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_NEED_WAIT (1 << 13)
21 #define EXTENT_DAMAGED (1 << 14)
22 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
23 #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
24
25 /*
26 * flags for bio submission. The high bits indicate the compression
27 * type for this bio
28 */
29 #define EXTENT_BIO_COMPRESSED 1
30 #define EXTENT_BIO_TREE_LOG 2
31 #define EXTENT_BIO_FLAG_SHIFT 16
32
33 /* these are bit numbers for test/set bit */
34 #define EXTENT_BUFFER_UPTODATE 0
35 #define EXTENT_BUFFER_BLOCKING 1
36 #define EXTENT_BUFFER_DIRTY 2
37 #define EXTENT_BUFFER_CORRUPT 3
38 #define EXTENT_BUFFER_READAHEAD 4 /* this got triggered by readahead */
39 #define EXTENT_BUFFER_TREE_REF 5
40 #define EXTENT_BUFFER_STALE 6
41 #define EXTENT_BUFFER_WRITEBACK 7
42 #define EXTENT_BUFFER_IOERR 8
43 #define EXTENT_BUFFER_DUMMY 9
44
45 /* these are flags for extent_clear_unlock_delalloc */
46 #define EXTENT_CLEAR_UNLOCK_PAGE 0x1
47 #define EXTENT_CLEAR_UNLOCK 0x2
48 #define EXTENT_CLEAR_DELALLOC 0x4
49 #define EXTENT_CLEAR_DIRTY 0x8
50 #define EXTENT_SET_WRITEBACK 0x10
51 #define EXTENT_END_WRITEBACK 0x20
52 #define EXTENT_SET_PRIVATE2 0x40
53 #define EXTENT_CLEAR_ACCOUNTING 0x80
54
55 /*
56 * page->private values. Every page that is controlled by the extent
57 * map has page->private set to one.
58 */
59 #define EXTENT_PAGE_PRIVATE 1
60 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
61
62 struct extent_state;
63 struct btrfs_root;
64
65 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
66 struct bio *bio, int mirror_num,
67 unsigned long bio_flags, u64 bio_offset);
68 struct extent_io_ops {
69 int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
70 u64 start, u64 end, int *page_started,
71 unsigned long *nr_written);
72 int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
73 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
74 extent_submit_bio_hook_t *submit_bio_hook;
75 int (*merge_bio_hook)(int rw, struct page *page, unsigned long offset,
76 size_t size, struct bio *bio,
77 unsigned long bio_flags);
78 int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
79 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
80 struct extent_state *state, int mirror);
81 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
82 struct extent_state *state, int uptodate);
83 void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
84 unsigned long *bits);
85 void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
86 unsigned long *bits);
87 void (*merge_extent_hook)(struct inode *inode,
88 struct extent_state *new,
89 struct extent_state *other);
90 void (*split_extent_hook)(struct inode *inode,
91 struct extent_state *orig, u64 split);
92 };
93
94 struct extent_io_tree {
95 struct rb_root state;
96 struct radix_tree_root buffer;
97 struct address_space *mapping;
98 u64 dirty_bytes;
99 int track_uptodate;
100 spinlock_t lock;
101 spinlock_t buffer_lock;
102 struct extent_io_ops *ops;
103 };
104
105 struct extent_state {
106 u64 start;
107 u64 end; /* inclusive */
108 struct rb_node rb_node;
109
110 /* ADD NEW ELEMENTS AFTER THIS */
111 struct extent_io_tree *tree;
112 wait_queue_head_t wq;
113 atomic_t refs;
114 unsigned long state;
115
116 /* for use by the FS */
117 u64 private;
118
119 #ifdef CONFIG_BTRFS_DEBUG
120 struct list_head leak_list;
121 #endif
122 };
123
124 #define INLINE_EXTENT_BUFFER_PAGES 16
125 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
126 struct extent_buffer {
127 u64 start;
128 unsigned long len;
129 unsigned long map_start;
130 unsigned long map_len;
131 unsigned long bflags;
132 struct extent_io_tree *tree;
133 spinlock_t refs_lock;
134 atomic_t refs;
135 atomic_t io_pages;
136 int read_mirror;
137 struct rcu_head rcu_head;
138 pid_t lock_owner;
139
140 /* count of read lock holders on the extent buffer */
141 atomic_t write_locks;
142 atomic_t read_locks;
143 atomic_t blocking_writers;
144 atomic_t blocking_readers;
145 atomic_t spinning_readers;
146 atomic_t spinning_writers;
147 int lock_nested;
148
149 /* protects write locks */
150 rwlock_t lock;
151
152 /* readers use lock_wq while they wait for the write
