Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4

[safe/jmp/linux-2.6] / fs / btrfs / ref-cache.h

diff --git a/fs/btrfs/ref-cache.h b/fs/btrfs/ref-cache.h
index 6175647..bc283ad 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;
 };
@@ -70,5 +73,4 @@ int btrfs_add_leaf_ref(struct btrfs_root *root, struct btrfs_leaf_ref *ref,
 int btrfs_remove_leaf_refs(struct btrfs_root *root, u64 max_root_gen,
                           int shared);
 int btrfs_remove_leaf_ref(struct btrfs_root *root, struct btrfs_leaf_ref *ref);
-
 #endif