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Merge pull request #5404 from alexlarsson/dm-new-metadata

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Make devicemapper backend able to support multiple processes
Upstream-commit: 3a1703a79f6702c67ce51ea58f359d1d63bb0c6f
Component: engine
This commit is contained in:
Alexander Larsson
2014-05-08 14:31:17 +02:00
parent a4a413f833 5874977460
commit 63b4ebccb3
4 changed files with 198 additions and 142 deletions
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220
components/engine/daemon/graphdriver/devmapper/deviceset.go
View File

@ -11,7 +11,6 @@ import (
"path"
"path/filepath"
"strconv"
"strings"
"sync"
"syscall"
"time"
@ -62,8 +61,7 @@ type DeviceSet struct {
devicePrefix string
TransactionId uint64
NewTransactionId uint64
nextFreeDevice int
sawBusy bool
nextDeviceId int
}
type DiskUsage struct {
@ -109,7 +107,19 @@ func (devices *DeviceSet) loopbackDir() string {
return path.Join(devices.root, "devicemapper")
}
func (devices *DeviceSet) jsonFile() string {
func (devices *DeviceSet) metadataDir() string {
return path.Join(devices.root, "metadata")
}
func (devices *DeviceSet) metadataFile(info *DevInfo) string {
file := info.Hash
if file == "" {
file = "base"
}
return path.Join(devices.metadataDir(), file)
}
func (devices *DeviceSet) oldMetadataFile() string {
return path.Join(devices.loopbackDir(), "json")
}
@ -159,26 +169,24 @@ func (devices *DeviceSet) ensureImage(name string, size int64) (string, error) {
return filename, nil
}
func (devices *DeviceSet) allocateDeviceId() int {
// TODO: Add smarter reuse of deleted devices
id := devices.nextFreeDevice
devices.nextFreeDevice = devices.nextFreeDevice + 1
return id
}
func (devices *DeviceSet) allocateTransactionId() uint64 {
devices.NewTransactionId = devices.NewTransactionId + 1
return devices.NewTransactionId
}
func (devices *DeviceSet) saveMetadata() error {
devices.devicesLock.Lock()
jsonData, err := json.Marshal(devices.MetaData)
devices.devicesLock.Unlock()
func (devices *DeviceSet) removeMetadata(info *DevInfo) error {
if err := osRemoveAll(devices.metadataFile(info)); err != nil {
return fmt.Errorf("Error removing metadata file %s: %s", devices.metadataFile(info), err)
}
return nil
}
func (devices *DeviceSet) saveMetadata(info *DevInfo) error {
jsonData, err := json.Marshal(info)
if err != nil {
return fmt.Errorf("Error encoding metadata to json: %s", err)
}
tmpFile, err := ioutil.TempFile(filepath.Dir(devices.jsonFile()), ".json")
tmpFile, err := ioutil.TempFile(devices.metadataDir(), ".tmp")
if err != nil {
return fmt.Errorf("Error creating metadata file: %s", err)
}
@ -196,7 +204,7 @@ func (devices *DeviceSet) saveMetadata() error {
if err := tmpFile.Close(); err != nil {
return fmt.Errorf("Error closing metadata file %s: %s", tmpFile.Name(), err)
}
if err := osRename(tmpFile.Name(), devices.jsonFile()); err != nil {
if err := osRename(tmpFile.Name(), devices.metadataFile(info)); err != nil {
return fmt.Errorf("Error committing metadata file %s: %s", tmpFile.Name(), err)
}
@ -214,7 +222,12 @@ func (devices *DeviceSet) lookupDevice(hash string) (*DevInfo, error) {
defer devices.devicesLock.Unlock()
info := devices.Devices[hash]
if info == nil {
return nil, fmt.Errorf("Unknown device %s", hash)
info = devices.loadMetadata(hash)
if info == nil {
return nil, fmt.Errorf("Unknown device %s", hash)
}
devices.Devices[hash] = info
}
return info, nil
}
@ -234,7 +247,7 @@ func (devices *DeviceSet) registerDevice(id int, hash string, size uint64) (*Dev
devices.Devices[hash] = info
devices.devicesLock.Unlock()
if err := devices.saveMetadata(); err != nil {
if err := devices.saveMetadata(info); err != nil {
// Try to remove unused device
devices.devicesLock.Lock()
delete(devices.Devices, hash)
@ -269,9 +282,7 @@ func (devices *DeviceSet) createFilesystem(info *DevInfo) error {
return nil
}
func (devices *DeviceSet) loadMetaData() error {
utils.Debugf("loadMetadata()")
defer utils.Debugf("loadMetadata END")
func (devices *DeviceSet) initMetaData() error {
_, _, _, params, err := getStatus(devices.getPoolName())
if err != nil {
utils.Debugf("\n--->Err: %s\n", err)
@ -284,39 +295,64 @@ func (devices *DeviceSet) loadMetaData() error {
}
devices.NewTransactionId = devices.TransactionId
jsonData, err := ioutil.ReadFile(devices.jsonFile())
// Migrate old metadatafile
