699 lines
20 KiB
Go
699 lines
20 KiB
Go
// Copyright (c) Vitaliy Filippov, 2019+
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// License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
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package vitastor
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import (
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"context"
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"errors"
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"encoding/json"
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"fmt"
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"os"
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"os/exec"
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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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"time"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/status"
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"k8s.io/utils/mount"
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utilexec "k8s.io/utils/exec"
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"github.com/container-storage-interface/spec/lib/go/csi"
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"github.com/kubernetes-csi/csi-lib-utils/protosanitizer"
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"k8s.io/klog"
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)
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// NodeServer struct of Vitastor CSI driver with supported methods of CSI node server spec.
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type NodeServer struct
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{
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*Driver
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useVduse bool
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stateDir string
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mounter mount.Interface
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restartInterval time.Duration
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}
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type DeviceState struct
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{
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ConfigPath string `json:"configPath"`
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VdpaId string `json:"vdpaId"`
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Image string `json:"image"`
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Blockdev string `json:"blockdev"`
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Readonly bool `json:"readonly"`
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PidFile string `json:"pidFile"`
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}
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// NewNodeServer create new instance node
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func NewNodeServer(driver *Driver) *NodeServer
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{
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stateDir := os.Getenv("STATE_DIR")
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if (stateDir == "")
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{
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stateDir = "/run/vitastor-csi"
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}
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if (stateDir[len(stateDir)-1] != '/')
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{
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stateDir += "/"
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}
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ns := &NodeServer{
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Driver: driver,
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useVduse: checkVduseSupport(),
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stateDir: stateDir,
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mounter: mount.New(""),
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}
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if (ns.useVduse)
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{
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ns.restoreVduseDaemons()
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dur, err := time.ParseDuration(os.Getenv("RESTART_INTERVAL"))
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if (err != nil)
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{
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dur = 10 * time.Second
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}
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ns.restartInterval = dur
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if (ns.restartInterval != time.Duration(0))
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{
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go ns.restarter()
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}
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}
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return ns
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}
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func checkVduseSupport() bool
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{
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// Check VDUSE support (vdpa, vduse, virtio-vdpa kernel modules)
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vduse := true
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for _, mod := range []string{"vdpa", "vduse", "virtio-vdpa"}
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{
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_, err := os.Stat("/sys/module/"+mod)
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if (err != nil)
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{
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if (!errors.Is(err, os.ErrNotExist))
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{
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klog.Errorf("failed to check /sys/module/%s: %v", mod, err)
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}
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c := exec.Command("/sbin/modprobe", mod)
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c.Stdout = os.Stderr
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c.Stderr = os.Stderr
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err := c.Run()
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if (err != nil)
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{
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klog.Errorf("/sbin/modprobe %s failed: %v", mod, err)
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vduse = false
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break
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}
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}
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}
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// Check that vdpa tool functions
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if (vduse)
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{
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c := exec.Command("/sbin/vdpa", "-j", "dev")
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c.Stderr = os.Stderr
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err := c.Run()
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if (err != nil)
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{
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klog.Errorf("/sbin/vdpa -j dev failed: %v", err)
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vduse = false
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}
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}
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if (!vduse)
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{
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klog.Errorf(
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"Your host apparently has no VDUSE support. VDUSE support disabled, NBD will be used to map devices."+
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" For VDUSE you need at least Linux 5.15 and the following kernel modules: vdpa, virtio-vdpa, vduse.",
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)
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}
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return vduse
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}
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// NodeStageVolume mounts the volume to a staging path on the node.
