ceph-csi/internal/cephfs/controllerserver.go
Prasanna Kumar Kalever 5f36f7e8bd cephfs: update subvolume snapshot metadata if snapshot already exists.
Make sure to set metadata when subvolume snapshot exist, i.e. if the
provisioner pod is restarted while createSnapShot is in progress, say it
created the subvolume snapshot but didn't yet set the metadata.

Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>
2022-07-28 19:37:23 +00:00

1102 lines
35 KiB
Go

/*
Copyright 2018 The Ceph-CSI 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 cephfs
import (
"context"
"errors"
"fmt"
"github.com/ceph/ceph-csi/internal/cephfs/core"
cerrors "github.com/ceph/ceph-csi/internal/cephfs/errors"
"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/k8s"
"github.com/ceph/ceph-csi/internal/util/log"
rterrors "github.com/ceph/ceph-csi/internal/util/reftracker/errors"
"github.com/container-storage-interface/spec/lib/go/csi"
"github.com/golang/protobuf/ptypes/timestamp"
"github.com/kubernetes-csi/csi-lib-utils/protosanitizer"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
// ControllerServer struct of CEPH CSI driver with supported methods of CSI
// controller server spec.
type ControllerServer struct {
*csicommon.DefaultControllerServer
// A map storing all volumes with ongoing operations so that additional operations
// for that same volume (as defined by VolumeID/volume name) return an Aborted error
VolumeLocks *util.VolumeLocks
// A map storing all snapshots with ongoing operations so that additional operations
// for that same snapshot (as defined by SnapshotID/snapshot name) return an Aborted error
SnapshotLocks *util.VolumeLocks
// A map storing all volumes/snapshots with ongoing operations.
OperationLocks *util.OperationLock
// Cluster name
ClusterName string
}
// createBackingVolume creates the backing subvolume and on any error cleans up any created entities.
func (cs *ControllerServer) createBackingVolume(
ctx context.Context,
volOptions,
parentVolOpt *store.VolumeOptions,
pvID *store.VolumeIdentifier,
sID *store.SnapshotIdentifier,
) error {
var err error
volClient := core.NewSubVolume(volOptions.GetConnection(),
&volOptions.SubVolume, volOptions.ClusterID, cs.ClusterName)
if sID != nil {
return cs.createBackingVolumeFromSnapshotSource(ctx, volOptions, parentVolOpt, volClient, sID)
}
if parentVolOpt != nil {
return cs.createBackingVolumeFromVolumeSource(ctx, parentVolOpt, volClient, pvID)
}
if err = volClient.CreateVolume(ctx); err != nil {
log.ErrorLog(ctx, "failed to create volume %s: %v", volOptions.RequestName, err)
return status.Error(codes.Internal, err.Error())
}
return nil
}
func (cs *ControllerServer) createBackingVolumeFromSnapshotSource(
ctx context.Context,
volOptions *store.VolumeOptions,
parentVolOpt *store.VolumeOptions,
volClient core.SubVolumeClient,
sID *store.SnapshotIdentifier,
) error {
if err := cs.OperationLocks.GetRestoreLock(sID.SnapshotID); err != nil {
log.ErrorLog(ctx, err.Error())
return status.Error(codes.Aborted, err.Error())
}
defer cs.OperationLocks.ReleaseRestoreLock(sID.SnapshotID)
if volOptions.BackingSnapshot {
if err := store.AddSnapshotBackedVolumeRef(ctx, volOptions, cs.ClusterName); err != nil {
log.ErrorLog(ctx, "failed to create snapshot-backed volume from snapshot %s: %v",
sID.FsSnapshotName, err)
return err
}
return nil
}
err := volClient.CreateCloneFromSnapshot(ctx, core.Snapshot{
SnapshotID: sID.FsSnapshotName,
SubVolume: &parentVolOpt.SubVolume,
})
if err != nil {
log.ErrorLog(ctx, "failed to create clone from snapshot %s: %v", sID.FsSnapshotName, err)
return err
}
return nil
}
func (cs *ControllerServer) createBackingVolumeFromVolumeSource(
ctx context.Context,
parentVolOpt *store.VolumeOptions,
volClient core.SubVolumeClient,
pvID *store.VolumeIdentifier,
) error {
if err := cs.OperationLocks.GetCloneLock(pvID.VolumeID); err != nil {
log.ErrorLog(ctx, err.Error())
return status.Error(codes.Aborted, err.Error())
}
defer cs.OperationLocks.ReleaseCloneLock(pvID.VolumeID)
if err := volClient.CreateCloneFromSubvolume(ctx, &parentVolOpt.SubVolume); err != nil {
log.ErrorLog(ctx, "failed to create clone from subvolume %s: %v", fsutil.VolumeID(pvID.FsSubvolName), err)
return err
}
return nil
}
func checkContentSource(
ctx context.Context,
req *csi.CreateVolumeRequest,
cr *util.Credentials,
clusterName string,
