ocfs2: sparse b-tree support

[deliverable/linux.git] / fs / ocfs2 / ocfs2_fs.h

diff --git a/fs/ocfs2/ocfs2_fs.h b/fs/ocfs2/ocfs2_fs.h
index a476b63e2e6037f3abaa85d193949a1b5986abae..f0101974f4f94a70074b04e8bfd35b52ca2cc3f8 100644 (file)
--- a/fs/ocfs2/ocfs2_fs.h
+++ b/fs/ocfs2/ocfs2_fs.h
@@ -86,7 +86,8 @@
        OCFS2_SB(sb)->s_feature_incompat &= ~(mask)
 
 #define OCFS2_FEATURE_COMPAT_SUPP      OCFS2_FEATURE_COMPAT_BACKUP_SB
-#define OCFS2_FEATURE_INCOMPAT_SUPP    OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT
+#define OCFS2_FEATURE_INCOMPAT_SUPP    (OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT \
+                                        | OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC)
 #define OCFS2_FEATURE_RO_COMPAT_SUPP   0
 
 /*
@@ -311,7 +312,10 @@ struct ocfs2_extent_list {
 /*00*/ __le16 l_tree_depth;            /* Extent tree depth from this
                                           point.  0 means data extents
                                           hang directly off this
-                                          header (a leaf) */
+                                          header (a leaf)
+                                          NOTE: The high 8 bits cannot be
+                                          used - tree_depth is never that big.
+                                       */
        __le16 l_count;                 /* Number of extent records */
        __le16 l_next_free_rec;         /* Next unused extent slot */
        __le16 l_reserved1;