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1/* SPDX-License-Identifier: GPL-2.0 */
2
3#ifndef BTRFS_EXTENT_IO_H
4#define BTRFS_EXTENT_IO_H
5
6#include <linux/rbtree.h>
7#include <linux/refcount.h>
8#include <linux/fiemap.h>
9#include <linux/btrfs_tree.h>
10#include "compression.h"
11#include "ulist.h"
12#include "misc.h"
13
14struct btrfs_trans_handle;
15
16enum {
17 EXTENT_BUFFER_UPTODATE,
18 EXTENT_BUFFER_DIRTY,
19 EXTENT_BUFFER_CORRUPT,
20 /* this got triggered by readahead */
21 EXTENT_BUFFER_READAHEAD,
22 EXTENT_BUFFER_TREE_REF,
23 EXTENT_BUFFER_STALE,
24 EXTENT_BUFFER_WRITEBACK,
25 /* read IO error */
26 EXTENT_BUFFER_READ_ERR,
27 EXTENT_BUFFER_UNMAPPED,
28 EXTENT_BUFFER_IN_TREE,
29 /* write IO error */
30 EXTENT_BUFFER_WRITE_ERR,
31 /* Indicate the extent buffer is written zeroed out (for zoned) */
32 EXTENT_BUFFER_ZONED_ZEROOUT,
33 /* Indicate that extent buffer pages a being read */
34 EXTENT_BUFFER_READING,
35};
36
37/* these are flags for __process_pages_contig */
38enum {
39 ENUM_BIT(PAGE_UNLOCK),
40 /* Page starts writeback, clear dirty bit and set writeback bit */
41 ENUM_BIT(PAGE_START_WRITEBACK),
42 ENUM_BIT(PAGE_END_WRITEBACK),
43 ENUM_BIT(PAGE_SET_ORDERED),
44};
45
46/*
47 * Folio private values. Every page that is controlled by the extent map has
48 * folio private set to this value.
49 */
50#define EXTENT_FOLIO_PRIVATE 1
51
52/*
53 * The extent buffer bitmap operations are done with byte granularity instead of
54 * word granularity for two reasons:
55 * 1. The bitmaps must be little-endian on disk.
56 * 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
57 * single word in a bitmap may straddle two pages in the extent buffer.
58 */
59#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
60#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
61#define BITMAP_FIRST_BYTE_MASK(start) \
62 ((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
63#define BITMAP_LAST_BYTE_MASK(nbits) \
64 (BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
65
66struct btrfs_root;
67struct btrfs_inode;
68struct btrfs_fs_info;
69struct extent_io_tree;
70struct btrfs_tree_parent_check;
71
72int __init extent_buffer_init_cachep(void);
73void __cold extent_buffer_free_cachep(void);
74
75#define INLINE_EXTENT_BUFFER_PAGES (BTRFS_MAX_METADATA_BLOCKSIZE / PAGE_SIZE)
76struct extent_buffer {
77 u64 start;
78 unsigned long len;
79 unsigned long bflags;
80 struct btrfs_fs_info *fs_info;
81
82 /*
83 * The address where the eb can be accessed without any cross-page handling.
84 * This can be NULL if not possible.
85 */
86 void *addr;
87
88 spinlock_t refs_lock;
89 atomic_t refs;
90 int read_mirror;
91 /* >= 0 if eb belongs to a log tree, -1 otherwise */
92 s8 log_index;
93 struct rcu_head rcu_head;
94
95 struct rw_semaphore lock;
96
97 /*
98 * Pointers to all the folios of the extent buffer.
99 *
100 * For now the folio is always order 0 (aka, a single page).
101 */
102 struct folio *folios[INLINE_EXTENT_BUFFER_PAGES];
103#ifdef CONFIG_BTRFS_DEBUG
104 struct list_head leak_list;
105 pid_t lock_owner;
106#endif
107};
108
109struct btrfs_eb_write_context {
110 struct writeback_control *wbc;
111 struct extent_buffer *eb;
112 /* Block group @eb resides in. Only used for zoned mode. */
113 struct btrfs_block_group *zoned_bg;
114};
115
116/*
117 * Get the correct offset inside the page of extent buffer.
