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41 lines
1.2 KiB
41 lines
1.2 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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"syscall" |
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"unsafe" |
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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 := &syscall.Fstore_t{ |
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Flags: syscall.F_ALLOCATEALL, |
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Posmode: syscall.F_PEOFPOSMODE, |
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Length: sizeInBytes} |
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p := unsafe.Pointer(fstore) |
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_, _, errno := syscall.Syscall(syscall.SYS_FCNTL, f.Fd(), uintptr(syscall.F_PREALLOCATE), uintptr(p)) |
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if errno == 0 || errno == syscall.ENOTSUP { |
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return nil |
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} |
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return errno |
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}
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