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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_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
21#define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
22
23/*
24 * flags for bio submission. The high bits indicate the compression
25 * type for this bio
26 */
27#define EXTENT_BIO_COMPRESSED 1
28#define EXTENT_BIO_FLAG_SHIFT 16
29
30/* these are bit numbers for test/set bit */
31#define EXTENT_BUFFER_UPTODATE 0
32#define EXTENT_BUFFER_BLOCKING 1
33#define EXTENT_BUFFER_DIRTY 2
34#define EXTENT_BUFFER_CORRUPT 3
35
36/* these are flags for extent_clear_unlock_delalloc */
37#define EXTENT_CLEAR_UNLOCK_PAGE 0x1
38#define EXTENT_CLEAR_UNLOCK 0x2
39#define EXTENT_CLEAR_DELALLOC 0x4
40#define EXTENT_CLEAR_DIRTY 0x8
41#define EXTENT_SET_WRITEBACK 0x10
42#define EXTENT_END_WRITEBACK 0x20
43#define EXTENT_SET_PRIVATE2 0x40
44#define EXTENT_CLEAR_ACCOUNTING 0x80
45
46/*
47 * page->private values. Every page that is controlled by the extent
48 * map has page->private set to one.
49 */
50#define EXTENT_PAGE_PRIVATE 1
51#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
52
53struct extent_state;
54
55typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
56 struct bio *bio, int mirror_num,
57 unsigned long bio_flags, u64 bio_offset);
58struct extent_io_ops {
59 int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
60 u64 start, u64 end, int *page_started,
61 unsigned long *nr_written);
62 int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
63 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
64 extent_submit_bio_hook_t *submit_bio_hook;
65 int (*merge_bio_hook)(struct page *page, unsigned long offset,
66 size_t size, struct bio *bio,
67 unsigned long bio_flags);
68 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
69 int (*readpage_io_failed_hook)(struct bio *bio, struct page *page,
70 u64 start, u64 end,
71 struct extent_state *state);
72 int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
73 u64 start, u64 end,
74 struct extent_state *state);
75 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
76 struct extent_state *state);
77 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
78 struct extent_state *state, int uptodate);
79 void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
80 int *bits);
81 void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
82 int *bits);
83 void (*merge_extent_hook)(struct inode *inode,
84 struct extent_state *new,
85 struct extent_state *other);
86 void (*split_extent_hook)(struct inode *inode,
87 struct extent_state *orig, u64 split);
88 int (*write_cache_pages_lock_hook)(struct page *page);
89};
90
91struct extent_io_tree {
92 struct rb_root state;
93 struct radix_tree_root buffer;
94 struct address_space *mapping;
95 u64 dirty_bytes;
96 spinlock_t lock;
97 spinlock_t buffer_lock;
98 struct extent_io_ops *ops;
99};
100
101struct extent_state {
102 u64 start;
103 u64 end; /* inclusive */
104 struct rb_node rb_node;
105
106 /* ADD NEW ELEMENTS AFTER THIS */
107 struct extent_io_tree *tree;
108 wait_queue_head_t wq;
109 atomic_t refs;
110 unsigned long state;
111
112 /* for use by the FS */
113 u64 private;
114
115 struct list_head leak_list;
116};
117
118struct extent_buffer {
119 u64 start;
120 unsigned long len;
121 unsigned long map_start;
122 unsigned long map_len;
123 struct page *first_page;
124 unsigned long bflags;
125 struct list_head leak_list;
126 struct rcu_head rcu_head;
127 atomic_t refs;
128
129 /* count of read lock holders on the extent buffer */
130 atomic_t write_locks;
131 atomic_t read_locks;
132 atomic_t blocking_writers;
133 atomic_t blocking_readers;
134 atomic_t spinning_readers;
135 atomic_t spinning_writers;
136
137 /* protects write locks */
138 rwlock_t lock;
139
140 /* readers use lock_wq while they wait for the write
141 * lock holders to unlock
142 */
143 wait_queue_head_t write_lock_wq;
144
145 /* writers use read_lock_wq while they wait for readers
146 * to unlock
147 */
148 wait_queue_head_t read_lock_wq;
149};
150
151static inline void extent_set_compress_type(unsigned long *bio_flags,
152 int compress_type)
153{
154 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
155}
156
157static inline int extent_compress_type(unsigned long bio_flags)
