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Linux/fs/xfs/libxfs/xfs_sb.c

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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_mount.h"
 27 #include "xfs_defer.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_bmap_btree.h"
 37 #include "xfs_alloc_btree.h"
 38 #include "xfs_ialloc_btree.h"
 39 #include "xfs_log.h"
 40 #include "xfs_rmap_btree.h"
 41 #include "xfs_bmap.h"
 42 #include "xfs_refcount_btree.h"
 43 
 44 /*
 45  * Physical superblock buffer manipulations. Shared with libxfs in userspace.
 46  */
 47 
 48 /*
 49  * Reference counting access wrappers to the perag structures.
 50  * Because we never free per-ag structures, the only thing we
 51  * have to protect against changes is the tree structure itself.
 52  */
 53 struct xfs_perag *
 54 xfs_perag_get(
 55         struct xfs_mount        *mp,
 56         xfs_agnumber_t          agno)
 57 {
 58         struct xfs_perag        *pag;
 59         int                     ref = 0;
 60 
 61         rcu_read_lock();
 62         pag = radix_tree_lookup(&mp->m_perag_tree, agno);
 63         if (pag) {
 64                 ASSERT(atomic_read(&pag->pag_ref) >= 0);
 65                 ref = atomic_inc_return(&pag->pag_ref);
 66         }
 67         rcu_read_unlock();
 68         trace_xfs_perag_get(mp, agno, ref, _RET_IP_);
 69         return pag;
 70 }
 71 
 72 /*
 73  * search from @first to find the next perag with the given tag set.
 74  */
 75 struct xfs_perag *
 76 xfs_perag_get_tag(
 77         struct xfs_mount        *mp,
 78         xfs_agnumber_t          first,
 79         int                     tag)
 80 {
 81         struct xfs_perag        *pag;
 82         int                     found;
 83         int                     ref;
 84 
 85         rcu_read_lock();
 86         found = radix_tree_gang_lookup_tag(&mp->m_perag_tree,
 87                                         (void **)&pag, first, 1, tag);
 88         if (found <= 0) {
 89                 rcu_read_unlock();
 90                 return NULL;
 91         }
 92         ref = atomic_inc_return(&pag->pag_ref);
 93         rcu_read_unlock();
 94         trace_xfs_perag_get_tag(mp, pag->pag_agno, ref, _RET_IP_);
 95         return pag;
 96 }
 97 
 98 void
 99 xfs_perag_put(
100         struct xfs_perag        *pag)
101 {
102         int     ref;
103 
104         ASSERT(atomic_read(&pag->pag_ref) > 0);
105         ref = atomic_dec_return(&pag->pag_ref);
106         trace_xfs_perag_put(pag->pag_mount, pag->pag_agno, ref, _RET_IP_);
107 }
108 
109 /*
110  * Check the validity of the SB found.
111  */
112 STATIC int
113 xfs_mount_validate_sb(
114         xfs_mount_t     *mp,
115         xfs_sb_t        *sbp,
116         bool            check_inprogress,
117         bool            check_version)
118 {
119         if (sbp->sb_magicnum != XFS_SB_MAGIC) {
120                 xfs_warn(mp, "bad magic number");
121                 return -EWRONGFS;
122         }
123 
124 
125         if (!xfs_sb_good_version(sbp)) {
126                 xfs_warn(mp, "bad version");
127                 return -EWRONGFS;
128         }
129 
130         /*
131          * Version 5 superblock feature mask validation. Reject combinations the
132          * kernel cannot support up front before checking anything else. For
133          * write validation, we don't need to check feature masks.
134          */
135         if (check_version && XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) {
136                 if (xfs_sb_has_compat_feature(sbp,
137                                         XFS_SB_FEAT_COMPAT_UNKNOWN)) {
138                         xfs_warn(mp,
139 "Superblock has unknown compatible features (0x%x) enabled.",
140                                 (sbp->sb_features_compat &
141                                                 XFS_SB_FEAT_COMPAT_UNKNOWN));
142                         xfs_warn(mp,
143 "Using a more recent kernel is recommended.");
144                 }
145 
146                 if (xfs_sb_has_ro_compat_feature(sbp,
147                                         XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
148                         xfs_alert(mp,
149 "Superblock has unknown read-only compatible features (0x%x) enabled.",
150                                 (sbp->sb_features_ro_compat &
151                                                 XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
152                         if (!(mp->m_flags & XFS_MOUNT_RDONLY)) {
153                                 xfs_warn(mp,
154 "Attempted to mount read-only compatible filesystem read-write.");
155                                 xfs_warn(mp,
156 "Filesystem can only be safely mounted read only.");
157 
158                                 return -EINVAL;
159                         }
160                 }
161                 if (xfs_sb_has_incompat_feature(sbp,
162                                         XFS_SB_FEAT_INCOMPAT_UNKNOWN)) {
163                         xfs_warn(mp,
164 "Superblock has unknown incompatible features (0x%x) enabled.",
165                                 (sbp->sb_features_incompat &
166                                                 XFS_SB_FEAT_INCOMPAT_UNKNOWN));
167                         xfs_warn(mp,
168 "Filesystem can not be safely mounted by this kernel.");
169                         return -EINVAL;
170                 }
171         } else if (xfs_sb_version_hascrc(sbp)) {
172                 /*
173                  * We can't read verify the sb LSN because the read verifier is
174                  * called before the log is allocated and processed. We know the
175                  * log is set up before write verifier (!check_version) calls,
176                  * so just check it here.
