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1#ifndef __EXTENTIO__
2#define __EXTENTIO__
3
4#include <linux/rbtree.h>
5#include "ulist.h"
6
7/* bits for the extent state */
8#define EXTENT_DIRTY (1U << 0)
9#define EXTENT_WRITEBACK (1U << 1)
10#define EXTENT_UPTODATE (1U << 2)
11#define EXTENT_LOCKED (1U << 3)
12#define EXTENT_NEW (1U << 4)
13#define EXTENT_DELALLOC (1U << 5)
14#define EXTENT_DEFRAG (1U << 6)
15#define EXTENT_BOUNDARY (1U << 9)
16#define EXTENT_NODATASUM (1U << 10)
17#define EXTENT_DO_ACCOUNTING (1U << 11)
18#define EXTENT_FIRST_DELALLOC (1U << 12)
19#define EXTENT_NEED_WAIT (1U << 13)
20#define EXTENT_DAMAGED (1U << 14)
21#define EXTENT_NORESERVE (1U << 15)
22#define EXTENT_QGROUP_RESERVED (1U << 16)
23#define EXTENT_CLEAR_DATA_RESV (1U << 17)
24#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
25#define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
26
27/*
28 * flags for bio submission. The high bits indicate the compression
29 * type for this bio
30 */
31#define EXTENT_BIO_COMPRESSED 1
32#define EXTENT_BIO_TREE_LOG 2
33#define EXTENT_BIO_FLAG_SHIFT 16
34
35/* these are bit numbers for test/set bit */
36#define EXTENT_BUFFER_UPTODATE 0
37#define EXTENT_BUFFER_DIRTY 2
38#define EXTENT_BUFFER_CORRUPT 3
39#define EXTENT_BUFFER_READAHEAD 4 /* this got triggered by readahead */
40#define EXTENT_BUFFER_TREE_REF 5
41#define EXTENT_BUFFER_STALE 6
42#define EXTENT_BUFFER_WRITEBACK 7
43#define EXTENT_BUFFER_READ_ERR 8 /* read IO error */
44#define EXTENT_BUFFER_DUMMY 9
45#define EXTENT_BUFFER_IN_TREE 10
46#define EXTENT_BUFFER_WRITE_ERR 11 /* write IO error */
47
48/* these are flags for extent_clear_unlock_delalloc */
49#define PAGE_UNLOCK (1 << 0)
50#define PAGE_CLEAR_DIRTY (1 << 1)
51#define PAGE_SET_WRITEBACK (1 << 2)
52#define PAGE_END_WRITEBACK (1 << 3)
53#define PAGE_SET_PRIVATE2 (1 << 4)
54#define PAGE_SET_ERROR (1 << 5)
55
56/*
57 * page->private values. Every page that is controlled by the extent
58 * map has page->private set to one.
59 */
60#define EXTENT_PAGE_PRIVATE 1
61
62/*
63 * The extent buffer bitmap operations are done with byte granularity instead of
64 * word granularity for two reasons:
65 * 1. The bitmaps must be little-endian on disk.
66 * 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
67 * single word in a bitmap may straddle two pages in the extent buffer.
