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Commit | Line | Data |
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2bd0ea18 | 1 | /* |
da23017d NS |
2 | * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
dfc130f3 | 4 | * |
da23017d NS |
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 | |
2bd0ea18 | 7 | * published by the Free Software Foundation. |
dfc130f3 | 8 | * |
da23017d NS |
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. | |
dfc130f3 | 13 | * |
da23017d NS |
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 | |
2bd0ea18 NS |
17 | */ |
18 | ||
2bd0ea18 | 19 | #include <libxfs.h> |
b74a1f6a | 20 | #include <libxlog.h> |
2bd0ea18 NS |
21 | #include "agheader.h" |
22 | #include "globals.h" | |
23 | #include "protos.h" | |
24 | #include "err_protos.h" | |
25 | ||
92217f0c NS |
26 | #define BSIZE (1024 * 1024) |
27 | ||
28 | #define XFS_AG_BYTES(bblog) ((long long)BBSIZE << (bblog)) | |
29 | #define XFS_AG_MIN_BYTES ((XFS_AG_BYTES(15))) /* 16 MB */ | |
2bd0ea18 NS |
30 | |
31 | /* | |
32 | * copy the fields of a superblock that are present in primary and | |
33 | * secondaries -- preserve fields that are different in the primary. | |
34 | */ | |
8b8a6b02 | 35 | static void |
2bd0ea18 NS |
36 | copy_sb(xfs_sb_t *source, xfs_sb_t *dest) |
37 | { | |
38 | xfs_ino_t rootino; | |
39 | xfs_ino_t rbmino; | |
40 | xfs_ino_t rsumino; | |
41 | xfs_ino_t uquotino; | |
b36eef04 | 42 | xfs_ino_t gquotino; |
0340d706 | 43 | xfs_ino_t pquotino; |
2bd0ea18 NS |
44 | __uint16_t versionnum; |
45 | ||
46 | rootino = dest->sb_rootino; | |
47 | rbmino = dest->sb_rbmino; | |
48 | rsumino = dest->sb_rsumino; | |
49 | uquotino = dest->sb_uquotino; | |
b36eef04 | 50 | gquotino = dest->sb_gquotino; |
0340d706 | 51 | pquotino = dest->sb_pquotino; |
2bd0ea18 NS |
52 | |
53 | versionnum = dest->sb_versionnum; | |
54 | ||
55 | *dest = *source; | |
56 | ||
57 | dest->sb_rootino = rootino; | |
58 | dest->sb_rbmino = rbmino; | |
59 | dest->sb_rsumino = rsumino; | |
60 | dest->sb_uquotino = uquotino; | |
b36eef04 | 61 | dest->sb_gquotino = gquotino; |
0340d706 | 62 | dest->sb_pquotino = pquotino; |
2bd0ea18 NS |
63 | |
64 | dest->sb_versionnum = versionnum; | |
65 | ||
66 | /* | |
67 | * copy over version bits that are stamped into all | |
68 | * secondaries and cannot be changed at run time in | |
69 | * the primary superblock | |
70 | */ | |
5e656dbb BN |
71 | if (xfs_sb_version_hasdalign(source)) |
72 | dest->sb_versionnum |= XFS_SB_VERSION_DALIGNBIT; | |
73 | if (xfs_sb_version_hasextflgbit(source)) | |
74 | dest->sb_versionnum |= XFS_SB_VERSION_EXTFLGBIT; | |
2bd0ea18 NS |
75 | |
76 | /* | |
77 | * these are all supposed to be zero or will get reset anyway | |
78 | */ | |
79 | dest->sb_icount = 0; | |
80 | dest->sb_ifree = 0; | |
81 | dest->sb_fdblocks = 0; | |
82 | dest->sb_frextents = 0; | |
83 | ||
dab9b8d6 | 84 | memset(source->sb_fname, 0, 12); |
2bd0ea18 NS |
85 | } |
86 | ||
2bd0ea18 NS |
87 | /* |
88 | * find a secondary superblock, copy it into the sb buffer | |
89 | */ | |
90 | int | |
91 | find_secondary_sb(xfs_sb_t *rsb) | |
92 | { | |
93 | xfs_off_t off; | |
94 | xfs_sb_t *sb; | |
95 | xfs_sb_t bufsb; | |
96 | char *c_bufsb; | |
97 | int done; | |
98 | int i; | |
99 | int dirty; | |
100 | int retval; | |
101 | int bsize; | |
102 | ||
507f4e33 | 103 | do_warn(_("\nattempting to find secondary superblock...\n")); |
2bd0ea18 | 104 | |
b74a1f6a | 105 | sb = (xfs_sb_t *)memalign(libxfs_device_alignment(), BSIZE); |
2bd0ea18 NS |
106 | if (!sb) { |
107 | do_error( | |
507f4e33 | 108 | _("error finding secondary superblock -- failed to memalign buffer\n")); |
