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_CSUM (1 << 9)
17 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
20 * page->private values. Every page that is controlled by the extent
21 * map has page->private set to one.
23 #define EXTENT_PAGE_PRIVATE 1
24 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
28 struct extent_io_ops {
29 int (*fill_delalloc)(struct inode *inode, u64 start, u64 end);
30 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
31 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
32 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
33 struct extent_state *state);
34 void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
35 struct extent_state *state);
38 struct extent_io_tree {
40 struct address_space *mapping;
43 struct extent_io_ops *ops;
45 struct list_head buffer_lru;
51 u64 end; /* inclusive */
52 struct rb_node rb_node;
53 struct extent_io_tree *tree;
58 /* for use by the FS */
61 struct list_head list;
64 struct extent_buffer {
69 unsigned long map_start;
70 unsigned long map_len;
71 struct page *first_page;
77 struct extent_map_tree;
79 typedef struct extent_map *(get_extent_t)(struct inode *inode,
85 void extent_io_tree_init(struct extent_io_tree *tree,
86 struct address_space *mapping, gfp_t mask);
87 void extent_io_tree_empty_lru(struct extent_io_tree *tree);
88 int try_release_extent_mapping(struct extent_map_tree *map,
89 struct extent_io_tree *tree, struct page *page,
91 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
92 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
93 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
94 get_extent_t *get_extent);
95 int __init extent_io_init(void);
96 void extent_io_exit(void);
98 u64 count_range_bits(struct extent_io_tree *tree,
99 u64 *start, u64 search_end,
100 u64 max_bytes, unsigned long bits);
102 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
103 int bits, int filled);
104 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
105 int bits, gfp_t mask);
106 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
107 int bits, gfp_t mask);
108 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
110 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
112 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
114 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
116 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
118 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
119 u64 *start_ret, u64 *end_ret, int bits);
120 int extent_invalidatepage(struct extent_io_tree *tree,
121 struct page *page, unsigned long offset);
122 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
123 get_extent_t *get_extent,
124 struct writeback_control *wbc);
125 int extent_writepages(struct extent_io_tree *tree,
126 struct address_space *mapping,
127 get_extent_t *get_extent,
128 struct writeback_control *wbc);
129 int extent_readpages(struct extent_io_tree *tree,
130 struct address_space *mapping,
131 struct list_head *pages, unsigned nr_pages,
132 get_extent_t get_extent);
133 int extent_prepare_write(struct extent_io_tree *tree,
134 struct inode *inode, struct page *page,
135 unsigned from, unsigned to, get_extent_t *get_extent);
136 int extent_commit_write(struct extent_io_tree *tree,
137 struct inode *inode, struct page *page,
138 unsigned from, unsigned to);
139 sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
140 get_extent_t *get_extent);
141 int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
142 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
143 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
144 void set_page_extent_mapped(struct page *page);
146 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
147 u64 start, unsigned long len,
150 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
151 u64 start, unsigned long len,
153 void free_extent_buffer(struct extent_buffer *eb);
154 int read_extent_buffer_pages(struct extent_io_tree *tree,
155 struct extent_buffer *eb, u64 start, int wait);
157 static inline void extent_buffer_get(struct extent_buffer *eb)
159 atomic_inc(&eb->refs);
162 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
165 void read_extent_buffer(struct extent_buffer *eb, void *dst,
168 void write_extent_buffer(struct extent_buffer *eb, const void *src,
169 unsigned long start, unsigned long len);
170 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
171 unsigned long dst_offset, unsigned long src_offset,
173 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
174 unsigned long src_offset, unsigned long len);
175 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
176 unsigned long src_offset, unsigned long len);
177 void memset_extent_buffer(struct extent_buffer *eb, char c,
178 unsigned long start, unsigned long len);
179 int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
180 struct extent_buffer *eb);
181 int clear_extent_buffer_dirty(struct extent_io_tree *tree,
182 struct extent_buffer *eb);
183 int set_extent_buffer_dirty(struct extent_io_tree *tree,
184 struct extent_buffer *eb);
185 int set_extent_buffer_uptodate(struct extent_io_tree *tree,
186 struct extent_buffer *eb);
187 int extent_buffer_uptodate(struct extent_io_tree *tree,
188 struct extent_buffer *eb);
189 int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
190 unsigned long min_len, char **token, char **map,
191 unsigned long *map_start,
192 unsigned long *map_len, int km);
193 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
194 unsigned long min_len, char **token, char **map,
195 unsigned long *map_start,
196 unsigned long *map_len, int km);
197 void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);