Release 4.10 fs/btrfs/extent_io.h

#ifndef __EXTENTIO__

#define __EXTENTIO__

#include <linux/rbtree.h>
#include "ulist.h"

/* bits for the extent state */

#define EXTENT_DIRTY		(1U << 0)

#define EXTENT_WRITEBACK	(1U << 1)

#define EXTENT_UPTODATE		(1U << 2)

#define EXTENT_LOCKED		(1U << 3)

#define EXTENT_NEW		(1U << 4)

#define EXTENT_DELALLOC		(1U << 5)

#define EXTENT_DEFRAG		(1U << 6)

#define EXTENT_BOUNDARY		(1U << 9)

#define EXTENT_NODATASUM	(1U << 10)

#define EXTENT_DO_ACCOUNTING	(1U << 11)

#define EXTENT_FIRST_DELALLOC	(1U << 12)

#define EXTENT_NEED_WAIT	(1U << 13)

#define EXTENT_DAMAGED		(1U << 14)

#define EXTENT_NORESERVE	(1U << 15)

#define EXTENT_QGROUP_RESERVED	(1U << 16)

#define EXTENT_CLEAR_DATA_RESV	(1U << 17)

#define EXTENT_IOBITS		(EXTENT_LOCKED | EXTENT_WRITEBACK)

#define EXTENT_CTLBITS		(EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)

/*
 * flags for bio submission. The high bits indicate the compression
 * type for this bio
 */

#define EXTENT_BIO_COMPRESSED 1

#define EXTENT_BIO_TREE_LOG 2

#define EXTENT_BIO_FLAG_SHIFT 16

/* these are bit numbers for test/set bit */

#define EXTENT_BUFFER_UPTODATE 0

#define EXTENT_BUFFER_DIRTY 2

#define EXTENT_BUFFER_CORRUPT 3

#define EXTENT_BUFFER_READAHEAD 4	
/* this got triggered by readahead */

#define EXTENT_BUFFER_TREE_REF 5

#define EXTENT_BUFFER_STALE 6

#define EXTENT_BUFFER_WRITEBACK 7

#define EXTENT_BUFFER_READ_ERR 8        
/* read IO error */

#define EXTENT_BUFFER_DUMMY 9

#define EXTENT_BUFFER_IN_TREE 10

#define EXTENT_BUFFER_WRITE_ERR 11    
/* write IO error */

/* these are flags for extent_clear_unlock_delalloc */

#define PAGE_UNLOCK		(1 << 0)

#define PAGE_CLEAR_DIRTY	(1 << 1)

#define PAGE_SET_WRITEBACK	(1 << 2)

#define PAGE_END_WRITEBACK	(1 << 3)

#define PAGE_SET_PRIVATE2	(1 << 4)

#define PAGE_SET_ERROR		(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)))



static inline int le_test_bit(int nr, const u8 *addr)
{
	return 1U & (addr[BIT_BYTE(nr)] >> (nr & (BITS_PER_BYTE-1)));
}

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extern void le_bitmap_set(u8 *map, unsigned int start, int len);
extern void le_bitmap_clear(u8 *map, unsigned int start, int len);

struct extent_state;
struct btrfs_root;
struct btrfs_io_bio;
struct io_failure_record;


typedef	int (extent_submit_bio_hook_t)(struct inode *inode, struct bio *bio,
				       int mirror_num, unsigned long bio_flags,
				       u64 bio_offset);

struct extent_io_ops {
	
int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
			     u64 start, u64 end, int *page_started,
			     unsigned long *nr_written);
	
int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
	
extent_submit_bio_hook_t *submit_bio_hook;
	
int (*merge_bio_hook)(struct page *page, unsigned long offset,
			      size_t size, struct bio *bio,
			      unsigned long bio_flags);
	
int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
	
int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset,
				    struct page *page, u64 start, u64 end,
				    int mirror);
	
int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
				      struct extent_state *state, int uptodate);
	
void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
			     unsigned *bits);
	
void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
			       unsigned *bits);
	
void (*merge_extent_hook)(struct inode *inode,
				  struct extent_state *new,
				  struct extent_state *other);
	
void (*split_extent_hook)(struct inode *inode,
				  struct extent_state *orig, u64 split);
};


struct extent_io_tree {
	
struct rb_root state;
	
struct address_space *mapping;
	
u64 dirty_bytes;
	
int track_uptodate;
	
spinlock_t lock;
	
const struct extent_io_ops *ops;
};


struct extent_state {
	
u64 start;
	
u64 end; /* inclusive */
	
struct rb_node rb_node;

	/* ADD NEW ELEMENTS AFTER THIS */
	
wait_queue_head_t wq;
	
atomic_t refs;
	
unsigned state;

	
struct io_failure_record *failrec;

#ifdef CONFIG_BTRFS_DEBUG
	
struct list_head leak_list;
#endif
};


#define INLINE_EXTENT_BUFFER_PAGES 16

#define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * 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;

	/* count of read lock holders on the extent buffer */
	
atomic_t write_locks;
	
atomic_t read_locks;
	
atomic_t blocking_writers;
	
atomic_t blocking_readers;
	
atomic_t spinning_readers;
	
atomic_t spinning_writers;
	
short lock_nested;
	/* >= 0 if eb belongs to a log tree, -1 otherwise */
	
short log_index;

