summaryrefslogtreecommitdiffstats
path: root/fs/xfs/scrub/rmap.c
blob: c99d1714f283b08e100a9cf50b25ec192834d681 (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
// 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_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_trans.h"
#include "xfs_btree.h"
#include "xfs_rmap.h"
#include "xfs_refcount.h"
#include "xfs_ag.h"
#include "xfs_bit.h"
#include "xfs_alloc.h"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_refcount_btree.h"
#include "scrub/scrub.h"
#include "scrub/common.h"
#include "scrub/btree.h"
#include "scrub/bitmap.h"
#include "scrub/agb_bitmap.h"

/*
 * Set us up to scrub reverse mapping btrees.
 */
int
xchk_setup_ag_rmapbt(
	struct xfs_scrub	*sc)
{
	if (xchk_need_intent_drain(sc))
		xchk_fsgates_enable(sc, XCHK_FSGATES_DRAIN);

	return xchk_setup_ag_btree(sc, false);
}

/* Reverse-mapping scrubber. */

struct xchk_rmap {
	/*
	 * The furthest-reaching of the rmapbt records that we've already
	 * processed.  This enables us to detect overlapping records for space
	 * allocations that cannot be shared.
	 */
	struct xfs_rmap_irec	overlap_rec;

	/*
	 * The previous rmapbt record, so that we can check for two records
	 * that could be one.
	 */
	struct xfs_rmap_irec	prev_rec;

	/* Bitmaps containing all blocks for each type of AG metadata. */
	struct xagb_bitmap	fs_owned;
	struct xagb_bitmap	log_owned;
	struct xagb_bitmap	ag_owned;
	struct xagb_bitmap	inobt_owned;
	struct xagb_bitmap	refcbt_owned;

	/* Did we complete the AG space metadata bitmaps? */
	bool			bitmaps_complete;
};

/* Cross-reference a rmap against the refcount btree. */
STATIC void
xchk_rmapbt_xref_refc(
	struct xfs_scrub	*sc,
	struct xfs_rmap_irec	*irec)
{
	xfs_agblock_t		fbno;
	xfs_extlen_t		flen;
	bool			non_inode;
	bool			is_bmbt;
	bool			is_attr;
	bool			is_unwritten;
	int			error;

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

	non_inode = XFS_RMAP_NON_INODE_OWNER(irec->rm_owner);
	is_bmbt = irec->rm_flags & XFS_RMAP_BMBT_BLOCK;
	is_attr = irec->rm_flags & XFS_RMAP_ATTR_FORK;
	is_unwritten = irec->rm_flags & XFS_RMAP_UNWRITTEN;

	/* If this is shared, must be a data fork extent. */
	error = xfs_refcount_find_shared(sc->sa.refc_cur, irec->rm_startblock,
			irec->rm_blockcount, &fbno, &flen, false);
	if (!xchk_should_check_xref(sc, &error, &sc->sa.refc_cur))
		return;
	if (flen != 0 && (non_inode || is_attr || is_bmbt || is_unwritten))
		xchk_btree_xref_set_corrupt(sc, sc->sa.refc_cur, 0);
}

/* Cross-reference with the other btrees. */
STATIC void
xchk_rmapbt_xref(
	struct xfs_scrub	*sc,
	struct xfs_rmap_irec	*irec)
{
	xfs_agblock_t		agbno = irec->rm_startblock;
	xfs_extlen_t		len = irec->rm_blockcount;

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

	xchk_xref_is_used_space(sc, agbno, len);
	if (irec->rm_owner == XFS_RMAP_OWN_INODES)
		xchk_xref_is_inode_chunk(sc, agbno, len);
	else
		xchk_xref_is_not_inode_chunk(sc, agbno, len);
	if (irec->rm_owner == XFS_RMAP_OWN_COW)
		xchk_xref_is_cow_staging(sc, irec->rm_startblock,
				irec->rm_blockcount);
	else
		xchk_rmapbt_xref_refc(sc, irec);
}

/*
 * Check for bogus UNWRITTEN flags in the rmapbt node block keys.
 *
 * In reverse mapping records, the file mapping extent state
 * (XFS_RMAP_OFF_UNWRITTEN) is a record attribute, not a key field.  It is not
 * involved in lookups in any way.  In older kernels, the functions that
 * convert rmapbt records to keys forgot to filter out the extent state bit,
 * even though the key comparison functions have filtered the flag correctly.
 * If we spot an rmap key with the unwritten bit set in rm_offset, we should
 * mark the btree as needing optimization to rebuild the btree without those
 * flags.
 */
STATIC void
xchk_rmapbt_check_unwritten_in_keyflags(
	struct xchk_btree	*bs)
{
	struct xfs_scrub	*sc = bs->sc;
	struct xfs_btree_cur	*cur = bs->cur;
	struct xfs_btree_block	*keyblock;
	union xfs_btree_key	*lkey, *hkey;
	__be64			badflag = cpu_to_be64(XFS_RMAP_OFF_UNWRITTEN);
	unsigned int		level;

