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1 | /* | |
2 | * Copyright (c) 2000-2003,2005 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 "libfrog.h" | |
19 | #include "libxfs.h" | |
20 | #include "libxcmd.h" | |
21 | #include "libxlog.h" | |
22 | #include "agheader.h" | |
23 | #include "globals.h" | |
24 | #include "protos.h" | |
25 | #include "err_protos.h" | |
26 | #include "xfs_multidisk.h" | |
27 | ||
28 | #define BSIZE (1024 * 1024) | |
29 | ||
30 | /* | |
31 | * copy the fields of a superblock that are present in primary and | |
32 | * secondaries -- preserve fields that are different in the primary. | |
33 | */ | |
34 | static void | |
35 | copy_sb(xfs_sb_t *source, xfs_sb_t *dest) | |
36 | { | |
37 | xfs_ino_t rootino; | |
38 | xfs_ino_t rbmino; | |
39 | xfs_ino_t rsumino; | |
40 | xfs_ino_t uquotino; | |
41 | xfs_ino_t gquotino; | |
42 | xfs_ino_t pquotino; | |
43 | uint16_t versionnum; | |
44 | ||
45 | rootino = dest->sb_rootino; | |
46 | rbmino = dest->sb_rbmino; | |
47 | rsumino = dest->sb_rsumino; | |
48 | uquotino = dest->sb_uquotino; | |
49 | gquotino = dest->sb_gquotino; | |
50 | pquotino = dest->sb_pquotino; | |
51 | ||
52 | versionnum = dest->sb_versionnum; | |
53 | ||
54 | *dest = *source; | |
55 | ||
56 | dest->sb_rootino = rootino; | |
57 | dest->sb_rbmino = rbmino; | |
58 | dest->sb_rsumino = rsumino; | |
59 | dest->sb_uquotino = uquotino; | |
60 | dest->sb_gquotino = gquotino; | |
61 | dest->sb_pquotino = pquotino; | |
62 | ||
63 | dest->sb_versionnum = versionnum; | |
64 | ||
65 | /* | |
66 | * copy over version bits that are stamped into all | |
67 | * secondaries and cannot be changed at run time in | |
68 | * the primary superblock | |
69 | */ | |
70 | if (xfs_sb_version_hasdalign(source)) | |
71 | dest->sb_versionnum |= XFS_SB_VERSION_DALIGNBIT; | |
72 | if (xfs_sb_version_hasextflgbit(source)) | |
73 | dest->sb_versionnum |= XFS_SB_VERSION_EXTFLGBIT; | |
74 | ||
75 | /* | |
76 | * these are all supposed to be zero or will get reset anyway | |
77 | */ | |
78 | dest->sb_icount = 0; | |
79 | dest->sb_ifree = 0; | |
80 | dest->sb_fdblocks = 0; | |
81 | dest->sb_frextents = 0; | |
82 | ||
83 | memset(source->sb_fname, 0, 12); | |
84 | } | |
85 | ||
86 | int | |
87 | verify_sb_blocksize(xfs_sb_t *sb) | |
88 | { | |
89 | /* check to make sure blocksize is legal 2^N, 9 <= N <= 16 */ | |
90 | if (sb->sb_blocksize == 0) | |
91 | return XR_BAD_BLOCKSIZE; | |
92 | if (sb->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG || | |
93 | sb->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG) | |
94 | return XR_BAD_BLOCKLOG; | |
95 | if (sb->sb_blocksize != (1 << sb->sb_blocklog)) | |
96 | return XR_BAD_BLOCKLOG; | |
97 | ||
98 | return 0; | |
99 | } | |
100 | ||
101 | /* | |
102 | * find a secondary superblock, copy it into the sb buffer. | |
103 | * start is the point to begin reading BSIZE bytes. | |
104 | * skip contains a byte-count of how far to advance for next read. | |
105 | */ | |
106 | static int | |
107 | __find_secondary_sb( | |
108 | xfs_sb_t *rsb, | |
109 | uint64_t start, | |
110 | uint64_t skip) | |
111 | { | |
112 | xfs_off_t off; | |
113 | xfs_sb_t *sb; | |
114 | xfs_sb_t bufsb; | |
115 | char *c_bufsb; | |
116 | int done; | |
117 | int i; | |
118 | int dirty; | |
119 | int retval; | |
120 | int bsize; | |
121 | ||
122 | sb = (xfs_sb_t *)memalign(libxfs_device_alignment(), BSIZE); | |
