summaryrefslogtreecommitdiffstats
path: root/fs/smb/server/vfs.c
blob: a4c99ec38faca61decd79ac91eb54eb7a22f2698 (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *   Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org>
 *   Copyright (C) 2018 Samsung Electronics Co., Ltd.
 */

#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/backing-dev.h>
#include <linux/writeback.h>
#include <linux/xattr.h>
#include <linux/falloc.h>
#include <linux/fsnotify.h>
#include <linux/dcache.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/sched/xacct.h>
#include <linux/crc32c.h>
#include <linux/namei.h>

#include "../../internal.h"	/* for vfs_path_lookup */

#include "glob.h"
#include "oplock.h"
#include "connection.h"
#include "vfs.h"
#include "vfs_cache.h"
#include "smbacl.h"
#include "ndr.h"
#include "auth.h"
#include "misc.h"

#include "smb_common.h"
#include "mgmt/share_config.h"
#include "mgmt/tree_connect.h"
#include "mgmt/user_session.h"
#include "mgmt/user_config.h"

static void ksmbd_vfs_inherit_owner(struct ksmbd_work *work,
				    struct inode *parent_inode,
				    struct inode *inode)
{
	if (!test_share_config_flag(work->tcon->share_conf,
				    KSMBD_SHARE_FLAG_INHERIT_OWNER))
		return;

	i_uid_write(inode, i_uid_read(parent_inode));
}

/**
 * ksmbd_vfs_lock_parent() - lock parent dentry if it is stable
 */
int ksmbd_vfs_lock_parent(struct dentry *parent, struct dentry *child)
{
	inode_lock_nested(d_inode(parent), I_MUTEX_PARENT);
	if (child->d_parent != parent) {
		inode_unlock(d_inode(parent));
		return -ENOENT;
	}

	return 0;
}

static int ksmbd_vfs_path_lookup_locked(struct ksmbd_share_config *share_conf,
					char *pathname, unsigned int flags,
					struct path *parent_path,
					struct path *path)
{
	struct qstr last;
	struct filename *filename;
	struct path *root_share_path = &share_conf->vfs_path;
	int err, type;
	struct dentry *d;

	if (pathname[0] == '\0') {
		pathname = share_conf->path;
		root_share_path = NULL;
	} else {
		flags |= LOOKUP_BENEATH;
	}

	filename = getname_kernel(pathname);
	if (IS_ERR(filename))
		return PTR_ERR(filename);

	err = vfs_path_parent_lookup(filename, flags,
				     parent_path, &last, &type,
				     root_share_path);
	if (err) {
		putname(filename);
		return err;
	}

	if (unlikely(type != LAST_NORM)) {
		path_put(parent_path);
		putname(filename);
		return -ENOENT;
	}

	err = mnt_want_write(parent_path->mnt);
	if (err) {
		path_put(parent_path);
		putname(filename);
		return -ENOENT;
	}

	inode_lock_nested(parent_path->dentry->d_inode, I_MUTEX_PARENT);
	d = lookup_one_qstr_excl(&last, parent_path->dentry, 0);
	if (IS_ERR(d))
		goto err_out;

	if (d_is_negative(d)) {
		dput(d);
		goto err_out;
	}

	path->dentry = d;
	path->mnt = mntget(parent_path->mnt);

	if (test_share_config_flag(share_conf, KSMBD_SHARE_FLAG_CROSSMNT)) {
		err = follow_down(path);
		if (err < 0) {
			path_put(path);
			goto err_out;
		}
	}

	putname(filename);
	return 0;

err_out:
	inode_unlock(d_inode(parent_path->dentry));
	mnt_drop_write(parent_path->mnt);
	path_put(parent_path);
	putname(filename);
	return -ENOENT;
}

void ksmbd_vfs_query_maximal_access(struct user_namespace *user_ns,
				   struct dentry *dentry, __le32 *daccess)
{
	*daccess = cpu_to_le32(FILE_READ_ATTRIBUTES | READ_CONTROL);

	if (!inode_permission(user_ns, d_inode(dentry), MAY_OPEN | MAY_WRITE))
		*daccess |= cpu_to_le32(WRITE_DAC | WRITE_OWNER | SYNCHRONIZE |
				FILE_WRITE_DATA | FILE_APPEND_DATA |
				FILE_WRITE_EA | FILE_WRITE_ATTRIBUTES |
				FILE_DELETE_CHILD);

	if (!inode_permission(user_ns, d_inode(dentry), MAY_OPEN | MAY_READ))
		*daccess |= FILE_READ_DATA_LE | FILE_READ_EA_LE;

	if (!inode_permission(user_ns, d_inode(dentry), MAY_OPEN | MAY_EXEC))
		*daccess |= FILE_EXECUTE_LE;

	if (!inode_permission(user_ns, d_inode(dentry->d_parent), MAY_EXEC | MAY_WRITE))
		*daccess |= FILE_DELETE_LE;
}

/**
 * ksmbd_vfs_create() - vfs helper for smb create file
 * @work:	work
 * @name:	file name that is relative to share
 * @mode:	file create mode
 *
 * Return:	0 on success, otherwise error
 */
int ksmbd_vfs_create(struct ksmbd_work *work, const char *name, umode_t mode)
{
	struct path path;
	struct dentry *dentry;
	int err;

	dentry = ksmbd_vfs_kern_path_create(work, name,
					    LOOKUP_NO_SYMLINKS, &path);
	if (IS_ERR(dentry)) {
		err = PTR_ERR(dentry);
		if (err != -ENOENT)
			pr_err("path create failed for %s, err %d\n",
			       name, err);
		return err;
	}

	mode |= S_IFREG;
	err = vfs_create(mnt_user_ns(path.mnt), d_inode(path.dentry),
			 dentry, mode, true);
	if (!err) {
		ksmbd_vfs_inherit_owner(work, d_inode(path.dentry),
					d_inode(dentry));
	} else {
		pr_err("File(%s): creation failed (err:%d)\n", name, err);
	}

	done_path_create(&path, dentry);
	return err;
}

/**
 * ksmbd_vfs_mkdir() - vfs helper for smb create directory
 * @work:	work
 * @name:	directory name that is relative to share
 * @mode:	directory create mode
 *
 * Return:	0 on success, otherwise error
 */
int ksmbd_vfs_mkdir(struct ksmbd_work *work, const char *name, umode_t mode)
{
	struct user_namespace *user_ns;
	struct path path;
	struct dentry *dentry;
	int err;

	dentry = ksmbd_vfs_kern_path_create(work, name,
					    LOOKUP_NO_SYMLINKS | LOOKUP_DIRECTORY,
					    &path);
	if (IS_ERR(dentry)) {
		err = PTR_ERR(dentry);
		if (err != -EEXIST)
			ksmbd_debug(VFS, "path create failed for %s, err %d\n",
				    name, err);
		return err;
	}

	user_ns = mnt_user_ns(path.mnt);
	mode |= S_IFDIR;
	err = vfs_mkdir(user_ns, d_inode(path.dentry), dentry, mode);
	if (!err && d_unhashed(dentry)) {
		struct dentry *d;

		d = lookup_one(user_ns, dentry->d_name.name, dentry->d_parent,
			       dentry->d_name.len);
		if (IS_ERR(d)) {
			err = PTR_ERR(d);
			goto out_err;
		}
		if (unlikely(d_is_negative(d))) {
			dput(d);
			err = -ENOENT;
			goto out_err;
		}

