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1/*
2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
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.
8 *
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.
13 *
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
17 */
18#include "xfs.h"
19#include "xfs_fs.h"
20#include "xfs_shared.h"
21#include "xfs_format.h"
22#include "xfs_log_format.h"
23#include "xfs_trans_resv.h"
24#include "xfs_bit.h"
25#include "xfs_sb.h"
26#include "xfs_ag.h"
27#include "xfs_mount.h"
28#include "xfs_inode.h"
29#include "xfs_ialloc.h"
30#include "xfs_alloc.h"
31#include "xfs_error.h"
32#include "xfs_trace.h"
33#include "xfs_cksum.h"
34#include "xfs_trans.h"
35#include "xfs_buf_item.h"
36#include "xfs_dinode.h"
37#include "xfs_bmap_btree.h"
38#include "xfs_alloc_btree.h"
39#include "xfs_ialloc_btree.h"
40
41/*
42 * Physical superblock buffer manipulations. Shared with libxfs in userspace.
43 */
44
45static const struct {
46 short offset;
47 short type; /* 0 = integer
48 * 1 = binary / string (no translation)
49 */
50} xfs_sb_info[] = {
51 { offsetof(xfs_sb_t, sb_magicnum), 0 },
52 { offsetof(xfs_sb_t, sb_blocksize), 0 },
53 { offsetof(xfs_sb_t, sb_dblocks), 0 },
54 { offsetof(xfs_sb_t, sb_rblocks), 0 },
55 { offsetof(xfs_sb_t, sb_rextents), 0 },
56 { offsetof(xfs_sb_t, sb_uuid), 1 },
57 { offsetof(xfs_sb_t, sb_logstart), 0 },
58 { offsetof(xfs_sb_t, sb_rootino), 0 },
59 { offsetof(xfs_sb_t, sb_rbmino), 0 },
60 { offsetof(xfs_sb_t, sb_rsumino), 0 },
61 { offsetof(xfs_sb_t, sb_rextsize), 0 },
62 { offsetof(xfs_sb_t, sb_agblocks), 0 },
63 { offsetof(xfs_sb_t, sb_agcount), 0 },
64 { offsetof(xfs_sb_t, sb_rbmblocks), 0 },
65 { offsetof(xfs_sb_t, sb_logblocks), 0 },
66 { offsetof(xfs_sb_t, sb_versionnum), 0 },
67 { offsetof(xfs_sb_t, sb_sectsize), 0 },
68 { offsetof(xfs_sb_t, sb_inodesize), 0 },
69 { offsetof(xfs_sb_t, sb_inopblock), 0 },
70 { offsetof(xfs_sb_t, sb_fname[0]), 1 },
71 { offsetof(xfs_sb_t, sb_blocklog), 0 },
72 { offsetof(xfs_sb_t, sb_sectlog), 0 },
73 { offsetof(xfs_sb_t, sb_inodelog), 0 },
74 { offsetof(xfs_sb_t, sb_inopblog), 0 },
75 { offsetof(xfs_sb_t, sb_agblklog), 0 },
76 { offsetof(xfs_sb_t, sb_rextslog), 0 },
77 { offsetof(xfs_sb_t, sb_inprogress), 0 },
78 { offsetof(xfs_sb_t, sb_imax_pct), 0 },
79 { offsetof(xfs_sb_t, sb_icount), 0 },
80 { offsetof(xfs_sb_t, sb_ifree), 0 },
81 { offsetof(xfs_sb_t, sb_fdblocks), 0 },
82 { offsetof(xfs_sb_t, sb_frextents), 0 },
83 { offsetof(xfs_sb_t, sb_uquotino), 0 },
84 { offsetof(xfs_sb_t, sb_gquotino), 0 },
85 { offsetof(xfs_sb_t, sb_qflags), 0 },
86 { offsetof(xfs_sb_t, sb_flags), 0 },
87 { offsetof(xfs_sb_t, sb_shared_vn), 0 },
88 { offsetof(xfs_sb_t, sb_inoalignmt), 0 },
89 { offsetof(xfs_sb_t, sb_unit), 0 },
90 { offsetof(xfs_sb_t, sb_width), 0 },
91 { offsetof(xfs_sb_t, sb_dirblklog), 0 },
92 { offsetof(xfs_sb_t, sb_logsectlog), 0 },
93 { offsetof(xfs_sb_t, sb_logsectsize), 0 },
94 { offsetof(xfs_sb_t, sb_logsunit), 0 },
95 { offsetof(xfs_sb_t, sb_features2), 0 },
96 { offsetof(xfs_sb_t, sb_bad_features2), 0 },
97 { offsetof(xfs_sb_t, sb_features_compat), 0 },
98 { offsetof(xfs_sb_t, sb_features_ro_compat), 0 },
99 { offsetof(xfs_sb_t, sb_features_incompat), 0 },
100 { offsetof(xfs_sb_t, sb_features_log_incompat), 0 },
101 { offsetof(xfs_sb_t, sb_crc), 0 },
102 { offsetof(xfs_sb_t, sb_pad), 0 },
103 { offsetof(xfs_sb_t, sb_pquotino), 0 },
104 { offsetof(xfs_sb_t, sb_lsn), 0 },
105 { sizeof(xfs_sb_t), 0 }
106};
107
108/*
109 * Reference counting access wrappers to the perag structures.
