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
26 struct extent_io_ops {
27 int (*fill_delalloc)(struct inode *inode, u64 start, u64 end);
28 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
29 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
30 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end);
31 void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end);
34 struct extent_io_tree {
36 struct address_space *mapping;
39 struct extent_io_ops *ops;
41 struct list_head buffer_lru;
47 u64 end; /* inclusive */
49 struct rb_node rb_node;
54 /* for use by the FS */
57 struct list_head list;
60 struct extent_buffer {
65 unsigned long map_start;
66 unsigned long map_len;
67 struct page *first_page;
73 struct extent_map_tree;
75 typedef struct extent_map *(get_extent_t)(struct inode *inode,
81 void extent_io_tree_init(struct extent_io_tree *tree,
82 struct address_space *mapping, gfp_t mask);
83 void extent_io_tree_empty_lru(struct extent_io_tree *tree);
84 int try_release_extent_mapping(struct extent_map_tree *map,
85 struct extent_io_tree *tree, struct page *page);
86 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
87 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
88 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
89 get_extent_t *get_extent);
90 int __init extent_io_init(void);
91 void extent_io_exit(void);
93 u64 count_range_bits(struct extent_io_tree *tree,
94 u64 *start, u64 search_end,
95 u64 max_bytes, unsigned long bits);
97 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
98 int bits, int filled);
99 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
100 int bits, gfp_t mask);
101 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
102 int bits, gfp_t mask);
103 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
105 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
107 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
109 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
111 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
113 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
114 u64 *start_ret, u64 *end_ret, int bits);
115 int extent_invalidatepage(struct extent_io_tree *tree,
116 struct page *page, unsigned long offset);
117 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
118 get_extent_t *get_extent,
119 struct writeback_control *wbc);
120 int extent_writepages(struct extent_io_tree *tree,
121 struct address_space *mapping,
122 get_extent_t *get_extent,
123 struct writeback_control *wbc);
124 int extent_readpages(struct extent_io_tree *tree,
125 struct address_space *mapping,
126 struct list_head *pages, unsigned nr_pages,
127 get_extent_t get_extent);
128 int extent_prepare_write(struct extent_io_tree *tree,
129 struct inode *inode, struct page *page,
130 unsigned from, unsigned to, get_extent_t *get_extent);
131 int extent_commit_write(struct extent_io_tree *tree,
132 struct inode *inode, struct page *page,
133 unsigned from, unsigned to);
134 sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
135 get_extent_t *get_extent);
136 int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
137 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
138 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
139 void set_page_extent_mapped(struct page *page);
141 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
142 u64 start, unsigned long len,
145 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
146 u64 start, unsigned long len,
148 void free_extent_buffer(struct extent_buffer *eb);
149 int read_extent_buffer_pages(struct extent_io_tree *tree,
150 struct extent_buffer *eb, u64 start, int wait);
152 static inline void extent_buffer_get(struct extent_buffer *eb)
154 atomic_inc(&eb->refs);
157 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
160 void read_extent_buffer(struct extent_buffer *eb, void *dst,
163 void write_extent_buffer(struct extent_buffer *eb, const void *src,
164 unsigned long start, unsigned long len);
165 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
166 unsigned long dst_offset, unsigned long src_offset,
168 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
169 unsigned long src_offset, unsigned long len);
170 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
171 unsigned long src_offset, unsigned long len);
172 void memset_extent_buffer(struct extent_buffer *eb, char c,
173 unsigned long start, unsigned long len);
174 int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
175 struct extent_buffer *eb);
176 int clear_extent_buffer_dirty(struct extent_io_tree *tree,
177 struct extent_buffer *eb);
178 int set_extent_buffer_dirty(struct extent_io_tree *tree,
179 struct extent_buffer *eb);
180 int set_extent_buffer_uptodate(struct extent_io_tree *tree,
181 struct extent_buffer *eb);
182 int extent_buffer_uptodate(struct extent_io_tree *tree,
183 struct extent_buffer *eb);
184 int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
185 unsigned long min_len, char **token, char **map,
186 unsigned long *map_start,
187 unsigned long *map_len, int km);
188 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
189 unsigned long min_len, char **token, char **map,
190 unsigned long *map_start,
191 unsigned long *map_len, int km);
192 void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);