1 /*
2 * probe.c - identify a block device by its contents, and return a dev
3 * struct with the details
4 *
5 * Copyright (C) 1999 by Andries Brouwer
6 * Copyright (C) 1999, 2000, 2003 by Theodore Ts'o
7 * Copyright (C) 2001 by Andreas Dilger
8 * Copyright (C) 2004 Kay Sievers <[email protected]>
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 "config.h"
17 #include <stdio.h>
18 #include <string.h>
19 #include <stdlib.h>
20 #include <time.h>
21 #include <unistd.h>
22 #include <fcntl.h>
23 #include <ctype.h>
24 #include <sys/types.h>
25 #ifdef HAVE_SYS_STAT_H
26 #include <sys/stat.h>
27 #endif
28 #ifdef HAVE_SYS_MKDEV_H
29 #include <sys/mkdev.h>
30 #endif
31 #ifdef __linux__
32 #include <sys/utsname.h>
33 #endif
34 #ifdef HAVE_ERRNO_H
35 #include <errno.h>
36 #endif
37 #include "blkidP.h"
38 #include "uuid/uuid.h"
39 #include "probe.h"
40
figure_label_len(const unsigned char * label,int len)41 static int figure_label_len(const unsigned char *label, int len)
42 {
43 const unsigned char *end = label + len - 1;
44
45 while (end >= label && (*end == ' ' || *end == 0))
46 --end;
47 if (end >= label)
48 return end - label + 1;
49 return 0;
50 }
51
get_buffer(struct blkid_probe * pr,blkid_loff_t off,size_t len)52 static unsigned char *get_buffer(struct blkid_probe *pr,
53 blkid_loff_t off, size_t len)
54 {
55 ssize_t ret_read;
56 unsigned char *newbuf;
57
58 if (off + len <= SB_BUFFER_SIZE) {
59 if (!pr->sbbuf) {
60 pr->sbbuf = malloc(SB_BUFFER_SIZE);
61 if (!pr->sbbuf)
62 return NULL;
63 if (lseek(pr->fd, 0, SEEK_SET) < 0)
64 return NULL;
65 ret_read = read(pr->fd, pr->sbbuf, SB_BUFFER_SIZE);
66 if (ret_read < 0)
67 ret_read = 0;
68 pr->sb_valid = ret_read;
69 }
70 if (off+len > pr->sb_valid)
71 return NULL;
72 return pr->sbbuf + off;
73 } else {
74 if (len > pr->buf_max) {
75 newbuf = realloc(pr->buf, len);
76 if (newbuf == NULL)
77 return NULL;
78 pr->buf = newbuf;
79 pr->buf_max = len;
80 }
81 if (blkid_llseek(pr->fd, off, SEEK_SET) < 0)
82 return NULL;
83 ret_read = read(pr->fd, pr->buf, len);
84 if (ret_read != (ssize_t) len)
85 return NULL;
86 return pr->buf;
87 }
88 }
89
90
91 /*
92 * This is a special case code to check for an MDRAID device. We do
93 * this special since it requires checking for a superblock at the end
94 * of the device.
95 */
check_mdraid(int fd,unsigned char * ret_uuid)96 static int check_mdraid(int fd, unsigned char *ret_uuid)
97 {
98 struct mdp_superblock_s *md;
99 blkid_loff_t offset;
100 char buf[4096];
101
102 if (fd < 0)
103 return -BLKID_ERR_PARAM;
104
105 offset = (blkid_get_dev_size(fd) & ~((blkid_loff_t)65535)) - 65536;
106
107 if (blkid_llseek(fd, offset, 0) < 0 ||
108 read(fd, buf, 4096) != 4096)
109 return -BLKID_ERR_IO;
110 /* Check for magic number */
111 if (memcmp("\251+N\374", buf, 4) && memcmp("\374N+\251", buf, 4))
112 return -BLKID_ERR_PARAM;
113
114 if (!ret_uuid)
115 return 0;
116 *ret_uuid = 0;
117
118 /* The MD UUID is not contiguous in the superblock, make it so */
119 md = (struct mdp_superblock_s *)buf;
120 if (md->set_uuid0 || md->set_uuid1 || md->set_uuid2 || md->set_uuid3) {
121 memcpy(ret_uuid, &md->set_uuid0, 4);
122 memcpy(ret_uuid + 4, &md->set_uuid1, 12);
123 }
124 return 0;
125 }
126
set_uuid(blkid_dev dev,uuid_t uuid,const char * tag)127 static void set_uuid(blkid_dev dev, uuid_t uuid, const char *tag)
128 {
129 char str[37];
130
131 if (!uuid_is_null(uuid)) {
132 uuid_unparse(uuid, str);
133 blkid_set_tag(dev, tag ? tag : "UUID", str, sizeof(str));
134 }
135 }
136
get_ext2_info(blkid_dev dev,struct blkid_magic * id,unsigned char * buf)137 static void get_ext2_info(blkid_dev dev, struct blkid_magic *id,
138 unsigned char *buf)
139 {
140 struct ext2_super_block *es = (struct ext2_super_block *) buf;
141 const char *label = 0;
142
143 DBG(DEBUG_PROBE, printf("ext2_sb.compat = %08X:%08X:%08X\n",
144 blkid_le32(es->s_feature_compat),
145 blkid_le32(es->s_feature_incompat),
146 blkid_le32(es->s_feature_ro_compat)));
147
148 if (es->s_volume_name[0])
149 label = es->s_volume_name;
150 blkid_set_tag(dev, "LABEL", label, sizeof(es->s_volume_name));
151
152 set_uuid(dev, es->s_uuid, 0);
153
154 if ((es->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
155 !uuid_is_null(es->s_journal_uuid))
156 set_uuid(dev, es->s_journal_uuid, "EXT_JOURNAL");
157
158 if (strcmp(id->bim_type, "ext2") &&
159 ((blkid_le32(es->s_feature_incompat) &
160 EXT2_FEATURE_INCOMPAT_UNSUPPORTED) == 0))
161 blkid_set_tag(dev, "SEC_TYPE", "ext2", sizeof("ext2"));
162 }
163
164 /*
165 * Check to see if a filesystem is in /proc/filesystems.
166 * Returns 1 if found, 0 if not
167 */
fs_proc_check(const char * fs_name)168 static int fs_proc_check(const char *fs_name)
169 {
170 FILE *f;
171 char buf[80], *cp, *t;
172
173 f = fopen("/proc/filesystems", "r");
174 if (!f)
175 return (0);
176 while (!feof(f)) {
177 if (!fgets(buf, sizeof(buf), f))
178 break;
179 cp = buf;
180 if (!isspace(*cp)) {
181 while (*cp && !isspace(*cp))
182 cp++;
183 }
184 while (*cp && isspace(*cp))
185 cp++;
186 if ((t = strchr(cp, '\n')) != NULL)
187 *t = 0;
188 if ((t = strchr(cp, '\t')) != NULL)
189 *t = 0;
190 if ((t = strchr(cp, ' ')) != NULL)
191 *t = 0;
192 if (!strcmp(fs_name, cp)) {
193 fclose(f);
194 return (1);
195 }
196 }
197 fclose(f);
198 return (0);
199 }
200
201 /*
202 * Check to see if a filesystem is available as a module
203 * Returns 1 if found, 0 if not
204 */
check_for_modules(const char * fs_name)205 static int check_for_modules(const char *fs_name)
206 {
207 #ifdef __linux__
208 struct utsname uts;
209 FILE *f;
210 char buf[1024], *cp;
211 int namesz;
212
213 if (uname(&uts))
214 return (0);
215 snprintf(buf, sizeof(buf), "/lib/modules/%s/modules.dep", uts.release);
216
217 f = fopen(buf, "r");
218 if (!f)
219 return (0);
220
221 namesz = strlen(fs_name);
222
223 while (!feof(f)) {
224 if (!fgets(buf, sizeof(buf), f))
225 break;
226 if ((cp = strchr(buf, ':')) != NULL)
227 *cp = 0;
228 else
229 continue;
230 if ((cp = strrchr(buf, '/')) != NULL)
231 cp++;
232 else
233 cp = buf;
234 if (!strncmp(cp, fs_name, namesz) &&
235 (!strcmp(cp + namesz, ".ko") ||
236 !strcmp(cp + namesz, ".ko.gz"))) {
237 fclose(f);
238 return (1);
239 }
240 }
241 fclose(f);
242 #endif
243 return (0);
244 }
245
linux_version_code(void)246 static int linux_version_code(void)
247 {
248 #ifdef __linux__
249 struct utsname ut;
250 static int version_code = -1;
251 int major, minor, rev;
252 char *endptr;
253 const char *cp;
254
255 if (version_code > 0)
256 return version_code;
257
258 if (uname(&ut))
259 return 0;
260 cp = ut.release;
261
262 major = strtol(cp, &endptr, 10);
263 if (cp == endptr || *endptr != '.')
264 return 0;
265 cp = endptr + 1;
266 minor = strtol(cp, &endptr, 10);
267 if (cp == endptr || *endptr != '.')
