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
21 * Physical superblock buffer manipulations. Shared with libxfs in userspace.
26 short type
; /* 0 = integer
27 * 1 = binary / string (no translation)
30 { offsetof(xfs_sb_t
, sb_magicnum
), 0 },
31 { offsetof(xfs_sb_t
, sb_blocksize
), 0 },
32 { offsetof(xfs_sb_t
, sb_dblocks
), 0 },
33 { offsetof(xfs_sb_t
, sb_rblocks
), 0 },
34 { offsetof(xfs_sb_t
, sb_rextents
), 0 },
35 { offsetof(xfs_sb_t
, sb_uuid
), 1 },
36 { offsetof(xfs_sb_t
, sb_logstart
), 0 },
37 { offsetof(xfs_sb_t
, sb_rootino
), 0 },
38 { offsetof(xfs_sb_t
, sb_rbmino
), 0 },
39 { offsetof(xfs_sb_t
, sb_rsumino
), 0 },
40 { offsetof(xfs_sb_t
, sb_rextsize
), 0 },
41 { offsetof(xfs_sb_t
, sb_agblocks
), 0 },
42 { offsetof(xfs_sb_t
, sb_agcount
), 0 },
43 { offsetof(xfs_sb_t
, sb_rbmblocks
), 0 },
44 { offsetof(xfs_sb_t
, sb_logblocks
), 0 },
45 { offsetof(xfs_sb_t
, sb_versionnum
), 0 },
46 { offsetof(xfs_sb_t
, sb_sectsize
), 0 },
47 { offsetof(xfs_sb_t
, sb_inodesize
), 0 },
48 { offsetof(xfs_sb_t
, sb_inopblock
), 0 },
49 { offsetof(xfs_sb_t
, sb_fname
[0]), 1 },
50 { offsetof(xfs_sb_t
, sb_blocklog
), 0 },
51 { offsetof(xfs_sb_t
, sb_sectlog
), 0 },
52 { offsetof(xfs_sb_t
, sb_inodelog
), 0 },
53 { offsetof(xfs_sb_t
, sb_inopblog
), 0 },
54 { offsetof(xfs_sb_t
, sb_agblklog
), 0 },
55 { offsetof(xfs_sb_t
, sb_rextslog
), 0 },
56 { offsetof(xfs_sb_t
, sb_inprogress
), 0 },
57 { offsetof(xfs_sb_t
, sb_imax_pct
), 0 },
58 { offsetof(xfs_sb_t
, sb_icount
), 0 },
59 { offsetof(xfs_sb_t
, sb_ifree
), 0 },
60 { offsetof(xfs_sb_t
, sb_fdblocks
), 0 },
61 { offsetof(xfs_sb_t
, sb_frextents
), 0 },
62 { offsetof(xfs_sb_t
, sb_uquotino
), 0 },
63 { offsetof(xfs_sb_t
, sb_gquotino
), 0 },
64 { offsetof(xfs_sb_t
, sb_qflags
), 0 },
65 { offsetof(xfs_sb_t
, sb_flags
), 0 },
66 { offsetof(xfs_sb_t
, sb_shared_vn
), 0 },
67 { offsetof(xfs_sb_t
, sb_inoalignmt
), 0 },
68 { offsetof(xfs_sb_t
, sb_unit
), 0 },
69 { offsetof(xfs_sb_t
, sb_width
), 0 },
70 { offsetof(xfs_sb_t
, sb_dirblklog
), 0 },
71 { offsetof(xfs_sb_t
, sb_logsectlog
), 0 },
72 { offsetof(xfs_sb_t
, sb_logsectsize
), 0 },
73 { offsetof(xfs_sb_t
, sb_logsunit
), 0 },
74 { offsetof(xfs_sb_t
, sb_features2
), 0 },
75 { offsetof(xfs_sb_t
, sb_bad_features2
), 0 },
76 { offsetof(xfs_sb_t
, sb_features_compat
), 0 },
77 { offsetof(xfs_sb_t
, sb_features_ro_compat
), 0 },
78 { offsetof(xfs_sb_t
, sb_features_incompat
), 0 },
79 { offsetof(xfs_sb_t
, sb_features_log_incompat
), 0 },
80 { offsetof(xfs_sb_t
, sb_crc
), 0 },
81 { offsetof(xfs_sb_t
, sb_pad
), 0 },
82 { offsetof(xfs_sb_t
, sb_pquotino
), 0 },
83 { offsetof(xfs_sb_t
, sb_lsn
), 0 },
84 { sizeof(xfs_sb_t
), 0 }
88 * Reference counting access wrappers to the perag structures.
