nilfs2: insert checkpoint number in segment summary header
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / btrfs / extent_io.h
blobbbab4813646f92a2df9c462daabde89b452826ab
1 #ifndef __EXTENTIO__
2 #define __EXTENTIO__
4 #include <linux/rbtree.h>
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_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
21 /* flags for bio submission */
22 #define EXTENT_BIO_COMPRESSED 1
24 /* these are bit numbers for test/set bit */
25 #define EXTENT_BUFFER_UPTODATE 0
26 #define EXTENT_BUFFER_BLOCKING 1
27 #define EXTENT_BUFFER_DIRTY 2
29 /* these are flags for extent_clear_unlock_delalloc */
30 #define EXTENT_CLEAR_UNLOCK_PAGE 0x1
31 #define EXTENT_CLEAR_UNLOCK 0x2
32 #define EXTENT_CLEAR_DELALLOC 0x4
33 #define EXTENT_CLEAR_DIRTY 0x8
34 #define EXTENT_SET_WRITEBACK 0x10
35 #define EXTENT_END_WRITEBACK 0x20
36 #define EXTENT_SET_PRIVATE2 0x40
37 #define EXTENT_CLEAR_ACCOUNTING 0x80
40 * page->private values. Every page that is controlled by the extent
41 * map has page->private set to one.
43 #define EXTENT_PAGE_PRIVATE 1
44 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
46 struct extent_state;
48 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
49 struct bio *bio, int mirror_num,
50 unsigned long bio_flags);
51 struct extent_io_ops {
52 int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
53 u64 start, u64 end, int *page_started,
54 unsigned long *nr_written);
55 int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
56 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
57 extent_submit_bio_hook_t *submit_bio_hook;
58 int (*merge_bio_hook)(struct page *page, unsigned long offset,
59 size_t size, struct bio *bio,
60 unsigned long bio_flags);
61 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
62 int (*readpage_io_failed_hook)(struct bio *bio, struct page *page,
63 u64 start, u64 end,
64 struct extent_state *state);
65 int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
66 u64 start, u64 end,
67 struct extent_state *state);
68 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
69 struct extent_state *state);
70 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
71 struct extent_state *state, int uptodate);
72 int (*set_bit_hook)(struct inode *inode, u64 start, u64 end,
73 unsigned long old, unsigned long bits);
74 int (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
75 unsigned long bits);
76 int (*merge_extent_hook)(struct inode *inode,
77 struct extent_state *new,
78 struct extent_state *other);
79 int (*split_extent_hook)(struct inode *inode,
80 struct extent_state *orig, u64 split);
81 int (*write_cache_pages_lock_hook)(struct page *page);
84 struct extent_io_tree {
85 struct rb_root state;
86 struct rb_root buffer;
87 struct address_space *mapping;
88 u64 dirty_bytes;
89 spinlock_t lock;
90 spinlock_t buffer_lock;
91 struct extent_io_ops *ops;
94 struct extent_state {
95 u64 start;
96 u64 end; /* inclusive */
97 struct rb_node rb_node;
99 /* ADD NEW ELEMENTS AFTER THIS */
100 struct extent_io_tree *tree;
101 wait_queue_head_t wq;
102 atomic_t refs;
103 unsigned long state;
104 u64 split_start;
105 u64 split_end;
107 /* for use by the FS */
108 u64 private;
110 struct list_head leak_list;
113 struct extent_buffer {
114 u64 start;
115 unsigned long len;
116 char *map_token;
117 char *kaddr;
118 unsigned long map_start;
119 unsigned long map_len;
120 struct page *first_page;
121 unsigned long bflags;
122 atomic_t refs;
123 struct list_head leak_list;
124 struct rb_node rb_node;
126 /* the spinlock is used to protect most operations */
127 spinlock_t lock;
130 * when we keep the lock held while blocking, waiters go onto
131 * the wq
133 wait_queue_head_t lock_wq;
136 struct extent_map_tree;
138 static inline struct extent_state *extent_state_next(struct extent_state *state)
140 struct rb_node *node;
141 node = rb_next(&state->rb_node);
142 if (!node)
143 return NULL;
144 return rb_entry(node, struct extent_state, rb_node);
147 typedef struct extent_map *(get_extent_t)(struct inode *inode,
148 struct page *page,
149 size_t page_offset,
150 u64 start, u64 len,
151 int create);
153 void extent_io_tree_init(struct extent_io_tree *tree,
154 struct address_space *mapping, gfp_t mask);
155 int try_release_extent_mapping(struct extent_map_tree *map,
156 struct extent_io_tree *tree, struct page *page,
157 gfp_t mask);
158 int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
159 int try_release_extent_state(struct extent_map_tree *map,
160 struct extent_io_tree *tree, struct page *page,
161 gfp_t mask);
162 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
163 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
164 int bits, struct extent_state **cached, gfp_t mask);
165 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
166 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
167 struct extent_state **cached, gfp_t mask);
168 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
169 gfp_t mask);
170 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
171 get_extent_t *get_extent);
172 int __init extent_io_init(void);
173 void extent_io_exit(void);
175 u64 count_range_bits(struct extent_io_tree *tree,
176 u64 *start, u64 search_end,
177 u64 max_bytes, unsigned long bits);
179 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
180 int bits, int filled, struct extent_state *cached_state);
181 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
182 int bits, gfp_t mask);
