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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 */
41static void
42xfs_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
87static void
88xfs_inode_buf_read_verify(
89 struct xfs_buf *bp)
90{
91 xfs_inode_buf_verify(bp, false);
92}
93
94static void
95xfs_inode_buf_readahead_verify(
96 struct xfs_buf *bp)
97{
98 xfs_inode_buf_verify(bp, true);
99}
100
101static void
102xfs_inode_buf_write_verify(
103 struct xfs_buf *bp)
104{
105 xfs_inode_buf_verify(bp, false);
106}
107
108const 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
116const 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 */
130int
131xfs_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, XBF_UNMAPPED, 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
147static 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. */
159struct timespec64
160xfs_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
177int
178xfs_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 ip->i_cowextsize = be32_to_cpu(from->di_cowextsize);
256 }
257
258 error = xfs_iformat_data_fork(ip, from);
259 if (error)
260 return error;
261 if (from->di_forkoff) {
262 error = xfs_iformat_attr_fork(ip, from);
263 if (error)
264 goto out_destroy_data_fork;
265 }
266 if (xfs_is_reflink_inode(ip))
267 xfs_ifork_init_cow(ip);
268 return 0;
269
270out_destroy_data_fork:
271 xfs_idestroy_fork(&ip->i_df);
272 return error;
273}
274
275/* Convert an incore timestamp to an ondisk timestamp. */
276static inline xfs_timestamp_t
277xfs_inode_to_disk_ts(
278 struct xfs_inode *ip,
279 const struct timespec64 tv)
280{
281 struct xfs_legacy_timestamp *lts;
282 xfs_timestamp_t ts;
283
284 if (xfs_inode_has_bigtime(ip))
285 return cpu_to_be64(xfs_inode_encode_bigtime(tv));
286
287 lts = (struct xfs_legacy_timestamp *)&ts;
288 lts->t_sec = cpu_to_be32(tv.tv_sec);
289 lts->t_nsec = cpu_to_be32(tv.tv_nsec);
290
291 return ts;
292}
293
294static inline void
295xfs_inode_to_disk_iext_counters(
296 struct xfs_inode *ip,
297 struct xfs_dinode *to)
298{
299 if (xfs_inode_has_large_extent_counts(ip)) {
300 to->di_big_nextents = cpu_to_be64(xfs_ifork_nextents(&ip->i_df));
301 to->di_big_anextents = cpu_to_be32(xfs_ifork_nextents(&ip->i_af));
302 /*
303 * We might be upgrading the inode to use larger extent counters
304 * than was previously used. Hence zero the unused field.
305 */
306 to->di_nrext64_pad = cpu_to_be16(0);
307 } else {
308 to->di_nextents = cpu_to_be32(xfs_ifork_nextents(&ip->i_df));
309 to->di_anextents = cpu_to_be16(xfs_ifork_nextents(&ip->i_af));
310 }
311}
312
313void
314xfs_inode_to_disk(
315 struct xfs_inode *ip,
316 struct xfs_dinode *to,
317 xfs_lsn_t lsn)
318{
319 struct inode *inode = VFS_I(ip);
320
321 to->di_magic = cpu_to_be16(XFS_DINODE_MAGIC);
322 if (xfs_is_metadir_inode(ip))
323 to->di_metatype = cpu_to_be16(ip->i_metatype);
324 else
325 to->di_metatype = 0;
326
327 to->di_format = xfs_ifork_format(&ip->i_df);
328 to->di_uid = cpu_to_be32(i_uid_read(inode));
329 to->di_gid = cpu_to_be32(i_gid_read(inode));
330 to->di_projid_lo = cpu_to_be16(ip->i_projid & 0xffff);
331 to->di_projid_hi = cpu_to_be16(ip->i_projid >> 16);
332
333 to->di_atime = xfs_inode_to_disk_ts(ip, inode_get_atime(inode));
334 to->di_mtime = xfs_inode_to_disk_ts(ip, inode_get_mtime(inode));
335 to->di_ctime = xfs_inode_to_disk_ts(ip, inode_get_ctime(inode));
336 to->di_nlink = cpu_to_be32(inode->i_nlink);
337 to->di_gen = cpu_to_be32(inode->i_generation);
338 to->di_mode = cpu_to_be16(inode->i_mode);
339
340 to->di_size = cpu_to_be64(ip->i_disk_size);
341 to->di_nblocks = cpu_to_be64(ip->i_nblocks);
342 to->di_extsize = cpu_to_be32(ip->i_extsize);
343 to->di_forkoff = ip->i_forkoff;
344 to->di_aformat = xfs_ifork_format(&ip->i_af);
345 to->di_flags = cpu_to_be16(ip->i_diflags);
346
347 if (xfs_has_v3inodes(ip->i_mount)) {
348 to->di_version = 3;
349 to->di_changecount = cpu_to_be64(inode_peek_iversion(inode));
350 to->di_crtime = xfs_inode_to_disk_ts(ip, ip->i_crtime);
351 to->di_flags2 = cpu_to_be64(ip->i_diflags2);
352 to->di_cowextsize = cpu_to_be32(ip->i_cowextsize);
353 to->di_ino = cpu_to_be64(ip->i_ino);
354 to->di_lsn = cpu_to_be64(lsn);
355 memset(to->di_pad2, 0, sizeof(to->di_pad2));
356 uuid_copy(&to->di_uuid, &ip->i_mount->m_sb.sb_meta_uuid);
357 to->di_v3_pad = 0;
358 } else {
359 to->di_version = 2;
360 to->di_flushiter = cpu_to_be16(ip->i_flushiter);
361 memset(to->di_v2_pad, 0, sizeof(to->di_v2_pad));
362 }
363
364 xfs_inode_to_disk_iext_counters(ip, to);
365}
366
367static xfs_failaddr_t
368xfs_dinode_verify_fork(
369 struct xfs_dinode *dip,
370 struct xfs_mount *mp,
371 int whichfork)
372{
373 xfs_extnum_t di_nextents;
374 xfs_extnum_t max_extents;
375 mode_t mode = be16_to_cpu(dip->di_mode);
376 uint32_t fork_size = XFS_DFORK_SIZE(dip, mp, whichfork);
377 uint32_t fork_format = XFS_DFORK_FORMAT(dip, whichfork);
378
379 di_nextents = xfs_dfork_nextents(dip, whichfork);
380
381 /*
382 * For fork types that can contain local data, check that the fork
383 * format matches the size of local data contained within the fork.