68 */
69#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
70#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
71#define BITMAP_FIRST_BYTE_MASK(start) \
72 ((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
73#define BITMAP_LAST_BYTE_MASK(nbits) \
74 (BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
75
76static inline int le_test_bit(int nr, const u8 *addr)
77{
78 return 1U & (addr[BIT_BYTE(nr)] >> (nr & (BITS_PER_BYTE-1)));
79}
80
81extern void le_bitmap_set(u8 *map, unsigned int start, int len);
82extern void le_bitmap_clear(u8 *map, unsigned int start, int len);
83
84struct extent_state;
85struct btrfs_root;
86struct btrfs_io_bio;
87struct io_failure_record;
88
89typedef int (extent_submit_bio_hook_t)(struct inode *inode, struct bio *bio,
90 int mirror_num, unsigned long bio_flags,
91 u64 bio_offset);
92struct extent_io_ops {
93 int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
94 u64 start, u64 end, int *page_started,
95 unsigned long *nr_written);
96 int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
97 extent_submit_bio_hook_t *submit_bio_hook;
98 int (*merge_bio_hook)(struct page *page, unsigned long offset,
99 size_t size, struct bio *bio,
100 unsigned long bio_flags);
101 int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
102 int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset,
103 struct page *page, u64 start, u64 end,
104 int mirror);
105 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
106 struct extent_state *state, int uptodate);
107 void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
108 unsigned *bits);
109 void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
110 unsigned *bits);
111 void (*merge_extent_hook)(struct inode *inode,
112 struct extent_state *new,
113 struct extent_state *other);
114 void (*split_extent_hook)(struct inode *inode,
115 struct extent_state *orig, u64 split);
116};
117
118struct extent_io_tree {
119 struct rb_root state;
120 struct address_space *mapping;
121 u64 dirty_bytes;
122 int track_uptodate;
123 spinlock_t lock;
124 const struct extent_io_ops *ops;
125};
126
127struct extent_state {
128 u64 start;
129 u64 end; /* inclusive */
130 struct rb_node rb_node;
131
132 /* ADD NEW ELEMENTS AFTER THIS */
133 wait_queue_head_t wq;
134 atomic_t refs;
135 unsigned state;
136
137 struct io_failure_record *failrec;
138
139#ifdef CONFIG_BTRFS_DEBUG
140 struct list_head leak_list;
141#endif
142};
143
144#define INLINE_EXTENT_BUFFER_PAGES 16
145#define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_SIZE)
146struct extent_buffer {
147 u64 start;
148 unsigned long len;
149 unsigned long bflags;
150 struct btrfs_fs_info *fs_info;
151 spinlock_t refs_lock;
152 atomic_t refs;
153 atomic_t io_pages;
154 int read_mirror;
155 struct rcu_head rcu_head;
156 pid_t lock_owner;
157
158 /* count of read lock holders on the extent buffer */
159 atomic_t write_locks;
160 atomic_t read_locks;
161 atomic_t blocking_writers;
162 atomic_t blocking_readers;
163 atomic_t spinning_readers;
164 atomic_t spinning_writers;
165 short lock_nested;
166 /* >= 0 if eb belongs to a log tree, -1 otherwise */
167 short log_index;
168
169 /* protects write locks */
170 rwlock_t lock;
171
172 /* readers use lock_wq while they wait for the write
173 * lock holders to unlock
174 */
175 wait_queue_head_t write_lock_wq;
176
177 /* writers use read_lock_wq while they wait for readers
178 * to unlock
179 */
180 wait_queue_head_t read_lock_wq;
181 struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
182#ifdef CONFIG_BTRFS_DEBUG
183 struct list_head leak_list;
184#endif
185};
186
187/*
188 * Structure to record how many bytes and which ranges are set/cleared
189 */
190struct extent_changeset {
191 /* How many bytes are set/cleared in this operation */
192 u64 bytes_changed;
193
194 /* Changed ranges */
195 struct ulist *range_changed;
196};
197
198static inline void extent_set_compress_type(unsigned long *bio_flags,
199 int compress_type)
200{
201 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
202}
203
204static inline int extent_compress_type(unsigned long bio_flags)
205{
206 return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
207}
208
209struct extent_map_tree;
210
211typedef struct extent_map *(get_extent_t)(struct inode *inode,
212 struct page *page,
213 size_t pg_offset,
214 u64 start, u64 len,
215 int create);
216
217void extent_io_tree_init(struct extent_io_tree *tree,
218 struct address_space *mapping);
219int try_release_extent_mapping(struct extent_map_tree *map,
220 struct extent_io_tree *tree, struct page *page,
221 gfp_t mask);
222int try_release_extent_buffer(struct page *page);
223int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
224 struct extent_state **cached);
