aboutsummaryrefslogtreecommitdiff
path: root/fs/ioctl.c
blob: 76cf22ac97d76256104a6dbc4f819247168ce769 (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
// SPDX-License-Identifier: GPL-2.0
/*
 *  linux/fs/ioctl.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 */

#include <linux/syscalls.h>
#include <linux/mm.h>
#include <linux/capability.h>
#include <linux/compat.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/security.h>
#include <linux/export.h>
#include <linux/uaccess.h>
#include <linux/writeback.h>
#include <linux/buffer_head.h>
#include <linux/falloc.h>
#include <linux/sched/signal.h>
#include <linux/fiemap.h>
#include <linux/mount.h>
#include <linux/fscrypt.h>
#include <linux/fileattr.h>

#include "internal.h"

#include <asm/ioctls.h>

/* So that the fiemap access checks can't overflow on 32 bit machines. */
#define FIEMAP_MAX_EXTENTS	(UINT_MAX / sizeof(struct fiemap_extent))

/**
 * vfs_ioctl - call filesystem specific ioctl methods
 * @filp:	open file to invoke ioctl method on
 * @cmd:	ioctl command to execute
 * @arg:	command-specific argument for ioctl
 *
 * Invokes filesystem specific ->unlocked_ioctl, if one exists; otherwise
 * returns -ENOTTY.
 *
 * Returns 0 on success, -errno on error.
 */
long vfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
	int error = -ENOTTY;

	if (!filp->f_op->unlocked_ioctl)
		goto out;

	error = filp->f_op->unlocked_ioctl(filp, cmd, arg);
	if (error == -ENOIOCTLCMD)
		error = -ENOTTY;
 out:
	return error;
}
EXPORT_SYMBOL(vfs_ioctl);

static int ioctl_fibmap(struct file *filp, int __user *p)
{
	struct inode *inode = file_inode(filp);
	struct super_block *sb = inode->i_sb;
	int error, ur_block;
	sector_t block;

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

	error = get_user(ur_block, p);
	if (error)
		return error;

	if (ur_block < 0)
		return -EINVAL;

	block = ur_block;
	error = bmap(inode, &block);

	if (block > INT_MAX) {
		error = -ERANGE;
		pr_warn_ratelimited("[%s/%d] FS: %s File: %pD4 would truncate fibmap result\n",
				    current->comm, task_pid_nr(current),
				    sb->s_id, filp);
	}

	if (error)
		ur_block = 0;
	else
		ur_block = block;

	if (put_user(ur_block, p))
		error = -EFAULT;

	return error;
}

/**
 * fiemap_fill_next_extent - Fiemap helper function
 * @fieinfo:	Fiemap context passed into ->fiemap
 * @logical:	Extent logical start offset, in bytes
 * @phys:	Extent physical start offset, in bytes
 * @len:	Extent length, in bytes
 * @flags:	FIEMAP_EXTENT flags that describe this extent
 *
 * Called from file system ->fiemap callback. Will populate extent
 * info as passed in via arguments and copy to user memory. On
 * success, extent count on fieinfo is incremented.
 *
 * Returns 0 on success, -errno on error, 1 if this was the last
 * extent that will fit in user array.
 */
int fiemap_fill_next_extent(struct fiemap_extent_info *fieinfo, u64 logical,
			    u64 phys, u64 len, u32 flags)
{
	struct fiemap_extent extent;
	struct fiemap_extent __user *dest = fieinfo->fi_extents_start;

	/* only count the extents */
	if (fieinfo->fi_extents_max == 0) {
		fieinfo->fi_extents_mapped++;
		return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
	}

	if (fieinfo->fi_extents_mapped >= fieinfo->fi_extents_max)
		return 1;

