Documentation
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Overview ¶
Copyright 2016 Google Inc. All Rights Reserved.
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 devicemapper contains code for working with devicemapper ¶
Copyright 2016 Google Inc. All Rights Reserved.
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.
Copyright 2016 Google Inc. All Rights Reserved.
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.
Index ¶
Constants ¶
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Variables ¶
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Functions ¶
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Types ¶
type DmsetupClient ¶
type DmsetupClient interface {
Table(deviceName string) ([]byte, error)
Message(deviceName string, sector int, message string) ([]byte, error)
Status(deviceName string) ([]byte, error)
}
DmsetupClient is a low-level client for interacting with devicemapper via the dmsetup utility.
func NewDmsetupClient ¶
func NewDmsetupClient() DmsetupClient
type ThinPoolWatcher ¶
type ThinPoolWatcher struct {
// contains filtered or unexported fields
}
ThinPoolWatcher maintains a cache of device name -> usage stats for a devicemapper thin-pool using thin_ls.
func NewThinPoolWatcher ¶
func NewThinPoolWatcher(poolName, metadataDevice string) *ThinPoolWatcher
NewThinPoolWatcher returns a new ThinPoolWatcher for the given devicemapper thin pool name and metadata device.
func (*ThinPoolWatcher) GetUsage ¶
func (w *ThinPoolWatcher) GetUsage(deviceId string) (uint64, error)
GetUsage gets the cached usage value of the given device.
func (*ThinPoolWatcher) Refresh ¶
func (w *ThinPoolWatcher) Refresh() error
Refresh performs a `thin_ls` of the pool being watched and refreshes the cached data with the result.
func (*ThinPoolWatcher) Start ¶
func (w *ThinPoolWatcher) Start()
Start starts the thin pool watcher.
func (*ThinPoolWatcher) Stop ¶
func (w *ThinPoolWatcher) Stop()
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