Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6#include "xfs_platform.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_bit.h"
13#include "xfs_sb.h"
14#include "xfs_mount.h"
15#include "xfs_ialloc.h"
16#include "xfs_alloc.h"
17#include "xfs_error.h"
18#include "xfs_trans.h"
19#include "xfs_buf_item.h"
20#include "xfs_bmap_btree.h"
21#include "xfs_alloc_btree.h"
22#include "xfs_log.h"
23#include "xfs_rmap_btree.h"
24#include "xfs_refcount_btree.h"
25#include "xfs_da_format.h"
26#include "xfs_health.h"
27#include "xfs_ag.h"
28#include "xfs_rtbitmap.h"
29#include "xfs_exchrange.h"
30#include "xfs_rtgroup.h"
31#include "xfs_rtrmap_btree.h"
32#include "xfs_rtrefcount_btree.h"
33
34/*
35 * Physical superblock buffer manipulations. Shared with libxfs in userspace.
36 */
37
38/*
39 * Check that all the V4 feature bits that the V5 filesystem format requires are
40 * correctly set.
41 */
42static bool
43xfs_sb_validate_v5_features(
44 struct xfs_sb *sbp)
45{
46 /* We must not have any unknown V4 feature bits set */
47 if (sbp->sb_versionnum & ~XFS_SB_VERSION_OKBITS)
48 return false;
49
50 /*
51 * The CRC bit is considered an invalid V4 flag, so we have to add it
52 * manually to the OKBITS mask.
53 */
54 if (sbp->sb_features2 & ~(XFS_SB_VERSION2_OKBITS |
55 XFS_SB_VERSION2_CRCBIT))
56 return false;
57
58 /* Now check all the required V4 feature flags are set. */
59
60#define V5_VERS_FLAGS (XFS_SB_VERSION_NLINKBIT | \
61 XFS_SB_VERSION_ALIGNBIT | \
62 XFS_SB_VERSION_LOGV2BIT | \
63 XFS_SB_VERSION_EXTFLGBIT | \
64 XFS_SB_VERSION_DIRV2BIT | \
65 XFS_SB_VERSION_MOREBITSBIT)
66
67#define V5_FEAT_FLAGS (XFS_SB_VERSION2_LAZYSBCOUNTBIT | \
68 XFS_SB_VERSION2_ATTR2BIT | \
69 XFS_SB_VERSION2_PROJID32BIT | \
70 XFS_SB_VERSION2_CRCBIT)
71
72 if ((sbp->sb_versionnum & V5_VERS_FLAGS) != V5_VERS_FLAGS)
73 return false;
74 if ((sbp->sb_features2 & V5_FEAT_FLAGS) != V5_FEAT_FLAGS)
75 return false;
76 return true;
77}
78
79/*
80 * We current support XFS v5 formats with known features and v4 superblocks with
81 * at least V2 directories.
82 */
83bool
84xfs_sb_good_version(
85 struct xfs_sb *sbp)
86{
87 /*
88 * All v5 filesystems are supported, but we must check that all the
89 * required v4 feature flags are enabled correctly as the code checks
90 * those flags and not for v5 support.
91 */
92 if (xfs_sb_is_v5(sbp))
93 return xfs_sb_validate_v5_features(sbp);
94
95 /* versions prior to v4 are not supported */
96 if (XFS_SB_VERSION_NUM(sbp) != XFS_SB_VERSION_4)
97 return false;
98
99 /* We must not have any unknown v4 feature bits set */
100 if ((sbp->sb_versionnum & ~XFS_SB_VERSION_OKBITS) ||
101 ((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) &&
102 (sbp->sb_features2 & ~XFS_SB_VERSION2_OKBITS)))
103 return false;
104
105 /* V4 filesystems need v2 directories and unwritten extents */
106 if (!(sbp->sb_versionnum & XFS_SB_VERSION_DIRV2BIT))
107 return false;
108 if (!(sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT))
109 return false;
110
111 /* It's a supported v4 filesystem */
112 return true;
113}
114
115uint64_t
116xfs_sb_version_to_features(
117 struct xfs_sb *sbp)
118{
119 uint64_t features = 0;
120
121 /* optional V4 features */
122 if (sbp->sb_rblocks > 0)
123 features |= XFS_FEAT_REALTIME;
124 if (sbp->sb_versionnum & XFS_SB_VERSION_NLINKBIT)
125 features |= XFS_FEAT_NLINK;
126 if (sbp->sb_versionnum & XFS_SB_VERSION_ATTRBIT)
127 features |= XFS_FEAT_ATTR;
128 if (sbp->sb_versionnum & XFS_SB_VERSION_QUOTABIT)
129 features |= XFS_FEAT_QUOTA;
130 if (sbp->sb_versionnum & XFS_SB_VERSION_ALIGNBIT)
131 features |= XFS_FEAT_ALIGN;
132 if (sbp->sb_versionnum & XFS_SB_VERSION_LOGV2BIT)
133 features |= XFS_FEAT_LOGV2;
134 if (sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT)
135 features |= XFS_FEAT_DALIGN;
136 if (sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT)
137 features |= XFS_FEAT_EXTFLG;
138 if (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT)
139 features |= XFS_FEAT_SECTOR;
140 if (sbp->sb_versionnum & XFS_SB_VERSION_BORGBIT)
141 features |= XFS_FEAT_ASCIICI;
142 if (sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) {
143 if (sbp->sb_features2 & XFS_SB_VERSION2_LAZYSBCOUNTBIT)
144 features |= XFS_FEAT_LAZYSBCOUNT;
145 if (sbp->sb_features2 & XFS_SB_VERSION2_PROJID32BIT)
146 features |= XFS_FEAT_PROJID32;
147 if (sbp->sb_features2 & XFS_SB_VERSION2_FTYPE)
148 features |= XFS_FEAT_FTYPE;
149 }
150
151 if (!xfs_sb_is_v5(sbp))
152 return features;
153
154 /* Always on V5 features */
155 features |= XFS_FEAT_ALIGN | XFS_FEAT_LOGV2 | XFS_FEAT_EXTFLG |
156 XFS_FEAT_LAZYSBCOUNT | XFS_FEAT_PROJID32 |
157 XFS_FEAT_V3INODES | XFS_FEAT_CRC | XFS_FEAT_PQUOTINO;
158
159 /* Optional V5 features */
160 if (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_FINOBT)
161 features |= XFS_FEAT_FINOBT;
162 if (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_RMAPBT)
163 features |= XFS_FEAT_RMAPBT;
164 if (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_REFLINK)
165 features |= XFS_FEAT_REFLINK;
166 if (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_INOBTCNT)
167 features |= XFS_FEAT_INOBTCNT;
168 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_FTYPE)
169 features |= XFS_FEAT_FTYPE;
170 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_SPINODES)
171 features |= XFS_FEAT_SPINODES;
172 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID)
173 features |= XFS_FEAT_META_UUID;
174 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_BIGTIME)
175 features |= XFS_FEAT_BIGTIME;
176 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR)
177 features |= XFS_FEAT_NEEDSREPAIR;
178 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_NREXT64)
179 features |= XFS_FEAT_NREXT64;
180 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_EXCHRANGE)
181 features |= XFS_FEAT_EXCHANGE_RANGE;
182 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_PARENT)
183 features |= XFS_FEAT_PARENT;
184 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_METADIR)
185 features |= XFS_FEAT_METADIR;
186 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_ZONED)
187 features |= XFS_FEAT_ZONED;
188
189 return features;
190}
191
192/* Check all the superblock fields we care about when reading one in. */
193STATIC int
194xfs_validate_sb_read(
195 struct xfs_mount *mp,
196 struct xfs_sb *sbp)
197{
198 if (!xfs_sb_is_v5(sbp))
199 return 0;
200
201 /*
202 * Version 5 superblock feature mask validation. Reject combinations
203 * the kernel cannot support up front before checking anything else.
204 */
205 if (xfs_sb_has_compat_feature(sbp, XFS_SB_FEAT_COMPAT_UNKNOWN)) {
206 xfs_warn(mp,
207"Superblock has unknown compatible features (0x%x) enabled.",
208 (sbp->sb_features_compat & XFS_SB_FEAT_COMPAT_UNKNOWN));
209 xfs_warn(mp,
210"Using a more recent kernel is recommended.");
211 }
212
213 if (xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
214 xfs_alert(mp,
215"Superblock has unknown read-only compatible features (0x%x) enabled.",
216 (sbp->sb_features_ro_compat &
217 XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
218 if (!xfs_is_readonly(mp)) {
219 xfs_warn(mp,
220"Attempted to mount read-only compatible filesystem read-write.");
221 xfs_warn(mp,
222"Filesystem can only be safely mounted read only.");
223
224 return -EINVAL;
225 }
226 }
227 if (xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_UNKNOWN)) {
228 xfs_warn(mp,
229"Superblock has unknown incompatible features (0x%x) enabled.",
230 (sbp->sb_features_incompat &
231 XFS_SB_FEAT_INCOMPAT_UNKNOWN));
232 xfs_warn(mp,
233"Filesystem cannot be safely mounted by this kernel.");
234 return -EINVAL;
235 }
236
237 return 0;
238}
239
240/* Return the number of extents covered by a single rt bitmap file */
241static xfs_rtbxlen_t
242xfs_extents_per_rbm(
243 struct xfs_sb *sbp)
244{
245 if (xfs_sb_is_v5(sbp) &&
246 (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_METADIR))
247 return sbp->sb_rgextents;
248 return sbp->sb_rextents;
249}
250
251/*
252 * Return the payload size of a single rt bitmap block (without the metadata
253 * header if any).