110 * Because we never free per-ag structures, the only thing we
111 * have to protect against changes is the tree structure itself.
112 */
113struct xfs_perag *
114xfs_perag_get(
115 struct xfs_mount *mp,
116 xfs_agnumber_t agno)
117{
118 struct xfs_perag *pag;
119 int ref = 0;
120
121 rcu_read_lock();
122 pag = radix_tree_lookup(&mp->m_perag_tree, agno);
123 if (pag) {
124 ASSERT(atomic_read(&pag->pag_ref) >= 0);
125 ref = atomic_inc_return(&pag->pag_ref);
126 }
127 rcu_read_unlock();
128 trace_xfs_perag_get(mp, agno, ref, _RET_IP_);
129 return pag;
130}
131
132/*
133 * search from @first to find the next perag with the given tag set.
134 */
135struct xfs_perag *
136xfs_perag_get_tag(
137 struct xfs_mount *mp,
138 xfs_agnumber_t first,
139 int tag)
140{
141 struct xfs_perag *pag;
142 int found;
143 int ref;
144
145 rcu_read_lock();
146 found = radix_tree_gang_lookup_tag(&mp->m_perag_tree,
147 (void **)&pag, first, 1, tag);
148 if (found <= 0) {
149 rcu_read_unlock();
150 return NULL;
151 }
152 ref = atomic_inc_return(&pag->pag_ref);
153 rcu_read_unlock();
154 trace_xfs_perag_get_tag(mp, pag->pag_agno, ref, _RET_IP_);
155 return pag;
156}
157
158void
159xfs_perag_put(
160 struct xfs_perag *pag)
161{
162 int ref;
163
164 ASSERT(atomic_read(&pag->pag_ref) > 0);
165 ref = atomic_dec_return(&pag->pag_ref);
166 trace_xfs_perag_put(pag->pag_mount, pag->pag_agno, ref, _RET_IP_);
167}
168
169/*
170 * Check the validity of the SB found.
171 */
172STATIC int
173xfs_mount_validate_sb(
174 xfs_mount_t *mp,
175 xfs_sb_t *sbp,
176 bool check_inprogress,
177 bool check_version)
178{
179
180 /*
181 * If the log device and data device have the
182 * same device number, the log is internal.
183 * Consequently, the sb_logstart should be non-zero. If
184 * we have a zero sb_logstart in this case, we may be trying to mount
185 * a volume filesystem in a non-volume manner.
186 */
187 if (sbp->sb_magicnum != XFS_SB_MAGIC) {
188 xfs_warn(mp, "bad magic number");
189 return XFS_ERROR(EWRONGFS);
190 }
191
192
193 if (!xfs_sb_good_version(sbp)) {
194 xfs_warn(mp, "bad version");
195 return XFS_ERROR(EWRONGFS);
196 }
197
198 /*
199 * Version 5 superblock feature mask validation. Reject combinations the
200 * kernel cannot support up front before checking anything else. For
201 * write validation, we don't need to check feature masks.
