1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2000-2005 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_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
31 /*
32 * Physical superblock buffer manipulations. Shared with libxfs in userspace.
33 */
34
35 /*
36 * Check that all the V4 feature bits that the V5 filesystem format requires are
37 * correctly set.
38 */
39 static bool
xfs_sb_validate_v5_features(struct xfs_sb * sbp)40 xfs_sb_validate_v5_features(
41 struct xfs_sb *sbp)
42 {
43 /* We must not have any unknown V4 feature bits set */
44 if (sbp->sb_versionnum & ~XFS_SB_VERSION_OKBITS)
45 return false;
46
47 /*
48 * The CRC bit is considered an invalid V4 flag, so we have to add it
49 * manually to the OKBITS mask.
50 */
51 if (sbp->sb_features2 & ~(XFS_SB_VERSION2_OKBITS |
52 XFS_SB_VERSION2_CRCBIT))
53 return false;
54
55 /* Now check all the required V4 feature flags are set. */
56
57 #define V5_VERS_FLAGS (XFS_SB_VERSION_NLINKBIT | \
58 XFS_SB_VERSION_ALIGNBIT | \
59 XFS_SB_VERSION_LOGV2BIT | \
60 XFS_SB_VERSION_EXTFLGBIT | \
61 XFS_SB_VERSION_DIRV2BIT | \
62 XFS_SB_VERSION_MOREBITSBIT)
63
64 #define V5_FEAT_FLAGS (XFS_SB_VERSION2_LAZYSBCOUNTBIT | \
65 XFS_SB_VERSION2_ATTR2BIT | \
66 XFS_SB_VERSION2_PROJID32BIT | \
67 XFS_SB_VERSION2_CRCBIT)
68
69 if ((sbp->sb_versionnum & V5_VERS_FLAGS) != V5_VERS_FLAGS)
70 return false;
71 if ((sbp->sb_features2 & V5_FEAT_FLAGS) != V5_FEAT_FLAGS)
72 return false;
73 return true;
74 }
75
76 /*
77 * We current support XFS v5 formats with known features and v4 superblocks with
78 * at least V2 directories.
79 */
80 bool
xfs_sb_good_version(struct xfs_sb * sbp)81 xfs_sb_good_version(
82 struct xfs_sb *sbp)
83 {
84 /*
85 * All v5 filesystems are supported, but we must check that all the
86 * required v4 feature flags are enabled correctly as the code checks
87 * those flags and not for v5 support.
88 */
89 if (xfs_sb_is_v5(sbp))
90 return xfs_sb_validate_v5_features(sbp);
91
92 /* versions prior to v4 are not supported */
93 if (XFS_SB_VERSION_NUM(sbp) != XFS_SB_VERSION_4)
94 return false;
95
96 /* We must not have any unknown v4 feature bits set */
97 if ((sbp->sb_versionnum & ~XFS_SB_VERSION_OKBITS) ||
98 ((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) &&
99 (sbp->sb_features2 & ~XFS_SB_VERSION2_OKBITS)))
100 return false;
101
102 /* V4 filesystems need v2 directories and unwritten extents */
103 if (!(sbp->sb_versionnum & XFS_SB_VERSION_DIRV2BIT))
104 return false;
105 if (!(sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT))
106 return false;
107
108 /* It's a supported v4 filesystem */
109 return true;
110 }
111
112 uint64_t
xfs_sb_version_to_features(struct xfs_sb * sbp)113 xfs_sb_version_to_features(
114 struct xfs_sb *sbp)
115 {
116 uint64_t features = 0;
117
118 /* optional V4 features */
119 if (sbp->sb_rblocks > 0)
120 features |= XFS_FEAT_REALTIME;
121 if (sbp->sb_versionnum & XFS_SB_VERSION_NLINKBIT)
122 features |= XFS_FEAT_NLINK;
123 if (sbp->sb_versionnum & XFS_SB_VERSION_ATTRBIT)
124 features |= XFS_FEAT_ATTR;
125 if (sbp->sb_versionnum & XFS_SB_VERSION_QUOTABIT)
126 features |= XFS_FEAT_QUOTA;
127 if (sbp->sb_versionnum & XFS_SB_VERSION_ALIGNBIT)
128 features |= XFS_FEAT_ALIGN;
129 if (sbp->sb_versionnum & XFS_SB_VERSION_LOGV2BIT)
130 features |= XFS_FEAT_LOGV2;
131 if (sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT)
132 features |= XFS_FEAT_DALIGN;
133 if (sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT)
134 features |= XFS_FEAT_EXTFLG;
135 if (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT)
136 features |= XFS_FEAT_SECTOR;
137 if (sbp->sb_versionnum & XFS_SB_VERSION_BORGBIT)
138 features |= XFS_FEAT_ASCIICI;
139 if (sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) {
140 if (sbp->sb_features2 & XFS_SB_VERSION2_LAZYSBCOUNTBIT)
141 features |= XFS_FEAT_LAZYSBCOUNT;
142 if (sbp->sb_features2 & XFS_SB_VERSION2_ATTR2BIT)
143 features |= XFS_FEAT_ATTR2;
144 if (sbp->sb_features2 & XFS_SB_VERSION2_PROJID32BIT)
145 features |= XFS_FEAT_PROJID32;
146 if (sbp->sb_features2 & XFS_SB_VERSION2_FTYPE)
147 features |= XFS_FEAT_FTYPE;
148 }
149
150 if (!xfs_sb_is_v5(sbp))
151 return features;
152
153 /* Always on V5 features */
154 features |= XFS_FEAT_ALIGN | XFS_FEAT_LOGV2 | XFS_FEAT_EXTFLG |
155 XFS_FEAT_LAZYSBCOUNT | XFS_FEAT_ATTR2 | XFS_FEAT_PROJID32 |
156 XFS_FEAT_V3INODES | XFS_FEAT_CRC | XFS_FEAT_PQUOTINO;
157
158 /* Optional V5 features */
159 if (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_FINOBT)
160 features |= XFS_FEAT_FINOBT;
161 if (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_RMAPBT)
162 features |= XFS_FEAT_RMAPBT;
163 if (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_REFLINK)
164 features |= XFS_FEAT_REFLINK;
165 if (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_INOBTCNT)
166 features |= XFS_FEAT_INOBTCNT;
167 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_FTYPE)
168 features |= XFS_FEAT_FTYPE;
169 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_SPINODES)
170 features |= XFS_FEAT_SPINODES;
171 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID)
172 features |= XFS_FEAT_META_UUID;
173 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_BIGTIME)
174 features |= XFS_FEAT_BIGTIME;
175 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR)
176 features |= XFS_FEAT_NEEDSREPAIR;
177 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_NREXT64)
178 features |= XFS_FEAT_NREXT64;
179 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_EXCHRANGE)
180 features |= XFS_FEAT_EXCHANGE_RANGE;
181 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_PARENT)
182 features |= XFS_FEAT_PARENT;
183
184 return features;
185 }
186
187 /* Check all the superblock fields we care about when reading one in. */
188 STATIC int
xfs_validate_sb_read(struct xfs_mount * mp,struct xfs_sb * sbp)189 xfs_validate_sb_read(
190 struct xfs_mount *mp,
191 struct xfs_sb *sbp)
192 {
193 if (!xfs_sb_is_v5(sbp))
194 return 0;
195
196 /*
197 * Version 5 superblock feature mask validation. Reject combinations
198 * the kernel cannot support up front before checking anything else.
