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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 <linux/btrfs_tree.h>
10#include "compression.h"
11#include "ulist.h"
12#include "misc.h"
13
14struct btrfs_trans_handle;
15
16enum {
17 EXTENT_BUFFER_UPTODATE,
18 EXTENT_BUFFER_DIRTY,
19 EXTENT_BUFFER_CORRUPT,
20 /* this got triggered by readahead */
21 EXTENT_BUFFER_READAHEAD,
22 EXTENT_BUFFER_TREE_REF,
23 EXTENT_BUFFER_STALE,
24 EXTENT_BUFFER_WRITEBACK,
25 /* read IO error */
26 EXTENT_BUFFER_READ_ERR,
27 EXTENT_BUFFER_UNMAPPED,
28 EXTENT_BUFFER_IN_TREE,
29 /* write IO error */
30 EXTENT_BUFFER_WRITE_ERR,
31 /* Indicate the extent buffer is written zeroed out (for zoned) */
32 EXTENT_BUFFER_ZONED_ZEROOUT,
33 /* Indicate that extent buffer pages a being read */
34 EXTENT_BUFFER_READING,
35};
36
37/* these are flags for __process_pages_contig */
38enum {
39 ENUM_BIT(PAGE_UNLOCK),
40 /* Page starts writeback, clear dirty bit and set writeback bit */
41 ENUM_BIT(PAGE_START_WRITEBACK),
42 ENUM_BIT(PAGE_END_WRITEBACK),
43 ENUM_BIT(PAGE_SET_ORDERED),
44};
45
46/*
47 * Folio private values. Every page that is controlled by the extent map has
48 * folio private set to this value.
49 */
50#define EXTENT_FOLIO_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_fs_info;
69struct extent_io_tree;
70struct btrfs_tree_parent_check;
71
72int __init extent_buffer_init_cachep(void);
73void __cold extent_buffer_free_cachep(void);
74
75#define INLINE_EXTENT_BUFFER_PAGES (BTRFS_MAX_METADATA_BLOCKSIZE / PAGE_SIZE)
76struct extent_buffer {
77 u64 start;
78 unsigned long len;
79 unsigned long bflags;
80 struct btrfs_fs_info *fs_info;
81
82 /*
83 * The address where the eb can be accessed without any cross-page handling.
84 * This can be NULL if not possible.
85 */
86 void *addr;
87
88 spinlock_t refs_lock;
89 atomic_t refs;
90 int read_mirror;
91 /* >= 0 if eb belongs to a log tree, -1 otherwise */
92 s8 log_index;
93 struct rcu_head rcu_head;
94
95 struct rw_semaphore lock;
96
97 /*
98 * Pointers to all the folios of the extent buffer.
99 *
100 * For now the folio is always order 0 (aka, a single page).
101 */
102 struct folio *folios[INLINE_EXTENT_BUFFER_PAGES];
103#ifdef CONFIG_BTRFS_DEBUG
104 struct list_head leak_list;
105 pid_t lock_owner;
106#endif
107};
108
109struct btrfs_eb_write_context {
110 struct writeback_control *wbc;
111 struct extent_buffer *eb;
112 /* Block group @eb resides in. Only used for zoned mode. */
113 struct btrfs_block_group *zoned_bg;
114};
115
116/*
117 * Get the correct offset inside the page of extent buffer.
118 *
119 * @eb: target extent buffer
120 * @start: offset inside the extent buffer
121 *
122 * Will handle both sectorsize == PAGE_SIZE and sectorsize < PAGE_SIZE cases.
123 */
124static inline size_t get_eb_offset_in_folio(const struct extent_buffer *eb,
125 unsigned long offset)
126{
127 /*
128 * 1) sectorsize == PAGE_SIZE and nodesize >= PAGE_SIZE case
129 * 1.1) One large folio covering the whole eb
130 * The eb->start is aligned to folio size, thus adding it
131 * won't cause any difference.
132 * 1.2) Several page sized folios
133 * The eb->start is aligned to folio (page) size, thus
134 * adding it won't cause any difference.
135 *
136 * 2) sectorsize < PAGE_SIZE and nodesize < PAGE_SIZE case
137 * In this case there would only be one page sized folio, and there
138 * may be several different extent buffers in the page/folio.
