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_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
20 struct extent_map_ops {
21 int (*fill_delalloc)(struct inode *inode, u64 start, u64 end);
22 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
23 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
24 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end);
25 void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end);
28 struct extent_map_tree {
31 struct address_space *mapping;
33 struct extent_map_ops *ops;
36 /* note, this must start with the same fields as fs/extent_map.c:tree_entry */
39 u64 end; /* inclusive */
41 struct rb_node rb_node;
42 /* block_start and block_end are in bytes */
44 u64 block_end; /* inclusive */
45 struct block_device *bdev;
49 /* note, this must start with the same fields as fs/extent_map.c:tree_entry */
52 u64 end; /* inclusive */
54 struct rb_node rb_node;
59 /* for use by the FS */
62 struct list_head list;
65 struct extent_buffer {
70 struct list_head list;
71 struct list_head leak_list;
72 struct page *first_page;
73 struct page *last_page;
74 unsigned long alloc_addr;
77 unsigned long map_start;
78 unsigned long map_len;
81 typedef struct extent_map *(get_extent_t)(struct inode *inode,
87 void extent_map_tree_init(struct extent_map_tree *tree,
88 struct address_space *mapping, gfp_t mask);
89 struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
91 int add_extent_mapping(struct extent_map_tree *tree,
92 struct extent_map *em);
93 int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
94 int try_release_extent_mapping(struct extent_map_tree *tree, struct page *page);
95 int lock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
96 int unlock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
97 struct extent_map *alloc_extent_map(gfp_t mask);
98 void free_extent_map(struct extent_map *em);
99 int extent_read_full_page(struct extent_map_tree *tree, struct page *page,
100 get_extent_t *get_extent);
101 void __init extent_map_init(void);
102 void __exit extent_map_exit(void);
104 int test_range_bit(struct extent_map_tree *tree, u64 start, u64 end,
105 int bits, int filled);
106 int clear_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
107 int bits, gfp_t mask);
108 int set_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
109 int bits, gfp_t mask);
110 int set_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end,
112 int set_extent_new(struct extent_map_tree *tree, u64 start, u64 end,
114 int set_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
116 int clear_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
118 int set_extent_delalloc(struct extent_map_tree *tree, u64 start, u64 end,
120 int find_first_extent_bit(struct extent_map_tree *tree, u64 start,
121 u64 *start_ret, u64 *end_ret, int bits);
122 int extent_invalidatepage(struct extent_map_tree *tree,
123 struct page *page, unsigned long offset);
124 int extent_write_full_page(struct extent_map_tree *tree, struct page *page,
125 get_extent_t *get_extent,
126 struct writeback_control *wbc);
127 int extent_prepare_write(struct extent_map_tree *tree,
128 struct inode *inode, struct page *page,
129 unsigned from, unsigned to, get_extent_t *get_extent);
130 int extent_commit_write(struct extent_map_tree *tree,
131 struct inode *inode, struct page *page,
132 unsigned from, unsigned to);
133 sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
134 get_extent_t *get_extent);
135 int set_range_dirty(struct extent_map_tree *tree, u64 start, u64 end);
136 int set_state_private(struct extent_map_tree *tree, u64 start, u64 private);
137 int get_state_private(struct extent_map_tree *tree, u64 start, u64 *private);
138 void set_page_extent_mapped(struct page *page);
140 struct extent_buffer *alloc_extent_buffer(struct extent_map_tree *tree,
141 u64 start, unsigned long len,
143 struct extent_buffer *find_extent_buffer(struct extent_map_tree *tree,
144 u64 start, unsigned long len,
146 void free_extent_buffer(struct extent_buffer *eb);
147 int read_extent_buffer_pages(struct extent_map_tree *tree,
148 struct extent_buffer *eb, int wait);
150 static inline void extent_buffer_get(struct extent_buffer *eb)
152 atomic_inc(&eb->refs);
155 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
158 void read_extent_buffer(struct extent_buffer *eb, void *dst,
161 void write_extent_buffer(struct extent_buffer *eb, const void *src,
162 unsigned long start, unsigned long len);
163 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
164 unsigned long dst_offset, unsigned long src_offset,
166 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
167 unsigned long src_offset, unsigned long len);
168 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
169 unsigned long src_offset, unsigned long len);
170 void memset_extent_buffer(struct extent_buffer *eb, char c,
171 unsigned long start, unsigned long len);
172 int wait_on_extent_buffer_writeback(struct extent_map_tree *tree,
173 struct extent_buffer *eb);
174 int clear_extent_buffer_dirty(struct extent_map_tree *tree,
175 struct extent_buffer *eb);
176 int set_extent_buffer_dirty(struct extent_map_tree *tree,
177 struct extent_buffer *eb);
178 int set_extent_buffer_uptodate(struct extent_map_tree *tree,
179 struct extent_buffer *eb);
180 int extent_buffer_uptodate(struct extent_map_tree *tree,
181 struct extent_buffer *eb);
182 int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
183 unsigned long min_len, char **token, char **map,
184 unsigned long *map_start,
185 unsigned long *map_len, int km);
186 void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);