1 #ifndef __EXTENTMAP__ 2 #define __EXTENTMAP__ 3 4 #include <linux/rbtree.h> 5 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 10 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 */ 17 18 struct extent_map { 19 struct rb_node rb_node; 20 21 /* all of these are in bytes */ 22 u64 start; 23 u64 len; 24 u64 mod_start; 25 u64 mod_len; 26 u64 orig_start; 27 u64 block_start; 28 u64 block_len; 29 u64 generation; 30 unsigned long flags; 31 struct block_device *bdev; 32 atomic_t refs; 33 unsigned int in_tree; 34 unsigned int compress_type; 35 struct list_head list; 36 }; 37 38 struct extent_map_tree { 39 struct rb_root map; 40 struct list_head modified_extents; 41 rwlock_t lock; 42 }; 43 44 static inline u64 extent_map_end(struct extent_map *em) 45 { 46 if (em->start + em->len < em->start) 47 return (u64)-1; 48 return em->start + em->len; 49 } 50 51 static inline u64 extent_map_block_end(struct extent_map *em) 52 { 53 if (em->block_start + em->block_len < em->block_start) 54 return (u64)-1; 55 return em->block_start + em->block_len; 56 } 57 58 void extent_map_tree_init(struct extent_map_tree *tree); 59 struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree, 60 u64 start, u64 len); 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); 64 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, 71 u64 start, u64 len); 72 #endif 73