blob: 651193b426f0d680d47210aa3a2902fd71c464a0
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * probe.c - identify a block device by its contents, and return a dev |
4 | * struct with the details |
5 | * |
6 | * Copyright (C) 1999 by Andries Brouwer |
7 | * Copyright (C) 1999, 2000, 2003 by Theodore Ts'o |
8 | * Copyright (C) 2001 by Andreas Dilger |
9 | * |
10 | * %Begin-Header% |
11 | * This file may be redistributed under the terms of the |
12 | * GNU Lesser General Public License. |
13 | * %End-Header% |
14 | */ |
15 | |
16 | #include <stdio.h> |
17 | #include <string.h> |
18 | #include <stdlib.h> |
19 | #include <unistd.h> |
20 | #include <fcntl.h> |
21 | #include <sys/types.h> |
22 | #ifdef HAVE_SYS_STAT_H |
23 | #include <sys/stat.h> |
24 | #endif |
25 | #ifdef HAVE_SYS_MKDEV_H |
26 | #include <sys/mkdev.h> |
27 | #endif |
28 | #ifdef HAVE_ERRNO_H |
29 | #include <errno.h> |
30 | #endif |
31 | #include "blkidP.h" |
32 | #include "../uuid/uuid.h" |
33 | #include "probe.h" |
34 | |
35 | /* |
36 | * This is a special case code to check for an MDRAID device. We do |
37 | * this special since it requires checking for a superblock at the end |
38 | * of the device. |
39 | */ |
40 | static int check_mdraid(int fd, unsigned char *ret_uuid) |
41 | { |
42 | struct mdp_superblock_s *md; |
43 | blkid_loff_t offset; |
44 | char buf[4096]; |
45 | |
46 | if (fd < 0) |
47 | return -BLKID_ERR_PARAM; |
48 | |
49 | offset = (blkid_get_dev_size(fd) & ~((blkid_loff_t)65535)) - 65536; |
50 | |
51 | if (blkid_llseek(fd, offset, 0) < 0 || |
52 | read(fd, buf, 4096) != 4096) |
53 | return -BLKID_ERR_IO; |
54 | |
55 | /* Check for magic number */ |
56 | if (memcmp("\251+N\374", buf, 4)) |
57 | return -BLKID_ERR_PARAM; |
58 | |
59 | if (!ret_uuid) |
60 | return 0; |
61 | *ret_uuid = 0; |
62 | |
63 | /* The MD UUID is not contiguous in the superblock, make it so */ |
64 | md = (struct mdp_superblock_s *)buf; |
65 | if (md->set_uuid0 || md->set_uuid1 || md->set_uuid2 || md->set_uuid3) { |
66 | memcpy(ret_uuid, &md->set_uuid0, 4); |
67 | memcpy(ret_uuid, &md->set_uuid1, 12); |
68 | } |
69 | return 0; |
70 | } |
71 | |
72 | static void set_uuid(blkid_dev dev, uuid_t uuid) |
73 | { |
74 | char str[37]; |
75 | |
76 | if (!uuid_is_null(uuid)) { |
77 | uuid_unparse(uuid, str); |
78 | blkid_set_tag(dev, "UUID", str, sizeof(str)); |
79 | } |
80 | } |
81 | |
82 | static void get_ext2_info(blkid_dev dev, unsigned char *buf) |
83 | { |
84 | struct ext2_super_block *es = (struct ext2_super_block *) buf; |
85 | const char *label = NULL; |
86 | |
87 | DBG(DEBUG_PROBE, printf("ext2_sb.compat = %08X:%08X:%08X\n", |
88 | blkid_le32(es->s_feature_compat), |
89 | blkid_le32(es->s_feature_incompat), |
90 | blkid_le32(es->s_feature_ro_compat))); |
91 | |
92 | if (strlen(es->s_volume_name)) |
93 | label = es->s_volume_name; |
94 | blkid_set_tag(dev, "LABEL", label, sizeof(es->s_volume_name)); |
95 | |
96 | set_uuid(dev, es->s_uuid); |
97 | } |
98 | |
99 | static int probe_ext3(int fd __BLKID_ATTR((unused)), |
