mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-25 15:50:20 +00:00
256 lines
6.8 KiB
Go
256 lines
6.8 KiB
Go
/*
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Copyright 2022 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 controller
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import (
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"context"
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"fmt"
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fscore "github.com/ceph/ceph-csi/internal/cephfs/core"
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"github.com/ceph/ceph-csi/internal/cephfs/store"
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fsutil "github.com/ceph/ceph-csi/internal/cephfs/util"
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"github.com/ceph/ceph-csi/internal/util"
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"github.com/container-storage-interface/spec/lib/go/csi"
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)
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const (
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// clusterNameKey is the key in OMAP that contains the name of the
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// NFS-cluster. It will be prefixed with the journal configuration.
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clusterNameKey = "nfs.cluster"
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)
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// NFSVolume presents the API for consumption by the CSI-controller to create,
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// modify and delete the NFS-exported CephFS volume. Instances of this struct
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// are short lived, they only exist as long as a CSI-procedure is active.
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type NFSVolume struct {
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// ctx is the context for this short living volume object
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ctx context.Context
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volumeID string
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clusterID string
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mons string
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fscID int64
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objectUUID string
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// TODO: drop in favor of a go-ceph connection
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cr *util.Credentials
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connected bool
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conn *util.ClusterConnection
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}
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// NewNFSVolume create a new NFSVolume instance for the currently executing
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// CSI-procedure.
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func NewNFSVolume(ctx context.Context, volumeID string) (*NFSVolume, error) {
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vi := util.CSIIdentifier{}
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err := vi.DecomposeCSIID(volumeID)
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if err != nil {
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return nil, fmt.Errorf("error decoding volume ID (%s): %w", volumeID, err)
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}
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return &NFSVolume{
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ctx: ctx,
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volumeID: volumeID,
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clusterID: vi.ClusterID,
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fscID: vi.LocationID,
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objectUUID: vi.ObjectUUID,
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conn: &util.ClusterConnection{},
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}, nil
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}
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// String returns a simple/short representation of the NFSVolume.
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func (nv *NFSVolume) String() string {
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return nv.volumeID
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}
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// Connect fetches cluster connection details (like MONs) and connects to the
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// Ceph cluster. This uses go-ceph, so after Connect(), Destroy() should be
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// called to cleanup resources.
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func (nv *NFSVolume) Connect(cr *util.Credentials) error {
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if nv.connected {
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return nil
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}
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var err error
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nv.mons, err = util.Mons(util.CsiConfigFile, nv.clusterID)
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if err != nil {
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return fmt.Errorf("failed to get MONs for cluster (%s): %w", nv.clusterID, err)
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}
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err = nv.conn.Connect(nv.mons, cr)
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if err != nil {
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return fmt.Errorf("failed to connect to cluster: %w", err)
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}
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nv.cr = cr
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nv.connected = true
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return nil
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}
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// Destroy cleans up resources once the NFSVolume instance is not needed
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// anymore.
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func (nv *NFSVolume) Destroy() {
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if nv.connected {
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nv.conn.Destroy()
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nv.connected = false
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}
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}
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// GetExportPath returns the path on the NFS-server that can be used for
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// mounting.
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func (nv *NFSVolume) GetExportPath() string {
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return "/" + nv.volumeID
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}
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// CreateExport takes the (CephFS) CSI-volume and instructs Ceph Mgr to create
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// a new NFS-export for the volume on the Ceph managed NFS-server.
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func (nv *NFSVolume) CreateExport(backend *csi.Volume) error {
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if !nv.connected {
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return fmt.Errorf("can not created export for %q: not connected", nv)
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}
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fs := backend.VolumeContext["fsName"]
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nfsCluster := backend.VolumeContext["nfsCluster"]
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path := backend.VolumeContext["subvolumePath"]
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err := nv.setNFSCluster(nfsCluster)
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if err != nil {
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return fmt.Errorf("failed to set NFS-cluster: %w", err)
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}
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// ceph nfs export create cephfs ${FS} ${NFS} /${EXPORT} ${SUBVOL_PATH}
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args := []string{
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"--id", nv.cr.ID,
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"--keyfile=" + nv.cr.KeyFile,
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"-m", nv.mons,
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"nfs",
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"export",
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"create",
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"cephfs",
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fs,
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nfsCluster,
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nv.GetExportPath(),
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path,
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}
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// TODO: use new go-ceph API
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_, stderr, err := util.ExecCommand(nv.ctx, "ceph", args...)
