aboutsummaryrefslogtreecommitdiffstats
path: root/fs/afs/dir.c
blob: e26c901877ea641f1466ffe47d2c4da713be0b12 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
// SPDX-License-Identifier: GPL-2.0-or-later
/* dir.c: AFS filesystem directory handling
 *
 * Copyright (C) 2002, 2018 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 */

#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/namei.h>
#include <linux/pagemap.h>
#include <linux/swap.h>
#include <linux/ctype.h>
#include <linux/sched.h>
#include <linux/task_io_accounting_ops.h>
#include "internal.h"
#include "afs_fs.h"
#include "xdr_fs.h"

static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
				 unsigned int flags);
static int afs_dir_open(struct inode *inode, struct file *file);
static int afs_readdir(struct file *file, struct dir_context *ctx);
static int afs_d_revalidate(struct dentry *dentry, unsigned int flags);
static int afs_d_delete(const struct dentry *dentry);
static void afs_d_iput(struct dentry *dentry, struct inode *inode);
static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen,
				  loff_t fpos, u64 ino, unsigned dtype);
static int afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen,
			      loff_t fpos, u64 ino, unsigned dtype);
static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
		      bool excl);
static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode);
static int afs_rmdir(struct inode *dir, struct dentry *dentry);
static int afs_unlink(struct inode *dir, struct dentry *dentry);
static int afs_link(struct dentry *from, struct inode *dir,
		    struct dentry *dentry);
static int afs_symlink(struct inode *dir, struct dentry *dentry,
		       const char *content);
static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
		      struct inode *new_dir, struct dentry *new_dentry,
		      unsigned int flags);
static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags);
static void afs_dir_invalidatepage(struct page *page, unsigned int offset,
				   unsigned int length);

static int afs_dir_set_page_dirty(struct page *page)
{
	BUG(); /* This should never happen. */
}

const struct file_operations afs_dir_file_operations = {
	.open		= afs_dir_open,
	.release	= afs_release,
	.iterate_shared	= afs_readdir,
	.lock		= afs_lock,
	.llseek		= generic_file_llseek,
};

const struct inode_operations afs_dir_inode_operations = {
	.create		= afs_create,
	.lookup		= afs_lookup,
	.link		= afs_link,
	.unlink		= afs_unlink,
	.symlink	= afs_symlink,
	.mkdir		= afs_mkdir,
	.rmdir		= afs_rmdir,
	.rename		= afs_rename,
	.permission	= afs_permission,
	.getattr	= afs_getattr,
	.setattr	= afs_setattr,
	.listxattr	= afs_listxattr,
};

const struct address_space_operations afs_dir_aops = {
	.set_page_dirty	= afs_dir_set_page_dirty,
	.releasepage	= afs_dir_releasepage,
	.invalidatepage	= afs_dir_invalidatepage,
};

const struct dentry_operations afs_fs_dentry_operations = {
	.d_revalidate	= afs_d_revalidate,
	.d_delete	= afs_d_delete,
	.d_release	= afs_d_release,
	.d_automount	= afs_d_automount,
	.d_iput		= afs_d_iput,
};

struct afs_lookup_one_cookie {
	struct dir_context	ctx;
	struct qstr		name;
	bool			found;
	struct afs_fid		fid;
};

struct afs_lookup_cookie {
	struct dir_context	ctx;
	struct qstr		name;
	bool			found;
	bool			one_only;
	unsigned short		nr_fids;
	struct inode		**inodes;
	struct afs_status_cb	*statuses;
	struct afs_fid		fids[50];
};

/*
 * check that a directory page is valid
 */
static bool afs_dir_check_page(struct afs_vnode *dvnode, struct page *page,
			       loff_t i_size)
{
	struct afs_xdr_dir_page *dbuf;
	loff_t latter, off;
	int tmp, qty;

	/* Determine how many magic numbers there should be in this page, but
	 * we must take care because the directory may change size under us.
	 */
	off = page_offset(page);
	if (i_size <= off)
		goto checked;

	latter = i_size - off;
	if (latter >= PAGE_SIZE)
		qty = PAGE_SIZE;
	else
		qty = latter;
	qty /= sizeof(union afs_xdr_dir_block);

	/* check them */
	dbuf = kmap(page);
	for (tmp = 0; tmp < qty; tmp++) {
		if (dbuf->blocks[tmp].hdr.magic != AFS_DIR_MAGIC) {
			printk("kAFS: %s(%lx): bad magic %d/%d is %04hx\n",
			       __func__, dvnode->vfs_inode.i_ino, tmp, qty,
			       ntohs(dbuf->blocks[tmp].hdr.magic));
			trace_afs_dir_check_failed(dvnode, off, i_size);
			kunmap(page);
			trace_afs_file_error(dvnode, -EIO, afs_file_error_dir_bad_magic);
			goto error;
		}

		/* Make sure each block is NUL terminated so we can reasonably
		 * use string functions on it.  The filenames in the page
		 * *should* be NUL-terminated anyway.
		 */
		((u8 *)&dbuf->blocks[tmp])[AFS_DIR_BLOCK_SIZE - 1] = 0;
	}

	kunmap(page);

checked:
	afs_stat_v(dvnode, n_read_dir);
	return true;

error:
	return false;
}

/*
 * Check the contents of a directory that we've just read.
 */
static bool afs_dir_check_pages(struct afs_vnode *dvnode, struct afs_read *req)
{
	struct afs_xdr_dir_page *dbuf;
	unsigned int i, j, qty = PAGE_SIZE / sizeof(union afs_xdr_dir_block);

	for (i = 0; i < req->nr_pages; i++)
		if (!afs_dir_check_page(dvnode, req->pages[i], req->actual_len))
			goto bad;
	return true;

bad:
	pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx r=%llx\n",
		dvnode->fid.vid, dvnode->fid.vnode,
		req->file_size, req->len, req->actual_len, req->remain);
	pr_warn("DIR %llx %x %x %x\n",
		req->pos, req->index, req->nr_pages, req->offset);

	for (i = 0; i < req->nr_pages; i++) {
		dbuf = kmap(req->pages[i]);
		for (j = 0; j < qty; j++) {
			union afs_xdr_dir_block *block = &dbuf->blocks[j];

			pr_warn("[%02x] %32phN\n", i * qty + j, block);
		}
		kunmap(req->pages[i]);
	}
	return false;
}

/*
 * open an AFS directory file
 */
static int afs_dir_open(struct inode *inode, struct file *file)
{
	_enter("{%lu}", inode->i_ino);

	BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
	BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);

	if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags))
		return -ENOENT;

	return afs_open(inode, file);
}

/*
 * Read the directory into the pagecache in one go, scrubbing the previous
 * contents.  The list of pages is returned, pinning them so that they don't
 * get reclaimed during the iteration.
 */
static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key)
	__acquires(&dvnode->validate_lock)
{
	struct afs_read *req;
	loff_t i_size;
	int nr_pages, nr_inline, i, n;
	int ret = -ENOMEM;

retry:
	i_size = i_size_read(&dvnode->vfs_inode);
	if (i_size < 2048)
		return ERR_PTR(afs_bad(dvnode, afs_file_error_dir_small));
	if (i_size > 2048 * 1024) {
		trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big);
		return ERR_PTR(-EFBIG);
	}

	_enter("%llu", i_size);

