Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
9888c340 DS |
2 | |
3 | #ifndef BTRFS_EXTENT_MAP_H | |
4 | #define BTRFS_EXTENT_MAP_H | |
a52d9a80 CM |
5 | |
6 | #include <linux/rbtree.h> | |
490b54d6 | 7 | #include <linux/refcount.h> |
a52d9a80 | 8 | |
e248e04e DG |
9 | #define EXTENT_MAP_LAST_BYTE ((u64)-4) |
10 | #define EXTENT_MAP_HOLE ((u64)-3) | |
11 | #define EXTENT_MAP_INLINE ((u64)-2) | |
12 | #define EXTENT_MAP_DELALLOC ((u64)-1) | |
a52d9a80 | 13 | |
7f3c74fb CM |
14 | /* bits for the flags field */ |
15 | #define EXTENT_FLAG_PINNED 0 /* this entry not yet on disk, don't free it */ | |
c8b97818 | 16 | #define EXTENT_FLAG_COMPRESSED 1 |
d899e052 | 17 | #define EXTENT_FLAG_PREALLOC 3 /* pre-allocated extent */ |
ff44c6e3 | 18 | #define EXTENT_FLAG_LOGGING 4 /* Logging this extent */ |
b11e234d | 19 | #define EXTENT_FLAG_FILLING 5 /* Filling in a preallocated extent */ |
298a8f9c | 20 | #define EXTENT_FLAG_FS_MAPPING 6 /* filesystem extent mapping type */ |
7f3c74fb | 21 | |
a52d9a80 | 22 | struct extent_map { |
a52d9a80 | 23 | struct rb_node rb_node; |
d1310b2e CM |
24 | |
25 | /* all of these are in bytes */ | |
26 | u64 start; | |
27 | u64 len; | |
4e2f84e6 LB |
28 | u64 mod_start; |
29 | u64 mod_len; | |
ff5b7ee3 | 30 | u64 orig_start; |
b4939680 | 31 | u64 orig_block_len; |
cc95bef6 | 32 | u64 ram_bytes; |
a52d9a80 | 33 | u64 block_start; |
c8b97818 | 34 | u64 block_len; |
5dc562c5 | 35 | u64 generation; |
d1310b2e | 36 | unsigned long flags; |
95617d69 JM |
37 | union { |
38 | struct block_device *bdev; | |
39 | ||
40 | /* | |
41 | * used for chunk mappings | |
42 | * flags & EXTENT_FLAG_FS_MAPPING must be set | |
43 | */ | |
44 | struct map_lookup *map_lookup; | |
45 | }; | |
490b54d6 | 46 | refcount_t refs; |
c08782da | 47 | unsigned int compress_type; |
5dc562c5 | 48 | struct list_head list; |
a52d9a80 CM |
49 | }; |
50 | ||
d1310b2e CM |
51 | struct extent_map_tree { |
52 | struct rb_root map; | |
5dc562c5 | 53 | struct list_head modified_extents; |
890871be | 54 | rwlock_t lock; |
a52d9a80 CM |
55 | }; |
56 | ||
cbc0e928 FM |
57 | static inline int extent_map_in_tree(const struct extent_map *em) |
58 | { | |
59 | return !RB_EMPTY_NODE(&em->rb_node); | |
60 | } | |
61 | ||
d1310b2e CM |
62 | static inline u64 extent_map_end(struct extent_map *em) |
63 | { | |
64 | if (em->start + em->len < em->start) | |
65 | return (u64)-1; | |
66 | return em->start + em->len; | |
67 | } | |
68 | ||
69 | static inline u64 extent_map_block_end(struct extent_map *em) | |
70 | { | |
c8b97818 | 71 | if (em->block_start + em->block_len < em->block_start) |
d1310b2e | 72 | return (u64)-1; |
c8b97818 | 73 | return em->block_start + em->block_len; |
d1310b2e | 74 | } |
a52d9a80 | 75 | |
a8067e02 | 76 | void extent_map_tree_init(struct extent_map_tree *tree); |
a52d9a80 | 77 | struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree, |
d1310b2e | 78 | u64 start, u64 len); |
a52d9a80 | 79 | int add_extent_mapping(struct extent_map_tree *tree, |
09a2a8f9 | 80 | struct extent_map *em, int modified); |
a52d9a80 | 81 | int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em); |
176840b3 FM |
82 | void replace_extent_mapping(struct extent_map_tree *tree, |
83 | struct extent_map *cur, | |
84 | struct extent_map *new, | |
85 | int modified); | |
d1310b2e | 86 | |
172ddd60 | 87 | struct extent_map *alloc_extent_map(void); |
a52d9a80 | 88 | void free_extent_map(struct extent_map *em); |
2f4cbe64 | 89 | int __init extent_map_init(void); |
e67c718b | 90 | void __cold extent_map_exit(void); |
5dc562c5 | 91 | int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len, u64 gen); |
201a9038 | 92 | void clear_em_logging(struct extent_map_tree *tree, struct extent_map *em); |
b917b7c3 CM |
93 | struct extent_map *search_extent_mapping(struct extent_map_tree *tree, |
94 | u64 start, u64 len); | |
c04e61b5 LB |
95 | int btrfs_add_extent_mapping(struct extent_map_tree *em_tree, |
96 | struct extent_map **em_in, u64 start, u64 len); | |
9888c340 | 97 | |
a52d9a80 | 98 | #endif |