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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 Mason8b62b722009-09-02 16:53:46 -040016#define EXTENT_BOUNDARY (1 << 9)
17#define EXTENT_NODATASUM (1 << 10)
Josef Bacik32c00af2009-10-08 13:34:05 -040018#define EXTENT_DO_ACCOUNTING (1 << 11)
Yan, Zheng0ca1f7c2010-05-16 10:48:47 -040019#define EXTENT_FIRST_DELALLOC (1 << 12)
Chris Masond1310b22008-01-24 16:13:08 -050020#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
Yan, Zheng0ca1f7c2010-05-16 10:48:47 -040021#define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
Chris Masond1310b22008-01-24 16:13:08 -050022
Li Zefan261507a02010-12-17 14:21:50 +080023/*
24 * flags for bio submission. The high bits indicate the compression
25 * type for this bio
26 */
Chris Masonc8b97812008-10-29 14:49:59 -040027#define EXTENT_BIO_COMPRESSED 1
Li Zefan261507a02010-12-17 14:21:50 +080028#define EXTENT_BIO_FLAG_SHIFT 16
Chris Masonc8b97812008-10-29 14:49:59 -040029
Chris Masonb4ce94d2009-02-04 09:25:08 -050030/* these are bit numbers for test/set bit */
31#define EXTENT_BUFFER_UPTODATE 0
32#define EXTENT_BUFFER_BLOCKING 1
Chris Masonb9473432009-03-13 11:00:37 -040033#define EXTENT_BUFFER_DIRTY 2
Josef Bacika826d6d2011-03-16 13:42:43 -040034#define EXTENT_BUFFER_CORRUPT 3
Chris Masonb4ce94d2009-02-04 09:25:08 -050035
Chris Masona791e352009-10-08 11:27:10 -040036/* these are flags for extent_clear_unlock_delalloc */
37#define EXTENT_CLEAR_UNLOCK_PAGE 0x1
38#define EXTENT_CLEAR_UNLOCK 0x2
39#define EXTENT_CLEAR_DELALLOC 0x4
40#define EXTENT_CLEAR_DIRTY 0x8
41#define EXTENT_SET_WRITEBACK 0x10
42#define EXTENT_END_WRITEBACK 0x20
43#define EXTENT_SET_PRIVATE2 0x40
Josef Bacik32c00af2009-10-08 13:34:05 -040044#define EXTENT_CLEAR_ACCOUNTING 0x80
Chris Masona791e352009-10-08 11:27:10 -040045
Chris Masond1310b22008-01-24 16:13:08 -050046/*
47 * page->private values. Every page that is controlled by the extent
48 * map has page->private set to one.
49 */
50#define EXTENT_PAGE_PRIVATE 1
51#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
52
Chris Mason70dec802008-01-29 09:59:12 -050053struct extent_state;
54
Chris Mason44b8bd72008-04-16 11:14:51 -040055typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
Chris Masonc8b97812008-10-29 14:49:59 -040056 struct bio *bio, int mirror_num,
Chris Masoneaf25d92010-05-25 09:48:28 -040057 unsigned long bio_flags, u64 bio_offset);
Chris Masond1310b22008-01-24 16:13:08 -050058struct extent_io_ops {
Chris Masonc8b97812008-10-29 14:49:59 -040059 int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
Chris Mason771ed682008-11-06 22:02:51 -050060 u64 start, u64 end, int *page_started,
61 unsigned long *nr_written);
Chris Mason247e7432008-07-17 12:53:51 -040062 int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
Chris Masond1310b22008-01-24 16:13:08 -050063 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
Chris Mason44b8bd72008-04-16 11:14:51 -040064 extent_submit_bio_hook_t *submit_bio_hook;
Chris Mason239b14b2008-03-24 15:02:07 -040065 int (*merge_bio_hook)(struct page *page, unsigned long offset,
Chris Masonc8b97812008-10-29 14:49:59 -040066 size_t size, struct bio *bio,
67 unsigned long bio_flags);
Chris Masond1310b22008-01-24 16:13:08 -050068 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
Chris Mason7e383262008-04-09 16:28:12 -040069 int (*readpage_io_failed_hook)(struct bio *bio, struct page *page,
70 u64 start, u64 end,
71 struct extent_state *state);
Chris Mason1259ab72008-05-12 13:39:03 -040072 int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
73 u64 start, u64 end,
74 struct extent_state *state);
Chris Mason70dec802008-01-29 09:59:12 -050075 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
76 struct extent_state *state);
Chris Mason1259ab72008-05-12 13:39:03 -040077 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
Chris Masone6dcd2d2008-07-17 12:53:50 -040078 struct extent_state *state, int uptodate);
