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Merge commit '5bc66170dc486556a1e36fd384463536573f4b82' into x86/urgent
[mirror_ubuntu-bionic-kernel.git] / fs / btrfs / extent_map.h
1 #ifndef __EXTENTMAP__
2 #define __EXTENTMAP__
3
4 #include <linux/rbtree.h>
5
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
10
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
18 struct extent_map {
19 struct rb_node rb_node;
20
21 /* all of these are in bytes */
22 u64 start;
23 u64 len;
24 u64 mod_start;
25 u64 mod_len;
26 u64 orig_start;
27 u64 block_start;
28 u64 block_len;
29 u64 generation;
30 unsigned long flags;
31 struct block_device *bdev;
32 atomic_t refs;
33 unsigned int in_tree;
34 unsigned int compress_type;
35 struct list_head list;
36 };
37
38 struct extent_map_tree {
39 struct rb_root map;
40 struct list_head modified_extents;
41 rwlock_t lock;
42 };
43
44 static inline u64 extent_map_end(struct extent_map *em)
45 {
46 if (em->start + em->len < em->start)
47 return (u64)-1;
48 return em->start + em->len;
49 }
50
51 static inline u64 extent_map_block_end(struct extent_map *em)
52 {
53 if (em->block_start + em->block_len < em->block_start)
54 return (u64)-1;
55 return em->block_start + em->block_len;
56 }
57
58 void extent_map_tree_init(struct extent_map_tree *tree);
59 struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
60 u64 start, u64 len);
61 int add_extent_mapping(struct extent_map_tree *tree,
62 struct extent_map *em);
63 int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
64
65 struct extent_map *alloc_extent_map(void);
66 void free_extent_map(struct extent_map *em);
67 int __init extent_map_init(void);
68 void extent_map_exit(void);
69 int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len, u64 gen);
70 struct extent_map *search_extent_mapping(struct extent_map_tree *tree,
71 u64 start, u64 len);
72 #endif