aboutsummaryrefslogtreecommitdiff
path: root/fs/xfs/linux-2.6/xfs_ioctl.c
blob: e59a8106283069b24bb9fb4b5f0ea5bec92d8ede (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
/*
 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_bit.h"
#include "xfs_log.h"
#include "xfs_inum.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir2.h"
#include "xfs_alloc.h"
#include "xfs_dmapi.h"
#include "xfs_mount.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_attr_sf.h"
#include "xfs_dir2_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_ioctl.h"
#include "xfs_btree.h"
#include "xfs_ialloc.h"
#include "xfs_rtalloc.h"
#include "xfs_itable.h"
#include "xfs_error.h"
#include "xfs_rw.h"
#include "xfs_attr.h"
#include "xfs_bmap.h"
#include "xfs_buf_item.h"
#include "xfs_utils.h"
#include "xfs_dfrag.h"
#include "xfs_fsops.h"
#include "xfs_vnodeops.h"
#include "xfs_quota.h"
#include "xfs_inode_item.h"
#include "xfs_export.h"
#include "xfs_trace.h"

#include <linux/capability.h>
#include <linux/dcache.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/pagemap.h>
#include <linux/slab.h>
#include <linux/exportfs.h>

/*
 * xfs_find_handle maps from userspace xfs_fsop_handlereq structure to
 * a file or fs handle.
 *
 * XFS_IOC_PATH_TO_FSHANDLE
 *    returns fs handle for a mount point or path within that mount point
 * XFS_IOC_FD_TO_HANDLE
 *    returns full handle for a FD opened in user space
 * XFS_IOC_PATH_TO_HANDLE
 *    returns full handle for a path
 */
int
xfs_find_handle(
	unsigned int		cmd,
	xfs_fsop_handlereq_t	*hreq)
{
	int			hsize;
	xfs_handle_t		handle;
	struct inode		*inode;
	struct file		*file = NULL;
	struct path		path;
	int			error;
	struct xfs_inode	*ip;

	if (cmd == XFS_IOC_FD_TO_HANDLE) {
		file = fget(hreq->fd);
		if (!file)
			return -EBADF;
		inode = file->f_path.dentry->d_inode;
	} else {
		error = user_lpath((const char __user *)hreq->path, &path);
		if (error)
			return error;
		inode = path.dentry->d_inode;
	}
	ip = XFS_I(inode);

	/*
	 * We can only generate handles for inodes residing on a XFS filesystem,
	 * and only for regular files, directories or symbolic links.
	 */
	error = -EINVAL;
	if (inode->i_sb->s_magic != XFS_SB_MAGIC)
		goto out_put;

	error = -EBADF;
	if (!S_ISREG(inode->i_mode) &&
	    !S_ISDIR(inode->i_mode) &&
	    !S_ISLNK(inode->i_mode))
		goto out_put;


	memcpy(&handle.ha_fsid, ip->i_mount->m_fixedfsid, sizeof(xfs_fsid_t));

	if (cmd == XFS_IOC_PATH_TO_FSHANDLE) {
		/*
		 * This handle only contains an fsid, zero the rest.
		 */
		memset(&handle.ha_fid, 0, sizeof(handle.ha_fid));
		hsize = sizeof(xfs_fsid_t);
	} else {
		int		lock_mode;

		lock_mode = xfs_ilock_map_shared(ip);
		handle.ha_fid.fid_len = sizeof(xfs_fid_t) -
					sizeof(handle.ha_fid.fid_len);
		handle.ha_fid.fid_pad = 0;
		handle.ha_fid.fid_gen = ip->i_d.di_gen;
		handle.ha_fid.fid_ino = ip->i_ino;
		xfs_iunlock_map_shared(ip, lock_mode);

		hsize = XFS_HSIZE(handle);
	}

	error = -EFAULT;
	if (copy_to_user(hreq->ohandle, &handle, hsize) ||
	    copy_to_user(hreq->ohandlen, &hsize, sizeof(__s32)))
		goto out_put;

	error = 0;

 out_put:
	if (cmd == XFS_IOC_FD_TO_HANDLE)
		fput(file);
	else
		path_put(&path);
	return error;
}

/*
 * No need to do permission checks on the various pathname components
 * as the handle operations are privileged.
 */
STATIC int
xfs_handle_acceptable(
	void			*context,
	struct dentry		*dentry)
{
	return 1;
}

/*
 * Convert userspace handle data into a dentry.
 */
struct dentry *
xfs_handle_to_dentry(
	struct file		*parfilp,
	void __user		*uhandle,
	u32			hlen)
{
	xfs_handle_t		handle;
	struct xfs_fid64	fid;

	/*
	 * Only allow handle opens under a directory.
	 */
	if (!S_ISDIR(parfilp->f_path.dentry->d_inode->i_mode))
		return ERR_PTR(-ENOTDIR);

	if (hlen != sizeof(xfs_handle_t))
		return ERR_PTR(-EINVAL);
	if (copy_from_user(&handle, uhandle, hlen))
		return ERR_PTR(-EFAULT);
	if (handle.ha_fid.fid_len !=
	    sizeof(handle.ha_fid) - sizeof(handle.ha_fid.fid_len))
		return ERR_PTR(-EINVAL);

	memset(&fid, 0, sizeof(struct fid));
	fid.ino = handle.ha_fid.fid_ino;
	fid.gen = handle.ha_fid.fid_gen;

	return exportfs_decode_fh(parfilp->f_path.mnt, (struct fid *)&fid, 3,
			FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG,
			xfs_handle_acceptable, NULL);
}

STATIC struct dentry *
xfs_handlereq_to_dentry(
	struct file		*parfilp,
	xfs_fsop_handlereq_t	*hreq)
{
	return xfs_handle_to_dentry(parfilp, hreq->ihandle, hreq->ihandlen);
}

int
xfs_open_by_handle(
	struct file		*parfilp,
	xfs_fsop_handlereq_t	*hreq)
{
	const struct cred	*cred = current_cred();
	int			error;
	int			fd;
	int			permflag;
	struct file		*filp;
	struct inode		*inode;
	struct dentry		*dentry;

	if (!capable(CAP_SYS_ADMIN))
		return -XFS_ERROR(EPERM);

	dentry = xfs_handlereq_to_dentry(parfilp, hreq);
	if (IS_ERR(dentry))
		return PTR_ERR(dentry);
	inode = dentry->d_inode;