202 */
203 if (check_version && XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) {
204 if (xfs_sb_has_compat_feature(sbp,
205 XFS_SB_FEAT_COMPAT_UNKNOWN)) {
206 xfs_warn(mp,
207"Superblock has unknown compatible features (0x%x) enabled.\n"
208"Using a more recent kernel is recommended.",
209 (sbp->sb_features_compat &
210 XFS_SB_FEAT_COMPAT_UNKNOWN));
211 }
212
213 if (xfs_sb_has_ro_compat_feature(sbp,
214 XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
215 xfs_alert(mp,
216"Superblock has unknown read-only compatible features (0x%x) enabled.",
217 (sbp->sb_features_ro_compat &
218 XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
219 if (!(mp->m_flags & XFS_MOUNT_RDONLY)) {
220 xfs_warn(mp,
221"Attempted to mount read-only compatible filesystem read-write.\n"
222"Filesystem can only be safely mounted read only.");
223 return XFS_ERROR(EINVAL);
224 }
225 }
226 if (xfs_sb_has_incompat_feature(sbp,
227 XFS_SB_FEAT_INCOMPAT_UNKNOWN)) {
228 xfs_warn(mp,
229"Superblock has unknown incompatible features (0x%x) enabled.\n"
230"Filesystem can not be safely mounted by this kernel.",
231 (sbp->sb_features_incompat &
232 XFS_SB_FEAT_INCOMPAT_UNKNOWN));
233 return XFS_ERROR(EINVAL);
234 }
235 }
236
237 if (xfs_sb_version_has_pquotino(sbp)) {
238 if (sbp->sb_qflags & (XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD)) {
239 xfs_notice(mp,
240 "Version 5 of Super block has XFS_OQUOTA bits.");
241 return XFS_ERROR(EFSCORRUPTED);
242 }
243 } else if (sbp->sb_qflags & (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD |
244 XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD)) {
245 xfs_notice(mp,
246"Superblock earlier than Version 5 has XFS_[PQ]UOTA_{ENFD|CHKD} bits.");
247 return XFS_ERROR(EFSCORRUPTED);
248 }
249
250 if (unlikely(
251 sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) {
252 xfs_warn(mp,
253 "filesystem is marked as having an external log; "
254 "specify logdev on the mount command line.");
255 return XFS_ERROR(EINVAL);
256 }
257
258 if (unlikely(
259 sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) {
260 xfs_warn(mp,
261 "filesystem is marked as having an internal log; "
262 "do not specify logdev on the mount command line.");
263 return XFS_ERROR(EINVAL);
264 }
265
266 /*
267 * More sanity checking. Most of these were stolen directly from
268 * xfs_repair.
269 */
270 if (unlikely(
271 sbp->sb_agcount <= 0 ||
272 sbp->sb_sectsize < XFS_MIN_SECTORSIZE ||
273 sbp->sb_sectsize > XFS_MAX_SECTORSIZE ||
274 sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG ||
275 sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG ||
276 sbp->sb_sectsize != (1 << sbp->sb_sectlog) ||
277 sbp->sb_blocksize < XFS_MIN_BLOCKSIZE ||
278 sbp->sb_blocksize > XFS_MAX_BLOCKSIZE ||
279 sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG ||
280 sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG ||
281 sbp->sb_blocksize != (1 << sbp->sb_blocklog) ||
282 sbp->sb_inodesize < XFS_DINODE_MIN_SIZE ||
283 sbp->sb_inodesize > XFS_DINODE_MAX_SIZE ||
284 sbp->sb_inodelog < XFS_DINODE_MIN_LOG ||
285 sbp->sb_inodelog > XFS_DINODE_MAX_LOG ||
286 sbp->sb_inodesize != (1 << sbp->sb_inodelog) ||
287 sbp->sb_inopblock != howmany(sbp->sb_blocksize,sbp->sb_inodesize) ||
288 (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) ||
289 (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) ||
290 (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) ||
291 (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */) ||
292 sbp->sb_dblocks == 0 ||
293 sbp->sb_dblocks > XFS_MAX_DBLOCKS(sbp) ||
294 sbp->sb_dblocks < XFS_MIN_DBLOCKS(sbp))) {
295 xfs_notice(mp, "SB sanity check failed");
296 return XFS_ERROR(EFSCORRUPTED);
297 }
298
299 /*
300 * Until this is fixed only page-sized or smaller data blocks work.
