]>
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 */ | |
c8b97818 | 13 | #define EXTENT_FLAG_COMPRESSED 1 |
9036c102 | 14 | #define EXTENT_FLAG_VACANCY 2 /* no file extent item found */ |
7f3c74fb | 15 | |
a52d9a80 | 16 | struct extent_map { |
a52d9a80 | 17 | struct rb_node rb_node; |
d1310b2e CM |
18 | |
19 | /* all of these are in bytes */ | |
20 | u64 start; | |
21 | u64 len; | |
a52d9a80 | 22 | u64 block_start; |
c8b97818 | 23 | u64 block_len; |
d1310b2e | 24 | unsigned long flags; |
a52d9a80 CM |
25 | struct block_device *bdev; |
26 | atomic_t refs; | |
a52d9a80 | 27 | int in_tree; |
a52d9a80 CM |
28 | }; |
29 | ||
d1310b2e CM |
30 | struct extent_map_tree { |
31 | struct rb_root map; | |
d1310b2e | 32 | spinlock_t lock; |
a52d9a80 CM |
33 | }; |
34 | ||
d1310b2e CM |
35 | static inline u64 extent_map_end(struct extent_map *em) |
36 | { | |
37 | if (em->start + em->len < em->start) | |
38 | return (u64)-1; | |
39 | return em->start + em->len; | |
40 | } | |
41 | ||
42 | static inline u64 extent_map_block_end(struct extent_map *em) | |
43 | { | |
c8b97818 | 44 | if (em->block_start + em->block_len < em->block_start) |
d1310b2e | 45 | return (u64)-1; |
c8b97818 | 46 | return em->block_start + em->block_len; |
d1310b2e | 47 | } |
a52d9a80 | 48 | |
d1310b2e | 49 | void extent_map_tree_init(struct extent_map_tree *tree, gfp_t mask); |
a52d9a80 | 50 | struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree, |
d1310b2e | 51 | u64 start, u64 len); |
a52d9a80 CM |
52 | int add_extent_mapping(struct extent_map_tree *tree, |
53 | struct extent_map *em); | |
54 | int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em); | |
d1310b2e | 55 | |
a52d9a80 CM |
56 | struct extent_map *alloc_extent_map(gfp_t mask); |
57 | void free_extent_map(struct extent_map *em); | |
2f4cbe64 | 58 | int __init extent_map_init(void); |
17636e03 | 59 | void extent_map_exit(void); |
a52d9a80 | 60 | #endif |