	/* Restrict xfs_open_by_handle to directories & regular files. */
	if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode))) {
		error = -XFS_ERROR(EPERM);
		goto out_dput;
	}

#if BITS_PER_LONG != 32
	hreq->oflags |= O_LARGEFILE;
#endif

	/* Put open permission in namei format. */
	permflag = hreq->oflags;
	if ((permflag+1) & O_ACCMODE)
		permflag++;
	if (permflag & O_TRUNC)
		permflag |= 2;

	if ((!(permflag & O_APPEND) || (permflag & O_TRUNC)) &&
	    (permflag & FMODE_WRITE) && IS_APPEND(inode)) {
		error = -XFS_ERROR(EPERM);
		goto out_dput;
	}

	if ((permflag & FMODE_WRITE) && IS_IMMUTABLE(inode)) {
		error = -XFS_ERROR(EACCES);
		goto out_dput;
	}

	/* Can't write directories. */
	if (S_ISDIR(inode->i_mode) && (permflag & FMODE_WRITE)) {
		error = -XFS_ERROR(EISDIR);
		goto out_dput;
	}

	fd = get_unused_fd();
	if (fd < 0) {
		error = fd;
		goto out_dput;
	}

	filp = dentry_open(dentry, mntget(parfilp->f_path.mnt),
			   hreq->oflags, cred);
	if (IS_ERR(filp)) {
		put_unused_fd(fd);
		return PTR_ERR(filp);
	}

	if (inode->i_mode & S_IFREG) {
		filp->f_flags |= O_NOATIME;
		filp->f_mode |= FMODE_NOCMTIME;
	}

	fd_install(fd, filp);
	return fd;

 out_dput:
	dput(dentry);
	return error;
}

/*
 * This is a copy from fs/namei.c:vfs_readlink(), except for removing it's
 * unused first argument.
 */
STATIC int
do_readlink(
	char __user		*buffer,
	int			buflen,
	const char		*link)
{
        int len;

	len = PTR_ERR(link);
	if (IS_ERR(link))
		goto out;

	len = strlen(link);
	if (len > (unsigned) buflen)
		len = buflen;
	if (copy_to_user(buffer, link, len))
		len = -EFAULT;
 out:
	return len;
}


int
xfs_readlink_by_handle(
	struct file		*parfilp,
	xfs_fsop_handlereq_t	*hreq)
{
	struct dentry		*dentry;
	__u32			olen;
	void			*link;
	int			error;

	if (!capable(CAP_SYS_ADMIN))
		return -XFS_ERROR(EPERM);

	dentry = xfs_handlereq_to_dentry(parfilp, hreq);
	if (IS_ERR(dentry))
		return PTR_ERR(dentry);

	/* Restrict this handle operation to symlinks only. */
	if (!S_ISLNK(dentry->d_inode->i_mode)) {
		error = -XFS_ERROR(EINVAL);
		goto out_dput;
	}

	if (copy_from_user(&olen, hreq->ohandlen, sizeof(__u32))) {
		error = -XFS_ERROR(EFAULT);
		goto out_dput;
	}

	link = kmalloc(MAXPATHLEN+1, GFP_KERNEL);
	if (!link) {
		error = -XFS_ERROR(ENOMEM);
		goto out_dput;
	}

	error = -xfs_readlink(XFS_I(dentry->d_inode), link);
	if (error)
		goto out_kfree;
	error = do_readlink(hreq->ohandle, olen, link);
	if (error)
		goto out_kfree;

 out_kfree:
	kfree(link);
 out_dput:
	dput(dentry);
	return error;
}

STATIC int
xfs_fssetdm_by_handle(
	struct file		*parfilp,
	void			__user *arg)
{
	int			error;
	struct fsdmidata	fsd;
	xfs_fsop_setdm_handlereq_t dmhreq;
	struct dentry		*dentry;

	if (!capable(CAP_MKNOD))
		return -XFS_ERROR(EPERM);
	if (copy_from_user(&dmhreq, arg, sizeof(xfs_fsop_setdm_handlereq_t)))
		return -XFS_ERROR(EFAULT);

	dentry = xfs_handlereq_to_dentry(parfilp, &dmhreq.hreq);
	if (IS_ERR(dentry))
		return PTR_ERR(dentry);

	if (IS_IMMUTABLE(dentry->d_inode) || IS_APPEND(dentry->d_inode)) {
		error = -XFS_ERROR(EPERM);
		goto out;
	}

	if (copy_from_user(&fsd, dmhreq.data, sizeof(fsd))) {
		error = -XFS_ERROR(EFAULT);
		goto out;
	}

	error = -xfs_set_dmattrs(XFS_I(dentry->d_inode), fsd.fsd_dmevmask,
				 fsd.fsd_dmstate);

 out:
	dput(dentry);
	return error;
}

STATIC int
xfs_attrlist_by_handle(
	struct file		*parfilp,
	void			__user *arg)
{
	int			error = -ENOMEM;
	attrlist_cursor_kern_t	*cursor;
	xfs_fsop_attrlist_handlereq_t al_hreq;
	struct dentry		*dentry;
	char			*kbuf;

	if (!capable(CAP_SYS_ADMIN))
		return -XFS_ERROR(EPERM);
	if (copy_from_user(&al_hreq, arg, sizeof(xfs_fsop_attrlist_handlereq_t)))
		return -XFS_ERROR(EFAULT);
	if (al_hreq.buflen > XATTR_LIST_MAX)
		return -XFS_ERROR(EINVAL);

