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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 | 17 | */ |
24f4f998 | 18 | #include "libfrog.h" |
6b803e5a | 19 | #include "libxfs.h" |
1b1b5359 | 20 | #include "libxcmd.h" |
6b803e5a | 21 | #include "libxlog.h" |
2bd0ea18 NS |
22 | #include "agheader.h" |
23 | #include "globals.h" | |
24 | #include "protos.h" | |
25 | #include "err_protos.h" | |
ef12e076 | 26 | #include "xfs_multidisk.h" |
2bd0ea18 | 27 | |
92217f0c NS |
28 | #define BSIZE (1024 * 1024) |
29 | ||
2bd0ea18 NS |
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 | */ | |
8b8a6b02 | 34 | static void |
2bd0ea18 NS |
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; | |
b36eef04 | 41 | xfs_ino_t gquotino; |
0340d706 | 42 | xfs_ino_t pquotino; |
14f8b681 | 43 | uint16_t versionnum; |
2bd0ea18 NS |
44 | |
45 | rootino = dest->sb_rootino; | |
46 | rbmino = dest->sb_rbmino; | |
47 | rsumino = dest->sb_rsumino; | |
48 | uquotino = dest->sb_uquotino; | |
b36eef04 | 49 | gquotino = dest->sb_gquotino; |
0340d706 | 50 | pquotino = dest->sb_pquotino; |
2bd0ea18 NS |
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; | |
b36eef04 | 60 | dest->sb_gquotino = gquotino; |
0340d706 | 61 | dest->sb_pquotino = pquotino; |
2bd0ea18 NS |
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 | */ | |
5e656dbb BN |
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; | |
2bd0ea18 NS |
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 | ||
dab9b8d6 | 83 | memset(source->sb_fname, 0, 12); |
2bd0ea18 NS |
84 | } |
85 | ||
ef12e076 BD |
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; | |
ef12e076 BD |
92 | if (sb->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG || |
93 | sb->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG) | |
94 | return XR_BAD_BLOCKLOG; | |
25f9772a DW |
95 | if (sb->sb_blocksize != (1 << sb->sb_blocklog)) |
96 | return XR_BAD_BLOCKLOG; | |
ef12e076 BD |
97 | |
98 | return 0; | |
99 | } | |
100 | ||
2bd0ea18 | 101 | /* |
1b1b5359 BD |
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. | |
2bd0ea18 | 105 | */ |
1b1b5359 BD |
106 | static int |
107 | __find_secondary_sb( | |
108 | xfs_sb_t *rsb, | |
14f8b681 DW |
109 | uint64_t start, |
110 | uint64_t skip) | |
2bd0ea18 NS |
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 | ||
b74a1f6a | 122 | sb = (xfs_sb_t *)memalign(libxfs_device_alignment(), BSIZE); |
2bd0ea18 NS |
123 | if (!sb) { |
124 | do_error( | |
507f4e33 | 125 | _("error finding secondary superblock -- failed to memalign buffer\n")); |
2bd0ea18 NS |
126 | exit(1); |
127 | } | |
128 | ||
dab9b8d6 | 129 | memset(&bufsb, 0, sizeof(xfs_sb_t)); |
2bd0ea18 NS |
130 | retval = 0; |
131 | dirty = 0; | |
132 | bsize = 0; | |
133 | ||
134 | /* | |
135 | * skip first sector since we know that's bad | |
136 | */ | |
1b1b5359 | 137 | for (done = 0, off = start; !done ; off += skip) { |
2bd0ea18 NS |
138 | /* |
139 | * read disk 1 MByte at a time. | |
140 | */ | |
dc8878f4 | 141 | if (lseek(x.dfd, off, SEEK_SET) != off) { |
2bd0ea18 NS |
142 | done = 1; |
143 | } | |
144 | ||
2e4741ac | 145 | if (!done && (bsize = read(x.dfd, sb, BSIZE)) <= 0) { |
2bd0ea18 NS |
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) { | |
