Golang mount.GetDeviceNameFromMount函數代碼示例

func (util *RBDUtil) DetachDisk(c rbdCleaner, mntPath string) error {
	device, cnt, err := mount.GetDeviceNameFromMount(c.mounter, mntPath)
	if err != nil {
		return fmt.Errorf("rbd detach disk: failed to get device from mnt: %s\nError: %v", mntPath, err)
	}
	if err = c.mounter.Unmount(mntPath); err != nil {
		return fmt.Errorf("rbd detach disk: failed to umount: %s\nError: %v", mntPath, err)
	}
	// if device is no longer used, see if can unmap
	if cnt <= 1 {
		// rbd unmap
		_, err = c.plugin.execCommand("rbd", []string{"unmap", device})
		if err != nil {
			return fmt.Errorf("rbd: failed to unmap device %s:Error: %v", device, err)
		}

		// load ceph and image/pool info to remove fencing
		if err := util.loadRBD(c.rbdBuilder, mntPath); err == nil {
			// remove rbd lock
			util.defencing(c)
		}

		glog.Infof("rbd: successfully unmap device %s", device)
	}
	return nil
}

func (util *ISCSIUtil) DetachDisk(c iscsiDiskUnmounter, mntPath string) error {
	_, cnt, err := mount.GetDeviceNameFromMount(c.mounter, mntPath)
	if err != nil {
		glog.Errorf("iscsi detach disk: failed to get device from mnt: %s\nError: %v", mntPath, err)
		return err
	}
	if err = c.mounter.Unmount(mntPath); err != nil {
		glog.Errorf("iscsi detach disk: failed to unmount: %s\nError: %v", mntPath, err)
		return err
	}
	cnt--
	// if device is no longer used, see if need to logout the target
	if cnt == 0 {
		device, prefix, err := extractDeviceAndPrefix(mntPath)
		if err != nil {
			return err
		}
		refCount, err := getDevicePrefixRefCount(c.mounter, prefix)

		if err == nil && refCount == 0 {
			// this portal/iqn are no longer referenced, log out
			// extract portal and iqn from device path
			portal, iqn, err := extractPortalAndIqn(device)
			if err != nil {
				return err
			}
			glog.Infof("iscsi: log out target %s iqn %s", portal, iqn)
			out, err := c.plugin.execCommand("iscsiadm", []string{"-m", "node", "-p", portal, "-T", iqn, "--logout"})
			if err != nil {
				glog.Errorf("iscsi: failed to detach disk Error: %s", string(out))
			}
		}
	}
	return nil
}

func (util *ISCSIUtil) DetachDisk(c iscsiDiskCleaner, mntPath string) error {
	device, cnt, err := mount.GetDeviceNameFromMount(c.mounter, mntPath)
	if err != nil {
		glog.Errorf("iscsi detach disk: failed to get device from mnt: %s\nError: %v", mntPath, err)
		return err
	}
	if err = c.mounter.Unmount(mntPath); err != nil {
		glog.Errorf("iscsi detach disk: failed to unmount: %s\nError: %v", mntPath, err)
		return err
	}
	cnt--
	// if device is no longer used, see if need to logout the target
	if cnt == 0 {
		// strip -lun- from device path
		ind := strings.LastIndex(device, "-lun-")
		prefix := device[:(ind - 1)]
		refCount, err := getDevicePrefixRefCount(c.mounter, prefix)

		if err == nil && refCount == 0 {
			// this portal/iqn are no longer referenced, log out
			// extract portal and iqn from device path
			ind1 := strings.LastIndex(device, "-iscsi-")
			portal := device[(len("/dev/disk/by-path/ip-")):ind1]
			iqn := device[ind1+len("-iscsi-") : ind]

			glog.Infof("iscsi: log out target %s iqn %s", portal, iqn)
			out, err := c.plugin.execCommand("iscsiadm", []string{"-m", "node", "-p", portal, "-T", iqn, "--logout"})
			if err != nil {
				glog.Errorf("iscsi: failed to detach disk Error: %s", string(out))
			}
		}
	}
	return nil
}

// TearDownAt simply deletes everything in the directory.
func (f *flexVolumeUnmounter) TearDownAt(dir string) error {
	if pathExists, pathErr := util.PathExists(dir); pathErr != nil {
		return fmt.Errorf("Error checking if path exists: %v", pathErr)
	} else if !pathExists {
		glog.Warningf("Warning: Unmount skipped because path does not exist: %v", dir)
		return nil
	}

	notmnt, err := f.mounter.IsLikelyNotMountPoint(dir)
	if err != nil {
		glog.Errorf("Error checking mount point %s, error: %v", dir, err)
		return err
	}
	if notmnt {
		return os.Remove(dir)
	}

	device, refCount, err := mount.GetDeviceNameFromMount(f.mounter, dir)
	if err != nil {
		glog.Errorf("Failed to get reference count for volume: %s", dir)
		return err
	}

	if err := f.manager.unmount(f, dir); err != nil {
		if !isCmdNotSupportedErr(err) {
			glog.Errorf("Failed to unmount volume %s", f.volName)
			return err
		}
		// Unmount not supported by the driver. Use core unmount logic.
		if err := f.mounter.Unmount(dir); err != nil {
			glog.Errorf("Failed to unmount volume: %s, error: %v", dir, err)
			return err
		}
	}

	if refCount == 1 {
		if err := f.manager.detach(f, device); err != nil {
			if !isCmdNotSupportedErr(err) {
				glog.Errorf("Failed to teardown volume: %s, error: %v", dir, err)
				return err
			}
			// Teardown not supported by driver. Unmount is good enough.
		}
	}

	notmnt, err = f.mounter.IsLikelyNotMountPoint(dir)
	if err != nil {
		glog.Errorf("Error checking mount point %s, error: %v", dir, err)
		return err
	}
	if notmnt {
		return os.Remove(dir)
	}

	return nil
}

// TearDownAt simply deletes everything in the directory.
func (f *flexVolumeCleaner) TearDownAt(dir string) error {

	notmnt, err := f.mounter.IsLikelyNotMountPoint(dir)
	if err != nil {
		glog.Errorf("Error checking mount point %s, error: %v", dir, err)
		return err
	}
	if notmnt {
		return os.Remove(dir)
	}

	device, refCount, err := mount.GetDeviceNameFromMount(f.mounter, dir)
	if err != nil {
		glog.Errorf("Failed to get reference count for volume: %s", dir)
		return err
	}

	if err := f.manager.unmount(f, dir); err != nil {
		if !isCmdNotSupportedErr(err) {
			glog.Errorf("Failed to unmount volume %s", f.volName)
			return err
		}
		// Unmount not supported by the driver. Use core unmount logic.
		if err := f.mounter.Unmount(dir); err != nil {
			glog.Errorf("Failed to unmount volume: %s, error: %s", dir, err.Error())
			return err
		}
	}

	if refCount == 1 {
		if err := f.manager.detach(f, device); err != nil {
			if !isCmdNotSupportedErr(err) {
				glog.Errorf("Failed to teardown volume: %s, error: %s", dir, err.Error())
				return err
			}
			// Teardown not supported by driver. Unmount is good enough.
		}
	}

	notmnt, err = f.mounter.IsLikelyNotMountPoint(dir)
	if err != nil {
		glog.Errorf("Error checking mount point %s, error: %v", dir, err)
		return err
	}
	if notmnt {
		return os.Remove(dir)
	}

	return nil
}