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ff55068c DC |
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" | |
632b89e8 | 20 | #include "xfs_shared.h" |
ff55068c | 21 | #include "xfs_format.h" |
239880ef DC |
22 | #include "xfs_log_format.h" |
23 | #include "xfs_trans_resv.h" | |
ff55068c | 24 | #include "xfs_bit.h" |
ff55068c DC |
25 | #include "xfs_sb.h" |
26 | #include "xfs_ag.h" | |
27 | #include "xfs_mount.h" | |
ff55068c | 28 | #include "xfs_inode.h" |
ff55068c DC |
29 | #include "xfs_ialloc.h" |
30 | #include "xfs_alloc.h" | |
ff55068c | 31 | #include "xfs_error.h" |
ff55068c DC |
32 | #include "xfs_trace.h" |
33 | #include "xfs_cksum.h" | |
239880ef | 34 | #include "xfs_trans.h" |
ff55068c | 35 | #include "xfs_buf_item.h" |
a4fbe6ab DC |
36 | #include "xfs_dinode.h" |
37 | #include "xfs_bmap_btree.h" | |
38 | #include "xfs_alloc_btree.h" | |
39 | #include "xfs_ialloc_btree.h" | |
ff55068c DC |
40 | |
41 | /* | |
42 | * Physical superblock buffer manipulations. Shared with libxfs in userspace. | |
43 | */ | |
44 | ||
45 | static 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 | */ | |
113 | struct xfs_perag * | |
114 | xfs_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 | */ | |
135 | struct xfs_perag * | |
136 | xfs_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 | ||
158 | void | |
159 | xfs_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 | */ | |
172 | STATIC int | |
173 | xfs_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 | xfs_alert(mp, | |
205 | "Version 5 superblock detected. This kernel has EXPERIMENTAL support enabled!\n" | |
206 | "Use of these features in this kernel is at your own risk!"); | |
207 | ||
208 | if (xfs_sb_has_compat_feature(sbp, | |
209 | XFS_SB_FEAT_COMPAT_UNKNOWN)) { | |
210 | xfs_warn(mp, | |
211 | "Superblock has unknown compatible features (0x%x) enabled.\n" | |
212 | "Using a more recent kernel is recommended.", | |
213 | (sbp->sb_features_compat & | |
214 | XFS_SB_FEAT_COMPAT_UNKNOWN)); | |
215 | } | |
216 | ||
217 | if (xfs_sb_has_ro_compat_feature(sbp, | |
218 | XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) { | |
219 | xfs_alert(mp, | |
220 | "Superblock has unknown read-only compatible features (0x%x) enabled.", | |
221 | (sbp->sb_features_ro_compat & | |
222 | XFS_SB_FEAT_RO_COMPAT_UNKNOWN)); | |
223 | if (!(mp->m_flags & XFS_MOUNT_RDONLY)) { | |
224 | xfs_warn(mp, | |
225 | "Attempted to mount read-only compatible filesystem read-write.\n" | |
226 | "Filesystem can only be safely mounted read only."); | |
227 | return XFS_ERROR(EINVAL); | |
228 | } | |
229 | } | |
230 | if (xfs_sb_has_incompat_feature(sbp, | |
231 | XFS_SB_FEAT_INCOMPAT_UNKNOWN)) { | |
232 | xfs_warn(mp, | |
233 | "Superblock has unknown incompatible features (0x%x) enabled.\n" | |
234 | "Filesystem can not be safely mounted by this kernel.", | |
235 | (sbp->sb_features_incompat & | |
236 | XFS_SB_FEAT_INCOMPAT_UNKNOWN)); | |
237 | return XFS_ERROR(EINVAL); | |
238 | } | |
239 | } | |
240 | ||
241 | if (xfs_sb_version_has_pquotino(sbp)) { | |
242 | if (sbp->sb_qflags & (XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD)) { | |
243 | xfs_notice(mp, | |
08e96e1a | 244 | "Version 5 of Super block has XFS_OQUOTA bits."); |
ff55068c DC |