89 * Because we never free per-ag structures, the only thing we
90 * have to protect against changes is the tree structure itself.
97 struct xfs_perag
*pag
;
101 pag
= radix_tree_lookup(&mp
->m_perag_tree
, agno
);
103 ASSERT(atomic_read(&pag
->pag_ref
) >= 0);
104 ref
= atomic_inc_return(&pag
->pag_ref
);
107 trace_xfs_perag_get(mp
, agno
, ref
, _RET_IP_
);
112 * search from @first to find the next perag with the given tag set.
116 struct xfs_mount
*mp
,
117 xfs_agnumber_t first
,
120 struct xfs_perag
*pag
;
125 found
= radix_tree_gang_lookup_tag(&mp
->m_perag_tree
,
126 (void **)&pag
, first
, 1, tag
);
131 ref
= atomic_inc_return(&pag
->pag_ref
);
133 trace_xfs_perag_get_tag(mp
, pag
->pag_agno
, ref
, _RET_IP_
);
139 struct xfs_perag
*pag
)
143 ASSERT(atomic_read(&pag
->pag_ref
) > 0);
144 ref
= atomic_dec_return(&pag
->pag_ref
);
145 trace_xfs_perag_put(pag
->pag_mount
, pag
->pag_agno
, ref
, _RET_IP_
);
149 * Check the validity of the SB found.
152 xfs_mount_validate_sb(
155 bool check_inprogress
,
160 * If the log device and data device have the
161 * same device number, the log is internal.
162 * Consequently, the sb_logstart should be non-zero. If
163 * we have a zero sb_logstart in this case, we may be trying to mount
164 * a volume filesystem in a non-volume manner.
166 if (sbp
->sb_magicnum
!= XFS_SB_MAGIC
) {
167 xfs_warn(mp
, "bad magic number");
168 return XFS_ERROR(EWRONGFS
);
172 if (!xfs_sb_good_version(sbp
)) {
173 xfs_warn(mp
, "bad version");
174 return XFS_ERROR(EWRONGFS
);
178 * Version 5 superblock feature mask validation. Reject combinations the
179 * kernel cannot support up front before checking anything else. For
180 * write validation, we don't need to check feature masks.
182 if (check_version
&& XFS_SB_VERSION_NUM(sbp
) == XFS_SB_VERSION_5
) {
184 "Version 5 superblock detected. xfsprogs has EXPERIMENTAL support enabled!\n"
185 "Use of these features is at your own risk!");
187 if (xfs_sb_has_compat_feature(sbp
,
188 XFS_SB_FEAT_COMPAT_UNKNOWN
)) {
190 "Superblock has unknown compatible features (0x%x) enabled.\n"
191 "Using a more recent xfsprogs is recommended.",
192 (sbp
->sb_features_compat
&
193 XFS_SB_FEAT_COMPAT_UNKNOWN
));
196 if (xfs_sb_has_ro_compat_feature(sbp
,
197 XFS_SB_FEAT_RO_COMPAT_UNKNOWN
)) {
199 "Superblock has unknown read-only compatible features (0x%x) enabled.\n"
200 "Using a more recent xfsprogs is recommended.",
201 (sbp
->sb_features_ro_compat
&
202 XFS_SB_FEAT_RO_COMPAT_UNKNOWN
));
204 if (xfs_sb_has_incompat_feature(sbp
,
