[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"

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 */
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),
	ENUM_BIT(PAGE_SET_ERROR),
	ENUM_BIT(PAGE_LOCK),
};

/*
 * 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_fs_info;
struct io_failure_record;
struct extent_io_tree;

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;
	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 extent_invalidate_folio(struct extent_io_tree *tree,
			    struct folio *folio, size_t offset);

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

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 {
	/* Use rb_simple_node for search/insert */
	struct {
		struct rb_node rb_node;
		u64 bytenr;
	};
	struct page *page;
	u64 len;
	u64 logical;
	int this_mirror;
	int failed_mirror;
	int num_copies;
};

int btrfs_repair_one_sector(struct btrfs_inode *inode, struct btrfs_bio *failed_bbio,
			    u32 bio_offset, struct page *page, unsigned int pgoff,
			    bool submit_buffered);
void btrfs_free_io_failure_record(struct btrfs_inode *inode, u64 start, u64 end);
int btrfs_clean_io_failure(struct btrfs_inode *inode, u64 start,
			   struct page *page, unsigned int pg_offset);

#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
80cb3836 DS	14	enum {
	15	EXTENT_BUFFER_UPTODATE,
	16	EXTENT_BUFFER_DIRTY,
	17	EXTENT_BUFFER_CORRUPT,
	18	/* this got triggered by readahead */
	19	EXTENT_BUFFER_READAHEAD,
	20	EXTENT_BUFFER_TREE_REF,
	21	EXTENT_BUFFER_STALE,
	22	EXTENT_BUFFER_WRITEBACK,
	23	/* read IO error */
	24	EXTENT_BUFFER_READ_ERR,
	25	EXTENT_BUFFER_UNMAPPED,
	26	EXTENT_BUFFER_IN_TREE,
	27	/* write IO error */
	28	EXTENT_BUFFER_WRITE_ERR,
d3575156	29	EXTENT_BUFFER_NO_CHECK,
80cb3836	30	};
b4ce94de	31
da2c7009	32	/* these are flags for __process_pages_contig */
fd8d2951 DS	33	enum {
	34	ENUM_BIT(PAGE_UNLOCK),
	35	/* Page starts writeback, clear dirty bit and set writeback bit */
	36	ENUM_BIT(PAGE_START_WRITEBACK),
	37	ENUM_BIT(PAGE_END_WRITEBACK),
	38	ENUM_BIT(PAGE_SET_ORDERED),
	39	ENUM_BIT(PAGE_SET_ERROR),
	40	ENUM_BIT(PAGE_LOCK),
	41	};
a791e35e	42
d1310b2e CM	43	/*
	44	* page->private values. Every page that is controlled by the extent
	45	* map has page->private set to one.
	46	*/
	47	#define EXTENT_PAGE_PRIVATE 1
d1310b2e	48
2fe1d551 OS	49	/*
	50	* The extent buffer bitmap operations are done with byte granularity instead of
	51	* word granularity for two reasons:
	52	* 1. The bitmaps must be little-endian on disk.
	53	* 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
	54	* single word in a bitmap may straddle two pages in the extent buffer.
	55	*/
	56	#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
	57	#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
	58	#define BITMAP_FIRST_BYTE_MASK(start) \
	59	((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
	60	#define BITMAP_LAST_BYTE_MASK(nbits) \
	61	(BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
	62
7aa51232	63	struct btrfs_bio;
ea466794	64	struct btrfs_root;
6fc0ef68	65	struct btrfs_inode;
183ebab7	66	struct btrfs_fs_info;
47dc196a	67	struct io_failure_record;
9c7d3a54	68	struct extent_io_tree;
a758781d	69
a62a3bd9 JB	70	int __init extent_buffer_init_cachep(void);
	71	void __cold extent_buffer_free_cachep(void);
	72
deb67895	73	#define INLINE_EXTENT_BUFFER_PAGES (BTRFS_MAX_METADATA_BLOCKSIZE / PAGE_SIZE)
d1310b2e CM	74	struct extent_buffer {
	75	u64 start;
	76	unsigned long len;
b4ce94de	77	unsigned long bflags;
f28491e0	78	struct btrfs_fs_info *fs_info;
3083ee2e	79	spinlock_t refs_lock;
727011e0	80	atomic_t refs;
0b32f4bb	81	atomic_t io_pages;
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];
d3575156	91	struct list_head release_list;
6d49ba1b ES	92	#ifdef CONFIG_BTRFS_DEBUG
	93	struct list_head leak_list;
	94	#endif
d1310b2e CM	95	};
d1310b2e CM	96
ac467772 QW	97	/*
	98	* Structure to record how many bytes and which ranges are set/cleared
	99	*/
	100	struct extent_changeset {
	101	/* How many bytes are set/cleared in this operation */
b642b52d	102	u64 bytes_changed;
ac467772 QW	103
ac467772 QW	104	/* Changed ranges */
53d32359	105	struct ulist range_changed;
ac467772 QW	106	};
ac467772 QW	107
364ecf36 QW	108	static inline void extent_changeset_init(struct extent_changeset *changeset)
