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Fix gcc -Wall warnings for lib/blkid/probe.c
[thirdparty/e2fsprogs.git] / lib / blkid / probe.c
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 <kay.sievers@vrfy.org>
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 <ctype.h>
22 #include <sys/types.h>
23 #ifdef HAVE_SYS_STAT_H
24 #include <sys/stat.h>
25 #endif
26 #ifdef HAVE_SYS_MKDEV_H
27 #include <sys/mkdev.h>
28 #endif
29 #include <sys/utsname.h>
30 #ifdef HAVE_ERRNO_H
31 #include <errno.h>
32 #endif
33 #include "blkidP.h"
34 #include "uuid/uuid.h"
35 #include "probe.h"
36
37 static int figure_label_len(const unsigned char *label, int len)
38 {
39 const unsigned char *end = label + len - 1;
40
41 while ((*end == ' ' || *end == 0) && end >= label)
42 --end;
43 if (end >= label) {
44 label = label;
45 return end - label + 1;
46 }
47 return 0;
48 }
49
50 static unsigned char *get_buffer(struct blkid_probe *pr,
51 blkid_loff_t off, size_t len)
52 {
53 ssize_t ret_read;
54 unsigned char *newbuf;
55
56 if (off + len <= SB_BUFFER_SIZE) {
57 if (!pr->sbbuf) {
58 pr->sbbuf = malloc(SB_BUFFER_SIZE);
59 if (!pr->sbbuf)
60 return NULL;
61 if (lseek(pr->fd, 0, SEEK_SET) < 0)
62 return NULL;
63 ret_read = read(pr->fd, pr->sbbuf, SB_BUFFER_SIZE);
64 if (ret_read < 0)
65 ret_read = 0;
66 pr->sb_valid = ret_read;
67 }
68 if (off+len > pr->sb_valid)
69 return NULL;
70 return pr->sbbuf + off;
71 } else {
72 if (len > pr->buf_max) {
73 newbuf = realloc(pr->buf, len);
74 if (newbuf == NULL)
75 return NULL;
76 pr->buf = newbuf;
77 pr->buf_max = len;
78 }
79 if (blkid_llseek(pr->fd, off, SEEK_SET) < 0)
80 return NULL;
81 ret_read = read(pr->fd, pr->buf, len);
82 if (ret_read != (ssize_t) len)
83 return NULL;
84 return pr->buf;
85 }
86 }
87
88
89 /*
90 * This is a special case code to check for an MDRAID device. We do
91 * this special since it requires checking for a superblock at the end
92 * of the device.
93 */
94 static int check_mdraid(int fd, unsigned char *ret_uuid)
95 {
96 struct mdp_superblock_s *md;
97 blkid_loff_t offset;
98 char buf[4096];
99
100 if (fd < 0)
101 return -BLKID_ERR_PARAM;
102
103 offset = (blkid_get_dev_size(fd) & ~((blkid_loff_t)65535)) - 65536;
104
105 if (blkid_llseek(fd, offset, 0) < 0 ||
106 read(fd, buf, 4096) != 4096)
107 return -BLKID_ERR_IO;
108
109 /* Check for magic number */
110 if (memcmp("\251+N\374", buf, 4) && memcmp("\374N+\251", buf, 4))
111 return -BLKID_ERR_PARAM;
112
113 if (!ret_uuid)
114 return 0;
115 *ret_uuid = 0;
116
117 /* The MD UUID is not contiguous in the superblock, make it so */
118 md = (struct mdp_superblock_s *)buf;
119 if (md->set_uuid0 || md->set_uuid1 || md->set_uuid2 || md->set_uuid3) {
120 memcpy(ret_uuid, &md->set_uuid0, 4);
121 memcpy(ret_uuid + 4, &md->set_uuid1, 12);
122 }
123 return 0;
124 }
125
126 static void set_uuid(blkid_dev dev, uuid_t uuid, const char *tag)
127 {
128 char str[37];
129
130 if (!uuid_is_null(uuid)) {
131 uuid_unparse(uuid, str);
132 blkid_set_tag(dev, tag ? tag : "UUID", str, sizeof(str));
133 }
134 }
135
136 static void get_ext2_info(blkid_dev dev, struct blkid_magic *id,
137 unsigned char *buf)
138 {
139 struct ext2_super_block *es = (struct ext2_super_block *) buf;
140 const char *label = 0;
141
142 DBG(DEBUG_PROBE, printf("ext2_sb.compat = %08X:%08X:%08X\n",
143 blkid_le32(es->s_feature_compat),
144 blkid_le32(es->s_feature_incompat),
145 blkid_le32(es->s_feature_ro_compat)));
146
147 if (strlen(es->s_volume_name))
148 label = es->s_volume_name;
149 blkid_set_tag(dev, "LABEL", label, sizeof(es->s_volume_name));
150
151 set_uuid(dev, es->s_uuid, 0);
152
153 if ((es->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
154 !uuid_is_null(es->s_journal_uuid))
155 set_uuid(dev, es->s_journal_uuid, "EXT_JOURNAL");
156
157 if (strcmp(id->bim_type, "ext2") &&
158 ((blkid_le32(es->s_feature_incompat) &
159 EXT2_FEATURE_INCOMPAT_UNSUPPORTED) == 0))
160 blkid_set_tag(dev, "SEC_TYPE", "ext2", sizeof("ext2"));
161 }
162
163 /*
164 * Check to see if a filesystem is in /proc/filesystems.
