libblkid: Add support for Micron mpool formatted drives

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

libblkid/src/Makemodule.am

@@ -70,6 +70,7 @@ libblkid_la_SOURCES = \
 	libblkid/src/superblocks/luks.c \
 	libblkid/src/superblocks/lvm.c \
 	libblkid/src/superblocks/minix.c \
+	libblkid/src/superblocks/mpool.c \
 	libblkid/src/superblocks/netware.c \
 	libblkid/src/superblocks/nilfs.c \
 	libblkid/src/superblocks/ntfs.c \

libblkid/src/superblocks/mpool.c

@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2016 Micron Technology, Inc.
+ *
+ * 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 "crc32c.h"
+#include "superblocks.h"
+
+#include <uuid.h>
+
+#define MAX_MPOOL_NAME_LEN 32
+
+struct omf_sb_descriptor {
+	uint64_t        osb_magic;
+	uint8_t         osb_name[MAX_MPOOL_NAME_LEN];
+	uuid_t          osb_poolid; /* UUID of pool this drive belongs to */
+	uint16_t        osb_vers;
+	uint32_t        osb_gen;
+	uint32_t        osb_cksum1; /* crc32c of the preceding fields */
+} __attribute__((packed));
+
+static int probe_mpool(blkid_probe pr, const struct blkid_idmag *mag)
+{
+	struct omf_sb_descriptor *osd;
+	uint32_t sb_crc;
+
+	osd = blkid_probe_get_sb(pr, mag, struct omf_sb_descriptor);
+	if (!osd)
+		return errno ? -errno : 1;
+
+	sb_crc = crc32c(~0L, (const void *)osd,
+			offsetof(struct omf_sb_descriptor, osb_cksum1));
+	sb_crc ^= ~0L;
+
+	if (!blkid_probe_verify_csum(pr, sb_crc, osd->osb_cksum1))
+		return 1;
+
+	blkid_probe_set_label(pr, osd->osb_name, sizeof(osd->osb_name));
+	blkid_probe_set_uuid(pr, osd->osb_poolid);
+
+	return 0;
+}
+
+/**
+ * Superblock (sb) -- magic = ASCII "mpoolDev"
+ */
+#define MPOOL_SB_MAGIC "\x6D\x70\x6f\x6f\x6c\x44\x65\x76"
+
+const struct blkid_idinfo mpool_idinfo =
+{
+	.name		= "mpool",
+	.usage		= BLKID_USAGE_FILESYSTEM,
+	.probefunc	= probe_mpool,
+	.magics		=
+	{
+		{ .magic = MPOOL_SB_MAGIC, .len = 8},
+		{ NULL }
+	}
+};

libblkid/src/superblocks/superblocks.c

@@ -159,7 +159,8 @@ static const struct blkid_idinfo *idinfos[] =
 	&befs_idinfo,
 	&nilfs2_idinfo,
 	&exfat_idinfo,
-	&f2fs_idinfo
+	&f2fs_idinfo,
+	&mpool_idinfo
 };
 
 /*

libblkid/src/superblocks/superblocks.h

@@ -78,6 +78,7 @@ extern const struct blkid_idinfo nilfs2_idinfo;
 extern const struct blkid_idinfo exfat_idinfo;
 extern const struct blkid_idinfo f2fs_idinfo;
 extern const struct blkid_idinfo bcache_idinfo;
+extern const struct blkid_idinfo mpool_idinfo;
 
 /*
  * superblock functions