254 */
255static inline unsigned int
256xfs_rtbmblock_size(
257 struct xfs_sb *sbp)
258{
259 if (xfs_sb_is_v5(sbp) &&
260 (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_METADIR))
261 return sbp->sb_blocksize - sizeof(struct xfs_rtbuf_blkinfo);
262 return sbp->sb_blocksize;
263}
264
265static uint64_t
266xfs_expected_rbmblocks(
267 struct xfs_sb *sbp)
268{
269 if (xfs_sb_is_v5(sbp) &&
270 (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_ZONED))
271 return 0;
272 return howmany_64(xfs_extents_per_rbm(sbp),
273 NBBY * xfs_rtbmblock_size(sbp));
274}
275
276/* Validate the realtime geometry */
277bool
278xfs_validate_rt_geometry(
279 struct xfs_sb *sbp)
280{
281 if (xfs_sb_is_v5(sbp) &&
282 (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_ZONED)) {
283 if (sbp->sb_rextsize != 1)
284 return false;
285 } else {
286 if (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE ||
287 sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE)
288 return false;
289 }
290
291 if (sbp->sb_rblocks == 0) {
292 if (sbp->sb_rextents != 0 || sbp->sb_rbmblocks != 0 ||
293 sbp->sb_rextslog != 0 || sbp->sb_frextents != 0)
294 return false;
295 return true;
296 }
297
298 if (sbp->sb_rextents == 0 ||
299 sbp->sb_rextents != div_u64(sbp->sb_rblocks, sbp->sb_rextsize) ||
300 sbp->sb_rextslog != xfs_compute_rextslog(sbp->sb_rextents) ||
301 sbp->sb_rbmblocks != xfs_expected_rbmblocks(sbp))
302 return false;
303
304 if (xfs_sb_is_v5(sbp) &&
305 (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_ZONED)) {
306 uint32_t mod;
307
308 /*
309 * Zoned RT devices must be aligned to the RT group size,
310 * because garbage collection assumes that all zones have the
311 * same size to avoid insane complexity if that weren't the
312 * case.
313 */
314 div_u64_rem(sbp->sb_rextents, sbp->sb_rgextents, &mod);
315 if (mod)
316 return false;
317 }
318
319 return true;
320}
321
322/* Check all the superblock fields we care about when writing one out. */
323STATIC int
324xfs_validate_sb_write(
325 struct xfs_mount *mp,
326 struct xfs_buf *bp,
327 struct xfs_sb *sbp)
328{
329 /*
330 * Carry out additional sb summary counter sanity checks when we write
331 * the superblock. We skip this in the read validator because there
332 * could be newer superblocks in the log and if the values are garbage
333 * even after replay we'll recalculate them at the end of log mount.
334 *
335 * mkfs has traditionally written zeroed counters to inprogress and
336 * secondary superblocks, so allow this usage to continue because
337 * we never read counters from such superblocks.
338 */
339 if (xfs_buf_daddr(bp) == XFS_SB_DADDR && !sbp->sb_inprogress &&
340 (sbp->sb_fdblocks > sbp->sb_dblocks ||
341 !xfs_verify_icount(mp, sbp->sb_icount) ||
342 sbp->sb_ifree > sbp->sb_icount)) {
343 xfs_warn(mp, "SB summary counter sanity check failed");
344 return -EFSCORRUPTED;
345 }
346
347 if (!xfs_sb_is_v5(sbp))
348 return 0;
349
350 /*
351 * Version 5 superblock feature mask validation. Reject combinations
352 * the kernel cannot support since we checked for unsupported bits in
353 * the read verifier, which means that memory is corrupt.
354 */
355 if (!xfs_is_readonly(mp) &&
356 xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
357 xfs_alert(mp,
358"Corruption detected in superblock read-only compatible features (0x%x)!",
359 (sbp->sb_features_ro_compat &
360 XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
361 return -EFSCORRUPTED;
362 }
363 if (xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_UNKNOWN)) {
364 xfs_warn(mp,
365"Corruption detected in superblock incompatible features (0x%x)!",
366 (sbp->sb_features_incompat &
367 XFS_SB_FEAT_INCOMPAT_UNKNOWN));
368 return -EFSCORRUPTED;
369 }
370 if (xfs_sb_has_incompat_log_feature(sbp,
371 XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN)) {
372 xfs_warn(mp,
373"Corruption detected in superblock incompatible log features (0x%x)!",
374 (sbp->sb_features_log_incompat &
375 XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN));
376 return -EFSCORRUPTED;
377 }
378
379 /*
380 * We can't read verify the sb LSN because the read verifier is called
381 * before the log is allocated and processed. We know the log is set up
382 * before write verifier calls, so check it here.
383 */
384 if (!xfs_log_check_lsn(mp, sbp->sb_lsn))
385 return -EFSCORRUPTED;
386
387 return 0;
388}
389
390int
391xfs_compute_rgblklog(
392 xfs_rtxlen_t rgextents,
393 xfs_rgblock_t rextsize)
394{
395 uint64_t rgblocks = (uint64_t)rgextents * rextsize;
396
397 return xfs_highbit64(rgblocks - 1) + 1;
398}
399
400static int
401xfs_validate_sb_rtgroups(
402 struct xfs_mount *mp,
403 struct xfs_sb *sbp)
404{
405 uint64_t groups;
406 int rgblklog;
407
408 if (sbp->sb_rextsize == 0) {
409 xfs_warn(mp,
410"Realtime extent size must not be zero.");
411 return -EINVAL;
412 }
413
414 if (sbp->sb_rgextents > XFS_MAX_RGBLOCKS / sbp->sb_rextsize) {
415 xfs_warn(mp,
416"Realtime group size (%u) must be less than %u rt extents.",
417 sbp->sb_rgextents,
418 XFS_MAX_RGBLOCKS / sbp->sb_rextsize);
419 return -EINVAL;
420 }
421
422 if (sbp->sb_rgextents < XFS_MIN_RGEXTENTS) {
423 xfs_warn(mp,
424"Realtime group size (%u) must be at least %u rt extents.",
425 sbp->sb_rgextents, XFS_MIN_RGEXTENTS);
426 return -EINVAL;
427 }
428
429 if (sbp->sb_rgcount > XFS_MAX_RGNUMBER) {
430 xfs_warn(mp,
431"Realtime groups (%u) must be less than %u.",
432 sbp->sb_rgcount, XFS_MAX_RGNUMBER);
433 return -EINVAL;
434 }
435
436 groups = howmany_64(sbp->sb_rextents, sbp->sb_rgextents);
437 if (groups != sbp->sb_rgcount) {
438 xfs_warn(mp,
439"Realtime groups (%u) do not cover the entire rt section; need (%llu) groups.",
440 sbp->sb_rgcount, groups);
441 return -EINVAL;
442 }
443
444 /* Exchange-range is required for fsr to work on realtime files */
445 if (!(sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_EXCHRANGE)) {
446 xfs_warn(mp,
447"Realtime groups feature requires exchange-range support.");
448 return -EINVAL;
449 }
450
451 rgblklog = xfs_compute_rgblklog(sbp->sb_rgextents, sbp->sb_rextsize);
452 if (sbp->sb_rgblklog != rgblklog) {
453 xfs_warn(mp,
454"Realtime group log (%d) does not match expected value (%d).",
455 sbp->sb_rgblklog, rgblklog);
456 return -EINVAL;
457 }
458
459 return 0;
460}
461
462static int
463xfs_validate_sb_zoned(
464 struct xfs_mount *mp,
465 struct xfs_sb *sbp)
466{
467 if (sbp->sb_frextents != 0) {
468 xfs_warn(mp,
469"sb_frextents must be zero for zoned file systems.");
470 return -EINVAL;
471 }
472
473 if (sbp->sb_rtstart && sbp->sb_rtstart < sbp->sb_dblocks) {
474 xfs_warn(mp,
475"sb_rtstart (%lld) overlaps sb_dblocks (%lld).",
476 sbp->sb_rtstart, sbp->sb_dblocks);
477 return -EINVAL;
478 }
479
480 if (sbp->sb_rtreserved && sbp->sb_rtreserved >= sbp->sb_rblocks) {
481 xfs_warn(mp,
482"sb_rtreserved (%lld) larger than sb_rblocks (%lld).",
483 sbp->sb_rtreserved, sbp->sb_rblocks);
484 return -EINVAL;
485 }
486
487 return 0;
488}
489
490/* Check the validity of the SB. */
491STATIC int
492xfs_validate_sb_common(
493 struct xfs_mount *mp,
494 struct xfs_buf *bp,
495 struct xfs_sb *sbp)
496{
497 struct xfs_dsb *dsb = bp->b_addr;
498 uint32_t agcount = 0;
499 uint32_t rem;
500 bool has_dalign;
501 int error;
502
503 if (!xfs_verify_magic(bp, dsb->sb_magicnum)) {
504 xfs_warn(mp,
505"Superblock has bad magic number 0x%x. Not an XFS filesystem?",
506 be32_to_cpu(dsb->sb_magicnum));
507 return -EWRONGFS;
508 }
509
510 if (!xfs_sb_good_version(sbp)) {
511 xfs_warn(mp,
512"Superblock has unknown features enabled or corrupted feature masks.");
513 return -EWRONGFS;
514 }
515
516 /*
517 * Validate feature flags and state
518 */
519 if (xfs_sb_is_v5(sbp)) {
520 if (sbp->sb_blocksize < XFS_MIN_CRC_BLOCKSIZE) {
521 xfs_notice(mp,
522"Block size (%u bytes) too small for Version 5 superblock (minimum %d bytes)",
523 sbp->sb_blocksize, XFS_MIN_CRC_BLOCKSIZE);
524 return -EFSCORRUPTED;
525 }
526
527 /* V5 has a separate project quota inode */
528 if (sbp->sb_qflags & (XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD)) {
529 xfs_notice(mp,
530 "Version 5 of Super block has XFS_OQUOTA bits.");
531 return -EFSCORRUPTED;
532 }
533
534 /*
535 * Full inode chunks must be aligned to inode chunk size when
536 * sparse inodes are enabled to support the sparse chunk
537 * allocation algorithm and prevent overlapping inode records.
