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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/drbd.c
parentFix building of updater for 4.2 environment (diff)
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Diffstat (limited to 'libblkid/drbd.c')
-rw-r--r--libblkid/drbd.c117
1 files changed, 117 insertions, 0 deletions
diff --git a/libblkid/drbd.c b/libblkid/drbd.c
new file mode 100644
index 000000000..43e544e89
--- /dev/null
+++ b/libblkid/drbd.c
@@ -0,0 +1,117 @@
+/*
+ * Copyright (C) 2009 by Bastian Friedrich <bastian.friedrich@collax.com>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ *
+ * defines, structs taken from drbd source; file names represent drbd source
+ * files.
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <ctype.h>
+#include <inttypes.h>
+#include <stddef.h>
+
+#include "superblocks.h"
+
+/*
+ * drbd/linux/drbd.h
+ */
+#define DRBD_MAGIC 0x83740267
+
+/*
+ * user/drbdmeta.c
+ * We only support v08 for now
+ */
+#define DRBD_MD_MAGIC_08 (DRBD_MAGIC+4)
+#define DRBD_MD_MAGIC_84_UNCLEAN (DRBD_MAGIC+5)
+
+/*
+ * drbd/linux/drbd.h
+ */
+enum drbd_uuid_index {
+ UI_CURRENT,
+ UI_BITMAP,
+ UI_HISTORY_START,
+ UI_HISTORY_END,
+ UI_SIZE, /* nl-packet: number of dirty bits */
+ UI_FLAGS, /* nl-packet: flags */
+ UI_EXTENDED_SIZE /* Everything. */
+};
+
+/*
+ * user/drbdmeta.c
+ * Minor modifications wrt. types
+ */
+struct md_on_disk_08 {
+ uint64_t la_sect; /* last agreed size. */
+ uint64_t uuid[UI_SIZE]; /* UUIDs */
+ uint64_t device_uuid;
+ uint64_t reserved_u64_1;
+ uint32_t flags;
+ uint32_t magic;
+ uint32_t md_size_sect;
+ int32_t al_offset; /* signed sector offset to this block */
+ uint32_t al_nr_extents; /* important for restoring the AL */
+ int32_t bm_offset; /* signed sector offset to the bitmap, from here */
+ uint32_t bm_bytes_per_bit;
+ uint32_t reserved_u32[4];
+
+ char reserved[8 * 512 - (8*(UI_SIZE+3)+4*11)];
+};
+
+
+static int probe_drbd(blkid_probe pr,
+ const struct blkid_idmag *mag __attribute__((__unused__)))
+{
+ struct md_on_disk_08 *md;
+ off_t off;
+
+ off = pr->size - sizeof(*md);
+
+ /* Small devices cannot be drbd (?) */
+ if (pr->size < 0x10000)
+ return -1;
+
+ md = (struct md_on_disk_08 *)
+ blkid_probe_get_buffer(pr,
+ off,
+ sizeof(struct md_on_disk_08));
+ if (!md)
+ return -1;
+
+ if (be32_to_cpu(md->magic) != DRBD_MD_MAGIC_08 &&
+ be32_to_cpu(md->magic) != DRBD_MD_MAGIC_84_UNCLEAN)
+ return -1;
+
+ /*
+ * DRBD does not have "real" uuids; the following resembles DRBD's
+ * notion of uuids (64 bit, see struct above)
+ */
+ blkid_probe_sprintf_uuid(pr,
+ (unsigned char *) &md->device_uuid, sizeof(md->device_uuid),
+ "%" PRIx64, be64_to_cpu(md->device_uuid));
+
+ blkid_probe_set_version(pr, "v08");
+
+ if (blkid_probe_set_magic(pr,
+ off + offsetof(struct md_on_disk_08, magic),
+ sizeof(md->magic),
+ (unsigned char *) &md->magic))
+ return -1;
+
+ return 0;
+}
+
+const struct blkid_idinfo drbd_idinfo =
+{
+ .name = "drbd",
+ .usage = BLKID_USAGE_RAID,
+ .probefunc = probe_drbd,
+ .magics = BLKID_NONE_MAGIC
+};
+