100 | blkid_cache cache __BLKID_ATTR((unused)), |
101 | blkid_dev dev, |
102 | const struct blkid_magic *id __BLKID_ATTR((unused)), |
103 | unsigned char *buf) |
104 | { |
105 | struct ext2_super_block *es; |
106 | |
107 | es = (struct ext2_super_block *)buf; |
108 | |
109 | /* Distinguish between jbd and ext2/3 fs */ |
110 | if (blkid_le32(es->s_feature_incompat) & |
111 | EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) |
112 | return -BLKID_ERR_PARAM; |
113 | |
114 | /* Distinguish between ext3 and ext2 */ |
115 | if (!(blkid_le32(es->s_feature_compat) & |
116 | EXT3_FEATURE_COMPAT_HAS_JOURNAL)) |
117 | return -BLKID_ERR_PARAM; |
118 | |
119 | get_ext2_info(dev, buf); |
120 | |
121 | blkid_set_tag(dev, "SEC_TYPE", "ext2", sizeof("ext2")); |
122 | |
123 | return 0; |
124 | } |
125 | |
126 | static int probe_ext2(int fd __BLKID_ATTR((unused)), |
127 | blkid_cache cache __BLKID_ATTR((unused)), |
128 | blkid_dev dev, |
129 | const struct blkid_magic *id __BLKID_ATTR((unused)), |
130 | unsigned char *buf) |
131 | { |
132 | struct ext2_super_block *es; |
133 | |
134 | es = (struct ext2_super_block *)buf; |
135 | |
136 | /* Distinguish between jbd and ext2/3 fs */ |
137 | if (blkid_le32(es->s_feature_incompat) & |
138 | EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) |
139 | return -BLKID_ERR_PARAM; |
140 | |
141 | get_ext2_info(dev, buf); |
142 | |
143 | return 0; |
144 | } |
145 | |
146 | static int probe_jbd(int fd __BLKID_ATTR((unused)), |
147 | blkid_cache cache __BLKID_ATTR((unused)), |
148 | blkid_dev dev, |
149 | const struct blkid_magic *id __BLKID_ATTR((unused)), |
150 | unsigned char *buf) |
151 | { |
152 | struct ext2_super_block *es = (struct ext2_super_block *) buf; |
153 | |
154 | if (!(blkid_le32(es->s_feature_incompat) & |
155 | EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) |
156 | return -BLKID_ERR_PARAM; |
157 | |
158 | get_ext2_info(dev, buf); |
159 | |
160 | return 0; |
161 | } |
162 | |
163 | static int probe_vfat(int fd __BLKID_ATTR((unused)), |
164 | blkid_cache cache __BLKID_ATTR((unused)), |
165 | blkid_dev dev, |
166 | const struct blkid_magic *id __BLKID_ATTR((unused)), |
167 | unsigned char *buf) |
168 | { |
169 | struct vfat_super_block *vs; |
170 | char serno[10]; |
171 | const char *label = NULL; |
172 | int label_len = 0; |
173 | |
174 | vs = (struct vfat_super_block *)buf; |
175 | |
176 | if (strncmp(vs->vs_label, "NO NAME", 7)) { |
177 | char *end = vs->vs_label + sizeof(vs->vs_label) - 1; |
178 | |
179 | while (*end == ' ' && end >= vs->vs_label) |
180 | --end; |
181 | if (end >= vs->vs_label) { |
182 | label = vs->vs_label; |
183 | label_len = end - vs->vs_label + 1; |
184 | } |
185 | } |
186 | |
187 | /* We can't just print them as %04X, because they are unaligned */ |
188 | sprintf(serno, "%02X%02X-%02X%02X", vs->vs_serno[3], vs->vs_serno[2], |
189 | vs->vs_serno[1], vs->vs_serno[0]); |
190 | blkid_set_tag(dev, "LABEL", label, label_len); |
191 | blkid_set_tag(dev, "UUID", serno, sizeof(serno)); |
192 | |
193 | return 0; |
194 | } |
