595 lines
18 KiB
Go
595 lines
18 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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"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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"strings"
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"sync"
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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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mu sync.Mutex
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cond *sync.Cond
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volumeLocks map[string]bool
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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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volumeLocks: make(map[string]bool),
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}
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ns.cond = sync.NewCond(&ns.mu)
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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 (ns *NodeServer) lockVolume(lockId string)
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{
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ns.mu.Lock()
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defer ns.mu.Unlock()
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for (ns.volumeLocks[lockId])
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{
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ns.cond.Wait()
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}
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ns.volumeLocks[lockId] = true
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ns.cond.Broadcast()
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}
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func (ns *NodeServer) unlockVolume(lockId string)
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{
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ns.mu.Lock()
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defer ns.mu.Unlock()
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delete(ns.volumeLocks, lockId)
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ns.cond.Broadcast()
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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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// Unused, clean it up
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unmapVduseById(ns.stateDir, vdpaId)
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continue
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}
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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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continue
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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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continue
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}
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ns.lockVolume(state.ConfigPath+":"+state.Image)
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// Recheck state file after locking
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_, err = os.ReadFile(stateFile)
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if (err != nil)
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{
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klog.Warningf("state file %v disappeared, skipping volume", stateFile)
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ns.unlockVolume(state.ConfigPath+":"+state.Image)
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continue
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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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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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ns.unlockVolume(state.ConfigPath+":"+state.Image)
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}
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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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klog.Infof("received node stage volume request %+v", protosanitizer.StripSecrets(req))
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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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_, 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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volName := ctxVars["name"]
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ns.lockVolume(ctxVars["configPath"]+":"+volName)
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defer ns.unlockVolume(ctxVars["configPath"]+":"+volName)
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targetPath := req.GetStagingTargetPath()
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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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var devicePath, vdpaId string
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if (!ns.useVduse)
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{
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devicePath, err = mapNbd(volName, ctxVars, false)
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}
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else
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{
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devicePath, vdpaId, err = mapVduse(ns.stateDir, volName, ctxVars, false)
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}
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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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diskMounter := &mount.SafeFormatAndMount{Interface: ns.mounter, Exec: utilexec.New()}
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if (isBlock)
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{
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err = diskMounter.Mount(devicePath, targetPath, "", []string{"bind"})
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}
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else
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{
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// Check existing format
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existingFormat, err := diskMounter.GetDiskFormat(devicePath)
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if (err != nil)
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{
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klog.Errorf("failed to get disk format for path %s, error: %v", err)
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goto unmap
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}
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// Format the device (ext4 or xfs)
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fsType := req.GetVolumeCapability().GetMount().GetFsType()
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opt := req.GetVolumeCapability().GetMount().GetMountFlags()
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opt = append(opt, "_netdev")
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if ((req.VolumeCapability.AccessMode.Mode == csi.VolumeCapability_AccessMode_MULTI_NODE_READER_ONLY ||
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req.VolumeCapability.AccessMode.Mode == csi.VolumeCapability_AccessMode_SINGLE_NODE_READER_ONLY) &&
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!Contains(opt, "ro"))
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{
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opt = append(opt, "ro")
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}
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if (fsType == "xfs")
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{
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opt = append(opt, "nouuid")
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}
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readOnly := Contains(opt, "ro")
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if (existingFormat == "" && !readOnly)
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{
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var cmdOut []byte
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switch fsType
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{
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case "ext4":
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args := []string{"-m0", "-Enodiscard,lazy_itable_init=1,lazy_journal_init=1", devicePath}
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cmdOut, err = diskMounter.Exec.Command("mkfs.ext4", args...).CombinedOutput()
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case "xfs":
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cmdOut, err = diskMounter.Exec.Command("mkfs.xfs", "-K", devicePath).CombinedOutput()
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}
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if (err != nil)
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{
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klog.Errorf("failed to run mkfs error: %v, output: %v", err, string(cmdOut))
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goto unmap
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}
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}
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err = diskMounter.FormatAndMount(devicePath, targetPath, fsType, opt)
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// Try to run online resize on mount.
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// FIXME: Implement online resize. It requires online resize support in vitastor-nbd.
