[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 <linux/spinlock.h>
#include <linux/atomic.h>
#include <linux/rwsem.h>
#include <linux/list.h>
#include <linux/slab.h>
#include "compression.h"
#include "messages.h"
#include "ulist.h"
#include "misc.h"

struct page;
struct file;
struct folio;
struct inode;
struct fiemap_extent_info;
struct readahead_control;
struct address_space;
struct writeback_control;
struct extent_io_tree;
struct extent_map_tree;
struct extent_state;
struct btrfs_block_group;
struct btrfs_fs_info;
struct btrfs_inode;
struct btrfs_root;
struct btrfs_trans_handle;
struct btrfs_tree_parent_check;

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,
	/* Indicate the extent buffer is written zeroed out (for zoned) */
	EXTENT_BUFFER_ZONED_ZEROOUT,
	/* 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),
};

/*
 * Folio private values.  Every page that is controlled by the extent map has
 * folio private set to this value.
 */
#define EXTENT_FOLIO_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)))


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;
	u32 len;
	u32 folio_size;
	unsigned long bflags;
	struct btrfs_fs_info *fs_info;

	/*
	 * The address where the eb can be accessed without any cross-page handling.
	 * This can be NULL if not possible.
	 */
	void *addr;

	spinlock_t refs_lock;
	atomic_t refs;
	int read_mirror;
	/* >= 0 if eb belongs to a log tree, -1 otherwise */
	s8 log_index;
	u8 folio_shift;
	struct rcu_head rcu_head;

	struct rw_semaphore lock;

	/*
	 * Pointers to all the folios of the extent buffer.
	 *
	 * For now the folio is always order 0 (aka, a single page).
	 */
	struct folio *folios[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;
};

static inline unsigned long offset_in_eb_folio(const struct extent_buffer *eb,
					       u64 start)
{
	ASSERT(eb->folio_size);
	return start & (eb->folio_size - 1);
}

/*
 * 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_folio(const struct extent_buffer *eb,
					    unsigned long offset)
{
	/*
	 * 1) sectorsize == PAGE_SIZE and nodesize >= PAGE_SIZE case
	 *    1.1) One large folio covering the whole eb
	 *	   The eb->start is aligned to folio size, thus adding it
	 *	   won't cause any difference.
	 *    1.2) Several page sized folios
	 *	   The eb->start is aligned to folio (page) size, thus
	 *	   adding it won't cause any difference.
	 *
	 * 2) sectorsize < PAGE_SIZE and nodesize < PAGE_SIZE case
	 *    In this case there would only be one page sized folio, and there
	 *    may be several different extent buffers in the page/folio.
	 *    We need to add eb->start to properly access the offset inside
	 *    that eb.
	 */
	return offset_in_folio(eb->folios[0], offset + eb->start);
}

static inline unsigned long get_eb_folio_index(const struct extent_buffer *eb,
					       unsigned long offset)
{
	/*
	 * 1) sectorsize == PAGE_SIZE and nodesize >= PAGE_SIZE case
	 *    1.1) One large folio covering the whole eb.
	 *	   the folio_shift would be large enough to always make us
	 *	   return 0 as index.
	 *    1.2) Several page sized folios
	 *         The folio_shift would be PAGE_SHIFT, giving us the correct
	 *         index.
	 *
	 * 2) sectorsize < PAGE_SIZE and nodesize < PAGE_SIZE case
	 *    The folio would only be page sized, and always give us 0 as index.
	 */
	return offset >> eb->folio_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_prealloc(struct extent_changeset *changeset, gfp_t gfp_mask)
{
	ulist_prealloc(&changeset->range_changed, gfp_mask);
}

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);
}

bool 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, const struct page *locked_page,
			       u64 start, u64 end, struct writeback_control *wbc,
			       bool pages_dirty);
int btrfs_writepages(struct address_space *mapping, struct writeback_control *wbc);
int btree_write_cache_pages(struct address_space *mapping,
			    struct writeback_control *wbc);
void btrfs_readahead(struct readahead_control *rac);
int set_folio_extent_mapped(struct folio *folio);
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,
			     const 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;
}

