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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 <linux/spinlock.h>
11#include <linux/atomic.h>
12#include <linux/rwsem.h>
13#include <linux/list.h>
14#include <linux/slab.h>
15#include "compression.h"
16#include "messages.h"
17#include "ulist.h"
18#include "misc.h"
19
20struct page;
21struct file;
22struct folio;
23struct inode;
24struct fiemap_extent_info;
25struct readahead_control;
26struct address_space;
27struct writeback_control;
28struct extent_io_tree;
29struct extent_map_tree;
30struct btrfs_block_group;
31struct btrfs_fs_info;
32struct btrfs_inode;
33struct btrfs_root;
34struct btrfs_trans_handle;
35struct btrfs_tree_parent_check;
36
37enum {
38 EXTENT_BUFFER_UPTODATE,
39 EXTENT_BUFFER_DIRTY,
40 EXTENT_BUFFER_CORRUPT,
41 /* this got triggered by readahead */
42 EXTENT_BUFFER_READAHEAD,
43 EXTENT_BUFFER_TREE_REF,
44 EXTENT_BUFFER_STALE,
45 EXTENT_BUFFER_WRITEBACK,
46 /* read IO error */
47 EXTENT_BUFFER_READ_ERR,
48 EXTENT_BUFFER_UNMAPPED,
49 EXTENT_BUFFER_IN_TREE,
50 /* write IO error */
51 EXTENT_BUFFER_WRITE_ERR,
52 /* Indicate the extent buffer is written zeroed out (for zoned) */
53 EXTENT_BUFFER_ZONED_ZEROOUT,
54 /* Indicate that extent buffer pages a being read */
55 EXTENT_BUFFER_READING,
56};
57
58/* these are flags for __process_pages_contig */
59enum {
60 ENUM_BIT(PAGE_UNLOCK),
61 /* Page starts writeback, clear dirty bit and set writeback bit */
62 ENUM_BIT(PAGE_START_WRITEBACK),
63 ENUM_BIT(PAGE_END_WRITEBACK),
64 ENUM_BIT(PAGE_SET_ORDERED),
65};
66
67/*
68 * Folio private values. Every page that is controlled by the extent map has
69 * folio private set to this value.
70 */
71#define EXTENT_FOLIO_PRIVATE 1
72
73/*
74 * The extent buffer bitmap operations are done with byte granularity instead of
75 * word granularity for two reasons:
76 * 1. The bitmaps must be little-endian on disk.
77 * 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
78 * single word in a bitmap may straddle two pages in the extent buffer.
79 */
80#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
81#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
82#define BITMAP_FIRST_BYTE_MASK(start) \
83 ((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
84#define BITMAP_LAST_BYTE_MASK(nbits) \
85 (BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
86
87
88int __init extent_buffer_init_cachep(void);
89void __cold extent_buffer_free_cachep(void);
90
91#define INLINE_EXTENT_BUFFER_PAGES (BTRFS_MAX_METADATA_BLOCKSIZE / PAGE_SIZE)
92struct extent_buffer {
93 u64 start;
94 u32 len;
95 u32 folio_size;
96 unsigned long bflags;
97 struct btrfs_fs_info *fs_info;
98
99 /*
100 * The address where the eb can be accessed without any cross-page handling.
101 * This can be NULL if not possible.
102 */
103 void *addr;
104
105 spinlock_t refs_lock;
106 atomic_t refs;
107 int read_mirror;
108 /* >= 0 if eb belongs to a log tree, -1 otherwise */
109 s8 log_index;
110 u8 folio_shift;
111 struct rcu_head rcu_head;
112
113 struct rw_semaphore lock;
114
115 /*
116 * Pointers to all the folios of the extent buffer.
117 *
118 * For now the folio is always order 0 (aka, a single page).
119 */
120 struct folio *folios[INLINE_EXTENT_BUFFER_PAGES];
121#ifdef CONFIG_BTRFS_DEBUG
122 struct list_head leak_list;
123 pid_t lock_owner;
124#endif
125};
126
127struct btrfs_eb_write_context {
128 struct writeback_control *wbc;
129 struct extent_buffer *eb;
130 /* Block group @eb resides in. Only used for zoned mode. */
131 struct btrfs_block_group *zoned_bg;
132};
133
134static inline unsigned long offset_in_eb_folio(const struct extent_buffer *eb,
135 u64 start)
136{
137 ASSERT(eb->folio_size);
138 return start & (eb->folio_size - 1);
139}
140
141/*
142 * Get the correct offset inside the page of extent buffer.
