minio/cmd/fallocate_linux.go at newux · gzur/minio

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// +build linux

* 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 cmd

import "syscall"

// Fallocate uses the linux Fallocate syscall, which helps us to be

// sure that subsequent writes on a file just created will not fail,

// in addition, file allocation will be contigous on the disk

func Fallocate(fd int, offset int64, len int64) error {

// No need to attempt fallocate for 0 length.

if len == 0 {

return nil

}

// Don't extend size of file even if offset + len is

// greater than file size from <bits/fcntl-linux.h>.

fallocFLKeepSize := uint32(1)

return syscall.Fallocate(fd, fallocFLKeepSize, offset, len)

}