ceph-csi/internal/cephfs/mounter/volumemounter.go

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/*
Copyright 2018 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 mounter
import (
"context"
"errors"
"fmt"
"os/exec"
"strings"
"github.com/ceph/ceph-csi/internal/cephfs/store"
"github.com/ceph/ceph-csi/internal/util"
"github.com/ceph/ceph-csi/internal/util/log"
)
var (
availableMounters []string
//nolint:gomnd // numbers specify Kernel versions.
quotaSupport = []util.KernelVersion{
{
Version: 4,
PatchLevel: 17,
SubLevel: 0,
ExtraVersion: 0, Distribution: "",
Backport: false,
}, // standard 4.17+ versions
{
Version: 3,
PatchLevel: 10,
SubLevel: 0,
ExtraVersion: 1062,
Distribution: ".el7",
Backport: true,
}, // RHEL-7.7
}
)
func execCommandErr(ctx context.Context, program string, args ...string) error {
_, _, err := util.ExecCommand(ctx, program, args...)
return err
}
// Load available ceph mounters installed on system into availableMounters
// Called from driver.go's Run().
func LoadAvailableMounters(conf *util.Config) error {
// #nosec
fuseMounterProbe := exec.Command("ceph-fuse", "--version")
// #nosec
kernelMounterProbe := exec.Command("mount.ceph")
err := kernelMounterProbe.Run()
if err != nil {
log.ErrorLogMsg("failed to run mount.ceph %v", err)
} else {
// fetch the current running kernel info
release, kvErr := util.GetKernelVersion()
if kvErr != nil {
return kvErr
}
if conf.ForceKernelCephFS || util.CheckKernelSupport(release, quotaSupport) {
log.DefaultLog("loaded mounter: %s", volumeMounterKernel)
availableMounters = append(availableMounters, volumeMounterKernel)
} else {
log.DefaultLog("kernel version < 4.17 might not support quota feature, hence not loading kernel client")
}
}
err = fuseMounterProbe.Run()
if err != nil {
log.ErrorLogMsg("failed to run ceph-fuse %v", err)
} else {
log.DefaultLog("loaded mounter: %s", volumeMounterFuse)
availableMounters = append(availableMounters, volumeMounterFuse)
}
if len(availableMounters) == 0 {
return errors.New("no ceph mounters found on system")
}
return nil
}
type VolumeMounter interface {
Mount(ctx context.Context, mountPoint string, cr *util.Credentials, volOptions *store.VolumeOptions) error
Name() string
}
func New(volOptions *store.VolumeOptions) (VolumeMounter, error) {
// Get the mounter from the configuration
wantMounter := volOptions.Mounter
// Verify that it's available
var chosenMounter string
for _, availMounter := range availableMounters {
if availMounter == wantMounter {
chosenMounter = wantMounter
break
}
}
if chosenMounter == "" {
// Otherwise pick whatever is left
chosenMounter = availableMounters[0]
log.DebugLogMsg("requested mounter: %s, chosen mounter: %s", wantMounter, chosenMounter)
}
// Create the mounter
switch chosenMounter {
case volumeMounterFuse:
return &FuseMounter{}, nil
case volumeMounterKernel:
return &KernelMounter{}, nil
}
return nil, fmt.Errorf("unknown mounter '%s'", chosenMounter)
}
func BindMount(ctx context.Context, from, to string, readOnly bool, mntOptions []string) error {
mntOptionSli := strings.Join(mntOptions, ",")
if err := execCommandErr(ctx, "mount", "-o", mntOptionSli, from, to); err != nil {
return fmt.Errorf("failed to bind-mount %s to %s: %w", from, to, err)
}
if readOnly {
mntOptionSli = util.MountOptionsAdd(mntOptionSli, "remount")
if err := execCommandErr(ctx, "mount", "-o", mntOptionSli, to); err != nil {
return fmt.Errorf("failed read-only remount of %s: %w", to, err)
}
}
return nil
}