143 *
144 * @eb: target extent buffer
145 * @start: offset inside the extent buffer
146 *
147 * Will handle both sectorsize == PAGE_SIZE and sectorsize < PAGE_SIZE cases.
148 */
149static inline size_t get_eb_offset_in_folio(const struct extent_buffer *eb,
150 unsigned long offset)
151{
152 /*
153 * 1) sectorsize == PAGE_SIZE and nodesize >= PAGE_SIZE case
154 * 1.1) One large folio covering the whole eb
155 * The eb->start is aligned to folio size, thus adding it
156 * won't cause any difference.
157 * 1.2) Several page sized folios
158 * The eb->start is aligned to folio (page) size, thus
159 * adding it won't cause any difference.
160 *
161 * 2) sectorsize < PAGE_SIZE and nodesize < PAGE_SIZE case
162 * In this case there would only be one page sized folio, and there
163 * may be several different extent buffers in the page/folio.
164 * We need to add eb->start to properly access the offset inside
165 * that eb.
166 */
167 return offset_in_folio(eb->folios[0], offset + eb->start);
168}
169
170static inline unsigned long get_eb_folio_index(const struct extent_buffer *eb,
171 unsigned long offset)
172{
173 /*
174 * 1) sectorsize == PAGE_SIZE and nodesize >= PAGE_SIZE case
175 * 1.1) One large folio covering the whole eb.
176 * the folio_shift would be large enough to always make us
177 * return 0 as index.
178 * 1.2) Several page sized folios
179 * The folio_shift would be PAGE_SHIFT, giving us the correct
180 * index.
181 *
182 * 2) sectorsize < PAGE_SIZE and nodesize < PAGE_SIZE case
183 * The folio would only be page sized, and always give us 0 as index.
184 */
185 return offset >> eb->folio_shift;
186}
187
188/*
189 * Structure to record how many bytes and which ranges are set/cleared
190 */
191struct extent_changeset {
192 /* How many bytes are set/cleared in this operation */
193 u64 bytes_changed;
194
195 /* Changed ranges */
196 struct ulist range_changed;
197};
198
199static inline void extent_changeset_init(struct extent_changeset *changeset)
200{
201 changeset->bytes_changed = 0;
202 ulist_init(&changeset->range_changed);
203}
204
205static inline struct extent_changeset *extent_changeset_alloc(void)
206{
207 struct extent_changeset *ret;
208
209 ret = kmalloc(sizeof(*ret), GFP_KERNEL);
210 if (!ret)
211 return NULL;
212
213 extent_changeset_init(ret);
214 return ret;
215}
216
217static inline void extent_changeset_release(struct extent_changeset *changeset)
218{
219 if (!changeset)
220 return;
221 changeset->bytes_changed = 0;
222 ulist_release(&changeset->range_changed);
223}
224
225static inline void extent_changeset_free(struct extent_changeset *changeset)
226{
227 if (!changeset)
228 return;
229 extent_changeset_release(changeset);
230 kfree(changeset);
231}
232
233int try_release_extent_mapping(struct page *page, gfp_t mask);
234int try_release_extent_buffer(struct page *page);
235
236int btrfs_read_folio(struct file *file, struct folio *folio);
237void extent_write_locked_range(struct inode *inode, struct page *locked_page,
238 u64 start, u64 end, struct writeback_control *wbc,
239 bool pages_dirty);
240int extent_writepages(struct address_space *mapping,
241 struct writeback_control *wbc);
242int btree_write_cache_pages(struct address_space *mapping,
243 struct writeback_control *wbc);
244void extent_readahead(struct readahead_control *rac);
245int extent_fiemap(struct btrfs_inode *inode, struct fiemap_extent_info *fieinfo,
246 u64 start, u64 len);
247int set_folio_extent_mapped(struct folio *folio);
248int set_page_extent_mapped(struct page *page);
249void clear_page_extent_mapped(struct page *page);
250
251struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
252 u64 start, u64 owner_root, int level);
253struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
254 u64 start, unsigned long len);
255struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
256 u64 start);
257struct extent_buffer *btrfs_clone_extent_buffer(const struct extent_buffer *src);
258struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
259 u64 start);
260void free_extent_buffer(struct extent_buffer *eb);
261void free_extent_buffer_stale(struct extent_buffer *eb);
262#define WAIT_NONE 0
263#define WAIT_COMPLETE 1
264#define WAIT_PAGE_LOCK 2
265int read_extent_buffer_pages(struct extent_buffer *eb, int wait, int mirror_num,
266 struct btrfs_tree_parent_check *parent_check);
267void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
268void btrfs_readahead_tree_block(struct btrfs_fs_info *fs_info,
269 u64 bytenr, u64 owner_root, u64 gen, int level);
270void btrfs_readahead_node_child(struct extent_buffer *node, int slot);
271
272static inline int num_extent_pages(const struct extent_buffer *eb)
273{
274 /*
275 * For sectorsize == PAGE_SIZE case, since nodesize is always aligned to
276 * sectorsize, it's just eb->len >> PAGE_SHIFT.
