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_BOUNDARY (1 << 9)
15 #define EXTENT_NODATASUM (1 << 10)
16 #define EXTENT_DO_ACCOUNTING (1 << 11)
17 #define EXTENT_FIRST_DELALLOC (1 << 12)
18 #define EXTENT_NEED_WAIT (1 << 13)
19 #define EXTENT_DAMAGED (1 << 14)
20 #define EXTENT_NORESERVE (1 << 15)
21 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
22 #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
25 * flags for bio submission. The high bits indicate the compression
28 #define EXTENT_BIO_COMPRESSED 1
29 #define EXTENT_BIO_TREE_LOG 2
30 #define EXTENT_BIO_PARENT_LOCKED 4
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_DIRTY 2
36 #define EXTENT_BUFFER_CORRUPT 3
37 #define EXTENT_BUFFER_READAHEAD 4 /* this got triggered by readahead */
38 #define EXTENT_BUFFER_TREE_REF 5
39 #define EXTENT_BUFFER_STALE 6
40 #define EXTENT_BUFFER_WRITEBACK 7
41 #define EXTENT_BUFFER_READ_ERR 8 /* read IO error */
42 #define EXTENT_BUFFER_DUMMY 9
43 #define EXTENT_BUFFER_IN_TREE 10
44 #define EXTENT_BUFFER_WRITE_ERR 11 /* write IO error */
46 /* these are flags for extent_clear_unlock_delalloc */
47 #define PAGE_UNLOCK (1 << 0)
48 #define PAGE_CLEAR_DIRTY (1 << 1)
49 #define PAGE_SET_WRITEBACK (1 << 2)
50 #define PAGE_END_WRITEBACK (1 << 3)
51 #define PAGE_SET_PRIVATE2 (1 << 4)
54 * page->private values. Every page that is controlled by the extent
55 * map has page->private set to one.
57 #define EXTENT_PAGE_PRIVATE 1
63 typedef int (extent_submit_bio_hook_t
)(struct inode
*inode
, int rw
,
64 struct bio
*bio
, int mirror_num
,
65 unsigned long bio_flags
, u64 bio_offset
);
66 struct extent_io_ops
{
67 int (*fill_delalloc
)(struct inode
*inode
, struct page
*locked_page
,
68 u64 start
, u64 end
, int *page_started
,
69 unsigned long *nr_written
);
70 int (*writepage_start_hook
)(struct page
*page
, u64 start
, u64 end
);
71 int (*writepage_io_hook
)(struct page
*page
, u64 start
, u64 end
);
72 extent_submit_bio_hook_t
*submit_bio_hook
;
73 int (*merge_bio_hook
)(int rw
, struct page
*page
, unsigned long offset
,
74 size_t size
, struct bio
*bio
,
75 unsigned long bio_flags
);
76 int (*readpage_io_failed_hook
)(struct page
*page
, int failed_mirror
);
77 int (*readpage_end_io_hook
)(struct btrfs_io_bio
*io_bio
, u64 phy_offset
,
78 struct page
*page
, u64 start
, u64 end
,
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
);
93 struct extent_io_tree
{
95 struct address_space
*mapping
;
99 struct extent_io_ops
*ops
;
102 struct extent_state
{
104 u64 end
; /* inclusive */
105 struct rb_node rb_node
;
107 /* ADD NEW ELEMENTS AFTER THIS */
108 wait_queue_head_t wq
;
112 /* for use by the FS */
115 #ifdef CONFIG_BTRFS_DEBUG
116 struct list_head leak_list
;
120 #define INLINE_EXTENT_BUFFER_PAGES 16
121 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
122 struct extent_buffer
{
125 unsigned long bflags
;
126 struct btrfs_fs_info
*fs_info
;
127 spinlock_t refs_lock
;
131 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
;
142 /* >= 0 if eb belongs to a log tree, -1 otherwise */
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 struct page
*pages
[INLINE_EXTENT_BUFFER_PAGES
];
158 #ifdef CONFIG_BTRFS_DEBUG
159 struct list_head leak_list
;
163 static inline void extent_set_compress_type(unsigned long *bio_flags
,
166 *bio_flags
|= compress_type
<< EXTENT_BIO_FLAG_SHIFT
;
169 static inline int extent_compress_type(unsigned long bio_flags
)
171 return bio_flags
>> EXTENT_BIO_FLAG_SHIFT
;
174 struct extent_map_tree
;
176 typedef struct extent_map
*(get_extent_t
)(struct inode
*inode
,
182 void extent_io_tree_init(struct extent_io_tree
*tree
,
183 struct address_space
*mapping
);
184 int try_release_extent_mapping(struct extent_map_tree
*map
,
185 struct extent_io_tree
*tree
, struct page
*page
,
187 int try_release_extent_buffer(struct page
*page
);
188 int lock_extent(struct extent_io_tree
*tree
, u64 start
, u64 end
);
189 int lock_extent_bits(struct extent_io_tree
*tree
, u64 start
, u64 end
,
190 unsigned long bits
, struct extent_state
**cached
);
191 int unlock_extent(struct extent_io_tree
*tree
, u64 start
, u64 end
);
192 int unlock_extent_cached(struct extent_io_tree
*tree
, u64 start
, u64 end
,
