summaryrefslogtreecommitdiffstats
path: root/fs/xfs/scrub/inode.c
blob: 6e2fe2d6250b3a8c92adb5f47e81921e862e2f47 (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2017-2023 Oracle.  All Rights Reserved.
 * Author: Darrick J. Wong <djwong@kernel.org>
 */
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_btree.h"
#include "xfs_log_format.h"
#include "xfs_trans.h"
#include "xfs_ag.h"
#include "xfs_inode.h"
#include "xfs_ialloc.h"
#include "xfs_icache.h"
#include "xfs_da_format.h"
#include "xfs_reflink.h"
#include "xfs_rmap.h"
#include "xfs_bmap_util.h"
#include "xfs_rtbitmap.h"
#include "scrub/scrub.h"
#include "scrub/common.h"
#include "scrub/btree.h"
#include "scrub/trace.h"
#include "scrub/repair.h"

/* Prepare the attached inode for scrubbing. */
static inline int
xchk_prepare_iscrub(
	struct xfs_scrub	*sc)
{
	int			error;

	xchk_ilock(sc, XFS_IOLOCK_EXCL);

	error = xchk_trans_alloc(sc, 0);
	if (error)
		return error;

	error = xchk_ino_dqattach(sc);
	if (error)
		return error;

	xchk_ilock(sc, XFS_ILOCK_EXCL);
	return 0;
}

/* Install this scrub-by-handle inode and prepare it for scrubbing. */
static inline int
xchk_install_handle_iscrub(
	struct xfs_scrub	*sc,
	struct xfs_inode	*ip)
{
	int			error;

	error = xchk_install_handle_inode(sc, ip);
	if (error)
		return error;

	return xchk_prepare_iscrub(sc);
}

/*
 * Grab total control of the inode metadata.  In the best case, we grab the
 * incore inode and take all locks on it.  If the incore inode cannot be
 * constructed due to corruption problems, lock the AGI so that we can single
 * step the loading process to fix everything that can go wrong.
 */
int
xchk_setup_inode(
	struct xfs_scrub	*sc)
{
	struct xfs_imap		imap;
	struct xfs_inode	*ip;
	struct xfs_mount	*mp = sc->mp;
	struct xfs_inode	*ip_in = XFS_I(file_inode(sc->file));
	struct xfs_buf		*agi_bp;
	struct xfs_perag	*pag;
	xfs_agnumber_t		agno = XFS_INO_TO_AGNO(mp, sc->sm->sm_ino);
	int			error;

	if (xchk_need_intent_drain(sc))
		xchk_fsgates_enable(sc, XCHK_FSGATES_DRAIN);

	/* We want to scan the opened inode, so lock it and exit. */
	if (sc->sm->sm_ino == 0 || sc->sm->sm_ino == ip_in->i_ino) {
		error = xchk_install_live_inode(sc, ip_in);
		if (error)
			return error;

		return xchk_prepare_iscrub(sc);
	}

	/* Reject internal metadata files and obviously bad inode numbers. */
	if (xfs_internal_inum(mp, sc->sm->sm_ino))
		return -ENOENT;
	if (!xfs_verify_ino(sc->mp, sc->sm->sm_ino))
		return -ENOENT;

	/* Try a safe untrusted iget. */
	error = xchk_iget_safe(sc, sc->sm->sm_ino, &ip);
	if (!error)
		return xchk_install_handle_iscrub(sc, ip);
	if (error == -ENOENT)
		return error;
	if (error != -EFSCORRUPTED && error != -EFSBADCRC && error != -EINVAL)
		goto out_error;

