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