Line data Source code
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_NORESERVE (1 << 15)
23 : #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
24 : #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
25 :
26 : /*
27 : * flags for bio submission. The high bits indicate the compression
28 : * type for this bio
29 : */
30 : #define EXTENT_BIO_COMPRESSED 1
31 : #define EXTENT_BIO_TREE_LOG 2
32 : #define EXTENT_BIO_PARENT_LOCKED 4
33 : #define EXTENT_BIO_FLAG_SHIFT 16
34 :
35 : /* these are bit numbers for test/set bit */
36 : #define EXTENT_BUFFER_UPTODATE 0
37 : #define EXTENT_BUFFER_BLOCKING 1
38 : #define EXTENT_BUFFER_DIRTY 2
39 : #define EXTENT_BUFFER_CORRUPT 3
40 : #define EXTENT_BUFFER_READAHEAD 4 /* this got triggered by readahead */
41 : #define EXTENT_BUFFER_TREE_REF 5
42 : #define EXTENT_BUFFER_STALE 6
43 : #define EXTENT_BUFFER_WRITEBACK 7
44 : #define EXTENT_BUFFER_IOERR 8
45 : #define EXTENT_BUFFER_DUMMY 9
46 : #define EXTENT_BUFFER_IN_TREE 10
47 :
48 : /* these are flags for extent_clear_unlock_delalloc */
49 : #define PAGE_UNLOCK (1 << 0)
50 : #define PAGE_CLEAR_DIRTY (1 << 1)
51 : #define PAGE_SET_WRITEBACK (1 << 2)
52 : #define PAGE_END_WRITEBACK (1 << 3)
53 : #define PAGE_SET_PRIVATE2 (1 << 4)
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 : struct btrfs_io_bio;
65 :
66 : typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
67 : struct bio *bio, int mirror_num,
68 : unsigned long bio_flags, u64 bio_offset);
69 : struct extent_io_ops {
70 : int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
71 : u64 start, u64 end, int *page_started,
72 : unsigned long *nr_written);
73 : int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
74 : int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
75 : extent_submit_bio_hook_t *submit_bio_hook;
76 : int (*merge_bio_hook)(int rw, struct page *page, unsigned long offset,
77 : size_t size, struct bio *bio,
78 : unsigned long bio_flags);
79 : int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
80 : int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset,
81 : struct page *page, u64 start, u64 end,
82 : 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 : unsigned long *bits);
87 : void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
88 : unsigned long *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 : };
95 :
96 : struct extent_io_tree {
97 : struct rb_root state;
98 : struct address_space *mapping;
99 : u64 dirty_bytes;
100 : int track_uptodate;
101 : spinlock_t 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 btrfs_fs_info *fs_info;
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 : struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
162 : #ifdef CONFIG_BTRFS_DEBUG
163 : struct list_head leak_list;
164 : #endif
165 : };
166 :
167 : static inline void extent_set_compress_type(unsigned long *bio_flags,
168 : int compress_type)
169 : {
170 332 : *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
171 : }
172 :
173 : static inline int extent_compress_type(unsigned long bio_flags)
174 : {
175 42 : return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
176 : }
177 :
178 : struct extent_map_tree;
179 :
180 : typedef struct extent_map *(get_extent_t)(struct inode *inode,
181 : struct page *page,
182 : size_t pg_offset,
183 : u64 start, u64 len,
184 : int create);
185 :
186 : void extent_io_tree_init(struct extent_io_tree *tree,
187 : struct address_space *mapping);
188 : int try_release_extent_mapping(struct extent_map_tree *map,
189 : struct extent_io_tree *tree, struct page *page,
190 : gfp_t mask);
191 : int try_release_extent_buffer(struct page *page);
192 : int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
193 : int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
194 : unsigned long bits, struct extent_state **cached);
195 : int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
196 : int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
197 : struct extent_state **cached, gfp_t mask);
198 : int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
199 : int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
200 : get_extent_t *get_extent, int mirror_num);
201 : int extent_read_full_page_nolock(struct extent_io_tree *tree, struct page *page,
202 : get_extent_t *get_extent, int mirror_num);
203 : int __init extent_io_init(void);
204 : void extent_io_exit(void);
205 :
206 : u64 count_range_bits(struct extent_io_tree *tree,
207 : u64 *start, u64 search_end,
208 : u64 max_bytes, unsigned long bits, int contig);
209 :
210 : void free_extent_state(struct extent_state *state);
211 : int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
212 : unsigned long bits, int filled,
213 : struct extent_state *cached_state);
214 : int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
215 : unsigned long bits, gfp_t mask);
216 : int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
217 : unsigned long bits, int wake, int delete,
218 : struct extent_state **cached, gfp_t mask);
219 : int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
220 : unsigned long bits, gfp_t mask);
