mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-23 23:00:19 +00:00
312 lines
9.1 KiB
Go
312 lines
9.1 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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"fmt"
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"io/ioutil"
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"os"
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"path"
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"strconv"
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"strings"
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"time"
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"github.com/golang/glog"
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"k8s.io/apimachinery/pkg/util/wait"
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)
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const (
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envHostRootFS = "HOST_ROOTFS"
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)
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var (
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hostRootFS = "/"
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hasNBD = false
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)
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func init() {
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host := os.Getenv(envHostRootFS)
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if len(host) > 0 {
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hostRootFS = host
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}
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hasNBD = checkRbdNbdTools()
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}
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func getDevFromImageAndPool(pool, image string) (string, bool) {
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device, found := getRbdDevFromImageAndPool(pool, image)
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if found {
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return device, true
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}
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device, found = getNbdDevFromImageAndPool(pool, image)
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if found {
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return device, true
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}
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return "", false
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}
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// Search /sys/bus for rbd device that matches given pool and image.
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func getRbdDevFromImageAndPool(pool string, 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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// Pool and name format:
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// see rbd_pool_show() and rbd_name_show() at
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// https://github.com/torvalds/linux/blob/master/drivers/block/rbd.c
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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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func getMaxNbds() (int, error) {
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// the max number of nbd devices may be found in maxNbdsPath
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// we will check sysfs for possible nbd devices even if this is not available
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maxNbdsPath := "/sys/module/nbd/parameters/nbds_max"
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_, err := os.Lstat(maxNbdsPath)
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if err != nil {
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return 0, fmt.Errorf("rbd-nbd: failed to retrieve max_nbds from %s err: %q", maxNbdsPath, err)
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}
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glog.V(4).Infof("found nbds max parameters file at %s", maxNbdsPath)
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maxNbdBytes, err := ioutil.ReadFile(maxNbdsPath)
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if err != nil {
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return 0, fmt.Errorf("rbd-nbd: failed to read max_nbds from %s err: %q", maxNbdsPath, err)
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}
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maxNbds, err := strconv.Atoi(strings.TrimSpace(string(maxNbdBytes)))
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if err != nil {
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return 0, fmt.Errorf("rbd-nbd: failed to read max_nbds err: %q", err)
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}
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glog.V(4).Infof("rbd-nbd: max_nbds: %d", maxNbds)
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return maxNbds, nil
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}
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// Locate any existing rbd-nbd process mapping given a <pool, image>.
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// Recent versions of rbd-nbd tool can correctly provide this info using list-mapped
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// but older versions of list-mapped don't.
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// The implementation below peeks at the command line of nbd bound processes
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// to figure out any mapped images.
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func getNbdDevFromImageAndPool(pool string, image string) (string, bool) {
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// nbd module exports the pid of serving process in sysfs
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basePath := "/sys/block/nbd"
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// Do not change imgPath format - some tools like rbd-nbd are strict about it.
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imgPath := fmt.Sprintf("%s/%s", pool, image)
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maxNbds, maxNbdsErr := getMaxNbds()
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if maxNbdsErr != nil {
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glog.V(4).Infof("error reading nbds_max %v", maxNbdsErr)
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return "", false
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}
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for i := 0; i < maxNbds; i++ {
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nbdPath := basePath + strconv.Itoa(i)
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_, err := os.Lstat(nbdPath)
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if err != nil {
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glog.V(4).Infof("error reading nbd info directory %s: %v", nbdPath, err)
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continue
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}
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pidBytes, err := ioutil.ReadFile(path.Join(nbdPath, "pid"))
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if err != nil {
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glog.V(5).Infof("did not find valid pid file in dir %s: %v", nbdPath, err)
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continue
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}
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cmdlineFileName := path.Join(hostRootFS, "/proc", strings.TrimSpace(string(pidBytes)), "cmdline")
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rawCmdline, err := ioutil.ReadFile(cmdlineFileName)
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if err != nil {
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glog.V(4).Infof("failed to read cmdline file %s: %v", cmdlineFileName, err)
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continue
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}
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cmdlineArgs := strings.FieldsFunc(string(rawCmdline), func(r rune) bool {
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return r == '\u0000'
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})
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// Check if this process is mapping a rbd device.