	/*
	 * Reject flags, only allow namespaces.
	 */
	if (al_hreq.flags & ~(ATTR_ROOT | ATTR_SECURE))
		return -XFS_ERROR(EINVAL);

	dentry = xfs_handlereq_to_dentry(parfilp, &al_hreq.hreq);
	if (IS_ERR(dentry))
		return PTR_ERR(dentry);

	kbuf = kmalloc(al_hreq.buflen, GFP_KERNEL);
	if (!kbuf)
		goto out_dput;

	cursor = (attrlist_cursor_kern_t *)&al_hreq.pos;
	error = -xfs_attr_list(XFS_I(dentry->d_inode), kbuf, al_hreq.buflen,
					al_hreq.flags, cursor);
	if (error)
		goto out_kfree;

	if (copy_to_user(al_hreq.buffer, kbuf, al_hreq.buflen))
		error = -EFAULT;

 out_kfree:
	kfree(kbuf);
 out_dput:
	dput(dentry);
	return error;
}

int
xfs_attrmulti_attr_get(
	struct inode		*inode,
	unsigned char		*name,
	unsigned char		__user *ubuf,
	__uint32_t		*len,
	__uint32_t		flags)
{
	unsigned char		*kbuf;
	int			error = EFAULT;

	if (*len > XATTR_SIZE_MAX)
		return EINVAL;
	kbuf = kmalloc(*len, GFP_KERNEL);
	if (!kbuf)
		return ENOMEM;

	error = xfs_attr_get(XFS_I(inode), name, kbuf, (int *)len, flags);
	if (error)
		goto out_kfree;

	if (copy_to_user(ubuf, kbuf, *len))
		error = EFAULT;

 out_kfree:
	kfree(kbuf);
	return error;
}

int
xfs_attrmulti_attr_set(
	struct inode		*inode,
	unsigned char		*name,
	const unsigned char	__user *ubuf,
	__uint32_t		len,
	__uint32_t		flags)
{
	unsigned char		*kbuf;
	int			error = EFAULT;

	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
		return EPERM;
	if (len > XATTR_SIZE_MAX)
		return EINVAL;

	kbuf = memdup_user(ubuf, len);
	if (IS_ERR(kbuf))
		return PTR_ERR(kbuf);

	error = xfs_attr_set(XFS_I(inode), name, kbuf, len, flags);

	return error;
}

int
xfs_attrmulti_attr_remove(
	struct inode		*inode,
	unsigned char		*name,
	__uint32_t		flags)
{
	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
		return EPERM;
	return xfs_attr_remove(XFS_I(inode), name, flags);
}

STATIC int
xfs_attrmulti_by_handle(
	struct file		*parfilp,
	void			__user *arg)
{
	int			error;
	xfs_attr_multiop_t	*ops;
	xfs_fsop_attrmulti_handlereq_t am_hreq;
	struct dentry		*dentry;
	unsigned int		i, size;
	unsigned char		*attr_name;

	if (!capable(CAP_SYS_ADMIN))
		return -XFS_ERROR(EPERM);
	if (copy_from_user(&am_hreq, arg, sizeof(xfs_fsop_attrmulti_handlereq_t)))
		return -XFS_ERROR(EFAULT);

	/* overflow check */
	if (am_hreq.opcount >= INT_MAX / sizeof(xfs_attr_multiop_t))
		return -E2BIG;

	dentry = xfs_handlereq_to_dentry(parfilp, &am_hreq.hreq);
	if (IS_ERR(dentry))
		return PTR_ERR(dentry);

	error = E2BIG;
	size = am_hreq.opcount * sizeof(xfs_attr_multiop_t);
	if (!size || size > 16 * PAGE_SIZE)
		goto out_dput;

	ops = memdup_user(am_hreq.ops, size);
	if (IS_ERR(ops)) {
		error = PTR_ERR(ops);
		goto out_dput;
	}

	attr_name = kmalloc(MAXNAMELEN, GFP_KERNEL);
	if (!attr_name)
		goto out_kfree_ops;

	error = 0;
	for (i = 0; i < am_hreq.opcount; i++) {
		ops[i].am_error = strncpy_from_user((char *)attr_name,
				ops[i].am_attrname, MAXNAMELEN);
		if (ops[i].am_error == 0 || ops[i].am_error == MAXNAMELEN)
			error = -ERANGE;
		if (ops[i].am_error < 0)
			break;

		switch (ops[i].am_opcode) {
		case ATTR_OP_GET:
			ops[i].am_error = xfs_attrmulti_attr_get(
					dentry->d_inode, attr_name,
					ops[i].am_attrvalue, &ops[i].am_length,
					ops[i].am_flags);
			break;
		case ATTR_OP_SET:
			ops[i].am_error = mnt_want_write(parfilp->f_path.mnt);
			if (ops[i].am_error)
				break;
			ops[i].am_error = xfs_attrmulti_attr_set(
					dentry->d_inode, attr_name,
					ops[i].am_attrvalue, ops[i].am_length,
					ops[i].am_flags);
			mnt_drop_write(parfilp->f_path.mnt);
			break;
		case ATTR_OP_REMOVE:
			ops[i].am_error = mnt_want_write(parfilp->f_path.mnt);
			if (ops[i].am_error)
				break;
			ops[i].am_error = xfs_attrmulti_attr_remove(
					dentry->d_inode, attr_name,
					ops[i].am_flags);
			mnt_drop_write(parfilp->f_path.mnt);
			break;
		default:
			ops[i].am_error = EINVAL;
		}
	}

	if (copy_to_user(am_hreq.ops, ops, size))
		error = XFS_ERROR(EFAULT);

	kfree(attr_name);
 out_kfree_ops:
	kfree(ops);
 out_dput:
	dput(dentry);
	return -error;
}

int
xfs_ioc_space(
	struct xfs_inode	*ip,
	struct inode		*inode,
	struct file		*filp,
	int			ioflags,
	unsigned int		cmd,
	xfs_flock64_t		*bf)
{
	int			attr_flags = 0;
	int			error;

	/*
	 * Only allow the sys admin to reserve space unless
	 * unwritten extents are enabled.
	 */
	if (!xfs_sb_version_hasextflgbit(&ip->i_mount->m_sb) &&
	    !capable(CAP_SYS_ADMIN))
		return -XFS_ERROR(EPERM);

	if (inode->i_flags & (S_IMMUTABLE|S_APPEND))
		return -XFS_ERROR(EPERM);

	if (!(filp->f_mode & FMODE_WRITE))
		return -XFS_ERROR(EBADF);

	if (!S_ISREG(inode->i_mode))
		return -XFS_ERROR(EINVAL);

	if (filp->f_flags & (O_NDELAY|O_NONBLOCK))
		attr_flags |= XFS_ATTR_NONBLOCK;
	if (ioflags & IO_INVIS)
		attr_flags |= XFS_ATTR_DMI;

	error = xfs_change_file_space(ip, cmd, bf, filp->f_pos, attr_flags);
	return -error;
}

