * If the batch max is smaller than the transaction max, you'll waste space
 * at the end of the journal because journal_end sets the next transaction
 * to start at 0 if the next transaction has any chance of wrapping.
 *
 * The large the batch max age, the better the speed, and the more meta
 * data changes you'll lose after a crash.
 */

/* don't mess with these for a while */
/* we have a node size define somewhere in reiserfs_fs.h. -Hans */
#define JOURNAL_BLOCK_SIZE  4096	/* BUG gotta get rid of this */
#define JOURNAL_MAX_CNODE   1500	/* max cnodes to allocate. */
#define JOURNAL_HASH_SIZE 8192

/* number of copies of the bitmaps to have floating.  Must be >= 2 */
#define JOURNAL_NUM_BITMAPS 5

/*
 * One of these for every block in every transaction
 * Each one is in two hash tables.  First, a hash of the current transaction,
 * and after journal_end, a hash of all the in memory transactions.
 * next and prev are used by the current transaction (journal_hash).
 * hnext and hprev are used by journal_list_hash.  If a block is in more
 * than one transaction, the journal_list_hash links it in multiple times.
 * This allows flush_journal_list to remove just the cnode belonging to a
 * given transaction.
 */
struct reiserfs_journal_cnode {
	struct buffer_head *bh;	/* real buffer head */
	struct super_block *sb;	/* dev of real buffer head */

	/* block number of real buffer head, == 0 when buffer on disk */
	__u32 blocknr;

	unsigned long state;

	/* journal list this cnode lives in */
	struct reiserfs_journal_list *jlist;

	struct reiserfs_journal_cnode *next;	/* next in transaction list */
	struct reiserfs_journal_cnode *prev;	/* prev in transaction list */
	struct reiserfs_journal_cnode *hprev;	/* prev in hash list */
	struct reiserfs_journal_cnode *hnext;	/* next in hash list */
};

struct reiserfs_bitmap_node {
	int id;
	char *data;
	struct list_head list;
};

struct reiserfs_list_bitmap {
	struct reiserfs_journal_list *journal_list;
	struct reiserfs_bitmap_node **bitmaps;
};

/*
 * one of these for each transaction.  The most important part here is the
 * j_realblock.  this list of cnodes is used to hash all the blocks in all
 * the commits, to mark all the real buffer heads dirty once all the commits
 * hit the disk, and to make sure every real block in a transaction is on
 * disk before allowing the log area to be overwritten
 */
struct reiserfs_journal_list {
	unsigned long j_start;
	unsigned long j_state;
	unsigned long j_len;
	atomic_t j_nonzerolen;
	atomic_t j_commit_left;

	/* all commits older than this on disk */
	atomic_t j_older_commits_done;

	struct mutex j_commit_mutex;
	unsigned int j_trans_id;
	time64_t j_timestamp; /* write-only but useful for crash dump analysis */
	struct reiserfs_list_bitmap *j_list_bitmap;
	struct buffer_head *j_commit_bh;	/* commit buffer head */
	struct reiserfs_journal_cnode *j_realblock;
	struct reiserfs_journal_cnode *j_freedlist;	/* list of buffers that were freed during this trans.  free each of these on flush */
	/* time ordered list of all active transactions */
	struct list_head j_list;

	/*
	 * time ordered list of all transactions we haven't tried
	 * to flush yet
	 */
	struct list_head j_working_list;

	/* list of tail conversion targets in need of flush before commit */
	struct list_head j_tail_bh_list;

	/* list of data=ordered buffers in need of flush before commit */
	struct list_head j_bh_list;
	int j_refcount;
};

struct reiserfs_journal {
	struct buffer_head **j_ap_blocks;	/* journal blocks on disk */
	/* newest journal block */
	struct reiserfs_journal_cnode *j_last;

	/* oldest journal block.  start here for traverse */
	struct reiserfs_journal_cnode *j_first;

	struct block_device *j_dev_bd;
	fmode_t j_dev_mode;

	/* first block on s_dev of reserved area journal */
	int j_1st_reserved_block;

	unsigned long j_state;
	unsigned int j_trans_id;
	unsigned long j_mount_id;

	/* start of current waiting commit (index into j_ap_blocks) */
	unsigned long j_start;
	unsigned long j_len;	/* length of current waiting commit */

	/* number of buffers requested by journal_begin() */
	unsigned long j_len_alloc;

	atomic_t j_wcount;	/* count of writers for current commit */

	/* batch count. allows turning X transactions into 1 */
	unsigned long j_bcount;

	/* first unflushed transactions offset */
	unsigned long j_first_unflushed_offset;

	/* last fully flushed journal timestamp */
	unsigned j_last_flush_trans_id;

	struct buffer_head *j_header_bh;

	time64_t j_trans_start_time;	/* time this transaction started */
	struct mutex j_mutex;
	struct mutex j_flush_mutex;

	/* wait for current transaction to finish before starting new one */
	wait_queue_head_t j_join_wait;

	atomic_t j_jlock;		/* lock for j_join_wait */
	int j_list_bitmap_index;	/* number of next list bitmap to use */

	/* no more journal begins allowed. MUST sleep on j_join_wait */
	int j_must_wait;

	/* next journal_end will flush all journal list */
	int j_next_full_flush;

	/* next journal_end will flush all async commits */
	int j_next_async_flush;

	int j_cnode_used;	/* number of cnodes on the used list */
	int j_cnode_free;	/* number of cnodes on the free list */

	/* max number of blocks in a transaction.  */
	unsigned int j_trans_max;

	/* max number of blocks to batch into a trans */
	unsigned int j_max_batch;

	/* in seconds, how old can an async commit be */
	unsigned int j_max_commit_age;

	/* in seconds, how old can a transaction be */
	unsigned int j_max_trans_age;

	/* the default for the max commit age */
	unsigned int j_default_max_commit_age;

	struct reiserfs_journal_cnode *j_cnode_free_list;

	/* orig pointer returned from vmalloc */
	struct reiserfs_journal_cnode *j_cnode_free_orig;

	struct reiserfs_journal_list *j_current_jl;
	int j_free_bitmap_nodes;
	int j_used_bitmap_nodes;

	int j_num_lists;	/* total number of active transactions */
	int j_num_work_lists;	/* number that need attention from kreiserfsd */

	/* debugging to make sure things are flushed in order */
	unsigned int j_last_flush_id;

	/* debugging to make sure things are committed in order */
	unsigned int j_last_commit_id;

	struct list_head j_bitmap_nodes;
	struct list_head j_dirty_buffers;
	spinlock_t j_dirty_buffers_lock;	/* protects j_dirty_buffers */

	/* list of all active transactions */
	struct list_head j_journal_list;

	/* lists that haven't been touched by writeback attempts */
	struct list_head j_working_list;

	/* hash table for real buffer heads in current trans */
	struct reiserfs_journal_cnode *j_hash_table[JOURNAL_HASH_SIZE];

	/* hash table for all the real buffer heads in all the transactions */
	struct reiserfs_journal_cnode *j_list_hash_table[JOURNAL_HASH_SIZE];

	/* array of bitmaps to record the deleted blocks */
	struct reiserfs_list_bitmap j_list_bitmap[JOURNAL_NUM_BITMAPS];

	/* list of inodes which have preallocated blocks */
	struct list_head j_prealloc_list;
	int j_persistent_trans;
	unsigned long j_max_trans_size;
	unsigned long j_max_batch_size;

	int j_errno;

	/* when flushing ordered buffers, throttle new ordered writers */
	struct delayed_work j_work;
	struct super_block *j_work_sb;
	atomic_t j_async_throttle;
};

enum journal_state_bits {
	J_WRITERS_BLOCKED = 1,	/* set when new writers not allowed */
	J_WRITERS_QUEUED,    /* set when log is full due to too many writers */
	J_ABORTED,           /* set when log is aborted */
};

/* ick.  magic string to find desc blocks in the journal */
#define JOURNAL_DESC_MAGIC "ReIsErLB"

typedef __u32(*hashf_t) (const signed char *, int);

struct reiserfs_bitmap_info {
	__u32 free_count;
};

struct proc_dir_entry;

#if defined( CONFIG_PROC_FS ) && defined( CONFIG_REISERFS_PROC_INFO )
typedef unsigned long int stat_cnt_t;
typedef struct reiserfs_proc_info_data {
	spinlock_t lock;
	int exiting;
	int max_hash_collisions;

	stat_cnt_t breads;
	stat_cnt_t bread_miss;
	stat_cnt_t search_by_key;
	stat_cnt_t search_by_key_fs_changed;
	stat_cnt_t search_by_key_restarted;

	stat_cnt_t insert_item_restarted;
	stat_cnt_t paste_into_item_restarted;
	stat_cnt_t cut_from_item_restarted;
	stat_cnt_t delete_solid_item_restarted;
	stat_cnt_t delete_item_restarted;

	stat_cnt_t leaked_oid;
	stat_cnt_t leaves_removable;

	/*
	 * balances per level.
	 * Use explicit 5 as MAX_HEIGHT is not visible yet.
	 */
	stat_cnt_t balance_at[5];	/* XXX */
	/* sbk == search_by_key */
	stat_cnt_t sbk_read_at[5];	/* XXX */
	stat_cnt_t sbk_fs_changed[5];
	stat_cnt_t sbk_restarted[5];
	stat_cnt_t items_at[5];	/* XXX */
	stat_cnt_t free_at[5];	/* XXX */
	stat_cnt_t can_node_be_removed[5];	/* XXX */
	long int lnum[5];	/* XXX */
	long int rnum[5];	/* XXX */
	long int lbytes[5];	/* XXX */
	long int rbytes[5];	/* XXX */
	stat_cnt_t get_neighbors[5];
	stat_cnt_t get_neighbors_restart[5];
	stat_cnt_t need_l_neighbor[5];
	stat_cnt_t need_r_neighbor[5];

	stat_cnt_t free_block;
	struct __scan_bitmap_stats {
		stat_cnt_t call;
		stat_cnt_t wait;
		stat_cnt_t bmap;
		stat_cnt_t retry;
		stat_cnt_t in_journal_hint;
		stat_cnt_t in_journal_nohint;
		stat_cnt_t stolen;
	} scan_bitmap;
	struct __journal_stats {
		stat_cnt_t in_journal;
		stat_cnt_t in_journal_bitmap;
		stat_cnt_t in_journal_reusable;
		stat_cnt_t lock_journal;
		stat_cnt_t lock_journal_wait;
		stat_cnt_t journal_being;
		stat_cnt_t journal_relock_writers;
		stat_cnt_t journal_relock_wcount;
		stat_cnt_t mark_dirty;
		stat_cnt_t mark_dirty_already;
		stat_cnt_t mark_dirty_notjournal;
		stat_cnt_t restore_prepared;
		stat_cnt_t prepare;
		stat_cnt_t prepare_retry;
	} journal;
} reiserfs_proc_info_data_t;
#else
typedef struct reiserfs_proc_info_data {
} reiserfs_proc_info_data_t;
#endif

/* Number of quota types we support */
#define REISERFS_MAXQUOTAS 2

/* reiserfs union of in-core super block data */
struct reiserfs_sb_info {
	/* Buffer containing the super block */
	struct buffer_head *s_sbh;

	/* Pointer to the on-disk super block in the buffer */
	struct reiserfs_super_block *s_rs;
	struct reiserfs_bitmap_info *s_ap_bitmap;

	/* pointer to journal information */
	struct reiserfs_journal *s_journal;

	unsigned short s_mount_state;	/* reiserfs state (valid, invalid) */

	/* Serialize writers access, replace the old bkl */
	struct mutex lock;

	/* Owner of the lock (can be recursive) */
	struct task_struct *lock_owner;

	/* Depth of the lock, start from -1 like the bkl */
	int lock_depth;

	struct workqueue_struct *commit_wq;

	/* Comment? -Hans */
	void (*end_io_handler) (struct buffer_head *, int);

	/*
	 * pointer to function which is used to sort names in directory.
	 * Set on mount
	 */
	hashf_t s_hash_function;

	/* reiserfs's mount options are set here */
	unsigned long s_mount_opt;

	/* This is a structure that describes block allocator options */
	struct {
		/* Bitfield for enable/disable kind of options */
		unsigned long bits;

		/*
		 * size started from which we consider file
		 * to be a large one (in blocks)
		 */
		unsigned long large_file_size;

		int border;	/* percentage of disk, border takes */

		/*
		 * Minimal file size (in blocks) starting
		 * from which we do preallocations
		 */
		int preallocmin;

		/*
		 * Number of blocks we try to prealloc when file
		 * reaches preallocmin size (in blocks) or prealloc_list
		 is empty.
		 */
		int preallocsize;
	} s_alloc_options;

	/* Comment? -Hans */
	wait_queue_head_t s_wait;
	/* increased by one every time the  tree gets re-balanced */
	atomic_t s_generation_counter;

	/* File system properties. Currently holds on-disk FS format */
	unsigned long s_properties;

	/* session statistics */
	int s_disk_reads;
	int s_disk_writes;
	int s_fix_nodes;
	int s_do_balance;
	int s_unneeded_left_neighbor;
	int s_good_search_by_key_reada;
	int s_bmaps;
	int s_bmaps_without_search;
	int s_direct2indirect;
	int s_indirect2direct;

	/*
	 * set up when it's ok for reiserfs_read_inode2() to read from
	 * disk inode with nlink==0. Currently this is only used during
	 * finish_unfinished() processing at mount time
	 */
	int s_is_unlinked_ok;

	reiserfs_proc_info_data_t s_proc_info_data;
	struct proc_dir_entry *procdir;

	/* amount of blocks reserved for further allocations */
	int reserved_blocks;


	/* this lock on now only used to protect reserved_blocks variable */
	spinlock_t bitmap_lock;
	struct dentry *priv_root;	/* root of /.reiserfs_priv */
	struct dentry *xattr_root;	/* root of /.reiserfs_priv/xattrs */
	int j_errno;

	int work_queued;              /* non-zero delayed work is queued */
	struct delayed_work old_work; /* old transactions flush delayed work */
	spinlock_t old_work_lock;     /* protects old_work and work_queued */

#ifdef CONFIG_QUOTA
	char *s_qf_names[REISERFS_MAXQUOTAS];
	int s_jquota_fmt;
#endif
	char *s_jdev;		/* Stored jdev for mount option showing */
#ifdef CONFIG_REISERFS_CHECK

	/*
	 * Detects whether more than one copy of tb exists per superblock
	 * as a means of checking whether do_balance is executing
	 * concurrently against another tree reader/writer on a same
	 * mount point.
	 */
	struct tree_balance *cur_tb;
#endif
};

/* Definitions of reiserfs on-disk properties: */
#define REISERFS_3_5 0
#define REISERFS_3_6 1
#define REISERFS_OLD_FORMAT 2

/* Mount options */
enum reiserfs_mount_options {
	/* large tails will be created in a session */
	REISERFS_LARGETAIL,
	/*
	 * small (for files less than block size) tails will
	 * be created in a session
	 */
	REISERFS_SMALLTAIL,

	/* replay journal and return 0. Use by fsck */
	REPLAYONLY,

	/*
	 * -o conv: causes conversion of old format super block to the
	 * new format. If not specified - old partition will be dealt
	 * with in a manner of 3.5.x
	 */
	REISERFS_CONVERT,

	/*
	 * -o hash={tea, rupasov, r5, detect} is meant for properly mounting
	 * reiserfs disks from 3.5.19 or earlier.  99% of the time, this
	 * option is not required.  If the normal autodection code can't
	 * determine which hash to use (because both hashes had the same
	 * value for a file) use this option to force a specific hash.
	 * It won't allow you to override the existing hash on the FS, so
	 * if you have a tea hash disk, and mount with -o hash=rupasov,
	 * the mount will fail.
	 */
	FORCE_TEA_HASH,		/* try to force tea hash on mount */
	FORCE_RUPASOV_HASH,	/* try to force rupasov hash on mount */
	FORCE_R5_HASH,		/* try to force rupasov hash on mount */
	FORCE_HASH_DETECT,	/* try to detect hash function on mount */

