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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            (1U << 0)
  8 #define EXTENT_WRITEBACK        (1U << 1)
  9 #define EXTENT_UPTODATE         (1U << 2)
 10 #define EXTENT_LOCKED           (1U << 3)
 11 #define EXTENT_NEW              (1U << 4)
 12 #define EXTENT_DELALLOC         (1U << 5)
 13 #define EXTENT_DEFRAG           (1U << 6)
 14 #define EXTENT_BOUNDARY         (1U << 9)
 15 #define EXTENT_NODATASUM        (1U << 10)
 16 #define EXTENT_DO_ACCOUNTING    (1U << 11)
 17 #define EXTENT_FIRST_DELALLOC   (1U << 12)
 18 #define EXTENT_NEED_WAIT        (1U << 13)
 19 #define EXTENT_DAMAGED          (1U << 14)
 20 #define EXTENT_NORESERVE        (1U << 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 #define PAGE_SET_ERROR          (1 << 5)
 53 
 54 /*
 55  * page->private values.  Every page that is controlled by the extent
 56  * map has page->private set to one.
 57  */
 58 #define EXTENT_PAGE_PRIVATE 1
 59 
 60 struct extent_state;
 61 struct btrfs_root;
 62 struct btrfs_io_bio;
 63 
 64 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
 65                                        struct bio *bio, int mirror_num,
 66                                        unsigned long bio_flags, u64 bio_offset);
 67 struct extent_io_ops {
 68         int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
 69                              u64 start, u64 end, int *page_started,
 70                              unsigned long *nr_written);
 71         int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
 72         int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
 73         extent_submit_bio_hook_t *submit_bio_hook;
 74         int (*merge_bio_hook)(int rw, struct page *page, unsigned long offset,
 75                               size_t size, struct bio *bio,
 76                               unsigned long bio_flags);
 77         int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
 78         int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset,
 79                                     struct page *page, u64 start, u64 end,
 80                                     int mirror);
 81         int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
 82                                       struct extent_state *state, int uptodate);
 83         void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
 84                              unsigned *bits);
 85         void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
 86                                unsigned *bits);
 87         void (*merge_extent_hook)(struct inode *inode,
 88                                   struct extent_state *new,
 89                                   struct extent_state *other);
 90         void (*split_extent_hook)(struct inode *inode,
 91                                   struct extent_state *orig, u64 split);
 92 };
 93 
 94 struct extent_io_tree {
 95         struct rb_root state;
 96         struct address_space *mapping;
 97         u64 dirty_bytes;
 98         int track_uptodate;
 99         spinlock_t lock;
100         struct extent_io_ops *ops;
101 };
102 
103 struct extent_state {
104         u64 start;
105         u64 end; /* inclusive */
106         struct rb_node rb_node;
107 
108         /* ADD NEW ELEMENTS AFTER THIS */
109         wait_queue_head_t wq;
110         atomic_t refs;
111         unsigned state;
112 
113         /* for use by the FS */
114         u64 private;
115 
116 #ifdef CONFIG_BTRFS_DEBUG
117         struct list_head leak_list;
118 #endif
119 };
120 
121 #define INLINE_EXTENT_BUFFER_PAGES 16
122 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
123 struct extent_buffer {
124         u64 start;
125         unsigned long len;
126         unsigned long bflags;
127         struct btrfs_fs_info *fs_info;
128         spinlock_t refs_lock;
129         atomic_t refs;
130         atomic_t io_pages;
131         int read_mirror;
132         struct rcu_head rcu_head;
133         pid_t lock_owner;
134 
135         /* count of read lock holders on the extent buffer */
136         atomic_t write_locks;
137         atomic_t read_locks;
138         atomic_t blocking_writers;
139         atomic_t blocking_readers;
140         atomic_t spinning_readers;
141         atomic_t spinning_writers;
142         short lock_nested;
143         /* >= 0 if eb belongs to a log tree, -1 otherwise */
144         short log_index;
145 
146         /* protects write locks */
147         rwlock_t lock;
148 
149         /* readers use lock_wq while they wait for the write
150          * lock holders to unlock
151          */
152         wait_queue_head_t write_lock_wq;
153 
154         /* writers use read_lock_wq while they wait for readers
155          * to unlock
156          */
157         wait_queue_head_t read_lock_wq;
158         struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
159 #ifdef CONFIG_BTRFS_DEBUG
160         struct list_head leak_list;
161 #endif
162 };
163 
164 static inline void extent_set_compress_type(unsigned long *bio_flags,
165                                             int compress_type)
166 {
167         *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
168 }
169 
170 static inline int extent_compress_type(unsigned long bio_flags)
171 {
172         return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
173 }
174 
175 struct extent_map_tree;
176 
177 typedef struct extent_map *(get_extent_t)(struct inode *inode,
178                                           struct page *page,
