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_ORDERED (1 << 9)
17 #define EXTENT_ORDERED_METADATA (1 << 10)
18 #define EXTENT_BOUNDARY (1 << 11)
19 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
21 /* flags for bio submission */
22 #define EXTENT_BIO_COMPRESSED 1
25 * page->private values. Every page that is controlled by the extent
26 * map has page->private set to one.
28 #define EXTENT_PAGE_PRIVATE 1
29 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
33 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
34 struct bio *bio, int mirror_num,
35 unsigned long bio_flags);
36 struct extent_io_ops {
37 int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
38 u64 start, u64 end, int *page_started);
39 int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
40 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
41 extent_submit_bio_hook_t *submit_bio_hook;
42 int (*merge_bio_hook)(struct page *page, unsigned long offset,
43 size_t size, struct bio *bio,
44 unsigned long bio_flags);
45 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
46 int (*readpage_io_failed_hook)(struct bio *bio, struct page *page,
48 struct extent_state *state);
49 int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
51 struct extent_state *state);
52 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
53 struct extent_state *state);
54 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
55 struct extent_state *state, int uptodate);
56 int (*set_bit_hook)(struct inode *inode, u64 start, u64 end,
57 unsigned long old, unsigned long bits);
58 int (*clear_bit_hook)(struct inode *inode, u64 start, u64 end,
59 unsigned long old, unsigned long bits);
60 int (*write_cache_pages_lock_hook)(struct page *page);
63 struct extent_io_tree {
65 struct rb_root buffer;
66 struct address_space *mapping;
69 spinlock_t buffer_lock;
70 struct extent_io_ops *ops;
75 u64 end; /* inclusive */
76 struct rb_node rb_node;
77 struct extent_io_tree *tree;
82 /* for use by the FS */
85 struct list_head leak_list;
88 struct extent_buffer {
93 unsigned long map_start;
94 unsigned long map_len;
95 struct page *first_page;
98 struct list_head leak_list;
99 struct rb_node rb_node;
103 struct extent_map_tree;
105 static inline struct extent_state *extent_state_next(struct extent_state *state)
107 struct rb_node *node;
108 node = rb_next(&state->rb_node);
111 return rb_entry(node, struct extent_state, rb_node);
114 typedef struct extent_map *(get_extent_t)(struct inode *inode,
120 void extent_io_tree_init(struct extent_io_tree *tree,
121 struct address_space *mapping, gfp_t mask);
122 int try_release_extent_mapping(struct extent_map_tree *map,
123 struct extent_io_tree *tree, struct page *page,
125 int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
126 int try_release_extent_state(struct extent_map_tree *map,
127 struct extent_io_tree *tree, struct page *page,
129 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
130 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
131 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
133 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
134 get_extent_t *get_extent);
135 int __init extent_io_init(void);
136 void extent_io_exit(void);
138 u64 count_range_bits(struct extent_io_tree *tree,
139 u64 *start, u64 search_end,
140 u64 max_bytes, unsigned long bits);
142 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
143 int bits, int filled);
144 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
145 int bits, gfp_t mask);
146 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
147 int bits, int wake, int delete, gfp_t mask);
148 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
149 int bits, gfp_t mask);
150 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
152 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
154 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
156 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
158 int clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
160 int clear_extent_ordered_metadata(struct extent_io_tree *tree, u64 start,
161 u64 end, gfp_t mask);
162 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
164 int set_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
166 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
167 u64 *start_ret, u64 *end_ret, int bits);
168 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
169 u64 start, int bits);
170 int extent_invalidatepage(struct extent_io_tree *tree,
171 struct page *page, unsigned long offset);
172 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
173 get_extent_t *get_extent,
174 struct writeback_control *wbc);
175 int extent_writepages(struct extent_io_tree *tree,
176 struct address_space *mapping,
177 get_extent_t *get_extent,
178 struct writeback_control *wbc);
179 int extent_readpages(struct extent_io_tree *tree,
180 struct address_space *mapping,
181 struct list_head *pages, unsigned nr_pages,
182 get_extent_t get_extent);
183 int extent_prepare_write(struct extent_io_tree *tree,
184 struct inode *inode, struct page *page,
185 unsigned from, unsigned to, get_extent_t *get_extent);
186 int extent_commit_write(struct extent_io_tree *tree,
187 struct inode *inode, struct page *page,
188 unsigned from, unsigned to);
189 sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
190 get_extent_t *get_extent);
191 int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
192 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
193 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
194 void set_page_extent_mapped(struct page *page);
196 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
197 u64 start, unsigned long len,
200 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
201 u64 start, unsigned long len,
203 void free_extent_buffer(struct extent_buffer *eb);
204 int read_extent_buffer_pages(struct extent_io_tree *tree,
205 struct extent_buffer *eb, u64 start, int wait,
206 get_extent_t *get_extent, int mirror_num);
208 static inline void extent_buffer_get(struct extent_buffer *eb)
210 atomic_inc(&eb->refs);
213 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
216 void read_extent_buffer(struct extent_buffer *eb, void *dst,
219 void write_extent_buffer(struct extent_buffer *eb, const void *src,
220 unsigned long start, unsigned long len);
221 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
222 unsigned long dst_offset, unsigned long src_offset,
224 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
225 unsigned long src_offset, unsigned long len);
226 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
227 unsigned long src_offset, unsigned long len);
228 void memset_extent_buffer(struct extent_buffer *eb, char c,
229 unsigned long start, unsigned long len);
230 int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
231 struct extent_buffer *eb);
232 int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end);
233 int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
234 int clear_extent_buffer_dirty(struct extent_io_tree *tree,
235 struct extent_buffer *eb);
236 int set_extent_buffer_dirty(struct extent_io_tree *tree,
237 struct extent_buffer *eb);
238 int set_extent_buffer_uptodate(struct extent_io_tree *tree,
239 struct extent_buffer *eb);
240 int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
241 struct extent_buffer *eb);
242 int extent_buffer_uptodate(struct extent_io_tree *tree,
243 struct extent_buffer *eb);
244 int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
245 unsigned long min_len, char **token, char **map,
246 unsigned long *map_start,
247 unsigned long *map_len, int km);
248 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
249 unsigned long min_len, char **token, char **map,
250 unsigned long *map_start,
251 unsigned long *map_len, int km);
252 void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
253 int release_extent_buffer_tail_pages(struct extent_buffer *eb);
254 int extent_range_uptodate(struct extent_io_tree *tree,
256 int extent_clear_unlock_delalloc(struct inode *inode,
257 struct extent_io_tree *tree,
258 u64 start, u64 end, struct page *locked_page,
259 int clear_dirty, int set_writeback,
260 int clear_writeback);