/*
 * This can only be determined at runtime by checking eb::folios[0].
 *
 * As we can have either one large folio covering the whole eb
 * (either nodesize <= PAGE_SIZE, or high order folio), or multiple
 * single-paged folios.
 */
static inline int num_extent_folios(const struct extent_buffer *eb)
{
	if (folio_order(eb->folios[0]))
		return 1;
	return num_extent_pages(eb);
}

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_clear_unlock_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
				  const struct page *locked_page,
				  struct extent_state **cached,
				  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,
			   bool nofail);
int btrfs_alloc_folio_array(unsigned int nr_folios, struct folio **folio_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>
602035d7 DS	10	#include <linux/spinlock.h>
	11	#include <linux/atomic.h>
	12	#include <linux/rwsem.h>
	13	#include <linux/list.h>
	14	#include <linux/slab.h>
0ff40013	15	#include "compression.h"
84cda1a6	16	#include "messages.h"
ac467772	17	#include "ulist.h"
fd8d2951	18	#include "misc.h"
d1310b2e	19
602035d7 DS	20	struct page;
	21	struct file;
	22	struct folio;
	23	struct inode;
	24	struct fiemap_extent_info;
	25	struct readahead_control;
	26	struct address_space;
	27	struct writeback_control;
	28	struct extent_io_tree;
	29	struct extent_map_tree;
6b0a63a4	30	struct extent_state;
602035d7 DS	31	struct btrfs_block_group;
	32	struct btrfs_fs_info;
	33	struct btrfs_inode;
	34	struct btrfs_root;
98c8d683	35	struct btrfs_trans_handle;
602035d7	36	struct btrfs_tree_parent_check;
98c8d683	37
80cb3836 DS	38	enum {
	39	EXTENT_BUFFER_UPTODATE,
	40	EXTENT_BUFFER_DIRTY,
	41	EXTENT_BUFFER_CORRUPT,
	42	/* this got triggered by readahead */
	43	EXTENT_BUFFER_READAHEAD,
	44	EXTENT_BUFFER_TREE_REF,
	45	EXTENT_BUFFER_STALE,
	46	EXTENT_BUFFER_WRITEBACK,
	47	/* read IO error */
	48	EXTENT_BUFFER_READ_ERR,
	49	EXTENT_BUFFER_UNMAPPED,
	50	EXTENT_BUFFER_IN_TREE,
	51	/* write IO error */
	52	EXTENT_BUFFER_WRITE_ERR,
cbf44cd9 JT	53	/* Indicate the extent buffer is written zeroed out (for zoned) */
cbf44cd9 JT	54	EXTENT_BUFFER_ZONED_ZEROOUT,
d7172f52 CH	55	/* Indicate that extent buffer pages a being read */
d7172f52 CH	56	EXTENT_BUFFER_READING,
80cb3836	57	};
b4ce94de	58
da2c7009	59	/* these are flags for __process_pages_contig */
fd8d2951 DS	60	enum {
	61	ENUM_BIT(PAGE_UNLOCK),
	62	/* Page starts writeback, clear dirty bit and set writeback bit */
	63	ENUM_BIT(PAGE_START_WRITEBACK),
	64	ENUM_BIT(PAGE_END_WRITEBACK),
	65	ENUM_BIT(PAGE_SET_ORDERED),
fd8d2951	66	};
a791e35e	67
d1310b2e	68	/*
cfbf07e2 QW	69	* Folio private values. Every page that is controlled by the extent map has
cfbf07e2 QW	70	* folio private set to this value.
d1310b2e	71	*/
cfbf07e2	72	#define EXTENT_FOLIO_PRIVATE 1
d1310b2e	73
2fe1d551 OS	74	/*
	75	* The extent buffer bitmap operations are done with byte granularity instead of
	76	* word granularity for two reasons:
	77	* 1. The bitmaps must be little-endian on disk.
	78	* 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
	79	* single word in a bitmap may straddle two pages in the extent buffer.
	80	*/