5e656dbb BN |
156 | c_bufsb = (char *)sb + i; |
157 | libxfs_sb_from_disk(&bufsb, (xfs_dsb_t *)c_bufsb); | |
2bd0ea18 | 158 | |
88f364a9 | 159 | if (verify_sb(c_bufsb, &bufsb, 0) != XR_OK) |
2bd0ea18 NS |
160 | continue; |
161 | ||
507f4e33 | 162 | do_warn(_("found candidate secondary superblock...\n")); |
2bd0ea18 NS |
163 | |
164 | /* | |
165 | * found one. now verify it by looking | |
166 | * for other secondaries. | |
167 | */ | |
dab9b8d6 | 168 | memmove(rsb, &bufsb, sizeof(xfs_sb_t)); |
2bd0ea18 | 169 | rsb->sb_inprogress = 0; |
6bf4721d | 170 | copied_sunit = 1; |
2bd0ea18 NS |
171 | |
172 | if (verify_set_primary_sb(rsb, 0, &dirty) == XR_OK) { | |
507f4e33 NS |
173 | do_warn( |
174 | _("verified secondary superblock...\n")); | |
2bd0ea18 NS |
175 | done = 1; |
176 | retval = 1; | |
177 | } else { | |
178 | do_warn( | |
507f4e33 | 179 | _("unable to verify superblock, continuing...\n")); |
2bd0ea18 NS |
180 | } |
181 | } | |
182 | } | |
183 | ||
184 | free(sb); | |
1b1b5359 BD |
185 | return retval; |
186 | } | |
187 | ||
188 | static int | |
189 | guess_default_geometry( | |
14f8b681 DW |
190 | uint64_t *agsize, |
191 | uint64_t *agcount, | |
1b1b5359 BD |
192 | libxfs_init_t *x) |
193 | { | |
194 | struct fs_topology ft; | |
195 | int blocklog; | |
14f8b681 | 196 | uint64_t dblocks; |
1b1b5359 BD |
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 | { | |
ef12e076 | 218 | int retval = 0; |
14f8b681 DW |
219 | uint64_t agcount; |
220 | uint64_t agsize; | |
221 | uint64_t skip; | |
1b1b5359 BD |
222 | int blocklog; |
223 | ||
224 | /* | |
ef12e076 BD |
225 | * Attempt to find secondary sb with a coarse approach, |
226 | * first trying agblocks and blocksize read from sb, providing | |
227 | * they're sane. | |
1b1b5359 | 228 | */ |
ef12e076 | 229 | do_warn(_("\nattempting to find secondary superblock...\n")); |
1b1b5359 | 230 | |
ef12e076 | 231 | if (verify_sb_blocksize(rsb) == 0) { |
14f8b681 | 232 | skip = (uint64_t)rsb->sb_agblocks * rsb->sb_blocksize; |
ef12e076 BD |
233 | if (skip >= XFS_AG_MIN_BYTES && skip <= XFS_AG_MAX_BYTES) |
234 | retval = __find_secondary_sb(rsb, skip, skip); | |
1b1b5359 | 235 | } |
ef12e076 BD |
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 | ||
1b1b5359 | 248 | return retval; |
2bd0ea18 NS |
249 | } |
250 | ||
251 | /* | |
90c9ac9d BF |
252 | * Calculate what the inode alignment field ought to be based on internal |
253 | * superblock info and determine if it is valid. | |
7b5f9801 | 254 | * |
90c9ac9d BF |
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. | |
7b5f9801 DC |
259 | * |
260 | * Return true if the alignment is valid, false otherwise. | |
2bd0ea18 | 261 | */ |
7b5f9801 DC |
262 | static bool |
263 | sb_validate_ino_align(struct xfs_sb *sb) | |
2bd0ea18 | 264 | { |
7b5f9801 | 265 | xfs_extlen_t align; |
2bd0ea18 | 266 | |
7b5f9801 DC |
267 | if (!xfs_sb_version_hasalign(sb)) |
268 | return true; | |
269 | ||
270 | /* standard cluster size alignment is always valid */ | |
2bd0ea18 | 271 | align = XFS_INODE_BIG_CLUSTER_SIZE >> sb->sb_blocklog; |
7b5f9801 DC |
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; | |
2bd0ea18 | 278 | |
16e16276 BF |
