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959 lines
25 KiB
Go
959 lines
25 KiB
Go
// +build linux
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package devmapper
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import (
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"encoding/json"
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"errors"
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"fmt"
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"github.com/dotcloud/docker/utils"
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"io"
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"io/ioutil"
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"path"
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"path/filepath"
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"strconv"
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"sync"
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"time"
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)
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var (
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DefaultDataLoopbackSize int64 = 100 * 1024 * 1024 * 1024
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DefaultMetaDataLoopbackSize int64 = 2 * 1024 * 1024 * 1024
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DefaultBaseFsSize uint64 = 10 * 1024 * 1024 * 1024
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)
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type DevInfo struct {
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Hash string `json:"-"`
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DeviceId int `json:"device_id"`
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Size uint64 `json:"size"`
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TransactionId uint64 `json:"transaction_id"`
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Initialized bool `json:"initialized"`
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devices *DeviceSet `json:"-"`
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}
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type MetaData struct {
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Devices map[string]*DevInfo `json:devices`
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}
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type DeviceSet struct {
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MetaData
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sync.Mutex
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root string
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devicePrefix string
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TransactionId uint64
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NewTransactionId uint64
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nextFreeDevice int
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activeMounts map[string]int
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}
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type DiskUsage struct {
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Used uint64
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Total uint64
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}
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type Status struct {
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PoolName string
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DataLoopback string
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MetadataLoopback string
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Data DiskUsage
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Metadata DiskUsage
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SectorSize uint64
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}
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type DevStatus struct {
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DeviceId int
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Size uint64
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TransactionId uint64
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SizeInSectors uint64
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MappedSectors uint64
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HighestMappedSector uint64
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}
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func getDevName(name string) string {
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return "/dev/mapper/" + name
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}
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func (info *DevInfo) Name() string {
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hash := info.Hash
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if hash == "" {
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hash = "base"
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}
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return fmt.Sprintf("%s-%s", info.devices.devicePrefix, hash)
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}
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func (info *DevInfo) DevName() string {
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return getDevName(info.Name())
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}
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func (devices *DeviceSet) loopbackDir() string {
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return path.Join(devices.root, "devicemapper")
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}
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func (devices *DeviceSet) jsonFile() string {
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return path.Join(devices.loopbackDir(), "json")
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}
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func (devices *DeviceSet) getPoolName() string {
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return devices.devicePrefix + "-pool"
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}
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func (devices *DeviceSet) getPoolDevName() string {
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return getDevName(devices.getPoolName())
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}
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func (devices *DeviceSet) hasImage(name string) bool {
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dirname := devices.loopbackDir()
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filename := path.Join(dirname, name)
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_, err := osStat(filename)
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return err == nil
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}
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// ensureImage creates a sparse file of <size> bytes at the path
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// <root>/devicemapper/<name>.
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// If the file already exists, it does nothing.
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// Either way it returns the full path.
