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_ORDERED (1 << 9)
17 #define EXTENT_ORDERED_METADATA (1 << 10)
18 #define EXTENT_BOUNDARY (1 << 11)
19 #define EXTENT_NODATASUM (1 << 12)
20 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
22 /* flags for bio submission */
23 #define EXTENT_BIO_COMPRESSED 1
25 /* these are bit numbers for test/set bit */
26 #define EXTENT_BUFFER_UPTODATE 0
27 #define EXTENT_BUFFER_BLOCKING 1
28 #define EXTENT_BUFFER_DIRTY 2
31 * page->private values. Every page that is controlled by the extent
32 * map has page->private set to one.
34 #define EXTENT_PAGE_PRIVATE 1
35 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
39 typedef int (extent_submit_bio_hook_t
)(struct inode
*inode
, int rw
,
40 struct bio
*bio
, int mirror_num
,
41 unsigned long bio_flags
);
42 struct extent_io_ops
{
43 int (*fill_delalloc
)(struct inode
*inode
, struct page
*locked_page
,
44 u64 start
, u64 end
, int *page_started
,
45 unsigned long *nr_written
);
46 int (*writepage_start_hook
)(struct page
*page
, u64 start
, u64 end
);
47 int (*writepage_io_hook
)(struct page
*page
, u64 start
, u64 end
);
48 extent_submit_bio_hook_t
*submit_bio_hook
;
49 int (*merge_bio_hook
)(struct page
*page
, unsigned long offset
,
50 size_t size
, struct bio
*bio
,
51 unsigned long bio_flags
);
52 int (*readpage_io_hook
)(struct page
*page
, u64 start
, u64 end
);
53 int (*readpage_io_failed_hook
)(struct bio
*bio
, struct page
*page
,
55 struct extent_state
*state
);
56 int (*writepage_io_failed_hook
)(struct bio
*bio
, struct page
*page
,
58 struct extent_state
*state
);
59 int (*readpage_end_io_hook
)(struct page
*page
, u64 start
, u64 end
,
60 struct extent_state
*state
);
61 int (*writepage_end_io_hook
)(struct page
*page
, u64 start
, u64 end
,
62 struct extent_state
*state
, int uptodate
);
63 int (*set_bit_hook
)(struct inode
*inode
, u64 start
, u64 end
,
64 unsigned long old
, unsigned long bits
);
65 int (*clear_bit_hook
)(struct inode
*inode
, u64 start
, u64 end
,
66 unsigned long old
, unsigned long bits
);
67 int (*write_cache_pages_lock_hook
)(struct page
*page
);
70 struct extent_io_tree
{
72 struct rb_root buffer
;
73 struct address_space
*mapping
;
76 spinlock_t buffer_lock
;
77 struct extent_io_ops
*ops
;
82 u64 end
; /* inclusive */
83 struct rb_node rb_node
;
84 struct extent_io_tree
*tree
;
89 /* for use by the FS */
92 struct list_head leak_list
;
95 struct extent_buffer
{
100 unsigned long map_start
;
101 unsigned long map_len
;
102 struct page
*first_page
;
103 unsigned long bflags
;
105 struct list_head leak_list
;
106 struct rb_node rb_node
;
108 /* the spinlock is used to protect most operations */
112 * when we keep the lock held while blocking, waiters go onto
115 wait_queue_head_t lock_wq
;
118 struct extent_map_tree
;
120 static inline struct extent_state
*extent_state_next(struct extent_state
*state
)
122 struct rb_node
*node
;
123 node
= rb_next(&state
->rb_node
);
126 return rb_entry(node
, struct extent_state
, rb_node
);
129 typedef struct extent_map
*(get_extent_t
)(struct inode
*inode
,
135 void extent_io_tree_init(struct extent_io_tree
*tree
,
136 struct address_space
*mapping
, gfp_t mask
);
137 int try_release_extent_mapping(struct extent_map_tree
*map
,
138 struct extent_io_tree
*tree
, struct page
*page
,
140 int try_release_extent_buffer(struct extent_io_tree
*tree
, struct page