538 */
539 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_SPINODES) {
540 uint32_t align;
541
542 align = XFS_INODES_PER_CHUNK * sbp->sb_inodesize
543 >> sbp->sb_blocklog;
544 if (sbp->sb_inoalignmt != align) {
545 xfs_warn(mp,
546"Inode block alignment (%u) must match chunk size (%u) for sparse inodes.",
547 sbp->sb_inoalignmt, align);
548 return -EINVAL;
549 }
550
551 if (sbp->sb_spino_align &&
552 (sbp->sb_spino_align > sbp->sb_inoalignmt ||
553 (sbp->sb_inoalignmt % sbp->sb_spino_align) != 0)) {
554 xfs_warn(mp,
555"Sparse inode alignment (%u) is invalid, must be integer factor of (%u).",
556 sbp->sb_spino_align,
557 sbp->sb_inoalignmt);
558 return -EINVAL;
559 }
560 } else if (sbp->sb_spino_align) {
561 xfs_warn(mp,
562 "Sparse inode alignment (%u) should be zero.",
563 sbp->sb_spino_align);
564 return -EINVAL;
565 }
566
567 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_METADIR) {
568 if (memchr_inv(sbp->sb_pad, 0, sizeof(sbp->sb_pad))) {
569 xfs_warn(mp,
570"Metadir superblock padding fields must be zero.");
571 return -EINVAL;
572 }
573
574 error = xfs_validate_sb_rtgroups(mp, sbp);
575 if (error)
576 return error;
577 }
578 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_ZONED) {
579 error = xfs_validate_sb_zoned(mp, sbp);
580 if (error)
581 return error;
582 }
583 } else if (sbp->sb_qflags & (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD |
584 XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD)) {
585 xfs_notice(mp,
586"Superblock earlier than Version 5 has XFS_{P|G}QUOTA_{ENFD|CHKD} bits.");
587 return -EFSCORRUPTED;
588 }
589
590 if (unlikely(
591 sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) {
592 xfs_warn(mp,
593 "filesystem is marked as having an external log; "
594 "specify logdev on the mount command line.");
595 return -EINVAL;
596 }
597
598 if (unlikely(
599 sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) {
600 xfs_warn(mp,
601 "filesystem is marked as having an internal log; "
602 "do not specify logdev on the mount command line.");
603 return -EINVAL;
604 }
605
606 /* Compute agcount for this number of dblocks and agblocks */
607 if (sbp->sb_agblocks) {
608 agcount = div_u64_rem(sbp->sb_dblocks, sbp->sb_agblocks, &rem);
609 if (rem)
610 agcount++;
611 }
612
613 /*
614 * More sanity checking. Most of these were stolen directly from
615 * xfs_repair.
616 */
617 if (unlikely(
618 sbp->sb_agcount <= 0 ||
619 sbp->sb_sectsize < XFS_MIN_SECTORSIZE ||
620 sbp->sb_sectsize > XFS_MAX_SECTORSIZE ||
621 sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG ||
622 sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG ||
623 sbp->sb_sectsize != (1 << sbp->sb_sectlog) ||
624 sbp->sb_blocksize < XFS_MIN_BLOCKSIZE ||
625 sbp->sb_blocksize > XFS_MAX_BLOCKSIZE ||
626 sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG ||
627 sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG ||
628 sbp->sb_blocksize != (1 << sbp->sb_blocklog) ||
629 sbp->sb_dirblklog + sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG ||
630 sbp->sb_inodesize < XFS_DINODE_MIN_SIZE ||
631 sbp->sb_inodesize > XFS_DINODE_MAX_SIZE ||
632 sbp->sb_inodelog < XFS_DINODE_MIN_LOG ||
633 sbp->sb_inodelog > XFS_DINODE_MAX_LOG ||
634 sbp->sb_inodesize != (1 << sbp->sb_inodelog) ||
635 sbp->sb_inopblock != howmany(sbp->sb_blocksize,sbp->sb_inodesize) ||
636 XFS_FSB_TO_B(mp, sbp->sb_agblocks) < XFS_MIN_AG_BYTES ||
637 XFS_FSB_TO_B(mp, sbp->sb_agblocks) > XFS_MAX_AG_BYTES ||
638 sbp->sb_agblklog != xfs_highbit32(sbp->sb_agblocks - 1) + 1 ||
639 agcount == 0 || agcount != sbp->sb_agcount ||
640 (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) ||
641 (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) ||
642 (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) ||
643 (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */) ||
644 sbp->sb_dblocks == 0 ||
645 sbp->sb_dblocks > XFS_MAX_DBLOCKS(sbp) ||
646 sbp->sb_dblocks < XFS_MIN_DBLOCKS(sbp) ||
647 sbp->sb_shared_vn != 0)) {
648 xfs_notice(mp, "SB sanity check failed");
649 return -EFSCORRUPTED;
650 }
651
652 /*
653 * Logs that are too large are not supported at all. Reject them
654 * outright. Logs that are too small are tolerated on v4 filesystems,
655 * but we can only check that when mounting the log. Hence we skip
656 * those checks here.
657 */
658 if (sbp->sb_logblocks > XFS_MAX_LOG_BLOCKS) {
659 xfs_notice(mp,
660 "Log size 0x%x blocks too large, maximum size is 0x%llx blocks",
661 sbp->sb_logblocks, XFS_MAX_LOG_BLOCKS);
662 return -EFSCORRUPTED;
663 }
664
665 if (XFS_FSB_TO_B(mp, sbp->sb_logblocks) > XFS_MAX_LOG_BYTES) {
666 xfs_warn(mp,
667 "log size 0x%llx bytes too large, maximum size is 0x%llx bytes",
668 XFS_FSB_TO_B(mp, sbp->sb_logblocks),
669 XFS_MAX_LOG_BYTES);
670 return -EFSCORRUPTED;
671 }
672
673 /*
674 * Do not allow filesystems with corrupted log sector or stripe units to
675 * be mounted. We cannot safely size the iclogs or write to the log if
676 * the log stripe unit is not valid.
677 */
678 if (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT) {
679 if (sbp->sb_logsectsize != (1U << sbp->sb_logsectlog)) {
680 xfs_notice(mp,
681 "log sector size in bytes/log2 (0x%x/0x%x) must match",
682 sbp->sb_logsectsize, 1U << sbp->sb_logsectlog);
683 return -EFSCORRUPTED;
684 }
685 } else if (sbp->sb_logsectsize || sbp->sb_logsectlog) {
686 xfs_notice(mp,
687 "log sector size in bytes/log2 (0x%x/0x%x) are not zero",
688 sbp->sb_logsectsize, sbp->sb_logsectlog);
689 return -EFSCORRUPTED;
690 }
691
692 if (sbp->sb_logsunit > 1) {
693 if (sbp->sb_logsunit % sbp->sb_blocksize) {
694 xfs_notice(mp,
695 "log stripe unit 0x%x bytes must be a multiple of block size",
696 sbp->sb_logsunit);
697 return -EFSCORRUPTED;
698 }
699 if (sbp->sb_logsunit > XLOG_MAX_RECORD_BSIZE) {
700 xfs_notice(mp,
701 "log stripe unit 0x%x bytes over maximum size (0x%x bytes)",
702 sbp->sb_logsunit, XLOG_MAX_RECORD_BSIZE);
703 return -EFSCORRUPTED;
704 }
705 }
706
707 if (!xfs_validate_rt_geometry(sbp)) {
708 xfs_notice(mp,
709 "realtime %sgeometry check failed",
710 sbp->sb_rblocks ? "" : "zeroed ");
711 return -EFSCORRUPTED;
712 }
713
714 /*
715 * Either (sb_unit and !hasdalign) or (!sb_unit and hasdalign)
716 * would imply the image is corrupted.
