summaryrefslogtreecommitdiffstats
path: root/fs/reiserfs/namei.c
blob: 763239a7e8dd76317d6ddd87f08153ae97c663d2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
/*
 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
 *
 * Trivial changes by Alan Cox to remove EHASHCOLLISION for compatibility
 *
 * Trivial Changes:
 * Rights granted to Hans Reiser to redistribute under other terms providing
 * he accepts all liability including but not limited to patent, fitness
 * for purpose, and direct or indirect claims arising from failure to perform.
 *
 * NO WARRANTY
 */

#include <linux/time.h>
#include <linux/bitops.h>
#include <linux/slab.h>
#include <linux/reiserfs_fs.h>
#include <linux/reiserfs_acl.h>
#include <linux/reiserfs_xattr.h>
#include <linux/quotaops.h>

#define INC_DIR_INODE_NLINK(i) if (i->i_nlink != 1) { inc_nlink(i); if (i->i_nlink >= REISERFS_LINK_MAX) set_nlink(i, 1); }
#define DEC_DIR_INODE_NLINK(i) if (i->i_nlink != 1) drop_nlink(i);

// directory item contains array of entry headers. This performs
// binary search through that array
static int bin_search_in_dir_item(struct reiserfs_dir_entry *de, loff_t off)
{
	struct item_head *ih = de->de_ih;
	struct reiserfs_de_head *deh = de->de_deh;
	int rbound, lbound, j;

	lbound = 0;
	rbound = I_ENTRY_COUNT(ih) - 1;

	for (j = (rbound + lbound) / 2; lbound <= rbound;
	     j = (rbound + lbound) / 2) {
		if (off < deh_offset(deh + j)) {
			rbound = j - 1;
			continue;
		}
		if (off > deh_offset(deh + j)) {
			lbound = j + 1;
			continue;
		}
		// this is not name found, but matched third key component
		de->de_entry_num = j;
		return NAME_FOUND;
	}

	de->de_entry_num = lbound;
	return NAME_NOT_FOUND;
}

// comment?  maybe something like set de to point to what the path points to?
static inline void set_de_item_location(struct reiserfs_dir_entry *de,
					struct treepath *path)
{
	de->de_bh = get_last_bh(path);
	de->de_ih = get_ih(path);
	de->de_deh = B_I_DEH(de->de_bh, de->de_ih);
	de->de_item_num = PATH_LAST_POSITION(path);
}

// de_bh, de_ih, de_deh (points to first element of array), de_item_num is set
inline void set_de_name_and_namelen(struct reiserfs_dir_entry *de)
{
	struct reiserfs_de_head *deh = de->de_deh + de->de_entry_num;

	BUG_ON(de->de_entry_num >= ih_entry_count(de->de_ih));

	de->de_entrylen = entry_length(de->de_bh, de->de_ih, de->de_entry_num);
	de->de_namelen = de->de_entrylen - (de_with_sd(deh) ? SD_SIZE : 0);
	de->de_name = B_I_PITEM(de->de_bh, de->de_ih) + deh_location(deh);
	if (de->de_name[de->de_namelen - 1] == 0)
		de->de_namelen = strlen(de->de_name);
}

// what entry points to
static inline void set_de_object_key(struct reiserfs_dir_entry *de)
{
	BUG_ON(de->de_entry_num >= ih_entry_count(de->de_ih));
	de->de_dir_id = deh_dir_id(&(de->de_deh[de->de_entry_num]));
	de->de_objectid = deh_objectid(&(de->de_deh[de->de_entry_num]));
}

static inline void store_de_entry_key(struct reiserfs_dir_entry *de)
{
	struct reiserfs_de_head *deh = de->de_deh + de->de_entry_num;

	BUG_ON(de->de_entry_num >= ih_entry_count(de->de_ih));

	/* store key of the found entry */
	de->de_entry_key.version = KEY_FORMAT_3_5;
	de->de_entry_key.on_disk_key.k_dir_id =
	    le32_to_cpu(de->de_ih->ih_key.k_dir_id);
	de->de_entry_key.on_disk_key.k_objectid =
	    le32_to_cpu(de->de_ih->ih_key.k_objectid);
	set_cpu_key_k_offset(&(de->de_entry_key), deh_offset(deh));
	set_cpu_key_k_type(&(de->de_entry_key), TYPE_DIRENTRY);
}

/* We assign a key to each directory item, and place multiple entries
in a single directory item.  A directory item has a key equal to the
key of the first directory entry in it.

This function first calls search_by_key, then, if item whose first
entry matches is not found it looks for the entry inside directory
item found by search_by_key. Fills the path to the entry, and to the
entry position in the item

*/

/* The function is NOT SCHEDULE-SAFE! */
int search_by_entry_key(struct super_block *sb, const struct cpu_key *key,
			struct treepath *path, struct reiserfs_dir_entry *de)
{
	int retval;

	retval = search_item(sb, key, path);
	switch (retval) {
	case ITEM_NOT_FOUND:
		if (!PATH_LAST_POSITION(path)) {
			reiserfs_error(sb, "vs-7000", "search_by_key "
				       "returned item position == 0");
			pathrelse(path);
			return IO_ERROR;
		}
		PATH_LAST_POSITION(path)--;

	case ITEM_FOUND:
		break;

	case IO_ERROR:
		return retval;

	default:
		pathrelse(path);
		reiserfs_error(sb, "vs-7002", "no path to here");
		return IO_ERROR;
	}

	set_de_item_location(de, path);

#ifdef CONFIG_REISERFS_CHECK
	if (!is_direntry_le_ih(de->de_ih) ||
	    COMP_SHORT_KEYS(&(de->de_ih->ih_key), key)) {
		print_block(de->de_bh, 0, -1, -1);
		reiserfs_panic(sb, "vs-7005", "found item %h is not directory "
			       "item or does not belong to the same directory "
			       "as key %K", de->de_ih, key);
	}
#endif				/* CONFIG_REISERFS_CHECK */

	/* binary search in directory item by third componen t of the
	   key. sets de->de_entry_num of de */
	retval = bin_search_in_dir_item(de, cpu_key_k_offset(key));
	path->pos_in_item = de->de_entry_num;
	if (retval != NAME_NOT_FOUND) {
		// ugly, but rename needs de_bh, de_deh, de_name, de_namelen, de_objectid set
		set_de_name_and_namelen(de);
		set_de_object_key(de);
	}
	return retval;
}

/* Keyed 32-bit hash function using TEA in a Davis-Meyer function */

/* The third component is hashed, and you can choose from more than
   one hash function.  Per directory hashes are not yet implemented
   but are thought about. This function should be moved to hashes.c
   Jedi, please do so.  -Hans */

static __u32 get_third_component(struct super_block *s,
				 const char *name, int len)
{
	__u32 res;

	if (!len || (len == 1 && name[0] == '.'))
		return DOT_OFFSET;
	if (len == 2 && name[0] == '.' && name[1] == '.')
		return DOT_DOT_OFFSET;

	res = REISERFS_SB(s)->s_hash_function(name, len);

