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https://github.com/moby/moby.git
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2615 lines
75 KiB
Go
2615 lines
75 KiB
Go
// +build linux
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package devmapper
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import (
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"bufio"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"os/exec"
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"path"
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"path/filepath"
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"strconv"
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"strings"
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"sync"
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"syscall"
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"time"
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"github.com/Sirupsen/logrus"
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"github.com/docker/docker/daemon/graphdriver"
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"github.com/docker/docker/dockerversion"
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"github.com/docker/docker/pkg/devicemapper"
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"github.com/docker/docker/pkg/idtools"
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"github.com/docker/docker/pkg/loopback"
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"github.com/docker/docker/pkg/mount"
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"github.com/docker/docker/pkg/parsers"
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"github.com/docker/go-units"
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"github.com/opencontainers/runc/libcontainer/label"
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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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defaultThinpBlockSize uint32 = 128 // 64K = 128 512b sectors
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defaultUdevSyncOverride = false
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maxDeviceID = 0xffffff // 24 bit, pool limit
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deviceIDMapSz = (maxDeviceID + 1) / 8
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// We retry device removal so many a times that even error messages
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// will fill up console during normal operation. So only log Fatal
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// messages by default.
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logLevel = devicemapper.LogLevelFatal
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driverDeferredRemovalSupport = false
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enableDeferredRemoval = false
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enableDeferredDeletion = false
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userBaseSize = false
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defaultMinFreeSpacePercent uint32 = 10
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)
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const deviceSetMetaFile string = "deviceset-metadata"
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const transactionMetaFile string = "transaction-metadata"
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type transaction struct {
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OpenTransactionID uint64 `json:"open_transaction_id"`
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DeviceIDHash string `json:"device_hash"`
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DeviceID int `json:"device_id"`
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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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Deleted bool `json:"deleted"`
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devices *DeviceSet
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// The global DeviceSet lock guarantees that we serialize all
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// the calls to libdevmapper (which is not threadsafe), but we
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// sometimes release that lock while sleeping. In that case
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// this per-device lock is still held, protecting against
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// other accesses to the device that we're doing the wait on.
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//
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// WARNING: In order to avoid AB-BA deadlocks when releasing
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// the global lock while holding the per-device locks all
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// device locks must be acquired *before* the device lock, and
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// multiple device locks should be acquired parent before child.
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lock sync.Mutex
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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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// DeviceSet holds information about list of devices
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type DeviceSet struct {
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metaData `json:"-"`
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sync.Mutex `json:"-"` // Protects all fields of DeviceSet and serializes calls into libdevmapper
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root string
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devicePrefix string
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TransactionID uint64 `json:"-"`
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NextDeviceID int `json:"next_device_id"`
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deviceIDMap []byte
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// Options
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dataLoopbackSize int64
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metaDataLoopbackSize int64
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baseFsSize uint64
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filesystem string
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mountOptions string
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mkfsArgs []string
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dataDevice string // block or loop dev
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dataLoopFile string // loopback file, if used
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metadataDevice string // block or loop dev
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metadataLoopFile string // loopback file, if used
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doBlkDiscard bool
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thinpBlockSize uint32
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thinPoolDevice string
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transaction `json:"-"`
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overrideUdevSyncCheck bool
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deferredRemove bool // use deferred removal
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deferredDelete bool // use deferred deletion
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BaseDeviceUUID string // save UUID of base device
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BaseDeviceFilesystem string // save filesystem of base device
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nrDeletedDevices uint // number of deleted devices
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deletionWorkerTicker *time.Ticker
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uidMaps []idtools.IDMap
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gidMaps []idtools.IDMap
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minFreeSpacePercent uint32 //min free space percentage in thinpool
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}
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// DiskUsage contains information about disk usage and is used when reporting Status of a device.
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type DiskUsage struct {
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// Used bytes on the disk.
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Used uint64
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// Total bytes on the disk.
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Total uint64
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// Available bytes on the disk.
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Available uint64
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}
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// Status returns the information about the device.
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type Status struct {
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// PoolName is the name of the data pool.
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PoolName string
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// DataFile is the actual block device for data.
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DataFile string
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// DataLoopback loopback file, if used.
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DataLoopback string
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// MetadataFile is the actual block device for metadata.
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MetadataFile string
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// MetadataLoopback is the loopback file, if used.
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MetadataLoopback string
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// Data is the disk used for data.
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Data DiskUsage
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// Metadata is the disk used for meta data.
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Metadata DiskUsage
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// BaseDeviceSize is base size of container and image
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BaseDeviceSize uint64
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// BaseDeviceFS is backing filesystem.
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BaseDeviceFS string
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// SectorSize size of the vector.
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SectorSize uint64
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// UdevSyncSupported is true if sync is supported.
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UdevSyncSupported bool
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// DeferredRemoveEnabled is true then the device is not unmounted.
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DeferredRemoveEnabled bool
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// True if deferred deletion is enabled. This is different from
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// deferred removal. "removal" means that device mapper device is
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// deactivated. Thin device is still in thin pool and can be activated
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// again. But "deletion" means that thin device will be deleted from
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// thin pool and it can't be activated again.
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DeferredDeleteEnabled bool
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DeferredDeletedDeviceCount uint
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}
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// Structure used to export image/container metadata in docker inspect.
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type deviceMetadata struct {
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deviceID int
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deviceSize uint64 // size in bytes
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deviceName string // Device name as used during activation
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}
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// DevStatus returns information about device mounted containing its id, size and sector information.
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type DevStatus struct {
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// DeviceID is the id of the device.
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DeviceID int
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// Size is the size of the filesystem.
