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-rw-r--r--fs/btrfs/extent_io.h269
1 files changed, 269 insertions, 0 deletions
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
new file mode 100644
index 000000000000..c5b483a79137
--- /dev/null
+++ b/fs/btrfs/extent_io.h
@@ -0,0 +1,269 @@
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_NODATASUM (1 << 12)
20#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
21
22/* flags for bio submission */
23#define EXTENT_BIO_COMPRESSED 1
24
25/*
26 * page->private values. Every page that is controlled by the extent
27 * map has page->private set to one.
28 */
29#define EXTENT_PAGE_PRIVATE 1
30#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
31
32struct extent_state;
33
34typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
35 struct bio *bio, int mirror_num,
36 unsigned long bio_flags);
37struct extent_io_ops {
38 int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
39 u64 start, u64 end, int *page_started,
40 unsigned long *nr_written);
41 int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
42 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
43 extent_submit_bio_hook_t *submit_bio_hook;
44 int (*merge_bio_hook)(struct page *page, unsigned long offset,
45 size_t size, struct bio *bio,
46 unsigned long bio_flags);
47 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
48 int (*readpage_io_failed_hook)(struct bio *bio, struct page *page,
49 u64 start, u64 end,
50 struct extent_state *state);
51 int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
52 u64 start, u64 end,
53 struct extent_state *state);
54 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
55 struct extent_state *state);
56 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
57 struct extent_state *state, int uptodate);
58 int (*set_bit_hook)(struct inode *inode, u64 start, u64 end,
59 unsigned long old, unsigned long bits);
60 int (*clear_bit_hook)(struct inode *inode, u64 start, u64 end,
61 unsigned long old, unsigned long bits);
62 int (*write_cache_pages_lock_hook)(struct page *page);
63};
64
65struct extent_io_tree {
66 struct rb_root state;
67 struct rb_root buffer;
68 struct address_space *mapping;
69 u64 dirty_bytes;
70 spinlock_t lock;
71 spinlock_t buffer_lock;
72 struct extent_io_ops *ops;
73};
74
75struct extent_state {
76 u64 start;
77 u64 end; /* inclusive */
78 struct rb_node rb_node;
79 struct extent_io_tree *tree;
80 wait_queue_head_t wq;
81 atomic_t refs;
82 unsigned long state;
83
84 /* for use by the FS */
85 u64 private;
86
87 struct list_head leak_list;
88};
89
90struct extent_buffer {
91 u64 start;
92 unsigned long len;
93 char *map_token;
94 char *kaddr;
95 unsigned long map_start;
96 unsigned long map_len;
97 struct page *first_page;
98 atomic_t refs;
99 int flags;
100 struct list_head leak_list;
101 struct rb_node rb_node;
102 struct mutex mutex;
103};
104
105struct extent_map_tree;
106
107static inline struct extent_state *extent_state_next(struct extent_state *state)
108{
109 struct rb_node *node;
110 node = rb_next(&state->rb_node);
111 if (!node)
112 return NULL;
113 return rb_entry(node, struct extent_state, rb_node);
114}
115
116typedef struct extent_map *(get_extent_t)(struct inode *inode,
117 struct page *page,
118 size_t page_offset,
119 u64 start, u64 len,
120 int create);
121
122void extent_io_tree_init(struct extent_io_tree *tree,
123 struct address_space *mapping, gfp_t mask);
124int try_release_extent_mapping(struct extent_map_tree *map,
125 struct extent_io_tree *tree, struct page *page,
126 gfp_t mask);
127int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
128int try_release_extent_state(struct extent_map_tree *map,
129 struct extent_io_tree *tree, struct page *page,
130 gfp_t mask);
131int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
132int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
133int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
134 gfp_t mask);
135int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
136 get_extent_t *get_extent);
137int __init extent_io_init(void);
138void extent_io_exit(void);
139
140u64 count_range_bits(struct extent_io_tree *tree,
141 u64 *start, u64 search_end,
142 u64 max_bytes, unsigned long bits);
143
144int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
145 int bits, int filled);
146int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
147 int bits, gfp_t mask);
148int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
149 int bits, int wake, int delete, gfp_t mask);
150int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
151 int bits, gfp_t mask);
152int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
153 gfp_t mask);
154int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
155 gfp_t mask);
156int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
157 gfp_t mask);
