1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2017 Oracle. All Rights Reserved.
4 * Author: Darrick J. Wong <darrick.wong@oracle.com>
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_inode.h"
15 #include "xfs_ialloc.h"
16 #include "xfs_da_format.h"
17 #include "xfs_reflink.h"
19 #include "xfs_bmap_util.h"
20 #include "scrub/scrub.h"
21 #include "scrub/common.h"
22 #include "scrub/btree.h"
25 * Grab total control of the inode metadata. It doesn't matter here if
26 * the file data is still changing; exclusive access to the metadata is
37 * Try to get the inode. If the verifiers fail, we try again
40 error = xchk_get_inode(sc, ip);
46 return xchk_trans_alloc(sc, 0);
51 /* Got the inode, lock it and we're ready to go. */
52 sc->ilock_flags = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
53 xfs_ilock(sc->ip, sc->ilock_flags);
54 error = xchk_trans_alloc(sc, 0);
57 sc->ilock_flags |= XFS_ILOCK_EXCL;
58 xfs_ilock(sc->ip, XFS_ILOCK_EXCL);
61 /* scrub teardown will unlock and release the inode for us */
67 /* Validate di_extsize hint. */
71 struct xfs_dinode *dip,
78 fa = xfs_inode_validate_extsize(sc->mp, be32_to_cpu(dip->di_extsize),
81 xchk_ino_set_corrupt(sc, ino);
85 * Validate di_cowextsize hint.
87 * The rules are documented at xfs_ioctl_setattr_check_cowextsize().
88 * These functions must be kept in sync with each other.
91 xchk_inode_cowextsize(
93 struct xfs_dinode *dip,
101 fa = xfs_inode_validate_cowextsize(sc->mp,
102 be32_to_cpu(dip->di_cowextsize), mode, flags,
105 xchk_ino_set_corrupt(sc, ino);
108 /* Make sure the di_flags make sense for the inode. */
111 struct xfs_scrub *sc,
112 struct xfs_dinode *dip,
117 struct xfs_mount *mp = sc->mp;
119 /* di_flags are all taken, last bit cannot be used */
120 if (flags & ~XFS_DIFLAG_ANY)
123 /* rt flags require rt device */
124 if ((flags & (XFS_DIFLAG_REALTIME | XFS_DIFLAG_RTINHERIT)) &&
128 /* new rt bitmap flag only valid for rbmino */
129 if ((flags & XFS_DIFLAG_NEWRTBM) && ino != mp->m_sb.sb_rbmino)
132 /* directory-only flags */
133 if ((flags & (XFS_DIFLAG_RTINHERIT |
134 XFS_DIFLAG_EXTSZINHERIT |
135 XFS_DIFLAG_PROJINHERIT |
136 XFS_DIFLAG_NOSYMLINKS)) &&
140 /* file-only flags */
141 if ((flags & (XFS_DIFLAG_REALTIME | FS_XFLAG_EXTSIZE)) &&
145 /* filestreams and rt make no sense */
146 if ((flags & XFS_DIFLAG_FILESTREAM) && (flags & XFS_DIFLAG_REALTIME))
151 xchk_ino_set_corrupt(sc, ino);
154 /* Make sure the di_flags2 make sense for the inode. */
157 struct xfs_scrub *sc,
158 struct xfs_dinode *dip,
164 struct xfs_mount *mp = sc->mp;
166 /* Unknown di_flags2 could be from a future kernel */
167 if (flags2 & ~XFS_DIFLAG2_ANY)
168 xchk_ino_set_warning(sc, ino);
170 /* reflink flag requires reflink feature */
171 if ((flags2 & XFS_DIFLAG2_REFLINK) &&
172 !xfs_sb_version_hasreflink(&mp->m_sb))
175 /* cowextsize flag is checked w.r.t. mode separately */
177 /* file/dir-only flags */
178 if ((flags2 & XFS_DIFLAG2_DAX) && !(S_ISREG(mode) || S_ISDIR(mode)))
181 /* file-only flags */
182 if ((flags2 & XFS_DIFLAG2_REFLINK) && !S_ISREG(mode))
185 /* realtime and reflink make no sense, currently */
186 if ((flags & XFS_DIFLAG_REALTIME) && (flags2 & XFS_DIFLAG2_REFLINK))
189 /* dax and reflink make no sense, currently */
190 if ((flags2 & XFS_DIFLAG2_DAX) && (flags2 & XFS_DIFLAG2_REFLINK))
193 /* no bigtime iflag without the bigtime feature */
194 if (xfs_dinode_has_bigtime(dip) &&
195 !xfs_sb_version_hasbigtime(&mp->m_sb))
200 xchk_ino_set_corrupt(sc, ino);
205 struct xfs_scrub *sc,
207 struct xfs_dinode *dip,
208 const xfs_timestamp_t ts)
210 struct timespec64 tv;
212 tv = xfs_inode_from_disk_ts(dip, ts);
213 if (tv.tv_nsec < 0 || tv.tv_nsec >= NSEC_PER_SEC)
214 xchk_ino_set_corrupt(sc, ino);
217 /* Scrub all the ondisk inode fields. */
220 struct xfs_scrub *sc,
221 struct xfs_dinode *dip,
224 struct xfs_mount *mp = sc->mp;
226 unsigned long long isize;
232 flags = be16_to_cpu(dip->di_flags);
233 if (dip->di_version >= 3)
234 flags2 = be64_to_cpu(dip->di_flags2);
239 mode = be16_to_cpu(dip->di_mode);
240 switch (mode & S_IFMT) {
248 /* mode is recognized */
251 xchk_ino_set_corrupt(sc, ino);
256 switch (dip->di_version) {
259 * We autoconvert v1 inodes into v2 inodes on writeout,
260 * so just mark this inode for preening.
