4 #include <linux/rbtree.h>
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_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
24 #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
27 * flags for bio submission. The high bits indicate the compression
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
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 */
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)
57 * page->private values. Every page that is controlled by the extent
58 * map has page->private set to one.
60 #define EXTENT_PAGE_PRIVATE 1
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,
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,
87 void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
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);
96 struct extent_io_tree {
98 struct address_space *mapping;
102 const struct extent_io_ops *ops;
105 struct extent_state {
107 u64 end; /* inclusive */
108 struct rb_node rb_node;
110 /* ADD NEW ELEMENTS AFTER THIS */
111 wait_queue_head_t wq;
115 /* for use by the FS */
118 #ifdef CONFIG_BTRFS_DEBUG
119 struct list_head leak_list;
123 #define INLINE_EXTENT_BUFFER_PAGES 16
124 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
125 struct extent_buffer {
128 unsigned long bflags;
129 struct btrfs_fs_info *fs_info;
130 spinlock_t refs_lock;
134 struct rcu_head rcu_head;
137 /* count of read lock holders on the extent buffer */
138 atomic_t write_locks;
140 atomic_t blocking_writers;
141 atomic_t blocking_readers;
142 atomic_t spinning_readers;
143 atomic_t spinning_writers;
145 /* >= 0 if eb belongs to a log tree, -1 otherwise */
148 /* protects write locks */
151 /* readers use lock_wq while they wait for the write
152 * lock holders to unlock
154 wait_queue_head_t write_lock_wq;
156 /* writers use read_lock_wq while they wait for readers
159 wait_queue_head_t read_lock_wq;
160 struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
161 #ifdef CONFIG_BTRFS_DEBUG
162 struct list_head leak_list;
167 * Structure to record how many bytes and which ranges are set/cleared
169 struct extent_changeset {
170 /* How many bytes are set/cleared in this operation */
174 struct ulist *range_changed;
177 static inline void extent_set_compress_type(unsigned long *bio_flags,
180 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
183 static inline int extent_compress_type(unsigned long bio_flags)
185 return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
188 struct extent_map_tree;
190 typedef struct extent_map *(get_extent_t)(struct inode *inode,
196 void extent_io_tree_init(struct extent_io_tree *tree,
197 struct address_space *mapping);
198 int try_release_extent_mapping(struct extent_map_tree *map,
199 struct extent_io_tree *tree, struct page *page,
201 int try_release_extent_buffer(struct page *page);
202 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
203 struct extent_state **cached);
205 static inline int lock_extent(struct extent_io_tree *tree, u64 start, u64 end)
207 return lock_extent_bits(tree, start, end, NULL);
210 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
211 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
212 get_extent_t *get_extent, int mirror_num);
213 int extent_read_full_page_nolock(struct extent_io_tree *tree, struct page *page,
214 get_extent_t *get_extent, int mirror_num);
215 int __init extent_io_init(void);
216 void extent_io_exit(void);
218 u64 count_range_bits(struct extent_io_tree *tree,
219 u64 *start, u64 search_end,
220 u64 max_bytes, unsigned bits, int contig);
222 void free_extent_state(struct extent_state *state);
223 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
224 unsigned bits, int filled,
225 struct extent_state *cached_state);
226 int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
227 unsigned bits, gfp_t mask,
228 struct extent_changeset *changeset);
229 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
230 unsigned bits, int wake, int delete,
231 struct extent_state **cached, gfp_t mask);
233 static inline int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end)
235 return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL,
239 static inline int unlock_extent_cached(struct extent_io_tree *tree, u64 start,
240 u64 end, struct extent_state **cached, gfp_t mask)
242 return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached,
246 static inline int clear_extent_bits(struct extent_io_tree *tree, u64 start,
247 u64 end, unsigned bits, gfp_t mask)
251 if (bits & EXTENT_LOCKED)
254 return clear_extent_bit(tree, start, end, bits, wake, 0, NULL, mask);
257 int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
258 unsigned bits, gfp_t mask,
259 struct extent_changeset *changeset);
260 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
261 unsigned bits, u64 *failed_start,
262 struct extent_state **cached_state, gfp_t mask);
264 static inline int set_extent_bits(struct extent_io_tree *tree, u64 start,
265 u64 end, unsigned bits, gfp_t mask)
267 return set_extent_bit(tree, start, end, bits, NULL, NULL, mask);
270 static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
271 u64 end, struct extent_state **cached_state, gfp_t mask)
273 return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0,
277 static inline int set_extent_dirty(struct extent_io_tree *tree, u64 start,
280 return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL,
284 static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start,
287 return clear_extent_bit(tree, start, end,
288 EXTENT_DIRTY | EXTENT_DELALLOC |
289 EXTENT_DO_ACCOUNTING, 0, 0, NULL, mask);
292 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
293 unsigned bits, unsigned clear_bits,
294 struct extent_state **cached_state, gfp_t mask);
296 static inline int set_extent_delalloc(struct extent_io_tree *tree, u64 start,
297 u64 end, struct extent_state **cached_state, gfp_t mask)
299 return set_extent_bit(tree, start, end,
300 EXTENT_DELALLOC | EXTENT_UPTODATE,
301 NULL, cached_state, mask);
304 static inline int set_extent_defrag(struct extent_io_tree *tree, u64 start,
305 u64 end, struct extent_state **cached_state, gfp_t mask)
307 return set_extent_bit(tree, start, end,
308 EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG,
