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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 <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 extent_state;
31struct btrfs_block_group;
32struct btrfs_fs_info;
33struct btrfs_inode;
34struct btrfs_root;
35struct btrfs_trans_handle;
36struct btrfs_tree_parent_check;
37
38enum {
39 EXTENT_BUFFER_UPTODATE,
40 EXTENT_BUFFER_DIRTY,
41 EXTENT_BUFFER_CORRUPT,
42 /* this got triggered by readahead */
43 EXTENT_BUFFER_READAHEAD,
44 EXTENT_BUFFER_TREE_REF,
45 EXTENT_BUFFER_STALE,
46 EXTENT_BUFFER_WRITEBACK,
47 /* read IO error */
48 EXTENT_BUFFER_READ_ERR,
49 EXTENT_BUFFER_UNMAPPED,
50 EXTENT_BUFFER_IN_TREE,
51 /* write IO error */
52 EXTENT_BUFFER_WRITE_ERR,
53 /* Indicate the extent buffer is written zeroed out (for zoned) */
54 EXTENT_BUFFER_ZONED_ZEROOUT,
55 /* Indicate that extent buffer pages a being read */
56 EXTENT_BUFFER_READING,
57};
58
59/* these are flags for __process_pages_contig */
60enum {
61 ENUM_BIT(PAGE_UNLOCK),
62 /* Page starts writeback, clear dirty bit and set writeback bit */
63 ENUM_BIT(PAGE_START_WRITEBACK),
64 ENUM_BIT(PAGE_END_WRITEBACK),
65 ENUM_BIT(PAGE_SET_ORDERED),
66};
67
68/*
69 * Folio private values. Every page that is controlled by the extent map has
70 * folio private set to this value.
71 */
72#define EXTENT_FOLIO_PRIVATE 1
73
74/*
75 * The extent buffer bitmap operations are done with byte granularity instead of
76 * word granularity for two reasons:
77 * 1. The bitmaps must be little-endian on disk.
78 * 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
79 * single word in a bitmap may straddle two pages in the extent buffer.
80 */
81#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
82#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
83#define BITMAP_FIRST_BYTE_MASK(start) \
84 ((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
85#define BITMAP_LAST_BYTE_MASK(nbits) \
86 (BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
87
88
89int __init extent_buffer_init_cachep(void);
90void __cold extent_buffer_free_cachep(void);
91
92#define INLINE_EXTENT_BUFFER_PAGES (BTRFS_MAX_METADATA_BLOCKSIZE / PAGE_SIZE)
93struct extent_buffer {
94 u64 start;
95 u32 len;
96 u32 folio_size;
97 unsigned long bflags;
98 struct btrfs_fs_info *fs_info;
99
100 /*
101 * The address where the eb can be accessed without any cross-page handling.
102 * This can be NULL if not possible.
103 */
104 void *addr;
105
106 spinlock_t refs_lock;
107 atomic_t refs;
108 int read_mirror;
109 /* >= 0 if eb belongs to a log tree, -1 otherwise */
110 s8 log_index;
111 u8 folio_shift;
112 struct rcu_head rcu_head;
113
114 struct rw_semaphore lock;
115
116 /*
117 * Pointers to all the folios of the extent buffer.
118 *
119 * For now the folio is always order 0 (aka, a single page).
120 */
121 struct folio *folios[INLINE_EXTENT_BUFFER_PAGES];
122#ifdef CONFIG_BTRFS_DEBUG
123 struct list_head leak_list;
124 pid_t lock_owner;
125#endif
126};
127
128struct btrfs_eb_write_context {
129 struct writeback_control *wbc;
130 struct extent_buffer *eb;
131 /* Block group @eb resides in. Only used for zoned mode. */
132 struct btrfs_block_group *zoned_bg;
133};
134
135static inline unsigned long offset_in_eb_folio(const struct extent_buffer *eb,
136 u64 start)
137{
138 ASSERT(eb->folio_size);
139 return start & (eb->folio_size - 1);
140}
141
142/*
143 * Get the correct offset inside the page of extent buffer.