199 */
200 if (xfs_sb_has_compat_feature(sbp, XFS_SB_FEAT_COMPAT_UNKNOWN)) {
201 xfs_warn(mp,
202 "Superblock has unknown compatible features (0x%x) enabled.",
203 (sbp->sb_features_compat & XFS_SB_FEAT_COMPAT_UNKNOWN));
204 xfs_warn(mp,
205 "Using a more recent kernel is recommended.");
206 }
207
208 if (xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
209 xfs_alert(mp,
210 "Superblock has unknown read-only compatible features (0x%x) enabled.",
211 (sbp->sb_features_ro_compat &
212 XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
213 if (!xfs_is_readonly(mp)) {
214 xfs_warn(mp,
215 "Attempted to mount read-only compatible filesystem read-write.");
216 xfs_warn(mp,
217 "Filesystem can only be safely mounted read only.");
218
219 return -EINVAL;
220 }
221 }
222 if (xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_UNKNOWN)) {
223 xfs_warn(mp,
224 "Superblock has unknown incompatible features (0x%x) enabled.",
225 (sbp->sb_features_incompat &
226 XFS_SB_FEAT_INCOMPAT_UNKNOWN));
227 xfs_warn(mp,
228 "Filesystem cannot be safely mounted by this kernel.");
229 return -EINVAL;
230 }
231
232 return 0;
233 }
234
235 static uint64_t
xfs_sb_calc_rbmblocks(struct xfs_sb * sbp)236 xfs_sb_calc_rbmblocks(
237 struct xfs_sb *sbp)
238 {
239 return howmany_64(sbp->sb_rextents, NBBY * sbp->sb_blocksize);
240 }
241
242 /* Validate the realtime geometry */
243 bool
xfs_validate_rt_geometry(struct xfs_sb * sbp)244 xfs_validate_rt_geometry(
245 struct xfs_sb *sbp)
246 {
247 if (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE ||
248 sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE)
249 return false;
250
251 if (sbp->sb_rblocks == 0) {
252 if (sbp->sb_rextents != 0 || sbp->sb_rbmblocks != 0 ||
253 sbp->sb_rextslog != 0 || sbp->sb_frextents != 0)
254 return false;
255 return true;
256 }
257
258 if (sbp->sb_rextents == 0 ||
259 sbp->sb_rextents != div_u64(sbp->sb_rblocks, sbp->sb_rextsize) ||
260 sbp->sb_rextslog != xfs_compute_rextslog(sbp->sb_rextents) ||
261 sbp->sb_rbmblocks != xfs_sb_calc_rbmblocks(sbp))
262 return false;
263
264 return true;
265 }
266
267 /* Check all the superblock fields we care about when writing one out. */
268 STATIC int
xfs_validate_sb_write(struct xfs_mount * mp,struct xfs_buf * bp,struct xfs_sb * sbp)269 xfs_validate_sb_write(
270 struct xfs_mount *mp,
271 struct xfs_buf *bp,
272 struct xfs_sb *sbp)
273 {
274 /*
275 * Carry out additional sb summary counter sanity checks when we write
276 * the superblock. We skip this in the read validator because there
277 * could be newer superblocks in the log and if the values are garbage
278 * even after replay we'll recalculate them at the end of log mount.
279 *
280 * mkfs has traditionally written zeroed counters to inprogress and
281 * secondary superblocks, so allow this usage to continue because
282 * we never read counters from such superblocks.
283 */
284 if (xfs_buf_daddr(bp) == XFS_SB_DADDR && !sbp->sb_inprogress &&
285 (sbp->sb_fdblocks > sbp->sb_dblocks ||
286 !xfs_verify_icount(mp, sbp->sb_icount) ||
287 sbp->sb_ifree > sbp->sb_icount)) {
288 xfs_warn(mp, "SB summary counter sanity check failed");
289 return -EFSCORRUPTED;
290 }
291
292 if (!xfs_sb_is_v5(sbp))
293 return 0;
294
295 /*
296 * Version 5 superblock feature mask validation. Reject combinations
297 * the kernel cannot support since we checked for unsupported bits in
298 * the read verifier, which means that memory is corrupt.
299 */
300 if (xfs_sb_has_compat_feature(sbp, XFS_SB_FEAT_COMPAT_UNKNOWN)) {
301 xfs_warn(mp,
302 "Corruption detected in superblock compatible features (0x%x)!",
303 (sbp->sb_features_compat & XFS_SB_FEAT_COMPAT_UNKNOWN));
304 return -EFSCORRUPTED;
305 }
306
307 if (!xfs_is_readonly(mp) &&
308 xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
309 xfs_alert(mp,
310 "Corruption detected in superblock read-only compatible features (0x%x)!",
311 (sbp->sb_features_ro_compat &
312 XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
313 return -EFSCORRUPTED;
314 }
315 if (xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_UNKNOWN)) {
316 xfs_warn(mp,
317 "Corruption detected in superblock incompatible features (0x%x)!",
318 (sbp->sb_features_incompat &
319 XFS_SB_FEAT_INCOMPAT_UNKNOWN));
320 return -EFSCORRUPTED;
321 }
322 if (xfs_sb_has_incompat_log_feature(sbp,
323 XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN)) {
324 xfs_warn(mp,
325 "Corruption detected in superblock incompatible log features (0x%x)!",
326 (sbp->sb_features_log_incompat &
327 XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN));
328 return -EFSCORRUPTED;
329 }
330
331 /*
332 * We can't read verify the sb LSN because the read verifier is called
333 * before the log is allocated and processed. We know the log is set up
334 * before write verifier calls, so check it here.
335 */
336 if (!xfs_log_check_lsn(mp, sbp->sb_lsn))
337 return -EFSCORRUPTED;
338
339 return 0;
340 }
341
342 /* Check the validity of the SB. */
343 STATIC int
xfs_validate_sb_common(struct xfs_mount * mp,struct xfs_buf * bp,struct xfs_sb * sbp)344 xfs_validate_sb_common(
345 struct xfs_mount *mp,
346 struct xfs_buf *bp,
347 struct xfs_sb *sbp)
348 {
349 struct xfs_dsb *dsb = bp->b_addr;
350 uint32_t agcount = 0;
351 uint32_t rem;
352 bool has_dalign;
353
354 if (!xfs_verify_magic(bp, dsb->sb_magicnum)) {
355 xfs_warn(mp,
356 "Superblock has bad magic number 0x%x. Not an XFS filesystem?",
357 be32_to_cpu(dsb->sb_magicnum));
358 return -EWRONGFS;
359 }
360
361 if (!xfs_sb_good_version(sbp)) {
362 xfs_warn(mp,
363 "Superblock has unknown features enabled or corrupted feature masks.");
364 return -EWRONGFS;
365 }
366
367 /*
368 * Validate feature flags and state
369 */
370 if (xfs_sb_is_v5(sbp)) {
371 if (sbp->sb_blocksize < XFS_MIN_CRC_BLOCKSIZE) {
372 xfs_notice(mp,
373 "Block size (%u bytes) too small for Version 5 superblock (minimum %d bytes)",
374 sbp->sb_blocksize, XFS_MIN_CRC_BLOCKSIZE);
375 return -EFSCORRUPTED;
376 }
377
378 /* V5 has a separate project quota inode */
379 if (sbp->sb_qflags & (XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD)) {
380 xfs_notice(mp,
381 "Version 5 of Super block has XFS_OQUOTA bits.");
382 return -EFSCORRUPTED;
383 }
384
385 /*
386 * Full inode chunks must be aligned to inode chunk size when
387 * sparse inodes are enabled to support the sparse chunk
388 * allocation algorithm and prevent overlapping inode records.
