kubernetes/pkg/volume/util/volumepathhandler/volume_path_handler_linux.go

// AttachFileDevice takes a path to a regular file and makes it available as an
// attached block device.
func (v VolumePathHandler) AttachFileDevice(path string) (string, error) { … }

// DetachFileDevice takes a path to the attached block device and
// detach it from block device.
func (v VolumePathHandler) DetachFileDevice(path string) error { … }

// GetLoopDevice returns the full path to the loop device associated with the given path.
func (v VolumePathHandler) GetLoopDevice(path string) (string, error) { … }

func makeLoopDevice(path string) (string, error) { … }

// removeLoopDevice removes specified loopback device
func removeLoopDevice(device string) error { … }

// getLoopDeviceFromSysfs finds the backing file for a loop
// device from sysfs via "/sys/block/loop*/loop/backing_file".
func getLoopDeviceFromSysfs(path string) (string, error) { … }

// cleanPath remove any trailing substrings that are not part of the backing file path.
func cleanBackingFilePath(path string) string { … }

// FindGlobalMapPathUUIDFromPod finds {pod uuid} bind mount under globalMapPath
// corresponding to map path symlink, and then return global map path with pod uuid.
// (See pkg/volume/volume.go for details on a global map path and a pod device map path.)
// ex. mapPath symlink: pods/{podUid}}/{DefaultKubeletVolumeDevicesDirName}/{escapeQualifiedPluginName}/{volumeName} -> /dev/sdX
//
//	globalMapPath/{pod uuid} bind mount: plugins/kubernetes.io/{PluginName}/{DefaultKubeletVolumeDevicesDirName}/{volumePluginDependentPath}/{pod uuid} -> /dev/sdX
func (v VolumePathHandler) FindGlobalMapPathUUIDFromPod(pluginDir, mapPath string, podUID types.UID) (string, error) { … }

// compareBindMountAndSymlinks returns if global path (bind mount) and
// pod path (symlink) are pointing to the same device.
// If there is an error in checking it returns error.
func compareBindMountAndSymlinks(global, pod string) (bool, error) { … }

// getDeviceMajorMinor returns major/minor number for the path with below format:
// major:minor (in hex)
// ex)
//
//	fc:10
func getDeviceMajorMinor(path string) (string, error) { … }