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Size uint64
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// TransactionID is a unique integer per device set used to identify an operation on the file system, this number is incremental.
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TransactionID uint64
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// SizeInSectors indicates the size of the sectors allocated.
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SizeInSectors uint64
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// MappedSectors indicates number of mapped sectors.
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MappedSectors uint64
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// HighestMappedSector is the pointer to the highest mapped sector.
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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) metadataDir() string {
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return path.Join(devices.root, "metadata")
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}
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func (devices *DeviceSet) metadataFile(info *devInfo) string {
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file := info.Hash
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if file == "" {
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file = "base"
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}
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return path.Join(devices.metadataDir(), file)
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}
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func (devices *DeviceSet) transactionMetaFile() string {
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return path.Join(devices.metadataDir(), transactionMetaFile)
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}
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func (devices *DeviceSet) deviceSetMetaFile() string {
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return path.Join(devices.metadataDir(), deviceSetMetaFile)
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}
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func (devices *DeviceSet) oldMetadataFile() 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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if devices.thinPoolDevice == "" {
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return devices.devicePrefix + "-pool"
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}
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return devices.thinPoolDevice
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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 := os.Stat(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 and new size is larger than its current size, it grows to the new size.
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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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uid, gid, err := idtools.GetRootUIDGID(devices.uidMaps, devices.gidMaps)
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if err != nil {
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return "", err
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}
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if err := idtools.MkdirAllAs(dirname, 0700, uid, gid); err != nil && !os.IsExist(err) {
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return "", err
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}
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if fi, err := os.Stat(filename); err != nil {
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if !os.IsNotExist(err) {
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return "", err
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}
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logrus.Debugf("devmapper: Creating loopback file %s for device-manage use", filename)
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file, err := os.OpenFile(filename, os.O_RDWR|os.O_CREATE, 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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} else {
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if fi.Size() < size {
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file, err := os.OpenFile(filename, os.O_RDWR|os.O_CREATE, 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 "", fmt.Errorf("devmapper: Unable to grow loopback file %s: %v", filename, err)
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}
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} else if fi.Size() > size {
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logrus.Warnf("devmapper: Can't shrink loopback file %s", filename)
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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) allocateTransactionID() uint64 {
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devices.OpenTransactionID = devices.TransactionID + 1
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return devices.OpenTransactionID
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}
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func (devices *DeviceSet) updatePoolTransactionID() error {
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if err := devicemapper.SetTransactionID(devices.getPoolDevName(), devices.TransactionID, devices.OpenTransactionID); err != nil {
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return fmt.Errorf("devmapper: Error setting devmapper transaction ID: %s", err)
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}
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devices.TransactionID = devices.OpenTransactionID
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return nil
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}
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func (devices *DeviceSet) removeMetadata(info *devInfo) error {
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if err := os.RemoveAll(devices.metadataFile(info)); err != nil {
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return fmt.Errorf("devmapper: Error removing metadata file %s: %s", devices.metadataFile(info), err)
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}
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return nil
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}
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// Given json data and file path, write it to disk
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func (devices *DeviceSet) writeMetaFile(jsonData []byte, filePath string) error {
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tmpFile, err := ioutil.TempFile(devices.metadataDir(), ".tmp")
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if err != nil {
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return fmt.Errorf("devmapper: 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("devmapper: 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("devmapper: 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("devmapper: Error closing metadata file %s: %s", tmpFile.Name(), err)
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}
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if err := os.Rename(tmpFile.Name(), filePath); err != nil {
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return fmt.Errorf("devmapper: Error committing metadata file %s: %s", tmpFile.Name(), err)
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}
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return nil
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}
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func (devices *DeviceSet) saveMetadata(info *devInfo) error {
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jsonData, err := json.Marshal(info)
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if err != nil {
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return fmt.Errorf("devmapper: Error encoding metadata to json: %s", err)
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}
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if err := devices.writeMetaFile(jsonData, devices.metadataFile(info)); err != nil {
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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) markDeviceIDUsed(deviceID int) {
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var mask byte
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i := deviceID % 8
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mask = 1 << uint(i)
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devices.deviceIDMap[deviceID/8] = devices.deviceIDMap[deviceID/8] | mask
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}
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func (devices *DeviceSet) markDeviceIDFree(deviceID int) {
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var mask byte
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i := deviceID % 8
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mask = ^(1 << uint(i))
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devices.deviceIDMap[deviceID/8] = devices.deviceIDMap[deviceID/8] & mask
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}
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func (devices *DeviceSet) isDeviceIDFree(deviceID int) bool {
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var mask byte
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i := deviceID % 8
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mask = (1 << uint(i))
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if (devices.deviceIDMap[deviceID/8] & mask) != 0 {
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return false
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}
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return true
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}
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// Should be called with devices.Lock() held.
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func (devices *DeviceSet) lookupDevice(hash string) (*devInfo, error) {
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info := devices.Devices[hash]
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if info == nil {
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info = devices.loadMetadata(hash)
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if info == nil {
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return nil, fmt.Errorf("devmapper: Unknown device %s", hash)
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}
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devices.Devices[hash] = info
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}
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return info, nil
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}
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func (devices *DeviceSet) lookupDeviceWithLock(hash string) (*devInfo, error) {
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devices.Lock()
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defer devices.Unlock()
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info, err := devices.lookupDevice(hash)
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return info, err
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}
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// This function relies on that device hash map has been loaded in advance.
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// Should be called with devices.Lock() held.