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

	for (level = 1; level < cur->bc_nlevels; level++) {
		struct xfs_buf	*bp;
		unsigned int	ptr;

		/* Only check the first time we've seen this node block. */
		if (cur->bc_levels[level].ptr > 1)
			continue;

		keyblock = xfs_btree_get_block(cur, level, &bp);
		for (ptr = 1; ptr <= be16_to_cpu(keyblock->bb_numrecs); ptr++) {
			lkey = xfs_btree_key_addr(cur, ptr, keyblock);

			if (lkey->rmap.rm_offset & badflag) {
				xchk_btree_set_preen(sc, cur, level);
				break;
			}

			hkey = xfs_btree_high_key_addr(cur, ptr, keyblock);
			if (hkey->rmap.rm_offset & badflag) {
				xchk_btree_set_preen(sc, cur, level);
				break;
			}
		}
	}
}

static inline bool
xchk_rmapbt_is_shareable(
	struct xfs_scrub		*sc,
	const struct xfs_rmap_irec	*irec)
{
	if (!xfs_has_reflink(sc->mp))
		return false;
	if (XFS_RMAP_NON_INODE_OWNER(irec->rm_owner))
		return false;
	if (irec->rm_flags & (XFS_RMAP_BMBT_BLOCK | XFS_RMAP_ATTR_FORK |
			      XFS_RMAP_UNWRITTEN))
		return false;
	return true;
}

/* Flag failures for records that overlap but cannot. */
STATIC void
xchk_rmapbt_check_overlapping(
	struct xchk_btree		*bs,
	struct xchk_rmap		*cr,
	const struct xfs_rmap_irec	*irec)
{
	xfs_agblock_t			pnext, inext;

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

	/* No previous record? */
	if (cr->overlap_rec.rm_blockcount == 0)
		goto set_prev;

	/* Do overlap_rec and irec overlap? */
	pnext = cr->overlap_rec.rm_startblock + cr->overlap_rec.rm_blockcount;
	if (pnext <= irec->rm_startblock)
		goto set_prev;

	/* Overlap is only allowed if both records are data fork mappings. */
	if (!xchk_rmapbt_is_shareable(bs->sc, &cr->overlap_rec) ||
	    !xchk_rmapbt_is_shareable(bs->sc, irec))
		xchk_btree_set_corrupt(bs->sc, bs->cur, 0);

	/* Save whichever rmap record extends furthest. */
	inext = irec->rm_startblock + irec->rm_blockcount;
	if (pnext > inext)
		return;

set_prev:
	memcpy(&cr->overlap_rec, irec, sizeof(struct xfs_rmap_irec));
}

/* Decide if two reverse-mapping records can be merged. */
static inline bool
xchk_rmap_mergeable(
	struct xchk_rmap		*cr,
	const struct xfs_rmap_irec	*r2)
{
	const struct xfs_rmap_irec	*r1 = &cr->prev_rec;

	/* Ignore if prev_rec is not yet initialized. */
	if (cr->prev_rec.rm_blockcount == 0)
		return false;

	if (r1->rm_owner != r2->rm_owner)
		return false;
	if (r1->rm_startblock + r1->rm_blockcount != r2->rm_startblock)
		return false;
	if ((unsigned long long)r1->rm_blockcount + r2->rm_blockcount >
	    XFS_RMAP_LEN_MAX)
		return false;
	if (XFS_RMAP_NON_INODE_OWNER(r2->rm_owner))
		return true;
	/* must be an inode owner below here */
	if (r1->rm_flags != r2->rm_flags)
		return false;
	if (r1->rm_flags & XFS_RMAP_BMBT_BLOCK)
		return true;
	return r1->rm_offset + r1->rm_blockcount == r2->rm_offset;
}

