[821] | 1 | /*
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| 2 | * probe.c - identify a block device by its contents, and return a dev
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| 3 | * struct with the details
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| 4 | *
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| 5 | * Copyright (C) 1999 by Andries Brouwer
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| 6 | * Copyright (C) 1999, 2000, 2003 by Theodore Ts'o
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| 7 | * Copyright (C) 2001 by Andreas Dilger
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| 8 | *
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| 9 | * %Begin-Header%
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| 10 | * This file may be redistributed under the terms of the
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| 11 | * GNU Lesser General Public License.
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| 12 | * %End-Header%
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| 13 | */
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| 14 |
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| 15 | #include <stdio.h>
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| 16 | #include <string.h>
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| 17 | #include <stdlib.h>
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| 18 | #include <unistd.h>
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| 19 | #include <fcntl.h>
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| 20 | #include <sys/types.h>
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| 21 | #ifdef HAVE_SYS_STAT_H
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| 22 | #include <sys/stat.h>
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| 23 | #endif
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| 24 | #ifdef HAVE_SYS_MKDEV_H
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| 25 | #include <sys/mkdev.h>
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| 26 | #endif
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| 27 | #ifdef HAVE_ERRNO_H
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| 28 | #include <errno.h>
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| 29 | #endif
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| 30 | #include "blkidP.h"
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| 31 | #include "../uuid/uuid.h"
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| 32 | #include "probe.h"
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| 33 |
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| 34 | /*
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| 35 | * This is a special case code to check for an MDRAID device. We do
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| 36 | * this special since it requires checking for a superblock at the end
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| 37 | * of the device.
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| 38 | */
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| 39 | static int check_mdraid(int fd, unsigned char *ret_uuid)
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| 40 | {
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| 41 | struct mdp_superblock_s *md;
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| 42 | blkid_loff_t offset;
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| 43 | char buf[4096];
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| 44 |
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| 45 | if (fd < 0)
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| 46 | return -BLKID_ERR_PARAM;
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| 47 |
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| 48 | offset = (blkid_get_dev_size(fd) & ~((blkid_loff_t)65535)) - 65536;
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| 49 |
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| 50 | if (blkid_llseek(fd, offset, 0) < 0 ||
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| 51 | read(fd, buf, 4096) != 4096)
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| 52 | return -BLKID_ERR_IO;
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| 53 |
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| 54 | /* Check for magic number */
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| 55 | if (memcmp("\251+N\374", buf, 4))
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| 56 | return -BLKID_ERR_PARAM;
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| 57 |
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| 58 | if (!ret_uuid)
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| 59 | return 0;
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| 60 | *ret_uuid = 0;
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| 61 |
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| 62 | /* The MD UUID is not contiguous in the superblock, make it so */
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| 63 | md = (struct mdp_superblock_s *)buf;
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| 64 | if (md->set_uuid0 || md->set_uuid1 || md->set_uuid2 || md->set_uuid3) {
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| 65 | memcpy(ret_uuid, &md->set_uuid0, 4);
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| 66 | memcpy(ret_uuid, &md->set_uuid1, 12);
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| 67 | }
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| 68 | return 0;
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| 69 | }
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| 70 |
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| 71 | static void set_uuid(blkid_dev dev, uuid_t uuid)
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| 72 | {
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| 73 | char str[37];
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| 74 |
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| 75 | if (!uuid_is_null(uuid)) {
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| 76 | uuid_unparse(uuid, str);
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| 77 | blkid_set_tag(dev, "UUID", str, sizeof(str));
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| 78 | }
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| 79 | }
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| 80 |
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| 81 | static void get_ext2_info(blkid_dev dev, unsigned char *buf)
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| 82 | {
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| 83 | struct ext2_super_block *es = (struct ext2_super_block *) buf;
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| 84 | const char *label = 0;
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| 85 |
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| 86 | DBG(DEBUG_PROBE, printf("ext2_sb.compat = %08X:%08X:%08X\n",
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| 87 | blkid_le32(es->s_feature_compat),
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| 88 | blkid_le32(es->s_feature_incompat),
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| 89 | blkid_le32(es->s_feature_ro_compat)));
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| 90 |
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| 91 | if (strlen(es->s_volume_name))
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| 92 | label = es->s_volume_name;
