2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 #include "xfs_shared.h"
21 #include "xfs_format.h"
22 #include "xfs_log_format.h"
23 #include "xfs_trans_resv.h"
26 #include "xfs_mount.h"
27 #include "xfs_inode.h"
28 #include "xfs_ialloc.h"
29 #include "xfs_alloc.h"
30 #include "xfs_error.h"
31 #include "xfs_trace.h"
32 #include "xfs_cksum.h"
33 #include "xfs_trans.h"
34 #include "xfs_buf_item.h"
35 #include "xfs_bmap_btree.h"
36 #include "xfs_alloc_btree.h"
37 #include "xfs_ialloc_btree.h"
40 * Physical superblock buffer manipulations. Shared with libxfs in userspace.
44 * Reference counting access wrappers to the perag structures.
45 * Because we never free per-ag structures, the only thing we
46 * have to protect against changes is the tree structure itself.
53 struct xfs_perag
*pag
;
57 pag
= radix_tree_lookup(&mp
->m_perag_tree
, agno
);
59 ASSERT(atomic_read(&pag
->pag_ref
) >= 0);
60 ref
= atomic_inc_return(&pag
->pag_ref
);
63 trace_xfs_perag_get(mp
, agno
, ref
, _RET_IP_
);
68 * search from @first to find the next perag with the given tag set.
76 struct xfs_perag
*pag
;
81 found
= radix_tree_gang_lookup_tag(&mp
->m_perag_tree
,
82 (void **)&pag
, first
, 1, tag
);
87 ref
= atomic_inc_return(&pag
->pag_ref
);
89 trace_xfs_perag_get_tag(mp
, pag
->pag_agno
, ref
, _RET_IP_
);
95 struct xfs_perag
*pag
)
99 ASSERT(atomic_read(&pag
->pag_ref
) > 0);
100 ref
= atomic_dec_return(&pag
->pag_ref
);
101 trace_xfs_perag_put(pag
->pag_mount
, pag
->pag_agno
, ref
, _RET_IP_
);
105 * Check the validity of the SB found.
108 xfs_mount_validate_sb(
111 bool check_inprogress
,
114 if (sbp
->sb_magicnum
!= XFS_SB_MAGIC
) {
115 xfs_warn(mp
, "bad magic number");
120 if (!xfs_sb_good_version(sbp
)) {
121 xfs_warn(mp
, "bad version");
126 * Version 5 superblock feature mask validation. Reject combinations the
127 * kernel cannot support up front before checking anything else. For
128 * write validation, we don't need to check feature masks.
130 if (check_version
&& XFS_SB_VERSION_NUM(sbp
) == XFS_SB_VERSION_5
) {
131 if (xfs_sb_has_compat_feature(sbp
,
132 XFS_SB_FEAT_COMPAT_UNKNOWN
)) {
134 "Superblock has unknown compatible features (0x%x) enabled.",
135 (sbp
->sb_features_compat
&
136 XFS_SB_FEAT_COMPAT_UNKNOWN
));
138 "Using a more recent kernel is recommended.");
141 if (xfs_sb_has_ro_compat_feature(sbp
,
142 XFS_SB_FEAT_RO_COMPAT_UNKNOWN
)) {
144 "Superblock has unknown read-only compatible features (0x%x) enabled.",
145 (sbp
->sb_features_ro_compat
&
146 XFS_SB_FEAT_RO_COMPAT_UNKNOWN
));
147 if (!(mp
->m_flags
& XFS_MOUNT_RDONLY
)) {
149 "Attempted to mount read-only compatible filesystem read-write.");
151 "Filesystem can only be safely mounted read only.");
156 if (xfs_sb_has_incompat_feature(sbp
,
157 XFS_SB_FEAT_INCOMPAT_UNKNOWN
)) {
159 "Superblock has unknown incompatible features (0x%x) enabled.",
160 (sbp
->sb_features_incompat
&
161 XFS_SB_FEAT_INCOMPAT_UNKNOWN
));
163 "Filesystem can not be safely mounted by this kernel.");
168 if (xfs_sb_version_has_pquotino(sbp
)) {
169 if (sbp
->sb_qflags
& (XFS_OQUOTA_ENFD
| XFS_OQUOTA_CHKD
)) {
171 "Version 5 of Super block has XFS_OQUOTA bits.");
172 return -EFSCORRUPTED
;
174 } else if (sbp
->sb_qflags
& (XFS_PQUOTA_ENFD
| XFS_GQUOTA_ENFD
|
175 XFS_PQUOTA_CHKD
| XFS_GQUOTA_CHKD
)) {
177 "Superblock earlier than Version 5 has XFS_[PQ]UOTA_{ENFD|CHKD} bits.");
178 return -EFSCORRUPTED
;
182 * Full inode chunks must be aligned to inode chunk size when
183 * sparse inodes are enabled to support the sparse chunk
184 * allocation algorithm and prevent overlapping inode records.
