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_trace.h"
31 #include "xfs_cksum.h"
32 #include "xfs_trans.h"
33 #include "xfs_bmap_btree.h"
34 #include "xfs_alloc_btree.h"
35 #include "xfs_ialloc_btree.h"
38 * Physical superblock buffer manipulations. Shared with libxfs in userspace.
42 * Reference counting access wrappers to the perag structures.
43 * Because we never free per-ag structures, the only thing we
44 * have to protect against changes is the tree structure itself.
51 struct xfs_perag
*pag
;
55 pag
= radix_tree_lookup(&mp
->m_perag_tree
, agno
);
57 ASSERT(atomic_read(&pag
->pag_ref
) >= 0);
58 ref
= atomic_inc_return(&pag
->pag_ref
);
61 trace_xfs_perag_get(mp
, agno
, ref
, _RET_IP_
);
66 * search from @first to find the next perag with the given tag set.
74 struct xfs_perag
*pag
;
79 found
= radix_tree_gang_lookup_tag(&mp
->m_perag_tree
,
80 (void **)&pag
, first
, 1, tag
);
85 ref
= atomic_inc_return(&pag
->pag_ref
);
87 trace_xfs_perag_get_tag(mp
, pag
->pag_agno
, ref
, _RET_IP_
);
93 struct xfs_perag
*pag
)
97 ASSERT(atomic_read(&pag
->pag_ref
) > 0);
98 ref
= atomic_dec_return(&pag
->pag_ref
);
99 trace_xfs_perag_put(pag
->pag_mount
, pag
->pag_agno
, ref
, _RET_IP_
);
103 * Check the validity of the SB found.
106 xfs_mount_validate_sb(
109 bool check_inprogress
,
112 if (sbp
->sb_magicnum
!= XFS_SB_MAGIC
) {
113 xfs_warn(mp
, "bad magic number");
118 if (!xfs_sb_good_version(sbp
)) {
119 xfs_warn(mp
, "bad version");
124 * Version 5 superblock feature mask validation. Reject combinations the
125 * kernel cannot support up front before checking anything else. For
126 * write validation, we don't need to check feature masks.
128 if (check_version
&& XFS_SB_VERSION_NUM(sbp
) == XFS_SB_VERSION_5
) {
129 if (xfs_sb_has_compat_feature(sbp
,
130 XFS_SB_FEAT_COMPAT_UNKNOWN
)) {
132 "Superblock has unknown compatible features (0x%x) enabled.\n"
133 "Using a more recent kernel is recommended.",
134 (sbp
->sb_features_compat
&
135 XFS_SB_FEAT_COMPAT_UNKNOWN
));
138 if (xfs_sb_has_ro_compat_feature(sbp
,
139 XFS_SB_FEAT_RO_COMPAT_UNKNOWN
)) {
141 "Superblock has unknown read-only compatible features (0x%x) enabled.",
142 (sbp
->sb_features_ro_compat
&
143 XFS_SB_FEAT_RO_COMPAT_UNKNOWN
));
144 if (!(mp
->m_flags
& XFS_MOUNT_RDONLY
)) {
146 "Attempted to mount read-only compatible filesystem read-write.\n"
147 "Filesystem can only be safely mounted read only.");
151 if (xfs_sb_has_incompat_feature(sbp
,
152 XFS_SB_FEAT_INCOMPAT_UNKNOWN
)) {
154 "Superblock has unknown incompatible features (0x%x) enabled.\n"
155 "Filesystem can not be safely mounted by this kernel.",
156 (sbp
->sb_features_incompat
&
157 XFS_SB_FEAT_INCOMPAT_UNKNOWN
));
162 if (xfs_sb_version_has_pquotino(sbp
)) {
163 if (sbp
->sb_qflags
& (XFS_OQUOTA_ENFD
| XFS_OQUOTA_CHKD
)) {
165 "Version 5 of Super block has XFS_OQUOTA bits.");
166 return -EFSCORRUPTED
;
168 } else if (sbp
->sb_qflags