	/* Get a request record to hold the page list.  We want to hold it
	 * inline if we can, but we don't want to make an order 1 allocation.
	 */
	nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE;
	nr_inline = nr_pages;
	if (nr_inline > (PAGE_SIZE - sizeof(*req)) / sizeof(struct page *))
		nr_inline = 0;

	req = kzalloc(sizeof(*req) + sizeof(struct page *) * nr_inline,
		      GFP_KERNEL);
	if (!req)
		return ERR_PTR(-ENOMEM);

	refcount_set(&req->usage, 1);
	req->nr_pages = nr_pages;
	req->actual_len = i_size; /* May change */
	req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */
	req->data_version = dvnode->status.data_version; /* May change */
	if (nr_inline > 0) {
		req->pages = req->array;
	} else {
		req->pages = kcalloc(nr_pages, sizeof(struct page *),
				     GFP_KERNEL);
		if (!req->pages)
			goto error;
	}

	/* Get a list of all the pages that hold or will hold the directory
	 * content.  We need to fill in any gaps that we might find where the
	 * memory reclaimer has been at work.  If there are any gaps, we will
	 * need to reread the entire directory contents.
	 */
	i = 0;
	do {
		n = find_get_pages_contig(dvnode->vfs_inode.i_mapping, i,
					  req->nr_pages - i,
					  req->pages + i);
		_debug("find %u at %u/%u", n, i, req->nr_pages);
		if (n == 0) {
			gfp_t gfp = dvnode->vfs_inode.i_mapping->gfp_mask;

			if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
				afs_stat_v(dvnode, n_inval);

			ret = -ENOMEM;
			req->pages[i] = __page_cache_alloc(gfp);
			if (!req->pages[i])
				goto error;
			ret = add_to_page_cache_lru(req->pages[i],
						    dvnode->vfs_inode.i_mapping,
						    i, gfp);
			if (ret < 0)
				goto error;

			set_page_private(req->pages[i], 1);
			SetPagePrivate(req->pages[i]);
			unlock_page(req->pages[i]);
			i++;
		} else {
			i += n;
		}
	} while (i < req->nr_pages);

	/* If we're going to reload, we need to lock all the pages to prevent
	 * races.
	 */
	ret = -ERESTARTSYS;
	if (down_read_killable(&dvnode->validate_lock) < 0)
		goto error;

	if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
		goto success;

	up_read(&dvnode->validate_lock);
	if (down_write_killable(&dvnode->validate_lock) < 0)
		goto error;

	if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
		trace_afs_reload_dir(dvnode);
		ret = afs_fetch_data(dvnode, key, req);
		if (ret < 0)
			goto error_unlock;

		task_io_account_read(PAGE_SIZE * req->nr_pages);

		if (req->len < req->file_size)
			goto content_has_grown;

		/* Validate the data we just read. */
		ret = -EIO;
		if (!afs_dir_check_pages(dvnode, req))
			goto error_unlock;

		// TODO: Trim excess pages

		set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags);
	}

	downgrade_write(&dvnode->validate_lock);
success:
	return req;

error_unlock:
	up_write(&dvnode->validate_lock);
error:
	afs_put_read(req);
	_leave(" = %d", ret);
	return ERR_PTR(ret);

content_has_grown:
	up_write(&dvnode->validate_lock);
	afs_put_read(req);
	goto retry;
}

/*
 * deal with one block in an AFS directory
 */
static int afs_dir_iterate_block(struct afs_vnode *dvnode,
				 struct dir_context *ctx,
				 union afs_xdr_dir_block *block,
				 unsigned blkoff)
{
	union afs_xdr_dirent *dire;
	unsigned offset, next, curr;
	size_t nlen;
	int tmp;

	_enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block);

	curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent);

	/* walk through the block, an entry at a time */
	for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS);
	     offset < AFS_DIR_SLOTS_PER_BLOCK;
	     offset = next
	     ) {
		next = offset + 1;

		/* skip entries marked unused in the bitmap */
		if (!(block->hdr.bitmap[offset / 8] &
		      (1 << (offset % 8)))) {
			_debug("ENT[%zu.%u]: unused",
			       blkoff / sizeof(union afs_xdr_dir_block), offset);
			if (offset >= curr)
				ctx->pos = blkoff +
					next * sizeof(union afs_xdr_dirent);
			continue;
		}

		/* got a valid entry */
		dire = &block->dirents[offset];
		nlen = strnlen(dire->u.name,
			       sizeof(*block) -
			       offset * sizeof(union afs_xdr_dirent));

		_debug("ENT[%zu.%u]: %s %zu \"%s\"",
		       blkoff / sizeof(union afs_xdr_dir_block), offset,
		       (offset < curr ? "skip" : "fill"),
		       nlen, dire->u.name);

		/* work out where the next possible entry is */
		for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_xdr_dirent)) {
			if (next >= AFS_DIR_SLOTS_PER_BLOCK) {
				_debug("ENT[%zu.%u]:"
				       " %u travelled beyond end dir block"
				       " (len %u/%zu)",
				       blkoff / sizeof(union afs_xdr_dir_block),
				       offset, next, tmp, nlen);
				return afs_bad(dvnode, afs_file_error_dir_over_end);
			}
			if (!(block->hdr.bitmap[next / 8] &
			      (1 << (next % 8)))) {
				_debug("ENT[%zu.%u]:"
				       " %u unmarked extension (len %u/%zu)",
				       blkoff / sizeof(union afs_xdr_dir_block),
				       offset, next, tmp, nlen);
				return afs_bad(dvnode, afs_file_error_dir_unmarked_ext);
			}

			_debug("ENT[%zu.%u]: ext %u/%zu",
			       blkoff / sizeof(union afs_xdr_dir_block),
			       next, tmp, nlen);
			next++;
		}

		/* skip if starts before the current position */
		if (offset < curr)
			continue;

		/* found the next entry */
		if (!dir_emit(ctx, dire->u.name, nlen,
			      ntohl(dire->u.vnode),
			      (ctx->actor == afs_lookup_filldir ||
			       ctx->actor == afs_lookup_one_filldir)?
			      ntohl(dire->u.unique) : DT_UNKNOWN)) {
			_leave(" = 0 [full]");
			return 0;
		}

		ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent);
	}

	_leave(" = 1 [more]");
	return 1;
}

/*
 * iterate through the data blob that lists the contents of an AFS directory
 */
static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx,
			   struct key *key, afs_dataversion_t *_dir_version)
{
	struct afs_vnode *dvnode = AFS_FS_I(dir);
	struct afs_xdr_dir_page *dbuf;
	union afs_xdr_dir_block *dblock;
	struct afs_read *req;
	struct page *page;
	unsigned blkoff, limit;
	int ret;

	_enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos);

	if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) {
		_leave(" = -ESTALE");
		return -ESTALE;
	}

	req = afs_read_dir(dvnode, key);
	if (IS_ERR(req))
		return PTR_ERR(req);
	*_dir_version = req->data_version;

	/* round the file position up to the next entry boundary */
	ctx->pos += sizeof(union afs_xdr_dirent) - 1;
	ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1);

	/* walk through the blocks in sequence */
	ret = 0;
	while (ctx->pos < req->actual_len) {
		blkoff = ctx->pos & ~(sizeof(union afs_xdr_dir_block) - 1);

		/* Fetch the appropriate page from the directory and re-add it
		 * to the LRU.
		 */
		page = req->pages[blkoff / PAGE_SIZE];
		if (!page) {
			ret = afs_bad(dvnode, afs_file_error_dir_missing_page);
			break;
		}
		mark_page_accessed(page);

		limit = blkoff & ~(PAGE_SIZE - 1);

		dbuf = kmap(page);

