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) | |
951e05a9 | 12 | /* used only during fiemap calls */ |
e248e04e | 13 | #define EXTENT_MAP_DELALLOC ((u64)-1) |
a52d9a80 | 14 | |
50b5b602 DS |
15 | /* bits for the extent_map::flags field */ |
16 | enum { | |
17 | /* this entry not yet on disk, don't free it */ | |
18 | EXTENT_FLAG_PINNED, | |
19 | EXTENT_FLAG_COMPRESSED, | |
20 | /* pre-allocated extent */ | |
21 | EXTENT_FLAG_PREALLOC, | |
22 | /* Logging this extent */ | |
23 | EXTENT_FLAG_LOGGING, | |
24 | /* Filling in a preallocated extent */ | |
25 | EXTENT_FLAG_FILLING, | |
26 | /* filesystem extent mapping type */ | |
27 | EXTENT_FLAG_FS_MAPPING, | |
28 | }; | |
7f3c74fb | 29 | |
a52d9a80 | 30 | struct extent_map { |
a52d9a80 | 31 | struct rb_node rb_node; |
d1310b2e CM |
32 | |
33 | /* all of these are in bytes */ | |
34 | u64 start; | |
35 | u64 len; | |
4e2f84e6 LB |
36 | u64 mod_start; |
37 | u64 mod_len; | |
ff5b7ee3 | 38 | u64 orig_start; |
b4939680 | 39 | u64 orig_block_len; |
cc95bef6 | 40 | u64 ram_bytes; |
a52d9a80 | 41 | u64 block_start; |
c8b97818 | 42 | u64 block_len; |
5dc562c5 | 43 | u64 generation; |
d1310b2e | 44 | unsigned long flags; |
95617d69 JM |
45 | union { |
46 | struct block_device *bdev; | |
47 | ||
48 | /* | |
49 | * used for chunk mappings | |
50 | * flags & EXTENT_FLAG_FS_MAPPING must be set | |
51 | */ | |
52 | struct map_lookup *map_lookup; | |
53 | }; | |
490b54d6 | 54 | refcount_t refs; |
c08782da | 55 | unsigned int compress_type; |
5dc562c5 | 56 | struct list_head list; |
a52d9a80 CM |
57 | }; |
58 | ||
d1310b2e | 59 | struct extent_map_tree { |
07e1ce09 | 60 | struct rb_root_cached map; |
5dc562c5 | 61 | struct list_head modified_extents; |
890871be | 62 | rwlock_t lock; |
a52d9a80 CM |
63 | }; |
64 | ||
cbc0e928 FM |
65 | static inline int extent_map_in_tree(const struct extent_map *em) |
66 | { | |
67 | return !RB_EMPTY_NODE(&em->rb_node); | |
68 | } | |
69 | ||
d1310b2e CM |
70 | static inline u64 extent_map_end(struct extent_map *em) |
71 | { | |
72 | if (em->start + em->len < em->start) | |
73 | return (u64)-1; | |
74 | return em->start + em->len; | |
75 | } | |
76 | ||
77 | static inline u64 extent_map_block_end(struct extent_map *em) | |
78 | { | |
c8b97818 | 79 | if (em->block_start + em->block_len < em->block_start) |
d1310b2e | 80 | return (u64)-1; |
c8b97818 | 81 | return em->block_start + em->block_len; |
d1310b2e | 82 | } |
a52d9a80 | 83 | |
a8067e02 | 84 | void extent_map_tree_init(struct extent_map_tree *tree); |
a52d9a80 | 85 | struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree, |
d1310b2e | 86 | u64 start, u64 len); |
a52d9a80 | 87 | int add_extent_mapping(struct extent_map_tree *tree, |
09a2a8f9 | 88 | struct extent_map *em, int modified); |
c1766dd7 | 89 | void remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em); |
176840b3 FM |
90 | void replace_extent_mapping(struct extent_map_tree *tree, |
91 | struct extent_map *cur, | |
92 | struct extent_map *new, | |
93 | int modified); | |
d1310b2e | 94 | |
172ddd60 | 95 | struct extent_map *alloc_extent_map(void); |
a52d9a80 | 96 | void free_extent_map(struct extent_map *em); |
2f4cbe64 | 97 | int __init extent_map_init(void); |
e67c718b | 98 | void __cold extent_map_exit(void); |
5dc562c5 | 99 | int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len, u64 gen); |
201a9038 | 100 | void clear_em_logging(struct extent_map_tree *tree, struct extent_map *em); |
b917b7c3 CM |
101 | struct extent_map *search_extent_mapping(struct extent_map_tree *tree, |
102 | u64 start, u64 len); | |
f46b24c9 DS |
103 | int btrfs_add_extent_mapping(struct btrfs_fs_info *fs_info, |
104 | struct extent_map_tree *em_tree, | |
c04e61b5 | 105 | struct extent_map **em_in, u64 start, u64 len); |
9888c340 | 106 | |
a52d9a80 | 107 | #endif |