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 */
13 #define EXTENT_FLAG_COMPRESSED 1
14 #define EXTENT_FLAG_VACANCY 2 /* no file extent item found */
15 #define EXTENT_FLAG_PREALLOC 3 /* pre-allocated extent */
16 #define EXTENT_FLAG_LOGGING 4 /* Logging this extent */
17 #define EXTENT_FLAG_FILLING 5 /* Filling in a preallocated extent */
20 struct rb_node rb_node;
22 /* all of these are in bytes */
34 struct block_device *bdev;
36 unsigned int compress_type;
37 struct list_head list;
40 struct extent_map_tree {
42 struct list_head modified_extents;
46 static inline int extent_map_in_tree(const struct extent_map *em)
48 return !RB_EMPTY_NODE(&em->rb_node);
51 static inline u64 extent_map_end(struct extent_map *em)
53 if (em->start + em->len < em->start)
55 return em->start + em->len;
58 static inline u64 extent_map_block_end(struct extent_map *em)
60 if (em->block_start + em->block_len < em->block_start)
62 return em->block_start + em->block_len;
65 void extent_map_tree_init(struct extent_map_tree *tree);
66 struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
68 int add_extent_mapping(struct extent_map_tree *tree,
69 struct extent_map *em, int modified);
70 int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
71 void replace_extent_mapping(struct extent_map_tree *tree,
72 struct extent_map *cur,
73 struct extent_map *new,
76 struct extent_map *alloc_extent_map(void);
77 void free_extent_map(struct extent_map *em);
78 int __init extent_map_init(void);
79 void extent_map_exit(void);
80 int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len, u64 gen);
81 void clear_em_logging(struct extent_map_tree *tree, struct extent_map *em);
82 struct extent_map *search_extent_mapping(struct extent_map_tree *tree,