mach-ux500: no MMC_CAP_SD_HIGHSPEED on Snowball
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / btrfs / extent_io.h
blob7604c30013227fd823b1523503f8faaeccf283c4
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_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
23 #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
26 * flags for bio submission. The high bits indicate the compression
27 * type for this bio
29 #define EXTENT_BIO_COMPRESSED 1
30 #define EXTENT_BIO_FLAG_SHIFT 16
32 /* these are bit numbers for test/set bit */
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 /* this got triggered by readahead */
39 /* these are flags for extent_clear_unlock_delalloc */
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
50 * page->private values. Every page that is controlled by the extent
51 * map has page->private set to one.
53 #define EXTENT_PAGE_PRIVATE 1
54 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
56 struct extent_state;
58 typedef 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);
61 struct 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 *));
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 spinlock_t lock;
101 spinlock_t buffer_lock;
102 struct extent_io_ops *ops;
105 struct extent_state {
106 u64 start;
107 u64 end; /* inclusive */
108 struct rb_node rb_node;
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;
116 /* for use by the FS */
117 u64 private;
119 struct list_head leak_list;
122 struct 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;
133 /* count of read lock holders on the extent buffer */
134 atomic_t write_locks;
135 atomic_t read_locks;
136 atomic_t blocking_writers;
137 atomic_t blocking_readers;
138 atomic_t spinning_readers;
139 atomic_t spinning_writers;
141 /* protects write locks */
142 rwlock_t lock;
144 /* readers use lock_wq while they wait for the write
145 * lock holders to unlock
147 wait_queue_head_t write_lock_wq;
149 /* writers use read_lock_wq while they wait for readers
150 * to unlock
152 wait_queue_head_t read_lock_wq;
155 static inline void extent_set_compress_type(unsigned long *bio_flags,
156 int compress_type)
158 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
161 static inline int extent_compress_type(unsigned long bio_flags)
163 return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
166 struct extent_map_tree;
168 typedef struct extent_map *(get_extent_t)(struct inode *inode,
169 struct page *page,
170 size_t pg_offset,
171 u64 start, u64 len,
172 int create);
174 void extent_io_tree_init(struct extent_io_tree *tree,
175 struct address_space *mapping);
176 int try_release_extent_mapping(struct extent_map_tree *map,
177 struct extent_io_tree *tree, struct page *page,
178 gfp_t mask);
179 int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
180 int try_release_extent_state(struct extent_map_tree *map,
181 struct extent_io_tree *tree, struct page *page,
182 gfp_t mask);
183 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
184 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
185 int bits, struct extent_state **cached, gfp_t mask);
186 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
187 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
188 struct extent_state **cached, gfp_t mask);
189 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
190 gfp_t mask);
191 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
192 get_extent_t *get_extent, int mirror_num);
193 int __init extent_io_init(void);
194 void extent_io_exit(void);
196 u64 count_range_bits(struct extent_io_tree *tree,
197 u64 *start, u64 search_end,
198 u64 max_bytes, unsigned long bits, int contig);
200 void free_extent_state(struct extent_state *state);
201 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
202 int bits, int filled, struct extent_state *cached_state);
203 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
204 int bits, gfp_t mask);
205 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
206 int bits, int wake, int delete, struct extent_state **cached,
207 gfp_t mask);
208 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
209 int bits, gfp_t mask);
210 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
211 int bits, int exclusive_bits, u64 *failed_start,
212 struct extent_state **cached_state, gfp_t mask);
213 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
214 struct extent_state **cached_state, gfp_t mask);
215 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
216 gfp_t mask);
217 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
218 gfp_t mask);
219 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
220 gfp_t mask);
221 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
222 int bits, int clear_bits, gfp_t mask);
223 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
224 struct extent_state **cached_state, gfp_t mask);
225 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
226 u64 *start_ret, u64 *end_ret, int bits);
227 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
228 u64 start, int bits);
229 int extent_invalidatepage(struct extent_io_tree *tree,
230 struct page *page, unsigned long offset);
231 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
232 get_extent_t *get_extent,
233 struct writeback_control *wbc);
234 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
235 u64 start, u64 end, get_extent_t *get_extent,
236 int mode);
237 int extent_writepages(struct extent_io_tree *tree,
238 struct address_space *mapping,
239 get_extent_t *get_extent,
240 struct writeback_control *wbc);
241 int extent_readpages(struct extent_io_tree *tree,
242 struct address_space *mapping,
243 struct list_head *pages, unsigned nr_pages,
244 get_extent_t get_extent);
245 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
246 __u64 start, __u64 len, get_extent_t *get_extent);
247 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
248 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
249 void set_page_extent_mapped(struct page *page);
251 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
252 u64 start, unsigned long len,
253 struct page *page0);
254 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
255 u64 start, unsigned long len);
256 void free_extent_buffer(struct extent_buffer *eb);
257 #define WAIT_NONE 0
258 #define WAIT_COMPLETE 1
259 #define WAIT_PAGE_LOCK 2
260 int read_extent_buffer_pages(struct extent_io_tree *tree,
261 struct extent_buffer *eb, u64 start, int wait,
262 get_extent_t *get_extent, int mirror_num);
263 unsigned long num_extent_pages(u64 start, u64 len);
264 struct page *extent_buffer_page(struct extent_buffer *eb, unsigned long i);
266 static inline void extent_buffer_get(struct extent_buffer *eb)
268 atomic_inc(&eb->refs);
271 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
272 unsigned long start,
273 unsigned long len);
274 void read_extent_buffer(struct extent_buffer *eb, void *dst,
275 unsigned long start,
276 unsigned long len);
277 void write_extent_buffer(struct extent_buffer *eb, const void *src,
278 unsigned long start, unsigned long len);
279 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
280 unsigned long dst_offset, unsigned long src_offset,
281 unsigned long len);
282 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
283 unsigned long src_offset, unsigned long len);
284 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
285 unsigned long src_offset, unsigned long len);
286 void memset_extent_buffer(struct extent_buffer *eb, char c,
287 unsigned long start, unsigned long len);
288 int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
289 int clear_extent_buffer_dirty(struct extent_io_tree *tree,
290 struct extent_buffer *eb);
291 int set_extent_buffer_dirty(struct extent_io_tree *tree,
292 struct extent_buffer *eb);
293 int set_extent_buffer_uptodate(struct extent_io_tree *tree,
294 struct extent_buffer *eb);
295 int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
296 struct extent_buffer *eb,
297 struct extent_state **cached_state);
298 int extent_buffer_uptodate(struct extent_io_tree *tree,
299 struct extent_buffer *eb,
300 struct extent_state *cached_state);
301 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
302 unsigned long min_len, char **map,
303 unsigned long *map_start,
304 unsigned long *map_len);
305 int extent_range_uptodate(struct extent_io_tree *tree,
306 u64 start, u64 end);
307 int extent_clear_unlock_delalloc(struct inode *inode,
308 struct extent_io_tree *tree,
309 u64 start, u64 end, struct page *locked_page,
310 unsigned long op);
311 struct bio *
312 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
313 gfp_t gfp_flags);
315 struct btrfs_mapping_tree;
317 int repair_io_failure(struct btrfs_mapping_tree *map_tree, u64 start,
318 u64 length, u64 logical, struct page *page,
319 int mirror_num);
320 #endif