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func (ns *NodeServer) NodeStageVolume(ctx context.Context, req *csi.NodeStageVolumeRequest) (*csi.NodeStageVolumeResponse, error)
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{
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return &csi.NodeStageVolumeResponse{}, nil
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}
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// NodeUnstageVolume unstages the volume from the staging path
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func (ns *NodeServer) NodeUnstageVolume(ctx context.Context, req *csi.NodeUnstageVolumeRequest) (*csi.NodeUnstageVolumeResponse, error)
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{
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return &csi.NodeUnstageVolumeResponse{}, nil
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}
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func Contains(list []string, s string) bool
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{
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for i := 0; i < len(list); i++
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{
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if (list[i] == s)
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{
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return true
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}
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}
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return false
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}
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func (ns *NodeServer) mapNbd(volName string, ctxVars map[string]string, readonly bool) (string, error)
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{
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// Map NBD device
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// FIXME: Check if already mapped
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args := []string{
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"map", "--image", volName,
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}
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if (ctxVars["configPath"] != "")
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{
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args = append(args, "--config_path", ctxVars["configPath"])
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}
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if (readonly)
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{
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args = append(args, "--readonly", "1")
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}
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stdout, stderr, err := system("/usr/bin/vitastor-nbd", args...)
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dev := strings.TrimSpace(string(stdout))
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if (dev == "")
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{
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return "", fmt.Errorf("vitastor-nbd did not return the name of NBD device. output: %s", stderr)
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}
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return dev, err
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}
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func (ns *NodeServer) unmapNbd(devicePath string)
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{
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// unmap NBD device
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unmapOut, unmapErr := exec.Command("/usr/bin/vitastor-nbd", "unmap", devicePath).CombinedOutput()
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if (unmapErr != nil)
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{
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klog.Errorf("failed to unmap NBD device %s: %s, error: %v", devicePath, unmapOut, unmapErr)
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}
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}
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func findByPidFile(pidFile string) (*os.Process, error)
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{
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pidBuf, err := os.ReadFile(pidFile)
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if (err != nil)
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{
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return nil, err
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}
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pid, err := strconv.ParseInt(strings.TrimSpace(string(pidBuf)), 0, 64)
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if (err != nil)
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{
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return nil, err
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}
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proc, err := os.FindProcess(int(pid))
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if (err != nil)
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{
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return nil, err
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}
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return proc, nil
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}
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func killByPidFile(pidFile string) error
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{
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klog.Infof("killing process with PID from file %s", pidFile)
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proc, err := findByPidFile(pidFile)
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if (err != nil)
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{
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return err
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}
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return proc.Signal(syscall.SIGTERM)
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}
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func startStorageDaemon(vdpaId, volName, pidFile, configPath string, readonly bool) error
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{
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// Start qemu-storage-daemon
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blockSpec := map[string]interface{}{
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"node-name": "disk1",
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"driver": "vitastor",
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"image": volName,
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"cache": map[string]bool{
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"direct": true,
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"no-flush": false,
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},
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"discard": "unmap",
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}
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if (configPath != "")
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{
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blockSpec["config-path"] = configPath
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}
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blockSpecJson, _ := json.Marshal(blockSpec)
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writable := "true"
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if (readonly)
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{
