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
);
186 int lock_extent_bits(struct extent_io_tree
*tree
, u64 start
, u64 end
,
187 int bits
, struct extent_state
**cached
);
188 int unlock_extent(struct extent_io_tree
*tree
, u64 start
, u64 end
);
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
);
192 int extent_read_full_page(struct extent_io_tree
*tree
, struct page
*page
,
193 get_extent_t
*get_extent
, int mirror_num
);
194 int __init
extent_io_init(void);
195 void extent_io_exit(void);
197 u64
count_range_bits(struct extent_io_tree
*tree
,
198 u64
*start
, u64 search_end
,
199 u64 max_bytes
, unsigned long bits
, int contig
);
201 void free_extent_state(struct extent_state
*state
);
202 int test_range_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
203 int bits
, int filled
, struct extent_state
*cached_state
);
204 int clear_extent_bits(struct extent_io_tree
*tree
, u64 start
, u64 end
,
205 int bits
, gfp_t mask
);
206 int clear_extent_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
207 int bits
, int wake
, int delete, struct extent_state
**cached
,
209 int set_extent_bits(struct extent_io_tree
*tree
, u64 start
, u64 end
,
210 int bits
, gfp_t mask
);
211 int set_extent_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
212 int bits
, u64
*failed_start
,
213 struct extent_state
**cached_state
, gfp_t mask
);
214 int set_extent_uptodate(struct extent_io_tree
*tree
, u64 start
, u64 end
,
215 struct extent_state
**cached_state
, gfp_t mask
);
216 int set_extent_new(struct extent_io_tree
*tree
, u64 start
, u64 end
,
218 int set_extent_dirty(struct extent_io_tree
*tree
, u64 start
, u64 end
,
220 int clear_extent_dirty(struct extent_io_tree
*tree
, u64 start
, u64 end
,
222 int convert_extent_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
223 int bits
, int clear_bits
, gfp_t mask
);
224 int set_extent_delalloc(struct extent_io_tree
*tree
, u64 start
, u64 end
,
225 struct extent_state
**cached_state
, gfp_t mask
);
226 int find_first_extent_bit(struct extent_io_tree
*tree
, u64 start
,
227 u64
*start_ret
, u64
*end_ret
, int bits
);
228 struct extent_state
*find_first_extent_bit_state(struct extent_io_tree
*tree
,
229 u64 start
, int bits
);
230 int extent_invalidatepage(struct extent_io_tree
*tree
,
231 struct page
*page
, unsigned long offset
);
232 int extent_write_full_page(struct extent_io_tree
*tree
, struct page
*page
,
233 get_extent_t
*get_extent
,
234 struct writeback_control
*wbc
);
235 int extent_write_locked_range(struct extent_io_tree
*tree
, struct inode
*inode
,
236 u64 start
, u64 end
, get_extent_t
*get_extent
,
238 int extent_writepages(struct extent_io_tree
*tree
,
239 struct address_space
*mapping
,
240 get_extent_t
*get_extent
,
241 struct writeback_control
*wbc
);
242 int extent_readpages(struct extent_io_tree
*tree
,
243 struct address_space
*mapping
,
244 struct list_head
*pages
, unsigned nr_pages
,
245 get_extent_t get_extent
);
246 int extent_fiemap(struct inode
*inode
, struct fiemap_extent_info
*fieinfo
,
247 __u64 start
, __u64 len
, get_extent_t
*get_extent
);
248 int set_state_private(struct extent_io_tree
*tree
, u64 start
, u64
private);
249 int get_state_private(struct extent_io_tree
*tree
, u64 start
, u64
*private);
250 void set_page_extent_mapped(struct page
*page
);
252 struct extent_buffer
*alloc_extent_buffer(struct extent_io_tree
*tree
,
253 u64 start
, unsigned long len
,
255 struct extent_buffer
*find_extent_buffer(struct extent_io_tree
*tree
,
256 u64 start
, unsigned long len
);
257 void free_extent_buffer(struct extent_buffer
*eb
);
259 #define WAIT_COMPLETE 1
260 #define WAIT_PAGE_LOCK 2
261 int read_extent_buffer_pages(struct extent_io_tree
*tree
,
262 struct extent_buffer
*eb
, u64 start
, int wait
,
263 get_extent_t
*get_extent
, int mirror_num
);
264 unsigned long num_extent_pages(u64 start
, u64 len
);
265 struct page
*extent_buffer_page(struct extent_buffer
*eb
, unsigned long i
);
267 static inline void extent_buffer_get(struct extent_buffer
*eb
)
269 atomic_inc(&eb
->refs
);
272 int memcmp_extent_buffer(struct extent_buffer
*eb
, const void *ptrv
,
275 void read_extent_buffer(struct extent_buffer
*eb
, void *dst
,
278 void write_extent_buffer(struct extent_buffer
*eb
, const void *src
,
279 unsigned long start
, unsigned long len
);
280 void copy_extent_buffer(struct extent_buffer
*dst
, struct extent_buffer
*src
,
281 unsigned long dst_offset
, unsigned long src_offset
,
283 void memcpy_extent_buffer(struct extent_buffer
*dst
, unsigned long dst_offset
,
284 unsigned long src_offset
, unsigned long len
);
285 void memmove_extent_buffer(struct extent_buffer
*dst
, unsigned long dst_offset
,
286 unsigned long src_offset
, unsigned long len
);
287 void memset_extent_buffer(struct extent_buffer
*eb
, char c
,
288 unsigned long start
, unsigned long len
);
289 void wait_extent_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
, int bits
);
290 void clear_extent_buffer_dirty(struct extent_io_tree
*tree
,
291 struct extent_buffer
*eb
);
292 int set_extent_buffer_dirty(struct extent_io_tree
*tree
,
293 struct extent_buffer
*eb
);
294 int set_extent_buffer_uptodate(struct extent_io_tree
*tree
,
295 struct extent_buffer
*eb
);
296 int clear_extent_buffer_uptodate(struct extent_io_tree
*tree
,
297 struct extent_buffer
*eb
,
298 struct extent_state
**cached_state
);
299 int extent_buffer_uptodate(struct extent_io_tree
*tree
,
300 struct extent_buffer
*eb
,
301 struct extent_state
*cached_state
);
302 int map_private_extent_buffer(struct extent_buffer
*eb
, unsigned long offset
,
303 unsigned long min_len
, char **map
,
304 unsigned long *map_start
,
305 unsigned long *map_len
);
306 int extent_range_uptodate(struct extent_io_tree
*tree
,
308 int extent_clear_unlock_delalloc(struct inode
*inode
,
309 struct extent_io_tree
*tree
,
310 u64 start
, u64 end
, struct page
*locked_page
,
313 btrfs_bio_alloc(struct block_device
*bdev
, u64 first_sector
, int nr_vecs
,
316 struct btrfs_mapping_tree
;
318 int repair_io_failure(struct btrfs_mapping_tree
*map_tree
, u64 start
,
319 u64 length
, u64 logical
, struct page
*page
,
321 int end_extent_writepage(struct page
*page
, int err
, u64 start
, u64 end
);