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deviceset.go
File metadata and controls
2822 lines (2366 loc) · 84.5 KB
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//go:build linux
// +build linux
package devmapper // import "github.com/docker/docker/daemon/graphdriver/devmapper"
import (
"bufio"
"encoding/json"
"fmt"
"io"
"os"
"os/exec"
"path"
"path/filepath"
"reflect"
"strconv"
"strings"
"sync"
"time"
"github.com/docker/docker/daemon/graphdriver"
"github.com/docker/docker/dockerversion"
"github.com/docker/docker/pkg/devicemapper"
"github.com/docker/docker/pkg/dmesg"
"github.com/docker/docker/pkg/idtools"
"github.com/docker/docker/pkg/loopback"
"github.com/docker/docker/pkg/parsers"
"github.com/docker/docker/pkg/parsers/kernel"
units "github.com/docker/go-units"
"github.com/moby/sys/mount"
"github.com/opencontainers/selinux/go-selinux/label"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"golang.org/x/sys/unix"
)
var (
defaultDataLoopbackSize int64 = 100 * 1024 * 1024 * 1024
defaultMetaDataLoopbackSize int64 = 2 * 1024 * 1024 * 1024
defaultBaseFsSize uint64 = 10 * 1024 * 1024 * 1024
defaultThinpBlockSize uint32 = 128 // 64K = 128 512b sectors
defaultUdevSyncOverride = false
maxDeviceID = 0xffffff // 24 bit, pool limit
deviceIDMapSz = (maxDeviceID + 1) / 8
driverDeferredRemovalSupport = false
enableDeferredRemoval = false
enableDeferredDeletion = false
userBaseSize = false
defaultMinFreeSpacePercent uint32 = 10
lvmSetupConfigForce bool
)
const deviceSetMetaFile = "deviceset-metadata"
const transactionMetaFile = "transaction-metadata"
type transaction struct {
OpenTransactionID uint64 `json:"open_transaction_id"`
DeviceIDHash string `json:"device_hash"`
DeviceID int `json:"device_id"`
}
type devInfo struct {
Hash string `json:"-"`
DeviceID int `json:"device_id"`
Size uint64 `json:"size"`
TransactionID uint64 `json:"transaction_id"`
Initialized bool `json:"initialized"`
Deleted bool `json:"deleted"`
devices *DeviceSet
// The global DeviceSet lock guarantees that we serialize all
// the calls to libdevmapper (which is not threadsafe), but we
// sometimes release that lock while sleeping. In that case
// this per-device lock is still held, protecting against
// other accesses to the device that we're doing the wait on.
//
// WARNING: In order to avoid AB-BA deadlocks when releasing
// the global lock while holding the per-device locks all
// device locks must be acquired *before* the device lock, and
// multiple device locks should be acquired parent before child.
lock sync.Mutex
}
type metaData struct {
Devices map[string]*devInfo `json:"Devices"`
}
// DeviceSet holds information about list of devices
type DeviceSet struct {
metaData `json:"-"`
sync.Mutex `json:"-"` // Protects all fields of DeviceSet and serializes calls into libdevmapper
root string
devicePrefix string
TransactionID uint64 `json:"-"`
NextDeviceID int `json:"next_device_id"`
deviceIDMap []byte
// Options
dataLoopbackSize int64
metaDataLoopbackSize int64
baseFsSize uint64
filesystem string
mountOptions string
mkfsArgs []string
dataDevice string // block or loop dev
dataLoopFile string // loopback file, if used
metadataDevice string // block or loop dev
metadataLoopFile string // loopback file, if used
doBlkDiscard bool
thinpBlockSize uint32
thinPoolDevice string
transaction `json:"-"`
overrideUdevSyncCheck bool
deferredRemove bool // use deferred removal
deferredDelete bool // use deferred deletion
BaseDeviceUUID string // save UUID of base device
BaseDeviceFilesystem string // save filesystem of base device
nrDeletedDevices uint // number of deleted devices
deletionWorkerTicker *time.Ticker
idMap idtools.IdentityMapping
minFreeSpacePercent uint32 // min free space percentage in thinpool
xfsNospaceRetries string // max retries when xfs receives ENOSPC
lvmSetupConfig directLVMConfig
}
// DiskUsage contains information about disk usage and is used when reporting Status of a device.
type DiskUsage struct {
// Used bytes on the disk.
