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Linux/fs/xfs/libxfs/xfs_sb.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
  4  * All Rights Reserved.
  5  */
  6 #include "xfs.h"
  7 #include "xfs_fs.h"
  8 #include "xfs_shared.h"
  9 #include "xfs_format.h"
 10 #include "xfs_log_format.h"
 11 #include "xfs_trans_resv.h"
 12 #include "xfs_bit.h"
 13 #include "xfs_mount.h"
 14 #include "xfs_ialloc.h"
 15 #include "xfs_alloc.h"
 16 #include "xfs_error.h"
 17 #include "xfs_trace.h"
 18 #include "xfs_trans.h"
 19 #include "xfs_buf_item.h"
 20 #include "xfs_bmap_btree.h"
 21 #include "xfs_alloc_btree.h"
 22 #include "xfs_log.h"
 23 #include "xfs_rmap_btree.h"
 24 #include "xfs_refcount_btree.h"
 25 #include "xfs_da_format.h"
 26 #include "xfs_health.h"
 27 
 28 /*
 29  * Physical superblock buffer manipulations. Shared with libxfs in userspace.
 30  */
 31 
 32 /*
 33  * Reference counting access wrappers to the perag structures.
 34  * Because we never free per-ag structures, the only thing we
 35  * have to protect against changes is the tree structure itself.
 36  */
 37 struct xfs_perag *
 38 xfs_perag_get(
 39         struct xfs_mount        *mp,
 40         xfs_agnumber_t          agno)
 41 {
 42         struct xfs_perag        *pag;
 43         int                     ref = 0;
 44 
 45         rcu_read_lock();
 46         pag = radix_tree_lookup(&mp->m_perag_tree, agno);
 47         if (pag) {
 48                 ASSERT(atomic_read(&pag->pag_ref) >= 0);
 49                 ref = atomic_inc_return(&pag->pag_ref);
 50         }
 51         rcu_read_unlock();
 52         trace_xfs_perag_get(mp, agno, ref, _RET_IP_);
 53         return pag;
 54 }
 55 
 56 /*
 57  * search from @first to find the next perag with the given tag set.
 58  */
 59 struct xfs_perag *
 60 xfs_perag_get_tag(
 61         struct xfs_mount        *mp,
 62         xfs_agnumber_t          first,
 63         int                     tag)
 64 {
 65         struct xfs_perag        *pag;
 66         int                     found;
 67         int                     ref;
 68 
 69         rcu_read_lock();
 70         found = radix_tree_gang_lookup_tag(&mp->m_perag_tree,
 71                                         (void **)&pag, first, 1, tag);
 72         if (found <= 0) {
 73                 rcu_read_unlock();
 74                 return NULL;
 75         }
 76         ref = atomic_inc_return(&pag->pag_ref);
 77         rcu_read_unlock();
 78         trace_xfs_perag_get_tag(mp, pag->pag_agno, ref, _RET_IP_);
 79         return pag;
 80 }
 81 
 82 void
 83 xfs_perag_put(
 84         struct xfs_perag        *pag)
 85 {
 86         int     ref;
 87 
 88         ASSERT(atomic_read(&pag->pag_ref) > 0);
 89         ref = atomic_dec_return(&pag->pag_ref);
 90         trace_xfs_perag_put(pag->pag_mount, pag->pag_agno, ref, _RET_IP_);
 91 }
 92 
 93 /* Check all the superblock fields we care about when reading one in. */
 94 STATIC int
 95 xfs_validate_sb_read(
 96         struct xfs_mount        *mp,
 97         struct xfs_sb           *sbp)
 98 {
 99         if (XFS_SB_VERSION_NUM(sbp) != XFS_SB_VERSION_5)
100                 return 0;
101 
102         /*
103          * Version 5 superblock feature mask validation. Reject combinations
104          * the kernel cannot support up front before checking anything else.
105          */
106         if (xfs_sb_has_compat_feature(sbp, XFS_SB_FEAT_COMPAT_UNKNOWN)) {
107                 xfs_warn(mp,
108 "Superblock has unknown compatible features (0x%x) enabled.",
109                         (sbp->sb_features_compat & XFS_SB_FEAT_COMPAT_UNKNOWN));
110                 xfs_warn(mp,
111 "Using a more recent kernel is recommended.");
112         }
113 
114         if (xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
115                 xfs_alert(mp,
116 "Superblock has unknown read-only compatible features (0x%x) enabled.",
117                         (sbp->sb_features_ro_compat &
118                                         XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
119                 if (!(mp->m_flags & XFS_MOUNT_RDONLY)) {
120                         xfs_warn(mp,
121 "Attempted to mount read-only compatible filesystem read-write.");
122                         xfs_warn(mp,
123 "Filesystem can only be safely mounted read only.");
124 
125                         return -EINVAL;
126                 }
127         }
128         if (xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_UNKNOWN)) {
129                 xfs_warn(mp,
130 "Superblock has unknown incompatible features (0x%x) enabled.",
131                         (sbp->sb_features_incompat &
132                                         XFS_SB_FEAT_INCOMPAT_UNKNOWN));
133                 xfs_warn(mp,
134 "Filesystem cannot be safely mounted by this kernel.");
135                 return -EINVAL;
136         }
137 
138         return 0;
139 }
140 
141 /* Check all the superblock fields we care about when writing one out. */
142 STATIC int
143 xfs_validate_sb_write(
144         struct xfs_mount        *mp,
145         struct xfs_buf          *bp,
146         struct xfs_sb           *sbp)
147 {
148         /*
149          * Carry out additional sb summary counter sanity checks when we write
150          * the superblock.  We skip this in the read validator because there
151          * could be newer superblocks in the log and if the values are garbage
152          * even after replay we'll recalculate them at the end of log mount.
153          *
154          * mkfs has traditionally written zeroed counters to inprogress and
155          * secondary superblocks, so allow this usage to continue because
156          * we never read counters from such superblocks.
157          */
158         if (XFS_BUF_ADDR(bp) == XFS_SB_DADDR && !sbp->sb_inprogress &&
159             (sbp->sb_fdblocks > sbp->sb_dblocks ||
160              !xfs_verify_icount(mp, sbp->sb_icount) ||
161              sbp->sb_ifree > sbp->sb_icount)) {
162                 xfs_warn(mp, "SB summary counter sanity check failed");
163                 return -EFSCORRUPTED;
164         }
165 
166         if (XFS_SB_VERSION_NUM(sbp) != XFS_SB_VERSION_5)
167                 return 0;
168 
169         /*
170          * Version 5 superblock feature mask validation. Reject combinations
171          * the kernel cannot support since we checked for unsupported bits in
172          * the read verifier, which means that memory is corrupt.
