Loading...
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#ifndef __EXTENTIO__
2#define __EXTENTIO__
3
4#include <linux/rbtree.h>
5
6/* bits for the extent state */
7#define EXTENT_DIRTY 1
8#define EXTENT_WRITEBACK (1 << 1)
9#define EXTENT_UPTODATE (1 << 2)
10#define EXTENT_LOCKED (1 << 3)
11#define EXTENT_NEW (1 << 4)
12#define EXTENT_DELALLOC (1 << 5)
13#define EXTENT_DEFRAG (1 << 6)
14#define EXTENT_DEFRAG_DONE (1 << 7)
15#define EXTENT_BUFFER_FILLED (1 << 8)
16#define EXTENT_BOUNDARY (1 << 9)
17#define EXTENT_NODATASUM (1 << 10)
18#define EXTENT_DO_ACCOUNTING (1 << 11)
19#define EXTENT_FIRST_DELALLOC (1 << 12)
20#define EXTENT_NEED_WAIT (1 << 13)
21#define EXTENT_DAMAGED (1 << 14)
22#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
23#define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
24
25/*
26 * flags for bio submission. The high bits indicate the compression
27 * type for this bio
28 */
29#define EXTENT_BIO_COMPRESSED 1
30#define EXTENT_BIO_FLAG_SHIFT 16
31
32/* these are bit numbers for test/set bit */
33#define EXTENT_BUFFER_UPTODATE 0
34#define EXTENT_BUFFER_BLOCKING 1
35#define EXTENT_BUFFER_DIRTY 2
36#define EXTENT_BUFFER_CORRUPT 3
37#define EXTENT_BUFFER_READAHEAD 4 /* this got triggered by readahead */
38#define EXTENT_BUFFER_TREE_REF 5
39#define EXTENT_BUFFER_STALE 6
40#define EXTENT_BUFFER_WRITEBACK 7
41#define EXTENT_BUFFER_IOERR 8
42#define EXTENT_BUFFER_DUMMY 9
43
44/* these are flags for extent_clear_unlock_delalloc */
45#define EXTENT_CLEAR_UNLOCK_PAGE 0x1
46#define EXTENT_CLEAR_UNLOCK 0x2
47#define EXTENT_CLEAR_DELALLOC 0x4
48#define EXTENT_CLEAR_DIRTY 0x8
49#define EXTENT_SET_WRITEBACK 0x10
50#define EXTENT_END_WRITEBACK 0x20
51#define EXTENT_SET_PRIVATE2 0x40
52#define EXTENT_CLEAR_ACCOUNTING 0x80
53
54/*
55 * page->private values. Every page that is controlled by the extent
56 * map has page->private set to one.
57 */
58#define EXTENT_PAGE_PRIVATE 1
59#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
60
61struct extent_state;
62struct btrfs_root;
63
64typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
65 struct bio *bio, int mirror_num,
66 unsigned long bio_flags, u64 bio_offset);
67struct extent_io_ops {
68 int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
69 u64 start, u64 end, int *page_started,
70 unsigned long *nr_written);
71 int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
72 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
73 extent_submit_bio_hook_t *submit_bio_hook;
74 int (*merge_bio_hook)(struct page *page, unsigned long offset,
75 size_t size, struct bio *bio,
76 unsigned long bio_flags);
77 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
78 int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
79 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
80 struct extent_state *state, int mirror);
81 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
82 struct extent_state *state, int uptodate);
83 void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
84 int *bits);
85 void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
86 int *bits);
87 void (*merge_extent_hook)(struct inode *inode,
88 struct extent_state *new,
89 struct extent_state *other);
90 void (*split_extent_hook)(struct inode *inode,
91 struct extent_state *orig, u64 split);
92 int (*write_cache_pages_lock_hook)(struct page *page, void *data,
93 void (*flush_fn)(void *));
94};
95
96struct extent_io_tree {
97 struct rb_root state;
98 struct radix_tree_root buffer;
99 struct address_space *mapping;
100 u64 dirty_bytes;
101 int track_uptodate;
102 spinlock_t lock;
103 spinlock_t buffer_lock;
104 struct extent_io_ops *ops;
105};
106
107struct extent_state {
108 u64 start;
109 u64 end; /* inclusive */
110 struct rb_node rb_node;
111
112 /* ADD NEW ELEMENTS AFTER THIS */
113 struct extent_io_tree *tree;
114 wait_queue_head_t wq;
115 atomic_t refs;
116 unsigned long state;
117
118 /* for use by the FS */
119 u64 private;
120
121 struct list_head leak_list;
122};
123
124#define INLINE_EXTENT_BUFFER_PAGES 16
125#define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