139 * We need to add eb->start to properly access the offset inside
140 * that eb.
141 */
142 return offset_in_folio(eb->folios[0], offset + eb->start);
143}
144
145static inline unsigned long get_eb_folio_index(const struct extent_buffer *eb,
146 unsigned long offset)
147{
148 /*
149 * 1) sectorsize == PAGE_SIZE and nodesize >= PAGE_SIZE case
150 * 1.1) One large folio covering the whole eb.
151 * the folio_shift would be large enough to always make us
152 * return 0 as index.
153 * 1.2) Several page sized folios
154 * The folio_shift() would be PAGE_SHIFT, giving us the correct
155 * index.
156 *
157 * 2) sectorsize < PAGE_SIZE and nodesize < PAGE_SIZE case
158 * The folio would only be page sized, and always give us 0 as index.
159 */
160 return offset >> folio_shift(eb->folios[0]);
161}
162
163/*
164 * Structure to record how many bytes and which ranges are set/cleared
165 */
166struct extent_changeset {
167 /* How many bytes are set/cleared in this operation */
168 u64 bytes_changed;
169
170 /* Changed ranges */
171 struct ulist range_changed;
172};
173
174static inline void extent_changeset_init(struct extent_changeset *changeset)
175{
176 changeset->bytes_changed = 0;
177 ulist_init(&changeset->range_changed);
178}
179
180static inline struct extent_changeset *extent_changeset_alloc(void)
181{
182 struct extent_changeset *ret;
183
184 ret = kmalloc(sizeof(*ret), GFP_KERNEL);
185 if (!ret)
186 return NULL;
187
188 extent_changeset_init(ret);
189 return ret;
190}
191
192static inline void extent_changeset_release(struct extent_changeset *changeset)
193{
194 if (!changeset)
195 return;
196 changeset->bytes_changed = 0;
197 ulist_release(&changeset->range_changed);
198}
199
200static inline void extent_changeset_free(struct extent_changeset *changeset)
201{
202 if (!changeset)
203 return;
204 extent_changeset_release(changeset);
205 kfree(changeset);
206}
207
208struct extent_map_tree;
209
210int try_release_extent_mapping(struct page *page, gfp_t mask);
211int try_release_extent_buffer(struct page *page);
212
213int btrfs_read_folio(struct file *file, struct folio *folio);
214void extent_write_locked_range(struct inode *inode, struct page *locked_page,
215 u64 start, u64 end, struct writeback_control *wbc,
216 bool pages_dirty);
217int extent_writepages(struct address_space *mapping,
218 struct writeback_control *wbc);
219int btree_write_cache_pages(struct address_space *mapping,
220 struct writeback_control *wbc);
221void extent_readahead(struct readahead_control *rac);
222int extent_fiemap(struct btrfs_inode *inode, struct fiemap_extent_info *fieinfo,
223 u64 start, u64 len);
224int set_page_extent_mapped(struct page *page);
225void clear_page_extent_mapped(struct page *page);
226
227struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
228 u64 start, u64 owner_root, int level);
229struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
230 u64 start, unsigned long len);
231struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
232 u64 start);
233struct extent_buffer *btrfs_clone_extent_buffer(const struct extent_buffer *src);
234struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
235 u64 start);
236void free_extent_buffer(struct extent_buffer *eb);
237void free_extent_buffer_stale(struct extent_buffer *eb);
238#define WAIT_NONE 0
239#define WAIT_COMPLETE 1
240#define WAIT_PAGE_LOCK 2
241int read_extent_buffer_pages(struct extent_buffer *eb, int wait, int mirror_num,
242 struct btrfs_tree_parent_check *parent_check);
243void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
244void btrfs_readahead_tree_block(struct btrfs_fs_info *fs_info,
245 u64 bytenr, u64 owner_root, u64 gen, int level);
246void btrfs_readahead_node_child(struct extent_buffer *node, int slot);
247
248static inline int num_extent_pages(const struct extent_buffer *eb)
249{
250 /*
251 * For sectorsize == PAGE_SIZE case, since nodesize is always aligned to
252 * sectorsize, it's just eb->len >> PAGE_SHIFT.
