diff options
Diffstat (limited to 'lib/blkid/probe.c')
| -rw-r--r-- | lib/blkid/probe.c | 1841 |
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 |