& (XFS_PQUOTA_ENFD
| XFS_GQUOTA_ENFD
|
169 XFS_PQUOTA_CHKD
| XFS_GQUOTA_CHKD
)) {
171 "Superblock earlier than Version 5 has XFS_[PQ]UOTA_{ENFD|CHKD} bits.");
172 return -EFSCORRUPTED
;
176 sbp
->sb_logstart
== 0 && mp
->m_logdev_targp
== mp
->m_ddev_targp
)) {
178 "filesystem is marked as having an external log; "
179 "specify logdev on the mount command line.");
184 sbp
->sb_logstart
!= 0 && mp
->m_logdev_targp
!= mp
->m_ddev_targp
)) {
186 "filesystem is marked as having an internal log; "
187 "do not specify logdev on the mount command line.");
192 * More sanity checking. Most of these were stolen directly from
196 sbp
->sb_agcount
<= 0 ||
197 sbp
->sb_sectsize
< XFS_MIN_SECTORSIZE
||
198 sbp
->sb_sectsize
> XFS_MAX_SECTORSIZE
||
199 sbp
->sb_sectlog
< XFS_MIN_SECTORSIZE_LOG
||
200 sbp
->sb_sectlog
> XFS_MAX_SECTORSIZE_LOG
||
201 sbp
->sb_sectsize
!= (1 << sbp
->sb_sectlog
) ||
202 sbp
->sb_blocksize
< XFS_MIN_BLOCKSIZE
||
203 sbp
->sb_blocksize
> XFS_MAX_BLOCKSIZE
||
204 sbp
->sb_blocklog
< XFS_MIN_BLOCKSIZE_LOG
||
205 sbp
->sb_blocklog
> XFS_MAX_BLOCKSIZE_LOG
||
206 sbp
->sb_blocksize
!= (1 << sbp
->sb_blocklog
) ||
207 sbp
->sb_dirblklog
> XFS_MAX_BLOCKSIZE_LOG
||
208 sbp
->sb_inodesize
< XFS_DINODE_MIN_SIZE
||
209 sbp
->sb_inodesize
> XFS_DINODE_MAX_SIZE
||
210 sbp
->sb_inodelog
< XFS_DINODE_MIN_LOG
||
211 sbp
->sb_inodelog
> XFS_DINODE_MAX_LOG
||
212 sbp
->sb_inodesize
!= (1 << sbp
->sb_inodelog
) ||
213 sbp
->sb_logsunit
> XLOG_MAX_RECORD_BSIZE
||
214 sbp
->sb_inopblock
!= howmany(sbp
->sb_blocksize
,sbp
->sb_inodesize
) ||
215 (sbp
->sb_blocklog
- sbp
->sb_inodelog
!= sbp
->sb_inopblog
) ||
216 (sbp
->sb_rextsize
* sbp
->sb_blocksize
> XFS_MAX_RTEXTSIZE
) ||
217 (sbp
->sb_rextsize
* sbp
->sb_blocksize
< XFS_MIN_RTEXTSIZE
) ||
218 (sbp
->sb_imax_pct
> 100 /* zero sb_imax_pct is valid */) ||
219 sbp
->sb_dblocks
== 0 ||
220 sbp
->sb_dblocks
> XFS_MAX_DBLOCKS(sbp
) ||
221 sbp
->sb_dblocks
< XFS_MIN_DBLOCKS(sbp
) ||
222 sbp
->sb_shared_vn
!= 0)) {
223 xfs_notice(mp
, "SB sanity check failed");
224 return -EFSCORRUPTED
;
228 * Currently only very few inode sizes are supported.
230 switch (sbp
->sb_inodesize
) {
237 xfs_warn(mp
, "inode size of %d bytes not supported",
242 if (xfs_sb_validate_fsb_count(sbp
, sbp
->sb_dblocks
) ||
243 xfs_sb_validate_fsb_count(sbp
, sbp
->sb_rblocks
)) {
245 "file system too large to be mounted on this system.");
253 xfs_sb_quota_from_disk(struct xfs_sb
*sbp
)
256 * older mkfs doesn't initialize quota inodes to NULLFSINO. This
257 * leads to in-core values having two different values for a quota
258 * inode to be invalid: 0 and NULLFSINO. Change it to a single value
261 * Note that this change affect only the in-core values. These
262 * values are not written back to disk unless any quota information
263 * is written to the disk. Even in that case, sb_pquotino field is
264 * not written to disk unless the superblock supports pquotino.
