1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6 #include "xfs.h"
7 #include "xfs_fs.h"
8 #include "xfs_shared.h"
9 #include "xfs_format.h"
10 #include "xfs_log_format.h"
11 #include "xfs_trans_resv.h"
12 #include "xfs_mount.h"
13 #include "xfs_ag.h"
14 #include "xfs_inode.h"
15 #include "xfs_errortag.h"
16 #include "xfs_error.h"
17 #include "xfs_icache.h"
18 #include "xfs_trans.h"
19 #include "xfs_ialloc.h"
20 #include "xfs_dir2.h"
21 #include "xfs_health.h"
22 #include "xfs_metafile.h"
23
24 #include <linux/iversion.h>
25
26 /*
27 * If we are doing readahead on an inode buffer, we might be in log recovery
28 * reading an inode allocation buffer that hasn't yet been replayed, and hence
29 * has not had the inode cores stamped into it. Hence for readahead, the buffer
30 * may be potentially invalid.
31 *
32 * If the readahead buffer is invalid, we need to mark it with an error and
33 * clear the DONE status of the buffer so that a followup read will re-read it
34 * from disk. We don't report the error otherwise to avoid warnings during log
35 * recovery and we don't get unnecessary panics on debug kernels. We use EIO here
36 * because all we want to do is say readahead failed; there is no-one to report
37 * the error to, so this will distinguish it from a non-ra verifier failure.
38 * Changes to this readahead error behaviour also need to be reflected in
39 * xfs_dquot_buf_readahead_verify().
40 */
41 static void
xfs_inode_buf_verify(struct xfs_buf * bp,bool readahead)42 xfs_inode_buf_verify(
43 struct xfs_buf *bp,
44 bool readahead)
45 {
46 struct xfs_mount *mp = bp->b_mount;
47 int i;
48 int ni;
49
50 /*
51 * Validate the magic number and version of every inode in the buffer
52 */
53 ni = XFS_BB_TO_FSB(mp, bp->b_length) * mp->m_sb.sb_inopblock;
54 for (i = 0; i < ni; i++) {
55 struct xfs_dinode *dip;
56 xfs_agino_t unlinked_ino;
57 int di_ok;
58
59 dip = xfs_buf_offset(bp, (i << mp->m_sb.sb_inodelog));
60 unlinked_ino = be32_to_cpu(dip->di_next_unlinked);
61 di_ok = xfs_verify_magic16(bp, dip->di_magic) &&
62 xfs_dinode_good_version(mp, dip->di_version) &&
63 xfs_verify_agino_or_null(bp->b_pag, unlinked_ino);
64 if (unlikely(XFS_TEST_ERROR(!di_ok, mp,
65 XFS_ERRTAG_ITOBP_INOTOBP))) {
66 if (readahead) {
67 bp->b_flags &= ~XBF_DONE;
68 xfs_buf_ioerror(bp, -EIO);
69 return;
70 }
71
72 #ifdef DEBUG
73 xfs_alert(mp,
74 "bad inode magic/vsn daddr %lld #%d (magic=%x)",
75 (unsigned long long)xfs_buf_daddr(bp), i,
76 be16_to_cpu(dip->di_magic));
77 #endif
78 xfs_buf_verifier_error(bp, -EFSCORRUPTED,
79 __func__, dip, sizeof(*dip),
80 NULL);
81 return;
82 }
83 }
84 }
85
86
87 static void
xfs_inode_buf_read_verify(struct xfs_buf * bp)88 xfs_inode_buf_read_verify(
89 struct xfs_buf *bp)
90 {
91 xfs_inode_buf_verify(bp, false);
92 }
93
94 static void
xfs_inode_buf_readahead_verify(struct xfs_buf * bp)95 xfs_inode_buf_readahead_verify(
96 struct xfs_buf *bp)
97 {
98 xfs_inode_buf_verify(bp, true);
99 }
100
101 static void
xfs_inode_buf_write_verify(struct xfs_buf * bp)102 xfs_inode_buf_write_verify(
103 struct xfs_buf *bp)
104 {
105 xfs_inode_buf_verify(bp, false);
106 }
107
108 const struct xfs_buf_ops xfs_inode_buf_ops = {
109 .name = "xfs_inode",
110 .magic16 = { cpu_to_be16(XFS_DINODE_MAGIC),
111 cpu_to_be16(XFS_DINODE_MAGIC) },
112 .verify_read = xfs_inode_buf_read_verify,
113 .verify_write = xfs_inode_buf_write_verify,
114 };
115
116 const struct xfs_buf_ops xfs_inode_buf_ra_ops = {
117 .name = "xfs_inode_ra",
118 .magic16 = { cpu_to_be16(XFS_DINODE_MAGIC),
119 cpu_to_be16(XFS_DINODE_MAGIC) },
120 .verify_read = xfs_inode_buf_readahead_verify,
121 .verify_write = xfs_inode_buf_write_verify,
122 };
123
124
125 /*
126 * This routine is called to map an inode to the buffer containing the on-disk
127 * version of the inode. It returns a pointer to the buffer containing the
128 * on-disk inode in the bpp parameter.