*page
);
141 int try_release_extent_state(struct extent_map_tree
*map
,
142 struct extent_io_tree
*tree
, struct page
*page
,
144 int lock_extent(struct extent_io_tree
*tree
, u64 start
, u64 end
, gfp_t mask
);
145 int lock_extent_bits(struct extent_io_tree
*tree
, u64 start
, u64 end
,
146 int bits
, struct extent_state
**cached
, gfp_t mask
);
147 int unlock_extent(struct extent_io_tree
*tree
, u64 start
, u64 end
, gfp_t mask
);
148 int try_lock_extent(struct extent_io_tree
*tree
, u64 start
, u64 end
,
150 int extent_read_full_page(struct extent_io_tree
*tree
, struct page
*page
,
151 get_extent_t
*get_extent
);
152 int __init
extent_io_init(void);
153 void extent_io_exit(void);
155 u64
count_range_bits(struct extent_io_tree
*tree
,
156 u64
*start
, u64 search_end
,
157 u64 max_bytes
, unsigned long bits
);
159 int test_range_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
160 int bits
, int filled
, struct extent_state
*cached_state
);
161 int clear_extent_bits(struct extent_io_tree
*tree
, u64 start
, u64 end
,
162 int bits
, gfp_t mask
);
163 int clear_extent_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
164 int bits
, int wake
, int delete, struct extent_state
**cached
,
166 int set_extent_bits(struct extent_io_tree
*tree
, u64 start
, u64 end
,
167 int bits
, gfp_t mask
);
168 int set_extent_uptodate(struct extent_io_tree
*tree
, u64 start
, u64 end
,
170 int set_extent_new(struct extent_io_tree
*tree
, u64 start
, u64 end
,
172 int set_extent_dirty(struct extent_io_tree
*tree
, u64 start
, u64 end
,
174 int clear_extent_dirty(struct extent_io_tree
*tree
, u64 start
, u64 end
,
176 int clear_extent_ordered(struct extent_io_tree
*tree
, u64 start
, u64 end
,
178 int clear_extent_ordered_metadata(struct extent_io_tree
*tree
, u64 start
,
179 u64 end
, gfp_t mask
);
180 int set_extent_delalloc(struct extent_io_tree
*tree
, u64 start
, u64 end
,
182 int set_extent_ordered(struct extent_io_tree
*tree
, u64 start
, u64 end
,
184 int find_first_extent_bit(struct extent_io_tree
*tree
, u64 start
,
185 u64
*start_ret
, u64
*end_ret
, int bits
);
186 struct extent_state
*find_first_extent_bit_state(struct extent_io_tree
*tree
,
187 u64 start
, int bits
);
188 int extent_invalidatepage(struct extent_io_tree
*tree
,
189 struct page
*page
, unsigned long offset
);
190 int extent_write_full_page(struct extent_io_tree
*tree
, struct page
*page
,
191 get_extent_t
*get_extent
,
192 struct writeback_control
*wbc
);
193 int extent_write_locked_range(struct extent_io_tree
*tree
, struct inode
*inode
,
194 u64 start
, u64 end
, get_extent_t
*get_extent
,
196 int extent_writepages(struct extent_io_tree
*tree
,
197 struct address_space
*mapping
,
198 get_extent_t
*get_extent
,
199 struct writeback_control
*wbc
);
200 int extent_readpages(struct extent_io_tree
*tree
,
201 struct address_space
*mapping
,
202 struct list_head
*pages
, unsigned nr_pages
,
203 get_extent_t get_extent
);
204 int extent_prepare_write(struct extent_io_tree
*tree
,
205 struct inode
*inode
, struct page
*page
,
206 unsigned from
, unsigned to
, get_extent_t
*get_extent
);
207 int extent_commit_write(struct extent_io_tree
*tree
,
208 struct inode
*inode
, struct page
*page
,
209 unsigned from
, unsigned to
);
210 sector_t
extent_bmap(struct address_space
*mapping
, sector_t iblock
,
211 get_extent_t
*get_extent
);
212 int extent_fiemap(struct inode
*inode
