mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-09-19 23:19:52 +00:00
331 lines
10 KiB
Go
331 lines
10 KiB
Go
/*
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Copyright 2019 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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"context"
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"encoding/base64"
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"os"
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"sync"
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"syscall"
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"time"
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"github.com/ceph/ceph-csi/pkg/util"
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"github.com/pkg/errors"
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"k8s.io/klog"
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)
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type volumeMountCacheEntry struct {
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DriverVersion string `json:"driverVersion"`
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VolumeID string `json:"volumeID"`
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Mounter string `json:"mounter"`
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Secrets map[string]string `json:"secrets"`
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StagingPath string `json:"stagingPath"`
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TargetPaths map[string]bool `json:"targetPaths"`
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CreateTime time.Time `json:"createTime"`
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}
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type volumeMountCacheMap struct {
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volumes map[string]volumeMountCacheEntry
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nodeCacheStore util.NodeCache
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}
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var (
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volumeMountCachePrefix = "cephfs-mount-cache-"
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volumeMountCache volumeMountCacheMap
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volumeMountCacheMtx sync.Mutex
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)
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func initVolumeMountCache(driverName, mountCacheDir string) {
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volumeMountCache.volumes = make(map[string]volumeMountCacheEntry)
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volumeMountCache.nodeCacheStore.BasePath = mountCacheDir
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volumeMountCache.nodeCacheStore.CacheDir = driverName
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klog.Infof("mount-cache: name: %s, version: %s, mountCacheDir: %s", driverName, util.DriverVersion, mountCacheDir)
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}
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func remountCachedVolumes() error {
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if err := util.CreateMountPoint(volumeMountCache.nodeCacheStore.BasePath); err != nil {
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klog.Errorf("mount-cache: failed to create %s: %v", volumeMountCache.nodeCacheStore.BasePath, err)
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return err
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}
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var remountFailCount, remountSuccCount int64
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me := &volumeMountCacheEntry{}
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err := volumeMountCache.nodeCacheStore.ForAll(volumeMountCachePrefix, me, func(identifier string) error {
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volID := me.VolumeID
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if volOpts, vid, err := newVolumeOptionsFromVolID(context.TODO(), me.VolumeID, nil, decodeCredentials(me.Secrets)); err != nil {
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if err, ok := err.(util.ErrKeyNotFound); ok {
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klog.Infof("mount-cache: image key not found, assuming the volume %s to be already deleted (%v)", volID, err)
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if err := volumeMountCache.nodeCacheStore.Delete(genVolumeMountCacheFileName(volID)); err == nil {
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klog.Infof("mount-cache: metadata not found, delete volume cache entry for volume %s", volID)
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}
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}
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} else {
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// update Mounter from mount cache
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volOpts.Mounter = me.Mounter
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if err := mountOneCacheEntry(volOpts, vid, me); err == nil {
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remountSuccCount++
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volumeMountCache.volumes[me.VolumeID] = *me
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klog.Infof("mount-cache: successfully remounted volume %s", volID)
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} else {
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remountFailCount++
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klog.Errorf("mount-cache: failed to remount volume %s", volID)
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}
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}
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return nil
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})
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if err != nil {
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klog.Infof("mount-cache: metastore list cache fail %v", err)
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return err
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}
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if remountFailCount > 0 {
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klog.Infof("mount-cache: successfully remounted %d volumes, failed to remount %d volumes", remountSuccCount, remountFailCount)
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} else {
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klog.Infof("mount-cache: successfully remounted %d volumes", remountSuccCount)
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}
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return nil
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}
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func mountOneCacheEntry(volOptions *volumeOptions, vid *volumeIdentifier, me *volumeMountCacheEntry) error {
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volumeMountCacheMtx.Lock()
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defer volumeMountCacheMtx.Unlock()
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var (
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err error
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cr *util.Credentials
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)
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volID := vid.VolumeID
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if volOptions.ProvisionVolume {
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cr, err = util.NewAdminCredentials(decodeCredentials(me.Secrets))
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if err != nil {
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return err
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}