118 *
119 * @eb: target extent buffer
120 * @start: offset inside the extent buffer
121 *
122 * Will handle both sectorsize == PAGE_SIZE and sectorsize < PAGE_SIZE cases.
123 */
124static inline size_t get_eb_offset_in_folio(const struct extent_buffer *eb,
125 unsigned long offset)
126{
127 /*
128 * 1) sectorsize == PAGE_SIZE and nodesize >= PAGE_SIZE case
129 * 1.1) One large folio covering the whole eb
130 * The eb->start is aligned to folio size, thus adding it
131 * won't cause any difference.
132 * 1.2) Several page sized folios
133 * The eb->start is aligned to folio (page) size, thus
134 * adding it won't cause any difference.
135 *
136 * 2) sectorsize < PAGE_SIZE and nodesize < PAGE_SIZE case
137 * In this case there would only be one page sized folio, and there
138 * may be several different extent buffers in the page/folio.
139 * We need to add eb->start to properly access the offset inside
140 * that eb.
141 */
142 return offset_in_folio(eb->folios[0], offset + eb->start);
143}
144
145static inline unsigned long get_eb_folio_index(const struct extent_buffer *eb,
146 unsigned long offset)
147{
148 /*
149 * 1) sectorsize == PAGE_SIZE and nodesize >= PAGE_SIZE case
150 * 1.1) One large folio covering the whole eb.
151 * the folio_shift would be large enough to always make us
152 * return 0 as index.
153 * 1.2) Several page sized folios
154 * The folio_shift() would be PAGE_SHIFT, giving us the correct
155 * index.
156 *
157 * 2) sectorsize < PAGE_SIZE and nodesize < PAGE_SIZE case
158 * The folio would only be page sized, and always give us 0 as index.
159 */
160 return offset >> folio_shift(eb->folios[0]);
161}
162
163/*
164 * Structure to record how many bytes and which ranges are set/cleared
165 */
166struct extent_changeset {
167 /* How many bytes are set/cleared in this operation */
168 u64 bytes_changed;
169
170 /* Changed ranges */
171 struct ulist range_changed;
172};
173
174static inline void extent_changeset_init(struct extent_changeset *changeset)
175{
176 changeset->bytes_changed = 0;
177 ulist_init(&changeset->range_changed);
178}
179
180static inline struct extent_changeset *extent_changeset_alloc(void)
181{
182 struct extent_changeset *ret;
183
184 ret = kmalloc(sizeof(*ret), GFP_KERNEL);
185 if (!ret)
186 return NULL;
187
188 extent_changeset_init(ret);
189 return ret;
190}
191
192static inline void extent_changeset_release(struct extent_changeset *changeset)
193{
194 if (!changeset)
195 return;
196 changeset->bytes_changed = 0;
197 ulist_release(&changeset->range_changed);
198}
199
200static inline void extent_changeset_free(struct extent_changeset *changeset)
201{
202 if (!changeset)
203 return;
204 extent_changeset_release(changeset);
205 kfree(changeset);
206}
207
208struct extent_map_tree;
209
210int try_release_extent_mapping(struct page *page, gfp_t mask);
211int try_release_extent_buffer(struct page *page);
212
213int btrfs_read_folio(struct file *file, struct folio *folio);
214void extent_write_locked_range(struct inode *inode, struct page *locked_page,
215 u64 start, u64 end, struct writeback_control *wbc,
216 bool pages_dirty);
217int extent_writepages(struct address_space *mapping,
218 struct writeback_control *wbc);
219int btree_write_cache_pages(struct address_space *mapping,
220 struct writeback_control *wbc);
221void extent_readahead(struct readahead_control *rac);
222int extent_fiemap(struct btrfs_inode *inode, struct fiemap_extent_info *fieinfo,
223 u64 start, u64 len);
224int set_page_extent_mapped(struct page *page);
225void clear_page_extent_mapped(struct page *page);
226
227struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
228 u64 start, u64 owner_root, int level);
229struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
230 u64 start, unsigned long len);
231struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
232 u64 start);
233struct extent_buffer *btrfs_clone_extent_buffer(const struct extent_buffer *src);
234struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
235 u64 start);
236void free_extent_buffer(struct extent_buffer *eb);
237void free_extent_buffer_stale(struct extent_buffer *eb);
238#define WAIT_NONE 0
239#define WAIT_COMPLETE 1
240#define WAIT_PAGE_LOCK 2
241int read_extent_buffer_pages(struct extent_buffer *eb, int wait, int mirror_num,
242 struct btrfs_tree_parent_check *parent_check);
243void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
244void btrfs_readahead_tree_block(struct btrfs_fs_info *fs_info,
245 u64 bytenr, u64 owner_root, u64 gen, int level);
246void btrfs_readahead_node_child(struct extent_buffer *node, int slot);
247
248static inline int num_extent_pages(const struct extent_buffer *eb)
249{
250 /*
251 * For sectorsize == PAGE_SIZE case, since nodesize is always aligned to
252 * sectorsize, it's just eb->len >> PAGE_SHIFT.
