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 struct extent_buffer {
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;
134 /* count of read lock holders on the extent buffer */
135 atomic_t write_locks;
137 atomic_t blocking_writers;
138 atomic_t blocking_readers;
139 atomic_t spinning_readers;
140 atomic_t spinning_writers;
143 /* protects write locks */
146 /* readers use lock_wq while they wait for the write
147 * lock holders to unlock
149 wait_queue_head_t write_lock_wq;
151 /* writers use read_lock_wq while they wait for readers
154 wait_queue_head_t read_lock_wq;
157 static inline void extent_set_compress_type(unsigned long *bio_flags,
160 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
163 static inline int extent_compress_type(unsigned long bio_flags)
165 return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
168 struct extent_map_tree;
170 typedef struct extent_map *(get_extent_t)(struct inode *inode,
176 void extent_io_tree_init(struct extent_io_tree *tree,
177 struct address_space *mapping);
178 int try_release_extent_mapping(struct extent_map_tree *map,
179 struct extent_io_tree *tree, struct page *page,
181 int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
182 int try_release_extent_state(struct extent_map_tree *map,
183 struct extent_io_tree *tree, struct page *page,
185 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
186 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
187 int bits, struct extent_state **cached, gfp_t mask);
188 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
189 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
190 struct extent_state **cached, gfp_t mask);
191 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
193 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
194 get_extent_t *get_extent, int mirror_num);
195 int __init extent_io_init(void);
196 void extent_io_exit(void);
198 u64 count_range_bits(struct extent_io_tree *tree,
199 u64 *start, u64 search_end,
200 u64 max_bytes, unsigned long bits, int contig);
202 void free_extent_state(struct extent_state *state);
203 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
204 int bits, int filled, struct extent_state *cached_state);
205 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
206 int bits, gfp_t mask);
207 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
208 int bits, int wake, int delete, struct extent_state **cached,
210 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
211 int bits, gfp_t mask);
212 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
213 int bits, int exclusive_bits, u64 *failed_start,
214 struct extent_state **cached_state, gfp_t mask);
215 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
216 struct extent_state **cached_state, gfp_t mask);
217 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
219 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
221 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
223 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
224 int bits, int clear_bits, gfp_t mask);
225 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
226 struct extent_state **cached_state, gfp_t mask);
227 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
228 u64 *start_ret, u64 *end_ret, int bits);
229 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
230 u64 start, int bits);
231 int extent_invalidatepage(struct extent_io_tree *tree,
232 struct page *page, unsigned long offset);
233 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
234 get_extent_t *get_extent,
235 struct writeback_control *wbc);
236 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
237 u64 start, u64 end, get_extent_t *get_extent,
239 int extent_writepages(struct extent_io_tree *tree,
240 struct address_space *mapping,
241 get_extent_t *get_extent,
242 struct writeback_control *wbc);
243 int extent_readpages(struct extent_io_tree *tree,
244 struct address_space *mapping,
245 struct list_head *pages, unsigned nr_pages,
246 get_extent_t get_extent);
247 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
248 __u64 start, __u64 len, get_extent_t *get_extent);
249 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
250 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
251 void set_page_extent_mapped(struct page *page);
253 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
254 u64 start, unsigned long len,
256 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
257 u64 start, unsigned long len);
258 void free_extent_buffer(struct extent_buffer *eb);
260 #define WAIT_COMPLETE 1
261 #define WAIT_PAGE_LOCK 2
262 int read_extent_buffer_pages(struct extent_io_tree *tree,
263 struct extent_buffer *eb, u64 start, int wait,
264 get_extent_t *get_extent, int mirror_num);
265 unsigned long num_extent_pages(u64 start, u64 len);
266 struct page *extent_buffer_page(struct extent_buffer *eb, unsigned long i);
268 static inline void extent_buffer_get(struct extent_buffer *eb)
270 atomic_inc(&eb->refs);
273 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
276 void read_extent_buffer(struct extent_buffer *eb, void *dst,
279 void write_extent_buffer(struct extent_buffer *eb, const void *src,
280 unsigned long start, unsigned long len);
281 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
282 unsigned long dst_offset, unsigned long src_offset,
284 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
285 unsigned long src_offset, unsigned long len);
286 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
287 unsigned long src_offset, unsigned long len);
288 void memset_extent_buffer(struct extent_buffer *eb, char c,
289 unsigned long start, unsigned long len);
290 int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
291 int clear_extent_buffer_dirty(struct extent_io_tree *tree,
292 struct extent_buffer *eb);
293 int set_extent_buffer_dirty(struct extent_io_tree *tree,
294 struct extent_buffer *eb);
295 int set_extent_buffer_uptodate(struct extent_io_tree *tree,
296 struct extent_buffer *eb);
297 int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
298 struct extent_buffer *eb,
299 struct extent_state **cached_state);
300 int extent_buffer_uptodate(struct extent_io_tree *tree,
301 struct extent_buffer *eb,
302 struct extent_state *cached_state);
303 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
304 unsigned long min_len, char **map,
305 unsigned long *map_start,
306 unsigned long *map_len);
307 int extent_range_uptodate(struct extent_io_tree *tree,
309 int extent_clear_unlock_delalloc(struct inode *inode,
310 struct extent_io_tree *tree,
311 u64 start, u64 end, struct page *locked_page,
314 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
317 struct btrfs_mapping_tree;
319 int repair_io_failure(struct btrfs_mapping_tree *map_tree, u64 start,
320 u64 length, u64 logical, struct page *page,