mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-09-19 15:09:56 +00:00
372 lines
11 KiB
Go
372 lines
11 KiB
Go
/*
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Copyright 2018 The Kubernetes 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 rbd
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import (
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"encoding/json"
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"fmt"
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"github.com/golang/glog"
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"io/ioutil"
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"k8s.io/apimachinery/pkg/util/wait"
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"k8s.io/kubernetes/pkg/util/keymutex"
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"os"
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"os/exec"
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"path"
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"strings"
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"time"
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)
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const (
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imageWatcherStr = "watcher="
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rbdImageFormat1 = "1"
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rbdImageFormat2 = "2"
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imageSizeStr = "size "
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sizeDivStr = " MB in"
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kubeLockMagic = "kubelet_lock_magic_"
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// The following three values are used for 30 seconds timeout
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// while waiting for RBD Watcher to expire.
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rbdImageWatcherInitDelay = 1 * time.Second
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rbdImageWatcherFactor = 1.4
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rbdImageWatcherSteps = 10
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)
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type rbdVolumeOptions struct {
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VolName string `json:"volName"`
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Monitors string `json:"monitors"`
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Pool string `json:"pool"`
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AdminID string `json:"adminID"`
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AdminSecret string `json:"adminSecret"`
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UserID string `json:"userID"`
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UserSecret string `json:"userSecret"`
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ImageFormat string `json:"imageFormat"`
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ImageFeatures []string `json:"imageFeatures"`
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}
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var attachdetachMutex = keymutex.NewKeyMutex()
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// CreateImage creates a new ceph image with provision and volume options.
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func createRBDImage(pOpts *rbdVolumeOptions, volSz int) error {
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var output []byte
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var err error
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// rbd create
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mon := pOpts.Monitors
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image := pOpts.VolName
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volSzGB := fmt.Sprintf("%dG", volSz)
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if pOpts.ImageFormat == rbdImageFormat2 {
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glog.V(4).Infof("rbd: create %s size %s format %s (features: %s) using mon %s, pool %s id %s key %s", image, volSzGB, pOpts.ImageFormat, pOpts.ImageFeatures, mon, pOpts.Pool, pOpts.AdminID, pOpts.AdminSecret)
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} else {
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glog.V(4).Infof("rbd: create %s size %s format %s using mon %s, pool %s id %s key %s", image, volSzGB, pOpts.ImageFormat, mon, pOpts.Pool, pOpts.AdminID, pOpts.AdminSecret)
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}
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args := []string{"create", image, "--size", volSzGB, "--pool", pOpts.Pool, "--id", pOpts.AdminID, "-m", mon, "--key=" + pOpts.AdminSecret, "--image-format", pOpts.ImageFormat}
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if pOpts.ImageFormat == rbdImageFormat2 {
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// if no image features is provided, it results in empty string
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// which disable all RBD image format 2 features as we expected
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features := strings.Join(pOpts.ImageFeatures, ",")
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args = append(args, "--image-feature", features)
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}
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output, err = execCommand("rbd", args)
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if err != nil {
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return fmt.Errorf("failed to create rbd image: %v, command output: %s", err, string(output))
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}
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return nil
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}
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// rbdStatus checks if there is watcher on the image.
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// It returns true if there is a watcher onthe image, otherwise returns false.
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func rbdStatus(b *rbdVolumeOptions) (bool, string, error) {
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var err error
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var output string
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var cmd []byte
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image := b.VolName
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// If we don't have admin id/secret (e.g. attaching), fallback to user id/secret.
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id := b.AdminID
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secret := b.AdminSecret
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if id == "" {
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id = b.UserID
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secret = b.UserSecret
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}
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glog.V(4).Infof("rbd: status %s using mon %s, pool %s id %s key %s", image, b.Monitors, b.Pool, id, secret)
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args := []string{"status", image, "--pool", b.Pool, "-m", b.Monitors, "--id", id, "--key=" + secret}
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cmd, err = execCommand("rbd", args)
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output = string(cmd)
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if err, ok := err.(*exec.Error); ok {
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if err.Err == exec.ErrNotFound {
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glog.Errorf("rbd cmd not found")
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// fail fast if command not found
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return false, output, err
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}
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}
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// If command never succeed, returns its last error.