	// take bits from 7-th to 30-th including both bounds
	res = GET_HASH_VALUE(res);
	if (res == 0)
		// needed to have no names before "." and ".." those have hash
		// value == 0 and generation conters 1 and 2 accordingly
		res = 128;
	return res + MAX_GENERATION_NUMBER;
}

static int reiserfs_match(struct reiserfs_dir_entry *de,
			  const char *name, int namelen)
{
	int retval = NAME_NOT_FOUND;

	if ((namelen == de->de_namelen) &&
	    !memcmp(de->de_name, name, de->de_namelen))
		retval =
		    (de_visible(de->de_deh + de->de_entry_num) ? NAME_FOUND :
		     NAME_FOUND_INVISIBLE);

	return retval;
}

/* de's de_bh, de_ih, de_deh, de_item_num, de_entry_num are set already */

				/* used when hash collisions exist */

static int linear_search_in_dir_item(struct cpu_key *key,
				     struct reiserfs_dir_entry *de,
				     const char *name, int namelen)
{
	struct reiserfs_de_head *deh = de->de_deh;
	int retval;
	int i;

	i = de->de_entry_num;

	if (i == I_ENTRY_COUNT(de->de_ih) ||
	    GET_HASH_VALUE(deh_offset(deh + i)) !=
	    GET_HASH_VALUE(cpu_key_k_offset(key))) {
		i--;
	}

	RFALSE(de->de_deh != B_I_DEH(de->de_bh, de->de_ih),
	       "vs-7010: array of entry headers not found");

	deh += i;

	for (; i >= 0; i--, deh--) {
		if (GET_HASH_VALUE(deh_offset(deh)) !=
		    GET_HASH_VALUE(cpu_key_k_offset(key))) {
			// hash value does not match, no need to check whole name
			return NAME_NOT_FOUND;
		}

		/* mark, that this generation number is used */
		if (de->de_gen_number_bit_string)
			set_bit(GET_GENERATION_NUMBER(deh_offset(deh)),
				de->de_gen_number_bit_string);

		// calculate pointer to name and namelen
		de->de_entry_num = i;
		set_de_name_and_namelen(de);

		if ((retval =
		     reiserfs_match(de, name, namelen)) != NAME_NOT_FOUND) {
			// de's de_name, de_namelen, de_recordlen are set. Fill the rest:

			// key of pointed object
			set_de_object_key(de);

			store_de_entry_key(de);

			// retval can be NAME_FOUND or NAME_FOUND_INVISIBLE
			return retval;
		}
	}

	if (GET_GENERATION_NUMBER(le_ih_k_offset(de->de_ih)) == 0)
		/* we have reached left most entry in the node. In common we
		   have to go to the left neighbor, but if generation counter
		   is 0 already, we know for sure, that there is no name with
		   the same hash value */
		// FIXME: this work correctly only because hash value can not
		// be 0. Btw, in case of Yura's hash it is probably possible,
		// so, this is a bug
		return NAME_NOT_FOUND;

	RFALSE(de->de_item_num,
	       "vs-7015: two diritems of the same directory in one node?");

	return GOTO_PREVIOUS_ITEM;
}

// may return NAME_FOUND, NAME_FOUND_INVISIBLE, NAME_NOT_FOUND
// FIXME: should add something like IOERROR
static int reiserfs_find_entry(struct inode *dir, const char *name, int namelen,
			       struct treepath *path_to_entry,
			       struct reiserfs_dir_entry *de)
{
	struct cpu_key key_to_search;
	int retval;

	if (namelen > REISERFS_MAX_NAME(dir->i_sb->s_blocksize))
		return NAME_NOT_FOUND;

	/* we will search for this key in the tree */
	make_cpu_key(&key_to_search, dir,
		     get_third_component(dir->i_sb, name, namelen),
		     TYPE_DIRENTRY, 3);

	while (1) {
		retval =
		    search_by_entry_key(dir->i_sb, &key_to_search,
					path_to_entry, de);
		if (retval == IO_ERROR) {
			reiserfs_error(dir->i_sb, "zam-7001", "io error");
			return IO_ERROR;
		}

		/* compare names for all entries having given hash value */
		retval =
		    linear_search_in_dir_item(&key_to_search, de, name,
					      namelen);
		if (retval != GOTO_PREVIOUS_ITEM) {
			/* there is no need to scan directory anymore. Given entry found or does not exist */
			path_to_entry->pos_in_item = de->de_entry_num;
			return retval;
		}

		/* there is left neighboring item of this directory and given entry can be there */
		set_cpu_key_k_offset(&key_to_search,
				     le_ih_k_offset(de->de_ih) - 1);
		pathrelse(path_to_entry);

	}			/* while (1) */
}

static struct dentry *reiserfs_lookup(struct inode *dir, struct dentry *dentry,
				      struct nameidata *nd)
{
	int retval;
	int lock_depth;
	struct inode *inode = NULL;
	struct reiserfs_dir_entry de;
	INITIALIZE_PATH(path_to_entry);

	if (REISERFS_MAX_NAME(dir->i_sb->s_blocksize) < dentry->d_name.len)
		return ERR_PTR(-ENAMETOOLONG);

	/*
	 * Might be called with or without the write lock, must be careful
	 * to not recursively hold it in case we want to release the lock
	 * before rescheduling.
	 */
	lock_depth = reiserfs_write_lock_once(dir->i_sb);

	de.de_gen_number_bit_string = NULL;
	retval =
	    reiserfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len,
				&path_to_entry, &de);
	pathrelse(&path_to_entry);
	if (retval == NAME_FOUND) {
		inode = reiserfs_iget(dir->i_sb,
				      (struct cpu_key *)&(de.de_dir_id));
		if (!inode || IS_ERR(inode)) {
			reiserfs_write_unlock_once(dir->i_sb, lock_depth);
			return ERR_PTR(-EACCES);
		}

		/* Propagate the private flag so we know we're
		 * in the priv tree */
		if (IS_PRIVATE(dir))
			inode->i_flags |= S_PRIVATE;
	}
	reiserfs_write_unlock_once(dir->i_sb, lock_depth);
	if (retval == IO_ERROR) {
		return ERR_PTR(-EIO);
	}

	return d_splice_alias(inode, dentry);
}

/*
** looks up the dentry of the parent directory for child.
** taken from ext2_get_parent
*/
struct dentry *reiserfs_get_parent(struct dentry *child)
{
	int retval;
	struct inode *inode = NULL;
	struct reiserfs_dir_entry de;
	INITIALIZE_PATH(path_to_entry);
	struct inode *dir = child->d_inode;

	if (dir->i_nlink == 0) {
		return ERR_PTR(-ENOENT);
	}
	de.de_gen_number_bit_string = NULL;

	reiserfs_write_lock(dir->i_sb);
	retval = reiserfs_find_entry(dir, "..", 2, &path_to_entry, &de);
	pathrelse(&path_to_entry);
	if (retval != NAME_FOUND) {
		reiserfs_write_unlock(dir->i_sb);
		return ERR_PTR(-ENOENT);
	}
	inode = reiserfs_iget(dir->i_sb, (struct cpu_key *)&(de.de_dir_id));
	reiserfs_write_unlock(dir->i_sb);

	return d_obtain_alias(inode);
}

/* add entry to the directory (entry can be hidden).