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func (devices *DeviceSet) ensureImage(name string, size int64) (string, error) {
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dirname := devices.loopbackDir()
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filename := path.Join(dirname, name)
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if err := osMkdirAll(dirname, 0700); err != nil && !osIsExist(err) {
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return "", err
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}
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if _, err := osStat(filename); err != nil {
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if !osIsNotExist(err) {
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return "", err
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}
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utils.Debugf("Creating loopback file %s for device-manage use", filename)
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file, err := osOpenFile(filename, osORdWr|osOCreate, 0600)
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if err != nil {
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return "", err
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}
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defer file.Close()
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if err = file.Truncate(size); err != nil {
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return "", err
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}
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}
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return filename, nil
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}
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func (devices *DeviceSet) allocateDeviceId() int {
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// TODO: Add smarter reuse of deleted devices
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id := devices.nextFreeDevice
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devices.nextFreeDevice = devices.nextFreeDevice + 1
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return id
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}
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func (devices *DeviceSet) allocateTransactionId() uint64 {
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devices.NewTransactionId = devices.NewTransactionId + 1
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return devices.NewTransactionId
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}
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func (devices *DeviceSet) saveMetadata() error {
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jsonData, err := json.Marshal(devices.MetaData)
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if err != nil {
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return fmt.Errorf("Error encoding metadata to json: %s", err)
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}
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tmpFile, err := ioutil.TempFile(filepath.Dir(devices.jsonFile()), ".json")
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if err != nil {
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return fmt.Errorf("Error creating metadata file: %s", err)
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}
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n, err := tmpFile.Write(jsonData)
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if err != nil {
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return fmt.Errorf("Error writing metadata to %s: %s", tmpFile.Name(), err)
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}
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if n < len(jsonData) {
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return io.ErrShortWrite
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}
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if err := tmpFile.Sync(); err != nil {
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return fmt.Errorf("Error syncing metadata file %s: %s", tmpFile.Name(), err)
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}
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if err := tmpFile.Close(); err != nil {
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return fmt.Errorf("Error closing metadata file %s: %s", tmpFile.Name(), err)
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}
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if err := osRename(tmpFile.Name(), devices.jsonFile()); err != nil {
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return fmt.Errorf("Error committing metadata file %s: %s", tmpFile.Name(), err)
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}
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if devices.NewTransactionId != devices.TransactionId {
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if err = setTransactionId(devices.getPoolDevName(), devices.TransactionId, devices.NewTransactionId); err != nil {
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return fmt.Errorf("Error setting devmapper transition ID: %s", err)
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}
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devices.TransactionId = devices.NewTransactionId
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}
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return nil
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}
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func (devices *DeviceSet) registerDevice(id int, hash string, size uint64) (*DevInfo, error) {
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utils.Debugf("registerDevice(%v, %v)", id, hash)
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info := &DevInfo{
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Hash: hash,
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DeviceId: id,
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Size: size,
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TransactionId: devices.allocateTransactionId(),
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Initialized: false,
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devices: devices,
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}
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devices.Devices[hash] = info
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if err := devices.saveMetadata(); err != nil {
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// Try to remove unused device
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delete(devices.Devices, hash)
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return nil, err
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}
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return info, nil
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}
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func (devices *DeviceSet) activateDeviceIfNeeded(hash string) error {
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utils.Debugf("activateDeviceIfNeeded(%v)", hash)
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info := devices.Devices[hash]
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if info == nil {
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return fmt.Errorf("Unknown device %s", hash)
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}
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if devinfo, _ := getInfo(info.Name()); devinfo != nil && devinfo.Exists != 0 {
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return nil
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}
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return activateDevice(devices.getPoolDevName(), info.Name(), info.DeviceId, info.Size)
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}
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func (devices *DeviceSet) createFilesystem(info *DevInfo) error {
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devname := info.DevName()
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err := execRun("mkfs.ext4", "-E", "discard,lazy_itable_init=0,lazy_journal_init=0", devname)
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if err != nil {
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err = execRun("mkfs.ext4", "-E", "discard,lazy_itable_init=0", devname)
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}
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if err != nil {
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utils.Debugf("\n--->Err: %s\n", err)
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return err
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}
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return nil
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}
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func (devices *DeviceSet) loadMetaData() error {
