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
26 * page->private values. Every page that is controlled by the extent
27 * map has page->private set to one.
29 #define EXTENT_PAGE_PRIVATE 1
30 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
34 typedef int (extent_submit_bio_hook_t
)(struct inode
*inode
, int rw
,
35 struct bio
*bio
, int mirror_num
,
36 unsigned long bio_flags
);
37 struct extent_io_ops
{
38 int (*fill_delalloc
)(struct inode
*inode
, struct page
*locked_page
,
39 u64 start
, u64 end
, int *page_started
,
40 unsigned long *nr_written
);
41 int (*writepage_start_hook
)(struct page
*page
, u64 start
, u64 end
);
42 int (*writepage_io_hook
)(struct page
*page
, u64 start
, u64 end
);
43 extent_submit_bio_hook_t
*submit_bio_hook
;
44 int (*merge_bio_hook
)(struct page
*page
, unsigned long offset
,
45 size_t size
, struct bio
*bio
,
46 unsigned long bio_flags
);
47 int (*readpage_io_hook
)(struct page
*page
, u64 start
, u64 end
);
48 int (*readpage_io_failed_hook
)(struct bio
*bio
, struct page
*page
,
50 struct extent_state
*state
);
51 int (*writepage_io_failed_hook
)(struct bio
*bio
, struct page
*page
,
53 struct extent_state
*state
);
54 int (*readpage_end_io_hook
)(struct page
*page
, u64 start
, u64 end
,
55 struct extent_state
*state
);
56 int (*writepage_end_io_hook
)(struct page
*page
, u64 start
, u64 end
,
57 struct extent_state
*state
, int uptodate
);
58 int (*set_bit_hook
)(struct inode
*inode
, u64 start
, u64 end
,
59 unsigned long old
, unsigned long bits
);
60 int (*clear_bit_hook
)(struct inode
*inode
, u64 start
, u64 end
,
61 unsigned long old
, unsigned long bits
);
62 int (*write_cache_pages_lock_hook
)(struct page
*page
);
65 struct extent_io_tree
{
67 struct rb_root buffer
;
68 struct address_space
*mapping
;
71 spinlock_t buffer_lock
;
72 struct extent_io_ops
*ops
;
77 u64 end
; /* inclusive */
78 struct rb_node rb_node
;
79 struct extent_io_tree
*tree
;
84 /* for use by the FS */
87 struct list_head leak_list
;
90 struct extent_buffer
{
95 unsigned long map_start
;
96 unsigned long map_len
;
97 struct page
*first_page
;
100 struct list_head leak_list
;
101 struct rb_node rb_node
;
105 struct extent_map_tree
;
107 static inline struct extent_state
*extent_state_next(struct extent_state
*state
)
109 struct rb_node
*node
;
110 node
= rb_next(&state
->rb_node
);
113 return rb_entry(node
, struct extent_state
, rb_node
);
116 typedef struct extent_map
*(get_extent_t
)(struct inode
*inode
,
122 void extent_io_tree_init(struct extent_io_tree
*tree
,
123 struct address_space
*mapping
, gfp_t mask
);
124 int try_release_extent_mapping(struct extent_map_tree
*map
,
125 struct extent_io_tree
*tree
, struct page
*page
,
127 int try_release_extent_buffer(struct extent_io_tree
*tree
, struct page
*page
);
128 int try_release_extent_state(struct extent_map_tree
*map
,
129 struct extent_io_tree
*tree
, struct page
*page
,
131 int lock_extent(struct extent_io_tree
*tree
, u64 start
, u64 end
, gfp_t mask
);
132 int unlock_extent(struct extent_io_tree
*tree
, u64 start
, u64 end
, gfp_t mask
);
133 int try_lock_extent(struct extent_io_tree
*tree
, u64 start
, u64 end
,
135 int extent_read_full_page(struct extent_io_tree
*tree
, struct page
*page
,
136 get_extent_t
*get_extent
);
137 int __init
extent_io_init(void);
138 void extent_io_exit(void);
140 u64
count_range_bits(struct extent_io_tree
*tree
,
141 u64
*start
, u64 search_end
,
142 u64 max_bytes
, unsigned long bits
);
144 int test_range_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
145 int bits
, int filled
);
146 int clear_extent_bits(struct extent_io_tree
*tree
, u64 start
, u64 end
,
147 int bits
, gfp_t mask
);
148 int clear_extent_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
149 int bits
, int wake
, int delete, gfp_t mask
);
150 int set_extent_bits(struct extent_io_tree
*tree
, u64 start
, u64 end
,
151 int bits
, gfp_t mask
);
152 int set_extent_uptodate(struct extent_io_tree
*tree
, u64 start
, u64 end
,
154 int set_extent_new(struct extent_io_tree
*tree
, u64 start
, u64 end
,
156 int set_extent_dirty(struct extent_io_tree
*tree
, u64 start
, u64 end
,
158 int clear_extent_dirty(struct extent_io_tree
*tree
, u64 start
, u64 end
,
160 int clear_extent_ordered(struct extent_io_tree
*tree
, u64 start
, u64 end
,
162 int clear_extent_ordered_metadata(struct extent_io_tree
*tree
, u64 start
,
163 u64 end
, gfp_t mask
);
164 int set_extent_delalloc(struct extent_io_tree
*tree
, u64 start
, u64 end
,
166 int set_extent_ordered(struct extent_io_tree
*tree
, u64 start
, u64 end