insert definition of when hidden directories are used here -Hans

 Does not mark dir   inode dirty, do it after successesfull call to it */

static int reiserfs_add_entry(struct reiserfs_transaction_handle *th,
			      struct inode *dir, const char *name, int namelen,
			      struct inode *inode, int visible)
{
	struct cpu_key entry_key;
	struct reiserfs_de_head *deh;
	INITIALIZE_PATH(path);
	struct reiserfs_dir_entry de;
	DECLARE_BITMAP(bit_string, MAX_GENERATION_NUMBER + 1);
	int gen_number;
	char small_buf[32 + DEH_SIZE];	/* 48 bytes now and we avoid kmalloc
					   if we create file with short name */
	char *buffer;
	int buflen, paste_size;
	int retval;

	BUG_ON(!th->t_trans_id);

	/* cannot allow items to be added into a busy deleted directory */
	if (!namelen)
		return -EINVAL;

	if (namelen > REISERFS_MAX_NAME(dir->i_sb->s_blocksize))
		return -ENAMETOOLONG;

	/* each entry has unique key. compose it */
	make_cpu_key(&entry_key, dir,
		     get_third_component(dir->i_sb, name, namelen),
		     TYPE_DIRENTRY, 3);

	/* get memory for composing the entry */
	buflen = DEH_SIZE + ROUND_UP(namelen);
	if (buflen > sizeof(small_buf)) {
		buffer = kmalloc(buflen, GFP_NOFS);
		if (!buffer)
			return -ENOMEM;
	} else
		buffer = small_buf;

	paste_size =
	    (get_inode_sd_version(dir) ==
	     STAT_DATA_V1) ? (DEH_SIZE + namelen) : buflen;

	/* fill buffer : directory entry head, name[, dir objectid | , stat data | ,stat data, dir objectid ] */
	deh = (struct reiserfs_de_head *)buffer;
	deh->deh_location = 0;	/* JDM Endian safe if 0 */
	put_deh_offset(deh, cpu_key_k_offset(&entry_key));
	deh->deh_state = 0;	/* JDM Endian safe if 0 */
	/* put key (ino analog) to de */
	deh->deh_dir_id = INODE_PKEY(inode)->k_dir_id;	/* safe: k_dir_id is le */
	deh->deh_objectid = INODE_PKEY(inode)->k_objectid;	/* safe: k_objectid is le */

	/* copy name */
	memcpy((char *)(deh + 1), name, namelen);
	/* padd by 0s to the 4 byte boundary */
	padd_item((char *)(deh + 1), ROUND_UP(namelen), namelen);

	/* entry is ready to be pasted into tree, set 'visibility' and 'stat data in entry' attributes */
	mark_de_without_sd(deh);
	visible ? mark_de_visible(deh) : mark_de_hidden(deh);

	/* find the proper place for the new entry */
	memset(bit_string, 0, sizeof(bit_string));
	de.de_gen_number_bit_string = bit_string;
	retval = reiserfs_find_entry(dir, name, namelen, &path, &de);
	if (retval != NAME_NOT_FOUND) {
		if (buffer != small_buf)
			kfree(buffer);
		pathrelse(&path);

		if (retval == IO_ERROR) {
			return -EIO;
		}

		if (retval != NAME_FOUND) {
			reiserfs_error(dir->i_sb, "zam-7002",
				       "reiserfs_find_entry() returned "
				       "unexpected value (%d)", retval);
		}

		return -EEXIST;
	}

	gen_number =
	    find_first_zero_bit(bit_string,
				MAX_GENERATION_NUMBER + 1);
	if (gen_number > MAX_GENERATION_NUMBER) {
		/* there is no free generation number */
		reiserfs_warning(dir->i_sb, "reiserfs-7010",
				 "Congratulations! we have got hash function "
				 "screwed up");
		if (buffer != small_buf)
			kfree(buffer);
		pathrelse(&path);
		return -EBUSY;
	}
	/* adjust offset of directory enrty */
	put_deh_offset(deh, SET_GENERATION_NUMBER(deh_offset(deh), gen_number));
	set_cpu_key_k_offset(&entry_key, deh_offset(deh));

	/* update max-hash-collisions counter in reiserfs_sb_info */
	PROC_INFO_MAX(th->t_super, max_hash_collisions, gen_number);

	if (gen_number != 0) {	/* we need to re-search for the insertion point */
		if (search_by_entry_key(dir->i_sb, &entry_key, &path, &de) !=
		    NAME_NOT_FOUND) {
			reiserfs_warning(dir->i_sb, "vs-7032",
					 "entry with this key (%K) already "
					 "exists", &entry_key);

			if (buffer != small_buf)
				kfree(buffer);
			pathrelse(&path);
			return -EBUSY;
		}
	}

	/* perform the insertion of the entry that we have prepared */
	retval =
	    reiserfs_paste_into_item(th, &path, &entry_key, dir, buffer,
				     paste_size);
	if (buffer != small_buf)
		kfree(buffer);
	if (retval) {
		reiserfs_check_path(&path);
		return retval;
	}

	dir->i_size += paste_size;
	dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
	if (!S_ISDIR(inode->i_mode) && visible)
		// reiserfs_mkdir or reiserfs_rename will do that by itself
		reiserfs_update_sd(th, dir);

	reiserfs_check_path(&path);
	return 0;
}

/* quota utility function, call if you've had to abort after calling
** new_inode_init, and have not called reiserfs_new_inode yet.
** This should only be called on inodes that do not have stat data
** inserted into the tree yet.
*/
static int drop_new_inode(struct inode *inode)
{
	dquot_drop(inode);
	make_bad_inode(inode);
	inode->i_flags |= S_NOQUOTA;
	iput(inode);
	return 0;
}

