[mirror_ubuntu-jammy-kernel.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,
};

/* these are flags for __process_pages_contig */
#define PAGE_UNLOCK		(1 << 0)
#define PAGE_CLEAR_DIRTY	(1 << 1)
#define PAGE_SET_WRITEBACK	(1 << 2)
#define PAGE_END_WRITEBACK	(1 << 3)
#define PAGE_SET_PRIVATE2	(1 << 4)
#define PAGE_SET_ERROR		(1 << 5)
#define PAGE_LOCK		(1 << 6)

/*
 * 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];
#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);
void set_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,
	34	};
b4ce94de	35
da2c7009	36	/* these are flags for __process_pages_contig */
c2790a2e JB	37	#define PAGE_UNLOCK (1 << 0)
	38	#define PAGE_CLEAR_DIRTY (1 << 1)
	39	#define PAGE_SET_WRITEBACK (1 << 2)
	40	#define PAGE_END_WRITEBACK (1 << 3)
	41	#define PAGE_SET_PRIVATE2 (1 << 4)
704de49d	42	#define PAGE_SET_ERROR (1 << 5)
da2c7009	43	#define PAGE_LOCK (1 << 6)
a791e35e	44
d1310b2e CM	45	/*
	46	* page->private values. Every page that is controlled by the extent
	47	* map has page->private set to one.
	48	*/
	49	#define EXTENT_PAGE_PRIVATE 1
d1310b2e	50
2fe1d551 OS	51	/*
	52	* The extent buffer bitmap operations are done with byte granularity instead of
	53	* word granularity for two reasons:
	54	* 1. The bitmaps must be little-endian on disk.
	55	* 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
	56	* single word in a bitmap may straddle two pages in the extent buffer.
	57	*/
	58	#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
	59	#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
	60	#define BITMAP_FIRST_BYTE_MASK(start) \
	61	((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
	62	#define BITMAP_LAST_BYTE_MASK(nbits) \
	63	(BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
	64
ea466794	65	struct btrfs_root;
6fc0ef68	66	struct btrfs_inode;
facc8a22	67	struct btrfs_io_bio;
47dc196a	68	struct io_failure_record;
9c7d3a54	69	struct extent_io_tree;
a758781d	70
77d5d689 OS	71	typedef blk_status_t (submit_bio_hook_t)(struct inode inode, struct bio bio,
	72	int mirror_num,
	73	unsigned long bio_flags);
	74
8896a08d	75	typedef blk_status_t (extent_submit_bio_start_t)(struct inode *inode,
1941b64b	76	struct bio *bio, u64 dio_file_offset);
a758781d	77
deb67895	78	#define INLINE_EXTENT_BUFFER_PAGES (BTRFS_MAX_METADATA_BLOCKSIZE / PAGE_SIZE)
d1310b2e CM	79	struct extent_buffer {
	80	u64 start;
	81	unsigned long len;
b4ce94de	82	unsigned long bflags;
f28491e0	83	struct btrfs_fs_info *fs_info;
3083ee2e	84	spinlock_t refs_lock;
727011e0	85	atomic_t refs;
0b32f4bb	86	atomic_t io_pages;
5cf1ab56	87	int read_mirror;
19fe0a8b	88	struct rcu_head rcu_head;
5b25f70f	89	pid_t lock_owner;
656f30db	90	/* >= 0 if eb belongs to a log tree, -1 otherwise */
dc516164 DS	91	s8 log_index;
	92
	93	struct rw_semaphore lock;
bd681513	94
b8dae313	95	struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
6d49ba1b ES	96	#ifdef CONFIG_BTRFS_DEBUG
	97	struct list_head leak_list;
	98	#endif
d1310b2e CM	99	};
d1310b2e CM	100
ac467772 QW	101	/*
	102	* Structure to record how many bytes and which ranges are set/cleared
	103	*/
	104	struct extent_changeset {
	105	/* How many bytes are set/cleared in this operation */
7bc329c1	106	unsigned int bytes_changed;
ac467772 QW	107
ac467772 QW	108	/* Changed ranges */
53d32359	109	struct ulist range_changed;
ac467772 QW	110	};
ac467772 QW	111
364ecf36 QW	112	static inline void extent_changeset_init(struct extent_changeset *changeset)
	113	{
	114	changeset->bytes_changed = 0;
	115	ulist_init(&changeset->range_changed);
	116	}
	117
	118	static inline struct extent_changeset *extent_changeset_alloc(void)
	119	{
	120	struct extent_changeset *ret;
	121
	122	ret = kmalloc(sizeof(*ret), GFP_KERNEL);
	123	if (!ret)
	124	return NULL;
	125
	126	extent_changeset_init(ret);