144 *
145 * @eb: target extent buffer
146 * @start: offset inside the extent buffer
147 *
148 * Will handle both sectorsize == PAGE_SIZE and sectorsize < PAGE_SIZE cases.
149 */
150static inline size_t get_eb_offset_in_folio(const struct extent_buffer *eb,
151 unsigned long offset)
152{
153 /*
154 * 1) sectorsize == PAGE_SIZE and nodesize >= PAGE_SIZE case
155 * 1.1) One large folio covering the whole eb
156 * The eb->start is aligned to folio size, thus adding it
157 * won't cause any difference.
158 * 1.2) Several page sized folios
159 * The eb->start is aligned to folio (page) size, thus
160 * adding it won't cause any difference.
161 *
162 * 2) sectorsize < PAGE_SIZE and nodesize < PAGE_SIZE case
163 * In this case there would only be one page sized folio, and there
164 * may be several different extent buffers in the page/folio.
165 * We need to add eb->start to properly access the offset inside
166 * that eb.
167 */
168 return offset_in_folio(eb->folios[0], offset + eb->start);
169}
170
171static inline unsigned long get_eb_folio_index(const struct extent_buffer *eb,
172 unsigned long offset)
173{
174 /*
175 * 1) sectorsize == PAGE_SIZE and nodesize >= PAGE_SIZE case
176 * 1.1) One large folio covering the whole eb.
177 * the folio_shift would be large enough to always make us
178 * return 0 as index.
179 * 1.2) Several page sized folios
180 * The folio_shift would be PAGE_SHIFT, giving us the correct
181 * index.
182 *
183 * 2) sectorsize < PAGE_SIZE and nodesize < PAGE_SIZE case
184 * The folio would only be page sized, and always give us 0 as index.
185 */
186 return offset >> eb->folio_shift;
187}
188
189/*
190 * Structure to record how many bytes and which ranges are set/cleared
191 */
192struct extent_changeset {
193 /* How many bytes are set/cleared in this operation */
194 u64 bytes_changed;
195
196 /* Changed ranges */
197 struct ulist range_changed;
198};
199
200static inline void extent_changeset_init(struct extent_changeset *changeset)
201{
202 changeset->bytes_changed = 0;
203 ulist_init(&changeset->range_changed);
204}
205
206static inline struct extent_changeset *extent_changeset_alloc(void)
207{
208 struct extent_changeset *ret;
209
210 ret = kmalloc(sizeof(*ret), GFP_KERNEL);
211 if (!ret)
212 return NULL;
213
214 extent_changeset_init(ret);
215 return ret;
216}
217
218static inline void extent_changeset_prealloc(struct extent_changeset *changeset, gfp_t gfp_mask)
219{
220 ulist_prealloc(&changeset->range_changed, gfp_mask);
221}
222
223static inline void extent_changeset_release(struct extent_changeset *changeset)
224{
225 if (!changeset)
226 return;
227 changeset->bytes_changed = 0;
228 ulist_release(&changeset->range_changed);
229}
230
231static inline void extent_changeset_free(struct extent_changeset *changeset)
232{
233 if (!changeset)
234 return;
235 extent_changeset_release(changeset);
236 kfree(changeset);
237}
238
239bool try_release_extent_mapping(struct folio *folio, gfp_t mask);
240int try_release_extent_buffer(struct folio *folio);
241
242int btrfs_read_folio(struct file *file, struct folio *folio);
243void extent_write_locked_range(struct inode *inode, const struct folio *locked_folio,
244 u64 start, u64 end, struct writeback_control *wbc,
245 bool pages_dirty);
246int btrfs_writepages(struct address_space *mapping, struct writeback_control *wbc);
247int btree_write_cache_pages(struct address_space *mapping,
