Adding upstream version 1.47.0.upstream/1.47.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1841 insertions, 0 deletions

diff --git a/lib/blkid/probe.c b/lib/blkid/probe.c
new file mode 100644
index 0000000..6a3bb24
--- /dev/null
+++ b/lib/blkid/probe.c
@@ -0,0 +1,1841 @@
+/*
+ * probe.c - identify a block device by its contents, and return a dev
+ *           struct with the details
+ *
+ * Copyright (C) 1999 by Andries Brouwer
+ * Copyright (C) 1999, 2000, 2003 by Theodore Ts'o
+ * Copyright (C) 2001 by Andreas Dilger
+ * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ * %End-Header%
+ */
+
+#include "config.h"
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <time.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <ctype.h>
+#include <sys/types.h>
+#ifdef HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+#ifdef HAVE_SYS_MKDEV_H
+#include <sys/mkdev.h>
+#endif
+#ifdef __linux__
+#include <sys/utsname.h>
+#endif
+#ifdef HAVE_ERRNO_H
+#include <errno.h>
+#endif
+#include "blkidP.h"
+#include "uuid/uuid.h"
+#include "probe.h"
+
+static int figure_label_len(const unsigned char *label, int len)
+{
+	const unsigned char *end = label + len - 1;
+
+	while (end >= label && (*end == ' ' || *end == 0))
+		--end;
+	if (end >= label)
+		return end - label + 1;
+	return 0;
+}
+
+static unsigned char *get_buffer(struct blkid_probe *pr,
+			  blkid_loff_t off, size_t len)
+{
+	ssize_t		ret_read;
+	unsigned char	*newbuf;
+
+	if (off + len <= SB_BUFFER_SIZE) {
+		if (!pr->sbbuf) {
+			pr->sbbuf = malloc(SB_BUFFER_SIZE);
+			if (!pr->sbbuf)
+				return NULL;
+			if (lseek(pr->fd, 0, SEEK_SET) < 0)
+				return NULL;
+			ret_read = read(pr->fd, pr->sbbuf, SB_BUFFER_SIZE);
+			if (ret_read < 0)
+				ret_read = 0;
+			pr->sb_valid = ret_read;
+		}
+		if (off+len > pr->sb_valid)
+			return NULL;
+		return pr->sbbuf + off;
+	} else {
+		if (len > pr->buf_max) {
+			newbuf = realloc(pr->buf, len);
+			if (newbuf == NULL)
+				return NULL;
+			pr->buf = newbuf;
+			pr->buf_max = len;
+		}
+		if (blkid_llseek(pr->fd, off, SEEK_SET) < 0)
+			return NULL;
+		ret_read = read(pr->fd, pr->buf, len);
+		if (ret_read != (ssize_t) len)
+			return NULL;
+		return pr->buf;
+	}
+}
+
+
+/*
+ * This is a special case code to check for an MDRAID device.  We do
+ * this special since it requires checking for a superblock at the end
+ * of the device.
+ */
+static int check_mdraid(int fd, unsigned char *ret_uuid)
+{
+	struct mdp_superblock_s *md;
+	blkid_loff_t		offset;
+	char			buf[4096];
+
+	if (fd < 0)
+		return -BLKID_ERR_PARAM;
+
+	offset = (blkid_get_dev_size(fd) & ~((blkid_loff_t)65535)) - 65536;
+
+	if (blkid_llseek(fd, offset, 0) < 0 ||
+	    read(fd, buf, 4096) != 4096)
+		return -BLKID_ERR_IO;
+	/* Check for magic number */
+	if (memcmp("\251+N\374", buf, 4) && memcmp("\374N+\251", buf, 4))
+		return -BLKID_ERR_PARAM;
+
+	if (!ret_uuid)
+		return 0;
+	*ret_uuid = 0;
+
+	/* The MD UUID is not contiguous in the superblock, make it so */
+	md = (struct mdp_superblock_s *)buf;
+	if (md->set_uuid0 || md->set_uuid1 || md->set_uuid2 || md->set_uuid3) {
+		memcpy(ret_uuid, &md->set_uuid0, 4);
+		memcpy(ret_uuid + 4, &md->set_uuid1, 12);
+	}
+	return 0;
+}
+
+static void set_uuid(blkid_dev dev, uuid_t uuid, const char *tag)
+{
+	char	str[37];
+
+	if (!uuid_is_null(uuid)) {
+		uuid_unparse(uuid, str);
+		blkid_set_tag(dev, tag ? tag : "UUID", str, sizeof(str));
+	}
+}
+
+static void get_ext2_info(blkid_dev dev, struct blkid_magic *id,
+			  unsigned char *buf)
+{
+	struct ext2_super_block *es = (struct ext2_super_block *) buf;
+	const char *label = 0;
+
+	DBG(DEBUG_PROBE, printf("ext2_sb.compat = %08X:%08X:%08X\n",
+		   blkid_le32(es->s_feature_compat),
+		   blkid_le32(es->s_feature_incompat),
+		   blkid_le32(es->s_feature_ro_compat)));
+
+	if (es->s_volume_name[0])
+		label = es->s_volume_name;
+	blkid_set_tag(dev, "LABEL", label, sizeof(es->s_volume_name));
+
+	set_uuid(dev, es->s_uuid, 0);
+
+	if ((es->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
+	    !uuid_is_null(es->s_journal_uuid))
+		set_uuid(dev, es->s_journal_uuid, "EXT_JOURNAL");
+
+	if (strcmp(id->bim_type, "ext2") &&
+	    ((blkid_le32(es->s_feature_incompat) &
+	      EXT2_FEATURE_INCOMPAT_UNSUPPORTED) == 0))
+		blkid_set_tag(dev, "SEC_TYPE", "ext2", sizeof("ext2"));
+}
+
+/*
+ * Check to see if a filesystem is in /proc/filesystems.
+ * Returns 1 if found, 0 if not
+ */
+static int fs_proc_check(const char *fs_name)
+{
+	FILE	*f;
+	char	buf[80], *cp, *t;
+
+	f = fopen("/proc/filesystems", "r");
+	if (!f)
+		return (0);
+	while (!feof(f)) {
+		if (!fgets(buf, sizeof(buf), f))
+			break;
+		cp = buf;
+		if (!isspace(*cp)) {
+			while (*cp && !isspace(*cp))
+				cp++;
+		}
+		while (*cp && isspace(*cp))
+			cp++;
+		if ((t = strchr(cp, '\n')) != NULL)
+			*t = 0;
+		if ((t = strchr(cp, '\t')) != NULL)
+			*t = 0;
+		if ((t = strchr(cp, ' ')) != NULL)
+			*t = 0;
+		if (!strcmp(fs_name, cp)) {
+			fclose(f);
+			return (1);
+		}
+	}
+	fclose(f);
+	return (0);
+}
+
+/*
+ * Check to see if a filesystem is available as a module
+ * Returns 1 if found, 0 if not
+ */
+static int check_for_modules(const char *fs_name)
+{
+#ifdef __linux__
+	struct utsname	uts;
+	FILE		*f;
+	char		buf[1024], *cp;
+	int		namesz;
+
+	if (uname(&uts))
+		return (0);
+	snprintf(buf, sizeof(buf), "/lib/modules/%s/modules.dep", uts.release);
+
+	f = fopen(buf, "r");
+	if (!f)
+		return (0);
+
+	namesz = strlen(fs_name);
+
+	while (!feof(f)) {
+		if (!fgets(buf, sizeof(buf), f))
+			break;
+		if ((cp = strchr(buf, ':')) != NULL)
+			*cp = 0;
+		else
+			continue;
+		if ((cp = strrchr(buf, '/')) != NULL)
+			cp++;
+		else
+			cp = buf;
+		if (!strncmp(cp, fs_name, namesz) &&
+		    (!strcmp(cp + namesz, ".ko") ||
+		     !strcmp(cp + namesz, ".ko.gz"))) {
+			fclose(f);
+			return (1);
+		}
+	}
+	fclose(f);
+#endif
+	return (0);
+}
+
+static int linux_version_code(void)
+{
+#ifdef __linux__
+	struct utsname	ut;
+	static int	version_code = -1;
+	int		major, minor, rev;
+	char		*endptr;
+	const char 	*cp;
+
+	if (version_code > 0)
+		return version_code;
+
+	if (uname(&ut))
+		return 0;
+	cp = ut.release;
+
+	major = strtol(cp, &endptr, 10);
+	if (cp == endptr || *endptr != '.')
+		return 0;
+	cp = endptr + 1;
+	minor = strtol(cp, &endptr, 10);
+	if (cp == endptr || *endptr != '.')