129 */
130 int
xfs_imap_to_bp(struct xfs_mount * mp,struct xfs_trans * tp,struct xfs_imap * imap,struct xfs_buf ** bpp)131 xfs_imap_to_bp(
132 struct xfs_mount *mp,
133 struct xfs_trans *tp,
134 struct xfs_imap *imap,
135 struct xfs_buf **bpp)
136 {
137 int error;
138
139 error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, imap->im_blkno,
140 imap->im_len, 0, bpp, &xfs_inode_buf_ops);
141 if (xfs_metadata_is_sick(error))
142 xfs_agno_mark_sick(mp, xfs_daddr_to_agno(mp, imap->im_blkno),
143 XFS_SICK_AG_INODES);
144 return error;
145 }
146
xfs_inode_decode_bigtime(uint64_t ts)147 static inline struct timespec64 xfs_inode_decode_bigtime(uint64_t ts)
148 {
149 struct timespec64 tv;
150 uint32_t n;
151
152 tv.tv_sec = xfs_bigtime_to_unix(div_u64_rem(ts, NSEC_PER_SEC, &n));
153 tv.tv_nsec = n;
154
155 return tv;
156 }
157
158 /* Convert an ondisk timestamp to an incore timestamp. */
159 struct timespec64
xfs_inode_from_disk_ts(struct xfs_dinode * dip,const xfs_timestamp_t ts)160 xfs_inode_from_disk_ts(
161 struct xfs_dinode *dip,
162 const xfs_timestamp_t ts)
163 {
164 struct timespec64 tv;
165 struct xfs_legacy_timestamp *lts;
166
167 if (xfs_dinode_has_bigtime(dip))
168 return xfs_inode_decode_bigtime(be64_to_cpu(ts));
169
170 lts = (struct xfs_legacy_timestamp *)&ts;
171 tv.tv_sec = (int)be32_to_cpu(lts->t_sec);
172 tv.tv_nsec = (int)be32_to_cpu(lts->t_nsec);
173
174 return tv;
175 }
176
177 int
xfs_inode_from_disk(struct xfs_inode * ip,struct xfs_dinode * from)178 xfs_inode_from_disk(
179 struct xfs_inode *ip,
180 struct xfs_dinode *from)
181 {
182 struct inode *inode = VFS_I(ip);
183 int error;
184 xfs_failaddr_t fa;
185
186 ASSERT(ip->i_cowfp == NULL);
187
188 fa = xfs_dinode_verify(ip->i_mount, ip->i_ino, from);
189 if (fa) {
190 xfs_inode_verifier_error(ip, -EFSCORRUPTED, "dinode", from,
191 sizeof(*from), fa);
192 return -EFSCORRUPTED;
193 }
194
195 /*
196 * First get the permanent information that is needed to allocate an
197 * inode. If the inode is unused, mode is zero and we shouldn't mess
198 * with the uninitialized part of it.
199 */
200 if (!xfs_has_v3inodes(ip->i_mount))
201 ip->i_flushiter = be16_to_cpu(from->di_flushiter);
202 inode->i_generation = be32_to_cpu(from->di_gen);
203 inode->i_mode = be16_to_cpu(from->di_mode);
204 if (!inode->i_mode)
205 return 0;
206
207 /*
208 * Convert v1 inodes immediately to v2 inode format as this is the
209 * minimum inode version format we support in the rest of the code.
210 * They will also be unconditionally written back to disk as v2 inodes.
211 */
212 if (unlikely(from->di_version == 1)) {
213 /* di_metatype used to be di_onlink */
214 set_nlink(inode, be16_to_cpu(from->di_metatype));
215 ip->i_projid = 0;
216 } else {
217 set_nlink(inode, be32_to_cpu(from->di_nlink));
218 ip->i_projid = (prid_t)be16_to_cpu(from->di_projid_hi) << 16 |
219 be16_to_cpu(from->di_projid_lo);
220 if (xfs_dinode_is_metadir(from))
221 ip->i_metatype = be16_to_cpu(from->di_metatype);
222 }
223
224 i_uid_write(inode, be32_to_cpu(from->di_uid));
225 i_gid_write(inode, be32_to_cpu(from->di_gid));
226
227 /*
228 * Time is signed, so need to convert to signed 32 bit before
229 * storing in inode timestamp which may be 64 bit. Otherwise
230 * a time before epoch is converted to a time long after epoch
231 * on 64 bit systems.
