probe.c revision 9c460caae3dab7803c0e7d9399b47e790cf90661
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
37static 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
50static 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 */
94static 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
126static 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
136static 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 */
167static 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 */
204static 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
240static 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
253static 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
266static 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
303static 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
344static 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
370static 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
393static 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
413static const char *no_name = "NO NAME    ";
414
415static 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 */
438static 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 */
565static 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
593static 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
701static 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
717static 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
745static 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
761static 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
777static int probe_zfs(struct blkid_probe *probe, struct blkid_magic *id,
778		     unsigned char *buf)
779{
780#if 0
781	char *vdev_label;
782	const char *pool_name = 0;
783
784	/* read nvpair data for pool name, pool GUID (complex) */
785	blkid_set_tag(probe->dev, "LABEL", pool_name, sizeof(pool_name));
786	set_uuid(probe->dev, pool_guid, 0);
787#endif
788	return 0;
789}
790
791static int probe_luks(struct blkid_probe *probe,
792		       struct blkid_magic *id __BLKID_ATTR((unused)),
793		       unsigned char *buf)
794{
795	char uuid[40];
796
797	/* 168 is the offset to the 40 character uuid:
798	 * http://luks.endorphin.org/LUKS-on-disk-format.pdf */
799	strncpy(uuid, (char *) buf+168, 40);
800	blkid_set_tag(probe->dev, "UUID", uuid, sizeof(uuid));
801	return 0;
802}
803
804static int probe_romfs(struct blkid_probe *probe,
805		       struct blkid_magic *id __BLKID_ATTR((unused)),
806		       unsigned char *buf)
807{
808	struct romfs_super_block *ros;
809	const char *label = 0;
810
811	ros = (struct romfs_super_block *)buf;
812
813	if (strlen((char *) ros->ros_volume))
814		label = (char *) ros->ros_volume;
815	blkid_set_tag(probe->dev, "LABEL", label, 0);
816	return 0;
817}
818
819static int probe_cramfs(struct blkid_probe *probe,
820			struct blkid_magic *id __BLKID_ATTR((unused)),
821			unsigned char *buf)
822{
823	struct cramfs_super_block *csb;
824	const char *label = 0;
825
826	csb = (struct cramfs_super_block *)buf;
827
828	if (strlen((char *) csb->name))
829		label = (char *) csb->name;
830	blkid_set_tag(probe->dev, "LABEL", label, 0);
831	return 0;
832}
833
834static int probe_swap0(struct blkid_probe *probe,
835		       struct blkid_magic *id __BLKID_ATTR((unused)),
836		       unsigned char *buf __BLKID_ATTR((unused)))
837{
838	blkid_set_tag(probe->dev, "UUID", 0, 0);
839	blkid_set_tag(probe->dev, "LABEL", 0, 0);
840	return 0;
841}
842
843static int probe_swap1(struct blkid_probe *probe,
844		       struct blkid_magic *id,
845		       unsigned char *buf __BLKID_ATTR((unused)))
846{
847	struct swap_id_block *sws;
848
849	probe_swap0(probe, id, buf);
850	/*
851	 * Version 1 swap headers are always located at offset of 1024
852	 * bytes, although the swap signature itself is located at the
853	 * end of the page (which may vary depending on hardware
854	 * pagesize).
