mirror of
https://github.com/ceph/ceph-csi.git
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d02e50aa9b
Existing config maps are now replaced with rados omaps that help store information regarding the requested volume names and the rbd image names backing the same. Further to detect cluster, pool and which image a volume ID refers to, changes to volume ID encoding has been done as per provided design specification in the stateless ceph-csi proposal. Additional changes and updates, - Updated documentation - Updated manifests - Updated Helm chart - Addressed a few csi-test failures Signed-off-by: ShyamsundarR <srangana@redhat.com>
230 lines
5.2 KiB
Go
230 lines
5.2 KiB
Go
/*
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Copyright 2018 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 cephfs
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import (
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"errors"
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"fmt"
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"os"
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"os/exec"
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"regexp"
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"strconv"
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"sync"
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"github.com/ceph/ceph-csi/pkg/util"
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"k8s.io/klog"
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)
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const (
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volumeMounterFuse = "fuse"
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volumeMounterKernel = "kernel"
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)
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var (
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availableMounters []string
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// maps a mountpoint to PID of its FUSE daemon
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fusePidMap = make(map[string]int)
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fusePidMapMtx sync.Mutex
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fusePidRx = regexp.MustCompile(`(?m)^ceph-fuse\[(.+)\]: starting fuse$`)
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)
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// Load available ceph mounters installed on system into availableMounters
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// Called from driver.go's Run()
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func loadAvailableMounters() error {
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// #nosec
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fuseMounterProbe := exec.Command("ceph-fuse", "--version")
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// #nosec
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kernelMounterProbe := exec.Command("mount.ceph")
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if fuseMounterProbe.Run() == nil {
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availableMounters = append(availableMounters, volumeMounterFuse)
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}
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if kernelMounterProbe.Run() == nil {
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availableMounters = append(availableMounters, volumeMounterKernel)
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}
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if len(availableMounters) == 0 {
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return errors.New("no ceph mounters found on system")
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}
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return nil
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}
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type volumeMounter interface {
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mount(mountPoint string, cr *credentials, volOptions *volumeOptions) error
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name() string
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}
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func newMounter(volOptions *volumeOptions) (volumeMounter, error) {
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// Get the mounter from the configuration
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wantMounter := volOptions.Mounter
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if wantMounter == "" {
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wantMounter = DefaultVolumeMounter
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}
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// Verify that it's available
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var chosenMounter string
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for _, availMounter := range availableMounters {
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if chosenMounter == "" {
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if availMounter == wantMounter {
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chosenMounter = wantMounter
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}
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}
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}
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if chosenMounter == "" {
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// Otherwise pick whatever is left
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chosenMounter = availableMounters[0]
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}
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// Create the mounter
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switch chosenMounter {
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case volumeMounterFuse:
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return &fuseMounter{}, nil
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case volumeMounterKernel:
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return &kernelMounter{}, nil
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}
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return nil, fmt.Errorf("unknown mounter '%s'", chosenMounter)
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}
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type fuseMounter struct{}
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func mountFuse(mountPoint string, cr *credentials, volOptions *volumeOptions) error {
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args := [...]string{
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mountPoint,
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"-m", volOptions.Monitors,
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"-c", util.CephConfigPath,
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"-n", cephEntityClientPrefix + cr.id, "--key=" + cr.key,
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"-r", volOptions.RootPath,
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"-o", "nonempty",
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}
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_, stderr, err := execCommand("ceph-fuse", args[:]...)
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if err != nil {
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return err
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}
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// Parse the output:
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// We need "starting fuse" meaning the mount is ok
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// and PID of the ceph-fuse daemon for unmount
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match := fusePidRx.FindSubmatch(stderr)
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if len(match) != 2 {
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return fmt.Errorf("ceph-fuse failed: %s", stderr)
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}
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pid, err := strconv.Atoi(string(match[1]))
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if err != nil {
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return fmt.Errorf("failed to parse FUSE daemon PID: %v", err)
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}
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fusePidMapMtx.Lock()
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fusePidMap[mountPoint] = pid
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fusePidMapMtx.Unlock()
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return nil
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}
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func (m *fuseMounter) mount(mountPoint string, cr *credentials, volOptions *volumeOptions) error {
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if err := createMountPoint(mountPoint); err != nil {
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return err
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}
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return mountFuse(mountPoint, cr, volOptions)
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}
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func (m *fuseMounter) name() string { return "Ceph FUSE driver" }
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type kernelMounter struct{}
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func mountKernel(mountPoint string, cr *credentials, volOptions *volumeOptions) error {
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if err := execCommandErr("modprobe", "ceph"); err != nil {
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return err
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}
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return execCommandErr("mount",
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"-t", "ceph",
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fmt.Sprintf("%s:%s", volOptions.Monitors, volOptions.RootPath),
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mountPoint,
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"-o", fmt.Sprintf("name=%s,secret=%s", cr.id, cr.key),
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)
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}
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func (m *kernelMounter) mount(mountPoint string, cr *credentials, volOptions *volumeOptions) error {
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if err := createMountPoint(mountPoint); err != nil {
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return err
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}
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return mountKernel(mountPoint, cr, volOptions)
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}
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func (m *kernelMounter) name() string { return "Ceph kernel client" }
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func bindMount(from, to string, readOnly bool) error {
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if err := execCommandErr("mount", "--bind", from, to); err != nil {
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return fmt.Errorf("failed to bind-mount %s to %s: %v", from, to, err)
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}
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if readOnly {
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if err := execCommandErr("mount", "-o", "remount,ro,bind", to); err != nil {
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return fmt.Errorf("failed read-only remount of %s: %v", to, err)
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}
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}
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return nil
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}
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func unmountVolume(mountPoint string) error {
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if err := execCommandErr("umount", mountPoint); err != nil {
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return err
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}
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fusePidMapMtx.Lock()
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pid, ok := fusePidMap[mountPoint]
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if ok {
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delete(fusePidMap, mountPoint)
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}
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fusePidMapMtx.Unlock()
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if ok {
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p, err := os.FindProcess(pid)
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if err != nil {
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klog.Warningf("failed to find process %d: %v", pid, err)
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} else {
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if _, err = p.Wait(); err != nil {
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klog.Warningf("%d is not a child process: %v", pid, err)
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}
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}
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}
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return nil
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}
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func createMountPoint(root string) error {
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return os.MkdirAll(root, 0750)
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}
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