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TOMOYO Linux Cross Reference
Linux/fs/btrfs/extent_io.h

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  1 #ifndef __EXTENTIO__
  2 #define __EXTENTIO__
  3 
  4 #include <linux/rbtree.h>
  5 #include "ulist.h"
  6 
  7 /* bits for the extent state */
  8 #define EXTENT_DIRTY            (1U << 0)
  9 #define EXTENT_WRITEBACK        (1U << 1)
 10 #define EXTENT_UPTODATE         (1U << 2)
 11 #define EXTENT_LOCKED           (1U << 3)
 12 #define EXTENT_NEW              (1U << 4)
 13 #define EXTENT_DELALLOC         (1U << 5)
 14 #define EXTENT_DEFRAG           (1U << 6)
 15 #define EXTENT_BOUNDARY         (1U << 9)
 16 #define EXTENT_NODATASUM        (1U << 10)
 17 #define EXTENT_DO_ACCOUNTING    (1U << 11)
 18 #define EXTENT_FIRST_DELALLOC   (1U << 12)
 19 #define EXTENT_NEED_WAIT        (1U << 13)
 20 #define EXTENT_DAMAGED          (1U << 14)
 21 #define EXTENT_NORESERVE        (1U << 15)
 22 #define EXTENT_QGROUP_RESERVED  (1U << 16)
 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_FLAG_SHIFT 16
 33 
 34 /* these are bit numbers for test/set bit */
 35 #define EXTENT_BUFFER_UPTODATE 0
 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_READ_ERR 8        /* read IO error */
 43 #define EXTENT_BUFFER_DUMMY 9
 44 #define EXTENT_BUFFER_IN_TREE 10
 45 #define EXTENT_BUFFER_WRITE_ERR 11    /* write IO error */
 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 #define PAGE_SET_ERROR          (1 << 5)
 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 
 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 *bits);
 86         void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
 87                                unsigned *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 address_space *mapping;
 98         u64 dirty_bytes;
 99         int track_uptodate;
100         spinlock_t lock;
101         const struct extent_io_ops *ops;
102 };
103 
104 struct extent_state {
105         u64 start;
106         u64 end; /* inclusive */
107         struct rb_node rb_node;
108 
109         /* ADD NEW ELEMENTS AFTER THIS */
110         wait_queue_head_t wq;
111         atomic_t refs;
112         unsigned state;
113 
114         /* for use by the FS */
115         u64 private;
116 
117 #ifdef CONFIG_BTRFS_DEBUG
118         struct list_head leak_list;
119 #endif
120 };
121 
122 #define INLINE_EXTENT_BUFFER_PAGES 16
123 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
124 struct extent_buffer {
125         u64 start;
126         unsigned long len;
127         unsigned long bflags;
128         struct btrfs_fs_info *fs_info;
129         spinlock_t refs_lock;
130         atomic_t refs;
131         atomic_t io_pages;
132         int read_mirror;
133         struct rcu_head rcu_head;
134         pid_t lock_owner;
135 
136         /* count of read lock holders on the extent buffer */
137         atomic_t write_locks;
138         atomic_t read_locks;
139         atomic_t blocking_writers;
140         atomic_t blocking_readers;
141         atomic_t spinning_readers;
142         atomic_t spinning_writers;
143         short lock_nested;
144         /* >= 0 if eb belongs to a log tree, -1 otherwise */
145         short log_index;
146 
147         /* protects write locks */
148         rwlock_t lock;
149 
150         /* readers use lock_wq while they wait for the write
151          * lock holders to unlock
152          */
153         wait_queue_head_t write_lock_wq;
154 
155         /* writers use read_lock_wq while they wait for readers
156          * to unlock
157          */
158         wait_queue_head_t read_lock_wq;
159         struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
160 #ifdef CONFIG_BTRFS_DEBUG
161         struct list_head leak_list;
162 #endif
163 };
164 
165 /*
166  * Structure to record how many bytes and which ranges are set/cleared
167  */
168 struct extent_changeset {
169         /* How many bytes are set/cleared in this operation */
170         u64 bytes_changed;
171 
172         /* Changed ranges */
173         struct ulist *range_changed;
174 };
175 
176 static inline void extent_set_compress_type(unsigned long *bio_flags,
177                                             int compress_type)
178 {
179         *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
180 }
181 
182 static inline int extent_compress_type(unsigned long bio_flags)
183 {
184         return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
185 }
186 
187 struct extent_map_tree;
188 
189 typedef struct extent_map *(get_extent_t)(struct inode *inode,
190                                           struct page *page,
191                                           size_t pg_offset,
192                                           u64 start, u64 len,
193                                           int create);
194 
195 void extent_io_tree_init(struct extent_io_tree *tree,
196                          struct address_space *mapping);
197 int try_release_extent_mapping(struct extent_map_tree *map,
198                                struct extent_io_tree *tree, struct page *page,
199                                gfp_t mask);
200 int try_release_extent_buffer(struct page *page);
201 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
202                      struct extent_state **cached);
203 
204 static inline int lock_extent(struct extent_io_tree *tree, u64 start, u64 end)
205 {
206         return lock_extent_bits(tree, start, end, NULL);
207 }
208 
209 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
210 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
211                           get_extent_t *get_extent, int mirror_num);
212 int __init extent_io_init(void);
213 void extent_io_exit(void);
214 
215 u64 count_range_bits(struct extent_io_tree *tree,
216                      u64 *start, u64 search_end,
217                      u64 max_bytes, unsigned bits, int contig);
218 
219 void free_extent_state(struct extent_state *state);
220 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
221                    unsigned bits, int filled,
222                    struct extent_state *cached_state);
223 int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