193 struct extent_state
**cached
, gfp_t mask
);
194 int try_lock_extent(struct extent_io_tree
*tree
, u64 start
, u64 end
);
195 int extent_read_full_page(struct extent_io_tree
*tree
, struct page
*page
,
196 get_extent_t
*get_extent
, int mirror_num
);
197 int extent_read_full_page_nolock(struct extent_io_tree
*tree
, struct page
*page
,
198 get_extent_t
*get_extent
, int mirror_num
);
199 int __init
extent_io_init(void);
200 void extent_io_exit(void);
202 u64
count_range_bits(struct extent_io_tree
*tree
,
203 u64
*start
, u64 search_end
,
204 u64 max_bytes
, unsigned long bits
, int contig
);
206 void free_extent_state(struct extent_state
*state
);
207 int test_range_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
208 unsigned long bits
, int filled
,
209 struct extent_state
*cached_state
);
210 int clear_extent_bits(struct extent_io_tree
*tree
, u64 start
, u64 end
,
211 unsigned long bits
, gfp_t mask
);
212 int clear_extent_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
213 unsigned long bits
, int wake
, int delete,
214 struct extent_state
**cached
, gfp_t mask
);
215 int set_extent_bits(struct extent_io_tree
*tree
, u64 start
, u64 end
,
216 unsigned long bits
, gfp_t mask
);
217 int set_extent_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
218 unsigned long 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 clear_extent_uptodate(struct extent_io_tree
*tree
, u64 start
, u64 end
,
223 struct extent_state
**cached_state
, gfp_t mask
);
224 int set_extent_new(struct extent_io_tree
*tree
, u64 start
, u64 end
,
226 int set_extent_dirty(struct extent_io_tree
*tree
, u64 start
, u64 end
,
228 int clear_extent_dirty(struct extent_io_tree
*tree
, u64 start
, u64 end
,
230 int convert_extent_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
231 unsigned long bits
, unsigned long clear_bits
,
232 struct extent_state
**cached_state
, gfp_t mask
);
233 int set_extent_delalloc(struct extent_io_tree
*tree
, u64 start
, u64 end
,
234 struct extent_state
**cached_state
, gfp_t mask
);
235 int set_extent_defrag(struct extent_io_tree
*tree
, u64 start
, u64 end
,
236 struct extent_state
**cached_state
, gfp_t mask
);
237 int find_first_extent_bit(struct extent_io_tree
*tree
, u64 start
,
238 u64
*start_ret
, u64
*end_ret
, unsigned long bits
,
239 struct extent_state
**cached_state
);
240 int extent_invalidatepage(struct extent_io_tree
*tree
,
241 struct page
*page
, unsigned long offset
);
242 int extent_write_full_page(struct extent_io_tree
*tree
, struct page
*page
,
243 get_extent_t
*get_extent
,
244 struct writeback_control
*wbc
);
245 int extent_write_locked_range(struct extent_io_tree
*tree
, struct inode
*inode
,
246 u64 start
, u64 end
, get_extent_t
*get_extent
,
248 int extent_writepages(struct extent_io_tree
*tree
,
249 struct address_space
*mapping
,
250 get_extent_t
*get_extent
,
251 struct writeback_control
*wbc
);
252 int btree_write_cache_pages(struct address_space
*mapping
,
253 struct writeback_control
*wbc
);
254 int extent_readpages(struct extent_io_tree
*tree
,
255 struct address_space
*mapping
,
256 struct list_head
*pages
, unsigned nr_pages
,
257 get_extent_t get_extent
);
258 int extent_fiemap(struct inode
*inode
, struct fiemap_extent_info
*fieinfo
,
259 __u64 start
, __u64 len
, get_extent_t
*get_extent
);
260 int get_state_private(struct extent_io_tree
*tree
, u64 start
, u64
*private);
261 void set_page_extent_mapped(struct page
*page
);
263 struct extent_buffer
*alloc_extent_buffer(struct btrfs_fs_info
*fs_info
,
264 u64 start
, unsigned long len
);
265 struct extent_buffer
*alloc_dummy_extent_buffer(u64 start
, unsigned long len
);
266 struct extent_buffer
*btrfs_clone_extent_buffer(struct extent_buffer
*src
);
267 struct extent_buffer
*find_extent_buffer(struct btrfs_fs_info
*fs_info
,
269 void free_extent_buffer(struct extent_buffer
*eb
);
270 void free_extent_buffer_stale(struct extent_buffer
*eb
);
272 #define WAIT_COMPLETE 1
273 #define WAIT_PAGE_LOCK 2
274 int read_extent_buffer_pages(struct extent_io_tree
*tree
,
275 struct extent_buffer
*eb
, u64 start
, int wait
,
276 get_extent_t
*get_extent
, int mirror_num
);
277 void wait_on_extent_buffer_writeback(struct extent_buffer