/* utility function that does setup for reiserfs_new_inode.
** dquot_initialize needs lots of credits so it's better to have it
** outside of a transaction, so we had to pull some bits of
** reiserfs_new_inode out into this func.
*/
static int new_inode_init(struct inode *inode, struct inode *dir, int mode)
{
	/* Make inode invalid - just in case we are going to drop it before
	 * the initialization happens */
	INODE_PKEY(inode)->k_objectid = 0;
	/* the quota init calls have to know who to charge the quota to, so
	 ** we have to set uid and gid here
	 */
	inode_init_owner(inode, dir, mode);
	dquot_initialize(inode);
	return 0;
}

static int reiserfs_create(struct inode *dir, struct dentry *dentry, int mode,
			   struct nameidata *nd)
{
	int retval;
	struct inode *inode;
	/* We need blocks for transaction + (user+group)*(quotas for new inode + update of quota for directory owner) */
	int jbegin_count =
	    JOURNAL_PER_BALANCE_CNT * 2 +
	    2 * (REISERFS_QUOTA_INIT_BLOCKS(dir->i_sb) +
		 REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb));
	struct reiserfs_transaction_handle th;
	struct reiserfs_security_handle security;

	dquot_initialize(dir);

	if (!(inode = new_inode(dir->i_sb))) {
		return -ENOMEM;
	}
	new_inode_init(inode, dir, mode);

	jbegin_count += reiserfs_cache_default_acl(dir);
	retval = reiserfs_security_init(dir, inode, &dentry->d_name, &security);
	if (retval < 0) {
		drop_new_inode(inode);
		return retval;
	}
	jbegin_count += retval;
	reiserfs_write_lock(dir->i_sb);

	retval = journal_begin(&th, dir->i_sb, jbegin_count);
	if (retval) {
		drop_new_inode(inode);
		goto out_failed;
	}

	retval =
	    reiserfs_new_inode(&th, dir, mode, NULL, 0 /*i_size */ , dentry,
			       inode, &security);
	if (retval)
		goto out_failed;

	inode->i_op = &reiserfs_file_inode_operations;
	inode->i_fop = &reiserfs_file_operations;
	inode->i_mapping->a_ops = &reiserfs_address_space_operations;

	retval =
	    reiserfs_add_entry(&th, dir, dentry->d_name.name,
			       dentry->d_name.len, inode, 1 /*visible */ );
	if (retval) {
		int err;
		drop_nlink(inode);
		reiserfs_update_sd(&th, inode);
		err = journal_end(&th, dir->i_sb, jbegin_count);
		if (err)
			retval = err;
		unlock_new_inode(inode);
		iput(inode);
		goto out_failed;
	}
	reiserfs_update_inode_transaction(inode);
	reiserfs_update_inode_transaction(dir);

	d_instantiate(dentry, inode);
	unlock_new_inode(inode);
	retval = journal_end(&th, dir->i_sb, jbegin_count);

      out_failed:
	reiserfs_write_unlock(dir->i_sb);
	return retval;
}

static int reiserfs_mknod(struct inode *dir, struct dentry *dentry, int mode,
			  dev_t rdev)
{
	int retval;
	struct inode *inode;
	struct reiserfs_transaction_handle th;
	struct reiserfs_security_handle security;
	/* We need blocks for transaction + (user+group)*(quotas for new inode + update of quota for directory owner) */
	int jbegin_count =
	    JOURNAL_PER_BALANCE_CNT * 3 +
	    2 * (REISERFS_QUOTA_INIT_BLOCKS(dir->i_sb) +
		 REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb));

	if (!new_valid_dev(rdev))
		return -EINVAL;

	dquot_initialize(dir);

	if (!(inode = new_inode(dir->i_sb))) {
		return -ENOMEM;
	}
	new_inode_init(inode, dir, mode);

	jbegin_count += reiserfs_cache_default_acl(dir);
	retval = reiserfs_security_init(dir, inode, &dentry->d_name, &security);
	if (retval < 0) {
		drop_new_inode(inode);
		return retval;
	}
	jbegin_count += retval;
	reiserfs_write_lock(dir->i_sb);

	retval = journal_begin(&th, dir->i_sb, jbegin_count);
	if (retval) {
		drop_new_inode(inode);
		goto out_failed;
	}

	retval =
	    reiserfs_new_inode(&th, dir, mode, NULL, 0 /*i_size */ , dentry,
			       inode, &security);
	if (retval) {
		goto out_failed;
	}

	inode->i_op = &reiserfs_special_inode_operations;
	init_special_inode(inode, inode->i_mode, rdev);

	//FIXME: needed for block and char devices only
	reiserfs_update_sd(&th, inode);

	reiserfs_update_inode_transaction(inode);
	reiserfs_update_inode_transaction(dir);

	retval =
	    reiserfs_add_entry(&th, dir, dentry->d_name.name,
			       dentry->d_name.len, inode, 1 /*visible */ );
	if (retval) {
		int err;
		drop_nlink(inode);
		reiserfs_update_sd(&th, inode);
		err = journal_end(&th, dir->i_sb, jbegin_count);
		if (err)
			retval = err;
		unlock_new_inode(inode);
		iput(inode);
		goto out_failed;
	}

	d_instantiate(dentry, inode);
	unlock_new_inode(inode);
	retval = journal_end(&th, dir->i_sb, jbegin_count);

      out_failed:
	reiserfs_write_unlock(dir->i_sb);
	return retval;
}

static int reiserfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
	int retval;
	struct inode *inode;
	struct reiserfs_transaction_handle th;
	struct reiserfs_security_handle security;
	int lock_depth;
	/* We need blocks for transaction + (user+group)*(quotas for new inode + update of quota for directory owner) */
	int jbegin_count =
	    JOURNAL_PER_BALANCE_CNT * 3 +
	    2 * (REISERFS_QUOTA_INIT_BLOCKS(dir->i_sb) +
		 REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb));

	dquot_initialize(dir);

#ifdef DISPLACE_NEW_PACKING_LOCALITIES
	/* set flag that new packing locality created and new blocks for the content     * of that directory are not displaced yet */
	REISERFS_I(dir)->new_packing_locality = 1;
#endif
	mode = S_IFDIR | mode;
	if (!(inode = new_inode(dir->i_sb))) {
		return -ENOMEM;
	}
	new_inode_init(inode, dir, mode);

	jbegin_count += reiserfs_cache_default_acl(dir);
	retval = reiserfs_security_init(dir, inode, &dentry->d_name, &security);
	if (retval < 0) {
		drop_new_inode(inode);
		return retval;
	}
	jbegin_count += retval;
	lock_depth = reiserfs_write_lock_once(dir->i_sb);

	retval = journal_begin(&th, dir->i_sb, jbegin_count);
	if (retval) {
		drop_new_inode(inode);
		goto out_failed;
	}

	/* inc the link count now, so another writer doesn't overflow it while
	 ** we sleep later on.
	 */
	INC_DIR_INODE_NLINK(dir)

	    retval = reiserfs_new_inode(&th, dir, mode, NULL /*symlink */ ,
					old_format_only(dir->i_sb) ?
					EMPTY_DIR_SIZE_V1 : EMPTY_DIR_SIZE,
					dentry, inode, &security);
	if (retval) {
		DEC_DIR_INODE_NLINK(dir)
		goto out_failed;
	}

	reiserfs_update_inode_transaction(inode);
	reiserfs_update_inode_transaction(dir);

	inode->i_op = &reiserfs_dir_inode_operations;
	inode->i_fop = &reiserfs_dir_operations;

