mirror of https://github.com/k3s-io/k3s
66 lines
1.9 KiB
Go
66 lines
1.9 KiB
Go
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// Copyright 2016 The etcd Authors
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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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// +build darwin
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package fileutil
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import (
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"os"
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"syscall"
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"unsafe"
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)
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func preallocExtend(f *os.File, sizeInBytes int64) error {
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if err := preallocFixed(f, sizeInBytes); err != nil {
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return err
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}
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return preallocExtendTrunc(f, sizeInBytes)
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}
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func preallocFixed(f *os.File, sizeInBytes int64) error {
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// allocate all requested space or no space at all
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// TODO: allocate contiguous space on disk with F_ALLOCATECONTIG flag
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fstore := &syscall.Fstore_t{
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Flags: syscall.F_ALLOCATEALL,
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Posmode: syscall.F_PEOFPOSMODE,
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Length: sizeInBytes}
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p := unsafe.Pointer(fstore)
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_, _, errno := syscall.Syscall(syscall.SYS_FCNTL, f.Fd(), uintptr(syscall.F_PREALLOCATE), uintptr(p))
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if errno == 0 || errno == syscall.ENOTSUP {
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return nil
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}
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// wrong argument to fallocate syscall
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if errno == syscall.EINVAL {
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// filesystem "st_blocks" are allocated in the units of
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// "Allocation Block Size" (run "diskutil info /" command)
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var stat syscall.Stat_t
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syscall.Fstat(int(f.Fd()), &stat)
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// syscall.Statfs_t.Bsize is "optimal transfer block size"
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// and contains matching 4096 value when latest OS X kernel
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// supports 4,096 KB filesystem block size
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var statfs syscall.Statfs_t
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syscall.Fstatfs(int(f.Fd()), &statfs)
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blockSize := int64(statfs.Bsize)
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if stat.Blocks*blockSize >= sizeInBytes {
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// enough blocks are already allocated
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return nil
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}
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}
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return errno
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}
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