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https://github.com/ceph/ceph-csi.git
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cephfs/volume: create/delete-volume idempotency checks
This commit is contained in:
gman
parent
5c6bf5fa1a
commit
60588d8968
@ -17,11 +17,11 @@ limitations under the License.
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package cephfs
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import (
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"bytes"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"os/exec"
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"google.golang.org/grpc/codes"
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@ -30,61 +30,41 @@ import (
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"github.com/ceph/ceph-csi/pkg/util"
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"github.com/container-storage-interface/spec/lib/go/csi"
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"k8s.io/kubernetes/pkg/util/keymutex"
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"k8s.io/kubernetes/pkg/util/mount"
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)
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type volumeID string
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func mustUnlock(m keymutex.KeyMutex, key string) {
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if err := m.UnlockKey(key); err != nil {
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klog.Fatalf("failed to unlock mutex for %s: %v", key, err)
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}
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}
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func makeVolumeID(volName string) volumeID {
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return volumeID("csi-cephfs-" + volName)
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}
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func closePipeOnError(pipe io.Closer, err error) {
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if err != nil {
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if err = pipe.Close(); err != nil {
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klog.Warningf("failed to close pipe: %v", err)
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}
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}
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}
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func execCommand(program string, args ...string) (stdout, stderr []byte, err error) {
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cmd := exec.Command(program, args...) // nolint: gosec
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stripArgs := util.StripSecretInArgs(args)
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klog.V(4).Infof("cephfs: EXEC %s %s", program, stripArgs)
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var (
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cmd = exec.Command(program, args...) // nolint: gosec
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sanitizedArgs = util.StripSecretInArgs(args)
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stdoutBuf bytes.Buffer
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stderrBuf bytes.Buffer
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)
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stdoutPipe, err := cmd.StdoutPipe()
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if err != nil {
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return nil, nil, fmt.Errorf("cannot open stdout pipe for %s %v: %v", program, stripArgs, err)
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cmd.Stdout = &stdoutBuf
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cmd.Stderr = &stderrBuf
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klog.V(4).Infof("cephfs: EXEC %s %s", program, sanitizedArgs)
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if err := cmd.Run(); err != nil {
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return nil, nil, fmt.Errorf("an error occurred while running (%d) %s %v: %v: %s",
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cmd.Process.Pid, program, sanitizedArgs, err, stderrBuf.Bytes())
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}
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defer closePipeOnError(stdoutPipe, err)
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stderrPipe, err := cmd.StderrPipe()
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if err != nil {
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return nil, nil, fmt.Errorf("cannot open stdout pipe for %s %v: %v", program, stripArgs, err)
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}
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defer closePipeOnError(stderrPipe, err)
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if err = cmd.Start(); err != nil {
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return nil, nil, fmt.Errorf("failed to run %s %v: %v", program, stripArgs, err)
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}
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stdout, err = ioutil.ReadAll(stdoutPipe)
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if err != nil {
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return nil, nil, fmt.Errorf("failed to read from stdout for %s %v: %v", program, stripArgs, err)
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}
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stderr, err = ioutil.ReadAll(stderrPipe)
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if err != nil {
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return nil, nil, fmt.Errorf("failed to read from stderr for %s %v: %v", program, stripArgs, err)
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}
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if waitErr := cmd.Wait(); waitErr != nil {
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return nil, nil, fmt.Errorf("an error occurred while running %s %v: %v: %s", program, stripArgs, waitErr, stderr)
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}
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return
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return stdoutBuf.Bytes(), stderrBuf.Bytes(), nil
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}
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func execCommandErr(program string, args ...string) error {
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@ -117,6 +97,11 @@ func isMountPoint(p string) (bool, error) {
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return !notMnt, nil
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}
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func pathExists(p string) bool {
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_, err := os.Stat(p)
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return err == nil
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}
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// Controller service request validation
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func (cs *ControllerServer) validateCreateVolumeRequest(req *csi.CreateVolumeRequest) error {
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if err := cs.Driver.ValidateControllerServiceRequest(csi.ControllerServiceCapability_RPC_CREATE_DELETE_VOLUME); err != nil {
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@ -52,79 +52,66 @@ func setVolumeAttribute(root, attrName, attrValue string) error {
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}
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func createVolume(volOptions *volumeOptions, adminCr *credentials, volID volumeID, bytesQuota int64) error {
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cephRoot := getCephRootPathLocal(volID)
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if err := createMountPoint(cephRoot); err != nil {
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if err := mountCephRoot(volID, volOptions, adminCr); err != nil {
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return err
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}
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defer unmountCephRoot(volID)
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// RootPath is not set for a dynamically provisioned volume
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// Access to cephfs's / is required
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volOptions.RootPath = "/"
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var (
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volRoot = getCephRootVolumePathLocal(volID)
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volRootCreating = volRoot + "-creating"
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)
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m, err := newMounter(volOptions)
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if err != nil {
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return fmt.Errorf("failed to create mounter: %v", err)
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if pathExists(volRoot) {
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klog.V(4).Infof("cephfs: volume %s already exists, skipping creation", volID)