389 */
390 if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_SPINODES) {
391 uint32_t align;
392
393 align = XFS_INODES_PER_CHUNK * sbp->sb_inodesize
394 >> sbp->sb_blocklog;
395 if (sbp->sb_inoalignmt != align) {
396 xfs_warn(mp,
397 "Inode block alignment (%u) must match chunk size (%u) for sparse inodes.",
398 sbp->sb_inoalignmt, align);
399 return -EINVAL;
400 }
401 }
402 } else if (sbp->sb_qflags & (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD |
403 XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD)) {
404 xfs_notice(mp,
405 "Superblock earlier than Version 5 has XFS_{P|G}QUOTA_{ENFD|CHKD} bits.");
406 return -EFSCORRUPTED;
407 }
408
409 if (unlikely(
410 sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) {
411 xfs_warn(mp,
412 "filesystem is marked as having an external log; "
413 "specify logdev on the mount command line.");
414 return -EINVAL;
415 }
416
417 if (unlikely(
418 sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) {
419 xfs_warn(mp,
420 "filesystem is marked as having an internal log; "
421 "do not specify logdev on the mount command line.");
422 return -EINVAL;
423 }
424
425 /* Compute agcount for this number of dblocks and agblocks */
426 if (sbp->sb_agblocks) {
427 agcount = div_u64_rem(sbp->sb_dblocks, sbp->sb_agblocks, &rem);
428 if (rem)
429 agcount++;
430 }
431
432 /*
433 * More sanity checking. Most of these were stolen directly from
434 * xfs_repair.
435 */
436 if (unlikely(
437 sbp->sb_agcount <= 0 ||
438 sbp->sb_sectsize < XFS_MIN_SECTORSIZE ||
439 sbp->sb_sectsize > XFS_MAX_SECTORSIZE ||
440 sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG ||
441 sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG ||
442 sbp->sb_sectsize != (1 << sbp->sb_sectlog) ||
443 sbp->sb_blocksize < XFS_MIN_BLOCKSIZE ||
444 sbp->sb_blocksize > XFS_MAX_BLOCKSIZE ||
445 sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG ||
446 sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG ||
447 sbp->sb_blocksize != (1 << sbp->sb_blocklog) ||
448 sbp->sb_dirblklog + sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG ||
449 sbp->sb_inodesize < XFS_DINODE_MIN_SIZE ||
450 sbp->sb_inodesize > XFS_DINODE_MAX_SIZE ||
451 sbp->sb_inodelog < XFS_DINODE_MIN_LOG ||
452 sbp->sb_inodelog > XFS_DINODE_MAX_LOG ||
453 sbp->sb_inodesize != (1 << sbp->sb_inodelog) ||
454 sbp->sb_inopblock != howmany(sbp->sb_blocksize,sbp->sb_inodesize) ||
455 XFS_FSB_TO_B(mp, sbp->sb_agblocks) < XFS_MIN_AG_BYTES ||
456 XFS_FSB_TO_B(mp, sbp->sb_agblocks) > XFS_MAX_AG_BYTES ||
457 sbp->sb_agblklog != xfs_highbit32(sbp->sb_agblocks - 1) + 1 ||
458 agcount == 0 || agcount != sbp->sb_agcount ||
459 (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) ||
460 (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) ||
461 (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) ||
462 (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */) ||
463 sbp->sb_dblocks == 0 ||
464 sbp->sb_dblocks > XFS_MAX_DBLOCKS(sbp) ||
465 sbp->sb_dblocks < XFS_MIN_DBLOCKS(sbp) ||
466 sbp->sb_shared_vn != 0)) {
467 xfs_notice(mp, "SB sanity check failed");
468 return -EFSCORRUPTED;
469 }
470
471 /*
472 * Logs that are too large are not supported at all. Reject them
473 * outright. Logs that are too small are tolerated on v4 filesystems,
474 * but we can only check that when mounting the log. Hence we skip
475 * those checks here.
476 */
477 if (sbp->sb_logblocks > XFS_MAX_LOG_BLOCKS) {
478 xfs_notice(mp,
479 "Log size 0x%x blocks too large, maximum size is 0x%llx blocks",
480 sbp->sb_logblocks, XFS_MAX_LOG_BLOCKS);
481 return -EFSCORRUPTED;
482 }
483
484 if (XFS_FSB_TO_B(mp, sbp->sb_logblocks) > XFS_MAX_LOG_BYTES) {
485 xfs_warn(mp,
486 "log size 0x%llx bytes too large, maximum size is 0x%llx bytes",
487 XFS_FSB_TO_B(mp, sbp->sb_logblocks),
488 XFS_MAX_LOG_BYTES);
489 return -EFSCORRUPTED;
490 }
491
492 /*
493 * Do not allow filesystems with corrupted log sector or stripe units to
494 * be mounted. We cannot safely size the iclogs or write to the log if
495 * the log stripe unit is not valid.
496 */
497 if (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT) {
498 if (sbp->sb_logsectsize != (1U << sbp->sb_logsectlog)) {
499 xfs_notice(mp,
500 "log sector size in bytes/log2 (0x%x/0x%x) must match",
501 sbp->sb_logsectsize, 1U << sbp->sb_logsectlog);
502 return -EFSCORRUPTED;
503 }
504 } else if (sbp->sb_logsectsize || sbp->sb_logsectlog) {
505 xfs_notice(mp,
506 "log sector size in bytes/log2 (0x%x/0x%x) are not zero",
507 sbp->sb_logsectsize, sbp->sb_logsectlog);
508 return -EFSCORRUPTED;
509 }
510
511 if (sbp->sb_logsunit > 1) {
512 if (sbp->sb_logsunit % sbp->sb_blocksize) {
513 xfs_notice(mp,
514 "log stripe unit 0x%x bytes must be a multiple of block size",
515 sbp->sb_logsunit);
516 return -EFSCORRUPTED;
517 }
518 if (sbp->sb_logsunit > XLOG_MAX_RECORD_BSIZE) {
519 xfs_notice(mp,
520 "log stripe unit 0x%x bytes over maximum size (0x%x bytes)",
521 sbp->sb_logsunit, XLOG_MAX_RECORD_BSIZE);
522 return -EFSCORRUPTED;
523 }
524 }
525
526 if (!xfs_validate_rt_geometry(sbp)) {
527 xfs_notice(mp,
528 "realtime %sgeometry check failed",
529 sbp->sb_rblocks ? "" : "zeroed ");
530 return -EFSCORRUPTED;
531 }
532
533 /*
534 * Either (sb_unit and !hasdalign) or (!sb_unit and hasdalign)
535 * would imply the image is corrupted.
536 */
537 has_dalign = sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT;
538 if (!!sbp->sb_unit ^ has_dalign) {
539 xfs_notice(mp, "SB stripe alignment sanity check failed");
540 return -EFSCORRUPTED;
541 }
542
543 if (!xfs_validate_stripe_geometry(mp, XFS_FSB_TO_B(mp, sbp->sb_unit),
544 XFS_FSB_TO_B(mp, sbp->sb_width), 0,
545 xfs_buf_daddr(bp) == XFS_SB_DADDR, false))
546 return -EFSCORRUPTED;
547
548 /*
549 * Currently only very few inode sizes are supported.
550 */
551 switch (sbp->sb_inodesize) {
552 case 256:
553 case 512:
554 case 1024:
555 case 2048:
556 break;
557 default:
558 xfs_warn(mp, "inode size of %d bytes not supported",
559 sbp->sb_inodesize);
560 return -ENOSYS;
561 }
562
563 return 0;
564 }
565
566 void
xfs_sb_quota_from_disk(struct xfs_sb * sbp)567 xfs_sb_quota_from_disk(struct xfs_sb *sbp)
568 {
569 /*
570 * older mkfs doesn't initialize quota inodes to NULLFSINO. This
571 * leads to in-core values having two different values for a quota
572 * inode to be invalid: 0 and NULLFSINO. Change it to a single value
573 * NULLFSINO.
574 *
575 * Note that this change affect only the in-core values. These
576 * values are not written back to disk unless any quota information
577 * is written to the disk. Even in that case, sb_pquotino field is
578 * not written to disk unless the superblock supports pquotino.
579 */
580 if (sbp->sb_uquotino == 0)
581 sbp->sb_uquotino = NULLFSINO;
582 if (sbp->sb_gquotino == 0)
583 sbp->sb_gquotino = NULLFSINO;
584 if (sbp->sb_pquotino == 0)
585 sbp->sb_pquotino = NULLFSINO;
586
587 /*
588 * We need to do these manipilations only if we are working
589 * with an older version of on-disk superblock.
