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v6.2
  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
 14enum {
 15	EXTENT_BUFFER_UPTODATE,
 16	EXTENT_BUFFER_DIRTY,
 17	EXTENT_BUFFER_CORRUPT,
 18	/* this got triggered by readahead */
 19	EXTENT_BUFFER_READAHEAD,
 20	EXTENT_BUFFER_TREE_REF,
 21	EXTENT_BUFFER_STALE,
 22	EXTENT_BUFFER_WRITEBACK,
 23	/* read IO error */
 24	EXTENT_BUFFER_READ_ERR,
 25	EXTENT_BUFFER_UNMAPPED,
 26	EXTENT_BUFFER_IN_TREE,
 27	/* write IO error */
 28	EXTENT_BUFFER_WRITE_ERR,
 29	EXTENT_BUFFER_NO_CHECK,
 30};
 31
 32/* these are flags for __process_pages_contig */
 33enum {
 34	ENUM_BIT(PAGE_UNLOCK),
 35	/* Page starts writeback, clear dirty bit and set writeback bit */
 36	ENUM_BIT(PAGE_START_WRITEBACK),
 37	ENUM_BIT(PAGE_END_WRITEBACK),
 38	ENUM_BIT(PAGE_SET_ORDERED),
 39	ENUM_BIT(PAGE_SET_ERROR),
 40	ENUM_BIT(PAGE_LOCK),
 41};
 42
 43/*
 44 * page->private values.  Every page that is controlled by the extent
 45 * map has page->private set to one.
 46 */
 47#define EXTENT_PAGE_PRIVATE 1
 48
 49/*
 50 * The extent buffer bitmap operations are done with byte granularity instead of
 51 * word granularity for two reasons:
 52 * 1. The bitmaps must be little-endian on disk.
 53 * 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
 54 *    single word in a bitmap may straddle two pages in the extent buffer.
 55 */
 56#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
 57#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
 58#define BITMAP_FIRST_BYTE_MASK(start) \
 59	((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
 60#define BITMAP_LAST_BYTE_MASK(nbits) \
 61	(BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
 62
 63struct btrfs_bio;
 64struct btrfs_root;
 65struct btrfs_inode;
 66struct btrfs_fs_info;
 67struct io_failure_record;
 68struct extent_io_tree;
 69struct btrfs_tree_parent_check;
 70
 71int __init extent_buffer_init_cachep(void);
 72void __cold extent_buffer_free_cachep(void);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 73
 74#define INLINE_EXTENT_BUFFER_PAGES     (BTRFS_MAX_METADATA_BLOCKSIZE / PAGE_SIZE)
 
 
 75struct extent_buffer {
 76	u64 start;
 77	unsigned long len;
 78	unsigned long bflags;
 79	struct btrfs_fs_info *fs_info;
 80	spinlock_t refs_lock;
 81	atomic_t refs;
 82	atomic_t io_pages;
 83	int read_mirror;
 84	struct rcu_head rcu_head;
 85	pid_t lock_owner;
 
 
 
 
 86	/* >= 0 if eb belongs to a log tree, -1 otherwise */
 87	s8 log_index;
 88
 89	struct rw_semaphore lock;
 
 90
 
 
 
 
 
 
 
 
 
 91	struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
 92	struct list_head release_list;
 93#ifdef CONFIG_BTRFS_DEBUG
 
 
 