, struct fiemap_extent_info
*fieinfo
,
213 __u64 start
, __u64 len
, get_extent_t
*get_extent
);
214 int set_range_dirty(struct extent_io_tree
*tree
, u64 start
, u64 end
);
215 int set_state_private(struct extent_io_tree
*tree
, u64 start
, u64
private);
216 int get_state_private(struct extent_io_tree
*tree
, u64 start
, u64
*private);
217 void set_page_extent_mapped(struct page
*page
);
219 struct extent_buffer
*alloc_extent_buffer(struct extent_io_tree
*tree
,
220 u64 start
, unsigned long len
,
223 struct extent_buffer
*find_extent_buffer(struct extent_io_tree
*tree
,
224 u64 start
, unsigned long len
,
226 void free_extent_buffer(struct extent_buffer
*eb
);
227 int read_extent_buffer_pages(struct extent_io_tree
*tree
,
228 struct extent_buffer
*eb
, u64 start
, int wait
,
229 get_extent_t
*get_extent
, int mirror_num
);
231 static inline void extent_buffer_get(struct extent_buffer
*eb
)
233 atomic_inc(&eb
->refs
);
236 int memcmp_extent_buffer(struct extent_buffer
*eb
, const void *ptrv
,
239 void read_extent_buffer(struct extent_buffer
*eb
, void *dst
,
242 void write_extent_buffer(struct extent_buffer
*eb
, const void *src
,
243 unsigned long start
, unsigned long len
);
244 void copy_extent_buffer(struct extent_buffer
*dst
, struct extent_buffer
*src
,
245 unsigned long dst_offset
, unsigned long src_offset
,
247 void memcpy_extent_buffer(struct extent_buffer
*dst
, unsigned long dst_offset
,
248 unsigned long src_offset
, unsigned long len
);
249 void memmove_extent_buffer(struct extent_buffer
*dst
, unsigned long dst_offset
,
250 unsigned long src_offset
, unsigned long len
);
251 void memset_extent_buffer(struct extent_buffer
*eb
, char c
,
252 unsigned long start
, unsigned long len
);
253 int wait_on_extent_buffer_writeback(struct extent_io_tree
*tree
,
254 struct extent_buffer
*eb
);
255 int wait_on_extent_writeback(struct extent_io_tree
*tree
, u64 start
, u64 end
);
256 int wait_extent_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
, int bits
);
257 int clear_extent_buffer_dirty(struct extent_io_tree
*tree
,
258 struct extent_buffer
*eb
);
259 int set_extent_buffer_dirty(struct extent_io_tree
*tree
,
260 struct extent_buffer
*eb
);
261 int test_extent_buffer_dirty(struct extent_io_tree
*tree
,
262 struct extent_buffer
*eb
);
263 int set_extent_buffer_uptodate(struct extent_io_tree
*tree
,
264 struct extent_buffer
*eb
);
265 int clear_extent_buffer_uptodate(struct extent_io_tree
*tree
,
266 struct extent_buffer
*eb
);
267 int extent_buffer_uptodate(struct extent_io_tree
*tree
,
268 struct extent_buffer
*eb
);
269 int map_extent_buffer(struct extent_buffer
*eb
, unsigned long offset
,
270 unsigned long min_len
, char **token
, char **map
,
271 unsigned long *map_start
,
272 unsigned long *map_len
, int km
);
273 int map_private_extent_buffer(struct extent_buffer
*eb
, unsigned long offset
,
274 unsigned long min_len
, char **token
, char **map
,
275 unsigned long *map_start
,
276 unsigned long *map_len
, int km
);
277 void unmap_extent_buffer(struct extent_buffer
*eb
, char *token
, int km
);
278 int release_extent_buffer_tail_pages(struct extent_buffer
*eb
);
279 int extent_range_uptodate(struct extent_io_tree
*tree
,
281 int extent_clear_unlock_delalloc(struct inode
*inode
,
282 struct extent_io_tree
*tree
,
283 u64 start
, u64 end
, struct page
*locked_page
,
286 int clear_delalloc
, int clear_dirty
,