266 if (sbp
->sb_uquotino
== 0)
267 sbp
->sb_uquotino
= NULLFSINO
;
268 if (sbp
->sb_gquotino
== 0)
269 sbp
->sb_gquotino
= NULLFSINO
;
270 if (sbp
->sb_pquotino
== 0)
271 sbp
->sb_pquotino
= NULLFSINO
;
274 * We need to do these manipilations only if we are working
275 * with an older version of on-disk superblock.
277 if (xfs_sb_version_has_pquotino(sbp
))
280 if (sbp
->sb_qflags
& XFS_OQUOTA_ENFD
)
281 sbp
->sb_qflags
|= (sbp
->sb_qflags
& XFS_PQUOTA_ACCT
) ?
282 XFS_PQUOTA_ENFD
: XFS_GQUOTA_ENFD
;
283 if (sbp
->sb_qflags
& XFS_OQUOTA_CHKD
)
284 sbp
->sb_qflags
|= (sbp
->sb_qflags
& XFS_PQUOTA_ACCT
) ?
285 XFS_PQUOTA_CHKD
: XFS_GQUOTA_CHKD
;
286 sbp
->sb_qflags
&= ~(XFS_OQUOTA_ENFD
| XFS_OQUOTA_CHKD
);
288 if (sbp
->sb_qflags
& XFS_PQUOTA_ACCT
) {
290 * In older version of superblock, on-disk superblock only
291 * has sb_gquotino, and in-core superblock has both sb_gquotino
292 * and sb_pquotino. But, only one of them is supported at any
293 * point of time. So, if PQUOTA is set in disk superblock,
294 * copy over sb_gquotino to sb_pquotino.
296 sbp
->sb_pquotino
= sbp
->sb_gquotino
;
297 sbp
->sb_gquotino
= NULLFSINO
;
307 to
->sb_magicnum
= be32_to_cpu(from
->sb_magicnum
);
308 to
->sb_blocksize
= be32_to_cpu(from
->sb_blocksize
);
309 to
->sb_dblocks
= be64_to_cpu(from
->sb_dblocks
);
310 to
->sb_rblocks
= be64_to_cpu(from
->sb_rblocks
);
311 to
->sb_rextents
= be64_to_cpu(from
->sb_rextents
);
312 memcpy(&to
->sb_uuid
, &from
->sb_uuid
, sizeof(to
->sb_uuid
));
313 to
->sb_logstart
= be64_to_cpu(from
->sb_logstart
);
314 to
->sb_rootino
= be64_to_cpu(from
->sb_rootino
);
315 to
->sb_rbmino
= be64_to_cpu(from
->sb_rbmino
);
316 to
->sb_rsumino
= be64_to_cpu(from
->sb_rsumino
);
317 to
->sb_rextsize
= be32_to_cpu(from
->sb_rextsize
);
318 to
->sb_agblocks
= be32_to_cpu(from
->sb_agblocks
);
319 to
->sb_agcount
= be32_to_cpu(from
->sb_agcount
);
320 to
->sb_rbmblocks
= be32_to_cpu(from
->sb_rbmblocks
);
321 to
->sb_logblocks
= be32_to_cpu(from
->sb_logblocks
);
322 to
->sb_versionnum
= be16_to_cpu(from
->sb_versionnum
);
323 to
->sb_sectsize
= be16_to_cpu(from
->sb_sectsize
);
324 to
->sb_inodesize
= be16_to_cpu(from
->sb_inodesize
);
325 to
->sb_inopblock
= be16_to_cpu(from
->sb_inopblock
);
326 memcpy(&to
->sb_fname
, &from
->sb_fname
, sizeof(to
->sb_fname
));
327 to
->sb_blocklog
= from
->sb_blocklog
;
328 to
->sb_sectlog
= from
->sb_sectlog
;
329 to
->sb_inodelog
= from
->sb_inodelog
;
330 to
->sb_inopblog
= from
->sb_inopblog
;
331 to
->sb_agblklog
= from
->sb_agblklog
;
332 to
->sb_rextslog
= from
->sb_rextslog
;
333 to
->sb_inprogress
= from
->sb_inprogress
;
334 to
->sb_imax_pct
= from
->sb_imax_pct
;
335 to
->sb_icount
