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ceph-csi/internal/cephfs/nodeserver.go

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/*
Copyright 2018 The Ceph-CSI Authors.
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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 cephfs
import (
"context"
"errors"
"fmt"
"os"
"strings"
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cerrors "github.com/ceph/ceph-csi/internal/cephfs/errors"
"github.com/ceph/ceph-csi/internal/cephfs/mounter"
"github.com/ceph/ceph-csi/internal/cephfs/store"
fsutil "github.com/ceph/ceph-csi/internal/cephfs/util"
csicommon "github.com/ceph/ceph-csi/internal/csi-common"
"github.com/ceph/ceph-csi/internal/util"
"github.com/ceph/ceph-csi/internal/util/log"
"github.com/container-storage-interface/spec/lib/go/csi"
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"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
// NodeServer struct of ceph CSI driver with supported methods of CSI
// node server spec.
type NodeServer struct {
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*csicommon.DefaultNodeServer
// A map storing all volumes with ongoing operations so that additional operations
// for that same volume (as defined by VolumeID) return an Aborted error
VolumeLocks *util.VolumeLocks
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}
func getCredentialsForVolume(
volOptions *store.VolumeOptions,
secrets map[string]string) (*util.Credentials, error) {
var (
err error
cr *util.Credentials
)
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if volOptions.ProvisionVolume {
// The volume is provisioned dynamically, use passed in admin credentials
cr, err = util.NewAdminCredentials(secrets)
if err != nil {
return nil, fmt.Errorf("failed to get admin credentials from node stage secrets: %w", err)
}
} else {
// The volume is pre-made, credentials are in node stage secrets
cr, err = util.NewUserCredentials(secrets)
if err != nil {
return nil, fmt.Errorf("failed to get user credentials from node stage secrets: %w", err)
}
}
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return cr, nil
}
func (ns *NodeServer) getVolumeOptions(
ctx context.Context,
volID fsutil.VolumeID,
volContext,
volSecrets map[string]string,
) (*store.VolumeOptions, error) {
volOptions, _, err := store.NewVolumeOptionsFromVolID(ctx, string(volID), volContext, volSecrets)
if err != nil {
if !errors.Is(err, cerrors.ErrInvalidVolID) {
return nil, status.Error(codes.Internal, err.Error())
}
volOptions, _, err = store.NewVolumeOptionsFromStaticVolume(string(volID), volContext)
if err != nil {
if !errors.Is(err, cerrors.ErrNonStaticVolume) {
return nil, status.Error(codes.Internal, err.Error())
}
volOptions, _, err = store.NewVolumeOptionsFromMonitorList(string(volID), volContext, volSecrets)
if err != nil {
return nil, status.Error(codes.Internal, err.Error())
}
}
}
return volOptions, nil
}
// NodeStageVolume mounts the volume to a staging path on the node.
func (ns *NodeServer) NodeStageVolume(
ctx context.Context,
req *csi.NodeStageVolumeRequest) (*csi.NodeStageVolumeResponse, error) {
if err := util.ValidateNodeStageVolumeRequest(req); err != nil {
return nil, err
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}
// Configuration
stagingTargetPath := req.GetStagingTargetPath()
volID := fsutil.VolumeID(req.GetVolumeId())
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if acquired := ns.VolumeLocks.TryAcquire(req.GetVolumeId()); !acquired {
log.ErrorLog(ctx, util.VolumeOperationAlreadyExistsFmt, volID)
return nil, status.Errorf(codes.Aborted, util.VolumeOperationAlreadyExistsFmt, req.GetVolumeId())
}
defer ns.VolumeLocks.Release(req.GetVolumeId())
volOptions, err := ns.getVolumeOptions(ctx, volID, req.GetVolumeContext(), req.GetSecrets())
if err != nil {
return nil, status.Error(codes.Internal, err.Error())
}
defer volOptions.Destroy()
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volOptions.NetNamespaceFilePath, err = util.GetNetNamespaceFilePath(util.CsiConfigFile, volOptions.ClusterID)
if err != nil {
return nil, status.Error(codes.Internal, err.Error())
}
mnt, err := mounter.New(volOptions)
if err != nil {
log.ErrorLog(ctx, "failed to create mounter for volume %s: %v", volID, err)