248 struct writeback_control *wbc);
249void btrfs_readahead(struct readahead_control *rac);
250int set_folio_extent_mapped(struct folio *folio);
251int set_page_extent_mapped(struct page *page);
252void clear_folio_extent_mapped(struct folio *folio);
253
254struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
255 u64 start, u64 owner_root, int level);
256struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
257 u64 start, unsigned long len);
258struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
259 u64 start);
260struct extent_buffer *btrfs_clone_extent_buffer(const struct extent_buffer *src);
261struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
262 u64 start);
263void free_extent_buffer(struct extent_buffer *eb);
264void free_extent_buffer_stale(struct extent_buffer *eb);
265#define WAIT_NONE 0
266#define WAIT_COMPLETE 1
267#define WAIT_PAGE_LOCK 2
268int read_extent_buffer_pages(struct extent_buffer *eb, int wait, int mirror_num,
269 const struct btrfs_tree_parent_check *parent_check);
270void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
271void btrfs_readahead_tree_block(struct btrfs_fs_info *fs_info,
272 u64 bytenr, u64 owner_root, u64 gen, int level);
273void btrfs_readahead_node_child(struct extent_buffer *node, int slot);
274
275static inline int num_extent_pages(const struct extent_buffer *eb)
276{
277 /*
278 * For sectorsize == PAGE_SIZE case, since nodesize is always aligned to
279 * sectorsize, it's just eb->len >> PAGE_SHIFT.
280 *
281 * For sectorsize < PAGE_SIZE case, we could have nodesize < PAGE_SIZE,
282 * thus have to ensure we get at least one page.
283 */
284 return (eb->len >> PAGE_SHIFT) ?: 1;
285}
286
287/*
288 * This can only be determined at runtime by checking eb::folios[0].
289 *
290 * As we can have either one large folio covering the whole eb
291 * (either nodesize <= PAGE_SIZE, or high order folio), or multiple
292 * single-paged folios.
293 */
294static inline int num_extent_folios(const struct extent_buffer *eb)
295{
296 if (folio_order(eb->folios[0]))
297 return 1;
298 return num_extent_pages(eb);
299}
300
301static inline int extent_buffer_uptodate(const struct extent_buffer *eb)
302{
303 return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
304}
305
306int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
307 unsigned long start, unsigned long len);
308void read_extent_buffer(const struct extent_buffer *eb, void *dst,
309 unsigned long start,
310 unsigned long len);
311int read_extent_buffer_to_user_nofault(const struct extent_buffer *eb,
312 void __user *dst, unsigned long start,
313 unsigned long len);
314void write_extent_buffer(const struct extent_buffer *eb, const void *src,
315 unsigned long start, unsigned long len);
316
317static inline void write_extent_buffer_chunk_tree_uuid(
318 const struct extent_buffer *eb, const void *chunk_tree_uuid)
319{
320 write_extent_buffer(eb, chunk_tree_uuid,
321 offsetof(struct btrfs_header, chunk_tree_uuid),
322 BTRFS_FSID_SIZE);
323}
324
325static inline void write_extent_buffer_fsid(const struct extent_buffer *eb,
326 const void *fsid)
327{
328 write_extent_buffer(eb, fsid, offsetof(struct btrfs_header, fsid),
329 BTRFS_FSID_SIZE);
330}
331
332void copy_extent_buffer_full(const struct extent_buffer *dst,
333 const struct extent_buffer *src);
334void copy_extent_buffer(const struct extent_buffer *dst,