279 | align = (XFS_INODE_BIG_CLUSTER_SIZE * |
280 | sb->sb_inodesize / XFS_DINODE_MIN_SIZE) >> sb->sb_blocklog; | |
7b5f9801 DC |
281 | if (align == sb->sb_inoalignmt) |
282 | return true; | |
283 | ||
90c9ac9d BF |
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 | ||
7b5f9801 | 298 | return false; |
2bd0ea18 NS |
299 | } |
300 | ||
301 | /* | |
302 | * verify a superblock -- does not verify root inode # | |
303 | * can only check that geometry info is internally | |
304 | * consistent. because of growfs, that's no guarantee | |
305 | * of correctness (e.g. geometry may have changed) | |
306 | * | |
307 | * fields verified or consistency checked: | |
308 | * | |
309 | * sb_magicnum | |
310 | * | |
311 | * sb_versionnum | |
312 | * | |
313 | * sb_inprogress | |
314 | * | |
315 | * sb_blocksize (as a group) | |
316 | * sb_blocklog | |
317 | * | |
318 | * geometry info - sb_dblocks (as a group) | |
319 | * sb_agcount | |
320 | * sb_agblocks | |
321 | * sb_agblklog | |
322 | * | |
323 | * inode info - sb_inodesize (x-checked with geo info) | |
324 | * sb_inopblock | |
325 | * | |
326 | * sector size info - | |
327 | * sb_sectsize | |
328 | * sb_sectlog | |
3cc4d0db NS |
329 | * sb_logsectsize |
330 | * sb_logsectlog | |
2bd0ea18 NS |
331 | * |
332 | * not checked here - | |
333 | * sb_rootino | |
334 | * sb_fname | |
335 | * sb_fpack | |
336 | * sb_logstart | |
337 | * sb_uuid | |
338 | * | |
339 | * ALL real-time fields | |
340 | * final 4 summary counters | |
341 | */ | |
342 | ||
343 | int | |
88f364a9 | 344 | verify_sb(char *sb_buf, xfs_sb_t *sb, int is_primary_sb) |
2bd0ea18 | 345 | { |
14f8b681 | 346 | uint32_t bsize; |
2bd0ea18 | 347 | int i; |
ef12e076 | 348 | int ret; |
dfc130f3 | 349 | |
2bd0ea18 NS |
350 | /* check magic number and version number */ |
351 | ||
352 | if (sb->sb_magicnum != XFS_SB_MAGIC) | |
353 | return(XR_BAD_MAGIC); | |
354 | ||
5e656dbb | 355 | if (!xfs_sb_good_version(sb)) |
2bd0ea18 NS |
356 | return(XR_BAD_VERSION); |
357 | ||
358 | /* does sb think mkfs really finished ? */ | |
359 | ||
360 | if (is_primary_sb && sb->sb_inprogress == 1) | |
361 | return(XR_BAD_INPROGRESS); | |
362 | ||
88f364a9 DC |
363 | /* |
364 | * before going *any further*, validate the sector size and if the | |
365 | * version says we should have CRCs enabled, validate that. | |
366 | */ | |
367 | ||
368 | /* check to make sure sectorsize is legal 2^N, 9 <= N <= 15 */ | |
369 | if (sb->sb_sectsize == 0) | |
370 | return(XR_BAD_SECT_SIZE_DATA); | |
371 | ||
372 | bsize = 1; | |
373 | for (i = 0; bsize < sb->sb_sectsize && | |
374 | i < sizeof(sb->sb_sectsize) * NBBY; i++) { | |
375 | bsize <<= 1; | |
376 | } | |
377 | ||
378 | if (i < XFS_MIN_SECTORSIZE_LOG || i > XFS_MAX_SECTORSIZE_LOG) | |
379 | return(XR_BAD_SECT_SIZE_DATA); | |
380 | ||
381 | /* check sb sectorsize field against sb sectlog field */ | |
382 | if (i != sb->sb_sectlog) | |
383 | return(XR_BAD_SECT_SIZE_DATA); | |
384 | ||
385 | /* sector size in range - CRC check time */ | |
386 | if (xfs_sb_version_hascrc(sb) && | |
e2f60652 | 387 | !libxfs_verify_cksum(sb_buf, sb->sb_sectsize, XFS_SB_CRC_OFF)) |
88f364a9 | 388 | return XR_BAD_CRC; |
2bd0ea18 | 389 | |
ef12e076 BD |