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if err != nil {
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return false, output, err
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}
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if strings.Contains(output, imageWatcherStr) {
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glog.V(4).Infof("rbd: watchers on %s: %s", image, output)
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return true, output, nil
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} else {
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glog.Warningf("rbd: no watchers on %s", image)
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return false, output, nil
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}
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}
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// DeleteImage deletes a ceph image with provision and volume options.
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func deleteRBDImage(b *rbdVolumeOptions) error {
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var output []byte
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image := b.VolName
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found, _, err := rbdStatus(b)
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if err != nil {
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return err
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}
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if found {
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glog.Info("rbd is still being used ", image)
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return fmt.Errorf("rbd %s is still being used", image)
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}
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id := b.AdminID
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secret := b.AdminSecret
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if id == "" {
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id = b.UserID
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secret = b.UserSecret
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}
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glog.V(4).Infof("rbd: rm %s using mon %s, pool %s id %s key %s", image, b.Monitors, b.Pool, id, secret)
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args := []string{"rm", image, "--pool", b.Pool, "--id", id, "-m", b.Monitors, "--key=" + secret}
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output, err = execCommand("rbd", args)
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if err == nil {
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return nil
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}
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glog.Errorf("failed to delete rbd image: %v, command output: %s", err, string(output))
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return err
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}
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func execCommand(command string, args []string) ([]byte, error) {
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cmd := exec.Command(command, args...)
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return cmd.CombinedOutput()
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}
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func getRBDVolumeOptions(volOptions map[string]string) (*rbdVolumeOptions, error) {
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rbdVolume := &rbdVolumeOptions{}
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var ok bool
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rbdVolume.AdminID, ok = volOptions["adminID"]
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if !ok {
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return nil, fmt.Errorf("Missing required parameter adminID")
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}
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rbdVolume.AdminSecret, ok = volOptions["adminSecret"]
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if !ok {
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return nil, fmt.Errorf("Missing required parameter adminSecret")
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}
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rbdVolume.Pool, ok = volOptions["pool"]
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if !ok {
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return nil, fmt.Errorf("Missing required parameter pool")
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}
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rbdVolume.Monitors, ok = volOptions["monitors"]
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if !ok {
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return nil, fmt.Errorf("Missing required parameter monitors")
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}
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rbdVolume.UserID, ok = volOptions["userID"]
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if !ok {
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return nil, fmt.Errorf("Missing required parameter userID")
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}
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rbdVolume.UserSecret, ok = volOptions["userSecret"]
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if !ok {
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return nil, fmt.Errorf("Missing required parameter userSecret")
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}
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rbdVolume.ImageFormat, ok = volOptions["imageFormat"]
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if !ok {
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rbdVolume.ImageFormat = "2"
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}
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return rbdVolume, nil
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}
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func attachRBDImage(volOptions *rbdVolumeOptions) (string, error) {
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var err error
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var output []byte
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image := volOptions.VolName
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devicePath, found := waitForPath(volOptions.Pool, image, 1)
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if !found {
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attachdetachMutex.LockKey(string(volOptions.Pool + image))
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defer attachdetachMutex.UnlockKey(string(volOptions.Pool + image))
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_, err = execCommand("modprobe", []string{"rbd"})
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if err != nil {
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glog.Warningf("rbd: failed to load rbd kernel module:%v", err)
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}
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backoff := wait.Backoff{
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Duration: rbdImageWatcherInitDelay,
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Factor: rbdImageWatcherFactor,
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Steps: rbdImageWatcherSteps,
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}
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err := wait.ExponentialBackoff(backoff, func() (bool, error) {
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used, rbdOutput, err := rbdStatus(volOptions)
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if err != nil {
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return false, fmt.Errorf("fail to check rbd image status with: (%v), rbd output: (%s)", err, rbdOutput)
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}
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return !used, nil
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})
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// return error if rbd image has not become available for the specified timeout
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if err == wait.ErrWaitTimeout {
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return "", fmt.Errorf("rbd image %s/%s is still being used", volOptions.Pool, image)
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}
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// return error if any other errors were encountered during wating for the image to becme avialble
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if err != nil {
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return "", err
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}
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glog.V(1).Infof("rbd: map mon %s", volOptions.Monitors)
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id := volOptions.UserID
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secret := volOptions.UserSecret
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output, err = execCommand("rbd", []string{