224                              unsigned bits, gfp_t mask,
225                              struct extent_changeset *changeset);
226 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
227                      unsigned bits, int wake, int delete,
228                      struct extent_state **cached, gfp_t mask);
229 
230 static inline int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end)
231 {
232         return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL,
233                                 GFP_NOFS);
234 }
235 
236 static inline int unlock_extent_cached(struct extent_io_tree *tree, u64 start,
237                 u64 end, struct extent_state **cached, gfp_t mask)
238 {
239         return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached,
240                                 mask);
241 }
242 
243 static inline int clear_extent_bits(struct extent_io_tree *tree, u64 start,
244                 u64 end, unsigned bits, gfp_t mask)
245 {
246         int wake = 0;
247 
248         if (bits & EXTENT_LOCKED)
249                 wake = 1;
250 
251         return clear_extent_bit(tree, start, end, bits, wake, 0, NULL, mask);
252 }
253 
254 int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
255                            unsigned bits, gfp_t mask,
256                            struct extent_changeset *changeset);
257 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
258                    unsigned bits, u64 *failed_start,
259                    struct extent_state **cached_state, gfp_t mask);
260 
261 static inline int set_extent_bits(struct extent_io_tree *tree, u64 start,
262                 u64 end, unsigned bits, gfp_t mask)
263 {
264         return set_extent_bit(tree, start, end, bits, NULL, NULL, mask);
265 }
266 
267 static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
268                 u64 end, struct extent_state **cached_state, gfp_t mask)
269 {
270         return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0,
271                                 cached_state, mask);
272 }
273 
274 static inline int set_extent_dirty(struct extent_io_tree *tree, u64 start,
275                 u64 end, gfp_t mask)
276 {
277         return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL,
278                               NULL, mask);
279 }
280 
281 static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start,
282                 u64 end, gfp_t mask)
283 {
284         return clear_extent_bit(tree, start, end,
285                                 EXTENT_DIRTY | EXTENT_DELALLOC |
286                                 EXTENT_DO_ACCOUNTING, 0, 0, NULL, mask);
287 }
288 
289 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
290                        unsigned bits, unsigned clear_bits,
291                        struct extent_state **cached_state, gfp_t mask);
292 
293 static inline int set_extent_delalloc(struct extent_io_tree *tree, u64 start,
294                 u64 end, struct extent_state **cached_state, gfp_t mask)
295 {
296         return set_extent_bit(tree, start, end,
297                               EXTENT_DELALLOC | EXTENT_UPTODATE,
298                               NULL, cached_state, mask);
299 }
300 
301 static inline int set_extent_defrag(struct extent_io_tree *tree, u64 start,
302                 u64 end, struct extent_state **cached_state, gfp_t mask)
303 {
304         return set_extent_bit(tree, start, end,
305                               EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG,
306                               NULL, cached_state, mask);
307 }
308 
309 static inline int set_extent_new(struct extent_io_tree *tree, u64 start,
310                 u64 end, gfp_t mask)
311 {
312         return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, NULL, mask);
313 }
314 
315 static inline int set_extent_uptodate(struct extent_io_tree *tree, u64 start,
316                 u64 end, struct extent_state **cached_state, gfp_t mask)
317 {
318         return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL,
319                               cached_state, mask);
320 }
321 
322 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
323                           u64 *start_ret, u64 *end_ret, unsigned bits,
324                           struct extent_state **cached_state);
325 int extent_invalidatepage(struct extent_io_tree *tree,
326                           struct page *page, unsigned long offset);
327 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
328                           get_extent_t *get_extent,
329                           struct writeback_control *wbc);
330 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
331                               u64 start, u64 end, get_extent_t *get_extent,
332                               int mode);
333 int extent_writepages(struct extent_io_tree *tree,
334                       struct address_space *mapping,
335                       get_extent_t *get_extent,
336                       struct writeback_control *wbc);
337 int btree_write_cache_pages(struct address_space *mapping,
338                             struct writeback_control *wbc);
339 int extent_readpages(struct extent_io_tree *tree,
340                      struct address_space *mapping,
341                      struct list_head *pages, unsigned nr_pages,
342                      get_extent_t get_extent);
343 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
344                 __u64 start, __u64 len, get_extent_t *get_extent);
345 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
346 void set_page_extent_mapped(struct page *page);
347 
348 struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
349                                           u64 start);
350 struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
351                                                   u64 start, unsigned long len);
352 struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
353                                                 u64 start);
354 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
355 struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
356                                          u64 start);