*eb
);
279 static inline unsigned long num_extent_pages(u64 start
, u64 len
)
281 return ((start
+ len
+ PAGE_CACHE_SIZE
- 1) >> PAGE_CACHE_SHIFT
) -
282 (start
>> PAGE_CACHE_SHIFT
);
285 static inline void extent_buffer_get(struct extent_buffer
*eb
)
287 atomic_inc(&eb
->refs
);
290 int memcmp_extent_buffer(struct extent_buffer
*eb
, const void *ptrv
,
293 void read_extent_buffer(struct extent_buffer
*eb
, void *dst
,
296 int read_extent_buffer_to_user(struct extent_buffer
*eb
, void __user
*dst
,
299 void write_extent_buffer(struct extent_buffer
*eb
, const void *src
,
300 unsigned long start
, unsigned long len
);
301 void copy_extent_buffer(struct extent_buffer
*dst
, struct extent_buffer
*src
,
302 unsigned long dst_offset
, unsigned long src_offset
,
304 void memcpy_extent_buffer(struct extent_buffer
*dst
, unsigned long dst_offset
,
305 unsigned long src_offset
, unsigned long len
);
306 void memmove_extent_buffer(struct extent_buffer
*dst
, unsigned long dst_offset
,
307 unsigned long src_offset
, unsigned long len
);
308 void memset_extent_buffer(struct extent_buffer
*eb
, char c
,
309 unsigned long start
, unsigned long len
);
310 void clear_extent_buffer_dirty(struct extent_buffer
*eb
);
311 int set_extent_buffer_dirty(struct extent_buffer
*eb
);
312 int set_extent_buffer_uptodate(struct extent_buffer
*eb
);
313 int clear_extent_buffer_uptodate(struct extent_buffer
*eb
);
314 int extent_buffer_uptodate(struct extent_buffer
*eb
);
315 int extent_buffer_under_io(struct extent_buffer
*eb
);
316 int map_private_extent_buffer(struct extent_buffer
*eb
, unsigned long offset
,
317 unsigned long min_len
, char **map
,
318 unsigned long *map_start
,
319 unsigned long *map_len
);
320 int extent_range_clear_dirty_for_io(struct inode
*inode
, u64 start
, u64 end
);
321 int extent_range_redirty_for_io(struct inode
*inode
, u64 start
, u64 end
);
322 int extent_clear_unlock_delalloc(struct inode
*inode
, u64 start
, u64 end
,
323 struct page
*locked_page
,
324 unsigned long bits_to_clear
,
325 unsigned long page_ops
);
327 btrfs_bio_alloc(struct block_device
*bdev
, u64 first_sector
, int nr_vecs
,
329 struct bio
*btrfs_io_bio_alloc(gfp_t gfp_mask
, unsigned int nr_iovecs
);
330 struct bio
*btrfs_bio_clone(struct bio
*bio
, gfp_t gfp_mask
);
332 struct btrfs_fs_info
;
334 int repair_io_failure(struct inode
*inode
, u64 start
, u64 length
, u64 logical
,
335 struct page
*page
, unsigned int pg_offset
,
337 int clean_io_failure(struct inode
*inode
, u64 start
, struct page
*page
,
338 unsigned int pg_offset
);
339 int end_extent_writepage(struct page
*page
, int err
, u64 start
, u64 end
);
340 int repair_eb_io_failure(struct btrfs_root
*root
, struct extent_buffer
*eb
,
344 * When IO fails, either with EIO or csum verification fails, we
345 * try other mirrors that might have a good copy of the data. This
346 * io_failure_record is used to record state as we go through all the
347 * mirrors. If another mirror has good data, the page is set up to date
348 * and things continue. If a good mirror can't be found, the original
349 * bio end_io callback is called to indicate things have failed.
351 struct io_failure_record
{
356 unsigned long bio_flags
;
362 void btrfs_free_io_failure_record(struct inode
*inode
, u64 start
, u64 end
);
363 int btrfs_get_io_failure_record(struct inode
*inode
, u64 start
, u64 end
,
364 struct io_failure_record
**failrec_ret
);
365 int btrfs_check_repairable(struct inode
*inode
, struct bio
*failed_bio
,
366 struct io_failure_record
*failrec
, int fail_mirror
);
367 struct bio
*btrfs_create_repair_bio(struct inode
*inode
, struct bio
*failed_bio
,
368 struct io_failure_record
*failrec
,
369 struct page
*page
, int pg_offset
, int icsum
,
370 bio_end_io_t
*endio_func
, void *data
);
371 int free_io_failure(struct inode
*inode
, struct io_failure_record
*rec
);
372 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
373 noinline u64
find_lock_delalloc_range(struct inode
*inode
,
374 struct extent_io_tree
*tree
,
375 struct page
*locked_page
, u64
*start
,
376 u64
*end
, u64 max_bytes
);
378 struct extent_buffer
*alloc_test_extent_buffer(struct btrfs_fs_info
*fs_info
,
379 u64 start
, unsigned long len
);