cowutils

Documentation

Index

• Variables
• func DedupeFiles(ctx context.Context, paths []string) (deduped uint64, err error)
• func Reflink(ctx context.Context, dst, src *os.File, fallback bool) error
• func ReflinkRange(ctx context.Context, dst, src *os.File, dstOffset, srcOffset, n int64, ...) error

Variables

var (
	ErrNotSupported = errors.New("cow is not supported on this OS")
	ErrFailed       = errors.New("cow is not supported on this OS or file")
	ErrTooSmall     = errors.New("file is too smaller then filesystem block size")
)

ErrNotSupported is returned by Always() if the operation is not supported on the current operating system. Auto() will never return this error.

Functions

func DedupeFiles

func DedupeFiles(ctx context.Context, paths []string) (deduped uint64, err error)

func Reflink

func Reflink(ctx context.Context, dst, src *os.File, fallback bool) error

Reflink performs the reflink operation on the passed files, replacing dst's contents with src. If fallback is true and reflink fails, copy_file_range will be used first, and if that fails too io.Copy will be used to copy the data.

func ReflinkRange

func ReflinkRange(ctx context.Context, dst, src *os.File, dstOffset, srcOffset, n int64, fallback bool) error

ReflinkRange performs a range reflink operation on the passed files, replacing part of dst's contents with data from src. If fallback is true and reflink fails, copy_file_range will be used first, and if that fails too io.CopyN will be used to copy the data.