205 XFS_SB_FEAT_INCOMPAT_UNKNOWN
)) {
207 "Superblock has unknown incompatible features (0x%x) enabled.\n"
208 "Filesystem can not be safely operated on by this xfsprogs installation",
209 (sbp
->sb_features_incompat
&
210 XFS_SB_FEAT_INCOMPAT_UNKNOWN
));
211 return XFS_ERROR(EINVAL
);
215 if (xfs_sb_version_has_pquotino(sbp
)) {
216 if (sbp
->sb_qflags
& (XFS_OQUOTA_ENFD
| XFS_OQUOTA_CHKD
)) {
218 "Version 5 of Super block has XFS_OQUOTA bits.");
219 return XFS_ERROR(EFSCORRUPTED
);
221 } else if (sbp
->sb_qflags
& (XFS_PQUOTA_ENFD
| XFS_GQUOTA_ENFD
|
222 XFS_PQUOTA_CHKD
| XFS_GQUOTA_CHKD
)) {
224 "Superblock earlier than Version 5 has XFS_[PQ]UOTA_{ENFD|CHKD} bits.");
225 return XFS_ERROR(EFSCORRUPTED
);
229 sbp
->sb_logstart
== 0 && mp
->m_logdev_targp
== mp
->m_ddev_targp
)) {
231 "filesystem is marked as having an external log; "
232 "specify logdev on the mount command line.");
233 return XFS_ERROR(EINVAL
);
237 sbp
->sb_logstart
!= 0 && mp
->m_logdev_targp
!= mp
->m_ddev_targp
)) {
239 "filesystem is marked as having an internal log; "
240 "do not specify logdev on the mount command line.");
241 return XFS_ERROR(EINVAL
);
245 * More sanity checking. Most of these were stolen directly from
249 sbp
->sb_agcount
<= 0 ||
250 sbp
->sb_sectsize
< XFS_MIN_SECTORSIZE
||
251 sbp
->sb_sectsize
> XFS_MAX_SECTORSIZE
||
252 sbp
->sb_sectlog
< XFS_MIN_SECTORSIZE_LOG
||
253 sbp
->sb_sectlog
> XFS_MAX_SECTORSIZE_LOG
||
254 sbp
->sb_sectsize
!= (1 << sbp
->sb_sectlog
) ||
255 sbp
->sb_blocksize
< XFS_MIN_BLOCKSIZE
||
256 sbp
->sb_blocksize
> XFS_MAX_BLOCKSIZE
||
257 sbp
->sb_blocklog
< XFS_MIN_BLOCKSIZE_LOG
||
258 sbp
->sb_blocklog
> XFS_MAX_BLOCKSIZE_LOG
||
259 sbp
->sb_blocksize
!= (1 << sbp
->sb_blocklog
) ||
260 sbp
->sb_inodesize
< XFS_DINODE_MIN_SIZE
||
261 sbp
->sb_inodesize
> XFS_DINODE_MAX_SIZE
||
262 sbp
->sb_inodelog
< XFS_DINODE_MIN_LOG
||
263 sbp
->sb_inodelog
> XFS_DINODE_MAX_LOG
||
264 sbp
->sb_inodesize
!= (1 << sbp
->sb_inodelog
) ||
265 (sbp
->sb_blocklog
- sbp
->sb_inodelog
!= sbp
->sb_inopblog
) ||
266 (sbp
->sb_rextsize
* sbp
->sb_blocksize
> XFS_MAX_RTEXTSIZE
) ||
267 (sbp
->sb_rextsize
* sbp
->sb_blocksize
< XFS_MIN_RTEXTSIZE
) ||
268 (sbp
->sb_imax_pct
> 100 /* zero sb_imax_pct is valid */) ||
269 sbp
->sb_dblocks
== 0 ||
270 sbp
->sb_dblocks
> XFS_MAX_DBLOCKS(sbp
) ||
271 sbp
->sb_dblocks
< XFS_MIN_DBLOCKS(sbp
))) {
272 XFS_CORRUPTION_ERROR("SB sanity check failed",
273 XFS_ERRLEVEL_LOW
, mp
, sbp
);
274 return XFS_ERROR(EFSCORRUPTED
);
278 * Currently only very few inode sizes are supported.