195 | |
196 | static int probe_msdos(int fd __BLKID_ATTR((unused)), |
197 | blkid_cache cache __BLKID_ATTR((unused)), |
198 | blkid_dev dev, |
199 | const struct blkid_magic *id __BLKID_ATTR((unused)), |
200 | unsigned char *buf) |
201 | { |
202 | struct msdos_super_block *ms = (struct msdos_super_block *) buf; |
203 | char serno[10]; |
204 | const char *label = NULL; |
205 | int label_len = 0; |
206 | |
207 | if (strncmp(ms->ms_label, "NO NAME", 7)) { |
208 | char *end = ms->ms_label + sizeof(ms->ms_label) - 1; |
209 | |
210 | while (*end == ' ' && end >= ms->ms_label) |
211 | --end; |
212 | if (end >= ms->ms_label) { |
213 | label = ms->ms_label; |
214 | label_len = end - ms->ms_label + 1; |
215 | } |
216 | } |
217 | |
218 | /* We can't just print them as %04X, because they are unaligned */ |
219 | sprintf(serno, "%02X%02X-%02X%02X", ms->ms_serno[3], ms->ms_serno[2], |
220 | ms->ms_serno[1], ms->ms_serno[0]); |
221 | blkid_set_tag(dev, "UUID", serno, 0); |
222 | blkid_set_tag(dev, "LABEL", label, label_len); |
223 | blkid_set_tag(dev, "SEC_TYPE", "msdos", sizeof("msdos")); |
224 | |
225 | return 0; |
226 | } |
227 | |
228 | static int probe_xfs(int fd __BLKID_ATTR((unused)), |
229 | blkid_cache cache __BLKID_ATTR((unused)), |
230 | blkid_dev dev, |
231 | const struct blkid_magic *id __BLKID_ATTR((unused)), |
232 | unsigned char *buf) |
233 | { |
234 | struct xfs_super_block *xs; |
235 | const char *label = NULL; |
236 | |
237 | xs = (struct xfs_super_block *)buf; |
238 | |
239 | if (strlen(xs->xs_fname)) |
240 | label = xs->xs_fname; |
241 | blkid_set_tag(dev, "LABEL", label, sizeof(xs->xs_fname)); |
242 | set_uuid(dev, xs->xs_uuid); |
243 | return 0; |
244 | } |
245 | |
246 | static int probe_reiserfs(int fd __BLKID_ATTR((unused)), |
247 | blkid_cache cache __BLKID_ATTR((unused)), |
248 | blkid_dev dev, |
249 | const struct blkid_magic *id, unsigned char *buf) |
250 | { |
251 | struct reiserfs_super_block *rs = (struct reiserfs_super_block *) buf; |
252 | unsigned int blocksize; |
253 | const char *label = NULL; |
254 | |
255 | blocksize = blkid_le16(rs->rs_blocksize); |
256 | |
257 | /* If the superblock is inside the journal, we have the wrong one */ |
258 | if (id->bim_kboff/(blocksize>>10) > blkid_le32(rs->rs_journal_block)) |
259 | return -BLKID_ERR_BIG; |
260 | |
261 | /* LABEL/UUID are only valid for later versions of Reiserfs v3.6. */ |
262 | if (!strcmp(id->bim_magic, "ReIsEr2Fs") || |
263 | !strcmp(id->bim_magic, "ReIsEr3Fs")) { |
264 | if (strlen(rs->rs_label)) |
265 | label = rs->rs_label; |
266 | set_uuid(dev, rs->rs_uuid); |
267 | } |
268 | blkid_set_tag(dev, "LABEL", label, sizeof(rs->rs_label)); |
269 | |
270 | return 0; |
271 | } |
272 | |
273 | static int probe_jfs(int fd __BLKID_ATTR((unused)), |
274 | blkid_cache cache __BLKID_ATTR((unused)), |
275 | blkid_dev dev, |
276 | const struct blkid_magic *id __BLKID_ATTR((unused)), |
277 | unsigned char *buf) |
278 | { |
279 | struct jfs_super_block *js; |
280 | const char *label = NULL; |
281 | |