Jeff Mahoney1bf85042011-07-21 16:56:09 +000079 void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
80 int *bits);
81 void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
82 int *bits);
83 void (*merge_extent_hook)(struct inode *inode,
84 struct extent_state *new,
85 struct extent_state *other);
86 void (*split_extent_hook)(struct inode *inode,
87 struct extent_state *orig, u64 split);
Chris Mason4bef0842008-09-08 11:18:08 -040088 int (*write_cache_pages_lock_hook)(struct page *page);
Chris Masond1310b22008-01-24 16:13:08 -050089};
90
91struct extent_io_tree {
92 struct rb_root state;
Miao Xie19fe0a82010-10-26 20:57:29 -040093 struct radix_tree_root buffer;
Chris Masond1310b22008-01-24 16:13:08 -050094 struct address_space *mapping;
95 u64 dirty_bytes;
Chris Mason70dec802008-01-29 09:59:12 -050096 spinlock_t lock;
Chris Mason6af118c2008-07-22 11:18:07 -040097 spinlock_t buffer_lock;
Chris Masond1310b22008-01-24 16:13:08 -050098 struct extent_io_ops *ops;
Chris Masond1310b22008-01-24 16:13:08 -050099};
100
101struct extent_state {
102 u64 start;
103 u64 end; /* inclusive */
Chris Masond1310b22008-01-24 16:13:08 -0500104 struct rb_node rb_node;
Josef Bacik9ed74f22009-09-11 16:12:44 -0400105
106 /* ADD NEW ELEMENTS AFTER THIS */
Chris Mason70dec802008-01-29 09:59:12 -0500107 struct extent_io_tree *tree;
Chris Masond1310b22008-01-24 16:13:08 -0500108 wait_queue_head_t wq;
109 atomic_t refs;
110 unsigned long state;
111
112 /* for use by the FS */
113 u64 private;
114
Chris Mason2d2ae542008-03-26 16:24:23 -0400115 struct list_head leak_list;
Chris Masond1310b22008-01-24 16:13:08 -0500116};
117
118struct extent_buffer {
119 u64 start;
120 unsigned long len;
Chris Masond1310b22008-01-24 16:13:08 -0500121 unsigned long map_start;
122 unsigned long map_len;
123 struct page *first_page;
Chris Masonb4ce94d2009-02-04 09:25:08 -0500124 unsigned long bflags;
Chris Mason2d2ae542008-03-26 16:24:23 -0400125 struct list_head leak_list;
Miao Xie19fe0a82010-10-26 20:57:29 -0400126 struct rcu_head rcu_head;
richard kennedy9eb91042011-06-07 10:46:32 +0000127 atomic_t refs;
Chris Masonb4ce94d2009-02-04 09:25:08 -0500128
Chris Masonbd681512011-07-16 15:23:14 -0400129 /* count of read lock holders on the extent buffer */
130 atomic_t write_locks;
131 atomic_t read_locks;
132 atomic_t blocking_writers;
133 atomic_t blocking_readers;
134 atomic_t spinning_readers;
135 atomic_t spinning_writers;
Chris Masonb4ce94d2009-02-04 09:25:08 -0500136
Chris Masonbd681512011-07-16 15:23:14 -0400137 /* protects write locks */
138 rwlock_t lock;
139
140 /* readers use lock_wq while they wait for the write
141 * lock holders to unlock
Chris Masonb4ce94d2009-02-04 09:25:08 -0500142 */
Chris Masonbd681512011-07-16 15:23:14 -0400143 wait_queue_head_t write_lock_wq;
144
145 /* writers use read_lock_wq while they wait for readers
146 * to unlock
147 */
148 wait_queue_head_t read_lock_wq;
Chris Masond1310b22008-01-24 16:13:08 -0500149};
150
Li Zefan261507a02010-12-17 14:21:50 +0800151static inline void extent_set_compress_type(unsigned long *bio_flags,
152 int compress_type)
153{
154 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
155}
156
157static inline int extent_compress_type(unsigned long bio_flags)
158{
159 return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
160}
161
Chris Masond1310b22008-01-24 16:13:08 -0500162struct extent_map_tree;
163
164typedef struct extent_map *(get_extent_t)(struct inode *inode,
165 struct page *page,
David Sterba306e16c2011-04-19 14:29:38 +0200166 size_t pg_offset,
Chris Masond1310b22008-01-24 16:13:08 -0500167 u64 start, u64 len,
168 int create);
169
170void extent_io_tree_init(struct extent_io_tree *tree,
David Sterbaf993c882011-04-20 23:35:57 +0200171 struct address_space *mapping);
Chris Masond1310b22008-01-24 16:13:08 -0500172int try_release_extent_mapping(struct extent_map_tree *map,
Chris Mason70dec802008-01-29 09:59:12 -0500173 struct extent_io_tree *tree, struct page *page,
