1
0
mirror of https://github.com/ceph/ceph-csi.git synced 2024-12-25 14:30:22 +00:00
ceph-csi/pkg/cephfs/volumemounter.go
ShyamsundarR c5762b6b5c Modify RBD plugin to use a single ID and move the id and key into the secret
RBD plugin needs only a single ID to manage images and operations against a
pool, mentioned in the storage class. The current scheme of 2 IDs is hence not
needed and removed in this commit.

Further, unlike CephFS plugin, the RBD plugin splits the user id and the key
into the storage class and the secret respectively. Also the parameter name
for the key in the secret is noted in the storageclass making it a variant and
hampers usability/comprehension. This is also fixed by moving the id and the key
to the secret and not retaining the same in the storage class, like CephFS.

Fixes 

Testing done:
- Basic PVC creation and mounting

Signed-off-by: ShyamsundarR <srangana@redhat.com>
2019-06-24 13:46:14 +00:00

243 lines
5.6 KiB
Go

/*
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 cephfs
import (
"errors"
"fmt"
"os"
"os/exec"
"regexp"
"strconv"
"strings"
"sync"
"github.com/ceph/ceph-csi/pkg/util"
"k8s.io/klog"
)
const (
volumeMounterFuse = "fuse"
volumeMounterKernel = "kernel"
)
var (
availableMounters []string
// maps a mountpoint to PID of its FUSE daemon
fusePidMap = make(map[string]int)
fusePidMapMtx sync.Mutex
fusePidRx = regexp.MustCompile(`(?m)^ceph-fuse\[(.+)\]: starting fuse$`)
)
// Load available ceph mounters installed on system into availableMounters
// Called from driver.go's Run()
func loadAvailableMounters() error {
// #nosec
fuseMounterProbe := exec.Command("ceph-fuse", "--version")
// #nosec
kernelMounterProbe := exec.Command("mount.ceph")
if fuseMounterProbe.Run() == nil {
availableMounters = append(availableMounters, volumeMounterFuse)
}
if kernelMounterProbe.Run() == nil {
availableMounters = append(availableMounters, volumeMounterKernel)
}
if len(availableMounters) == 0 {
return errors.New("no ceph mounters found on system")
}
return nil
}
type volumeMounter interface {
mount(mountPoint string, cr *util.Credentials, volOptions *volumeOptions) error
name() string
}
func newMounter(volOptions *volumeOptions) (volumeMounter, error) {
// Get the mounter from the configuration
wantMounter := volOptions.Mounter
if wantMounter == "" {
wantMounter = DefaultVolumeMounter
}
// Verify that it's available
var chosenMounter string
for _, availMounter := range availableMounters {
if chosenMounter == "" {
if availMounter == wantMounter {
chosenMounter = wantMounter
}
}
}
if chosenMounter == "" {
// Otherwise pick whatever is left
chosenMounter = availableMounters[0]
}
// Create the mounter
switch chosenMounter {
case volumeMounterFuse:
return &fuseMounter{}, nil
case volumeMounterKernel:
return &kernelMounter{}, nil
}
return nil, fmt.Errorf("unknown mounter '%s'", chosenMounter)
}
type fuseMounter struct{}
func mountFuse(mountPoint string, cr *util.Credentials, volOptions *volumeOptions) error {
args := []string{
mountPoint,
"-m", volOptions.Monitors,
"-c", util.CephConfigPath,
"-n", cephEntityClientPrefix + cr.ID, "--key=" + cr.Key,
"-r", volOptions.RootPath,
"-o", "nonempty",
}
if volOptions.FsName != "" {
args = append(args, "--client_mds_namespace="+volOptions.FsName)
}
_, stderr, err := execCommand("ceph-fuse", args[:]...)
if err != nil {
return err
}
// Parse the output:
// We need "starting fuse" meaning the mount is ok
// and PID of the ceph-fuse daemon for unmount
match := fusePidRx.FindSubmatch(stderr)
if len(match) != 2 {
return fmt.Errorf("ceph-fuse failed: %s", stderr)
}
pid, err := strconv.Atoi(string(match[1]))
if err != nil {
return fmt.Errorf("failed to parse FUSE daemon PID: %v", err)
}
fusePidMapMtx.Lock()
fusePidMap[mountPoint] = pid
fusePidMapMtx.Unlock()
return nil
}
func (m *fuseMounter) mount(mountPoint string, cr *util.Credentials, volOptions *volumeOptions) error {
if err := createMountPoint(mountPoint); err != nil {
return err
}
return mountFuse(mountPoint, cr, volOptions)
}
func (m *fuseMounter) name() string { return "Ceph FUSE driver" }
type kernelMounter struct{}
func mountKernel(mountPoint string, cr *util.Credentials, volOptions *volumeOptions) error {
if err := execCommandErr("modprobe", "ceph"); err != nil {
return err
}
args := []string{
"-t", "ceph",
fmt.Sprintf("%s:%s", volOptions.Monitors, volOptions.RootPath),
mountPoint,
}
optionsStr := fmt.Sprintf("name=%s,secret=%s", cr.ID, cr.Key)
if volOptions.FsName != "" {
optionsStr += fmt.Sprintf(",mds_namespace=%s", volOptions.FsName)
}
args = append(args, "-o", optionsStr)
return execCommandErr("mount", args[:]...)
}
func (m *kernelMounter) mount(mountPoint string, cr *util.Credentials, volOptions *volumeOptions) error {
if err := createMountPoint(mountPoint); err != nil {
return err
}
return mountKernel(mountPoint, cr, volOptions)
}
func (m *kernelMounter) name() string { return "Ceph kernel client" }
func bindMount(from, to string, readOnly bool, mntOptions []string) error {
mntOptionSli := strings.Join(mntOptions, ",")
if err := execCommandErr("mount", "-o", mntOptionSli, from, to); err != nil {
return fmt.Errorf("failed to bind-mount %s to %s: %v", from, to, err)
}
if readOnly {
mntOptionSli += ",remount"
if err := execCommandErr("mount", "-o", mntOptionSli, to); err != nil {
return fmt.Errorf("failed read-only remount of %s: %v", to, err)
}
}
return nil
}
func unmountVolume(mountPoint string) error {
if err := execCommandErr("umount", mountPoint); err != nil {
return err
}
fusePidMapMtx.Lock()
pid, ok := fusePidMap[mountPoint]
if ok {
delete(fusePidMap, mountPoint)
}
fusePidMapMtx.Unlock()
if ok {
p, err := os.FindProcess(pid)
if err != nil {
klog.Warningf("failed to find process %d: %v", pid, err)
} else {
if _, err = p.Wait(); err != nil {
klog.Warningf("%d is not a child process: %v", pid, err)
}
}
}
return nil
}
func createMountPoint(root string) error {
return os.MkdirAll(root, 0750)
}