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Chris Masond1310b22008-01-24 16:13:08 -05001#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)
Chris Masone6dcd2d2008-07-17 12:53:50 -040016#define EXTENT_ORDERED (1 << 9)
17#define EXTENT_ORDERED_METADATA (1 << 10)
Zheng Yan5b21f2e2008-09-26 10:05:38 -040018#define EXTENT_BOUNDARY (1 << 11)
Yan Zheng17d217f2008-12-12 10:03:38 -050019#define EXTENT_NODATASUM (1 << 12)
Chris Masond1310b22008-01-24 16:13:08 -050020#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
21
Chris Masonc8b97812008-10-29 14:49:59 -040022/* flags for bio submission */
23#define EXTENT_BIO_COMPRESSED 1
24
Chris Masonb4ce94d2009-02-04 09:25:08 -050025/* these are bit numbers for test/set bit */
26#define EXTENT_BUFFER_UPTODATE 0
27#define EXTENT_BUFFER_BLOCKING 1
Chris Masonb9473432009-03-13 11:00:37 -040028#define EXTENT_BUFFER_DIRTY 2
Chris Masonb4ce94d2009-02-04 09:25:08 -050029
Chris Masond1310b22008-01-24 16:13:08 -050030/*
31 * page->private values. Every page that is controlled by the extent
32 * map has page->private set to one.
33 */
34#define EXTENT_PAGE_PRIVATE 1
35#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
36
Chris Mason70dec802008-01-29 09:59:12 -050037struct extent_state;
38
Chris Mason44b8bd72008-04-16 11:14:51 -040039typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
Chris Masonc8b97812008-10-29 14:49:59 -040040 struct bio *bio, int mirror_num,
41 unsigned long bio_flags);
Chris Masond1310b22008-01-24 16:13:08 -050042struct extent_io_ops {
Chris Masonc8b97812008-10-29 14:49:59 -040043 int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
Chris Mason771ed682008-11-06 22:02:51 -050044 u64 start, u64 end, int *page_started,
45 unsigned long *nr_written);
Chris Mason247e7432008-07-17 12:53:51 -040046 int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
Chris Masond1310b22008-01-24 16:13:08 -050047 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
Chris Mason44b8bd72008-04-16 11:14:51 -040048 extent_submit_bio_hook_t *submit_bio_hook;
Chris Mason239b14b2008-03-24 15:02:07 -040049 int (*merge_bio_hook)(struct page *page, unsigned long offset,
Chris Masonc8b97812008-10-29 14:49:59 -040050 size_t size, struct bio *bio,
51 unsigned long bio_flags);
Chris Masond1310b22008-01-24 16:13:08 -050052 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
Chris Mason7e383262008-04-09 16:28:12 -040053 int (*readpage_io_failed_hook)(struct bio *bio, struct page *page,
54 u64 start, u64 end,
55 struct extent_state *state);
Chris Mason1259ab72008-05-12 13:39:03 -040056 int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
57 u64 start, u64 end,
58 struct extent_state *state);
Chris Mason70dec802008-01-29 09:59:12 -050059 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
60 struct extent_state *state);
Chris Mason1259ab72008-05-12 13:39:03 -040061 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
Chris Masone6dcd2d2008-07-17 12:53:50 -040062 struct extent_state *state, int uptodate);
Chris Mason291d6732008-01-29 15:55:23 -050063 int (*set_bit_hook)(struct inode *inode, u64 start, u64 end,
Chris Masonb0c68f82008-01-31 11:05:37 -050064 unsigned long old, unsigned long bits);
Chris Mason291d6732008-01-29 15:55:23 -050065 int (*clear_bit_hook)(struct inode *inode, u64 start, u64 end,
Chris Masonb0c68f82008-01-31 11:05:37 -050066 unsigned long old, unsigned long bits);
Chris Mason4bef0842008-09-08 11:18:08 -040067 int (*write_cache_pages_lock_hook)(struct page *page);
Chris Masond1310b22008-01-24 16:13:08 -050068};
69
70struct extent_io_tree {
71 struct rb_root state;
Chris Mason6af118ce2008-07-22 11:18:07 -040072 struct rb_root buffer;
Chris Masond1310b22008-01-24 16:13:08 -050073 struct address_space *mapping;
74 u64 dirty_bytes;
Chris Mason70dec802008-01-29 09:59:12 -050075 spinlock_t lock;
Chris Mason6af118ce2008-07-22 11:18:07 -040076 spinlock_t buffer_lock;
Chris Masond1310b22008-01-24 16:13:08 -050077 struct extent_io_ops *ops;
Chris Masond1310b22008-01-24 16:13:08 -050078};
79
80struct extent_state {
81 u64 start;
82 u64 end; /* inclusive */
Chris Masond1310b22008-01-24 16:13:08 -050083 struct rb_node rb_node;
Chris Mason70dec802008-01-29 09:59:12 -050084 struct extent_io_tree *tree;
Chris Masond1310b22008-01-24 16:13:08 -050085 wait_queue_head_t wq;
86 atomic_t refs;
87 unsigned long state;
88
89 /* for use by the FS */
90 u64 private;
91
Chris Mason2d2ae542008-03-26 16:24:23 -040092 struct list_head leak_list;
Chris Masond1310b22008-01-24 16:13:08 -050093};
94
95struct extent_buffer {
96 u64 start;
97 unsigned long len;
98 char *map_token;