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writable = "false"
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}
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_, _, err := system(
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"/usr/bin/qemu-storage-daemon", "--daemonize", "--pidfile", pidFile, "--blockdev", string(blockSpecJson),
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"--export", "vduse-blk,id="+vdpaId+",node-name=disk1,name="+vdpaId+",num-queues=16,queue-size=128,writable="+writable,
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)
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return err
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}
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func (ns *NodeServer) mapVduse(volName string, ctxVars map[string]string, readonly bool) (string, string, error)
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{
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// Generate state file
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stateFd, err := os.CreateTemp(ns.stateDir, "vitastor-vduse-*.json")
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if (err != nil)
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{
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return "", "", err
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}
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stateFile := stateFd.Name()
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stateFd.Close()
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vdpaId := filepath.Base(stateFile)
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vdpaId = vdpaId[0:len(vdpaId)-5] // remove ".json"
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pidFile := ns.stateDir + vdpaId + ".pid"
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// Map VDUSE device via qemu-storage-daemon
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err = startStorageDaemon(vdpaId, volName, pidFile, ctxVars["configPath"], readonly)
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if (err == nil)
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{
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// Add device to VDPA bus
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_, _, err = system("/sbin/vdpa", "-j", "dev", "add", "name", vdpaId, "mgmtdev", "vduse")
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if (err == nil)
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{
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// Find block device name
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var matches []string
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matches, err = filepath.Glob("/sys/bus/vdpa/devices/"+vdpaId+"/virtio*/block/*")
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if (err == nil && len(matches) == 0)
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{
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err = errors.New("/sys/bus/vdpa/devices/"+vdpaId+"/virtio*/block/* is not found")
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}
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if (err == nil)
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{
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blockdev := "/dev/"+filepath.Base(matches[0])
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_, err = os.Stat(blockdev)
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if (err == nil)
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{
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// Generate state file
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stateJSON, _ := json.Marshal(&DeviceState{
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ConfigPath: ctxVars["configPath"],
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VdpaId: vdpaId,
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Image: volName,
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Blockdev: blockdev,
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Readonly: readonly,
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PidFile: pidFile,
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})
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err = os.WriteFile(stateFile, stateJSON, 0600)
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if (err == nil)
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{
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return blockdev, vdpaId, nil
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}
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}
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}
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}
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killErr := killByPidFile(pidFile)
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if (killErr != nil)
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{
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klog.Errorf("Failed to kill started qemu-storage-daemon: %v", killErr)
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}
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os.Remove(stateFile)
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os.Remove(pidFile)
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}
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return "", "", err
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}
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func (ns *NodeServer) unmapVduse(devicePath string)
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{
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if (len(devicePath) < 6 || devicePath[0:6] != "/dev/v")
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{
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klog.Errorf("%s does not start with /dev/v", devicePath)
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return
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}
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vduseDev, err := os.Readlink("/sys/block/"+devicePath[5:])
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if (err != nil)
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{
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klog.Errorf("%s is not a symbolic link to VDUSE device (../devices/virtual/vduse/xxx): %v", devicePath, err)
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return
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}
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vdpaId := ""
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p := strings.Index(vduseDev, "/vduse/")
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if (p >= 0)
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{
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vduseDev = vduseDev[p+7:]
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p = strings.Index(vduseDev, "/")
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if (p >= 0)
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{
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vdpaId = vduseDev[0:p]
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}
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}
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if (vdpaId == "")
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{
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klog.Errorf("%s is not a symbolic link to VDUSE device (../devices/virtual/vduse/xxx), but is %v", devicePath, vduseDev)
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return
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}
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ns.unmapVduseById(vdpaId)
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}