) (*store.VolumeOptions, *store.VolumeIdentifier, *store.SnapshotIdentifier, error) {
if req.VolumeContentSource == nil {
return nil, nil, nil, nil
}
volumeSource := req.VolumeContentSource
switch volumeSource.Type.(type) {
case *csi.VolumeContentSource_Snapshot:
snapshotID := req.VolumeContentSource.GetSnapshot().GetSnapshotId()
volOpt, _, sid, err := store.NewSnapshotOptionsFromID(ctx, snapshotID, cr, clusterName)
if err != nil {
if errors.Is(err, cerrors.ErrSnapNotFound) {
return nil, nil, nil, status.Error(codes.NotFound, err.Error())
}
return nil, nil, nil, status.Error(codes.Internal, err.Error())
}
return volOpt, nil, sid, nil
case *csi.VolumeContentSource_Volume:
// Find the volume using the provided VolumeID
volID := req.VolumeContentSource.GetVolume().GetVolumeId()
parentVol, pvID, err := store.NewVolumeOptionsFromVolID(ctx, volID, nil, req.Secrets, clusterName)
if err != nil {
if !errors.Is(err, cerrors.ErrVolumeNotFound) {
return nil, nil, nil, status.Error(codes.NotFound, err.Error())
}
return nil, nil, nil, status.Error(codes.Internal, err.Error())
}
return parentVol, pvID, nil, nil
}
return nil, nil, nil, status.Errorf(codes.InvalidArgument, "not a proper volume source %v", volumeSource)
}
// checkValidCreateVolumeRequest checks if the request is valid
// CreateVolumeRequest by inspecting the request parameters.
func checkValidCreateVolumeRequest(
vol,
parentVol *store.VolumeOptions,
pvID *store.VolumeIdentifier,
sID *store.SnapshotIdentifier,
req *csi.CreateVolumeRequest,
) error {
switch {
case pvID != nil:
if vol.Size < parentVol.Size {
return fmt.Errorf(
"cannot clone from volume %s: volume size %d is smaller than source volume size %d",
pvID.VolumeID,
parentVol.Size,
vol.Size)
}
if vol.BackingSnapshot {
return errors.New("cloning snapshot-backed volumes is currently not supported")
}
case sID != nil:
if vol.BackingSnapshot {
volCaps := req.GetVolumeCapabilities()
for _, volCap := range volCaps {
mode := volCap.AccessMode.Mode
if mode != csi.VolumeCapability_AccessMode_MULTI_NODE_READER_ONLY &&
mode != csi.VolumeCapability_AccessMode_SINGLE_NODE_READER_ONLY {
return errors.New("backingSnapshot may be used only with read-only access modes")
}
}
}
}
return nil
}
// CreateVolume creates a reservation and the volume in backend, if it is not already present.
// nolint:gocognit,gocyclo,nestif,cyclop // TODO: reduce complexity
func (cs *ControllerServer) CreateVolume(
ctx context.Context,
req *csi.CreateVolumeRequest,
) (*csi.CreateVolumeResponse, error) {
if err := cs.validateCreateVolumeRequest(req); err != nil {
log.ErrorLog(ctx, "CreateVolumeRequest validation failed: %v", err)
return nil, err
}
// Configuration
secret := req.GetSecrets()
requestName := req.GetName()
cr, err := util.NewAdminCredentials(secret)
if err != nil {
log.ErrorLog(ctx, "failed to retrieve admin credentials: %v", err)
return nil, status.Error(codes.InvalidArgument, err.Error())
}
defer cr.DeleteCredentials()
// Existence and conflict checks
if acquired := cs.VolumeLocks.TryAcquire(requestName); !acquired {
log.ErrorLog(ctx, util.VolumeOperationAlreadyExistsFmt, requestName)
return nil, status.Errorf(codes.Aborted, util.VolumeOperationAlreadyExistsFmt, requestName)
}
defer cs.VolumeLocks.Release(requestName)
volOptions, err := store.NewVolumeOptions(ctx, requestName, cs.ClusterName, req, cr)
if err != nil {
log.ErrorLog(ctx, "validation and extraction of volume options failed: %v", err)
return nil, status.Error(codes.InvalidArgument, err.Error())
}
defer volOptions.Destroy()
if req.GetCapacityRange() != nil {
volOptions.Size = util.RoundOffCephFSVolSize(req.GetCapacityRange().GetRequiredBytes())
}
parentVol, pvID, sID, err := checkContentSource(ctx, req, cr, cs.ClusterName)
if err != nil {
return nil, err
}
if parentVol != nil {
defer parentVol.Destroy()
}
err = checkValidCreateVolumeRequest(volOptions, parentVol, pvID, sID, req)
if err != nil {
return nil, status.Error(codes.InvalidArgument, err.Error())
}
vID, err := store.CheckVolExists(ctx, volOptions, parentVol, pvID, sID, cr, cs.ClusterName)
if err != nil {
if cerrors.IsCloneRetryError(err) {
return nil, status.Error(codes.Aborted, err.Error())
}
return nil, status.Error(codes.Internal, err.Error())
}
// TODO return error message if requested vol size greater than found volume return error
