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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 */
Josef Bacik3083ee22012-03-09 16:01:49 -050038#define EXTENT_BUFFER_TREE_REF 5
39#define EXTENT_BUFFER_STALE 6
Josef Bacik0b32f4b2012-03-13 09:38:00 -040040#define EXTENT_BUFFER_WRITEBACK 7
41#define EXTENT_BUFFER_IOERR 8
Chris Masonb4ce94d2009-02-04 09:25:08 -050042
Chris Masona791e352009-10-08 11:27:10 -040043/* these are flags for extent_clear_unlock_delalloc */
44#define EXTENT_CLEAR_UNLOCK_PAGE 0x1
45#define EXTENT_CLEAR_UNLOCK 0x2
46#define EXTENT_CLEAR_DELALLOC 0x4
47#define EXTENT_CLEAR_DIRTY 0x8
48#define EXTENT_SET_WRITEBACK 0x10
49#define EXTENT_END_WRITEBACK 0x20
50#define EXTENT_SET_PRIVATE2 0x40
Josef Bacik32c00af2009-10-08 13:34:05 -040051#define EXTENT_CLEAR_ACCOUNTING 0x80
Chris Masona791e352009-10-08 11:27:10 -040052
Chris Masond1310b22008-01-24 16:13:08 -050053/*
54 * page->private values. Every page that is controlled by the extent
55 * map has page->private set to one.
56 */
57#define EXTENT_PAGE_PRIVATE 1
58#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
59
Chris Mason70dec802008-01-29 09:59:12 -050060struct extent_state;
Josef Bacikea466792012-03-26 21:57:36 -040061struct btrfs_root;
Chris Mason70dec802008-01-29 09:59:12 -050062
Chris Mason44b8bd72008-04-16 11:14:51 -040063typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
Chris Masonc8b97812008-10-29 14:49:59 -040064 struct bio *bio, int mirror_num,
Chris Masoneaf25d92010-05-25 09:48:28 -040065 unsigned long bio_flags, u64 bio_offset);
Chris Masond1310b22008-01-24 16:13:08 -050066struct extent_io_ops {
Chris Masonc8b97812008-10-29 14:49:59 -040067 int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
Chris Mason771ed682008-11-06 22:02:51 -050068 u64 start, u64 end, int *page_started,
69 unsigned long *nr_written);
Chris Mason247e7432008-07-17 12:53:51 -040070 int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
Chris Masond1310b22008-01-24 16:13:08 -050071 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
Chris Mason44b8bd72008-04-16 11:14:51 -040072 extent_submit_bio_hook_t *submit_bio_hook;
Chris Mason239b14b2008-03-24 15:02:07 -040073 int (*merge_bio_hook)(struct page *page, unsigned long offset,
Chris Masonc8b97812008-10-29 14:49:59 -040074 size_t size, struct bio *bio,
75 unsigned long bio_flags);
Chris Masond1310b22008-01-24 16:13:08 -050076 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
Josef Bacikea466792012-03-26 21:57:36 -040077 int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
Chris Mason1259ab72008-05-12 13:39:03 -040078 int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
79 u64 start, u64 end,
80 struct extent_state *state);
Chris Mason70dec802008-01-29 09:59:12 -050081 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
82 struct extent_state *state);
Chris Mason1259ab72008-05-12 13:39:03 -040083 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
Chris Masone6dcd2d2008-07-17 12:53:50 -040084 struct extent_state *state, int uptodate);
Jeff Mahoney1bf85042011-07-21 16:56:09 +000085 void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
86 int *bits);
87 void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
88 int *bits);
89 void (*merge_extent_hook)(struct inode *inode,
90 struct extent_state *new,
91 struct extent_state *other);
92 void (*split_extent_hook)(struct inode *inode,
93 struct extent_state *orig, u64 split);
Chris Mason01d658f2011-11-01 10:08:06 -040094 int (*write_cache_pages_lock_hook)(struct page *page, void *data,
95 void (*flush_fn)(void *));
Chris Masond1310b22008-01-24 16:13:08 -050096};
97
98struct extent_io_tree {
99 struct rb_root state;
Miao Xie19fe0a82010-10-26 20:57:29 -0400100 struct radix_tree_root buffer;
Chris Masond1310b22008-01-24 16:13:08 -0500101 struct address_space *mapping;
102 u64 dirty_bytes;
Josef Bacik0b32f4b2012-03-13 09:38:00 -0400103 int track_uptodate;
Chris Mason70dec802008-01-29 09:59:12 -0500104 spinlock_t lock;
Chris Mason6af118ce2008-07-22 11:18:07 -0400105 spinlock_t buffer_lock;
Chris Masond1310b22008-01-24 16:13:08 -0500106 struct extent_io_ops *ops;
Chris Masond1310b22008-01-24 16:13:08 -0500107};
108