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func (ns *NodeServer) unmapVduseById(vdpaId string)
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{
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_, err := os.Stat("/sys/bus/vdpa/devices/"+vdpaId)
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if (err != nil)
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{
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klog.Errorf("failed to stat /sys/bus/vdpa/devices/"+vdpaId+": %v", err)
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}
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else
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{
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_, _, _ = system("/sbin/vdpa", "-j", "dev", "del", vdpaId)
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}
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stateFile := ns.stateDir + vdpaId + ".json"
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os.Remove(stateFile)
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pidFile := ns.stateDir + vdpaId + ".pid"
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_, err = os.Stat(pidFile)
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if (os.IsNotExist(err))
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{
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// ok, already killed
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}
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else if (err != nil)
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{
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klog.Errorf("Failed to stat %v: %v", pidFile, err)
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return
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}
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else
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{
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err = killByPidFile(pidFile)
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if (err != nil)
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{
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klog.Errorf("Failed to kill started qemu-storage-daemon: %v", err)
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}
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os.Remove(pidFile)
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}
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}
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func (ns *NodeServer) restarter()
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{
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// Restart dead VDUSE daemons at regular intervals
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// Otherwise volume I/O may hang in case of a qemu-storage-daemon crash
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// Moreover, it may lead to a kernel panic of the kernel is configured to
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// panic on hung tasks
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ticker := time.NewTicker(ns.restartInterval)
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defer ticker.Stop()
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for
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{
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<-ticker.C
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ns.restoreVduseDaemons()
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}
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}
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func (ns *NodeServer) restoreVduseDaemons()
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{
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pattern := ns.stateDir+"vitastor-vduse-*.json"
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matches, err := filepath.Glob(pattern)
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if (err != nil)
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{
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klog.Errorf("failed to list %s: %v", pattern, err)
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}
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if (len(matches) == 0)
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{
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return
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}
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devList := make(map[string]interface{})
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// example output: {"dev":{"test1":{"type":"block","mgmtdev":"vduse","vendor_id":0,"max_vqs":16,"max_vq_size":128}}}
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devListJSON, _, err := system("/sbin/vdpa", "-j", "dev", "list")
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if (err != nil)
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{
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return
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}
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err = json.Unmarshal(devListJSON, &devList)
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devs, ok := devList["dev"].(map[string]interface{})
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if (err != nil || !ok)
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{
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klog.Errorf("/sbin/vdpa -j dev list returned bad JSON (error %v): %v", err, string(devListJSON))
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return
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}
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for _, stateFile := range matches
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{
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vdpaId := filepath.Base(stateFile)
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vdpaId = vdpaId[0:len(vdpaId)-5]
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// Check if VDPA device is still added to the bus
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if (devs[vdpaId] != nil)
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{
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// Check if the storage daemon is still active
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pidFile := ns.stateDir + vdpaId + ".pid"
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exists := false
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proc, err := findByPidFile(pidFile)
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if (err == nil)
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{
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exists = proc.Signal(syscall.Signal(0)) == nil
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}
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if (!exists)
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{
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// Restart daemon
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stateJSON, err := os.ReadFile(stateFile)
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if (err != nil)
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{
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klog.Warningf("error reading state file %v: %v", stateFile, err)
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}
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else
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{
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var state DeviceState
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err := json.Unmarshal(stateJSON, &state)
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if (err != nil)
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{