268 return 0;
269 cp = endptr + 1;
270 rev = strtol(cp, &endptr, 10);
271 if (cp == endptr)
272 return 0;
273 version_code = (((major * 256) + minor) * 256) + rev;
274 return version_code;
275 #else
276 return 0;
277 #endif
278 }
279
280 #define EXT4_SUPPORTS_EXT2 (2 * 65536 + 6*256 + 29)
281
system_supports_ext2(void)282 static int system_supports_ext2(void)
283 {
284 static time_t last_check = 0;
285 static int ret = -1;
286 time_t now = time(0);
287
288 if (ret != -1 || (now - last_check) < 5)
289 return ret;
290 last_check = now;
291 ret = (fs_proc_check("ext2") || check_for_modules("ext2"));
292 return ret;
293 }
294
system_supports_ext4(void)295 static int system_supports_ext4(void)
296 {
297 static time_t last_check = 0;
298 static int ret = -1;
299 time_t now = time(0);
300
301 if (ret != -1 || (now - last_check) < 5)
302 return ret;
303 last_check = now;
304 ret = (fs_proc_check("ext4") || check_for_modules("ext4"));
305 return ret;
306 }
307
system_supports_ext4dev(void)308 static int system_supports_ext4dev(void)
309 {
310 static time_t last_check = 0;
311 static int ret = -1;
312 time_t now = time(0);
313
314 if (ret != -1 || (now - last_check) < 5)
315 return ret;
316 last_check = now;
317 ret = (fs_proc_check("ext4dev") || check_for_modules("ext4dev"));
318 return ret;
319 }
320
probe_ext4dev(struct blkid_probe * probe,struct blkid_magic * id,unsigned char * buf)321 static int probe_ext4dev(struct blkid_probe *probe,
322 struct blkid_magic *id,
323 unsigned char *buf)
324 {
325 struct ext2_super_block *es;
326 es = (struct ext2_super_block *)buf;
327
328 /* Distinguish from jbd */
329 if (blkid_le32(es->s_feature_incompat) &
330 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)
331 return -BLKID_ERR_PARAM;
332
333 /*
334 * If the filesystem does not have a journal and ext2 and ext4
335 * is not present, then force this to be detected as an
336 * ext4dev filesystem.
337 */
338 if (!(blkid_le32(es->s_feature_compat) &
339 EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
340 !system_supports_ext2() && !system_supports_ext4() &&
341 system_supports_ext4dev() &&
342 linux_version_code() >= EXT4_SUPPORTS_EXT2)
343 goto force_ext4dev;
344
345 /*
346 * If the filesystem is marked as OK for use by in-development
347 * filesystem code, but ext4dev is not supported, and ext4 is,
348 * then don't call ourselves ext4dev, since we should be
349 * detected as ext4 in that case.
350 *
351 * If the filesystem is marked as in use by production
352 * filesystem, then it can only be used by ext4 and NOT by
353 * ext4dev, so always disclaim we are ext4dev in that case.
354 */
355 if (blkid_le32(es->s_flags) & EXT2_FLAGS_TEST_FILESYS) {
356 if (!system_supports_ext4dev() && system_supports_ext4())
357 return -BLKID_ERR_PARAM;
358 } else
359 return -BLKID_ERR_PARAM;
360
361 force_ext4dev:
362 get_ext2_info(probe->dev, id, buf);
363 return 0;
364 }
365
probe_ext4(struct blkid_probe * probe,struct blkid_magic * id,unsigned char * buf)366 static int probe_ext4(struct blkid_probe *probe, struct blkid_magic *id,
367 unsigned char *buf)
368 {
369 struct ext2_super_block *es;
370 es = (struct ext2_super_block *)buf;
371
372 /* Distinguish from jbd */
373 if (blkid_le32(es->s_feature_incompat) &
374 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)
375 return -BLKID_ERR_PARAM;
376
377 /*
378 * If the filesystem does not have a journal and ext2 is not
379 * present, then force this to be detected as an ext2
380 * filesystem.
381 */
382 if (!(blkid_le32(es->s_feature_compat) &
383 EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
384 !system_supports_ext2() && system_supports_ext4() &&
385 linux_version_code() >= EXT4_SUPPORTS_EXT2)
386 goto force_ext4;
387
388 /* Ext4 has at least one feature which ext3 doesn't understand */
389 if (!(blkid_le32(es->s_feature_ro_compat) &
390 EXT3_FEATURE_RO_COMPAT_UNSUPPORTED) &&
391 !(blkid_le32(es->s_feature_incompat) &
392 EXT3_FEATURE_INCOMPAT_UNSUPPORTED))
393 return -BLKID_ERR_PARAM;
394
395 force_ext4:
396 /*
397 * If the filesystem is a OK for use by in-development
398 * filesystem code, and ext4dev is supported or ext4 is not
399 * supported, then don't call ourselves ext4, so we can redo
400 * the detection and mark the filesystem as ext4dev.
401 *
402 * If the filesystem is marked as in use by production
403 * filesystem, then it can only be used by ext4 and NOT by
404 * ext4dev.
405 */
406 if (blkid_le32(es->s_flags) & EXT2_FLAGS_TEST_FILESYS) {
407 if (system_supports_ext4dev() || !system_supports_ext4())
408 return -BLKID_ERR_PARAM;
409 }
410 get_ext2_info(probe->dev, id, buf);
411 return 0;
412 }
413
probe_ext3(struct blkid_probe * probe,struct blkid_magic * id,unsigned char * buf)414 static int probe_ext3(struct blkid_probe *probe, struct blkid_magic *id,
415 unsigned char *buf)
416 {
417 struct ext2_super_block *es;
418 es = (struct ext2_super_block *)buf;
419
420 /* ext3 requires journal */
421 if (!(blkid_le32(es->s_feature_compat) &
422 EXT3_FEATURE_COMPAT_HAS_JOURNAL))
423 return -BLKID_ERR_PARAM;
424
425 /* Any features which ext3 doesn't understand */
426 if ((blkid_le32(es->s_feature_ro_compat) &
427 EXT3_FEATURE_RO_COMPAT_UNSUPPORTED) ||
428 (blkid_le32(es->s_feature_incompat) &
429 EXT3_FEATURE_INCOMPAT_UNSUPPORTED))
430 return -BLKID_ERR_PARAM;
431
432 get_ext2_info(probe->dev, id, buf);
433 return 0;
434 }
435
probe_ext2(struct blkid_probe * probe,struct blkid_magic * id,unsigned char * buf)436 static int probe_ext2(struct blkid_probe *probe, struct blkid_magic *id,
437 unsigned char *buf)
438 {
439 struct ext2_super_block *es;
440
441 es = (struct ext2_super_block *)buf;
442
443 /* Distinguish between ext3 and ext2 */
444 if ((blkid_le32(es->s_feature_compat) &
445 EXT3_FEATURE_COMPAT_HAS_JOURNAL))
446 return -BLKID_ERR_PARAM;
447
448 /* Any features which ext2 doesn't understand */
449 if ((blkid_le32(es->s_feature_ro_compat) &
450 EXT2_FEATURE_RO_COMPAT_UNSUPPORTED) ||
451 (blkid_le32(es->s_feature_incompat) &
452 EXT2_FEATURE_INCOMPAT_UNSUPPORTED))
453 return -BLKID_ERR_PARAM;
454
455 /*
456 * If ext2 is not present, but ext4 or ext4dev are, then
457 * disclaim we are ext2
458 */
459 if (!system_supports_ext2() &&
460 (system_supports_ext4() || system_supports_ext4dev()) &&
461 linux_version_code() >= EXT4_SUPPORTS_EXT2)
462 return -BLKID_ERR_PARAM;
463
464 get_ext2_info(probe->dev, id, buf);
465 return 0;
466 }
467
probe_jbd(struct blkid_probe * probe,struct blkid_magic * id,unsigned char * buf)468 static int probe_jbd(struct blkid_probe *probe, struct blkid_magic *id,
469 unsigned char *buf)
470 {
471 struct ext2_super_block *es = (struct ext2_super_block *) buf;
472
473 if (!(blkid_le32(es->s_feature_incompat) &
474 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV))
475 return -BLKID_ERR_PARAM;
476
477 get_ext2_info(probe->dev, id, buf);
478
479 return 0;
480 }
481
482 #define FAT_ATTR_VOLUME_ID 0x08
483 #define FAT_ATTR_DIR 0x10
484 #define FAT_ATTR_LONG_NAME 0x0f
485 #define FAT_ATTR_MASK 0x3f
486 #define FAT_ENTRY_FREE 0xe5
487
488 static const char *no_name = "NO NAME ";
489
search_fat_label(struct vfat_dir_entry * dir,int count)490 static unsigned char *search_fat_label(struct vfat_dir_entry *dir, int count)
491 {
492 int i;
493
494 for (i = 0; i < count; i++) {
495 if (dir[i].name[0] == 0x00)
496 break;
497
498 if ((dir[i].name[0] == FAT_ENTRY_FREE) ||
499 (dir[i].cluster_high != 0 || dir[i].cluster_low != 0) ||
500 ((dir[i].attr & FAT_ATTR_MASK) == FAT_ATTR_LONG_NAME))
501 continue;
502
503 if ((dir[i].attr & (FAT_ATTR_VOLUME_ID | FAT_ATTR_DIR)) ==
504 FAT_ATTR_VOLUME_ID) {
505 return dir[i].name;
506 }
507 }
508 return 0;
509 }
510
511 /* FAT label extraction from the root directory taken from Kay
512 * Sievers's volume_id library */
probe_fat(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)513 static int probe_fat(struct blkid_probe *probe,
514 struct blkid_magic *id __BLKID_ATTR((unused)),
515 unsigned char *buf)
516 {
517 struct vfat_super_block *vs = (struct vfat_super_block *) buf;
518 struct msdos_super_block *ms = (struct msdos_super_block *) buf;
519 struct vfat_dir_entry *dir;
520 char serno[10];
521 const unsigned char *label = 0, *vol_label = 0, *tmp;
522 unsigned char *vol_serno;