384 */
385 if (whichfork == XFS_DATA_FORK) {
386 /*
387 * A directory small enough to fit in the inode must be stored
388 * in local format. The directory sf <-> extents conversion
389 * code updates the directory size accordingly. Directories
390 * being truncated have zero size and are not subject to this
391 * check.
392 */
393 if (S_ISDIR(mode)) {
394 if (dip->di_size &&
395 be64_to_cpu(dip->di_size) <= fork_size &&
396 fork_format != XFS_DINODE_FMT_LOCAL)
397 return __this_address;
398 }
399
400 /*
401 * A symlink with a target small enough to fit in the inode can
402 * be stored in extents format if xattrs were added (thus
403 * converting the data fork from shortform to remote format)
404 * and then removed.
405 */
406 if (S_ISLNK(mode)) {
407 if (be64_to_cpu(dip->di_size) <= fork_size &&
408 fork_format != XFS_DINODE_FMT_EXTENTS &&
409 fork_format != XFS_DINODE_FMT_LOCAL)
410 return __this_address;
411 }
412
413 /*
414 * For all types, check that when the size says the fork should
415 * be in extent or btree format, the inode isn't claiming to be
416 * in local format.
417 */
418 if (be64_to_cpu(dip->di_size) > fork_size &&
419 fork_format == XFS_DINODE_FMT_LOCAL)
420 return __this_address;
421 }
422
423 switch (fork_format) {
424 case XFS_DINODE_FMT_LOCAL:
425 /*
426 * No local regular files yet.
427 */
428 if (S_ISREG(mode) && whichfork == XFS_DATA_FORK)
429 return __this_address;
430 if (di_nextents)
431 return __this_address;
432 break;
433 case XFS_DINODE_FMT_EXTENTS:
434 if (di_nextents > XFS_DFORK_MAXEXT(dip, mp, whichfork))
435 return __this_address;
436 break;
437 case XFS_DINODE_FMT_BTREE:
438 max_extents = xfs_iext_max_nextents(
439 xfs_dinode_has_large_extent_counts(dip),
440 whichfork);
441 if (di_nextents > max_extents)
442 return __this_address;
443 break;
444 default:
445 return __this_address;
446 }
447 return NULL;
448}
449
450static xfs_failaddr_t
451xfs_dinode_verify_forkoff(
452 struct xfs_dinode *dip,
453 struct xfs_mount *mp)
454{
455 if (!dip->di_forkoff)
456 return NULL;
457
458 switch (dip->di_format) {
459 case XFS_DINODE_FMT_DEV:
460 if (dip->di_forkoff != (roundup(sizeof(xfs_dev_t), 8) >> 3))
461 return __this_address;
462 break;
463 case XFS_DINODE_FMT_LOCAL: /* fall through ... */
464 case XFS_DINODE_FMT_EXTENTS: /* fall through ... */
465 case XFS_DINODE_FMT_BTREE:
466 if (dip->di_forkoff >= (XFS_LITINO(mp) >> 3))
467 return __this_address;
468 break;
469 default:
470 return __this_address;
471 }
472 return NULL;
473}
474
475static xfs_failaddr_t
476xfs_dinode_verify_nrext64(
477 struct xfs_mount *mp,
478 struct xfs_dinode *dip)
479{
480 if (xfs_dinode_has_large_extent_counts(dip)) {
481 if (!xfs_has_large_extent_counts(mp))
482 return __this_address;
483 if (dip->di_nrext64_pad != 0)
484 return __this_address;
485 } else if (dip->di_version >= 3) {
486 if (dip->di_v3_pad != 0)
487 return __this_address;
488 }
489
490 return NULL;
491}
492
493/*
494 * Validate all the picky requirements we have for a file that claims to be
495 * filesystem metadata.
496 */
497xfs_failaddr_t
498xfs_dinode_verify_metadir(
499 struct xfs_mount *mp,
500 struct xfs_dinode *dip,
501 uint16_t mode,
502 uint16_t flags,
503 uint64_t flags2)
504{
505 if (!xfs_has_metadir(mp))
506 return __this_address;
507
508 /* V5 filesystem only */
509 if (dip->di_version < 3)
510 return __this_address;
511
512 if (be16_to_cpu(dip->di_metatype) >= XFS_METAFILE_MAX)
513 return __this_address;
514
515 /* V3 inode fields that are always zero */
516 if ((flags2 & XFS_DIFLAG2_NREXT64) && dip->di_nrext64_pad)
517 return __this_address;
518 if (!(flags2 & XFS_DIFLAG2_NREXT64) && dip->di_flushiter)
519 return __this_address;
520
521 /* Metadata files can only be directories or regular files */
522 if (!S_ISDIR(mode) && !S_ISREG(mode))
523 return __this_address;
524
525 /* They must have zero access permissions */
526 if (mode & 0777)
527 return __this_address;
528
529 /* DMAPI event and state masks are zero */
530 if (dip->di_dmevmask || dip->di_dmstate)
531 return __this_address;
532
533 /*
534 * User and group IDs must be zero. The project ID is used for
535 * grouping inodes. Metadata inodes are never accounted to quotas.
