[linux-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;
	/* >= 0 if eb belongs to a log tree, -1 otherwise */
	s8 log_index;
	struct rcu_head rcu_head;

	struct rw_semaphore lock;

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

struct btrfs_eb_write_context {
	struct writeback_control *wbc;
	struct extent_buffer *eb;
	/* Block group @eb resides in. Only used for zoned mode. */
	struct btrfs_block_group *zoned_bg;
};

/*
 * 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;
656f30db	83	/* >= 0 if eb belongs to a log tree, -1 otherwise */
dc516164	84	s8 log_index;
150cce2d	85	struct rcu_head rcu_head;
dc516164 DS	86
dc516164 DS	87	struct rw_semaphore lock;
bd681513	88
b8dae313	89	struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
6d49ba1b ES	90	#ifdef CONFIG_BTRFS_DEBUG
6d49ba1b ES	91	struct list_head leak_list;
150cce2d	92	pid_t lock_owner;
6d49ba1b	93	#endif
d1310b2e CM	94	};
d1310b2e CM	95
861093ef NA	96	struct btrfs_eb_write_context {
	97	struct writeback_control *wbc;
	98	struct extent_buffer *eb;
7db94301 NA	99	/* Block group @eb resides in. Only used for zoned mode. */
7db94301 NA	100	struct btrfs_block_group *zoned_bg;
861093ef NA	101	};
861093ef NA	102
9b48adda JB	103	/*
	104	* Get the correct offset inside the page of extent buffer.
	105	*
	106	* @eb: target extent buffer
	107	* @start: offset inside the extent buffer
	108	*
	109	* Will handle both sectorsize == PAGE_SIZE and sectorsize < PAGE_SIZE cases.
	110	*/
	111	static inline size_t get_eb_offset_in_page(const struct extent_buffer *eb,
	112	unsigned long offset)
	113	{
	114	/*
	115	* For sectorsize == PAGE_SIZE case, eb->start will always be aligned
	116	* to PAGE_SIZE, thus adding it won't cause any difference.
	117	*
	118	* For sectorsize < PAGE_SIZE, we must only read the data that belongs
	119	* to the eb, thus we have to take the eb->start into consideration.
	120	*/
	121	return offset_in_page(offset + eb->start);
	122	}
	123
	124	static inline unsigned long get_eb_page_index(unsigned long offset)
	125	{
	126	/*
	127	* For sectorsize == PAGE_SIZE case, plain >> PAGE_SHIFT is enough.
	128	*
	129	* For sectorsize < PAGE_SIZE case, we only support 64K PAGE_SIZE,
	130	* and have ensured that all tree blocks are contained in one page,
	131	* thus we always get index == 0.
	132	*/
	133	return offset >> PAGE_SHIFT;
	134	}
	135
ac467772 QW	136	/*
	137	* Structure to record how many bytes and which ranges are set/cleared
	138	*/
	139	struct extent_changeset {
	140	/* How many bytes are set/cleared in this operation */
b642b52d	141	u64 bytes_changed;
ac467772 QW	142
ac467772 QW	143	/* Changed ranges */
53d32359	144	struct ulist range_changed;
ac467772 QW	145	};
ac467772 QW	146
364ecf36 QW	147	static inline void extent_changeset_init(struct extent_changeset *changeset)
	148	{
	149	changeset->bytes_changed = 0;
	150	ulist_init(&changeset->range_changed);
	151	}
	152
	153	static inline struct extent_changeset *extent_changeset_alloc(void)
	154	{
	155	struct extent_changeset *ret;
	156
	157	ret = kmalloc(sizeof(*ret), GFP_KERNEL);
	158	if (!ret)
	159	return NULL;
	160
	161	extent_changeset_init(ret);