153 * lock holders to unlock
154 */
155 wait_queue_head_t write_lock_wq;
156
157 /* writers use read_lock_wq while they wait for readers
158 * to unlock
159 */
160 wait_queue_head_t read_lock_wq;
161 wait_queue_head_t lock_wq;
162 struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
163 #ifdef CONFIG_BTRFS_DEBUG
164 struct list_head leak_list;
165 #endif
166 };
167
extent_set_compress_type(unsigned long * bio_flags,int compress_type)168 static inline void extent_set_compress_type(unsigned long *bio_flags,
169 int compress_type)
170 {
171 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
172 }
173
extent_compress_type(unsigned long bio_flags)174 static inline int extent_compress_type(unsigned long bio_flags)
175 {
176 return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
177 }
178
179 struct extent_map_tree;
180
181 typedef struct extent_map *(get_extent_t)(struct inode *inode,
182 struct page *page,
183 size_t pg_offset,
184 u64 start, u64 len,
185 int create);
186
187 void extent_io_tree_init(struct extent_io_tree *tree,
188 struct address_space *mapping);
189 int try_release_extent_mapping(struct extent_map_tree *map,
190 struct extent_io_tree *tree, struct page *page,
191 gfp_t mask);
192 int try_release_extent_buffer(struct page *page);
193 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
194 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
195 unsigned long bits, struct extent_state **cached);
196 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
197 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
198 struct extent_state **cached, gfp_t mask);
199 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
200 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
201 get_extent_t *get_extent, int mirror_num);
202 int __init extent_io_init(void);
203 void extent_io_exit(void);
204
205 u64 count_range_bits(struct extent_io_tree *tree,
206 u64 *start, u64 search_end,
207 u64 max_bytes, unsigned long bits, int contig);
208
209 void free_extent_state(struct extent_state *state);
210 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
211 unsigned long bits, int filled,
212 struct extent_state *cached_state);
213 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
214 unsigned long bits, gfp_t mask);
215 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
216 unsigned long bits, int wake, int delete,
217 struct extent_state **cached, gfp_t mask);
218 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
219 unsigned long bits, gfp_t mask);
220 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
221 unsigned long bits, u64 *failed_start,
222 struct extent_state **cached_state, gfp_t mask);
223 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
224 struct extent_state **cached_state, gfp_t mask);
225 int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
226 struct extent_state **cached_state, gfp_t mask);
227 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
228 gfp_t mask);
229 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
230 gfp_t mask);
231 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
232 gfp_t mask);
233 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
234 unsigned long bits, unsigned long clear_bits,
235 struct extent_state **cached_state, gfp_t mask);
236 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
237 struct extent_state **cached_state, gfp_t mask);
238 int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end,
239 struct extent_state **cached_state, gfp_t mask);
240 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
241 u64 *start_ret, u64 *end_ret, unsigned long bits,
242 struct extent_state **cached_state);
243 int extent_invalidatepage(struct extent_io_tree *tree,
244 struct page *page, unsigned long offset);
245 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
246 get_extent_t *get_extent,
247 struct writeback_control *wbc);
248 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
249 u64 start, u64 end, get_extent_t *get_extent,
250 int mode);
251 int extent_writepages(struct extent_io_tree *tree,
252 struct address_space *mapping,
253 get_extent_t *get_extent,
254 struct writeback_control *wbc);
