54 lines
1 KiB
Go
54 lines
1 KiB
Go
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//!build +unix
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package cowutils
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import (
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"errors"
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"os"
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"golang.org/x/sys/unix"
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)
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// reflink performs the actual reflink action without worrying about fallback
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func reflink(dst, src *os.File) error {
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srcFd := int(src.Fd())
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dstFd := int(dst.Fd())
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err := unix.IoctlFileClone(dstFd, srcFd)
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if err != nil && errors.Is(err, unix.ENOTSUP) {
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return ErrNotSupported
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}
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return err
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}
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func reflinkRange(dst, src *os.File, dstOffset, srcOffset, n int64) error {
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srcFd := int(src.Fd())
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dstFd := int(dst.Fd())
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req := &unix.FileCloneRange{
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Src_fd: int64(srcFd),
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Src_offset: uint64(srcOffset),
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Src_length: uint64(n),
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Dest_offset: uint64(dstOffset),
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}
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err := unix.IoctlFileCloneRange(dstFd, req)
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if err != nil && errors.Is(err, unix.ENOTSUP) {
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return ErrNotSupported
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}
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return err
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}
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func copyFileRange(dst, src *os.File, dstOffset, srcOffset, n int64) (int64, error) {
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srcFd := int(src.Fd())
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dstFd := int(dst.Fd())
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resN, err := unix.CopyFileRange(srcFd, &srcOffset, dstFd, &dstOffset, int(n), 0)
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return int64(resN), err
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}
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