= be64_to_cpu(from
->sb_icount
);
336 to
->sb_ifree
= be64_to_cpu(from
->sb_ifree
);
337 to
->sb_fdblocks
= be64_to_cpu(from
->sb_fdblocks
);
338 to
->sb_frextents
= be64_to_cpu(from
->sb_frextents
);
339 to
->sb_uquotino
= be64_to_cpu(from
->sb_uquotino
);
340 to
->sb_gquotino
= be64_to_cpu(from
->sb_gquotino
);
341 to
->sb_qflags
= be16_to_cpu(from
->sb_qflags
);
342 to
->sb_flags
= from
->sb_flags
;
343 to
->sb_shared_vn
= from
->sb_shared_vn
;
344 to
->sb_inoalignmt
= be32_to_cpu(from
->sb_inoalignmt
);
345 to
->sb_unit
= be32_to_cpu(from
->sb_unit
);
346 to
->sb_width
= be32_to_cpu(from
->sb_width
);
347 to
->sb_dirblklog
= from
->sb_dirblklog
;
348 to
->sb_logsectlog
= from
->sb_logsectlog
;
349 to
->sb_logsectsize
= be16_to_cpu(from
->sb_logsectsize
);
350 to
->sb_logsunit
= be32_to_cpu(from
->sb_logsunit
);
351 to
->sb_features2
= be32_to_cpu(from
->sb_features2
);
352 to
->sb_bad_features2
= be32_to_cpu(from
->sb_bad_features2
);
353 to
->sb_features_compat
= be32_to_cpu(from
->sb_features_compat
);
354 to
->sb_features_ro_compat
= be32_to_cpu(from
->sb_features_ro_compat
);
355 to
->sb_features_incompat
= be32_to_cpu(from
->sb_features_incompat
);
356 to
->sb_features_log_incompat
=
357 be32_to_cpu(from
->sb_features_log_incompat
);
358 /* crc is only used on disk, not in memory; just init to 0 here. */
361 to
->sb_pquotino
= be64_to_cpu(from
->sb_pquotino
);
362 to
->sb_lsn
= be64_to_cpu(from
->sb_lsn
);
363 /* Convert on-disk flags to in-memory flags? */
365 xfs_sb_quota_from_disk(to
);
373 __xfs_sb_from_disk(to
, from
, true);
377 xfs_sb_quota_to_disk(
381 __uint16_t qflags
= from
->sb_qflags
;
383 to
->sb_uquotino
= cpu_to_be64(from
->sb_uquotino
);
384 if (xfs_sb_version_has_pquotino(from
)) {
385 to
->sb_qflags
= cpu_to_be16(from
->sb_qflags
);
386 to
->sb_gquotino
= cpu_to_be64(from
->sb_gquotino
);
387 to
->sb_pquotino
= cpu_to_be64(from
->sb_pquotino
);
392 * The in-core version of sb_qflags do not have XFS_OQUOTA_*
393 * flags, whereas the on-disk version does. So, convert incore
394 * XFS_{PG}QUOTA_* flags to on-disk XFS_OQUOTA_* flags.
396 qflags
&= ~(XFS_PQUOTA_ENFD
| XFS_PQUOTA_CHKD
|
397 XFS_GQUOTA_ENFD
| XFS_GQUOTA_CHKD
);
399 if (from
->sb_qflags
&
400 (XFS_PQUOTA_ENFD
| XFS_GQUOTA_ENFD
))
401 qflags
|= XFS_OQUOTA_ENFD
;
402 if (from
->sb_qflags
&
403 (XFS_PQUOTA_CHKD
| XFS_GQUOTA_CHKD
))
404 qflags
|= XFS_OQUOTA_CHKD
;
405 to
->sb_qflags
= cpu_to_be16(qflags
);
408 * GQUOTINO and PQUOTINO cannot be used together in versions
409 * of superblock that do not have pquotino. from->sb_flags
410 * tells us which quota is active and should be copied to
411 * disk. If neither are active, we should NULL the inode.