253 *
254 * For sectorsize < PAGE_SIZE case, we could have nodesize < PAGE_SIZE,
255 * thus have to ensure we get at least one page.
256 */
257 return (eb->len >> PAGE_SHIFT) ?: 1;
258}
259
260/*
261 * This can only be determined at runtime by checking eb::folios[0].
262 *
263 * As we can have either one large folio covering the whole eb
264 * (either nodesize <= PAGE_SIZE, or high order folio), or multiple
265 * single-paged folios.
266 */
267static inline int num_extent_folios(const struct extent_buffer *eb)
268{
269 if (folio_order(eb->folios[0]))
270 return 1;
271 return num_extent_pages(eb);
272}
273
274static inline int extent_buffer_uptodate(const struct extent_buffer *eb)
275{
276 return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
277}
278
279int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
280 unsigned long start, unsigned long len);
281void read_extent_buffer(const struct extent_buffer *eb, void *dst,
282 unsigned long start,
283 unsigned long len);
284int read_extent_buffer_to_user_nofault(const struct extent_buffer *eb,
285 void __user *dst, unsigned long start,
286 unsigned long len);
287void write_extent_buffer(const struct extent_buffer *eb, const void *src,
288 unsigned long start, unsigned long len);
289
290static inline void write_extent_buffer_chunk_tree_uuid(
291 const struct extent_buffer *eb, const void *chunk_tree_uuid)
292{
293 write_extent_buffer(eb, chunk_tree_uuid,
294 offsetof(struct btrfs_header, chunk_tree_uuid),
295 BTRFS_FSID_SIZE);
296}
297
298static inline void write_extent_buffer_fsid(const struct extent_buffer *eb,
299 const void *fsid)
300{
301 write_extent_buffer(eb, fsid, offsetof(struct btrfs_header, fsid),
302 BTRFS_FSID_SIZE);
303}
304
305void copy_extent_buffer_full(const struct extent_buffer *dst,
306 const struct extent_buffer *src);
307void copy_extent_buffer(const struct extent_buffer *dst,
308 const struct extent_buffer *src,
309 unsigned long dst_offset, unsigned long src_offset,
310 unsigned long len);
311void memcpy_extent_buffer(const struct extent_buffer *dst,
312 unsigned long dst_offset, unsigned long src_offset,
313 unsigned long len);
314void memmove_extent_buffer(const struct extent_buffer *dst,
315 unsigned long dst_offset, unsigned long src_offset,
316 unsigned long len);
317void memzero_extent_buffer(const struct extent_buffer *eb, unsigned long start,
318 unsigned long len);
319int extent_buffer_test_bit(const struct extent_buffer *eb, unsigned long start,
320 unsigned long pos);
321void extent_buffer_bitmap_set(const struct extent_buffer *eb, unsigned long start,
322 unsigned long pos, unsigned long len);
323void extent_buffer_bitmap_clear(const struct extent_buffer *eb,
324 unsigned long start, unsigned long pos,
325 unsigned long len);
326void set_extent_buffer_dirty(struct extent_buffer *eb);
327void set_extent_buffer_uptodate(struct extent_buffer *eb);
328void clear_extent_buffer_uptodate(struct extent_buffer *eb);
329void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
330void extent_clear_unlock_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
