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125 lines
3.5 KiB
Go
125 lines
3.5 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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//
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// diskManager interface and diskSetup/TearDown functions abtract commonly used procedures to setup a block volume
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// rbd volume implements diskManager, calls diskSetup when creating a volume, and calls diskTearDown inside volume unmounter.
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// TODO: consolidate, refactor, and share diskManager among iSCSI, GCE PD, and RBD
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//
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package rbd
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import (
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"os"
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"github.com/golang/glog"
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"k8s.io/kubernetes/pkg/util/mount"
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"k8s.io/kubernetes/pkg/volume"
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)
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// Abstract interface to disk operations.
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type diskManager interface {
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MakeGlobalPDName(disk rbd) string
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// Attaches the disk to the kubelet's host machine.
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AttachDisk(disk rbdMounter) error
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// Detaches the disk from the kubelet's host machine.
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DetachDisk(disk rbdUnmounter, mntPath string) error
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}
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// utility to mount a disk based filesystem
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func diskSetUp(manager diskManager, b rbdMounter, volPath string, mounter mount.Interface, fsGroup *int64) error {
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globalPDPath := manager.MakeGlobalPDName(*b.rbd)
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// TODO: handle failed mounts here.
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notMnt, err := mounter.IsLikelyNotMountPoint(volPath)
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if err != nil && !os.IsNotExist(err) {
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glog.Errorf("cannot validate mountpoint: %s", volPath)
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return err
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}
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if !notMnt {
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return nil
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}
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if err := manager.AttachDisk(b); err != nil {
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glog.Errorf("failed to attach disk")
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return err
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}
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if err := os.MkdirAll(volPath, 0750); err != nil {
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glog.Errorf("failed to mkdir:%s", volPath)
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return err
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}
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// Perform a bind mount to the full path to allow duplicate mounts of the same disk.
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options := []string{"bind"}
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if (&b).GetAttributes().ReadOnly {
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options = append(options, "ro")
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}
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err = mounter.Mount(globalPDPath, volPath, "", options)
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if err != nil {
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glog.Errorf("failed to bind mount:%s", globalPDPath)
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return err
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}
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if !b.ReadOnly {
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volume.SetVolumeOwnership(&b, fsGroup)
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}
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return nil
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}
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// utility to tear down a disk based filesystem
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func diskTearDown(manager diskManager, c rbdUnmounter, volPath string, mounter mount.Interface) error {
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notMnt, err := mounter.IsLikelyNotMountPoint(volPath)
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if err != nil {
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glog.Errorf("cannot validate mountpoint %s", volPath)
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return err
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}
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if notMnt {
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return os.Remove(volPath)
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}
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refs, err := mount.GetMountRefs(mounter, volPath)
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if err != nil {
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glog.Errorf("failed to get reference count %s", volPath)
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return err
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}
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if err := mounter.Unmount(volPath); err != nil {
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glog.Errorf("failed to umount %s", volPath)
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return err
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}
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// If len(refs) is 1, then all bind mounts have been removed, and the
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// remaining reference is the global mount. It is safe to detach.
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if len(refs) == 1 {
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mntPath := refs[0]
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if err := manager.DetachDisk(c, mntPath); err != nil {
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glog.Errorf("failed to detach disk from %s", mntPath)
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return err
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}
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}
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notMnt, mntErr := mounter.IsLikelyNotMountPoint(volPath)
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if mntErr != nil {
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glog.Errorf("IsLikelyNotMountPoint check failed: %v", mntErr)
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return err
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}
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if notMnt {
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if err := os.Remove(volPath); err != nil {
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return err
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}
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}
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return nil
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}
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