158{
159 return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
160}
161
162struct extent_map_tree;
163
164typedef struct extent_map *(get_extent_t)(struct inode *inode,
165 struct page *page,
166 size_t pg_offset,
167 u64 start, u64 len,
168 int create);
169
170void extent_io_tree_init(struct extent_io_tree *tree,
171 struct address_space *mapping);
172int try_release_extent_mapping(struct extent_map_tree *map,
173 struct extent_io_tree *tree, struct page *page,
174 gfp_t mask);
175int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
176int try_release_extent_state(struct extent_map_tree *map,
177 struct extent_io_tree *tree, struct page *page,
178 gfp_t mask);
179int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
180int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
181 int bits, struct extent_state **cached, gfp_t mask);
182int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
183int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
184 struct extent_state **cached, gfp_t mask);
185int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
186 gfp_t mask);
187int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
188 get_extent_t *get_extent);
189int __init extent_io_init(void);
190void extent_io_exit(void);
191
192u64 count_range_bits(struct extent_io_tree *tree,
193 u64 *start, u64 search_end,
194 u64 max_bytes, unsigned long bits, int contig);
195
196void free_extent_state(struct extent_state *state);
197int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
198 int bits, int filled, struct extent_state *cached_state);
199int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
200 int bits, gfp_t mask);
201int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
202 int bits, int wake, int delete, struct extent_state **cached,
203 gfp_t mask);
204int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
205 int bits, gfp_t mask);
206int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
207 int bits, int exclusive_bits, u64 *failed_start,
208 struct extent_state **cached_state, gfp_t mask);
209int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
210 struct extent_state **cached_state, gfp_t mask);
211int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
212 gfp_t mask);
213int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
214 gfp_t mask);
215int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
216 gfp_t mask);
217int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
218 struct extent_state **cached_state, gfp_t mask);
219int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
220 u64 *start_ret, u64 *end_ret, int bits);
221struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
222 u64 start, int bits);
223int extent_invalidatepage(struct extent_io_tree *tree,
224 struct page *page, unsigned long offset);
225int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
226 get_extent_t *get_extent,
227 struct writeback_control *wbc);
228int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
229 u64 start, u64 end, get_extent_t *get_extent,
230 int mode);
231int extent_writepages(struct extent_io_tree *tree,
232 struct address_space *mapping,
233 get_extent_t *get_extent,
234 struct writeback_control *wbc);
235int extent_readpages(struct extent_io_tree *tree,
236 struct address_space *mapping,
237 struct list_head *pages, unsigned nr_pages,
238 get_extent_t get_extent);
239int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
240 __u64 start, __u64 len, get_extent_t *get_extent);
241int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
242int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
243void set_page_extent_mapped(struct page *page);
244
245struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
246 u64 start, unsigned long len,
247 struct page *page0);
248struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
249 u64 start, unsigned long len);
250void free_extent_buffer(struct extent_buffer *eb);
251int read_extent_buffer_pages(struct extent_io_tree *tree,
252 struct extent_buffer *eb, u64 start, int wait,
253 get_extent_t *get_extent, int mirror_num);
254
255static inline void extent_buffer_get(struct extent_buffer *eb)
256{
257 atomic_inc(&eb->refs);
258}
259
260int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
