1 files changed, 27 insertions, 4 deletions

diff --git a/fs/ocfs2/ocfs2_fs.h b/fs/ocfs2/ocfs2_fs.h
index e61e218f5e0b..71306479c68f 100644
--- 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
 
 /*
@@ -155,6 +156,12 @@
 #define OCFS2_FL_MODIFIABLE     (0x000100FF)    /* User modifiable flags */
 
 /*
+ * Extent record flags (e_node.leaf.flags)
+ */
+#define OCFS2_EXT_UNWRITTEN     (0x01)  /* Extent is allocated but
+                                         * unwritten */
+
+/*
  * ioctl commands
  */
 #define OCFS2_IOC_GETFLAGS      _IOR('f', 1, long)
@@ -282,10 +289,21 @@ static unsigned char ocfs2_type_by_mode[S_IFMT >> S_SHIFT] = {
 /*
  * On disk extent record for OCFS2
  * It describes a range of clusters on disk.
+ *
+ * Length fields are divided into interior and leaf node versions.
+ * This leaves room for a flags field (OCFS2_EXT_*) in the leaf nodes.
  */
 struct ocfs2_extent_rec {
 /*00*/  __le32 e_cpos;          /* Offset into the file, in clusters */
-        __le32 e_clusters;      /* Clusters covered by this extent */
+        union {
+                __le32 e_int_clusters; /* Clusters covered by all children */
+                struct {
+                        __le16 e_leaf_clusters; /* Clusters covered by this
+                                                   extent */
+                        __u8 e_reserved1;
+                        __u8 e_flags; /* Extent flags */
+                };
+        };
         __le64 e_blkno;         /* Physical disk offset, in blocks */
 /*10*/
 };
@@ -311,7 +329,10 @@ 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;
@@ -446,7 +467,9 @@ struct ocfs2_dinode {
         __le32 i_ctime_nsec;
         __le32 i_mtime_nsec;
         __le32 i_attr;
-        __le32 i_reserved1;
+        __le16 i_orphaned_slot;         /* Only valid when OCFS2_ORPHANED_FL
+                                           was set in i_flags */
+        __le16 i_reserved1;
 /*70*/  __le64 i_reserved2[8];
 /*B8*/  union {
                 __le64 i_pad1;          /* Generic way to refer to this