523 int label_len = 0, maxloop = 100;
524 __u16 sector_size, dir_entries, reserved;
525 __u32 sect_count, fat_size, dir_size, cluster_count, fat_length;
526 __u32 buf_size, start_data_sect, next, root_start, root_dir_entries;
527
528 /* sector size check */
529 tmp = (unsigned char *)&ms->ms_sector_size;
530 sector_size = tmp[0] + (tmp[1] << 8);
531 if (sector_size != 0x200 && sector_size != 0x400 &&
532 sector_size != 0x800 && sector_size != 0x1000)
533 return 1;
534
535 tmp = (unsigned char *)&ms->ms_dir_entries;
536 dir_entries = tmp[0] + (tmp[1] << 8);
537 reserved = blkid_le16(ms->ms_reserved);
538 tmp = (unsigned char *)&ms->ms_sectors;
539 sect_count = tmp[0] + (tmp[1] << 8);
540 if (sect_count == 0)
541 sect_count = blkid_le32(ms->ms_total_sect);
542
543 fat_length = blkid_le16(ms->ms_fat_length);
544 if (fat_length == 0)
545 fat_length = blkid_le32(vs->vs_fat32_length);
546
547 fat_size = fat_length * ms->ms_fats;
548 dir_size = ((dir_entries * sizeof(struct vfat_dir_entry)) +
549 (sector_size-1)) / sector_size;
550
551 cluster_count = sect_count - (reserved + fat_size + dir_size);
552 if (ms->ms_cluster_size == 0)
553 return 1;
554 cluster_count /= ms->ms_cluster_size;
555
556 if (cluster_count > FAT32_MAX)
557 return 1;
558
559 if (ms->ms_fat_length) {
560 /* the label may be an attribute in the root directory */
561 root_start = (reserved + fat_size) * sector_size;
562 root_dir_entries = vs->vs_dir_entries[0] +
563 (vs->vs_dir_entries[1] << 8);
564
565 buf_size = root_dir_entries * sizeof(struct vfat_dir_entry);
566 dir = (struct vfat_dir_entry *) get_buffer(probe, root_start,
567 buf_size);
568 if (dir)
569 vol_label = search_fat_label(dir, root_dir_entries);
570
571 if (!vol_label || !memcmp(vol_label, no_name, 11))
572 vol_label = ms->ms_label;
573 vol_serno = ms->ms_serno;
574
575 blkid_set_tag(probe->dev, "SEC_TYPE", "msdos",
576 sizeof("msdos"));
577 } else {
578 /* Search the FAT32 root dir for the label attribute */
579 buf_size = vs->vs_cluster_size * sector_size;
580 start_data_sect = reserved + fat_size;
581
582 next = blkid_le32(vs->vs_root_cluster);
583 while (next && --maxloop) {
584 __u32 next_sect_off;
585 __u64 next_off, fat_entry_off;
586 int count;
587
588 next_sect_off = (next - 2) * vs->vs_cluster_size;
589 next_off = (__u64) (start_data_sect + next_sect_off) *
590 sector_size;
591
592 dir = (struct vfat_dir_entry *)
593 get_buffer(probe, next_off, buf_size);
594 if (dir == NULL)
595 break;
596
597 count = buf_size / sizeof(struct vfat_dir_entry);
598
599 vol_label = search_fat_label(dir, count);
600 if (vol_label)
601 break;
602
603 /* get FAT entry */
604 fat_entry_off =
605 ((unsigned int) reserved *
606 (unsigned int) sector_size) +
607 (next * sizeof(__u32));
608 buf = get_buffer(probe, fat_entry_off, buf_size);
609 if (buf == NULL)
610 break;
611
612 /* set next cluster */
613 next = blkid_le32(*((__u32 *) buf) & 0x0fffffff);
614 }
615
616 if (!vol_label || !memcmp(vol_label, no_name, 11))
617 vol_label = vs->vs_label;
618 vol_serno = vs->vs_serno;
619 }
620
621 if (vol_label && memcmp(vol_label, no_name, 11)) {
622 if ((label_len = figure_label_len(vol_label, 11)))
623 label = vol_label;
624 }
625
626 /* We can't just print them as %04X, because they are unaligned */
627 sprintf(serno, "%02X%02X-%02X%02X", vol_serno[3], vol_serno[2],
628 vol_serno[1], vol_serno[0]);
629
630 blkid_set_tag(probe->dev, "LABEL", (const char *) label, label_len);
631 blkid_set_tag(probe->dev, "UUID", serno, sizeof(serno)-1);
632
633 return 0;
634 }
635
636 /*
637 * The FAT filesystem could be without a magic string in superblock
638 * (e.g. old floppies). This heuristic for FAT detection is inspired
639 * by http://vrfy.org/projects/volume_id/ and Linux kernel.
640 * [7-Jul-2005, Karel Zak <[email protected]>]
641 */
probe_fat_nomagic(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)642 static int probe_fat_nomagic(struct blkid_probe *probe,
643 struct blkid_magic *id __BLKID_ATTR((unused)),
644 unsigned char *buf)
645 {
646 struct msdos_super_block *ms;
647
648 ms = (struct msdos_super_block *)buf;
649
650 /* heads check */
651 if (ms->ms_heads == 0)
652 return 1;
653
654 /* cluster size check*/
655 if (ms->ms_cluster_size == 0 ||
656 (ms->ms_cluster_size & (ms->ms_cluster_size-1)))
657 return 1;
658
659 /* media check */
660 if (ms->ms_media < 0xf8 && ms->ms_media != 0xf0)
661 return 1;
662
663 /* fat counts(Linux kernel expects at least 1 FAT table) */
664 if (!ms->ms_fats)
665 return 1;
666
667 /*
668 * OS/2 and apparently DFSee will place a FAT12/16-like
669 * pseudo-superblock in the first 512 bytes of non-FAT
670 * filesystems --- at least JFS and HPFS, and possibly others.
671 * So we explicitly check for those filesystems at the
672 * FAT12/16 filesystem magic field identifier, and if they are
673 * present, we rule this out as a FAT filesystem, despite the
674 * FAT-like pseudo-header.
675 */
676 if ((memcmp(ms->ms_magic, "JFS ", 8) == 0) ||
677 (memcmp(ms->ms_magic, "HPFS ", 8) == 0))
678 return 1;
679
680 return probe_fat(probe, id, buf);
681 }
682
probe_ntfs(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)683 static int probe_ntfs(struct blkid_probe *probe,
684 struct blkid_magic *id __BLKID_ATTR((unused)),
685 unsigned char *buf)
686 {
687 struct ntfs_super_block *ns;
688 struct master_file_table_record *mft;
689 struct file_attribute *attr;
690 char uuid_str[17], label_str[129], *cp;
691 int bytes_per_sector, sectors_per_cluster;
692 int mft_record_size, attr_off, attr_len;
693 unsigned int i, attr_type, val_len;
694 int val_off;
695 __u64 nr_clusters;
696 blkid_loff_t off;
697 unsigned char *buf_mft, *val;
698
699 ns = (struct ntfs_super_block *) buf;
700
701 bytes_per_sector = ns->bios_parameter_block[0] +
702 (ns->bios_parameter_block[1] << 8);
703 sectors_per_cluster = ns->bios_parameter_block[2];
704
705 if ((bytes_per_sector < 512) || (sectors_per_cluster == 0))
706 return 1;
707
708 if (ns->cluster_per_mft_record < 0)
709 mft_record_size = 1 << (0-ns->cluster_per_mft_record);
710 else
711 mft_record_size = ns->cluster_per_mft_record *
712 sectors_per_cluster * bytes_per_sector;
713 nr_clusters = blkid_le64(ns->number_of_sectors) / sectors_per_cluster;
714
715 if ((blkid_le64(ns->mft_cluster_location) > nr_clusters) ||
716 (blkid_le64(ns->mft_mirror_cluster_location) > nr_clusters))
717 return 1;
718
719 off = blkid_le64(ns->mft_mirror_cluster_location) *
720 bytes_per_sector * sectors_per_cluster;
721
722 buf_mft = get_buffer(probe, off, mft_record_size);
723 if (!buf_mft)
724 return 1;
725
726 if (memcmp(buf_mft, "FILE", 4))
727 return 1;
728
729 off = blkid_le64(ns->mft_cluster_location) * bytes_per_sector *
730 sectors_per_cluster;
731
732 buf_mft = get_buffer(probe, off, mft_record_size);
733 if (!buf_mft)
734 return 1;
735
736 if (memcmp(buf_mft, "FILE", 4))
737 return 1;
738
739 off += MFT_RECORD_VOLUME * mft_record_size;
740
741 buf_mft = get_buffer(probe, off, mft_record_size);
742 if (!buf_mft)
743 return 1;
744
745 if (memcmp(buf_mft, "FILE", 4))
746 return 1;
747
748 mft = (struct master_file_table_record *) buf_mft;
749
750 attr_off = blkid_le16(mft->attrs_offset);
751 label_str[0] = 0;
752
753 while (1) {
754 attr = (struct file_attribute *) (buf_mft + attr_off);
755 attr_len = blkid_le16(attr->len);
756 attr_type = blkid_le32(attr->type);
757 val_off = blkid_le16(attr->value_offset);
758 val_len = blkid_le32(attr->value_len);
759
760 attr_off += attr_len;
761
762 if ((attr_off > mft_record_size) ||
763 (attr_len == 0))
764 break;
765
766 if (attr_type == MFT_RECORD_ATTR_END)
767 break;
768
769 if (attr_type == MFT_RECORD_ATTR_VOLUME_NAME) {
770 if (val_len > sizeof(label_str))
771 val_len = sizeof(label_str)-1;
772
773 for (i=0, cp=label_str; i < val_len; i+=2,cp++) {
774 val = ((__u8 *) attr) + val_off + i;
775 *cp = val[0];
776 if (val[1])
777 *cp = '?';
778 }
779 *cp = 0;
780 }
781 }
782
783 sprintf(uuid_str, "%016llX", blkid_le64(ns->volume_serial));
784 blkid_set_tag(probe->dev, "UUID", uuid_str, 0);
785 if (label_str[0])
786 blkid_set_tag(probe->dev, "LABEL", label_str, 0);
787 return 0;
788 }
789
790
probe_xfs(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)791 static int probe_xfs(struct blkid_probe *probe,