Make CephFS plugin stateless reusing RADOS based journal scheme This is a part of the stateless set of commits for CephCSI. This commit removes the dependency on config maps to store cephFS provisioned volumes, and instead relies on RADOS based objects and keys, and required CSI VolumeID encoding to detect the provisioned volumes. Changes: - Provide backward compatibility to provisioned volumes by older plugin versions (1.0.0 or older) - Remove Create/Delete support for statically provisioned volumes (fixes #382) - Added namespace support to RADOS OMaps and used the same to store RADOS CSI objects and keys in the CephFS metadata pool - Added support to mention fsname for CephFS provisioning (fixes #359) - Changed field name in CSI Identifier to 'location', to denote a pool or fscid - Updated mounter cache to use new scheme - Required Helm manifests are updated - Required documentation and other manifests are updated - Made driver option 'metadatastorage' as optional, as fresh installs do not need to specify the same Testing done: - Create/Mount/Delete PVC - Create/Delete 5 PVCs - Mount version 1.0.0 PVC - Delete version 1.0.0 PV - Mount Statically defined PV/PVC/Pod - Mount Statically defined version 1.0.0 PV/PVC/Pod - Delete Statically defined version 1.0.0 PV/PVC/Pod - Node restart when mounted to test mountcache - Use InstanceID other than 'default' - RBD basic round of tests, as namespace is added to OMaps - csitest against ceph-fs plugin - NOTE: CephFS plugin still does not detect and address already created volumes but of a different size - Test not providing any value to the metadata storage parameter Signed-off-by: ShyamsundarR <srangana@redhat.com>
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return nil, status.Error(codes.Internal, err.Error())
}
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// Check if the volume is already mounted
if err = ns.tryRestoreFuseMountInNodeStage(ctx, mnt, stagingTargetPath); err != nil {
return nil, status.Errorf(codes.Internal, "failed to try to restore FUSE mounts: %v", err)
}
isMnt, err := util.IsMountPoint(stagingTargetPath)
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if err != nil {
log.ErrorLog(ctx, "stat failed: %v", err)
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return nil, status.Error(codes.Internal, err.Error())
}
if isMnt {
log.DebugLog(ctx, "cephfs: volume %s is already mounted to %s, skipping", volID, stagingTargetPath)
return &csi.NodeStageVolumeResponse{}, nil
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}
// It's not, mount now
if err = ns.mount(
ctx,
mnt,
volOptions,
fsutil.VolumeID(req.GetVolumeId()),
req.GetStagingTargetPath(),
req.GetSecrets(),
req.GetVolumeCapability(),
); err != nil {
return nil, err
}
log.DebugLog(ctx, "cephfs: successfully mounted volume %s to %s", volID, stagingTargetPath)
if _, isFuse := mnt.(*mounter.FuseMounter); isFuse {
// FUSE mount recovery needs NodeStageMountinfo records.
if err = fsutil.WriteNodeStageMountinfo(volID, &fsutil.NodeStageMountinfo{
VolumeCapability: req.GetVolumeCapability(),
Secrets: req.GetSecrets(),
}); err != nil {
log.ErrorLog(ctx, "cephfs: failed to write NodeStageMountinfo for volume %s: %v", volID, err)
// Try to clean node stage mount.
if unmountErr := mounter.UnmountVolume(ctx, stagingTargetPath); unmountErr != nil {
log.ErrorLog(ctx, "cephfs: failed to unmount %s in WriteNodeStageMountinfo clean up: %v",
stagingTargetPath, unmountErr)
}
return nil, status.Error(codes.Internal, err.Error())
}
}
return &csi.NodeStageVolumeResponse{}, nil
}
func (*NodeServer) mount(
ctx context.Context,
mnt mounter.VolumeMounter,
volOptions *store.VolumeOptions,
volID fsutil.VolumeID,
stagingTargetPath string,
secrets map[string]string,
volCap *csi.VolumeCapability,
) error {
cr, err := getCredentialsForVolume(volOptions, secrets)
if err != nil {
log.ErrorLog(ctx, "failed to get ceph credentials for volume %s: %v", volID, err)
return status.Error(codes.Internal, err.Error())
}
defer cr.DeleteCredentials()
log.DebugLog(ctx, "cephfs: mounting volume %s with %s", volID, mnt.Name())
readOnly := "ro"
if volCap.AccessMode.Mode == csi.VolumeCapability_AccessMode_MULTI_NODE_READER_ONLY ||
volCap.AccessMode.Mode == csi.VolumeCapability_AccessMode_SINGLE_NODE_READER_ONLY {
switch mnt.(type) {
case *mounter.FuseMounter:
if !csicommon.MountOptionContains(strings.Split(volOptions.FuseMountOptions, ","), readOnly) {
volOptions.FuseMountOptions = util.MountOptionsAdd(volOptions.FuseMountOptions, readOnly)
}
case *mounter.KernelMounter:
if !csicommon.MountOptionContains(strings.Split(volOptions.KernelMountOptions, ","), readOnly) {
volOptions.KernelMountOptions = util.MountOptionsAdd(volOptions.KernelMountOptions, readOnly)
}
}
}
if err = mnt.Mount(ctx, stagingTargetPath, cr, volOptions); err != nil {
log.ErrorLog(ctx,
"failed to mount volume %s: %v Check dmesg logs if required.",
volID,
err)
return status.Error(codes.Internal, err.Error())
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}
return nil
}
// NodePublishVolume mounts the volume mounted to the staging path to the target
// path.