255 int btree_write_cache_pages(struct address_space *mapping,
256 struct writeback_control *wbc);
257 int extent_readpages(struct extent_io_tree *tree,
258 struct address_space *mapping,
259 struct list_head *pages, unsigned nr_pages,
260 get_extent_t get_extent);
261 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
262 __u64 start, __u64 len, get_extent_t *get_extent);
263 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
264 void extent_cache_csums_dio(struct extent_io_tree *tree, u64 start, u32 csums[],
265 int count);
266 void extent_cache_csums(struct extent_io_tree *tree, struct bio *bio,
267 int bvec_index, u32 csums[], int count);
268 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
269 void set_page_extent_mapped(struct page *page);
270
271 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
272 u64 start, unsigned long len);
273 struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len);
274 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
275 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
276 u64 start, unsigned long len);
277 void free_extent_buffer(struct extent_buffer *eb);
278 void free_extent_buffer_stale(struct extent_buffer *eb);
279 #define WAIT_NONE 0
280 #define WAIT_COMPLETE 1
281 #define WAIT_PAGE_LOCK 2
282 int read_extent_buffer_pages(struct extent_io_tree *tree,
283 struct extent_buffer *eb, u64 start, int wait,
284 get_extent_t *get_extent, int mirror_num);
285 void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
286
num_extent_pages(u64 start,u64 len)287 static inline unsigned long num_extent_pages(u64 start, u64 len)
288 {
289 return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
290 (start >> PAGE_CACHE_SHIFT);
291 }
292
extent_buffer_page(struct extent_buffer * eb,unsigned long i)293 static inline struct page *extent_buffer_page(struct extent_buffer *eb,
294 unsigned long i)
295 {
296 return eb->pages[i];
297 }
298
extent_buffer_get(struct extent_buffer * eb)299 static inline void extent_buffer_get(struct extent_buffer *eb)
300 {
301 atomic_inc(&eb->refs);
302 }
303
304 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
305 unsigned long start,
306 unsigned long len);
307 void read_extent_buffer(struct extent_buffer *eb, void *dst,
308 unsigned long start,
309 unsigned long len);
310 void write_extent_buffer(struct extent_buffer *eb, const void *src,
311 unsigned long start, unsigned long len);
312 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
313 unsigned long dst_offset, unsigned long src_offset,
314 unsigned long len);
315 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
316 unsigned long src_offset, unsigned long len);
317 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
318 unsigned long src_offset, unsigned long len);
319 void memset_extent_buffer(struct extent_buffer *eb, char c,
320 unsigned long start, unsigned long len);
321 void clear_extent_buffer_dirty(struct extent_buffer *eb);
322 int set_extent_buffer_dirty(struct extent_buffer *eb);
323 int set_extent_buffer_uptodate(struct extent_buffer *eb);
324 int clear_extent_buffer_uptodate(struct extent_buffer *eb);
325 int extent_buffer_uptodate(struct extent_buffer *eb);
326 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
327 unsigned long min_len, char **map,
328 unsigned long *map_start,
329 unsigned long *map_len);
330 int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
331 int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
332 int extent_clear_unlock_delalloc(struct inode *inode,
333 struct extent_io_tree *tree,
334 u64 start, u64 end, struct page *locked_page,
335 unsigned long op);
336 struct bio *
337 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
338 gfp_t gfp_flags);
339 struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
340 struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask);
341
342 struct btrfs_fs_info;
343
344 int repair_io_failure(struct btrfs_fs_info *fs_info, u64 start,
345 u64 length, u64 logical, struct page *page,
346 int mirror_num);
347 int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
348 int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
349 int mirror_num);
350 #endif
351