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| 93 | blkid_set_tag(dev, "LABEL", label, sizeof(es->s_volume_name));
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| 94 |
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| 95 | set_uuid(dev, es->s_uuid);
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| 96 | }
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| 97 |
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| 98 | static int probe_ext3(int fd __BLKID_ATTR((unused)),
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| 99 | blkid_cache cache __BLKID_ATTR((unused)),
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| 100 | blkid_dev dev,
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| 101 | const struct blkid_magic *id __BLKID_ATTR((unused)),
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| 102 | unsigned char *buf)
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| 103 | {
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| 104 | struct ext2_super_block *es;
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| 105 |
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| 106 | es = (struct ext2_super_block *)buf;
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| 107 |
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| 108 | /* Distinguish between jbd and ext2/3 fs */
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| 109 | if (blkid_le32(es->s_feature_incompat) &
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| 110 | EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)
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| 111 | return -BLKID_ERR_PARAM;
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| 112 |
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| 113 | /* Distinguish between ext3 and ext2 */
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| 114 | if (!(blkid_le32(es->s_feature_compat) &
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| 115 | EXT3_FEATURE_COMPAT_HAS_JOURNAL))
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| 116 | return -BLKID_ERR_PARAM;
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| 117 |
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| 118 | get_ext2_info(dev, buf);
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| 119 |
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| 120 | blkid_set_tag(dev, "SEC_TYPE", "ext2", sizeof("ext2"));
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| 121 |
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| 122 | return 0;
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| 123 | }
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| 124 |
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| 125 | static int probe_ext2(int fd __BLKID_ATTR((unused)),
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| 126 | blkid_cache cache __BLKID_ATTR((unused)),
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| 127 | blkid_dev dev,
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| 128 | const struct blkid_magic *id __BLKID_ATTR((unused)),
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| 129 | unsigned char *buf)
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| 130 | {
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| 131 | struct ext2_super_block *es;
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| 132 |
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| 133 | es = (struct ext2_super_block *)buf;
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| 134 |
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| 135 | /* Distinguish between jbd and ext2/3 fs */
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| 136 | if (blkid_le32(es->s_feature_incompat) &
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| 137 | EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)
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| 138 | return -BLKID_ERR_PARAM;
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| 139 |
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| 140 | get_ext2_info(dev, buf);
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| 141 |
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| 142 | return 0;
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| 143 | }
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| 144 |
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| 145 | static int probe_jbd(int fd __BLKID_ATTR((unused)),
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| 146 | blkid_cache cache __BLKID_ATTR((unused)),
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| 147 | blkid_dev dev,
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| 148 | const struct blkid_magic *id __BLKID_ATTR((unused)),
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| 149 | unsigned char *buf)
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| 150 | {
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| 151 | struct ext2_super_block *es = (struct ext2_super_block *) buf;
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| 152 |
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| 153 | if (!(blkid_le32(es->s_feature_incompat) &
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| 154 | EXT3_FEATURE_INCOMPAT_JOURNAL_DEV))
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| 155 | return -BLKID_ERR_PARAM;
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| 156 |
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| 157 | get_ext2_info(dev, buf);
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| 158 |
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| 159 | return 0;
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| 160 | }
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| 161 |
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| 162 | static int probe_vfat(int fd __BLKID_ATTR((unused)),
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| 163 | blkid_cache cache __BLKID_ATTR((unused)),
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| 164 | blkid_dev dev,
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| 165 | const struct blkid_magic *id __BLKID_ATTR((unused)),
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| 166 | unsigned char *buf)
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| 167 | {
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| 168 | struct vfat_super_block *vs;
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| 169 | char serno[10];
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| 170 | const char *label = 0;
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| 171 | int label_len = 0;
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| 172 |
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| 173 | vs = (struct vfat_super_block *)buf;
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| 174 |
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| 175 | if (strncmp(vs->vs_label, "NO NAME", 7)) {
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| 176 | char *end = vs->vs_label + sizeof(vs->vs_label) - 1;
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| 177 |
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| 178 | while (*end == ' ' && end >= vs->vs_label)
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| 179 | --end;
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| 180 | if (end >= vs->vs_label) {
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| 181 | label = vs->vs_label;
