[people/ms/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 "compression.h"
#include "ulist.h"

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

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

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

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

struct btrfs_bio;
struct btrfs_root;
struct btrfs_inode;
struct btrfs_io_bio;
struct btrfs_fs_info;
struct io_failure_record;
struct extent_io_tree;

typedef void (submit_bio_hook_t)(struct inode *inode, struct bio *bio,
					 int mirror_num,
					 enum btrfs_compression_type compress_type);

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

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

	struct rw_semaphore lock;

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

/*
 * Structure to record how many bytes and which ranges are set/cleared
 */
struct extent_changeset {
	/* How many bytes are set/cleared in this operation */
	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);
int extent_write_locked_range(struct inode *inode, u64 start, u64 end);
int extent_writepages(struct address_space *mapping,
		      struct writeback_control *wbc);
int btree_write_cache_pages(struct address_space *mapping,
			    struct writeback_control *wbc);
void extent_readahead(struct readahead_control *rac);
int extent_fiemap(struct btrfs_inode *inode, struct fiemap_extent_info *fieinfo,
		  u64 start, u64 len);
int set_page_extent_mapped(struct page *page);
void clear_page_extent_mapped(struct page *page);

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

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

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

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

int btrfs_alloc_page_array(unsigned int nr_pages, struct page **page_array);
struct bio *btrfs_bio_alloc(unsigned int nr_iovecs);
struct bio *btrfs_bio_clone_partial(struct bio *orig, u64 offset, u64 size);

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 sector 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;
	int this_mirror;
	int failed_mirror;
	int num_copies;
};