536 */
537 if (dip->di_uid || dip->di_gid)
538 return __this_address;
539
540 /* Mandatory inode flags must be set */
541 if (S_ISDIR(mode)) {
542 if ((flags & XFS_METADIR_DIFLAGS) != XFS_METADIR_DIFLAGS)
543 return __this_address;
544 } else {
545 if ((flags & XFS_METAFILE_DIFLAGS) != XFS_METAFILE_DIFLAGS)
546 return __this_address;
547 }
548
549 /* dax flags2 must not be set */
550 if (flags2 & XFS_DIFLAG2_DAX)
551 return __this_address;
552
553 return NULL;
554}
555
556xfs_failaddr_t
557xfs_dinode_verify(
558 struct xfs_mount *mp,
559 xfs_ino_t ino,
560 struct xfs_dinode *dip)
561{
562 xfs_failaddr_t fa;
563 uint16_t mode;
564 uint16_t flags;
565 uint64_t flags2;
566 uint64_t di_size;
567 xfs_extnum_t nextents;
568 xfs_extnum_t naextents;
569 xfs_filblks_t nblocks;
570
571 if (dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC))
572 return __this_address;
573
574 /* Verify v3 integrity information first */
575 if (dip->di_version >= 3) {
576 if (!xfs_has_v3inodes(mp))
577 return __this_address;
578 if (!xfs_verify_cksum((char *)dip, mp->m_sb.sb_inodesize,
579 XFS_DINODE_CRC_OFF))
580 return __this_address;
581 if (be64_to_cpu(dip->di_ino) != ino)
582 return __this_address;
583 if (!uuid_equal(&dip->di_uuid, &mp->m_sb.sb_meta_uuid))
584 return __this_address;
585 }
586
587 /*
588 * Historical note: xfsprogs in the 3.2 era set up its incore inodes to
589 * have di_nlink track the link count, even if the actual filesystem
590 * only supported V1 inodes (i.e. di_onlink). When writing out the
591 * ondisk inode, it would set both the ondisk di_nlink and di_onlink to
592 * the the incore di_nlink value, which is why we cannot check for
593 * di_nlink==0 on a V1 inode. V2/3 inodes would get written out with
594 * di_onlink==0, so we can check that.
595 */
596 if (dip->di_version == 2) {
597 if (dip->di_metatype)
598 return __this_address;
599 } else if (dip->di_version >= 3) {
600 if (!xfs_dinode_is_metadir(dip) && dip->di_metatype)
601 return __this_address;
602 }
603
604 /* don't allow invalid i_size */
605 di_size = be64_to_cpu(dip->di_size);
606 if (di_size & (1ULL << 63))
607 return __this_address;
608
609 mode = be16_to_cpu(dip->di_mode);
610 if (mode && xfs_mode_to_ftype(mode) == XFS_DIR3_FT_UNKNOWN)
611 return __this_address;
612
613 /*
614 * No zero-length symlinks/dirs unless they're unlinked and hence being
615 * inactivated.
616 */
617 if ((S_ISLNK(mode) || S_ISDIR(mode)) && di_size == 0) {
618 if (dip->di_version > 1) {
619 if (dip->di_nlink)
620 return __this_address;
621 } else {
622 /* di_metatype used to be di_onlink */
623 if (dip->di_metatype)
624 return __this_address;
625 }
626 }
627
628 fa = xfs_dinode_verify_nrext64(mp, dip);
629 if (fa)
630 return fa;
631
632 nextents = xfs_dfork_data_extents(dip);
633 naextents = xfs_dfork_attr_extents(dip);
634 nblocks = be64_to_cpu(dip->di_nblocks);
635
636 /* Fork checks carried over from xfs_iformat_fork */
637 if (mode && nextents + naextents > nblocks)
638 return __this_address;
639
640 if (nextents + naextents == 0 && nblocks != 0)
641 return __this_address;
642
643 if (S_ISDIR(mode) && nextents > mp->m_dir_geo->max_extents)
644 return __this_address;
645
646 if (mode && XFS_DFORK_BOFF(dip) > mp->m_sb.sb_inodesize)
647 return __this_address;
648
649 flags = be16_to_cpu(dip->di_flags);
650
651 if (mode && (flags & XFS_DIFLAG_REALTIME) && !mp->m_rtdev_targp)
652 return __this_address;
653
654 /* check for illegal values of forkoff */
655 fa = xfs_dinode_verify_forkoff(dip, mp);
656 if (fa)
657 return fa;
658
659 /* Do we have appropriate data fork formats for the mode? */
660 switch (mode & S_IFMT) {
661 case S_IFIFO:
662 case S_IFCHR:
663 case S_IFBLK:
664 case S_IFSOCK:
665 if (dip->di_format != XFS_DINODE_FMT_DEV)
666 return __this_address;
667 break;
668 case S_IFREG:
669 case S_IFLNK:
670 case S_IFDIR:
671 fa = xfs_dinode_verify_fork(dip, mp, XFS_DATA_FORK);
672 if (fa)
673 return fa;
674 break;
675 case 0:
676 /* Uninitialized inode ok. */
677 break;
678 default:
679 return __this_address;
680 }
681
682 if (dip->di_forkoff) {
683 fa = xfs_dinode_verify_fork(dip, mp, XFS_ATTR_FORK);
684 if (fa)
685 return fa;
686 } else {
687 /*
688 * If there is no fork offset, this may be a freshly-made inode
689 * in a new disk cluster, in which case di_aformat is zeroed.
690 * Otherwise, such an inode must be in EXTENTS format; this goes
691 * for freed inodes as well.
