forked from cerc-io/plugeth
37 lines
1.4 KiB
Go
37 lines
1.4 KiB
Go
|
// Copyright 2021 The go-ethereum Authors
|
||
|
|
// This file is part of the go-ethereum library.
|
||
|
|
//
|
||
|
|
// The go-ethereum library is free software: you can redistribute it and/or modify
|
||
|
|
// it under the terms of the GNU Lesser General Public License as published by
|
||
|
|
// the Free Software Foundation, either version 3 of the License, or
|
||
|
|
// (at your option) any later version.
|
||
|
|
//
|
||
|
|
// The go-ethereum library is distributed in the hope that it will be useful,
|
||
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
// GNU Lesser General Public License for more details.
|
||
|
|
//
|
||
|
|
// You should have received a copy of the GNU Lesser General Public License
|
||
|
|
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
|
||
|
|
//go:build !linux
|
||
|
|
// +build !linux
|
||
|
|
|
||
|
|
package ethash
|
||
|
|
|
||
|
|
import (
|
||
|
|
"os"
|
||
|
|
)
|
||
|
|
|
||
|
|
// ensureSize expands the file to the given size. This is to prevent runtime
|
||
|
|
// errors later on, if the underlying file expands beyond the disk capacity,
|
||
|
|
// even though it ostensibly is already expanded, but due to being sparse
|
||
|
|
// does not actually occupy the full declared size on disk.
|
||
|
|
func ensureSize(f *os.File, size int64) error {
|
||
|
|
// On systems which do not support fallocate, we merely truncate it.
|
||
|
|
// More robust alternatives would be to
|
||
|
|
// - Use posix_fallocate, or
|
||
|
|
// - explicitly fill the file with zeroes.
|
||
|
|
return f.Truncate(size)
|
||
|
|
}
|