1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2017-2023 Oracle. All Rights Reserved.
4 * Author: Darrick J. Wong <djwong@kernel.org>
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_log_format.h"
14 #include "xfs_trans.h"
15 #include "xfs_ag.h"
16 #include "xfs_inode.h"
17 #include "xfs_ialloc.h"
18 #include "xfs_icache.h"
19 #include "xfs_da_format.h"
20 #include "xfs_reflink.h"
21 #include "xfs_rmap.h"
22 #include "xfs_bmap_util.h"
23 #include "xfs_rtbitmap.h"
24 #include "scrub/scrub.h"
25 #include "scrub/common.h"
26 #include "scrub/btree.h"
27 #include "scrub/trace.h"
28 #include "scrub/repair.h"
29
30 /* Prepare the attached inode for scrubbing. */
31 static inline int
xchk_prepare_iscrub(struct xfs_scrub * sc)32 xchk_prepare_iscrub(
33 struct xfs_scrub *sc)
34 {
35 int error;
36
37 xchk_ilock(sc, XFS_IOLOCK_EXCL);
38
39 error = xchk_trans_alloc(sc, 0);
40 if (error)
41 return error;
42
43 error = xchk_ino_dqattach(sc);
44 if (error)
45 return error;
46
47 xchk_ilock(sc, XFS_ILOCK_EXCL);
48 return 0;
49 }
50
51 /* Install this scrub-by-handle inode and prepare it for scrubbing. */
52 static inline int
xchk_install_handle_iscrub(struct xfs_scrub * sc,struct xfs_inode * ip)53 xchk_install_handle_iscrub(
54 struct xfs_scrub *sc,
55 struct xfs_inode *ip)
56 {
57 int error;
58
59 error = xchk_install_handle_inode(sc, ip);
60 if (error)
61 return error;
62
63 /*
64 * Don't allow scrubbing by handle of any non-directory inode records
65 * in the metadata directory tree. We don't know if any of the scans
66 * launched by this scrubber will end up indirectly trying to lock this
67 * file.
68 *
69 * Scrubbers of inode-rooted metadata files (e.g. quota files) will
70 * attach all the resources needed to scrub the inode and call
71 * xchk_inode directly. Userspace cannot call this directly.
72 */
73 if (xfs_is_metadir_inode(ip) && !S_ISDIR(VFS_I(ip)->i_mode)) {
74 xchk_irele(sc, ip);
75 sc->ip = NULL;
76 return -ENOENT;
77 }
78
79 return xchk_prepare_iscrub(sc);
80 }
81
82 /*
83 * Grab total control of the inode metadata. In the best case, we grab the
84 * incore inode and take all locks on it. If the incore inode cannot be
85 * constructed due to corruption problems, lock the AGI so that we can single
86 * step the loading process to fix everything that can go wrong.
87 */
88 int
xchk_setup_inode(struct xfs_scrub * sc)89 xchk_setup_inode(
90 struct xfs_scrub *sc)
91 {
92 struct xfs_imap imap;
93 struct xfs_inode *ip;
94 struct xfs_mount *mp = sc->mp;
95 struct xfs_inode *ip_in = XFS_I(file_inode(sc->file));
96 struct xfs_buf *agi_bp;
97 struct xfs_perag *pag;
98 xfs_agnumber_t agno = XFS_INO_TO_AGNO(mp, sc->sm->sm_ino);
99 int error;
100
101 if (xchk_need_intent_drain(sc))
102 xchk_fsgates_enable(sc, XCHK_FSGATES_DRAIN);
103
104 /* We want to scan the opened inode, so lock it and exit. */
105 if (sc->sm->sm_ino == 0 || sc->sm->sm_ino == ip_in->i_ino) {
106 error = xchk_install_live_inode(sc, ip_in);
107 if (error)
108 return error;
109
110 return xchk_prepare_iscrub(sc);
111 }
112
113 /*
114 * On pre-metadir filesystems, reject internal metadata files. For
115 * metadir filesystems, limited scrubbing of any file in the metadata
116 * directory tree by handle is allowed, because that is the only way to
117 * validate the lack of parent pointers in the sb-root metadata inodes.