692 */
693 switch (dip->di_aformat) {
694 case 0:
695 case XFS_DINODE_FMT_EXTENTS:
696 break;
697 default:
698 return __this_address;
699 }
700 if (naextents)
701 return __this_address;
702 }
703
704 /* extent size hint validation */
705 fa = xfs_inode_validate_extsize(mp, be32_to_cpu(dip->di_extsize),
706 mode, flags);
707 if (fa)
708 return fa;
709
710 /* only version 3 or greater inodes are extensively verified here */
711 if (dip->di_version < 3)
712 return NULL;
713
714 flags2 = be64_to_cpu(dip->di_flags2);
715
716 /* don't allow reflink/cowextsize if we don't have reflink */
717 if ((flags2 & (XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE)) &&
718 !xfs_has_reflink(mp))
719 return __this_address;
720
721 /* only regular files get reflink */
722 if ((flags2 & XFS_DIFLAG2_REFLINK) && (mode & S_IFMT) != S_IFREG)
723 return __this_address;
724
725 /* don't let reflink and realtime mix */
726 if ((flags2 & XFS_DIFLAG2_REFLINK) && (flags & XFS_DIFLAG_REALTIME))
727 return __this_address;
728
729 /* COW extent size hint validation */
730 fa = xfs_inode_validate_cowextsize(mp, be32_to_cpu(dip->di_cowextsize),
731 mode, flags, flags2);
732 if (fa)
733 return fa;
734
735 /* bigtime iflag can only happen on bigtime filesystems */
736 if (xfs_dinode_has_bigtime(dip) &&
737 !xfs_has_bigtime(mp))
738 return __this_address;
739
740 if (flags2 & XFS_DIFLAG2_METADATA) {
741 fa = xfs_dinode_verify_metadir(mp, dip, mode, flags, flags2);
742 if (fa)
743 return fa;
744 }
745
746 return NULL;
747}
748
749void
750xfs_dinode_calc_crc(
751 struct xfs_mount *mp,
752 struct xfs_dinode *dip)
753{
754 uint32_t crc;
755
756 if (dip->di_version < 3)
757 return;
758
759 ASSERT(xfs_has_crc(mp));
760 crc = xfs_start_cksum_update((char *)dip, mp->m_sb.sb_inodesize,
761 XFS_DINODE_CRC_OFF);
762 dip->di_crc = xfs_end_cksum(crc);
763}
764
765/*
766 * Validate di_extsize hint.
767 *
768 * 1. Extent size hint is only valid for directories and regular files.
769 * 2. FS_XFLAG_EXTSIZE is only valid for regular files.
770 * 3. FS_XFLAG_EXTSZINHERIT is only valid for directories.
771 * 4. Hint cannot be larger than MAXTEXTLEN.
772 * 5. Can be changed on directories at any time.
773 * 6. Hint value of 0 turns off hints, clears inode flags.
774 * 7. Extent size must be a multiple of the appropriate block size.
775 * For realtime files, this is the rt extent size.
776 * 8. For non-realtime files, the extent size hint must be limited
777 * to half the AG size to avoid alignment extending the extent beyond the
778 * limits of the AG.
779 */
780xfs_failaddr_t
781xfs_inode_validate_extsize(
782 struct xfs_mount *mp,
783 uint32_t extsize,
784 uint16_t mode,
785 uint16_t flags)
786{
787 bool rt_flag;
788 bool hint_flag;
789 bool inherit_flag;
790 uint32_t extsize_bytes;
791 uint32_t blocksize_bytes;
792
793 rt_flag = (flags & XFS_DIFLAG_REALTIME);
794 hint_flag = (flags & XFS_DIFLAG_EXTSIZE);
795 inherit_flag = (flags & XFS_DIFLAG_EXTSZINHERIT);
796 extsize_bytes = XFS_FSB_TO_B(mp, extsize);
797
798 /*
799 * This comment describes a historic gap in this verifier function.
800 *
801 * For a directory with both RTINHERIT and EXTSZINHERIT flags set, this
802 * function has never checked that the extent size hint is an integer
803 * multiple of the realtime extent size. Since we allow users to set
804 * this combination on non-rt filesystems /and/ to change the rt
805 * extent size when adding a rt device to a filesystem, the net effect
806 * is that users can configure a filesystem anticipating one rt
807 * geometry and change their minds later. Directories do not use the
808 * extent size hint, so this is harmless for them.
809 *
810 * If a directory with a misaligned extent size hint is allowed to
811 * propagate that hint into a new regular realtime file, the result
812 * is that the inode cluster buffer verifier will trigger a corruption
813 * shutdown the next time it is run, because the verifier has always
814 * enforced the alignment rule for regular files.
815 *
816 * Because we allow administrators to set a new rt extent size when
817 * adding a rt section, we cannot add a check to this verifier because
818 * that will result a new source of directory corruption errors when
819 * reading an existing filesystem. Instead, we rely on callers to
820 * decide when alignment checks are appropriate, and fix things up as
821 * needed.
822 */
823
824 if (rt_flag)
825 blocksize_bytes = XFS_FSB_TO_B(mp, mp->m_sb.sb_rextsize);
826 else
827 blocksize_bytes = mp->m_sb.sb_blocksize;
828
829 if ((hint_flag || inherit_flag) && !(S_ISDIR(mode) || S_ISREG(mode)))
830 return __this_address;
831
832 if (hint_flag && !S_ISREG(mode))
833 return __this_address;
834
835 if (inherit_flag && !S_ISDIR(mode))
836 return __this_address;
837
838 if ((hint_flag || inherit_flag) && extsize == 0)
839 return __this_address;
840
841 /* free inodes get flags set to zero but extsize remains */
842 if (mode && !(hint_flag || inherit_flag) && extsize != 0)
843 return __this_address;
844
845 if (extsize_bytes % blocksize_bytes)
846 return __this_address;
847
848 if (extsize > XFS_MAX_BMBT_EXTLEN)
849 return __this_address;
850
851 if (!rt_flag && extsize > mp->m_sb.sb_agblocks / 2)
852 return __this_address;
853
854 return NULL;
855}
856
857/*
858 * Validate di_cowextsize hint.