+		return 0;
+	cp = endptr + 1;
+	rev = strtol(cp, &endptr, 10);
+	if (cp == endptr)
+		return 0;
+	version_code = (((major * 256) + minor) * 256) + rev;
+	return version_code;
+#else
+	return 0;
+#endif
+}
+
+#define EXT4_SUPPORTS_EXT2 (2 * 65536 + 6*256 + 29)
+
+static int system_supports_ext2(void)
+{
+	static time_t	last_check = 0;
+	static int	ret = -1;
+	time_t		now = time(0);
+
+	if (ret != -1 || (now - last_check) < 5)
+		return ret;
+	last_check = now;
+	ret = (fs_proc_check("ext2") || check_for_modules("ext2"));
+	return ret;
+}
+
+static int system_supports_ext4(void)
+{
+	static time_t	last_check = 0;
+	static int	ret = -1;
+	time_t		now = time(0);
+
+	if (ret != -1 || (now - last_check) < 5)
+		return ret;
+	last_check = now;
+	ret = (fs_proc_check("ext4") || check_for_modules("ext4"));
+	return ret;
+}
+
+static int system_supports_ext4dev(void)
+{
+	static time_t	last_check = 0;
+	static int	ret = -1;
+	time_t		now = time(0);
+
+	if (ret != -1 || (now - last_check) < 5)
+		return ret;
+	last_check = now;
+	ret = (fs_proc_check("ext4dev") || check_for_modules("ext4dev"));
+	return ret;
+}
+
+static int probe_ext4dev(struct blkid_probe *probe,
+			 struct blkid_magic *id,
+			 unsigned char *buf)
+{
+	struct ext2_super_block *es;
+	es = (struct ext2_super_block *)buf;
+
+	/* Distinguish from jbd */
+	if (blkid_le32(es->s_feature_incompat) &
+	    EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)
+		return -BLKID_ERR_PARAM;
+
+	/*
+	 * If the filesystem does not have a journal and ext2 and ext4
+	 * is not present, then force this to be detected as an
+	 * ext4dev filesystem.
+	 */
+	if (!(blkid_le32(es->s_feature_compat) &
+	      EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
+	    !system_supports_ext2() && !system_supports_ext4() &&
+	    system_supports_ext4dev() &&
+	    linux_version_code() >= EXT4_SUPPORTS_EXT2)
+		goto force_ext4dev;
+
+	/*
+	 * If the filesystem is marked as OK for use by in-development
+	 * filesystem code, but ext4dev is not supported, and ext4 is,
+	 * then don't call ourselves ext4dev, since we should be
+	 * detected as ext4 in that case.
+	 *
+	 * If the filesystem is marked as in use by production
+	 * filesystem, then it can only be used by ext4 and NOT by
+	 * ext4dev, so always disclaim we are ext4dev in that case.
+	 */
+	if (blkid_le32(es->s_flags) & EXT2_FLAGS_TEST_FILESYS) {
+		if (!system_supports_ext4dev() && system_supports_ext4())
+			return -BLKID_ERR_PARAM;
+	} else
+		return -BLKID_ERR_PARAM;
+
+force_ext4dev:
+    	get_ext2_info(probe->dev, id, buf);
+	return 0;
+}
+
+static int probe_ext4(struct blkid_probe *probe, struct blkid_magic *id,
+		      unsigned char *buf)
+{
+	struct ext2_super_block *es;
+	es = (struct ext2_super_block *)buf;
+
+	/* Distinguish from jbd */
+	if (blkid_le32(es->s_feature_incompat) &
+	    EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)
+		return -BLKID_ERR_PARAM;
+
+	/*
+	 * If the filesystem does not have a journal and ext2 is not
+	 * present, then force this to be detected as an ext2
+	 * filesystem.
+	 */
+	if (!(blkid_le32(es->s_feature_compat) &
+	      EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
+	    !system_supports_ext2() && system_supports_ext4() &&
+	    linux_version_code() >= EXT4_SUPPORTS_EXT2)
+		goto force_ext4;
+
+	/* Ext4 has at least one feature which ext3 doesn't understand */
+	if (!(blkid_le32(es->s_feature_ro_compat) &
+	      EXT3_FEATURE_RO_COMPAT_UNSUPPORTED) &&
+	    !(blkid_le32(es->s_feature_incompat) &
+	      EXT3_FEATURE_INCOMPAT_UNSUPPORTED))
+		return -BLKID_ERR_PARAM;
+
+force_ext4:
+	/*
+	 * If the filesystem is a OK for use by in-development
+	 * filesystem code, and ext4dev is supported or ext4 is not
+	 * supported, then don't call ourselves ext4, so we can redo
+	 * the detection and mark the filesystem as ext4dev.
+	 *
+	 * If the filesystem is marked as in use by production
+	 * filesystem, then it can only be used by ext4 and NOT by
+	 * ext4dev.
+	 */
+	if (blkid_le32(es->s_flags) & EXT2_FLAGS_TEST_FILESYS) {
+		if (system_supports_ext4dev() || !system_supports_ext4())
+			return -BLKID_ERR_PARAM;
+	}
+    	get_ext2_info(probe->dev, id, buf);
+	return 0;
+}
+
+static int probe_ext3(struct blkid_probe *probe, struct blkid_magic *id,
+		      unsigned char *buf)
+{
+	struct ext2_super_block *es;
+	es = (struct ext2_super_block *)buf;
+
+	/* ext3 requires journal */
+	if (!(blkid_le32(es->s_feature_compat) &
+	      EXT3_FEATURE_COMPAT_HAS_JOURNAL))
+		return -BLKID_ERR_PARAM;
+
+	/* Any features which ext3 doesn't understand */
+	if ((blkid_le32(es->s_feature_ro_compat) &
+	     EXT3_FEATURE_RO_COMPAT_UNSUPPORTED) ||
+	    (blkid_le32(es->s_feature_incompat) &
+	     EXT3_FEATURE_INCOMPAT_UNSUPPORTED))
+		return -BLKID_ERR_PARAM;
+
+    	get_ext2_info(probe->dev, id, buf);
+	return 0;
+}
+
+static int probe_ext2(struct blkid_probe *probe, struct blkid_magic *id,
+		      unsigned char *buf)
+{
+	struct ext2_super_block *es;
+
+	es = (struct ext2_super_block *)buf;
+
+	/* Distinguish between ext3 and ext2 */
+	if ((blkid_le32(es->s_feature_compat) &
+	      EXT3_FEATURE_COMPAT_HAS_JOURNAL))
+		return -BLKID_ERR_PARAM;
+
+	/* Any features which ext2 doesn't understand */
+	if ((blkid_le32(es->s_feature_ro_compat) &
+	     EXT2_FEATURE_RO_COMPAT_UNSUPPORTED) ||
+	    (blkid_le32(es->s_feature_incompat) &
+	     EXT2_FEATURE_INCOMPAT_UNSUPPORTED))
+		return -BLKID_ERR_PARAM;
+
+	/*
+	 * If ext2 is not present, but ext4 or ext4dev are, then
+	 * disclaim we are ext2
+	 */
+	if (!system_supports_ext2() &&
+	    (system_supports_ext4() || system_supports_ext4dev()) &&
+	    linux_version_code() >= EXT4_SUPPORTS_EXT2)
+		return -BLKID_ERR_PARAM;
+
+	get_ext2_info(probe->dev, id, buf);
+	return 0;
+}
+
+static int probe_jbd(struct blkid_probe *probe, struct blkid_magic *id,
+		     unsigned char *buf)
+{
+	struct ext2_super_block *es = (struct ext2_super_block *) buf;
+
+	if (!(blkid_le32(es->s_feature_incompat) &
+	      EXT3_FEATURE_INCOMPAT_JOURNAL_DEV))
+		return -BLKID_ERR_PARAM;
+
+	get_ext2_info(probe->dev, id, buf);
+
+	return 0;
+}
+
+#define FAT_ATTR_VOLUME_ID		0x08
+#define FAT_ATTR_DIR			0x10
+#define FAT_ATTR_LONG_NAME		0x0f
+#define FAT_ATTR_MASK			0x3f
+#define FAT_ENTRY_FREE			0xe5
+
+static const char *no_name = "NO NAME    ";
+
+static unsigned char *search_fat_label(struct vfat_dir_entry *dir, int count)
+{
+	int i;
+
+	for (i = 0; i < count; i++) {
+		if (dir[i].name[0] == 0x00)
+			break;
+
+		if ((dir[i].name[0] == FAT_ENTRY_FREE) ||
+		    (dir[i].cluster_high != 0 || dir[i].cluster_low != 0) ||