123 | if (!sb) { | |
124 | do_error( | |
125 | _("error finding secondary superblock -- failed to memalign buffer\n")); | |
126 | exit(1); | |
127 | } | |
128 | ||
129 | memset(&bufsb, 0, sizeof(xfs_sb_t)); | |
130 | retval = 0; | |
131 | dirty = 0; | |
132 | bsize = 0; | |
133 | ||
134 | /* | |
135 | * skip first sector since we know that's bad | |
136 | */ | |
137 | for (done = 0, off = start; !done ; off += skip) { | |
138 | /* | |
139 | * read disk 1 MByte at a time. | |
140 | */ | |
141 | if (lseek(x.dfd, off, SEEK_SET) != off) { | |
142 | done = 1; | |
143 | } | |
144 | ||
145 | if (!done && (bsize = read(x.dfd, sb, BSIZE)) <= 0) { | |
146 | done = 1; | |
147 | } | |
148 | ||
149 | do_warn("."); | |
150 | ||
151 | /* | |
152 | * check the buffer 512 bytes at a time since | |
153 | * we don't know how big the sectors really are. | |
154 | */ | |
155 | for (i = 0; !done && i < bsize; i += BBSIZE) { | |
156 | c_bufsb = (char *)sb + i; | |
157 | libxfs_sb_from_disk(&bufsb, (xfs_dsb_t *)c_bufsb); | |
158 | ||
159 | if (verify_sb(c_bufsb, &bufsb, 0) != XR_OK) | |
160 | continue; | |
161 | ||
162 | do_warn(_("found candidate secondary superblock...\n")); | |
163 | ||
164 | /* | |
165 | * found one. now verify it by looking | |
166 | * for other secondaries. | |
167 | */ | |
168 | memmove(rsb, &bufsb, sizeof(xfs_sb_t)); | |
169 | rsb->sb_inprogress = 0; | |
170 | copied_sunit = 1; | |
171 | ||
172 | if (verify_set_primary_sb(rsb, 0, &dirty) == XR_OK) { | |
173 | do_warn( | |
174 | _("verified secondary superblock...\n")); | |
175 | done = 1; | |
176 | retval = 1; | |
177 | } else { | |
178 | do_warn( | |
179 | _("unable to verify superblock, continuing...\n")); | |
180 | } | |
181 | } | |
182 | } | |
183 | ||
184 | free(sb); | |
185 | return retval; | |
186 | } | |
187 | ||
188 | static int | |
189 | guess_default_geometry( | |
190 | uint64_t *agsize, | |
191 | uint64_t *agcount, | |
192 | libxfs_init_t *x) | |
193 | { | |
194 | struct fs_topology ft; | |
195 | int blocklog; | |
196 | uint64_t dblocks; | |
197 | int multidisk; | |
198 | ||
199 | memset(&ft, 0, sizeof(ft)); | |
200 | get_topology(x, &ft, 1); | |
201 | ||
202 | /* | |
203 | * get geometry from get_topology result. | |
204 | * Use default block size (2^12) | |
205 | */ | |
206 | blocklog = 12; | |
207 | multidisk = ft.dswidth | ft.dsunit; | |
208 | dblocks = x->dsize >> (blocklog - BBSHIFT); | |
209 | calc_default_ag_geometry(blocklog, dblocks, multidisk, | |
210 | agsize, agcount); | |
211 | ||
212 | return blocklog; | |
213 | } | |
214 | ||
215 | int | |
216 | find_secondary_sb(xfs_sb_t *rsb) | |
217 | { | |
218 | int retval = 0; | |
219 | uint64_t agcount; | |
220 | uint64_t agsize; | |
221 | uint64_t skip; | |
222 | int blocklog; | |
223 | ||
224 | /* | |
225 | * Attempt to find secondary sb with a coarse approach, | |
226 | * first trying agblocks and blocksize read from sb, providing | |
227 | * they're sane. | |
228 | */ | |
229 | do_warn(_("\nattempting to find secondary superblock...\n")); | |
230 | ||
231 | if (verify_sb_blocksize(rsb) == 0) { | |
232 | skip = (uint64_t)rsb->sb_agblocks * rsb->sb_blocksize; | |
233 | if (skip >= XFS_AG_MIN_BYTES && skip <= XFS_AG_MAX_BYTES) | |
234 | retval = __find_secondary_sb(rsb, skip, skip); | |
235 | } | |
236 | ||
237 | /* If that failed, retry coarse approach, using default geometry */ | |
238 | if (!retval) { | |
