forked from TrueCloudLab/frostfs-s3-gw
35 lines
1.2 KiB
Go
35 lines
1.2 KiB
Go
// +build linux
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/*
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* MinIO Cloud Storage, (C) 2016 MinIO, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cmd
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import "syscall"
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// Fallocate uses the linux Fallocate syscall, which helps us to be
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// sure that subsequent writes on a file just created will not fail,
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// in addition, file allocation will be contigous on the disk
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func Fallocate(fd int, offset int64, len int64) error {
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// No need to attempt fallocate for 0 length.
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if len == 0 {
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return nil
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}
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// Don't extend size of file even if offset + len is
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// greater than file size from <bits/fcntl-linux.h>.
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fallocFLKeepSize := uint32(1)
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return syscall.Fallocate(fd, fallocFLKeepSize, offset, len)
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}
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