4 #include <linux/rbtree.h>
6 #define EXTENT_MAP_INLINE (u64)-2
7 #define EXTENT_MAP_DELALLOC (u64)-1
9 struct extent_map_ops {
10 int (*fill_delalloc)(struct inode *inode, u64 start, u64 end);
11 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
12 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
13 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end);
16 struct extent_map_tree {
19 struct address_space *mapping;
21 struct extent_map_ops *ops;
24 /* note, this must start with the same fields as fs/extent_map.c:tree_entry */
27 u64 end; /* inclusive */
29 struct rb_node rb_node;
30 /* block_start and block_end are in bytes */
32 u64 block_end; /* inclusive */
33 struct block_device *bdev;
37 /* note, this must start with the same fields as fs/extent_map.c:tree_entry */
40 u64 end; /* inclusive */
42 struct rb_node rb_node;
47 /* for use by the FS */
50 struct list_head list;
53 struct extent_buffer {
55 u64 end; /* inclusive */
60 typedef struct extent_map *(get_extent_t)(struct inode *inode,
66 void extent_map_tree_init(struct extent_map_tree *tree,
67 struct address_space *mapping, gfp_t mask);
68 struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
70 int add_extent_mapping(struct extent_map_tree *tree,
71 struct extent_map *em);
72 int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
73 int try_release_extent_mapping(struct extent_map_tree *tree, struct page *page);
74 int lock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
75 int unlock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
76 struct extent_map *alloc_extent_map(gfp_t mask);
77 void free_extent_map(struct extent_map *em);
78 int extent_read_full_page(struct extent_map_tree *tree, struct page *page,
79 get_extent_t *get_extent);
80 void __init extent_map_init(void);
81 void __exit extent_map_exit(void);
82 int extent_clean_all_trees(struct extent_map_tree *tree);
83 int set_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end,
85 int set_extent_new(struct extent_map_tree *tree, u64 start, u64 end,
87 int set_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
89 int set_extent_delalloc(struct extent_map_tree *tree, u64 start, u64 end,
91 int extent_invalidatepage(struct extent_map_tree *tree,
92 struct page *page, unsigned long offset);
93 int extent_write_full_page(struct extent_map_tree *tree, struct page *page,
94 get_extent_t *get_extent,
95 struct writeback_control *wbc);
96 int extent_prepare_write(struct extent_map_tree *tree,
97 struct inode *inode, struct page *page,
98 unsigned from, unsigned to, get_extent_t *get_extent);
99 int extent_commit_write(struct extent_map_tree *tree,
100 struct inode *inode, struct page *page,
101 unsigned from, unsigned to);
102 sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
103 get_extent_t *get_extent);
104 int set_range_dirty(struct extent_map_tree *tree, u64 start, u64 end);
105 int set_state_private(struct extent_map_tree *tree, u64 start, u64 private);
106 int get_state_private(struct extent_map_tree *tree, u64 start, u64 *private);