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/* SPDX-License-Identifier: GPL-2.0 */
 2
 3#ifndef BTRFS_EXTENT_MAP_H
 4#define BTRFS_EXTENT_MAP_H
 5
 6#include <linux/rbtree.h>
 7#include <linux/refcount.h>
 8
 9#define EXTENT_MAP_LAST_BYTE ((u64)-4)
10#define EXTENT_MAP_HOLE ((u64)-3)
11#define EXTENT_MAP_INLINE ((u64)-2)
12#define EXTENT_MAP_DELALLOC ((u64)-1)
13
14/* bits for the flags field */
15#define EXTENT_FLAG_PINNED 0 /* this entry not yet on disk, don't free it */
16#define EXTENT_FLAG_COMPRESSED 1
 
17#define EXTENT_FLAG_PREALLOC 3 /* pre-allocated extent */
18#define EXTENT_FLAG_LOGGING 4 /* Logging this extent */
19#define EXTENT_FLAG_FILLING 5 /* Filling in a preallocated extent */
20#define EXTENT_FLAG_FS_MAPPING 6 /* filesystem extent mapping type */
21
22struct extent_map {
23	struct rb_node rb_node;
24
25	/* all of these are in bytes */
26	u64 start;
27	u64 len;
28	u64 mod_start;
29	u64 mod_len;
30	u64 orig_start;
31	u64 orig_block_len;
32	u64 ram_bytes;
33	u64 block_start;
34	u64 block_len;
35	u64 generation;
36	unsigned long flags;
37	union {
38		struct block_device *bdev;
39
40		/*
41		 * used for chunk mappings
42		 * flags & EXTENT_FLAG_FS_MAPPING must be set
43		 */
44		struct map_lookup *map_lookup;
45	};
46	refcount_t refs;
47	unsigned int compress_type;
48	struct list_head list;
49};
50
51struct extent_map_tree {
52	struct rb_root map;
53	struct list_head modified_extents;
54	rwlock_t lock;
55};
56
57static inline int extent_map_in_tree(const struct extent_map *em)
58{
59	return !RB_EMPTY_NODE(&em->rb_node);
60}
61
62static inline u64 extent_map_end(struct extent_map *em)
63{
64	if (em->start + em->len < em->start)
65		return (u64)-1;
66	return em->start + em->len;
67}
68
69static inline u64 extent_map_block_end(struct extent_map *em)
70{
71	if (em->block_start + em->block_len < em->block_start)
72		return (u64)-1;
73	return em->block_start + em->block_len;
74}
75
76void extent_map_tree_init(struct extent_map_tree *tree);
77struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
78					 u64 start, u64 len);
79int add_extent_mapping(struct extent_map_tree *tree,
80		       struct extent_map *em, int modified);
81int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
82void replace_extent_mapping(struct extent_map_tree *tree,
83			    struct extent_map *cur,
84			    struct extent_map *new,
85			    int modified);
86
87struct extent_map *alloc_extent_map(void);
88void free_extent_map(struct extent_map *em);
89int __init extent_map_init(void);
90void __cold extent_map_exit(void);
91int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len, u64 gen);
92void clear_em_logging(struct extent_map_tree *tree, struct extent_map *em);
93struct extent_map *search_extent_mapping(struct extent_map_tree *tree,
94					 u64 start, u64 len);
95int btrfs_add_extent_mapping(struct extent_map_tree *em_tree,
96			     struct extent_map **em_in, u64 start, u64 len);
97
98#endif