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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) 2017 Oracle. All Rights Reserved.
4 * Author: Darrick J. Wong <darrick.wong@oracle.com>
5 */
6#include "xfs.h"
7#include "xfs_fs.h"
8#include "xfs_shared.h"
9#include "xfs_format.h"
10#include "xfs_trans_resv.h"
11#include "xfs_mount.h"
12#include "xfs_btree.h"
13#include "xfs_bit.h"
14#include "xfs_log_format.h"
15#include "xfs_trans.h"
16#include "xfs_inode.h"
17#include "xfs_alloc.h"
18#include "xfs_bmap.h"
19#include "xfs_bmap_btree.h"
20#include "xfs_rmap.h"
21#include "xfs_rmap_btree.h"
22#include "scrub/scrub.h"
23#include "scrub/common.h"
24#include "scrub/btree.h"
25#include "xfs_ag.h"
26
27/* Set us up with an inode's bmap. */
28int
29xchk_setup_inode_bmap(
30 struct xfs_scrub *sc)
31{
32 int error;
33
34 error = xchk_get_inode(sc);
35 if (error)
36 goto out;
37
38 sc->ilock_flags = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
39 xfs_ilock(sc->ip, sc->ilock_flags);
40
41 /*
42 * We don't want any ephemeral data fork updates sitting around
43 * while we inspect block mappings, so wait for directio to finish
44 * and flush dirty data if we have delalloc reservations.
45 */
46 if (S_ISREG(VFS_I(sc->ip)->i_mode) &&
47 sc->sm->sm_type == XFS_SCRUB_TYPE_BMBTD) {
48 struct address_space *mapping = VFS_I(sc->ip)->i_mapping;
49
50 inode_dio_wait(VFS_I(sc->ip));
51
52 /*
53 * Try to flush all incore state to disk before we examine the
54 * space mappings for the data fork. Leave accumulated errors
55 * in the mapping for the writer threads to consume.
56 *
57 * On ENOSPC or EIO writeback errors, we continue into the
58 * extent mapping checks because write failures do not
59 * necessarily imply anything about the correctness of the file
60 * metadata. The metadata and the file data could be on
61 * completely separate devices; a media failure might only
62 * affect a subset of the disk, etc. We can handle delalloc
63 * extents in the scrubber, so leaving them in memory is fine.
64 */
65 error = filemap_fdatawrite(mapping);
66 if (!error)
67 error = filemap_fdatawait_keep_errors(mapping);
68 if (error && (error != -ENOSPC && error != -EIO))
69 goto out;
70 }
71
72 /* Got the inode, lock it and we're ready to go. */
73 error = xchk_trans_alloc(sc, 0);
74 if (error)
75 goto out;
76 sc->ilock_flags |= XFS_ILOCK_EXCL;
77 xfs_ilock(sc->ip, XFS_ILOCK_EXCL);
78
79out:
80 /* scrub teardown will unlock and release the inode */
81 return error;
82}
83
84/*
85 * Inode fork block mapping (BMBT) scrubber.
86 * More complex than the others because we have to scrub
87 * all the extents regardless of whether or not the fork
88 * is in btree format.
89 */
90
91struct xchk_bmap_info {
92 struct xfs_scrub *sc;
93 xfs_fileoff_t lastoff;
94 bool is_rt;
95 bool is_shared;
96 bool was_loaded;
97 int whichfork;
98};
99
100/* Look for a corresponding rmap for this irec. */
101static inline bool
102xchk_bmap_get_rmap(
103 struct xchk_bmap_info *info,
104 struct xfs_bmbt_irec *irec,
105 xfs_agblock_t agbno,
106 uint64_t owner,
107 struct xfs_rmap_irec *rmap)
108{
109 xfs_fileoff_t offset;
110 unsigned int rflags = 0;
111 int has_rmap;
112 int error;
113
114 if (info->whichfork == XFS_ATTR_FORK)
115 rflags |= XFS_RMAP_ATTR_FORK;
116 if (irec->br_state == XFS_EXT_UNWRITTEN)
117 rflags |= XFS_RMAP_UNWRITTEN;
118
119 /*
120 * CoW staging extents are owned (on disk) by the refcountbt, so
121 * their rmaps do not have offsets.
