Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux
[linux-2.6.git] / fs / btrfs / extent_io.h
blob3b8c4e26e1da08f69e081a75a518d452b221bbf4
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_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)
27 * flags for bio submission. The high bits indicate the compression
28 * type for this bio
30 #define EXTENT_BIO_COMPRESSED 1
31 #define EXTENT_BIO_TREE_LOG 2
32 #define EXTENT_BIO_FLAG_SHIFT 16
34 /* these are bit numbers for test/set bit */
35 #define EXTENT_BUFFER_UPTODATE 0
36 #define EXTENT_BUFFER_BLOCKING 1
37 #define EXTENT_BUFFER_DIRTY 2
38 #define EXTENT_BUFFER_CORRUPT 3
39 #define EXTENT_BUFFER_READAHEAD 4 /* this got triggered by readahead */
40 #define EXTENT_BUFFER_TREE_REF 5
41 #define EXTENT_BUFFER_STALE 6
42 #define EXTENT_BUFFER_WRITEBACK 7
43 #define EXTENT_BUFFER_IOERR 8
44 #define EXTENT_BUFFER_DUMMY 9
46 /* these are flags for extent_clear_unlock_delalloc */
47 #define EXTENT_CLEAR_UNLOCK_PAGE 0x1
48 #define EXTENT_CLEAR_UNLOCK 0x2
49 #define EXTENT_CLEAR_DELALLOC 0x4
50 #define EXTENT_CLEAR_DIRTY 0x8
51 #define EXTENT_SET_WRITEBACK 0x10
52 #define EXTENT_END_WRITEBACK 0x20
53 #define EXTENT_SET_PRIVATE2 0x40
54 #define EXTENT_CLEAR_ACCOUNTING 0x80
57 * page->private values. Every page that is controlled by the extent
58 * map has page->private set to one.
60 #define EXTENT_PAGE_PRIVATE 1
61 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
63 struct extent_state;
64 struct btrfs_root;
66 typedef 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);
69 struct 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 page *page, u64 start, u64 end,
81 struct extent_state *state, int mirror);
82 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
83 struct extent_state *state, int uptodate);
84 void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
85 unsigned long *bits);
86 void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
87 unsigned long *bits);
88 void (*merge_extent_hook)(struct inode *inode,
89 struct extent_state *new,
90 struct extent_state *other);
91 void (*split_extent_hook)(struct inode *inode,
92 struct extent_state *orig, u64 split);
95 struct extent_io_tree {
96 struct rb_root state;
97 struct radix_tree_root buffer;
98 struct address_space *mapping;
99 u64 dirty_bytes;
100 int track_uptodate;
101 spinlock_t lock;
102 spinlock_t buffer_lock;
103 struct extent_io_ops *ops;
106 struct extent_state {
107 u64 start;
108 u64 end; /* inclusive */
109 struct rb_node rb_node;
111 /* ADD NEW ELEMENTS AFTER THIS */
112 struct extent_io_tree *tree;
113 wait_queue_head_t wq;
114 atomic_t refs;
115 unsigned long state;
117 /* for use by the FS */
118 u64 private;
120 #ifdef CONFIG_BTRFS_DEBUG
121 struct list_head leak_list;
122 #endif
125 #define INLINE_EXTENT_BUFFER_PAGES 16
126 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
127 struct extent_buffer {
128 u64 start;
129 unsigned long len;
130 unsigned long map_start;
131 unsigned long map_len;
132 unsigned long bflags;
133 struct extent_io_tree *tree;
134 spinlock_t refs_lock;
135 atomic_t refs;
136 atomic_t io_pages;
137 int read_mirror;
138 struct rcu_head rcu_head;
139 pid_t lock_owner;
141 /* count of read lock holders on the extent buffer */
142 atomic_t write_locks;
143 atomic_t read_locks;
144 atomic_t blocking_writers;
145 atomic_t blocking_readers;
146 atomic_t spinning_readers;
147 atomic_t spinning_writers;
148 int lock_nested;
150 /* protects write locks */
151 rwlock_t lock;
153 /* readers use lock_wq while they wait for the write
154 * lock holders to unlock
156 wait_queue_head_t write_lock_wq;
158 /* writers use read_lock_wq while they wait for readers
159 * to unlock
161 wait_queue_head_t read_lock_wq;
162 wait_queue_head_t lock_wq;
163 struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
164 #ifdef CONFIG_BTRFS_DEBUG
165 struct list_head leak_list;
166 #endif
169 static inline void extent_set_compress_type(unsigned long *bio_flags,
170 int compress_type)
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,
183 struct page *page,
184 size_t pg_offset,
185 u64 start, u64 len,
186 int create);
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,
192 gfp_t mask);
193 int try_release_extent_buffer(struct page *page);
194 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
195 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
196 unsigned long bits, struct extent_state **cached);
197 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
198 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
199 struct extent_state **cached, gfp_t mask);
200 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
201 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
202 get_extent_t *get_extent, int mirror_num);
203 int __init extent_io_init(void);
204 void extent_io_exit(void);
206 u64 count_range_bits(struct extent_io_tree *tree,
207 u64 *start, u64 search_end,
208 u64 max_bytes, unsigned long bits, int contig);
210 void free_extent_state(struct extent_state *state);
211 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
212 unsigned long bits, int filled,
213 struct extent_state *cached_state);
214 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
215 unsigned long bits, gfp_t mask);
216 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
217 unsigned long bits, int wake, int delete,
218 struct extent_state **cached, gfp_t mask);
219 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
220 unsigned long bits, gfp_t mask);