2bd0ea18 NS |
109 | exit(1); |
110 | } | |
111 | ||
dab9b8d6 | 112 | memset(&bufsb, 0, sizeof(xfs_sb_t)); |
2bd0ea18 NS |
113 | retval = 0; |
114 | dirty = 0; | |
115 | bsize = 0; | |
116 | ||
117 | /* | |
118 | * skip first sector since we know that's bad | |
119 | */ | |
120 | for (done = 0, off = XFS_AG_MIN_BYTES; !done ; off += bsize) { | |
121 | /* | |
122 | * read disk 1 MByte at a time. | |
123 | */ | |
b74a1f6a | 124 | if (lseek64(x.dfd, off, SEEK_SET) != off) { |
2bd0ea18 NS |
125 | done = 1; |
126 | } | |
127 | ||
2e4741ac | 128 | if (!done && (bsize = read(x.dfd, sb, BSIZE)) <= 0) { |
2bd0ea18 NS |
129 | done = 1; |
130 | } | |
131 | ||
132 | do_warn("."); | |
133 | ||
134 | /* | |
135 | * check the buffer 512 bytes at a time since | |
136 | * we don't know how big the sectors really are. | |
137 | */ | |
138 | for (i = 0; !done && i < bsize; i += BBSIZE) { | |
5e656dbb BN |
139 | c_bufsb = (char *)sb + i; |
140 | libxfs_sb_from_disk(&bufsb, (xfs_dsb_t *)c_bufsb); | |
2bd0ea18 NS |
141 | |
142 | if (verify_sb(&bufsb, 0) != XR_OK) | |
143 | continue; | |
144 | ||
507f4e33 | 145 | do_warn(_("found candidate secondary superblock...\n")); |
2bd0ea18 NS |
146 | |
147 | /* | |
148 | * found one. now verify it by looking | |
149 | * for other secondaries. | |
150 | */ | |
dab9b8d6 | 151 | memmove(rsb, &bufsb, sizeof(xfs_sb_t)); |
2bd0ea18 NS |
152 | rsb->sb_inprogress = 0; |
153 | clear_sunit = 1; | |
154 | ||
155 | if (verify_set_primary_sb(rsb, 0, &dirty) == XR_OK) { | |
507f4e33 NS |
156 | do_warn( |
157 | _("verified secondary superblock...\n")); | |
2bd0ea18 NS |
158 | done = 1; |
159 | retval = 1; | |
160 | } else { | |
161 | do_warn( | |
507f4e33 | 162 | _("unable to verify superblock, continuing...\n")); |
2bd0ea18 NS |
163 | } |
164 | } | |
165 | } | |
166 | ||
167 | free(sb); | |
168 | return(retval); | |
169 | } | |
170 | ||
171 | /* | |
172 | * calculate what inode alignment field ought to be | |
173 | * based on internal superblock info | |
174 | */ | |
8b8a6b02 | 175 | static int |
2bd0ea18 NS |
176 | calc_ino_align(xfs_sb_t *sb) |
177 | { | |
178 | xfs_extlen_t align; | |
179 | ||
180 | align = XFS_INODE_BIG_CLUSTER_SIZE >> sb->sb_blocklog; | |
181 | ||
182 | return(align); | |
183 | } | |
184 | ||
185 | /* | |
186 | * verify a superblock -- does not verify root inode # | |
187 | * can only check that geometry info is internally | |
188 | * consistent. because of growfs, that's no guarantee | |
189 | * of correctness (e.g. geometry may have changed) | |
190 | * | |
191 | * fields verified or consistency checked: | |
192 | * | |
193 | * sb_magicnum | |
194 | * | |
195 | * sb_versionnum | |
196 | * | |
197 | * sb_inprogress | |
198 | * | |
199 | * sb_blocksize (as a group) | |
200 | * sb_blocklog | |
201 | * | |
202 | * geometry info - sb_dblocks (as a group) | |
203 | * sb_agcount | |
204 | * sb_agblocks | |
205 | * sb_agblklog | |
206 | * | |
207 | * inode info - sb_inodesize (x-checked with geo info) | |
208 | * sb_inopblock | |
209 | * | |
210 | * sector size info - | |
211 | * sb_sectsize | |
212 | * sb_sectlog | |
3cc4d0db NS |
213 | * sb_logsectsize |
214 | * sb_logsectlog | |
2bd0ea18 NS |
215 | * |
216 | * not checked here - | |
217 | * sb_rootino | |
218 | * sb_fname | |
219 | * sb_fpack | |
220 | * sb_logstart | |
221 | * sb_uuid | |
222 | * | |
223 | * ALL real-time fields | |
224 | * final 4 summary counters | |
225 | */ | |
226 | ||
227 | int | |
228 | verify_sb(xfs_sb_t *sb, int is_primary_sb) | |
229 | { | |
230 | __uint32_t bsize; | |
231 | xfs_extlen_t align; | |
232 | int i; | |
dfc130f3 | 233 | |
2bd0ea18 NS |