186 if (xfs_sb_version_hassparseinodes(sbp
)) {
189 align
= XFS_INODES_PER_CHUNK
* sbp
->sb_inodesize
191 if (sbp
->sb_inoalignmt
!= align
) {
193 "Inode block alignment (%u) must match chunk size (%u) for sparse inodes.",
194 sbp
->sb_inoalignmt
, align
);
200 sbp
->sb_logstart
== 0 && mp
->m_logdev_targp
== mp
->m_ddev_targp
)) {
202 "filesystem is marked as having an external log; "
203 "specify logdev on the mount command line.");
208 sbp
->sb_logstart
!= 0 && mp
->m_logdev_targp
!= mp
->m_ddev_targp
)) {
210 "filesystem is marked as having an internal log; "
211 "do not specify logdev on the mount command line.");
216 * More sanity checking. Most of these were stolen directly from
220 sbp
->sb_agcount
<= 0 ||
221 sbp
->sb_sectsize
< XFS_MIN_SECTORSIZE
||
222 sbp
->sb_sectsize
> XFS_MAX_SECTORSIZE
||
223 sbp
->sb_sectlog
< XFS_MIN_SECTORSIZE_LOG
||
224 sbp
->sb_sectlog
> XFS_MAX_SECTORSIZE_LOG
||
225 sbp
->sb_sectsize
!= (1 << sbp
->sb_sectlog
) ||
226 sbp
->sb_blocksize
< XFS_MIN_BLOCKSIZE
||
227 sbp
->sb_blocksize
> XFS_MAX_BLOCKSIZE
||
228 sbp
->sb_blocklog
< XFS_MIN_BLOCKSIZE_LOG
||
229 sbp
->sb_blocklog
> XFS_MAX_BLOCKSIZE_LOG
||
230 sbp
->sb_blocksize
!= (1 << sbp
->sb_blocklog
) ||
231 sbp
->sb_dirblklog
> XFS_MAX_BLOCKSIZE_LOG
||
232 sbp
->sb_inodesize
< XFS_DINODE_MIN_SIZE
||
233 sbp
->sb_inodesize
> XFS_DINODE_MAX_SIZE
||
234 sbp
->sb_inodelog
< XFS_DINODE_MIN_LOG
||
235 sbp
->sb_inodelog
> XFS_DINODE_MAX_LOG
||
236 sbp
->sb_inodesize
!= (1 << sbp
->sb_inodelog
) ||
237 sbp
->sb_logsunit
> XLOG_MAX_RECORD_BSIZE
||
238 sbp
->sb_inopblock
!= howmany(sbp
->sb_blocksize
,sbp
->sb_inodesize
) ||
239 (sbp
->sb_blocklog
- sbp
->sb_inodelog
!= sbp
->sb_inopblog
) ||
240 (sbp
->sb_rextsize
* sbp
->sb_blocksize
> XFS_MAX_RTEXTSIZE
) ||
241 (sbp
->sb_rextsize
* sbp
->sb_blocksize
< XFS_MIN_RTEXTSIZE
) ||
242 (sbp
->sb_imax_pct
> 100 /* zero sb_imax_pct is valid */) ||
243 sbp
->sb_dblocks
== 0 ||
244 sbp
->sb_dblocks
> XFS_MAX_DBLOCKS(sbp
) ||
245 sbp
->sb_dblocks
< XFS_MIN_DBLOCKS(sbp
) ||
246 sbp
->sb_shared_vn
!= 0)) {
247 xfs_notice(mp
, "SB sanity check failed");
248 return -EFSCORRUPTED
;
252 * Until this is fixed only page-sized or smaller data blocks work.
254 if (unlikely(sbp
->sb_blocksize
> PAGE_SIZE
)) {
256 "File system with blocksize %d bytes. "
257 "Only pagesize (%ld) or less will currently work.",
258 sbp
->sb_blocksize
, PAGE_SIZE
);
263 * Currently only very few inode sizes are supported.