855	 */
856	sws = (struct swap_id_block *) get_buffer(probe, 1024, 1024);
857	if (!sws)
858		return 1;
859
860	/* check for wrong version or zeroed pagecount, for sanity */
861	if (!memcmp(id->bim_magic, "SWAPSPACE2", id->bim_len) &&
862			(sws->sws_version != 1 || sws->sws_lastpage == 0))
863		return 1;
864
865	/* arbitrary sanity check.. is there any garbage down there? */
866	if (sws->sws_pad[32] == 0 && sws->sws_pad[33] == 0)  {
867		if (sws->sws_volume[0])
868			blkid_set_tag(probe->dev, "LABEL", sws->sws_volume,
869				      sizeof(sws->sws_volume));
870		if (sws->sws_uuid[0])
871			set_uuid(probe->dev, sws->sws_uuid, 0);
872	}
873	return 0;
874}
875
876static int probe_iso9660(struct blkid_probe *probe,
877			 struct blkid_magic *id __BLKID_ATTR((unused)),
878			 unsigned char *buf)
879{
880	struct iso_volume_descriptor *iso;
881	const unsigned char *label;
882
883	iso = (struct iso_volume_descriptor *) buf;
884	label = iso->volume_id;
885
886	blkid_set_tag(probe->dev, "LABEL", (const char *) label,
887		      figure_label_len(label, 32));
888	return 0;
889}
890
891
892static const char
893*udf_magic[] = { "BEA01", "BOOT2", "CD001", "CDW02", "NSR02",
894		 "NSR03", "TEA01", 0 };
895
896static int probe_udf(struct blkid_probe *probe,
897		     struct blkid_magic *id __BLKID_ATTR((unused)),
898		     unsigned char *buf __BLKID_ATTR((unused)))
899{
900	int j, bs;
901	struct iso_volume_descriptor *isosb;
902	const char ** m;
903
904	/* determine the block size by scanning in 2K increments
905	   (block sizes larger than 2K will be null padded) */
906	for (bs = 1; bs < 16; bs++) {
907		isosb = (struct iso_volume_descriptor *)
908			get_buffer(probe, bs*2048+32768, sizeof(isosb));
909		if (!isosb)
910			return 1;
911		if (isosb->vd_id[0])
912			break;
913	}
914
915	/* Scan up to another 64 blocks looking for additional VSD's */
916	for (j = 1; j < 64; j++) {
917		if (j > 1) {
918			isosb = (struct iso_volume_descriptor *)
919				get_buffer(probe, j*bs*2048+32768,
920					   sizeof(isosb));
921			if (!isosb)
922				return 1;
923		}
924		/* If we find NSR0x then call it udf:
925		   NSR01 for UDF 1.00
926		   NSR02 for UDF 1.50
927		   NSR03 for UDF 2.00 */
928		if (!memcmp(isosb->vd_id, "NSR0", 4))
929			return probe_iso9660(probe, id, buf);
930		for (m = udf_magic; *m; m++)
931			if (!memcmp(*m, isosb->vd_id, 5))
932				break;
933		if (*m == 0)
934			return 1;
935	}
936	return 1;
937}
938
939static int probe_ocfs(struct blkid_probe *probe,
940		      struct blkid_magic *id __BLKID_ATTR((unused)),
941		      unsigned char *buf)
942{
943	struct ocfs_volume_header ovh;
944	struct ocfs_volume_label ovl;
945	__u32 major;
946
947	memcpy(&ovh, buf, sizeof(ovh));
948	memcpy(&ovl, buf+512, sizeof(ovl));
949
950	major = ocfsmajor(ovh);
951	if (major == 1)
952		blkid_set_tag(probe->dev,"SEC_TYPE","ocfs1",sizeof("ocfs1"));
953	else if (major >= 9)
954		blkid_set_tag(probe->dev,"SEC_TYPE","ntocfs",sizeof("ntocfs"));
955
956	blkid_set_tag(probe->dev, "LABEL", ovl.label, ocfslabellen(ovl));
957	blkid_set_tag(probe->dev, "MOUNT", ovh.mount, ocfsmountlen(ovh));
958	set_uuid(probe->dev, ovl.vol_id, 0);
959	return 0;
960}
961
962static int probe_ocfs2(struct blkid_probe *probe,
963		       struct blkid_magic *id __BLKID_ATTR((unused)),
964		       unsigned char *buf)
965{
966	struct ocfs2_super_block *osb;
967
968	osb = (struct ocfs2_super_block *)buf;
969
970	blkid_set_tag(probe->dev, "LABEL", osb->s_label, sizeof(osb->s_label));