	// note, _this_ add_entry will not update dir's stat data
	retval =
	    reiserfs_add_entry(&th, dir, dentry->d_name.name,
			       dentry->d_name.len, inode, 1 /*visible */ );
	if (retval) {
		int err;
		clear_nlink(inode);
		DEC_DIR_INODE_NLINK(dir);
		reiserfs_update_sd(&th, inode);
		err = journal_end(&th, dir->i_sb, jbegin_count);
		if (err)
			retval = err;
		unlock_new_inode(inode);
		iput(inode);
		goto out_failed;
	}
	// the above add_entry did not update dir's stat data
	reiserfs_update_sd(&th, dir);

	d_instantiate(dentry, inode);
	unlock_new_inode(inode);
	retval = journal_end(&th, dir->i_sb, jbegin_count);
out_failed:
	reiserfs_write_unlock_once(dir->i_sb, lock_depth);
	return retval;
}

static inline int reiserfs_empty_dir(struct inode *inode)
{
	/* we can cheat because an old format dir cannot have
	 ** EMPTY_DIR_SIZE, and a new format dir cannot have
	 ** EMPTY_DIR_SIZE_V1.  So, if the inode is either size,
	 ** regardless of disk format version, the directory is empty.
	 */
	if (inode->i_size != EMPTY_DIR_SIZE &&
	    inode->i_size != EMPTY_DIR_SIZE_V1) {
		return 0;
	}
	return 1;
}

static int reiserfs_rmdir(struct inode *dir, struct dentry *dentry)
{
	int retval, err;
	struct inode *inode;
	struct reiserfs_transaction_handle th;
	int jbegin_count;
	INITIALIZE_PATH(path);
	struct reiserfs_dir_entry de;

	/* we will be doing 2 balancings and update 2 stat data, we change quotas
	 * of the owner of the directory and of the owner of the parent directory.
	 * The quota structure is possibly deleted only on last iput => outside
	 * of this transaction */
	jbegin_count =
	    JOURNAL_PER_BALANCE_CNT * 2 + 2 +
	    4 * REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb);

	dquot_initialize(dir);

	reiserfs_write_lock(dir->i_sb);
	retval = journal_begin(&th, dir->i_sb, jbegin_count);
	if (retval)
		goto out_rmdir;

	de.de_gen_number_bit_string = NULL;
	if ((retval =
	     reiserfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len,
				 &path, &de)) == NAME_NOT_FOUND) {
		retval = -ENOENT;
		goto end_rmdir;
	} else if (retval == IO_ERROR) {
		retval = -EIO;
		goto end_rmdir;
	}

	inode = dentry->d_inode;

	reiserfs_update_inode_transaction(inode);
	reiserfs_update_inode_transaction(dir);

	if (de.de_objectid != inode->i_ino) {
		// FIXME: compare key of an object and a key found in the
		// entry
		retval = -EIO;
		goto end_rmdir;
	}
	if (!reiserfs_empty_dir(inode)) {
		retval = -ENOTEMPTY;
		goto end_rmdir;
	}

	/* cut entry from dir directory */
	retval = reiserfs_cut_from_item(&th, &path, &(de.de_entry_key), dir, NULL,	/* page */
					0 /*new file size - not used here */ );
	if (retval < 0)
		goto end_rmdir;

	if (inode->i_nlink != 2 && inode->i_nlink != 1)
		reiserfs_error(inode->i_sb, "reiserfs-7040",
			       "empty directory has nlink != 2 (%d)",
			       inode->i_nlink);

	clear_nlink(inode);
	inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
	reiserfs_update_sd(&th, inode);

	DEC_DIR_INODE_NLINK(dir)
	    dir->i_size -= (DEH_SIZE + de.de_entrylen);
	reiserfs_update_sd(&th, dir);

	/* prevent empty directory from getting lost */
	add_save_link(&th, inode, 0 /* not truncate */ );

	retval = journal_end(&th, dir->i_sb, jbegin_count);
	reiserfs_check_path(&path);
      out_rmdir:
	reiserfs_write_unlock(dir->i_sb);
	return retval;

      end_rmdir:
	/* we must release path, because we did not call
	   reiserfs_cut_from_item, or reiserfs_cut_from_item does not
	   release path if operation was not complete */
	pathrelse(&path);
	err = journal_end(&th, dir->i_sb, jbegin_count);
	reiserfs_write_unlock(dir->i_sb);
	return err ? err : retval;
}

static int reiserfs_unlink(struct inode *dir, struct dentry *dentry)
{
	int retval, err;
	struct inode *inode;
	struct reiserfs_dir_entry de;
	INITIALIZE_PATH(path);
	struct reiserfs_transaction_handle th;
	int jbegin_count;
	unsigned long savelink;
	int depth;

	dquot_initialize(dir);

	inode = dentry->d_inode;

	/* in this transaction we can be doing at max two balancings and update
	 * two stat datas, we change quotas of the owner of the directory and of
	 * the owner of the parent directory. The quota structure is possibly
	 * deleted only on iput => outside of this transaction */
	jbegin_count =
	    JOURNAL_PER_BALANCE_CNT * 2 + 2 +
	    4 * REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb);

	depth = reiserfs_write_lock_once(dir->i_sb);
	retval = journal_begin(&th, dir->i_sb, jbegin_count);
	if (retval)
		goto out_unlink;

	de.de_gen_number_bit_string = NULL;
	if ((retval =
	     reiserfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len,
				 &path, &de)) == NAME_NOT_FOUND) {
		retval = -ENOENT;
		goto end_unlink;
	} else if (retval == IO_ERROR) {
		retval = -EIO;
		goto end_unlink;
	}

	reiserfs_update_inode_transaction(inode);
	reiserfs_update_inode_transaction(dir);

	if (de.de_objectid != inode->i_ino) {
		// FIXME: compare key of an object and a key found in the
		// entry
		retval = -EIO;
		goto end_unlink;
	}

	if (!inode->i_nlink) {
		reiserfs_warning(inode->i_sb, "reiserfs-7042",
				 "deleting nonexistent file (%lu), %d",
				 inode->i_ino, inode->i_nlink);
		set_nlink(inode, 1);
	}

	drop_nlink(inode);