	162	return ret;
	163	}
	164
	165	static inline void extent_changeset_release(struct extent_changeset *changeset)
	166	{
	167	if (!changeset)
	168	return;
	169	changeset->bytes_changed = 0;
	170	ulist_release(&changeset->range_changed);
	171	}
	172
	173	static inline void extent_changeset_free(struct extent_changeset *changeset)
	174	{
	175	if (!changeset)
	176	return;
	177	extent_changeset_release(changeset);
	178	kfree(changeset);
	179	}
	180
d1310b2e CM	181	struct extent_map_tree;
d1310b2e CM	182
477a30ba	183	int try_release_extent_mapping(struct page *page, gfp_t mask);
f7a52a40	184	int try_release_extent_buffer(struct page *page);
cd716d8f	185
fdaf9a58	186	int btrfs_read_folio(struct file file, struct folio folio);
778b8785 CH	187	void extent_write_locked_range(struct inode inode, struct page locked_page,
	188	u64 start, u64 end, struct writeback_control *wbc,
	189	bool pages_dirty);
8ae225a8	190	int extent_writepages(struct address_space *mapping,
d1310b2e	191	struct writeback_control *wbc);
0b32f4bb JB	192	int btree_write_cache_pages(struct address_space *mapping,
0b32f4bb JB	193	struct writeback_control *wbc);
ba206a02	194	void extent_readahead(struct readahead_control *rac);
facee0a0	195	int extent_fiemap(struct btrfs_inode inode, struct fiemap_extent_info fieinfo,
bab16e21	196	u64 start, u64 len);
32443de3 QW	197	int set_page_extent_mapped(struct page *page);
32443de3 QW	198	void clear_page_extent_mapped(struct page *page);
d1310b2e	199
f28491e0	200	struct extent_buffer alloc_extent_buffer(struct btrfs_fs_info fs_info,
3fbaf258	201	u64 start, u64 owner_root, int level);
0f331229 OS	202	struct extent_buffer __alloc_dummy_extent_buffer(struct btrfs_fs_info fs_info,
0f331229 OS	203	u64 start, unsigned long len);
3f556f78	204	struct extent_buffer alloc_dummy_extent_buffer(struct btrfs_fs_info fs_info,
da17066c	205	u64 start);
2b48966a	206	struct extent_buffer btrfs_clone_extent_buffer(const struct extent_buffer src);
f28491e0	207	struct extent_buffer find_extent_buffer(struct btrfs_fs_info fs_info,
452c75c3	208	u64 start);
d1310b2e	209	void free_extent_buffer(struct extent_buffer *eb);
3083ee2e	210	void free_extent_buffer_stale(struct extent_buffer *eb);
bb82ab88 AJ	211	#define WAIT_NONE 0
	212	#define WAIT_COMPLETE 1
	213	#define WAIT_PAGE_LOCK 2
947a6299 QW	214	int read_extent_buffer_pages(struct extent_buffer *eb, int wait, int mirror_num,
947a6299 QW	215	struct btrfs_tree_parent_check *parent_check);
fd8b2b61	216	void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
bfb484d9	217	void btrfs_readahead_tree_block(struct btrfs_fs_info *fs_info,
3fbaf258	218	u64 bytenr, u64 owner_root, u64 gen, int level);
bfb484d9	219	void btrfs_readahead_node_child(struct extent_buffer *node, int slot);
479ed9ab	220
cc5e31a4	221	static inline int num_extent_pages(const struct extent_buffer *eb)
479ed9ab	222	{
4a3dc938 QW	223	/*
	224	* For sectorsize == PAGE_SIZE case, since nodesize is always aligned to
	225	* sectorsize, it's just eb->len >> PAGE_SHIFT.
	226	*
	227	* For sectorsize < PAGE_SIZE case, we could have nodesize < PAGE_SIZE,
	228	* thus have to ensure we get at least one page.