234 | /* check magic number and version number */ |
235 | ||
236 | if (sb->sb_magicnum != XFS_SB_MAGIC) | |
237 | return(XR_BAD_MAGIC); | |
238 | ||
5e656dbb | 239 | if (!xfs_sb_good_version(sb)) |
2bd0ea18 NS |
240 | return(XR_BAD_VERSION); |
241 | ||
242 | /* does sb think mkfs really finished ? */ | |
243 | ||
244 | if (is_primary_sb && sb->sb_inprogress == 1) | |
245 | return(XR_BAD_INPROGRESS); | |
246 | ||
247 | /* check to make sure blocksize is legal 2^N, 9 <= N <= 16 */ | |
248 | ||
249 | if (sb->sb_blocksize == 0) | |
250 | return(XR_BAD_BLOCKSIZE); | |
251 | ||
252 | bsize = 1; | |
253 | ||
3cc4d0db NS |
254 | for (i = 0; bsize < sb->sb_blocksize && |
255 | i < sizeof(sb->sb_blocksize) * NBBY; i++) | |
2bd0ea18 | 256 | bsize <<= 1; |
2bd0ea18 | 257 | |
3cc4d0db | 258 | if (i < XFS_MIN_BLOCKSIZE_LOG || i > XFS_MAX_BLOCKSIZE_LOG) |
2bd0ea18 NS |
259 | return(XR_BAD_BLOCKSIZE); |
260 | ||
261 | /* check sb blocksize field against sb blocklog field */ | |
262 | ||
263 | if (i != sb->sb_blocklog) | |
264 | return(XR_BAD_BLOCKLOG); | |
265 | ||
266 | /* sanity check ag count, size fields against data size field */ | |
267 | ||
268 | if (sb->sb_dblocks == 0 || | |
3cc4d0db | 269 | sb->sb_dblocks > |
601e7662 | 270 | ((__uint64_t)sb->sb_agcount * sb->sb_agblocks) || |
3cc4d0db | 271 | sb->sb_dblocks < |
601e7662 | 272 | ((__uint64_t)(sb->sb_agcount - 1) * sb->sb_agblocks |
3cc4d0db | 273 | + XFS_MIN_AG_BLOCKS)) |
2bd0ea18 NS |
274 | return(XR_BAD_FS_SIZE_DATA); |
275 | ||
276 | if (sb->sb_agblklog != (__uint8_t)libxfs_log2_roundup(sb->sb_agblocks)) | |
277 | return(XR_BAD_FS_SIZE_DATA); | |
278 | ||
279 | if (sb->sb_inodesize < XFS_DINODE_MIN_SIZE || | |
280 | sb->sb_inodesize > XFS_DINODE_MAX_SIZE || | |
281 | sb->sb_inopblock != howmany(sb->sb_blocksize,sb->sb_inodesize)) | |
282 | return(XR_BAD_INO_SIZE_DATA); | |
283 | ||
3cc4d0db NS |
284 | /* check to make sure sectorsize is legal 2^N, 9 <= N <= 15 */ |
285 | ||
286 | if (sb->sb_sectsize == 0) | |
287 | return(XR_BAD_SECT_SIZE_DATA); | |
2bd0ea18 NS |
288 | |
289 | bsize = 1; | |
290 | ||
3cc4d0db NS |
291 | for (i = 0; bsize < sb->sb_sectsize && |
292 | i < sizeof(sb->sb_sectsize) * NBBY; i++) { | |
2bd0ea18 NS |
293 | bsize <<= 1; |
294 | } | |
295 | ||
3cc4d0db NS |
296 | if (i < XFS_MIN_SECTORSIZE_LOG || i > XFS_MAX_SECTORSIZE_LOG) |
297 | return(XR_BAD_SECT_SIZE_DATA); | |
298 | ||
299 | /* check sb sectorsize field against sb sectlog field */ | |
300 | ||
301 | if (i != sb->sb_sectlog) | |
2bd0ea18 NS |
302 | return(XR_BAD_SECT_SIZE_DATA); |
303 | ||
5e656dbb | 304 | if (xfs_sb_version_hassector(sb)) { |
3cc4d0db NS |
305 | |
306 | /* check to make sure log sector is legal 2^N, 9 <= N <= 15 */ | |
307 | ||
308 | if (sb->sb_logsectsize == 0) | |
309 | return(XR_BAD_SECT_SIZE_DATA); | |
310 | ||
311 | bsize = 1; | |
312 | ||
313 | for (i = 0; bsize < sb->sb_logsectsize && | |
314 | i < sizeof(sb->sb_logsectsize) * NBBY; i++) { | |
315 | bsize <<= 1; | |
316 | } | |
317 | ||
318 | if (i < XFS_MIN_SECTORSIZE_LOG || i > XFS_MAX_SECTORSIZE_LOG) | |
319 | return(XR_BAD_SECT_SIZE_DATA); | |
320 | ||
321 | /* check sb log sectorsize field against sb log sectlog field */ | |
322 | ||
323 | if (i != sb->sb_logsectlog) | |
324 | return(XR_BAD_SECT_SIZE_DATA); | |
325 | } | |
326 | ||
2bd0ea18 NS |
327 | /* |
328 | * real-time extent size is always set | |
329 | */ | |
330 | if (sb->sb_rextsize * sb->sb_blocksize > XFS_MAX_RTEXTSIZE) | |
331 | return(XR_BAD_RT_GEO_DATA); | |
332 | ||
333 | if (sb->sb_rextsize * sb->sb_blocksize < XFS_MIN_RTEXTSIZE) | |
334 | return(XR_BAD_RT_GEO_DATA); | |
335 | ||