	REISERFS_DATA_LOG,
	REISERFS_DATA_ORDERED,
	REISERFS_DATA_WRITEBACK,

	/*
	 * used for testing experimental features, makes benchmarking new
	 * features with and without more convenient, should never be used by
	 * users in any code shipped to users (ideally)
	 */

	REISERFS_NO_BORDER,
	REISERFS_NO_UNHASHED_RELOCATION,
	REISERFS_HASHED_RELOCATION,
	REISERFS_ATTRS,
	REISERFS_XATTRS_USER,
	REISERFS_POSIXACL,
	REISERFS_EXPOSE_PRIVROOT,
	REISERFS_BARRIER_NONE,
	REISERFS_BARRIER_FLUSH,

	/* Actions on error */
	REISERFS_ERROR_PANIC,
	REISERFS_ERROR_RO,
	REISERFS_ERROR_CONTINUE,

	REISERFS_USRQUOTA,	/* User quota option specified */
	REISERFS_GRPQUOTA,	/* Group quota option specified */

	REISERFS_TEST1,
	REISERFS_TEST2,
	REISERFS_TEST3,
	REISERFS_TEST4,
	REISERFS_UNSUPPORTED_OPT,
};

#define reiserfs_r5_hash(s) (REISERFS_SB(s)->s_mount_opt & (1 << FORCE_R5_HASH))
#define reiserfs_rupasov_hash(s) (REISERFS_SB(s)->s_mount_opt & (1 << FORCE_RUPASOV_HASH))
#define reiserfs_tea_hash(s) (REISERFS_SB(s)->s_mount_opt & (1 << FORCE_TEA_HASH))
#define reiserfs_hash_detect(s) (REISERFS_SB(s)->s_mount_opt & (1 << FORCE_HASH_DETECT))
#define reiserfs_no_border(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_NO_BORDER))
#define reiserfs_no_unhashed_relocation(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_NO_UNHASHED_RELOCATION))
#define reiserfs_hashed_relocation(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_HASHED_RELOCATION))
#define reiserfs_test4(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_TEST4))

#define have_large_tails(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_LARGETAIL))
#define have_small_tails(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_SMALLTAIL))
#define replay_only(s) (REISERFS_SB(s)->s_mount_opt & (1 << REPLAYONLY))
#define reiserfs_attrs(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_ATTRS))
#define old_format_only(s) (REISERFS_SB(s)->s_properties & (1 << REISERFS_3_5))
#define convert_reiserfs(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_CONVERT))
#define reiserfs_data_log(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_DATA_LOG))
#define reiserfs_data_ordered(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_DATA_ORDERED))
#define reiserfs_data_writeback(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_DATA_WRITEBACK))
#define reiserfs_xattrs_user(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_XATTRS_USER))
#define reiserfs_posixacl(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_POSIXACL))
#define reiserfs_expose_privroot(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_EXPOSE_PRIVROOT))
#define reiserfs_xattrs_optional(s) (reiserfs_xattrs_user(s) || reiserfs_posixacl(s))
#define reiserfs_barrier_none(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_BARRIER_NONE))
#define reiserfs_barrier_flush(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_BARRIER_FLUSH))

#define reiserfs_error_panic(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_ERROR_PANIC))
#define reiserfs_error_ro(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_ERROR_RO))

void reiserfs_file_buffer(struct buffer_head *bh, int list);
extern struct file_system_type reiserfs_fs_type;
int reiserfs_resize(struct super_block *, unsigned long);

#define CARRY_ON                0
#define SCHEDULE_OCCURRED       1

#define SB_BUFFER_WITH_SB(s) (REISERFS_SB(s)->s_sbh)
#define SB_JOURNAL(s) (REISERFS_SB(s)->s_journal)
#define SB_JOURNAL_1st_RESERVED_BLOCK(s) (SB_JOURNAL(s)->j_1st_reserved_block)
#define SB_JOURNAL_LEN_FREE(s) (SB_JOURNAL(s)->j_journal_len_free)
#define SB_AP_BITMAP(s) (REISERFS_SB(s)->s_ap_bitmap)

#define SB_DISK_JOURNAL_HEAD(s) (SB_JOURNAL(s)->j_header_bh->)

#define reiserfs_is_journal_aborted(journal) (unlikely (__reiserfs_is_journal_aborted (journal)))
static inline int __reiserfs_is_journal_aborted(struct reiserfs_journal
						*journal)
{
	return test_bit(J_ABORTED, &journal->j_state);
}

/*
 * Locking primitives. The write lock is a per superblock
 * special mutex that has properties close to the Big Kernel Lock
 * which was used in the previous locking scheme.
 */
void reiserfs_write_lock(struct super_block *s);
void reiserfs_write_unlock(struct super_block *s);
int __must_check reiserfs_write_unlock_nested(struct super_block *s);
void reiserfs_write_lock_nested(struct super_block *s, int depth);

#ifdef CONFIG_REISERFS_CHECK
void reiserfs_lock_check_recursive(struct super_block *s);
#else
static inline void reiserfs_lock_check_recursive(struct super_block *s) { }
#endif

/*
 * Several mutexes depend on the write lock.
 * However sometimes we want to relax the write lock while we hold
 * these mutexes, according to the release/reacquire on schedule()
 * properties of the Bkl that were used.
 * Reiserfs performances and locking were based on this scheme.
 * Now that the write lock is a mutex and not the bkl anymore, doing so
 * may result in a deadlock:
 *
 * A acquire write_lock
 * A acquire j_commit_mutex
 * A release write_lock and wait for something
 * B acquire write_lock
 * B can't acquire j_commit_mutex and sleep
 * A can't acquire write lock anymore
 * deadlock
 *
 * What we do here is avoiding such deadlock by playing the same game
 * than the Bkl: if we can't acquire a mutex that depends on the write lock,
 * we release the write lock, wait a bit and then retry.
 *
 * The mutexes concerned by this hack are:
 * - The commit mutex of a journal list
 * - The flush mutex
 * - The journal lock
 * - The inode mutex
 */
static inline void reiserfs_mutex_lock_safe(struct mutex *m,
					    struct super_block *s)
{
	int depth;

	depth = reiserfs_write_unlock_nested(s);
	mutex_lock(m);
	reiserfs_write_lock_nested(s, depth);
}

static inline void
reiserfs_mutex_lock_nested_safe(struct mutex *m, unsigned int subclass,
				struct super_block *s)
{
	int depth;

	depth = reiserfs_write_unlock_nested(s);
	mutex_lock_nested(m, subclass);
	reiserfs_write_lock_nested(s, depth);
}

static inline void
reiserfs_down_read_safe(struct rw_semaphore *sem, struct super_block *s)
{
       int depth;
       depth = reiserfs_write_unlock_nested(s);
       down_read(sem);
       reiserfs_write_lock_nested(s, depth);
}

/*
 * When we schedule, we usually want to also release the write lock,
 * according to the previous bkl based locking scheme of reiserfs.
 */
static inline void reiserfs_cond_resched(struct super_block *s)
{
	if (need_resched()) {
		int depth;

		depth = reiserfs_write_unlock_nested(s);
		schedule();
		reiserfs_write_lock_nested(s, depth);
	}
}

struct fid;

/*
 * in reading the #defines, it may help to understand that they employ
 *  the following abbreviations:
 *
 *  B = Buffer
 *  I = Item header
 *  H = Height within the tree (should be changed to LEV)
 *  N = Number of the item in the node
 *  STAT = stat data
 *  DEH = Directory Entry Header
 *  EC = Entry Count
 *  E = Entry number
 *  UL = Unsigned Long
 *  BLKH = BLocK Header
 *  UNFM = UNForMatted node
 *  DC = Disk Child
 *  P = Path
 *
 *  These #defines are named by concatenating these abbreviations,
 *  where first comes the arguments, and last comes the return value,
 *  of the macro.
 */

#define USE_INODE_GENERATION_COUNTER

#define REISERFS_PREALLOCATE
#define DISPLACE_NEW_PACKING_LOCALITIES
#define PREALLOCATION_SIZE 9

/* n must be power of 2 */
#define _ROUND_UP(x,n) (((x)+(n)-1u) & ~((n)-1u))

/*
 * to be ok for alpha and others we have to align structures to 8 byte
 * boundary.
 * FIXME: do not change 4 by anything else: there is code which relies on that
 */
#define ROUND_UP(x) _ROUND_UP(x,8LL)

/*
 * debug levels.  Right now, CONFIG_REISERFS_CHECK means print all debug
 * messages.
 */
#define REISERFS_DEBUG_CODE 5	/* extra messages to help find/debug errors */

void __reiserfs_warning(struct super_block *s, const char *id,
			 const char *func, const char *fmt, ...);
#define reiserfs_warning(s, id, fmt, args...) \
	 __reiserfs_warning(s, id, __func__, fmt, ##args)
/* assertions handling */

/* always check a condition and panic if it's false. */
#define __RASSERT(cond, scond, format, args...)			\
do {									\
	if (!(cond))							\
		reiserfs_panic(NULL, "assertion failure", "(" #cond ") at " \
			       __FILE__ ":%i:%s: " format "\n",		\
			       __LINE__, __func__ , ##args);		\
} while (0)

#define RASSERT(cond, format, args...) __RASSERT(cond, #cond, format, ##args)

#if defined( CONFIG_REISERFS_CHECK )
#define RFALSE(cond, format, args...) __RASSERT(!(cond), "!(" #cond ")", format, ##args)
#else
#define RFALSE( cond, format, args... ) do {;} while( 0 )
#endif

#define CONSTF __attribute_const__
/*
 * Disk Data Structures
 */

/***************************************************************************
 *                             SUPER BLOCK                                 *
 ***************************************************************************/

/*
 * Structure of super block on disk, a version of which in RAM is often
 * accessed as REISERFS_SB(s)->s_rs. The version in RAM is part of a larger
 * structure containing fields never written to disk.
 */
#define UNSET_HASH 0	/* Detect hash on disk */
#define TEA_HASH  1
#define YURA_HASH 2
#define R5_HASH   3
#define DEFAULT_HASH R5_HASH

struct journal_params {
	/* where does journal start from on its * device */
	__le32 jp_journal_1st_block;

	/* journal device st_rdev */
	__le32 jp_journal_dev;

	/* size of the journal */
	__le32 jp_journal_size;

	/* max number of blocks in a transaction. */
	__le32 jp_journal_trans_max;

	/*
	 * random value made on fs creation
	 * (this was sb_journal_block_count)
	 */
	__le32 jp_journal_magic;

	/* max number of blocks to batch into a trans */
	__le32 jp_journal_max_batch;

	/* in seconds, how old can an async  commit be */
	__le32 jp_journal_max_commit_age;

	/* in seconds, how old can a transaction be */
	__le32 jp_journal_max_trans_age;
};

/* this is the super from 3.5.X, where X >= 10 */
struct reiserfs_super_block_v1 {
	__le32 s_block_count;	/* blocks count         */
	__le32 s_free_blocks;	/* free blocks count    */
	__le32 s_root_block;	/* root block number    */
	struct journal_params s_journal;
	__le16 s_blocksize;	/* block size */

	/* max size of object id array, see get_objectid() commentary  */
	__le16 s_oid_maxsize;
	__le16 s_oid_cursize;	/* current size of object id array */

	/* this is set to 1 when filesystem was umounted, to 2 - when not */
	__le16 s_umount_state;

	/*
	 * reiserfs magic string indicates that file system is reiserfs:
	 * "ReIsErFs" or "ReIsEr2Fs" or "ReIsEr3Fs"
	 */
	char s_magic[10];

	/*
	 * it is set to used by fsck to mark which
	 * phase of rebuilding is done
	 */
	__le16 s_fs_state;
	/*
	 * indicate, what hash function is being use
	 * to sort names in a directory
	 */
	__le32 s_hash_function_code;
	__le16 s_tree_height;	/* height of disk tree */

	/*
	 * amount of bitmap blocks needed to address
	 * each block of file system
	 */
	__le16 s_bmap_nr;

	/*
	 * this field is only reliable on filesystem with non-standard journal
	 */
	__le16 s_version;

	/*
	 * size in blocks of journal area on main device, we need to
	 * keep after making fs with non-standard journal
	 */
	__le16 s_reserved_for_journal;
} __attribute__ ((__packed__));

#define SB_SIZE_V1 (sizeof(struct reiserfs_super_block_v1))

/* this is the on disk super block */
struct reiserfs_super_block {
	struct reiserfs_super_block_v1 s_v1;
	__le32 s_inode_generation;

	/* Right now used only by inode-attributes, if enabled */
	__le32 s_flags;

	unsigned char s_uuid[16];	/* filesystem unique identifier */
	unsigned char s_label[16];	/* filesystem volume label */
	__le16 s_mnt_count;		/* Count of mounts since last fsck */
	__le16 s_max_mnt_count;		/* Maximum mounts before check */
	__le32 s_lastcheck;		/* Timestamp of last fsck */
	__le32 s_check_interval;	/* Interval between checks */

	/*
	 * zero filled by mkreiserfs and reiserfs_convert_objectid_map_v1()
	 * so any additions must be updated there as well. */
	char s_unused[76];
} __attribute__ ((__packed__));

#define SB_SIZE (sizeof(struct reiserfs_super_block))

#define REISERFS_VERSION_1 0
#define REISERFS_VERSION_2 2

/* on-disk super block fields converted to cpu form */
#define SB_DISK_SUPER_BLOCK(s) (REISERFS_SB(s)->s_rs)
#define SB_V1_DISK_SUPER_BLOCK(s) (&(SB_DISK_SUPER_BLOCK(s)->s_v1))
#define SB_BLOCKSIZE(s) \
        le32_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_blocksize))
#define SB_BLOCK_COUNT(s) \
        le32_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_block_count))
#define SB_FREE_BLOCKS(s) \
        le32_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_free_blocks))
#define SB_REISERFS_MAGIC(s) \
        (SB_V1_DISK_SUPER_BLOCK(s)->s_magic)
#define SB_ROOT_BLOCK(s) \
        le32_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_root_block))
#define SB_TREE_HEIGHT(s) \
        le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_tree_height))
#define SB_REISERFS_STATE(s) \
        le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_umount_state))
#define SB_VERSION(s) le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_version))
#define SB_BMAP_NR(s) le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_bmap_nr))

#define PUT_SB_BLOCK_COUNT(s, val) \
   do { SB_V1_DISK_SUPER_BLOCK(s)->s_block_count = cpu_to_le32(val); } while (0)
#define PUT_SB_FREE_BLOCKS(s, val) \
   do { SB_V1_DISK_SUPER_BLOCK(s)->s_free_blocks = cpu_to_le32(val); } while (0)
#define PUT_SB_ROOT_BLOCK(s, val) \
   do { SB_V1_DISK_SUPER_BLOCK(s)->s_root_block = cpu_to_le32(val); } while (0)
#define PUT_SB_TREE_HEIGHT(s, val) \
   do { SB_V1_DISK_SUPER_BLOCK(s)->s_tree_height = cpu_to_le16(val); } while (0)
#define PUT_SB_REISERFS_STATE(s, val) \
   do { SB_V1_DISK_SUPER_BLOCK(s)->s_umount_state = cpu_to_le16(val); } while (0)
#define PUT_SB_VERSION(s, val) \
   do { SB_V1_DISK_SUPER_BLOCK(s)->s_version = cpu_to_le16(val); } while (0)
#define PUT_SB_BMAP_NR(s, val) \
   do { SB_V1_DISK_SUPER_BLOCK(s)->s_bmap_nr = cpu_to_le16 (val); } while (0)