239 | blocklog = guess_default_geometry(&agsize, &agcount, &x); | |
240 | skip = agsize << blocklog; | |
241 | retval = __find_secondary_sb(rsb, skip, skip); | |
242 | } | |
243 | ||
244 | /* If that failed, fall back to the brute force method */ | |
245 | if (!retval) | |
246 | retval = __find_secondary_sb(rsb, XFS_AG_MIN_BYTES, BSIZE); | |
247 | ||
248 | return retval; | |
249 | } | |
250 | ||
251 | /* | |
252 | * Calculate what the inode alignment field ought to be based on internal | |
253 | * superblock info and determine if it is valid. | |
254 | * | |
255 | * For standard v5 superblocks, the inode alignment must either match | |
256 | * XFS_INODE_BIG_CLUSTER_SIZE or a multiple based on the inode size. For v5 | |
257 | * superblocks with sparse inode chunks enabled, inode alignment must match the | |
258 | * inode chunk size. | |
259 | * | |
260 | * Return true if the alignment is valid, false otherwise. | |
261 | */ | |
262 | static bool | |
263 | sb_validate_ino_align(struct xfs_sb *sb) | |
264 | { | |
265 | xfs_extlen_t align; | |
266 | ||
267 | if (!xfs_sb_version_hasalign(sb)) | |
268 | return true; | |
269 | ||
270 | /* standard cluster size alignment is always valid */ | |
271 | align = XFS_INODE_BIG_CLUSTER_SIZE >> sb->sb_blocklog; | |
272 | if (align == sb->sb_inoalignmt) | |
273 | return true; | |
274 | ||
275 | /* alignment scaled by inode size is v5 only for now */ | |
276 | if (!xfs_sb_version_hascrc(sb)) | |
277 | return false; | |
278 | ||
279 | align = (XFS_INODE_BIG_CLUSTER_SIZE * | |
280 | sb->sb_inodesize / XFS_DINODE_MIN_SIZE) >> sb->sb_blocklog; | |
281 | if (align == sb->sb_inoalignmt) | |
282 | return true; | |
283 | ||
284 | /* | |
285 | * Sparse inodes requires inoalignmt to match full inode chunk size and | |
286 | * spino_align to match the scaled alignment (as calculated above). | |
287 | */ | |
288 | if (xfs_sb_version_hassparseinodes(sb)) { | |
289 | if (align != sb->sb_spino_align) | |
290 | return false; | |
291 | ||
292 | align = (sb->sb_inodesize * XFS_INODES_PER_CHUNK) | |
293 | >> sb->sb_blocklog; | |
294 | if (align == sb->sb_inoalignmt) | |
295 | return true; | |
296 | } | |
297 | ||
298 | return false; | |
299 | } | |
300 | ||
301 | /* | |
302 | * Validate the given log space. Derived from xfs_log_mount, though we | |
303 | * can't validate the minimum log size until later. We only do this | |
304 | * validation on V5 filesystems because the kernel doesn't reject malformed | |
305 | * log geometry on older revision filesystems. | |
306 | * | |
307 | * Returns false if the log is garbage. | |
308 | */ | |
309 | static bool | |
310 | verify_sb_loginfo( | |
311 | struct xfs_sb *sb) | |
312 | { | |
313 | if (xfs_sb_version_hascrc(sb) && | |
314 | (sb->sb_logblocks == 0 || | |
315 | sb->sb_logblocks > XFS_MAX_LOG_BLOCKS || | |
316 | ((unsigned long long)sb->sb_logblocks << sb->sb_blocklog) > | |
317 | XFS_MAX_LOG_BYTES)) | |
318 | return false; | |
319 | ||
320 | if (sb->sb_logsunit > 1 && sb->sb_logsunit % sb->sb_blocksize) | |
321 | return false; | |
322 | ||
323 | return true; | |
324 | } | |
325 | ||
326 | /* | |
327 | * verify a superblock -- does not verify root inode # | |
328 | * can only check that geometry info is internally | |
329 | * consistent. because of growfs, that's no guarantee | |
330 | * of correctness (e.g. geometry may have changed) | |
331 | * | |
332 | * fields verified or consistency checked: | |
333 | * | |
