[net-next-2.6.git] / fs / btrfs / extent_map.h

#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
Commit	Line	Data
	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	rwlock_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	int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len);
	63	struct extent_map search_extent_mapping(struct extent_map_tree tree,
	64	u64 start, u64 len);
	65	#endif