232 */
233 inode_set_atime_to_ts(inode,
234 xfs_inode_from_disk_ts(from, from->di_atime));
235 inode_set_mtime_to_ts(inode,
236 xfs_inode_from_disk_ts(from, from->di_mtime));
237 inode_set_ctime_to_ts(inode,
238 xfs_inode_from_disk_ts(from, from->di_ctime));
239
240 ip->i_disk_size = be64_to_cpu(from->di_size);
241 ip->i_nblocks = be64_to_cpu(from->di_nblocks);
242 ip->i_extsize = be32_to_cpu(from->di_extsize);
243 ip->i_forkoff = from->di_forkoff;
244 ip->i_diflags = be16_to_cpu(from->di_flags);
245 ip->i_next_unlinked = be32_to_cpu(from->di_next_unlinked);
246
247 if (from->di_dmevmask || from->di_dmstate)
248 xfs_iflags_set(ip, XFS_IPRESERVE_DM_FIELDS);
249
250 if (xfs_has_v3inodes(ip->i_mount)) {
251 inode_set_iversion_queried(inode,
252 be64_to_cpu(from->di_changecount));
253 ip->i_crtime = xfs_inode_from_disk_ts(from, from->di_crtime);
254 ip->i_diflags2 = be64_to_cpu(from->di_flags2);
255 /* also covers the di_used_blocks union arm: */
256 ip->i_cowextsize = be32_to_cpu(from->di_cowextsize);
257 BUILD_BUG_ON(sizeof(from->di_cowextsize) !=
258 sizeof(from->di_used_blocks));
259 }
260
261 error = xfs_iformat_data_fork(ip, from);
262 if (error)
263 return error;
264 if (from->di_forkoff) {
265 error = xfs_iformat_attr_fork(ip, from);
266 if (error)
267 goto out_destroy_data_fork;
268 }
269 if (xfs_is_reflink_inode(ip))
270 xfs_ifork_init_cow(ip);
271 return 0;
272
273 out_destroy_data_fork:
274 xfs_idestroy_fork(&ip->i_df);
275 return error;
276 }
277
278 /* Convert an incore timestamp to an ondisk timestamp. */
279 static inline xfs_timestamp_t
xfs_inode_to_disk_ts(struct xfs_inode * ip,const struct timespec64 tv)280 xfs_inode_to_disk_ts(
281 struct xfs_inode *ip,
282 const struct timespec64 tv)
283 {
284 struct xfs_legacy_timestamp *lts;
285 xfs_timestamp_t ts;
286
287 if (xfs_inode_has_bigtime(ip))
288 return cpu_to_be64(xfs_inode_encode_bigtime(tv));
289
290 lts = (struct xfs_legacy_timestamp *)&ts;
291 lts->t_sec = cpu_to_be32(tv.tv_sec);
292 lts->t_nsec = cpu_to_be32(tv.tv_nsec);
293
294 return ts;
295 }
296
297 static inline void
xfs_inode_to_disk_iext_counters(struct xfs_inode * ip,struct xfs_dinode * to)298 xfs_inode_to_disk_iext_counters(
299 struct xfs_inode *ip,
300 struct xfs_dinode *to)
301 {
302 if (xfs_inode_has_large_extent_counts(ip)) {
303 to->di_big_nextents = cpu_to_be64(xfs_ifork_nextents(&ip->i_df));
304 to->di_big_anextents = cpu_to_be32(xfs_ifork_nextents(&ip->i_af));
305 /*
306 * We might be upgrading the inode to use larger extent counters
307 * than was previously used. Hence zero the unused field.
308 */
309 to->di_nrext64_pad = cpu_to_be16(0);
310 } else {
311 to->di_nextents = cpu_to_be32(xfs_ifork_nextents(&ip->i_df));
312 to->di_anextents = cpu_to_be16(xfs_ifork_nextents(&ip->i_af));
313 }
314 }
315
316 void
xfs_inode_to_disk(struct xfs_inode * ip,struct xfs_dinode * to,xfs_lsn_t lsn)317 xfs_inode_to_disk(
318 struct xfs_inode *ip,
319 struct xfs_dinode *to,
320 xfs_lsn_t lsn)
321 {
322 struct inode *inode = VFS_I(ip);
323
324 to->di_magic = cpu_to_be16(XFS_DINODE_MAGIC);
325 if (xfs_is_metadir_inode(ip))
326 to->di_metatype = cpu_to_be16(ip->i_metatype);
327 else
328 to->di_metatype = 0;
329
330 to->di_format = xfs_ifork_format(&ip->i_df);
331 to->di_uid = cpu_to_be32(i_uid_read(inode));
332 to->di_gid = cpu_to_be32(i_gid_read(inode));
333 to->di_projid_lo = cpu_to_be16(ip->i_projid & 0xffff);
334 to->di_projid_hi = cpu_to_be16(ip->i_projid >> 16);
335
336 to->di_atime = xfs_inode_to_disk_ts(ip, inode_get_atime(inode));
337 to->di_mtime = xfs_inode_to_disk_ts(ip, inode_get_mtime(inode));
338 to->di_ctime = xfs_inode_to_disk_ts(ip, inode_get_ctime(inode));
339 to->di_nlink = cpu_to_be32(inode->i_nlink);
340 to->di_gen = cpu_to_be32(inode->i_generation);
341 to->di_mode = cpu_to_be16(inode->i_mode);
342
343 to->di_size = cpu_to_be64(ip->i_disk_size);
