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 /* used only during fiemap calls */
13 #define EXTENT_MAP_DELALLOC ((u64)-1)
15 /* bits for the extent_map::flags field */
17 /* this entry not yet on disk, don't free it */
19 EXTENT_FLAG_COMPRESSED
,
20 /* pre-allocated extent */
22 /* Logging this extent */
24 /* Filling in a preallocated extent */
26 /* filesystem extent mapping type */
27 EXTENT_FLAG_FS_MAPPING
,
31 struct rb_node rb_node
;
33 /* all of these are in bytes */
46 struct block_device
*bdev
;
49 * used for chunk mappings
50 * flags & EXTENT_FLAG_FS_MAPPING must be set
52 struct map_lookup
*map_lookup
;
55 unsigned int compress_type
;
56 struct list_head list
;
59 struct extent_map_tree
{
60 struct rb_root_cached map
;
61 struct list_head modified_extents
;
65 static inline int extent_map_in_tree(const struct extent_map
*em
)
67 return !RB_EMPTY_NODE(&em
->rb_node
);
70 static inline u64
extent_map_end(struct extent_map
*em
)
72 if (em
->start
+ em
->len
< em
->start
)
74 return em
->start
+ em
->len
;
77 static inline u64
extent_map_block_end(struct extent_map
*em
)
79 if (em
->block_start
+ em
->block_len
< em
->block_start
)
81 return em
->block_start
+ em
->block_len
;
84 void extent_map_tree_init(struct extent_map_tree
*tree
);
85 struct extent_map
*lookup_extent_mapping(struct extent_map_tree
*tree
,
87 int add_extent_mapping(struct extent_map_tree
*tree
,
88 struct extent_map
*em
, int modified
);
89 void remove_extent_mapping(struct extent_map_tree
*tree
, struct extent_map
*em
);
90 void replace_extent_mapping(struct extent_map_tree
*tree
,
91 struct extent_map
*cur
,
92 struct extent_map
*new,
95 struct extent_map
*alloc_extent_map(void);
96 void free_extent_map(struct extent_map
*em
);
97 int __init
extent_map_init(void);
98 void __cold
extent_map_exit(void);
99 int unpin_extent_cache(struct extent_map_tree
*tree
, u64 start
, u64 len
, u64 gen
);
100 void clear_em_logging(struct extent_map_tree
*tree
, struct extent_map
*em
);
101 struct extent_map
*search_extent_mapping(struct extent_map_tree
*tree
,
103 int btrfs_add_extent_mapping(struct btrfs_fs_info
*fs_info
,
104 struct extent_map_tree
*em_tree
,
105 struct extent_map
**em_in
, u64 start
, u64 len
);