225
226static inline int lock_extent(struct extent_io_tree *tree, u64 start, u64 end)
227{
228 return lock_extent_bits(tree, start, end, NULL);
229}
230
231int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
232int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
233 get_extent_t *get_extent, int mirror_num);
234int __init extent_io_init(void);
235void extent_io_exit(void);
236
237u64 count_range_bits(struct extent_io_tree *tree,
238 u64 *start, u64 search_end,
239 u64 max_bytes, unsigned bits, int contig);
240
241void free_extent_state(struct extent_state *state);
242int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
243 unsigned bits, int filled,
244 struct extent_state *cached_state);
245int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
246 unsigned bits, struct extent_changeset *changeset);
247int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
248 unsigned bits, int wake, int delete,
249 struct extent_state **cached, gfp_t mask);
250
251static inline int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end)
252{
253 return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL,
254 GFP_NOFS);
255}
256
257static inline int unlock_extent_cached(struct extent_io_tree *tree, u64 start,
258 u64 end, struct extent_state **cached, gfp_t mask)
259{
260 return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached,
261 mask);
262}
263
264static inline int clear_extent_bits(struct extent_io_tree *tree, u64 start,
265 u64 end, unsigned bits)
266{
267 int wake = 0;
268
269 if (bits & EXTENT_LOCKED)
270 wake = 1;
271
272 return clear_extent_bit(tree, start, end, bits, wake, 0, NULL,
273 GFP_NOFS);
274}
275
276int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
277 unsigned bits, struct extent_changeset *changeset);
278int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
279 unsigned bits, u64 *failed_start,
280 struct extent_state **cached_state, gfp_t mask);
281
282static inline int set_extent_bits(struct extent_io_tree *tree, u64 start,
283 u64 end, unsigned bits)
284{
285 return set_extent_bit(tree, start, end, bits, NULL, NULL, GFP_NOFS);
286}
287
288static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
289 u64 end, struct extent_state **cached_state, gfp_t mask)
290{
291 return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0,
292 cached_state, mask);
293}
294
295static inline int set_extent_dirty(struct extent_io_tree *tree, u64 start,
296 u64 end, gfp_t mask)
297{
298 return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL,
299 NULL, mask);
300}
301
302static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start,
303 u64 end)
304{
305 return clear_extent_bit(tree, start, end,
306 EXTENT_DIRTY | EXTENT_DELALLOC |
307 EXTENT_DO_ACCOUNTING, 0, 0, NULL, GFP_NOFS);
308}
309
310int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
311 unsigned bits, unsigned clear_bits,
312 struct extent_state **cached_state);
313
314static inline int set_extent_delalloc(struct extent_io_tree *tree, u64 start,
315 u64 end, struct extent_state **cached_state)
316{
317 return set_extent_bit(tree, start, end,
318 EXTENT_DELALLOC | EXTENT_UPTODATE,
319 NULL, cached_state, GFP_NOFS);
320}
321
322static inline int set_extent_defrag(struct extent_io_tree *tree, u64 start,
323 u64 end, struct extent_state **cached_state)
324{
325 return set_extent_bit(tree, start, end,
326 EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG,
327 NULL, cached_state, GFP_NOFS);
328}
329
330static inline int set_extent_new(struct extent_io_tree *tree, u64 start,
331 u64 end)
332{
333 return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, NULL,
334 GFP_NOFS);
335}
336
337static inline int set_extent_uptodate(struct extent_io_tree *tree, u64 start,
338 u64 end, struct extent_state **cached_state, gfp_t mask)
339{
340 return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL,
341 cached_state, mask);
342}
343
344int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
345 u64 *start_ret, u64 *end_ret, unsigned bits,
346 struct extent_state **cached_state);
347int extent_invalidatepage(struct extent_io_tree *tree,
348 struct page *page, unsigned long offset);
349int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
350 get_extent_t *get_extent,
351 struct writeback_control *wbc);
352int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
353 u64 start, u64 end, get_extent_t *get_extent,
354 int mode);
355int extent_writepages(struct extent_io_tree *tree,
356 struct address_space *mapping,
357 get_extent_t *get_extent,
358 struct writeback_control *wbc);
359int btree_write_cache_pages(struct address_space *mapping,
360 struct writeback_control *wbc);
361int extent_readpages(struct extent_io_tree *tree,
