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_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
23 #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
26 * flags for bio submission. The high bits indicate the compression
29 #define EXTENT_BIO_COMPRESSED 1
30 #define EXTENT_BIO_TREE_LOG 2
31 #define EXTENT_BIO_PARENT_LOCKED 4
32 #define EXTENT_BIO_FLAG_SHIFT 16
34 /* these are bit numbers for test/set bit */
35 #define EXTENT_BUFFER_UPTODATE 0
36 #define EXTENT_BUFFER_DIRTY 2
37 #define EXTENT_BUFFER_CORRUPT 3
38 #define EXTENT_BUFFER_READAHEAD 4 /* this got triggered by readahead */
39 #define EXTENT_BUFFER_TREE_REF 5
40 #define EXTENT_BUFFER_STALE 6
41 #define EXTENT_BUFFER_WRITEBACK 7
42 #define EXTENT_BUFFER_READ_ERR 8 /* read IO error */
43 #define EXTENT_BUFFER_DUMMY 9
44 #define EXTENT_BUFFER_IN_TREE 10
45 #define EXTENT_BUFFER_WRITE_ERR 11 /* write IO error */
47 /* these are flags for extent_clear_unlock_delalloc */
48 #define PAGE_UNLOCK (1 << 0)
49 #define PAGE_CLEAR_DIRTY (1 << 1)
50 #define PAGE_SET_WRITEBACK (1 << 2)
51 #define PAGE_END_WRITEBACK (1 << 3)
52 #define PAGE_SET_PRIVATE2 (1 << 4)
53 #define PAGE_SET_ERROR (1 << 5)
56 * page->private values. Every page that is controlled by the extent
57 * map has page->private set to one.
59 #define EXTENT_PAGE_PRIVATE 1
65 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
66 struct bio *bio, int mirror_num,
67 unsigned long bio_flags, u64 bio_offset);
68 struct extent_io_ops {
69 int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
70 u64 start, u64 end, int *page_started,
71 unsigned long *nr_written);
72 int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
73 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
74 extent_submit_bio_hook_t *submit_bio_hook;
75 int (*merge_bio_hook)(int rw, struct page *page, unsigned long offset,
76 size_t size, struct bio *bio,
77 unsigned long bio_flags);
78 int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
79 int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset,
80 struct page *page, u64 start, u64 end,
82 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
83 struct extent_state *state, int uptodate);
84 void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
86 void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
88 void (*merge_extent_hook)(struct inode *inode,
89 struct extent_state *new,
90 struct extent_state *other);
91 void (*split_extent_hook)(struct inode *inode,
92 struct extent_state *orig, u64 split);
95 struct extent_io_tree {
97 struct address_space *mapping;
101 const struct extent_io_ops *ops;
104 struct extent_state {
106 u64 end; /* inclusive */
107 struct rb_node rb_node;
109 /* ADD NEW ELEMENTS AFTER THIS */
110 wait_queue_head_t wq;
114 /* for use by the FS */
117 #ifdef CONFIG_BTRFS_DEBUG
118 struct list_head leak_list;
122 #define INLINE_EXTENT_BUFFER_PAGES 16
123 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
124 struct extent_buffer {
127 unsigned long bflags;
128 struct btrfs_fs_info *fs_info;
129 spinlock_t refs_lock;
133 struct rcu_head rcu_head;
136 /* count of read lock holders on the extent buffer */
137 atomic_t write_locks;
139 atomic_t blocking_writers;
140 atomic_t blocking_readers;
141 atomic_t spinning_readers;
142 atomic_t spinning_writers;
144 /* >= 0 if eb belongs to a log tree, -1 otherwise */
147 /* protects write locks */
150 /* readers use lock_wq while they wait for the write
151 * lock holders to unlock
153 wait_queue_head_t write_lock_wq;
155 /* writers use read_lock_wq while they wait for readers
158 wait_queue_head_t read_lock_wq;
159 struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
160 #ifdef CONFIG_BTRFS_DEBUG
161 struct list_head leak_list;
166 * Structure to record how many bytes and which ranges are set/cleared
168 struct extent_changeset {
169 /* How many bytes are set/cleared in this operation */
173 struct ulist *range_changed;
176 static inline void extent_set_compress_type(unsigned long *bio_flags,
179 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
182 static inline int extent_compress_type(unsigned long bio_flags)
184 return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
187 struct extent_map_tree;
189 typedef struct extent_map *(get_extent_t)(struct inode *inode,
195 void extent_io_tree_init(struct extent_io_tree *tree,
196 struct address_space *mapping);
197 int try_release_extent_mapping(struct extent_map_tree *map,
198 struct extent_io_tree *tree, struct page *page,
200 int try_release_extent_buffer(struct page *page);
201 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
202 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
203 unsigned bits, struct extent_state **cached);
204 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
205 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
206 struct extent_state **cached, gfp_t mask);
207 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
208 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
209 get_extent_t *get_extent, int mirror_num);
210 int extent_read_full_page_nolock(struct extent_io_tree *tree, struct page *page,
211 get_extent_t *get_extent, int mirror_num);
212 int __init extent_io_init(void);
213 void extent_io_exit(void);
215 u64 count_range_bits(struct extent_io_tree *tree,
216 u64 *start, u64 search_end,
217 u64 max_bytes, unsigned bits, int contig);
219 void free_extent_state(struct extent_state *state);
220 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
221 unsigned bits, int filled,
222 struct extent_state *cached_state);
223 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
224 unsigned bits, gfp_t mask);
225 int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
226 unsigned bits, gfp_t mask,
227 struct extent_changeset *changeset);
228 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
229 unsigned bits, int wake, int delete,
230 struct extent_state **cached, gfp_t mask);
231 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
232 unsigned bits, gfp_t mask);
233 int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
234 unsigned bits, gfp_t mask,
235 struct extent_changeset *changeset);
236 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
237 unsigned bits, u64 *failed_start,
238 struct extent_state **cached_state, gfp_t mask);
