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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:49:25 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:49:25 +0000
commit464df1d5e5ab1322e2dd0a7796939fff1aeefa9a (patch)
tree6a403684e0978f0287d7f0ec0e5aab1fd31a59e1 /lib/blkid/probe.c
parentInitial commit. (diff)
downloade2fsprogs-db58a52ab489b66cea7224323c4c6171ccc2a9dd.tar.xz
e2fsprogs-db58a52ab489b66cea7224323c4c6171ccc2a9dd.zip
Adding upstream version 1.47.0.upstream/1.47.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'lib/blkid/probe.c')
-rw-r--r--lib/blkid/probe.c1841
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