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defer cr.DeleteCredentials()
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volOptions.RootPath, err = getVolumeRootPathCeph(context.TODO(), volOptions, cr, volumeID(vid.FsSubvolName))
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if err != nil {
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return err
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}
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} else {
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cr, err = util.NewUserCredentials(decodeCredentials(me.Secrets))
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if err != nil {
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return err
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}
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defer cr.DeleteCredentials()
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}
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err = cleanupMountPoint(me.StagingPath)
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if err != nil {
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klog.Infof("mount-cache: failed to cleanup volume mount point %s, remove it: %s %v", volID, me.StagingPath, err)
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return err
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}
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isMnt, err := util.IsMountPoint(me.StagingPath)
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if err != nil {
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isMnt = false
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klog.Infof("mount-cache: failed to check volume mounted %s: %s %v", volID, me.StagingPath, err)
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}
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if !isMnt {
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m, err := newMounter(volOptions)
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if err != nil {
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klog.Errorf("mount-cache: failed to create mounter for volume %s: %v", volID, err)
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return err
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}
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if err := m.mount(context.TODO(), me.StagingPath, cr, volOptions); err != nil {
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klog.Errorf("mount-cache: failed to mount volume %s: %v", volID, err)
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return err
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}
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}
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mountOptions := []string{"bind"}
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for targetPath, readOnly := range me.TargetPaths {
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if err := cleanupMountPoint(targetPath); err == nil {
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if err := bindMount(context.TODO(), me.StagingPath, targetPath, readOnly, mountOptions); err != nil {
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klog.Errorf("mount-cache: failed to bind-mount volume %s: %s %s %v %v",
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volID, me.StagingPath, targetPath, readOnly, err)
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} else {
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klog.Infof("mount-cache: successfully bind-mounted volume %s: %s %s %v",
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volID, me.StagingPath, targetPath, readOnly)
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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 cleanupMountPoint(mountPoint string) error {
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if _, err := os.Stat(mountPoint); err != nil {
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if isCorruptedMnt(err) {
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klog.Infof("mount-cache: corrupted mount point %s, need unmount", mountPoint)
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err := execCommandErr(context.TODO(), "umount", mountPoint)
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if err != nil {
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klog.Infof("mount-cache: failed to umount %s %v", mountPoint, err)
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// ignore error return err
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}
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}
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}
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if _, err := os.Stat(mountPoint); err != nil {
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klog.Errorf("mount-cache: failed to stat mount point %s %v", mountPoint, err)
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return err
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}
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return nil
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}
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func isCorruptedMnt(err error) bool {
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var underlyingError error
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switch pe := err.(type) {
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case nil:
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return false
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case *os.PathError:
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underlyingError = pe.Err
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case *os.LinkError:
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underlyingError = pe.Err
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case *os.SyscallError:
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underlyingError = pe.Err
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default:
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return false
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}
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CorruptedErrors := []error{
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syscall.ENOTCONN, syscall.ESTALE, syscall.EIO, syscall.EACCES}
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for _, v := range CorruptedErrors {
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if underlyingError == v {
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return true
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}
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}
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return false
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}
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func genVolumeMountCacheFileName(volID string) string {
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cachePath := volumeMountCachePrefix + volID
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return cachePath
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}
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func (mc *volumeMountCacheMap) isEnable() bool {
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// if mount cache dir unset, disable state
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return mc.nodeCacheStore.BasePath != ""
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}
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func (mc *volumeMountCacheMap) nodeStageVolume(ctx context.Context, volID, stagingTargetPath, mounter string, secrets map[string]string) error {
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if !mc.isEnable() {
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return nil
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}
