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