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

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