 
 94	struct list_head leak_list;
 95#endif
 96};
 97
 98/*
 99 * Get the correct offset inside the page of extent buffer.
100 *
101 * @eb:		target extent buffer
102 * @start:	offset inside the extent buffer
103 *
104 * Will handle both sectorsize == PAGE_SIZE and sectorsize < PAGE_SIZE cases.
105 */
106static inline size_t get_eb_offset_in_page(const struct extent_buffer *eb,
107					   unsigned long offset)
108{
109	/*
110	 * For sectorsize == PAGE_SIZE case, eb->start will always be aligned
111	 * to PAGE_SIZE, thus adding it won't cause any difference.
112	 *
113	 * For sectorsize < PAGE_SIZE, we must only read the data that belongs
114	 * to the eb, thus we have to take the eb->start into consideration.
115	 */
116	return offset_in_page(offset + eb->start);
117}
118
119static inline unsigned long get_eb_page_index(unsigned long offset)
120{
121	/*
122	 * For sectorsize == PAGE_SIZE case, plain >> PAGE_SHIFT is enough.
123	 *
124	 * For sectorsize < PAGE_SIZE case, we only support 64K PAGE_SIZE,
125	 * and have ensured that all tree blocks are contained in one page,
126	 * thus we always get index == 0.
127	 */
128	return offset >> PAGE_SHIFT;
129}
130
131/*
132 * Structure to record how many bytes and which ranges are set/cleared
133 */
134struct extent_changeset {
135	/* How many bytes are set/cleared in this operation */
136	u64 bytes_changed;
137
138	/* Changed ranges */
139	struct ulist range_changed;
140};
141
142static inline void extent_changeset_init(struct extent_changeset *changeset)
143{
144	changeset->bytes_changed = 0;
145	ulist_init(&changeset->range_changed);
146}
147
148static inline struct extent_changeset *extent_changeset_alloc(void)
149{
150	struct extent_changeset *ret;
151
152	ret = kmalloc(sizeof(*ret), GFP_KERNEL);
153	if (!ret)
154		return NULL;
155
156	extent_changeset_init(ret);
157	return ret;
158}
159
160static inline void extent_changeset_release(struct extent_changeset *changeset)
161{
162	if (!changeset)
163		return;
164	changeset->bytes_changed = 0;
165	ulist_release(&changeset->range_changed);
166}
167
168static inline void extent_changeset_free(struct extent_changeset *changeset)
169{
170	if (!changeset)
171		return;
172	extent_changeset_release(changeset);
173	kfree(changeset);
174}
175
 
 
 
 
 
 
 
 
 
 
 
176struct extent_map_tree;
177
 
 
 
 
178int try_release_extent_mapping(struct page *page, gfp_t mask);
179int try_release_extent_buffer(struct page *page);
180
181int btrfs_read_folio(struct file *file, struct folio *folio);
182int extent_write_locked_range(struct inode *inode, u64 start, u64 end);
 
 
 
