/
fs_manager.go
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/
fs_manager.go
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// Copyright 2019 The ChubaoFS 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 objectnode
import (
"hash/crc32"
"sync"
"time"
"github.com/cubefs/cubefs/proto"
"github.com/cubefs/cubefs/sdk/master"
"github.com/cubefs/cubefs/util/log"
)
const (
volumeBlacklistCleanupInterval = time.Minute * 1
volumeBlacklistTTL = time.Second * 10
volumeLoaderNum = 4
)
type VolumeLoader struct {
masters []string
store Store // Storage for ACP management
volumes map[string]*Volume // mapping: volume name -> *Volume
volMu sync.RWMutex
volInitMap sync.Map // mapping: volume name -> *sync.Mutex
blacklist sync.Map // mapping: volume name -> timestamp (time.Time)
closeOnce sync.Once
closeCh chan struct{}
metaStrict bool
}
func (loader *VolumeLoader) blacklistCleanup() {
t := time.NewTimer(volumeBlacklistCleanupInterval)
for {
select {
case <-t.C:
case <-loader.closeCh:
t.Stop()
return
}
loader.blacklist.Range(func(key, value interface{}) bool {
ts, is := value.(time.Time)
if !is || time.Since(ts) > volumeBlacklistTTL {
loader.blacklist.Delete(key)
}
return true
})
t.Reset(volumeBlacklistCleanupInterval)
}
}
func (loader *VolumeLoader) Release(volName string) {
loader.volMu.Lock()
vol, has := loader.volumes[volName]
if has {
delete(loader.volumes, volName)
log.LogDebugf("Release: release volume: volume(%v)", volName)
}
loader.volMu.Unlock()
if has && vol != nil {
if closeErr := vol.Close(); closeErr != nil {
log.LogErrorf("Release: close volume fail: volume(%v) err(%v)", volName, closeErr)
}
}
}
func (loader *VolumeLoader) Volume(volName string) (*Volume, error) {
return loader.loadVolume(volName)
}
func (loader *VolumeLoader) syncVolumeInit(volume string) (releaseFunc func()) {
value, _ := loader.volInitMap.LoadOrStore(volume, new(sync.Mutex))
var initMu = value.(*sync.Mutex)
initMu.Lock()
log.LogDebugf("syncVolumeInit: get volume init lock: volume(%v)", volume)
return func() {
initMu.Unlock()
loader.volInitMap.Delete(volume)
log.LogDebugf("syncVolumeInit: release volume init lock: volume(%v)", volume)
}
}
func (loader *VolumeLoader) loadVolume(volName string) (*Volume, error) {
var err error
// Check if the volume is on the blacklist.
if val, exist := loader.blacklist.Load(volName); exist {
if ts, is := val.(time.Time); is {
if time.Since(ts) <= volumeBlacklistTTL {
return nil, proto.ErrVolNotExists
}
}
}
var volume *Volume
var exist bool
loader.volMu.RLock()
volume, exist = loader.volumes[volName]
loader.volMu.RUnlock()
if !exist {
var release = loader.syncVolumeInit(volName)
loader.volMu.RLock()
volume, exist = loader.volumes[volName]
if exist {
loader.volMu.RUnlock()
release()
return volume, nil
}
loader.volMu.RUnlock()
var onAsyncTaskError AsyncTaskErrorFunc = func(err error) {
switch err {
case proto.ErrVolNotExists:
loader.Release(volName)
// Add to blacklist
loader.blacklist.Store(volName, time.Now())
default:
}
}
var config = &VolumeConfig{
Volume: volName,
Masters: loader.masters,
Store: loader.store,
OnAsyncTaskError: onAsyncTaskError,
MetaStrict: loader.metaStrict,
}
if volume, err = NewVolume(config); err != nil {
if err != proto.ErrVolNotExists {
log.LogErrorf("loadVolume: init volume fail: volume(%v) err(%v)", volume, err)
}
release()
// Add to blacklist
loader.blacklist.Store(volName, time.Now())
return nil, err
}
ak, sk := volume.OSSSecure()
log.LogDebugf("[loadVolume] load Volume: Name[%v] AccessKey[%v] SecretKey[%v]", volName, ak, sk)
loader.volMu.Lock()
loader.volumes[volName] = volume
loader.volMu.Unlock()
release()
}
return volume, nil
}
// Release all
func (loader *VolumeLoader) Close() {
loader.closeOnce.Do(func() {
loader.volMu.Lock()
defer loader.volMu.Unlock()
for volKey, vol := range loader.volumes {
_ = vol.Close()
log.LogDebugf("release Volume %v", volKey)
}
loader.volumes = make(map[string]*Volume)
close(loader.closeCh)
})
}
func NewVolumeLoader(masters []string, store Store, strict bool) *VolumeLoader {
loader := &VolumeLoader{
masters: masters,
store: store,
volumes: make(map[string]*Volume),
closeCh: make(chan struct{}),
metaStrict: strict,
}
go loader.blacklistCleanup()
return loader
}
type VolumeManager struct {
masters []string
mc *master.MasterClient
loaders [volumeLoaderNum]*VolumeLoader
store Store
metaStrict bool
closeOnce sync.Once
closeCh chan struct{}
}
func (m *VolumeManager) selectLoader(name string) *VolumeLoader {
i := crc32.ChecksumIEEE([]byte(name)) % volumeLoaderNum
return m.loaders[i]
}
func (m *VolumeManager) Volume(volName string) (*Volume, error) {
return m.selectLoader(volName).Volume(volName)
}
// Release all
func (m *VolumeManager) Close() {
m.closeOnce.Do(func() {
for _, loader := range m.loaders {
loader.Close()
}
})
}
func (m *VolumeManager) Release(volName string) {
m.selectLoader(volName).Release(volName)
}
func (m *VolumeManager) init() {
m.store = &xattrStore{
vm: m,
}
for i := 0; i < len(m.loaders); i++ {
m.loaders[i] = NewVolumeLoader(m.masters, m.store, m.metaStrict)
}
}
func NewVolumeManager(masters []string, strict bool) *VolumeManager {
manager := &VolumeManager{
masters: masters,
closeCh: make(chan struct{}),
metaStrict: strict,
}
manager.init()
return manager
}