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moby--moby/graphdriver/devmapper/devmapper.go

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// +build linux,amd64
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package devmapper
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import (
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"errors"
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"fmt"
"github.com/dotcloud/docker/utils"
"runtime"
"syscall"
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)
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type DevmapperLogger interface {
log(level int, file string, line int, dmError int, message string)
}
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const (
DeviceCreate TaskType = iota
DeviceReload
DeviceRemove
DeviceRemoveAll
DeviceSuspend
DeviceResume
DeviceInfo
DeviceDeps
DeviceRename
DeviceVersion
DeviceStatus
DeviceTable
DeviceWaitevent
DeviceList
DeviceClear
DeviceMknodes
DeviceListVersions
DeviceTargetMsg
DeviceSetGeometry
)
const (
AddNodeOnResume AddNodeType = iota
AddNodeOnCreate
)
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var (
ErrTaskRun = errors.New("dm_task_run failed")
ErrTaskSetName = errors.New("dm_task_set_name failed")
ErrTaskSetMessage = errors.New("dm_task_set_message failed")
ErrTaskSetAddNode = errors.New("dm_task_set_add_node failed")
ErrTaskSetRo = errors.New("dm_task_set_ro failed")
ErrTaskAddTarget = errors.New("dm_task_add_target failed")
ErrTaskSetSector = errors.New("dm_task_set_sector failed")
ErrTaskGetInfo = errors.New("dm_task_get_info failed")
ErrTaskSetCookie = errors.New("dm_task_set_cookie failed")
ErrNilCookie = errors.New("cookie ptr can't be nil")
ErrAttachLoopbackDevice = errors.New("loopback mounting failed")
ErrGetBlockSize = errors.New("Can't get block size")
ErrUdevWait = errors.New("wait on udev cookie failed")
ErrSetDevDir = errors.New("dm_set_dev_dir failed")
ErrGetLibraryVersion = errors.New("dm_get_library_version failed")
ErrCreateRemoveTask = errors.New("Can't create task of type DeviceRemove")
ErrRunRemoveDevice = errors.New("running removeDevice failed")
ErrInvalidAddNode = errors.New("Invalide AddNoce type")
ErrGetLoopbackBackingFile = errors.New("Unable to get loopback backing file")
ErrLoopbackSetCapacity = errors.New("Unable set loopback capacity")
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)
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type (
Task struct {
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unmanaged *CDmTask
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}
Info struct {
Exists int
Suspended int
LiveTable int
InactiveTable int
OpenCount int32
EventNr uint32
Major uint32
Minor uint32
ReadOnly int
TargetCount int32
}
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TaskType int
AddNodeType int
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)
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func (t *Task) destroy() {
if t != nil {
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DmTaskDestroy(t.unmanaged)
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runtime.SetFinalizer(t, nil)
}
}
func TaskCreate(tasktype TaskType) *Task {
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Ctask := DmTaskCreate(int(tasktype))
if Ctask == nil {
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return nil
}
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task := &Task{unmanaged: Ctask}
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runtime.SetFinalizer(task, (*Task).destroy)
return task
}
func (t *Task) Run() error {
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if res := DmTaskRun(t.unmanaged); res != 1 {
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return ErrTaskRun
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}
return nil
}
func (t *Task) SetName(name string) error {
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if res := DmTaskSetName(t.unmanaged, name); res != 1 {
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return ErrTaskSetName
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}
return nil
}
func (t *Task) SetMessage(message string) error {
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if res := DmTaskSetMessage(t.unmanaged, message); res != 1 {
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return ErrTaskSetMessage
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}
return nil
}
func (t *Task) SetSector(sector uint64) error {
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if res := DmTaskSetSector(t.unmanaged, sector); res != 1 {
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return ErrTaskSetSector
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}
return nil
}
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func (t *Task) SetCookie(cookie *uint, flags uint16) error {
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if cookie == nil {
return ErrNilCookie
}
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if res := DmTaskSetCookie(t.unmanaged, cookie, flags); res != 1 {
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return ErrTaskSetCookie
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}
return nil
}
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func (t *Task) SetAddNode(addNode AddNodeType) error {
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if addNode != AddNodeOnResume && addNode != AddNodeOnCreate {
return ErrInvalidAddNode
}
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if res := DmTaskSetAddNode(t.unmanaged, addNode); res != 1 {
return ErrTaskSetAddNode
