[linux-2.6-block.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 "compression.h"
#include "ulist.h"
#include "misc.h"

struct btrfs_trans_handle;

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,
	/* Indicate that extent buffer pages a being read */
	EXTENT_BUFFER_READING,
};

/* these are flags for __process_pages_contig */
enum {
	ENUM_BIT(PAGE_UNLOCK),
	/* Page starts writeback, clear dirty bit and set writeback bit */
	ENUM_BIT(PAGE_START_WRITEBACK),
	ENUM_BIT(PAGE_END_WRITEBACK),
	ENUM_BIT(PAGE_SET_ORDERED),
};

/*
 * 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_fs_info;
struct extent_io_tree;
struct btrfs_tree_parent_check;

int __init extent_buffer_init_cachep(void);
void __cold extent_buffer_free_cachep(void);

#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;
	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
};

/*
 * Get the correct offset inside the page of extent buffer.
 *
 * @eb:		target extent buffer
 * @start:	offset inside the extent buffer
 *
 * Will handle both sectorsize == PAGE_SIZE and sectorsize < PAGE_SIZE cases.
 */
static inline size_t get_eb_offset_in_page(const struct extent_buffer *eb,
					   unsigned long offset)
{
	/*
	 * For sectorsize == PAGE_SIZE case, eb->start will always be aligned
	 * to PAGE_SIZE, thus adding it won't cause any difference.
	 *
	 * For sectorsize < PAGE_SIZE, we must only read the data that belongs
	 * to the eb, thus we have to take the eb->start into consideration.
	 */
	return offset_in_page(offset + eb->start);
}

static inline unsigned long get_eb_page_index(unsigned long offset)
{
	/*
	 * For sectorsize == PAGE_SIZE case, plain >> PAGE_SHIFT is enough.
	 *
	 * For sectorsize < PAGE_SIZE case, we only support 64K PAGE_SIZE,
	 * and have ensured that all tree blocks are contained in one page,
	 * thus we always get index == 0.
	 */
	return offset >> PAGE_SHIFT;
}

/*
 * Structure to record how many bytes and which ranges are set/cleared
 */
struct extent_changeset {
	/* How many bytes are set/cleared in this operation */
	u64 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);
}

struct extent_map_tree;

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

int btrfs_read_folio(struct file *file, struct folio *folio);
void extent_write_locked_range(struct inode *inode, struct page *locked_page,
			       u64 start, u64 end, struct writeback_control *wbc,
			       bool pages_dirty);
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,
			     struct btrfs_tree_parent_check *parent_check);
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(const struct extent_buffer *eb, const void *src,
			 unsigned long start, unsigned long len);

static inline void write_extent_buffer_chunk_tree_uuid(
		const struct extent_buffer *eb, const void *chunk_tree_uuid)
{
	write_extent_buffer(eb, chunk_tree_uuid,
			    offsetof(struct btrfs_header, chunk_tree_uuid),
			    BTRFS_FSID_SIZE);
}

static inline void write_extent_buffer_fsid(const struct extent_buffer *eb,
					    const void *fsid)
{
	write_extent_buffer(eb, fsid, offsetof(struct btrfs_header, fsid),
			    BTRFS_FSID_SIZE);
}

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 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);
void extent_range_clear_dirty_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);
int extent_invalidate_folio(struct extent_io_tree *tree,
			    struct folio *folio, size_t offset);
void btrfs_clear_buffer_dirty(struct btrfs_trans_handle *trans,
			      struct extent_buffer *buf);

int btrfs_alloc_page_array(unsigned int nr_pages, struct page **page_array);

