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_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
22 struct extent_map_ops {
23 int (*fill_delalloc)(struct inode *inode, u64 start, u64 end);
24 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
25 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
26 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end);
27 void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end);
30 struct extent_map_tree {
33 struct address_space *mapping;
35 struct extent_map_ops *ops;
38 /* note, this must start with the same fields as fs/extent_map.c:tree_entry */
41 u64 end; /* inclusive */
43 struct rb_node rb_node;
44 /* block_start and block_end are in bytes */
46 u64 block_end; /* inclusive */
47 struct block_device *bdev;
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;
61 /* for use by the FS */
64 struct list_head list;
67 #define EXTENT_INLINE_PAGES 32
68 struct extent_buffer {
73 struct list_head list;
74 struct list_head leak_list;
75 unsigned long alloc_addr;
78 unsigned long map_start;
79 unsigned long map_len;
80 struct page *pages[EXTENT_INLINE_PAGES];
83 typedef struct extent_map *(get_extent_t)(struct inode *inode,
89 void extent_map_tree_init(struct extent_map_tree *tree,
90 struct address_space *mapping, gfp_t mask);
91 struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
93 int add_extent_mapping(struct extent_map_tree *tree,
94 struct extent_map *em);
95 int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
96 int try_release_extent_mapping(struct extent_map_tree *tree, struct page *page);
97 int lock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
98 int unlock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
99 struct extent_map *alloc_extent_map(gfp_t mask);
100 void free_extent_map(struct extent_map *em);
101 int extent_read_full_page(struct extent_map_tree *tree, struct page *page,
102 get_extent_t *get_extent);
103 void __init extent_map_init(void);
104 void __exit extent_map_exit(void);
106 int test_range_bit(struct extent_map_tree *tree, u64 start, u64 end,
107 int bits, int filled);
108 int clear_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
109 int bits, gfp_t mask);
110 int set_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
111 int bits, gfp_t mask);
112 int set_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end,
114 int set_extent_new(struct extent_map_tree *tree, u64 start, u64 end,
116 int set_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
118 int clear_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
120 int set_extent_delalloc(struct extent_map_tree *tree, u64 start, u64 end,
122 int find_first_extent_bit(struct extent_map_tree *tree, u64 start,
123 u64 *start_ret, u64 *end_ret, int bits);
124 int extent_invalidatepage(struct extent_map_tree *tree,
125 struct page *page, unsigned long offset);
126 int extent_write_full_page(struct extent_map_tree *tree, struct page *page,
127 get_extent_t *get_extent,
128 struct writeback_control *wbc);
129 int extent_prepare_write(struct extent_map_tree *tree,
130 struct inode *inode, struct page *page,
131 unsigned from, unsigned to, get_extent_t *get_extent);
132 int extent_commit_write(struct extent_map_tree *tree,
133 struct inode *inode, struct page *page,
134 unsigned from, unsigned to);
135 sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
136 get_extent_t *get_extent);
137 int set_range_dirty(struct extent_map_tree *tree, u64 start, u64 end);
138 int set_state_private(struct extent_map_tree *tree, u64 start, u64 private);
139 int get_state_private(struct extent_map_tree *tree, u64 start, u64 *private);
140 void set_page_extent_mapped(struct page *page);
142 struct extent_buffer *alloc_extent_buffer(struct extent_map_tree *tree,
143 u64 start, unsigned long len,
145 struct extent_buffer *find_extent_buffer(struct extent_map_tree *tree,
146 u64 start, unsigned long len,
148 void free_extent_buffer(struct extent_buffer *eb);
149 int read_extent_buffer_pages(struct extent_map_tree *tree,
150 struct extent_buffer *eb, int wait);
152 static inline void extent_buffer_get(struct extent_buffer *eb)
154 atomic_inc(&eb->refs);
157 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
160 void read_extent_buffer(struct extent_buffer *eb, void *dst,
163 void write_extent_buffer(struct extent_buffer *eb, const void *src,
164 unsigned long start, unsigned long len);
165 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
166 unsigned long dst_offset, unsigned long src_offset,
168 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
169 unsigned long src_offset, unsigned long len);
170 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
171 unsigned long src_offset, unsigned long len);
172 void memset_extent_buffer(struct extent_buffer *eb, char c,
173 unsigned long start, unsigned long len);
174 int wait_on_extent_buffer_writeback(struct extent_map_tree *tree,
175 struct extent_buffer *eb);
176 int clear_extent_buffer_dirty(struct extent_map_tree *tree,
177 struct extent_buffer *eb);
178 int set_extent_buffer_dirty(struct extent_map_tree *tree,
179 struct extent_buffer *eb);
180 int set_extent_buffer_uptodate(struct extent_map_tree *tree,
181 struct extent_buffer *eb);
182 int extent_buffer_uptodate(struct extent_map_tree *tree,
183 struct extent_buffer *eb);
184 int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
185 unsigned long min_len, char **token, char **map,
186 unsigned long *map_start,
187 unsigned long *map_len, int km);
188 void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);