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1/* SPDX-License-Identifier: GPL-2.0 */
2
3#ifndef BTRFS_EXTENT_IO_H
4#define BTRFS_EXTENT_IO_H
5
6#include <linux/rbtree.h>
7#include <linux/refcount.h>
8#include <linux/fiemap.h>
9#include "ulist.h"
10
11/*
12 * flags for bio submission. The high bits indicate the compression
13 * type for this bio
14 */
15#define EXTENT_BIO_COMPRESSED 1
16#define EXTENT_BIO_FLAG_SHIFT 16
17
18enum {
19 EXTENT_BUFFER_UPTODATE,
20 EXTENT_BUFFER_DIRTY,
21 EXTENT_BUFFER_CORRUPT,
22 /* this got triggered by readahead */
23 EXTENT_BUFFER_READAHEAD,
24 EXTENT_BUFFER_TREE_REF,
25 EXTENT_BUFFER_STALE,
26 EXTENT_BUFFER_WRITEBACK,
27 /* read IO error */
28 EXTENT_BUFFER_READ_ERR,
29 EXTENT_BUFFER_UNMAPPED,
30 EXTENT_BUFFER_IN_TREE,
31 /* write IO error */
32 EXTENT_BUFFER_WRITE_ERR,
33};
34
35/* these are flags for __process_pages_contig */
36#define PAGE_UNLOCK (1 << 0)
37#define PAGE_CLEAR_DIRTY (1 << 1)
38#define PAGE_SET_WRITEBACK (1 << 2)
39#define PAGE_END_WRITEBACK (1 << 3)
40#define PAGE_SET_PRIVATE2 (1 << 4)
41#define PAGE_SET_ERROR (1 << 5)
42#define PAGE_LOCK (1 << 6)
43
44/*
45 * page->private values. Every page that is controlled by the extent
46 * map has page->private set to one.
47 */
48#define EXTENT_PAGE_PRIVATE 1
49
50/*
51 * The extent buffer bitmap operations are done with byte granularity instead of
52 * word granularity for two reasons:
53 * 1. The bitmaps must be little-endian on disk.
54 * 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
55 * single word in a bitmap may straddle two pages in the extent buffer.
56 */
57#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
58#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
59#define BITMAP_FIRST_BYTE_MASK(start) \
60 ((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
61#define BITMAP_LAST_BYTE_MASK(nbits) \
62 (BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
63
64struct btrfs_root;
65struct btrfs_inode;
66struct btrfs_io_bio;
67struct io_failure_record;
68struct extent_io_tree;
69
70typedef blk_status_t (submit_bio_hook_t)(struct inode *inode, struct bio *bio,
71 int mirror_num,
72 unsigned long bio_flags);
73
74typedef blk_status_t (extent_submit_bio_start_t)(void *private_data,
75 struct bio *bio, u64 bio_offset);
76
77struct extent_io_ops {
78 /*
79 * The following callbacks must be always defined, the function
80 * pointer will be called unconditionally.