122 */
123 if (info->whichfork == XFS_COW_FORK)
124 offset = 0;
125 else
126 offset = irec->br_startoff;
127
128 /*
129 * If the caller thinks this could be a shared bmbt extent (IOWs,
130 * any data fork extent of a reflink inode) then we have to use the
131 * range rmap lookup to make sure we get the correct owner/offset.
132 */
133 if (info->is_shared) {
134 error = xfs_rmap_lookup_le_range(info->sc->sa.rmap_cur, agbno,
135 owner, offset, rflags, rmap, &has_rmap);
136 if (!xchk_should_check_xref(info->sc, &error,
137 &info->sc->sa.rmap_cur))
138 return false;
139 goto out;
140 }
141
142 /*
143 * Otherwise, use the (faster) regular lookup.
144 */
145 error = xfs_rmap_lookup_le(info->sc->sa.rmap_cur, agbno, 0, owner,
146 offset, rflags, &has_rmap);
147 if (!xchk_should_check_xref(info->sc, &error,
148 &info->sc->sa.rmap_cur))
149 return false;
150 if (!has_rmap)
151 goto out;
152
153 error = xfs_rmap_get_rec(info->sc->sa.rmap_cur, rmap, &has_rmap);
154 if (!xchk_should_check_xref(info->sc, &error,
155 &info->sc->sa.rmap_cur))
156 return false;
157
158out:
159 if (!has_rmap)
160 xchk_fblock_xref_set_corrupt(info->sc, info->whichfork,
161 irec->br_startoff);
162 return has_rmap;
163}
164
165/* Make sure that we have rmapbt records for this extent. */
166STATIC void
167xchk_bmap_xref_rmap(
168 struct xchk_bmap_info *info,
169 struct xfs_bmbt_irec *irec,
170 xfs_agblock_t agbno)
171{
172 struct xfs_rmap_irec rmap;
173 unsigned long long rmap_end;
174 uint64_t owner;
175
176 if (!info->sc->sa.rmap_cur || xchk_skip_xref(info->sc->sm))
177 return;
178
179 if (info->whichfork == XFS_COW_FORK)
180 owner = XFS_RMAP_OWN_COW;
181 else
182 owner = info->sc->ip->i_ino;
183
184 /* Find the rmap record for this irec. */
185 if (!xchk_bmap_get_rmap(info, irec, agbno, owner, &rmap))
186 return;
187
188 /* Check the rmap. */
189 rmap_end = (unsigned long long)rmap.rm_startblock + rmap.rm_blockcount;
190 if (rmap.rm_startblock > agbno ||
191 agbno + irec->br_blockcount > rmap_end)
192 xchk_fblock_xref_set_corrupt(info->sc, info->whichfork,
193 irec->br_startoff);
194
195 /*
196 * Check the logical offsets if applicable. CoW staging extents
197 * don't track logical offsets since the mappings only exist in
198 * memory.
199 */
200 if (info->whichfork != XFS_COW_FORK) {
201 rmap_end = (unsigned long long)rmap.rm_offset +
202 rmap.rm_blockcount;
203 if (rmap.rm_offset > irec->br_startoff ||
204 irec->br_startoff + irec->br_blockcount > rmap_end)
205 xchk_fblock_xref_set_corrupt(info->sc,
206 info->whichfork, irec->br_startoff);
207 }
208
209 if (rmap.rm_owner != owner)
210 xchk_fblock_xref_set_corrupt(info->sc, info->whichfork,
211 irec->br_startoff);
212
213 /*
214 * Check for discrepancies between the unwritten flag in the irec and
215 * the rmap. Note that the (in-memory) CoW fork distinguishes between
216 * unwritten and written extents, but we don't track that in the rmap
217 * records because the blocks are owned (on-disk) by the refcountbt,
218 * which doesn't track unwritten state.