183int extent_writepages(struct address_space *mapping,
184		      struct writeback_control *wbc);
185int btree_write_cache_pages(struct address_space *mapping,
186			    struct writeback_control *wbc);
187void extent_readahead(struct readahead_control *rac);
188int extent_fiemap(struct btrfs_inode *inode, struct fiemap_extent_info *fieinfo,
189		  u64 start, u64 len);
190int set_page_extent_mapped(struct page *page);
191void clear_page_extent_mapped(struct page *page);
192
193struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
194					  u64 start, u64 owner_root, int level);
195struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
196						  u64 start, unsigned long len);
197struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
198						u64 start);
199struct extent_buffer *btrfs_clone_extent_buffer(const struct extent_buffer *src);
200struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
201					 u64 start);
202void free_extent_buffer(struct extent_buffer *eb);
203void free_extent_buffer_stale(struct extent_buffer *eb);
204#define WAIT_NONE	0
205#define WAIT_COMPLETE	1
206#define WAIT_PAGE_LOCK	2
207int read_extent_buffer_pages(struct extent_buffer *eb, int wait, int mirror_num,
208			     struct btrfs_tree_parent_check *parent_check);
209void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
210void btrfs_readahead_tree_block(struct btrfs_fs_info *fs_info,
211				u64 bytenr, u64 owner_root, u64 gen, int level);
212void btrfs_readahead_node_child(struct extent_buffer *node, int slot);
213
214static inline int num_extent_pages(const struct extent_buffer *eb)
215{
216	/*
217	 * For sectorsize == PAGE_SIZE case, since nodesize is always aligned to
218	 * sectorsize, it's just eb->len >> PAGE_SHIFT.
219	 *
220	 * For sectorsize < PAGE_SIZE case, we could have nodesize < PAGE_SIZE,
221	 * thus have to ensure we get at least one page.
222	 */
223	return (eb->len >> PAGE_SHIFT) ?: 1;
224}
225
226static inline int extent_buffer_uptodate(const struct extent_buffer *eb)
227{
228	return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
229}
230
231int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
232			 unsigned long start, unsigned long len);
233void read_extent_buffer(const struct extent_buffer *eb, void *dst,
234			unsigned long start,
235			unsigned long len);
236int read_extent_buffer_to_user_nofault(const struct extent_buffer *eb,
237				       void __user *dst, unsigned long start,
238				       unsigned long len);
239void write_extent_buffer_fsid(const struct extent_buffer *eb, const void *src);
240void write_extent_buffer_chunk_tree_uuid(const struct extent_buffer *eb,
241		const void *src);
242void write_extent_buffer(const struct extent_buffer *eb, const void *src,
243			 unsigned long start, unsigned long len);
244void copy_extent_buffer_full(const struct extent_buffer *dst,
245			     const struct extent_buffer *src);
246void copy_extent_buffer(const struct extent_buffer *dst,
247			const struct extent_buffer *src,
248			unsigned long dst_offset, unsigned long src_offset,
249			unsigned long len);
250void memcpy_extent_buffer(const struct extent_buffer *dst,
251			  unsigned long dst_offset, unsigned long src_offset,
252			  unsigned long len);
253void memmove_extent_buffer(const struct extent_buffer *dst,
254			   unsigned long dst_offset, unsigned long src_offset,
255			   unsigned long len);
256void memzero_extent_buffer(const struct extent_buffer *eb, unsigned long start,
257			   unsigned long len);
258int extent_buffer_test_bit(const struct extent_buffer *eb, unsigned long start,
259			   unsigned long pos);
260void extent_buffer_bitmap_set(const struct extent_buffer *eb, unsigned long start,
261			      unsigned long pos, unsigned long len);
262void extent_buffer_bitmap_clear(const struct extent_buffer *eb,
263				unsigned long start, unsigned long pos,
264				unsigned long len);
265void clear_extent_buffer_dirty(const struct extent_buffer *eb);
266bool set_extent_buffer_dirty(struct extent_buffer *eb);
267void set_extent_buffer_uptodate(struct extent_buffer *eb);
268void clear_extent_buffer_uptodate(struct extent_buffer *eb);
269int extent_buffer_under_io(const struct extent_buffer *eb);
270void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
271void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
272void extent_clear_unlock_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
273				  struct page *locked_page,
274				  u32 bits_to_clear, unsigned long page_ops);
275int extent_invalidate_folio(struct extent_io_tree *tree,
276			    struct folio *folio, size_t offset);
 
 
 
277
278int btrfs_alloc_page_array(unsigned int nr_pages, struct page **page_array);
 
279
 
 
 
280void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
 
281
282/*
283 * When IO fails, either with EIO or csum verification fails, we
284 * try other mirrors that might have a good copy of the data.  This
285 * io_failure_record is used to record state as we go through all the
286 * mirrors.  If another mirror has good data, the sector is set up to date
287 * and things continue.  If a good mirror can't be found, the original
288 * bio end_io callback is called to indicate things have failed.
289 */
290struct io_failure_record {
291	/* Use rb_simple_node for search/insert */
292	struct {
293		struct rb_node rb_node;
294		u64 bytenr;
295	};
296	struct page *page;
 
297	u64 len;
298	u64 logical;
 
299	int this_mirror;
300	int failed_mirror;
301	int num_copies;
302};
303
304int btrfs_repair_one_sector(struct btrfs_inode *inode, struct btrfs_bio *failed_bbio,
305			    u32 bio_offset, struct page *page, unsigned int pgoff,
306			    bool submit_buffered);
307void btrfs_free_io_failure_record(struct btrfs_inode *inode, u64 start, u64 end);
308int btrfs_clean_io_failure(struct btrfs_inode *inode, u64 start,
309			   struct page *page, unsigned int pg_offset);
310
311#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
312bool find_lock_delalloc_range(struct inode *inode,
313			     struct page *locked_page, u64 *start,
314			     u64 *end);
315#endif
316struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
317					       u64 start);
318
319#ifdef CONFIG_BTRFS_DEBUG
320void btrfs_extent_buffer_leak_debug_check(struct btrfs_fs_info *fs_info);
321#else
322#define btrfs_extent_buffer_leak_debug_check(fs_info)	do {} while (0)
323#endif
324
325#endif
v5.9
  1/* SPDX-License-Identifier: GPL-2.0 */
  2
  3#ifndef BTRFS_EXTENT_IO_H
  4#define BTRFS_EXTENT_IO_H
  5
  6#include <linux/rbtree.h>
  7#include <linux/refcount.h>
  8#include <linux/fiemap.h>
 
