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Commit | Line | Data |
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a52d9a80 CM |
1 | #ifndef __EXTENTMAP__ |
2 | #define __EXTENTMAP__ | |
3 | ||
4 | #include <linux/rbtree.h> | |
5 | ||
d1310b2e | 6 | #define EXTENT_MAP_LAST_BYTE (u64)-4 |
5f39d397 | 7 | #define EXTENT_MAP_HOLE (u64)-3 |
a52d9a80 CM |
8 | #define EXTENT_MAP_INLINE (u64)-2 |
9 | #define EXTENT_MAP_DELALLOC (u64)-1 | |
10 | ||
7f3c74fb CM |
11 | /* bits for the flags field */ |
12 | #define EXTENT_FLAG_PINNED 0 /* this entry not yet on disk, don't free it */ | |
c8b97818 | 13 | #define EXTENT_FLAG_COMPRESSED 1 |
7f3c74fb | 14 | |
a52d9a80 | 15 | struct extent_map { |
a52d9a80 | 16 | struct rb_node rb_node; |
d1310b2e CM |
17 | |
18 | /* all of these are in bytes */ | |
19 | u64 start; | |
20 | u64 len; | |
a52d9a80 | 21 | u64 block_start; |
c8b97818 | 22 | u64 block_len; |
d1310b2e | 23 | unsigned long flags; |
a52d9a80 CM |
24 | struct block_device *bdev; |
25 | atomic_t refs; | |
a52d9a80 | 26 | int in_tree; |
a52d9a80 CM |
27 | }; |
28 | ||
d1310b2e CM |
29 | struct extent_map_tree { |
30 | struct rb_root map; | |
d1310b2e | 31 | spinlock_t lock; |
a52d9a80 CM |
32 | }; |
33 | ||
d1310b2e CM |
34 | static inline u64 extent_map_end(struct extent_map *em) |
35 | { | |
36 | if (em->start + em->len < em->start) | |
37 | return (u64)-1; | |
38 | return em->start + em->len; | |
39 | } | |
40 | ||
41 | static inline u64 extent_map_block_end(struct extent_map *em) | |
42 | { | |
c8b97818 | 43 | if (em->block_start + em->block_len < em->block_start) |
d1310b2e | 44 | return (u64)-1; |
c8b97818 | 45 | return em->block_start + em->block_len; |
d1310b2e | 46 | } |
a52d9a80 | 47 | |
d1310b2e | 48 | void extent_map_tree_init(struct extent_map_tree *tree, gfp_t mask); |
a52d9a80 | 49 | struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree, |
d1310b2e | 50 | u64 start, u64 len); |
a52d9a80 CM |
51 | int add_extent_mapping(struct extent_map_tree *tree, |
52 | struct extent_map *em); | |
53 | int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em); | |
d1310b2e | 54 | |
a52d9a80 CM |
55 | struct extent_map *alloc_extent_map(gfp_t mask); |
56 | void free_extent_map(struct extent_map *em); | |
2f4cbe64 | 57 | int __init extent_map_init(void); |
17636e03 | 58 | void extent_map_exit(void); |
a52d9a80 | 59 | #endif |