	109	{
	110	changeset->bytes_changed = 0;
	111	ulist_init(&changeset->range_changed);
	112	}
	113
	114	static inline struct extent_changeset *extent_changeset_alloc(void)
	115	{
	116	struct extent_changeset *ret;
	117
	118	ret = kmalloc(sizeof(*ret), GFP_KERNEL);
	119	if (!ret)
	120	return NULL;
	121
	122	extent_changeset_init(ret);
	123	return ret;
	124	}
	125
	126	static inline void extent_changeset_release(struct extent_changeset *changeset)
	127	{
	128	if (!changeset)
	129	return;
	130	changeset->bytes_changed = 0;
	131	ulist_release(&changeset->range_changed);
	132	}
	133
	134	static inline void extent_changeset_free(struct extent_changeset *changeset)
	135	{
	136	if (!changeset)
	137	return;
	138	extent_changeset_release(changeset);
	139	kfree(changeset);
	140	}
	141
d1310b2e CM	142	struct extent_map_tree;
d1310b2e CM	143
477a30ba	144	int try_release_extent_mapping(struct page *page, gfp_t mask);
f7a52a40	145	int try_release_extent_buffer(struct page *page);
cd716d8f	146
fdaf9a58	147	int btrfs_read_folio(struct file file, struct folio folio);
2bd0fc93	148	int extent_write_locked_range(struct inode *inode, u64 start, u64 end);
8ae225a8	149	int extent_writepages(struct address_space *mapping,
d1310b2e	150	struct writeback_control *wbc);
0b32f4bb JB	151	int btree_write_cache_pages(struct address_space *mapping,
0b32f4bb JB	152	struct writeback_control *wbc);
ba206a02	153	void extent_readahead(struct readahead_control *rac);
facee0a0	154	int extent_fiemap(struct btrfs_inode inode, struct fiemap_extent_info fieinfo,
bab16e21	155	u64 start, u64 len);
32443de3 QW	156	int set_page_extent_mapped(struct page *page);
32443de3 QW	157	void clear_page_extent_mapped(struct page *page);
d1310b2e	158
f28491e0	159	struct extent_buffer alloc_extent_buffer(struct btrfs_fs_info fs_info,
3fbaf258	160	u64 start, u64 owner_root, int level);
0f331229 OS	161	struct extent_buffer __alloc_dummy_extent_buffer(struct btrfs_fs_info fs_info,
0f331229 OS	162	u64 start, unsigned long len);
3f556f78	163	struct extent_buffer alloc_dummy_extent_buffer(struct btrfs_fs_info fs_info,
da17066c	164	u64 start);
2b48966a	165	struct extent_buffer btrfs_clone_extent_buffer(const struct extent_buffer src);
f28491e0	166	struct extent_buffer find_extent_buffer(struct btrfs_fs_info fs_info,
452c75c3	167	u64 start);
d1310b2e	168	void free_extent_buffer(struct extent_buffer *eb);
3083ee2e	169	void free_extent_buffer_stale(struct extent_buffer *eb);
bb82ab88 AJ	170	#define WAIT_NONE 0
	171	#define WAIT_COMPLETE 1
	172	#define WAIT_PAGE_LOCK 2
c2ccfbc6	173	int read_extent_buffer_pages(struct extent_buffer *eb, int wait,
6af49dbd	174	int mirror_num);
fd8b2b61	175	void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
bfb484d9	176	void btrfs_readahead_tree_block(struct btrfs_fs_info *fs_info,
3fbaf258	177	u64 bytenr, u64 owner_root, u64 gen, int level);
bfb484d9	178	void btrfs_readahead_node_child(struct extent_buffer *node, int slot);
479ed9ab	179
cc5e31a4	180	static inline int num_extent_pages(const struct extent_buffer *eb)
479ed9ab	181	{
4a3dc938 QW	182	/*
	183	* For sectorsize == PAGE_SIZE case, since nodesize is always aligned to
	184	* sectorsize, it's just eb->len >> PAGE_SHIFT.
	185	*
	186	* For sectorsize < PAGE_SIZE case, we could have nodesize < PAGE_SIZE,
	187	* thus have to ensure we get at least one page.
	188	*/
	189	return (eb->len >> PAGE_SHIFT) ?: 1;
479ed9ab RD	190	}
479ed9ab RD	191
2b48966a	192	static inline int extent_buffer_uptodate(const struct extent_buffer *eb)
ba020491 AJ	193	{
	194	return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
	195	}
	196
1cbb1f45 JM	197	int memcmp_extent_buffer(const struct extent_buffer eb, const void ptrv,
	198	unsigned long start, unsigned long len);
	199	void read_extent_buffer(const struct extent_buffer eb, void dst,
d1310b2e CM	200	unsigned long start,
d1310b2e CM	201	unsigned long len);
a48b73ec JB	202	int read_extent_buffer_to_user_nofault(const struct extent_buffer *eb,
	203	void __user *dst, unsigned long start,
	204	unsigned long len);
2b48966a DS	205	void write_extent_buffer_fsid(const struct extent_buffer eb, const void src);
2b48966a DS	206	void write_extent_buffer_chunk_tree_uuid(const struct extent_buffer *eb,
f157bf76	207	const void *src);