335 const struct extent_buffer *src,
336 unsigned long dst_offset, unsigned long src_offset,
337 unsigned long len);
338void memcpy_extent_buffer(const struct extent_buffer *dst,
339 unsigned long dst_offset, unsigned long src_offset,
340 unsigned long len);
341void memmove_extent_buffer(const struct extent_buffer *dst,
342 unsigned long dst_offset, unsigned long src_offset,
343 unsigned long len);
344void memzero_extent_buffer(const struct extent_buffer *eb, unsigned long start,
345 unsigned long len);
346int extent_buffer_test_bit(const struct extent_buffer *eb, unsigned long start,
347 unsigned long pos);
348void extent_buffer_bitmap_set(const struct extent_buffer *eb, unsigned long start,
349 unsigned long pos, unsigned long len);
350void extent_buffer_bitmap_clear(const struct extent_buffer *eb,
351 unsigned long start, unsigned long pos,
352 unsigned long len);
353void set_extent_buffer_dirty(struct extent_buffer *eb);
354void set_extent_buffer_uptodate(struct extent_buffer *eb);
355void clear_extent_buffer_uptodate(struct extent_buffer *eb);
356void extent_clear_unlock_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
357 const struct folio *locked_folio,
358 struct extent_state **cached,
359 u32 bits_to_clear, unsigned long page_ops);
360int extent_invalidate_folio(struct extent_io_tree *tree,
361 struct folio *folio, size_t offset);
362void btrfs_clear_buffer_dirty(struct btrfs_trans_handle *trans,
363 struct extent_buffer *buf);
364
365int btrfs_alloc_page_array(unsigned int nr_pages, struct page **page_array,
366 bool nofail);
367int btrfs_alloc_folio_array(unsigned int nr_folios, struct folio **folio_array);
368
369#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
370bool find_lock_delalloc_range(struct inode *inode,
371 struct folio *locked_folio, u64 *start,
372 u64 *end);
373#endif
374struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
375 u64 start);
376
377#ifdef CONFIG_BTRFS_DEBUG
378void btrfs_extent_buffer_leak_debug_check(struct btrfs_fs_info *fs_info);
379#else
380#define btrfs_extent_buffer_leak_debug_check(fs_info) do {} while (0)
381#endif
382
383#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_NORESERVE (1 << 15)
23#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
24#define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
25
26/*
27 * flags for bio submission. The high bits indicate the compression
28 * type for this bio
29 */
30#define EXTENT_BIO_COMPRESSED 1
31#define EXTENT_BIO_TREE_LOG 2
32#define EXTENT_BIO_PARENT_LOCKED 4
33#define EXTENT_BIO_FLAG_SHIFT 16
34
35/* these are bit numbers for test/set bit */
36#define EXTENT_BUFFER_UPTODATE 0
37#define EXTENT_BUFFER_BLOCKING 1
38#define EXTENT_BUFFER_DIRTY 2
39#define EXTENT_BUFFER_CORRUPT 3
40#define EXTENT_BUFFER_READAHEAD 4 /* this got triggered by readahead */
41#define EXTENT_BUFFER_TREE_REF 5
42#define EXTENT_BUFFER_STALE 6
43#define EXTENT_BUFFER_WRITEBACK 7
44#define EXTENT_BUFFER_IOERR 8
45#define EXTENT_BUFFER_DUMMY 9
46#define EXTENT_BUFFER_IN_TREE 10
47
48/* these are flags for extent_clear_unlock_delalloc */
49#define PAGE_UNLOCK (1 << 0)
50#define PAGE_CLEAR_DIRTY (1 << 1)
51#define PAGE_SET_WRITEBACK (1 << 2)
52#define PAGE_END_WRITEBACK (1 << 3)
53#define PAGE_SET_PRIVATE2 (1 << 4)
54
55/*
56 * page->private values. Every page that is controlled by the extent
57 * map has page->private set to one.
