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 #define EXTENT_FLAG_FILLING 5 /* Filling in a preallocated extent */ 18 19 struct extent_map { 20 struct rb_node rb_node; 21 22 /* all of these are in bytes */ 23 u64 start; 24 u64 len; 25 u64 mod_start; 26 u64 mod_len; 27 u64 orig_start; 28 u64 orig_block_len; 29 u64 block_start; 30 u64 block_len; 31 u64 generation; 32 unsigned long flags; 33 struct block_device *bdev; 34 atomic_t refs; 35 unsigned int in_tree; 36 unsigned int compress_type; 37 struct list_head list; 38 }; 39 40 struct extent_map_tree { 41 struct rb_root map; 42 struct list_head modified_extents; 43 rwlock_t lock; 44 }; 45 46 static inline u64 extent_map_end(struct extent_map *em) 47 { 48 if (em->start + em->len < em->start) 49 return (u64)-1; 50 return em->start + em->len; 51 } 52 53 static inline u64 extent_map_block_end(struct extent_map *em) 54 { 55 if (em->block_start + em->block_len < em->block_start) 56 return (u64)-1; 57 return em->block_start + em->block_len; 58 } 59 60 void extent_map_tree_init(struct extent_map_tree *tree); 61 struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree, 62 u64 start, u64 len); 63 int add_extent_mapping(struct extent_map_tree *tree, 64 struct extent_map *em); 65 int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em); 66 67 struct extent_map *alloc_extent_map(void); 68 void free_extent_map(struct extent_map *em); 69 int __init extent_map_init(void); 70 void extent_map_exit(void); 71 int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len, u64 gen); 72 void clear_em_logging(struct extent_map_tree *tree, struct extent_map *em); 73 struct extent_map *search_extent_mapping(struct extent_map_tree *tree, 74 u64 start, u64 len); 75 #endif 76