[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 "ulist.h"

/*
 * flags for bio submission. The high bits indicate the compression
 * type for this bio
 */
#define EXTENT_BIO_COMPRESSED 1
#define EXTENT_BIO_FLAG_SHIFT 16

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,
	EXTENT_BUFFER_ZONE_FINISH,
};

/* 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_root;
struct btrfs_inode;
struct btrfs_io_bio;
struct btrfs_fs_info;
struct io_failure_record;
struct extent_io_tree;

typedef blk_status_t (submit_bio_hook_t)(struct inode *inode, struct bio *bio,
					 int mirror_num,
					 unsigned long bio_flags);

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 info about the bio being assembled, and other info like
 * how many bytes are there before stripe/ordered extent boundary.
 */
struct btrfs_bio_ctrl {
	struct bio *bio;
	unsigned long bio_flags;
	u32 len_to_stripe_boundary;
	u32 len_to_oe_boundary;
};

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

static inline void extent_set_compress_type(unsigned long *bio_flags,
					    int compress_type)
{
	*bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
}

static inline int extent_compress_type(unsigned long bio_flags)
{
	return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
}

struct extent_map_tree;

typedef struct extent_map *(get_extent_t)(struct btrfs_inode *inode,
					  struct page *page, size_t pg_offset,
					  u64 start, u64 len);

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

int __must_check submit_one_bio(struct bio *bio, int mirror_num,
				unsigned long bio_flags);
int btrfs_do_readpage(struct page *page, struct extent_map **em_cached,
		      struct btrfs_bio_ctrl *bio_ctrl,
		      unsigned int read_flags, u64 *prev_em_start);
int extent_write_full_page(struct page *page, struct writeback_control *wbc);
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);
struct bio *btrfs_bio_alloc(unsigned int nr_iovecs);
struct bio *btrfs_bio_clone(struct bio *bio);
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;
	unsigned long bio_flags;
	int this_mirror;
	int failed_mirror;
};