 
  9#include "ulist.h"
 10
 11/*
 12 * flags for bio submission. The high bits indicate the compression
 13 * type for this bio
 14 */
 15#define EXTENT_BIO_COMPRESSED 1
 16#define EXTENT_BIO_FLAG_SHIFT 16
 17
 18enum {
 19	EXTENT_BUFFER_UPTODATE,
 20	EXTENT_BUFFER_DIRTY,
 21	EXTENT_BUFFER_CORRUPT,
 22	/* this got triggered by readahead */
 23	EXTENT_BUFFER_READAHEAD,
 24	EXTENT_BUFFER_TREE_REF,
 25	EXTENT_BUFFER_STALE,
 26	EXTENT_BUFFER_WRITEBACK,
 27	/* read IO error */
 28	EXTENT_BUFFER_READ_ERR,
 29	EXTENT_BUFFER_UNMAPPED,
 30	EXTENT_BUFFER_IN_TREE,
 31	/* write IO error */
 32	EXTENT_BUFFER_WRITE_ERR,
 
 33};
 34
 35/* these are flags for __process_pages_contig */
 36#define PAGE_UNLOCK		(1 << 0)
 37#define PAGE_CLEAR_DIRTY	(1 << 1)
 38#define PAGE_SET_WRITEBACK	(1 << 2)
 39#define PAGE_END_WRITEBACK	(1 << 3)
 40#define PAGE_SET_PRIVATE2	(1 << 4)
 41#define PAGE_SET_ERROR		(1 << 5)
 42#define PAGE_LOCK		(1 << 6)
 
 
 43
 44/*
 45 * page->private values.  Every page that is controlled by the extent
 46 * map has page->private set to one.
 47 */
 48#define EXTENT_PAGE_PRIVATE 1
 49
 50/*
 51 * The extent buffer bitmap operations are done with byte granularity instead of
 52 * word granularity for two reasons:
 53 * 1. The bitmaps must be little-endian on disk.
 54 * 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
 55 *    single word in a bitmap may straddle two pages in the extent buffer.
 56 */
 57#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
 58#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
 59#define BITMAP_FIRST_BYTE_MASK(start) \
 60	((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
 61#define BITMAP_LAST_BYTE_MASK(nbits) \
 62	(BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
 63
 
 64struct btrfs_root;
 65struct btrfs_inode;
 66struct btrfs_io_bio;
 67struct io_failure_record;
 68struct extent_io_tree;
 
 69
 70typedef blk_status_t (submit_bio_hook_t)(struct inode *inode, struct bio *bio,
 71					 int mirror_num,
 72					 unsigned long bio_flags);
 73
 74typedef blk_status_t (extent_submit_bio_start_t)(void *private_data,
 75		struct bio *bio, u64 bio_offset);
 76
 77struct extent_io_ops {
 78	/*
 79	 * The following callbacks must be always defined, the function
 80	 * pointer will be called unconditionally.
 81	 */
 82	submit_bio_hook_t *submit_bio_hook;
 83	int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset,
 84				    struct page *page, u64 start, u64 end,
 85				    int mirror);
 86};
 87
 88
 89#define INLINE_EXTENT_BUFFER_PAGES 16
 90#define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_SIZE)
 91struct extent_buffer {
 92	u64 start;
 93	unsigned long len;
 94	unsigned long bflags;
 95	struct btrfs_fs_info *fs_info;
 96	spinlock_t refs_lock;
 97	atomic_t refs;
 98	atomic_t io_pages;
 99	int read_mirror;
100	struct rcu_head rcu_head;
101	pid_t lock_owner;
102
103	int blocking_writers;
104	atomic_t blocking_readers;
105	bool lock_nested;
106	/* >= 0 if eb belongs to a log tree, -1 otherwise */
107	short log_index;
108
109	/* protects write locks */
110	rwlock_t lock;
111
112	/* readers use lock_wq while they wait for the write
113	 * lock holders to unlock
114	 */
115	wait_queue_head_t write_lock_wq;
116
117	/* writers use read_lock_wq while they wait for readers
118	 * to unlock
119	 */
120	wait_queue_head_t read_lock_wq;
121	struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
 