+		    ((dir[i].attr & FAT_ATTR_MASK) == FAT_ATTR_LONG_NAME))
+			continue;
+
+		if ((dir[i].attr & (FAT_ATTR_VOLUME_ID | FAT_ATTR_DIR)) ==
+		    FAT_ATTR_VOLUME_ID) {
+			return dir[i].name;
+		}
+	}
+	return 0;
+}
+
+/* FAT label extraction from the root directory taken from Kay
+ * Sievers's volume_id library */
+static int probe_fat(struct blkid_probe *probe,
+		      struct blkid_magic *id __BLKID_ATTR((unused)),
+		      unsigned char *buf)
+{
+	struct vfat_super_block *vs = (struct vfat_super_block *) buf;
+	struct msdos_super_block *ms = (struct msdos_super_block *) buf;
+	struct vfat_dir_entry *dir;
+	char serno[10];
+	const unsigned char *label = 0, *vol_label = 0, *tmp;
+	unsigned char	*vol_serno;
+	int label_len = 0, maxloop = 100;
+	__u16 sector_size, dir_entries, reserved;
+	__u32 sect_count, fat_size, dir_size, cluster_count, fat_length;
+	__u32 buf_size, start_data_sect, next, root_start, root_dir_entries;
+
+	/* sector size check */
+	tmp = (unsigned char *)&ms->ms_sector_size;
+	sector_size = tmp[0] + (tmp[1] << 8);
+	if (sector_size != 0x200 && sector_size != 0x400 &&
+	    sector_size != 0x800 && sector_size != 0x1000)
+		return 1;
+
+	tmp = (unsigned char *)&ms->ms_dir_entries;
+	dir_entries = tmp[0] + (tmp[1] << 8);
+	reserved =  blkid_le16(ms->ms_reserved);
+	tmp = (unsigned char *)&ms->ms_sectors;
+	sect_count = tmp[0] + (tmp[1] << 8);
+	if (sect_count == 0)
+		sect_count = blkid_le32(ms->ms_total_sect);
+
+	fat_length = blkid_le16(ms->ms_fat_length);
+	if (fat_length == 0)
+		fat_length = blkid_le32(vs->vs_fat32_length);
+
+	fat_size = fat_length * ms->ms_fats;
+	dir_size = ((dir_entries * sizeof(struct vfat_dir_entry)) +
+			(sector_size-1)) / sector_size;
+
+	cluster_count = sect_count - (reserved + fat_size + dir_size);
+	if (ms->ms_cluster_size == 0)
+		return 1;
+	cluster_count /= ms->ms_cluster_size;
+
+	if (cluster_count > FAT32_MAX)
+		return 1;
+
+	if (ms->ms_fat_length) {
+		/* the label may be an attribute in the root directory */
+		root_start = (reserved + fat_size) * sector_size;
+		root_dir_entries = vs->vs_dir_entries[0] +
+			(vs->vs_dir_entries[1] << 8);
+
+		buf_size = root_dir_entries * sizeof(struct vfat_dir_entry);
+		dir = (struct vfat_dir_entry *) get_buffer(probe, root_start,
+							   buf_size);
+		if (dir)
+			vol_label = search_fat_label(dir, root_dir_entries);
+
+		if (!vol_label || !memcmp(vol_label, no_name, 11))
+			vol_label = ms->ms_label;
+		vol_serno = ms->ms_serno;
+
+		blkid_set_tag(probe->dev, "SEC_TYPE", "msdos",
+			      sizeof("msdos"));
+	} else {
+		/* Search the FAT32 root dir for the label attribute */
+		buf_size = vs->vs_cluster_size * sector_size;
+		start_data_sect = reserved + fat_size;
+
+		next = blkid_le32(vs->vs_root_cluster);
+		while (next && --maxloop) {
+			__u32 next_sect_off;
+			__u64 next_off, fat_entry_off;
+			int count;
+
+			next_sect_off = (next - 2) * vs->vs_cluster_size;
+			next_off = (__u64) (start_data_sect + next_sect_off) *
+				sector_size;
+
+			dir = (struct vfat_dir_entry *)
+				get_buffer(probe, next_off, buf_size);
+			if (dir == NULL)
+				break;
+
+			count = buf_size / sizeof(struct vfat_dir_entry);
+
+			vol_label = search_fat_label(dir, count);
+			if (vol_label)
+				break;
+
+			/* get FAT entry */
+			fat_entry_off =
+				((unsigned int) reserved *
+				 (unsigned int) sector_size) +
+				(next * sizeof(__u32));
+			buf = get_buffer(probe, fat_entry_off, buf_size);
+			if (buf == NULL)
+				break;
+
+			/* set next cluster */
+			next = blkid_le32(*((__u32 *) buf) & 0x0fffffff);
+		}
+
+		if (!vol_label || !memcmp(vol_label, no_name, 11))
+			vol_label = vs->vs_label;
+		vol_serno = vs->vs_serno;
+	}
+
+	if (vol_label && memcmp(vol_label, no_name, 11)) {
+		if ((label_len = figure_label_len(vol_label, 11)))
+			label = vol_label;
+	}
+
+	/* We can't just print them as %04X, because they are unaligned */
+	sprintf(serno, "%02X%02X-%02X%02X", vol_serno[3], vol_serno[2],
+		vol_serno[1], vol_serno[0]);
+
+	blkid_set_tag(probe->dev, "LABEL", (const char *) label, label_len);
+	blkid_set_tag(probe->dev, "UUID", serno, sizeof(serno)-1);
+
+	return 0;
+}
+
+/*
+ * The FAT filesystem could be without a magic string in superblock
+ * (e.g. old floppies).  This heuristic for FAT detection is inspired
+ * by http://vrfy.org/projects/volume_id/ and Linux kernel.
+ * [7-Jul-2005, Karel Zak <kzak@redhat.com>]
+ */
+static int probe_fat_nomagic(struct blkid_probe *probe,
+			     struct blkid_magic *id __BLKID_ATTR((unused)),
+			     unsigned char *buf)
+{
+	struct msdos_super_block *ms;
+
+	ms = (struct msdos_super_block *)buf;
+
+	/* heads check */
+	if (ms->ms_heads == 0)
+		return 1;
+
+	/* cluster size check*/
+	if (ms->ms_cluster_size == 0 ||
+	    (ms->ms_cluster_size & (ms->ms_cluster_size-1)))
+		return 1;
+
+	/* media check */
+	if (ms->ms_media < 0xf8 && ms->ms_media != 0xf0)
+		return 1;
+
+	/* fat counts(Linux kernel expects at least 1 FAT table) */
+	if (!ms->ms_fats)
+		return 1;
+
+	/*
+	 * OS/2 and apparently DFSee will place a FAT12/16-like
+	 * pseudo-superblock in the first 512 bytes of non-FAT
+	 * filesystems --- at least JFS and HPFS, and possibly others.
+	 * So we explicitly check for those filesystems at the
+	 * FAT12/16 filesystem magic field identifier, and if they are
+	 * present, we rule this out as a FAT filesystem, despite the
+	 * FAT-like pseudo-header.
+         */
+	if ((memcmp(ms->ms_magic, "JFS     ", 8) == 0) ||
+	    (memcmp(ms->ms_magic, "HPFS    ", 8) == 0))
+		return 1;
+
+	return probe_fat(probe, id, buf);
+}
+
+static int probe_ntfs(struct blkid_probe *probe,
+		      struct blkid_magic *id __BLKID_ATTR((unused)),
+		      unsigned char *buf)
+{
+	struct ntfs_super_block *ns;
+	struct master_file_table_record *mft;
+	struct file_attribute *attr;
+	char		uuid_str[17], label_str[129], *cp;
+	int		bytes_per_sector, sectors_per_cluster;
+	int		mft_record_size, attr_off, attr_len;
+	unsigned int	i, attr_type, val_len;
+	int		val_off;
+	__u64		nr_clusters;
+	blkid_loff_t off;
+	unsigned char *buf_mft, *val;
+
+	ns = (struct ntfs_super_block *) buf;
+
+	bytes_per_sector = ns->bios_parameter_block[0] +
+		(ns->bios_parameter_block[1]  << 8);
+	sectors_per_cluster = ns->bios_parameter_block[2];
+
+	if ((bytes_per_sector < 512) || (sectors_per_cluster == 0))
+		return 1;
+
+	if (ns->cluster_per_mft_record < 0)
+		mft_record_size = 1 << (0-ns->cluster_per_mft_record);
+	else
+		mft_record_size = ns->cluster_per_mft_record *
+			sectors_per_cluster * bytes_per_sector;
