diff --git a/image/main.c b/image/main.c
index b29e68f8..171072c4 100644
--- a/image/main.c
+++ b/image/main.c
@@ -45,6 +45,19 @@
 
 #define MAX_WORKER_THREADS	(32)
 
+const struct dump_version dump_versions[] = {
+	/*
+	 * The original format, which only supports tree blocks and free space
+	 * cache dump.
+	 */
+	{ .version = 0,
+	  .max_pending_size = SZ_256K,
+	  .magic_cpu = 0xbd5c25e27295668bULL,
+	  .extra_sb_flags = 1 },
+};
+
+const struct dump_version *current_version = &dump_versions[0];
+
 struct async_work {
 	struct list_head list;
 	struct list_head ordered;
@@ -406,7 +419,7 @@ static void meta_cluster_init(struct metadump_struct *md, u64 start)
 	md->num_items = 0;
 	md->num_ready = 0;
 	header = &md->cluster.header;
-	header->magic = cpu_to_le64(HEADER_MAGIC);
+	header->magic = cpu_to_le64(current_version->magic_cpu);
 	header->bytenr = cpu_to_le64(start);
 	header->nritems = cpu_to_le32(0);
 	header->compress = md->compress_level > 0 ?
@@ -718,7 +731,7 @@ static int add_extent(u64 start, u64 size, struct metadump_struct *md,
 {
 	int ret;
 	if (md->data != data ||
-	    md->pending_size + size > MAX_PENDING_SIZE ||
+	    md->pending_size + size > current_version->max_pending_size ||
 	    md->pending_start + md->pending_size != start) {
 		ret = flush_pending(md, 0);
 		if (ret)
@@ -1047,7 +1060,8 @@ static void update_super_old(u8 *buffer)
 	u32 sectorsize = btrfs_super_sectorsize(super);
 	u64 flags = btrfs_super_flags(super);
 
-	flags |= BTRFS_SUPER_FLAG_METADUMP;
+	if (current_version->extra_sb_flags)
+		flags |= BTRFS_SUPER_FLAG_METADUMP;
 	btrfs_set_super_flags(super, flags);
 
 	key = (struct btrfs_disk_key *)(super->sys_chunk_array);
@@ -1147,7 +1161,8 @@ finish:
 	if (mdres->clear_space_cache)
 		btrfs_set_super_cache_generation(super, 0);
 
-	flags |= BTRFS_SUPER_FLAG_METADUMP_V2;
+	if (current_version->extra_sb_flags)
+		flags |= BTRFS_SUPER_FLAG_METADUMP_V2;
 	btrfs_set_super_flags(super, flags);
 	btrfs_set_super_sys_array_size(super, new_array_size);
 	btrfs_set_super_num_devices(super, 1);
@@ -1337,7 +1352,7 @@ static void *restore_worker(void *data)
 	u8 *outbuf;
 	int outfd;
 	int ret;
-	int compress_size = MAX_PENDING_SIZE * 4;
+	int compress_size = current_version->max_pending_size * 4;
 
 	outfd = fileno(mdres->out);
 	buffer = malloc(compress_size);
@@ -1490,6 +1505,42 @@ static void mdrestore_destroy(struct mdrestore_struct *mdres, int num_threads)
 	free(mdres->original_super);
 }
 
+static int detect_version(FILE *in)
+{
+	struct meta_cluster *cluster;
+	u8 buf[BLOCK_SIZE];
+	bool found = false;
+	int i;
+	int ret;
+
+	if (fseek(in, 0, SEEK_SET) < 0) {
+		error("seek failed: %m");
+		return -errno;
+	}
+	ret = fread(buf, BLOCK_SIZE, 1, in);
+	if (!ret) {
+		error("failed to read header");
+		return -EIO;
+	}
+
+	fseek(in, 0, SEEK_SET);
+	cluster = (struct meta_cluster *)buf;
+	for (i = 0; i < ARRAY_SIZE(dump_versions); i++) {
+		if (le64_to_cpu(cluster->header.magic) ==
+		    dump_versions[i].magic_cpu) {
+			found = true;
+			current_version = &dump_versions[i];
+			break;
+		}
+	}
+
+	if (!found) {
+		error("unrecognized header format");
+		return -EINVAL;
+	}
+	return 0;
+}
+
 static int mdrestore_init(struct mdrestore_struct *mdres,
 			  FILE *in, FILE *out, int old_restore,
 			  int num_threads, int fixup_offset,
@@ -1497,6 +1548,9 @@ static int mdrestore_init(struct mdrestore_struct *mdres,
 {
 	int i, ret = 0;
 
+	ret = detect_version(in);
+	if (ret < 0)
+		return ret;
 	memset(mdres, 0, sizeof(*mdres));
 	pthread_cond_init(&mdres->cond, NULL);
 	pthread_mutex_init(&mdres->mutex, NULL);
@@ -1850,7 +1904,7 @@ static int search_for_chunk_blocks(struct mdrestore_struct *mdres)
 	u64 current_cluster = 0, bytenr;
 	u64 item_bytenr;
 	u32 bufsize, nritems, i;
-	u32 max_size = MAX_PENDING_SIZE * 2;
+	u32 max_size = current_version->max_pending_size * 2;
 	u8 *buffer, *tmp = NULL;
 	int ret = 0;
 
@@ -1903,7 +1957,7 @@ static int search_for_chunk_blocks(struct mdrestore_struct *mdres)
 		ret = 0;
 
 		header = &cluster->header;
-		if (le64_to_cpu(header->magic) != HEADER_MAGIC ||
+		if (le64_to_cpu(header->magic) != current_version->magic_cpu ||
 		    le64_to_cpu(header->bytenr) != current_cluster) {
 			error("bad header in metadump image");
 			ret = -EIO;
@@ -2102,7 +2156,7 @@ static int build_chunk_tree(struct mdrestore_struct *mdres,
 	ret = 0;
 
 	header = &cluster->header;
-	if (le64_to_cpu(header->magic) != HEADER_MAGIC ||
+	if (le64_to_cpu(header->magic) != current_version->magic_cpu ||
 	    le64_to_cpu(header->bytenr) != 0) {
 		error("bad header in metadump image");
 		return -EIO;
@@ -2675,7 +2729,7 @@ static int restore_metadump(const char *input, FILE *out, int old_restore,
 			break;
 
 		header = &cluster->header;
-		if (le64_to_cpu(header->magic) != HEADER_MAGIC ||
+		if (le64_to_cpu(header->magic) != current_version->magic_cpu ||
 		    le64_to_cpu(header->bytenr) != bytenr) {
 			error("bad header in metadump image");
 			ret = -EIO;
diff --git a/image/metadump.h b/image/metadump.h
index 57bc3bf2..bcffbd47 100644
--- a/image/metadump.h
+++ b/image/metadump.h
@@ -22,8 +22,6 @@
 #include "kernel-lib/list.h"
 #include "kernel-shared/ctree.h"
 
-#define HEADER_MAGIC		0xbd5c25e27295668bULL
-#define MAX_PENDING_SIZE	SZ_256K
 #define BLOCK_SIZE		SZ_1K
 #define BLOCK_MASK		(BLOCK_SIZE - 1)
 
@@ -33,6 +31,16 @@
 #define COMPRESS_NONE		0
 #define COMPRESS_ZLIB		1
 
+struct dump_version {
+	u64 magic_cpu;
+	int version;
+	int max_pending_size;
+	unsigned int extra_sb_flags:1;
+};
+
+extern const struct dump_version dump_versions[];
+const extern struct dump_version *current_version;
+
 struct meta_cluster_item {
 	__le64 bytenr;
 	__le32 size;