859 *
860 * 1. CoW extent size hint can only be set if reflink is enabled on the fs.
861 * The inode does not have to have any shared blocks, but it must be a v3.
862 * 2. FS_XFLAG_COWEXTSIZE is only valid for directories and regular files;
863 * for a directory, the hint is propagated to new files.
864 * 3. Can be changed on files & directories at any time.
865 * 4. Hint value of 0 turns off hints, clears inode flags.
866 * 5. Extent size must be a multiple of the appropriate block size.
867 * 6. The extent size hint must be limited to half the AG size to avoid
868 * alignment extending the extent beyond the limits of the AG.
869 */
870xfs_failaddr_t
871xfs_inode_validate_cowextsize(
872 struct xfs_mount *mp,
873 uint32_t cowextsize,
874 uint16_t mode,
875 uint16_t flags,
876 uint64_t flags2)
877{
878 bool rt_flag;
879 bool hint_flag;
880 uint32_t cowextsize_bytes;
881
882 rt_flag = (flags & XFS_DIFLAG_REALTIME);
883 hint_flag = (flags2 & XFS_DIFLAG2_COWEXTSIZE);
884 cowextsize_bytes = XFS_FSB_TO_B(mp, cowextsize);
885
886 if (hint_flag && !xfs_has_reflink(mp))
887 return __this_address;
888
889 if (hint_flag && !(S_ISDIR(mode) || S_ISREG(mode)))
890 return __this_address;
891
892 if (hint_flag && cowextsize == 0)
893 return __this_address;
894
895 /* free inodes get flags set to zero but cowextsize remains */
896 if (mode && !hint_flag && cowextsize != 0)
897 return __this_address;
898
899 if (hint_flag && rt_flag)
900 return __this_address;
901
902 if (cowextsize_bytes % mp->m_sb.sb_blocksize)
903 return __this_address;
904
905 if (cowextsize > XFS_MAX_BMBT_EXTLEN)
906 return __this_address;
907
908 if (cowextsize > mp->m_sb.sb_agblocks / 2)
909 return __this_address;
910
911 return NULL;
912}
1/*
2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18#include "xfs.h"
19#include "xfs_fs.h"
20#include "xfs_shared.h"
21#include "xfs_format.h"
22#include "xfs_log_format.h"
23#include "xfs_trans_resv.h"
24#include "xfs_mount.h"
25#include "xfs_inode.h"
26#include "xfs_error.h"
27#include "xfs_cksum.h"
28#include "xfs_icache.h"
29#include "xfs_trans.h"
30#include "xfs_ialloc.h"
31
32/*
33 * Check that none of the inode's in the buffer have a next
34 * unlinked field of 0.
35 */
36#if defined(DEBUG)
37void
38xfs_inobp_check(
39 xfs_mount_t *mp,
40 xfs_buf_t *bp)
41{
42 int i;
43 int j;
44 xfs_dinode_t *dip;
45
46 j = mp->m_inode_cluster_size >> mp->m_sb.sb_inodelog;
47
48 for (i = 0; i < j; i++) {
49 dip = xfs_buf_offset(bp, i * mp->m_sb.sb_inodesize);
50 if (!dip->di_next_unlinked) {
51 xfs_alert(mp,
52 "Detected bogus zero next_unlinked field in inode %d buffer 0x%llx.",
53 i, (long long)bp->b_bn);
54 }
55 }
56}
57#endif
58
59/*
60 * If we are doing readahead on an inode buffer, we might be in log recovery
61 * reading an inode allocation buffer that hasn't yet been replayed, and hence
62 * has not had the inode cores stamped into it. Hence for readahead, the buffer
63 * may be potentially invalid.
64 *
65 * If the readahead buffer is invalid, we need to mark it with an error and
66 * clear the DONE status of the buffer so that a followup read will re-read it
67 * from disk. We don't report the error otherwise to avoid warnings during log
68 * recovery and we don't get unnecssary panics on debug kernels. We use EIO here
69 * because all we want to do is say readahead failed; there is no-one to report
70 * the error to, so this will distinguish it from a non-ra verifier failure.
71 * Changes to this readahead error behavour also need to be reflected in
72 * xfs_dquot_buf_readahead_verify().
73 */
74static void
75xfs_inode_buf_verify(
76 struct xfs_buf *bp,
77 bool readahead)
78{
79 struct xfs_mount *mp = bp->b_target->bt_mount;
80 int i;
81 int ni;
82
83 /*
84 * Validate the magic number and version of every inode in the buffer
85 */
86 ni = XFS_BB_TO_FSB(mp, bp->b_length) * mp->m_sb.sb_inopblock;
87 for (i = 0; i < ni; i++) {
88 int di_ok;
89 xfs_dinode_t *dip;
90
91 dip = xfs_buf_offset(bp, (i << mp->m_sb.sb_inodelog));
92 di_ok = dip->di_magic == cpu_to_be16(XFS_DINODE_MAGIC) &&
93 XFS_DINODE_GOOD_VERSION(dip->di_version);
94 if (unlikely(XFS_TEST_ERROR(!di_ok, mp,
95 XFS_ERRTAG_ITOBP_INOTOBP,
96 XFS_RANDOM_ITOBP_INOTOBP))) {
97 if (readahead) {
98 bp->b_flags &= ~XBF_DONE;
99 xfs_buf_ioerror(bp, -EIO);
100 return;
101 }
102
103 xfs_buf_ioerror(bp, -EFSCORRUPTED);
104 xfs_verifier_error(bp);
105#ifdef DEBUG
106 xfs_alert(mp,
107 "bad inode magic/vsn daddr %lld #%d (magic=%x)",
108 (unsigned long long)bp->b_bn, i,
109 be16_to_cpu(dip->di_magic));
110#endif
111 }
112 }
113 xfs_inobp_check(mp, bp);
114}
115
116
117static void
118xfs_inode_buf_read_verify(
119 struct xfs_buf *bp)
120{
121 xfs_inode_buf_verify(bp, false);
122}
123
124static void
125xfs_inode_buf_readahead_verify(
126 struct xfs_buf *bp)
127{
128 xfs_inode_buf_verify(bp, true);
129}
130
131static void
132xfs_inode_buf_write_verify(
133 struct xfs_buf *bp)
134{
135 xfs_inode_buf_verify(bp, false);
136}
137
138const struct xfs_buf_ops xfs_inode_buf_ops = {
139 .name = "xfs_inode",
140 .verify_read = xfs_inode_buf_read_verify,
141 .verify_write = xfs_inode_buf_write_verify,
142};
143
144const struct xfs_buf_ops xfs_inode_buf_ra_ops = {
145 .name = "xxfs_inode_ra",
146 .verify_read = xfs_inode_buf_readahead_verify,
147 .verify_write = xfs_inode_buf_write_verify,
148};
149
150
151/*
152 * This routine is called to map an inode to the buffer containing the on-disk
153 * version of the inode. It returns a pointer to the buffer containing the
154 * on-disk inode in the bpp parameter, and in the dipp parameter it returns a
155 * pointer to the on-disk inode within that buffer.
