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authorbigbiff bigbiff <bigbiff@teamw.in>2013-02-23 02:55:50 +0100
committerbigbiff bigbiff <bigbiff@teamw.in>2013-02-25 15:06:46 +0100
commite60683a0d553b6488c564863f4e48954944fb0f8 (patch)
tree9364f97cb88b7c1359f5f06dfb32150a78168c31 /libblkid/lvm2.c
parentFix building of updater for 4.2 environment (diff)
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Diffstat (limited to 'libblkid/lvm2.c')
-rw-r--r--libblkid/lvm2.c228
1 files changed, 228 insertions, 0 deletions
diff --git a/libblkid/lvm2.c b/libblkid/lvm2.c
new file mode 100644
index 000000000..0afc77322
--- /dev/null
+++ b/libblkid/lvm2.c
@@ -0,0 +1,228 @@
+/*
+ * Copyright (C) 1999 by Andries Brouwer
+ * Copyright (C) 1999, 2000, 2003 by Theodore Ts'o
+ * Copyright (C) 2001 by Andreas Dilger
+ * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
+ * Copyright (C) 2008 Karel Zak <kzak@redhat.com>
+ * Copyright (C) 2012 Milan Broz <mbroz@redhat.com>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdint.h>
+
+#include "superblocks.h"
+
+#define LVM1_ID_LEN 128
+#define LVM2_ID_LEN 32
+
+struct lvm2_pv_label_header {
+ /* label_header */
+ uint8_t id[8]; /* LABELONE */
+ uint64_t sector_xl; /* Sector number of this label */
+ uint32_t crc_xl; /* From next field to end of sector */
+ uint32_t offset_xl; /* Offset from start of struct to contents */
+ uint8_t type[8]; /* LVM2 001 */
+ /* pv_header */
+ uint8_t pv_uuid[LVM2_ID_LEN];
+} __attribute__ ((packed));
+
+struct lvm1_pv_label_header {
+ uint8_t id[2]; /* HM */
+ uint16_t version; /* version 1 or 2 */
+ uint32_t _notused[10]; /* lvm1 internals */
+ uint8_t pv_uuid[LVM1_ID_LEN];
+} __attribute__ ((packed));
+
+#define LVM2_LABEL_SIZE 512
+static unsigned int lvm2_calc_crc(const void *buf, unsigned int size)
+{
+ static const unsigned int crctab[] = {
+ 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
+ 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
+ 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
+ 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
+ };
+ unsigned int i, crc = 0xf597a6cf;
+ const uint8_t *data = (const uint8_t *) buf;
+
+ for (i = 0; i < size; i++) {
+ crc ^= *data++;
+ crc = (crc >> 4) ^ crctab[crc & 0xf];
+ crc = (crc >> 4) ^ crctab[crc & 0xf];
+ }
+ return crc;
+}
+
+/* Length of real UUID is always LVM2_ID_LEN */
+static void format_lvm_uuid(char *dst_uuid, char *src_uuid)
+{
+ unsigned int i, b;
+
+ for (i = 0, b = 1; i < LVM2_ID_LEN; i++, b <<= 1) {
+ if (b & 0x4444440)
+ *dst_uuid++ = '-';
+ *dst_uuid++ = *src_uuid++;
+ }
+ *dst_uuid = '\0';
+}
+
+static int probe_lvm2(blkid_probe pr, const struct blkid_idmag *mag)
+{
+ int sector = mag->kboff << 1;
+ struct lvm2_pv_label_header *label;
+ char uuid[LVM2_ID_LEN + 7];
+ unsigned char *buf;
+
+ buf = blkid_probe_get_buffer(pr,
+ mag->kboff << 10,
+ 512 + sizeof(struct lvm2_pv_label_header));
+ if (!buf)
+ return -1;
+
+ /* buf is at 0k or 1k offset; find label inside */
+ if (memcmp(buf, "LABELONE", 8) == 0) {
+ label = (struct lvm2_pv_label_header *) buf;
+ } else if (memcmp(buf + 512, "LABELONE", 8) == 0) {
+ label = (struct lvm2_pv_label_header *)(buf + 512);
+ sector++;
+ } else {
+ return 1;
+ }
+
+ if (le64_to_cpu(label->sector_xl) != (unsigned) sector)
+ return 1;
+
+ if (lvm2_calc_crc(&label->offset_xl, LVM2_LABEL_SIZE -
+ ((char *) &label->offset_xl - (char *) label)) !=
+ le32_to_cpu(label->crc_xl)) {
+ DBG(DEBUG_PROBE,
+ printf("LVM2: label checksum incorrect at sector %d\n",
+ sector));
+ return 1;
+ }
+
+ format_lvm_uuid(uuid, (char *) label->pv_uuid);
+ blkid_probe_sprintf_uuid(pr, label->pv_uuid, sizeof(label->pv_uuid),
+ "%s", uuid);
+
+ /* the mag->magic is the same string as label->type,
+ * but zero terminated */
+ blkid_probe_set_version(pr, mag->magic);
+
+ /* LVM (pvcreate) wipes begin of the device -- let's remember this
+ * to resolve conflicts bettween LVM and partition tables, ...