717 */
718 has_dalign = sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT;
719 if (!!sbp->sb_unit ^ has_dalign) {
720 xfs_notice(mp, "SB stripe alignment sanity check failed");
721 return -EFSCORRUPTED;
722 }
723
724 if (!xfs_validate_stripe_geometry(mp, XFS_FSB_TO_B(mp, sbp->sb_unit),
725 XFS_FSB_TO_B(mp, sbp->sb_width), 0,
726 xfs_buf_daddr(bp) == XFS_SB_DADDR, false))
727 return -EFSCORRUPTED;
728
729 /*
730 * Currently only very few inode sizes are supported.
731 */
732 switch (sbp->sb_inodesize) {
733 case 256:
734 case 512:
735 case 1024:
736 case 2048:
737 break;
738 default:
739 xfs_warn(mp, "inode size of %d bytes not supported",
740 sbp->sb_inodesize);
741 return -ENOSYS;
742 }
743
744 return 0;
745}
746
747void
748xfs_sb_quota_from_disk(struct xfs_sb *sbp)
749{
750 if (xfs_sb_is_v5(sbp) &&
751 (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_METADIR)) {
752 sbp->sb_uquotino = NULLFSINO;
753 sbp->sb_gquotino = NULLFSINO;
754 sbp->sb_pquotino = NULLFSINO;
755 return;
756 }
757
758 /*
759 * older mkfs doesn't initialize quota inodes to NULLFSINO. This
760 * leads to in-core values having two different values for a quota
761 * inode to be invalid: 0 and NULLFSINO. Change it to a single value
762 * NULLFSINO.
763 *
764 * Note that this change affect only the in-core values. These
765 * values are not written back to disk unless any quota information
766 * is written to the disk. Even in that case, sb_pquotino field is
767 * not written to disk unless the superblock supports pquotino.
768 */
769 if (sbp->sb_uquotino == 0)
770 sbp->sb_uquotino = NULLFSINO;
771 if (sbp->sb_gquotino == 0)
772 sbp->sb_gquotino = NULLFSINO;
773 if (sbp->sb_pquotino == 0)
774 sbp->sb_pquotino = NULLFSINO;
775
776 /*
777 * We need to do these manipilations only if we are working
778 * with an older version of on-disk superblock.
779 */
780 if (xfs_sb_is_v5(sbp))
781 return;
782
783 if (sbp->sb_qflags & XFS_OQUOTA_ENFD)
784 sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ?
785 XFS_PQUOTA_ENFD : XFS_GQUOTA_ENFD;
786 if (sbp->sb_qflags & XFS_OQUOTA_CHKD)
787 sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ?
788 XFS_PQUOTA_CHKD : XFS_GQUOTA_CHKD;
789 sbp->sb_qflags &= ~(XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD);
790
791 if (sbp->sb_qflags & XFS_PQUOTA_ACCT &&
792 sbp->sb_gquotino != NULLFSINO) {
793 /*
794 * In older version of superblock, on-disk superblock only
795 * has sb_gquotino, and in-core superblock has both sb_gquotino
796 * and sb_pquotino. But, only one of them is supported at any
797 * point of time. So, if PQUOTA is set in disk superblock,
798 * copy over sb_gquotino to sb_pquotino. The NULLFSINO test
799 * above is to make sure we don't do this twice and wipe them
800 * both out!
801 */
802 sbp->sb_pquotino = sbp->sb_gquotino;
803 sbp->sb_gquotino = NULLFSINO;
804 }
805}
806
807static void
808__xfs_sb_from_disk(
809 struct xfs_sb *to,
810 struct xfs_dsb *from,
811 bool convert_xquota)
812{
813 to->sb_magicnum = be32_to_cpu(from->sb_magicnum);
814 to->sb_blocksize = be32_to_cpu(from->sb_blocksize);
815 to->sb_dblocks = be64_to_cpu(from->sb_dblocks);
816 to->sb_rblocks = be64_to_cpu(from->sb_rblocks);
817 to->sb_rextents = be64_to_cpu(from->sb_rextents);
818 memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid));
819 to->sb_logstart = be64_to_cpu(from->sb_logstart);
820 to->sb_rootino = be64_to_cpu(from->sb_rootino);
821 to->sb_rbmino = be64_to_cpu(from->sb_rbmino);
822 to->sb_rsumino = be64_to_cpu(from->sb_rsumino);
823 to->sb_rextsize = be32_to_cpu(from->sb_rextsize);
824 to->sb_agblocks = be32_to_cpu(from->sb_agblocks);
825 to->sb_agcount = be32_to_cpu(from->sb_agcount);
826 to->sb_rbmblocks = be32_to_cpu(from->sb_rbmblocks);
827 to->sb_logblocks = be32_to_cpu(from->sb_logblocks);
828 to->sb_versionnum = be16_to_cpu(from->sb_versionnum);
829 to->sb_sectsize = be16_to_cpu(from->sb_sectsize);
830 to->sb_inodesize = be16_to_cpu(from->sb_inodesize);
831 to->sb_inopblock = be16_to_cpu(from->sb_inopblock);
832 memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname));
833 to->sb_blocklog = from->sb_blocklog;
834 to->sb_sectlog = from->sb_sectlog;
835 to->sb_inodelog = from->sb_inodelog;
836 to->sb_inopblog = from->sb_inopblog;
837 to->sb_agblklog = from->sb_agblklog;
838 to->sb_rextslog = from->sb_rextslog;
839 to->sb_inprogress = from->sb_inprogress;
840 to->sb_imax_pct = from->sb_imax_pct;
841 to->sb_icount = be64_to_cpu(from->sb_icount);
842 to->sb_ifree = be64_to_cpu(from->sb_ifree);
843 to->sb_fdblocks = be64_to_cpu(from->sb_fdblocks);
844 to->sb_frextents = be64_to_cpu(from->sb_frextents);
845 to->sb_uquotino = be64_to_cpu(from->sb_uquotino);
846 to->sb_gquotino = be64_to_cpu(from->sb_gquotino);
847 to->sb_qflags = be16_to_cpu(from->sb_qflags);
848 to->sb_flags = from->sb_flags;
849 to->sb_shared_vn = from->sb_shared_vn;
850 to->sb_inoalignmt = be32_to_cpu(from->sb_inoalignmt);
851 to->sb_unit = be32_to_cpu(from->sb_unit);
852 to->sb_width = be32_to_cpu(from->sb_width);
853 to->sb_dirblklog = from->sb_dirblklog;
854 to->sb_logsectlog = from->sb_logsectlog;
855 to->sb_logsectsize = be16_to_cpu(from->sb_logsectsize);
856 to->sb_logsunit = be32_to_cpu(from->sb_logsunit);
857 to->sb_features2 = be32_to_cpu(from->sb_features2);
858 to->sb_bad_features2 = be32_to_cpu(from->sb_bad_features2);
859 to->sb_features_compat = be32_to_cpu(from->sb_features_compat);
860 to->sb_features_ro_compat = be32_to_cpu(from->sb_features_ro_compat);
861 to->sb_features_incompat = be32_to_cpu(from->sb_features_incompat);
862 to->sb_features_log_incompat =
863 be32_to_cpu(from->sb_features_log_incompat);
864 /* crc is only used on disk, not in memory; just init to 0 here. */
865 to->sb_crc = 0;
866 to->sb_spino_align = be32_to_cpu(from->sb_spino_align);
867 to->sb_pquotino = be64_to_cpu(from->sb_pquotino);
868 to->sb_lsn = be64_to_cpu(from->sb_lsn);
869 /*
870 * sb_meta_uuid is only on disk if it differs from sb_uuid and the
871 * feature flag is set; if not set we keep it only in memory.
872 */
873 if (xfs_sb_is_v5(to) &&
874 (to->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID))
875 uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid);
876 else
877 uuid_copy(&to->sb_meta_uuid, &from->sb_uuid);
878 /* Convert on-disk flags to in-memory flags? */
879 if (convert_xquota)
880 xfs_sb_quota_from_disk(to);
881
882 if (to->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_METADIR) {
883 to->sb_metadirino = be64_to_cpu(from->sb_metadirino);
884 to->sb_rgblklog = from->sb_rgblklog;
885 memcpy(to->sb_pad, from->sb_pad, sizeof(to->sb_pad));
886 to->sb_rgcount = be32_to_cpu(from->sb_rgcount);
887 to->sb_rgextents = be32_to_cpu(from->sb_rgextents);
888 to->sb_rbmino = NULLFSINO;
889 to->sb_rsumino = NULLFSINO;
890 } else {
891 to->sb_metadirino = NULLFSINO;
892 to->sb_rgcount = 1;
893 to->sb_rgextents = 0;
894 }
895
896 if (to->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_ZONED) {
897 to->sb_rtstart = be64_to_cpu(from->sb_rtstart);
898 to->sb_rtreserved = be64_to_cpu(from->sb_rtreserved);
899 } else {
900 to->sb_rtstart = 0;
901 to->sb_rtreserved = 0;
902 }
903}
904
905void
906xfs_sb_from_disk(
907 struct xfs_sb *to,
908 struct xfs_dsb *from)
909{
910 __xfs_sb_from_disk(to, from, true);
911}
912
913static void
914xfs_sb_quota_to_disk(
915 struct xfs_dsb *to,
916 struct xfs_sb *from)
917{
918 uint16_t qflags = from->sb_qflags;
919
920 if (xfs_sb_is_v5(from) &&
921 (from->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_METADIR)) {
922 to->sb_qflags = cpu_to_be16(from->sb_qflags);
923 to->sb_uquotino = cpu_to_be64(0);
924 to->sb_gquotino = cpu_to_be64(0);
925 to->sb_pquotino = cpu_to_be64(0);
926 return;
927 }
928
929 to->sb_uquotino = cpu_to_be64(from->sb_uquotino);
930
931 /*
932 * The in-memory superblock quota state matches the v5 on-disk format so
933 * just write them out and return
934 */
935 if (xfs_sb_is_v5(from)) {
936 to->sb_qflags = cpu_to_be16(from->sb_qflags);
937 to->sb_gquotino = cpu_to_be64(from->sb_gquotino);
938 to->sb_pquotino = cpu_to_be64(from->sb_pquotino);
939 return;
940 }
941
942 /*
943 * For older superblocks (v4), the in-core version of sb_qflags do not
944 * have XFS_OQUOTA_* flags, whereas the on-disk version does. So,
945 * convert incore XFS_{PG}QUOTA_* flags to on-disk XFS_OQUOTA_* flags.