173          */
174         if (xfs_sb_has_compat_feature(sbp, XFS_SB_FEAT_COMPAT_UNKNOWN)) {
175                 xfs_warn(mp,
176 "Corruption detected in superblock compatible features (0x%x)!",
177                         (sbp->sb_features_compat & XFS_SB_FEAT_COMPAT_UNKNOWN));
178                 return -EFSCORRUPTED;
179         }
180 
181         if (xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
182                 xfs_alert(mp,
183 "Corruption detected in superblock read-only compatible features (0x%x)!",
184                         (sbp->sb_features_ro_compat &
185                                         XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
186                 return -EFSCORRUPTED;
187         }
188         if (xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_UNKNOWN)) {
189                 xfs_warn(mp,
190 "Corruption detected in superblock incompatible features (0x%x)!",
191                         (sbp->sb_features_incompat &
192                                         XFS_SB_FEAT_INCOMPAT_UNKNOWN));
193                 return -EFSCORRUPTED;
194         }
195         if (xfs_sb_has_incompat_log_feature(sbp,
196                         XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN)) {
197                 xfs_warn(mp,
198 "Corruption detected in superblock incompatible log features (0x%x)!",
199                         (sbp->sb_features_log_incompat &
200                                         XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN));
201                 return -EFSCORRUPTED;
202         }
203 
204         /*
205          * We can't read verify the sb LSN because the read verifier is called
206          * before the log is allocated and processed. We know the log is set up
207          * before write verifier calls, so check it here.
208          */
209         if (!xfs_log_check_lsn(mp, sbp->sb_lsn))
210                 return -EFSCORRUPTED;
211 
212         return 0;
213 }
214 
215 /* Check the validity of the SB. */
216 STATIC int
217 xfs_validate_sb_common(
218         struct xfs_mount        *mp,
219         struct xfs_buf          *bp,
220         struct xfs_sb           *sbp)
221 {
222         struct xfs_dsb          *dsb = XFS_BUF_TO_SBP(bp);
223         uint32_t                agcount = 0;
224         uint32_t                rem;
225 
226         if (!xfs_verify_magic(bp, dsb->sb_magicnum)) {
227                 xfs_warn(mp, "bad magic number");
228                 return -EWRONGFS;
229         }
230 
231         if (!xfs_sb_good_version(sbp)) {
232                 xfs_warn(mp, "bad version");
233                 return -EWRONGFS;
234         }
235 
236         if (xfs_sb_version_has_pquotino(sbp)) {
237                 if (sbp->sb_qflags & (XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD)) {
238                         xfs_notice(mp,
239                            "Version 5 of Super block has XFS_OQUOTA bits.");
240                         return -EFSCORRUPTED;
241                 }
242         } else if (sbp->sb_qflags & (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD |
243                                 XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD)) {
244                         xfs_notice(mp,
245 "Superblock earlier than Version 5 has XFS_[PQ]UOTA_{ENFD|CHKD} bits.");
246                         return -EFSCORRUPTED;
247         }
248 
249         /*
250          * Full inode chunks must be aligned to inode chunk size when
251          * sparse inodes are enabled to support the sparse chunk
252          * allocation algorithm and prevent overlapping inode records.
253          */
254         if (xfs_sb_version_hassparseinodes(sbp)) {
255                 uint32_t        align;
256 
257                 align = XFS_INODES_PER_CHUNK * sbp->sb_inodesize
258                                 >> sbp->sb_blocklog;
259                 if (sbp->sb_inoalignmt != align) {
260                         xfs_warn(mp,
261 "Inode block alignment (%u) must match chunk size (%u) for sparse inodes.",
262                                  sbp->sb_inoalignmt, align);
263                         return -EINVAL;
264                 }
265         }
266 
267         if (unlikely(
268             sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) {
269                 xfs_warn(mp,
270                 "filesystem is marked as having an external log; "
271                 "specify logdev on the mount command line.");
272                 return -EINVAL;
273         }
274 
275         if (unlikely(
276             sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) {
277                 xfs_warn(mp,
278                 "filesystem is marked as having an internal log; "
279                 "do not specify logdev on the mount command line.");
280                 return -EINVAL;
281         }
282 
283         /* Compute agcount for this number of dblocks and agblocks */
284         if (sbp->sb_agblocks) {
285                 agcount = div_u64_rem(sbp->sb_dblocks, sbp->sb_agblocks, &rem);
286                 if (rem)
287                         agcount++;
288         }
289 
290         /*
291          * More sanity checking.  Most of these were stolen directly from
292          * xfs_repair.
293          */
294         if (unlikely(
295             sbp->sb_agcount <= 0                                        ||
296             sbp->sb_sectsize < XFS_MIN_SECTORSIZE                       ||
297             sbp->sb_sectsize > XFS_MAX_SECTORSIZE                       ||
298             sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG                    ||
299             sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG                    ||
300             sbp->sb_sectsize != (1 << sbp->sb_sectlog)                  ||
301             sbp->sb_blocksize < XFS_MIN_BLOCKSIZE                       ||
302             sbp->sb_blocksize > XFS_MAX_BLOCKSIZE                       ||
303             sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG                    ||
304             sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG                    ||
305             sbp->sb_blocksize != (1 << sbp->sb_blocklog)                ||
306             sbp->sb_dirblklog + sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG ||
307             sbp->sb_inodesize < XFS_DINODE_MIN_SIZE                     ||
308             sbp->sb_inodesize > XFS_DINODE_MAX_SIZE                     ||
309             sbp->sb_inodelog < XFS_DINODE_MIN_LOG                       ||
310             sbp->sb_inodelog > XFS_DINODE_MAX_LOG                       ||
311             sbp->sb_inodesize != (1 << sbp->sb_inodelog)                ||
312             sbp->sb_logsunit > XLOG_MAX_RECORD_BSIZE                    ||
313             sbp->sb_inopblock != howmany(sbp->sb_blocksize,sbp->sb_inodesize) ||
314             XFS_FSB_TO_B(mp, sbp->sb_agblocks) < XFS_MIN_AG_BYTES       ||
315             XFS_FSB_TO_B(mp, sbp->sb_agblocks) > XFS_MAX_AG_BYTES       ||
316             sbp->sb_agblklog != xfs_highbit32(sbp->sb_agblocks - 1) + 1 ||
317             agcount == 0 || agcount != sbp->sb_agcount                  ||
318             (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog)   ||
319             (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE)  ||
320             (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE)  ||
321             (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */)    ||
322             sbp->sb_dblocks == 0                                        ||
323             sbp->sb_dblocks > XFS_MAX_DBLOCKS(sbp)                      ||
324             sbp->sb_dblocks < XFS_MIN_DBLOCKS(sbp)                      ||
325             sbp->sb_shared_vn != 0)) {
326                 xfs_notice(mp, "SB sanity check failed");
327                 return -EFSCORRUPTED;
328         }
329 
330         if (sbp->sb_unit) {
331                 if (!xfs_sb_version_hasdalign(sbp) ||
332                     sbp->sb_unit > sbp->sb_width ||
333                     (sbp->sb_width % sbp->sb_unit) != 0) {
334                         xfs_notice(mp, "SB stripe unit sanity check failed");
335                         return -EFSCORRUPTED;
336                 }
337         } else if (xfs_sb_version_hasdalign(sbp)) {
338                 xfs_notice(mp, "SB stripe alignment sanity check failed");
339                 return -EFSCORRUPTED;
340         } else if (sbp->sb_width) {
341                 xfs_notice(mp, "SB stripe width sanity check failed");
342                 return -EFSCORRUPTED;
343         }
344 
345 
346         if (xfs_sb_version_hascrc(&mp->m_sb) &&
347             sbp->sb_blocksize < XFS_MIN_CRC_BLOCKSIZE) {
348                 xfs_notice(mp, "v5 SB sanity check failed");
349                 return -EFSCORRUPTED;
350         }
351 
352         /*
353          * Until this is fixed only page-sized or smaller data blocks work.
