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_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
23 struct extent_map_ops {
24 int (*fill_delalloc)(struct inode *inode, u64 start, u64 end);
25 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
26 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
27 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end);
28 void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end);
31 struct extent_map_tree {
34 struct address_space *mapping;
36 struct extent_map_ops *ops;
38 struct list_head buffer_lru;
42 /* note, this must start with the same fields as fs/extent_map.c:tree_entry */
45 u64 end; /* inclusive */
47 struct rb_node rb_node;
48 /* block_start and block_end are in bytes */
50 u64 block_end; /* inclusive */
51 struct block_device *bdev;
55 /* note, this must start with the same fields as fs/extent_map.c:tree_entry */
58 u64 end; /* inclusive */
60 struct rb_node rb_node;
65 /* for use by the FS */
68 struct list_head list;
71 struct extent_buffer {
76 unsigned long map_start;
77 unsigned long map_len;
78 struct page *last_page;
84 typedef struct extent_map *(get_extent_t)(struct inode *inode,
90 void extent_map_tree_init(struct extent_map_tree *tree,
91 struct address_space *mapping, gfp_t mask);
92 void extent_map_tree_cleanup(struct extent_map_tree *tree);
93 struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
95 int add_extent_mapping(struct extent_map_tree *tree,
96 struct extent_map *em);
97 int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
98 int try_release_extent_mapping(struct extent_map_tree *tree, struct page *page);
99 int lock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
100 int unlock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
101 struct extent_map *alloc_extent_map(gfp_t mask);
102 void free_extent_map(struct extent_map *em);
103 int extent_read_full_page(struct extent_map_tree *tree, struct page *page,
104 get_extent_t *get_extent);
105 void __init extent_map_init(void);
106 void __exit extent_map_exit(void);
108 int test_range_bit(struct extent_map_tree *tree, u64 start, u64 end,
109 int bits, int filled);
110 int clear_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
111 int bits, gfp_t mask);
112 int set_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
113 int bits, gfp_t mask);
114 int set_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end,
116 int set_extent_new(struct extent_map_tree *tree, u64 start, u64 end,
118 int set_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
120 int clear_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
122 int set_extent_delalloc(struct extent_map_tree *tree, u64 start, u64 end,
124 int find_first_extent_bit(struct extent_map_tree *tree, u64 start,
125 u64 *start_ret, u64 *end_ret, int bits);
126 int extent_invalidatepage(struct extent_map_tree *tree,
127 struct page *page, unsigned long offset);
128 int extent_write_full_page(struct extent_map_tree *tree, struct page *page,
129 get_extent_t *get_extent,
130 struct writeback_control *wbc);
131 int extent_prepare_write(struct extent_map_tree *tree,
132 struct inode *inode, struct page *page,
133 unsigned from, unsigned to, get_extent_t *get_extent);
134 int extent_commit_write(struct extent_map_tree *tree,
135 struct inode *inode, struct page *page,
136 unsigned from, unsigned to);
137 sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
138 get_extent_t *get_extent);
139 int set_range_dirty(struct extent_map_tree *tree, u64 start, u64 end);
140 int set_state_private(struct extent_map_tree *tree, u64 start, u64 private);
141 int get_state_private(struct extent_map_tree *tree, u64 start, u64 *private);
142 void set_page_extent_mapped(struct page *page);
144 struct extent_buffer *alloc_extent_buffer(struct extent_map_tree *tree,
145 u64 start, unsigned long len,
147 struct extent_buffer *find_extent_buffer(struct extent_map_tree *tree,
148 u64 start, unsigned long len,
150 void free_extent_buffer(struct extent_buffer *eb);
151 int read_extent_buffer_pages(struct extent_map_tree *tree,
152 struct extent_buffer *eb, int wait);
154 static inline void extent_buffer_get(struct extent_buffer *eb)
156 atomic_inc(&eb->refs);
159 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
162 void read_extent_buffer(struct extent_buffer *eb, void *dst,
165 void write_extent_buffer(struct extent_buffer *eb, const void *src,
166 unsigned long start, unsigned long len);
167 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
168 unsigned long dst_offset, unsigned long src_offset,
170 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
171 unsigned long src_offset, unsigned long len);
172 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
173 unsigned long src_offset, unsigned long len);
174 void memset_extent_buffer(struct extent_buffer *eb, char c,
175 unsigned long start, unsigned long len);
176 int wait_on_extent_buffer_writeback(struct extent_map_tree *tree,
177 struct extent_buffer *eb);
178 int clear_extent_buffer_dirty(struct extent_map_tree *tree,
179 struct extent_buffer *eb);
180 int set_extent_buffer_dirty(struct extent_map_tree *tree,
181 struct extent_buffer *eb);
182 int set_extent_buffer_uptodate(struct extent_map_tree *tree,
183 struct extent_buffer *eb);
184 int extent_buffer_uptodate(struct extent_map_tree *tree,
185 struct extent_buffer *eb);
186 int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
187 unsigned long min_len, char **token, char **map,
188 unsigned long *map_start,
189 unsigned long *map_len, int km);
190 void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);