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

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
new file mode 100644
index 0000000..097ee67
--- /dev/null
+++ 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;
+}