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 */
19 struct rb_node rb_node;
21 /* all of these are in bytes */
32 struct block_device *bdev;
35 unsigned int compress_type;
36 struct list_head list;
39 struct extent_map_tree {
41 struct list_head modified_extents;
45 static inline u64 extent_map_end(struct extent_map *em)
47 if (em->start + em->len < em->start)
49 return em->start + em->len;
52 static inline u64 extent_map_block_end(struct extent_map *em)
54 if (em->block_start + em->block_len < em->block_start)
56 return em->block_start + em->block_len;
59 void extent_map_tree_init(struct extent_map_tree *tree);
60 struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
62 int add_extent_mapping(struct extent_map_tree *tree,
63 struct extent_map *em);
64 int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
66 struct extent_map *alloc_extent_map(void);
67 void free_extent_map(struct extent_map *em);
68 int __init extent_map_init(void);
69 void extent_map_exit(void);
70 int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len, u64 gen);
71 struct extent_map *search_extent_mapping(struct extent_map_tree *tree,