126struct extent_buffer {
127 u64 start;
128 unsigned long len;
129 unsigned long map_start;
130 unsigned long map_len;
131 unsigned long bflags;
132 struct extent_io_tree *tree;
133 spinlock_t refs_lock;
134 atomic_t refs;
135 atomic_t io_pages;
136 int read_mirror;
137 struct list_head leak_list;
138 struct rcu_head rcu_head;
139 pid_t lock_owner;
140
141 /* count of read lock holders on the extent buffer */
142 atomic_t write_locks;
143 atomic_t read_locks;
144 atomic_t blocking_writers;
145 atomic_t blocking_readers;
146 atomic_t spinning_readers;
147 atomic_t spinning_writers;
148 int lock_nested;
149
150 /* protects write locks */
151 rwlock_t lock;
152
153 /* readers use lock_wq while they wait for the write
154 * lock holders to unlock
155 */
156 wait_queue_head_t write_lock_wq;
157
158 /* writers use read_lock_wq while they wait for readers
159 * to unlock
160 */
161 wait_queue_head_t read_lock_wq;
162 wait_queue_head_t lock_wq;
163 struct page *inline_pages[INLINE_EXTENT_BUFFER_PAGES];
164 struct page **pages;
165};
166
167static inline void extent_set_compress_type(unsigned long *bio_flags,
168 int compress_type)
169{
170 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
171}
172
173static inline int extent_compress_type(unsigned long bio_flags)
174{
175 return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
176}
177
178struct extent_map_tree;
179
180typedef struct extent_map *(get_extent_t)(struct inode *inode,
181 struct page *page,
182 size_t pg_offset,
183 u64 start, u64 len,
184 int create);
185
186void extent_io_tree_init(struct extent_io_tree *tree,
187 struct address_space *mapping);
188int try_release_extent_mapping(struct extent_map_tree *map,
189 struct extent_io_tree *tree, struct page *page,
190 gfp_t mask);
191int try_release_extent_buffer(struct page *page, gfp_t mask);
192int try_release_extent_state(struct extent_map_tree *map,
193 struct extent_io_tree *tree, struct page *page,
194 gfp_t mask);
195int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
196int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
197 int bits, struct extent_state **cached);
198int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
199int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
200 struct extent_state **cached, gfp_t mask);
201int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
202int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
203 get_extent_t *get_extent, int mirror_num);
204int __init extent_io_init(void);
205void extent_io_exit(void);
206
207u64 count_range_bits(struct extent_io_tree *tree,
208 u64 *start, u64 search_end,
209 u64 max_bytes, unsigned long bits, int contig);
210
211void free_extent_state(struct extent_state *state);
212int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
213 int bits, int filled, struct extent_state *cached_state);
214int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
215 int bits, gfp_t mask);
216int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
217 int bits, int wake, int delete, struct extent_state **cached,
218 gfp_t mask);
219int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
220 int bits, gfp_t mask);
221int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
222 int bits, u64 *failed_start,
223 struct extent_state **cached_state, gfp_t mask);
224int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
225 struct extent_state **cached_state, gfp_t mask);
226int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
227 struct extent_state **cached_state, gfp_t mask);
228int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
229 gfp_t mask);
230int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
231 gfp_t mask);
232int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
233 gfp_t mask);
234int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
235 int bits, int clear_bits, gfp_t mask);
236int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
237 struct extent_state **cached_state, gfp_t mask);
238int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
239 u64 *start_ret, u64 *end_ret, int bits);
240struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
241 u64 start, int bits);
242int extent_invalidatepage(struct extent_io_tree *tree,
243 struct page *page, unsigned long offset);
244int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
245 get_extent_t *get_extent,
246 struct writeback_control *wbc);
247int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
248 u64 start, u64 end, get_extent_t *get_extent,
249 int mode);
250int extent_writepages(struct extent_io_tree *tree,
251 struct address_space *mapping,
252 get_extent_t *get_extent,
253 struct writeback_control *wbc);
254int btree_write_cache_pages(struct address_space *mapping,
255 struct writeback_control *wbc);
256int extent_readpages(struct extent_io_tree *tree,
257 struct address_space *mapping,
258 struct list_head *pages, unsigned nr_pages,
259 get_extent_t get_extent);
260int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
261 __u64 start, __u64 len, get_extent_t *get_extent);
262int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
263int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
264void set_page_extent_mapped(struct page *page);
265
266struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
267 u64 start, unsigned long len);
268struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len);
269struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
270struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
271 u64 start, unsigned long len);
272void free_extent_buffer(struct extent_buffer *eb);
273void free_extent_buffer_stale(struct extent_buffer *eb);
274#define WAIT_NONE 0
275#define WAIT_COMPLETE 1
276#define WAIT_PAGE_LOCK 2
277int read_extent_buffer_pages(struct extent_io_tree *tree,
278 struct extent_buffer *eb, u64 start, int wait,
279 get_extent_t *get_extent, int mirror_num);
280unsigned long num_extent_pages(u64 start, u64 len);
281struct page *extent_buffer_page(struct extent_buffer *eb, unsigned long i);
282
283static inline void extent_buffer_get(struct extent_buffer *eb)
284{
285 atomic_inc(&eb->refs);
286}
287
288int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
289 unsigned long start,
290 unsigned long len);
291void read_extent_buffer(struct extent_buffer *eb, void *dst,
292 unsigned long start,
293 unsigned long len);
294void write_extent_buffer(struct extent_buffer *eb, const void *src,
295 unsigned long start, unsigned long len);
296void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
297 unsigned long dst_offset, unsigned long src_offset,
298 unsigned long len);
299void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
300 unsigned long src_offset, unsigned long len);
301void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
302 unsigned long src_offset, unsigned long len);
303void memset_extent_buffer(struct extent_buffer *eb, char c,
304 unsigned long start, unsigned long len);
305void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
306void clear_extent_buffer_dirty(struct extent_buffer *eb);
307int set_extent_buffer_dirty(struct extent_buffer *eb);
308int set_extent_buffer_uptodate(struct extent_buffer *eb);
309int clear_extent_buffer_uptodate(struct extent_buffer *eb);
310int extent_buffer_uptodate(struct extent_buffer *eb);
311int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
312 unsigned long min_len, char **map,
313 unsigned long *map_start,
314 unsigned long *map_len);
315int extent_range_uptodate(struct extent_io_tree *tree,
316 u64 start, u64 end);
317int extent_clear_unlock_delalloc(struct inode *inode,
318 struct extent_io_tree *tree,
319 u64 start, u64 end, struct page *locked_page,
320 unsigned long op);
321struct bio *
322btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
323 gfp_t gfp_flags);
324
325struct btrfs_mapping_tree;
326
327int repair_io_failure(struct btrfs_mapping_tree *map_tree, u64 start,
328 u64 length, u64 logical, struct page *page,
329 int mirror_num);
330int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
331int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
332 int mirror_num);
333#endif