590 */
591 if (xfs_sb_is_v5(sbp))
592 return;
593
594 if (sbp->sb_qflags & XFS_OQUOTA_ENFD)
595 sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ?
596 XFS_PQUOTA_ENFD : XFS_GQUOTA_ENFD;
597 if (sbp->sb_qflags & XFS_OQUOTA_CHKD)
598 sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ?
599 XFS_PQUOTA_CHKD : XFS_GQUOTA_CHKD;
600 sbp->sb_qflags &= ~(XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD);
601
602 if (sbp->sb_qflags & XFS_PQUOTA_ACCT &&
603 sbp->sb_gquotino != NULLFSINO) {
604 /*
605 * In older version of superblock, on-disk superblock only
606 * has sb_gquotino, and in-core superblock has both sb_gquotino
607 * and sb_pquotino. But, only one of them is supported at any
608 * point of time. So, if PQUOTA is set in disk superblock,
609 * copy over sb_gquotino to sb_pquotino. The NULLFSINO test
610 * above is to make sure we don't do this twice and wipe them
611 * both out!
612 */
613 sbp->sb_pquotino = sbp->sb_gquotino;
614 sbp->sb_gquotino = NULLFSINO;
615 }
616 }
617
618 static void
__xfs_sb_from_disk(struct xfs_sb * to,struct xfs_dsb * from,bool convert_xquota)619 __xfs_sb_from_disk(
620 struct xfs_sb *to,
621 struct xfs_dsb *from,
622 bool convert_xquota)
623 {
624 to->sb_magicnum = be32_to_cpu(from->sb_magicnum);
625 to->sb_blocksize = be32_to_cpu(from->sb_blocksize);
626 to->sb_dblocks = be64_to_cpu(from->sb_dblocks);
627 to->sb_rblocks = be64_to_cpu(from->sb_rblocks);
628 to->sb_rextents = be64_to_cpu(from->sb_rextents);
629 memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid));
630 to->sb_logstart = be64_to_cpu(from->sb_logstart);
631 to->sb_rootino = be64_to_cpu(from->sb_rootino);
632 to->sb_rbmino = be64_to_cpu(from->sb_rbmino);
633 to->sb_rsumino = be64_to_cpu(from->sb_rsumino);
634 to->sb_rextsize = be32_to_cpu(from->sb_rextsize);
635 to->sb_agblocks = be32_to_cpu(from->sb_agblocks);
636 to->sb_agcount = be32_to_cpu(from->sb_agcount);
637 to->sb_rbmblocks = be32_to_cpu(from->sb_rbmblocks);
638 to->sb_logblocks = be32_to_cpu(from->sb_logblocks);
639 to->sb_versionnum = be16_to_cpu(from->sb_versionnum);
640 to->sb_sectsize = be16_to_cpu(from->sb_sectsize);
641 to->sb_inodesize = be16_to_cpu(from->sb_inodesize);
642 to->sb_inopblock = be16_to_cpu(from->sb_inopblock);
643 memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname));
644 to->sb_blocklog = from->sb_blocklog;
645 to->sb_sectlog = from->sb_sectlog;
646 to->sb_inodelog = from->sb_inodelog;
647 to->sb_inopblog = from->sb_inopblog;
648 to->sb_agblklog = from->sb_agblklog;
649 to->sb_rextslog = from->sb_rextslog;
650 to->sb_inprogress = from->sb_inprogress;
651 to->sb_imax_pct = from->sb_imax_pct;
652 to->sb_icount = be64_to_cpu(from->sb_icount);
653 to->sb_ifree = be64_to_cpu(from->sb_ifree);
654 to->sb_fdblocks = be64_to_cpu(from->sb_fdblocks);
655 to->sb_frextents = be64_to_cpu(from->sb_frextents);
656 to->sb_uquotino = be64_to_cpu(from->sb_uquotino);
657 to->sb_gquotino = be64_to_cpu(from->sb_gquotino);
658 to->sb_qflags = be16_to_cpu(from->sb_qflags);
659 to->sb_flags = from->sb_flags;
660 to->sb_shared_vn = from->sb_shared_vn;
661 to->sb_inoalignmt = be32_to_cpu(from->sb_inoalignmt);
662 to->sb_unit = be32_to_cpu(from->sb_unit);
663 to->sb_width = be32_to_cpu(from->sb_width);
664 to->sb_dirblklog = from->sb_dirblklog;
665 to->sb_logsectlog = from->sb_logsectlog;
666 to->sb_logsectsize = be16_to_cpu(from->sb_logsectsize);
667 to->sb_logsunit = be32_to_cpu(from->sb_logsunit);
668 to->sb_features2 = be32_to_cpu(from->sb_features2);
669 to->sb_bad_features2 = be32_to_cpu(from->sb_bad_features2);
670 to->sb_features_compat = be32_to_cpu(from->sb_features_compat);
671 to->sb_features_ro_compat = be32_to_cpu(from->sb_features_ro_compat);
672 to->sb_features_incompat = be32_to_cpu(from->sb_features_incompat);
673 to->sb_features_log_incompat =
674 be32_to_cpu(from->sb_features_log_incompat);
675 /* crc is only used on disk, not in memory; just init to 0 here. */
676 to->sb_crc = 0;
677 to->sb_spino_align = be32_to_cpu(from->sb_spino_align);
678 to->sb_pquotino = be64_to_cpu(from->sb_pquotino);
679 to->sb_lsn = be64_to_cpu(from->sb_lsn);
680 /*
681 * sb_meta_uuid is only on disk if it differs from sb_uuid and the
682 * feature flag is set; if not set we keep it only in memory.
683 */
684 if (xfs_sb_is_v5(to) &&
685 (to->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID))
686 uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid);
687 else
688 uuid_copy(&to->sb_meta_uuid, &from->sb_uuid);
689 /* Convert on-disk flags to in-memory flags? */
690 if (convert_xquota)
691 xfs_sb_quota_from_disk(to);
692 }
693
694 void
xfs_sb_from_disk(struct xfs_sb * to,struct xfs_dsb * from)695 xfs_sb_from_disk(
696 struct xfs_sb *to,
697 struct xfs_dsb *from)
698 {
699 __xfs_sb_from_disk(to, from, true);
700 }
701
702 static void
xfs_sb_quota_to_disk(struct xfs_dsb * to,struct xfs_sb * from)703 xfs_sb_quota_to_disk(
704 struct xfs_dsb *to,
705 struct xfs_sb *from)
706 {
707 uint16_t qflags = from->sb_qflags;
708
709 to->sb_uquotino = cpu_to_be64(from->sb_uquotino);
710
711 /*
712 * The in-memory superblock quota state matches the v5 on-disk format so
713 * just write them out and return
714 */
715 if (xfs_sb_is_v5(from)) {
716 to->sb_qflags = cpu_to_be16(from->sb_qflags);
717 to->sb_gquotino = cpu_to_be64(from->sb_gquotino);
718 to->sb_pquotino = cpu_to_be64(from->sb_pquotino);
719 return;
720 }
721
722 /*
723 * For older superblocks (v4), the in-core version of sb_qflags do not
724 * have XFS_OQUOTA_* flags, whereas the on-disk version does. So,
725 * convert incore XFS_{PG}QUOTA_* flags to on-disk XFS_OQUOTA_* flags.
726 */
727 qflags &= ~(XFS_PQUOTA_ENFD | XFS_PQUOTA_CHKD |
728 XFS_GQUOTA_ENFD | XFS_GQUOTA_CHKD);
729
730 if (from->sb_qflags &
731 (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD))
732 qflags |= XFS_OQUOTA_ENFD;
733 if (from->sb_qflags &
734 (XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD))
735 qflags |= XFS_OQUOTA_CHKD;
736 to->sb_qflags = cpu_to_be16(qflags);
737
738 /*
739 * GQUOTINO and PQUOTINO cannot be used together in versions
740 * of superblock that do not have pquotino. from->sb_flags
741 * tells us which quota is active and should be copied to
742 * disk. If neither are active, we should NULL the inode.