81 */
82 submit_bio_hook_t *submit_bio_hook;
83 int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset,
84 struct page *page, u64 start, u64 end,
85 int mirror);
86};
87
88
89#define INLINE_EXTENT_BUFFER_PAGES 16
90#define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_SIZE)
91struct extent_buffer {
92 u64 start;
93 unsigned long len;
94 unsigned long bflags;
95 struct btrfs_fs_info *fs_info;
96 spinlock_t refs_lock;
97 atomic_t refs;
98 atomic_t io_pages;
99 int read_mirror;
100 struct rcu_head rcu_head;
101 pid_t lock_owner;
102
103 int blocking_writers;
104 atomic_t blocking_readers;
105 bool lock_nested;
106 /* >= 0 if eb belongs to a log tree, -1 otherwise */
107 short log_index;
108
109 /* protects write locks */
110 rwlock_t lock;
111
112 /* readers use lock_wq while they wait for the write
113 * lock holders to unlock
114 */
115 wait_queue_head_t write_lock_wq;
116
117 /* writers use read_lock_wq while they wait for readers
118 * to unlock
119 */
120 wait_queue_head_t read_lock_wq;
121 struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
122#ifdef CONFIG_BTRFS_DEBUG
123 int spinning_writers;
124 atomic_t spinning_readers;
125 atomic_t read_locks;
126 int write_locks;
127 struct list_head leak_list;
128#endif
129};
130
131/*
132 * Structure to record how many bytes and which ranges are set/cleared
133 */
134struct extent_changeset {
135 /* How many bytes are set/cleared in this operation */
136 unsigned int bytes_changed;
137
138 /* Changed ranges */
139 struct ulist range_changed;
140};
141
142static inline void extent_changeset_init(struct extent_changeset *changeset)
143{
144 changeset->bytes_changed = 0;
145 ulist_init(&changeset->range_changed);
146}
147
148static inline struct extent_changeset *extent_changeset_alloc(void)
149{
150 struct extent_changeset *ret;
151
152 ret = kmalloc(sizeof(*ret), GFP_KERNEL);
153 if (!ret)
154 return NULL;
155
156 extent_changeset_init(ret);
157 return ret;
158}
159
160static inline void extent_changeset_release(struct extent_changeset *changeset)
161{
162 if (!changeset)
163 return;
164 changeset->bytes_changed = 0;
165 ulist_release(&changeset->range_changed);
166}
167
168static inline void extent_changeset_free(struct extent_changeset *changeset)
169{
170 if (!changeset)
171 return;
172 extent_changeset_release(changeset);
173 kfree(changeset);
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 btrfs_inode *inode,
190 struct page *page, size_t pg_offset,
191 u64 start, u64 len);
192
193int try_release_extent_mapping(struct page *page, gfp_t mask);
194int try_release_extent_buffer(struct page *page);
195
196int extent_read_full_page(struct page *page, get_extent_t *get_extent,
197 int mirror_num);
198int extent_write_full_page(struct page *page, struct writeback_control *wbc);
199int extent_write_locked_range(struct inode *inode, u64 start, u64 end,
200 int mode);
201int extent_writepages(struct address_space *mapping,
202 struct writeback_control *wbc);
203int btree_write_cache_pages(struct address_space *mapping,
204 struct writeback_control *wbc);
205void extent_readahead(struct readahead_control *rac);
206int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
207 u64 start, u64 len);
208void set_page_extent_mapped(struct page *page);
209
210struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
211 u64 start);
212struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
213 u64 start, unsigned long len);
214struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
215 u64 start);
216struct extent_buffer *btrfs_clone_extent_buffer(const struct extent_buffer *src);
217struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
218 u64 start);
219void free_extent_buffer(struct extent_buffer *eb);
220void free_extent_buffer_stale(struct extent_buffer *eb);
221#define WAIT_NONE 0
222#define WAIT_COMPLETE 1
223#define WAIT_PAGE_LOCK 2
224int read_extent_buffer_pages(struct extent_buffer *eb, int wait,