334 | * sb_magicnum | |
335 | * | |
336 | * sb_versionnum | |
337 | * | |
338 | * sb_inprogress | |
339 | * | |
340 | * sb_blocksize (as a group) | |
341 | * sb_blocklog | |
342 | * | |
343 | * geometry info - sb_dblocks (as a group) | |
344 | * sb_agcount | |
345 | * sb_agblocks | |
346 | * sb_agblklog | |
347 | * | |
348 | * inode info - sb_inodesize (x-checked with geo info) | |
349 | * sb_inopblock | |
350 | * | |
351 | * sector size info - | |
352 | * sb_sectsize | |
353 | * sb_sectlog | |
354 | * sb_logsectsize | |
355 | * sb_logsectlog | |
356 | * | |
357 | * not checked here - | |
358 | * sb_rootino | |
359 | * sb_fname | |
360 | * sb_fpack | |
361 | * sb_logstart | |
362 | * sb_uuid | |
363 | * | |
364 | * ALL real-time fields | |
365 | * final 4 summary counters | |
366 | */ | |
367 | ||
368 | int | |
369 | verify_sb(char *sb_buf, xfs_sb_t *sb, int is_primary_sb) | |
370 | { | |
371 | uint32_t bsize; | |
372 | int i; | |
373 | int ret; | |
374 | ||
375 | /* check magic number and version number */ | |
376 | ||
377 | if (sb->sb_magicnum != XFS_SB_MAGIC) | |
378 | return(XR_BAD_MAGIC); | |
379 | ||
380 | if (!xfs_sb_good_version(sb)) | |
381 | return(XR_BAD_VERSION); | |
382 | ||
383 | /* does sb think mkfs really finished ? */ | |
384 | ||
385 | if (is_primary_sb && sb->sb_inprogress == 1) | |
386 | return(XR_BAD_INPROGRESS); | |
387 | ||
388 | /* | |
389 | * before going *any further*, validate the sector size and if the | |
390 | * version says we should have CRCs enabled, validate that. | |
391 | */ | |
392 | ||
393 | /* check to make sure sectorsize is legal 2^N, 9 <= N <= 15 */ | |
394 | if (sb->sb_sectsize == 0) | |
395 | return(XR_BAD_SECT_SIZE_DATA); | |
396 | ||
397 | bsize = 1; | |
398 | for (i = 0; bsize < sb->sb_sectsize && | |
399 | i < sizeof(sb->sb_sectsize) * NBBY; i++) { | |
400 | bsize <<= 1; | |
401 | } | |
402 | ||
403 | if (i < XFS_MIN_SECTORSIZE_LOG || i > XFS_MAX_SECTORSIZE_LOG) | |
404 | return(XR_BAD_SECT_SIZE_DATA); | |
405 | ||
406 | /* check sb sectorsize field against sb sectlog field */ | |
407 | if (i != sb->sb_sectlog) | |
408 | return(XR_BAD_SECT_SIZE_DATA); | |
409 | ||
410 | /* sector size in range - CRC check time */ | |
411 | if (xfs_sb_version_hascrc(sb) && | |
412 | !libxfs_verify_cksum(sb_buf, sb->sb_sectsize, XFS_SB_CRC_OFF)) | |
413 | return XR_BAD_CRC; | |
414 | ||
415 | /* check to ensure blocksize and blocklog are legal */ | |
416 | ret = verify_sb_blocksize(sb); | |
417 | if (ret != 0) | |
418 | return ret; | |
419 | ||
420 | /* sanity check ag count, size fields against data size field */ | |
421 | ||
422 | if (sb->sb_dblocks == 0 || | |
423 | sb->sb_dblocks > XFS_MAX_DBLOCKS(sb) || | |
424 | sb->sb_dblocks < XFS_MIN_DBLOCKS(sb)) | |
425 | return(XR_BAD_FS_SIZE_DATA); | |
426 | ||
427 | if (sb->sb_agblklog != (uint8_t)log2_roundup(sb->sb_agblocks)) | |
428 | return(XR_BAD_FS_SIZE_DATA); | |
429 | ||
430 | if (sb->sb_inodesize < XFS_DINODE_MIN_SIZE || | |
431 | sb->sb_inodesize > XFS_DINODE_MAX_SIZE || | |
432 | sb->sb_inodelog < XFS_DINODE_MIN_LOG || | |
433 | sb->sb_inodelog > XFS_DINODE_MAX_LOG || | |
434 | sb->sb_inodesize != (1 << sb->sb_inodelog) || | |
435 | sb->sb_logsunit > XLOG_MAX_RECORD_BSIZE || | |
436 | sb->sb_inopblock != howmany(sb->sb_blocksize, sb->sb_inodesize) || | |
437 | (sb->sb_blocklog - sb->sb_inodelog != sb->sb_inopblog)) | |
438 | return XR_BAD_INO_SIZE_DATA; | |
439 | ||