265 switch (sbp
->sb_inodesize
) {
272 xfs_warn(mp
, "inode size of %d bytes not supported",
277 if (xfs_sb_validate_fsb_count(sbp
, sbp
->sb_dblocks
) ||
278 xfs_sb_validate_fsb_count(sbp
, sbp
->sb_rblocks
)) {
280 "file system too large to be mounted on this system.");
284 if (check_inprogress
&& sbp
->sb_inprogress
) {
285 xfs_warn(mp
, "Offline file system operation in progress!");
286 return -EFSCORRUPTED
;
292 xfs_sb_quota_from_disk(struct xfs_sb
*sbp
)
295 * older mkfs doesn't initialize quota inodes to NULLFSINO. This
296 * leads to in-core values having two different values for a quota
297 * inode to be invalid: 0 and NULLFSINO. Change it to a single value
300 * Note that this change affect only the in-core values. These
301 * values are not written back to disk unless any quota information
302 * is written to the disk. Even in that case, sb_pquotino field is
303 * not written to disk unless the superblock supports pquotino.
305 if (sbp
->sb_uquotino
== 0)
306 sbp
->sb_uquotino
= NULLFSINO
;
307 if (sbp
->sb_gquotino
== 0)
308 sbp
->sb_gquotino
= NULLFSINO
;
309 if (sbp
->sb_pquotino
== 0)
310 sbp
->sb_pquotino
= NULLFSINO
;
313 * We need to do these manipilations only if we are working
314 * with an older version of on-disk superblock.
316 if (xfs_sb_version_has_pquotino(sbp
))
319 if (sbp
->sb_qflags
& XFS_OQUOTA_ENFD
)
320 sbp
->sb_qflags
|= (sbp
->sb_qflags
& XFS_PQUOTA_ACCT
) ?
321 XFS_PQUOTA_ENFD
: XFS_GQUOTA_ENFD
;
322 if (sbp
->sb_qflags
& XFS_OQUOTA_CHKD
)
323 sbp
->sb_qflags
|= (sbp
->sb_qflags
& XFS_PQUOTA_ACCT
) ?
324 XFS_PQUOTA_CHKD
: XFS_GQUOTA_CHKD
;
325 sbp
->sb_qflags
&= ~(XFS_OQUOTA_ENFD
| XFS_OQUOTA_CHKD
);
327 if (sbp
->sb_qflags
& XFS_PQUOTA_ACCT
) {
329 * In older version of superblock, on-disk superblock only
330 * has sb_gquotino, and in-core superblock has both sb_gquotino
331 * and sb_pquotino. But, only one of them is supported at any
332 * point of time. So, if PQUOTA is set in disk superblock,
333 * copy over sb_gquotino to sb_pquotino.
335 sbp
->sb_pquotino
= sbp
->sb_gquotino
;
336 sbp
->sb_gquotino
= NULLFSINO
;
346 to
->sb_magicnum
= be32_to_cpu(from
->sb_magicnum
);
347 to
->sb_blocksize
= be32_to_cpu(from
->sb_blocksize
);
348 to
->sb_dblocks
= be64_to_cpu(from
->sb_dblocks
);
349 to
->sb_rblocks
= be64_to_cpu(from
->sb_rblocks
);
350 to
->sb_rextents
= be64_to_cpu(from
->sb_rextents
);
351 memcpy(&to
->sb_uuid
, &from
->sb_uuid
, sizeof(to
->sb_uuid
));
352 to
->sb_logstart
= be64_to_cpu(from
->sb_logstart
);
353 to
->sb_rootino
= be64_to_cpu(from
->sb_rootino
);
354 to
->sb_rbmino
= be64_to_cpu(from
->sb_rbmino
);
355 to
->sb_rsumino
= be64_to_cpu(from
->sb_rsumino
);
356 to
->sb_rextsize
= be32_to_cpu(from
->sb_rextsize
);
357 to
->sb_agblocks
= be32_to_cpu(from
->sb_agblocks
);
358 to
->sb_agcount
= be32_to_cpu(from
->sb_agcount
);
359 to
->sb_rbmblocks
= be32_to_cpu(from
->sb_rbmblocks
);
360 to
->sb_logblocks
= be32_to_cpu(from
->sb_logblocks
);
361 to
->sb_versionnum
= be16_to_cpu(from
->sb_versionnum
);
362 to
->sb_sectsize
