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48 lines
1.4 KiB
48 lines
1.4 KiB
6 years ago
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// 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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