282 | js = (struct jfs_super_block *)buf; |
283 | |
284 | if (strlen((char *) js->js_label)) |
285 | label = (char *) js->js_label; |
286 | blkid_set_tag(dev, "LABEL", label, sizeof(js->js_label)); |
287 | set_uuid(dev, js->js_uuid); |
288 | return 0; |
289 | } |
290 | |
291 | static int probe_romfs(int fd __BLKID_ATTR((unused)), |
292 | blkid_cache cache __BLKID_ATTR((unused)), |
293 | blkid_dev dev, |
294 | const struct blkid_magic *id __BLKID_ATTR((unused)), |
295 | unsigned char *buf) |
296 | { |
297 | struct romfs_super_block *ros; |
298 | const char *label = NULL; |
299 | |
300 | ros = (struct romfs_super_block *)buf; |
301 | |
302 | if (strlen((char *) ros->ros_volume)) |
303 | label = (char *) ros->ros_volume; |
304 | blkid_set_tag(dev, "LABEL", label, 0); |
305 | return 0; |
306 | } |
307 | |
308 | static int probe_cramfs(int fd __BLKID_ATTR((unused)), |
309 | blkid_cache cache __BLKID_ATTR((unused)), |
310 | blkid_dev dev, |
311 | const struct blkid_magic *id __BLKID_ATTR((unused)), |
312 | unsigned char *buf) |
313 | { |
314 | struct cramfs_super_block *csb; |
315 | const char *label = NULL; |
316 | |
317 | csb = (struct cramfs_super_block *)buf; |
318 | |
319 | if (strlen((char *) csb->name)) |
320 | label = (char *) csb->name; |
321 | blkid_set_tag(dev, "LABEL", label, 0); |
322 | return 0; |
323 | } |
324 | |
325 | static int probe_swap0(int fd __BLKID_ATTR((unused)), |
326 | blkid_cache cache __BLKID_ATTR((unused)), |
327 | blkid_dev dev, |
328 | const struct blkid_magic *id __BLKID_ATTR((unused)), |
329 | unsigned char *buf __BLKID_ATTR((unused))) |
330 | { |
331 | blkid_set_tag(dev, "UUID", 0, 0); |
332 | blkid_set_tag(dev, "LABEL", 0, 0); |
333 | return 0; |
334 | } |
335 | |
336 | static int probe_swap1(int fd, |
337 | blkid_cache cache __BLKID_ATTR((unused)), |
338 | blkid_dev dev, |
339 | const struct blkid_magic *id __BLKID_ATTR((unused)), |
340 | unsigned char *buf __BLKID_ATTR((unused))) |
341 | { |
342 | struct swap_id_block *sws; |
343 | |
344 | probe_swap0(fd, cache, dev, id, buf); |
345 | /* |
346 | * Version 1 swap headers are always located at offset of 1024 |
347 | * bytes, although the swap signature itself is located at the |
348 | * end of the page (which may vary depending on hardware |
349 | * pagesize). |
350 | */ |
351 | if (lseek(fd, 1024, SEEK_SET) < 0) return 1; |
352 | sws = xmalloc(1024); |
353 | if (read(fd, sws, 1024) != 1024) { |
354 | free(sws); |
355 | return 1; |
356 | } |
357 | |
358 | /* arbitrary sanity check.. is there any garbage down there? */ |
359 | if (sws->sws_pad[32] == 0 && sws->sws_pad[33] == 0) { |
360 | if (sws->sws_volume[0]) |
361 | blkid_set_tag(dev, "LABEL", (const char*)sws->sws_volume, |
362 | sizeof(sws->sws_volume)); |
363 | if (sws->sws_uuid[0]) |
364 | set_uuid(dev, sws->sws_uuid); |
365 | } |
366 | free(sws); |
367 | |
368 | return 0; |
369 | } |
370 | |
371 | static const char |
372 | * const udf_magic[] = { "BEA01", "BOOT2", "CD001", "CDW02", "NSR02", |
373 | "NSR03", "TEA01", 0 }; |
374 | |
