[mirror_ubuntu-artful-kernel.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 */
#define EXTENT_FLAG_LOGGING 4 /* Logging this extent */
#define EXTENT_FLAG_FILLING 5 /* Filling in a preallocated extent */

struct extent_map {
	struct rb_node rb_node;

	/* all of these are in bytes */
	u64 start;
	u64 len;
	u64 mod_start;
	u64 mod_len;
	u64 orig_start;
	u64 orig_block_len;
	u64 block_start;
	u64 block_len;
	u64 generation;
	unsigned long flags;
	struct block_device *bdev;
	atomic_t refs;
	unsigned int in_tree;
	unsigned int compress_type;
	struct list_head list;
};

struct extent_map_tree {
	struct rb_root map;
	struct list_head modified_extents;
	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);
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(void);
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, u64 gen);
void clear_em_logging(struct extent_map_tree *tree, struct extent_map *em);
struct extent_map *search_extent_mapping(struct extent_map_tree *tree,
					 u64 start, u64 len);
#endif
Commit	Line	Data
a52d9a80 CM	1	#ifndef __EXTENTMAP__
	2	#define __EXTENTMAP__
	3
	4	#include <linux/rbtree.h>
	5
d1310b2e	6	#define EXTENT_MAP_LAST_BYTE (u64)-4
5f39d397	7	#define EXTENT_MAP_HOLE (u64)-3
a52d9a80 CM	8	#define EXTENT_MAP_INLINE (u64)-2
	9	#define EXTENT_MAP_DELALLOC (u64)-1
	10
7f3c74fb CM	11	/* bits for the flags field */
7f3c74fb CM	12	#define EXTENT_FLAG_PINNED 0 /* this entry not yet on disk, don't free it */
c8b97818	13	#define EXTENT_FLAG_COMPRESSED 1
9036c102	14	#define EXTENT_FLAG_VACANCY 2 /* no file extent item found */
d899e052	15	#define EXTENT_FLAG_PREALLOC 3 /* pre-allocated extent */
ff44c6e3	16	#define EXTENT_FLAG_LOGGING 4 /* Logging this extent */
b11e234d	17	#define EXTENT_FLAG_FILLING 5 /* Filling in a preallocated extent */
7f3c74fb	18
a52d9a80	19	struct extent_map {
a52d9a80	20	struct rb_node rb_node;
d1310b2e CM	21
	22	/* all of these are in bytes */
	23	u64 start;
	24	u64 len;
4e2f84e6 LB	25	u64 mod_start;
4e2f84e6 LB	26	u64 mod_len;
ff5b7ee3	27	u64 orig_start;
b4939680	28	u64 orig_block_len;
a52d9a80	29	u64 block_start;
c8b97818	30	u64 block_len;
5dc562c5	31	u64 generation;
d1310b2e	32	unsigned long flags;
a52d9a80 CM	33	struct block_device *bdev;
a52d9a80 CM	34	atomic_t refs;
c08782da DS	35	unsigned int in_tree;
c08782da DS	36	unsigned int compress_type;
5dc562c5	37	struct list_head list;
a52d9a80 CM	38	};
a52d9a80 CM	39
d1310b2e CM	40	struct extent_map_tree {
d1310b2e CM	41	struct rb_root map;
5dc562c5	42	struct list_head modified_extents;
890871be	43	rwlock_t lock;
a52d9a80 CM	44	};
a52d9a80 CM	45
d1310b2e CM	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	{
c8b97818	55	if (em->block_start + em->block_len < em->block_start)
d1310b2e	56	return (u64)-1;
c8b97818	57	return em->block_start + em->block_len;
d1310b2e	58	}
a52d9a80	59
a8067e02	60	void extent_map_tree_init(struct extent_map_tree *tree);
a52d9a80	61	struct extent_map lookup_extent_mapping(struct extent_map_tree tree,
d1310b2e	62	u64 start, u64 len);
a52d9a80 CM	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);
d1310b2e	66
172ddd60	67	struct extent_map *alloc_extent_map(void);
a52d9a80	68	void free_extent_map(struct extent_map *em);
2f4cbe64	69	int __init extent_map_init(void);
17636e03	70	void extent_map_exit(void);
5dc562c5	71	int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len, u64 gen);
201a9038	72	void clear_em_logging(struct extent_map_tree tree, struct extent_map em);
b917b7c3 CM	73	struct extent_map search_extent_mapping(struct extent_map_tree tree,
b917b7c3 CM	74	u64 start, u64 len);
a52d9a80	75	#endif