354          */
355         if (unlikely(sbp->sb_blocksize > PAGE_SIZE)) {
356                 xfs_warn(mp,
357                 "File system with blocksize %d bytes. "
358                 "Only pagesize (%ld) or less will currently work.",
359                                 sbp->sb_blocksize, PAGE_SIZE);
360                 return -ENOSYS;
361         }
362 
363         /*
364          * Currently only very few inode sizes are supported.
365          */
366         switch (sbp->sb_inodesize) {
367         case 256:
368         case 512:
369         case 1024:
370         case 2048:
371                 break;
372         default:
373                 xfs_warn(mp, "inode size of %d bytes not supported",
374                                 sbp->sb_inodesize);
375                 return -ENOSYS;
376         }
377 
378         if (xfs_sb_validate_fsb_count(sbp, sbp->sb_dblocks) ||
379             xfs_sb_validate_fsb_count(sbp, sbp->sb_rblocks)) {
380                 xfs_warn(mp,
381                 "file system too large to be mounted on this system.");
382                 return -EFBIG;
383         }
384 
385         /*
386          * Don't touch the filesystem if a user tool thinks it owns the primary
387          * superblock.  mkfs doesn't clear the flag from secondary supers, so
388          * we don't check them at all.
389          */
390         if (XFS_BUF_ADDR(bp) == XFS_SB_DADDR && sbp->sb_inprogress) {
391                 xfs_warn(mp, "Offline file system operation in progress!");
392                 return -EFSCORRUPTED;
393         }
394         return 0;
395 }
396 
397 void
398 xfs_sb_quota_from_disk(struct xfs_sb *sbp)
399 {
400         /*
401          * older mkfs doesn't initialize quota inodes to NULLFSINO. This
402          * leads to in-core values having two different values for a quota
403          * inode to be invalid: 0 and NULLFSINO. Change it to a single value
404          * NULLFSINO.
405          *
406          * Note that this change affect only the in-core values. These
407          * values are not written back to disk unless any quota information
408          * is written to the disk. Even in that case, sb_pquotino field is
409          * not written to disk unless the superblock supports pquotino.
410          */
411         if (sbp->sb_uquotino == 0)
412                 sbp->sb_uquotino = NULLFSINO;
413         if (sbp->sb_gquotino == 0)
414                 sbp->sb_gquotino = NULLFSINO;
415         if (sbp->sb_pquotino == 0)
416                 sbp->sb_pquotino = NULLFSINO;
417 
418         /*
419          * We need to do these manipilations only if we are working
420          * with an older version of on-disk superblock.
421          */
422         if (xfs_sb_version_has_pquotino(sbp))
423                 return;
424 
425         if (sbp->sb_qflags & XFS_OQUOTA_ENFD)
426                 sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ?
427                                         XFS_PQUOTA_ENFD : XFS_GQUOTA_ENFD;
428         if (sbp->sb_qflags & XFS_OQUOTA_CHKD)
429                 sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ?
430                                         XFS_PQUOTA_CHKD : XFS_GQUOTA_CHKD;
431         sbp->sb_qflags &= ~(XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD);
432 
433         if (sbp->sb_qflags & XFS_PQUOTA_ACCT &&
434             sbp->sb_gquotino != NULLFSINO)  {
435                 /*
436                  * In older version of superblock, on-disk superblock only
437                  * has sb_gquotino, and in-core superblock has both sb_gquotino
438                  * and sb_pquotino. But, only one of them is supported at any
439                  * point of time. So, if PQUOTA is set in disk superblock,
440                  * copy over sb_gquotino to sb_pquotino.  The NULLFSINO test
441                  * above is to make sure we don't do this twice and wipe them
442                  * both out!