413 * In all cases, the separate pquotino must remain 0 because it
414 * it beyond the "end" of the valid non-pquotino superblock.
416 if (from
->sb_qflags
& XFS_GQUOTA_ACCT
)
417 to
->sb_gquotino
= cpu_to_be64(from
->sb_gquotino
);
418 else if (from
->sb_qflags
& XFS_PQUOTA_ACCT
)
419 to
->sb_gquotino
= cpu_to_be64(from
->sb_pquotino
);
422 * We can't rely on just the fields being logged to tell us
423 * that it is safe to write NULLFSINO - we should only do that
424 * if quotas are not actually enabled. Hence only write
425 * NULLFSINO if both in-core quota inodes are NULL.
427 if (from
->sb_gquotino
== NULLFSINO
&&
428 from
->sb_pquotino
== NULLFSINO
)
429 to
->sb_gquotino
= cpu_to_be64(NULLFSINO
);
440 xfs_sb_quota_to_disk(to
, from
);
442 to
->sb_magicnum
= cpu_to_be32(from
->sb_magicnum
);
443 to
->sb_blocksize
= cpu_to_be32(from
->sb_blocksize
);
444 to
->sb_dblocks
= cpu_to_be64(from
->sb_dblocks
);
445 to
->sb_rblocks
= cpu_to_be64(from
->sb_rblocks
);
446 to
->sb_rextents
= cpu_to_be64(from
->sb_rextents
);
447 memcpy(&to
->sb_uuid
, &from
->sb_uuid
, sizeof(to
->sb_uuid
));
448 to
->sb_logstart
= cpu_to_be64(from
->sb_logstart
);
449 to
->sb_rootino
= cpu_to_be64(from
->sb_rootino
);
450 to
->sb_rbmino
= cpu_to_be64(from
->sb_rbmino
);
451 to
->sb_rsumino
= cpu_to_be64(from
->sb_rsumino
);
452 to
->sb_rextsize
= cpu_to_be32(from
->sb_rextsize
);
453 to
->sb_agblocks
= cpu_to_be32(from
->sb_agblocks
);
454 to
->sb_agcount
= cpu_to_be32(from
->sb_agcount
);
455 to
->sb_rbmblocks
= cpu_to_be32(from
->sb_rbmblocks
);
456 to
->sb_logblocks
= cpu_to_be32(from
->sb_logblocks
);
457 to
->sb_versionnum
= cpu_to_be16(from
->sb_versionnum
);
458 to
->sb_sectsize
= cpu_to_be16(from
->sb_sectsize
);
459 to
->sb_inodesize
= cpu_to_be16(from
->sb_inodesize
);
460 to
->sb_inopblock
= cpu_to_be16(from
->sb_inopblock
);
461 memcpy(&to
->sb_fname
, &from
->sb_fname
, sizeof(to
->sb_fname
));
462 to
->sb_blocklog
= from
->sb_blocklog
;
463 to
->sb_sectlog
= from
->sb_sectlog
;
464 to
->sb_inodelog
= from
->sb_inodelog
;
465 to
->sb_inopblog
= from
->sb_inopblog
;
466 to
->sb_agblklog
= from
->sb_agblklog
;
467 to
->sb_rextslog
= from
->sb_rextslog
;
468 to
->sb_inprogress
= from
->sb_inprogress
;
469 to
->sb_imax_pct
= from
->sb_imax_pct
;
470 to
->sb_icount
= cpu_to_be64(from
->sb_icount
);
471 to
->sb_ifree
= cpu_to_be64(from
->sb_ifree
);
472 to
->sb_fdblocks
= cpu_to_be64(from
->sb_fdblocks
);
473 to
->sb_frextents
= cpu_to_be64(from
->sb_frextents
);
475 to
->sb_flags
= from
->sb_flags
;
476 to
->sb_shared_vn
= from
->sb_shared_vn
;
477 to
->sb_inoalignmt
= cpu_to_be32(from
->sb_inoalignmt
);
478 to
->sb_unit
= cpu_to_be32(from
->sb_unit
);
479 to
->sb_width
= cpu_to_be32(from
->sb_width
);
480 to
->sb_dirblklog
= from
->sb_dirblklog
;
481 to
->sb_logsectlog
= from
->sb_logsectlog
;
482 to
->sb_logsectsize
= cpu_to_be16(from
->sb_logsectsize
);
483 to
->sb_logsunit
= cpu_to_be32(from
->sb_logsunit
);
486 * We need to ensure that bad_features2 always matches features2.
