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_BOUNDARY (1 << 9)
17 #define EXTENT_NODATASUM (1 << 10)
18 #define EXTENT_DO_ACCOUNTING (1 << 11)
19 #define EXTENT_FIRST_DELALLOC (1 << 12)
20 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
21 #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
22
23 /*
24 * flags for bio submission. The high bits indicate the compression
25 * type for this bio
26 */
27 #define EXTENT_BIO_COMPRESSED 1
28 #define EXTENT_BIO_FLAG_SHIFT 16
29
30 /* these are bit numbers for test/set bit */
31 #define EXTENT_BUFFER_UPTODATE 0
32 #define EXTENT_BUFFER_BLOCKING 1
33 #define EXTENT_BUFFER_DIRTY 2
34 #define EXTENT_BUFFER_CORRUPT 3
35
36 /* these are flags for extent_clear_unlock_delalloc */
37 #define EXTENT_CLEAR_UNLOCK_PAGE 0x1
38 #define EXTENT_CLEAR_UNLOCK 0x2
39 #define EXTENT_CLEAR_DELALLOC 0x4
40 #define EXTENT_CLEAR_DIRTY 0x8
41 #define EXTENT_SET_WRITEBACK 0x10
42 #define EXTENT_END_WRITEBACK 0x20
43 #define EXTENT_SET_PRIVATE2 0x40
44 #define EXTENT_CLEAR_ACCOUNTING 0x80
45
46 /*
47 * page->private values. Every page that is controlled by the extent
48 * map has page->private set to one.
49 */
50 #define EXTENT_PAGE_PRIVATE 1
51 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
52
53 struct extent_state;
54
55 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
56 struct bio *bio, int mirror_num,
57 unsigned long bio_flags, u64 bio_offset);
58 struct extent_io_ops {
59 int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
60 u64 start, u64 end, int *page_started,
61 unsigned long *nr_written);
62 int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
63 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
64 extent_submit_bio_hook_t *submit_bio_hook;
65 int (*merge_bio_hook)(struct page *page, unsigned long offset,
66 size_t size, struct bio *bio,
67 unsigned long bio_flags);
68 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
69 int (*readpage_io_failed_hook)(struct bio *bio, struct page *page,
70 u64 start, u64 end,
71 struct extent_state *state);
72 int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
73 u64 start, u64 end,
74 struct extent_state *state);
75 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
76 struct extent_state *state);
77 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
78 struct extent_state *state, int uptodate);
79 int (*set_bit_hook)(struct inode *inode, struct extent_state *state,
80 int *bits);
81 int (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
82 int *bits);
83 int (*merge_extent_hook)(struct inode *inode,
84 struct extent_state *new,
85 struct extent_state *other);
86 int (*split_extent_hook)(struct inode *inode,
87 struct extent_state *orig, u64 split);
88 int (*write_cache_pages_lock_hook)(struct page *page);
89 };
90
91 struct extent_io_tree {
92 struct rb_root state;
93 struct radix_tree_root buffer;
94 struct address_space *mapping;
95 u64 dirty_bytes;
96 spinlock_t lock;
97 spinlock_t buffer_lock;
98 struct extent_io_ops *ops;
99 };
100
101 struct extent_state {
102 u64 start;
103 u64 end; /* inclusive */
104 struct rb_node rb_node;
105
106 /* ADD NEW ELEMENTS AFTER THIS */
107 struct extent_io_tree *tree;
108 wait_queue_head_t wq;
109 atomic_t refs;
110 unsigned long state;
111 u64 split_start;
112 u64 split_end;
113
114 /* for use by the FS */
115 u64 private;
116
117 struct list_head leak_list;
118 };
119
120 struct extent_buffer {
121 u64 start;
122 unsigned long len;
123 char *map_token;
124 char *kaddr;
125 unsigned long map_start;
126 unsigned long map_len;
127 struct page *first_page;
128 unsigned long bflags;
129 atomic_t refs;
130 struct list_head leak_list;
131 struct rcu_head rcu_head;
132
133 /* the spinlock is used to protect most operations */
134 spinlock_t lock;
135
136 /*
137 * when we keep the lock held while blocking, waiters go onto
138 * the wq
139 */
140 wait_queue_head_t lock_wq;
141 };
142
extent_set_compress_type(unsigned long * bio_flags,int compress_type)143 static inline void extent_set_compress_type(unsigned long *bio_flags,
144 int compress_type)
145 {
146 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
147 }
148
extent_compress_type(unsigned long bio_flags)149 static inline int extent_compress_type(unsigned long bio_flags)
150 {
151 return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
152 }
153
154 struct extent_map_tree;
155
extent_state_next(struct extent_state * state)156 static inline struct extent_state *extent_state_next(struct extent_state *state)
157 {
158 struct rb_node *node;
159 node = rb_next(&state->rb_node);
160 if (!node)
161 return NULL;
162 return rb_entry(node, struct extent_state, rb_node);
163 }
164
165 typedef struct extent_map *(get_extent_t)(struct inode *inode,
166 struct page *page,
167 size_t page_offset,
168 u64 start, u64 len,
169 int create);
170
171 void extent_io_tree_init(struct extent_io_tree *tree,
172 struct address_space *mapping, gfp_t mask);
173 int try_release_extent_mapping(struct extent_map_tree *map,
174 struct extent_io_tree *tree, struct page *page,
175 gfp_t mask);
176 int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
177 int try_release_extent_state(struct extent_map_tree *map,
178 struct extent_io_tree *tree, struct page *page,
179 gfp_t mask);
180 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
181 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
182 int bits, struct extent_state **cached, gfp_t mask);
183 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
184 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
185 struct extent_state **cached, gfp_t mask);
186 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
187 gfp_t mask);
188 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
189 get_extent_t *get_extent);
190 int __init extent_io_init(void);
191 void extent_io_exit(void);
192
193 u64 count_range_bits(struct extent_io_tree *tree,
194 u64 *start, u64 search_end,
195 u64 max_bytes, unsigned long bits, int contig);
196
197 void free_extent_state(struct extent_state *state);
