Home | History | Annotate | Download | only in blkid
      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 (at) 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 #ifdef __linux__
     30 #include <sys/utsname.h>
     31 #endif
     32 #ifdef HAVE_ERRNO_H
     33 #include <errno.h>
     34 #endif
     35 #include "blkidP.h"
     36 #include "uuid/uuid.h"
     37 #include "probe.h"
     38 
     39 static int figure_label_len(const unsigned char *label, int len)
     40 {
     41 	const unsigned char *end = label + len - 1;
     42 
     43 	while ((*end == ' ' || *end == 0) && end >= label)
     44 		--end;
     45 	if (end >= label) {
     46 		label = label;
     47 		return end - label + 1;
     48 	}
     49 	return 0;
     50 }
     51 
     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  */
     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 
    111 	/* Check for magic number */
    112 	if (memcmp("\251+N\374", buf, 4) && memcmp("\374N+\251", buf, 4))
    113 		return -BLKID_ERR_PARAM;
    114 
    115 	if (!ret_uuid)
    116 		return 0;
    117 	*ret_uuid = 0;
    118 
    119 	/* The MD UUID is not contiguous in the superblock, make it so */
    120 	md = (struct mdp_superblock_s *)buf;
    121 	if (md->set_uuid0 || md->set_uuid1 || md->set_uuid2 || md->set_uuid3) {
    122 		memcpy(ret_uuid, &md->set_uuid0, 4);
    123 		memcpy(ret_uuid + 4, &md->set_uuid1, 12);
    124 	}
    125 	return 0;
    126 }
    127 
    128 static void set_uuid(blkid_dev dev, uuid_t uuid, const char *tag)
    129 {
    130 	char	str[37];
    131 
    132 	if (!uuid_is_null(uuid)) {
    133 		uuid_unparse(uuid, str);
    134 		blkid_set_tag(dev, tag ? tag : "UUID", str, sizeof(str));
    135 	}
    136 }
    137 
    138 static void get_ext2_info(blkid_dev dev, struct blkid_magic *id,
    139 			  unsigned char *buf)
    140 {
    141 	struct ext2_super_block *es = (struct ext2_super_block *) buf;
    142 	const char *label = 0;
    143 
    144 	DBG(DEBUG_PROBE, printf("ext2_sb.compat = %08X:%08X:%08X\n",
    145 		   blkid_le32(es->s_feature_compat),
    146 		   blkid_le32(es->s_feature_incompat),
    147 		   blkid_le32(es->s_feature_ro_compat)));
    148 
    149 	if (strlen(es->s_volume_name))
    150 		label = es->s_volume_name;
    151 	blkid_set_tag(dev, "LABEL", label, sizeof(es->s_volume_name));
    152 
    153 	set_uuid(dev, es->s_uuid, 0);
    154 
    155 	if ((es->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
    156 	    !uuid_is_null(es->s_journal_uuid))
    157 		set_uuid(dev, es->s_journal_uuid, "EXT_JOURNAL");
    158 
    159 	if (strcmp(id->bim_type, "ext2") &&
    160 	    ((blkid_le32(es->s_feature_incompat) &
    161 	      EXT2_FEATURE_INCOMPAT_UNSUPPORTED) == 0))
    162 		blkid_set_tag(dev, "SEC_TYPE", "ext2", sizeof("ext2"));
    163 }
    164 
    165 /*
    166  * Check to see if a filesystem is in /proc/filesystems.
    167  * Returns 1 if found, 0 if not
    168  */
    169 static int fs_proc_check(const char *fs_name)
    170 {
    171 	FILE	*f;
    172 	char	buf[80], *cp, *t;
    173 
    174 	f = fopen("/proc/filesystems", "r");
    175 	if (!f)
    176 		return (0);
    177 	while (!feof(f)) {
    178 		if (!fgets(buf, sizeof(buf), f))
    179 			break;
    180 		cp = buf;
    181 		if (!isspace(*cp)) {
    182 			while (*cp && !isspace(*cp))
    183 				cp++;
    184 		}
    185 		while (*cp && isspace(*cp))
    186 			cp++;
    187 		if ((t = strchr(cp, '\n')) != NULL)
    188 			*t = 0;
    189 		if ((t = strchr(cp, '\t')) != NULL)
    190 			*t = 0;
    191 		if ((t = strchr(cp, ' ')) != NULL)
    192 			*t = 0;
    193 		if (!strcmp(fs_name, cp)) {
    194 			fclose(f);
    195 			return (1);
    196 		}
    197 	}
    198 	fclose(f);
    199 	return (0);
    200 }
    201 
    202 /*
    203  * Check to see if a filesystem is available as a module
    204  * Returns 1 if found, 0 if not
    205  */
    206 static int check_for_modules(const char *fs_name)
    207 {
    208 #ifdef __linux__
    209 	struct utsname	uts;
    210 	FILE		*f;
    211 	char		buf[1024], *cp;
    212 	int		namesz;
    213 
    214 	if (uname(&uts))
    215 		return (0);
    216 	snprintf(buf, sizeof(buf), "/lib/modules/%s/modules.dep", uts.release);
    217 
    218 	f = fopen(buf, "r");
    219 	if (!f)
    220 		return (0);
    221 
    222 	namesz = strlen(fs_name);
    223 
    224 	while (!feof(f)) {
    225 		if (!fgets(buf, sizeof(buf), f))
    226 			break;
    227 		if ((cp = strchr(buf, ':')) != NULL)
    228 			*cp = 0;
    229 		else
    230 			continue;
    231 		if ((cp = strrchr(buf, '/')) != NULL)
    232 			cp++;
    233 		else
    234 			cp = buf;
    235 		if (!strncmp(cp, fs_name, namesz) &&
    236 		    (!strcmp(cp + namesz, ".ko") ||
    237 		     !strcmp(cp + namesz, ".ko.gz"))) {
    238 			fclose(f);
    239 			return (1);
    240 		}
    241 	}
    242 	fclose(f);
    243 #endif
    244 	return (0);
    245 }
    246 
    247 static int linux_version_code()
    248 {
    249 #ifdef __linux__
    250 	struct utsname	ut;
    251 	static		version_code = -1;
    252 	int		major, minor, rev;
    253 	char		*endptr;
    254 	const char 	*cp;
    255 
    256 	if (version_code > 0)
    257 		return version_code;
    258 
    259 	if (uname(&ut))
    260 		return 0;
    261 	cp = ut.release;
    262 
    263 	major = strtol(cp, &endptr, 10);
    264 	if (cp == endptr || *endptr != '.')
    265 		return 0;
    266 	cp = endptr + 1;
    267 	minor = strtol(cp, &endptr, 10);
    268 	if (cp == endptr || *endptr != '.')
    269 		return 0;
    270 	cp = endptr + 1;
    271 	rev = strtol(cp, &endptr, 10);
    272 	if (cp == endptr)
    273 		return 0;
    274 	version_code = (((major * 256) + minor) * 256) + rev;
    275 	return version_code;
    276 #else
    277 	return 0;
    278 #endif
    279 }
    280 
    281 #define EXT4_SUPPORTS_EXT2 (2 * 65536 + 6*256 + 29)
    282 
    283 static int system_supports_ext2(void)
    284 {
    285 	static time_t	last_check = 0;
    286 	static int	ret = -1;
    287 	time_t		now = time(0);
    288 
    289 	if (ret != -1 || (now - last_check) < 5)
    290 		return ret;
    291 	last_check = now;
    292 	ret = (fs_proc_check("ext2") || check_for_modules("ext2"));
    293 	return ret;
    294 }
    295 
    296 static int system_supports_ext4(void)
    297 {
    298 	static time_t	last_check = 0;
    299 	static int	ret = -1;
    300 	time_t		now = time(0);
    301 
    302 	if (ret != -1 || (now - last_check) < 5)
    303 		return ret;
    304 	last_check = now;
    305 	ret = (fs_proc_check("ext4") || check_for_modules("ext4"));
    306 	return ret;
    307 }
    308 
    309 static int system_supports_ext4dev(void)
    310 {
    311 	static time_t	last_check = 0;
    312 	static int	ret = -1;
    313 	time_t		now = time(0);
    314 
    315 	if (ret != -1 || (now - last_check) < 5)
    316 		return ret;
    317 	last_check = now;
    318 	ret = (fs_proc_check("ext4dev") || check_for_modules("ext4dev"));
    319 	return ret;
    320 }
    321 
    322 static int probe_ext4dev(struct blkid_probe *probe,
    323 			 struct blkid_magic *id,
    324 			 unsigned char *buf)
    325 {
    326 	struct ext2_super_block *es;
    327 	es = (struct ext2_super_block *)buf;
    328 
    329 	/* Distinguish from jbd */
    330 	if (blkid_le32(es->s_feature_incompat) &
    331 	    EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)
    332 		return -BLKID_ERR_PARAM;
    333 
    334 	/*
    335 	 * If the filesystem does not have a journal and ext2 and ext4
    336 	 * is not present, then force this to be detected as an
    337 	 * ext4dev filesystem.
