mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-21 04:20:23 +00:00
296 lines
9.3 KiB
Go
296 lines
9.3 KiB
Go
/*
|
|
Copyright 2018 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package rbd
|
|
|
|
import (
|
|
"fmt"
|
|
"os"
|
|
"os/exec"
|
|
"regexp"
|
|
"strings"
|
|
|
|
"golang.org/x/net/context"
|
|
"k8s.io/klog"
|
|
|
|
"github.com/container-storage-interface/spec/lib/go/csi"
|
|
"google.golang.org/grpc/codes"
|
|
"google.golang.org/grpc/status"
|
|
|
|
"k8s.io/kubernetes/pkg/util/mount"
|
|
|
|
"github.com/kubernetes-csi/drivers/pkg/csi-common"
|
|
)
|
|
|
|
// NodeServer struct of ceph rbd driver with supported methods of CSI
|
|
// node server spec
|
|
type NodeServer struct {
|
|
*csicommon.DefaultNodeServer
|
|
mounter mount.Interface
|
|
}
|
|
|
|
//TODO remove both stage and unstage methods
|
|
//once https://github.com/kubernetes-csi/drivers/pull/145 is merged
|
|
|
|
// NodeStageVolume returns unimplemented response
|
|
func (ns *NodeServer) NodeStageVolume(ctx context.Context, req *csi.NodeStageVolumeRequest) (*csi.NodeStageVolumeResponse, error) {
|
|
return nil, status.Error(codes.Unimplemented, "")
|
|
}
|
|
|
|
// NodeUnstageVolume returns unimplemented response
|
|
func (ns *NodeServer) NodeUnstageVolume(ctx context.Context, req *csi.NodeUnstageVolumeRequest) (*csi.NodeUnstageVolumeResponse, error) {
|
|
return nil, status.Error(codes.Unimplemented, "")
|
|
}
|
|
|
|
// NodePublishVolume mounts the volume mounted to the device path to the target
|
|
// path
|
|
func (ns *NodeServer) NodePublishVolume(ctx context.Context, req *csi.NodePublishVolumeRequest) (*csi.NodePublishVolumeResponse, error) {
|
|
targetPath := req.GetTargetPath()
|
|
targetPathMutex.LockKey(targetPath)
|
|
|
|
defer func() {
|
|
if err := targetPathMutex.UnlockKey(targetPath); err != nil {
|
|
klog.Warningf("failed to unlock mutex targetpath:%s %v", targetPath, err)
|
|
}
|
|
}()
|
|
|
|
volName, err := ns.getVolumeName(req)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
isBlock := req.GetVolumeCapability().GetBlock() != nil
|
|
// Check if that target path exists properly
|
|
notMnt, err := ns.createTargetPath(targetPath, isBlock)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if !notMnt {
|
|
return &csi.NodePublishVolumeResponse{}, nil
|
|
}
|
|
volOptions, err := getRBDVolumeOptions(req.GetVolumeContext())
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
volOptions.VolName = volName
|
|
// Mapping RBD image
|
|
devicePath, err := attachRBDImage(volOptions, volOptions.UserID, req.GetSecrets())
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
klog.V(4).Infof("rbd image: %s/%s was successfully mapped at %s\n", req.GetVolumeId(), volOptions.Pool, devicePath)
|
|
|
|
// Publish Path
|
|
err = ns.mountVolume(req, devicePath)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &csi.NodePublishVolumeResponse{}, nil
|
|
}
|
|
|
|
func (ns *NodeServer) getVolumeName(req *csi.NodePublishVolumeRequest) (string, error) {
|
|
var volName string
|
|
isBlock := req.GetVolumeCapability().GetBlock() != nil
|
|
targetPath := req.GetTargetPath()
|
|
if isBlock {
|
|
// Get volName from targetPath
|
|
s := strings.Split(targetPath, "/")
|
|
volName = s[len(s)-1]
|
|
} else {
|
|
// Get volName from targetPath
|
|
if !strings.HasSuffix(targetPath, "/mount") {
|
|