336 | if (sb->sb_rblocks == 0) { | |
337 | if (sb->sb_rextents != 0) | |
338 | return(XR_BAD_RT_GEO_DATA); | |
339 | ||
340 | if (sb->sb_rbmblocks != 0) | |
341 | return(XR_BAD_RT_GEO_DATA); | |
342 | ||
343 | if (sb->sb_rextslog != 0) | |
344 | return(XR_BAD_RT_GEO_DATA); | |
345 | ||
346 | if (sb->sb_frextents != 0) | |
347 | return(XR_BAD_RT_GEO_DATA); | |
348 | } else { | |
349 | /* | |
350 | * if we have a real-time partition, sanity-check geometry | |
351 | */ | |
352 | if (sb->sb_rblocks / sb->sb_rextsize != sb->sb_rextents) | |
353 | return(XR_BAD_RT_GEO_DATA); | |
354 | ||
355 | if (sb->sb_rextslog != | |
356 | libxfs_highbit32((unsigned int)sb->sb_rextents)) | |
357 | return(XR_BAD_RT_GEO_DATA); | |
358 | ||
359 | if (sb->sb_rbmblocks != (xfs_extlen_t) howmany(sb->sb_rextents, | |
360 | NBBY * sb->sb_blocksize)) | |
361 | return(XR_BAD_RT_GEO_DATA); | |
362 | } | |
363 | ||
364 | /* | |
365 | * verify correctness of inode alignment if it's there | |
366 | */ | |
5e656dbb | 367 | if (xfs_sb_version_hasalign(sb)) { |
2bd0ea18 NS |
368 | align = calc_ino_align(sb); |
369 | ||
370 | if (align != sb->sb_inoalignmt) | |
371 | return(XR_BAD_INO_ALIGN); | |
372 | } | |
373 | ||
374 | /* | |
375 | * verify max. % of inodes (sb_imax_pct) | |
376 | */ | |
377 | if (sb->sb_imax_pct > 100) | |
378 | return(XR_BAD_INO_MAX_PCT); | |
379 | ||
380 | /* | |
381 | * verify stripe alignment fields if present | |
382 | */ | |
5e656dbb | 383 | if (xfs_sb_version_hasdalign(sb)) { |
dfc130f3 RC |
384 | if ((!sb->sb_unit && sb->sb_width) || |
385 | (sb->sb_unit && sb->sb_agblocks % sb->sb_unit)) | |
2bd0ea18 NS |
386 | return(XR_BAD_SB_UNIT); |
387 | if ((sb->sb_unit && !sb->sb_width) || | |
388 | (sb->sb_width && sb->sb_unit && sb->sb_width % sb->sb_unit)) | |
389 | return(XR_BAD_SB_WIDTH); | |
390 | } | |
391 | ||
392 | /* | |
393 | * if shared bit is set, verify that the version number is sane | |
394 | */ | |
5e656dbb | 395 | if (xfs_sb_version_hasshared(sb)) { |
2bd0ea18 NS |
396 | if (sb->sb_shared_vn > XFS_SB_MAX_SHARED_VN) |
397 | return(XR_BAD_SVN); | |
398 | } | |
399 | ||
400 | /* | |
401 | * mkfs's that stamped a feature bit besides the ones in the | |
402 | * mask below could leave garbage in the secondary superblock | |
403 | * sectors. Anything stamping the shared fs bit or better into | |
404 | * the secondaries is ok and should generate clean secondary | |
405 | * superblock sectors. | |
406 | * | |
407 | * check primary and clean secondary superblocks more strictly | |
408 | */ | |
409 | if (is_primary_sb || sb->sb_versionnum & XR_PART_SECSB_VNMASK) { | |
410 | /* | |
411 | * return errors if shared vn or alignment fields | |
412 | * are set without their feature bits being set | |
413 | */ | |
27527004 NS |
414 | if ((!pre_65_beta && (sb->sb_versionnum & XR_PART_SECSB_VNMASK)) || |
415 | (pre_65_beta && (sb->sb_versionnum & XR_ALPHA_SECSB_VNMASK))) { | |
2bd0ea18 NS |
416 | /* |
417 | * shared version # and inode alignment fields | |
418 | * should be valid | |
419 | */ | |
5e656dbb | 420 | if (sb->sb_shared_vn && !xfs_sb_version_hasshared(sb)) |
2bd0ea18 | 421 | return(XR_BAD_SVN); |
5e656dbb | 422 | if (sb->sb_inoalignmt && !xfs_sb_version_hasalign(sb)) |
2bd0ea18 NS |
423 | return(XR_BAD_INO_ALIGN); |
424 | } | |
425 | if ((!pre_65_beta && | |
426 | (sb->sb_versionnum & XR_GOOD_SECSB_VNMASK)) || | |
427 | (pre_65_beta && | |
428 | (sb->sb_versionnum & XFS_SB_VERSION_DALIGNBIT))) { | |
429 | /* | |
430 | * stripe alignment values should be valid | |
431 | */ | |
5e656dbb | 432 | if (sb->sb_unit && !xfs_sb_version_hasdalign(sb)) |
2bd0ea18 | 433 | return(XR_BAD_SB_UNIT); |
