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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 
  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_BOUNDARY (1 << 9)
 15 #define EXTENT_NODATASUM (1 << 10)
 16 #define EXTENT_DO_ACCOUNTING (1 << 11)
 17 #define EXTENT_FIRST_DELALLOC (1 << 12)
 18 #define EXTENT_NEED_WAIT (1 << 13)
 19 #define EXTENT_DAMAGED (1 << 14)
 20 #define EXTENT_NORESERVE (1 << 15)
 21 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
 22 #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
 23 
 24 /*
 25  * flags for bio submission. The high bits indicate the compression
 26  * type for this bio
 27  */
 28 #define EXTENT_BIO_COMPRESSED 1
 29 #define EXTENT_BIO_TREE_LOG 2
 30 #define EXTENT_BIO_PARENT_LOCKED 4
 31 #define EXTENT_BIO_FLAG_SHIFT 16
 32 
 33 /* these are bit numbers for test/set bit */
 34 #define EXTENT_BUFFER_UPTODATE 0
 35 #define EXTENT_BUFFER_DIRTY 2
 36 #define EXTENT_BUFFER_CORRUPT 3
 37 #define EXTENT_BUFFER_READAHEAD 4       /* this got triggered by readahead */
 38 #define EXTENT_BUFFER_TREE_REF 5
 39 #define EXTENT_BUFFER_STALE 6
 40 #define EXTENT_BUFFER_WRITEBACK 7
 41 #define EXTENT_BUFFER_READ_ERR 8        /* read IO error */
 42 #define EXTENT_BUFFER_DUMMY 9
 43 #define EXTENT_BUFFER_IN_TREE 10
 44 #define EXTENT_BUFFER_WRITE_ERR 11    /* write IO error */
 45 
 46 /* these are flags for extent_clear_unlock_delalloc */
 47 #define PAGE_UNLOCK             (1 << 0)
 48 #define PAGE_CLEAR_DIRTY        (1 << 1)
 49 #define PAGE_SET_WRITEBACK      (1 << 2)
 50 #define PAGE_END_WRITEBACK      (1 << 3)
 51 #define PAGE_SET_PRIVATE2       (1 << 4)
 52 
 53 /*
 54  * page->private values.  Every page that is controlled by the extent
 55  * map has page->private set to one.
 56  */
 57 #define EXTENT_PAGE_PRIVATE 1
 58 
 59 struct extent_state;
 60 struct btrfs_root;
 61 struct btrfs_io_bio;
 62 
 63 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
 64                                        struct bio *bio, int mirror_num,
 65                                        unsigned long bio_flags, u64 bio_offset);
 66 struct extent_io_ops {
 67         int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
 68                              u64 start, u64 end, int *page_started,
 69                              unsigned long *nr_written);
 70         int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
 71         int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
 72         extent_submit_bio_hook_t *submit_bio_hook;
 73         int (*merge_bio_hook)(int rw, struct page *page, unsigned long offset,
 74                               size_t size, struct bio *bio,
 75                               unsigned long bio_flags);
 76         int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
 77         int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset,
 78                                     struct page *page, u64 start, u64 end,
 79                                     int mirror);
 80         int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
 81                                       struct extent_state *state, int uptodate);
 82         void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
 83                              unsigned long *bits);
 84         void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
 85                                unsigned long *bits);
 86         void (*merge_extent_hook)(struct inode *inode,
 87                                   struct extent_state *new,
 88                                   struct extent_state *other);
 89         void (*split_extent_hook)(struct inode *inode,
 90                                   struct extent_state *orig, u64 split);
 91 };
 92 
 93 struct extent_io_tree {
 94         struct rb_root state;
 95         struct address_space *mapping;
 96         u64 dirty_bytes;
 97         int track_uptodate;
 98         spinlock_t lock;
 99         struct extent_io_ops *ops;
100 };
101 
102 struct extent_state {
103         u64 start;
104         u64 end; /* inclusive */
105         struct rb_node rb_node;
106 
107         /* ADD NEW ELEMENTS AFTER THIS */
108         wait_queue_head_t wq;
109         atomic_t refs;
110         unsigned long state;
111 
112         /* for use by the FS */
113         u64 private;
114 
115 #ifdef CONFIG_BTRFS_DEBUG
116         struct list_head leak_list;
117 #endif
118 };
119 
120 #define INLINE_EXTENT_BUFFER_PAGES 16
121 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
122 struct extent_buffer {
123         u64 start;
124         unsigned long len;
125         unsigned long bflags;
126         struct btrfs_fs_info *fs_info;
127         spinlock_t refs_lock;
128         atomic_t refs;
129         atomic_t io_pages;
130         int read_mirror;
131         struct rcu_head rcu_head;
132         pid_t lock_owner;
133 
134         /* count of read lock holders on the extent buffer */
135         atomic_t write_locks;
136         atomic_t read_locks;
137         atomic_t blocking_writers;
138         atomic_t blocking_readers;
139         atomic_t spinning_readers;
140         atomic_t spinning_writers;
141         short lock_nested;
142         /* >= 0 if eb belongs to a log tree, -1 otherwise */
143         short log_index;
144 
145         /* protects write locks */
146         rwlock_t lock;
147 
148         /* readers use lock_wq while they wait for the write
149          * lock holders to unlock
150          */
151         wait_queue_head_t write_lock_wq;
152 
153         /* writers use read_lock_wq while they wait for readers
154          * to unlock
155          */
156         wait_queue_head_t read_lock_wq;
157         struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
158 #ifdef CONFIG_BTRFS_DEBUG
159         struct list_head leak_list;
160 #endif
161 };