= be16_to_cpu(from
->sb_sectsize
);
363 to
->sb_inodesize
= be16_to_cpu(from
->sb_inodesize
);
364 to
->sb_inopblock
= be16_to_cpu(from
->sb_inopblock
);
365 memcpy(&to
->sb_fname
, &from
->sb_fname
, sizeof(to
->sb_fname
));
366 to
->sb_blocklog
= from
->sb_blocklog
;
367 to
->sb_sectlog
= from
->sb_sectlog
;
368 to
->sb_inodelog
= from
->sb_inodelog
;
369 to
->sb_inopblog
= from
->sb_inopblog
;
370 to
->sb_agblklog
= from
->sb_agblklog
;
371 to
->sb_rextslog
= from
->sb_rextslog
;
372 to
->sb_inprogress
= from
->sb_inprogress
;
373 to
->sb_imax_pct
= from
->sb_imax_pct
;
374 to
->sb_icount
= be64_to_cpu(from
->sb_icount
);
375 to
->sb_ifree
= be64_to_cpu(from
->sb_ifree
);
376 to
->sb_fdblocks
= be64_to_cpu(from
->sb_fdblocks
);
377 to
->sb_frextents
= be64_to_cpu(from
->sb_frextents
);
378 to
->sb_uquotino
= be64_to_cpu(from
->sb_uquotino
);
379 to
->sb_gquotino
= be64_to_cpu(from
->sb_gquotino
);
380 to
->sb_qflags
= be16_to_cpu(from
->sb_qflags
);
381 to
->sb_flags
= from
->sb_flags
;
382 to
->sb_shared_vn
= from
->sb_shared_vn
;
383 to
->sb_inoalignmt
= be32_to_cpu(from
->sb_inoalignmt
);
384 to
->sb_unit
= be32_to_cpu(from
->sb_unit
);
385 to
->sb_width
= be32_to_cpu(from
->sb_width
);
386 to
->sb_dirblklog
= from
->sb_dirblklog
;
387 to
->sb_logsectlog
= from
->sb_logsectlog
;
388 to
->sb_logsectsize
= be16_to_cpu(from
->sb_logsectsize
);
389 to
->sb_logsunit
= be32_to_cpu(from
->sb_logsunit
);
390 to
->sb_features2
= be32_to_cpu(from
->sb_features2
);
391 to
->sb_bad_features2
= be32_to_cpu(from
->sb_bad_features2
);
392 to
->sb_features_compat
= be32_to_cpu(from
->sb_features_compat
);
393 to
->sb_features_ro_compat
= be32_to_cpu(from
->sb_features_ro_compat
);
394 to
->sb_features_incompat
= be32_to_cpu(from
->sb_features_incompat
);
395 to
->sb_features_log_incompat
=
396 be32_to_cpu(from
->sb_features_log_incompat
);
397 /* crc is only used on disk, not in memory; just init to 0 here. */
399 to
->sb_spino_align
= be32_to_cpu(from
->sb_spino_align
);
400 to
->sb_pquotino
= be64_to_cpu(from
->sb_pquotino
);
401 to
->sb_lsn
= be64_to_cpu(from
->sb_lsn
);
403 * sb_meta_uuid is only on disk if it differs from sb_uuid and the
404 * feature flag is set; if not set we keep it only in memory.
406 if (xfs_sb_version_hasmetauuid(to
))
407 uuid_copy(&to
->sb_meta_uuid
, &from
->sb_meta_uuid
);
409 uuid_copy(&to
->sb_meta_uuid
, &from
->sb_uuid
);
410 /* Convert on-disk flags to in-memory flags? */
412 xfs_sb_quota_from_disk(to
);
420 __xfs_sb_from_disk(to
, from
, true);
424 xfs_sb_quota_to_disk(
428 __uint16_t qflags
= from
->sb_qflags
;
430 to
->sb_uquotino
= cpu_to_be64(from
->sb_uquotino
);
431 if (xfs_sb_version_has_pquotino(from
)) {
432 to
->sb_qflags
= cpu_to_be16(from
->sb_qflags
);
433 to
->sb_gquotino
= cpu_to_be64(from
->sb_gquotino
);
434 to
->sb_pquotino
= cpu_to_be64(from
->sb_pquotino
);
439 * The in-core version of sb_qflags do not have XFS_OQUOTA_*
440 * flags, whereas the on-disk version does. So, convert incore
441 * XFS_{PG}QUOTA_* flags to on-disk XFS_OQUOTA_* flags.
