~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.12-rc1 ] ~ [ linux-5.11.2 ] ~ [ linux-5.10.19 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.101 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.177 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.222 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.258 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.258 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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_DEFRAG_DONE (1 << 7)
 15 #define EXTENT_BUFFER_FILLED (1 << 8)
 16 #define EXTENT_BOUNDARY (1 << 9)
 17 #define EXTENT_NODATASUM (1 << 10)
 18 #define EXTENT_DO_ACCOUNTING (1 << 11)
 19 #define EXTENT_FIRST_DELALLOC (1 << 12)
 20 #define EXTENT_NEED_WAIT (1 << 13)
 21 #define EXTENT_DAMAGED (1 << 14)
 22 #define EXTENT_NORESERVE (1 << 15)
 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_PARENT_LOCKED 4
 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_BLOCKING 1
 38 #define EXTENT_BUFFER_DIRTY 2
 39 #define EXTENT_BUFFER_CORRUPT 3
 40 #define EXTENT_BUFFER_READAHEAD 4       /* this got triggered by readahead */
 41 #define EXTENT_BUFFER_TREE_REF 5
 42 #define EXTENT_BUFFER_STALE 6
 43 #define EXTENT_BUFFER_WRITEBACK 7
 44 #define EXTENT_BUFFER_IOERR 8
 45 #define EXTENT_BUFFER_DUMMY 9
 46 #define EXTENT_BUFFER_IN_TREE 10
 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 
 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 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
 61 
 62 struct extent_state;
 63 struct btrfs_root;
 64 struct btrfs_io_bio;
 65 
 66 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
 67                                        struct bio *bio, int mirror_num,
 68                                        unsigned long bio_flags, u64 bio_offset);
 69 struct extent_io_ops {
 70         int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
 71                              u64 start, u64 end, int *page_started,
 72                              unsigned long *nr_written);
 73         int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
 74         int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
 75         extent_submit_bio_hook_t *submit_bio_hook;
 76         int (*merge_bio_hook)(int rw, struct page *page, unsigned long offset,
 77                               size_t size, struct bio *bio,
 78                               unsigned long bio_flags);
 79         int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
 80         int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset,
 81                                     struct page *page, u64 start, u64 end,
 82                                     int mirror);
 83         int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
 84                                       struct extent_state *state, int uptodate);
 85         void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
 86                              unsigned long *bits);
 87         void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
 88                                unsigned long *bits);
 89         void (*merge_extent_hook)(struct inode *inode,
 90                                   struct extent_state *new,
 91                                   struct extent_state *other);
 92         void (*split_extent_hook)(struct inode *inode,
 93                                   struct extent_state *orig, u64 split);
 94 };
 95 
 96 struct extent_io_tree {
 97         struct rb_root state;
 98         struct address_space *mapping;
 99         u64 dirty_bytes;
100         int track_uptodate;
101         spinlock_t lock;
102         struct extent_io_ops *ops;
103 };
104 
105 struct extent_state {
106         u64 start;
107         u64 end; /* inclusive */
108         struct rb_node rb_node;
109 
110         /* ADD NEW ELEMENTS AFTER THIS */
111         struct extent_io_tree *tree;
112         wait_queue_head_t wq;
113         atomic_t refs;
114         unsigned long state;
115 
116         /* for use by the FS */
117         u64 private;
118 
119 #ifdef CONFIG_BTRFS_DEBUG
120         struct list_head leak_list;
121 #endif
122 };
123 
124 #define INLINE_EXTENT_BUFFER_PAGES 16
125 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
126 struct extent_buffer {
127         u64 start;
128         unsigned long len;
129         unsigned long map_start;
130         unsigned long map_len;
131         unsigned long bflags;
132         struct btrfs_fs_info *fs_info;
133         spinlock_t refs_lock;
134         atomic_t refs;
135         atomic_t io_pages;
136         int read_mirror;
137         struct rcu_head rcu_head;
138         pid_t lock_owner;
139 
140         /* count of read lock holders on the extent buffer */
141         atomic_t write_locks;
142         atomic_t read_locks;
143         atomic_t blocking_writers;
144         atomic_t blocking_readers;
145         atomic_t spinning_readers;
146         atomic_t spinning_writers;
147         int lock_nested;
148 
149         /* protects write locks */
150         rwlock_t lock;
151 
152         /* readers use lock_wq while they wait for the write
153          * lock holders to unlock
154          */
155         wait_queue_head_t write_lock_wq;
156 
157         /* writers use read_lock_wq while they wait for readers
158          * to unlock
159          */
160         wait_queue_head_t read_lock_wq;
161         wait_queue_head_t lock_wq;
162         struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
163 #ifdef CONFIG_BTRFS_DEBUG
164         struct list_head leak_list;
165 #endif
166 };
167 
168 static inline void extent_set_compress_type(unsigned long *bio_flags,
169                                             int compress_type)
170 {
171         *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
172 }
173 
174 static inline int extent_compress_type(unsigned long bio_flags)
175 {
176         return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
177 }
178 
179 struct extent_map_tree;
180 
181 typedef struct extent_map *(get_extent_t)(struct inode *inode,
182                                           struct page *page,
183                                           size_t pg_offset,
184                                           u64 start, u64 len,
185                                           int create);
186 
187 void extent_io_tree_init(struct extent_io_tree *tree,
188                          struct address_space *mapping);
189 int try_release_extent_mapping(struct extent_map_tree *map,
190                                struct extent_io_tree *tree, struct page *page,
191                                gfp_t mask);
192 int try_release_extent_buffer(struct page *page);
193 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
194 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
195                      unsigned long bits, struct extent_state **cached);
196 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
197 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
198                          struct extent_state **cached, gfp_t mask);
199 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
200 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
201                           get_extent_t *get_extent, int mirror_num);
202 int extent_read_full_page_nolock(struct extent_io_tree *tree, struct page *page,
203                                  get_extent_t *get_extent, int mirror_num);
204 int __init extent_io_init(void);
205 void extent_io_exit(void);
206 
207 u64 count_range_bits(struct extent_io_tree *tree,
208                      u64 *start, u64 search_end,
209                      u64 max_bytes, unsigned long bits, int contig);
210 
211 void free_extent_state(struct extent_state *state);