390 | /* check to ensure blocksize and blocklog are legal */ |
391 | ret = verify_sb_blocksize(sb); | |
392 | if (ret != 0) | |
393 | return ret; | |
2bd0ea18 NS |
394 | |
395 | /* sanity check ag count, size fields against data size field */ | |
396 | ||
397 | if (sb->sb_dblocks == 0 || | |
02b56f87 DW |
398 | sb->sb_dblocks > XFS_MAX_DBLOCKS(sb) || |
399 | sb->sb_dblocks < XFS_MIN_DBLOCKS(sb)) | |
2bd0ea18 NS |
400 | return(XR_BAD_FS_SIZE_DATA); |
401 | ||
24f4f998 | 402 | if (sb->sb_agblklog != (uint8_t)log2_roundup(sb->sb_agblocks)) |
2bd0ea18 NS |
403 | return(XR_BAD_FS_SIZE_DATA); |
404 | ||
02b56f87 DW |
405 | if (sb->sb_inodesize < XFS_DINODE_MIN_SIZE || |
406 | sb->sb_inodesize > XFS_DINODE_MAX_SIZE || | |
407 | sb->sb_inodelog < XFS_DINODE_MIN_LOG || | |
408 | sb->sb_inodelog > XFS_DINODE_MAX_LOG || | |
409 | sb->sb_inodesize != (1 << sb->sb_inodelog) || | |
410 | sb->sb_logsunit > XLOG_MAX_RECORD_BSIZE || | |
411 | sb->sb_inopblock != howmany(sb->sb_blocksize, sb->sb_inodesize) || | |
412 | (sb->sb_blocklog - sb->sb_inodelog != sb->sb_inopblog)) | |
413 | return XR_BAD_INO_SIZE_DATA; | |
2bd0ea18 | 414 | |
5e656dbb | 415 | if (xfs_sb_version_hassector(sb)) { |
3cc4d0db NS |
416 | |
417 | /* check to make sure log sector is legal 2^N, 9 <= N <= 15 */ | |
418 | ||
419 | if (sb->sb_logsectsize == 0) | |
420 | return(XR_BAD_SECT_SIZE_DATA); | |
421 | ||
422 | bsize = 1; | |
423 | ||
424 | for (i = 0; bsize < sb->sb_logsectsize && | |
425 | i < sizeof(sb->sb_logsectsize) * NBBY; i++) { | |
426 | bsize <<= 1; | |
427 | } | |
428 | ||
429 | if (i < XFS_MIN_SECTORSIZE_LOG || i > XFS_MAX_SECTORSIZE_LOG) | |
430 | return(XR_BAD_SECT_SIZE_DATA); | |
431 | ||
432 | /* check sb log sectorsize field against sb log sectlog field */ | |
433 | ||
434 | if (i != sb->sb_logsectlog) | |
435 | return(XR_BAD_SECT_SIZE_DATA); | |
436 | } | |
437 | ||
2bd0ea18 NS |
438 | /* |
439 | * real-time extent size is always set | |
440 | */ | |
441 | if (sb->sb_rextsize * sb->sb_blocksize > XFS_MAX_RTEXTSIZE) | |
442 | return(XR_BAD_RT_GEO_DATA); | |
443 | ||
444 | if (sb->sb_rextsize * sb->sb_blocksize < XFS_MIN_RTEXTSIZE) | |
445 | return(XR_BAD_RT_GEO_DATA); | |
446 | ||
447 | if (sb->sb_rblocks == 0) { | |
448 | if (sb->sb_rextents != 0) | |
449 | return(XR_BAD_RT_GEO_DATA); | |
450 | ||
451 | if (sb->sb_rbmblocks != 0) | |
452 | return(XR_BAD_RT_GEO_DATA); | |
453 | ||
454 | if (sb->sb_rextslog != 0) | |
455 | return(XR_BAD_RT_GEO_DATA); | |
456 | ||
457 | if (sb->sb_frextents != 0) | |
458 | return(XR_BAD_RT_GEO_DATA); | |
459 | } else { | |
460 | /* | |
461 | * if we have a real-time partition, sanity-check geometry | |
462 | */ | |
463 | if (sb->sb_rblocks / sb->sb_rextsize != sb->sb_rextents) | |
464 | return(XR_BAD_RT_GEO_DATA); | |
465 | ||
466 | if (sb->sb_rextslog != | |
467 | libxfs_highbit32((unsigned int)sb->sb_rextents)) | |
468 | return(XR_BAD_RT_GEO_DATA); | |
469 | ||
470 | if (sb->sb_rbmblocks != (xfs_extlen_t) howmany(sb->sb_rextents, | |
471 | NBBY * sb->sb_blocksize)) | |
472 | return(XR_BAD_RT_GEO_DATA); | |
473 | } | |
474 | ||
475 | /* | |
476 | * verify correctness of inode alignment if it's there | |
477 | */ | |
7b5f9801 DC |
478 | if (!sb_validate_ino_align(sb)) |
