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