362 struct address_space *mapping,
363 struct list_head *pages, unsigned nr_pages,
364 get_extent_t get_extent);
365int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
366 __u64 start, __u64 len, get_extent_t *get_extent);
367void set_page_extent_mapped(struct page *page);
368
369struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
370 u64 start);
371struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
372 u64 start, unsigned long len);
373struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
374 u64 start);
375struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
376struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
377 u64 start);
378void free_extent_buffer(struct extent_buffer *eb);
379void free_extent_buffer_stale(struct extent_buffer *eb);
380#define WAIT_NONE 0
381#define WAIT_COMPLETE 1
382#define WAIT_PAGE_LOCK 2
383int read_extent_buffer_pages(struct extent_io_tree *tree,
384 struct extent_buffer *eb, int wait,
385 get_extent_t *get_extent, int mirror_num);
386void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
387
388static inline unsigned long num_extent_pages(u64 start, u64 len)
389{
390 return ((start + len + PAGE_SIZE - 1) >> PAGE_SHIFT) -
391 (start >> PAGE_SHIFT);
392}
393
394static inline void extent_buffer_get(struct extent_buffer *eb)
395{
396 atomic_inc(&eb->refs);
397}
398
399int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
400 unsigned long start,
401 unsigned long len);
402void read_extent_buffer(struct extent_buffer *eb, void *dst,
403 unsigned long start,
404 unsigned long len);
405int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dst,
406 unsigned long start,
407 unsigned long len);
408void write_extent_buffer_fsid(struct extent_buffer *eb, const void *src);
409void write_extent_buffer_chunk_tree_uuid(struct extent_buffer *eb,
410 const void *src);
411void write_extent_buffer(struct extent_buffer *eb, const void *src,
412 unsigned long start, unsigned long len);
413void copy_extent_buffer_full(struct extent_buffer *dst,
414 struct extent_buffer *src);
415void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
416 unsigned long dst_offset, unsigned long src_offset,
417 unsigned long len);
418void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
419 unsigned long src_offset, unsigned long len);
420void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
421 unsigned long src_offset, unsigned long len);
422void memzero_extent_buffer(struct extent_buffer *eb, unsigned long start,
423 unsigned long len);
424int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
425 unsigned long pos);
426void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
427 unsigned long pos, unsigned long len);
428void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
429 unsigned long pos, unsigned long len);
430void clear_extent_buffer_dirty(struct extent_buffer *eb);
431int set_extent_buffer_dirty(struct extent_buffer *eb);
432void set_extent_buffer_uptodate(struct extent_buffer *eb);
433void clear_extent_buffer_uptodate(struct extent_buffer *eb);
434int extent_buffer_uptodate(struct extent_buffer *eb);
435int extent_buffer_under_io(struct extent_buffer *eb);
436int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
437 unsigned long min_len, char **map,
438 unsigned long *map_start,
439 unsigned long *map_len);
440void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
441void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
442void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
443 u64 delalloc_end, struct page *locked_page,
444 unsigned bits_to_clear,
445 unsigned long page_ops);
446struct bio *
447btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
448 gfp_t gfp_flags);
449struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
450struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask);
451
452struct btrfs_fs_info;
453
454int repair_io_failure(struct inode *inode, u64 start, u64 length, u64 logical,
455 struct page *page, unsigned int pg_offset,
456 int mirror_num);
457int clean_io_failure(struct inode *inode, u64 start, struct page *page,
458 unsigned int pg_offset);
459void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
460int repair_eb_io_failure(struct btrfs_fs_info *fs_info,
461 struct extent_buffer *eb, int mirror_num);
462
463/*
464 * When IO fails, either with EIO or csum verification fails, we
465 * try other mirrors that might have a good copy of the data. This
466 * io_failure_record is used to record state as we go through all the
467 * mirrors. If another mirror has good data, the page is set up to date
468 * and things continue. If a good mirror can't be found, the original
469 * bio end_io callback is called to indicate things have failed.