STATIC int
xfs_ioc_bulkstat(
	xfs_mount_t		*mp,
	unsigned int		cmd,
	void			__user *arg)
{
	xfs_fsop_bulkreq_t	bulkreq;
	int			count;	/* # of records returned */
	xfs_ino_t		inlast;	/* last inode number */
	int			done;
	int			error;

	/* done = 1 if there are more stats to get and if bulkstat */
	/* should be called again (unused here, but used in dmapi) */

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	if (XFS_FORCED_SHUTDOWN(mp))
		return -XFS_ERROR(EIO);

	if (copy_from_user(&bulkreq, arg, sizeof(xfs_fsop_bulkreq_t)))
		return -XFS_ERROR(EFAULT);

	if (copy_from_user(&inlast, bulkreq.lastip, sizeof(__s64)))
		return -XFS_ERROR(EFAULT);

	if ((count = bulkreq.icount) <= 0)
		return -XFS_ERROR(EINVAL);

	if (bulkreq.ubuffer == NULL)
		return -XFS_ERROR(EINVAL);

	if (cmd == XFS_IOC_FSINUMBERS)
		error = xfs_inumbers(mp, &inlast, &count,
					bulkreq.ubuffer, xfs_inumbers_fmt);
	else if (cmd == XFS_IOC_FSBULKSTAT_SINGLE)
		error = xfs_bulkstat_single(mp, &inlast,
						bulkreq.ubuffer, &done);
	else	/* XFS_IOC_FSBULKSTAT */
		error = xfs_bulkstat(mp, &inlast, &count, xfs_bulkstat_one,
				     sizeof(xfs_bstat_t), bulkreq.ubuffer,
				     &done);

	if (error)
		return -error;

	if (bulkreq.ocount != NULL) {
		if (copy_to_user(bulkreq.lastip, &inlast,
						sizeof(xfs_ino_t)))
			return -XFS_ERROR(EFAULT);

		if (copy_to_user(bulkreq.ocount, &count, sizeof(count)))
			return -XFS_ERROR(EFAULT);
	}

	return 0;
}

STATIC int
xfs_ioc_fsgeometry_v1(
	xfs_mount_t		*mp,
	void			__user *arg)
{
	xfs_fsop_geom_v1_t	fsgeo;
	int			error;

	error = xfs_fs_geometry(mp, (xfs_fsop_geom_t *)&fsgeo, 3);
	if (error)
		return -error;

	if (copy_to_user(arg, &fsgeo, sizeof(fsgeo)))
		return -XFS_ERROR(EFAULT);
	return 0;
}

STATIC int
xfs_ioc_fsgeometry(
	xfs_mount_t		*mp,
	void			__user *arg)
{
	xfs_fsop_geom_t		fsgeo;
	int			error;

	error = xfs_fs_geometry(mp, &fsgeo, 4);
	if (error)
		return -error;

	if (copy_to_user(arg, &fsgeo, sizeof(fsgeo)))
		return -XFS_ERROR(EFAULT);
	return 0;
}

/*
 * Linux extended inode flags interface.
 */

STATIC unsigned int
xfs_merge_ioc_xflags(
	unsigned int	flags,
	unsigned int	start)
{
	unsigned int	xflags = start;

	if (flags & FS_IMMUTABLE_FL)
		xflags |= XFS_XFLAG_IMMUTABLE;
	else
		xflags &= ~XFS_XFLAG_IMMUTABLE;
	if (flags & FS_APPEND_FL)
		xflags |= XFS_XFLAG_APPEND;
	else
		xflags &= ~XFS_XFLAG_APPEND;
	if (flags & FS_SYNC_FL)
		xflags |= XFS_XFLAG_SYNC;
	else
		xflags &= ~XFS_XFLAG_SYNC;
	if (flags & FS_NOATIME_FL)
		xflags |= XFS_XFLAG_NOATIME;
	else
		xflags &= ~XFS_XFLAG_NOATIME;
	if (flags & FS_NODUMP_FL)
		xflags |= XFS_XFLAG_NODUMP;
	else
		xflags &= ~XFS_XFLAG_NODUMP;

	return xflags;
}

STATIC unsigned int
xfs_di2lxflags(
	__uint16_t	di_flags)
{
	unsigned int	flags = 0;

	if (di_flags & XFS_DIFLAG_IMMUTABLE)
		flags |= FS_IMMUTABLE_FL;
	if (di_flags & XFS_DIFLAG_APPEND)
		flags |= FS_APPEND_FL;
	if (di_flags & XFS_DIFLAG_SYNC)
		flags |= FS_SYNC_FL;
	if (di_flags & XFS_DIFLAG_NOATIME)
		flags |= FS_NOATIME_FL;
	if (di_flags & XFS_DIFLAG_NODUMP)
		flags |= FS_NODUMP_FL;
	return flags;
}

STATIC int
xfs_ioc_fsgetxattr(
	xfs_inode_t		*ip,
	int			attr,
	void			__user *arg)
{
	struct fsxattr		fa;

	xfs_ilock(ip, XFS_ILOCK_SHARED);
	fa.fsx_xflags = xfs_ip2xflags(ip);
	fa.fsx_extsize = ip->i_d.di_extsize << ip->i_mount->m_sb.sb_blocklog;
	fa.fsx_projid = ip->i_d.di_projid;

	if (attr) {
		if (ip->i_afp) {
			if (ip->i_afp->if_flags & XFS_IFEXTENTS)
				fa.fsx_nextents = ip->i_afp->if_bytes /
							sizeof(xfs_bmbt_rec_t);
			else
				fa.fsx_nextents = ip->i_d.di_anextents;
		} else
			fa.fsx_nextents = 0;
	} else {
		if (ip->i_df.if_flags & XFS_IFEXTENTS)
			fa.fsx_nextents = ip->i_df.if_bytes /
						sizeof(xfs_bmbt_rec_t);
		else
			fa.fsx_nextents = ip->i_d.di_nextents;
	}
	xfs_iunlock(ip, XFS_ILOCK_SHARED);

	if (copy_to_user(arg, &fa, sizeof(fa)))
		return -EFAULT;
	return 0;
}

STATIC void
xfs_set_diflags(
	struct xfs_inode	*ip,
	unsigned int		xflags)
{
	unsigned int		di_flags;