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utils.Debugf("loadMetadata()")
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defer utils.Debugf("loadMetadata END")
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_, _, _, params, err := getStatus(devices.getPoolName())
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if err != nil {
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utils.Debugf("\n--->Err: %s\n", err)
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return err
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}
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if _, err := fmt.Sscanf(params, "%d", &devices.TransactionId); err != nil {
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utils.Debugf("\n--->Err: %s\n", err)
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return err
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}
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devices.NewTransactionId = devices.TransactionId
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jsonData, err := ioutil.ReadFile(devices.jsonFile())
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if err != nil && !osIsNotExist(err) {
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utils.Debugf("\n--->Err: %s\n", err)
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return err
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}
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devices.MetaData.Devices = make(map[string]*DevInfo)
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if jsonData != nil {
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if err := json.Unmarshal(jsonData, &devices.MetaData); err != nil {
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utils.Debugf("\n--->Err: %s\n", err)
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return err
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}
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}
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for hash, d := range devices.Devices {
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d.Hash = hash
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d.devices = devices
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if d.DeviceId >= devices.nextFreeDevice {
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devices.nextFreeDevice = d.DeviceId + 1
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}
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// If the transaction id is larger than the actual one we lost the device due to some crash
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if d.TransactionId > devices.TransactionId {
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utils.Debugf("Removing lost device %s with id %d", hash, d.TransactionId)
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delete(devices.Devices, hash)
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}
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}
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return nil
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}
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func (devices *DeviceSet) setupBaseImage() error {
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oldInfo := devices.Devices[""]
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if oldInfo != nil && oldInfo.Initialized {
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return nil
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}
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if oldInfo != nil && !oldInfo.Initialized {
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utils.Debugf("Removing uninitialized base image")
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if err := devices.removeDevice(""); err != nil {
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utils.Debugf("\n--->Err: %s\n", err)
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return err
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}
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}
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utils.Debugf("Initializing base device-manager snapshot")
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id := devices.allocateDeviceId()
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// Create initial device
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if err := createDevice(devices.getPoolDevName(), id); err != nil {
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utils.Debugf("\n--->Err: %s\n", err)
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return err
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}
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utils.Debugf("Registering base device (id %v) with FS size %v", id, DefaultBaseFsSize)
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info, err := devices.registerDevice(id, "", DefaultBaseFsSize)
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if err != nil {
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_ = deleteDevice(devices.getPoolDevName(), id)
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utils.Debugf("\n--->Err: %s\n", err)
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return err
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}
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utils.Debugf("Creating filesystem on base device-manager snapshot")
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if err = devices.activateDeviceIfNeeded(""); err != nil {
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utils.Debugf("\n--->Err: %s\n", err)
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return err
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}
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if err := devices.createFilesystem(info); err != nil {
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utils.Debugf("\n--->Err: %s\n", err)
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return err
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}
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info.Initialized = true
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if err = devices.saveMetadata(); err != nil {
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info.Initialized = false
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utils.Debugf("\n--->Err: %s\n", err)
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return err
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}
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return nil
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}
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func setCloseOnExec(name string) {
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if fileInfos, _ := ioutil.ReadDir("/proc/self/fd"); fileInfos != nil {
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for _, i := range fileInfos {
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link, _ := osReadlink(filepath.Join("/proc/self/fd", i.Name()))
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if link == name {
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fd, err := strconv.Atoi(i.Name())
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if err == nil {
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sysCloseOnExec(fd)
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}
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}
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}
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}
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}
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func (devices *DeviceSet) log(level int, file string, line int, dmError int, message string) {
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if level >= 7 {
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return // Ignore _LOG_DEBUG
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}
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utils.Debugf("libdevmapper(%d): %s:%d (%d) %s", level, file, line, dmError, message)
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}
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func major(device uint64) uint64 {
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return (device >> 8) & 0xfff
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}
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func minor(device uint64) uint64 {
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return (device & 0xff) | ((device >> 12) & 0xfff00)
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}
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func (devices *DeviceSet) ResizePool(size int64) error {
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dirname := devices.loopbackDir()
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datafilename := path.Join(dirname, "data")