	/*
	 * EINVAL with IGET_UNTRUSTED probably means one of several things:
	 * userspace gave us an inode number that doesn't correspond to fs
	 * space; the inode btree lacks a record for this inode; or there is
	 * a record, and it says this inode is free.
	 *
	 * EFSCORRUPTED/EFSBADCRC could mean that the inode was mappable, but
	 * some other metadata corruption (e.g. inode forks) prevented
	 * instantiation of the incore inode.  Or it could mean the inobt is
	 * corrupt.
	 *
	 * We want to look up this inode in the inobt directly to distinguish
	 * three different scenarios: (1) the inobt says the inode is free,
	 * in which case there's nothing to do; (2) the inobt is corrupt so we
	 * should flag the corruption and exit to userspace to let it fix the
	 * inobt; and (3) the inobt says the inode is allocated, but loading it
	 * failed due to corruption.
	 *
	 * Allocate a transaction and grab the AGI to prevent inobt activity in
	 * this AG.  Retry the iget in case someone allocated a new inode after
	 * the first iget failed.
	 */
	error = xchk_trans_alloc(sc, 0);
	if (error)
		goto out_error;

	error = xchk_iget_agi(sc, sc->sm->sm_ino, &agi_bp, &ip);
	if (error == 0) {
		/* Actually got the incore inode, so install it and proceed. */
		xchk_trans_cancel(sc);
		return xchk_install_handle_iscrub(sc, ip);
	}
	if (error == -ENOENT)
		goto out_gone;
	if (error != -EFSCORRUPTED && error != -EFSBADCRC && error != -EINVAL)
		goto out_cancel;

	/* Ensure that we have protected against inode allocation/freeing. */
	if (agi_bp == NULL) {
		ASSERT(agi_bp != NULL);
		error = -ECANCELED;
		goto out_cancel;
	}

	/*
	 * Untrusted iget failed a second time.  Let's try an inobt lookup.
	 * If the inobt doesn't think this is an allocated inode then we'll
	 * return ENOENT to signal that the check can be skipped.
	 *
	 * If the lookup signals corruption, we'll mark this inode corrupt and
	 * exit to userspace.  There's little chance of fixing anything until
	 * the inobt is straightened out, but there's nothing we can do here.
	 *
	 * If the lookup encounters a runtime error, exit to userspace.
	 */
	pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, sc->sm->sm_ino));
	if (!pag) {
		error = -EFSCORRUPTED;
		goto out_cancel;
	}

	error = xfs_imap(pag, sc->tp, sc->sm->sm_ino, &imap,
			XFS_IGET_UNTRUSTED);
	xfs_perag_put(pag);
	if (error == -EINVAL || error == -ENOENT)
		goto out_gone;
	if (error)
		goto out_cancel;

	/*
	 * The lookup succeeded.  Chances are the ondisk inode is corrupt and
	 * preventing iget from reading it.  Retain the scrub transaction and
	 * the AGI buffer to prevent anyone from allocating or freeing inodes.
	 * This ensures that we preserve the inconsistency between the inobt
	 * saying the inode is allocated and the icache being unable to load
	 * the inode until we can flag the corruption in xchk_inode.  The
	 * scrub function has to note the corruption, since we're not really
	 * supposed to do that from the setup function.  Save the mapping to
	 * make repairs to the ondisk inode buffer.
	 */
	if (xchk_could_repair(sc))
		xrep_setup_inode(sc, &imap);
	return 0;

out_cancel:
	xchk_trans_cancel(sc);
out_error:
	trace_xchk_op_error(sc, agno, XFS_INO_TO_AGBNO(mp, sc->sm->sm_ino),
			error, __return_address);
	return error;
out_gone:
	/* The file is gone, so there's nothing to check. */
	xchk_trans_cancel(sc);
	return -ENOENT;
}

/* Inode core */

/* Validate di_extsize hint. */
STATIC void
xchk_inode_extsize(
	struct xfs_scrub	*sc,
	struct xfs_dinode	*dip,
	xfs_ino_t		ino,
	uint16_t		mode,
	uint16_t		flags)
{
	xfs_failaddr_t		fa;
	uint32_t		value = be32_to_cpu(dip->di_extsize);

	fa = xfs_inode_validate_extsize(sc->mp, value, mode, flags);
	if (fa)
		xchk_ino_set_corrupt(sc, ino);