177                  */
178                 if (!xfs_log_check_lsn(mp, sbp->sb_lsn))
179                         return -EFSCORRUPTED;
180         }
181 
182         if (xfs_sb_version_has_pquotino(sbp)) {
183                 if (sbp->sb_qflags & (XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD)) {
184                         xfs_notice(mp,
185                            "Version 5 of Super block has XFS_OQUOTA bits.");
186                         return -EFSCORRUPTED;
187                 }
188         } else if (sbp->sb_qflags & (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD |
189                                 XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD)) {
190                         xfs_notice(mp,
191 "Superblock earlier than Version 5 has XFS_[PQ]UOTA_{ENFD|CHKD} bits.");
192                         return -EFSCORRUPTED;
193         }
194 
195         /*
196          * Full inode chunks must be aligned to inode chunk size when
197          * sparse inodes are enabled to support the sparse chunk
198          * allocation algorithm and prevent overlapping inode records.
199          */
200         if (xfs_sb_version_hassparseinodes(sbp)) {
201                 uint32_t        align;
202 
203                 align = XFS_INODES_PER_CHUNK * sbp->sb_inodesize
204                                 >> sbp->sb_blocklog;
205                 if (sbp->sb_inoalignmt != align) {
206                         xfs_warn(mp,
207 "Inode block alignment (%u) must match chunk size (%u) for sparse inodes.",
208                                  sbp->sb_inoalignmt, align);
209                         return -EINVAL;
210                 }
211         }
212 
213         if (unlikely(
214             sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) {
215                 xfs_warn(mp,
216                 "filesystem is marked as having an external log; "
217                 "specify logdev on the mount command line.");
218                 return -EINVAL;
219         }
220 
221         if (unlikely(
222             sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) {
223                 xfs_warn(mp,
224                 "filesystem is marked as having an internal log; "
225                 "do not specify logdev on the mount command line.");
226                 return -EINVAL;
227         }
228 
229         /*
230          * More sanity checking.  Most of these were stolen directly from
231          * xfs_repair.
232          */
233         if (unlikely(
234             sbp->sb_agcount <= 0                                        ||
235             sbp->sb_sectsize < XFS_MIN_SECTORSIZE                       ||
236             sbp->sb_sectsize > XFS_MAX_SECTORSIZE                       ||
237             sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG                    ||
238             sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG                    ||
239             sbp->sb_sectsize != (1 << sbp->sb_sectlog)                  ||
240             sbp->sb_blocksize < XFS_MIN_BLOCKSIZE                       ||
241             sbp->sb_blocksize > XFS_MAX_BLOCKSIZE                       ||
242             sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG                    ||
243             sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG                    ||
244             sbp->sb_blocksize != (1 << sbp->sb_blocklog)                ||
245             sbp->sb_dirblklog + sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG ||
246             sbp->sb_inodesize < XFS_DINODE_MIN_SIZE                     ||
247             sbp->sb_inodesize > XFS_DINODE_MAX_SIZE                     ||
248             sbp->sb_inodelog < XFS_DINODE_MIN_LOG                       ||
249             sbp->sb_inodelog > XFS_DINODE_MAX_LOG                       ||
250             sbp->sb_inodesize != (1 << sbp->sb_inodelog)                ||
251             sbp->sb_logsunit > XLOG_MAX_RECORD_BSIZE                    ||
252             sbp->sb_inopblock != howmany(sbp->sb_blocksize,sbp->sb_inodesize) ||
253             (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog)   ||
254             (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE)  ||
255             (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE)  ||
256             (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */)    ||
257             sbp->sb_dblocks == 0                                        ||
258             sbp->sb_dblocks > XFS_MAX_DBLOCKS(sbp)                      ||
259             sbp->sb_dblocks < XFS_MIN_DBLOCKS(sbp)                      ||
260             sbp->sb_shared_vn != 0)) {
261                 xfs_notice(mp, "SB sanity check failed");
262                 return -EFSCORRUPTED;
263         }
264 
265         if (xfs_sb_version_hascrc(&mp->m_sb) &&
266             sbp->sb_blocksize < XFS_MIN_CRC_BLOCKSIZE) {
267                 xfs_notice(mp, "v5 SB sanity check failed");
268                 return -EFSCORRUPTED;
269         }
270 
271         /*
272          * Until this is fixed only page-sized or smaller data blocks work.
