blob: e91a2e9619eeb6caa3c5cfd73cb1130deaf359df [file] [log] [blame]
Chris Masona52d9a82007-08-27 16:49:44 -04001#ifndef __EXTENTMAP__
2#define __EXTENTMAP__
3
4#include <linux/rbtree.h>
5
6#define EXTENT_MAP_INLINE (u64)-2
7#define EXTENT_MAP_DELALLOC (u64)-1
8
9struct extent_map_tree {
10 struct rb_root map;
11 struct rb_root state;
12 struct address_space *mapping;
13 rwlock_t lock;
Chris Masonb888db22007-08-27 16:49:44 -040014 int (*fill_delalloc)(struct inode *inode, u64 start, u64 end);
Chris Masona52d9a82007-08-27 16:49:44 -040015};
16
17/* note, this must start with the same fields as fs/extent_map.c:tree_entry */
18struct extent_map {
19 u64 start;
20 u64 end; /* inclusive */
21 int in_tree;
22 struct rb_node rb_node;
23 /* block_start and block_end are in bytes */
24 u64 block_start;
25 u64 block_end; /* inclusive */
26 struct block_device *bdev;
27 atomic_t refs;
28};
29
30/* note, this must start with the same fields as fs/extent_map.c:tree_entry */
31struct extent_state {
32 u64 start;
33 u64 end; /* inclusive */
34 int in_tree;
35 struct rb_node rb_node;
36 wait_queue_head_t wq;
37 atomic_t refs;
38 unsigned long state;
39 struct list_head list;
40};
41
42struct extent_buffer {
43 u64 start;
44 u64 end; /* inclusive */
45 char *addr;
46 struct page *pages[];
47};
48
49typedef struct extent_map *(get_extent_t)(struct inode *inode,
50 struct page *page,
51 size_t page_offset,
52 u64 start, u64 end,
53 int create);
54
55void extent_map_tree_init(struct extent_map_tree *tree,
56 struct address_space *mapping, gfp_t mask);
57struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
58 u64 start, u64 end);
59int add_extent_mapping(struct extent_map_tree *tree,
60 struct extent_map *em);
61int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
62int try_release_extent_mapping(struct extent_map_tree *tree, struct page *page);
63int lock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
64int unlock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
65struct extent_map *alloc_extent_map(gfp_t mask);
66void free_extent_map(struct extent_map *em);
67int extent_read_full_page(struct extent_map_tree *tree, struct page *page,
68 get_extent_t *get_extent);
69void __init extent_map_init(void);
70void __exit extent_map_exit(void);
71int extent_clean_all_trees(struct extent_map_tree *tree);
72int set_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end,
73 gfp_t mask);
74int set_extent_new(struct extent_map_tree *tree, u64 start, u64 end,
75 gfp_t mask);
76int set_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
77 gfp_t mask);
Chris Masonb888db22007-08-27 16:49:44 -040078int set_extent_delalloc(struct extent_map_tree *tree, u64 start, u64 end,
79 gfp_t mask);
Chris Masona52d9a82007-08-27 16:49:44 -040080int extent_invalidatepage(struct extent_map_tree *tree,
81 struct page *page, unsigned long offset);
82int extent_write_full_page(struct extent_map_tree *tree, struct page *page,
83 get_extent_t *get_extent,
84 struct writeback_control *wbc);
85int extent_prepare_write(struct extent_map_tree *tree,
86 struct inode *inode, struct page *page,
87 unsigned from, unsigned to, get_extent_t *get_extent);
88int extent_commit_write(struct extent_map_tree *tree,
89 struct inode *inode, struct page *page,
90 unsigned from, unsigned to);
91int set_range_dirty(struct extent_map_tree *tree, u64 start, u64 end);
92#endif