[linux.git] / fs / btrfs / extent_io.h

/* SPDX-License-Identifier: GPL-2.0 */

#ifndef BTRFS_EXTENT_IO_H
#define BTRFS_EXTENT_IO_H

#include <linux/rbtree.h>
#include <linux/refcount.h>
#include <linux/fiemap.h>
#include <linux/btrfs_tree.h>
#include "ulist.h"

/*
 * flags for bio submission. The high bits indicate the compression
 * type for this bio
 */
#define EXTENT_BIO_COMPRESSED 1
#define EXTENT_BIO_FLAG_SHIFT 16

enum {
	EXTENT_BUFFER_UPTODATE,
	EXTENT_BUFFER_DIRTY,
	EXTENT_BUFFER_CORRUPT,
	/* this got triggered by readahead */
	EXTENT_BUFFER_READAHEAD,
	EXTENT_BUFFER_TREE_REF,
	EXTENT_BUFFER_STALE,
	EXTENT_BUFFER_WRITEBACK,
	/* read IO error */
	EXTENT_BUFFER_READ_ERR,
	EXTENT_BUFFER_UNMAPPED,
	EXTENT_BUFFER_IN_TREE,
	/* write IO error */
	EXTENT_BUFFER_WRITE_ERR,
	EXTENT_BUFFER_NO_CHECK,
};

/* these are flags for __process_pages_contig */
#define PAGE_UNLOCK		(1 << 0)
/* Page starts writeback, clear dirty bit and set writeback bit */
#define PAGE_START_WRITEBACK	(1 << 1)
#define PAGE_END_WRITEBACK	(1 << 2)
#define PAGE_SET_PRIVATE2	(1 << 3)
#define PAGE_SET_ERROR		(1 << 4)
#define PAGE_LOCK		(1 << 5)

/*
 * page->private values.  Every page that is controlled by the extent
 * map has page->private set to one.
 */
#define EXTENT_PAGE_PRIVATE 1

/*
 * The extent buffer bitmap operations are done with byte granularity instead of
 * word granularity for two reasons:
 * 1. The bitmaps must be little-endian on disk.
 * 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
 *    single word in a bitmap may straddle two pages in the extent buffer.
 */
#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
#define BITMAP_FIRST_BYTE_MASK(start) \
	((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
#define BITMAP_LAST_BYTE_MASK(nbits) \
	(BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))

struct btrfs_root;
struct btrfs_inode;
struct btrfs_io_bio;
struct io_failure_record;
struct extent_io_tree;

typedef blk_status_t (submit_bio_hook_t)(struct inode *inode, struct bio *bio,
					 int mirror_num,
					 unsigned long bio_flags);

typedef blk_status_t (extent_submit_bio_start_t)(struct inode *inode,
		struct bio *bio, u64 dio_file_offset);

#define INLINE_EXTENT_BUFFER_PAGES     (BTRFS_MAX_METADATA_BLOCKSIZE / PAGE_SIZE)
struct extent_buffer {
	u64 start;
	unsigned long len;
	unsigned long bflags;
	struct btrfs_fs_info *fs_info;
	spinlock_t refs_lock;
	atomic_t refs;
	atomic_t io_pages;
	int read_mirror;
	struct rcu_head rcu_head;
	pid_t lock_owner;
	/* >= 0 if eb belongs to a log tree, -1 otherwise */
	s8 log_index;

	struct rw_semaphore lock;

	struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
	struct list_head release_list;
#ifdef CONFIG_BTRFS_DEBUG
	struct list_head leak_list;
#endif
};

/*
 * Structure to record how many bytes and which ranges are set/cleared
 */
struct extent_changeset {
	/* How many bytes are set/cleared in this operation */
	unsigned int bytes_changed;

	/* Changed ranges */
	struct ulist range_changed;
};

static inline void extent_changeset_init(struct extent_changeset *changeset)
{
	changeset->bytes_changed = 0;
	ulist_init(&changeset->range_changed);
}

static inline struct extent_changeset *extent_changeset_alloc(void)
{
	struct extent_changeset *ret;

	ret = kmalloc(sizeof(*ret), GFP_KERNEL);
	if (!ret)
		return NULL;

	extent_changeset_init(ret);
	return ret;
}

static inline void extent_changeset_release(struct extent_changeset *changeset)
{
	if (!changeset)
		return;
	changeset->bytes_changed = 0;
	ulist_release(&changeset->range_changed);
}