    338 	 */
    339 	if (!(blkid_le32(es->s_feature_compat) &
    340 	      EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
    341 	    !system_supports_ext2() && !system_supports_ext4() &&
    342 	    system_supports_ext4dev() &&
    343 	    linux_version_code() >= EXT4_SUPPORTS_EXT2)
    344 		goto force_ext4dev;
    345 
    346 	/*
    347 	 * If the filesystem is marked as OK for use by in-development
    348 	 * filesystem code, but ext4dev is not supported, and ext4 is,
    349 	 * then don't call ourselves ext4dev, since we should be
    350 	 * detected as ext4 in that case.
    351 	 *
    352 	 * If the filesystem is marked as in use by production
    353 	 * filesystem, then it can only be used by ext4 and NOT by
    354 	 * ext4dev, so always disclaim we are ext4dev in that case.
    355 	 */
    356 	if (blkid_le32(es->s_flags) & EXT2_FLAGS_TEST_FILESYS) {
    357 		if (!system_supports_ext4dev() && system_supports_ext4())
    358 			return -BLKID_ERR_PARAM;
    359 	} else
    360 		return -BLKID_ERR_PARAM;
    361 
    362 force_ext4dev:
    363     	get_ext2_info(probe->dev, id, buf);
    364 	return 0;
    365 }
    366 
    367 static int probe_ext4(struct blkid_probe *probe, struct blkid_magic *id,
    368 		      unsigned char *buf)
    369 {
    370 	struct ext2_super_block *es;
    371 	es = (struct ext2_super_block *)buf;
    372 
    373 	/* Distinguish from jbd */
    374 	if (blkid_le32(es->s_feature_incompat) &
    375 	    EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)
    376 		return -BLKID_ERR_PARAM;
    377 
    378 	/*
    379 	 * If the filesystem does not have a journal and ext2 is not
    380 	 * present, then force this to be detected as an ext2
    381 	 * filesystem.
    382 	 */
    383 	if (!(blkid_le32(es->s_feature_compat) &
    384 	      EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
    385 	    !system_supports_ext2() && system_supports_ext4() &&
    386 	    linux_version_code() >= EXT4_SUPPORTS_EXT2)
    387 		goto force_ext4;
    388 
    389 	/* Ext4 has at least one feature which ext3 doesn't understand */
    390 	if (!(blkid_le32(es->s_feature_ro_compat) &
    391 	      EXT3_FEATURE_RO_COMPAT_UNSUPPORTED) &&
    392 	    !(blkid_le32(es->s_feature_incompat) &
    393 	      EXT3_FEATURE_INCOMPAT_UNSUPPORTED))
    394 		return -BLKID_ERR_PARAM;
    395 
    396 force_ext4:
    397 	/*
    398 	 * If the filesystem is a OK for use by in-development
    399 	 * filesystem code, and ext4dev is supported or ext4 is not
    400 	 * supported, then don't call ourselves ext4, so we can redo
    401 	 * the detection and mark the filesystem as ext4dev.
    402 	 *
    403 	 * If the filesystem is marked as in use by production
    404 	 * filesystem, then it can only be used by ext4 and NOT by
    405 	 * ext4dev.
    406 	 */
    407 	if (blkid_le32(es->s_flags) & EXT2_FLAGS_TEST_FILESYS) {
    408 		if (system_supports_ext4dev() || !system_supports_ext4())
    409 			return -BLKID_ERR_PARAM;
    410 	}
    411     	get_ext2_info(probe->dev, id, buf);
    412 	return 0;
    413 }
    414 
    415 static int probe_ext3(struct blkid_probe *probe, struct blkid_magic *id,
    416 		      unsigned char *buf)
    417 {
    418 	struct ext2_super_block *es;
    419 	es = (struct ext2_super_block *)buf;
    420 
    421 	/* ext3 requires journal */
    422 	if (!(blkid_le32(es->s_feature_compat) &
    423 	      EXT3_FEATURE_COMPAT_HAS_JOURNAL))
    424 		return -BLKID_ERR_PARAM;
    425 
    426 	/* Any features which ext3 doesn't understand */
    427 	if ((blkid_le32(es->s_feature_ro_compat) &
    428 	     EXT3_FEATURE_RO_COMPAT_UNSUPPORTED) ||
    429 	    (blkid_le32(es->s_feature_incompat) &
    430 	     EXT3_FEATURE_INCOMPAT_UNSUPPORTED))
    431 		return -BLKID_ERR_PARAM;
    432 
    433     	get_ext2_info(probe->dev, id, buf);
    434 	return 0;
    435 }
    436 
    437 static int probe_ext2(struct blkid_probe *probe, struct blkid_magic *id,
    438 		      unsigned char *buf)
    439 {
    440 	struct ext2_super_block *es;
    441 
    442 	es = (struct ext2_super_block *)buf;
    443 
    444 	/* Distinguish between ext3 and ext2 */
    445 	if ((blkid_le32(es->s_feature_compat) &
    446 	      EXT3_FEATURE_COMPAT_HAS_JOURNAL))
    447 		return -BLKID_ERR_PARAM;
    448 
    449 	/* Any features which ext2 doesn't understand */
    450 	if ((blkid_le32(es->s_feature_ro_compat) &
    451 	     EXT2_FEATURE_RO_COMPAT_UNSUPPORTED) ||
    452 	    (blkid_le32(es->s_feature_incompat) &
    453 	     EXT2_FEATURE_INCOMPAT_UNSUPPORTED))
    454 		return -BLKID_ERR_PARAM;
    455 
    456 	/*
    457 	 * If ext2 is not present, but ext4 or ext4dev are, then
    458 	 * disclaim we are ext2
    459 	 */
    460 	if (!system_supports_ext2() &&
    461 	    (system_supports_ext4() || system_supports_ext4dev()) &&
    462 	    linux_version_code() >= EXT4_SUPPORTS_EXT2)
    463 		return -BLKID_ERR_PARAM;
    464 
    465 	get_ext2_info(probe->dev, id, buf);
    466 	return 0;
    467 }
    468 
    469 static int probe_jbd(struct blkid_probe *probe, struct blkid_magic *id,
    470 		     unsigned char *buf)
    471 {
    472 	struct ext2_super_block *es = (struct ext2_super_block *) buf;
    473 
    474 	if (!(blkid_le32(es->s_feature_incompat) &
    475 	      EXT3_FEATURE_INCOMPAT_JOURNAL_DEV))
    476 		return -BLKID_ERR_PARAM;
    477 
    478 	get_ext2_info(probe->dev, id, buf);
    479 
    480 	return 0;
    481 }
    482 
    483 #define FAT_ATTR_VOLUME_ID		0x08
    484 #define FAT_ATTR_DIR			0x10
    485 #define FAT_ATTR_LONG_NAME		0x0f
    486 #define FAT_ATTR_MASK			0x3f
    487 #define FAT_ENTRY_FREE			0xe5
    488 
    489 static const char *no_name = "NO NAME    ";
    490 
    491 static unsigned char *search_fat_label(struct vfat_dir_entry *dir, int count)
    492 {
    493 	int i;
    494 
    495 	for (i = 0; i < count; i++) {
    496 		if (dir[i].name[0] == 0x00)
    497 			break;
    498 
    499 		if ((dir[i].name[0] == FAT_ENTRY_FREE) ||
    500 		    (dir[i].cluster_high != 0 || dir[i].cluster_low != 0) ||
    501 		    ((dir[i].attr & FAT_ATTR_MASK) == FAT_ATTR_LONG_NAME))
    502 			continue;
    503 
    504 		if ((dir[i].attr & (FAT_ATTR_VOLUME_ID | FAT_ATTR_DIR)) ==
    505 		    FAT_ATTR_VOLUME_ID) {
    506 			return dir[i].name;
    507 		}
    508 	}
    509 	return 0;
    510 }
    511 
    512 /* FAT label extraction from the root directory taken from Kay
    513  * Sievers's volume_id library */
    514 static int probe_fat(struct blkid_probe *probe,
    515 		      struct blkid_magic *id __BLKID_ATTR((unused)),
    516 		      unsigned char *buf)
    517 {
    518 	struct vfat_super_block *vs = (struct vfat_super_block *) buf;
    519 	struct msdos_super_block *ms = (struct msdos_super_block *) buf;
    520 	struct vfat_dir_entry *dir;
    521 	char serno[10];
    522 	const unsigned char *label = 0, *vol_label = 0, *tmp;
    523 	unsigned char	*vol_serno;
    524 	int label_len = 0, maxloop = 100;
    525 	__u16 sector_size, dir_entries, reserved;
    526 	__u32 sect_count, fat_size, dir_size, cluster_count, fat_length;
    527 	__u32 buf_size, start_data_sect, next, root_start, root_dir_entries;
    528 
    529 	/* sector size check */
    530 	tmp = (unsigned char *)&ms->ms_sector_size;
    531 	sector_size = tmp[0] + (tmp[1] << 8);
    532 	if (sector_size != 0x200 && sector_size != 0x400 &&