479 | return(XR_BAD_INO_ALIGN); | |
2bd0ea18 NS |
480 | |
481 | /* | |
482 | * verify max. % of inodes (sb_imax_pct) | |
483 | */ | |
484 | if (sb->sb_imax_pct > 100) | |
485 | return(XR_BAD_INO_MAX_PCT); | |
486 | ||
487 | /* | |
488 | * verify stripe alignment fields if present | |
489 | */ | |
5e656dbb | 490 | if (xfs_sb_version_hasdalign(sb)) { |
dfc130f3 RC |
491 | if ((!sb->sb_unit && sb->sb_width) || |
492 | (sb->sb_unit && sb->sb_agblocks % sb->sb_unit)) | |
2bd0ea18 NS |
493 | return(XR_BAD_SB_UNIT); |
494 | if ((sb->sb_unit && !sb->sb_width) || | |
495 | (sb->sb_width && sb->sb_unit && sb->sb_width % sb->sb_unit)) | |
496 | return(XR_BAD_SB_WIDTH); | |
02b56f87 DW |
497 | } else if (sb->sb_unit || sb->sb_width) |
498 | return XR_BAD_SB_WIDTH; | |
499 | ||
500 | /* Directory block log */ | |
501 | if (sb->sb_blocklog + sb->sb_dirblklog > XFS_MAX_BLOCKSIZE_LOG) | |
502 | return XR_BAD_DIR_SIZE_DATA; | |
2bd0ea18 | 503 | |
2bd0ea18 NS |
504 | return(XR_OK); |
505 | } | |
506 | ||
507 | void | |
508 | write_primary_sb(xfs_sb_t *sbp, int size) | |
509 | { | |
5e656dbb | 510 | xfs_dsb_t *buf; |
dfc130f3 | 511 | |
2bd0ea18 NS |
512 | if (no_modify) |
513 | return; | |
dfc130f3 | 514 | |
5e656dbb BN |
515 | buf = memalign(libxfs_device_alignment(), size); |
516 | if (buf == NULL) { | |
b74a1f6a | 517 | do_error(_("failed to memalign superblock buffer\n")); |
dfc130f3 | 518 | return; |
2bd0ea18 | 519 | } |
b74a1f6a | 520 | memset(buf, 0, size); |
2bd0ea18 | 521 | |
dc8878f4 | 522 | if (lseek(x.dfd, 0LL, SEEK_SET) != 0LL) { |
dfc130f3 | 523 | free(buf); |
507f4e33 | 524 | do_error(_("couldn't seek to offset 0 in filesystem\n")); |
dfc130f3 RC |
525 | } |
526 | ||
19ebedcf | 527 | libxfs_sb_to_disk(buf, sbp); |
2bd0ea18 | 528 | |
88f364a9 DC |
529 | if (xfs_sb_version_hascrc(sbp)) |
530 | xfs_update_cksum((char *)buf, size, XFS_SB_CRC_OFF); | |
531 | ||
b74a1f6a | 532 | if (write(x.dfd, buf, size) != size) { |
dfc130f3 | 533 | free(buf); |
507f4e33 | 534 | do_error(_("primary superblock write failed!\n")); |
dfc130f3 | 535 | } |
2bd0ea18 | 536 | |
dfc130f3 | 537 | free(buf); |
2bd0ea18 NS |
538 | } |
539 | ||
540 | /* | |
88f364a9 | 541 | * get a possible superblock -- checks for internal consistency |
2bd0ea18 NS |
542 | */ |
543 | int | |
544 | get_sb(xfs_sb_t *sbp, xfs_off_t off, int size, xfs_agnumber_t agno) | |
545 | { | |
546 | int error, rval; | |
5e656dbb | 547 | xfs_dsb_t *buf; |
dfc130f3 | 548 | |
5e656dbb BN |
549 | buf = memalign(libxfs_device_alignment(), size); |
550 | if (buf == NULL) { | |
2bd0ea18 | 551 | do_error( |
b74a1f6a | 552 | _("error reading superblock %u -- failed to memalign buffer\n"), |
5d1b7f0f | 553 | agno); |
2bd0ea18 NS |
554 | exit(1); |
555 | } | |
b74a1f6a | 556 | memset(buf, 0, size); |
419d647d | 557 | memset(sbp, 0, sizeof(*sbp)); |
2bd0ea18 NS |
558 | |
559 | /* try and read it first */ | |
560 | ||
dc8878f4 | 561 | if (lseek(x.dfd, off, SEEK_SET) != off) { |
2bd0ea18 | 562 | do_warn( |
5d1b7f0f | 563 | _("error reading superblock %u -- seek to offset %" PRId64 " failed\n"), |
2bd0ea18 | 564 | agno, off); |
70ee4153 | 565 | free(buf); |
2bd0ea18 NS |
566 | return(XR_EOF); |
567 | } | |
568 | ||