158int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
159 gfp_t mask);
160int clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
161 gfp_t mask);
162int clear_extent_ordered_metadata(struct extent_io_tree *tree, u64 start,
163 u64 end, gfp_t mask);
164int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
165 gfp_t mask);
166int set_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
167 gfp_t mask);
168int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
169 u64 *start_ret, u64 *end_ret, int bits);
170struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
171 u64 start, int bits);
172int extent_invalidatepage(struct extent_io_tree *tree,
173 struct page *page, unsigned long offset);
174int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
175 get_extent_t *get_extent,
176 struct writeback_control *wbc);
177int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
178 u64 start, u64 end, get_extent_t *get_extent,
179 int mode);
180int extent_writepages(struct extent_io_tree *tree,
181 struct address_space *mapping,
182 get_extent_t *get_extent,
183 struct writeback_control *wbc);
184int extent_readpages(struct extent_io_tree *tree,
185 struct address_space *mapping,
186 struct list_head *pages, unsigned nr_pages,
187 get_extent_t get_extent);
188int extent_prepare_write(struct extent_io_tree *tree,
189 struct inode *inode, struct page *page,
190 unsigned from, unsigned to, get_extent_t *get_extent);
191int extent_commit_write(struct extent_io_tree *tree,
192 struct inode *inode, struct page *page,
193 unsigned from, unsigned to);
194sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
195 get_extent_t *get_extent);
196int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
197int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
198int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
199void set_page_extent_mapped(struct page *page);
200
201struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
202 u64 start, unsigned long len,
203 struct page *page0,
204 gfp_t mask);
205struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
206 u64 start, unsigned long len,
207 gfp_t mask);
208void free_extent_buffer(struct extent_buffer *eb);
209int read_extent_buffer_pages(struct extent_io_tree *tree,
210 struct extent_buffer *eb, u64 start, int wait,
211 get_extent_t *get_extent, int mirror_num);
212
213static inline void extent_buffer_get(struct extent_buffer *eb)
214{
215 atomic_inc(&eb->refs);
216}
217
218int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
219 unsigned long start,
220 unsigned long len);
221void read_extent_buffer(struct extent_buffer *eb, void *dst,
222 unsigned long start,
223 unsigned long len);
224void write_extent_buffer(struct extent_buffer *eb, const void *src,
225 unsigned long start, unsigned long len);
226void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
227 unsigned long dst_offset, unsigned long src_offset,
228 unsigned long len);
229void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
230 unsigned long src_offset, unsigned long len);
231void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
232 unsigned long src_offset, unsigned long len);
233void memset_extent_buffer(struct extent_buffer *eb, char c,
234 unsigned long start, unsigned long len);
235int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
236 struct extent_buffer *eb);
237int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end);
238int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
239int clear_extent_buffer_dirty(struct extent_io_tree *tree,
240 struct extent_buffer *eb);
241int set_extent_buffer_dirty(struct extent_io_tree *tree,
242 struct extent_buffer *eb);
243int set_extent_buffer_uptodate(struct extent_io_tree *tree,
244 struct extent_buffer *eb);
245int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
246 struct extent_buffer *eb);
247int extent_buffer_uptodate(struct extent_io_tree *tree,
248 struct extent_buffer *eb);
249int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
250 unsigned long min_len, char **token, char **map,
251 unsigned long *map_start,
252 unsigned long *map_len, int km);
253int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
254 unsigned long min_len, char **token, char **map,
255 unsigned long *map_start,
256 unsigned long *map_len, int km);
257void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
258int release_extent_buffer_tail_pages(struct extent_buffer *eb);
259int extent_range_uptodate(struct extent_io_tree *tree,
260 u64 start, u64 end);
261int extent_clear_unlock_delalloc(struct inode *inode,
262 struct extent_io_tree *tree,
263 u64 start, u64 end, struct page *locked_page,
264 int unlock_page,
265 int clear_unlock,
266 int clear_delalloc, int clear_dirty,
267 int set_writeback,
268 int end_writeback);
269#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-10-05 11:20:49 -0400