tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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_BOUNDARY (1 << 9)
17#define EXTENT_NODATASUM (1 << 10)
18#define EXTENT_DO_ACCOUNTING (1 << 11)
19#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
20
21/* flags for bio submission */
22#define EXTENT_BIO_COMPRESSED 1
23
24/* these are bit numbers for test/set bit */
25#define EXTENT_BUFFER_UPTODATE 0
26#define EXTENT_BUFFER_BLOCKING 1
27#define EXTENT_BUFFER_DIRTY 2
28
29/* these are flags for extent_clear_unlock_delalloc */
30#define EXTENT_CLEAR_UNLOCK_PAGE 0x1
31#define EXTENT_CLEAR_UNLOCK 0x2
32#define EXTENT_CLEAR_DELALLOC 0x4
33#define EXTENT_CLEAR_DIRTY 0x8
34#define EXTENT_SET_WRITEBACK 0x10
35#define EXTENT_END_WRITEBACK 0x20
36#define EXTENT_SET_PRIVATE2 0x40
37#define EXTENT_CLEAR_ACCOUNTING 0x80
38
39/*
40 * page->private values. Every page that is controlled by the extent
41 * map has page->private set to one.
42 */
43#define EXTENT_PAGE_PRIVATE 1
44#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
45
46struct extent_state;
47
48typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
49 struct bio *bio, int mirror_num,
50 unsigned long bio_flags);
51struct extent_io_ops {
52 int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
53 u64 start, u64 end, int *page_started,
54 unsigned long *nr_written);
55 int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
56 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
57 extent_submit_bio_hook_t *submit_bio_hook;
58 int (*merge_bio_hook)(struct page *page, unsigned long offset,
59 size_t size, struct bio *bio,
60 unsigned long bio_flags);
61 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
62 int (*readpage_io_failed_hook)(struct bio *bio, struct page *page,
63 u64 start, u64 end,
64 struct extent_state *state);
65 int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
66 u64 start, u64 end,
67 struct extent_state *state);
68 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
69 struct extent_state *state);
70 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
71 struct extent_state *state, int uptodate);
72 int (*set_bit_hook)(struct inode *inode, u64 start, u64 end,
73 unsigned long old, unsigned long bits);
74 int (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
75 unsigned long bits);
76 int (*merge_extent_hook)(struct inode *inode,
77 struct extent_state *new,
78 struct extent_state *other);
79 int (*split_extent_hook)(struct inode *inode,
80 struct extent_state *orig, u64 split);
81 int (*write_cache_pages_lock_hook)(struct page *page);
82};
83
84struct extent_io_tree {
85 struct rb_root state;
86 struct rb_root buffer;
87 struct address_space *mapping;
88 u64 dirty_bytes;
89 spinlock_t lock;
90 spinlock_t buffer_lock;
91 struct extent_io_ops *ops;
92};
93
94struct extent_state {
95 u64 start;
96 u64 end; /* inclusive */
97 struct rb_node rb_node;
98
99 /* ADD NEW ELEMENTS AFTER THIS */
100 struct extent_io_tree *tree;
101 wait_queue_head_t wq;
102 atomic_t refs;
103 unsigned long state;
104 u64 split_start;
105 u64 split_end;
106
107 /* for use by the FS */
108 u64 private;
109
110 struct list_head leak_list;
111};
112
113struct extent_buffer {
114 u64 start;
115 unsigned long len;
116 char *map_token;
117 char *kaddr;
118 unsigned long map_start;
119 unsigned long map_len;
120 struct page *first_page;
121 unsigned long bflags;
122 atomic_t refs;
123 struct list_head leak_list;
124 struct rb_node rb_node;
125
126 /* the spinlock is used to protect most operations */
127 spinlock_t lock;
128
129 /*
130 * when we keep the lock held while blocking, waiters go onto
131 * the wq
132 */
133 wait_queue_head_t lock_wq;
134};
135
136struct extent_map_tree;
137
138static inline struct extent_state *extent_state_next(struct extent_state *state)
139{
140 struct rb_node *node;
141 node = rb_next(&state->rb_node);
142 if (!node)
143 return NULL;
144 return rb_entry(node, struct extent_state, rb_node);
145}
146
147typedef struct extent_map *(get_extent_t)(struct inode *inode,
148 struct page *page,
149 size_t page_offset,
150 u64 start, u64 len,
151 int create);
152
153void extent_io_tree_init(struct extent_io_tree *tree,
154 struct address_space *mapping, gfp_t mask);
155int try_release_extent_mapping(struct extent_map_tree *map,
156 struct extent_io_tree *tree, struct page *page,
157 gfp_t mask);
158int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
159int try_release_extent_state(struct extent_map_tree *map,
160 struct extent_io_tree *tree, struct page *page,
161 gfp_t mask);
162int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
163int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
164 int bits, struct extent_state **cached, gfp_t mask);
165int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
166int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
167 gfp_t mask);
168int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
169 get_extent_t *get_extent);
170int __init extent_io_init(void);
171void extent_io_exit(void);
172
173u64 count_range_bits(struct extent_io_tree *tree,
174 u64 *start, u64 search_end,
175 u64 max_bytes, unsigned long bits);
176
177int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
178 int bits, int filled, struct extent_state *cached_state);
179int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
180 int bits, gfp_t mask);