273          */
274         if (unlikely(sbp->sb_blocksize > PAGE_SIZE)) {
275                 xfs_warn(mp,
276                 "File system with blocksize %d bytes. "
277                 "Only pagesize (%ld) or less will currently work.",
278                                 sbp->sb_blocksize, PAGE_SIZE);
279                 return -ENOSYS;
280         }
281 
282         /*
283          * Currently only very few inode sizes are supported.
284          */
285         switch (sbp->sb_inodesize) {
286         case 256:
287         case 512:
288         case 1024:
289         case 2048:
290                 break;
291         default:
292                 xfs_warn(mp, "inode size of %d bytes not supported",
293                                 sbp->sb_inodesize);
294                 return -ENOSYS;
295         }
296 
297         if (xfs_sb_validate_fsb_count(sbp, sbp->sb_dblocks) ||
298             xfs_sb_validate_fsb_count(sbp, sbp->sb_rblocks)) {
299                 xfs_warn(mp,
300                 "file system too large to be mounted on this system.");
301                 return -EFBIG;
302         }
303 
304         if (check_inprogress && sbp->sb_inprogress) {
305                 xfs_warn(mp, "Offline file system operation in progress!");
306                 return -EFSCORRUPTED;
307         }
308         return 0;
309 }
310 
311 void
312 xfs_sb_quota_from_disk(struct xfs_sb *sbp)
313 {
314         /*
315          * older mkfs doesn't initialize quota inodes to NULLFSINO. This
316          * leads to in-core values having two different values for a quota
317          * inode to be invalid: 0 and NULLFSINO. Change it to a single value
318          * NULLFSINO.
319          *
320          * Note that this change affect only the in-core values. These
321          * values are not written back to disk unless any quota information
322          * is written to the disk. Even in that case, sb_pquotino field is
323          * not written to disk unless the superblock supports pquotino.
324          */
325         if (sbp->sb_uquotino == 0)
326                 sbp->sb_uquotino = NULLFSINO;
327         if (sbp->sb_gquotino == 0)
328                 sbp->sb_gquotino = NULLFSINO;
329         if (sbp->sb_pquotino == 0)
330                 sbp->sb_pquotino = NULLFSINO;
331 
332         /*
333          * We need to do these manipilations only if we are working
334          * with an older version of on-disk superblock.
335          */
336         if (xfs_sb_version_has_pquotino(sbp))
337                 return;
338 
339         if (sbp->sb_qflags & XFS_OQUOTA_ENFD)
340                 sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ?
341                                         XFS_PQUOTA_ENFD : XFS_GQUOTA_ENFD;
342         if (sbp->sb_qflags & XFS_OQUOTA_CHKD)
343                 sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ?
344                                         XFS_PQUOTA_CHKD : XFS_GQUOTA_CHKD;
345         sbp->sb_qflags &= ~(XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD);
346 
347         if (sbp->sb_qflags & XFS_PQUOTA_ACCT &&
348             sbp->sb_gquotino != NULLFSINO)  {
349                 /*
350                  * In older version of superblock, on-disk superblock only
351                  * has sb_gquotino, and in-core superblock has both sb_gquotino
352                  * and sb_pquotino. But, only one of them is supported at any
353                  * point of time. So, if PQUOTA is set in disk superblock,
354                  * copy over sb_gquotino to sb_pquotino.  The NULLFSINO test
355                  * above is to make sure we don't do this twice and wipe them
356                  * both out!