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func (devices *DeviceSet) constructDeviceIDMap() {
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logrus.Debugf("devmapper: constructDeviceIDMap()")
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defer logrus.Debugf("devmapper: constructDeviceIDMap() END")
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for _, info := range devices.Devices {
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devices.markDeviceIDUsed(info.DeviceID)
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logrus.Debugf("devmapper: Added deviceId=%d to DeviceIdMap", info.DeviceID)
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}
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}
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func (devices *DeviceSet) deviceFileWalkFunction(path string, finfo os.FileInfo) error {
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// Skip some of the meta files which are not device files.
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if strings.HasSuffix(finfo.Name(), ".migrated") {
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logrus.Debugf("devmapper: Skipping file %s", path)
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return nil
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}
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if strings.HasPrefix(finfo.Name(), ".") {
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logrus.Debugf("devmapper: Skipping file %s", path)
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return nil
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}
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if finfo.Name() == deviceSetMetaFile {
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logrus.Debugf("devmapper: Skipping file %s", path)
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return nil
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}
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if finfo.Name() == transactionMetaFile {
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logrus.Debugf("devmapper: Skipping file %s", path)
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return nil
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}
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logrus.Debugf("devmapper: Loading data for file %s", path)
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hash := finfo.Name()
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if hash == "base" {
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hash = ""
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}
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// Include deleted devices also as cleanup delete device logic
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// will go through it and see if there are any deleted devices.
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if _, err := devices.lookupDevice(hash); err != nil {
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return fmt.Errorf("devmapper: Error looking up device %s:%v", hash, err)
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}
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return nil
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}
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func (devices *DeviceSet) loadDeviceFilesOnStart() error {
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logrus.Debugf("devmapper: loadDeviceFilesOnStart()")
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defer logrus.Debugf("devmapper: loadDeviceFilesOnStart() END")
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var scan = func(path string, info os.FileInfo, err error) error {
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if err != nil {
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logrus.Debugf("devmapper: Can't walk the file %s", path)
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return nil
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}
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// Skip any directories
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if info.IsDir() {
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return nil
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}
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return devices.deviceFileWalkFunction(path, info)
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}
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return filepath.Walk(devices.metadataDir(), scan)
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}
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|
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// Should be called with devices.Lock() held.
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func (devices *DeviceSet) unregisterDevice(id int, hash string) error {
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logrus.Debugf("devmapper: unregisterDevice(%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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}
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delete(devices.Devices, hash)
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if err := devices.removeMetadata(info); err != nil {
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logrus.Debugf("devmapper: Error removing metadata: %s", 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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|
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// Should be called with devices.Lock() held.
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func (devices *DeviceSet) registerDevice(id int, hash string, size uint64, transactionID uint64) (*devInfo, error) {
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logrus.Debugf("devmapper: 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: transactionID,
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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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|
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if err := devices.saveMetadata(info); 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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|
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return info, nil
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}
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|
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func (devices *DeviceSet) activateDeviceIfNeeded(info *devInfo, ignoreDeleted bool) error {
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logrus.Debugf("devmapper: activateDeviceIfNeeded(%v)", info.Hash)
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|
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if info.Deleted && !ignoreDeleted {
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return fmt.Errorf("devmapper: Can't activate device %v as it is marked for deletion", info.Hash)
|
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}
|
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|
|
// Make sure deferred removal on device is canceled, if one was
|
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// scheduled.
|
|
if err := devices.cancelDeferredRemoval(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)
|
|
}
|
|
|
|
// Return true only if kernel supports xfs and mkfs.xfs is available
|
|
func xfsSupported() bool {
|
|
// Make sure mkfs.xfs is available
|
|
if _, err := exec.LookPath("mkfs.xfs"); err != nil {
|
|
return false
|
|
}
|
|
|
|
// Check if kernel supports xfs filesystem or not.
|
|
exec.Command("modprobe", "xfs").Run()
|
|
|
|
f, err := os.Open("/proc/filesystems")
|
|
if err != nil {
|
|
logrus.Warnf("devmapper: Could not check if xfs is supported: %v", err)
|
|
return false
|
|
}
|
|
defer f.Close()
|
|
|
|
s := bufio.NewScanner(f)
|
|
for s.Scan() {
|
|
if strings.HasSuffix(s.Text(), "\txfs") {
|
|
return true
|
|
}
|
|
}
|
|
|
|
if err := s.Err(); err != nil {
|
|
logrus.Warnf("devmapper: Could not check if xfs is supported: %v", err)
|
|
}
|
|
return false
|
|
}
|
|
|
|
func determineDefaultFS() string {
|
|
if xfsSupported() {
|
|
return "xfs"
|
|
}
|
|
|
|
logrus.Warn("devmapper: XFS is not supported in your system. Either the kernel doesn't support it or mkfs.xfs is not in your PATH. Defaulting to ext4 filesystem")
|
|
return "ext4"
|
|
}
|
|
|
|
func (devices *DeviceSet) createFilesystem(info *devInfo) (err error) {
|
|
devname := info.DevName()
|
|
|
|
args := []string{}
|
|
for _, arg := range devices.mkfsArgs {
|
|
args = append(args, arg)
|
|
}
|
|
|
|
args = append(args, devname)
|
|
|
|
if devices.filesystem == "" {
|
|
devices.filesystem = determineDefaultFS()
|
|
}
|
|
if err := devices.saveBaseDeviceFilesystem(devices.filesystem); err != nil {
|
|
return err
|
|
}
|
|
|
|
logrus.Infof("devmapper: Creating filesystem %s on device %s", devices.filesystem, info.Name())
|
|
defer func() {
|
|
if err != nil {
|
|
logrus.Infof("devmapper: Error while creating filesystem %s on device %s: %v", devices.filesystem, info.Name(), err)
|
|
} else {
|
|
logrus.Infof("devmapper: 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 := ioutil.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.Debugf("devmapper: 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.Warnf("devmapper: 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.Debugf("devmapper: 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
|
|
}
|
|
|
|
if err := devices.openTransaction(hash, deviceID); err != nil {
|
|
logrus.Debugf("devmapper: 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.