280 switch (sbp
->sb_inodesize
) {
287 xfs_warn(mp
, "inode size of %d bytes not supported",
289 return XFS_ERROR(ENOSYS
);
292 if (xfs_sb_validate_fsb_count(sbp
, sbp
->sb_dblocks
) ||
293 xfs_sb_validate_fsb_count(sbp
, sbp
->sb_rblocks
)) {
295 "file system too large to be mounted on this system.");
296 return XFS_ERROR(EFBIG
);
300 * Version 1 directory format has never worked on Linux.
302 if (unlikely(!xfs_sb_version_hasdirv2(sbp
))) {
303 xfs_warn(mp
, "file system using version 1 directory format");
304 return XFS_ERROR(ENOSYS
);
311 xfs_sb_quota_from_disk(struct xfs_sb
*sbp
)
314 * older mkfs doesn't initialize quota inodes to NULLFSINO. This
315 * leads to in-core values having two different values for a quota
316 * inode to be invalid: 0 and NULLFSINO. Change it to a single value
319 * Note that this change affect only the in-core values. These
320 * values are not written back to disk unless any quota information
321 * is written to the disk. Even in that case, sb_pquotino field is
322 * not written to disk unless the superblock supports pquotino.
324 if (sbp
->sb_uquotino
== 0)
325 sbp
->sb_uquotino
= NULLFSINO
;
326 if (sbp
->sb_gquotino
== 0)
327 sbp
->sb_gquotino
= NULLFSINO
;
328 if (sbp
->sb_pquotino
== 0)
329 sbp
->sb_pquotino
= NULLFSINO
;
332 * We need to do these manipilations only if we are working
333 * with an older version of on-disk superblock.
335 if (xfs_sb_version_has_pquotino(sbp
))
338 if (sbp
->sb_qflags
& XFS_OQUOTA_ENFD
)
339 sbp
->sb_qflags
|= (sbp
->sb_qflags
& XFS_PQUOTA_ACCT
) ?
340 XFS_PQUOTA_ENFD
: XFS_GQUOTA_ENFD
;
341 if (sbp
->sb_qflags
& XFS_OQUOTA_CHKD
)
342 sbp
->sb_qflags
|= (sbp
->sb_qflags
& XFS_PQUOTA_ACCT
) ?
343 XFS_PQUOTA_CHKD
: XFS_GQUOTA_CHKD
;
344 sbp
->sb_qflags
&= ~(XFS_OQUOTA_ENFD
| XFS_OQUOTA_CHKD
);
346 if (sbp
->sb_qflags
& XFS_PQUOTA_ACCT
) {
348 * In older version of superblock, on-disk superblock only
349 * has sb_gquotino, and in-core superblock has both sb_gquotino
350 * and sb_pquotino. But, only one of them is supported at any
351 * point of time. So, if PQUOTA is set in disk superblock,
352 * copy over sb_gquotino to sb_pquotino.
354 sbp
->sb_pquotino
= sbp
->sb_gquotino
;
355 sbp
->sb_gquotino
= NULLFSINO
;
364 to
->sb_magicnum
= be32_to_cpu(from
->sb_magicnum
);
365 to
->sb_blocksize
= be32_to_cpu(from
->sb_blocksize
);
366 to
->sb_dblocks
= be64_to_cpu(from
->sb_dblocks
);
367 to
->sb_rblocks
= be64_to_cpu(from
->sb_rblocks
);
368 to
->sb_rextents
= be64_to_cpu(from
->sb_rextents
);
369 memcpy(&to
->sb_uuid
, &from
->sb_uuid
, sizeof(to
->sb_uuid
));
370 to
->sb_logstart
= be64_to_cpu(from
->sb_logstart
);
371 to
->sb_rootino
= be64_to_cpu(from
->sb_rootino
);
372 to
->sb_rbmino
= be64_to_cpu(from
->sb_rbmino
);
373 to
->sb_rsumino
= be64_to_cpu(from
->sb_rsumino
);
