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-rw-r--r--fs/btrfs/extent_io.h248
1 files changed, 248 insertions, 0 deletions
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
new file mode 100644
index 000000000000..c9d1908a1ae3
--- /dev/null
+++ b/fs/btrfs/extent_io.h
@@ -0,0 +1,248 @@
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_ORDERED (1 << 9)
17#define EXTENT_ORDERED_METADATA (1 << 10)
18#define EXTENT_BOUNDARY (1 << 11)
19#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
20
21/*
22 * page->private values. Every page that is controlled by the extent
23 * map has page->private set to one.
24 */
25#define EXTENT_PAGE_PRIVATE 1
26#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
27
28struct extent_state;
29
30typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
31 struct bio *bio, int mirror_num);
32struct extent_io_ops {
33 int (*fill_delalloc)(struct inode *inode, u64 start, u64 end);
34 int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
35 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
36 extent_submit_bio_hook_t *submit_bio_hook;
37 int (*merge_bio_hook)(struct page *page, unsigned long offset,
38 size_t size, struct bio *bio);
39 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
40 int (*readpage_io_failed_hook)(struct bio *bio, struct page *page,
41 u64 start, u64 end,
42 struct extent_state *state);
43 int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
44 u64 start, u64 end,
45 struct extent_state *state);
46 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
47 struct extent_state *state);
48 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
49 struct extent_state *state, int uptodate);
50 int (*set_bit_hook)(struct inode *inode, u64 start, u64 end,
51 unsigned long old, unsigned long bits);
52 int (*clear_bit_hook)(struct inode *inode, u64 start, u64 end,
53 unsigned long old, unsigned long bits);
54 int (*write_cache_pages_lock_hook)(struct page *page);
55};
56
57struct extent_io_tree {
58 struct rb_root state;
59 struct rb_root buffer;
60 struct address_space *mapping;
61 u64 dirty_bytes;
62 spinlock_t lock;
63 spinlock_t buffer_lock;
64 struct extent_io_ops *ops;
65};
66
67struct extent_state {
68 u64 start;
69 u64 end; /* inclusive */
70 struct rb_node rb_node;
71 struct extent_io_tree *tree;
72 wait_queue_head_t wq;
73 atomic_t refs;
74 unsigned long state;
75
76 /* for use by the FS */
77 u64 private;
78
79 struct list_head leak_list;
80};
81
82struct extent_buffer {
83 u64 start;
84 unsigned long len;
85 char *map_token;
86 char *kaddr;
87 unsigned long map_start;
88 unsigned long map_len;
89 struct page *first_page;
90 atomic_t refs;
91 int flags;
92 struct list_head leak_list;
93 struct rb_node rb_node;
94 struct mutex mutex;
95};
96
97struct extent_map_tree;
98
99static inline struct extent_state *extent_state_next(struct extent_state *state)
100{
101 struct rb_node *node;
102 node = rb_next(&state->rb_node);
103 if (!node)
104 return NULL;
105 return rb_entry(node, struct extent_state, rb_node);
106}
107
108typedef struct extent_map *(get_extent_t)(struct inode *inode,
109 struct page *page,
110 size_t page_offset,
111 u64 start, u64 len,
112 int create);
113
114void extent_io_tree_init(struct extent_io_tree *tree,
115 struct address_space *mapping, gfp_t mask);
116int try_release_extent_mapping(struct extent_map_tree *map,
117 struct extent_io_tree *tree, struct page *page,
118 gfp_t mask);
119int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
120int try_release_extent_state(struct extent_map_tree *map,
121 struct extent_io_tree *tree, struct page *page,
122 gfp_t mask);
123int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
124int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
125int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
126 get_extent_t *get_extent);
127int __init extent_io_init(void);
128void extent_io_exit(void);
129
130u64 count_range_bits(struct extent_io_tree *tree,
131 u64 *start, u64 search_end,
132 u64 max_bytes, unsigned long bits);
133
134int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
135 int bits, int filled);
136int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
137 int bits, gfp_t mask);
138int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
139 int bits, int wake, int delete, gfp_t mask);
140int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
141 int bits, gfp_t mask);
142int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
143 gfp_t mask);
144int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
145 gfp_t mask);