225 int mirror_num);
226void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
227
228static inline int num_extent_pages(const struct extent_buffer *eb)
229{
230 return (round_up(eb->start + eb->len, PAGE_SIZE) >> PAGE_SHIFT) -
231 (eb->start >> PAGE_SHIFT);
232}
233
234static inline int extent_buffer_uptodate(const struct extent_buffer *eb)
235{
236 return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
237}
238
239int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
240 unsigned long start, unsigned long len);
241void read_extent_buffer(const struct extent_buffer *eb, void *dst,
242 unsigned long start,
243 unsigned long len);
244int read_extent_buffer_to_user_nofault(const struct extent_buffer *eb,
245 void __user *dst, unsigned long start,
246 unsigned long len);
247void write_extent_buffer_fsid(const struct extent_buffer *eb, const void *src);
248void write_extent_buffer_chunk_tree_uuid(const struct extent_buffer *eb,
249 const void *src);
250void write_extent_buffer(const struct extent_buffer *eb, const void *src,
251 unsigned long start, unsigned long len);
252void copy_extent_buffer_full(const struct extent_buffer *dst,
253 const struct extent_buffer *src);
254void copy_extent_buffer(const struct extent_buffer *dst,
255 const struct extent_buffer *src,
256 unsigned long dst_offset, unsigned long src_offset,
257 unsigned long len);
258void memcpy_extent_buffer(const struct extent_buffer *dst,
259 unsigned long dst_offset, unsigned long src_offset,
260 unsigned long len);
261void memmove_extent_buffer(const struct extent_buffer *dst,
262 unsigned long dst_offset, unsigned long src_offset,
263 unsigned long len);
264void memzero_extent_buffer(const struct extent_buffer *eb, unsigned long start,
265 unsigned long len);
266int extent_buffer_test_bit(const struct extent_buffer *eb, unsigned long start,
267 unsigned long pos);
268void extent_buffer_bitmap_set(const struct extent_buffer *eb, unsigned long start,
269 unsigned long pos, unsigned long len);
270void extent_buffer_bitmap_clear(const struct extent_buffer *eb,
271 unsigned long start, unsigned long pos,
272 unsigned long len);
273void clear_extent_buffer_dirty(const struct extent_buffer *eb);
274bool set_extent_buffer_dirty(struct extent_buffer *eb);
275void set_extent_buffer_uptodate(struct extent_buffer *eb);
276void clear_extent_buffer_uptodate(struct extent_buffer *eb);
277int extent_buffer_under_io(const struct extent_buffer *eb);
278void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
279void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
280void extent_clear_unlock_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
281 struct page *locked_page,
282 unsigned bits_to_clear,
283 unsigned long page_ops);
284struct bio *btrfs_bio_alloc(u64 first_byte);
285struct bio *btrfs_io_bio_alloc(unsigned int nr_iovecs);
286struct bio *btrfs_bio_clone(struct bio *bio);
287struct bio *btrfs_bio_clone_partial(struct bio *orig, int offset, int size);
288
289struct btrfs_fs_info;
290struct btrfs_inode;
291
292int repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start,
293 u64 length, u64 logical, struct page *page,
294 unsigned int pg_offset, int mirror_num);
295void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
296int btrfs_repair_eb_io_failure(const struct extent_buffer *eb, int mirror_num);
297
298/*
299 * When IO fails, either with EIO or csum verification fails, we
300 * try other mirrors that might have a good copy of the data. This
301 * io_failure_record is used to record state as we go through all the
302 * mirrors. If another mirror has good data, the page is set up to date
303 * and things continue. If a good mirror can't be found, the original
304 * bio end_io callback is called to indicate things have failed.
305 */
306struct io_failure_record {
307 struct page *page;
308 u64 start;
309 u64 len;
310 u64 logical;
311 unsigned long bio_flags;
