mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-18 04:10:22 +00:00
312 lines
9.1 KiB
Go
312 lines
9.1 KiB
Go
/*
|
|
Copyright 2018 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package rbd
|
|
|
|
import (
|
|
"fmt"
|
|
"io/ioutil"
|
|
"os"
|
|
"path"
|
|
"strconv"
|
|
"strings"
|
|
"time"
|
|
|
|
"github.com/golang/glog"
|
|
"k8s.io/apimachinery/pkg/util/wait"
|
|
)
|
|
|
|
const (
|
|
envHostRootFS = "HOST_ROOTFS"
|
|
)
|
|
|
|
var (
|
|
hostRootFS = "/"
|
|
hasNBD = false
|
|
)
|
|
|
|
func init() {
|
|
host := os.Getenv(envHostRootFS)
|
|
if len(host) > 0 {
|
|
hostRootFS = host
|
|
}
|
|
hasNBD = checkRbdNbdTools()
|
|
}
|
|
|
|
func getDevFromImageAndPool(pool, image string) (string, bool) {
|
|
device, found := getRbdDevFromImageAndPool(pool, image)
|
|
if found {
|
|
return device, true
|
|
}
|
|
device, found = getNbdDevFromImageAndPool(pool, image)
|
|
if found {
|
|
return device, true
|
|
}
|
|
return "", false
|
|
}
|
|
|
|
// Search /sys/bus for rbd device that matches given pool and image.
|
|
func getRbdDevFromImageAndPool(pool string, image string) (string, bool) {
|
|
// /sys/bus/rbd/devices/X/name and /sys/bus/rbd/devices/X/pool
|
|
sysPath := "/sys/bus/rbd/devices"
|
|
if dirs, err := ioutil.ReadDir(sysPath); err == nil {
|
|
for _, f := range dirs {
|
|
// Pool and name format:
|
|
// see rbd_pool_show() and rbd_name_show() at
|
|
// https://github.com/torvalds/linux/blob/master/drivers/block/rbd.c
|
|
name := f.Name()
|
|
// First match pool, then match name.
|
|
poolFile := path.Join(sysPath, name, "pool")
|
|
poolBytes, err := ioutil.ReadFile(poolFile)
|
|
if err != nil {
|
|
glog.V(4).Infof("error reading %s: %v", poolFile, err)
|
|
continue
|
|
}
|
|
if strings.TrimSpace(string(poolBytes)) != pool {
|
|
glog.V(4).Infof("device %s is not %q: %q", name, pool, string(poolBytes))
|
|
continue
|
|
}
|
|
imgFile := path.Join(sysPath, name, "name")
|
|
imgBytes, err := ioutil.ReadFile(imgFile)
|
|
if err != nil {
|
|
glog.V(4).Infof("error reading %s: %v", imgFile, err)
|
|
continue
|
|
}
|
|
if strings.TrimSpace(string(imgBytes)) != image {
|
|
glog.V(4).Infof("device %s is not %q: %q", name, image, string(imgBytes))
|
|
continue
|
|
}
|
|
// Found a match, check if device exists.
|
|
devicePath := "/dev/rbd" + name
|
|
if _, err := os.Lstat(devicePath); err == nil {
|
|
return devicePath, true
|
|
}
|
|
}
|
|
}
|
|
return "", false
|
|
}
|
|
|
|
func getMaxNbds() (int, error) {
|
|
|
|
// the max number of nbd devices may be found in maxNbdsPath
|
|
// we will check sysfs for possible nbd devices even if this is not available
|
|
maxNbdsPath := "/sys/module/nbd/parameters/nbds_max"
|
|
_, err := os.Lstat(maxNbdsPath)
|
|
if err != nil {
|
|
return 0, fmt.Errorf("rbd-nbd: failed to retrieve max_nbds from %s err: %q", maxNbdsPath, err)
|
|
}
|
|
|
|
glog.V(4).Infof("found nbds max parameters file at %s", maxNbdsPath)
|
|
|
|
maxNbdBytes, err := ioutil.ReadFile(maxNbdsPath)
|
|
if err != nil {
|
|
return 0, fmt.Errorf("rbd-nbd: failed to read max_nbds from %s err: %q", maxNbdsPath, err)
|
|
}
|
|
|
|
maxNbds, err := strconv.Atoi(strings.TrimSpace(string(maxNbdBytes)))
|
|
if err != nil {
|
|
return 0, fmt.Errorf("rbd-nbd: failed to read max_nbds err: %q", err)
|
|
}
|
|
|
|
glog.V(4).Infof("rbd-nbd: max_nbds: %d", maxNbds)
|
|
return maxNbds, nil
|
|
}
|
|
|
|
// Locate any existing rbd-nbd process mapping given a <pool, image>.
