mirror of
https://github.com/yunionio/cloudpods.git
synced 2026-06-20 16:36:03 +08:00
92 lines
1.9 KiB
Go
92 lines
1.9 KiB
Go
// Copyright 2019 Yunion
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package nbd
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import (
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"fmt"
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"sync"
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"yunion.io/x/log"
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"yunion.io/x/onecloud/pkg/util/fileutils2"
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)
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type SNBDManager struct {
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nbdDevs map[string]bool
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nbdLock *sync.Mutex
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}
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var nbdManager *SNBDManager
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func Init() error {
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var err error
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nbdManager, err = NewNBDManager()
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return err
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}
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func GetNBDManager() *SNBDManager {
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return nbdManager
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}
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func NewNBDManager() (*SNBDManager, error) {
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var ret = new(SNBDManager)
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ret.nbdDevs = make(map[string]bool, 0)
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ret.nbdLock = new(sync.Mutex)
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if err := ret.findNbdDevices(); err != nil {
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return ret, err
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}
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return ret, nil
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}
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func (m *SNBDManager) findNbdDevices() error {
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var i = 0
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for {
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if fileutils2.Exists(fmt.Sprintf("/dev/nbd%d", i)) {
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m.nbdDevs[fmt.Sprintf("/dev/nbd%d", i)] = false
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i++
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} else {
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break
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}
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}
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log.Infof("NBD_DEVS: %#v", m.nbdDevs)
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if len(m.nbdDevs) == 0 {
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return fmt.Errorf("No nbd devices found")
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}
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return nil
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}
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func (m *SNBDManager) AcquireNbddev() string {
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defer m.nbdLock.Unlock()
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m.nbdLock.Lock()
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for nbdDev := range m.nbdDevs {
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if fileutils2.IsBlockDeviceUsed(nbdDev) {
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m.nbdDevs[nbdDev] = true
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}
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if !m.nbdDevs[nbdDev] {
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m.nbdDevs[nbdDev] = true
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return nbdDev
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}
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}
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return ""
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}
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func (m *SNBDManager) ReleaseNbddev(nbddev string) {
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if _, ok := m.nbdDevs[nbddev]; ok {
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defer m.nbdLock.Unlock()
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m.nbdLock.Lock()
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m.nbdDevs[nbddev] = false
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}
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}
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