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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_CLEAR_DATA_RESV  (1U << 17)
 24 #define EXTENT_IOBITS           (EXTENT_LOCKED | EXTENT_WRITEBACK)
 25 #define EXTENT_CTLBITS          (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
 26 
 27 /*
 28  * flags for bio submission. The high bits indicate the compression
 29  * type for this bio
 30  */
 31 #define EXTENT_BIO_COMPRESSED 1
 32 #define EXTENT_BIO_TREE_LOG 2
 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_DIRTY 2
 38 #define EXTENT_BUFFER_CORRUPT 3
 39 #define EXTENT_BUFFER_READAHEAD 4       /* this got triggered by readahead */
 40 #define EXTENT_BUFFER_TREE_REF 5
 41 #define EXTENT_BUFFER_STALE 6
 42 #define EXTENT_BUFFER_WRITEBACK 7
 43 #define EXTENT_BUFFER_READ_ERR 8        /* read IO error */
 44 #define EXTENT_BUFFER_DUMMY 9
 45 #define EXTENT_BUFFER_IN_TREE 10
 46 #define EXTENT_BUFFER_WRITE_ERR 11    /* write IO error */
 47 
 48 /* these are flags for __process_pages_contig */
 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 #define PAGE_SET_ERROR          (1 << 5)
 55 #define PAGE_LOCK               (1 << 6)
 56 
 57 /*
 58  * page->private values.  Every page that is controlled by the extent
 59  * map has page->private set to one.
 60  */
 61 #define EXTENT_PAGE_PRIVATE 1
 62 
 63 /*
 64  * The extent buffer bitmap operations are done with byte granularity instead of
 65  * word granularity for two reasons:
 66  * 1. The bitmaps must be little-endian on disk.
 67  * 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
 68  *    single word in a bitmap may straddle two pages in the extent buffer.
 69  */
 70 #define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
 71 #define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
 72 #define BITMAP_FIRST_BYTE_MASK(start) \
 73         ((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
 74 #define BITMAP_LAST_BYTE_MASK(nbits) \
 75         (BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
 76 
 77 static inline int le_test_bit(int nr, const u8 *addr)
 78 {
 79         return 1U & (addr[BIT_BYTE(nr)] >> (nr & (BITS_PER_BYTE-1)));
 80 }
 81 
 82 extern void le_bitmap_set(u8 *map, unsigned int start, int len);
 83 extern void le_bitmap_clear(u8 *map, unsigned int start, int len);
 84 
 85 struct extent_state;
 86 struct btrfs_root;
 87 struct btrfs_inode;
 88 struct btrfs_io_bio;
 89 struct io_failure_record;
 90 
 91 typedef int (extent_submit_bio_hook_t)(struct inode *inode, struct bio *bio,
 92                                        int mirror_num, unsigned long bio_flags,
 93                                        u64 bio_offset);
 94 struct extent_io_ops {
 95         /*
 96          * The following callbacks must be allways defined, the function
 97          * pointer will be called unconditionally.
 98          */
 99         extent_submit_bio_hook_t *submit_bio_hook;
100         int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset,
101                                     struct page *page, u64 start, u64 end,
102                                     int mirror);
103         int (*merge_bio_hook)(struct page *page, unsigned long offset,
104                               size_t size, struct bio *bio,
105                               unsigned long bio_flags);
106         int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
107 
108         /*
109          * Optional hooks, called if the pointer is not NULL
110          */
111         int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
112                              u64 start, u64 end, int *page_started,
113                              unsigned long *nr_written);
114 
115         int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
116         void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
117                                       struct extent_state *state, int uptodate);
118         void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
119                              unsigned *bits);
120         void (*clear_bit_hook)(struct btrfs_inode *inode,
121                         struct extent_state *state,
122                         unsigned *bits);
123         void (*merge_extent_hook)(struct inode *inode,
124                                   struct extent_state *new,
125                                   struct extent_state *other);
126         void (*split_extent_hook)(struct inode *inode,
127                                   struct extent_state *orig, u64 split);
128 };
129 
130 struct extent_io_tree {
131         struct rb_root state;
132         struct address_space *mapping;
133         u64 dirty_bytes;
134         int track_uptodate;
135         spinlock_t lock;
136         const struct extent_io_ops *ops;
137 };
138 
139 struct extent_state {
140         u64 start;
141         u64 end; /* inclusive */
142         struct rb_node rb_node;
143 
144         /* ADD NEW ELEMENTS AFTER THIS */
145         wait_queue_head_t wq;
146         atomic_t refs;
147         unsigned state;
148 
149         struct io_failure_record *failrec;
150 
151 #ifdef CONFIG_BTRFS_DEBUG
152         struct list_head leak_list;
153 #endif
154 };
155 
156 #define INLINE_EXTENT_BUFFER_PAGES 16
157 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_SIZE)
158 struct extent_buffer {
159         u64 start;
160         unsigned long len;