971	set_uuid(probe->dev, osb->s_uuid, 0);
972	return 0;
973}
974
975static int probe_oracleasm(struct blkid_probe *probe,
976			   struct blkid_magic *id __BLKID_ATTR((unused)),
977			   unsigned char *buf)
978{
979	struct oracle_asm_disk_label *dl;
980
981	dl = (struct oracle_asm_disk_label *)buf;
982
983	blkid_set_tag(probe->dev, "LABEL", dl->dl_id, sizeof(dl->dl_id));
984	return 0;
985}
986
987static int probe_gfs(struct blkid_probe *probe,
988		     struct blkid_magic *id __BLKID_ATTR((unused)),
989		     unsigned char *buf)
990{
991	struct gfs2_sb *sbd;
992	const char *label = 0;
993
994	sbd = (struct gfs2_sb *)buf;
995
996	if (blkid_be32(sbd->sb_fs_format) == GFS_FORMAT_FS &&
997	    blkid_be32(sbd->sb_multihost_format) == GFS_FORMAT_MULTI)
998	{
999		blkid_set_tag(probe->dev, "UUID", 0, 0);
1000
1001		if (strlen(sbd->sb_locktable))
1002			label = sbd->sb_locktable;
1003		blkid_set_tag(probe->dev, "LABEL", label, sizeof(sbd->sb_locktable));
1004		return 0;
1005	}
1006	return 1;
1007}
1008
1009static int probe_gfs2(struct blkid_probe *probe,
1010		     struct blkid_magic *id __BLKID_ATTR((unused)),
1011		     unsigned char *buf)
1012{
1013	struct gfs2_sb *sbd;
1014	const char *label = 0;
1015
1016	sbd = (struct gfs2_sb *)buf;
1017
1018	if (blkid_be32(sbd->sb_fs_format) == GFS2_FORMAT_FS &&
1019	    blkid_be32(sbd->sb_multihost_format) == GFS2_FORMAT_MULTI)
1020	{
1021		blkid_set_tag(probe->dev, "UUID", 0, 0);
1022
1023		if (strlen(sbd->sb_locktable))
1024			label = sbd->sb_locktable;
1025		blkid_set_tag(probe->dev, "LABEL", label, sizeof(sbd->sb_locktable));
1026		return 0;
1027	}
1028	return 1;
1029}
1030
1031void unicode_16be_to_utf8(unsigned char *str, int out_len,
1032			 const unsigned char *buf, int in_len)
1033{
1034	int i, j;
1035	unsigned int c;
1036
1037	for (i = j = 0; i + 2 <= in_len; i += 2) {
1038		c = (buf[i] << 8) | buf[i+1];
1039		if (c == 0) {
1040			str[j] = '\0';
1041			break;
1042		} else if (c < 0x80) {
1043			if (j+1 >= out_len)
1044				break;
1045			str[j++] = (unsigned char) c;
1046		} else if (c < 0x800) {
1047			if (j+2 >= out_len)
1048				break;
1049			str[j++] = (unsigned char) (0xc0 | (c >> 6));
1050			str[j++] = (unsigned char) (0x80 | (c & 0x3f));
1051		} else {
1052			if (j+3 >= out_len)
1053				break;
1054			str[j++] = (unsigned char) (0xe0 | (c >> 12));
1055			str[j++] = (unsigned char) (0x80 | ((c >> 6) & 0x3f));
1056			str[j++] = (unsigned char) (0x80 | (c & 0x3f));
1057		}
1058	}
1059	str[j] = '\0';
1060}
1061
1062static int probe_hfs(struct blkid_probe *probe __BLKID_ATTR((unused)),
1063			 struct blkid_magic *id __BLKID_ATTR((unused)),
1064			 unsigned char *buf)
1065{
1066	struct hfs_mdb *hfs = (struct hfs_mdb *) buf;
1067	char	uuid_str[17];
1068	__u64	uuid;
1069
1070	if ((memcmp(hfs->embed_sig, "H+", 2) == 0) ||
1071	    (memcmp(hfs->embed_sig, "HX", 2) == 0))
1072		return 1;	/* Not hfs, but an embedded HFS+ */
1073
1074	uuid = blkid_le64(*((unsigned long long *) hfs->finder_info.id));
1075	if (uuid) {
1076		sprintf(uuid_str, "%016llX", uuid);
1077		blkid_set_tag(probe->dev, "UUID", uuid_str, 0);
1078	}
1079	blkid_set_tag(probe->dev, "LABEL", hfs->label, hfs->label_len);
1080	return 0;
1081}
1082
1083
1084static int probe_hfsplus(struct blkid_probe *probe,
1085			 struct blkid_magic *id,
1086			 unsigned char *buf)
1087{
1088	struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT];
1089	struct hfsplus_bnode_descriptor *descr;
