#ifndef __EXTENTMAP__ #define __EXTENTMAP__ #include <linux/rbtree.h> #define EXTENT_MAP_LAST_BYTE (u64)-4 #define EXTENT_MAP_HOLE (u64)-3 #define EXTENT_MAP_INLINE (u64)-2 #define EXTENT_MAP_DELALLOC (u64)-1 /* bits for the flags field */ #define EXTENT_FLAG_PINNED 0 /* this entry not yet on disk, don't free it */ #define EXTENT_FLAG_COMPRESSED 1 #define EXTENT_FLAG_VACANCY 2 /* no file extent item found */ #define EXTENT_FLAG_PREALLOC 3 /* pre-allocated extent */ struct extent_map { struct rb_node rb_node; /* all of these are in bytes */ u64 start; u64 len; u64 orig_start; u64 block_start; u64 block_len; unsigned long flags; struct block_device *bdev; atomic_t refs; int in_tree; }; struct extent_map_tree { struct rb_root map; rwlock_t lock; }; static inline u64 extent_map_end(struct extent_map *em) { if (em->start + em->len < em->start) return (u64)-1; return em->start + em->len; } static inline u64 extent_map_block_end(struct extent_map *em) { if (em->block_start + em->block_len < em->block_start) return (u64)-1; return em->block_start + em->block_len; } void extent_map_tree_init(struct extent_map_tree *tree, gfp_t mask); struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree, u64 start, u64 len); int add_extent_mapping(struct extent_map_tree *tree, struct extent_map *em); int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em); struct extent_map *alloc_extent_map(gfp_t mask); void free_extent_map(struct extent_map *em); int __init extent_map_init(void); void extent_map_exit(void); int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len); struct extent_map *search_extent_mapping(struct extent_map_tree *tree, u64 start, u64 len); #endif