245 | return XFS_ERROR(EFSCORRUPTED); |
246 | } | |
247 | } else if (sbp->sb_qflags & (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD | | |
248 | XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD)) { | |
249 | xfs_notice(mp, | |
08e96e1a | 250 | "Superblock earlier than Version 5 has XFS_[PQ]UOTA_{ENFD|CHKD} bits."); |
ff55068c DC |
251 | return XFS_ERROR(EFSCORRUPTED); |
252 | } | |
253 | ||
254 | if (unlikely( | |
255 | sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) { | |
256 | xfs_warn(mp, | |
257 | "filesystem is marked as having an external log; " | |
258 | "specify logdev on the mount command line."); | |
259 | return XFS_ERROR(EINVAL); | |
260 | } | |
261 | ||
262 | if (unlikely( | |
263 | sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) { | |
264 | xfs_warn(mp, | |
265 | "filesystem is marked as having an internal log; " | |
266 | "do not specify logdev on the mount command line."); | |
267 | return XFS_ERROR(EINVAL); | |
268 | } | |
269 | ||
270 | /* | |
271 | * More sanity checking. Most of these were stolen directly from | |
272 | * xfs_repair. | |
273 | */ | |
274 | if (unlikely( | |
275 | sbp->sb_agcount <= 0 || | |
276 | sbp->sb_sectsize < XFS_MIN_SECTORSIZE || | |
277 | sbp->sb_sectsize > XFS_MAX_SECTORSIZE || | |
278 | sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG || | |
279 | sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG || | |
280 | sbp->sb_sectsize != (1 << sbp->sb_sectlog) || | |
281 | sbp->sb_blocksize < XFS_MIN_BLOCKSIZE || | |
282 | sbp->sb_blocksize > XFS_MAX_BLOCKSIZE || | |
283 | sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG || | |
284 | sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG || | |
285 | sbp->sb_blocksize != (1 << sbp->sb_blocklog) || | |
286 | sbp->sb_inodesize < XFS_DINODE_MIN_SIZE || | |
287 | sbp->sb_inodesize > XFS_DINODE_MAX_SIZE || | |
288 | sbp->sb_inodelog < XFS_DINODE_MIN_LOG || | |
289 | sbp->sb_inodelog > XFS_DINODE_MAX_LOG || | |
290 | sbp->sb_inodesize != (1 << sbp->sb_inodelog) || | |
392c6de9 | 291 | sbp->sb_inopblock != howmany(sbp->sb_blocksize,sbp->sb_inodesize) || |
ff55068c DC |
292 | (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) || |
293 | (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) || | |
294 | (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) || | |
295 | (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */) || | |
296 | sbp->sb_dblocks == 0 || | |
297 | sbp->sb_dblocks > XFS_MAX_DBLOCKS(sbp) || | |
298 | sbp->sb_dblocks < XFS_MIN_DBLOCKS(sbp))) { | |
5ef11eb0 | 299 | xfs_notice(mp, "SB sanity check failed"); |
ff55068c DC |
300 | return XFS_ERROR(EFSCORRUPTED); |
301 | } | |
302 | ||
303 | /* | |
304 | * Until this is fixed only page-sized or smaller data blocks work. | |
305 | */ | |
306 | if (unlikely(sbp->sb_blocksize > PAGE_SIZE)) { | |
307 | xfs_warn(mp, | |
308 | "File system with blocksize %d bytes. " | |
309 | "Only pagesize (%ld) or less will currently work.", | |
310 | sbp->sb_blocksize, PAGE_SIZE); | |
311 | return XFS_ERROR(ENOSYS); | |
312 | } | |
313 | ||
314 | /* | |
315 | * Currently only very few inode sizes are supported. | |
316 | */ | |
317 | switch (sbp->sb_inodesize) { | |
318 | case 256: | |
319 | case 512: | |
320 | case 1024: | |
321 | case 2048: | |