221 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
222 unsigned long bits, u64 *failed_start,
223 struct extent_state **cached_state, gfp_t mask);
224 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
225 struct extent_state **cached_state, gfp_t mask);
226 int clear_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,
229 gfp_t mask);
230 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
231 gfp_t mask);
232 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
233 gfp_t mask);
234 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
235 unsigned long bits, unsigned long clear_bits,
236 struct extent_state **cached_state, gfp_t mask);
237 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
238 struct extent_state **cached_state, gfp_t mask);
239 int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end,
240 struct extent_state **cached_state, gfp_t mask);
241 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
242 u64 *start_ret, u64 *end_ret, unsigned long bits,
243 struct extent_state **cached_state);
244 int extent_invalidatepage(struct extent_io_tree *tree,
245 struct page *page, unsigned long offset);
246 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
247 get_extent_t *get_extent,
248 struct writeback_control *wbc);
249 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
250 u64 start, u64 end, get_extent_t *get_extent,
251 int mode);
252 int extent_writepages(struct extent_io_tree *tree,
253 struct address_space *mapping,
254 get_extent_t *get_extent,
255 struct writeback_control *wbc);
256 int btree_write_cache_pages(struct address_space *mapping,
257 struct writeback_control *wbc);
258 int extent_readpages(struct extent_io_tree *tree,
259 struct address_space *mapping,
260 struct list_head *pages, unsigned nr_pages,
261 get_extent_t get_extent);
262 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
263 __u64 start, __u64 len, get_extent_t *get_extent);
264 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
265 void extent_cache_csums_dio(struct extent_io_tree *tree, u64 start, u32 csums[],
266 int count);
267 void extent_cache_csums(struct extent_io_tree *tree, struct bio *bio,
268 int bvec_index, u32 csums[], int count);
269 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
270 void set_page_extent_mapped(struct page *page);
272 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
273 u64 start, unsigned long len);
274 struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len);
275 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
276 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
277 u64 start, unsigned long len);
278 void free_extent_buffer(struct extent_buffer *eb);
279 void free_extent_buffer_stale(struct extent_buffer *eb);
280 #define WAIT_NONE 0
281 #define WAIT_COMPLETE 1
282 #define WAIT_PAGE_LOCK 2
283 int read_extent_buffer_pages(struct extent_io_tree *tree,
284 struct extent_buffer *eb, u64 start, int wait,
285 get_extent_t *get_extent, int mirror_num);
286 void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
288 static inline unsigned long num_extent_pages(u64 start, u64 len)
290 return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
291 (start >> PAGE_CACHE_SHIFT);
294 static inline struct page *extent_buffer_page(struct extent_buffer *eb,
295 unsigned long i)
297 return eb->pages[i];
300 static inline void extent_buffer_get(struct extent_buffer *eb)
302 atomic_inc(&eb->refs);
305 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
306 unsigned long start,
307 unsigned long len);
308 void read_extent_buffer(struct extent_buffer *eb, void *dst,
309 unsigned long start,
310 unsigned long len);
311 void write_extent_buffer(struct extent_buffer *eb, const void *src,
312 unsigned long start, unsigned long len);
313 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
314 unsigned long dst_offset, unsigned long src_offset,
315 unsigned long len);
316 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
317 unsigned long src_offset, unsigned long len);
318 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
319 unsigned long src_offset, unsigned long len);
320 void memset_extent_buffer(struct extent_buffer *eb, char c,
321 unsigned long start, unsigned long len);
322 void clear_extent_buffer_dirty(struct extent_buffer *eb);
323 int set_extent_buffer_dirty(struct extent_buffer *eb);
324 int set_extent_buffer_uptodate(struct extent_buffer *eb);
325 int clear_extent_buffer_uptodate(struct extent_buffer *eb);
326 int extent_buffer_uptodate(struct extent_buffer *eb);
327 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
328 unsigned long min_len, char **map,
329 unsigned long *map_start,
330 unsigned long *map_len);
331 int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
332 int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
333 int extent_clear_unlock_delalloc(struct inode *inode,
334 struct extent_io_tree *tree,
335 u64 start, u64 end, struct page *locked_page,
336 unsigned long op);
337 struct bio *
338 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
339 gfp_t gfp_flags);
340 struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
341 struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask);
343 struct btrfs_fs_info;
345 int repair_io_failure(struct btrfs_fs_info *fs_info, u64 start,
346 u64 length, u64 logical, struct page *page,
347 int mirror_num);
348 int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
349 int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
350 int mirror_num);
351 #endif