int btrfs_repair_one_sector(struct inode *inode, struct btrfs_bio *failed_bbio,
			    u32 bio_offset, struct page *page, unsigned int pgoff,
			    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>
0ff40013	10	#include "compression.h"
ac467772	11	#include "ulist.h"
d1310b2e	12
80cb3836 DS	13	enum {
	14	EXTENT_BUFFER_UPTODATE,
	15	EXTENT_BUFFER_DIRTY,
	16	EXTENT_BUFFER_CORRUPT,
	17	/* this got triggered by readahead */
	18	EXTENT_BUFFER_READAHEAD,
	19	EXTENT_BUFFER_TREE_REF,
	20	EXTENT_BUFFER_STALE,
	21	EXTENT_BUFFER_WRITEBACK,
	22	/* read IO error */
	23	EXTENT_BUFFER_READ_ERR,
	24	EXTENT_BUFFER_UNMAPPED,
	25	EXTENT_BUFFER_IN_TREE,
	26	/* write IO error */
	27	EXTENT_BUFFER_WRITE_ERR,
d3575156	28	EXTENT_BUFFER_NO_CHECK,
80cb3836	29	};
b4ce94de	30
da2c7009	31	/* these are flags for __process_pages_contig */
c2790a2e	32	#define PAGE_UNLOCK (1 << 0)
6869b0a8 QW	33	/* Page starts writeback, clear dirty bit and set writeback bit */
	34	#define PAGE_START_WRITEBACK (1 << 1)
	35	#define PAGE_END_WRITEBACK (1 << 2)
f57ad937	36	#define PAGE_SET_ORDERED (1 << 3)
6869b0a8 QW	37	#define PAGE_SET_ERROR (1 << 4)
6869b0a8 QW	38	#define PAGE_LOCK (1 << 5)
a791e35e	39
d1310b2e CM	40	/*
	41	* page->private values. Every page that is controlled by the extent
	42	* map has page->private set to one.
	43	*/
	44	#define EXTENT_PAGE_PRIVATE 1
d1310b2e	45
2fe1d551 OS	46	/*
	47	* The extent buffer bitmap operations are done with byte granularity instead of
	48	* word granularity for two reasons:
	49	* 1. The bitmaps must be little-endian on disk.
	50	* 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
	51	* single word in a bitmap may straddle two pages in the extent buffer.
	52	*/
	53	#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
	54	#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
	55	#define BITMAP_FIRST_BYTE_MASK(start) \
	56	((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
	57	#define BITMAP_LAST_BYTE_MASK(nbits) \
	58	(BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
	59
7aa51232	60	struct btrfs_bio;
ea466794	61	struct btrfs_root;
6fc0ef68	62	struct btrfs_inode;
facc8a22	63	struct btrfs_io_bio;
183ebab7	64	struct btrfs_fs_info;
47dc196a	65	struct io_failure_record;
9c7d3a54	66	struct extent_io_tree;
a758781d	67
ad357938	68	typedef void (submit_bio_hook_t)(struct inode inode, struct bio bio,
77d5d689	69	int mirror_num,
cb3a12d9	70	enum btrfs_compression_type compress_type);
77d5d689	71
8896a08d	72	typedef blk_status_t (extent_submit_bio_start_t)(struct inode *inode,
1941b64b	73	struct bio *bio, u64 dio_file_offset);
a758781d	74
deb67895	75	#define INLINE_EXTENT_BUFFER_PAGES (BTRFS_MAX_METADATA_BLOCKSIZE / PAGE_SIZE)
d1310b2e CM	76	struct extent_buffer {
	77	u64 start;
	78	unsigned long len;
b4ce94de	79	unsigned long bflags;
f28491e0	80	struct btrfs_fs_info *fs_info;
3083ee2e	81	spinlock_t refs_lock;
727011e0	82	atomic_t refs;
0b32f4bb	83	atomic_t io_pages;
5cf1ab56	84	int read_mirror;
19fe0a8b	85	struct rcu_head rcu_head;
5b25f70f	86	pid_t lock_owner;
656f30db	87	/* >= 0 if eb belongs to a log tree, -1 otherwise */
dc516164 DS	88	s8 log_index;
	89
	90	struct rw_semaphore lock;
bd681513	91
b8dae313	92	struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
d3575156	93	struct list_head release_list;
6d49ba1b ES	94	#ifdef CONFIG_BTRFS_DEBUG
	95	struct list_head leak_list;
	96	#endif
d1310b2e CM	97	};
d1310b2e CM	98
ac467772 QW	99	/*
	100	* Structure to record how many bytes and which ranges are set/cleared
	101	*/
	102	struct extent_changeset {
	103	/* How many bytes are set/cleared in this operation */
b642b52d	104	u64 bytes_changed;
ac467772 QW	105
ac467772 QW	106	/* Changed ranges */
53d32359	107	struct ulist range_changed;
ac467772 QW	108	};
ac467772 QW	109
364ecf36 QW	110	static inline void extent_changeset_init(struct extent_changeset *changeset)
	111	{
	112	changeset->bytes_changed = 0;
	113	ulist_init(&changeset->range_changed);
	114	}
	115
	116	static inline struct extent_changeset *extent_changeset_alloc(void)
	117	{