221 : int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
222 : unsigned long bits, u64 *failed_start,
223 : struct extent_state **cached_state, gfp_t mask);
224 : int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
225 : struct extent_state **cached_state, gfp_t mask);
226 : int clear_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 : unsigned long bits, unsigned long clear_bits,
236 : struct extent_state **cached_state, gfp_t mask);
237 : int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
238 : struct extent_state **cached_state, gfp_t mask);
239 : int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end,
240 : struct extent_state **cached_state, gfp_t mask);
241 : int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
242 : u64 *start_ret, u64 *end_ret, unsigned long bits,
243 : struct extent_state **cached_state);
244 : int extent_invalidatepage(struct extent_io_tree *tree,
245 : struct page *page, unsigned long offset);
246 : int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
247 : get_extent_t *get_extent,
248 : struct writeback_control *wbc);
249 : int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
250 : u64 start, u64 end, get_extent_t *get_extent,
251 : int mode);
252 : int extent_writepages(struct extent_io_tree *tree,
253 : struct address_space *mapping,
254 : get_extent_t *get_extent,
255 : struct writeback_control *wbc);
256 : int btree_write_cache_pages(struct address_space *mapping,
257 : struct writeback_control *wbc);
258 : int extent_readpages(struct extent_io_tree *tree,
259 : struct address_space *mapping,
260 : struct list_head *pages, unsigned nr_pages,
261 : get_extent_t get_extent);
262 : int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
263 : __u64 start, __u64 len, get_extent_t *get_extent);
264 : int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
265 : void set_page_extent_mapped(struct page *page);
266 :
267 : struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
268 : u64 start, unsigned long len);
269 : struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len);
270 : struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
271 : struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
272 : u64 start);
273 : void free_extent_buffer(struct extent_buffer *eb);
274 : void free_extent_buffer_stale(struct extent_buffer *eb);
275 : #define WAIT_NONE 0
276 : #define WAIT_COMPLETE 1
277 : #define WAIT_PAGE_LOCK 2
278 : int read_extent_buffer_pages(struct extent_io_tree *tree,
279 : struct extent_buffer *eb, u64 start, int wait,
280 : get_extent_t *get_extent, int mirror_num);
281 : void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
282 :
283 : static inline unsigned long num_extent_pages(u64 start, u64 len)
284 : {
285 12217727 : return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
286 6108863 : (start >> PAGE_CACHE_SHIFT);
287 : }
288 :
289 : static inline struct page *extent_buffer_page(struct extent_buffer *eb,
290 : unsigned long i)
291 : {
292 74491579 : return eb->pages[i];
293 : }
294 :
295 : static inline void extent_buffer_get(struct extent_buffer *eb)
296 : {
297 1649613 : atomic_inc(&eb->refs);
298 : }
299 :
300 : int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
301 : unsigned long start,
302 : unsigned long len);
303 : void read_extent_buffer(struct extent_buffer *eb, void *dst,
304 : unsigned long start,
305 : unsigned long len);
306 : int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dst,
307 : unsigned long start,
308 : unsigned long len);
309 : void write_extent_buffer(struct extent_buffer *eb, const void *src,
310 : unsigned long start, unsigned long len);
311 : void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
312 : unsigned long dst_offset, unsigned long src_offset,
313 : unsigned long len);
314 : void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
315 : unsigned long src_offset, unsigned long len);
316 : void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
317 : unsigned long src_offset, unsigned long len);
318 : void memset_extent_buffer(struct extent_buffer *eb, char c,
319 : unsigned long start, unsigned long len);
320 : void clear_extent_buffer_dirty(struct extent_buffer *eb);
321 : int set_extent_buffer_dirty(struct extent_buffer *eb);
322 : int set_extent_buffer_uptodate(struct extent_buffer *eb);
323 : int clear_extent_buffer_uptodate(struct extent_buffer *eb);
324 : int extent_buffer_uptodate(struct extent_buffer *eb);
325 : int extent_buffer_under_io(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, u64 start, u64 end,
333 : struct page *locked_page,
334 : unsigned long bits_to_clear,
335 : unsigned long page_ops);
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 : #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
351 : noinline u64 find_lock_delalloc_range(struct inode *inode,
352 : struct extent_io_tree *tree,
353 : struct page *locked_page, u64 *start,
354 : u64 *end, u64 max_bytes);
355 : struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
356 : u64 start, unsigned long len);
357 : #endif
358 : #endif
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