792 struct blkid_magic *id __BLKID_ATTR((unused)),
793 unsigned char *buf)
794 {
795 struct xfs_super_block *xs;
796 const char *label = 0;
797
798 xs = (struct xfs_super_block *)buf;
799
800 if (strlen(xs->xs_fname))
801 label = xs->xs_fname;
802 blkid_set_tag(probe->dev, "LABEL", label, sizeof(xs->xs_fname));
803 set_uuid(probe->dev, xs->xs_uuid, 0);
804 return 0;
805 }
806
probe_reiserfs(struct blkid_probe * probe,struct blkid_magic * id,unsigned char * buf)807 static int probe_reiserfs(struct blkid_probe *probe,
808 struct blkid_magic *id, unsigned char *buf)
809 {
810 struct reiserfs_super_block *rs = (struct reiserfs_super_block *) buf;
811 unsigned int blocksize;
812 const char *label = 0;
813
814 blocksize = blkid_le16(rs->rs_blocksize);
815
816 /* The blocksize must be at least 1k */
817 if ((blocksize >> 10) == 0)
818 return -BLKID_ERR_PARAM;
819
820 /* If the superblock is inside the journal, we have the wrong one */
821 if (id->bim_kboff/(blocksize>>10) > blkid_le32(rs->rs_journal_block))
822 return -BLKID_ERR_BIG;
823
824 /* LABEL/UUID are only valid for later versions of Reiserfs v3.6. */
825 if (id->bim_magic[6] == '2' || id->bim_magic[6] == '3') {
826 if (strlen(rs->rs_label))
827 label = rs->rs_label;
828 set_uuid(probe->dev, rs->rs_uuid, 0);
829 }
830 blkid_set_tag(probe->dev, "LABEL", label, sizeof(rs->rs_label));
831
832 return 0;
833 }
834
probe_reiserfs4(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)835 static int probe_reiserfs4(struct blkid_probe *probe,
836 struct blkid_magic *id __BLKID_ATTR((unused)),
837 unsigned char *buf)
838 {
839 struct reiser4_super_block *rs4 = (struct reiser4_super_block *) buf;
840 const unsigned char *label = 0;
841
842 if (strlen((char *) rs4->rs4_label))
843 label = rs4->rs4_label;
844 set_uuid(probe->dev, rs4->rs4_uuid, 0);
845 blkid_set_tag(probe->dev, "LABEL", (const char *) label,
846 sizeof(rs4->rs4_label));
847
848 return 0;
849 }
850
probe_jfs(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)851 static int probe_jfs(struct blkid_probe *probe,
852 struct blkid_magic *id __BLKID_ATTR((unused)),
853 unsigned char *buf)
854 {
855 struct jfs_super_block *js;
856 const char *label = 0;
857
858 js = (struct jfs_super_block *)buf;
859
860 if (blkid_le32(js->js_bsize) != (1U << blkid_le16(js->js_l2bsize)))
861 return 1;
862
863 if (blkid_le32(js->js_pbsize) != (1U << blkid_le16(js->js_l2pbsize)))
864 return 1;
865
866 if ((blkid_le16(js->js_l2bsize) - blkid_le16(js->js_l2pbsize)) !=
867 blkid_le16(js->js_l2bfactor))
868 return 1;
869
870 if (strlen((char *) js->js_label))
871 label = (char *) js->js_label;
872 blkid_set_tag(probe->dev, "LABEL", label, sizeof(js->js_label));
873 set_uuid(probe->dev, js->js_uuid, 0);
874 return 0;
875 }
876
probe_zfs(struct blkid_probe * probe __BLKID_ATTR ((unused)),struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf __BLKID_ATTR ((unused)))877 static int probe_zfs(struct blkid_probe *probe __BLKID_ATTR((unused)),
878 struct blkid_magic *id __BLKID_ATTR((unused)),
879 unsigned char *buf __BLKID_ATTR((unused)))
880 {
881 #if 0
882 char *vdev_label;
883 const char *pool_name = 0;
884
885 /* read nvpair data for pool name, pool GUID (complex) */
886 blkid_set_tag(probe->dev, "LABEL", pool_name, sizeof(pool_name));
887 set_uuid(probe->dev, pool_guid, 0);
888 #endif
889 return 0;
890 }
891
probe_luks(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)892 static int probe_luks(struct blkid_probe *probe,
893 struct blkid_magic *id __BLKID_ATTR((unused)),
894 unsigned char *buf)
895 {
896 char uuid[41];
897
898 /* 168 is the offset to the 40 character uuid:
899 * http://luks.endorphin.org/LUKS-on-disk-format.pdf */
900 strncpy(uuid, (char *) buf+168, 40);
901 uuid[40] = 0;
902 blkid_set_tag(probe->dev, "UUID", uuid, 40);
903 return 0;
904 }
905
probe_romfs(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)906 static int probe_romfs(struct blkid_probe *probe,
907 struct blkid_magic *id __BLKID_ATTR((unused)),
908 unsigned char *buf)
909 {
910 struct romfs_super_block *ros;
911 const char *label = 0;
912
913 ros = (struct romfs_super_block *)buf;
914
915 if (strlen((char *) ros->ros_volume))
916 label = (char *) ros->ros_volume;
917 blkid_set_tag(probe->dev, "LABEL", label, 0);
918 return 0;
919 }
920
probe_cramfs(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)921 static int probe_cramfs(struct blkid_probe *probe,
922 struct blkid_magic *id __BLKID_ATTR((unused)),
923 unsigned char *buf)
924 {
925 struct cramfs_super_block *csb;
926 const char *label = 0;
927
928 csb = (struct cramfs_super_block *)buf;
929
930 if (strlen((char *) csb->name))
931 label = (char *) csb->name;
932 blkid_set_tag(probe->dev, "LABEL", label, 0);
933 return 0;
934 }
935
probe_swap0(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf __BLKID_ATTR ((unused)))936 static int probe_swap0(struct blkid_probe *probe,
937 struct blkid_magic *id __BLKID_ATTR((unused)),
938 unsigned char *buf __BLKID_ATTR((unused)))
939 {
940 blkid_set_tag(probe->dev, "UUID", 0, 0);
941 blkid_set_tag(probe->dev, "LABEL", 0, 0);
942 return 0;
943 }
944
probe_swap1(struct blkid_probe * probe,struct blkid_magic * id,unsigned char * buf __BLKID_ATTR ((unused)))945 static int probe_swap1(struct blkid_probe *probe,
946 struct blkid_magic *id,
947 unsigned char *buf __BLKID_ATTR((unused)))
948 {
949 struct swap_id_block *sws;
950
951 probe_swap0(probe, id, buf);
952 /*
953 * Version 1 swap headers are always located at offset of 1024
954 * bytes, although the swap signature itself is located at the
955 * end of the page (which may vary depending on hardware
956 * pagesize).
957 */
958 sws = (struct swap_id_block *) get_buffer(probe, 1024, 1024);
959 if (!sws)
960 return 1;
961
962 /* check for wrong version or zeroed pagecount, for sanity */
963 if (!memcmp(id->bim_magic, "SWAPSPACE2", id->bim_len) &&
964 (sws->sws_version != 1 || sws->sws_lastpage == 0))
965 return 1;
966
967 /* arbitrary sanity check.. is there any garbage down there? */
968 if (sws->sws_pad[32] == 0 && sws->sws_pad[33] == 0) {
969 if (sws->sws_volume[0])
970 blkid_set_tag(probe->dev, "LABEL", sws->sws_volume,
971 sizeof(sws->sws_volume));
972 if (sws->sws_uuid[0])
973 set_uuid(probe->dev, sws->sws_uuid, 0);
974 }
975 return 0;
976 }
977
probe_iso9660(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)978 static int probe_iso9660(struct blkid_probe *probe,
979 struct blkid_magic *id __BLKID_ATTR((unused)),
980 unsigned char *buf)
981 {
982 struct iso_volume_descriptor *iso;
983 const unsigned char *label;
984
985 iso = (struct iso_volume_descriptor *) buf;
986 label = iso->volume_id;
987
988 blkid_set_tag(probe->dev, "LABEL", (const char *) label,
989 figure_label_len(label, 32));
990 return 0;
991 }
992
993
994 static const char
995 *udf_magic[] = { "BEA01", "BOOT2", "CD001", "CDW02", "NSR02",
996 "NSR03", "TEA01", 0 };
997
probe_udf(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf __BLKID_ATTR ((unused)))998 static int probe_udf(struct blkid_probe *probe,
999 struct blkid_magic *id __BLKID_ATTR((unused)),
1000 unsigned char *buf __BLKID_ATTR((unused)))
1001 {
1002 int j, bs;
1003 struct iso_volume_descriptor *isosb;
1004 const char ** m;
1005
1006 /* determine the block size by scanning in 2K increments
1007 (block sizes larger than 2K will be null padded) */
1008 for (bs = 1; bs < 16; bs++) {
1009 isosb = (struct iso_volume_descriptor *)
1010 get_buffer(probe, (blkid_loff_t) bs*2048+32768,
1011 sizeof(*isosb));
1012 if (!isosb)
1013 return 1;
1014 if (isosb->vd_id[0])
1015 break;
1016 }
1017
1018 /* Scan up to another 64 blocks looking for additional VSD's */
1019 for (j = 1; j < 64; j++) {
1020 if (j > 1) {
1021 isosb = (struct iso_volume_descriptor *)
1022 get_buffer(probe, j*bs*2048+32768,
1023 sizeof(*isosb));
1024 if (!isosb)
1025 return 1;
1026 }
1027 /* If we find NSR0x then call it udf:
1028 NSR01 for UDF 1.00
1029 NSR02 for UDF 1.50
1030 NSR03 for UDF 2.00 */
1031 if (!memcmp(isosb->vd_id, "NSR0", 4))
1032 return probe_iso9660(probe, id, buf);
1033 for (m = udf_magic; *m; m++)
1034 if (!memcmp(*m, isosb->vd_id, 5))
1035 break;
1036 if (*m == 0)
1037 return 1;
1038 }
1039 return 1;
1040 }
1041
