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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#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