#define SET_UNKNOWN_FLAGS	(FIEMAP_EXTENT_DELALLOC)
#define SET_NO_UNMOUNTED_IO_FLAGS	(FIEMAP_EXTENT_DATA_ENCRYPTED)
#define SET_NOT_ALIGNED_FLAGS	(FIEMAP_EXTENT_DATA_TAIL|FIEMAP_EXTENT_DATA_INLINE)

	if (flags & SET_UNKNOWN_FLAGS)
		flags |= FIEMAP_EXTENT_UNKNOWN;
	if (flags & SET_NO_UNMOUNTED_IO_FLAGS)
		flags |= FIEMAP_EXTENT_ENCODED;
	if (flags & SET_NOT_ALIGNED_FLAGS)
		flags |= FIEMAP_EXTENT_NOT_ALIGNED;

	memset(&extent, 0, sizeof(extent));
	extent.fe_logical = logical;
	extent.fe_physical = phys;
	extent.fe_length = len;
	extent.fe_flags = flags;

	dest += fieinfo->fi_extents_mapped;
	if (copy_to_user(dest, &extent, sizeof(extent)))
		return -EFAULT;

	fieinfo->fi_extents_mapped++;
	if (fieinfo->fi_extents_mapped == fieinfo->fi_extents_max)
		return 1;
	return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
}
EXPORT_SYMBOL(fiemap_fill_next_extent);

/**
 * fiemap_prep - check validity of requested flags for fiemap
 * @inode:	Inode to operate on
 * @fieinfo:	Fiemap context passed into ->fiemap
 * @start:	Start of the mapped range
 * @len:	Length of the mapped range, can be truncated by this function.
 * @supported_flags:	Set of fiemap flags that the file system understands
 *
 * This function must be called from each ->fiemap instance to validate the
 * fiemap request against the file system parameters.
 *
 * Returns 0 on success, or a negative error on failure.
 */
int fiemap_prep(struct inode *inode, struct fiemap_extent_info *fieinfo,
		u64 start, u64 *len, u32 supported_flags)
{
	u64 maxbytes = inode->i_sb->s_maxbytes;
	u32 incompat_flags;
	int ret = 0;

	if (*len == 0)
		return -EINVAL;
	if (start >= maxbytes)
		return -EFBIG;

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

	supported_flags |= FIEMAP_FLAG_SYNC;
	supported_flags &= FIEMAP_FLAGS_COMPAT;
	incompat_flags = fieinfo->fi_flags & ~supported_flags;
	if (incompat_flags) {
		fieinfo->fi_flags = incompat_flags;
		return -EBADR;
	}

	if (fieinfo->fi_flags & FIEMAP_FLAG_SYNC)
		ret = filemap_write_and_wait(inode->i_mapping);
	return ret;
}
EXPORT_SYMBOL(fiemap_prep);

static int ioctl_fiemap(struct file *filp, struct fiemap __user *ufiemap)
{
	struct fiemap fiemap;
	struct fiemap_extent_info fieinfo = { 0, };
	struct inode *inode = file_inode(filp);
	int error;

	if (!inode->i_op->fiemap)
		return -EOPNOTSUPP;

	if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap)))
		return -EFAULT;

	if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
		return -EINVAL;

	fieinfo.fi_flags = fiemap.fm_flags;
	fieinfo.fi_extents_max = fiemap.fm_extent_count;
	fieinfo.fi_extents_start = ufiemap->fm_extents;

	error = inode->i_op->fiemap(inode, &fieinfo, fiemap.fm_start,
			fiemap.fm_length);

	fiemap.fm_flags = fieinfo.fi_flags;
	fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
	if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap)))
		error = -EFAULT;

	return error;
}

static long ioctl_file_clone(struct file *dst_file, unsigned long srcfd,
			     u64 off, u64 olen, u64 destoff)
{
	struct fd src_file = fdget(srcfd);
	loff_t cloned;
	int ret;

	if (!src_file.file)
		return -EBADF;
	cloned = vfs_clone_file_range(src_file.file, off, dst_file, destoff,
				      olen, 0);
	if (cloned < 0)
		ret = cloned;
	else if (olen && cloned != olen)
		ret = -EINVAL;
	else
		ret = 0;
	fdput(src_file);
	return ret;
}

static long ioctl_file_clone_range(struct file *file,
				   struct file_clone_range __user *argp)
{
	struct file_clone_range args;

	if (copy_from_user(&args, argp, sizeof(args)))
		return -EFAULT;
	return ioctl_file_clone(file, args.src_fd, args.src_offset,
				args.src_length, args.dest_offset);
}