5e656dbb | 434 | if (sb->sb_width && !xfs_sb_version_hasdalign(sb)) |
2bd0ea18 NS |
435 | return(XR_BAD_SB_WIDTH); |
436 | } | |
437 | ||
438 | #if 0 | |
439 | /* | |
440 | * checks involving later superblock fields get added here... | |
441 | */ | |
442 | if (sb->sb_versionnum & XR_GOOD_SECSB_VNMASK) { | |
443 | } | |
444 | #endif | |
445 | } | |
446 | ||
447 | return(XR_OK); | |
448 | } | |
449 | ||
450 | void | |
451 | write_primary_sb(xfs_sb_t *sbp, int size) | |
452 | { | |
5e656dbb | 453 | xfs_dsb_t *buf; |
dfc130f3 | 454 | |
2bd0ea18 NS |
455 | if (no_modify) |
456 | return; | |
dfc130f3 | 457 | |
5e656dbb BN |
458 | buf = memalign(libxfs_device_alignment(), size); |
459 | if (buf == NULL) { | |
b74a1f6a | 460 | do_error(_("failed to memalign superblock buffer\n")); |
dfc130f3 | 461 | return; |
2bd0ea18 | 462 | } |
b74a1f6a | 463 | memset(buf, 0, size); |
2bd0ea18 | 464 | |
b74a1f6a | 465 | if (lseek64(x.dfd, 0LL, SEEK_SET) != 0LL) { |
dfc130f3 | 466 | free(buf); |
507f4e33 | 467 | do_error(_("couldn't seek to offset 0 in filesystem\n")); |
dfc130f3 RC |
468 | } |
469 | ||
5e656dbb BN |
470 | |
471 | libxfs_sb_to_disk(buf, sbp, XFS_SB_ALL_BITS); | |
2bd0ea18 | 472 | |
b74a1f6a | 473 | if (write(x.dfd, buf, size) != size) { |
dfc130f3 | 474 | free(buf); |
507f4e33 | 475 | do_error(_("primary superblock write failed!\n")); |
dfc130f3 | 476 | } |
2bd0ea18 | 477 | |
dfc130f3 | 478 | free(buf); |
2bd0ea18 NS |
479 | } |
480 | ||
481 | /* | |
482 | * get a possible superblock -- don't check for internal consistency | |
483 | */ | |
484 | int | |
485 | get_sb(xfs_sb_t *sbp, xfs_off_t off, int size, xfs_agnumber_t agno) | |
486 | { | |
487 | int error, rval; | |
5e656dbb | 488 | xfs_dsb_t *buf; |
dfc130f3 | 489 | |
5e656dbb BN |
490 | buf = memalign(libxfs_device_alignment(), size); |
491 | if (buf == NULL) { | |
2bd0ea18 | 492 | do_error( |
b74a1f6a | 493 | _("error reading superblock %u -- failed to memalign buffer\n"), |
5d1b7f0f | 494 | agno); |
2bd0ea18 NS |
495 | exit(1); |
496 | } | |
b74a1f6a | 497 | memset(buf, 0, size); |
2bd0ea18 NS |
498 | |
499 | /* try and read it first */ | |
500 | ||
b74a1f6a | 501 | if (lseek64(x.dfd, off, SEEK_SET) != off) { |
2bd0ea18 | 502 | do_warn( |
5d1b7f0f | 503 | _("error reading superblock %u -- seek to offset %" PRId64 " failed\n"), |
2bd0ea18 | 504 | agno, off); |
70ee4153 | 505 | free(buf); |
2bd0ea18 NS |
506 | return(XR_EOF); |
507 | } | |
508 | ||
b74a1f6a | 509 | if ((rval = read(x.dfd, buf, size)) != size) { |
2bd0ea18 NS |
510 | error = errno; |
511 | do_warn( | |
5d1b7f0f | 512 | _("superblock read failed, offset %" PRId64 ", size %d, ag %u, rval %d\n"), |
b74a1f6a | 513 | off, size, agno, rval); |
2bd0ea18 NS |
514 | do_error("%s\n", strerror(error)); |
515 | } | |
5e656dbb | 516 | libxfs_sb_from_disk(sbp, buf); |
2bd0ea18 NS |
517 | free(buf); |
518 | ||
519 | return (verify_sb(sbp, 0)); | |
520 | } | |
521 | ||
2bd0ea18 | 522 | /* returns element on list with highest reference count */ |
8b8a6b02 | 523 | static fs_geo_list_t * |
2bd0ea18 NS |
524 | get_best_geo(fs_geo_list_t *list) |
525 | { | |
526 | int cnt = 0; | |
527 | fs_geo_list_t *current, *rval = NULL; | |
528 | ||
529 | current = list; | |
530 | ||
531 | while (current != NULL) { | |
532 | if (current->refs > cnt) { | |
533 | rval = current; | |
534 | cnt = current->refs; | |
535 | } | |
536 | current = current->next; | |
537 | } | |
538 | ||
539 | return(rval); | |
540 | } | |
541 | ||
542 | /* adds geometry info to linked list. returns (sometimes new) head of list */ | |
8b8a6b02 | 543 | static fs_geo_list_t * |
2bd0ea18 NS |