331 struct page *locked_page,
332 u32 bits_to_clear, unsigned long page_ops);
333int extent_invalidate_folio(struct extent_io_tree *tree,
334 struct folio *folio, size_t offset);
335void btrfs_clear_buffer_dirty(struct btrfs_trans_handle *trans,
336 struct extent_buffer *buf);
337
338int btrfs_alloc_page_array(unsigned int nr_pages, struct page **page_array,
339 gfp_t extra_gfp);
340
341#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
342bool find_lock_delalloc_range(struct inode *inode,
343 struct page *locked_page, u64 *start,
344 u64 *end);
345#endif
346struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
347 u64 start);
348
349#ifdef CONFIG_BTRFS_DEBUG
350void btrfs_extent_buffer_leak_debug_check(struct btrfs_fs_info *fs_info);
351#else
352#define btrfs_extent_buffer_leak_debug_check(fs_info) do {} while (0)
353#endif
354
355#endif
1/* SPDX-License-Identifier: GPL-2.0 */
2
3#ifndef BTRFS_EXTENT_IO_H
4#define BTRFS_EXTENT_IO_H
5
6#include <linux/rbtree.h>
7#include <linux/refcount.h>
8#include "ulist.h"
9
10/* bits for the extent state */
11#define EXTENT_DIRTY (1U << 0)
12#define EXTENT_UPTODATE (1U << 1)
13#define EXTENT_LOCKED (1U << 2)
14#define EXTENT_NEW (1U << 3)
15#define EXTENT_DELALLOC (1U << 4)
16#define EXTENT_DEFRAG (1U << 5)
17#define EXTENT_BOUNDARY (1U << 6)
18#define EXTENT_NODATASUM (1U << 7)
19#define EXTENT_CLEAR_META_RESV (1U << 8)
20#define EXTENT_NEED_WAIT (1U << 9)
21#define EXTENT_DAMAGED (1U << 10)
22#define EXTENT_NORESERVE (1U << 11)
23#define EXTENT_QGROUP_RESERVED (1U << 12)
24#define EXTENT_CLEAR_DATA_RESV (1U << 13)
25#define EXTENT_DELALLOC_NEW (1U << 14)
26#define EXTENT_DO_ACCOUNTING (EXTENT_CLEAR_META_RESV | \
27 EXTENT_CLEAR_DATA_RESV)
28#define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING)
29
30/*
31 * Redefined bits above which are used only in the device allocation tree,
32 * shouldn't be using EXTENT_LOCKED / EXTENT_BOUNDARY / EXTENT_CLEAR_META_RESV
33 * / EXTENT_CLEAR_DATA_RESV because they have special meaning to the bit
34 * manipulation functions
35 */
36#define CHUNK_ALLOCATED EXTENT_DIRTY
37#define CHUNK_TRIMMED EXTENT_DEFRAG
38
39/*
40 * flags for bio submission. The high bits indicate the compression
41 * type for this bio
42 */
43#define EXTENT_BIO_COMPRESSED 1
44#define EXTENT_BIO_FLAG_SHIFT 16
45
46enum {
47 EXTENT_BUFFER_UPTODATE,
48 EXTENT_BUFFER_DIRTY,
49 EXTENT_BUFFER_CORRUPT,
50 /* this got triggered by readahead */
51 EXTENT_BUFFER_READAHEAD,
52 EXTENT_BUFFER_TREE_REF,
53 EXTENT_BUFFER_STALE,
54 EXTENT_BUFFER_WRITEBACK,
55 /* read IO error */
56 EXTENT_BUFFER_READ_ERR,
57 EXTENT_BUFFER_UNMAPPED,
58 EXTENT_BUFFER_IN_TREE,
59 /* write IO error */
60 EXTENT_BUFFER_WRITE_ERR,
61};
62
63/* these are flags for __process_pages_contig */
64#define PAGE_UNLOCK (1 << 0)
65#define PAGE_CLEAR_DIRTY (1 << 1)
66#define PAGE_SET_WRITEBACK (1 << 2)
67#define PAGE_END_WRITEBACK (1 << 3)
68#define PAGE_SET_PRIVATE2 (1 << 4)
69#define PAGE_SET_ERROR (1 << 5)
70#define PAGE_LOCK (1 << 6)
71
72/*
73 * page->private values. Every page that is controlled by the extent
74 * map has page->private set to one.