118 */
119 if (!xfs_has_metadir(mp) && xfs_is_sb_inum(mp, sc->sm->sm_ino))
120 return -ENOENT;
121 /* Reject obviously bad inode numbers. */
122 if (!xfs_verify_ino(sc->mp, sc->sm->sm_ino))
123 return -ENOENT;
124
125 /* Try a safe untrusted iget. */
126 error = xchk_iget_safe(sc, sc->sm->sm_ino, &ip);
127 if (!error)
128 return xchk_install_handle_iscrub(sc, ip);
129 if (error == -ENOENT)
130 return error;
131 if (error != -EFSCORRUPTED && error != -EFSBADCRC && error != -EINVAL)
132 goto out_error;
133
134 /*
135 * EINVAL with IGET_UNTRUSTED probably means one of several things:
136 * userspace gave us an inode number that doesn't correspond to fs
137 * space; the inode btree lacks a record for this inode; or there is
138 * a record, and it says this inode is free.
139 *
140 * EFSCORRUPTED/EFSBADCRC could mean that the inode was mappable, but
141 * some other metadata corruption (e.g. inode forks) prevented
142 * instantiation of the incore inode. Or it could mean the inobt is
143 * corrupt.
144 *
145 * We want to look up this inode in the inobt directly to distinguish
146 * three different scenarios: (1) the inobt says the inode is free,
147 * in which case there's nothing to do; (2) the inobt is corrupt so we
148 * should flag the corruption and exit to userspace to let it fix the
149 * inobt; and (3) the inobt says the inode is allocated, but loading it
150 * failed due to corruption.
151 *
152 * Allocate a transaction and grab the AGI to prevent inobt activity in
153 * this AG. Retry the iget in case someone allocated a new inode after
154 * the first iget failed.
155 */
156 error = xchk_trans_alloc(sc, 0);
157 if (error)
158 goto out_error;
159
160 error = xchk_iget_agi(sc, sc->sm->sm_ino, &agi_bp, &ip);
161 if (error == 0) {
162 /* Actually got the incore inode, so install it and proceed. */
163 xchk_trans_cancel(sc);
164 return xchk_install_handle_iscrub(sc, ip);
165 }
166 if (error == -ENOENT)
167 goto out_gone;
168 if (error != -EFSCORRUPTED && error != -EFSBADCRC && error != -EINVAL)
169 goto out_cancel;
170
171 /* Ensure that we have protected against inode allocation/freeing. */
172 if (agi_bp == NULL) {
173 ASSERT(agi_bp != NULL);
174 error = -ECANCELED;
175 goto out_cancel;
176 }
177
178 /*
179 * Untrusted iget failed a second time. Let's try an inobt lookup.
180 * If the inobt doesn't think this is an allocated inode then we'll
181 * return ENOENT to signal that the check can be skipped.
182 *
183 * If the lookup signals corruption, we'll mark this inode corrupt and
184 * exit to userspace. There's little chance of fixing anything until
185 * the inobt is straightened out, but there's nothing we can do here.
186 *
187 * If the lookup encounters a runtime error, exit to userspace.
188 */
189 pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, sc->sm->sm_ino));
190 if (!pag) {
191 error = -EFSCORRUPTED;
192 goto out_cancel;
193 }
194
195 error = xfs_imap(pag, sc->tp, sc->sm->sm_ino, &imap,
196 XFS_IGET_UNTRUSTED);
197 xfs_perag_put(pag);
198 if (error == -EINVAL || error == -ENOENT)
199 goto out_gone;
200 if (error)
201 goto out_cancel;
202
203 /*
204 * The lookup succeeded. Chances are the ondisk inode is corrupt and
205 * preventing iget from reading it. Retain the scrub transaction and
206 * the AGI buffer to prevent anyone from allocating or freeing inodes.
207 * This ensures that we preserve the inconsistency between the inobt
208 * saying the inode is allocated and the icache being unable to load
209 * the inode until we can flag the corruption in xchk_inode. The
210 * scrub function has to note the corruption, since we're not really
211 * supposed to do that from the setup function. Save the mapping to
212 * make repairs to the ondisk inode buffer.