946 */
947 qflags &= ~(XFS_PQUOTA_ENFD | XFS_PQUOTA_CHKD |
948 XFS_GQUOTA_ENFD | XFS_GQUOTA_CHKD);
949
950 if (from->sb_qflags &
951 (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD))
952 qflags |= XFS_OQUOTA_ENFD;
953 if (from->sb_qflags &
954 (XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD))
955 qflags |= XFS_OQUOTA_CHKD;
956 to->sb_qflags = cpu_to_be16(qflags);
957
958 /*
959 * GQUOTINO and PQUOTINO cannot be used together in versions
960 * of superblock that do not have pquotino. from->sb_flags
961 * tells us which quota is active and should be copied to
962 * disk. If neither are active, we should NULL the inode.
963 *
964 * In all cases, the separate pquotino must remain 0 because it
965 * is beyond the "end" of the valid non-pquotino superblock.
966 */
967 if (from->sb_qflags & XFS_GQUOTA_ACCT)
968 to->sb_gquotino = cpu_to_be64(from->sb_gquotino);
969 else if (from->sb_qflags & XFS_PQUOTA_ACCT)
970 to->sb_gquotino = cpu_to_be64(from->sb_pquotino);
971 else {
972 /*
973 * We can't rely on just the fields being logged to tell us
974 * that it is safe to write NULLFSINO - we should only do that
975 * if quotas are not actually enabled. Hence only write
976 * NULLFSINO if both in-core quota inodes are NULL.
977 */
978 if (from->sb_gquotino == NULLFSINO &&
979 from->sb_pquotino == NULLFSINO)
980 to->sb_gquotino = cpu_to_be64(NULLFSINO);
981 }
982
983 to->sb_pquotino = 0;
984}
985
986void
987xfs_sb_to_disk(
988 struct xfs_dsb *to,
989 struct xfs_sb *from)
990{
991 xfs_sb_quota_to_disk(to, from);
992
993 to->sb_magicnum = cpu_to_be32(from->sb_magicnum);
994 to->sb_blocksize = cpu_to_be32(from->sb_blocksize);
995 to->sb_dblocks = cpu_to_be64(from->sb_dblocks);
996 to->sb_rblocks = cpu_to_be64(from->sb_rblocks);
997 to->sb_rextents = cpu_to_be64(from->sb_rextents);
998 memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid));
999 to->sb_logstart = cpu_to_be64(from->sb_logstart);
1000 to->sb_rootino = cpu_to_be64(from->sb_rootino);
1001 to->sb_rbmino = cpu_to_be64(from->sb_rbmino);
1002 to->sb_rsumino = cpu_to_be64(from->sb_rsumino);
1003 to->sb_rextsize = cpu_to_be32(from->sb_rextsize);
1004 to->sb_agblocks = cpu_to_be32(from->sb_agblocks);
1005 to->sb_agcount = cpu_to_be32(from->sb_agcount);
1006 to->sb_rbmblocks = cpu_to_be32(from->sb_rbmblocks);
1007 to->sb_logblocks = cpu_to_be32(from->sb_logblocks);
1008 to->sb_versionnum = cpu_to_be16(from->sb_versionnum);
1009 to->sb_sectsize = cpu_to_be16(from->sb_sectsize);
1010 to->sb_inodesize = cpu_to_be16(from->sb_inodesize);
1011 to->sb_inopblock = cpu_to_be16(from->sb_inopblock);
1012 memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname));
1013 to->sb_blocklog = from->sb_blocklog;
1014 to->sb_sectlog = from->sb_sectlog;
1015 to->sb_inodelog = from->sb_inodelog;
1016 to->sb_inopblog = from->sb_inopblog;
1017 to->sb_agblklog = from->sb_agblklog;
1018 to->sb_rextslog = from->sb_rextslog;
1019 to->sb_inprogress = from->sb_inprogress;
1020 to->sb_imax_pct = from->sb_imax_pct;
1021 to->sb_icount = cpu_to_be64(from->sb_icount);
1022 to->sb_ifree = cpu_to_be64(from->sb_ifree);
1023 to->sb_fdblocks = cpu_to_be64(from->sb_fdblocks);
1024 to->sb_frextents = cpu_to_be64(from->sb_frextents);
1025
1026 to->sb_flags = from->sb_flags;
1027 to->sb_shared_vn = from->sb_shared_vn;
1028 to->sb_inoalignmt = cpu_to_be32(from->sb_inoalignmt);
1029 to->sb_unit = cpu_to_be32(from->sb_unit);
1030 to->sb_width = cpu_to_be32(from->sb_width);
1031 to->sb_dirblklog = from->sb_dirblklog;
1032 to->sb_logsectlog = from->sb_logsectlog;
1033 to->sb_logsectsize = cpu_to_be16(from->sb_logsectsize);
1034 to->sb_logsunit = cpu_to_be32(from->sb_logsunit);
1035
1036 /*
1037 * We need to ensure that bad_features2 always matches features2.
1038 * Hence we enforce that here rather than having to remember to do it
1039 * everywhere else that updates features2.
1040 */
1041 from->sb_bad_features2 = from->sb_features2;
1042 to->sb_features2 = cpu_to_be32(from->sb_features2);
1043 to->sb_bad_features2 = cpu_to_be32(from->sb_bad_features2);
1044
1045 if (!xfs_sb_is_v5(from))
1046 return;
1047
1048 to->sb_features_compat = cpu_to_be32(from->sb_features_compat);
1049 to->sb_features_ro_compat =
1050 cpu_to_be32(from->sb_features_ro_compat);
1051 to->sb_features_incompat =
1052 cpu_to_be32(from->sb_features_incompat);
1053 to->sb_features_log_incompat =
1054 cpu_to_be32(from->sb_features_log_incompat);
1055 to->sb_spino_align = cpu_to_be32(from->sb_spino_align);
1056 to->sb_lsn = cpu_to_be64(from->sb_lsn);
1057 if (from->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID)
1058 uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid);
1059
1060 if (from->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_METADIR) {
1061 to->sb_metadirino = cpu_to_be64(from->sb_metadirino);
1062 to->sb_rgblklog = from->sb_rgblklog;
1063 memset(to->sb_pad, 0, sizeof(to->sb_pad));
1064 to->sb_rgcount = cpu_to_be32(from->sb_rgcount);
1065 to->sb_rgextents = cpu_to_be32(from->sb_rgextents);
1066 to->sb_rbmino = cpu_to_be64(0);
1067 to->sb_rsumino = cpu_to_be64(0);
1068 }
1069
1070 if (from->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_ZONED) {
1071 to->sb_rtstart = cpu_to_be64(from->sb_rtstart);
1072 to->sb_rtreserved = cpu_to_be64(from->sb_rtreserved);
1073 }
1074}
1075
1076/*
1077 * If the superblock has the CRC feature bit set or the CRC field is non-null,
1078 * check that the CRC is valid. We check the CRC field is non-null because a
1079 * single bit error could clear the feature bit and unused parts of the
1080 * superblock are supposed to be zero. Hence a non-null crc field indicates that
1081 * we've potentially lost a feature bit and we should check it anyway.
1082 *
1083 * However, past bugs (i.e. in growfs) left non-zeroed regions beyond the
1084 * last field in V4 secondary superblocks. So for secondary superblocks,
1085 * we are more forgiving, and ignore CRC failures if the primary doesn't
1086 * indicate that the fs version is V5.
1087 */
1088static void
1089xfs_sb_read_verify(
1090 struct xfs_buf *bp)
1091{
1092 struct xfs_sb sb;
1093 struct xfs_mount *mp = bp->b_mount;
1094 struct xfs_dsb *dsb = bp->b_addr;
1095 int error;
1096
1097 /*
1098 * open code the version check to avoid needing to convert the entire
1099 * superblock from disk order just to check the version number
1100 */
1101 if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC) &&
1102 (((be16_to_cpu(dsb->sb_versionnum) & XFS_SB_VERSION_NUMBITS) ==
1103 XFS_SB_VERSION_5) ||
1104 dsb->sb_crc != 0)) {
1105
1106 if (!xfs_buf_verify_cksum(bp, XFS_SB_CRC_OFF)) {
1107 /* Only fail bad secondaries on a known V5 filesystem */
1108 if (xfs_buf_daddr(bp) == XFS_SB_DADDR ||
1109 xfs_has_crc(mp)) {
1110 error = -EFSBADCRC;
1111 goto out_error;
1112 }
1113 }
1114 }
1115
1116 /*
1117 * Check all the superblock fields. Don't byteswap the xquota flags
1118 * because _verify_common checks the on-disk values.