156 *
157 * If a non-zero error is returned, then the contents of bpp and dipp are
158 * undefined.
159 */
160int
161xfs_imap_to_bp(
162 struct xfs_mount *mp,
163 struct xfs_trans *tp,
164 struct xfs_imap *imap,
165 struct xfs_dinode **dipp,
166 struct xfs_buf **bpp,
167 uint buf_flags,
168 uint iget_flags)
169{
170 struct xfs_buf *bp;
171 int error;
172
173 buf_flags |= XBF_UNMAPPED;
174 error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, imap->im_blkno,
175 (int)imap->im_len, buf_flags, &bp,
176 &xfs_inode_buf_ops);
177 if (error) {
178 if (error == -EAGAIN) {
179 ASSERT(buf_flags & XBF_TRYLOCK);
180 return error;
181 }
182
183 if (error == -EFSCORRUPTED &&
184 (iget_flags & XFS_IGET_UNTRUSTED))
185 return -EINVAL;
186
187 xfs_warn(mp, "%s: xfs_trans_read_buf() returned error %d.",
188 __func__, error);
189 return error;
190 }
191
192 *bpp = bp;
193 *dipp = xfs_buf_offset(bp, imap->im_boffset);
194 return 0;
195}
196
197void
198xfs_inode_from_disk(
199 struct xfs_inode *ip,
200 struct xfs_dinode *from)
201{
202 struct xfs_icdinode *to = &ip->i_d;
203 struct inode *inode = VFS_I(ip);
204
205
206 /*
207 * Convert v1 inodes immediately to v2 inode format as this is the
208 * minimum inode version format we support in the rest of the code.
209 */
210 to->di_version = from->di_version;
211 if (to->di_version == 1) {
212 set_nlink(inode, be16_to_cpu(from->di_onlink));
213 to->di_projid_lo = 0;
214 to->di_projid_hi = 0;
215 to->di_version = 2;
216 } else {
217 set_nlink(inode, be32_to_cpu(from->di_nlink));
218 to->di_projid_lo = be16_to_cpu(from->di_projid_lo);
219 to->di_projid_hi = be16_to_cpu(from->di_projid_hi);
220 }
221
222 to->di_format = from->di_format;
223 to->di_uid = be32_to_cpu(from->di_uid);
224 to->di_gid = be32_to_cpu(from->di_gid);
225 to->di_flushiter = be16_to_cpu(from->di_flushiter);
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->i_atime.tv_sec = (int)be32_to_cpu(from->di_atime.t_sec);
234 inode->i_atime.tv_nsec = (int)be32_to_cpu(from->di_atime.t_nsec);
235 inode->i_mtime.tv_sec = (int)be32_to_cpu(from->di_mtime.t_sec);
236 inode->i_mtime.tv_nsec = (int)be32_to_cpu(from->di_mtime.t_nsec);
237 inode->i_ctime.tv_sec = (int)be32_to_cpu(from->di_ctime.t_sec);
238 inode->i_ctime.tv_nsec = (int)be32_to_cpu(from->di_ctime.t_nsec);
239 inode->i_generation = be32_to_cpu(from->di_gen);
240 inode->i_mode = be16_to_cpu(from->di_mode);
241
242 to->di_size = be64_to_cpu(from->di_size);
243 to->di_nblocks = be64_to_cpu(from->di_nblocks);
244 to->di_extsize = be32_to_cpu(from->di_extsize);
245 to->di_nextents = be32_to_cpu(from->di_nextents);
246 to->di_anextents = be16_to_cpu(from->di_anextents);
247 to->di_forkoff = from->di_forkoff;
248 to->di_aformat = from->di_aformat;
249 to->di_dmevmask = be32_to_cpu(from->di_dmevmask);
250 to->di_dmstate = be16_to_cpu(from->di_dmstate);
251 to->di_flags = be16_to_cpu(from->di_flags);
252
253 if (to->di_version == 3) {
254 inode->i_version = be64_to_cpu(from->di_changecount);
255 to->di_crtime.t_sec = be32_to_cpu(from->di_crtime.t_sec);
256 to->di_crtime.t_nsec = be32_to_cpu(from->di_crtime.t_nsec);
257 to->di_flags2 = be64_to_cpu(from->di_flags2);
258 }
259}
260
261void
262xfs_inode_to_disk(
263 struct xfs_inode *ip,
264 struct xfs_dinode *to,
265 xfs_lsn_t lsn)
266{
267 struct xfs_icdinode *from = &ip->i_d;
268 struct inode *inode = VFS_I(ip);
269
270 to->di_magic = cpu_to_be16(XFS_DINODE_MAGIC);
271 to->di_onlink = 0;
272
273 to->di_version = from->di_version;
274 to->di_format = from->di_format;
275 to->di_uid = cpu_to_be32(from->di_uid);
276 to->di_gid = cpu_to_be32(from->di_gid);
277 to->di_projid_lo = cpu_to_be16(from->di_projid_lo);
278 to->di_projid_hi = cpu_to_be16(from->di_projid_hi);
279
280 memset(to->di_pad, 0, sizeof(to->di_pad));
281 to->di_atime.t_sec = cpu_to_be32(inode->i_atime.tv_sec);
282 to->di_atime.t_nsec = cpu_to_be32(inode->i_atime.tv_nsec);
283 to->di_mtime.t_sec = cpu_to_be32(inode->i_mtime.tv_sec);
284 to->di_mtime.t_nsec = cpu_to_be32(inode->i_mtime.tv_nsec);
285 to->di_ctime.t_sec = cpu_to_be32(inode->i_ctime.tv_sec);
286 to->di_ctime.t_nsec = cpu_to_be32(inode->i_ctime.tv_nsec);
287 to->di_nlink = cpu_to_be32(inode->i_nlink);
288 to->di_gen = cpu_to_be32(inode->i_generation);
289 to->di_mode = cpu_to_be16(inode->i_mode);