261 unsigned long start,
262 unsigned long len);
263void read_extent_buffer(struct extent_buffer *eb, void *dst,
264 unsigned long start,
265 unsigned long len);
266void write_extent_buffer(struct extent_buffer *eb, const void *src,
267 unsigned long start, unsigned long len);
268void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
269 unsigned long dst_offset, unsigned long src_offset,
270 unsigned long len);
271void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
272 unsigned long src_offset, unsigned long len);
273void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
274 unsigned long src_offset, unsigned long len);
275void memset_extent_buffer(struct extent_buffer *eb, char c,
276 unsigned long start, unsigned long len);
277int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
278int clear_extent_buffer_dirty(struct extent_io_tree *tree,
279 struct extent_buffer *eb);
280int set_extent_buffer_dirty(struct extent_io_tree *tree,
281 struct extent_buffer *eb);
282int set_extent_buffer_uptodate(struct extent_io_tree *tree,
283 struct extent_buffer *eb);
284int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
285 struct extent_buffer *eb,
286 struct extent_state **cached_state);
287int extent_buffer_uptodate(struct extent_io_tree *tree,
288 struct extent_buffer *eb,
289 struct extent_state *cached_state);
290int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
291 unsigned long min_len, char **map,
292 unsigned long *map_start,
293 unsigned long *map_len);
294int extent_range_uptodate(struct extent_io_tree *tree,
295 u64 start, u64 end);
296int extent_clear_unlock_delalloc(struct inode *inode,
297 struct extent_io_tree *tree,
298 u64 start, u64 end, struct page *locked_page,
299 unsigned long op);
300struct bio *
301btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
302 gfp_t gfp_flags);
303#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 "ulist.h"
9
10/* bits for the extent state */
11#define EXTENT_DIRTY (1U << 0)
12#define EXTENT_WRITEBACK (1U << 1)
13#define EXTENT_UPTODATE (1U << 2)
14#define EXTENT_LOCKED (1U << 3)
15#define EXTENT_NEW (1U << 4)
16#define EXTENT_DELALLOC (1U << 5)
17#define EXTENT_DEFRAG (1U << 6)
18#define EXTENT_BOUNDARY (1U << 9)
19#define EXTENT_NODATASUM (1U << 10)
20#define EXTENT_CLEAR_META_RESV (1U << 11)
21#define EXTENT_FIRST_DELALLOC (1U << 12)
22#define EXTENT_NEED_WAIT (1U << 13)
23#define EXTENT_DAMAGED (1U << 14)
24#define EXTENT_NORESERVE (1U << 15)
25#define EXTENT_QGROUP_RESERVED (1U << 16)
26#define EXTENT_CLEAR_DATA_RESV (1U << 17)
27#define EXTENT_DELALLOC_NEW (1U << 18)
28#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
29#define EXTENT_DO_ACCOUNTING (EXTENT_CLEAR_META_RESV | \
30 EXTENT_CLEAR_DATA_RESV)
31#define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
32
33/*
34 * flags for bio submission. The high bits indicate the compression
35 * type for this bio
36 */
37#define EXTENT_BIO_COMPRESSED 1
38#define EXTENT_BIO_FLAG_SHIFT 16
39
40/* these are bit numbers for test/set bit */
41#define EXTENT_BUFFER_UPTODATE 0
42#define EXTENT_BUFFER_DIRTY 2
43#define EXTENT_BUFFER_CORRUPT 3
44#define EXTENT_BUFFER_READAHEAD 4 /* this got triggered by readahead */
45#define EXTENT_BUFFER_TREE_REF 5
46#define EXTENT_BUFFER_STALE 6
47#define EXTENT_BUFFER_WRITEBACK 7
48#define EXTENT_BUFFER_READ_ERR 8 /* read IO error */
49#define EXTENT_BUFFER_DUMMY 9
50#define EXTENT_BUFFER_IN_TREE 10
51#define EXTENT_BUFFER_WRITE_ERR 11 /* write IO error */
52
53/* these are flags for __process_pages_contig */
54#define PAGE_UNLOCK (1 << 0)
55#define PAGE_CLEAR_DIRTY (1 << 1)
56#define PAGE_SET_WRITEBACK (1 << 2)
57#define PAGE_END_WRITEBACK (1 << 3)
58#define PAGE_SET_PRIVATE2 (1 << 4)
59#define PAGE_SET_ERROR (1 << 5)
60#define PAGE_LOCK (1 << 6)
61
62/*
63 * page->private values. Every page that is controlled by the extent
64 * map has page->private set to one.
65 */
66#define EXTENT_PAGE_PRIVATE 1
67
68/*
69 * The extent buffer bitmap operations are done with byte granularity instead of
70 * word granularity for two reasons:
71 * 1. The bitmaps must be little-endian on disk.
72 * 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
73 * single word in a bitmap may straddle two pages in the extent buffer.