#define SB_ONDISK_JP(s) (&SB_V1_DISK_SUPER_BLOCK(s)->s_journal)
#define SB_ONDISK_JOURNAL_SIZE(s) \
         le32_to_cpu ((SB_ONDISK_JP(s)->jp_journal_size))
#define SB_ONDISK_JOURNAL_1st_BLOCK(s) \
         le32_to_cpu ((SB_ONDISK_JP(s)->jp_journal_1st_block))
#define SB_ONDISK_JOURNAL_DEVICE(s) \
         le32_to_cpu ((SB_ONDISK_JP(s)->jp_journal_dev))
#define SB_ONDISK_RESERVED_FOR_JOURNAL(s) \
         le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_reserved_for_journal))

#define is_block_in_log_or_reserved_area(s, block) \
         block >= SB_JOURNAL_1st_RESERVED_BLOCK(s) \
         && block < SB_JOURNAL_1st_RESERVED_BLOCK(s) +  \
         ((!is_reiserfs_jr(SB_DISK_SUPER_BLOCK(s)) ? \
         SB_ONDISK_JOURNAL_SIZE(s) + 1 : SB_ONDISK_RESERVED_FOR_JOURNAL(s)))

int is_reiserfs_3_5(struct reiserfs_super_block *rs);
int is_reiserfs_3_6(struct reiserfs_super_block *rs);
int is_reiserfs_jr(struct reiserfs_super_block *rs);

/*
 * ReiserFS leaves the first 64k unused, so that partition labels have
 * enough space.  If someone wants to write a fancy bootloader that
 * needs more than 64k, let us know, and this will be increased in size.
 * This number must be larger than than the largest block size on any
 * platform, or code will break.  -Hans
 */
#define REISERFS_DISK_OFFSET_IN_BYTES (64 * 1024)
#define REISERFS_FIRST_BLOCK unused_define
#define REISERFS_JOURNAL_OFFSET_IN_BYTES REISERFS_DISK_OFFSET_IN_BYTES

/* the spot for the super in versions 3.5 - 3.5.10 (inclusive) */
#define REISERFS_OLD_DISK_OFFSET_IN_BYTES (8 * 1024)

/* reiserfs internal error code (used by search_by_key and fix_nodes)) */
#define CARRY_ON      0
#define REPEAT_SEARCH -1
#define IO_ERROR      -2
#define NO_DISK_SPACE -3
#define NO_BALANCING_NEEDED  (-4)
#define NO_MORE_UNUSED_CONTIGUOUS_BLOCKS (-5)
#define QUOTA_EXCEEDED -6

typedef __u32 b_blocknr_t;
typedef __le32 unp_t;

struct unfm_nodeinfo {
	unp_t unfm_nodenum;
	unsigned short unfm_freespace;
};

/* there are two formats of keys: 3.5 and 3.6 */
#define KEY_FORMAT_3_5 0
#define KEY_FORMAT_3_6 1

/* there are two stat datas */
#define STAT_DATA_V1 0
#define STAT_DATA_V2 1

static inline struct reiserfs_inode_info *REISERFS_I(const struct inode *inode)
{
	return container_of(inode, struct reiserfs_inode_info, vfs_inode);
}

static inline struct reiserfs_sb_info *REISERFS_SB(const struct super_block *sb)
{
	return sb->s_fs_info;
}

/*
 * Don't trust REISERFS_SB(sb)->s_bmap_nr, it's a u16
 * which overflows on large file systems.
 */
static inline __u32 reiserfs_bmap_count(struct super_block *sb)
{
	return (SB_BLOCK_COUNT(sb) - 1) / (sb->s_blocksize * 8) + 1;
}

static inline int bmap_would_wrap(unsigned bmap_nr)
{
	return bmap_nr > ((1LL << 16) - 1);
}

/*
 * this says about version of key of all items (but stat data) the
 * object consists of
 */
#define get_inode_item_key_version( inode )                                    \
    ((REISERFS_I(inode)->i_flags & i_item_key_version_mask) ? KEY_FORMAT_3_6 : KEY_FORMAT_3_5)

#define set_inode_item_key_version( inode, version )                           \
         ({ if((version)==KEY_FORMAT_3_6)                                      \
                REISERFS_I(inode)->i_flags |= i_item_key_version_mask;      \
            else                                                               \
                REISERFS_I(inode)->i_flags &= ~i_item_key_version_mask; })

#define get_inode_sd_version(inode)                                            \
    ((REISERFS_I(inode)->i_flags & i_stat_data_version_mask) ? STAT_DATA_V2 : STAT_DATA_V1)

#define set_inode_sd_version(inode, version)                                   \
         ({ if((version)==STAT_DATA_V2)                                        \
                REISERFS_I(inode)->i_flags |= i_stat_data_version_mask;     \
            else                                                               \
                REISERFS_I(inode)->i_flags &= ~i_stat_data_version_mask; })

/*
 * This is an aggressive tail suppression policy, I am hoping it
 * improves our benchmarks. The principle behind it is that percentage
 * space saving is what matters, not absolute space saving.  This is
 * non-intuitive, but it helps to understand it if you consider that the
 * cost to access 4 blocks is not much more than the cost to access 1
 * block, if you have to do a seek and rotate.  A tail risks a
 * non-linear disk access that is significant as a percentage of total
 * time cost for a 4 block file and saves an amount of space that is
 * less significant as a percentage of space, or so goes the hypothesis.
 * -Hans
 */
#define STORE_TAIL_IN_UNFM_S1(n_file_size,n_tail_size,n_block_size) \
(\
  (!(n_tail_size)) || \
  (((n_tail_size) > MAX_DIRECT_ITEM_LEN(n_block_size)) || \
   ( (n_file_size) >= (n_block_size) * 4 ) || \
   ( ( (n_file_size) >= (n_block_size) * 3 ) && \
     ( (n_tail_size) >=   (MAX_DIRECT_ITEM_LEN(n_block_size))/4) ) || \
   ( ( (n_file_size) >= (n_block_size) * 2 ) && \
     ( (n_tail_size) >=   (MAX_DIRECT_ITEM_LEN(n_block_size))/2) ) || \
   ( ( (n_file_size) >= (n_block_size) ) && \
     ( (n_tail_size) >=   (MAX_DIRECT_ITEM_LEN(n_block_size) * 3)/4) ) ) \
)

/*
 * Another strategy for tails, this one means only create a tail if all the
 * file would fit into one DIRECT item.
 * Primary intention for this one is to increase performance by decreasing
 * seeking.
*/
#define STORE_TAIL_IN_UNFM_S2(n_file_size,n_tail_size,n_block_size) \
(\
  (!(n_tail_size)) || \
  (((n_file_size) > MAX_DIRECT_ITEM_LEN(n_block_size)) ) \
)

/*
 * values for s_umount_state field
 */
#define REISERFS_VALID_FS    1
#define REISERFS_ERROR_FS    2

/*
 * there are 5 item types currently
 */
#define TYPE_STAT_DATA 0
#define TYPE_INDIRECT 1
#define TYPE_DIRECT 2
#define TYPE_DIRENTRY 3
#define TYPE_MAXTYPE 3
#define TYPE_ANY 15		/* FIXME: comment is required */

/***************************************************************************
 *                       KEY & ITEM HEAD                                   *
 ***************************************************************************/

/* * directories use this key as well as old files */
struct offset_v1 {
	__le32 k_offset;
	__le32 k_uniqueness;
} __attribute__ ((__packed__));

struct offset_v2 {
	__le64 v;
} __attribute__ ((__packed__));

static inline __u16 offset_v2_k_type(const struct offset_v2 *v2)
{
	__u8 type = le64_to_cpu(v2->v) >> 60;
	return (type <= TYPE_MAXTYPE) ? type : TYPE_ANY;
}

static inline void set_offset_v2_k_type(struct offset_v2 *v2, int type)
{
	v2->v =
	    (v2->v & cpu_to_le64(~0ULL >> 4)) | cpu_to_le64((__u64) type << 60);
}

static inline loff_t offset_v2_k_offset(const struct offset_v2 *v2)
{
	return le64_to_cpu(v2->v) & (~0ULL >> 4);
}

static inline void set_offset_v2_k_offset(struct offset_v2 *v2, loff_t offset)
{
	offset &= (~0ULL >> 4);
	v2->v = (v2->v & cpu_to_le64(15ULL << 60)) | cpu_to_le64(offset);
}

/*
 * Key of an item determines its location in the S+tree, and
 * is composed of 4 components
 */
struct reiserfs_key {
	/* packing locality: by default parent directory object id */
	__le32 k_dir_id;

	__le32 k_objectid;	/* object identifier */
	union {
		struct offset_v1 k_offset_v1;
		struct offset_v2 k_offset_v2;
	} __attribute__ ((__packed__)) u;
} __attribute__ ((__packed__));

struct in_core_key {
	/* packing locality: by default parent directory object id */
	__u32 k_dir_id;
	__u32 k_objectid;	/* object identifier */
	__u64 k_offset;
	__u8 k_type;
};

struct cpu_key {
	struct in_core_key on_disk_key;
	int version;
	/* 3 in all cases but direct2indirect and indirect2direct conversion */
	int key_length;
};

/*
 * Our function for comparing keys can compare keys of different
 * lengths.  It takes as a parameter the length of the keys it is to
 * compare.  These defines are used in determining what is to be passed
 * to it as that parameter.
 */
#define REISERFS_FULL_KEY_LEN     4
#define REISERFS_SHORT_KEY_LEN    2

/* The result of the key compare */
#define FIRST_GREATER 1
#define SECOND_GREATER -1
#define KEYS_IDENTICAL 0
#define KEY_FOUND 1
#define KEY_NOT_FOUND 0

#define KEY_SIZE (sizeof(struct reiserfs_key))

/* return values for search_by_key and clones */
#define ITEM_FOUND 1
#define ITEM_NOT_FOUND 0
#define ENTRY_FOUND 1
#define ENTRY_NOT_FOUND 0
#define DIRECTORY_NOT_FOUND -1
#define REGULAR_FILE_FOUND -2
#define DIRECTORY_FOUND -3
#define BYTE_FOUND 1
#define BYTE_NOT_FOUND 0
#define FILE_NOT_FOUND -1

#define POSITION_FOUND 1
#define POSITION_NOT_FOUND 0

/* return values for reiserfs_find_entry and search_by_entry_key */
#define NAME_FOUND 1
#define NAME_NOT_FOUND 0
#define GOTO_PREVIOUS_ITEM 2
#define NAME_FOUND_INVISIBLE 3

/*
 * Everything in the filesystem is stored as a set of items.  The
 * item head contains the key of the item, its free space (for
 * indirect items) and specifies the location of the item itself
 * within the block.
 */

struct item_head {
	/*
	 * Everything in the tree is found by searching for it based on
	 * its key.
	 */
	struct reiserfs_key ih_key;
	union {
		/*
		 * The free space in the last unformatted node of an
		 * indirect item if this is an indirect item.  This
		 * equals 0xFFFF iff this is a direct item or stat data
		 * item. Note that the key, not this field, is used to
		 * determine the item type, and thus which field this
		 * union contains.
		 */
		__le16 ih_free_space_reserved;

		/*
		 * Iff this is a directory item, this field equals the
		 * number of directory entries in the directory item.
		 */
		__le16 ih_entry_count;
	} __attribute__ ((__packed__)) u;
	__le16 ih_item_len;	/* total size of the item body */

	/* an offset to the item body within the block */
	__le16 ih_item_location;

	/*
	 * 0 for all old items, 2 for new ones. Highest bit is set by fsck
	 * temporary, cleaned after all done
	 */
	__le16 ih_version;
} __attribute__ ((__packed__));
/* size of item header     */
#define IH_SIZE (sizeof(struct item_head))

#define ih_free_space(ih)            le16_to_cpu((ih)->u.ih_free_space_reserved)
#define ih_version(ih)               le16_to_cpu((ih)->ih_version)
#define ih_entry_count(ih)           le16_to_cpu((ih)->u.ih_entry_count)
#define ih_location(ih)              le16_to_cpu((ih)->ih_item_location)
#define ih_item_len(ih)              le16_to_cpu((ih)->ih_item_len)

#define put_ih_free_space(ih, val)   do { (ih)->u.ih_free_space_reserved = cpu_to_le16(val); } while(0)
#define put_ih_version(ih, val)      do { (ih)->ih_version = cpu_to_le16(val); } while (0)
#define put_ih_entry_count(ih, val)  do { (ih)->u.ih_entry_count = cpu_to_le16(val); } while (0)
#define put_ih_location(ih, val)     do { (ih)->ih_item_location = cpu_to_le16(val); } while (0)
#define put_ih_item_len(ih, val)     do { (ih)->ih_item_len = cpu_to_le16(val); } while (0)

#define unreachable_item(ih) (ih_version(ih) & (1 << 15))

#define get_ih_free_space(ih) (ih_version (ih) == KEY_FORMAT_3_6 ? 0 : ih_free_space (ih))
#define set_ih_free_space(ih,val) put_ih_free_space((ih), ((ih_version(ih) == KEY_FORMAT_3_6) ? 0 : (val)))

/*
 * these operate on indirect items, where you've got an array of ints
 * at a possibly unaligned location.  These are a noop on ia32
 *
 * p is the array of __u32, i is the index into the array, v is the value
 * to store there.
 */
#define get_block_num(p, i) get_unaligned_le32((p) + (i))
#define put_block_num(p, i, v) put_unaligned_le32((v), (p) + (i))

/* * in old version uniqueness field shows key type */
#define V1_SD_UNIQUENESS 0
#define V1_INDIRECT_UNIQUENESS 0xfffffffe
#define V1_DIRECT_UNIQUENESS 0xffffffff
#define V1_DIRENTRY_UNIQUENESS 500
#define V1_ANY_UNIQUENESS 555	/* FIXME: comment is required */

/* here are conversion routines */
static inline int uniqueness2type(__u32 uniqueness) CONSTF;
static inline int uniqueness2type(__u32 uniqueness)
{
	switch ((int)uniqueness) {
	case V1_SD_UNIQUENESS:
		return TYPE_STAT_DATA;
	case V1_INDIRECT_UNIQUENESS:
		return TYPE_INDIRECT;
	case V1_DIRECT_UNIQUENESS:
		return TYPE_DIRECT;
	case V1_DIRENTRY_UNIQUENESS:
		return TYPE_DIRENTRY;
	case V1_ANY_UNIQUENESS:
	default:
		return TYPE_ANY;
	}
}

static inline __u32 type2uniqueness(int type) CONSTF;
static inline __u32 type2uniqueness(int type)
{
	switch (type) {
	case TYPE_STAT_DATA:
		return V1_SD_UNIQUENESS;
	case TYPE_INDIRECT:
		return V1_INDIRECT_UNIQUENESS;
	case TYPE_DIRECT:
		return V1_DIRECT_UNIQUENESS;
	case TYPE_DIRENTRY:
		return V1_DIRENTRY_UNIQUENESS;
	case TYPE_ANY:
	default:
		return V1_ANY_UNIQUENESS;
	}
}