		/* deal with the individual blocks stashed on this page */
		do {
			dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) /
					       sizeof(union afs_xdr_dir_block)];
			ret = afs_dir_iterate_block(dvnode, ctx, dblock, blkoff);
			if (ret != 1) {
				kunmap(page);
				goto out;
			}

			blkoff += sizeof(union afs_xdr_dir_block);

		} while (ctx->pos < dir->i_size && blkoff < limit);

		kunmap(page);
		ret = 0;
	}

out:
	up_read(&dvnode->validate_lock);
	afs_put_read(req);
	_leave(" = %d", ret);
	return ret;
}

/*
 * read an AFS directory
 */
static int afs_readdir(struct file *file, struct dir_context *ctx)
{
	afs_dataversion_t dir_version;

	return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file),
			       &dir_version);
}

/*
 * Search the directory for a single name
 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
 *   uniquifier through dtype
 */
static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name,
				  int nlen, loff_t fpos, u64 ino, unsigned dtype)
{
	struct afs_lookup_one_cookie *cookie =
		container_of(ctx, struct afs_lookup_one_cookie, ctx);

	_enter("{%s,%u},%s,%u,,%llu,%u",
	       cookie->name.name, cookie->name.len, name, nlen,
	       (unsigned long long) ino, dtype);

	/* insanity checks first */
	BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
	BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);

	if (cookie->name.len != nlen ||
	    memcmp(cookie->name.name, name, nlen) != 0) {
		_leave(" = 0 [no]");
		return 0;
	}

	cookie->fid.vnode = ino;
	cookie->fid.unique = dtype;
	cookie->found = 1;

	_leave(" = -1 [found]");
	return -1;
}

/*
 * Do a lookup of a single name in a directory
 * - just returns the FID the dentry name maps to if found
 */
static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry,
			     struct afs_fid *fid, struct key *key,
			     afs_dataversion_t *_dir_version)
{
	struct afs_super_info *as = dir->i_sb->s_fs_info;
	struct afs_lookup_one_cookie cookie = {
		.ctx.actor = afs_lookup_one_filldir,
		.name = dentry->d_name,
		.fid.vid = as->volume->vid
	};
	int ret;

	_enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);

	/* search the directory */
	ret = afs_dir_iterate(dir, &cookie.ctx, key, _dir_version);
	if (ret < 0) {
		_leave(" = %d [iter]", ret);
		return ret;
	}

	ret = -ENOENT;
	if (!cookie.found) {
		_leave(" = -ENOENT [not found]");
		return -ENOENT;
	}

	*fid = cookie.fid;
	_leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique);
	return 0;
}

/*
 * search the directory for a name
 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
 *   uniquifier through dtype
 */
static int afs_lookup_filldir(struct dir_context *ctx, const char *name,
			      int nlen, loff_t fpos, u64 ino, unsigned dtype)
{
	struct afs_lookup_cookie *cookie =
		container_of(ctx, struct afs_lookup_cookie, ctx);
	int ret;

	_enter("{%s,%u},%s,%u,,%llu,%u",
	       cookie->name.name, cookie->name.len, name, nlen,
	       (unsigned long long) ino, dtype);

	/* insanity checks first */
	BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
	BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);

	if (cookie->found) {
		if (cookie->nr_fids < 50) {
			cookie->fids[cookie->nr_fids].vnode	= ino;
			cookie->fids[cookie->nr_fids].unique	= dtype;
			cookie->nr_fids++;
		}
	} else if (cookie->name.len == nlen &&
		   memcmp(cookie->name.name, name, nlen) == 0) {
		cookie->fids[0].vnode	= ino;
		cookie->fids[0].unique	= dtype;
		cookie->found = 1;
		if (cookie->one_only)
			return -1;
	}

	ret = cookie->nr_fids >= 50 ? -1 : 0;
	_leave(" = %d", ret);
	return ret;
}

/*
 * Do a lookup in a directory.  We make use of bulk lookup to query a slew of
 * files in one go and create inodes for them.  The inode of the file we were
 * asked for is returned.
 */
static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry,
				   struct key *key)
{
	struct afs_lookup_cookie *cookie;
	struct afs_cb_interest *dcbi, *cbi = NULL;
	struct afs_super_info *as = dir->i_sb->s_fs_info;
	struct afs_status_cb *scb;
	struct afs_iget_data iget_data;
	struct afs_fs_cursor fc;
	struct afs_server *server;
	struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode;
	struct inode *inode = NULL, *ti;
	afs_dataversion_t data_version = READ_ONCE(dvnode->status.data_version);
	int ret, i;

	_enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);

	cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL);
	if (!cookie)
		return ERR_PTR(-ENOMEM);

	cookie->ctx.actor = afs_lookup_filldir;
	cookie->name = dentry->d_name;
	cookie->nr_fids = 1; /* slot 0 is saved for the fid we actually want */

	read_seqlock_excl(&dvnode->cb_lock);
	dcbi = rcu_dereference_protected(dvnode->cb_interest,
					 lockdep_is_held(&dvnode->cb_lock.lock));
	if (dcbi) {
		server = dcbi->server;
		if (server &&
		    test_bit(AFS_SERVER_FL_NO_IBULK, &server->flags))
			cookie->one_only = true;
	}
	read_sequnlock_excl(&dvnode->cb_lock);

	for (i = 0; i < 50; i++)
		cookie->fids[i].vid = as->volume->vid;

	/* search the directory */
	ret = afs_dir_iterate(dir, &cookie->ctx, key, &data_version);
	if (ret < 0) {
		inode = ERR_PTR(ret);
		goto out;
	}

	dentry->d_fsdata = (void *)(unsigned long)data_version;

	inode = ERR_PTR(-ENOENT);
	if (!cookie->found)
		goto out;

	/* Check to see if we already have an inode for the primary fid. */
	iget_data.fid = cookie->fids[0];
	iget_data.volume = dvnode->volume;
	iget_data.cb_v_break = dvnode->volume->cb_v_break;
	iget_data.cb_s_break = 0;
	inode = ilookup5(dir->i_sb, cookie->fids[0].vnode,
			 afs_iget5_test, &iget_data);
	if (inode)
		goto out;

	/* Need space for examining all the selected files */
	inode = ERR_PTR(-ENOMEM);
	cookie->statuses = kvcalloc(cookie->nr_fids, sizeof(struct afs_status_cb),
				    GFP_KERNEL);
	if (!cookie->statuses)
		goto out;

	cookie->inodes = kcalloc(cookie->nr_fids, sizeof(struct inode *),
				 GFP_KERNEL);
	if (!cookie->inodes)
		goto out_s;

	for (i = 1; i < cookie->nr_fids; i++) {
		scb = &cookie->statuses[i];

		/* Find any inodes that already exist and get their
		 * callback counters.
		 */
		iget_data.fid = cookie->fids[i];
		ti = ilookup5_nowait(dir->i_sb, iget_data.fid.vnode,
				     afs_iget5_test, &iget_data);
		if (!IS_ERR_OR_NULL(ti)) {
			vnode = AFS_FS_I(ti);
			scb->cb_break = afs_calc_vnode_cb_break(vnode);
			cookie->inodes[i] = ti;
		}
	}

