mirror of
https://github.com/TECHNOFAB11/zfs-localpv.git
synced 2025-12-12 06:20:11 +01:00
112 lines
3.4 KiB
Go
112 lines
3.4 KiB
Go
/*
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Copyright 2020 The OpenEBS Authors
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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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http://www.apache.org/licenses/LICENSE-2.0
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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 xfs
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import (
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"github.com/openebs/zfs-localpv/pkg/mount"
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"os"
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"os/exec"
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"path/filepath"
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"strings"
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"k8s.io/klog"
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)
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func xfsTempMount(device string) error {
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pvol := strings.Split(device, "/")
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volname := pvol[len(pvol)-1]
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// evaluate the symlink to get the dev path for volume
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dev, err := filepath.EvalSymlinks(device)
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if err != nil {
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return err
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}
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// create a temporary directory to mount the xfs file system
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tmpdir := "/tmp/" + volname
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err = os.Mkdir(tmpdir, 0755)
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if os.IsNotExist(err) {
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klog.Errorf("xfs: failed to create tmpdir %s error: %s", tmpdir, err.Error())
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return err
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}
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/*
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* Device might have already mounted at the tmp path but umount might have failed
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* in previous attempt. Checking here if device is not mounted then only attempt
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* to mount it, otherwise proceed with the umount.
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*/
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curMounts, err := mount.GetMounts(dev)
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if err != nil {
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klog.Errorf("xfs: get mounts failed dev: %s err: %v", device, err.Error())
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return err
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} else if len(curMounts) == 0 {
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// mount with nouuid, so that it can play the log
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cmd := exec.Command("mount", "-o", "nouuid", device, tmpdir)
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out, err := cmd.CombinedOutput()
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if err != nil {
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klog.Errorf("xfs: failed to mount device %s => %s error: %s", device, tmpdir, string(out))
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return err
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}
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} else {
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klog.Infof("xfs: device already mounted %s => [%v]", device, curMounts)
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}
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// log has been replayed, unmount the volume
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cmd := exec.Command("umount", tmpdir)
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out, err := cmd.CombinedOutput()
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if err != nil {
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klog.Errorf("xfs: failed to umount tmpdir %s error: %s", tmpdir, string(out))
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return err
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}
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// remove the tmp directory
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err = os.Remove(tmpdir)
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if err != nil {
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// don't return error, reconciliation is not needed as umount is done
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klog.Errorf("xfs: failed to remove tmpdir %s error: %s", tmpdir, err.Error())
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}
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return nil
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}
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/*
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* We have to generate a new UUID for the cloned volumes with xfs filesystem
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* otherwise system won't let anyone mount it if UUID is same. Here, since cloned
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* volume refers to the same block because of the way ZFS clone works, it will
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* also have the same UUID.
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* There might be something there in the xfs log, we have to clear them
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* so that filesystem is clean and we can generate the UUID for it.
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*/
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// GenerateUUID generates a new UUID for the given device
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func GenerateUUID(device string) error {
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// temporary mount the volume with nouuid to replay the logs
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err := xfsTempMount(device)
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if err != nil {
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return err
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}
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// for mounting the cloned volume for xfs, a new UUID has to be generated
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cmd := exec.Command("xfs_admin", "-U", "generate", device)
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out, err := cmd.CombinedOutput()
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if err != nil {
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klog.Errorf("xfs: uuid generate failed for device %s error: %s", device, string(out))
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return err
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}
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klog.Infof("xfs: generated UUID for the device %s \n %v", device, string(out))
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return nil
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}
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