	/* can't set PREALLOC this way, just preserve it */
	di_flags = (ip->i_d.di_flags & XFS_DIFLAG_PREALLOC);
	if (xflags & XFS_XFLAG_IMMUTABLE)
		di_flags |= XFS_DIFLAG_IMMUTABLE;
	if (xflags & XFS_XFLAG_APPEND)
		di_flags |= XFS_DIFLAG_APPEND;
	if (xflags & XFS_XFLAG_SYNC)
		di_flags |= XFS_DIFLAG_SYNC;
	if (xflags & XFS_XFLAG_NOATIME)
		di_flags |= XFS_DIFLAG_NOATIME;
	if (xflags & XFS_XFLAG_NODUMP)
		di_flags |= XFS_DIFLAG_NODUMP;
	if (xflags & XFS_XFLAG_PROJINHERIT)
		di_flags |= XFS_DIFLAG_PROJINHERIT;
	if (xflags & XFS_XFLAG_NODEFRAG)
		di_flags |= XFS_DIFLAG_NODEFRAG;
	if (xflags & XFS_XFLAG_FILESTREAM)
		di_flags |= XFS_DIFLAG_FILESTREAM;
	if ((ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
		if (xflags & XFS_XFLAG_RTINHERIT)
			di_flags |= XFS_DIFLAG_RTINHERIT;
		if (xflags & XFS_XFLAG_NOSYMLINKS)
			di_flags |= XFS_DIFLAG_NOSYMLINKS;
		if (xflags & XFS_XFLAG_EXTSZINHERIT)
			di_flags |= XFS_DIFLAG_EXTSZINHERIT;
	} else if ((ip->i_d.di_mode & S_IFMT) == S_IFREG) {
		if (xflags & XFS_XFLAG_REALTIME)
			di_flags |= XFS_DIFLAG_REALTIME;
		if (xflags & XFS_XFLAG_EXTSIZE)
			di_flags |= XFS_DIFLAG_EXTSIZE;
	}

	ip->i_d.di_flags = di_flags;
}

STATIC void
xfs_diflags_to_linux(
	struct xfs_inode	*ip)
{
	struct inode		*inode = VFS_I(ip);
	unsigned int		xflags = xfs_ip2xflags(ip);

	if (xflags & XFS_XFLAG_IMMUTABLE)
		inode->i_flags |= S_IMMUTABLE;
	else
		inode->i_flags &= ~S_IMMUTABLE;
	if (xflags & XFS_XFLAG_APPEND)
		inode->i_flags |= S_APPEND;
	else
		inode->i_flags &= ~S_APPEND;
	if (xflags & XFS_XFLAG_SYNC)
		inode->i_flags |= S_SYNC;
	else
		inode->i_flags &= ~S_SYNC;
	if (xflags & XFS_XFLAG_NOATIME)
		inode->i_flags |= S_NOATIME;
	else
		inode->i_flags &= ~S_NOATIME;
}

#define FSX_PROJID	1
#define FSX_EXTSIZE	2
#define FSX_XFLAGS	4
#define FSX_NONBLOCK	8

STATIC int
xfs_ioctl_setattr(
	xfs_inode_t		*ip,
	struct fsxattr		*fa,
	int			mask)
{
	struct xfs_mount	*mp = ip->i_mount;
	struct xfs_trans	*tp;
	unsigned int		lock_flags = 0;
	struct xfs_dquot	*udqp = NULL;
	struct xfs_dquot	*gdqp = NULL;
	struct xfs_dquot	*olddquot = NULL;
	int			code;

	xfs_itrace_entry(ip);

	if (mp->m_flags & XFS_MOUNT_RDONLY)
		return XFS_ERROR(EROFS);
	if (XFS_FORCED_SHUTDOWN(mp))
		return XFS_ERROR(EIO);

	/*
	 * If disk quotas is on, we make sure that the dquots do exist on disk,
	 * before we start any other transactions. Trying to do this later
	 * is messy. We don't care to take a readlock to look at the ids
	 * in inode here, because we can't hold it across the trans_reserve.
	 * If the IDs do change before we take the ilock, we're covered
	 * because the i_*dquot fields will get updated anyway.
	 */
	if (XFS_IS_QUOTA_ON(mp) && (mask & FSX_PROJID)) {
		code = xfs_qm_vop_dqalloc(ip, ip->i_d.di_uid,
					 ip->i_d.di_gid, fa->fsx_projid,
					 XFS_QMOPT_PQUOTA, &udqp, &gdqp);
		if (code)
			return code;
	}

	/*
	 * For the other attributes, we acquire the inode lock and
	 * first do an error checking pass.
	 */
	tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE);
	code = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), 0, 0, 0);
	if (code)
		goto error_return;

	lock_flags = XFS_ILOCK_EXCL;
	xfs_ilock(ip, lock_flags);

	/*
	 * CAP_FOWNER overrides the following restrictions:
	 *
	 * The user ID of the calling process must be equal
	 * to the file owner ID, except in cases where the
	 * CAP_FSETID capability is applicable.
	 */
	if (current_fsuid() != ip->i_d.di_uid && !capable(CAP_FOWNER)) {
		code = XFS_ERROR(EPERM);
		goto error_return;
	}

	/*
	 * Do a quota reservation only if projid is actually going to change.
	 */
	if (mask & FSX_PROJID) {
		if (XFS_IS_QUOTA_RUNNING(mp) &&
		    XFS_IS_PQUOTA_ON(mp) &&
		    ip->i_d.di_projid != fa->fsx_projid) {
			ASSERT(tp);
			code = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp,
						capable(CAP_FOWNER) ?
						XFS_QMOPT_FORCE_RES : 0);
			if (code)	/* out of quota */
				goto error_return;
		}
	}

	if (mask & FSX_EXTSIZE) {
		/*
		 * Can't change extent size if any extents are allocated.
		 */
		if (ip->i_d.di_nextents &&
		    ((ip->i_d.di_extsize << mp->m_sb.sb_blocklog) !=
		     fa->fsx_extsize)) {
			code = XFS_ERROR(EINVAL);	/* EFBIG? */
			goto error_return;
		}