357                  */
358                 sbp->sb_pquotino = sbp->sb_gquotino;
359                 sbp->sb_gquotino = NULLFSINO;
360         }
361 }
362 
363 static void
364 __xfs_sb_from_disk(
365         struct xfs_sb   *to,
366         xfs_dsb_t       *from,
367         bool            convert_xquota)
368 {
369         to->sb_magicnum = be32_to_cpu(from->sb_magicnum);
370         to->sb_blocksize = be32_to_cpu(from->sb_blocksize);
371         to->sb_dblocks = be64_to_cpu(from->sb_dblocks);
372         to->sb_rblocks = be64_to_cpu(from->sb_rblocks);
373         to->sb_rextents = be64_to_cpu(from->sb_rextents);
374         memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid));
375         to->sb_logstart = be64_to_cpu(from->sb_logstart);
376         to->sb_rootino = be64_to_cpu(from->sb_rootino);
377         to->sb_rbmino = be64_to_cpu(from->sb_rbmino);
378         to->sb_rsumino = be64_to_cpu(from->sb_rsumino);
379         to->sb_rextsize = be32_to_cpu(from->sb_rextsize);
380         to->sb_agblocks = be32_to_cpu(from->sb_agblocks);
381         to->sb_agcount = be32_to_cpu(from->sb_agcount);
382         to->sb_rbmblocks = be32_to_cpu(from->sb_rbmblocks);
383         to->sb_logblocks = be32_to_cpu(from->sb_logblocks);
384         to->sb_versionnum = be16_to_cpu(from->sb_versionnum);
385         to->sb_sectsize = be16_to_cpu(from->sb_sectsize);
386         to->sb_inodesize = be16_to_cpu(from->sb_inodesize);
387         to->sb_inopblock = be16_to_cpu(from->sb_inopblock);
388         memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname));
389         to->sb_blocklog = from->sb_blocklog;
390         to->sb_sectlog = from->sb_sectlog;
391         to->sb_inodelog = from->sb_inodelog;
392         to->sb_inopblog = from->sb_inopblog;
393         to->sb_agblklog = from->sb_agblklog;
394         to->sb_rextslog = from->sb_rextslog;
395         to->sb_inprogress = from->sb_inprogress;
396         to->sb_imax_pct = from->sb_imax_pct;
397         to->sb_icount = be64_to_cpu(from->sb_icount);
398         to->sb_ifree = be64_to_cpu(from->sb_ifree);
399         to->sb_fdblocks = be64_to_cpu(from->sb_fdblocks);
400         to->sb_frextents = be64_to_cpu(from->sb_frextents);
401         to->sb_uquotino = be64_to_cpu(from->sb_uquotino);
402         to->sb_gquotino = be64_to_cpu(from->sb_gquotino);
403         to->sb_qflags = be16_to_cpu(from->sb_qflags);
404         to->sb_flags = from->sb_flags;
405         to->sb_shared_vn = from->sb_shared_vn;
406         to->sb_inoalignmt = be32_to_cpu(from->sb_inoalignmt);
407         to->sb_unit = be32_to_cpu(from->sb_unit);
408         to->sb_width = be32_to_cpu(from->sb_width);
409         to->sb_dirblklog = from->sb_dirblklog;
410         to->sb_logsectlog = from->sb_logsectlog;
411         to->sb_logsectsize = be16_to_cpu(from->sb_logsectsize);
412         to->sb_logsunit = be32_to_cpu(from->sb_logsunit);
413         to->sb_features2 = be32_to_cpu(from->sb_features2);
414         to->sb_bad_features2 = be32_to_cpu(from->sb_bad_features2);
415         to->sb_features_compat = be32_to_cpu(from->sb_features_compat);
416         to->sb_features_ro_compat = be32_to_cpu(from->sb_features_ro_compat);
417         to->sb_features_incompat = be32_to_cpu(from->sb_features_incompat);
418         to->sb_features_log_incompat =
419                                 be32_to_cpu(from->sb_features_log_incompat);
420         /* crc is only used on disk, not in memory; just init to 0 here. */
421         to->sb_crc = 0;
422         to->sb_spino_align = be32_to_cpu(from->sb_spino_align);
423         to->sb_pquotino = be64_to_cpu(from->sb_pquotino);
424         to->sb_lsn = be64_to_cpu(from->sb_lsn);
425         /*
426          * sb_meta_uuid is only on disk if it differs from sb_uuid and the
427          * feature flag is set; if not set we keep it only in memory.
428          */
429         if (xfs_sb_version_hasmetauuid(to))
430                 uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid);
431         else
432                 uuid_copy(&to->sb_meta_uuid, &from->sb_uuid);
433         /* Convert on-disk flags to in-memory flags? */
434         if (convert_xquota)
435                 xfs_sb_quota_from_disk(to);
436 }
437 
438 void
439 xfs_sb_from_disk(
440         struct xfs_sb   *to,
441         xfs_dsb_t       *from)
442 {
443         __xfs_sb_from_disk(to, from, true);
444 }
445 
446 static void
447 xfs_sb_quota_to_disk(
448         struct xfs_dsb  *to,
449         struct xfs_sb   *from)
450 {
451         uint16_t        qflags = from->sb_qflags;
452 
453         to->sb_uquotino = cpu_to_be64(from->sb_uquotino);
454         if (xfs_sb_version_has_pquotino(from)) {
455                 to->sb_qflags = cpu_to_be16(from->sb_qflags);
456                 to->sb_gquotino = cpu_to_be64(from->sb_gquotino);
457                 to->sb_pquotino = cpu_to_be64(from->sb_pquotino);
458                 return;
459         }
460 
461         /*
462          * The in-core version of sb_qflags do not have XFS_OQUOTA_*
463          * flags, whereas the on-disk version does.  So, convert incore
464          * XFS_{PG}QUOTA_* flags to on-disk XFS_OQUOTA_* flags.