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if (err == nil && existingFormat != "" && !readOnly)
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{
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var cmdOut []byte
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switch (fsType)
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{
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case "ext4":
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cmdOut, err = diskMounter.Exec.Command("resize2fs", devicePath).CombinedOutput()
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case "xfs":
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cmdOut, err = diskMounter.Exec.Command("xfs_growfs", devicePath).CombinedOutput()
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}
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if (err != nil)
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{
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klog.Errorf("failed to run resizefs error: %v, output: %v", err, string(cmdOut))
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goto unmap
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}
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}
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}
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if (err != nil)
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{
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klog.Errorf(
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"failed to mount device path (%s) to path (%s) for volume (%s) error: %s",
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devicePath, targetPath, volName, err,
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)
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goto unmap
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}
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return &csi.NodeStageVolumeResponse{}, nil
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unmap:
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if (!ns.useVduse || len(devicePath) >= 8 && devicePath[0:8] == "/dev/nbd")
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{
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unmapNbd(devicePath)
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}
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else
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{
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unmapVduseById(ns.stateDir, vdpaId)
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}
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return nil, err
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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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klog.Infof("received node unstage volume request %+v", protosanitizer.StripSecrets(req))
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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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ns.lockVolume(ctxVars["configPath"]+":"+volName)
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defer ns.unlockVolume(ctxVars["configPath"]+":"+volName)
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targetPath := req.GetStagingTargetPath()
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devicePath, refCount, err := mount.GetDeviceNameFromMount(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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return nil, status.Error(codes.NotFound, "Target path not found")
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}
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return nil, err
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}
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if (devicePath == "")
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{
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// volume not mounted
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klog.Warningf("%s is not a mountpoint, deleting", targetPath)
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os.Remove(targetPath)
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return &csi.NodeUnstageVolumeResponse{}, nil
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}
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// unmount
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err = mount.CleanupMountPoint(targetPath, ns.mounter, false)
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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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// unmap device
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if (refCount == 1)
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{
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if (!ns.useVduse)
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{
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unmapNbd(devicePath)
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}
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else
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{
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unmapVduse(ns.stateDir, devicePath)
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}
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}
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return &csi.NodeUnstageVolumeResponse{}, nil
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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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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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_, 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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volName := ctxVars["name"]
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ns.lockVolume(ctxVars["configPath"]+":"+volName)
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defer ns.unlockVolume(ctxVars["configPath"]+":"+volName)
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stagingTargetPath := req.GetStagingTargetPath()
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targetPath := req.GetTargetPath()
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isBlock := req.GetVolumeCapability().GetBlock() != nil
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// Check that stagingTargetPath is mounted
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_, err = mount.IsNotMountPoint(ns.mounter, stagingTargetPath)
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if (err != nil)
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{
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klog.Errorf("staging path %v is not mounted: %v", stagingTargetPath, err)
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return nil, fmt.Errorf("staging path %v is not mounted: %v", stagingTargetPath, err)
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}
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// Check that targetPath is 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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execArgs := []string{"--bind", stagingTargetPath, targetPath}
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if (req.GetReadonly())
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{
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execArgs = append(execArgs, "-o", "ro")
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}
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cmd := exec.Command("mount", execArgs...)
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cmd.Stderr = os.Stderr
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klog.Infof("binding volume %v (%v) from %v to %v", volName, ctxVars["configPath"], stagingTargetPath, targetPath)
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out, err := cmd.Output()
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if (err != nil)
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{
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return nil, fmt.Errorf("Error running mount %v: %s", strings.Join(execArgs, " "), out)
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}
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return &csi.NodePublishVolumeResponse{}, nil
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}
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// NodeUnpublishVolume unmounts the volume from the target path
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func (ns *NodeServer) NodeUnpublishVolume(ctx context.Context, req *csi.NodeUnpublishVolumeRequest) (*csi.NodeUnpublishVolumeResponse, error)
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{
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klog.Infof("received node unpublish volume request %+v", protosanitizer.StripSecrets(req))
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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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ns.lockVolume(ctxVars["configPath"]+":"+volName)
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defer ns.unlockVolume(ctxVars["configPath"]+":"+volName)
|
|
|
|
targetPath := req.GetTargetPath()
|
|
devicePath, _, 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
|
|
}
|
|
|
|
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{
|
|
Capabilities: []*csi.NodeServiceCapability{
|
|
&csi.NodeServiceCapability{
|
|
Type: &csi.NodeServiceCapability_Rpc{
|
|
Rpc: &csi.NodeServiceCapability_RPC{
|
|
Type: csi.NodeServiceCapability_RPC_STAGE_UNSTAGE_VOLUME,
|
|
},
|
|
},
|
|
},
|
|
},
|
|
}, 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
|
|
}
|