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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 | |
17 | struct extent_map { |
18 | struct rb_node rb_node; |
19 | |
20 | /* all of these are in bytes */ |
21 | u64 start; |
22 | u64 len; |
23 | u64 orig_start; |
24 | u64 block_start; |
25 | u64 block_len; |
26 | unsigned long flags; |
27 | struct block_device *bdev; |
28 | atomic_t refs; |
29 | int in_tree; |
30 | }; |
31 | |
32 | struct extent_map_tree { |
33 | struct rb_root map; |
34 | spinlock_t lock; |
35 | }; |
36 | |
37 | static inline u64 extent_map_end(struct extent_map *em) |
38 | { |
39 | if (em->start + em->len < em->start) |
40 | return (u64)-1; |
41 | return em->start + em->len; |
42 | } |
43 | |
44 | static inline u64 extent_map_block_end(struct extent_map *em) |
45 | { |
46 | if (em->block_start + em->block_len < em->block_start) |
47 | return (u64)-1; |
48 | return em->block_start + em->block_len; |
49 | } |
50 | |
51 | void extent_map_tree_init(struct extent_map_tree *tree, gfp_t mask); |
52 | struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree, |
53 | u64 start, u64 len); |
54 | int add_extent_mapping(struct extent_map_tree *tree, |
55 | struct extent_map *em); |
56 | int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em); |
57 | |
58 | struct extent_map *alloc_extent_map(gfp_t mask); |
59 | void free_extent_map(struct extent_map *em); |
60 | int __init extent_map_init(void); |
61 | void extent_map_exit(void); |
62 | #endif |
63 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9