219 */
220 if (owner != XFS_RMAP_OWN_COW &&
221 !!(irec->br_state == XFS_EXT_UNWRITTEN) !=
222 !!(rmap.rm_flags & XFS_RMAP_UNWRITTEN))
223 xchk_fblock_xref_set_corrupt(info->sc, info->whichfork,
224 irec->br_startoff);
225
226 if (!!(info->whichfork == XFS_ATTR_FORK) !=
227 !!(rmap.rm_flags & XFS_RMAP_ATTR_FORK))
228 xchk_fblock_xref_set_corrupt(info->sc, info->whichfork,
229 irec->br_startoff);
230 if (rmap.rm_flags & XFS_RMAP_BMBT_BLOCK)
231 xchk_fblock_xref_set_corrupt(info->sc, info->whichfork,
232 irec->br_startoff);
233}
234
235/* Cross-reference a single rtdev extent record. */
236STATIC void
237xchk_bmap_rt_iextent_xref(
238 struct xfs_inode *ip,
239 struct xchk_bmap_info *info,
240 struct xfs_bmbt_irec *irec)
241{
242 xchk_xref_is_used_rt_space(info->sc, irec->br_startblock,
243 irec->br_blockcount);
244}
245
246/* Cross-reference a single datadev extent record. */
247STATIC void
248xchk_bmap_iextent_xref(
249 struct xfs_inode *ip,
250 struct xchk_bmap_info *info,
251 struct xfs_bmbt_irec *irec)
252{
253 struct xfs_mount *mp = info->sc->mp;
254 xfs_agnumber_t agno;
255 xfs_agblock_t agbno;
256 xfs_extlen_t len;
257 int error;
258
259 agno = XFS_FSB_TO_AGNO(mp, irec->br_startblock);
260 agbno = XFS_FSB_TO_AGBNO(mp, irec->br_startblock);
261 len = irec->br_blockcount;
262
263 error = xchk_ag_init(info->sc, agno, &info->sc->sa);
264 if (!xchk_fblock_process_error(info->sc, info->whichfork,
265 irec->br_startoff, &error))
266 return;
267
268 xchk_xref_is_used_space(info->sc, agbno, len);
269 xchk_xref_is_not_inode_chunk(info->sc, agbno, len);
270 xchk_bmap_xref_rmap(info, irec, agbno);
271 switch (info->whichfork) {
272 case XFS_DATA_FORK:
273 if (xfs_is_reflink_inode(info->sc->ip))
274 break;
275 fallthrough;
276 case XFS_ATTR_FORK:
277 xchk_xref_is_not_shared(info->sc, agbno,
278 irec->br_blockcount);
279 break;
280 case XFS_COW_FORK:
281 xchk_xref_is_cow_staging(info->sc, agbno,
282 irec->br_blockcount);
283 break;
284 }
285
286 xchk_ag_free(info->sc, &info->sc->sa);
287}
288
289/*
290 * Directories and attr forks should never have blocks that can't be addressed
291 * by a xfs_dablk_t.
292 */
293STATIC void
294xchk_bmap_dirattr_extent(
295 struct xfs_inode *ip,
296 struct xchk_bmap_info *info,
297 struct xfs_bmbt_irec *irec)
298{
299 struct xfs_mount *mp = ip->i_mount;
300 xfs_fileoff_t off;
301
302 if (!S_ISDIR(VFS_I(ip)->i_mode) && info->whichfork != XFS_ATTR_FORK)
303 return;
304
305 if (!xfs_verify_dablk(mp, irec->br_startoff))
306 xchk_fblock_set_corrupt(info->sc, info->whichfork,
307 irec->br_startoff);
308
309 off = irec->br_startoff + irec->br_blockcount - 1;
310 if (!xfs_verify_dablk(mp, off))
311 xchk_fblock_set_corrupt(info->sc, info->whichfork, off);
312}
313
314/* Scrub a single extent record. */
315STATIC int
316xchk_bmap_iextent(
317 struct xfs_inode *ip,
318 struct xchk_bmap_info *info,
319 struct xfs_bmbt_irec *irec)
320{
321 struct xfs_mount *mp = info->sc->mp;
322 int error = 0;
323
324 /*
325 * Check for out-of-order extents. This record could have come
326 * from the incore list, for which there is no ordering check.