74 */
75#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
76#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
77#define BITMAP_FIRST_BYTE_MASK(start) \
78 ((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
79#define BITMAP_LAST_BYTE_MASK(nbits) \
80 (BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
81
82static inline int le_test_bit(int nr, const u8 *addr)
83{
84 return 1U & (addr[BIT_BYTE(nr)] >> (nr & (BITS_PER_BYTE-1)));
85}
86
87void le_bitmap_set(u8 *map, unsigned int start, int len);
88void le_bitmap_clear(u8 *map, unsigned int start, int len);
89
90struct extent_state;
91struct btrfs_root;
92struct btrfs_inode;
93struct btrfs_io_bio;
94struct io_failure_record;
95
96typedef blk_status_t (extent_submit_bio_hook_t)(void *private_data, struct bio *bio,
97 int mirror_num, unsigned long bio_flags,
98 u64 bio_offset);
99
100typedef blk_status_t (extent_submit_bio_start_t)(void *private_data,
101 struct bio *bio, u64 bio_offset);
102
103typedef blk_status_t (extent_submit_bio_done_t)(void *private_data,
104 struct bio *bio, int mirror_num);
105
106struct extent_io_ops {
107 /*
108 * The following callbacks must be allways defined, the function
109 * pointer will be called unconditionally.
110 */
111 extent_submit_bio_hook_t *submit_bio_hook;
112 int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset,
113 struct page *page, u64 start, u64 end,
114 int mirror);
115 int (*merge_bio_hook)(struct page *page, unsigned long offset,
116 size_t size, struct bio *bio,
117 unsigned long bio_flags);
118 int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
119 struct btrfs_fs_info *(*tree_fs_info)(void *private_data);
120 void (*set_range_writeback)(void *private_data, u64 start, u64 end);
121
122 /*
123 * Optional hooks, called if the pointer is not NULL
124 */
125 int (*fill_delalloc)(void *private_data, struct page *locked_page,
126 u64 start, u64 end, int *page_started,
127 unsigned long *nr_written,
128 struct writeback_control *wbc);
129
130 int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
131 void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
132 struct extent_state *state, int uptodate);
133 void (*set_bit_hook)(void *private_data, struct extent_state *state,
134 unsigned *bits);
135 void (*clear_bit_hook)(void *private_data,
136 struct extent_state *state,
137 unsigned *bits);
138 void (*merge_extent_hook)(void *private_data,
139 struct extent_state *new,
140 struct extent_state *other);
141 void (*split_extent_hook)(void *private_data,
142 struct extent_state *orig, u64 split);
143 void (*check_extent_io_range)(void *private_data, const char *caller,
144 u64 start, u64 end);
145};
146
147struct extent_io_tree {
148 struct rb_root state;
149 void *private_data;
150 u64 dirty_bytes;
151 int track_uptodate;
152 spinlock_t lock;
153 const struct extent_io_ops *ops;
154};
155
156struct extent_state {
157 u64 start;
158 u64 end; /* inclusive */
159 struct rb_node rb_node;
160
161 /* ADD NEW ELEMENTS AFTER THIS */
162 wait_queue_head_t wq;
163 refcount_t refs;
164 unsigned state;
165
166 struct io_failure_record *failrec;
167
168#ifdef CONFIG_BTRFS_DEBUG
169 struct list_head leak_list;
170#endif
171};
172
173#define INLINE_EXTENT_BUFFER_PAGES 16
174#define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_SIZE)
175struct extent_buffer {
176 u64 start;
177 unsigned long len;
178 unsigned long bflags;
179 struct btrfs_fs_info *fs_info;
180 spinlock_t refs_lock;
181 atomic_t refs;
182 atomic_t io_pages;
183 int read_mirror;
184 struct rcu_head rcu_head;
185 pid_t lock_owner;
186
187 /* count of read lock holders on the extent buffer */
188 atomic_t write_locks;
189 atomic_t read_locks;
190 atomic_t blocking_writers;
191 atomic_t blocking_readers;
192 atomic_t spinning_readers;
193 atomic_t spinning_writers;
194 short lock_nested;
195 /* >= 0 if eb belongs to a log tree, -1 otherwise */
196 short log_index;
197
198 /* protects write locks */
199 rwlock_t lock;
200
201 /* readers use lock_wq while they wait for the write
202 * lock holders to unlock
203 */
204 wait_queue_head_t write_lock_wq;
205
206 /* writers use read_lock_wq while they wait for readers
207 * to unlock
208 */
209 wait_queue_head_t read_lock_wq;
210 struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
211#ifdef CONFIG_BTRFS_DEBUG
212 struct list_head leak_list;
213#endif
214};
215
216/*
