Branch data 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 : :
47 : : /* these are flags for extent_clear_unlock_delalloc */
48 : : #define PAGE_UNLOCK (1 << 0)
49 : : #define PAGE_CLEAR_DIRTY (1 << 1)
50 : : #define PAGE_SET_WRITEBACK (1 << 2)
51 : : #define PAGE_END_WRITEBACK (1 << 3)
52 : : #define PAGE_SET_PRIVATE2 (1 << 4)
53 : :
54 : : /*
55 : : * page->private values. Every page that is controlled by the extent
56 : : * map has page->private set to one.
57 : : */
58 : : #define EXTENT_PAGE_PRIVATE 1
59 : : #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
60 : :
61 : : struct extent_state;
62 : : struct btrfs_root;
63 : : struct btrfs_io_bio;
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 btrfs_io_bio *io_bio, u64 phy_offset,
80 : : struct page *page, u64 start, u64 end,
81 : : int mirror);
82 : : int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
83 : : struct extent_state *state, int uptodate);
84 : : void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
85 : : unsigned long *bits);
86 : : void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
87 : : unsigned long *bits);
88 : : void (*merge_extent_hook)(struct inode *inode,
89 : : struct extent_state *new,
90 : : struct extent_state *other);
91 : : void (*split_extent_hook)(struct inode *inode,
92 : : struct extent_state *orig, u64 split);
93 : : };
94 : :
95 : : struct extent_io_tree {
96 : : struct rb_root state;
97 : : struct radix_tree_root buffer;
98 : : struct address_space *mapping;
99 : : u64 dirty_bytes;
100 : : int track_uptodate;
101 : : spinlock_t lock;
102 : : spinlock_t buffer_lock;
103 : : struct extent_io_ops *ops;
104 : : };
105 : :
106 : : struct extent_state {
107 : : u64 start;
108 : : u64 end; /* inclusive */
109 : : struct rb_node rb_node;
110 : :
111 : : /* ADD NEW ELEMENTS AFTER THIS */
112 : : struct extent_io_tree *tree;
113 : : wait_queue_head_t wq;
114 : : atomic_t refs;
115 : : unsigned long state;
116 : :
117 : : /* for use by the FS */
118 : : u64 private;
119 : :
120 : : #ifdef CONFIG_BTRFS_DEBUG
121 : : struct list_head leak_list;
122 : : #endif
123 : : };
124 : :
125 : : #define INLINE_EXTENT_BUFFER_PAGES 16
126 : : #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
127 : : struct extent_buffer {
128 : : u64 start;
129 : : unsigned long len;
130 : : unsigned long map_start;
131 : : unsigned long map_len;
132 : : unsigned long bflags;
133 : : struct extent_io_tree *tree;
134 : : spinlock_t refs_lock;
135 : : atomic_t refs;
136 : : atomic_t io_pages;
137 : : int read_mirror;
138 : : struct rcu_head rcu_head;
139 : : pid_t lock_owner;
140 : :
141 : : /* count of read lock holders on the extent buffer */
142 : : atomic_t write_locks;
143 : : atomic_t read_locks;
144 : : atomic_t blocking_writers;
145 : : atomic_t blocking_readers;
146 : : atomic_t spinning_readers;
147 : : atomic_t spinning_writers;
148 : : int lock_nested;
149 : :
150 : : /* protects write locks */
151 : : rwlock_t lock;
152 : :
153 : : /* readers use lock_wq while they wait for the write
154 : : * lock holders to unlock
155 : : */
156 : : wait_queue_head_t write_lock_wq;
157 : :
158 : : /* writers use read_lock_wq while they wait for readers
159 : : * to unlock
160 : : */
161 : : wait_queue_head_t read_lock_wq;
162 : : wait_queue_head_t lock_wq;
163 : : struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
164 : : #ifdef CONFIG_BTRFS_DEBUG
165 : : struct list_head leak_list;
166 : : #endif
167 : : };
168 : :
169 : : static inline void extent_set_compress_type(unsigned long *bio_flags,
170 : : int compress_type)
171 : : {
172 : 0 : *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
173 : : }
174 : :
175 : : static inline int extent_compress_type(unsigned long bio_flags)
176 : : {
177 : 0 : 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);
194 : : int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
195 : : int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
196 : : unsigned long bits, struct extent_state **cached);
197 : : int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
198 : : int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
199 : : struct extent_state **cached, gfp_t mask);
200 : : int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
201 : : int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
202 : : get_extent_t *get_extent, int mirror_num);
203 : : int extent_read_full_page_nolock(struct extent_io_tree *tree, struct page *page,
204 : : get_extent_t *get_extent, int mirror_num);
205 : : int __init extent_io_init(void);
206 : : void extent_io_exit(void);
207 : :
208 : : u64 count_range_bits(struct extent_io_tree *tree,
209 : : u64 *start, u64 search_end,
210 : : u64 max_bytes, unsigned long bits, int contig);
211 : :
212 : : void free_extent_state(struct extent_state *state);
213 : : int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
214 : : unsigned long bits, int filled,
215 : : struct extent_state *cached_state);
216 : : int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
217 : : unsigned long bits, gfp_t mask);
218 : : int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
219 : : unsigned long bits, int wake, int delete,
220 : : struct extent_state **cached, gfp_t mask);
221 : : int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
222 : : unsigned long bits, gfp_t mask);
223 : : int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
224 : : unsigned long 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 clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
229 : : struct extent_state **cached_state, gfp_t mask);
230 : : int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
231 : : gfp_t mask);
232 : : int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