/* Flag failures for records that could be merged. */
STATIC void
xchk_rmapbt_check_mergeable(
	struct xchk_btree		*bs,
	struct xchk_rmap		*cr,
	const struct xfs_rmap_irec	*irec)
{
	if (bs->sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
		return;

	if (xchk_rmap_mergeable(cr, irec))
		xchk_btree_set_corrupt(bs->sc, bs->cur, 0);

	memcpy(&cr->prev_rec, irec, sizeof(struct xfs_rmap_irec));
}

/* Compare an rmap for AG metadata against the metadata walk. */
STATIC int
xchk_rmapbt_mark_bitmap(
	struct xchk_btree		*bs,
	struct xchk_rmap		*cr,
	const struct xfs_rmap_irec	*irec)
{
	struct xfs_scrub		*sc = bs->sc;
	struct xagb_bitmap		*bmp = NULL;
	xfs_extlen_t			fsbcount = irec->rm_blockcount;

	/*
	 * Skip corrupt records.  It is essential that we detect records in the
	 * btree that cannot overlap but do, flag those as CORRUPT, and skip
	 * the bitmap comparison to avoid generating false XCORRUPT reports.
	 */
	if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
		return 0;

	/*
	 * If the AG metadata walk didn't complete, there's no point in
	 * comparing against partial results.
	 */
	if (!cr->bitmaps_complete)
		return 0;

	switch (irec->rm_owner) {
	case XFS_RMAP_OWN_FS:
		bmp = &cr->fs_owned;
		break;
	case XFS_RMAP_OWN_LOG:
		bmp = &cr->log_owned;
		break;
	case XFS_RMAP_OWN_AG:
		bmp = &cr->ag_owned;
		break;
	case XFS_RMAP_OWN_INOBT:
		bmp = &cr->inobt_owned;
		break;
	case XFS_RMAP_OWN_REFC:
		bmp = &cr->refcbt_owned;
		break;
	}

	if (!bmp)
		return 0;

	if (xagb_bitmap_test(bmp, irec->rm_startblock, &fsbcount)) {
		/*
		 * The start of this reverse mapping corresponds to a set
		 * region in the bitmap.  If the mapping covers more area than
		 * the set region, then it covers space that wasn't found by
		 * the AG metadata walk.
		 */
		if (fsbcount < irec->rm_blockcount)
			xchk_btree_xref_set_corrupt(bs->sc,
					bs->sc->sa.rmap_cur, 0);
	} else {
		/*
		 * The start of this reverse mapping does not correspond to a
		 * completely set region in the bitmap.  The region wasn't
		 * fully set by walking the AG metadata, so this is a
		 * cross-referencing corruption.
		 */
		xchk_btree_xref_set_corrupt(bs->sc, bs->sc->sa.rmap_cur, 0);
	}

	/* Unset the region so that we can detect missing rmap records. */
	return xagb_bitmap_clear(bmp, irec->rm_startblock, irec->rm_blockcount);
}

/* Scrub an rmapbt record. */
STATIC int
xchk_rmapbt_rec(
	struct xchk_btree	*bs,
	const union xfs_btree_rec *rec)
{
	struct xchk_rmap	*cr = bs->private;
	struct xfs_rmap_irec	irec;

	if (xfs_rmap_btrec_to_irec(rec, &irec) != NULL ||
	    xfs_rmap_check_irec(bs->cur, &irec) != NULL) {
		xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
		return 0;
	}

	xchk_rmapbt_check_unwritten_in_keyflags(bs);
	xchk_rmapbt_check_mergeable(bs, cr, &irec);
	xchk_rmapbt_check_overlapping(bs, cr, &irec);
	xchk_rmapbt_xref(bs->sc, &irec);

	return xchk_rmapbt_mark_bitmap(bs, cr, &irec);
}

/* Add an AGFL block to the rmap list. */
STATIC int
xchk_rmapbt_walk_agfl(
	struct xfs_mount	*mp,
	xfs_agblock_t		agbno,
	void			*priv)
{
	struct xagb_bitmap	*bitmap = priv;

	return xagb_bitmap_set(bitmap, agbno, 1);
}

/*
 * Set up bitmaps mapping all the AG metadata to compare with the rmapbt
 * records.
 *
 * Grab our own btree cursors here if the scrub setup function didn't give us a
 * btree cursor due to reports of poor health.  We need to find out if the
 * rmapbt disagrees with primary metadata btrees to tag the rmapbt as being
 * XCORRUPT.
 */
STATIC int
xchk_rmapbt_walk_ag_metadata(
	struct xfs_scrub	*sc,
	struct xchk_rmap	*cr)
{
	struct xfs_mount	*mp = sc->mp;
	struct xfs_buf		*agfl_bp;
	struct xfs_agf		*agf = sc->sa.agf_bp->b_addr;
	struct xfs_btree_cur	*cur;
	int			error;

