mirror of
https://github.com/prometheus/prometheus.git
synced 2024-11-10 07:34:04 -08:00
42 lines
1.2 KiB
Go
42 lines
1.2 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"
|
|
"unsafe"
|
|
)
|
|
|
|
func preallocExtend(f *os.File, sizeInBytes int64) error {
|
|
if err := preallocFixed(f, sizeInBytes); err != nil {
|
|
return err
|
|
}
|
|
return preallocExtendTrunc(f, sizeInBytes)
|
|
}
|
|
|
|
func preallocFixed(f *os.File, sizeInBytes int64) error {
|
|
fstore := &syscall.Fstore_t{
|
|
Flags: syscall.F_ALLOCATEALL,
|
|
Posmode: syscall.F_PEOFPOSMODE,
|
|
Length: sizeInBytes}
|
|
p := unsafe.Pointer(fstore)
|
|
_, _, errno := syscall.Syscall(syscall.SYS_FCNTL, f.Fd(), uintptr(syscall.F_PREALLOCATE), uintptr(p))
|
|
if errno == 0 || errno == syscall.ENOTSUP {
|
|
return nil
|
|
}
|
|
return errno
|
|
}
|