int btrfs_repair_one_sector(struct inode *inode,
			    struct bio *failed_bio, u32 bio_offset,
			    struct page *page, unsigned int pgoff,
			    u64 start, int failed_mirror,
			    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>
ac467772	10	#include "ulist.h"
d1310b2e	11
261507a0 LZ	12	/*
	13	* flags for bio submission. The high bits indicate the compression
	14	* type for this bio
	15	*/
c8b97818	16	#define EXTENT_BIO_COMPRESSED 1
261507a0	17	#define EXTENT_BIO_FLAG_SHIFT 16
c8b97818	18
80cb3836 DS	19	enum {
	20	EXTENT_BUFFER_UPTODATE,
	21	EXTENT_BUFFER_DIRTY,
	22	EXTENT_BUFFER_CORRUPT,
	23	/* this got triggered by readahead */
	24	EXTENT_BUFFER_READAHEAD,
	25	EXTENT_BUFFER_TREE_REF,
	26	EXTENT_BUFFER_STALE,
	27	EXTENT_BUFFER_WRITEBACK,
	28	/* read IO error */
	29	EXTENT_BUFFER_READ_ERR,
	30	EXTENT_BUFFER_UNMAPPED,
	31	EXTENT_BUFFER_IN_TREE,
	32	/* write IO error */
	33	EXTENT_BUFFER_WRITE_ERR,
d3575156	34	EXTENT_BUFFER_NO_CHECK,
be1a1d7a	35	EXTENT_BUFFER_ZONE_FINISH,
80cb3836	36	};
b4ce94de	37
da2c7009	38	/* these are flags for __process_pages_contig */
c2790a2e	39	#define PAGE_UNLOCK (1 << 0)
6869b0a8 QW	40	/* Page starts writeback, clear dirty bit and set writeback bit */
	41	#define PAGE_START_WRITEBACK (1 << 1)
	42	#define PAGE_END_WRITEBACK (1 << 2)
f57ad937	43	#define PAGE_SET_ORDERED (1 << 3)
6869b0a8 QW	44	#define PAGE_SET_ERROR (1 << 4)
6869b0a8 QW	45	#define PAGE_LOCK (1 << 5)
a791e35e	46
d1310b2e CM	47	/*
	48	* page->private values. Every page that is controlled by the extent
	49	* map has page->private set to one.
	50	*/
	51	#define EXTENT_PAGE_PRIVATE 1
d1310b2e	52
2fe1d551 OS	53	/*
	54	* The extent buffer bitmap operations are done with byte granularity instead of
	55	* word granularity for two reasons:
	56	* 1. The bitmaps must be little-endian on disk.
	57	* 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
	58	* single word in a bitmap may straddle two pages in the extent buffer.
	59	*/
	60	#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
	61	#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
	62	#define BITMAP_FIRST_BYTE_MASK(start) \
	63	((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
	64	#define BITMAP_LAST_BYTE_MASK(nbits) \
	65	(BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
	66
ea466794	67	struct btrfs_root;
6fc0ef68	68	struct btrfs_inode;
facc8a22	69	struct btrfs_io_bio;
183ebab7	70	struct btrfs_fs_info;
47dc196a	71	struct io_failure_record;
9c7d3a54	72	struct extent_io_tree;
a758781d	73
77d5d689 OS	74	typedef blk_status_t (submit_bio_hook_t)(struct inode inode, struct bio bio,
	75	int mirror_num,
	76	unsigned long bio_flags);
	77
8896a08d	78	typedef blk_status_t (extent_submit_bio_start_t)(struct inode *inode,
1941b64b	79	struct bio *bio, u64 dio_file_offset);
a758781d	80
deb67895	81	#define INLINE_EXTENT_BUFFER_PAGES (BTRFS_MAX_METADATA_BLOCKSIZE / PAGE_SIZE)
d1310b2e CM	82	struct extent_buffer {
	83	u64 start;
	84	unsigned long len;
b4ce94de	85	unsigned long bflags;
f28491e0	86	struct btrfs_fs_info *fs_info;
3083ee2e	87	spinlock_t refs_lock;
727011e0	88	atomic_t refs;
0b32f4bb	89	atomic_t io_pages;
5cf1ab56	90	int read_mirror;
19fe0a8b	91	struct rcu_head rcu_head;
5b25f70f	92	pid_t lock_owner;
656f30db	93	/* >= 0 if eb belongs to a log tree, -1 otherwise */
dc516164 DS	94	s8 log_index;
	95
	96	struct rw_semaphore lock;
bd681513	97
b8dae313	98	struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
d3575156	99	struct list_head release_list;
6d49ba1b ES	100	#ifdef CONFIG_BTRFS_DEBUG
	101	struct list_head leak_list;
	102	#endif
d1310b2e CM	103	};
d1310b2e CM	104
390ed29b QW	105	/*
	106	* Structure to record info about the bio being assembled, and other info like
	107	* how many bytes are there before stripe/ordered extent boundary.
	108	*/
	109	struct btrfs_bio_ctrl {
	110	struct bio *bio;
	111	unsigned long bio_flags;
	112	u32 len_to_stripe_boundary;
	113	u32 len_to_oe_boundary;
	114	};
	115
ac467772 QW	116	/*
	117	* Structure to record how many bytes and which ranges are set/cleared
	118	*/
	119	struct extent_changeset {
	120	/* How many bytes are set/cleared in this operation */
7bc329c1	121	unsigned int bytes_changed;
ac467772 QW	122
ac467772 QW	123	/* Changed ranges */
53d32359	124	struct ulist range_changed;
ac467772 QW	125	};
ac467772 QW	126
364ecf36 QW	127	static inline void extent_changeset_init(struct extent_changeset *changeset)
	128	{
	129	changeset->bytes_changed = 0;
	130	ulist_init(&changeset->range_changed);
