2 * volume_id - reads filesystem label and uuid
4 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #include "volume_id_internal.h"
23 struct msdos_partition_entry {
36 #define MSDOS_PARTTABLE_OFFSET 0x1be
37 #define MSDOS_SIG_OFF 0x1fe
39 #define DOS_EXTENDED_PARTITION 0x05
40 #define LINUX_EXTENDED_PARTITION 0x85
41 #define WIN98_EXTENDED_PARTITION 0x0f
42 #define LINUX_RAID_PARTITION 0xfd
43 #define is_extended(type) \
44 (type == DOS_EXTENDED_PARTITION || \
45 type == WIN98_EXTENDED_PARTITION || \
46 type == LINUX_EXTENDED_PARTITION)
47 #define is_raid(type) \
48 (type == LINUX_RAID_PARTITION)
50 int FAST_FUNC volume_id_probe_msdos_part_table(struct volume_id *id, uint64_t off)
56 uint64_t extended = 0;
61 struct msdos_partition_entry *part;
62 struct volume_id_partition *p;
64 dbg("probing at offset 0x%llx", (unsigned long long) off);
66 buf = volume_id_get_buffer(id, off, 0x200);
70 if (buf[MSDOS_SIG_OFF] != 0x55 || buf[MSDOS_SIG_OFF + 1] != 0xaa)
73 /* check flags on all entries for a valid partition table */
74 part = (struct msdos_partition_entry*) &buf[MSDOS_PARTTABLE_OFFSET];
75 for (i = 0; i < 4; i++) {
76 if (part[i].boot_ind != 0
77 && part[i].boot_ind != 0x80
82 if (part[i].nr_sects != 0)
88 if (id->partitions != NULL)
90 id->partitions = xzalloc(VOLUME_ID_PARTITIONS_MAX *
91 sizeof(struct volume_id_partition));
93 for (i = 0; i < 4; i++) {
94 poff = (uint64_t) le32_to_cpu(part[i].start_sect) * BSIZE;
95 plen = (uint64_t) le32_to_cpu(part[i].nr_sects) * BSIZE;
100 p = &id->partitions[i];
102 // p->pt_type_raw = part[i].sys_ind;
104 if (is_extended(part[i].sys_ind)) {
105 dbg("found extended partition at 0x%llx", (unsigned long long) poff);
106 // volume_id_set_usage_part(p, VOLUME_ID_PARTITIONTABLE);
107 // p->type = "msdos_extended_partition";
109 extended = off + poff;
111 dbg("found 0x%x data partition at 0x%llx, len 0x%llx",
112 part[i].sys_ind, (unsigned long long) poff, (unsigned long long) plen);
114 // if (is_raid(part[i].sys_ind))
115 // volume_id_set_usage_part(p, VOLUME_ID_RAID);
117 // volume_id_set_usage_part(p, VOLUME_ID_UNPROBED);
120 // p->pt_off = off + poff;
122 id->partition_count = i+1;
129 /* follow extended partition chain and add data partitions */
132 dbg("extended chain limit reached");
136 buf = volume_id_get_buffer(id, current, 0x200);
140 part = (struct msdos_partition_entry*) &buf[MSDOS_PARTTABLE_OFFSET];
142 if (buf[MSDOS_SIG_OFF] != 0x55 || buf[MSDOS_SIG_OFF + 1] != 0xaa)
147 for (i = 0; i < 4; i++) {
148 poff = (uint64_t) le32_to_cpu(part[i].start_sect) * BSIZE;
149 plen = (uint64_t) le32_to_cpu(part[i].nr_sects) * BSIZE;
154 if (is_extended(part[i].sys_ind)) {
155 dbg("found extended partition at 0x%llx", (unsigned long long) poff);
157 next = extended + poff;
159 dbg("found 0x%x data partition at 0x%llx, len 0x%llx",
160 part[i].sys_ind, (unsigned long long) poff, (unsigned long long) plen);
162 /* we always start at the 5th entry */
163 // while (id->partition_count < 4)
164 // volume_id_set_usage_part(&id->partitions[id->partition_count++], VOLUME_ID_UNUSED);
165 if (id->partition_count < 4)
166 id->partition_count = 4;
168 p = &id->partitions[id->partition_count];
170 // if (is_raid(part[i].sys_ind))
171 // volume_id_set_usage_part(p, VOLUME_ID_RAID);
173 // volume_id_set_usage_part(p, VOLUME_ID_UNPROBED);
175 // p->pt_off = current + poff;
177 id->partition_count++;
179 // p->pt_type_raw = part[i].sys_ind;
181 if (id->partition_count >= VOLUME_ID_PARTITIONS_MAX) {
182 dbg("too many partitions");
191 // volume_id_set_usage(id, VOLUME_ID_PARTITIONTABLE);
192 // id->type = "msdos_partition_table";