109struct extent_state {
110 u64 start;
111 u64 end; /* inclusive */
Chris Masond1310b22008-01-24 16:13:08 -0500112 struct rb_node rb_node;
Josef Bacik9ed74f22009-09-11 16:12:44 -0400113
114 /* ADD NEW ELEMENTS AFTER THIS */
Chris Mason70dec802008-01-29 09:59:12 -0500115 struct extent_io_tree *tree;
Chris Masond1310b22008-01-24 16:13:08 -0500116 wait_queue_head_t wq;
117 atomic_t refs;
118 unsigned long state;
119
120 /* for use by the FS */
121 u64 private;
122
Chris Mason2d2ae542008-03-26 16:24:23 -0400123 struct list_head leak_list;
Chris Masond1310b22008-01-24 16:13:08 -0500124};
125
Chris Mason727011e2010-08-06 13:21:20 -0400126#define INLINE_EXTENT_BUFFER_PAGES 16
127#define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
Chris Masond1310b22008-01-24 16:13:08 -0500128struct extent_buffer {
129 u64 start;
130 unsigned long len;
Chris Masond1310b22008-01-24 16:13:08 -0500131 unsigned long map_start;
132 unsigned long map_len;
Chris Masonb4ce94d2009-02-04 09:25:08 -0500133 unsigned long bflags;
Josef Bacik4f2de97a2012-03-07 16:20:05 -0500134 struct extent_io_tree *tree;
Josef Bacik3083ee22012-03-09 16:01:49 -0500135 spinlock_t refs_lock;
Chris Mason727011e2010-08-06 13:21:20 -0400136 atomic_t refs;
Josef Bacik0b32f4b2012-03-13 09:38:00 -0400137 atomic_t io_pages;
Josef Bacikea466792012-03-26 21:57:36 -0400138 int failed_mirror;
Chris Mason2d2ae542008-03-26 16:24:23 -0400139 struct list_head leak_list;
Miao Xie19fe0a82010-10-26 20:57:29 -0400140 struct rcu_head rcu_head;
Arne Jansen5b25f702011-09-13 10:55:48 +0200141 pid_t lock_owner;
Chris Masonb4ce94d2009-02-04 09:25:08 -0500142
Chris Masonbd681512011-07-16 15:23:14 -0400143 /* count of read lock holders on the extent buffer */
144 atomic_t write_locks;
145 atomic_t read_locks;
146 atomic_t blocking_writers;
147 atomic_t blocking_readers;
148 atomic_t spinning_readers;
149 atomic_t spinning_writers;
Arne Jansen5b25f702011-09-13 10:55:48 +0200150 int lock_nested;
Chris Masonb4ce94d2009-02-04 09:25:08 -0500151
Chris Masonbd681512011-07-16 15:23:14 -0400152 /* protects write locks */
153 rwlock_t lock;
154
155 /* readers use lock_wq while they wait for the write
156 * lock holders to unlock
Chris Masonb4ce94d2009-02-04 09:25:08 -0500157 */
Chris Masonbd681512011-07-16 15:23:14 -0400158 wait_queue_head_t write_lock_wq;
159
160 /* writers use read_lock_wq while they wait for readers
161 * to unlock
162 */
163 wait_queue_head_t read_lock_wq;
Chris Mason727011e2010-08-06 13:21:20 -0400164 wait_queue_head_t lock_wq;
165 struct page *inline_pages[INLINE_EXTENT_BUFFER_PAGES];
166 struct page **pages;
Chris Masond1310b22008-01-24 16:13:08 -0500167};
168
Li Zefan261507a02010-12-17 14:21:50 +0800169static inline void extent_set_compress_type(unsigned long *bio_flags,
170 int compress_type)
171{
172 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
173}
174
175static inline int extent_compress_type(unsigned long bio_flags)
176{
177 return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
178}
179
Chris Masond1310b22008-01-24 16:13:08 -0500180struct extent_map_tree;
181
182typedef struct extent_map *(get_extent_t)(struct inode *inode,
183 struct page *page,
David Sterba306e16c2011-04-19 14:29:38 +0200184 size_t pg_offset,
Chris Masond1310b22008-01-24 16:13:08 -0500185 u64 start, u64 len,
186 int create);
187
188void extent_io_tree_init(struct extent_io_tree *tree,
David Sterbaf993c882011-04-20 23:35:57 +0200189 struct address_space *mapping);
Chris Masond1310b22008-01-24 16:13:08 -0500190int try_release_extent_mapping(struct extent_map_tree *map,
Chris Mason70dec802008-01-29 09:59:12 -0500191 struct extent_io_tree *tree, struct page *page,
192 gfp_t mask);
Josef Bacik3083ee22012-03-09 16:01:49 -0500193int try_release_extent_buffer(struct page *page, gfp_t mask);
Chris Mason7b13b7b2008-04-18 10:29:50 -0400194int try_release_extent_state(struct extent_map_tree *map,
195 struct extent_io_tree *tree, struct page *page,
196 gfp_t mask);
Jeff Mahoneyd0082372012-03-01 14:57:19 +0100197int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
Chris Mason1edbb732009-09-02 13:24:36 -0400198int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