	118	struct extent_changeset *ret;
	119
	120	ret = kmalloc(sizeof(*ret), GFP_KERNEL);
	121	if (!ret)
	122	return NULL;
	123
	124	extent_changeset_init(ret);
	125	return ret;
	126	}
	127
	128	static inline void extent_changeset_release(struct extent_changeset *changeset)
	129	{
	130	if (!changeset)
	131	return;
	132	changeset->bytes_changed = 0;
	133	ulist_release(&changeset->range_changed);
	134	}
	135
	136	static inline void extent_changeset_free(struct extent_changeset *changeset)
	137	{
	138	if (!changeset)
	139	return;
	140	extent_changeset_release(changeset);
	141	kfree(changeset);
	142	}
	143
d1310b2e CM	144	struct extent_map_tree;
d1310b2e CM	145
477a30ba	146	int try_release_extent_mapping(struct page *page, gfp_t mask);
f7a52a40	147	int try_release_extent_buffer(struct page *page);
cd716d8f	148
fdaf9a58	149	int btrfs_read_folio(struct file file, struct folio folio);
2bd0fc93	150	int extent_write_locked_range(struct inode *inode, u64 start, u64 end);
8ae225a8	151	int extent_writepages(struct address_space *mapping,
d1310b2e	152	struct writeback_control *wbc);
0b32f4bb JB	153	int btree_write_cache_pages(struct address_space *mapping,
0b32f4bb JB	154	struct writeback_control *wbc);
ba206a02	155	void extent_readahead(struct readahead_control *rac);
facee0a0	156	int extent_fiemap(struct btrfs_inode inode, struct fiemap_extent_info fieinfo,
bab16e21	157	u64 start, u64 len);
32443de3 QW	158	int set_page_extent_mapped(struct page *page);
32443de3 QW	159	void clear_page_extent_mapped(struct page *page);
d1310b2e	160
f28491e0	161	struct extent_buffer alloc_extent_buffer(struct btrfs_fs_info fs_info,
3fbaf258	162	u64 start, u64 owner_root, int level);
0f331229 OS	163	struct extent_buffer __alloc_dummy_extent_buffer(struct btrfs_fs_info fs_info,
0f331229 OS	164	u64 start, unsigned long len);
3f556f78	165	struct extent_buffer alloc_dummy_extent_buffer(struct btrfs_fs_info fs_info,
da17066c	166	u64 start);
2b48966a	167	struct extent_buffer btrfs_clone_extent_buffer(const struct extent_buffer src);
f28491e0	168	struct extent_buffer find_extent_buffer(struct btrfs_fs_info fs_info,
452c75c3	169	u64 start);
d1310b2e	170	void free_extent_buffer(struct extent_buffer *eb);
3083ee2e	171	void free_extent_buffer_stale(struct extent_buffer *eb);
bb82ab88 AJ	172	#define WAIT_NONE 0
	173	#define WAIT_COMPLETE 1
	174	#define WAIT_PAGE_LOCK 2
c2ccfbc6	175	int read_extent_buffer_pages(struct extent_buffer *eb, int wait,
6af49dbd	176	int mirror_num);
fd8b2b61	177	void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
bfb484d9	178	void btrfs_readahead_tree_block(struct btrfs_fs_info *fs_info,
3fbaf258	179	u64 bytenr, u64 owner_root, u64 gen, int level);
bfb484d9	180	void btrfs_readahead_node_child(struct extent_buffer *node, int slot);
479ed9ab	181
cc5e31a4	182	static inline int num_extent_pages(const struct extent_buffer *eb)
479ed9ab	183	{
4a3dc938 QW	184	/*
	185	* For sectorsize == PAGE_SIZE case, since nodesize is always aligned to
	186	* sectorsize, it's just eb->len >> PAGE_SHIFT.
	187	*
	188	* For sectorsize < PAGE_SIZE case, we could have nodesize < PAGE_SIZE,
	189	* thus have to ensure we get at least one page.
	190	*/
	191	return (eb->len >> PAGE_SHIFT) ?: 1;
479ed9ab RD	192	}
479ed9ab RD	193
2b48966a	194	static inline int extent_buffer_uptodate(const struct extent_buffer *eb)
ba020491 AJ	195	{
	196	return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
	197	}
	198
1cbb1f45 JM	199	int memcmp_extent_buffer(const struct extent_buffer eb, const void ptrv,
	200	unsigned long start, unsigned long len);
	201	void read_extent_buffer(const struct extent_buffer eb, void dst,
d1310b2e CM	202	unsigned long start,
d1310b2e CM	203	unsigned long len);
a48b73ec JB	204	int read_extent_buffer_to_user_nofault(const struct extent_buffer *eb,
	205	void __user *dst, unsigned long start,
	206	unsigned long len);
2b48966a DS	207	void write_extent_buffer_fsid(const struct extent_buffer eb, const void src);
2b48966a DS	208	void write_extent_buffer_chunk_tree_uuid(const struct extent_buffer *eb,