75 */
76#define EXTENT_PAGE_PRIVATE 1
77
78/*
79 * The extent buffer bitmap operations are done with byte granularity instead of
80 * word granularity for two reasons:
81 * 1. The bitmaps must be little-endian on disk.
82 * 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
83 * single word in a bitmap may straddle two pages in the extent buffer.
84 */
85#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
86#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
87#define BITMAP_FIRST_BYTE_MASK(start) \
88 ((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
89#define BITMAP_LAST_BYTE_MASK(nbits) \
90 (BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
91
92struct extent_state;
93struct btrfs_root;
94struct btrfs_inode;
95struct btrfs_io_bio;
96struct io_failure_record;
97
98
99typedef blk_status_t (extent_submit_bio_start_t)(void *private_data,
100 struct bio *bio, u64 bio_offset);
101
102struct extent_io_ops {
103 /*
104 * The following callbacks must be always defined, the function
105 * pointer will be called unconditionally.
106 */
107 blk_status_t (*submit_bio_hook)(struct inode *inode, struct bio *bio,
108 int mirror_num, unsigned long bio_flags);
109 int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset,
110 struct page *page, u64 start, u64 end,
111 int mirror);
112};
113
114enum {
115 IO_TREE_FS_INFO_FREED_EXTENTS0,
116 IO_TREE_FS_INFO_FREED_EXTENTS1,
117 IO_TREE_INODE_IO,
118 IO_TREE_INODE_IO_FAILURE,
119 IO_TREE_RELOC_BLOCKS,
120 IO_TREE_TRANS_DIRTY_PAGES,
121 IO_TREE_ROOT_DIRTY_LOG_PAGES,
122 IO_TREE_SELFTEST,
123};
124
125struct extent_io_tree {
126 struct rb_root state;
127 struct btrfs_fs_info *fs_info;
128 void *private_data;
129 u64 dirty_bytes;
130 bool track_uptodate;
131
132 /* Who owns this io tree, should be one of IO_TREE_* */
133 u8 owner;
134
135 spinlock_t lock;
136 const struct extent_io_ops *ops;
137};
138
139struct extent_state {
140 u64 start;
141 u64 end; /* inclusive */
142 struct rb_node rb_node;
143
144 /* ADD NEW ELEMENTS AFTER THIS */
145 wait_queue_head_t wq;
146 refcount_t refs;
147 unsigned state;
148
149 struct io_failure_record *failrec;
150
151#ifdef CONFIG_BTRFS_DEBUG
152 struct list_head leak_list;
153#endif
154};
155
156#define INLINE_EXTENT_BUFFER_PAGES 16
157#define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_SIZE)
158struct extent_buffer {
159 u64 start;
160 unsigned long len;
161 unsigned long bflags;
162 struct btrfs_fs_info *fs_info;
163 spinlock_t refs_lock;
164 atomic_t refs;
165 atomic_t io_pages;
166 int read_mirror;
167 struct rcu_head rcu_head;
168 pid_t lock_owner;
169
170 int blocking_writers;
171 atomic_t blocking_readers;
172 bool lock_nested;
173 /* >= 0 if eb belongs to a log tree, -1 otherwise */
174 short log_index;
175
176 /* protects write locks */
177 rwlock_t lock;
178
179 /* readers use lock_wq while they wait for the write
180 * lock holders to unlock
181 */
182 wait_queue_head_t write_lock_wq;
183
184 /* writers use read_lock_wq while they wait for readers
185 * to unlock
186 */
187 wait_queue_head_t read_lock_wq;
188 struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
189#ifdef CONFIG_BTRFS_DEBUG
190 int spinning_writers;
191 atomic_t spinning_readers;
192 atomic_t read_locks;
193 int write_locks;
194 struct list_head leak_list;
195#endif
196};
197
198/*
199 * Structure to record how many bytes and which ranges are set/cleared
200 */
201struct extent_changeset {
202 /* How many bytes are set/cleared in this operation */
203 unsigned int bytes_changed;
204
205 /* Changed ranges */
206 struct ulist range_changed;
207};
208
209static inline void extent_changeset_init(struct extent_changeset *changeset)
210{
211 changeset->bytes_changed = 0;
212 ulist_init(&changeset->range_changed);
213}
214
215static inline struct extent_changeset *extent_changeset_alloc(void)
216{
217 struct extent_changeset *ret;
218
219 ret = kmalloc(sizeof(*ret), GFP_KERNEL);
220 if (!ret)
221 return NULL;
222
223 extent_changeset_init(ret);
224 return ret;
225}
226
227static inline void extent_changeset_release(struct extent_changeset *changeset)
228{
229 if (!changeset)
230 return;
