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_BOUNDARY (1 << 9)
17 #define EXTENT_NODATASUM (1 << 10)
18 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
20 /* flags for bio submission */
21 #define EXTENT_BIO_COMPRESSED 1
23 /* these are bit numbers for test/set bit */
24 #define EXTENT_BUFFER_UPTODATE 0
25 #define EXTENT_BUFFER_BLOCKING 1
26 #define EXTENT_BUFFER_DIRTY 2
28 /* these are flags for extent_clear_unlock_delalloc */
29 #define EXTENT_CLEAR_UNLOCK_PAGE 0x1
30 #define EXTENT_CLEAR_UNLOCK 0x2
31 #define EXTENT_CLEAR_DELALLOC 0x4
32 #define EXTENT_CLEAR_DIRTY 0x8
33 #define EXTENT_SET_WRITEBACK 0x10
34 #define EXTENT_END_WRITEBACK 0x20
35 #define EXTENT_SET_PRIVATE2 0x40
38 * page->private values. Every page that is controlled by the extent
39 * map has page->private set to one.
41 #define EXTENT_PAGE_PRIVATE 1
42 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
46 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
47 struct bio *bio, int mirror_num,
48 unsigned long bio_flags);
49 struct extent_io_ops {
50 int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
51 u64 start, u64 end, int *page_started,
52 unsigned long *nr_written);
53 int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
54 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
55 extent_submit_bio_hook_t *submit_bio_hook;
56 int (*merge_bio_hook)(struct page *page, unsigned long offset,
57 size_t size, struct bio *bio,
58 unsigned long bio_flags);
59 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
60 int (*readpage_io_failed_hook)(struct bio *bio, struct page *page,
62 struct extent_state *state);
63 int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
65 struct extent_state *state);
66 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
67 struct extent_state *state);
68 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
69 struct extent_state *state, int uptodate);
70 int (*set_bit_hook)(struct inode *inode, u64 start, u64 end,
71 unsigned long old, unsigned long bits);
72 int (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
74 int (*merge_extent_hook)(struct inode *inode,
75 struct extent_state *new,
76 struct extent_state *other);
77 int (*split_extent_hook)(struct inode *inode,
78 struct extent_state *orig, u64 split);
79 int (*write_cache_pages_lock_hook)(struct page *page);
82 struct extent_io_tree {
84 struct rb_root buffer;
85 struct address_space *mapping;
88 spinlock_t buffer_lock;
89 struct extent_io_ops *ops;
94 u64 end; /* inclusive */
95 struct rb_node rb_node;
97 /* ADD NEW ELEMENTS AFTER THIS */
98 struct extent_io_tree *tree;
105 /* for use by the FS */
108 struct list_head leak_list;
111 struct extent_buffer {
116 unsigned long map_start;
117 unsigned long map_len;
118 struct page *first_page;
119 unsigned long bflags;
121 struct list_head leak_list;
122 struct rb_node rb_node;
124 /* the spinlock is used to protect most operations */
128 * when we keep the lock held while blocking, waiters go onto
131 wait_queue_head_t lock_wq;
134 struct extent_map_tree;
136 static inline struct extent_state *extent_state_next(struct extent_state *state)
138 struct rb_node *node;
139 node = rb_next(&state->rb_node);
142 return rb_entry(node, struct extent_state, rb_node);
145 typedef struct extent_map *(get_extent_t)(struct inode *inode,
151 void extent_io_tree_init(struct extent_io_tree *tree,
152 struct address_space *mapping, gfp_t mask);
153 int try_release_extent_mapping(struct extent_map_tree *map,
154 struct extent_io_tree *tree, struct page *page,
156 int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
157 int try_release_extent_state(struct extent_map_tree *map,
158 struct extent_io_tree *tree, struct page *page,
160 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
161 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
162 int bits, struct extent_state **cached, gfp_t mask);
163 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
164 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
166 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
167 get_extent_t *get_extent);
168 int __init extent_io_init(void);
169 void extent_io_exit(void);
171 u64 count_range_bits(struct extent_io_tree *tree,
172 u64 *start, u64 search_end,
173 u64 max_bytes, unsigned long bits);
175 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
176 int bits, int filled, struct extent_state *cached_state);
177 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
178 int bits, gfp_t mask);
179 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
180 int bits, int wake, int delete, struct extent_state **cached,
182 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
183 int bits, gfp_t mask);
