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 */
38 #define EXTENT_BUFFER_TREE_REF 5
39 #define EXTENT_BUFFER_STALE 6
41 /* these are flags for extent_clear_unlock_delalloc */
42 #define EXTENT_CLEAR_UNLOCK_PAGE 0x1
43 #define EXTENT_CLEAR_UNLOCK 0x2
44 #define EXTENT_CLEAR_DELALLOC 0x4
45 #define EXTENT_CLEAR_DIRTY 0x8
46 #define EXTENT_SET_WRITEBACK 0x10
47 #define EXTENT_END_WRITEBACK 0x20
48 #define EXTENT_SET_PRIVATE2 0x40
49 #define EXTENT_CLEAR_ACCOUNTING 0x80
52 * page->private values. Every page that is controlled by the extent
53 * map has page->private set to one.
55 #define EXTENT_PAGE_PRIVATE 1
56 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
60 typedef int (extent_submit_bio_hook_t
)(struct inode
*inode
, int rw
,
61 struct bio
*bio
, int mirror_num
,
62 unsigned long bio_flags
, u64 bio_offset
);
63 struct extent_io_ops
{
64 int (*fill_delalloc
)(struct inode
*inode
, struct page
*locked_page
,
65 u64 start
, u64 end
, int *page_started
,
66 unsigned long *nr_written
);
67 int (*writepage_start_hook
)(struct page
*page
, u64 start
, u64 end
);
68 int (*writepage_io_hook
)(struct page
*page
, u64 start
, u64 end
);
69 extent_submit_bio_hook_t
*submit_bio_hook
;
70 int (*merge_bio_hook
)(struct page
*page
, unsigned long offset
,
71 size_t size
, struct bio
*bio
,
72 unsigned long bio_flags
);
73 int (*readpage_io_hook
)(struct page
*page
, u64 start
, u64 end
);
74 int (*readpage_io_failed_hook
)(struct bio
*bio
, struct page
*page
,
75 u64 start
, u64 end
, int failed_mirror
,
76 struct extent_state
*state
);
77 int (*writepage_io_failed_hook
)(struct bio
*bio
, struct page
*page
,
79 struct extent_state
*state
);
80 int (*readpage_end_io_hook
)(struct page
*page
, u64 start
, u64 end
,
81 struct extent_state
*state
);
82 int (*writepage_end_io_hook
)(struct page
*page
, u64 start
, u64 end
,
83 struct extent_state
*state
, int uptodate
);
84 void (*set_bit_hook
)(struct inode
*inode
, struct extent_state
*state
,
86 void (*clear_bit_hook
)(struct inode
*inode
, struct extent_state
*state
,
88 void (*merge_extent_hook
)(struct inode
*inode
,
89 struct extent_state
*new,
90 struct extent_state
*other
);
91 void (*split_extent_hook
)(struct inode
*inode
,
92 struct extent_state
*orig
, u64 split
);
93 int (*write_cache_pages_lock_hook
)(struct page
*page
, void *data
,
94 void (*flush_fn
)(void *));
97 struct extent_io_tree
{
99 struct radix_tree_root buffer
;
100 struct address_space
*mapping
;
103 spinlock_t buffer_lock
;
104 struct extent_io_ops
*ops
;
107 struct extent_state
{
109 u64 end
; /* inclusive */
110 struct rb_node rb_node
;
112 /* ADD NEW ELEMENTS AFTER THIS */
113 struct extent_io_tree
*tree
;
114 wait_queue_head_t wq
;
118 /* for use by the FS */
121 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
;
135 atomic_t pages_reading
;
136 struct list_head leak_list
;
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
*inline_pages
[INLINE_EXTENT_BUFFER_PAGES
];
166 static inline void extent_set_compress_type(unsigned long *bio_flags
,
169 *bio_flags
|= compress_type
<< EXTENT_BIO_FLAG_SHIFT
;
172 static inline int extent_compress_type(unsigned long bio_flags
)
174 return bio_flags
>> EXTENT_BIO_FLAG_SHIFT
;
177 struct extent_map_tree
;
179 typedef struct extent_map
*(get_extent_t
)(struct inode
*inode
,
185 void extent_io_tree_init(struct extent_io_tree
*tree
,
186 struct address_space
*mapping
);
187 int try_release_extent_mapping(struct extent_map_tree
*map
,
188 struct extent_io_tree
*tree
, struct page
*page
,
190 int try_release_extent_buffer(struct page
*page
, gfp_t mask
);
191 int try_release_extent_state(struct extent_map_tree
*map
,
192 struct extent_io_tree
*tree
, struct page
*page
,
194 int lock_extent(struct extent_io_tree
*tree
, u64 start
, u64 end
, gfp_t mask
);
195 int lock_extent_bits(struct extent_io_tree
*tree
, u64 start
, u64 end
,
196 int bits
, struct extent_state
**cached
, gfp_t mask
);
197 int unlock_extent(struct extent_io_tree
*tree
, u64 start
, u64 end
, gfp_t mask
);
198 int unlock_extent_cached(struct extent_io_tree
*tree
, u64 start
, u64 end
,
199 struct extent_state
**cached
, gfp_t mask
);
200 int try_lock_extent(struct extent_io_tree
*tree
, u64 start
, u64 end
,
202 int extent_read_full_page(struct extent_io_tree
*tree
, struct page
*page
,
203 get_extent_t
*get_extent
, int mirror_num
);
204 int __init
extent_io_init(void);
205 void extent_io_exit(void);
207 u64
count_range_bits(struct extent_io_tree
*tree
,
208 u64
*start
, u64 search_end
,
209 u64 max_bytes
, unsigned long bits
, int contig
);
