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_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
19 * page->private values. Every page that is controlled by the extent
20 * map has page->private set to one.
22 #define EXTENT_PAGE_PRIVATE 1
23 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
27 struct extent_io_ops {
28 int (*fill_delalloc)(struct inode *inode, u64 start, u64 end);
29 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
30 int (*submit_bio_hook)(struct inode *inode, int rw, struct bio *bio,
32 int (*merge_bio_hook)(struct page *page, unsigned long offset,
33 size_t size, struct bio *bio);
34 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
35 int (*readpage_io_failed_hook)(struct bio *bio, struct page *page,
37 struct extent_state *state);
38 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
39 struct extent_state *state);
40 void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
41 struct extent_state *state);
42 int (*set_bit_hook)(struct inode *inode, u64 start, u64 end,
43 unsigned long old, unsigned long bits);
44 int (*clear_bit_hook)(struct inode *inode, u64 start, u64 end,
45 unsigned long old, unsigned long bits);
48 struct extent_io_tree {
50 struct address_space *mapping;
53 struct extent_io_ops *ops;
55 struct list_head buffer_lru;
57 struct extent_state *last;
62 u64 end; /* inclusive */
63 struct rb_node rb_node;
64 struct extent_io_tree *tree;
69 /* for use by the FS */
72 struct list_head leak_list;
75 struct extent_buffer {
80 unsigned long map_start;
81 unsigned long map_len;
82 struct page *first_page;
86 struct list_head leak_list;
89 struct extent_map_tree;
91 static inline struct extent_state *extent_state_next(struct extent_state *state)
94 node = rb_next(&state->rb_node);
97 return rb_entry(node, struct extent_state, rb_node);
100 typedef struct extent_map *(get_extent_t)(struct inode *inode,
106 void extent_io_tree_init(struct extent_io_tree *tree,
107 struct address_space *mapping, gfp_t mask);
108 void extent_io_tree_empty_lru(struct extent_io_tree *tree);
109 int try_release_extent_mapping(struct extent_map_tree *map,
110 struct extent_io_tree *tree, struct page *page,
112 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
113 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
114 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
115 get_extent_t *get_extent);
116 int __init extent_io_init(void);
117 void extent_io_exit(void);
119 u64 count_range_bits(struct extent_io_tree *tree,
120 u64 *start, u64 search_end,
121 u64 max_bytes, unsigned long bits);
123 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
124 int bits, int filled);
125 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
126 int bits, gfp_t mask);
127 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
128 int bits, gfp_t mask);
129 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
131 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
133 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
135 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
137 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
139 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
140 u64 *start_ret, u64 *end_ret, int bits);
141 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
142 u64 start, int bits);
143 int extent_invalidatepage(struct extent_io_tree *tree,
144 struct page *page, unsigned long offset);
145 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
146 get_extent_t *get_extent,
147 struct writeback_control *wbc);
148 int extent_writepages(struct extent_io_tree *tree,
149 struct address_space *mapping,
150 get_extent_t *get_extent,
151 struct writeback_control *wbc);
152 int extent_readpages(struct extent_io_tree *tree,
153 struct address_space *mapping,
154 struct list_head *pages, unsigned nr_pages,
155 get_extent_t get_extent);
156 int extent_prepare_write(struct extent_io_tree *tree,
157 struct inode *inode, struct page *page,
158 unsigned from, unsigned to, get_extent_t *get_extent);
159 int extent_commit_write(struct extent_io_tree *tree,
160 struct inode *inode, struct page *page,
161 unsigned from, unsigned to);
162 sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
163 get_extent_t *get_extent);
164 int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
165 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
166 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
167 void set_page_extent_mapped(struct page *page);
169 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
170 u64 start, unsigned long len,
173 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
174 u64 start, unsigned long len,
176 void free_extent_buffer(struct extent_buffer *eb);
177 int read_extent_buffer_pages(struct extent_io_tree *tree,
178 struct extent_buffer *eb, u64 start, int wait,
179 get_extent_t *get_extent, int mirror_num);
181 static inline void extent_buffer_get(struct extent_buffer *eb)
183 atomic_inc(&eb->refs);
186 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
189 void read_extent_buffer(struct extent_buffer *eb, void *dst,
192 void write_extent_buffer(struct extent_buffer *eb, const void *src,
193 unsigned long start, unsigned long len);
194 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
195 unsigned long dst_offset, unsigned long src_offset,
197 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
198 unsigned long src_offset, unsigned long len);
199 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
200 unsigned long src_offset, unsigned long len);
201 void memset_extent_buffer(struct extent_buffer *eb, char c,
202 unsigned long start, unsigned long len);
203 int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
204 struct extent_buffer *eb);
205 int clear_extent_buffer_dirty(struct extent_io_tree *tree,
206 struct extent_buffer *eb);
207 int set_extent_buffer_dirty(struct extent_io_tree *tree,
208 struct extent_buffer *eb);
209 int set_extent_buffer_uptodate(struct extent_io_tree *tree,
210 struct extent_buffer *eb);
211 int extent_buffer_uptodate(struct extent_io_tree *tree,
212 struct extent_buffer *eb);
213 int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
214 unsigned long min_len, char **token, char **map,
215 unsigned long *map_start,
216 unsigned long *map_len, int km);
217 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
218 unsigned long min_len, char **token, char **map,
219 unsigned long *map_start,
220 unsigned long *map_len, int km);
221 void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
222 int invalidate_extent_lru(struct extent_io_tree *tree, u64 start,
224 int release_extent_buffer_tail_pages(struct extent_buffer *eb);
225 int extent_range_uptodate(struct extent_io_tree *tree,