	/*
	 * XFS allows a sysadmin to change the rt extent size when adding a rt
	 * section to a filesystem after formatting.  If there are any
	 * directories with extszinherit and rtinherit set, the hint could
	 * become misaligned with the new rextsize.  The verifier doesn't check
	 * this, because we allow rtinherit directories even without an rt
	 * device.  Flag this as an administrative warning since we will clean
	 * this up eventually.
	 */
	if ((flags & XFS_DIFLAG_RTINHERIT) &&
	    (flags & XFS_DIFLAG_EXTSZINHERIT) &&
	    xfs_extlen_to_rtxmod(sc->mp, value) > 0)
		xchk_ino_set_warning(sc, ino);
}

/*
 * Validate di_cowextsize hint.
 *
 * The rules are documented at xfs_ioctl_setattr_check_cowextsize().
 * These functions must be kept in sync with each other.
 */
STATIC void
xchk_inode_cowextsize(
	struct xfs_scrub	*sc,
	struct xfs_dinode	*dip,
	xfs_ino_t		ino,
	uint16_t		mode,
	uint16_t		flags,
	uint64_t		flags2)
{
	xfs_failaddr_t		fa;

	fa = xfs_inode_validate_cowextsize(sc->mp,
			be32_to_cpu(dip->di_cowextsize), mode, flags,
			flags2);
	if (fa)
		xchk_ino_set_corrupt(sc, ino);
}

/* Make sure the di_flags make sense for the inode. */
STATIC void
xchk_inode_flags(
	struct xfs_scrub	*sc,
	struct xfs_dinode	*dip,
	xfs_ino_t		ino,
	uint16_t		mode,
	uint16_t		flags)
{
	struct xfs_mount	*mp = sc->mp;

	/* di_flags are all taken, last bit cannot be used */
	if (flags & ~XFS_DIFLAG_ANY)
		goto bad;

	/* rt flags require rt device */
	if ((flags & XFS_DIFLAG_REALTIME) && !mp->m_rtdev_targp)
		goto bad;

	/* new rt bitmap flag only valid for rbmino */
	if ((flags & XFS_DIFLAG_NEWRTBM) && ino != mp->m_sb.sb_rbmino)
		goto bad;

	/* directory-only flags */
	if ((flags & (XFS_DIFLAG_RTINHERIT |
		     XFS_DIFLAG_EXTSZINHERIT |
		     XFS_DIFLAG_PROJINHERIT |
		     XFS_DIFLAG_NOSYMLINKS)) &&
	    !S_ISDIR(mode))
		goto bad;

	/* file-only flags */
	if ((flags & (XFS_DIFLAG_REALTIME | FS_XFLAG_EXTSIZE)) &&
	    !S_ISREG(mode))
		goto bad;

	/* filestreams and rt make no sense */
	if ((flags & XFS_DIFLAG_FILESTREAM) && (flags & XFS_DIFLAG_REALTIME))
		goto bad;

	return;
bad:
	xchk_ino_set_corrupt(sc, ino);
}

/* Make sure the di_flags2 make sense for the inode. */
STATIC void
xchk_inode_flags2(
	struct xfs_scrub	*sc,
	struct xfs_dinode	*dip,
	xfs_ino_t		ino,
	uint16_t		mode,
	uint16_t		flags,
	uint64_t		flags2)
{
	struct xfs_mount	*mp = sc->mp;

	/* Unknown di_flags2 could be from a future kernel */
	if (flags2 & ~XFS_DIFLAG2_ANY)
		xchk_ino_set_warning(sc, ino);

	/* reflink flag requires reflink feature */
	if ((flags2 & XFS_DIFLAG2_REFLINK) &&
	    !xfs_has_reflink(mp))
		goto bad;

	/* cowextsize flag is checked w.r.t. mode separately */

	/* file/dir-only flags */
	if ((flags2 & XFS_DIFLAG2_DAX) && !(S_ISREG(mode) || S_ISDIR(mode)))
		goto bad;

	/* file-only flags */
	if ((flags2 & XFS_DIFLAG2_REFLINK) && !S_ISREG(mode))
		goto bad;

