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
17struct 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	unsigned int in_tree:1;
30	unsigned int compress_type:4;
31};
32
33struct extent_map_tree {
34	struct rb_root map;
 
35	rwlock_t lock;
36};
37
 
 
 
 
 
38static inline u64 extent_map_end(struct extent_map *em)
39{
40	if (em->start + em->len < em->start)
41		return (u64)-1;
42	return em->start + em->len;
43}
44
45static inline u64 extent_map_block_end(struct extent_map *em)
46{
47	if (em->block_start + em->block_len < em->block_start)
48		return (u64)-1;
49	return em->block_start + em->block_len;
50}
51
52void extent_map_tree_init(struct extent_map_tree *tree);
53struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
54					 u64 start, u64 len);
55int add_extent_mapping(struct extent_map_tree *tree,
56		       struct extent_map *em);
57int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
 
 
 
 
58
59struct extent_map *alloc_extent_map(void);
60void free_extent_map(struct extent_map *em);
61int __init extent_map_init(void);
62void extent_map_exit(void);
63int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len);
 
64struct extent_map *search_extent_mapping(struct extent_map_tree *tree,
65					 u64 start, u64 len);
66#endif

 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
19struct 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 ram_bytes;
30	u64 block_start;
31	u64 block_len;
32	u64 generation;
33	unsigned long flags;
34	struct block_device *bdev;
35	atomic_t refs;
36	unsigned int compress_type;
37	struct list_head list;
38};
39
40struct extent_map_tree {
41	struct rb_root map;
42	struct list_head modified_extents;
43	rwlock_t lock;
44};
45
46static inline int extent_map_in_tree(const struct extent_map *em)
47{
48	return !RB_EMPTY_NODE(&em->rb_node);
49}
50
51static inline u64 extent_map_end(struct extent_map *em)
52{
53	if (em->start + em->len < em->start)
54		return (u64)-1;
55	return em->start + em->len;
56}
57
58static inline u64 extent_map_block_end(struct extent_map *em)
59{
60	if (em->block_start + em->block_len < em->block_start)
61		return (u64)-1;
62	return em->block_start + em->block_len;
63}
64
65void extent_map_tree_init(struct extent_map_tree *tree);
66struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
67					 u64 start, u64 len);
68int add_extent_mapping(struct extent_map_tree *tree,
69		       struct extent_map *em, int modified);
70int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
71void replace_extent_mapping(struct extent_map_tree *tree,
72			    struct extent_map *cur,
73			    struct extent_map *new,
74			    int modified);
75
76struct extent_map *alloc_extent_map(void);
77void free_extent_map(struct extent_map *em);
78int __init extent_map_init(void);
79void extent_map_exit(void);
80int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len, u64 gen);
81void clear_em_logging(struct extent_map_tree *tree, struct extent_map *em);
82struct extent_map *search_extent_mapping(struct extent_map_tree *tree,
83					 u64 start, u64 len);
84#endif