probe_ocfs(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)1042 static int probe_ocfs(struct blkid_probe *probe,
1043 struct blkid_magic *id __BLKID_ATTR((unused)),
1044 unsigned char *buf)
1045 {
1046 struct ocfs_volume_header ovh;
1047 struct ocfs_volume_label ovl;
1048 __u32 major;
1049
1050 memcpy(&ovh, buf, sizeof(ovh));
1051 memcpy(&ovl, buf+512, sizeof(ovl));
1052
1053 major = ocfsmajor(ovh);
1054 if (major == 1)
1055 blkid_set_tag(probe->dev,"SEC_TYPE","ocfs1",sizeof("ocfs1"));
1056 else if (major >= 9)
1057 blkid_set_tag(probe->dev,"SEC_TYPE","ntocfs",sizeof("ntocfs"));
1058
1059 blkid_set_tag(probe->dev, "LABEL", ovl.label, ocfslabellen(ovl));
1060 blkid_set_tag(probe->dev, "MOUNT", ovh.mount, ocfsmountlen(ovh));
1061 set_uuid(probe->dev, ovl.vol_id, 0);
1062 return 0;
1063 }
1064
probe_ocfs2(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)1065 static int probe_ocfs2(struct blkid_probe *probe,
1066 struct blkid_magic *id __BLKID_ATTR((unused)),
1067 unsigned char *buf)
1068 {
1069 struct ocfs2_super_block *osb;
1070
1071 osb = (struct ocfs2_super_block *)buf;
1072
1073 blkid_set_tag(probe->dev, "LABEL", osb->s_label, sizeof(osb->s_label));
1074 set_uuid(probe->dev, osb->s_uuid, 0);
1075 return 0;
1076 }
1077
probe_oracleasm(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)1078 static int probe_oracleasm(struct blkid_probe *probe,
1079 struct blkid_magic *id __BLKID_ATTR((unused)),
1080 unsigned char *buf)
1081 {
1082 struct oracle_asm_disk_label *dl;
1083
1084 dl = (struct oracle_asm_disk_label *)buf;
1085
1086 blkid_set_tag(probe->dev, "LABEL", dl->dl_id, sizeof(dl->dl_id));
1087 return 0;
1088 }
1089
probe_gfs(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)1090 static int probe_gfs(struct blkid_probe *probe,
1091 struct blkid_magic *id __BLKID_ATTR((unused)),
1092 unsigned char *buf)
1093 {
1094 struct gfs2_sb *sbd;
1095 const char *label = 0;
1096
1097 sbd = (struct gfs2_sb *)buf;
1098
1099 if (blkid_be32(sbd->sb_fs_format) == GFS_FORMAT_FS &&
1100 blkid_be32(sbd->sb_multihost_format) == GFS_FORMAT_MULTI)
1101 {
1102 blkid_set_tag(probe->dev, "UUID", 0, 0);
1103
1104 if (strlen(sbd->sb_locktable))
1105 label = sbd->sb_locktable;
1106 blkid_set_tag(probe->dev, "LABEL", label, sizeof(sbd->sb_locktable));
1107 return 0;
1108 }
1109 return 1;
1110 }
1111
probe_gfs2(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)1112 static int probe_gfs2(struct blkid_probe *probe,
1113 struct blkid_magic *id __BLKID_ATTR((unused)),
1114 unsigned char *buf)
1115 {
1116 struct gfs2_sb *sbd;
1117 const char *label = 0;
1118
1119 sbd = (struct gfs2_sb *)buf;
1120
1121 if (blkid_be32(sbd->sb_fs_format) == GFS2_FORMAT_FS &&
1122 blkid_be32(sbd->sb_multihost_format) == GFS2_FORMAT_MULTI)
1123 {
1124 blkid_set_tag(probe->dev, "UUID", 0, 0);
1125
1126 if (strlen(sbd->sb_locktable))
1127 label = sbd->sb_locktable;
1128 blkid_set_tag(probe->dev, "LABEL", label, sizeof(sbd->sb_locktable));
1129 return 0;
1130 }
1131 return 1;
1132 }
1133
unicode_16be_to_utf8(unsigned char * str,int out_len,const unsigned char * buf,int in_len)1134 static void unicode_16be_to_utf8(unsigned char *str, int out_len,
1135 const unsigned char *buf, int in_len)
1136 {
1137 int i, j;
1138 unsigned int c;
1139
1140 for (i = j = 0; i + 2 <= in_len; i += 2) {
1141 c = (buf[i] << 8) | buf[i+1];
1142 if (c == 0) {
1143 str[j] = '\0';
1144 break;
1145 } else if (c < 0x80) {
1146 if (j+1 >= out_len)
1147 break;
1148 str[j++] = (unsigned char) c;
1149 } else if (c < 0x800) {
1150 if (j+2 >= out_len)
1151 break;
1152 str[j++] = (unsigned char) (0xc0 | (c >> 6));
1153 str[j++] = (unsigned char) (0x80 | (c & 0x3f));
1154 } else {
1155 if (j+3 >= out_len)
1156 break;
1157 str[j++] = (unsigned char) (0xe0 | (c >> 12));
1158 str[j++] = (unsigned char) (0x80 | ((c >> 6) & 0x3f));
1159 str[j++] = (unsigned char) (0x80 | (c & 0x3f));
1160 }
1161 }
1162 str[j] = '\0';
1163 }
1164
unicode_16le_to_utf8(unsigned char * str,int out_len,const unsigned char * buf,int in_len)1165 static void unicode_16le_to_utf8(unsigned char *str, int out_len,
1166 const unsigned char *buf, int in_len)
1167 {
1168 int i, j;
1169 unsigned int c;
1170
1171 for (i = j = 0; i + 2 <= in_len; i += 2) {
1172 c = (buf[i+1] << 8) | buf[i];
1173 if (c == 0) {
1174 str[j] = '\0';
1175 break;
1176 } else if (c < 0x80) {
1177 if (j+1 >= out_len)
1178 break;
1179 str[j++] = (unsigned char) c;
1180 } else if (c < 0x800) {
1181 if (j+2 >= out_len)
1182 break;
1183 str[j++] = (unsigned char) (0xc0 | (c >> 6));
1184 str[j++] = (unsigned char) (0x80 | (c & 0x3f));
1185 } else {
1186 if (j+3 >= out_len)
1187 break;
1188 str[j++] = (unsigned char) (0xe0 | (c >> 12));
1189 str[j++] = (unsigned char) (0x80 | ((c >> 6) & 0x3f));
1190 str[j++] = (unsigned char) (0x80 | (c & 0x3f));
1191 }
1192 }
1193 str[j] = '\0';
1194 }
1195
probe_hfs(struct blkid_probe * probe __BLKID_ATTR ((unused)),struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)1196 static int probe_hfs(struct blkid_probe *probe __BLKID_ATTR((unused)),
1197 struct blkid_magic *id __BLKID_ATTR((unused)),
1198 unsigned char *buf)
1199 {
1200 struct hfs_mdb *hfs = (struct hfs_mdb *)buf;
1201 char uuid_str[17];
1202 __u64 uuid;
1203
1204 if ((memcmp(hfs->embed_sig, "H+", 2) == 0) ||
1205 (memcmp(hfs->embed_sig, "HX", 2) == 0))
1206 return 1; /* Not hfs, but an embedded HFS+ */
1207
1208 memcpy(&uuid, hfs->finder_info.id, 8);
1209 uuid = blkid_le64(uuid);
1210 if (uuid) {
1211 sprintf(uuid_str, "%016llX", uuid);
1212 blkid_set_tag(probe->dev, "UUID", uuid_str, 0);
1213 }
1214 blkid_set_tag(probe->dev, "LABEL", (char *)hfs->label, hfs->label_len);
1215 return 0;
1216 }
1217
1218
1219 #define HFSPLUS_SECTOR_SIZE 512
1220
probe_hfsplus(struct blkid_probe * probe,struct blkid_magic * id,unsigned char * buf)1221 static int probe_hfsplus(struct blkid_probe *probe,
1222 struct blkid_magic *id,
1223 unsigned char *buf)
1224 {
1225 struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT];
1226 struct hfsplus_bnode_descriptor *descr;
1227 struct hfsplus_bheader_record *bnode;
1228 struct hfsplus_catalog_key *key;
1229 struct hfsplus_vol_header *hfsplus;
1230 struct hfs_mdb *sbd = (struct hfs_mdb *) buf;
1231 unsigned int alloc_block_size;
1232 unsigned int alloc_first_block;
1233 unsigned int embed_first_block;
1234 unsigned int off = 0;
1235 unsigned int blocksize;
1236 unsigned int cat_block;
1237 unsigned int ext_block_start;
1238 unsigned int ext_block_count;
1239 unsigned int record_count;
1240 unsigned int leaf_node_head;
1241 unsigned int leaf_node_count;
1242 unsigned int leaf_node_size;
1243 unsigned int leaf_block;
1244 unsigned int label_len;
1245 __u64 leaf_off, uuid;
1246 char uuid_str[17], label[512];
1247 int ext;
1248
1249 /* Check for a HFS+ volume embedded in a HFS volume */
1250 if (memcmp(sbd->signature, "BD", 2) == 0) {
1251 if ((memcmp(sbd->embed_sig, "H+", 2) != 0) &&
1252 (memcmp(sbd->embed_sig, "HX", 2) != 0))
1253 /* This must be an HFS volume, so fail */
1254 return 1;
1255
1256 alloc_block_size = blkid_be32(sbd->al_blk_size);
1257 alloc_first_block = blkid_be16(sbd->al_bl_st);
1258 embed_first_block = blkid_be16(sbd->embed_startblock);
1259 off = (alloc_first_block * 512) +
1260 (embed_first_block * alloc_block_size);
1261 buf = get_buffer(probe, off + (id->bim_kboff * 1024),
1262 sizeof(*sbd));
1263 if (!buf)
1264 return 1;
1265
1266 hfsplus = (struct hfsplus_vol_header *) buf;
1267 }
1268
1269 hfsplus = (struct hfsplus_vol_header *) buf;
1270
1271 if ((memcmp(hfsplus->signature, "H+", 2) != 0) &&
1272 (memcmp(hfsplus->signature, "HX", 2) != 0))
1273 return 1;
1274
1275 memcpy(&uuid, hfsplus->finder_info.id, 8);
1276 uuid = blkid_le64(uuid);
1277 if (uuid) {
1278 sprintf(uuid_str, "%016llX", uuid);
1279 blkid_set_tag(probe->dev, "UUID", uuid_str, 0);
1280 }
1281
1282 blocksize = blkid_be32(hfsplus->blocksize);
1283 if (blocksize < HFSPLUS_SECTOR_SIZE)
1284 return 1;
1285
1286 memcpy(extents, hfsplus->cat_file.extents, sizeof(extents));
1287 cat_block = blkid_be32(extents[0].start_block);
1288
1289 buf = get_buffer(probe, off + ((__u64) cat_block * blocksize), 0x2000);
1290 if (!buf)
1291 return 0;
1292
1293 bnode = (struct hfsplus_bheader_record *)
1294 &buf[sizeof(struct hfsplus_bnode_descriptor)];
