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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)
Josef Bacik17283662011-09-26 13:58:47 -040020#define EXTENT_NEED_WAIT (1 << 13)
Chris Mason806468f2011-11-06 03:07:10 -050021#define EXTENT_DAMAGED (1 << 14)
Chris Masond1310b22008-01-24 16:13:08 -050022#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
Yan, Zheng0ca1f7c2010-05-16 10:48:47 -040023#define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
Chris Masond1310b22008-01-24 16:13:08 -050024
Li Zefan261507a02010-12-17 14:21:50 +080025/*
26 * flags for bio submission. The high bits indicate the compression
27 * type for this bio
28 */
Chris Masonc8b97812008-10-29 14:49:59 -040029#define EXTENT_BIO_COMPRESSED 1
Li Zefan261507a02010-12-17 14:21:50 +080030#define EXTENT_BIO_FLAG_SHIFT 16
Chris Masonc8b97812008-10-29 14:49:59 -040031
Chris Masonb4ce94d2009-02-04 09:25:08 -050032/* these are bit numbers for test/set bit */
33#define EXTENT_BUFFER_UPTODATE 0
34#define EXTENT_BUFFER_BLOCKING 1
Chris Masonb9473432009-03-13 11:00:37 -040035#define EXTENT_BUFFER_DIRTY 2
Josef Bacika826d6d2011-03-16 13:42:43 -040036#define EXTENT_BUFFER_CORRUPT 3
Arne Jansenab0fff02011-05-23 14:25:41 +020037#define EXTENT_BUFFER_READAHEAD 4 /* this got triggered by readahead */
Chris Masonb4ce94d2009-02-04 09:25:08 -050038
Chris Masona791e352009-10-08 11:27:10 -040039/* these are flags for extent_clear_unlock_delalloc */
40#define EXTENT_CLEAR_UNLOCK_PAGE 0x1
41#define EXTENT_CLEAR_UNLOCK 0x2
42#define EXTENT_CLEAR_DELALLOC 0x4
43#define EXTENT_CLEAR_DIRTY 0x8
44#define EXTENT_SET_WRITEBACK 0x10
45#define EXTENT_END_WRITEBACK 0x20
46#define EXTENT_SET_PRIVATE2 0x40
Josef Bacik32c00af2009-10-08 13:34:05 -040047#define EXTENT_CLEAR_ACCOUNTING 0x80
Chris Masona791e352009-10-08 11:27:10 -040048
Chris Masond1310b22008-01-24 16:13:08 -050049/*
50 * page->private values. Every page that is controlled by the extent
51 * map has page->private set to one.
52 */
53#define EXTENT_PAGE_PRIVATE 1
54#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
55
Chris Mason70dec802008-01-29 09:59:12 -050056struct extent_state;
57
Chris Mason44b8bd72008-04-16 11:14:51 -040058typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
Chris Masonc8b97812008-10-29 14:49:59 -040059 struct bio *bio, int mirror_num,
Chris Masoneaf25d92010-05-25 09:48:28 -040060 unsigned long bio_flags, u64 bio_offset);
Chris Masond1310b22008-01-24 16:13:08 -050061struct extent_io_ops {
Chris Masonc8b97812008-10-29 14:49:59 -040062 int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
Chris Mason771ed682008-11-06 22:02:51 -050063 u64 start, u64 end, int *page_started,
64 unsigned long *nr_written);
Chris Mason247e7432008-07-17 12:53:51 -040065 int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
Chris Masond1310b22008-01-24 16:13:08 -050066 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
Chris Mason44b8bd72008-04-16 11:14:51 -040067 extent_submit_bio_hook_t *submit_bio_hook;
Chris Mason239b14b2008-03-24 15:02:07 -040068 int (*merge_bio_hook)(struct page *page, unsigned long offset,
Chris Masonc8b97812008-10-29 14:49:59 -040069 size_t size, struct bio *bio,
70 unsigned long bio_flags);
Chris Masond1310b22008-01-24 16:13:08 -050071 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
Chris Mason7e383262008-04-09 16:28:12 -040072 int (*readpage_io_failed_hook)(struct bio *bio, struct page *page,
Jan Schmidt32240a92011-11-20 07:33:38 -050073 u64 start, u64 end, int failed_mirror,
Chris Mason7e383262008-04-09 16:28:12 -040074 struct extent_state *state);
Chris Mason1259ab72008-05-12 13:39:03 -040075 int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
76 u64 start, u64 end,
77 struct extent_state *state);
Chris Mason70dec802008-01-29 09:59:12 -050078 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
79 struct extent_state *state);
Chris Mason1259ab72008-05-12 13:39:03 -040080 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
Chris Masone6dcd2d2008-07-17 12:53:50 -040081 struct extent_state *state, int uptodate);
Jeff Mahoney1bf85042011-07-21 16:56:09 +000082 void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
83 int *bits);
84 void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
85 int *bits);