344 to->di_nblocks = cpu_to_be64(ip->i_nblocks);
345 to->di_extsize = cpu_to_be32(ip->i_extsize);
346 to->di_forkoff = ip->i_forkoff;
347 to->di_aformat = xfs_ifork_format(&ip->i_af);
348 to->di_flags = cpu_to_be16(ip->i_diflags);
349
350 if (xfs_has_v3inodes(ip->i_mount)) {
351 to->di_version = 3;
352 to->di_changecount = cpu_to_be64(inode_peek_iversion(inode));
353 to->di_crtime = xfs_inode_to_disk_ts(ip, ip->i_crtime);
354 to->di_flags2 = cpu_to_be64(ip->i_diflags2);
355 /* also covers the di_used_blocks union arm: */
356 to->di_cowextsize = cpu_to_be32(ip->i_cowextsize);
357 to->di_ino = cpu_to_be64(ip->i_ino);
358 to->di_lsn = cpu_to_be64(lsn);
359 memset(to->di_pad2, 0, sizeof(to->di_pad2));
360 uuid_copy(&to->di_uuid, &ip->i_mount->m_sb.sb_meta_uuid);
361 to->di_v3_pad = 0;
362 } else {
363 to->di_version = 2;
364 to->di_flushiter = cpu_to_be16(ip->i_flushiter);
365 memset(to->di_v2_pad, 0, sizeof(to->di_v2_pad));
366 }
367
368 xfs_inode_to_disk_iext_counters(ip, to);
369 }
370
371 static xfs_failaddr_t
xfs_dinode_verify_fork(struct xfs_dinode * dip,struct xfs_mount * mp,int whichfork)372 xfs_dinode_verify_fork(
373 struct xfs_dinode *dip,
374 struct xfs_mount *mp,
375 int whichfork)
376 {
377 xfs_extnum_t di_nextents;
378 xfs_extnum_t max_extents;
379 mode_t mode = be16_to_cpu(dip->di_mode);
380 uint32_t fork_size = XFS_DFORK_SIZE(dip, mp, whichfork);
381 uint32_t fork_format = XFS_DFORK_FORMAT(dip, whichfork);
382
383 di_nextents = xfs_dfork_nextents(dip, whichfork);
384
385 /*
386 * For fork types that can contain local data, check that the fork
387 * format matches the size of local data contained within the fork.
388 */
389 if (whichfork == XFS_DATA_FORK) {
390 /*
391 * A directory small enough to fit in the inode must be stored
392 * in local format. The directory sf <-> extents conversion
393 * code updates the directory size accordingly. Directories
394 * being truncated have zero size and are not subject to this
395 * check.
396 */
397 if (S_ISDIR(mode)) {
398 if (dip->di_size &&
399 be64_to_cpu(dip->di_size) <= fork_size &&
400 fork_format != XFS_DINODE_FMT_LOCAL)
401 return __this_address;
402 }
403
404 /*
405 * A symlink with a target small enough to fit in the inode can
406 * be stored in extents format if xattrs were added (thus
407 * converting the data fork from shortform to remote format)
408 * and then removed.
409 */
410 if (S_ISLNK(mode)) {
411 if (be64_to_cpu(dip->di_size) <= fork_size &&
412 fork_format != XFS_DINODE_FMT_EXTENTS &&
413 fork_format != XFS_DINODE_FMT_LOCAL)
414 return __this_address;
415 }
416
417 /*
418 * For all types, check that when the size says the fork should
419 * be in extent or btree format, the inode isn't claiming to be
420 * in local format.
421 */
422 if (be64_to_cpu(dip->di_size) > fork_size &&
423 fork_format == XFS_DINODE_FMT_LOCAL)
424 return __this_address;
425 }
426
427 switch (fork_format) {
428 case XFS_DINODE_FMT_LOCAL:
429 /*
430 * No local regular files yet.
431 */
432 if (S_ISREG(mode) && whichfork == XFS_DATA_FORK)
433 return __this_address;
434 if (di_nextents)
435 return __this_address;
436 break;
437 case XFS_DINODE_FMT_EXTENTS:
438 if (di_nextents > XFS_DFORK_MAXEXT(dip, mp, whichfork))
439 return __this_address;
440 break;
441 case XFS_DINODE_FMT_BTREE:
442 max_extents = xfs_iext_max_nextents(
443 xfs_dinode_has_large_extent_counts(dip),
444 whichfork);
445 if (di_nextents > max_extents)
446 return __this_address;
447 break;
448 case XFS_DINODE_FMT_META_BTREE:
449 if (!xfs_has_metadir(mp))
450 return __this_address;
451 if (!(dip->di_flags2 & cpu_to_be64(XFS_DIFLAG2_METADATA)))
452 return __this_address;
453 switch (be16_to_cpu(dip->di_metatype)) {
454 case XFS_METAFILE_RTRMAP:
455 /*
456 * growfs must create the rtrmap inodes before adding a
457 * realtime volume to the filesystem, so we cannot use
458 * the rtrmapbt predicate here.