233 : : gfp_t mask);
234 : : int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
235 : : gfp_t mask);
236 : : int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
237 : : unsigned long bits, unsigned long clear_bits,
238 : : struct extent_state **cached_state, gfp_t mask);
239 : : int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
240 : : struct extent_state **cached_state, gfp_t mask);
241 : : int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end,
242 : : struct extent_state **cached_state, gfp_t mask);
243 : : int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
244 : : u64 *start_ret, u64 *end_ret, unsigned long bits,
245 : : struct extent_state **cached_state);
246 : : int extent_invalidatepage(struct extent_io_tree *tree,
247 : : struct page *page, unsigned long offset);
248 : : int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
249 : : get_extent_t *get_extent,
250 : : struct writeback_control *wbc);
251 : : int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
252 : : u64 start, u64 end, get_extent_t *get_extent,
253 : : int mode);
254 : : int extent_writepages(struct extent_io_tree *tree,
255 : : struct address_space *mapping,
256 : : get_extent_t *get_extent,
257 : : struct writeback_control *wbc);
258 : : int btree_write_cache_pages(struct address_space *mapping,
259 : : struct writeback_control *wbc);
260 : : int extent_readpages(struct extent_io_tree *tree,
261 : : struct address_space *mapping,
262 : : struct list_head *pages, unsigned nr_pages,
263 : : get_extent_t get_extent);
264 : : int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
265 : : __u64 start, __u64 len, get_extent_t *get_extent);
266 : : int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
267 : : void set_page_extent_mapped(struct page *page);
268 : :
269 : : struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
270 : : u64 start, unsigned long len);
271 : : struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len);
272 : : struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
273 : : struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
274 : : u64 start);
275 : : void free_extent_buffer(struct extent_buffer *eb);
276 : : void free_extent_buffer_stale(struct extent_buffer *eb);
277 : : #define WAIT_NONE 0
278 : : #define WAIT_COMPLETE 1
279 : : #define WAIT_PAGE_LOCK 2
280 : : int read_extent_buffer_pages(struct extent_io_tree *tree,
281 : : struct extent_buffer *eb, u64 start, int wait,
282 : : get_extent_t *get_extent, int mirror_num);
283 : : void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
284 : :
285 : : static inline unsigned long num_extent_pages(u64 start, u64 len)
286 : : {
287 : 0 : return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
288 : 0 : (start >> PAGE_CACHE_SHIFT);
289 : : }
290 : :
291 : : static inline struct page *extent_buffer_page(struct extent_buffer *eb,
292 : : unsigned long i)
293 : : {
294 : 0 : return eb->pages[i];
295 : : }
296 : :
297 : : static inline void extent_buffer_get(struct extent_buffer *eb)
298 : : {
299 : 0 : atomic_inc(&eb->refs);
300 : : }
301 : :
302 : : int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
303 : : unsigned long start,
304 : : unsigned long len);
305 : : void read_extent_buffer(struct extent_buffer *eb, void *dst,
306 : : unsigned long start,
307 : : unsigned long len);
308 : : void write_extent_buffer(struct extent_buffer *eb, const void *src,
309 : : unsigned long start, unsigned long len);
310 : : void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
311 : : unsigned long dst_offset, unsigned long src_offset,
312 : : unsigned long len);
313 : : void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
314 : : unsigned long src_offset, unsigned long len);
315 : : void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
316 : : unsigned long src_offset, unsigned long len);
317 : : void memset_extent_buffer(struct extent_buffer *eb, char c,
318 : : unsigned long start, unsigned long len);
319 : : void clear_extent_buffer_dirty(struct extent_buffer *eb);
320 : : int set_extent_buffer_dirty(struct extent_buffer *eb);
321 : : int set_extent_buffer_uptodate(struct extent_buffer *eb);
322 : : int clear_extent_buffer_uptodate(struct extent_buffer *eb);
323 : : int extent_buffer_uptodate(struct extent_buffer *eb);
324 : : int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
325 : : unsigned long min_len, char **map,
326 : : unsigned long *map_start,
327 : : unsigned long *map_len);
328 : : int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
329 : : int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
330 : : int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
331 : : struct page *locked_page,
332 : : unsigned long bits_to_clear,
333 : : unsigned long page_ops);
334 : : struct bio *
335 : : btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
336 : : gfp_t gfp_flags);
337 : : struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
338 : : struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask);
339 : :
340 : : struct btrfs_fs_info;
341 : :
342 : : int repair_io_failure(struct btrfs_fs_info *fs_info, u64 start,
343 : : u64 length, u64 logical, struct page *page,
344 : : int mirror_num);
345 : : int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
346 : : int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
347 : : int mirror_num);
348 : : #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
349 : : noinline u64 find_lock_delalloc_range(struct inode *inode,
350 : : struct extent_io_tree *tree,
351 : : struct page *locked_page, u64 *start,
352 : : u64 *end, u64 max_bytes);
353 : : #endif
354 : : #endif
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