357 void free_extent_buffer(struct extent_buffer *eb);
358 void free_extent_buffer_stale(struct extent_buffer *eb);
359 #define WAIT_NONE       0
360 #define WAIT_COMPLETE   1
361 #define WAIT_PAGE_LOCK  2
362 int read_extent_buffer_pages(struct extent_io_tree *tree,
363                              struct extent_buffer *eb, u64 start, int wait,
364                              get_extent_t *get_extent, int mirror_num);
365 void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
366 
367 static inline unsigned long num_extent_pages(u64 start, u64 len)
368 {
369         return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
370                 (start >> PAGE_CACHE_SHIFT);
371 }
372 
373 static inline void extent_buffer_get(struct extent_buffer *eb)
374 {
375         atomic_inc(&eb->refs);
376 }
377 
378 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
379                           unsigned long start,
380                           unsigned long len);
381 void read_extent_buffer(struct extent_buffer *eb, void *dst,
382                         unsigned long start,
383                         unsigned long len);
384 int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dst,
385                                unsigned long start,
386                                unsigned long len);
387 void write_extent_buffer(struct extent_buffer *eb, const void *src,
388                          unsigned long start, unsigned long len);
389 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
390                         unsigned long dst_offset, unsigned long src_offset,
391                         unsigned long len);
392 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
393                            unsigned long src_offset, unsigned long len);
394 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
395                            unsigned long src_offset, unsigned long len);
396 void memset_extent_buffer(struct extent_buffer *eb, char c,
397                           unsigned long start, unsigned long len);
398 int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
399                            unsigned long pos);
400 void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
401                               unsigned long pos, unsigned long len);
402 void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
403                                 unsigned long pos, unsigned long len);
404 void clear_extent_buffer_dirty(struct extent_buffer *eb);
405 int set_extent_buffer_dirty(struct extent_buffer *eb);
406 void set_extent_buffer_uptodate(struct extent_buffer *eb);
407 void clear_extent_buffer_uptodate(struct extent_buffer *eb);
408 int extent_buffer_uptodate(struct extent_buffer *eb);
409 int extent_buffer_under_io(struct extent_buffer *eb);
410 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
411                       unsigned long min_len, char **map,
412                       unsigned long *map_start,
413                       unsigned long *map_len);
414 void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
415 void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
416 void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
417                                  struct page *locked_page,
418                                  unsigned bits_to_clear,
419                                  unsigned long page_ops);
420 struct bio *
421 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
422                 gfp_t gfp_flags);
423 struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
424 struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask);
425 
426 struct btrfs_fs_info;
427 
428 int repair_io_failure(struct inode *inode, u64 start, u64 length, u64 logical,
429                       struct page *page, unsigned int pg_offset,
430                       int mirror_num);
431 int clean_io_failure(struct inode *inode, u64 start, struct page *page,
432                      unsigned int pg_offset);
433 void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
434 int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
435                          int mirror_num);
436 
437 /*
438  * When IO fails, either with EIO or csum verification fails, we
439  * try other mirrors that might have a good copy of the data.  This
440  * io_failure_record is used to record state as we go through all the
441  * mirrors.  If another mirror has good data, the page is set up to date
442  * and things continue.  If a good mirror can't be found, the original
443  * bio end_io callback is called to indicate things have failed.
444  */
445 struct io_failure_record {
446         struct page *page;
447         u64 start;
448         u64 len;
449         u64 logical;
450         unsigned long bio_flags;
451         int this_mirror;
452         int failed_mirror;
453         int in_validation;
454 };
455 
456 void btrfs_free_io_failure_record(struct inode *inode, u64 start, u64 end);
457 int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end,
458                                 struct io_failure_record **failrec_ret);
459 int btrfs_check_repairable(struct inode *inode, struct bio *failed_bio,
460                            struct io_failure_record *failrec, int fail_mirror);
461 struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio,
462                                     struct io_failure_record *failrec,
463                                     struct page *page, int pg_offset, int icsum,
464                                     bio_end_io_t *endio_func, void *data);
465 int free_io_failure(struct inode *inode, struct io_failure_record *rec);
466 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
467 noinline u64 find_lock_delalloc_range(struct inode *inode,
468                                       struct extent_io_tree *tree,
469                                       struct page *locked_page, u64 *start,
470                                       u64 *end, u64 max_bytes);
471 #endif
472 struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
473                                                u64 start);
474 #endif
475 

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