+	nr_clusters = blkid_le64(ns->number_of_sectors) / sectors_per_cluster;
+
+	if ((blkid_le64(ns->mft_cluster_location) > nr_clusters) ||
+	    (blkid_le64(ns->mft_mirror_cluster_location) > nr_clusters))
+		return 1;
+
+	off = blkid_le64(ns->mft_mirror_cluster_location) *
+		bytes_per_sector * sectors_per_cluster;
+
+	buf_mft = get_buffer(probe, off, mft_record_size);
+	if (!buf_mft)
+		return 1;
+
+	if (memcmp(buf_mft, "FILE", 4))
+		return 1;
+
+	off = blkid_le64(ns->mft_cluster_location) * bytes_per_sector *
+		sectors_per_cluster;
+
+	buf_mft = get_buffer(probe, off, mft_record_size);
+	if (!buf_mft)
+		return 1;
+
+	if (memcmp(buf_mft, "FILE", 4))
+		return 1;
+
+	off += MFT_RECORD_VOLUME * mft_record_size;
+
+	buf_mft = get_buffer(probe, off, mft_record_size);
+	if (!buf_mft)
+		return 1;
+
+	if (memcmp(buf_mft, "FILE", 4))
+		return 1;
+
+	mft = (struct master_file_table_record *) buf_mft;
+
+	attr_off = blkid_le16(mft->attrs_offset);
+	label_str[0] = 0;
+
+	while (1) {
+		attr = (struct file_attribute *) (buf_mft + attr_off);
+		attr_len = blkid_le16(attr->len);
+		attr_type = blkid_le32(attr->type);
+		val_off = blkid_le16(attr->value_offset);
+		val_len = blkid_le32(attr->value_len);
+
+		attr_off += attr_len;
+
+		if ((attr_off > mft_record_size) ||
+		    (attr_len == 0))
+			break;
+
+		if (attr_type == MFT_RECORD_ATTR_END)
+			break;
+
+		if (attr_type == MFT_RECORD_ATTR_VOLUME_NAME) {
+			if (val_len > sizeof(label_str))
+				val_len = sizeof(label_str)-1;
+
+			for (i=0, cp=label_str; i < val_len; i+=2,cp++) {
+				val = ((__u8 *) attr) + val_off + i;
+				*cp = val[0];
+				if (val[1])
+					*cp = '?';
+			}
+			*cp = 0;
+		}
+	}
+
+	sprintf(uuid_str, "%016llX", blkid_le64(ns->volume_serial));
+	blkid_set_tag(probe->dev, "UUID", uuid_str, 0);
+	if (label_str[0])
+		blkid_set_tag(probe->dev, "LABEL", label_str, 0);
+	return 0;
+}
+
+
+static int probe_xfs(struct blkid_probe *probe,
+		     struct blkid_magic *id __BLKID_ATTR((unused)),
+		     unsigned char *buf)
+{
+	struct xfs_super_block *xs;
+	const char *label = 0;
+
+	xs = (struct xfs_super_block *)buf;
+
+	if (strlen(xs->xs_fname))
+		label = xs->xs_fname;
+	blkid_set_tag(probe->dev, "LABEL", label, sizeof(xs->xs_fname));
+	set_uuid(probe->dev, xs->xs_uuid, 0);
+	return 0;
+}
+
+static int probe_reiserfs(struct blkid_probe *probe,
+			  struct blkid_magic *id, unsigned char *buf)
+{
+	struct reiserfs_super_block *rs = (struct reiserfs_super_block *) buf;
+	unsigned int blocksize;
+	const char *label = 0;
+
+	blocksize = blkid_le16(rs->rs_blocksize);
+
+	/* The blocksize must be at least 1k */
+	if ((blocksize >> 10) == 0)
+		return -BLKID_ERR_PARAM;
+
+	/* If the superblock is inside the journal, we have the wrong one */
+	if (id->bim_kboff/(blocksize>>10) > blkid_le32(rs->rs_journal_block))
+		return -BLKID_ERR_BIG;
+
+	/* LABEL/UUID are only valid for later versions of Reiserfs v3.6. */
+	if (id->bim_magic[6] == '2' || id->bim_magic[6] == '3') {
+		if (strlen(rs->rs_label))
+			label = rs->rs_label;
+		set_uuid(probe->dev, rs->rs_uuid, 0);
+	}
+	blkid_set_tag(probe->dev, "LABEL", label, sizeof(rs->rs_label));
+
+	return 0;
+}
+
+static int probe_reiserfs4(struct blkid_probe *probe,
+			   struct blkid_magic *id __BLKID_ATTR((unused)),
+			   unsigned char *buf)
+{
+	struct reiser4_super_block *rs4 = (struct reiser4_super_block *) buf;
+	const unsigned char *label = 0;
+
+	if (strlen((char *) rs4->rs4_label))
+		label = rs4->rs4_label;
+	set_uuid(probe->dev, rs4->rs4_uuid, 0);
+	blkid_set_tag(probe->dev, "LABEL", (const char *) label,
+		      sizeof(rs4->rs4_label));
+
+	return 0;
+}
+
+static int probe_jfs(struct blkid_probe *probe,
+		     struct blkid_magic *id __BLKID_ATTR((unused)),
+		     unsigned char *buf)
+{
+	struct jfs_super_block *js;
+	const char *label = 0;
+
+	js = (struct jfs_super_block *)buf;
+
+	if (blkid_le32(js->js_bsize) != (1U << blkid_le16(js->js_l2bsize)))
+		return 1;
+
+	if (blkid_le32(js->js_pbsize) != (1U << blkid_le16(js->js_l2pbsize)))
+		return 1;
+
+	if ((blkid_le16(js->js_l2bsize) - blkid_le16(js->js_l2pbsize)) !=
+	    blkid_le16(js->js_l2bfactor))
+		return 1;
+
+	if (strlen((char *) js->js_label))
+		label = (char *) js->js_label;
+	blkid_set_tag(probe->dev, "LABEL", label, sizeof(js->js_label));
+	set_uuid(probe->dev, js->js_uuid, 0);
+	return 0;
+}
+
+static int probe_zfs(struct blkid_probe *probe __BLKID_ATTR((unused)),
+		     struct blkid_magic *id __BLKID_ATTR((unused)),
+		     unsigned char *buf __BLKID_ATTR((unused)))
+{
+#if 0
+	char *vdev_label;
+	const char *pool_name = 0;
+
+	/* read nvpair data for pool name, pool GUID (complex) */
+	blkid_set_tag(probe->dev, "LABEL", pool_name, sizeof(pool_name));
+	set_uuid(probe->dev, pool_guid, 0);
+#endif
+	return 0;
+}
+
+static int probe_luks(struct blkid_probe *probe,
+		       struct blkid_magic *id __BLKID_ATTR((unused)),
+		       unsigned char *buf)
+{
+	char uuid[41];
+
+	/* 168 is the offset to the 40 character uuid:
+	 * http://luks.endorphin.org/LUKS-on-disk-format.pdf */
+	strncpy(uuid, (char *) buf+168, 40);
+	uuid[40] = 0;
+	blkid_set_tag(probe->dev, "UUID", uuid, 40);
+	return 0;
+}
+
+static int probe_romfs(struct blkid_probe *probe,
+		       struct blkid_magic *id __BLKID_ATTR((unused)),
+		       unsigned char *buf)
+{
+	struct romfs_super_block *ros;
+	const char *label = 0;
+
+	ros = (struct romfs_super_block *)buf;
+
+	if (strlen((char *) ros->ros_volume))
+		label = (char *) ros->ros_volume;
+	blkid_set_tag(probe->dev, "LABEL", label, 0);
+	return 0;
+}
+
+static int probe_cramfs(struct blkid_probe *probe,
+			struct blkid_magic *id __BLKID_ATTR((unused)),
+			unsigned char *buf)
+{
+	struct cramfs_super_block *csb;
+	const char *label = 0;
+
+	csb = (struct cramfs_super_block *)buf;
+
+	if (strlen((char *) csb->name))
+		label = (char *) csb->name;
+	blkid_set_tag(probe->dev, "LABEL", label, 0);
+	return 0;
+}
+
+static int probe_swap0(struct blkid_probe *probe,
+		       struct blkid_magic *id __BLKID_ATTR((unused)),
+		       unsigned char *buf __BLKID_ATTR((unused)))
+{
+	blkid_set_tag(probe->dev, "UUID", 0, 0);
+	blkid_set_tag(probe->dev, "LABEL", 0, 0);
+	return 0;
+}
+
+static int probe_swap1(struct blkid_probe *probe,
+		       struct blkid_magic *id,
+		       unsigned char *buf __BLKID_ATTR((unused)))
+{
+	struct swap_id_block *sws;
+
+	probe_swap0(probe, id, buf);
+	/*
+	 * Version 1 swap headers are always located at offset of 1024
+	 * bytes, although the swap signature itself is located at the
+	 * end of the page (which may vary depending on hardware
+	 * pagesize).