		ksmbd_vfs_inherit_owner(work, d_inode(path.dentry), d_inode(d));
		dput(d);
	}

out_err:
	done_path_create(&path, dentry);
	if (err)
		pr_err("mkdir(%s): creation failed (err:%d)\n", name, err);
	return err;
}

static ssize_t ksmbd_vfs_getcasexattr(struct user_namespace *user_ns,
				      struct dentry *dentry, char *attr_name,
				      int attr_name_len, char **attr_value)
{
	char *name, *xattr_list = NULL;
	ssize_t value_len = -ENOENT, xattr_list_len;

	xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
	if (xattr_list_len <= 0)
		goto out;

	for (name = xattr_list; name - xattr_list < xattr_list_len;
			name += strlen(name) + 1) {
		ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
		if (strncasecmp(attr_name, name, attr_name_len))
			continue;

		value_len = ksmbd_vfs_getxattr(user_ns,
					       dentry,
					       name,
					       attr_value);
		if (value_len < 0)
			pr_err("failed to get xattr in file\n");
		break;
	}

out:
	kvfree(xattr_list);
	return value_len;
}

static int ksmbd_vfs_stream_read(struct ksmbd_file *fp, char *buf, loff_t *pos,
				 size_t count)
{
	ssize_t v_len;
	char *stream_buf = NULL;

	ksmbd_debug(VFS, "read stream data pos : %llu, count : %zd\n",
		    *pos, count);

	v_len = ksmbd_vfs_getcasexattr(file_mnt_user_ns(fp->filp),
				       fp->filp->f_path.dentry,
				       fp->stream.name,
				       fp->stream.size,
				       &stream_buf);
	if ((int)v_len <= 0)
		return (int)v_len;

	if (v_len <= *pos) {
		count = -EINVAL;
		goto free_buf;
	}

	if (v_len - *pos < count)
		count = v_len - *pos;

	memcpy(buf, &stream_buf[*pos], count);

free_buf:
	kvfree(stream_buf);
	return count;
}

/**
 * check_lock_range() - vfs helper for smb byte range file locking
 * @filp:	the file to apply the lock to
 * @start:	lock start byte offset
 * @end:	lock end byte offset
 * @type:	byte range type read/write
 *
 * Return:	0 on success, otherwise error
 */
static int check_lock_range(struct file *filp, loff_t start, loff_t end,
			    unsigned char type)
{
	struct file_lock *flock;
	struct file_lock_context *ctx = file_inode(filp)->i_flctx;
	int error = 0;

	if (!ctx || list_empty_careful(&ctx->flc_posix))
		return 0;

	spin_lock(&ctx->flc_lock);
	list_for_each_entry(flock, &ctx->flc_posix, fl_list) {
		/* check conflict locks */
		if (flock->fl_end >= start && end >= flock->fl_start) {
			if (flock->fl_type == F_RDLCK) {
				if (type == WRITE) {
					pr_err("not allow write by shared lock\n");
					error = 1;
					goto out;
				}
			} else if (flock->fl_type == F_WRLCK) {
				/* check owner in lock */
				if (flock->fl_file != filp) {
					error = 1;
					pr_err("not allow rw access by exclusive lock from other opens\n");
					goto out;
				}
			}
		}
	}
out:
	spin_unlock(&ctx->flc_lock);
	return error;
}

/**
 * ksmbd_vfs_read() - vfs helper for smb file read
 * @work:	smb work
 * @fid:	file id of open file
 * @count:	read byte count
 * @pos:	file pos
 * @rbuf:	read data buffer
 *
 * Return:	number of read bytes on success, otherwise error
 */
int ksmbd_vfs_read(struct ksmbd_work *work, struct ksmbd_file *fp, size_t count,
		   loff_t *pos, char *rbuf)
{
	struct file *filp = fp->filp;
	ssize_t nbytes = 0;
	struct inode *inode = file_inode(filp);

	if (S_ISDIR(inode->i_mode))
		return -EISDIR;

	if (unlikely(count == 0))
		return 0;

	if (work->conn->connection_type) {
		if (!(fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) {
			pr_err("no right to read(%pD)\n", fp->filp);
			return -EACCES;
		}
	}

	if (ksmbd_stream_fd(fp))
		return ksmbd_vfs_stream_read(fp, rbuf, pos, count);

	if (!work->tcon->posix_extensions) {
		int ret;

		ret = check_lock_range(filp, *pos, *pos + count - 1, READ);
		if (ret) {
			pr_err("unable to read due to lock\n");
			return -EAGAIN;
		}
	}

	nbytes = kernel_read(filp, rbuf, count, pos);
	if (nbytes < 0) {
		pr_err("smb read failed, err = %zd\n", nbytes);
		return nbytes;
	}

	filp->f_pos = *pos;
	return nbytes;
}

static int ksmbd_vfs_stream_write(struct ksmbd_file *fp, char *buf, loff_t *pos,
				  size_t count)
{
	char *stream_buf = NULL, *wbuf;
	struct user_namespace *user_ns = file_mnt_user_ns(fp->filp);
	size_t size;
	ssize_t v_len;
	int err = 0;

	ksmbd_debug(VFS, "write stream data pos : %llu, count : %zd\n",
		    *pos, count);

	size = *pos + count;
	if (size > XATTR_SIZE_MAX) {
		size = XATTR_SIZE_MAX;
		count = (*pos + count) - XATTR_SIZE_MAX;
	}

	v_len = ksmbd_vfs_getcasexattr(user_ns,
				       fp->filp->f_path.dentry,
				       fp->stream.name,
				       fp->stream.size,
				       &stream_buf);
	if (v_len < 0) {
		pr_err("not found stream in xattr : %zd\n", v_len);
		err = v_len;
		goto out;
	}

	if (v_len < size) {
		wbuf = kvzalloc(size, GFP_KERNEL);
		if (!wbuf) {
			err = -ENOMEM;
			goto out;
		}

		if (v_len > 0)
			memcpy(wbuf, stream_buf, v_len);
		kvfree(stream_buf);
		stream_buf = wbuf;
	}

	memcpy(&stream_buf[*pos], buf, count);

	err = ksmbd_vfs_setxattr(user_ns,
				 &fp->filp->f_path,
				 fp->stream.name,
				 (void *)stream_buf,
				 size,
				 0,
				 true);
	if (err < 0)
		goto out;

	fp->filp->f_pos = *pos;
	err = 0;
out:
	kvfree(stream_buf);
	return err;
}

/**
 * ksmbd_vfs_write() - vfs helper for smb file write
 * @work:	work
 * @fid:	file id of open file
 * @buf:	buf containing data for writing
 * @count:	read byte count
 * @pos:	file pos
 * @sync:	fsync after write
 * @written:	number of bytes written
 *
 * Return:	0 on success, otherwise error
 */
int ksmbd_vfs_write(struct ksmbd_work *work, struct ksmbd_file *fp,
		    char *buf, size_t count, loff_t *pos, bool sync,
		    ssize_t *written)
{
	struct file *filp;
	loff_t	offset = *pos;
	int err = 0;

	if (work->conn->connection_type) {
		if (!(fp->daccess & FILE_WRITE_DATA_LE)) {
			pr_err("no right to write(%pD)\n", fp->filp);
			err = -EACCES;
			goto out;
		}
	}

	filp = fp->filp;

	if (ksmbd_stream_fd(fp)) {
		err = ksmbd_vfs_stream_write(fp, buf, pos, count);
		if (!err)
			*written = count;
		goto out;
	}

	if (!work->tcon->posix_extensions) {
		err = check_lock_range(filp, *pos, *pos + count - 1, WRITE);
		if (err) {
			pr_err("unable to write due to lock\n");
			err = -EAGAIN;
			goto out;
		}
	}