322 | break; | |
323 | default: | |
324 | xfs_warn(mp, "inode size of %d bytes not supported", | |
325 | sbp->sb_inodesize); | |
326 | return XFS_ERROR(ENOSYS); | |
327 | } | |
328 | ||
329 | if (xfs_sb_validate_fsb_count(sbp, sbp->sb_dblocks) || | |
330 | xfs_sb_validate_fsb_count(sbp, sbp->sb_rblocks)) { | |
331 | xfs_warn(mp, | |
332 | "file system too large to be mounted on this system."); | |
333 | return XFS_ERROR(EFBIG); | |
334 | } | |
335 | ||
336 | if (check_inprogress && sbp->sb_inprogress) { | |
337 | xfs_warn(mp, "Offline file system operation in progress!"); | |
338 | return XFS_ERROR(EFSCORRUPTED); | |
339 | } | |
340 | ||
341 | /* | |
342 | * Version 1 directory format has never worked on Linux. | |
343 | */ | |
344 | if (unlikely(!xfs_sb_version_hasdirv2(sbp))) { | |
345 | xfs_warn(mp, "file system using version 1 directory format"); | |
346 | return XFS_ERROR(ENOSYS); | |
347 | } | |
348 | ||
349 | return 0; | |
350 | } | |
351 | ||
352 | void | |
353 | xfs_sb_quota_from_disk(struct xfs_sb *sbp) | |
354 | { | |
355 | /* | |
356 | * older mkfs doesn't initialize quota inodes to NULLFSINO. This | |
357 | * leads to in-core values having two different values for a quota | |
358 | * inode to be invalid: 0 and NULLFSINO. Change it to a single value | |
359 | * NULLFSINO. | |
360 | * | |
361 | * Note that this change affect only the in-core values. These | |
362 | * values are not written back to disk unless any quota information | |
363 | * is written to the disk. Even in that case, sb_pquotino field is | |
364 | * not written to disk unless the superblock supports pquotino. | |
365 | */ | |
366 | if (sbp->sb_uquotino == 0) | |
367 | sbp->sb_uquotino = NULLFSINO; | |
368 | if (sbp->sb_gquotino == 0) | |
369 | sbp->sb_gquotino = NULLFSINO; | |
370 | if (sbp->sb_pquotino == 0) | |
371 | sbp->sb_pquotino = NULLFSINO; | |
372 | ||
373 | /* | |
374 | * We need to do these manipilations only if we are working | |
375 | * with an older version of on-disk superblock. | |
376 | */ | |
377 | if (xfs_sb_version_has_pquotino(sbp)) | |
378 | return; | |
379 | ||
380 | if (sbp->sb_qflags & XFS_OQUOTA_ENFD) | |
381 | sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ? | |
382 | XFS_PQUOTA_ENFD : XFS_GQUOTA_ENFD; | |
383 | if (sbp->sb_qflags & XFS_OQUOTA_CHKD) | |
384 | sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ? | |
385 | XFS_PQUOTA_CHKD : XFS_GQUOTA_CHKD; | |
386 | sbp->sb_qflags &= ~(XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD); | |
387 | ||
388 | if (sbp->sb_qflags & XFS_PQUOTA_ACCT) { | |
389 | /* | |
390 | * In older version of superblock, on-disk superblock only | |
391 | * has sb_gquotino, and in-core superblock has both sb_gquotino | |
392 | * and sb_pquotino. But, only one of them is supported at any | |
393 | * point of time. So, if PQUOTA is set in disk superblock, | |
394 | * copy over sb_gquotino to sb_pquotino. | |
395 | */ | |
396 | sbp->sb_pquotino = sbp->sb_gquotino; | |
397 | sbp->sb_gquotino = NULLFSINO; | |
398 | } | |
399 | } | |
400 | ||
401 | void | |
402 | xfs_sb_from_disk( | |
403 | struct xfs_sb *to, | |
404 | xfs_dsb_t *from) | |
405 | { | |
406 | to->sb_magicnum = be32_to_cpu(from->sb_magicnum); | |
407 | to->sb_blocksize = be32_to_cpu(from->sb_blocksize); | |