374 to
->sb_rextsize
= be32_to_cpu(from
->sb_rextsize
);
375 to
->sb_agblocks
= be32_to_cpu(from
->sb_agblocks
);
376 to
->sb_agcount
= be32_to_cpu(from
->sb_agcount
);
377 to
->sb_rbmblocks
= be32_to_cpu(from
->sb_rbmblocks
);
378 to
->sb_logblocks
= be32_to_cpu(from
->sb_logblocks
);
379 to
->sb_versionnum
= be16_to_cpu(from
->sb_versionnum
);
380 to
->sb_sectsize
= be16_to_cpu(from
->sb_sectsize
);
381 to
->sb_inodesize
= be16_to_cpu(from
->sb_inodesize
);
382 to
->sb_inopblock
= be16_to_cpu(from
->sb_inopblock
);
383 memcpy(&to
->sb_fname
, &from
->sb_fname
, sizeof(to
->sb_fname
));
384 to
->sb_blocklog
= from
->sb_blocklog
;
385 to
->sb_sectlog
= from
->sb_sectlog
;
386 to
->sb_inodelog
= from
->sb_inodelog
;
387 to
->sb_inopblog
= from
->sb_inopblog
;
388 to
->sb_agblklog
= from
->sb_agblklog
;
389 to
->sb_rextslog
= from
->sb_rextslog
;
390 to
->sb_inprogress
= from
->sb_inprogress
;
391 to
->sb_imax_pct
= from
->sb_imax_pct
;
392 to
->sb_icount
= be64_to_cpu(from
->sb_icount
);
393 to
->sb_ifree
= be64_to_cpu(from
->sb_ifree
);
394 to
->sb_fdblocks
= be64_to_cpu(from
->sb_fdblocks
);
395 to
->sb_frextents
= be64_to_cpu(from
->sb_frextents
);
396 to
->sb_uquotino
= be64_to_cpu(from
->sb_uquotino
);
397 to
->sb_gquotino
= be64_to_cpu(from
->sb_gquotino
);
398 to
->sb_qflags
= be16_to_cpu(from
->sb_qflags
);
399 to
->sb_flags
= from
->sb_flags
;
400 to
->sb_shared_vn
= from
->sb_shared_vn
;
401 to
->sb_inoalignmt
= be32_to_cpu(from
->sb_inoalignmt
);
402 to
->sb_unit
= be32_to_cpu(from
->sb_unit
);
403 to
->sb_width
= be32_to_cpu(from
->sb_width
);
404 to
->sb_dirblklog
= from
->sb_dirblklog
;
405 to
->sb_logsectlog
= from
->sb_logsectlog
;
406 to
->sb_logsectsize
= be16_to_cpu(from
->sb_logsectsize
);
407 to
->sb_logsunit
= be32_to_cpu(from
->sb_logsunit
);
408 to
->sb_features2
= be32_to_cpu(from
->sb_features2
);
409 to
->sb_bad_features2
= be32_to_cpu(from
->sb_bad_features2
);
410 to
->sb_features_compat
= be32_to_cpu(from
->sb_features_compat
);
411 to
->sb_features_ro_compat
= be32_to_cpu(from
->sb_features_ro_compat
);
412 to
->sb_features_incompat
= be32_to_cpu(from
->sb_features_incompat
);
413 to
->sb_features_log_incompat
=
414 be32_to_cpu(from
->sb_features_log_incompat
);
416 to
->sb_pquotino
= be64_to_cpu(from
->sb_pquotino
);
417 to
->sb_lsn
= be64_to_cpu(from
->sb_lsn
);
421 xfs_sb_quota_to_disk(
426 __uint16_t qflags
= from
->sb_qflags
;
429 * We need to do these manipilations only if we are working
430 * with an older version of on-disk superblock.
432 if (xfs_sb_version_has_pquotino(from
))
435 if (*fields
& XFS_SB_QFLAGS
) {
437 * The in-core version of sb_qflags do not have
438 * XFS_OQUOTA_* flags, whereas the on-disk version
439 * does. So, convert incore XFS_{PG}QUOTA_* flags
440 * to on-disk XFS_OQUOTA_* flags.
