mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-18 20:30:23 +00:00
443 lines
13 KiB
Go
443 lines
13 KiB
Go
/*
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Copyright 2019 The Ceph-CSI 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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package store
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import (
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"context"
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"errors"
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"fmt"
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"github.com/ceph/ceph-csi/internal/cephfs/core"
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cerrors "github.com/ceph/ceph-csi/internal/cephfs/errors"
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fsutil "github.com/ceph/ceph-csi/internal/cephfs/util"
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"github.com/ceph/ceph-csi/internal/journal"
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"github.com/ceph/ceph-csi/internal/util"
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"github.com/ceph/ceph-csi/internal/util/log"
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"github.com/golang/protobuf/ptypes/timestamp"
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)
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var (
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// VolJournal is used to maintain RADOS based journals for CO generated.
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// VolumeName to backing CephFS subvolumes.
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VolJournal *journal.Config
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// SnapJournal is used to maintain RADOS based journals for CO generated.
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// SnapshotName to backing CephFS subvolumes.
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SnapJournal *journal.Config
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)
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// VolumeIdentifier structure contains an association between the CSI VolumeID to its subvolume
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// name on the backing CephFS instance.
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type VolumeIdentifier struct {
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FsSubvolName string
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VolumeID string
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}
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type SnapshotIdentifier struct {
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FsSnapshotName string
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SnapshotID string
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RequestName string
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CreationTime *timestamp.Timestamp
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FsSubvolName string
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}
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/*
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CheckVolExists checks to determine if passed in RequestName in volOptions exists on the backend.
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**NOTE:** These functions manipulate the rados omaps that hold information regarding
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volume names as requested by the CSI drivers. Hence, these need to be invoked only when the
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respective CSI driver generated volume name based locks are held, as otherwise racy
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access to these omaps may end up leaving them in an inconsistent state.
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These functions also cleanup omap reservations that are stale. I.e when omap entries exist and
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backing subvolumes are missing, or one of the omaps exist and the next is missing. This is
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because, the order of omap creation and deletion are inverse of each other, and protected by the
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request name lock, and hence any stale omaps are leftovers from incomplete transactions and are
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hence safe to garbage collect.
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*/
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// nolint:gocognit,gocyclo,nestif,cyclop // TODO: reduce complexity
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func CheckVolExists(ctx context.Context,
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volOptions,
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parentVolOpt *VolumeOptions,
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pvID *VolumeIdentifier,
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sID *SnapshotIdentifier,
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cr *util.Credentials,
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) (*VolumeIdentifier, error) {
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var vid VolumeIdentifier
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// Connect to cephfs' default radosNamespace (csi)
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j, err := VolJournal.Connect(volOptions.Monitors, fsutil.RadosNamespace, cr)
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if err != nil {
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return nil, err
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}
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defer j.Destroy()
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imageData, err := j.CheckReservation(
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ctx, volOptions.MetadataPool, volOptions.RequestName, volOptions.NamePrefix, "", "")
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if err != nil {
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return nil, err
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}
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if imageData == nil {
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return nil, nil
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}
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imageUUID := imageData.ImageUUID
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vid.FsSubvolName = imageData.ImageAttributes.ImageName
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volOptions.VolID = vid.FsSubvolName
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vol := core.NewSubVolume(volOptions.conn, &volOptions.SubVolume, volOptions.ClusterID)
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if (sID != nil || pvID != nil) && imageData.ImageAttributes.BackingSnapshotID == "" {
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cloneState, cloneStateErr := vol.GetCloneState(ctx)
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if cloneStateErr != nil {
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if errors.Is(cloneStateErr, cerrors.ErrVolumeNotFound) {
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if pvID != nil {
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err = vol.CleanupSnapshotFromSubvolume(
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ctx, &parentVolOpt.SubVolume)
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if err != nil {
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return nil, err
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}
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}
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err = j.UndoReservation(ctx, volOptions.MetadataPool,
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volOptions.MetadataPool, vid.FsSubvolName, volOptions.RequestName)
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return nil, err
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}
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return nil, err
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}
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if cloneState == core.CephFSCloneInprogress {
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return nil, cerrors.ErrCloneInProgress
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}
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if cloneState == core.CephFSClonePending {
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return nil, cerrors.ErrClonePending
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}