1295
1296 leaf_node_head = blkid_be32(bnode->leaf_head);
1297 leaf_node_size = blkid_be16(bnode->node_size);
1298 leaf_node_count = blkid_be32(bnode->leaf_count);
1299 if (leaf_node_count == 0)
1300 return 0;
1301
1302 leaf_block = (leaf_node_head * leaf_node_size) / blocksize;
1303
1304 /* get physical location */
1305 for (ext = 0; ext < HFSPLUS_EXTENT_COUNT; ext++) {
1306 ext_block_start = blkid_be32(extents[ext].start_block);
1307 ext_block_count = blkid_be32(extents[ext].block_count);
1308 if (ext_block_count == 0)
1309 return 0;
1310
1311 /* this is our extent */
1312 if (leaf_block < ext_block_count)
1313 break;
1314
1315 leaf_block -= ext_block_count;
1316 }
1317 if (ext == HFSPLUS_EXTENT_COUNT)
1318 return 0;
1319
1320 leaf_off = (__u64) (ext_block_start + leaf_block) * blocksize;
1321
1322 buf = get_buffer(probe, off + leaf_off, leaf_node_size);
1323 if (!buf)
1324 return 0;
1325
1326 descr = (struct hfsplus_bnode_descriptor *) buf;
1327 record_count = blkid_be16(descr->num_recs);
1328 if (record_count == 0)
1329 return 0;
1330
1331 if (descr->type != HFS_NODE_LEAF)
1332 return 0;
1333
1334 key = (struct hfsplus_catalog_key *)
1335 &buf[sizeof(struct hfsplus_bnode_descriptor)];
1336
1337 if (blkid_be32(key->parent_id) != HFSPLUS_POR_CNID)
1338 return 0;
1339
1340 label_len = blkid_be16(key->unicode_len) * 2;
1341 unicode_16be_to_utf8((unsigned char *)label, sizeof(label),
1342 key->unicode, label_len);
1343 blkid_set_tag(probe->dev, "LABEL", label, 0);
1344 return 0;
1345 }
1346
1347 #define LVM2_LABEL_SIZE 512
lvm2_calc_crc(const void * buf,unsigned int size)1348 static unsigned int lvm2_calc_crc(const void *buf, unsigned int size)
1349 {
1350 static const unsigned int crctab[] = {
1351 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
1352 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
1353 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
1354 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
1355 };
1356 unsigned int i, crc = 0xf597a6cf;
1357 const __u8 *data = (const __u8 *) buf;
1358
1359 for (i = 0; i < size; i++) {
1360 crc ^= *data++;
1361 crc = (crc >> 4) ^ crctab[crc & 0xf];
1362 crc = (crc >> 4) ^ crctab[crc & 0xf];
1363 }
1364 return crc;
1365 }
1366
probe_lvm2(struct blkid_probe * probe,struct blkid_magic * id,unsigned char * buf)1367 static int probe_lvm2(struct blkid_probe *probe,
1368 struct blkid_magic *id,
1369 unsigned char *buf)
1370 {
1371 int sector = (id->bim_kboff) << 1;
1372 struct lvm2_pv_label_header *label= (struct lvm2_pv_label_header *)buf;
1373 char *p, *q, uuid[40];
1374 unsigned int i, b;
1375
1376 /* buf is at 0k or 1k offset; find label inside */
1377 if (memcmp(buf, "LABELONE", 8) == 0) {
1378 label = (struct lvm2_pv_label_header *)buf;
1379 } else if (memcmp(buf + 512, "LABELONE", 8) == 0) {
1380 label = (struct lvm2_pv_label_header *)(buf + 512);
1381 sector++;
1382 } else {
1383 return 1;
1384 }
1385
1386 if (blkid_le64(label->sector_xl) != (unsigned) sector) {
1387 DBG(DEBUG_PROBE,
1388 printf("LVM2: label for sector %llu found at sector %d\n",
1389 blkid_le64(label->sector_xl), sector));
1390 return 1;
1391 }
1392
1393 if (lvm2_calc_crc(&label->offset_xl, LVM2_LABEL_SIZE -
1394 ((char *)&label->offset_xl - (char *)label)) !=
1395 blkid_le32(label->crc_xl)) {
1396 DBG(DEBUG_PROBE,
1397 printf("LVM2: label checksum incorrect at sector %d\n",
1398 sector));
1399 return 1;
1400 }
1401
1402 for (i=0, b=1, p=uuid, q= (char *) label->pv_uuid; i < LVM2_ID_LEN;
1403 i++, b <<= 1) {
1404 if (b & 0x4444440)
1405 *p++ = '-';
1406 *p++ = *q++;
1407 }
1408
1409 blkid_set_tag(probe->dev, "UUID", uuid, LVM2_ID_LEN+6);
1410
1411 return 0;
1412 }
1413
probe_btrfs(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)1414 static int probe_btrfs(struct blkid_probe *probe,
1415 struct blkid_magic *id __BLKID_ATTR((unused)),
1416 unsigned char *buf)
1417 {
1418 struct btrfs_super_block *bs;
1419 const char *label = 0;
1420
1421 bs = (struct btrfs_super_block *)buf;
1422
1423 if (strlen(bs->label))
1424 label = bs->label;
1425 blkid_set_tag(probe->dev, "LABEL", label, sizeof(bs->label));
1426 set_uuid(probe->dev, bs->fsid, 0);
1427 return 0;
1428 }
1429
probe_f2fs(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)1430 static int probe_f2fs(struct blkid_probe *probe,
1431 struct blkid_magic *id __BLKID_ATTR((unused)),
1432 unsigned char *buf)
1433 {
1434 struct f2fs_super_block *bs;
1435
1436 bs = (struct f2fs_super_block *)buf;
1437 set_uuid(probe->dev, bs->uuid, 0);
1438 return 0;
1439 }
1440
exfat_block_to_offset(const struct exfat_super_block * sb,uint64_t block)1441 static uint64_t exfat_block_to_offset(const struct exfat_super_block *sb,
1442 uint64_t block)
1443 {
1444 return block << sb->block_bits;
1445 }
1446
exfat_cluster_to_block(const struct exfat_super_block * sb,uint32_t cluster)1447 static uint64_t exfat_cluster_to_block(const struct exfat_super_block *sb,
1448 uint32_t cluster)
1449 {
1450 return sb->cluster_block_start +
1451 ((uint64_t)(cluster - EXFAT_FIRST_DATA_CLUSTER) << sb->bpc_bits);
1452 }
1453
exfat_cluster_to_offset(const struct exfat_super_block * sb,uint32_t cluster)1454 static uint64_t exfat_cluster_to_offset(const struct exfat_super_block *sb,
1455 uint32_t cluster)
1456 {
1457 return exfat_block_to_offset(sb, exfat_cluster_to_block(sb, cluster));
1458 }
1459
exfat_next_cluster(struct blkid_probe * probe,const struct exfat_super_block * sb,uint32_t cluster)1460 static uint32_t exfat_next_cluster(struct blkid_probe *probe,
1461 const struct exfat_super_block *sb,
1462 uint32_t cluster)
1463 {
1464 uint32_t *next;
1465 uint64_t offset;
1466
1467 offset = exfat_block_to_offset(sb, sb->fat_block_start)
1468 + (uint64_t) cluster * sizeof (cluster);
1469 next = (uint32_t *)get_buffer(probe, offset, sizeof (uint32_t));
1470
1471 return next ? *next : 0;
1472 }
1473
find_exfat_entry_label(struct blkid_probe * probe,const struct exfat_super_block * sb)1474 static struct exfat_entry_label *find_exfat_entry_label(
1475 struct blkid_probe *probe, const struct exfat_super_block *sb)
1476 {
1477 uint32_t cluster = sb->rootdir_cluster;
1478 uint64_t offset = exfat_cluster_to_offset(sb, cluster);
1479 uint8_t *entry;
1480 const size_t max_iter = 10000;
1481 size_t i = 0;
1482
1483 for (; i < max_iter; ++i) {
1484 entry = (uint8_t *)get_buffer(probe, offset, EXFAT_ENTRY_SIZE);
1485 if (!entry)
1486 return NULL;
1487 if (entry[0] == EXFAT_ENTRY_EOD)
1488 return NULL;
1489 if (entry[0] == EXFAT_ENTRY_LABEL)
1490 return (struct exfat_entry_label*) entry;
1491
1492 offset += EXFAT_ENTRY_SIZE;
1493 if (offset % CLUSTER_SIZE(sb) == 0) {
1494 cluster = exfat_next_cluster(probe, sb, cluster);
1495 if (cluster < EXFAT_FIRST_DATA_CLUSTER)
1496 return NULL;
1497 if (cluster > EXFAT_LAST_DATA_CLUSTER)
1498 return NULL;
1499 offset = exfat_cluster_to_offset(sb, cluster);
1500 }
1501 }
1502
1503 return NULL;
1504 }
1505
probe_exfat(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)1506 static int probe_exfat(struct blkid_probe *probe,
1507 struct blkid_magic *id __BLKID_ATTR((unused)),
1508 unsigned char *buf)
1509 {
1510 struct exfat_super_block *sb;
1511 struct exfat_entry_label *label;
1512 char uuid[40];
1513
1514 sb = (struct exfat_super_block *)buf;
1515 if (!sb || CLUSTER_SIZE(sb) == 0) {
1516 DBG(DEBUG_PROBE, printf("bad exfat superblock.\n"));
1517 return errno ? - errno : 1;
1518 }
1519
1520 label = find_exfat_entry_label(probe, sb);
1521 if (label) {
1522 unsigned char utf8_label[128];
1523 unicode_16le_to_utf8(utf8_label, sizeof(utf8_label), label->name, label->length * 2);
1524 blkid_set_tag(probe->dev, "LABEL", (char *) utf8_label, 0);
1525 } else {
1526 blkid_set_tag(probe->dev, "LABEL", "disk", 4);
1527 }
1528
1529 memset(uuid, 0, sizeof (uuid));
1530 snprintf(uuid, sizeof (uuid), "%02hhX%02hhX-%02hhX%02hhX",
1531 sb->volume_serial[3], sb->volume_serial[2],
1532 sb->volume_serial[1], sb->volume_serial[0]);
1533 blkid_set_tag(probe->dev, "UUID", uuid, strlen(uuid));
1534
1535 return 0;
1536 }
1537
1538 /*
1539 * Various filesystem magics that we can check for. Note that kboff and
1540 * sboff are in kilobytes and bytes respectively. All magics are in
1541 * byte strings so we don't worry about endian issues.