	/* Try FS.InlineBulkStatus first.  Abort codes for the individual
	 * lookups contained therein are stored in the reply without aborting
	 * the whole operation.
	 */
	if (cookie->one_only)
		goto no_inline_bulk_status;

	inode = ERR_PTR(-ERESTARTSYS);
	if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
		while (afs_select_fileserver(&fc)) {
			if (test_bit(AFS_SERVER_FL_NO_IBULK,
				      &fc.cbi->server->flags)) {
				fc.ac.abort_code = RX_INVALID_OPERATION;
				fc.ac.error = -ECONNABORTED;
				break;
			}
			iget_data.cb_v_break = dvnode->volume->cb_v_break;
			iget_data.cb_s_break = fc.cbi->server->cb_s_break;
			afs_fs_inline_bulk_status(&fc,
						  afs_v2net(dvnode),
						  cookie->fids,
						  cookie->statuses,
						  cookie->nr_fids, NULL);
		}

		if (fc.ac.error == 0)
			cbi = afs_get_cb_interest(fc.cbi);
		if (fc.ac.abort_code == RX_INVALID_OPERATION)
			set_bit(AFS_SERVER_FL_NO_IBULK, &fc.cbi->server->flags);
		inode = ERR_PTR(afs_end_vnode_operation(&fc));
	}

	if (!IS_ERR(inode))
		goto success;
	if (fc.ac.abort_code != RX_INVALID_OPERATION)
		goto out_c;

no_inline_bulk_status:
	/* We could try FS.BulkStatus next, but this aborts the entire op if
	 * any of the lookups fails - so, for the moment, revert to
	 * FS.FetchStatus for just the primary fid.
	 */
	inode = ERR_PTR(-ERESTARTSYS);
	if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
		while (afs_select_fileserver(&fc)) {
			iget_data.cb_v_break = dvnode->volume->cb_v_break;
			iget_data.cb_s_break = fc.cbi->server->cb_s_break;
			scb = &cookie->statuses[0];
			afs_fs_fetch_status(&fc,
					    afs_v2net(dvnode),
					    cookie->fids,
					    scb,
					    NULL);
		}

		if (fc.ac.error == 0)
			cbi = afs_get_cb_interest(fc.cbi);
		inode = ERR_PTR(afs_end_vnode_operation(&fc));
	}

	if (IS_ERR(inode))
		goto out_c;

success:
	/* Turn all the files into inodes and save the first one - which is the
	 * one we actually want.
	 */
	scb = &cookie->statuses[0];
	if (scb->status.abort_code != 0)
		inode = ERR_PTR(afs_abort_to_error(scb->status.abort_code));

	for (i = 0; i < cookie->nr_fids; i++) {
		struct afs_status_cb *scb = &cookie->statuses[i];

		if (!scb->have_status && !scb->have_error)
			continue;

		if (cookie->inodes[i]) {
			struct afs_vnode *iv = AFS_FS_I(cookie->inodes[i]);

			if (test_bit(AFS_VNODE_UNSET, &iv->flags))
				continue;

			afs_vnode_commit_status(&fc, iv,
						scb->cb_break, NULL, scb);
			continue;
		}

		if (scb->status.abort_code != 0)
			continue;

		iget_data.fid = cookie->fids[i];
		ti = afs_iget(dir->i_sb, key, &iget_data, scb, cbi, dvnode);
		if (!IS_ERR(ti))
			afs_cache_permit(AFS_FS_I(ti), key,
					 0 /* Assume vnode->cb_break is 0 */ +
					 iget_data.cb_v_break,
					 scb);
		if (i == 0) {
			inode = ti;
		} else {
			if (!IS_ERR(ti))
				iput(ti);
		}
	}

out_c:
	afs_put_cb_interest(afs_v2net(dvnode), cbi);
	if (cookie->inodes) {
		for (i = 0; i < cookie->nr_fids; i++)
			iput(cookie->inodes[i]);
		kfree(cookie->inodes);
	}
out_s:
	kvfree(cookie->statuses);
out:
	kfree(cookie);
	return inode;
}

/*
 * Look up an entry in a directory with @sys substitution.
 */
static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry,
				       struct key *key)
{
	struct afs_sysnames *subs;
	struct afs_net *net = afs_i2net(dir);
	struct dentry *ret;
	char *buf, *p, *name;
	int len, i;

	_enter("");

	ret = ERR_PTR(-ENOMEM);
	p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL);
	if (!buf)
		goto out_p;
	if (dentry->d_name.len > 4) {
		memcpy(p, dentry->d_name.name, dentry->d_name.len - 4);
		p += dentry->d_name.len - 4;
	}

	/* There is an ordered list of substitutes that we have to try. */
	read_lock(&net->sysnames_lock);
	subs = net->sysnames;
	refcount_inc(&subs->usage);
	read_unlock(&net->sysnames_lock);

	for (i = 0; i < subs->nr; i++) {
		name = subs->subs[i];
		len = dentry->d_name.len - 4 + strlen(name);
		if (len >= AFSNAMEMAX) {
			ret = ERR_PTR(-ENAMETOOLONG);
			goto out_s;
		}

		strcpy(p, name);
		ret = lookup_one_len(buf, dentry->d_parent, len);
		if (IS_ERR(ret) || d_is_positive(ret))
			goto out_s;
		dput(ret);
	}

	/* We don't want to d_add() the @sys dentry here as we don't want to
	 * the cached dentry to hide changes to the sysnames list.
	 */
	ret = NULL;
out_s:
	afs_put_sysnames(subs);
	kfree(buf);
out_p:
	key_put(key);
	return ret;
}

/*
 * look up an entry in a directory
 */
static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
				 unsigned int flags)
{
	struct afs_vnode *dvnode = AFS_FS_I(dir);
	struct inode *inode;
	struct dentry *d;
	struct key *key;
	int ret;

	_enter("{%llx:%llu},%p{%pd},",
	       dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry);

	ASSERTCMP(d_inode(dentry), ==, NULL);

	if (dentry->d_name.len >= AFSNAMEMAX) {
		_leave(" = -ENAMETOOLONG");
		return ERR_PTR(-ENAMETOOLONG);
	}

	if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) {
		_leave(" = -ESTALE");
		return ERR_PTR(-ESTALE);
	}

	key = afs_request_key(dvnode->volume->cell);
	if (IS_ERR(key)) {
		_leave(" = %ld [key]", PTR_ERR(key));
		return ERR_CAST(key);
	}

	ret = afs_validate(dvnode, key);
	if (ret < 0) {
		key_put(key);
		_leave(" = %d [val]", ret);
		return ERR_PTR(ret);
	}

	if (dentry->d_name.len >= 4 &&
	    dentry->d_name.name[dentry->d_name.len - 4] == '@' &&
	    dentry->d_name.name[dentry->d_name.len - 3] == 's' &&
	    dentry->d_name.name[dentry->d_name.len - 2] == 'y' &&
	    dentry->d_name.name[dentry->d_name.len - 1] == 's')
		return afs_lookup_atsys(dir, dentry, key);

	afs_stat_v(dvnode, n_lookup);
	inode = afs_do_lookup(dir, dentry, key);
	key_put(key);
	if (inode == ERR_PTR(-ENOENT)) {
		inode = afs_try_auto_mntpt(dentry, dir);
	} else {
		dentry->d_fsdata =
			(void *)(unsigned long)dvnode->status.data_version;
	}
	d = d_splice_alias(inode, dentry);
	if (!IS_ERR_OR_NULL(d)) {
		d->d_fsdata = dentry->d_fsdata;
		trace_afs_lookup(dvnode, &d->d_name,
				 inode ? AFS_FS_I(inode) : NULL);
	} else {
		trace_afs_lookup(dvnode, &dentry->d_name,
				 IS_ERR_OR_NULL(inode) ? NULL
				 : AFS_FS_I(inode));
	}
	return d;
}