470 */
471struct io_failure_record {
472 struct page *page;
473 u64 start;
474 u64 len;
475 u64 logical;
476 unsigned long bio_flags;
477 int this_mirror;
478 int failed_mirror;
479 int in_validation;
480};
481
482void btrfs_free_io_failure_record(struct inode *inode, u64 start, u64 end);
483int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end,
484 struct io_failure_record **failrec_ret);
485int btrfs_check_repairable(struct inode *inode, struct bio *failed_bio,
486 struct io_failure_record *failrec, int fail_mirror);
487struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio,
488 struct io_failure_record *failrec,
489 struct page *page, int pg_offset, int icsum,
490 bio_end_io_t *endio_func, void *data);
491int free_io_failure(struct inode *inode, struct io_failure_record *rec);
492#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
493noinline u64 find_lock_delalloc_range(struct inode *inode,
494 struct extent_io_tree *tree,
495 struct page *locked_page, u64 *start,
496 u64 *end, u64 max_bytes);
497#endif
498struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
499 u64 start);
500#endif
1#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)
16#define EXTENT_BOUNDARY (1 << 9)
17#define EXTENT_NODATASUM (1 << 10)
18#define EXTENT_DO_ACCOUNTING (1 << 11)
19#define EXTENT_FIRST_DELALLOC (1 << 12)
20#define EXTENT_NEED_WAIT (1 << 13)
21#define EXTENT_DAMAGED (1 << 14)
22#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
23#define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
24
25/*
26 * flags for bio submission. The high bits indicate the compression
27 * type for this bio
28 */
29#define EXTENT_BIO_COMPRESSED 1
30#define EXTENT_BIO_FLAG_SHIFT 16
31
32/* these are bit numbers for test/set bit */
33#define EXTENT_BUFFER_UPTODATE 0
34#define EXTENT_BUFFER_BLOCKING 1
35#define EXTENT_BUFFER_DIRTY 2
36#define EXTENT_BUFFER_CORRUPT 3
37#define EXTENT_BUFFER_READAHEAD 4 /* this got triggered by readahead */
38#define EXTENT_BUFFER_TREE_REF 5
39#define EXTENT_BUFFER_STALE 6
40#define EXTENT_BUFFER_WRITEBACK 7
41#define EXTENT_BUFFER_IOERR 8
42#define EXTENT_BUFFER_DUMMY 9
43
44/* these are flags for extent_clear_unlock_delalloc */
45#define EXTENT_CLEAR_UNLOCK_PAGE 0x1
46#define EXTENT_CLEAR_UNLOCK 0x2
47#define EXTENT_CLEAR_DELALLOC 0x4
48#define EXTENT_CLEAR_DIRTY 0x8
49#define EXTENT_SET_WRITEBACK 0x10
50#define EXTENT_END_WRITEBACK 0x20
51#define EXTENT_SET_PRIVATE2 0x40
52#define EXTENT_CLEAR_ACCOUNTING 0x80
53
54/*
55 * page->private values. Every page that is controlled by the extent
56 * map has page->private set to one.