/*
 * This provides compatibility with legacy XFS pre-allocation ioctls
 * which predate the fallocate syscall.
 *
 * Only the l_start, l_len and l_whence fields of the 'struct space_resv'
 * are used here, rest are ignored.
 */
static int ioctl_preallocate(struct file *filp, int mode, void __user *argp)
{
	struct inode *inode = file_inode(filp);
	struct space_resv sr;

	if (copy_from_user(&sr, argp, sizeof(sr)))
		return -EFAULT;

	switch (sr.l_whence) {
	case SEEK_SET:
		break;
	case SEEK_CUR:
		sr.l_start += filp->f_pos;
		break;
	case SEEK_END:
		sr.l_start += i_size_read(inode);
		break;
	default:
		return -EINVAL;
	}

	return vfs_fallocate(filp, mode | FALLOC_FL_KEEP_SIZE, sr.l_start,
			sr.l_len);
}

/* on ia32 l_start is on a 32-bit boundary */
#if defined CONFIG_COMPAT && defined(CONFIG_X86_64)
/* just account for different alignment */
static int compat_ioctl_preallocate(struct file *file, int mode,
				    struct space_resv_32 __user *argp)
{
	struct inode *inode = file_inode(file);
	struct space_resv_32 sr;

	if (copy_from_user(&sr, argp, sizeof(sr)))
		return -EFAULT;

	switch (sr.l_whence) {
	case SEEK_SET:
		break;
	case SEEK_CUR:
		sr.l_start += file->f_pos;
		break;
	case SEEK_END:
		sr.l_start += i_size_read(inode);
		break;
	default:
		return -EINVAL;
	}

	return vfs_fallocate(file, mode | FALLOC_FL_KEEP_SIZE, sr.l_start, sr.l_len);
}
#endif

static int file_ioctl(struct file *filp, unsigned int cmd, int __user *p)
{
	switch (cmd) {
	case FIBMAP:
		return ioctl_fibmap(filp, p);
	case FS_IOC_RESVSP:
	case FS_IOC_RESVSP64:
		return ioctl_preallocate(filp, 0, p);
	case FS_IOC_UNRESVSP:
	case FS_IOC_UNRESVSP64:
		return ioctl_preallocate(filp, FALLOC_FL_PUNCH_HOLE, p);
	case FS_IOC_ZERO_RANGE:
		return ioctl_preallocate(filp, FALLOC_FL_ZERO_RANGE, p);
	}

	return -ENOIOCTLCMD;
}

static int ioctl_fionbio(struct file *filp, int __user *argp)
{
	unsigned int flag;
	int on, error;

	error = get_user(on, argp);
	if (error)
		return error;
	flag = O_NONBLOCK;
#ifdef __sparc__
	/* SunOS compatibility item. */
	if (O_NONBLOCK != O_NDELAY)
		flag |= O_NDELAY;
#endif
	spin_lock(&filp->f_lock);
	if (on)
		filp->f_flags |= flag;
	else
		filp->f_flags &= ~flag;
	spin_unlock(&filp->f_lock);
	return error;
}

static int ioctl_fioasync(unsigned int fd, struct file *filp,
			  int __user *argp)
{
	unsigned int flag;
	int on, error;

	error = get_user(on, argp);
	if (error)
		return error;
	flag = on ? FASYNC : 0;

	/* Did FASYNC state change ? */
	if ((flag ^ filp->f_flags) & FASYNC) {
		if (filp->f_op->fasync)
			/* fasync() adjusts filp->f_flags */
			error = filp->f_op->fasync(fd, filp, on);
		else
			error = -ENOTTY;
	}
	return error < 0 ? error : 0;
}

static int ioctl_fsfreeze(struct file *filp)
{
	struct super_block *sb = file_inode(filp)->i_sb;

	if (!ns_capable(sb->s_user_ns, CAP_SYS_ADMIN))
		return -EPERM;