1542 */
1543 static struct blkid_magic type_array[] = {
1544 /* type kboff sboff len magic probe */
1545 { "oracleasm", 0, 32, 8, "ORCLDISK", probe_oracleasm },
1546 { "ntfs", 0, 3, 8, "NTFS ", probe_ntfs },
1547 { "jbd", 1, 0x38, 2, "\123\357", probe_jbd },
1548 { "ext4dev", 1, 0x38, 2, "\123\357", probe_ext4dev },
1549 { "ext4", 1, 0x38, 2, "\123\357", probe_ext4 },
1550 { "ext3", 1, 0x38, 2, "\123\357", probe_ext3 },
1551 { "ext2", 1, 0x38, 2, "\123\357", probe_ext2 },
1552 { "reiserfs", 8, 0x34, 8, "ReIsErFs", probe_reiserfs },
1553 { "reiserfs", 64, 0x34, 9, "ReIsEr2Fs", probe_reiserfs },
1554 { "reiserfs", 64, 0x34, 9, "ReIsEr3Fs", probe_reiserfs },
1555 { "reiserfs", 64, 0x34, 8, "ReIsErFs", probe_reiserfs },
1556 { "reiserfs", 8, 20, 8, "ReIsErFs", probe_reiserfs },
1557 { "reiser4", 64, 0, 7, "ReIsEr4", probe_reiserfs4 },
1558 { "gfs2", 64, 0, 4, "\x01\x16\x19\x70", probe_gfs2 },
1559 { "gfs", 64, 0, 4, "\x01\x16\x19\x70", probe_gfs },
1560 { "vfat", 0, 0x52, 5, "MSWIN", probe_fat },
1561 { "vfat", 0, 0x52, 8, "FAT32 ", probe_fat },
1562 { "vfat", 0, 0x36, 5, "MSDOS", probe_fat },
1563 { "vfat", 0, 0x36, 8, "FAT16 ", probe_fat },
1564 { "vfat", 0, 0x36, 8, "FAT12 ", probe_fat },
1565 { "vfat", 0, 0, 1, "\353", probe_fat_nomagic },
1566 { "vfat", 0, 0, 1, "\351", probe_fat_nomagic },
1567 { "vfat", 0, 0x1fe, 2, "\125\252", probe_fat_nomagic },
1568 { "minix", 1, 0x10, 2, "\177\023", 0 },
1569 { "minix", 1, 0x10, 2, "\217\023", 0 },
1570 { "minix", 1, 0x10, 2, "\150\044", 0 },
1571 { "minix", 1, 0x10, 2, "\170\044", 0 },
1572 { "vxfs", 1, 0, 4, "\365\374\001\245", 0 },
1573 { "xfs", 0, 0, 4, "XFSB", probe_xfs },
1574 { "romfs", 0, 0, 8, "-rom1fs-", probe_romfs },
1575 { "bfs", 0, 0, 4, "\316\372\173\033", 0 },
1576 { "cramfs", 0, 0, 4, "E=\315\050", probe_cramfs },
1577 { "qnx4", 0, 4, 6, "QNX4FS", 0 },
1578 { "udf", 32, 1, 5, "BEA01", probe_udf },
1579 { "udf", 32, 1, 5, "BOOT2", probe_udf },
1580 { "udf", 32, 1, 5, "CD001", probe_udf },
1581 { "udf", 32, 1, 5, "CDW02", probe_udf },
1582 { "udf", 32, 1, 5, "NSR02", probe_udf },
1583 { "udf", 32, 1, 5, "NSR03", probe_udf },
1584 { "udf", 32, 1, 5, "TEA01", probe_udf },
1585 { "iso9660", 32, 1, 5, "CD001", probe_iso9660 },
1586 { "iso9660", 32, 9, 5, "CDROM", probe_iso9660 },
1587 { "jfs", 32, 0, 4, "JFS1", probe_jfs },
1588 /* ZFS has 128 root blocks (#4 is the first used), check only 6 of them */
1589 { "zfs", 128, 0, 8, "\0\0\0\0\0\xba\xb1\x0c", probe_zfs },
1590 { "zfs", 128, 0, 8, "\x0c\xb1\xba\0\0\0\0\0", probe_zfs },
1591 { "zfs", 132, 0, 8, "\0\0\0\0\0\xba\xb1\x0c", probe_zfs },
1592 { "zfs", 132, 0, 8, "\x0c\xb1\xba\0\0\0\0\0", probe_zfs },
1593 { "zfs", 136, 0, 8, "\0\0\0\0\0\xba\xb1\x0c", probe_zfs },
1594 { "zfs", 136, 0, 8, "\x0c\xb1\xba\0\0\0\0\0", probe_zfs },
1595 { "zfs", 384, 0, 8, "\0\0\0\0\0\xba\xb1\x0c", probe_zfs },
1596 { "zfs", 384, 0, 8, "\x0c\xb1\xba\0\0\0\0\0", probe_zfs },
1597 { "zfs", 388, 0, 8, "\0\0\0\0\0\xba\xb1\x0c", probe_zfs },
1598 { "zfs", 388, 0, 8, "\x0c\xb1\xba\0\0\0\0\0", probe_zfs },
1599 { "zfs", 392, 0, 8, "\0\0\0\0\0\xba\xb1\x0c", probe_zfs },
1600 { "zfs", 392, 0, 8, "\x0c\xb1\xba\0\0\0\0\0", probe_zfs },
1601 { "hfsplus", 1, 0, 2, "BD", probe_hfsplus },
1602 { "hfsplus", 1, 0, 2, "H+", probe_hfsplus },
1603 { "hfsplus", 1, 0, 2, "HX", probe_hfsplus },
1604 { "hfs", 1, 0, 2, "BD", probe_hfs },
1605 { "ufs", 8, 0x55c, 4, "T\031\001\000", 0 },
1606 { "hpfs", 8, 0, 4, "I\350\225\371", 0 },
1607 { "sysv", 0, 0x3f8, 4, "\020~\030\375", 0 },
1608 { "swap", 0, 0xff6, 10, "SWAP-SPACE", probe_swap0 },
1609 { "swap", 0, 0xff6, 10, "SWAPSPACE2", probe_swap1 },
1610 { "swsuspend", 0, 0xff6, 9, "S1SUSPEND", probe_swap1 },
1611 { "swsuspend", 0, 0xff6, 9, "S2SUSPEND", probe_swap1 },
1612 { "swsuspend", 0, 0xff6, 9, "ULSUSPEND", probe_swap1 },
1613 { "swap", 0, 0x1ff6, 10, "SWAP-SPACE", probe_swap0 },
1614 { "swap", 0, 0x1ff6, 10, "SWAPSPACE2", probe_swap1 },
1615 { "swsuspend", 0, 0x1ff6, 9, "S1SUSPEND", probe_swap1 },
1616 { "swsuspend", 0, 0x1ff6, 9, "S2SUSPEND", probe_swap1 },
1617 { "swsuspend", 0, 0x1ff6, 9, "ULSUSPEND", probe_swap1 },
1618 { "swap", 0, 0x3ff6, 10, "SWAP-SPACE", probe_swap0 },
1619 { "swap", 0, 0x3ff6, 10, "SWAPSPACE2", probe_swap1 },
1620 { "swsuspend", 0, 0x3ff6, 9, "S1SUSPEND", probe_swap1 },
1621 { "swsuspend", 0, 0x3ff6, 9, "S2SUSPEND", probe_swap1 },
1622 { "swsuspend", 0, 0x3ff6, 9, "ULSUSPEND", probe_swap1 },
1623 { "swap", 0, 0x7ff6, 10, "SWAP-SPACE", probe_swap0 },
1624 { "swap", 0, 0x7ff6, 10, "SWAPSPACE2", probe_swap1 },
1625 { "swsuspend", 0, 0x7ff6, 9, "S1SUSPEND", probe_swap1 },
1626 { "swsuspend", 0, 0x7ff6, 9, "S2SUSPEND", probe_swap1 },
1627 { "swsuspend", 0, 0x7ff6, 9, "ULSUSPEND", probe_swap1 },
1628 { "swap", 0, 0xfff6, 10, "SWAP-SPACE", probe_swap0 },
1629 { "swap", 0, 0xfff6, 10, "SWAPSPACE2", probe_swap1 },
1630 { "swsuspend", 0, 0xfff6, 9, "S1SUSPEND", probe_swap1 },
1631 { "swsuspend", 0, 0xfff6, 9, "S2SUSPEND", probe_swap1 },
1632 { "swsuspend", 0, 0xfff6, 9, "ULSUSPEND", probe_swap1 },
1633 { "ocfs", 0, 8, 9, "OracleCFS", probe_ocfs },
1634 { "ocfs2", 1, 0, 6, "OCFSV2", probe_ocfs2 },
1635 { "ocfs2", 2, 0, 6, "OCFSV2", probe_ocfs2 },
1636 { "ocfs2", 4, 0, 6, "OCFSV2", probe_ocfs2 },
1637 { "ocfs2", 8, 0, 6, "OCFSV2", probe_ocfs2 },
1638 { "crypt_LUKS", 0, 0, 6, "LUKS\xba\xbe", probe_luks },
1639 { "squashfs", 0, 0, 4, "sqsh", 0 },
1640 { "squashfs", 0, 0, 4, "hsqs", 0 },
1641 { "lvm2pv", 0, 0x218, 8, "LVM2 001", probe_lvm2 },
1642 { "lvm2pv", 0, 0x018, 8, "LVM2 001", probe_lvm2 },
1643 { "lvm2pv", 1, 0x018, 8, "LVM2 001", probe_lvm2 },
1644 { "lvm2pv", 1, 0x218, 8, "LVM2 001", probe_lvm2 },
1645 { "btrfs", 64, 0x40, 8, "_BHRfS_M", probe_btrfs },
1646 { "f2fs", 1, 0, 4, "\x10\x20\xf5\xf2", probe_f2fs },
1647 { "exfat", 0, 3, 8, "EXFAT ", probe_exfat },
1648 { NULL, 0, 0, 0, NULL, NULL }
1649 };
1650
1651 /*
1652 * Verify that the data in dev is consistent with what is on the actual
1653 * block device (using the devname field only). Normally this will be
1654 * called when finding items in the cache, but for long running processes
1655 * is also desirable to revalidate an item before use.