return "", fmt.Errorf("rbd: malformed the value of target path: %s", targetPath)
|
|
}
|
|
s := strings.Split(strings.TrimSuffix(targetPath, "/mount"), "/")
|
|
volName = s[len(s)-1]
|
|
}
|
|
return volName, nil
|
|
}
|
|
|
|
func (ns *NodeServer) mountVolume(req *csi.NodePublishVolumeRequest, devicePath string) error {
|
|
// Publish Path
|
|
fsType := req.GetVolumeCapability().GetMount().GetFsType()
|
|
readOnly := req.GetReadonly()
|
|
attrib := req.GetVolumeContext()
|
|
mountFlags := req.GetVolumeCapability().GetMount().GetMountFlags()
|
|
isBlock := req.GetVolumeCapability().GetBlock() != nil
|
|
targetPath := req.GetTargetPath()
|
|
|
|
klog.V(4).Infof("target %v\nisBlock %v\nfstype %v\ndevice %v\nreadonly %v\nattributes %v\n mountflags %v\n",
|
|
targetPath, isBlock, fsType, devicePath, readOnly, attrib, mountFlags)
|
|
|
|
diskMounter := &mount.SafeFormatAndMount{Interface: ns.mounter, Exec: mount.NewOsExec()}
|
|
if isBlock {
|
|
options := []string{"bind"}
|
|
if err := diskMounter.Mount(devicePath, targetPath, fsType, options); err != nil {
|
|
return err
|
|
}
|
|
} else {
|
|
options := []string{}
|
|
if readOnly {
|
|
options = append(options, "ro")
|
|
}
|
|
|
|
if err := diskMounter.FormatAndMount(devicePath, targetPath, fsType, options); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (ns *NodeServer) createTargetPath(targetPath string, isBlock bool) (bool, error) {
|
|
// Check if that target path exists properly
|
|
notMnt, err := ns.mounter.IsNotMountPoint(targetPath)
|
|
if err != nil {
|
|
if os.IsNotExist(err) {
|
|
if isBlock {
|
|
// create an empty file
|
|
// #nosec
|
|
targetPathFile, e := os.OpenFile(targetPath, os.O_CREATE|os.O_RDWR, 0750)
|
|
if e != nil {
|
|
klog.V(4).Infof("Failed to create targetPath:%s with error: %v", targetPath, err)
|
|
return notMnt, status.Error(codes.Internal, e.Error())
|
|
}
|
|
if err = targetPathFile.Close(); err != nil {
|
|
klog.V(4).Infof("Failed to close targetPath:%s with error: %v", targetPath, err)
|
|
return notMnt, status.Error(codes.Internal, err.Error())
|
|
}
|
|
} else {
|
|
// Create a directory
|
|
if err = os.MkdirAll(targetPath, 0750); err != nil {
|
|
return notMnt, status.Error(codes.Internal, err.Error())
|
|
}
|
|
}
|
|
notMnt = true
|
|
} else {
|
|
return false, status.Error(codes.Internal, err.Error())
|
|
}
|
|
}
|
|
return notMnt, err
|
|
|
|
}
|
|
|
|
// NodeUnpublishVolume unmounts the volume from the target path
|
|
func (ns *NodeServer) NodeUnpublishVolume(ctx context.Context, req *csi.NodeUnpublishVolumeRequest) (*csi.NodeUnpublishVolumeResponse, error) {
|
|
targetPath := req.GetTargetPath()
|
|
targetPathMutex.LockKey(targetPath)
|
|
|
|
defer func() {
|
|
if err := targetPathMutex.UnlockKey(targetPath); err != nil {
|
|
klog.Warningf("failed to unlock mutex targetpath:%s %v", targetPath, err)
|
|
}
|
|
}()
|
|
|
|
notMnt, err := ns.mounter.IsNotMountPoint(targetPath)
|
|
if err != nil {
|
|
if os.IsNotExist(err) {
|
|
// targetPath has already been deleted
|
|
klog.V(4).Infof("targetPath: %s has already been deleted", targetPath)
|
|
return &csi.NodeUnpublishVolumeResponse{}, nil
|
|
}
|
|
return nil, status.Error(codes.NotFound, err.Error())
|
|
}
|
|
if notMnt {
|
|
// TODO should consider deleting path instead of returning error,
|
|
// once all codes become ready for csi 1.0.