58 */
59#define EXTENT_PAGE_PRIVATE 1
60#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
61
62struct extent_state;
63struct btrfs_root;
64struct btrfs_io_bio;
65
66typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
67 struct bio *bio, int mirror_num,
68 unsigned long bio_flags, u64 bio_offset);
69struct extent_io_ops {
70 int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
71 u64 start, u64 end, int *page_started,
72 unsigned long *nr_written);
73 int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
74 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
75 extent_submit_bio_hook_t *submit_bio_hook;
76 int (*merge_bio_hook)(int rw, struct page *page, unsigned long offset,
77 size_t size, struct bio *bio,
78 unsigned long bio_flags);
79 int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
80 int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset,
81 struct page *page, u64 start, u64 end,
82 int mirror);
83 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
84 struct extent_state *state, int uptodate);
85 void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
86 unsigned long *bits);
87 void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
88 unsigned long *bits);
89 void (*merge_extent_hook)(struct inode *inode,
90 struct extent_state *new,
91 struct extent_state *other);
92 void (*split_extent_hook)(struct inode *inode,
93 struct extent_state *orig, u64 split);
94};
95
96struct extent_io_tree {
97 struct rb_root state;
98 struct address_space *mapping;
99 u64 dirty_bytes;
100 int track_uptodate;
101 spinlock_t lock;
102 struct extent_io_ops *ops;
103};
104
105struct extent_state {
106 u64 start;
107 u64 end; /* inclusive */
108 struct rb_node rb_node;
109
110 /* ADD NEW ELEMENTS AFTER THIS */
111 struct extent_io_tree *tree;
112 wait_queue_head_t wq;
113 atomic_t refs;
114 unsigned long state;
115
116 /* for use by the FS */
117 u64 private;
118
119#ifdef CONFIG_BTRFS_DEBUG
120 struct list_head leak_list;
121#endif
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 btrfs_fs_info *fs_info;
133 spinlock_t refs_lock;
134 atomic_t refs;
135 atomic_t io_pages;
136 int read_mirror;
137 struct rcu_head rcu_head;
138 pid_t lock_owner;
139
140 /* count of read lock holders on the extent buffer */
141 atomic_t write_locks;
142 atomic_t read_locks;
143 atomic_t blocking_writers;
144 atomic_t blocking_readers;
145 atomic_t spinning_readers;
146 atomic_t spinning_writers;
147 int lock_nested;
148
149 /* protects write locks */
150 rwlock_t lock;
151
152 /* readers use lock_wq while they wait for the write
153 * lock holders to unlock
154 */
155 wait_queue_head_t write_lock_wq;
156
157 /* writers use read_lock_wq while they wait for readers
158 * to unlock
159 */
160 wait_queue_head_t read_lock_wq;
161 wait_queue_head_t lock_wq;
162 struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
163#ifdef CONFIG_BTRFS_DEBUG
164 struct list_head leak_list;
165#endif
166};
167
168static inline void extent_set_compress_type(unsigned long *bio_flags,
169 int compress_type)
170{
171 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
172}
173
174static inline int extent_compress_type(unsigned long bio_flags)
175{
176 return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
177}
178
179struct extent_map_tree;
180
181typedef struct extent_map *(get_extent_t)(struct inode *inode,
182 struct page *page,
183 size_t pg_offset,
184 u64 start, u64 len,
185 int create);
186
187void extent_io_tree_init(struct extent_io_tree *tree,
188 struct address_space *mapping);
189int try_release_extent_mapping(struct extent_map_tree *map,
190 struct extent_io_tree *tree, struct page *page,
191 gfp_t mask);
192int try_release_extent_buffer(struct page *page);
193int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
194int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
195 unsigned long bits, struct extent_state **cached);
196int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
197int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
198 struct extent_state **cached, gfp_t mask);
199int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
200int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
201 get_extent_t *get_extent, int mirror_num);
202int extent_read_full_page_nolock(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 unsigned long bits, int filled,
214 struct extent_state *cached_state);
215int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
216 unsigned long bits, gfp_t mask);
217int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
218 unsigned long bits, int wake, int delete,
219 struct extent_state **cached, gfp_t mask);
220int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
221 unsigned long bits, gfp_t mask);
222int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
223 unsigned long bits, u64 *failed_start,
224 struct extent_state **cached_state, gfp_t mask);
225int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
226 struct extent_state **cached_state, gfp_t mask);
227int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
228 struct extent_state **cached_state, gfp_t mask);
229int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
230 gfp_t mask);
