void __init extent_map_init(void);
void __exit extent_map_exit(void);
int extent_clean_all_trees(struct extent_map_tree *tree);
+int clear_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
+ int bits, gfp_t mask);
+int set_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
+ int bits, gfp_t mask);
int set_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end,
gfp_t mask);
int set_extent_new(struct extent_map_tree *tree, u64 start, u64 end,