	/* OWN_FS: AG headers */
	error = xagb_bitmap_set(&cr->fs_owned, XFS_SB_BLOCK(mp),
			XFS_AGFL_BLOCK(mp) - XFS_SB_BLOCK(mp) + 1);
	if (error)
		goto out;

	/* OWN_LOG: Internal log */
	if (xfs_ag_contains_log(mp, sc->sa.pag->pag_agno)) {
		error = xagb_bitmap_set(&cr->log_owned,
				XFS_FSB_TO_AGBNO(mp, mp->m_sb.sb_logstart),
				mp->m_sb.sb_logblocks);
		if (error)
			goto out;
	}

	/* OWN_AG: bnobt, cntbt, rmapbt, and AGFL */
	cur = sc->sa.bno_cur;
	if (!cur)
		cur = xfs_allocbt_init_cursor(sc->mp, sc->tp, sc->sa.agf_bp,
				sc->sa.pag, XFS_BTNUM_BNO);
	error = xagb_bitmap_set_btblocks(&cr->ag_owned, cur);
	if (cur != sc->sa.bno_cur)
		xfs_btree_del_cursor(cur, error);
	if (error)
		goto out;

	cur = sc->sa.cnt_cur;
	if (!cur)
		cur = xfs_allocbt_init_cursor(sc->mp, sc->tp, sc->sa.agf_bp,
				sc->sa.pag, XFS_BTNUM_CNT);
	error = xagb_bitmap_set_btblocks(&cr->ag_owned, cur);
	if (cur != sc->sa.cnt_cur)
		xfs_btree_del_cursor(cur, error);
	if (error)
		goto out;

	error = xagb_bitmap_set_btblocks(&cr->ag_owned, sc->sa.rmap_cur);
	if (error)
		goto out;

	error = xfs_alloc_read_agfl(sc->sa.pag, sc->tp, &agfl_bp);
	if (error)
		goto out;

	error = xfs_agfl_walk(sc->mp, agf, agfl_bp, xchk_rmapbt_walk_agfl,
			&cr->ag_owned);
	xfs_trans_brelse(sc->tp, agfl_bp);
	if (error)
		goto out;

	/* OWN_INOBT: inobt, finobt */
	cur = sc->sa.ino_cur;
	if (!cur)
		cur = xfs_inobt_init_cursor(sc->sa.pag, sc->tp, sc->sa.agi_bp,
				XFS_BTNUM_INO);
	error = xagb_bitmap_set_btblocks(&cr->inobt_owned, cur);
	if (cur != sc->sa.ino_cur)
		xfs_btree_del_cursor(cur, error);
	if (error)
		goto out;

	if (xfs_has_finobt(sc->mp)) {
		cur = sc->sa.fino_cur;
		if (!cur)
			cur = xfs_inobt_init_cursor(sc->sa.pag, sc->tp,
					sc->sa.agi_bp, XFS_BTNUM_FINO);
		error = xagb_bitmap_set_btblocks(&cr->inobt_owned, cur);
		if (cur != sc->sa.fino_cur)
			xfs_btree_del_cursor(cur, error);
		if (error)
			goto out;
	}

	/* OWN_REFC: refcountbt */
	if (xfs_has_reflink(sc->mp)) {
		cur = sc->sa.refc_cur;
		if (!cur)
			cur = xfs_refcountbt_init_cursor(sc->mp, sc->tp,
					sc->sa.agf_bp, sc->sa.pag);
		error = xagb_bitmap_set_btblocks(&cr->refcbt_owned, cur);
		if (cur != sc->sa.refc_cur)
			xfs_btree_del_cursor(cur, error);
		if (error)
			goto out;
	}

out:
	/*
	 * If there's an error, set XFAIL and disable the bitmap
	 * cross-referencing checks, but proceed with the scrub anyway.
	 */
	if (error)
		xchk_btree_xref_process_error(sc, sc->sa.rmap_cur,
				sc->sa.rmap_cur->bc_nlevels - 1, &error);
	else
		cr->bitmaps_complete = true;
	return 0;
}

/*
 * Check for set regions in the bitmaps; if there are any, the rmap records do
 * not describe all the AG metadata.
 */
STATIC void
xchk_rmapbt_check_bitmaps(
	struct xfs_scrub	*sc,
	struct xchk_rmap	*cr)
{
	struct xfs_btree_cur	*cur = sc->sa.rmap_cur;
	unsigned int		level;

	if (sc->sm->sm_flags & (XFS_SCRUB_OFLAG_CORRUPT |
				XFS_SCRUB_OFLAG_XFAIL))
		return;
	if (!cur)
		return;
	level = cur->bc_nlevels - 1;