	/*
	 * we schedule before doing the add_save_link call, save the link
	 * count so we don't race
	 */
	savelink = inode->i_nlink;

	retval =
	    reiserfs_cut_from_item(&th, &path, &(de.de_entry_key), dir, NULL,
				   0);
	if (retval < 0) {
		inc_nlink(inode);
		goto end_unlink;
	}
	inode->i_ctime = CURRENT_TIME_SEC;
	reiserfs_update_sd(&th, inode);

	dir->i_size -= (de.de_entrylen + DEH_SIZE);
	dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
	reiserfs_update_sd(&th, dir);

	if (!savelink)
		/* prevent file from getting lost */
		add_save_link(&th, inode, 0 /* not truncate */ );

	retval = journal_end(&th, dir->i_sb, jbegin_count);
	reiserfs_check_path(&path);
	reiserfs_write_unlock_once(dir->i_sb, depth);
	return retval;

      end_unlink:
	pathrelse(&path);
	err = journal_end(&th, dir->i_sb, jbegin_count);
	reiserfs_check_path(&path);
	if (err)
		retval = err;
      out_unlink:
	reiserfs_write_unlock_once(dir->i_sb, depth);
	return retval;
}

static int reiserfs_symlink(struct inode *parent_dir,
			    struct dentry *dentry, const char *symname)
{
	int retval;
	struct inode *inode;
	char *name;
	int item_len;
	struct reiserfs_transaction_handle th;
	struct reiserfs_security_handle security;
	int mode = S_IFLNK | S_IRWXUGO;
	/* We need blocks for transaction + (user+group)*(quotas for new inode + update of quota for directory owner) */
	int jbegin_count =
	    JOURNAL_PER_BALANCE_CNT * 3 +
	    2 * (REISERFS_QUOTA_INIT_BLOCKS(parent_dir->i_sb) +
		 REISERFS_QUOTA_TRANS_BLOCKS(parent_dir->i_sb));

	dquot_initialize(parent_dir);

	if (!(inode = new_inode(parent_dir->i_sb))) {
		return -ENOMEM;
	}
	new_inode_init(inode, parent_dir, mode);

	retval = reiserfs_security_init(parent_dir, inode, &dentry->d_name,
					&security);
	if (retval < 0) {
		drop_new_inode(inode);
		return retval;
	}
	jbegin_count += retval;

	reiserfs_write_lock(parent_dir->i_sb);
	item_len = ROUND_UP(strlen(symname));
	if (item_len > MAX_DIRECT_ITEM_LEN(parent_dir->i_sb->s_blocksize)) {
		retval = -ENAMETOOLONG;
		drop_new_inode(inode);
		goto out_failed;
	}

	name = kmalloc(item_len, GFP_NOFS);
	if (!name) {
		drop_new_inode(inode);
		retval = -ENOMEM;
		goto out_failed;
	}
	memcpy(name, symname, strlen(symname));
	padd_item(name, item_len, strlen(symname));

	retval = journal_begin(&th, parent_dir->i_sb, jbegin_count);
	if (retval) {
		drop_new_inode(inode);
		kfree(name);
		goto out_failed;
	}

	retval =
	    reiserfs_new_inode(&th, parent_dir, mode, name, strlen(symname),
			       dentry, inode, &security);
	kfree(name);
	if (retval) {		/* reiserfs_new_inode iputs for us */
		goto out_failed;
	}

	reiserfs_update_inode_transaction(inode);
	reiserfs_update_inode_transaction(parent_dir);

	inode->i_op = &reiserfs_symlink_inode_operations;
	inode->i_mapping->a_ops = &reiserfs_address_space_operations;

	// must be sure this inode is written with this transaction
	//
	//reiserfs_update_sd (&th, inode, READ_BLOCKS);

	retval = reiserfs_add_entry(&th, parent_dir, dentry->d_name.name,
				    dentry->d_name.len, inode, 1 /*visible */ );
	if (retval) {
		int err;
		drop_nlink(inode);
		reiserfs_update_sd(&th, inode);
		err = journal_end(&th, parent_dir->i_sb, jbegin_count);
		if (err)
			retval = err;
		unlock_new_inode(inode);
		iput(inode);
		goto out_failed;
	}

	d_instantiate(dentry, inode);
	unlock_new_inode(inode);
	retval = journal_end(&th, parent_dir->i_sb, jbegin_count);
      out_failed:
	reiserfs_write_unlock(parent_dir->i_sb);
	return retval;
}

static int reiserfs_link(struct dentry *old_dentry, struct inode *dir,
			 struct dentry *dentry)
{
	int retval;
	struct inode *inode = old_dentry->d_inode;
	struct reiserfs_transaction_handle th;
	/* We need blocks for transaction + update of quotas for the owners of the directory */
	int jbegin_count =
	    JOURNAL_PER_BALANCE_CNT * 3 +
	    2 * REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb);

	dquot_initialize(dir);

	reiserfs_write_lock(dir->i_sb);
	if (inode->i_nlink >= REISERFS_LINK_MAX) {
		//FIXME: sd_nlink is 32 bit for new files
		reiserfs_write_unlock(dir->i_sb);
		return -EMLINK;
	}

	/* inc before scheduling so reiserfs_unlink knows we are here */
	inc_nlink(inode);

	retval = journal_begin(&th, dir->i_sb, jbegin_count);
	if (retval) {
		drop_nlink(inode);
		reiserfs_write_unlock(dir->i_sb);
		return retval;
	}

	/* create new entry */
	retval =
	    reiserfs_add_entry(&th, dir, dentry->d_name.name,
			       dentry->d_name.len, inode, 1 /*visible */ );

	reiserfs_update_inode_transaction(inode);
	reiserfs_update_inode_transaction(dir);

	if (retval) {
		int err;
		drop_nlink(inode);
		err = journal_end(&th, dir->i_sb, jbegin_count);
		reiserfs_write_unlock(dir->i_sb);
		return err ? err : retval;
	}

	inode->i_ctime = CURRENT_TIME_SEC;
	reiserfs_update_sd(&th, inode);

	ihold(inode);
	d_instantiate(dentry, inode);
	retval = journal_end(&th, dir->i_sb, jbegin_count);
	reiserfs_write_unlock(dir->i_sb);
	return retval;
}

/* de contains information pointing to an entry which */
static int de_still_valid(const char *name, int len,
			  struct reiserfs_dir_entry *de)
{
	struct reiserfs_dir_entry tmp = *de;

	// recalculate pointer to name and name length
	set_de_name_and_namelen(&tmp);
	// FIXME: could check more
	if (tmp.de_namelen != len || memcmp(name, de->de_name, len))
		return 0;
	return 1;
}

static int entry_points_to_object(const char *name, int len,
				  struct reiserfs_dir_entry *de,
				  struct inode *inode)
{
	if (!de_still_valid(name, len, de))
		return 0;

	if (inode) {
		if (!de_visible(de->de_deh + de->de_entry_num))
			reiserfs_panic(inode->i_sb, "vs-7042",
				       "entry must be visible");
		return (de->de_objectid == inode->i_ino) ? 1 : 0;
	}

	/* this must be added hidden entry */
	if (de_visible(de->de_deh + de->de_entry_num))
		reiserfs_panic(NULL, "vs-7043", "entry must be visible");

	return 1;
}

/* sets key of objectid the entry has to point to */
static void set_ino_in_dir_entry(struct reiserfs_dir_entry *de,
				 struct reiserfs_key *key)
{
	/* JDM These operations are endian safe - both are le */
	de->de_deh[de->de_entry_num].deh_dir_id = key->k_dir_id;
	de->de_deh[de->de_entry_num].deh_objectid = key->k_objectid;
}