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if cloneState == core.CephFSCloneFailed {
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log.ErrorLog(ctx,
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"clone failed, deleting subvolume clone. vol=%s, subvol=%s subvolgroup=%s",
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volOptions.FsName,
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vid.FsSubvolName,
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volOptions.SubvolumeGroup)
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err = vol.PurgeVolume(ctx, true)
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if err != nil {
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log.ErrorLog(ctx, "failed to delete volume %s: %v", vid.FsSubvolName, err)
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return nil, err
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}
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if pvID != nil {
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err = vol.CleanupSnapshotFromSubvolume(
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ctx, &parentVolOpt.SubVolume)
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if err != nil {
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return nil, err
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}
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}
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err = j.UndoReservation(ctx, volOptions.MetadataPool,
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volOptions.MetadataPool, vid.FsSubvolName, volOptions.RequestName)
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return nil, err
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}
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if cloneState != core.CephFSCloneComplete {
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return nil, fmt.Errorf("clone is not in complete state for %s", vid.FsSubvolName)
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}
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}
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if imageData.ImageAttributes.BackingSnapshotID == "" {
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volOptions.RootPath, err = vol.GetVolumeRootPathCeph(ctx)
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if err != nil {
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if errors.Is(err, cerrors.ErrVolumeNotFound) {
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// If the subvolume is not present, cleanup the stale snapshot
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// created for clone.
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if parentVolOpt != nil && pvID != nil {
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err = vol.CleanupSnapshotFromSubvolume(
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ctx, &parentVolOpt.SubVolume)
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if err != nil {
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return nil, err
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}
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}
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err = j.UndoReservation(ctx, volOptions.MetadataPool,
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volOptions.MetadataPool, vid.FsSubvolName, volOptions.RequestName)
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return nil, err
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}
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return nil, err
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}
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}
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// check if topology constraints match what is found
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// TODO: we need an API to fetch subvolume attributes (size/datapool and others), based
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// on which we can evaluate which topology this belongs to.
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// TODO: CephFS topology support is postponed till we get the same
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// TODO: size checks
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// found a volume already available, process and return it!
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vid.VolumeID, err = util.GenerateVolID(ctx, volOptions.Monitors, cr, volOptions.FscID,
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"", volOptions.ClusterID, imageUUID, fsutil.VolIDVersion)
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if err != nil {
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return nil, err
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}
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log.DebugLog(ctx, "Found existing volume (%s) with subvolume name (%s) for request (%s)",
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vid.VolumeID, vid.FsSubvolName, volOptions.RequestName)
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if parentVolOpt != nil && pvID != nil {
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err = vol.CleanupSnapshotFromSubvolume(
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ctx, &parentVolOpt.SubVolume)
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if err != nil {
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return nil, err
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}
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}
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return &vid, nil
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}
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// UndoVolReservation is a helper routine to undo a name reservation for a CSI VolumeName.
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func UndoVolReservation(
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ctx context.Context,
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volOptions *VolumeOptions,
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vid VolumeIdentifier,
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secret map[string]string,
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) error {
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cr, err := util.NewAdminCredentials(secret)
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if err != nil {
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return err
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}
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defer cr.DeleteCredentials()
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// Connect to cephfs' default radosNamespace (csi)
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j, err := VolJournal.Connect(volOptions.Monitors, fsutil.RadosNamespace, cr)
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if err != nil {
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return err
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}
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defer j.Destroy()
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err = j.UndoReservation(ctx, volOptions.MetadataPool,
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volOptions.MetadataPool, vid.FsSubvolName, volOptions.RequestName)
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return err
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}
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func updateTopologyConstraints(volOpts *VolumeOptions) error {
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// update request based on topology constrained parameters (if present)
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poolName, _, topology, err := util.FindPoolAndTopology(volOpts.TopologyPools, volOpts.TopologyRequirement)
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if err != nil {
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return err
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}
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if poolName != "" {
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volOpts.Pool = poolName
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volOpts.Topology = topology
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}
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return nil
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}
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// ReserveVol is a helper routine to request a UUID reservation for the CSI VolumeName and,
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// to generate the volume identifier for the reserved UUID.
