ba0d275f3b
1) Modify rbdPlugin to implement volume.AttachableVolumePlugin interface. 2) Add rbdAttacher/rbdDetacher structs to implement volume.Attacher/Detacher interfaces. 3) Add mount.SafeFormatAndMount/mount.Exec fields to rbdPlugin, and setup them in rbdPlugin.Init for later uses. Attacher/Mounter/Unmounter/Detacher reference rbdPlugin to use mounter and exec. This simplifies code. 4) Add testcase struct to abstract RBD Plugin test case, etc. 5) Add newRBD constructor to unify rbd struct initialization.
127 lines
4.0 KiB
Go
127 lines
4.0 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 abstract 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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"fmt"
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"os"
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"github.com/golang/glog"
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"k8s.io/api/core/v1"
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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 creates global persistent disk path.
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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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// If it successfully attaches, the path to the device
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// is returned. Otherwise, an error will be returned.
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AttachDisk(disk rbdMounter) (string, error)
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// Detaches the disk from the kubelet's host machine.
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DetachDisk(plugin *rbdPlugin, deviceMountPath string, device string) error
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// Creates a rbd image.
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CreateImage(provisioner *rbdVolumeProvisioner) (r *v1.RBDPersistentVolumeSource, volumeSizeGB int, err error)
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// Deletes a rbd image.
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DeleteImage(deleter *rbdVolumeDeleter) 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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notMnt, err := mounter.IsLikelyNotMountPoint(globalPDPath)
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if err != nil && !os.IsNotExist(err) {
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glog.Errorf("cannot validate mountpoint: %s", globalPDPath)
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return err
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}
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if notMnt {
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return fmt.Errorf("no device is mounted at %s", globalPDPath)
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}
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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 := 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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mountOptions := volume.JoinMountOptions(b.mountOptions, options)
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err = mounter.Mount(globalPDPath, volPath, "", mountOptions)
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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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glog.V(3).Infof("rbd: successfully bind mount %s to %s with options %v", globalPDPath, volPath, mountOptions)
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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 && !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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glog.V(3).Infof("volume path %s is not a mountpoint, deleting", volPath)
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return os.Remove(volPath)
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}
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// Unmount the bind-mount inside this pod.
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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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notMnt, mntErr := mounter.IsLikelyNotMountPoint(volPath)
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if err != nil && !os.IsNotExist(err) {
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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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glog.V(2).Info("Error removing mountpoint ", volPath, ": ", err)
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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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