312 int this_mirror;
313 int failed_mirror;
314 int in_validation;
315};
316
317
318blk_status_t btrfs_submit_read_repair(struct inode *inode,
319 struct bio *failed_bio, u64 phy_offset,
320 struct page *page, unsigned int pgoff,
321 u64 start, u64 end, int failed_mirror,
322 submit_bio_hook_t *submit_bio_hook);
323
324#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
325bool find_lock_delalloc_range(struct inode *inode,
326 struct page *locked_page, u64 *start,
327 u64 *end);
328#endif
329struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
330 u64 start);
331
332#ifdef CONFIG_BTRFS_DEBUG
333void btrfs_extent_buffer_leak_debug_check(struct btrfs_fs_info *fs_info);
334#else
335#define btrfs_extent_buffer_leak_debug_check(fs_info) do {} while (0)
336#endif
337
338#endif
1/* SPDX-License-Identifier: GPL-2.0 */
2
3#ifndef BTRFS_EXTENT_IO_H
4#define BTRFS_EXTENT_IO_H
5
6#include <linux/rbtree.h>
7#include <linux/refcount.h>
8#include <linux/fiemap.h>
9#include <linux/btrfs_tree.h>
10#include "ulist.h"
11
12/*
13 * flags for bio submission. The high bits indicate the compression
14 * type for this bio
15 */
16#define EXTENT_BIO_COMPRESSED 1
17#define EXTENT_BIO_FLAG_SHIFT 16
18
19enum {
20 EXTENT_BUFFER_UPTODATE,
21 EXTENT_BUFFER_DIRTY,
22 EXTENT_BUFFER_CORRUPT,
23 /* this got triggered by readahead */
24 EXTENT_BUFFER_READAHEAD,
25 EXTENT_BUFFER_TREE_REF,
26 EXTENT_BUFFER_STALE,
27 EXTENT_BUFFER_WRITEBACK,
28 /* read IO error */
29 EXTENT_BUFFER_READ_ERR,
30 EXTENT_BUFFER_UNMAPPED,
31 EXTENT_BUFFER_IN_TREE,
32 /* write IO error */
33 EXTENT_BUFFER_WRITE_ERR,
34 EXTENT_BUFFER_NO_CHECK,
35};
36
37/* these are flags for __process_pages_contig */
38#define PAGE_UNLOCK (1 << 0)
39/* Page starts writeback, clear dirty bit and set writeback bit */
40#define PAGE_START_WRITEBACK (1 << 1)
41#define PAGE_END_WRITEBACK (1 << 2)
42#define PAGE_SET_ORDERED (1 << 3)
43#define PAGE_SET_ERROR (1 << 4)
44#define PAGE_LOCK (1 << 5)
45
46/*
47 * page->private values. Every page that is controlled by the extent
48 * map has page->private set to one.
49 */
50#define EXTENT_PAGE_PRIVATE 1
51
52/*
53 * The extent buffer bitmap operations are done with byte granularity instead of
54 * word granularity for two reasons:
55 * 1. The bitmaps must be little-endian on disk.
56 * 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
57 * single word in a bitmap may straddle two pages in the extent buffer.
58 */
59#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
60#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
61#define BITMAP_FIRST_BYTE_MASK(start) \
62 ((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
63#define BITMAP_LAST_BYTE_MASK(nbits) \
64 (BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
65
66struct btrfs_root;
67struct btrfs_inode;
68struct btrfs_io_bio;
69struct btrfs_fs_info;
70struct io_failure_record;
71struct extent_io_tree;
72
73typedef blk_status_t (submit_bio_hook_t)(struct inode *inode, struct bio *bio,
74 int mirror_num,
75 unsigned long bio_flags);
76
77typedef blk_status_t (extent_submit_bio_start_t)(struct inode *inode,
78 struct bio *bio, u64 dio_file_offset);
79
80#define INLINE_EXTENT_BUFFER_PAGES (BTRFS_MAX_METADATA_BLOCKSIZE / PAGE_SIZE)
81struct extent_buffer {
82 u64 start;
83 unsigned long len;
84 unsigned long bflags;
85 struct btrfs_fs_info *fs_info;
86 spinlock_t refs_lock;
87 atomic_t refs;
88 atomic_t io_pages;
89 int read_mirror;
90 struct rcu_head rcu_head;
91 pid_t lock_owner;
92 /* >= 0 if eb belongs to a log tree, -1 otherwise */
93 s8 log_index;
94
95 struct rw_semaphore lock;
96
97 struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
98 struct list_head release_list;
99#ifdef CONFIG_BTRFS_DEBUG
100 struct list_head leak_list;
101#endif
102};
103
104/*
105 * Structure to record info about the bio being assembled, and other info like
106 * how many bytes are there before stripe/ordered extent boundary.