161         unsigned long bflags;
162         struct btrfs_fs_info *fs_info;
163         spinlock_t refs_lock;
164         atomic_t refs;
165         atomic_t io_pages;
166         int read_mirror;
167         struct rcu_head rcu_head;
168         pid_t lock_owner;
169 
170         /* count of read lock holders on the extent buffer */
171         atomic_t write_locks;
172         atomic_t read_locks;
173         atomic_t blocking_writers;
174         atomic_t blocking_readers;
175         atomic_t spinning_readers;
176         atomic_t spinning_writers;
177         short lock_nested;
178         /* >= 0 if eb belongs to a log tree, -1 otherwise */
179         short log_index;
180 
181         /* protects write locks */
182         rwlock_t lock;
183 
184         /* readers use lock_wq while they wait for the write
185          * lock holders to unlock
186          */
187         wait_queue_head_t write_lock_wq;
188 
189         /* writers use read_lock_wq while they wait for readers
190          * to unlock
191          */
192         wait_queue_head_t read_lock_wq;
193         struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
194 #ifdef CONFIG_BTRFS_DEBUG
195         struct list_head leak_list;
196 #endif
197 };
198 
199 /*
200  * Structure to record how many bytes and which ranges are set/cleared
201  */
202 struct extent_changeset {
203         /* How many bytes are set/cleared in this operation */
204         u64 bytes_changed;
205 
206         /* Changed ranges */
207         struct ulist range_changed;
208 };
209 
210 static inline void extent_set_compress_type(unsigned long *bio_flags,
211                                             int compress_type)
212 {
213         *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
214 }
215 
216 static inline int extent_compress_type(unsigned long bio_flags)
217 {
218         return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
219 }
220 
221 struct extent_map_tree;
222 
223 typedef struct extent_map *(get_extent_t)(struct btrfs_inode *inode,
224                                           struct page *page,
225                                           size_t pg_offset,
226                                           u64 start, u64 len,
227                                           int create);
228 
229 void extent_io_tree_init(struct extent_io_tree *tree,
230                          struct address_space *mapping);
231 int try_release_extent_mapping(struct extent_map_tree *map,
232                                struct extent_io_tree *tree, struct page *page,
233                                gfp_t mask);
234 int try_release_extent_buffer(struct page *page);
235 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
236                      struct extent_state **cached);
237 
238 static inline int lock_extent(struct extent_io_tree *tree, u64 start, u64 end)
239 {
240         return lock_extent_bits(tree, start, end, NULL);
241 }
242 
243 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
244 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
245                           get_extent_t *get_extent, int mirror_num);
246 int __init extent_io_init(void);
247 void extent_io_exit(void);
248 
249 u64 count_range_bits(struct extent_io_tree *tree,
250                      u64 *start, u64 search_end,
251                      u64 max_bytes, unsigned bits, int contig);
252 
253 void free_extent_state(struct extent_state *state);
254 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
255                    unsigned bits, int filled,
256                    struct extent_state *cached_state);
257 int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
258                 unsigned bits, struct extent_changeset *changeset);
259 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
260                      unsigned bits, int wake, int delete,
261                      struct extent_state **cached, gfp_t mask);
262 
263 static inline int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end)
264 {
265         return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL,
266                                 GFP_NOFS);
267 }
268 
269 static inline int unlock_extent_cached(struct extent_io_tree *tree, u64 start,
270                 u64 end, struct extent_state **cached, gfp_t mask)
271 {
272         return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached,
273                                 mask);
274 }
275 
276 static inline int clear_extent_bits(struct extent_io_tree *tree, u64 start,
277                 u64 end, unsigned bits)
278 {
279         int wake = 0;
280 
281         if (bits & EXTENT_LOCKED)
282                 wake = 1;
283 
284         return clear_extent_bit(tree, start, end, bits, wake, 0, NULL,
285                         GFP_NOFS);
286 }
287 
288 int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
289                            unsigned bits, struct extent_changeset *changeset);
290 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
291                    unsigned bits, u64 *failed_start,
292                    struct extent_state **cached_state, gfp_t mask);
293 
294 static inline int set_extent_bits(struct extent_io_tree *tree, u64 start,
295                 u64 end, unsigned bits)
296 {
297         return set_extent_bit(tree, start, end, bits, NULL, NULL, GFP_NOFS);
298 }
299 
300 static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
