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 #ifdef CONFIG_BTRFS_DEBUG
120 struct list_head leak_list
;
124 #define INLINE_EXTENT_BUFFER_PAGES 16
125 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
126 struct extent_buffer
{
129 unsigned long map_start
;
130 unsigned long map_len
;
131 unsigned long bflags
;
132 struct extent_io_tree
*tree
;
133 spinlock_t refs_lock
;
137 struct rcu_head rcu_head
;
140 /* count of read lock holders on the extent buffer */
141 atomic_t write_locks
;
143 atomic_t blocking_writers
;
144 atomic_t blocking_readers
;
145 atomic_t spinning_readers
;
146 atomic_t spinning_writers
;
149 /* protects write locks */
152 /* readers use lock_wq while they wait for the write
153 * lock holders to unlock
155 wait_queue_head_t write_lock_wq
;
157 /* writers use read_lock_wq while they wait for readers
160 wait_queue_head_t read_lock_wq
;
161 wait_queue_head_t lock_wq
;
162 struct page
*pages
[INLINE_EXTENT_BUFFER_PAGES
];
163 #ifdef CONFIG_BTRFS_DEBUG
164 struct list_head leak_list
;
168 static inline void extent_set_compress_type(unsigned long *bio_flags
,
171 *bio_flags
|= compress_type
<< EXTENT_BIO_FLAG_SHIFT
;
174 static inline int extent_compress_type(unsigned long bio_flags
)
176 return bio_flags
>> EXTENT_BIO_FLAG_SHIFT
;
179 struct extent_map_tree
;
181 typedef struct extent_map
*(get_extent_t
)(struct inode
*inode
,
187 void extent_io_tree_init(struct extent_io_tree
*tree
,
188 struct address_space
*mapping
);
189 int try_release_extent_mapping(struct extent_map_tree
*map
,
190 struct extent_io_tree
*tree
, struct page
*page
,
192 int try_release_extent_buffer(struct page
*page
, gfp_t mask
);
193 int lock_extent(struct extent_io_tree
*tree
, u64 start
, u64 end
);
194 int lock_extent_bits(struct extent_io_tree
*tree
, u64 start
, u64 end
,
195 int bits
, struct extent_state
**cached
);
196 int unlock_extent(struct extent_io_tree
*tree
, u64 start
, u64 end
);
197 int unlock_extent_cached(struct extent_io_tree
*tree
, u64 start
, u64 end
,
198 struct extent_state
**cached
, gfp_t mask
);
199 int try_lock_extent(struct extent_io_tree
*tree
, u64 start
, u64 end
);
200 int extent_read_full_page(struct extent_io_tree
*tree
, struct page
*page
,
201 get_extent_t
*get_extent
, int mirror_num
);
202 int __init
extent_io_init(void);
203 void extent_io_exit(void);
205 u64
count_range_bits(struct extent_io_tree
*tree
,
206 u64
*start
, u64 search_end
,
207 u64 max_bytes
, unsigned long bits
, int contig
);
209 void free_extent_state(struct extent_state
*state
);
210 int test_range_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
211 int bits
, int filled
, struct extent_state
*cached_state
);
212 int clear_extent_bits(struct extent_io_tree
*tree
, u64 start
, u64 end
,
213 int bits
, gfp_t mask
);
214 int clear_extent_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
215 int bits
, int wake
, int delete, struct extent_state
**cached
,
217 int set_extent_bits(struct extent_io_tree
*tree
, u64 start
, u64 end
,
218 int bits
, gfp_t mask
);
219 int set_extent_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
220 int bits
, u64
*failed_start
,
221 struct extent_state
**cached_state
, gfp_t mask
);
222 int set_extent_uptodate(struct extent_io_tree
*tree
, u64 start
, u64 end
,
223 struct extent_state
**cached_state
, gfp_t mask
);
224 int clear_extent_uptodate(struct extent_io_tree
*tree
, u64 start
, u64 end
,
225 struct extent_state
**cached_state
, gfp_t mask
);
226 int set_extent_new(struct extent_io_tree
*tree
, u64 start
, u64 end
,
228 int set_extent_dirty(struct extent_io_tree
*tree
, u64 start
, u64 end
,
230 int clear_extent_dirty(struct extent_io_tree
*tree
, u64 start
, u64 end
,
232 int convert_extent_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
233 int bits
, int clear_bits
,
234 struct extent_state
**cached_state
, gfp_t mask
);
235 int set_extent_delalloc(struct extent_io_tree
*tree
, u64 start
, u64 end
,
236 struct extent_state
**cached_state
, gfp_t mask
);
237 int set_extent_defrag(struct extent_io_tree
*tree
, u64 start
, u64 end
,
238 struct extent_state
**cached_state
, gfp_t mask
);
239 int find_first_extent_bit(struct extent_io_tree
*tree
, u64 start
,
240 u64
*start_ret
, u64
*end_ret
, int bits
,
241 struct extent_state
**cached_state
);
242 int extent_invalidatepage(struct extent_io_tree
*tree
,
243 struct page
*page
, unsigned long offset
);
