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 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
28 struct bio *bio, int mirror_num);
29 struct extent_io_ops {
30 int (*fill_delalloc)(struct inode *inode, u64 start, u64 end);
31 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
32 extent_submit_bio_hook_t *submit_bio_hook;
33 int (*merge_bio_hook)(struct page *page, unsigned long offset,
34 size_t size, struct bio *bio);
35 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
36 int (*readpage_io_failed_hook)(struct bio *bio, struct page *page,
38 struct extent_state *state);
39 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
40 struct extent_state *state);
41 void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
42 struct extent_state *state);
43 int (*set_bit_hook)(struct inode *inode, u64 start, u64 end,
44 unsigned long old, unsigned long bits);
45 int (*clear_bit_hook)(struct inode *inode, u64 start, u64 end,
46 unsigned long old, unsigned long bits);
49 struct extent_io_tree {
51 struct address_space *mapping;
54 struct extent_io_ops *ops;
56 struct list_head buffer_lru;
58 struct extent_state *last;
63 u64 end; /* inclusive */
64 struct rb_node rb_node;
65 struct extent_io_tree *tree;
70 /* for use by the FS */
73 struct list_head leak_list;
76 struct extent_buffer {
81 unsigned long map_start;
82 unsigned long map_len;
83 struct page *first_page;
87 struct list_head leak_list;
90 struct extent_map_tree;
92 static inline struct extent_state *extent_state_next(struct extent_state *state)
95 node = rb_next(&state->rb_node);
98 return rb_entry(node, struct extent_state, rb_node);
101 typedef struct extent_map *(get_extent_t)(struct inode *inode,
107 void extent_io_tree_init(struct extent_io_tree *tree,
108 struct address_space *mapping, gfp_t mask);
109 void extent_io_tree_empty_lru(struct extent_io_tree *tree);
110 int try_release_extent_mapping(struct extent_map_tree *map,
111 struct extent_io_tree *tree, struct page *page,
113 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
114 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
115 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
116 get_extent_t *get_extent);
117 int __init extent_io_init(void);
118 void extent_io_exit(void);
120 u64 count_range_bits(struct extent_io_tree *tree,
121 u64 *start, u64 search_end,
122 u64 max_bytes, unsigned long bits);
124 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
125 int bits, int filled);
126 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
127 int bits, gfp_t mask);
128 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
129 int bits, gfp_t mask);
130 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
132 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
134 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
136 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
138 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
140 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
141 u64 *start_ret, u64 *end_ret, int bits);
142 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
143 u64 start, int bits);
144 int extent_invalidatepage(struct extent_io_tree *tree,
145 struct page *page, unsigned long offset);
146 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
147 get_extent_t *get_extent,
148 struct writeback_control *wbc);
149 int extent_writepages(struct extent_io_tree *tree,
150 struct address_space *mapping,
151 get_extent_t *get_extent,
152 struct writeback_control *wbc);
153 int extent_readpages(struct extent_io_tree *tree,
154 struct address_space *mapping,
155 struct list_head *pages, unsigned nr_pages,
156 get_extent_t get_extent);
157 int extent_prepare_write(struct extent_io_tree *tree,
158 struct inode *inode, struct page *page,
159 unsigned from, unsigned to, get_extent_t *get_extent);
160 int extent_commit_write(struct extent_io_tree *tree,
161 struct inode *inode, struct page *page,
162 unsigned from, unsigned to);
163 sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
164 get_extent_t *get_extent);
165 int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
166 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
167 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
168 void set_page_extent_mapped(struct page *page);
170 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
171 u64 start, unsigned long len,
174 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
175 u64 start, unsigned long len,
177 void free_extent_buffer(struct extent_buffer *eb);
178 int read_extent_buffer_pages(struct extent_io_tree *tree,
179 struct extent_buffer *eb, u64 start, int wait,
180 get_extent_t *get_extent, int mirror_num);
182 static inline void extent_buffer_get(struct extent_buffer *eb)
184 atomic_inc(&eb->refs);
187 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
190 void read_extent_buffer(struct extent_buffer *eb, void *dst,
193 void write_extent_buffer(struct extent_buffer *eb, const void *src,
194 unsigned long start, unsigned long len);
195 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
196 unsigned long dst_offset, unsigned long src_offset,
198 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
199 unsigned long src_offset, unsigned long len);
200 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
201 unsigned long src_offset, unsigned long len);
202 void memset_extent_buffer(struct extent_buffer *eb, char c,
203 unsigned long start, unsigned long len);
204 int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
205 struct extent_buffer *eb);
206 int clear_extent_buffer_dirty(struct extent_io_tree *tree,
207 struct extent_buffer *eb);
208 int set_extent_buffer_dirty(struct extent_io_tree *tree,
209 struct extent_buffer *eb);
210 int set_extent_buffer_uptodate(struct extent_io_tree *tree,
211 struct extent_buffer *eb);
212 int extent_buffer_uptodate(struct extent_io_tree *tree,
213 struct extent_buffer *eb);
214 int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
215 unsigned long min_len, char **token, char **map,
216 unsigned long *map_start,
217 unsigned long *map_len, int km);
218 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
219 unsigned long min_len, char **token, char **map,
220 unsigned long *map_start,
221 unsigned long *map_len, int km);
222 void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
223 int invalidate_extent_lru(struct extent_io_tree *tree, u64 start,
225 int release_extent_buffer_tail_pages(struct extent_buffer *eb);
226 int extent_range_uptodate(struct extent_io_tree *tree,