301                 u64 end, struct extent_state **cached_state, gfp_t mask)
302 {
303         return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0,
304                                 cached_state, mask);
305 }
306 
307 static inline int set_extent_dirty(struct extent_io_tree *tree, u64 start,
308                 u64 end, gfp_t mask)
309 {
310         return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL,
311                               NULL, mask);
312 }
313 
314 static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start,
315                 u64 end)
316 {
317         return clear_extent_bit(tree, start, end,
318                                 EXTENT_DIRTY | EXTENT_DELALLOC |
319                                 EXTENT_DO_ACCOUNTING, 0, 0, NULL, GFP_NOFS);
320 }
321 
322 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
323                        unsigned bits, unsigned clear_bits,
324                        struct extent_state **cached_state);
325 
326 static inline int set_extent_delalloc(struct extent_io_tree *tree, u64 start,
327                 u64 end, struct extent_state **cached_state)
328 {
329         return set_extent_bit(tree, start, end,
330                               EXTENT_DELALLOC | EXTENT_UPTODATE,
331                               NULL, cached_state, GFP_NOFS);
332 }
333 
334 static inline int set_extent_defrag(struct extent_io_tree *tree, u64 start,
335                 u64 end, struct extent_state **cached_state)
336 {
337         return set_extent_bit(tree, start, end,
338                               EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG,
339                               NULL, cached_state, GFP_NOFS);
340 }
341 
342 static inline int set_extent_new(struct extent_io_tree *tree, u64 start,
343                 u64 end)
344 {
345         return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, NULL,
346                         GFP_NOFS);
347 }
348 
349 static inline int set_extent_uptodate(struct extent_io_tree *tree, u64 start,
350                 u64 end, struct extent_state **cached_state, gfp_t mask)
351 {
352         return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL,
353                               cached_state, mask);
354 }
355 
356 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
357                           u64 *start_ret, u64 *end_ret, unsigned bits,
358                           struct extent_state **cached_state);
359 int extent_invalidatepage(struct extent_io_tree *tree,
360                           struct page *page, unsigned long offset);
361 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
362                           get_extent_t *get_extent,
363                           struct writeback_control *wbc);
364 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
365                               u64 start, u64 end, get_extent_t *get_extent,
366                               int mode);
367 int extent_writepages(struct extent_io_tree *tree,
368                       struct address_space *mapping,
369                       get_extent_t *get_extent,
370                       struct writeback_control *wbc);
371 int btree_write_cache_pages(struct address_space *mapping,
372                             struct writeback_control *wbc);
373 int extent_readpages(struct extent_io_tree *tree,
374                      struct address_space *mapping,
375                      struct list_head *pages, unsigned nr_pages,
376                      get_extent_t get_extent);
377 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
378                 __u64 start, __u64 len, get_extent_t *get_extent);
379 void set_page_extent_mapped(struct page *page);
380 
381 struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
382                                           u64 start);
383 struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
384                                                   u64 start, unsigned long len);
385 struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
386                                                 u64 start);
387 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
388 struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
389                                          u64 start);
390 void free_extent_buffer(struct extent_buffer *eb);
391 void free_extent_buffer_stale(struct extent_buffer *eb);
392 #define WAIT_NONE       0
393 #define WAIT_COMPLETE   1
394 #define WAIT_PAGE_LOCK  2
395 int read_extent_buffer_pages(struct extent_io_tree *tree,
396                              struct extent_buffer *eb, int wait,
397                              get_extent_t *get_extent, int mirror_num);
398 void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
399 
400 static inline unsigned long num_extent_pages(u64 start, u64 len)
401 {
402         return ((start + len + PAGE_SIZE - 1) >> PAGE_SHIFT) -
403                 (start >> PAGE_SHIFT);
404 }
405 
406 static inline void extent_buffer_get(struct extent_buffer *eb)
407 {
408         atomic_inc(&eb->refs);
409 }
410 
411 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
412                           unsigned long start,
413                           unsigned long len);
414 void read_extent_buffer(struct extent_buffer *eb, void *dst,
415                         unsigned long start,
416                         unsigned long len);
417 int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dst,