174 gfp_t mask);
Chris Mason6af118c2008-07-22 11:18:07 -0400175int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
Chris Mason7b13b7b2008-04-18 10:29:50 -0400176int try_release_extent_state(struct extent_map_tree *map,
177 struct extent_io_tree *tree, struct page *page,
178 gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500179int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
Chris Mason1edbb732009-09-02 13:24:36 -0400180int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
Chris Mason2c64c532009-09-02 15:04:12 -0400181 int bits, struct extent_state **cached, gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500182int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
Josef Bacik2ac55d42010-02-03 19:33:23 +0000183int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
184 struct extent_state **cached, gfp_t mask);
Josef Bacik25179202008-10-29 14:49:05 -0400185int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
186 gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500187int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
188 get_extent_t *get_extent);
189int __init extent_io_init(void);
190void extent_io_exit(void);
191
192u64 count_range_bits(struct extent_io_tree *tree,
193 u64 *start, u64 search_end,
Chris Masonec29ed52011-02-23 16:23:20 -0500194 u64 max_bytes, unsigned long bits, int contig);
Chris Masond1310b22008-01-24 16:13:08 -0500195
Chris Mason4845e442010-05-25 20:56:50 -0400196void free_extent_state(struct extent_state *state);
Chris Masond1310b22008-01-24 16:13:08 -0500197int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
Chris Mason9655d292009-09-02 15:22:30 -0400198 int bits, int filled, struct extent_state *cached_state);
Chris Masond1310b22008-01-24 16:13:08 -0500199int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
200 int bits, gfp_t mask);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400201int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
Chris Mason2c64c532009-09-02 15:04:12 -0400202 int bits, int wake, int delete, struct extent_state **cached,
203 gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500204int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
205 int bits, gfp_t mask);
Chris Mason4845e442010-05-25 20:56:50 -0400206int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
207 int bits, int exclusive_bits, u64 *failed_start,
208 struct extent_state **cached_state, gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500209int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
Arne Jansen507903b2011-04-06 10:02:20 +0000210 struct extent_state **cached_state, gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500211int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
212 gfp_t mask);
213int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
214 gfp_t mask);
215int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
216 gfp_t mask);
217int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
Josef Bacik2ac55d42010-02-03 19:33:23 +0000218 struct extent_state **cached_state, gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500219int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
220 u64 *start_ret, u64 *end_ret, int bits);
Chris Masond7fc6402008-02-18 12:12:38 -0500221struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
222 u64 start, int bits);
Chris Masond1310b22008-01-24 16:13:08 -0500223int extent_invalidatepage(struct extent_io_tree *tree,
224 struct page *page, unsigned long offset);
225int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
226 get_extent_t *get_extent,
227 struct writeback_control *wbc);
Chris Mason771ed682008-11-06 22:02:51 -0500228int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
229 u64 start, u64 end, get_extent_t *get_extent,
230 int mode);
Chris Masond1310b22008-01-24 16:13:08 -0500231int extent_writepages(struct extent_io_tree *tree,
232 struct address_space *mapping,
233 get_extent_t *get_extent,
234 struct writeback_control *wbc);