	131	}
	132
	133	static inline struct extent_changeset *extent_changeset_alloc(void)
	134	{
	135	struct extent_changeset *ret;
	136
	137	ret = kmalloc(sizeof(*ret), GFP_KERNEL);
	138	if (!ret)
	139	return NULL;
	140
	141	extent_changeset_init(ret);
	142	return ret;
	143	}
	144
	145	static inline void extent_changeset_release(struct extent_changeset *changeset)
	146	{
	147	if (!changeset)
	148	return;
	149	changeset->bytes_changed = 0;
	150	ulist_release(&changeset->range_changed);
	151	}
	152
	153	static inline void extent_changeset_free(struct extent_changeset *changeset)
	154	{
	155	if (!changeset)
	156	return;
	157	extent_changeset_release(changeset);
	158	kfree(changeset);
	159	}
	160
261507a0 LZ	161	static inline void extent_set_compress_type(unsigned long *bio_flags,
	162	int compress_type)
	163	{
	164	*bio_flags \|= compress_type << EXTENT_BIO_FLAG_SHIFT;
	165	}
	166
	167	static inline int extent_compress_type(unsigned long bio_flags)
	168	{
	169	return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
	170	}
	171
d1310b2e CM	172	struct extent_map_tree;
d1310b2e CM	173
fc4f21b1	174	typedef struct extent_map (get_extent_t)(struct btrfs_inode inode,
39b07b5d OS	175	struct page *page, size_t pg_offset,
39b07b5d OS	176	u64 start, u64 len);
d1310b2e	177
477a30ba	178	int try_release_extent_mapping(struct page *page, gfp_t mask);
f7a52a40	179	int try_release_extent_buffer(struct page *page);
cd716d8f	180
c1be9c1a NB	181	int __must_check submit_one_bio(struct bio *bio, int mirror_num,
c1be9c1a NB	182	unsigned long bio_flags);
0f208812	183	int btrfs_do_readpage(struct page page, struct extent_map *em_cached,
390ed29b	184	struct btrfs_bio_ctrl *bio_ctrl,
0f208812	185	unsigned int read_flags, u64 *prev_em_start);
0a9b0e53	186	int extent_write_full_page(struct page page, struct writeback_control wbc);
2bd0fc93	187	int extent_write_locked_range(struct inode *inode, u64 start, u64 end);
8ae225a8	188	int extent_writepages(struct address_space *mapping,
d1310b2e	189	struct writeback_control *wbc);
0b32f4bb JB	190	int btree_write_cache_pages(struct address_space *mapping,
0b32f4bb JB	191	struct writeback_control *wbc);
ba206a02	192	void extent_readahead(struct readahead_control *rac);
facee0a0	193	int extent_fiemap(struct btrfs_inode inode, struct fiemap_extent_info fieinfo,
bab16e21	194	u64 start, u64 len);
32443de3 QW	195	int set_page_extent_mapped(struct page *page);
32443de3 QW	196	void clear_page_extent_mapped(struct page *page);
d1310b2e	197
f28491e0	198	struct extent_buffer alloc_extent_buffer(struct btrfs_fs_info fs_info,
3fbaf258	199	u64 start, u64 owner_root, int level);
0f331229 OS	200	struct extent_buffer __alloc_dummy_extent_buffer(struct btrfs_fs_info fs_info,
0f331229 OS	201	u64 start, unsigned long len);
3f556f78	202	struct extent_buffer alloc_dummy_extent_buffer(struct btrfs_fs_info fs_info,
da17066c	203	u64 start);
2b48966a	204	struct extent_buffer btrfs_clone_extent_buffer(const struct extent_buffer src);
f28491e0	205	struct extent_buffer find_extent_buffer(struct btrfs_fs_info fs_info,
452c75c3	206	u64 start);
d1310b2e	207	void free_extent_buffer(struct extent_buffer *eb);
3083ee2e	208	void free_extent_buffer_stale(struct extent_buffer *eb);
bb82ab88 AJ	209	#define WAIT_NONE 0
	210	#define WAIT_COMPLETE 1
	211	#define WAIT_PAGE_LOCK 2
c2ccfbc6	212	int read_extent_buffer_pages(struct extent_buffer *eb, int wait,
6af49dbd	213	int mirror_num);
fd8b2b61	214	void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
bfb484d9	215	void btrfs_readahead_tree_block(struct btrfs_fs_info *fs_info,
3fbaf258	216	u64 bytenr, u64 owner_root, u64 gen, int level);
bfb484d9	217	void btrfs_readahead_node_child(struct extent_buffer *node, int slot);
479ed9ab	218
cc5e31a4	219	static inline int num_extent_pages(const struct extent_buffer *eb)
479ed9ab	220	{
4a3dc938 QW	221	/*
	222	* For sectorsize == PAGE_SIZE case, since nodesize is always aligned to
	223	* sectorsize, it's just eb->len >> PAGE_SHIFT.
	224	*
	225	* For sectorsize < PAGE_SIZE case, we could have nodesize < PAGE_SIZE,
	226	* thus have to ensure we get at least one page.
	227	*/
	228	return (eb->len >> PAGE_SHIFT) ?: 1;
479ed9ab RD	229	}
479ed9ab RD	230
2b48966a	231	static inline int extent_buffer_uptodate(const struct extent_buffer *eb)
ba020491 AJ	232	{
	233	return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
	234	}
	235
1cbb1f45 JM	236	int memcmp_extent_buffer(const struct extent_buffer eb, const void ptrv,