465          */
466         qflags &= ~(XFS_PQUOTA_ENFD | XFS_PQUOTA_CHKD |
467                         XFS_GQUOTA_ENFD | XFS_GQUOTA_CHKD);
468 
469         if (from->sb_qflags &
470                         (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD))
471                 qflags |= XFS_OQUOTA_ENFD;
472         if (from->sb_qflags &
473                         (XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD))
474                 qflags |= XFS_OQUOTA_CHKD;
475         to->sb_qflags = cpu_to_be16(qflags);
476 
477         /*
478          * GQUOTINO and PQUOTINO cannot be used together in versions
479          * of superblock that do not have pquotino. from->sb_flags
480          * tells us which quota is active and should be copied to
481          * disk. If neither are active, we should NULL the inode.
482          *
483          * In all cases, the separate pquotino must remain 0 because it
484          * it beyond the "end" of the valid non-pquotino superblock.
485          */
486         if (from->sb_qflags & XFS_GQUOTA_ACCT)
487                 to->sb_gquotino = cpu_to_be64(from->sb_gquotino);
488         else if (from->sb_qflags & XFS_PQUOTA_ACCT)
489                 to->sb_gquotino = cpu_to_be64(from->sb_pquotino);
490         else {
491                 /*
492                  * We can't rely on just the fields being logged to tell us
493                  * that it is safe to write NULLFSINO - we should only do that
494                  * if quotas are not actually enabled. Hence only write
495                  * NULLFSINO if both in-core quota inodes are NULL.
496                  */
497                 if (from->sb_gquotino == NULLFSINO &&
498                     from->sb_pquotino == NULLFSINO)
499                         to->sb_gquotino = cpu_to_be64(NULLFSINO);
500         }
501 
502         to->sb_pquotino = 0;
503 }
504 
505 void
506 xfs_sb_to_disk(
507         struct xfs_dsb  *to,
508         struct xfs_sb   *from)
509 {
510         xfs_sb_quota_to_disk(to, from);
511 
512         to->sb_magicnum = cpu_to_be32(from->sb_magicnum);
513         to->sb_blocksize = cpu_to_be32(from->sb_blocksize);
514         to->sb_dblocks = cpu_to_be64(from->sb_dblocks);
515         to->sb_rblocks = cpu_to_be64(from->sb_rblocks);
516         to->sb_rextents = cpu_to_be64(from->sb_rextents);
517         memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid));
518         to->sb_logstart = cpu_to_be64(from->sb_logstart);
519         to->sb_rootino = cpu_to_be64(from->sb_rootino);
520         to->sb_rbmino = cpu_to_be64(from->sb_rbmino);
521         to->sb_rsumino = cpu_to_be64(from->sb_rsumino);
522         to->sb_rextsize = cpu_to_be32(from->sb_rextsize);
523         to->sb_agblocks = cpu_to_be32(from->sb_agblocks);
524         to->sb_agcount = cpu_to_be32(from->sb_agcount);
525         to->sb_rbmblocks = cpu_to_be32(from->sb_rbmblocks);
526         to->sb_logblocks = cpu_to_be32(from->sb_logblocks);
527         to->sb_versionnum = cpu_to_be16(from->sb_versionnum);
528         to->sb_sectsize = cpu_to_be16(from->sb_sectsize);
529         to->sb_inodesize = cpu_to_be16(from->sb_inodesize);
530         to->sb_inopblock = cpu_to_be16(from->sb_inopblock);
531         memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname));
532         to->sb_blocklog = from->sb_blocklog;
533         to->sb_sectlog = from->sb_sectlog;
534         to->sb_inodelog = from->sb_inodelog;
535         to->sb_inopblog = from->sb_inopblog;
536         to->sb_agblklog = from->sb_agblklog;
537         to->sb_rextslog = from->sb_rextslog;
538         to->sb_inprogress = from->sb_inprogress;
539         to->sb_imax_pct = from->sb_imax_pct;
540         to->sb_icount = cpu_to_be64(from->sb_icount);
541         to->sb_ifree = cpu_to_be64(from->sb_ifree);
542         to->sb_fdblocks = cpu_to_be64(from->sb_fdblocks);
543         to->sb_frextents = cpu_to_be64(from->sb_frextents);
544 
545         to->sb_flags = from->sb_flags;
546         to->sb_shared_vn = from->sb_shared_vn;
547         to->sb_inoalignmt = cpu_to_be32(from->sb_inoalignmt);
548         to->sb_unit = cpu_to_be32(from->sb_unit);
549         to->sb_width = cpu_to_be32(from->sb_width);
550         to->sb_dirblklog = from->sb_dirblklog;
551         to->sb_logsectlog = from->sb_logsectlog;
552         to->sb_logsectsize = cpu_to_be16(from->sb_logsectsize);
553         to->sb_logsunit = cpu_to_be32(from->sb_logsunit);
554 
555         /*
556          * We need to ensure that bad_features2 always matches features2.