	/*
	 * Any bitmap with bits still set indicates that the reverse mapping
	 * doesn't cover the entire primary structure.
	 */
	if (xagb_bitmap_hweight(&cr->fs_owned) != 0)
		xchk_btree_xref_set_corrupt(sc, cur, level);

	if (xagb_bitmap_hweight(&cr->log_owned) != 0)
		xchk_btree_xref_set_corrupt(sc, cur, level);

	if (xagb_bitmap_hweight(&cr->ag_owned) != 0)
		xchk_btree_xref_set_corrupt(sc, cur, level);

	if (xagb_bitmap_hweight(&cr->inobt_owned) != 0)
		xchk_btree_xref_set_corrupt(sc, cur, level);

	if (xagb_bitmap_hweight(&cr->refcbt_owned) != 0)
		xchk_btree_xref_set_corrupt(sc, cur, level);
}

/* Scrub the rmap btree for some AG. */
int
xchk_rmapbt(
	struct xfs_scrub	*sc)
{
	struct xchk_rmap	*cr;
	int			error;

	cr = kzalloc(sizeof(struct xchk_rmap), XCHK_GFP_FLAGS);
	if (!cr)
		return -ENOMEM;

	xagb_bitmap_init(&cr->fs_owned);
	xagb_bitmap_init(&cr->log_owned);
	xagb_bitmap_init(&cr->ag_owned);
	xagb_bitmap_init(&cr->inobt_owned);
	xagb_bitmap_init(&cr->refcbt_owned);

	error = xchk_rmapbt_walk_ag_metadata(sc, cr);
	if (error)
		goto out;

	error = xchk_btree(sc, sc->sa.rmap_cur, xchk_rmapbt_rec,
			&XFS_RMAP_OINFO_AG, cr);
	if (error)
		goto out;

	xchk_rmapbt_check_bitmaps(sc, cr);

out:
	xagb_bitmap_destroy(&cr->refcbt_owned);
	xagb_bitmap_destroy(&cr->inobt_owned);
	xagb_bitmap_destroy(&cr->ag_owned);
	xagb_bitmap_destroy(&cr->log_owned);
	xagb_bitmap_destroy(&cr->fs_owned);
	kfree(cr);
	return error;
}

/* xref check that the extent is owned only by a given owner */
void
xchk_xref_is_only_owned_by(
	struct xfs_scrub		*sc,
	xfs_agblock_t			bno,
	xfs_extlen_t			len,
	const struct xfs_owner_info	*oinfo)
{
	struct xfs_rmap_matches		res;
	int				error;

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

	error = xfs_rmap_count_owners(sc->sa.rmap_cur, bno, len, oinfo, &res);
	if (!xchk_should_check_xref(sc, &error, &sc->sa.rmap_cur))
		return;
	if (res.matches != 1)
		xchk_btree_xref_set_corrupt(sc, sc->sa.rmap_cur, 0);
	if (res.bad_non_owner_matches)
		xchk_btree_xref_set_corrupt(sc, sc->sa.rmap_cur, 0);
	if (res.non_owner_matches)
		xchk_btree_xref_set_corrupt(sc, sc->sa.rmap_cur, 0);
}

/* xref check that the extent is not owned by a given owner */
void
xchk_xref_is_not_owned_by(
	struct xfs_scrub		*sc,
	xfs_agblock_t			bno,
	xfs_extlen_t			len,
	const struct xfs_owner_info	*oinfo)
{
	struct xfs_rmap_matches		res;
	int				error;

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

	error = xfs_rmap_count_owners(sc->sa.rmap_cur, bno, len, oinfo, &res);
	if (!xchk_should_check_xref(sc, &error, &sc->sa.rmap_cur))
		return;
	if (res.matches != 0)
		xchk_btree_xref_set_corrupt(sc, sc->sa.rmap_cur, 0);
	if (res.bad_non_owner_matches)
		xchk_btree_xref_set_corrupt(sc, sc->sa.rmap_cur, 0);
}

/* xref check that the extent has no reverse mapping at all */
void
xchk_xref_has_no_owner(
	struct xfs_scrub	*sc,
	xfs_agblock_t		bno,
	xfs_extlen_t		len)
{
	enum xbtree_recpacking	outcome;
	int			error;

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

	error = xfs_rmap_has_records(sc->sa.rmap_cur, bno, len, &outcome);
	if (!xchk_should_check_xref(sc, &error, &sc->sa.rmap_cur))
		return;
	if (outcome != XBTREE_RECPACKING_EMPTY)
		xchk_btree_xref_set_corrupt(sc, sc->sa.rmap_cur, 0);
}