301 */
302 if (unlikely(sbp->sb_blocksize > PAGE_SIZE)) {
303 xfs_warn(mp,
304 "File system with blocksize %d bytes. "
305 "Only pagesize (%ld) or less will currently work.",
306 sbp->sb_blocksize, PAGE_SIZE);
307 return XFS_ERROR(ENOSYS);
308 }
309
310 /*
311 * Currently only very few inode sizes are supported.
312 */
313 switch (sbp->sb_inodesize) {
314 case 256:
315 case 512:
316 case 1024:
317 case 2048:
318 break;
319 default:
320 xfs_warn(mp, "inode size of %d bytes not supported",
321 sbp->sb_inodesize);
322 return XFS_ERROR(ENOSYS);
323 }
324
325 if (xfs_sb_validate_fsb_count(sbp, sbp->sb_dblocks) ||
326 xfs_sb_validate_fsb_count(sbp, sbp->sb_rblocks)) {
327 xfs_warn(mp,
328 "file system too large to be mounted on this system.");
329 return XFS_ERROR(EFBIG);
330 }
331
332 if (check_inprogress && sbp->sb_inprogress) {
333 xfs_warn(mp, "Offline file system operation in progress!");
334 return XFS_ERROR(EFSCORRUPTED);
335 }
336
337 /*
338 * Version 1 directory format has never worked on Linux.
339 */
340 if (unlikely(!xfs_sb_version_hasdirv2(sbp))) {
341 xfs_warn(mp, "file system using version 1 directory format");
342 return XFS_ERROR(ENOSYS);
343 }
344
345 return 0;
346}
347
348void
349xfs_sb_quota_from_disk(struct xfs_sb *sbp)
350{
351 /*
352 * older mkfs doesn't initialize quota inodes to NULLFSINO. This
353 * leads to in-core values having two different values for a quota
354 * inode to be invalid: 0 and NULLFSINO. Change it to a single value
355 * NULLFSINO.
356 *
357 * Note that this change affect only the in-core values. These
358 * values are not written back to disk unless any quota information
359 * is written to the disk. Even in that case, sb_pquotino field is
360 * not written to disk unless the superblock supports pquotino.
361 */
362 if (sbp->sb_uquotino == 0)
363 sbp->sb_uquotino = NULLFSINO;
364 if (sbp->sb_gquotino == 0)
365 sbp->sb_gquotino = NULLFSINO;
366 if (sbp->sb_pquotino == 0)
367 sbp->sb_pquotino = NULLFSINO;
368
369 /*
370 * We need to do these manipilations only if we are working
371 * with an older version of on-disk superblock.
372 */
373 if (xfs_sb_version_has_pquotino(sbp))
374 return;
375
376 if (sbp->sb_qflags & XFS_OQUOTA_ENFD)
377 sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ?
378 XFS_PQUOTA_ENFD : XFS_GQUOTA_ENFD;
379 if (sbp->sb_qflags & XFS_OQUOTA_CHKD)
380 sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ?
381 XFS_PQUOTA_CHKD : XFS_GQUOTA_CHKD;
382 sbp->sb_qflags &= ~(XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD);
383
384 if (sbp->sb_qflags & XFS_PQUOTA_ACCT) {
385 /*
386 * In older version of superblock, on-disk superblock only
387 * has sb_gquotino, and in-core superblock has both sb_gquotino
388 * and sb_pquotino. But, only one of them is supported at any
389 * point of time. So, if PQUOTA is set in disk superblock,
390 * copy over sb_gquotino to sb_pquotino.