213 */
214 if (xchk_could_repair(sc))
215 xrep_setup_inode(sc, &imap);
216 return 0;
217
218 out_cancel:
219 xchk_trans_cancel(sc);
220 out_error:
221 trace_xchk_op_error(sc, agno, XFS_INO_TO_AGBNO(mp, sc->sm->sm_ino),
222 error, __return_address);
223 return error;
224 out_gone:
225 /* The file is gone, so there's nothing to check. */
226 xchk_trans_cancel(sc);
227 return -ENOENT;
228 }
229
230 /* Inode core */
231
232 /* Validate di_extsize hint. */
233 STATIC void
xchk_inode_extsize(struct xfs_scrub * sc,struct xfs_dinode * dip,xfs_ino_t ino,uint16_t mode,uint16_t flags)234 xchk_inode_extsize(
235 struct xfs_scrub *sc,
236 struct xfs_dinode *dip,
237 xfs_ino_t ino,
238 uint16_t mode,
239 uint16_t flags)
240 {
241 xfs_failaddr_t fa;
242 uint32_t value = be32_to_cpu(dip->di_extsize);
243
244 fa = xfs_inode_validate_extsize(sc->mp, value, mode, flags);
245 if (fa)
246 xchk_ino_set_corrupt(sc, ino);
247
248 /*
249 * XFS allows a sysadmin to change the rt extent size when adding a rt
250 * section to a filesystem after formatting. If there are any
251 * directories with extszinherit and rtinherit set, the hint could
252 * become misaligned with the new rextsize. The verifier doesn't check
253 * this, because we allow rtinherit directories even without an rt
254 * device. Flag this as an administrative warning since we will clean
255 * this up eventually.
256 */
257 if ((flags & XFS_DIFLAG_RTINHERIT) &&
258 (flags & XFS_DIFLAG_EXTSZINHERIT) &&
259 xfs_extlen_to_rtxmod(sc->mp, value) > 0)
260 xchk_ino_set_warning(sc, ino);
261 }
262
263 /* Validate di_cowextsize hint. */
264 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)265 xchk_inode_cowextsize(
266 struct xfs_scrub *sc,
267 struct xfs_dinode *dip,
268 xfs_ino_t ino,
269 uint16_t mode,
270 uint16_t flags,
271 uint64_t flags2)
272 {
273 xfs_failaddr_t fa;
274 uint32_t value = be32_to_cpu(dip->di_cowextsize);
275
276 /*
277 * The used block counter for rtrmap is checked and repaired elsewhere.
278 */
279 if (xfs_has_zoned(sc->mp) &&
280 dip->di_metatype == cpu_to_be16(XFS_METAFILE_RTRMAP))
281 return;
282
283 fa = xfs_inode_validate_cowextsize(sc->mp, value, mode, flags, flags2);
284 if (fa)
285 xchk_ino_set_corrupt(sc, ino);
286
287 /*
288 * XFS allows a sysadmin to change the rt extent size when adding a rt
289 * section to a filesystem after formatting. If there are any
290 * directories with cowextsize and rtinherit set, the hint could become
291 * misaligned with the new rextsize. The verifier doesn't check this,
292 * because we allow rtinherit directories even without an rt device.
293 * Flag this as an administrative warning since we will clean this up
294 * eventually.