static inline void extent_changeset_free(struct extent_changeset *changeset)
{
	if (!changeset)
		return;
	extent_changeset_release(changeset);
	kfree(changeset);
}

static inline void extent_set_compress_type(unsigned long *bio_flags,
					    int compress_type)
{
	*bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
}

static inline int extent_compress_type(unsigned long bio_flags)
{
	return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
}

struct extent_map_tree;

typedef struct extent_map *(get_extent_t)(struct btrfs_inode *inode,
					  struct page *page, size_t pg_offset,
					  u64 start, u64 len);

int try_release_extent_mapping(struct page *page, gfp_t mask);
int try_release_extent_buffer(struct page *page);

int __must_check submit_one_bio(struct bio *bio, int mirror_num,
				unsigned long bio_flags);
int btrfs_do_readpage(struct page *page, struct extent_map **em_cached,
		      struct bio **bio, unsigned long *bio_flags,
		      unsigned int read_flags, u64 *prev_em_start);
int extent_write_full_page(struct page *page, struct writeback_control *wbc);
int extent_write_locked_range(struct inode *inode, u64 start, u64 end,
			      int mode);
int extent_writepages(struct address_space *mapping,
		      struct writeback_control *wbc);
int btree_write_cache_pages(struct address_space *mapping,
			    struct writeback_control *wbc);
void extent_readahead(struct readahead_control *rac);
int extent_fiemap(struct btrfs_inode *inode, struct fiemap_extent_info *fieinfo,
		  u64 start, u64 len);
int set_page_extent_mapped(struct page *page);
void clear_page_extent_mapped(struct page *page);

struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
					  u64 start, u64 owner_root, int level);
struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
						  u64 start, unsigned long len);
struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
						u64 start);
struct extent_buffer *btrfs_clone_extent_buffer(const struct extent_buffer *src);
struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
					 u64 start);
void free_extent_buffer(struct extent_buffer *eb);
void free_extent_buffer_stale(struct extent_buffer *eb);
#define WAIT_NONE	0
#define WAIT_COMPLETE	1
#define WAIT_PAGE_LOCK	2
int read_extent_buffer_pages(struct extent_buffer *eb, int wait,
			     int mirror_num);
void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
void btrfs_readahead_tree_block(struct btrfs_fs_info *fs_info,
				u64 bytenr, u64 owner_root, u64 gen, int level);
void btrfs_readahead_node_child(struct extent_buffer *node, int slot);

static inline int num_extent_pages(const struct extent_buffer *eb)
{
	/*
	 * For sectorsize == PAGE_SIZE case, since nodesize is always aligned to
	 * sectorsize, it's just eb->len >> PAGE_SHIFT.
	 *
	 * For sectorsize < PAGE_SIZE case, we could have nodesize < PAGE_SIZE,
	 * thus have to ensure we get at least one page.
	 */
	return (eb->len >> PAGE_SHIFT) ?: 1;
}

static inline int extent_buffer_uptodate(const struct extent_buffer *eb)
{
	return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
}

int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
			 unsigned long start, unsigned long len);
void read_extent_buffer(const struct extent_buffer *eb, void *dst,
			unsigned long start,
			unsigned long len);
int read_extent_buffer_to_user_nofault(const struct extent_buffer *eb,
				       void __user *dst, unsigned long start,
				       unsigned long len);
void write_extent_buffer_fsid(const struct extent_buffer *eb, const void *src);
void write_extent_buffer_chunk_tree_uuid(const struct extent_buffer *eb,
		const void *src);
void write_extent_buffer(const struct extent_buffer *eb, const void *src,
			 unsigned long start, unsigned long len);
void copy_extent_buffer_full(const struct extent_buffer *dst,
			     const struct extent_buffer *src);
void copy_extent_buffer(const struct extent_buffer *dst,
			const struct extent_buffer *src,
			unsigned long dst_offset, unsigned long src_offset,
			unsigned long len);
void memcpy_extent_buffer(const struct extent_buffer *dst,
			  unsigned long dst_offset, unsigned long src_offset,
			  unsigned long len);
void memmove_extent_buffer(const struct extent_buffer *dst,
			   unsigned long dst_offset, unsigned long src_offset,
			   unsigned long len);
void memzero_extent_buffer(const struct extent_buffer *eb, unsigned long start,
			   unsigned long len);
int extent_buffer_test_bit(const struct extent_buffer *eb, unsigned long start,
			   unsigned long pos);
void extent_buffer_bitmap_set(const struct extent_buffer *eb, unsigned long start,
			      unsigned long pos, unsigned long len);
void extent_buffer_bitmap_clear(const struct extent_buffer *eb,
				unsigned long start, unsigned long pos,
				unsigned long len);
void clear_extent_buffer_dirty(const struct extent_buffer *eb);
bool set_extent_buffer_dirty(struct extent_buffer *eb);
void set_extent_buffer_uptodate(struct extent_buffer *eb);
void clear_extent_buffer_uptodate(struct extent_buffer *eb);
int extent_buffer_under_io(const struct extent_buffer *eb);
void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
void extent_clear_unlock_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
				  struct page *locked_page,
				  u32 bits_to_clear, unsigned long page_ops);
struct bio *btrfs_bio_alloc(u64 first_byte);
struct bio *btrfs_io_bio_alloc(unsigned int nr_iovecs);
struct bio *btrfs_bio_clone(struct bio *bio);
struct bio *btrfs_bio_clone_partial(struct bio *orig, int offset, int size);

