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 : : #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 : : 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 : :
168 : : static inline void extent_set_compress_type(unsigned long *bio_flags,
169 : : int compress_type)
170 : : {
171 : 0 : *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
172 : : }
173 : :
174 : : static inline int extent_compress_type(unsigned long bio_flags)
175 : : {
176 : 0 : 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 extent_read_full_page_nolock(struct extent_io_tree *tree, struct page *page,
203 : : get_extent_t *get_extent, int mirror_num);
204 : : int __init extent_io_init(void);
205 : : void extent_io_exit(void);
206 : :
207 : : u64 count_range_bits(struct extent_io_tree *tree,
208 : : u64 *start, u64 search_end,
209 : : u64 max_bytes, unsigned long bits, int contig);
210 : :
211 : : void free_extent_state(struct extent_state *state);
212 : : int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
213 : : unsigned long bits, int filled,
214 : : struct extent_state *cached_state);
215 : : int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
216 : : unsigned long bits, gfp_t mask);
217 : : int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
218 : : unsigned long bits, int wake, int delete,
219 : : struct extent_state **cached, gfp_t mask);
220 : : int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
221 : : unsigned long bits, gfp_t mask);
222 : : int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
223 : : unsigned long bits, u64 *failed_start,
224 : : struct extent_state **cached_state, gfp_t mask);
225 : : int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
226 : : struct extent_state **cached_state, gfp_t mask);
227 : : int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
228 : : struct extent_state **cached_state, gfp_t mask);
229 : : int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
230 : : gfp_t mask);
231 : : int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
232 : : gfp_t mask);
233 : : int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
234 : : gfp_t mask);
235 : : int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
236 : : unsigned long bits, unsigned long clear_bits,
237 : : struct extent_state **cached_state, gfp_t mask);
238 : : int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
239 : : struct extent_state **cached_state, gfp_t mask);
240 : : int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end,
241 : : struct extent_state **cached_state, gfp_t mask);
242 : : int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
243 : : u64 *start_ret, u64 *end_ret, unsigned long bits,
244 : : struct extent_state **cached_state);
245 : : int extent_invalidatepage(struct extent_io_tree *tree,
246 : : struct page *page, unsigned long offset);
247 : : int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
248 : : get_extent_t *get_extent,
249 : : struct writeback_control *wbc);
250 : : int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
251 : : u64 start, u64 end, get_extent_t *get_extent,
252 : : int mode);
253 : : int extent_writepages(struct extent_io_tree *tree,
254 : : struct address_space *mapping,
255 : : get_extent_t *get_extent,
256 : : struct writeback_control *wbc);
257 : : int btree_write_cache_pages(struct address_space *mapping,
258 : : struct writeback_control *wbc);
259 : : int extent_readpages(struct extent_io_tree *tree,
260 : : struct address_space *mapping,
261 : : struct list_head *pages, unsigned nr_pages,
262 : : get_extent_t get_extent);
263 : : int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
264 : : __u64 start, __u64 len, get_extent_t *get_extent);
265 : : int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
266 : : void set_page_extent_mapped(struct page *page);
267 : :
268 : : struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
269 : : u64 start, unsigned long len);
270 : : struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len);
271 : : struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
272 : : struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
273 : : u64 start);
274 : : void free_extent_buffer(struct extent_buffer *eb);
275 : : void free_extent_buffer_stale(struct extent_buffer *eb);
276 : : #define WAIT_NONE 0
277 : : #define WAIT_COMPLETE 1
278 : : #define WAIT_PAGE_LOCK 2
279 : : int read_extent_buffer_pages(struct extent_io_tree *tree,
280 : : struct extent_buffer *eb, u64 start, int wait,
281 : : get_extent_t *get_extent, int mirror_num);
282 : : void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
283 : :
284 : : static inline unsigned long num_extent_pages(u64 start, u64 len)
285 : : {
286 : 0 : return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
287 : 0 : (start >> PAGE_CACHE_SHIFT);
288 : : }
289 : :
290 : : static inline struct page *extent_buffer_page(struct extent_buffer *eb,
291 : : unsigned long i)
292 : : {
293 : 0 : return eb->pages[i];
294 : : }
295 : :
296 : : static inline void extent_buffer_get(struct extent_buffer *eb)
297 : : {
298 : 0 : atomic_inc(&eb->refs);
299 : : }
300 : :
301 : : int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
302 : : unsigned long start,
303 : : unsigned long len);
304 : : void read_extent_buffer(struct extent_buffer *eb, void *dst,
305 : : unsigned long start,
306 : : unsigned long len);
307 : : void write_extent_buffer(struct extent_buffer *eb, const void *src,
308 : : unsigned long start, unsigned long len);
309 : : void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
310 : : unsigned long dst_offset, unsigned long src_offset,
311 : : unsigned long len);
312 : : void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
313 : : unsigned long src_offset, unsigned long len);
314 : : void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
315 : : unsigned long src_offset, unsigned long len);
316 : : void memset_extent_buffer(struct extent_buffer *eb, char c,
317 : : unsigned long start, unsigned long len);
318 : : void clear_extent_buffer_dirty(struct extent_buffer *eb);
319 : : int set_extent_buffer_dirty(struct extent_buffer *eb);
320 : : int set_extent_buffer_uptodate(struct extent_buffer *eb);
321 : : int clear_extent_buffer_uptodate(struct extent_buffer *eb);
322 : : int extent_buffer_uptodate(struct extent_buffer *eb);
323 : : int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
324 : : unsigned long min_len, char **map,
325 : : unsigned long *map_start,
326 : : unsigned long *map_len);
327 : : int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
328 : : int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
329 : : int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
330 : : struct page *locked_page,
331 : : unsigned long bits_to_clear,
332 : : unsigned long page_ops);
333 : : struct bio *
334 : : btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
335 : : gfp_t gfp_flags);
336 : : struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
337 : : struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask);
338 : :
339 : : struct btrfs_fs_info;
340 : :
341 : : int repair_io_failure(struct btrfs_fs_info *fs_info, u64 start,
342 : : u64 length, u64 logical, struct page *page,
343 : : int mirror_num);
344 : : int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
345 : : int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
346 : : int mirror_num);
347 : : #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
348 : : noinline u64 find_lock_delalloc_range(struct inode *inode,
349 : : struct extent_io_tree *tree,
350 : : struct page *locked_page, u64 *start,
351 : : u64 *end, u64 max_bytes);
352 : : #endif
353 : : #endif
|