557          * Hence we enforce that here rather than having to remember to do it
558          * everywhere else that updates features2.
559          */
560         from->sb_bad_features2 = from->sb_features2;
561         to->sb_features2 = cpu_to_be32(from->sb_features2);
562         to->sb_bad_features2 = cpu_to_be32(from->sb_bad_features2);
563 
564         if (xfs_sb_version_hascrc(from)) {
565                 to->sb_features_compat = cpu_to_be32(from->sb_features_compat);
566                 to->sb_features_ro_compat =
567                                 cpu_to_be32(from->sb_features_ro_compat);
568                 to->sb_features_incompat =
569                                 cpu_to_be32(from->sb_features_incompat);
570                 to->sb_features_log_incompat =
571                                 cpu_to_be32(from->sb_features_log_incompat);
572                 to->sb_spino_align = cpu_to_be32(from->sb_spino_align);
573                 to->sb_lsn = cpu_to_be64(from->sb_lsn);
574                 if (xfs_sb_version_hasmetauuid(from))
575                         uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid);
576         }
577 }
578 
579 static int
580 xfs_sb_verify(
581         struct xfs_buf  *bp,
582         bool            check_version)
583 {
584         struct xfs_mount *mp = bp->b_target->bt_mount;
585         struct xfs_sb   sb;
586 
587         /*
588          * Use call variant which doesn't convert quota flags from disk 
589          * format, because xfs_mount_validate_sb checks the on-disk flags.
590          */
591         __xfs_sb_from_disk(&sb, XFS_BUF_TO_SBP(bp), false);
592 
593         /*
594          * Only check the in progress field for the primary superblock as
595          * mkfs.xfs doesn't clear it from secondary superblocks.
596          */
597         return xfs_mount_validate_sb(mp, &sb,
598                                      bp->b_maps[0].bm_bn == XFS_SB_DADDR,
599                                      check_version);
600 }
601 
602 /*
603  * If the superblock has the CRC feature bit set or the CRC field is non-null,
604  * check that the CRC is valid.  We check the CRC field is non-null because a
605  * single bit error could clear the feature bit and unused parts of the
606  * superblock are supposed to be zero. Hence a non-null crc field indicates that
607  * we've potentially lost a feature bit and we should check it anyway.
608  *
609  * However, past bugs (i.e. in growfs) left non-zeroed regions beyond the
610  * last field in V4 secondary superblocks.  So for secondary superblocks,
611  * we are more forgiving, and ignore CRC failures if the primary doesn't
612  * indicate that the fs version is V5.
613  */
614 static void
615 xfs_sb_read_verify(
616         struct xfs_buf  *bp)
617 {
618         struct xfs_mount *mp = bp->b_target->bt_mount;
619         struct xfs_dsb  *dsb = XFS_BUF_TO_SBP(bp);
620         int             error;
621 
622         /*
623          * open code the version check to avoid needing to convert the entire
624          * superblock from disk order just to check the version number
625          */
626         if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC) &&
627             (((be16_to_cpu(dsb->sb_versionnum) & XFS_SB_VERSION_NUMBITS) ==
628                                                 XFS_SB_VERSION_5) ||
629              dsb->sb_crc != 0)) {
630 
631                 if (!xfs_buf_verify_cksum(bp, XFS_SB_CRC_OFF)) {
632                         /* Only fail bad secondaries on a known V5 filesystem */
633                         if (bp->b_bn == XFS_SB_DADDR ||
634                             xfs_sb_version_hascrc(&mp->m_sb)) {
635                                 error = -EFSBADCRC;
636                                 goto out_error;
637                         }
638                 }
639         }
640         error = xfs_sb_verify(bp, true);
641 
642 out_error:
643         if (error) {
644                 xfs_buf_ioerror(bp, error);
645                 if (error == -EFSCORRUPTED || error == -EFSBADCRC)
646                         xfs_verifier_error(bp);
647         }
648 }
649 
650 /*
651  * We may be probed for a filesystem match, so we may not want to emit
652  * messages when the superblock buffer is not actually an XFS superblock.