1090	struct hfsplus_bheader_record *bnode;
1091	struct hfsplus_catalog_key *key;
1092	struct hfsplus_vol_header *hfsplus;
1093	struct hfs_mdb *sbd = (struct hfs_mdb *) buf;
1094	unsigned int alloc_block_size;
1095	unsigned int alloc_first_block;
1096	unsigned int embed_first_block;
1097	unsigned int off = 0;
1098	unsigned int blocksize;
1099	unsigned int cat_block;
1100	unsigned int ext_block_start;
1101	unsigned int ext_block_count;
1102	unsigned int record_count;
1103	unsigned int leaf_node_head;
1104	unsigned int leaf_node_count;
1105	unsigned int leaf_node_size;
1106	unsigned int leaf_block;
1107	unsigned int label_len;
1108	int ext;
1109	__u64 leaf_off, uuid;
1110	char	uuid_str[17], label[512];
1111
1112	/* Check for a HFS+ volume embedded in a HFS volume */
1113	if (memcmp(sbd->signature, "BD", 2) == 0) {
1114		if ((memcmp(sbd->embed_sig, "H+", 2) != 0) &&
1115		    (memcmp(sbd->embed_sig, "HX", 2) != 0))
1116			/* This must be an HFS volume, so fail */
1117			return 1;
1118
1119		alloc_block_size = blkid_be32(sbd->al_blk_size);
1120		alloc_first_block = blkid_be16(sbd->al_bl_st);
1121		embed_first_block = blkid_be16(sbd->embed_startblock);
1122		off = (alloc_first_block * 512) +
1123			(embed_first_block * alloc_block_size);
1124		buf = get_buffer(probe, off + (id->bim_kboff * 1024),
1125				 sizeof(sbd));
1126		if (!buf)
1127			return 1;
1128
1129		hfsplus = (struct hfsplus_vol_header *) buf;
1130	}
1131
1132	hfsplus = (struct hfsplus_vol_header *) buf;
1133
1134	if ((memcmp(hfsplus->signature, "H+", 2) != 0) &&
1135	    (memcmp(hfsplus->signature, "HX", 2) != 0))
1136		return 1;
1137
1138	uuid = blkid_le64(*((unsigned long long *) hfsplus->finder_info.id));
1139	if (uuid) {
1140		sprintf(uuid_str, "%016llX", uuid);
1141		blkid_set_tag(probe->dev, "UUID", uuid_str, 0);
1142	}
1143
1144	blocksize = blkid_be32(hfsplus->blocksize);
1145	memcpy(extents, hfsplus->cat_file.extents, sizeof(extents));
1146	cat_block = blkid_be32(extents[0].start_block);
1147
1148	buf = get_buffer(probe, off + (cat_block * blocksize), 0x2000);
1149	if (!buf)
1150		return 0;
1151
1152	bnode = (struct hfsplus_bheader_record *)
1153		&buf[sizeof(struct hfsplus_bnode_descriptor)];
1154
1155	leaf_node_head = blkid_be32(bnode->leaf_head);
1156	leaf_node_size = blkid_be16(bnode->node_size);
1157	leaf_node_count = blkid_be32(bnode->leaf_count);
1158	if (leaf_node_count == 0)
1159		return 0;
1160
1161	leaf_block = (leaf_node_head * leaf_node_size) / blocksize;
1162
1163	/* get physical location */
1164	for (ext = 0; ext < HFSPLUS_EXTENT_COUNT; ext++) {
1165		ext_block_start = blkid_be32(extents[ext].start_block);
1166		ext_block_count = blkid_be32(extents[ext].block_count);
1167		if (ext_block_count == 0)
1168			return 0;
1169
1170		/* this is our extent */
1171		if (leaf_block < ext_block_count)
1172			break;
1173
1174		leaf_block -= ext_block_count;
1175	}
1176	if (ext == HFSPLUS_EXTENT_COUNT)
1177		return 0;
1178
1179	leaf_off = (ext_block_start + leaf_block) * blocksize;
1180
1181	buf = get_buffer(probe, off + leaf_off, leaf_node_size);
1182	if (!buf)
1183		return 0;
1184
1185	descr = (struct hfsplus_bnode_descriptor *) buf;
1186	record_count = blkid_be16(descr->num_recs);
1187	if (record_count == 0)
1188		return 0;
1189
1190	if (descr->type != HFS_NODE_LEAF)
1191		return 0;
1192
1193	key = (struct hfsplus_catalog_key *)
1194		&buf[sizeof(struct hfsplus_bnode_descriptor)];
1195
