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