1656 *
1657 * If we are unable to revalidate the data, we return the old data and
1658 * do not set the BLKID_BID_FL_VERIFIED flag on it.
1659 */
blkid_verify(blkid_cache cache,blkid_dev dev)1660 blkid_dev blkid_verify(blkid_cache cache, blkid_dev dev)
1661 {
1662 struct blkid_magic *id;
1663 struct blkid_probe probe;
1664 blkid_tag_iterate iter;
1665 unsigned char *buf;
1666 const char *type, *value;
1667 struct stat st;
1668 time_t now;
1669 double diff;
1670 int idx;
1671
1672 if (!dev)
1673 return NULL;
1674
1675 now = time(0);
1676 diff = difftime(now, dev->bid_time);
1677
1678 if (stat(dev->bid_name, &st) < 0) {
1679 DBG(DEBUG_PROBE,
1680 printf("blkid_verify: error %s (%d) while "
1681 "trying to stat %s\n", strerror(errno), errno,
1682 dev->bid_name));
1683 open_err:
1684 if ((errno == EPERM) || (errno == EACCES) || (errno == ENOENT)) {
1685 /* We don't have read permission, just return cache data. */
1686 DBG(DEBUG_PROBE, printf("returning unverified data for %s\n",
1687 dev->bid_name));
1688 return dev;
1689 }
1690 blkid_free_dev(dev);
1691 return NULL;
1692 }
1693
1694 if ((now >= dev->bid_time) &&
1695 (st.st_mtime <= dev->bid_time) &&
1696 ((diff < BLKID_PROBE_MIN) ||
1697 (dev->bid_flags & BLKID_BID_FL_VERIFIED &&
1698 diff < BLKID_PROBE_INTERVAL)))
1699 return dev;
1700
1701 DBG(DEBUG_PROBE,
1702 printf("need to revalidate %s (cache time %lu, stat time %lu,\n\t"
1703 "time since last check %lu)\n",
1704 dev->bid_name, (unsigned long)dev->bid_time,
1705 (unsigned long)st.st_mtime, (unsigned long)diff));
1706
1707 if ((probe.fd = open(dev->bid_name, O_RDONLY)) < 0) {
1708 DBG(DEBUG_PROBE, printf("blkid_verify: error %s (%d) while "
1709 "opening %s\n", strerror(errno), errno,
1710 dev->bid_name));
1711 goto open_err;
1712 }
1713
1714 probe.cache = cache;
1715 probe.dev = dev;
1716 probe.sbbuf = 0;
1717 probe.buf = 0;
1718 probe.buf_max = 0;
1719
1720 /*
1721 * Iterate over the type array. If we already know the type,
1722 * then try that first. If it doesn't work, then blow away
1723 * the type information, and try again.
1724 *
1725 */
1726 try_again:
1727 type = 0;
1728 if (!dev->bid_type || !strcmp(dev->bid_type, "mdraid")) {
1729 uuid_t uuid;
1730
1731 if (check_mdraid(probe.fd, uuid) == 0) {
1732 set_uuid(dev, uuid, 0);
1733 type = "mdraid";
1734 goto found_type;
1735 }
1736 }
1737 for (id = type_array; id->bim_type; id++) {
1738 if (dev->bid_type &&
1739 strcmp(id->bim_type, dev->bid_type))
1740 continue;
1741
1742 idx = id->bim_kboff + (id->bim_sboff >> 10);
1743 buf = get_buffer(&probe, (__u64) idx << 10, 1024);
1744 if (!buf)
1745 continue;
1746
1747 if (memcmp(id->bim_magic, buf + (id->bim_sboff & 0x3ff),
1748 id->bim_len))
1749 continue;
1750
1751 if ((id->bim_probe == NULL) ||
1752 (id->bim_probe(&probe, id, buf) == 0)) {
1753 type = id->bim_type;
1754 goto found_type;
1755 }
1756 }
1757
1758 if (!id->bim_type && dev->bid_type) {
1759 /*
1760 * Zap the device filesystem information and try again
1761 */
1762 DBG(DEBUG_PROBE,
1763 printf("previous fs type %s not valid, "
1764 "trying full probe\n", dev->bid_type));
1765 iter = blkid_tag_iterate_begin(dev);
1766 while (blkid_tag_next(iter, &type, &value) == 0)
1767 blkid_set_tag(dev, type, 0, 0);
1768 blkid_tag_iterate_end(iter);
1769 goto try_again;
1770 }
1771
1772 if (!dev->bid_type) {
1773 blkid_free_dev(dev);
1774 dev = 0;
1775 goto found_type;
1776 }
1777
1778 found_type:
1779 if (dev && type) {
1780 dev->bid_devno = st.st_rdev;
1781 dev->bid_time = time(0);
1782 dev->bid_flags |= BLKID_BID_FL_VERIFIED;
1783 cache->bic_flags |= BLKID_BIC_FL_CHANGED;
1784
1785 blkid_set_tag(dev, "TYPE", type, 0);
1786
1787 DBG(DEBUG_PROBE, printf("%s: devno 0x%04llx, type %s\n",
1788 dev->bid_name, (long long)st.st_rdev, type));
1789 }
1790
1791 free(probe.sbbuf);
1792 free(probe.buf);
1793 if (probe.fd >= 0)
1794 close(probe.fd);
1795
1796 return dev;
1797 }
1798
blkid_known_fstype(const char * fstype)1799 int blkid_known_fstype(const char *fstype)
1800 {
1801 struct blkid_magic *id;
1802
1803 for (id = type_array; id->bim_type; id++) {
1804 if (strcmp(fstype, id->bim_type) == 0)
1805 return 1;
1806 }
1807 return 0;
1808 }
1809
1810 #ifdef TEST_PROGRAM
main(int argc,char ** argv)1811 int main(int argc, char **argv)
1812 {
1813 blkid_dev dev;
1814 blkid_cache cache;
1815 int ret;
1816
1817 if (argc != 2) {
1818 fprintf(stderr, "Usage: %s device\n"
1819 "Probe a single device to determine type\n", argv[0]);
1820 exit(1);
1821 }
1822 if ((ret = blkid_get_cache(&cache, "/dev/null")) != 0) {
1823 fprintf(stderr, "%s: error creating cache (%d)\n",
1824 argv[0], ret);
1825 exit(1);
1826 }
1827 dev = blkid_get_dev(cache, argv[1], BLKID_DEV_NORMAL);
1828 if (!dev) {
1829 printf("%s: %s has an unsupported type\n", argv[0], argv[1]);
1830 return (1);
1831 }
1832 printf("TYPE='%s'\n", dev->bid_type ? dev->bid_type : "(null)");
1833 if (dev->bid_label)
1834 printf("LABEL='%s'\n", dev->bid_label);
1835 if (dev->bid_uuid)
1836 printf("UUID='%s'\n", dev->bid_uuid);
1837
1838 blkid_free_dev(dev);
1839 return (0);
1840 }
1841 #endif
1842