162 
163 static inline void extent_set_compress_type(unsigned long *bio_flags,
164                                             int compress_type)
165 {
166         *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
167 }
168 
169 static inline int extent_compress_type(unsigned long bio_flags)
170 {
171         return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
172 }
173 
174 struct extent_map_tree;
175 
176 typedef struct extent_map *(get_extent_t)(struct inode *inode,
177                                           struct page *page,
178                                           size_t pg_offset,
179                                           u64 start, u64 len,
180                                           int create);
181 
182 void extent_io_tree_init(struct extent_io_tree *tree,
183                          struct address_space *mapping);
184 int try_release_extent_mapping(struct extent_map_tree *map,
185                                struct extent_io_tree *tree, struct page *page,
186                                gfp_t mask);
187 int try_release_extent_buffer(struct page *page);
188 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
189 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
190                      unsigned long bits, struct extent_state **cached);
191 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
192 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
193                          struct extent_state **cached, gfp_t mask);
194 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
195 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
196                           get_extent_t *get_extent, int mirror_num);
197 int extent_read_full_page_nolock(struct extent_io_tree *tree, struct page *page,
198                                  get_extent_t *get_extent, int mirror_num);
199 int __init extent_io_init(void);
200 void extent_io_exit(void);
201 
202 u64 count_range_bits(struct extent_io_tree *tree,
203                      u64 *start, u64 search_end,
204                      u64 max_bytes, unsigned long bits, int contig);
205 
206 void free_extent_state(struct extent_state *state);
207 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
208                    unsigned long bits, int filled,
209                    struct extent_state *cached_state);
210 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
211                       unsigned long bits, gfp_t mask);
212 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
213                      unsigned long bits, int wake, int delete,
214                      struct extent_state **cached, gfp_t mask);
215 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
216                     unsigned long bits, gfp_t mask);
217 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
218                    unsigned long bits, u64 *failed_start,
219                    struct extent_state **cached_state, gfp_t mask);
220 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
221                         struct extent_state **cached_state, gfp_t mask);
222 int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
223                           struct extent_state **cached_state, gfp_t mask);
224 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
225                    gfp_t mask);
226 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
227                      gfp_t mask);
228 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
229                        gfp_t mask);
230 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
231                        unsigned long bits, unsigned long clear_bits,
232                        struct extent_state **cached_state, gfp_t mask);
233 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
234                         struct extent_state **cached_state, gfp_t mask);
235 int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end,
236                       struct extent_state **cached_state, gfp_t mask);
237 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
238                           u64 *start_ret, u64 *end_ret, unsigned long bits,
239                           struct extent_state **cached_state);
240 int extent_invalidatepage(struct extent_io_tree *tree,
241                           struct page *page, unsigned long offset);
242 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
243                           get_extent_t *get_extent,
244                           struct writeback_control *wbc);
245 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
246                               u64 start, u64 end, get_extent_t *get_extent,
247                               int mode);
248 int extent_writepages(struct extent_io_tree *tree,
249                       struct address_space *mapping,
250                       get_extent_t *get_extent,
251                       struct writeback_control *wbc);
252 int btree_write_cache_pages(struct address_space *mapping,
253                             struct writeback_control *wbc);
254 int extent_readpages(struct extent_io_tree *tree,
255                      struct address_space *mapping,
256                      struct list_head *pages, unsigned nr_pages,
257                      get_extent_t get_extent);
258 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
259                 __u64 start, __u64 len, get_extent_t *get_extent);
260 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
261 void set_page_extent_mapped(struct page *page);
262 
263 struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
264                                           u64 start, unsigned long len);
265 struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len);
266 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
267 struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