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// Only accepted pattern of cmdline is from execRbdMap:
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// rbd-nbd map pool/image ...
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if len(cmdlineArgs) < 3 || cmdlineArgs[0] != "rbd-nbd" || cmdlineArgs[1] != "map" {
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glog.V(4).Infof("nbd device %s is not used by rbd", nbdPath)
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continue
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}
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if cmdlineArgs[2] != imgPath {
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glog.V(4).Infof("rbd-nbd device %s did not match expected image path: %s with path found: %s",
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nbdPath, imgPath, cmdlineArgs[2])
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continue
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}
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devicePath := path.Join("/dev", "nbd"+strconv.Itoa(i))
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if _, err := os.Lstat(devicePath); err != nil {
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glog.Warningf("Stat device %s for imgpath %s failed %v", devicePath, imgPath, err)
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continue
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}
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return devicePath, true
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}
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return "", false
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}
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// Stat a path, if it doesn't exist, retry maxRetries times.
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func waitForPath(pool, image string, maxRetries int, useNbdDriver bool) (string, bool) {
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for i := 0; i < maxRetries; i++ {
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if i != 0 {
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time.Sleep(time.Second)
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}
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if useNbdDriver {
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if devicePath, found := getNbdDevFromImageAndPool(pool, image); found {
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return devicePath, true
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}
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} else {
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if devicePath, found := getRbdDevFromImageAndPool(pool, image); found {
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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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// Check if rbd-nbd tools are installed.
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func checkRbdNbdTools() bool {
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_, err := execCommand("modprobe", []string{"nbd"})
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if err != nil {
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glog.V(3).Infof("rbd-nbd: nbd modprobe failed with error %v", err)
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return false
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}
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if _, err := execCommand("rbd-nbd", []string{"--version"}); err != nil {
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glog.V(3).Infof("rbd-nbd: running rbd-nbd --version failed with error %v", err)
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return false
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}
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glog.V(3).Infof("rbd-nbd tools were found.")
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return true
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}
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func attachRBDImage(volOptions *rbdVolume, userId string, credentials map[string]string) (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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imagePath := fmt.Sprintf("%s/%s", volOptions.Pool, image)
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useNBD := false
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cmdName := "rbd"
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moduleName := "rbd"
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if volOptions.Mounter == "rbd-nbd" && hasNBD {
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useNBD = true
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cmdName = "rbd-nbd"
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moduleName = "nbd"
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}
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devicePath, found := waitForPath(volOptions.Pool, image, 1, useNBD)
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if !found {
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attachdetachMutex.LockKey(string(imagePath))
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defer attachdetachMutex.UnlockKey(string(imagePath))
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_, err = execCommand("modprobe", []string{moduleName})
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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, userId, credentials)
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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 is still being used", imagePath)
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}
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// return error if any other errors were encountered during wating for the image to become available
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if err != nil {
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return "", err
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}
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mon, err := getMon(volOptions, credentials)
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if err != nil {
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return "", err
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}
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glog.V(5).Infof("rbd: map mon %s", mon)
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key, err := getRBDKey(userId, credentials)
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if err != nil {
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return "", err
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}
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output, err = execCommand(cmdName, []string{
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"map", imagePath, "--id", userId, "-m", mon, "--key=" + key})
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if err != nil {
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glog.Warningf("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, useNBD)
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if !found {
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return "", fmt.Errorf("Could not map image %s, Timeout after 10s", imagePath)
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}
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}
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return devicePath, nil
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}
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func detachRBDDevice(devicePath string) error {
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var err error
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var output []byte
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glog.V(3).Infof("rbd: unmap device %s", devicePath)
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cmdName := "rbd"
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if strings.HasPrefix(devicePath, "/dev/nbd") {
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cmdName = "rbd-nbd"
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}
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output, err = execCommand(cmdName, []string{"unmap", devicePath})
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if err != nil {
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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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