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1#ifndef __EXTENTIO__
2#define __EXTENTIO__
3
4#include <linux/rbtree.h>
5
6/* bits for the extent state */
7#define EXTENT_DIRTY 1
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_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
21#define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
22
23/*
24 * flags for bio submission. The high bits indicate the compression
25 * type for this bio
26 */
27#define EXTENT_BIO_COMPRESSED 1
28#define EXTENT_BIO_FLAG_SHIFT 16
29
30/* these are bit numbers for test/set bit */
31#define EXTENT_BUFFER_UPTODATE 0
32#define EXTENT_BUFFER_BLOCKING 1
33#define EXTENT_BUFFER_DIRTY 2
34#define EXTENT_BUFFER_CORRUPT 3
35
36/* these are flags for extent_clear_unlock_delalloc */
37#define EXTENT_CLEAR_UNLOCK_PAGE 0x1
38#define EXTENT_CLEAR_UNLOCK 0x2
39#define EXTENT_CLEAR_DELALLOC 0x4
40#define EXTENT_CLEAR_DIRTY 0x8
41#define EXTENT_SET_WRITEBACK 0x10
42#define EXTENT_END_WRITEBACK 0x20
43#define EXTENT_SET_PRIVATE2 0x40
44#define EXTENT_CLEAR_ACCOUNTING 0x80
45
46/*
47 * page->private values. Every page that is controlled by the extent
48 * map has page->private set to one.
49 */
50#define EXTENT_PAGE_PRIVATE 1
51#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
52
53struct extent_state;
54
55typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
56 struct bio *bio, int mirror_num,
57 unsigned long bio_flags, u64 bio_offset);
58struct extent_io_ops {
59 int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
60 u64 start, u64 end, int *page_started,
61 unsigned long *nr_written);
62 int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
63 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
64 extent_submit_bio_hook_t *submit_bio_hook;
65 int (*merge_bio_hook)(struct page *page, unsigned long offset,
66 size_t size, struct bio *bio,
67 unsigned long bio_flags);
68 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
69 int (*readpage_io_failed_hook)(struct bio *bio, struct page *page,
70 u64 start, u64 end,
71 struct extent_state *state);
72 int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
73 u64 start, u64 end,
74 struct extent_state *state);
75 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
76 struct extent_state *state);
77 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
78 struct extent_state *state, int uptodate);
79 void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
80 int *bits);
81 void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
82 int *bits);
83 void (*merge_extent_hook)(struct inode *inode,
84 struct extent_state *new,
85 struct extent_state *other);
86 void (*split_extent_hook)(struct inode *inode,
87 struct extent_state *orig, u64 split);
88 int (*write_cache_pages_lock_hook)(struct page *page);
89};
90
91struct extent_io_tree {
92 struct rb_root state;
93 struct radix_tree_root buffer;
94 struct address_space *mapping;
95 u64 dirty_bytes;
96 spinlock_t lock;
97 spinlock_t buffer_lock;
98 struct extent_io_ops *ops;
99};
100
101struct extent_state {
102 u64 start;
103 u64 end; /* inclusive */
104 struct rb_node rb_node;
105
106 /* ADD NEW ELEMENTS AFTER THIS */
107 struct extent_io_tree *tree;
108 wait_queue_head_t wq;
109 atomic_t refs;
110 unsigned long state;
111
112 /* for use by the FS */
113 u64 private;
114
115 struct list_head leak_list;
116};
117
118struct extent_buffer {
119 u64 start;
120 unsigned long len;
121 unsigned long map_start;
122 unsigned long map_len;
123 struct page *first_page;
124 unsigned long bflags;
125 struct list_head leak_list;
126 struct rcu_head rcu_head;
127 atomic_t refs;
128
129 /* count of read lock holders on the extent buffer */
130 atomic_t write_locks;
131 atomic_t read_locks;
132 atomic_t blocking_writers;
133 atomic_t blocking_readers;
134 atomic_t spinning_readers;
135 atomic_t spinning_writers;
136
137 /* protects write locks */
138 rwlock_t lock;
139
140 /* readers use lock_wq while they wait for the write
141 * lock holders to unlock
142 */
143 wait_queue_head_t write_lock_wq;
144
145 /* writers use read_lock_wq while they wait for readers
146 * to unlock
147 */
148 wait_queue_head_t read_lock_wq;
149};
150
151static inline void extent_set_compress_type(unsigned long *bio_flags,
152 int compress_type)
153{
154 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
155}
156
157static inline int extent_compress_type(unsigned long bio_flags)
158{
159 return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
160}
161
162struct extent_map_tree;
163
164typedef struct extent_map *(get_extent_t)(struct inode *inode,
165 struct page *page,
166 size_t pg_offset,
167 u64 start, u64 len,
168 int create);
169
170void extent_io_tree_init(struct extent_io_tree *tree,
171 struct address_space *mapping);
172int try_release_extent_mapping(struct extent_map_tree *map,
173 struct extent_io_tree *tree, struct page *page,
174 gfp_t mask);
175int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
176int try_release_extent_state(struct extent_map_tree *map,
177 struct extent_io_tree *tree, struct page *page,
178 gfp_t mask);
179int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
180int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
181 int bits, struct extent_state **cached, gfp_t mask);
182int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
183int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
184 struct extent_state **cached, gfp_t mask);
185int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
186 gfp_t mask);
187int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