	/* realtime and reflink make no sense, currently */
	if ((flags & XFS_DIFLAG_REALTIME) && (flags2 & XFS_DIFLAG2_REFLINK))
		goto bad;

	/* no bigtime iflag without the bigtime feature */
	if (xfs_dinode_has_bigtime(dip) && !xfs_has_bigtime(mp))
		goto bad;

	/* no large extent counts without the filesystem feature */
	if ((flags2 & XFS_DIFLAG2_NREXT64) && !xfs_has_large_extent_counts(mp))
		goto bad;

	return;
bad:
	xchk_ino_set_corrupt(sc, ino);
}

static inline void
xchk_dinode_nsec(
	struct xfs_scrub	*sc,
	xfs_ino_t		ino,
	struct xfs_dinode	*dip,
	const xfs_timestamp_t	ts)
{
	struct timespec64	tv;

	tv = xfs_inode_from_disk_ts(dip, ts);
	if (tv.tv_nsec < 0 || tv.tv_nsec >= NSEC_PER_SEC)
		xchk_ino_set_corrupt(sc, ino);
}

/* Scrub all the ondisk inode fields. */
STATIC void
xchk_dinode(
	struct xfs_scrub	*sc,
	struct xfs_dinode	*dip,
	xfs_ino_t		ino)
{
	struct xfs_mount	*mp = sc->mp;
	size_t			fork_recs;
	unsigned long long	isize;
	uint64_t		flags2;
	xfs_extnum_t		nextents;
	xfs_extnum_t		naextents;
	prid_t			prid;
	uint16_t		flags;
	uint16_t		mode;

	flags = be16_to_cpu(dip->di_flags);
	if (dip->di_version >= 3)
		flags2 = be64_to_cpu(dip->di_flags2);
	else
		flags2 = 0;

	/* di_mode */
	mode = be16_to_cpu(dip->di_mode);
	switch (mode & S_IFMT) {
	case S_IFLNK:
	case S_IFREG:
	case S_IFDIR:
	case S_IFCHR:
	case S_IFBLK:
	case S_IFIFO:
	case S_IFSOCK:
		/* mode is recognized */
		break;
	default:
		xchk_ino_set_corrupt(sc, ino);
		break;
	}

	/* v1/v2 fields */
	switch (dip->di_version) {
	case 1:
		/*
		 * We autoconvert v1 inodes into v2 inodes on writeout,
		 * so just mark this inode for preening.
		 */
		xchk_ino_set_preen(sc, ino);
		prid = 0;
		break;
	case 2:
	case 3:
		if (dip->di_onlink != 0)
			xchk_ino_set_corrupt(sc, ino);

		if (dip->di_mode == 0 && sc->ip)
			xchk_ino_set_corrupt(sc, ino);

		if (dip->di_projid_hi != 0 &&
		    !xfs_has_projid32(mp))
			xchk_ino_set_corrupt(sc, ino);

		prid = be16_to_cpu(dip->di_projid_lo);
		break;
	default:
		xchk_ino_set_corrupt(sc, ino);
		return;
	}

	if (xfs_has_projid32(mp))
		prid |= (prid_t)be16_to_cpu(dip->di_projid_hi) << 16;

	/*
	 * di_uid/di_gid -- -1 isn't invalid, but there's no way that
	 * userspace could have created that.
	 */
	if (dip->di_uid == cpu_to_be32(-1U) ||
	    dip->di_gid == cpu_to_be32(-1U))
		xchk_ino_set_warning(sc, ino);

	/*
	 * project id of -1 isn't supposed to be valid, but the kernel didn't
	 * always validate that.
	 */
	if (prid == -1U)
		xchk_ino_set_warning(sc, ino);