|
|
logrus.Errorf("devmapper: 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
|
|
}
|
|
logrus.Debugf("devmapper: Error creating device: %s", err)
|
|
devices.markDeviceIDFree(deviceID)
|
|
return nil, err
|
|
}
|
|
break
|
|
}
|
|
|
|
logrus.Debugf("devmapper: 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(deviceID, hash)
|
|
devicemapper.DeleteDevice(devices.getPoolDevName(), deviceID)
|
|
devices.markDeviceIDFree(deviceID)
|
|
return nil, err
|
|
}
|
|
return info, nil
|
|
}
|
|
|
|
func (devices *DeviceSet) createRegisterSnapDevice(hash string, baseInfo *devInfo, size uint64) error {
|
|
if err := devices.poolHasFreeSpace(); err != nil {
|
|
return err
|
|
}
|
|
|
|
deviceID, err := devices.getNextFreeDeviceID()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if err := devices.openTransaction(hash, deviceID); err != nil {
|
|
logrus.Debugf("devmapper: Error opening transaction hash = %s deviceID = %d", hash, deviceID)
|
|
devices.markDeviceIDFree(deviceID)
|
|
return err
|
|
}
|
|
|
|
for {
|
|
if err := devicemapper.CreateSnapDevice(devices.getPoolDevName(), deviceID, baseInfo.Name(), 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.
|
|
logrus.Errorf("devmapper: 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
|
|
}
|
|
logrus.Debugf("devmapper: 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)
|
|
logrus.Debugf("devmapper: Error registering device: %s", err)
|
|
return err
|
|
}
|
|
|
|
if err := devices.closeTransaction(); err != nil {
|
|
devices.unregisterDevice(deviceID, 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}
|
|
|
|
jsonData, err := ioutil.ReadFile(devices.metadataFile(info))
|
|
if err != nil {
|
|
return nil
|
|
}
|
|
|
|
if err := json.Unmarshal(jsonData, &info); err != nil {
|
|
return nil
|
|
}
|
|
|
|
if info.DeviceID > maxDeviceID {
|
|
logrus.Errorf("devmapper: 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.Debugf("devmapper: 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 {
|
|
return err
|
|
}
|
|
defer devices.deactivateDevice(baseInfo)
|
|
|
|
uuid, err := getDeviceUUID(baseInfo.DevName())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if devices.BaseDeviceUUID != uuid {
|
|
return fmt.Errorf("devmapper: Current Base Device UUID:%s does not match with stored UUID:%s. Possibly using a different thin pool than last invocation", uuid, devices.BaseDeviceUUID)
|
|
}
|
|
|
|
if devices.BaseDeviceFilesystem == "" {
|
|
fsType, err := ProbeFsType(baseInfo.DevName())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if err := devices.saveBaseDeviceFilesystem(fsType); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
// If user specified a filesystem using dm.fs option and current
|
|
// file system of base image is not same, warn user that dm.fs
|
|
// will be ignored.
|
|
if devices.BaseDeviceFilesystem != devices.filesystem {
|
|
logrus.Warnf("devmapper: Base device already exists and has filesystem %s on it. User specified filesystem %s will be ignored.", devices.BaseDeviceFilesystem, devices.filesystem)
|
|
devices.filesystem = devices.BaseDeviceFilesystem
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (devices *DeviceSet) saveBaseDeviceFilesystem(fs string) error {
|
|
devices.BaseDeviceFilesystem = fs
|
|
return devices.saveDeviceSetMetaData()
|
|
}
|
|
|
|
func (devices *DeviceSet) saveBaseDeviceUUID(baseInfo *devInfo) error {
|
|
devices.Lock()
|
|
defer devices.Unlock()
|
|
|
|
if err := devices.activateDeviceIfNeeded(baseInfo, false); err != nil {
|
|
return err
|
|
}
|
|
defer devices.deactivateDevice(baseInfo)
|
|
|
|
uuid, err := getDeviceUUID(baseInfo.DevName())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
devices.BaseDeviceUUID = uuid
|
|
return devices.saveDeviceSetMetaData()
|
|
}
|
|
|
|
func (devices *DeviceSet) createBaseImage() error {
|
|
logrus.Debugf("devmapper: Initializing base device-mapper thin volume")
|
|
|
|
// Create initial device
|
|
info, err := devices.createRegisterDevice("")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
logrus.Debugf("devmapper: Creating filesystem on base device-mapper thin volume")
|
|
|
|
if err := devices.activateDeviceIfNeeded(info, false); err != nil {
|
|
return err
|
|
}
|
|
|
|
if err := devices.createFilesystem(info); err != nil {
|
|
return err
|
|
}
|
|
|
|
info.Initialized = true
|
|
if err := devices.saveMetadata(info); err != nil {
|
|
info.Initialized = false
|
|
return err
|
|
}
|
|
|
|
if err := devices.saveBaseDeviceUUID(info); err != nil {
|
|
return fmt.Errorf("devmapper: Could not query and save base device UUID:%v", err)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// Returns if thin pool device exists or not. If device exists, also makes
|
|
// sure it is a thin pool device and not some other type of device.