443 qflags
&= ~(XFS_PQUOTA_ENFD
| XFS_PQUOTA_CHKD
|
444 XFS_GQUOTA_ENFD
| XFS_GQUOTA_CHKD
);
446 if (from
->sb_qflags
&
447 (XFS_PQUOTA_ENFD
| XFS_GQUOTA_ENFD
))
448 qflags
|= XFS_OQUOTA_ENFD
;
449 if (from
->sb_qflags
&
450 (XFS_PQUOTA_CHKD
| XFS_GQUOTA_CHKD
))
451 qflags
|= XFS_OQUOTA_CHKD
;
452 to
->sb_qflags
= cpu_to_be16(qflags
);
455 * GQUOTINO and PQUOTINO cannot be used together in versions
456 * of superblock that do not have pquotino. from->sb_flags
457 * tells us which quota is active and should be copied to
458 * disk. If neither are active, we should NULL the inode.
460 * In all cases, the separate pquotino must remain 0 because it
461 * it beyond the "end" of the valid non-pquotino superblock.
463 if (from
->sb_qflags
& XFS_GQUOTA_ACCT
)
464 to
->sb_gquotino
= cpu_to_be64(from
->sb_gquotino
);
465 else if (from
->sb_qflags
& XFS_PQUOTA_ACCT
)
466 to
->sb_gquotino
= cpu_to_be64(from
->sb_pquotino
);
469 * We can't rely on just the fields being logged to tell us
470 * that it is safe to write NULLFSINO - we should only do that
471 * if quotas are not actually enabled. Hence only write
472 * NULLFSINO if both in-core quota inodes are NULL.
474 if (from
->sb_gquotino
== NULLFSINO
&&
475 from
->sb_pquotino
== NULLFSINO
)
476 to
->sb_gquotino
= cpu_to_be64(NULLFSINO
);
487 xfs_sb_quota_to_disk(to
, from
);
489 to
->sb_magicnum
= cpu_to_be32(from
->sb_magicnum
);
490 to
->sb_blocksize
= cpu_to_be32(from
->sb_blocksize
);
491 to
->sb_dblocks
= cpu_to_be64(from
->sb_dblocks
);
492 to
->sb_rblocks
= cpu_to_be64(from
->sb_rblocks
);
493 to
->sb_rextents
= cpu_to_be64(from
->sb_rextents
);
494 memcpy(&to
->sb_uuid
, &from
->sb_uuid
, sizeof(to
->sb_uuid
));
495 to
->sb_logstart
= cpu_to_be64(from
->sb_logstart
);
496 to
->sb_rootino
= cpu_to_be64(from
->sb_rootino
);
497 to
->sb_rbmino
= cpu_to_be64(from
->sb_rbmino
);
498 to
->sb_rsumino
= cpu_to_be64(from
->sb_rsumino
);
499 to
->sb_rextsize
= cpu_to_be32(from
->sb_rextsize
);
500 to
->sb_agblocks
= cpu_to_be32(from
->sb_agblocks
);
501 to
->sb_agcount
= cpu_to_be32(from
->sb_agcount
);
502 to
->sb_rbmblocks
= cpu_to_be32(from
->sb_rbmblocks
);
503 to
->sb_logblocks
= cpu_to_be32(from
->sb_logblocks
);
504 to
->sb_versionnum
= cpu_to_be16(from
->sb_versionnum
);
505 to
->sb_sectsize
= cpu_to_be16(from
->sb_sectsize
);
506 to
->sb_inodesize
= cpu_to_be16(from
->sb_inodesize
);
507 to
->sb_inopblock
= cpu_to_be16(from
->sb_inopblock
);
508 memcpy(&to
->sb_fname
, &from
->sb_fname
, sizeof(to
->sb_fname
));
509 to
->sb_blocklog
= from
->sb_blocklog
;
510 to
->sb_sectlog
= from
->sb_sectlog
;
511 to
->sb_inodelog
= from
->sb_inodelog
;
512 to
->sb_inopblog
= from
->sb_inopblog
;
513 to
->sb_agblklog
= from
->sb_agblklog
;
514 to
->sb_rextslog
= from
->sb_rextslog
;
515 to
->sb_inprogress
= from
->sb_inprogress
;
516 to
->sb_imax_pct
= from
->sb_imax_pct
;
517 to
->sb_icount
= cpu_to_be64(from
->sb_icount
);
518 to
->sb_ifree
= cpu_to_be64(from
->sb_ifree
);
519 to
->sb_fdblocks
= cpu_to_be64(from
->sb_fdblocks
);
520 to
->sb_frextents
= cpu_to_be64(from
->sb_frextents
);
522 to
->sb_flags
= from
->sb_flags
;
523 to
->sb_shared_vn
= from
->sb_shared_vn
;
524 to
->sb_inoalignmt
= cpu_to_be32(from
->sb_inoalignmt
);
525 to