	/* di_format */
	switch (dip->di_format) {
	case XFS_DINODE_FMT_DEV:
		if (!S_ISCHR(mode) && !S_ISBLK(mode) &&
		    !S_ISFIFO(mode) && !S_ISSOCK(mode))
			xchk_ino_set_corrupt(sc, ino);
		break;
	case XFS_DINODE_FMT_LOCAL:
		if (!S_ISDIR(mode) && !S_ISLNK(mode))
			xchk_ino_set_corrupt(sc, ino);
		break;
	case XFS_DINODE_FMT_EXTENTS:
		if (!S_ISREG(mode) && !S_ISDIR(mode) && !S_ISLNK(mode))
			xchk_ino_set_corrupt(sc, ino);
		break;
	case XFS_DINODE_FMT_BTREE:
		if (!S_ISREG(mode) && !S_ISDIR(mode))
			xchk_ino_set_corrupt(sc, ino);
		break;
	case XFS_DINODE_FMT_UUID:
	default:
		xchk_ino_set_corrupt(sc, ino);
		break;
	}

	/* di_[amc]time.nsec */
	xchk_dinode_nsec(sc, ino, dip, dip->di_atime);
	xchk_dinode_nsec(sc, ino, dip, dip->di_mtime);
	xchk_dinode_nsec(sc, ino, dip, dip->di_ctime);

	/*
	 * di_size.  xfs_dinode_verify checks for things that screw up
	 * the VFS such as the upper bit being set and zero-length
	 * symlinks/directories, but we can do more here.
	 */
	isize = be64_to_cpu(dip->di_size);
	if (isize & (1ULL << 63))
		xchk_ino_set_corrupt(sc, ino);

	/* Devices, fifos, and sockets must have zero size */
	if (!S_ISDIR(mode) && !S_ISREG(mode) && !S_ISLNK(mode) && isize != 0)
		xchk_ino_set_corrupt(sc, ino);

	/* Directories can't be larger than the data section size (32G) */
	if (S_ISDIR(mode) && (isize == 0 || isize >= XFS_DIR2_SPACE_SIZE))
		xchk_ino_set_corrupt(sc, ino);

	/* Symlinks can't be larger than SYMLINK_MAXLEN */
	if (S_ISLNK(mode) && (isize == 0 || isize >= XFS_SYMLINK_MAXLEN))
		xchk_ino_set_corrupt(sc, ino);

	/*
	 * Warn if the running kernel can't handle the kinds of offsets
	 * needed to deal with the file size.  In other words, if the
	 * pagecache can't cache all the blocks in this file due to
	 * overly large offsets, flag the inode for admin review.
	 */
	if (isize > mp->m_super->s_maxbytes)
		xchk_ino_set_warning(sc, ino);

	/* di_nblocks */
	if (flags2 & XFS_DIFLAG2_REFLINK) {
		; /* nblocks can exceed dblocks */
	} else if (flags & XFS_DIFLAG_REALTIME) {
		/*
		 * nblocks is the sum of data extents (in the rtdev),
		 * attr extents (in the datadev), and both forks' bmbt
		 * blocks (in the datadev).  This clumsy check is the
		 * best we can do without cross-referencing with the
		 * inode forks.
		 */
		if (be64_to_cpu(dip->di_nblocks) >=
		    mp->m_sb.sb_dblocks + mp->m_sb.sb_rblocks)
			xchk_ino_set_corrupt(sc, ino);
	} else {
		if (be64_to_cpu(dip->di_nblocks) >= mp->m_sb.sb_dblocks)
			xchk_ino_set_corrupt(sc, ino);
	}

	xchk_inode_flags(sc, dip, ino, mode, flags);

	xchk_inode_extsize(sc, dip, ino, mode, flags);

	nextents = xfs_dfork_data_extents(dip);
	naextents = xfs_dfork_attr_extents(dip);

	/* di_nextents */
	fork_recs =  XFS_DFORK_DSIZE(dip, mp) / sizeof(struct xfs_bmbt_rec);
	switch (dip->di_format) {
	case XFS_DINODE_FMT_EXTENTS:
		if (nextents > fork_recs)
			xchk_ino_set_corrupt(sc, ino);
		break;
	case XFS_DINODE_FMT_BTREE:
		if (nextents <= fork_recs)
			xchk_ino_set_corrupt(sc, ino);
		break;
	default:
		if (nextents != 0)
			xchk_ino_set_corrupt(sc, ino);
		break;
	}