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metadatafilename := path.Join(dirname, "metadata")
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datafile, err := osOpenFile(datafilename, osORdWr, 0)
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if datafile == nil {
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return err
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}
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defer datafile.Close()
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fi, err := datafile.Stat()
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if fi == nil {
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return err
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}
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if fi.Size() > size {
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return fmt.Errorf("Can't shrink file")
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}
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dataloopback := FindLoopDeviceFor(datafile)
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if dataloopback == nil {
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return fmt.Errorf("Unable to find loopback mount for: %s", datafilename)
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}
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defer dataloopback.Close()
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metadatafile, err := osOpenFile(metadatafilename, osORdWr, 0)
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if metadatafile == nil {
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return err
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}
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defer metadatafile.Close()
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metadataloopback := FindLoopDeviceFor(metadatafile)
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if metadataloopback == nil {
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return fmt.Errorf("Unable to find loopback mount for: %s", metadatafilename)
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}
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defer metadataloopback.Close()
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// Grow loopback file
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if err := datafile.Truncate(size); err != nil {
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return fmt.Errorf("Unable to grow loopback file: %s", err)
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}
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// Reload size for loopback device
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if err := LoopbackSetCapacity(dataloopback); err != nil {
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return fmt.Errorf("Unable to update loopback capacity: %s", err)
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}
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// Suspend the pool
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if err := suspendDevice(devices.getPoolName()); err != nil {
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return fmt.Errorf("Unable to suspend pool: %s", err)
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}
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// Reload with the new block sizes
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if err := reloadPool(devices.getPoolName(), dataloopback, metadataloopback); err != nil {
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return fmt.Errorf("Unable to reload pool: %s", err)
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}
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// Resume the pool
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if err := resumeDevice(devices.getPoolName()); err != nil {
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return fmt.Errorf("Unable to resume pool: %s", err)
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}
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return nil
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}
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func (devices *DeviceSet) initDevmapper(doInit bool) error {
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logInit(devices)
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// Make sure the sparse images exist in <root>/devicemapper/data and
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// <root>/devicemapper/metadata
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hasData := devices.hasImage("data")
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hasMetadata := devices.hasImage("metadata")
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if !doInit && !hasData {
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return errors.New("Loopback data file not found")
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}
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if !doInit && !hasMetadata {
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return errors.New("Loopback metadata file not found")
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}
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createdLoopback := !hasData || !hasMetadata
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data, err := devices.ensureImage("data", DefaultDataLoopbackSize)
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if err != nil {
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utils.Debugf("Error device ensureImage (data): %s\n", err)
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return err
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}
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metadata, err := devices.ensureImage("metadata", DefaultMetaDataLoopbackSize)
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if err != nil {
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utils.Debugf("Error device ensureImage (metadata): %s\n", err)
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return err
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}
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// Set the device prefix from the device id and inode of the docker root dir
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st, err := osStat(devices.root)
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if err != nil {
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return fmt.Errorf("Error looking up dir %s: %s", devices.root, err)
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}
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sysSt := toSysStatT(st.Sys())
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// "reg-" stands for "regular file".
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// In the future we might use "dev-" for "device file", etc.
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// docker-maj,min[-inode] stands for:
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// - Managed by docker
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// - The target of this device is at major <maj> and minor <min>
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// - If <inode> is defined, use that file inside the device as a loopback image. Otherwise use the device itself.
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devices.devicePrefix = fmt.Sprintf("docker-%d:%d-%d", major(sysSt.Dev), minor(sysSt.Dev), sysSt.Ino)
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utils.Debugf("Generated prefix: %s", devices.devicePrefix)
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// Check for the existence of the device <prefix>-pool
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utils.Debugf("Checking for existence of the pool '%s'", devices.getPoolName())
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info, err := getInfo(devices.getPoolName())
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if info == nil {
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utils.Debugf("Error device getInfo: %s", err)
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return err
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}
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// It seems libdevmapper opens this without O_CLOEXEC, and go exec will not close files
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// that are not Close-on-exec, and lxc-start will die if it inherits any unexpected files,
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// so we add this badhack to make sure it closes itself
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setCloseOnExec("/dev/mapper/control")
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// If the pool doesn't exist, create it
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if info.Exists == 0 {
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utils.Debugf("Pool doesn't exist. Creating it.")
