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/* used only during fiemap calls */
 13#define EXTENT_MAP_DELALLOC ((u64)-1)
 14
 15/* bits for the extent_map::flags field */
 16enum {
 17	/* this entry not yet on disk, don't free it */
 18	EXTENT_FLAG_PINNED,
 19	EXTENT_FLAG_COMPRESSED,
 20	/* pre-allocated extent */
 21	EXTENT_FLAG_PREALLOC,
 22	/* Logging this extent */
 23	EXTENT_FLAG_LOGGING,
 24	/* Filling in a preallocated extent */
 25	EXTENT_FLAG_FILLING,
 26	/* filesystem extent mapping type */
 27	EXTENT_FLAG_FS_MAPPING,
 28};
 29
 30struct extent_map {
 31	struct rb_node rb_node;
 32
 33	/* all of these are in bytes */
 34	u64 start;
 35	u64 len;
 36	u64 mod_start;
 37	u64 mod_len;
 38	u64 orig_start;
 39	u64 orig_block_len;
 40	u64 ram_bytes;
 41	u64 block_start;
 42	u64 block_len;
 43	u64 generation;
 44	unsigned long flags;
 45	union {
 46		struct block_device *bdev;
 47
 48		/*
 49		 * used for chunk mappings
 50		 * flags & EXTENT_FLAG_FS_MAPPING must be set
 51		 */
 52		struct map_lookup *map_lookup;
 53	};
 54	refcount_t refs;
 55	unsigned int compress_type;
 56	struct list_head list;
 57};
 58
 59struct extent_map_tree {
 60	struct rb_root_cached map;
 61	struct list_head modified_extents;
 62	rwlock_t lock;
 63};
 64
 65static inline int extent_map_in_tree(const struct extent_map *em)
 66{
 67	return !RB_EMPTY_NODE(&em->rb_node);
 68}
 69
 70static inline u64 extent_map_end(struct extent_map *em)
 71{
 72	if (em->start + em->len < em->start)
 73		return (u64)-1;
 74	return em->start + em->len;
 75}
 76
 77static inline u64 extent_map_block_end(struct extent_map *em)
 78{
 79	if (em->block_start + em->block_len < em->block_start)
 80		return (u64)-1;
 81	return em->block_start + em->block_len;
 82}
 83
 84void extent_map_tree_init(struct extent_map_tree *tree);
 85struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
 86					 u64 start, u64 len);
 87int add_extent_mapping(struct extent_map_tree *tree,
 88		       struct extent_map *em, int modified);
 89void remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
 90void replace_extent_mapping(struct extent_map_tree *tree,
 91			    struct extent_map *cur,
 92			    struct extent_map *new,
 93			    int modified);
 94
 95struct extent_map *alloc_extent_map(void);
 96void free_extent_map(struct extent_map *em);
 97int __init extent_map_init(void);
 98void __cold extent_map_exit(void);
 99int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len, u64 gen);
100void clear_em_logging(struct extent_map_tree *tree, struct extent_map *em);
101struct extent_map *search_extent_mapping(struct extent_map_tree *tree,
102					 u64 start, u64 len);
103int btrfs_add_extent_mapping(struct btrfs_fs_info *fs_info,
104			     struct extent_map_tree *em_tree,
105			     struct extent_map **em_in, u64 start, u64 len);
106
107#endif