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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 Mason6af118ce2008-07-22 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;
Josef Bacik9ed74f22009-09-11 16:12:44 -0400111 u64 split_start;
112 u64 split_end;
Chris Masond1310b22008-01-24 16:13:08 -0500113
114 /* for use by the FS */
115 u64 private;
116
Chris Mason2d2ae542008-03-26 16:24:23 -0400117 struct list_head leak_list;
Chris Masond1310b22008-01-24 16:13:08 -0500118};
119
120struct extent_buffer {
121 u64 start;
122 unsigned long len;
Chris Masond1310b22008-01-24 16:13:08 -0500123 unsigned long map_start;
124 unsigned long map_len;
125 struct page *first_page;
Chris Masonb4ce94d2009-02-04 09:25:08 -0500126 unsigned long bflags;
Chris Mason2d2ae542008-03-26 16:24:23 -0400127 struct list_head leak_list;
Miao Xie19fe0a82010-10-26 20:57:29 -0400128 struct rcu_head rcu_head;
richard kennedy9eb91042011-06-07 10:46:32 +0000129 atomic_t refs;
Chris Masonb4ce94d2009-02-04 09:25:08 -0500130
Chris Masonbd681512011-07-16 15:23:14 -0400131 /* count of read lock holders on the extent buffer */
132 atomic_t write_locks;
133 atomic_t read_locks;
134 atomic_t blocking_writers;
135 atomic_t blocking_readers;
136 atomic_t spinning_readers;
137 atomic_t spinning_writers;
Chris Masonb4ce94d2009-02-04 09:25:08 -0500138
Chris Masonbd681512011-07-16 15:23:14 -0400139 /* protects write locks */
140 rwlock_t lock;
141
142 /* readers use lock_wq while they wait for the write
143 * lock holders to unlock
Chris Masonb4ce94d2009-02-04 09:25:08 -0500144 */
Chris Masonbd681512011-07-16 15:23:14 -0400145 wait_queue_head_t write_lock_wq;
146
147 /* writers use read_lock_wq while they wait for readers
148 * to unlock
149 */
150 wait_queue_head_t read_lock_wq;
Chris Masond1310b22008-01-24 16:13:08 -0500151};
152
Li Zefan261507a02010-12-17 14:21:50 +0800153static inline void extent_set_compress_type(unsigned long *bio_flags,
154 int compress_type)
155{
156 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
157}
158
159static inline int extent_compress_type(unsigned long bio_flags)
160{
161 return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
162}
163
Chris Masond1310b22008-01-24 16:13:08 -0500164struct extent_map_tree;
165
166typedef struct extent_map *(get_extent_t)(struct inode *inode,
167 struct page *page,
David Sterba306e16c2011-04-19 14:29:38 +0200168 size_t pg_offset,
Chris Masond1310b22008-01-24 16:13:08 -0500169 u64 start, u64 len,
170 int create);
171
172void extent_io_tree_init(struct extent_io_tree *tree,
David Sterbaf993c882011-04-20 23:35:57 +0200173 struct address_space *mapping);
Chris Masond1310b22008-01-24 16:13:08 -0500174int try_release_extent_mapping(struct extent_map_tree *map,
Chris Mason70dec802008-01-29 09:59:12 -0500175 struct extent_io_tree *tree, struct page *page,
176 gfp_t mask);
Chris Mason6af118ce2008-07-22 11:18:07 -0400177int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
Chris Mason7b13b7b2008-04-18 10:29:50 -0400178int try_release_extent_state(struct extent_map_tree *map,
179 struct extent_io_tree *tree, struct page *page,
180 gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500181int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
Chris Mason1edbb732009-09-02 13:24:36 -0400182int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
Chris Mason2c64c532009-09-02 15:04:12 -0400183 int bits, struct extent_state **cached, gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500184int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
Josef Bacik2ac55d42010-02-03 19:33:23 +0000185int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
186 struct extent_state **cached, gfp_t mask);
Josef Bacik25179202008-10-29 14:49:05 -0400187int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
188 gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500189int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
190 get_extent_t *get_extent);
191int __init extent_io_init(void);
192void extent_io_exit(void);
193
194u64 count_range_bits(struct extent_io_tree *tree,
195 u64 *start, u64 search_end,
Chris Masonec29ed52011-02-23 16:23:20 -0500196 u64 max_bytes, unsigned long bits, int contig);
Chris Masond1310b22008-01-24 16:13:08 -0500197
Chris Mason4845e442010-05-25 20:56:50 -0400198void free_extent_state(struct extent_state *state);
Chris Masond1310b22008-01-24 16:13:08 -0500199int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
Chris Mason9655d292009-09-02 15:22:30 -0400200 int bits, int filled, struct extent_state *cached_state);
Chris Masond1310b22008-01-24 16:13:08 -0500201int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
202 int bits, gfp_t mask);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400203int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
Chris Mason2c64c532009-09-02 15:04:12 -0400204 int bits, int wake, int delete, struct extent_state **cached,
205 gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500206int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
207 int bits, gfp_t mask);
Chris Mason4845e442010-05-25 20:56:50 -0400208int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
209 int bits, int exclusive_bits, u64 *failed_start,
210 struct extent_state **cached_state, gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500211int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