57 */
58#define EXTENT_PAGE_PRIVATE 1
59#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
60
61struct extent_state;
62struct btrfs_root;
63
64typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
65 struct bio *bio, int mirror_num,
66 unsigned long bio_flags, u64 bio_offset);
67struct extent_io_ops {
68 int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
69 u64 start, u64 end, int *page_started,
70 unsigned long *nr_written);
71 int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
72 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
73 extent_submit_bio_hook_t *submit_bio_hook;
74 int (*merge_bio_hook)(struct page *page, unsigned long offset,
75 size_t size, struct bio *bio,
76 unsigned long bio_flags);
77 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
78 int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
79 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
80 struct extent_state *state, int mirror);
81 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
82 struct extent_state *state, int uptodate);
83 void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
84 int *bits);
85 void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
86 int *bits);
87 void (*merge_extent_hook)(struct inode *inode,
88 struct extent_state *new,
89 struct extent_state *other);
90 void (*split_extent_hook)(struct inode *inode,
91 struct extent_state *orig, u64 split);
92 int (*write_cache_pages_lock_hook)(struct page *page, void *data,
93 void (*flush_fn)(void *));
94};
95
96struct extent_io_tree {
97 struct rb_root state;
98 struct radix_tree_root buffer;
99 struct address_space *mapping;
100 u64 dirty_bytes;
101 int track_uptodate;
102 spinlock_t lock;
103 spinlock_t buffer_lock;
104 struct extent_io_ops *ops;
105};
106
107struct extent_state {
108 u64 start;
109 u64 end; /* inclusive */
110 struct rb_node rb_node;
111
112 /* ADD NEW ELEMENTS AFTER THIS */
113 struct extent_io_tree *tree;
114 wait_queue_head_t wq;
115 atomic_t refs;
116 unsigned long state;
117
118 /* for use by the FS */
119 u64 private;
120
121 struct list_head leak_list;
122};
123
124#define INLINE_EXTENT_BUFFER_PAGES 16
125#define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
126struct extent_buffer {
127 u64 start;
128 unsigned long len;
129 unsigned long map_start;
130 unsigned long map_len;
131 unsigned long bflags;
132 struct extent_io_tree *tree;
133 spinlock_t refs_lock;
134 atomic_t refs;
135 atomic_t io_pages;
136 int read_mirror;
137 struct list_head leak_list;
138 struct rcu_head rcu_head;
139 pid_t lock_owner;
140
141 /* count of read lock holders on the extent buffer */
142 atomic_t write_locks;
143 atomic_t read_locks;
144 atomic_t blocking_writers;
145 atomic_t blocking_readers;
146 atomic_t spinning_readers;
147 atomic_t spinning_writers;
148 int lock_nested;
149
150 /* protects write locks */
151 rwlock_t lock;
152
153 /* readers use lock_wq while they wait for the write
154 * lock holders to unlock
155 */
156 wait_queue_head_t write_lock_wq;
157
158 /* writers use read_lock_wq while they wait for readers
159 * to unlock
160 */
161 wait_queue_head_t read_lock_wq;
162 wait_queue_head_t lock_wq;
163 struct page *inline_pages[INLINE_EXTENT_BUFFER_PAGES];
164 struct page **pages;
165};
166
167static inline void extent_set_compress_type(unsigned long *bio_flags,
168 int compress_type)
169{
170 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
171}
172
173static inline int extent_compress_type(unsigned long bio_flags)
174{
175 return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
176}
177
178struct extent_map_tree;
179
180typedef struct extent_map *(get_extent_t)(struct inode *inode,
181 struct page *page,
182 size_t pg_offset,
183 u64 start, u64 len,
184 int create);
185
186void extent_io_tree_init(struct extent_io_tree *tree,
187 struct address_space *mapping);
188int try_release_extent_mapping(struct extent_map_tree *map,
189 struct extent_io_tree *tree, struct page *page,
190 gfp_t mask);
191int try_release_extent_buffer(struct page *page, gfp_t mask);
192int try_release_extent_state(struct extent_map_tree *map,
193 struct extent_io_tree *tree, struct page *page,
194 gfp_t mask);
195int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
196int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
197 int bits, struct extent_state **cached);
198int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
199int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
200 struct extent_state **cached, gfp_t mask);
201int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
202int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
203 get_extent_t *get_extent, int mirror_num);
204int __init extent_io_init(void);
205void extent_io_exit(void);
206
207u64 count_range_bits(struct extent_io_tree *tree,
208 u64 *start, u64 search_end,