Jeff Mahoneyd0082372012-03-01 14:57:19 +0100199 int bits, struct extent_state **cached);
200int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
Josef Bacik2ac55d42010-02-03 19:33:23 +0000201int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
202 struct extent_state **cached, gfp_t mask);
Jeff Mahoneyd0082372012-03-01 14:57:19 +0100203int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
Chris Masond1310b22008-01-24 16:13:08 -0500204int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
Jan Schmidt8ddc7d92011-06-13 20:02:58 +0200205 get_extent_t *get_extent, int mirror_num);
Chris Masond1310b22008-01-24 16:13:08 -0500206int __init extent_io_init(void);
207void extent_io_exit(void);
208
209u64 count_range_bits(struct extent_io_tree *tree,
210 u64 *start, u64 search_end,
Chris Masonec29ed52011-02-23 16:23:20 -0500211 u64 max_bytes, unsigned long bits, int contig);
Chris Masond1310b22008-01-24 16:13:08 -0500212
Chris Mason4845e442010-05-25 20:56:50 -0400213void free_extent_state(struct extent_state *state);
Chris Masond1310b22008-01-24 16:13:08 -0500214int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
Chris Mason9655d292009-09-02 15:22:30 -0400215 int bits, int filled, struct extent_state *cached_state);
Chris Masond1310b22008-01-24 16:13:08 -0500216int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
217 int bits, gfp_t mask);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400218int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
Chris Mason2c64c532009-09-02 15:04:12 -0400219 int bits, int wake, int delete, struct extent_state **cached,
220 gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500221int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
222 int bits, gfp_t mask);
Chris Mason4845e442010-05-25 20:56:50 -0400223int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
Jeff Mahoney3fbe5c02012-03-01 14:57:19 +0100224 int bits, u64 *failed_start,
Chris Mason4845e442010-05-25 20:56:50 -0400225 struct extent_state **cached_state, gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500226int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
Arne Jansen507903b2011-04-06 10:02:20 +0000227 struct extent_state **cached_state, gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500228int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
229 gfp_t mask);
230int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
231 gfp_t mask);
232int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
233 gfp_t mask);
Josef Bacik462d6fa2011-09-26 13:56:12 -0400234int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
235 int bits, int clear_bits, gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500236int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
Josef Bacik2ac55d42010-02-03 19:33:23 +0000237 struct extent_state **cached_state, gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500238int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
239 u64 *start_ret, u64 *end_ret, int bits);
Chris Masond7fc6402008-02-18 12:12:38 -0500240struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
241 u64 start, int bits);
Chris Masond1310b22008-01-24 16:13:08 -0500242int extent_invalidatepage(struct extent_io_tree *tree,
243 struct page *page, unsigned long offset);
244int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
245 get_extent_t *get_extent,
246 struct writeback_control *wbc);
Chris Mason771ed682008-11-06 22:02:51 -0500247int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
248 u64 start, u64 end, get_extent_t *get_extent,
249 int mode);
Chris Masond1310b22008-01-24 16:13:08 -0500250int extent_writepages(struct extent_io_tree *tree,
251 struct address_space *mapping,
252 get_extent_t *get_extent,
253 struct writeback_control *wbc);
Josef Bacik0b32f4b2012-03-13 09:38:00 -0400254int btree_write_cache_pages(struct address_space *mapping,
255 struct writeback_control *wbc);
Chris Masond1310b22008-01-24 16:13:08 -0500256int extent_readpages(struct extent_io_tree *tree,
257 struct address_space *mapping,
258 struct list_head *pages, unsigned nr_pages,
259 get_extent_t get_extent);
Yehuda Sadeh1506fcc2009-01-21 14:39:14 -0500260int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