391 */
392 sbp->sb_pquotino = sbp->sb_gquotino;
393 sbp->sb_gquotino = NULLFSINO;
394 }
395}
396
397void
398xfs_sb_from_disk(
399 struct xfs_sb *to,
400 xfs_dsb_t *from)
401{
402 to->sb_magicnum = be32_to_cpu(from->sb_magicnum);
403 to->sb_blocksize = be32_to_cpu(from->sb_blocksize);
404 to->sb_dblocks = be64_to_cpu(from->sb_dblocks);
405 to->sb_rblocks = be64_to_cpu(from->sb_rblocks);
406 to->sb_rextents = be64_to_cpu(from->sb_rextents);
407 memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid));
408 to->sb_logstart = be64_to_cpu(from->sb_logstart);
409 to->sb_rootino = be64_to_cpu(from->sb_rootino);
410 to->sb_rbmino = be64_to_cpu(from->sb_rbmino);
411 to->sb_rsumino = be64_to_cpu(from->sb_rsumino);
412 to->sb_rextsize = be32_to_cpu(from->sb_rextsize);
413 to->sb_agblocks = be32_to_cpu(from->sb_agblocks);
414 to->sb_agcount = be32_to_cpu(from->sb_agcount);
415 to->sb_rbmblocks = be32_to_cpu(from->sb_rbmblocks);
416 to->sb_logblocks = be32_to_cpu(from->sb_logblocks);
417 to->sb_versionnum = be16_to_cpu(from->sb_versionnum);
418 to->sb_sectsize = be16_to_cpu(from->sb_sectsize);
419 to->sb_inodesize = be16_to_cpu(from->sb_inodesize);
420 to->sb_inopblock = be16_to_cpu(from->sb_inopblock);
421 memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname));
422 to->sb_blocklog = from->sb_blocklog;
423 to->sb_sectlog = from->sb_sectlog;
424 to->sb_inodelog = from->sb_inodelog;
425 to->sb_inopblog = from->sb_inopblog;
426 to->sb_agblklog = from->sb_agblklog;
427 to->sb_rextslog = from->sb_rextslog;
428 to->sb_inprogress = from->sb_inprogress;
429 to->sb_imax_pct = from->sb_imax_pct;
430 to->sb_icount = be64_to_cpu(from->sb_icount);
431 to->sb_ifree = be64_to_cpu(from->sb_ifree);
432 to->sb_fdblocks = be64_to_cpu(from->sb_fdblocks);
433 to->sb_frextents = be64_to_cpu(from->sb_frextents);
434 to->sb_uquotino = be64_to_cpu(from->sb_uquotino);
435 to->sb_gquotino = be64_to_cpu(from->sb_gquotino);
436 to->sb_qflags = be16_to_cpu(from->sb_qflags);
437 to->sb_flags = from->sb_flags;
438 to->sb_shared_vn = from->sb_shared_vn;
439 to->sb_inoalignmt = be32_to_cpu(from->sb_inoalignmt);
440 to->sb_unit = be32_to_cpu(from->sb_unit);
441 to->sb_width = be32_to_cpu(from->sb_width);
442 to->sb_dirblklog = from->sb_dirblklog;
443 to->sb_logsectlog = from->sb_logsectlog;
444 to->sb_logsectsize = be16_to_cpu(from->sb_logsectsize);
445 to->sb_logsunit = be32_to_cpu(from->sb_logsunit);
446 to->sb_features2 = be32_to_cpu(from->sb_features2);
447 to->sb_bad_features2 = be32_to_cpu(from->sb_bad_features2);
448 to->sb_features_compat = be32_to_cpu(from->sb_features_compat);
449 to->sb_features_ro_compat = be32_to_cpu(from->sb_features_ro_compat);
450 to->sb_features_incompat = be32_to_cpu(from->sb_features_incompat);
451 to->sb_features_log_incompat =
452 be32_to_cpu(from->sb_features_log_incompat);
453 to->sb_pad = 0;
454 to->sb_pquotino = be64_to_cpu(from->sb_pquotino);
455 to->sb_lsn = be64_to_cpu(from->sb_lsn);
456}
457
458static inline void
459xfs_sb_quota_to_disk(
460 xfs_dsb_t *to,
461 xfs_sb_t *from,
462 __int64_t *fields)
463{
464 __uint16_t qflags = from->sb_qflags;
465
466 /*
467 * We need to do these manipilations only if we are working
468 * with an older version of on-disk superblock.
469 */
470 if (xfs_sb_version_has_pquotino(from))
471 return;
472
473 if (*fields & XFS_SB_QFLAGS) {
474 /*
475 * The in-core version of sb_qflags do not have
476 * XFS_OQUOTA_* flags, whereas the on-disk version
477 * does. So, convert incore XFS_{PG}QUOTA_* flags
478 * to on-disk XFS_OQUOTA_* flags.