295 */
296 if ((flags & XFS_DIFLAG_RTINHERIT) &&
297 (flags2 & XFS_DIFLAG2_COWEXTSIZE) &&
298 value % sc->mp->m_sb.sb_rextsize > 0)
299 xchk_ino_set_warning(sc, ino);
300 }
301
302 /* Make sure the di_flags make sense for the inode. */
303 STATIC void
xchk_inode_flags(struct xfs_scrub * sc,struct xfs_dinode * dip,xfs_ino_t ino,uint16_t mode,uint16_t flags)304 xchk_inode_flags(
305 struct xfs_scrub *sc,
306 struct xfs_dinode *dip,
307 xfs_ino_t ino,
308 uint16_t mode,
309 uint16_t flags)
310 {
311 struct xfs_mount *mp = sc->mp;
312
313 /* di_flags are all taken, last bit cannot be used */
314 if (flags & ~XFS_DIFLAG_ANY)
315 goto bad;
316
317 /* rt flags require rt device */
318 if ((flags & XFS_DIFLAG_REALTIME) && !mp->m_rtdev_targp)
319 goto bad;
320
321 /* new rt bitmap flag only valid for rbmino */
322 if ((flags & XFS_DIFLAG_NEWRTBM) && ino != mp->m_sb.sb_rbmino)
323 goto bad;
324
325 /* directory-only flags */
326 if ((flags & (XFS_DIFLAG_RTINHERIT |
327 XFS_DIFLAG_EXTSZINHERIT |
328 XFS_DIFLAG_PROJINHERIT |
329 XFS_DIFLAG_NOSYMLINKS)) &&
330 !S_ISDIR(mode))
331 goto bad;
332
333 /* file-only flags */
334 if ((flags & (XFS_DIFLAG_REALTIME | FS_XFLAG_EXTSIZE)) &&
335 !S_ISREG(mode))
336 goto bad;
337
338 /* filestreams and rt make no sense */
339 if ((flags & XFS_DIFLAG_FILESTREAM) && (flags & XFS_DIFLAG_REALTIME))
340 goto bad;
341
342 return;
343 bad:
344 xchk_ino_set_corrupt(sc, ino);
345 }
346
347 /* Make sure the di_flags2 make sense for the inode. */
348 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)349 xchk_inode_flags2(
350 struct xfs_scrub *sc,
351 struct xfs_dinode *dip,
352 xfs_ino_t ino,
353 uint16_t mode,
354 uint16_t flags,
355 uint64_t flags2)
356 {
357 struct xfs_mount *mp = sc->mp;
358
359 /* Unknown di_flags2 could be from a future kernel */
360 if (flags2 & ~XFS_DIFLAG2_ANY)
361 xchk_ino_set_warning(sc, ino);
362
363 /* reflink flag requires reflink feature */
364 if ((flags2 & XFS_DIFLAG2_REFLINK) &&
365 !xfs_has_reflink(mp))
366 goto bad;
367
368 /* cowextsize flag is checked w.r.t. mode separately */
369
370 /* file/dir-only flags */
371 if ((flags2 & XFS_DIFLAG2_DAX) && !(S_ISREG(mode) || S_ISDIR(mode)))
372 goto bad;
373
374 /* file-only flags */
375 if ((flags2 & XFS_DIFLAG2_REFLINK) && !S_ISREG(mode))
376 goto bad;
377
378 /* realtime and reflink don't always go together */
379 if ((flags & XFS_DIFLAG_REALTIME) && (flags2 & XFS_DIFLAG2_REFLINK) &&
380 !xfs_has_rtreflink(mp))
381 goto bad;
382
383 /* no bigtime iflag without the bigtime feature */
384 if (xfs_dinode_has_bigtime(dip) && !xfs_has_bigtime(mp))
385 goto bad;
386
387 /* no large extent counts without the filesystem feature */
388 if ((flags2 & XFS_DIFLAG2_NREXT64) && !xfs_has_large_extent_counts(mp))
389 goto bad;
390
391 return;
392 bad:
393 xchk_ino_set_corrupt(sc, ino);
394 }
395
396 static inline void
xchk_dinode_nsec(struct xfs_scrub * sc,xfs_ino_t ino,struct xfs_dinode * dip,const xfs_timestamp_t ts)397 xchk_dinode_nsec(
398 struct xfs_scrub *sc,
399 xfs_ino_t ino,
400 struct xfs_dinode *dip,
401 const xfs_timestamp_t ts)
402 {
403 struct timespec64 tv;
404
405 tv = xfs_inode_from_disk_ts(dip, ts);
406 if (tv.tv_nsec < 0 || tv.tv_nsec >= NSEC_PER_SEC)
407 xchk_ino_set_corrupt(sc, ino);
408 }
409
410 /* Scrub all the ondisk inode fields. */
411 STATIC void
xchk_dinode(struct xfs_scrub * sc,struct xfs_dinode * dip,xfs_ino_t ino)412 xchk_dinode(
413 struct xfs_scrub *sc,
414 struct xfs_dinode *dip,
415 xfs_ino_t ino)
416 {
417 struct xfs_mount *mp = sc->mp;
418 size_t fork_recs;
419 unsigned long long isize;
420 uint64_t flags2;
421 xfs_extnum_t nextents;
422 xfs_extnum_t naextents;
423 prid_t prid;
424 uint16_t flags;
425 uint16_t mode;
426
427 flags = be16_to_cpu(dip->di_flags);
428 if (dip->di_version >= 3)
429 flags2 = be64_to_cpu(dip->di_flags2);
430 else
431 flags2 = 0;
432
433 /* di_mode */
434 mode = be16_to_cpu(dip->di_mode);
435 switch (mode & S_IFMT) {
436 case S_IFLNK:
437 case S_IFREG:
438 case S_IFDIR:
439 case S_IFCHR:
440 case S_IFBLK:
441 case S_IFIFO:
442 case S_IFSOCK:
443 /* mode is recognized */
444 break;
445 default:
446 xchk_ino_set_corrupt(sc, ino);
447 break;
448 }
449
450 /* v1/v2 fields */
451 switch (dip->di_version) {
452 case 1:
453 /*
454 * We autoconvert v1 inodes into v2 inodes on writeout,
455 * so just mark this inode for preening.
