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 //kbuild:### lib-$(CONFIG_FEATURE_VOLUMEID_MSDOS) += msdos.o
24 //config:### config FEATURE_VOLUMEID_MSDOS
25 //config:### bool "msdos filesystem"
26 //config:### default y
27 //config:### depends on VOLUMEID
32 #include "volume_id_internal.h"
34 struct msdos_partition_entry
{
47 #define MSDOS_PARTTABLE_OFFSET 0x1be
48 #define MSDOS_SIG_OFF 0x1fe
50 #define DOS_EXTENDED_PARTITION 0x05
51 #define LINUX_EXTENDED_PARTITION 0x85
52 #define WIN98_EXTENDED_PARTITION 0x0f
53 #define LINUX_RAID_PARTITION 0xfd
54 #define is_extended(type) \
55 (type == DOS_EXTENDED_PARTITION || \
56 type == WIN98_EXTENDED_PARTITION || \
57 type == LINUX_EXTENDED_PARTITION)
58 #define is_raid(type) \
59 (type == LINUX_RAID_PARTITION)
61 int FAST_FUNC
volume_id_probe_msdos_part_table(struct volume_id
*id
, uint64_t off
)
67 uint64_t extended
= 0;
72 struct msdos_partition_entry
*part
;
73 struct volume_id_partition
*p
;
75 dbg("probing at offset 0x%llx", (unsigned long long) off
);
77 buf
= volume_id_get_buffer(id
, off
, 0x200);
81 if (buf
[MSDOS_SIG_OFF
] != 0x55 || buf
[MSDOS_SIG_OFF
+ 1] != 0xaa)
84 /* check flags on all entries for a valid partition table */
85 part
= (struct msdos_partition_entry
*) &buf
[MSDOS_PARTTABLE_OFFSET
];
86 for (i
= 0; i
< 4; i
++) {
87 if (part
[i
].boot_ind
!= 0
88 && part
[i
].boot_ind
!= 0x80
93 if (part
[i
].nr_sects
!= 0)
99 if (id
->partitions
!= NULL
)
100 free(id
->partitions
);
101 id
->partitions
= xzalloc(VOLUME_ID_PARTITIONS_MAX
*
102 sizeof(struct volume_id_partition
));
104 for (i
= 0; i
< 4; i
++) {
105 poff
= (uint64_t) le32_to_cpu(part
[i
].start_sect
) * BSIZE
;
106 plen
= (uint64_t) le32_to_cpu(part
[i
].nr_sects
) * BSIZE
;
111 p
= &id
->partitions
[i
];
113 // p->pt_type_raw = part[i].sys_ind;
115 if (is_extended(part
[i
].sys_ind
)) {
116 dbg("found extended partition at 0x%llx", (unsigned long long) poff
);
117 // volume_id_set_usage_part(p, VOLUME_ID_PARTITIONTABLE);
118 // p->type = "msdos_extended_partition";
120 extended
= off
+ poff
;
122 dbg("found 0x%x data partition at 0x%llx, len 0x%llx",
123 part
[i
].sys_ind
, (unsigned long long) poff
, (unsigned long long) plen
);
125 // if (is_raid(part[i].sys_ind))
126 // volume_id_set_usage_part(p, VOLUME_ID_RAID);
128 // volume_id_set_usage_part(p, VOLUME_ID_UNPROBED);
131 // p->pt_off = off + poff;
133 id
->partition_count
= i
+1;
140 /* follow extended partition chain and add data partitions */
143 dbg("extended chain limit reached");
147 buf
= volume_id_get_buffer(id
, current
, 0x200);
151 part
= (struct msdos_partition_entry
*) &buf
[MSDOS_PARTTABLE_OFFSET
];
153 if (buf
[MSDOS_SIG_OFF
] != 0x55 || buf
[MSDOS_SIG_OFF
+ 1] != 0xaa)
158 for (i
= 0; i
< 4; i
++) {
159 poff
= (uint64_t) le32_to_cpu(part
[i
].start_sect
) * BSIZE
;
160 plen
= (uint64_t) le32_to_cpu(part
[i
].nr_sects
) * BSIZE
;
165 if (is_extended(part
[i
].sys_ind
)) {
166 dbg("found extended partition at 0x%llx", (unsigned long long) poff
);
168 next
= extended
+ poff
;
170 dbg("found 0x%x data partition at 0x%llx, len 0x%llx",
171 part
[i
].sys_ind
, (unsigned long long) poff
, (unsigned long long) plen
);
173 /* we always start at the 5th entry */
174 // while (id->partition_count < 4)
175 // volume_id_set_usage_part(&id->partitions[id->partition_count++], VOLUME_ID_UNUSED);
176 if (id
->partition_count
< 4)
177 id
->partition_count
= 4;
179 // p = &id->partitions[id->partition_count];
181 // if (is_raid(part[i].sys_ind))
182 // volume_id_set_usage_part(p, VOLUME_ID_RAID);
184 // volume_id_set_usage_part(p, VOLUME_ID_UNPROBED);
186 // p->pt_off = current + poff;
188 id
->partition_count
++;
190 // p->pt_type_raw = part[i].sys_ind;
192 if (id
->partition_count
>= VOLUME_ID_PARTITIONS_MAX
) {
193 dbg("too many partitions");
202 // volume_id_set_usage(id, VOLUME_ID_PARTITIONTABLE);
203 // id->type = "msdos_partition_table";