Used uint64
// Total bytes on the disk.
Total uint64
// Available bytes on the disk.
Available uint64
}
// Status returns the information about the device.
type Status struct {
// PoolName is the name of the data pool.
PoolName string
// DataFile is the actual block device for data.
DataFile string
// DataLoopback loopback file, if used.
DataLoopback string
// MetadataFile is the actual block device for metadata.
MetadataFile string
// MetadataLoopback is the loopback file, if used.
MetadataLoopback string
// Data is the disk used for data.
Data DiskUsage
// Metadata is the disk used for meta data.
Metadata DiskUsage
// BaseDeviceSize is base size of container and image
BaseDeviceSize uint64
// BaseDeviceFS is backing filesystem.
BaseDeviceFS string
// SectorSize size of the vector.
SectorSize uint64
// UdevSyncSupported is true if sync is supported.
UdevSyncSupported bool
// DeferredRemoveEnabled is true then the device is not unmounted.
DeferredRemoveEnabled bool
// True if deferred deletion is enabled. This is different from
// deferred removal. "removal" means that device mapper device is
// deactivated. Thin device is still in thin pool and can be activated
// again. But "deletion" means that thin device will be deleted from
// thin pool and it can't be activated again.
DeferredDeleteEnabled bool
DeferredDeletedDeviceCount uint
MinFreeSpace uint64
}
// Structure used to export image/container metadata in docker inspect.
type deviceMetadata struct {
deviceID int
deviceSize uint64 // size in bytes
deviceName string // Device name as used during activation
}
// DevStatus returns information about device mounted containing its id, size and sector information.
type DevStatus struct {
// DeviceID is the id of the device.
DeviceID int
// Size is the size of the filesystem.
Size uint64
// TransactionID is a unique integer per device set used to identify an operation on the file system, this number is incremental.
TransactionID uint64
// SizeInSectors indicates the size of the sectors allocated.
SizeInSectors uint64
// MappedSectors indicates number of mapped sectors.
MappedSectors uint64
// HighestMappedSector is the pointer to the highest mapped sector.
HighestMappedSector uint64
}
func getDevName(name string) string {
return "/dev/mapper/" + name
}
func (info *devInfo) Name() string {
hash := info.Hash
if hash == "" {
hash = "base"
}
return fmt.Sprintf("%s-%s", info.devices.devicePrefix, hash)
}
func (info *devInfo) DevName() string {
return getDevName(info.Name())
}
func (devices *DeviceSet) loopbackDir() string {
return path.Join(devices.root, "devicemapper")
}
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) transactionMetaFile() string {
return path.Join(devices.metadataDir(), transactionMetaFile)
}
func (devices *DeviceSet) deviceSetMetaFile() string {
return path.Join(devices.metadataDir(), deviceSetMetaFile)
}
func (devices *DeviceSet) oldMetadataFile() string {
return path.Join(devices.loopbackDir(), "json")
}
func (devices *DeviceSet) getPoolName() string {
if devices.thinPoolDevice == "" {
return devices.devicePrefix + "-pool"
}
return devices.thinPoolDevice
}
func (devices *DeviceSet) getPoolDevName() string {
return getDevName(devices.getPoolName())
}
func (devices *DeviceSet) hasImage(name string) bool {
dirname := devices.loopbackDir()
filename := path.Join(dirname, name)
_, err := os.Stat(filename)
return err == nil
}
// ensureImage creates a sparse file of <size> bytes at the path
// <root>/devicemapper/<name>.
// If the file already exists and new size is larger than its current size, it grows to the new size.
