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Diffstat (limited to 'util-linux/volume_id/unused_msdos.c')
-rw-r--r--util-linux/volume_id/unused_msdos.c193
1 files changed, 193 insertions, 0 deletions
diff --git a/util-linux/volume_id/unused_msdos.c b/util-linux/volume_id/unused_msdos.c
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index 0000000..097ee67
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+++ b/util-linux/volume_id/unused_msdos.c
@@ -0,0 +1,193 @@
+/*
+ * 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;
+}