375 | static int probe_udf(int fd, blkid_cache cache __BLKID_ATTR((unused)), |
376 | blkid_dev dev __BLKID_ATTR((unused)), |
377 | const struct blkid_magic *id __BLKID_ATTR((unused)), |
378 | unsigned char *buf __BLKID_ATTR((unused))) |
379 | { |
380 | int j, bs; |
381 | struct iso_volume_descriptor isosb; |
382 | const char *const *m; |
383 | |
384 | /* determine the block size by scanning in 2K increments |
385 | (block sizes larger than 2K will be null padded) */ |
386 | for (bs = 1; bs < 16; bs++) { |
387 | lseek(fd, bs*2048+32768, SEEK_SET); |
388 | if (read(fd, (char *)&isosb, sizeof(isosb)) != sizeof(isosb)) |
389 | return 1; |
390 | if (isosb.id[0]) |
391 | break; |
392 | } |
393 | |
394 | /* Scan up to another 64 blocks looking for additional VSD's */ |
395 | for (j = 1; j < 64; j++) { |
396 | if (j > 1) { |
397 | lseek(fd, j*bs*2048+32768, SEEK_SET); |
398 | if (read(fd, (char *)&isosb, sizeof(isosb)) |
399 | != sizeof(isosb)) |
400 | return 1; |
401 | } |
402 | /* If we find NSR0x then call it udf: |
403 | NSR01 for UDF 1.00 |
404 | NSR02 for UDF 1.50 |
405 | NSR03 for UDF 2.00 */ |
406 | if (!strncmp(isosb.id, "NSR0", 4)) |
407 | return 0; |
408 | for (m = udf_magic; *m; m++) |
409 | if (!strncmp(*m, isosb.id, 5)) |
410 | break; |
411 | if (*m == 0) |
412 | return 1; |
413 | } |
414 | return 1; |
415 | } |
416 | |
417 | static int probe_ocfs(int fd __BLKID_ATTR((unused)), |
418 | blkid_cache cache __BLKID_ATTR((unused)), |
419 | blkid_dev dev, |
420 | const struct blkid_magic *id __BLKID_ATTR((unused)), |
421 | unsigned char *buf) |
422 | { |
423 | struct ocfs_volume_header ovh; |
424 | struct ocfs_volume_label ovl; |
425 | __u32 major; |
426 | |
427 | memcpy(&ovh, buf, sizeof(ovh)); |
428 | memcpy(&ovl, buf+512, sizeof(ovl)); |
429 | |
430 | major = ocfsmajor(ovh); |
431 | if (major == 1) |
432 | blkid_set_tag(dev, "SEC_TYPE", "ocfs1", sizeof("ocfs1")); |
433 | else if (major >= 9) |
434 | blkid_set_tag(dev, "SEC_TYPE", "ntocfs", sizeof("ntocfs")); |
435 | |
436 | blkid_set_tag(dev, "LABEL", (const char*)ovl.label, ocfslabellen(ovl)); |
437 | blkid_set_tag(dev, "MOUNT", (const char*)ovh.mount, ocfsmountlen(ovh)); |
438 | set_uuid(dev, ovl.vol_id); |
439 | return 0; |
440 | } |
441 | |
442 | static int probe_ocfs2(int fd __BLKID_ATTR((unused)), |
443 | blkid_cache cache __BLKID_ATTR((unused)), |
444 | blkid_dev dev, |
445 | const struct blkid_magic *id __BLKID_ATTR((unused)), |
446 | unsigned char *buf) |
447 | { |
448 | struct ocfs2_super_block *osb; |
449 | |
450 | osb = (struct ocfs2_super_block *)buf; |
451 | |
452 | blkid_set_tag(dev, "LABEL", (const char*)osb->s_label, sizeof(osb->s_label)); |
453 | set_uuid(dev, osb->s_uuid); |
454 | return 0; |
455 | } |
456 | |
457 | static int probe_oracleasm(int fd __BLKID_ATTR((unused)), |
458 | blkid_cache cache __BLKID_ATTR((unused)), |
459 | blkid_dev dev, |
460 | const struct blkid_magic *id __BLKID_ATTR((unused)), |
461 | unsigned char *buf) |
462 | { |
463 | struct oracle_asm_disk_label *dl; |
464 | |
465 | dl = (struct oracle_asm_disk_label *)buf; |