443                  */
444                 sbp->sb_pquotino = sbp->sb_gquotino;
445                 sbp->sb_gquotino = NULLFSINO;
446         }
447 }
448 
449 static void
450 __xfs_sb_from_disk(
451         struct xfs_sb   *to,
452         xfs_dsb_t       *from,
453         bool            convert_xquota)
454 {
455         to->sb_magicnum = be32_to_cpu(from->sb_magicnum);
456         to->sb_blocksize = be32_to_cpu(from->sb_blocksize);
457         to->sb_dblocks = be64_to_cpu(from->sb_dblocks);
458         to->sb_rblocks = be64_to_cpu(from->sb_rblocks);
459         to->sb_rextents = be64_to_cpu(from->sb_rextents);
460         memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid));
461         to->sb_logstart = be64_to_cpu(from->sb_logstart);
462         to->sb_rootino = be64_to_cpu(from->sb_rootino);
463         to->sb_rbmino = be64_to_cpu(from->sb_rbmino);
464         to->sb_rsumino = be64_to_cpu(from->sb_rsumino);
465         to->sb_rextsize = be32_to_cpu(from->sb_rextsize);
466         to->sb_agblocks = be32_to_cpu(from->sb_agblocks);
467         to->sb_agcount = be32_to_cpu(from->sb_agcount);
468         to->sb_rbmblocks = be32_to_cpu(from->sb_rbmblocks);
469         to->sb_logblocks = be32_to_cpu(from->sb_logblocks);
470         to->sb_versionnum = be16_to_cpu(from->sb_versionnum);
471         to->sb_sectsize = be16_to_cpu(from->sb_sectsize);
472         to->sb_inodesize = be16_to_cpu(from->sb_inodesize);
473         to->sb_inopblock = be16_to_cpu(from->sb_inopblock);
474         memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname));
475         to->sb_blocklog = from->sb_blocklog;
476         to->sb_sectlog = from->sb_sectlog;
477         to->sb_inodelog = from->sb_inodelog;
478         to->sb_inopblog = from->sb_inopblog;
479         to->sb_agblklog = from->sb_agblklog;
480         to->sb_rextslog = from->sb_rextslog;
481         to->sb_inprogress = from->sb_inprogress;
482         to->sb_imax_pct = from->sb_imax_pct;
483         to->sb_icount = be64_to_cpu(from->sb_icount);
484         to->sb_ifree = be64_to_cpu(from->sb_ifree);
485         to->sb_fdblocks = be64_to_cpu(from->sb_fdblocks);
486         to->sb_frextents = be64_to_cpu(from->sb_frextents);
487         to->sb_uquotino = be64_to_cpu(from->sb_uquotino);
488         to->sb_gquotino = be64_to_cpu(from->sb_gquotino);
489         to->sb_qflags = be16_to_cpu(from->sb_qflags);
490         to->sb_flags = from->sb_flags;
491         to->sb_shared_vn = from->sb_shared_vn;
492         to->sb_inoalignmt = be32_to_cpu(from->sb_inoalignmt);
493         to->sb_unit = be32_to_cpu(from->sb_unit);
494         to->sb_width = be32_to_cpu(from->sb_width);
495         to->sb_dirblklog = from->sb_dirblklog;
496         to->sb_logsectlog = from->sb_logsectlog;
497         to->sb_logsectsize = be16_to_cpu(from->sb_logsectsize);
498         to->sb_logsunit = be32_to_cpu(from->sb_logsunit);
499         to->sb_features2 = be32_to_cpu(from->sb_features2);
500         to->sb_bad_features2 = be32_to_cpu(from->sb_bad_features2);
501         to->sb_features_compat = be32_to_cpu(from->sb_features_compat);
502         to->sb_features_ro_compat = be32_to_cpu(from->sb_features_ro_compat);
503         to->sb_features_incompat = be32_to_cpu(from->sb_features_incompat);
504         to->sb_features_log_incompat =
505                                 be32_to_cpu(from->sb_features_log_incompat);
506         /* crc is only used on disk, not in memory; just init to 0 here. */
507         to->sb_crc = 0;
508         to->sb_spino_align = be32_to_cpu(from->sb_spino_align);
509         to->sb_pquotino = be64_to_cpu(from->sb_pquotino);
510         to->sb_lsn = be64_to_cpu(from->sb_lsn);
511         /*
512          * sb_meta_uuid is only on disk if it differs from sb_uuid and the
513          * feature flag is set; if not set we keep it only in memory.
514          */
515         if (xfs_sb_version_hasmetauuid(to))
516                 uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid);
517         else
518                 uuid_copy(&to->sb_meta_uuid, &from->sb_uuid);
519         /* Convert on-disk flags to in-memory flags? */
520         if (convert_xquota)
521                 xfs_sb_quota_from_disk(to);
522 }
523 
524 void
525 xfs_sb_from_disk(
526         struct xfs_sb   *to,
527         xfs_dsb_t       *from)
528 {
529         __xfs_sb_from_disk(to, from, true);
530 }
531 
532 static void
533 xfs_sb_quota_to_disk(
534         struct xfs_dsb  *to,
535         struct xfs_sb   *from)
536 {
537         uint16_t        qflags = from->sb_qflags;
538 
539         to->sb_uquotino = cpu_to_be64(from->sb_uquotino);
540         if (xfs_sb_version_has_pquotino(from)) {
541                 to->sb_qflags = cpu_to_be16(from->sb_qflags);
542                 to->sb_gquotino = cpu_to_be64(from->sb_gquotino);
543                 to->sb_pquotino = cpu_to_be64(from->sb_pquotino);
544                 return;
545         }
546 
547         /*
548          * The in-core version of sb_qflags do not have XFS_OQUOTA_*
549          * flags, whereas the on-disk version does.  So, convert incore
550          * XFS_{PG}QUOTA_* flags to on-disk XFS_OQUOTA_* flags.
551          */
552         qflags &= ~(XFS_PQUOTA_ENFD | XFS_PQUOTA_CHKD |
553                         XFS_GQUOTA_ENFD | XFS_GQUOTA_CHKD);
554 
555         if (from->sb_qflags &
556                         (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD))
557                 qflags |= XFS_OQUOTA_ENFD;
558         if (from->sb_qflags &
559                         (XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD))
560                 qflags |= XFS_OQUOTA_CHKD;
561         to->sb_qflags = cpu_to_be16(qflags);
562 
563         /*
564          * GQUOTINO and PQUOTINO cannot be used together in versions
565          * of superblock that do not have pquotino. from->sb_flags
566          * tells us which quota is active and should be copied to
567          * disk. If neither are active, we should NULL the inode.
568          *
569          * In all cases, the separate pquotino must remain 0 because it
570          * it beyond the "end" of the valid non-pquotino superblock.
571          */
572         if (from->sb_qflags & XFS_GQUOTA_ACCT)
573                 to->sb_gquotino = cpu_to_be64(from->sb_gquotino);
574         else if (from->sb_qflags & XFS_PQUOTA_ACCT)
575                 to->sb_gquotino = cpu_to_be64(from->sb_pquotino);
576         else {
577                 /*
578                  * We can't rely on just the fields being logged to tell us
579                  * that it is safe to write NULLFSINO - we should only do that
580                  * if quotas are not actually enabled. Hence only write
581                  * NULLFSINO if both in-core quota inodes are NULL.