func (ns *NodeServer) NodePublishVolume(
ctx context.Context,
req *csi.NodePublishVolumeRequest) (*csi.NodePublishVolumeResponse, error) {
mountOptions := []string{"bind", "_netdev"}
if err := util.ValidateNodePublishVolumeRequest(req); err != nil {
return nil, err
}
stagingTargetPath := req.GetStagingTargetPath()
targetPath := req.GetTargetPath()
volID := fsutil.VolumeID(req.GetVolumeId())
// Considering kubelet make sure the stage and publish operations
// are serialized, we dont need any extra locking in nodePublish
if err := util.CreateMountPoint(targetPath); err != nil {
log.ErrorLog(ctx, "failed to create mount point at %s: %v", targetPath, err)
return nil, status.Error(codes.Internal, err.Error())
}
if err := ns.tryRestoreFuseMountsInNodePublish(
ctx,
volID,
stagingTargetPath,
targetPath,
req.GetVolumeContext(),
); err != nil {
return nil, status.Errorf(codes.Internal, "failed to try to restore FUSE mounts: %v", err)
}
if req.GetReadonly() {
mountOptions = append(mountOptions, "ro")
}
mountOptions = csicommon.ConstructMountOptions(mountOptions, req.GetVolumeCapability())
// Ensure staging target path is a mountpoint.
if isMnt, err := util.IsMountPoint(stagingTargetPath); err != nil {
log.ErrorLog(ctx, "stat failed: %v", err)
return nil, status.Error(codes.Internal, err.Error())
} else if !isMnt {
return nil, status.Errorf(
codes.Internal, "staging path %s for volume %s is not a mountpoint", stagingTargetPath, volID,
)
}
// Check if the volume is already mounted
isMnt, err := util.IsMountPoint(targetPath)
if err != nil {
log.ErrorLog(ctx, "stat failed: %v", err)
return nil, status.Error(codes.Internal, err.Error())
}
if isMnt {
log.DebugLog(ctx, "cephfs: volume %s is already bind-mounted to %s", volID, targetPath)
return &csi.NodePublishVolumeResponse{}, nil
}
// It's not, mount now
if err = mounter.BindMount(
ctx,
stagingTargetPath,
targetPath,
req.GetReadonly(),
mountOptions); err != nil {
log.ErrorLog(ctx, "failed to bind-mount volume %s: %v", volID, err)
return nil, status.Error(codes.Internal, err.Error())
}
log.DebugLog(ctx, "cephfs: successfully bind-mounted volume %s to %s", volID, targetPath)
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return &csi.NodePublishVolumeResponse{}, nil
}
// NodeUnpublishVolume unmounts the volume from the target path.
func (ns *NodeServer) NodeUnpublishVolume(
ctx context.Context,
req *csi.NodeUnpublishVolumeRequest) (*csi.NodeUnpublishVolumeResponse, error) {
var err error
if err = util.ValidateNodeUnpublishVolumeRequest(req); err != nil {
return nil, err
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}
// considering kubelet make sure node operations like unpublish/unstage...etc can not be called
// at same time, an explicit locking at time of nodeunpublish is not required.
targetPath := req.GetTargetPath()
isMnt, err := util.IsMountPoint(targetPath)
if err != nil {
log.ErrorLog(ctx, "stat failed: %v", err)
if os.IsNotExist(err) {
// targetPath has already been deleted
log.DebugLog(ctx, "targetPath: %s has already been deleted", targetPath)
return &csi.NodeUnpublishVolumeResponse{}, nil
}
if !util.IsCorruptedMountError(err) {
return nil, status.Error(codes.Internal, err.Error())
}
// Corrupted mounts need to be unmounted properly too,
// regardless of the mounter used. Continue as normal.
log.DebugLog(ctx, "cephfs: detected corrupted mount in publish target path %s, trying to unmount anyway", targetPath)
isMnt = true
}
if !isMnt {
if err = os.RemoveAll(targetPath); err != nil {
return nil, status.Error(codes.Internal, err.Error())
}
return &csi.NodeUnpublishVolumeResponse{}, nil
}
// Unmount the bind-mount
if err = mounter.UnmountVolume(ctx, targetPath); err != nil {
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return nil, status.Error(codes.Internal, err.Error())
}
err = os.Remove(targetPath)
if err != nil && !os.IsNotExist(err) {
return nil, status.Error(codes.Internal, err.Error())
}
log.DebugLog(ctx, "cephfs: successfully unbounded volume %s from %s", req.GetVolumeId(), targetPath)
return &csi.NodeUnpublishVolumeResponse{}, nil
}
// NodeUnstageVolume unstages the volume from the staging path.