#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>
0ff40013	10	#include "compression.h"
ac467772	11	#include "ulist.h"
fd8d2951	12	#include "misc.h"
d1310b2e	13
98c8d683 JB	14	struct btrfs_trans_handle;
98c8d683 JB	15
80cb3836 DS	16	enum {
	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,
d3575156	31	EXTENT_BUFFER_NO_CHECK,
d7172f52 CH	32	/* Indicate that extent buffer pages a being read */
d7172f52 CH	33	EXTENT_BUFFER_READING,
80cb3836	34	};
b4ce94de	35
da2c7009	36	/* these are flags for __process_pages_contig */
fd8d2951 DS	37	enum {
	38	ENUM_BIT(PAGE_UNLOCK),
	39	/* Page starts writeback, clear dirty bit and set writeback bit */
	40	ENUM_BIT(PAGE_START_WRITEBACK),
	41	ENUM_BIT(PAGE_END_WRITEBACK),
	42	ENUM_BIT(PAGE_SET_ORDERED),
fd8d2951	43	};
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;
183ebab7	67	struct btrfs_fs_info;
9c7d3a54	68	struct extent_io_tree;
947a6299	69	struct btrfs_tree_parent_check;
a758781d	70
a62a3bd9 JB	71	int __init extent_buffer_init_cachep(void);
	72	void __cold extent_buffer_free_cachep(void);
	73
deb67895	74	#define INLINE_EXTENT_BUFFER_PAGES (BTRFS_MAX_METADATA_BLOCKSIZE / PAGE_SIZE)
d1310b2e CM	75	struct extent_buffer {
	76	u64 start;
	77	unsigned long len;
b4ce94de	78	unsigned long bflags;
f28491e0	79	struct btrfs_fs_info *fs_info;
3083ee2e	80	spinlock_t refs_lock;
727011e0	81	atomic_t refs;
5cf1ab56	82	int read_mirror;
19fe0a8b	83	struct rcu_head rcu_head;
5b25f70f	84	pid_t lock_owner;
656f30db	85	/* >= 0 if eb belongs to a log tree, -1 otherwise */
dc516164 DS	86	s8 log_index;
	87
	88	struct rw_semaphore lock;
bd681513	89
b8dae313	90	struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
6d49ba1b ES	91	#ifdef CONFIG_BTRFS_DEBUG
	92	struct list_head leak_list;
	93	#endif
d1310b2e CM	94	};
d1310b2e CM	95
9b48adda JB	96	/*
	97	* Get the correct offset inside the page of extent buffer.
	98	*
	99	* @eb: target extent buffer
	100	* @start: offset inside the extent buffer
	101	*
	102	* Will handle both sectorsize == PAGE_SIZE and sectorsize < PAGE_SIZE cases.
	103	*/
	104	static inline size_t get_eb_offset_in_page(const struct extent_buffer *eb,
	105	unsigned long offset)
	106	{
	107	/*
	108	* For sectorsize == PAGE_SIZE case, eb->start will always be aligned
	109	* to PAGE_SIZE, thus adding it won't cause any difference.
	110	*
	111	* For sectorsize < PAGE_SIZE, we must only read the data that belongs
	112	* to the eb, thus we have to take the eb->start into consideration.
	113	*/
	114	return offset_in_page(offset + eb->start);
	115	}
	116
	117	static inline unsigned long get_eb_page_index(unsigned long offset)
	118	{
	119	/*
	120	* For sectorsize == PAGE_SIZE case, plain >> PAGE_SHIFT is enough.
	121	*
	122	* For sectorsize < PAGE_SIZE case, we only support 64K PAGE_SIZE,
	123	* and have ensured that all tree blocks are contained in one page,
	124	* thus we always get index == 0.
	125	*/
	126	return offset >> PAGE_SHIFT;
	127	}
	128
ac467772 QW	129	/*
	130	* Structure to record how many bytes and which ranges are set/cleared
	131	*/
	132	struct extent_changeset {
	133	/* How many bytes are set/cleared in this operation */
b642b52d	134	u64 bytes_changed;
ac467772 QW	135
ac467772 QW	136	/* Changed ranges */
53d32359	137	struct ulist range_changed;
ac467772 QW	138	};
ac467772 QW	139
364ecf36 QW	140	static inline void extent_changeset_init(struct extent_changeset *changeset)
	141	{
	142	changeset->bytes_changed = 0;
	143	ulist_init(&changeset->range_changed);
	144	}
	145