743 *
744 * In all cases, the separate pquotino must remain 0 because it
745 * is beyond the "end" of the valid non-pquotino superblock.
746 */
747 if (from->sb_qflags & XFS_GQUOTA_ACCT)
748 to->sb_gquotino = cpu_to_be64(from->sb_gquotino);
749 else if (from->sb_qflags & XFS_PQUOTA_ACCT)
750 to->sb_gquotino = cpu_to_be64(from->sb_pquotino);
751 else {
752 /*
753 * We can't rely on just the fields being logged to tell us
754 * that it is safe to write NULLFSINO - we should only do that
755 * if quotas are not actually enabled. Hence only write
756 * NULLFSINO if both in-core quota inodes are NULL.
757 */
758 if (from->sb_gquotino == NULLFSINO &&
759 from->sb_pquotino == NULLFSINO)
760 to->sb_gquotino = cpu_to_be64(NULLFSINO);
761 }
762
763 to->sb_pquotino = 0;
764 }
765
766 void
xfs_sb_to_disk(struct xfs_dsb * to,struct xfs_sb * from)767 xfs_sb_to_disk(
768 struct xfs_dsb *to,
769 struct xfs_sb *from)
770 {
771 xfs_sb_quota_to_disk(to, from);
772
773 to->sb_magicnum = cpu_to_be32(from->sb_magicnum);
774 to->sb_blocksize = cpu_to_be32(from->sb_blocksize);
775 to->sb_dblocks = cpu_to_be64(from->sb_dblocks);
776 to->sb_rblocks = cpu_to_be64(from->sb_rblocks);
777 to->sb_rextents = cpu_to_be64(from->sb_rextents);
778 memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid));
779 to->sb_logstart = cpu_to_be64(from->sb_logstart);
780 to->sb_rootino = cpu_to_be64(from->sb_rootino);
781 to->sb_rbmino = cpu_to_be64(from->sb_rbmino);
782 to->sb_rsumino = cpu_to_be64(from->sb_rsumino);
783 to->sb_rextsize = cpu_to_be32(from->sb_rextsize);
784 to->sb_agblocks = cpu_to_be32(from->sb_agblocks);
785 to->sb_agcount = cpu_to_be32(from->sb_agcount);
786 to->sb_rbmblocks = cpu_to_be32(from->sb_rbmblocks);
787 to->sb_logblocks = cpu_to_be32(from->sb_logblocks);
788 to->sb_versionnum = cpu_to_be16(from->sb_versionnum);
789 to->sb_sectsize = cpu_to_be16(from->sb_sectsize);
790 to->sb_inodesize = cpu_to_be16(from->sb_inodesize);
791 to->sb_inopblock = cpu_to_be16(from->sb_inopblock);
792 memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname));
793 to->sb_blocklog = from->sb_blocklog;
794 to->sb_sectlog = from->sb_sectlog;
795 to->sb_inodelog = from->sb_inodelog;
796 to->sb_inopblog = from->sb_inopblog;
797 to->sb_agblklog = from->sb_agblklog;
798 to->sb_rextslog = from->sb_rextslog;
799 to->sb_inprogress = from->sb_inprogress;
800 to->sb_imax_pct = from->sb_imax_pct;
801 to->sb_icount = cpu_to_be64(from->sb_icount);
802 to->sb_ifree = cpu_to_be64(from->sb_ifree);
803 to->sb_fdblocks = cpu_to_be64(from->sb_fdblocks);
804 to->sb_frextents = cpu_to_be64(from->sb_frextents);
805
806 to->sb_flags = from->sb_flags;
807 to->sb_shared_vn = from->sb_shared_vn;
808 to->sb_inoalignmt = cpu_to_be32(from->sb_inoalignmt);
809 to->sb_unit = cpu_to_be32(from->sb_unit);
810 to->sb_width = cpu_to_be32(from->sb_width);
811 to->sb_dirblklog = from->sb_dirblklog;
812 to->sb_logsectlog = from->sb_logsectlog;
813 to->sb_logsectsize = cpu_to_be16(from->sb_logsectsize);
814 to->sb_logsunit = cpu_to_be32(from->sb_logsunit);
815
816 /*
817 * We need to ensure that bad_features2 always matches features2.
818 * Hence we enforce that here rather than having to remember to do it
819 * everywhere else that updates features2.
820 */
821 from->sb_bad_features2 = from->sb_features2;
822 to->sb_features2 = cpu_to_be32(from->sb_features2);
823 to->sb_bad_features2 = cpu_to_be32(from->sb_bad_features2);
824
825 if (!xfs_sb_is_v5(from))
826 return;
827
828 to->sb_features_compat = cpu_to_be32(from->sb_features_compat);
829 to->sb_features_ro_compat =
830 cpu_to_be32(from->sb_features_ro_compat);
831 to->sb_features_incompat =
832 cpu_to_be32(from->sb_features_incompat);
833 to->sb_features_log_incompat =
834 cpu_to_be32(from->sb_features_log_incompat);
835 to->sb_spino_align = cpu_to_be32(from->sb_spino_align);
836 to->sb_lsn = cpu_to_be64(from->sb_lsn);
837 if (from->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID)
838 uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid);
839 }
840
841 /*
842 * If the superblock has the CRC feature bit set or the CRC field is non-null,
843 * check that the CRC is valid. We check the CRC field is non-null because a
844 * single bit error could clear the feature bit and unused parts of the
845 * superblock are supposed to be zero. Hence a non-null crc field indicates that
846 * we've potentially lost a feature bit and we should check it anyway.
847 *
848 * However, past bugs (i.e. in growfs) left non-zeroed regions beyond the
849 * last field in V4 secondary superblocks. So for secondary superblocks,
850 * we are more forgiving, and ignore CRC failures if the primary doesn't
851 * indicate that the fs version is V5.
852 */
853 static void
xfs_sb_read_verify(struct xfs_buf * bp)854 xfs_sb_read_verify(
855 struct xfs_buf *bp)
856 {
857 struct xfs_sb sb;
858 struct xfs_mount *mp = bp->b_mount;
859 struct xfs_dsb *dsb = bp->b_addr;
860 int error;
861
862 /*
863 * open code the version check to avoid needing to convert the entire
864 * superblock from disk order just to check the version number
865 */
866 if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC) &&
867 (((be16_to_cpu(dsb->sb_versionnum) & XFS_SB_VERSION_NUMBITS) ==
868 XFS_SB_VERSION_5) ||
869 dsb->sb_crc != 0)) {
870
871 if (!xfs_buf_verify_cksum(bp, XFS_SB_CRC_OFF)) {
872 /* Only fail bad secondaries on a known V5 filesystem */
873 if (xfs_buf_daddr(bp) == XFS_SB_DADDR ||
874 xfs_has_crc(mp)) {
875 error = -EFSBADCRC;
876 goto out_error;
877 }
878 }
879 }
880
881 /*
882 * Check all the superblock fields. Don't byteswap the xquota flags
883 * because _verify_common checks the on-disk values.
884 */
885 __xfs_sb_from_disk(&sb, dsb, false);
886 error = xfs_validate_sb_common(mp, bp, &sb);
887 if (error)
888 goto out_error;
889 error = xfs_validate_sb_read(mp, &sb);
890
891 out_error:
892 if (error == -EFSCORRUPTED || error == -EFSBADCRC)
893 xfs_verifier_error(bp, error, __this_address);
894 else if (error)
895 xfs_buf_ioerror(bp, error);
896 }
897
898 /*
899 * We may be probed for a filesystem match, so we may not want to emit
900 * messages when the superblock buffer is not actually an XFS superblock.