165 * Returns 1 if found, 0 if not
166 */
167 static int fs_proc_check(const char *fs_name)
168 {
169 FILE *f;
170 char buf[80], *cp, *t;
171
172 f = fopen("/proc/filesystems", "r");
173 if (!f)
174 return (0);
175 while (!feof(f)) {
176 if (!fgets(buf, sizeof(buf), f))
177 break;
178 cp = buf;
179 if (!isspace(*cp)) {
180 while (*cp && !isspace(*cp))
181 cp++;
182 }
183 while (*cp && isspace(*cp))
184 cp++;
185 if ((t = strchr(cp, '\n')) != NULL)
186 *t = 0;
187 if ((t = strchr(cp, '\t')) != NULL)
188 *t = 0;
189 if ((t = strchr(cp, ' ')) != NULL)
190 *t = 0;
191 if (!strcmp(fs_name, cp)) {
192 fclose(f);
193 return (1);
194 }
195 }
196 fclose(f);
197 return (0);
198 }
199
200 /*
201 * Check to see if a filesystem is available as a module
202 * Returns 1 if found, 0 if not
203 */
204 static int check_for_modules(const char *fs_name)
205 {
206 struct utsname uts;
207 FILE *f;
208 char buf[1024], *cp, *t;
209 int i;
210
211 if (uname(&uts))
212 return (0);
213 snprintf(buf, sizeof(buf), "/lib/modules/%s/modules.dep", uts.release);
214
215 f = fopen(buf, "r");
216 if (!f)
217 return (0);
218 while (!feof(f)) {
219 if (!fgets(buf, sizeof(buf), f))
220 break;
221 if ((cp = strchr(buf, ':')) != NULL)
222 *cp = 0;
223 else
224 continue;
225 if ((cp = strrchr(buf, '/')) != NULL)
226 cp++;
227 i = strlen(cp);
228 if (i > 3) {
229 t = cp + i - 3;
230 if (!strcmp(t, ".ko"))
231 *t = 0;
232 }
233 if (!strcmp(cp, fs_name))
234 return (1);
235 }
236 fclose(f);
237 return (0);
238 }
239
240 static int system_supports_ext4(void)
241 {
242 static time_t last_check = 0;
243 static int ret = -1;
244 time_t now = time(0);
245
246 if (ret != -1 || (last_check - now) < 5)
247 return ret;
248 last_check = now;
249 ret = (fs_proc_check("ext4") || check_for_modules("ext4"));
250 return ret;
251 }
252
253 static int system_supports_ext4dev(void)
254 {
255 static time_t last_check = 0;
256 static int ret = -1;
257 time_t now = time(0);
258
259 if (ret != -1 || (last_check - now) < 5)
260 return ret;
261 last_check = now;
262 ret = (fs_proc_check("ext4dev") || check_for_modules("ext4dev"));
263 return ret;
264 }
265
266 static int probe_ext4dev(struct blkid_probe *probe,
267 struct blkid_magic *id,
268 unsigned char *buf)
269 {
270 struct ext2_super_block *es;
271 es = (struct ext2_super_block *)buf;
272
273 /* Distinguish from jbd */
274 if (blkid_le32(es->s_feature_incompat) &
275 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)
276 return -BLKID_ERR_PARAM;
277
278 /* ext4dev requires a journal */
279 if (!(blkid_le32(es->s_feature_compat) &
280 EXT3_FEATURE_COMPAT_HAS_JOURNAL))
281 return -BLKID_ERR_PARAM;
282
283 /*
284 * If the filesystem is marked as OK for use by in-development
285 * filesystem code, but ext4dev is not supported, and ext4 is,
286 * then don't call ourselves ext4dev, since we should be
287 * detected as ext4 in that case.
288 *
289 * If the filesystem is marked as in use by production
290 * filesystem, then it can only be used by ext4 and NOT by
291 * ext4dev, so always disclaim we are ext4dev in that case.
292 */
293 if (blkid_le32(es->s_flags) & EXT2_FLAGS_TEST_FILESYS) {
294 if (!system_supports_ext4dev() && system_supports_ext4())
295 return -BLKID_ERR_PARAM;
296 } else
297 return -BLKID_ERR_PARAM;
298
299 get_ext2_info(probe->dev, id, buf);
300 return 0;
301 }
302
303 static int probe_ext4(struct blkid_probe *probe, struct blkid_magic *id,
304 unsigned char *buf)
305 {
306 struct ext2_super_block *es;
307 es = (struct ext2_super_block *)buf;
308
309 /* Distinguish from jbd */
310 if (blkid_le32(es->s_feature_incompat) &
311 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)
312 return -BLKID_ERR_PARAM;
313
314 /* ext4 requires journal */
315 if (!(blkid_le32(es->s_feature_compat) &
316 EXT3_FEATURE_COMPAT_HAS_JOURNAL))
317 return -BLKID_ERR_PARAM;
318
319 /* Ext4 has at least one feature which ext3 doesn't understand */
320 if (!(blkid_le32(es->s_feature_ro_compat) &
321 EXT3_FEATURE_RO_COMPAT_UNSUPPORTED) &&
322 !(blkid_le32(es->s_feature_incompat) &
323 EXT3_FEATURE_INCOMPAT_UNSUPPORTED))
324 return -BLKID_ERR_PARAM;
325
326 /*
327 * If the filesystem is a OK for use by in-development
328 * filesystem code, and ext4dev is supported or ext4 is not
329 * supported, then don't call ourselves ext4, so we can redo
330 * the detection and mark the filesystem as ext4dev.
331 *
332 * If the filesystem is marked as in use by production
333 * filesystem, then it can only be used by ext4 and NOT by
334 * ext4dev.
335 */
336 if (blkid_le32(es->s_flags) & EXT2_FLAGS_TEST_FILESYS) {
337 if (system_supports_ext4dev() || !system_supports_ext4())
338 return -BLKID_ERR_PARAM;
339 }
340 get_ext2_info(probe->dev, id, buf);
341 return 0;
342 }
343
344 static int probe_ext3(struct blkid_probe *probe, struct blkid_magic *id,
345 unsigned char *buf)
346 {
347 struct ext2_super_block *es;
348 es = (struct ext2_super_block *)buf;
349
350 /* Distinguish from ext4dev */
351 if (blkid_le32(es->s_flags) & EXT2_FLAGS_TEST_FILESYS)
352 return -BLKID_ERR_PARAM;
353
354 /* ext3 requires journal */
355 if (!(blkid_le32(es->s_feature_compat) &
356 EXT3_FEATURE_COMPAT_HAS_JOURNAL))
357 return -BLKID_ERR_PARAM;
358
359 /* Any features which ext3 doesn't understand */
360 if ((blkid_le32(es->s_feature_ro_compat) &
361 EXT3_FEATURE_RO_COMPAT_UNSUPPORTED) ||
362 (blkid_le32(es->s_feature_incompat) &
363 EXT3_FEATURE_INCOMPAT_UNSUPPORTED))
364 return -BLKID_ERR_PARAM;
365
366 get_ext2_info(probe->dev, id, buf);
367 return 0;
368 }
369
370 static int probe_ext2(struct blkid_probe *probe, struct blkid_magic *id,
371 unsigned char *buf)
372 {
373 struct ext2_super_block *es;
374
375 es = (struct ext2_super_block *)buf;
376
377 /* Distinguish between ext3 and ext2 */
