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47 lines
1.4 KiB
47 lines
1.4 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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) |
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func preallocExtend(f *os.File, sizeInBytes int64) error { |
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// use mode = 0 to change size |
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err := syscall.Fallocate(int(f.Fd()), 0, 0, sizeInBytes) |
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if err != nil { |
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errno, ok := err.(syscall.Errno) |
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// not supported; fallback |
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// fallocate EINTRs frequently in some environments; fallback |
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if ok && (errno == syscall.ENOTSUP || errno == syscall.EINTR) { |
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return preallocExtendTrunc(f, sizeInBytes) |
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} |
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} |
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return err |
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} |
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func preallocFixed(f *os.File, sizeInBytes int64) error { |
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// use mode = 1 to keep size; see FALLOC_FL_KEEP_SIZE |
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err := syscall.Fallocate(int(f.Fd()), 1, 0, sizeInBytes) |
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if err != nil { |
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errno, ok := err.(syscall.Errno) |
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// treat not supported as nil error |
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if ok && errno == syscall.ENOTSUP { |
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return nil |
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} |
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} |
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return err |
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}
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