// Either way it returns the full path.
func (devices *DeviceSet) ensureImage(name string, size int64) (string, error) {
dirname := devices.loopbackDir()
filename := path.Join(dirname, name)
if err := idtools.MkdirAllAndChown(dirname, 0700, devices.idMap.RootPair()); err != nil {
return "", err
}
if fi, err := os.Stat(filename); err != nil {
if !os.IsNotExist(err) {
return "", err
}
logrus.WithField("storage-driver", "devicemapper").Debugf("Creating loopback file %s for device-manage use", filename)
file, err := os.OpenFile(filename, os.O_RDWR|os.O_CREATE, 0600)
if err != nil {
return "", err
}
defer file.Close()
if err := file.Truncate(size); err != nil {
return "", err
}
} else {
if fi.Size() < size {
file, err := os.OpenFile(filename, os.O_RDWR|os.O_CREATE, 0600)
if err != nil {
return "", err
}
defer file.Close()
if err := file.Truncate(size); err != nil {
return "", fmt.Errorf("devmapper: Unable to grow loopback file %s: %v", filename, err)
}
} else if fi.Size() > size {
logrus.WithField("storage-driver", "devicemapper").Warnf("Can't shrink loopback file %s", filename)
}
}
return filename, nil
}
func (devices *DeviceSet) allocateTransactionID() uint64 {
devices.OpenTransactionID = devices.TransactionID + 1
return devices.OpenTransactionID
}
func (devices *DeviceSet) updatePoolTransactionID() error {
if err := devicemapper.SetTransactionID(devices.getPoolDevName(), devices.TransactionID, devices.OpenTransactionID); err != nil {
return fmt.Errorf("devmapper: Error setting devmapper transaction ID: %s", err)
}
devices.TransactionID = devices.OpenTransactionID
return nil
}
func (devices *DeviceSet) removeMetadata(info *devInfo) error {
if err := os.RemoveAll(devices.metadataFile(info)); err != nil {
return fmt.Errorf("devmapper: Error removing metadata file %s: %s", devices.metadataFile(info), err)
}
return nil
}
// Given json data and file path, write it to disk
func (devices *DeviceSet) writeMetaFile(jsonData []byte, filePath string) error {
tmpFile, err := os.CreateTemp(devices.metadataDir(), ".tmp")
if err != nil {
return fmt.Errorf("devmapper: Error creating metadata file: %s", err)
}
n, err := tmpFile.Write(jsonData)
if err != nil {
return fmt.Errorf("devmapper: Error writing metadata to %s: %s", tmpFile.Name(), err)
}
if n < len(jsonData) {
return io.ErrShortWrite
}
if err := tmpFile.Sync(); err != nil {
return fmt.Errorf("devmapper: Error syncing metadata file %s: %s", tmpFile.Name(), err)
}
if err := tmpFile.Close(); err != nil {
return fmt.Errorf("devmapper: Error closing metadata file %s: %s", tmpFile.Name(), err)
}
if err := os.Rename(tmpFile.Name(), filePath); err != nil {
return fmt.Errorf("devmapper: Error committing metadata file %s: %s", tmpFile.Name(), err)
}
return nil
}
func (devices *DeviceSet) saveMetadata(info *devInfo) error {
jsonData, err := json.Marshal(info)
if err != nil {
return fmt.Errorf("devmapper: Error encoding metadata to json: %s", err)
}
return devices.writeMetaFile(jsonData, devices.metadataFile(info))
}
func (devices *DeviceSet) markDeviceIDUsed(deviceID int) {
var mask byte
i := deviceID % 8
mask = 1 << uint(i)
devices.deviceIDMap[deviceID/8] = devices.deviceIDMap[deviceID/8] | mask
}
func (devices *DeviceSet) markDeviceIDFree(deviceID int) {
var mask byte
i := deviceID % 8
mask = ^(1 << uint(i))
devices.deviceIDMap[deviceID/8] = devices.deviceIDMap[deviceID/8] & mask
}
func (devices *DeviceSet) isDeviceIDFree(deviceID int) bool {
var mask byte
i := deviceID % 8
mask = (1 << uint(i))
return (devices.deviceIDMap[deviceID/8] & mask) == 0
}
// Should be called with devices.Lock() held.
