4 #include <linux/rbtree.h>
6 #define EXTENT_MAP_LAST_BYTE (u64)-4
7 #define EXTENT_MAP_HOLE (u64)-3
8 #define EXTENT_MAP_INLINE (u64)-2
9 #define EXTENT_MAP_DELALLOC (u64)-1
11 /* bits for the flags field */
12 #define EXTENT_FLAG_PINNED 0 /* this entry not yet on disk, don't free it */
15 struct rb_node rb_node;
17 /* all of these are in bytes */
22 struct block_device *bdev;
27 struct extent_map_tree {
29 struct extent_map *last;
33 static inline u64 extent_map_end(struct extent_map *em)
35 if (em->start + em->len < em->start)
37 return em->start + em->len;
40 static inline u64 extent_map_block_end(struct extent_map *em)
42 if (em->block_start + em->len < em->block_start)
44 return em->block_start + em->len;
47 void extent_map_tree_init(struct extent_map_tree *tree, gfp_t mask);
48 struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
50 int add_extent_mapping(struct extent_map_tree *tree,
51 struct extent_map *em);
52 int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
54 struct extent_map *alloc_extent_map(gfp_t mask);
55 void free_extent_map(struct extent_map *em);
56 int __init extent_map_init(void);
57 void extent_map_exit(void);