487 * Hence we enforce that here rather than having to remember to do it
488 * everywhere else that updates features2.
490 from
->sb_bad_features2
= from
->sb_features2
;
491 to
->sb_features2
= cpu_to_be32(from
->sb_features2
);
492 to
->sb_bad_features2
= cpu_to_be32(from
->sb_bad_features2
);
494 if (xfs_sb_version_hascrc(from
)) {
495 to
->sb_features_compat
= cpu_to_be32(from
->sb_features_compat
);
496 to
->sb_features_ro_compat
=
497 cpu_to_be32(from
->sb_features_ro_compat
);
498 to
->sb_features_incompat
=
499 cpu_to_be32(from
->sb_features_incompat
);
500 to
->sb_features_log_incompat
=
501 cpu_to_be32(from
->sb_features_log_incompat
);
503 to
->sb_lsn
= cpu_to_be64(from
->sb_lsn
);
512 struct xfs_mount
*mp
= bp
->b_target
->bt_mount
;
516 * Use call variant which doesn't convert quota flags from disk
517 * format, because xfs_mount_validate_sb checks the on-disk flags.
519 __xfs_sb_from_disk(&sb
, XFS_BUF_TO_SBP(bp
), false);
522 * Only check the in progress field for the primary superblock as
523 * mkfs.xfs doesn't clear it from secondary superblocks.
525 return xfs_mount_validate_sb(mp
, &sb
, bp
->b_bn
== XFS_SB_DADDR
,
530 * If the superblock has the CRC feature bit set or the CRC field is non-null,
531 * check that the CRC is valid. We check the CRC field is non-null because a
532 * single bit error could clear the feature bit and unused parts of the
533 * superblock are supposed to be zero. Hence a non-null crc field indicates that
534 * we've potentially lost a feature bit and we should check it anyway.
536 * However, past bugs (i.e. in growfs) left non-zeroed regions beyond the
537 * last field in V4 secondary superblocks. So for secondary superblocks,
538 * we are more forgiving, and ignore CRC failures if the primary doesn't
539 * indicate that the fs version is V5.
545 struct xfs_mount
*mp
= bp
->b_target
->bt_mount
;
546 struct xfs_dsb
*dsb
= XFS_BUF_TO_SBP(bp
);
550 * open code the version check to avoid needing to convert the entire
551 * superblock from disk order just to check the version number
553 if (dsb
->sb_magicnum
== cpu_to_be32(XFS_SB_MAGIC
) &&
554 (((be16_to_cpu(dsb
->sb_versionnum
) & XFS_SB_VERSION_NUMBITS
) ==
558 if (!xfs_buf_verify_cksum(bp
, XFS_SB_CRC_OFF
)) {
559 /* Only fail bad secondaries on a known V5 filesystem */
560 if (bp
->b_bn
== XFS_SB_DADDR
||
561 xfs_sb_version_hascrc(&mp
->m_sb
)) {
567 error
= xfs_sb_verify(bp
, true);
571 xfs_buf_ioerror(bp
, error
);
572 if (error
== -EFSCORRUPTED
|| error
== -EFSBADCRC
)
573 xfs_verifier_error(bp
);
578 * We may be probed for a filesystem match, so we may not want to emit
579 * messages when the superblock buffer is not actually an XFS superblock.