|
|
func (devices *DeviceSet) thinPoolExists(thinPoolDevice string) (bool, error) {
|
|
logrus.Debugf("devmapper: Checking for existence of the pool %s", thinPoolDevice)
|
|
|
|
info, err := devicemapper.GetInfo(thinPoolDevice)
|
|
if err != nil {
|
|
return false, fmt.Errorf("devmapper: GetInfo() on device %s failed: %v", thinPoolDevice, err)
|
|
}
|
|
|
|
// Device does not exist.
|
|
if info.Exists == 0 {
|
|
return false, nil
|
|
}
|
|
|
|
_, _, deviceType, _, err := devicemapper.GetStatus(thinPoolDevice)
|
|
if err != nil {
|
|
return false, fmt.Errorf("devmapper: GetStatus() on device %s failed: %v", thinPoolDevice, err)
|
|
}
|
|
|
|
if deviceType != "thin-pool" {
|
|
return false, fmt.Errorf("devmapper: Device %s is not a thin pool", thinPoolDevice)
|
|
}
|
|
|
|
return true, nil
|
|
}
|
|
|
|
func (devices *DeviceSet) checkThinPool() error {
|
|
_, transactionID, dataUsed, _, _, _, err := devices.poolStatus()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if dataUsed != 0 {
|
|
return fmt.Errorf("devmapper: Unable to take ownership of thin-pool (%s) that already has used data blocks",
|
|
devices.thinPoolDevice)
|
|
}
|
|
if transactionID != 0 {
|
|
return fmt.Errorf("devmapper: Unable to take ownership of thin-pool (%s) with non-zero transaction ID",
|
|
devices.thinPoolDevice)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Base image is initialized properly. Either save UUID for first time (for
|
|
// upgrade case or verify UUID.
|
|
func (devices *DeviceSet) setupVerifyBaseImageUUIDFS(baseInfo *devInfo) error {
|
|
// If BaseDeviceUUID is nil (upgrade case), save it and return success.
|
|
if devices.BaseDeviceUUID == "" {
|
|
if err := devices.saveBaseDeviceUUID(baseInfo); err != nil {
|
|
return fmt.Errorf("devmapper: Could not query and save base device UUID:%v", err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
if err := devices.verifyBaseDeviceUUIDFS(baseInfo); err != nil {
|
|
return fmt.Errorf("devmapper: Base Device UUID and Filesystem verification failed.%v", err)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (devices *DeviceSet) checkGrowBaseDeviceFS(info *devInfo) error {
|
|
|
|
if !userBaseSize {
|
|
return nil
|
|
}
|
|
|
|
if devices.baseFsSize < devices.getBaseDeviceSize() {
|
|
return fmt.Errorf("devmapper: Base device size cannot be smaller than %s", units.HumanSize(float64(devices.getBaseDeviceSize())))
|
|
}
|
|
|
|
if devices.baseFsSize == devices.getBaseDeviceSize() {
|
|
return nil
|
|
}
|
|
|
|
info.lock.Lock()
|
|
defer info.lock.Unlock()
|
|
|
|
devices.Lock()
|
|
defer devices.Unlock()
|
|
|
|
info.Size = devices.baseFsSize
|
|
|
|
if err := devices.saveMetadata(info); err != nil {
|
|
// Try to remove unused device
|
|
delete(devices.Devices, info.Hash)
|
|
return err
|
|
}
|
|
|
|
return devices.growFS(info)
|
|
}
|
|
|
|
func (devices *DeviceSet) growFS(info *devInfo) error {
|
|
if err := devices.activateDeviceIfNeeded(info, false); err != nil {
|
|
return fmt.Errorf("Error activating devmapper device: %s", err)
|
|
}
|
|
|
|
defer devices.deactivateDevice(info)
|
|
|
|
fsMountPoint := "/run/docker/mnt"
|
|
if _, err := os.Stat(fsMountPoint); os.IsNotExist(err) {
|
|
if err := os.MkdirAll(fsMountPoint, 0700); err != nil {
|
|
return err
|
|
}
|
|
defer os.RemoveAll(fsMountPoint)
|
|
}
|
|
|
|
options := ""
|
|
if devices.BaseDeviceFilesystem == "xfs" {
|
|
// XFS needs nouuid or it can't mount filesystems with the same fs
|
|
options = joinMountOptions(options, "nouuid")
|
|
}
|
|
options = joinMountOptions(options, devices.mountOptions)
|
|
|
|
if err := mount.Mount(info.DevName(), fsMountPoint, devices.BaseDeviceFilesystem, options); err != nil {
|
|
return fmt.Errorf("Error mounting '%s' on '%s': %s", info.DevName(), fsMountPoint, err)
|
|
}
|
|
|
|
defer syscall.Unmount(fsMountPoint, syscall.MNT_DETACH)
|
|
|
|
switch devices.BaseDeviceFilesystem {
|
|
case "ext4":
|
|
if out, err := exec.Command("resize2fs", info.DevName()).CombinedOutput(); err != nil {
|
|
return fmt.Errorf("Failed to grow rootfs:%v:%s", err, string(out))
|
|
}
|
|
case "xfs":
|
|
if out, err := exec.Command("xfs_growfs", info.DevName()).CombinedOutput(); err != nil {
|
|
return fmt.Errorf("Failed to grow rootfs:%v:%s", err, string(out))
|
|
}
|
|
default:
|
|
return fmt.Errorf("Unsupported filesystem type %s", devices.BaseDeviceFilesystem)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (devices *DeviceSet) setupBaseImage() error {
|
|
oldInfo, _ := devices.lookupDeviceWithLock("")
|
|
|
|
// base image already exists. If it is initialized properly, do UUID
|
|
// verification and return. Otherwise remove image and set it up
|
|
// fresh.