327 */
328 if (irec->br_startoff < info->lastoff)
329 xchk_fblock_set_corrupt(info->sc, info->whichfork,
330 irec->br_startoff);
331
332 if (!xfs_verify_fileext(mp, irec->br_startoff, irec->br_blockcount))
333 xchk_fblock_set_corrupt(info->sc, info->whichfork,
334 irec->br_startoff);
335
336 xchk_bmap_dirattr_extent(ip, info, irec);
337
338 /* There should never be a "hole" extent in either extent list. */
339 if (irec->br_startblock == HOLESTARTBLOCK)
340 xchk_fblock_set_corrupt(info->sc, info->whichfork,
341 irec->br_startoff);
342
343 /*
344 * Check for delalloc extents. We never iterate the ones in the
345 * in-core extent scan, and we should never see these in the bmbt.
346 */
347 if (isnullstartblock(irec->br_startblock))
348 xchk_fblock_set_corrupt(info->sc, info->whichfork,
349 irec->br_startoff);
350
351 /* Make sure the extent points to a valid place. */
352 if (irec->br_blockcount > MAXEXTLEN)
353 xchk_fblock_set_corrupt(info->sc, info->whichfork,
354 irec->br_startoff);
355 if (info->is_rt &&
356 !xfs_verify_rtext(mp, irec->br_startblock, irec->br_blockcount))
357 xchk_fblock_set_corrupt(info->sc, info->whichfork,
358 irec->br_startoff);
359 if (!info->is_rt &&
360 !xfs_verify_fsbext(mp, irec->br_startblock, irec->br_blockcount))
361 xchk_fblock_set_corrupt(info->sc, info->whichfork,
362 irec->br_startoff);
363
364 /* We don't allow unwritten extents on attr forks. */
365 if (irec->br_state == XFS_EXT_UNWRITTEN &&
366 info->whichfork == XFS_ATTR_FORK)
367 xchk_fblock_set_corrupt(info->sc, info->whichfork,
368 irec->br_startoff);
369
370 if (info->sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
371 return 0;
372
373 if (info->is_rt)
374 xchk_bmap_rt_iextent_xref(ip, info, irec);
375 else
376 xchk_bmap_iextent_xref(ip, info, irec);
377
378 info->lastoff = irec->br_startoff + irec->br_blockcount;
379 return error;
380}
381
382/* Scrub a bmbt record. */
383STATIC int
384xchk_bmapbt_rec(
385 struct xchk_btree *bs,
386 union xfs_btree_rec *rec)
387{
388 struct xfs_bmbt_irec irec;
389 struct xfs_bmbt_irec iext_irec;
390 struct xfs_iext_cursor icur;
391 struct xchk_bmap_info *info = bs->private;
392 struct xfs_inode *ip = bs->cur->bc_ino.ip;
393 struct xfs_buf *bp = NULL;
394 struct xfs_btree_block *block;
395 struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, info->whichfork);
396 uint64_t owner;
397 int i;
398
399 /*
400 * Check the owners of the btree blocks up to the level below
401 * the root since the verifiers don't do that.
402 */
403 if (xfs_sb_version_hascrc(&bs->cur->bc_mp->m_sb) &&
404 bs->cur->bc_ptrs[0] == 1) {
405 for (i = 0; i < bs->cur->bc_nlevels - 1; i++) {
406 block = xfs_btree_get_block(bs->cur, i, &bp);
407 owner = be64_to_cpu(block->bb_u.l.bb_owner);
408 if (owner != ip->i_ino)
409 xchk_fblock_set_corrupt(bs->sc,
410 info->whichfork, 0);
411 }
412 }
413
414 /*
415 * Check that the incore extent tree contains an extent that matches
416 * this one exactly. We validate those cached bmaps later, so we don't
417 * need to check them here. If the incore extent tree was just loaded
418 * from disk by the scrubber, we assume that its contents match what's
419 * on disk (we still hold the ILOCK) and skip the equivalence check.