/*
 * process, that is going to call fix_nodes/do_balance must hold only
 * one path. If it holds 2 or more, it can get into endless waiting in
 * get_empty_nodes or its clones
 */
static int reiserfs_rename(struct inode *old_dir, struct dentry *old_dentry,
			   struct inode *new_dir, struct dentry *new_dentry)
{
	int retval;
	INITIALIZE_PATH(old_entry_path);
	INITIALIZE_PATH(new_entry_path);
	INITIALIZE_PATH(dot_dot_entry_path);
	struct item_head new_entry_ih, old_entry_ih, dot_dot_ih;
	struct reiserfs_dir_entry old_de, new_de, dot_dot_de;
	struct inode *old_inode, *new_dentry_inode;
	struct reiserfs_transaction_handle th;
	int jbegin_count;
	umode_t old_inode_mode;
	unsigned long savelink = 1;
	struct timespec ctime;

	/* three balancings: (1) old name removal, (2) new name insertion
	   and (3) maybe "save" link insertion
	   stat data updates: (1) old directory,
	   (2) new directory and (3) maybe old object stat data (when it is
	   directory) and (4) maybe stat data of object to which new entry
	   pointed initially and (5) maybe block containing ".." of
	   renamed directory
	   quota updates: two parent directories */
	jbegin_count =
	    JOURNAL_PER_BALANCE_CNT * 3 + 5 +
	    4 * REISERFS_QUOTA_TRANS_BLOCKS(old_dir->i_sb);

	dquot_initialize(old_dir);
	dquot_initialize(new_dir);

	old_inode = old_dentry->d_inode;
	new_dentry_inode = new_dentry->d_inode;

	// make sure, that oldname still exists and points to an object we
	// are going to rename
	old_de.de_gen_number_bit_string = NULL;
	reiserfs_write_lock(old_dir->i_sb);
	retval =
	    reiserfs_find_entry(old_dir, old_dentry->d_name.name,
				old_dentry->d_name.len, &old_entry_path,
				&old_de);
	pathrelse(&old_entry_path);
	if (retval == IO_ERROR) {
		reiserfs_write_unlock(old_dir->i_sb);
		return -EIO;
	}

	if (retval != NAME_FOUND || old_de.de_objectid != old_inode->i_ino) {
		reiserfs_write_unlock(old_dir->i_sb);
		return -ENOENT;
	}

	old_inode_mode = old_inode->i_mode;
	if (S_ISDIR(old_inode_mode)) {
		// make sure, that directory being renamed has correct ".."
		// and that its new parent directory has not too many links
		// already

		if (new_dentry_inode) {
			if (!reiserfs_empty_dir(new_dentry_inode)) {
				reiserfs_write_unlock(old_dir->i_sb);
				return -ENOTEMPTY;
			}
		}

		/* directory is renamed, its parent directory will be changed,
		 ** so find ".." entry
		 */
		dot_dot_de.de_gen_number_bit_string = NULL;
		retval =
		    reiserfs_find_entry(old_inode, "..", 2, &dot_dot_entry_path,
					&dot_dot_de);
		pathrelse(&dot_dot_entry_path);
		if (retval != NAME_FOUND) {
			reiserfs_write_unlock(old_dir->i_sb);
			return -EIO;
		}

		/* inode number of .. must equal old_dir->i_ino */
		if (dot_dot_de.de_objectid != old_dir->i_ino) {
			reiserfs_write_unlock(old_dir->i_sb);
			return -EIO;
		}
	}

	retval = journal_begin(&th, old_dir->i_sb, jbegin_count);
	if (retval) {
		reiserfs_write_unlock(old_dir->i_sb);
		return retval;
	}

	/* add new entry (or find the existing one) */
	retval =
	    reiserfs_add_entry(&th, new_dir, new_dentry->d_name.name,
			       new_dentry->d_name.len, old_inode, 0);
	if (retval == -EEXIST) {
		if (!new_dentry_inode) {
			reiserfs_panic(old_dir->i_sb, "vs-7050",
				       "new entry is found, new inode == 0");
		}
	} else if (retval) {
		int err = journal_end(&th, old_dir->i_sb, jbegin_count);
		reiserfs_write_unlock(old_dir->i_sb);
		return err ? err : retval;
	}

	reiserfs_update_inode_transaction(old_dir);
	reiserfs_update_inode_transaction(new_dir);

	/* this makes it so an fsync on an open fd for the old name will
	 ** commit the rename operation
	 */
	reiserfs_update_inode_transaction(old_inode);

	if (new_dentry_inode)
		reiserfs_update_inode_transaction(new_dentry_inode);

	while (1) {
		// look for old name using corresponding entry key (found by reiserfs_find_entry)
		if ((retval =
		     search_by_entry_key(new_dir->i_sb, &old_de.de_entry_key,
					 &old_entry_path,
					 &old_de)) != NAME_FOUND) {
			pathrelse(&old_entry_path);
			journal_end(&th, old_dir->i_sb, jbegin_count);
			reiserfs_write_unlock(old_dir->i_sb);
			return -EIO;
		}

		copy_item_head(&old_entry_ih, get_ih(&old_entry_path));

		reiserfs_prepare_for_journal(old_inode->i_sb, old_de.de_bh, 1);

		// look for new name by reiserfs_find_entry
		new_de.de_gen_number_bit_string = NULL;
		retval =
		    reiserfs_find_entry(new_dir, new_dentry->d_name.name,
					new_dentry->d_name.len, &new_entry_path,
					&new_de);
		// reiserfs_add_entry should not return IO_ERROR, because it is called with essentially same parameters from
		// reiserfs_add_entry above, and we'll catch any i/o errors before we get here.
		if (retval != NAME_FOUND_INVISIBLE && retval != NAME_FOUND) {
			pathrelse(&new_entry_path);
			pathrelse(&old_entry_path);
			journal_end(&th, old_dir->i_sb, jbegin_count);
			reiserfs_write_unlock(old_dir->i_sb);
			return -EIO;
		}

		copy_item_head(&new_entry_ih, get_ih(&new_entry_path));

		reiserfs_prepare_for_journal(old_inode->i_sb, new_de.de_bh, 1);