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return nil
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}
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if err = m.mount(cephRoot, adminCr, volOptions, volID); err != nil {
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return fmt.Errorf("error mounting ceph root: %v", err)
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}
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defer unmountAndRemove(cephRoot)
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volOptions.RootPath = getVolumeRootPathCeph(volID)
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localVolRoot := getCephRootVolumePathLocal(volID)
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if err := createMountPoint(localVolRoot); err != nil {
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if err := createMountPoint(volRootCreating); err != nil {
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return err
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}
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if bytesQuota > 0 {
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if err := setVolumeAttribute(localVolRoot, "ceph.quota.max_bytes", fmt.Sprintf("%d", bytesQuota)); err != nil {
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if err := setVolumeAttribute(volRootCreating, "ceph.quota.max_bytes", fmt.Sprintf("%d", bytesQuota)); err != nil {
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return err
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}
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}
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if err := setVolumeAttribute(localVolRoot, "ceph.dir.layout.pool", volOptions.Pool); err != nil {
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if err := setVolumeAttribute(volRootCreating, "ceph.dir.layout.pool", volOptions.Pool); err != nil {
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return fmt.Errorf("%v\ncephfs: Does pool '%s' exist?", err, volOptions.Pool)
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}
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if err := setVolumeAttribute(localVolRoot, "ceph.dir.layout.pool_namespace", getVolumeNamespace(volID)); err != nil {
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if err := setVolumeAttribute(volRootCreating, "ceph.dir.layout.pool_namespace", getVolumeNamespace(volID)); err != nil {
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return err
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}
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if err := os.Rename(volRootCreating, volRoot); err != nil {
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return fmt.Errorf("couldn't mark volume %s as created: %v", volID, err)
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}
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return nil
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}
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func purgeVolume(volID volumeID, adminCr *credentials, volOptions *volumeOptions) error {
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if err := mountCephRoot(volID, volOptions, adminCr); err != nil {
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return err
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}
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defer unmountCephRoot(volID)
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var (
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cephRoot = getCephRootPathLocal(volID)
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volRoot = getCephRootVolumePathLocal(volID)
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volRootDeleting = volRoot + "-deleting"
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)
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if err := createMountPoint(cephRoot); err != nil {
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return err
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}
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// Root path is not set for dynamically provisioned volumes
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// Access to cephfs's / is required
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volOptions.RootPath = "/"
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m, err := newMounter(volOptions)
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if err != nil {
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return fmt.Errorf("failed to create mounter: %v", err)
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}
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if err = m.mount(cephRoot, adminCr, volOptions, volID); err != nil {
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return fmt.Errorf("error mounting ceph root: %v", err)
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}
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defer unmountAndRemove(cephRoot)
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if err := os.Rename(volRoot, volRootDeleting); err != nil {
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return fmt.Errorf("couldn't mark volume %s for deletion: %v", volID, err)
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if pathExists(volRoot) {
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if err := os.Rename(volRoot, volRootDeleting); err != nil {
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return fmt.Errorf("couldn't mark volume %s for deletion: %v", volID, err)
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}
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} else {
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if !pathExists(volRootDeleting) {
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klog.V(4).Infof("cephfs: volume %s not found, assuming it to be already deleted", volID)
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return nil
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}
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}
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if err := os.RemoveAll(volRootDeleting); err != nil {
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@ -134,13 +121,37 @@ func purgeVolume(volID volumeID, adminCr *credentials, volOptions *volumeOptions
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return nil
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}
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func unmountAndRemove(mountPoint string) {
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var err error
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if err = unmountVolume(mountPoint); err != nil {
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klog.Errorf("failed to unmount %s with error %s", mountPoint, err)
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func mountCephRoot(volID volumeID, volOptions *volumeOptions, adminCr *credentials) error {
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cephRoot := getCephRootPathLocal(volID)
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// Root path is not set for dynamically provisioned volumes
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// Access to cephfs's / is required
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volOptions.RootPath = "/"
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if err := createMountPoint(cephRoot); err != nil {
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return err
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}
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if err = os.Remove(mountPoint); err != nil {
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klog.Errorf("failed to remove %s with error %s", mountPoint, err)
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m, err := newMounter(volOptions)
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if err != nil {
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return fmt.Errorf("failed to create mounter: %v", err)
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}
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if err = m.mount(cephRoot, adminCr, volOptions, volID); err != nil {
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return fmt.Errorf("error mounting ceph root: %v", err)
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}
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return nil
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}
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func unmountCephRoot(volID volumeID) {
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cephRoot := getCephRootPathLocal(volID)
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if err := unmountVolume(cephRoot); err != nil {
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klog.Errorf("failed to unmount %s with error %s", cephRoot, err)
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}
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if err := os.Remove(cephRoot); err != nil {
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klog.Errorf("failed to remove %s with error %s", cephRoot, err)
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}
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}
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