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dataFile, err := attachLoopDevice(data)
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if err != nil {
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utils.Debugf("\n--->Err: %s\n", err)
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return err
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}
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defer dataFile.Close()
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metadataFile, err := attachLoopDevice(metadata)
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if err != nil {
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utils.Debugf("\n--->Err: %s\n", err)
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return err
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}
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defer metadataFile.Close()
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if err := createPool(devices.getPoolName(), dataFile, metadataFile); err != nil {
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utils.Debugf("\n--->Err: %s\n", err)
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return err
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}
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}
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// If we didn't just create the data or metadata image, we need to
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// load the metadata from the existing file.
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if !createdLoopback {
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if err = devices.loadMetaData(); err != nil {
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utils.Debugf("\n--->Err: %s\n", err)
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return err
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}
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}
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// Setup the base image
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if doInit {
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if err := devices.setupBaseImage(); err != nil {
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utils.Debugf("Error device setupBaseImage: %s\n", err)
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return err
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}
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}
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return nil
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}
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func (devices *DeviceSet) AddDevice(hash, baseHash string) error {
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devices.Lock()
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defer devices.Unlock()
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if devices.Devices[hash] != nil {
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return fmt.Errorf("hash %s already exists", hash)
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}
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baseInfo := devices.Devices[baseHash]
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if baseInfo == nil {
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return fmt.Errorf("Error adding device for '%s': can't find device for parent '%s'", hash, baseHash)
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}
|
|
|
|
deviceId := devices.allocateDeviceId()
|
|
|
|
if err := devices.createSnapDevice(devices.getPoolDevName(), deviceId, baseInfo.Name(), baseInfo.DeviceId); err != nil {
|
|
utils.Debugf("Error creating snap device: %s\n", err)
|
|
return err
|
|
}
|
|
|
|
if _, err := devices.registerDevice(deviceId, hash, baseInfo.Size); err != nil {
|
|
deleteDevice(devices.getPoolDevName(), deviceId)
|
|
utils.Debugf("Error registering device: %s\n", err)
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (devices *DeviceSet) removeDevice(hash string) error {
|
|
info := devices.Devices[hash]
|
|
if info == nil {
|
|
return fmt.Errorf("hash %s doesn't exists", hash)
|
|
}
|
|
|
|
devinfo, _ := getInfo(info.Name())
|
|
if devinfo != nil && devinfo.Exists != 0 {
|
|
if err := removeDevice(info.Name()); err != nil {
|
|
utils.Debugf("Error removing device: %s\n", err)
|
|
return err
|
|
}
|
|
}
|
|
|
|
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
|
|
}
|
|
|
|
devices.allocateTransactionId()
|
|
delete(devices.Devices, info.Hash)
|
|
|
|
if err := devices.saveMetadata(); err != nil {
|
|
devices.Devices[info.Hash] = info
|
|
utils.Debugf("Error saving meta data: %s\n", err)
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (devices *DeviceSet) RemoveDevice(hash string) error {
|
|
devices.Lock()
|
|
defer devices.Unlock()
|
|
|
|
return devices.removeDevice(hash)
|
|
}
|
|
|
|
func (devices *DeviceSet) deactivateDevice(hash string) error {
|
|
utils.Debugf("[devmapper] deactivateDevice(%s)", hash)
|
|
defer utils.Debugf("[devmapper] deactivateDevice END")
|
|
var devname string
|
|
// FIXME: shouldn't we just register the pool into devices?
|
|
devname, err := devices.byHash(hash)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
devinfo, err := getInfo(devname)
|
|
if err != nil {
|
|
utils.Debugf("\n--->Err: %s\n", err)
|
|
return err
|
|
}
|
|
if devinfo.Exists != 0 {
|
|
if err := removeDevice(devname); err != nil {
|
|
utils.Debugf("\n--->Err: %s\n", err)
|
|
return err
|
|
}
|
|
if err := devices.waitRemove(hash); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// waitRemove blocks until either:
|
|
// a) the device registered at <device_set_prefix>-<hash> is removed,
|
|
// or b) the 1 second timeout expires.