}
return nil
}
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func (t *Task) SetRo() error {
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if res := DmTaskSetRo(t.unmanaged); res != 1 {
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return ErrTaskSetRo
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}
return nil
}
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func (t *Task) AddTarget(start, size uint64, ttype, params string) error {
if res := DmTaskAddTarget(t.unmanaged, start, size,
ttype, params); res != 1 {
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return ErrTaskAddTarget
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}
return nil
}
func (t *Task) GetInfo() (*Info, error) {
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info := &Info{}
if res := DmTaskGetInfo(t.unmanaged, info); res != 1 {
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return nil, ErrTaskGetInfo
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}
return info, nil
}
func (t *Task) GetNextTarget(next uintptr) (nextPtr uintptr, start uint64,
length uint64, targetType string, params string) {
return DmGetNextTarget(t.unmanaged, next, &start, &length,
&targetType, &params),
start, length, targetType, params
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}
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func getLoopbackBackingFile(file *osFile) (uint64, uint64, error) {
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loopInfo, err := ioctlLoopGetStatus64(file.Fd())
if err != nil {
utils.Errorf("Error get loopback backing file: %s\n", err)
return 0, 0, ErrGetLoopbackBackingFile
}
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return loopInfo.loDevice, loopInfo.loInode, nil
}
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func LoopbackSetCapacity(file *osFile) error {
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if err := ioctlLoopSetCapacity(file.Fd(), 0); err != nil {
utils.Errorf("Error loopbackSetCapacity: %s", err)
return ErrLoopbackSetCapacity
}
return nil
}
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func FindLoopDeviceFor(file *osFile) *osFile {
stat, err := file.Stat()
if err != nil {
return nil
}
targetInode := stat.Sys().(*sysStatT).Ino
targetDevice := stat.Sys().(*sysStatT).Dev
for i := 0; true; i++ {
path := fmt.Sprintf("/dev/loop%d", i)
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file, err := osOpenFile(path, osORdWr, 0)
if err != nil {
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if osIsNotExist(err) {
return nil
}
// Ignore all errors until the first not-exist
// we want to continue looking for the file
continue
}
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dev, inode, err := getLoopbackBackingFile(file)
if err == nil && dev == targetDevice && inode == targetInode {
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return file
}
file.Close()
}
return nil
}
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func UdevWait(cookie uint) error {
if res := DmUdevWait(cookie); res != 1 {
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utils.Debugf("Failed to wait on udev cookie %d", cookie)
return ErrUdevWait
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}
return nil
}
func LogInitVerbose(level int) {
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DmLogInitVerbose(level)
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}
var dmLogger DevmapperLogger = nil
func logInit(logger DevmapperLogger) {
dmLogger = logger
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LogWithErrnoInit()
}
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func SetDevDir(dir string) error {
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if res := DmSetDevDir(dir); res != 1 {
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utils.Debugf("Error dm_set_dev_dir")
return ErrSetDevDir
}
return nil
}
func GetLibraryVersion() (string, error) {
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var version string
if res := DmGetLibraryVersion(&version); res != 1 {
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return "", ErrGetLibraryVersion
}
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return version, nil
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}
// Useful helper for cleanup
func RemoveDevice(name string) error {
task := TaskCreate(DeviceRemove)
if task == nil {
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return ErrCreateRemoveTask
}
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if err := task.SetName(name); err != nil {
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utils.Debugf("Can't set task name %s", name)
return err
}
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if err := task.Run(); err != nil {
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return ErrRunRemoveDevice
}
return nil
}
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func GetBlockDeviceSize(file *osFile) (uint64, error) {
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size, err := ioctlBlkGetSize64(file.Fd())
if err != nil {
utils.Errorf("Error getblockdevicesize: %s", err)
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return 0, ErrGetBlockSize
}
return uint64(size), nil
}
func BlockDeviceDiscard(path string) error {
file, err := osOpenFile(path, osORdWr, 0)
if err != nil {
return err
}
defer file.Close()
size, err := GetBlockDeviceSize(file)
if err != nil {
return err
}
if err := ioctlBlkDiscard(file.Fd(), 0, size); err != nil {
return err
}
// Without this sometimes the remove of the device that happens after
// discard fails with EBUSY.