		/*
		 * Extent size must be a multiple of the appropriate block
		 * size, if set at all.
		 */
		if (fa->fsx_extsize != 0) {
			xfs_extlen_t	size;

			if (XFS_IS_REALTIME_INODE(ip) ||
			    ((mask & FSX_XFLAGS) &&
			    (fa->fsx_xflags & XFS_XFLAG_REALTIME))) {
				size = mp->m_sb.sb_rextsize <<
				       mp->m_sb.sb_blocklog;
			} else {
				size = mp->m_sb.sb_blocksize;
			}

			if (fa->fsx_extsize % size) {
				code = XFS_ERROR(EINVAL);
				goto error_return;
			}
		}
	}


	if (mask & FSX_XFLAGS) {
		/*
		 * Can't change realtime flag if any extents are allocated.
		 */
		if ((ip->i_d.di_nextents || ip->i_delayed_blks) &&
		    (XFS_IS_REALTIME_INODE(ip)) !=
		    (fa->fsx_xflags & XFS_XFLAG_REALTIME)) {
			code = XFS_ERROR(EINVAL);	/* EFBIG? */
			goto error_return;
		}

		/*
		 * If realtime flag is set then must have realtime data.
		 */
		if ((fa->fsx_xflags & XFS_XFLAG_REALTIME)) {
			if ((mp->m_sb.sb_rblocks == 0) ||
			    (mp->m_sb.sb_rextsize == 0) ||
			    (ip->i_d.di_extsize % mp->m_sb.sb_rextsize)) {
				code = XFS_ERROR(EINVAL);
				goto error_return;
			}
		}

		/*
		 * Can't modify an immutable/append-only file unless
		 * we have appropriate permission.
		 */
		if ((ip->i_d.di_flags &
				(XFS_DIFLAG_IMMUTABLE|XFS_DIFLAG_APPEND) ||
		     (fa->fsx_xflags &
				(XFS_XFLAG_IMMUTABLE | XFS_XFLAG_APPEND))) &&
		    !capable(CAP_LINUX_IMMUTABLE)) {
			code = XFS_ERROR(EPERM);
			goto error_return;
		}
	}

	xfs_trans_ijoin(tp, ip, lock_flags);
	xfs_trans_ihold(tp, ip);

	/*
	 * Change file ownership.  Must be the owner or privileged.
	 */
	if (mask & FSX_PROJID) {
		/*
		 * CAP_FSETID overrides the following restrictions:
		 *
		 * The set-user-ID and set-group-ID bits of a file will be
		 * cleared upon successful return from chown()
		 */
		if ((ip->i_d.di_mode & (S_ISUID|S_ISGID)) &&
		    !capable(CAP_FSETID))
			ip->i_d.di_mode &= ~(S_ISUID|S_ISGID);

		/*
		 * Change the ownerships and register quota modifications
		 * in the transaction.
		 */
		if (ip->i_d.di_projid != fa->fsx_projid) {
			if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_PQUOTA_ON(mp)) {
				olddquot = xfs_qm_vop_chown(tp, ip,
							&ip->i_gdquot, gdqp);
			}
			ip->i_d.di_projid = fa->fsx_projid;

			/*
			 * We may have to rev the inode as well as
			 * the superblock version number since projids didn't
			 * exist before DINODE_VERSION_2 and SB_VERSION_NLINK.
			 */
			if (ip->i_d.di_version == 1)
				xfs_bump_ino_vers2(tp, ip);
		}

	}

	if (mask & FSX_EXTSIZE)
		ip->i_d.di_extsize = fa->fsx_extsize >> mp->m_sb.sb_blocklog;
	if (mask & FSX_XFLAGS) {
		xfs_set_diflags(ip, fa->fsx_xflags);
		xfs_diflags_to_linux(ip);
	}

	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
	xfs_ichgtime(ip, XFS_ICHGTIME_CHG);

	XFS_STATS_INC(xs_ig_attrchg);

	/*
	 * If this is a synchronous mount, make sure that the
	 * transaction goes to disk before returning to the user.
	 * This is slightly sub-optimal in that truncates require
	 * two sync transactions instead of one for wsync filesystems.
	 * One for the truncate and one for the timestamps since we
	 * don't want to change the timestamps unless we're sure the
	 * truncate worked.  Truncates are less than 1% of the laddis
	 * mix so this probably isn't worth the trouble to optimize.
	 */
	if (mp->m_flags & XFS_MOUNT_WSYNC)
		xfs_trans_set_sync(tp);
	code = xfs_trans_commit(tp, 0);
	xfs_iunlock(ip, lock_flags);

	/*
	 * Release any dquot(s) the inode had kept before chown.
	 */
	xfs_qm_dqrele(olddquot);
	xfs_qm_dqrele(udqp);
	xfs_qm_dqrele(gdqp);

	if (code)
		return code;

	if (DM_EVENT_ENABLED(ip, DM_EVENT_ATTRIBUTE)) {
		XFS_SEND_NAMESP(mp, DM_EVENT_ATTRIBUTE, ip, DM_RIGHT_NULL,
				NULL, DM_RIGHT_NULL, NULL, NULL, 0, 0,
				(mask & FSX_NONBLOCK) ? DM_FLAGS_NDELAY : 0);
	}

	return 0;

 error_return:
	xfs_qm_dqrele(udqp);
	xfs_qm_dqrele(gdqp);
	xfs_trans_cancel(tp, 0);
	if (lock_flags)
		xfs_iunlock(ip, lock_flags);
	return code;
}