Arne Jansen507903b2011-04-06 10:02:20 +0000212 struct extent_state **cached_state, gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500213int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
214 gfp_t mask);
215int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
216 gfp_t mask);
217int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
218 gfp_t mask);
219int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
Josef Bacik2ac55d42010-02-03 19:33:23 +0000220 struct extent_state **cached_state, gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500221int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
222 u64 *start_ret, u64 *end_ret, int bits);
Chris Masond7fc6402008-02-18 12:12:38 -0500223struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
224 u64 start, int bits);
Chris Masond1310b22008-01-24 16:13:08 -0500225int extent_invalidatepage(struct extent_io_tree *tree,
226 struct page *page, unsigned long offset);
227int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
228 get_extent_t *get_extent,
229 struct writeback_control *wbc);
Chris Mason771ed682008-11-06 22:02:51 -0500230int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
231 u64 start, u64 end, get_extent_t *get_extent,
232 int mode);
Chris Masond1310b22008-01-24 16:13:08 -0500233int extent_writepages(struct extent_io_tree *tree,
234 struct address_space *mapping,
235 get_extent_t *get_extent,
236 struct writeback_control *wbc);
237int extent_readpages(struct extent_io_tree *tree,
238 struct address_space *mapping,
239 struct list_head *pages, unsigned nr_pages,
240 get_extent_t get_extent);
Yehuda Sadeh1506fcc2009-01-21 14:39:14 -0500241int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
242 __u64 start, __u64 len, get_extent_t *get_extent);
Chris Masond1310b22008-01-24 16:13:08 -0500243int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
244int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
245void set_page_extent_mapped(struct page *page);
246
247struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
248 u64 start, unsigned long len,
David Sterbaba144192011-04-21 01:12:06 +0200249 struct page *page0);
Chris Masond1310b22008-01-24 16:13:08 -0500250struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
David Sterbaf09d1f62011-04-21 01:08:01 +0200251 u64 start, unsigned long len);
Chris Masond1310b22008-01-24 16:13:08 -0500252void free_extent_buffer(struct extent_buffer *eb);
253int read_extent_buffer_pages(struct extent_io_tree *tree,
Chris Masona86c12c2008-02-07 10:50:54 -0500254 struct extent_buffer *eb, u64 start, int wait,
Chris Masonf1885912008-04-09 16:28:12 -0400255 get_extent_t *get_extent, int mirror_num);
Chris Masond1310b22008-01-24 16:13:08 -0500256
257static inline void extent_buffer_get(struct extent_buffer *eb)
258{
259 atomic_inc(&eb->refs);
260}
261
262int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
263 unsigned long start,
264 unsigned long len);
265void read_extent_buffer(struct extent_buffer *eb, void *dst,
266 unsigned long start,
267 unsigned long len);
268void write_extent_buffer(struct extent_buffer *eb, const void *src,
269 unsigned long start, unsigned long len);
270void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
271 unsigned long dst_offset, unsigned long src_offset,
272 unsigned long len);
273void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
274 unsigned long src_offset, unsigned long len);
275void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
276 unsigned long src_offset, unsigned long len);
277void memset_extent_buffer(struct extent_buffer *eb, char c,
278 unsigned long start, unsigned long len);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400279int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
Chris Masond1310b22008-01-24 16:13:08 -0500280int clear_extent_buffer_dirty(struct extent_io_tree *tree,
281 struct extent_buffer *eb);
282int set_extent_buffer_dirty(struct extent_io_tree *tree,
283 struct extent_buffer *eb);
284int set_extent_buffer_uptodate(struct extent_io_tree *tree,
285 struct extent_buffer *eb);
Chris Mason1259ab72008-05-12 13:39:03 -0400286int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
Josef Bacik2ac55d42010-02-03 19:33:23 +0000287 struct extent_buffer *eb,
288 struct extent_state **cached_state);
Chris Masond1310b22008-01-24 16:13:08 -0500289int extent_buffer_uptodate(struct extent_io_tree *tree,
Josef Bacik2ac55d42010-02-03 19:33:23 +0000290 struct extent_buffer *eb,
291 struct extent_state *cached_state);
Chris Masond1310b22008-01-24 16:13:08 -0500292int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
Chris Masona6591712011-07-19 12:04:14 -0400293 unsigned long min_len, char **map,
Chris Masond1310b22008-01-24 16:13:08 -0500294 unsigned long *map_start,
Chris Masona6591712011-07-19 12:04:14 -0400295 unsigned long *map_len);
Chris Masonce9adaa2008-04-09 16:28:12 -0400296int extent_range_uptodate(struct extent_io_tree *tree,
297 u64 start, u64 end);
Chris Masonc8b97812008-10-29 14:49:59 -0400298int extent_clear_unlock_delalloc(struct inode *inode,
299 struct extent_io_tree *tree,
300 u64 start, u64 end, struct page *locked_page,
Chris Masona791e352009-10-08 11:27:10 -0400301 unsigned long op);
Miao Xie88f794e2010-11-22 03:02:55 +0000302struct bio *
303btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
304 gfp_t gfp_flags);
Chris Masond1310b22008-01-24 16:13:08 -0500305#endif