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func ReserveVol(ctx context.Context, volOptions *VolumeOptions, secret map[string]string) (*VolumeIdentifier, error) {
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var (
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vid VolumeIdentifier
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imageUUID string
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err error
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)
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cr, err := util.NewAdminCredentials(secret)
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if err != nil {
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return nil, err
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}
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defer cr.DeleteCredentials()
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err = updateTopologyConstraints(volOptions)
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if err != nil {
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return nil, err
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}
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// Connect to cephfs' default radosNamespace (csi)
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j, err := VolJournal.Connect(volOptions.Monitors, fsutil.RadosNamespace, cr)
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if err != nil {
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return nil, err
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}
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defer j.Destroy()
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imageUUID, vid.FsSubvolName, err = j.ReserveName(
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ctx, volOptions.MetadataPool, util.InvalidPoolID,
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volOptions.MetadataPool, util.InvalidPoolID, volOptions.RequestName,
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volOptions.NamePrefix, "", "", volOptions.ReservedID, "", volOptions.BackingSnapshotID)
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if err != nil {
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return nil, err
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}
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volOptions.VolID = vid.FsSubvolName
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// generate the volume ID to return to the CO system
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vid.VolumeID, err = util.GenerateVolID(ctx, volOptions.Monitors, cr, volOptions.FscID,
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"", volOptions.ClusterID, imageUUID, fsutil.VolIDVersion)
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if err != nil {
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return nil, err
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}
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log.DebugLog(ctx, "Generated Volume ID (%s) and subvolume name (%s) for request name (%s)",
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vid.VolumeID, vid.FsSubvolName, volOptions.RequestName)
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return &vid, nil
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}
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// ReserveSnap is a helper routine to request a UUID reservation for the CSI SnapName and,
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// to generate the snapshot identifier for the reserved UUID.
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func ReserveSnap(
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ctx context.Context,
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volOptions *VolumeOptions,
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parentSubVolName string,
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snap *SnapshotOption,
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cr *util.Credentials,
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) (*SnapshotIdentifier, error) {
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var (
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vid SnapshotIdentifier
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imageUUID string
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err error
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)
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// Connect to cephfs' default radosNamespace (csi)
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j, err := SnapJournal.Connect(volOptions.Monitors, fsutil.RadosNamespace, cr)
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if err != nil {
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return nil, err
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}
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defer j.Destroy()
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imageUUID, vid.FsSnapshotName, err = j.ReserveName(
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ctx, volOptions.MetadataPool, util.InvalidPoolID,
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volOptions.MetadataPool, util.InvalidPoolID, snap.RequestName,
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snap.NamePrefix, parentSubVolName, "", snap.ReservedID, "", "")
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if err != nil {
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return nil, err
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}
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// generate the snapshot ID to return to the CO system
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vid.SnapshotID, err = util.GenerateVolID(ctx, volOptions.Monitors, cr, volOptions.FscID,
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"", volOptions.ClusterID, imageUUID, fsutil.VolIDVersion)
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if err != nil {
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return nil, err
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}
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log.DebugLog(ctx, "Generated Snapshot ID (%s) for request name (%s)",
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vid.SnapshotID, snap.RequestName)
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return &vid, nil
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}
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// UndoSnapReservation is a helper routine to undo a name reservation for a CSI SnapshotName.