378 if ((blkid_le32(es->s_feature_compat) &
379 EXT3_FEATURE_COMPAT_HAS_JOURNAL))
380 return -BLKID_ERR_PARAM;
381
382 /* Any features which ext2 doesn't understand */
383 if ((blkid_le32(es->s_feature_ro_compat) &
384 EXT2_FEATURE_RO_COMPAT_UNSUPPORTED) ||
385 (blkid_le32(es->s_feature_incompat) &
386 EXT2_FEATURE_INCOMPAT_UNSUPPORTED))
387 return -BLKID_ERR_PARAM;
388
389 get_ext2_info(probe->dev, id, buf);
390 return 0;
391 }
392
393 static int probe_jbd(struct blkid_probe *probe, struct blkid_magic *id,
394 unsigned char *buf)
395 {
396 struct ext2_super_block *es = (struct ext2_super_block *) buf;
397
398 if (!(blkid_le32(es->s_feature_incompat) &
399 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV))
400 return -BLKID_ERR_PARAM;
401
402 get_ext2_info(probe->dev, id, buf);
403
404 return 0;
405 }
406
407 #define FAT_ATTR_VOLUME_ID 0x08
408 #define FAT_ATTR_DIR 0x10
409 #define FAT_ATTR_LONG_NAME 0x0f
410 #define FAT_ATTR_MASK 0x3f
411 #define FAT_ENTRY_FREE 0xe5
412
413 static const char *no_name = "NO NAME ";
414
415 static unsigned char *search_fat_label(struct vfat_dir_entry *dir, int count)
416 {
417 int i;
418
419 for (i = 0; i < count; i++) {
420 if (dir[i].name[0] == 0x00)
421 break;
422
423 if ((dir[i].name[0] == FAT_ENTRY_FREE) ||
424 (dir[i].cluster_high != 0 || dir[i].cluster_low != 0) ||
425 ((dir[i].attr & FAT_ATTR_MASK) == FAT_ATTR_LONG_NAME))
426 continue;
427
428 if ((dir[i].attr & (FAT_ATTR_VOLUME_ID | FAT_ATTR_DIR)) ==
429 FAT_ATTR_VOLUME_ID) {
430 return dir[i].name;
431 }
432 }
433 return 0;
434 }
435
436 /* FAT label extraction from the root directory taken from Kay
437 * Sievers's volume_id library */
438 static int probe_fat(struct blkid_probe *probe,
439 struct blkid_magic *id __BLKID_ATTR((unused)),
440 unsigned char *buf)
441 {
442 struct vfat_super_block *vs = (struct vfat_super_block *) buf;
443 struct msdos_super_block *ms = (struct msdos_super_block *) buf;
444 struct vfat_dir_entry *dir;
445 char serno[10];
446 const unsigned char *label = 0, *vol_label = 0, *tmp;
447 unsigned char *vol_serno;
448 int label_len = 0, maxloop = 100;
449 __u16 sector_size, dir_entries, reserved;
450 __u32 sect_count, fat_size, dir_size, cluster_count, fat_length;
451 __u32 buf_size, start_data_sect, next, root_start, root_dir_entries;
452
453 /* sector size check */
454 tmp = (unsigned char *)&ms->ms_sector_size;
455 sector_size = tmp[0] + (tmp[1] << 8);
456 if (sector_size != 0x200 && sector_size != 0x400 &&
457 sector_size != 0x800 && sector_size != 0x1000)
458 return 1;
459
460 tmp = (unsigned char *)&ms->ms_dir_entries;
461 dir_entries = tmp[0] + (tmp[1] << 8);
462 reserved = blkid_le16(ms->ms_reserved);
463 tmp = (unsigned char *)&ms->ms_sectors;
464 sect_count = tmp[0] + (tmp[1] << 8);
465 if (sect_count == 0)
466 sect_count = blkid_le32(ms->ms_total_sect);
467
468 fat_length = blkid_le16(ms->ms_fat_length);
469 if (fat_length == 0)
470 fat_length = blkid_le32(vs->vs_fat32_length);
471
472 fat_size = fat_length * ms->ms_fats;
473 dir_size = ((dir_entries * sizeof(struct vfat_dir_entry)) +
474 (sector_size-1)) / sector_size;
475
476 cluster_count = sect_count - (reserved + fat_size + dir_size);
477 if (ms->ms_cluster_size == 0)
478 return 1;
479 cluster_count /= ms->ms_cluster_size;
480
481 if (cluster_count > FAT32_MAX)
482 return 1;
483
484 if (ms->ms_fat_length) {
485 /* the label may be an attribute in the root directory */
486 root_start = (reserved + fat_size) * sector_size;
487 root_dir_entries = vs->vs_dir_entries[0] +
488 (vs->vs_dir_entries[1] << 8);
489
490 buf_size = root_dir_entries * sizeof(struct vfat_dir_entry);
491 dir = (struct vfat_dir_entry *) get_buffer(probe, root_start,
492 buf_size);
493 if (dir)
494 vol_label = search_fat_label(dir, root_dir_entries);
495
496 if (!vol_label || !memcmp(vol_label, no_name, 11))
497 vol_label = ms->ms_label;
498 vol_serno = ms->ms_serno;
499
500 blkid_set_tag(probe->dev, "SEC_TYPE", "msdos",
501 sizeof("msdos"));
502 } else {
503 /* Search the FAT32 root dir for the label attribute */
504 buf_size = vs->vs_cluster_size * sector_size;
505 start_data_sect = reserved + fat_size;
506
507 next = blkid_le32(vs->vs_root_cluster);
508 while (next && --maxloop) {
509 __u32 next_sect_off;
510 __u64 next_off, fat_entry_off;
511 int count;
512
513 next_sect_off = (next - 2) * vs->vs_cluster_size;
514 next_off = (start_data_sect + next_sect_off) *
515 sector_size;
516
517 dir = (struct vfat_dir_entry *)
518 get_buffer(probe, next_off, buf_size);
519 if (dir == NULL)
520 break;
521
522 count = buf_size / sizeof(struct vfat_dir_entry);
523
524 vol_label = search_fat_label(dir, count);
525 if (vol_label)
526 break;
527
528 /* get FAT entry */
529 fat_entry_off = (reserved * sector_size) +
530 (next * sizeof(__u32));
531 buf = get_buffer(probe, fat_entry_off, buf_size);
532 if (buf == NULL)
533 break;
534
535 /* set next cluster */
536 next = blkid_le32(*((__u32 *) buf) & 0x0fffffff);
537 }
538
539 if (!vol_label || !memcmp(vol_label, no_name, 11))
540 vol_label = vs->vs_label;
541 vol_serno = vs->vs_serno;
542 }
543
544 if (vol_label && memcmp(vol_label, no_name, 11)) {
545 if ((label_len = figure_label_len(vol_label, 11)))
546 label = vol_label;
547 }
548
549 /* We can't just print them as %04X, because they are unaligned */
550 sprintf(serno, "%02X%02X-%02X%02X", vol_serno[3], vol_serno[2],
551 vol_serno[1], vol_serno[0]);
552
553 blkid_set_tag(probe->dev, "LABEL", (const char *) label, label_len);
554 blkid_set_tag(probe->dev, "UUID", serno, sizeof(serno)-1);
555
556 return 0;
557 }
558
559 /*
560 * The FAT filesystem could be without a magic string in superblock
561 * (e.g. old floppies). This heuristic for FAT detection is inspired
562 * by http://vrfy.org/projects/volume_id/ and Linux kernel.