	/* Reserve lease break for parent dir at closing time */
	fp->reserve_lease_break = true;

	/* Do we need to break any of a levelII oplock? */
	smb_break_all_levII_oplock(work, fp, 1);

	err = kernel_write(filp, buf, count, pos);
	if (err < 0) {
		ksmbd_debug(VFS, "smb write failed, err = %d\n", err);
		goto out;
	}

	filp->f_pos = *pos;
	*written = err;
	err = 0;
	if (sync) {
		err = vfs_fsync_range(filp, offset, offset + *written, 0);
		if (err < 0)
			pr_err("fsync failed for filename = %pD, err = %d\n",
			       fp->filp, err);
	}

out:
	return err;
}

/**
 * ksmbd_vfs_getattr() - vfs helper for smb getattr
 * @work:	work
 * @fid:	file id of open file
 * @attrs:	inode attributes
 *
 * Return:	0 on success, otherwise error
 */
int ksmbd_vfs_getattr(const struct path *path, struct kstat *stat)
{
	int err;

	err = vfs_getattr(path, stat, STATX_BTIME, AT_STATX_SYNC_AS_STAT);
	if (err)
		pr_err("getattr failed, err %d\n", err);
	return err;
}

/**
 * ksmbd_vfs_fsync() - vfs helper for smb fsync
 * @work:	work
 * @fid:	file id of open file
 *
 * Return:	0 on success, otherwise error
 */
int ksmbd_vfs_fsync(struct ksmbd_work *work, u64 fid, u64 p_id)
{
	struct ksmbd_file *fp;
	int err;

	fp = ksmbd_lookup_fd_slow(work, fid, p_id);
	if (!fp) {
		pr_err("failed to get filp for fid %llu\n", fid);
		return -ENOENT;
	}
	err = vfs_fsync(fp->filp, 0);
	if (err < 0)
		pr_err("smb fsync failed, err = %d\n", err);
	ksmbd_fd_put(work, fp);
	return err;
}

/**
 * ksmbd_vfs_remove_file() - vfs helper for smb rmdir or unlink
 * @name:	directory or file name that is relative to share
 *
 * Return:	0 on success, otherwise error
 */
int ksmbd_vfs_remove_file(struct ksmbd_work *work, const struct path *path)
{
	struct user_namespace *user_ns;
	struct dentry *parent = path->dentry->d_parent;
	int err;

	if (ksmbd_override_fsids(work))
		return -ENOMEM;

	if (!d_inode(path->dentry)->i_nlink) {
		err = -ENOENT;
		goto out_err;
	}

	user_ns = mnt_user_ns(path->mnt);
	if (S_ISDIR(d_inode(path->dentry)->i_mode)) {
		err = vfs_rmdir(user_ns, d_inode(parent), path->dentry);
		if (err && err != -ENOTEMPTY)
			ksmbd_debug(VFS, "rmdir failed, err %d\n", err);
	} else {
		err = vfs_unlink(user_ns, d_inode(parent), path->dentry, NULL);
		if (err)
			ksmbd_debug(VFS, "unlink failed, err %d\n", err);
	}

out_err:
	ksmbd_revert_fsids(work);
	return err;
}

/**
 * ksmbd_vfs_link() - vfs helper for creating smb hardlink
 * @oldname:	source file name
 * @newname:	hardlink name that is relative to share
 *
 * Return:	0 on success, otherwise error
 */
int ksmbd_vfs_link(struct ksmbd_work *work, const char *oldname,
		   const char *newname)
{
	struct path oldpath, newpath;
	struct dentry *dentry;
	int err;

	if (ksmbd_override_fsids(work))
		return -ENOMEM;

	err = kern_path(oldname, LOOKUP_NO_SYMLINKS, &oldpath);
	if (err) {
		pr_err("cannot get linux path for %s, err = %d\n",
		       oldname, err);
		goto out1;
	}

	dentry = ksmbd_vfs_kern_path_create(work, newname,
					    LOOKUP_NO_SYMLINKS | LOOKUP_REVAL,
					    &newpath);
	if (IS_ERR(dentry)) {
		err = PTR_ERR(dentry);
		pr_err("path create err for %s, err %d\n", newname, err);
		goto out2;
	}

	err = -EXDEV;
	if (oldpath.mnt != newpath.mnt) {
		pr_err("vfs_link failed err %d\n", err);
		goto out3;
	}

	err = vfs_link(oldpath.dentry, mnt_user_ns(newpath.mnt),
		       d_inode(newpath.dentry),
		       dentry, NULL);
	if (err)
		ksmbd_debug(VFS, "vfs_link failed err %d\n", err);

out3:
	done_path_create(&newpath, dentry);
out2:
	path_put(&oldpath);
out1:
	ksmbd_revert_fsids(work);
	return err;
}

int ksmbd_vfs_rename(struct ksmbd_work *work, const struct path *old_path,
		     char *newname, int flags)
{
	struct dentry *old_parent, *new_dentry, *trap;
	struct dentry *old_child = old_path->dentry;
	struct path new_path;
	struct qstr new_last;
	struct renamedata rd;
	struct filename *to;
	struct ksmbd_share_config *share_conf = work->tcon->share_conf;
	struct ksmbd_file *parent_fp;
	int new_type;
	int err, lookup_flags = LOOKUP_NO_SYMLINKS;

	if (ksmbd_override_fsids(work))
		return -ENOMEM;

	to = getname_kernel(newname);
	if (IS_ERR(to)) {
		err = PTR_ERR(to);
		goto revert_fsids;
	}

retry:
	err = vfs_path_parent_lookup(to, lookup_flags | LOOKUP_BENEATH,
				     &new_path, &new_last, &new_type,
				     &share_conf->vfs_path);
	if (err)
		goto out1;

	if (old_path->mnt != new_path.mnt) {
		err = -EXDEV;
		goto out2;
	}

	err = mnt_want_write(old_path->mnt);
	if (err)
		goto out2;

	trap = lock_rename_child(old_child, new_path.dentry);

	old_parent = dget(old_child->d_parent);
	if (d_unhashed(old_child)) {
		err = -EINVAL;
		goto out3;
	}

	parent_fp = ksmbd_lookup_fd_inode(old_child->d_parent);
	if (parent_fp) {
		if (parent_fp->daccess & FILE_DELETE_LE) {
			pr_err("parent dir is opened with delete access\n");
			err = -ESHARE;
			ksmbd_fd_put(work, parent_fp);
			goto out3;
		}
		ksmbd_fd_put(work, parent_fp);
	}

	new_dentry = lookup_one_qstr_excl(&new_last, new_path.dentry,
					  lookup_flags | LOOKUP_RENAME_TARGET);
	if (IS_ERR(new_dentry)) {
		err = PTR_ERR(new_dentry);
		goto out3;
	}