+	 */
+	sws = (struct swap_id_block *) get_buffer(probe, 1024, 1024);
+	if (!sws)
+		return 1;
+
+	/* check for wrong version or zeroed pagecount, for sanity */
+	if (!memcmp(id->bim_magic, "SWAPSPACE2", id->bim_len) &&
+			(sws->sws_version != 1 || sws->sws_lastpage == 0))
+		return 1;
+
+	/* arbitrary sanity check.. is there any garbage down there? */
+	if (sws->sws_pad[32] == 0 && sws->sws_pad[33] == 0)  {
+		if (sws->sws_volume[0])
+			blkid_set_tag(probe->dev, "LABEL", sws->sws_volume,
+				      sizeof(sws->sws_volume));
+		if (sws->sws_uuid[0])
+			set_uuid(probe->dev, sws->sws_uuid, 0);
+	}
+	return 0;
+}
+
+static int probe_iso9660(struct blkid_probe *probe,
+			 struct blkid_magic *id __BLKID_ATTR((unused)),
+			 unsigned char *buf)
+{
+	struct iso_volume_descriptor *iso;
+	const unsigned char *label;
+
+	iso = (struct iso_volume_descriptor *) buf;
+	label = iso->volume_id;
+
+	blkid_set_tag(probe->dev, "LABEL", (const char *) label,
+		      figure_label_len(label, 32));
+	return 0;
+}
+
+
+static const char
+*udf_magic[] = { "BEA01", "BOOT2", "CD001", "CDW02", "NSR02",
+		 "NSR03", "TEA01", 0 };
+
+static int probe_udf(struct blkid_probe *probe,
+		     struct blkid_magic *id __BLKID_ATTR((unused)),
+		     unsigned char *buf __BLKID_ATTR((unused)))
+{
+	int j, bs;
+	struct iso_volume_descriptor *isosb;
+	const char ** m;
+
+	/* determine the block size by scanning in 2K increments
+	   (block sizes larger than 2K will be null padded) */
+	for (bs = 1; bs < 16; bs++) {
+		isosb = (struct iso_volume_descriptor *)
+			get_buffer(probe, (blkid_loff_t) bs*2048+32768,
+				   sizeof(*isosb));
+		if (!isosb)
+			return 1;
+		if (isosb->vd_id[0])
+			break;
+	}
+
+	/* Scan up to another 64 blocks looking for additional VSD's */
+	for (j = 1; j < 64; j++) {
+		if (j > 1) {
+			isosb = (struct iso_volume_descriptor *)
+				get_buffer(probe, j*bs*2048+32768,
+					   sizeof(*isosb));
+			if (!isosb)
+				return 1;
+		}
+		/* If we find NSR0x then call it udf:
+		   NSR01 for UDF 1.00
+		   NSR02 for UDF 1.50
+		   NSR03 for UDF 2.00 */
+		if (!memcmp(isosb->vd_id, "NSR0", 4))
+			return probe_iso9660(probe, id, buf);
+		for (m = udf_magic; *m; m++)
+			if (!memcmp(*m, isosb->vd_id, 5))
+				break;
+		if (*m == 0)
+			return 1;
+	}
+	return 1;
+}
+
+static int probe_ocfs(struct blkid_probe *probe,
+		      struct blkid_magic *id __BLKID_ATTR((unused)),
+		      unsigned char *buf)
+{
+	struct ocfs_volume_header ovh;
+	struct ocfs_volume_label ovl;
+	__u32 major;
+
+	memcpy(&ovh, buf, sizeof(ovh));
+	memcpy(&ovl, buf+512, sizeof(ovl));
+
+	major = ocfsmajor(ovh);
+	if (major == 1)
+		blkid_set_tag(probe->dev,"SEC_TYPE","ocfs1",sizeof("ocfs1"));
+	else if (major >= 9)
+		blkid_set_tag(probe->dev,"SEC_TYPE","ntocfs",sizeof("ntocfs"));
+
+	blkid_set_tag(probe->dev, "LABEL", ovl.label, ocfslabellen(ovl));
+	blkid_set_tag(probe->dev, "MOUNT", ovh.mount, ocfsmountlen(ovh));
+	set_uuid(probe->dev, ovl.vol_id, 0);
+	return 0;
+}
+
+static int probe_ocfs2(struct blkid_probe *probe,
+		       struct blkid_magic *id __BLKID_ATTR((unused)),
+		       unsigned char *buf)
+{
+	struct ocfs2_super_block *osb;
+
+	osb = (struct ocfs2_super_block *)buf;
+
+	blkid_set_tag(probe->dev, "LABEL", osb->s_label, sizeof(osb->s_label));
+	set_uuid(probe->dev, osb->s_uuid, 0);
+	return 0;
+}
+
+static int probe_oracleasm(struct blkid_probe *probe,
+			   struct blkid_magic *id __BLKID_ATTR((unused)),
+			   unsigned char *buf)
+{
+	struct oracle_asm_disk_label *dl;
+
+	dl = (struct oracle_asm_disk_label *)buf;
+
+	blkid_set_tag(probe->dev, "LABEL", dl->dl_id, sizeof(dl->dl_id));
+	return 0;
+}
+
+static int probe_gfs(struct blkid_probe *probe,
+		     struct blkid_magic *id __BLKID_ATTR((unused)),
+		     unsigned char *buf)
+{
+	struct gfs2_sb *sbd;
+	const char *label = 0;
+
+	sbd = (struct gfs2_sb *)buf;
+
+	if (blkid_be32(sbd->sb_fs_format) == GFS_FORMAT_FS &&
+	    blkid_be32(sbd->sb_multihost_format) == GFS_FORMAT_MULTI)
+	{
+		blkid_set_tag(probe->dev, "UUID", 0, 0);
+
+		if (strlen(sbd->sb_locktable))
+			label = sbd->sb_locktable;
+		blkid_set_tag(probe->dev, "LABEL", label, sizeof(sbd->sb_locktable));
+		return 0;
+	}
+	return 1;
+}
+
+static int probe_gfs2(struct blkid_probe *probe,
+		     struct blkid_magic *id __BLKID_ATTR((unused)),
+		     unsigned char *buf)
+{
+	struct gfs2_sb *sbd;
+	const char *label = 0;
+
+	sbd = (struct gfs2_sb *)buf;
+
+	if (blkid_be32(sbd->sb_fs_format) == GFS2_FORMAT_FS &&
+	    blkid_be32(sbd->sb_multihost_format) == GFS2_FORMAT_MULTI)
+	{
+		blkid_set_tag(probe->dev, "UUID", 0, 0);
+
+		if (strlen(sbd->sb_locktable))
+			label = sbd->sb_locktable;
+		blkid_set_tag(probe->dev, "LABEL", label, sizeof(sbd->sb_locktable));
+		return 0;
+	}
+	return 1;
+}
+
+static void unicode_16be_to_utf8(unsigned char *str, int out_len,
+				 const unsigned char *buf, int in_len)
+{
+	int i, j;
+	unsigned int c;
+
+	for (i = j = 0; i + 2 <= in_len; i += 2) {
+		c = (buf[i] << 8) | buf[i+1];
+		if (c == 0) {
+			str[j] = '\0';
+			break;
+		} else if (c < 0x80) {
+			if (j+1 >= out_len)
+				break;
+			str[j++] = (unsigned char) c;
+		} else if (c < 0x800) {
+			if (j+2 >= out_len)
+				break;
+			str[j++] = (unsigned char) (0xc0 | (c >> 6));
+			str[j++] = (unsigned char) (0x80 | (c & 0x3f));
+		} else {
+			if (j+3 >= out_len)
+				break;
+			str[j++] = (unsigned char) (0xe0 | (c >> 12));
+			str[j++] = (unsigned char) (0x80 | ((c >> 6) & 0x3f));
+			str[j++] = (unsigned char) (0x80 | (c & 0x3f));
+		}
+	}
+	str[j] = '\0';
+}
+
+static void unicode_16le_to_utf8(unsigned char *str, int out_len,
+				 const unsigned char *buf, int in_len)
+{
+	int i, j;
+	unsigned int c;
+
+	for (i = j = 0; i + 2 <= in_len; i += 2) {
+		c = (buf[i+1] << 8) | buf[i];
+		if (c == 0) {
+			str[j] = '\0';
+			break;
+		} else if (c < 0x80) {
+			if (j+1 >= out_len)
+				break;
+			str[j++] = (unsigned char) c;
+		} else if (c < 0x800) {
+			if (j+2 >= out_len)
+				break;
+			str[j++] = (unsigned char) (0xc0 | (c >> 6));
+			str[j++] = (unsigned char) (0x80 | (c & 0x3f));
+		} else {
+			if (j+3 >= out_len)
+				break;
+			str[j++] = (unsigned char) (0xe0 | (c >> 12));
+			str[j++] = (unsigned char) (0x80 | ((c >> 6) & 0x3f));
+			str[j++] = (unsigned char) (0x80 | (c & 0x3f));
+		}
+	}
+	str[j] = '\0';
+}
+
+static int probe_hfs(struct blkid_probe *probe __BLKID_ATTR((unused)),
+			 struct blkid_magic *id __BLKID_ATTR((unused)),
+			 unsigned char *buf)
+{
+	struct hfs_mdb *hfs = (struct hfs_mdb *)buf;
+	char	uuid_str[17];
+	__u64	uuid;
+
+	if ((memcmp(hfs->embed_sig, "H+", 2) == 0) ||
+	    (memcmp(hfs->embed_sig, "HX", 2) == 0))
+		return 1;	/* Not hfs, but an embedded HFS+ */
+
+	memcpy(&uuid, hfs->finder_info.id, 8);
+	uuid = blkid_le64(uuid);
+	if (uuid) {
+		sprintf(uuid_str, "%016llX", uuid);
+		blkid_set_tag(probe->dev, "UUID", uuid_str, 0);
+	}
+	blkid_set_tag(probe->dev, "LABEL", (char *)hfs->label, hfs->label_len);
+	return 0;
+}
+
+
+#define HFSPLUS_SECTOR_SIZE        512
+
+static int probe_hfsplus(struct blkid_probe *probe,
+			 struct blkid_magic *id,
+			 unsigned char *buf)
+{
+	struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT];
+	struct hfsplus_bnode_descriptor *descr;
+	struct hfsplus_bheader_record *bnode;
+	struct hfsplus_catalog_key *key;
+	struct hfsplus_vol_header *hfsplus;
+	struct hfs_mdb *sbd = (struct hfs_mdb *) buf;
+	unsigned int alloc_block_size;
+	unsigned int alloc_first_block;
+	unsigned int embed_first_block;
+	unsigned int off = 0;
+	unsigned int blocksize;
+	unsigned int cat_block;
+	unsigned int ext_block_start;
+	unsigned int ext_block_count;
+	unsigned int record_count;
+	unsigned int leaf_node_head;
+	unsigned int leaf_node_count;
+	unsigned int leaf_node_size;
+	unsigned int leaf_block;
+	unsigned int label_len;
+	__u64 leaf_off, uuid;
+	char	uuid_str[17], label[512];
+	int ext;
+
+	/* Check for a HFS+ volume embedded in a HFS volume */
+	if (memcmp(sbd->signature, "BD", 2) == 0) {
+		if ((memcmp(sbd->embed_sig, "H+", 2) != 0) &&
+		    (memcmp(sbd->embed_sig, "HX", 2) != 0))
+			/* This must be an HFS volume, so fail */
+			return 1;
+
+		alloc_block_size = blkid_be32(sbd->al_blk_size);
+		alloc_first_block = blkid_be16(sbd->al_bl_st);
+		embed_first_block = blkid_be16(sbd->embed_startblock);
+		off = (alloc_first_block * 512) +
