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_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
22 #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
25 * flags for bio submission. The high bits indicate the compression
28 #define EXTENT_BIO_COMPRESSED 1
29 #define EXTENT_BIO_FLAG_SHIFT 16
31 /* these are bit numbers for test/set bit */
32 #define EXTENT_BUFFER_UPTODATE 0
33 #define EXTENT_BUFFER_BLOCKING 1
34 #define EXTENT_BUFFER_DIRTY 2
35 #define EXTENT_BUFFER_CORRUPT 3
37 /* these are flags for extent_clear_unlock_delalloc */
38 #define EXTENT_CLEAR_UNLOCK_PAGE 0x1
39 #define EXTENT_CLEAR_UNLOCK 0x2
40 #define EXTENT_CLEAR_DELALLOC 0x4
41 #define EXTENT_CLEAR_DIRTY 0x8
42 #define EXTENT_SET_WRITEBACK 0x10
43 #define EXTENT_END_WRITEBACK 0x20
44 #define EXTENT_SET_PRIVATE2 0x40
45 #define EXTENT_CLEAR_ACCOUNTING 0x80
48 * page->private values. Every page that is controlled by the extent
49 * map has page->private set to one.
51 #define EXTENT_PAGE_PRIVATE 1
52 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
56 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
57 struct bio *bio, int mirror_num,
58 unsigned long bio_flags, u64 bio_offset);
59 struct extent_io_ops {
60 int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
61 u64 start, u64 end, int *page_started,
62 unsigned long *nr_written);
63 int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
64 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
65 extent_submit_bio_hook_t *submit_bio_hook;
66 int (*merge_bio_hook)(struct page *page, unsigned long offset,
67 size_t size, struct bio *bio,
68 unsigned long bio_flags);
69 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
70 int (*readpage_io_failed_hook)(struct bio *bio, struct page *page,
72 struct extent_state *state);
73 int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
75 struct extent_state *state);
76 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
77 struct extent_state *state);
78 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
79 struct extent_state *state, int uptodate);
80 void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
82 void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
84 void (*merge_extent_hook)(struct inode *inode,
85 struct extent_state *new,
86 struct extent_state *other);
87 void (*split_extent_hook)(struct inode *inode,
88 struct extent_state *orig, u64 split);
89 int (*write_cache_pages_lock_hook)(struct page *page);
92 struct extent_io_tree {
94 struct radix_tree_root buffer;
95 struct address_space *mapping;
98 spinlock_t buffer_lock;
99 struct extent_io_ops *ops;
102 struct extent_state {
104 u64 end; /* inclusive */
105 struct rb_node rb_node;
107 /* ADD NEW ELEMENTS AFTER THIS */
108 struct extent_io_tree *tree;
109 wait_queue_head_t wq;
113 /* for use by the FS */
116 struct list_head leak_list;
119 struct extent_buffer {
122 unsigned long map_start;
123 unsigned long map_len;
124 struct page *first_page;
125 unsigned long bflags;
126 struct list_head leak_list;
127 struct rcu_head rcu_head;
130 /* count of read lock holders on the extent buffer */
131 atomic_t write_locks;
133 atomic_t blocking_writers;
134 atomic_t blocking_readers;
135 atomic_t spinning_readers;
136 atomic_t spinning_writers;
138 /* protects write locks */
141 /* readers use lock_wq while they wait for the write
142 * lock holders to unlock
144 wait_queue_head_t write_lock_wq;
146 /* writers use read_lock_wq while they wait for readers
149 wait_queue_head_t read_lock_wq;
152 static inline void extent_set_compress_type(unsigned long *bio_flags,
155 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
158 static inline int extent_compress_type(unsigned long bio_flags)
160 return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
163 struct extent_map_tree;
165 typedef struct extent_map *(get_extent_t)(struct inode *inode,
171 void extent_io_tree_init(struct extent_io_tree *tree,
172 struct address_space *mapping);
173 int try_release_extent_mapping(struct extent_map_tree *map,
174 struct extent_io_tree *tree, struct page *page,
176 int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
177 int try_release_extent_state(struct extent_map_tree *map,
178 struct extent_io_tree *tree, struct page *page,
180 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
181 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
182 int bits, struct extent_state **cached, gfp_t mask);
183 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
184 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
185 struct extent_state **cached, gfp_t mask);
186 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
188 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