99 char *kaddr;
100 unsigned long map_start;
101 unsigned long map_len;
102 struct page *first_page;
Chris Masonb4ce94d2009-02-04 09:25:08 -0500103 unsigned long bflags;
Chris Masond1310b22008-01-24 16:13:08 -0500104 atomic_t refs;
Chris Mason2d2ae542008-03-26 16:24:23 -0400105 struct list_head leak_list;
Chris Mason6af118ce2008-07-22 11:18:07 -0400106 struct rb_node rb_node;
Chris Masonb4ce94d2009-02-04 09:25:08 -0500107
108 /* the spinlock is used to protect most operations */
109 spinlock_t lock;
110
111 /*
112 * when we keep the lock held while blocking, waiters go onto
113 * the wq
114 */
115 wait_queue_head_t lock_wq;
Chris Masond1310b22008-01-24 16:13:08 -0500116};
117
118struct extent_map_tree;
119
Chris Masond7fc6402008-02-18 12:12:38 -0500120static inline struct extent_state *extent_state_next(struct extent_state *state)
121{
122 struct rb_node *node;
123 node = rb_next(&state->rb_node);
124 if (!node)
125 return NULL;
126 return rb_entry(node, struct extent_state, rb_node);
127}
128
Chris Masond1310b22008-01-24 16:13:08 -0500129typedef struct extent_map *(get_extent_t)(struct inode *inode,
130 struct page *page,
131 size_t page_offset,
132 u64 start, u64 len,
133 int create);
134
135void extent_io_tree_init(struct extent_io_tree *tree,
136 struct address_space *mapping, gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500137int try_release_extent_mapping(struct extent_map_tree *map,
Chris Mason70dec802008-01-29 09:59:12 -0500138 struct extent_io_tree *tree, struct page *page,
139 gfp_t mask);
Chris Mason6af118ce2008-07-22 11:18:07 -0400140int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
Chris Mason7b13b7b2008-04-18 10:29:50 -0400141int try_release_extent_state(struct extent_map_tree *map,
142 struct extent_io_tree *tree, struct page *page,
143 gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500144int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
145int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
Josef Bacik25179202008-10-29 14:49:05 -0400146int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
147 gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500148int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
149 get_extent_t *get_extent);
150int __init extent_io_init(void);
151void extent_io_exit(void);
152
153u64 count_range_bits(struct extent_io_tree *tree,
154 u64 *start, u64 search_end,
155 u64 max_bytes, unsigned long bits);
156
157int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
158 int bits, int filled);
159int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
160 int bits, gfp_t mask);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400161int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
162 int bits, int wake, int delete, gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500163int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
164 int bits, gfp_t mask);
165int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
166 gfp_t mask);
167int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
168 gfp_t mask);
169int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
170 gfp_t mask);
171int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
172 gfp_t mask);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400173int clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
174 gfp_t mask);
175int clear_extent_ordered_metadata(struct extent_io_tree *tree, u64 start,
176 u64 end, gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500177int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
178 gfp_t mask);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400179int set_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
180 gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500181int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
182 u64 *start_ret, u64 *end_ret, int bits);
Chris Masond7fc6402008-02-18 12:12:38 -0500183struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
184 u64 start, int bits);
Chris Masond1310b22008-01-24 16:13:08 -0500185int extent_invalidatepage(struct extent_io_tree *tree,
186 struct page *page, unsigned long offset);
187int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
188 get_extent_t *get_extent,
189 struct writeback_control *wbc);
Chris Mason771ed682008-11-06 22:02:51 -0500190int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
191 u64 start, u64 end, get_extent_t *get_extent,
192 int mode);
Chris Masond1310b22008-01-24 16:13:08 -0500193int extent_writepages(struct extent_io_tree *tree,
194 struct address_space *mapping,
195 get_extent_t *get_extent,