	/* protects write locks */
	
rwlock_t lock;

	/* readers use lock_wq while they wait for the write
         * lock holders to unlock
         */
	
wait_queue_head_t write_lock_wq;

	/* writers use read_lock_wq while they wait for readers
         * to unlock
         */
	
wait_queue_head_t read_lock_wq;
	
struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
#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_set_compress_type(unsigned long *bio_flags,
					    int compress_type)
{
	*bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
}

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

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struct extent_map_tree;


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

void extent_io_tree_init(struct extent_io_tree *tree,
			 struct address_space *mapping);
int try_release_extent_mapping(struct extent_map_tree *map,
			       struct extent_io_tree *tree, struct page *page,
			       gfp_t mask);
int try_release_extent_buffer(struct page *page);
int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
		     struct extent_state **cached);



static inline int lock_extent(struct extent_io_tree *tree, u64 start, u64 end)
{
	return lock_extent_bits(tree, start, end, NULL);
}

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int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
			  get_extent_t *get_extent, int mirror_num);
int __init extent_io_init(void);
void extent_io_exit(void);

u64 count_range_bits(struct extent_io_tree *tree,
		     u64 *start, u64 search_end,
		     u64 max_bytes, unsigned bits, int contig);

void free_extent_state(struct extent_state *state);
int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
		   unsigned bits, int filled,
		   struct extent_state *cached_state);
int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
		unsigned bits, struct extent_changeset *changeset);
int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
		     unsigned bits, int wake, int delete,
		     struct extent_state **cached, gfp_t mask);



static inline int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end)
{
	return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL,
				GFP_NOFS);
}

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qu wenruo
qu wenruo
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static inline int unlock_extent_cached(struct extent_io_tree *tree, u64 start,
		u64 end, struct extent_state **cached, gfp_t mask)
{
	return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached,
				mask);
}

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static inline int clear_extent_bits(struct extent_io_tree *tree, u64 start,
		u64 end, unsigned bits)
{
	int wake = 0;

	if (bits & EXTENT_LOCKED)
		wake = 1;

	return clear_extent_bit(tree, start, end, bits, wake, 0, NULL,
			GFP_NOFS);
}

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int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
			   unsigned bits, struct extent_changeset *changeset);
int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
		   unsigned bits, u64 *failed_start,
		   struct extent_state **cached_state, gfp_t mask);



static inline int set_extent_bits(struct extent_io_tree *tree, u64 start,
		u64 end, unsigned bits)
{
	return set_extent_bit(tree, start, end, bits, NULL, NULL, GFP_NOFS);
}

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static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
		u64 end, struct extent_state **cached_state, gfp_t mask)
{
	return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0,
				cached_state, mask);
}

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chris mason
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static inline int set_extent_dirty(struct extent_io_tree *tree, u64 start,
		u64 end, gfp_t mask)
{
	return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL,
			      NULL, mask);
}

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chris mason
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static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start,
		u64 end)
{
	return clear_extent_bit(tree, start, end,
				EXTENT_DIRTY | EXTENT_DELALLOC |
				EXTENT_DO_ACCOUNTING, 0, 0, NULL, GFP_NOFS);
}

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int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
		       unsigned bits, unsigned clear_bits,
		       struct extent_state **cached_state);



static inline int set_extent_delalloc(struct extent_io_tree *tree, u64 start,
		u64 end, struct extent_state **cached_state)
{
	return set_extent_bit(tree, start, end,
			      EXTENT_DELALLOC | EXTENT_UPTODATE,
			      NULL, cached_state, GFP_NOFS);
}

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static inline int set_extent_defrag(struct extent_io_tree *tree, u64 start,
		u64 end, struct extent_state **cached_state)
{
	return set_extent_bit(tree, start, end,
			      EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG,
			      NULL, cached_state, GFP_NOFS);
}

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static inline int set_extent_new(struct extent_io_tree *tree, u64 start,
		u64 end)
{
	return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, NULL,
			GFP_NOFS);
}

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static inline int set_extent_uptodate(struct extent_io_tree *tree, u64 start,
		u64 end, struct extent_state **cached_state, gfp_t mask)
{
	return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL,
			      cached_state, mask);
}

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int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
			  u64 *start_ret, u64 *end_ret, unsigned bits,
			  struct extent_state **cached_state);
int extent_invalidatepage(struct extent_io_tree *tree,
			  struct page *page, unsigned long offset);
int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
			  get_extent_t *get_extent,
			  struct writeback_control *wbc);
int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
			      u64 start, u64 end, get_extent_t *get_extent,
			      int mode);
int extent_writepages(struct extent_io_tree *tree,
		      struct address_space *mapping,
		      get_extent_t *get_extent,
		      struct writeback_control *wbc);
int btree_write_cache_pages(struct address_space *mapping,
			    struct writeback_control *wbc);
int extent_readpages(struct extent_io_tree *tree,
		     struct address_space *mapping,
		     struct list_head *pages, unsigned nr_pages,
		     get_extent_t get_extent);
int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
		__u64 start, __u64 len, get_extent_t *get_extent);
void set_page_extent_mapped(struct page *page);

struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
					  u64 start);
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(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_io_tree *tree,
			     struct extent_buffer *eb, int wait,
			     get_extent_t *get_extent, int mirror_num);
void wait_on_extent_buffer_writeback(struct extent_buffer *eb);



static inline unsigned long num_extent_pages(u64 start, u64 len)
{
	return ((start + len + PAGE_SIZE - 1) >> PAGE_SHIFT) -
		(start >> PAGE_SHIFT);
}

