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// Copyright 2018 Google Inc.
//
// 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 fs
// SyncType enumerates ways in which a File can be synced.
type SyncType int
const (
// SyncAll indicates that modified in-memory metadata and data should
// be written to backing storage. SyncAll implies SyncBackingStorage.
SyncAll SyncType = iota
// SyncData indicates that along with modified in-memory data, only
// metadata needed to access that data needs to be written.
//
// For example, changes to access time or modification time do not
// need to be written because they are not necessary for a data read
// to be handled correctly, unlike the file size.
//
// The aim of SyncData is to reduce disk activity for applications
// that do not require all metadata to be synchronized with the disk,
// see fdatasync(2). File systems that implement SyncData as SyncAll
// do not support this optimization.
//
// SyncData implies SyncBackingStorage.
SyncData
// SyncBackingStorage indicates that in-flight write operations to
// backing storage should be flushed.
SyncBackingStorage
)
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