/*
 * key is pointer to on disk key which is stored in le, result is cpu,
 * there is no way to get version of object from key, so, provide
 * version to these defines
 */
static inline loff_t le_key_k_offset(int version,
				     const struct reiserfs_key *key)
{
	return (version == KEY_FORMAT_3_5) ?
	    le32_to_cpu(key->u.k_offset_v1.k_offset) :
	    offset_v2_k_offset(&(key->u.k_offset_v2));
}

static inline loff_t le_ih_k_offset(const struct item_head *ih)
{
	return le_key_k_offset(ih_version(ih), &(ih->ih_key));
}

static inline loff_t le_key_k_type(int version, const struct reiserfs_key *key)
{
	if (version == KEY_FORMAT_3_5) {
		loff_t val = le32_to_cpu(key->u.k_offset_v1.k_uniqueness);
		return uniqueness2type(val);
	} else
		return offset_v2_k_type(&(key->u.k_offset_v2));
}

static inline loff_t le_ih_k_type(const struct item_head *ih)
{
	return le_key_k_type(ih_version(ih), &(ih->ih_key));
}

static inline void set_le_key_k_offset(int version, struct reiserfs_key *key,
				       loff_t offset)
{
	if (version == KEY_FORMAT_3_5)
		key->u.k_offset_v1.k_offset = cpu_to_le32(offset);
	else
		set_offset_v2_k_offset(&key->u.k_offset_v2, offset);
}

static inline void add_le_key_k_offset(int version, struct reiserfs_key *key,
				       loff_t offset)
{
	set_le_key_k_offset(version, key,
			    le_key_k_offset(version, key) + offset);
}

static inline void add_le_ih_k_offset(struct item_head *ih, loff_t offset)
{
	add_le_key_k_offset(ih_version(ih), &(ih->ih_key), offset);
}

static inline void set_le_ih_k_offset(struct item_head *ih, loff_t offset)
{
	set_le_key_k_offset(ih_version(ih), &(ih->ih_key), offset);
}

static inline void set_le_key_k_type(int version, struct reiserfs_key *key,
				     int type)
{
	if (version == KEY_FORMAT_3_5) {
		type = type2uniqueness(type);
		key->u.k_offset_v1.k_uniqueness = cpu_to_le32(type);
	} else
	       set_offset_v2_k_type(&key->u.k_offset_v2, type);
}

static inline void set_le_ih_k_type(struct item_head *ih, int type)
{
	set_le_key_k_type(ih_version(ih), &(ih->ih_key), type);
}

static inline int is_direntry_le_key(int version, struct reiserfs_key *key)
{
	return le_key_k_type(version, key) == TYPE_DIRENTRY;
}

static inline int is_direct_le_key(int version, struct reiserfs_key *key)
{
	return le_key_k_type(version, key) == TYPE_DIRECT;
}

static inline int is_indirect_le_key(int version, struct reiserfs_key *key)
{
	return le_key_k_type(version, key) == TYPE_INDIRECT;
}

static inline int is_statdata_le_key(int version, struct reiserfs_key *key)
{
	return le_key_k_type(version, key) == TYPE_STAT_DATA;
}

/* item header has version.  */
static inline int is_direntry_le_ih(struct item_head *ih)
{
	return is_direntry_le_key(ih_version(ih), &ih->ih_key);
}

static inline int is_direct_le_ih(struct item_head *ih)
{
	return is_direct_le_key(ih_version(ih), &ih->ih_key);
}

static inline int is_indirect_le_ih(struct item_head *ih)
{
	return is_indirect_le_key(ih_version(ih), &ih->ih_key);
}

static inline int is_statdata_le_ih(struct item_head *ih)
{
	return is_statdata_le_key(ih_version(ih), &ih->ih_key);
}

/* key is pointer to cpu key, result is cpu */
static inline loff_t cpu_key_k_offset(const struct cpu_key *key)
{
	return key->on_disk_key.k_offset;
}

static inline loff_t cpu_key_k_type(const struct cpu_key *key)
{
	return key->on_disk_key.k_type;
}

static inline void set_cpu_key_k_offset(struct cpu_key *key, loff_t offset)
{
	key->on_disk_key.k_offset = offset;
}

static inline void set_cpu_key_k_type(struct cpu_key *key, int type)
{
	key->on_disk_key.k_type = type;
}

static inline void cpu_key_k_offset_dec(struct cpu_key *key)
{
	key->on_disk_key.k_offset--;
}

#define is_direntry_cpu_key(key) (cpu_key_k_type (key) == TYPE_DIRENTRY)
#define is_direct_cpu_key(key) (cpu_key_k_type (key) == TYPE_DIRECT)
#define is_indirect_cpu_key(key) (cpu_key_k_type (key) == TYPE_INDIRECT)
#define is_statdata_cpu_key(key) (cpu_key_k_type (key) == TYPE_STAT_DATA)

/* are these used ? */
#define is_direntry_cpu_ih(ih) (is_direntry_cpu_key (&((ih)->ih_key)))
#define is_direct_cpu_ih(ih) (is_direct_cpu_key (&((ih)->ih_key)))
#define is_indirect_cpu_ih(ih) (is_indirect_cpu_key (&((ih)->ih_key)))
#define is_statdata_cpu_ih(ih) (is_statdata_cpu_key (&((ih)->ih_key)))

#define I_K_KEY_IN_ITEM(ih, key, n_blocksize) \
    (!COMP_SHORT_KEYS(ih, key) && \
	  I_OFF_BYTE_IN_ITEM(ih, k_offset(key), n_blocksize))

/* maximal length of item */
#define MAX_ITEM_LEN(block_size) (block_size - BLKH_SIZE - IH_SIZE)
#define MIN_ITEM_LEN 1

/* object identifier for root dir */
#define REISERFS_ROOT_OBJECTID 2
#define REISERFS_ROOT_PARENT_OBJECTID 1

extern struct reiserfs_key root_key;

/*
 * Picture represents a leaf of the S+tree
 *  ______________________________________________________
 * |      |  Array of     |                   |           |
 * |Block |  Object-Item  |      F r e e      |  Objects- |
 * | head |  Headers      |     S p a c e     |   Items   |
 * |______|_______________|___________________|___________|
 */

/*
 * Header of a disk block.  More precisely, header of a formatted leaf
 * or internal node, and not the header of an unformatted node.
 */
struct block_head {
	__le16 blk_level;	/* Level of a block in the tree. */
	__le16 blk_nr_item;	/* Number of keys/items in a block. */
	__le16 blk_free_space;	/* Block free space in bytes. */
	__le16 blk_reserved;
	/* dump this in v4/planA */

	/* kept only for compatibility */
	struct reiserfs_key blk_right_delim_key;
};

#define BLKH_SIZE                     (sizeof(struct block_head))
#define blkh_level(p_blkh)            (le16_to_cpu((p_blkh)->blk_level))
#define blkh_nr_item(p_blkh)          (le16_to_cpu((p_blkh)->blk_nr_item))
#define blkh_free_space(p_blkh)       (le16_to_cpu((p_blkh)->blk_free_space))
#define blkh_reserved(p_blkh)         (le16_to_cpu((p_blkh)->blk_reserved))
#define set_blkh_level(p_blkh,val)    ((p_blkh)->blk_level = cpu_to_le16(val))
#define set_blkh_nr_item(p_blkh,val)  ((p_blkh)->blk_nr_item = cpu_to_le16(val))
#define set_blkh_free_space(p_blkh,val) ((p_blkh)->blk_free_space = cpu_to_le16(val))
#define set_blkh_reserved(p_blkh,val) ((p_blkh)->blk_reserved = cpu_to_le16(val))
#define blkh_right_delim_key(p_blkh)  ((p_blkh)->blk_right_delim_key)
#define set_blkh_right_delim_key(p_blkh,val)  ((p_blkh)->blk_right_delim_key = val)

/* values for blk_level field of the struct block_head */

/*
 * When node gets removed from the tree its blk_level is set to FREE_LEVEL.
 * It is then  used to see whether the node is still in the tree
 */
#define FREE_LEVEL 0

#define DISK_LEAF_NODE_LEVEL  1	/* Leaf node level. */

/*
 * Given the buffer head of a formatted node, resolve to the
 * block head of that node.
 */
#define B_BLK_HEAD(bh)			((struct block_head *)((bh)->b_data))
/* Number of items that are in buffer. */
#define B_NR_ITEMS(bh)			(blkh_nr_item(B_BLK_HEAD(bh)))
#define B_LEVEL(bh)			(blkh_level(B_BLK_HEAD(bh)))
#define B_FREE_SPACE(bh)		(blkh_free_space(B_BLK_HEAD(bh)))

#define PUT_B_NR_ITEMS(bh, val)		do { set_blkh_nr_item(B_BLK_HEAD(bh), val); } while (0)
#define PUT_B_LEVEL(bh, val)		do { set_blkh_level(B_BLK_HEAD(bh), val); } while (0)
#define PUT_B_FREE_SPACE(bh, val)	do { set_blkh_free_space(B_BLK_HEAD(bh), val); } while (0)

/* Get right delimiting key. -- little endian */
#define B_PRIGHT_DELIM_KEY(bh)		(&(blk_right_delim_key(B_BLK_HEAD(bh))))

/* Does the buffer contain a disk leaf. */
#define B_IS_ITEMS_LEVEL(bh)		(B_LEVEL(bh) == DISK_LEAF_NODE_LEVEL)

/* Does the buffer contain a disk internal node */
#define B_IS_KEYS_LEVEL(bh)      (B_LEVEL(bh) > DISK_LEAF_NODE_LEVEL \
					    && B_LEVEL(bh) <= MAX_HEIGHT)

/***************************************************************************
 *                             STAT DATA                                   *
 ***************************************************************************/

/*
 * old stat data is 32 bytes long. We are going to distinguish new one by
 * different size
*/
struct stat_data_v1 {
	__le16 sd_mode;		/* file type, permissions */
	__le16 sd_nlink;	/* number of hard links */
	__le16 sd_uid;		/* owner */
	__le16 sd_gid;		/* group */
	__le32 sd_size;		/* file size */
	__le32 sd_atime;	/* time of last access */
	__le32 sd_mtime;	/* time file was last modified  */

	/*
	 * time inode (stat data) was last changed
	 * (except changes to sd_atime and sd_mtime)
	 */
	__le32 sd_ctime;
	union {
		__le32 sd_rdev;
		__le32 sd_blocks;	/* number of blocks file uses */
	} __attribute__ ((__packed__)) u;

	/*
	 * first byte of file which is stored in a direct item: except that if
	 * it equals 1 it is a symlink and if it equals ~(__u32)0 there is no
	 * direct item.  The existence of this field really grates on me.
	 * Let's replace it with a macro based on sd_size and our tail
	 * suppression policy.  Someday.  -Hans
	 */
	__le32 sd_first_direct_byte;
} __attribute__ ((__packed__));

#define SD_V1_SIZE              (sizeof(struct stat_data_v1))
#define stat_data_v1(ih)        (ih_version (ih) == KEY_FORMAT_3_5)
#define sd_v1_mode(sdp)         (le16_to_cpu((sdp)->sd_mode))
#define set_sd_v1_mode(sdp,v)   ((sdp)->sd_mode = cpu_to_le16(v))
#define sd_v1_nlink(sdp)        (le16_to_cpu((sdp)->sd_nlink))
#define set_sd_v1_nlink(sdp,v)  ((sdp)->sd_nlink = cpu_to_le16(v))
#define sd_v1_uid(sdp)          (le16_to_cpu((sdp)->sd_uid))
#define set_sd_v1_uid(sdp,v)    ((sdp)->sd_uid = cpu_to_le16(v))
#define sd_v1_gid(sdp)          (le16_to_cpu((sdp)->sd_gid))
#define set_sd_v1_gid(sdp,v)    ((sdp)->sd_gid = cpu_to_le16(v))
#define sd_v1_size(sdp)         (le32_to_cpu((sdp)->sd_size))
#define set_sd_v1_size(sdp,v)   ((sdp)->sd_size = cpu_to_le32(v))
#define sd_v1_atime(sdp)        (le32_to_cpu((sdp)->sd_atime))
#define set_sd_v1_atime(sdp,v)  ((sdp)->sd_atime = cpu_to_le32(v))
#define sd_v1_mtime(sdp)        (le32_to_cpu((sdp)->sd_mtime))
#define set_sd_v1_mtime(sdp,v)  ((sdp)->sd_mtime = cpu_to_le32(v))
#define sd_v1_ctime(sdp)        (le32_to_cpu((sdp)->sd_ctime))
#define set_sd_v1_ctime(sdp,v)  ((sdp)->sd_ctime = cpu_to_le32(v))
#define sd_v1_rdev(sdp)         (le32_to_cpu((sdp)->u.sd_rdev))
#define set_sd_v1_rdev(sdp,v)   ((sdp)->u.sd_rdev = cpu_to_le32(v))
#define sd_v1_blocks(sdp)       (le32_to_cpu((sdp)->u.sd_blocks))
#define set_sd_v1_blocks(sdp,v) ((sdp)->u.sd_blocks = cpu_to_le32(v))
#define sd_v1_first_direct_byte(sdp) \
                                (le32_to_cpu((sdp)->sd_first_direct_byte))
#define set_sd_v1_first_direct_byte(sdp,v) \
                                ((sdp)->sd_first_direct_byte = cpu_to_le32(v))

/* inode flags stored in sd_attrs (nee sd_reserved) */

/*
 * we want common flags to have the same values as in ext2,
 * so chattr(1) will work without problems
 */
#define REISERFS_IMMUTABLE_FL FS_IMMUTABLE_FL
#define REISERFS_APPEND_FL    FS_APPEND_FL
#define REISERFS_SYNC_FL      FS_SYNC_FL
#define REISERFS_NOATIME_FL   FS_NOATIME_FL
#define REISERFS_NODUMP_FL    FS_NODUMP_FL
#define REISERFS_SECRM_FL     FS_SECRM_FL
#define REISERFS_UNRM_FL      FS_UNRM_FL
#define REISERFS_COMPR_FL     FS_COMPR_FL
#define REISERFS_NOTAIL_FL    FS_NOTAIL_FL

/* persistent flags that file inherits from the parent directory */
#define REISERFS_INHERIT_MASK ( REISERFS_IMMUTABLE_FL |	\
				REISERFS_SYNC_FL |	\
				REISERFS_NOATIME_FL |	\
				REISERFS_NODUMP_FL |	\
				REISERFS_SECRM_FL |	\
				REISERFS_COMPR_FL |	\
				REISERFS_NOTAIL_FL )

/*
 * Stat Data on disk (reiserfs version of UFS disk inode minus the
 * address blocks)
 */
struct stat_data {
	__le16 sd_mode;		/* file type, permissions */
	__le16 sd_attrs;	/* persistent inode flags */
	__le32 sd_nlink;	/* number of hard links */
	__le64 sd_size;		/* file size */
	__le32 sd_uid;		/* owner */
	__le32 sd_gid;		/* group */
	__le32 sd_atime;	/* time of last access */
	__le32 sd_mtime;	/* time file was last modified  */

	/*
	 * time inode (stat data) was last changed
	 * (except changes to sd_atime and sd_mtime)
	 */
	__le32 sd_ctime;
	__le32 sd_blocks;
	union {
		__le32 sd_rdev;
		__le32 sd_generation;
	} __attribute__ ((__packed__)) u;
} __attribute__ ((__packed__));

/* this is 44 bytes long */
#define SD_SIZE (sizeof(struct stat_data))
#define SD_V2_SIZE              SD_SIZE
#define stat_data_v2(ih)        (ih_version (ih) == KEY_FORMAT_3_6)
#define sd_v2_mode(sdp)         (le16_to_cpu((sdp)->sd_mode))
#define set_sd_v2_mode(sdp,v)   ((sdp)->sd_mode = cpu_to_le16(v))
/* sd_reserved */
/* set_sd_reserved */
#define sd_v2_nlink(sdp)        (le32_to_cpu((sdp)->sd_nlink))
#define set_sd_v2_nlink(sdp,v)  ((sdp)->sd_nlink = cpu_to_le32(v))
#define sd_v2_size(sdp)         (le64_to_cpu((sdp)->sd_size))
#define set_sd_v2_size(sdp,v)   ((sdp)->sd_size = cpu_to_le64(v))
#define sd_v2_uid(sdp)          (le32_to_cpu((sdp)->sd_uid))
#define set_sd_v2_uid(sdp,v)    ((sdp)->sd_uid = cpu_to_le32(v))
#define sd_v2_gid(sdp)          (le32_to_cpu((sdp)->sd_gid))
#define set_sd_v2_gid(sdp,v)    ((sdp)->sd_gid = cpu_to_le32(v))
#define sd_v2_atime(sdp)        (le32_to_cpu((sdp)->sd_atime))
#define set_sd_v2_atime(sdp,v)  ((sdp)->sd_atime = cpu_to_le32(v))
#define sd_v2_mtime(sdp)        (le32_to_cpu((sdp)->sd_mtime))
#define set_sd_v2_mtime(sdp,v)  ((sdp)->sd_mtime = cpu_to_le32(v))
#define sd_v2_ctime(sdp)        (le32_to_cpu((sdp)->sd_ctime))
#define set_sd_v2_ctime(sdp,v)  ((sdp)->sd_ctime = cpu_to_le32(v))
#define sd_v2_blocks(sdp)       (le32_to_cpu((sdp)->sd_blocks))
#define set_sd_v2_blocks(sdp,v) ((sdp)->sd_blocks = cpu_to_le32(v))
#define sd_v2_rdev(sdp)         (le32_to_cpu((sdp)->u.sd_rdev))
#define set_sd_v2_rdev(sdp,v)   ((sdp)->u.sd_rdev = cpu_to_le32(v))
#define sd_v2_generation(sdp)   (le32_to_cpu((sdp)->u.sd_generation))
#define set_sd_v2_generation(sdp,v) ((sdp)->u.sd_generation = cpu_to_le32(v))
#define sd_v2_attrs(sdp)         (le16_to_cpu((sdp)->sd_attrs))
#define set_sd_v2_attrs(sdp,v)   ((sdp)->sd_attrs = cpu_to_le16(v))