122#ifdef CONFIG_BTRFS_DEBUG
123	int spinning_writers;
124	atomic_t spinning_readers;
125	atomic_t read_locks;
126	int write_locks;
127	struct list_head leak_list;
128#endif
129};
130
131/*
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
132 * Structure to record how many bytes and which ranges are set/cleared
133 */
134struct extent_changeset {
135	/* How many bytes are set/cleared in this operation */
136	unsigned int bytes_changed;
137
138	/* Changed ranges */
139	struct ulist range_changed;
140};
141
142static inline void extent_changeset_init(struct extent_changeset *changeset)
143{
144	changeset->bytes_changed = 0;
145	ulist_init(&changeset->range_changed);
146}
147
148static inline struct extent_changeset *extent_changeset_alloc(void)
149{
150	struct extent_changeset *ret;
151
152	ret = kmalloc(sizeof(*ret), GFP_KERNEL);
153	if (!ret)
154		return NULL;
155
156	extent_changeset_init(ret);
157	return ret;
158}
159
160static inline void extent_changeset_release(struct extent_changeset *changeset)
161{
162	if (!changeset)
163		return;
164	changeset->bytes_changed = 0;
165	ulist_release(&changeset->range_changed);
166}
167
168static inline void extent_changeset_free(struct extent_changeset *changeset)
169{
170	if (!changeset)
171		return;
172	extent_changeset_release(changeset);
173	kfree(changeset);
174}
175
176static inline void extent_set_compress_type(unsigned long *bio_flags,
177					    int compress_type)
178{
179	*bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
180}
181
182static inline int extent_compress_type(unsigned long bio_flags)
183{
184	return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
185}
186
187struct extent_map_tree;
188
189typedef struct extent_map *(get_extent_t)(struct btrfs_inode *inode,
190					  struct page *page, size_t pg_offset,
191					  u64 start, u64 len);
192
193int try_release_extent_mapping(struct page *page, gfp_t mask);
194int try_release_extent_buffer(struct page *page);
195
196int extent_read_full_page(struct page *page, get_extent_t *get_extent,
197			  int mirror_num);
198int extent_write_full_page(struct page *page, struct writeback_control *wbc);
199int extent_write_locked_range(struct inode *inode, u64 start, u64 end,
200			      int mode);
201int extent_writepages(struct address_space *mapping,
202		      struct writeback_control *wbc);
203int btree_write_cache_pages(struct address_space *mapping,
204			    struct writeback_control *wbc);
205void extent_readahead(struct readahead_control *rac);
206int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
207		  u64 start, u64 len);
208void set_page_extent_mapped(struct page *page);
 
209
210struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
211					  u64 start);
212struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
213						  u64 start, unsigned long len);
214struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
215						u64 start);
216struct extent_buffer *btrfs_clone_extent_buffer(const struct extent_buffer *src);
217struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
218					 u64 start);
219void free_extent_buffer(struct extent_buffer *eb);
220void free_extent_buffer_stale(struct extent_buffer *eb);
221#define WAIT_NONE	0
222#define WAIT_COMPLETE	1
223#define WAIT_PAGE_LOCK	2
224int read_extent_buffer_pages(struct extent_buffer *eb, int wait,
225			     int mirror_num);
226void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
 
 
 
227
228static inline int num_extent_pages(const struct extent_buffer *eb)
229{
230	return (round_up(eb->start + eb->len, PAGE_SIZE) >> PAGE_SHIFT) -
231	       (eb->start >> PAGE_SHIFT);
 
 
 
 
 