|
|
|
|
if oldInfo != nil {
|
|
if oldInfo.Initialized && !oldInfo.Deleted {
|
|
if err := devices.setupVerifyBaseImageUUIDFS(oldInfo); err != nil {
|
|
return err
|
|
}
|
|
|
|
if err := devices.checkGrowBaseDeviceFS(oldInfo); err != nil {
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
logrus.Debugf("devmapper: Removing uninitialized base image")
|
|
// If previous base device is in deferred delete state,
|
|
// that needs to be cleaned up first. So don't try
|
|
// deferred deletion.
|
|
if err := devices.DeleteDevice("", true); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
// If we are setting up base image for the first time, make sure
|
|
// thin pool is empty.
|
|
if devices.thinPoolDevice != "" && oldInfo == nil {
|
|
if err := devices.checkThinPool(); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
// Create new base image device
|
|
if err := devices.createBaseImage(); err != nil {
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func setCloseOnExec(name string) {
|
|
if fileInfos, _ := ioutil.ReadDir("/proc/self/fd"); fileInfos != nil {
|
|
for _, i := range fileInfos {
|
|
link, _ := os.Readlink(filepath.Join("/proc/self/fd", i.Name()))
|
|
if link == name {
|
|
fd, err := strconv.Atoi(i.Name())
|
|
if err == nil {
|
|
syscall.CloseOnExec(fd)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// DMLog implements logging using DevMapperLogger interface.
|
|
func (devices *DeviceSet) DMLog(level int, file string, line int, dmError int, message string) {
|
|
// By default libdm sends us all the messages including debug ones.
|
|
// We need to filter out messages here and figure out which one
|
|
// should be printed.
|
|
if level > logLevel {
|
|
return
|
|
}
|
|
|
|
// FIXME(vbatts) push this back into ./pkg/devicemapper/
|
|
if level <= devicemapper.LogLevelErr {
|
|
logrus.Errorf("libdevmapper(%d): %s:%d (%d) %s", level, file, line, dmError, message)
|
|
} else if level <= devicemapper.LogLevelInfo {
|
|
logrus.Infof("libdevmapper(%d): %s:%d (%d) %s", level, file, line, dmError, message)
|
|
} else {
|
|
// FIXME(vbatts) push this back into ./pkg/devicemapper/
|
|
logrus.Debugf("libdevmapper(%d): %s:%d (%d) %s", level, file, line, dmError, message)
|
|
}
|
|
}
|
|
|
|
func major(device uint64) uint64 {
|
|
return (device >> 8) & 0xfff
|
|
}
|
|
|
|
func minor(device uint64) uint64 {
|
|
return (device & 0xff) | ((device >> 12) & 0xfff00)
|
|
}
|
|
|
|
// ResizePool increases the size of the pool.
|
|
func (devices *DeviceSet) ResizePool(size int64) error {
|
|
dirname := devices.loopbackDir()
|
|
datafilename := path.Join(dirname, "data")
|
|
if len(devices.dataDevice) > 0 {
|
|
datafilename = devices.dataDevice
|
|
}
|
|
metadatafilename := path.Join(dirname, "metadata")
|
|
if len(devices.metadataDevice) > 0 {
|
|
metadatafilename = devices.metadataDevice
|
|
}
|
|
|
|
datafile, err := os.OpenFile(datafilename, os.O_RDWR, 0)
|
|
if datafile == nil {
|
|
return err
|
|
}
|
|
defer datafile.Close()
|
|
|
|
fi, err := datafile.Stat()
|
|
if fi == nil {
|
|
return err
|
|
}
|
|
|
|
if fi.Size() > size {
|
|
return fmt.Errorf("devmapper: Can't shrink file")
|
|
}
|
|
|
|
dataloopback := loopback.FindLoopDeviceFor(datafile)
|
|
if dataloopback == nil {
|
|
return fmt.Errorf("devmapper: Unable to find loopback mount for: %s", datafilename)
|
|
}
|
|
defer dataloopback.Close()
|
|
|
|
metadatafile, err := os.OpenFile(metadatafilename, os.O_RDWR, 0)
|
|
if metadatafile == nil {
|
|
return err
|
|
}
|
|
defer metadatafile.Close()
|
|
|
|
metadataloopback := loopback.FindLoopDeviceFor(metadatafile)
|
|
if metadataloopback == nil {
|
|
return fmt.Errorf("devmapper: Unable to find loopback mount for: %s", metadatafilename)
|
|
}
|
|
defer metadataloopback.Close()
|
|
|
|
// Grow loopback file
|
|
if err := datafile.Truncate(size); err != nil {
|
|
return fmt.Errorf("devmapper: Unable to grow loopback file: %s", err)
|
|
}
|
|
|
|
// Reload size for loopback device
|
|
if err := loopback.SetCapacity(dataloopback); err != nil {
|
|
return fmt.Errorf("Unable to update loopback capacity: %s", err)
|
|
}
|
|
|
|
// Suspend the pool
|
|
if err := devicemapper.SuspendDevice(devices.getPoolName()); err != nil {
|
|
return fmt.Errorf("devmapper: Unable to suspend pool: %s", err)
|
|
}
|
|
|
|
// Reload with the new block sizes
|
|
if err := devicemapper.ReloadPool(devices.getPoolName(), dataloopback, metadataloopback, devices.thinpBlockSize); err != nil {
|
|
return fmt.Errorf("devmapper: Unable to reload pool: %s", err)
|
|
}
|
|
|
|
// Resume the pool
|
|
if err := devicemapper.ResumeDevice(devices.getPoolName()); err != nil {
|
|
return fmt.Errorf("devmapper: Unable to resume pool: %s", err)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (devices *DeviceSet) loadTransactionMetaData() error {
|
|
jsonData, err := ioutil.ReadFile(devices.transactionMetaFile())
|
|
if err != nil {
|
|
// There is no active transaction. This will be the case
|
|
// during upgrade.
