]>
Commit | Line | Data |
---|---|---|
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 */ | |
13 | ||
a52d9a80 | 14 | struct extent_map { |
a52d9a80 | 15 | struct rb_node rb_node; |
d1310b2e CM |
16 | |
17 | /* all of these are in bytes */ | |
18 | u64 start; | |
19 | u64 len; | |
a52d9a80 | 20 | u64 block_start; |
d1310b2e | 21 | unsigned long flags; |
a52d9a80 CM |
22 | struct block_device *bdev; |
23 | atomic_t refs; | |
a52d9a80 | 24 | int in_tree; |
a52d9a80 CM |
25 | }; |
26 | ||
d1310b2e CM |
27 | struct extent_map_tree { |
28 | struct rb_root map; | |
d1310b2e | 29 | spinlock_t lock; |
a52d9a80 CM |
30 | }; |
31 | ||
d1310b2e CM |
32 | static inline u64 extent_map_end(struct extent_map *em) |
33 | { | |
34 | if (em->start + em->len < em->start) | |
35 | return (u64)-1; | |
36 | return em->start + em->len; | |
37 | } | |
38 | ||
39 | static inline u64 extent_map_block_end(struct extent_map *em) | |
40 | { | |
41 | if (em->block_start + em->len < em->block_start) | |
42 | return (u64)-1; | |
43 | return em->block_start + em->len; | |
44 | } | |
a52d9a80 | 45 | |
d1310b2e | 46 | void extent_map_tree_init(struct extent_map_tree *tree, gfp_t mask); |
a52d9a80 | 47 | struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree, |
d1310b2e | 48 | u64 start, u64 len); |
a52d9a80 CM |
49 | int add_extent_mapping(struct extent_map_tree *tree, |
50 | struct extent_map *em); | |
51 | int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em); | |
d1310b2e | 52 | |
a52d9a80 CM |
53 | struct extent_map *alloc_extent_map(gfp_t mask); |
54 | void free_extent_map(struct extent_map *em); | |
2f4cbe64 | 55 | int __init extent_map_init(void); |
17636e03 | 56 | void extent_map_exit(void); |
a52d9a80 | 57 | #endif |