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122 lines
3.0 KiB
122 lines
3.0 KiB
// +build linux
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/*
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* Mini Object Storage, (C) 2014 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 scsi
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import (
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"bufio"
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"errors"
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"io/ioutil"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"syscall"
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"github.com/minio/minio/pkg/iodine"
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)
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// Mountinfo container to capture /etc/mtab mount structure
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type Mountinfo struct {
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FSName string /* name of mounted filesystem */
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Dir string /* filesystem path prefix */
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Type string /* mount type (see mntent.h) */
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Opts string /* mount options (see mntent.h) */
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Freq int /* dump frequency in days */
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Passno int /* pass number on parallel fsck */
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}
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var supportedFSType = map[string]bool{
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"ext4": true,
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"xfs": true,
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"ext3": true,
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"btrfs": true,
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"tmpfs": true,
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"nfs": true,
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}
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func isSupportedType(t string) bool {
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_, ok := supportedFSType[t]
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return ok
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}
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// GetMountInfo - get mount info map
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func GetMountInfo() (map[string]Mountinfo, error) {
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f, err := os.Open("/etc/mtab")
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if err != nil {
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return nil, iodine.New(err, nil)
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}
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mntEnt := make(map[string]Mountinfo)
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scanner := bufio.NewScanner(f)
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for scanner.Scan() {
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mtabEnt := strings.Split(scanner.Text(), " ")
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mntInfo := Mountinfo{}
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if len(mtabEnt) == 6 {
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var err error
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if !isSupportedType(mtabEnt[2]) {
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continue
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}
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mntInfo.FSName, err = filepath.EvalSymlinks(mtabEnt[0])
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if err != nil {
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continue
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}
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mntInfo.Dir = mtabEnt[1]
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mntInfo.Type = mtabEnt[2]
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mntInfo.Opts = mtabEnt[3]
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mntInfo.Freq, err = strconv.Atoi(mtabEnt[4])
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if err != nil {
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continue
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}
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mntInfo.Passno, err = strconv.Atoi(mtabEnt[5])
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if err != nil {
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continue
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}
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mntEnt[mntInfo.FSName] = mntInfo
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}
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}
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return mntEnt, nil
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}
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// IsUsable provides a comprehensive way of knowing if the provided mountPath is mounted and writable
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func IsUsable(mountPath string) (bool, error) {
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mntpoint, err := os.Stat(mountPath)
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if err != nil {
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return false, iodine.New(err, nil)
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}
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parent, err := os.Stat(filepath.Join(mountPath, ".."))
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if err != nil {
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return false, iodine.New(err, nil)
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}
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mntpointSt := mntpoint.Sys().(*syscall.Stat_t)
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parentSt := parent.Sys().(*syscall.Stat_t)
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if mntpointSt.Dev == parentSt.Dev {
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return false, iodine.New(errors.New("not mounted"), nil)
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}
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testFile, err := ioutil.TempFile(mountPath, "writetest-")
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if err != nil {
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return false, iodine.New(err, nil)
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}
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testFileName := testFile.Name()
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// close the file, to avoid leaky fd's
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testFile.Close()
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if err := os.Remove(testFileName); err != nil {
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return false, iodine.New(err, nil)
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}
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return true, nil
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}
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