	81	#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
	82	#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
	83	#define BITMAP_FIRST_BYTE_MASK(start) \
	84	((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
	85	#define BITMAP_LAST_BYTE_MASK(nbits) \
	86	(BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
	87
a758781d	88
a62a3bd9 JB	89	int __init extent_buffer_init_cachep(void);
	90	void __cold extent_buffer_free_cachep(void);
	91
deb67895	92	#define INLINE_EXTENT_BUFFER_PAGES (BTRFS_MAX_METADATA_BLOCKSIZE / PAGE_SIZE)
d1310b2e CM	93	struct extent_buffer {
d1310b2e CM	94	u64 start;
84cda1a6 QW	95	u32 len;
84cda1a6 QW	96	u32 folio_size;
b4ce94de	97	unsigned long bflags;
f28491e0	98	struct btrfs_fs_info *fs_info;
397239ed QW	99
	100	/*
	101	* The address where the eb can be accessed without any cross-page handling.
	102	* This can be NULL if not possible.
	103	*/
	104	void *addr;
	105
3083ee2e	106	spinlock_t refs_lock;
727011e0	107	atomic_t refs;
5cf1ab56	108	int read_mirror;
656f30db	109	/* >= 0 if eb belongs to a log tree, -1 otherwise */
dc516164	110	s8 log_index;
84cda1a6	111	u8 folio_shift;
150cce2d	112	struct rcu_head rcu_head;
dc516164 DS	113
dc516164 DS	114	struct rw_semaphore lock;
bd681513	115
082d5bb9 QW	116	/*
	117	* Pointers to all the folios of the extent buffer.
	118	*
	119	* For now the folio is always order 0 (aka, a single page).
	120	*/
	121	struct folio *folios[INLINE_EXTENT_BUFFER_PAGES];
6d49ba1b ES	122	#ifdef CONFIG_BTRFS_DEBUG
6d49ba1b ES	123	struct list_head leak_list;
150cce2d	124	pid_t lock_owner;
6d49ba1b	125	#endif
d1310b2e CM	126	};
d1310b2e CM	127
861093ef NA	128	struct btrfs_eb_write_context {
	129	struct writeback_control *wbc;
	130	struct extent_buffer *eb;
7db94301 NA	131	/* Block group @eb resides in. Only used for zoned mode. */
7db94301 NA	132	struct btrfs_block_group *zoned_bg;
861093ef NA	133	};
861093ef NA	134
84cda1a6 QW	135	static inline unsigned long offset_in_eb_folio(const struct extent_buffer *eb,
	136	u64 start)
	137	{
	138	ASSERT(eb->folio_size);
	139	return start & (eb->folio_size - 1);
	140	}
	141
9b48adda JB	142	/*
	143	* Get the correct offset inside the page of extent buffer.
	144	*
	145	* @eb: target extent buffer
	146	* @start: offset inside the extent buffer
	147	*
	148	* Will handle both sectorsize == PAGE_SIZE and sectorsize < PAGE_SIZE cases.
	149	*/
8d993618 QW	150	static inline size_t get_eb_offset_in_folio(const struct extent_buffer *eb,
8d993618 QW	151	unsigned long offset)
9b48adda JB	152	{
9b48adda JB	153	/*
8d993618 QW	154	* 1) sectorsize == PAGE_SIZE and nodesize >= PAGE_SIZE case
	155	* 1.1) One large folio covering the whole eb
	156	* The eb->start is aligned to folio size, thus adding it
	157	* won't cause any difference.
	158	* 1.2) Several page sized folios
	159	* The eb->start is aligned to folio (page) size, thus
	160	* adding it won't cause any difference.
9b48adda	161	*
8d993618 QW	162	* 2) sectorsize < PAGE_SIZE and nodesize < PAGE_SIZE case
	163	* In this case there would only be one page sized folio, and there
	164	* may be several different extent buffers in the page/folio.
	165	* We need to add eb->start to properly access the offset inside