440 | if (!verify_sb_loginfo(sb)) | |
441 | return XR_BAD_LOG_GEOMETRY; | |
442 | ||
443 | if (xfs_sb_version_hassector(sb)) { | |
444 | ||
445 | /* check to make sure log sector is legal 2^N, 9 <= N <= 15 */ | |
446 | ||
447 | if (sb->sb_logsectsize == 0) | |
448 | return(XR_BAD_SECT_SIZE_DATA); | |
449 | ||
450 | bsize = 1; | |
451 | ||
452 | for (i = 0; bsize < sb->sb_logsectsize && | |
453 | i < sizeof(sb->sb_logsectsize) * NBBY; i++) { | |
454 | bsize <<= 1; | |
455 | } | |
456 | ||
457 | if (i < XFS_MIN_SECTORSIZE_LOG || i > XFS_MAX_SECTORSIZE_LOG) | |
458 | return(XR_BAD_SECT_SIZE_DATA); | |
459 | ||
460 | /* check sb log sectorsize field against sb log sectlog field */ | |
461 | ||
462 | if (i != sb->sb_logsectlog) | |
463 | return(XR_BAD_SECT_SIZE_DATA); | |
464 | } | |
465 | ||
466 | /* | |
467 | * real-time extent size is always set | |
468 | */ | |
469 | if (sb->sb_rextsize * sb->sb_blocksize > XFS_MAX_RTEXTSIZE) | |
470 | return(XR_BAD_RT_GEO_DATA); | |
471 | ||
472 | if (sb->sb_rextsize * sb->sb_blocksize < XFS_MIN_RTEXTSIZE) | |
473 | return(XR_BAD_RT_GEO_DATA); | |
474 | ||
475 | if (sb->sb_rblocks == 0) { | |
476 | if (sb->sb_rextents != 0) | |
477 | return(XR_BAD_RT_GEO_DATA); | |
478 | ||
479 | if (sb->sb_rbmblocks != 0) | |
480 | return(XR_BAD_RT_GEO_DATA); | |
481 | ||
482 | if (sb->sb_rextslog != 0) | |
483 | return(XR_BAD_RT_GEO_DATA); | |
484 | ||
485 | if (sb->sb_frextents != 0) | |
486 | return(XR_BAD_RT_GEO_DATA); | |
487 | } else { | |
488 | /* | |
489 | * if we have a real-time partition, sanity-check geometry | |
490 | */ | |
491 | if (sb->sb_rblocks / sb->sb_rextsize != sb->sb_rextents) | |
492 | return(XR_BAD_RT_GEO_DATA); | |
493 | ||
494 | if (sb->sb_rextslog != | |
495 | libxfs_highbit32((unsigned int)sb->sb_rextents)) | |
496 | return(XR_BAD_RT_GEO_DATA); | |
497 | ||
498 | if (sb->sb_rbmblocks != (xfs_extlen_t) howmany(sb->sb_rextents, | |
499 | NBBY * sb->sb_blocksize)) | |
500 | return(XR_BAD_RT_GEO_DATA); | |
501 | } | |
502 | ||
503 | /* | |
504 | * verify correctness of inode alignment if it's there | |
505 | */ | |
506 | if (!sb_validate_ino_align(sb)) | |
507 | return(XR_BAD_INO_ALIGN); | |
508 | ||
509 | /* | |
510 | * verify max. % of inodes (sb_imax_pct) | |
511 | */ | |
512 | if (sb->sb_imax_pct > 100) | |
513 | return(XR_BAD_INO_MAX_PCT); | |
514 | ||
515 | /* | |
516 | * verify stripe alignment fields if present | |
517 | */ | |
518 | if (xfs_sb_version_hasdalign(sb)) { | |
519 | if ((!sb->sb_unit && sb->sb_width) || | |
520 | (sb->sb_unit && sb->sb_agblocks % sb->sb_unit)) | |
521 | return(XR_BAD_SB_UNIT); | |
522 | if ((sb->sb_unit && !sb->sb_width) || | |
523 | (sb->sb_width && sb->sb_unit && sb->sb_width % sb->sb_unit)) | |
524 | return(XR_BAD_SB_WIDTH); | |
525 | } else if (sb->sb_unit || sb->sb_width) | |
526 | return XR_BAD_SB_WIDTH; | |
527 | ||
528 | /* Directory block log */ | |
529 | if (sb->sb_blocklog + sb->sb_dirblklog > XFS_MAX_BLOCKSIZE_LOG) | |
530 | return XR_BAD_DIR_SIZE_DATA; | |
531 | ||
532 | return(XR_OK); | |
533 | } | |
534 | ||
535 | void | |
536 | write_primary_sb(xfs_sb_t *sbp, int size) | |
537 | { | |
538 | xfs_dsb_t *buf; | |
539 | ||
540 | if (no_modify) | |
541 | return; | |
542 | ||
543 | buf = memalign(libxfs_device_alignment(), size); | |
544 | if (buf == NULL) { | |
545 | do_error(_("failed to memalign superblock buffer\n")); | |
546 | return; | |
547 | } | |