b74a1f6a | 569 | if ((rval = read(x.dfd, buf, size)) != size) { |
2bd0ea18 NS |
570 | error = errno; |
571 | do_warn( | |
5d1b7f0f | 572 | _("superblock read failed, offset %" PRId64 ", size %d, ag %u, rval %d\n"), |
b74a1f6a | 573 | off, size, agno, rval); |
2bd0ea18 NS |
574 | do_error("%s\n", strerror(error)); |
575 | } | |
5e656dbb | 576 | libxfs_sb_from_disk(sbp, buf); |
2bd0ea18 | 577 | |
88f364a9 DC |
578 | rval = verify_sb((char *)buf, sbp, agno == 0); |
579 | free(buf); | |
580 | return rval; | |
2bd0ea18 NS |
581 | } |
582 | ||
2bd0ea18 | 583 | /* returns element on list with highest reference count */ |
8b8a6b02 | 584 | static fs_geo_list_t * |
2bd0ea18 NS |
585 | get_best_geo(fs_geo_list_t *list) |
586 | { | |
587 | int cnt = 0; | |
588 | fs_geo_list_t *current, *rval = NULL; | |
589 | ||
590 | current = list; | |
591 | ||
592 | while (current != NULL) { | |
593 | if (current->refs > cnt) { | |
594 | rval = current; | |
595 | cnt = current->refs; | |
596 | } | |
597 | current = current->next; | |
598 | } | |
599 | ||
600 | return(rval); | |
601 | } | |
602 | ||
603 | /* adds geometry info to linked list. returns (sometimes new) head of list */ | |
8b8a6b02 | 604 | static fs_geo_list_t * |
2bd0ea18 NS |
605 | add_geo(fs_geo_list_t *list, fs_geometry_t *geo_p, int index) |
606 | { | |
607 | fs_geo_list_t *current = list; | |
dfc130f3 | 608 | |
2bd0ea18 NS |
609 | while (current != NULL) { |
610 | if (memcmp(geo_p, ¤t->geo, sizeof(fs_geometry_t)) == 0) { | |
611 | current->refs++; | |
612 | return(list); | |
613 | } | |
614 | ||
615 | current = current->next; | |
616 | } | |
617 | ||
618 | if ((current = malloc(sizeof(fs_geo_list_t))) == NULL) { | |
507f4e33 | 619 | do_error(_("couldn't malloc geometry structure\n")); |
2bd0ea18 NS |
620 | exit(1); |
621 | } | |
622 | ||
623 | current->geo = *geo_p; | |
624 | current->refs = 1; | |
625 | current->next = list; | |
626 | current->index = index; | |
627 | ||
628 | return(current); | |
629 | } | |
630 | ||
8b8a6b02 | 631 | static void |
2bd0ea18 NS |
632 | free_geo(fs_geo_list_t *list) |
633 | { | |
634 | fs_geo_list_t *next; | |
635 | fs_geo_list_t *current; | |
636 | ||
2bd0ea18 NS |
637 | for (current = list; current != NULL; current = next) { |
638 | next = current->next; | |
639 | free(current); | |
640 | } | |
641 | } | |
642 | ||
643 | void | |
644 | get_sb_geometry(fs_geometry_t *geo, xfs_sb_t *sbp) | |
645 | { | |
dab9b8d6 | 646 | memset(geo, 0, sizeof(fs_geometry_t)); |
2bd0ea18 NS |
647 | |
648 | /* | |
649 | * blindly set fields that we know are always good | |
650 | */ | |
651 | geo->sb_blocksize = sbp->sb_blocksize; | |
652 | geo->sb_dblocks = sbp->sb_dblocks; | |
653 | geo->sb_rblocks = sbp->sb_rblocks; | |
654 | geo->sb_rextents = sbp->sb_rextents; | |
655 | geo->sb_logstart = sbp->sb_logstart; | |
656 | geo->sb_rextsize = sbp->sb_rextsize; | |
657 | geo->sb_agblocks = sbp->sb_agblocks; | |
658 | geo->sb_agcount = sbp->sb_agcount; | |
659 | geo->sb_rbmblocks = sbp->sb_rbmblocks; | |
660 | geo->sb_logblocks = sbp->sb_logblocks; | |
661 | geo->sb_sectsize = sbp->sb_sectsize; | |
662 | geo->sb_inodesize = sbp->sb_inodesize; | |
663 | ||
5e656dbb | 664 | if (xfs_sb_version_hasalign(sbp)) |