	166	* that eb.
9b48adda	167	*/
8d993618	168	return offset_in_folio(eb->folios[0], offset + eb->start);
9b48adda JB	169	}
9b48adda JB	170
8d993618 QW	171	static inline unsigned long get_eb_folio_index(const struct extent_buffer *eb,
8d993618 QW	172	unsigned long offset)
9b48adda JB	173	{
9b48adda JB	174	/*
8d993618 QW	175	* 1) sectorsize == PAGE_SIZE and nodesize >= PAGE_SIZE case
	176	* 1.1) One large folio covering the whole eb.
	177	* the folio_shift would be large enough to always make us
	178	* return 0 as index.
	179	* 1.2) Several page sized folios
84cda1a6	180	* The folio_shift would be PAGE_SHIFT, giving us the correct
8d993618	181	* index.
9b48adda	182	*
8d993618 QW	183	* 2) sectorsize < PAGE_SIZE and nodesize < PAGE_SIZE case
8d993618 QW	184	* The folio would only be page sized, and always give us 0 as index.
9b48adda	185	*/
84cda1a6	186	return offset >> eb->folio_shift;
9b48adda JB	187	}
9b48adda JB	188
ac467772 QW	189	/*
	190	* Structure to record how many bytes and which ranges are set/cleared
	191	*/
	192	struct extent_changeset {
	193	/* How many bytes are set/cleared in this operation */
b642b52d	194	u64 bytes_changed;
ac467772 QW	195
ac467772 QW	196	/* Changed ranges */
53d32359	197	struct ulist range_changed;
ac467772 QW	198	};
ac467772 QW	199
364ecf36 QW	200	static inline void extent_changeset_init(struct extent_changeset *changeset)
	201	{
	202	changeset->bytes_changed = 0;
	203	ulist_init(&changeset->range_changed);
	204	}
	205
	206	static inline struct extent_changeset *extent_changeset_alloc(void)
	207	{
	208	struct extent_changeset *ret;
	209
	210	ret = kmalloc(sizeof(*ret), GFP_KERNEL);
	211	if (!ret)
	212	return NULL;
	213
	214	extent_changeset_init(ret);
	215	return ret;
	216	}
	217
33336c18 BB	218	static inline void extent_changeset_prealloc(struct extent_changeset *changeset, gfp_t gfp_mask)
	219	{
	220	ulist_prealloc(&changeset->range_changed, gfp_mask);
	221	}
	222
364ecf36 QW	223	static inline void extent_changeset_release(struct extent_changeset *changeset)
	224	{
	225	if (!changeset)
	226	return;
	227	changeset->bytes_changed = 0;
	228	ulist_release(&changeset->range_changed);
	229	}
	230
	231	static inline void extent_changeset_free(struct extent_changeset *changeset)
	232	{
	233	if (!changeset)
	234	return;
	235	extent_changeset_release(changeset);
	236	kfree(changeset);
	237	}
	238
de6f14e8	239	bool try_release_extent_mapping(struct page *page, gfp_t mask);
f7a52a40	240	int try_release_extent_buffer(struct page *page);
cd716d8f	241
fdaf9a58	242	int btrfs_read_folio(struct file file, struct folio folio);
2917f741	243	void extent_write_locked_range(struct inode inode, const struct page locked_page,
778b8785 CH	244	u64 start, u64 end, struct writeback_control *wbc,
778b8785 CH	245	bool pages_dirty);
c66f2afc	246	int btrfs_writepages(struct address_space mapping, struct writeback_control wbc);
0b32f4bb JB	247	int btree_write_cache_pages(struct address_space *mapping,
0b32f4bb JB	248	struct writeback_control *wbc);
7938d38b	249	void btrfs_readahead(struct readahead_control *rac);
dfba9f47	250	int set_folio_extent_mapped(struct folio *folio);