580 * If we find an XFS superblock, then run a normal, noisy mount because we are
581 * really going to mount it and want to know about errors.
584 xfs_sb_quiet_read_verify(
587 struct xfs_dsb
*dsb
= XFS_BUF_TO_SBP(bp
);
589 if (dsb
->sb_magicnum
== cpu_to_be32(XFS_SB_MAGIC
)) {
590 /* XFS filesystem, verify noisily! */
591 xfs_sb_read_verify(bp
);
595 xfs_buf_ioerror(bp
, -EWRONGFS
);
602 struct xfs_mount
*mp
= bp
->b_target
->bt_mount
;
603 struct xfs_buf_log_item
*bip
= bp
->b_fspriv
;
606 error
= xfs_sb_verify(bp
, false);
608 xfs_buf_ioerror(bp
, error
);
609 xfs_verifier_error(bp
);
613 if (!xfs_sb_version_hascrc(&mp
->m_sb
))
617 XFS_BUF_TO_SBP(bp
)->sb_lsn
= cpu_to_be64(bip
->bli_item
.li_lsn
);
619 xfs_buf_update_cksum(bp
, XFS_SB_CRC_OFF
);
622 const struct xfs_buf_ops xfs_sb_buf_ops
= {
623 .verify_read
= xfs_sb_read_verify
,
624 .verify_write
= xfs_sb_write_verify
,
627 const struct xfs_buf_ops xfs_sb_quiet_buf_ops
= {
628 .verify_read
= xfs_sb_quiet_read_verify
,
629 .verify_write
= xfs_sb_write_verify
,
635 * Mount initialization code establishing various mount
636 * fields from the superblock associated with the given
641 struct xfs_mount
*mp
,
644 mp
->m_agfrotor
= mp
->m_agirotor
= 0;
645 spin_lock_init(&mp
->m_agirotor_lock
);
646 mp
->m_maxagi
= mp
->m_sb
.sb_agcount
;
647 mp
->m_blkbit_log
= sbp
->sb_blocklog
+ XFS_NBBYLOG
;
648 mp
->m_blkbb_log
= sbp
->sb_blocklog
- BBSHIFT
;
649 mp
->m_sectbb_log
= sbp
->sb_sectlog
- BBSHIFT
;
650 mp
->m_agno_log
= xfs_highbit32(sbp
->sb_agcount
- 1) + 1;
651 mp
->m_agino_log
= sbp
->sb_inopblog
+ sbp
->sb_agblklog
;
652 mp
->m_blockmask
= sbp
->sb_blocksize
- 1;
653 mp
->m_blockwsize
= sbp
->sb_blocksize
>> XFS_WORDLOG
;
654 mp
->m_blockwmask
= mp
->m_blockwsize
- 1;
656 mp
->m_alloc_mxr
[0] = xfs_allocbt_maxrecs(mp
, sbp
->sb_blocksize
, 1);
657 mp
->m_alloc_mxr
[1] = xfs_allocbt_maxrecs(mp
, sbp
->sb_blocksize
, 0);
658 mp
->m_alloc_mnr
[0] = mp
->m_alloc_mxr
[0] / 2;
659 mp
->m_alloc_mnr
[1] = mp
->m_alloc_mxr
[1] / 2;
661 mp
->m_inobt_mxr
[0] = xfs_inobt_maxrecs(mp
, sbp
->sb_blocksize
, 1);
662 mp
->m_inobt_mxr
[1] = xfs_inobt_maxrecs(mp
, sbp
->sb_blocksize
, 0);
663 mp
->m_inobt_mnr
[0] = mp
->m_inobt_mxr
[0] / 2;
664 mp
->m_inobt_mnr
[1] = mp
->m_inobt_mxr
[1] / 2;
666 mp
->m_bmap_dmxr
[0] = xfs_bmbt_maxrecs(mp
, sbp
->sb_blocksize
, 1);
667 mp
->m_bmap_dmxr
[1] = xfs_bmbt_maxrecs(mp
, sbp
->sb_blocksize
, 0);
668 mp
->m_bmap_dmnr
[0] = mp
->m_bmap_dmxr
[0] / 2;
669 mp
->m_bmap_dmnr
[1] = mp
->m_bmap_dmxr
[1] / 2;
671 mp
->m_bsize
= XFS_FSB_TO_BB(mp
, 1);
672 mp
->m_ialloc_inos
= (int)MAX((__uint16_t
)XFS_INODES_PER_CHUNK
,
674 mp
->m_ialloc_blks
= mp
->m_ialloc_inos
>> sbp
->sb_inopblog
;
678 * xfs_initialize_perag_data
680 * Read in each per-ag structure so we can count up the number of
681 * allocated inodes, free inodes and used filesystem blocks as this
682 * information is no longer persistent in the superblock. Once we have
683 * this information, write it into the in-core superblock structure.