	237	unsigned long start, unsigned long len);
	238	void read_extent_buffer(const struct extent_buffer eb, void dst,
d1310b2e CM	239	unsigned long start,
d1310b2e CM	240	unsigned long len);
a48b73ec JB	241	int read_extent_buffer_to_user_nofault(const struct extent_buffer *eb,
	242	void __user *dst, unsigned long start,
	243	unsigned long len);
2b48966a DS	244	void write_extent_buffer_fsid(const struct extent_buffer eb, const void src);
2b48966a DS	245	void write_extent_buffer_chunk_tree_uuid(const struct extent_buffer *eb,
f157bf76	246	const void *src);
2b48966a	247	void write_extent_buffer(const struct extent_buffer eb, const void src,
d1310b2e	248	unsigned long start, unsigned long len);
2b48966a DS	249	void copy_extent_buffer_full(const struct extent_buffer *dst,
	250	const struct extent_buffer *src);
	251	void copy_extent_buffer(const struct extent_buffer *dst,
	252	const struct extent_buffer *src,
d1310b2e CM	253	unsigned long dst_offset, unsigned long src_offset,
d1310b2e CM	254	unsigned long len);
2b48966a DS	255	void memcpy_extent_buffer(const struct extent_buffer *dst,
	256	unsigned long dst_offset, unsigned long src_offset,
	257	unsigned long len);
	258	void memmove_extent_buffer(const struct extent_buffer *dst,
	259	unsigned long dst_offset, unsigned long src_offset,
b159fa28	260	unsigned long len);
2b48966a	261	void memzero_extent_buffer(const struct extent_buffer *eb, unsigned long start,
b159fa28	262	unsigned long len);
2b48966a	263	int extent_buffer_test_bit(const struct extent_buffer *eb, unsigned long start,
3e1e8bb7	264	unsigned long pos);
2b48966a	265	void extent_buffer_bitmap_set(const struct extent_buffer *eb, unsigned long start,
3e1e8bb7	266	unsigned long pos, unsigned long len);
2b48966a DS	267	void extent_buffer_bitmap_clear(const struct extent_buffer *eb,
	268	unsigned long start, unsigned long pos,
	269	unsigned long len);
	270	void clear_extent_buffer_dirty(const struct extent_buffer *eb);
abb57ef3	271	bool set_extent_buffer_dirty(struct extent_buffer *eb);
09c25a8c	272	void set_extent_buffer_uptodate(struct extent_buffer *eb);
69ba3927	273	void clear_extent_buffer_uptodate(struct extent_buffer *eb);
2b48966a	274	int extent_buffer_under_io(const struct extent_buffer *eb);
bd1fa4f0	275	void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
f6311572	276	void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
ad7ff17b	277	void extent_clear_unlock_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
74e9194a	278	struct page *locked_page,
f97e27e9	279	u32 bits_to_clear, unsigned long page_ops);
c3a3b19b	280	struct bio *btrfs_bio_alloc(unsigned int nr_iovecs);
8b6c1d56	281	struct bio btrfs_bio_clone(struct bio bio);
21dda654	282	struct bio btrfs_bio_clone_partial(struct bio orig, u64 offset, u64 size);
4a54c8c1	283
b5227c07	284	void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
2b48966a	285	int btrfs_repair_eb_io_failure(const struct extent_buffer *eb, int mirror_num);
2fe6303e MX	286
	287	/*
	288	* When IO fails, either with EIO or csum verification fails, we
	289	* try other mirrors that might have a good copy of the data. This
	290	* io_failure_record is used to record state as we go through all the
1245835d	291	* mirrors. If another mirror has good data, the sector is set up to date
2fe6303e MX	292	* and things continue. If a good mirror can't be found, the original
	293	* bio end_io callback is called to indicate things have failed.
	294	*/
	295	struct io_failure_record {
	296	struct page *page;
	297	u64 start;
	298	u64 len;
	299	u64 logical;
	300	unsigned long bio_flags;
	301	int this_mirror;
	302	int failed_mirror;
2fe6303e MX	303	};
2fe6303e MX	304
150e4b05 QW	305	int btrfs_repair_one_sector(struct inode *inode,
	306	struct bio *failed_bio, u32 bio_offset,
	307	struct page *page, unsigned int pgoff,
	308	u64 start, int failed_mirror,
	309	submit_bio_hook_t *submit_bio_hook);
77d5d689	310
294e30fe	311	#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
9978059b	312	bool find_lock_delalloc_range(struct inode *inode,
ce9f967f JT	313	struct page locked_page, u64 start,
ce9f967f JT	314	u64 *end);
0d4cf4e6	315	#endif
faa2dbf0	316	struct extent_buffer alloc_test_extent_buffer(struct btrfs_fs_info fs_info,
da17066c	317	u64 start);
3fd63727 JB	318
	319	#ifdef CONFIG_BTRFS_DEBUG
	320	void btrfs_extent_buffer_leak_debug_check(struct btrfs_fs_info *fs_info);
	321	#else
	322	#define btrfs_extent_buffer_leak_debug_check(fs_info) do {} while (0)
	323	#endif
	324
294e30fe	325	#endif