    533 	    sector_size != 0x800 && sector_size != 0x1000)
    534 		return 1;
    535 
    536 	tmp = (unsigned char *)&ms->ms_dir_entries;
    537 	dir_entries = tmp[0] + (tmp[1] << 8);
    538 	reserved =  blkid_le16(ms->ms_reserved);
    539 	tmp = (unsigned char *)&ms->ms_sectors;
    540 	sect_count = tmp[0] + (tmp[1] << 8);
    541 	if (sect_count == 0)
    542 		sect_count = blkid_le32(ms->ms_total_sect);
    543 
    544 	fat_length = blkid_le16(ms->ms_fat_length);
    545 	if (fat_length == 0)
    546 		fat_length = blkid_le32(vs->vs_fat32_length);
    547 
    548 	fat_size = fat_length * ms->ms_fats;
    549 	dir_size = ((dir_entries * sizeof(struct vfat_dir_entry)) +
    550 			(sector_size-1)) / sector_size;
    551 
    552 	cluster_count = sect_count - (reserved + fat_size + dir_size);
    553 	if (ms->ms_cluster_size == 0)
    554 		return 1;
    555 	cluster_count /= ms->ms_cluster_size;
    556 
    557 	if (cluster_count > FAT32_MAX)
    558 		return 1;
    559 
    560 	if (ms->ms_fat_length) {
    561 		/* the label may be an attribute in the root directory */
    562 		root_start = (reserved + fat_size) * sector_size;
    563 		root_dir_entries = vs->vs_dir_entries[0] +
    564 			(vs->vs_dir_entries[1] << 8);
    565 
    566 		buf_size = root_dir_entries * sizeof(struct vfat_dir_entry);
    567 		dir = (struct vfat_dir_entry *) get_buffer(probe, root_start,
    568 							   buf_size);
    569 		if (dir)
    570 			vol_label = search_fat_label(dir, root_dir_entries);
    571 
    572 		if (!vol_label || !memcmp(vol_label, no_name, 11))
    573 			vol_label = ms->ms_label;
    574 		vol_serno = ms->ms_serno;
    575 
    576 		blkid_set_tag(probe->dev, "SEC_TYPE", "msdos",
    577 			      sizeof("msdos"));
    578 	} else {
    579 		/* Search the FAT32 root dir for the label attribute */
    580 		buf_size = vs->vs_cluster_size * sector_size;
    581 		start_data_sect = reserved + fat_size;
    582 
    583 		next = blkid_le32(vs->vs_root_cluster);
    584 		while (next && --maxloop) {
    585 			__u32 next_sect_off;
    586 			__u64 next_off, fat_entry_off;
    587 			int count;
    588 
    589 			next_sect_off = (next - 2) * vs->vs_cluster_size;
    590 			next_off = (start_data_sect + next_sect_off) *
    591 				sector_size;
    592 
    593 			dir = (struct vfat_dir_entry *)
    594 				get_buffer(probe, next_off, buf_size);
    595 			if (dir == NULL)
    596 				break;
    597 
    598 			count = buf_size / sizeof(struct vfat_dir_entry);
    599 
    600 			vol_label = search_fat_label(dir, count);
    601 			if (vol_label)
    602 				break;
    603 
    604 			/* get FAT entry */
    605 			fat_entry_off = (reserved * sector_size) +
    606 				(next * sizeof(__u32));
    607 			buf = get_buffer(probe, fat_entry_off, buf_size);
    608 			if (buf == NULL)
    609 				break;
    610 
    611 			/* set next cluster */
    612 			next = blkid_le32(*((__u32 *) buf) & 0x0fffffff);
    613 		}
    614 
    615 		if (!vol_label || !memcmp(vol_label, no_name, 11))
    616 			vol_label = vs->vs_label;
    617 		vol_serno = vs->vs_serno;
    618 	}
    619 
    620 	if (vol_label && memcmp(vol_label, no_name, 11)) {
    621 		if ((label_len = figure_label_len(vol_label, 11)))
    622 			label = vol_label;
    623 	}
    624 
    625 	/* We can't just print them as %04X, because they are unaligned */
    626 	sprintf(serno, "%02X%02X-%02X%02X", vol_serno[3], vol_serno[2],
    627 		vol_serno[1], vol_serno[0]);
    628 
    629 	blkid_set_tag(probe->dev, "LABEL", (const char *) label, label_len);
    630 	blkid_set_tag(probe->dev, "UUID", serno, sizeof(serno)-1);
    631 
    632 	return 0;
    633 }
    634 
    635 /*
    636  * The FAT filesystem could be without a magic string in superblock
    637  * (e.g. old floppies).  This heuristic for FAT detection is inspired
    638  * by http://vrfy.org/projects/volume_id/ and Linux kernel.
    639  * [7-Jul-2005, Karel Zak <kzak (at) redhat.com>]
    640  */
    641 static int probe_fat_nomagic(struct blkid_probe *probe,
    642 			     struct blkid_magic *id __BLKID_ATTR((unused)),
    643 			     unsigned char *buf)
    644 {
    645 	struct msdos_super_block *ms;
    646 
    647 	ms = (struct msdos_super_block *)buf;
    648 
    649 	/* heads check */
    650 	if (ms->ms_heads == 0)
    651 		return 1;
    652 
    653 	/* cluster size check*/
    654 	if (ms->ms_cluster_size == 0 ||
    655 	    (ms->ms_cluster_size & (ms->ms_cluster_size-1)))
    656 		return 1;
    657 
    658 	/* media check */
    659 	if (ms->ms_media < 0xf8 && ms->ms_media != 0xf0)
    660 		return 1;
    661 
    662 	/* fat counts(Linux kernel expects at least 1 FAT table) */
    663 	if (!ms->ms_fats)
    664 		return 1;
    665 
    666 	/*
    667 	 * OS/2 and apparently DFSee will place a FAT12/16-like
    668 	 * pseudo-superblock in the first 512 bytes of non-FAT
    669 	 * filesystems --- at least JFS and HPFS, and possibly others.
    670 	 * So we explicitly check for those filesystems at the
    671 	 * FAT12/16 filesystem magic field identifier, and if they are
    672 	 * present, we rule this out as a FAT filesystem, despite the
    673 	 * FAT-like pseudo-header.
    674          */
    675 	if ((memcmp(ms->ms_magic, "JFS     ", 8) == 0) ||
    676 	    (memcmp(ms->ms_magic, "HPFS    ", 8) == 0))
    677 		return 1;
    678 
    679 	return probe_fat(probe, id, buf);
    680 }
    681 
    682 static int probe_ntfs(struct blkid_probe *probe,
    683 		      struct blkid_magic *id __BLKID_ATTR((unused)),
    684 		      unsigned char *buf)
    685 {
    686 	struct ntfs_super_block *ns;
    687 	struct master_file_table_record *mft;
    688 	struct file_attribute *attr;
    689 	char		uuid_str[17], label_str[129], *cp;
    690 	int		bytes_per_sector, sectors_per_cluster;
    691 	int		mft_record_size, attr_off, attr_len;
    692 	unsigned int	i, attr_type, val_len;
    693 	int		val_off;
    694 	__u64		nr_clusters;
    695 	blkid_loff_t off;
    696 	unsigned char *buf_mft, *val;
    697 
    698 	ns = (struct ntfs_super_block *) buf;
    699 
    700 	bytes_per_sector = ns->bios_parameter_block[0] +
    701 		(ns->bios_parameter_block[1]  << 8);
    702 	sectors_per_cluster = ns->bios_parameter_block[2];
    703 
    704 	if ((bytes_per_sector < 512) || (sectors_per_cluster == 0))
    705 		return 1;
    706 
    707 	if (ns->cluster_per_mft_record < 0)
    708 		mft_record_size = 1 << (0-ns->cluster_per_mft_record);
    709 	else
    710 		mft_record_size = ns->cluster_per_mft_record *
    711 			sectors_per_cluster * bytes_per_sector;
    712 	nr_clusters = blkid_le64(ns->number_of_sectors) / sectors_per_cluster;
    713 
    714 	if ((blkid_le64(ns->mft_cluster_location) > nr_clusters) ||
    715 	    (blkid_le64(ns->mft_mirror_cluster_location) > nr_clusters))
    716 		return 1;
    717 
    718 	off = blkid_le64(ns->mft_mirror_cluster_location) *
    719 		bytes_per_sector * sectors_per_cluster;
    720 
    721 	buf_mft = get_buffer(probe, off, mft_record_size);
    722 	if (!buf_mft)
    723 		return 1;
    724 
    725 	if (memcmp(buf_mft, "FILE", 4))
    726 		return 1;
    727 
    728 	off = blkid_le64(ns->mft_cluster_location) * bytes_per_sector *
    729 		sectors_per_cluster;
    730 
    731 	buf_mft = get_buffer(probe, off, mft_record_size);
    732 	if (!buf_mft)
    733 		return 1;