1119 */
1120 __xfs_sb_from_disk(&sb, dsb, false);
1121 error = xfs_validate_sb_common(mp, bp, &sb);
1122 if (error)
1123 goto out_error;
1124 error = xfs_validate_sb_read(mp, &sb);
1125
1126out_error:
1127 if (error == -EFSCORRUPTED || error == -EFSBADCRC)
1128 xfs_verifier_error(bp, error, __this_address);
1129 else if (error)
1130 xfs_buf_ioerror(bp, error);
1131}
1132
1133/*
1134 * We may be probed for a filesystem match, so we may not want to emit
1135 * messages when the superblock buffer is not actually an XFS superblock.
1136 * If we find an XFS superblock, then run a normal, noisy mount because we are
1137 * really going to mount it and want to know about errors.
1138 */
1139static void
1140xfs_sb_quiet_read_verify(
1141 struct xfs_buf *bp)
1142{
1143 struct xfs_dsb *dsb = bp->b_addr;
1144
1145 if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC)) {
1146 /* XFS filesystem, verify noisily! */
1147 xfs_sb_read_verify(bp);
1148 return;
1149 }
1150 /* quietly fail */
1151 xfs_buf_ioerror(bp, -EWRONGFS);
1152}
1153
1154static void
1155xfs_sb_write_verify(
1156 struct xfs_buf *bp)
1157{
1158 struct xfs_sb sb;
1159 struct xfs_mount *mp = bp->b_mount;
1160 struct xfs_buf_log_item *bip = bp->b_log_item;
1161 struct xfs_dsb *dsb = bp->b_addr;
1162 int error;
1163
1164 /*
1165 * Check all the superblock fields. Don't byteswap the xquota flags
1166 * because _verify_common checks the on-disk values.
1167 */
1168 __xfs_sb_from_disk(&sb, dsb, false);
1169 error = xfs_validate_sb_common(mp, bp, &sb);
1170 if (error)
1171 goto out_error;
1172 error = xfs_validate_sb_write(mp, bp, &sb);
1173 if (error)
1174 goto out_error;
1175
1176 if (!xfs_sb_is_v5(&sb))
1177 return;
1178
1179 if (bip)
1180 dsb->sb_lsn = cpu_to_be64(bip->bli_item.li_lsn);
1181
1182 xfs_buf_update_cksum(bp, XFS_SB_CRC_OFF);
1183 return;
1184
1185out_error:
1186 xfs_verifier_error(bp, error, __this_address);
1187}
1188
1189const struct xfs_buf_ops xfs_sb_buf_ops = {
1190 .name = "xfs_sb",
1191 .magic = { cpu_to_be32(XFS_SB_MAGIC), cpu_to_be32(XFS_SB_MAGIC) },
1192 .verify_read = xfs_sb_read_verify,
1193 .verify_write = xfs_sb_write_verify,
1194};
1195
1196const struct xfs_buf_ops xfs_sb_quiet_buf_ops = {
1197 .name = "xfs_sb_quiet",
1198 .magic = { cpu_to_be32(XFS_SB_MAGIC), cpu_to_be32(XFS_SB_MAGIC) },
1199 .verify_read = xfs_sb_quiet_read_verify,
1200 .verify_write = xfs_sb_write_verify,
1201};
1202
1203/* Compute cached rt geometry from the incore sb. */
1204void
1205xfs_sb_mount_rextsize(
1206 struct xfs_mount *mp,
1207 struct xfs_sb *sbp)
1208{
1209 struct xfs_groups *rgs = &mp->m_groups[XG_TYPE_RTG];
1210
1211 mp->m_rtxblklog = log2_if_power2(sbp->sb_rextsize);
1212 mp->m_rtxblkmask = mask64_if_power2(sbp->sb_rextsize);
1213
1214 if (xfs_sb_is_v5(sbp) &&
1215 (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_METADIR)) {
1216 rgs->blocks = sbp->sb_rgextents * sbp->sb_rextsize;
1217 rgs->blklog = mp->m_sb.sb_rgblklog;
1218 rgs->blkmask = xfs_mask32lo(mp->m_sb.sb_rgblklog);
1219 rgs->start_fsb = mp->m_sb.sb_rtstart;
1220 if (xfs_sb_has_incompat_feature(sbp,
1221 XFS_SB_FEAT_INCOMPAT_ZONE_GAPS))
1222 rgs->has_daddr_gaps = true;
1223 } else {
1224 rgs->blocks = 0;
1225 rgs->blklog = 0;
1226 rgs->blkmask = (uint64_t)-1;
1227 }
1228}
1229
1230/* Update incore sb rt extent size, then recompute the cached rt geometry. */
1231void
1232xfs_mount_sb_set_rextsize(
1233 struct xfs_mount *mp,
1234 struct xfs_sb *sbp,
1235 xfs_agblock_t rextsize)
1236{
1237 sbp->sb_rextsize = rextsize;
1238 if (xfs_sb_is_v5(sbp) &&
1239 (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_METADIR))
1240 sbp->sb_rgblklog = xfs_compute_rgblklog(sbp->sb_rgextents,
1241 rextsize);
1242
1243 xfs_sb_mount_rextsize(mp, sbp);
1244}
1245
1246/*
1247 * xfs_mount_common
1248 *
1249 * Mount initialization code establishing various mount
1250 * fields from the superblock associated with the given
1251 * mount structure.
1252 *
1253 * Inode geometry are calculated in xfs_ialloc_setup_geometry.
1254 */
1255void
1256xfs_sb_mount_common(
1257 struct xfs_mount *mp,
1258 struct xfs_sb *sbp)
1259{
1260 struct xfs_groups *ags = &mp->m_groups[XG_TYPE_AG];
1261
1262 mp->m_agfrotor = 0;
1263 atomic_set(&mp->m_agirotor, 0);
1264 mp->m_maxagi = mp->m_sb.sb_agcount;
1265 mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG;
1266 mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT;
1267 mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT;
1268 mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1;
1269 mp->m_blockmask = sbp->sb_blocksize - 1;
1270 mp->m_blockwsize = xfs_rtbmblock_size(sbp) >> XFS_WORDLOG;
1271 mp->m_rtx_per_rbmblock = mp->m_blockwsize << XFS_NBWORDLOG;
1272
1273 ags->blocks = mp->m_sb.sb_agblocks;
1274 ags->blklog = mp->m_sb.sb_agblklog;
1275 ags->blkmask = xfs_mask32lo(mp->m_sb.sb_agblklog);
1276
1277 xfs_sb_mount_rextsize(mp, sbp);
1278
1279 mp->m_alloc_mxr[0] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, true);
1280 mp->m_alloc_mxr[1] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, false);
1281 mp->m_alloc_mnr[0] = mp->m_alloc_mxr[0] / 2;
1282 mp->m_alloc_mnr[1] = mp->m_alloc_mxr[1] / 2;
1283
1284 mp->m_bmap_dmxr[0] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, true);
1285 mp->m_bmap_dmxr[1] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, false);
1286 mp->m_bmap_dmnr[0] = mp->m_bmap_dmxr[0] / 2;
1287 mp->m_bmap_dmnr[1] = mp->m_bmap_dmxr[1] / 2;
1288
1289 mp->m_rmap_mxr[0] = xfs_rmapbt_maxrecs(mp, sbp->sb_blocksize, true);
1290 mp->m_rmap_mxr[1] = xfs_rmapbt_maxrecs(mp, sbp->sb_blocksize, false);
1291 mp->m_rmap_mnr[0] = mp->m_rmap_mxr[0] / 2;
1292 mp->m_rmap_mnr[1] = mp->m_rmap_mxr[1] / 2;
1293
1294 mp->m_rtrmap_mxr[0] = xfs_rtrmapbt_maxrecs(mp, sbp->sb_blocksize, true);
1295 mp->m_rtrmap_mxr[1] = xfs_rtrmapbt_maxrecs(mp, sbp->sb_blocksize, false);
1296 mp->m_rtrmap_mnr[0] = mp->m_rtrmap_mxr[0] / 2;
1297 mp->m_rtrmap_mnr[1] = mp->m_rtrmap_mxr[1] / 2;
1298
1299 mp->m_refc_mxr[0] = xfs_refcountbt_maxrecs(mp, sbp->sb_blocksize, true);
1300 mp->m_refc_mxr[1] = xfs_refcountbt_maxrecs(mp, sbp->sb_blocksize, false);
1301 mp->m_refc_mnr[0] = mp->m_refc_mxr[0] / 2;
1302 mp->m_refc_mnr[1] = mp->m_refc_mxr[1] / 2;
1303
1304 mp->m_rtrefc_mxr[0] = xfs_rtrefcountbt_maxrecs(mp, sbp->sb_blocksize,
1305 true);
1306 mp->m_rtrefc_mxr[1] = xfs_rtrefcountbt_maxrecs(mp, sbp->sb_blocksize,
1307 false);
1308 mp->m_rtrefc_mnr[0] = mp->m_rtrefc_mxr[0] / 2;
1309 mp->m_rtrefc_mnr[1] = mp->m_rtrefc_mxr[1] / 2;
1310
1311 mp->m_bsize = XFS_FSB_TO_BB(mp, 1);
1312 mp->m_alloc_set_aside = xfs_alloc_set_aside(mp);
1313 mp->m_ag_max_usable = xfs_alloc_ag_max_usable(mp);
1314}
1315
1316/*
1317 * xfs_log_sb() can be used to copy arbitrary changes to the in-core superblock
1318 * into the superblock buffer to be logged. It does not provide the higher
1319 * level of locking that is needed to protect the in-core superblock from
1320 * concurrent access.