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| 182 | label_len = end - vs->vs_label + 1;
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| 183 | }
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| 184 | }
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| 185 |
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| 186 | /* We can't just print them as %04X, because they are unaligned */
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| 187 | sprintf(serno, "%02X%02X-%02X%02X", vs->vs_serno[3], vs->vs_serno[2],
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| 188 | vs->vs_serno[1], vs->vs_serno[0]);
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| 189 | blkid_set_tag(dev, "LABEL", label, label_len);
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| 190 | blkid_set_tag(dev, "UUID", serno, sizeof(serno));
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| 191 |
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| 192 | return 0;
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| 193 | }
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| 194 |
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| 195 | static int probe_msdos(int fd __BLKID_ATTR((unused)),
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| 196 | blkid_cache cache __BLKID_ATTR((unused)),
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| 197 | blkid_dev dev,
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| 198 | const struct blkid_magic *id __BLKID_ATTR((unused)),
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| 199 | unsigned char *buf)
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| 200 | {
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| 201 | struct msdos_super_block *ms = (struct msdos_super_block *) buf;
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| 202 | char serno[10];
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| 203 | const char *label = 0;
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| 204 | int label_len = 0;
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| 205 |
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| 206 | if (strncmp(ms->ms_label, "NO NAME", 7)) {
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| 207 | char *end = ms->ms_label + sizeof(ms->ms_label) - 1;
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| 208 |
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| 209 | while (*end == ' ' && end >= ms->ms_label)
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| 210 | --end;
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| 211 | if (end >= ms->ms_label) {
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| 212 | label = ms->ms_label;
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| 213 | label_len = end - ms->ms_label + 1;
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| 214 | }
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| 215 | }
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| 216 |
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| 217 | /* We can't just print them as %04X, because they are unaligned */
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| 218 | sprintf(serno, "%02X%02X-%02X%02X", ms->ms_serno[3], ms->ms_serno[2],
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| 219 | ms->ms_serno[1], ms->ms_serno[0]);
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| 220 | blkid_set_tag(dev, "UUID", serno, 0);
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| 221 | blkid_set_tag(dev, "LABEL", label, label_len);
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| 222 | blkid_set_tag(dev, "SEC_TYPE", "msdos", sizeof("msdos"));
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| 223 |
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| 224 | return 0;
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| 225 | }
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| 226 |
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| 227 | static int probe_xfs(int fd __BLKID_ATTR((unused)),
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| 228 | blkid_cache cache __BLKID_ATTR((unused)),
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| 229 | blkid_dev dev,
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| 230 | const struct blkid_magic *id __BLKID_ATTR((unused)),
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| 231 | unsigned char *buf)
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| 232 | {
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| 233 | struct xfs_super_block *xs;
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| 234 | const char *label = 0;
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| 235 |
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| 236 | xs = (struct xfs_super_block *)buf;
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| 237 |
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| 238 | if (strlen(xs->xs_fname))
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| 239 | label = xs->xs_fname;
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| 240 | blkid_set_tag(dev, "LABEL", label, sizeof(xs->xs_fname));
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| 241 | set_uuid(dev, xs->xs_uuid);
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| 242 | return 0;
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| 243 | }
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| 244 |
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| 245 | static int probe_reiserfs(int fd __BLKID_ATTR((unused)),
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| 246 | blkid_cache cache __BLKID_ATTR((unused)),
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| 247 | blkid_dev dev,
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| 248 | const struct blkid_magic *id, unsigned char *buf)
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| 249 | {
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| 250 | struct reiserfs_super_block *rs = (struct reiserfs_super_block *) buf;
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| 251 | unsigned int blocksize;
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| 252 | const char *label = 0;
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| 253 |
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| 254 | blocksize = blkid_le16(rs->rs_blocksize);
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| 255 |
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| 256 | /* If the superblock is inside the journal, we have the wrong one */
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| 257 | if (id->bim_kboff/(blocksize>>10) > blkid_le32(rs->rs_journal_block))
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| 258 | return -BLKID_ERR_BIG;
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| 259 |
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| 260 | /* LABEL/UUID are only valid for later versions of Reiserfs v3.6. */
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| 261 | if (!strcmp(id->bim_magic, "ReIsEr2Fs") ||
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| 262 | !strcmp(id->bim_magic, "ReIsEr3Fs")) {
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| 263 | if (strlen(rs->rs_label))
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| 264 | label = rs->rs_label;
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| 265 | set_uuid(dev, rs->rs_uuid);
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| 266 | }
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| 267 | blkid_set_tag(dev, "LABEL", label, sizeof(rs->rs_label));