544 | add_geo(fs_geo_list_t *list, fs_geometry_t *geo_p, int index) |
545 | { | |
546 | fs_geo_list_t *current = list; | |
dfc130f3 | 547 | |
2bd0ea18 NS |
548 | while (current != NULL) { |
549 | if (memcmp(geo_p, ¤t->geo, sizeof(fs_geometry_t)) == 0) { | |
550 | current->refs++; | |
551 | return(list); | |
552 | } | |
553 | ||
554 | current = current->next; | |
555 | } | |
556 | ||
557 | if ((current = malloc(sizeof(fs_geo_list_t))) == NULL) { | |
507f4e33 | 558 | do_error(_("couldn't malloc geometry structure\n")); |
2bd0ea18 NS |
559 | exit(1); |
560 | } | |
561 | ||
562 | current->geo = *geo_p; | |
563 | current->refs = 1; | |
564 | current->next = list; | |
565 | current->index = index; | |
566 | ||
567 | return(current); | |
568 | } | |
569 | ||
8b8a6b02 | 570 | static void |
2bd0ea18 NS |
571 | free_geo(fs_geo_list_t *list) |
572 | { | |
573 | fs_geo_list_t *next; | |
574 | fs_geo_list_t *current; | |
575 | ||
576 | current = list; | |
577 | ||
578 | for (current = list; current != NULL; current = next) { | |
579 | next = current->next; | |
580 | free(current); | |
581 | } | |
582 | } | |
583 | ||
584 | void | |
585 | get_sb_geometry(fs_geometry_t *geo, xfs_sb_t *sbp) | |
586 | { | |
dab9b8d6 | 587 | memset(geo, 0, sizeof(fs_geometry_t)); |
2bd0ea18 NS |
588 | |
589 | /* | |
590 | * blindly set fields that we know are always good | |
591 | */ | |
592 | geo->sb_blocksize = sbp->sb_blocksize; | |
593 | geo->sb_dblocks = sbp->sb_dblocks; | |
594 | geo->sb_rblocks = sbp->sb_rblocks; | |
595 | geo->sb_rextents = sbp->sb_rextents; | |
596 | geo->sb_logstart = sbp->sb_logstart; | |
597 | geo->sb_rextsize = sbp->sb_rextsize; | |
598 | geo->sb_agblocks = sbp->sb_agblocks; | |
599 | geo->sb_agcount = sbp->sb_agcount; | |
600 | geo->sb_rbmblocks = sbp->sb_rbmblocks; | |
601 | geo->sb_logblocks = sbp->sb_logblocks; | |
602 | geo->sb_sectsize = sbp->sb_sectsize; | |
603 | geo->sb_inodesize = sbp->sb_inodesize; | |
604 | ||
5e656dbb | 605 | if (xfs_sb_version_hasalign(sbp)) |
2bd0ea18 NS |
606 | geo->sb_ialignbit = 1; |
607 | ||
5e656dbb | 608 | if (xfs_sb_version_hasshared(sbp) || |
2bd0ea18 NS |
609 | sbp->sb_versionnum & XR_PART_SECSB_VNMASK) |
610 | geo->sb_sharedbit = 1; | |
611 | ||
5e656dbb | 612 | if (xfs_sb_version_hasdalign(sbp)) |
2bd0ea18 NS |
613 | geo->sb_salignbit = 1; |
614 | ||
5e656dbb | 615 | if (xfs_sb_version_hasextflgbit(sbp)) |
2bd0ea18 NS |
616 | geo->sb_extflgbit = 1; |
617 | ||
618 | /* | |
619 | * protect against pre-6.5 mkfs-generated garbaged | |
620 | * fields in the secondary superblocks. pay attention | |
621 | * to those fields if and only if their corresponding | |
622 | * feature bits are set in the feature bits of the | |
623 | * version number or we can deduce from the version bits | |
624 | * that are set that our field was properly initialized | |
625 | * because a field after the field we care about was | |
626 | * properly initialized as well. | |
627 | */ | |
628 | ||
629 | /* | |
630 | * inode alignment field lives before the data alignment field | |
631 | */ | |
27527004 NS |
632 | if ((!pre_65_beta && (sbp->sb_versionnum & XR_PART_SECSB_VNMASK)) || |
633 | (pre_65_beta && (sbp->sb_versionnum & XR_ALPHA_SECSB_VNMASK))) | |
2bd0ea18 NS |
634 | geo->sb_inoalignmt = sbp->sb_inoalignmt; |
635 | ||
27527004 | 636 | if ((!pre_65_beta && (sbp->sb_versionnum & XR_GOOD_SECSB_VNMASK)) || |
5e656dbb | 637 | (pre_65_beta && xfs_sb_version_hasdalign(sbp))) { |
2bd0ea18 NS |
638 | geo->sb_unit = sbp->sb_unit; |
639 | geo->sb_width = sbp->sb_width; | |
640 | } | |
641 | ||
642 | /* | |
643 | * shared vn always set if either ino or data alignment is on | |