466 | |
467 | blkid_set_tag(dev, "LABEL", dl->dl_id, sizeof(dl->dl_id)); |
468 | return 0; |
469 | } |
470 | |
471 | /* |
472 | * BLKID_BLK_OFFS is at least as large as the highest bim_kboff defined |
473 | * in the type_array table below + bim_kbalign. |
474 | * |
475 | * When probing for a lot of magics, we handle everything in 1kB buffers so |
476 | * that we don't have to worry about reading each combination of block sizes. |
477 | */ |
478 | #define BLKID_BLK_OFFS 64 /* currently reiserfs */ |
479 | |
480 | /* |
481 | * Various filesystem magics that we can check for. Note that kboff and |
482 | * sboff are in kilobytes and bytes respectively. All magics are in |
483 | * byte strings so we don't worry about endian issues. |
484 | */ |
485 | static const struct blkid_magic type_array[] = { |
486 | /* type kboff sboff len magic probe */ |
487 | { "oracleasm", 0, 32, 8, "ORCLDISK", probe_oracleasm }, |
488 | { "ntfs", 0, 3, 8, "NTFS ", 0 }, |
489 | { "jbd", 1, 0x38, 2, "\123\357", probe_jbd }, |
490 | { "ext3", 1, 0x38, 2, "\123\357", probe_ext3 }, |
491 | { "ext2", 1, 0x38, 2, "\123\357", probe_ext2 }, |
492 | { "reiserfs", 8, 0x34, 8, "ReIsErFs", probe_reiserfs }, |
493 | { "reiserfs", 64, 0x34, 9, "ReIsEr2Fs", probe_reiserfs }, |
494 | { "reiserfs", 64, 0x34, 9, "ReIsEr3Fs", probe_reiserfs }, |
495 | { "reiserfs", 64, 0x34, 8, "ReIsErFs", probe_reiserfs }, |
496 | { "reiserfs", 8, 20, 8, "ReIsErFs", probe_reiserfs }, |
497 | { "vfat", 0, 0x52, 5, "MSWIN", probe_vfat }, |
498 | { "vfat", 0, 0x52, 8, "FAT32 ", probe_vfat }, |
499 | { "vfat", 0, 0x36, 5, "MSDOS", probe_msdos }, |
500 | { "vfat", 0, 0x36, 8, "FAT16 ", probe_msdos }, |
501 | { "vfat", 0, 0x36, 8, "FAT12 ", probe_msdos }, |
502 | { "minix", 1, 0x10, 2, "\177\023", 0 }, |
503 | { "minix", 1, 0x10, 2, "\217\023", 0 }, |
504 | { "minix", 1, 0x10, 2, "\150\044", 0 }, |
505 | { "minix", 1, 0x10, 2, "\170\044", 0 }, |
506 | { "vxfs", 1, 0, 4, "\365\374\001\245", 0 }, |
507 | { "xfs", 0, 0, 4, "XFSB", probe_xfs }, |
508 | { "romfs", 0, 0, 8, "-rom1fs-", probe_romfs }, |
509 | { "bfs", 0, 0, 4, "\316\372\173\033", 0 }, |
510 | { "cramfs", 0, 0, 4, "E=\315\050", probe_cramfs }, |
511 | { "qnx4", 0, 4, 6, "QNX4FS", 0 }, |
512 | { "udf", 32, 1, 5, "BEA01", probe_udf }, |
513 | { "udf", 32, 1, 5, "BOOT2", probe_udf }, |
514 | { "udf", 32, 1, 5, "CD001", probe_udf }, |
515 | { "udf", 32, 1, 5, "CDW02", probe_udf }, |
516 | { "udf", 32, 1, 5, "NSR02", probe_udf }, |
517 | { "udf", 32, 1, 5, "NSR03", probe_udf }, |
518 | { "udf", 32, 1, 5, "TEA01", probe_udf }, |
519 | { "iso9660", 32, 1, 5, "CD001", 0 }, |
520 | { "iso9660", 32, 9, 5, "CDROM", 0 }, |
521 | { "jfs", 32, 0, 4, "JFS1", probe_jfs }, |
522 | { "hfs", 1, 0, 2, "BD", 0 }, |
523 | { "ufs", 8, 0x55c, 4, "T\031\001\000", 0 }, |
524 | { "hpfs", 8, 0, 4, "I\350\225\371", 0 }, |
525 | { "sysv", 0, 0x3f8, 4, "\020~\030\375", 0 }, |
526 | { "swap", 0, 0xff6, 10, "SWAP-SPACE", probe_swap0 }, |
527 | { "swap", 0, 0xff6, 10, "SWAPSPACE2", probe_swap1 }, |