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| 268 |
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| 269 | return 0;
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| 270 | }
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| 271 |
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| 272 | static int probe_jfs(int fd __BLKID_ATTR((unused)),
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| 273 | blkid_cache cache __BLKID_ATTR((unused)),
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| 274 | blkid_dev dev,
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| 275 | const struct blkid_magic *id __BLKID_ATTR((unused)),
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| 276 | unsigned char *buf)
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| 277 | {
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| 278 | struct jfs_super_block *js;
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| 279 | const char *label = 0;
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| 280 |
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| 281 | js = (struct jfs_super_block *)buf;
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| 282 |
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| 283 | if (strlen((char *) js->js_label))
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| 284 | label = (char *) js->js_label;
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| 285 | blkid_set_tag(dev, "LABEL", label, sizeof(js->js_label));
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| 286 | set_uuid(dev, js->js_uuid);
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| 287 | return 0;
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| 288 | }
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| 289 |
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| 290 | static int probe_romfs(int fd __BLKID_ATTR((unused)),
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| 291 | blkid_cache cache __BLKID_ATTR((unused)),
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| 292 | blkid_dev dev,
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| 293 | const struct blkid_magic *id __BLKID_ATTR((unused)),
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| 294 | unsigned char *buf)
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| 295 | {
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| 296 | struct romfs_super_block *ros;
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| 297 | const char *label = 0;
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| 298 |
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| 299 | ros = (struct romfs_super_block *)buf;
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| 300 |
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| 301 | if (strlen((char *) ros->ros_volume))
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| 302 | label = (char *) ros->ros_volume;
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| 303 | blkid_set_tag(dev, "LABEL", label, 0);
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| 304 | return 0;
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| 305 | }
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| 306 |
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| 307 | static int probe_cramfs(int fd __BLKID_ATTR((unused)),
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| 308 | blkid_cache cache __BLKID_ATTR((unused)),
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| 309 | blkid_dev dev,
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| 310 | const struct blkid_magic *id __BLKID_ATTR((unused)),
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| 311 | unsigned char *buf)
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| 312 | {
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| 313 | struct cramfs_super_block *csb;
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| 314 | const char *label = 0;
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| 315 |
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| 316 | csb = (struct cramfs_super_block *)buf;
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| 317 |
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| 318 | if (strlen((char *) csb->name))
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| 319 | label = (char *) csb->name;
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| 320 | blkid_set_tag(dev, "LABEL", label, 0);
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| 321 | return 0;
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| 322 | }
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| 323 |
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| 324 | static int probe_swap0(int fd __BLKID_ATTR((unused)),
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| 325 | blkid_cache cache __BLKID_ATTR((unused)),
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| 326 | blkid_dev dev,
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| 327 | const struct blkid_magic *id __BLKID_ATTR((unused)),
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| 328 | unsigned char *buf __BLKID_ATTR((unused)))
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| 329 | {
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| 330 | blkid_set_tag(dev, "UUID", 0, 0);
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| 331 | blkid_set_tag(dev, "LABEL", 0, 0);
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| 332 | return 0;
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| 333 | }
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| 334 |
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| 335 | static int probe_swap1(int fd,
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| 336 | blkid_cache cache __BLKID_ATTR((unused)),
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| 337 | blkid_dev dev,
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| 338 | const struct blkid_magic *id __BLKID_ATTR((unused)),
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| 339 | unsigned char *buf __BLKID_ATTR((unused)))
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| 340 | {
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| 341 | struct swap_id_block *sws;
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| 342 |
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| 343 | probe_swap0(fd, cache, dev, id, buf);
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| 344 | /*
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| 345 | * Version 1 swap headers are always located at offset of 1024
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| 346 | * bytes, although the swap signature itself is located at the
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| 347 | * end of the page (which may vary depending on hardware
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| 348 | * pagesize).
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| 349 | */
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| 350 | if (lseek(fd, 1024, SEEK_SET) < 0) return 1;
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| 351 | sws = (struct swap_id_block *)xmalloc(1024);
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| 352 | if (read(fd, sws, 1024) != 1024) {
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| 353 | free(sws);
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| 354 | return 1;
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| 355 | }
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| 356 |