653  * If we find an XFS superblock, then run a normal, noisy mount because we are
654  * really going to mount it and want to know about errors.
655  */
656 static void
657 xfs_sb_quiet_read_verify(
658         struct xfs_buf  *bp)
659 {
660         struct xfs_dsb  *dsb = XFS_BUF_TO_SBP(bp);
661 
662         if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC)) {
663                 /* XFS filesystem, verify noisily! */
664                 xfs_sb_read_verify(bp);
665                 return;
666         }
667         /* quietly fail */
668         xfs_buf_ioerror(bp, -EWRONGFS);
669 }
670 
671 static void
672 xfs_sb_write_verify(
673         struct xfs_buf          *bp)
674 {
675         struct xfs_mount        *mp = bp->b_target->bt_mount;
676         struct xfs_buf_log_item *bip = bp->b_fspriv;
677         int                     error;
678 
679         error = xfs_sb_verify(bp, false);
680         if (error) {
681                 xfs_buf_ioerror(bp, error);
682                 xfs_verifier_error(bp);
683                 return;
684         }
685 
686         if (!xfs_sb_version_hascrc(&mp->m_sb))
687                 return;
688 
689         if (bip)
690                 XFS_BUF_TO_SBP(bp)->sb_lsn = cpu_to_be64(bip->bli_item.li_lsn);
691 
692         xfs_buf_update_cksum(bp, XFS_SB_CRC_OFF);
693 }
694 
695 const struct xfs_buf_ops xfs_sb_buf_ops = {
696         .name = "xfs_sb",
697         .verify_read = xfs_sb_read_verify,
698         .verify_write = xfs_sb_write_verify,
699 };
700 
701 const struct xfs_buf_ops xfs_sb_quiet_buf_ops = {
702         .name = "xfs_sb_quiet",
703         .verify_read = xfs_sb_quiet_read_verify,
704         .verify_write = xfs_sb_write_verify,
705 };
706 
707 /*
708  * xfs_mount_common
709  *
710  * Mount initialization code establishing various mount
711  * fields from the superblock associated with the given
712  * mount structure
713  */
714 void
715 xfs_sb_mount_common(
716         struct xfs_mount *mp,
717         struct xfs_sb   *sbp)
718 {
719         mp->m_agfrotor = mp->m_agirotor = 0;
720         spin_lock_init(&mp->m_agirotor_lock);
721         mp->m_maxagi = mp->m_sb.sb_agcount;
722         mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG;
723         mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT;
724         mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT;
725         mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1;
726         mp->m_agino_log = sbp->sb_inopblog + sbp->sb_agblklog;
727         mp->m_blockmask = sbp->sb_blocksize - 1;
728         mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG;
729         mp->m_blockwmask = mp->m_blockwsize - 1;
730 
731         mp->m_alloc_mxr[0] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 1);
732         mp->m_alloc_mxr[1] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 0);
733         mp->m_alloc_mnr[0] = mp->m_alloc_mxr[0] / 2;
734         mp->m_alloc_mnr[1] = mp->m_alloc_mxr[1] / 2;
735 
736         mp->m_inobt_mxr[0] = xfs_inobt_maxrecs(mp, sbp->sb_blocksize, 1);
737         mp->m_inobt_mxr[1] = xfs_inobt_maxrecs(mp, sbp->sb_blocksize, 0);
738         mp->m_inobt_mnr[0] = mp->m_inobt_mxr[0] / 2;
739         mp->m_inobt_mnr[1] = mp->m_inobt_mxr[1] / 2;
740 
741         mp->m_bmap_dmxr[0] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 1);
742         mp->m_bmap_dmxr[1] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 0);
743         mp->m_bmap_dmnr[0] = mp->m_bmap_dmxr[0] / 2;
744         mp->m_bmap_dmnr[1] = mp->m_bmap_dmxr[1] / 2;
745 
746         mp->m_rmap_mxr[0] = xfs_rmapbt_maxrecs(mp, sbp->sb_blocksize, 1);
747         mp->m_rmap_mxr[1] = xfs_rmapbt_maxrecs(mp, sbp->sb_blocksize, 0);
748         mp->m_rmap_mnr[0] = mp->m_rmap_mxr[0] / 2;
749         mp->m_rmap_mnr[1] = mp->m_rmap_mxr[1] / 2;
750 
751         mp->m_refc_mxr[0] = xfs_refcountbt_maxrecs(mp, sbp->sb_blocksize,
752                         true);
753         mp->m_refc_mxr[1] = xfs_refcountbt_maxrecs(mp, sbp->sb_blocksize,
754                         false);
755         mp->m_refc_mnr[0] = mp->m_refc_mxr[0] / 2;
756         mp->m_refc_mnr[1] = mp->m_refc_mxr[1] / 2;
757 
758         mp->m_bsize = XFS_FSB_TO_BB(mp, 1);
759         mp->m_ialloc_inos = (int)MAX((uint16_t)XFS_INODES_PER_CHUNK,
760                                         sbp->sb_inopblock);
761         mp->m_ialloc_blks = mp->m_ialloc_inos >> sbp->sb_inopblog;
762 
763         if (sbp->sb_spino_align)
764                 mp->m_ialloc_min_blks = sbp->sb_spino_align;
765         else
766                 mp->m_ialloc_min_blks = mp->m_ialloc_blks;
767         mp->m_alloc_set_aside = xfs_alloc_set_aside(mp);
768         mp->m_ag_max_usable = xfs_alloc_ag_max_usable(mp);
769 }
770 
771 /*
772  * xfs_initialize_perag_data
773  *
774  * Read in each per-ag structure so we can count up the number of
775  * allocated inodes, free inodes and used filesystem blocks as this
776  * information is no longer persistent in the superblock. Once we have
777  * this information, write it into the in-core superblock structure.
