1 #ifndef __EXTENTIO__
2 #define __EXTENTIO__
3
4 #include <linux/rbtree.h>
5
6 /* bits for the extent state */
7 #define EXTENT_DIRTY 1
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)
21
22 /* flags for bio submission */
23 #define EXTENT_BIO_COMPRESSED 1
24
25 /* these are bit numbers for test/set bit */
26 #define EXTENT_BUFFER_UPTODATE 0
27 #define EXTENT_BUFFER_BLOCKING 1
28
29 /*
30 * page->private values. Every page that is controlled by the extent
31 * map has page->private set to one.
32 */
33 #define EXTENT_PAGE_PRIVATE 1
34 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
35
36 struct extent_state;
37
38 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
39 struct bio *bio, int mirror_num,
40 unsigned long bio_flags);
41 struct extent_io_ops {
42 int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
43 u64 start, u64 end, int *page_started,
44 unsigned long *nr_written);
45 int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
46 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
47 extent_submit_bio_hook_t *submit_bio_hook;
48 int (*merge_bio_hook)(struct page *page, unsigned long offset,
49 size_t size, struct bio *bio,
50 unsigned long bio_flags);
51 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
52 int (*readpage_io_failed_hook)(struct bio *bio, struct page *page,
53 u64 start, u64 end,
54 struct extent_state *state);
55 int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
56 u64 start, u64 end,
57 struct extent_state *state);
58 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
59 struct extent_state *state);
60 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
61 struct extent_state *state, int uptodate);
62 int (*set_bit_hook)(struct inode *inode, u64 start, u64 end,
63 unsigned long old, unsigned long bits);
64 int (*clear_bit_hook)(struct inode *inode, u64 start, u64 end,
65 unsigned long old, unsigned long bits);
66 int (*write_cache_pages_lock_hook)(struct page *page);
67 };
68
69 struct extent_io_tree {
70 struct rb_root state;
71 struct rb_root buffer;
72 struct address_space *mapping;
73 u64 dirty_bytes;
74 spinlock_t lock;
75 spinlock_t buffer_lock;
76 struct extent_io_ops *ops;
77 };
78
79 struct extent_state {
80 u64 start;
81 u64 end; /* inclusive */
82 struct rb_node rb_node;
83 struct extent_io_tree *tree;
84 wait_queue_head_t wq;
85 atomic_t refs;
86 unsigned long state;
87
88 /* for use by the FS */
89 u64 private;
90
91 struct list_head leak_list;
92 };
93
94 struct extent_buffer {
95 u64 start;
96 unsigned long len;
97 char *map_token;
98 char *kaddr;
99 unsigned long map_start;
100 unsigned long map_len;
101 struct page *first_page;
102 unsigned long bflags;
103 atomic_t refs;
104 struct list_head leak_list;
105 struct rb_node rb_node;
106
107 /* the spinlock is used to protect most operations */
108 spinlock_t lock;
109
110 /*
111 * when we keep the lock held while blocking, waiters go onto
112 * the wq
113 */
114 wait_queue_head_t lock_wq;
115 };
116
117 struct extent_map_tree;
118
extent_state_next(struct extent_state * state)119 static inline struct extent_state *extent_state_next(struct extent_state *state)
120 {
121 struct rb_node *node;
122 node = rb_next(&state->rb_node);
123 if (!node)
124 return NULL;
125 return rb_entry(node, struct extent_state, rb_node);
126 }
127
128 typedef struct extent_map *(get_extent_t)(struct inode *inode,
129 struct page *page,
130 size_t page_offset,
131 u64 start, u64 len,
132 int create);
133
134 void extent_io_tree_init(struct extent_io_tree *tree,
135 struct address_space *mapping, gfp_t mask);
136 int try_release_extent_mapping(struct extent_map_tree *map,
137 struct extent_io_tree *tree, struct page *page,
138 gfp_t mask);
139 int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
140 int try_release_extent_state(struct extent_map_tree *map,
141 struct extent_io_tree *tree, struct page *page,
142 gfp_t mask);
143 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
144 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
145 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
146 gfp_t mask);
147 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
148 get_extent_t *get_extent);
149 int __init extent_io_init(void);
150 void extent_io_exit(void);
151
152 u64 count_range_bits(struct extent_io_tree *tree,
153 u64 *start, u64 search_end,
154 u64 max_bytes, unsigned long bits);
155
156 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
157 int bits, int filled);
158 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
159 int bits, gfp_t mask);
160 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
161 int bits, int wake, int delete, gfp_t mask);
162 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
163 int bits, gfp_t mask);
164 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
165 gfp_t mask);
166 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
167 gfp_t mask);
168 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
169 gfp_t mask);