212 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
213                    unsigned long bits, int filled,
214                    struct extent_state *cached_state);
215 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
216                       unsigned long bits, gfp_t mask);
217 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
218                      unsigned long bits, int wake, int delete,
219                      struct extent_state **cached, gfp_t mask);
220 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
221                     unsigned long bits, gfp_t mask);
222 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
223                    unsigned long bits, u64 *failed_start,
224                    struct extent_state **cached_state, gfp_t mask);
225 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
226                         struct extent_state **cached_state, gfp_t mask);
227 int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
228                           struct extent_state **cached_state, gfp_t mask);
229 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
230                    gfp_t mask);
231 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
232                      gfp_t mask);
233 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
234                        gfp_t mask);
235 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
236                        unsigned long bits, unsigned long clear_bits,
237                        struct extent_state **cached_state, gfp_t mask);
238 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
239                         struct extent_state **cached_state, gfp_t mask);
240 int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end,
241                       struct extent_state **cached_state, gfp_t mask);
242 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
243                           u64 *start_ret, u64 *end_ret, unsigned long bits,
244                           struct extent_state **cached_state);
245 int extent_invalidatepage(struct extent_io_tree *tree,
246                           struct page *page, unsigned long offset);
247 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
248                           get_extent_t *get_extent,
249                           struct writeback_control *wbc);
250 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
251                               u64 start, u64 end, get_extent_t *get_extent,
252                               int mode);
253 int extent_writepages(struct extent_io_tree *tree,
254                       struct address_space *mapping,
255                       get_extent_t *get_extent,
256                       struct writeback_control *wbc);
257 int btree_write_cache_pages(struct address_space *mapping,
258                             struct writeback_control *wbc);
259 int extent_readpages(struct extent_io_tree *tree,
260                      struct address_space *mapping,
261                      struct list_head *pages, unsigned nr_pages,
262                      get_extent_t get_extent);
263 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
264                 __u64 start, __u64 len, get_extent_t *get_extent);
265 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
266 void set_page_extent_mapped(struct page *page);
267 
268 struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
269                                           u64 start, unsigned long len);
270 struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len);
271 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
272 struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
273                                          u64 start);
274 void free_extent_buffer(struct extent_buffer *eb);
275 void free_extent_buffer_stale(struct extent_buffer *eb);
276 #define WAIT_NONE       0
277 #define WAIT_COMPLETE   1
278 #define WAIT_PAGE_LOCK  2
279 int read_extent_buffer_pages(struct extent_io_tree *tree,
280                              struct extent_buffer *eb, u64 start, int wait,
281                              get_extent_t *get_extent, int mirror_num);
282 void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
283 
284 static inline unsigned long num_extent_pages(u64 start, u64 len)
285 {
286         return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
287                 (start >> PAGE_CACHE_SHIFT);
288 }
289 
290 static inline struct page *extent_buffer_page(struct extent_buffer *eb,
291                                               unsigned long i)
292 {
293         return eb->pages[i];
294 }
295 
296 static inline void extent_buffer_get(struct extent_buffer *eb)
297 {
298         atomic_inc(&eb->refs);
299 }
300 
301 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
302                           unsigned long start,
303                           unsigned long len);
304 void read_extent_buffer(struct extent_buffer *eb, void *dst,
305                         unsigned long start,
306                         unsigned long len);
307 void write_extent_buffer(struct extent_buffer *eb, const void *src,
308                          unsigned long start, unsigned long len);
309 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
310                         unsigned long dst_offset, unsigned long src_offset,
311                         unsigned long len);
312 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
313                            unsigned long src_offset, unsigned long len);
314 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
315                            unsigned long src_offset, unsigned long len);
316 void memset_extent_buffer(struct extent_buffer *eb, char c,
317                           unsigned long start, unsigned long len);
318 void clear_extent_buffer_dirty(struct extent_buffer *eb);
319 int set_extent_buffer_dirty(struct extent_buffer *eb);
320 int set_extent_buffer_uptodate(struct extent_buffer *eb);
321 int clear_extent_buffer_uptodate(struct extent_buffer *eb);
322 int extent_buffer_uptodate(struct extent_buffer *eb);
323 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
324                       unsigned long min_len, char **map,
325                       unsigned long *map_start,
326                       unsigned long *map_len);
327 int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
328 int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
329 int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
330                                  struct page *locked_page,
331                                  unsigned long bits_to_clear,
332                                  unsigned long page_ops);
333 struct bio *
334 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
335                 gfp_t gfp_flags);
336 struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
337 struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask);
338 
339 struct btrfs_fs_info;
340 
341 int repair_io_failure(struct btrfs_fs_info *fs_info, u64 start,
342                         u64 length, u64 logical, struct page *page,
343                         int mirror_num);
344 int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
345 int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
346                          int mirror_num);
347 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
348 noinline u64 find_lock_delalloc_range(struct inode *inode,
349                                       struct extent_io_tree *tree,
350                                       struct page *locked_page, u64 *start,
351                                       u64 *end, u64 max_bytes);
352 #endif
353 #endif
354 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp