4 #include <linux/rbtree.h>
6 /* bits for the extent state */
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)
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_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
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)
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
60 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
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 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 map_start;
129 unsigned long map_len;
130 unsigned long bflags;
131 struct btrfs_fs_info *fs_info;
132 spinlock_t refs_lock;
136 struct rcu_head rcu_head;
139 /* count of read lock holders on the extent buffer */
140 atomic_t write_locks;
142 atomic_t blocking_writers;
143 atomic_t blocking_readers;
144 atomic_t spinning_readers;
145 atomic_t spinning_writers;
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;
166 static inline void extent_set_compress_type(unsigned long *bio_flags,
169 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
172 static inline int extent_compress_type(unsigned long bio_flags)
174 return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
177 struct extent_map_tree;
179 typedef struct extent_map *(get_extent_t)(struct inode *inode,
185 void extent_io_tree_init(struct extent_io_tree *tree,
186 struct address_space *mapping);
187 int try_release_extent_mapping(struct extent_map_tree *map,
188 struct extent_io_tree *tree, struct page *page,
190 int try_release_extent_buffer(struct page *page);
191 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
192 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
193 unsigned long bits, struct extent_state **cached);
194 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
195 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
196 struct extent_state **cached, gfp_t mask);
197 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
198 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
199 get_extent_t *get_extent, int mirror_num);
200 int extent_read_full_page_nolock(struct extent_io_tree *tree, struct page *page,
201 get_extent_t *get_extent, int mirror_num);
202 int __init extent_io_init(void);
203 void extent_io_exit(void);
205 u64 count_range_bits(struct extent_io_tree *tree,
206 u64 *start, u64 search_end,
207 u64 max_bytes, unsigned long bits, int contig);
209 void free_extent_state(struct extent_state *state);
210 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
211 unsigned long bits, int filled,
212 struct extent_state *cached_state);
213 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
214 unsigned long bits, gfp_t mask);
215 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
216 unsigned long bits, int wake, int delete,
217 struct extent_state **cached, gfp_t mask);
218 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
219 unsigned long bits, gfp_t mask);
220 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
221 unsigned long bits, u64 *failed_start,
222 struct extent_state **cached_state, gfp_t mask);
223 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
224 struct extent_state **cached_state, gfp_t mask);
225 int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
226 struct extent_state **cached_state, gfp_t mask);
227 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
229 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
231 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
233 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
234 unsigned long bits, unsigned long clear_bits,
235 struct extent_state **cached_state, gfp_t mask);
236 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
237 struct extent_state **cached_state, gfp_t mask);
238 int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end,
239 struct extent_state **cached_state, gfp_t mask);
240 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
241 u64 *start_ret, u64 *end_ret, unsigned long bits,
242 struct extent_state **cached_state);
243 int extent_invalidatepage(struct extent_io_tree *tree,
244 struct page *page, unsigned long offset);
245 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
246 get_extent_t *get_extent,
247 struct writeback_control *wbc);
248 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
249 u64 start, u64 end, get_extent_t *get_extent,
251 int extent_writepages(struct extent_io_tree *tree,
252 struct address_space *mapping,
253 get_extent_t *get_extent,
254 struct writeback_control *wbc);
255 int btree_write_cache_pages(struct address_space *mapping,
256 struct writeback_control *wbc);
257 int extent_readpages(struct extent_io_tree *tree,
258 struct address_space *mapping,
259 struct list_head *pages, unsigned nr_pages,
260 get_extent_t get_extent);
261 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
262 __u64 start, __u64 len, get_extent_t *get_extent);
263 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
264 void set_page_extent_mapped(struct page *page);
266 struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
267 u64 start, unsigned long len);
268 struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len);
269 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
270 struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
272 void free_extent_buffer(struct extent_buffer *eb);
273 void free_extent_buffer_stale(struct extent_buffer *eb);
275 #define WAIT_COMPLETE 1
276 #define WAIT_PAGE_LOCK 2
277 int read_extent_buffer_pages(struct extent_io_tree *tree,
278 struct extent_buffer *eb, u64 start, int wait,
279 get_extent_t *get_extent, int mirror_num);
280 void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
282 static inline unsigned long num_extent_pages(u64 start, u64 len)
284 return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
285 (start >> PAGE_CACHE_SHIFT);
288 static inline struct page *extent_buffer_page(struct extent_buffer *eb,
294 static inline void extent_buffer_get(struct extent_buffer *eb)
296 atomic_inc(&eb->refs);
299 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
302 void read_extent_buffer(struct extent_buffer *eb, void *dst,
305 int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dst,
308 void write_extent_buffer(struct extent_buffer *eb, const void *src,
309 unsigned long start, unsigned long len);
310 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
311 unsigned long dst_offset, unsigned long src_offset,
313 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
314 unsigned long src_offset, unsigned long len);
315 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
316 unsigned long src_offset, unsigned long len);
317 void memset_extent_buffer(struct extent_buffer *eb, char c,
318 unsigned long start, unsigned long len);
319 void clear_extent_buffer_dirty(struct extent_buffer *eb);
320 int set_extent_buffer_dirty(struct extent_buffer *eb);
321 int set_extent_buffer_uptodate(struct extent_buffer *eb);
322 int clear_extent_buffer_uptodate(struct extent_buffer *eb);
323 int extent_buffer_uptodate(struct extent_buffer *eb);
324 int extent_buffer_under_io(struct extent_buffer *eb);
325 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
326 unsigned long min_len, char **map,
327 unsigned long *map_start,
328 unsigned long *map_len);
329 int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
330 int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
331 int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
332 struct page *locked_page,
333 unsigned long bits_to_clear,
334 unsigned long page_ops);
336 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
338 struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
339 struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask);
341 struct btrfs_fs_info;
343 int repair_io_failure(struct btrfs_fs_info *fs_info, u64 start,
344 u64 length, u64 logical, struct page *page,
346 int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
347 int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
349 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
350 noinline u64 find_lock_delalloc_range(struct inode *inode,
351 struct extent_io_tree *tree,
352 struct page *locked_page, u64 *start,
353 u64 *end, u64 max_bytes);
354 struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
355 u64 start, unsigned long len);