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