459 */
460 if (!xfs_has_rmapbt(mp))
461 return __this_address;
462 break;
463 case XFS_METAFILE_RTREFCOUNT:
464 /* same comment about growfs and rmap inodes applies */
465 if (!xfs_has_reflink(mp))
466 return __this_address;
467 break;
468 default:
469 return __this_address;
470 }
471 break;
472 default:
473 return __this_address;
474 }
475 return NULL;
476 }
477
478 static xfs_failaddr_t
xfs_dinode_verify_forkoff(struct xfs_dinode * dip,struct xfs_mount * mp)479 xfs_dinode_verify_forkoff(
480 struct xfs_dinode *dip,
481 struct xfs_mount *mp)
482 {
483 if (!dip->di_forkoff)
484 return NULL;
485
486 switch (dip->di_format) {
487 case XFS_DINODE_FMT_DEV:
488 if (dip->di_forkoff != (roundup(sizeof(xfs_dev_t), 8) >> 3))
489 return __this_address;
490 break;
491 case XFS_DINODE_FMT_META_BTREE:
492 if (!xfs_has_metadir(mp) || !xfs_has_parent(mp))
493 return __this_address;
494 fallthrough;
495 case XFS_DINODE_FMT_LOCAL: /* fall through ... */
496 case XFS_DINODE_FMT_EXTENTS: /* fall through ... */
497 case XFS_DINODE_FMT_BTREE:
498 if (dip->di_forkoff >= (XFS_LITINO(mp) >> 3))
499 return __this_address;
500 break;
501 default:
502 return __this_address;
503 }
504 return NULL;
505 }
506
507 static xfs_failaddr_t
xfs_dinode_verify_nrext64(struct xfs_mount * mp,struct xfs_dinode * dip)508 xfs_dinode_verify_nrext64(
509 struct xfs_mount *mp,
510 struct xfs_dinode *dip)
511 {
512 if (xfs_dinode_has_large_extent_counts(dip)) {
513 if (!xfs_has_large_extent_counts(mp))
514 return __this_address;
515 if (dip->di_nrext64_pad != 0)
516 return __this_address;
517 } else if (dip->di_version >= 3) {
518 if (dip->di_v3_pad != 0)
519 return __this_address;
520 }
521
522 return NULL;
523 }
524
525 /*
526 * Validate all the picky requirements we have for a file that claims to be
527 * filesystem metadata.
528 */
529 xfs_failaddr_t
xfs_dinode_verify_metadir(struct xfs_mount * mp,struct xfs_dinode * dip,uint16_t mode,uint16_t flags,uint64_t flags2)530 xfs_dinode_verify_metadir(
531 struct xfs_mount *mp,
532 struct xfs_dinode *dip,
533 uint16_t mode,
534 uint16_t flags,
535 uint64_t flags2)
536 {
537 if (!xfs_has_metadir(mp))
538 return __this_address;
539
540 /* V5 filesystem only */
541 if (dip->di_version < 3)
542 return __this_address;
543
544 if (be16_to_cpu(dip->di_metatype) >= XFS_METAFILE_MAX)
545 return __this_address;
546
547 /* V3 inode fields that are always zero */
548 if ((flags2 & XFS_DIFLAG2_NREXT64) && dip->di_nrext64_pad)
549 return __this_address;
550 if (!(flags2 & XFS_DIFLAG2_NREXT64) && dip->di_flushiter)
551 return __this_address;
552
553 /* Metadata files can only be directories or regular files */
554 if (!S_ISDIR(mode) && !S_ISREG(mode))
555 return __this_address;
556
557 /* They must have zero access permissions */
558 if (mode & 0777)
559 return __this_address;
560
561 /* DMAPI event and state masks are zero */
562 if (dip->di_dmevmask || dip->di_dmstate)
563 return __this_address;
564
565 /*
566 * User and group IDs must be zero. The project ID is used for
567 * grouping inodes. Metadata inodes are never accounted to quotas.