479 */
480 qflags &= ~(XFS_PQUOTA_ENFD | XFS_PQUOTA_CHKD |
481 XFS_GQUOTA_ENFD | XFS_GQUOTA_CHKD);
482
483 if (from->sb_qflags &
484 (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD))
485 qflags |= XFS_OQUOTA_ENFD;
486 if (from->sb_qflags &
487 (XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD))
488 qflags |= XFS_OQUOTA_CHKD;
489 to->sb_qflags = cpu_to_be16(qflags);
490 *fields &= ~XFS_SB_QFLAGS;
491 }
492
493 /*
494 * GQUOTINO and PQUOTINO cannot be used together in versions
495 * of superblock that do not have pquotino. from->sb_flags
496 * tells us which quota is active and should be copied to
497 * disk.
498 */
499 if ((*fields & XFS_SB_GQUOTINO) &&
500 (from->sb_qflags & XFS_GQUOTA_ACCT))
501 to->sb_gquotino = cpu_to_be64(from->sb_gquotino);
502 else if ((*fields & XFS_SB_PQUOTINO) &&
503 (from->sb_qflags & XFS_PQUOTA_ACCT))
504 to->sb_gquotino = cpu_to_be64(from->sb_pquotino);
505
506 *fields &= ~(XFS_SB_PQUOTINO | XFS_SB_GQUOTINO);
507}
508
509/*
510 * Copy in core superblock to ondisk one.
511 *
512 * The fields argument is mask of superblock fields to copy.
513 */
514void
515xfs_sb_to_disk(
516 xfs_dsb_t *to,
517 xfs_sb_t *from,
518 __int64_t fields)
519{
520 xfs_caddr_t to_ptr = (xfs_caddr_t)to;
521 xfs_caddr_t from_ptr = (xfs_caddr_t)from;
522 xfs_sb_field_t f;
523 int first;
524 int size;
525
526 ASSERT(fields);
527 if (!fields)
528 return;
529
530 xfs_sb_quota_to_disk(to, from, &fields);
531 while (fields) {
532 f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields);
533 first = xfs_sb_info[f].offset;
534 size = xfs_sb_info[f + 1].offset - first;
535
536 ASSERT(xfs_sb_info[f].type == 0 || xfs_sb_info[f].type == 1);
537
538 if (size == 1 || xfs_sb_info[f].type == 1) {
539 memcpy(to_ptr + first, from_ptr + first, size);
540 } else {
541 switch (size) {
542 case 2:
543 *(__be16 *)(to_ptr + first) =
544 cpu_to_be16(*(__u16 *)(from_ptr + first));
545 break;
546 case 4:
547 *(__be32 *)(to_ptr + first) =
548 cpu_to_be32(*(__u32 *)(from_ptr + first));
549 break;
550 case 8:
551 *(__be64 *)(to_ptr + first) =
552 cpu_to_be64(*(__u64 *)(from_ptr + first));
553 break;
554 default:
555 ASSERT(0);
556 }
557 }
558
559 fields &= ~(1LL << f);
560 }
561}
562
563static int
564xfs_sb_verify(
565 struct xfs_buf *bp,
566 bool check_version)
567{
568 struct xfs_mount *mp = bp->b_target->bt_mount;
569 struct xfs_sb sb;
570
571 xfs_sb_from_disk(&sb, XFS_BUF_TO_SBP(bp));
572
573 /*
574 * Only check the in progress field for the primary superblock as
575 * mkfs.xfs doesn't clear it from secondary superblocks.
576 */
577 return xfs_mount_validate_sb(mp, &sb, bp->b_bn == XFS_SB_DADDR,
578 check_version);
579}
580
581/*
582 * If the superblock has the CRC feature bit set or the CRC field is non-null,
583 * check that the CRC is valid. We check the CRC field is non-null because a
584 * single bit error could clear the feature bit and unused parts of the
585 * superblock are supposed to be zero. Hence a non-null crc field indicates that
586 * we've potentially lost a feature bit and we should check it anyway.
587 *
588 * However, past bugs (i.e. in growfs) left non-zeroed regions beyond the
589 * last field in V4 secondary superblocks. So for secondary superblocks,
590 * we are more forgiving, and ignore CRC failures if the primary doesn't
591 * indicate that the fs version is V5.