1321 */
1322void
1323xfs_log_sb(
1324 struct xfs_trans *tp)
1325{
1326 struct xfs_mount *mp = tp->t_mountp;
1327 struct xfs_buf *bp = xfs_trans_getsb(tp);
1328
1329 /*
1330 * Lazy sb counters don't update the in-core superblock so do that now.
1331 * If this is at unmount, the counters will be exactly correct, but at
1332 * any other time they will only be ballpark correct because of
1333 * reservations that have been taken out percpu counters. If we have an
1334 * unclean shutdown, this will be corrected by log recovery rebuilding
1335 * the counters from the AGF block counts.
1336 */
1337 if (xfs_has_lazysbcount(mp)) {
1338 mp->m_sb.sb_icount = percpu_counter_sum_positive(&mp->m_icount);
1339 mp->m_sb.sb_ifree = min_t(uint64_t,
1340 percpu_counter_sum_positive(&mp->m_ifree),
1341 mp->m_sb.sb_icount);
1342 mp->m_sb.sb_fdblocks = xfs_sum_freecounter(mp, XC_FREE_BLOCKS);
1343 }
1344
1345 /*
1346 * sb_frextents was added to the lazy sb counters when the rt groups
1347 * feature was introduced. This counter can go negative due to the way
1348 * we handle nearly-lockless reservations, so we must use the _positive
1349 * variant here to avoid writing out nonsense frextents.
1350 *
1351 * RT groups are only supported on v5 file systems, which always
1352 * have lazy SB counters.
1353 */
1354 if (xfs_has_rtgroups(mp) && !xfs_has_zoned(mp)) {
1355 mp->m_sb.sb_frextents =
1356 xfs_sum_freecounter(mp, XC_FREE_RTEXTENTS);
1357 }
1358
1359 xfs_sb_to_disk(bp->b_addr, &mp->m_sb);
1360 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF);
1361 xfs_trans_log_buf(tp, bp, 0, sizeof(struct xfs_dsb) - 1);
1362}
1363
1364/*
1365 * xfs_sync_sb
1366 *
1367 * Sync the superblock to disk.
1368 *
1369 * Note that the caller is responsible for checking the frozen state of the
1370 * filesystem. This procedure uses the non-blocking transaction allocator and
1371 * thus will allow modifications to a frozen fs. This is required because this
1372 * code can be called during the process of freezing where use of the high-level
1373 * allocator would deadlock.
1374 */
1375int
1376xfs_sync_sb(
1377 struct xfs_mount *mp,
1378 bool wait)
1379{
1380 struct xfs_trans *tp;
1381 int error;
1382
1383 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_sb, 0, 0,
1384 XFS_TRANS_NO_WRITECOUNT, &tp);
1385 if (error)
1386 return error;
1387
1388 xfs_log_sb(tp);
1389 if (wait)
1390 xfs_trans_set_sync(tp);
1391 return xfs_trans_commit(tp);
1392}
1393
1394/*
1395 * Update all the secondary superblocks to match the new state of the primary.
1396 * Because we are completely overwriting all the existing fields in the
1397 * secondary superblock buffers, there is no need to read them in from disk.
1398 * Just get a new buffer, stamp it and write it.
1399 *
1400 * The sb buffers need to be cached here so that we serialise against other
1401 * operations that access the secondary superblocks, but we don't want to keep
1402 * them in memory once it is written so we mark it as a one-shot buffer.
1403 */
1404int
1405xfs_update_secondary_sbs(
1406 struct xfs_mount *mp)
1407{
1408 struct xfs_perag *pag = NULL;
1409 int saved_error = 0;
1410 int error = 0;
1411 LIST_HEAD (buffer_list);
1412
1413 /* update secondary superblocks. */
1414 while ((pag = xfs_perag_next_from(mp, pag, 1))) {
1415 struct xfs_buf *bp;
1416
1417 error = xfs_buf_get(mp->m_ddev_targp,
1418 XFS_AG_DADDR(mp, pag_agno(pag), XFS_SB_DADDR),
1419 XFS_FSS_TO_BB(mp, 1), &bp);
1420 /*
1421 * If we get an error reading or writing alternate superblocks,
1422 * continue. xfs_repair chooses the "best" superblock based
1423 * on most matches; if we break early, we'll leave more
1424 * superblocks un-updated than updated, and xfs_repair may
1425 * pick them over the properly-updated primary.
1426 */
1427 if (error) {
1428 xfs_warn(mp,
1429 "error allocating secondary superblock for ag %d",
1430 pag_agno(pag));
1431 if (!saved_error)
1432 saved_error = error;
1433 continue;
1434 }
1435
1436 bp->b_ops = &xfs_sb_buf_ops;
1437 xfs_buf_oneshot(bp);
1438 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
1439 xfs_sb_to_disk(bp->b_addr, &mp->m_sb);
1440 xfs_buf_delwri_queue(bp, &buffer_list);
1441 xfs_buf_relse(bp);
1442
1443 /* don't hold too many buffers at once */
1444 if (pag_agno(pag) % 16)
1445 continue;
1446
1447 error = xfs_buf_delwri_submit(&buffer_list);
1448 if (error) {
1449 xfs_warn(mp,
1450 "write error %d updating a secondary superblock near ag %d",
1451 error, pag_agno(pag));
1452 if (!saved_error)
1453 saved_error = error;
1454 continue;
1455 }
1456 }
1457 error = xfs_buf_delwri_submit(&buffer_list);
1458 if (error)
1459 xfs_warn(mp, "error %d writing secondary superblocks", error);
1460 return saved_error ? saved_error : error;
1461}
1462
1463/*
1464 * Same behavior as xfs_sync_sb, except that it is always synchronous and it
1465 * also writes the superblock buffer to disk sector 0 immediately.
1466 */
1467int
1468xfs_sync_sb_buf(
1469 struct xfs_mount *mp,
1470 bool update_rtsb)
1471{
1472 struct xfs_trans *tp;
1473 struct xfs_buf *bp;
1474 struct xfs_buf *rtsb_bp = NULL;
1475 int error;
1476
1477 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_sb, 0, 0, 0, &tp);
1478 if (error)
1479 return error;
1480
1481 bp = xfs_trans_getsb(tp);
1482 xfs_log_sb(tp);
1483 xfs_trans_bhold(tp, bp);
1484 if (update_rtsb) {
1485 rtsb_bp = xfs_log_rtsb(tp, bp);
1486 if (rtsb_bp)
1487 xfs_trans_bhold(tp, rtsb_bp);
1488 }
1489 xfs_trans_set_sync(tp);
1490 error = xfs_trans_commit(tp);
1491 if (error)
1492 goto out;
1493 /*
1494 * write out the sb buffer to get the changes to disk
1495 */
1496 error = xfs_bwrite(bp);
1497 if (!error && rtsb_bp)
1498 error = xfs_bwrite(rtsb_bp);
1499out:
1500 if (rtsb_bp)
1501 xfs_buf_relse(rtsb_bp);
1502 xfs_buf_relse(bp);
1503 return error;
1504}
1505
1506void
1507xfs_fs_geometry(
1508 struct xfs_mount *mp,
1509 struct xfs_fsop_geom *geo,
1510 int struct_version)
1511{
1512 struct xfs_sb *sbp = &mp->m_sb;
1513
1514 memset(geo, 0, sizeof(struct xfs_fsop_geom));
1515
1516 geo->blocksize = sbp->sb_blocksize;
1517 geo->rtextsize = sbp->sb_rextsize;
1518 geo->agblocks = sbp->sb_agblocks;
1519 geo->agcount = sbp->sb_agcount;
1520 geo->logblocks = sbp->sb_logblocks;
1521 geo->sectsize = sbp->sb_sectsize;
1522 geo->inodesize = sbp->sb_inodesize;
1523 geo->imaxpct = sbp->sb_imax_pct;
1524 geo->datablocks = sbp->sb_dblocks;
1525 geo->rtblocks = sbp->sb_rblocks;
1526 geo->rtextents = sbp->sb_rextents;
1527 geo->logstart = sbp->sb_logstart;
1528 BUILD_BUG_ON(sizeof(geo->uuid) != sizeof(sbp->sb_uuid));
1529 memcpy(geo->uuid, &sbp->sb_uuid, sizeof(sbp->sb_uuid));
1530