179                                           size_t pg_offset,
180                                           u64 start, u64 len,
181                                           int create);
182 
183 void extent_io_tree_init(struct extent_io_tree *tree,
184                          struct address_space *mapping);
185 int try_release_extent_mapping(struct extent_map_tree *map,
186                                struct extent_io_tree *tree, struct page *page,
187                                gfp_t mask);
188 int try_release_extent_buffer(struct page *page);
189 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
190 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
191                      unsigned bits, struct extent_state **cached);
192 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
193 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
194                          struct extent_state **cached, gfp_t mask);
195 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
196 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
197                           get_extent_t *get_extent, int mirror_num);
198 int extent_read_full_page_nolock(struct extent_io_tree *tree, struct page *page,
199                                  get_extent_t *get_extent, int mirror_num);
200 int __init extent_io_init(void);
201 void extent_io_exit(void);
202 
203 u64 count_range_bits(struct extent_io_tree *tree,
204                      u64 *start, u64 search_end,
205                      u64 max_bytes, unsigned bits, int contig);
206 
207 void free_extent_state(struct extent_state *state);
208 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
209                    unsigned bits, int filled,
210                    struct extent_state *cached_state);
211 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
212                       unsigned bits, gfp_t mask);
213 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
214                      unsigned bits, int wake, int delete,
215                      struct extent_state **cached, gfp_t mask);
216 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
217                     unsigned bits, gfp_t mask);
218 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
219                    unsigned bits, u64 *failed_start,
220                    struct extent_state **cached_state, gfp_t mask);
221 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
222                         struct extent_state **cached_state, gfp_t mask);
223 int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
224                           struct extent_state **cached_state, gfp_t mask);
225 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
226                    gfp_t mask);
227 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
228                      gfp_t mask);
229 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
230                        gfp_t mask);
231 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
232                        unsigned bits, unsigned clear_bits,
233                        struct extent_state **cached_state, gfp_t mask);
234 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
235                         struct extent_state **cached_state, gfp_t mask);
236 int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end,
237                       struct extent_state **cached_state, gfp_t mask);
238 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
239                           u64 *start_ret, u64 *end_ret, unsigned bits,
240                           struct extent_state **cached_state);
241 int extent_invalidatepage(struct extent_io_tree *tree,
242                           struct page *page, unsigned long offset);
243 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
244                           get_extent_t *get_extent,
245                           struct writeback_control *wbc);
246 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
247                               u64 start, u64 end, get_extent_t *get_extent,
248                               int mode);
249 int extent_writepages(struct extent_io_tree *tree,
250                       struct address_space *mapping,
251                       get_extent_t *get_extent,
252                       struct writeback_control *wbc);
253 int btree_write_cache_pages(struct address_space *mapping,
254                             struct writeback_control *wbc);
255 int extent_readpages(struct extent_io_tree *tree,
256                      struct address_space *mapping,
257                      struct list_head *pages, unsigned nr_pages,
258                      get_extent_t get_extent);
259 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
260                 __u64 start, __u64 len, get_extent_t *get_extent);
261 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
262 void set_page_extent_mapped(struct page *page);
263 
264 struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
265                                           u64 start);
266 struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
267                 u64 start);
268 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
269 struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
270                                          u64 start);
271 void free_extent_buffer(struct extent_buffer *eb);
272 void free_extent_buffer_stale(struct extent_buffer *eb);
273 #define WAIT_NONE       0
274 #define WAIT_COMPLETE   1
275 #define WAIT_PAGE_LOCK  2
276 int read_extent_buffer_pages(struct extent_io_tree *tree,