261 __u64 start, __u64 len, get_extent_t *get_extent);
Chris Masond1310b22008-01-24 16:13:08 -0500262int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
263int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
264void set_page_extent_mapped(struct page *page);
265
266struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
Chris Mason727011e2010-08-06 13:21:20 -0400267 u64 start, unsigned long len);
Chris Masond1310b22008-01-24 16:13:08 -0500268struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
David Sterbaf09d1f62011-04-21 01:08:01 +0200269 u64 start, unsigned long len);
Chris Masond1310b22008-01-24 16:13:08 -0500270void free_extent_buffer(struct extent_buffer *eb);
Josef Bacik3083ee22012-03-09 16:01:49 -0500271void free_extent_buffer_stale(struct extent_buffer *eb);
Arne Jansenbb82ab82011-06-10 14:06:53 +0200272#define WAIT_NONE 0
273#define WAIT_COMPLETE 1
274#define WAIT_PAGE_LOCK 2
Chris Masond1310b22008-01-24 16:13:08 -0500275int read_extent_buffer_pages(struct extent_io_tree *tree,
Chris Masona86c12c2008-02-07 10:50:54 -0500276 struct extent_buffer *eb, u64 start, int wait,
Chris Masonf1885912008-04-09 16:28:12 -0400277 get_extent_t *get_extent, int mirror_num);
Jan Schmidt4a54c8c2011-07-22 15:41:52 +0200278unsigned long num_extent_pages(u64 start, u64 len);
279struct page *extent_buffer_page(struct extent_buffer *eb, unsigned long i);
Chris Masond1310b22008-01-24 16:13:08 -0500280
281static inline void extent_buffer_get(struct extent_buffer *eb)
282{
283 atomic_inc(&eb->refs);
284}
285
286int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
287 unsigned long start,
288 unsigned long len);
289void read_extent_buffer(struct extent_buffer *eb, void *dst,
290 unsigned long start,
291 unsigned long len);
292void write_extent_buffer(struct extent_buffer *eb, const void *src,
293 unsigned long start, unsigned long len);
294void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
295 unsigned long dst_offset, unsigned long src_offset,
296 unsigned long len);
297void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
298 unsigned long src_offset, unsigned long len);
299void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
300 unsigned long src_offset, unsigned long len);
301void memset_extent_buffer(struct extent_buffer *eb, char c,
302 unsigned long start, unsigned long len);
Jeff Mahoney143bede2012-03-01 14:56:26 +0100303void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
Chris Mason1d4284b2012-03-28 20:31:37 -0400304void clear_extent_buffer_dirty(struct extent_buffer *eb);
Josef Bacik0b32f4b2012-03-13 09:38:00 -0400305int set_extent_buffer_dirty(struct extent_buffer *eb);
306int set_extent_buffer_uptodate(struct extent_buffer *eb);
307int clear_extent_buffer_uptodate(struct extent_buffer *eb);
308int extent_buffer_uptodate(struct extent_buffer *eb);
Chris Masond1310b22008-01-24 16:13:08 -0500309int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
Chris Masona6591712011-07-19 12:04:14 -0400310 unsigned long min_len, char **map,
Chris Masond1310b22008-01-24 16:13:08 -0500311 unsigned long *map_start,
Chris Masona6591712011-07-19 12:04:14 -0400312 unsigned long *map_len);
Chris Masonce9adaa2008-04-09 16:28:12 -0400313int extent_range_uptodate(struct extent_io_tree *tree,
314 u64 start, u64 end);
Chris Masonc8b97812008-10-29 14:49:59 -0400315int extent_clear_unlock_delalloc(struct inode *inode,
316 struct extent_io_tree *tree,
317 u64 start, u64 end, struct page *locked_page,
Chris Masona791e352009-10-08 11:27:10 -0400318 unsigned long op);
Miao Xie88f794e2010-11-22 03:02:55 +0000319struct bio *
320btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
321 gfp_t gfp_flags);
Jan Schmidt4a54c8c2011-07-22 15:41:52 +0200322
323struct btrfs_mapping_tree;
324
325int repair_io_failure(struct btrfs_mapping_tree *map_tree, u64 start,
326 u64 length, u64 logical, struct page *page,
327 int mirror_num);
Jeff Mahoney87826df2012-02-15 16:23:57 +0100328int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
Josef Bacikea466792012-03-26 21:57:36 -0400329int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
330 int mirror_num);
Chris Masond1310b22008-01-24 16:13:08 -0500331#endif