	if (d_is_symlink(new_dentry)) {
		err = -EACCES;
		goto out4;
	}

	/*
	 * explicitly handle file overwrite case, for compatibility with
	 * filesystems that may not support rename flags (e.g: fuse)
	 */
	if ((flags & RENAME_NOREPLACE) && d_is_positive(new_dentry)) {
		err = -EEXIST;
		goto out4;
	}
	flags &= ~(RENAME_NOREPLACE);

	if (old_child == trap) {
		err = -EINVAL;
		goto out4;
	}

	if (new_dentry == trap) {
		err = -ENOTEMPTY;
		goto out4;
	}

	rd.old_mnt_userns	= mnt_user_ns(old_path->mnt),
	rd.old_dir		= d_inode(old_parent),
	rd.old_dentry		= old_child,
	rd.new_mnt_userns	= mnt_user_ns(new_path.mnt),
	rd.new_dir		= new_path.dentry->d_inode,
	rd.new_dentry		= new_dentry,
	rd.flags		= flags,
	rd.delegated_inode	= NULL,
	err = vfs_rename(&rd);
	if (err)
		ksmbd_debug(VFS, "vfs_rename failed err %d\n", err);

out4:
	dput(new_dentry);
out3:
	dput(old_parent);
	unlock_rename(old_parent, new_path.dentry);
	mnt_drop_write(old_path->mnt);
out2:
	path_put(&new_path);

	if (retry_estale(err, lookup_flags)) {
		lookup_flags |= LOOKUP_REVAL;
		goto retry;
	}
out1:
	putname(to);
revert_fsids:
	ksmbd_revert_fsids(work);
	return err;
}

/**
 * ksmbd_vfs_truncate() - vfs helper for smb file truncate
 * @work:	work
 * @fid:	file id of old file
 * @size:	truncate to given size
 *
 * Return:	0 on success, otherwise error
 */
int ksmbd_vfs_truncate(struct ksmbd_work *work,
		       struct ksmbd_file *fp, loff_t size)
{
	int err = 0;
	struct file *filp;

	filp = fp->filp;

	/* Do we need to break any of a levelII oplock? */
	smb_break_all_levII_oplock(work, fp, 1);

	if (!work->tcon->posix_extensions) {
		struct inode *inode = file_inode(filp);

		if (size < inode->i_size) {
			err = check_lock_range(filp, size,
					       inode->i_size - 1, WRITE);
		} else {
			err = check_lock_range(filp, inode->i_size,
					       size - 1, WRITE);
		}

		if (err) {
			pr_err("failed due to lock\n");
			return -EAGAIN;
		}
	}

	err = vfs_truncate(&filp->f_path, size);
	if (err)
		pr_err("truncate failed, err %d\n", err);
	return err;
}

/**
 * ksmbd_vfs_listxattr() - vfs helper for smb list extended attributes
 * @dentry:	dentry of file for listing xattrs
 * @list:	destination buffer
 * @size:	destination buffer length
 *
 * Return:	xattr list length on success, otherwise error
 */
ssize_t ksmbd_vfs_listxattr(struct dentry *dentry, char **list)
{
	ssize_t size;
	char *vlist = NULL;

	size = vfs_listxattr(dentry, NULL, 0);
	if (size <= 0)
		return size;

	vlist = kvzalloc(size, GFP_KERNEL);
	if (!vlist)
		return -ENOMEM;

	*list = vlist;
	size = vfs_listxattr(dentry, vlist, size);
	if (size < 0) {
		ksmbd_debug(VFS, "listxattr failed\n");
		kvfree(vlist);
		*list = NULL;
	}

	return size;
}

static ssize_t ksmbd_vfs_xattr_len(struct user_namespace *user_ns,
				   struct dentry *dentry, char *xattr_name)
{
	return vfs_getxattr(user_ns, dentry, xattr_name, NULL, 0);
}

/**
 * ksmbd_vfs_getxattr() - vfs helper for smb get extended attributes value
 * @user_ns:	user namespace
 * @dentry:	dentry of file for getting xattrs
 * @xattr_name:	name of xattr name to query
 * @xattr_buf:	destination buffer xattr value
 *
 * Return:	read xattr value length on success, otherwise error
 */
ssize_t ksmbd_vfs_getxattr(struct user_namespace *user_ns,
			   struct dentry *dentry,
			   char *xattr_name, char **xattr_buf)
{
	ssize_t xattr_len;
	char *buf;

	*xattr_buf = NULL;
	xattr_len = ksmbd_vfs_xattr_len(user_ns, dentry, xattr_name);
	if (xattr_len < 0)
		return xattr_len;

	buf = kmalloc(xattr_len + 1, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	xattr_len = vfs_getxattr(user_ns, dentry, xattr_name,
				 (void *)buf, xattr_len);
	if (xattr_len > 0)
		*xattr_buf = buf;
	else
		kfree(buf);
	return xattr_len;
}

/**
 * ksmbd_vfs_setxattr() - vfs helper for smb set extended attributes value
 * @user_ns:	user namespace
 * @path:	path of dentry to set XATTR at
 * @attr_name:	xattr name for setxattr
 * @attr_value:	xattr value to set
 * @attr_size:	size of xattr value
 * @flags:	destination buffer length
 * @get_write:	get write access to a mount
 *
 * Return:	0 on success, otherwise error
 */
int ksmbd_vfs_setxattr(struct user_namespace *user_ns,
		       const struct path *path, const char *attr_name,
		       void *attr_value, size_t attr_size, int flags,
		       bool get_write)
{
	int err;

	if (get_write == true) {
		err = mnt_want_write(path->mnt);
		if (err)
			return err;
	}

	err = vfs_setxattr(user_ns,
			   path->dentry,
			   attr_name,
			   attr_value,
			   attr_size,
			   flags);
	if (err)
		ksmbd_debug(VFS, "setxattr failed, err %d\n", err);
	if (get_write == true)
		mnt_drop_write(path->mnt);
	return err;
}

/**
 * ksmbd_vfs_set_fadvise() - convert smb IO caching options to linux options
 * @filp:	file pointer for IO
 * @options:	smb IO options
 */
void ksmbd_vfs_set_fadvise(struct file *filp, __le32 option)
{
	struct address_space *mapping;

	mapping = filp->f_mapping;

	if (!option || !mapping)
		return;

	if (option & FILE_WRITE_THROUGH_LE) {
		filp->f_flags |= O_SYNC;
	} else if (option & FILE_SEQUENTIAL_ONLY_LE) {
		filp->f_ra.ra_pages = inode_to_bdi(mapping->host)->ra_pages * 2;
		spin_lock(&filp->f_lock);
		filp->f_mode &= ~FMODE_RANDOM;
		spin_unlock(&filp->f_lock);
	} else if (option & FILE_RANDOM_ACCESS_LE) {
		spin_lock(&filp->f_lock);
		filp->f_mode |= FMODE_RANDOM;
		spin_unlock(&filp->f_lock);
	}
}

int ksmbd_vfs_zero_data(struct ksmbd_work *work, struct ksmbd_file *fp,
			loff_t off, loff_t len)
{
	smb_break_all_levII_oplock(work, fp, 1);
	if (fp->f_ci->m_fattr & FILE_ATTRIBUTE_SPARSE_FILE_LE)
		return vfs_fallocate(fp->filp,
				     FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
				     off, len);

	return vfs_fallocate(fp->filp,
			     FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE,
			     off, len);
}

int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length,
			 struct file_allocated_range_buffer *ranges,
			 unsigned int in_count, unsigned int *out_count)
{
	struct file *f = fp->filp;
	struct inode *inode = file_inode(fp->filp);
	loff_t maxbytes = (u64)inode->i_sb->s_maxbytes, end;
	loff_t extent_start, extent_end;
	int ret = 0;

	if (start > maxbytes)
		return -EFBIG;

	if (!in_count)
		return 0;