217 * Structure to record how many bytes and which ranges are set/cleared
218 */
219struct extent_changeset {
220 /* How many bytes are set/cleared in this operation */
221 unsigned int bytes_changed;
222
223 /* Changed ranges */
224 struct ulist range_changed;
225};
226
227static inline void extent_changeset_init(struct extent_changeset *changeset)
228{
229 changeset->bytes_changed = 0;
230 ulist_init(&changeset->range_changed);
231}
232
233static inline struct extent_changeset *extent_changeset_alloc(void)
234{
235 struct extent_changeset *ret;
236
237 ret = kmalloc(sizeof(*ret), GFP_KERNEL);
238 if (!ret)
239 return NULL;
240
241 extent_changeset_init(ret);
242 return ret;
243}
244
245static inline void extent_changeset_release(struct extent_changeset *changeset)
246{
247 if (!changeset)
248 return;
249 changeset->bytes_changed = 0;
250 ulist_release(&changeset->range_changed);
251}
252
253static inline void extent_changeset_free(struct extent_changeset *changeset)
254{
255 if (!changeset)
256 return;
257 extent_changeset_release(changeset);
258 kfree(changeset);
259}
260
261static inline void extent_set_compress_type(unsigned long *bio_flags,
262 int compress_type)
263{
264 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
265}
266
267static inline int extent_compress_type(unsigned long bio_flags)
268{
269 return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
270}
271
272struct extent_map_tree;
273
274typedef struct extent_map *(get_extent_t)(struct btrfs_inode *inode,
275 struct page *page,
276 size_t pg_offset,
277 u64 start, u64 len,
278 int create);
279
280void extent_io_tree_init(struct extent_io_tree *tree, void *private_data);
281int try_release_extent_mapping(struct extent_map_tree *map,
282 struct extent_io_tree *tree, struct page *page,
283 gfp_t mask);
284int try_release_extent_buffer(struct page *page);
285int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
286 struct extent_state **cached);
287
288static inline int lock_extent(struct extent_io_tree *tree, u64 start, u64 end)
289{
290 return lock_extent_bits(tree, start, end, NULL);
291}
292
293int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
294int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
295 get_extent_t *get_extent, int mirror_num);
296int __init extent_io_init(void);
297void __cold extent_io_exit(void);
298
299u64 count_range_bits(struct extent_io_tree *tree,
300 u64 *start, u64 search_end,
301 u64 max_bytes, unsigned bits, int contig);
302
303void free_extent_state(struct extent_state *state);
304int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
305 unsigned bits, int filled,
306 struct extent_state *cached_state);
307int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
308 unsigned bits, struct extent_changeset *changeset);
309int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
310 unsigned bits, int wake, int delete,
311 struct extent_state **cached);
312int __clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
313 unsigned bits, int wake, int delete,
314 struct extent_state **cached, gfp_t mask,
315 struct extent_changeset *changeset);
316
317static inline int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end)
318{
319 return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL);
320}
321
322static inline int unlock_extent_cached(struct extent_io_tree *tree, u64 start,
323 u64 end, struct extent_state **cached)
324{
325 return __clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached,
326 GFP_NOFS, NULL);
327}
328
329static inline int unlock_extent_cached_atomic(struct extent_io_tree *tree,
330 u64 start, u64 end, struct extent_state **cached)
331{
332 return __clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached,
333 GFP_ATOMIC, NULL);
334}
335
336static inline int clear_extent_bits(struct extent_io_tree *tree, u64 start,
337 u64 end, unsigned bits)
338{
339 int wake = 0;
340
341 if (bits & EXTENT_LOCKED)
342 wake = 1;
343
344 return clear_extent_bit(tree, start, end, bits, wake, 0, NULL);
345}
346
347int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
348 unsigned bits, struct extent_changeset *changeset);
349int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
350 unsigned bits, u64 *failed_start,
351 struct extent_state **cached_state, gfp_t mask);
352
353static inline int set_extent_bits(struct extent_io_tree *tree, u64 start,
354 u64 end, unsigned bits)
