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fs/linux: Clone(): add implementation using copy_file_range()

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This commit is contained in:
Ivan Shapovalov 2024-12-05 17:42:04 +04:00
parent 7432d3de66
commit a323580cb6
1 changed files with 21 additions and 0 deletions
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21
internal/fs/file_linux.go
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@ -4,12 +4,14 @@
package fs
import (
"github.com/restic/restic/internal/errors"
"golang.org/x/sys/unix"
"os"
)
func init() {
registerCloneMethod(doCloneIoctl)
registerCloneMethod(doCloneCopyFileRange)
}
func withFileDescriptors(file1, file2 *os.File, fn func(fd1, fd2 int) (int, error)) (int, error) {
@ -43,3 +45,22 @@ func doCloneIoctl(src, dest *os.File) (cloned bool, err error) {
})
return true, err
}
func doCloneCopyFileRange(src, dest *os.File) (cloned bool, err error) {
srcInfo, err := src.Stat()
if err != nil {
return false, err
}
srcLength := int(srcInfo.Size())
n, err := withFileDescriptors(src, dest, func(srcFd, destFd int) (int, error) {
var srcOff, destOff int64 = 0, 0
return unix.CopyFileRange(srcFd, &srcOff, destFd, &destOff, srcLength, 0)
})
if n > 0 && n != srcLength {
return false, errors.Wrapf(err, "copy_file_range() wrote %d of %d bytes", n, srcLength)
}
// we cannot guarantee that copy_file_range() performs block cloning
return false, err
}