/*
 * check that a dentry lookup hit has found a valid entry
 * - NOTE! the hit can be a negative hit too, so we can't assume we have an
 *   inode
 */
static int afs_d_revalidate(struct dentry *dentry, unsigned int flags)
{
	struct afs_vnode *vnode, *dir;
	struct afs_fid uninitialized_var(fid);
	struct dentry *parent;
	struct inode *inode;
	struct key *key;
	afs_dataversion_t dir_version;
	long de_version;
	int ret;

	if (flags & LOOKUP_RCU)
		return -ECHILD;

	if (d_really_is_positive(dentry)) {
		vnode = AFS_FS_I(d_inode(dentry));
		_enter("{v={%llx:%llu} n=%pd fl=%lx},",
		       vnode->fid.vid, vnode->fid.vnode, dentry,
		       vnode->flags);
	} else {
		_enter("{neg n=%pd}", dentry);
	}

	key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell);
	if (IS_ERR(key))
		key = NULL;

	if (d_really_is_positive(dentry)) {
		inode = d_inode(dentry);
		if (inode) {
			vnode = AFS_FS_I(inode);
			afs_validate(vnode, key);
			if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
				goto out_bad;
		}
	}

	/* lock down the parent dentry so we can peer at it */
	parent = dget_parent(dentry);
	dir = AFS_FS_I(d_inode(parent));

	/* validate the parent directory */
	afs_validate(dir, key);

	if (test_bit(AFS_VNODE_DELETED, &dir->flags)) {
		_debug("%pd: parent dir deleted", dentry);
		goto out_bad_parent;
	}

	/* We only need to invalidate a dentry if the server's copy changed
	 * behind our back.  If we made the change, it's no problem.  Note that
	 * on a 32-bit system, we only have 32 bits in the dentry to store the
	 * version.
	 */
	dir_version = dir->status.data_version;
	de_version = (long)dentry->d_fsdata;
	if (de_version == (long)dir_version)
		goto out_valid_noupdate;

	dir_version = dir->invalid_before;
	if (de_version - (long)dir_version >= 0)
		goto out_valid;

	_debug("dir modified");
	afs_stat_v(dir, n_reval);

	/* search the directory for this vnode */
	ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key, &dir_version);
	switch (ret) {
	case 0:
		/* the filename maps to something */
		if (d_really_is_negative(dentry))
			goto out_bad_parent;
		inode = d_inode(dentry);
		if (is_bad_inode(inode)) {
			printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n",
			       dentry);
			goto out_bad_parent;
		}

		vnode = AFS_FS_I(inode);

		/* if the vnode ID has changed, then the dirent points to a
		 * different file */
		if (fid.vnode != vnode->fid.vnode) {
			_debug("%pd: dirent changed [%llu != %llu]",
			       dentry, fid.vnode,
			       vnode->fid.vnode);
			goto not_found;
		}

		/* if the vnode ID uniqifier has changed, then the file has
		 * been deleted and replaced, and the original vnode ID has
		 * been reused */
		if (fid.unique != vnode->fid.unique) {
			_debug("%pd: file deleted (uq %u -> %u I:%u)",
			       dentry, fid.unique,
			       vnode->fid.unique,
			       vnode->vfs_inode.i_generation);
			write_seqlock(&vnode->cb_lock);
			set_bit(AFS_VNODE_DELETED, &vnode->flags);
			write_sequnlock(&vnode->cb_lock);
			goto not_found;
		}
		goto out_valid;

	case -ENOENT:
		/* the filename is unknown */
		_debug("%pd: dirent not found", dentry);
		if (d_really_is_positive(dentry))
			goto not_found;
		goto out_valid;

	default:
		_debug("failed to iterate dir %pd: %d",
		       parent, ret);
		goto out_bad_parent;
	}

out_valid:
	dentry->d_fsdata = (void *)(unsigned long)dir_version;
out_valid_noupdate:
	dput(parent);
	key_put(key);
	_leave(" = 1 [valid]");
	return 1;

	/* the dirent, if it exists, now points to a different vnode */
not_found:
	spin_lock(&dentry->d_lock);
	dentry->d_flags |= DCACHE_NFSFS_RENAMED;
	spin_unlock(&dentry->d_lock);

out_bad_parent:
	_debug("dropping dentry %pd2", dentry);
	dput(parent);
out_bad:
	key_put(key);

	_leave(" = 0 [bad]");
	return 0;
}

/*
 * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't
 * sleep)
 * - called from dput() when d_count is going to 0.
 * - return 1 to request dentry be unhashed, 0 otherwise
 */
static int afs_d_delete(const struct dentry *dentry)
{
	_enter("%pd", dentry);

	if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
		goto zap;

	if (d_really_is_positive(dentry) &&
	    (test_bit(AFS_VNODE_DELETED,   &AFS_FS_I(d_inode(dentry))->flags) ||
	     test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags)))
		goto zap;

	_leave(" = 0 [keep]");
	return 0;

zap:
	_leave(" = 1 [zap]");
	return 1;
}

/*
 * Clean up sillyrename files on dentry removal.
 */
static void afs_d_iput(struct dentry *dentry, struct inode *inode)
{
	if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
		afs_silly_iput(dentry, inode);
	iput(inode);
}

/*
 * handle dentry release
 */
void afs_d_release(struct dentry *dentry)
{
	_enter("%pd", dentry);
}

/*
 * Create a new inode for create/mkdir/symlink
 */
static void afs_vnode_new_inode(struct afs_fs_cursor *fc,
				struct dentry *new_dentry,
				struct afs_iget_data *new_data,
				struct afs_status_cb *new_scb)
{
	struct afs_vnode *vnode;
	struct inode *inode;

	if (fc->ac.error < 0)
		return;

	inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key,
			 new_data, new_scb, fc->cbi, fc->vnode);
	if (IS_ERR(inode)) {
		/* ENOMEM or EINTR at a really inconvenient time - just abandon
		 * the new directory on the server.
		 */
		fc->ac.error = PTR_ERR(inode);
		return;
	}

	vnode = AFS_FS_I(inode);
	set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags);
	if (fc->ac.error == 0)
		afs_cache_permit(vnode, fc->key, vnode->cb_break, new_scb);
	d_instantiate(new_dentry, inode);
}

static void afs_prep_for_new_inode(struct afs_fs_cursor *fc,
				   struct afs_iget_data *iget_data)
{
	iget_data->volume = fc->vnode->volume;
	iget_data->cb_v_break = fc->vnode->volume->cb_v_break;
	iget_data->cb_s_break = fc->cbi->server->cb_s_break;
}

/*
 * Note that a dentry got changed.  We need to set d_fsdata to the data version
 * number derived from the result of the operation.  It doesn't matter if
 * d_fsdata goes backwards as we'll just revalidate.
 */
static void afs_update_dentry_version(struct afs_fs_cursor *fc,
				      struct dentry *dentry,
				      struct afs_status_cb *scb)
{
	if (fc->ac.error == 0)
		dentry->d_fsdata =
			(void *)(unsigned long)scb->status.data_version;
}