170 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
171 gfp_t mask);
172 int clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
173 gfp_t mask);
174 int clear_extent_ordered_metadata(struct extent_io_tree *tree, u64 start,
175 u64 end, gfp_t mask);
176 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
177 gfp_t mask);
178 int set_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
179 gfp_t mask);
180 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
181 u64 *start_ret, u64 *end_ret, int bits);
182 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
183 u64 start, int bits);
184 int extent_invalidatepage(struct extent_io_tree *tree,
185 struct page *page, unsigned long offset);
186 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
187 get_extent_t *get_extent,
188 struct writeback_control *wbc);
189 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
190 u64 start, u64 end, get_extent_t *get_extent,
191 int mode);
192 int extent_writepages(struct extent_io_tree *tree,
193 struct address_space *mapping,
194 get_extent_t *get_extent,
195 struct writeback_control *wbc);
196 int extent_readpages(struct extent_io_tree *tree,
197 struct address_space *mapping,
198 struct list_head *pages, unsigned nr_pages,
199 get_extent_t get_extent);
200 int extent_prepare_write(struct extent_io_tree *tree,
201 struct inode *inode, struct page *page,
202 unsigned from, unsigned to, get_extent_t *get_extent);
203 int extent_commit_write(struct extent_io_tree *tree,
204 struct inode *inode, struct page *page,
205 unsigned from, unsigned to);
206 sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
207 get_extent_t *get_extent);
208 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
209 __u64 start, __u64 len, get_extent_t *get_extent);
210 int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
211 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
212 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
213 void set_page_extent_mapped(struct page *page);
214
215 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
216 u64 start, unsigned long len,
217 struct page *page0,
218 gfp_t mask);
219 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
220 u64 start, unsigned long len,
221 gfp_t mask);
222 void free_extent_buffer(struct extent_buffer *eb);
223 int read_extent_buffer_pages(struct extent_io_tree *tree,
224 struct extent_buffer *eb, u64 start, int wait,
225 get_extent_t *get_extent, int mirror_num);
226
extent_buffer_get(struct extent_buffer * eb)227 static inline void extent_buffer_get(struct extent_buffer *eb)
228 {
229 atomic_inc(&eb->refs);
230 }
231
232 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
233 unsigned long start,
234 unsigned long len);
235 void read_extent_buffer(struct extent_buffer *eb, void *dst,
236 unsigned long start,
237 unsigned long len);
238 void write_extent_buffer(struct extent_buffer *eb, const void *src,
239 unsigned long start, unsigned long len);
240 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
241 unsigned long dst_offset, unsigned long src_offset,
242 unsigned long len);
243 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
244 unsigned long src_offset, unsigned long len);
245 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
246 unsigned long src_offset, unsigned long len);
247 void memset_extent_buffer(struct extent_buffer *eb, char c,
248 unsigned long start, unsigned long len);
249 int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
250 struct extent_buffer *eb);
251 int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end);
252 int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
253 int clear_extent_buffer_dirty(struct extent_io_tree *tree,
254 struct extent_buffer *eb);
255 int set_extent_buffer_dirty(struct extent_io_tree *tree,
256 struct extent_buffer *eb);
257 int set_extent_buffer_uptodate(struct extent_io_tree *tree,
258 struct extent_buffer *eb);
259 int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
260 struct extent_buffer *eb);
261 int extent_buffer_uptodate(struct extent_io_tree *tree,
262 struct extent_buffer *eb);
263 int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
264 unsigned long min_len, char **token, char **map,
265 unsigned long *map_start,
266 unsigned long *map_len, int km);
267 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
268 unsigned long min_len, char **token, char **map,
269 unsigned long *map_start,
270 unsigned long *map_len, int km);
271 void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
272 int release_extent_buffer_tail_pages(struct extent_buffer *eb);
273 int extent_range_uptodate(struct extent_io_tree *tree,
274 u64 start, u64 end);
275 int extent_clear_unlock_delalloc(struct inode *inode,
276 struct extent_io_tree *tree,
277 u64 start, u64 end, struct page *locked_page,
278 int unlock_page,
279 int clear_unlock,
280 int clear_delalloc, int clear_dirty,
281 int set_writeback,
282 int end_writeback);
283 #endif
284