592 */
593static void
594xfs_sb_read_verify(
595 struct xfs_buf *bp)
596{
597 struct xfs_mount *mp = bp->b_target->bt_mount;
598 struct xfs_dsb *dsb = XFS_BUF_TO_SBP(bp);
599 int error;
600
601 /*
602 * open code the version check to avoid needing to convert the entire
603 * superblock from disk order just to check the version number
604 */
605 if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC) &&
606 (((be16_to_cpu(dsb->sb_versionnum) & XFS_SB_VERSION_NUMBITS) ==
607 XFS_SB_VERSION_5) ||
608 dsb->sb_crc != 0)) {
609
610 if (!xfs_buf_verify_cksum(bp, XFS_SB_CRC_OFF)) {
611 /* Only fail bad secondaries on a known V5 filesystem */
612 if (bp->b_bn == XFS_SB_DADDR ||
613 xfs_sb_version_hascrc(&mp->m_sb)) {
614 error = EFSBADCRC;
615 goto out_error;
616 }
617 }
618 }
619 error = xfs_sb_verify(bp, true);
620
621out_error:
622 if (error) {
623 xfs_buf_ioerror(bp, error);
624 if (error == EFSCORRUPTED || error == EFSBADCRC)
625 xfs_verifier_error(bp);
626 }
627}
628
629/*
630 * We may be probed for a filesystem match, so we may not want to emit
631 * messages when the superblock buffer is not actually an XFS superblock.
632 * If we find an XFS superblock, then run a normal, noisy mount because we are
633 * really going to mount it and want to know about errors.
634 */
635static void
636xfs_sb_quiet_read_verify(
637 struct xfs_buf *bp)
638{
639 struct xfs_dsb *dsb = XFS_BUF_TO_SBP(bp);
640
641 if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC)) {
642 /* XFS filesystem, verify noisily! */
643 xfs_sb_read_verify(bp);
644 return;
645 }
646 /* quietly fail */
647 xfs_buf_ioerror(bp, EWRONGFS);
648}
649
650static void
651xfs_sb_write_verify(
652 struct xfs_buf *bp)
653{
654 struct xfs_mount *mp = bp->b_target->bt_mount;
655 struct xfs_buf_log_item *bip = bp->b_fspriv;
656 int error;
657
658 error = xfs_sb_verify(bp, false);
659 if (error) {
660 xfs_buf_ioerror(bp, error);
661 xfs_verifier_error(bp);
662 return;
663 }
664
665 if (!xfs_sb_version_hascrc(&mp->m_sb))
666 return;
667
668 if (bip)
669 XFS_BUF_TO_SBP(bp)->sb_lsn = cpu_to_be64(bip->bli_item.li_lsn);
670
671 xfs_buf_update_cksum(bp, XFS_SB_CRC_OFF);
672}
673
674const struct xfs_buf_ops xfs_sb_buf_ops = {
675 .verify_read = xfs_sb_read_verify,
676 .verify_write = xfs_sb_write_verify,
677};
678
679const struct xfs_buf_ops xfs_sb_quiet_buf_ops = {
680 .verify_read = xfs_sb_quiet_read_verify,
681 .verify_write = xfs_sb_write_verify,
682};
683
684/*
685 * xfs_mount_common
686 *
687 * Mount initialization code establishing various mount
688 * fields from the superblock associated with the given
689 * mount structure
690 */
691void
692xfs_sb_mount_common(
693 struct xfs_mount *mp,
694 struct xfs_sb *sbp)
695{
696 mp->m_agfrotor = mp->m_agirotor = 0;
697 spin_lock_init(&mp->m_agirotor_lock);
698 mp->m_maxagi = mp->m_sb.sb_agcount;
699 mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG;
700 mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT;
701 mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT;
702 mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1;
703 mp->m_agino_log = sbp->sb_inopblog + sbp->sb_agblklog;
704 mp->m_blockmask = sbp->sb_blocksize - 1;
705 mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG;
706 mp->m_blockwmask = mp->m_blockwsize - 1;
707
708 mp->m_alloc_mxr[0] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 1);
709 mp->m_alloc_mxr[1] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 0);
710 mp->m_alloc_mnr[0] = mp->m_alloc_mxr[0] / 2;
711 mp->m_alloc_mnr[1] = mp->m_alloc_mxr[1] / 2;
712
713 mp->m_inobt_mxr[0] = xfs_inobt_maxrecs(mp, sbp->sb_blocksize, 1);
714 mp->m_inobt_mxr[1] = xfs_inobt_maxrecs(mp, sbp->sb_blocksize, 0);
715 mp->m_inobt_mnr[0] = mp->m_inobt_mxr[0] / 2;
716 mp->m_inobt_mnr[1] = mp->m_inobt_mxr[1] / 2;
717
718 mp->m_bmap_dmxr[0] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 1);
719 mp->m_bmap_dmxr[1] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 0);
720 mp->m_bmap_dmnr[0] = mp->m_bmap_dmxr[0] / 2;
721 mp->m_bmap_dmnr[1] = mp->m_bmap_dmxr[1] / 2;
722
723 mp->m_bsize = XFS_FSB_TO_BB(mp, 1);
724 mp->m_ialloc_inos = (int)MAX((__uint16_t)XFS_INODES_PER_CHUNK,
725 sbp->sb_inopblock);
726 mp->m_ialloc_blks = mp->m_ialloc_inos >> sbp->sb_inopblog;
727}
728
729/*
730 * xfs_initialize_perag_data
731 *
732 * Read in each per-ag structure so we can count up the number of
733 * allocated inodes, free inodes and used filesystem blocks as this
734 * information is no longer persistent in the superblock. Once we have
735 * this information, write it into the in-core superblock structure.