	/* If filesystem doesn't support freeze feature, return. */
	if (sb->s_op->freeze_fs == NULL && sb->s_op->freeze_super == NULL)
		return -EOPNOTSUPP;

	/* Freeze */
	if (sb->s_op->freeze_super)
		return sb->s_op->freeze_super(sb, FREEZE_HOLDER_USERSPACE);
	return freeze_super(sb, FREEZE_HOLDER_USERSPACE);
}

static int ioctl_fsthaw(struct file *filp)
{
	struct super_block *sb = file_inode(filp)->i_sb;

	if (!ns_capable(sb->s_user_ns, CAP_SYS_ADMIN))
		return -EPERM;

	/* Thaw */
	if (sb->s_op->thaw_super)
		return sb->s_op->thaw_super(sb, FREEZE_HOLDER_USERSPACE);
	return thaw_super(sb, FREEZE_HOLDER_USERSPACE);
}

static int ioctl_file_dedupe_range(struct file *file,
				   struct file_dedupe_range __user *argp)
{
	struct file_dedupe_range *same = NULL;
	int ret;
	unsigned long size;
	u16 count;

	if (get_user(count, &argp->dest_count)) {
		ret = -EFAULT;
		goto out;
	}

	size = offsetof(struct file_dedupe_range, info[count]);
	if (size > PAGE_SIZE) {
		ret = -ENOMEM;
		goto out;
	}

	same = memdup_user(argp, size);
	if (IS_ERR(same)) {
		ret = PTR_ERR(same);
		same = NULL;
		goto out;
	}

	same->dest_count = count;
	ret = vfs_dedupe_file_range(file, same);
	if (ret)
		goto out;

	ret = copy_to_user(argp, same, size);
	if (ret)
		ret = -EFAULT;

out:
	kfree(same);
	return ret;
}

/**
 * fileattr_fill_xflags - initialize fileattr with xflags
 * @fa:		fileattr pointer
 * @xflags:	FS_XFLAG_* flags
 *
 * Set ->fsx_xflags, ->fsx_valid and ->flags (translated xflags).  All
 * other fields are zeroed.
 */
void fileattr_fill_xflags(struct fileattr *fa, u32 xflags)
{
	memset(fa, 0, sizeof(*fa));
	fa->fsx_valid = true;
	fa->fsx_xflags = xflags;
	if (fa->fsx_xflags & FS_XFLAG_IMMUTABLE)
		fa->flags |= FS_IMMUTABLE_FL;
	if (fa->fsx_xflags & FS_XFLAG_APPEND)
		fa->flags |= FS_APPEND_FL;
	if (fa->fsx_xflags & FS_XFLAG_SYNC)
		fa->flags |= FS_SYNC_FL;
	if (fa->fsx_xflags & FS_XFLAG_NOATIME)
		fa->flags |= FS_NOATIME_FL;
	if (fa->fsx_xflags & FS_XFLAG_NODUMP)
		fa->flags |= FS_NODUMP_FL;
	if (fa->fsx_xflags & FS_XFLAG_DAX)
		fa->flags |= FS_DAX_FL;
	if (fa->fsx_xflags & FS_XFLAG_PROJINHERIT)
		fa->flags |= FS_PROJINHERIT_FL;
}
EXPORT_SYMBOL(fileattr_fill_xflags);

