mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-17 20:00:23 +00:00
132 lines
2.9 KiB
Go
132 lines
2.9 KiB
Go
/*
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Copyright 2018 The Kubernetes 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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"encoding/json"
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"fmt"
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"io/ioutil"
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"os"
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"path"
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"strings"
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"sync"
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"github.com/golang/glog"
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)
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const (
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volumeCacheRoot = PluginFolder + "/controller/volume-cache"
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)
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type volumeCacheEntry struct {
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VolOptions volumeOptions
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Identifier volumeIdentifier
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}
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type volumeCache struct {
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entries map[string]*volumeCacheEntry
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}
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var (
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volCache volumeCache
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volCacheMtx sync.RWMutex
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)
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// Loads all .json files from volumeCacheRoot into volCache
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// Called from driver.go's Run()
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func loadVolumeCache() error {
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cacheDir, err := ioutil.ReadDir(volumeCacheRoot)
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if err != nil {
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return fmt.Errorf("cannot read volume cache: %v", err)
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}
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volCacheMtx.Lock()
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defer volCacheMtx.Unlock()
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volCache.entries = make(map[string]*volumeCacheEntry)
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for _, fi := range cacheDir {
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if !strings.HasSuffix(fi.Name(), ".json") || !fi.Mode().IsRegular() {
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continue
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}
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f, err := os.Open(path.Join(volumeCacheRoot, fi.Name()))
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if err != nil {
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glog.Errorf("cephfs: couldn't read '%s' from volume cache: %v", fi.Name(), err)
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continue
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}
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d := json.NewDecoder(f)
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ent := &volumeCacheEntry{}
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if err = d.Decode(ent); err != nil {
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glog.Errorf("cephfs: failed to parse '%s': %v", fi.Name(), err)
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} else {
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volCache.entries[ent.Identifier.uuid] = ent
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}
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f.Close()
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}
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return nil
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}
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func getVolumeCacheEntryPath(volUuid string) string {
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return path.Join(volumeCacheRoot, fmt.Sprintf("vol-%s.json", volUuid))
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}
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func (vc *volumeCache) insert(ent *volumeCacheEntry) error {
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filePath := getVolumeCacheEntryPath(ent.Identifier.uuid)
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volCacheMtx.Lock()
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defer volCacheMtx.Unlock()
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f, err := os.Create(filePath)
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if err != nil {
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return fmt.Errorf("couldn't create cache entry file %s: %v", filePath, err)
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}
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defer f.Close()
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e := json.NewEncoder(f)
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if err = e.Encode(ent); err != nil {
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return fmt.Errorf("failed to encode cache entry for volume %s: %v", ent.Identifier.id, err)
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}
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vc.entries[ent.Identifier.uuid] = ent
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return nil
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}
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func (vc *volumeCache) erase(volUuid string) error {
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volCacheMtx.Lock()
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delete(vc.entries, volUuid)
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volCacheMtx.Unlock()
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return os.Remove(getVolumeCacheEntryPath(volUuid))
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}
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func (vc *volumeCache) get(volUuid string) (volumeCacheEntry, bool) {
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volCacheMtx.RLock()
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defer volCacheMtx.RUnlock()
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if ent, ok := vc.entries[volUuid]; ok {
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return *ent, true
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} else {
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return volumeCacheEntry{}, false
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}
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}
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