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 unsigned long alloc_addr;
76 typedef struct extent_map *(get_extent_t)(struct inode *inode,
82 void extent_map_tree_init(struct extent_map_tree *tree,
83 struct address_space *mapping, gfp_t mask);
84 struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
86 int add_extent_mapping(struct extent_map_tree *tree,
87 struct extent_map *em);
88 int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
89 int try_release_extent_mapping(struct extent_map_tree *tree, struct page *page);
90 int lock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
91 int unlock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
92 struct extent_map *alloc_extent_map(gfp_t mask);
93 void free_extent_map(struct extent_map *em);
94 int extent_read_full_page(struct extent_map_tree *tree, struct page *page,
95 get_extent_t *get_extent);
96 void __init extent_map_init(void);
97 void __exit extent_map_exit(void);
98 int extent_clean_all_trees(struct extent_map_tree *tree);
99 int set_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end,
101 int set_extent_new(struct extent_map_tree *tree, u64 start, u64 end,
103 int set_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
105 int clear_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
107 int set_extent_delalloc(struct extent_map_tree *tree, u64 start, u64 end,
109 int find_first_extent_bit(struct extent_map_tree *tree, u64 start,
110 u64 *start_ret, u64 *end_ret, int bits);
111 int extent_invalidatepage(struct extent_map_tree *tree,
112 struct page *page, unsigned long offset);
113 int extent_write_full_page(struct extent_map_tree *tree, struct page *page,
114 get_extent_t *get_extent,
115 struct writeback_control *wbc);
116 int extent_prepare_write(struct extent_map_tree *tree,
117 struct inode *inode, struct page *page,
118 unsigned from, unsigned to, get_extent_t *get_extent);
119 int extent_commit_write(struct extent_map_tree *tree,
120 struct inode *inode, struct page *page,
121 unsigned from, unsigned to);
122 sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
123 get_extent_t *get_extent);
124 int set_range_dirty(struct extent_map_tree *tree, u64 start, u64 end);
125 int set_state_private(struct extent_map_tree *tree, u64 start, u64 private);
126 int get_state_private(struct extent_map_tree *tree, u64 start, u64 *private);
127 void set_page_extent_mapped(struct page *page);
129 struct extent_buffer *alloc_extent_buffer(struct extent_map_tree *tree,
130 u64 start, unsigned long len,
132 struct extent_buffer *find_extent_buffer(struct extent_map_tree *tree,
133 u64 start, unsigned long len,
135 void free_extent_buffer(struct extent_buffer *eb);
136 int read_extent_buffer_pages(struct extent_map_tree *tree,
137 struct extent_buffer *eb, int wait);
139 static inline void extent_buffer_get(struct extent_buffer *eb)
141 atomic_inc(&eb->refs);
144 static inline u64 extent_buffer_blocknr(struct extent_buffer *eb)
146 return eb->start / 4096;
149 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
152 void read_extent_buffer(struct extent_buffer *eb, void *dst,
155 void write_extent_buffer(struct extent_buffer *eb, const void *src,
156 unsigned long start, unsigned long len);
157 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
158 unsigned long dst_offset, unsigned long src_offset,
160 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
161 unsigned long src_offset, unsigned long len);
162 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
163 unsigned long src_offset, unsigned long len);
164 void memset_extent_buffer(struct extent_buffer *eb, char c,
165 unsigned long start, unsigned long len);
166 int wait_on_extent_buffer_writeback(struct extent_map_tree *tree,
167 struct extent_buffer *eb);
168 int clear_extent_buffer_dirty(struct extent_map_tree *tree,
169 struct extent_buffer *eb);
170 int set_extent_buffer_dirty(struct extent_map_tree *tree,
171 struct extent_buffer *eb);
172 int set_extent_buffer_uptodate(struct extent_map_tree *tree,
173 struct extent_buffer *eb);
174 int extent_buffer_uptodate(struct extent_map_tree *tree,
175 struct extent_buffer *eb);
176 int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
177 unsigned long min_len, char **token, char **map,
178 unsigned long *map_start,
179 unsigned long *map_len, int km);
180 void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);