Btrfs: add and improve comments

[pandora-kernel.git] / fs / btrfs / ref-cache.h

diff --git a/fs/btrfs/ref-cache.h b/fs/btrfs/ref-cache.h
index 6175647..16f3183 100644 (file)
--- a/fs/btrfs/ref-cache.h
+++ b/fs/btrfs/ref-cache.h
@@ -19,8 +19,11 @@
 #define __REFCACHE__
 
 struct btrfs_extent_info {
+       /* bytenr and num_bytes find the extent in the extent allocation tree */
        u64 bytenr;
        u64 num_bytes;
+
+       /* objectid and offset find the back reference for the file */
        u64 objectid;
        u64 offset;
 };