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| 357 | /* arbitrary sanity check.. is there any garbage down there? */
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| 358 | if (sws->sws_pad[32] == 0 && sws->sws_pad[33] == 0) {
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| 359 | if (sws->sws_volume[0])
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| 360 | blkid_set_tag(dev, "LABEL", (const char*)sws->sws_volume,
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| 361 | sizeof(sws->sws_volume));
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| 362 | if (sws->sws_uuid[0])
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| 363 | set_uuid(dev, sws->sws_uuid);
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| 364 | }
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| 365 | free(sws);
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| 366 |
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| 367 | return 0;
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| 368 | }
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| 369 |
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| 370 | static const char
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| 371 | * const udf_magic[] = { "BEA01", "BOOT2", "CD001", "CDW02", "NSR02",
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| 372 | "NSR03", "TEA01", 0 };
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| 373 |
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| 374 | static int probe_udf(int fd, blkid_cache cache __BLKID_ATTR((unused)),
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| 375 | blkid_dev dev __BLKID_ATTR((unused)),
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| 376 | const struct blkid_magic *id __BLKID_ATTR((unused)),
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| 377 | unsigned char *buf __BLKID_ATTR((unused)))
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| 378 | {
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| 379 | int j, bs;
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| 380 | struct iso_volume_descriptor isosb;
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| 381 | const char * const * m;
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| 382 |
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| 383 | /* determine the block size by scanning in 2K increments
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| 384 | (block sizes larger than 2K will be null padded) */
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| 385 | for (bs = 1; bs < 16; bs++) {
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| 386 | lseek(fd, bs*2048+32768, SEEK_SET);
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| 387 | if (read(fd, (char *)&isosb, sizeof(isosb)) != sizeof(isosb))
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| 388 | return 1;
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| 389 | if (isosb.id[0])
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| 390 | break;
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| 391 | }
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| 392 |
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| 393 | /* Scan up to another 64 blocks looking for additional VSD's */
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| 394 | for (j = 1; j < 64; j++) {
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| 395 | if (j > 1) {
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| 396 | lseek(fd, j*bs*2048+32768, SEEK_SET);
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| 397 | if (read(fd, (char *)&isosb, sizeof(isosb))
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| 398 | != sizeof(isosb))
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| 399 | return 1;
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| 400 | }
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| 401 | /* If we find NSR0x then call it udf:
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| 402 | NSR01 for UDF 1.00
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| 403 | NSR02 for UDF 1.50
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| 404 | NSR03 for UDF 2.00 */
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| 405 | if (!strncmp(isosb.id, "NSR0", 4))
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| 406 | return 0;
|
---|
| 407 | for (m = udf_magic; *m; m++)
|
---|
| 408 | if (!strncmp(*m, isosb.id, 5))
|
---|
| 409 | break;
|
---|
| 410 | if (*m == 0)
|
---|
| 411 | return 1;
|
---|
| 412 | }
|
---|
| 413 | return 1;
|
---|
| 414 | }
|
---|
| 415 |
|
---|
| 416 | static int probe_ocfs(int fd __BLKID_ATTR((unused)),
|
---|
| 417 | blkid_cache cache __BLKID_ATTR((unused)),
|
---|
| 418 | blkid_dev dev,
|
---|
| 419 | const struct blkid_magic *id __BLKID_ATTR((unused)),
|
---|
| 420 | unsigned char *buf)
|
---|
| 421 | {
|
---|
| 422 | struct ocfs_volume_header ovh;
|
---|
| 423 | struct ocfs_volume_label ovl;
|
---|
| 424 | __u32 major;
|
---|
| 425 |
|
---|
| 426 | memcpy(&ovh, buf, sizeof(ovh));
|
---|
| 427 | memcpy(&ovl, buf+512, sizeof(ovl));
|
---|
| 428 |
|
---|
| 429 | major = ocfsmajor(ovh);
|
---|
| 430 | if (major == 1)
|
---|
| 431 | blkid_set_tag(dev,"SEC_TYPE","ocfs1",sizeof("ocfs1"));
|
---|
| 432 | else if (major >= 9)
|
---|
| 433 | blkid_set_tag(dev,"SEC_TYPE","ntocfs",sizeof("ntocfs"));
|
---|
| 434 |
|
---|
| 435 | blkid_set_tag(dev, "LABEL", (const char*)ovl.label, ocfslabellen(ovl));
|
---|
| 436 | blkid_set_tag(dev, "MOUNT", (const char*)ovh.mount, ocfsmountlen(ovh));
|
---|
| 437 | set_uuid(dev, ovl.vol_id);
|
---|
| 438 | return 0;
|
---|
| 439 | }
|
---|
| 440 |
|
---|
| 441 | static int probe_ocfs2(int fd __BLKID_ATTR((unused)),
|
---|
| 442 | blkid_cache cache __BLKID_ATTR((unused)),
|
---|
| 443 | blkid_dev dev,
|
---|
| 444 | const struct blkid_magic *id __BLKID_ATTR((unused)),
|
---|
| 445 | unsigned char *buf)
|
---|
| 446 | {
|
---|
| 447 | struct ocfs2_super_block *osb;
|
---|
| 448 |
|
---|
| 449 | osb = (struct ocfs2_super_block *)buf;
|
---|
| 450 |
|
---|
| 451 | blkid_set_tag(dev, "LABEL", (const char*)osb->s_label, sizeof(osb->s_label));
|
---|
| 452 | set_uuid(dev, osb->s_uuid);
|
---|
| 453 | return 0;
|
---|
| 454 | }
|
---|
| 455 |
|
---|
| 456 | static int probe_oracleasm(int fd __BLKID_ATTR((unused)),
|
---|
| 457 | blkid_cache cache __BLKID_ATTR((unused)),
|
---|
| 458 | blkid_dev dev,
|
---|
| 459 | const struct blkid_magic *id __BLKID_ATTR((unused)),
|
---|
| 460 | unsigned char *buf)
|
---|
| 461 | {
|
---|
| 462 | struct oracle_asm_disk_label *dl;
|
---|
| 463 |
|
---|
| 464 | dl = (struct oracle_asm_disk_label *)buf;
|
---|
| 465 |
|
---|
| 466 | blkid_set_tag(dev, "LABEL", dl->dl_id, sizeof(dl->dl_id));
|
---|
| 467 | return 0;
|
---|
| 468 | }
|
---|
| 469 |
|
---|
| 470 | /*
|
---|
| 471 | * BLKID_BLK_OFFS is at least as large as the highest bim_kboff defined
|
---|
| 472 | * in the type_array table below + bim_kbalign.
|
---|
| 473 | *
|
---|
| 474 | * When probing for a lot of magics, we handle everything in 1kB buffers so
|
---|
| 475 | * that we don't have to worry about reading each combination of block sizes.
|
---|
| 476 | */
|
---|
| 477 | #define BLKID_BLK_OFFS 64 /* currently reiserfs */
|
---|
| 478 |
|
---|
| 479 | /*
|
---|
| 480 | * Various filesystem magics that we can check for. Note that kboff and
|
---|
| 481 | * sboff are in kilobytes and bytes respectively. All magics are in
|
---|
| 482 | * byte strings so we don't worry about endian issues.