568 */
569 if (dip->di_uid || dip->di_gid)
570 return __this_address;
571
572 /* Mandatory inode flags must be set */
573 if (S_ISDIR(mode)) {
574 if ((flags & XFS_METADIR_DIFLAGS) != XFS_METADIR_DIFLAGS)
575 return __this_address;
576 } else {
577 if ((flags & XFS_METAFILE_DIFLAGS) != XFS_METAFILE_DIFLAGS)
578 return __this_address;
579 }
580
581 /* dax flags2 must not be set */
582 if (flags2 & XFS_DIFLAG2_DAX)
583 return __this_address;
584
585 return NULL;
586 }
587
588 xfs_failaddr_t
xfs_dinode_verify(struct xfs_mount * mp,xfs_ino_t ino,struct xfs_dinode * dip)589 xfs_dinode_verify(
590 struct xfs_mount *mp,
591 xfs_ino_t ino,
592 struct xfs_dinode *dip)
593 {
594 xfs_failaddr_t fa;
595 uint16_t mode;
596 uint16_t flags;
597 uint64_t flags2;
598 uint64_t di_size;
599 xfs_extnum_t nextents;
600 xfs_extnum_t naextents;
601 xfs_filblks_t nblocks;
602
603 if (dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC))
604 return __this_address;
605
606 /* Verify v3 integrity information first */
607 if (dip->di_version >= 3) {
608 if (!xfs_has_v3inodes(mp))
609 return __this_address;
610 if (!xfs_verify_cksum((char *)dip, mp->m_sb.sb_inodesize,
611 XFS_DINODE_CRC_OFF))
612 return __this_address;
613 if (be64_to_cpu(dip->di_ino) != ino)
614 return __this_address;
615 if (!uuid_equal(&dip->di_uuid, &mp->m_sb.sb_meta_uuid))
616 return __this_address;
617 }
618
619 /*
620 * Historical note: xfsprogs in the 3.2 era set up its incore inodes to
621 * have di_nlink track the link count, even if the actual filesystem
622 * only supported V1 inodes (i.e. di_onlink). When writing out the
623 * ondisk inode, it would set both the ondisk di_nlink and di_onlink to
624 * the the incore di_nlink value, which is why we cannot check for
625 * di_nlink==0 on a V1 inode. V2/3 inodes would get written out with
626 * di_onlink==0, so we can check that.
627 */
628 if (dip->di_version == 2) {
629 if (dip->di_metatype)
630 return __this_address;
631 } else if (dip->di_version >= 3) {
632 if (!xfs_dinode_is_metadir(dip) && dip->di_metatype)
633 return __this_address;
634 }
635
636 /* don't allow invalid i_size */
637 di_size = be64_to_cpu(dip->di_size);
638 if (di_size & (1ULL << 63))
639 return __this_address;
640
641 mode = be16_to_cpu(dip->di_mode);
642 if (mode && xfs_mode_to_ftype(mode) == XFS_DIR3_FT_UNKNOWN)
643 return __this_address;
644
645 /*
646 * No zero-length symlinks/dirs unless they're unlinked and hence being
647 * inactivated.
648 */
649 if ((S_ISLNK(mode) || S_ISDIR(mode)) && di_size == 0) {
650 if (dip->di_version > 1) {
651 if (dip->di_nlink)
652 return __this_address;
653 } else {
654 /* di_metatype used to be di_onlink */
655 if (dip->di_metatype)
656 return __this_address;
657 }
658 }
659
660 fa = xfs_dinode_verify_nrext64(mp, dip);
661 if (fa)
662 return fa;
663
664 nextents = xfs_dfork_data_extents(dip);
665 naextents = xfs_dfork_attr_extents(dip);
666 nblocks = be64_to_cpu(dip->di_nblocks);
667
668 /* Fork checks carried over from xfs_iformat_fork */
669 if (mode && nextents + naextents > nblocks)
670 return __this_address;
671
672 if (S_ISDIR(mode) && nextents > mp->m_dir_geo->max_extents)
673 return __this_address;
674
675 if (mode && XFS_DFORK_BOFF(dip) > mp->m_sb.sb_inodesize)
676 return __this_address;
677
678 flags = be16_to_cpu(dip->di_flags);
679
680 if (mode && (flags & XFS_DIFLAG_REALTIME) && !mp->m_rtdev_targp)
681 return __this_address;
682
683 /* check for illegal values of forkoff */
684 fa = xfs_dinode_verify_forkoff(dip, mp);
685 if (fa)
686 return fa;
687
688 /* Do we have appropriate data fork formats for the mode? */
689 switch (mode & S_IFMT) {
690 case S_IFIFO:
691 case S_IFCHR:
692 case S_IFBLK:
693 case S_IFSOCK:
694 if (dip->di_format != XFS_DINODE_FMT_DEV)
695 return __this_address;
696 break;
697 case S_IFREG:
698 case S_IFLNK:
699 case S_IFDIR:
700 fa = xfs_dinode_verify_fork(dip, mp, XFS_DATA_FORK);
701 if (fa)
702 return fa;
703 break;
704 case 0:
705 /* Uninitialized inode ok. */
706 break;
707 default:
708 return __this_address;
709 }
710
711 if (dip->di_forkoff) {
712 fa = xfs_dinode_verify_fork(dip, mp, XFS_ATTR_FORK);
713 if (fa)
714 return fa;
715 } else {
716 /*
717 * If there is no fork offset, this may be a freshly-made inode
718 * in a new disk cluster, in which case di_aformat is zeroed.
719 * Otherwise, such an inode must be in EXTENTS format; this goes
720 * for freed inodes as well.