32443de3 QW	251	int set_page_extent_mapped(struct page *page);
32443de3 QW	252	void clear_page_extent_mapped(struct page *page);
d1310b2e	253
f28491e0	254	struct extent_buffer alloc_extent_buffer(struct btrfs_fs_info fs_info,
3fbaf258	255	u64 start, u64 owner_root, int level);
0f331229 OS	256	struct extent_buffer __alloc_dummy_extent_buffer(struct btrfs_fs_info fs_info,
0f331229 OS	257	u64 start, unsigned long len);
3f556f78	258	struct extent_buffer alloc_dummy_extent_buffer(struct btrfs_fs_info fs_info,
da17066c	259	u64 start);
2b48966a	260	struct extent_buffer btrfs_clone_extent_buffer(const struct extent_buffer src);
f28491e0	261	struct extent_buffer find_extent_buffer(struct btrfs_fs_info fs_info,
452c75c3	262	u64 start);
d1310b2e	263	void free_extent_buffer(struct extent_buffer *eb);
3083ee2e	264	void free_extent_buffer_stale(struct extent_buffer *eb);
bb82ab88 AJ	265	#define WAIT_NONE 0
	266	#define WAIT_COMPLETE 1
	267	#define WAIT_PAGE_LOCK 2
947a6299	268	int read_extent_buffer_pages(struct extent_buffer *eb, int wait, int mirror_num,
2917f741	269	const struct btrfs_tree_parent_check *parent_check);
fd8b2b61	270	void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
bfb484d9	271	void btrfs_readahead_tree_block(struct btrfs_fs_info *fs_info,
3fbaf258	272	u64 bytenr, u64 owner_root, u64 gen, int level);
bfb484d9	273	void btrfs_readahead_node_child(struct extent_buffer *node, int slot);
479ed9ab	274
cc5e31a4	275	static inline int num_extent_pages(const struct extent_buffer *eb)
479ed9ab	276	{
4a3dc938 QW	277	/*
	278	* For sectorsize == PAGE_SIZE case, since nodesize is always aligned to
	279	* sectorsize, it's just eb->len >> PAGE_SHIFT.
	280	*
	281	* For sectorsize < PAGE_SIZE case, we could have nodesize < PAGE_SIZE,
	282	* thus have to ensure we get at least one page.
	283	*/
	284	return (eb->len >> PAGE_SHIFT) ?: 1;
479ed9ab RD	285	}
479ed9ab RD	286
13df3775 QW	287	/*
	288	* This can only be determined at runtime by checking eb::folios[0].
	289	*
	290	* As we can have either one large folio covering the whole eb
	291	* (either nodesize <= PAGE_SIZE, or high order folio), or multiple
	292	* single-paged folios.
	293	*/
	294	static inline int num_extent_folios(const struct extent_buffer *eb)
	295	{
	296	if (folio_order(eb->folios[0]))
	297	return 1;
	298	return num_extent_pages(eb);
	299	}
	300
2b48966a	301	static inline int extent_buffer_uptodate(const struct extent_buffer *eb)
ba020491 AJ	302	{
	303	return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
	304	}
	305
1cbb1f45 JM	306	int memcmp_extent_buffer(const struct extent_buffer eb, const void ptrv,
	307	unsigned long start, unsigned long len);
	308	void read_extent_buffer(const struct extent_buffer eb, void dst,
d1310b2e CM	309	unsigned long start,
d1310b2e CM	310	unsigned long len);
a48b73ec JB	311	int read_extent_buffer_to_user_nofault(const struct extent_buffer *eb,
	312	void __user *dst, unsigned long start,
	313	unsigned long len);
2b48966a	314	void write_extent_buffer(const struct extent_buffer eb, const void src,
d1310b2e	315	unsigned long start, unsigned long len);
730c374e QW	316
	317	static inline void write_extent_buffer_chunk_tree_uuid(