struct btrfs_fs_info;
struct btrfs_inode;

int repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start,
		      u64 length, u64 logical, struct page *page,
		      unsigned int pg_offset, int mirror_num);
void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
int btrfs_repair_eb_io_failure(const struct extent_buffer *eb, int mirror_num);

/*
 * When IO fails, either with EIO or csum verification fails, we
 * try other mirrors that might have a good copy of the data.  This
 * io_failure_record is used to record state as we go through all the
 * mirrors.  If another mirror has good data, the page is set up to date
 * and things continue.  If a good mirror can't be found, the original
 * bio end_io callback is called to indicate things have failed.
 */
struct io_failure_record {
	struct page *page;
	u64 start;
	u64 len;
	u64 logical;
	unsigned long bio_flags;
	int this_mirror;
	int failed_mirror;
	int in_validation;
};


blk_status_t btrfs_submit_read_repair(struct inode *inode,
				      struct bio *failed_bio, u32 bio_offset,
				      struct page *page, unsigned int pgoff,
				      u64 start, u64 end, int failed_mirror,
				      submit_bio_hook_t *submit_bio_hook);

#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
bool find_lock_delalloc_range(struct inode *inode,
			     struct page *locked_page, u64 *start,
			     u64 *end);
#endif
struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
					       u64 start);

#ifdef CONFIG_BTRFS_DEBUG
void btrfs_extent_buffer_leak_debug_check(struct btrfs_fs_info *fs_info);
#else
#define btrfs_extent_buffer_leak_debug_check(fs_info)	do {} while (0)
#endif