231 changeset->bytes_changed = 0;
232 ulist_release(&changeset->range_changed);
233}
234
235static inline void extent_changeset_free(struct extent_changeset *changeset)
236{
237 if (!changeset)
238 return;
239 extent_changeset_release(changeset);
240 kfree(changeset);
241}
242
243static inline void extent_set_compress_type(unsigned long *bio_flags,
244 int compress_type)
245{
246 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
247}
248
249static inline int extent_compress_type(unsigned long bio_flags)
250{
251 return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
252}
253
254struct extent_map_tree;
255
256typedef struct extent_map *(get_extent_t)(struct btrfs_inode *inode,
257 struct page *page,
258 size_t pg_offset,
259 u64 start, u64 len,
260 int create);
261
262void extent_io_tree_init(struct btrfs_fs_info *fs_info,
263 struct extent_io_tree *tree, unsigned int owner,
264 void *private_data);
265void extent_io_tree_release(struct extent_io_tree *tree);
266int try_release_extent_mapping(struct page *page, gfp_t mask);
267int try_release_extent_buffer(struct page *page);
268int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
269 struct extent_state **cached);
270
271static inline int lock_extent(struct extent_io_tree *tree, u64 start, u64 end)
272{
273 return lock_extent_bits(tree, start, end, NULL);
274}
275
276int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
277int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
278 get_extent_t *get_extent, int mirror_num);
279int __init extent_io_init(void);
280void __cold extent_io_exit(void);
281
282u64 count_range_bits(struct extent_io_tree *tree,
283 u64 *start, u64 search_end,
284 u64 max_bytes, unsigned bits, int contig);
285
286void free_extent_state(struct extent_state *state);
287int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
288 unsigned bits, int filled,
289 struct extent_state *cached_state);
290int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
291 unsigned bits, struct extent_changeset *changeset);
292int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
293 unsigned bits, int wake, int delete,
294 struct extent_state **cached);
295int __clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
296 unsigned bits, int wake, int delete,
297 struct extent_state **cached, gfp_t mask,
298 struct extent_changeset *changeset);
299
300static inline int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end)
301{
302 return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL);
303}
304
305static inline int unlock_extent_cached(struct extent_io_tree *tree, u64 start,
306 u64 end, struct extent_state **cached)
307{
308 return __clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached,
309 GFP_NOFS, NULL);
310}
311
312static inline int unlock_extent_cached_atomic(struct extent_io_tree *tree,
313 u64 start, u64 end, struct extent_state **cached)
314{
315 return __clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached,
316 GFP_ATOMIC, NULL);
317}
318
319static inline int clear_extent_bits(struct extent_io_tree *tree, u64 start,
320 u64 end, unsigned bits)
321{
322 int wake = 0;
323
324 if (bits & EXTENT_LOCKED)
325 wake = 1;
326
327 return clear_extent_bit(tree, start, end, bits, wake, 0, NULL);
328}
329
330int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
331 unsigned bits, struct extent_changeset *changeset);
332int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
333 unsigned bits, u64 *failed_start,
334 struct extent_state **cached_state, gfp_t mask);
335int set_extent_bits_nowait(struct extent_io_tree *tree, u64 start, u64 end,
336 unsigned bits);
337
338static inline int set_extent_bits(struct extent_io_tree *tree, u64 start,
339 u64 end, unsigned bits)
340{
341 return set_extent_bit(tree, start, end, bits, NULL, NULL, GFP_NOFS);
342}
343
344static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
345 u64 end, struct extent_state **cached_state)
346{
347 return __clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0,
348 cached_state, GFP_NOFS, NULL);
349}
350
351static inline int set_extent_dirty(struct extent_io_tree *tree, u64 start,
352 u64 end, gfp_t mask)
353{