1196	if (blkid_be32(key->parent_id) != HFSPLUS_POR_CNID)
1197		return 0;
1198
1199	label_len = blkid_be16(key->unicode_len) * 2;
1200	unicode_16be_to_utf8(label, sizeof(label), key->unicode, label_len);
1201	blkid_set_tag(probe->dev, "LABEL", label, 0);
1202	return 0;
1203}
1204
1205#define LVM2_LABEL_SIZE 512
1206static unsigned int lvm2_calc_crc(const void *buf, unsigned int size)
1207{
1208	static const unsigned int crctab[] = {
1209		0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
1210		0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
1211		0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
1212		0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
1213	};
1214	unsigned int i, crc = 0xf597a6cf;
1215	const __u8 *data = (const __u8 *) buf;
1216
1217	for (i = 0; i < size; i++) {
1218		crc ^= *data++;
1219		crc = (crc >> 4) ^ crctab[crc & 0xf];
1220		crc = (crc >> 4) ^ crctab[crc & 0xf];
1221	}
1222	return crc;
1223}
1224
1225static int probe_lvm2(struct blkid_probe *probe,
1226			struct blkid_magic *id,
1227			unsigned char *buf)
1228{
1229	int sector = (id->bim_kboff) << 1;
1230	struct lvm2_pv_label_header *label= (struct lvm2_pv_label_header *)buf;
1231	char *p, *q, uuid[40];
1232	unsigned int i, b;
1233
1234	/* buf is at 0k or 1k offset; find label inside */
1235	if (memcmp(buf, "LABELONE", 8) == 0) {
1236		label = (struct lvm2_pv_label_header *)buf;
1237	} else if (memcmp(buf + 512, "LABELONE", 8) == 0) {
1238		label = (struct lvm2_pv_label_header *)(buf + 512);
1239		sector++;
1240	} else {
1241		return 1;
1242	}
1243
1244	if (blkid_le64(label->sector_xl) != (unsigned) sector) {
1245		DBG(DEBUG_PROBE,
1246		    printf("LVM2: label for sector %llu found at sector %d\n",
1247			   blkid_le64(label->sector_xl), sector));
1248		return 1;
1249	}
1250
1251	if (lvm2_calc_crc(&label->offset_xl, LVM2_LABEL_SIZE -
1252			  ((char *)&label->offset_xl - (char *)label)) !=
1253			blkid_le32(label->crc_xl)) {
1254		DBG(DEBUG_PROBE,
1255		    printf("LVM2: label checksum incorrect at sector %d\n",
1256			   sector));
1257		return 1;
1258	}
1259
1260	for (i=0, b=1, p=uuid, q= (char *) label->pv_uuid; i <= 32;
1261	     i++, b <<= 1) {
1262		if (b & 0x4444440)
1263			*p++ = '-';
1264		*p++ = *q++;
1265	}
1266
1267	blkid_set_tag(probe->dev, "UUID", uuid, LVM2_ID_LEN+6);
1268
1269	return 0;
1270}
1271/*
1272 * Various filesystem magics that we can check for.  Note that kboff and
1273 * sboff are in kilobytes and bytes respectively.  All magics are in
1274 * byte strings so we don't worry about endian issues.
1275 */
1276static struct blkid_magic type_array[] = {
1277/*  type     kboff   sboff len  magic			probe */
1278  { "oracleasm", 0,	32,  8, "ORCLDISK",		probe_oracleasm },
1279  { "ntfs",	 0,	 3,  8, "NTFS    ",		probe_ntfs },
1280  { "jbd",	 1,   0x38,  2, "\123\357",		probe_jbd },
1281  { "ext4dev",	 1,   0x38,  2, "\123\357",		probe_ext4dev },
1282  { "ext4",	 1,   0x38,  2, "\123\357",		probe_ext4 },
1283  { "ext3",	 1,   0x38,  2, "\123\357",		probe_ext3 },
1284  { "ext2",	 1,   0x38,  2, "\123\357",		probe_ext2 },
1285  { "reiserfs",	 8,   0x34,  8, "ReIsErFs",		probe_reiserfs },
1286  { "reiserfs", 64,   0x34,  9, "ReIsEr2Fs",		probe_reiserfs },
1287  { "reiserfs", 64,   0x34,  9, "ReIsEr3Fs",		probe_reiserfs },
1288  { "reiserfs", 64,   0x34,  8, "ReIsErFs",		probe_reiserfs },
1289  { "reiserfs",	 8,	20,  8, "ReIsErFs",		probe_reiserfs },
1290  { "reiser4",  64,	 0,  7, "ReIsEr4",		probe_reiserfs4 },