->sb_unit
= cpu_to_be32(from
->sb_unit
);
526 to
->sb_width
= cpu_to_be32(from
->sb_width
);
527 to
->sb_dirblklog
= from
->sb_dirblklog
;
528 to
->sb_logsectlog
= from
->sb_logsectlog
;
529 to
->sb_logsectsize
= cpu_to_be16(from
->sb_logsectsize
);
530 to
->sb_logsunit
= cpu_to_be32(from
->sb_logsunit
);
533 * We need to ensure that bad_features2 always matches features2.
534 * Hence we enforce that here rather than having to remember to do it
535 * everywhere else that updates features2.
537 from
->sb_bad_features2
= from
->sb_features2
;
538 to
->sb_features2
= cpu_to_be32(from
->sb_features2
);
539 to
->sb_bad_features2
= cpu_to_be32(from
->sb_bad_features2
);
541 if (xfs_sb_version_hascrc(from
)) {
542 to
->sb_features_compat
= cpu_to_be32(from
->sb_features_compat
);
543 to
->sb_features_ro_compat
=
544 cpu_to_be32(from
->sb_features_ro_compat
);
545 to
->sb_features_incompat
=
546 cpu_to_be32(from
->sb_features_incompat
);
547 to
->sb_features_log_incompat
=
548 cpu_to_be32(from
->sb_features_log_incompat
);
549 to
->sb_spino_align
= cpu_to_be32(from
->sb_spino_align
);
550 to
->sb_lsn
= cpu_to_be64(from
->sb_lsn
);
551 if (xfs_sb_version_hasmetauuid(from
))
552 uuid_copy(&to
->sb_meta_uuid
, &from
->sb_meta_uuid
);
561 struct xfs_mount
*mp
= bp
->b_target
->bt_mount
;
565 * Use call variant which doesn't convert quota flags from disk
566 * format, because xfs_mount_validate_sb checks the on-disk flags.
568 __xfs_sb_from_disk(&sb
, XFS_BUF_TO_SBP(bp
), false);
571 * Only check the in progress field for the primary superblock as
572 * mkfs.xfs doesn't clear it from secondary superblocks.
574 return xfs_mount_validate_sb(mp
, &sb
, bp
->b_bn
== XFS_SB_DADDR
,
579 * If the superblock has the CRC feature bit set or the CRC field is non-null,
580 * check that the CRC is valid. We check the CRC field is non-null because a
581 * single bit error could clear the feature bit and unused parts of the
582 * superblock are supposed to be zero. Hence a non-null crc field indicates that
583 * we've potentially lost a feature bit and we should check it anyway.
585 * However, past bugs (i.e. in growfs) left non-zeroed regions beyond the
586 * last field in V4 secondary superblocks. So for secondary superblocks,
587 * we are more forgiving, and ignore CRC failures if the primary doesn't
588 * indicate that the fs version is V5.
594 struct xfs_mount
*mp
= bp
->b_target
->bt_mount
;
595 struct xfs_dsb
*dsb
= XFS_BUF_TO_SBP(bp
);
599 * open code the version check to avoid needing to convert the entire
600 * superblock from disk order just to check the version number
602 if (dsb
->sb_magicnum
== cpu_to_be32(XFS_SB_MAGIC
) &&
603 (((be16_to_cpu(dsb
->sb_versionnum
) & XFS_SB_VERSION_NUMBITS
) ==
607 if (!xfs_buf_verify_cksum(bp
, XFS_SB_CRC_OFF
)) {
608 /* Only fail bad secondaries on a known V5 filesystem */
609 if (bp
->b_bn
== XFS_SB_DADDR
||
610 xfs_sb_version_hascrc(&mp
->m_sb
)) {
616 error
= xfs_sb_verify(bp
, true);
620 xfs_buf_ioerror(bp
, error
);
621 if (error
== -EFSCORRUPTED
|| error
== -EFSBADCRC
)
622 xfs_verifier_error(bp
);
627 * We may be probed for a filesystem match, so we may not want to emit
628 * messages when the superblock buffer is not actually an XFS superblock.