+			(embed_first_block * alloc_block_size);
+		buf = get_buffer(probe, off + (id->bim_kboff * 1024),
+				 sizeof(*sbd));
+		if (!buf)
+			return 1;
+
+		hfsplus = (struct hfsplus_vol_header *) buf;
+	}
+
+	hfsplus = (struct hfsplus_vol_header *) buf;
+
+	if ((memcmp(hfsplus->signature, "H+", 2) != 0) &&
+	    (memcmp(hfsplus->signature, "HX", 2) != 0))
+		return 1;
+
+	memcpy(&uuid, hfsplus->finder_info.id, 8);
+	uuid = blkid_le64(uuid);
+	if (uuid) {
+		sprintf(uuid_str, "%016llX", uuid);
+		blkid_set_tag(probe->dev, "UUID", uuid_str, 0);
+	}
+
+	blocksize = blkid_be32(hfsplus->blocksize);
+	if (blocksize < HFSPLUS_SECTOR_SIZE)
+		return 1;
+
+	memcpy(extents, hfsplus->cat_file.extents, sizeof(extents));
+	cat_block = blkid_be32(extents[0].start_block);
+
+	buf = get_buffer(probe, off + ((__u64) cat_block * blocksize), 0x2000);
+	if (!buf)
+		return 0;
+
+	bnode = (struct hfsplus_bheader_record *)
+		&buf[sizeof(struct hfsplus_bnode_descriptor)];
+
+	leaf_node_head = blkid_be32(bnode->leaf_head);
+	leaf_node_size = blkid_be16(bnode->node_size);
+	leaf_node_count = blkid_be32(bnode->leaf_count);
+	if (leaf_node_count == 0)
+		return 0;
+
+	leaf_block = (leaf_node_head * leaf_node_size) / blocksize;
+
+	/* get physical location */
+	for (ext = 0; ext < HFSPLUS_EXTENT_COUNT; ext++) {
+		ext_block_start = blkid_be32(extents[ext].start_block);
+		ext_block_count = blkid_be32(extents[ext].block_count);
+		if (ext_block_count == 0)
+			return 0;
+
+		/* this is our extent */
+		if (leaf_block < ext_block_count)
+			break;
+
+		leaf_block -= ext_block_count;
+	}
+	if (ext == HFSPLUS_EXTENT_COUNT)
+		return 0;
+
+	leaf_off = (__u64) (ext_block_start + leaf_block) * blocksize;
+
+	buf = get_buffer(probe, off + leaf_off, leaf_node_size);
+	if (!buf)
+		return 0;
+
+	descr = (struct hfsplus_bnode_descriptor *) buf;
+	record_count = blkid_be16(descr->num_recs);
+	if (record_count == 0)
+		return 0;
+
+	if (descr->type != HFS_NODE_LEAF)
+		return 0;
+
+	key = (struct hfsplus_catalog_key *)
+		&buf[sizeof(struct hfsplus_bnode_descriptor)];
+
+	if (blkid_be32(key->parent_id) != HFSPLUS_POR_CNID)
+		return 0;
+
+	label_len = blkid_be16(key->unicode_len) * 2;
+	unicode_16be_to_utf8((unsigned char *)label, sizeof(label),
+			     key->unicode, label_len);
+	blkid_set_tag(probe->dev, "LABEL", label, 0);
+	return 0;
+}
+
+#define LVM2_LABEL_SIZE 512
+static unsigned int lvm2_calc_crc(const void *buf, unsigned int size)
+{
+	static const unsigned int crctab[] = {
+		0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
+		0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
+		0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
+		0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
+	};
+	unsigned int i, crc = 0xf597a6cf;
+	const __u8 *data = (const __u8 *) buf;
+
+	for (i = 0; i < size; i++) {
+		crc ^= *data++;
+		crc = (crc >> 4) ^ crctab[crc & 0xf];
+		crc = (crc >> 4) ^ crctab[crc & 0xf];
+	}
+	return crc;
+}
+
+static int probe_lvm2(struct blkid_probe *probe,
+			struct blkid_magic *id,
+			unsigned char *buf)
+{
+	int sector = (id->bim_kboff) << 1;
+	struct lvm2_pv_label_header *label= (struct lvm2_pv_label_header *)buf;
+	char *p, *q, uuid[40];
+	unsigned int i, b;
+
+	/* buf is at 0k or 1k offset; find label inside */
+	if (memcmp(buf, "LABELONE", 8) == 0) {
+		label = (struct lvm2_pv_label_header *)buf;
+	} else if (memcmp(buf + 512, "LABELONE", 8) == 0) {
+		label = (struct lvm2_pv_label_header *)(buf + 512);
+		sector++;
+	} else {
+		return 1;
+	}
+
+	if (blkid_le64(label->sector_xl) != (unsigned) sector) {
+		DBG(DEBUG_PROBE,
+		    printf("LVM2: label for sector %llu found at sector %d\n",
+			   blkid_le64(label->sector_xl), sector));
+		return 1;
+	}
+
+	if (lvm2_calc_crc(&label->offset_xl, LVM2_LABEL_SIZE -
+			  ((char *)&label->offset_xl - (char *)label)) !=
+			blkid_le32(label->crc_xl)) {
+		DBG(DEBUG_PROBE,
+		    printf("LVM2: label checksum incorrect at sector %d\n",
+			   sector));
+		return 1;
+	}
+
+	for (i=0, b=1, p=uuid, q= (char *) label->pv_uuid; i < LVM2_ID_LEN;
+	     i++, b <<= 1) {
+		if (b & 0x4444440)
+			*p++ = '-';
+		*p++ = *q++;
+	}
+
+	blkid_set_tag(probe->dev, "UUID", uuid, LVM2_ID_LEN+6);
+
+	return 0;
+}
+
+static int probe_btrfs(struct blkid_probe *probe,
+			struct blkid_magic *id __BLKID_ATTR((unused)),
+			unsigned char *buf)
+{
+	struct btrfs_super_block *bs;
+	const char *label = 0;
+
+	bs = (struct btrfs_super_block *)buf;
+
+	if (strlen(bs->label))
+		label = bs->label;
+	blkid_set_tag(probe->dev, "LABEL", label, sizeof(bs->label));
+	set_uuid(probe->dev, bs->fsid, 0);
+	return 0;
+}
+
+static int probe_f2fs(struct blkid_probe *probe,
+            struct blkid_magic *id __BLKID_ATTR((unused)),
+            unsigned char *buf)
+{
+    struct f2fs_super_block *bs;
+
+    bs = (struct f2fs_super_block *)buf;
+    set_uuid(probe->dev, bs->uuid, 0);
+    return 0;
+}
+
+static uint64_t exfat_block_to_offset(const struct exfat_super_block *sb,
+                                      uint64_t block)
+{
+    return block << sb->block_bits;
+}
+
+static uint64_t exfat_cluster_to_block(const struct exfat_super_block *sb,
+                                       uint32_t cluster)
+{
+    return sb->cluster_block_start +
+            ((uint64_t)(cluster - EXFAT_FIRST_DATA_CLUSTER) << sb->bpc_bits);
+}
+
+static uint64_t exfat_cluster_to_offset(const struct exfat_super_block *sb,
+                                        uint32_t cluster)
+{
+    return exfat_block_to_offset(sb, exfat_cluster_to_block(sb, cluster));
+}
+
+static uint32_t exfat_next_cluster(struct blkid_probe *probe,
+                                   const struct exfat_super_block *sb,
+                                   uint32_t cluster)
+{
+    uint32_t *next;
+    uint64_t offset;
+
+    offset = exfat_block_to_offset(sb, sb->fat_block_start)
+            + (uint64_t) cluster * sizeof (cluster);
+    next = (uint32_t *)get_buffer(probe, offset, sizeof (uint32_t));
+
+    return next ? *next : 0;
+}
+
+static struct exfat_entry_label *find_exfat_entry_label(
+    struct blkid_probe *probe, const struct exfat_super_block *sb)
+{
+    uint32_t cluster = sb->rootdir_cluster;
+    uint64_t offset = exfat_cluster_to_offset(sb, cluster);
+    uint8_t *entry;
+    const size_t max_iter = 10000;
+    size_t i = 0;
+
+    for (; i < max_iter; ++i) {
+        entry = (uint8_t *)get_buffer(probe, offset, EXFAT_ENTRY_SIZE);
+        if (!entry)
+            return NULL;
+        if (entry[0] == EXFAT_ENTRY_EOD)
+            return NULL;
+        if (entry[0] == EXFAT_ENTRY_LABEL)
+            return (struct exfat_entry_label*) entry;
+
+        offset += EXFAT_ENTRY_SIZE;
+        if (offset % CLUSTER_SIZE(sb) == 0) {
+            cluster = exfat_next_cluster(probe, sb, cluster);
+            if (cluster < EXFAT_FIRST_DATA_CLUSTER)
+                return NULL;
+            if (cluster > EXFAT_LAST_DATA_CLUSTER)
+                return NULL;
+            offset = exfat_cluster_to_offset(sb, cluster);
+        }
+    }
+
+    return NULL;
+}
+
+static int probe_exfat(struct blkid_probe *probe,
+		       struct blkid_magic *id __BLKID_ATTR((unused)),
+                       unsigned char *buf)
+{
+    struct exfat_super_block *sb;
+    struct exfat_entry_label *label;
+    char uuid[40];
+
+    sb = (struct exfat_super_block *)buf;
+    if (!sb || CLUSTER_SIZE(sb) == 0) {
+        DBG(DEBUG_PROBE, printf("bad exfat superblock.\n"));
+        return errno ? - errno : 1;
+    }
+
+    label = find_exfat_entry_label(probe, sb);
+    if (label) {
+        unsigned char utf8_label[128];
+        unicode_16le_to_utf8(utf8_label, sizeof(utf8_label), label->name, label->length * 2);
+        blkid_set_tag(probe->dev, "LABEL", (char *) utf8_label, 0);
+    } else {
+        blkid_set_tag(probe->dev, "LABEL", "disk", 4);
+    }
+
+    memset(uuid, 0, sizeof (uuid));
+    snprintf(uuid, sizeof (uuid), "%02hhX%02hhX-%02hhX%02hhX",
+             sb->volume_serial[3], sb->volume_serial[2],
+             sb->volume_serial[1], sb->volume_serial[0]);
+    blkid_set_tag(probe->dev, "UUID", uuid, strlen(uuid));
+
+    return 0;
+}
+
+/*
+ * Various filesystem magics that we can check for.  Note that kboff and
+ * sboff are in kilobytes and bytes respectively.  All magics are in
+ * byte strings so we don't worry about endian issues.