196 struct writeback_control *wbc);
197int extent_readpages(struct extent_io_tree *tree,
198 struct address_space *mapping,
199 struct list_head *pages, unsigned nr_pages,
200 get_extent_t get_extent);
201int extent_prepare_write(struct extent_io_tree *tree,
202 struct inode *inode, struct page *page,
203 unsigned from, unsigned to, get_extent_t *get_extent);
204int extent_commit_write(struct extent_io_tree *tree,
205 struct inode *inode, struct page *page,
206 unsigned from, unsigned to);
207sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
208 get_extent_t *get_extent);
Yehuda Sadeh1506fcc2009-01-21 14:39:14 -0500209int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
210 __u64 start, __u64 len, get_extent_t *get_extent);
Chris Masond1310b22008-01-24 16:13:08 -0500211int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
212int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
213int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
214void set_page_extent_mapped(struct page *page);
215
216struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
217 u64 start, unsigned long len,
218 struct page *page0,
219 gfp_t mask);
220struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
221 u64 start, unsigned long len,
222 gfp_t mask);
223void free_extent_buffer(struct extent_buffer *eb);
224int read_extent_buffer_pages(struct extent_io_tree *tree,
Chris Masona86c12c2008-02-07 10:50:54 -0500225 struct extent_buffer *eb, u64 start, int wait,
Chris Masonf1885912008-04-09 16:28:12 -0400226 get_extent_t *get_extent, int mirror_num);
Chris Masond1310b22008-01-24 16:13:08 -0500227
228static inline void extent_buffer_get(struct extent_buffer *eb)
229{
230 atomic_inc(&eb->refs);
231}
232
233int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
234 unsigned long start,
235 unsigned long len);
236void read_extent_buffer(struct extent_buffer *eb, void *dst,
237 unsigned long start,
238 unsigned long len);
239void write_extent_buffer(struct extent_buffer *eb, const void *src,
240 unsigned long start, unsigned long len);
241void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
242 unsigned long dst_offset, unsigned long src_offset,
243 unsigned long len);
244void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
245 unsigned long src_offset, unsigned long len);
246void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
247 unsigned long src_offset, unsigned long len);
248void memset_extent_buffer(struct extent_buffer *eb, char c,
249 unsigned long start, unsigned long len);
250int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
251 struct extent_buffer *eb);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400252int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end);
253int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
Chris Masond1310b22008-01-24 16:13:08 -0500254int clear_extent_buffer_dirty(struct extent_io_tree *tree,
255 struct extent_buffer *eb);
256int set_extent_buffer_dirty(struct extent_io_tree *tree,
257 struct extent_buffer *eb);
Chris Masonb9473432009-03-13 11:00:37 -0400258int test_extent_buffer_dirty(struct extent_io_tree *tree,
259 struct extent_buffer *eb);
Chris Masond1310b22008-01-24 16:13:08 -0500260int set_extent_buffer_uptodate(struct extent_io_tree *tree,
261 struct extent_buffer *eb);
Chris Mason1259ab72008-05-12 13:39:03 -0400262int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
263 struct extent_buffer *eb);
Chris Masond1310b22008-01-24 16:13:08 -0500264int extent_buffer_uptodate(struct extent_io_tree *tree,
265 struct extent_buffer *eb);
266int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
267 unsigned long min_len, char **token, char **map,
268 unsigned long *map_start,
269 unsigned long *map_len, int km);
270int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
271 unsigned long min_len, char **token, char **map,
272 unsigned long *map_start,
273 unsigned long *map_len, int km);
274void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
Chris Masonce9adaa2008-04-09 16:28:12 -0400275int release_extent_buffer_tail_pages(struct extent_buffer *eb);
276int extent_range_uptodate(struct extent_io_tree *tree,
277 u64 start, u64 end);
Chris Masonc8b97812008-10-29 14:49:59 -0400278int extent_clear_unlock_delalloc(struct inode *inode,
279 struct extent_io_tree *tree,
280 u64 start, u64 end, struct page *locked_page,
Chris Mason771ed682008-11-06 22:02:51 -0500281 int unlock_page,
282 int clear_unlock,
283 int clear_delalloc, int clear_dirty,
284 int set_writeback,
285 int end_writeback);
Chris Masond1310b22008-01-24 16:13:08 -0500286#endif