/*
 * create a directory on an AFS filesystem
 */
static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
	struct afs_iget_data iget_data;
	struct afs_status_cb *scb;
	struct afs_fs_cursor fc;
	struct afs_vnode *dvnode = AFS_FS_I(dir);
	struct key *key;
	int ret;

	mode |= S_IFDIR;

	_enter("{%llx:%llu},{%pd},%ho",
	       dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);

	ret = -ENOMEM;
	scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL);
	if (!scb)
		goto error;

	key = afs_request_key(dvnode->volume->cell);
	if (IS_ERR(key)) {
		ret = PTR_ERR(key);
		goto error_scb;
	}

	ret = -ERESTARTSYS;
	if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
		afs_dataversion_t data_version = dvnode->status.data_version + 1;

		while (afs_select_fileserver(&fc)) {
			fc.cb_break = afs_calc_vnode_cb_break(dvnode);
			afs_prep_for_new_inode(&fc, &iget_data);
			afs_fs_create(&fc, dentry->d_name.name, mode,
				      &scb[0], &iget_data.fid, &scb[1]);
		}

		afs_check_for_remote_deletion(&fc, dvnode);
		afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
					&data_version, &scb[0]);
		afs_update_dentry_version(&fc, dentry, &scb[0]);
		afs_vnode_new_inode(&fc, dentry, &iget_data, &scb[1]);
		ret = afs_end_vnode_operation(&fc);
		if (ret < 0)
			goto error_key;
	} else {
		goto error_key;
	}

	if (ret == 0 &&
	    test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
		afs_edit_dir_add(dvnode, &dentry->d_name, &iget_data.fid,
				 afs_edit_dir_for_create);

	key_put(key);
	kfree(scb);
	_leave(" = 0");
	return 0;

error_key:
	key_put(key);
error_scb:
	kfree(scb);
error:
	d_drop(dentry);
	_leave(" = %d", ret);
	return ret;
}

/*
 * Remove a subdir from a directory.
 */
static void afs_dir_remove_subdir(struct dentry *dentry)
{
	if (d_really_is_positive(dentry)) {
		struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));

		clear_nlink(&vnode->vfs_inode);
		set_bit(AFS_VNODE_DELETED, &vnode->flags);
		clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
		clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
	}
}

/*
 * remove a directory from an AFS filesystem
 */
static int afs_rmdir(struct inode *dir, struct dentry *dentry)
{
	struct afs_status_cb *scb;
	struct afs_fs_cursor fc;
	struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL;
	struct key *key;
	int ret;

	_enter("{%llx:%llu},{%pd}",
	       dvnode->fid.vid, dvnode->fid.vnode, dentry);

	scb = kzalloc(sizeof(struct afs_status_cb), GFP_KERNEL);
	if (!scb)
		return -ENOMEM;

	key = afs_request_key(dvnode->volume->cell);
	if (IS_ERR(key)) {
		ret = PTR_ERR(key);
		goto error;
	}

	/* Try to make sure we have a callback promise on the victim. */
	if (d_really_is_positive(dentry)) {
		vnode = AFS_FS_I(d_inode(dentry));
		ret = afs_validate(vnode, key);
		if (ret < 0)
			goto error_key;
	}

	if (vnode) {
		ret = down_write_killable(&vnode->rmdir_lock);
		if (ret < 0)
			goto error_key;
	}

	ret = -ERESTARTSYS;
	if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
		afs_dataversion_t data_version = dvnode->status.data_version + 1;

		while (afs_select_fileserver(&fc)) {
			fc.cb_break = afs_calc_vnode_cb_break(dvnode);
			afs_fs_remove(&fc, vnode, dentry->d_name.name, true, scb);
		}

		afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
					&data_version, scb);
		afs_update_dentry_version(&fc, dentry, scb);
		ret = afs_end_vnode_operation(&fc);
		if (ret == 0) {
			afs_dir_remove_subdir(dentry);
			if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
				afs_edit_dir_remove(dvnode, &dentry->d_name,
						    afs_edit_dir_for_rmdir);
		}
	}

	if (vnode)
		up_write(&vnode->rmdir_lock);
error_key:
	key_put(key);
error:
	kfree(scb);
	return ret;
}

/*
 * Remove a link to a file or symlink from a directory.
 *
 * If the file was not deleted due to excess hard links, the fileserver will
 * break the callback promise on the file - if it had one - before it returns
 * to us, and if it was deleted, it won't
 *
 * However, if we didn't have a callback promise outstanding, or it was
 * outstanding on a different server, then it won't break it either...
 */
static int afs_dir_remove_link(struct afs_vnode *dvnode, struct dentry *dentry,
			       struct key *key)
{
	int ret = 0;

	if (d_really_is_positive(dentry)) {
		struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));

		if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
			/* Already done */
		} else if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
			write_seqlock(&vnode->cb_lock);
			drop_nlink(&vnode->vfs_inode);
			if (vnode->vfs_inode.i_nlink == 0) {
				set_bit(AFS_VNODE_DELETED, &vnode->flags);
				__afs_break_callback(vnode);
			}
			write_sequnlock(&vnode->cb_lock);
			ret = 0;
		} else {
			afs_break_callback(vnode);

			if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
				kdebug("AFS_VNODE_DELETED");

			ret = afs_validate(vnode, key);
			if (ret == -ESTALE)
				ret = 0;
		}
		_debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret);
	}

	return ret;
}

/*
 * Remove a file or symlink from an AFS filesystem.
 */
static int afs_unlink(struct inode *dir, struct dentry *dentry)
{
	struct afs_fs_cursor fc;
	struct afs_status_cb *scb;
	struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL;
	struct key *key;
	bool need_rehash = false;
	int ret;

	_enter("{%llx:%llu},{%pd}",
	       dvnode->fid.vid, dvnode->fid.vnode, dentry);

	if (dentry->d_name.len >= AFSNAMEMAX)
		return -ENAMETOOLONG;

	ret = -ENOMEM;
	scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL);
	if (!scb)
		goto error;

	key = afs_request_key(dvnode->volume->cell);
	if (IS_ERR(key)) {
		ret = PTR_ERR(key);
		goto error_scb;
	}

	/* Try to make sure we have a callback promise on the victim. */
	if (d_really_is_positive(dentry)) {
		vnode = AFS_FS_I(d_inode(dentry));
		ret = afs_validate(vnode, key);
		if (ret < 0)
			goto error_key;
	}

	spin_lock(&dentry->d_lock);
	if (vnode && d_count(dentry) > 1) {
		spin_unlock(&dentry->d_lock);
		/* Start asynchronous writeout of the inode */
		write_inode_now(d_inode(dentry), 0);
		ret = afs_sillyrename(dvnode, vnode, dentry, key);
		goto error_key;
	}
	if (!d_unhashed(dentry)) {
		/* Prevent a race with RCU lookup. */
		__d_drop(dentry);
		need_rehash = true;
	}
	spin_unlock(&dentry->d_lock);

	ret = -ERESTARTSYS;
	if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
		afs_dataversion_t data_version = dvnode->status.data_version + 1;
		afs_dataversion_t data_version_2 = vnode->status.data_version;

		while (afs_select_fileserver(&fc)) {
			fc.cb_break = afs_calc_vnode_cb_break(dvnode);
			fc.cb_break_2 = afs_calc_vnode_cb_break(vnode);

