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nfs: use go-ceph API for creating/deleting exports

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Recent versions of Ceph allow calling the NFS-export management
functions over the go-ceph API.

This seems incompatible with older versions that have been tested with
the `ceph nfs` commands that this commit replaces.

Signed-off-by: Niels de Vos <ndevos@redhat.com>
This commit is contained in:
Niels de Vos 2022-03-30 10:45:07 +02:00 committed by mergify[bot]
parent d886ab0d66
commit 28369702d2
2 changed files with 57 additions and 50 deletions
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96
internal/nfs/controller/volume.go
View File

@ -26,6 +26,7 @@ import (
fsutil "github.com/ceph/ceph-csi/internal/cephfs/util"
"github.com/ceph/ceph-csi/internal/util"
"github.com/ceph/go-ceph/common/admin/nfs"
"github.com/container-storage-interface/spec/lib/go/csi"
)
@ -135,24 +136,33 @@ func (nv *NFSVolume) CreateExport(backend *csi.Volume) error {
return fmt.Errorf("failed to set NFS-cluster: %w", err)
}
// TODO: use new go-ceph API, see ceph/ceph-csi#2977
// new versions of Ceph use a different command, and the go-ceph API
// also seems to be different :-/
//
// run the new command, but fall back to the previous one in case of an
// error
cmds := [][]string{
// ceph nfs export create cephfs --cluster-id <cluster_id>
// --pseudo-path <pseudo_path> --fsname <fsname>
// [--readonly] [--path=/path/in/cephfs]
nv.createExportCommand("--cluster-id="+nfsCluster,
"--fsname="+fs, "--pseudo-path="+nv.GetExportPath(),
"--path="+path),
// ceph nfs export create cephfs ${FS} ${NFS} /${EXPORT} ${SUBVOL_PATH}
nv.createExportCommand(nfsCluster, fs, nv.GetExportPath(), path),
nfsa, err := nv.conn.GetNFSAdmin()
if err != nil {
return fmt.Errorf("failed to get NFSAdmin: %w", err)
}
stderr, err := nv.retryIfInvalid(cmds)
_, err = nfsa.CreateCephFSExport(nfs.CephFSExportSpec{
FileSystemName: fs,
ClusterID: nfsCluster,
PseudoPath: nv.GetExportPath(),
Path: path,
})
switch {
case err == nil:
return nil
case strings.Contains(err.Error(), "rados: ret=-2"): // try with the old command
break
default: // any other error
return fmt.Errorf("exporting %q on NFS-cluster %q failed: %w",
nv, nfsCluster, err)
}
// if we get here, the API call failed, fallback to the old command
// ceph nfs export create cephfs ${FS} ${NFS} /${EXPORT} ${SUBVOL_PATH}
cmd := nv.createExportCommand(nfsCluster, fs, nv.GetExportPath(), path)
_, stderr, err := util.ExecCommand(nv.ctx, "ceph", cmd...)
if err != nil {
return fmt.Errorf("failed to create export %q in NFS-cluster %q"+
"(%v): %s", nv, nfsCluster, err, stderr)
@ -161,28 +171,6 @@ func (nv *NFSVolume) CreateExport(backend *csi.Volume) error {
return nil
}
// retryIfInvalid executes the "ceph" command, and falls back to the next cmd
// in case the error is EINVAL.
func (nv *NFSVolume) retryIfInvalid(cmds [][]string) (string, error) {
var (
stderr string
err error
)
for _, cmd := range cmds {
_, stderr, err = util.ExecCommand(nv.ctx, "ceph", cmd...)
// in case of an invalid command, fallback to the next one
if strings.Contains(stderr, "Error EINVAL: invalid command") {
continue
}
// If we get here, either no error, or an unexpected error
// happened. There is no need to retry an other command.
break
}
return stderr, err
}
// createExportCommand returns the "ceph nfs export create ..." command
// arguments (without "ceph"). The order of the parameters matches old Ceph
// releases, new Ceph releases added --option formats, which can be added when
@ -214,20 +202,28 @@ func (nv *NFSVolume) DeleteExport() error {
return fmt.Errorf("failed to identify NFS cluster: %w", err)
}
// TODO: use new go-ceph API, see ceph/ceph-csi#2977
// new versions of Ceph use a different command, and the go-ceph API
// also seems to be different :-/
//
// run the new command, but fall back to the previous one in case of an
// error
cmds := [][]string{
// ceph nfs export rm <cluster_id> <pseudo_path>
nv.deleteExportCommand("rm", nfsCluster),
// ceph nfs export delete <cluster_id> <pseudo_path>
nv.deleteExportCommand("delete", nfsCluster),
nfsa, err := nv.conn.GetNFSAdmin()
if err != nil {
return fmt.Errorf("failed to get NFSAdmin: %w", err)
}
stderr, err := nv.retryIfInvalid(cmds)
err = nfsa.RemoveExport(nfsCluster, nv.GetExportPath())
switch {
case err == nil:
return nil
case strings.Contains(err.Error(), "API call not implemented"): // try with the old command
break
default: // any other error
return fmt.Errorf("failed to remove %q from NFS-cluster %q: "+
"%w", nv, nfsCluster, err)
}
// if we get here, the API call failed, fallback to the old command
// ceph nfs export delete <cluster_id> <pseudo_path>
cmd := nv.deleteExportCommand("delete", nfsCluster)
_, stderr, err := util.ExecCommand(nv.ctx, "ceph", cmd...)
if err != nil {
return fmt.Errorf("failed to delete export %q from NFS-cluster"+
"%q (%v): %s", nv, nfsCluster, err, stderr)

11
internal/util/connection.go
View File

@ -22,6 +22,7 @@ import (
"time"
ca "github.com/ceph/go-ceph/cephfs/admin"
"github.com/ceph/go-ceph/common/admin/nfs"
"github.com/ceph/go-ceph/rados"
ra "github.com/ceph/go-ceph/rbd/admin"
)
@ -140,3 +141,13 @@ func (cc *ClusterConnection) GetTaskAdmin() (*ra.TaskAdmin, error) {
return rbdAdmin.Task(), nil
}
// GetNFSAdmin returns an Admin type that can be used to interact with the
// NFS-cluster that is managed by Ceph.
func (cc *ClusterConnection) GetNFSAdmin() (*nfs.Admin, error) {
if cc.conn == nil {
return nil, errors.New("cluster is not connected yet")
}
return nfs.NewFromConn(cc.conn), nil
}