1531 if (struct_version < 2)
1532 return;
1533
1534 geo->sunit = sbp->sb_unit;
1535 geo->swidth = sbp->sb_width;
1536
1537 if (struct_version < 3)
1538 return;
1539
1540 geo->version = XFS_FSOP_GEOM_VERSION;
1541 geo->flags = XFS_FSOP_GEOM_FLAGS_NLINK |
1542 XFS_FSOP_GEOM_FLAGS_DIRV2 |
1543 XFS_FSOP_GEOM_FLAGS_EXTFLG |
1544 XFS_FSOP_GEOM_FLAGS_ATTR2;
1545 if (xfs_has_attr(mp))
1546 geo->flags |= XFS_FSOP_GEOM_FLAGS_ATTR;
1547 if (xfs_has_quota(mp))
1548 geo->flags |= XFS_FSOP_GEOM_FLAGS_QUOTA;
1549 if (xfs_has_align(mp))
1550 geo->flags |= XFS_FSOP_GEOM_FLAGS_IALIGN;
1551 if (xfs_has_dalign(mp))
1552 geo->flags |= XFS_FSOP_GEOM_FLAGS_DALIGN;
1553 if (xfs_has_asciici(mp))
1554 geo->flags |= XFS_FSOP_GEOM_FLAGS_DIRV2CI;
1555 if (xfs_has_lazysbcount(mp))
1556 geo->flags |= XFS_FSOP_GEOM_FLAGS_LAZYSB;
1557 if (xfs_has_projid32(mp))
1558 geo->flags |= XFS_FSOP_GEOM_FLAGS_PROJID32;
1559 if (xfs_has_crc(mp))
1560 geo->flags |= XFS_FSOP_GEOM_FLAGS_V5SB;
1561 if (xfs_has_ftype(mp))
1562 geo->flags |= XFS_FSOP_GEOM_FLAGS_FTYPE;
1563 if (xfs_has_finobt(mp))
1564 geo->flags |= XFS_FSOP_GEOM_FLAGS_FINOBT;
1565 if (xfs_has_sparseinodes(mp))
1566 geo->flags |= XFS_FSOP_GEOM_FLAGS_SPINODES;
1567 if (xfs_has_rmapbt(mp))
1568 geo->flags |= XFS_FSOP_GEOM_FLAGS_RMAPBT;
1569 if (xfs_has_reflink(mp))
1570 geo->flags |= XFS_FSOP_GEOM_FLAGS_REFLINK;
1571 if (xfs_has_bigtime(mp))
1572 geo->flags |= XFS_FSOP_GEOM_FLAGS_BIGTIME;
1573 if (xfs_has_inobtcounts(mp))
1574 geo->flags |= XFS_FSOP_GEOM_FLAGS_INOBTCNT;
1575 if (xfs_has_parent(mp))
1576 geo->flags |= XFS_FSOP_GEOM_FLAGS_PARENT;
1577 if (xfs_has_sector(mp)) {
1578 geo->flags |= XFS_FSOP_GEOM_FLAGS_SECTOR;
1579 geo->logsectsize = sbp->sb_logsectsize;
1580 } else {
1581 geo->logsectsize = BBSIZE;
1582 }
1583 if (xfs_has_large_extent_counts(mp))
1584 geo->flags |= XFS_FSOP_GEOM_FLAGS_NREXT64;
1585 if (xfs_has_exchange_range(mp))
1586 geo->flags |= XFS_FSOP_GEOM_FLAGS_EXCHANGE_RANGE;
1587 if (xfs_has_metadir(mp))
1588 geo->flags |= XFS_FSOP_GEOM_FLAGS_METADIR;
1589 if (xfs_has_zoned(mp))
1590 geo->flags |= XFS_FSOP_GEOM_FLAGS_ZONED;
1591 geo->rtsectsize = sbp->sb_blocksize;
1592 geo->dirblocksize = xfs_dir2_dirblock_bytes(sbp);
1593
1594 if (struct_version < 4)
1595 return;
1596
1597 if (xfs_has_logv2(mp))
1598 geo->flags |= XFS_FSOP_GEOM_FLAGS_LOGV2;
1599
1600 geo->logsunit = sbp->sb_logsunit;
1601
1602 if (struct_version < 5)
1603 return;
1604
1605 geo->version = XFS_FSOP_GEOM_VERSION_V5;
1606
1607 if (xfs_has_rtgroups(mp)) {
1608 geo->rgcount = sbp->sb_rgcount;
1609 geo->rgextents = sbp->sb_rgextents;
1610 }
1611 if (xfs_has_zoned(mp)) {
1612 geo->rtstart = sbp->sb_rtstart;
1613 geo->rtreserved = sbp->sb_rtreserved;
1614 }
1615}
1616
1617/* Read a secondary superblock. */
1618int
1619xfs_sb_read_secondary(
1620 struct xfs_mount *mp,
1621 struct xfs_trans *tp,
1622 xfs_agnumber_t agno,
1623 struct xfs_buf **bpp)
1624{
1625 struct xfs_buf *bp;
1626 int error;
1627
1628 ASSERT(agno != 0 && agno != NULLAGNUMBER);
1629 error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
1630 XFS_AG_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
1631 XFS_FSS_TO_BB(mp, 1), 0, &bp, &xfs_sb_buf_ops);
1632 if (xfs_metadata_is_sick(error))
1633 xfs_agno_mark_sick(mp, agno, XFS_SICK_AG_SB);
1634 if (error)
1635 return error;
1636 xfs_buf_set_ref(bp, XFS_SSB_REF);
1637 *bpp = bp;
1638 return 0;
1639}
1640
1641/* Get an uninitialised secondary superblock buffer. */
1642int
1643xfs_sb_get_secondary(
1644 struct xfs_mount *mp,
1645 struct xfs_trans *tp,
1646 xfs_agnumber_t agno,
1647 struct xfs_buf **bpp)
1648{
1649 struct xfs_buf *bp;
1650 int error;
1651
1652 ASSERT(agno != 0 && agno != NULLAGNUMBER);
1653 error = xfs_trans_get_buf(tp, mp->m_ddev_targp,
1654 XFS_AG_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
1655 XFS_FSS_TO_BB(mp, 1), 0, &bp);
1656 if (error)
1657 return error;
1658 bp->b_ops = &xfs_sb_buf_ops;
1659 xfs_buf_oneshot(bp);
1660 *bpp = bp;
1661 return 0;
1662}
1663
1664/*
1665 * sunit, swidth, sectorsize(optional with 0) should be all in bytes, so users
1666 * won't be confused by values in error messages. This function returns false
1667 * if the stripe geometry is invalid and the caller is unable to repair the
1668 * stripe configuration later in the mount process.
1669 */
1670bool
1671xfs_validate_stripe_geometry(
1672 struct xfs_mount *mp,
1673 __s64 sunit,
1674 __s64 swidth,
1675 int sectorsize,
1676 bool may_repair,
1677 bool silent)
1678{
1679 if (swidth > INT_MAX) {
1680 if (!silent)
1681 xfs_notice(mp,
1682"stripe width (%lld) is too large", swidth);
1683 goto check_override;
1684 }
1685
1686 if (sunit > swidth) {
1687 if (!silent)
1688 xfs_notice(mp,
1689"stripe unit (%lld) is larger than the stripe width (%lld)", sunit, swidth);
1690 goto check_override;
1691 }
1692
1693 if (sectorsize && (int)sunit % sectorsize) {
1694 if (!silent)
1695 xfs_notice(mp,
1696"stripe unit (%lld) must be a multiple of the sector size (%d)",
1697 sunit, sectorsize);
1698 goto check_override;
1699 }
1700
1701 if (sunit && !swidth) {
1702 if (!silent)
1703 xfs_notice(mp,
1704"invalid stripe unit (%lld) and stripe width of 0", sunit);
1705 goto check_override;
1706 }
1707
1708 if (!sunit && swidth) {
1709 if (!silent)
1710 xfs_notice(mp,
1711"invalid stripe width (%lld) and stripe unit of 0", swidth);
1712 goto check_override;
1713 }
1714
1715 if (sunit && (int)swidth % (int)sunit) {
1716 if (!silent)
1717 xfs_notice(mp,
1718"stripe width (%lld) must be a multiple of the stripe unit (%lld)",
1719 swidth, sunit);
1720 goto check_override;
1721 }
1722 return true;
1723
1724check_override:
1725 if (!may_repair)
1726 return false;
1727 /*
1728 * During mount, mp->m_dalign will not be set unless the sunit mount
1729 * option was set. If it was set, ignore the bad stripe alignment values
1730 * and allow the validation and overwrite later in the mount process to
1731 * attempt to overwrite the bad stripe alignment values with the values
1732 * supplied by mount options.
1733 */
1734 if (!mp->m_dalign)
1735 return false;
1736 if (!silent)
1737 xfs_notice(mp,
1738"Will try to correct with specified mount options sunit (%d) and swidth (%d)",
1739 BBTOB(mp->m_dalign), BBTOB(mp->m_swidth));
1740 return true;
1741}
1742
1743/*
1744 * Compute the maximum level number of the realtime summary file, as defined by
1745 * mkfs. The historic use of highbit32 on a 64-bit quantity prohibited correct
1746 * use of rt volumes with more than 2^32 extents.
1747 */
1748uint8_t
1749xfs_compute_rextslog(
1750 xfs_rtbxlen_t rtextents)
1751{
1752 if (!rtextents)
1753 return 0;
1754 return xfs_highbit64(rtextents);
1755}