644 | * since that field lives between the quota and inode alignment | |
645 | * fields | |
646 | */ | |
647 | if (sbp->sb_versionnum & XR_PART_SECSB_VNMASK) | |
648 | geo->sb_shared_vn = sbp->sb_shared_vn; | |
649 | ||
650 | /* | |
651 | * superblock fields located after sb_widthfields get set | |
652 | * into the geometry structure only if we can determine | |
653 | * from the features enabled in this superblock whether | |
dab9b8d6 | 654 | * or not the sector was zero'd at mkfs time. |
2bd0ea18 | 655 | */ |
27527004 NS |
656 | if ((!pre_65_beta && (sbp->sb_versionnum & XR_GOOD_SECSB_VNMASK)) || |
657 | (pre_65_beta && (sbp->sb_versionnum & XR_ALPHA_SECSB_VNMASK))) { | |
2bd0ea18 NS |
658 | geo->sb_fully_zeroed = 1; |
659 | } | |
660 | } | |
661 | ||
662 | /* | |
663 | * the way to verify that a primary sb is consistent with the | |
664 | * filesystem is find the secondaries given the info in the | |
665 | * primary and compare the geometries in the secondaries against | |
666 | * the geometry indicated by the primary. | |
667 | * | |
668 | * returns 1 if bad, 0 if ok | |
669 | */ | |
670 | int | |
671 | verify_set_primary_sb(xfs_sb_t *rsb, | |
672 | int sb_index, | |
673 | int *sb_modified) | |
674 | { | |
507f4e33 | 675 | xfs_off_t off; |
2bd0ea18 NS |
676 | fs_geometry_t geo; |
677 | xfs_sb_t *sb; | |
678 | fs_geo_list_t *list; | |
679 | fs_geo_list_t *current; | |
680 | char *checked; | |
681 | xfs_agnumber_t agno; | |
682 | int num_sbs; | |
683 | int skip; | |
684 | int size; | |
685 | int num_ok; | |
686 | int retval; | |
687 | int round; | |
688 | ||
689 | /* | |
690 | * select the number of secondaries to try for | |
691 | */ | |
692 | num_sbs = MIN(NUM_SBS, rsb->sb_agcount); | |
693 | skip = howmany(num_sbs, rsb->sb_agcount); | |
f63fd268 DC |
694 | |
695 | /* | |
696 | * We haven't been able to validate the sector size yet properly | |
697 | * (e.g. in the case of repairing an image in a file), so we need to | |
698 | * take into account sector mismatches and so use the maximum possible | |
699 | * sector size rather than the sector size in @rsb. | |
700 | */ | |
701 | size = NUM_AGH_SECTS * (1 << (XFS_MAX_SECTORSIZE_LOG)); | |
2bd0ea18 NS |
702 | retval = 0; |
703 | list = NULL; | |
704 | num_ok = 0; | |
705 | *sb_modified = 0; | |
706 | ||
707 | sb = (xfs_sb_t *) alloc_ag_buf(size); | |
708 | checked = calloc(rsb->sb_agcount, sizeof(char)); | |
709 | if (!checked) { | |
507f4e33 | 710 | do_error(_("calloc failed in verify_set_primary_sb\n")); |
2bd0ea18 NS |
711 | exit(1); |
712 | } | |
713 | ||
714 | /* | |
715 | * put the primary sb geometry info onto the geometry list | |
716 | */ | |
717 | checked[sb_index] = 1; | |
718 | get_sb_geometry(&geo, rsb); | |
719 | list = add_geo(list, &geo, sb_index); | |
720 | ||
721 | /* | |
722 | * grab N secondaries. check them off as we get them | |
723 | * so we only process each one once | |
724 | */ | |
725 | for (round = 0; round < skip; round++) { | |
726 | for (agno = round; agno < rsb->sb_agcount; agno += skip) { | |
727 | if (checked[agno]) | |
728 | continue; | |
729 | ||
730 | off = (xfs_off_t)agno * rsb->sb_agblocks << rsb->sb_blocklog; | |
731 | ||
732 | checked[agno] = 1; | |
733 | ||
734 | if (get_sb(sb, off, size, agno) == XR_EOF) { | |
735 | retval = 1; | |
736 | goto out; | |
737 | } | |
738 | ||
739 | if (verify_sb(sb, 0) == XR_OK) { | |
740 | /* | |
741 | * save away geometry info. | |
742 | * don't bother checking the sb | |
743 | * against the agi/agf as the odds | |
744 | * of the sb being corrupted in a way | |
745 | * that it is internally consistent | |