func (devices *DeviceSet) lookupDevice(hash string) (*devInfo, error) {
info := devices.Devices[hash]
if info == nil {
info = devices.loadMetadata(hash)
if info == nil {
return nil, fmt.Errorf("devmapper: Unknown device %s", hash)
}
devices.Devices[hash] = info
}
return info, nil
}
func (devices *DeviceSet) lookupDeviceWithLock(hash string) (*devInfo, error) {
devices.Lock()
defer devices.Unlock()
info, err := devices.lookupDevice(hash)
return info, err
}
// This function relies on that device hash map has been loaded in advance.
// Should be called with devices.Lock() held.
func (devices *DeviceSet) constructDeviceIDMap() {
logrus.WithField("storage-driver", "devicemapper").Debug("constructDeviceIDMap()")
defer logrus.WithField("storage-driver", "devicemapper").Debug("constructDeviceIDMap() END")
for _, info := range devices.Devices {
devices.markDeviceIDUsed(info.DeviceID)
logrus.WithField("storage-driver", "devicemapper").Debugf("Added deviceId=%d to DeviceIdMap", info.DeviceID)
}
}
func (devices *DeviceSet) deviceFileWalkFunction(path string, finfo os.FileInfo) error {
logger := logrus.WithField("storage-driver", "devicemapper")
// Skip some of the meta files which are not device files.
if strings.HasSuffix(finfo.Name(), ".migrated") {
logger.Debugf("Skipping file %s", path)
return nil
}
if strings.HasPrefix(finfo.Name(), ".") {
logger.Debugf("Skipping file %s", path)
return nil
}
if finfo.Name() == deviceSetMetaFile {
logger.Debugf("Skipping file %s", path)
return nil
}
if finfo.Name() == transactionMetaFile {
logger.Debugf("Skipping file %s", path)
return nil
}
logger.Debugf("Loading data for file %s", path)
hash := finfo.Name()
if hash == "base" {
hash = ""
}
// Include deleted devices also as cleanup delete device logic
// will go through it and see if there are any deleted devices.
if _, err := devices.lookupDevice(hash); err != nil {
return fmt.Errorf("devmapper: Error looking up device %s:%v", hash, err)
}
return nil
}
func (devices *DeviceSet) loadDeviceFilesOnStart() error {
logrus.WithField("storage-driver", "devicemapper").Debug("loadDeviceFilesOnStart()")
defer logrus.WithField("storage-driver", "devicemapper").Debug("loadDeviceFilesOnStart() END")
var scan = func(path string, info os.FileInfo, err error) error {
if err != nil {
logrus.WithField("storage-driver", "devicemapper").Debugf("Can't walk the file %s", path)
return nil
}
// Skip any directories
if info.IsDir() {
return nil
}
return devices.deviceFileWalkFunction(path, info)
}
return filepath.Walk(devices.metadataDir(), scan)
}
// Should be called with devices.Lock() held.
func (devices *DeviceSet) unregisterDevice(hash string) error {
logrus.WithField("storage-driver", "devicemapper").Debugf("unregisterDevice(%v)", hash)
info := &devInfo{
Hash: hash,
}
delete(devices.Devices, hash)
if err := devices.removeMetadata(info); err != nil {
logrus.WithField("storage-driver", "devicemapper").Debugf("Error removing metadata: %s", err)
return err
}
return nil
}
// Should be called with devices.Lock() held.
