groundwork for subvolume and snapshot roots

2 files changed, 12 insertions, 0 deletions

diff --git a/ctree.h b/ctree.h
index 19e79270..4c752892 100644
--- a/ctree.h
+++ b/ctree.h
@@ -740,6 +740,17 @@ static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
 	s->blocknr = cpu_to_le64(val);
 }
 
+static inline u64 btrfs_super_generation(struct btrfs_super_block *s)
+{
+	return le64_to_cpu(s->generation);
+}
+
+static inline void btrfs_set_super_generation(struct btrfs_super_block *s,
+					      u64 val)
+{
+	s->generation = cpu_to_le64(val);
+}
+
 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
 {
 	return le64_to_cpu(s->root);
diff --git a/mkfs.c b/mkfs.c
index f182a190..c94dbf9c 100644
--- a/mkfs.c
+++ b/mkfs.c
@@ -120,6 +120,7 @@ int mkfs(int fd, u64 num_blocks, u32 blocksize)
 	u32 itemoff;
 	u32 start_block = BTRFS_SUPER_INFO_OFFSET / blocksize;
 
+	btrfs_set_super_generation(&super, 1);
 	btrfs_set_super_blocknr(&super, start_block);
 	btrfs_set_super_root(&super, start_block + 1);
 	strcpy((char *)(&super.magic), BTRFS_MAGIC);