420 */
421 if (!info->was_loaded)
422 return 0;
423
424 xfs_bmbt_disk_get_all(&rec->bmbt, &irec);
425 if (!xfs_iext_lookup_extent(ip, ifp, irec.br_startoff, &icur,
426 &iext_irec) ||
427 irec.br_startoff != iext_irec.br_startoff ||
428 irec.br_startblock != iext_irec.br_startblock ||
429 irec.br_blockcount != iext_irec.br_blockcount ||
430 irec.br_state != iext_irec.br_state)
431 xchk_fblock_set_corrupt(bs->sc, info->whichfork,
432 irec.br_startoff);
433 return 0;
434}
435
436/* Scan the btree records. */
437STATIC int
438xchk_bmap_btree(
439 struct xfs_scrub *sc,
440 int whichfork,
441 struct xchk_bmap_info *info)
442{
443 struct xfs_owner_info oinfo;
444 struct xfs_ifork *ifp = XFS_IFORK_PTR(sc->ip, whichfork);
445 struct xfs_mount *mp = sc->mp;
446 struct xfs_inode *ip = sc->ip;
447 struct xfs_btree_cur *cur;
448 int error;
449
450 /* Load the incore bmap cache if it's not loaded. */
451 info->was_loaded = !xfs_need_iread_extents(ifp);
452
453 error = xfs_iread_extents(sc->tp, ip, whichfork);
454 if (!xchk_fblock_process_error(sc, whichfork, 0, &error))
455 goto out;
456
457 /* Check the btree structure. */
458 cur = xfs_bmbt_init_cursor(mp, sc->tp, ip, whichfork);
459 xfs_rmap_ino_bmbt_owner(&oinfo, ip->i_ino, whichfork);
460 error = xchk_btree(sc, cur, xchk_bmapbt_rec, &oinfo, info);
461 xfs_btree_del_cursor(cur, error);
462out:
463 return error;
464}
465
466struct xchk_bmap_check_rmap_info {
467 struct xfs_scrub *sc;
468 int whichfork;
469 struct xfs_iext_cursor icur;
470};
471
472/* Can we find bmaps that fit this rmap? */
473STATIC int
474xchk_bmap_check_rmap(
475 struct xfs_btree_cur *cur,
476 struct xfs_rmap_irec *rec,
477 void *priv)
478{
479 struct xfs_bmbt_irec irec;
480 struct xchk_bmap_check_rmap_info *sbcri = priv;
481 struct xfs_ifork *ifp;
482 struct xfs_scrub *sc = sbcri->sc;
483 bool have_map;
484
485 /* Is this even the right fork? */
486 if (rec->rm_owner != sc->ip->i_ino)
487 return 0;
488 if ((sbcri->whichfork == XFS_ATTR_FORK) ^
489 !!(rec->rm_flags & XFS_RMAP_ATTR_FORK))
490 return 0;
491 if (rec->rm_flags & XFS_RMAP_BMBT_BLOCK)
492 return 0;
493
494 /* Now look up the bmbt record. */
495 ifp = XFS_IFORK_PTR(sc->ip, sbcri->whichfork);
496 if (!ifp) {
497 xchk_fblock_set_corrupt(sc, sbcri->whichfork,
498 rec->rm_offset);
499 goto out;
500 }
501 have_map = xfs_iext_lookup_extent(sc->ip, ifp, rec->rm_offset,
502 &sbcri->icur, &irec);
503 if (!have_map)
504 xchk_fblock_set_corrupt(sc, sbcri->whichfork,
505 rec->rm_offset);
506 /*
507 * bmap extent record lengths are constrained to 2^21 blocks in length
508 * because of space constraints in the on-disk metadata structure.
509 * However, rmap extent record lengths are constrained only by AG
510 * length, so we have to loop through the bmbt to make sure that the
511 * entire rmap is covered by bmbt records.