563 * [7-Jul-2005, Karel Zak <kzak@redhat.com>]
564 */
565 static int probe_fat_nomagic(struct blkid_probe *probe,
566 struct blkid_magic *id __BLKID_ATTR((unused)),
567 unsigned char *buf)
568 {
569 struct vfat_super_block *vs;
570
571 vs = (struct vfat_super_block *)buf;
572
573 /* heads check */
574 if (vs->vs_heads == 0)
575 return 1;
576
577 /* cluster size check*/
578 if (vs->vs_cluster_size == 0 ||
579 (vs->vs_cluster_size & (vs->vs_cluster_size-1)))
580 return 1;
581
582 /* media check */
583 if (vs->vs_media < 0xf8 && vs->vs_media != 0xf0)
584 return 1;
585
586 /* fat counts(Linux kernel expects at least 1 FAT table) */
587 if (!vs->vs_fats)
588 return 1;
589
590 return probe_fat(probe, id, buf);
591 }
592
593 static int probe_ntfs(struct blkid_probe *probe,
594 struct blkid_magic *id __BLKID_ATTR((unused)),
595 unsigned char *buf)
596 {
597 struct ntfs_super_block *ns;
598 struct master_file_table_record *mft;
599 struct file_attribute *attr;
600 char uuid_str[17], label_str[129], *cp;
601 int bytes_per_sector, sectors_per_cluster;
602 int mft_record_size, attr_off, attr_len;
603 unsigned int i, attr_type, val_len;
604 int val_off;
605 __u64 nr_clusters;
606 blkid_loff_t off;
607 unsigned char *buf_mft, *val;
608
609 ns = (struct ntfs_super_block *) buf;
610
611 bytes_per_sector = ns->bios_parameter_block[0] +
612 (ns->bios_parameter_block[1] << 8);
613 sectors_per_cluster = ns->bios_parameter_block[2];
614
615 if ((bytes_per_sector < 512) || (sectors_per_cluster == 0))
616 return 1;
617
618 if (ns->cluster_per_mft_record < 0)
619 mft_record_size = 1 << (0-ns->cluster_per_mft_record);
620 else
621 mft_record_size = ns->cluster_per_mft_record *
622 sectors_per_cluster * bytes_per_sector;
623 nr_clusters = blkid_le64(ns->number_of_sectors) / sectors_per_cluster;
624
625 if ((blkid_le64(ns->mft_cluster_location) > nr_clusters) ||
626 (blkid_le64(ns->mft_mirror_cluster_location) > nr_clusters))
627 return 1;
628
629 off = blkid_le64(ns->mft_mirror_cluster_location) *
630 bytes_per_sector * sectors_per_cluster;
631
632 buf_mft = get_buffer(probe, off, mft_record_size);
633 if (!buf_mft)
634 return 1;
635
636 if (memcmp(buf_mft, "FILE", 4))
637 return 1;
638
639 off = blkid_le64(ns->mft_cluster_location) * bytes_per_sector *
640 sectors_per_cluster;
641
642 buf_mft = get_buffer(probe, off, mft_record_size);
643 if (!buf_mft)
644 return 1;
645
646 if (memcmp(buf_mft, "FILE", 4))
647 return 1;
648
649 off += MFT_RECORD_VOLUME * mft_record_size;
650
651 buf_mft = get_buffer(probe, off, mft_record_size);
652 if (!buf_mft)
653 return 1;
654
655 if (memcmp(buf_mft, "FILE", 4))
656 return 1;
657
658 mft = (struct master_file_table_record *) buf_mft;
659
660 attr_off = blkid_le16(mft->attrs_offset);
661 label_str[0] = 0;
662
663 while (1) {
664 attr = (struct file_attribute *) (buf_mft + attr_off);
665 attr_len = blkid_le16(attr->len);
666 attr_type = blkid_le32(attr->type);
667 val_off = blkid_le16(attr->value_offset);
668 val_len = blkid_le32(attr->value_len);
669
670 attr_off += attr_len;
671
672 if ((attr_off > mft_record_size) ||
673 (attr_len == 0))
674 break;
675
676 if (attr_type == MFT_RECORD_ATTR_END)
677 break;
678
679 if (attr_type == MFT_RECORD_ATTR_VOLUME_NAME) {
680 if (val_len > sizeof(label_str))
681 val_len = sizeof(label_str)-1;
682
683 for (i=0, cp=label_str; i < val_len; i+=2,cp++) {
684 val = ((__u8 *) attr) + val_off + i;
685 *cp = val[0];
686 if (val[1])
687 *cp = '?';
688 }
689 *cp = 0;
690 }
691 }
692
693 sprintf(uuid_str, "%016llX", blkid_le64(ns->volume_serial));
694 blkid_set_tag(probe->dev, "UUID", uuid_str, 0);
695 if (label_str[0])
696 blkid_set_tag(probe->dev, "LABEL", label_str, 0);
697 return 0;
698 }
699
700
701 static int probe_xfs(struct blkid_probe *probe,
702 struct blkid_magic *id __BLKID_ATTR((unused)),
703 unsigned char *buf)
704 {
705 struct xfs_super_block *xs;
706 const char *label = 0;
707
708 xs = (struct xfs_super_block *)buf;
709
710 if (strlen(xs->xs_fname))
711 label = xs->xs_fname;
712 blkid_set_tag(probe->dev, "LABEL", label, sizeof(xs->xs_fname));
713 set_uuid(probe->dev, xs->xs_uuid, 0);
714 return 0;
715 }
716
717 static int probe_reiserfs(struct blkid_probe *probe,
718 struct blkid_magic *id, unsigned char *buf)
719 {
720 struct reiserfs_super_block *rs = (struct reiserfs_super_block *) buf;
721 unsigned int blocksize;
722 const char *label = 0;
723
724 blocksize = blkid_le16(rs->rs_blocksize);
725
726 /* The blocksize must be at least 1k */
727 if ((blocksize >> 10) == 0)
728 return -BLKID_ERR_PARAM;
729
730 /* If the superblock is inside the journal, we have the wrong one */
731 if (id->bim_kboff/(blocksize>>10) > blkid_le32(rs->rs_journal_block))
732 return -BLKID_ERR_BIG;
733
734 /* LABEL/UUID are only valid for later versions of Reiserfs v3.6. */
735 if (id->bim_magic[6] == '2' || id->bim_magic[6] == '3') {
736 if (strlen(rs->rs_label))
737 label = rs->rs_label;
738 set_uuid(probe->dev, rs->rs_uuid, 0);
739 }
740 blkid_set_tag(probe->dev, "LABEL", label, sizeof(rs->rs_label));
741
742 return 0;
743 }
744
745 static int probe_reiserfs4(struct blkid_probe *probe,
746 struct blkid_magic *id __BLKID_ATTR((unused)),
747 unsigned char *buf)
748 {