2bd0ea18 NS |
665 | geo->sb_ialignbit = 1; |
666 | ||
5e656dbb | 667 | if (xfs_sb_version_hasdalign(sbp)) |
2bd0ea18 NS |
668 | geo->sb_salignbit = 1; |
669 | ||
5e656dbb | 670 | if (xfs_sb_version_hasextflgbit(sbp)) |
2bd0ea18 NS |
671 | geo->sb_extflgbit = 1; |
672 | ||
5f6f3660 | 673 | geo->sb_fully_zeroed = 1; |
2bd0ea18 NS |
674 | } |
675 | ||
676 | /* | |
677 | * the way to verify that a primary sb is consistent with the | |
678 | * filesystem is find the secondaries given the info in the | |
679 | * primary and compare the geometries in the secondaries against | |
680 | * the geometry indicated by the primary. | |
681 | * | |
ae181820 | 682 | * returns 0 if ok, else error code (XR_EOF, XR_INSUFF_SEC_SB, etc). |
2bd0ea18 NS |
683 | */ |
684 | int | |
685 | verify_set_primary_sb(xfs_sb_t *rsb, | |
686 | int sb_index, | |
687 | int *sb_modified) | |
688 | { | |
507f4e33 | 689 | xfs_off_t off; |
2bd0ea18 NS |
690 | fs_geometry_t geo; |
691 | xfs_sb_t *sb; | |
692 | fs_geo_list_t *list; | |
693 | fs_geo_list_t *current; | |
2bd0ea18 NS |
694 | xfs_agnumber_t agno; |
695 | int num_sbs; | |
2bd0ea18 NS |
696 | int size; |
697 | int num_ok; | |
698 | int retval; | |
f63fd268 DC |
699 | |
700 | /* | |
701 | * We haven't been able to validate the sector size yet properly | |
702 | * (e.g. in the case of repairing an image in a file), so we need to | |
703 | * take into account sector mismatches and so use the maximum possible | |
704 | * sector size rather than the sector size in @rsb. | |
705 | */ | |
706 | size = NUM_AGH_SECTS * (1 << (XFS_MAX_SECTORSIZE_LOG)); | |
2bd0ea18 NS |
707 | list = NULL; |
708 | num_ok = 0; | |
709 | *sb_modified = 0; | |
8216a58f | 710 | num_sbs = rsb->sb_agcount; |
2bd0ea18 NS |
711 | |
712 | sb = (xfs_sb_t *) alloc_ag_buf(size); | |
2bd0ea18 NS |
713 | |
714 | /* | |
715 | * put the primary sb geometry info onto the geometry list | |
716 | */ | |
2bd0ea18 NS |
717 | get_sb_geometry(&geo, rsb); |
718 | list = add_geo(list, &geo, sb_index); | |
719 | ||
720 | /* | |
8216a58f BF |
721 | * scan the secondaries and check them off as we get them so we only |
722 | * process each one once | |
2bd0ea18 | 723 | */ |
8216a58f BF |
724 | for (agno = 1; agno < rsb->sb_agcount; agno++) { |
725 | off = (xfs_off_t)agno * rsb->sb_agblocks << rsb->sb_blocklog; | |
2bd0ea18 | 726 | |
8216a58f BF |
727 | retval = get_sb(sb, off, size, agno); |
728 | if (retval == XR_EOF) | |
729 | goto out_free_list; | |
730 | ||
731 | if (retval == XR_OK) { | |
732 | /* | |
733 | * save away geometry info. don't bother checking the | |
734 | * sb against the agi/agf as the odds of the sb being | |
735 | * corrupted in a way that it is internally consistent | |
736 | * but not consistent with the rest of the filesystem is | |
737 | * really really low. | |
738 | */ | |
739 | get_sb_geometry(&geo, sb); | |
740 | list = add_geo(list, &geo, agno); | |
741 | num_ok++; | |
2bd0ea18 NS |
742 | } |
743 | } | |
744 | ||
745 | /* | |
746 | * see if we have enough superblocks to bother with | |
747 | */ | |
6d23d9a5 | 748 | retval = 0; |
548c2e3e LZ |
749 | if (num_ok < num_sbs / 2) { |
750 | retval = XR_INSUFF_SEC_SB; | |
751 | goto out_free_list; | |
752 | } | |