198 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
199 int bits, int filled, struct extent_state *cached_state);
200 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
201 int bits, gfp_t mask);
202 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
203 int bits, int wake, int delete, struct extent_state **cached,
204 gfp_t mask);
205 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
206 int bits, gfp_t mask);
207 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
208 int bits, int exclusive_bits, u64 *failed_start,
209 struct extent_state **cached_state, gfp_t mask);
210 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
211 struct extent_state **cached_state, gfp_t mask);
212 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
213 gfp_t mask);
214 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
215 gfp_t mask);
216 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
217 gfp_t mask);
218 int clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
219 gfp_t mask);
220 int clear_extent_ordered_metadata(struct extent_io_tree *tree, u64 start,
221 u64 end, gfp_t mask);
222 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
223 struct extent_state **cached_state, gfp_t mask);
224 int set_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
225 gfp_t mask);
226 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
227 u64 *start_ret, u64 *end_ret, int bits);
228 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
229 u64 start, int bits);
230 int extent_invalidatepage(struct extent_io_tree *tree,
231 struct page *page, unsigned long offset);
232 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
233 get_extent_t *get_extent,
234 struct writeback_control *wbc);
235 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
236 u64 start, u64 end, get_extent_t *get_extent,
237 int mode);
238 int extent_writepages(struct extent_io_tree *tree,
239 struct address_space *mapping,
240 get_extent_t *get_extent,
241 struct writeback_control *wbc);
242 int extent_readpages(struct extent_io_tree *tree,
243 struct address_space *mapping,
244 struct list_head *pages, unsigned nr_pages,
245 get_extent_t get_extent);
246 int extent_prepare_write(struct extent_io_tree *tree,
247 struct inode *inode, struct page *page,
248 unsigned from, unsigned to, get_extent_t *get_extent);
249 int extent_commit_write(struct extent_io_tree *tree,
250 struct inode *inode, struct page *page,
251 unsigned from, unsigned to);
252 sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
253 get_extent_t *get_extent);
254 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
255 __u64 start, __u64 len, get_extent_t *get_extent);
256 int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
257 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
258 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
259 void set_page_extent_mapped(struct page *page);
260
261 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
262 u64 start, unsigned long len,
263 struct page *page0,
264 gfp_t mask);
265 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
266 u64 start, unsigned long len,
267 gfp_t mask);
268 void free_extent_buffer(struct extent_buffer *eb);
269 int read_extent_buffer_pages(struct extent_io_tree *tree,
270 struct extent_buffer *eb, u64 start, int wait,
271 get_extent_t *get_extent, int mirror_num);
272
extent_buffer_get(struct extent_buffer * eb)273 static inline void extent_buffer_get(struct extent_buffer *eb)
274 {
275 atomic_inc(&eb->refs);
276 }
277
278 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
279 unsigned long start,
280 unsigned long len);
281 void read_extent_buffer(struct extent_buffer *eb, void *dst,
282 unsigned long start,
283 unsigned long len);
284 void write_extent_buffer(struct extent_buffer *eb, const void *src,
285 unsigned long start, unsigned long len);
286 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
287 unsigned long dst_offset, unsigned long src_offset,
288 unsigned long len);
289 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
290 unsigned long src_offset, unsigned long len);
291 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
292 unsigned long src_offset, unsigned long len);
293 void memset_extent_buffer(struct extent_buffer *eb, char c,
294 unsigned long start, unsigned long len);
295 int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
296 struct extent_buffer *eb);
297 int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end);
298 int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
299 int clear_extent_buffer_dirty(struct extent_io_tree *tree,
300 struct extent_buffer *eb);
301 int set_extent_buffer_dirty(struct extent_io_tree *tree,
302 struct extent_buffer *eb);
303 int test_extent_buffer_dirty(struct extent_io_tree *tree,
304 struct extent_buffer *eb);
305 int set_extent_buffer_uptodate(struct extent_io_tree *tree,
306 struct extent_buffer *eb);
307 int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
308 struct extent_buffer *eb,
309 struct extent_state **cached_state);
310 int extent_buffer_uptodate(struct extent_io_tree *tree,
311 struct extent_buffer *eb,
312 struct extent_state *cached_state);
313 int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
314 unsigned long min_len, char **token, char **map,
315 unsigned long *map_start,
316 unsigned long *map_len, int km);
317 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
318 unsigned long min_len, char **token, char **map,
319 unsigned long *map_start,
320 unsigned long *map_len, int km);
321 void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
322 int release_extent_buffer_tail_pages(struct extent_buffer *eb);
323 int extent_range_uptodate(struct extent_io_tree *tree,
324 u64 start, u64 end);
325 int extent_clear_unlock_delalloc(struct inode *inode,
326 struct extent_io_tree *tree,
327 u64 start, u64 end, struct page *locked_page,
328 unsigned long op);
329 struct bio *
330 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
331 gfp_t gfp_flags);
332 #endif
333