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kirill a. shutemov
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static inline void extent_buffer_get(struct extent_buffer *eb)
{
	atomic_inc(&eb->refs);
}

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int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
			  unsigned long start,
			  unsigned long len);
void read_extent_buffer(struct extent_buffer *eb, void *dst,
			unsigned long start,
			unsigned long len);
int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dst,
			       unsigned long start,
			       unsigned long len);
void write_extent_buffer_fsid(struct extent_buffer *eb, const void *src);
void write_extent_buffer_chunk_tree_uuid(struct extent_buffer *eb,
		const void *src);
void write_extent_buffer(struct extent_buffer *eb, const void *src,
			 unsigned long start, unsigned long len);
void copy_extent_buffer_full(struct extent_buffer *dst,
			     struct extent_buffer *src);
void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
			unsigned long dst_offset, unsigned long src_offset,
			unsigned long len);
void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
			   unsigned long src_offset, unsigned long len);
void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
			   unsigned long src_offset, unsigned long len);
void memzero_extent_buffer(struct extent_buffer *eb, unsigned long start,
			   unsigned long len);
int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
			   unsigned long pos);
void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
			      unsigned long pos, unsigned long len);
void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
				unsigned long pos, unsigned long len);
void clear_extent_buffer_dirty(struct extent_buffer *eb);
int 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_uptodate(struct extent_buffer *eb);
int extent_buffer_under_io(struct extent_buffer *eb);
int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
		      unsigned long min_len, char **map,
		      unsigned long *map_start,
		      unsigned long *map_len);
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 inode *inode, u64 start, u64 end,
				 u64 delalloc_end, struct page *locked_page,
				 unsigned bits_to_clear,
				 unsigned long page_ops);
struct bio *
btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
		gfp_t gfp_flags);
struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask);

struct btrfs_fs_info;

int repair_io_failure(struct inode *inode, u64 start, u64 length, u64 logical,
		      struct page *page, unsigned int pg_offset,
		      int mirror_num);
int clean_io_failure(struct inode *inode, u64 start, struct page *page,
		     unsigned int pg_offset);
void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
int repair_eb_io_failure(struct btrfs_fs_info *fs_info,
			 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 page 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 in_validation;
};

void btrfs_free_io_failure_record(struct inode *inode, u64 start, u64 end);
int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end,
				struct io_failure_record **failrec_ret);
int btrfs_check_repairable(struct inode *inode, struct bio *failed_bio,
			   struct io_failure_record *failrec, int fail_mirror);
struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio,
				    struct io_failure_record *failrec,
				    struct page *page, int pg_offset, int icsum,
				    bio_end_io_t *endio_func, void *data);
int free_io_failure(struct inode *inode, struct io_failure_record *rec);
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
noinline u64 find_lock_delalloc_range(struct inode *inode,
				      struct extent_io_tree *tree,
				      struct page *locked_page, u64 *start,
				      u64 *end, u64 max_bytes);
#endif
struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
					       u64 start);
#endif
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
chris mason
chris mason
1272
45.95%
33
26.61%
david sterba
david sterba
441
15.93%
25
20.16%
josef bacik
josef bacik
300
10.84%
23
18.55%
miao xie
miao xie
204
7.37%
8
6.45%
omar sandoval
omar sandoval
175
6.32%
3
2.42%
qu wenruo
qu wenruo
70
2.53%
5
4.03%
jan schmidt
jan schmidt
68
2.46%
5
4.03%
li zefan
li zefan
43
1.55%
1
0.81%
jeff mahoney
jeff mahoney
25
0.90%
4
3.23%
yehuda sadeh
yehuda sadeh
23
0.83%
1
0.81%
robin dong
robin dong
22
0.79%
1
0.81%
liu bo
liu bo
22
0.79%
1
0.81%
arne jansen
arne jansen
22
0.79%
3
2.42%
gerhard heift
gerhard heift
22
0.79%
1
0.81%
zheng yan
zheng yan
19
0.69%
3
2.42%
filipe david borba manana
filipe david borba manana
16
0.58%
2
1.61%
eric sandeen
eric sandeen
14
0.51%
1
0.81%
wang xiaoguang
wang xiaoguang
4
0.14%
1
0.81%
kirill a. shutemov
kirill a. shutemov
4
0.14%
1
0.81%
mark fasheh
mark fasheh
1
0.04%
1
0.81%
stefan behrens
stefan behrens
1
0.04%
1
0.81%
Total
2768
100.00%
124
100.00%
Directory: fs/btrfs

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