354 return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL,
355 NULL, mask);
356}
357
358static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start,
359 u64 end, struct extent_state **cached)
360{
361 return clear_extent_bit(tree, start, end,
362 EXTENT_DIRTY | EXTENT_DELALLOC |
363 EXTENT_DO_ACCOUNTING, 0, 0, cached);
364}
365
366int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
367 unsigned bits, unsigned clear_bits,
368 struct extent_state **cached_state);
369
370static inline int set_extent_delalloc(struct extent_io_tree *tree, u64 start,
371 u64 end, unsigned int extra_bits,
372 struct extent_state **cached_state)
373{
374 return set_extent_bit(tree, start, end,
375 EXTENT_DELALLOC | EXTENT_UPTODATE | extra_bits,
376 NULL, cached_state, GFP_NOFS);
377}
378
379static inline int set_extent_defrag(struct extent_io_tree *tree, u64 start,
380 u64 end, struct extent_state **cached_state)
381{
382 return set_extent_bit(tree, start, end,
383 EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG,
384 NULL, cached_state, GFP_NOFS);
385}
386
387static inline int set_extent_new(struct extent_io_tree *tree, u64 start,
388 u64 end)
389{
390 return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, NULL,
391 GFP_NOFS);
392}
393
394static inline int set_extent_uptodate(struct extent_io_tree *tree, u64 start,
395 u64 end, struct extent_state **cached_state, gfp_t mask)
396{
397 return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL,
398 cached_state, mask);
399}
400
401int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
402 u64 *start_ret, u64 *end_ret, unsigned bits,
403 struct extent_state **cached_state);
404void find_first_clear_extent_bit(struct extent_io_tree *tree, u64 start,
405 u64 *start_ret, u64 *end_ret, unsigned bits);
406int extent_invalidatepage(struct extent_io_tree *tree,
407 struct page *page, unsigned long offset);
408int extent_write_full_page(struct page *page, struct writeback_control *wbc);
409int extent_write_locked_range(struct inode *inode, u64 start, u64 end,
410 int mode);
411int extent_writepages(struct address_space *mapping,
412 struct writeback_control *wbc);
413int btree_write_cache_pages(struct address_space *mapping,
414 struct writeback_control *wbc);
415int extent_readpages(struct address_space *mapping, struct list_head *pages,
416 unsigned nr_pages);
417int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
418 __u64 start, __u64 len);
419void set_page_extent_mapped(struct page *page);
420
421struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
422 u64 start);
423struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
424 u64 start, unsigned long len);
425struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
426 u64 start);
427struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
428struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
429 u64 start);
430void free_extent_buffer(struct extent_buffer *eb);
431void free_extent_buffer_stale(struct extent_buffer *eb);
432#define WAIT_NONE 0
433#define WAIT_COMPLETE 1
434#define WAIT_PAGE_LOCK 2
435int read_extent_buffer_pages(struct extent_buffer *eb, int wait,
436 int mirror_num);
437void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
438
439static inline int num_extent_pages(const struct extent_buffer *eb)
440{
441 return (round_up(eb->start + eb->len, PAGE_SIZE) >> PAGE_SHIFT) -
442 (eb->start >> PAGE_SHIFT);
443}
444
445static inline void extent_buffer_get(struct extent_buffer *eb)
446{
447 atomic_inc(&eb->refs);
448}
449
450static inline int extent_buffer_uptodate(struct extent_buffer *eb)
451{
452 return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
453}
454
455int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
456 unsigned long start, unsigned long len);
457void read_extent_buffer(const struct extent_buffer *eb, void *dst,
458 unsigned long start,
459 unsigned long len);
460int read_extent_buffer_to_user(const struct extent_buffer *eb,
461 void __user *dst, unsigned long start,
462 unsigned long len);
463void write_extent_buffer_fsid(struct extent_buffer *eb, const void *src);
464void write_extent_buffer_chunk_tree_uuid(struct extent_buffer *eb,