,
168 int find_first_extent_bit(struct extent_io_tree
*tree
, u64 start
,
169 u64
*start_ret
, u64
*end_ret
, int bits
);
170 struct extent_state
*find_first_extent_bit_state(struct extent_io_tree
*tree
,
171 u64 start
, int bits
);
172 int extent_invalidatepage(struct extent_io_tree
*tree
,
173 struct page
*page
, unsigned long offset
);
174 int extent_write_full_page(struct extent_io_tree
*tree
, struct page
*page
,
175 get_extent_t
*get_extent
,
176 struct writeback_control
*wbc
);
177 int extent_write_locked_range(struct extent_io_tree
*tree
, struct inode
*inode
,
178 u64 start
, u64 end
, get_extent_t
*get_extent
,
180 int extent_writepages(struct extent_io_tree
*tree
,
181 struct address_space
*mapping
,
182 get_extent_t
*get_extent
,
183 struct writeback_control
*wbc
);
184 int extent_readpages(struct extent_io_tree
*tree
,
185 struct address_space
*mapping
,
186 struct list_head
*pages
, unsigned nr_pages
,
187 get_extent_t get_extent
);
188 int extent_prepare_write(struct extent_io_tree
*tree
,
189 struct inode
*inode
, struct page
*page
,
190 unsigned from
, unsigned to
, get_extent_t
*get_extent
);
191 int extent_commit_write(struct extent_io_tree
*tree
,
192 struct inode
*inode
, struct page
*page
,
193 unsigned from
, unsigned to
);
194 sector_t
extent_bmap(struct address_space
*mapping
, sector_t iblock
,
195 get_extent_t
*get_extent
);
196 int set_range_dirty(struct extent_io_tree
*tree
, u64 start
, u64 end
);
197 int set_state_private(struct extent_io_tree
*tree
, u64 start
, u64
private);
198 int get_state_private(struct extent_io_tree
*tree
, u64 start
, u64
*private);
199 void set_page_extent_mapped(struct page
*page
);
201 struct extent_buffer
*alloc_extent_buffer(struct extent_io_tree
*tree
,
202 u64 start
, unsigned long len
,
205 struct extent_buffer
*find_extent_buffer(struct extent_io_tree
*tree
,
206 u64 start
, unsigned long len
,
208 void free_extent_buffer(struct extent_buffer
*eb
);
209 int read_extent_buffer_pages(struct extent_io_tree
*tree
,
210 struct extent_buffer
*eb
, u64 start
, int wait
,
211 get_extent_t
*get_extent
, int mirror_num
);
213 static inline void extent_buffer_get(struct extent_buffer
*eb
)
215 atomic_inc(&eb
->refs
);
218 int memcmp_extent_buffer(struct extent_buffer
*eb
, const void *ptrv
,
221 void read_extent_buffer(struct extent_buffer
*eb
, void *dst
,
224 void write_extent_buffer(struct extent_buffer
*eb
, const void *src
,
225 unsigned long start
, unsigned long len
);
226 void copy_extent_buffer(struct extent_buffer
*dst
, struct extent_buffer
*src
,
227 unsigned long dst_offset
, unsigned long src_offset
,
229 void memcpy_extent_buffer(struct extent_buffer
*dst
, unsigned long dst_offset
,
230 unsigned long src_offset
, unsigned long len
);
231 void memmove_extent_buffer(struct extent_buffer
*dst
, unsigned long dst_offset
,
232 unsigned long src_offset
, unsigned long len
);
233 void memset_extent_buffer(struct extent_buffer
*eb
, char c
,
234 unsigned long start
, unsigned long len
);
235 int wait_on_extent_buffer_writeback(struct extent_io_tree
*tree
,
236 struct extent_buffer
*eb
);
237 int wait_on_extent_writeback(struct extent_io_tree
*tree
, u64 start
, u64 end
);
238 int wait_extent_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
, int bits
);
239 int clear_extent_buffer_dirty(struct extent_io_tree
*tree
,
240 struct extent_buffer
*eb
);
241 int set_extent_buffer_dirty(struct extent_io_tree
*tree
,
242 struct extent_buffer
*eb
);
243 int set_extent_buffer_uptodate(struct extent_io_tree
*tree
,
244 struct extent_buffer
*eb
);
245 int clear_extent_buffer_uptodate(struct extent_io_tree
*tree
,
246 struct extent_buffer
*eb
);
247 int extent_buffer_uptodate(struct extent_io_tree
*tree
,
248 struct extent_buffer
*eb
);
249 int map_extent_buffer(struct extent_buffer
*eb
, unsigned long offset
,
250 unsigned long min_len
, char **token
, char **map
,
251 unsigned long *map_start
,
252 unsigned long *map_len
, int km
);
253 int map_private_extent_buffer(struct extent_buffer
*eb
, unsigned long offset
,
254 unsigned long min_len
, char **token
, char **map
,
255 unsigned long *map_start
,
256 unsigned long *map_len
, int km
);
257 void unmap_extent_buffer(struct extent_buffer
*eb
, char *token
, int km
);
258 int release_extent_buffer_tail_pages(struct extent_buffer
*eb
);
259 int extent_range_uptodate(struct extent_io_tree
*tree
,
261 int extent_clear_unlock_delalloc(struct inode
*inode
,
262 struct extent_io_tree
*tree
,
263 u64 start
, u64 end
, struct page
*locked_page
,
266 int clear_delalloc
, int clear_dirty
,