|
|
if os.IsNotExist(err) {
|
|
devices.OpenTransactionID = devices.TransactionID
|
|
return nil
|
|
}
|
|
return err
|
|
}
|
|
|
|
json.Unmarshal(jsonData, &devices.transaction)
|
|
return nil
|
|
}
|
|
|
|
func (devices *DeviceSet) saveTransactionMetaData() error {
|
|
jsonData, err := json.Marshal(&devices.transaction)
|
|
if err != nil {
|
|
return fmt.Errorf("devmapper: Error encoding metadata to json: %s", err)
|
|
}
|
|
|
|
return devices.writeMetaFile(jsonData, devices.transactionMetaFile())
|
|
}
|
|
|
|
func (devices *DeviceSet) removeTransactionMetaData() error {
|
|
if err := os.RemoveAll(devices.transactionMetaFile()); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (devices *DeviceSet) rollbackTransaction() error {
|
|
logrus.Debugf("devmapper: Rolling back open transaction: TransactionID=%d hash=%s device_id=%d", devices.OpenTransactionID, devices.DeviceIDHash, devices.DeviceID)
|
|
|
|
// A device id might have already been deleted before transaction
|
|
// closed. In that case this call will fail. Just leave a message
|
|
// in case of failure.
|
|
if err := devicemapper.DeleteDevice(devices.getPoolDevName(), devices.DeviceID); err != nil {
|
|
logrus.Errorf("devmapper: Unable to delete device: %s", err)
|
|
}
|
|
|
|
dinfo := &devInfo{Hash: devices.DeviceIDHash}
|
|
if err := devices.removeMetadata(dinfo); err != nil {
|
|
logrus.Errorf("devmapper: Unable to remove metadata: %s", err)
|
|
} else {
|
|
devices.markDeviceIDFree(devices.DeviceID)
|
|
}
|
|
|
|
if err := devices.removeTransactionMetaData(); err != nil {
|
|
logrus.Errorf("devmapper: Unable to remove transaction meta file %s: %s", devices.transactionMetaFile(), err)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (devices *DeviceSet) processPendingTransaction() error {
|
|
if err := devices.loadTransactionMetaData(); err != nil {
|
|
return err
|
|
}
|
|
|
|
// If there was open transaction but pool transaction ID is same
|
|
// as open transaction ID, nothing to roll back.
|
|
if devices.TransactionID == devices.OpenTransactionID {
|
|
return nil
|
|
}
|
|
|
|
// If open transaction ID is less than pool transaction ID, something
|
|
// is wrong. Bail out.
|
|
if devices.OpenTransactionID < devices.TransactionID {
|
|
logrus.Errorf("devmapper: Open Transaction id %d is less than pool transaction id %d", devices.OpenTransactionID, devices.TransactionID)
|
|
return nil
|
|
}
|
|
|
|
// Pool transaction ID is not same as open transaction. There is
|
|
// a transaction which was not completed.
|
|
if err := devices.rollbackTransaction(); err != nil {
|
|
return fmt.Errorf("devmapper: Rolling back open transaction failed: %s", err)
|
|
}
|
|
|
|
devices.OpenTransactionID = devices.TransactionID
|
|
return nil
|
|
}
|
|
|
|
func (devices *DeviceSet) loadDeviceSetMetaData() error {
|
|
jsonData, err := ioutil.ReadFile(devices.deviceSetMetaFile())
|
|
if err != nil {
|
|
// For backward compatibility return success if file does
|
|
// not exist.
|
|
if os.IsNotExist(err) {
|
|
return nil
|
|
}
|
|
return err
|
|
}
|
|
|
|
return json.Unmarshal(jsonData, devices)
|
|
}
|
|
|
|
func (devices *DeviceSet) saveDeviceSetMetaData() error {
|
|
jsonData, err := json.Marshal(devices)
|
|
if err != nil {
|
|
return fmt.Errorf("devmapper: Error encoding metadata to json: %s", err)
|
|
}
|
|
|
|
return devices.writeMetaFile(jsonData, devices.deviceSetMetaFile())
|
|
}
|
|
|
|
func (devices *DeviceSet) openTransaction(hash string, DeviceID int) error {
|
|
devices.allocateTransactionID()
|
|
devices.DeviceIDHash = hash
|
|
devices.DeviceID = DeviceID
|
|
if err := devices.saveTransactionMetaData(); err != nil {
|
|
return fmt.Errorf("devmapper: Error saving transaction metadata: %s", err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (devices *DeviceSet) refreshTransaction(DeviceID int) error {
|
|
devices.DeviceID = DeviceID
|
|
if err := devices.saveTransactionMetaData(); err != nil {
|
|
return fmt.Errorf("devmapper: Error saving transaction metadata: %s", err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (devices *DeviceSet) closeTransaction() error {
|
|
if err := devices.updatePoolTransactionID(); err != nil {
|
|
logrus.Debugf("devmapper: Failed to close Transaction")
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func determineDriverCapabilities(version string) error {
|
|
/*
|
|
* Driver version 4.27.0 and greater support deferred activation
|
|
* feature.
|
|
*/
|
|
|
|
logrus.Debugf("devicemapper: driver version is %s", version)
|
|
|
|
versionSplit := strings.Split(version, ".")