749 struct reiser4_super_block *rs4 = (struct reiser4_super_block *) buf;
750 const unsigned char *label = 0;
751
752 if (strlen((char *) rs4->rs4_label))
753 label = rs4->rs4_label;
754 set_uuid(probe->dev, rs4->rs4_uuid, 0);
755 blkid_set_tag(probe->dev, "LABEL", (const char *) label,
756 sizeof(rs4->rs4_label));
757
758 return 0;
759 }
760
761 static int probe_jfs(struct blkid_probe *probe,
762 struct blkid_magic *id __BLKID_ATTR((unused)),
763 unsigned char *buf)
764 {
765 struct jfs_super_block *js;
766 const char *label = 0;
767
768 js = (struct jfs_super_block *)buf;
769
770 if (strlen((char *) js->js_label))
771 label = (char *) js->js_label;
772 blkid_set_tag(probe->dev, "LABEL", label, sizeof(js->js_label));
773 set_uuid(probe->dev, js->js_uuid, 0);
774 return 0;
775 }
776
777 static int probe_luks(struct blkid_probe *probe,
778 struct blkid_magic *id __BLKID_ATTR((unused)),
779 unsigned char *buf)
780 {
781 char uuid[40];
782 /* 168 is the offset to the 40 character uuid:
783 * http://luks.endorphin.org/LUKS-on-disk-format.pdf */
784 strncpy(uuid, (char *) buf+168, 40);
785 blkid_set_tag(probe->dev, "UUID", uuid, sizeof(uuid));
786 return 0;
787 }
788
789 static int probe_romfs(struct blkid_probe *probe,
790 struct blkid_magic *id __BLKID_ATTR((unused)),
791 unsigned char *buf)
792 {
793 struct romfs_super_block *ros;
794 const char *label = 0;
795
796 ros = (struct romfs_super_block *)buf;
797
798 if (strlen((char *) ros->ros_volume))
799 label = (char *) ros->ros_volume;
800 blkid_set_tag(probe->dev, "LABEL", label, 0);
801 return 0;
802 }
803
804 static int probe_cramfs(struct blkid_probe *probe,
805 struct blkid_magic *id __BLKID_ATTR((unused)),
806 unsigned char *buf)
807 {
808 struct cramfs_super_block *csb;
809 const char *label = 0;
810
811 csb = (struct cramfs_super_block *)buf;
812
813 if (strlen((char *) csb->name))
814 label = (char *) csb->name;
815 blkid_set_tag(probe->dev, "LABEL", label, 0);
816 return 0;
817 }
818
819 static int probe_swap0(struct blkid_probe *probe,
820 struct blkid_magic *id __BLKID_ATTR((unused)),
821 unsigned char *buf __BLKID_ATTR((unused)))
822 {
823 blkid_set_tag(probe->dev, "UUID", 0, 0);
824 blkid_set_tag(probe->dev, "LABEL", 0, 0);
825 return 0;
826 }
827
828 static int probe_swap1(struct blkid_probe *probe,
829 struct blkid_magic *id __BLKID_ATTR((unused)),
830 unsigned char *buf __BLKID_ATTR((unused)))
831 {
832 struct swap_id_block *sws;
833
834 probe_swap0(probe, id, buf);
835 /*
836 * Version 1 swap headers are always located at offset of 1024
837 * bytes, although the swap signature itself is located at the
838 * end of the page (which may vary depending on hardware
839 * pagesize).
840 */
841 sws = (struct swap_id_block *) get_buffer(probe, 1024, 1024);
842 if (!sws)
843 return 1;
844
845 /* arbitrary sanity check.. is there any garbage down there? */
846 if (sws->sws_pad[32] == 0 && sws->sws_pad[33] == 0) {
847 if (sws->sws_volume[0])
848 blkid_set_tag(probe->dev, "LABEL", sws->sws_volume,
849 sizeof(sws->sws_volume));
850 if (sws->sws_uuid[0])
851 set_uuid(probe->dev, sws->sws_uuid, 0);
852 }
853 return 0;
854 }
855
856 static int probe_iso9660(struct blkid_probe *probe,
857 struct blkid_magic *id __BLKID_ATTR((unused)),
858 unsigned char *buf)
859 {
860 struct iso_volume_descriptor *iso;
861 const unsigned char *label;
862
863 iso = (struct iso_volume_descriptor *) buf;
864 label = iso->volume_id;
865
866 blkid_set_tag(probe->dev, "LABEL", (const char *) label,
867 figure_label_len(label, 32));
868 return 0;
869 }
870
871
872 static const char
873 *udf_magic[] = { "BEA01", "BOOT2", "CD001", "CDW02", "NSR02",
874 "NSR03", "TEA01", 0 };
875
876 static int probe_udf(struct blkid_probe *probe,
877 struct blkid_magic *id __BLKID_ATTR((unused)),
878 unsigned char *buf __BLKID_ATTR((unused)))
879 {
880 int j, bs;
881 struct iso_volume_descriptor *isosb;
882 const char ** m;
883
884 /* determine the block size by scanning in 2K increments
885 (block sizes larger than 2K will be null padded) */
886 for (bs = 1; bs < 16; bs++) {
887 isosb = (struct iso_volume_descriptor *)
888 get_buffer(probe, bs*2048+32768, sizeof(isosb));
889 if (!isosb)
890 return 1;
891 if (isosb->vd_id[0])
892 break;
893 }
894
895 /* Scan up to another 64 blocks looking for additional VSD's */
896 for (j = 1; j < 64; j++) {
897 if (j > 1) {
898 isosb = (struct iso_volume_descriptor *)
899 get_buffer(probe, j*bs*2048+32768,
900 sizeof(isosb));
901 if (!isosb)
902 return 1;
903 }
904 /* If we find NSR0x then call it udf:
905 NSR01 for UDF 1.00
906 NSR02 for UDF 1.50
907 NSR03 for UDF 2.00 */
908 if (!memcmp(isosb->vd_id, "NSR0", 4))
909 return probe_iso9660(probe, id, buf);
910 for (m = udf_magic; *m; m++)
911 if (!memcmp(*m, isosb->vd_id, 5))
912 break;
913 if (*m == 0)
914 return 1;
915 }
916 return 1;
917 }
918
919 static int probe_ocfs(struct blkid_probe *probe,
920 struct blkid_magic *id __BLKID_ATTR((unused)),
921 unsigned char *buf)
922 {
923 struct ocfs_volume_header ovh;
924 struct ocfs_volume_label ovl;
925 __u32 major;
926
927 memcpy(&ovh, buf, sizeof(ovh));
928 memcpy(&ovl, buf+512, sizeof(ovl));
929
930 major = ocfsmajor(ovh);
931 if (major == 1)