107 */
108struct btrfs_bio_ctrl {
109 struct bio *bio;
110 unsigned long bio_flags;
111 u32 len_to_stripe_boundary;
112 u32 len_to_oe_boundary;
113};
114
115/*
116 * Structure to record how many bytes and which ranges are set/cleared
117 */
118struct extent_changeset {
119 /* How many bytes are set/cleared in this operation */
120 unsigned int bytes_changed;
121
122 /* Changed ranges */
123 struct ulist range_changed;
124};
125
126static inline void extent_changeset_init(struct extent_changeset *changeset)
127{
128 changeset->bytes_changed = 0;
129 ulist_init(&changeset->range_changed);
130}
131
132static inline struct extent_changeset *extent_changeset_alloc(void)
133{
134 struct extent_changeset *ret;
135
136 ret = kmalloc(sizeof(*ret), GFP_KERNEL);
137 if (!ret)
138 return NULL;
139
140 extent_changeset_init(ret);
141 return ret;
142}
143
144static inline void extent_changeset_release(struct extent_changeset *changeset)
145{
146 if (!changeset)
147 return;
148 changeset->bytes_changed = 0;
149 ulist_release(&changeset->range_changed);
150}
151
152static inline void extent_changeset_free(struct extent_changeset *changeset)
153{
154 if (!changeset)
155 return;
156 extent_changeset_release(changeset);
157 kfree(changeset);
158}
159
160static inline void extent_set_compress_type(unsigned long *bio_flags,
161 int compress_type)
162{
163 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
164}
165
166static inline int extent_compress_type(unsigned long bio_flags)
167{
168 return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
169}
170
171struct extent_map_tree;
172
173typedef struct extent_map *(get_extent_t)(struct btrfs_inode *inode,
174 struct page *page, size_t pg_offset,
175 u64 start, u64 len);
176
177int try_release_extent_mapping(struct page *page, gfp_t mask);
178int try_release_extent_buffer(struct page *page);
179
180int __must_check submit_one_bio(struct bio *bio, int mirror_num,
181 unsigned long bio_flags);
182int btrfs_do_readpage(struct page *page, struct extent_map **em_cached,
183 struct btrfs_bio_ctrl *bio_ctrl,
184 unsigned int read_flags, u64 *prev_em_start);
185int extent_write_full_page(struct page *page, struct writeback_control *wbc);
186int extent_write_locked_range(struct inode *inode, u64 start, u64 end,
187 int mode);
188int extent_writepages(struct address_space *mapping,
189 struct writeback_control *wbc);
190int btree_write_cache_pages(struct address_space *mapping,
191 struct writeback_control *wbc);
192void extent_readahead(struct readahead_control *rac);
193int extent_fiemap(struct btrfs_inode *inode, struct fiemap_extent_info *fieinfo,
194 u64 start, u64 len);
195int set_page_extent_mapped(struct page *page);
196void clear_page_extent_mapped(struct page *page);
197
198struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
199 u64 start, u64 owner_root, int level);
200struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
201 u64 start, unsigned long len);
202struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
203 u64 start);
204struct extent_buffer *btrfs_clone_extent_buffer(const struct extent_buffer *src);
205struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
206 u64 start);
207void free_extent_buffer(struct extent_buffer *eb);
208void free_extent_buffer_stale(struct extent_buffer *eb);
209#define WAIT_NONE 0
210#define WAIT_COMPLETE 1
211#define WAIT_PAGE_LOCK 2
212int read_extent_buffer_pages(struct extent_buffer *eb, int wait,
213 int mirror_num);
214void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
215void btrfs_readahead_tree_block(struct btrfs_fs_info *fs_info,
216 u64 bytenr, u64 owner_root, u64 gen, int level);
217void btrfs_readahead_node_child(struct extent_buffer *node, int slot);
218
219static inline int num_extent_pages(const struct extent_buffer *eb)
220{
221 /*
222 * For sectorsize == PAGE_SIZE case, since nodesize is always aligned to
223 * sectorsize, it's just eb->len >> PAGE_SHIFT.
224 *
225 * For sectorsize < PAGE_SIZE case, we could have nodesize < PAGE_SIZE,
226 * thus have to ensure we get at least one page.