86 void (*merge_extent_hook)(struct inode *inode,
87 struct extent_state *new,
88 struct extent_state *other);
89 void (*split_extent_hook)(struct inode *inode,
90 struct extent_state *orig, u64 split);
Chris Mason01d658f2011-11-01 10:08:06 -040091 int (*write_cache_pages_lock_hook)(struct page *page, void *data,
92 void (*flush_fn)(void *));
Chris Masond1310b22008-01-24 16:13:08 -050093};
94
95struct extent_io_tree {
96 struct rb_root state;
Miao Xie19fe0a82010-10-26 20:57:29 -040097 struct radix_tree_root buffer;
Chris Masond1310b22008-01-24 16:13:08 -050098 struct address_space *mapping;
99 u64 dirty_bytes;
Chris Mason70dec802008-01-29 09:59:12 -0500100 spinlock_t lock;
Chris Mason6af118ce2008-07-22 11:18:07 -0400101 spinlock_t buffer_lock;
Chris Masond1310b22008-01-24 16:13:08 -0500102 struct extent_io_ops *ops;
Chris Masond1310b22008-01-24 16:13:08 -0500103};
104
105struct extent_state {
106 u64 start;
107 u64 end; /* inclusive */
Chris Masond1310b22008-01-24 16:13:08 -0500108 struct rb_node rb_node;
Josef Bacik9ed74f22009-09-11 16:12:44 -0400109
110 /* ADD NEW ELEMENTS AFTER THIS */
Chris Mason70dec802008-01-29 09:59:12 -0500111 struct extent_io_tree *tree;
Chris Masond1310b22008-01-24 16:13:08 -0500112 wait_queue_head_t wq;
113 atomic_t refs;
114 unsigned long state;
115
116 /* for use by the FS */
117 u64 private;
118
Chris Mason2d2ae542008-03-26 16:24:23 -0400119 struct list_head leak_list;
Chris Masond1310b22008-01-24 16:13:08 -0500120};
121
122struct extent_buffer {
123 u64 start;
124 unsigned long len;
Chris Masond1310b22008-01-24 16:13:08 -0500125 unsigned long map_start;
126 unsigned long map_len;
127 struct page *first_page;
Chris Masonb4ce94d2009-02-04 09:25:08 -0500128 unsigned long bflags;
Chris Mason2d2ae542008-03-26 16:24:23 -0400129 struct list_head leak_list;
Miao Xie19fe0a82010-10-26 20:57:29 -0400130 struct rcu_head rcu_head;
richard kennedy9eb91042011-06-07 10:46:32 +0000131 atomic_t refs;
Arne Jansen5b25f702011-09-13 10:55:48 +0200132 pid_t lock_owner;
Chris Masonb4ce94d2009-02-04 09:25:08 -0500133
Chris Masonbd681512011-07-16 15:23:14 -0400134 /* count of read lock holders on the extent buffer */
135 atomic_t write_locks;
136 atomic_t read_locks;
137 atomic_t blocking_writers;
138 atomic_t blocking_readers;
139 atomic_t spinning_readers;
140 atomic_t spinning_writers;
Arne Jansen5b25f702011-09-13 10:55:48 +0200141 int lock_nested;
Chris Masonb4ce94d2009-02-04 09:25:08 -0500142
Chris Masonbd681512011-07-16 15:23:14 -0400143 /* protects write locks */
144 rwlock_t lock;
145
146 /* readers use lock_wq while they wait for the write
147 * lock holders to unlock
Chris Masonb4ce94d2009-02-04 09:25:08 -0500148 */
Chris Masonbd681512011-07-16 15:23:14 -0400149 wait_queue_head_t write_lock_wq;
150
151 /* writers use read_lock_wq while they wait for readers
152 * to unlock
153 */
154 wait_queue_head_t read_lock_wq;
Chris Masond1310b22008-01-24 16:13:08 -0500155};
156
Li Zefan261507a02010-12-17 14:21:50 +0800157static inline void extent_set_compress_type(unsigned long *bio_flags,
158 int compress_type)
159{
160 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
161}
162
163static inline int extent_compress_type(unsigned long bio_flags)
164{
165 return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
166}
167
Chris Masond1310b22008-01-24 16:13:08 -0500168struct extent_map_tree;
169
170typedef struct extent_map *(get_extent_t)(struct inode *inode,
171 struct page *page,
David Sterba306e16c2011-04-19 14:29:38 +0200172 size_t pg_offset,
Chris Masond1310b22008-01-24 16:13:08 -0500173 u64 start, u64 len,
174 int create);
175
176void extent_io_tree_init(struct extent_io_tree *tree,
David Sterbaf993c882011-04-20 23:35:57 +0200177 struct address_space *mapping);
Chris Masond1310b22008-01-24 16:13:08 -0500178int try_release_extent_mapping(struct extent_map_tree *map,
Chris Mason70dec802008-01-29 09:59:12 -0500179 struct extent_io_tree *tree, struct page *page,
180 gfp_t mask);
Chris Mason6af118ce2008-07-22 11:18:07 -0400181int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
Chris Mason7b13b7b2008-04-18 10:29:50 -0400182int try_release_extent_state(struct extent_map_tree *map,
183 struct extent_io_tree *tree, struct page *page,
184 gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500185int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