253 *
254 * For sectorsize < PAGE_SIZE case, we could have nodesize < PAGE_SIZE,
255 * thus have to ensure we get at least one page.
256 */
257 return (eb->len >> PAGE_SHIFT) ?: 1;
258}
259
260/*
261 * This can only be determined at runtime by checking eb::folios[0].
262 *
263 * As we can have either one large folio covering the whole eb
264 * (either nodesize <= PAGE_SIZE, or high order folio), or multiple
265 * single-paged folios.
266 */
267static inline int num_extent_folios(const struct extent_buffer *eb)
268{
269 if (folio_order(eb->folios[0]))
270 return 1;
271 return num_extent_pages(eb);
272}
273
274static inline int extent_buffer_uptodate(const struct extent_buffer *eb)
275{
276 return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
277}
278
279int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
280 unsigned long start, unsigned long len);
281void read_extent_buffer(const struct extent_buffer *eb, void *dst,
282 unsigned long start,
283 unsigned long len);
284int read_extent_buffer_to_user_nofault(const struct extent_buffer *eb,
285 void __user *dst, unsigned long start,
286 unsigned long len);
287void write_extent_buffer(const struct extent_buffer *eb, const void *src,
288 unsigned long start, unsigned long len);
289
290static inline void write_extent_buffer_chunk_tree_uuid(
291 const struct extent_buffer *eb, const void *chunk_tree_uuid)
292{
293 write_extent_buffer(eb, chunk_tree_uuid,
294 offsetof(struct btrfs_header, chunk_tree_uuid),
295 BTRFS_FSID_SIZE);
296}
297
298static inline void write_extent_buffer_fsid(const struct extent_buffer *eb,
299 const void *fsid)
300{
301 write_extent_buffer(eb, fsid, offsetof(struct btrfs_header, fsid),
302 BTRFS_FSID_SIZE);
303}
304
305void copy_extent_buffer_full(const struct extent_buffer *dst,
306 const struct extent_buffer *src);
307void copy_extent_buffer(const struct extent_buffer *dst,
308 const struct extent_buffer *src,
309 unsigned long dst_offset, unsigned long src_offset,
310 unsigned long len);
311void memcpy_extent_buffer(const struct extent_buffer *dst,
312 unsigned long dst_offset, unsigned long src_offset,
313 unsigned long len);
314void memmove_extent_buffer(const struct extent_buffer *dst,
315 unsigned long dst_offset, unsigned long src_offset,
316 unsigned long len);
317void memzero_extent_buffer(const struct extent_buffer *eb, unsigned long start,
318 unsigned long len);
319int extent_buffer_test_bit(const struct extent_buffer *eb, unsigned long start,
320 unsigned long pos);
321void extent_buffer_bitmap_set(const struct extent_buffer *eb, unsigned long start,
322 unsigned long pos, unsigned long len);
323void extent_buffer_bitmap_clear(const struct extent_buffer *eb,
324 unsigned long start, unsigned long pos,
325 unsigned long len);
326void set_extent_buffer_dirty(struct extent_buffer *eb);
327void set_extent_buffer_uptodate(struct extent_buffer *eb);
328void clear_extent_buffer_uptodate(struct extent_buffer *eb);
329void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
330void extent_clear_unlock_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
331 struct page *locked_page,
332 u32 bits_to_clear, unsigned long page_ops);
333int extent_invalidate_folio(struct extent_io_tree *tree,
334 struct folio *folio, size_t offset);
335void btrfs_clear_buffer_dirty(struct btrfs_trans_handle *trans,
336 struct extent_buffer *buf);
337
338int btrfs_alloc_page_array(unsigned int nr_pages, struct page **page_array,
339 gfp_t extra_gfp);
340
341#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
342bool find_lock_delalloc_range(struct inode *inode,
343 struct page *locked_page, u64 *start,
344 u64 *end);
345#endif
346struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
347 u64 start);
348
349#ifdef CONFIG_BTRFS_DEBUG
350void btrfs_extent_buffer_leak_debug_check(struct btrfs_fs_info *fs_info);
351#else
352#define btrfs_extent_buffer_leak_debug_check(fs_info) do {} while (0)
353#endif
354
355#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 "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