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if err != nil {
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return fmt.Errorf("executing ceph export command failed (%w): %s", err, stderr)
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}
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return nil
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}
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// DeleteExport removes the NFS-export from the Ceph managed NFS-server.
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func (nv *NFSVolume) DeleteExport() error {
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if !nv.connected {
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return fmt.Errorf("can not delete export for %q: not connected", nv)
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}
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nfsCluster, err := nv.getNFSCluster()
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if err != nil {
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return fmt.Errorf("failed to identify NFS cluster: %w", err)
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}
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// ceph nfs export rm <cluster_id> <pseudo_path>
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args := []string{
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"--id", nv.cr.ID,
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"--keyfile=" + nv.cr.KeyFile,
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"-m", nv.mons,
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"nfs",
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"export",
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"delete",
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nfsCluster,
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nv.GetExportPath(),
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}
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// TODO: use new go-ceph API
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_, stderr, err := util.ExecCommand(nv.ctx, "ceph", args...)
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if err != nil {
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return fmt.Errorf("executing ceph export command failed (%w): %s", err, stderr)
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}
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return nil
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}
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// getNFSCluster fetches the NFS-cluster name from the CephFS journal.
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func (nv *NFSVolume) getNFSCluster() (string, error) {
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if !nv.connected {
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return "", fmt.Errorf("can not get NFS-cluster for %q: not connected", nv)
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}
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fs := fscore.NewFileSystem(nv.conn)
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fsName, err := fs.GetFsName(nv.ctx, nv.fscID)
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if err != nil {
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return "", fmt.Errorf("failed to get filesystem name for ID %x: %w", nv.fscID, err)
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}
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mdPool, err := fs.GetMetadataPool(nv.ctx, fsName)
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if err != nil {
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return "", fmt.Errorf("failed to get metadata pool for %q: %w", fsName, err)
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}
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// Connect to cephfs' default radosNamespace (csi)
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j, err := store.VolJournal.Connect(nv.mons, fsutil.RadosNamespace, nv.cr)
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if err != nil {
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return "", fmt.Errorf("failed to connect to journal: %w", err)
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}
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defer j.Destroy()
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clusterName, err := j.FetchAttribute(nv.ctx, mdPool, nv.objectUUID, clusterNameKey)
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if err != nil {
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return "", fmt.Errorf("failed to get cluster name: %w", err)
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}
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return clusterName, nil
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}
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// setNFSCluster stores the NFS-cluster name in the CephFS journal.
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func (nv *NFSVolume) setNFSCluster(clusterName string) error {
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if !nv.connected {
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return fmt.Errorf("can not set NFS-cluster for %q: not connected", nv)
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}
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fs := fscore.NewFileSystem(nv.conn)
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fsName, err := fs.GetFsName(nv.ctx, nv.fscID)
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if err != nil {
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return fmt.Errorf("failed to get filesystem name for ID %x: %w", nv.fscID, err)
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}
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mdPool, err := fs.GetMetadataPool(nv.ctx, fsName)
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if err != nil {
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return fmt.Errorf("failed to get metadata pool for %q: %w", fsName, err)
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}
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// Connect to cephfs' default radosNamespace (csi)
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j, err := store.VolJournal.Connect(nv.mons, fsutil.RadosNamespace, nv.cr)
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if err != nil {
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return fmt.Errorf("failed to connect to journal: %w", err)
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}
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defer j.Destroy()
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err = j.StoreAttribute(nv.ctx, mdPool, nv.objectUUID, clusterNameKey, clusterName)
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if err != nil {
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return fmt.Errorf("failed to store cluster name: %w", err)
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}
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return nil
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}
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