442 qflags
&= ~(XFS_PQUOTA_ENFD
| XFS_PQUOTA_CHKD
|
443 XFS_GQUOTA_ENFD
| XFS_GQUOTA_CHKD
);
445 if (from
->sb_qflags
&
446 (XFS_PQUOTA_ENFD
| XFS_GQUOTA_ENFD
))
447 qflags
|= XFS_OQUOTA_ENFD
;
448 if (from
->sb_qflags
&
449 (XFS_PQUOTA_CHKD
| XFS_GQUOTA_CHKD
))
450 qflags
|= XFS_OQUOTA_CHKD
;
451 to
->sb_qflags
= cpu_to_be16(qflags
);
452 *fields
&= ~XFS_SB_QFLAGS
;
456 * GQUOTINO and PQUOTINO cannot be used together in versions
457 * of superblock that do not have pquotino. from->sb_flags
458 * tells us which quota is active and should be copied to
461 if ((*fields
& XFS_SB_GQUOTINO
) &&
462 (from
->sb_qflags
& XFS_GQUOTA_ACCT
))
463 to
->sb_gquotino
= cpu_to_be64(from
->sb_gquotino
);
464 else if ((*fields
& XFS_SB_PQUOTINO
) &&
465 (from
->sb_qflags
& XFS_PQUOTA_ACCT
))
466 to
->sb_gquotino
= cpu_to_be64(from
->sb_pquotino
);
468 *fields
&= ~(XFS_SB_PQUOTINO
| XFS_SB_GQUOTINO
);
472 * Copy in core superblock to ondisk one.
474 * The fields argument is mask of superblock fields to copy.
482 xfs_caddr_t to_ptr
= (xfs_caddr_t
)to
;
483 xfs_caddr_t from_ptr
= (xfs_caddr_t
)from
;
492 xfs_sb_quota_to_disk(to
, from
, &fields
);
494 f
= (xfs_sb_field_t
)xfs_lowbit64((__uint64_t
)fields
);
495 first
= xfs_sb_info
[f
].offset
;
496 size
= xfs_sb_info
[f
+ 1].offset
- first
;
498 ASSERT(xfs_sb_info
[f
].type
== 0 || xfs_sb_info
[f
].type
== 1);
500 if (size
== 1 || xfs_sb_info
[f
].type
== 1) {
501 memcpy(to_ptr
+ first
, from_ptr
+ first
, size
);
505 *(__be16
*)(to_ptr
+ first
) =
506 cpu_to_be16(*(__u16
*)(from_ptr
+ first
));
509 *(__be32
*)(to_ptr
+ first
) =
510 cpu_to_be32(*(__u32
*)(from_ptr
+ first
));
513 *(__be64
*)(to_ptr
+ first
) =
514 cpu_to_be64(*(__u64
*)(from_ptr
+ first
));
521 fields
&= ~(1LL << f
);
530 struct xfs_mount
*mp
= bp
->b_target
->bt_mount
;
533 xfs_sb_from_disk(&sb
, XFS_BUF_TO_SBP(bp
));
536 * Only check the in progress field for the primary superblock as
537 * mkfs.xfs doesn't clear it from secondary superblocks.
539 return xfs_mount_validate_sb(mp
, &sb
, bp
->b_bn
== XFS_SB_DADDR
,
544 * If the superblock has the CRC feature bit set or the CRC field is non-null,
545 * check that the CRC is valid. We check the CRC field is non-null because a
546 * single bit error could clear the feature bit and unused parts of the
547 * superblock are supposed to be zero. Hence a non-null crc field indicates that
548 * we've potentially lost a feature bit and we should check it anyway.
554 struct xfs_mount
*mp
= bp
->b_target
->bt_mount
;
555 struct xfs_dsb
*dsb
= XFS_BUF_TO_SBP(bp
);
559 * open code the version check to avoid needing to convert the entire
560 * superblock from disk order just to check the version number
562 if (dsb
->sb_magicnum
== cpu_to_be32(XFS_SB_MAGIC
) &&
563 (((be16_to_cpu(dsb
->sb_versionnum
) & XFS_SB_VERSION_NUMBITS
) ==
567 if (!xfs_verify_cksum(bp
->b_addr
, be16_to_cpu(dsb
->sb_sectsize
),
568 offsetof(struct xfs_sb
, sb_crc
))) {
569 error
= EFSCORRUPTED
;
573 error
= xfs_sb_verify(bp
, true);
577 XFS_CORRUPTION_ERROR(__func__
, XFS_ERRLEVEL_LOW
,
579 xfs_buf_ioerror(bp
, error
);
584 * We may be probed for a filesystem match, so we may not want to emit
585 * messages when the superblock buffer is not actually an XFS superblock.