721 */
722 switch (dip->di_aformat) {
723 case 0:
724 case XFS_DINODE_FMT_EXTENTS:
725 break;
726 default:
727 return __this_address;
728 }
729 if (naextents)
730 return __this_address;
731 }
732
733 /* extent size hint validation */
734 fa = xfs_inode_validate_extsize(mp, be32_to_cpu(dip->di_extsize),
735 mode, flags);
736 if (fa)
737 return fa;
738
739 /* only version 3 or greater inodes are extensively verified here */
740 if (dip->di_version < 3)
741 return NULL;
742
743 flags2 = be64_to_cpu(dip->di_flags2);
744
745 /* don't allow reflink/cowextsize if we don't have reflink */
746 if ((flags2 & (XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE)) &&
747 !xfs_has_reflink(mp))
748 return __this_address;
749
750 /* only regular files get reflink */
751 if ((flags2 & XFS_DIFLAG2_REFLINK) && (mode & S_IFMT) != S_IFREG)
752 return __this_address;
753
754 /* don't let reflink and realtime mix */
755 if ((flags2 & XFS_DIFLAG2_REFLINK) && (flags & XFS_DIFLAG_REALTIME) &&
756 !xfs_has_rtreflink(mp))
757 return __this_address;
758
759 if (xfs_has_zoned(mp) &&
760 dip->di_metatype == cpu_to_be16(XFS_METAFILE_RTRMAP)) {
761 if (be32_to_cpu(dip->di_used_blocks) > mp->m_sb.sb_rgextents)
762 return __this_address;
763 } else {
764 /* COW extent size hint validation */
765 fa = xfs_inode_validate_cowextsize(mp,
766 be32_to_cpu(dip->di_cowextsize),
767 mode, flags, flags2);
768 if (fa)
769 return fa;
770 }
771
772 /* bigtime iflag can only happen on bigtime filesystems */
773 if (xfs_dinode_has_bigtime(dip) &&
774 !xfs_has_bigtime(mp))
775 return __this_address;
776
777 if (flags2 & XFS_DIFLAG2_METADATA) {
778 fa = xfs_dinode_verify_metadir(mp, dip, mode, flags, flags2);
779 if (fa)
780 return fa;
781 }
782
783 /* metadata inodes containing btrees always have zero extent count */
784 if (XFS_DFORK_FORMAT(dip, XFS_DATA_FORK) != XFS_DINODE_FMT_META_BTREE) {
785 if (nextents + naextents == 0 && nblocks != 0)
786 return __this_address;
787 }
788
789 return NULL;
790 }
791
792 void
xfs_dinode_calc_crc(struct xfs_mount * mp,struct xfs_dinode * dip)793 xfs_dinode_calc_crc(
794 struct xfs_mount *mp,
795 struct xfs_dinode *dip)
796 {
797 uint32_t crc;
798
799 if (dip->di_version < 3)
800 return;
801
802 ASSERT(xfs_has_crc(mp));
803 crc = xfs_start_cksum_update((char *)dip, mp->m_sb.sb_inodesize,
804 XFS_DINODE_CRC_OFF);
805 dip->di_crc = xfs_end_cksum(crc);
806 }
807
808 /*
809 * Validate di_extsize hint.
810 *
811 * 1. Extent size hint is only valid for directories and regular files.
812 * 2. FS_XFLAG_EXTSIZE is only valid for regular files.
813 * 3. FS_XFLAG_EXTSZINHERIT is only valid for directories.
814 * 4. Hint cannot be larger than MAXTEXTLEN.
815 * 5. Can be changed on directories at any time.
816 * 6. Hint value of 0 turns off hints, clears inode flags.
817 * 7. Extent size must be a multiple of the appropriate block size.
818 * For realtime files, this is the rt extent size.
819 * 8. For non-realtime files, the extent size hint must be limited
820 * to half the AG size to avoid alignment extending the extent beyond the
821 * limits of the AG.
822 */
823 xfs_failaddr_t
xfs_inode_validate_extsize(struct xfs_mount * mp,uint32_t extsize,uint16_t mode,uint16_t flags)824 xfs_inode_validate_extsize(
825 struct xfs_mount *mp,
826 uint32_t extsize,
827 uint16_t mode,
828 uint16_t flags)
829 {
830 bool rt_flag;
831 bool hint_flag;
832 bool inherit_flag;
833 uint32_t extsize_bytes;
834 uint32_t blocksize_bytes;
835
836 rt_flag = (flags & XFS_DIFLAG_REALTIME);
837 hint_flag = (flags & XFS_DIFLAG_EXTSIZE);
838 inherit_flag = (flags & XFS_DIFLAG_EXTSZINHERIT);
839 extsize_bytes = XFS_FSB_TO_B(mp, extsize);
840
841 /*
842 * This comment describes a historic gap in this verifier function.
843 *
844 * For a directory with both RTINHERIT and EXTSZINHERIT flags set, this
845 * function has never checked that the extent size hint is an integer
846 * multiple of the realtime extent size. Since we allow users to set
847 * this combination on non-rt filesystems /and/ to change the rt
848 * extent size when adding a rt device to a filesystem, the net effect
849 * is that users can configure a filesystem anticipating one rt
850 * geometry and change their minds later. Directories do not use the
851 * extent size hint, so this is harmless for them.