	146	static inline struct extent_changeset *extent_changeset_alloc(void)
	147	{
	148	struct extent_changeset *ret;
	149
	150	ret = kmalloc(sizeof(*ret), GFP_KERNEL);
	151	if (!ret)
	152	return NULL;
	153
	154	extent_changeset_init(ret);
	155	return ret;
	156	}
	157
	158	static inline void extent_changeset_release(struct extent_changeset *changeset)
	159	{
	160	if (!changeset)
	161	return;
	162	changeset->bytes_changed = 0;
	163	ulist_release(&changeset->range_changed);
	164	}
	165
	166	static inline void extent_changeset_free(struct extent_changeset *changeset)
	167	{
	168	if (!changeset)
	169	return;
	170	extent_changeset_release(changeset);
	171	kfree(changeset);
	172	}
	173
d1310b2e CM	174	struct extent_map_tree;
d1310b2e CM	175
477a30ba	176	int try_release_extent_mapping(struct page *page, gfp_t mask);
f7a52a40	177	int try_release_extent_buffer(struct page *page);
cd716d8f	178
fdaf9a58	179	int btrfs_read_folio(struct file file, struct folio folio);
778b8785 CH	180	void extent_write_locked_range(struct inode inode, struct page locked_page,
	181	u64 start, u64 end, struct writeback_control *wbc,
	182	bool pages_dirty);
8ae225a8	183	int extent_writepages(struct address_space *mapping,
d1310b2e	184	struct writeback_control *wbc);
0b32f4bb JB	185	int btree_write_cache_pages(struct address_space *mapping,
0b32f4bb JB	186	struct writeback_control *wbc);
ba206a02	187	void extent_readahead(struct readahead_control *rac);
facee0a0	188	int extent_fiemap(struct btrfs_inode inode, struct fiemap_extent_info fieinfo,
bab16e21	189	u64 start, u64 len);
32443de3 QW	190	int set_page_extent_mapped(struct page *page);
32443de3 QW	191	void clear_page_extent_mapped(struct page *page);
d1310b2e	192
f28491e0	193	struct extent_buffer alloc_extent_buffer(struct btrfs_fs_info fs_info,
3fbaf258	194	u64 start, u64 owner_root, int level);
0f331229 OS	195	struct extent_buffer __alloc_dummy_extent_buffer(struct btrfs_fs_info fs_info,
0f331229 OS	196	u64 start, unsigned long len);
3f556f78	197	struct extent_buffer alloc_dummy_extent_buffer(struct btrfs_fs_info fs_info,
da17066c	198	u64 start);
2b48966a	199	struct extent_buffer btrfs_clone_extent_buffer(const struct extent_buffer src);
f28491e0	200	struct extent_buffer find_extent_buffer(struct btrfs_fs_info fs_info,
452c75c3	201	u64 start);
d1310b2e	202	void free_extent_buffer(struct extent_buffer *eb);
3083ee2e	203	void free_extent_buffer_stale(struct extent_buffer *eb);
bb82ab88 AJ	204	#define WAIT_NONE 0
	205	#define WAIT_COMPLETE 1
	206	#define WAIT_PAGE_LOCK 2
947a6299 QW	207	int read_extent_buffer_pages(struct extent_buffer *eb, int wait, int mirror_num,
947a6299 QW	208	struct btrfs_tree_parent_check *parent_check);
fd8b2b61	209	void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
bfb484d9	210	void btrfs_readahead_tree_block(struct btrfs_fs_info *fs_info,
3fbaf258	211	u64 bytenr, u64 owner_root, u64 gen, int level);
bfb484d9	212	void btrfs_readahead_node_child(struct extent_buffer *node, int slot);
479ed9ab	213
cc5e31a4	214	static inline int num_extent_pages(const struct extent_buffer *eb)
479ed9ab	215	{
4a3dc938 QW	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;
479ed9ab RD	224	}
479ed9ab RD	225
2b48966a	226	static inline int extent_buffer_uptodate(const struct extent_buffer *eb)
ba020491 AJ	227	{
	228	return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
	229	}
	230
1cbb1f45 JM	231	int memcmp_extent_buffer(const struct extent_buffer eb, const void ptrv,
	232	unsigned long start, unsigned long len);
	233	void read_extent_buffer(const struct extent_buffer eb, void dst,