456 */
457 xchk_ino_set_preen(sc, ino);
458 prid = 0;
459 break;
460 case 2:
461 case 3:
462 if (xfs_dinode_is_metadir(dip)) {
463 if (be16_to_cpu(dip->di_metatype) >= XFS_METAFILE_MAX)
464 xchk_ino_set_corrupt(sc, ino);
465 } else {
466 if (dip->di_metatype != 0)
467 xchk_ino_set_corrupt(sc, ino);
468 }
469
470 if (dip->di_mode == 0 && sc->ip)
471 xchk_ino_set_corrupt(sc, ino);
472
473 if (dip->di_projid_hi != 0 &&
474 !xfs_has_projid32(mp))
475 xchk_ino_set_corrupt(sc, ino);
476
477 prid = be16_to_cpu(dip->di_projid_lo);
478 break;
479 default:
480 xchk_ino_set_corrupt(sc, ino);
481 return;
482 }
483
484 if (xfs_has_projid32(mp))
485 prid |= (prid_t)be16_to_cpu(dip->di_projid_hi) << 16;
486
487 /*
488 * di_uid/di_gid -- -1 isn't invalid, but there's no way that
489 * userspace could have created that.
490 */
491 if (dip->di_uid == cpu_to_be32(-1U) ||
492 dip->di_gid == cpu_to_be32(-1U))
493 xchk_ino_set_warning(sc, ino);
494
495 /*
496 * project id of -1 isn't supposed to be valid, but the kernel didn't
497 * always validate that.
498 */
499 if (prid == -1U)
500 xchk_ino_set_warning(sc, ino);
501
502 /* di_format */
503 switch (dip->di_format) {
504 case XFS_DINODE_FMT_DEV:
505 if (!S_ISCHR(mode) && !S_ISBLK(mode) &&
506 !S_ISFIFO(mode) && !S_ISSOCK(mode))
507 xchk_ino_set_corrupt(sc, ino);
508 break;
509 case XFS_DINODE_FMT_LOCAL:
510 if (!S_ISDIR(mode) && !S_ISLNK(mode))
511 xchk_ino_set_corrupt(sc, ino);
512 break;
513 case XFS_DINODE_FMT_EXTENTS:
514 if (!S_ISREG(mode) && !S_ISDIR(mode) && !S_ISLNK(mode))
515 xchk_ino_set_corrupt(sc, ino);
516 break;
517 case XFS_DINODE_FMT_BTREE:
518 if (!S_ISREG(mode) && !S_ISDIR(mode))
519 xchk_ino_set_corrupt(sc, ino);
520 break;
521 case XFS_DINODE_FMT_META_BTREE:
522 if (!S_ISREG(mode))
523 xchk_ino_set_corrupt(sc, ino);
524 break;
525 case XFS_DINODE_FMT_UUID:
526 default:
527 xchk_ino_set_corrupt(sc, ino);
528 break;
529 }
530
531 /* di_[amc]time.nsec */
532 xchk_dinode_nsec(sc, ino, dip, dip->di_atime);
533 xchk_dinode_nsec(sc, ino, dip, dip->di_mtime);
534 xchk_dinode_nsec(sc, ino, dip, dip->di_ctime);
535
536 /*
537 * di_size. xfs_dinode_verify checks for things that screw up
538 * the VFS such as the upper bit being set and zero-length
539 * symlinks/directories, but we can do more here.