901 * If we find an XFS superblock, then run a normal, noisy mount because we are
902 * really going to mount it and want to know about errors.
903 */
904 static void
xfs_sb_quiet_read_verify(struct xfs_buf * bp)905 xfs_sb_quiet_read_verify(
906 struct xfs_buf *bp)
907 {
908 struct xfs_dsb *dsb = bp->b_addr;
909
910 if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC)) {
911 /* XFS filesystem, verify noisily! */
912 xfs_sb_read_verify(bp);
913 return;
914 }
915 /* quietly fail */
916 xfs_buf_ioerror(bp, -EWRONGFS);
917 }
918
919 static void
xfs_sb_write_verify(struct xfs_buf * bp)920 xfs_sb_write_verify(
921 struct xfs_buf *bp)
922 {
923 struct xfs_sb sb;
924 struct xfs_mount *mp = bp->b_mount;
925 struct xfs_buf_log_item *bip = bp->b_log_item;
926 struct xfs_dsb *dsb = bp->b_addr;
927 int error;
928
929 /*
930 * Check all the superblock fields. Don't byteswap the xquota flags
931 * because _verify_common checks the on-disk values.
932 */
933 __xfs_sb_from_disk(&sb, dsb, false);
934 error = xfs_validate_sb_common(mp, bp, &sb);
935 if (error)
936 goto out_error;
937 error = xfs_validate_sb_write(mp, bp, &sb);
938 if (error)
939 goto out_error;
940
941 if (!xfs_sb_is_v5(&sb))
942 return;
943
944 if (bip)
945 dsb->sb_lsn = cpu_to_be64(bip->bli_item.li_lsn);
946
947 xfs_buf_update_cksum(bp, XFS_SB_CRC_OFF);
948 return;
949
950 out_error:
951 xfs_verifier_error(bp, error, __this_address);
952 }
953
954 const struct xfs_buf_ops xfs_sb_buf_ops = {
955 .name = "xfs_sb",
956 .magic = { cpu_to_be32(XFS_SB_MAGIC), cpu_to_be32(XFS_SB_MAGIC) },
957 .verify_read = xfs_sb_read_verify,
958 .verify_write = xfs_sb_write_verify,
959 };
960
961 const struct xfs_buf_ops xfs_sb_quiet_buf_ops = {
962 .name = "xfs_sb_quiet",
963 .magic = { cpu_to_be32(XFS_SB_MAGIC), cpu_to_be32(XFS_SB_MAGIC) },
964 .verify_read = xfs_sb_quiet_read_verify,
965 .verify_write = xfs_sb_write_verify,
966 };
967
968 void
xfs_mount_sb_set_rextsize(struct xfs_mount * mp,struct xfs_sb * sbp)969 xfs_mount_sb_set_rextsize(
970 struct xfs_mount *mp,
971 struct xfs_sb *sbp)
972 {
973 mp->m_rtxblklog = log2_if_power2(sbp->sb_rextsize);
974 mp->m_rtxblkmask = mask64_if_power2(sbp->sb_rextsize);
975 }
976
977 /*
978 * xfs_mount_common
979 *
980 * Mount initialization code establishing various mount
981 * fields from the superblock associated with the given
982 * mount structure.
983 *
984 * Inode geometry are calculated in xfs_ialloc_setup_geometry.
985 */
986 void
xfs_sb_mount_common(struct xfs_mount * mp,struct xfs_sb * sbp)987 xfs_sb_mount_common(
988 struct xfs_mount *mp,
989 struct xfs_sb *sbp)
990 {
991 mp->m_agfrotor = 0;
992 atomic_set(&mp->m_agirotor, 0);
993 mp->m_maxagi = mp->m_sb.sb_agcount;
994 mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG;
995 mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT;
996 mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT;
997 mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1;
998 mp->m_blockmask = sbp->sb_blocksize - 1;
999 mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG;
1000 mp->m_blockwmask = mp->m_blockwsize - 1;
1001 xfs_mount_sb_set_rextsize(mp, sbp);
1002
1003 mp->m_alloc_mxr[0] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, true);
1004 mp->m_alloc_mxr[1] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, false);
1005 mp->m_alloc_mnr[0] = mp->m_alloc_mxr[0] / 2;
1006 mp->m_alloc_mnr[1] = mp->m_alloc_mxr[1] / 2;
1007
1008 mp->m_bmap_dmxr[0] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, true);
1009 mp->m_bmap_dmxr[1] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, false);
1010 mp->m_bmap_dmnr[0] = mp->m_bmap_dmxr[0] / 2;
1011 mp->m_bmap_dmnr[1] = mp->m_bmap_dmxr[1] / 2;
1012
1013 mp->m_rmap_mxr[0] = xfs_rmapbt_maxrecs(mp, sbp->sb_blocksize, true);
1014 mp->m_rmap_mxr[1] = xfs_rmapbt_maxrecs(mp, sbp->sb_blocksize, false);
1015 mp->m_rmap_mnr[0] = mp->m_rmap_mxr[0] / 2;
1016 mp->m_rmap_mnr[1] = mp->m_rmap_mxr[1] / 2;
1017
1018 mp->m_refc_mxr[0] = xfs_refcountbt_maxrecs(mp, sbp->sb_blocksize, true);
1019 mp->m_refc_mxr[1] = xfs_refcountbt_maxrecs(mp, sbp->sb_blocksize, false);
1020 mp->m_refc_mnr[0] = mp->m_refc_mxr[0] / 2;
1021 mp->m_refc_mnr[1] = mp->m_refc_mxr[1] / 2;
1022
1023 mp->m_bsize = XFS_FSB_TO_BB(mp, 1);
1024 mp->m_alloc_set_aside = xfs_alloc_set_aside(mp);
1025 mp->m_ag_max_usable = xfs_alloc_ag_max_usable(mp);
1026 }
1027
1028 /*
1029 * xfs_log_sb() can be used to copy arbitrary changes to the in-core superblock
1030 * into the superblock buffer to be logged. It does not provide the higher
1031 * level of locking that is needed to protect the in-core superblock from
1032 * concurrent access.
1033 */
1034 void
xfs_log_sb(struct xfs_trans * tp)1035 xfs_log_sb(
1036 struct xfs_trans *tp)
1037 {
1038 struct xfs_mount *mp = tp->t_mountp;
1039 struct xfs_buf *bp = xfs_trans_getsb(tp);
1040
1041 /*
1042 * Lazy sb counters don't update the in-core superblock so do that now.
1043 * If this is at unmount, the counters will be exactly correct, but at
1044 * any other time they will only be ballpark correct because of
1045 * reservations that have been taken out percpu counters. If we have an
1046 * unclean shutdown, this will be corrected by log recovery rebuilding
1047 * the counters from the AGF block counts.
1048 *
1049 * Do not update sb_frextents here because it is not part of the lazy
1050 * sb counters, despite having a percpu counter. It is always kept
1051 * consistent with the ondisk rtbitmap by xfs_trans_apply_sb_deltas()
1052 * and hence we don't need have to update it here.
1053 */
1054 if (xfs_has_lazysbcount(mp)) {
1055 mp->m_sb.sb_icount = percpu_counter_sum_positive(&mp->m_icount);
1056 mp->m_sb.sb_ifree = min_t(uint64_t,
1057 percpu_counter_sum_positive(&mp->m_ifree),
1058 mp->m_sb.sb_icount);
1059 mp->m_sb.sb_fdblocks =
1060 percpu_counter_sum_positive(&mp->m_fdblocks);
1061 }
1062
1063 xfs_sb_to_disk(bp->b_addr, &mp->m_sb);
1064 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF);
1065 xfs_trans_log_buf(tp, bp, 0, sizeof(struct xfs_dsb) - 1);
1066 }
1067
1068 /*
1069 * xfs_sync_sb
1070 *
1071 * Sync the superblock to disk.
