4 #include <linux/rbtree.h>
6 #define EXTENT_MAP_HOLE (u64)-3
7 #define EXTENT_MAP_INLINE (u64)-2
8 #define EXTENT_MAP_DELALLOC (u64)-1
10 /* bits for the extent state */
11 #define EXTENT_DIRTY 1
12 #define EXTENT_WRITEBACK (1 << 1)
13 #define EXTENT_UPTODATE (1 << 2)
14 #define EXTENT_LOCKED (1 << 3)
15 #define EXTENT_NEW (1 << 4)
16 #define EXTENT_DELALLOC (1 << 5)
17 #define EXTENT_DEFRAG (1 << 6)
18 #define EXTENT_DEFRAG_DONE (1 << 7)
19 #define EXTENT_BUFFER_FILLED (1 << 8)
20 #define EXTENT_CSUM (1 << 9)
21 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
24 * page->private values. Every page that is controlled by the extent
25 * map has page->private set to one.
27 #define EXTENT_PAGE_PRIVATE 1
28 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
31 struct extent_map_ops {
32 int (*fill_delalloc)(struct inode *inode, u64 start, u64 end);
33 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
34 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
35 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end);
36 void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end);
39 struct extent_map_tree {
42 struct address_space *mapping;
44 struct extent_map_ops *ops;
46 struct list_head buffer_lru;
50 /* note, this must start with the same fields as fs/extent_map.c:tree_entry */
53 u64 end; /* inclusive */
55 struct rb_node rb_node;
56 /* block_start and block_end are in bytes */
58 u64 block_end; /* inclusive */
59 struct block_device *bdev;
63 /* note, this must start with the same fields as fs/extent_map.c:tree_entry */
66 u64 end; /* inclusive */
68 struct rb_node rb_node;
73 /* for use by the FS */
76 struct list_head list;
79 struct extent_buffer {
84 unsigned long map_start;
85 unsigned long map_len;
86 struct page *first_page;
92 typedef struct extent_map *(get_extent_t)(struct inode *inode,
98 void extent_map_tree_init(struct extent_map_tree *tree,
99 struct address_space *mapping, gfp_t mask);
100 void extent_map_tree_empty_lru(struct extent_map_tree *tree);
101 struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
103 int add_extent_mapping(struct extent_map_tree *tree,
104 struct extent_map *em);
105 int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
106 int try_release_extent_mapping(struct extent_map_tree *tree, struct page *page);
107 int lock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
108 int unlock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
109 struct extent_map *alloc_extent_map(gfp_t mask);
110 void free_extent_map(struct extent_map *em);
111 int extent_read_full_page(struct extent_map_tree *tree, struct page *page,
112 get_extent_t *get_extent);
113 int __init extent_map_init(void);
114 void __exit extent_map_exit(void);
116 u64 count_range_bits(struct extent_map_tree *tree,
117 u64 *start, u64 max_bytes, unsigned long bits);
119 int test_range_bit(struct extent_map_tree *tree, u64 start, u64 end,
120 int bits, int filled);
121 int clear_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
122 int bits, gfp_t mask);
123 int set_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
124 int bits, gfp_t mask);
125 int set_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end,
127 int set_extent_new(struct extent_map_tree *tree, u64 start, u64 end,
129 int set_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
131 int clear_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
133 int set_extent_delalloc(struct extent_map_tree *tree, u64 start, u64 end,
135 int find_first_extent_bit(struct extent_map_tree *tree, u64 start,
136 u64 *start_ret, u64 *end_ret, int bits);
137 int extent_invalidatepage(struct extent_map_tree *tree,
138 struct page *page, unsigned long offset);
139 int extent_write_full_page(struct extent_map_tree *tree, struct page *page,
140 get_extent_t *get_extent,
141 struct writeback_control *wbc);
142 int extent_writepages(struct extent_map_tree *tree,
143 struct address_space *mapping,
144 get_extent_t *get_extent,
145 struct writeback_control *wbc);
146 int extent_readpages(struct extent_map_tree *tree,
147 struct address_space *mapping,
148 struct list_head *pages, unsigned nr_pages,
149 get_extent_t get_extent);
150 int extent_prepare_write(struct extent_map_tree *tree,
151 struct inode *inode, struct page *page,
152 unsigned from, unsigned to, get_extent_t *get_extent);
153 int extent_commit_write(struct extent_map_tree *tree,
154 struct inode *inode, struct page *page,
155 unsigned from, unsigned to);
156 sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
157 get_extent_t *get_extent);
158 int set_range_dirty(struct extent_map_tree *tree, u64 start, u64 end);
159 int set_state_private(struct extent_map_tree *tree, u64 start, u64 private);
160 int get_state_private(struct extent_map_tree *tree, u64 start, u64 *private);
161 void set_page_extent_mapped(struct page *page);
163 struct extent_buffer *alloc_extent_buffer(struct extent_map_tree *tree,
164 u64 start, unsigned long len,
167 struct extent_buffer *find_extent_buffer(struct extent_map_tree *tree,
168 u64 start, unsigned long len,
170 void free_extent_buffer(struct extent_buffer *eb);
171 int read_extent_buffer_pages(struct extent_map_tree *tree,
172 struct extent_buffer *eb, u64 start, int wait);
174 static inline void extent_buffer_get(struct extent_buffer *eb)
176 atomic_inc(&eb->refs);
179 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
182 void read_extent_buffer(struct extent_buffer *eb, void *dst,
185 void write_extent_buffer(struct extent_buffer *eb, const void *src,
186 unsigned long start, unsigned long len);
187 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
188 unsigned long dst_offset, unsigned long src_offset,
190 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
191 unsigned long src_offset, unsigned long len);
192 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
193 unsigned long src_offset, unsigned long len);
194 void memset_extent_buffer(struct extent_buffer *eb, char c,
195 unsigned long start, unsigned long len);
196 int wait_on_extent_buffer_writeback(struct extent_map_tree *tree,
197 struct extent_buffer *eb);
198 int clear_extent_buffer_dirty(struct extent_map_tree *tree,
199 struct extent_buffer *eb);
200 int set_extent_buffer_dirty(struct extent_map_tree *tree,
201 struct extent_buffer *eb);
202 int set_extent_buffer_uptodate(struct extent_map_tree *tree,
203 struct extent_buffer *eb);
204 int extent_buffer_uptodate(struct extent_map_tree *tree,
205 struct extent_buffer *eb);
206 int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
207 unsigned long min_len, char **token, char **map,
208 unsigned long *map_start,
209 unsigned long *map_len, int km);
210 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
211 unsigned long min_len, char **token, char **map,
212 unsigned long *map_start,
213 unsigned long *map_len, int km);
214 void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);