metadata := k8s.GetVolumeMetadata(req.GetParameters())
if vID != nil {
volClient := core.NewSubVolume(volOptions.GetConnection(), &volOptions.SubVolume,
volOptions.ClusterID, cs.ClusterName)
if sID != nil || pvID != nil && !volOptions.BackingSnapshot {
err = volClient.ExpandVolume(ctx, volOptions.Size)
if err != nil {
purgeErr := volClient.PurgeVolume(ctx, false)
if purgeErr != nil {
log.ErrorLog(ctx, "failed to delete volume %s: %v", requestName, purgeErr)
// All errors other than ErrVolumeNotFound should return an error back to the caller
if !errors.Is(purgeErr, cerrors.ErrVolumeNotFound) {
return nil, status.Error(codes.Internal, purgeErr.Error())
}
}
errUndo := store.UndoVolReservation(ctx, volOptions, *vID, secret)
if errUndo != nil {
log.WarningLog(ctx, "failed undoing reservation of volume: %s (%s)",
requestName, errUndo)
}
log.ErrorLog(ctx, "failed to expand volume %s: %v", fsutil.VolumeID(vID.FsSubvolName), err)
return nil, status.Error(codes.Internal, err.Error())
}
}
if !volOptions.BackingSnapshot {
// Set metadata on restart of provisioner pod when subvolume exist
err = volClient.SetAllMetadata(metadata)
if err != nil {
return nil, status.Error(codes.Internal, err.Error())
}
}
// remove kubernetes csi prefixed parameters.
volumeContext := k8s.RemoveCSIPrefixedParameters(req.GetParameters())
volumeContext["subvolumeName"] = vID.FsSubvolName
volumeContext["subvolumePath"] = volOptions.RootPath
volume := &csi.Volume{
VolumeId: vID.VolumeID,
CapacityBytes: volOptions.Size,
ContentSource: req.GetVolumeContentSource(),
VolumeContext: volumeContext,
}
if volOptions.Topology != nil {
volume.AccessibleTopology = []*csi.Topology{
{
Segments: volOptions.Topology,
},
}
}
return &csi.CreateVolumeResponse{Volume: volume}, nil
}
// Reservation
vID, err = store.ReserveVol(ctx, volOptions, secret)
if err != nil {
return nil, status.Error(codes.Internal, err.Error())
}
defer func() {
if err != nil {
if !cerrors.IsCloneRetryError(err) {
errDefer := store.UndoVolReservation(ctx, volOptions, *vID, secret)
if errDefer != nil {
log.WarningLog(ctx, "failed undoing reservation of volume: %s (%s)",
requestName, errDefer)
}
}
}
}()
// Create a volume
err = cs.createBackingVolume(ctx, volOptions, parentVol, pvID, sID)
if err != nil {
if cerrors.IsCloneRetryError(err) {
return nil, status.Error(codes.Aborted, err.Error())
}
return nil, err
}
volClient := core.NewSubVolume(volOptions.GetConnection(),
&volOptions.SubVolume, volOptions.ClusterID, cs.ClusterName)
if !volOptions.BackingSnapshot {
// Get root path for the created subvolume.
// Note that root path for snapshot-backed volumes has been already set when
// building VolumeOptions.
volOptions.RootPath, err = volClient.GetVolumeRootPathCeph(ctx)
if err != nil {
purgeErr := volClient.PurgeVolume(ctx, true)
if purgeErr != nil {
log.ErrorLog(ctx, "failed to delete volume %s: %v", vID.FsSubvolName, purgeErr)
// All errors other than ErrVolumeNotFound should return an error back to the caller
if !errors.Is(purgeErr, cerrors.ErrVolumeNotFound) {
// If the subvolume deletion is failed, we should not cleanup
// the OMAP entry it will stale subvolume in cluster.
// set err=nil so that when we get the request again we can get
// the subvolume info.
err = nil
return nil, status.Error(codes.Internal, purgeErr.Error())
}
}
log.ErrorLog(ctx, "failed to get subvolume path %s: %v", vID.FsSubvolName, err)
return nil, status.Error(codes.Internal, err.Error())
}
// Set Metadata on PV Create
err = volClient.SetAllMetadata(metadata)
if err != nil {
return nil, status.Error(codes.Internal, err.Error())
}
}
log.DebugLog(ctx, "cephfs: successfully created backing volume named %s for request name %s",
vID.FsSubvolName, requestName)
// remove kubernetes csi prefixed parameters.
volumeContext := k8s.RemoveCSIPrefixedParameters(req.GetParameters())
volumeContext["subvolumeName"] = vID.FsSubvolName
volumeContext["subvolumePath"] = volOptions.RootPath
volume := &csi.Volume{
VolumeId: vID.VolumeID,
CapacityBytes: volOptions.Size,
ContentSource: req.GetVolumeContentSource(),
VolumeContext: volumeContext,
}
if volOptions.Topology != nil {
volume.AccessibleTopology = []*csi.Topology{
{
Segments: volOptions.Topology,
},
}
}
return &csi.CreateVolumeResponse{Volume: volume}, nil
}
// DeleteVolume deletes the volume in backend and its reservation.