932 blkid_set_tag(probe->dev,"SEC_TYPE","ocfs1",sizeof("ocfs1"));
933 else if (major >= 9)
934 blkid_set_tag(probe->dev,"SEC_TYPE","ntocfs",sizeof("ntocfs"));
935
936 blkid_set_tag(probe->dev, "LABEL", ovl.label, ocfslabellen(ovl));
937 blkid_set_tag(probe->dev, "MOUNT", ovh.mount, ocfsmountlen(ovh));
938 set_uuid(probe->dev, ovl.vol_id, 0);
939 return 0;
940 }
941
942 static int probe_ocfs2(struct blkid_probe *probe,
943 struct blkid_magic *id __BLKID_ATTR((unused)),
944 unsigned char *buf)
945 {
946 struct ocfs2_super_block *osb;
947
948 osb = (struct ocfs2_super_block *)buf;
949
950 blkid_set_tag(probe->dev, "LABEL", osb->s_label, sizeof(osb->s_label));
951 set_uuid(probe->dev, osb->s_uuid, 0);
952 return 0;
953 }
954
955 static int probe_oracleasm(struct blkid_probe *probe,
956 struct blkid_magic *id __BLKID_ATTR((unused)),
957 unsigned char *buf)
958 {
959 struct oracle_asm_disk_label *dl;
960
961 dl = (struct oracle_asm_disk_label *)buf;
962
963 blkid_set_tag(probe->dev, "LABEL", dl->dl_id, sizeof(dl->dl_id));
964 return 0;
965 }
966
967 static int probe_gfs(struct blkid_probe *probe,
968 struct blkid_magic *id __BLKID_ATTR((unused)),
969 unsigned char *buf)
970 {
971 struct gfs2_sb *sbd;
972 const char *label = 0;
973
974 sbd = (struct gfs2_sb *)buf;
975
976 if (blkid_be32(sbd->sb_fs_format) == GFS_FORMAT_FS &&
977 blkid_be32(sbd->sb_multihost_format) == GFS_FORMAT_MULTI)
978 {
979 blkid_set_tag(probe->dev, "UUID", 0, 0);
980
981 if (strlen(sbd->sb_locktable))
982 label = sbd->sb_locktable;
983 blkid_set_tag(probe->dev, "LABEL", label, sizeof(sbd->sb_locktable));
984 return 0;
985 }
986 return 1;
987 }
988
989 static int probe_gfs2(struct blkid_probe *probe,
990 struct blkid_magic *id __BLKID_ATTR((unused)),
991 unsigned char *buf)
992 {
993 struct gfs2_sb *sbd;
994 const char *label = 0;
995
996 sbd = (struct gfs2_sb *)buf;
997
998 if (blkid_be32(sbd->sb_fs_format) == GFS2_FORMAT_FS &&
999 blkid_be32(sbd->sb_multihost_format) == GFS2_FORMAT_MULTI)
1000 {
1001 blkid_set_tag(probe->dev, "UUID", 0, 0);
1002
1003 if (strlen(sbd->sb_locktable))
1004 label = sbd->sb_locktable;
1005 blkid_set_tag(probe->dev, "LABEL", label, sizeof(sbd->sb_locktable));
1006 return 0;
1007 }
1008 return 1;
1009 }
1010
1011 static int probe_hfsplus(struct blkid_probe *probe __BLKID_ATTR((unused)),
1012 struct blkid_magic *id __BLKID_ATTR((unused)),
1013 unsigned char *buf)
1014 {
1015 struct hfs_mdb *sbd = (struct hfs_mdb *)buf;
1016
1017 /* Check for a HFS+ volume embedded in a HFS volume */
1018 if (memcmp(sbd->embed_sig, "H+", 2) == 0)
1019 return 0;
1020
1021 return 1;
1022 }
1023
1024 #define LVM2_LABEL_SIZE 512
1025 static unsigned int lvm2_calc_crc(const void *buf, uint size)
1026 {
1027 static const uint crctab[] = {
1028 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
1029 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
1030 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
1031 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
1032 };
1033 uint i, crc = 0xf597a6cf;
1034 const __u8 *data = (const __u8 *) buf;
1035
1036 for (i = 0; i < size; i++) {
1037 crc ^= *data++;
1038 crc = (crc >> 4) ^ crctab[crc & 0xf];
1039 crc = (crc >> 4) ^ crctab[crc & 0xf];
1040 }
1041 return crc;
1042 }
1043
1044 static int probe_lvm2(struct blkid_probe *probe,
1045 struct blkid_magic *id __BLKID_ATTR((unused)),
1046 unsigned char *buf)
1047 {
1048 int sector = (id->bim_kboff) << 1;;
1049 struct lvm2_pv_label_header *label;
1050 label = (struct lvm2_pv_label_header *)buf;
1051 char *p, *q, uuid[40];
1052 unsigned int i, b;
1053
1054 /* buf is at 0k or 1k offset; find label inside */
1055 if (memcmp(buf, "LABELONE", 8) == 0) {
1056 label = (struct lvm2_pv_label_header *)buf;
1057 } else if (memcmp(buf + 512, "LABELONE", 8) == 0) {
1058 label = (struct lvm2_pv_label_header *)(buf + 512);
1059 sector++;
1060 } else {
1061 return 1;
1062 }
1063
1064 if (blkid_le64(label->sector_xl) != (unsigned) sector) {
1065 DBG(DEBUG_PROBE,
1066 printf("LVM2: label for sector %llu found at sector %d\n",
1067 blkid_le64(label->sector_xl), sector));
1068 return 1;
1069 }
1070
1071 if (lvm2_calc_crc(&label->offset_xl, LVM2_LABEL_SIZE -
1072 ((char *)&label->offset_xl - (char *)label)) !=
1073 blkid_le32(label->crc_xl)) {
1074 DBG(DEBUG_PROBE,
1075 printf("LVM2: label checksum incorrect at sector %d\n",
1076 sector));
1077 return 1;
1078 }
1079
1080 for (i=0, b=1, p=uuid, q= (char *) label->pv_uuid; i <= 32;
1081 i++, b <<= 1) {
1082 if (b & 0x4444440)
1083 *p++ = '-';
1084 *p++ = *q++;
1085 }
1086
1087 blkid_set_tag(probe->dev, "UUID", uuid, LVM2_ID_LEN+6);
1088
1089 return 0;
1090 }
1091 /*
1092 * BLKID_BLK_OFFS is at least as large as the highest bim_kboff defined
1093 * in the type_array table below + bim_kbalign.
1094 *
1095 * When probing for a lot of magics, we handle everything in 1kB buffers so
1096 * that we don't have to worry about reading each combination of block sizes.
1097 */
1098 #define BLKID_BLK_OFFS 64 /* currently reiserfs */
1099
1100 /*
1101 * Various filesystem magics that we can check for. Note that kboff and
1102 * sboff are in kilobytes and bytes respectively. All magics are in
1103 * byte strings so we don't worry about endian issues.