	127	return ret;
	128	}
	129
	130	static inline void extent_changeset_release(struct extent_changeset *changeset)
	131	{
	132	if (!changeset)
	133	return;
	134	changeset->bytes_changed = 0;
	135	ulist_release(&changeset->range_changed);
	136	}
	137
	138	static inline void extent_changeset_free(struct extent_changeset *changeset)
	139	{
	140	if (!changeset)
	141	return;
	142	extent_changeset_release(changeset);
	143	kfree(changeset);
	144	}
	145
261507a0 LZ	146	static inline void extent_set_compress_type(unsigned long *bio_flags,
	147	int compress_type)
	148	{
	149	*bio_flags \|= compress_type << EXTENT_BIO_FLAG_SHIFT;
	150	}
	151
	152	static inline int extent_compress_type(unsigned long bio_flags)
	153	{
	154	return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
	155	}
	156
d1310b2e CM	157	struct extent_map_tree;
d1310b2e CM	158
fc4f21b1	159	typedef struct extent_map (get_extent_t)(struct btrfs_inode inode,
39b07b5d OS	160	struct page *page, size_t pg_offset,
39b07b5d OS	161	u64 start, u64 len);
d1310b2e	162
477a30ba	163	int try_release_extent_mapping(struct page *page, gfp_t mask);
f7a52a40	164	int try_release_extent_buffer(struct page *page);
cd716d8f	165
c1be9c1a NB	166	int __must_check submit_one_bio(struct bio *bio, int mirror_num,
c1be9c1a NB	167	unsigned long bio_flags);
0f208812 NB	168	int btrfs_do_readpage(struct page page, struct extent_map *em_cached,
	169	struct bio *bio, unsigned long bio_flags,
	170	unsigned int read_flags, u64 *prev_em_start);
0a9b0e53	171	int extent_write_full_page(struct page page, struct writeback_control wbc);
5e3ee236	172	int extent_write_locked_range(struct inode *inode, u64 start, u64 end,
771ed689	173	int mode);
8ae225a8	174	int extent_writepages(struct address_space *mapping,
d1310b2e	175	struct writeback_control *wbc);
0b32f4bb JB	176	int btree_write_cache_pages(struct address_space *mapping,
0b32f4bb JB	177	struct writeback_control *wbc);
ba206a02	178	void extent_readahead(struct readahead_control *rac);
facee0a0	179	int extent_fiemap(struct btrfs_inode inode, struct fiemap_extent_info fieinfo,
bab16e21	180	u64 start, u64 len);
d1310b2e CM	181	void set_page_extent_mapped(struct page *page);
d1310b2e CM	182
f28491e0	183	struct extent_buffer alloc_extent_buffer(struct btrfs_fs_info fs_info,
3fbaf258	184	u64 start, u64 owner_root, int level);
0f331229 OS	185	struct extent_buffer __alloc_dummy_extent_buffer(struct btrfs_fs_info fs_info,
0f331229 OS	186	u64 start, unsigned long len);
3f556f78	187	struct extent_buffer alloc_dummy_extent_buffer(struct btrfs_fs_info fs_info,
da17066c	188	u64 start);
2b48966a	189	struct extent_buffer btrfs_clone_extent_buffer(const struct extent_buffer src);
f28491e0	190	struct extent_buffer find_extent_buffer(struct btrfs_fs_info fs_info,
452c75c3	191	u64 start);
d1310b2e	192	void free_extent_buffer(struct extent_buffer *eb);
3083ee2e	193	void free_extent_buffer_stale(struct extent_buffer *eb);
bb82ab88 AJ	194	#define WAIT_NONE 0
	195	#define WAIT_COMPLETE 1
	196	#define WAIT_PAGE_LOCK 2
c2ccfbc6	197	int read_extent_buffer_pages(struct extent_buffer *eb, int wait,
6af49dbd	198	int mirror_num);
fd8b2b61	199	void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
bfb484d9	200	void btrfs_readahead_tree_block(struct btrfs_fs_info *fs_info,
3fbaf258	201	u64 bytenr, u64 owner_root, u64 gen, int level);
bfb484d9	202	void btrfs_readahead_node_child(struct extent_buffer *node, int slot);
479ed9ab	203
cc5e31a4	204	static inline int num_extent_pages(const struct extent_buffer *eb)
479ed9ab	205	{
4a3dc938 QW	206	/*
	207	* For sectorsize == PAGE_SIZE case, since nodesize is always aligned to
	208	* sectorsize, it's just eb->len >> PAGE_SHIFT.
	209	*
	210	* For sectorsize < PAGE_SIZE case, we could have nodesize < PAGE_SIZE,
	211	* thus have to ensure we get at least one page.