778  */
779 int
780 xfs_initialize_perag_data(
781         struct xfs_mount *mp,
782         xfs_agnumber_t  agcount)
783 {
784         xfs_agnumber_t  index;
785         xfs_perag_t     *pag;
786         xfs_sb_t        *sbp = &mp->m_sb;
787         uint64_t        ifree = 0;
788         uint64_t        ialloc = 0;
789         uint64_t        bfree = 0;
790         uint64_t        bfreelst = 0;
791         uint64_t        btree = 0;
792         int             error;
793 
794         for (index = 0; index < agcount; index++) {
795                 /*
796                  * read the agf, then the agi. This gets us
797                  * all the information we need and populates the
798                  * per-ag structures for us.
799                  */
800                 error = xfs_alloc_pagf_init(mp, NULL, index, 0);
801                 if (error)
802                         return error;
803 
804                 error = xfs_ialloc_pagi_init(mp, NULL, index);
805                 if (error)
806                         return error;
807                 pag = xfs_perag_get(mp, index);
808                 ifree += pag->pagi_freecount;
809                 ialloc += pag->pagi_count;
810                 bfree += pag->pagf_freeblks;
811                 bfreelst += pag->pagf_flcount;
812                 btree += pag->pagf_btreeblks;
813                 xfs_perag_put(pag);
814         }
815 
816         /* Overwrite incore superblock counters with just-read data */
817         spin_lock(&mp->m_sb_lock);
818         sbp->sb_ifree = ifree;
819         sbp->sb_icount = ialloc;
820         sbp->sb_fdblocks = bfree + bfreelst + btree;
821         spin_unlock(&mp->m_sb_lock);
822 
823         xfs_reinit_percpu_counters(mp);
824 
825         return 0;
826 }
827 
828 /*
829  * xfs_log_sb() can be used to copy arbitrary changes to the in-core superblock
830  * into the superblock buffer to be logged.  It does not provide the higher
831  * level of locking that is needed to protect the in-core superblock from
832  * concurrent access.
833  */
834 void
835 xfs_log_sb(
836         struct xfs_trans        *tp)
837 {
838         struct xfs_mount        *mp = tp->t_mountp;
839         struct xfs_buf          *bp = xfs_trans_getsb(tp, mp, 0);
840 
841         mp->m_sb.sb_icount = percpu_counter_sum(&mp->m_icount);
842         mp->m_sb.sb_ifree = percpu_counter_sum(&mp->m_ifree);
843         mp->m_sb.sb_fdblocks = percpu_counter_sum(&mp->m_fdblocks);
844 
845         xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb);
846         xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF);
847         xfs_trans_log_buf(tp, bp, 0, sizeof(struct xfs_dsb));
848 }
849 
850 /*
851  * xfs_sync_sb
852  *
853  * Sync the superblock to disk.
854  *
855  * Note that the caller is responsible for checking the frozen state of the
856  * filesystem. This procedure uses the non-blocking transaction allocator and
857  * thus will allow modifications to a frozen fs. This is required because this
858  * code can be called during the process of freezing where use of the high-level
859  * allocator would deadlock.
860  */
861 int
862 xfs_sync_sb(
863         struct xfs_mount        *mp,
864         bool                    wait)
865 {
866         struct xfs_trans        *tp;
867         int                     error;
868 
869         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_sb, 0, 0,
870                         XFS_TRANS_NO_WRITECOUNT, &tp);
871         if (error)
872                 return error;
873 
874         xfs_log_sb(tp);
875         if (wait)
876                 xfs_trans_set_sync(tp);
877         return xfs_trans_commit(tp);
878 }
879 

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