355{
356 return set_extent_bit(tree, start, end, bits, NULL, NULL, GFP_NOFS);
357}
358
359static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
360 u64 end, struct extent_state **cached_state)
361{
362 return __clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0,
363 cached_state, GFP_NOFS, NULL);
364}
365
366static inline int set_extent_dirty(struct extent_io_tree *tree, u64 start,
367 u64 end, gfp_t mask)
368{
369 return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL,
370 NULL, mask);
371}
372
373static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start,
374 u64 end)
375{
376 return clear_extent_bit(tree, start, end,
377 EXTENT_DIRTY | EXTENT_DELALLOC |
378 EXTENT_DO_ACCOUNTING, 0, 0, NULL);
379}
380
381int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
382 unsigned bits, unsigned clear_bits,
383 struct extent_state **cached_state);
384
385static inline int set_extent_delalloc(struct extent_io_tree *tree, u64 start,
386 u64 end, unsigned int extra_bits,
387 struct extent_state **cached_state)
388{
389 return set_extent_bit(tree, start, end,
390 EXTENT_DELALLOC | EXTENT_UPTODATE | extra_bits,
391 NULL, cached_state, GFP_NOFS);
392}
393
394static inline int set_extent_defrag(struct extent_io_tree *tree, u64 start,
395 u64 end, struct extent_state **cached_state)
396{
397 return set_extent_bit(tree, start, end,
398 EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG,
399 NULL, cached_state, GFP_NOFS);
400}
401
402static inline int set_extent_new(struct extent_io_tree *tree, u64 start,
403 u64 end)
404{
405 return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, NULL,
406 GFP_NOFS);
407}
408
409static inline int set_extent_uptodate(struct extent_io_tree *tree, u64 start,
410 u64 end, struct extent_state **cached_state, gfp_t mask)
411{
412 return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL,
413 cached_state, mask);
414}
415
416int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
417 u64 *start_ret, u64 *end_ret, unsigned bits,
418 struct extent_state **cached_state);
419int extent_invalidatepage(struct extent_io_tree *tree,
420 struct page *page, unsigned long offset);
421int extent_write_full_page(struct page *page, struct writeback_control *wbc);
422int extent_write_locked_range(struct inode *inode, u64 start, u64 end,
423 int mode);
424int extent_writepages(struct extent_io_tree *tree,
425 struct address_space *mapping,
426 struct writeback_control *wbc);
427int btree_write_cache_pages(struct address_space *mapping,
428 struct writeback_control *wbc);
429int extent_readpages(struct extent_io_tree *tree,
430 struct address_space *mapping,
431 struct list_head *pages, unsigned nr_pages);
432int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
433 __u64 start, __u64 len);
434void set_page_extent_mapped(struct page *page);
435
436struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
437 u64 start);
438struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
439 u64 start, unsigned long len);
440struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
441 u64 start);
442struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
443struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
444 u64 start);
445void free_extent_buffer(struct extent_buffer *eb);
446void free_extent_buffer_stale(struct extent_buffer *eb);
447#define WAIT_NONE 0
448#define WAIT_COMPLETE 1
449#define WAIT_PAGE_LOCK 2
450int read_extent_buffer_pages(struct extent_io_tree *tree,
451 struct extent_buffer *eb, int wait,
452 int mirror_num);
453void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
454
455static inline unsigned long num_extent_pages(u64 start, u64 len)
456{
457 return ((start + len + PAGE_SIZE - 1) >> PAGE_SHIFT) -
458 (start >> PAGE_SHIFT);
459}
460
461static inline void extent_buffer_get(struct extent_buffer *eb)
462{
463 atomic_inc(&eb->refs);
464}
465
466static inline int extent_buffer_uptodate(struct extent_buffer *eb)
467{
468 return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
469}
470
471int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
472 unsigned long start, unsigned long len);
473void read_extent_buffer(const struct extent_buffer *eb, void *dst,
474 unsigned long start,
475 unsigned long len);
476int read_extent_buffer_to_user(const struct extent_buffer *eb,
477 void __user *dst, unsigned long start,
478 unsigned long len);
