mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-09-19 23:19:52 +00:00
129 lines
2.9 KiB
Go
129 lines
2.9 KiB
Go
/*
|
|
Copyright 2018 The Kubernetes 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 (
|
|
"encoding/json"
|
|
"fmt"
|
|
"io/ioutil"
|
|
"os"
|
|
"path"
|
|
"strings"
|
|
"sync"
|
|
|
|
"github.com/golang/glog"
|
|
)
|
|
|
|
const (
|
|
controllerCacheRoot = PluginFolder + "/controller/plugin-cache"
|
|
)
|
|
|
|
type controllerCacheEntry struct {
|
|
VolOptions volumeOptions
|
|
VolumeID volumeID
|
|
}
|
|
|
|
type controllerCacheMap map[volumeID]*controllerCacheEntry
|
|
|
|
var (
|
|
ctrCache = make(controllerCacheMap)
|
|
ctrCacheMtx sync.Mutex
|
|
)
|
|
|
|
// Load all .json files from controllerCacheRoot into ctrCache
|
|
// Called from driver.go's Run()
|
|
func loadControllerCache() error {
|
|
cacheDir, err := ioutil.ReadDir(controllerCacheRoot)
|
|
if err != nil {
|
|
return fmt.Errorf("cannot read controller cache from %s: %v", controllerCacheRoot, err)
|
|
}
|
|
|
|
ctrCacheMtx.Lock()
|
|
defer ctrCacheMtx.Unlock()
|
|
|
|
for _, fi := range cacheDir {
|
|
if !strings.HasSuffix(fi.Name(), ".json") || !fi.Mode().IsRegular() {
|
|
continue
|
|
}
|
|
|
|
f, err := os.Open(path.Join(controllerCacheRoot, fi.Name()))
|
|
if err != nil {
|
|
glog.Errorf("cephfs: cloudn't read '%s' from controller cache: %v", fi.Name(), err)
|
|
continue
|
|
}
|
|
|
|
d := json.NewDecoder(f)
|
|
ent := &controllerCacheEntry{}
|
|
|
|
if err = d.Decode(ent); err != nil {
|
|
glog.Errorf("cephfs: failed to parse '%s': %v", fi.Name(), err)
|
|
} else {
|
|
ctrCache[ent.VolumeID] = ent
|
|
}
|
|
|
|
f.Close()
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func getControllerCacheEntryPath(volId volumeID) string {
|
|
return path.Join(controllerCacheRoot, string(volId)+".json")
|
|
}
|
|
|
|
func (m controllerCacheMap) insert(ent *controllerCacheEntry) error {
|
|
filePath := getControllerCacheEntryPath(ent.VolumeID)
|
|
|
|
ctrCacheMtx.Lock()
|
|
defer ctrCacheMtx.Unlock()
|
|
|
|
f, err := os.Create(filePath)
|
|
if err != nil {
|
|
return fmt.Errorf("couldn't create cache entry file '%s': %v", filePath, err)
|
|
}
|
|
defer f.Close()
|
|
|
|
enc := json.NewEncoder(f)
|
|
if err = enc.Encode(ent); err != nil {
|
|
return fmt.Errorf("failed to encode cache entry for volume %s: %v", ent.VolumeID, err)
|
|
}
|
|
|
|
m[ent.VolumeID] = ent
|
|
|
|
return nil
|
|
}
|
|
|
|
func (m controllerCacheMap) pop(volId volumeID) (*controllerCacheEntry, error) {
|
|
ctrCacheMtx.Lock()
|
|
defer ctrCacheMtx.Unlock()
|
|
|
|
ent, ok := m[volId]
|
|
if !ok {
|
|
return nil, fmt.Errorf("cache entry for volume %s does not exist", volId)
|
|
}
|
|
|
|
filePath := getControllerCacheEntryPath(volId)
|
|
|
|
if err := os.Remove(filePath); err != nil {
|
|
return nil, fmt.Errorf("failed to remove cache entry file '%s': %v", filePath, err)
|
|
}
|
|
|
|
delete(m, volId)
|
|
|
|
return ent, nil
|
|
}
|