277 *
278 * For sectorsize < PAGE_SIZE case, we could have nodesize < PAGE_SIZE,
279 * thus have to ensure we get at least one page.
280 */
281 return (eb->len >> PAGE_SHIFT) ?: 1;
282}
283
284/*
285 * This can only be determined at runtime by checking eb::folios[0].
286 *
287 * As we can have either one large folio covering the whole eb
288 * (either nodesize <= PAGE_SIZE, or high order folio), or multiple
289 * single-paged folios.
290 */
291static inline int num_extent_folios(const struct extent_buffer *eb)
292{
293 if (folio_order(eb->folios[0]))
294 return 1;
295 return num_extent_pages(eb);
296}
297
298static inline int extent_buffer_uptodate(const struct extent_buffer *eb)
299{
300 return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
301}
302
303int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
304 unsigned long start, unsigned long len);
305void read_extent_buffer(const struct extent_buffer *eb, void *dst,
306 unsigned long start,
307 unsigned long len);
308int read_extent_buffer_to_user_nofault(const struct extent_buffer *eb,
309 void __user *dst, unsigned long start,
310 unsigned long len);
311void write_extent_buffer(const struct extent_buffer *eb, const void *src,
312 unsigned long start, unsigned long len);
313
314static inline void write_extent_buffer_chunk_tree_uuid(
315 const struct extent_buffer *eb, const void *chunk_tree_uuid)
316{
317 write_extent_buffer(eb, chunk_tree_uuid,
318 offsetof(struct btrfs_header, chunk_tree_uuid),
319 BTRFS_FSID_SIZE);
320}
321
322static inline void write_extent_buffer_fsid(const struct extent_buffer *eb,
323 const void *fsid)
324{
325 write_extent_buffer(eb, fsid, offsetof(struct btrfs_header, fsid),
326 BTRFS_FSID_SIZE);
327}
328
329void copy_extent_buffer_full(const struct extent_buffer *dst,
330 const struct extent_buffer *src);
331void copy_extent_buffer(const struct extent_buffer *dst,
332 const struct extent_buffer *src,
333 unsigned long dst_offset, unsigned long src_offset,
334 unsigned long len);
335void memcpy_extent_buffer(const struct extent_buffer *dst,
336 unsigned long dst_offset, unsigned long src_offset,
337 unsigned long len);
338void memmove_extent_buffer(const struct extent_buffer *dst,
339 unsigned long dst_offset, unsigned long src_offset,
340 unsigned long len);
341void memzero_extent_buffer(const struct extent_buffer *eb, unsigned long start,
342 unsigned long len);
343int extent_buffer_test_bit(const struct extent_buffer *eb, unsigned long start,
344 unsigned long pos);
345void extent_buffer_bitmap_set(const struct extent_buffer *eb, unsigned long start,
346 unsigned long pos, unsigned long len);
347void extent_buffer_bitmap_clear(const struct extent_buffer *eb,
348 unsigned long start, unsigned long pos,
349 unsigned long len);
350void set_extent_buffer_dirty(struct extent_buffer *eb);
351void set_extent_buffer_uptodate(struct extent_buffer *eb);
352void clear_extent_buffer_uptodate(struct extent_buffer *eb);
353void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
354void extent_clear_unlock_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
355 struct page *locked_page,
356 u32 bits_to_clear, unsigned long page_ops);
357int extent_invalidate_folio(struct extent_io_tree *tree,
358 struct folio *folio, size_t offset);
359void btrfs_clear_buffer_dirty(struct btrfs_trans_handle *trans,
360 struct extent_buffer *buf);
361
362int btrfs_alloc_page_array(unsigned int nr_pages, struct page **page_array,
363 gfp_t extra_gfp);
364
365#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
366bool find_lock_delalloc_range(struct inode *inode,
367 struct page *locked_page, u64 *start,
368 u64 *end);
369#endif
370struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
371 u64 start);
372
373#ifdef CONFIG_BTRFS_DEBUG
374void btrfs_extent_buffer_leak_debug_check(struct btrfs_fs_info *fs_info);
375#else
376#define btrfs_extent_buffer_leak_debug_check(fs_info) do {} while (0)
377#endif
378
379#endif