188 get_extent_t *get_extent);
189int __init extent_io_init(void);
190void extent_io_exit(void);
191
192u64 count_range_bits(struct extent_io_tree *tree,
193 u64 *start, u64 search_end,
194 u64 max_bytes, unsigned long bits, int contig);
195
196void free_extent_state(struct extent_state *state);
197int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
198 int bits, int filled, struct extent_state *cached_state);
199int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
200 int bits, gfp_t mask);
201int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
202 int bits, int wake, int delete, struct extent_state **cached,
203 gfp_t mask);
204int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
205 int bits, gfp_t mask);
206int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
207 int bits, int exclusive_bits, u64 *failed_start,
208 struct extent_state **cached_state, gfp_t mask);
209int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
210 struct extent_state **cached_state, gfp_t mask);
211int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
212 gfp_t mask);
213int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
214 gfp_t mask);
215int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
216 gfp_t mask);
217int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
218 struct extent_state **cached_state, gfp_t mask);
219int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
220 u64 *start_ret, u64 *end_ret, int bits);
221struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
222 u64 start, int bits);
223int extent_invalidatepage(struct extent_io_tree *tree,
224 struct page *page, unsigned long offset);
225int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
226 get_extent_t *get_extent,
227 struct writeback_control *wbc);
228int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
229 u64 start, u64 end, get_extent_t *get_extent,
230 int mode);
231int extent_writepages(struct extent_io_tree *tree,
232 struct address_space *mapping,
233 get_extent_t *get_extent,
234 struct writeback_control *wbc);
235int extent_readpages(struct extent_io_tree *tree,
236 struct address_space *mapping,
237 struct list_head *pages, unsigned nr_pages,
238 get_extent_t get_extent);
239int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
240 __u64 start, __u64 len, get_extent_t *get_extent);
241int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
242int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
243void set_page_extent_mapped(struct page *page);
244
245struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
246 u64 start, unsigned long len,
247 struct page *page0);
248struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
249 u64 start, unsigned long len);
250void free_extent_buffer(struct extent_buffer *eb);
251int read_extent_buffer_pages(struct extent_io_tree *tree,
252 struct extent_buffer *eb, u64 start, int wait,
253 get_extent_t *get_extent, int mirror_num);
254
255static inline void extent_buffer_get(struct extent_buffer *eb)
256{
257 atomic_inc(&eb->refs);
258}
259
260int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
261 unsigned long start,
262 unsigned long len);
263void read_extent_buffer(struct extent_buffer *eb, void *dst,
264 unsigned long start,
265 unsigned long len);
266void write_extent_buffer(struct extent_buffer *eb, const void *src,
267 unsigned long start, unsigned long len);
268void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
269 unsigned long dst_offset, unsigned long src_offset,
270 unsigned long len);
271void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
272 unsigned long src_offset, unsigned long len);
273void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
274 unsigned long src_offset, unsigned long len);
275void memset_extent_buffer(struct extent_buffer *eb, char c,
276 unsigned long start, unsigned long len);
277int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
278int clear_extent_buffer_dirty(struct extent_io_tree *tree,
279 struct extent_buffer *eb);
280int set_extent_buffer_dirty(struct extent_io_tree *tree,
281 struct extent_buffer *eb);
282int set_extent_buffer_uptodate(struct extent_io_tree *tree,
283 struct extent_buffer *eb);
284int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
285 struct extent_buffer *eb,
286 struct extent_state **cached_state);
287int extent_buffer_uptodate(struct extent_io_tree *tree,
288 struct extent_buffer *eb,
289 struct extent_state *cached_state);
290int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
291 unsigned long min_len, char **map,
292 unsigned long *map_start,
293 unsigned long *map_len);
294int extent_range_uptodate(struct extent_io_tree *tree,
295 u64 start, u64 end);
296int extent_clear_unlock_delalloc(struct inode *inode,
297 struct extent_io_tree *tree,
298 u64 start, u64 end, struct page *locked_page,
299 unsigned long op);
300struct bio *
301btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
302 gfp_t gfp_flags);
303#endif
1#ifndef __EXTENTIO__
2#define __EXTENTIO__
3
4#include <linux/rbtree.h>
5
6/* bits for the extent state */
7#define EXTENT_DIRTY 1
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)
25
26/*
27 * flags for bio submission. The high bits indicate the compression
28 * type for this bio
29 */
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
34
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
47
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
55/*
56 * page->private values. Every page that is controlled by the extent
57 * map has page->private set to one.
