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_NODATASUM (1 << 12)
20 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
22 /* flags for bio submission */
23 #define EXTENT_BIO_COMPRESSED 1
25 /* these are bit numbers for test/set bit */
26 #define EXTENT_BUFFER_UPTODATE 0
27 #define EXTENT_BUFFER_BLOCKING 1
28 #define EXTENT_BUFFER_DIRTY 2
31 * page->private values. Every page that is controlled by the extent
32 * map has page->private set to one.
34 #define EXTENT_PAGE_PRIVATE 1
35 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
39 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
40 struct bio *bio, int mirror_num,
41 unsigned long bio_flags);
42 struct extent_io_ops {
43 int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
44 u64 start, u64 end, int *page_started,
45 unsigned long *nr_written);
46 int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
47 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
48 extent_submit_bio_hook_t *submit_bio_hook;
49 int (*merge_bio_hook)(struct page *page, unsigned long offset,
50 size_t size, struct bio *bio,
51 unsigned long bio_flags);
52 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
53 int (*readpage_io_failed_hook)(struct bio *bio, struct page *page,
55 struct extent_state *state);
56 int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
58 struct extent_state *state);
59 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
60 struct extent_state *state);
61 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
62 struct extent_state *state, int uptodate);
63 int (*set_bit_hook)(struct inode *inode, u64 start, u64 end,
64 unsigned long old, unsigned long bits);
65 int (*clear_bit_hook)(struct inode *inode, u64 start, u64 end,
66 unsigned long old, unsigned long bits);
67 int (*write_cache_pages_lock_hook)(struct page *page);
70 struct extent_io_tree {
72 struct rb_root buffer;
73 struct address_space *mapping;
76 spinlock_t buffer_lock;
77 struct extent_io_ops *ops;
82 u64 end; /* inclusive */
83 struct rb_node rb_node;
84 struct extent_io_tree *tree;
89 /* for use by the FS */
92 struct list_head leak_list;
95 struct extent_buffer {
100 unsigned long map_start;
101 unsigned long map_len;
102 struct page *first_page;
103 unsigned long bflags;
105 struct list_head leak_list;
106 struct rb_node rb_node;
108 /* the spinlock is used to protect most operations */
112 * when we keep the lock held while blocking, waiters go onto
115 wait_queue_head_t lock_wq;
118 struct extent_map_tree;
120 static inline struct extent_state *extent_state_next(struct extent_state *state)
122 struct rb_node *node;
123 node = rb_next(&state->rb_node);
126 return rb_entry(node, struct extent_state, rb_node);
129 typedef struct extent_map *(get_extent_t)(struct inode *inode,
135 void extent_io_tree_init(struct extent_io_tree *tree,
136 struct address_space *mapping, gfp_t mask);
137 int try_release_extent_mapping(struct extent_map_tree *map,
138 struct extent_io_tree *tree, struct page *page,
140 int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
141 int try_release_extent_state(struct extent_map_tree *map,
142 struct extent_io_tree *tree, struct page *page,
144 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
145 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
146 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
148 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
149 get_extent_t *get_extent);
150 int __init extent_io_init(void);
151 void extent_io_exit(void);
153 u64 count_range_bits(struct extent_io_tree *tree,
154 u64 *start, u64 search_end,
155 u64 max_bytes, unsigned long bits);
157 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
158 int bits, int filled);
159 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
160 int bits, gfp_t mask);
161 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
162 int bits, int wake, int delete, gfp_t mask);
163 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
164 int bits, gfp_t mask);
165 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
167 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
169 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
171 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
173 int clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
175 int clear_extent_ordered_metadata(struct extent_io_tree *tree, u64 start,
176 u64 end, gfp_t mask);
177 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
179 int set_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
181 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
182 u64 *start_ret, u64 *end_ret, int bits);
183 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
184 u64 start, int bits);
185 int extent_invalidatepage(struct extent_io_tree *tree,
186 struct page *page, unsigned long offset);
187 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
188 get_extent_t *get_extent,
189 struct writeback_control *wbc);
190 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
191 u64 start, u64 end, get_extent_t *get_extent,
193 int extent_writepages(struct extent_io_tree *tree,
194 struct address_space *mapping,
195 get_extent_t *get_extent,
196 struct writeback_control *wbc);
197 int extent_readpages(struct extent_io_tree *tree,
198 struct address_space *mapping,
199 struct list_head *pages, unsigned nr_pages,
200 get_extent_t get_extent);
201 int extent_prepare_write(struct extent_io_tree *tree,
202 struct inode *inode, struct page *page,
203 unsigned from, unsigned to, get_extent_t *get_extent);
204 int extent_commit_write(struct extent_io_tree *tree,
205 struct inode *inode, struct page *page,
206 unsigned from, unsigned to);
207 sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
208 get_extent_t *get_extent);
209 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
210 __u64 start, __u64 len, get_extent_t *get_extent);
211 int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
212 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
213 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
214 void set_page_extent_mapped(struct page *page);
216 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
217 u64 start, unsigned long len,
220 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
221 u64 start, unsigned long len,
223 void free_extent_buffer(struct extent_buffer *eb);
224 int read_extent_buffer_pages(struct extent_io_tree *tree,
225 struct extent_buffer *eb, u64 start, int wait,
226 get_extent_t *get_extent, int mirror_num);
228 static inline void extent_buffer_get(struct extent_buffer *eb)
230 atomic_inc(&eb->refs);
233 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
236 void read_extent_buffer(struct extent_buffer *eb, void *dst,
239 void write_extent_buffer(struct extent_buffer *eb, const void *src,
240 unsigned long start, unsigned long len);
241 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
242 unsigned long dst_offset, unsigned long src_offset,
244 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
245 unsigned long src_offset, unsigned long len);
246 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
247 unsigned long src_offset, unsigned long len);
248 void memset_extent_buffer(struct extent_buffer *eb, char c,
249 unsigned long start, unsigned long len);
250 int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
251 struct extent_buffer *eb);
252 int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end);
253 int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
254 int clear_extent_buffer_dirty(struct extent_io_tree *tree,
255 struct extent_buffer *eb);
256 int set_extent_buffer_dirty(struct extent_io_tree *tree,
257 struct extent_buffer *eb);
258 int test_extent_buffer_dirty(struct extent_io_tree *tree,
259 struct extent_buffer *eb);
260 int set_extent_buffer_uptodate(struct extent_io_tree *tree,
261 struct extent_buffer *eb);
262 int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
263 struct extent_buffer *eb);
264 int extent_buffer_uptodate(struct extent_io_tree *tree,
265 struct extent_buffer *eb);
266 int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
267 unsigned long min_len, char **token, char **map,
268 unsigned long *map_start,
269 unsigned long *map_len, int km);
270 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
271 unsigned long min_len, char **token, char **map,
272 unsigned long *map_start,
273 unsigned long *map_len, int km);
274 void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
275 int release_extent_buffer_tail_pages(struct extent_buffer *eb);
276 int extent_range_uptodate(struct extent_io_tree *tree,
278 int extent_clear_unlock_delalloc(struct inode *inode,
279 struct extent_io_tree *tree,
280 u64 start, u64 end, struct page *locked_page,
283 int clear_delalloc, int clear_dirty,