libblkid: added drbdmanage control volume detection.

Signed-off-by: Karel Zak <kzak@redhat.com>

4 files changed, 95 insertions, 0 deletions

diff --git a/libblkid/src/Makemodule.am b/libblkid/src/Makemodule.am
index 7682958fe..52d0b0a7b 100644
--- a/libblkid/src/Makemodule.am
+++ b/libblkid/src/Makemodule.am
@@ -52,6 +52,7 @@ libblkid_la_SOURCES = \
 	libblkid/src/superblocks/ddf_raid.c \
 	libblkid/src/superblocks/drbd.c \
 	libblkid/src/superblocks/drbdproxy_datalog.c \
+	libblkid/src/superblocks/drbdmanage.c \
 	libblkid/src/superblocks/exfat.c \
 	libblkid/src/superblocks/ext.c \
 	libblkid/src/superblocks/f2fs.c \
diff --git a/libblkid/src/superblocks/drbdmanage.c b/libblkid/src/superblocks/drbdmanage.c
new file mode 100644
index 000000000..ee841423f
--- /dev/null
+++ b/libblkid/src/superblocks/drbdmanage.c
@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2015 by Philipp Marek <philipp.marek@linbit.com>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ *
+ * DRBD is a blocklevel replication solution in the Linux kernel,
+ * upstream since 2.6.33. (See http://drbd.linbit.com/)
+ * DRBDmanage is a configuration frontend that assists in
+ * creating/deleting/modifying DRBD resources across multiple machines
+ * (a DRBDmanage "cluster"); this file detects its control volume,
+ * which is replicated (via DRBD 9) on some of the nodes.
+ */
+#include <endian.h>
+#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"
+
+struct drbdmanage_hdr {
+	unsigned char magic[11];
+	unsigned char uuid[32];
+	unsigned char lf;
+} __attribute__ ((packed));
+
+struct drbdmanage_pers {
+	char magic[4];
+	uint32_t version_le;
+} __attribute__ ((packed));
+
+
+const char persistence_magic[4] = "\x1a\xdb\x98\xa2";
+
+
+static int probe_drbdmanage(blkid_probe pr,
+		const struct blkid_idmag *mag __attribute__((__unused__)))
+{
+	struct drbdmanage_hdr *hdr;
+	unsigned char *cp;
+	struct drbdmanage_pers *prs;
+	char persistence_version[10];
+	int l;
+
+
+	hdr = (struct drbdmanage_hdr*)
+		blkid_probe_get_buffer(pr, 0, sizeof(*hdr));
+	if (!hdr)
+		return errno ? -errno : 1;
+
+	for(cp=hdr->uuid; cp<&hdr->lf; cp++)
+		if (!isxdigit(*cp))
+			return 1;
+	if (hdr->lf != '\n')
+		return 1;
+
+	if (blkid_probe_set_id_label(pr, "UUID",
+				hdr->uuid, sizeof(hdr->uuid)))
+		return errno ? -errno : 1;
+
+	prs = (struct drbdmanage_pers*)
+		blkid_probe_get_buffer(pr, 0x1000, sizeof(*prs));
+	if (!prs)
+		return errno ? -errno : 1;
+
+	if (memcmp(prs->magic, persistence_magic, sizeof(prs->magic)) == 0) {
+		l = sprintf(persistence_version, "%d",
+				be32toh(prs->version_le));
+		blkid_probe_set_value(pr, "PERSISTENCE_VERSION",
+				persistence_version, l);
+	}
+
+	return 0;
+}
+
+
+const struct blkid_idinfo drbdmanage_idinfo =
+{
+	.name		= "drbdmanage_control_volume",
+	.usage		= BLKID_USAGE_OTHER,
+	.probefunc	= probe_drbdmanage,
+	.minsz      = 64 * 1024,
+	.magics		= {
+		{ .magic = "$DRBDmgr=q", .len = 10, .sboff = 0 },
+	},
+};
+
diff --git a/libblkid/src/superblocks/superblocks.c b/libblkid/src/superblocks/superblocks.c
index 334d67304..0d970f134 100644
--- a/libblkid/src/superblocks/superblocks.c
+++ b/libblkid/src/superblocks/superblocks.c
@@ -103,6 +103,7 @@ static const struct blkid_idinfo *idinfos[] =
 
 	&bcache_idinfo,
 	&drbd_idinfo,
+	&drbdmanage_idinfo,
 	&drbdproxy_datalog_idinfo,
 	&lvm2_idinfo,
 	&lvm1_idinfo,
diff --git a/libblkid/src/superblocks/superblocks.h b/libblkid/src/superblocks/superblocks.h
index 238a9ff1b..79dba1a3c 100644
--- a/libblkid/src/superblocks/superblocks.h
+++ b/libblkid/src/superblocks/superblocks.h
@@ -68,6 +68,7 @@ extern const struct blkid_idinfo bfs_idinfo;
 extern const struct blkid_idinfo vmfs_volume_idinfo;
 extern const struct blkid_idinfo vmfs_fs_idinfo;
 extern const struct blkid_idinfo drbd_idinfo;
+extern const struct blkid_idinfo drbdmanage_idinfo;
 extern const struct blkid_idinfo drbdproxy_datalog_idinfo;
 extern const struct blkid_idinfo befs_idinfo;
 extern const struct blkid_idinfo nilfs2_idinfo;