func (cs *ControllerServer) DeleteVolume(
ctx context.Context,
req *csi.DeleteVolumeRequest,
) (*csi.DeleteVolumeResponse, error) {
if err := cs.validateDeleteVolumeRequest(); err != nil {
log.ErrorLog(ctx, "DeleteVolumeRequest validation failed: %v", err)
return nil, err
}
volID := fsutil.VolumeID(req.GetVolumeId())
secrets := req.GetSecrets()
// lock out parallel delete operations
if acquired := cs.VolumeLocks.TryAcquire(string(volID)); !acquired {
log.ErrorLog(ctx, util.VolumeOperationAlreadyExistsFmt, volID)
return nil, status.Errorf(codes.Aborted, util.VolumeOperationAlreadyExistsFmt, string(volID))
}
defer cs.VolumeLocks.Release(string(volID))
// lock out volumeID for clone and expand operation
if err := cs.OperationLocks.GetDeleteLock(req.GetVolumeId()); err != nil {
log.ErrorLog(ctx, err.Error())
return nil, status.Error(codes.Aborted, err.Error())
}
defer cs.OperationLocks.ReleaseDeleteLock(req.GetVolumeId())
// Find the volume using the provided VolumeID
volOptions, vID, err := store.NewVolumeOptionsFromVolID(ctx, string(volID), nil, secrets, cs.ClusterName)
if err != nil {
// if error is ErrPoolNotFound, the pool is already deleted we dont
// need to worry about deleting subvolume or omap data, return success
if errors.Is(err, util.ErrPoolNotFound) {
log.WarningLog(ctx, "failed to get backend volume for %s: %v", string(volID), err)
return &csi.DeleteVolumeResponse{}, nil
}
// if error is ErrKeyNotFound, then a previous attempt at deletion was complete
// or partially complete (subvolume and imageOMap are garbage collected already), hence
// return success as deletion is complete
if errors.Is(err, util.ErrKeyNotFound) {
return &csi.DeleteVolumeResponse{}, nil
}
log.ErrorLog(ctx, "Error returned from newVolumeOptionsFromVolID: %v", err)
// All errors other than ErrVolumeNotFound should return an error back to the caller
if !errors.Is(err, cerrors.ErrVolumeNotFound) {
return nil, status.Error(codes.Internal, err.Error())
}
// If error is ErrImageNotFound then we failed to find the subvolume, but found the imageOMap
// to lead us to the image, hence the imageOMap needs to be garbage collected, by calling
// unreserve for the same
if acquired := cs.VolumeLocks.TryAcquire(volOptions.RequestName); !acquired {
return nil, status.Errorf(codes.Aborted, util.VolumeOperationAlreadyExistsFmt, volOptions.RequestName)
}
defer cs.VolumeLocks.Release(volOptions.RequestName)
if err = store.UndoVolReservation(ctx, volOptions, *vID, secrets); err != nil {
return nil, status.Error(codes.Internal, err.Error())
}
return &csi.DeleteVolumeResponse{}, nil
}
defer volOptions.Destroy()
// lock out parallel delete and create requests against the same volume name as we
// cleanup the subvolume and associated omaps for the same
if acquired := cs.VolumeLocks.TryAcquire(volOptions.RequestName); !acquired {
return nil, status.Errorf(codes.Aborted, util.VolumeOperationAlreadyExistsFmt, volOptions.RequestName)
}
defer cs.VolumeLocks.Release(volOptions.RequestName)
// Deleting a volume requires admin credentials
cr, err := util.NewAdminCredentials(secrets)
if err != nil {
log.ErrorLog(ctx, "failed to retrieve admin credentials: %v", err)
return nil, status.Error(codes.InvalidArgument, err.Error())
}
defer cr.DeleteCredentials()
if err := cleanUpBackingVolume(ctx, volOptions, vID, cr, cs.ClusterName); err != nil {
return nil, err
}
if err := store.UndoVolReservation(ctx, volOptions, *vID, secrets); err != nil {
return nil, status.Error(codes.Internal, err.Error())
}
log.DebugLog(ctx, "cephfs: successfully deleted volume %s", volID)
return &csi.DeleteVolumeResponse{}, nil
}
func cleanUpBackingVolume(
ctx context.Context,
volOptions *store.VolumeOptions,
volID *store.VolumeIdentifier,
cr *util.Credentials,
clusterName string,
) error {
if !volOptions.BackingSnapshot {
// Regular volumes need to be purged.
volClient := core.NewSubVolume(volOptions.GetConnection(),
&volOptions.SubVolume, volOptions.ClusterID, clusterName)
if err := volClient.PurgeVolume(ctx, false); err != nil {
log.ErrorLog(ctx, "failed to delete volume %s: %v", volID, err)
if errors.Is(err, cerrors.ErrVolumeHasSnapshots) {
return status.Error(codes.FailedPrecondition, err.Error())
}
if !errors.Is(err, cerrors.ErrVolumeNotFound) {
return status.Error(codes.Internal, err.Error())
}
}
return nil
}
// Snapshot-backed volumes need to un-reference the backing snapshot, and
// the snapshot itself may need to be deleted if its reftracker doesn't
// hold any references anymore.
