mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-14 10:20:20 +00:00
142 lines
4.3 KiB
Go
142 lines
4.3 KiB
Go
/*
|
|
Copyright 2019 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"
|
|
|
|
"github.com/ceph/ceph-csi/pkg/util"
|
|
|
|
"k8s.io/klog"
|
|
)
|
|
|
|
// volumeIdentifier structure contains an association between the CSI VolumeID to its subvolume
|
|
// name on the backing CephFS instance
|
|
type volumeIdentifier struct {
|
|
FsSubvolName string
|
|
VolumeID string
|
|
}
|
|
|
|
/*
|
|
checkVolExists checks to determine if passed in RequestName in volOptions exists on the backend.
|
|
|
|
**NOTE:** These functions manipulate the rados omaps that hold information regarding
|
|
volume names as requested by the CSI drivers. Hence, these need to be invoked only when the
|
|
respective CSI driver generated volume name based locks are held, as otherwise racy
|
|
access to these omaps may end up leaving them in an inconsistent state.
|
|
|
|
These functions also cleanup omap reservations that are stale. I.e when omap entries exist and
|
|
backing subvolumes are missing, or one of the omaps exist and the next is missing. This is
|
|
because, the order of omap creation and deletion are inverse of each other, and protected by the
|
|
request name lock, and hence any stale omaps are leftovers from incomplete transactions and are
|
|
hence safe to garbage collect.
|
|
*/
|
|
func checkVolExists(ctx context.Context, volOptions *volumeOptions, secret map[string]string) (*volumeIdentifier, error) {
|
|
var (
|
|
vi util.CSIIdentifier
|
|
vid volumeIdentifier
|
|
)
|
|
|
|
cr, err := util.NewAdminCredentials(secret)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer cr.DeleteCredentials()
|
|
|
|
imageUUID, err := volJournal.CheckReservation(ctx, volOptions.Monitors, cr,
|
|
volOptions.MetadataPool, volOptions.RequestName, "")
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if imageUUID == "" {
|
|
return nil, nil
|
|
}
|
|
vid.FsSubvolName = volJournal.NamingPrefix() + imageUUID
|
|
|
|
// TODO: size checks
|
|
|
|
// found a volume already available, process and return it!
|
|
vi = util.CSIIdentifier{
|
|
LocationID: volOptions.FscID,
|
|
EncodingVersion: volIDVersion,
|
|
ClusterID: volOptions.ClusterID,
|
|
ObjectUUID: imageUUID,
|
|
}
|
|
vid.VolumeID, err = vi.ComposeCSIID()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
klog.V(4).Infof(util.Log(ctx, "Found existing volume (%s) with subvolume name (%s) for request (%s)"),
|
|
vid.VolumeID, vid.FsSubvolName, volOptions.RequestName)
|
|
|
|
return &vid, nil
|
|
}
|
|
|
|
// undoVolReservation is a helper routine to undo a name reservation for a CSI VolumeName
|
|
func undoVolReservation(ctx context.Context, volOptions *volumeOptions, vid volumeIdentifier, secret map[string]string) error {
|
|
cr, err := util.NewAdminCredentials(secret)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer cr.DeleteCredentials()
|
|
|
|
err = volJournal.UndoReservation(ctx, volOptions.Monitors, cr, volOptions.MetadataPool,
|
|
vid.FsSubvolName, volOptions.RequestName)
|
|
|
|
return err
|
|
}
|
|
|
|
// reserveVol is a helper routine to request a UUID reservation for the CSI VolumeName and,
|
|
// to generate the volume identifier for the reserved UUID
|
|
func reserveVol(ctx context.Context, volOptions *volumeOptions, secret map[string]string) (*volumeIdentifier, error) {
|
|
var (
|
|
vi util.CSIIdentifier
|
|
vid volumeIdentifier
|
|
)
|
|
|
|
cr, err := util.NewAdminCredentials(secret)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer cr.DeleteCredentials()
|
|
|
|
imageUUID, err := volJournal.ReserveName(ctx, volOptions.Monitors, cr,
|
|
volOptions.MetadataPool, volOptions.RequestName, "")
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
vid.FsSubvolName = volJournal.NamingPrefix() + imageUUID
|
|
|
|
// generate the volume ID to return to the CO system
|
|
vi = util.CSIIdentifier{
|
|
LocationID: volOptions.FscID,
|
|
EncodingVersion: volIDVersion,
|
|
ClusterID: volOptions.ClusterID,
|
|
ObjectUUID: imageUUID,
|
|
}
|
|
vid.VolumeID, err = vi.ComposeCSIID()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
klog.V(4).Infof(util.Log(ctx, "Generated Volume ID (%s) and subvolume name (%s) for request name (%s)"),
|
|
vid.VolumeID, vid.FsSubvolName, volOptions.RequestName)
|
|
|
|
return &vid, nil
|
|
}
|