528 | { "swap", 0, 0x1ff6, 10, "SWAP-SPACE", probe_swap0 }, |
529 | { "swap", 0, 0x1ff6, 10, "SWAPSPACE2", probe_swap1 }, |
530 | { "swap", 0, 0x3ff6, 10, "SWAP-SPACE", probe_swap0 }, |
531 | { "swap", 0, 0x3ff6, 10, "SWAPSPACE2", probe_swap1 }, |
532 | { "swap", 0, 0x7ff6, 10, "SWAP-SPACE", probe_swap0 }, |
533 | { "swap", 0, 0x7ff6, 10, "SWAPSPACE2", probe_swap1 }, |
534 | { "swap", 0, 0xfff6, 10, "SWAP-SPACE", probe_swap0 }, |
535 | { "swap", 0, 0xfff6, 10, "SWAPSPACE2", probe_swap1 }, |
536 | { "ocfs", 0, 8, 9, "OracleCFS", probe_ocfs }, |
537 | { "ocfs2", 1, 0, 6, "OCFSV2", probe_ocfs2 }, |
538 | { "ocfs2", 2, 0, 6, "OCFSV2", probe_ocfs2 }, |
539 | { "ocfs2", 4, 0, 6, "OCFSV2", probe_ocfs2 }, |
540 | { "ocfs2", 8, 0, 6, "OCFSV2", probe_ocfs2 }, |
541 | { NULL, 0, 0, 0, NULL, NULL } |
542 | }; |
543 | |
544 | /* |
545 | * Verify that the data in dev is consistent with what is on the actual |
546 | * block device (using the devname field only). Normally this will be |
547 | * called when finding items in the cache, but for long running processes |
548 | * is also desirable to revalidate an item before use. |
549 | * |
550 | * If we are unable to revalidate the data, we return the old data and |
551 | * do not set the BLKID_BID_FL_VERIFIED flag on it. |
552 | */ |
553 | blkid_dev blkid_verify(blkid_cache cache, blkid_dev dev) |
554 | { |
555 | const struct blkid_magic *id; |
556 | unsigned char *bufs[BLKID_BLK_OFFS + 1], *buf; |
557 | const char *type; |
558 | struct stat st; |
559 | time_t diff, now; |
560 | int fd, idx; |
561 | |
562 | if (!dev) |
563 | return NULL; |
564 | |
565 | now = time(NULL); |
566 | diff = now - dev->bid_time; |
567 | |
568 | if ((now < dev->bid_time) || |
569 | (diff < BLKID_PROBE_MIN) || |
570 | (dev->bid_flags & BLKID_BID_FL_VERIFIED && |
571 | diff < BLKID_PROBE_INTERVAL)) |
572 | return dev; |
573 | |
574 | DBG(DEBUG_PROBE, |
575 | printf("need to revalidate %s (time since last check %lu)\n", |
576 | dev->bid_name, diff)); |
577 | |
578 | fd = open(dev->bid_name, O_RDONLY); |
579 | if (fd < 0 |
580 | || fstat(fd, &st) < 0 |
581 | ) { |
582 | if (fd >= 0) |
583 | close(fd); |
584 | if (errno == ENXIO || errno == ENODEV || errno == ENOENT) { |
585 | blkid_free_dev(dev); |
586 | return NULL; |
587 | } |
588 | /* We don't have read permission, just return cache data. */ |
589 | DBG(DEBUG_PROBE, |
590 | printf("returning unverified data for %s\n", |
591 | dev->bid_name)); |
592 | return dev; |
593 | } |
594 | |
595 | memset(bufs, 0, sizeof(bufs)); |
596 | |
597 | /* |
598 | * Iterate over the type array. If we already know the type, |
599 | * then try that first. If it doesn't work, then blow away |
600 | * the type information, and try again. |
601 | * |
602 | */ |
603 | try_again: |
604 | type = 0; |
605 | if (!dev->bid_type || !strcmp(dev->bid_type, "mdraid")) { |
606 | uuid_t uuid; |
607 | |
608 | if (check_mdraid(fd, uuid) == 0) { |
609 | set_uuid(dev, uuid); |
610 | type = "mdraid"; |
611 | goto found_type; |
612 | } |
613 | } |
614 | for (id = type_array; id->bim_type; id++) { |