239 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
240 struct extent_state **cached_state, gfp_t mask);
241 int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
242 struct extent_state **cached_state, gfp_t mask);
243 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
245 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
247 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
249 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
250 unsigned bits, unsigned clear_bits,
251 struct extent_state **cached_state, gfp_t mask);
252 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
253 struct extent_state **cached_state, gfp_t mask);
254 int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end,
255 struct extent_state **cached_state, gfp_t mask);
256 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
257 u64 *start_ret, u64 *end_ret, unsigned bits,
258 struct extent_state **cached_state);
259 int extent_invalidatepage(struct extent_io_tree *tree,
260 struct page *page, unsigned long offset);
261 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
262 get_extent_t *get_extent,
263 struct writeback_control *wbc);
264 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
265 u64 start, u64 end, get_extent_t *get_extent,
267 int extent_writepages(struct extent_io_tree *tree,
268 struct address_space *mapping,
269 get_extent_t *get_extent,
270 struct writeback_control *wbc);
271 int btree_write_cache_pages(struct address_space *mapping,
272 struct writeback_control *wbc);
273 int extent_readpages(struct extent_io_tree *tree,
274 struct address_space *mapping,
275 struct list_head *pages, unsigned nr_pages,
276 get_extent_t get_extent);
277 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
278 __u64 start, __u64 len, get_extent_t *get_extent);
279 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
280 void set_page_extent_mapped(struct page *page);
282 struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
284 struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
286 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
287 struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
289 void free_extent_buffer(struct extent_buffer *eb);
290 void free_extent_buffer_stale(struct extent_buffer *eb);
292 #define WAIT_COMPLETE 1
293 #define WAIT_PAGE_LOCK 2
294 int read_extent_buffer_pages(struct extent_io_tree *tree,
295 struct extent_buffer *eb, u64 start, int wait,
296 get_extent_t *get_extent, int mirror_num);
297 void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
299 static inline unsigned long num_extent_pages(u64 start, u64 len)
301 return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
302 (start >> PAGE_CACHE_SHIFT);
305 static inline void extent_buffer_get(struct extent_buffer *eb)
307 atomic_inc(&eb->refs);
310 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
313 void read_extent_buffer(struct extent_buffer *eb, void *dst,
316 int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dst,
319 void write_extent_buffer(struct extent_buffer *eb, const void *src,
320 unsigned long start, unsigned long len);
321 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
322 unsigned long dst_offset, unsigned long src_offset,
324 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
325 unsigned long src_offset, unsigned long len);
326 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
327 unsigned long src_offset, unsigned long len);
328 void memset_extent_buffer(struct extent_buffer *eb, char c,
329 unsigned long start, unsigned long len);
330 void clear_extent_buffer_dirty(struct extent_buffer *eb);
331 int set_extent_buffer_dirty(struct extent_buffer *eb);
332 int set_extent_buffer_uptodate(struct extent_buffer *eb);
333 int clear_extent_buffer_uptodate(struct extent_buffer *eb);
334 int extent_buffer_uptodate(struct extent_buffer *eb);
335 int extent_buffer_under_io(struct extent_buffer *eb);
336 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
337 unsigned long min_len, char **map,
338 unsigned long *map_start,
339 unsigned long *map_len);
340 int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
341 int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
342 int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
343 struct page *locked_page,
344 unsigned bits_to_clear,
345 unsigned long page_ops);
347 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
349 struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
350 struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask);
352 struct btrfs_fs_info;
354 int repair_io_failure(struct inode *inode, u64 start, u64 length, u64 logical,
355 struct page *page, unsigned int pg_offset,
357 int clean_io_failure(struct inode *inode, u64 start, struct page *page,
358 unsigned int pg_offset);
359 int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
360 int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
364 * When IO fails, either with EIO or csum verification fails, we
365 * try other mirrors that might have a good copy of the data. This
366 * io_failure_record is used to record state as we go through all the
367 * mirrors. If another mirror has good data, the page is set up to date
368 * and things continue. If a good mirror can't be found, the original
369 * bio end_io callback is called to indicate things have failed.
371 struct io_failure_record {
376 unsigned long bio_flags;
382 void btrfs_free_io_failure_record(struct inode *inode, u64 start, u64 end);
383 int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end,
384 struct io_failure_record **failrec_ret);
385 int btrfs_check_repairable(struct inode *inode, struct bio *failed_bio,
386 struct io_failure_record *failrec, int fail_mirror);
387 struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio,
388 struct io_failure_record *failrec,
389 struct page *page, int pg_offset, int icsum,
390 bio_end_io_t *endio_func, void *data);
391 int free_io_failure(struct inode *inode, struct io_failure_record *rec);
392 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
393 noinline u64 find_lock_delalloc_range(struct inode *inode,
394 struct extent_io_tree *tree,
395 struct page *locked_page, u64 *start,
396 u64 *end, u64 max_bytes);
398 struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,