func (devices *DeviceSet) registerDevice(id int, hash string, size uint64, transactionID uint64) (*devInfo, error) {
logrus.WithField("storage-driver", "devicemapper").Debugf("registerDevice(%v, %v)", id, hash)
info := &devInfo{
Hash: hash,
DeviceID: id,
Size: size,
TransactionID: transactionID,
Initialized: false,
devices: devices,
}
devices.Devices[hash] = info
if err := devices.saveMetadata(info); err != nil {
// Try to remove unused device
delete(devices.Devices, hash)
return nil, err
}
return info, nil
}
func (devices *DeviceSet) activateDeviceIfNeeded(info *devInfo, ignoreDeleted bool) error {
logrus.WithField("storage-driver", "devicemapper").Debugf("activateDeviceIfNeeded(%v)", info.Hash)
if info.Deleted && !ignoreDeleted {
return fmt.Errorf("devmapper: Can't activate device %v as it is marked for deletion", info.Hash)
}
// Make sure deferred removal on device is canceled, if one was
// scheduled.
if err := devices.cancelDeferredRemovalIfNeeded(info); err != nil {
return fmt.Errorf("devmapper: Device Deferred Removal Cancellation Failed: %s", err)
}
if devinfo, _ := devicemapper.GetInfo(info.Name()); devinfo != nil && devinfo.Exists != 0 {
return nil
}
return devicemapper.ActivateDevice(devices.getPoolDevName(), info.Name(), info.DeviceID, info.Size)
}
// xfsSupported checks if xfs is supported, returns nil if it is, otherwise an error
func xfsSupported() error {
// Make sure mkfs.xfs is available
if _, err := exec.LookPath("mkfs.xfs"); err != nil {
return err // error text is descriptive enough
}
mountTarget, err := os.MkdirTemp("", "supportsXFS")
if err != nil {
return errors.Wrapf(err, "error checking for xfs support")
}
/* The mounting will fail--after the module has been loaded.*/
defer os.RemoveAll(mountTarget)
unix.Mount("none", mountTarget, "xfs", 0, "")
f, err := os.Open("/proc/filesystems")
if err != nil {
return errors.Wrapf(err, "error checking for xfs support")
}
defer f.Close()
s := bufio.NewScanner(f)
for s.Scan() {
if strings.HasSuffix(s.Text(), "\txfs") {
return nil
}
}
if err := s.Err(); err != nil {
return errors.Wrapf(err, "error checking for xfs support")
}
return errors.New(`kernel does not support xfs, or "modprobe xfs" failed`)
}
func determineDefaultFS() string {
err := xfsSupported()
if err == nil {
return "xfs"
}
logrus.WithField("storage-driver", "devicemapper").Warnf("XFS is not supported in your system (%v). Defaulting to ext4 filesystem", err)
return "ext4"
}
// mkfsOptions tries to figure out whether some additional mkfs options are required
func mkfsOptions(fs string) []string {
if fs == "xfs" && !kernel.CheckKernelVersion(3, 16, 0) {
// For kernels earlier than 3.16 (and newer xfsutils),
// some xfs features need to be explicitly disabled.
return []string{"-m", "crc=0,finobt=0"}
}
return []string{}
}
func (devices *DeviceSet) createFilesystem(info *devInfo) (err error) {
devname := info.DevName()
if devices.filesystem == "" {
devices.filesystem = determineDefaultFS()
}
if err := devices.saveBaseDeviceFilesystem(devices.filesystem); err != nil {
return err
}
args := mkfsOptions(devices.filesystem)
args = append(args, devices.mkfsArgs...)
