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;
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 int __init extent_map_init(void);
115 void __exit extent_map_exit(void);
117 u64 count_range_bits(struct extent_map_tree *tree,
118 u64 *start, u64 max_bytes, unsigned long bits);
120 int test_range_bit(struct extent_map_tree *tree, u64 start, u64 end,
121 int bits, int filled);
122 int clear_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
123 int bits, gfp_t mask);
124 int set_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
125 int bits, gfp_t mask);
126 int set_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end,
128 int set_extent_new(struct extent_map_tree *tree, u64 start, u64 end,
130 int set_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
132 int clear_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
134 int set_extent_delalloc(struct extent_map_tree *tree, u64 start, u64 end,
136 int find_first_extent_bit(struct extent_map_tree *tree, u64 start,
137 u64 *start_ret, u64 *end_ret, int bits);
138 int extent_invalidatepage(struct extent_map_tree *tree,
139 struct page *page, unsigned long offset);
140 int extent_write_full_page(struct extent_map_tree *tree, struct page *page,
141 get_extent_t *get_extent,
142 struct writeback_control *wbc);
143 int extent_writepages(struct extent_map_tree *tree,
144 struct address_space *mapping,
145 get_extent_t *get_extent,
146 struct writeback_control *wbc);
147 int extent_readpages(struct extent_map_tree *tree,
148 struct address_space *mapping,
149 struct list_head *pages, unsigned nr_pages,
150 get_extent_t get_extent);
151 int extent_prepare_write(struct extent_map_tree *tree,
152 struct inode *inode, struct page *page,
153 unsigned from, unsigned to, get_extent_t *get_extent);
154 int extent_commit_write(struct extent_map_tree *tree,
155 struct inode *inode, struct page *page,
156 unsigned from, unsigned to);
157 sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
158 get_extent_t *get_extent);
159 int set_range_dirty(struct extent_map_tree *tree, u64 start, u64 end);
160 int set_state_private(struct extent_map_tree *tree, u64 start, u64 private);
161 int get_state_private(struct extent_map_tree *tree, u64 start, u64 *private);
162 void set_page_extent_mapped(struct page *page);
164 struct extent_buffer *alloc_extent_buffer(struct extent_map_tree *tree,
165 u64 start, unsigned long len,
168 struct extent_buffer *find_extent_buffer(struct extent_map_tree *tree,
169 u64 start, unsigned long len,
171 void free_extent_buffer(struct extent_buffer *eb);
172 int read_extent_buffer_pages(struct extent_map_tree *tree,
173 struct extent_buffer *eb, u64 start, int wait);
175 static inline void extent_buffer_get(struct extent_buffer *eb)
177 atomic_inc(&eb->refs);
180 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
183 void read_extent_buffer(struct extent_buffer *eb, void *dst,
186 void write_extent_buffer(struct extent_buffer *eb, const void *src,
187 unsigned long start, unsigned long len);
188 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
189 unsigned long dst_offset, unsigned long src_offset,
191 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
192 unsigned long src_offset, unsigned long len);
193 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
194 unsigned long src_offset, unsigned long len);
195 void memset_extent_buffer(struct extent_buffer *eb, char c,
196 unsigned long start, unsigned long len);
197 int wait_on_extent_buffer_writeback(struct extent_map_tree *tree,
198 struct extent_buffer *eb);
199 int clear_extent_buffer_dirty(struct extent_map_tree *tree,
200 struct extent_buffer *eb);
201 int set_extent_buffer_dirty(struct extent_map_tree *tree,
202 struct extent_buffer *eb);
203 int set_extent_buffer_uptodate(struct extent_map_tree *tree,
204 struct extent_buffer *eb);
205 int extent_buffer_uptodate(struct extent_map_tree *tree,
206 struct extent_buffer *eb);
207 int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
208 unsigned long min_len, char **token, char **map,
209 unsigned long *map_start,
210 unsigned long *map_len, int km);
211 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
212 unsigned long min_len, char **token, char **map,
213 unsigned long *map_start,
214 unsigned long *map_len, int km);
215 void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);