512 */
513 while (have_map) {
514 if (irec.br_startoff != rec->rm_offset)
515 xchk_fblock_set_corrupt(sc, sbcri->whichfork,
516 rec->rm_offset);
517 if (irec.br_startblock != XFS_AGB_TO_FSB(sc->mp,
518 cur->bc_ag.pag->pag_agno, rec->rm_startblock))
519 xchk_fblock_set_corrupt(sc, sbcri->whichfork,
520 rec->rm_offset);
521 if (irec.br_blockcount > rec->rm_blockcount)
522 xchk_fblock_set_corrupt(sc, sbcri->whichfork,
523 rec->rm_offset);
524 if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
525 break;
526 rec->rm_startblock += irec.br_blockcount;
527 rec->rm_offset += irec.br_blockcount;
528 rec->rm_blockcount -= irec.br_blockcount;
529 if (rec->rm_blockcount == 0)
530 break;
531 have_map = xfs_iext_next_extent(ifp, &sbcri->icur, &irec);
532 if (!have_map)
533 xchk_fblock_set_corrupt(sc, sbcri->whichfork,
534 rec->rm_offset);
535 }
536
537out:
538 if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
539 return -ECANCELED;
540 return 0;
541}
542
543/* Make sure each rmap has a corresponding bmbt entry. */
544STATIC int
545xchk_bmap_check_ag_rmaps(
546 struct xfs_scrub *sc,
547 int whichfork,
548 struct xfs_perag *pag)
549{
550 struct xchk_bmap_check_rmap_info sbcri;
551 struct xfs_btree_cur *cur;
552 struct xfs_buf *agf;
553 int error;
554
555 error = xfs_alloc_read_agf(sc->mp, sc->tp, pag->pag_agno, 0, &agf);
556 if (error)
557 return error;
558
559 cur = xfs_rmapbt_init_cursor(sc->mp, sc->tp, agf, pag);
560
561 sbcri.sc = sc;
562 sbcri.whichfork = whichfork;
563 error = xfs_rmap_query_all(cur, xchk_bmap_check_rmap, &sbcri);
564 if (error == -ECANCELED)
565 error = 0;
566
567 xfs_btree_del_cursor(cur, error);
568 xfs_trans_brelse(sc->tp, agf);
569 return error;
570}
571
572/* Make sure each rmap has a corresponding bmbt entry. */
573STATIC int
574xchk_bmap_check_rmaps(
575 struct xfs_scrub *sc,
576 int whichfork)
577{
578 struct xfs_ifork *ifp = XFS_IFORK_PTR(sc->ip, whichfork);
579 struct xfs_perag *pag;
580 xfs_agnumber_t agno;
581 bool zero_size;
582 int error;
583
584 if (!xfs_sb_version_hasrmapbt(&sc->mp->m_sb) ||
585 whichfork == XFS_COW_FORK ||
586 (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
587 return 0;
588
589 /* Don't support realtime rmap checks yet. */
590 if (XFS_IS_REALTIME_INODE(sc->ip) && whichfork == XFS_DATA_FORK)
591 return 0;
592
593 ASSERT(XFS_IFORK_PTR(sc->ip, whichfork) != NULL);
594
595 /*
596 * Only do this for complex maps that are in btree format, or for
597 * situations where we would seem to have a size but zero extents.
598 * The inode repair code can zap broken iforks, which means we have
599 * to flag this bmap as corrupt if there are rmaps that need to be
600 * reattached.
601 */
602
603 if (whichfork == XFS_DATA_FORK)
604 zero_size = i_size_read(VFS_I(sc->ip)) == 0;
605 else
606 zero_size = false;
607
608 if (ifp->if_format != XFS_DINODE_FMT_BTREE &&
609 (zero_size || ifp->if_nextents > 0))
610 return 0;
611
612 for_each_perag(sc->mp, agno, pag) {
613 error = xchk_bmap_check_ag_rmaps(sc, whichfork, pag);
614 if (error)
615 break;
616 if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
617 break;
618 }
619 if (pag)
620 xfs_perag_put(pag);
621 return error;
622}
623
624/*
625 * Scrub an inode fork's block mappings.
626 *
627 * First we scan every record in every btree block, if applicable.
628 * Then we unconditionally scan the incore extent cache.