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func UndoSnapReservation(
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ctx context.Context,
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volOptions *VolumeOptions,
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vid SnapshotIdentifier,
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snapName string,
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cr *util.Credentials,
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) error {
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// Connect to cephfs' default radosNamespace (csi)
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j, err := SnapJournal.Connect(volOptions.Monitors, fsutil.RadosNamespace, cr)
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if err != nil {
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return err
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}
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defer j.Destroy()
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err = j.UndoReservation(ctx, volOptions.MetadataPool,
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volOptions.MetadataPool, vid.FsSnapshotName, snapName)
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return err
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}
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/*
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CheckSnapExists checks to determine if passed in RequestName in volOptions exists on the backend.
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**NOTE:** These functions manipulate the rados omaps that hold information regarding
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volume names as requested by the CSI drivers. Hence, these need to be invoked only when the
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respective CSI driver generated volume name based locks are held, as otherwise racy
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access to these omaps may end up leaving them in an inconsistent state.
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These functions also cleanup omap reservations that are stale. I.e. when omap entries exist and
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backing subvolumes are missing, or one of the omaps exist and the next is missing. This is
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because, the order of omap creation and deletion are inverse of each other, and protected by the
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request name lock, and hence any stale omaps are leftovers from incomplete transactions and are
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hence safe to garbage collect.
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*/
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func CheckSnapExists(
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ctx context.Context,
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volOptions *VolumeOptions,
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snap *SnapshotOption,
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cr *util.Credentials,
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) (*SnapshotIdentifier, *core.SnapshotInfo, error) {
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// Connect to cephfs' default radosNamespace (csi)
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j, err := SnapJournal.Connect(volOptions.Monitors, fsutil.RadosNamespace, cr)
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if err != nil {
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return nil, nil, err
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}
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defer j.Destroy()
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snapData, err := j.CheckReservation(
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ctx, volOptions.MetadataPool, snap.RequestName, snap.NamePrefix, volOptions.VolID, "")
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if err != nil {
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return nil, nil, err
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}
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if snapData == nil {
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return nil, nil, nil
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}
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sid := &SnapshotIdentifier{}
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snapUUID := snapData.ImageUUID
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snapID := snapData.ImageAttributes.ImageName
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sid.FsSnapshotName = snapData.ImageAttributes.ImageName
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snapClient := core.NewSnapshot(volOptions.conn, snapID, &volOptions.SubVolume)
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snapInfo, err := snapClient.GetSnapshotInfo(ctx)
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if err != nil {
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if errors.Is(err, cerrors.ErrSnapNotFound) {
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err = j.UndoReservation(ctx, volOptions.MetadataPool,
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volOptions.MetadataPool, snapID, snap.RequestName)
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return nil, nil, err
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}
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return nil, nil, err
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}
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defer func() {
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if err != nil {
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err = snapClient.DeleteSnapshot(ctx)
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if err != nil {
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log.ErrorLog(ctx, "failed to delete snapshot %s: %v", snapID, err)
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return
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}
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err = j.UndoReservation(ctx, volOptions.MetadataPool,
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volOptions.MetadataPool, snapID, snap.RequestName)
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if err != nil {
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log.ErrorLog(ctx, "removing reservation failed for snapshot %s: %v", snapID, err)
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}
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}
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}()
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tm, err := fsutil.ParseTime(ctx, snapInfo.CreatedAt)
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if err != nil {
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return nil, nil, err
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}
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sid.CreationTime = tm
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// found a snapshot already available, process and return it!
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sid.SnapshotID, err = util.GenerateVolID(ctx, volOptions.Monitors, cr, volOptions.FscID,
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"", volOptions.ClusterID, snapUUID, fsutil.VolIDVersion)
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if err != nil {
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return nil, nil, err
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}
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log.DebugLog(ctx, "Found existing snapshot (%s) with subvolume name (%s) for request (%s)",
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snapData.ImageAttributes.RequestName, volOptions.VolID, sid.FsSnapshotName)
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return sid, &snapInfo, nil
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}
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