211 void free_extent_state(struct extent_state
*state
);
212 int test_range_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
213 int bits
, int filled
, struct extent_state
*cached_state
);
214 int clear_extent_bits(struct extent_io_tree
*tree
, u64 start
, u64 end
,
215 int bits
, gfp_t mask
);
216 int clear_extent_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
217 int bits
, int wake
, int delete, struct extent_state
**cached
,
219 int set_extent_bits(struct extent_io_tree
*tree
, u64 start
, u64 end
,
220 int bits
, gfp_t mask
);
221 int set_extent_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
222 int bits
, int exclusive_bits
, u64
*failed_start
,
223 struct extent_state
**cached_state
, gfp_t mask
);
224 int set_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
, 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 find_first_extent_bit(struct extent_io_tree
*tree
, u64 start
,
237 u64
*start_ret
, u64
*end_ret
, int bits
);
238 struct extent_state
*find_first_extent_bit_state(struct extent_io_tree
*tree
,
239 u64 start
, int bits
);
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 extent_readpages(struct extent_io_tree
*tree
,
253 struct address_space
*mapping
,
254 struct list_head
*pages
, unsigned nr_pages
,
255 get_extent_t get_extent
);
256 int extent_fiemap(struct inode
*inode
, struct fiemap_extent_info
*fieinfo
,
257 __u64 start
, __u64 len
, get_extent_t
*get_extent
);
258 int set_state_private(struct extent_io_tree
*tree
, u64 start
, u64
private);
259 int get_state_private(struct extent_io_tree
*tree
, u64 start
, u64
*private);
260 void set_page_extent_mapped(struct page
*page
);
262 struct extent_buffer
*alloc_extent_buffer(struct extent_io_tree
*tree
,
263 u64 start
, unsigned long len
);
264 struct extent_buffer
*find_extent_buffer(struct extent_io_tree
*tree
,
265 u64 start
, unsigned long len
);
266 void free_extent_buffer(struct extent_buffer
*eb
);
267 void free_extent_buffer_stale(struct extent_buffer
*eb
);
269 #define WAIT_COMPLETE 1
270 #define WAIT_PAGE_LOCK 2
271 int read_extent_buffer_pages(struct extent_io_tree
*tree
,
272 struct extent_buffer
*eb
, u64 start
, int wait
,
273 get_extent_t
*get_extent
, int mirror_num
);
274 unsigned long num_extent_pages(u64 start
, u64 len
);
275 struct page
*extent_buffer_page(struct extent_buffer
*eb
, unsigned long i
);
277 static inline void extent_buffer_get(struct extent_buffer
*eb
)
279 atomic_inc(&eb
->refs
);
282 int memcmp_extent_buffer(struct extent_buffer
*eb
, const void *ptrv
,
285 void read_extent_buffer(struct extent_buffer
*eb
, void *dst
,
288 void write_extent_buffer(struct extent_buffer
*eb
, const void *src
,
289 unsigned long start
, unsigned long len
);
290 void copy_extent_buffer(struct extent_buffer
*dst
, struct extent_buffer
*src
,
291 unsigned long dst_offset
, unsigned long src_offset
,
293 void memcpy_extent_buffer(struct extent_buffer
*dst
, unsigned long dst_offset
,
294 unsigned long src_offset
, unsigned long len
);
295 void memmove_extent_buffer(struct extent_buffer
*dst
, unsigned long dst_offset
,
296 unsigned long src_offset
, unsigned long len
);
297 void memset_extent_buffer(struct extent_buffer
*eb
, char c
,
298 unsigned long start
, unsigned long len
);
299 int wait_extent_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
, int bits
);
300 int clear_extent_buffer_dirty(struct extent_io_tree
*tree
,
301 struct extent_buffer
*eb
);
302 int set_extent_buffer_dirty(struct extent_io_tree
*tree
,
303 struct extent_buffer
*eb
);
304 int set_extent_buffer_uptodate(struct extent_io_tree
*tree
,
305 struct extent_buffer
*eb
);
306 int clear_extent_buffer_uptodate(struct extent_io_tree
*tree
,
307 struct extent_buffer
*eb
,
308 struct extent_state
**cached_state
);
309 int extent_buffer_uptodate(struct extent_io_tree
*tree
,
310 struct extent_buffer
*eb
,
311 struct extent_state
*cached_state
);
312 int map_private_extent_buffer(struct extent_buffer
*eb
, unsigned long offset
,
313 unsigned long min_len
, char **map
,
314 unsigned long *map_start
,
315 unsigned long *map_len
);
316 int extent_range_uptodate(struct extent_io_tree
*tree
,
318 int extent_clear_unlock_delalloc(struct inode
*inode
,
319 struct extent_io_tree
*tree
,
320 u64 start
, u64 end
, struct page
*locked_page
,
323 btrfs_bio_alloc(struct block_device
*bdev
, u64 first_sector
, int nr_vecs
,
326 struct btrfs_mapping_tree
;
328 int repair_io_failure(struct btrfs_mapping_tree
*map_tree
, u64 start
,
329 u64 length
, u64 logical
, struct page
*page
,
331 int end_extent_writepage(struct page
*page
, int err
, u64 start
, u64 end
);