582                  */
583                 if (from->sb_gquotino == NULLFSINO &&
584                     from->sb_pquotino == NULLFSINO)
585                         to->sb_gquotino = cpu_to_be64(NULLFSINO);
586         }
587 
588         to->sb_pquotino = 0;
589 }
590 
591 void
592 xfs_sb_to_disk(
593         struct xfs_dsb  *to,
594         struct xfs_sb   *from)
595 {
596         xfs_sb_quota_to_disk(to, from);
597 
598         to->sb_magicnum = cpu_to_be32(from->sb_magicnum);
599         to->sb_blocksize = cpu_to_be32(from->sb_blocksize);
600         to->sb_dblocks = cpu_to_be64(from->sb_dblocks);
601         to->sb_rblocks = cpu_to_be64(from->sb_rblocks);
602         to->sb_rextents = cpu_to_be64(from->sb_rextents);
603         memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid));
604         to->sb_logstart = cpu_to_be64(from->sb_logstart);
605         to->sb_rootino = cpu_to_be64(from->sb_rootino);
606         to->sb_rbmino = cpu_to_be64(from->sb_rbmino);
607         to->sb_rsumino = cpu_to_be64(from->sb_rsumino);
608         to->sb_rextsize = cpu_to_be32(from->sb_rextsize);
609         to->sb_agblocks = cpu_to_be32(from->sb_agblocks);
610         to->sb_agcount = cpu_to_be32(from->sb_agcount);
611         to->sb_rbmblocks = cpu_to_be32(from->sb_rbmblocks);
612         to->sb_logblocks = cpu_to_be32(from->sb_logblocks);
613         to->sb_versionnum = cpu_to_be16(from->sb_versionnum);
614         to->sb_sectsize = cpu_to_be16(from->sb_sectsize);
615         to->sb_inodesize = cpu_to_be16(from->sb_inodesize);
616         to->sb_inopblock = cpu_to_be16(from->sb_inopblock);
617         memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname));
618         to->sb_blocklog = from->sb_blocklog;
619         to->sb_sectlog = from->sb_sectlog;
620         to->sb_inodelog = from->sb_inodelog;
621         to->sb_inopblog = from->sb_inopblog;
622         to->sb_agblklog = from->sb_agblklog;
623         to->sb_rextslog = from->sb_rextslog;
624         to->sb_inprogress = from->sb_inprogress;
625         to->sb_imax_pct = from->sb_imax_pct;
626         to->sb_icount = cpu_to_be64(from->sb_icount);
627         to->sb_ifree = cpu_to_be64(from->sb_ifree);
628         to->sb_fdblocks = cpu_to_be64(from->sb_fdblocks);
629         to->sb_frextents = cpu_to_be64(from->sb_frextents);
630 
631         to->sb_flags = from->sb_flags;
632         to->sb_shared_vn = from->sb_shared_vn;
633         to->sb_inoalignmt = cpu_to_be32(from->sb_inoalignmt);
634         to->sb_unit = cpu_to_be32(from->sb_unit);
635         to->sb_width = cpu_to_be32(from->sb_width);
636         to->sb_dirblklog = from->sb_dirblklog;
637         to->sb_logsectlog = from->sb_logsectlog;
638         to->sb_logsectsize = cpu_to_be16(from->sb_logsectsize);
639         to->sb_logsunit = cpu_to_be32(from->sb_logsunit);
640 
641         /*
642          * We need to ensure that bad_features2 always matches features2.
643          * Hence we enforce that here rather than having to remember to do it
644          * everywhere else that updates features2.
645          */
646         from->sb_bad_features2 = from->sb_features2;
647         to->sb_features2 = cpu_to_be32(from->sb_features2);
648         to->sb_bad_features2 = cpu_to_be32(from->sb_bad_features2);
649 
650         if (xfs_sb_version_hascrc(from)) {
651                 to->sb_features_compat = cpu_to_be32(from->sb_features_compat);
652                 to->sb_features_ro_compat =
653                                 cpu_to_be32(from->sb_features_ro_compat);
654                 to->sb_features_incompat =
655                                 cpu_to_be32(from->sb_features_incompat);
656                 to->sb_features_log_incompat =
657                                 cpu_to_be32(from->sb_features_log_incompat);
658                 to->sb_spino_align = cpu_to_be32(from->sb_spino_align);
659                 to->sb_lsn = cpu_to_be64(from->sb_lsn);
660                 if (xfs_sb_version_hasmetauuid(from))
661                         uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid);
662         }
663 }
664 
665 /*
666  * If the superblock has the CRC feature bit set or the CRC field is non-null,
667  * check that the CRC is valid.  We check the CRC field is non-null because a
668  * single bit error could clear the feature bit and unused parts of the
669  * superblock are supposed to be zero. Hence a non-null crc field indicates that
670  * we've potentially lost a feature bit and we should check it anyway.
671  *
672  * However, past bugs (i.e. in growfs) left non-zeroed regions beyond the
673  * last field in V4 secondary superblocks.  So for secondary superblocks,
674  * we are more forgiving, and ignore CRC failures if the primary doesn't
675  * indicate that the fs version is V5.
676  */
677 static void
678 xfs_sb_read_verify(
679         struct xfs_buf          *bp)
680 {
681         struct xfs_sb           sb;
682         struct xfs_mount        *mp = bp->b_mount;
683         struct xfs_dsb          *dsb = XFS_BUF_TO_SBP(bp);
684         int                     error;
685 
686         /*
687          * open code the version check to avoid needing to convert the entire
688          * superblock from disk order just to check the version number
689          */
690         if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC) &&
691             (((be16_to_cpu(dsb->sb_versionnum) & XFS_SB_VERSION_NUMBITS) ==
692                                                 XFS_SB_VERSION_5) ||
693              dsb->sb_crc != 0)) {
694 
695                 if (!xfs_buf_verify_cksum(bp, XFS_SB_CRC_OFF)) {
696                         /* Only fail bad secondaries on a known V5 filesystem */
697                         if (bp->b_bn == XFS_SB_DADDR ||
698                             xfs_sb_version_hascrc(&mp->m_sb)) {
699                                 error = -EFSBADCRC;
700                                 goto out_error;
701                         }
702                 }
703         }
704 
705         /*
706          * Check all the superblock fields.  Don't byteswap the xquota flags
707          * because _verify_common checks the on-disk values.
708          */
709         __xfs_sb_from_disk(&sb, XFS_BUF_TO_SBP(bp), false);
710         error = xfs_validate_sb_common(mp, bp, &sb);
711         if (error)
712                 goto out_error;
713         error = xfs_validate_sb_read(mp, &sb);
714 
715 out_error:
716         if (error == -EFSCORRUPTED || error == -EFSBADCRC)
717                 xfs_verifier_error(bp, error, __this_address);
718         else if (error)
719                 xfs_buf_ioerror(bp, error);
720 }
721 
722 /*
723  * We may be probed for a filesystem match, so we may not want to emit
724  * messages when the superblock buffer is not actually an XFS superblock.
725  * If we find an XFS superblock, then run a normal, noisy mount because we are
726  * really going to mount it and want to know about errors.