184 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
186 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
188 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
190 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
192 int clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
194 int clear_extent_ordered_metadata(struct extent_io_tree *tree, u64 start,
195 u64 end, gfp_t mask);
196 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
198 int set_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
200 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
201 u64 *start_ret, u64 *end_ret, int bits);
202 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
203 u64 start, int bits);
204 int extent_invalidatepage(struct extent_io_tree *tree,
205 struct page *page, unsigned long offset);
206 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
207 get_extent_t *get_extent,
208 struct writeback_control *wbc);
209 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
210 u64 start, u64 end, get_extent_t *get_extent,
212 int extent_writepages(struct extent_io_tree *tree,
213 struct address_space *mapping,
214 get_extent_t *get_extent,
215 struct writeback_control *wbc);
216 int extent_readpages(struct extent_io_tree *tree,
217 struct address_space *mapping,
218 struct list_head *pages, unsigned nr_pages,
219 get_extent_t get_extent);
220 int extent_prepare_write(struct extent_io_tree *tree,
221 struct inode *inode, struct page *page,
222 unsigned from, unsigned to, get_extent_t *get_extent);
223 int extent_commit_write(struct extent_io_tree *tree,
224 struct inode *inode, struct page *page,
225 unsigned from, unsigned to);
226 sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
227 get_extent_t *get_extent);
228 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
229 __u64 start, __u64 len, get_extent_t *get_extent);
230 int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
231 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
232 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
233 void set_page_extent_mapped(struct page *page);
235 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
236 u64 start, unsigned long len,
239 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
240 u64 start, unsigned long len,
242 void free_extent_buffer(struct extent_buffer *eb);
243 int read_extent_buffer_pages(struct extent_io_tree *tree,
244 struct extent_buffer *eb, u64 start, int wait,
245 get_extent_t *get_extent, int mirror_num);
247 static inline void extent_buffer_get(struct extent_buffer *eb)
249 atomic_inc(&eb->refs);
252 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
255 void read_extent_buffer(struct extent_buffer *eb, void *dst,
258 void write_extent_buffer(struct extent_buffer *eb, const void *src,
259 unsigned long start, unsigned long len);
260 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
261 unsigned long dst_offset, unsigned long src_offset,
263 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
264 unsigned long src_offset, unsigned long len);
265 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
266 unsigned long src_offset, unsigned long len);
267 void memset_extent_buffer(struct extent_buffer *eb, char c,
268 unsigned long start, unsigned long len);
269 int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
270 struct extent_buffer *eb);
271 int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end);
272 int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
273 int clear_extent_buffer_dirty(struct extent_io_tree *tree,
274 struct extent_buffer *eb);
275 int set_extent_buffer_dirty(struct extent_io_tree *tree,
276 struct extent_buffer *eb);
277 int test_extent_buffer_dirty(struct extent_io_tree *tree,
278 struct extent_buffer *eb);
279 int set_extent_buffer_uptodate(struct extent_io_tree *tree,
280 struct extent_buffer *eb);
281 int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
282 struct extent_buffer *eb);
283 int extent_buffer_uptodate(struct extent_io_tree *tree,
284 struct extent_buffer *eb);
285 int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
286 unsigned long min_len, char **token, char **map,
287 unsigned long *map_start,
288 unsigned long *map_len, int km);
289 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
290 unsigned long min_len, char **token, char **map,
291 unsigned long *map_start,
292 unsigned long *map_len, int km);
293 void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
294 int release_extent_buffer_tail_pages(struct extent_buffer *eb);
295 int extent_range_uptodate(struct extent_io_tree *tree,
297 int extent_clear_unlock_delalloc(struct inode *inode,
298 struct extent_io_tree *tree,
299 u64 start, u64 end, struct page *locked_page,