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 |
9036c102 | 14 | #define EXTENT_FLAG_VACANCY 2 /* no file extent item found */ |
d899e052 | 15 | #define EXTENT_FLAG_PREALLOC 3 /* pre-allocated extent */ |
ff44c6e3 | 16 | #define EXTENT_FLAG_LOGGING 4 /* Logging this extent */ |
7f3c74fb | 17 | |
a52d9a80 | 18 | struct extent_map { |
a52d9a80 | 19 | struct rb_node rb_node; |
d1310b2e CM |
20 | |
21 | /* all of these are in bytes */ | |
22 | u64 start; | |
23 | u64 len; | |
4e2f84e6 LB |
24 | u64 mod_start; |
25 | u64 mod_len; | |
ff5b7ee3 | 26 | u64 orig_start; |
a52d9a80 | 27 | u64 block_start; |
c8b97818 | 28 | u64 block_len; |
5dc562c5 | 29 | u64 generation; |
d1310b2e | 30 | unsigned long flags; |
a52d9a80 CM |
31 | struct block_device *bdev; |
32 | atomic_t refs; | |
c08782da DS |
33 | unsigned int in_tree; |
34 | unsigned int compress_type; | |
5dc562c5 | 35 | struct list_head list; |
a52d9a80 CM |
36 | }; |
37 | ||
d1310b2e CM |
38 | struct extent_map_tree { |
39 | struct rb_root map; | |
5dc562c5 | 40 | struct list_head modified_extents; |
890871be | 41 | rwlock_t lock; |
a52d9a80 CM |
42 | }; |
43 | ||
d1310b2e CM |
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 | { | |
c8b97818 | 53 | if (em->block_start + em->block_len < em->block_start) |
d1310b2e | 54 | return (u64)-1; |
c8b97818 | 55 | return em->block_start + em->block_len; |
d1310b2e | 56 | } |
a52d9a80 | 57 | |
a8067e02 | 58 | void extent_map_tree_init(struct extent_map_tree *tree); |
a52d9a80 | 59 | struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree, |
d1310b2e | 60 | u64 start, u64 len); |
a52d9a80 CM |
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); | |
d1310b2e | 64 | |
172ddd60 | 65 | struct extent_map *alloc_extent_map(void); |
a52d9a80 | 66 | void free_extent_map(struct extent_map *em); |
2f4cbe64 | 67 | int __init extent_map_init(void); |
17636e03 | 68 | void extent_map_exit(void); |
5dc562c5 | 69 | int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len, u64 gen); |
b917b7c3 CM |
70 | struct extent_map *search_extent_mapping(struct extent_map_tree *tree, |
71 | u64 start, u64 len); | |
a52d9a80 | 72 | #endif |