408 | to->sb_dblocks = be64_to_cpu(from->sb_dblocks); | |
409 | to->sb_rblocks = be64_to_cpu(from->sb_rblocks); | |
410 | to->sb_rextents = be64_to_cpu(from->sb_rextents); | |
411 | memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid)); | |
412 | to->sb_logstart = be64_to_cpu(from->sb_logstart); | |
413 | to->sb_rootino = be64_to_cpu(from->sb_rootino); | |
414 | to->sb_rbmino = be64_to_cpu(from->sb_rbmino); | |
415 | to->sb_rsumino = be64_to_cpu(from->sb_rsumino); | |
416 | to->sb_rextsize = be32_to_cpu(from->sb_rextsize); | |
417 | to->sb_agblocks = be32_to_cpu(from->sb_agblocks); | |
418 | to->sb_agcount = be32_to_cpu(from->sb_agcount); | |
419 | to->sb_rbmblocks = be32_to_cpu(from->sb_rbmblocks); | |
420 | to->sb_logblocks = be32_to_cpu(from->sb_logblocks); | |
421 | to->sb_versionnum = be16_to_cpu(from->sb_versionnum); | |
422 | to->sb_sectsize = be16_to_cpu(from->sb_sectsize); | |
423 | to->sb_inodesize = be16_to_cpu(from->sb_inodesize); | |
424 | to->sb_inopblock = be16_to_cpu(from->sb_inopblock); | |
425 | memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname)); | |
426 | to->sb_blocklog = from->sb_blocklog; | |
427 | to->sb_sectlog = from->sb_sectlog; | |
428 | to->sb_inodelog = from->sb_inodelog; | |
429 | to->sb_inopblog = from->sb_inopblog; | |
430 | to->sb_agblklog = from->sb_agblklog; | |
431 | to->sb_rextslog = from->sb_rextslog; | |
432 | to->sb_inprogress = from->sb_inprogress; | |
433 | to->sb_imax_pct = from->sb_imax_pct; | |
434 | to->sb_icount = be64_to_cpu(from->sb_icount); | |
435 | to->sb_ifree = be64_to_cpu(from->sb_ifree); | |
436 | to->sb_fdblocks = be64_to_cpu(from->sb_fdblocks); | |
437 | to->sb_frextents = be64_to_cpu(from->sb_frextents); | |
438 | to->sb_uquotino = be64_to_cpu(from->sb_uquotino); | |
439 | to->sb_gquotino = be64_to_cpu(from->sb_gquotino); | |
440 | to->sb_qflags = be16_to_cpu(from->sb_qflags); | |
441 | to->sb_flags = from->sb_flags; | |
442 | to->sb_shared_vn = from->sb_shared_vn; | |
443 | to->sb_inoalignmt = be32_to_cpu(from->sb_inoalignmt); | |
444 | to->sb_unit = be32_to_cpu(from->sb_unit); | |
445 | to->sb_width = be32_to_cpu(from->sb_width); | |
446 | to->sb_dirblklog = from->sb_dirblklog; | |
447 | to->sb_logsectlog = from->sb_logsectlog; | |
448 | to->sb_logsectsize = be16_to_cpu(from->sb_logsectsize); | |
449 | to->sb_logsunit = be32_to_cpu(from->sb_logsunit); | |
450 | to->sb_features2 = be32_to_cpu(from->sb_features2); | |
451 | to->sb_bad_features2 = be32_to_cpu(from->sb_bad_features2); | |
452 | to->sb_features_compat = be32_to_cpu(from->sb_features_compat); | |
453 | to->sb_features_ro_compat = be32_to_cpu(from->sb_features_ro_compat); | |
454 | to->sb_features_incompat = be32_to_cpu(from->sb_features_incompat); | |
455 | to->sb_features_log_incompat = | |
456 | be32_to_cpu(from->sb_features_log_incompat); | |
457 | to->sb_pad = 0; | |
458 | to->sb_pquotino = be64_to_cpu(from->sb_pquotino); | |
459 | to->sb_lsn = be64_to_cpu(from->sb_lsn); | |
460 | } | |
461 | ||
462 | static inline void | |
463 | xfs_sb_quota_to_disk( | |
464 | xfs_dsb_t *to, | |
465 | xfs_sb_t *from, | |
466 | __int64_t *fields) | |
467 | { | |
468 | __uint16_t qflags = from->sb_qflags; | |
469 | ||
470 | /* | |
471 | * We need to do these manipilations only if we are working | |