465 const void *src);
466void write_extent_buffer(struct extent_buffer *eb, const void *src,
467 unsigned long start, unsigned long len);
468void copy_extent_buffer_full(struct extent_buffer *dst,
469 struct extent_buffer *src);
470void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
471 unsigned long dst_offset, unsigned long src_offset,
472 unsigned long len);
473void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
474 unsigned long src_offset, unsigned long len);
475void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
476 unsigned long src_offset, unsigned long len);
477void memzero_extent_buffer(struct extent_buffer *eb, unsigned long start,
478 unsigned long len);
479int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
480 unsigned long pos);
481void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
482 unsigned long pos, unsigned long len);
483void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
484 unsigned long pos, unsigned long len);
485void clear_extent_buffer_dirty(struct extent_buffer *eb);
486bool set_extent_buffer_dirty(struct extent_buffer *eb);
487void set_extent_buffer_uptodate(struct extent_buffer *eb);
488void clear_extent_buffer_uptodate(struct extent_buffer *eb);
489int extent_buffer_under_io(struct extent_buffer *eb);
490int map_private_extent_buffer(const struct extent_buffer *eb,
491 unsigned long offset, unsigned long min_len,
492 char **map, unsigned long *map_start,
493 unsigned long *map_len);
494void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
495void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
496void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
497 struct page *locked_page,
498 unsigned bits_to_clear,
499 unsigned long page_ops);
500struct bio *btrfs_bio_alloc(u64 first_byte);
501struct bio *btrfs_io_bio_alloc(unsigned int nr_iovecs);
502struct bio *btrfs_bio_clone(struct bio *bio);
503struct bio *btrfs_bio_clone_partial(struct bio *orig, int offset, int size);
504
505struct btrfs_fs_info;
506struct btrfs_inode;
507
508int repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start,
509 u64 length, u64 logical, struct page *page,
510 unsigned int pg_offset, int mirror_num);
511int clean_io_failure(struct btrfs_fs_info *fs_info,
512 struct extent_io_tree *failure_tree,
513 struct extent_io_tree *io_tree, u64 start,
514 struct page *page, u64 ino, unsigned int pg_offset);
515void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
516int btrfs_repair_eb_io_failure(struct extent_buffer *eb, int mirror_num);
517
518/*
519 * When IO fails, either with EIO or csum verification fails, we
520 * try other mirrors that might have a good copy of the data. This
521 * io_failure_record is used to record state as we go through all the
522 * mirrors. If another mirror has good data, the page is set up to date
523 * and things continue. If a good mirror can't be found, the original
524 * bio end_io callback is called to indicate things have failed.
525 */
526struct io_failure_record {
527 struct page *page;
528 u64 start;
529 u64 len;
530 u64 logical;
531 unsigned long bio_flags;
532 int this_mirror;
533 int failed_mirror;
534 int in_validation;
535};
536
537
538void btrfs_free_io_failure_record(struct btrfs_inode *inode, u64 start,
539 u64 end);
540int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end,
541 struct io_failure_record **failrec_ret);
542bool btrfs_check_repairable(struct inode *inode, unsigned failed_bio_pages,
543 struct io_failure_record *failrec, int fail_mirror);
544struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio,
545 struct io_failure_record *failrec,
546 struct page *page, int pg_offset, int icsum,
547 bio_end_io_t *endio_func, void *data);
548int free_io_failure(struct extent_io_tree *failure_tree,
549 struct extent_io_tree *io_tree,
550 struct io_failure_record *rec);
551#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
552bool find_lock_delalloc_range(struct inode *inode,
553 struct page *locked_page, u64 *start,
554 u64 *end);
555#endif
556struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
557 u64 start);
558
559#endif