			if (test_bit(AFS_SERVER_FL_IS_YFS, &fc.cbi->server->flags) &&
			    !test_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags)) {
				yfs_fs_remove_file2(&fc, vnode, dentry->d_name.name,
						    &scb[0], &scb[1]);
				if (fc.ac.error != -ECONNABORTED ||
				    fc.ac.abort_code != RXGEN_OPCODE)
					continue;
				set_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags);
			}

			afs_fs_remove(&fc, vnode, dentry->d_name.name, false, &scb[0]);
		}

		afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
					&data_version, &scb[0]);
		afs_vnode_commit_status(&fc, vnode, fc.cb_break_2,
					&data_version_2, &scb[1]);
		afs_update_dentry_version(&fc, dentry, &scb[0]);
		ret = afs_end_vnode_operation(&fc);
		if (ret == 0 && !(scb[1].have_status || scb[1].have_error))
			ret = afs_dir_remove_link(dvnode, dentry, key);
		if (ret == 0 &&
		    test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
			afs_edit_dir_remove(dvnode, &dentry->d_name,
					    afs_edit_dir_for_unlink);
	}

	if (need_rehash && ret < 0 && ret != -ENOENT)
		d_rehash(dentry);

error_key:
	key_put(key);
error_scb:
	kfree(scb);
error:
	_leave(" = %d", ret);
	return ret;
}

/*
 * create a regular file on an AFS filesystem
 */
static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
		      bool excl)
{
	struct afs_iget_data iget_data;
	struct afs_fs_cursor fc;
	struct afs_status_cb *scb;
	struct afs_vnode *dvnode = AFS_FS_I(dir);
	struct key *key;
	int ret;

	mode |= S_IFREG;

	_enter("{%llx:%llu},{%pd},%ho,",
	       dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);

	ret = -ENAMETOOLONG;
	if (dentry->d_name.len >= AFSNAMEMAX)
		goto error;

	key = afs_request_key(dvnode->volume->cell);
	if (IS_ERR(key)) {
		ret = PTR_ERR(key);
		goto error;
	}

	ret = -ENOMEM;
	scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL);
	if (!scb)
		goto error_scb;

	ret = -ERESTARTSYS;
	if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
		afs_dataversion_t data_version = dvnode->status.data_version + 1;

		while (afs_select_fileserver(&fc)) {
			fc.cb_break = afs_calc_vnode_cb_break(dvnode);
			afs_prep_for_new_inode(&fc, &iget_data);
			afs_fs_create(&fc, dentry->d_name.name, mode,
				      &scb[0], &iget_data.fid, &scb[1]);
		}

		afs_check_for_remote_deletion(&fc, dvnode);
		afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
					&data_version, &scb[0]);
		afs_update_dentry_version(&fc, dentry, &scb[0]);
		afs_vnode_new_inode(&fc, dentry, &iget_data, &scb[1]);
		ret = afs_end_vnode_operation(&fc);
		if (ret < 0)
			goto error_key;
	} else {
		goto error_key;
	}

	if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
		afs_edit_dir_add(dvnode, &dentry->d_name, &iget_data.fid,
				 afs_edit_dir_for_create);

	kfree(scb);
	key_put(key);
	_leave(" = 0");
	return 0;

error_scb:
	kfree(scb);
error_key:
	key_put(key);
error:
	d_drop(dentry);
	_leave(" = %d", ret);
	return ret;
}

/*
 * create a hard link between files in an AFS filesystem
 */
static int afs_link(struct dentry *from, struct inode *dir,
		    struct dentry *dentry)
{
	struct afs_fs_cursor fc;
	struct afs_status_cb *scb;
	struct afs_vnode *dvnode = AFS_FS_I(dir);
	struct afs_vnode *vnode = AFS_FS_I(d_inode(from));
	struct key *key;
	int ret;

	_enter("{%llx:%llu},{%llx:%llu},{%pd}",
	       vnode->fid.vid, vnode->fid.vnode,
	       dvnode->fid.vid, dvnode->fid.vnode,
	       dentry);

	ret = -ENAMETOOLONG;
	if (dentry->d_name.len >= AFSNAMEMAX)
		goto error;

	ret = -ENOMEM;
	scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL);
	if (!scb)
		goto error;

	key = afs_request_key(dvnode->volume->cell);
	if (IS_ERR(key)) {
		ret = PTR_ERR(key);
		goto error_scb;
	}

	ret = -ERESTARTSYS;
	if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
		afs_dataversion_t data_version = dvnode->status.data_version + 1;

		if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) {
			afs_end_vnode_operation(&fc);
			goto error_key;
		}

		while (afs_select_fileserver(&fc)) {
			fc.cb_break = afs_calc_vnode_cb_break(dvnode);
			fc.cb_break_2 = afs_calc_vnode_cb_break(vnode);
			afs_fs_link(&fc, vnode, dentry->d_name.name,
				    &scb[0], &scb[1]);
		}

		afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
					&data_version, &scb[0]);
		afs_vnode_commit_status(&fc, vnode, fc.cb_break_2,
					NULL, &scb[1]);
		ihold(&vnode->vfs_inode);
		afs_update_dentry_version(&fc, dentry, &scb[0]);
		d_instantiate(dentry, &vnode->vfs_inode);

		mutex_unlock(&vnode->io_lock);
		ret = afs_end_vnode_operation(&fc);
		if (ret < 0)
			goto error_key;
	} else {
		goto error_key;
	}

	if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
		afs_edit_dir_add(dvnode, &dentry->d_name, &vnode->fid,
				 afs_edit_dir_for_link);

	key_put(key);
	kfree(scb);
	_leave(" = 0");
	return 0;

error_key:
	key_put(key);
error_scb:
	kfree(scb);
error:
	d_drop(dentry);
	_leave(" = %d", ret);
	return ret;
}

/*
 * create a symlink in an AFS filesystem
 */
static int afs_symlink(struct inode *dir, struct dentry *dentry,
		       const char *content)
{
	struct afs_iget_data iget_data;
	struct afs_fs_cursor fc;
	struct afs_status_cb *scb;
	struct afs_vnode *dvnode = AFS_FS_I(dir);
	struct key *key;
	int ret;

	_enter("{%llx:%llu},{%pd},%s",
	       dvnode->fid.vid, dvnode->fid.vnode, dentry,
	       content);

	ret = -ENAMETOOLONG;
	if (dentry->d_name.len >= AFSNAMEMAX)
		goto error;

	ret = -EINVAL;
	if (strlen(content) >= AFSPATHMAX)
		goto error;

	ret = -ENOMEM;
	scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL);
	if (!scb)
		goto error;

	key = afs_request_key(dvnode->volume->cell);
	if (IS_ERR(key)) {
		ret = PTR_ERR(key);
		goto error_scb;
	}

	ret = -ERESTARTSYS;
	if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
		afs_dataversion_t data_version = dvnode->status.data_version + 1;

		while (afs_select_fileserver(&fc)) {
			fc.cb_break = afs_calc_vnode_cb_break(dvnode);
			afs_prep_for_new_inode(&fc, &iget_data);
			afs_fs_symlink(&fc, dentry->d_name.name, content,
				       &scb[0], &iget_data.fid, &scb[1]);
		}

		afs_check_for_remote_deletion(&fc, dvnode);
		afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
					&data_version, &scb[0]);
		afs_update_dentry_version(&fc, dentry, &scb[0]);
		afs_vnode_new_inode(&fc, dentry, &iget_data, &scb[1]);
		ret = afs_end_vnode_operation(&fc);
		if (ret < 0)
			goto error_key;
	} else {
		goto error_key;
	}

	if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
		afs_edit_dir_add(dvnode, &dentry->d_name, &iget_data.fid,
				 afs_edit_dir_for_symlink);

	key_put(key);
	kfree(scb);
	_leave(" = 0");
	return 0;

error_key:
	key_put(key);
error_scb:
	kfree(scb);
error:
	d_drop(dentry);
	_leave(" = %d", ret);
	return ret;
}