/**
 * fileattr_fill_flags - initialize fileattr with flags
 * @fa:		fileattr pointer
 * @flags:	FS_*_FL flags
 *
 * Set ->flags, ->flags_valid and ->fsx_xflags (translated flags).
 * All other fields are zeroed.
 */
void fileattr_fill_flags(struct fileattr *fa, u32 flags)
{
	memset(fa, 0, sizeof(*fa));
	fa->flags_valid = true;
	fa->flags = flags;
	if (fa->flags & FS_SYNC_FL)
		fa->fsx_xflags |= FS_XFLAG_SYNC;
	if (fa->flags & FS_IMMUTABLE_FL)
		fa->fsx_xflags |= FS_XFLAG_IMMUTABLE;
	if (fa->flags & FS_APPEND_FL)
		fa->fsx_xflags |= FS_XFLAG_APPEND;
	if (fa->flags & FS_NODUMP_FL)
		fa->fsx_xflags |= FS_XFLAG_NODUMP;
	if (fa->flags & FS_NOATIME_FL)
		fa->fsx_xflags |= FS_XFLAG_NOATIME;
	if (fa->flags & FS_DAX_FL)
		fa->fsx_xflags |= FS_XFLAG_DAX;
	if (fa->flags & FS_PROJINHERIT_FL)
		fa->fsx_xflags |= FS_XFLAG_PROJINHERIT;
}
EXPORT_SYMBOL(fileattr_fill_flags);

/**
 * vfs_fileattr_get - retrieve miscellaneous file attributes
 * @dentry:	the object to retrieve from
 * @fa:		fileattr pointer
 *
 * Call i_op->fileattr_get() callback, if exists.
 *
 * Return: 0 on success, or a negative error on failure.
 */
int vfs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
{
	struct inode *inode = d_inode(dentry);

	if (!inode->i_op->fileattr_get)
		return -ENOIOCTLCMD;

	return inode->i_op->fileattr_get(dentry, fa);
}
EXPORT_SYMBOL(vfs_fileattr_get);

/**
 * copy_fsxattr_to_user - copy fsxattr to userspace.
 * @fa:		fileattr pointer
 * @ufa:	fsxattr user pointer
 *
 * Return: 0 on success, or -EFAULT on failure.
 */
int copy_fsxattr_to_user(const struct fileattr *fa, struct fsxattr __user *ufa)
{
	struct fsxattr xfa;

	memset(&xfa, 0, sizeof(xfa));
	xfa.fsx_xflags = fa->fsx_xflags;
	xfa.fsx_extsize = fa->fsx_extsize;
	xfa.fsx_nextents = fa->fsx_nextents;
	xfa.fsx_projid = fa->fsx_projid;
	xfa.fsx_cowextsize = fa->fsx_cowextsize;

	if (copy_to_user(ufa, &xfa, sizeof(xfa)))
		return -EFAULT;

	return 0;
}
EXPORT_SYMBOL(copy_fsxattr_to_user);

static int copy_fsxattr_from_user(struct fileattr *fa,
				  struct fsxattr __user *ufa)
{
	struct fsxattr xfa;

	if (copy_from_user(&xfa, ufa, sizeof(xfa)))
		return -EFAULT;

	fileattr_fill_xflags(fa, xfa.fsx_xflags);
	fa->fsx_extsize = xfa.fsx_extsize;
	fa->fsx_nextents = xfa.fsx_nextents;
	fa->fsx_projid = xfa.fsx_projid;
	fa->fsx_cowextsize = xfa.fsx_cowextsize;

	return 0;
}

/*
 * Generic function to check FS_IOC_FSSETXATTR/FS_IOC_SETFLAGS values and reject
 * any invalid configurations.
 *
 * Note: must be called with inode lock held.
 */
static int fileattr_set_prepare(struct inode *inode,
			      const struct fileattr *old_ma,
			      struct fileattr *fa)
{
	int err;

	/*
	 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
	 * the relevant capability.
	 */
	if ((fa->flags ^ old_ma->flags) & (FS_APPEND_FL | FS_IMMUTABLE_FL) &&
	    !capable(CAP_LINUX_IMMUTABLE))
		return -EPERM;

	err = fscrypt_prepare_setflags(inode, old_ma->flags, fa->flags);
	if (err)
		return err;

