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_TREE_LOG 2
31 #define EXTENT_BIO_FLAG_SHIFT 16
33 /* these are bit numbers for test/set bit */
34 #define EXTENT_BUFFER_UPTODATE 0
35 #define EXTENT_BUFFER_BLOCKING 1
36 #define EXTENT_BUFFER_DIRTY 2
37 #define EXTENT_BUFFER_CORRUPT 3
38 #define EXTENT_BUFFER_READAHEAD 4 /* this got triggered by readahead */
39 #define EXTENT_BUFFER_TREE_REF 5
40 #define EXTENT_BUFFER_STALE 6
41 #define EXTENT_BUFFER_WRITEBACK 7
42 #define EXTENT_BUFFER_IOERR 8
43 #define EXTENT_BUFFER_DUMMY 9
45 /* these are flags for extent_clear_unlock_delalloc */
46 #define EXTENT_CLEAR_UNLOCK_PAGE 0x1
47 #define EXTENT_CLEAR_UNLOCK 0x2
48 #define EXTENT_CLEAR_DELALLOC 0x4
49 #define EXTENT_CLEAR_DIRTY 0x8
50 #define EXTENT_SET_WRITEBACK 0x10
51 #define EXTENT_END_WRITEBACK 0x20
52 #define EXTENT_SET_PRIVATE2 0x40
53 #define EXTENT_CLEAR_ACCOUNTING 0x80
56 * page->private values. Every page that is controlled by the extent
57 * map has page->private set to one.
59 #define EXTENT_PAGE_PRIVATE 1
60 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
65 typedef int (extent_submit_bio_hook_t
)(struct inode
*inode
, int rw
,
66 struct bio
*bio
, int mirror_num
,
67 unsigned long bio_flags
, u64 bio_offset
);
68 struct extent_io_ops
{
69 int (*fill_delalloc
)(struct inode
*inode
, struct page
*locked_page
,
70 u64 start
, u64 end
, int *page_started
,
71 unsigned long *nr_written
);
72 int (*writepage_start_hook
)(struct page
*page
, u64 start
, u64 end
);
73 int (*writepage_io_hook
)(struct page
*page
, u64 start
, u64 end
);
74 extent_submit_bio_hook_t
*submit_bio_hook
;
75 int (*merge_bio_hook
)(int rw
, struct page
*page
, unsigned long offset
,
76 size_t size
, struct bio
*bio
,
77 unsigned long bio_flags
);
78 int (*readpage_io_failed_hook
)(struct page
*page
, int failed_mirror
);
79 int (*readpage_end_io_hook
)(struct page
*page
, u64 start
, u64 end
,
80 struct extent_state
*state
, int mirror
);
81 int (*writepage_end_io_hook
)(struct page
*page
, u64 start
, u64 end
,
82 struct extent_state
*state
, int uptodate
);
83 void (*set_bit_hook
)(struct inode
*inode
, struct extent_state
*state
,
85 void (*clear_bit_hook
)(struct inode
*inode
, struct extent_state
*state
,
87 void (*merge_extent_hook
)(struct inode
*inode
,
88 struct extent_state
*new,
89 struct extent_state
*other
);
90 void (*split_extent_hook
)(struct inode
*inode
,
91 struct extent_state
*orig
, u64 split
);
94 struct extent_io_tree
{
96 struct radix_tree_root buffer
;
97 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
;
130 struct extent_io_tree
*tree
;
131 spinlock_t refs_lock
;
135 struct list_head leak_list
;
136 struct rcu_head rcu_head
;
139 /* count of read lock holders on the extent buffer */
140 atomic_t write_locks
;
142 atomic_t blocking_writers
;
143 atomic_t blocking_readers
;
144 atomic_t spinning_readers
;
145 atomic_t spinning_writers
;
148 /* protects write locks */
151 /* readers use lock_wq while they wait for the write
152 * lock holders to unlock
154 wait_queue_head_t write_lock_wq
;
156 /* writers use read_lock_wq while they wait for readers
159 wait_queue_head_t read_lock_wq
;
160 wait_queue_head_t lock_wq
;
161 struct page
*pages
[INLINE_EXTENT_BUFFER_PAGES
];
164 static inline void extent_set_compress_type(unsigned long *bio_flags
,
167 *bio_flags
|= compress_type
<< EXTENT_BIO_FLAG_SHIFT
;
170 static inline int extent_compress_type(unsigned long bio_flags
)
172 return bio_flags
>> EXTENT_BIO_FLAG_SHIFT
;
175 struct extent_map_tree
;
177 typedef struct extent_map
*(get_extent_t
)(struct inode
*inode
,
183 void extent_io_tree_init(struct extent_io_tree
*tree
,