472 | * with an older version of on-disk superblock. | |
473 | */ | |
474 | if (xfs_sb_version_has_pquotino(from)) | |
475 | return; | |
476 | ||
477 | if (*fields & XFS_SB_QFLAGS) { | |
478 | /* | |
479 | * The in-core version of sb_qflags do not have | |
480 | * XFS_OQUOTA_* flags, whereas the on-disk version | |
481 | * does. So, convert incore XFS_{PG}QUOTA_* flags | |
482 | * to on-disk XFS_OQUOTA_* flags. | |
483 | */ | |
484 | qflags &= ~(XFS_PQUOTA_ENFD | XFS_PQUOTA_CHKD | | |
485 | XFS_GQUOTA_ENFD | XFS_GQUOTA_CHKD); | |
486 | ||
487 | if (from->sb_qflags & | |
488 | (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD)) | |
489 | qflags |= XFS_OQUOTA_ENFD; | |
490 | if (from->sb_qflags & | |
491 | (XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD)) | |
492 | qflags |= XFS_OQUOTA_CHKD; | |
493 | to->sb_qflags = cpu_to_be16(qflags); | |
494 | *fields &= ~XFS_SB_QFLAGS; | |
495 | } | |
496 | ||
497 | /* | |
498 | * GQUOTINO and PQUOTINO cannot be used together in versions | |
499 | * of superblock that do not have pquotino. from->sb_flags | |
500 | * tells us which quota is active and should be copied to | |
501 | * disk. | |
502 | */ | |
503 | if ((*fields & XFS_SB_GQUOTINO) && | |
504 | (from->sb_qflags & XFS_GQUOTA_ACCT)) | |
505 | to->sb_gquotino = cpu_to_be64(from->sb_gquotino); | |
506 | else if ((*fields & XFS_SB_PQUOTINO) && | |
507 | (from->sb_qflags & XFS_PQUOTA_ACCT)) | |
508 | to->sb_gquotino = cpu_to_be64(from->sb_pquotino); | |
509 | ||
510 | *fields &= ~(XFS_SB_PQUOTINO | XFS_SB_GQUOTINO); | |
511 | } | |
512 | ||
513 | /* | |
514 | * Copy in core superblock to ondisk one. | |
515 | * | |
516 | * The fields argument is mask of superblock fields to copy. | |
517 | */ | |
518 | void | |
519 | xfs_sb_to_disk( | |
520 | xfs_dsb_t *to, | |
521 | xfs_sb_t *from, | |
522 | __int64_t fields) | |
523 | { | |
524 | xfs_caddr_t to_ptr = (xfs_caddr_t)to; | |
525 | xfs_caddr_t from_ptr = (xfs_caddr_t)from; | |
526 | xfs_sb_field_t f; | |
527 | int first; | |
528 | int size; | |
529 | ||
530 | ASSERT(fields); | |
531 | if (!fields) | |
532 | return; | |
533 | ||
534 | xfs_sb_quota_to_disk(to, from, &fields); | |
535 | while (fields) { | |
536 | f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields); | |
537 | first = xfs_sb_info[f].offset; | |
538 | size = xfs_sb_info[f + 1].offset - first; | |
539 | ||
540 | ASSERT(xfs_sb_info[f].type == 0 || xfs_sb_info[f].type == 1); | |
541 | ||
542 | if (size == 1 || xfs_sb_info[f].type == 1) { | |
543 | memcpy(to_ptr + first, from_ptr + first, size); | |
544 | } else { | |
545 | switch (size) { | |
546 | case 2: | |
547 | *(__be16 *)(to_ptr + first) = | |
548 | cpu_to_be16(*(__u16 *)(from_ptr + first)); | |
549 | break; | |
550 | case 4: | |
551 | *(__be32 *)(to_ptr + first) = | |
552 | cpu_to_be32(*(__u32 *)(from_ptr + first)); | |
553 | break; | |
554 | case 8: | |
555 | *(__be64 *)(to_ptr + first) = | |
556 | cpu_to_be64(*(__u64 *)(from_ptr + first)); | |
557 | break; | |
558 | default: | |
559 | ASSERT(0); | |
560 | } | |
561 | } | |
562 | ||
563 | fields &= ~(1LL << f); | |
564 | } | |
565 | } | |
566 | ||
567 | static int | |
568 | xfs_sb_verify( | |
569 | struct xfs_buf *bp, | |
570 | bool check_version) | |
571 | { | |
