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_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_FLAG_SHIFT 16
32 /* these are bit numbers for test/set bit */
33 #define EXTENT_BUFFER_UPTODATE 0
34 #define EXTENT_BUFFER_BLOCKING 1
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_IOERR 8
43 /* these are flags for extent_clear_unlock_delalloc */
44 #define EXTENT_CLEAR_UNLOCK_PAGE 0x1
45 #define EXTENT_CLEAR_UNLOCK 0x2
46 #define EXTENT_CLEAR_DELALLOC 0x4
47 #define EXTENT_CLEAR_DIRTY 0x8
48 #define EXTENT_SET_WRITEBACK 0x10
49 #define EXTENT_END_WRITEBACK 0x20
50 #define EXTENT_SET_PRIVATE2 0x40
51 #define EXTENT_CLEAR_ACCOUNTING 0x80
54 * page->private values. Every page that is controlled by the extent
55 * map has page->private set to one.
57 #define EXTENT_PAGE_PRIVATE 1
58 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
63 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
64 struct bio *bio, int mirror_num,
65 unsigned long bio_flags, u64 bio_offset);
66 struct extent_io_ops {
67 int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
68 u64 start, u64 end, int *page_started,
69 unsigned long *nr_written);
70 int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
71 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
72 extent_submit_bio_hook_t *submit_bio_hook;
73 int (*merge_bio_hook)(struct page *page, unsigned long offset,
74 size_t size, struct bio *bio,
75 unsigned long bio_flags);
76 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
77 int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
78 int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
80 struct extent_state *state);
81 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
82 struct extent_state *state, 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,
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);
94 int (*write_cache_pages_lock_hook)(struct page *page, void *data,
95 void (*flush_fn)(void *));
98 struct extent_io_tree {
100 struct radix_tree_root buffer;
101 struct address_space *mapping;
105 spinlock_t buffer_lock;
106 struct extent_io_ops *ops;
109 struct extent_state {
111 u64 end; /* inclusive */
112 struct rb_node rb_node;
114 /* ADD NEW ELEMENTS AFTER THIS */
115 struct extent_io_tree *tree;
116 wait_queue_head_t wq;
120 /* for use by the FS */
123 struct list_head leak_list;
126 #define INLINE_EXTENT_BUFFER_PAGES 16
127 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
128 struct extent_buffer {
131 unsigned long map_start;
132 unsigned long map_len;
133 unsigned long bflags;
134 struct extent_io_tree *tree;
135 spinlock_t refs_lock;
139 struct list_head leak_list;
140 struct rcu_head rcu_head;
143 /* count of read lock holders on the extent buffer */
144 atomic_t write_locks;
146 atomic_t blocking_writers;
147 atomic_t blocking_readers;
148 atomic_t spinning_readers;
149 atomic_t spinning_writers;
152 /* protects write locks */
155 /* readers use lock_wq while they wait for the write
156 * lock holders to unlock
158 wait_queue_head_t write_lock_wq;
160 /* writers use read_lock_wq while they wait for readers
163 wait_queue_head_t read_lock_wq;
164 wait_queue_head_t lock_wq;
165 struct page *inline_pages[INLINE_EXTENT_BUFFER_PAGES];
169 static inline void extent_set_compress_type(unsigned long *bio_flags,
172 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
175 static inline int extent_compress_type(unsigned long bio_flags)
177 return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
180 struct extent_map_tree;
182 typedef struct extent_map *(get_extent_t)(struct inode *inode,
188 void extent_io_tree_init(struct extent_io_tree *tree,
189 struct address_space *mapping);
190 int try_release_extent_mapping(struct extent_map_tree *map,
191 struct extent_io_tree *tree, struct page *page,
193 int try_release_extent_buffer(struct page *page, gfp_t mask);
194 int try_release_extent_state(struct extent_map_tree *map,
195 struct extent_io_tree *tree, struct page *page,
197 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
198 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
199 int bits, struct extent_state **cached);
200 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
201 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
202 struct extent_state **cached, gfp_t mask);
203 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
204 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
205 get_extent_t *get_extent, int mirror_num);
206 int __init extent_io_init(void);
207 void extent_io_exit(void);
209 u64 count_range_bits(struct extent_io_tree *tree,
210 u64 *start, u64 search_end,
211 u64 max_bytes, unsigned long bits, int contig);