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volumeMountCacheMtx.Lock()
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defer volumeMountCacheMtx.Unlock()
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lastTargetPaths := make(map[string]bool)
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me, ok := volumeMountCache.volumes[volID]
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if ok {
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if me.StagingPath == stagingTargetPath {
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klog.Warningf(util.Log(ctx, "mount-cache: node unexpected restage volume for volume %s"), volID)
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return nil
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}
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lastTargetPaths = me.TargetPaths
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klog.Warningf(util.Log(ctx, "mount-cache: node stage volume ignore last cache entry for volume %s"), volID)
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}
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me = volumeMountCacheEntry{DriverVersion: util.DriverVersion}
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me.VolumeID = volID
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me.Secrets = encodeCredentials(secrets)
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me.StagingPath = stagingTargetPath
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me.TargetPaths = lastTargetPaths
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me.Mounter = mounter
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me.CreateTime = time.Now()
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volumeMountCache.volumes[volID] = me
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return mc.nodeCacheStore.Create(genVolumeMountCacheFileName(volID), me)
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}
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func (mc *volumeMountCacheMap) nodeUnStageVolume(volID string) error {
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if !mc.isEnable() {
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return nil
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}
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volumeMountCacheMtx.Lock()
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defer volumeMountCacheMtx.Unlock()
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delete(volumeMountCache.volumes, volID)
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return mc.nodeCacheStore.Delete(genVolumeMountCacheFileName(volID))
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}
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func (mc *volumeMountCacheMap) nodePublishVolume(ctx context.Context, volID, targetPath string, readOnly bool) error {
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if !mc.isEnable() {
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return nil
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}
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volumeMountCacheMtx.Lock()
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defer volumeMountCacheMtx.Unlock()
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_, ok := volumeMountCache.volumes[volID]
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if !ok {
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return errors.New("mount-cache: node publish volume failed to find cache entry for volume")
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}
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volumeMountCache.volumes[volID].TargetPaths[targetPath] = readOnly
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return mc.updateNodeCache(ctx, volID)
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}
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func (mc *volumeMountCacheMap) nodeUnPublishVolume(ctx context.Context, volID, targetPath string) error {
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if !mc.isEnable() {
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return nil
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}
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volumeMountCacheMtx.Lock()
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defer volumeMountCacheMtx.Unlock()
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_, ok := volumeMountCache.volumes[volID]
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if !ok {
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return errors.New("mount-cache: node unpublish volume failed to find cache entry for volume")
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}
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delete(volumeMountCache.volumes[volID].TargetPaths, targetPath)
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return mc.updateNodeCache(ctx, volID)
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}
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func (mc *volumeMountCacheMap) updateNodeCache(ctx context.Context, volID string) error {
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me := volumeMountCache.volumes[volID]
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if err := volumeMountCache.nodeCacheStore.Delete(genVolumeMountCacheFileName(volID)); err == nil {
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klog.Infof(util.Log(ctx, "mount-cache: metadata not found, delete mount cache failed for volume %s"), volID)
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}
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return mc.nodeCacheStore.Create(genVolumeMountCacheFileName(volID), me)
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}
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func encodeCredentials(input map[string]string) (output map[string]string) {
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output = make(map[string]string)
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for key, value := range input {
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nKey := base64.StdEncoding.EncodeToString([]byte(key))
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nValue := base64.StdEncoding.EncodeToString([]byte(value))
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output[nKey] = nValue
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}
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return output
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}
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func decodeCredentials(input map[string]string) (output map[string]string) {
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output = make(map[string]string)
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for key, value := range input {
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nKey, err := base64.StdEncoding.DecodeString(key)
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if err != nil {
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klog.Errorf("mount-cache: decode secret fail")
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continue
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}
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nValue, err := base64.StdEncoding.DecodeString(value)
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if err != nil {
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klog.Errorf("mount-cache: decode secret fail")
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continue
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}
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output[string(nKey)] = string(nValue)
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}
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return output
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}
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