209 u64 max_bytes, unsigned long bits, int contig);
210
211void free_extent_state(struct extent_state *state);
212int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
213 int bits, int filled, struct extent_state *cached_state);
214int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
215 int bits, gfp_t mask);
216int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
217 int bits, int wake, int delete, struct extent_state **cached,
218 gfp_t mask);
219int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
220 int bits, gfp_t mask);
221int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
222 int bits, u64 *failed_start,
223 struct extent_state **cached_state, gfp_t mask);
224int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
225 struct extent_state **cached_state, gfp_t mask);
226int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
227 struct extent_state **cached_state, gfp_t mask);
228int 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);
234int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
235 int bits, int clear_bits, gfp_t mask);
236int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
237 struct extent_state **cached_state, gfp_t mask);
238int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
239 u64 *start_ret, u64 *end_ret, int bits);
240struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
241 u64 start, int bits);
242int 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);
247int 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);
250int extent_writepages(struct extent_io_tree *tree,
251 struct address_space *mapping,
252 get_extent_t *get_extent,
253 struct writeback_control *wbc);
254int btree_write_cache_pages(struct address_space *mapping,
255 struct writeback_control *wbc);
256int 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);
260int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
261 __u64 start, __u64 len, get_extent_t *get_extent);
262int 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,
267 u64 start, unsigned long len);
268struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len);
269struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
270struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
271 u64 start, unsigned long len);
272void free_extent_buffer(struct extent_buffer *eb);
273void free_extent_buffer_stale(struct extent_buffer *eb);
274#define WAIT_NONE 0
275#define WAIT_COMPLETE 1
276#define WAIT_PAGE_LOCK 2
277int read_extent_buffer_pages(struct extent_io_tree *tree,
278 struct extent_buffer *eb, u64 start, int wait,
279 get_extent_t *get_extent, int mirror_num);
280unsigned long num_extent_pages(u64 start, u64 len);
281struct page *extent_buffer_page(struct extent_buffer *eb, unsigned long i);
282
283static inline void extent_buffer_get(struct extent_buffer *eb)
284{
285 atomic_inc(&eb->refs);
286}
287
288int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
289 unsigned long start,
290 unsigned long len);
291void read_extent_buffer(struct extent_buffer *eb, void *dst,
292 unsigned long start,
293 unsigned long len);
294void write_extent_buffer(struct extent_buffer *eb, const void *src,
295 unsigned long start, unsigned long len);
296void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
297 unsigned long dst_offset, unsigned long src_offset,
298 unsigned long len);
299void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
300 unsigned long src_offset, unsigned long len);
301void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
302 unsigned long src_offset, unsigned long len);
303void memset_extent_buffer(struct extent_buffer *eb, char c,
304 unsigned long start, unsigned long len);
305void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
306void clear_extent_buffer_dirty(struct extent_buffer *eb);
307int set_extent_buffer_dirty(struct extent_buffer *eb);
308int set_extent_buffer_uptodate(struct extent_buffer *eb);
309int clear_extent_buffer_uptodate(struct extent_buffer *eb);
310int extent_buffer_uptodate(struct extent_buffer *eb);
311int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
312 unsigned long min_len, char **map,
313 unsigned long *map_start,
314 unsigned long *map_len);
315int extent_range_uptodate(struct extent_io_tree *tree,
316 u64 start, u64 end);
317int extent_clear_unlock_delalloc(struct inode *inode,
318 struct extent_io_tree *tree,
319 u64 start, u64 end, struct page *locked_page,
320 unsigned long op);
321struct bio *
322btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
323 gfp_t gfp_flags);
324
325struct btrfs_mapping_tree;
326
327int repair_io_failure(struct btrfs_mapping_tree *map_tree, u64 start,
328 u64 length, u64 logical, struct page *page,
329 int mirror_num);
330int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
331int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
332 int mirror_num);
333#endif