629 * If we find an XFS superblock, then run a normal, noisy mount because we are
630 * really going to mount it and want to know about errors.
633 xfs_sb_quiet_read_verify(
636 struct xfs_dsb
*dsb
= XFS_BUF_TO_SBP(bp
);
638 if (dsb
->sb_magicnum
== cpu_to_be32(XFS_SB_MAGIC
)) {
639 /* XFS filesystem, verify noisily! */
640 xfs_sb_read_verify(bp
);
644 xfs_buf_ioerror(bp
, -EWRONGFS
);
651 struct xfs_mount
*mp
= bp
->b_target
->bt_mount
;
652 struct xfs_buf_log_item
*bip
= bp
->b_fspriv
;
655 error
= xfs_sb_verify(bp
, false);
657 xfs_buf_ioerror(bp
, error
);
658 xfs_verifier_error(bp
);
662 if (!xfs_sb_version_hascrc(&mp
->m_sb
))
666 XFS_BUF_TO_SBP(bp
)->sb_lsn
= cpu_to_be64(bip
->bli_item
.li_lsn
);
668 xfs_buf_update_cksum(bp
, XFS_SB_CRC_OFF
);
671 const struct xfs_buf_ops xfs_sb_buf_ops
= {
672 .verify_read
= xfs_sb_read_verify
,
673 .verify_write
= xfs_sb_write_verify
,
676 const struct xfs_buf_ops xfs_sb_quiet_buf_ops
= {
677 .verify_read
= xfs_sb_quiet_read_verify
,
678 .verify_write
= xfs_sb_write_verify
,
684 * Mount initialization code establishing various mount
685 * fields from the superblock associated with the given
690 struct xfs_mount
*mp
,
693 mp
->m_agfrotor
= mp
->m_agirotor
= 0;
694 spin_lock_init(&mp
->m_agirotor_lock
);
695 mp
->m_maxagi
= mp
->m_sb
.sb_agcount
;
696 mp
->m_blkbit_log
= sbp
->sb_blocklog
+ XFS_NBBYLOG
;
697 mp
->m_blkbb_log
= sbp
->sb_blocklog
- BBSHIFT
;
698 mp
->m_sectbb_log
= sbp
->sb_sectlog
- BBSHIFT
;
699 mp
->m_agno_log
= xfs_highbit32(sbp
->sb_agcount
- 1) + 1;
700 mp
->m_agino_log
= sbp
->sb_inopblog
+ sbp
->sb_agblklog
;
701 mp
->m_blockmask
= sbp
->sb_blocksize
- 1;
702 mp
->m_blockwsize
= sbp
->sb_blocksize
>> XFS_WORDLOG
;
703 mp
->m_blockwmask
= mp
->m_blockwsize
- 1;
705 mp
->m_alloc_mxr
[0] = xfs_allocbt_maxrecs(mp
, sbp
->sb_blocksize
, 1);
706 mp
->m_alloc_mxr
[1] = xfs_allocbt_maxrecs(mp
, sbp
->sb_blocksize
, 0);
707 mp
->m_alloc_mnr
[0] = mp
->m_alloc_mxr
[0] / 2;
708 mp
->m_alloc_mnr
[1] = mp
->m_alloc_mxr
[1] / 2;
710 mp
->m_inobt_mxr
[0] = xfs_inobt_maxrecs(mp
, sbp
->sb_blocksize
, 1);
711 mp
->m_inobt_mxr
[1] = xfs_inobt_maxrecs(mp
, sbp
->sb_blocksize
, 0);
712 mp
->m_inobt_mnr
[0] = mp
->m_inobt_mxr
[0] / 2;
713 mp
->m_inobt_mnr
[1] = mp
->m_inobt_mxr
[1] / 2;
715 mp
->m_bmap_dmxr
[0] = xfs_bmbt_maxrecs(mp
, sbp
->sb_blocksize
, 1);
716 mp
->m_bmap_dmxr
[1] = xfs_bmbt_maxrecs(mp
, sbp
->sb_blocksize
, 0);
717 mp
->m_bmap_dmnr
[0] = mp
->m_bmap_dmxr
[0] / 2;
718 mp
->m_bmap_dmnr
[1] = mp
->m_bmap_dmxr
[1] / 2;
720 mp
->m_bsize
= XFS_FSB_TO_BB(mp
, 1);
721 mp
->m_ialloc_inos
= (int)MAX((__uint16_t
)XFS_INODES_PER_CHUNK
,
723 mp
->m_ialloc_blks
= mp
->m_ialloc_inos
>> sbp
->sb_inopblog
;
725 if (sbp
->sb_spino_align
)
726 mp
->m_ialloc_min_blks
= sbp
->sb_spino_align
;
728 mp
->m_ialloc_min_blks
= mp
->m_ialloc_blks
;
732 * xfs_initialize_perag_data
734 * Read in each per-ag structure so we can count up the number of
735 * allocated inodes, free inodes and used filesystem blocks as this
736 * information is no longer persistent in the superblock. Once we have
737 * this information, write it into the in-core superblock structure.
