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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 | #define EXTENT_BUFFER_DIRTY 2 |
29 | |
30 | /* |
31 | * page->private values. Every page that is controlled by the extent |
32 | * map has page->private set to one. |
33 | */ |
34 | #define EXTENT_PAGE_PRIVATE 1 |
35 | #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3 |
36 | |
37 | struct extent_state; |
38 | |
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, |
54 | u64 start, u64 end, |
55 | struct extent_state *state); |
56 | int (*writepage_io_failed_hook)(struct bio *bio, struct page *page, |
57 | u64 start, u64 end, |
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); |
68 | }; |
69 | |
70 | struct extent_io_tree { |
71 | struct rb_root state; |
72 | struct rb_root buffer; |
73 | struct address_space *mapping; |
74 | u64 dirty_bytes; |
75 | spinlock_t lock; |
76 | spinlock_t buffer_lock; |
77 | struct extent_io_ops *ops; |
78 | }; |
79 | |
80 | struct extent_state { |
81 | u64 start; |
82 | u64 end; /* inclusive */ |
83 | struct rb_node rb_node; |
84 | struct extent_io_tree *tree; |
85 | wait_queue_head_t wq; |
86 | atomic_t refs; |
87 | unsigned long state; |
88 | |
89 | /* for use by the FS */ |
90 | u64 private; |
91 | |
92 | struct list_head leak_list; |
93 | }; |
94 | |
95 | struct extent_buffer { |
96 | u64 start; |
97 | unsigned long len; |
98 | char *map_token; |
99 | char *kaddr; |
100 | unsigned long map_start; |
101 | unsigned long map_len; |
102 | struct page *first_page; |
103 | unsigned long bflags; |
104 | atomic_t refs; |
105 | struct list_head leak_list; |
106 | struct rb_node rb_node; |
107 | |
108 | /* the spinlock is used to protect most operations */ |
109 | spinlock_t lock; |
110 | |
111 | /* |
112 | * when we keep the lock held while blocking, waiters go onto |
113 | * the wq |
114 | */ |
115 | wait_queue_head_t lock_wq; |
116 | }; |
117 | |
118 | struct extent_map_tree; |
119 | |
120 | static inline struct extent_state *extent_state_next(struct extent_state *state) |
121 | { |
122 | struct rb_node *node; |
123 | node = rb_next(&state->rb_node); |
124 | if (!node) |
125 | return NULL; |
126 | return rb_entry(node, struct extent_state, rb_node); |
127 | } |
128 | |
129 | typedef struct extent_map *(get_extent_t)(struct inode *inode, |
130 | struct page *page, |
131 | size_t page_offset, |
132 | u64 start, u64 len, |
133 | int create); |
134 | |
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, |
139 | gfp_t mask); |
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, |
143 | gfp_t mask); |
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, |
147 | gfp_t mask); |
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); |
152 | |
153 | u64 count_range_bits(struct extent_io_tree *tree, |
154 | u64 *start, u64 search_end, |
155 | u64 max_bytes, unsigned long bits); |
156 | |
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, |
166 | gfp_t mask); |
167 | int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end, |
168 | gfp_t mask); |
169 | int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, |
170 | gfp_t mask); |
171 | int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, |
172 | gfp_t mask); |
173 | int clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end, |
174 | gfp_t mask); |
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, |
178 | gfp_t mask); |
179 | int set_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end, |
180 | gfp_t mask); |
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, |
192 | int mode); |
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); |
215 | |
216 | struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree, |
217 | u64 start, unsigned long len, |
218 | struct page *page0, |
219 | gfp_t mask); |
220 | struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree, |
221 | u64 start, unsigned long len, |
222 | gfp_t mask); |
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); |
227 | |
228 | static inline void extent_buffer_get(struct extent_buffer *eb) |
229 | { |
230 | atomic_inc(&eb->refs); |
231 | } |
232 | |
233 | int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, |
234 | unsigned long start, |
235 | unsigned long len); |
236 | void read_extent_buffer(struct extent_buffer *eb, void *dst, |
237 | unsigned long start, |
238 | unsigned long len); |
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, |
243 | unsigned long len); |
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, |
277 | u64 start, u64 end); |
278 | int extent_clear_unlock_delalloc(struct inode *inode, |
279 | struct extent_io_tree *tree, |
280 | u64 start, u64 end, struct page *locked_page, |
281 | int unlock_page, |
282 | int clear_unlock, |
283 | int clear_delalloc, int clear_dirty, |
284 | int set_writeback, |
285 | int end_writeback); |
286 | #endif |
287 |
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