2bd0ea18 NS |
753 | |
754 | current = get_best_geo(list); | |
755 | ||
756 | /* | |
757 | * check that enough sbs agree that we're willing to | |
758 | * go with this geometry. if not, print out the | |
759 | * geometry and a message about the force option. | |
760 | */ | |
761 | switch (num_sbs) { | |
762 | case 2: | |
763 | /* | |
d4dd6ab5 CH |
764 | * If we only have two allocation groups, and the superblock |
765 | * in the second allocation group differs from the primary | |
766 | * superblock we can't verify the geometry information. | |
767 | * Warn the user about this situation and get out unless | |
768 | * explicitly overridden. | |
2bd0ea18 NS |
769 | */ |
770 | if (current->refs != 2) { | |
771 | if (!force_geo) { | |
507f4e33 | 772 | do_warn( |
d4dd6ab5 CH |
773 | _("Only two AGs detected and they do not match - " |
774 | "cannot validate filesystem geometry.\n" | |
775 | "Use the -o force_geometry option to proceed.\n")); | |
2bd0ea18 NS |
776 | exit(1); |
777 | } | |
778 | } | |
d4dd6ab5 | 779 | goto out_free_list; |
2bd0ea18 NS |
780 | case 1: |
781 | /* | |
d4dd6ab5 CH |
782 | * If we only have a single allocation group there is no |
783 | * secondary superblock that we can use to verify the geometry | |
784 | * information. Warn the user about this situation and get | |
785 | * out unless explicitly overridden. | |
2bd0ea18 NS |
786 | */ |
787 | if (!force_geo) { | |
d4dd6ab5 CH |
788 | do_warn( |
789 | _("Only one AG detected - " | |
790 | "cannot validate filesystem geometry.\n" | |
791 | "Use the -o force_geometry option to proceed.\n")); | |
2bd0ea18 NS |
792 | exit(1); |
793 | } | |
d4dd6ab5 | 794 | goto out_free_list; |
2bd0ea18 NS |
795 | default: |
796 | /* | |
797 | * at least half of the probed superblocks have | |
798 | * to agree. if they don't, this fs is probably | |
799 | * too far gone anyway considering the fact that | |
800 | * XFS normally doesn't alter the secondary superblocks. | |
801 | */ | |
802 | if (current->refs < num_sbs / 2) { | |
507f4e33 NS |
803 | do_warn( |
804 | _("Not enough matching superblocks - cannot proceed.\n")); | |
2bd0ea18 NS |
805 | exit(1); |
806 | } | |
807 | } | |
808 | ||
809 | /* | |
810 | * set the geometry into primary superblock if necessary. | |
811 | */ | |
812 | ||
813 | if (current->index != sb_index) { | |
814 | *sb_modified = 1; | |
41f361f8 | 815 | off = (xfs_off_t)current->index * current->geo.sb_agblocks |
2bd0ea18 NS |
816 | * current->geo.sb_blocksize; |
817 | if (get_sb(sb, off, current->geo.sb_sectsize, | |
818 | current->index) != XR_OK) | |
507f4e33 | 819 | do_error(_("could not read superblock\n")); |
2bd0ea18 NS |
820 | |
821 | copy_sb(sb, rsb); | |
822 | ||
823 | /* | |
824 | * turn off inprogress bit since this is the primary. | |
825 | * also save away values that we need to ensure are | |
826 | * consistent in the other secondaries. | |
827 | */ | |
828 | rsb->sb_inprogress = 0; | |
829 | sb_inoalignmt = sb->sb_inoalignmt; | |
830 | sb_unit = sb->sb_unit; | |
831 | sb_width = sb->sb_width; | |
832 | } | |
833 | ||
d4dd6ab5 | 834 | out_free_list: |
2bd0ea18 | 835 | free_geo(list); |
2bd0ea18 | 836 | free(sb); |
6d23d9a5 | 837 | return retval; |
2bd0ea18 | 838 | } |