615 | if (dev->bid_type && |
616 | strcmp(id->bim_type, dev->bid_type)) |
617 | continue; |
618 | |
619 | idx = id->bim_kboff + (id->bim_sboff >> 10); |
620 | if (idx > BLKID_BLK_OFFS || idx < 0) |
621 | continue; |
622 | buf = bufs[idx]; |
623 | if (!buf) { |
624 | if (lseek(fd, idx << 10, SEEK_SET) < 0) |
625 | continue; |
626 | |
627 | buf = xmalloc(1024); |
628 | |
629 | if (read(fd, buf, 1024) != 1024) { |
630 | free(buf); |
631 | continue; |
632 | } |
633 | bufs[idx] = buf; |
634 | } |
635 | |
636 | if (memcmp(id->bim_magic, buf + (id->bim_sboff&0x3ff), |
637 | id->bim_len)) |
638 | continue; |
639 | |
640 | if ((id->bim_probe == NULL) || |
641 | (id->bim_probe(fd, cache, dev, id, buf) == 0)) { |
642 | type = id->bim_type; |
643 | goto found_type; |
644 | } |
645 | } |
646 | |
647 | if (!id->bim_type && dev->bid_type) { |
648 | /* |
649 | * Zap the device filesystem type and try again |
650 | */ |
651 | blkid_set_tag(dev, "TYPE", 0, 0); |
652 | blkid_set_tag(dev, "SEC_TYPE", 0, 0); |
653 | blkid_set_tag(dev, "LABEL", 0, 0); |
654 | blkid_set_tag(dev, "UUID", 0, 0); |
655 | goto try_again; |
656 | } |
657 | |
658 | if (!dev->bid_type) { |
659 | blkid_free_dev(dev); |
660 | close(fd); |
661 | return NULL; |
662 | } |
663 | |
664 | found_type: |
665 | if (dev && type) { |
666 | dev->bid_devno = st.st_rdev; |
667 | dev->bid_time = time(NULL); |
668 | dev->bid_flags |= BLKID_BID_FL_VERIFIED; |
669 | cache->bic_flags |= BLKID_BIC_FL_CHANGED; |
670 | |
671 | blkid_set_tag(dev, "TYPE", type, 0); |
672 | |
673 | DBG(DEBUG_PROBE, printf("%s: devno 0x%04llx, type %s\n", |
674 | dev->bid_name, st.st_rdev, type)); |
675 | } |
676 | |
677 | close(fd); |
678 | |
679 | return dev; |
680 | } |
681 | |
682 | int blkid_known_fstype(const char *fstype) |
683 | { |
684 | const struct blkid_magic *id; |
685 | |
686 | for (id = type_array; id->bim_type; id++) { |
687 | if (strcmp(fstype, id->bim_type) == 0) |
688 | return 1; |
689 | } |
690 | return 0; |
691 | } |
692 | |
693 | #ifdef TEST_PROGRAM |
694 | int main(int argc, char **argv) |
695 | { |
696 | blkid_dev dev; |
697 | blkid_cache cache; |
698 | int ret; |
699 | |
700 | blkid_debug_mask = DEBUG_ALL; |
701 | if (argc != 2) { |
702 | fprintf(stderr, "Usage: %s device\n" |
703 | "Probe a single device to determine type\n", argv[0]); |
704 | exit(1); |
705 | } |
706 | if ((ret = blkid_get_cache(&cache, bb_dev_null)) != 0) { |
707 | fprintf(stderr, "%s: error creating cache (%d)\n", |
708 | argv[0], ret); |
709 | exit(1); |
710 | } |
711 | dev = blkid_get_dev(cache, argv[1], BLKID_DEV_NORMAL); |
712 | if (!dev) { |
713 | printf("%s: %s has an unsupported type\n", argv[0], argv[1]); |
714 | return 1; |
715 | } |
716 | printf("%s is type %s\n", argv[1], dev->bid_type ? |
717 | dev->bid_type : "(null)"); |
718 | if (dev->bid_label) |
719 | printf("\tlabel is '%s'\n", dev->bid_label); |
720 | if (dev->bid_uuid) |
721 | printf("\tuuid is %s\n", dev->bid_uuid); |
722 | |
723 | blkid_free_dev(dev); |
724 | return 0; |
725 | } |
726 | #endif |
727 |