548 | memset(buf, 0, size); | |
549 | ||
550 | if (lseek(x.dfd, 0LL, SEEK_SET) != 0LL) { | |
551 | free(buf); | |
552 | do_error(_("couldn't seek to offset 0 in filesystem\n")); | |
553 | } | |
554 | ||
555 | libxfs_sb_to_disk(buf, sbp); | |
556 | ||
557 | if (xfs_sb_version_hascrc(sbp)) | |
558 | xfs_update_cksum((char *)buf, size, XFS_SB_CRC_OFF); | |
559 | ||
560 | if (write(x.dfd, buf, size) != size) { | |
561 | free(buf); | |
562 | do_error(_("primary superblock write failed!\n")); | |
563 | } | |
564 | ||
565 | free(buf); | |
566 | } | |
567 | ||
568 | /* | |
569 | * get a possible superblock -- checks for internal consistency | |
570 | */ | |
571 | int | |
572 | get_sb(xfs_sb_t *sbp, xfs_off_t off, int size, xfs_agnumber_t agno) | |
573 | { | |
574 | int error, rval; | |
575 | xfs_dsb_t *buf; | |
576 | ||
577 | buf = memalign(libxfs_device_alignment(), size); | |
578 | if (buf == NULL) { | |
579 | do_error( | |
580 | _("error reading superblock %u -- failed to memalign buffer\n"), | |
581 | agno); | |
582 | exit(1); | |
583 | } | |
584 | memset(buf, 0, size); | |
585 | memset(sbp, 0, sizeof(*sbp)); | |
586 | ||
587 | /* try and read it first */ | |
588 | ||
589 | if (lseek(x.dfd, off, SEEK_SET) != off) { | |
590 | do_warn( | |
591 | _("error reading superblock %u -- seek to offset %" PRId64 " failed\n"), | |
592 | agno, off); | |
593 | free(buf); | |
594 | return(XR_EOF); | |
595 | } | |
596 | ||
597 | if ((rval = read(x.dfd, buf, size)) != size) { | |
598 | error = errno; | |
599 | do_warn( | |
600 | _("superblock read failed, offset %" PRId64 ", size %d, ag %u, rval %d\n"), | |
601 | off, size, agno, rval); | |
602 | do_error("%s\n", strerror(error)); | |
603 | } | |
604 | libxfs_sb_from_disk(sbp, buf); | |
605 | ||
606 | rval = verify_sb((char *)buf, sbp, agno == 0); | |
607 | free(buf); | |
608 | return rval; | |
609 | } | |
610 | ||
611 | /* returns element on list with highest reference count */ | |
612 | static fs_geo_list_t * | |
613 | get_best_geo(fs_geo_list_t *list) | |
614 | { | |
615 | int cnt = 0; | |
616 | fs_geo_list_t *current, *rval = NULL; | |
617 | ||
618 | current = list; | |
619 | ||
620 | while (current != NULL) { | |
621 | if (current->refs > cnt) { | |
622 | rval = current; | |
623 | cnt = current->refs; | |
624 | } | |
625 | current = current->next; | |
626 | } | |
627 | ||
628 | return(rval); | |
629 | } | |
630 | ||
631 | /* adds geometry info to linked list. returns (sometimes new) head of list */ | |
632 | static fs_geo_list_t * | |
633 | add_geo(fs_geo_list_t *list, fs_geometry_t *geo_p, int index) | |
634 | { | |
635 | fs_geo_list_t *current = list; | |
636 | ||
637 | while (current != NULL) { | |
638 | if (memcmp(geo_p, ¤t->geo, sizeof(fs_geometry_t)) == 0) { | |
639 | current->refs++; | |
640 | return(list); | |
641 | } | |
642 | ||
643 | current = current->next; | |
644 | } | |
645 | ||
646 | if ((current = malloc(sizeof(fs_geo_list_t))) == NULL) { | |
647 | do_error(_("couldn't malloc geometry structure\n")); | |
648 | exit(1); | |
649 | } | |
650 | ||
651 | current->geo = *geo_p; | |
652 | current->refs = 1; | |
653 | current->next = list; | |
654 | current->index = index; | |
655 | ||
656 | return(current); | |
657 | } | |
658 | ||
659 | static void | |
660 | free_geo(fs_geo_list_t *list) | |
661 | { | |
662 | fs_geo_list_t *next; | |
663 | fs_geo_list_t *current; | |
664 | ||