func (ns *NodeServer) NodeUnstageVolume(
ctx context.Context,
req *csi.NodeUnstageVolumeRequest) (*csi.NodeUnstageVolumeResponse, error) {
var err error
if err = util.ValidateNodeUnstageVolumeRequest(req); err != nil {
return nil, err
}
volID := req.GetVolumeId()
if acquired := ns.VolumeLocks.TryAcquire(volID); !acquired {
log.ErrorLog(ctx, util.VolumeOperationAlreadyExistsFmt, volID)
return nil, status.Errorf(codes.Aborted, util.VolumeOperationAlreadyExistsFmt, volID)
}
defer ns.VolumeLocks.Release(volID)
stagingTargetPath := req.GetStagingTargetPath()
if err = fsutil.RemoveNodeStageMountinfo(fsutil.VolumeID(volID)); err != nil {
log.ErrorLog(ctx, "cephfs: failed to remove NodeStageMountinfo for volume %s: %v", volID, err)
return nil, status.Error(codes.Internal, err.Error())
}
isMnt, err := util.IsMountPoint(stagingTargetPath)
if err != nil {
log.ErrorLog(ctx, "stat failed: %v", err)
if os.IsNotExist(err) {
// targetPath has already been deleted
log.DebugLog(ctx, "targetPath: %s has already been deleted", stagingTargetPath)
return &csi.NodeUnstageVolumeResponse{}, nil
}
if !util.IsCorruptedMountError(err) {
return nil, status.Error(codes.Internal, err.Error())
}
// Corrupted mounts need to be unmounted properly too,
// regardless of the mounter used. Continue as normal.
log.DebugLog(ctx,
"cephfs: detected corrupted mount in staging target path %s, trying to unmount anyway",
stagingTargetPath)
isMnt = true
}
if !isMnt {
return &csi.NodeUnstageVolumeResponse{}, nil
}
// Unmount the volume
if err = mounter.UnmountVolume(ctx, stagingTargetPath); err != nil {
return nil, status.Error(codes.Internal, err.Error())
}
log.DebugLog(ctx, "cephfs: successfully unmounted volume %s from %s", req.GetVolumeId(), stagingTargetPath)
return &csi.NodeUnstageVolumeResponse{}, nil
}
// NodeGetCapabilities returns the supported capabilities of the node server.
func (ns *NodeServer) NodeGetCapabilities(
ctx context.Context,
req *csi.NodeGetCapabilitiesRequest) (*csi.NodeGetCapabilitiesResponse, error) {
return &csi.NodeGetCapabilitiesResponse{
Capabilities: []*csi.NodeServiceCapability{
{
Type: &csi.NodeServiceCapability_Rpc{
Rpc: &csi.NodeServiceCapability_RPC{
Type: csi.NodeServiceCapability_RPC_STAGE_UNSTAGE_VOLUME,
},
},
},
{
Type: &csi.NodeServiceCapability_Rpc{
Rpc: &csi.NodeServiceCapability_RPC{
Type: csi.NodeServiceCapability_RPC_GET_VOLUME_STATS,
},
},
},
{
Type: &csi.NodeServiceCapability_Rpc{
Rpc: &csi.NodeServiceCapability_RPC{
Type: csi.NodeServiceCapability_RPC_SINGLE_NODE_MULTI_WRITER,
},
},
},
},
}, nil
}
// NodeGetVolumeStats returns volume stats.
func (ns *NodeServer) NodeGetVolumeStats(
ctx context.Context,
req *csi.NodeGetVolumeStatsRequest) (*csi.NodeGetVolumeStatsResponse, error) {
var err error
targetPath := req.GetVolumePath()
if targetPath == "" {
err = fmt.Errorf("targetpath %v is empty", targetPath)
return nil, status.Error(codes.InvalidArgument, err.Error())
}
stat, err := os.Stat(targetPath)
if err != nil {
return nil, status.Errorf(codes.InvalidArgument, "failed to get stat for targetpath %q: %v", targetPath, err)
}
if stat.Mode().IsDir() {
return csicommon.FilesystemNodeGetVolumeStats(ctx, targetPath)
}
return nil, status.Errorf(codes.InvalidArgument, "targetpath %q is not a directory or device", targetPath)
}