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41 lines
1.1 KiB
41 lines
1.1 KiB
// Copyright 2015 The etcd 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 fileutil |
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import ( |
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"os" |
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"golang.org/x/sys/unix" |
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) |
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func preallocExtend(f *os.File, sizeInBytes int64) error { |
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if err := preallocFixed(f, sizeInBytes); err != nil { |
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return err |
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} |
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return preallocExtendTrunc(f, sizeInBytes) |
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} |
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func preallocFixed(f *os.File, sizeInBytes int64) error { |
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fstore := &unix.Fstore_t{ |
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Flags: unix.F_ALLOCATEALL, |
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Posmode: unix.F_PEOFPOSMODE, |
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Length: sizeInBytes, |
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} |
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err := unix.FcntlFstore(f.Fd(), unix.F_PREALLOCATE, fstore) |
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if err == nil || err == unix.ENOTSUP { |
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return nil |
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} |
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return err |
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}
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