#endif
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
9888c340 DS	2
	3	#ifndef BTRFS_EXTENT_IO_H
	4	#define BTRFS_EXTENT_IO_H
d1310b2e CM	5
d1310b2e CM	6	#include <linux/rbtree.h>
b7ac31b7	7	#include <linux/refcount.h>
10c5db28	8	#include <linux/fiemap.h>
deb67895	9	#include <linux/btrfs_tree.h>
ac467772	10	#include "ulist.h"
d1310b2e	11
261507a0 LZ	12	/*
	13	* flags for bio submission. The high bits indicate the compression
	14	* type for this bio
	15	*/
c8b97818	16	#define EXTENT_BIO_COMPRESSED 1
261507a0	17	#define EXTENT_BIO_FLAG_SHIFT 16
c8b97818	18
80cb3836 DS	19	enum {
	20	EXTENT_BUFFER_UPTODATE,
	21	EXTENT_BUFFER_DIRTY,
	22	EXTENT_BUFFER_CORRUPT,
	23	/* this got triggered by readahead */
	24	EXTENT_BUFFER_READAHEAD,
	25	EXTENT_BUFFER_TREE_REF,
	26	EXTENT_BUFFER_STALE,
	27	EXTENT_BUFFER_WRITEBACK,
	28	/* read IO error */
	29	EXTENT_BUFFER_READ_ERR,
	30	EXTENT_BUFFER_UNMAPPED,
	31	EXTENT_BUFFER_IN_TREE,
	32	/* write IO error */
	33	EXTENT_BUFFER_WRITE_ERR,
d3575156	34	EXTENT_BUFFER_NO_CHECK,
80cb3836	35	};
b4ce94de	36
da2c7009	37	/* these are flags for __process_pages_contig */
c2790a2e	38	#define PAGE_UNLOCK (1 << 0)
6869b0a8 QW	39	/* Page starts writeback, clear dirty bit and set writeback bit */
	40	#define PAGE_START_WRITEBACK (1 << 1)
	41	#define PAGE_END_WRITEBACK (1 << 2)
	42	#define PAGE_SET_PRIVATE2 (1 << 3)
	43	#define PAGE_SET_ERROR (1 << 4)
	44	#define PAGE_LOCK (1 << 5)
a791e35e	45
d1310b2e CM	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
d1310b2e	51
2fe1d551 OS	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
ea466794	66	struct btrfs_root;
6fc0ef68	67	struct btrfs_inode;
facc8a22	68	struct btrfs_io_bio;
47dc196a	69	struct io_failure_record;
9c7d3a54	70	struct extent_io_tree;
a758781d	71
77d5d689 OS	72	typedef blk_status_t (submit_bio_hook_t)(struct inode inode, struct bio bio,
	73	int mirror_num,
	74	unsigned long bio_flags);
	75
8896a08d	76	typedef blk_status_t (extent_submit_bio_start_t)(struct inode *inode,
1941b64b	77	struct bio *bio, u64 dio_file_offset);
a758781d	78
deb67895	79	#define INLINE_EXTENT_BUFFER_PAGES (BTRFS_MAX_METADATA_BLOCKSIZE / PAGE_SIZE)
d1310b2e CM	80	struct extent_buffer {
	81	u64 start;
	82	unsigned long len;
b4ce94de	83	unsigned long bflags;
f28491e0	84	struct btrfs_fs_info *fs_info;
3083ee2e	85	spinlock_t refs_lock;
727011e0	86	atomic_t refs;
0b32f4bb	87	atomic_t io_pages;
5cf1ab56	88	int read_mirror;
19fe0a8b	89	struct rcu_head rcu_head;
5b25f70f	90	pid_t lock_owner;
656f30db	91	/* >= 0 if eb belongs to a log tree, -1 otherwise */
dc516164 DS	92	s8 log_index;
	93
	94	struct rw_semaphore lock;
bd681513	95
b8dae313	96	struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
d3575156	97	struct list_head release_list;
6d49ba1b ES	98	#ifdef CONFIG_BTRFS_DEBUG
	99	struct list_head leak_list;
	100	#endif
d1310b2e CM	101	};
d1310b2e CM	102
ac467772 QW	103	/*
	104	* Structure to record how many bytes and which ranges are set/cleared
	105	*/
	106	struct extent_changeset {
	107	/* How many bytes are set/cleared in this operation */
7bc329c1	108	unsigned int bytes_changed;
ac467772 QW	109
ac467772 QW	110	/* Changed ranges */
53d32359	111	struct ulist range_changed;
ac467772 QW	112	};
ac467772 QW	113
364ecf36 QW	114	static inline void extent_changeset_init(struct extent_changeset *changeset)
	115	{
	116	changeset->bytes_changed = 0;
	117	ulist_init(&changeset->range_changed);
	118	}
	119
	120	static inline struct extent_changeset *extent_changeset_alloc(void)
	121	{
	122	struct extent_changeset *ret;
	123
	124	ret = kmalloc(sizeof(*ret), GFP_KERNEL);
	125	if (!ret)
	126	return NULL;
	127
	128	extent_changeset_init(ret);
	129	return ret;
	130	}
	131
	132	static inline void extent_changeset_release(struct extent_changeset *changeset)
	133	{
	134	if (!changeset)
	135	return;
	136	changeset->bytes_changed = 0;
	137	ulist_release(&changeset->range_changed);
	138	}
	139
	140	static inline void extent_changeset_free(struct extent_changeset *changeset)
	141	{
	142	if (!changeset)
	143	return;
	144	extent_changeset_release(changeset);
	145	kfree(changeset);
	146	}
	147