727  */
728 static void
729 xfs_sb_quiet_read_verify(
730         struct xfs_buf  *bp)
731 {
732         struct xfs_dsb  *dsb = XFS_BUF_TO_SBP(bp);
733 
734         if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC)) {
735                 /* XFS filesystem, verify noisily! */
736                 xfs_sb_read_verify(bp);
737                 return;
738         }
739         /* quietly fail */
740         xfs_buf_ioerror(bp, -EWRONGFS);
741 }
742 
743 static void
744 xfs_sb_write_verify(
745         struct xfs_buf          *bp)
746 {
747         struct xfs_sb           sb;
748         struct xfs_mount        *mp = bp->b_mount;
749         struct xfs_buf_log_item *bip = bp->b_log_item;
750         int                     error;
751 
752         /*
753          * Check all the superblock fields.  Don't byteswap the xquota flags
754          * because _verify_common checks the on-disk values.
755          */
756         __xfs_sb_from_disk(&sb, XFS_BUF_TO_SBP(bp), false);
757         error = xfs_validate_sb_common(mp, bp, &sb);
758         if (error)
759                 goto out_error;
760         error = xfs_validate_sb_write(mp, bp, &sb);
761         if (error)
762                 goto out_error;
763 
764         if (!xfs_sb_version_hascrc(&mp->m_sb))
765                 return;
766 
767         if (bip)
768                 XFS_BUF_TO_SBP(bp)->sb_lsn = cpu_to_be64(bip->bli_item.li_lsn);
769 
770         xfs_buf_update_cksum(bp, XFS_SB_CRC_OFF);
771         return;
772 
773 out_error:
774         xfs_verifier_error(bp, error, __this_address);
775 }
776 
777 const struct xfs_buf_ops xfs_sb_buf_ops = {
778         .name = "xfs_sb",
779         .magic = { cpu_to_be32(XFS_SB_MAGIC), cpu_to_be32(XFS_SB_MAGIC) },
780         .verify_read = xfs_sb_read_verify,
781         .verify_write = xfs_sb_write_verify,
782 };
783 
784 const struct xfs_buf_ops xfs_sb_quiet_buf_ops = {
785         .name = "xfs_sb_quiet",
786         .magic = { cpu_to_be32(XFS_SB_MAGIC), cpu_to_be32(XFS_SB_MAGIC) },
787         .verify_read = xfs_sb_quiet_read_verify,
788         .verify_write = xfs_sb_write_verify,
789 };
790 
791 /*
792  * xfs_mount_common
793  *
794  * Mount initialization code establishing various mount
795  * fields from the superblock associated with the given
796  * mount structure.
797  *
798  * Inode geometry are calculated in xfs_ialloc_setup_geometry.
799  */
800 void
801 xfs_sb_mount_common(
802         struct xfs_mount        *mp,
803         struct xfs_sb           *sbp)
804 {
805         mp->m_agfrotor = mp->m_agirotor = 0;
806         mp->m_maxagi = mp->m_sb.sb_agcount;
807         mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG;
808         mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT;
809         mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT;
810         mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1;
811         mp->m_blockmask = sbp->sb_blocksize - 1;
812         mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG;
813         mp->m_blockwmask = mp->m_blockwsize - 1;
814 
815         mp->m_alloc_mxr[0] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 1);
816         mp->m_alloc_mxr[1] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 0);
817         mp->m_alloc_mnr[0] = mp->m_alloc_mxr[0] / 2;
818         mp->m_alloc_mnr[1] = mp->m_alloc_mxr[1] / 2;
819 
820         mp->m_bmap_dmxr[0] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 1);
821         mp->m_bmap_dmxr[1] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 0);
822         mp->m_bmap_dmnr[0] = mp->m_bmap_dmxr[0] / 2;
823         mp->m_bmap_dmnr[1] = mp->m_bmap_dmxr[1] / 2;
824 
825         mp->m_rmap_mxr[0] = xfs_rmapbt_maxrecs(sbp->sb_blocksize, 1);
826         mp->m_rmap_mxr[1] = xfs_rmapbt_maxrecs(sbp->sb_blocksize, 0);
827         mp->m_rmap_mnr[0] = mp->m_rmap_mxr[0] / 2;
828         mp->m_rmap_mnr[1] = mp->m_rmap_mxr[1] / 2;
829 
830         mp->m_refc_mxr[0] = xfs_refcountbt_maxrecs(sbp->sb_blocksize, true);
831         mp->m_refc_mxr[1] = xfs_refcountbt_maxrecs(sbp->sb_blocksize, false);
832         mp->m_refc_mnr[0] = mp->m_refc_mxr[0] / 2;
833         mp->m_refc_mnr[1] = mp->m_refc_mxr[1] / 2;
834 
835         mp->m_bsize = XFS_FSB_TO_BB(mp, 1);
836         mp->m_alloc_set_aside = xfs_alloc_set_aside(mp);
837         mp->m_ag_max_usable = xfs_alloc_ag_max_usable(mp);
838 }
839 
840 /*
841  * xfs_initialize_perag_data
842  *
843  * Read in each per-ag structure so we can count up the number of
844  * allocated inodes, free inodes and used filesystem blocks as this
845  * information is no longer persistent in the superblock. Once we have
846  * this information, write it into the in-core superblock structure.
847  */
848 int
849 xfs_initialize_perag_data(
850         struct xfs_mount *mp,
851         xfs_agnumber_t  agcount)
852 {
853         xfs_agnumber_t  index;
854         xfs_perag_t     *pag;
855         xfs_sb_t        *sbp = &mp->m_sb;
856         uint64_t        ifree = 0;
857         uint64_t        ialloc = 0;
858         uint64_t        bfree = 0;
859         uint64_t        bfreelst = 0;
860         uint64_t        btree = 0;
861         uint64_t        fdblocks;
862         int             error = 0;
863 
864         for (index = 0; index < agcount; index++) {
865                 /*
866                  * read the agf, then the agi. This gets us
867                  * all the information we need and populates the
868                  * per-ag structures for us.
869                  */
870                 error = xfs_alloc_pagf_init(mp, NULL, index, 0);
871                 if (error)
872                         return error;
873 
874                 error = xfs_ialloc_pagi_init(mp, NULL, index);
875                 if (error)
876                         return error;
877                 pag = xfs_perag_get(mp, index);
878                 ifree += pag->pagi_freecount;
879                 ialloc += pag->pagi_count;
880                 bfree += pag->pagf_freeblks;
881                 bfreelst += pag->pagf_flcount;
882                 btree += pag->pagf_btreeblks;
883                 xfs_perag_put(pag);
884         }
885         fdblocks = bfree + bfreelst + btree;
886 
887         /*
888          * If the new summary counts are obviously incorrect, fail the
889          * mount operation because that implies the AGFs are also corrupt.