STATIC int
xfs_ioc_fssetxattr(
	xfs_inode_t		*ip,
	struct file		*filp,
	void			__user *arg)
{
	struct fsxattr		fa;
	unsigned int		mask;

	if (copy_from_user(&fa, arg, sizeof(fa)))
		return -EFAULT;

	mask = FSX_XFLAGS | FSX_EXTSIZE | FSX_PROJID;
	if (filp->f_flags & (O_NDELAY|O_NONBLOCK))
		mask |= FSX_NONBLOCK;

	return -xfs_ioctl_setattr(ip, &fa, mask);
}

STATIC int
xfs_ioc_getxflags(
	xfs_inode_t		*ip,
	void			__user *arg)
{
	unsigned int		flags;

	flags = xfs_di2lxflags(ip->i_d.di_flags);
	if (copy_to_user(arg, &flags, sizeof(flags)))
		return -EFAULT;
	return 0;
}

STATIC int
xfs_ioc_setxflags(
	xfs_inode_t		*ip,
	struct file		*filp,
	void			__user *arg)
{
	struct fsxattr		fa;
	unsigned int		flags;
	unsigned int		mask;

	if (copy_from_user(&flags, arg, sizeof(flags)))
		return -EFAULT;

	if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
		      FS_NOATIME_FL | FS_NODUMP_FL | \
		      FS_SYNC_FL))
		return -EOPNOTSUPP;

	mask = FSX_XFLAGS;
	if (filp->f_flags & (O_NDELAY|O_NONBLOCK))
		mask |= FSX_NONBLOCK;
	fa.fsx_xflags = xfs_merge_ioc_xflags(flags, xfs_ip2xflags(ip));

	return -xfs_ioctl_setattr(ip, &fa, mask);
}

STATIC int
xfs_getbmap_format(void **ap, struct getbmapx *bmv, int *full)
{
	struct getbmap __user	*base = *ap;

	/* copy only getbmap portion (not getbmapx) */
	if (copy_to_user(base, bmv, sizeof(struct getbmap)))
		return XFS_ERROR(EFAULT);

	*ap += sizeof(struct getbmap);
	return 0;
}

STATIC int
xfs_ioc_getbmap(
	struct xfs_inode	*ip,
	int			ioflags,
	unsigned int		cmd,
	void			__user *arg)
{
	struct getbmapx		bmx;
	int			error;

	if (copy_from_user(&bmx, arg, sizeof(struct getbmapx)))
		return -XFS_ERROR(EFAULT);

	if (bmx.bmv_count < 2)
		return -XFS_ERROR(EINVAL);

	bmx.bmv_iflags = (cmd == XFS_IOC_GETBMAPA ? BMV_IF_ATTRFORK : 0);
	if (ioflags & IO_INVIS)
		bmx.bmv_iflags |= BMV_IF_NO_DMAPI_READ;

	error = xfs_getbmap(ip, &bmx, xfs_getbmap_format,
			    (struct getbmap *)arg+1);
	if (error)
		return -error;

	/* copy back header - only size of getbmap */
	if (copy_to_user(arg, &bmx, sizeof(struct getbmap)))
		return -XFS_ERROR(EFAULT);
	return 0;
}

STATIC int
xfs_getbmapx_format(void **ap, struct getbmapx *bmv, int *full)
{
	struct getbmapx __user	*base = *ap;

	if (copy_to_user(base, bmv, sizeof(struct getbmapx)))
		return XFS_ERROR(EFAULT);

	*ap += sizeof(struct getbmapx);
	return 0;
}

STATIC int
xfs_ioc_getbmapx(
	struct xfs_inode	*ip,
	void			__user *arg)
{
	struct getbmapx		bmx;
	int			error;

	if (copy_from_user(&bmx, arg, sizeof(bmx)))
		return -XFS_ERROR(EFAULT);

	if (bmx.bmv_count < 2)
		return -XFS_ERROR(EINVAL);

	if (bmx.bmv_iflags & (~BMV_IF_VALID))
		return -XFS_ERROR(EINVAL);

	error = xfs_getbmap(ip, &bmx, xfs_getbmapx_format,
			    (struct getbmapx *)arg+1);
	if (error)
		return -error;

	/* copy back header */
	if (copy_to_user(arg, &bmx, sizeof(struct getbmapx)))
		return -XFS_ERROR(EFAULT);

	return 0;
}

/*
 * Note: some of the ioctl's return positive numbers as a
 * byte count indicating success, such as readlink_by_handle.
 * So we don't "sign flip" like most other routines.  This means
 * true errors need to be returned as a negative value.
 */
long
xfs_file_ioctl(
	struct file		*filp,
	unsigned int		cmd,
	unsigned long		p)
{
	struct inode		*inode = filp->f_path.dentry->d_inode;
	struct xfs_inode	*ip = XFS_I(inode);
	struct xfs_mount	*mp = ip->i_mount;
	void			__user *arg = (void __user *)p;
	int			ioflags = 0;
	int			error;

	if (filp->f_mode & FMODE_NOCMTIME)
		ioflags |= IO_INVIS;

	xfs_itrace_entry(ip);

	switch (cmd) {
	case XFS_IOC_ALLOCSP:
	case XFS_IOC_FREESP:
	case XFS_IOC_RESVSP:
	case XFS_IOC_UNRESVSP:
	case XFS_IOC_ALLOCSP64:
	case XFS_IOC_FREESP64:
	case XFS_IOC_RESVSP64:
	case XFS_IOC_UNRESVSP64: {
		xfs_flock64_t		bf;

		if (copy_from_user(&bf, arg, sizeof(bf)))
			return -XFS_ERROR(EFAULT);
		return xfs_ioc_space(ip, inode, filp, ioflags, cmd, &bf);
	}
	case XFS_IOC_DIOINFO: {
		struct dioattr	da;
		xfs_buftarg_t	*target =
			XFS_IS_REALTIME_INODE(ip) ?
			mp->m_rtdev_targp : mp->m_ddev_targp;

		da.d_mem = da.d_miniosz = 1 << target->bt_sshift;
		da.d_maxiosz = INT_MAX & ~(da.d_miniosz - 1);

		if (copy_to_user(arg, &da, sizeof(da)))
			return -XFS_ERROR(EFAULT);
		return 0;
	}

	case XFS_IOC_FSBULKSTAT_SINGLE:
	case XFS_IOC_FSBULKSTAT:
	case XFS_IOC_FSINUMBERS:
		return xfs_ioc_bulkstat(mp, cmd, arg);