572 | struct xfs_mount *mp = bp->b_target->bt_mount; | |
573 | struct xfs_sb sb; | |
574 | ||
575 | xfs_sb_from_disk(&sb, XFS_BUF_TO_SBP(bp)); | |
576 | ||
577 | /* | |
578 | * Only check the in progress field for the primary superblock as | |
579 | * mkfs.xfs doesn't clear it from secondary superblocks. | |
580 | */ | |
581 | return xfs_mount_validate_sb(mp, &sb, bp->b_bn == XFS_SB_DADDR, | |
582 | check_version); | |
583 | } | |
584 | ||
585 | /* | |
586 | * If the superblock has the CRC feature bit set or the CRC field is non-null, | |
587 | * check that the CRC is valid. We check the CRC field is non-null because a | |
588 | * single bit error could clear the feature bit and unused parts of the | |
589 | * superblock are supposed to be zero. Hence a non-null crc field indicates that | |
590 | * we've potentially lost a feature bit and we should check it anyway. | |
10e6e65d ES |
591 | * |
592 | * However, past bugs (i.e. in growfs) left non-zeroed regions beyond the | |
593 | * last field in V4 secondary superblocks. So for secondary superblocks, | |
594 | * we are more forgiving, and ignore CRC failures if the primary doesn't | |
595 | * indicate that the fs version is V5. | |
ff55068c DC |
596 | */ |
597 | static void | |
598 | xfs_sb_read_verify( | |
599 | struct xfs_buf *bp) | |
600 | { | |
601 | struct xfs_mount *mp = bp->b_target->bt_mount; | |
602 | struct xfs_dsb *dsb = XFS_BUF_TO_SBP(bp); | |
603 | int error; | |
604 | ||
605 | /* | |
606 | * open code the version check to avoid needing to convert the entire | |
607 | * superblock from disk order just to check the version number | |
608 | */ | |
609 | if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC) && | |
610 | (((be16_to_cpu(dsb->sb_versionnum) & XFS_SB_VERSION_NUMBITS) == | |
611 | XFS_SB_VERSION_5) || | |
612 | dsb->sb_crc != 0)) { | |
613 | ||
51582170 | 614 | if (!xfs_buf_verify_cksum(bp, XFS_SB_CRC_OFF)) { |
10e6e65d | 615 | /* Only fail bad secondaries on a known V5 filesystem */ |
7a01e707 | 616 | if (bp->b_bn == XFS_SB_DADDR || |
10e6e65d | 617 | xfs_sb_version_hascrc(&mp->m_sb)) { |
ce5028cf | 618 | error = EFSBADCRC; |
10e6e65d ES |
619 | goto out_error; |
620 | } | |
ff55068c DC |
621 | } |
622 | } | |
623 | error = xfs_sb_verify(bp, true); | |
624 | ||
625 | out_error: | |
626 | if (error) { | |
ff55068c | 627 | xfs_buf_ioerror(bp, error); |
ce5028cf ES |
628 | if (error == EFSCORRUPTED || error == EFSBADCRC) |
629 | xfs_verifier_error(bp); | |
ff55068c DC |
630 | } |
631 | } | |
632 | ||
633 | /* | |
634 | * We may be probed for a filesystem match, so we may not want to emit | |
635 | * messages when the superblock buffer is not actually an XFS superblock. | |
2533787a | 636 | * If we find an XFS superblock, then run a normal, noisy mount because we are |
ff55068c DC |
637 | * really going to mount it and want to know about errors. |
638 | */ | |
639 | static void | |
640 | xfs_sb_quiet_read_verify( | |
641 | struct xfs_buf *bp) | |
642 | { | |
643 | struct xfs_dsb *dsb = XFS_BUF_TO_SBP(bp); | |
644 | ||
ff55068c DC |
645 | if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC)) { |
646 | /* XFS filesystem, verify noisily! */ | |
647 | xfs_sb_read_verify(bp); | |
648 | return; | |
649 | } | |
650 | /* quietly fail */ | |