args = append(args, devname)
logrus.WithField("storage-driver", "devicemapper").Infof("Creating filesystem %s on device %s, mkfs args: %v", devices.filesystem, info.Name(), args)
defer func() {
if err != nil {
logrus.WithField("storage-driver", "devicemapper").Infof("Error while creating filesystem %s on device %s: %v", devices.filesystem, info.Name(), err)
} else {
logrus.WithField("storage-driver", "devicemapper").Infof("Successfully created filesystem %s on device %s", devices.filesystem, info.Name())
}
}()
switch devices.filesystem {
case "xfs":
err = exec.Command("mkfs.xfs", args...).Run()
case "ext4":
err = exec.Command("mkfs.ext4", append([]string{"-E", "nodiscard,lazy_itable_init=0,lazy_journal_init=0"}, args...)...).Run()
if err != nil {
err = exec.Command("mkfs.ext4", append([]string{"-E", "nodiscard,lazy_itable_init=0"}, args...)...).Run()
}
if err != nil {
return err
}
err = exec.Command("tune2fs", append([]string{"-c", "-1", "-i", "0"}, devname)...).Run()
default:
err = fmt.Errorf("devmapper: Unsupported filesystem type %s", devices.filesystem)
}
return
}
func (devices *DeviceSet) migrateOldMetaData() error {
// Migrate old metadata file
jsonData, err := os.ReadFile(devices.oldMetadataFile())
if err != nil && !os.IsNotExist(err) {
return err
}
if jsonData != nil {
m := metaData{Devices: make(map[string]*devInfo)}
if err := json.Unmarshal(jsonData, &m); err != nil {
return err
}
for hash, info := range m.Devices {
info.Hash = hash
devices.saveMetadata(info)
}
if err := os.Rename(devices.oldMetadataFile(), devices.oldMetadataFile()+".migrated"); err != nil {
return err
}
}
return nil
}
// Cleanup deleted devices. It assumes that all the devices have been
// loaded in the hash table.
func (devices *DeviceSet) cleanupDeletedDevices() error {
devices.Lock()
// If there are no deleted devices, there is nothing to do.
if devices.nrDeletedDevices == 0 {
devices.Unlock()
return nil
}
var deletedDevices []*devInfo
for _, info := range devices.Devices {
if !info.Deleted {
continue
}
logrus.WithField("storage-driver", "devicemapper").Debugf("Found deleted device %s.", info.Hash)
deletedDevices = append(deletedDevices, info)
}
// Delete the deleted devices. DeleteDevice() first takes the info lock
// and then devices.Lock(). So drop it to avoid deadlock.
devices.Unlock()
for _, info := range deletedDevices {
// This will again try deferred deletion.
if err := devices.DeleteDevice(info.Hash, false); err != nil {
logrus.WithField("storage-driver", "devicemapper").Warnf("Deletion of device %s, device_id=%v failed:%v", info.Hash, info.DeviceID, err)
}
}
return nil
}
func (devices *DeviceSet) countDeletedDevices() {
for _, info := range devices.Devices {
if !info.Deleted {
continue
}
devices.nrDeletedDevices++
}
}
func (devices *DeviceSet) startDeviceDeletionWorker() {
// Deferred deletion is not enabled. Don't do anything.
if !devices.deferredDelete {
return
}
logrus.WithField("storage-driver", "devicemapper").Debug("Worker to cleanup deleted devices started")
for range devices.deletionWorkerTicker.C {
devices.cleanupDeletedDevices()
}
}
func (devices *DeviceSet) initMetaData() error {
devices.Lock()
defer devices.Unlock()
if err := devices.migrateOldMetaData(); err != nil {
return err
}
_, transactionID, _, _, _, _, err := devices.poolStatus()
if err != nil {
return err
}
devices.TransactionID = transactionID
if err := devices.loadDeviceFilesOnStart(); err != nil {
return fmt.Errorf("devmapper: Failed to load device files:%v", err)
}
devices.constructDeviceIDMap()
devices.countDeletedDevices()
if err := devices.processPendingTransaction(); err != nil {
return err
}
// Start a goroutine to cleanup Deleted Devices
go devices.startDeviceDeletionWorker()
return nil
}
func (devices *DeviceSet) incNextDeviceID() {