479void write_extent_buffer_fsid(struct extent_buffer *eb, const void *src);
480void write_extent_buffer_chunk_tree_uuid(struct extent_buffer *eb,
481 const void *src);
482void write_extent_buffer(struct extent_buffer *eb, const void *src,
483 unsigned long start, unsigned long len);
484void copy_extent_buffer_full(struct extent_buffer *dst,
485 struct extent_buffer *src);
486void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
487 unsigned long dst_offset, unsigned long src_offset,
488 unsigned long len);
489void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
490 unsigned long src_offset, unsigned long len);
491void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
492 unsigned long src_offset, unsigned long len);
493void memzero_extent_buffer(struct extent_buffer *eb, unsigned long start,
494 unsigned long len);
495int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
496 unsigned long pos);
497void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
498 unsigned long pos, unsigned long len);
499void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
500 unsigned long pos, unsigned long len);
501void clear_extent_buffer_dirty(struct extent_buffer *eb);
502int set_extent_buffer_dirty(struct extent_buffer *eb);
503void set_extent_buffer_uptodate(struct extent_buffer *eb);
504void clear_extent_buffer_uptodate(struct extent_buffer *eb);
505int extent_buffer_under_io(struct extent_buffer *eb);
506int map_private_extent_buffer(const struct extent_buffer *eb,
507 unsigned long offset, unsigned long min_len,
508 char **map, unsigned long *map_start,
509 unsigned long *map_len);
510void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
511void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
512void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
513 u64 delalloc_end, struct page *locked_page,
514 unsigned bits_to_clear,
515 unsigned long page_ops);
516struct bio *btrfs_bio_alloc(struct block_device *bdev, u64 first_byte);
517struct bio *btrfs_io_bio_alloc(unsigned int nr_iovecs);
518struct bio *btrfs_bio_clone(struct bio *bio);
519struct bio *btrfs_bio_clone_partial(struct bio *orig, int offset, int size);
520
521struct btrfs_fs_info;
522struct btrfs_inode;
523
524int repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start,
525 u64 length, u64 logical, struct page *page,
526 unsigned int pg_offset, int mirror_num);
527int clean_io_failure(struct btrfs_fs_info *fs_info,
528 struct extent_io_tree *failure_tree,
529 struct extent_io_tree *io_tree, u64 start,
530 struct page *page, u64 ino, unsigned int pg_offset);
531void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
532int repair_eb_io_failure(struct btrfs_fs_info *fs_info,
533 struct extent_buffer *eb, int mirror_num);
534
535/*
536 * When IO fails, either with EIO or csum verification fails, we
537 * try other mirrors that might have a good copy of the data. This
538 * io_failure_record is used to record state as we go through all the
539 * mirrors. If another mirror has good data, the page is set up to date
540 * and things continue. If a good mirror can't be found, the original
541 * bio end_io callback is called to indicate things have failed.
542 */
543struct io_failure_record {
544 struct page *page;
545 u64 start;
546 u64 len;
547 u64 logical;
548 unsigned long bio_flags;
549 int this_mirror;
550 int failed_mirror;
551 int in_validation;
552};
553
554
555void btrfs_free_io_failure_record(struct btrfs_inode *inode, u64 start,
556 u64 end);
557int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end,
558 struct io_failure_record **failrec_ret);
559bool btrfs_check_repairable(struct inode *inode, unsigned failed_bio_pages,
560 struct io_failure_record *failrec, int fail_mirror);
561struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio,
562 struct io_failure_record *failrec,
563 struct page *page, int pg_offset, int icsum,
564 bio_end_io_t *endio_func, void *data);
565int free_io_failure(struct extent_io_tree *failure_tree,
566 struct extent_io_tree *io_tree,
567 struct io_failure_record *rec);
568#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
569noinline u64 find_lock_delalloc_range(struct inode *inode,
570 struct extent_io_tree *tree,
571 struct page *locked_page, u64 *start,
572 u64 *end, u64 max_bytes);
573#endif
574struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
575 u64 start);
576
577#endif