    734 
    735 	if (memcmp(buf_mft, "FILE", 4))
    736 		return 1;
    737 
    738 	off += MFT_RECORD_VOLUME * mft_record_size;
    739 
    740 	buf_mft = get_buffer(probe, off, mft_record_size);
    741 	if (!buf_mft)
    742 		return 1;
    743 
    744 	if (memcmp(buf_mft, "FILE", 4))
    745 		return 1;
    746 
    747 	mft = (struct master_file_table_record *) buf_mft;
    748 
    749 	attr_off = blkid_le16(mft->attrs_offset);
    750 	label_str[0] = 0;
    751 
    752 	while (1) {
    753 		attr = (struct file_attribute *) (buf_mft + attr_off);
    754 		attr_len = blkid_le16(attr->len);
    755 		attr_type = blkid_le32(attr->type);
    756 		val_off = blkid_le16(attr->value_offset);
    757 		val_len = blkid_le32(attr->value_len);
    758 
    759 		attr_off += attr_len;
    760 
    761 		if ((attr_off > mft_record_size) ||
    762 		    (attr_len == 0))
    763 			break;
    764 
    765 		if (attr_type == MFT_RECORD_ATTR_END)
    766 			break;
    767 
    768 		if (attr_type == MFT_RECORD_ATTR_VOLUME_NAME) {
    769 			if (val_len > sizeof(label_str))
    770 				val_len = sizeof(label_str)-1;
    771 
    772 			for (i=0, cp=label_str; i < val_len; i+=2,cp++) {
    773 				val = ((__u8 *) attr) + val_off + i;
    774 				*cp = val[0];
    775 				if (val[1])
    776 					*cp = '?';
    777 			}
    778 			*cp = 0;
    779 		}
    780 	}
    781 
    782 	sprintf(uuid_str, "%016llX", blkid_le64(ns->volume_serial));
    783 	blkid_set_tag(probe->dev, "UUID", uuid_str, 0);
    784 	if (label_str[0])
    785 		blkid_set_tag(probe->dev, "LABEL", label_str, 0);
    786 	return 0;
    787 }
    788 
    789 
    790 static int probe_xfs(struct blkid_probe *probe,
    791 		     struct blkid_magic *id __BLKID_ATTR((unused)),
    792 		     unsigned char *buf)
    793 {
    794 	struct xfs_super_block *xs;
    795 	const char *label = 0;
    796 
    797 	xs = (struct xfs_super_block *)buf;
    798 
    799 	if (strlen(xs->xs_fname))
    800 		label = xs->xs_fname;
    801 	blkid_set_tag(probe->dev, "LABEL", label, sizeof(xs->xs_fname));
    802 	set_uuid(probe->dev, xs->xs_uuid, 0);
    803 	return 0;
    804 }
    805 
    806 static int probe_reiserfs(struct blkid_probe *probe,
    807 			  struct blkid_magic *id, unsigned char *buf)
    808 {
    809 	struct reiserfs_super_block *rs = (struct reiserfs_super_block *) buf;
    810 	unsigned int blocksize;
    811 	const char *label = 0;
    812 
    813 	blocksize = blkid_le16(rs->rs_blocksize);
    814 
    815 	/* The blocksize must be at least 1k */
    816 	if ((blocksize >> 10) == 0)
    817 		return -BLKID_ERR_PARAM;
    818 
    819 	/* If the superblock is inside the journal, we have the wrong one */
    820 	if (id->bim_kboff/(blocksize>>10) > blkid_le32(rs->rs_journal_block))
    821 		return -BLKID_ERR_BIG;
    822 
    823 	/* LABEL/UUID are only valid for later versions of Reiserfs v3.6. */
    824 	if (id->bim_magic[6] == '2' || id->bim_magic[6] == '3') {
    825 		if (strlen(rs->rs_label))
    826 			label = rs->rs_label;
    827 		set_uuid(probe->dev, rs->rs_uuid, 0);
    828 	}
    829 	blkid_set_tag(probe->dev, "LABEL", label, sizeof(rs->rs_label));
    830 
    831 	return 0;
    832 }
    833 
    834 static int probe_reiserfs4(struct blkid_probe *probe,
    835 			   struct blkid_magic *id __BLKID_ATTR((unused)),
    836 			   unsigned char *buf)
    837 {
    838 	struct reiser4_super_block *rs4 = (struct reiser4_super_block *) buf;
    839 	const unsigned char *label = 0;
    840 
    841 	if (strlen((char *) rs4->rs4_label))
    842 		label = rs4->rs4_label;
    843 	set_uuid(probe->dev, rs4->rs4_uuid, 0);
    844 	blkid_set_tag(probe->dev, "LABEL", (const char *) label,
    845 		      sizeof(rs4->rs4_label));
    846 
    847 	return 0;
    848 }
    849 
    850 static int probe_jfs(struct blkid_probe *probe,
    851 		     struct blkid_magic *id __BLKID_ATTR((unused)),
    852 		     unsigned char *buf)
    853 {
    854 	struct jfs_super_block *js;
    855 	const char *label = 0;
    856 
    857 	js = (struct jfs_super_block *)buf;
    858 
    859 	if (blkid_le32(js->js_bsize) != (1 << blkid_le16(js->js_l2bsize)))
    860 		return 1;
    861 
    862 	if (blkid_le32(js->js_pbsize) != (1 << blkid_le16(js->js_l2pbsize)))
    863 		return 1;
    864 
    865 	if ((blkid_le16(js->js_l2bsize) - blkid_le16(js->js_l2pbsize)) !=
    866 	    blkid_le16(js->js_l2bfactor))
    867 		return 1;
    868 
    869 	if (strlen((char *) js->js_label))
    870 		label = (char *) js->js_label;
    871 	blkid_set_tag(probe->dev, "LABEL", label, sizeof(js->js_label));
    872 	set_uuid(probe->dev, js->js_uuid, 0);
    873 	return 0;
    874 }
    875 
    876 static int probe_zfs(struct blkid_probe *probe, struct blkid_magic *id,
    877 		     unsigned char *buf)
    878 {
    879 #if 0
    880 	char *vdev_label;
    881 	const char *pool_name = 0;
    882 
    883 	/* read nvpair data for pool name, pool GUID (complex) */
    884 	blkid_set_tag(probe->dev, "LABEL", pool_name, sizeof(pool_name));
    885 	set_uuid(probe->dev, pool_guid, 0);
    886 #endif
    887 	return 0;
    888 }
    889 
    890 static int probe_luks(struct blkid_probe *probe,
    891 		       struct blkid_magic *id __BLKID_ATTR((unused)),
    892 		       unsigned char *buf)
    893 {
    894 	char uuid[40];
    895 
    896 	/* 168 is the offset to the 40 character uuid:
    897 	 * http://luks.endorphin.org/LUKS-on-disk-format.pdf */
    898 	strncpy(uuid, (char *) buf+168, 40);
    899 	blkid_set_tag(probe->dev, "UUID", uuid, sizeof(uuid));
    900 	return 0;
    901 }
    902 
    903 static int probe_romfs(struct blkid_probe *probe,
    904 		       struct blkid_magic *id __BLKID_ATTR((unused)),
    905 		       unsigned char *buf)
    906 {
    907 	struct romfs_super_block *ros;
    908 	const char *label = 0;
    909 
    910 	ros = (struct romfs_super_block *)buf;
    911 
    912 	if (strlen((char *) ros->ros_volume))
    913 		label = (char *) ros->ros_volume;
    914 	blkid_set_tag(probe->dev, "LABEL", label, 0);
    915 	return 0;
    916 }
    917 
    918 static int probe_cramfs(struct blkid_probe *probe,
    919 			struct blkid_magic *id __BLKID_ATTR((unused)),
    920 			unsigned char *buf)
    921 {
    922 	struct cramfs_super_block *csb;
    923 	const char *label = 0;
    924 
    925 	csb = (struct cramfs_super_block *)buf;
    926 
    927 	if (strlen((char *) csb->name))
    928 		label = (char *) csb->name;
    929 	blkid_set_tag(probe->dev, "LABEL", label, 0);
    930 	return 0;
    931 }
    932 
    933 static int probe_swap0(struct blkid_probe *probe,
    934 		       struct blkid_magic *id __BLKID_ATTR((unused)),
    935 		       unsigned char *buf __BLKID_ATTR((unused)))
    936 {
    937 	blkid_set_tag(probe->dev, "UUID", 0, 0);
    938 	blkid_set_tag(probe->dev, "LABEL", 0, 0);
    939 	return 0;
    940 }
    941 
    942 static int probe_swap1(struct blkid_probe *probe,
    943 		       struct blkid_magic *id,
    944 		       unsigned char *buf __BLKID_ATTR((unused)))
    945 {
    946 	struct swap_id_block *sws;
    947 
    948 	probe_swap0(probe, id, buf);
    949 	/*
    950 	 * Version 1 swap headers are always located at offset of 1024
    951 	 * bytes, although the swap signature itself is located at the
    952 	 * end of the page (which may vary depending on hardware
    953 	 * pagesize).
