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 17 struct extent_map { 18 struct rb_node rb_node; 19 20 /* all of these are in bytes */ 21 u64 start; 22 u64 len; 23 u64 orig_start; 24 u64 block_start; 25 u64 block_len; 26 unsigned long flags; 27 struct block_device *bdev; 28 atomic_t refs; 29 int in_tree; 30 }; 31 32 struct extent_map_tree { 33 struct rb_root map; 34 spinlock_t lock; 35 }; 36 37 static inline u64 extent_map_end(struct extent_map *em) 38 { 39 if (em->start + em->len < em->start) 40 return (u64)-1; 41 return em->start + em->len; 42 } 43 44 static inline u64 extent_map_block_end(struct extent_map *em) 45 { 46 if (em->block_start + em->block_len < em->block_start) 47 return (u64)-1; 48 return em->block_start + em->block_len; 49 } 50 51 void extent_map_tree_init(struct extent_map_tree *tree, gfp_t mask); 52 struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree, 53 u64 start, u64 len); 54 int add_extent_mapping(struct extent_map_tree *tree, 55 struct extent_map *em); 56 int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em); 57 58 struct extent_map *alloc_extent_map(gfp_t mask); 59 void free_extent_map(struct extent_map *em); 60 int __init extent_map_init(void); 61 void extent_map_exit(void); 62 #endif 63