ocfs2: Provide the get_root_el() method to ocfs2_extent_tree_operations.

The root_el of an ocfs2_extent_tree needs to be calculated from
et->et_object.  Make it an operation on et->et_ops.

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

1 files changed, 30 insertions, 8 deletions

diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index 4cefcb6a47a5..fe2ddbb81f74 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -72,6 +72,10 @@ struct ocfs2_extent_tree_operations {
                                    struct ocfs2_extent_tree *et,
                                    u32 new_clusters);
         int (*eo_sanity_check)(struct inode *inode, struct ocfs2_extent_tree *et);
+
+        /* These are internal to ocfs2_extent_tree and don't have
+         * accessor functions */
+        void (*eo_fill_root_el)(struct ocfs2_extent_tree *et);
 };
 
 struct ocfs2_extent_tree {
@@ -83,6 +87,13 @@ struct ocfs2_extent_tree {
         unsigned int                            et_max_leaf_clusters;
 };
 
+static void ocfs2_dinode_fill_root_el(struct ocfs2_extent_tree *et)
+{
+        struct ocfs2_dinode *di = et->et_object;
+
+        et->et_root_el = &di->id2.i_list;
+}
+
 static void ocfs2_dinode_set_last_eb_blk(struct ocfs2_extent_tree *et,
                                          u64 blkno)
 {
@@ -136,8 +147,16 @@ static struct ocfs2_extent_tree_operations ocfs2_dinode_et_ops = {
         .eo_get_last_eb_blk     = ocfs2_dinode_get_last_eb_blk,
         .eo_update_clusters     = ocfs2_dinode_update_clusters,
         .eo_sanity_check        = ocfs2_dinode_sanity_check,
+        .eo_fill_root_el        = ocfs2_dinode_fill_root_el,
 };
 
+static void ocfs2_xattr_value_fill_root_el(struct ocfs2_extent_tree *et)
+{
+        struct ocfs2_xattr_value_root *xv = et->et_object;
+
+        et->et_root_el = &xv->xr_list;
+}
+
 static void ocfs2_xattr_value_set_last_eb_blk(struct ocfs2_extent_tree *et,
                                               u64 blkno)
 {
@@ -176,8 +195,16 @@ static struct ocfs2_extent_tree_operations ocfs2_xattr_et_ops = {
         .eo_get_last_eb_blk     = ocfs2_xattr_value_get_last_eb_blk,
         .eo_update_clusters     = ocfs2_xattr_value_update_clusters,
         .eo_sanity_check        = ocfs2_xattr_value_sanity_check,
+        .eo_fill_root_el        = ocfs2_xattr_value_fill_root_el,
 };
 
+static void ocfs2_xattr_tree_fill_root_el(struct ocfs2_extent_tree *et)
+{
+        struct ocfs2_xattr_block *xb = et->et_object;
+
+        et->et_root_el = &xb->xb_attrs.xb_root.xt_list;
+}
+
 static void ocfs2_xattr_tree_set_last_eb_blk(struct ocfs2_extent_tree *et,
                                              u64 blkno)
 {
@@ -215,6 +242,7 @@ static struct ocfs2_extent_tree_operations ocfs2_xattr_tree_et_ops = {
         .eo_get_last_eb_blk     = ocfs2_xattr_tree_get_last_eb_blk,
         .eo_update_clusters     = ocfs2_xattr_tree_update_clusters,
         .eo_sanity_check        = ocfs2_xattr_tree_sanity_check,
+        .eo_fill_root_el        = ocfs2_xattr_tree_fill_root_el,
 };
 
 static void ocfs2_get_extent_tree(struct ocfs2_extent_tree *et,
@@ -232,22 +260,16 @@ static void ocfs2_get_extent_tree(struct ocfs2_extent_tree *et,
         et->et_object = obj;
 
         if (et_type == OCFS2_DINODE_EXTENT) {
-                et->et_root_el =
-                        &((struct ocfs2_dinode *)obj)->id2.i_list;
                 et->et_ops = &ocfs2_dinode_et_ops;
         } else if (et_type == OCFS2_XATTR_VALUE_EXTENT) {
-                struct ocfs2_xattr_value_root *xv =
-                        (struct ocfs2_xattr_value_root *)obj;
-                et->et_root_el = &xv->xr_list;
                 et->et_ops = &ocfs2_xattr_et_ops;
         } else if (et_type == OCFS2_XATTR_TREE_EXTENT) {
-                struct ocfs2_xattr_block *xb =
-                        (struct ocfs2_xattr_block *)obj;
-                et->et_root_el = &xb->xb_attrs.xb_root.xt_list;
                 et->et_ops = &ocfs2_xattr_tree_et_ops;
                 et->et_max_leaf_clusters = ocfs2_clusters_for_bytes(inode->i_sb,
                                                 OCFS2_MAX_XATTR_TREE_LEAF_SIZE);
         }
+
+        et->et_ops->eo_fill_root_el(et);
 }
 
 static void ocfs2_put_extent_tree(struct ocfs2_extent_tree *et)