1291  { "gfs2",     64,      0,  4, "\x01\x16\x19\x70",     probe_gfs2 },
1292  { "gfs",      64,      0,  4, "\x01\x16\x19\x70",     probe_gfs },
1293  { "vfat",      0,   0x52,  5, "MSWIN",                probe_fat },
1294  { "vfat",      0,   0x52,  8, "FAT32   ",             probe_fat },
1295  { "vfat",      0,   0x36,  5, "MSDOS",                probe_fat },
1296  { "vfat",      0,   0x36,  8, "FAT16   ",             probe_fat },
1297  { "vfat",      0,   0x36,  8, "FAT12   ",             probe_fat },
1298  { "vfat",      0,      0,  1, "\353",                 probe_fat_nomagic },
1299  { "vfat",      0,      0,  1, "\351",                 probe_fat_nomagic },
1300  { "vfat",      0,  0x1fe,  2, "\125\252",             probe_fat_nomagic },
1301  { "minix",     1,   0x10,  2, "\177\023",             0 },
1302  { "minix",     1,   0x10,  2, "\217\023",             0 },
1303  { "minix",	 1,   0x10,  2, "\150\044",		0 },
1304  { "minix",	 1,   0x10,  2, "\170\044",		0 },
1305  { "vxfs",	 1,	 0,  4, "\365\374\001\245",	0 },
1306  { "xfs",	 0,	 0,  4, "XFSB",			probe_xfs },
1307  { "romfs",	 0,	 0,  8, "-rom1fs-",		probe_romfs },
1308  { "bfs",	 0,	 0,  4, "\316\372\173\033",	0 },
1309  { "cramfs",	 0,	 0,  4, "E=\315\050",		probe_cramfs },
1310  { "qnx4",	 0,	 4,  6, "QNX4FS",		0 },
1311  { "udf",	32,	 1,  5, "BEA01",		probe_udf },
1312  { "udf",	32,	 1,  5, "BOOT2",		probe_udf },
1313  { "udf",	32,	 1,  5, "CD001",		probe_udf },
1314  { "udf",	32,	 1,  5, "CDW02",		probe_udf },
1315  { "udf",	32,	 1,  5, "NSR02",		probe_udf },
1316  { "udf",	32,	 1,  5, "NSR03",		probe_udf },
1317  { "udf",	32,	 1,  5, "TEA01",		probe_udf },
1318  { "iso9660",	32,	 1,  5, "CD001",		probe_iso9660 },
1319  { "iso9660",	32,	 9,  5, "CDROM",		probe_iso9660 },
1320  { "jfs",	32,	 0,  4, "JFS1",			probe_jfs },
1321  { "zfs",       8,	 0,  8, "\0\0\x02\xf5\xb0\x07\xb1\x0c", probe_zfs },
1322  { "zfs",       8,	 0,  8, "\x0c\xb1\x07\xb0\xf5\x02\0\0", probe_zfs },
1323  { "zfs",     264,	 0,  8, "\0\0\x02\xf5\xb0\x07\xb1\x0c", probe_zfs },
1324  { "zfs",     264,	 0,  8, "\x0c\xb1\x07\xb0\xf5\x02\0\0", probe_zfs },
1325  { "hfsplus",	 1,	 0,  2, "BD",			probe_hfsplus },
1326  { "hfsplus",	 1,	 0,  2, "H+",			probe_hfsplus },
1327  { "hfsplus",	 1,	 0,  2, "HX",			probe_hfsplus },
1328  { "hfs",	 1,	 0,  2, "BD",			probe_hfs },
1329  { "ufs",	 8,  0x55c,  4, "T\031\001\000",	0 },
1330  { "hpfs",	 8,	 0,  4, "I\350\225\371",	0 },
1331  { "sysv",	 0,  0x3f8,  4, "\020~\030\375",	0 },
1332  { "swap",	 0,  0xff6, 10, "SWAP-SPACE",		probe_swap0 },
1333  { "swap",	 0,  0xff6, 10, "SWAPSPACE2",		probe_swap1 },
1334  { "swsuspend", 0,  0xff6,  9, "S1SUSPEND",		probe_swap1 },
1335  { "swsuspend", 0,  0xff6,  9, "S2SUSPEND",		probe_swap1 },
1336  { "swap",	 0, 0x1ff6, 10, "SWAP-SPACE",		probe_swap0 },
1337  { "swap",	 0, 0x1ff6, 10, "SWAPSPACE2",		probe_swap1 },
1338  { "swsuspend", 0, 0x1ff6,  9, "S1SUSPEND",		probe_swap1 },
1339  { "swsuspend", 0, 0x1ff6,  9, "S2SUSPEND",		probe_swap1 },
1340  { "swap",	 0, 0x3ff6, 10, "SWAP-SPACE",		probe_swap0 },
1341  { "swap",	 0, 0x3ff6, 10, "SWAPSPACE2",		probe_swap1 },
1342  { "swsuspend", 0, 0x3ff6,  9, "S1SUSPEND",		probe_swap1 },
1343  { "swsuspend", 0, 0x3ff6,  9, "S2SUSPEND",		probe_swap1 },
1344  { "swap",	 0, 0x7ff6, 10, "SWAP-SPACE",		probe_swap0 },
1345  { "swap",	 0, 0x7ff6, 10, "SWAPSPACE2",		probe_swap1 },
1346  { "swsuspend", 0, 0x7ff6,  9, "S1SUSPEND",		probe_swap1 },