290
291 to->di_size = cpu_to_be64(from->di_size);
292 to->di_nblocks = cpu_to_be64(from->di_nblocks);
293 to->di_extsize = cpu_to_be32(from->di_extsize);
294 to->di_nextents = cpu_to_be32(from->di_nextents);
295 to->di_anextents = cpu_to_be16(from->di_anextents);
296 to->di_forkoff = from->di_forkoff;
297 to->di_aformat = from->di_aformat;
298 to->di_dmevmask = cpu_to_be32(from->di_dmevmask);
299 to->di_dmstate = cpu_to_be16(from->di_dmstate);
300 to->di_flags = cpu_to_be16(from->di_flags);
301
302 if (from->di_version == 3) {
303 to->di_changecount = cpu_to_be64(inode->i_version);
304 to->di_crtime.t_sec = cpu_to_be32(from->di_crtime.t_sec);
305 to->di_crtime.t_nsec = cpu_to_be32(from->di_crtime.t_nsec);
306 to->di_flags2 = cpu_to_be64(from->di_flags2);
307
308 to->di_ino = cpu_to_be64(ip->i_ino);
309 to->di_lsn = cpu_to_be64(lsn);
310 memset(to->di_pad2, 0, sizeof(to->di_pad2));
311 uuid_copy(&to->di_uuid, &ip->i_mount->m_sb.sb_meta_uuid);
312 to->di_flushiter = 0;
313 } else {
314 to->di_flushiter = cpu_to_be16(from->di_flushiter);
315 }
316}
317
318void
319xfs_log_dinode_to_disk(
320 struct xfs_log_dinode *from,
321 struct xfs_dinode *to)
322{
323 to->di_magic = cpu_to_be16(from->di_magic);
324 to->di_mode = cpu_to_be16(from->di_mode);
325 to->di_version = from->di_version;
326 to->di_format = from->di_format;
327 to->di_onlink = 0;
328 to->di_uid = cpu_to_be32(from->di_uid);
329 to->di_gid = cpu_to_be32(from->di_gid);
330 to->di_nlink = cpu_to_be32(from->di_nlink);
331 to->di_projid_lo = cpu_to_be16(from->di_projid_lo);
332 to->di_projid_hi = cpu_to_be16(from->di_projid_hi);
333 memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad));
334
335 to->di_atime.t_sec = cpu_to_be32(from->di_atime.t_sec);
336 to->di_atime.t_nsec = cpu_to_be32(from->di_atime.t_nsec);
337 to->di_mtime.t_sec = cpu_to_be32(from->di_mtime.t_sec);
338 to->di_mtime.t_nsec = cpu_to_be32(from->di_mtime.t_nsec);
339 to->di_ctime.t_sec = cpu_to_be32(from->di_ctime.t_sec);
340 to->di_ctime.t_nsec = cpu_to_be32(from->di_ctime.t_nsec);
341
342 to->di_size = cpu_to_be64(from->di_size);
343 to->di_nblocks = cpu_to_be64(from->di_nblocks);
344 to->di_extsize = cpu_to_be32(from->di_extsize);
345 to->di_nextents = cpu_to_be32(from->di_nextents);
346 to->di_anextents = cpu_to_be16(from->di_anextents);
347 to->di_forkoff = from->di_forkoff;
348 to->di_aformat = from->di_aformat;
349 to->di_dmevmask = cpu_to_be32(from->di_dmevmask);
350 to->di_dmstate = cpu_to_be16(from->di_dmstate);
351 to->di_flags = cpu_to_be16(from->di_flags);
352 to->di_gen = cpu_to_be32(from->di_gen);
353
354 if (from->di_version == 3) {
355 to->di_changecount = cpu_to_be64(from->di_changecount);
356 to->di_crtime.t_sec = cpu_to_be32(from->di_crtime.t_sec);
357 to->di_crtime.t_nsec = cpu_to_be32(from->di_crtime.t_nsec);
358 to->di_flags2 = cpu_to_be64(from->di_flags2);
359 to->di_ino = cpu_to_be64(from->di_ino);
360 to->di_lsn = cpu_to_be64(from->di_lsn);
361 memcpy(to->di_pad2, from->di_pad2, sizeof(to->di_pad2));
362 uuid_copy(&to->di_uuid, &from->di_uuid);
363 to->di_flushiter = 0;
364 } else {
365 to->di_flushiter = cpu_to_be16(from->di_flushiter);
366 }
367}
368
369static bool
370xfs_dinode_verify(
371 struct xfs_mount *mp,
372 struct xfs_inode *ip,
373 struct xfs_dinode *dip)
374{
375 if (dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC))
376 return false;
377
378 /* only version 3 or greater inodes are extensively verified here */
379 if (dip->di_version < 3)
380 return true;
381
382 if (!xfs_sb_version_hascrc(&mp->m_sb))
383 return false;
384 if (!xfs_verify_cksum((char *)dip, mp->m_sb.sb_inodesize,
385 XFS_DINODE_CRC_OFF))
386 return false;
387 if (be64_to_cpu(dip->di_ino) != ip->i_ino)
388 return false;
389 if (!uuid_equal(&dip->di_uuid, &mp->m_sb.sb_meta_uuid))
390 return false;
391 return true;
392}
393
394void
395xfs_dinode_calc_crc(
396 struct xfs_mount *mp,
397 struct xfs_dinode *dip)
398{
399 __uint32_t crc;
400
401 if (dip->di_version < 3)
402 return;
403
404 ASSERT(xfs_sb_version_hascrc(&mp->m_sb));
405 crc = xfs_start_cksum((char *)dip, mp->m_sb.sb_inodesize,
406 XFS_DINODE_CRC_OFF);
407 dip->di_crc = xfs_end_cksum(crc);
408}
409
410/*
411 * Read the disk inode attributes into the in-core inode structure.