+ */
+static struct blkid_magic type_array[] = {
+/*  type     kboff   sboff len  magic			probe */
+  { "oracleasm", 0,	32,  8, "ORCLDISK",		probe_oracleasm },
+  { "ntfs",	 0,	 3,  8, "NTFS    ",		probe_ntfs },
+  { "jbd",	 1,   0x38,  2, "\123\357",		probe_jbd },
+  { "ext4dev",	 1,   0x38,  2, "\123\357",		probe_ext4dev },
+  { "ext4",	 1,   0x38,  2, "\123\357",		probe_ext4 },
+  { "ext3",	 1,   0x38,  2, "\123\357",		probe_ext3 },
+  { "ext2",	 1,   0x38,  2, "\123\357",		probe_ext2 },
+  { "reiserfs",	 8,   0x34,  8, "ReIsErFs",		probe_reiserfs },
+  { "reiserfs", 64,   0x34,  9, "ReIsEr2Fs",		probe_reiserfs },
+  { "reiserfs", 64,   0x34,  9, "ReIsEr3Fs",		probe_reiserfs },
+  { "reiserfs", 64,   0x34,  8, "ReIsErFs",		probe_reiserfs },
+  { "reiserfs",	 8,	20,  8, "ReIsErFs",		probe_reiserfs },
+  { "reiser4",  64,	 0,  7, "ReIsEr4",		probe_reiserfs4 },
+  { "gfs2",     64,      0,  4, "\x01\x16\x19\x70",     probe_gfs2 },
+  { "gfs",      64,      0,  4, "\x01\x16\x19\x70",     probe_gfs },
+  { "vfat",      0,   0x52,  5, "MSWIN",                probe_fat },
+  { "vfat",      0,   0x52,  8, "FAT32   ",             probe_fat },
+  { "vfat",      0,   0x36,  5, "MSDOS",                probe_fat },
+  { "vfat",      0,   0x36,  8, "FAT16   ",             probe_fat },
+  { "vfat",      0,   0x36,  8, "FAT12   ",             probe_fat },
+  { "vfat",      0,      0,  1, "\353",                 probe_fat_nomagic },
+  { "vfat",      0,      0,  1, "\351",                 probe_fat_nomagic },
+  { "vfat",      0,  0x1fe,  2, "\125\252",             probe_fat_nomagic },
+  { "minix",     1,   0x10,  2, "\177\023",             0 },
+  { "minix",     1,   0x10,  2, "\217\023",             0 },
+  { "minix",	 1,   0x10,  2, "\150\044",		0 },
+  { "minix",	 1,   0x10,  2, "\170\044",		0 },
+  { "vxfs",	 1,	 0,  4, "\365\374\001\245",	0 },
+  { "xfs",	 0,	 0,  4, "XFSB",			probe_xfs },
+  { "romfs",	 0,	 0,  8, "-rom1fs-",		probe_romfs },
+  { "bfs",	 0,	 0,  4, "\316\372\173\033",	0 },
+  { "cramfs",	 0,	 0,  4, "E=\315\050",		probe_cramfs },
+  { "qnx4",	 0,	 4,  6, "QNX4FS",		0 },
+  { "udf",	32,	 1,  5, "BEA01",		probe_udf },
+  { "udf",	32,	 1,  5, "BOOT2",		probe_udf },
+  { "udf",	32,	 1,  5, "CD001",		probe_udf },
+  { "udf",	32,	 1,  5, "CDW02",		probe_udf },
+  { "udf",	32,	 1,  5, "NSR02",		probe_udf },
+  { "udf",	32,	 1,  5, "NSR03",		probe_udf },
+  { "udf",	32,	 1,  5, "TEA01",		probe_udf },
+  { "iso9660",	32,	 1,  5, "CD001",		probe_iso9660 },
+  { "iso9660",	32,	 9,  5, "CDROM",		probe_iso9660 },
+  { "jfs",	32,	 0,  4, "JFS1",			probe_jfs },
+  /* ZFS has 128 root blocks (#4 is the first used), check only 6 of them */
+  { "zfs",     128,	 0,  8, "\0\0\0\0\0\xba\xb1\x0c", probe_zfs },
+  { "zfs",     128,	 0,  8, "\x0c\xb1\xba\0\0\0\0\0", probe_zfs },
+  { "zfs",     132,	 0,  8, "\0\0\0\0\0\xba\xb1\x0c", probe_zfs },
+  { "zfs",     132,	 0,  8, "\x0c\xb1\xba\0\0\0\0\0", probe_zfs },
+  { "zfs",     136,	 0,  8, "\0\0\0\0\0\xba\xb1\x0c", probe_zfs },
+  { "zfs",     136,	 0,  8, "\x0c\xb1\xba\0\0\0\0\0", probe_zfs },
+  { "zfs",     384,	 0,  8, "\0\0\0\0\0\xba\xb1\x0c", probe_zfs },
+  { "zfs",     384,	 0,  8, "\x0c\xb1\xba\0\0\0\0\0", probe_zfs },
+  { "zfs",     388,	 0,  8, "\0\0\0\0\0\xba\xb1\x0c", probe_zfs },
+  { "zfs",     388,	 0,  8, "\x0c\xb1\xba\0\0\0\0\0", probe_zfs },
+  { "zfs",     392,	 0,  8, "\0\0\0\0\0\xba\xb1\x0c", probe_zfs },
+  { "zfs",     392,	 0,  8, "\x0c\xb1\xba\0\0\0\0\0", probe_zfs },
+  { "hfsplus",	 1,	 0,  2, "BD",			probe_hfsplus },
+  { "hfsplus",	 1,	 0,  2, "H+",			probe_hfsplus },
+  { "hfsplus",	 1,	 0,  2, "HX",			probe_hfsplus },
+  { "hfs",	 1,	 0,  2, "BD",			probe_hfs },
+  { "ufs",	 8,  0x55c,  4, "T\031\001\000",	0 },
+  { "hpfs",	 8,	 0,  4, "I\350\225\371",	0 },
+  { "sysv",	 0,  0x3f8,  4, "\020~\030\375",	0 },
+  { "swap",	 0,  0xff6, 10, "SWAP-SPACE",		probe_swap0 },
+  { "swap",	 0,  0xff6, 10, "SWAPSPACE2",		probe_swap1 },
+  { "swsuspend", 0,  0xff6,  9, "S1SUSPEND",		probe_swap1 },
+  { "swsuspend", 0,  0xff6,  9, "S2SUSPEND",		probe_swap1 },
+  { "swsuspend", 0,  0xff6,  9, "ULSUSPEND",		probe_swap1 },
+  { "swap",	 0, 0x1ff6, 10, "SWAP-SPACE",		probe_swap0 },
+  { "swap",	 0, 0x1ff6, 10, "SWAPSPACE2",		probe_swap1 },
+  { "swsuspend", 0, 0x1ff6,  9, "S1SUSPEND",		probe_swap1 },
+  { "swsuspend", 0, 0x1ff6,  9, "S2SUSPEND",		probe_swap1 },
+  { "swsuspend", 0, 0x1ff6,  9, "ULSUSPEND",		probe_swap1 },
+  { "swap",	 0, 0x3ff6, 10, "SWAP-SPACE",		probe_swap0 },
+  { "swap",	 0, 0x3ff6, 10, "SWAPSPACE2",		probe_swap1 },
+  { "swsuspend", 0, 0x3ff6,  9, "S1SUSPEND",		probe_swap1 },
+  { "swsuspend", 0, 0x3ff6,  9, "S2SUSPEND",		probe_swap1 },
+  { "swsuspend", 0, 0x3ff6,  9, "ULSUSPEND",		probe_swap1 },
+  { "swap",	 0, 0x7ff6, 10, "SWAP-SPACE",		probe_swap0 },
+  { "swap",	 0, 0x7ff6, 10, "SWAPSPACE2",		probe_swap1 },
+  { "swsuspend", 0, 0x7ff6,  9, "S1SUSPEND",		probe_swap1 },
+  { "swsuspend", 0, 0x7ff6,  9, "S2SUSPEND",		probe_swap1 },
+  { "swsuspend", 0, 0x7ff6,  9, "ULSUSPEND",		probe_swap1 },
+  { "swap",	 0, 0xfff6, 10, "SWAP-SPACE",		probe_swap0 },
+  { "swap",	 0, 0xfff6, 10, "SWAPSPACE2",		probe_swap1 },
+  { "swsuspend", 0, 0xfff6,  9, "S1SUSPEND",		probe_swap1 },
+  { "swsuspend", 0, 0xfff6,  9, "S2SUSPEND",		probe_swap1 },
+  { "swsuspend", 0, 0xfff6,  9, "ULSUSPEND",		probe_swap1 },
+  { "ocfs",	 0,	 8,  9,	"OracleCFS",		probe_ocfs },
+  { "ocfs2",	 1,	 0,  6,	"OCFSV2",		probe_ocfs2 },
+  { "ocfs2",	 2,	 0,  6,	"OCFSV2",		probe_ocfs2 },
