1 /* SPDX-License-Identifier: GPL-2.0 */
3 #ifndef BTRFS_EXTENT_MAP_H
4 #define BTRFS_EXTENT_MAP_H
6 #include <linux/rbtree.h>
7 #include <linux/refcount.h>
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)
14 /* bits for the extent_map::flags field */
16 /* this entry not yet on disk, don't free it */
18 EXTENT_FLAG_COMPRESSED,
19 /* pre-allocated extent */
21 /* Logging this extent */
23 /* Filling in a preallocated extent */
25 /* filesystem extent mapping type */
26 EXTENT_FLAG_FS_MAPPING,
30 struct rb_node rb_node;
32 /* all of these are in bytes */
45 struct block_device *bdev;
48 * used for chunk mappings
49 * flags & EXTENT_FLAG_FS_MAPPING must be set
51 struct map_lookup *map_lookup;
54 unsigned int compress_type;
55 struct list_head list;
58 struct extent_map_tree {
59 struct rb_root_cached map;
60 struct list_head modified_extents;
64 static inline int extent_map_in_tree(const struct extent_map *em)
66 return !RB_EMPTY_NODE(&em->rb_node);
69 static inline u64 extent_map_end(struct extent_map *em)
71 if (em->start + em->len < em->start)
73 return em->start + em->len;
76 static inline u64 extent_map_block_end(struct extent_map *em)
78 if (em->block_start + em->block_len < em->block_start)
80 return em->block_start + em->block_len;
83 void extent_map_tree_init(struct extent_map_tree *tree);
84 struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
86 int add_extent_mapping(struct extent_map_tree *tree,
87 struct extent_map *em, int modified);
88 void remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
89 void replace_extent_mapping(struct extent_map_tree *tree,
90 struct extent_map *cur,
91 struct extent_map *new,
94 struct extent_map *alloc_extent_map(void);
95 void free_extent_map(struct extent_map *em);
96 int __init extent_map_init(void);
97 void __cold extent_map_exit(void);
98 int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len, u64 gen);
99 void clear_em_logging(struct extent_map_tree *tree, struct extent_map *em);
100 struct extent_map *search_extent_mapping(struct extent_map_tree *tree,
102 int btrfs_add_extent_mapping(struct btrfs_fs_info *fs_info,
103 struct extent_map_tree *em_tree,
104 struct extent_map **em_in, u64 start, u64 len);