btrfs-progs support for root block accountingv0.8

This adds support for keeping track of the number of blocks used by
root_item's.  This makes it so that mkfs lays down the "default" subvol with
the correct block accounting in place.  Thank you,

1 files changed, 11 insertions, 0 deletions

diff --git a/ctree.h b/ctree.h
index fc84de32..7be96c44 100644
--- a/ctree.h
+++ b/ctree.h
@@ -784,6 +784,17 @@ static inline void btrfs_set_root_flags(struct btrfs_root_item *item, u32 val)
 	item->flags = cpu_to_le32(val);
 }
 
+static inline void btrfs_set_root_blocks_used(struct btrfs_root_item *item,
+					      u64 val)
+{
+	item->blocks_used = cpu_to_le64(val);
+}
+
+static inline u64 btrfs_root_blocks_used(struct btrfs_root_item *item)
+{
+	return le64_to_cpu(item->blocks_used);
+}
+
 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
 {
 	return le64_to_cpu(s->blocknr);