1072 *
1073 * Note that the caller is responsible for checking the frozen state of the
1074 * filesystem. This procedure uses the non-blocking transaction allocator and
1075 * thus will allow modifications to a frozen fs. This is required because this
1076 * code can be called during the process of freezing where use of the high-level
1077 * allocator would deadlock.
1078 */
1079 int
xfs_sync_sb(struct xfs_mount * mp,bool wait)1080 xfs_sync_sb(
1081 struct xfs_mount *mp,
1082 bool wait)
1083 {
1084 struct xfs_trans *tp;
1085 int error;
1086
1087 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_sb, 0, 0,
1088 XFS_TRANS_NO_WRITECOUNT, &tp);
1089 if (error)
1090 return error;
1091
1092 xfs_log_sb(tp);
1093 if (wait)
1094 xfs_trans_set_sync(tp);
1095 return xfs_trans_commit(tp);
1096 }
1097
1098 /*
1099 * Update all the secondary superblocks to match the new state of the primary.
1100 * Because we are completely overwriting all the existing fields in the
1101 * secondary superblock buffers, there is no need to read them in from disk.
1102 * Just get a new buffer, stamp it and write it.
1103 *
1104 * The sb buffers need to be cached here so that we serialise against other
1105 * operations that access the secondary superblocks, but we don't want to keep
1106 * them in memory once it is written so we mark it as a one-shot buffer.
1107 */
1108 int
xfs_update_secondary_sbs(struct xfs_mount * mp)1109 xfs_update_secondary_sbs(
1110 struct xfs_mount *mp)
1111 {
1112 struct xfs_perag *pag;
1113 xfs_agnumber_t agno = 1;
1114 int saved_error = 0;
1115 int error = 0;
1116 LIST_HEAD (buffer_list);
1117
1118 /* update secondary superblocks. */
1119 for_each_perag_from(mp, agno, pag) {
1120 struct xfs_buf *bp;
1121
1122 error = xfs_buf_get(mp->m_ddev_targp,
1123 XFS_AG_DADDR(mp, pag->pag_agno, XFS_SB_DADDR),
1124 XFS_FSS_TO_BB(mp, 1), &bp);
1125 /*
1126 * If we get an error reading or writing alternate superblocks,
1127 * continue. xfs_repair chooses the "best" superblock based
1128 * on most matches; if we break early, we'll leave more
1129 * superblocks un-updated than updated, and xfs_repair may
1130 * pick them over the properly-updated primary.
1131 */
1132 if (error) {
1133 xfs_warn(mp,
1134 "error allocating secondary superblock for ag %d",
1135 pag->pag_agno);
1136 if (!saved_error)
1137 saved_error = error;
1138 continue;
1139 }
1140
1141 bp->b_ops = &xfs_sb_buf_ops;
1142 xfs_buf_oneshot(bp);
1143 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
1144 xfs_sb_to_disk(bp->b_addr, &mp->m_sb);
1145 xfs_buf_delwri_queue(bp, &buffer_list);
1146 xfs_buf_relse(bp);
1147
1148 /* don't hold too many buffers at once */
1149 if (agno % 16)
1150 continue;
1151
1152 error = xfs_buf_delwri_submit(&buffer_list);
1153 if (error) {
1154 xfs_warn(mp,
1155 "write error %d updating a secondary superblock near ag %d",
1156 error, pag->pag_agno);
1157 if (!saved_error)
1158 saved_error = error;
1159 continue;
1160 }
1161 }
1162 error = xfs_buf_delwri_submit(&buffer_list);
1163 if (error) {
1164 xfs_warn(mp,
1165 "write error %d updating a secondary superblock near ag %d",
1166 error, agno);
1167 }
1168
1169 return saved_error ? saved_error : error;
1170 }
1171
1172 /*
1173 * Same behavior as xfs_sync_sb, except that it is always synchronous and it
1174 * also writes the superblock buffer to disk sector 0 immediately.
1175 */
1176 int
xfs_sync_sb_buf(struct xfs_mount * mp)1177 xfs_sync_sb_buf(
1178 struct xfs_mount *mp)
1179 {
1180 struct xfs_trans *tp;
1181 struct xfs_buf *bp;
1182 int error;
1183
1184 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_sb, 0, 0, 0, &tp);
1185 if (error)
1186 return error;
1187
1188 bp = xfs_trans_getsb(tp);
1189 xfs_log_sb(tp);
1190 xfs_trans_bhold(tp, bp);
1191 xfs_trans_set_sync(tp);
1192 error = xfs_trans_commit(tp);
1193 if (error)
1194 goto out;
1195 /*
1196 * write out the sb buffer to get the changes to disk
1197 */
1198 error = xfs_bwrite(bp);
1199 out:
1200 xfs_buf_relse(bp);
1201 return error;
1202 }
1203
1204 void
xfs_fs_geometry(struct xfs_mount * mp,struct xfs_fsop_geom * geo,int struct_version)1205 xfs_fs_geometry(
1206 struct xfs_mount *mp,
1207 struct xfs_fsop_geom *geo,
1208 int struct_version)
1209 {
1210 struct xfs_sb *sbp = &mp->m_sb;
1211
1212 memset(geo, 0, sizeof(struct xfs_fsop_geom));
1213
1214 geo->blocksize = sbp->sb_blocksize;
1215 geo->rtextsize = sbp->sb_rextsize;
1216 geo->agblocks = sbp->sb_agblocks;
1217 geo->agcount = sbp->sb_agcount;
1218 geo->logblocks = sbp->sb_logblocks;
1219 geo->sectsize = sbp->sb_sectsize;
1220 geo->inodesize = sbp->sb_inodesize;
1221 geo->imaxpct = sbp->sb_imax_pct;
1222 geo->datablocks = sbp->sb_dblocks;
1223 geo->rtblocks = sbp->sb_rblocks;
1224 geo->rtextents = sbp->sb_rextents;
1225 geo->logstart = sbp->sb_logstart;
1226 BUILD_BUG_ON(sizeof(geo->uuid) != sizeof(sbp->sb_uuid));
1227 memcpy(geo->uuid, &sbp->sb_uuid, sizeof(sbp->sb_uuid));
1228
1229 if (struct_version < 2)
1230 return;
1231
1232 geo->sunit = sbp->sb_unit;
1233 geo->swidth = sbp->sb_width;
1234
1235 if (struct_version < 3)
1236 return;
1237
1238 geo->version = XFS_FSOP_GEOM_VERSION;
1239 geo->flags = XFS_FSOP_GEOM_FLAGS_NLINK |
1240 XFS_FSOP_GEOM_FLAGS_DIRV2 |
1241 XFS_FSOP_GEOM_FLAGS_EXTFLG;
1242 if (xfs_has_attr(mp))
1243 geo->flags |= XFS_FSOP_GEOM_FLAGS_ATTR;
1244 if (xfs_has_quota(mp))
1245 geo->flags |= XFS_FSOP_GEOM_FLAGS_QUOTA;
1246 if (xfs_has_align(mp))
1247 geo->flags |= XFS_FSOP_GEOM_FLAGS_IALIGN;
1248 if (xfs_has_dalign(mp))
1249 geo->flags |= XFS_FSOP_GEOM_FLAGS_DALIGN;
1250 if (xfs_has_asciici(mp))
1251 geo->flags |= XFS_FSOP_GEOM_FLAGS_DIRV2CI;
1252 if (xfs_has_lazysbcount(mp))
1253 geo->flags |= XFS_FSOP_GEOM_FLAGS_LAZYSB;
1254 if (xfs_has_attr2(mp))
1255 geo->flags |= XFS_FSOP_GEOM_FLAGS_ATTR2;
1256 if (xfs_has_projid32(mp))