	318	const struct extent_buffer eb, const void chunk_tree_uuid)
	319	{
	320	write_extent_buffer(eb, chunk_tree_uuid,
	321	offsetof(struct btrfs_header, chunk_tree_uuid),
	322	BTRFS_FSID_SIZE);
	323	}
	324
	325	static inline void write_extent_buffer_fsid(const struct extent_buffer *eb,
	326	const void *fsid)
	327	{
	328	write_extent_buffer(eb, fsid, offsetof(struct btrfs_header, fsid),
	329	BTRFS_FSID_SIZE);
	330	}
	331
2b48966a DS	332	void copy_extent_buffer_full(const struct extent_buffer *dst,
	333	const struct extent_buffer *src);
	334	void copy_extent_buffer(const struct extent_buffer *dst,
	335	const struct extent_buffer *src,
d1310b2e CM	336	unsigned long dst_offset, unsigned long src_offset,
d1310b2e CM	337	unsigned long len);
2b48966a DS	338	void memcpy_extent_buffer(const struct extent_buffer *dst,
	339	unsigned long dst_offset, unsigned long src_offset,
	340	unsigned long len);
	341	void memmove_extent_buffer(const struct extent_buffer *dst,
	342	unsigned long dst_offset, unsigned long src_offset,
b159fa28	343	unsigned long len);
2b48966a	344	void memzero_extent_buffer(const struct extent_buffer *eb, unsigned long start,
b159fa28	345	unsigned long len);
2b48966a	346	int extent_buffer_test_bit(const struct extent_buffer *eb, unsigned long start,
3e1e8bb7	347	unsigned long pos);
2b48966a	348	void extent_buffer_bitmap_set(const struct extent_buffer *eb, unsigned long start,
3e1e8bb7	349	unsigned long pos, unsigned long len);
2b48966a DS	350	void extent_buffer_bitmap_clear(const struct extent_buffer *eb,
	351	unsigned long start, unsigned long pos,
	352	unsigned long len);
f18cc978	353	void set_extent_buffer_dirty(struct extent_buffer *eb);
09c25a8c	354	void set_extent_buffer_uptodate(struct extent_buffer *eb);
69ba3927	355	void clear_extent_buffer_uptodate(struct extent_buffer *eb);
ad7ff17b	356	void extent_clear_unlock_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
2917f741	357	const struct page *locked_page,
6b0a63a4	358	struct extent_state **cached,
f97e27e9	359	u32 bits_to_clear, unsigned long page_ops);
d6f65c27 JB	360	int extent_invalidate_folio(struct extent_io_tree *tree,
d6f65c27 JB	361	struct folio *folio, size_t offset);
98c8d683 JB	362	void btrfs_clear_buffer_dirty(struct btrfs_trans_handle *trans,
98c8d683 JB	363	struct extent_buffer *buf);
dd137dd1	364
09e6cef1	365	int btrfs_alloc_page_array(unsigned int nr_pages, struct page **page_array,
0fbf6cbd	366	bool nofail);
fea91134	367	int btrfs_alloc_folio_array(unsigned int nr_folios, struct folio **folio_array);
4a54c8c1	368
294e30fe	369	#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
9978059b	370	bool find_lock_delalloc_range(struct inode *inode,
ce9f967f JT	371	struct page locked_page, u64 start,
ce9f967f JT	372	u64 *end);
0d4cf4e6	373	#endif
faa2dbf0	374	struct extent_buffer alloc_test_extent_buffer(struct btrfs_fs_info fs_info,
da17066c	375	u64 start);
3fd63727 JB	376
	377	#ifdef CONFIG_BTRFS_DEBUG
	378	void btrfs_extent_buffer_leak_debug_check(struct btrfs_fs_info *fs_info);
	379	#else
	380	#define btrfs_extent_buffer_leak_debug_check(fs_info) do {} while (0)
	381	#endif
	382
294e30fe	383	#endif