mirror of
https://github.com/cubefs/cubefs.git
synced 2026-08-02 02:00:56 +00:00
91 lines
2.0 KiB
Go
91 lines
2.0 KiB
Go
// Copyright 2018 The CubeFS 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
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// implied. See the License for the specific language governing
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// permissions and limitations under the License.
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package tmpfs
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import (
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"fmt"
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"os"
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"path/filepath"
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"strconv"
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"syscall"
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)
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const (
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TmpfsMagic = 0x1021994
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)
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func IsMountPoint(path string) (isMountPoint bool, err error) {
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parrentPath := filepath.Dir(path)
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if parrentPath == path {
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return true, nil
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}
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parrentDev, err := getDevName(parrentPath)
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if err != nil {
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return
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}
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dev, err := getDevName(path)
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if err != nil {
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return
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}
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if parrentDev != dev {
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return true, nil
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}
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return false, nil
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}
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func getDevName(path string) (dev uint64, err error) {
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if path == "" {
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return 0, fmt.Errorf("empty path")
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}
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statFS := &syscall.Stat_t{}
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err = syscall.Stat(path, statFS)
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if err != nil {
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return 0, err
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}
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return statFS.Dev, nil
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}
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func MountTmpfs(path string, size int64) error {
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if size < 0 {
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panic("MountTmpfs: size < 0")
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}
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var flags uintptr
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flags = syscall.MS_NOATIME | syscall.MS_SILENT
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flags |= syscall.MS_NODEV | syscall.MS_NOEXEC | syscall.MS_NOSUID
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options := ""
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if size >= 0 {
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options = "size=" + strconv.FormatInt(size, 10)
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}
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err := syscall.Mount("tmpfs", path, "tmpfs", flags, options)
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return os.NewSyscallError("mount", err)
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}
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func Umount(path string) error {
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return syscall.Unmount(path, syscall.MNT_FORCE)
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}
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func IsTmpfs(path string) bool {
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return isFs(path, TmpfsMagic)
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}
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func isFs(path string, magic int64) bool {
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var stat syscall.Statfs_t
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err := syscall.Statfs(path, &stat)
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if err != nil {
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panic(os.NewSyscallError("statfs", err))
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}
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return stat.Type == magic
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}
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