890          * Clear FS_COUNTERS so that we don't unmount with a dirty log, which
891          * will prevent xfs_repair from fixing anything.
892          */
893         if (fdblocks > sbp->sb_dblocks || ifree > ialloc) {
894                 xfs_alert(mp, "AGF corruption. Please run xfs_repair.");
895                 error = -EFSCORRUPTED;
896                 goto out;
897         }
898 
899         /* Overwrite incore superblock counters with just-read data */
900         spin_lock(&mp->m_sb_lock);
901         sbp->sb_ifree = ifree;
902         sbp->sb_icount = ialloc;
903         sbp->sb_fdblocks = fdblocks;
904         spin_unlock(&mp->m_sb_lock);
905 
906         xfs_reinit_percpu_counters(mp);
907 out:
908         xfs_fs_mark_healthy(mp, XFS_SICK_FS_COUNTERS);
909         return error;
910 }
911 
912 /*
913  * xfs_log_sb() can be used to copy arbitrary changes to the in-core superblock
914  * into the superblock buffer to be logged.  It does not provide the higher
915  * level of locking that is needed to protect the in-core superblock from
916  * concurrent access.
917  */
918 void
919 xfs_log_sb(
920         struct xfs_trans        *tp)
921 {
922         struct xfs_mount        *mp = tp->t_mountp;
923         struct xfs_buf          *bp = xfs_trans_getsb(tp, mp);
924 
925         mp->m_sb.sb_icount = percpu_counter_sum(&mp->m_icount);
926         mp->m_sb.sb_ifree = percpu_counter_sum(&mp->m_ifree);
927         mp->m_sb.sb_fdblocks = percpu_counter_sum(&mp->m_fdblocks);
928 
929         xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb);
930         xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF);
931         xfs_trans_log_buf(tp, bp, 0, sizeof(struct xfs_dsb));
932 }
933 
934 /*
935  * xfs_sync_sb
936  *
937  * Sync the superblock to disk.
938  *
939  * Note that the caller is responsible for checking the frozen state of the
940  * filesystem. This procedure uses the non-blocking transaction allocator and
941  * thus will allow modifications to a frozen fs. This is required because this
942  * code can be called during the process of freezing where use of the high-level
943  * allocator would deadlock.
944  */
945 int
946 xfs_sync_sb(
947         struct xfs_mount        *mp,
948         bool                    wait)
949 {
950         struct xfs_trans        *tp;
951         int                     error;
952 
953         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_sb, 0, 0,
954                         XFS_TRANS_NO_WRITECOUNT, &tp);
955         if (error)
956                 return error;
957 
958         xfs_log_sb(tp);
959         if (wait)
960                 xfs_trans_set_sync(tp);
961         return xfs_trans_commit(tp);
962 }
963 
964 /*
965  * Update all the secondary superblocks to match the new state of the primary.
966  * Because we are completely overwriting all the existing fields in the
967  * secondary superblock buffers, there is no need to read them in from disk.
968  * Just get a new buffer, stamp it and write it.
969  *
970  * The sb buffers need to be cached here so that we serialise against other
971  * operations that access the secondary superblocks, but we don't want to keep
972  * them in memory once it is written so we mark it as a one-shot buffer.
973  */
974 int
975 xfs_update_secondary_sbs(
976         struct xfs_mount        *mp)
977 {
978         xfs_agnumber_t          agno;
979         int                     saved_error = 0;
980         int                     error = 0;
981         LIST_HEAD               (buffer_list);
982 
983         /* update secondary superblocks. */
984         for (agno = 1; agno < mp->m_sb.sb_agcount; agno++) {
985                 struct xfs_buf          *bp;
986 
987                 bp = xfs_buf_get(mp->m_ddev_targp,
988                                  XFS_AG_DADDR(mp, agno, XFS_SB_DADDR),
989                                  XFS_FSS_TO_BB(mp, 1));
990                 /*
991                  * If we get an error reading or writing alternate superblocks,
992                  * continue.  xfs_repair chooses the "best" superblock based
993                  * on most matches; if we break early, we'll leave more
994                  * superblocks un-updated than updated, and xfs_repair may
995                  * pick them over the properly-updated primary.
996                  */
997                 if (!bp) {
998                         xfs_warn(mp,
999                 "error allocating secondary superblock for ag %d",
1000                                 agno);
1001                         if (!saved_error)
1002                                 saved_error = -ENOMEM;
1003                         continue;
1004                 }
1005 
1006                 bp->b_ops = &xfs_sb_buf_ops;
1007                 xfs_buf_oneshot(bp);
1008                 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
1009                 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb);
1010                 xfs_buf_delwri_queue(bp, &buffer_list);
1011                 xfs_buf_relse(bp);
1012 
1013                 /* don't hold too many buffers at once */
1014                 if (agno % 16)
1015                         continue;
1016 
1017                 error = xfs_buf_delwri_submit(&buffer_list);
1018                 if (error) {
1019                         xfs_warn(mp,
1020                 "write error %d updating a secondary superblock near ag %d",
1021                                 error, agno);
1022                         if (!saved_error)
1023                                 saved_error = error;
1024                         continue;
1025                 }
1026         }
1027         error = xfs_buf_delwri_submit(&buffer_list);
1028         if (error) {
1029                 xfs_warn(mp,
1030                 "write error %d updating a secondary superblock near ag %d",
1031                         error, agno);
1032         }
1033 
1034         return saved_error ? saved_error : error;
1035 }
1036 
1037 /*
1038  * Same behavior as xfs_sync_sb, except that it is always synchronous and it
1039  * also writes the superblock buffer to disk sector 0 immediately.
