CopyDirs copies all directories, subdirectories and files recursively including the empty folders.

Fdatasync is similar to fsync(), but does not flush modified metadata unless that metadata is needed in order to allow a subsequent data retrieval to be correctly handled.

Flock locks the file with the provided name.

OpenDir opens a directory for syncing.

Preallocate tries to allocate the space for given file.

Rename safely renames a file.

Replace moves a file or directory to a new location and deletes any previous data.

Releaser provides the Release method to release a file lock.