-/*
- * EVERY CALL here except _init, _trunc, and _drop expects alloc_sem
- * to be held. The allocation cannot change at all while the map is
- * in the process of being updated.
- */
-int ocfs2_extent_map_init(struct inode *inode);
-int ocfs2_extent_map_append(struct inode *inode,
- struct ocfs2_extent_rec *rec,
- u32 new_clusters);
-int ocfs2_extent_map_get_blocks(struct inode *inode,
- u64 v_blkno, int count,
- u64 *p_blkno, int *ret_count);
-int ocfs2_extent_map_drop(struct inode *inode, u32 new_clusters);
-int ocfs2_extent_map_trunc(struct inode *inode, u32 new_clusters);
+ struct list_head ei_list;
+};
+
+#define OCFS2_MAX_EXTENT_MAP_ITEMS 3
+struct ocfs2_extent_map {
+ unsigned int em_num_items;
+ struct list_head em_list;
+};
+
+void ocfs2_extent_map_init(struct inode *inode);
+void ocfs2_extent_map_trunc(struct inode *inode, unsigned int cluster);
+void ocfs2_extent_map_insert_rec(struct inode *inode,
+ struct ocfs2_extent_rec *rec);
+
+int ocfs2_get_clusters(struct inode *inode, u32 v_cluster, u32 *p_cluster,
+ u32 *num_clusters, unsigned int *extent_flags);
+int ocfs2_extent_map_get_blocks(struct inode *inode, u64 v_blkno, u64 *p_blkno,
+ u64 *ret_count, unsigned int *extent_flags);