/*
 * rename a file in an AFS filesystem and/or move it between directories
 */
static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
		      struct inode *new_dir, struct dentry *new_dentry,
		      unsigned int flags)
{
	struct afs_fs_cursor fc;
	struct afs_status_cb *scb;
	struct afs_vnode *orig_dvnode, *new_dvnode, *vnode;
	struct dentry *tmp = NULL, *rehash = NULL;
	struct inode *new_inode;
	struct key *key;
	bool new_negative = d_is_negative(new_dentry);
	int ret;

	if (flags)
		return -EINVAL;

	/* Don't allow silly-rename files be moved around. */
	if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED)
		return -EINVAL;

	vnode = AFS_FS_I(d_inode(old_dentry));
	orig_dvnode = AFS_FS_I(old_dir);
	new_dvnode = AFS_FS_I(new_dir);

	_enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}",
	       orig_dvnode->fid.vid, orig_dvnode->fid.vnode,
	       vnode->fid.vid, vnode->fid.vnode,
	       new_dvnode->fid.vid, new_dvnode->fid.vnode,
	       new_dentry);

	ret = -ENOMEM;
	scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL);
	if (!scb)
		goto error;

	key = afs_request_key(orig_dvnode->volume->cell);
	if (IS_ERR(key)) {
		ret = PTR_ERR(key);
		goto error_scb;
	}

	/* For non-directories, check whether the target is busy and if so,
	 * make a copy of the dentry and then do a silly-rename.  If the
	 * silly-rename succeeds, the copied dentry is hashed and becomes the
	 * new target.
	 */
	if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) {
		/* To prevent any new references to the target during the
		 * rename, we unhash the dentry in advance.
		 */
		if (!d_unhashed(new_dentry)) {
			d_drop(new_dentry);
			rehash = new_dentry;
		}

		if (d_count(new_dentry) > 2) {
			/* copy the target dentry's name */
			ret = -ENOMEM;
			tmp = d_alloc(new_dentry->d_parent,
				      &new_dentry->d_name);
			if (!tmp)
				goto error_rehash;

			ret = afs_sillyrename(new_dvnode,
					      AFS_FS_I(d_inode(new_dentry)),
					      new_dentry, key);
			if (ret)
				goto error_rehash;

			new_dentry = tmp;
			rehash = NULL;
			new_negative = true;
		}
	}

	/* This bit is potentially nasty as there's a potential race with
	 * afs_d_revalidate{,_rcu}().  We have to change d_fsdata on the dentry
	 * to reflect it's new parent's new data_version after the op, but
	 * d_revalidate may see old_dentry between the op having taken place
	 * and the version being updated.
	 *
	 * So drop the old_dentry for now to make other threads go through
	 * lookup instead - which we hold a lock against.
	 */
	d_drop(old_dentry);

	ret = -ERESTARTSYS;
	if (afs_begin_vnode_operation(&fc, orig_dvnode, key, true)) {
		afs_dataversion_t orig_data_version;
		afs_dataversion_t new_data_version;
		struct afs_status_cb *new_scb = &scb[1];

		orig_data_version = orig_dvnode->status.data_version + 1;

		if (orig_dvnode != new_dvnode) {
			if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) {
				afs_end_vnode_operation(&fc);
				goto error_rehash_old;
			}
			new_data_version = new_dvnode->status.data_version + 1;
		} else {
			new_data_version = orig_data_version;
			new_scb = &scb[0];
		}

		while (afs_select_fileserver(&fc)) {
			fc.cb_break = afs_calc_vnode_cb_break(orig_dvnode);
			fc.cb_break_2 = afs_calc_vnode_cb_break(new_dvnode);
			afs_fs_rename(&fc, old_dentry->d_name.name,
				      new_dvnode, new_dentry->d_name.name,
				      &scb[0], new_scb);
		}

		afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break,
					&orig_data_version, &scb[0]);
		if (new_dvnode != orig_dvnode) {
			afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2,
						&new_data_version, &scb[1]);
			mutex_unlock(&new_dvnode->io_lock);
		}
		ret = afs_end_vnode_operation(&fc);
		if (ret < 0)
			goto error_rehash_old;
	}

	if (ret == 0) {
		if (rehash)
			d_rehash(rehash);
		if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags))
		    afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name,
					afs_edit_dir_for_rename_0);

		if (!new_negative &&
		    test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags))
			afs_edit_dir_remove(new_dvnode, &new_dentry->d_name,
					    afs_edit_dir_for_rename_1);

		if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags))
			afs_edit_dir_add(new_dvnode, &new_dentry->d_name,
					 &vnode->fid, afs_edit_dir_for_rename_2);

		new_inode = d_inode(new_dentry);
		if (new_inode) {
			spin_lock(&new_inode->i_lock);
			if (new_inode->i_nlink > 0)
				drop_nlink(new_inode);
			spin_unlock(&new_inode->i_lock);
		}

		/* Now we can update d_fsdata on the dentries to reflect their
		 * new parent's data_version.
		 *
		 * Note that if we ever implement RENAME_EXCHANGE, we'll have
		 * to update both dentries with opposing dir versions.
		 */
		if (new_dvnode != orig_dvnode) {
			afs_update_dentry_version(&fc, old_dentry, &scb[1]);
			afs_update_dentry_version(&fc, new_dentry, &scb[1]);
		} else {
			afs_update_dentry_version(&fc, old_dentry, &scb[0]);
			afs_update_dentry_version(&fc, new_dentry, &scb[0]);
		}
		d_move(old_dentry, new_dentry);
		goto error_tmp;
	}

error_rehash_old:
	d_rehash(new_dentry);
error_rehash:
	if (rehash)
		d_rehash(rehash);
error_tmp:
	if (tmp)
		dput(tmp);
	key_put(key);
error_scb:
	kfree(scb);
error:
	_leave(" = %d", ret);
	return ret;
}

/*
 * Release a directory page and clean up its private state if it's not busy
 * - return true if the page can now be released, false if not
 */
static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags)
{
	struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host);

	_enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index);

	set_page_private(page, 0);
	ClearPagePrivate(page);

	/* The directory will need reloading. */
	if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
		afs_stat_v(dvnode, n_relpg);
	return 1;
}

/*
 * invalidate part or all of a page
 * - release a page and clean up its private data if offset is 0 (indicating
 *   the entire page)
 */
static void afs_dir_invalidatepage(struct page *page, unsigned int offset,
				   unsigned int length)
{
	struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host);

	_enter("{%lu},%u,%u", page->index, offset, length);

	BUG_ON(!PageLocked(page));

	/* The directory will need reloading. */
	if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
		afs_stat_v(dvnode, n_inval);

	/* we clean up only if the entire page is being invalidated */
	if (offset == 0 && length == PAGE_SIZE) {
		set_page_private(page, 0);
		ClearPagePrivate(page);
	}
}