686 xfs_initialize_perag_data(
687 struct xfs_mount
*mp
,
688 xfs_agnumber_t agcount
)
690 xfs_agnumber_t index
;
692 xfs_sb_t
*sbp
= &mp
->m_sb
;
696 uint64_t bfreelst
= 0;
700 for (index
= 0; index
< agcount
; index
++) {
702 * read the agf, then the agi. This gets us
703 * all the information we need and populates the
704 * per-ag structures for us.
706 error
= xfs_alloc_pagf_init(mp
, NULL
, index
, 0);
710 error
= xfs_ialloc_pagi_init(mp
, NULL
, index
);
713 pag
= xfs_perag_get(mp
, index
);
714 ifree
+= pag
->pagi_freecount
;
715 ialloc
+= pag
->pagi_count
;
716 bfree
+= pag
->pagf_freeblks
;
717 bfreelst
+= pag
->pagf_flcount
;
718 btree
+= pag
->pagf_btreeblks
;
722 /* Overwrite incore superblock counters with just-read data */
723 spin_lock(&mp
->m_sb_lock
);
724 sbp
->sb_ifree
= ifree
;
725 sbp
->sb_icount
= ialloc
;
726 sbp
->sb_fdblocks
= bfree
+ bfreelst
+ btree
;
727 spin_unlock(&mp
->m_sb_lock
);
729 xfs_reinit_percpu_counters(mp
);
735 * xfs_log_sb() can be used to copy arbitrary changes to the in-core superblock
736 * into the superblock buffer to be logged. It does not provide the higher
737 * level of locking that is needed to protect the in-core superblock from
742 struct xfs_trans
*tp
)
744 struct xfs_mount
*mp
= tp
->t_mountp
;
745 struct xfs_buf
*bp
= xfs_trans_getsb(tp
, mp
, 0);
747 mp
->m_sb
.sb_icount
= percpu_counter_sum(&mp
->m_icount
);
748 mp
->m_sb
.sb_ifree
= percpu_counter_sum(&mp
->m_ifree
);
749 mp
->m_sb
.sb_fdblocks
= percpu_counter_sum(&mp
->m_fdblocks
);
751 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp
), &mp
->m_sb
);
752 xfs_trans_buf_set_type(tp
, bp
, XFS_BLFT_SB_BUF
);
753 xfs_trans_log_buf(tp
, bp
, 0, sizeof(struct xfs_dsb
));
759 * Sync the superblock to disk.
761 * Note that the caller is responsible for checking the frozen state of the
762 * filesystem. This procedure uses the non-blocking transaction allocator and
763 * thus will allow modifications to a frozen fs. This is required because this
764 * code can be called during the process of freezing where use of the high-level
765 * allocator would deadlock.
769 struct xfs_mount
*mp
,
772 struct xfs_trans
*tp
;
775 tp
= _xfs_trans_alloc(mp
, XFS_TRANS_SB_CHANGE
, KM_SLEEP
);
776 error
= xfs_trans_reserve(tp
, &M_RES(mp
)->tr_sb
, 0, 0);
778 xfs_trans_cancel(tp
, 0);
784 xfs_trans_set_sync(tp
);
785 return xfs_trans_commit(tp
, 0);