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.
28 #define EXTENT_PAGE_PRIVATE 1
29 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
32 struct extent_map_ops {
33 int (*fill_delalloc)(struct inode *inode, u64 start, u64 end);
34 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
35 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
36 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end);
37 void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end);
40 struct extent_map_tree {
43 struct address_space *mapping;
45 struct extent_map_ops *ops;
47 struct list_head buffer_lru;
51 /* note, this must start with the same fields as fs/extent_map.c:tree_entry */
54 u64 end; /* inclusive */
56 struct rb_node rb_node;
57 /* block_start and block_end are in bytes */
59 u64 block_end; /* inclusive */
60 struct block_device *bdev;
64 /* note, this must start with the same fields as fs/extent_map.c:tree_entry */
67 u64 end; /* inclusive */
69 struct rb_node rb_node;
74 /* for use by the FS */
77 struct list_head list;
80 struct extent_buffer {
85 unsigned long map_start;
86 unsigned long map_len;
87 struct page *first_page;
93 typedef struct extent_map *(get_extent_t)(struct inode *inode,
99 void extent_map_tree_init(struct extent_map_tree *tree,
100 struct address_space *mapping, gfp_t mask);
101 void extent_map_tree_empty_lru(struct extent_map_tree *tree);
102 struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
104 int add_extent_mapping(struct extent_map_tree *tree,
105 struct extent_map *em);
106 int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
107 int try_release_extent_mapping(struct extent_map_tree *tree, struct page *page);
108 int lock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
109 int unlock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
110 struct extent_map *alloc_extent_map(gfp_t mask);
111 void free_extent_map(struct extent_map *em);
112 int extent_read_full_page(struct extent_map_tree *tree, struct page *page,
113 get_extent_t *get_extent);
114 void __init extent_map_init(void);
115 void __exit extent_map_exit(void);
117 int test_range_bit(struct extent_map_tree *tree, u64 start, u64 end,
118 int bits, int filled);
119 int clear_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
120 int bits, gfp_t mask);
121 int set_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
122 int bits, gfp_t mask);
123 int set_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end,
125 int set_extent_new(struct extent_map_tree *tree, u64 start, u64 end,
127 int set_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
129 int clear_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
131 int set_extent_delalloc(struct extent_map_tree *tree, u64 start, u64 end,
133 int find_first_extent_bit(struct extent_map_tree *tree, u64 start,
134 u64 *start_ret, u64 *end_ret, int bits);
135 int extent_invalidatepage(struct extent_map_tree *tree,
136 struct page *page, unsigned long offset);
137 int extent_write_full_page(struct extent_map_tree *tree, struct page *page,
138 get_extent_t *get_extent,
139 struct writeback_control *wbc);
140 int extent_prepare_write(struct extent_map_tree *tree,
141 struct inode *inode, struct page *page,
142 unsigned from, unsigned to, get_extent_t *get_extent);
143 int extent_commit_write(struct extent_map_tree *tree,
144 struct inode *inode, struct page *page,
145 unsigned from, unsigned to);
146 sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
147 get_extent_t *get_extent);
148 int set_range_dirty(struct extent_map_tree *tree, u64 start, u64 end);
149 int set_state_private(struct extent_map_tree *tree, u64 start, u64 private);
150 int get_state_private(struct extent_map_tree *tree, u64 start, u64 *private);
151 void set_page_extent_mapped(struct page *page);
153 struct extent_buffer *alloc_extent_buffer(struct extent_map_tree *tree,
154 u64 start, unsigned long len,
157 struct extent_buffer *find_extent_buffer(struct extent_map_tree *tree,
158 u64 start, unsigned long len,
160 void free_extent_buffer(struct extent_buffer *eb);
161 int read_extent_buffer_pages(struct extent_map_tree *tree,
162 struct extent_buffer *eb, u64 start, int wait);
164 static inline void extent_buffer_get(struct extent_buffer *eb)
166 atomic_inc(&eb->refs);
169 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
172 void read_extent_buffer(struct extent_buffer *eb, void *dst,
175 void write_extent_buffer(struct extent_buffer *eb, const void *src,
176 unsigned long start, unsigned long len);
177 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
178 unsigned long dst_offset, unsigned long src_offset,
180 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
181 unsigned long src_offset, unsigned long len);
182 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
183 unsigned long src_offset, unsigned long len);
184 void memset_extent_buffer(struct extent_buffer *eb, char c,
185 unsigned long start, unsigned long len);
186 int wait_on_extent_buffer_writeback(struct extent_map_tree *tree,
187 struct extent_buffer *eb);
188 int clear_extent_buffer_dirty(struct extent_map_tree *tree,
189 struct extent_buffer *eb);
190 int set_extent_buffer_dirty(struct extent_map_tree *tree,
191 struct extent_buffer *eb);
192 int set_extent_buffer_uptodate(struct extent_map_tree *tree,
193 struct extent_buffer *eb);
194 int extent_buffer_uptodate(struct extent_map_tree *tree,
195 struct extent_buffer *eb);
196 int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
197 unsigned long min_len, char **token, char **map,
198 unsigned long *map_start,
199 unsigned long *map_len, int km);
200 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
201 unsigned long min_len, char **token, char **map,
202 unsigned long *map_start,
203 unsigned long *map_len, int km);
204 void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);