+ */
+ blkid_probe_set_wiper(pr, 0, 8 * 1024);
+
+ return 0;
+}
+
+static int probe_lvm1(blkid_probe pr, const struct blkid_idmag *mag)
+{
+ struct lvm1_pv_label_header *label;
+ char uuid[LVM2_ID_LEN + 7];
+ unsigned int version;
+
+ label = blkid_probe_get_sb(pr, mag, struct lvm1_pv_label_header);
+ if (!label)
+ return -1;
+
+ version = le16_to_cpu(label->version);
+ if (version != 1 && version != 2)
+ return 1;
+
+ format_lvm_uuid(uuid, (char *) label->pv_uuid);
+ blkid_probe_sprintf_uuid(pr, label->pv_uuid, sizeof(label->pv_uuid),
+ "%s", uuid);
+
+ return 0;
+}
+
+struct verity_sb {
+ uint8_t signature[8]; /* "verity\0\0" */
+ uint32_t version; /* superblock version */
+ uint32_t hash_type; /* 0 - Chrome OS, 1 - normal */
+ uint8_t uuid[16]; /* UUID of hash device */
+ uint8_t algorithm[32];/* hash algorithm name */
+ uint32_t data_block_size; /* data block in bytes */
+ uint32_t hash_block_size; /* hash block in bytes */
+ uint64_t data_blocks; /* number of data blocks */
+ uint16_t salt_size; /* salt size */
+ uint8_t _pad1[6];
+ uint8_t salt[256]; /* salt */
+ uint8_t _pad2[168];
+} __attribute__((packed));
+
+static int probe_verity(blkid_probe pr, const struct blkid_idmag *mag)
+{
+ struct verity_sb *sb;
+ unsigned int version;
+
+ sb = blkid_probe_get_sb(pr, mag, struct verity_sb);
+ if (sb == NULL)
+ return -1;
+
+ version = le32_to_cpu(sb->version);
+ if (version != 1)
+ return 1;
+
+ blkid_probe_set_uuid(pr, sb->uuid);
+ blkid_probe_sprintf_version(pr, "%u", version);
+ return 0;
+}
+
+/* NOTE: the original libblkid uses "lvm2pv" as a name */
+const struct blkid_idinfo lvm2_idinfo =
+{
+ .name = "LVM2_member",
+ .usage = BLKID_USAGE_RAID,
+ .probefunc = probe_lvm2,
+ .magics =
+ {
+ { .magic = "LVM2 001", .len = 8, .sboff = 0x218 },
+ { .magic = "LVM2 001", .len = 8, .sboff = 0x018 },
+ { .magic = "LVM2 001", .len = 8, .kboff = 1, .sboff = 0x018 },
+ { .magic = "LVM2 001", .len = 8, .kboff = 1, .sboff = 0x218 },
+ { NULL }
+ }
+};
+
+const struct blkid_idinfo lvm1_idinfo =
+{
+ .name = "LVM1_member",
+ .usage = BLKID_USAGE_RAID,
+ .probefunc = probe_lvm1,
+ .magics =
+ {
+ { .magic = "HM", .len = 2 },
+ { NULL }
+ }
+};
+
+const struct blkid_idinfo snapcow_idinfo =
+{
+ .name = "DM_snapshot_cow",
+ .usage = BLKID_USAGE_OTHER,
+ .magics =
+ {
+ { .magic = "SnAp", .len = 4 },
+ { NULL }
+ }
+};
+
+const struct blkid_idinfo verity_hash_idinfo =
+{
+ .name = "DM_verity_hash",
+ .usage = BLKID_USAGE_CRYPTO,
+ .probefunc = probe_verity,
+ .magics =
+ {
+ { .magic = "verity\0\0", .len = 8 },
+ { NULL }
+ }
+};