227 */
228 return (eb->len >> PAGE_SHIFT) ?: 1;
229}
230
231static inline int extent_buffer_uptodate(const struct extent_buffer *eb)
232{
233 return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
234}
235
236int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
237 unsigned long start, unsigned long len);
238void read_extent_buffer(const struct extent_buffer *eb, void *dst,
239 unsigned long start,
240 unsigned long len);
241int read_extent_buffer_to_user_nofault(const struct extent_buffer *eb,
242 void __user *dst, unsigned long start,
243 unsigned long len);
244void write_extent_buffer_fsid(const struct extent_buffer *eb, const void *src);
245void write_extent_buffer_chunk_tree_uuid(const struct extent_buffer *eb,
246 const void *src);
247void write_extent_buffer(const struct extent_buffer *eb, const void *src,
248 unsigned long start, unsigned long len);
249void copy_extent_buffer_full(const struct extent_buffer *dst,
250 const struct extent_buffer *src);
251void copy_extent_buffer(const struct extent_buffer *dst,
252 const struct extent_buffer *src,
253 unsigned long dst_offset, unsigned long src_offset,
254 unsigned long len);
255void memcpy_extent_buffer(const struct extent_buffer *dst,
256 unsigned long dst_offset, unsigned long src_offset,
257 unsigned long len);
258void memmove_extent_buffer(const struct extent_buffer *dst,
259 unsigned long dst_offset, unsigned long src_offset,
260 unsigned long len);
261void memzero_extent_buffer(const struct extent_buffer *eb, unsigned long start,
262 unsigned long len);
263int extent_buffer_test_bit(const struct extent_buffer *eb, unsigned long start,
264 unsigned long pos);
265void extent_buffer_bitmap_set(const struct extent_buffer *eb, unsigned long start,
266 unsigned long pos, unsigned long len);
267void extent_buffer_bitmap_clear(const struct extent_buffer *eb,
268 unsigned long start, unsigned long pos,
269 unsigned long len);
270void clear_extent_buffer_dirty(const struct extent_buffer *eb);
271bool set_extent_buffer_dirty(struct extent_buffer *eb);
272void set_extent_buffer_uptodate(struct extent_buffer *eb);
273void clear_extent_buffer_uptodate(struct extent_buffer *eb);
274int extent_buffer_under_io(const struct extent_buffer *eb);
275void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
276void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
277void extent_clear_unlock_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
278 struct page *locked_page,
279 u32 bits_to_clear, unsigned long page_ops);
280struct bio *btrfs_bio_alloc(u64 first_byte);
281struct bio *btrfs_io_bio_alloc(unsigned int nr_iovecs);
282struct bio *btrfs_bio_clone(struct bio *bio);
283struct bio *btrfs_bio_clone_partial(struct bio *orig, int offset, int size);
284
285int repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start,
286 u64 length, u64 logical, struct page *page,
287 unsigned int pg_offset, int mirror_num);
288void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
289int btrfs_repair_eb_io_failure(const struct extent_buffer *eb, int mirror_num);
290
291/*
292 * When IO fails, either with EIO or csum verification fails, we
293 * try other mirrors that might have a good copy of the data. This
294 * io_failure_record is used to record state as we go through all the
295 * mirrors. If another mirror has good data, the sector is set up to date
296 * and things continue. If a good mirror can't be found, the original
297 * bio end_io callback is called to indicate things have failed.
298 */
299struct io_failure_record {
300 struct page *page;
301 u64 start;
302 u64 len;
303 u64 logical;
304 unsigned long bio_flags;
305 int this_mirror;
306 int failed_mirror;
307};
308
309int btrfs_repair_one_sector(struct inode *inode,
310 struct bio *failed_bio, u32 bio_offset,
311 struct page *page, unsigned int pgoff,
312 u64 start, int failed_mirror,
313 submit_bio_hook_t *submit_bio_hook);
314
315#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
316bool find_lock_delalloc_range(struct inode *inode,
317 struct page *locked_page, u64 *start,
318 u64 *end);
319#endif
320struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
321 u64 start);
322
323#ifdef CONFIG_BTRFS_DEBUG
324void btrfs_extent_buffer_leak_debug_check(struct btrfs_fs_info *fs_info);
325#else
326#define btrfs_extent_buffer_leak_debug_check(fs_info) do {} while (0)
327#endif
328
329#endif