1347  { "swsuspend", 0, 0x7ff6,  9, "S2SUSPEND",		probe_swap1 },
1348  { "swap",	 0, 0xfff6, 10, "SWAP-SPACE",		probe_swap0 },
1349  { "swap",	 0, 0xfff6, 10, "SWAPSPACE2",		probe_swap1 },
1350  { "swsuspend", 0, 0xfff6,  9, "S1SUSPEND",		probe_swap1 },
1351  { "swsuspend", 0, 0xfff6,  9, "S2SUSPEND",		probe_swap1 },
1352  { "ocfs",	 0,	 8,  9,	"OracleCFS",		probe_ocfs },
1353  { "ocfs2",	 1,	 0,  6,	"OCFSV2",		probe_ocfs2 },
1354  { "ocfs2",	 2,	 0,  6,	"OCFSV2",		probe_ocfs2 },
1355  { "ocfs2",	 4,	 0,  6,	"OCFSV2",		probe_ocfs2 },
1356  { "ocfs2",	 8,	 0,  6,	"OCFSV2",		probe_ocfs2 },
1357  { "crypt_LUKS", 0,	 0,  6,	"LUKS\xba\xbe",		probe_luks },
1358  { "squashfs",	 0,	 0,  4,	"sqsh",			0 },
1359  { "squashfs",	 0,	 0,  4,	"hsqs",			0 },
1360  { "lvm2pv",	 0,  0x218,  8, "LVM2 001",		probe_lvm2 },
1361  { "lvm2pv",	 0,  0x018,  8, "LVM2 001",		probe_lvm2 },
1362  { "lvm2pv",	 1,  0x018,  8, "LVM2 001",		probe_lvm2 },
1363  { "lvm2pv",	 1,  0x218,  8, "LVM2 001",		probe_lvm2 },
1364  {   NULL,	 0,	 0,  0, NULL,			NULL }
1365};
1366
1367/*
1368 * Verify that the data in dev is consistent with what is on the actual
1369 * block device (using the devname field only).  Normally this will be
1370 * called when finding items in the cache, but for long running processes
1371 * is also desirable to revalidate an item before use.
1372 *
1373 * If we are unable to revalidate the data, we return the old data and
1374 * do not set the BLKID_BID_FL_VERIFIED flag on it.
1375 */
1376blkid_dev blkid_verify(blkid_cache cache, blkid_dev dev)
1377{
1378	struct blkid_magic *id;
1379	struct blkid_probe probe;
1380	blkid_tag_iterate iter;
1381	unsigned char *buf;
1382	const char *type, *value;
1383	struct stat st;
1384	time_t diff, now;
1385	int idx;
1386
1387	if (!dev)
1388		return NULL;
1389
1390	now = time(0);
1391	diff = now - dev->bid_time;
1392
1393	if (stat(dev->bid_name, &st) < 0) {
1394		DBG(DEBUG_PROBE,
1395		    printf("blkid_verify: error %s (%d) while "
1396			   "trying to stat %s\n", strerror(errno), errno,
1397			   dev->bid_name));
1398	open_err:
1399		if ((errno == EPERM) || (errno == EACCES) || (errno == ENOENT)) {
1400			/* We don't have read permission, just return cache data. */
1401			DBG(DEBUG_PROBE, printf("returning unverified data for %s\n",
1402						dev->bid_name));
1403			return dev;
1404		}
1405		blkid_free_dev(dev);
1406		return NULL;
1407	}
1408
1409	if ((now >= dev->bid_time) &&
1410	    (st.st_mtime <= dev->bid_time) &&
1411	    ((diff < BLKID_PROBE_MIN) ||
1412	     (dev->bid_flags & BLKID_BID_FL_VERIFIED &&
1413	      diff < BLKID_PROBE_INTERVAL)))
1414		return dev;
1415
1416	DBG(DEBUG_PROBE,
1417	    printf("need to revalidate %s (cache time %lu, stat time %lu,\n\t"
1418		   "time since last check %lu)\n",
1419		   dev->bid_name, (unsigned long)dev->bid_time,
1420		   (unsigned long)st.st_mtime, (unsigned long)diff));
1421
1422	if ((probe.fd = open(dev->bid_name, O_RDONLY)) < 0) {
1423		DBG(DEBUG_PROBE, printf("blkid_verify: error %s (%d) while "
1424					"opening %s\n", strerror(errno), errno,
1425					dev->bid_name));
1426		goto open_err;
1427	}
1428
1429	probe.cache = cache;
1430	probe.dev = dev;
1431	probe.sbbuf = 0;
1432	probe.buf = 0;
1433	probe.buf_max = 0;
1434
1435	/*
1436	 * Iterate over the type array.  If we already know the type,
1437	 * then try that first.  If it doesn't work, then blow away
1438	 * the type information, and try again.