418                                unsigned long start,
419                                unsigned long len);
420 void write_extent_buffer_fsid(struct extent_buffer *eb, const void *src);
421 void write_extent_buffer_chunk_tree_uuid(struct extent_buffer *eb,
422                 const void *src);
423 void write_extent_buffer(struct extent_buffer *eb, const void *src,
424                          unsigned long start, unsigned long len);
425 void copy_extent_buffer_full(struct extent_buffer *dst,
426                              struct extent_buffer *src);
427 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
428                         unsigned long dst_offset, unsigned long src_offset,
429                         unsigned long len);
430 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
431                            unsigned long src_offset, unsigned long len);
432 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
433                            unsigned long src_offset, unsigned long len);
434 void memzero_extent_buffer(struct extent_buffer *eb, unsigned long start,
435                            unsigned long len);
436 int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
437                            unsigned long pos);
438 void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
439                               unsigned long pos, unsigned long len);
440 void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
441                                 unsigned long pos, unsigned long len);
442 void clear_extent_buffer_dirty(struct extent_buffer *eb);
443 int set_extent_buffer_dirty(struct extent_buffer *eb);
444 void set_extent_buffer_uptodate(struct extent_buffer *eb);
445 void clear_extent_buffer_uptodate(struct extent_buffer *eb);
446 int extent_buffer_uptodate(struct extent_buffer *eb);
447 int extent_buffer_under_io(struct extent_buffer *eb);
448 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
449                       unsigned long min_len, char **map,
450                       unsigned long *map_start,
451                       unsigned long *map_len);
452 void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
453 void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
454 void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
455                                  u64 delalloc_end, struct page *locked_page,
456                                  unsigned bits_to_clear,
457                                  unsigned long page_ops);
458 struct bio *
459 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
460                 gfp_t gfp_flags);
461 struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
462 struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask);
463 
464 struct btrfs_fs_info;
465 struct btrfs_inode;
466 
467 int repair_io_failure(struct btrfs_inode *inode, u64 start, u64 length,
468                 u64 logical, struct page *page,
469                 unsigned int pg_offset, int mirror_num);
470 int clean_io_failure(struct btrfs_inode *inode, u64 start,
471                 struct page *page, unsigned int pg_offset);
472 void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
473 int repair_eb_io_failure(struct btrfs_fs_info *fs_info,
474                          struct extent_buffer *eb, int mirror_num);
475 
476 /*
477  * When IO fails, either with EIO or csum verification fails, we
478  * try other mirrors that might have a good copy of the data.  This
479  * io_failure_record is used to record state as we go through all the
480  * mirrors.  If another mirror has good data, the page is set up to date
481  * and things continue.  If a good mirror can't be found, the original
482  * bio end_io callback is called to indicate things have failed.
483  */
484 struct io_failure_record {
485         struct page *page;
486         u64 start;
487         u64 len;
488         u64 logical;
489         unsigned long bio_flags;
490         int this_mirror;
491         int failed_mirror;
492         int in_validation;
493 };
494 
495 
496 void btrfs_free_io_failure_record(struct btrfs_inode *inode, u64 start,
497                 u64 end);
498 int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end,
499                                 struct io_failure_record **failrec_ret);
500 int btrfs_check_repairable(struct inode *inode, struct bio *failed_bio,
501                            struct io_failure_record *failrec, int fail_mirror);
502 struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio,
503                                     struct io_failure_record *failrec,
504                                     struct page *page, int pg_offset, int icsum,
505                                     bio_end_io_t *endio_func, void *data);
506 int free_io_failure(struct btrfs_inode *inode, struct io_failure_record *rec);
507 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
508 noinline u64 find_lock_delalloc_range(struct inode *inode,
509                                       struct extent_io_tree *tree,
510                                       struct page *locked_page, u64 *start,
511                                       u64 *end, u64 max_bytes);
512 #endif
513 struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
514                                                u64 start);
515 #endif
516 

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