]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - fs/btrfs/extent_map.h
Merge branches 'pm-cpuidle', 'pm-cpufreq', 'pm-domains' and 'pm-sleep'
[mirror_ubuntu-artful-kernel.git] / fs / btrfs / extent_map.h
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 #define EXTENT_FLAG_FS_MAPPING 6 /* filesystem extent mapping type */
19
20 struct extent_map {
21 struct rb_node rb_node;
22
23 /* all of these are in bytes */
24 u64 start;
25 u64 len;
26 u64 mod_start;
27 u64 mod_len;
28 u64 orig_start;
29 u64 orig_block_len;
30 u64 ram_bytes;
31 u64 block_start;
32 u64 block_len;
33 u64 generation;
34 unsigned long flags;
35 union {
36 struct block_device *bdev;
37
38 /*
39 * used for chunk mappings
40 * flags & EXTENT_FLAG_FS_MAPPING must be set
41 */
42 struct map_lookup *map_lookup;
43 };
44 atomic_t refs;
45 unsigned int compress_type;
46 struct list_head list;
47 };
48
49 struct extent_map_tree {
50 struct rb_root map;
51 struct list_head modified_extents;
52 rwlock_t lock;
53 };
54
55 static inline int extent_map_in_tree(const struct extent_map *em)
56 {
57 return !RB_EMPTY_NODE(&em->rb_node);
58 }
59
60 static inline u64 extent_map_end(struct extent_map *em)
61 {
62 if (em->start + em->len < em->start)
63 return (u64)-1;
64 return em->start + em->len;
65 }
66
67 static inline u64 extent_map_block_end(struct extent_map *em)
68 {
69 if (em->block_start + em->block_len < em->block_start)
70 return (u64)-1;
71 return em->block_start + em->block_len;
72 }
73
74 void extent_map_tree_init(struct extent_map_tree *tree);
75 struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
76 u64 start, u64 len);
77 int add_extent_mapping(struct extent_map_tree *tree,
78 struct extent_map *em, int modified);
79 int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
80 void replace_extent_mapping(struct extent_map_tree *tree,
81 struct extent_map *cur,
82 struct extent_map *new,
83 int modified);
84
85 struct extent_map *alloc_extent_map(void);
86 void free_extent_map(struct extent_map *em);
87 int __init extent_map_init(void);
88 void extent_map_exit(void);
89 int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len, u64 gen);
90 void clear_em_logging(struct extent_map_tree *tree, struct extent_map *em);
91 struct extent_map *search_extent_mapping(struct extent_map_tree *tree,
92 u64 start, u64 len);
93 #endif