	/* di_forkoff */
	if (XFS_DFORK_BOFF(dip) >= mp->m_sb.sb_inodesize)
		xchk_ino_set_corrupt(sc, ino);
	if (naextents != 0 && dip->di_forkoff == 0)
		xchk_ino_set_corrupt(sc, ino);
	if (dip->di_forkoff == 0 && dip->di_aformat != XFS_DINODE_FMT_EXTENTS)
		xchk_ino_set_corrupt(sc, ino);

	/* di_aformat */
	if (dip->di_aformat != XFS_DINODE_FMT_LOCAL &&
	    dip->di_aformat != XFS_DINODE_FMT_EXTENTS &&
	    dip->di_aformat != XFS_DINODE_FMT_BTREE)
		xchk_ino_set_corrupt(sc, ino);

	/* di_anextents */
	fork_recs =  XFS_DFORK_ASIZE(dip, mp) / sizeof(struct xfs_bmbt_rec);
	switch (dip->di_aformat) {
	case XFS_DINODE_FMT_EXTENTS:
		if (naextents > fork_recs)
			xchk_ino_set_corrupt(sc, ino);
		break;
	case XFS_DINODE_FMT_BTREE:
		if (naextents <= fork_recs)
			xchk_ino_set_corrupt(sc, ino);
		break;
	default:
		if (naextents != 0)
			xchk_ino_set_corrupt(sc, ino);
	}

	if (dip->di_version >= 3) {
		xchk_dinode_nsec(sc, ino, dip, dip->di_crtime);
		xchk_inode_flags2(sc, dip, ino, mode, flags, flags2);
		xchk_inode_cowextsize(sc, dip, ino, mode, flags,
				flags2);
	}
}

/*
 * Make sure the finobt doesn't think this inode is free.
 * We don't have to check the inobt ourselves because we got the inode via
 * IGET_UNTRUSTED, which checks the inobt for us.
 */
static void
xchk_inode_xref_finobt(
	struct xfs_scrub		*sc,
	xfs_ino_t			ino)
{
	struct xfs_inobt_rec_incore	rec;
	xfs_agino_t			agino;
	int				has_record;
	int				error;

	if (!sc->sa.fino_cur || xchk_skip_xref(sc->sm))
		return;

	agino = XFS_INO_TO_AGINO(sc->mp, ino);

	/*
	 * Try to get the finobt record.  If we can't get it, then we're
	 * in good shape.
	 */
	error = xfs_inobt_lookup(sc->sa.fino_cur, agino, XFS_LOOKUP_LE,
			&has_record);
	if (!xchk_should_check_xref(sc, &error, &sc->sa.fino_cur) ||
	    !has_record)
		return;

	error = xfs_inobt_get_rec(sc->sa.fino_cur, &rec, &has_record);
	if (!xchk_should_check_xref(sc, &error, &sc->sa.fino_cur) ||
	    !has_record)
		return;

	/*
	 * Otherwise, make sure this record either doesn't cover this inode,
	 * or that it does but it's marked present.
	 */
	if (rec.ir_startino > agino ||
	    rec.ir_startino + XFS_INODES_PER_CHUNK <= agino)
		return;

	if (rec.ir_free & XFS_INOBT_MASK(agino - rec.ir_startino))
		xchk_btree_xref_set_corrupt(sc, sc->sa.fino_cur, 0);
}

/* Cross reference the inode fields with the forks. */
STATIC void
xchk_inode_xref_bmap(
	struct xfs_scrub	*sc,
	struct xfs_dinode	*dip)
{
	xfs_extnum_t		nextents;
	xfs_filblks_t		count;
	xfs_filblks_t		acount;
	int			error;

	if (xchk_skip_xref(sc->sm))
		return;