740 xfs_initialize_perag_data(
741 struct xfs_mount
*mp
,
742 xfs_agnumber_t agcount
)
744 xfs_agnumber_t index
;
746 xfs_sb_t
*sbp
= &mp
->m_sb
;
750 uint64_t bfreelst
= 0;
754 for (index
= 0; index
< agcount
; index
++) {
756 * read the agf, then the agi. This gets us
757 * all the information we need and populates the
758 * per-ag structures for us.
760 error
= xfs_alloc_pagf_init(mp
, NULL
, index
, 0);
764 error
= xfs_ialloc_pagi_init(mp
, NULL
, index
);
767 pag
= xfs_perag_get(mp
, index
);
768 ifree
+= pag
->pagi_freecount
;
769 ialloc
+= pag
->pagi_count
;
770 bfree
+= pag
->pagf_freeblks
;
771 bfreelst
+= pag
->pagf_flcount
;
772 btree
+= pag
->pagf_btreeblks
;
776 /* Overwrite incore superblock counters with just-read data */
777 spin_lock(&mp
->m_sb_lock
);
778 sbp
->sb_ifree
= ifree
;
779 sbp
->sb_icount
= ialloc
;
780 sbp
->sb_fdblocks
= bfree
+ bfreelst
+ btree
;
781 spin_unlock(&mp
->m_sb_lock
);
783 xfs_reinit_percpu_counters(mp
);
789 * xfs_log_sb() can be used to copy arbitrary changes to the in-core superblock
790 * into the superblock buffer to be logged. It does not provide the higher
791 * level of locking that is needed to protect the in-core superblock from
796 struct xfs_trans
*tp
)
798 struct xfs_mount
*mp
= tp
->t_mountp
;
799 struct xfs_buf
*bp
= xfs_trans_getsb(tp
, mp
, 0);
801 mp
->m_sb
.sb_icount
= percpu_counter_sum(&mp
->m_icount
);
802 mp
->m_sb
.sb_ifree
= percpu_counter_sum(&mp
->m_ifree
);
803 mp
->m_sb
.sb_fdblocks
= percpu_counter_sum(&mp
->m_fdblocks
);
805 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp
), &mp
->m_sb
);
806 xfs_trans_buf_set_type(tp
, bp
, XFS_BLFT_SB_BUF
);
807 xfs_trans_log_buf(tp
, bp
, 0, sizeof(struct xfs_dsb
));
813 * Sync the superblock to disk.
815 * Note that the caller is responsible for checking the frozen state of the
816 * filesystem. This procedure uses the non-blocking transaction allocator and
817 * thus will allow modifications to a frozen fs. This is required because this
818 * code can be called during the process of freezing where use of the high-level
819 * allocator would deadlock.
823 struct xfs_mount
*mp
,
826 struct xfs_trans
*tp
;
829 tp
= _xfs_trans_alloc(mp
, XFS_TRANS_SB_CHANGE
, KM_SLEEP
);
830 error
= xfs_trans_reserve(tp
, &M_RES(mp
)->tr_sb
, 0, 0);
832 xfs_trans_cancel(tp
);
838 xfs_trans_set_sync(tp
);
839 return xfs_trans_commit(tp
);