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_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
21 * page->private values. Every page that is controlled by the extent
22 * map has page->private set to one.
24 #define EXTENT_PAGE_PRIVATE 1
25 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
29 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
30 struct bio *bio, int mirror_num);
31 struct extent_io_ops {
32 int (*fill_delalloc)(struct inode *inode, u64 start, u64 end);
33 int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
34 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
35 extent_submit_bio_hook_t *submit_bio_hook;
36 int (*merge_bio_hook)(struct page *page, unsigned long offset,
37 size_t size, struct bio *bio);
38 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
39 int (*readpage_io_failed_hook)(struct bio *bio, struct page *page,
41 struct extent_state *state);
42 int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
44 struct extent_state *state);
45 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
46 struct extent_state *state);
47 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
48 struct extent_state *state, int uptodate);
49 int (*set_bit_hook)(struct inode *inode, u64 start, u64 end,
50 unsigned long old, unsigned long bits);
51 int (*clear_bit_hook)(struct inode *inode, u64 start, u64 end,
52 unsigned long old, unsigned long bits);
53 int (*write_cache_pages_lock_hook)(struct page *page);
56 struct extent_io_tree {
58 struct rb_root buffer;
59 struct address_space *mapping;
62 spinlock_t buffer_lock;
63 struct extent_io_ops *ops;
68 u64 end; /* inclusive */
69 struct rb_node rb_node;
70 struct extent_io_tree *tree;
75 /* for use by the FS */
78 struct list_head leak_list;
81 struct extent_buffer {
86 unsigned long map_start;
87 unsigned long map_len;
88 struct page *first_page;
91 struct list_head leak_list;
92 struct rb_node rb_node;
96 struct extent_map_tree;
98 static inline struct extent_state *extent_state_next(struct extent_state *state)
100 struct rb_node *node;
101 node = rb_next(&state->rb_node);
104 return rb_entry(node, struct extent_state, rb_node);
107 typedef struct extent_map *(get_extent_t)(struct inode *inode,
113 void extent_io_tree_init(struct extent_io_tree *tree,
114 struct address_space *mapping, gfp_t mask);
115 int try_release_extent_mapping(struct extent_map_tree *map,
116 struct extent_io_tree *tree, struct page *page,
118 int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
119 int try_release_extent_state(struct extent_map_tree *map,
120 struct extent_io_tree *tree, struct page *page,
122 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
123 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
124 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
125 get_extent_t *get_extent);
126 int __init extent_io_init(void);
127 void extent_io_exit(void);
129 u64 count_range_bits(struct extent_io_tree *tree,
130 u64 *start, u64 search_end,
131 u64 max_bytes, unsigned long bits);
133 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
134 int bits, int filled);
135 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
136 int bits, gfp_t mask);
137 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
138 int bits, int wake, int delete, gfp_t mask);
139 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
140 int bits, gfp_t mask);
141 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
143 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
145 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
147 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
149 int clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
151 int clear_extent_ordered_metadata(struct extent_io_tree *tree, u64 start,
152 u64 end, gfp_t mask);
153 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
155 int set_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
157 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
158 u64 *start_ret, u64 *end_ret, int bits);
159 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
160 u64 start, int bits);
161 int extent_invalidatepage(struct extent_io_tree *tree,
162 struct page *page, unsigned long offset);
163 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
164 get_extent_t *get_extent,
165 struct writeback_control *wbc);
166 int extent_writepages(struct extent_io_tree *tree,
167 struct address_space *mapping,
168 get_extent_t *get_extent,
169 struct writeback_control *wbc);
170 int extent_readpages(struct extent_io_tree *tree,
171 struct address_space *mapping,
172 struct list_head *pages, unsigned nr_pages,
173 get_extent_t get_extent);
174 int extent_prepare_write(struct extent_io_tree *tree,
175 struct inode *inode, struct page *page,
176 unsigned from, unsigned to, get_extent_t *get_extent);
177 int extent_commit_write(struct extent_io_tree *tree,
178 struct inode *inode, struct page *page,
179 unsigned from, unsigned to);
180 sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
181 get_extent_t *get_extent);
182 int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
183 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
184 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
185 void set_page_extent_mapped(struct page *page);
187 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
188 u64 start, unsigned long len,
191 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
192 u64 start, unsigned long len,
194 void free_extent_buffer(struct extent_buffer *eb);
195 int read_extent_buffer_pages(struct extent_io_tree *tree,
196 struct extent_buffer *eb, u64 start, int wait,
197 get_extent_t *get_extent, int mirror_num);
199 static inline void extent_buffer_get(struct extent_buffer *eb)
201 atomic_inc(&eb->refs);
204 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
207 void read_extent_buffer(struct extent_buffer *eb, void *dst,
210 void write_extent_buffer(struct extent_buffer *eb, const void *src,
211 unsigned long start, unsigned long len);
212 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
213 unsigned long dst_offset, unsigned long src_offset,
215 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
216 unsigned long src_offset, unsigned long len);
217 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
218 unsigned long src_offset, unsigned long len);
219 void memset_extent_buffer(struct extent_buffer *eb, char c,
220 unsigned long start, unsigned long len);
221 int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
222 struct extent_buffer *eb);
223 int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end);
224 int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
225 int clear_extent_buffer_dirty(struct extent_io_tree *tree,
226 struct extent_buffer *eb);
227 int set_extent_buffer_dirty(struct extent_io_tree *tree,
228 struct extent_buffer *eb);
229 int set_extent_buffer_uptodate(struct extent_io_tree *tree,
230 struct extent_buffer *eb);
231 int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
232 struct extent_buffer *eb);
233 int extent_buffer_uptodate(struct extent_io_tree *tree,
234 struct extent_buffer *eb);
235 int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
236 unsigned long min_len, char **token, char **map,
237 unsigned long *map_start,
238 unsigned long *map_len, int km);
239 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
240 unsigned long min_len, char **token, char **map,
241 unsigned long *map_start,
242 unsigned long *map_len, int km);
243 void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
244 int release_extent_buffer_tail_pages(struct extent_buffer *eb);
245 int extent_range_uptodate(struct extent_io_tree *tree,