235int extent_readpages(struct extent_io_tree *tree,
236 struct address_space *mapping,
237 struct list_head *pages, unsigned nr_pages,
238 get_extent_t get_extent);
Yehuda Sadeh1506fcc2009-01-21 14:39:14 -0500239int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
240 __u64 start, __u64 len, get_extent_t *get_extent);
Chris Masond1310b22008-01-24 16:13:08 -0500241int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
242int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
243void set_page_extent_mapped(struct page *page);
244
245struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
246 u64 start, unsigned long len,
David Sterbaba144192011-04-21 01:12:06 +0200247 struct page *page0);
Chris Masond1310b22008-01-24 16:13:08 -0500248struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
David Sterbaf09d1f62011-04-21 01:08:01 +0200249 u64 start, unsigned long len);
Chris Masond1310b22008-01-24 16:13:08 -0500250void free_extent_buffer(struct extent_buffer *eb);
251int read_extent_buffer_pages(struct extent_io_tree *tree,
Chris Masona86c12c2008-02-07 10:50:54 -0500252 struct extent_buffer *eb, u64 start, int wait,
Chris Masonf1885912008-04-09 16:28:12 -0400253 get_extent_t *get_extent, int mirror_num);
Chris Masond1310b22008-01-24 16:13:08 -0500254
255static inline void extent_buffer_get(struct extent_buffer *eb)
256{
257 atomic_inc(&eb->refs);
258}
259
260int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
261 unsigned long start,
262 unsigned long len);
263void read_extent_buffer(struct extent_buffer *eb, void *dst,
264 unsigned long start,
265 unsigned long len);
266void write_extent_buffer(struct extent_buffer *eb, const void *src,
267 unsigned long start, unsigned long len);
268void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
269 unsigned long dst_offset, unsigned long src_offset,
270 unsigned long len);
271void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
272 unsigned long src_offset, unsigned long len);
273void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
274 unsigned long src_offset, unsigned long len);
275void memset_extent_buffer(struct extent_buffer *eb, char c,
276 unsigned long start, unsigned long len);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400277int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
Chris Masond1310b22008-01-24 16:13:08 -0500278int clear_extent_buffer_dirty(struct extent_io_tree *tree,
279 struct extent_buffer *eb);
280int set_extent_buffer_dirty(struct extent_io_tree *tree,
281 struct extent_buffer *eb);
282int set_extent_buffer_uptodate(struct extent_io_tree *tree,
283 struct extent_buffer *eb);
Chris Mason1259ab72008-05-12 13:39:03 -0400284int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
Josef Bacik2ac55d42010-02-03 19:33:23 +0000285 struct extent_buffer *eb,
286 struct extent_state **cached_state);
Chris Masond1310b22008-01-24 16:13:08 -0500287int extent_buffer_uptodate(struct extent_io_tree *tree,
Josef Bacik2ac55d42010-02-03 19:33:23 +0000288 struct extent_buffer *eb,
289 struct extent_state *cached_state);
Chris Masond1310b22008-01-24 16:13:08 -0500290int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
Chris Masona6591712011-07-19 12:04:14 -0400291 unsigned long min_len, char **map,
Chris Masond1310b22008-01-24 16:13:08 -0500292 unsigned long *map_start,
Chris Masona6591712011-07-19 12:04:14 -0400293 unsigned long *map_len);
Chris Masonce9adaa2008-04-09 16:28:12 -0400294int extent_range_uptodate(struct extent_io_tree *tree,
295 u64 start, u64 end);
Chris Masonc8b97812008-10-29 14:49:59 -0400296int extent_clear_unlock_delalloc(struct inode *inode,
297 struct extent_io_tree *tree,
298 u64 start, u64 end, struct page *locked_page,
Chris Masona791e352009-10-08 11:27:10 -0400299 unsigned long op);
Miao Xie88f794e2010-11-22 03:02:55 +0000300struct bio *
301btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
302 gfp_t gfp_flags);
Chris Masond1310b22008-01-24 16:13:08 -0500303#endif