 
232}
233
234static inline int extent_buffer_uptodate(const struct extent_buffer *eb)
235{
236	return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
237}
238
239int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
240			 unsigned long start, unsigned long len);
241void read_extent_buffer(const struct extent_buffer *eb, void *dst,
242			unsigned long start,
243			unsigned long len);
244int read_extent_buffer_to_user_nofault(const struct extent_buffer *eb,
245				       void __user *dst, unsigned long start,
246				       unsigned long len);
247void write_extent_buffer_fsid(const struct extent_buffer *eb, const void *src);
248void write_extent_buffer_chunk_tree_uuid(const struct extent_buffer *eb,
249		const void *src);
250void write_extent_buffer(const struct extent_buffer *eb, const void *src,
251			 unsigned long start, unsigned long len);
252void copy_extent_buffer_full(const struct extent_buffer *dst,
253			     const struct extent_buffer *src);
254void copy_extent_buffer(const struct extent_buffer *dst,
255			const struct extent_buffer *src,
256			unsigned long dst_offset, unsigned long src_offset,
257			unsigned long len);
258void memcpy_extent_buffer(const struct extent_buffer *dst,
259			  unsigned long dst_offset, unsigned long src_offset,
260			  unsigned long len);
261void memmove_extent_buffer(const struct extent_buffer *dst,
262			   unsigned long dst_offset, unsigned long src_offset,
263			   unsigned long len);
264void memzero_extent_buffer(const struct extent_buffer *eb, unsigned long start,
265			   unsigned long len);
266int extent_buffer_test_bit(const struct extent_buffer *eb, unsigned long start,
267			   unsigned long pos);
268void extent_buffer_bitmap_set(const struct extent_buffer *eb, unsigned long start,
269			      unsigned long pos, unsigned long len);
270void extent_buffer_bitmap_clear(const struct extent_buffer *eb,
271				unsigned long start, unsigned long pos,
272				unsigned long len);
273void clear_extent_buffer_dirty(const struct extent_buffer *eb);
274bool set_extent_buffer_dirty(struct extent_buffer *eb);
275void set_extent_buffer_uptodate(struct extent_buffer *eb);
276void clear_extent_buffer_uptodate(struct extent_buffer *eb);
277int extent_buffer_under_io(const struct extent_buffer *eb);
278void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
279void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
280void extent_clear_unlock_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
281				  struct page *locked_page,
282				  unsigned bits_to_clear,
283				  unsigned long page_ops);
284struct bio *btrfs_bio_alloc(u64 first_byte);
285struct bio *btrfs_io_bio_alloc(unsigned int nr_iovecs);
286struct bio *btrfs_bio_clone(struct bio *bio);
287struct bio *btrfs_bio_clone_partial(struct bio *orig, int offset, int size);
288
289struct btrfs_fs_info;
290struct btrfs_inode;
291
292int repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start,
293		      u64 length, u64 logical, struct page *page,
294		      unsigned int pg_offset, int mirror_num);
295void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
296int btrfs_repair_eb_io_failure(const struct extent_buffer *eb, int mirror_num);
297
298/*
299 * When IO fails, either with EIO or csum verification fails, we
300 * try other mirrors that might have a good copy of the data.  This
301 * io_failure_record is used to record state as we go through all the
302 * mirrors.  If another mirror has good data, the page is set up to date
303 * and things continue.  If a good mirror can't be found, the original
304 * bio end_io callback is called to indicate things have failed.
305 */
306struct io_failure_record {
 
 
 
 
 
307	struct page *page;
308	u64 start;
309	u64 len;
310	u64 logical;
311	unsigned long bio_flags;
312	int this_mirror;
313	int failed_mirror;
314	int in_validation;
315};
316
317
318blk_status_t btrfs_submit_read_repair(struct inode *inode,
319				      struct bio *failed_bio, u64 phy_offset,
320				      struct page *page, unsigned int pgoff,
321				      u64 start, u64 end, int failed_mirror,
322				      submit_bio_hook_t *submit_bio_hook);
323
324#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
325bool find_lock_delalloc_range(struct inode *inode,
326			     struct page *locked_page, u64 *start,
327			     u64 *end);
328#endif
329struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
330					       u64 start);
331
332#ifdef CONFIG_BTRFS_DEBUG
333void btrfs_extent_buffer_leak_debug_check(struct btrfs_fs_info *fs_info);
334#else
335#define btrfs_extent_buffer_leak_debug_check(fs_info)	do {} while (0)
336#endif
337
338#endif