540 */
541 isize = be64_to_cpu(dip->di_size);
542 if (isize & (1ULL << 63))
543 xchk_ino_set_corrupt(sc, ino);
544
545 /* Devices, fifos, and sockets must have zero size */
546 if (!S_ISDIR(mode) && !S_ISREG(mode) && !S_ISLNK(mode) && isize != 0)
547 xchk_ino_set_corrupt(sc, ino);
548
549 /* Directories can't be larger than the data section size (32G) */
550 if (S_ISDIR(mode) && (isize == 0 || isize >= XFS_DIR2_SPACE_SIZE))
551 xchk_ino_set_corrupt(sc, ino);
552
553 /* Symlinks can't be larger than SYMLINK_MAXLEN */
554 if (S_ISLNK(mode) && (isize == 0 || isize >= XFS_SYMLINK_MAXLEN))
555 xchk_ino_set_corrupt(sc, ino);
556
557 /*
558 * Warn if the running kernel can't handle the kinds of offsets
559 * needed to deal with the file size. In other words, if the
560 * pagecache can't cache all the blocks in this file due to
561 * overly large offsets, flag the inode for admin review.
562 */
563 if (isize > mp->m_super->s_maxbytes)
564 xchk_ino_set_warning(sc, ino);
565
566 /* di_nblocks */
567 if (flags2 & XFS_DIFLAG2_REFLINK) {
568 ; /* nblocks can exceed dblocks */
569 } else if (flags & XFS_DIFLAG_REALTIME) {
570 /*
571 * nblocks is the sum of data extents (in the rtdev),
572 * attr extents (in the datadev), and both forks' bmbt
573 * blocks (in the datadev). This clumsy check is the
574 * best we can do without cross-referencing with the
575 * inode forks.
576 */
577 if (be64_to_cpu(dip->di_nblocks) >=
578 mp->m_sb.sb_dblocks + mp->m_sb.sb_rblocks)
579 xchk_ino_set_corrupt(sc, ino);
580 } else {
581 if (be64_to_cpu(dip->di_nblocks) >= mp->m_sb.sb_dblocks)
582 xchk_ino_set_corrupt(sc, ino);
583 }
584
585 xchk_inode_flags(sc, dip, ino, mode, flags);
586
587 xchk_inode_extsize(sc, dip, ino, mode, flags);
588
589 nextents = xfs_dfork_data_extents(dip);
590 naextents = xfs_dfork_attr_extents(dip);
591
592 /* di_nextents */
593 fork_recs = XFS_DFORK_DSIZE(dip, mp) / sizeof(struct xfs_bmbt_rec);
594 switch (dip->di_format) {
595 case XFS_DINODE_FMT_EXTENTS:
596 if (nextents > fork_recs)
597 xchk_ino_set_corrupt(sc, ino);
598 break;
599 case XFS_DINODE_FMT_BTREE:
600 if (nextents <= fork_recs)
601 xchk_ino_set_corrupt(sc, ino);
602 break;
603 default:
604 if (nextents != 0)
605 xchk_ino_set_corrupt(sc, ino);
606 break;
607 }
608
609 /* di_forkoff */
610 if (XFS_DFORK_BOFF(dip) >= mp->m_sb.sb_inodesize)
611 xchk_ino_set_corrupt(sc, ino);
612 if (naextents != 0 && dip->di_forkoff == 0)
613 xchk_ino_set_corrupt(sc, ino);
614 if (dip->di_forkoff == 0 && dip->di_aformat != XFS_DINODE_FMT_EXTENTS)
615 xchk_ino_set_corrupt(sc, ino);
616
617 /* di_aformat */
618 if (dip->di_aformat != XFS_DINODE_FMT_LOCAL &&
619 dip->di_aformat != XFS_DINODE_FMT_EXTENTS &&
620 dip->di_aformat != XFS_DINODE_FMT_BTREE)
621 xchk_ino_set_corrupt(sc, ino);
622
623 /* di_anextents */
624 fork_recs = XFS_DFORK_ASIZE(dip, mp) / sizeof(struct xfs_bmbt_rec);
625 switch (dip->di_aformat) {
626 case XFS_DINODE_FMT_EXTENTS:
627 if (naextents > fork_recs)
628 xchk_ino_set_corrupt(sc, ino);
629 break;
630 case XFS_DINODE_FMT_BTREE:
631 if (naextents <= fork_recs)
632 xchk_ino_set_corrupt(sc, ino);
633 break;
634 default:
635 if (naextents != 0)
636 xchk_ino_set_corrupt(sc, ino);
637 }
638
639 if (dip->di_version >= 3) {
640 xchk_dinode_nsec(sc, ino, dip, dip->di_crtime);
641 xchk_inode_flags2(sc, dip, ino, mode, flags, flags2);
642 xchk_inode_cowextsize(sc, dip, ino, mode, flags,
643 flags2);
644 }
645 }
646
647 /*
648 * Make sure the finobt doesn't think this inode is free.