1040  */
1041 int
1042 xfs_sync_sb_buf(
1043         struct xfs_mount        *mp)
1044 {
1045         struct xfs_trans        *tp;
1046         struct xfs_buf          *bp;
1047         int                     error;
1048 
1049         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_sb, 0, 0, 0, &tp);
1050         if (error)
1051                 return error;
1052 
1053         bp = xfs_trans_getsb(tp, mp);
1054         xfs_log_sb(tp);
1055         xfs_trans_bhold(tp, bp);
1056         xfs_trans_set_sync(tp);
1057         error = xfs_trans_commit(tp);
1058         if (error)
1059                 goto out;
1060         /*
1061          * write out the sb buffer to get the changes to disk
1062          */
1063         error = xfs_bwrite(bp);
1064 out:
1065         xfs_buf_relse(bp);
1066         return error;
1067 }
1068 
1069 void
1070 xfs_fs_geometry(
1071         struct xfs_sb           *sbp,
1072         struct xfs_fsop_geom    *geo,
1073         int                     struct_version)
1074 {
1075         memset(geo, 0, sizeof(struct xfs_fsop_geom));
1076 
1077         geo->blocksize = sbp->sb_blocksize;
1078         geo->rtextsize = sbp->sb_rextsize;
1079         geo->agblocks = sbp->sb_agblocks;
1080         geo->agcount = sbp->sb_agcount;
1081         geo->logblocks = sbp->sb_logblocks;
1082         geo->sectsize = sbp->sb_sectsize;
1083         geo->inodesize = sbp->sb_inodesize;
1084         geo->imaxpct = sbp->sb_imax_pct;
1085         geo->datablocks = sbp->sb_dblocks;
1086         geo->rtblocks = sbp->sb_rblocks;
1087         geo->rtextents = sbp->sb_rextents;
1088         geo->logstart = sbp->sb_logstart;
1089         BUILD_BUG_ON(sizeof(geo->uuid) != sizeof(sbp->sb_uuid));
1090         memcpy(geo->uuid, &sbp->sb_uuid, sizeof(sbp->sb_uuid));
1091 
1092         if (struct_version < 2)
1093                 return;
1094 
1095         geo->sunit = sbp->sb_unit;
1096         geo->swidth = sbp->sb_width;
1097 
1098         if (struct_version < 3)
1099                 return;
1100 
1101         geo->version = XFS_FSOP_GEOM_VERSION;
1102         geo->flags = XFS_FSOP_GEOM_FLAGS_NLINK |
1103                      XFS_FSOP_GEOM_FLAGS_DIRV2 |
1104                      XFS_FSOP_GEOM_FLAGS_EXTFLG;
1105         if (xfs_sb_version_hasattr(sbp))
1106                 geo->flags |= XFS_FSOP_GEOM_FLAGS_ATTR;
1107         if (xfs_sb_version_hasquota(sbp))
1108                 geo->flags |= XFS_FSOP_GEOM_FLAGS_QUOTA;
1109         if (xfs_sb_version_hasalign(sbp))
1110                 geo->flags |= XFS_FSOP_GEOM_FLAGS_IALIGN;
1111         if (xfs_sb_version_hasdalign(sbp))
1112                 geo->flags |= XFS_FSOP_GEOM_FLAGS_DALIGN;
1113         if (xfs_sb_version_hassector(sbp))
1114                 geo->flags |= XFS_FSOP_GEOM_FLAGS_SECTOR;
1115         if (xfs_sb_version_hasasciici(sbp))
1116                 geo->flags |= XFS_FSOP_GEOM_FLAGS_DIRV2CI;
1117         if (xfs_sb_version_haslazysbcount(sbp))
1118                 geo->flags |= XFS_FSOP_GEOM_FLAGS_LAZYSB;
1119         if (xfs_sb_version_hasattr2(sbp))
1120                 geo->flags |= XFS_FSOP_GEOM_FLAGS_ATTR2;
1121         if (xfs_sb_version_hasprojid32bit(sbp))
1122                 geo->flags |= XFS_FSOP_GEOM_FLAGS_PROJID32;
1123         if (xfs_sb_version_hascrc(sbp))
1124                 geo->flags |= XFS_FSOP_GEOM_FLAGS_V5SB;
1125         if (xfs_sb_version_hasftype(sbp))
1126                 geo->flags |= XFS_FSOP_GEOM_FLAGS_FTYPE;
1127         if (xfs_sb_version_hasfinobt(sbp))
1128                 geo->flags |= XFS_FSOP_GEOM_FLAGS_FINOBT;
1129         if (xfs_sb_version_hassparseinodes(sbp))
1130                 geo->flags |= XFS_FSOP_GEOM_FLAGS_SPINODES;
1131         if (xfs_sb_version_hasrmapbt(sbp))
1132                 geo->flags |= XFS_FSOP_GEOM_FLAGS_RMAPBT;
1133         if (xfs_sb_version_hasreflink(sbp))
1134                 geo->flags |= XFS_FSOP_GEOM_FLAGS_REFLINK;
1135         if (xfs_sb_version_hassector(sbp))
1136                 geo->logsectsize = sbp->sb_logsectsize;
1137         else
1138                 geo->logsectsize = BBSIZE;
1139         geo->rtsectsize = sbp->sb_blocksize;
1140         geo->dirblocksize = xfs_dir2_dirblock_bytes(sbp);
1141 
1142         if (struct_version < 4)
1143                 return;
1144 
1145         if (xfs_sb_version_haslogv2(sbp))
1146                 geo->flags |= XFS_FSOP_GEOM_FLAGS_LOGV2;
1147 
1148         geo->logsunit = sbp->sb_logsunit;
1149 
1150         if (struct_version < 5)
1151                 return;
1152 
1153         geo->version = XFS_FSOP_GEOM_VERSION_V5;
1154 }
1155 
1156 /* Read a secondary superblock. */
1157 int
1158 xfs_sb_read_secondary(
1159         struct xfs_mount        *mp,
1160         struct xfs_trans        *tp,
1161         xfs_agnumber_t          agno,
1162         struct xfs_buf          **bpp)
1163 {
1164         struct xfs_buf          *bp;
1165         int                     error;
1166 
1167         ASSERT(agno != 0 && agno != NULLAGNUMBER);
1168         error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
1169                         XFS_AG_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
1170                         XFS_FSS_TO_BB(mp, 1), 0, &bp, &xfs_sb_buf_ops);
1171         if (error)
1172                 return error;
1173         xfs_buf_set_ref(bp, XFS_SSB_REF);
1174         *bpp = bp;
1175         return 0;
1176 }
1177 
1178 /* Get an uninitialised secondary superblock buffer. */
1179 int
1180 xfs_sb_get_secondary(
1181         struct xfs_mount        *mp,
1182         struct xfs_trans        *tp,
1183         xfs_agnumber_t          agno,
1184         struct xfs_buf          **bpp)
1185 {
1186         struct xfs_buf          *bp;
1187 
1188         ASSERT(agno != 0 && agno != NULLAGNUMBER);
1189         bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
1190                         XFS_AG_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
1191                         XFS_FSS_TO_BB(mp, 1), 0);
1192         if (!bp)
1193                 return -ENOMEM;
1194         bp->b_ops = &xfs_sb_buf_ops;
1195         xfs_buf_oneshot(bp);
1196         *bpp = bp;
1197         return 0;
1198 }
1199 

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