651 | xfs_buf_ioerror(bp, EWRONGFS); | |
652 | } | |
653 | ||
654 | static void | |
655 | xfs_sb_write_verify( | |
656 | struct xfs_buf *bp) | |
657 | { | |
658 | struct xfs_mount *mp = bp->b_target->bt_mount; | |
659 | struct xfs_buf_log_item *bip = bp->b_fspriv; | |
660 | int error; | |
661 | ||
662 | error = xfs_sb_verify(bp, false); | |
663 | if (error) { | |
ff55068c | 664 | xfs_buf_ioerror(bp, error); |
ce5028cf | 665 | xfs_verifier_error(bp); |
ff55068c DC |
666 | return; |
667 | } | |
668 | ||
669 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
670 | return; | |
671 | ||
672 | if (bip) | |
673 | XFS_BUF_TO_SBP(bp)->sb_lsn = cpu_to_be64(bip->bli_item.li_lsn); | |
674 | ||
f1dbcd7e | 675 | xfs_buf_update_cksum(bp, XFS_SB_CRC_OFF); |
ff55068c DC |
676 | } |
677 | ||
678 | const struct xfs_buf_ops xfs_sb_buf_ops = { | |
679 | .verify_read = xfs_sb_read_verify, | |
680 | .verify_write = xfs_sb_write_verify, | |
681 | }; | |
682 | ||
683 | const struct xfs_buf_ops xfs_sb_quiet_buf_ops = { | |
684 | .verify_read = xfs_sb_quiet_read_verify, | |
685 | .verify_write = xfs_sb_write_verify, | |
686 | }; | |
687 | ||
688 | /* | |
689 | * xfs_mount_common | |
690 | * | |
691 | * Mount initialization code establishing various mount | |
692 | * fields from the superblock associated with the given | |
693 | * mount structure | |
694 | */ | |
695 | void | |
696 | xfs_sb_mount_common( | |
697 | struct xfs_mount *mp, | |
698 | struct xfs_sb *sbp) | |
699 | { | |
700 | mp->m_agfrotor = mp->m_agirotor = 0; | |
701 | spin_lock_init(&mp->m_agirotor_lock); | |
702 | mp->m_maxagi = mp->m_sb.sb_agcount; | |
703 | mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG; | |
704 | mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT; | |
705 | mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT; | |
706 | mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1; | |
707 | mp->m_agino_log = sbp->sb_inopblog + sbp->sb_agblklog; | |
708 | mp->m_blockmask = sbp->sb_blocksize - 1; | |
709 | mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG; | |
710 | mp->m_blockwmask = mp->m_blockwsize - 1; | |
711 | ||
712 | mp->m_alloc_mxr[0] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 1); | |
713 | mp->m_alloc_mxr[1] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 0); | |
714 | mp->m_alloc_mnr[0] = mp->m_alloc_mxr[0] / 2; | |
715 | mp->m_alloc_mnr[1] = mp->m_alloc_mxr[1] / 2; | |
716 | ||
717 | mp->m_inobt_mxr[0] = xfs_inobt_maxrecs(mp, sbp->sb_blocksize, 1); | |
718 | mp->m_inobt_mxr[1] = xfs_inobt_maxrecs(mp, sbp->sb_blocksize, 0); | |
719 | mp->m_inobt_mnr[0] = mp->m_inobt_mxr[0] / 2; | |
720 | mp->m_inobt_mnr[1] = mp->m_inobt_mxr[1] / 2; | |
721 | ||
722 | mp->m_bmap_dmxr[0] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 1); | |
723 | mp->m_bmap_dmxr[1] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 0); | |
724 | mp->m_bmap_dmnr[0] = mp->m_bmap_dmxr[0] / 2; | |
725 | mp->m_bmap_dmnr[1] = mp->m_bmap_dmxr[1] / 2; | |
726 | ||
727 | mp->m_bsize = XFS_FSB_TO_BB(mp, 1); | |
728 | mp->m_ialloc_inos = (int)MAX((__uint16_t)XFS_INODES_PER_CHUNK, | |
729 | sbp->sb_inopblock); | |
730 | mp->m_ialloc_blks = mp->m_ialloc_inos >> sbp->sb_inopblog; | |
731 | } | |
732 | ||
733 | /* | |
734 | * xfs_initialize_perag_data | |
735 | * | |