184 struct address_space
*mapping
);
185 int try_release_extent_mapping(struct extent_map_tree
*map
,
186 struct extent_io_tree
*tree
, struct page
*page
,
188 int try_release_extent_buffer(struct page
*page
, gfp_t mask
);
189 int try_release_extent_state(struct extent_map_tree
*map
,
190 struct extent_io_tree
*tree
, struct page
*page
,
192 int lock_extent(struct extent_io_tree
*tree
, u64 start
, u64 end
);
193 int lock_extent_bits(struct extent_io_tree
*tree
, u64 start
, u64 end
,
194 int bits
, struct extent_state
**cached
);
195 int unlock_extent(struct extent_io_tree
*tree
, u64 start
, u64 end
);
196 int unlock_extent_cached(struct extent_io_tree
*tree
, u64 start
, u64 end
,
197 struct extent_state
**cached
, gfp_t mask
);
198 int try_lock_extent(struct extent_io_tree
*tree
, u64 start
, u64 end
);
199 int extent_read_full_page(struct extent_io_tree
*tree
, struct page
*page
,
200 get_extent_t
*get_extent
, int mirror_num
);
201 int __init
extent_io_init(void);
202 void extent_io_exit(void);
204 u64
count_range_bits(struct extent_io_tree
*tree
,
205 u64
*start
, u64 search_end
,
206 u64 max_bytes
, unsigned long bits
, int contig
);
208 void free_extent_state(struct extent_state
*state
);
209 int test_range_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
210 int bits
, int filled
, struct extent_state
*cached_state
);
211 int clear_extent_bits(struct extent_io_tree
*tree
, u64 start
, u64 end
,
212 int bits
, gfp_t mask
);
213 int clear_extent_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
214 int bits
, int wake
, int delete, struct extent_state
**cached
,
216 int set_extent_bits(struct extent_io_tree
*tree
, u64 start
, u64 end
,
217 int bits
, gfp_t mask
);
218 int set_extent_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
219 int bits
, u64
*failed_start
,
220 struct extent_state
**cached_state
, gfp_t mask
);
221 int set_extent_uptodate(struct extent_io_tree
*tree
, u64 start
, u64 end
,
222 struct extent_state
**cached_state
, gfp_t mask
);
223 int clear_extent_uptodate(struct extent_io_tree
*tree
, u64 start
, u64 end
,
224 struct extent_state
**cached_state
, gfp_t mask
);
225 int set_extent_new(struct extent_io_tree
*tree
, u64 start
, u64 end
,
227 int set_extent_dirty(struct extent_io_tree
*tree
, u64 start
, u64 end
,
229 int clear_extent_dirty(struct extent_io_tree
*tree
, u64 start
, u64 end
,
231 int convert_extent_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
232 int bits
, int clear_bits
,
233 struct extent_state
**cached_state
, gfp_t mask
);
234 int set_extent_delalloc(struct extent_io_tree
*tree
, u64 start
, u64 end
,
235 struct extent_state
**cached_state
, gfp_t mask
);
236 int set_extent_defrag(struct extent_io_tree
*tree
, u64 start
, u64 end
,
237 struct extent_state
**cached_state
, gfp_t mask
);
238 int find_first_extent_bit(struct extent_io_tree
*tree
, u64 start
,
239 u64
*start_ret
, u64
*end_ret
, int bits
,
240 struct extent_state
**cached_state
);
241 struct extent_state
*find_first_extent_bit_state(struct extent_io_tree
*tree
,
242 u64 start
, int bits
);
243 int extent_invalidatepage(struct extent_io_tree
*tree
,
244 struct page
*page
, unsigned long offset
);
245 int extent_write_full_page(struct extent_io_tree
*tree
, struct page
*page
,
246 get_extent_t
*get_extent
,
247 struct writeback_control
*wbc
);
248 int extent_write_locked_range(struct extent_io_tree
*tree
, struct inode
*inode
,
249 u64 start
, u64 end
, get_extent_t
*get_extent
,
251 int extent_writepages(struct extent_io_tree
*tree
,
252 struct address_space
*mapping
,
253 get_extent_t
*get_extent
,
254 struct writeback_control
*wbc
);
255 int btree_write_cache_pages(struct address_space