231int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
232 gfp_t mask);
233int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
234 gfp_t mask);
235int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
236 unsigned long bits, unsigned long clear_bits,
237 struct extent_state **cached_state, gfp_t mask);
238int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
239 struct extent_state **cached_state, gfp_t mask);
240int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end,
241 struct extent_state **cached_state, gfp_t mask);
242int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
243 u64 *start_ret, u64 *end_ret, unsigned long bits,
244 struct extent_state **cached_state);
245int extent_invalidatepage(struct extent_io_tree *tree,
246 struct page *page, unsigned long offset);
247int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
248 get_extent_t *get_extent,
249 struct writeback_control *wbc);
250int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
251 u64 start, u64 end, get_extent_t *get_extent,
252 int mode);
253int extent_writepages(struct extent_io_tree *tree,
254 struct address_space *mapping,
255 get_extent_t *get_extent,
256 struct writeback_control *wbc);
257int btree_write_cache_pages(struct address_space *mapping,
258 struct writeback_control *wbc);
259int extent_readpages(struct extent_io_tree *tree,
260 struct address_space *mapping,
261 struct list_head *pages, unsigned nr_pages,
262 get_extent_t get_extent);
263int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
264 __u64 start, __u64 len, get_extent_t *get_extent);
265int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
266void set_page_extent_mapped(struct page *page);
267
268struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
269 u64 start, unsigned long len);
270struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len);
271struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
272struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
273 u64 start);
274void free_extent_buffer(struct extent_buffer *eb);
275void free_extent_buffer_stale(struct extent_buffer *eb);
276#define WAIT_NONE 0
277#define WAIT_COMPLETE 1
278#define WAIT_PAGE_LOCK 2
279int read_extent_buffer_pages(struct extent_io_tree *tree,
280 struct extent_buffer *eb, u64 start, int wait,
281 get_extent_t *get_extent, int mirror_num);
282void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
283
284static inline unsigned long num_extent_pages(u64 start, u64 len)
285{
286 return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
287 (start >> PAGE_CACHE_SHIFT);
288}
289
290static inline struct page *extent_buffer_page(struct extent_buffer *eb,
291 unsigned long i)
292{
293 return eb->pages[i];
294}
295
296static inline void extent_buffer_get(struct extent_buffer *eb)
297{
298 atomic_inc(&eb->refs);
299}
300
301int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
302 unsigned long start,
303 unsigned long len);
304void read_extent_buffer(struct extent_buffer *eb, void *dst,
305 unsigned long start,
306 unsigned long len);
307void write_extent_buffer(struct extent_buffer *eb, const void *src,
308 unsigned long start, unsigned long len);
309void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
310 unsigned long dst_offset, unsigned long src_offset,
311 unsigned long len);
312void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
313 unsigned long src_offset, unsigned long len);
314void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
315 unsigned long src_offset, unsigned long len);
316void memset_extent_buffer(struct extent_buffer *eb, char c,
317 unsigned long start, unsigned long len);
318void clear_extent_buffer_dirty(struct extent_buffer *eb);
319int set_extent_buffer_dirty(struct extent_buffer *eb);
320int set_extent_buffer_uptodate(struct extent_buffer *eb);
321int clear_extent_buffer_uptodate(struct extent_buffer *eb);
322int extent_buffer_uptodate(struct extent_buffer *eb);
323int extent_buffer_under_io(struct extent_buffer *eb);
324int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
325 unsigned long min_len, char **map,
326 unsigned long *map_start,
327 unsigned long *map_len);
328int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
329int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
330int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
331 struct page *locked_page,
332 unsigned long bits_to_clear,
333 unsigned long page_ops);
334struct bio *
335btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
336 gfp_t gfp_flags);
337struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
338struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask);
339
340struct btrfs_fs_info;
341
342int repair_io_failure(struct btrfs_fs_info *fs_info, u64 start,
343 u64 length, u64 logical, struct page *page,
344 int mirror_num);
345int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
346int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
347 int mirror_num);
348#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
349noinline u64 find_lock_delalloc_range(struct inode *inode,
350 struct extent_io_tree *tree,
351 struct page *locked_page, u64 *start,
352 u64 *end, u64 max_bytes);
353#endif
354#endif