261507a0 LZ	148	static inline void extent_set_compress_type(unsigned long *bio_flags,
	149	int compress_type)
	150	{
	151	*bio_flags \|= compress_type << EXTENT_BIO_FLAG_SHIFT;
	152	}
	153
	154	static inline int extent_compress_type(unsigned long bio_flags)
	155	{
	156	return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
	157	}
	158
d1310b2e CM	159	struct extent_map_tree;
d1310b2e CM	160
fc4f21b1	161	typedef struct extent_map (get_extent_t)(struct btrfs_inode inode,
39b07b5d OS	162	struct page *page, size_t pg_offset,
39b07b5d OS	163	u64 start, u64 len);
d1310b2e	164
477a30ba	165	int try_release_extent_mapping(struct page *page, gfp_t mask);
f7a52a40	166	int try_release_extent_buffer(struct page *page);
cd716d8f	167
c1be9c1a NB	168	int __must_check submit_one_bio(struct bio *bio, int mirror_num,
c1be9c1a NB	169	unsigned long bio_flags);
0f208812 NB	170	int btrfs_do_readpage(struct page page, struct extent_map *em_cached,
	171	struct bio *bio, unsigned long bio_flags,
	172	unsigned int read_flags, u64 *prev_em_start);
0a9b0e53	173	int extent_write_full_page(struct page page, struct writeback_control wbc);
5e3ee236	174	int extent_write_locked_range(struct inode *inode, u64 start, u64 end,
771ed689	175	int mode);
8ae225a8	176	int extent_writepages(struct address_space *mapping,
d1310b2e	177	struct writeback_control *wbc);
0b32f4bb JB	178	int btree_write_cache_pages(struct address_space *mapping,
0b32f4bb JB	179	struct writeback_control *wbc);
ba206a02	180	void extent_readahead(struct readahead_control *rac);
facee0a0	181	int extent_fiemap(struct btrfs_inode inode, struct fiemap_extent_info fieinfo,
bab16e21	182	u64 start, u64 len);
32443de3 QW	183	int set_page_extent_mapped(struct page *page);
32443de3 QW	184	void clear_page_extent_mapped(struct page *page);
d1310b2e	185
f28491e0	186	struct extent_buffer alloc_extent_buffer(struct btrfs_fs_info fs_info,
3fbaf258	187	u64 start, u64 owner_root, int level);
0f331229 OS	188	struct extent_buffer __alloc_dummy_extent_buffer(struct btrfs_fs_info fs_info,
0f331229 OS	189	u64 start, unsigned long len);
3f556f78	190	struct extent_buffer alloc_dummy_extent_buffer(struct btrfs_fs_info fs_info,
da17066c	191	u64 start);
2b48966a	192	struct extent_buffer btrfs_clone_extent_buffer(const struct extent_buffer src);
f28491e0	193	struct extent_buffer find_extent_buffer(struct btrfs_fs_info fs_info,
452c75c3	194	u64 start);
d1310b2e	195	void free_extent_buffer(struct extent_buffer *eb);
3083ee2e	196	void free_extent_buffer_stale(struct extent_buffer *eb);
bb82ab88 AJ	197	#define WAIT_NONE 0
	198	#define WAIT_COMPLETE 1
	199	#define WAIT_PAGE_LOCK 2
c2ccfbc6	200	int read_extent_buffer_pages(struct extent_buffer *eb, int wait,
6af49dbd	201	int mirror_num);
fd8b2b61	202	void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
bfb484d9	203	void btrfs_readahead_tree_block(struct btrfs_fs_info *fs_info,
3fbaf258	204	u64 bytenr, u64 owner_root, u64 gen, int level);
bfb484d9	205	void btrfs_readahead_node_child(struct extent_buffer *node, int slot);
479ed9ab	206
cc5e31a4	207	static inline int num_extent_pages(const struct extent_buffer *eb)
479ed9ab	208	{
4a3dc938 QW	209	/*
	210	* For sectorsize == PAGE_SIZE case, since nodesize is always aligned to
	211	* sectorsize, it's just eb->len >> PAGE_SHIFT.
	212	*
	213	* For sectorsize < PAGE_SIZE case, we could have nodesize < PAGE_SIZE,
	214	* thus have to ensure we get at least one page.
	215	*/
	216	return (eb->len >> PAGE_SHIFT) ?: 1;
479ed9ab RD	217	}
479ed9ab RD	218
2b48966a	219	static inline int extent_buffer_uptodate(const struct extent_buffer *eb)
ba020491 AJ	220	{
	221	return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
	222	}
	223
1cbb1f45 JM	224	int memcmp_extent_buffer(const struct extent_buffer eb, const void ptrv,
	225	unsigned long start, unsigned long len);
	226	void read_extent_buffer(const struct extent_buffer eb, void dst,
d1310b2e CM	227	unsigned long start,
d1310b2e CM	228	unsigned long len);
a48b73ec JB	229	int read_extent_buffer_to_user_nofault(const struct extent_buffer *eb,
	230	void __user *dst, unsigned long start,
	231	unsigned long len);
