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_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
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
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,
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,
84 void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
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 {
97 struct radix_tree_root buffer;
98 struct address_space *mapping;
101 spinlock_t buffer_lock;
102 struct extent_io_ops *ops;
105 struct extent_state {
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;
116 /* for use by the FS */
119 struct list_head leak_list;
122 #define INLINE_EXTENT_BUFFER_PAGES 16
123 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
124 struct extent_buffer {
127 unsigned long map_start;
128 unsigned long map_len;
129 unsigned long bflags;
131 atomic_t pages_reading;
132 struct list_head leak_list;
133 struct rcu_head rcu_head;
136 /* count of read lock holders on the extent buffer */
137 atomic_t write_locks;
139 atomic_t blocking_writers;
140 atomic_t blocking_readers;
141 atomic_t spinning_readers;
142 atomic_t spinning_writers;
145 /* protects write locks */
148 /* readers use lock_wq while they wait for the write
149 * lock holders to unlock
151 wait_queue_head_t write_lock_wq;
153 /* writers use read_lock_wq while they wait for readers
156 wait_queue_head_t read_lock_wq;
157 wait_queue_head_t lock_wq;
158 struct page *inline_pages[INLINE_EXTENT_BUFFER_PAGES];
162 static inline void extent_set_compress_type(unsigned long *bio_flags,
165 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
168 static inline int extent_compress_type(unsigned long bio_flags)
170 return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
173 struct extent_map_tree;
175 typedef struct extent_map *(get_extent_t)(struct inode *inode,
181 void extent_io_tree_init(struct extent_io_tree *tree,
182 struct address_space *mapping);
183 int try_release_extent_mapping(struct extent_map_tree *map,
184 struct extent_io_tree *tree, struct page *page,
186 int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
187 int try_release_extent_state(struct extent_map_tree *map,
188 struct extent_io_tree *tree, struct page *page,
190 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
191 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
192 int bits, struct extent_state **cached, gfp_t mask);
193 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
194 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
195 struct extent_state **cached, gfp_t mask);
196 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
198 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
199 get_extent_t *get_extent, int mirror_num);
200 int __init extent_io_init(void);
201 void extent_io_exit(void);
203 u64 count_range_bits(struct extent_io_tree *tree,
204 u64 *start, u64 search_end,
205 u64 max_bytes, unsigned long bits, int contig);
207 void free_extent_state(struct extent_state *state);
208 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
209 int bits, int filled, struct extent_state *cached_state);
210 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
211 int bits, gfp_t mask);
212 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
213 int bits, int wake, int delete, struct extent_state **cached,
215 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
216 int bits, gfp_t mask);
217 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
218 int bits, int exclusive_bits, u64 *failed_start,
219 struct extent_state **cached_state, gfp_t mask);
220 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
221 struct extent_state **cached_state, gfp_t mask);
222 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
224 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
226 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
228 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
229 int bits, int clear_bits, gfp_t mask);
230 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
231 struct extent_state **cached_state, gfp_t mask);
232 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
233 u64 *start_ret, u64 *end_ret, int bits);
234 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
235 u64 start, int bits);
236 int extent_invalidatepage(struct extent_io_tree *tree,
237 struct page *page, unsigned long offset);
238 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
239 get_extent_t *get_extent,
240 struct writeback_control *wbc);
241 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
242 u64 start, u64 end, get_extent_t *get_extent,
244 int extent_writepages(struct extent_io_tree *tree,
245 struct address_space *mapping,
246 get_extent_t *get_extent,
247 struct writeback_control *wbc);
248 int extent_readpages(struct extent_io_tree *tree,
249 struct address_space *mapping,
250 struct list_head *pages, unsigned nr_pages,
251 get_extent_t get_extent);
252 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
253 __u64 start, __u64 len, get_extent_t *get_extent);
254 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
255 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
256 void set_page_extent_mapped(struct page *page);
258 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
259 u64 start, unsigned long len);
260 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
261 u64 start, unsigned long len);
262 void free_extent_buffer(struct extent_buffer *eb);
264 #define WAIT_COMPLETE 1
265 #define WAIT_PAGE_LOCK 2
266 int read_extent_buffer_pages(struct extent_io_tree *tree,
267 struct extent_buffer *eb, u64 start, int wait,
268 get_extent_t *get_extent, int mirror_num);
269 unsigned long num_extent_pages(u64 start, u64 len);
270 struct page *extent_buffer_page(struct extent_buffer *eb, unsigned long i);
272 static inline void extent_buffer_get(struct extent_buffer *eb)
274 atomic_inc(&eb->refs);
277 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
280 void read_extent_buffer(struct extent_buffer *eb, void *dst,
283 void write_extent_buffer(struct extent_buffer *eb, const void *src,
284 unsigned long start, unsigned long len);
285 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
286 unsigned long dst_offset, unsigned long src_offset,
288 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
289 unsigned long src_offset, unsigned long len);
290 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
291 unsigned long src_offset, unsigned long len);
292 void memset_extent_buffer(struct extent_buffer *eb, char c,
293 unsigned long start, unsigned long len);
294 int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
295 int clear_extent_buffer_dirty(struct extent_io_tree *tree,
296 struct extent_buffer *eb);
297 int set_extent_buffer_dirty(struct extent_io_tree *tree,
298 struct extent_buffer *eb);
299 int set_extent_buffer_uptodate(struct extent_io_tree *tree,
300 struct extent_buffer *eb);
301 int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
302 struct extent_buffer *eb,
303 struct extent_state **cached_state);
304 int extent_buffer_uptodate(struct extent_io_tree *tree,
305 struct extent_buffer *eb,
306 struct extent_state *cached_state);
307 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
308 unsigned long min_len, char **map,
309 unsigned long *map_start,
310 unsigned long *map_len);
311 int extent_range_uptodate(struct extent_io_tree *tree,
313 int extent_clear_unlock_delalloc(struct inode *inode,
314 struct extent_io_tree *tree,
315 u64 start, u64 end, struct page *locked_page,
318 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
321 struct btrfs_mapping_tree;
323 int repair_io_failure(struct btrfs_mapping_tree *map_tree, u64 start,
324 u64 length, u64 logical, struct page *page,
326 int end_extent_writepage(struct page *page, int err, u64 start, u64 end);