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d1310b2e CM |
1 | #ifndef __EXTENTIO__ |
2 | #define __EXTENTIO__ | |
3 | ||
4 | #include <linux/rbtree.h> | |
5 | ||
6 | /* bits for the extent state */ | |
7 | #define EXTENT_DIRTY 1 | |
8 | #define EXTENT_WRITEBACK (1 << 1) | |
9 | #define EXTENT_UPTODATE (1 << 2) | |
10 | #define EXTENT_LOCKED (1 << 3) | |
11 | #define EXTENT_NEW (1 << 4) | |
12 | #define EXTENT_DELALLOC (1 << 5) | |
13 | #define EXTENT_DEFRAG (1 << 6) | |
14 | #define EXTENT_DEFRAG_DONE (1 << 7) | |
15 | #define EXTENT_BUFFER_FILLED (1 << 8) | |
16 | #define EXTENT_CSUM (1 << 9) | |
17 | #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK) | |
18 | ||
19 | /* | |
20 | * page->private values. Every page that is controlled by the extent | |
21 | * map has page->private set to one. | |
22 | */ | |
23 | #define EXTENT_PAGE_PRIVATE 1 | |
24 | #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3 | |
25 | ||
70dec807 CM |
26 | struct extent_state; |
27 | ||
d1310b2e CM |
28 | struct extent_io_ops { |
29 | int (*fill_delalloc)(struct inode *inode, u64 start, u64 end); | |
30 | int (*writepage_io_hook)(struct page *page, u64 start, u64 end); | |
31 | int (*readpage_io_hook)(struct page *page, u64 start, u64 end); | |
70dec807 CM |
32 | int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end, |
33 | struct extent_state *state); | |
34 | void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end, | |
35 | struct extent_state *state); | |
291d673e | 36 | int (*set_bit_hook)(struct inode *inode, u64 start, u64 end, |
b0c68f8b | 37 | unsigned long old, unsigned long bits); |
291d673e | 38 | int (*clear_bit_hook)(struct inode *inode, u64 start, u64 end, |
b0c68f8b | 39 | unsigned long old, unsigned long bits); |
d1310b2e CM |
40 | }; |
41 | ||
42 | struct extent_io_tree { | |
43 | struct rb_root state; | |
44 | struct address_space *mapping; | |
45 | u64 dirty_bytes; | |
70dec807 | 46 | spinlock_t lock; |
d1310b2e CM |
47 | struct extent_io_ops *ops; |
48 | spinlock_t lru_lock; | |
49 | struct list_head buffer_lru; | |
50 | int lru_size; | |
80ea96b1 | 51 | struct extent_state *last; |
d1310b2e CM |
52 | }; |
53 | ||
54 | struct extent_state { | |
55 | u64 start; | |
56 | u64 end; /* inclusive */ | |
d1310b2e | 57 | struct rb_node rb_node; |
70dec807 | 58 | struct extent_io_tree *tree; |
d1310b2e CM |
59 | wait_queue_head_t wq; |
60 | atomic_t refs; | |
61 | unsigned long state; | |
62 | ||
63 | /* for use by the FS */ | |
64 | u64 private; | |
65 | ||
66 | struct list_head list; | |
67 | }; | |
68 | ||
69 | struct extent_buffer { | |
70 | u64 start; | |
71 | unsigned long len; | |
72 | char *map_token; | |
73 | char *kaddr; | |
74 | unsigned long map_start; | |
75 | unsigned long map_len; | |
76 | struct page *first_page; | |
77 | struct list_head lru; | |
78 | atomic_t refs; | |
79 | int flags; | |
80 | }; | |
81 | ||
82 | struct extent_map_tree; | |
83 | ||
84 | typedef struct extent_map *(get_extent_t)(struct inode *inode, | |
85 | struct page *page, | |
86 | size_t page_offset, | |
87 | u64 start, u64 len, | |
88 | int create); | |
89 | ||
90 | void extent_io_tree_init(struct extent_io_tree *tree, | |
91 | struct address_space *mapping, gfp_t mask); | |
92 | void extent_io_tree_empty_lru(struct extent_io_tree *tree); | |
93 | int try_release_extent_mapping(struct extent_map_tree *map, | |
70dec807 CM |
94 | struct extent_io_tree *tree, struct page *page, |
95 | gfp_t mask); | |
d1310b2e CM |
96 | int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask); |
97 | int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask); | |
98 | int extent_read_full_page(struct extent_io_tree *tree, struct page *page, | |
99 | get_extent_t *get_extent); | |
100 | int __init extent_io_init(void); | |
101 | void extent_io_exit(void); | |
102 | ||
103 | u64 count_range_bits(struct extent_io_tree *tree, | |
104 | u64 *start, u64 search_end, | |
105 | u64 max_bytes, unsigned long bits); | |
106 | ||
107 | int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
108 | int bits, int filled); | |
109 | int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, | |
110 | int bits, gfp_t mask); | |
111 | int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, | |
112 | int bits, gfp_t mask); | |
113 | int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, | |
114 | gfp_t mask); | |
115 | int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end, | |