|
|
func (devices *DeviceSet) waitRemove(hash string) error {
|
|
utils.Debugf("[deviceset %s] waitRemove(%s)", devices.devicePrefix, hash)
|
|
defer utils.Debugf("[deviceset %s] waitRemove(%) END", devices.devicePrefix, hash)
|
|
devname, err := devices.byHash(hash)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
i := 0
|
|
for ; i < 1000; i += 1 {
|
|
devinfo, err := getInfo(devname)
|
|
if err != nil {
|
|
// If there is an error we assume the device doesn't exist.
|
|
// The error might actually be something else, but we can't differentiate.
|
|
return nil
|
|
}
|
|
if i%100 == 0 {
|
|
utils.Debugf("Waiting for removal of %s: exists=%d", devname, devinfo.Exists)
|
|
}
|
|
if devinfo.Exists == 0 {
|
|
break
|
|
}
|
|
|
|
time.Sleep(1 * time.Millisecond)
|
|
}
|
|
if i == 1000 {
|
|
return fmt.Errorf("Timeout while waiting for device %s to be removed", devname)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// waitClose blocks until either:
|
|
// a) the device registered at <device_set_prefix>-<hash> is closed,
|
|
// or b) the 1 second timeout expires.
|
|
func (devices *DeviceSet) waitClose(hash string) error {
|
|
devname, err := devices.byHash(hash)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
i := 0
|
|
for ; i < 1000; i += 1 {
|
|
devinfo, err := getInfo(devname)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if i%100 == 0 {
|
|
utils.Debugf("Waiting for unmount of %s: opencount=%d", devname, devinfo.OpenCount)
|
|
}
|
|
if devinfo.OpenCount == 0 {
|
|
break
|
|
}
|
|
time.Sleep(1 * time.Millisecond)
|
|
}
|
|
if i == 1000 {
|
|
return fmt.Errorf("Timeout while waiting for device %s to close", devname)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// byHash is a hack to allow looking up the deviceset's pool by the hash "pool".
|
|
// FIXME: it seems probably cleaner to register the pool in devices.Devices,
|
|
// but I am afraid of arcane implications deep in the devicemapper code,
|
|
// so this will do.
|
|
func (devices *DeviceSet) byHash(hash string) (devname string, err error) {
|
|
if hash == "pool" {
|
|
return devices.getPoolDevName(), nil
|
|
}
|
|
info := devices.Devices[hash]
|
|
if info == nil {
|
|
return "", fmt.Errorf("hash %s doesn't exists", hash)
|
|
}
|
|
return info.Name(), nil
|
|
}
|
|
|
|
func (devices *DeviceSet) Shutdown() error {
|
|
devices.Lock()
|
|
defer devices.Unlock()
|
|
|
|
utils.Debugf("[deviceset %s] shutdown()", devices.devicePrefix)
|
|
utils.Debugf("[devmapper] Shutting down DeviceSet: %s", devices.root)
|
|
defer utils.Debugf("[deviceset %s] shutdown END", devices.devicePrefix)
|
|
|
|
for path, count := range devices.activeMounts {
|
|
for i := count; i > 0; i-- {
|
|
if err := sysUnmount(path, 0); err != nil {
|
|
utils.Debugf("Shutdown unmounting %s, error: %s\n", path, err)
|
|
}
|
|
}
|
|
delete(devices.activeMounts, path)
|
|
}
|
|
|
|
for _, d := range devices.Devices {
|
|
if err := devices.waitClose(d.Hash); err != nil {
|
|
utils.Errorf("Warning: error waiting for device %s to unmount: %s\n", d.Hash, err)
|
|
}
|
|