    954 	 */
    955 	sws = (struct swap_id_block *) get_buffer(probe, 1024, 1024);
    956 	if (!sws)
    957 		return 1;
    958 
    959 	/* check for wrong version or zeroed pagecount, for sanity */
    960 	if (!memcmp(id->bim_magic, "SWAPSPACE2", id->bim_len) &&
    961 			(sws->sws_version != 1 || sws->sws_lastpage == 0))
    962 		return 1;
    963 
    964 	/* arbitrary sanity check.. is there any garbage down there? */
    965 	if (sws->sws_pad[32] == 0 && sws->sws_pad[33] == 0)  {
    966 		if (sws->sws_volume[0])
    967 			blkid_set_tag(probe->dev, "LABEL", sws->sws_volume,
    968 				      sizeof(sws->sws_volume));
    969 		if (sws->sws_uuid[0])
    970 			set_uuid(probe->dev, sws->sws_uuid, 0);
    971 	}
    972 	return 0;
    973 }
    974 
    975 static int probe_iso9660(struct blkid_probe *probe,
    976 			 struct blkid_magic *id __BLKID_ATTR((unused)),
    977 			 unsigned char *buf)
    978 {
    979 	struct iso_volume_descriptor *iso;
    980 	const unsigned char *label;
    981 
    982 	iso = (struct iso_volume_descriptor *) buf;
    983 	label = iso->volume_id;
    984 
    985 	blkid_set_tag(probe->dev, "LABEL", (const char *) label,
    986 		      figure_label_len(label, 32));
    987 	return 0;
    988 }
    989 
    990 
    991 static const char
    992 *udf_magic[] = { "BEA01", "BOOT2", "CD001", "CDW02", "NSR02",
    993 		 "NSR03", "TEA01", 0 };
    994 
    995 static int probe_udf(struct blkid_probe *probe,
    996 		     struct blkid_magic *id __BLKID_ATTR((unused)),
    997 		     unsigned char *buf __BLKID_ATTR((unused)))
    998 {
    999 	int j, bs;
   1000 	struct iso_volume_descriptor *isosb;
   1001 	const char ** m;
   1002 
   1003 	/* determine the block size by scanning in 2K increments
   1004 	   (block sizes larger than 2K will be null padded) */
   1005 	for (bs = 1; bs < 16; bs++) {
   1006 		isosb = (struct iso_volume_descriptor *)
   1007 			get_buffer(probe, bs*2048+32768, sizeof(isosb));
   1008 		if (!isosb)
   1009 			return 1;
   1010 		if (isosb->vd_id[0])
   1011 			break;
   1012 	}
   1013 
   1014 	/* Scan up to another 64 blocks looking for additional VSD's */
   1015 	for (j = 1; j < 64; j++) {
   1016 		if (j > 1) {
   1017 			isosb = (struct iso_volume_descriptor *)
   1018 				get_buffer(probe, j*bs*2048+32768,
   1019 					   sizeof(isosb));
   1020 			if (!isosb)
   1021 				return 1;
   1022 		}
   1023 		/* If we find NSR0x then call it udf:
   1024 		   NSR01 for UDF 1.00
   1025 		   NSR02 for UDF 1.50
   1026 		   NSR03 for UDF 2.00 */
   1027 		if (!memcmp(isosb->vd_id, "NSR0", 4))
   1028 			return probe_iso9660(probe, id, buf);
   1029 		for (m = udf_magic; *m; m++)
   1030 			if (!memcmp(*m, isosb->vd_id, 5))
   1031 				break;
   1032 		if (*m == 0)
   1033 			return 1;
   1034 	}
   1035 	return 1;
   1036 }
   1037 
   1038 static int probe_ocfs(struct blkid_probe *probe,
   1039 		      struct blkid_magic *id __BLKID_ATTR((unused)),
   1040 		      unsigned char *buf)
   1041 {
   1042 	struct ocfs_volume_header ovh;
   1043 	struct ocfs_volume_label ovl;
   1044 	__u32 major;
   1045 
   1046 	memcpy(&ovh, buf, sizeof(ovh));
   1047 	memcpy(&ovl, buf+512, sizeof(ovl));
   1048 
   1049 	major = ocfsmajor(ovh);
   1050 	if (major == 1)
   1051 		blkid_set_tag(probe->dev,"SEC_TYPE","ocfs1",sizeof("ocfs1"));
   1052 	else if (major >= 9)
   1053 		blkid_set_tag(probe->dev,"SEC_TYPE","ntocfs",sizeof("ntocfs"));
   1054 
   1055 	blkid_set_tag(probe->dev, "LABEL", ovl.label, ocfslabellen(ovl));
   1056 	blkid_set_tag(probe->dev, "MOUNT", ovh.mount, ocfsmountlen(ovh));
   1057 	set_uuid(probe->dev, ovl.vol_id, 0);
   1058 	return 0;
   1059 }
   1060 
   1061 static int probe_ocfs2(struct blkid_probe *probe,
   1062 		       struct blkid_magic *id __BLKID_ATTR((unused)),
   1063 		       unsigned char *buf)
   1064 {
   1065 	struct ocfs2_super_block *osb;
   1066 
   1067 	osb = (struct ocfs2_super_block *)buf;
   1068 
   1069 	blkid_set_tag(probe->dev, "LABEL", osb->s_label, sizeof(osb->s_label));
   1070 	set_uuid(probe->dev, osb->s_uuid, 0);
   1071 	return 0;
   1072 }
   1073 
   1074 static int probe_oracleasm(struct blkid_probe *probe,
   1075 			   struct blkid_magic *id __BLKID_ATTR((unused)),
   1076 			   unsigned char *buf)
   1077 {
   1078 	struct oracle_asm_disk_label *dl;
   1079 
   1080 	dl = (struct oracle_asm_disk_label *)buf;
   1081 
   1082 	blkid_set_tag(probe->dev, "LABEL", dl->dl_id, sizeof(dl->dl_id));
   1083 	return 0;
   1084 }
   1085 
   1086 static int probe_gfs(struct blkid_probe *probe,
   1087 		     struct blkid_magic *id __BLKID_ATTR((unused)),
   1088 		     unsigned char *buf)
   1089 {
   1090 	struct gfs2_sb *sbd;
   1091 	const char *label = 0;
   1092 
   1093 	sbd = (struct gfs2_sb *)buf;
   1094 
   1095 	if (blkid_be32(sbd->sb_fs_format) == GFS_FORMAT_FS &&
   1096 	    blkid_be32(sbd->sb_multihost_format) == GFS_FORMAT_MULTI)
   1097 	{
   1098 		blkid_set_tag(probe->dev, "UUID", 0, 0);
   1099 
   1100 		if (strlen(sbd->sb_locktable))
   1101 			label = sbd->sb_locktable;
   1102 		blkid_set_tag(probe->dev, "LABEL", label, sizeof(sbd->sb_locktable));
   1103 		return 0;
   1104 	}
   1105 	return 1;
   1106 }
   1107 
   1108 static int probe_gfs2(struct blkid_probe *probe,
   1109 		     struct blkid_magic *id __BLKID_ATTR((unused)),
   1110 		     unsigned char *buf)
   1111 {
   1112 	struct gfs2_sb *sbd;
   1113 	const char *label = 0;
   1114 
   1115 	sbd = (struct gfs2_sb *)buf;
   1116 
   1117 	if (blkid_be32(sbd->sb_fs_format) == GFS2_FORMAT_FS &&
   1118 	    blkid_be32(sbd->sb_multihost_format) == GFS2_FORMAT_MULTI)
   1119 	{
   1120 		blkid_set_tag(probe->dev, "UUID", 0, 0);
   1121 
   1122 		if (strlen(sbd->sb_locktable))
   1123 			label = sbd->sb_locktable;
   1124 		blkid_set_tag(probe->dev, "LABEL", label, sizeof(sbd->sb_locktable));
   1125 		return 0;
   1126 	}
   1127 	return 1;
   1128 }
   1129 
   1130 static void unicode_16be_to_utf8(unsigned char *str, int out_len,
   1131 				 const unsigned char *buf, int in_len)
   1132 {
   1133 	int i, j;
   1134 	unsigned int c;
   1135 
   1136 	for (i = j = 0; i + 2 <= in_len; i += 2) {
   1137 		c = (buf[i] << 8) | buf[i+1];
   1138 		if (c == 0) {
   1139 			str[j] = '\0';
   1140 			break;
   1141 		} else if (c < 0x80) {
   1142 			if (j+1 >= out_len)
   1143 				break;
   1144 			str[j++] = (unsigned char) c;
   1145 		} else if (c < 0x800) {
   1146 			if (j+2 >= out_len)
   1147 				break;
   1148 			str[j++] = (unsigned char) (0xc0 | (c >> 6));
   1149 			str[j++] = (unsigned char) (0x80 | (c & 0x3f));
   1150 		} else {
   1151 			if (j+3 >= out_len)
   1152 				break;
   1153 			str[j++] = (unsigned char) (0xe0 | (c >> 12));
   1154 			str[j++] = (unsigned char) (0x80 | ((c >> 6) & 0x3f));
   1155 			str[j++] = (unsigned char) (0x80 | (c & 0x3f));
   1156 		}
   1157 	}
   1158 	str[j] = '\0';
   1159 }
   1160 
   1161 static int probe_hfs(struct blkid_probe *probe __BLKID_ATTR((unused)),
   1162 			 struct blkid_magic *id __BLKID_ATTR((unused)),
   1163 			 unsigned char *buf)
   1164 {
   1165 	struct hfs_mdb *hfs = (struct hfs_mdb *) buf;
   1166 	char	uuid_str[17];
   1167 	__u64	uuid;
   1168 
   1169 	if ((memcmp(hfs->embed_sig, "H+", 2) == 0) ||
   1170 	    (memcmp(hfs->embed_sig, "HX", 2) == 0))
   1171 		return 1;	/* Not hfs, but an embedded HFS+ */
   1172 
   1173 	uuid = blkid_le64(*((unsigned long long *) hfs->finder_info.id));
   1174 	if (uuid) {
   1175 		sprintf(uuid_str, "%016llX", uuid);
   1176 		blkid_set_tag(probe->dev, "UUID", uuid_str, 0);