649 * We don't have to check the inobt ourselves because we got the inode via
650 * IGET_UNTRUSTED, which checks the inobt for us.
651 */
652 static void
xchk_inode_xref_finobt(struct xfs_scrub * sc,xfs_ino_t ino)653 xchk_inode_xref_finobt(
654 struct xfs_scrub *sc,
655 xfs_ino_t ino)
656 {
657 struct xfs_inobt_rec_incore rec;
658 xfs_agino_t agino;
659 int has_record;
660 int error;
661
662 if (!sc->sa.fino_cur || xchk_skip_xref(sc->sm))
663 return;
664
665 agino = XFS_INO_TO_AGINO(sc->mp, ino);
666
667 /*
668 * Try to get the finobt record. If we can't get it, then we're
669 * in good shape.
670 */
671 error = xfs_inobt_lookup(sc->sa.fino_cur, agino, XFS_LOOKUP_LE,
672 &has_record);
673 if (!xchk_should_check_xref(sc, &error, &sc->sa.fino_cur) ||
674 !has_record)
675 return;
676
677 error = xfs_inobt_get_rec(sc->sa.fino_cur, &rec, &has_record);
678 if (!xchk_should_check_xref(sc, &error, &sc->sa.fino_cur) ||
679 !has_record)
680 return;
681
682 /*
683 * Otherwise, make sure this record either doesn't cover this inode,
684 * or that it does but it's marked present.
685 */
686 if (rec.ir_startino > agino ||
687 rec.ir_startino + XFS_INODES_PER_CHUNK <= agino)
688 return;
689
690 if (rec.ir_free & XFS_INOBT_MASK(agino - rec.ir_startino))
691 xchk_btree_xref_set_corrupt(sc, sc->sa.fino_cur, 0);
692 }
693
694 /* Cross reference the inode fields with the forks. */
695 STATIC void
xchk_inode_xref_bmap(struct xfs_scrub * sc,struct xfs_dinode * dip)696 xchk_inode_xref_bmap(
697 struct xfs_scrub *sc,
698 struct xfs_dinode *dip)
699 {
700 xfs_extnum_t nextents;
701 xfs_filblks_t count;
702 xfs_filblks_t acount;
703 int error;
704
705 if (xchk_skip_xref(sc->sm))
706 return;
707
708 /* Walk all the extents to check nextents/naextents/nblocks. */
709 error = xchk_inode_count_blocks(sc, XFS_DATA_FORK, &nextents, &count);
710 if (!xchk_should_check_xref(sc, &error, NULL))
711 return;
712 if (nextents < xfs_dfork_data_extents(dip))
713 xchk_ino_xref_set_corrupt(sc, sc->ip->i_ino);
714
715 error = xchk_inode_count_blocks(sc, XFS_ATTR_FORK, &nextents, &acount);
716 if (!xchk_should_check_xref(sc, &error, NULL))
717 return;
718 if (nextents != xfs_dfork_attr_extents(dip))
719 xchk_ino_xref_set_corrupt(sc, sc->ip->i_ino);
720
721 /* Check nblocks against the inode. */
722 if (count + acount != be64_to_cpu(dip->di_nblocks))
723 xchk_ino_xref_set_corrupt(sc, sc->ip->i_ino);
724 }
725
726 /* Cross-reference with the other btrees. */
727 STATIC void
xchk_inode_xref(struct xfs_scrub * sc,xfs_ino_t ino,struct xfs_dinode * dip)728 xchk_inode_xref(
729 struct xfs_scrub *sc,
730 xfs_ino_t ino,
731 struct xfs_dinode *dip)
732 {
733 xfs_agnumber_t agno;
734 xfs_agblock_t agbno;
735 int error;
736
737 if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
738 return;
739
740 agno = XFS_INO_TO_AGNO(sc->mp, ino);
741 agbno = XFS_INO_TO_AGBNO(sc->mp, ino);
742
743 error = xchk_ag_init_existing(sc, agno, &sc->sa);
744 if (!xchk_xref_process_error(sc, agno, agbno, &error))
745 goto out_free;
746
747 xchk_xref_is_used_space(sc, agbno, 1);
748 xchk_inode_xref_finobt(sc, ino);
749 xchk_xref_is_only_owned_by(sc, agbno, 1, &XFS_RMAP_OINFO_INODES);
750 xchk_xref_is_not_shared(sc, agbno, 1);
751 xchk_xref_is_not_cow_staging(sc, agbno, 1);
752 xchk_inode_xref_bmap(sc, dip);
753
754 out_free:
755 xchk_ag_free(sc, &sc->sa);
756 }
757
758 /*
759 * If the reflink iflag disagrees with a scan for shared data fork extents,
760 * either flag an error (shared extents w/ no flag) or a preen (flag set w/o
761 * any shared extents). We already checked for reflink iflag set on a non
762 * reflink filesystem.