277                              struct extent_buffer *eb, u64 start, int wait,
278                              get_extent_t *get_extent, int mirror_num);
279 void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
280 
281 static inline unsigned long num_extent_pages(u64 start, u64 len)
282 {
283         return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
284                 (start >> PAGE_CACHE_SHIFT);
285 }
286 
287 static inline void extent_buffer_get(struct extent_buffer *eb)
288 {
289         atomic_inc(&eb->refs);
290 }
291 
292 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
293                           unsigned long start,
294                           unsigned long len);
295 void read_extent_buffer(struct extent_buffer *eb, void *dst,
296                         unsigned long start,
297                         unsigned long len);
298 int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dst,
299                                unsigned long start,
300                                unsigned long len);
301 void write_extent_buffer(struct extent_buffer *eb, const void *src,
302                          unsigned long start, unsigned long len);
303 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
304                         unsigned long dst_offset, unsigned long src_offset,
305                         unsigned long len);
306 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
307                            unsigned long src_offset, unsigned long len);
308 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
309                            unsigned long src_offset, unsigned long len);
310 void memset_extent_buffer(struct extent_buffer *eb, char c,
311                           unsigned long start, unsigned long len);
312 void clear_extent_buffer_dirty(struct extent_buffer *eb);
313 int set_extent_buffer_dirty(struct extent_buffer *eb);
314 int set_extent_buffer_uptodate(struct extent_buffer *eb);
315 int clear_extent_buffer_uptodate(struct extent_buffer *eb);
316 int extent_buffer_uptodate(struct extent_buffer *eb);
317 int extent_buffer_under_io(struct extent_buffer *eb);
318 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
319                       unsigned long min_len, char **map,
320                       unsigned long *map_start,
321                       unsigned long *map_len);
322 int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
323 int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
324 int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
325                                  struct page *locked_page,
326                                  unsigned bits_to_clear,
327                                  unsigned long page_ops);
328 struct bio *
329 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
330                 gfp_t gfp_flags);
331 struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
332 struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask);
333 
334 struct btrfs_fs_info;
335 
336 int repair_io_failure(struct inode *inode, u64 start, u64 length, u64 logical,
337                       struct page *page, unsigned int pg_offset,
338                       int mirror_num);
339 int clean_io_failure(struct inode *inode, u64 start, struct page *page,
340                      unsigned int pg_offset);
341 int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
342 int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
343                          int mirror_num);
344 
345 /*
346  * When IO fails, either with EIO or csum verification fails, we
347  * try other mirrors that might have a good copy of the data.  This
348  * io_failure_record is used to record state as we go through all the
349  * mirrors.  If another mirror has good data, the page is set up to date
350  * and things continue.  If a good mirror can't be found, the original
351  * bio end_io callback is called to indicate things have failed.
352  */
353 struct io_failure_record {
354         struct page *page;
355         u64 start;
356         u64 len;
357         u64 logical;
358         unsigned long bio_flags;
359         int this_mirror;
360         int failed_mirror;
361         int in_validation;
362 };
363 
364 void btrfs_free_io_failure_record(struct inode *inode, u64 start, u64 end);
365 int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end,
366                                 struct io_failure_record **failrec_ret);
367 int btrfs_check_repairable(struct inode *inode, struct bio *failed_bio,
368                            struct io_failure_record *failrec, int fail_mirror);
369 struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio,
370                                     struct io_failure_record *failrec,
371                                     struct page *page, int pg_offset, int icsum,
372                                     bio_end_io_t *endio_func, void *data);
373 int free_io_failure(struct inode *inode, struct io_failure_record *rec);
374 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
375 noinline u64 find_lock_delalloc_range(struct inode *inode,
376                                       struct extent_io_tree *tree,
377                                       struct page *locked_page, u64 *start,
378                                       u64 *end, u64 max_bytes);
379 #endif
380 struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
381                                                u64 start);
382 #endif
383 

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