1104 */
1105 static struct blkid_magic type_array[] = {
1106 /* type kboff sboff len magic probe */
1107 { "oracleasm", 0, 32, 8, "ORCLDISK", probe_oracleasm },
1108 { "ntfs", 0, 3, 8, "NTFS ", probe_ntfs },
1109 { "jbd", 1, 0x38, 2, "\123\357", probe_jbd },
1110 { "ext4dev", 1, 0x38, 2, "\123\357", probe_ext4dev },
1111 { "ext4", 1, 0x38, 2, "\123\357", probe_ext4 },
1112 { "ext3", 1, 0x38, 2, "\123\357", probe_ext3 },
1113 { "ext2", 1, 0x38, 2, "\123\357", probe_ext2 },
1114 { "reiserfs", 8, 0x34, 8, "ReIsErFs", probe_reiserfs },
1115 { "reiserfs", 64, 0x34, 9, "ReIsEr2Fs", probe_reiserfs },
1116 { "reiserfs", 64, 0x34, 9, "ReIsEr3Fs", probe_reiserfs },
1117 { "reiserfs", 64, 0x34, 8, "ReIsErFs", probe_reiserfs },
1118 { "reiserfs", 8, 20, 8, "ReIsErFs", probe_reiserfs },
1119 { "reiser4", 64, 0, 7, "ReIsEr4", probe_reiserfs4 },
1120 { "gfs2", 64, 0, 4, "\x01\x16\x19\x70", probe_gfs2 },
1121 { "gfs", 64, 0, 4, "\x01\x16\x19\x70", probe_gfs },
1122 { "vfat", 0, 0x52, 5, "MSWIN", probe_fat },
1123 { "vfat", 0, 0x52, 8, "FAT32 ", probe_fat },
1124 { "vfat", 0, 0x36, 5, "MSDOS", probe_fat },
1125 { "vfat", 0, 0x36, 8, "FAT16 ", probe_fat },
1126 { "vfat", 0, 0x36, 8, "FAT12 ", probe_fat },
1127 { "vfat", 0, 0, 1, "\353", probe_fat_nomagic },
1128 { "vfat", 0, 0, 1, "\351", probe_fat_nomagic },
1129 { "vfat", 0, 0x1fe, 2, "\125\252", probe_fat_nomagic },
1130 { "minix", 1, 0x10, 2, "\177\023", 0 },
1131 { "minix", 1, 0x10, 2, "\217\023", 0 },
1132 { "minix", 1, 0x10, 2, "\150\044", 0 },
1133 { "minix", 1, 0x10, 2, "\170\044", 0 },
1134 { "vxfs", 1, 0, 4, "\365\374\001\245", 0 },
1135 { "xfs", 0, 0, 4, "XFSB", probe_xfs },
1136 { "romfs", 0, 0, 8, "-rom1fs-", probe_romfs },
1137 { "bfs", 0, 0, 4, "\316\372\173\033", 0 },
1138 { "cramfs", 0, 0, 4, "E=\315\050", probe_cramfs },
1139 { "qnx4", 0, 4, 6, "QNX4FS", 0 },
1140 { "udf", 32, 1, 5, "BEA01", probe_udf },
1141 { "udf", 32, 1, 5, "BOOT2", probe_udf },
1142 { "udf", 32, 1, 5, "CD001", probe_udf },
1143 { "udf", 32, 1, 5, "CDW02", probe_udf },
1144 { "udf", 32, 1, 5, "NSR02", probe_udf },
1145 { "udf", 32, 1, 5, "NSR03", probe_udf },
1146 { "udf", 32, 1, 5, "TEA01", probe_udf },
1147 { "iso9660", 32, 1, 5, "CD001", probe_iso9660 },
1148 { "iso9660", 32, 9, 5, "CDROM", probe_iso9660 },
1149 { "jfs", 32, 0, 4, "JFS1", probe_jfs },
1150 { "hfsplus", 1, 0, 2, "BD", probe_hfsplus },
1151 { "hfsplus", 1, 0, 2, "H+", 0 },
1152 { "hfs", 1, 0, 2, "BD", 0 },
1153 { "ufs", 8, 0x55c, 4, "T\031\001\000", 0 },
1154 { "hpfs", 8, 0, 4, "I\350\225\371", 0 },
1155 { "sysv", 0, 0x3f8, 4, "\020~\030\375", 0 },
1156 { "swap", 0, 0xff6, 10, "SWAP-SPACE", probe_swap0 },
1157 { "swap", 0, 0xff6, 10, "SWAPSPACE2", probe_swap1 },
1158 { "swsuspend", 0, 0xff6, 9, "S1SUSPEND", probe_swap1 },
1159 { "swsuspend", 0, 0xff6, 9, "S2SUSPEND", probe_swap1 },
1160 { "swap", 0, 0x1ff6, 10, "SWAP-SPACE", probe_swap0 },
1161 { "swap", 0, 0x1ff6, 10, "SWAPSPACE2", probe_swap1 },
1162 { "swsuspend", 0, 0x1ff6, 9, "S1SUSPEND", probe_swap1 },
1163 { "swsuspend", 0, 0x1ff6, 9, "S2SUSPEND", probe_swap1 },
1164 { "swap", 0, 0x3ff6, 10, "SWAP-SPACE", probe_swap0 },
1165 { "swap", 0, 0x3ff6, 10, "SWAPSPACE2", probe_swap1 },
1166 { "swsuspend", 0, 0x3ff6, 9, "S1SUSPEND", probe_swap1 },
1167 { "swsuspend", 0, 0x3ff6, 9, "S2SUSPEND", probe_swap1 },
1168 { "swap", 0, 0x7ff6, 10, "SWAP-SPACE", probe_swap0 },
1169 { "swap", 0, 0x7ff6, 10, "SWAPSPACE2", probe_swap1 },
1170 { "swsuspend", 0, 0x7ff6, 9, "S1SUSPEND", probe_swap1 },
1171 { "swsuspend", 0, 0x7ff6, 9, "S2SUSPEND", probe_swap1 },
1172 { "swap", 0, 0xfff6, 10, "SWAP-SPACE", probe_swap0 },
1173 { "swap", 0, 0xfff6, 10, "SWAPSPACE2", probe_swap1 },
1174 { "swsuspend", 0, 0xfff6, 9, "S1SUSPEND", probe_swap1 },
1175 { "swsuspend", 0, 0xfff6, 9, "S2SUSPEND", probe_swap1 },
1176 { "ocfs", 0, 8, 9, "OracleCFS", probe_ocfs },
1177 { "ocfs2", 1, 0, 6, "OCFSV2", probe_ocfs2 },
1178 { "ocfs2", 2, 0, 6, "OCFSV2", probe_ocfs2 },
1179 { "ocfs2", 4, 0, 6, "OCFSV2", probe_ocfs2 },
1180 { "ocfs2", 8, 0, 6, "OCFSV2", probe_ocfs2 },
1181 { "crypt_LUKS", 0, 0, 6, "LUKS\xba\xbe", probe_luks },
1182 { "squashfs", 0, 0, 4, "sqsh", 0 },
1183 { "squashfs", 0, 0, 4, "hsqs", 0 },
1184 { "lvm2pv", 0, 0x218, 8, "LVM2 001", probe_lvm2 },
1185 { "lvm2pv", 0, 0x018, 8, "LVM2 001", probe_lvm2 },
1186 { "lvm2pv", 1, 0x018, 8, "LVM2 001", probe_lvm2 },
1187 { "lvm2pv", 1, 0x218, 8, "LVM2 001", probe_lvm2 },
1188 { NULL, 0, 0, 0, NULL, NULL }
1189 };
1190
1191 /*
1192 * Verify that the data in dev is consistent with what is on the actual
1193 * block device (using the devname field only). Normally this will be
1194 * called when finding items in the cache, but for long running processes
1195 * is also desirable to revalidate an item before use.
