4 #include <linux/rbtree.h>
6 /* bits for the extent state */
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)
24 * flags for bio submission. The high bits indicate the compression
27 #define EXTENT_BIO_COMPRESSED 1
28 #define EXTENT_BIO_FLAG_SHIFT 16
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
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
47 * page->private values. Every page that is controlled by the extent
48 * map has page->private set to one.
50 #define EXTENT_PAGE_PRIVATE 1
51 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
55 typedef 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);
58 struct 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,
71 struct extent_state *state);
72 int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
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 int (*set_bit_hook)(struct inode *inode, struct extent_state *state,
81 int (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
83 int (*merge_extent_hook)(struct inode *inode,
84 struct extent_state *new,
85 struct extent_state *other);
86 int (*split_extent_hook)(struct inode *inode,
87 struct extent_state *orig, u64 split);
88 int (*write_cache_pages_lock_hook)(struct page *page);
91 struct extent_io_tree {
93 struct radix_tree_root buffer;
94 struct address_space *mapping;
97 spinlock_t buffer_lock;
98 struct extent_io_ops *ops;
101 struct extent_state {
103 u64 end; /* inclusive */
104 struct rb_node rb_node;
106 /* ADD NEW ELEMENTS AFTER THIS */
107 struct extent_io_tree *tree;
108 wait_queue_head_t wq;
114 /* for use by the FS */
117 struct list_head leak_list;
120 struct extent_buffer {
123 unsigned long map_start;
124 unsigned long map_len;
125 struct page *first_page;
126 unsigned long bflags;
127 struct list_head leak_list;
128 struct rcu_head rcu_head;
131 /* the spinlock is used to protect most operations */
135 * when we keep the lock held while blocking, waiters go onto
138 wait_queue_head_t lock_wq;
141 static inline void extent_set_compress_type(unsigned long *bio_flags,
144 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
147 static inline int extent_compress_type(unsigned long bio_flags)
149 return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
152 struct extent_map_tree;
154 typedef struct extent_map *(get_extent_t)(struct inode *inode,
160 void extent_io_tree_init(struct extent_io_tree *tree,
161 struct address_space *mapping);
162 int try_release_extent_mapping(struct extent_map_tree *map,
163 struct extent_io_tree *tree, struct page *page,
165 int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
166 int try_release_extent_state(struct extent_map_tree *map,
167 struct extent_io_tree *tree, struct page *page,
169 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
170 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
171 int bits, struct extent_state **cached, gfp_t mask);
172 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
173 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
174 struct extent_state **cached, gfp_t mask);
175 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
177 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
178 get_extent_t *get_extent);
179 int __init extent_io_init(void);
180 void extent_io_exit(void);
182 u64 count_range_bits(struct extent_io_tree *tree,
183 u64 *start, u64 search_end,
184 u64 max_bytes, unsigned long bits, int contig);
186 void free_extent_state(struct extent_state *state);
187 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
188 int bits, int filled, struct extent_state *cached_state);
189 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
190 int bits, gfp_t mask);
191 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
192 int bits, int wake, int delete, struct extent_state **cached,
194 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
195 int bits, gfp_t mask);
196 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
197 int bits, int exclusive_bits, u64 *failed_start,
198 struct extent_state **cached_state, gfp_t mask);
199 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
200 struct extent_state **cached_state, gfp_t mask);
201 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
203 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
205 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
207 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
208 struct extent_state **cached_state, gfp_t mask);
209 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
210 u64 *start_ret, u64 *end_ret, int bits);
211 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
212 u64 start, int bits);
213 int extent_invalidatepage(struct extent_io_tree *tree,
214 struct page *page, unsigned long offset);
215 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
216 get_extent_t *get_extent,
217 struct writeback_control *wbc);
218 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
219 u64 start, u64 end, get_extent_t *get_extent,
221 int extent_writepages(struct extent_io_tree *tree,
222 struct address_space *mapping,
223 get_extent_t *get_extent,
224 struct writeback_control *wbc);
225 int extent_readpages(struct extent_io_tree *tree,
226 struct address_space *mapping,
227 struct list_head *pages, unsigned nr_pages,
228 get_extent_t get_extent);
229 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
230 __u64 start, __u64 len, get_extent_t *get_extent);
231 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
232 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
233 void set_page_extent_mapped(struct page *page);
235 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
236 u64 start, unsigned long len,
238 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
239 u64 start, unsigned long len);
240 void free_extent_buffer(struct extent_buffer *eb);
241 int read_extent_buffer_pages(struct extent_io_tree *tree,
242 struct extent_buffer *eb, u64 start, int wait,
243 get_extent_t *get_extent, int mirror_num);
245 static inline void extent_buffer_get(struct extent_buffer *eb)
247 atomic_inc(&eb->refs);
250 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
253 void read_extent_buffer(struct extent_buffer *eb, void *dst,
256 void write_extent_buffer(struct extent_buffer *eb, const void *src,
257 unsigned long start, unsigned long len);
258 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
259 unsigned long dst_offset, unsigned long src_offset,
261 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
262 unsigned long src_offset, unsigned long len);
263 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
264 unsigned long src_offset, unsigned long len);
265 void memset_extent_buffer(struct extent_buffer *eb, char c,
266 unsigned long start, unsigned long len);
267 int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
268 int clear_extent_buffer_dirty(struct extent_io_tree *tree,
269 struct extent_buffer *eb);
270 int set_extent_buffer_dirty(struct extent_io_tree *tree,
271 struct extent_buffer *eb);
272 int set_extent_buffer_uptodate(struct extent_io_tree *tree,
273 struct extent_buffer *eb);
274 int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
275 struct extent_buffer *eb,
276 struct extent_state **cached_state);
277 int extent_buffer_uptodate(struct extent_io_tree *tree,
278 struct extent_buffer *eb,
279 struct extent_state *cached_state);
280 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
281 unsigned long min_len, char **map,
282 unsigned long *map_start,
283 unsigned long *map_len);
284 int extent_range_uptodate(struct extent_io_tree *tree,
286 int extent_clear_unlock_delalloc(struct inode *inode,
287 struct extent_io_tree *tree,
288 u64 start, u64 end, struct page *locked_page,
291 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,