181int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
182 int bits, int wake, int delete, struct extent_state **cached,
183 gfp_t mask);
184int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
185 int bits, gfp_t mask);
186int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
187 gfp_t mask);
188int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
189 gfp_t mask);
190int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
191 gfp_t mask);
192int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
193 gfp_t mask);
194int clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
195 gfp_t mask);
196int clear_extent_ordered_metadata(struct extent_io_tree *tree, u64 start,
197 u64 end, gfp_t mask);
198int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
199 gfp_t mask);
200int set_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
201 gfp_t mask);
202int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
203 u64 *start_ret, u64 *end_ret, int bits);
204struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
205 u64 start, int bits);
206int extent_invalidatepage(struct extent_io_tree *tree,
207 struct page *page, unsigned long offset);
208int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
209 get_extent_t *get_extent,
210 struct writeback_control *wbc);
211int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
212 u64 start, u64 end, get_extent_t *get_extent,
213 int mode);
214int extent_writepages(struct extent_io_tree *tree,
215 struct address_space *mapping,
216 get_extent_t *get_extent,
217 struct writeback_control *wbc);
218int extent_readpages(struct extent_io_tree *tree,
219 struct address_space *mapping,
220 struct list_head *pages, unsigned nr_pages,
221 get_extent_t get_extent);
222int extent_prepare_write(struct extent_io_tree *tree,
223 struct inode *inode, struct page *page,
224 unsigned from, unsigned to, get_extent_t *get_extent);
225int extent_commit_write(struct extent_io_tree *tree,
226 struct inode *inode, struct page *page,
227 unsigned from, unsigned to);
228sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
229 get_extent_t *get_extent);
230int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
231 __u64 start, __u64 len, get_extent_t *get_extent);
232int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
233int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
234int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
235void set_page_extent_mapped(struct page *page);
236
237struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
238 u64 start, unsigned long len,
239 struct page *page0,
240 gfp_t mask);
241struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
242 u64 start, unsigned long len,
243 gfp_t mask);
244void free_extent_buffer(struct extent_buffer *eb);
245int read_extent_buffer_pages(struct extent_io_tree *tree,
246 struct extent_buffer *eb, u64 start, int wait,
247 get_extent_t *get_extent, int mirror_num);
248
249static inline void extent_buffer_get(struct extent_buffer *eb)
250{
251 atomic_inc(&eb->refs);
252}
253
254int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
255 unsigned long start,
256 unsigned long len);
257void read_extent_buffer(struct extent_buffer *eb, void *dst,
258 unsigned long start,
259 unsigned long len);
260void write_extent_buffer(struct extent_buffer *eb, const void *src,
261 unsigned long start, unsigned long len);
262void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
263 unsigned long dst_offset, unsigned long src_offset,
264 unsigned long len);
265void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
266 unsigned long src_offset, unsigned long len);
267void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
268 unsigned long src_offset, unsigned long len);
269void memset_extent_buffer(struct extent_buffer *eb, char c,
270 unsigned long start, unsigned long len);
271int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
272 struct extent_buffer *eb);
273int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end);
274int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
275int clear_extent_buffer_dirty(struct extent_io_tree *tree,
276 struct extent_buffer *eb);
277int set_extent_buffer_dirty(struct extent_io_tree *tree,
278 struct extent_buffer *eb);
279int test_extent_buffer_dirty(struct extent_io_tree *tree,
280 struct extent_buffer *eb);
281int set_extent_buffer_uptodate(struct extent_io_tree *tree,
282 struct extent_buffer *eb);
283int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
284 struct extent_buffer *eb);
285int extent_buffer_uptodate(struct extent_io_tree *tree,
286 struct extent_buffer *eb);
287int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
288 unsigned long min_len, char **token, char **map,
289 unsigned long *map_start,
290 unsigned long *map_len, int km);
291int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
292 unsigned long min_len, char **token, char **map,
293 unsigned long *map_start,
294 unsigned long *map_len, int km);
295void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
296int release_extent_buffer_tail_pages(struct extent_buffer *eb);
297int extent_range_uptodate(struct extent_io_tree *tree,
298 u64 start, u64 end);
299int extent_clear_unlock_delalloc(struct inode *inode,
300 struct extent_io_tree *tree,
301 u64 start, u64 end, struct page *locked_page,
302 unsigned long op);
303#endif