backingSnapNeedsDelete, err := store.UnrefSnapshotBackedVolume(ctx, volOptions)
if err != nil {
if errors.Is(err, rterrors.ErrObjectOutOfDate) {
return status.Error(codes.Aborted, err.Error())
}
return status.Error(codes.Internal, err.Error())
}
if !backingSnapNeedsDelete {
return nil
}
snapParentVolOptions, _, snapID, err := store.NewSnapshotOptionsFromID(ctx,
volOptions.BackingSnapshotID, cr, clusterName)
if err != nil {
absorbErrs := []error{
util.ErrPoolNotFound,
util.ErrKeyNotFound,
cerrors.ErrSnapNotFound,
cerrors.ErrVolumeNotFound,
}
fatalErr := true
for i := range absorbErrs {
if errors.Is(err, absorbErrs[i]) {
fatalErr = false
break
}
}
if fatalErr {
return status.Error(codes.Internal, err.Error())
}
} else {
snapClient := core.NewSnapshot(
snapParentVolOptions.GetConnection(),
snapID.FsSnapshotName,
&snapParentVolOptions.SubVolume,
)
err = deleteSnapshotAndUndoReservation(ctx, snapClient, snapParentVolOptions, snapID, cr)
if err != nil {
return status.Error(codes.Internal, err.Error())
}
}
return nil
}
// ValidateVolumeCapabilities checks whether the volume capabilities requested
// are supported.
func (cs *ControllerServer) ValidateVolumeCapabilities(
ctx context.Context,
req *csi.ValidateVolumeCapabilitiesRequest,
) (*csi.ValidateVolumeCapabilitiesResponse, error) {
// Cephfs doesn't support Block volume
for _, capability := range req.VolumeCapabilities {
if capability.GetBlock() != nil {
return &csi.ValidateVolumeCapabilitiesResponse{Message: ""}, nil
}
}
return &csi.ValidateVolumeCapabilitiesResponse{
Confirmed: &csi.ValidateVolumeCapabilitiesResponse_Confirmed{
VolumeCapabilities: req.VolumeCapabilities,
},
}, nil
}
// ControllerExpandVolume expands CephFS Volumes on demand based on resizer request.
func (cs *ControllerServer) ControllerExpandVolume(
ctx context.Context,
req *csi.ControllerExpandVolumeRequest,
) (*csi.ControllerExpandVolumeResponse, error) {
if err := cs.validateExpandVolumeRequest(req); err != nil {
log.ErrorLog(ctx, "ControllerExpandVolumeRequest validation failed: %v", err)
return nil, err
}
volID := req.GetVolumeId()
secret := req.GetSecrets()
// lock out parallel delete operations
if acquired := cs.VolumeLocks.TryAcquire(volID); !acquired {
log.ErrorLog(ctx, util.VolumeOperationAlreadyExistsFmt, volID)
return nil, status.Errorf(codes.Aborted, util.VolumeOperationAlreadyExistsFmt, volID)
}
defer cs.VolumeLocks.Release(volID)
// lock out volumeID for clone and delete operation
if err := cs.OperationLocks.GetExpandLock(volID); err != nil {
log.ErrorLog(ctx, err.Error())
return nil, status.Error(codes.Aborted, err.Error())
}
defer cs.OperationLocks.ReleaseExpandLock(volID)
cr, err := util.NewAdminCredentials(secret)
if err != nil {
return nil, status.Error(codes.InvalidArgument, err.Error())
}
defer cr.DeleteCredentials()
volOptions, volIdentifier, err := store.NewVolumeOptionsFromVolID(ctx, volID, nil, secret, cs.ClusterName)
if err != nil {
log.ErrorLog(ctx, "validation and extraction of volume options failed: %v", err)
return nil, status.Error(codes.InvalidArgument, err.Error())
}
defer volOptions.Destroy()
if volOptions.BackingSnapshot {
return nil, status.Error(codes.InvalidArgument, "cannot expand snapshot-backed volume")
}
RoundOffSize := util.RoundOffCephFSVolSize(req.GetCapacityRange().GetRequiredBytes())
volClient := core.NewSubVolume(volOptions.GetConnection(),
&volOptions.SubVolume, volOptions.ClusterID, cs.ClusterName)
if err = volClient.ResizeVolume(ctx, RoundOffSize); err != nil {
log.ErrorLog(ctx, "failed to expand volume %s: %v", fsutil.VolumeID(volIdentifier.FsSubvolName), err)
return nil, status.Error(codes.Internal, err.Error())