	/*
	 * Project Quota ID state is only allowed to change from within the init
	 * namespace. Enforce that restriction only if we are trying to change
	 * the quota ID state. Everything else is allowed in user namespaces.
	 */
	if (current_user_ns() != &init_user_ns) {
		if (old_ma->fsx_projid != fa->fsx_projid)
			return -EINVAL;
		if ((old_ma->fsx_xflags ^ fa->fsx_xflags) &
				FS_XFLAG_PROJINHERIT)
			return -EINVAL;
	} else {
		/*
		 * Caller is allowed to change the project ID. If it is being
		 * changed, make sure that the new value is valid.
		 */
		if (old_ma->fsx_projid != fa->fsx_projid &&
		    !projid_valid(make_kprojid(&init_user_ns, fa->fsx_projid)))
			return -EINVAL;
	}

	/* Check extent size hints. */
	if ((fa->fsx_xflags & FS_XFLAG_EXTSIZE) && !S_ISREG(inode->i_mode))
		return -EINVAL;

	if ((fa->fsx_xflags & FS_XFLAG_EXTSZINHERIT) &&
			!S_ISDIR(inode->i_mode))
		return -EINVAL;

	if ((fa->fsx_xflags & FS_XFLAG_COWEXTSIZE) &&
	    !S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode))
		return -EINVAL;

	/*
	 * It is only valid to set the DAX flag on regular files and
	 * directories on filesystems.
	 */
	if ((fa->fsx_xflags & FS_XFLAG_DAX) &&
	    !(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)))
		return -EINVAL;

	/* Extent size hints of zero turn off the flags. */
	if (fa->fsx_extsize == 0)
		fa->fsx_xflags &= ~(FS_XFLAG_EXTSIZE | FS_XFLAG_EXTSZINHERIT);
	if (fa->fsx_cowextsize == 0)
		fa->fsx_xflags &= ~FS_XFLAG_COWEXTSIZE;

	return 0;
}

/**
 * vfs_fileattr_set - change miscellaneous file attributes
 * @idmap:	idmap of the mount
 * @dentry:	the object to change
 * @fa:		fileattr pointer
 *
 * After verifying permissions, call i_op->fileattr_set() callback, if
 * exists.
 *
 * Verifying attributes involves retrieving current attributes with
 * i_op->fileattr_get(), this also allows initializing attributes that have
 * not been set by the caller to current values.  Inode lock is held
 * thoughout to prevent racing with another instance.
 *
 * Return: 0 on success, or a negative error on failure.
 */
int vfs_fileattr_set(struct mnt_idmap *idmap, struct dentry *dentry,
		     struct fileattr *fa)
{
	struct inode *inode = d_inode(dentry);
	struct fileattr old_ma = {};
	int err;

	if (!inode->i_op->fileattr_set)
		return -ENOIOCTLCMD;

	if (!inode_owner_or_capable(idmap, inode))
		return -EPERM;

	inode_lock(inode);
	err = vfs_fileattr_get(dentry, &old_ma);
	if (!err) {
		/* initialize missing bits from old_ma */
		if (fa->flags_valid) {
			fa->fsx_xflags |= old_ma.fsx_xflags & ~FS_XFLAG_COMMON;
			fa->fsx_extsize = old_ma.fsx_extsize;
			fa->fsx_nextents = old_ma.fsx_nextents;
			fa->fsx_projid = old_ma.fsx_projid;
			fa->fsx_cowextsize = old_ma.fsx_cowextsize;
		} else {
			fa->flags |= old_ma.flags & ~FS_COMMON_FL;
		}
		err = fileattr_set_prepare(inode, &old_ma, fa);
		if (!err)
			err = inode->i_op->fileattr_set(idmap, dentry, fa);
	}
	inode_unlock(inode);

	return err;
}
EXPORT_SYMBOL(vfs_fileattr_set);

static int ioctl_getflags(struct file *file, unsigned int __user *argp)
{
	struct fileattr fa = { .flags_valid = true }; /* hint only */
	int err;

	err = vfs_fileattr_get(file->f_path.dentry, &fa);
	if (!err)
		err = put_user(fa.flags, argp);
	return err;
}