f157bf76	209	const void *src);
2b48966a	210	void write_extent_buffer(const struct extent_buffer eb, const void src,
d1310b2e	211	unsigned long start, unsigned long len);
2b48966a DS	212	void copy_extent_buffer_full(const struct extent_buffer *dst,
	213	const struct extent_buffer *src);
	214	void copy_extent_buffer(const struct extent_buffer *dst,
	215	const struct extent_buffer *src,
d1310b2e CM	216	unsigned long dst_offset, unsigned long src_offset,
d1310b2e CM	217	unsigned long len);
2b48966a DS	218	void memcpy_extent_buffer(const struct extent_buffer *dst,
	219	unsigned long dst_offset, unsigned long src_offset,
	220	unsigned long len);
	221	void memmove_extent_buffer(const struct extent_buffer *dst,
	222	unsigned long dst_offset, unsigned long src_offset,
b159fa28	223	unsigned long len);
2b48966a	224	void memzero_extent_buffer(const struct extent_buffer *eb, unsigned long start,
b159fa28	225	unsigned long len);
2b48966a	226	int extent_buffer_test_bit(const struct extent_buffer *eb, unsigned long start,
3e1e8bb7	227	unsigned long pos);
2b48966a	228	void extent_buffer_bitmap_set(const struct extent_buffer *eb, unsigned long start,
3e1e8bb7	229	unsigned long pos, unsigned long len);
2b48966a DS	230	void extent_buffer_bitmap_clear(const struct extent_buffer *eb,
	231	unsigned long start, unsigned long pos,
	232	unsigned long len);
	233	void clear_extent_buffer_dirty(const struct extent_buffer *eb);
abb57ef3	234	bool set_extent_buffer_dirty(struct extent_buffer *eb);
09c25a8c	235	void set_extent_buffer_uptodate(struct extent_buffer *eb);
69ba3927	236	void clear_extent_buffer_uptodate(struct extent_buffer *eb);
2b48966a	237	int extent_buffer_under_io(const struct extent_buffer *eb);
bd1fa4f0	238	void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
f6311572	239	void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
ad7ff17b	240	void extent_clear_unlock_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
74e9194a	241	struct page *locked_page,
f97e27e9	242	u32 bits_to_clear, unsigned long page_ops);
dd137dd1 STD	243
dd137dd1 STD	244	int btrfs_alloc_page_array(unsigned int nr_pages, struct page **page_array);
c3a3b19b	245	struct bio *btrfs_bio_alloc(unsigned int nr_iovecs);
21dda654	246	struct bio btrfs_bio_clone_partial(struct bio orig, u64 offset, u64 size);
4a54c8c1	247
b5227c07	248	void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
2b48966a	249	int btrfs_repair_eb_io_failure(const struct extent_buffer *eb, int mirror_num);
2fe6303e MX	250
	251	/*
	252	* When IO fails, either with EIO or csum verification fails, we
	253	* try other mirrors that might have a good copy of the data. This
	254	* io_failure_record is used to record state as we go through all the
1245835d	255	* mirrors. If another mirror has good data, the sector is set up to date
2fe6303e MX	256	* and things continue. If a good mirror can't be found, the original
	257	* bio end_io callback is called to indicate things have failed.
	258	*/
	259	struct io_failure_record {
	260	struct page *page;
	261	u64 start;
	262	u64 len;
	263	u64 logical;
2fe6303e MX	264	int this_mirror;
2fe6303e MX	265	int failed_mirror;
c144c63f	266	int num_copies;
2fe6303e MX	267	};
2fe6303e MX	268
7aa51232 CH	269	int btrfs_repair_one_sector(struct inode inode, struct btrfs_bio failed_bbio,
7aa51232 CH	270	u32 bio_offset, struct page *page, unsigned int pgoff,
150e4b05	271	submit_bio_hook_t *submit_bio_hook);
77d5d689	272
294e30fe	273	#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
9978059b	274	bool find_lock_delalloc_range(struct inode *inode,
ce9f967f JT	275	struct page locked_page, u64 start,
ce9f967f JT	276	u64 *end);
0d4cf4e6	277	#endif
faa2dbf0	278	struct extent_buffer alloc_test_extent_buffer(struct btrfs_fs_info fs_info,
da17066c	279	u64 start);
3fd63727 JB	280
	281	#ifdef CONFIG_BTRFS_DEBUG
	282	void btrfs_extent_buffer_leak_debug_check(struct btrfs_fs_info *fs_info);
	283	#else
	284	#define btrfs_extent_buffer_leak_debug_check(fs_info) do {} while (0)
	285	#endif
	286
294e30fe	287	#endif