262 xchk_ino_set_preen(sc, ino);
266 if (dip->di_onlink != 0)
267 xchk_ino_set_corrupt(sc, ino);
269 if (dip->di_mode == 0 && sc->ip)
270 xchk_ino_set_corrupt(sc, ino);
272 if (dip->di_projid_hi != 0 &&
273 !xfs_sb_version_hasprojid32bit(&mp->m_sb))
274 xchk_ino_set_corrupt(sc, ino);
277 xchk_ino_set_corrupt(sc, ino);
282 * di_uid/di_gid -- -1 isn't invalid, but there's no way that
283 * userspace could have created that.
285 if (dip->di_uid == cpu_to_be32(-1U) ||
286 dip->di_gid == cpu_to_be32(-1U))
287 xchk_ino_set_warning(sc, ino);
290 switch (dip->di_format) {
291 case XFS_DINODE_FMT_DEV:
292 if (!S_ISCHR(mode) && !S_ISBLK(mode) &&
293 !S_ISFIFO(mode) && !S_ISSOCK(mode))
294 xchk_ino_set_corrupt(sc, ino);
296 case XFS_DINODE_FMT_LOCAL:
297 if (!S_ISDIR(mode) && !S_ISLNK(mode))
298 xchk_ino_set_corrupt(sc, ino);
300 case XFS_DINODE_FMT_EXTENTS:
301 if (!S_ISREG(mode) && !S_ISDIR(mode) && !S_ISLNK(mode))
302 xchk_ino_set_corrupt(sc, ino);
304 case XFS_DINODE_FMT_BTREE:
305 if (!S_ISREG(mode) && !S_ISDIR(mode))
306 xchk_ino_set_corrupt(sc, ino);
308 case XFS_DINODE_FMT_UUID:
310 xchk_ino_set_corrupt(sc, ino);
314 /* di_[amc]time.nsec */
315 xchk_dinode_nsec(sc, ino, dip, dip->di_atime);
316 xchk_dinode_nsec(sc, ino, dip, dip->di_mtime);
317 xchk_dinode_nsec(sc, ino, dip, dip->di_ctime);
320 * di_size. xfs_dinode_verify checks for things that screw up
321 * the VFS such as the upper bit being set and zero-length
322 * symlinks/directories, but we can do more here.
324 isize = be64_to_cpu(dip->di_size);
325 if (isize & (1ULL << 63))
326 xchk_ino_set_corrupt(sc, ino);
328 /* Devices, fifos, and sockets must have zero size */
329 if (!S_ISDIR(mode) && !S_ISREG(mode) && !S_ISLNK(mode) && isize != 0)
330 xchk_ino_set_corrupt(sc, ino);
332 /* Directories can't be larger than the data section size (32G) */
333 if (S_ISDIR(mode) && (isize == 0 || isize >= XFS_DIR2_SPACE_SIZE))
334 xchk_ino_set_corrupt(sc, ino);
336 /* Symlinks can't be larger than SYMLINK_MAXLEN */
337 if (S_ISLNK(mode) && (isize == 0 || isize >= XFS_SYMLINK_MAXLEN))
338 xchk_ino_set_corrupt(sc, ino);
341 * Warn if the running kernel can't handle the kinds of offsets
342 * needed to deal with the file size. In other words, if the
343 * pagecache can't cache all the blocks in this file due to
344 * overly large offsets, flag the inode for admin review.