|
---|
| 483 | */
|
---|
| 484 | static const struct blkid_magic type_array[] = {
|
---|
| 485 | /* type kboff sboff len magic probe */
|
---|
| 486 | { "oracleasm", 0, 32, 8, "ORCLDISK", probe_oracleasm },
|
---|
| 487 | { "ntfs", 0, 3, 8, "NTFS ", 0 },
|
---|
| 488 | { "jbd", 1, 0x38, 2, "\123\357", probe_jbd },
|
---|
| 489 | { "ext3", 1, 0x38, 2, "\123\357", probe_ext3 },
|
---|
| 490 | { "ext2", 1, 0x38, 2, "\123\357", probe_ext2 },
|
---|
| 491 | { "reiserfs", 8, 0x34, 8, "ReIsErFs", probe_reiserfs },
|
---|
| 492 | { "reiserfs", 64, 0x34, 9, "ReIsEr2Fs", probe_reiserfs },
|
---|
| 493 | { "reiserfs", 64, 0x34, 9, "ReIsEr3Fs", probe_reiserfs },
|
---|
| 494 | { "reiserfs", 64, 0x34, 8, "ReIsErFs", probe_reiserfs },
|
---|
| 495 | { "reiserfs", 8, 20, 8, "ReIsErFs", probe_reiserfs },
|
---|
| 496 | { "vfat", 0, 0x52, 5, "MSWIN", probe_vfat },
|
---|
| 497 | { "vfat", 0, 0x52, 8, "FAT32 ", probe_vfat },
|
---|
| 498 | { "vfat", 0, 0x36, 5, "MSDOS", probe_msdos },
|
---|
| 499 | { "vfat", 0, 0x36, 8, "FAT16 ", probe_msdos },
|
---|
| 500 | { "vfat", 0, 0x36, 8, "FAT12 ", probe_msdos },
|
---|
| 501 | { "minix", 1, 0x10, 2, "\177\023", 0 },
|
---|
| 502 | { "minix", 1, 0x10, 2, "\217\023", 0 },
|
---|
| 503 | { "minix", 1, 0x10, 2, "\150\044", 0 },
|
---|
| 504 | { "minix", 1, 0x10, 2, "\170\044", 0 },
|
---|
| 505 | { "vxfs", 1, 0, 4, "\365\374\001\245", 0 },
|
---|
| 506 | { "xfs", 0, 0, 4, "XFSB", probe_xfs },
|
---|
| 507 | { "romfs", 0, 0, 8, "-rom1fs-", probe_romfs },
|
---|
| 508 | { "bfs", 0, 0, 4, "\316\372\173\033", 0 },
|
---|
| 509 | { "cramfs", 0, 0, 4, "E=\315\050", probe_cramfs },
|
---|
| 510 | { "qnx4", 0, 4, 6, "QNX4FS", 0 },
|
---|
| 511 | { "udf", 32, 1, 5, "BEA01", probe_udf },
|
---|
| 512 | { "udf", 32, 1, 5, "BOOT2", probe_udf },
|
---|
| 513 | { "udf", 32, 1, 5, "CD001", probe_udf },
|
---|
| 514 | { "udf", 32, 1, 5, "CDW02", probe_udf },
|
---|
| 515 | { "udf", 32, 1, 5, "NSR02", probe_udf },
|
---|
| 516 | { "udf", 32, 1, 5, "NSR03", probe_udf },
|
---|
| 517 | { "udf", 32, 1, 5, "TEA01", probe_udf },
|
---|
| 518 | { "iso9660", 32, 1, 5, "CD001", 0 },
|
---|
| 519 | { "iso9660", 32, 9, 5, "CDROM", 0 },
|
---|
| 520 | { "jfs", 32, 0, 4, "JFS1", probe_jfs },
|
---|
| 521 | { "hfs", 1, 0, 2, "BD", 0 },
|
---|
| 522 | { "ufs", 8, 0x55c, 4, "T\031\001\000", 0 },
|
---|
| 523 | { "hpfs", 8, 0, 4, "I\350\225\371", 0 },
|
---|
| 524 | { "sysv", 0, 0x3f8, 4, "\020~\030\375", 0 },
|
---|
| 525 | { "swap", 0, 0xff6, 10, "SWAP-SPACE", probe_swap0 },
|
---|
| 526 | { "swap", 0, 0xff6, 10, "SWAPSPACE2", probe_swap1 },
|
---|
| 527 | { "swap", 0, 0x1ff6, 10, "SWAP-SPACE", probe_swap0 },
|
---|
| 528 | { "swap", 0, 0x1ff6, 10, "SWAPSPACE2", probe_swap1 },
|
---|
| 529 | { "swap", 0, 0x3ff6, 10, "SWAP-SPACE", probe_swap0 },
|
---|
| 530 | { "swap", 0, 0x3ff6, 10, "SWAPSPACE2", probe_swap1 },
|
---|
| 531 | { "swap", 0, 0x7ff6, 10, "SWAP-SPACE", probe_swap0 },
|
---|
| 532 | { "swap", 0, 0x7ff6, 10, "SWAPSPACE2", probe_swap1 },
|
---|
| 533 | { "swap", 0, 0xfff6, 10, "SWAP-SPACE", probe_swap0 },
|
---|
| 534 | { "swap", 0, 0xfff6, 10, "SWAPSPACE2", probe_swap1 },
|
---|
| 535 | { "ocfs", 0, 8, 9, "OracleCFS", probe_ocfs },
|
---|
| 536 | { "ocfs2", 1, 0, 6, "OCFSV2", probe_ocfs2 },
|
---|
| 537 | { "ocfs2", 2, 0, 6, "OCFSV2", probe_ocfs2 },
|
---|
| 538 | { "ocfs2", 4, 0, 6, "OCFSV2", probe_ocfs2 },
|
---|
| 539 | { "ocfs2", 8, 0, 6, "OCFSV2", probe_ocfs2 },
|
---|
| 540 | { NULL, 0, 0, 0, NULL, NULL }
|
---|
| 541 | };
|
---|
| 542 |
|
---|
| 543 | /*
|
---|
| 544 | * Verify that the data in dev is consistent with what is on the actual
|
---|
| 545 | * block device (using the devname field only). Normally this will be
|
---|
| 546 | * called when finding items in the cache, but for long running processes
|
---|
| 547 | * is also desirable to revalidate an item before use.