1257 geo->flags |= XFS_FSOP_GEOM_FLAGS_PROJID32;
1258 if (xfs_has_crc(mp))
1259 geo->flags |= XFS_FSOP_GEOM_FLAGS_V5SB;
1260 if (xfs_has_ftype(mp))
1261 geo->flags |= XFS_FSOP_GEOM_FLAGS_FTYPE;
1262 if (xfs_has_finobt(mp))
1263 geo->flags |= XFS_FSOP_GEOM_FLAGS_FINOBT;
1264 if (xfs_has_sparseinodes(mp))
1265 geo->flags |= XFS_FSOP_GEOM_FLAGS_SPINODES;
1266 if (xfs_has_rmapbt(mp))
1267 geo->flags |= XFS_FSOP_GEOM_FLAGS_RMAPBT;
1268 if (xfs_has_reflink(mp))
1269 geo->flags |= XFS_FSOP_GEOM_FLAGS_REFLINK;
1270 if (xfs_has_bigtime(mp))
1271 geo->flags |= XFS_FSOP_GEOM_FLAGS_BIGTIME;
1272 if (xfs_has_inobtcounts(mp))
1273 geo->flags |= XFS_FSOP_GEOM_FLAGS_INOBTCNT;
1274 if (xfs_has_parent(mp))
1275 geo->flags |= XFS_FSOP_GEOM_FLAGS_PARENT;
1276 if (xfs_has_sector(mp)) {
1277 geo->flags |= XFS_FSOP_GEOM_FLAGS_SECTOR;
1278 geo->logsectsize = sbp->sb_logsectsize;
1279 } else {
1280 geo->logsectsize = BBSIZE;
1281 }
1282 if (xfs_has_large_extent_counts(mp))
1283 geo->flags |= XFS_FSOP_GEOM_FLAGS_NREXT64;
1284 if (xfs_has_exchange_range(mp))
1285 geo->flags |= XFS_FSOP_GEOM_FLAGS_EXCHANGE_RANGE;
1286 geo->rtsectsize = sbp->sb_blocksize;
1287 geo->dirblocksize = xfs_dir2_dirblock_bytes(sbp);
1288
1289 if (struct_version < 4)
1290 return;
1291
1292 if (xfs_has_logv2(mp))
1293 geo->flags |= XFS_FSOP_GEOM_FLAGS_LOGV2;
1294
1295 geo->logsunit = sbp->sb_logsunit;
1296
1297 if (struct_version < 5)
1298 return;
1299
1300 geo->version = XFS_FSOP_GEOM_VERSION_V5;
1301 }
1302
1303 /* Read a secondary superblock. */
1304 int
xfs_sb_read_secondary(struct xfs_mount * mp,struct xfs_trans * tp,xfs_agnumber_t agno,struct xfs_buf ** bpp)1305 xfs_sb_read_secondary(
1306 struct xfs_mount *mp,
1307 struct xfs_trans *tp,
1308 xfs_agnumber_t agno,
1309 struct xfs_buf **bpp)
1310 {
1311 struct xfs_buf *bp;
1312 int error;
1313
1314 ASSERT(agno != 0 && agno != NULLAGNUMBER);
1315 error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
1316 XFS_AG_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
1317 XFS_FSS_TO_BB(mp, 1), 0, &bp, &xfs_sb_buf_ops);
1318 if (xfs_metadata_is_sick(error))
1319 xfs_agno_mark_sick(mp, agno, XFS_SICK_AG_SB);
1320 if (error)
1321 return error;
1322 xfs_buf_set_ref(bp, XFS_SSB_REF);
1323 *bpp = bp;
1324 return 0;
1325 }
1326
1327 /* Get an uninitialised secondary superblock buffer. */
1328 int
xfs_sb_get_secondary(struct xfs_mount * mp,struct xfs_trans * tp,xfs_agnumber_t agno,struct xfs_buf ** bpp)1329 xfs_sb_get_secondary(
1330 struct xfs_mount *mp,
1331 struct xfs_trans *tp,
1332 xfs_agnumber_t agno,
1333 struct xfs_buf **bpp)
1334 {
1335 struct xfs_buf *bp;
1336 int error;
1337
1338 ASSERT(agno != 0 && agno != NULLAGNUMBER);
1339 error = xfs_trans_get_buf(tp, mp->m_ddev_targp,
1340 XFS_AG_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
1341 XFS_FSS_TO_BB(mp, 1), 0, &bp);
1342 if (error)
1343 return error;
1344 bp->b_ops = &xfs_sb_buf_ops;
1345 xfs_buf_oneshot(bp);
1346 *bpp = bp;
1347 return 0;
1348 }
1349
1350 /*
1351 * sunit, swidth, sectorsize(optional with 0) should be all in bytes, so users
1352 * won't be confused by values in error messages. This function returns false
1353 * if the stripe geometry is invalid and the caller is unable to repair the
1354 * stripe configuration later in the mount process.
1355 */
1356 bool
xfs_validate_stripe_geometry(struct xfs_mount * mp,__s64 sunit,__s64 swidth,int sectorsize,bool may_repair,bool silent)1357 xfs_validate_stripe_geometry(
1358 struct xfs_mount *mp,
1359 __s64 sunit,
1360 __s64 swidth,
1361 int sectorsize,
1362 bool may_repair,
1363 bool silent)
1364 {
1365 if (swidth > INT_MAX) {
1366 if (!silent)
1367 xfs_notice(mp,
1368 "stripe width (%lld) is too large", swidth);
1369 goto check_override;
1370 }
1371
1372 if (sunit > swidth) {
1373 if (!silent)
1374 xfs_notice(mp,
1375 "stripe unit (%lld) is larger than the stripe width (%lld)", sunit, swidth);
1376 goto check_override;
1377 }
1378
1379 if (sectorsize && (int)sunit % sectorsize) {
1380 if (!silent)
1381 xfs_notice(mp,
1382 "stripe unit (%lld) must be a multiple of the sector size (%d)",
1383 sunit, sectorsize);
1384 goto check_override;
1385 }
1386
1387 if (sunit && !swidth) {
1388 if (!silent)
1389 xfs_notice(mp,
1390 "invalid stripe unit (%lld) and stripe width of 0", sunit);
1391 goto check_override;
1392 }
1393
1394 if (!sunit && swidth) {
1395 if (!silent)
1396 xfs_notice(mp,
1397 "invalid stripe width (%lld) and stripe unit of 0", swidth);
1398 goto check_override;
1399 }
1400
1401 if (sunit && (int)swidth % (int)sunit) {
1402 if (!silent)
1403 xfs_notice(mp,
1404 "stripe width (%lld) must be a multiple of the stripe unit (%lld)",
1405 swidth, sunit);
1406 goto check_override;
1407 }
1408 return true;
1409
1410 check_override:
1411 if (!may_repair)
1412 return false;
1413 /*
1414 * During mount, mp->m_dalign will not be set unless the sunit mount
1415 * option was set. If it was set, ignore the bad stripe alignment values
1416 * and allow the validation and overwrite later in the mount process to
1417 * attempt to overwrite the bad stripe alignment values with the values
1418 * supplied by mount options.
1419 */
1420 if (!mp->m_dalign)
1421 return false;
1422 if (!silent)
1423 xfs_notice(mp,
1424 "Will try to correct with specified mount options sunit (%d) and swidth (%d)",
1425 BBTOB(mp->m_dalign), BBTOB(mp->m_swidth));
1426 return true;
1427 }
1428
1429 /*
1430 * Compute the maximum level number of the realtime summary file, as defined by
1431 * mkfs. The historic use of highbit32 on a 64-bit quantity prohibited correct
1432 * use of rt volumes with more than 2^32 extents.
1433 */
1434 uint8_t
xfs_compute_rextslog(xfs_rtbxlen_t rtextents)1435 xfs_compute_rextslog(
1436 xfs_rtbxlen_t rtextents)
1437 {
1438 if (!rtextents)
1439 return 0;
1440 return xfs_highbit64(rtextents);
1441 }
1442