Btrfs: Add backing store, memory management

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
new file mode 100644
index 000000000000..ee95fa05c4a3
--- /dev/null
+++ b/fs/btrfs/disk-io.h
@@ -0,0 +1,21 @@
+#ifndef __DISKIO__
+#define __DISKIO__
+
+struct tree_buffer {
+        u64 blocknr;
+        int count;
+        union {
+                struct node node;
+                struct leaf leaf;
+        };
+};
+
+struct tree_buffer *read_tree_block(struct ctree_root *root, u64 blocknr);
+int write_tree_block(struct ctree_root *root, struct tree_buffer *buf);
+struct ctree_root *open_ctree(char *filename);
+int close_ctree(struct ctree_root *root);
+void tree_block_release(struct ctree_root *root, struct tree_buffer *buf);
+struct tree_buffer *alloc_free_block(struct ctree_root *root);
+int update_root_block(struct ctree_root *root);
+
+#endif