244 int extent_write_full_page(struct extent_io_tree
*tree
, struct page
*page
,
245 get_extent_t
*get_extent
,
246 struct writeback_control
*wbc
);
247 int extent_write_locked_range(struct extent_io_tree
*tree
, struct inode
*inode
,
248 u64 start
, u64 end
, get_extent_t
*get_extent
,
250 int extent_writepages(struct extent_io_tree
*tree
,
251 struct address_space
*mapping
,
252 get_extent_t
*get_extent
,
253 struct writeback_control
*wbc
);
254 int btree_write_cache_pages(struct address_space
*mapping
,
255 struct writeback_control
*wbc
);
256 int extent_readpages(struct extent_io_tree
*tree
,
257 struct address_space
*mapping
,
258 struct list_head
*pages
, unsigned nr_pages
,
259 get_extent_t get_extent
);
260 int extent_fiemap(struct inode
*inode
, struct fiemap_extent_info
*fieinfo
,
261 __u64 start
, __u64 len
, get_extent_t
*get_extent
);
262 int set_state_private(struct extent_io_tree
*tree
, u64 start
, u64
private);
263 void extent_cache_csums_dio(struct extent_io_tree
*tree
, u64 start
, u32 csums
[],
265 void extent_cache_csums(struct extent_io_tree
*tree
, struct bio
*bio
,
266 int bvec_index
, u32 csums
[], int count
);
267 int get_state_private(struct extent_io_tree
*tree
, u64 start
, u64
*private);
268 void set_page_extent_mapped(struct page
*page
);
270 struct extent_buffer
*alloc_extent_buffer(struct extent_io_tree
*tree
,
271 u64 start
, unsigned long len
);
272 struct extent_buffer
*alloc_dummy_extent_buffer(u64 start
, unsigned long len
);
273 struct extent_buffer
*btrfs_clone_extent_buffer(struct extent_buffer
*src
);
274 struct extent_buffer
*find_extent_buffer(struct extent_io_tree
*tree
,
275 u64 start
, unsigned long len
);
276 void free_extent_buffer(struct extent_buffer
*eb
);
277 void free_extent_buffer_stale(struct extent_buffer
*eb
);
279 #define WAIT_COMPLETE 1
280 #define WAIT_PAGE_LOCK 2
281 int read_extent_buffer_pages(struct extent_io_tree
*tree
,
282 struct extent_buffer
*eb
, u64 start
, int wait
,
283 get_extent_t
*get_extent
, int mirror_num
);
284 void wait_on_extent_buffer_writeback(struct extent_buffer
*eb
);
286 static inline unsigned long num_extent_pages(u64 start
, u64 len
)
288 return ((start
+ len
+ PAGE_CACHE_SIZE
- 1) >> PAGE_CACHE_SHIFT
) -
289 (start
>> PAGE_CACHE_SHIFT
);
292 static inline struct page
*extent_buffer_page(struct extent_buffer
*eb
,
298 static inline void extent_buffer_get(struct extent_buffer
*eb
)
300 atomic_inc(&eb
->refs
);
303 int memcmp_extent_buffer(struct extent_buffer
*eb
, const void *ptrv
,
306 void read_extent_buffer(struct extent_buffer
*eb
, void *dst
,
309 void write_extent_buffer(struct extent_buffer
*eb
, const void *src
,
310 unsigned long start
, unsigned long len
);
311 void copy_extent_buffer(struct extent_buffer
*dst
, struct extent_buffer
*src
,
312 unsigned long dst_offset
, unsigned long src_offset
,
314 void memcpy_extent_buffer(struct extent_buffer
*dst
, unsigned long dst_offset
,
315 unsigned long src_offset
, unsigned long len
);
316 void memmove_extent_buffer(struct extent_buffer
*dst
, unsigned long dst_offset
,
317 unsigned long src_offset
, unsigned long len
);
318 void memset_extent_buffer(struct extent_buffer
*eb
, char c
,
319 unsigned long start
, unsigned long len
);
320 void clear_extent_buffer_dirty(struct extent_buffer
*eb
);
321 int set_extent_buffer_dirty(struct extent_buffer
*eb
);
322 int set_extent_buffer_uptodate(struct extent_buffer
*eb
);
323 int clear_extent_buffer_uptodate(struct extent_buffer
*eb
);
324 int extent_buffer_uptodate(struct extent_buffer
*eb
);
325 int map_private_extent_buffer(struct extent_buffer
*eb
, unsigned long offset
,
326 unsigned long min_len
, char **map
,
327 unsigned long *map_start
,
328 unsigned long *map_len
);
329 int extent_range_clear_dirty_for_io(struct inode
*inode
, u64 start
, u64 end
);
330 int extent_range_redirty_for_io(struct inode
*inode
, u64 start
, u64 end
);
331 int extent_clear_unlock_delalloc(struct inode
*inode
,
332 struct extent_io_tree
*tree
,
333 u64 start
, u64 end
, struct page
*locked_page
,
336 btrfs_bio_alloc(struct block_device
*bdev
, u64 first_sector
, int nr_vecs
,
339 struct btrfs_fs_info
;
341 int repair_io_failure(struct btrfs_fs_info
*fs_info
, u64 start
,
342 u64 length
, u64 logical
, struct page
*page
,
344 int end_extent_writepage(struct page
*page
, int err
, u64 start
, u64 end
);
345 int repair_eb_io_failure(struct btrfs_root
*root
, struct extent_buffer
*eb
,