Chris Mason1edbb732009-09-02 13:24:36 -0400186int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
Chris Mason2c64c532009-09-02 15:04:12 -0400187 int bits, struct extent_state **cached, gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500188int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
Josef Bacik2ac55d42010-02-03 19:33:23 +0000189int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
190 struct extent_state **cached, gfp_t mask);
Josef Bacik25179202008-10-29 14:49:05 -0400191int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
192 gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500193int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
Jan Schmidt8ddc7d92011-06-13 20:02:58 +0200194 get_extent_t *get_extent, int mirror_num);
Chris Masond1310b22008-01-24 16:13:08 -0500195int __init extent_io_init(void);
196void extent_io_exit(void);
197
198u64 count_range_bits(struct extent_io_tree *tree,
199 u64 *start, u64 search_end,
Chris Masonec29ed52011-02-23 16:23:20 -0500200 u64 max_bytes, unsigned long bits, int contig);
Chris Masond1310b22008-01-24 16:13:08 -0500201
Chris Mason4845e442010-05-25 20:56:50 -0400202void free_extent_state(struct extent_state *state);
Chris Masond1310b22008-01-24 16:13:08 -0500203int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
Chris Mason9655d292009-09-02 15:22:30 -0400204 int bits, int filled, struct extent_state *cached_state);
Chris Masond1310b22008-01-24 16:13:08 -0500205int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
206 int bits, gfp_t mask);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400207int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
Chris Mason2c64c532009-09-02 15:04:12 -0400208 int bits, int wake, int delete, struct extent_state **cached,
209 gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500210int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
211 int bits, gfp_t mask);
Chris Mason4845e442010-05-25 20:56:50 -0400212int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
213 int bits, int exclusive_bits, u64 *failed_start,
214 struct extent_state **cached_state, gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500215int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
Arne Jansen507903b2011-04-06 10:02:20 +0000216 struct extent_state **cached_state, gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500217int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
218 gfp_t mask);
219int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
220 gfp_t mask);
221int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
222 gfp_t mask);
Josef Bacik462d6fa2011-09-26 13:56:12 -0400223int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
224 int bits, int clear_bits, gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500225int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
Josef Bacik2ac55d42010-02-03 19:33:23 +0000226 struct extent_state **cached_state, gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500227int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
228 u64 *start_ret, u64 *end_ret, int bits);
Chris Masond7fc6402008-02-18 12:12:38 -0500229struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
230 u64 start, int bits);
Chris Masond1310b22008-01-24 16:13:08 -0500231int extent_invalidatepage(struct extent_io_tree *tree,
232 struct page *page, unsigned long offset);
233int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
234 get_extent_t *get_extent,
235 struct writeback_control *wbc);
Chris Mason771ed682008-11-06 22:02:51 -0500236int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
237 u64 start, u64 end, get_extent_t *get_extent,
238 int mode);
Chris Masond1310b22008-01-24 16:13:08 -0500239int extent_writepages(struct extent_io_tree *tree,
240 struct address_space *mapping,
241 get_extent_t *get_extent,
242 struct writeback_control *wbc);
243int extent_readpages(struct extent_io_tree *tree,
244 struct address_space *mapping,
245 struct list_head *pages, unsigned nr_pages,
246 get_extent_t get_extent);
Yehuda Sadeh1506fcc2009-01-21 14:39:14 -0500247int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
248 __u64 start, __u64 len, get_extent_t *get_extent);