309 NULL, cached_state, mask);
312 static inline int set_extent_new(struct extent_io_tree *tree, u64 start,
315 return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, NULL, mask);
318 static inline int set_extent_uptodate(struct extent_io_tree *tree, u64 start,
319 u64 end, struct extent_state **cached_state, gfp_t mask)
321 return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL,
325 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
326 u64 *start_ret, u64 *end_ret, unsigned bits,
327 struct extent_state **cached_state);
328 int extent_invalidatepage(struct extent_io_tree *tree,
329 struct page *page, unsigned long offset);
330 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
331 get_extent_t *get_extent,
332 struct writeback_control *wbc);
333 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
334 u64 start, u64 end, get_extent_t *get_extent,
336 int extent_writepages(struct extent_io_tree *tree,
337 struct address_space *mapping,
338 get_extent_t *get_extent,
339 struct writeback_control *wbc);
340 int btree_write_cache_pages(struct address_space *mapping,
341 struct writeback_control *wbc);
342 int extent_readpages(struct extent_io_tree *tree,
343 struct address_space *mapping,
344 struct list_head *pages, unsigned nr_pages,
345 get_extent_t get_extent);
346 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
347 __u64 start, __u64 len, get_extent_t *get_extent);
348 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
349 void set_page_extent_mapped(struct page *page);
351 struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
353 struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
354 u64 start, unsigned long len);
355 struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
357 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
358 struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
360 void free_extent_buffer(struct extent_buffer *eb);
361 void free_extent_buffer_stale(struct extent_buffer *eb);
363 #define WAIT_COMPLETE 1
364 #define WAIT_PAGE_LOCK 2
365 int read_extent_buffer_pages(struct extent_io_tree *tree,
366 struct extent_buffer *eb, u64 start, int wait,
367 get_extent_t *get_extent, int mirror_num);
368 void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
370 static inline unsigned long num_extent_pages(u64 start, u64 len)
372 return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
373 (start >> PAGE_CACHE_SHIFT);
376 static inline void extent_buffer_get(struct extent_buffer *eb)
378 atomic_inc(&eb->refs);
381 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
384 void read_extent_buffer(struct extent_buffer *eb, void *dst,
387 int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dst,
390 void write_extent_buffer(struct extent_buffer *eb, const void *src,
391 unsigned long start, unsigned long len);
392 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
393 unsigned long dst_offset, unsigned long src_offset,
395 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
396 unsigned long src_offset, unsigned long len);
397 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
398 unsigned long src_offset, unsigned long len);
399 void memset_extent_buffer(struct extent_buffer *eb, char c,
400 unsigned long start, unsigned long len);
401 int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
403 void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
404 unsigned long pos, unsigned long len);
405 void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
406 unsigned long pos, unsigned long len);
407 void clear_extent_buffer_dirty(struct extent_buffer *eb);
408 int set_extent_buffer_dirty(struct extent_buffer *eb);
409 void set_extent_buffer_uptodate(struct extent_buffer *eb);
410 void clear_extent_buffer_uptodate(struct extent_buffer *eb);
411 int extent_buffer_uptodate(struct extent_buffer *eb);
412 int extent_buffer_under_io(struct extent_buffer *eb);
413 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
414 unsigned long min_len, char **map,
415 unsigned long *map_start,
416 unsigned long *map_len);
417 void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
418 void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
419 void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
420 struct page *locked_page,
421 unsigned bits_to_clear,
422 unsigned long page_ops);
424 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
426 struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
427 struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask);
429 struct btrfs_fs_info;
431 int repair_io_failure(struct inode *inode, u64 start, u64 length, u64 logical,
432 struct page *page, unsigned int pg_offset,
434 int clean_io_failure(struct inode *inode, u64 start, struct page *page,
435 unsigned int pg_offset);
436 void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
437 int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
441 * When IO fails, either with EIO or csum verification fails, we
442 * try other mirrors that might have a good copy of the data. This
443 * io_failure_record is used to record state as we go through all the
444 * mirrors. If another mirror has good data, the page is set up to date
445 * and things continue. If a good mirror can't be found, the original
446 * bio end_io callback is called to indicate things have failed.
448 struct io_failure_record {
453 unsigned long bio_flags;
459 void btrfs_free_io_failure_record(struct inode *inode, u64 start, u64 end);
460 int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end,
461 struct io_failure_record **failrec_ret);
462 int btrfs_check_repairable(struct inode *inode, struct bio *failed_bio,
463 struct io_failure_record *failrec, int fail_mirror);
464 struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio,
465 struct io_failure_record *failrec,
466 struct page *page, int pg_offset, int icsum,
467 bio_end_io_t *endio_func, void *data);
468 int free_io_failure(struct inode *inode, struct io_failure_record *rec);
469 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
470 noinline u64 find_lock_delalloc_range(struct inode *inode,
471 struct extent_io_tree *tree,
472 struct page *locked_page, u64 *start,
473 u64 *end, u64 max_bytes);
475 struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,