736 */
737int
738xfs_initialize_perag_data(
739 struct xfs_mount *mp,
740 xfs_agnumber_t agcount)
741{
742 xfs_agnumber_t index;
743 xfs_perag_t *pag;
744 xfs_sb_t *sbp = &mp->m_sb;
745 uint64_t ifree = 0;
746 uint64_t ialloc = 0;
747 uint64_t bfree = 0;
748 uint64_t bfreelst = 0;
749 uint64_t btree = 0;
750 int error;
751
752 for (index = 0; index < agcount; index++) {
753 /*
754 * read the agf, then the agi. This gets us
755 * all the information we need and populates the
756 * per-ag structures for us.
757 */
758 error = xfs_alloc_pagf_init(mp, NULL, index, 0);
759 if (error)
760 return error;
761
762 error = xfs_ialloc_pagi_init(mp, NULL, index);
763 if (error)
764 return error;
765 pag = xfs_perag_get(mp, index);
766 ifree += pag->pagi_freecount;
767 ialloc += pag->pagi_count;
768 bfree += pag->pagf_freeblks;
769 bfreelst += pag->pagf_flcount;
770 btree += pag->pagf_btreeblks;
771 xfs_perag_put(pag);
772 }
773 /*
774 * Overwrite incore superblock counters with just-read data
775 */
776 spin_lock(&mp->m_sb_lock);
777 sbp->sb_ifree = ifree;
778 sbp->sb_icount = ialloc;
779 sbp->sb_fdblocks = bfree + bfreelst + btree;
780 spin_unlock(&mp->m_sb_lock);
781
782 /* Fixup the per-cpu counters as well. */
783 xfs_icsb_reinit_counters(mp);
784
785 return 0;
786}
787
788/*
789 * xfs_mod_sb() can be used to copy arbitrary changes to the
790 * in-core superblock into the superblock buffer to be logged.
791 * It does not provide the higher level of locking that is
792 * needed to protect the in-core superblock from concurrent
793 * access.
794 */
795void
796xfs_mod_sb(xfs_trans_t *tp, __int64_t fields)
797{
798 xfs_buf_t *bp;
799 int first;
800 int last;
801 xfs_mount_t *mp;
802 xfs_sb_field_t f;
803
804 ASSERT(fields);
805 if (!fields)
806 return;
807 mp = tp->t_mountp;
808 bp = xfs_trans_getsb(tp, mp, 0);
809 first = sizeof(xfs_sb_t);
810 last = 0;
811
812 /* translate/copy */
813
814 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, fields);
815
816 /* find modified range */
817 f = (xfs_sb_field_t)xfs_highbit64((__uint64_t)fields);
818 ASSERT((1LL << f) & XFS_SB_MOD_BITS);
819 last = xfs_sb_info[f + 1].offset - 1;
820
821 f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields);
822 ASSERT((1LL << f) & XFS_SB_MOD_BITS);
823 first = xfs_sb_info[f].offset;
824
825 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF);
826 xfs_trans_log_buf(tp, bp, first, last);
827}