189 get_extent_t *get_extent);
190 int __init extent_io_init(void);
191 void extent_io_exit(void);
193 u64 count_range_bits(struct extent_io_tree *tree,
194 u64 *start, u64 search_end,
195 u64 max_bytes, unsigned long bits, int contig);
197 void free_extent_state(struct extent_state *state);
198 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
199 int bits, int filled, struct extent_state *cached_state);
200 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
201 int bits, gfp_t mask);
202 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
203 int bits, int wake, int delete, struct extent_state **cached,
205 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
206 int bits, gfp_t mask);
207 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
208 int bits, int exclusive_bits, u64 *failed_start,
209 struct extent_state **cached_state, gfp_t mask);
210 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
211 struct extent_state **cached_state, gfp_t mask);
212 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
214 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
216 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
218 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
219 int bits, int clear_bits, gfp_t mask);
220 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
221 struct extent_state **cached_state, gfp_t mask);
222 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
223 u64 *start_ret, u64 *end_ret, int bits);
224 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
225 u64 start, int bits);
226 int extent_invalidatepage(struct extent_io_tree *tree,
227 struct page *page, unsigned long offset);
228 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
229 get_extent_t *get_extent,
230 struct writeback_control *wbc);
231 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
232 u64 start, u64 end, get_extent_t *get_extent,
234 int extent_writepages(struct extent_io_tree *tree,
235 struct address_space *mapping,
236 get_extent_t *get_extent,
237 struct writeback_control *wbc);
238 int extent_readpages(struct extent_io_tree *tree,
239 struct address_space *mapping,
240 struct list_head *pages, unsigned nr_pages,
241 get_extent_t get_extent);
242 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
243 __u64 start, __u64 len, get_extent_t *get_extent);
244 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
245 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
246 void set_page_extent_mapped(struct page *page);
248 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
249 u64 start, unsigned long len,
251 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
252 u64 start, unsigned long len);
253 void free_extent_buffer(struct extent_buffer *eb);
254 int read_extent_buffer_pages(struct extent_io_tree *tree,
255 struct extent_buffer *eb, u64 start, int wait,
256 get_extent_t *get_extent, int mirror_num);
258 static inline void extent_buffer_get(struct extent_buffer *eb)
260 atomic_inc(&eb->refs);
263 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
266 void read_extent_buffer(struct extent_buffer *eb, void *dst,
269 void write_extent_buffer(struct extent_buffer *eb, const void *src,
270 unsigned long start, unsigned long len);
271 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
272 unsigned long dst_offset, unsigned long src_offset,
274 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
275 unsigned long src_offset, unsigned long len);
276 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
277 unsigned long src_offset, unsigned long len);
278 void memset_extent_buffer(struct extent_buffer *eb, char c,
279 unsigned long start, unsigned long len);
280 int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
281 int clear_extent_buffer_dirty(struct extent_io_tree *tree,
282 struct extent_buffer *eb);
283 int set_extent_buffer_dirty(struct extent_io_tree *tree,
284 struct extent_buffer *eb);
285 int set_extent_buffer_uptodate(struct extent_io_tree *tree,
286 struct extent_buffer *eb);
287 int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
288 struct extent_buffer *eb,
289 struct extent_state **cached_state);
290 int extent_buffer_uptodate(struct extent_io_tree *tree,
291 struct extent_buffer *eb,
292 struct extent_state *cached_state);
293 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
294 unsigned long min_len, char **map,
295 unsigned long *map_start,
296 unsigned long *map_len);
297 int extent_range_uptodate(struct extent_io_tree *tree,
299 int extent_clear_unlock_delalloc(struct inode *inode,
300 struct extent_io_tree *tree,
301 u64 start, u64 end, struct page *locked_page,
304 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,