665 | for (current = list; current != NULL; current = next) { | |
666 | next = current->next; | |
667 | free(current); | |
668 | } | |
669 | } | |
670 | ||
671 | void | |
672 | get_sb_geometry(fs_geometry_t *geo, xfs_sb_t *sbp) | |
673 | { | |
674 | memset(geo, 0, sizeof(fs_geometry_t)); | |
675 | ||
676 | /* | |
677 | * blindly set fields that we know are always good | |
678 | */ | |
679 | geo->sb_blocksize = sbp->sb_blocksize; | |
680 | geo->sb_dblocks = sbp->sb_dblocks; | |
681 | geo->sb_rblocks = sbp->sb_rblocks; | |
682 | geo->sb_rextents = sbp->sb_rextents; | |
683 | geo->sb_logstart = sbp->sb_logstart; | |
684 | geo->sb_rextsize = sbp->sb_rextsize; | |
685 | geo->sb_agblocks = sbp->sb_agblocks; | |
686 | geo->sb_agcount = sbp->sb_agcount; | |
687 | geo->sb_rbmblocks = sbp->sb_rbmblocks; | |
688 | geo->sb_logblocks = sbp->sb_logblocks; | |
689 | geo->sb_sectsize = sbp->sb_sectsize; | |
690 | geo->sb_inodesize = sbp->sb_inodesize; | |
691 | ||
692 | if (xfs_sb_version_hasalign(sbp)) | |
693 | geo->sb_ialignbit = 1; | |
694 | ||
695 | if (xfs_sb_version_hasdalign(sbp)) | |
696 | geo->sb_salignbit = 1; | |
697 | ||
698 | if (xfs_sb_version_hasextflgbit(sbp)) | |
699 | geo->sb_extflgbit = 1; | |
700 | ||
701 | geo->sb_fully_zeroed = 1; | |
702 | } | |
703 | ||
704 | /* | |
705 | * the way to verify that a primary sb is consistent with the | |
706 | * filesystem is find the secondaries given the info in the | |
707 | * primary and compare the geometries in the secondaries against | |
708 | * the geometry indicated by the primary. | |
709 | * | |
710 | * returns 0 if ok, else error code (XR_EOF, XR_INSUFF_SEC_SB, etc). | |
711 | */ | |
712 | int | |
713 | verify_set_primary_sb(xfs_sb_t *rsb, | |
714 | int sb_index, | |
715 | int *sb_modified) | |
716 | { | |
717 | xfs_off_t off; | |
718 | fs_geometry_t geo; | |
719 | xfs_sb_t *sb; | |
720 | fs_geo_list_t *list; | |
721 | fs_geo_list_t *current; | |
722 | xfs_agnumber_t agno; | |
723 | int num_sbs; | |
724 | int size; | |
725 | int num_ok; | |
726 | int retval; | |
727 | ||
728 | /* | |
729 | * We haven't been able to validate the sector size yet properly | |
730 | * (e.g. in the case of repairing an image in a file), so we need to | |
731 | * take into account sector mismatches and so use the maximum possible | |
732 | * sector size rather than the sector size in @rsb. | |
733 | */ | |
734 | size = NUM_AGH_SECTS * (1 << (XFS_MAX_SECTORSIZE_LOG)); | |
735 | list = NULL; | |
736 | num_ok = 0; | |
737 | *sb_modified = 0; | |
738 | num_sbs = rsb->sb_agcount; | |
739 | ||
740 | sb = (xfs_sb_t *) alloc_ag_buf(size); | |
741 | ||
742 | /* | |
743 | * put the primary sb geometry info onto the geometry list | |
744 | */ | |
745 | get_sb_geometry(&geo, rsb); | |
746 | list = add_geo(list, &geo, sb_index); | |
747 | ||
748 | /* | |
749 | * scan the secondaries and check them off as we get them so we only | |
750 | * process each one once | |
751 | */ | |
752 | for (agno = 1; agno < rsb->sb_agcount; agno++) { | |
753 | off = (xfs_off_t)agno * rsb->sb_agblocks << rsb->sb_blocklog; | |
754 | ||
755 | retval = get_sb(sb, off, size, agno); | |
756 | if (retval == XR_EOF) | |
757 | goto out_free_list; | |
758 | ||
759 | if (retval == XR_OK) { | |
760 | /* | |
761 | * save away geometry info. don't bother checking the | |
762 | * sb against the agi/agf as the odds of the sb being | |
763 | * corrupted in a way that it is internally consistent | |