268                                          u64 start);
269 void free_extent_buffer(struct extent_buffer *eb);
270 void free_extent_buffer_stale(struct extent_buffer *eb);
271 #define WAIT_NONE       0
272 #define WAIT_COMPLETE   1
273 #define WAIT_PAGE_LOCK  2
274 int read_extent_buffer_pages(struct extent_io_tree *tree,
275                              struct extent_buffer *eb, u64 start, int wait,
276                              get_extent_t *get_extent, int mirror_num);
277 void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
278 
279 static inline unsigned long num_extent_pages(u64 start, u64 len)
280 {
281         return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
282                 (start >> PAGE_CACHE_SHIFT);
283 }
284 
285 static inline void extent_buffer_get(struct extent_buffer *eb)
286 {
287         atomic_inc(&eb->refs);
288 }
289 
290 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
291                           unsigned long start,
292                           unsigned long len);
293 void read_extent_buffer(struct extent_buffer *eb, void *dst,
294                         unsigned long start,
295                         unsigned long len);
296 int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dst,
297                                unsigned long start,
298                                unsigned long len);
299 void write_extent_buffer(struct extent_buffer *eb, const void *src,
300                          unsigned long start, unsigned long len);
301 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
302                         unsigned long dst_offset, unsigned long src_offset,
303                         unsigned long len);
304 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
305                            unsigned long src_offset, unsigned long len);
306 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
307                            unsigned long src_offset, unsigned long len);
308 void memset_extent_buffer(struct extent_buffer *eb, char c,
309                           unsigned long start, unsigned long len);
310 void clear_extent_buffer_dirty(struct extent_buffer *eb);
311 int set_extent_buffer_dirty(struct extent_buffer *eb);
312 int set_extent_buffer_uptodate(struct extent_buffer *eb);
313 int clear_extent_buffer_uptodate(struct extent_buffer *eb);
314 int extent_buffer_uptodate(struct extent_buffer *eb);
315 int extent_buffer_under_io(struct extent_buffer *eb);
316 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
317                       unsigned long min_len, char **map,
318                       unsigned long *map_start,
319                       unsigned long *map_len);
320 int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
321 int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
322 int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
323                                  struct page *locked_page,
324                                  unsigned long bits_to_clear,
325                                  unsigned long page_ops);
326 struct bio *
327 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
328                 gfp_t gfp_flags);
329 struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
330 struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask);
331 
332 struct btrfs_fs_info;
333 
334 int repair_io_failure(struct inode *inode, u64 start, u64 length, u64 logical,
335                       struct page *page, unsigned int pg_offset,
336                       int mirror_num);
337 int clean_io_failure(struct inode *inode, u64 start, struct page *page,
338                      unsigned int pg_offset);
339 int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
340 int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
341                          int mirror_num);
342 
343 /*
344  * When IO fails, either with EIO or csum verification fails, we
345  * try other mirrors that might have a good copy of the data.  This
346  * io_failure_record is used to record state as we go through all the
347  * mirrors.  If another mirror has good data, the page is set up to date
348  * and things continue.  If a good mirror can't be found, the original
349  * bio end_io callback is called to indicate things have failed.
350  */
351 struct io_failure_record {
352         struct page *page;
353         u64 start;
354         u64 len;
355         u64 logical;
356         unsigned long bio_flags;
357         int this_mirror;
358         int failed_mirror;
359         int in_validation;
360 };
361 
362 void btrfs_free_io_failure_record(struct inode *inode, u64 start, u64 end);
363 int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end,
364                                 struct io_failure_record **failrec_ret);
365 int btrfs_check_repairable(struct inode *inode, struct bio *failed_bio,
366                            struct io_failure_record *failrec, int fail_mirror);
367 struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio,
368                                     struct io_failure_record *failrec,
369                                     struct page *page, int pg_offset, int icsum,
370                                     bio_end_io_t *endio_func, void *data);
371 int free_io_failure(struct inode *inode, struct io_failure_record *rec);
372 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
373 noinline u64 find_lock_delalloc_range(struct inode *inode,
374                                       struct extent_io_tree *tree,
375                                       struct page *locked_page, u64 *start,
376                                       u64 *end, u64 max_bytes);
377 #endif
378 struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
379                                                u64 start, unsigned long len);
380 #endif
381 

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