852 *
853 * If a directory with a misaligned extent size hint is allowed to
854 * propagate that hint into a new regular realtime file, the result
855 * is that the inode cluster buffer verifier will trigger a corruption
856 * shutdown the next time it is run, because the verifier has always
857 * enforced the alignment rule for regular files.
858 *
859 * Because we allow administrators to set a new rt extent size when
860 * adding a rt section, we cannot add a check to this verifier because
861 * that will result a new source of directory corruption errors when
862 * reading an existing filesystem. Instead, we rely on callers to
863 * decide when alignment checks are appropriate, and fix things up as
864 * needed.
865 */
866
867 if (rt_flag)
868 blocksize_bytes = XFS_FSB_TO_B(mp, mp->m_sb.sb_rextsize);
869 else
870 blocksize_bytes = mp->m_sb.sb_blocksize;
871
872 if ((hint_flag || inherit_flag) && !(S_ISDIR(mode) || S_ISREG(mode)))
873 return __this_address;
874
875 if (hint_flag && !S_ISREG(mode))
876 return __this_address;
877
878 if (inherit_flag && !S_ISDIR(mode))
879 return __this_address;
880
881 if ((hint_flag || inherit_flag) && extsize == 0)
882 return __this_address;
883
884 /* free inodes get flags set to zero but extsize remains */
885 if (mode && !(hint_flag || inherit_flag) && extsize != 0)
886 return __this_address;
887
888 if (extsize_bytes % blocksize_bytes)
889 return __this_address;
890
891 if (extsize > XFS_MAX_BMBT_EXTLEN)
892 return __this_address;
893
894 if (!rt_flag && extsize > mp->m_sb.sb_agblocks / 2)
895 return __this_address;
896
897 return NULL;
898 }
899
900 /*
901 * Validate di_cowextsize hint.
902 *
903 * 1. CoW extent size hint can only be set if reflink is enabled on the fs.
904 * The inode does not have to have any shared blocks, but it must be a v3.
905 * 2. FS_XFLAG_COWEXTSIZE is only valid for directories and regular files;
906 * for a directory, the hint is propagated to new files.
907 * 3. Can be changed on files & directories at any time.
908 * 4. Hint value of 0 turns off hints, clears inode flags.
909 * 5. Extent size must be a multiple of the appropriate block size.
910 * 6. The extent size hint must be limited to half the AG size to avoid
911 * alignment extending the extent beyond the limits of the AG.
912 */
913 xfs_failaddr_t
xfs_inode_validate_cowextsize(struct xfs_mount * mp,uint32_t cowextsize,uint16_t mode,uint16_t flags,uint64_t flags2)914 xfs_inode_validate_cowextsize(
915 struct xfs_mount *mp,
916 uint32_t cowextsize,
917 uint16_t mode,
918 uint16_t flags,
919 uint64_t flags2)
920 {
921 bool rt_flag;
922 bool hint_flag;
923 uint32_t cowextsize_bytes;
924 uint32_t blocksize_bytes;
925
926 rt_flag = (flags & XFS_DIFLAG_REALTIME);
927 hint_flag = (flags2 & XFS_DIFLAG2_COWEXTSIZE);
928 cowextsize_bytes = XFS_FSB_TO_B(mp, cowextsize);
929
930 /*
931 * Similar to extent size hints, a directory can be configured to
932 * propagate realtime status and a CoW extent size hint to newly
933 * created files even if there is no realtime device, and the hints on
934 * disk can become misaligned if the sysadmin changes the rt extent
935 * size while adding the realtime device.
936 *
937 * Therefore, we can only enforce the rextsize alignment check against
938 * regular realtime files, and rely on callers to decide when alignment
939 * checks are appropriate, and fix things up as needed.
940 */
941
942 if (rt_flag)
943 blocksize_bytes = XFS_FSB_TO_B(mp, mp->m_sb.sb_rextsize);
944 else
945 blocksize_bytes = mp->m_sb.sb_blocksize;
946
947 if (hint_flag && !xfs_has_reflink(mp))
948 return __this_address;
949
950 if (hint_flag && !(S_ISDIR(mode) || S_ISREG(mode)))
951 return __this_address;
952
953 if (hint_flag && cowextsize == 0)
954 return __this_address;
955
956 /* free inodes get flags set to zero but cowextsize remains */
957 if (mode && !hint_flag && cowextsize != 0)
958 return __this_address;
959
960 if (cowextsize_bytes % blocksize_bytes)
961 return __this_address;
962
963 if (cowextsize > XFS_MAX_BMBT_EXTLEN)
964 return __this_address;
965
966 if (!rt_flag && cowextsize > mp->m_sb.sb_agblocks / 2)
967 return __this_address;
968
969 return NULL;
970 }
971