586 * If we find an XFS superblock, then run a normal, noisy mount because we are
587 * really going to mount it and want to know about errors.
590 xfs_sb_quiet_read_verify(
593 struct xfs_dsb
*dsb
= XFS_BUF_TO_SBP(bp
);
596 if (dsb
->sb_magicnum
== cpu_to_be32(XFS_SB_MAGIC
)) {
597 /* XFS filesystem, verify noisily! */
598 xfs_sb_read_verify(bp
);
602 xfs_buf_ioerror(bp
, EWRONGFS
);
609 struct xfs_mount
*mp
= bp
->b_target
->bt_mount
;
610 struct xfs_buf_log_item
*bip
= bp
->b_fspriv
;
613 error
= xfs_sb_verify(bp
, false);
615 XFS_CORRUPTION_ERROR(__func__
, XFS_ERRLEVEL_LOW
,
617 xfs_buf_ioerror(bp
, error
);
621 if (!xfs_sb_version_hascrc(&mp
->m_sb
))
625 XFS_BUF_TO_SBP(bp
)->sb_lsn
= cpu_to_be64(bip
->bli_item
.li_lsn
);
627 xfs_update_cksum(bp
->b_addr
, BBTOB(bp
->b_length
),
628 offsetof(struct xfs_sb
, sb_crc
));
631 const struct xfs_buf_ops xfs_sb_buf_ops
= {
632 .verify_read
= xfs_sb_read_verify
,
633 .verify_write
= xfs_sb_write_verify
,
636 const struct xfs_buf_ops xfs_sb_quiet_buf_ops
= {
637 .verify_read
= xfs_sb_quiet_read_verify
,
638 .verify_write
= xfs_sb_write_verify
,
644 * Mount initialization code establishing various mount
645 * fields from the superblock associated with the given
650 struct xfs_mount
*mp
,
653 mp
->m_agfrotor
= mp
->m_agirotor
= 0;
654 spin_lock_init(&mp
->m_agirotor_lock
);
655 mp
->m_maxagi
= mp
->m_sb
.sb_agcount
;
656 mp
->m_blkbit_log
= sbp
->sb_blocklog
+ XFS_NBBYLOG
;
657 mp
->m_blkbb_log
= sbp
->sb_blocklog
- BBSHIFT
;
658 mp
->m_sectbb_log
= sbp
->sb_sectlog
- BBSHIFT
;
659 mp
->m_agno_log
= xfs_highbit32(sbp
->sb_agcount
- 1) + 1;
660 mp
->m_agino_log
= sbp
->sb_inopblog
+ sbp
->sb_agblklog
;
661 mp
->m_blockmask
= sbp
->sb_blocksize
- 1;
662 mp
->m_blockwsize
= sbp
->sb_blocksize
>> XFS_WORDLOG
;
663 mp
->m_blockwmask
= mp
->m_blockwsize
- 1;
665 mp
->m_alloc_mxr
[0] = xfs_allocbt_maxrecs(mp
, sbp
->sb_blocksize
, 1);
666 mp
->m_alloc_mxr
[1] = xfs_allocbt_maxrecs(mp
, sbp
->sb_blocksize
, 0);
667 mp
->m_alloc_mnr
[0] = mp
->m_alloc_mxr
[0] / 2;
668 mp
->m_alloc_mnr
[1] = mp
->m_alloc_mxr
[1] / 2;
670 mp
->m_inobt_mxr
[0] = xfs_inobt_maxrecs(mp
, sbp
->sb_blocksize
, 1);
671 mp
->m_inobt_mxr
[1] = xfs_inobt_maxrecs(mp
, sbp
->sb_blocksize
, 0);
672 mp
->m_inobt_mnr
[0] = mp
->m_inobt_mxr
[0] / 2;
673 mp
->m_inobt_mnr
[1] = mp
->m_inobt_mxr
[1] / 2;
675 mp
->m_bmap_dmxr
[0] = xfs_bmbt_maxrecs(mp
, sbp
->sb_blocksize
, 1);
676 mp
->m_bmap_dmxr
[1] = xfs_bmbt_maxrecs(mp
, sbp
->sb_blocksize
, 0);