2b48966a	208	void write_extent_buffer(const struct extent_buffer eb, const void src,
d1310b2e	209	unsigned long start, unsigned long len);
2b48966a DS	210	void copy_extent_buffer_full(const struct extent_buffer *dst,
	211	const struct extent_buffer *src);
	212	void copy_extent_buffer(const struct extent_buffer *dst,
	213	const struct extent_buffer *src,
d1310b2e CM	214	unsigned long dst_offset, unsigned long src_offset,
d1310b2e CM	215	unsigned long len);
2b48966a DS	216	void memcpy_extent_buffer(const struct extent_buffer *dst,
	217	unsigned long dst_offset, unsigned long src_offset,
	218	unsigned long len);
	219	void memmove_extent_buffer(const struct extent_buffer *dst,
	220	unsigned long dst_offset, unsigned long src_offset,
b159fa28	221	unsigned long len);
2b48966a	222	void memzero_extent_buffer(const struct extent_buffer *eb, unsigned long start,
b159fa28	223	unsigned long len);
2b48966a	224	int extent_buffer_test_bit(const struct extent_buffer *eb, unsigned long start,
3e1e8bb7	225	unsigned long pos);
2b48966a	226	void extent_buffer_bitmap_set(const struct extent_buffer *eb, unsigned long start,
3e1e8bb7	227	unsigned long pos, unsigned long len);
2b48966a DS	228	void extent_buffer_bitmap_clear(const struct extent_buffer *eb,
	229	unsigned long start, unsigned long pos,
	230	unsigned long len);
	231	void clear_extent_buffer_dirty(const struct extent_buffer *eb);
abb57ef3	232	bool set_extent_buffer_dirty(struct extent_buffer *eb);
09c25a8c	233	void set_extent_buffer_uptodate(struct extent_buffer *eb);
69ba3927	234	void clear_extent_buffer_uptodate(struct extent_buffer *eb);
2b48966a	235	int extent_buffer_under_io(const struct extent_buffer *eb);
bd1fa4f0	236	void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
f6311572	237	void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
ad7ff17b	238	void extent_clear_unlock_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
74e9194a	239	struct page *locked_page,
f97e27e9	240	u32 bits_to_clear, unsigned long page_ops);
d6f65c27 JB	241	int extent_invalidate_folio(struct extent_io_tree *tree,
d6f65c27 JB	242	struct folio *folio, size_t offset);
dd137dd1 STD	243
dd137dd1 STD	244	int btrfs_alloc_page_array(unsigned int nr_pages, struct page **page_array);
4a54c8c1	245
b5227c07	246	void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
2b48966a	247	int btrfs_repair_eb_io_failure(const struct extent_buffer *eb, int mirror_num);
2fe6303e MX	248
	249	/*
	250	* When IO fails, either with EIO or csum verification fails, we
	251	* try other mirrors that might have a good copy of the data. This
	252	* io_failure_record is used to record state as we go through all the
1245835d	253	* mirrors. If another mirror has good data, the sector is set up to date
2fe6303e MX	254	* and things continue. If a good mirror can't be found, the original
	255	* bio end_io callback is called to indicate things have failed.
	256	*/
	257	struct io_failure_record {
87c11705 JB	258	/* Use rb_simple_node for search/insert */
	259	struct {
	260	struct rb_node rb_node;
	261	u64 bytenr;
	262	};
2fe6303e	263	struct page *page;
2fe6303e MX	264	u64 len;
2fe6303e MX	265	u64 logical;
2fe6303e MX	266	int this_mirror;
2fe6303e MX	267	int failed_mirror;
c144c63f	268	int num_copies;
2fe6303e MX	269	};
2fe6303e MX	270
d8f9268e	271	int btrfs_repair_one_sector(struct btrfs_inode inode, struct btrfs_bio failed_bbio,
7aa51232	272	u32 bio_offset, struct page *page, unsigned int pgoff,
19af6a7d	273	bool submit_buffered);
d6f65c27 JB	274	void btrfs_free_io_failure_record(struct btrfs_inode *inode, u64 start, u64 end);
	275	int btrfs_clean_io_failure(struct btrfs_inode *inode, u64 start,
	276	struct page *page, unsigned int pg_offset);
77d5d689	277
294e30fe	278	#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
9978059b	279	bool find_lock_delalloc_range(struct inode *inode,
ce9f967f JT	280	struct page locked_page, u64 start,
ce9f967f JT	281	u64 *end);
0d4cf4e6	282	#endif
faa2dbf0	283	struct extent_buffer alloc_test_extent_buffer(struct btrfs_fs_info fs_info,
da17066c	284	u64 start);
3fd63727 JB	285
	286	#ifdef CONFIG_BTRFS_DEBUG
	287	void btrfs_extent_buffer_leak_debug_check(struct btrfs_fs_info *fs_info);
	288	#else
	289	#define btrfs_extent_buffer_leak_debug_check(fs_info) do {} while (0)
	290	#endif
	291
294e30fe	292	#endif