|
|
// Recent versions of rbd-nbd tool can correctly provide this info using list-mapped
|
|
// but older versions of list-mapped don't.
|
|
// The implementation below peeks at the command line of nbd bound processes
|
|
// to figure out any mapped images.
|
|
func getNbdDevFromImageAndPool(pool string, image string) (string, bool) {
|
|
// nbd module exports the pid of serving process in sysfs
|
|
basePath := "/sys/block/nbd"
|
|
// Do not change imgPath format - some tools like rbd-nbd are strict about it.
|
|
imgPath := fmt.Sprintf("%s/%s", pool, image)
|
|
|
|
maxNbds, maxNbdsErr := getMaxNbds()
|
|
if maxNbdsErr != nil {
|
|
glog.V(4).Infof("error reading nbds_max %v", maxNbdsErr)
|
|
return "", false
|
|
}
|
|
|
|
for i := 0; i < maxNbds; i++ {
|
|
nbdPath := basePath + strconv.Itoa(i)
|
|
_, err := os.Lstat(nbdPath)
|
|
if err != nil {
|
|
glog.V(4).Infof("error reading nbd info directory %s: %v", nbdPath, err)
|
|
continue
|
|
}
|
|
pidBytes, err := ioutil.ReadFile(path.Join(nbdPath, "pid"))
|
|
if err != nil {
|
|
glog.V(5).Infof("did not find valid pid file in dir %s: %v", nbdPath, err)
|
|
continue
|
|
}
|
|
cmdlineFileName := path.Join(hostRootFS, "/proc", strings.TrimSpace(string(pidBytes)), "cmdline")
|
|
rawCmdline, err := ioutil.ReadFile(cmdlineFileName)
|
|
if err != nil {
|
|
glog.V(4).Infof("failed to read cmdline file %s: %v", cmdlineFileName, err)
|
|
continue
|
|
}
|
|
cmdlineArgs := strings.FieldsFunc(string(rawCmdline), func(r rune) bool {
|
|
return r == '\u0000'
|
|
})
|
|
// Check if this process is mapping a rbd device.
|
|
// Only accepted pattern of cmdline is from execRbdMap:
|
|
// rbd-nbd map pool/image ...
|
|
if len(cmdlineArgs) < 3 || cmdlineArgs[0] != "rbd-nbd" || cmdlineArgs[1] != "map" {
|
|
glog.V(4).Infof("nbd device %s is not used by rbd", nbdPath)
|
|
continue
|
|
}
|
|
if cmdlineArgs[2] != imgPath {
|
|
glog.V(4).Infof("rbd-nbd device %s did not match expected image path: %s with path found: %s",
|
|
nbdPath, imgPath, cmdlineArgs[2])
|
|
continue
|
|
}
|
|
devicePath := path.Join("/dev", "nbd"+strconv.Itoa(i))
|
|
if _, err := os.Lstat(devicePath); err != nil {
|
|
glog.Warningf("Stat device %s for imgpath %s failed %v", devicePath, imgPath, err)
|
|
continue
|
|
}
|
|
return devicePath, true
|
|
}
|
|
return "", false
|
|
}
|
|
|
|
// Stat a path, if it doesn't exist, retry maxRetries times.
|
|
func waitForPath(pool, image string, maxRetries int, useNbdDriver bool) (string, bool) {
|
|
for i := 0; i < maxRetries; i++ {
|
|
if i != 0 {
|
|
time.Sleep(time.Second)
|
|
}
|
|
if useNbdDriver {
|
|
if devicePath, found := getNbdDevFromImageAndPool(pool, image); found {
|
|
return devicePath, true
|
|
}
|
|
} else {
|
|
if devicePath, found := getRbdDevFromImageAndPool(pool, image); found {
|
|
return devicePath, true
|
|
}
|
|
}
|
|
}
|
|
return "", false
|
|
}
|
|
|
|
// Check if rbd-nbd tools are installed.
