busybox/util-linux/volume_id/unused_msdos.c
Denis Vlasenko d25c33f186 volume_id: disable detection routines which are not setting label and uuid anyway
function                                             old     new   delta
static.warn                                            1       -      -1
static.drive_name_string                              14      12      -2
static.offsets                                         8       -      -8
static.sectors                                        10       -     -10
fs2                                                   60      48     -12
raid2                                                 16       -     -16
uuidcache_init                                       704     677     -27
raid1                                                 32       -     -32
volume_id_probe_all                                  198     158     -40
volume_id_probe_lvm1                                  58       -     -58
volume_id_probe_highpoint_37x_raid                    63       -     -63
volume_id_probe_hpfs                                  67       -     -67
volume_id_probe_minix                                 74       -     -74
volume_id_probe_lvm2                                  78       -     -78
volume_id_probe_silicon_medley_raid                   97       -     -97
volume_id_probe_via_raid                             101       -    -101
volume_id_probe_highpoint_45x_raid                   104       -    -104
volume_id_probe_nvidia_raid                          108       -    -108
volume_id_probe_lsi_mega_raid                        108       -    -108
volume_id_probe_intel_software_raid                  108       -    -108
volume_id_probe_ufs                                  126       -    -126
volume_id_probe_promise_fasttrack_raid               144       -    -144
------------------------------------------------------------------------------
(add/remove: 0/18 grow/shrink: 0/4 up/down: 0/-1384)        Total: -1384 bytes
   text    data     bss     dec     hex filename
 794244     662    7420  802326   c3e16 busybox_old
 792698     662    7420  800780   c380c busybox_unstripped
2008-03-17 09:25:05 +00:00

194 lines
5.1 KiB
C

/*
* volume_id - reads filesystem label and uuid
*
* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "volume_id_internal.h"
struct msdos_partition_entry {
uint8_t boot_ind;
uint8_t head;
uint8_t sector;
uint8_t cyl;
uint8_t sys_ind;
uint8_t end_head;
uint8_t end_sector;
uint8_t end_cyl;
uint32_t start_sect;
uint32_t nr_sects;
} __attribute__((packed));
#define MSDOS_PARTTABLE_OFFSET 0x1be
#define MSDOS_SIG_OFF 0x1fe
#define BSIZE 0x200
#define DOS_EXTENDED_PARTITION 0x05
#define LINUX_EXTENDED_PARTITION 0x85
#define WIN98_EXTENDED_PARTITION 0x0f
#define LINUX_RAID_PARTITION 0xfd
#define is_extended(type) \
(type == DOS_EXTENDED_PARTITION || \
type == WIN98_EXTENDED_PARTITION || \
type == LINUX_EXTENDED_PARTITION)
#define is_raid(type) \
(type == LINUX_RAID_PARTITION)
int volume_id_probe_msdos_part_table(struct volume_id *id, uint64_t off)
{
const uint8_t *buf;
int i;
uint64_t poff;
uint64_t plen;
uint64_t extended = 0;
uint64_t current;
uint64_t next;
int limit;
int empty = 1;
struct msdos_partition_entry *part;
struct volume_id_partition *p;
dbg("probing at offset 0x%llx", (unsigned long long) off);
buf = volume_id_get_buffer(id, off, 0x200);
if (buf == NULL)
return -1;
if (buf[MSDOS_SIG_OFF] != 0x55 || buf[MSDOS_SIG_OFF + 1] != 0xaa)
return -1;
/* check flags on all entries for a valid partition table */
part = (struct msdos_partition_entry*) &buf[MSDOS_PARTTABLE_OFFSET];
for (i = 0; i < 4; i++) {
if (part[i].boot_ind != 0 &&
part[i].boot_ind != 0x80)
return -1;
if (part[i].nr_sects != 0)
empty = 0;
}
if (empty == 1)
return -1;
if (id->partitions != NULL)
free(id->partitions);
id->partitions = xzalloc(VOLUME_ID_PARTITIONS_MAX *
sizeof(struct volume_id_partition));
for (i = 0; i < 4; i++) {
poff = (uint64_t) le32_to_cpu(part[i].start_sect) * BSIZE;
plen = (uint64_t) le32_to_cpu(part[i].nr_sects) * BSIZE;
if (plen == 0)
continue;
p = &id->partitions[i];
// p->pt_type_raw = part[i].sys_ind;
if (is_extended(part[i].sys_ind)) {
dbg("found extended partition at 0x%llx", (unsigned long long) poff);
// volume_id_set_usage_part(p, VOLUME_ID_PARTITIONTABLE);
// p->type = "msdos_extended_partition";
if (extended == 0)
extended = off + poff;
} else {
dbg("found 0x%x data partition at 0x%llx, len 0x%llx",
part[i].sys_ind, (unsigned long long) poff, (unsigned long long) plen);
// if (is_raid(part[i].sys_ind))
// volume_id_set_usage_part(p, VOLUME_ID_RAID);
// else
// volume_id_set_usage_part(p, VOLUME_ID_UNPROBED);
}
// p->pt_off = off + poff;
// p->pt_len = plen;
id->partition_count = i+1;
}
next = extended;
current = extended;
limit = 50;
/* follow extended partition chain and add data partitions */
while (next != 0) {
if (limit-- == 0) {
dbg("extended chain limit reached");
break;
}
buf = volume_id_get_buffer(id, current, 0x200);
if (buf == NULL)
break;
part = (struct msdos_partition_entry*) &buf[MSDOS_PARTTABLE_OFFSET];
if (buf[MSDOS_SIG_OFF] != 0x55 || buf[MSDOS_SIG_OFF + 1] != 0xaa)
break;
next = 0;
for (i = 0; i < 4; i++) {
poff = (uint64_t) le32_to_cpu(part[i].start_sect) * BSIZE;
plen = (uint64_t) le32_to_cpu(part[i].nr_sects) * BSIZE;
if (plen == 0)
continue;
if (is_extended(part[i].sys_ind)) {
dbg("found extended partition at 0x%llx", (unsigned long long) poff);
if (next == 0)
next = extended + poff;
} else {
dbg("found 0x%x data partition at 0x%llx, len 0x%llx",
part[i].sys_ind, (unsigned long long) poff, (unsigned long long) plen);
/* we always start at the 5th entry */
// while (id->partition_count < 4)
// volume_id_set_usage_part(&id->partitions[id->partition_count++], VOLUME_ID_UNUSED);
if (id->partition_count < 4)
id->partition_count = 4;
p = &id->partitions[id->partition_count];
// if (is_raid(part[i].sys_ind))
// volume_id_set_usage_part(p, VOLUME_ID_RAID);
// else
// volume_id_set_usage_part(p, VOLUME_ID_UNPROBED);
// p->pt_off = current + poff;
// p->pt_len = plen;
id->partition_count++;
// p->pt_type_raw = part[i].sys_ind;
if (id->partition_count >= VOLUME_ID_PARTITIONS_MAX) {
dbg("too many partitions");
next = 0;
}
}
}
current = next;
}
// volume_id_set_usage(id, VOLUME_ID_PARTITIONTABLE);
// id->type = "msdos_partition_table";
return 0;
}