   1177 	}
   1178 	blkid_set_tag(probe->dev, "LABEL", hfs->label, hfs->label_len);
   1179 	return 0;
   1180 }
   1181 
   1182 
   1183 static int probe_hfsplus(struct blkid_probe *probe,
   1184 			 struct blkid_magic *id,
   1185 			 unsigned char *buf)
   1186 {
   1187 	struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT];
   1188 	struct hfsplus_bnode_descriptor *descr;
   1189 	struct hfsplus_bheader_record *bnode;
   1190 	struct hfsplus_catalog_key *key;
   1191 	struct hfsplus_vol_header *hfsplus;
   1192 	struct hfs_mdb *sbd = (struct hfs_mdb *) buf;
   1193 	unsigned int alloc_block_size;
   1194 	unsigned int alloc_first_block;
   1195 	unsigned int embed_first_block;
   1196 	unsigned int off = 0;
   1197 	unsigned int blocksize;
   1198 	unsigned int cat_block;
   1199 	unsigned int ext_block_start;
   1200 	unsigned int ext_block_count;
   1201 	unsigned int record_count;
   1202 	unsigned int leaf_node_head;
   1203 	unsigned int leaf_node_count;
   1204 	unsigned int leaf_node_size;
   1205 	unsigned int leaf_block;
   1206 	unsigned int label_len;
   1207 	int ext;
   1208 	__u64 leaf_off, uuid;
   1209 	char	uuid_str[17], label[512];
   1210 
   1211 	/* Check for a HFS+ volume embedded in a HFS volume */
   1212 	if (memcmp(sbd->signature, "BD", 2) == 0) {
   1213 		if ((memcmp(sbd->embed_sig, "H+", 2) != 0) &&
   1214 		    (memcmp(sbd->embed_sig, "HX", 2) != 0))
   1215 			/* This must be an HFS volume, so fail */
   1216 			return 1;
   1217 
   1218 		alloc_block_size = blkid_be32(sbd->al_blk_size);
   1219 		alloc_first_block = blkid_be16(sbd->al_bl_st);
   1220 		embed_first_block = blkid_be16(sbd->embed_startblock);
   1221 		off = (alloc_first_block * 512) +
   1222 			(embed_first_block * alloc_block_size);
   1223 		buf = get_buffer(probe, off + (id->bim_kboff * 1024),
   1224 				 sizeof(sbd));
   1225 		if (!buf)
   1226 			return 1;
   1227 
   1228 		hfsplus = (struct hfsplus_vol_header *) buf;
   1229 	}
   1230 
   1231 	hfsplus = (struct hfsplus_vol_header *) buf;
   1232 
   1233 	if ((memcmp(hfsplus->signature, "H+", 2) != 0) &&
   1234 	    (memcmp(hfsplus->signature, "HX", 2) != 0))
   1235 		return 1;
   1236 
   1237 	uuid = blkid_le64(*((unsigned long long *) hfsplus->finder_info.id));
   1238 	if (uuid) {
   1239 		sprintf(uuid_str, "%016llX", uuid);
   1240 		blkid_set_tag(probe->dev, "UUID", uuid_str, 0);
   1241 	}
   1242 
   1243 	blocksize = blkid_be32(hfsplus->blocksize);
   1244 	memcpy(extents, hfsplus->cat_file.extents, sizeof(extents));
   1245 	cat_block = blkid_be32(extents[0].start_block);
   1246 
   1247 	buf = get_buffer(probe, off + (cat_block * blocksize), 0x2000);
   1248 	if (!buf)
   1249 		return 0;
   1250 
   1251 	bnode = (struct hfsplus_bheader_record *)
   1252 		&buf[sizeof(struct hfsplus_bnode_descriptor)];
   1253 
   1254 	leaf_node_head = blkid_be32(bnode->leaf_head);
   1255 	leaf_node_size = blkid_be16(bnode->node_size);
   1256 	leaf_node_count = blkid_be32(bnode->leaf_count);
   1257 	if (leaf_node_count == 0)
   1258 		return 0;
   1259 
   1260 	leaf_block = (leaf_node_head * leaf_node_size) / blocksize;
   1261 
   1262 	/* get physical location */
   1263 	for (ext = 0; ext < HFSPLUS_EXTENT_COUNT; ext++) {
   1264 		ext_block_start = blkid_be32(extents[ext].start_block);
   1265 		ext_block_count = blkid_be32(extents[ext].block_count);
   1266 		if (ext_block_count == 0)
   1267 			return 0;
   1268 
   1269 		/* this is our extent */
   1270 		if (leaf_block < ext_block_count)
   1271 			break;
   1272 
   1273 		leaf_block -= ext_block_count;
   1274 	}
   1275 	if (ext == HFSPLUS_EXTENT_COUNT)
   1276 		return 0;
   1277 
   1278 	leaf_off = (ext_block_start + leaf_block) * blocksize;
   1279 
   1280 	buf = get_buffer(probe, off + leaf_off, leaf_node_size);
   1281 	if (!buf)
   1282 		return 0;
   1283 
   1284 	descr = (struct hfsplus_bnode_descriptor *) buf;
   1285 	record_count = blkid_be16(descr->num_recs);
   1286 	if (record_count == 0)
   1287 		return 0;
   1288 
   1289 	if (descr->type != HFS_NODE_LEAF)
   1290 		return 0;
   1291 
   1292 	key = (struct hfsplus_catalog_key *)
   1293 		&buf[sizeof(struct hfsplus_bnode_descriptor)];
   1294 
   1295 	if (blkid_be32(key->parent_id) != HFSPLUS_POR_CNID)
   1296 		return 0;
   1297 
   1298 	label_len = blkid_be16(key->unicode_len) * 2;
   1299 	unicode_16be_to_utf8(label, sizeof(label), key->unicode, label_len);
   1300 	blkid_set_tag(probe->dev, "LABEL", label, 0);
   1301 	return 0;
   1302 }
   1303 
   1304 #define LVM2_LABEL_SIZE 512
   1305 static unsigned int lvm2_calc_crc(const void *buf, unsigned int size)
   1306 {
   1307 	static const unsigned int crctab[] = {
   1308 		0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
   1309 		0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
   1310 		0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
   1311 		0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
   1312 	};
   1313 	unsigned int i, crc = 0xf597a6cf;
   1314 	const __u8 *data = (const __u8 *) buf;
   1315 
   1316 	for (i = 0; i < size; i++) {
   1317 		crc ^= *data++;
   1318 		crc = (crc >> 4) ^ crctab[crc & 0xf];
   1319 		crc = (crc >> 4) ^ crctab[crc & 0xf];
   1320 	}
   1321 	return crc;
   1322 }
   1323 
   1324 static int probe_lvm2(struct blkid_probe *probe,
   1325 			struct blkid_magic *id,
   1326 			unsigned char *buf)
   1327 {
   1328 	int sector = (id->bim_kboff) << 1;
   1329 	struct lvm2_pv_label_header *label= (struct lvm2_pv_label_header *)buf;
   1330 	char *p, *q, uuid[40];
   1331 	unsigned int i, b;
   1332 
   1333 	/* buf is at 0k or 1k offset; find label inside */
   1334 	if (memcmp(buf, "LABELONE", 8) == 0) {
   1335 		label = (struct lvm2_pv_label_header *)buf;
   1336 	} else if (memcmp(buf + 512, "LABELONE", 8) == 0) {
   1337 		label = (struct lvm2_pv_label_header *)(buf + 512);
   1338 		sector++;
   1339 	} else {
   1340 		return 1;
   1341 	}
   1342 
   1343 	if (blkid_le64(label->sector_xl) != (unsigned) sector) {
   1344 		DBG(DEBUG_PROBE,
   1345 		    printf("LVM2: label for sector %llu found at sector %d\n",
   1346 			   blkid_le64(label->sector_xl), sector));
   1347 		return 1;
   1348 	}
   1349 
   1350 	if (lvm2_calc_crc(&label->offset_xl, LVM2_LABEL_SIZE -
   1351 			  ((char *)&label->offset_xl - (char *)label)) !=
   1352 			blkid_le32(label->crc_xl)) {
   1353 		DBG(DEBUG_PROBE,
   1354 		    printf("LVM2: label checksum incorrect at sector %d\n",
   1355 			   sector));
   1356 		return 1;
   1357 	}
   1358 
   1359 	for (i=0, b=1, p=uuid, q= (char *) label->pv_uuid; i <= 32;
   1360 	     i++, b <<= 1) {
   1361 		if (b & 0x4444440)
   1362 			*p++ = '-';
   1363 		*p++ = *q++;
   1364 	}
   1365 
   1366 	blkid_set_tag(probe->dev, "UUID", uuid, LVM2_ID_LEN+6);
   1367 
   1368 	return 0;
   1369 }
   1370 
   1371 static int probe_btrfs(struct blkid_probe *probe,
   1372 			struct blkid_magic *id,
   1373 			unsigned char *buf)
   1374 {
   1375 	struct btrfs_super_block *bs;
   1376 	const char *label = 0;
   1377 
   1378 	bs = (struct btrfs_super_block *)buf;
   1379 
   1380 	if (strlen(bs->label))
   1381 		label = bs->label;
   1382 	blkid_set_tag(probe->dev, "LABEL", label, sizeof(bs->label));
   1383 	set_uuid(probe->dev, bs->fsid, 0);
   1384 	return 0;
   1385 }
   1386 /*
   1387  * Various filesystem magics that we can check for.  Note that kboff and
   1388  * sboff are in kilobytes and bytes respectively.  All magics are in
   1389  * byte strings so we don't worry about endian issues.