58 */
59#define EXTENT_PAGE_PRIVATE 1
60#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
61
62struct extent_state;
63struct btrfs_root;
64struct btrfs_io_bio;
65
66typedef 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);
69struct 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,
82 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,
86 unsigned long *bits);
87 void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
88 unsigned long *bits);
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};
95
96struct extent_io_tree {
97 struct rb_root state;
98 struct address_space *mapping;
99 u64 dirty_bytes;
100 int track_uptodate;
101 spinlock_t lock;
102 struct extent_io_ops *ops;
103};
104
105struct extent_state {
106 u64 start;
107 u64 end; /* inclusive */
108 struct rb_node rb_node;
109
110 /* ADD NEW ELEMENTS AFTER THIS */
111 struct extent_io_tree *tree;
112 wait_queue_head_t wq;
113 atomic_t refs;
114 unsigned long state;
115
116 /* for use by the FS */
117 u64 private;
118
119#ifdef CONFIG_BTRFS_DEBUG
120 struct list_head leak_list;
121#endif
122};
123
124#define INLINE_EXTENT_BUFFER_PAGES 16
125#define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
126struct extent_buffer {
127 u64 start;
128 unsigned long len;
129 unsigned long map_start;
130 unsigned long map_len;
131 unsigned long bflags;
132 struct btrfs_fs_info *fs_info;
133 spinlock_t refs_lock;
134 atomic_t refs;
135 atomic_t io_pages;
136 int read_mirror;
137 struct rcu_head rcu_head;
138 pid_t lock_owner;
139
140 /* count of read lock holders on the extent buffer */
141 atomic_t write_locks;
142 atomic_t read_locks;
143 atomic_t blocking_writers;
144 atomic_t blocking_readers;
145 atomic_t spinning_readers;
146 atomic_t spinning_writers;
147 int lock_nested;
148
149 /* protects write locks */
150 rwlock_t lock;
151
152 /* readers use lock_wq while they wait for the write
153 * lock holders to unlock
154 */
155 wait_queue_head_t write_lock_wq;
156
157 /* writers use read_lock_wq while they wait for readers
158 * to unlock
159 */
160 wait_queue_head_t read_lock_wq;
161 wait_queue_head_t lock_wq;
162 struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
163#ifdef CONFIG_BTRFS_DEBUG
164 struct list_head leak_list;
165#endif
166};
167
168static inline void extent_set_compress_type(unsigned long *bio_flags,
169 int compress_type)
170{
171 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
172}
173
174static inline int extent_compress_type(unsigned long bio_flags)
175{
176 return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
177}
178
179struct extent_map_tree;
180
181typedef struct extent_map *(get_extent_t)(struct inode *inode,
182 struct page *page,
183 size_t pg_offset,
184 u64 start, u64 len,
185 int create);
186
187void extent_io_tree_init(struct extent_io_tree *tree,
188 struct address_space *mapping);
189int try_release_extent_mapping(struct extent_map_tree *map,
190 struct extent_io_tree *tree, struct page *page,
191 gfp_t mask);
192int try_release_extent_buffer(struct page *page);
193int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
194int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
195 unsigned long bits, struct extent_state **cached);
196int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
197int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
198 struct extent_state **cached, gfp_t mask);
199int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
200int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
201 get_extent_t *get_extent, int mirror_num);
202int extent_read_full_page_nolock(struct extent_io_tree *tree, struct page *page,
203 get_extent_t *get_extent, int mirror_num);
204int __init extent_io_init(void);
205void extent_io_exit(void);
206
207u64 count_range_bits(struct extent_io_tree *tree,
208 u64 *start, u64 search_end,
209 u64 max_bytes, unsigned long bits, int contig);
210
211void free_extent_state(struct extent_state *state);
212int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
213 unsigned long bits, int filled,
214 struct extent_state *cached_state);
215int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
216 unsigned long bits, gfp_t mask);
217int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
218 unsigned long bits, int wake, int delete,
219 struct extent_state **cached, gfp_t mask);
220int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
221 unsigned long bits, gfp_t mask);
222int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
223 unsigned long bits, u64 *failed_start,
224 struct extent_state **cached_state, gfp_t mask);
225int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
226 struct extent_state **cached_state, gfp_t mask);
227int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
228 struct extent_state **cached_state, gfp_t mask);
229int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
230 gfp_t mask);
231int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
232 gfp_t mask);
233int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
234 gfp_t mask);