|
|
func checkRbdNbdTools() bool {
|
|
_, err := execCommand("modprobe", []string{"nbd"})
|
|
if err != nil {
|
|
glog.V(3).Infof("rbd-nbd: nbd modprobe failed with error %v", err)
|
|
return false
|
|
}
|
|
if _, err := execCommand("rbd-nbd", []string{"--version"}); err != nil {
|
|
glog.V(3).Infof("rbd-nbd: running rbd-nbd --version failed with error %v", err)
|
|
return false
|
|
}
|
|
glog.V(3).Infof("rbd-nbd tools were found.")
|
|
return true
|
|
}
|
|
|
|
func attachRBDImage(volOptions *rbdVolume, userId string, credentials map[string]string) (string, error) {
|
|
var err error
|
|
var output []byte
|
|
|
|
image := volOptions.VolName
|
|
imagePath := fmt.Sprintf("%s/%s", volOptions.Pool, image)
|
|
|
|
useNBD := false
|
|
cmdName := "rbd"
|
|
moduleName := "rbd"
|
|
if volOptions.Mounter == "rbd-nbd" && hasNBD {
|
|
useNBD = true
|
|
cmdName = "rbd-nbd"
|
|
moduleName = "nbd"
|
|
}
|
|
|
|
devicePath, found := waitForPath(volOptions.Pool, image, 1, useNBD)
|
|
if !found {
|
|
attachdetachMutex.LockKey(string(imagePath))
|
|
defer attachdetachMutex.UnlockKey(string(imagePath))
|
|
|
|
_, err = execCommand("modprobe", []string{moduleName})
|
|
if err != nil {
|
|
glog.Warningf("rbd: failed to load rbd kernel module:%v", err)
|
|
}
|
|
|
|
backoff := wait.Backoff{
|
|
Duration: rbdImageWatcherInitDelay,
|
|
Factor: rbdImageWatcherFactor,
|
|
Steps: rbdImageWatcherSteps,
|
|
}
|
|
err := wait.ExponentialBackoff(backoff, func() (bool, error) {
|
|
used, rbdOutput, err := rbdStatus(volOptions, userId, credentials)
|
|
if err != nil {
|
|
return false, fmt.Errorf("fail to check rbd image status with: (%v), rbd output: (%s)", err, rbdOutput)
|
|
}
|
|
return !used, nil
|
|
})
|
|
// return error if rbd image has not become available for the specified timeout
|
|
if err == wait.ErrWaitTimeout {
|
|
return "", fmt.Errorf("rbd image %s is still being used", imagePath)
|
|
}
|
|
// return error if any other errors were encountered during wating for the image to become available
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
mon, err := getMon(volOptions, credentials)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
glog.V(5).Infof("rbd: map mon %s", mon)
|
|
key, err := getRBDKey(userId, credentials)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
output, err = execCommand(cmdName, []string{
|
|
"map", imagePath, "--id", userId, "-m", mon, "--key=" + key})
|
|
if err != nil {
|
|
glog.Warningf("rbd: map error %v, rbd output: %s", err, string(output))
|
|
return "", fmt.Errorf("rbd: map failed %v, rbd output: %s", err, string(output))
|
|
}
|
|
devicePath, found = waitForPath(volOptions.Pool, image, 10, useNBD)
|
|
if !found {
|
|
return "", fmt.Errorf("Could not map image %s, Timeout after 10s", imagePath)
|
|
}
|
|
}
|
|
|
|
return devicePath, nil
|
|
}
|
|
|
|
func detachRBDDevice(devicePath string) error {
|
|
var err error
|
|
var output []byte
|
|
|
|
glog.V(3).Infof("rbd: unmap device %s", devicePath)
|
|
|
|
cmdName := "rbd"
|
|
if strings.HasPrefix(devicePath, "/dev/nbd") {
|
|
cmdName = "rbd-nbd"
|
|
}
|
|
|
|
output, err = execCommand(cmdName, []string{"unmap", devicePath})
|
|
if err != nil {
|
|
return fmt.Errorf("rbd: unmap failed %v, rbd output: %s", err, string(output))
|
|
}
|
|
|
|
return nil
|
|
}
|