mirror of
https://github.com/prometheus/prometheus.git
synced 2024-12-30 07:59:40 -08:00
48 lines
1.4 KiB
Go
48 lines
1.4 KiB
Go
|
// Copyright 2015 The etcd Authors
|
||
|
|
//
|
||
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
// you may not use this file except in compliance with the License.
|
||
|
|
// You may obtain a copy of the License at
|
||
|
|
//
|
||
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
//
|
||
|
|
// Unless required by applicable law or agreed to in writing, software
|
||
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
// See the License for the specific language governing permissions and
|
||
|
|
// limitations under the License.
|
||
|
|
|
||
|
|
package fileutil
|
||
|
|
|
||
|
|
import (
|
||
|
|
"os"
|
||
|
|
"syscall"
|
||
|
|
)
|
||
|
|
|
||
|
|
func preallocExtend(f *os.File, sizeInBytes int64) error {
|
||
|
|
// use mode = 0 to change size
|
||
|
|
err := syscall.Fallocate(int(f.Fd()), 0, 0, sizeInBytes)
|
||
|
|
if err != nil {
|
||
|
|
errno, ok := err.(syscall.Errno)
|
||
|
|
// not supported; fallback
|
||
|
|
// fallocate EINTRs frequently in some environments; fallback
|
||
|
|
if ok && (errno == syscall.ENOTSUP || errno == syscall.EINTR) {
|
||
|
|
return preallocExtendTrunc(f, sizeInBytes)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
|
||
|
|
func preallocFixed(f *os.File, sizeInBytes int64) error {
|
||
|
|
// use mode = 1 to keep size; see FALLOC_FL_KEEP_SIZE
|
||
|
|
err := syscall.Fallocate(int(f.Fd()), 1, 0, sizeInBytes)
|
||
|
|
if err != nil {
|
||
|
|
errno, ok := err.(syscall.Errno)
|
||
|
|
// treat not supported as nil error
|
||
|
|
if ok && errno == syscall.ENOTSUP {
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return err
|
||
|
|
}
|