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klog.Warningf("state file %v contains invalid JSON (error %v): %v", stateFile, err, string(stateJSON))
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}
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else
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{
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klog.Warningf("restarting storage daemon for volume %v (VDPA ID %v)", state.Image, vdpaId)
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_ = startStorageDaemon(vdpaId, state.Image, pidFile, state.ConfigPath, state.Readonly)
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}
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}
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}
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}
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else
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{
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// Unused, clean it up
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ns.unmapVduseById(vdpaId)
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}
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}
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}
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// NodePublishVolume mounts the volume mounted to the staging path to the target path
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func (ns *NodeServer) NodePublishVolume(ctx context.Context, req *csi.NodePublishVolumeRequest) (*csi.NodePublishVolumeResponse, error)
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{
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klog.Infof("received node publish volume request %+v", protosanitizer.StripSecrets(req))
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targetPath := req.GetTargetPath()
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isBlock := req.GetVolumeCapability().GetBlock() != nil
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// Check that it's not already mounted
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_, err := mount.IsNotMountPoint(ns.mounter, targetPath)
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if (err != nil)
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{
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if (os.IsNotExist(err))
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{
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if (isBlock)
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{
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pathFile, err := os.OpenFile(targetPath, os.O_CREATE|os.O_RDWR, 0o600)
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if (err != nil)
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{
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klog.Errorf("failed to create block device mount target %s with error: %v", targetPath, err)
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return nil, err
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}
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err = pathFile.Close()
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if (err != nil)
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{
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klog.Errorf("failed to close %s with error: %v", targetPath, err)
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return nil, err
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}
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}
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else
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{
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err := os.MkdirAll(targetPath, 0777)
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if (err != nil)
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{
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klog.Errorf("failed to create fs mount target %s with error: %v", targetPath, err)
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return nil, err
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}
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}
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}
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else
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{
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return nil, err
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}
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}
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ctxVars := make(map[string]string)
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err = json.Unmarshal([]byte(req.VolumeId), &ctxVars)
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if (err != nil)
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{
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return nil, status.Error(codes.Internal, "volume ID not in JSON format")
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}
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volName := ctxVars["name"]
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_, err = GetConnectionParams(ctxVars)
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if (err != nil)
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{
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return nil, err
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}
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var devicePath, vdpaId string
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if (!ns.useVduse)
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{
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devicePath, err = ns.mapNbd(volName, ctxVars, req.GetReadonly())
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}
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else
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{
|
|
devicePath, vdpaId, err = ns.mapVduse(volName, ctxVars, req.GetReadonly())
|
|
}
|
|
if (err != nil)
|
|
{
|
|
return nil, err
|
|
}
|
|
|
|
diskMounter := &mount.SafeFormatAndMount{Interface: ns.mounter, Exec: utilexec.New()}
|
|
if (isBlock)
|
|
{
|
|
err = diskMounter.Mount(devicePath, targetPath, "", []string{"bind"})
|
|
}
|
|
else
|
|
{
|
|
// Check existing format
|
|
existingFormat, err := diskMounter.GetDiskFormat(devicePath)
|
|
if (err != nil)
|
|
{
|
|
klog.Errorf("failed to get disk format for path %s, error: %v", err)
|
|
goto unmap
|
|
}
|
|
|
|
// Format the device (ext4 or xfs)
|
|
fsType := req.GetVolumeCapability().GetMount().GetFsType()
|
|
opt := req.GetVolumeCapability().GetMount().GetMountFlags()
|
|
opt = append(opt, "_netdev")
|
|
if ((req.VolumeCapability.AccessMode.Mode == csi.VolumeCapability_AccessMode_MULTI_NODE_READER_ONLY ||
|
|
req.VolumeCapability.AccessMode.Mode == csi.VolumeCapability_AccessMode_SINGLE_NODE_READER_ONLY) &&
|
|
!Contains(opt, "ro"))
|
|
{
|
|
opt = append(opt, "ro")
|
|
}
|
|
if (fsType == "xfs")
|
|
{
|
|
opt = append(opt, "nouuid")
|
|
}
|
|
readOnly := Contains(opt, "ro")
|
|
if (existingFormat == "" && !readOnly)
|
|
{
|
|
var cmdOut []byte
|
|
switch fsType
|
|
{
|
|
case "ext4":
|
|
args := []string{"-m0", "-Enodiscard,lazy_itable_init=1,lazy_journal_init=1", devicePath}
|
|
cmdOut, err = diskMounter.Exec.Command("mkfs.ext4", args...).CombinedOutput()
|
|
case "xfs":
|
|
cmdOut, err = diskMounter.Exec.Command("mkfs.xfs", "-K", devicePath).CombinedOutput()
|
|
}
|
|
if (err != nil)
|
|
{
|
|
klog.Errorf("failed to run mkfs error: %v, output: %v", err, string(cmdOut))
|
|
goto unmap
|
|
}
|
|
}
|
|
|
|
err = diskMounter.FormatAndMount(devicePath, targetPath, fsType, opt)
|
|
|
|
// Try to run online resize on mount.
|
|
// FIXME: Implement online resize. It requires online resize support in vitastor-nbd.
