source: MondoRescue/branches/2.2.5/mindi-busybox/e2fsprogs/old_e2fsprogs/blkid/probe.c@ 1765

Last change on this file since 1765 was 1765, checked in by Bruno Cornec, 16 years ago

Update to busybox 1.7.2
  • Property svn:eol-style set to native
File size: 19.7 KB
Line 
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 */
40static 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
72static 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
82static 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 = 0;
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
99static 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
126static 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
146static 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
163static 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 = 0;
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
196static 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 = 0;
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
228static 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 = 0;
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
246static 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 = 0;
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
273static 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 = 0;
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
291static 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 = 0;
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
308static 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 = 0;
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
325static 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
336static 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
371static const char
372* const udf_magic[] = { "BEA01", "BOOT2", "CD001", "CDW02", "NSR02",
373 "NSR03", "TEA01", 0 };
374
375static 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
417static 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
442static 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
457static 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 */
485static 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 */
553blkid_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(0);
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 if (((fd = open(dev->bid_name, O_RDONLY)) < 0) ||
579 (fstat(fd, &st) < 0)) {
580 if (errno == ENXIO || errno == ENODEV || errno == ENOENT) {
581 blkid_free_dev(dev);
582 return NULL;
583 }
584 /* We don't have read permission, just return cache data. */
585 DBG(DEBUG_PROBE,
586 printf("returning unverified data for %s\n",
587 dev->bid_name));
588 return dev;
589 }
590
591 memset(bufs, 0, sizeof(bufs));
592
593 /*
594 * Iterate over the type array. If we already know the type,
595 * then try that first. If it doesn't work, then blow away
596 * the type information, and try again.
597 *
598 */
599try_again:
600 type = 0;
601 if (!dev->bid_type || !strcmp(dev->bid_type, "mdraid")) {
602 uuid_t uuid;
603
604 if (check_mdraid(fd, uuid) == 0) {
605 set_uuid(dev, uuid);
606 type = "mdraid";
607 goto found_type;
608 }
609 }
610 for (id = type_array; id->bim_type; id++) {
611 if (dev->bid_type &&
612 strcmp(id->bim_type, dev->bid_type))
613 continue;
614
615 idx = id->bim_kboff + (id->bim_sboff >> 10);
616 if (idx > BLKID_BLK_OFFS || idx < 0)
617 continue;
618 buf = bufs[idx];
619 if (!buf) {
620 if (lseek(fd, idx << 10, SEEK_SET) < 0)
621 continue;
622
623 buf = xmalloc(1024);
624
625 if (read(fd, buf, 1024) != 1024) {
626 free(buf);
627 continue;
628 }
629 bufs[idx] = buf;
630 }
631
632 if (memcmp(id->bim_magic, buf + (id->bim_sboff&0x3ff),
633 id->bim_len))
634 continue;
635
636 if ((id->bim_probe == NULL) ||
637 (id->bim_probe(fd, cache, dev, id, buf) == 0)) {
638 type = id->bim_type;
639 goto found_type;
640 }
641 }
642
643 if (!id->bim_type && dev->bid_type) {
644 /*
645 * Zap the device filesystem type and try again
646 */
647 blkid_set_tag(dev, "TYPE", 0, 0);
648 blkid_set_tag(dev, "SEC_TYPE", 0, 0);
649 blkid_set_tag(dev, "LABEL", 0, 0);
650 blkid_set_tag(dev, "UUID", 0, 0);
651 goto try_again;
652 }
653
654 if (!dev->bid_type) {
655 blkid_free_dev(dev);
656 return NULL;
657 }
658
659found_type:
660 if (dev && type) {
661 dev->bid_devno = st.st_rdev;
662 dev->bid_time = time(0);
663 dev->bid_flags |= BLKID_BID_FL_VERIFIED;
664 cache->bic_flags |= BLKID_BIC_FL_CHANGED;
665
666 blkid_set_tag(dev, "TYPE", type, 0);
667
668 DBG(DEBUG_PROBE, printf("%s: devno 0x%04llx, type %s\n",
669 dev->bid_name, st.st_rdev, type));
670 }
671
672 close(fd);
673
674 return dev;
675}
676
677int blkid_known_fstype(const char *fstype)
678{
679 const struct blkid_magic *id;
680
681 for (id = type_array; id->bim_type; id++) {
682 if (strcmp(fstype, id->bim_type) == 0)
683 return 1;
684 }
685 return 0;
686}
687
688#ifdef TEST_PROGRAM
689int main(int argc, char **argv)
690{
691 blkid_dev dev;
692 blkid_cache cache;
693 int ret;
694
695 blkid_debug_mask = DEBUG_ALL;
696 if (argc != 2) {
697 fprintf(stderr, "Usage: %s device\n"
698 "Probe a single device to determine type\n", argv[0]);
699 exit(1);
700 }
701 if ((ret = blkid_get_cache(&cache, bb_dev_null)) != 0) {
702 fprintf(stderr, "%s: error creating cache (%d)\n",
703 argv[0], ret);
704 exit(1);
705 }
706 dev = blkid_get_dev(cache, argv[1], BLKID_DEV_NORMAL);
707 if (!dev) {
708 printf("%s: %s has an unsupported type\n", argv[0], argv[1]);
709 return 1;
710 }
711 printf("%s is type %s\n", argv[1], dev->bid_type ?
712 dev->bid_type : "(null)");
713 if (dev->bid_label)
714 printf("\tlabel is '%s'\n", dev->bid_label);
715 if (dev->bid_uuid)
716 printf("\tuuid is %s\n", dev->bid_uuid);
717
718 blkid_free_dev(dev);
719 return 0;
720}
721#endif
Note: See TracBrowser for help on using the repository browser.