Chris Masond1310b22008-01-24 16:13:08 -0500249int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
250int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
251void set_page_extent_mapped(struct page *page);
252
253struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
254 u64 start, unsigned long len,
David Sterbaba144192011-04-21 01:12:06 +0200255 struct page *page0);
Chris Masond1310b22008-01-24 16:13:08 -0500256struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
David Sterbaf09d1f62011-04-21 01:08:01 +0200257 u64 start, unsigned long len);
Chris Masond1310b22008-01-24 16:13:08 -0500258void free_extent_buffer(struct extent_buffer *eb);
Arne Jansenbb82ab82011-06-10 14:06:53 +0200259#define WAIT_NONE 0
260#define WAIT_COMPLETE 1
261#define WAIT_PAGE_LOCK 2
Chris Masond1310b22008-01-24 16:13:08 -0500262int read_extent_buffer_pages(struct extent_io_tree *tree,
Chris Masona86c12c2008-02-07 10:50:54 -0500263 struct extent_buffer *eb, u64 start, int wait,
Chris Masonf1885912008-04-09 16:28:12 -0400264 get_extent_t *get_extent, int mirror_num);
Jan Schmidt4a54c8c2011-07-22 15:41:52 +0200265unsigned long num_extent_pages(u64 start, u64 len);
266struct page *extent_buffer_page(struct extent_buffer *eb, unsigned long i);
Chris Masond1310b22008-01-24 16:13:08 -0500267
268static inline void extent_buffer_get(struct extent_buffer *eb)
269{
270 atomic_inc(&eb->refs);
271}
272
273int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
274 unsigned long start,
275 unsigned long len);
276void read_extent_buffer(struct extent_buffer *eb, void *dst,
277 unsigned long start,
278 unsigned long len);
279void write_extent_buffer(struct extent_buffer *eb, const void *src,
280 unsigned long start, unsigned long len);
281void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
282 unsigned long dst_offset, unsigned long src_offset,
283 unsigned long len);
284void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
285 unsigned long src_offset, unsigned long len);
286void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
287 unsigned long src_offset, unsigned long len);
288void memset_extent_buffer(struct extent_buffer *eb, char c,
289 unsigned long start, unsigned long len);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400290int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
Chris Masond1310b22008-01-24 16:13:08 -0500291int clear_extent_buffer_dirty(struct extent_io_tree *tree,
292 struct extent_buffer *eb);
293int set_extent_buffer_dirty(struct extent_io_tree *tree,
294 struct extent_buffer *eb);
295int set_extent_buffer_uptodate(struct extent_io_tree *tree,
296 struct extent_buffer *eb);
Chris Mason1259ab72008-05-12 13:39:03 -0400297int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
Josef Bacik2ac55d42010-02-03 19:33:23 +0000298 struct extent_buffer *eb,
299 struct extent_state **cached_state);
Chris Masond1310b22008-01-24 16:13:08 -0500300int extent_buffer_uptodate(struct extent_io_tree *tree,
Josef Bacik2ac55d42010-02-03 19:33:23 +0000301 struct extent_buffer *eb,
302 struct extent_state *cached_state);
Chris Masond1310b22008-01-24 16:13:08 -0500303int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
Chris Masona6591712011-07-19 12:04:14 -0400304 unsigned long min_len, char **map,
Chris Masond1310b22008-01-24 16:13:08 -0500305 unsigned long *map_start,
Chris Masona6591712011-07-19 12:04:14 -0400306 unsigned long *map_len);
Chris Masonce9adaa2008-04-09 16:28:12 -0400307int extent_range_uptodate(struct extent_io_tree *tree,
308 u64 start, u64 end);
Chris Masonc8b97812008-10-29 14:49:59 -0400309int extent_clear_unlock_delalloc(struct inode *inode,
310 struct extent_io_tree *tree,
311 u64 start, u64 end, struct page *locked_page,
Chris Masona791e352009-10-08 11:27:10 -0400312 unsigned long op);
Miao Xie88f794e2010-11-22 03:02:55 +0000313struct bio *
314btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
315 gfp_t gfp_flags);
Jan Schmidt4a54c8c2011-07-22 15:41:52 +0200316
317struct btrfs_mapping_tree;
318
319int repair_io_failure(struct btrfs_mapping_tree *map_tree, u64 start,
320 u64 length, u64 logical, struct page *page,
321 int mirror_num);
Jeff Mahoney87826df2012-02-15 16:23:57 +0100322int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
Chris Masond1310b22008-01-24 16:13:08 -0500323#endif