629 */
630STATIC int
631xchk_bmap(
632 struct xfs_scrub *sc,
633 int whichfork)
634{
635 struct xfs_bmbt_irec irec;
636 struct xchk_bmap_info info = { NULL };
637 struct xfs_mount *mp = sc->mp;
638 struct xfs_inode *ip = sc->ip;
639 struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
640 xfs_fileoff_t endoff;
641 struct xfs_iext_cursor icur;
642 int error = 0;
643
644 /* Non-existent forks can be ignored. */
645 if (!ifp)
646 goto out;
647
648 info.is_rt = whichfork == XFS_DATA_FORK && XFS_IS_REALTIME_INODE(ip);
649 info.whichfork = whichfork;
650 info.is_shared = whichfork == XFS_DATA_FORK && xfs_is_reflink_inode(ip);
651 info.sc = sc;
652
653 switch (whichfork) {
654 case XFS_COW_FORK:
655 /* No CoW forks on non-reflink inodes/filesystems. */
656 if (!xfs_is_reflink_inode(ip)) {
657 xchk_ino_set_corrupt(sc, sc->ip->i_ino);
658 goto out;
659 }
660 break;
661 case XFS_ATTR_FORK:
662 if (!xfs_sb_version_hasattr(&mp->m_sb) &&
663 !xfs_sb_version_hasattr2(&mp->m_sb))
664 xchk_ino_set_corrupt(sc, sc->ip->i_ino);
665 break;
666 default:
667 ASSERT(whichfork == XFS_DATA_FORK);
668 break;
669 }
670
671 /* Check the fork values */
672 switch (ifp->if_format) {
673 case XFS_DINODE_FMT_UUID:
674 case XFS_DINODE_FMT_DEV:
675 case XFS_DINODE_FMT_LOCAL:
676 /* No mappings to check. */
677 goto out;
678 case XFS_DINODE_FMT_EXTENTS:
679 break;
680 case XFS_DINODE_FMT_BTREE:
681 if (whichfork == XFS_COW_FORK) {
682 xchk_fblock_set_corrupt(sc, whichfork, 0);
683 goto out;
684 }
685
686 error = xchk_bmap_btree(sc, whichfork, &info);
687 if (error)
688 goto out;
689 break;
690 default:
691 xchk_fblock_set_corrupt(sc, whichfork, 0);
692 goto out;
693 }
694
695 if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
696 goto out;
697
698 /* Find the offset of the last extent in the mapping. */
699 error = xfs_bmap_last_offset(ip, &endoff, whichfork);
700 if (!xchk_fblock_process_error(sc, whichfork, 0, &error))
701 goto out;
702
703 /* Scrub extent records. */
704 info.lastoff = 0;
705 ifp = XFS_IFORK_PTR(ip, whichfork);
706 for_each_xfs_iext(ifp, &icur, &irec) {
707 if (xchk_should_terminate(sc, &error) ||
708 (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
709 goto out;
710 if (isnullstartblock(irec.br_startblock))
711 continue;
712 if (irec.br_startoff >= endoff) {
713 xchk_fblock_set_corrupt(sc, whichfork,
714 irec.br_startoff);
715 goto out;
716 }
717 error = xchk_bmap_iextent(ip, &info, &irec);
718 if (error)
719 goto out;
720 }
721
722 error = xchk_bmap_check_rmaps(sc, whichfork);
723 if (!xchk_fblock_xref_process_error(sc, whichfork, 0, &error))
724 goto out;
725out:
726 return error;
727}
728
729/* Scrub an inode's data fork. */
730int
731xchk_bmap_data(
732 struct xfs_scrub *sc)
733{
734 return xchk_bmap(sc, XFS_DATA_FORK);
735}
736
737/* Scrub an inode's attr fork. */
738int
739xchk_bmap_attr(
740 struct xfs_scrub *sc)
741{
742 return xchk_bmap(sc, XFS_ATTR_FORK);
743}
744
745/* Scrub an inode's CoW fork. */
746int
747xchk_bmap_cow(
748 struct xfs_scrub *sc)
749{
750 if (!xfs_is_reflink_inode(sc->ip))
751 return -ENOENT;
752
753 return xchk_bmap(sc, XFS_COW_FORK);
754}