763 */
764 static void
xchk_inode_check_reflink_iflag(struct xfs_scrub * sc,xfs_ino_t ino)765 xchk_inode_check_reflink_iflag(
766 struct xfs_scrub *sc,
767 xfs_ino_t ino)
768 {
769 struct xfs_mount *mp = sc->mp;
770 bool has_shared;
771 int error;
772
773 if (!xfs_has_reflink(mp))
774 return;
775
776 error = xfs_reflink_inode_has_shared_extents(sc->tp, sc->ip,
777 &has_shared);
778 if (!xchk_xref_process_error(sc, XFS_INO_TO_AGNO(mp, ino),
779 XFS_INO_TO_AGBNO(mp, ino), &error))
780 return;
781 if (xfs_is_reflink_inode(sc->ip) && !has_shared)
782 xchk_ino_set_preen(sc, ino);
783 else if (!xfs_is_reflink_inode(sc->ip) && has_shared)
784 xchk_ino_set_corrupt(sc, ino);
785 }
786
787 /*
788 * If this inode has zero link count, it must be on the unlinked list. If
789 * it has nonzero link count, it must not be on the unlinked list.
790 */
791 STATIC void
xchk_inode_check_unlinked(struct xfs_scrub * sc)792 xchk_inode_check_unlinked(
793 struct xfs_scrub *sc)
794 {
795 if (VFS_I(sc->ip)->i_nlink == 0) {
796 if (!xfs_inode_on_unlinked_list(sc->ip))
797 xchk_ino_set_corrupt(sc, sc->ip->i_ino);
798 } else {
799 if (xfs_inode_on_unlinked_list(sc->ip))
800 xchk_ino_set_corrupt(sc, sc->ip->i_ino);
801 }
802 }
803
804 /* Scrub an inode. */
805 int
xchk_inode(struct xfs_scrub * sc)806 xchk_inode(
807 struct xfs_scrub *sc)
808 {
809 struct xfs_dinode di;
810 int error = 0;
811
812 /*
813 * If sc->ip is NULL, that means that the setup function called
814 * xfs_iget to look up the inode. xfs_iget returned a EFSCORRUPTED
815 * and a NULL inode, so flag the corruption error and return.
816 */
817 if (!sc->ip) {
818 xchk_ino_set_corrupt(sc, sc->sm->sm_ino);
819 return 0;
820 }
821
822 /* Scrub the inode core. */
823 xfs_inode_to_disk(sc->ip, &di, 0);
824 xchk_dinode(sc, &di, sc->ip->i_ino);
825 if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
826 goto out;
827
828 /*
829 * Look for discrepancies between file's data blocks and the reflink
830 * iflag. We already checked the iflag against the file mode when
831 * we scrubbed the dinode.
832 */
833 if (S_ISREG(VFS_I(sc->ip)->i_mode))
834 xchk_inode_check_reflink_iflag(sc, sc->ip->i_ino);
835
836 xchk_inode_check_unlinked(sc);
837
838 xchk_inode_xref(sc, sc->ip->i_ino, &di);
839 out:
840 return error;
841 }
842