syscall.Sync()
return nil
}
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// This is the programmatic example of "dmsetup create"
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func createPool(poolName string, dataFile, metadataFile *osFile) error {
task, err := createTask(DeviceCreate, poolName)
if task == nil {
return err
}
size, err := GetBlockDeviceSize(dataFile)
if err != nil {
return fmt.Errorf("Can't get data size")
}
params := metadataFile.Name() + " " + dataFile.Name() + " 128 32768 1 skip_block_zeroing"
if err := task.AddTarget(0, size/512, "thin-pool", params); err != nil {
return fmt.Errorf("Can't add target")
}
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var cookie uint = 0
if err := task.SetCookie(&cookie, 0); err != nil {
return fmt.Errorf("Can't set cookie")
}
if err := task.Run(); err != nil {
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return fmt.Errorf("Error running DeviceCreate (createPool)")
}
UdevWait(cookie)
return nil
}
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func reloadPool(poolName string, dataFile, metadataFile *osFile) error {
task, err := createTask(DeviceReload, poolName)
if task == nil {
return err
}
size, err := GetBlockDeviceSize(dataFile)
if err != nil {
return fmt.Errorf("Can't get data size")
}
params := metadataFile.Name() + " " + dataFile.Name() + " 128 32768"
if err := task.AddTarget(0, size/512, "thin-pool", params); err != nil {
return fmt.Errorf("Can't add target")
}
if err := task.Run(); err != nil {
return fmt.Errorf("Error running DeviceCreate")
}
return nil
}
func createTask(t TaskType, name string) (*Task, error) {
task := TaskCreate(t)
if task == nil {
return nil, fmt.Errorf("Can't create task of type %d", int(t))
}
if err := task.SetName(name); err != nil {
return nil, fmt.Errorf("Can't set task name %s", name)
}
return task, nil
}
func getInfo(name string) (*Info, error) {
task, err := createTask(DeviceInfo, name)
if task == nil {
return nil, err
}
if err := task.Run(); err != nil {
return nil, err
}
return task.GetInfo()
}
func getStatus(name string) (uint64, uint64, string, string, error) {
task, err := createTask(DeviceStatus, name)
if task == nil {
utils.Debugf("getStatus: Error createTask: %s", err)
return 0, 0, "", "", err
}
if err := task.Run(); err != nil {
utils.Debugf("getStatus: Error Run: %s", err)
return 0, 0, "", "", err
}
devinfo, err := task.GetInfo()
if err != nil {
utils.Debugf("getStatus: Error GetInfo: %s", err)
return 0, 0, "", "", err
}
if devinfo.Exists == 0 {
utils.Debugf("getStatus: Non existing device %s", name)
return 0, 0, "", "", fmt.Errorf("Non existing device %s", name)
}
_, start, length, targetType, params := task.GetNextTarget(0)
return start, length, targetType, params, nil
}
func setTransactionId(poolName string, oldId uint64, newId uint64) error {
task, err := createTask(DeviceTargetMsg, poolName)
if task == nil {
return err
}
if err := task.SetSector(0); err != nil {
return fmt.Errorf("Can't set sector")
}
if err := task.SetMessage(fmt.Sprintf("set_transaction_id %d %d", oldId, newId)); err != nil {
return fmt.Errorf("Can't set message")
}
if err := task.Run(); err != nil {
return fmt.Errorf("Error running setTransactionId")
}
return nil
}
func suspendDevice(name string) error {
task, err := createTask(DeviceSuspend, name)
if task == nil {
return err
}
if err := task.Run(); err != nil {
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return fmt.Errorf("Error running DeviceSuspend: %s", err)
}
return nil
}