183 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
184 int bits, int wake, int delete, struct extent_state **cached,
185 gfp_t mask);
186 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
187 int bits, gfp_t mask);
188 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
189 gfp_t mask);
190 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
191 gfp_t mask);
192 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
193 gfp_t mask);
194 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
195 gfp_t mask);
196 int clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
197 gfp_t mask);
198 int clear_extent_ordered_metadata(struct extent_io_tree *tree, u64 start,
199 u64 end, gfp_t mask);
200 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
201 struct extent_state **cached_state, gfp_t mask);
202 int set_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
203 gfp_t mask);
204 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
205 u64 *start_ret, u64 *end_ret, int bits);
206 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
207 u64 start, int bits);
208 int extent_invalidatepage(struct extent_io_tree *tree,
209 struct page *page, unsigned long offset);
210 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
211 get_extent_t *get_extent,
212 struct writeback_control *wbc);
213 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
214 u64 start, u64 end, get_extent_t *get_extent,
215 int mode);
216 int extent_writepages(struct extent_io_tree *tree,
217 struct address_space *mapping,
218 get_extent_t *get_extent,
219 struct writeback_control *wbc);
220 int extent_readpages(struct extent_io_tree *tree,
221 struct address_space *mapping,
222 struct list_head *pages, unsigned nr_pages,
223 get_extent_t get_extent);
224 int extent_prepare_write(struct extent_io_tree *tree,
225 struct inode *inode, struct page *page,
226 unsigned from, unsigned to, get_extent_t *get_extent);
227 int extent_commit_write(struct extent_io_tree *tree,
228 struct inode *inode, struct page *page,
229 unsigned from, unsigned to);
230 sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
231 get_extent_t *get_extent);
232 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
233 __u64 start, __u64 len, get_extent_t *get_extent);
234 int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
235 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
236 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
237 void set_page_extent_mapped(struct page *page);
239 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
240 u64 start, unsigned long len,
241 struct page *page0,
242 gfp_t mask);
243 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
244 u64 start, unsigned long len,
245 gfp_t mask);
246 void free_extent_buffer(struct extent_buffer *eb);
247 int read_extent_buffer_pages(struct extent_io_tree *tree,
248 struct extent_buffer *eb, u64 start, int wait,
249 get_extent_t *get_extent, int mirror_num);
251 static inline void extent_buffer_get(struct extent_buffer *eb)
253 atomic_inc(&eb->refs);
256 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
257 unsigned long start,
258 unsigned long len);
259 void read_extent_buffer(struct extent_buffer *eb, void *dst,
260 unsigned long start,
261 unsigned long len);
262 void write_extent_buffer(struct extent_buffer *eb, const void *src,
263 unsigned long start, unsigned long len);
264 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
265 unsigned long dst_offset, unsigned long src_offset,
266 unsigned long len);
267 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
268 unsigned long src_offset, unsigned long len);
269 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
270 unsigned long src_offset, unsigned long len);
271 void memset_extent_buffer(struct extent_buffer *eb, char c,
272 unsigned long start, unsigned long len);
273 int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
274 struct extent_buffer *eb);
275 int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end);
276 int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
277 int clear_extent_buffer_dirty(struct extent_io_tree *tree,
278 struct extent_buffer *eb);
279 int set_extent_buffer_dirty(struct extent_io_tree *tree,
280 struct extent_buffer *eb);
281 int test_extent_buffer_dirty(struct extent_io_tree *tree,
282 struct extent_buffer *eb);
283 int set_extent_buffer_uptodate(struct extent_io_tree *tree,
284 struct extent_buffer *eb);
285 int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
286 struct extent_buffer *eb,
287 struct extent_state **cached_state);
288 int extent_buffer_uptodate(struct extent_io_tree *tree,
289 struct extent_buffer *eb,
290 struct extent_state *cached_state);
291 int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
292 unsigned long min_len, char **token, char **map,
293 unsigned long *map_start,
294 unsigned long *map_len, int km);
295 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
296 unsigned long min_len, char **token, char **map,
297 unsigned long *map_start,
298 unsigned long *map_len, int km);
299 void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
300 int release_extent_buffer_tail_pages(struct extent_buffer *eb);
301 int extent_range_uptodate(struct extent_io_tree *tree,
302 u64 start, u64 end);
303 int extent_clear_unlock_delalloc(struct inode *inode,
304 struct extent_io_tree *tree,
305 u64 start, u64 end, struct page *locked_page,
306 unsigned long op);
307 #endif