ocfs2: Store dir index records inline

Allow us to store a small number of directory index records in the
ocfs2_dx_root_block. This saves us a disk read on small to medium sized
directories (less than about 250 entries). The inline root is automatically
turned into a root block with extents if the directory size increases beyond
it's capacity.

Signed-off-by: Mark Fasheh <mfasheh@suse.com>
Acked-by: Joel Becker <joel.becker@oracle.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/ocfs2/dir.h b/fs/ocfs2/dir.h
index d273aaef2ec2..07b0416cdd42 100644
--- a/fs/ocfs2/dir.h
+++ b/fs/ocfs2/dir.h
@@ -37,6 +37,8 @@ struct ocfs2_dir_lookup_result {
         struct ocfs2_dir_entry          *dl_entry;      /* Target dirent in
                                                          * unindexed leaf */
 
+        struct buffer_head              *dl_dx_root_bh; /* Root of indexed
+                                                         * tree */
         struct buffer_head              *dl_dx_leaf_bh; /* Indexed leaf block */
         struct ocfs2_dx_entry           *dl_dx_entry;   /* Target dx_entry in
                                                          * indexed leaf */