/***************************************************************************
 *                      DIRECTORY STRUCTURE                                *
 ***************************************************************************/
/*
 * Picture represents the structure of directory items
 * ________________________________________________
 * |  Array of     |   |     |        |       |   |
 * | directory     |N-1| N-2 | ....   |   1st |0th|
 * | entry headers |   |     |        |       |   |
 * |_______________|___|_____|________|_______|___|
 *                  <----   directory entries         ------>
 *
 * First directory item has k_offset component 1. We store "." and ".."
 * in one item, always, we never split "." and ".." into differing
 * items.  This makes, among other things, the code for removing
 * directories simpler.
 */
#define SD_OFFSET  0
#define SD_UNIQUENESS 0
#define DOT_OFFSET 1
#define DOT_DOT_OFFSET 2
#define DIRENTRY_UNIQUENESS 500

#define FIRST_ITEM_OFFSET 1

/*
 * Q: How to get key of object pointed to by entry from entry?
 *
 * A: Each directory entry has its header. This header has deh_dir_id
 *    and deh_objectid fields, those are key of object, entry points to
 */

/*
 * NOT IMPLEMENTED:
 * Directory will someday contain stat data of object
 */

struct reiserfs_de_head {
	__le32 deh_offset;	/* third component of the directory entry key */

	/*
	 * objectid of the parent directory of the object, that is referenced
	 * by directory entry
	 */
	__le32 deh_dir_id;

	/* objectid of the object, that is referenced by directory entry */
	__le32 deh_objectid;
	__le16 deh_location;	/* offset of name in the whole item */

	/*
	 * whether 1) entry contains stat data (for future), and
	 * 2) whether entry is hidden (unlinked)
	 */
	__le16 deh_state;
} __attribute__ ((__packed__));
#define DEH_SIZE                  sizeof(struct reiserfs_de_head)
#define deh_offset(p_deh)         (le32_to_cpu((p_deh)->deh_offset))
#define deh_dir_id(p_deh)         (le32_to_cpu((p_deh)->deh_dir_id))
#define deh_objectid(p_deh)       (le32_to_cpu((p_deh)->deh_objectid))
#define deh_location(p_deh)       (le16_to_cpu((p_deh)->deh_location))
#define deh_state(p_deh)          (le16_to_cpu((p_deh)->deh_state))

#define put_deh_offset(p_deh,v)   ((p_deh)->deh_offset = cpu_to_le32((v)))
#define put_deh_dir_id(p_deh,v)   ((p_deh)->deh_dir_id = cpu_to_le32((v)))
#define put_deh_objectid(p_deh,v) ((p_deh)->deh_objectid = cpu_to_le32((v)))
#define put_deh_location(p_deh,v) ((p_deh)->deh_location = cpu_to_le16((v)))
#define put_deh_state(p_deh,v)    ((p_deh)->deh_state = cpu_to_le16((v)))

/* empty directory contains two entries "." and ".." and their headers */
#define EMPTY_DIR_SIZE \
(DEH_SIZE * 2 + ROUND_UP (sizeof(".") - 1) + ROUND_UP (sizeof("..") - 1))

/* old format directories have this size when empty */
#define EMPTY_DIR_SIZE_V1 (DEH_SIZE * 2 + 3)

#define DEH_Statdata 0		/* not used now */
#define DEH_Visible 2

/* 64 bit systems (and the S/390) need to be aligned explicitly -jdm */
#if BITS_PER_LONG == 64 || defined(__s390__) || defined(__hppa__)
#   define ADDR_UNALIGNED_BITS  (3)
#endif

/*
 * These are only used to manipulate deh_state.
 * Because of this, we'll use the ext2_ bit routines,
 * since they are little endian
 */
#ifdef ADDR_UNALIGNED_BITS

#   define aligned_address(addr)           ((void *)((long)(addr) & ~((1UL << ADDR_UNALIGNED_BITS) - 1)))
#   define unaligned_offset(addr)          (((int)((long)(addr) & ((1 << ADDR_UNALIGNED_BITS) - 1))) << 3)

#   define set_bit_unaligned(nr, addr)	\
	__test_and_set_bit_le((nr) + unaligned_offset(addr), aligned_address(addr))
#   define clear_bit_unaligned(nr, addr)	\
	__test_and_clear_bit_le((nr) + unaligned_offset(addr), aligned_address(addr))
#   define test_bit_unaligned(nr, addr)	\
	test_bit_le((nr) + unaligned_offset(addr), aligned_address(addr))

#else

#   define set_bit_unaligned(nr, addr)	__test_and_set_bit_le(nr, addr)
#   define clear_bit_unaligned(nr, addr)	__test_and_clear_bit_le(nr, addr)
#   define test_bit_unaligned(nr, addr)	test_bit_le(nr, addr)

#endif

#define mark_de_with_sd(deh)        set_bit_unaligned (DEH_Statdata, &((deh)->deh_state))
#define mark_de_without_sd(deh)     clear_bit_unaligned (DEH_Statdata, &((deh)->deh_state))
#define mark_de_visible(deh)	    set_bit_unaligned (DEH_Visible, &((deh)->deh_state))
#define mark_de_hidden(deh)	    clear_bit_unaligned (DEH_Visible, &((deh)->deh_state))

#define de_with_sd(deh)		    test_bit_unaligned (DEH_Statdata, &((deh)->deh_state))
#define de_visible(deh)	    	    test_bit_unaligned (DEH_Visible, &((deh)->deh_state))
#define de_hidden(deh)	    	    !test_bit_unaligned (DEH_Visible, &((deh)->deh_state))

extern void make_empty_dir_item_v1(char *body, __le32 dirid, __le32 objid,
				   __le32 par_dirid, __le32 par_objid);
extern void make_empty_dir_item(char *body, __le32 dirid, __le32 objid,
				__le32 par_dirid, __le32 par_objid);

/* two entries per block (at least) */
#define REISERFS_MAX_NAME(block_size) 255

/*
 * this structure is used for operations on directory entries. It is
 * not a disk structure.
 *
 * When reiserfs_find_entry or search_by_entry_key find directory
 * entry, they return filled reiserfs_dir_entry structure
 */
struct reiserfs_dir_entry {
	struct buffer_head *de_bh;
	int de_item_num;
	struct item_head *de_ih;
	int de_entry_num;
	struct reiserfs_de_head *de_deh;
	int de_entrylen;
	int de_namelen;
	char *de_name;
	unsigned long *de_gen_number_bit_string;

	__u32 de_dir_id;
	__u32 de_objectid;

	struct cpu_key de_entry_key;
};

/*
 * these defines are useful when a particular member of
 * a reiserfs_dir_entry is needed
 */

/* pointer to file name, stored in entry */
#define B_I_DEH_ENTRY_FILE_NAME(bh, ih, deh) \
				(ih_item_body(bh, ih) + deh_location(deh))

/* length of name */
#define I_DEH_N_ENTRY_FILE_NAME_LENGTH(ih,deh,entry_num) \
(I_DEH_N_ENTRY_LENGTH (ih, deh, entry_num) - (de_with_sd (deh) ? SD_SIZE : 0))

/* hash value occupies bits from 7 up to 30 */
#define GET_HASH_VALUE(offset) ((offset) & 0x7fffff80LL)
/* generation number occupies 7 bits starting from 0 up to 6 */
#define GET_GENERATION_NUMBER(offset) ((offset) & 0x7fLL)
#define MAX_GENERATION_NUMBER  127

#define SET_GENERATION_NUMBER(offset,gen_number) (GET_HASH_VALUE(offset)|(gen_number))

/*
 * Picture represents an internal node of the reiserfs tree
 *  ______________________________________________________
 * |      |  Array of     |  Array of         |  Free     |
 * |block |    keys       |  pointers         | space     |
 * | head |      N        |      N+1          |           |
 * |______|_______________|___________________|___________|
 */

/***************************************************************************
 *                      DISK CHILD                                         *
 ***************************************************************************/
/*
 * Disk child pointer:
 * The pointer from an internal node of the tree to a node that is on disk.
 */
struct disk_child {
	__le32 dc_block_number;	/* Disk child's block number. */
	__le16 dc_size;		/* Disk child's used space.   */
	__le16 dc_reserved;
};

#define DC_SIZE (sizeof(struct disk_child))
#define dc_block_number(dc_p)	(le32_to_cpu((dc_p)->dc_block_number))
#define dc_size(dc_p)		(le16_to_cpu((dc_p)->dc_size))
#define put_dc_block_number(dc_p, val)   do { (dc_p)->dc_block_number = cpu_to_le32(val); } while(0)
#define put_dc_size(dc_p, val)   do { (dc_p)->dc_size = cpu_to_le16(val); } while(0)

/* Get disk child by buffer header and position in the tree node. */
#define B_N_CHILD(bh, n_pos)  ((struct disk_child *)\
((bh)->b_data + BLKH_SIZE + B_NR_ITEMS(bh) * KEY_SIZE + DC_SIZE * (n_pos)))

/* Get disk child number by buffer header and position in the tree node. */
#define B_N_CHILD_NUM(bh, n_pos) (dc_block_number(B_N_CHILD(bh, n_pos)))
#define PUT_B_N_CHILD_NUM(bh, n_pos, val) \
				(put_dc_block_number(B_N_CHILD(bh, n_pos), val))

 /* maximal value of field child_size in structure disk_child */
 /* child size is the combined size of all items and their headers */
#define MAX_CHILD_SIZE(bh) ((int)( (bh)->b_size - BLKH_SIZE ))

/* amount of used space in buffer (not including block head) */
#define B_CHILD_SIZE(cur) (MAX_CHILD_SIZE(cur)-(B_FREE_SPACE(cur)))

/* max and min number of keys in internal node */
#define MAX_NR_KEY(bh) ( (MAX_CHILD_SIZE(bh)-DC_SIZE)/(KEY_SIZE+DC_SIZE) )
#define MIN_NR_KEY(bh)    (MAX_NR_KEY(bh)/2)

/***************************************************************************
 *                      PATH STRUCTURES AND DEFINES                        *
 ***************************************************************************/

/*
 * search_by_key fills up the path from the root to the leaf as it descends
 * the tree looking for the key.  It uses reiserfs_bread to try to find
 * buffers in the cache given their block number.  If it does not find
 * them in the cache it reads them from disk.  For each node search_by_key
 * finds using reiserfs_bread it then uses bin_search to look through that
 * node.  bin_search will find the position of the block_number of the next
 * node if it is looking through an internal node.  If it is looking through
 * a leaf node bin_search will find the position of the item which has key
 * either equal to given key, or which is the maximal key less than the
 * given key.
 */

struct path_element {
	/* Pointer to the buffer at the path in the tree. */
	struct buffer_head *pe_buffer;
	/* Position in the tree node which is placed in the buffer above. */
	int pe_position;
};

/*
 * maximal height of a tree. don't change this without
 * changing JOURNAL_PER_BALANCE_CNT
 */
#define MAX_HEIGHT 5

/* Must be equals MAX_HEIGHT + FIRST_PATH_ELEMENT_OFFSET */
#define EXTENDED_MAX_HEIGHT         7

/* Must be equal to at least 2. */
#define FIRST_PATH_ELEMENT_OFFSET   2

/* Must be equal to FIRST_PATH_ELEMENT_OFFSET - 1 */
#define ILLEGAL_PATH_ELEMENT_OFFSET 1

/* this MUST be MAX_HEIGHT + 1. See about FEB below */
#define MAX_FEB_SIZE 6

/*
 * We need to keep track of who the ancestors of nodes are.  When we
 * perform a search we record which nodes were visited while
 * descending the tree looking for the node we searched for. This list
 * of nodes is called the path.  This information is used while
 * performing balancing.  Note that this path information may become
 * invalid, and this means we must check it when using it to see if it
 * is still valid. You'll need to read search_by_key and the comments
 * in it, especially about decrement_counters_in_path(), to understand
 * this structure.
 *
 * Paths make the code so much harder to work with and debug.... An
 * enormous number of bugs are due to them, and trying to write or modify
 * code that uses them just makes my head hurt.  They are based on an
 * excessive effort to avoid disturbing the precious VFS code.:-( The
 * gods only know how we are going to SMP the code that uses them.
 * znodes are the way!
 */

#define PATH_READA	0x1	/* do read ahead */
#define PATH_READA_BACK 0x2	/* read backwards */

struct treepath {
	int path_length;	/* Length of the array above.   */
	int reada;
	/* Array of the path elements.  */
	struct path_element path_elements[EXTENDED_MAX_HEIGHT];
	int pos_in_item;
};

#define pos_in_item(path) ((path)->pos_in_item)

#define INITIALIZE_PATH(var) \
struct treepath var = {.path_length = ILLEGAL_PATH_ELEMENT_OFFSET, .reada = 0,}

/* Get path element by path and path position. */
#define PATH_OFFSET_PELEMENT(path, n_offset)  ((path)->path_elements + (n_offset))

/* Get buffer header at the path by path and path position. */
#define PATH_OFFSET_PBUFFER(path, n_offset)   (PATH_OFFSET_PELEMENT(path, n_offset)->pe_buffer)

/* Get position in the element at the path by path and path position. */
#define PATH_OFFSET_POSITION(path, n_offset) (PATH_OFFSET_PELEMENT(path, n_offset)->pe_position)

#define PATH_PLAST_BUFFER(path) (PATH_OFFSET_PBUFFER((path), (path)->path_length))

/*
 * you know, to the person who didn't write this the macro name does not
 * at first suggest what it does.  Maybe POSITION_FROM_PATH_END? Or
 * maybe we should just focus on dumping paths... -Hans
 */
#define PATH_LAST_POSITION(path) (PATH_OFFSET_POSITION((path), (path)->path_length))

/*
 * in do_balance leaf has h == 0 in contrast with path structure,
 * where root has level == 0. That is why we need these defines
 */

/* tb->S[h] */
#define PATH_H_PBUFFER(path, h) \
			PATH_OFFSET_PBUFFER(path, path->path_length - (h))

/* tb->F[h] or tb->S[0]->b_parent */
#define PATH_H_PPARENT(path, h) PATH_H_PBUFFER(path, (h) + 1)

#define PATH_H_POSITION(path, h) \
			PATH_OFFSET_POSITION(path, path->path_length - (h))

/* tb->S[h]->b_item_order */
#define PATH_H_B_ITEM_ORDER(path, h) PATH_H_POSITION(path, h + 1)

#define PATH_H_PATH_OFFSET(path, n_h) ((path)->path_length - (n_h))

static inline void *reiserfs_node_data(const struct buffer_head *bh)
{
	return bh->b_data + sizeof(struct block_head);
}

/* get key from internal node */
static inline struct reiserfs_key *internal_key(struct buffer_head *bh,
						int item_num)
{
	struct reiserfs_key *key = reiserfs_node_data(bh);

	return &key[item_num];
}

/* get the item header from leaf node */
static inline struct item_head *item_head(const struct buffer_head *bh,
					  int item_num)
{
	struct item_head *ih = reiserfs_node_data(bh);

	return &ih[item_num];
}

/* get the key from leaf node */
static inline struct reiserfs_key *leaf_key(const struct buffer_head *bh,
					    int item_num)
{
	return &item_head(bh, item_num)->ih_key;
}

static inline void *ih_item_body(const struct buffer_head *bh,
				 const struct item_head *ih)
{
	return bh->b_data + ih_location(ih);
}