d1310b2e CM	234	unsigned long start,
d1310b2e CM	235	unsigned long len);
a48b73ec JB	236	int read_extent_buffer_to_user_nofault(const struct extent_buffer *eb,
	237	void __user *dst, unsigned long start,
	238	unsigned long len);
2b48966a	239	void write_extent_buffer(const struct extent_buffer eb, const void src,
d1310b2e	240	unsigned long start, unsigned long len);
730c374e QW	241
	242	static inline void write_extent_buffer_chunk_tree_uuid(
	243	const struct extent_buffer eb, const void chunk_tree_uuid)
	244	{
	245	write_extent_buffer(eb, chunk_tree_uuid,
	246	offsetof(struct btrfs_header, chunk_tree_uuid),
	247	BTRFS_FSID_SIZE);
	248	}
	249
	250	static inline void write_extent_buffer_fsid(const struct extent_buffer *eb,
	251	const void *fsid)
	252	{
	253	write_extent_buffer(eb, fsid, offsetof(struct btrfs_header, fsid),
	254	BTRFS_FSID_SIZE);
	255	}
	256
2b48966a DS	257	void copy_extent_buffer_full(const struct extent_buffer *dst,
	258	const struct extent_buffer *src);
	259	void copy_extent_buffer(const struct extent_buffer *dst,
	260	const struct extent_buffer *src,
d1310b2e CM	261	unsigned long dst_offset, unsigned long src_offset,
d1310b2e CM	262	unsigned long len);
2b48966a DS	263	void memcpy_extent_buffer(const struct extent_buffer *dst,
	264	unsigned long dst_offset, unsigned long src_offset,
	265	unsigned long len);
	266	void memmove_extent_buffer(const struct extent_buffer *dst,
	267	unsigned long dst_offset, unsigned long src_offset,
b159fa28	268	unsigned long len);
2b48966a	269	void memzero_extent_buffer(const struct extent_buffer *eb, unsigned long start,
b159fa28	270	unsigned long len);
2b48966a	271	int extent_buffer_test_bit(const struct extent_buffer *eb, unsigned long start,
3e1e8bb7	272	unsigned long pos);
2b48966a	273	void extent_buffer_bitmap_set(const struct extent_buffer *eb, unsigned long start,
3e1e8bb7	274	unsigned long pos, unsigned long len);
2b48966a DS	275	void extent_buffer_bitmap_clear(const struct extent_buffer *eb,
	276	unsigned long start, unsigned long pos,
	277	unsigned long len);
f18cc978	278	void set_extent_buffer_dirty(struct extent_buffer *eb);
09c25a8c	279	void set_extent_buffer_uptodate(struct extent_buffer *eb);
69ba3927	280	void clear_extent_buffer_uptodate(struct extent_buffer *eb);
bd1fa4f0	281	void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
ad7ff17b	282	void extent_clear_unlock_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
74e9194a	283	struct page *locked_page,
f97e27e9	284	u32 bits_to_clear, unsigned long page_ops);
d6f65c27 JB	285	int extent_invalidate_folio(struct extent_io_tree *tree,
d6f65c27 JB	286	struct folio *folio, size_t offset);
98c8d683 JB	287	void btrfs_clear_buffer_dirty(struct btrfs_trans_handle *trans,
98c8d683 JB	288	struct extent_buffer *buf);
dd137dd1 STD	289
dd137dd1 STD	290	int btrfs_alloc_page_array(unsigned int nr_pages, struct page **page_array);
4a54c8c1	291
294e30fe	292	#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
9978059b	293	bool find_lock_delalloc_range(struct inode *inode,
ce9f967f JT	294	struct page locked_page, u64 start,
ce9f967f JT	295	u64 *end);
0d4cf4e6	296	#endif
faa2dbf0	297	struct extent_buffer alloc_test_extent_buffer(struct btrfs_fs_info fs_info,
da17066c	298	u64 start);
3fd63727 JB	299
	300	#ifdef CONFIG_BTRFS_DEBUG
	301	void btrfs_extent_buffer_leak_debug_check(struct btrfs_fs_info *fs_info);
	302	#else
	303	#define btrfs_extent_buffer_leak_debug_check(fs_info) do {} while (0)
	304	#endif
	305
294e30fe	306	#endif