// IDs are 24bit, so wrap around
devices.NextDeviceID = (devices.NextDeviceID + 1) & maxDeviceID
}
func (devices *DeviceSet) getNextFreeDeviceID() (int, error) {
devices.incNextDeviceID()
for i := 0; i <= maxDeviceID; i++ {
if devices.isDeviceIDFree(devices.NextDeviceID) {
devices.markDeviceIDUsed(devices.NextDeviceID)
return devices.NextDeviceID, nil
}
devices.incNextDeviceID()
}
return 0, fmt.Errorf("devmapper: Unable to find a free device ID")
}
func (devices *DeviceSet) poolHasFreeSpace() error {
if devices.minFreeSpacePercent == 0 {
return nil
}
_, _, dataUsed, dataTotal, metadataUsed, metadataTotal, err := devices.poolStatus()
if err != nil {
return err
}
minFreeData := (dataTotal * uint64(devices.minFreeSpacePercent)) / 100
if minFreeData < 1 {
minFreeData = 1
}
dataFree := dataTotal - dataUsed
if dataFree < minFreeData {
return fmt.Errorf("devmapper: Thin Pool has %v free data blocks which is less than minimum required %v free data blocks. Create more free space in thin pool or use dm.min_free_space option to change behavior", (dataTotal - dataUsed), minFreeData)
}
minFreeMetadata := (metadataTotal * uint64(devices.minFreeSpacePercent)) / 100
if minFreeMetadata < 1 {
minFreeMetadata = 1
}
metadataFree := metadataTotal - metadataUsed
if metadataFree < minFreeMetadata {
return fmt.Errorf("devmapper: Thin Pool has %v free metadata blocks which is less than minimum required %v free metadata blocks. Create more free metadata space in thin pool or use dm.min_free_space option to change behavior", (metadataTotal - metadataUsed), minFreeMetadata)
}
return nil
}
func (devices *DeviceSet) createRegisterDevice(hash string) (*devInfo, error) {
devices.Lock()
defer devices.Unlock()
deviceID, err := devices.getNextFreeDeviceID()
if err != nil {
return nil, err
}
logger := logrus.WithField("storage-driver", "devicemapper")
if err := devices.openTransaction(hash, deviceID); err != nil {
logger.Debugf("Error opening transaction hash = %s deviceID = %d", hash, deviceID)
devices.markDeviceIDFree(deviceID)
return nil, err
}
for {
if err := devicemapper.CreateDevice(devices.getPoolDevName(), deviceID); err != nil {
if devicemapper.DeviceIDExists(err) {
// Device ID already exists. This should not
// happen. Now we have a mechanism to find
// a free device ID. So something is not right.
// Give a warning and continue.
logger.Errorf("Device ID %d exists in pool but it is supposed to be unused", deviceID)
deviceID, err = devices.getNextFreeDeviceID()
if err != nil {
return nil, err
}
// Save new device id into transaction
devices.refreshTransaction(deviceID)
continue
}
logger.Debugf("Error creating device: %s", err)
devices.markDeviceIDFree(deviceID)
return nil, err
}
break
}
logger.Debugf("Registering device (id %v) with FS size %v", deviceID, devices.baseFsSize)
info, err := devices.registerDevice(deviceID, hash, devices.baseFsSize, devices.OpenTransactionID)
if err != nil {
_ = devicemapper.DeleteDevice(devices.getPoolDevName(), deviceID)
devices.markDeviceIDFree(deviceID)
return nil, err
}
if err := devices.closeTransaction(); err != nil {
devices.unregisterDevice(hash)
devicemapper.DeleteDevice(devices.getPoolDevName(), deviceID)
devices.markDeviceIDFree(deviceID)
return nil, err
}
return info, nil
}
func (devices *DeviceSet) takeSnapshot(hash string, baseInfo *devInfo, size uint64) error {
var (
devinfo *devicemapper.Info
err error
)
if err = devices.poolHasFreeSpace(); err != nil {
return err
}
if devices.deferredRemove {
devinfo, err = devicemapper.GetInfoWithDeferred(baseInfo.Name())
if err != nil {
return err
}
if devinfo != nil && devinfo.DeferredRemove != 0 {
err = devices.cancelDeferredRemoval(baseInfo)
if err != nil {
// If Error is ErrEnxio. Device is probably already gone. Continue.