146int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
147 gfp_t mask);
148int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
149 gfp_t mask);
150int clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
151 gfp_t mask);
152int clear_extent_ordered_metadata(struct extent_io_tree *tree, u64 start,
153 u64 end, gfp_t mask);
154int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
155 gfp_t mask);
156int set_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
157 gfp_t mask);
158int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
159 u64 *start_ret, u64 *end_ret, int bits);
160struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
161 u64 start, int bits);
162int extent_invalidatepage(struct extent_io_tree *tree,
163 struct page *page, unsigned long offset);
164int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
165 get_extent_t *get_extent,
166 struct writeback_control *wbc);
167int extent_writepages(struct extent_io_tree *tree,
168 struct address_space *mapping,
169 get_extent_t *get_extent,
170 struct writeback_control *wbc);
171int extent_readpages(struct extent_io_tree *tree,
172 struct address_space *mapping,
173 struct list_head *pages, unsigned nr_pages,
174 get_extent_t get_extent);
175int extent_prepare_write(struct extent_io_tree *tree,
176 struct inode *inode, struct page *page,
177 unsigned from, unsigned to, get_extent_t *get_extent);
178int extent_commit_write(struct extent_io_tree *tree,
179 struct inode *inode, struct page *page,
180 unsigned from, unsigned to);
181sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
182 get_extent_t *get_extent);
183int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
184int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
185int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
186void set_page_extent_mapped(struct page *page);
187
188struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
189 u64 start, unsigned long len,
190 struct page *page0,
191 gfp_t mask);
192struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
193 u64 start, unsigned long len,
194 gfp_t mask);
195void free_extent_buffer(struct extent_buffer *eb);
196int read_extent_buffer_pages(struct extent_io_tree *tree,
197 struct extent_buffer *eb, u64 start, int wait,
198 get_extent_t *get_extent, int mirror_num);
199
200static inline void extent_buffer_get(struct extent_buffer *eb)
201{
202 atomic_inc(&eb->refs);
203}
204
205int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
206 unsigned long start,
207 unsigned long len);
208void read_extent_buffer(struct extent_buffer *eb, void *dst,
209 unsigned long start,
210 unsigned long len);
211void write_extent_buffer(struct extent_buffer *eb, const void *src,
212 unsigned long start, unsigned long len);
213void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
214 unsigned long dst_offset, unsigned long src_offset,
215 unsigned long len);
216void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
217 unsigned long src_offset, unsigned long len);
218void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
219 unsigned long src_offset, unsigned long len);
220void memset_extent_buffer(struct extent_buffer *eb, char c,
221 unsigned long start, unsigned long len);
222int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
223 struct extent_buffer *eb);
224int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end);
225int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
226int clear_extent_buffer_dirty(struct extent_io_tree *tree,
227 struct extent_buffer *eb);
228int set_extent_buffer_dirty(struct extent_io_tree *tree,
229 struct extent_buffer *eb);
230int set_extent_buffer_uptodate(struct extent_io_tree *tree,
231 struct extent_buffer *eb);
232int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
233 struct extent_buffer *eb);
234int extent_buffer_uptodate(struct extent_io_tree *tree,
235 struct extent_buffer *eb);
236int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
237 unsigned long min_len, char **token, char **map,
238 unsigned long *map_start,
239 unsigned long *map_len, int km);
240int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
241 unsigned long min_len, char **token, char **map,
242 unsigned long *map_start,
243 unsigned long *map_len, int km);
244void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
245int release_extent_buffer_tail_pages(struct extent_buffer *eb);
246int extent_range_uptodate(struct extent_io_tree *tree,
247 u64 start, u64 end);
248#endif
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-08 08:45:14 -0500