|
|
return nil, status.Error(codes.NotFound, "Volume not mounted")
|
|
}
|
|
|
|
devicePath, cnt, err := mount.GetDeviceNameFromMount(ns.mounter, targetPath)
|
|
if err != nil {
|
|
return nil, status.Error(codes.Internal, err.Error())
|
|
}
|
|
|
|
if err = ns.unmount(targetPath, devicePath, cnt); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return &csi.NodeUnpublishVolumeResponse{}, nil
|
|
}
|
|
|
|
func (ns *NodeServer) unmount(targetPath, devicePath string, cnt int) error {
|
|
var err error
|
|
// Bind mounted device needs to be resolved by using resolveBindMountedBlockDevice
|
|
if devicePath == "devtmpfs" {
|
|
devicePath, err = resolveBindMountedBlockDevice(targetPath)
|
|
if err != nil {
|
|
return status.Error(codes.Internal, err.Error())
|
|
}
|
|
klog.V(4).Infof("NodeUnpublishVolume: devicePath: %s, (original)cnt: %d\n", devicePath, cnt)
|
|
// cnt for GetDeviceNameFromMount is broken for bind mouted device,
|
|
// it counts total number of mounted "devtmpfs", instead of counting this device.
|
|
// So, forcibly setting cnt to 1 here.
|
|
// TODO : fix this properly
|
|
cnt = 1
|
|
}
|
|
|
|
klog.V(4).Infof("NodeUnpublishVolume: targetPath: %s, devicePath: %s\n", targetPath, devicePath)
|
|
|
|
// Unmounting the image
|
|
err = ns.mounter.Unmount(targetPath)
|
|
if err != nil {
|
|
klog.V(3).Infof("failed to unmount targetPath: %s with error: %v", targetPath, err)
|
|
return status.Error(codes.Internal, err.Error())
|
|
}
|
|
|
|
cnt--
|
|
if cnt != 0 {
|
|
// TODO should this be fixed not to success, so that driver can retry unmounting?
|
|
return nil
|
|
}
|
|
|
|
// Unmapping rbd device
|
|
if err = detachRBDDevice(devicePath); err != nil {
|
|
klog.V(3).Infof("failed to unmap rbd device: %s with error: %v", devicePath, err)
|
|
return err
|
|
}
|
|
|
|
// Remove targetPath
|
|
if err = os.RemoveAll(targetPath); err != nil {
|
|
klog.V(3).Infof("failed to remove targetPath: %s with error: %v", targetPath, err)
|
|
}
|
|
return err
|
|
}
|
|
func resolveBindMountedBlockDevice(mountPath string) (string, error) {
|
|
// #nosec
|
|
cmd := exec.Command("findmnt", "-n", "-o", "SOURCE", "--first-only", "--target", mountPath)
|
|
out, err := cmd.CombinedOutput()
|
|
if err != nil {
|
|
klog.V(2).Infof("Failed findmnt command for path %s: %s %v", mountPath, out, err)
|
|
return "", err
|
|
}
|
|
return parseFindMntResolveSource(string(out))
|
|
}
|
|
|
|
// parse output of "findmnt -o SOURCE --first-only --target" and return just the SOURCE
|
|
func parseFindMntResolveSource(out string) (string, error) {
|
|
// cut trailing newline
|
|
out = strings.TrimSuffix(out, "\n")
|
|
// Check if out is a mounted device
|
|
reMnt := regexp.MustCompile("^(/[^/]+(?:/[^/]*)*)$")
|
|
if match := reMnt.FindStringSubmatch(out); match != nil {
|
|
return match[1], nil
|
|
}
|
|
// Check if out is a block device
|
|
// nolint
|
|
reBlk := regexp.MustCompile("^devtmpfs\\[(/[^/]+(?:/[^/]*)*)\\]$")
|
|
if match := reBlk.FindStringSubmatch(out); match != nil {
|
|
return fmt.Sprintf("/dev%s", match[1]), nil
|
|
}
|
|
return "", fmt.Errorf("parseFindMntResolveSource: %s doesn't match to any expected findMnt output", out)
|
|
}
|