storj.io/minio@v0.0.0-20230509071714-0cbc90f649b1/cmd/fallocate_linux.go (about) 1 //go:build linux 2 // +build linux 3 4 /* 5 * MinIO Cloud Storage, (C) 2016 MinIO, Inc. 6 * 7 * Licensed under the Apache License, Version 2.0 (the "License"); 8 * you may not use this file except in compliance with the License. 9 * You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, software 14 * distributed under the License is distributed on an "AS IS" BASIS, 15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 16 * See the License for the specific language governing permissions and 17 * limitations under the License. 18 */ 19 20 package cmd 21 22 import "syscall" 23 24 // Fallocate uses the linux Fallocate syscall, which helps us to be 25 // sure that subsequent writes on a file just created will not fail, 26 // in addition, file allocation will be contigous on the disk 27 func Fallocate(fd int, offset int64, len int64) error { 28 // No need to attempt fallocate for 0 length. 29 if len == 0 { 30 return nil 31 } 32 // Don't extend size of file even if offset + len is 33 // greater than file size from <bits/fcntl-linux.h>. 34 fallocFLKeepSize := uint32(1) 35 return syscall.Fallocate(fd, fallocFLKeepSize, offset, len) 36 }