}
return &csi.ControllerExpandVolumeResponse{
CapacityBytes: RoundOffSize,
NodeExpansionRequired: false,
}, nil
}
// CreateSnapshot creates the snapshot in backend and stores metadata
// in store
// nolint:gocognit,gocyclo,cyclop // golangci-lint did not catch this earlier, needs to get fixed late
func (cs *ControllerServer) CreateSnapshot(
ctx context.Context,
req *csi.CreateSnapshotRequest,
) (*csi.CreateSnapshotResponse, error) {
if err := cs.validateSnapshotReq(ctx, req); err != nil {
return nil, err
}
cr, err := util.NewAdminCredentials(req.GetSecrets())
if err != nil {
return nil, err
}
defer cr.DeleteCredentials()
clusterData, err := store.GetClusterInformation(req.GetParameters())
if err != nil {
return nil, status.Error(codes.Internal, err.Error())
}
requestName := req.GetName()
sourceVolID := req.GetSourceVolumeId()
// Existence and conflict checks
if acquired := cs.SnapshotLocks.TryAcquire(requestName); !acquired {
log.ErrorLog(ctx, util.SnapshotOperationAlreadyExistsFmt, requestName)
return nil, status.Errorf(codes.Aborted, util.SnapshotOperationAlreadyExistsFmt, requestName)
}
defer cs.SnapshotLocks.Release(requestName)
if err = cs.OperationLocks.GetSnapshotCreateLock(sourceVolID); err != nil {
log.ErrorLog(ctx, err.Error())
return nil, status.Error(codes.Aborted, err.Error())
}
defer cs.OperationLocks.ReleaseSnapshotCreateLock(sourceVolID)
// Find the volume using the provided VolumeID
parentVolOptions, vid, err := store.NewVolumeOptionsFromVolID(ctx,
sourceVolID, nil, req.GetSecrets(), cs.ClusterName)
if err != nil {
if errors.Is(err, util.ErrPoolNotFound) {
log.WarningLog(ctx, "failed to get backend volume for %s: %v", sourceVolID, err)
return nil, status.Error(codes.NotFound, err.Error())
}
if errors.Is(err, cerrors.ErrVolumeNotFound) {
return nil, status.Error(codes.NotFound, err.Error())
}
return nil, status.Error(codes.Internal, err.Error())
}
defer parentVolOptions.Destroy()
if clusterData.ClusterID != parentVolOptions.ClusterID {
return nil, status.Errorf(
codes.InvalidArgument,
"requested cluster id %s not matching subvolume cluster id %s",
clusterData.ClusterID,
parentVolOptions.ClusterID)
}
if parentVolOptions.BackingSnapshot {
return nil, status.Error(codes.InvalidArgument, "cannot snapshot a snapshot-backed volume")
}
cephfsSnap, genSnapErr := store.GenSnapFromOptions(ctx, req)
if genSnapErr != nil {
return nil, status.Error(codes.Internal, genSnapErr.Error())
}
// lock out parallel snapshot create operations
if acquired := cs.VolumeLocks.TryAcquire(sourceVolID); !acquired {
log.ErrorLog(ctx, util.VolumeOperationAlreadyExistsFmt, sourceVolID)
return nil, status.Errorf(codes.Aborted, util.VolumeOperationAlreadyExistsFmt, sourceVolID)
}
defer cs.VolumeLocks.Release(sourceVolID)
snapName := req.GetName()
sid, snapInfo, err := store.CheckSnapExists(ctx, parentVolOptions, cephfsSnap, cr)
if err != nil {
return nil, status.Error(codes.Internal, err.Error())
}
// check are we able to retrieve the size of parent
// ceph fs subvolume info command got added in 14.2.10 and 15.+
// as we are not able to retrieve the parent size we are rejecting the
// request to create snapshot.
// TODO: For this purpose we could make use of cached clusterAdditionalInfo
// too.
volClient := core.NewSubVolume(parentVolOptions.GetConnection(),
&parentVolOptions.SubVolume,
parentVolOptions.ClusterID,
cs.ClusterName)
info, err := volClient.GetSubVolumeInfo(ctx)
if err != nil {
// Check error code value against ErrInvalidCommand to understand the cluster
// support it or not, It's safe to evaluate as the filtering
// is already done from GetSubVolumeInfo() and send out the error here.