*mapping
,
256 struct writeback_control
*wbc
);
257 int extent_readpages(struct extent_io_tree
*tree
,
258 struct address_space
*mapping
,
259 struct list_head
*pages
, unsigned nr_pages
,
260 get_extent_t get_extent
);
261 int extent_fiemap(struct inode
*inode
, struct fiemap_extent_info
*fieinfo
,
262 __u64 start
, __u64 len
, get_extent_t
*get_extent
);
263 int set_state_private(struct extent_io_tree
*tree
, u64 start
, u64
private);
264 int get_state_private(struct extent_io_tree
*tree
, u64 start
, u64
*private);
265 void set_page_extent_mapped(struct page
*page
);
267 struct extent_buffer
*alloc_extent_buffer(struct extent_io_tree
*tree
,
268 u64 start
, unsigned long len
);
269 struct extent_buffer
*alloc_dummy_extent_buffer(u64 start
, unsigned long len
);
270 struct extent_buffer
*btrfs_clone_extent_buffer(struct extent_buffer
*src
);
271 struct extent_buffer
*find_extent_buffer(struct extent_io_tree
*tree
,
272 u64 start
, unsigned long len
);
273 void free_extent_buffer(struct extent_buffer
*eb
);
274 void free_extent_buffer_stale(struct extent_buffer
*eb
);
276 #define WAIT_COMPLETE 1
277 #define WAIT_PAGE_LOCK 2
278 int read_extent_buffer_pages(struct extent_io_tree
*tree
,
279 struct extent_buffer
*eb
, u64 start
, int wait
,
280 get_extent_t
*get_extent
, int mirror_num
);
282 static inline unsigned long num_extent_pages(u64 start
, u64 len
)
284 return ((start
+ len
+ PAGE_CACHE_SIZE
- 1) >> PAGE_CACHE_SHIFT
) -
285 (start
>> PAGE_CACHE_SHIFT
);
288 static inline struct page
*extent_buffer_page(struct extent_buffer
*eb
,
294 static inline void extent_buffer_get(struct extent_buffer
*eb
)
296 atomic_inc(&eb
->refs
);
299 int memcmp_extent_buffer(struct extent_buffer
*eb
, const void *ptrv
,
302 void read_extent_buffer(struct extent_buffer
*eb
, void *dst
,
305 void write_extent_buffer(struct extent_buffer
*eb
, const void *src
,
306 unsigned long start
, unsigned long len
);
307 void copy_extent_buffer(struct extent_buffer
*dst
, struct extent_buffer
*src
,
308 unsigned long dst_offset
, unsigned long src_offset
,
310 void memcpy_extent_buffer(struct extent_buffer
*dst
, unsigned long dst_offset
,
311 unsigned long src_offset
, unsigned long len
);
312 void memmove_extent_buffer(struct extent_buffer
*dst
, unsigned long dst_offset
,
313 unsigned long src_offset
, unsigned long len
);
314 void memset_extent_buffer(struct extent_buffer
*eb
, char c
,
315 unsigned long start
, unsigned long len
);
316 void wait_extent_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
, int bits
);
317 void clear_extent_buffer_dirty(struct extent_buffer
*eb
);
318 int set_extent_buffer_dirty(struct extent_buffer
*eb
);
319 int set_extent_buffer_uptodate(struct extent_buffer
*eb
);
320 int clear_extent_buffer_uptodate(struct extent_buffer
*eb
);
321 int extent_buffer_uptodate(struct extent_buffer
*eb
);
322 int map_private_extent_buffer(struct extent_buffer
*eb
, unsigned long offset
,
323 unsigned long min_len
, char **map
,
324 unsigned long *map_start
,
325 unsigned long *map_len
);
326 int extent_range_uptodate(struct extent_io_tree
*tree
,
328 int extent_clear_unlock_delalloc(struct inode
*inode
,
329 struct extent_io_tree
*tree
,
330 u64 start
, u64 end
, struct page
*locked_page
,
333 btrfs_bio_alloc(struct block_device
*bdev
, u64 first_sector
, int nr_vecs
,
336 struct btrfs_fs_info
;
338 int repair_io_failure(struct btrfs_fs_info
*fs_info
, u64 start
,
339 u64 length
, u64 logical
, struct page
*page
,
341 int end_extent_writepage(struct page
*page
, int err
, u64 start
, u64 end
);
342 int repair_eb_io_failure(struct btrfs_root
*root
, struct extent_buffer
*eb
,