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authorChris Mason <chris.mason@oracle.com>2008-09-29 15:18:18 -0400
committerChris Mason <chris.mason@oracle.com>2008-09-29 15:18:18 -0400
commitd352ac68148b69937d39ca5d48bcc4478e118dbf (patch)
tree7951dd7311999d9e77766acdc7f8e93de97874d8 /fs/btrfs/ref-cache.h
parent9a5e1ea1e1e539e244a54afffc330fc368376ab9 (diff)
downloadlinux-d352ac68148b69937d39ca5d48bcc4478e118dbf.tar.bz2
Btrfs: add and improve comments
This improves the comments at the top of many functions. It didn't dive into the guts of functions because I was trying to avoid merging problems with the new allocator and back reference work. extent-tree.c and volumes.c were both skipped, and there is definitely more work todo in cleaning and commenting the code. Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/ref-cache.h')
-rw-r--r--fs/btrfs/ref-cache.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/btrfs/ref-cache.h b/fs/btrfs/ref-cache.h
index 617564787f52..16f3183d7c59 100644
--- 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;
};