	/*
	 * Shrink request scope to what the fs can actually handle.
	 */
	if (length > maxbytes || (maxbytes - length) < start)
		length = maxbytes - start;

	if (start + length > inode->i_size)
		length = inode->i_size - start;

	*out_count = 0;
	end = start + length;
	while (start < end && *out_count < in_count) {
		extent_start = vfs_llseek(f, start, SEEK_DATA);
		if (extent_start < 0) {
			if (extent_start != -ENXIO)
				ret = (int)extent_start;
			break;
		}

		if (extent_start >= end)
			break;

		extent_end = vfs_llseek(f, extent_start, SEEK_HOLE);
		if (extent_end < 0) {
			if (extent_end != -ENXIO)
				ret = (int)extent_end;
			break;
		} else if (extent_start >= extent_end) {
			break;
		}

		ranges[*out_count].file_offset = cpu_to_le64(extent_start);
		ranges[(*out_count)++].length =
			cpu_to_le64(min(extent_end, end) - extent_start);

		start = extent_end;
	}

	return ret;
}

int ksmbd_vfs_remove_xattr(struct user_namespace *user_ns,
			   const struct path *path, char *attr_name)
{
	int err;

	err = mnt_want_write(path->mnt);
	if (err)
		return err;

	err = vfs_removexattr(user_ns, path->dentry, attr_name);
	mnt_drop_write(path->mnt);

	return err;
}

int ksmbd_vfs_unlink(struct file *filp)
{
	int err = 0;
	struct dentry *dir, *dentry = filp->f_path.dentry;
	struct user_namespace *user_ns = file_mnt_user_ns(filp);

	err = mnt_want_write(filp->f_path.mnt);
	if (err)
		return err;

	dir = dget_parent(dentry);
	err = ksmbd_vfs_lock_parent(dir, dentry);
	if (err)
		goto out;
	dget(dentry);

	if (S_ISDIR(d_inode(dentry)->i_mode))
		err = vfs_rmdir(user_ns, d_inode(dir), dentry);
	else
		err = vfs_unlink(user_ns, d_inode(dir), dentry, NULL);

	dput(dentry);
	inode_unlock(d_inode(dir));
	if (err)
		ksmbd_debug(VFS, "failed to delete, err %d\n", err);
out:
	dput(dir);
	mnt_drop_write(filp->f_path.mnt);

	return err;
}

static bool __dir_empty(struct dir_context *ctx, const char *name, int namlen,
		       loff_t offset, u64 ino, unsigned int d_type)
{
	struct ksmbd_readdir_data *buf;

	buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
	buf->dirent_count++;

	return buf->dirent_count <= 2;
}

/**
 * ksmbd_vfs_empty_dir() - check for empty directory
 * @fp:	ksmbd file pointer
 *
 * Return:	true if directory empty, otherwise false
 */
int ksmbd_vfs_empty_dir(struct ksmbd_file *fp)
{
	int err;
	struct ksmbd_readdir_data readdir_data;

	memset(&readdir_data, 0, sizeof(struct ksmbd_readdir_data));

	set_ctx_actor(&readdir_data.ctx, __dir_empty);
	readdir_data.dirent_count = 0;

	err = iterate_dir(fp->filp, &readdir_data.ctx);
	if (readdir_data.dirent_count > 2)
		err = -ENOTEMPTY;
	else
		err = 0;
	return err;
}

static bool __caseless_lookup(struct dir_context *ctx, const char *name,
			     int namlen, loff_t offset, u64 ino,
			     unsigned int d_type)
{
	struct ksmbd_readdir_data *buf;
	int cmp = -EINVAL;

	buf = container_of(ctx, struct ksmbd_readdir_data, ctx);

	if (buf->used != namlen)
		return true;
	if (IS_ENABLED(CONFIG_UNICODE) && buf->um) {
		const struct qstr q_buf = {.name = buf->private,
					   .len = buf->used};
		const struct qstr q_name = {.name = name,
					    .len = namlen};

		cmp = utf8_strncasecmp(buf->um, &q_buf, &q_name);
	}
	if (cmp < 0)
		cmp = strncasecmp((char *)buf->private, name, namlen);
	if (!cmp) {
		memcpy((char *)buf->private, name, namlen);
		buf->dirent_count = 1;
		return false;
	}
	return true;
}

/**
 * ksmbd_vfs_lookup_in_dir() - lookup a file in a directory
 * @dir:	path info
 * @name:	filename to lookup
 * @namelen:	filename length
 *
 * Return:	0 on success, otherwise error
 */
static int ksmbd_vfs_lookup_in_dir(const struct path *dir, char *name,
				   size_t namelen, struct unicode_map *um)
{
	int ret;
	struct file *dfilp;
	int flags = O_RDONLY | O_LARGEFILE;
	struct ksmbd_readdir_data readdir_data = {
		.ctx.actor	= __caseless_lookup,
		.private	= name,
		.used		= namelen,
		.dirent_count	= 0,
		.um		= um,
	};

	dfilp = dentry_open(dir, flags, current_cred());
	if (IS_ERR(dfilp))
		return PTR_ERR(dfilp);

	ret = iterate_dir(dfilp, &readdir_data.ctx);
	if (readdir_data.dirent_count > 0)
		ret = 0;
	fput(dfilp);
	return ret;
}

/**
 * ksmbd_vfs_kern_path_locked() - lookup a file and get path info
 * @name:		file path that is relative to share
 * @flags:		lookup flags
 * @parent_path:	if lookup succeed, return parent_path info
 * @path:		if lookup succeed, return path info
 * @caseless:	caseless filename lookup
 *
 * Return:	0 on success, otherwise error
 */
int ksmbd_vfs_kern_path_locked(struct ksmbd_work *work, char *name,
			       unsigned int flags, struct path *parent_path,
			       struct path *path, bool caseless)
{
	struct ksmbd_share_config *share_conf = work->tcon->share_conf;
	int err;

	err = ksmbd_vfs_path_lookup_locked(share_conf, name, flags, parent_path,
					   path);
	if (!err)
		return 0;

	if (caseless) {
		char *filepath;
		size_t path_len, remain_len;

		filepath = kstrdup(name, GFP_KERNEL);
		if (!filepath)
			return -ENOMEM;

		path_len = strlen(filepath);
		remain_len = path_len;