	/* Walk all the extents to check nextents/naextents/nblocks. */
	error = xfs_bmap_count_blocks(sc->tp, sc->ip, XFS_DATA_FORK,
			&nextents, &count);
	if (!xchk_should_check_xref(sc, &error, NULL))
		return;
	if (nextents < xfs_dfork_data_extents(dip))
		xchk_ino_xref_set_corrupt(sc, sc->ip->i_ino);

	error = xfs_bmap_count_blocks(sc->tp, sc->ip, XFS_ATTR_FORK,
			&nextents, &acount);
	if (!xchk_should_check_xref(sc, &error, NULL))
		return;
	if (nextents != xfs_dfork_attr_extents(dip))
		xchk_ino_xref_set_corrupt(sc, sc->ip->i_ino);

	/* Check nblocks against the inode. */
	if (count + acount != be64_to_cpu(dip->di_nblocks))
		xchk_ino_xref_set_corrupt(sc, sc->ip->i_ino);
}

/* Cross-reference with the other btrees. */
STATIC void
xchk_inode_xref(
	struct xfs_scrub	*sc,
	xfs_ino_t		ino,
	struct xfs_dinode	*dip)
{
	xfs_agnumber_t		agno;
	xfs_agblock_t		agbno;
	int			error;

	if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
		return;

	agno = XFS_INO_TO_AGNO(sc->mp, ino);
	agbno = XFS_INO_TO_AGBNO(sc->mp, ino);

	error = xchk_ag_init_existing(sc, agno, &sc->sa);
	if (!xchk_xref_process_error(sc, agno, agbno, &error))
		goto out_free;

	xchk_xref_is_used_space(sc, agbno, 1);
	xchk_inode_xref_finobt(sc, ino);
	xchk_xref_is_only_owned_by(sc, agbno, 1, &XFS_RMAP_OINFO_INODES);
	xchk_xref_is_not_shared(sc, agbno, 1);
	xchk_xref_is_not_cow_staging(sc, agbno, 1);
	xchk_inode_xref_bmap(sc, dip);

out_free:
	xchk_ag_free(sc, &sc->sa);
}

/*
 * If the reflink iflag disagrees with a scan for shared data fork extents,
 * either flag an error (shared extents w/ no flag) or a preen (flag set w/o
 * any shared extents).  We already checked for reflink iflag set on a non
 * reflink filesystem.
 */
static void
xchk_inode_check_reflink_iflag(
	struct xfs_scrub	*sc,
	xfs_ino_t		ino)
{
	struct xfs_mount	*mp = sc->mp;
	bool			has_shared;
	int			error;

	if (!xfs_has_reflink(mp))
		return;

	error = xfs_reflink_inode_has_shared_extents(sc->tp, sc->ip,
			&has_shared);
	if (!xchk_xref_process_error(sc, XFS_INO_TO_AGNO(mp, ino),
			XFS_INO_TO_AGBNO(mp, ino), &error))
		return;
	if (xfs_is_reflink_inode(sc->ip) && !has_shared)
		xchk_ino_set_preen(sc, ino);
	else if (!xfs_is_reflink_inode(sc->ip) && has_shared)
		xchk_ino_set_corrupt(sc, ino);
}

/* Scrub an inode. */
int
xchk_inode(
	struct xfs_scrub	*sc)
{
	struct xfs_dinode	di;
	int			error = 0;

	/*
	 * If sc->ip is NULL, that means that the setup function called
	 * xfs_iget to look up the inode.  xfs_iget returned a EFSCORRUPTED
	 * and a NULL inode, so flag the corruption error and return.
	 */
	if (!sc->ip) {
		xchk_ino_set_corrupt(sc, sc->sm->sm_ino);
		return 0;
	}

	/* Scrub the inode core. */
	xfs_inode_to_disk(sc->ip, &di, 0);
	xchk_dinode(sc, &di, sc->ip->i_ino);
	if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
		goto out;

	/*
	 * Look for discrepancies between file's data blocks and the reflink
	 * iflag.  We already checked the iflag against the file mode when
	 * we scrubbed the dinode.
	 */
	if (S_ISREG(VFS_I(sc->ip)->i_mode))
		xchk_inode_check_reflink_iflag(sc, sc->ip->i_ino);

	xchk_inode_xref(sc, sc->ip->i_ino, &di);
out:
	return error;
}