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);
14 void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end);
17 struct extent_map_tree {
20 struct address_space *mapping;
22 struct extent_map_ops *ops;
25 /* note, this must start with the same fields as fs/extent_map.c:tree_entry */
28 u64 end; /* inclusive */
30 struct rb_node rb_node;
31 /* block_start and block_end are in bytes */
33 u64 block_end; /* inclusive */
34 struct block_device *bdev;
38 /* note, this must start with the same fields as fs/extent_map.c:tree_entry */
41 u64 end; /* inclusive */
43 struct rb_node rb_node;
48 /* for use by the FS */
51 struct list_head list;
54 struct extent_buffer {
56 u64 end; /* inclusive */
61 typedef struct extent_map *(get_extent_t)(struct inode *inode,
67 void extent_map_tree_init(struct extent_map_tree *tree,
68 struct address_space *mapping, gfp_t mask);
69 struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
71 int add_extent_mapping(struct extent_map_tree *tree,
72 struct extent_map *em);
73 int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
74 int try_release_extent_mapping(struct extent_map_tree *tree, struct page *page);
75 int lock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
76 int unlock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
77 struct extent_map *alloc_extent_map(gfp_t mask);
78 void free_extent_map(struct extent_map *em);
79 int extent_read_full_page(struct extent_map_tree *tree, struct page *page,
80 get_extent_t *get_extent);
81 void __init extent_map_init(void);
82 void __exit extent_map_exit(void);
83 int extent_clean_all_trees(struct extent_map_tree *tree);
84 int set_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end,
86 int set_extent_new(struct extent_map_tree *tree, u64 start, u64 end,
88 int set_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
90 int set_extent_delalloc(struct extent_map_tree *tree, u64 start, u64 end,
92 int extent_invalidatepage(struct extent_map_tree *tree,
93 struct page *page, unsigned long offset);
94 int extent_write_full_page(struct extent_map_tree *tree, struct page *page,
95 get_extent_t *get_extent,
96 struct writeback_control *wbc);
97 int extent_prepare_write(struct extent_map_tree *tree,
98 struct inode *inode, struct page *page,
99 unsigned from, unsigned to, get_extent_t *get_extent);
100 int extent_commit_write(struct extent_map_tree *tree,
101 struct inode *inode, struct page *page,
102 unsigned from, unsigned to);
103 sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
104 get_extent_t *get_extent);
105 int set_range_dirty(struct extent_map_tree *tree, u64 start, u64 end);
106 int set_state_private(struct extent_map_tree *tree, u64 start, u64 private);
107 int get_state_private(struct extent_map_tree *tree, u64 start, u64 *private);
108 void set_page_extent_mapped(struct page *page);