736 | * Read in each per-ag structure so we can count up the number of | |
737 | * allocated inodes, free inodes and used filesystem blocks as this | |
738 | * information is no longer persistent in the superblock. Once we have | |
739 | * this information, write it into the in-core superblock structure. | |
740 | */ | |
741 | int | |
742 | xfs_initialize_perag_data( | |
743 | struct xfs_mount *mp, | |
744 | xfs_agnumber_t agcount) | |
745 | { | |
746 | xfs_agnumber_t index; | |
747 | xfs_perag_t *pag; | |
748 | xfs_sb_t *sbp = &mp->m_sb; | |
749 | uint64_t ifree = 0; | |
750 | uint64_t ialloc = 0; | |
751 | uint64_t bfree = 0; | |
752 | uint64_t bfreelst = 0; | |
753 | uint64_t btree = 0; | |
754 | int error; | |
755 | ||
756 | for (index = 0; index < agcount; index++) { | |
757 | /* | |
758 | * read the agf, then the agi. This gets us | |
759 | * all the information we need and populates the | |
760 | * per-ag structures for us. | |
761 | */ | |
762 | error = xfs_alloc_pagf_init(mp, NULL, index, 0); | |
763 | if (error) | |
764 | return error; | |
765 | ||
766 | error = xfs_ialloc_pagi_init(mp, NULL, index); | |
767 | if (error) | |
768 | return error; | |
769 | pag = xfs_perag_get(mp, index); | |
770 | ifree += pag->pagi_freecount; | |
771 | ialloc += pag->pagi_count; | |
772 | bfree += pag->pagf_freeblks; | |
773 | bfreelst += pag->pagf_flcount; | |
774 | btree += pag->pagf_btreeblks; | |
775 | xfs_perag_put(pag); | |
776 | } | |
777 | /* | |
778 | * Overwrite incore superblock counters with just-read data | |
779 | */ | |
780 | spin_lock(&mp->m_sb_lock); | |
781 | sbp->sb_ifree = ifree; | |
782 | sbp->sb_icount = ialloc; | |
783 | sbp->sb_fdblocks = bfree + bfreelst + btree; | |
784 | spin_unlock(&mp->m_sb_lock); | |
785 | ||
786 | /* Fixup the per-cpu counters as well. */ | |
787 | xfs_icsb_reinit_counters(mp); | |
788 | ||
789 | return 0; | |
790 | } | |
791 | ||
792 | /* | |
793 | * xfs_mod_sb() can be used to copy arbitrary changes to the | |
794 | * in-core superblock into the superblock buffer to be logged. | |
795 | * It does not provide the higher level of locking that is | |
796 | * needed to protect the in-core superblock from concurrent | |
797 | * access. | |
798 | */ | |
799 | void | |
800 | xfs_mod_sb(xfs_trans_t *tp, __int64_t fields) | |
801 | { | |
802 | xfs_buf_t *bp; | |
803 | int first; | |
804 | int last; | |
805 | xfs_mount_t *mp; | |
806 | xfs_sb_field_t f; | |
807 | ||
808 | ASSERT(fields); | |
809 | if (!fields) | |
810 | return; | |
811 | mp = tp->t_mountp; | |
812 | bp = xfs_trans_getsb(tp, mp, 0); | |
813 | first = sizeof(xfs_sb_t); | |
814 | last = 0; | |
815 | ||
816 | /* translate/copy */ | |
817 | ||
818 | xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, fields); | |
819 | ||
820 | /* find modified range */ | |
821 | f = (xfs_sb_field_t)xfs_highbit64((__uint64_t)fields); | |
822 | ASSERT((1LL << f) & XFS_SB_MOD_BITS); | |
823 | last = xfs_sb_info[f + 1].offset - 1; | |
824 | ||
825 | f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields); | |
826 | ASSERT((1LL << f) & XFS_SB_MOD_BITS); | |
827 | first = xfs_sb_info[f].offset; | |
828 | ||
829 | xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF); | |
830 | xfs_trans_log_buf(tp, bp, first, last); | |
831 | } |