static int ioctl_setflags(struct file *file, unsigned int __user *argp)
{
	struct mnt_idmap *idmap = file_mnt_idmap(file);
	struct dentry *dentry = file->f_path.dentry;
	struct fileattr fa;
	unsigned int flags;
	int err;

	err = get_user(flags, argp);
	if (!err) {
		err = mnt_want_write_file(file);
		if (!err) {
			fileattr_fill_flags(&fa, flags);
			err = vfs_fileattr_set(idmap, dentry, &fa);
			mnt_drop_write_file(file);
		}
	}
	return err;
}

static int ioctl_fsgetxattr(struct file *file, void __user *argp)
{
	struct fileattr fa = { .fsx_valid = true }; /* hint only */
	int err;

	err = vfs_fileattr_get(file->f_path.dentry, &fa);
	if (!err)
		err = copy_fsxattr_to_user(&fa, argp);

	return err;
}

static int ioctl_fssetxattr(struct file *file, void __user *argp)
{
	struct mnt_idmap *idmap = file_mnt_idmap(file);
	struct dentry *dentry = file->f_path.dentry;
	struct fileattr fa;
	int err;

	err = copy_fsxattr_from_user(&fa, argp);
	if (!err) {
		err = mnt_want_write_file(file);
		if (!err) {
			err = vfs_fileattr_set(idmap, dentry, &fa);
			mnt_drop_write_file(file);
		}
	}
	return err;
}

/*
 * do_vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d.
 * It's just a simple helper for sys_ioctl and compat_sys_ioctl.
 *
 * When you add any new common ioctls to the switches above and below,
 * please ensure they have compatible arguments in compat mode.
 */
static int do_vfs_ioctl(struct file *filp, unsigned int fd,
			unsigned int cmd, unsigned long arg)
{
	void __user *argp = (void __user *)arg;
	struct inode *inode = file_inode(filp);

	switch (cmd) {
	case FIOCLEX:
		set_close_on_exec(fd, 1);
		return 0;

	case FIONCLEX:
		set_close_on_exec(fd, 0);
		return 0;

	case FIONBIO:
		return ioctl_fionbio(filp, argp);

	case FIOASYNC:
		return ioctl_fioasync(fd, filp, argp);

	case FIOQSIZE:
		if (S_ISDIR(inode->i_mode) || S_ISREG(inode->i_mode) ||
		    S_ISLNK(inode->i_mode)) {
			loff_t res = inode_get_bytes(inode);
			return copy_to_user(argp, &res, sizeof(res)) ?
					    -EFAULT : 0;
		}

		return -ENOTTY;

	case FIFREEZE:
		return ioctl_fsfreeze(filp);

	case FITHAW:
		return ioctl_fsthaw(filp);

	case FS_IOC_FIEMAP:
		return ioctl_fiemap(filp, argp);

	case FIGETBSZ:
		/* anon_bdev filesystems may not have a block size */
		if (!inode->i_sb->s_blocksize)
			return -EINVAL;

		return put_user(inode->i_sb->s_blocksize, (int __user *)argp);

	case FICLONE:
		return ioctl_file_clone(filp, arg, 0, 0, 0);

	case FICLONERANGE:
		return ioctl_file_clone_range(filp, argp);

	case FIDEDUPERANGE:
		return ioctl_file_dedupe_range(filp, argp);

	case FIONREAD:
		if (!S_ISREG(inode->i_mode))
			return vfs_ioctl(filp, cmd, arg);

		return put_user(i_size_read(inode) - filp->f_pos,
				(int __user *)argp);

	case FS_IOC_GETFLAGS:
		return ioctl_getflags(filp, argp);

	case FS_IOC_SETFLAGS:
		return ioctl_setflags(filp, argp);

	case FS_IOC_FSGETXATTR:
		return ioctl_fsgetxattr(filp, argp);

	case FS_IOC_FSSETXATTR:
		return ioctl_fssetxattr(filp, argp);

	default:
		if (S_ISREG(inode->i_mode))
			return file_ioctl(filp, cmd, argp);
		break;
	}