/* get item body from leaf node */
static inline void *item_body(const struct buffer_head *bh, int item_num)
{
	return ih_item_body(bh, item_head(bh, item_num));
}

static inline struct item_head *tp_item_head(const struct treepath *path)
{
	return item_head(PATH_PLAST_BUFFER(path), PATH_LAST_POSITION(path));
}

static inline void *tp_item_body(const struct treepath *path)
{
	return item_body(PATH_PLAST_BUFFER(path), PATH_LAST_POSITION(path));
}

#define get_last_bh(path) PATH_PLAST_BUFFER(path)
#define get_item_pos(path) PATH_LAST_POSITION(path)
#define item_moved(ih,path) comp_items(ih, path)
#define path_changed(ih,path) comp_items (ih, path)

/* array of the entry headers */
 /* get item body */
#define B_I_DEH(bh, ih) ((struct reiserfs_de_head *)(ih_item_body(bh, ih)))

/*
 * length of the directory entry in directory item. This define
 * calculates length of i-th directory entry using directory entry
 * locations from dir entry head. When it calculates length of 0-th
 * directory entry, it uses length of whole item in place of entry
 * location of the non-existent following entry in the calculation.
 * See picture above.
 */
static inline int entry_length(const struct buffer_head *bh,
			       const struct item_head *ih, int pos_in_item)
{
	struct reiserfs_de_head *deh;

	deh = B_I_DEH(bh, ih) + pos_in_item;
	if (pos_in_item)
		return deh_location(deh - 1) - deh_location(deh);

	return ih_item_len(ih) - deh_location(deh);
}

/***************************************************************************
 *                       MISC                                              *
 ***************************************************************************/

/* Size of pointer to the unformatted node. */
#define UNFM_P_SIZE (sizeof(unp_t))
#define UNFM_P_SHIFT 2

/* in in-core inode key is stored on le form */
#define INODE_PKEY(inode) ((struct reiserfs_key *)(REISERFS_I(inode)->i_key))

#define MAX_UL_INT 0xffffffff
#define MAX_INT    0x7ffffff
#define MAX_US_INT 0xffff

// reiserfs version 2 has max offset 60 bits. Version 1 - 32 bit offset
static inline loff_t max_reiserfs_offset(struct inode *inode)
{
	if (get_inode_item_key_version(inode) == KEY_FORMAT_3_5)
		return (loff_t) U32_MAX;

	return (loff_t) ((~(__u64) 0) >> 4);
}

#define MAX_KEY_OBJECTID	MAX_UL_INT

#define MAX_B_NUM  MAX_UL_INT
#define MAX_FC_NUM MAX_US_INT

/* the purpose is to detect overflow of an unsigned short */
#define REISERFS_LINK_MAX (MAX_US_INT - 1000)

/*
 * The following defines are used in reiserfs_insert_item
 * and reiserfs_append_item
 */
#define REISERFS_KERNEL_MEM		0	/* kernel memory mode */
#define REISERFS_USER_MEM		1	/* user memory mode */

#define fs_generation(s) (REISERFS_SB(s)->s_generation_counter)
#define get_generation(s) atomic_read (&fs_generation(s))
#define FILESYSTEM_CHANGED_TB(tb)  (get_generation((tb)->tb_sb) != (tb)->fs_gen)
#define __fs_changed(gen,s) (gen != get_generation (s))
#define fs_changed(gen,s)		\
({					\
	reiserfs_cond_resched(s);	\
	__fs_changed(gen, s);		\
})

/***************************************************************************
 *                  FIXATE NODES                                           *
 ***************************************************************************/

#define VI_TYPE_LEFT_MERGEABLE 1
#define VI_TYPE_RIGHT_MERGEABLE 2

/*
 * To make any changes in the tree we always first find node, that
 * contains item to be changed/deleted or place to insert a new
 * item. We call this node S. To do balancing we need to decide what
 * we will shift to left/right neighbor, or to a new node, where new
 * item will be etc. To make this analysis simpler we build virtual
 * node. Virtual node is an array of items, that will replace items of
 * node S. (For instance if we are going to delete an item, virtual
 * node does not contain it). Virtual node keeps information about
 * item sizes and types, mergeability of first and last items, sizes
 * of all entries in directory item. We use this array of items when
 * calculating what we can shift to neighbors and how many nodes we
 * have to have if we do not any shiftings, if we shift to left/right
 * neighbor or to both.
 */
struct virtual_item {
	int vi_index;		/* index in the array of item operations */
	unsigned short vi_type;	/* left/right mergeability */

	/* length of item that it will have after balancing */
	unsigned short vi_item_len;

	struct item_head *vi_ih;
	const char *vi_item;	/* body of item (old or new) */
	const void *vi_new_data;	/* 0 always but paste mode */
	void *vi_uarea;		/* item specific area */
};

struct virtual_node {
	/* this is a pointer to the free space in the buffer */
	char *vn_free_ptr;

	unsigned short vn_nr_item;	/* number of items in virtual node */

	/*
	 * size of node , that node would have if it has
	 * unlimited size and no balancing is performed
	 */
	short vn_size;

	/* mode of balancing (paste, insert, delete, cut) */
	short vn_mode;

	short vn_affected_item_num;
	short vn_pos_in_item;

	/* item header of inserted item, 0 for other modes */
	struct item_head *vn_ins_ih;
	const void *vn_data;

	/* array of items (including a new one, excluding item to be deleted) */
	struct virtual_item *vn_vi;
};

/* used by directory items when creating virtual nodes */
struct direntry_uarea {
	int flags;
	__u16 entry_count;
	__u16 entry_sizes[1];
} __attribute__ ((__packed__));

/***************************************************************************
 *                  TREE BALANCE                                           *
 ***************************************************************************/

/*
 * This temporary structure is used in tree balance algorithms, and
 * constructed as we go to the extent that its various parts are
 * needed.  It contains arrays of nodes that can potentially be
 * involved in the balancing of node S, and parameters that define how
 * each of the nodes must be balanced.  Note that in these algorithms
 * for balancing the worst case is to need to balance the current node
 * S and the left and right neighbors and all of their parents plus
 * create a new node.  We implement S1 balancing for the leaf nodes
 * and S0 balancing for the internal nodes (S1 and S0 are defined in
 * our papers.)
 */

/* size of the array of buffers to free at end of do_balance */
#define MAX_FREE_BLOCK 7

/* maximum number of FEB blocknrs on a single level */
#define MAX_AMOUNT_NEEDED 2

/* someday somebody will prefix every field in this struct with tb_ */
struct tree_balance {
	int tb_mode;
	int need_balance_dirty;
	struct super_block *tb_sb;
	struct reiserfs_transaction_handle *transaction_handle;
	struct treepath *tb_path;

	/* array of left neighbors of nodes in the path */
	struct buffer_head *L[MAX_HEIGHT];

	/* array of right neighbors of nodes in the path */
	struct buffer_head *R[MAX_HEIGHT];

	/* array of fathers of the left neighbors */
	struct buffer_head *FL[MAX_HEIGHT];

	/* array of fathers of the right neighbors */
	struct buffer_head *FR[MAX_HEIGHT];
	/* array of common parents of center node and its left neighbor */
	struct buffer_head *CFL[MAX_HEIGHT];

	/* array of common parents of center node and its right neighbor */
	struct buffer_head *CFR[MAX_HEIGHT];

	/*
	 * array of empty buffers. Number of buffers in array equals
	 * cur_blknum.
	 */
	struct buffer_head *FEB[MAX_FEB_SIZE];
	struct buffer_head *used[MAX_FEB_SIZE];
	struct buffer_head *thrown[MAX_FEB_SIZE];

	/*
	 * array of number of items which must be shifted to the left in
	 * order to balance the current node; for leaves includes item that
	 * will be partially shifted; for internal nodes, it is the number
	 * of child pointers rather than items. It includes the new item
	 * being created. The code sometimes subtracts one to get the
	 * number of wholly shifted items for other purposes.
	 */
	int lnum[MAX_HEIGHT];

	/* substitute right for left in comment above */
	int rnum[MAX_HEIGHT];

	/*
	 * array indexed by height h mapping the key delimiting L[h] and
	 * S[h] to its item number within the node CFL[h]
	 */
	int lkey[MAX_HEIGHT];

	/* substitute r for l in comment above */
	int rkey[MAX_HEIGHT];

	/*
	 * the number of bytes by we are trying to add or remove from
	 * S[h]. A negative value means removing.
	 */
	int insert_size[MAX_HEIGHT];

	/*
	 * number of nodes that will replace node S[h] after balancing
	 * on the level h of the tree.  If 0 then S is being deleted,
	 * if 1 then S is remaining and no new nodes are being created,
	 * if 2 or 3 then 1 or 2 new nodes is being created
	 */
	int blknum[MAX_HEIGHT];

	/* fields that are used only for balancing leaves of the tree */

	/* number of empty blocks having been already allocated */
	int cur_blknum;

	/* number of items that fall into left most node when S[0] splits */
	int s0num;

	/*
	 * number of bytes which can flow to the left neighbor from the left
	 * most liquid item that cannot be shifted from S[0] entirely
	 * if -1 then nothing will be partially shifted
	 */
	int lbytes;

	/*
	 * number of bytes which will flow to the right neighbor from the right
	 * most liquid item that cannot be shifted from S[0] entirely
	 * if -1 then nothing will be partially shifted
	 */
	int rbytes;


	/*
	 * index into the array of item headers in
	 * S[0] of the affected item
	 */
	int item_pos;

	/* new nodes allocated to hold what could not fit into S */
	struct buffer_head *S_new[2];

	/*
	 * number of items that will be placed into nodes in S_new
	 * when S[0] splits
	 */
	int snum[2];

	/*
	 * number of bytes which flow to nodes in S_new when S[0] splits
	 * note: if S[0] splits into 3 nodes, then items do not need to be cut
	 */
	int sbytes[2];

	int pos_in_item;
	int zeroes_num;

	/*
	 * buffers which are to be freed after do_balance finishes
	 * by unfix_nodes
	 */
	struct buffer_head *buf_to_free[MAX_FREE_BLOCK];

	/*
	 * kmalloced memory. Used to create virtual node and keep
	 * map of dirtied bitmap blocks
	 */
	char *vn_buf;

	int vn_buf_size;	/* size of the vn_buf */

	/* VN starts after bitmap of bitmap blocks */
	struct virtual_node *tb_vn;

	/*
	 * saved value of `reiserfs_generation' counter see
	 * FILESYSTEM_CHANGED() macro in reiserfs_fs.h
	 */
	int fs_gen;

#ifdef DISPLACE_NEW_PACKING_LOCALITIES
	/*
	 * key pointer, to pass to block allocator or
	 * another low-level subsystem
	 */
	struct in_core_key key;
#endif
};

/* These are modes of balancing */

/* When inserting an item. */
#define M_INSERT	'i'
/*
 * When inserting into (directories only) or appending onto an already
 * existent item.
 */
#define M_PASTE		'p'
/* When deleting an item. */
#define M_DELETE	'd'
/* When truncating an item or removing an entry from a (directory) item. */
#define M_CUT		'c'

/* used when balancing on leaf level skipped (in reiserfsck) */
#define M_INTERNAL	'n'

/*
 * When further balancing is not needed, then do_balance does not need
 * to be called.
 */
#define M_SKIP_BALANCING		's'
#define M_CONVERT	'v'

/* modes of leaf_move_items */
#define LEAF_FROM_S_TO_L 0
#define LEAF_FROM_S_TO_R 1
#define LEAF_FROM_R_TO_L 2
#define LEAF_FROM_L_TO_R 3
#define LEAF_FROM_S_TO_SNEW 4

#define FIRST_TO_LAST 0
#define LAST_TO_FIRST 1

/*
 * used in do_balance for passing parent of node information that has
 * been gotten from tb struct
 */
struct buffer_info {
	struct tree_balance *tb;
	struct buffer_head *bi_bh;
	struct buffer_head *bi_parent;
	int bi_position;
};

static inline struct super_block *sb_from_tb(struct tree_balance *tb)
{
	return tb ? tb->tb_sb : NULL;
}

static inline struct super_block *sb_from_bi(struct buffer_info *bi)
{
	return bi ? sb_from_tb(bi->tb) : NULL;
}

/*
 * there are 4 types of items: stat data, directory item, indirect, direct.
 * +-------------------+------------+--------------+------------+
 * |                   |  k_offset  | k_uniqueness | mergeable? |
 * +-------------------+------------+--------------+------------+
 * |     stat data     |     0      |      0       |   no       |
 * +-------------------+------------+--------------+------------+
 * | 1st directory item| DOT_OFFSET | DIRENTRY_ .. |   no       |
 * | non 1st directory | hash value | UNIQUENESS   |   yes      |
 * |     item          |            |              |            |
 * +-------------------+------------+--------------+------------+
 * | indirect item     | offset + 1 |TYPE_INDIRECT |    [1]	|
 * +-------------------+------------+--------------+------------+
 * | direct item       | offset + 1 |TYPE_DIRECT   |    [2]     |
 * +-------------------+------------+--------------+------------+
 *
 * [1] if this is not the first indirect item of the object
 * [2] if this is not the first direct item of the object
*/

struct item_operations {
	int (*bytes_number) (struct item_head * ih, int block_size);
	void (*decrement_key) (struct cpu_key *);
	int (*is_left_mergeable) (struct reiserfs_key * ih,
				  unsigned long bsize);
	void (*print_item) (struct item_head *, char *item);
	void (*check_item) (struct item_head *, char *item);

	int (*create_vi) (struct virtual_node * vn, struct virtual_item * vi,
			  int is_affected, int insert_size);
	int (*check_left) (struct virtual_item * vi, int free,
			   int start_skip, int end_skip);
	int (*check_right) (struct virtual_item * vi, int free);
	int (*part_size) (struct virtual_item * vi, int from, int to);
	int (*unit_num) (struct virtual_item * vi);
	void (*print_vi) (struct virtual_item * vi);
};

extern struct item_operations *item_ops[TYPE_ANY + 1];

#define op_bytes_number(ih,bsize)                    item_ops[le_ih_k_type (ih)]->bytes_number (ih, bsize)
#define op_is_left_mergeable(key,bsize)              item_ops[le_key_k_type (le_key_version (key), key)]->is_left_mergeable (key, bsize)
#define op_print_item(ih,item)                       item_ops[le_ih_k_type (ih)]->print_item (ih, item)
#define op_check_item(ih,item)                       item_ops[le_ih_k_type (ih)]->check_item (ih, item)
#define op_create_vi(vn,vi,is_affected,insert_size)  item_ops[le_ih_k_type ((vi)->vi_ih)]->create_vi (vn,vi,is_affected,insert_size)
#define op_check_left(vi,free,start_skip,end_skip) item_ops[(vi)->vi_index]->check_left (vi, free, start_skip, end_skip)
#define op_check_right(vi,free)                      item_ops[(vi)->vi_index]->check_right (vi, free)
#define op_part_size(vi,from,to)                     item_ops[(vi)->vi_index]->part_size (vi, from, to)
#define op_unit_num(vi)				     item_ops[(vi)->vi_index]->unit_num (vi)
#define op_print_vi(vi)                              item_ops[(vi)->vi_index]->print_vi (vi)

#define COMP_SHORT_KEYS comp_short_keys

/* number of blocks pointed to by the indirect item */
#define I_UNFM_NUM(ih)	(ih_item_len(ih) / UNFM_P_SIZE)

/*
 * the used space within the unformatted node corresponding
 * to pos within the item pointed to by ih
 */
#define I_POS_UNFM_SIZE(ih,pos,size) (((pos) == I_UNFM_NUM(ih) - 1 ) ? (size) - ih_free_space(ih) : (size))