func resumeDevice(name string) error {
task, err := createTask(DeviceResume, name)
if task == nil {
return err
}
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var cookie uint = 0
if err := task.SetCookie(&cookie, 0); err != nil {
return fmt.Errorf("Can't set cookie")
}
if err := task.Run(); err != nil {
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return fmt.Errorf("Error running DeviceResume")
}
UdevWait(cookie)
return nil
}
func createDevice(poolName string, deviceId int) error {
utils.Debugf("[devmapper] createDevice(poolName=%v, deviceId=%v)", poolName, deviceId)
task, err := createTask(DeviceTargetMsg, poolName)
if task == nil {
return err
}
if err := task.SetSector(0); err != nil {
return fmt.Errorf("Can't set sector")
}
if err := task.SetMessage(fmt.Sprintf("create_thin %d", deviceId)); err != nil {
return fmt.Errorf("Can't set message")
}
if err := task.Run(); err != nil {
return fmt.Errorf("Error running createDevice")
}
return nil
}
func deleteDevice(poolName string, deviceId int) error {
task, err := createTask(DeviceTargetMsg, poolName)
if task == nil {
return err
}
if err := task.SetSector(0); err != nil {
return fmt.Errorf("Can't set sector")
}
if err := task.SetMessage(fmt.Sprintf("delete %d", deviceId)); err != nil {
return fmt.Errorf("Can't set message")
}
if err := task.Run(); err != nil {
return fmt.Errorf("Error running deleteDevice")
}
return nil
}
func removeDevice(name string) error {
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utils.Debugf("[devmapper] removeDevice START")
defer utils.Debugf("[devmapper] removeDevice END")
task, err := createTask(DeviceRemove, name)
if task == nil {
return err
}
if err = task.Run(); err != nil {
return fmt.Errorf("Error running removeDevice")
}
return nil
}
func activateDevice(poolName string, name string, deviceId int, size uint64) error {
task, err := createTask(DeviceCreate, name)
if task == nil {
return err
}
params := fmt.Sprintf("%s %d", poolName, deviceId)
if err := task.AddTarget(0, size/512, "thin", params); err != nil {
return fmt.Errorf("Can't add target")
}
if err := task.SetAddNode(AddNodeOnCreate); err != nil {
return fmt.Errorf("Can't add node")
}
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var cookie uint = 0
if err := task.SetCookie(&cookie, 0); err != nil {
return fmt.Errorf("Can't set cookie")
}
if err := task.Run(); err != nil {
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return fmt.Errorf("Error running DeviceCreate (activateDevice)")
}
UdevWait(cookie)
return nil
}
func (devices *DeviceSet) createSnapDevice(poolName string, deviceId int, baseName string, baseDeviceId int) error {
devinfo, _ := getInfo(baseName)
doSuspend := devinfo != nil && devinfo.Exists != 0
if doSuspend {
if err := suspendDevice(baseName); err != nil {
return err
}
}
task, err := createTask(DeviceTargetMsg, poolName)
if task == nil {
if doSuspend {
resumeDevice(baseName)
}
return err
}
if err := task.SetSector(0); err != nil {
if doSuspend {
resumeDevice(baseName)
}
return fmt.Errorf("Can't set sector")
}
if err := task.SetMessage(fmt.Sprintf("create_snap %d %d", deviceId, baseDeviceId)); err != nil {
if doSuspend {
resumeDevice(baseName)
}
return fmt.Errorf("Can't set message")
}
if err := task.Run(); err != nil {
if doSuspend {
resumeDevice(baseName)
}
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return fmt.Errorf("Error running DeviceCreate (createSnapDevice)")
}
if doSuspend {
if err := resumeDevice(baseName); err != nil {
return err
}
}
return nil
}