	return -ENOIOCTLCMD;
}

SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd, unsigned long, arg)
{
	struct fd f = fdget(fd);
	int error;

	if (!f.file)
		return -EBADF;

	error = security_file_ioctl(f.file, cmd, arg);
	if (error)
		goto out;

	error = do_vfs_ioctl(f.file, fd, cmd, arg);
	if (error == -ENOIOCTLCMD)
		error = vfs_ioctl(f.file, cmd, arg);

out:
	fdput(f);
	return error;
}

#ifdef CONFIG_COMPAT
/**
 * compat_ptr_ioctl - generic implementation of .compat_ioctl file operation
 * @file: The file to operate on.
 * @cmd: The ioctl command number.
 * @arg: The argument to the ioctl.
 *
 * This is not normally called as a function, but instead set in struct
 * file_operations as
 *
 *     .compat_ioctl = compat_ptr_ioctl,
 *
 * On most architectures, the compat_ptr_ioctl() just passes all arguments
 * to the corresponding ->ioctl handler. The exception is arch/s390, where
 * compat_ptr() clears the top bit of a 32-bit pointer value, so user space
 * pointers to the second 2GB alias the first 2GB, as is the case for
 * native 32-bit s390 user space.
 *
 * The compat_ptr_ioctl() function must therefore be used only with ioctl
 * functions that either ignore the argument or pass a pointer to a
 * compatible data type.
 *
 * If any ioctl command handled by fops->unlocked_ioctl passes a plain
 * integer instead of a pointer, or any of the passed data types
 * is incompatible between 32-bit and 64-bit architectures, a proper
 * handler is required instead of compat_ptr_ioctl.
 */
long compat_ptr_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	if (!file->f_op->unlocked_ioctl)
		return -ENOIOCTLCMD;

	return file->f_op->unlocked_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
}
EXPORT_SYMBOL(compat_ptr_ioctl);

COMPAT_SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd,
		       compat_ulong_t, arg)
{
	struct fd f = fdget(fd);
	int error;

	if (!f.file)
		return -EBADF;

	error = security_file_ioctl_compat(f.file, cmd, arg);
	if (error)
		goto out;

	switch (cmd) {
	/* FICLONE takes an int argument, so don't use compat_ptr() */
	case FICLONE:
		error = ioctl_file_clone(f.file, arg, 0, 0, 0);
		break;

#if defined(CONFIG_X86_64)
	/* these get messy on amd64 due to alignment differences */
	case FS_IOC_RESVSP_32:
	case FS_IOC_RESVSP64_32:
		error = compat_ioctl_preallocate(f.file, 0, compat_ptr(arg));
		break;
	case FS_IOC_UNRESVSP_32:
	case FS_IOC_UNRESVSP64_32:
		error = compat_ioctl_preallocate(f.file, FALLOC_FL_PUNCH_HOLE,
				compat_ptr(arg));
		break;
	case FS_IOC_ZERO_RANGE_32:
		error = compat_ioctl_preallocate(f.file, FALLOC_FL_ZERO_RANGE,
				compat_ptr(arg));
		break;
#endif

	/*
	 * These access 32-bit values anyway so no further handling is
	 * necessary.
	 */
	case FS_IOC32_GETFLAGS:
	case FS_IOC32_SETFLAGS:
		cmd = (cmd == FS_IOC32_GETFLAGS) ?
			FS_IOC_GETFLAGS : FS_IOC_SETFLAGS;
		fallthrough;
	/*
	 * everything else in do_vfs_ioctl() takes either a compatible
	 * pointer argument or no argument -- call it with a modified
	 * argument.
	 */
	default:
		error = do_vfs_ioctl(f.file, fd, cmd,
				     (unsigned long)compat_ptr(arg));
		if (error != -ENOIOCTLCMD)
			break;

		if (f.file->f_op->compat_ioctl)
			error = f.file->f_op->compat_ioctl(f.file, cmd, arg);
		if (error == -ENOIOCTLCMD)
			error = -ENOTTY;
		break;
	}

 out:
	fdput(f);

	return error;
}
#endif