/*
 * number of bytes contained by the direct item or the
 * unformatted nodes the indirect item points to
 */

/* following defines use reiserfs buffer header and item header */

/* get stat-data */
#define B_I_STAT_DATA(bh, ih) ( (struct stat_data * )((bh)->b_data + ih_location(ih)) )

/* this is 3976 for size==4096 */
#define MAX_DIRECT_ITEM_LEN(size) ((size) - BLKH_SIZE - 2*IH_SIZE - SD_SIZE - UNFM_P_SIZE)

/*
 * indirect items consist of entries which contain blocknrs, pos
 * indicates which entry, and B_I_POS_UNFM_POINTER resolves to the
 * blocknr contained by the entry pos points to
 */
#define B_I_POS_UNFM_POINTER(bh, ih, pos)				\
	le32_to_cpu(*(((unp_t *)ih_item_body(bh, ih)) + (pos)))
#define PUT_B_I_POS_UNFM_POINTER(bh, ih, pos, val)			\
	(*(((unp_t *)ih_item_body(bh, ih)) + (pos)) = cpu_to_le32(val))

struct reiserfs_iget_args {
	__u32 objectid;
	__u32 dirid;
};

/***************************************************************************
 *                    FUNCTION DECLARATIONS                                *
 ***************************************************************************/

#define get_journal_desc_magic(bh) (bh->b_data + bh->b_size - 12)

#define journal_trans_half(blocksize) \
	((blocksize - sizeof (struct reiserfs_journal_desc) + sizeof (__u32) - 12) / sizeof (__u32))

/* journal.c see journal.c for all the comments here */

/* first block written in a commit.  */
struct reiserfs_journal_desc {
	__le32 j_trans_id;	/* id of commit */

	/* length of commit. len +1 is the commit block */
	__le32 j_len;

	__le32 j_mount_id;	/* mount id of this trans */
	__le32 j_realblock[1];	/* real locations for each block */
};

#define get_desc_trans_id(d)   le32_to_cpu((d)->j_trans_id)
#define get_desc_trans_len(d)  le32_to_cpu((d)->j_len)
#define get_desc_mount_id(d)   le32_to_cpu((d)->j_mount_id)

#define set_desc_trans_id(d,val)       do { (d)->j_trans_id = cpu_to_le32 (val); } while (0)
#define set_desc_trans_len(d,val)      do { (d)->j_len = cpu_to_le32 (val); } while (0)
#define set_desc_mount_id(d,val)       do { (d)->j_mount_id = cpu_to_le32 (val); } while (0)

/* last block written in a commit */
struct reiserfs_journal_commit {
	__le32 j_trans_id;	/* must match j_trans_id from the desc block */
	__le32 j_len;		/* ditto */
	__le32 j_realblock[1];	/* real locations for each block */
};

#define get_commit_trans_id(c) le32_to_cpu((c)->j_trans_id)
#define get_commit_trans_len(c)        le32_to_cpu((c)->j_len)
#define get_commit_mount_id(c) le32_to_cpu((c)->j_mount_id)

#define set_commit_trans_id(c,val)     do { (c)->j_trans_id = cpu_to_le32 (val); } while (0)
#define set_commit_trans_len(c,val)    do { (c)->j_len = cpu_to_le32 (val); } while (0)

/*
 * this header block gets written whenever a transaction is considered
 * fully flushed, and is more recent than the last fully flushed transaction.
 * fully flushed means all the log blocks and all the real blocks are on
 * disk, and this transaction does not need to be replayed.
 */
struct reiserfs_journal_header {
	/* id of last fully flushed transaction */
	__le32 j_last_flush_trans_id;

	/* offset in the log of where to start replay after a crash */
	__le32 j_first_unflushed_offset;

	__le32 j_mount_id;
	/* 12 */ struct journal_params jh_journal;
};

/* biggest tunable defines are right here */
#define JOURNAL_BLOCK_COUNT 8192	/* number of blocks in the journal */

/* biggest possible single transaction, don't change for now (8/3/99) */
#define JOURNAL_TRANS_MAX_DEFAULT 1024
#define JOURNAL_TRANS_MIN_DEFAULT 256

/*
 * max blocks to batch into one transaction,
 * don't make this any bigger than 900
 */
#define JOURNAL_MAX_BATCH_DEFAULT   900
#define JOURNAL_MIN_RATIO 2
#define JOURNAL_MAX_COMMIT_AGE 30
#define JOURNAL_MAX_TRANS_AGE 30
#define JOURNAL_PER_BALANCE_CNT (3 * (MAX_HEIGHT-2) + 9)
#define JOURNAL_BLOCKS_PER_OBJECT(sb)  (JOURNAL_PER_BALANCE_CNT * 3 + \
					 2 * (REISERFS_QUOTA_INIT_BLOCKS(sb) + \
					      REISERFS_QUOTA_TRANS_BLOCKS(sb)))

#ifdef CONFIG_QUOTA
#define REISERFS_QUOTA_OPTS ((1 << REISERFS_USRQUOTA) | (1 << REISERFS_GRPQUOTA))
/* We need to update data and inode (atime) */
#define REISERFS_QUOTA_TRANS_BLOCKS(s) (REISERFS_SB(s)->s_mount_opt & REISERFS_QUOTA_OPTS ? 2 : 0)
/* 1 balancing, 1 bitmap, 1 data per write + stat data update */
#define REISERFS_QUOTA_INIT_BLOCKS(s) (REISERFS_SB(s)->s_mount_opt & REISERFS_QUOTA_OPTS ? \
(DQUOT_INIT_ALLOC*(JOURNAL_PER_BALANCE_CNT+2)+DQUOT_INIT_REWRITE+1) : 0)
/* same as with INIT */
#define REISERFS_QUOTA_DEL_BLOCKS(s) (REISERFS_SB(s)->s_mount_opt & REISERFS_QUOTA_OPTS ? \
(DQUOT_DEL_ALLOC*(JOURNAL_PER_BALANCE_CNT+2)+DQUOT_DEL_REWRITE+1) : 0)
#else
#define REISERFS_QUOTA_TRANS_BLOCKS(s) 0
#define REISERFS_QUOTA_INIT_BLOCKS(s) 0
#define REISERFS_QUOTA_DEL_BLOCKS(s) 0
#endif

/*
 * both of these can be as low as 1, or as high as you want.  The min is the
 * number of 4k bitmap nodes preallocated on mount. New nodes are allocated
 * as needed, and released when transactions are committed.  On release, if
 * the current number of nodes is > max, the node is freed, otherwise,
 * it is put on a free list for faster use later.
*/
#define REISERFS_MIN_BITMAP_NODES 10
#define REISERFS_MAX_BITMAP_NODES 100

/* these are based on journal hash size of 8192 */
#define JBH_HASH_SHIFT 13
#define JBH_HASH_MASK 8191

#define _jhashfn(sb,block)	\
	(((unsigned long)sb>>L1_CACHE_SHIFT) ^ \
	 (((block)<<(JBH_HASH_SHIFT - 6)) ^ ((block) >> 13) ^ ((block) << (JBH_HASH_SHIFT - 12))))
#define journal_hash(t,sb,block) ((t)[_jhashfn((sb),(block)) & JBH_HASH_MASK])

/* We need these to make journal.c code more readable */
#define journal_find_get_block(s, block) __find_get_block(SB_JOURNAL(s)->j_dev_bd, block, s->s_blocksize)
#define journal_getblk(s, block) __getblk(SB_JOURNAL(s)->j_dev_bd, block, s->s_blocksize)
#define journal_bread(s, block) __bread(SB_JOURNAL(s)->j_dev_bd, block, s->s_blocksize)

enum reiserfs_bh_state_bits {
	BH_JDirty = BH_PrivateStart,	/* buffer is in current transaction */
	BH_JDirty_wait,
	/*
	 * disk block was taken off free list before being in a
	 * finished transaction, or written to disk. Can be reused immed.
	 */
	BH_JNew,
	BH_JPrepared,
	BH_JRestore_dirty,
	BH_JTest,		/* debugging only will go away */
};

BUFFER_FNS(JDirty, journaled);
TAS_BUFFER_FNS(JDirty, journaled);
BUFFER_FNS(JDirty_wait, journal_dirty);
TAS_BUFFER_FNS(JDirty_wait, journal_dirty);
BUFFER_FNS(JNew, journal_new);
TAS_BUFFER_FNS(JNew, journal_new);
BUFFER_FNS(JPrepared, journal_prepared);
TAS_BUFFER_FNS(JPrepared, journal_prepared);
BUFFER_FNS(JRestore_dirty, journal_restore_dirty);
TAS_BUFFER_FNS(JRestore_dirty, journal_restore_dirty);
BUFFER_FNS(JTest, journal_test);
TAS_BUFFER_FNS(JTest, journal_test);

/* transaction handle which is passed around for all journal calls */
struct reiserfs_transaction_handle {
	/*
	 * super for this FS when journal_begin was called. saves calls to
	 * reiserfs_get_super also used by nested transactions to make
	 * sure they are nesting on the right FS _must_ be first
	 * in the handle
	 */
	struct super_block *t_super;

	int t_refcount;
	int t_blocks_logged;	/* number of blocks this writer has logged */
	int t_blocks_allocated;	/* number of blocks this writer allocated */

	/* sanity check, equals the current trans id */
	unsigned int t_trans_id;

	void *t_handle_save;	/* save existing current->journal_info */

	/*
	 * if new block allocation occurres, that block
	 * should be displaced from others
	 */
	unsigned displace_new_blocks:1;

	struct list_head t_list;
};

/*
 * used to keep track of ordered and tail writes, attached to the buffer
 * head through b_journal_head.
 */
struct reiserfs_jh {
	struct reiserfs_journal_list *jl;
	struct buffer_head *bh;
	struct list_head list;
};

void reiserfs_free_jh(struct buffer_head *bh);
int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh);
int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh);
int journal_mark_dirty(struct reiserfs_transaction_handle *,
		       struct buffer_head *bh);

static inline int reiserfs_file_data_log(struct inode *inode)
{
	if (reiserfs_data_log(inode->i_sb) ||
	    (REISERFS_I(inode)->i_flags & i_data_log))
		return 1;
	return 0;
}

static inline int reiserfs_transaction_running(struct super_block *s)
{
	struct reiserfs_transaction_handle *th = current->journal_info;
	if (th && th->t_super == s)
		return 1;
	if (th && th->t_super == NULL)
		BUG();
	return 0;
}

static inline int reiserfs_transaction_free_space(struct reiserfs_transaction_handle *th)
{
	return th->t_blocks_allocated - th->t_blocks_logged;
}

struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
								    super_block
								    *,
								    int count);
int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *);
void reiserfs_vfs_truncate_file(struct inode *inode);
int reiserfs_commit_page(struct inode *inode, struct page *page,
			 unsigned from, unsigned to);
void reiserfs_flush_old_commits(struct super_block *);
int reiserfs_commit_for_inode(struct inode *);
int reiserfs_inode_needs_commit(struct inode *);
void reiserfs_update_inode_transaction(struct inode *);
void reiserfs_wait_on_write_block(struct super_block *s);
void reiserfs_block_writes(struct reiserfs_transaction_handle *th);
void reiserfs_allow_writes(struct super_block *s);
void reiserfs_check_lock_depth(struct super_block *s, char *caller);
int reiserfs_prepare_for_journal(struct super_block *, struct buffer_head *bh,
				 int wait);
void reiserfs_restore_prepared_buffer(struct super_block *,
				      struct buffer_head *bh);
int journal_init(struct super_block *, const char *j_dev_name, int old_format,
		 unsigned int);
int journal_release(struct reiserfs_transaction_handle *, struct super_block *);
int journal_release_error(struct reiserfs_transaction_handle *,
			  struct super_block *);
int journal_end(struct reiserfs_transaction_handle *);
int journal_end_sync(struct reiserfs_transaction_handle *);
int journal_mark_freed(struct reiserfs_transaction_handle *,
		       struct super_block *, b_blocknr_t blocknr);
int journal_transaction_should_end(struct reiserfs_transaction_handle *, int);
int reiserfs_in_journal(struct super_block *sb, unsigned int bmap_nr,
			 int bit_nr, int searchall, b_blocknr_t *next);
int journal_begin(struct reiserfs_transaction_handle *,
		  struct super_block *sb, unsigned long);
int journal_join_abort(struct reiserfs_transaction_handle *,
		       struct super_block *sb);
void reiserfs_abort_journal(struct super_block *sb, int errno);
void reiserfs_abort(struct super_block *sb, int errno, const char *fmt, ...);
int reiserfs_allocate_list_bitmaps(struct super_block *s,
				   struct reiserfs_list_bitmap *, unsigned int);

void reiserfs_schedule_old_flush(struct super_block *s);
void reiserfs_cancel_old_flush(struct super_block *s);
void add_save_link(struct reiserfs_transaction_handle *th,
		   struct inode *inode, int truncate);
int remove_save_link(struct inode *inode, int truncate);

/* objectid.c */
__u32 reiserfs_get_unused_objectid(struct reiserfs_transaction_handle *th);
void reiserfs_release_objectid(struct reiserfs_transaction_handle *th,
			       __u32 objectid_to_release);
int reiserfs_convert_objectid_map_v1(struct super_block *);

/* stree.c */
int B_IS_IN_TREE(const struct buffer_head *);
extern void copy_item_head(struct item_head *to,
			   const struct item_head *from);

/* first key is in cpu form, second - le */
extern int comp_short_keys(const struct reiserfs_key *le_key,
			   const struct cpu_key *cpu_key);
extern void le_key2cpu_key(struct cpu_key *to, const struct reiserfs_key *from);

/* both are in le form */
extern int comp_le_keys(const struct reiserfs_key *,
			const struct reiserfs_key *);
extern int comp_short_le_keys(const struct reiserfs_key *,
			      const struct reiserfs_key *);

/* * get key version from on disk key - kludge */
static inline int le_key_version(const struct reiserfs_key *key)
{
	int type;

	type = offset_v2_k_type(&(key->u.k_offset_v2));
	if (type != TYPE_DIRECT && type != TYPE_INDIRECT
	    && type != TYPE_DIRENTRY)
		return KEY_FORMAT_3_5;

	return KEY_FORMAT_3_6;

}

static inline void copy_key(struct reiserfs_key *to,
			    const struct reiserfs_key *from)
{
	memcpy(to, from, KEY_SIZE);
}

int comp_items(const struct item_head *stored_ih, const struct treepath *path);
const struct reiserfs_key *get_rkey(const struct treepath *chk_path,
				    const struct super_block *sb);
int search_by_key(struct super_block *, const struct cpu_key *,
		  struct treepath *, int);
#define search_item(s,key,path) search_by_key (s, key, path, DISK_LEAF_NODE_LEVEL)
int search_for_position_by_key(struct super_block *sb,
			       const struct cpu_key *cpu_key,
			       struct treepath *search_path);
extern void decrement_bcount(struct buffer_head *bh);
void decrement_counters_in_path(struct treepath *search_path);
void pathrelse(struct treepath *search_path);
int reiserfs_check_path(struct treepath *p);
void pathrelse_and_restore(struct super_block *s, struct treepath *search_path);

int reiserfs_insert_item(struct reiserfs_transaction_handle *th,
			 struct treepath *path,
			 const struct cpu_key *key,
			 struct item_head *ih,
			 struct inode *inode, const char *body);

int reiserfs_paste_into_item(struct reiserfs_transaction_handle *th,
			     struct treepath *path,
			     const struct cpu_key *key,
			     struct inode *inode,
			     const char *body, int paste_size);

int reiserfs_cut_from_item(struct reiserfs_transaction_handle *th,
			   struct treepath *path,
			   struct cpu_key *key,
			   struct inode *inode,
			   struct page *page, loff_t new_file_size);

int reiserfs_delete_item(struct reiserfs_transaction_handle *th,
			 struct treepath *path,
			 const struct cpu_key *key,
			 struct inode *inode, struct buffer_head *un_bh);

void reiserfs_delete_solid_item(struct reiserfs_transaction_handle *th,
				struct inode *inode, struct reiserfs_key *key);
int reiserfs_delete_object(struct reiserfs_transaction_handle *th,
			   struct inode *inode);
int reiserfs_do_truncate(struct reiserfs_transaction_handle *th,
			 struct inode *inode, struct page *,
			 int update_timestamps);