346 if (isize >= mp->m_super->s_maxbytes)
347 xchk_ino_set_warning(sc, ino);
350 if (flags2 & XFS_DIFLAG2_REFLINK) {
351 ; /* nblocks can exceed dblocks */
352 } else if (flags & XFS_DIFLAG_REALTIME) {
354 * nblocks is the sum of data extents (in the rtdev),
355 * attr extents (in the datadev), and both forks' bmbt
356 * blocks (in the datadev). This clumsy check is the
357 * best we can do without cross-referencing with the
360 if (be64_to_cpu(dip->di_nblocks) >=
361 mp->m_sb.sb_dblocks + mp->m_sb.sb_rblocks)
362 xchk_ino_set_corrupt(sc, ino);
364 if (be64_to_cpu(dip->di_nblocks) >= mp->m_sb.sb_dblocks)
365 xchk_ino_set_corrupt(sc, ino);
368 xchk_inode_flags(sc, dip, ino, mode, flags);
370 xchk_inode_extsize(sc, dip, ino, mode, flags);
373 nextents = be32_to_cpu(dip->di_nextents);
374 fork_recs = XFS_DFORK_DSIZE(dip, mp) / sizeof(struct xfs_bmbt_rec);
375 switch (dip->di_format) {
376 case XFS_DINODE_FMT_EXTENTS:
377 if (nextents > fork_recs)
378 xchk_ino_set_corrupt(sc, ino);
380 case XFS_DINODE_FMT_BTREE:
381 if (nextents <= fork_recs)
382 xchk_ino_set_corrupt(sc, ino);
386 xchk_ino_set_corrupt(sc, ino);
391 if (XFS_DFORK_APTR(dip) >= (char *)dip + mp->m_sb.sb_inodesize)
392 xchk_ino_set_corrupt(sc, ino);
393 if (dip->di_anextents != 0 && dip->di_forkoff == 0)
394 xchk_ino_set_corrupt(sc, ino);
395 if (dip->di_forkoff == 0 && dip->di_aformat != XFS_DINODE_FMT_EXTENTS)
396 xchk_ino_set_corrupt(sc, ino);
399 if (dip->di_aformat != XFS_DINODE_FMT_LOCAL &&
400 dip->di_aformat != XFS_DINODE_FMT_EXTENTS &&
401 dip->di_aformat != XFS_DINODE_FMT_BTREE)
402 xchk_ino_set_corrupt(sc, ino);
405 nextents = be16_to_cpu(dip->di_anextents);
406 fork_recs = XFS_DFORK_ASIZE(dip, mp) / sizeof(struct xfs_bmbt_rec);
407 switch (dip->di_aformat) {
408 case XFS_DINODE_FMT_EXTENTS:
409 if (nextents > fork_recs)
410 xchk_ino_set_corrupt(sc, ino);
412 case XFS_DINODE_FMT_BTREE:
413 if (nextents <= fork_recs)
414 xchk_ino_set_corrupt(sc, ino);
418 xchk_ino_set_corrupt(sc, ino);
421 if (dip->di_version >= 3) {
422 xchk_dinode_nsec(sc, ino, dip, dip->di_crtime);
423 xchk_inode_flags2(sc, dip, ino, mode, flags, flags2);
424 xchk_inode_cowextsize(sc, dip, ino, mode, flags,
430 * Make sure the finobt doesn't think this inode is free.
431 * We don't have to check the inobt ourselves because we got the inode via
432 * IGET_UNTRUSTED, which checks the inobt for us.
435 xchk_inode_xref_finobt(
436 struct xfs_scrub *sc,
439 struct xfs_inobt_rec_incore rec;
444 if (!sc->sa.fino_cur || xchk_skip_xref(sc->sm))
447 agino = XFS_INO_TO_AGINO(sc->mp, ino);
450 * Try to get the finobt record. If we can't get it, then we're
453 error = xfs_inobt_lookup(sc->sa.fino_cur, agino, XFS_LOOKUP_LE,
455 if (!xchk_should_check_xref(sc, &error, &sc->sa.fino_cur) ||
459 error = xfs_inobt_get_rec(sc->sa.fino_cur, &rec, &has_record);
460 if (!xchk_should_check_xref(sc, &error, &sc->sa.fino_cur) ||
465 * Otherwise, make sure this record either doesn't cover this inode,
466 * or that it does but it's marked present.