213 void free_extent_state(struct extent_state *state);
214 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
215 int bits, int filled, struct extent_state *cached_state);
216 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
217 int bits, gfp_t mask);
218 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
219 int bits, int wake, int delete, struct extent_state **cached,
221 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
222 int bits, gfp_t mask);
223 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
224 int bits, u64 *failed_start,
225 struct extent_state **cached_state, gfp_t mask);
226 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
227 struct extent_state **cached_state, gfp_t mask);
228 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
230 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
232 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
234 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
235 int bits, int clear_bits, 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 find_first_extent_bit(struct extent_io_tree *tree, u64 start,
239 u64 *start_ret, u64 *end_ret, int bits);
240 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
241 u64 start, int bits);
242 int extent_invalidatepage(struct extent_io_tree *tree,
243 struct page *page, unsigned long offset);
244 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
245 get_extent_t *get_extent,
246 struct writeback_control *wbc);
247 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
248 u64 start, u64 end, get_extent_t *get_extent,
250 int extent_writepages(struct extent_io_tree *tree,
251 struct address_space *mapping,
252 get_extent_t *get_extent,
253 struct writeback_control *wbc);
254 int btree_write_cache_pages(struct address_space *mapping,
255 struct writeback_control *wbc);
256 int extent_readpages(struct extent_io_tree *tree,
257 struct address_space *mapping,
258 struct list_head *pages, unsigned nr_pages,
259 get_extent_t get_extent);
260 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
261 __u64 start, __u64 len, get_extent_t *get_extent);
262 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
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 extent_io_tree *tree,
267 u64 start, unsigned long len);
268 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
269 u64 start, unsigned long len);
270 void free_extent_buffer(struct extent_buffer *eb);
271 void free_extent_buffer_stale(struct extent_buffer *eb);
273 #define WAIT_COMPLETE 1
274 #define WAIT_PAGE_LOCK 2
275 int read_extent_buffer_pages(struct extent_io_tree *tree,
276 struct extent_buffer *eb, u64 start, int wait,
277 get_extent_t *get_extent, int mirror_num);
278 unsigned long num_extent_pages(u64 start, u64 len);
279 struct page *extent_buffer_page(struct extent_buffer *eb, unsigned long i);
281 static inline void extent_buffer_get(struct extent_buffer *eb)
283 atomic_inc(&eb->refs);
286 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
289 void read_extent_buffer(struct extent_buffer *eb, void *dst,
292 void write_extent_buffer(struct extent_buffer *eb, const void *src,
293 unsigned long start, unsigned long len);
294 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
295 unsigned long dst_offset, unsigned long src_offset,
297 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
298 unsigned long src_offset, unsigned long len);
299 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
300 unsigned long src_offset, unsigned long len);
301 void memset_extent_buffer(struct extent_buffer *eb, char c,
302 unsigned long start, unsigned long len);
303 void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
304 void clear_extent_buffer_dirty(struct extent_buffer *eb);
305 int set_extent_buffer_dirty(struct extent_buffer *eb);
306 int set_extent_buffer_uptodate(struct extent_buffer *eb);
307 int clear_extent_buffer_uptodate(struct extent_buffer *eb);
308 int extent_buffer_uptodate(struct extent_buffer *eb);
309 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
310 unsigned long min_len, char **map,
311 unsigned long *map_start,
312 unsigned long *map_len);
313 int extent_range_uptodate(struct extent_io_tree *tree,
315 int extent_clear_unlock_delalloc(struct inode *inode,
316 struct extent_io_tree *tree,
317 u64 start, u64 end, struct page *locked_page,
320 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
323 struct btrfs_mapping_tree;
325 int repair_io_failure(struct btrfs_mapping_tree *map_tree, u64 start,
326 u64 length, u64 logical, struct page *page,
328 int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
329 int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,