1196 *
1197 * If we are unable to revalidate the data, we return the old data and
1198 * do not set the BLKID_BID_FL_VERIFIED flag on it.
1199 */
1200 blkid_dev blkid_verify(blkid_cache cache, blkid_dev dev)
1201 {
1202 struct blkid_magic *id;
1203 struct blkid_probe probe;
1204 blkid_tag_iterate iter;
1205 unsigned char *buf;
1206 const char *type, *value;
1207 struct stat st;
1208 time_t diff, now;
1209 int idx;
1210
1211 if (!dev)
1212 return NULL;
1213
1214 now = time(0);
1215 diff = now - dev->bid_time;
1216
1217 if ((now > dev->bid_time) && (diff > 0) &&
1218 ((diff < BLKID_PROBE_MIN) ||
1219 (dev->bid_flags & BLKID_BID_FL_VERIFIED &&
1220 diff < BLKID_PROBE_INTERVAL)))
1221 return dev;
1222
1223 DBG(DEBUG_PROBE,
1224 printf("need to revalidate %s (time since last check %llu)\n",
1225 dev->bid_name, (unsigned long long)diff));
1226
1227 if (((probe.fd = open(dev->bid_name, O_RDONLY)) < 0) ||
1228 (fstat(probe.fd, &st) < 0)) {
1229 if (probe.fd >= 0) close(probe.fd);
1230 if (errno != EPERM) {
1231 blkid_free_dev(dev);
1232 return NULL;
1233 }
1234 /* We don't have read permission, just return cache data. */
1235 DBG(DEBUG_PROBE,
1236 printf("returning unverified data for %s\n",
1237 dev->bid_name));
1238 return dev;
1239 }
1240
1241 probe.cache = cache;
1242 probe.dev = dev;
1243 probe.sbbuf = 0;
1244 probe.buf = 0;
1245 probe.buf_max = 0;
1246
1247 /*
1248 * Iterate over the type array. If we already know the type,
1249 * then try that first. If it doesn't work, then blow away
1250 * the type information, and try again.
1251 *
1252 */
1253 try_again:
1254 type = 0;
1255 if (!dev->bid_type || !strcmp(dev->bid_type, "mdraid")) {
1256 uuid_t uuid;
1257
1258 if (check_mdraid(probe.fd, uuid) == 0) {
1259 set_uuid(dev, uuid, 0);
1260 type = "mdraid";
1261 goto found_type;
1262 }
1263 }
1264 for (id = type_array; id->bim_type; id++) {
1265 if (dev->bid_type &&
1266 strcmp(id->bim_type, dev->bid_type))
1267 continue;
1268
1269 idx = id->bim_kboff + (id->bim_sboff >> 10);
1270 buf = get_buffer(&probe, idx << 10, 1024);
1271 if (!buf)
1272 continue;
1273
1274 if (memcmp(id->bim_magic, buf + (id->bim_sboff&0x3ff),
1275 id->bim_len))
1276 continue;
1277
1278 if ((id->bim_probe == NULL) ||
1279 (id->bim_probe(&probe, id, buf) == 0)) {
1280 type = id->bim_type;
1281 goto found_type;
1282 }
1283 }
1284
1285 if (!id->bim_type && dev->bid_type) {
1286 /*
1287 * Zap the device filesystem information and try again
1288 */
1289 DBG(DEBUG_PROBE,
1290 printf("previous fs type %s not valid, "
1291 "trying full probe\n", dev->bid_type));
1292 iter = blkid_tag_iterate_begin(dev);
1293 while (blkid_tag_next(iter, &type, &value) == 0)
1294 blkid_set_tag(dev, type, 0, 0);
1295 blkid_tag_iterate_end(iter);
1296 goto try_again;
1297 }
1298
1299 if (!dev->bid_type) {
1300 blkid_free_dev(dev);
1301 dev = 0;
1302 goto found_type;
1303 }
1304
1305 found_type:
1306 if (dev && type) {
1307 dev->bid_devno = st.st_rdev;
1308 dev->bid_time = time(0);
1309 dev->bid_flags |= BLKID_BID_FL_VERIFIED;
1310 cache->bic_flags |= BLKID_BIC_FL_CHANGED;
1311
1312 blkid_set_tag(dev, "TYPE", type, 0);
1313
1314 DBG(DEBUG_PROBE, printf("%s: devno 0x%04llx, type %s\n",
1315 dev->bid_name, (long long)st.st_rdev, type));
1316 }
1317
1318 if (probe.sbbuf)
1319 free(probe.sbbuf);
1320 if (probe.buf)
1321 free(probe.buf);
1322 if (probe.fd >= 0)
1323 close(probe.fd);
1324
1325 return dev;
1326 }
1327
1328 int blkid_known_fstype(const char *fstype)
1329 {
1330 struct blkid_magic *id;
1331
1332 for (id = type_array; id->bim_type; id++) {
1333 if (strcmp(fstype, id->bim_type) == 0)
1334 return 1;
1335 }
1336 return 0;
1337 }
1338
1339 #ifdef TEST_PROGRAM
1340 int main(int argc, char **argv)
1341 {
1342 blkid_dev dev;
1343 blkid_cache cache;
1344 int ret;
1345
1346 if (argc != 2) {
1347 fprintf(stderr, "Usage: %s device\n"
1348 "Probe a single device to determine type\n", argv[0]);
1349 exit(1);
1350 }
1351 if ((ret = blkid_get_cache(&cache, "/dev/null")) != 0) {
1352 fprintf(stderr, "%s: error creating cache (%d)\n",
1353 argv[0], ret);
1354 exit(1);
1355 }
1356 dev = blkid_get_dev(cache, argv[1], BLKID_DEV_NORMAL);
1357 if (!dev) {
1358 printf("%s: %s has an unsupported type\n", argv[0], argv[1]);
1359 return (1);
1360 }
1361 printf("TYPE='%s'\n", dev->bid_type ? dev->bid_type : "(null)");
1362 if (dev->bid_label)
1363 printf("LABEL='%s'\n", dev->bid_label);
1364 if (dev->bid_uuid)
1365 printf("UUID='%s'\n", dev->bid_uuid);
1366
1367 blkid_free_dev(dev);
1368 return (0);
1369 }
1370 #endif
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