	229	*/
	230	return (eb->len >> PAGE_SHIFT) ?: 1;
479ed9ab RD	231	}
479ed9ab RD	232
2b48966a	233	static inline int extent_buffer_uptodate(const struct extent_buffer *eb)
ba020491 AJ	234	{
	235	return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
	236	}
	237
1cbb1f45 JM	238	int memcmp_extent_buffer(const struct extent_buffer eb, const void ptrv,
	239	unsigned long start, unsigned long len);
	240	void read_extent_buffer(const struct extent_buffer eb, void dst,
d1310b2e CM	241	unsigned long start,
d1310b2e CM	242	unsigned long len);
a48b73ec JB	243	int read_extent_buffer_to_user_nofault(const struct extent_buffer *eb,
	244	void __user *dst, unsigned long start,
	245	unsigned long len);
2b48966a	246	void write_extent_buffer(const struct extent_buffer eb, const void src,
d1310b2e	247	unsigned long start, unsigned long len);
730c374e QW	248
	249	static inline void write_extent_buffer_chunk_tree_uuid(
	250	const struct extent_buffer eb, const void chunk_tree_uuid)
	251	{
	252	write_extent_buffer(eb, chunk_tree_uuid,
	253	offsetof(struct btrfs_header, chunk_tree_uuid),
	254	BTRFS_FSID_SIZE);
	255	}
	256
	257	static inline void write_extent_buffer_fsid(const struct extent_buffer *eb,
	258	const void *fsid)
	259	{
	260	write_extent_buffer(eb, fsid, offsetof(struct btrfs_header, fsid),
	261	BTRFS_FSID_SIZE);
	262	}
	263
2b48966a DS	264	void copy_extent_buffer_full(const struct extent_buffer *dst,
	265	const struct extent_buffer *src);
	266	void copy_extent_buffer(const struct extent_buffer *dst,
	267	const struct extent_buffer *src,
d1310b2e CM	268	unsigned long dst_offset, unsigned long src_offset,
d1310b2e CM	269	unsigned long len);
2b48966a DS	270	void memcpy_extent_buffer(const struct extent_buffer *dst,
	271	unsigned long dst_offset, unsigned long src_offset,
	272	unsigned long len);
	273	void memmove_extent_buffer(const struct extent_buffer *dst,
	274	unsigned long dst_offset, unsigned long src_offset,
b159fa28	275	unsigned long len);
2b48966a	276	void memzero_extent_buffer(const struct extent_buffer *eb, unsigned long start,
b159fa28	277	unsigned long len);
2b48966a	278	int extent_buffer_test_bit(const struct extent_buffer *eb, unsigned long start,
3e1e8bb7	279	unsigned long pos);
2b48966a	280	void extent_buffer_bitmap_set(const struct extent_buffer *eb, unsigned long start,
3e1e8bb7	281	unsigned long pos, unsigned long len);
2b48966a DS	282	void extent_buffer_bitmap_clear(const struct extent_buffer *eb,
	283	unsigned long start, unsigned long pos,
	284	unsigned long len);
f18cc978	285	void set_extent_buffer_dirty(struct extent_buffer *eb);
09c25a8c	286	void set_extent_buffer_uptodate(struct extent_buffer *eb);
69ba3927	287	void clear_extent_buffer_uptodate(struct extent_buffer *eb);
bd1fa4f0	288	void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
ad7ff17b	289	void extent_clear_unlock_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
74e9194a	290	struct page *locked_page,
f97e27e9	291	u32 bits_to_clear, unsigned long page_ops);
d6f65c27 JB	292	int extent_invalidate_folio(struct extent_io_tree *tree,
d6f65c27 JB	293	struct folio *folio, size_t offset);
98c8d683 JB	294	void btrfs_clear_buffer_dirty(struct btrfs_trans_handle *trans,
98c8d683 JB	295	struct extent_buffer *buf);
dd137dd1 STD	296
dd137dd1 STD	297	int btrfs_alloc_page_array(unsigned int nr_pages, struct page **page_array);
4a54c8c1	298
294e30fe	299	#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
9978059b	300	bool find_lock_delalloc_range(struct inode *inode,
ce9f967f JT	301	struct page locked_page, u64 start,
ce9f967f JT	302	u64 *end);
0d4cf4e6	303	#endif
faa2dbf0	304	struct extent_buffer alloc_test_extent_buffer(struct btrfs_fs_info fs_info,
da17066c	305	u64 start);
3fd63727 JB	306
	307	#ifdef CONFIG_BTRFS_DEBUG
	308	void btrfs_extent_buffer_leak_debug_check(struct btrfs_fs_info *fs_info);
	309	#else
	310	#define btrfs_extent_buffer_leak_debug_check(fs_info) do {} while (0)
	311	#endif
	312
294e30fe	313	#endif