4 #include <linux/rbtree.h>
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
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 #define EXTENT_FLAG_LOGGING 4 /* Logging this extent */
19 struct rb_node rb_node
;
21 /* all of these are in bytes */
31 struct block_device
*bdev
;
34 unsigned int compress_type
;
35 struct list_head list
;
38 struct extent_map_tree
{
40 struct list_head modified_extents
;
44 static inline u64
extent_map_end(struct extent_map
*em
)
46 if (em
->start
+ em
->len
< em
->start
)
48 return em
->start
+ em
->len
;
51 static inline u64
extent_map_block_end(struct extent_map
*em
)
53 if (em
->block_start
+ em
->block_len
< em
->block_start
)
55 return em
->block_start
+ em
->block_len
;
58 void extent_map_tree_init(struct extent_map_tree
*tree
);
59 struct extent_map
*lookup_extent_mapping(struct extent_map_tree
*tree
,
61 int add_extent_mapping(struct extent_map_tree
*tree
,
62 struct extent_map
*em
);
63 int remove_extent_mapping(struct extent_map_tree
*tree
, struct extent_map
*em
);
65 struct extent_map
*alloc_extent_map(void);
66 void free_extent_map(struct extent_map
*em
);
67 int __init
extent_map_init(void);
68 void extent_map_exit(void);
69 int unpin_extent_cache(struct extent_map_tree
*tree
, u64 start
, u64 len
, u64 gen
);
70 struct extent_map
*search_extent_mapping(struct extent_map_tree
*tree
,