116 | gfp_t mask); | |
117 | int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, | |
118 | gfp_t mask); | |
119 | int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, | |
120 | gfp_t mask); | |
121 | int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end, | |
122 | gfp_t mask); | |
123 | int find_first_extent_bit(struct extent_io_tree *tree, u64 start, | |
124 | u64 *start_ret, u64 *end_ret, int bits); | |
125 | int extent_invalidatepage(struct extent_io_tree *tree, | |
126 | struct page *page, unsigned long offset); | |
127 | int extent_write_full_page(struct extent_io_tree *tree, struct page *page, | |
128 | get_extent_t *get_extent, | |
129 | struct writeback_control *wbc); | |
130 | int extent_writepages(struct extent_io_tree *tree, | |
131 | struct address_space *mapping, | |
132 | get_extent_t *get_extent, | |
133 | struct writeback_control *wbc); | |
134 | int extent_readpages(struct extent_io_tree *tree, | |
135 | struct address_space *mapping, | |
136 | struct list_head *pages, unsigned nr_pages, | |
137 | get_extent_t get_extent); | |
138 | int extent_prepare_write(struct extent_io_tree *tree, | |
139 | struct inode *inode, struct page *page, | |
140 | unsigned from, unsigned to, get_extent_t *get_extent); | |
141 | int extent_commit_write(struct extent_io_tree *tree, | |
142 | struct inode *inode, struct page *page, | |
143 | unsigned from, unsigned to); | |
144 | sector_t extent_bmap(struct address_space *mapping, sector_t iblock, | |
145 | get_extent_t *get_extent); | |
146 | int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end); | |
147 | int set_state_private(struct extent_io_tree *tree, u64 start, u64 private); | |
148 | int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private); | |
149 | void set_page_extent_mapped(struct page *page); | |
150 | ||
151 | struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree, | |
152 | u64 start, unsigned long len, | |
153 | struct page *page0, | |
154 | gfp_t mask); | |
155 | struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree, | |
156 | u64 start, unsigned long len, | |
157 | gfp_t mask); | |
158 | void free_extent_buffer(struct extent_buffer *eb); | |
159 | int read_extent_buffer_pages(struct extent_io_tree *tree, | |
160 | struct extent_buffer *eb, u64 start, int wait); | |
161 | ||
162 | static inline void extent_buffer_get(struct extent_buffer *eb) | |
163 | { | |
164 | atomic_inc(&eb->refs); | |
165 | } | |
166 | ||
167 | int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, | |
168 | unsigned long start, | |
169 | unsigned long len); | |
170 | void read_extent_buffer(struct extent_buffer *eb, void *dst, | |
171 | unsigned long start, | |
172 | unsigned long len); | |
173 | void write_extent_buffer(struct extent_buffer *eb, const void *src, | |
174 | unsigned long start, unsigned long len); | |
175 | void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, | |
176 | unsigned long dst_offset, unsigned long src_offset, | |
177 | unsigned long len); | |
178 | void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | |
179 | unsigned long src_offset, unsigned long len); | |
180 | void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | |
181 | unsigned long src_offset, unsigned long len); | |
182 | void memset_extent_buffer(struct extent_buffer *eb, char c, | |
183 | unsigned long start, unsigned long len); | |
184 | int wait_on_extent_buffer_writeback(struct extent_io_tree *tree, | |
185 | struct extent_buffer *eb); | |
186 | int clear_extent_buffer_dirty(struct extent_io_tree *tree, | |
187 | struct extent_buffer *eb); | |
188 | int set_extent_buffer_dirty(struct extent_io_tree *tree, | |
189 | struct extent_buffer *eb); | |
190 | int set_extent_buffer_uptodate(struct extent_io_tree *tree, | |
191 | struct extent_buffer *eb); | |
192 | int extent_buffer_uptodate(struct extent_io_tree *tree, | |
193 | struct extent_buffer *eb); | |
194 | int map_extent_buffer(struct extent_buffer *eb, unsigned long offset, | |
195 | unsigned long min_len, char **token, char **map, | |
196 | unsigned long *map_start, | |
197 | unsigned long *map_len, int km); | |
198 | int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset, | |
199 | unsigned long min_len, char **token, char **map, | |
200 | unsigned long *map_start, | |
201 | unsigned long *map_len, int km); | |
202 | void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km); | |
203 | #endif |