4 #include <linux/rbtree.h>
6 /* bits for the extent state */
8 #define EXTENT_WRITEBACK (1 << 1)
9 #define EXTENT_UPTODATE (1 << 2)
10 #define EXTENT_LOCKED (1 << 3)
11 #define EXTENT_NEW (1 << 4)
12 #define EXTENT_DELALLOC (1 << 5)
13 #define EXTENT_DEFRAG (1 << 6)
14 #define EXTENT_DEFRAG_DONE (1 << 7)
15 #define EXTENT_BUFFER_FILLED (1 << 8)
16 #define EXTENT_CSUM (1 << 9)
17 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
20 * page->private values. Every page that is controlled by the extent
21 * map has page->private set to one.
23 #define EXTENT_PAGE_PRIVATE 1
24 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
28 struct extent_io_ops {
29 int (*fill_delalloc)(struct inode *inode, u64 start, u64 end);
30 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
31 int (*submit_bio_hook)(int rw, struct bio *bio);
32 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
33 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
34 struct extent_state *state);
35 void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
36 struct extent_state *state);
37 int (*set_bit_hook)(struct inode *inode, u64 start, u64 end,
38 unsigned long old, unsigned long bits);
39 int (*clear_bit_hook)(struct inode *inode, u64 start, u64 end,
40 unsigned long old, unsigned long bits);
43 struct extent_io_tree {
45 struct address_space *mapping;
48 struct extent_io_ops *ops;
50 struct list_head buffer_lru;
52 struct extent_state *last;
57 u64 end; /* inclusive */
58 struct rb_node rb_node;
59 struct extent_io_tree *tree;
64 /* for use by the FS */
67 struct list_head list;
70 struct extent_buffer {
75 unsigned long map_start;
76 unsigned long map_len;
77 struct page *first_page;
83 struct extent_map_tree;
85 static inline struct extent_state *extent_state_next(struct extent_state *state)
88 node = rb_next(&state->rb_node);
91 return rb_entry(node, struct extent_state, rb_node);
94 typedef struct extent_map *(get_extent_t)(struct inode *inode,
100 void extent_io_tree_init(struct extent_io_tree *tree,
101 struct address_space *mapping, gfp_t mask);
102 void extent_io_tree_empty_lru(struct extent_io_tree *tree);
103 int try_release_extent_mapping(struct extent_map_tree *map,
104 struct extent_io_tree *tree, struct page *page,
106 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
107 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
108 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
109 get_extent_t *get_extent);
110 int __init extent_io_init(void);
111 void extent_io_exit(void);
113 u64 count_range_bits(struct extent_io_tree *tree,
114 u64 *start, u64 search_end,
115 u64 max_bytes, unsigned long bits);
117 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
118 int bits, int filled);
119 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
120 int bits, gfp_t mask);
121 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
122 int bits, gfp_t mask);
123 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
125 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
127 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
129 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
131 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
133 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
134 u64 *start_ret, u64 *end_ret, int bits);
135 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
136 u64 start, int bits);
137 int extent_invalidatepage(struct extent_io_tree *tree,
138 struct page *page, unsigned long offset);
139 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
140 get_extent_t *get_extent,
141 struct writeback_control *wbc);
142 int extent_writepages(struct extent_io_tree *tree,
143 struct address_space *mapping,
144 get_extent_t *get_extent,
145 struct writeback_control *wbc);
146 int extent_readpages(struct extent_io_tree *tree,
147 struct address_space *mapping,
148 struct list_head *pages, unsigned nr_pages,
149 get_extent_t get_extent);
150 int extent_prepare_write(struct extent_io_tree *tree,
151 struct inode *inode, struct page *page,
152 unsigned from, unsigned to, get_extent_t *get_extent);
153 int extent_commit_write(struct extent_io_tree *tree,
154 struct inode *inode, struct page *page,
155 unsigned from, unsigned to);
156 sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
157 get_extent_t *get_extent);
158 int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
159 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
160 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
161 void set_page_extent_mapped(struct page *page);
163 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
164 u64 start, unsigned long len,
167 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
168 u64 start, unsigned long len,
170 void free_extent_buffer(struct extent_buffer *eb);
171 int read_extent_buffer_pages(struct extent_io_tree *tree,
172 struct extent_buffer *eb, u64 start, int wait,
173 get_extent_t *get_extent);
175 static inline void extent_buffer_get(struct extent_buffer *eb)
177 atomic_inc(&eb->refs);
180 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
183 void read_extent_buffer(struct extent_buffer *eb, void *dst,
186 void write_extent_buffer(struct extent_buffer *eb, const void *src,
187 unsigned long start, unsigned long len);
188 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
189 unsigned long dst_offset, unsigned long src_offset,
191 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
192 unsigned long src_offset, unsigned long len);
193 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
194 unsigned long src_offset, unsigned long len);
195 void memset_extent_buffer(struct extent_buffer *eb, char c,
196 unsigned long start, unsigned long len);
197 int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
198 struct extent_buffer *eb);
199 int clear_extent_buffer_dirty(struct extent_io_tree *tree,
200 struct extent_buffer *eb);
201 int set_extent_buffer_dirty(struct extent_io_tree *tree,
202 struct extent_buffer *eb);
203 int set_extent_buffer_uptodate(struct extent_io_tree *tree,
204 struct extent_buffer *eb);
205 int extent_buffer_uptodate(struct extent_io_tree *tree,
206 struct extent_buffer *eb);
207 int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
208 unsigned long min_len, char **token, char **map,
209 unsigned long *map_start,
210 unsigned long *map_len, int km);
211 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
212 unsigned long min_len, char **token, char **map,
213 unsigned long *map_start,
214 unsigned long *map_len, int km);
215 void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);