   1390  */
   1391 static struct blkid_magic type_array[] = {
   1392 /*  type     kboff   sboff len  magic			probe */
   1393   { "oracleasm", 0,	32,  8, "ORCLDISK",		probe_oracleasm },
   1394   { "ntfs",	 0,	 3,  8, "NTFS    ",		probe_ntfs },
   1395   { "jbd",	 1,   0x38,  2, "\123\357",		probe_jbd },
   1396   { "ext4dev",	 1,   0x38,  2, "\123\357",		probe_ext4dev },
   1397   { "ext4",	 1,   0x38,  2, "\123\357",		probe_ext4 },
   1398   { "ext3",	 1,   0x38,  2, "\123\357",		probe_ext3 },
   1399   { "ext2",	 1,   0x38,  2, "\123\357",		probe_ext2 },
   1400   { "reiserfs",	 8,   0x34,  8, "ReIsErFs",		probe_reiserfs },
   1401   { "reiserfs", 64,   0x34,  9, "ReIsEr2Fs",		probe_reiserfs },
   1402   { "reiserfs", 64,   0x34,  9, "ReIsEr3Fs",		probe_reiserfs },
   1403   { "reiserfs", 64,   0x34,  8, "ReIsErFs",		probe_reiserfs },
   1404   { "reiserfs",	 8,	20,  8, "ReIsErFs",		probe_reiserfs },
   1405   { "reiser4",  64,	 0,  7, "ReIsEr4",		probe_reiserfs4 },
   1406   { "gfs2",     64,      0,  4, "\x01\x16\x19\x70",     probe_gfs2 },
   1407   { "gfs",      64,      0,  4, "\x01\x16\x19\x70",     probe_gfs },
   1408   { "vfat",      0,   0x52,  5, "MSWIN",                probe_fat },
   1409   { "vfat",      0,   0x52,  8, "FAT32   ",             probe_fat },
   1410   { "vfat",      0,   0x36,  5, "MSDOS",                probe_fat },
   1411   { "vfat",      0,   0x36,  8, "FAT16   ",             probe_fat },
   1412   { "vfat",      0,   0x36,  8, "FAT12   ",             probe_fat },
   1413   { "vfat",      0,      0,  1, "\353",                 probe_fat_nomagic },
   1414   { "vfat",      0,      0,  1, "\351",                 probe_fat_nomagic },
   1415   { "vfat",      0,  0x1fe,  2, "\125\252",             probe_fat_nomagic },
   1416   { "minix",     1,   0x10,  2, "\177\023",             0 },
   1417   { "minix",     1,   0x10,  2, "\217\023",             0 },
   1418   { "minix",	 1,   0x10,  2, "\150\044",		0 },
   1419   { "minix",	 1,   0x10,  2, "\170\044",		0 },
   1420   { "vxfs",	 1,	 0,  4, "\365\374\001\245",	0 },
   1421   { "xfs",	 0,	 0,  4, "XFSB",			probe_xfs },
   1422   { "romfs",	 0,	 0,  8, "-rom1fs-",		probe_romfs },
   1423   { "bfs",	 0,	 0,  4, "\316\372\173\033",	0 },
   1424   { "cramfs",	 0,	 0,  4, "E=\315\050",		probe_cramfs },
   1425   { "qnx4",	 0,	 4,  6, "QNX4FS",		0 },
   1426   { "udf",	32,	 1,  5, "BEA01",		probe_udf },
   1427   { "udf",	32,	 1,  5, "BOOT2",		probe_udf },
   1428   { "udf",	32,	 1,  5, "CD001",		probe_udf },
   1429   { "udf",	32,	 1,  5, "CDW02",		probe_udf },
   1430   { "udf",	32,	 1,  5, "NSR02",		probe_udf },
   1431   { "udf",	32,	 1,  5, "NSR03",		probe_udf },
   1432   { "udf",	32,	 1,  5, "TEA01",		probe_udf },
   1433   { "iso9660",	32,	 1,  5, "CD001",		probe_iso9660 },
   1434   { "iso9660",	32,	 9,  5, "CDROM",		probe_iso9660 },
   1435   { "jfs",	32,	 0,  4, "JFS1",			probe_jfs },
   1436   { "zfs",       8,	 0,  8, "\0\0\x02\xf5\xb0\x07\xb1\x0c", probe_zfs },
   1437   { "zfs",       8,	 0,  8, "\x0c\xb1\x07\xb0\xf5\x02\0\0", probe_zfs },
   1438   { "zfs",     264,	 0,  8, "\0\0\x02\xf5\xb0\x07\xb1\x0c", probe_zfs },
   1439   { "zfs",     264,	 0,  8, "\x0c\xb1\x07\xb0\xf5\x02\0\0", probe_zfs },
   1440   { "hfsplus",	 1,	 0,  2, "BD",			probe_hfsplus },
   1441   { "hfsplus",	 1,	 0,  2, "H+",			probe_hfsplus },
   1442   { "hfsplus",	 1,	 0,  2, "HX",			probe_hfsplus },
   1443   { "hfs",	 1,	 0,  2, "BD",			probe_hfs },
   1444   { "ufs",	 8,  0x55c,  4, "T\031\001\000",	0 },
   1445   { "hpfs",	 8,	 0,  4, "I\350\225\371",	0 },
   1446   { "sysv",	 0,  0x3f8,  4, "\020~\030\375",	0 },
   1447   { "swap",	 0,  0xff6, 10, "SWAP-SPACE",		probe_swap0 },
   1448   { "swap",	 0,  0xff6, 10, "SWAPSPACE2",		probe_swap1 },
   1449   { "swsuspend", 0,  0xff6,  9, "S1SUSPEND",		probe_swap1 },
   1450   { "swsuspend", 0,  0xff6,  9, "S2SUSPEND",		probe_swap1 },
   1451   { "swsuspend", 0,  0xff6,  9, "ULSUSPEND",		probe_swap1 },
   1452   { "swap",	 0, 0x1ff6, 10, "SWAP-SPACE",		probe_swap0 },
   1453   { "swap",	 0, 0x1ff6, 10, "SWAPSPACE2",		probe_swap1 },
   1454   { "swsuspend", 0, 0x1ff6,  9, "S1SUSPEND",		probe_swap1 },
   1455   { "swsuspend", 0, 0x1ff6,  9, "S2SUSPEND",		probe_swap1 },
   1456   { "swsuspend", 0, 0x1ff6,  9, "ULSUSPEND",		probe_swap1 },
   1457   { "swap",	 0, 0x3ff6, 10, "SWAP-SPACE",		probe_swap0 },
   1458   { "swap",	 0, 0x3ff6, 10, "SWAPSPACE2",		probe_swap1 },
   1459   { "swsuspend", 0, 0x3ff6,  9, "S1SUSPEND",		probe_swap1 },
   1460   { "swsuspend", 0, 0x3ff6,  9, "S2SUSPEND",		probe_swap1 },
   1461   { "swsuspend", 0, 0x3ff6,  9, "ULSUSPEND",		probe_swap1 },
   1462   { "swap",	 0, 0x7ff6, 10, "SWAP-SPACE",		probe_swap0 },
   1463   { "swap",	 0, 0x7ff6, 10, "SWAPSPACE2",		probe_swap1 },
   1464   { "swsuspend", 0, 0x7ff6,  9, "S1SUSPEND",		probe_swap1 },
   1465   { "swsuspend", 0, 0x7ff6,  9, "S2SUSPEND",		probe_swap1 },
   1466   { "swsuspend", 0, 0x7ff6,  9, "ULSUSPEND",		probe_swap1 },
   1467   { "swap",	 0, 0xfff6, 10, "SWAP-SPACE",		probe_swap0 },
   1468   { "swap",	 0, 0xfff6, 10, "SWAPSPACE2",		probe_swap1 },
   1469   { "swsuspend", 0, 0xfff6,  9, "S1SUSPEND",		probe_swap1 },
   1470   { "swsuspend", 0, 0xfff6,  9, "S2SUSPEND",		probe_swap1 },
   1471   { "swsuspend", 0, 0xfff6,  9, "ULSUSPEND",		probe_swap1 },
   1472   { "ocfs",	 0,	 8,  9,	"OracleCFS",		probe_ocfs },
   1473   { "ocfs2",	 1,	 0,  6,	"OCFSV2",		probe_ocfs2 },
   1474   { "ocfs2",	 2,	 0,  6,	"OCFSV2",		probe_ocfs2 },
   1475   { "ocfs2",	 4,	 0,  6,	"OCFSV2",		probe_ocfs2 },
   1476   { "ocfs2",	 8,	 0,  6,	"OCFSV2",		probe_ocfs2 },
   1477   { "crypt_LUKS", 0,	 0,  6,	"LUKS\xba\xbe",		probe_luks },
   1478   { "squashfs",	 0,	 0,  4,	"sqsh",			0 },
   1479   { "squashfs",	 0,	 0,  4,	"hsqs",			0 },
   1480   { "lvm2pv",	 0,  0x218,  8, "LVM2 001",		probe_lvm2 },
   1481   { "lvm2pv",	 0,  0x018,  8, "LVM2 001",		probe_lvm2 },
   1482   { "lvm2pv",	 1,  0x018,  8, "LVM2 001",		probe_lvm2 },
   1483   { "lvm2pv",	 1,  0x218,  8, "LVM2 001",		probe_lvm2 },
   1484   { "btrfs",	 64,  0x40,  8, "_BHRfS_M",		probe_btrfs },
   1485   {   NULL,	 0,	 0,  0, NULL,			NULL }
   1486 };
   1487 
   1488 /*
   1489  * Verify that the data in dev is consistent with what is on the actual
   1490  * block device (using the devname field only).  Normally this will be
   1491  * called when finding items in the cache, but for long running processes
   1492  * is also desirable to revalidate an item before use.