746 | * but not consistent with the rest | |
747 | * of the filesystem is really really low. | |
748 | */ | |
749 | get_sb_geometry(&geo, sb); | |
750 | list = add_geo(list, &geo, agno); | |
751 | num_ok++; | |
752 | } | |
753 | } | |
754 | } | |
755 | ||
756 | /* | |
757 | * see if we have enough superblocks to bother with | |
758 | */ | |
759 | if (num_ok < num_sbs / 2) | |
760 | return(XR_INSUFF_SEC_SB); | |
761 | ||
762 | current = get_best_geo(list); | |
763 | ||
764 | /* | |
765 | * check that enough sbs agree that we're willing to | |
766 | * go with this geometry. if not, print out the | |
767 | * geometry and a message about the force option. | |
768 | */ | |
769 | switch (num_sbs) { | |
770 | case 2: | |
771 | /* | |
d4dd6ab5 CH |
772 | * If we only have two allocation groups, and the superblock |
773 | * in the second allocation group differs from the primary | |
774 | * superblock we can't verify the geometry information. | |
775 | * Warn the user about this situation and get out unless | |
776 | * explicitly overridden. | |
2bd0ea18 NS |
777 | */ |
778 | if (current->refs != 2) { | |
779 | if (!force_geo) { | |
507f4e33 | 780 | do_warn( |
d4dd6ab5 CH |
781 | _("Only two AGs detected and they do not match - " |
782 | "cannot validate filesystem geometry.\n" | |
783 | "Use the -o force_geometry option to proceed.\n")); | |
2bd0ea18 NS |
784 | exit(1); |
785 | } | |
786 | } | |
d4dd6ab5 | 787 | goto out_free_list; |
2bd0ea18 NS |
788 | case 1: |
789 | /* | |
d4dd6ab5 CH |
790 | * If we only have a single allocation group there is no |
791 | * secondary superblock that we can use to verify the geometry | |
792 | * information. Warn the user about this situation and get | |
793 | * out unless explicitly overridden. | |
2bd0ea18 NS |
794 | */ |
795 | if (!force_geo) { | |
d4dd6ab5 CH |
796 | do_warn( |
797 | _("Only one AG detected - " | |
798 | "cannot validate filesystem geometry.\n" | |
799 | "Use the -o force_geometry option to proceed.\n")); | |
2bd0ea18 NS |
800 | exit(1); |
801 | } | |
d4dd6ab5 | 802 | goto out_free_list; |
2bd0ea18 NS |
803 | default: |
804 | /* | |
805 | * at least half of the probed superblocks have | |
806 | * to agree. if they don't, this fs is probably | |
807 | * too far gone anyway considering the fact that | |
808 | * XFS normally doesn't alter the secondary superblocks. | |
809 | */ | |
810 | if (current->refs < num_sbs / 2) { | |
507f4e33 NS |
811 | do_warn( |
812 | _("Not enough matching superblocks - cannot proceed.\n")); | |
2bd0ea18 NS |
813 | exit(1); |
814 | } | |
815 | } | |
816 | ||
817 | /* | |
818 | * set the geometry into primary superblock if necessary. | |
819 | */ | |
820 | ||
821 | if (current->index != sb_index) { | |
822 | *sb_modified = 1; | |
41f361f8 | 823 | off = (xfs_off_t)current->index * current->geo.sb_agblocks |
2bd0ea18 NS |
824 | * current->geo.sb_blocksize; |
825 | if (get_sb(sb, off, current->geo.sb_sectsize, | |
826 | current->index) != XR_OK) | |
507f4e33 | 827 | do_error(_("could not read superblock\n")); |
2bd0ea18 NS |
828 | |
829 | copy_sb(sb, rsb); | |
830 | ||
831 | /* | |
832 | * turn off inprogress bit since this is the primary. | |
833 | * also save away values that we need to ensure are | |
834 | * consistent in the other secondaries. | |
835 | */ | |
836 | rsb->sb_inprogress = 0; | |
837 | sb_inoalignmt = sb->sb_inoalignmt; | |
838 | sb_unit = sb->sb_unit; | |
839 | sb_width = sb->sb_width; | |
840 | } | |
841 | ||
d4dd6ab5 | 842 | out_free_list: |
2bd0ea18 NS |
843 | free_geo(list); |
844 | out: | |
845 | free(sb); | |
846 | free(checked); | |
847 | return(retval); | |
848 | } |