235int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
236 unsigned long bits, unsigned long clear_bits,
237 struct extent_state **cached_state, gfp_t mask);
238int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
239 struct extent_state **cached_state, gfp_t mask);
240int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end,
241 struct extent_state **cached_state, gfp_t mask);
242int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
243 u64 *start_ret, u64 *end_ret, unsigned long bits,
244 struct extent_state **cached_state);
245int extent_invalidatepage(struct extent_io_tree *tree,
246 struct page *page, unsigned long offset);
247int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
248 get_extent_t *get_extent,
249 struct writeback_control *wbc);
250int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
251 u64 start, u64 end, get_extent_t *get_extent,
252 int mode);
253int extent_writepages(struct extent_io_tree *tree,
254 struct address_space *mapping,
255 get_extent_t *get_extent,
256 struct writeback_control *wbc);
257int btree_write_cache_pages(struct address_space *mapping,
258 struct writeback_control *wbc);
259int extent_readpages(struct extent_io_tree *tree,
260 struct address_space *mapping,
261 struct list_head *pages, unsigned nr_pages,
262 get_extent_t get_extent);
263int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
264 __u64 start, __u64 len, get_extent_t *get_extent);
265int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
266void set_page_extent_mapped(struct page *page);
267
268struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
269 u64 start, unsigned long len);
270struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len);
271struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
272struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
273 u64 start);
274void free_extent_buffer(struct extent_buffer *eb);
275void free_extent_buffer_stale(struct extent_buffer *eb);
276#define WAIT_NONE 0
277#define WAIT_COMPLETE 1
278#define WAIT_PAGE_LOCK 2
279int read_extent_buffer_pages(struct extent_io_tree *tree,
280 struct extent_buffer *eb, u64 start, int wait,
281 get_extent_t *get_extent, int mirror_num);
282void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
283
284static inline unsigned long num_extent_pages(u64 start, u64 len)
285{
286 return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
287 (start >> PAGE_CACHE_SHIFT);
288}
289
290static inline struct page *extent_buffer_page(struct extent_buffer *eb,
291 unsigned long i)
292{
293 return eb->pages[i];
294}
295
296static inline void extent_buffer_get(struct extent_buffer *eb)
297{
298 atomic_inc(&eb->refs);
299}
300
301int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
302 unsigned long start,
303 unsigned long len);
304void read_extent_buffer(struct extent_buffer *eb, void *dst,
305 unsigned long start,
306 unsigned long len);
307void write_extent_buffer(struct extent_buffer *eb, const void *src,
308 unsigned long start, unsigned long len);
309void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
310 unsigned long dst_offset, unsigned long src_offset,
311 unsigned long len);
312void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
313 unsigned long src_offset, unsigned long len);
314void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
315 unsigned long src_offset, unsigned long len);
316void memset_extent_buffer(struct extent_buffer *eb, char c,
317 unsigned long start, unsigned long len);
318void clear_extent_buffer_dirty(struct extent_buffer *eb);
319int set_extent_buffer_dirty(struct extent_buffer *eb);
320int set_extent_buffer_uptodate(struct extent_buffer *eb);
321int clear_extent_buffer_uptodate(struct extent_buffer *eb);
322int extent_buffer_uptodate(struct extent_buffer *eb);
323int extent_buffer_under_io(struct extent_buffer *eb);
324int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
325 unsigned long min_len, char **map,
326 unsigned long *map_start,
327 unsigned long *map_len);
328int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
329int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
330int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
331 struct page *locked_page,
332 unsigned long bits_to_clear,
333 unsigned long page_ops);
334struct bio *
335btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
336 gfp_t gfp_flags);
337struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
338struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask);
339
340struct btrfs_fs_info;
341
342int repair_io_failure(struct btrfs_fs_info *fs_info, u64 start,
343 u64 length, u64 logical, struct page *page,
344 int mirror_num);
345int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
346int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
347 int mirror_num);
348#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
349noinline u64 find_lock_delalloc_range(struct inode *inode,
350 struct extent_io_tree *tree,
351 struct page *locked_page, u64 *start,
352 u64 *end, u64 max_bytes);
353#endif
354#endif