   1493  *
   1494  * If we are unable to revalidate the data, we return the old data and
   1495  * do not set the BLKID_BID_FL_VERIFIED flag on it.
   1496  */
   1497 blkid_dev blkid_verify(blkid_cache cache, blkid_dev dev)
   1498 {
   1499 	struct blkid_magic *id;
   1500 	struct blkid_probe probe;
   1501 	blkid_tag_iterate iter;
   1502 	unsigned char *buf;
   1503 	const char *type, *value;
   1504 	struct stat st;
   1505 	time_t now;
   1506 	double diff;
   1507 	int idx;
   1508 
   1509 	if (!dev)
   1510 		return NULL;
   1511 
   1512 	now = time(0);
   1513 	diff = difftime(now, dev->bid_time);
   1514 
   1515 	if (stat(dev->bid_name, &st) < 0) {
   1516 		DBG(DEBUG_PROBE,
   1517 		    printf("blkid_verify: error %s (%d) while "
   1518 			   "trying to stat %s\n", strerror(errno), errno,
   1519 			   dev->bid_name));
   1520 	open_err:
   1521 		if ((errno == EPERM) || (errno == EACCES) || (errno == ENOENT)) {
   1522 			/* We don't have read permission, just return cache data. */
   1523 			DBG(DEBUG_PROBE, printf("returning unverified data for %s\n",
   1524 						dev->bid_name));
   1525 			return dev;
   1526 		}
   1527 		blkid_free_dev(dev);
   1528 		return NULL;
   1529 	}
   1530 
   1531 	if ((now >= dev->bid_time) &&
   1532 	    (st.st_mtime <= dev->bid_time) &&
   1533 	    ((diff < BLKID_PROBE_MIN) ||
   1534 	     (dev->bid_flags & BLKID_BID_FL_VERIFIED &&
   1535 	      diff < BLKID_PROBE_INTERVAL)))
   1536 		return dev;
   1537 
   1538 	DBG(DEBUG_PROBE,
   1539 	    printf("need to revalidate %s (cache time %lu, stat time %lu,\n\t"
   1540 		   "time since last check %lu)\n",
   1541 		   dev->bid_name, (unsigned long)dev->bid_time,
   1542 		   (unsigned long)st.st_mtime, (unsigned long)diff));
   1543 
   1544 	if ((probe.fd = open(dev->bid_name, O_RDONLY)) < 0) {
   1545 		DBG(DEBUG_PROBE, printf("blkid_verify: error %s (%d) while "
   1546 					"opening %s\n", strerror(errno), errno,
   1547 					dev->bid_name));
   1548 		goto open_err;
   1549 	}
   1550 
   1551 	probe.cache = cache;
   1552 	probe.dev = dev;
   1553 	probe.sbbuf = 0;
   1554 	probe.buf = 0;
   1555 	probe.buf_max = 0;
   1556 
   1557 	/*
   1558 	 * Iterate over the type array.  If we already know the type,
   1559 	 * then try that first.  If it doesn't work, then blow away
   1560 	 * the type information, and try again.
   1561 	 *
   1562 	 */
   1563 try_again:
   1564 	type = 0;
   1565 	if (!dev->bid_type || !strcmp(dev->bid_type, "mdraid")) {
   1566 		uuid_t	uuid;
   1567 
   1568 		if (check_mdraid(probe.fd, uuid) == 0) {
   1569 			set_uuid(dev, uuid, 0);
   1570 			type = "mdraid";
   1571 			goto found_type;
   1572 		}
   1573 	}
   1574 	for (id = type_array; id->bim_type; id++) {
   1575 		if (dev->bid_type &&
   1576 		    strcmp(id->bim_type, dev->bid_type))
   1577 			continue;
   1578 
   1579 		idx = id->bim_kboff + (id->bim_sboff >> 10);
   1580 		buf = get_buffer(&probe, idx << 10, 1024);
   1581 		if (!buf)
   1582 			continue;
   1583 
   1584 		if (memcmp(id->bim_magic, buf + (id->bim_sboff & 0x3ff),
   1585 			   id->bim_len))
   1586 			continue;
   1587 
   1588 		if ((id->bim_probe == NULL) ||
   1589 		    (id->bim_probe(&probe, id, buf) == 0)) {
   1590 			type = id->bim_type;
   1591 			goto found_type;
   1592 		}
   1593 	}
   1594 
   1595 	if (!id->bim_type && dev->bid_type) {
   1596 		/*
   1597 		 * Zap the device filesystem information and try again
   1598 		 */
   1599 		DBG(DEBUG_PROBE,
   1600 		    printf("previous fs type %s not valid, "
   1601 			   "trying full probe\n", dev->bid_type));
   1602 		iter = blkid_tag_iterate_begin(dev);
   1603 		while (blkid_tag_next(iter, &type, &value) == 0)
   1604 			blkid_set_tag(dev, type, 0, 0);
   1605 		blkid_tag_iterate_end(iter);
   1606 		goto try_again;
   1607 	}
   1608 
   1609 	if (!dev->bid_type) {
   1610 		blkid_free_dev(dev);
   1611 		dev = 0;
   1612 		goto found_type;
   1613 	}
   1614 
   1615 found_type:
   1616 	if (dev && type) {
   1617 		dev->bid_devno = st.st_rdev;
   1618 		dev->bid_time = time(0);
   1619 		dev->bid_flags |= BLKID_BID_FL_VERIFIED;
   1620 		cache->bic_flags |= BLKID_BIC_FL_CHANGED;
   1621 
   1622 		blkid_set_tag(dev, "TYPE", type, 0);
   1623 
   1624 		DBG(DEBUG_PROBE, printf("%s: devno 0x%04llx, type %s\n",
   1625 			   dev->bid_name, (long long)st.st_rdev, type));
   1626 	}
   1627 
   1628 	free(probe.sbbuf);
   1629 	free(probe.buf);
   1630 	if (probe.fd >= 0)
   1631 		close(probe.fd);
   1632 
   1633 	return dev;
   1634 }
   1635 
   1636 int blkid_known_fstype(const char *fstype)
   1637 {
   1638 	struct blkid_magic *id;
   1639 
   1640 	for (id = type_array; id->bim_type; id++) {
   1641 		if (strcmp(fstype, id->bim_type) == 0)
   1642 			return 1;
   1643 	}
   1644 	return 0;
   1645 }
   1646 
   1647 #ifdef TEST_PROGRAM
   1648 int main(int argc, char **argv)
   1649 {
   1650 	blkid_dev dev;
   1651 	blkid_cache cache;
   1652 	int ret;
   1653 
   1654 	if (argc != 2) {
   1655 		fprintf(stderr, "Usage: %s device\n"
   1656 			"Probe a single device to determine type\n", argv[0]);
   1657 		exit(1);
   1658 	}
   1659 	if ((ret = blkid_get_cache(&cache, "/dev/null")) != 0) {
   1660 		fprintf(stderr, "%s: error creating cache (%d)\n",
   1661 			argv[0], ret);
   1662 		exit(1);
   1663 	}
   1664 	dev = blkid_get_dev(cache, argv[1], BLKID_DEV_NORMAL);
   1665 	if (!dev) {
   1666 		printf("%s: %s has an unsupported type\n", argv[0], argv[1]);
   1667 		return (1);
   1668 	}
   1669 	printf("TYPE='%s'\n", dev->bid_type ? dev->bid_type : "(null)");
   1670 	if (dev->bid_label)
   1671 		printf("LABEL='%s'\n", dev->bid_label);
   1672 	if (dev->bid_uuid)
   1673 		printf("UUID='%s'\n", dev->bid_uuid);
   1674 
   1675 	blkid_free_dev(dev);
   1676 	return (0);
   1677 }
   1678 #endif
   1679