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 #define EXTENT_BUFFER_SIZE(nr) (sizeof(struct extent_buffer) + \
66 (nr - 1) * sizeof(struct page *))
67 struct extent_buffer {
75 typedef struct extent_map *(get_extent_t)(struct inode *inode,
81 void extent_map_tree_init(struct extent_map_tree *tree,
82 struct address_space *mapping, gfp_t mask);
83 struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
85 int add_extent_mapping(struct extent_map_tree *tree,
86 struct extent_map *em);
87 int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
88 int try_release_extent_mapping(struct extent_map_tree *tree, struct page *page);
89 int lock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
90 int unlock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
91 struct extent_map *alloc_extent_map(gfp_t mask);
92 void free_extent_map(struct extent_map *em);
93 int extent_read_full_page(struct extent_map_tree *tree, struct page *page,
94 get_extent_t *get_extent);
95 void __init extent_map_init(void);
96 void __exit extent_map_exit(void);
97 int extent_clean_all_trees(struct extent_map_tree *tree);
98 int set_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end,
100 int set_extent_new(struct extent_map_tree *tree, u64 start, u64 end,
102 int set_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
104 int clear_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
106 int set_extent_delalloc(struct extent_map_tree *tree, u64 start, u64 end,
108 int find_first_extent_bit(struct extent_map_tree *tree, u64 start,
109 u64 *start_ret, u64 *end_ret, int bits);
110 int extent_invalidatepage(struct extent_map_tree *tree,
111 struct page *page, unsigned long offset);
112 int extent_write_full_page(struct extent_map_tree *tree, struct page *page,
113 get_extent_t *get_extent,
114 struct writeback_control *wbc);
115 int extent_prepare_write(struct extent_map_tree *tree,
116 struct inode *inode, struct page *page,
117 unsigned from, unsigned to, get_extent_t *get_extent);
118 int extent_commit_write(struct extent_map_tree *tree,
119 struct inode *inode, struct page *page,
120 unsigned from, unsigned to);
121 sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
122 get_extent_t *get_extent);
123 int set_range_dirty(struct extent_map_tree *tree, u64 start, u64 end);
124 int set_state_private(struct extent_map_tree *tree, u64 start, u64 private);
125 int get_state_private(struct extent_map_tree *tree, u64 start, u64 *private);
126 void set_page_extent_mapped(struct page *page);
128 struct extent_buffer *alloc_extent_buffer(struct extent_map_tree *tree,
129 u64 start, unsigned long len,
131 struct extent_buffer *find_extent_buffer(struct extent_map_tree *tree,
132 u64 start, unsigned long len,
134 void free_extent_buffer(struct extent_buffer *eb);
135 int read_extent_buffer_pages(struct extent_map_tree *tree,
136 struct extent_buffer *eb, int wait);
138 static inline void extent_buffer_get(struct extent_buffer *eb)
140 atomic_inc(&eb->refs);
143 static inline u64 extent_buffer_blocknr(struct extent_buffer *eb)
145 return eb->start / 4096;
148 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
151 void read_extent_buffer(struct extent_buffer *eb, void *dst,
154 void write_extent_buffer(struct extent_buffer *eb, const void *src,
155 unsigned long start, unsigned long len);
156 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
157 unsigned long dst_offset, unsigned long src_offset,
159 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
160 unsigned long src_offset, unsigned long len);
161 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
162 unsigned long src_offset, unsigned long len);
163 void memset_extent_buffer(struct extent_buffer *eb, char c,
164 unsigned long start, unsigned long len);
165 int wait_on_extent_buffer_writeback(struct extent_map_tree *tree,
166 struct extent_buffer *eb);
167 int clear_extent_buffer_dirty(struct extent_map_tree *tree,
168 struct extent_buffer *eb);
169 int set_extent_buffer_dirty(struct extent_map_tree *tree,
170 struct extent_buffer *eb);
171 int set_extent_buffer_uptodate(struct extent_map_tree *tree,
172 struct extent_buffer *eb);
173 int extent_buffer_uptodate(struct extent_map_tree *tree,
174 struct extent_buffer *eb);
175 int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
176 char **token, char **map,
177 unsigned long *map_start,
178 unsigned long *map_len, int km);
179 void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);