if errors.Is(err, cerrors.ErrInvalidCommand) {
return nil, status.Error(
codes.FailedPrecondition,
"subvolume info command not supported in current ceph cluster")
}
if sid != nil {
errDefer := store.UndoSnapReservation(ctx, parentVolOptions, *sid, snapName, cr)
if errDefer != nil {
log.WarningLog(ctx, "failed undoing reservation of snapshot: %s (%s)",
requestName, errDefer)
}
}
return nil, status.Error(codes.Internal, err.Error())
}
metadata := k8s.GetSnapshotMetadata(req.GetParameters())
if sid != nil {
// check snapshot is protected
protected := true
snapClient := core.NewSnapshot(parentVolOptions.GetConnection(), sid.FsSnapshotName, &parentVolOptions.SubVolume)
if !(snapInfo.Protected == core.SnapshotIsProtected) {
err = snapClient.ProtectSnapshot(ctx)
if err != nil {
protected = false
log.WarningLog(ctx, "failed to protect snapshot of snapshot: %s (%s)",
sid.FsSnapshotName, err)
}
}
// Update snapshot-name/snapshot-namespace/snapshotcontent-name details on
// subvolume snapshot as metadata in case snapshot already exist
if len(metadata) != 0 {
err = snapClient.SetAllSnapshotMetadata(metadata)
if err != nil {
return nil, status.Error(codes.Internal, err.Error())
}
}
return &csi.CreateSnapshotResponse{
Snapshot: &csi.Snapshot{
SizeBytes: info.BytesQuota,
SnapshotId: sid.SnapshotID,
SourceVolumeId: req.GetSourceVolumeId(),
CreationTime: sid.CreationTime,
ReadyToUse: protected,
},
}, nil
}
// Reservation
sID, err := store.ReserveSnap(ctx, parentVolOptions, vid.FsSubvolName, cephfsSnap, cr)
if err != nil {
return nil, status.Error(codes.Internal, err.Error())
}
defer func() {
if err != nil {
errDefer := store.UndoSnapReservation(ctx, parentVolOptions, *sID, snapName, cr)
if errDefer != nil {
log.WarningLog(ctx, "failed undoing reservation of snapshot: %s (%s)",
requestName, errDefer)
}
}
}()
snap, err := doSnapshot(ctx, parentVolOptions, sID.FsSnapshotName, metadata)
if err != nil {
return nil, status.Error(codes.Internal, err.Error())
}
return &csi.CreateSnapshotResponse{
Snapshot: &csi.Snapshot{
SizeBytes: info.BytesQuota,
SnapshotId: sID.SnapshotID,
SourceVolumeId: req.GetSourceVolumeId(),
CreationTime: snap.CreationTime,
ReadyToUse: true,
},
}, nil
}
func doSnapshot(
ctx context.Context,
volOpt *store.VolumeOptions,
snapshotName string,
metadata map[string]string,
) (core.SnapshotInfo, error) {
snapID := fsutil.VolumeID(snapshotName)
snap := core.SnapshotInfo{}
snapClient := core.NewSnapshot(volOpt.GetConnection(), snapshotName, &volOpt.SubVolume)
err := snapClient.CreateSnapshot(ctx)
if err != nil {
log.ErrorLog(ctx, "failed to create snapshot %s %v", snapID, err)
return snap, err
}
defer func() {
if err != nil {
dErr := snapClient.DeleteSnapshot(ctx)
if dErr != nil {
log.ErrorLog(ctx, "failed to delete snapshot %s %v", snapID, err)
}
}
}()
snap, err = snapClient.GetSnapshotInfo(ctx)
if err != nil {
log.ErrorLog(ctx, "failed to get snapshot info %s %v", snapID, err)
return snap, fmt.Errorf("failed to get snapshot info for snapshot:%s", snapID)
}
var t *timestamp.Timestamp
t, err = fsutil.ParseTime(ctx, snap.CreatedAt)
if err != nil {
return snap, err
}
snap.CreationTime = t
err = snapClient.ProtectSnapshot(ctx)
if err != nil {
log.ErrorLog(ctx, "failed to protect snapshot %s %v", snapID, err)
}
// Set snapshot-name/snapshot-namespace/snapshotcontent-name details
// on subvolume snapshot as metadata on create
if len(metadata) != 0 {
err = snapClient.SetAllSnapshotMetadata(metadata)
if err != nil {
return snap, err
}
}
return snap, err
}
func (cs *ControllerServer) validateSnapshotReq(ctx context.Context, req *csi.CreateSnapshotRequest) error {
if err := cs.Driver.ValidateControllerServiceRequest(
csi.ControllerServiceCapability_RPC_CREATE_DELETE_SNAPSHOT); err != nil {
log.ErrorLog(ctx, "invalid create snapshot req: %v", protosanitizer.StripSecrets(req))
return err
}
// Check sanity of request Snapshot Name, Source Volume Id
if req.Name == "" {
return status.Error(codes.NotFound, "snapshot Name cannot be empty")
}
if req.SourceVolumeId == "" {
return status.Error(codes.NotFound, "source Volume ID cannot be empty")
}
return nil
}
// DeleteSnapshot deletes the snapshot in backend and removes the
// snapshot metadata from store.