|
---|
| 548 | *
|
---|
| 549 | * If we are unable to revalidate the data, we return the old data and
|
---|
| 550 | * do not set the BLKID_BID_FL_VERIFIED flag on it.
|
---|
| 551 | */
|
---|
| 552 | blkid_dev blkid_verify(blkid_cache cache, blkid_dev dev)
|
---|
| 553 | {
|
---|
| 554 | const struct blkid_magic *id;
|
---|
| 555 | unsigned char *bufs[BLKID_BLK_OFFS + 1], *buf;
|
---|
| 556 | const char *type;
|
---|
| 557 | struct stat st;
|
---|
| 558 | time_t diff, now;
|
---|
| 559 | int fd, idx;
|
---|
| 560 |
|
---|
| 561 | if (!dev)
|
---|
| 562 | return NULL;
|
---|
| 563 |
|
---|
| 564 | now = time(0);
|
---|
| 565 | diff = now - dev->bid_time;
|
---|
| 566 |
|
---|
| 567 | if ((now < dev->bid_time) ||
|
---|
| 568 | (diff < BLKID_PROBE_MIN) ||
|
---|
| 569 | (dev->bid_flags & BLKID_BID_FL_VERIFIED &&
|
---|
| 570 | diff < BLKID_PROBE_INTERVAL))
|
---|
| 571 | return dev;
|
---|
| 572 |
|
---|
| 573 | DBG(DEBUG_PROBE,
|
---|
| 574 | printf("need to revalidate %s (time since last check %lu)\n",
|
---|
| 575 | dev->bid_name, diff));
|
---|
| 576 |
|
---|
| 577 | if (((fd = open(dev->bid_name, O_RDONLY)) < 0) ||
|
---|
| 578 | (fstat(fd, &st) < 0)) {
|
---|
| 579 | if (errno == ENXIO || errno == ENODEV || errno == ENOENT) {
|
---|
| 580 | blkid_free_dev(dev);
|
---|
| 581 | return NULL;
|
---|
| 582 | }
|
---|
| 583 | /* We don't have read permission, just return cache data. */
|
---|
| 584 | DBG(DEBUG_PROBE,
|
---|
| 585 | printf("returning unverified data for %s\n",
|
---|
| 586 | dev->bid_name));
|
---|
| 587 | return dev;
|
---|
| 588 | }
|
---|
| 589 |
|
---|
| 590 | memset(bufs, 0, sizeof(bufs));
|
---|
| 591 |
|
---|
| 592 | /*
|
---|
| 593 | * Iterate over the type array. If we already know the type,
|
---|
| 594 | * then try that first. If it doesn't work, then blow away
|
---|
| 595 | * the type information, and try again.
|
---|
| 596 | *
|
---|
| 597 | */
|
---|
| 598 | try_again:
|
---|
| 599 | type = 0;
|
---|
| 600 | if (!dev->bid_type || !strcmp(dev->bid_type, "mdraid")) {
|
---|
| 601 | uuid_t uuid;
|
---|
| 602 |
|
---|
| 603 | if (check_mdraid(fd, uuid) == 0) {
|
---|
| 604 | set_uuid(dev, uuid);
|
---|
| 605 | type = "mdraid";
|
---|
| 606 | goto found_type;
|
---|
| 607 | }
|
---|
| 608 | }
|
---|
| 609 | for (id = type_array; id->bim_type; id++) {
|
---|
| 610 | if (dev->bid_type &&
|
---|
| 611 | strcmp(id->bim_type, dev->bid_type))
|
---|
| 612 | continue;
|
---|
| 613 |
|
---|
| 614 | idx = id->bim_kboff + (id->bim_sboff >> 10);
|
---|
| 615 | if (idx > BLKID_BLK_OFFS || idx < 0)
|
---|
| 616 | continue;
|
---|
| 617 | buf = bufs[idx];
|
---|
| 618 | if (!buf) {
|
---|
| 619 | if (lseek(fd, idx << 10, SEEK_SET) < 0)
|
---|
| 620 | continue;
|
---|
| 621 |
|
---|
| 622 | buf = (unsigned char *)xmalloc(1024);
|
---|
| 623 |
|
---|
| 624 | if (read(fd, buf, 1024) != 1024) {
|
---|
| 625 | free(buf);
|
---|
| 626 | continue;
|
---|
| 627 | }
|
---|
| 628 | bufs[idx] = buf;
|
---|
| 629 | }
|
---|
| 630 |
|
---|
| 631 | if (memcmp(id->bim_magic, buf + (id->bim_sboff&0x3ff),
|
---|