+  { "ocfs2",	 4,	 0,  6,	"OCFSV2",		probe_ocfs2 },
+  { "ocfs2",	 8,	 0,  6,	"OCFSV2",		probe_ocfs2 },
+  { "crypt_LUKS", 0,	 0,  6,	"LUKS\xba\xbe",		probe_luks },
+  { "squashfs",	 0,	 0,  4,	"sqsh",			0 },
+  { "squashfs",	 0,	 0,  4,	"hsqs",			0 },
+  { "lvm2pv",	 0,  0x218,  8, "LVM2 001",		probe_lvm2 },
+  { "lvm2pv",	 0,  0x018,  8, "LVM2 001",		probe_lvm2 },
+  { "lvm2pv",	 1,  0x018,  8, "LVM2 001",		probe_lvm2 },
+  { "lvm2pv",	 1,  0x218,  8, "LVM2 001",		probe_lvm2 },
+  { "btrfs",	 64,  0x40,  8, "_BHRfS_M",		probe_btrfs },
+  { "f2fs",	 1,      0,  4, "\x10\x20\xf5\xf2",	probe_f2fs },
+  { "exfat",     0,      3,  8, "EXFAT   ",             probe_exfat },
+  {   NULL,	 0,	 0,  0, NULL,			NULL }
+};
+
+/*
+ * Verify that the data in dev is consistent with what is on the actual
+ * block device (using the devname field only).  Normally this will be
+ * called when finding items in the cache, but for long running processes
+ * is also desirable to revalidate an item before use.
+ *
+ * If we are unable to revalidate the data, we return the old data and
+ * do not set the BLKID_BID_FL_VERIFIED flag on it.
+ */
+blkid_dev blkid_verify(blkid_cache cache, blkid_dev dev)
+{
+	struct blkid_magic *id;
+	struct blkid_probe probe;
+	blkid_tag_iterate iter;
+	unsigned char *buf;
+	const char *type, *value;
+	struct stat st;
+	time_t now;
+	double diff;
+	int idx;
+
+	if (!dev)
+		return NULL;
+
+	now = time(0);
+	diff = difftime(now, dev->bid_time);
+
+	if (stat(dev->bid_name, &st) < 0) {
+		DBG(DEBUG_PROBE,
+		    printf("blkid_verify: error %s (%d) while "
+			   "trying to stat %s\n", strerror(errno), errno,
+			   dev->bid_name));
+	open_err:
+		if ((errno == EPERM) || (errno == EACCES) || (errno == ENOENT)) {
+			/* We don't have read permission, just return cache data. */
+			DBG(DEBUG_PROBE, printf("returning unverified data for %s\n",
+						dev->bid_name));
+			return dev;
+		}
+		blkid_free_dev(dev);
+		return NULL;
+	}
+
+	if ((now >= dev->bid_time) &&
+	    (st.st_mtime <= dev->bid_time) &&
+	    ((diff < BLKID_PROBE_MIN) ||
+	     (dev->bid_flags & BLKID_BID_FL_VERIFIED &&
+	      diff < BLKID_PROBE_INTERVAL)))
+		return dev;
+
+	DBG(DEBUG_PROBE,
+	    printf("need to revalidate %s (cache time %lu, stat time %lu,\n\t"
+		   "time since last check %lu)\n",
+		   dev->bid_name, (unsigned long)dev->bid_time,
+		   (unsigned long)st.st_mtime, (unsigned long)diff));
+
+	if ((probe.fd = open(dev->bid_name, O_RDONLY)) < 0) {
+		DBG(DEBUG_PROBE, printf("blkid_verify: error %s (%d) while "
+					"opening %s\n", strerror(errno), errno,
+					dev->bid_name));
+		goto open_err;
+	}
+
+	probe.cache = cache;
+	probe.dev = dev;
+	probe.sbbuf = 0;
+	probe.buf = 0;
+	probe.buf_max = 0;
+
+	/*
+	 * Iterate over the type array.  If we already know the type,
+	 * then try that first.  If it doesn't work, then blow away
+	 * the type information, and try again.
+	 *
+	 */
+try_again:
+	type = 0;
+	if (!dev->bid_type || !strcmp(dev->bid_type, "mdraid")) {
+		uuid_t	uuid;
+
+		if (check_mdraid(probe.fd, uuid) == 0) {
+			set_uuid(dev, uuid, 0);
+			type = "mdraid";
+			goto found_type;
+		}
+	}
+	for (id = type_array; id->bim_type; id++) {
+		if (dev->bid_type &&
+		    strcmp(id->bim_type, dev->bid_type))
+			continue;
+
+		idx = id->bim_kboff + (id->bim_sboff >> 10);
+		buf = get_buffer(&probe, (__u64) idx << 10, 1024);
+		if (!buf)
+			continue;
+
+		if (memcmp(id->bim_magic, buf + (id->bim_sboff & 0x3ff),
+			   id->bim_len))
+			continue;
+
+		if ((id->bim_probe == NULL) ||
+		    (id->bim_probe(&probe, id, buf) == 0)) {
+			type = id->bim_type;
+			goto found_type;
+		}
+	}
+
+	if (!id->bim_type && dev->bid_type) {
+		/*
+		 * Zap the device filesystem information and try again
+		 */
+		DBG(DEBUG_PROBE,
+		    printf("previous fs type %s not valid, "
+			   "trying full probe\n", dev->bid_type));
+		iter = blkid_tag_iterate_begin(dev);
+		while (blkid_tag_next(iter, &type, &value) == 0)
+			blkid_set_tag(dev, type, 0, 0);
+		blkid_tag_iterate_end(iter);
+		goto try_again;
+	}
+
+	if (!dev->bid_type) {
+		blkid_free_dev(dev);
+		dev = 0;
+		goto found_type;
+	}
+
+found_type:
+	if (dev && type) {
+		dev->bid_devno = st.st_rdev;
+		dev->bid_time = time(0);
+		dev->bid_flags |= BLKID_BID_FL_VERIFIED;
+		cache->bic_flags |= BLKID_BIC_FL_CHANGED;
+
+		blkid_set_tag(dev, "TYPE", type, 0);
+
+		DBG(DEBUG_PROBE, printf("%s: devno 0x%04llx, type %s\n",
+			   dev->bid_name, (long long)st.st_rdev, type));
+	}
+
+	free(probe.sbbuf);
+	free(probe.buf);
+	if (probe.fd >= 0)
+		close(probe.fd);
+
+	return dev;
+}
+
+int blkid_known_fstype(const char *fstype)
+{
+	struct blkid_magic *id;
+
+	for (id = type_array; id->bim_type; id++) {
+		if (strcmp(fstype, id->bim_type) == 0)
+			return 1;
+	}
+	return 0;
+}
+
+#ifdef TEST_PROGRAM
+int main(int argc, char **argv)
+{
+	blkid_dev dev;
+	blkid_cache cache;
+	int ret;
+
+	if (argc != 2) {
+		fprintf(stderr, "Usage: %s device\n"
+			"Probe a single device to determine type\n", argv[0]);
+		exit(1);
+	}
+	if ((ret = blkid_get_cache(&cache, "/dev/null")) != 0) {
+		fprintf(stderr, "%s: error creating cache (%d)\n",
+			argv[0], ret);
+		exit(1);
+	}
+	dev = blkid_get_dev(cache, argv[1], BLKID_DEV_NORMAL);
+	if (!dev) {
+		printf("%s: %s has an unsupported type\n", argv[0], argv[1]);
+		return (1);
+	}
+	printf("TYPE='%s'\n", dev->bid_type ? dev->bid_type : "(null)");
+	if (dev->bid_label)
+		printf("LABEL='%s'\n", dev->bid_label);
+	if (dev->bid_uuid)
+		printf("UUID='%s'\n", dev->bid_uuid);
+
+	blkid_free_dev(dev);
+	return (0);
+}
+#endif