jsonData, err := ioutil.ReadFile(devices.oldMetadataFile())
if err != nil && !osIsNotExist(err) {
utils.Debugf("\n--->Err: %s\n", err)
return err
}
devices.MetaData.Devices = make(map[string]*DevInfo)
if jsonData != nil {
if err := json.Unmarshal(jsonData, &devices.MetaData); err != nil {
m := MetaData{Devices: make(map[string]*DevInfo)}
if err := json.Unmarshal(jsonData, &m); err != nil {
utils.Debugf("\n--->Err: %s\n", err)
return err
}
}
for hash, d := range devices.Devices {
d.Hash = hash
d.devices = devices
for hash, info := range m.Devices {
info.Hash = hash
if d.DeviceId >= devices.nextFreeDevice {
devices.nextFreeDevice = d.DeviceId + 1
// If the transaction id is larger than the actual one we lost the device due to some crash
if info.TransactionId <= devices.TransactionId {
devices.saveMetadata(info)
}
}
if err := osRename(devices.oldMetadataFile(), devices.oldMetadataFile()+".migrated"); err != nil {
return err
}
// If the transaction id is larger than the actual one we lost the device due to some crash
if d.TransactionId > devices.TransactionId {
utils.Debugf("Removing lost device %s with id %d", hash, d.TransactionId)
delete(devices.Devices, hash)
}
}
return nil
}
func (devices *DeviceSet) loadMetadata(hash string) *DevInfo {
info := &DevInfo{Hash: hash, devices: devices}
jsonData, err := ioutil.ReadFile(devices.metadataFile(info))
if err != nil {
return nil
}
if err := json.Unmarshal(jsonData, &info); err != nil {
return nil
}
fmt.Printf("Loaded metadata %v\n", info)
// If the transaction id is larger than the actual one we lost the device due to some crash
if info.TransactionId > devices.TransactionId {
return nil
}
return info
}
func (devices *DeviceSet) setupBaseImage() error {
oldInfo, _ := devices.lookupDevice("")
utils.Debugf("oldInfo: %p", oldInfo)
if oldInfo != nil && oldInfo.Initialized {
return nil
}
@ -331,14 +367,17 @@ func (devices *DeviceSet) setupBaseImage() error {
utils.Debugf("Initializing base device-manager snapshot")
id := devices.allocateDeviceId()
id := devices.nextDeviceId
// Create initial device
if err := createDevice(devices.getPoolDevName(), id); err != nil {
if err := createDevice(devices.getPoolDevName(), &id); err != nil {
utils.Debugf("\n--->Err: %s\n", err)
return err
}
// Ids are 24bit, so wrap around
devices.nextDeviceId = (id + 1) & 0xffffff
utils.Debugf("Registering base device (id %v) with FS size %v", id, DefaultBaseFsSize)
info, err := devices.registerDevice(id, "", DefaultBaseFsSize)
if err != nil {
@ -360,7 +399,7 @@ func (devices *DeviceSet) setupBaseImage() error {
}
info.Initialized = true
if err = devices.saveMetadata(); err != nil {
if err = devices.saveMetadata(info); err != nil {
info.Initialized = false
utils.Debugf("\n--->Err: %s\n", err)
return err
@ -388,10 +427,6 @@ func (devices *DeviceSet) log(level int, file string, line int, dmError int, mes
return // Ignore _LOG_DEBUG
}
if strings.Contains(message, "busy") {
devices.sawBusy = true
}
utils.Debugf("libdevmapper(%d): %s:%d (%d) %s", level, file, line, dmError, message)
}
@ -472,29 +507,7 @@ func (devices *DeviceSet) ResizePool(size int64) error {
func (devices *DeviceSet) initDevmapper(doInit bool) error {
logInit(devices)
// Make sure the sparse images exist in <root>/devicemapper/data and
// <root>/devicemapper/metadata
hasData := devices.hasImage("data")
hasMetadata := devices.hasImage("metadata")
if !doInit && !hasData {
return errors.New("Loopback data file not found")
}
if !doInit && !hasMetadata {
return errors.New("Loopback metadata file not found")
}
createdLoopback := !hasData || !hasMetadata
data, err := devices.ensureImage("data", DefaultDataLoopbackSize)
if err != nil {
utils.Debugf("Error device ensureImage (data): %s\n", err)
return err
}
metadata, err := devices.ensureImage("metadata", DefaultMetaDataLoopbackSize)
if err != nil {
utils.Debugf("Error device ensureImage (metadata): %s\n", err)
if err := osMkdirAll(devices.metadataDir(), 0700); err != nil && !osIsExist(err) {
return err
}
@ -527,10 +540,38 @@ func (devices *DeviceSet) initDevmapper(doInit bool) error {
// so we add this badhack to make sure it closes itself
setCloseOnExec("/dev/mapper/control")
// Make sure the sparse images exist in <root>/devicemapper/data and
// <root>/devicemapper/metadata
createdLoopback := false
// If the pool doesn't exist, create it
if info.Exists == 0 {
utils.Debugf("Pool doesn't exist. Creating it.")