468 if (rec.ir_startino > agino ||
469 rec.ir_startino + XFS_INODES_PER_CHUNK <= agino)
472 if (rec.ir_free & XFS_INOBT_MASK(agino - rec.ir_startino))
473 xchk_btree_xref_set_corrupt(sc, sc->sa.fino_cur, 0);
476 /* Cross reference the inode fields with the forks. */
478 xchk_inode_xref_bmap(
479 struct xfs_scrub *sc,
480 struct xfs_dinode *dip)
482 xfs_extnum_t nextents;
484 xfs_filblks_t acount;
487 if (xchk_skip_xref(sc->sm))
490 /* Walk all the extents to check nextents/naextents/nblocks. */
491 error = xfs_bmap_count_blocks(sc->tp, sc->ip, XFS_DATA_FORK,
493 if (!xchk_should_check_xref(sc, &error, NULL))
495 if (nextents < be32_to_cpu(dip->di_nextents))
496 xchk_ino_xref_set_corrupt(sc, sc->ip->i_ino);
498 error = xfs_bmap_count_blocks(sc->tp, sc->ip, XFS_ATTR_FORK,
500 if (!xchk_should_check_xref(sc, &error, NULL))
502 if (nextents != be16_to_cpu(dip->di_anextents))
503 xchk_ino_xref_set_corrupt(sc, sc->ip->i_ino);
505 /* Check nblocks against the inode. */
506 if (count + acount != be64_to_cpu(dip->di_nblocks))
507 xchk_ino_xref_set_corrupt(sc, sc->ip->i_ino);
510 /* Cross-reference with the other btrees. */
513 struct xfs_scrub *sc,
515 struct xfs_dinode *dip)
521 if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
524 agno = XFS_INO_TO_AGNO(sc->mp, ino);
525 agbno = XFS_INO_TO_AGBNO(sc->mp, ino);
527 error = xchk_ag_init(sc, agno, &sc->sa);
528 if (!xchk_xref_process_error(sc, agno, agbno, &error))
531 xchk_xref_is_used_space(sc, agbno, 1);
532 xchk_inode_xref_finobt(sc, ino);
533 xchk_xref_is_owned_by(sc, agbno, 1, &XFS_RMAP_OINFO_INODES);
534 xchk_xref_is_not_shared(sc, agbno, 1);
535 xchk_inode_xref_bmap(sc, dip);
537 xchk_ag_free(sc, &sc->sa);
541 * If the reflink iflag disagrees with a scan for shared data fork extents,
542 * either flag an error (shared extents w/ no flag) or a preen (flag set w/o
543 * any shared extents). We already checked for reflink iflag set on a non
544 * reflink filesystem.
547 xchk_inode_check_reflink_iflag(
548 struct xfs_scrub *sc,
551 struct xfs_mount *mp = sc->mp;
555 if (!xfs_sb_version_hasreflink(&mp->m_sb))
558 error = xfs_reflink_inode_has_shared_extents(sc->tp, sc->ip,
560 if (!xchk_xref_process_error(sc, XFS_INO_TO_AGNO(mp, ino),
561 XFS_INO_TO_AGBNO(mp, ino), &error))
563 if (xfs_is_reflink_inode(sc->ip) && !has_shared)
564 xchk_ino_set_preen(sc, ino);
565 else if (!xfs_is_reflink_inode(sc->ip) && has_shared)
566 xchk_ino_set_corrupt(sc, ino);
569 /* Scrub an inode. */
572 struct xfs_scrub *sc)
574 struct xfs_dinode di;
578 * If sc->ip is NULL, that means that the setup function called
579 * xfs_iget to look up the inode. xfs_iget returned a EFSCORRUPTED
580 * and a NULL inode, so flag the corruption error and return.
583 xchk_ino_set_corrupt(sc, sc->sm->sm_ino);
587 /* Scrub the inode core. */
588 xfs_inode_to_disk(sc->ip, &di, 0);
589 xchk_dinode(sc, &di, sc->ip->i_ino);
590 if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
594 * Look for discrepancies between file's data blocks and the reflink
595 * iflag. We already checked the iflag against the file mode when
596 * we scrubbed the dinode.
598 if (S_ISREG(VFS_I(sc->ip)->i_mode))
599 xchk_inode_check_reflink_iflag(sc, sc->ip->i_ino);
601 xchk_inode_xref(sc, sc->ip->i_ino, &di);