#define i_block_size(inode) ((inode)->i_sb->s_blocksize)
#define file_size(inode) ((inode)->i_size)
#define tail_size(inode) (file_size (inode) & (i_block_size (inode) - 1))

#define tail_has_to_be_packed(inode) (have_large_tails ((inode)->i_sb)?\
!STORE_TAIL_IN_UNFM_S1(file_size (inode), tail_size(inode), inode->i_sb->s_blocksize):have_small_tails ((inode)->i_sb)?!STORE_TAIL_IN_UNFM_S2(file_size (inode), tail_size(inode), inode->i_sb->s_blocksize):0 )

void padd_item(char *item, int total_length, int length);

/* inode.c */
/* args for the create parameter of reiserfs_get_block */
#define GET_BLOCK_NO_CREATE 0	 /* don't create new blocks or convert tails */
#define GET_BLOCK_CREATE 1	 /* add anything you need to find block */
#define GET_BLOCK_NO_HOLE 2	 /* return -ENOENT for file holes */
#define GET_BLOCK_READ_DIRECT 4	 /* read the tail if indirect item not found */
#define GET_BLOCK_NO_IMUX     8	 /* i_mutex is not held, don't preallocate */
#define GET_BLOCK_NO_DANGLE   16 /* don't leave any transactions running */

void reiserfs_read_locked_inode(struct inode *inode,
				struct reiserfs_iget_args *args);
int reiserfs_find_actor(struct inode *inode, void *p);
int reiserfs_init_locked_inode(struct inode *inode, void *p);
void reiserfs_evict_inode(struct inode *inode);
int reiserfs_write_inode(struct inode *inode, struct writeback_control *wbc);
int reiserfs_get_block(struct inode *inode, sector_t block,
		       struct buffer_head *bh_result, int create);
struct dentry *reiserfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
				     int fh_len, int fh_type);
struct dentry *reiserfs_fh_to_parent(struct super_block *sb, struct fid *fid,
				     int fh_len, int fh_type);
int reiserfs_encode_fh(struct inode *inode, __u32 * data, int *lenp,
		       struct inode *parent);

int reiserfs_truncate_file(struct inode *, int update_timestamps);
void make_cpu_key(struct cpu_key *cpu_key, struct inode *inode, loff_t offset,
		  int type, int key_length);
void make_le_item_head(struct item_head *ih, const struct cpu_key *key,
		       int version,
		       loff_t offset, int type, int length, int entry_count);
struct inode *reiserfs_iget(struct super_block *s, const struct cpu_key *key);

struct reiserfs_security_handle;
int reiserfs_new_inode(struct reiserfs_transaction_handle *th,
		       struct inode *dir, umode_t mode,
		       const char *symname, loff_t i_size,
		       struct dentry *dentry, struct inode *inode,
		       struct reiserfs_security_handle *security);

void reiserfs_update_sd_size(struct reiserfs_transaction_handle *th,
			     struct inode *inode, loff_t size);

static inline void reiserfs_update_sd(struct reiserfs_transaction_handle *th,
				      struct inode *inode)
{
	reiserfs_update_sd_size(th, inode, inode->i_size);
}

void sd_attrs_to_i_attrs(__u16 sd_attrs, struct inode *inode);
int reiserfs_setattr(struct dentry *dentry, struct iattr *attr);

int __reiserfs_write_begin(struct page *page, unsigned from, unsigned len);

/* namei.c */
void set_de_name_and_namelen(struct reiserfs_dir_entry *de);
int search_by_entry_key(struct super_block *sb, const struct cpu_key *key,
			struct treepath *path, struct reiserfs_dir_entry *de);
struct dentry *reiserfs_get_parent(struct dentry *);

#ifdef CONFIG_REISERFS_PROC_INFO
int reiserfs_proc_info_init(struct super_block *sb);
int reiserfs_proc_info_done(struct super_block *sb);
int reiserfs_proc_info_global_init(void);
int reiserfs_proc_info_global_done(void);

#define PROC_EXP( e )   e

#define __PINFO( sb ) REISERFS_SB(sb) -> s_proc_info_data
#define PROC_INFO_MAX( sb, field, value )								\
    __PINFO( sb ).field =												\
        max( REISERFS_SB( sb ) -> s_proc_info_data.field, value )
#define PROC_INFO_INC( sb, field ) ( ++ ( __PINFO( sb ).field ) )
#define PROC_INFO_ADD( sb, field, val ) ( __PINFO( sb ).field += ( val ) )
#define PROC_INFO_BH_STAT( sb, bh, level )							\
    PROC_INFO_INC( sb, sbk_read_at[ ( level ) ] );						\
    PROC_INFO_ADD( sb, free_at[ ( level ) ], B_FREE_SPACE( bh ) );	\
    PROC_INFO_ADD( sb, items_at[ ( level ) ], B_NR_ITEMS( bh ) )
#else
static inline int reiserfs_proc_info_init(struct super_block *sb)
{
	return 0;
}

static inline int reiserfs_proc_info_done(struct super_block *sb)
{
	return 0;
}

static inline int reiserfs_proc_info_global_init(void)
{
	return 0;
}

static inline int reiserfs_proc_info_global_done(void)
{
	return 0;
}

#define PROC_EXP( e )
#define VOID_V ( ( void ) 0 )
#define PROC_INFO_MAX( sb, field, value ) VOID_V
#define PROC_INFO_INC( sb, field ) VOID_V
#define PROC_INFO_ADD( sb, field, val ) VOID_V
#define PROC_INFO_BH_STAT(sb, bh, n_node_level) VOID_V
#endif

/* dir.c */
extern const struct inode_operations reiserfs_dir_inode_operations;
extern const struct inode_operations reiserfs_symlink_inode_operations;
extern const struct inode_operations reiserfs_special_inode_operations;
extern const struct file_operations reiserfs_dir_operations;
int reiserfs_readdir_inode(struct inode *, struct dir_context *);

/* tail_conversion.c */
int direct2indirect(struct reiserfs_transaction_handle *, struct inode *,
		    struct treepath *, struct buffer_head *, loff_t);
int indirect2direct(struct reiserfs_transaction_handle *, struct inode *,
		    struct page *, struct treepath *, const struct cpu_key *,
		    loff_t, char *);
void reiserfs_unmap_buffer(struct buffer_head *);

/* file.c */
extern const struct inode_operations reiserfs_file_inode_operations;
extern const struct file_operations reiserfs_file_operations;
extern const struct address_space_operations reiserfs_address_space_operations;

/* fix_nodes.c */

int fix_nodes(int n_op_mode, struct tree_balance *tb,
	      struct item_head *ins_ih, const void *);
void unfix_nodes(struct tree_balance *);

/* prints.c */
void __reiserfs_panic(struct super_block *s, const char *id,
		      const char *function, const char *fmt, ...)
    __attribute__ ((noreturn));
#define reiserfs_panic(s, id, fmt, args...) \
	__reiserfs_panic(s, id, __func__, fmt, ##args)
void __reiserfs_error(struct super_block *s, const char *id,
		      const char *function, const char *fmt, ...);
#define reiserfs_error(s, id, fmt, args...) \
	 __reiserfs_error(s, id, __func__, fmt, ##args)
void reiserfs_info(struct super_block *s, const char *fmt, ...);
void reiserfs_debug(struct super_block *s, int level, const char *fmt, ...);
void print_indirect_item(struct buffer_head *bh, int item_num);
void store_print_tb(struct tree_balance *tb);
void print_cur_tb(char *mes);
void print_de(struct reiserfs_dir_entry *de);
void print_bi(struct buffer_info *bi, char *mes);
#define PRINT_LEAF_ITEMS 1	/* print all items */
#define PRINT_DIRECTORY_ITEMS 2	/* print directory items */
#define PRINT_DIRECT_ITEMS 4	/* print contents of direct items */
void print_block(struct buffer_head *bh, ...);
void print_bmap(struct super_block *s, int silent);
void print_bmap_block(int i, char *data, int size, int silent);
/*void print_super_block (struct super_block * s, char * mes);*/
void print_objectid_map(struct super_block *s);
void print_block_head(struct buffer_head *bh, char *mes);
void check_leaf(struct buffer_head *bh);
void check_internal(struct buffer_head *bh);
void print_statistics(struct super_block *s);
char *reiserfs_hashname(int code);

/* lbalance.c */
int leaf_move_items(int shift_mode, struct tree_balance *tb, int mov_num,
		    int mov_bytes, struct buffer_head *Snew);
int leaf_shift_left(struct tree_balance *tb, int shift_num, int shift_bytes);
int leaf_shift_right(struct tree_balance *tb, int shift_num, int shift_bytes);
void leaf_delete_items(struct buffer_info *cur_bi, int last_first, int first,
		       int del_num, int del_bytes);
void leaf_insert_into_buf(struct buffer_info *bi, int before,
			  struct item_head * const inserted_item_ih,
			  const char * const inserted_item_body,
			  int zeros_number);
void leaf_paste_in_buffer(struct buffer_info *bi, int pasted_item_num,
			  int pos_in_item, int paste_size,
			  const char * const body, int zeros_number);
void leaf_cut_from_buffer(struct buffer_info *bi, int cut_item_num,
			  int pos_in_item, int cut_size);
void leaf_paste_entries(struct buffer_info *bi, int item_num, int before,
			int new_entry_count, struct reiserfs_de_head *new_dehs,
			const char *records, int paste_size);
/* ibalance.c */
int balance_internal(struct tree_balance *, int, int, struct item_head *,
		     struct buffer_head **);

/* do_balance.c */
void do_balance_mark_leaf_dirty(struct tree_balance *tb,
				struct buffer_head *bh, int flag);
#define do_balance_mark_internal_dirty do_balance_mark_leaf_dirty
#define do_balance_mark_sb_dirty do_balance_mark_leaf_dirty

void do_balance(struct tree_balance *tb, struct item_head *ih,
		const char *body, int flag);
void reiserfs_invalidate_buffer(struct tree_balance *tb,
				struct buffer_head *bh);

int get_left_neighbor_position(struct tree_balance *tb, int h);
int get_right_neighbor_position(struct tree_balance *tb, int h);
void replace_key(struct tree_balance *tb, struct buffer_head *, int,
		 struct buffer_head *, int);
void make_empty_node(struct buffer_info *);
struct buffer_head *get_FEB(struct tree_balance *);

/* bitmap.c */

/*
 * structure contains hints for block allocator, and it is a container for
 * arguments, such as node, search path, transaction_handle, etc.
 */
struct __reiserfs_blocknr_hint {
	/* inode passed to allocator, if we allocate unf. nodes */
	struct inode *inode;

	sector_t block;		/* file offset, in blocks */
	struct in_core_key key;

	/*
	 * search path, used by allocator to deternine search_start by
	 * various ways
	 */
	struct treepath *path;

	/*
	 * transaction handle is needed to log super blocks
	 * and bitmap blocks changes
	 */
	struct reiserfs_transaction_handle *th;

	b_blocknr_t beg, end;

	/*
	 * a field used to transfer search start value (block number)
	 * between different block allocator procedures
	 * (determine_search_start() and others)
	 */
	b_blocknr_t search_start;

	/*
	 * is set in determine_prealloc_size() function,
	 * used by underlayed function that do actual allocation
	 */
	int prealloc_size;

	/*
	 * the allocator uses different polices for getting disk
	 * space for formatted/unformatted blocks with/without preallocation
	 */
	unsigned formatted_node:1;
	unsigned preallocate:1;
};

typedef struct __reiserfs_blocknr_hint reiserfs_blocknr_hint_t;

int reiserfs_parse_alloc_options(struct super_block *, char *);
void reiserfs_init_alloc_options(struct super_block *s);

/*
 * given a directory, this will tell you what packing locality
 * to use for a new object underneat it.  The locality is returned
 * in disk byte order (le).
 */
__le32 reiserfs_choose_packing(struct inode *dir);

void show_alloc_options(struct seq_file *seq, struct super_block *s);
int reiserfs_init_bitmap_cache(struct super_block *sb);
void reiserfs_free_bitmap_cache(struct super_block *sb);
void reiserfs_cache_bitmap_metadata(struct super_block *sb, struct buffer_head *bh, struct reiserfs_bitmap_info *info);
struct buffer_head *reiserfs_read_bitmap_block(struct super_block *sb, unsigned int bitmap);
int is_reusable(struct super_block *s, b_blocknr_t block, int bit_value);
void reiserfs_free_block(struct reiserfs_transaction_handle *th, struct inode *,
			 b_blocknr_t, int for_unformatted);
int reiserfs_allocate_blocknrs(reiserfs_blocknr_hint_t *, b_blocknr_t *, int,
			       int);
static inline int reiserfs_new_form_blocknrs(struct tree_balance *tb,
					     b_blocknr_t * new_blocknrs,
					     int amount_needed)
{
	reiserfs_blocknr_hint_t hint = {
		.th = tb->transaction_handle,
		.path = tb->tb_path,
		.inode = NULL,
		.key = tb->key,
		.block = 0,
		.formatted_node = 1
	};
	return reiserfs_allocate_blocknrs(&hint, new_blocknrs, amount_needed,
					  0);
}

static inline int reiserfs_new_unf_blocknrs(struct reiserfs_transaction_handle
					    *th, struct inode *inode,
					    b_blocknr_t * new_blocknrs,
					    struct treepath *path,
					    sector_t block)
{
	reiserfs_blocknr_hint_t hint = {
		.th = th,
		.path = path,
		.inode = inode,
		.block = block,
		.formatted_node = 0,
		.preallocate = 0
	};
	return reiserfs_allocate_blocknrs(&hint, new_blocknrs, 1, 0);
}

#ifdef REISERFS_PREALLOCATE
static inline int reiserfs_new_unf_blocknrs2(struct reiserfs_transaction_handle
					     *th, struct inode *inode,
					     b_blocknr_t * new_blocknrs,
					     struct treepath *path,
					     sector_t block)
{
	reiserfs_blocknr_hint_t hint = {
		.th = th,
		.path = path,
		.inode = inode,
		.block = block,
		.formatted_node = 0,
		.preallocate = 1
	};
	return reiserfs_allocate_blocknrs(&hint, new_blocknrs, 1, 0);
}

void reiserfs_discard_prealloc(struct reiserfs_transaction_handle *th,
			       struct inode *inode);
void reiserfs_discard_all_prealloc(struct reiserfs_transaction_handle *th);
#endif

/* hashes.c */
__u32 keyed_hash(const signed char *msg, int len);
__u32 yura_hash(const signed char *msg, int len);
__u32 r5_hash(const signed char *msg, int len);

#define reiserfs_set_le_bit		__set_bit_le
#define reiserfs_test_and_set_le_bit	__test_and_set_bit_le
#define reiserfs_clear_le_bit		__clear_bit_le
#define reiserfs_test_and_clear_le_bit	__test_and_clear_bit_le
#define reiserfs_test_le_bit		test_bit_le
#define reiserfs_find_next_zero_le_bit	find_next_zero_bit_le

/*
 * sometimes reiserfs_truncate may require to allocate few new blocks
 * to perform indirect2direct conversion. People probably used to
 * think, that truncate should work without problems on a filesystem
 * without free disk space. They may complain that they can not
 * truncate due to lack of free disk space. This spare space allows us
 * to not worry about it. 500 is probably too much, but it should be
 * absolutely safe
 */
#define SPARE_SPACE 500

/* prototypes from ioctl.c */
long reiserfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
long reiserfs_compat_ioctl(struct file *filp,
		   unsigned int cmd, unsigned long arg);
int reiserfs_unpack(struct inode *inode, struct file *filp);