		*parent_path = share_conf->vfs_path;
		path_get(parent_path);

		while (d_can_lookup(parent_path->dentry)) {
			char *filename = filepath + path_len - remain_len;
			char *next = strchrnul(filename, '/');
			size_t filename_len = next - filename;
			bool is_last = !next[0];

			if (filename_len == 0)
				break;

			err = ksmbd_vfs_lookup_in_dir(parent_path, filename,
						      filename_len,
						      work->conn->um);
			if (err)
				goto out2;

			next[0] = '\0';

			err = vfs_path_lookup(share_conf->vfs_path.dentry,
					      share_conf->vfs_path.mnt,
					      filepath,
					      flags,
					      path);
			if (err)
				goto out2;
			else if (is_last)
				goto out1;
			path_put(parent_path);
			*parent_path = *path;

			next[0] = '/';
			remain_len -= filename_len + 1;
		}

		err = -EINVAL;
out2:
		path_put(parent_path);
out1:
		kfree(filepath);
	}

	if (!err) {
		err = mnt_want_write(parent_path->mnt);
		if (err) {
			path_put(path);
			path_put(parent_path);
			return err;
		}

		err = ksmbd_vfs_lock_parent(parent_path->dentry, path->dentry);
		if (err) {
			path_put(path);
			path_put(parent_path);
		}
	}
	return err;
}

void ksmbd_vfs_kern_path_unlock(struct path *parent_path, struct path *path)
{
	inode_unlock(d_inode(parent_path->dentry));
	mnt_drop_write(parent_path->mnt);
	path_put(path);
	path_put(parent_path);
}

struct dentry *ksmbd_vfs_kern_path_create(struct ksmbd_work *work,
					  const char *name,
					  unsigned int flags,
					  struct path *path)
{
	char *abs_name;
	struct dentry *dent;

	abs_name = convert_to_unix_name(work->tcon->share_conf, name);
	if (!abs_name)
		return ERR_PTR(-ENOMEM);

	dent = kern_path_create(AT_FDCWD, abs_name, path, flags);
	kfree(abs_name);
	return dent;
}

int ksmbd_vfs_remove_acl_xattrs(struct user_namespace *user_ns,
				const struct path *path)
{
	char *name, *xattr_list = NULL;
	ssize_t xattr_list_len;
	int err = 0;

	xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list);
	if (xattr_list_len < 0) {
		goto out;
	} else if (!xattr_list_len) {
		ksmbd_debug(SMB, "empty xattr in the file\n");
		goto out;
	}

	for (name = xattr_list; name - xattr_list < xattr_list_len;
	     name += strlen(name) + 1) {
		ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));

		if (!strncmp(name, XATTR_NAME_POSIX_ACL_ACCESS,
			     sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1) ||
		    !strncmp(name, XATTR_NAME_POSIX_ACL_DEFAULT,
			     sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1)) {
			err = ksmbd_vfs_remove_xattr(user_ns, path, name);
			if (err)
				ksmbd_debug(SMB,
					    "remove acl xattr failed : %s\n", name);
		}
	}

out:
	kvfree(xattr_list);
	return err;
}

int ksmbd_vfs_remove_sd_xattrs(struct user_namespace *user_ns, const struct path *path)
{
	char *name, *xattr_list = NULL;
	ssize_t xattr_list_len;
	int err = 0;

	xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list);
	if (xattr_list_len < 0) {
		goto out;
	} else if (!xattr_list_len) {
		ksmbd_debug(SMB, "empty xattr in the file\n");
		goto out;
	}

	for (name = xattr_list; name - xattr_list < xattr_list_len;
			name += strlen(name) + 1) {
		ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));

		if (!strncmp(name, XATTR_NAME_SD, XATTR_NAME_SD_LEN)) {
			err = ksmbd_vfs_remove_xattr(user_ns, path, name);
			if (err)
				ksmbd_debug(SMB, "remove xattr failed : %s\n", name);
		}
	}
out:
	kvfree(xattr_list);
	return err;
}

static struct xattr_smb_acl *ksmbd_vfs_make_xattr_posix_acl(struct user_namespace *user_ns,
							    struct inode *inode,
							    int acl_type)
{
	struct xattr_smb_acl *smb_acl = NULL;
	struct posix_acl *posix_acls;
	struct posix_acl_entry *pa_entry;
	struct xattr_acl_entry *xa_entry;
	int i;

	if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
		return NULL;

	posix_acls = get_acl(inode, acl_type);
	if (IS_ERR_OR_NULL(posix_acls))
		return NULL;

	smb_acl = kzalloc(sizeof(struct xattr_smb_acl) +
			  sizeof(struct xattr_acl_entry) * posix_acls->a_count,
			  GFP_KERNEL);
	if (!smb_acl)
		goto out;

	smb_acl->count = posix_acls->a_count;
	pa_entry = posix_acls->a_entries;
	xa_entry = smb_acl->entries;
	for (i = 0; i < posix_acls->a_count; i++, pa_entry++, xa_entry++) {
		switch (pa_entry->e_tag) {
		case ACL_USER:
			xa_entry->type = SMB_ACL_USER;
			xa_entry->uid = posix_acl_uid_translate(user_ns, pa_entry);
			break;
		case ACL_USER_OBJ:
			xa_entry->type = SMB_ACL_USER_OBJ;
			break;
		case ACL_GROUP:
			xa_entry->type = SMB_ACL_GROUP;
			xa_entry->gid = posix_acl_gid_translate(user_ns, pa_entry);
			break;
		case ACL_GROUP_OBJ:
			xa_entry->type = SMB_ACL_GROUP_OBJ;
			break;
		case ACL_OTHER:
			xa_entry->type = SMB_ACL_OTHER;
			break;
		case ACL_MASK:
			xa_entry->type = SMB_ACL_MASK;
			break;
		default:
			pr_err("unknown type : 0x%x\n", pa_entry->e_tag);
			goto out;
		}

		if (pa_entry->e_perm & ACL_READ)
			xa_entry->perm |= SMB_ACL_READ;
		if (pa_entry->e_perm & ACL_WRITE)
			xa_entry->perm |= SMB_ACL_WRITE;
		if (pa_entry->e_perm & ACL_EXECUTE)
			xa_entry->perm |= SMB_ACL_EXECUTE;
	}
out:
	posix_acl_release(posix_acls);
	return smb_acl;
}

int ksmbd_vfs_set_sd_xattr(struct ksmbd_conn *conn,
			   struct user_namespace *user_ns,
			   const struct path *path,
			   struct smb_ntsd *pntsd, int len,
			   bool get_write)
{
	int rc;
	struct ndr sd_ndr = {0}, acl_ndr = {0};
	struct xattr_ntacl acl = {0};
	struct xattr_smb_acl *smb_acl, *def_smb_acl = NULL;
	struct dentry *dentry = path->dentry;
	struct inode *inode = d_inode(dentry);

	acl.version = 4;
	acl.hash_type = XATTR_SD_HASH_TYPE_SHA256;
	acl.current_time = ksmbd_UnixTimeToNT(current_time(inode));

	memcpy(acl.desc, "posix_acl", 9);
	acl.desc_len = 10;

	pntsd->osidoffset =
		cpu_to_le32(le32_to_cpu(pntsd->osidoffset) + NDR_NTSD_OFFSETOF);
	pntsd->gsidoffset =
		cpu_to_le32(le32_to_cpu(pntsd->gsidoffset) + NDR_NTSD_OFFSETOF);
	pntsd->dacloffset =
		cpu_to_le32(le32_to_cpu(pntsd->dacloffset) + NDR_NTSD_OFFSETOF);

	acl.sd_buf = (char *)pntsd;
	acl.sd_size = len;

	rc = ksmbd_gen_sd_hash(conn, acl.sd_buf, acl.sd_size, acl.hash);
	if (rc) {
		pr_err("failed to generate hash for ndr acl\n");
		return rc;
	}

	smb_acl = ksmbd_vfs_make_xattr_posix_acl(user_ns, inode,
						 ACL_TYPE_ACCESS);
	if (S_ISDIR(inode->i_mode))
		def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(user_ns, inode,
							     ACL_TYPE_DEFAULT);