if err := devices.deactivateDevice(d.Hash); err != nil {
|
|
utils.Debugf("Shutdown deactivate %s , error: %s\n", d.Hash, err)
|
|
}
|
|
}
|
|
|
|
pool := devices.getPoolDevName()
|
|
if devinfo, err := getInfo(pool); err == nil && devinfo.Exists != 0 {
|
|
if err := devices.deactivateDevice("pool"); err != nil {
|
|
utils.Debugf("Shutdown deactivate %s , error: %s\n", pool, err)
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (devices *DeviceSet) MountDevice(hash, path string, readOnly bool) error {
|
|
devices.Lock()
|
|
defer devices.Unlock()
|
|
|
|
if err := devices.activateDeviceIfNeeded(hash); err != nil {
|
|
return fmt.Errorf("Error activating devmapper device for '%s': %s", hash, err)
|
|
}
|
|
|
|
info := devices.Devices[hash]
|
|
|
|
var flags uintptr = sysMsMgcVal
|
|
|
|
if readOnly {
|
|
flags = flags | sysMsRdOnly
|
|
}
|
|
|
|
err := sysMount(info.DevName(), path, "ext4", flags, "discard")
|
|
if err != nil && err == sysEInval {
|
|
err = sysMount(info.DevName(), path, "ext4", flags, "")
|
|
}
|
|
if err != nil {
|
|
return fmt.Errorf("Error mounting '%s' on '%s': %s", info.DevName(), path, err)
|
|
}
|
|
|
|
count := devices.activeMounts[path]
|
|
devices.activeMounts[path] = count + 1
|
|
|
|
return devices.setInitialized(hash)
|
|
}
|
|
|
|
func (devices *DeviceSet) UnmountDevice(hash, path string, deactivate bool) error {
|
|
utils.Debugf("[devmapper] UnmountDevice(hash=%s path=%s)", hash, path)
|
|
defer utils.Debugf("[devmapper] UnmountDevice END")
|
|
devices.Lock()
|
|
defer devices.Unlock()
|
|
|
|
utils.Debugf("[devmapper] Unmount(%s)", path)
|
|
if err := sysUnmount(path, 0); err != nil {
|
|
utils.Debugf("\n--->Err: %s\n", err)
|
|
return err
|
|
}
|
|
utils.Debugf("[devmapper] Unmount done")
|
|
// Wait for the unmount to be effective,
|
|
// by watching the value of Info.OpenCount for the device
|
|
if err := devices.waitClose(hash); err != nil {
|
|
return err
|
|
}
|
|
|
|
if count := devices.activeMounts[path]; count > 1 {
|
|
devices.activeMounts[path] = count - 1
|
|
} else {
|
|
delete(devices.activeMounts, path)
|
|
}
|
|
|
|
if deactivate {
|
|
devices.deactivateDevice(hash)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (devices *DeviceSet) HasDevice(hash string) bool {
|
|
devices.Lock()
|
|
defer devices.Unlock()
|
|
|
|
return devices.Devices[hash] != nil
|
|
}
|
|
|
|
func (devices *DeviceSet) HasInitializedDevice(hash string) bool {
|
|
devices.Lock()
|
|
defer devices.Unlock()
|
|
|
|
info := devices.Devices[hash]
|
|
return info != nil && info.Initialized
|
|
}
|
|
|
|
func (devices *DeviceSet) HasActivatedDevice(hash string) bool {
|
|
devices.Lock()
|
|
defer devices.Unlock()
|
|
|
|
info := devices.Devices[hash]
|
|
if info == nil {
|
|
return false
|
|
}
|
|
devinfo, _ := getInfo(info.Name())
|
|
return devinfo != nil && devinfo.Exists != 0
|
|
}
|
|
|
|
func (devices *DeviceSet) setInitialized(hash string) error {
|
|
info := devices.Devices[hash]
|
|
if info == nil {
|
|
return fmt.Errorf("Unknown device %s", hash)
|
|
}
|
|
|
|
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()