|
|
if (err == nil && existingFormat != "" && !readOnly)
|
|
{
|
|
var cmdOut []byte
|
|
switch (fsType)
|
|
{
|
|
case "ext4":
|
|
cmdOut, err = diskMounter.Exec.Command("resize2fs", devicePath).CombinedOutput()
|
|
case "xfs":
|
|
cmdOut, err = diskMounter.Exec.Command("xfs_growfs", devicePath).CombinedOutput()
|
|
}
|
|
if (err != nil)
|
|
{
|
|
klog.Errorf("failed to run resizefs error: %v, output: %v", err, string(cmdOut))
|
|
goto unmap
|
|
}
|
|
}
|
|
}
|
|
if (err != nil)
|
|
{
|
|
klog.Errorf(
|
|
"failed to mount device path (%s) to path (%s) for volume (%s) error: %s",
|
|
devicePath, targetPath, volName, err,
|
|
)
|
|
goto unmap
|
|
}
|
|
return &csi.NodePublishVolumeResponse{}, nil
|
|
|
|
unmap:
|
|
if (!ns.useVduse || len(devicePath) >= 8 && devicePath[0:8] == "/dev/nbd")
|
|
{
|
|
ns.unmapNbd(devicePath)
|
|
}
|
|
else
|
|
{
|
|
ns.unmapVduseById(vdpaId)
|
|
}
|
|
return nil, err
|
|
}
|
|
|
|
// NodeUnpublishVolume unmounts the volume from the target path
|
|
func (ns *NodeServer) NodeUnpublishVolume(ctx context.Context, req *csi.NodeUnpublishVolumeRequest) (*csi.NodeUnpublishVolumeResponse, error)
|
|
{
|
|
klog.Infof("received node unpublish volume request %+v", protosanitizer.StripSecrets(req))
|
|
targetPath := req.GetTargetPath()
|
|
devicePath, refCount, err := mount.GetDeviceNameFromMount(ns.mounter, targetPath)
|
|
if (err != nil)
|
|
{
|
|
if (os.IsNotExist(err))
|
|
{
|
|
return nil, status.Error(codes.NotFound, "Target path not found")
|
|
}
|
|
return nil, err
|
|
}
|
|
if (devicePath == "")
|
|
{
|
|
// volume not mounted
|
|
klog.Warningf("%s is not a mountpoint, deleting", targetPath)
|
|
os.Remove(targetPath)
|
|
return &csi.NodeUnpublishVolumeResponse{}, nil
|
|
}
|
|
// unmount
|
|
err = mount.CleanupMountPoint(targetPath, ns.mounter, false)
|
|
if (err != nil)
|
|
{
|
|
return nil, err
|
|
}
|
|
// unmap NBD device
|
|
if (refCount == 1)
|
|
{
|
|
if (!ns.useVduse)
|
|
{
|
|
ns.unmapNbd(devicePath)
|
|
}
|
|
else
|
|
{
|
|
ns.unmapVduse(devicePath)
|
|
}
|
|
}
|
|
return &csi.NodeUnpublishVolumeResponse{}, nil
|
|
}
|
|
|
|
// NodeGetVolumeStats returns volume capacity statistics available for the volume
|
|
func (ns *NodeServer) NodeGetVolumeStats(ctx context.Context, req *csi.NodeGetVolumeStatsRequest) (*csi.NodeGetVolumeStatsResponse, error)
|
|
{
|
|
return nil, status.Error(codes.Unimplemented, "")
|
|
}
|
|
|
|
// NodeExpandVolume expanding the file system on the node
|
|
func (ns *NodeServer) NodeExpandVolume(ctx context.Context, req *csi.NodeExpandVolumeRequest) (*csi.NodeExpandVolumeResponse, error)
|
|
{
|
|
return nil, status.Error(codes.Unimplemented, "")
|
|
}
|
|
|
|
// NodeGetCapabilities returns the supported capabilities of the node server
|
|
func (ns *NodeServer) NodeGetCapabilities(ctx context.Context, req *csi.NodeGetCapabilitiesRequest) (*csi.NodeGetCapabilitiesResponse, error)
|
|
{
|
|
return &csi.NodeGetCapabilitiesResponse{}, nil
|
|
}
|
|
|
|
// NodeGetInfo returns NodeGetInfoResponse for CO.
|
|
func (ns *NodeServer) NodeGetInfo(ctx context.Context, req *csi.NodeGetInfoRequest) (*csi.NodeGetInfoResponse, error)
|
|
{
|
|
klog.Infof("received node get info request %+v", protosanitizer.StripSecrets(req))
|
|
return &csi.NodeGetInfoResponse{
|
|
NodeId: ns.NodeID,
|
|
}, nil
|
|
}
|