	rc = ndr_encode_posix_acl(&acl_ndr, user_ns, inode,
				  smb_acl, def_smb_acl);
	if (rc) {
		pr_err("failed to encode ndr to posix acl\n");
		goto out;
	}

	rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset,
			       acl.posix_acl_hash);
	if (rc) {
		pr_err("failed to generate hash for ndr acl\n");
		goto out;
	}

	rc = ndr_encode_v4_ntacl(&sd_ndr, &acl);
	if (rc) {
		pr_err("failed to encode ndr to posix acl\n");
		goto out;
	}

	rc = ksmbd_vfs_setxattr(user_ns, path,
				XATTR_NAME_SD, sd_ndr.data,
				sd_ndr.offset, 0, get_write);
	if (rc < 0)
		pr_err("Failed to store XATTR ntacl :%d\n", rc);

	kfree(sd_ndr.data);
out:
	kfree(acl_ndr.data);
	kfree(smb_acl);
	kfree(def_smb_acl);
	return rc;
}

int ksmbd_vfs_get_sd_xattr(struct ksmbd_conn *conn,
			   struct user_namespace *user_ns,
			   struct dentry *dentry,
			   struct smb_ntsd **pntsd)
{
	int rc;
	struct ndr n;
	struct inode *inode = d_inode(dentry);
	struct ndr acl_ndr = {0};
	struct xattr_ntacl acl;
	struct xattr_smb_acl *smb_acl = NULL, *def_smb_acl = NULL;
	__u8 cmp_hash[XATTR_SD_HASH_SIZE] = {0};

	rc = ksmbd_vfs_getxattr(user_ns, dentry, XATTR_NAME_SD, &n.data);
	if (rc <= 0)
		return rc;

	n.length = rc;
	rc = ndr_decode_v4_ntacl(&n, &acl);
	if (rc)
		goto free_n_data;

	smb_acl = ksmbd_vfs_make_xattr_posix_acl(user_ns, inode,
						 ACL_TYPE_ACCESS);
	if (S_ISDIR(inode->i_mode))
		def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(user_ns, inode,
							     ACL_TYPE_DEFAULT);

	rc = ndr_encode_posix_acl(&acl_ndr, user_ns, inode, smb_acl,
				  def_smb_acl);
	if (rc) {
		pr_err("failed to encode ndr to posix acl\n");
		goto out_free;
	}

	rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset, cmp_hash);
	if (rc) {
		pr_err("failed to generate hash for ndr acl\n");
		goto out_free;
	}

	if (memcmp(cmp_hash, acl.posix_acl_hash, XATTR_SD_HASH_SIZE)) {
		pr_err("hash value diff\n");
		rc = -EINVAL;
		goto out_free;
	}

	*pntsd = acl.sd_buf;
	if (acl.sd_size < sizeof(struct smb_ntsd)) {
		pr_err("sd size is invalid\n");
		goto out_free;
	}

	(*pntsd)->osidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->osidoffset) -
					   NDR_NTSD_OFFSETOF);
	(*pntsd)->gsidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->gsidoffset) -
					   NDR_NTSD_OFFSETOF);
	(*pntsd)->dacloffset = cpu_to_le32(le32_to_cpu((*pntsd)->dacloffset) -
					   NDR_NTSD_OFFSETOF);

	rc = acl.sd_size;
out_free:
	kfree(acl_ndr.data);
	kfree(smb_acl);
	kfree(def_smb_acl);
	if (rc < 0) {
		kfree(acl.sd_buf);
		*pntsd = NULL;
	}

free_n_data:
	kfree(n.data);
	return rc;
}

int ksmbd_vfs_set_dos_attrib_xattr(struct user_namespace *user_ns,
				   const struct path *path,
				   struct xattr_dos_attrib *da,
				   bool get_write)
{
	struct ndr n;
	int err;

	err = ndr_encode_dos_attr(&n, da);
	if (err)
		return err;

	err = ksmbd_vfs_setxattr(user_ns, path, XATTR_NAME_DOS_ATTRIBUTE,
				 (void *)n.data, n.offset, 0, get_write);
	if (err)
		ksmbd_debug(SMB, "failed to store dos attribute in xattr\n");
	kfree(n.data);

	return err;
}

int ksmbd_vfs_get_dos_attrib_xattr(struct user_namespace *user_ns,
				   struct dentry *dentry,
				   struct xattr_dos_attrib *da)
{
	struct ndr n;
	int err;

	err = ksmbd_vfs_getxattr(user_ns, dentry, XATTR_NAME_DOS_ATTRIBUTE,
				 (char **)&n.data);
	if (err > 0) {
		n.length = err;
		if (ndr_decode_dos_attr(&n, da))
			err = -EINVAL;
		kfree(n.data);
	} else {
		ksmbd_debug(SMB, "failed to load dos attribute in xattr\n");
	}

	return err;
}

/**
 * ksmbd_vfs_init_kstat() - convert unix stat information to smb stat format
 * @p:          destination buffer
 * @ksmbd_kstat:      ksmbd kstat wrapper
 */
void *ksmbd_vfs_init_kstat(char **p, struct ksmbd_kstat *ksmbd_kstat)
{
	struct file_directory_info *info = (struct file_directory_info *)(*p);
	struct kstat *kstat = ksmbd_kstat->kstat;
	u64 time;

	info->FileIndex = 0;
	info->CreationTime = cpu_to_le64(ksmbd_kstat->create_time);
	time = ksmbd_UnixTimeToNT(kstat->atime);
	info->LastAccessTime = cpu_to_le64(time);
	time = ksmbd_UnixTimeToNT(kstat->mtime);
	info->LastWriteTime = cpu_to_le64(time);
	time = ksmbd_UnixTimeToNT(kstat->ctime);
	info->ChangeTime = cpu_to_le64(time);

	if (ksmbd_kstat->file_attributes & FILE_ATTRIBUTE_DIRECTORY_LE) {
		info->EndOfFile = 0;
		info->AllocationSize = 0;
	} else {
		info->EndOfFile = cpu_to_le64(kstat->size);
		info->AllocationSize = cpu_to_le64(kstat->blocks << 9);
	}
	info->ExtFileAttributes = ksmbd_kstat->file_attributes;

	return info;
}

int ksmbd_vfs_fill_dentry_attrs(struct ksmbd_work *work,
				struct user_namespace *user_ns,
				struct dentry *dentry,
				struct ksmbd_kstat *ksmbd_kstat)
{
	u64 time;
	int rc;

	generic_fillattr(user_ns, d_inode(dentry), ksmbd_kstat->kstat);

	time = ksmbd_UnixTimeToNT(ksmbd_kstat->kstat->ctime);
	ksmbd_kstat->create_time = time;