677 mp
->m_bmap_dmnr
[0] = mp
->m_bmap_dmxr
[0] / 2;
678 mp
->m_bmap_dmnr
[1] = mp
->m_bmap_dmxr
[1] / 2;
680 mp
->m_bsize
= XFS_FSB_TO_BB(mp
, 1);
681 mp
->m_ialloc_inos
= (int)MAX((__uint16_t
)XFS_INODES_PER_CHUNK
,
683 mp
->m_ialloc_blks
= mp
->m_ialloc_inos
>> sbp
->sb_inopblog
;
687 * xfs_initialize_perag_data
689 * Read in each per-ag structure so we can count up the number of
690 * allocated inodes, free inodes and used filesystem blocks as this
691 * information is no longer persistent in the superblock. Once we have
692 * this information, write it into the in-core superblock structure.
695 xfs_initialize_perag_data(
696 struct xfs_mount
*mp
,
697 xfs_agnumber_t agcount
)
699 xfs_agnumber_t index
;
701 xfs_sb_t
*sbp
= &mp
->m_sb
;
705 uint64_t bfreelst
= 0;
709 for (index
= 0; index
< agcount
; index
++) {
711 * read the agf, then the agi. This gets us
712 * all the information we need and populates the
713 * per-ag structures for us.
715 error
= xfs_alloc_pagf_init(mp
, NULL
, index
, 0);
719 error
= xfs_ialloc_pagi_init(mp
, NULL
, index
);
722 pag
= xfs_perag_get(mp
, index
);
723 ifree
+= pag
->pagi_freecount
;
724 ialloc
+= pag
->pagi_count
;
725 bfree
+= pag
->pagf_freeblks
;
726 bfreelst
+= pag
->pagf_flcount
;
727 btree
+= pag
->pagf_btreeblks
;
731 * Overwrite incore superblock counters with just-read data
733 spin_lock(&mp
->m_sb_lock
);
734 sbp
->sb_ifree
= ifree
;
735 sbp
->sb_icount
= ialloc
;
736 sbp
->sb_fdblocks
= bfree
+ bfreelst
+ btree
;
737 spin_unlock(&mp
->m_sb_lock
);
739 /* Fixup the per-cpu counters as well. */
740 xfs_icsb_reinit_counters(mp
);
746 * xfs_mod_sb() can be used to copy arbitrary changes to the
747 * in-core superblock into the superblock buffer to be logged.
748 * It does not provide the higher level of locking that is
749 * needed to protect the in-core superblock from concurrent
753 xfs_mod_sb(xfs_trans_t
*tp
, __int64_t fields
)
765 bp
= xfs_trans_getsb(tp
, mp
, 0);
766 first
= sizeof(xfs_sb_t
);
771 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp
), &mp
->m_sb
, fields
);
773 /* find modified range */
774 f
= (xfs_sb_field_t
)xfs_highbit64((__uint64_t
)fields
);
775 ASSERT((1LL << f
) & XFS_SB_MOD_BITS
);
776 last
= xfs_sb_info
[f
+ 1].offset
- 1;
778 f
= (xfs_sb_field_t
)xfs_lowbit64((__uint64_t
)fields
);
779 ASSERT((1LL << f
) & XFS_SB_MOD_BITS
);
780 first
= xfs_sb_info
[f
].offset
;
782 xfs_trans_buf_set_type(tp
, bp
, XFS_BLFT_SB_BUF
);
783 xfs_trans_log_buf(tp
, bp
, first
, last
);