1439	 *
1440	 */
1441try_again:
1442	type = 0;
1443	if (!dev->bid_type || !strcmp(dev->bid_type, "mdraid")) {
1444		uuid_t	uuid;
1445
1446		if (check_mdraid(probe.fd, uuid) == 0) {
1447			set_uuid(dev, uuid, 0);
1448			type = "mdraid";
1449			goto found_type;
1450		}
1451	}
1452	for (id = type_array; id->bim_type; id++) {
1453		if (dev->bid_type &&
1454		    strcmp(id->bim_type, dev->bid_type))
1455			continue;
1456
1457		idx = id->bim_kboff + (id->bim_sboff >> 10);
1458		buf = get_buffer(&probe, idx << 10, 1024);
1459		if (!buf)
1460			continue;
1461
1462		if (memcmp(id->bim_magic, buf + (id->bim_sboff & 0x3ff),
1463			   id->bim_len))
1464			continue;
1465
1466		if ((id->bim_probe == NULL) ||
1467		    (id->bim_probe(&probe, id, buf) == 0)) {
1468			type = id->bim_type;
1469			goto found_type;
1470		}
1471	}
1472
1473	if (!id->bim_type && dev->bid_type) {
1474		/*
1475		 * Zap the device filesystem information and try again
1476		 */
1477		DBG(DEBUG_PROBE,
1478		    printf("previous fs type %s not valid, "
1479			   "trying full probe\n", dev->bid_type));
1480		iter = blkid_tag_iterate_begin(dev);
1481		while (blkid_tag_next(iter, &type, &value) == 0)
1482			blkid_set_tag(dev, type, 0, 0);
1483		blkid_tag_iterate_end(iter);
1484		goto try_again;
1485	}
1486
1487	if (!dev->bid_type) {
1488		blkid_free_dev(dev);
1489		dev = 0;
1490		goto found_type;
1491	}
1492
1493found_type:
1494	if (dev && type) {
1495		dev->bid_devno = st.st_rdev;
1496		dev->bid_time = time(0);
1497		dev->bid_flags |= BLKID_BID_FL_VERIFIED;
1498		cache->bic_flags |= BLKID_BIC_FL_CHANGED;
1499
1500		blkid_set_tag(dev, "TYPE", type, 0);
1501
1502		DBG(DEBUG_PROBE, printf("%s: devno 0x%04llx, type %s\n",
1503			   dev->bid_name, (long long)st.st_rdev, type));
1504	}
1505
1506	if (probe.sbbuf)
1507		free(probe.sbbuf);
1508	if (probe.buf)
1509		free(probe.buf);
1510	if (probe.fd >= 0)
1511		close(probe.fd);
1512
1513	return dev;
1514}
1515
1516int blkid_known_fstype(const char *fstype)
1517{
1518	struct blkid_magic *id;
1519
1520	for (id = type_array; id->bim_type; id++) {
1521		if (strcmp(fstype, id->bim_type) == 0)
1522			return 1;
1523	}
1524	return 0;
1525}
1526
1527#ifdef TEST_PROGRAM
1528int main(int argc, char **argv)
1529{
1530	blkid_dev dev;
1531	blkid_cache cache;
1532	int ret;
1533
1534	if (argc != 2) {
1535		fprintf(stderr, "Usage: %s device\n"
1536			"Probe a single device to determine type\n", argv[0]);
1537		exit(1);
1538	}
1539	if ((ret = blkid_get_cache(&cache, "/dev/null")) != 0) {
1540		fprintf(stderr, "%s: error creating cache (%d)\n",
1541			argv[0], ret);
1542		exit(1);
1543	}
1544	dev = blkid_get_dev(cache, argv[1], BLKID_DEV_NORMAL);
1545	if (!dev) {
1546		printf("%s: %s has an unsupported type\n", argv[0], argv[1]);
1547		return (1);
1548	}
1549	printf("TYPE='%s'\n", dev->bid_type ? dev->bid_type : "(null)");
1550	if (dev->bid_label)
1551		printf("LABEL='%s'\n", dev->bid_label);
1552	if (dev->bid_uuid)
1553		printf("UUID='%s'\n", dev->bid_uuid);
1554
1555	blkid_free_dev(dev);
1556	return (0);
1557}
1558#endif
1559