2b48966a DS	232	void write_extent_buffer_fsid(const struct extent_buffer eb, const void src);
2b48966a DS	233	void write_extent_buffer_chunk_tree_uuid(const struct extent_buffer *eb,
f157bf76	234	const void *src);
2b48966a	235	void write_extent_buffer(const struct extent_buffer eb, const void src,
d1310b2e	236	unsigned long start, unsigned long len);
2b48966a DS	237	void copy_extent_buffer_full(const struct extent_buffer *dst,
	238	const struct extent_buffer *src);
	239	void copy_extent_buffer(const struct extent_buffer *dst,
	240	const struct extent_buffer *src,
d1310b2e CM	241	unsigned long dst_offset, unsigned long src_offset,
d1310b2e CM	242	unsigned long len);
2b48966a DS	243	void memcpy_extent_buffer(const struct extent_buffer *dst,
	244	unsigned long dst_offset, unsigned long src_offset,
	245	unsigned long len);
	246	void memmove_extent_buffer(const struct extent_buffer *dst,
	247	unsigned long dst_offset, unsigned long src_offset,
b159fa28	248	unsigned long len);
2b48966a	249	void memzero_extent_buffer(const struct extent_buffer *eb, unsigned long start,
b159fa28	250	unsigned long len);
2b48966a	251	int extent_buffer_test_bit(const struct extent_buffer *eb, unsigned long start,
3e1e8bb7	252	unsigned long pos);
2b48966a	253	void extent_buffer_bitmap_set(const struct extent_buffer *eb, unsigned long start,
3e1e8bb7	254	unsigned long pos, unsigned long len);
2b48966a DS	255	void extent_buffer_bitmap_clear(const struct extent_buffer *eb,
	256	unsigned long start, unsigned long pos,
	257	unsigned long len);
	258	void clear_extent_buffer_dirty(const struct extent_buffer *eb);
abb57ef3	259	bool set_extent_buffer_dirty(struct extent_buffer *eb);
09c25a8c	260	void set_extent_buffer_uptodate(struct extent_buffer *eb);
69ba3927	261	void clear_extent_buffer_uptodate(struct extent_buffer *eb);
2b48966a	262	int extent_buffer_under_io(const struct extent_buffer *eb);
bd1fa4f0	263	void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
f6311572	264	void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
ad7ff17b	265	void extent_clear_unlock_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
74e9194a	266	struct page *locked_page,
f97e27e9	267	u32 bits_to_clear, unsigned long page_ops);
e749af44	268	struct bio *btrfs_bio_alloc(u64 first_byte);
c5e4c3d7	269	struct bio *btrfs_io_bio_alloc(unsigned int nr_iovecs);
8b6c1d56	270	struct bio btrfs_bio_clone(struct bio bio);
e477094f	271	struct bio btrfs_bio_clone_partial(struct bio orig, int offset, int size);
4a54c8c1	272
3ec706c8	273	struct btrfs_fs_info;
9d4f7f8a	274	struct btrfs_inode;
4a54c8c1	275
6ec656bc JB	276	int repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start,
	277	u64 length, u64 logical, struct page *page,
	278	unsigned int pg_offset, int mirror_num);
b5227c07	279	void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
2b48966a	280	int btrfs_repair_eb_io_failure(const struct extent_buffer *eb, int mirror_num);
2fe6303e MX	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 page 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	*/
	290	struct io_failure_record {
	291	struct page *page;
	292	u64 start;
	293	u64 len;
	294	u64 logical;
	295	unsigned long bio_flags;
	296	int this_mirror;
	297	int failed_mirror;
	298	int in_validation;
	299	};
	300
4ac1f4ac	301
77d5d689	302	blk_status_t btrfs_submit_read_repair(struct inode *inode,
7ffd27e3	303	struct bio *failed_bio, u32 bio_offset,
77d5d689 OS	304	struct page *page, unsigned int pgoff,
	305	u64 start, u64 end, int failed_mirror,
	306	submit_bio_hook_t *submit_bio_hook);
	307
294e30fe	308	#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
9978059b	309	bool find_lock_delalloc_range(struct inode *inode,
ce9f967f JT	310	struct page locked_page, u64 start,
ce9f967f JT	311	u64 *end);
0d4cf4e6	312	#endif
faa2dbf0	313	struct extent_buffer alloc_test_extent_buffer(struct btrfs_fs_info fs_info,
da17066c	314	u64 start);
3fd63727 JB	315
	316	#ifdef CONFIG_BTRFS_DEBUG
	317	void btrfs_extent_buffer_leak_debug_check(struct btrfs_fs_info *fs_info);
	318	#else
	319	#define btrfs_extent_buffer_leak_debug_check(fs_info) do {} while (0)
	320	#endif
	321
294e30fe	322	#endif