	212	*/
	213	return (eb->len >> PAGE_SHIFT) ?: 1;
479ed9ab RD	214	}
479ed9ab RD	215
2b48966a	216	static inline int extent_buffer_uptodate(const struct extent_buffer *eb)
ba020491 AJ	217	{
	218	return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
	219	}
	220
1cbb1f45 JM	221	int memcmp_extent_buffer(const struct extent_buffer eb, const void ptrv,
	222	unsigned long start, unsigned long len);
	223	void read_extent_buffer(const struct extent_buffer eb, void dst,
d1310b2e CM	224	unsigned long start,
d1310b2e CM	225	unsigned long len);
a48b73ec JB	226	int read_extent_buffer_to_user_nofault(const struct extent_buffer *eb,
	227	void __user *dst, unsigned long start,
	228	unsigned long len);
2b48966a DS	229	void write_extent_buffer_fsid(const struct extent_buffer eb, const void src);
2b48966a DS	230	void write_extent_buffer_chunk_tree_uuid(const struct extent_buffer *eb,
f157bf76	231	const void *src);
2b48966a	232	void write_extent_buffer(const struct extent_buffer eb, const void src,
d1310b2e	233	unsigned long start, unsigned long len);
2b48966a DS	234	void copy_extent_buffer_full(const struct extent_buffer *dst,
	235	const struct extent_buffer *src);
	236	void copy_extent_buffer(const struct extent_buffer *dst,
	237	const struct extent_buffer *src,
d1310b2e CM	238	unsigned long dst_offset, unsigned long src_offset,
d1310b2e CM	239	unsigned long len);
2b48966a DS	240	void memcpy_extent_buffer(const struct extent_buffer *dst,
	241	unsigned long dst_offset, unsigned long src_offset,
	242	unsigned long len);
	243	void memmove_extent_buffer(const struct extent_buffer *dst,
	244	unsigned long dst_offset, unsigned long src_offset,
b159fa28	245	unsigned long len);
2b48966a	246	void memzero_extent_buffer(const struct extent_buffer *eb, unsigned long start,
b159fa28	247	unsigned long len);
2b48966a	248	int extent_buffer_test_bit(const struct extent_buffer *eb, unsigned long start,
3e1e8bb7	249	unsigned long pos);
2b48966a	250	void extent_buffer_bitmap_set(const struct extent_buffer *eb, unsigned long start,
3e1e8bb7	251	unsigned long pos, unsigned long len);
2b48966a DS	252	void extent_buffer_bitmap_clear(const struct extent_buffer *eb,
	253	unsigned long start, unsigned long pos,
	254	unsigned long len);
	255	void clear_extent_buffer_dirty(const struct extent_buffer *eb);
abb57ef3	256	bool set_extent_buffer_dirty(struct extent_buffer *eb);
09c25a8c	257	void set_extent_buffer_uptodate(struct extent_buffer *eb);
69ba3927	258	void clear_extent_buffer_uptodate(struct extent_buffer *eb);
2b48966a	259	int extent_buffer_under_io(const struct extent_buffer *eb);
bd1fa4f0	260	void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
f6311572	261	void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
ad7ff17b	262	void extent_clear_unlock_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
74e9194a	263	struct page *locked_page,
f97e27e9	264	u32 bits_to_clear, unsigned long page_ops);
e749af44	265	struct bio *btrfs_bio_alloc(u64 first_byte);
c5e4c3d7	266	struct bio *btrfs_io_bio_alloc(unsigned int nr_iovecs);
8b6c1d56	267	struct bio btrfs_bio_clone(struct bio bio);
e477094f	268	struct bio btrfs_bio_clone_partial(struct bio orig, int offset, int size);
4a54c8c1	269
3ec706c8	270	struct btrfs_fs_info;
9d4f7f8a	271	struct btrfs_inode;
4a54c8c1	272
6ec656bc JB	273	int repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start,
	274	u64 length, u64 logical, struct page *page,
	275	unsigned int pg_offset, int mirror_num);
b5227c07	276	void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
2b48966a	277	int btrfs_repair_eb_io_failure(const struct extent_buffer *eb, int mirror_num);
2fe6303e MX	278
	279	/*
	280	* When IO fails, either with EIO or csum verification fails, we
	281	* try other mirrors that might have a good copy of the data. This
	282	* io_failure_record is used to record state as we go through all the
	283	* mirrors. If another mirror has good data, the page is set up to date
	284	* and things continue. If a good mirror can't be found, the original
	285	* bio end_io callback is called to indicate things have failed.
	286	*/
	287	struct io_failure_record {
	288	struct page *page;
	289	u64 start;
	290	u64 len;
	291	u64 logical;
	292	unsigned long bio_flags;
	293	int this_mirror;
	294	int failed_mirror;
	295	int in_validation;
	296	};
	297
4ac1f4ac	298
77d5d689	299	blk_status_t btrfs_submit_read_repair(struct inode *inode,
7ffd27e3	300	struct bio *failed_bio, u32 bio_offset,
77d5d689 OS	301	struct page *page, unsigned int pgoff,
	302	u64 start, u64 end, int failed_mirror,
	303	submit_bio_hook_t *submit_bio_hook);
	304
294e30fe	305	#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
9978059b	306	bool find_lock_delalloc_range(struct inode *inode,
ce9f967f JT	307	struct page locked_page, u64 start,
ce9f967f JT	308	u64 *end);
0d4cf4e6	309	#endif
faa2dbf0	310	struct extent_buffer alloc_test_extent_buffer(struct btrfs_fs_info fs_info,
da17066c	311	u64 start);
3fd63727 JB	312
	313	#ifdef CONFIG_BTRFS_DEBUG
	314	void btrfs_extent_buffer_leak_debug_check(struct btrfs_fs_info *fs_info);
	315	#else
	316	#define btrfs_extent_buffer_leak_debug_check(fs_info) do {} while (0)
	317	#endif
	318
294e30fe	319	#endif