hasData := devices.hasImage("data")
hasMetadata := devices.hasImage("metadata")
if !doInit && !hasData {
return errors.New("Loopback data file not found")
}
if !doInit && !hasMetadata {
return errors.New("Loopback metadata file not found")
}
createdLoopback = !hasData || !hasMetadata
data, err := devices.ensureImage("data", DefaultDataLoopbackSize)
if err != nil {
utils.Debugf("Error device ensureImage (data): %s\n", err)
return err
}
metadata, err := devices.ensureImage("metadata", DefaultMetaDataLoopbackSize)
if err != nil {
utils.Debugf("Error device ensureImage (metadata): %s\n", err)
return err
}
dataFile, err := attachLoopDevice(data)
if err != nil {
utils.Debugf("\n--->Err: %s\n", err)
@ -552,9 +593,9 @@ func (devices *DeviceSet) initDevmapper(doInit bool) error {
}
// If we didn't just create the data or metadata image, we need to
// load the metadata from the existing file.
// load the transaction id and migrate old metadata
if !createdLoopback {
if err = devices.loadMetaData(); err != nil {
if err = devices.initMetaData(); err != nil {
utils.Debugf("\n--->Err: %s\n", err)
return err
}
@ -587,13 +628,16 @@ func (devices *DeviceSet) AddDevice(hash, baseHash string) error {
return fmt.Errorf("device %s already exists", hash)
}
deviceId := devices.allocateDeviceId()
deviceId := devices.nextDeviceId
if err := devices.createSnapDevice(devices.getPoolDevName(), deviceId, baseInfo.Name(), baseInfo.DeviceId); err != nil {
if err := createSnapDevice(devices.getPoolDevName(), &deviceId, baseInfo.Name(), baseInfo.DeviceId); err != nil {
utils.Debugf("Error creating snap device: %s\n", err)
return err
}
// Ids are 24bit, so wrap around
devices.nextDeviceId = (deviceId + 1) & 0xffffff
if _, err := devices.registerDevice(deviceId, hash, baseInfo.Size); err != nil {
deleteDevice(devices.getPoolDevName(), deviceId)
utils.Debugf("Error registering device: %s\n", err)
@ -620,14 +664,6 @@ func (devices *DeviceSet) deleteDevice(info *DevInfo) error {
}
}
if info.Initialized {
info.Initialized = false
if err := devices.saveMetadata(); err != nil {
utils.Debugf("Error saving meta data: %s\n", err)
return err
}
}
if err := deleteDevice(devices.getPoolDevName(), info.DeviceId); err != nil {
utils.Debugf("Error deleting device: %s\n", err)
return err
@ -638,11 +674,11 @@ func (devices *DeviceSet) deleteDevice(info *DevInfo) error {
delete(devices.Devices, info.Hash)
devices.devicesLock.Unlock()
if err := devices.saveMetadata(); err != nil {
if err := devices.removeMetadata(info); err != nil {
devices.devicesLock.Lock()
devices.Devices[info.Hash] = info
devices.devicesLock.Unlock()
utils.Debugf("Error saving meta data: %s\n", err)
utils.Debugf("Error removing meta data: %s\n", err)
return err
}
@ -711,12 +747,11 @@ func (devices *DeviceSet) removeDeviceAndWait(devname string) error {
var err error
for i := 0; i < 1000; i++ {
devices.sawBusy = false
err = removeDevice(devname)
if err == nil {
break
}
if !devices.sawBusy {
if err != ErrBusy {
return err
}
@ -886,7 +921,7 @@ func (devices *DeviceSet) MountDevice(hash, path, mountLabel string) error {
info.mountCount = 1
info.mountPath = path
return devices.setInitialized(info)
return nil
}
func (devices *DeviceSet) UnmountDevice(hash string) error {
@ -937,14 +972,6 @@ func (devices *DeviceSet) HasDevice(hash string) bool {
return info != nil
}
func (devices *DeviceSet) HasInitializedDevice(hash string) bool {
devices.Lock()
defer devices.Unlock()
info, _ := devices.lookupDevice(hash)
return info != nil && info.Initialized
}
func (devices *DeviceSet) HasActivatedDevice(hash string) bool {
info, _ := devices.lookupDevice(hash)
if info == nil {
@ -961,17 +988,6 @@ func (devices *DeviceSet) HasActivatedDevice(hash string) bool {
return devinfo != nil && devinfo.Exists != 0
}
func (devices *DeviceSet) setInitialized(info *DevInfo) error {
info.Initialized = true
if err := devices.saveMetadata(); err != nil {
info.Initialized = false
utils.Debugf("\n--->Err: %s\n", err)
return err
}
return nil
}
func (devices *DeviceSet) List() []string {
devices.Lock()
defer devices.Unlock()