Move NDB/VDUSE map/unmap functions to a separate file
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// 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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"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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"k8s.io/klog"
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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 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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func 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 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 mapVduse(stateDir string, 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(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 := 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 unmapVduse(stateDir, 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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unmapVduseById(stateDir, vdpaId)
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}
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func unmapVduseById(stateDir, 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 := stateDir + vdpaId + ".json"
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os.Remove(stateFile)
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pidFile := 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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