|
|
|
|
ids := make([]string, len(devices.Devices))
|
|
i := 0
|
|
for k := range devices.Devices {
|
|
ids[i] = k
|
|
i++
|
|
}
|
|
return ids
|
|
}
|
|
|
|
func (devices *DeviceSet) deviceStatus(devName string) (sizeInSectors, mappedSectors, highestMappedSector uint64, err error) {
|
|
var params string
|
|
_, sizeInSectors, _, params, err = getStatus(devName)
|
|
if err != nil {
|
|
return
|
|
}
|
|
if _, err = fmt.Sscanf(params, "%d %d", &mappedSectors, &highestMappedSector); err == nil {
|
|
return
|
|
}
|
|
return
|
|
}
|
|
|
|
func (devices *DeviceSet) GetDeviceStatus(hash string) (*DevStatus, error) {
|
|
devices.Lock()
|
|
defer devices.Unlock()
|
|
|
|
info := devices.Devices[hash]
|
|
if info == nil {
|
|
return nil, fmt.Errorf("No device %s", hash)
|
|
}
|
|
|
|
status := &DevStatus{
|
|
DeviceId: info.DeviceId,
|
|
Size: info.Size,
|
|
TransactionId: info.TransactionId,
|
|
}
|
|
|
|
if err := devices.activateDeviceIfNeeded(hash); err != nil {
|
|
return nil, fmt.Errorf("Error activating devmapper device for '%s': %s", hash, err)
|
|
}
|
|
|
|
if sizeInSectors, mappedSectors, highestMappedSector, err := devices.deviceStatus(info.DevName()); err != nil {
|
|
return nil, err
|
|
} else {
|
|
status.SizeInSectors = sizeInSectors
|
|
status.MappedSectors = mappedSectors
|
|
status.HighestMappedSector = highestMappedSector
|
|
}
|
|
|
|
return status, nil
|
|
}
|
|
|
|
func (devices *DeviceSet) poolStatus() (totalSizeInSectors, transactionId, dataUsed, dataTotal, metadataUsed, metadataTotal uint64, err error) {
|
|
var params string
|
|
if _, totalSizeInSectors, _, params, err = getStatus(devices.getPoolName()); err == nil {
|
|
_, err = fmt.Sscanf(params, "%d %d/%d %d/%d", &transactionId, &metadataUsed, &metadataTotal, &dataUsed, &dataTotal)
|
|
}
|
|
return
|
|
}
|
|
|
|
func (devices *DeviceSet) Status() *Status {
|
|
devices.Lock()
|
|
defer devices.Unlock()
|
|
|
|
status := &Status{}
|
|
|
|
status.PoolName = devices.getPoolName()
|
|
status.DataLoopback = path.Join(devices.loopbackDir(), "data")
|
|
status.MetadataLoopback = path.Join(devices.loopbackDir(), "metadata")
|
|
|
|
totalSizeInSectors, _, dataUsed, dataTotal, metadataUsed, metadataTotal, err := devices.poolStatus()
|
|
if err == nil {
|
|
// Convert from blocks to bytes
|
|
blockSizeInSectors := totalSizeInSectors / dataTotal
|
|
|
|
status.Data.Used = dataUsed * blockSizeInSectors * 512
|
|
status.Data.Total = dataTotal * blockSizeInSectors * 512
|
|
|
|
// metadata blocks are always 4k
|
|
status.Metadata.Used = metadataUsed * 4096
|
|
status.Metadata.Total = metadataTotal * 4096
|
|
|
|
status.SectorSize = blockSizeInSectors * 512
|
|
}
|
|
|
|
return status
|
|
}
|
|
|
|
func NewDeviceSet(root string, doInit bool) (*DeviceSet, error) {
|
|
SetDevDir("/dev")
|
|
|
|
devices := &DeviceSet{
|
|
root: root,
|
|
MetaData: MetaData{Devices: make(map[string]*DevInfo)},
|
|
activeMounts: make(map[string]int),
|
|
}
|
|
|
|
if err := devices.initDevmapper(doInit); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return devices, nil
|
|
}
|