	case XFS_IOC_FSGEOMETRY_V1:
		return xfs_ioc_fsgeometry_v1(mp, arg);

	case XFS_IOC_FSGEOMETRY:
		return xfs_ioc_fsgeometry(mp, arg);

	case XFS_IOC_GETVERSION:
		return put_user(inode->i_generation, (int __user *)arg);

	case XFS_IOC_FSGETXATTR:
		return xfs_ioc_fsgetxattr(ip, 0, arg);
	case XFS_IOC_FSGETXATTRA:
		return xfs_ioc_fsgetxattr(ip, 1, arg);
	case XFS_IOC_FSSETXATTR:
		return xfs_ioc_fssetxattr(ip, filp, arg);
	case XFS_IOC_GETXFLAGS:
		return xfs_ioc_getxflags(ip, arg);
	case XFS_IOC_SETXFLAGS:
		return xfs_ioc_setxflags(ip, filp, arg);

	case XFS_IOC_FSSETDM: {
		struct fsdmidata	dmi;

		if (copy_from_user(&dmi, arg, sizeof(dmi)))
			return -XFS_ERROR(EFAULT);

		error = xfs_set_dmattrs(ip, dmi.fsd_dmevmask,
				dmi.fsd_dmstate);
		return -error;
	}

	case XFS_IOC_GETBMAP:
	case XFS_IOC_GETBMAPA:
		return xfs_ioc_getbmap(ip, ioflags, cmd, arg);

	case XFS_IOC_GETBMAPX:
		return xfs_ioc_getbmapx(ip, arg);

	case XFS_IOC_FD_TO_HANDLE:
	case XFS_IOC_PATH_TO_HANDLE:
	case XFS_IOC_PATH_TO_FSHANDLE: {
		xfs_fsop_handlereq_t	hreq;

		if (copy_from_user(&hreq, arg, sizeof(hreq)))
			return -XFS_ERROR(EFAULT);
		return xfs_find_handle(cmd, &hreq);
	}
	case XFS_IOC_OPEN_BY_HANDLE: {
		xfs_fsop_handlereq_t	hreq;

		if (copy_from_user(&hreq, arg, sizeof(xfs_fsop_handlereq_t)))
			return -XFS_ERROR(EFAULT);
		return xfs_open_by_handle(filp, &hreq);
	}
	case XFS_IOC_FSSETDM_BY_HANDLE:
		return xfs_fssetdm_by_handle(filp, arg);

	case XFS_IOC_READLINK_BY_HANDLE: {
		xfs_fsop_handlereq_t	hreq;

		if (copy_from_user(&hreq, arg, sizeof(xfs_fsop_handlereq_t)))
			return -XFS_ERROR(EFAULT);
		return xfs_readlink_by_handle(filp, &hreq);
	}
	case XFS_IOC_ATTRLIST_BY_HANDLE:
		return xfs_attrlist_by_handle(filp, arg);

	case XFS_IOC_ATTRMULTI_BY_HANDLE:
		return xfs_attrmulti_by_handle(filp, arg);

	case XFS_IOC_SWAPEXT: {
		struct xfs_swapext	sxp;

		if (copy_from_user(&sxp, arg, sizeof(xfs_swapext_t)))
			return -XFS_ERROR(EFAULT);
		error = xfs_swapext(&sxp);
		return -error;
	}

	case XFS_IOC_FSCOUNTS: {
		xfs_fsop_counts_t out;

		error = xfs_fs_counts(mp, &out);
		if (error)
			return -error;

		if (copy_to_user(arg, &out, sizeof(out)))
			return -XFS_ERROR(EFAULT);
		return 0;
	}

	case XFS_IOC_SET_RESBLKS: {
		xfs_fsop_resblks_t inout;
		__uint64_t	   in;

		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;

		if (mp->m_flags & XFS_MOUNT_RDONLY)
			return -XFS_ERROR(EROFS);

		if (copy_from_user(&inout, arg, sizeof(inout)))
			return -XFS_ERROR(EFAULT);

		/* input parameter is passed in resblks field of structure */
		in = inout.resblks;
		error = xfs_reserve_blocks(mp, &in, &inout);
		if (error)
			return -error;

		if (copy_to_user(arg, &inout, sizeof(inout)))
			return -XFS_ERROR(EFAULT);
		return 0;
	}

	case XFS_IOC_GET_RESBLKS: {
		xfs_fsop_resblks_t out;

		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;

		error = xfs_reserve_blocks(mp, NULL, &out);
		if (error)
			return -error;

		if (copy_to_user(arg, &out, sizeof(out)))
			return -XFS_ERROR(EFAULT);

		return 0;
	}

	case XFS_IOC_FSGROWFSDATA: {
		xfs_growfs_data_t in;

		if (copy_from_user(&in, arg, sizeof(in)))
			return -XFS_ERROR(EFAULT);

		error = xfs_growfs_data(mp, &in);
		return -error;
	}

	case XFS_IOC_FSGROWFSLOG: {
		xfs_growfs_log_t in;

		if (copy_from_user(&in, arg, sizeof(in)))
			return -XFS_ERROR(EFAULT);

		error = xfs_growfs_log(mp, &in);
		return -error;
	}

	case XFS_IOC_FSGROWFSRT: {
		xfs_growfs_rt_t in;

		if (copy_from_user(&in, arg, sizeof(in)))
			return -XFS_ERROR(EFAULT);

		error = xfs_growfs_rt(mp, &in);
		return -error;
	}

	case XFS_IOC_GOINGDOWN: {
		__uint32_t in;

		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;

		if (get_user(in, (__uint32_t __user *)arg))
			return -XFS_ERROR(EFAULT);

		error = xfs_fs_goingdown(mp, in);
		return -error;
	}

	case XFS_IOC_ERROR_INJECTION: {
		xfs_error_injection_t in;

		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;

		if (copy_from_user(&in, arg, sizeof(in)))
			return -XFS_ERROR(EFAULT);

		error = xfs_errortag_add(in.errtag, mp);
		return -error;
	}

	case XFS_IOC_ERROR_CLEARALL:
		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;

		error = xfs_errortag_clearall(mp, 1);
		return -error;

	default:
		return -ENOTTY;
	}
}