// nolint:gocyclo,cyclop // TODO: reduce complexity
func (cs *ControllerServer) DeleteSnapshot(
ctx context.Context,
req *csi.DeleteSnapshotRequest,
) (*csi.DeleteSnapshotResponse, error) {
if err := cs.Driver.ValidateControllerServiceRequest(
csi.ControllerServiceCapability_RPC_CREATE_DELETE_SNAPSHOT); err != nil {
log.ErrorLog(ctx, "invalid delete snapshot req: %v", protosanitizer.StripSecrets(req))
return nil, err
}
cr, err := util.NewAdminCredentials(req.GetSecrets())
if err != nil {
return nil, status.Error(codes.InvalidArgument, err.Error())
}
defer cr.DeleteCredentials()
snapshotID := req.GetSnapshotId()
if snapshotID == "" {
return nil, status.Error(codes.InvalidArgument, "snapshot ID cannot be empty")
}
if acquired := cs.SnapshotLocks.TryAcquire(snapshotID); !acquired {
log.ErrorLog(ctx, util.SnapshotOperationAlreadyExistsFmt, snapshotID)
return nil, status.Errorf(codes.Aborted, util.SnapshotOperationAlreadyExistsFmt, snapshotID)
}
defer cs.SnapshotLocks.Release(snapshotID)
// lock out snapshotID for restore operation
if err = cs.OperationLocks.GetDeleteLock(snapshotID); err != nil {
log.ErrorLog(ctx, err.Error())
return nil, status.Error(codes.Aborted, err.Error())
}
defer cs.OperationLocks.ReleaseDeleteLock(snapshotID)
volOpt, snapInfo, sid, err := store.NewSnapshotOptionsFromID(ctx, snapshotID, cr, cs.ClusterName)
if err != nil {
switch {
case errors.Is(err, util.ErrPoolNotFound):
// if error is ErrPoolNotFound, the pool is already deleted we dont
// need to worry about deleting snapshot or omap data, return success
log.WarningLog(ctx, "failed to get backend snapshot for %s: %v", snapshotID, err)
return &csi.DeleteSnapshotResponse{}, nil
case errors.Is(err, util.ErrKeyNotFound):
// if error is ErrKeyNotFound, then a previous attempt at deletion was complete
// or partially complete (snap and snapOMap are garbage collected already), hence return
// success as deletion is complete
return &csi.DeleteSnapshotResponse{}, nil
case errors.Is(err, cerrors.ErrSnapNotFound):
err = store.UndoSnapReservation(ctx, volOpt, *sid, sid.RequestName, cr)
if err != nil {
log.ErrorLog(ctx, "failed to remove reservation for snapname (%s) with backing snap (%s) (%s)",
sid.RequestName, sid.FsSnapshotName, err)
return nil, status.Error(codes.Internal, err.Error())
}
return &csi.DeleteSnapshotResponse{}, nil
case errors.Is(err, cerrors.ErrVolumeNotFound):
// if the error is ErrVolumeNotFound, the subvolume is already deleted
// from backend, Hence undo the omap entries and return success
log.ErrorLog(ctx, "Volume not present")
err = store.UndoSnapReservation(ctx, volOpt, *sid, sid.RequestName, cr)
if err != nil {
log.ErrorLog(ctx, "failed to remove reservation for snapname (%s) with backing snap (%s) (%s)",
sid.RequestName, sid.FsSnapshotName, err)
return nil, status.Error(codes.Internal, err.Error())
}
return &csi.DeleteSnapshotResponse{}, nil
default:
return nil, status.Error(codes.Internal, err.Error())
}
}
defer volOpt.Destroy()
// safeguard against parallel create or delete requests against the same
// name
if acquired := cs.SnapshotLocks.TryAcquire(sid.RequestName); !acquired {
log.ErrorLog(ctx, util.SnapshotOperationAlreadyExistsFmt, sid.RequestName)
return nil, status.Errorf(codes.Aborted, util.VolumeOperationAlreadyExistsFmt, sid.RequestName)
}
defer cs.SnapshotLocks.Release(sid.RequestName)
if snapInfo.HasPendingClones == "yes" {
return nil, status.Errorf(codes.FailedPrecondition, "snapshot %s has pending clones", snapshotID)
}
snapClient := core.NewSnapshot(volOpt.GetConnection(), sid.FsSnapshotName, &volOpt.SubVolume)
if snapInfo.Protected == core.SnapshotIsProtected {
err = snapClient.UnprotectSnapshot(ctx)
if err != nil {
return nil, status.Error(codes.Internal, err.Error())
}
}
needsDelete, err := store.UnrefSelfInSnapshotBackedVolumes(ctx, volOpt, sid.SnapshotID)
if err != nil {
if errors.Is(err, rterrors.ErrObjectOutOfDate) {
return nil, status.Error(codes.Aborted, err.Error())
}
return nil, status.Error(codes.Internal, err.Error())
}
if needsDelete {
err = deleteSnapshotAndUndoReservation(
ctx,
snapClient,
volOpt,
sid,
cr,
)
if err != nil {
return nil, status.Error(codes.Internal, err.Error())
}
}
return &csi.DeleteSnapshotResponse{}, nil
}
func deleteSnapshotAndUndoReservation(
ctx context.Context,
snapClient core.SnapshotClient,
parentVolOptions *store.VolumeOptions,
snapID *store.SnapshotIdentifier,
cr *util.Credentials,
) error {
err := snapClient.DeleteSnapshot(ctx)
if err != nil {
return err
}
err = store.UndoSnapReservation(ctx, parentVolOptions, *snapID, snapID.RequestName, cr)
if err != nil {
log.ErrorLog(ctx, "failed to remove reservation for snapname (%s) with backing snap (%s) (%s)",
snapID.RequestName, snapID.RequestName, err)
return err
}
return nil
}