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_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
19 * page->private values. Every page that is controlled by the extent
20 * map has page->private set to one.
22 #define EXTENT_PAGE_PRIVATE 1
23 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
27 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
28 struct bio *bio, int mirror_num);
29 struct extent_io_ops {
30 int (*fill_delalloc)(struct inode *inode, u64 start, u64 end);
31 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
32 extent_submit_bio_hook_t *submit_bio_hook;
33 int (*merge_bio_hook)(struct page *page, unsigned long offset,
34 size_t size, struct bio *bio);
35 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
36 int (*readpage_io_failed_hook)(struct bio *bio, struct page *page,
38 struct extent_state *state);
39 int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
41 struct extent_state *state);
42 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
43 struct extent_state *state);
44 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
45 struct extent_state *state);
46 int (*set_bit_hook)(struct inode *inode, u64 start, u64 end,
47 unsigned long old, unsigned long bits);
48 int (*clear_bit_hook)(struct inode *inode, u64 start, u64 end,
49 unsigned long old, unsigned long bits);
52 struct extent_io_tree {
54 struct address_space *mapping;
57 struct extent_io_ops *ops;
59 struct list_head buffer_lru;
61 struct extent_state *last;
66 u64 end; /* inclusive */
67 struct rb_node rb_node;
68 struct extent_io_tree *tree;
73 /* for use by the FS */
76 struct list_head leak_list;
79 struct extent_buffer {
84 unsigned long map_start;
85 unsigned long map_len;
86 struct page *first_page;
90 struct list_head leak_list;
93 struct extent_map_tree;
95 static inline struct extent_state *extent_state_next(struct extent_state *state)
98 node = rb_next(&state->rb_node);
101 return rb_entry(node, struct extent_state, rb_node);
104 typedef struct extent_map *(get_extent_t)(struct inode *inode,
110 void extent_io_tree_init(struct extent_io_tree *tree,
111 struct address_space *mapping, gfp_t mask);
112 void extent_io_tree_empty_lru(struct extent_io_tree *tree);
113 int try_release_extent_mapping(struct extent_map_tree *map,
114 struct extent_io_tree *tree, struct page *page,
116 int try_release_extent_state(struct extent_map_tree *map,
117 struct extent_io_tree *tree, struct page *page,
119 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
120 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
121 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
122 get_extent_t *get_extent);
123 int __init extent_io_init(void);
124 void extent_io_exit(void);
126 u64 count_range_bits(struct extent_io_tree *tree,
127 u64 *start, u64 search_end,
128 u64 max_bytes, unsigned long bits);
130 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
131 int bits, int filled);
132 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
133 int bits, gfp_t mask);
134 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
135 int bits, gfp_t mask);
136 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
138 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
140 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
142 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
144 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
146 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
147 u64 *start_ret, u64 *end_ret, int bits);
148 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
149 u64 start, int bits);
150 int extent_invalidatepage(struct extent_io_tree *tree,
151 struct page *page, unsigned long offset);
152 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
153 get_extent_t *get_extent,
154 struct writeback_control *wbc);
155 int extent_writepages(struct extent_io_tree *tree,
156 struct address_space *mapping,
157 get_extent_t *get_extent,
158 struct writeback_control *wbc);
159 int extent_readpages(struct extent_io_tree *tree,
160 struct address_space *mapping,
161 struct list_head *pages, unsigned nr_pages,
162 get_extent_t get_extent);
163 int extent_prepare_write(struct extent_io_tree *tree,
164 struct inode *inode, struct page *page,
165 unsigned from, unsigned to, get_extent_t *get_extent);
166 int extent_commit_write(struct extent_io_tree *tree,
167 struct inode *inode, struct page *page,
168 unsigned from, unsigned to);
169 sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
170 get_extent_t *get_extent);
171 int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
172 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
173 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
174 void set_page_extent_mapped(struct page *page);
176 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
177 u64 start, unsigned long len,
180 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
181 u64 start, unsigned long len,
183 void free_extent_buffer(struct extent_buffer *eb);
184 int read_extent_buffer_pages(struct extent_io_tree *tree,
185 struct extent_buffer *eb, u64 start, int wait,
186 get_extent_t *get_extent, int mirror_num);
188 static inline void extent_buffer_get(struct extent_buffer *eb)
190 atomic_inc(&eb->refs);
193 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
196 void read_extent_buffer(struct extent_buffer *eb, void *dst,
199 void write_extent_buffer(struct extent_buffer *eb, const void *src,
200 unsigned long start, unsigned long len);
201 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
202 unsigned long dst_offset, unsigned long src_offset,
204 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
205 unsigned long src_offset, unsigned long len);
206 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
207 unsigned long src_offset, unsigned long len);
208 void memset_extent_buffer(struct extent_buffer *eb, char c,
209 unsigned long start, unsigned long len);
210 int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
211 struct extent_buffer *eb);
212 int clear_extent_buffer_dirty(struct extent_io_tree *tree,
213 struct extent_buffer *eb);
214 int set_extent_buffer_dirty(struct extent_io_tree *tree,
215 struct extent_buffer *eb);
216 int set_extent_buffer_uptodate(struct extent_io_tree *tree,
217 struct extent_buffer *eb);
218 int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
219 struct extent_buffer *eb);
220 int extent_buffer_uptodate(struct extent_io_tree *tree,
221 struct extent_buffer *eb);
222 int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
223 unsigned long min_len, char **token, char **map,
224 unsigned long *map_start,
225 unsigned long *map_len, int km);
226 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
227 unsigned long min_len, char **token, char **map,
228 unsigned long *map_start,
229 unsigned long *map_len, int km);
230 void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
231 int invalidate_extent_lru(struct extent_io_tree *tree, u64 start,
233 int release_extent_buffer_tail_pages(struct extent_buffer *eb);
234 int extent_range_uptodate(struct extent_io_tree *tree,