		if (S_ISDIR(old_inode->i_mode)) {
			if ((retval =
			     search_by_entry_key(new_dir->i_sb,
						 &dot_dot_de.de_entry_key,
						 &dot_dot_entry_path,
						 &dot_dot_de)) != NAME_FOUND) {
				pathrelse(&dot_dot_entry_path);
				pathrelse(&new_entry_path);
				pathrelse(&old_entry_path);
				journal_end(&th, old_dir->i_sb, jbegin_count);
				reiserfs_write_unlock(old_dir->i_sb);
				return -EIO;
			}
			copy_item_head(&dot_dot_ih,
				       get_ih(&dot_dot_entry_path));
			// node containing ".." gets into transaction
			reiserfs_prepare_for_journal(old_inode->i_sb,
						     dot_dot_de.de_bh, 1);
		}
		/* we should check seals here, not do
		   this stuff, yes? Then, having
		   gathered everything into RAM we
		   should lock the buffers, yes?  -Hans */
		/* probably.  our rename needs to hold more
		 ** than one path at once.  The seals would
		 ** have to be written to deal with multi-path
		 ** issues -chris
		 */
		/* sanity checking before doing the rename - avoid races many
		 ** of the above checks could have scheduled.  We have to be
		 ** sure our items haven't been shifted by another process.
		 */
		if (item_moved(&new_entry_ih, &new_entry_path) ||
		    !entry_points_to_object(new_dentry->d_name.name,
					    new_dentry->d_name.len,
					    &new_de, new_dentry_inode) ||
		    item_moved(&old_entry_ih, &old_entry_path) ||
		    !entry_points_to_object(old_dentry->d_name.name,
					    old_dentry->d_name.len,
					    &old_de, old_inode)) {
			reiserfs_restore_prepared_buffer(old_inode->i_sb,
							 new_de.de_bh);
			reiserfs_restore_prepared_buffer(old_inode->i_sb,
							 old_de.de_bh);
			if (S_ISDIR(old_inode_mode))
				reiserfs_restore_prepared_buffer(old_inode->
								 i_sb,
								 dot_dot_de.
								 de_bh);
			continue;
		}
		if (S_ISDIR(old_inode_mode)) {
			if (item_moved(&dot_dot_ih, &dot_dot_entry_path) ||
			    !entry_points_to_object("..", 2, &dot_dot_de,
						    old_dir)) {
				reiserfs_restore_prepared_buffer(old_inode->
								 i_sb,
								 old_de.de_bh);
				reiserfs_restore_prepared_buffer(old_inode->
								 i_sb,
								 new_de.de_bh);
				reiserfs_restore_prepared_buffer(old_inode->
								 i_sb,
								 dot_dot_de.
								 de_bh);
				continue;
			}
		}

		RFALSE(S_ISDIR(old_inode_mode) &&
		       !buffer_journal_prepared(dot_dot_de.de_bh), "");

		break;
	}

	/* ok, all the changes can be done in one fell swoop when we
	   have claimed all the buffers needed. */

	mark_de_visible(new_de.de_deh + new_de.de_entry_num);
	set_ino_in_dir_entry(&new_de, INODE_PKEY(old_inode));
	journal_mark_dirty(&th, old_dir->i_sb, new_de.de_bh);

	mark_de_hidden(old_de.de_deh + old_de.de_entry_num);
	journal_mark_dirty(&th, old_dir->i_sb, old_de.de_bh);
	ctime = CURRENT_TIME_SEC;
	old_dir->i_ctime = old_dir->i_mtime = ctime;
	new_dir->i_ctime = new_dir->i_mtime = ctime;
	/* thanks to Alex Adriaanse <alex_a@caltech.edu> for patch which adds ctime update of
	   renamed object */
	old_inode->i_ctime = ctime;

	if (new_dentry_inode) {
		// adjust link number of the victim
		if (S_ISDIR(new_dentry_inode->i_mode)) {
			clear_nlink(new_dentry_inode);
		} else {
			drop_nlink(new_dentry_inode);
		}
		new_dentry_inode->i_ctime = ctime;
		savelink = new_dentry_inode->i_nlink;
	}

	if (S_ISDIR(old_inode_mode)) {
		/* adjust ".." of renamed directory */
		set_ino_in_dir_entry(&dot_dot_de, INODE_PKEY(new_dir));
		journal_mark_dirty(&th, new_dir->i_sb, dot_dot_de.de_bh);

		if (!new_dentry_inode)
			/* there (in new_dir) was no directory, so it got new link
			   (".."  of renamed directory) */
			INC_DIR_INODE_NLINK(new_dir);

		/* old directory lost one link - ".. " of renamed directory */
		DEC_DIR_INODE_NLINK(old_dir);
	}
	// looks like in 2.3.99pre3 brelse is atomic. so we can use pathrelse
	pathrelse(&new_entry_path);
	pathrelse(&dot_dot_entry_path);

	// FIXME: this reiserfs_cut_from_item's return value may screw up
	// anybody, but it will panic if will not be able to find the
	// entry. This needs one more clean up
	if (reiserfs_cut_from_item
	    (&th, &old_entry_path, &(old_de.de_entry_key), old_dir, NULL,
	     0) < 0)
		reiserfs_error(old_dir->i_sb, "vs-7060",
			       "couldn't not cut old name. Fsck later?");

	old_dir->i_size -= DEH_SIZE + old_de.de_entrylen;

	reiserfs_update_sd(&th, old_dir);
	reiserfs_update_sd(&th, new_dir);
	reiserfs_update_sd(&th, old_inode);

	if (new_dentry_inode) {
		if (savelink == 0)
			add_save_link(&th, new_dentry_inode,
				      0 /* not truncate */ );
		reiserfs_update_sd(&th, new_dentry_inode);
	}

	retval = journal_end(&th, old_dir->i_sb, jbegin_count);
	reiserfs_write_unlock(old_dir->i_sb);
	return retval;
}

/*
 * directories can handle most operations...
 */
const struct inode_operations reiserfs_dir_inode_operations = {
	//&reiserfs_dir_operations,   /* default_file_ops */
	.create = reiserfs_create,
	.lookup = reiserfs_lookup,
	.link = reiserfs_link,
	.unlink = reiserfs_unlink,
	.symlink = reiserfs_symlink,
	.mkdir = reiserfs_mkdir,
	.rmdir = reiserfs_rmdir,
	.mknod = reiserfs_mknod,
	.rename = reiserfs_rename,
	.setattr = reiserfs_setattr,
	.setxattr = reiserfs_setxattr,
	.getxattr = reiserfs_getxattr,
	.listxattr = reiserfs_listxattr,
	.removexattr = reiserfs_removexattr,
	.permission = reiserfs_permission,
	.get_acl = reiserfs_get_acl,
};

/*
 * symlink operations.. same as page_symlink_inode_operations, with xattr
 * stuff added
 */
const struct inode_operations reiserfs_symlink_inode_operations = {
	.readlink = generic_readlink,
	.follow_link = page_follow_link_light,
	.put_link = page_put_link,
	.setattr = reiserfs_setattr,
	.setxattr = reiserfs_setxattr,
	.getxattr = reiserfs_getxattr,
	.listxattr = reiserfs_listxattr,
	.removexattr = reiserfs_removexattr,
	.permission = reiserfs_permission,
	.get_acl = reiserfs_get_acl,

};

/*
 * special file operations.. just xattr/acl stuff
 */
const struct inode_operations reiserfs_special_inode_operations = {
	.setattr = reiserfs_setattr,
	.setxattr = reiserfs_setxattr,
	.getxattr = reiserfs_getxattr,
	.listxattr = reiserfs_listxattr,
	.removexattr = reiserfs_removexattr,
	.permission = reiserfs_permission,
	.get_acl = reiserfs_get_acl,
};
OpenPOWER on IntegriCloud