412 *
413 * For version 5 superblocks, if we are initialising a new inode and we are not
414 * utilising the XFS_MOUNT_IKEEP inode cluster mode, we can simple build the new
415 * inode core with a random generation number. If we are keeping inodes around,
416 * we need to read the inode cluster to get the existing generation number off
417 * disk. Further, if we are using version 4 superblocks (i.e. v1/v2 inode
418 * format) then log recovery is dependent on the di_flushiter field being
419 * initialised from the current on-disk value and hence we must also read the
420 * inode off disk.
421 */
422int
423xfs_iread(
424 xfs_mount_t *mp,
425 xfs_trans_t *tp,
426 xfs_inode_t *ip,
427 uint iget_flags)
428{
429 xfs_buf_t *bp;
430 xfs_dinode_t *dip;
431 int error;
432
433 /*
434 * Fill in the location information in the in-core inode.
435 */
436 error = xfs_imap(mp, tp, ip->i_ino, &ip->i_imap, iget_flags);
437 if (error)
438 return error;
439
440 /* shortcut IO on inode allocation if possible */
441 if ((iget_flags & XFS_IGET_CREATE) &&
442 xfs_sb_version_hascrc(&mp->m_sb) &&
443 !(mp->m_flags & XFS_MOUNT_IKEEP)) {
444 /* initialise the on-disk inode core */
445 memset(&ip->i_d, 0, sizeof(ip->i_d));
446 VFS_I(ip)->i_generation = prandom_u32();
447 if (xfs_sb_version_hascrc(&mp->m_sb))
448 ip->i_d.di_version = 3;
449 else
450 ip->i_d.di_version = 2;
451 return 0;
452 }
453
454 /*
455 * Get pointers to the on-disk inode and the buffer containing it.
456 */
457 error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &bp, 0, iget_flags);
458 if (error)
459 return error;
460
461 /* even unallocated inodes are verified */
462 if (!xfs_dinode_verify(mp, ip, dip)) {
463 xfs_alert(mp, "%s: validation failed for inode %lld failed",
464 __func__, ip->i_ino);
465
466 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, dip);
467 error = -EFSCORRUPTED;
468 goto out_brelse;
469 }
470
471 /*
472 * If the on-disk inode is already linked to a directory
473 * entry, copy all of the inode into the in-core inode.
474 * xfs_iformat_fork() handles copying in the inode format
475 * specific information.
476 * Otherwise, just get the truly permanent information.
477 */
478 if (dip->di_mode) {
479 xfs_inode_from_disk(ip, dip);
480 error = xfs_iformat_fork(ip, dip);
481 if (error) {
482#ifdef DEBUG
483 xfs_alert(mp, "%s: xfs_iformat() returned error %d",
484 __func__, error);
485#endif /* DEBUG */
486 goto out_brelse;
487 }
488 } else {
489 /*
490 * Partial initialisation of the in-core inode. Just the bits
491 * that xfs_ialloc won't overwrite or relies on being correct.
492 */
493 ip->i_d.di_version = dip->di_version;
494 VFS_I(ip)->i_generation = be32_to_cpu(dip->di_gen);
495 ip->i_d.di_flushiter = be16_to_cpu(dip->di_flushiter);
496
497 /*
498 * Make sure to pull in the mode here as well in
499 * case the inode is released without being used.
500 * This ensures that xfs_inactive() will see that
501 * the inode is already free and not try to mess
502 * with the uninitialized part of it.
503 */
504 VFS_I(ip)->i_mode = 0;
505 }
506
507 ASSERT(ip->i_d.di_version >= 2);
508 ip->i_delayed_blks = 0;
509
510 /*
511 * Mark the buffer containing the inode as something to keep
512 * around for a while. This helps to keep recently accessed
513 * meta-data in-core longer.
514 */
515 xfs_buf_set_ref(bp, XFS_INO_REF);
516
517 /*
518 * Use xfs_trans_brelse() to release the buffer containing the on-disk
519 * inode, because it was acquired with xfs_trans_read_buf() in
520 * xfs_imap_to_bp() above. If tp is NULL, this is just a normal
521 * brelse(). If we're within a transaction, then xfs_trans_brelse()
522 * will only release the buffer if it is not dirty within the
523 * transaction. It will be OK to release the buffer in this case,
524 * because inodes on disk are never destroyed and we will be locking the
525 * new in-core inode before putting it in the cache where other
526 * processes can find it. Thus we don't have to worry about the inode
527 * being changed just because we released the buffer.
528 */
529 out_brelse:
530 xfs_trans_brelse(tp, bp);
531 return error;
532}