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