if err != devicemapper.ErrEnxio {
return err
}
devinfo = nil
} else {
defer devices.deactivateDevice(baseInfo)
}
}
} else {
devinfo, err = devicemapper.GetInfo(baseInfo.Name())
if err != nil {
return err
}
}
doSuspend := devinfo != nil && devinfo.Exists != 0
if doSuspend {
if err = devicemapper.SuspendDevice(baseInfo.Name()); err != nil {
return err
}
defer devicemapper.ResumeDevice(baseInfo.Name())
}
return devices.createRegisterSnapDevice(hash, baseInfo, size)
}
func (devices *DeviceSet) createRegisterSnapDevice(hash string, baseInfo *devInfo, size uint64) error {
deviceID, err := devices.getNextFreeDeviceID()
if err != nil {
return err
}
logger := logrus.WithField("storage-driver", "devicemapper")
if err := devices.openTransaction(hash, deviceID); err != nil {
logger.Debugf("Error opening transaction hash = %s deviceID = %d", hash, deviceID)
devices.markDeviceIDFree(deviceID)
return err
}
for {
if err := devicemapper.CreateSnapDeviceRaw(devices.getPoolDevName(), deviceID, baseInfo.DeviceID); err != nil {
if devicemapper.DeviceIDExists(err) {
// Device ID already exists. This should not
// happen. Now we have a mechanism to find
// a free device ID. So something is not right.
// Give a warning and continue.
logger.Errorf("Device ID %d exists in pool but it is supposed to be unused", deviceID)
deviceID, err = devices.getNextFreeDeviceID()
if err != nil {
return err
}
// Save new device id into transaction
devices.refreshTransaction(deviceID)
continue
}
logger.Debugf("Error creating snap device: %s", err)
devices.markDeviceIDFree(deviceID)
return err
}
break
}
if _, err := devices.registerDevice(deviceID, hash, size, devices.OpenTransactionID); err != nil {
devicemapper.DeleteDevice(devices.getPoolDevName(), deviceID)
devices.markDeviceIDFree(deviceID)
logger.Debugf("Error registering device: %s", err)
return err
}
if err := devices.closeTransaction(); err != nil {
devices.unregisterDevice(hash)
devicemapper.DeleteDevice(devices.getPoolDevName(), deviceID)
devices.markDeviceIDFree(deviceID)
return err
}
return nil
}
func (devices *DeviceSet) loadMetadata(hash string) *devInfo {
info := &devInfo{Hash: hash, devices: devices}
logger := logrus.WithField("storage-driver", "devicemapper")
jsonData, err := os.ReadFile(devices.metadataFile(info))
if err != nil {
logger.Debugf("Failed to read %s with err: %v", devices.metadataFile(info), err)
return nil
}
if err := json.Unmarshal(jsonData, &info); err != nil {
logger.Debugf("Failed to unmarshal devInfo from %s with err: %v", devices.metadataFile(info), err)
return nil
}
if info.DeviceID > maxDeviceID {
logger.Errorf("Ignoring Invalid DeviceId=%d", info.DeviceID)
return nil
}
return info
}
func getDeviceUUID(device string) (string, error) {
out, err := exec.Command("blkid", "-s", "UUID", "-o", "value", device).Output()
if err != nil {
return "", fmt.Errorf("devmapper: Failed to find uuid for device %s:%v", device, err)
}
uuid := strings.TrimSuffix(string(out), "\n")
uuid = strings.TrimSpace(uuid)
logrus.WithField("storage-driver", "devicemapper").Debugf("UUID for device: %s is:%s", device, uuid)
return uuid, nil
}
func (devices *DeviceSet) getBaseDeviceSize() uint64 {
info, _ := devices.lookupDevice("")
if info == nil {
return 0
}
return info.Size
}
func (devices *DeviceSet) getBaseDeviceFS() string {
return devices.BaseDeviceFilesystem
}
func (devices *DeviceSet) verifyBaseDeviceUUIDFS(baseInfo *devInfo) error {
devices.Lock()
defer devices.Unlock()
if err := devices.activateDeviceIfNeeded(baseInfo, false); err != nil {