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"map", image, "--pool", volOptions.Pool, "--id", id, "-m", volOptions.Monitors, "--key=" + secret})
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if err != nil {
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glog.V(1).Infof("rbd: map error %v, rbd output: %s", err, string(output))
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return "", fmt.Errorf("rbd: map failed %v, rbd output: %s", err, string(output))
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}
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devicePath, found = waitForPath(volOptions.Pool, image, 10)
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if !found {
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return "", fmt.Errorf("Could not map image %s/%s, Timeout after 10s", volOptions.Pool, image)
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}
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}
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return devicePath, nil
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}
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func detachRBDImage(volOptions *rbdVolumeOptions) error {
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var err error
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var output []byte
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image := volOptions.VolName
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glog.V(1).Infof("rbd: unmap device %s", image)
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id := volOptions.UserID
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secret := volOptions.UserSecret
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output, err = execCommand("rbd", []string{
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"unmap", image, "--id", id, "--key=" + secret})
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if err != nil {
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glog.V(1).Infof("rbd: unmap error %v, rbd output: %s", err, string(output))
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return fmt.Errorf("rbd: unmap failed %v, rbd output: %s", err, string(output))
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}
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return nil
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}
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func getDevFromImageAndPool(pool, image string) (string, bool) {
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// /sys/bus/rbd/devices/X/name and /sys/bus/rbd/devices/X/pool
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sys_path := "/sys/bus/rbd/devices"
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if dirs, err := ioutil.ReadDir(sys_path); err == nil {
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for _, f := range dirs {
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name := f.Name()
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// first match pool, then match name
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poolFile := path.Join(sys_path, name, "pool")
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poolBytes, err := ioutil.ReadFile(poolFile)
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if err != nil {
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glog.V(4).Infof("Error reading %s: %v", poolFile, err)
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continue
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}
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if strings.TrimSpace(string(poolBytes)) != pool {
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glog.V(4).Infof("Device %s is not %q: %q", name, pool, string(poolBytes))
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continue
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}
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imgFile := path.Join(sys_path, name, "name")
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imgBytes, err := ioutil.ReadFile(imgFile)
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if err != nil {
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glog.V(4).Infof("Error reading %s: %v", imgFile, err)
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continue
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}
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if strings.TrimSpace(string(imgBytes)) != image {
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glog.V(4).Infof("Device %s is not %q: %q", name, image, string(imgBytes))
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continue
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}
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// found a match, check if device exists
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devicePath := "/dev/rbd" + name
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if _, err := os.Lstat(devicePath); err == nil {
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return devicePath, true
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}
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}
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}
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return "", false
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}
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// stat a path, if not exists, retry maxRetries times
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func waitForPath(pool, image string, maxRetries int) (string, bool) {
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for i := 0; i < maxRetries; i++ {
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devicePath, found := getDevFromImageAndPool(pool, image)
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if found {
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return devicePath, true
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}
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if i == maxRetries-1 {
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break
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}
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time.Sleep(time.Second)
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}
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return "", false
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}
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func persistVolInfo(image string, persistentStoragePath string, volInfo *rbdVolumeOptions) error {
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file := path.Join(persistentStoragePath, image+".json")
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fp, err := os.Create(file)
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if err != nil {
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return fmt.Errorf("rbd: create err %s/%s", file, err)
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}
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defer fp.Close()
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encoder := json.NewEncoder(fp)
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if err = encoder.Encode(volInfo); err != nil {
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return fmt.Errorf("rbd: encode err: %v.", err)
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}
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return nil
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}
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func loadVolInfo(image string, persistentStoragePath string, volInfo *rbdVolumeOptions) error {
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file := path.Join(persistentStoragePath, image+".json")
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fp, err := os.Open(file)
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if err != nil {
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return fmt.Errorf("rbd: open err %s/%s", file, err)
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}
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defer fp.Close()
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decoder := json.NewDecoder(fp)
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if err = decoder.Decode(volInfo); err != nil {
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return fmt.Errorf("rbd: decode err: %v.", err)
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}
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return nil
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}
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func deleteVolInfo(image string, persistentStoragePath string) error {
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file := path.Join(persistentStoragePath, image+".json")
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err := os.Remove(file)
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if err != nil {
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if err != os.ErrNotExist {
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return fmt.Errorf("rbd: open err %s/%s", file, err)
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}
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}
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return nil
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}
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