	/*
	 * set default value for the case that store dos attributes is not yes
	 * or that acl is disable in server's filesystem and the config is yes.
	 */
	if (S_ISDIR(ksmbd_kstat->kstat->mode))
		ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_DIRECTORY_LE;
	else
		ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_ARCHIVE_LE;

	if (test_share_config_flag(work->tcon->share_conf,
				   KSMBD_SHARE_FLAG_STORE_DOS_ATTRS)) {
		struct xattr_dos_attrib da;

		rc = ksmbd_vfs_get_dos_attrib_xattr(user_ns, dentry, &da);
		if (rc > 0) {
			ksmbd_kstat->file_attributes = cpu_to_le32(da.attr);
			ksmbd_kstat->create_time = da.create_time;
		} else {
			ksmbd_debug(VFS, "fail to load dos attribute.\n");
		}
	}

	return 0;
}

ssize_t ksmbd_vfs_casexattr_len(struct user_namespace *user_ns,
				struct dentry *dentry, char *attr_name,
				int attr_name_len)
{
	char *name, *xattr_list = NULL;
	ssize_t value_len = -ENOENT, xattr_list_len;

	xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
	if (xattr_list_len <= 0)
		goto out;

	for (name = xattr_list; name - xattr_list < xattr_list_len;
			name += strlen(name) + 1) {
		ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
		if (strncasecmp(attr_name, name, attr_name_len))
			continue;

		value_len = ksmbd_vfs_xattr_len(user_ns, dentry, name);
		break;
	}

out:
	kvfree(xattr_list);
	return value_len;
}

int ksmbd_vfs_xattr_stream_name(char *stream_name, char **xattr_stream_name,
				size_t *xattr_stream_name_size, int s_type)
{
	char *type, *buf;

	if (s_type == DIR_STREAM)
		type = ":$INDEX_ALLOCATION";
	else
		type = ":$DATA";

	buf = kasprintf(GFP_KERNEL, "%s%s%s",
			XATTR_NAME_STREAM, stream_name,	type);
	if (!buf)
		return -ENOMEM;

	*xattr_stream_name = buf;
	*xattr_stream_name_size = strlen(buf) + 1;

	return 0;
}

int ksmbd_vfs_copy_file_ranges(struct ksmbd_work *work,
			       struct ksmbd_file *src_fp,
			       struct ksmbd_file *dst_fp,
			       struct srv_copychunk *chunks,
			       unsigned int chunk_count,
			       unsigned int *chunk_count_written,
			       unsigned int *chunk_size_written,
			       loff_t *total_size_written)
{
	unsigned int i;
	loff_t src_off, dst_off, src_file_size;
	size_t len;
	int ret;

	*chunk_count_written = 0;
	*chunk_size_written = 0;
	*total_size_written = 0;

	if (!(src_fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) {
		pr_err("no right to read(%pD)\n", src_fp->filp);
		return -EACCES;
	}
	if (!(dst_fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE))) {
		pr_err("no right to write(%pD)\n", dst_fp->filp);
		return -EACCES;
	}

	if (ksmbd_stream_fd(src_fp) || ksmbd_stream_fd(dst_fp))
		return -EBADF;

	smb_break_all_levII_oplock(work, dst_fp, 1);

	if (!work->tcon->posix_extensions) {
		for (i = 0; i < chunk_count; i++) {
			src_off = le64_to_cpu(chunks[i].SourceOffset);
			dst_off = le64_to_cpu(chunks[i].TargetOffset);
			len = le32_to_cpu(chunks[i].Length);

			if (check_lock_range(src_fp->filp, src_off,
					     src_off + len - 1, READ))
				return -EAGAIN;
			if (check_lock_range(dst_fp->filp, dst_off,
					     dst_off + len - 1, WRITE))
				return -EAGAIN;
		}
	}

	src_file_size = i_size_read(file_inode(src_fp->filp));

	for (i = 0; i < chunk_count; i++) {
		src_off = le64_to_cpu(chunks[i].SourceOffset);
		dst_off = le64_to_cpu(chunks[i].TargetOffset);
		len = le32_to_cpu(chunks[i].Length);

		if (src_off + len > src_file_size)
			return -E2BIG;

		ret = vfs_copy_file_range(src_fp->filp, src_off,
					  dst_fp->filp, dst_off, len, 0);
		if (ret == -EOPNOTSUPP || ret == -EXDEV)
			ret = vfs_copy_file_range(src_fp->filp, src_off,
						  dst_fp->filp, dst_off, len,
						  COPY_FILE_SPLICE);
		if (ret < 0)
			return ret;

		*chunk_count_written += 1;
		*total_size_written += ret;
	}
	return 0;
}

void ksmbd_vfs_posix_lock_wait(struct file_lock *flock)
{
	wait_event(flock->fl_wait, !flock->fl_blocker);
}

int ksmbd_vfs_posix_lock_wait_timeout(struct file_lock *flock, long timeout)
{
	return wait_event_interruptible_timeout(flock->fl_wait,
						!flock->fl_blocker,
						timeout);
}

void ksmbd_vfs_posix_lock_unblock(struct file_lock *flock)
{
	locks_delete_block(flock);
}

int ksmbd_vfs_set_init_posix_acl(struct user_namespace *user_ns,
				 struct path *path)
{
	struct posix_acl_state acl_state;
	struct posix_acl *acls;
	struct inode *inode = d_inode(path->dentry);
	int rc;

	if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
		return -EOPNOTSUPP;

	ksmbd_debug(SMB, "Set posix acls\n");
	rc = init_acl_state(&acl_state, 1);
	if (rc)
		return rc;

	/* Set default owner group */
	acl_state.owner.allow = (inode->i_mode & 0700) >> 6;
	acl_state.group.allow = (inode->i_mode & 0070) >> 3;
	acl_state.other.allow = inode->i_mode & 0007;
	acl_state.users->aces[acl_state.users->n].uid = inode->i_uid;
	acl_state.users->aces[acl_state.users->n++].perms.allow =
		acl_state.owner.allow;
	acl_state.groups->aces[acl_state.groups->n].gid = inode->i_gid;
	acl_state.groups->aces[acl_state.groups->n++].perms.allow =
		acl_state.group.allow;
	acl_state.mask.allow = 0x07;

	acls = posix_acl_alloc(6, GFP_KERNEL);
	if (!acls) {
		free_acl_state(&acl_state);
		return -ENOMEM;
	}
	posix_state_to_acl(&acl_state, acls->a_entries);

	rc = set_posix_acl(user_ns, inode, ACL_TYPE_ACCESS, acls);
	if (rc < 0)
		ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
			    rc);
	else if (S_ISDIR(inode->i_mode)) {
		posix_state_to_acl(&acl_state, acls->a_entries);
		rc = set_posix_acl(user_ns, inode, ACL_TYPE_DEFAULT,
				   acls);
		if (rc < 0)
			ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
				    rc);
	}

	free_acl_state(&acl_state);
	posix_acl_release(acls);
	return rc;
}

int ksmbd_vfs_inherit_posix_acl(struct user_namespace *user_ns,
				struct path *path, struct inode *parent_inode)
{
	struct posix_acl *acls;
	struct posix_acl_entry *pace;
	struct inode *inode = d_inode(path->dentry);
	int rc, i;

	if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
		return -EOPNOTSUPP;

	acls = get_acl(parent_inode, ACL_TYPE_DEFAULT);
	if (IS_ERR_OR_NULL(acls))
		return -ENOENT;
	pace = acls->a_entries;

	for (i = 0; i < acls->a_count; i++, pace++) {
		if (pace->e_tag == ACL_MASK) {
			pace->e_perm = 0x07;
			break;
		}
	}

	rc = set_posix_acl(user_ns, inode, ACL_TYPE_ACCESS, acls);
	if (rc < 0)
		ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
			    rc);
	if (S_ISDIR(inode->i_mode)) {
		rc = set_posix_acl(user_ns, inode, ACL_TYPE_DEFAULT,
				   acls);
		if (rc < 0)
			ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
				    rc);
	}

	posix_acl_release(acls);
	return rc;
}