764 | * but not consistent with the rest of the filesystem is | |
765 | * really really low. | |
766 | */ | |
767 | get_sb_geometry(&geo, sb); | |
768 | list = add_geo(list, &geo, agno); | |
769 | num_ok++; | |
770 | } | |
771 | } | |
772 | ||
773 | /* | |
774 | * see if we have enough superblocks to bother with | |
775 | */ | |
776 | retval = 0; | |
777 | if (num_ok < num_sbs / 2) { | |
778 | retval = XR_INSUFF_SEC_SB; | |
779 | goto out_free_list; | |
780 | } | |
781 | ||
782 | current = get_best_geo(list); | |
783 | ||
784 | /* | |
785 | * check that enough sbs agree that we're willing to | |
786 | * go with this geometry. if not, print out the | |
787 | * geometry and a message about the force option. | |
788 | */ | |
789 | switch (num_sbs) { | |
790 | case 2: | |
791 | /* | |
792 | * If we only have two allocation groups, and the superblock | |
793 | * in the second allocation group differs from the primary | |
794 | * superblock we can't verify the geometry information. | |
795 | * Warn the user about this situation and get out unless | |
796 | * explicitly overridden. | |
797 | */ | |
798 | if (current->refs != 2) { | |
799 | if (!force_geo) { | |
800 | do_warn( | |
801 | _("Only two AGs detected and they do not match - " | |
802 | "cannot validate filesystem geometry.\n" | |
803 | "Use the -o force_geometry option to proceed.\n")); | |
804 | exit(1); | |
805 | } | |
806 | } | |
807 | goto out_free_list; | |
808 | case 1: | |
809 | /* | |
810 | * If we only have a single allocation group there is no | |
811 | * secondary superblock that we can use to verify the geometry | |
812 | * information. Warn the user about this situation and get | |
813 | * out unless explicitly overridden. | |
814 | */ | |
815 | if (!force_geo) { | |
816 | do_warn( | |
817 | _("Only one AG detected - " | |
818 | "cannot validate filesystem geometry.\n" | |
819 | "Use the -o force_geometry option to proceed.\n")); | |
820 | exit(1); | |
821 | } | |
822 | goto out_free_list; | |
823 | default: | |
824 | /* | |
825 | * at least half of the probed superblocks have | |
826 | * to agree. if they don't, this fs is probably | |
827 | * too far gone anyway considering the fact that | |
828 | * XFS normally doesn't alter the secondary superblocks. | |
829 | */ | |
830 | if (current->refs < num_sbs / 2) { | |
831 | do_warn( | |
832 | _("Not enough matching superblocks - cannot proceed.\n")); | |
833 | exit(1); | |
834 | } | |
835 | } | |
836 | ||
837 | /* | |
838 | * set the geometry into primary superblock if necessary. | |
839 | */ | |
840 | ||
841 | if (current->index != sb_index) { | |
842 | *sb_modified = 1; | |
843 | off = (xfs_off_t)current->index * current->geo.sb_agblocks | |
844 | * current->geo.sb_blocksize; | |
845 | if (get_sb(sb, off, current->geo.sb_sectsize, | |
846 | current->index) != XR_OK) | |
847 | do_error(_("could not read superblock\n")); | |
848 | ||
849 | copy_sb(sb, rsb); | |
850 | ||
851 | /* | |
852 | * turn off inprogress bit since this is the primary. | |
853 | * also save away values that we need to ensure are | |
854 | * consistent in the other secondaries. | |
855 | */ | |
856 | rsb->sb_inprogress = 0; | |
857 | sb_inoalignmt = sb->sb_inoalignmt; | |
858 | sb_unit = sb->sb_unit; | |
859 | sb_width = sb->sb_width; | |
860 | } | |
861 | ||
862 | out_free_list: | |
863 | free_geo(list); | |
864 | free(sb); | |
865 | return retval; | |
866 | } |