| 632 | id->bim_len))
|
---|
| 633 | continue;
|
---|
| 634 |
|
---|
| 635 | if ((id->bim_probe == NULL) ||
|
---|
| 636 | (id->bim_probe(fd, cache, dev, id, buf) == 0)) {
|
---|
| 637 | type = id->bim_type;
|
---|
| 638 | goto found_type;
|
---|
| 639 | }
|
---|
| 640 | }
|
---|
| 641 |
|
---|
| 642 | if (!id->bim_type && dev->bid_type) {
|
---|
| 643 | /*
|
---|
| 644 | * Zap the device filesystem type and try again
|
---|
| 645 | */
|
---|
| 646 | blkid_set_tag(dev, "TYPE", 0, 0);
|
---|
| 647 | blkid_set_tag(dev, "SEC_TYPE", 0, 0);
|
---|
| 648 | blkid_set_tag(dev, "LABEL", 0, 0);
|
---|
| 649 | blkid_set_tag(dev, "UUID", 0, 0);
|
---|
| 650 | goto try_again;
|
---|
| 651 | }
|
---|
| 652 |
|
---|
| 653 | if (!dev->bid_type) {
|
---|
| 654 | blkid_free_dev(dev);
|
---|
| 655 | return NULL;
|
---|
| 656 | }
|
---|
| 657 |
|
---|
| 658 | found_type:
|
---|
| 659 | if (dev && type) {
|
---|
| 660 | dev->bid_devno = st.st_rdev;
|
---|
| 661 | dev->bid_time = time(0);
|
---|
| 662 | dev->bid_flags |= BLKID_BID_FL_VERIFIED;
|
---|
| 663 | cache->bic_flags |= BLKID_BIC_FL_CHANGED;
|
---|
| 664 |
|
---|
| 665 | blkid_set_tag(dev, "TYPE", type, 0);
|
---|
| 666 |
|
---|
| 667 | DBG(DEBUG_PROBE, printf("%s: devno 0x%04llx, type %s\n",
|
---|
| 668 | dev->bid_name, st.st_rdev, type));
|
---|
| 669 | }
|
---|
| 670 |
|
---|
| 671 | close(fd);
|
---|
| 672 |
|
---|
| 673 | return dev;
|
---|
| 674 | }
|
---|
| 675 |
|
---|
| 676 | int blkid_known_fstype(const char *fstype)
|
---|
| 677 | {
|
---|
| 678 | const struct blkid_magic *id;
|
---|
| 679 |
|
---|
| 680 | for (id = type_array; id->bim_type; id++) {
|
---|
| 681 | if (strcmp(fstype, id->bim_type) == 0)
|
---|
| 682 | return 1;
|
---|
| 683 | }
|
---|
| 684 | return 0;
|
---|
| 685 | }
|
---|
| 686 |
|
---|
| 687 | #ifdef TEST_PROGRAM
|
---|
| 688 | int main(int argc, char **argv)
|
---|
| 689 | {
|
---|
| 690 | blkid_dev dev;
|
---|
| 691 | blkid_cache cache;
|
---|
| 692 | int ret;
|
---|
| 693 |
|
---|
| 694 | blkid_debug_mask = DEBUG_ALL;
|
---|
| 695 | if (argc != 2) {
|
---|
| 696 | fprintf(stderr, "Usage: %s device\n"
|
---|
| 697 | "Probe a single device to determine type\n", argv[0]);
|
---|
| 698 | exit(1);
|
---|
| 699 | }
|
---|
| 700 | if ((ret = blkid_get_cache(&cache, bb_dev_null)) != 0) {
|
---|
| 701 | fprintf(stderr, "%s: error creating cache (%d)\n",
|
---|
| 702 | argv[0], ret);
|
---|
| 703 | exit(1);
|
---|
| 704 | }
|
---|
| 705 | dev = blkid_get_dev(cache, argv[1], BLKID_DEV_NORMAL);
|
---|
| 706 | if (!dev) {
|
---|
| 707 | printf("%s: %s has an unsupported type\n", argv[0], argv[1]);
|
---|
| 708 | return (1);
|
---|
| 709 | }
|
---|
| 710 | printf("%s is type %s\n", argv[1], dev->bid_type ?
|
---|
| 711 | dev->bid_type : "(null)");
|
---|
| 712 | if (dev->bid_label)
|
---|
| 713 | printf("\tlabel is '%s'\n", dev->bid_label);
|
---|
| 714 | if (dev->bid_uuid)
|
---|
| 715 | printf("\tuuid is %s\n", dev->bid_uuid);
|
---|
| 716 |
|
---|
| 717 | blkid_free_dev(dev);
|
---|
| 718 | return (0);
|
---|
| 719 | }
|
---|
| 720 | #endif
|
---|