|
|
major, err := strconv.Atoi(versionSplit[0])
|
|
if err != nil {
|
|
return graphdriver.ErrNotSupported
|
|
}
|
|
|
|
if major > 4 {
|
|
driverDeferredRemovalSupport = true
|
|
return nil
|
|
}
|
|
|
|
if major < 4 {
|
|
return nil
|
|
}
|
|
|
|
minor, err := strconv.Atoi(versionSplit[1])
|
|
if err != nil {
|
|
return graphdriver.ErrNotSupported
|
|
}
|
|
|
|
/*
|
|
* If major is 4 and minor is 27, then there is no need to
|
|
* check for patch level as it can not be less than 0.
|
|
*/
|
|
if minor >= 27 {
|
|
driverDeferredRemovalSupport = true
|
|
return nil
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// Determine the major and minor number of loopback device
|
|
func getDeviceMajorMinor(file *os.File) (uint64, uint64, error) {
|
|
stat, err := file.Stat()
|
|
if err != nil {
|
|
return 0, 0, err
|
|
}
|
|
|
|
dev := stat.Sys().(*syscall.Stat_t).Rdev
|
|
majorNum := major(dev)
|
|
minorNum := minor(dev)
|
|
|
|
logrus.Debugf("devmapper: Major:Minor for device: %s is:%v:%v", file.Name(), majorNum, minorNum)
|
|
return majorNum, minorNum, nil
|
|
}
|
|
|
|
// Given a file which is backing file of a loop back device, find the
|
|
// loopback device name and its major/minor number.
|
|
func getLoopFileDeviceMajMin(filename string) (string, uint64, uint64, error) {
|
|
file, err := os.Open(filename)
|
|
if err != nil {
|
|
logrus.Debugf("devmapper: Failed to open file %s", filename)
|
|
return "", 0, 0, err
|
|
}
|
|
|
|
defer file.Close()
|
|
loopbackDevice := loopback.FindLoopDeviceFor(file)
|
|
if loopbackDevice == nil {
|
|
return "", 0, 0, fmt.Errorf("devmapper: Unable to find loopback mount for: %s", filename)
|
|
}
|
|
defer loopbackDevice.Close()
|
|
|
|
Major, Minor, err := getDeviceMajorMinor(loopbackDevice)
|
|
if err != nil {
|
|
return "", 0, 0, err
|
|
}
|
|
return loopbackDevice.Name(), Major, Minor, nil
|
|
}
|
|
|
|
// Get the major/minor numbers of thin pool data and metadata devices
|
|
func (devices *DeviceSet) getThinPoolDataMetaMajMin() (uint64, uint64, uint64, uint64, error) {
|
|
var params, poolDataMajMin, poolMetadataMajMin string
|
|
|
|
_, _, _, params, err := devicemapper.GetTable(devices.getPoolName())
|
|
if err != nil {
|
|
return 0, 0, 0, 0, err
|
|
}
|
|
|
|
if _, err = fmt.Sscanf(params, "%s %s", &poolMetadataMajMin, &poolDataMajMin); err != nil {
|
|
return 0, 0, 0, 0, err
|
|
}
|
|
|
|
logrus.Debugf("devmapper: poolDataMajMin=%s poolMetaMajMin=%s\n", poolDataMajMin, poolMetadataMajMin)
|
|
|
|
poolDataMajMinorSplit := strings.Split(poolDataMajMin, ":")
|
|
poolDataMajor, err := strconv.ParseUint(poolDataMajMinorSplit[0], 10, 32)
|
|
if err != nil {
|
|
return 0, 0, 0, 0, err
|
|
}
|
|
|
|
poolDataMinor, err := strconv.ParseUint(poolDataMajMinorSplit[1], 10, 32)
|
|
if err != nil {
|
|
return 0, 0, 0, 0, err
|
|
}
|
|
|
|
poolMetadataMajMinorSplit := strings.Split(poolMetadataMajMin, ":")
|
|
poolMetadataMajor, err := strconv.ParseUint(poolMetadataMajMinorSplit[0], 10, 32)
|
|
if err != nil {
|
|
return 0, 0, 0, 0, err
|
|
}
|
|
|
|
poolMetadataMinor, err := strconv.ParseUint(poolMetadataMajMinorSplit[1], 10, 32)
|
|
if err != nil {
|
|
return 0, 0, 0, 0, err
|
|
}
|
|
|
|
return poolDataMajor, poolDataMinor, poolMetadataMajor, poolMetadataMinor, nil
|
|
}
|
|
|
|
func (devices *DeviceSet) loadThinPoolLoopBackInfo() error {
|
|
poolDataMajor, poolDataMinor, poolMetadataMajor, poolMetadataMinor, err := devices.getThinPoolDataMetaMajMin()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
dirname := devices.loopbackDir()
|
|
|
|
// data device has not been passed in. So there should be a data file
|
|
// which is being mounted as loop device.
|
|
if devices.dataDevice == "" {
|
|
datafilename := path.Join(dirname, "data")
|
|
dataLoopDevice, dataMajor, dataMinor, err := getLoopFileDeviceMajMin(datafilename)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Compare the two
|
|
if poolDataMajor == dataMajor && poolDataMinor == dataMinor {
|
|
devices.dataDevice = dataLoopDevice
|
|
devices.dataLoopFile = datafilename
|
|
}
|
|
|
|
}
|
|
|
|
// metadata device has not been passed in. So there should be a
|
|
// metadata file which is being mounted as loop device.
|
|
if devices.metadataDevice == "" {
|
|
metadatafilename := path.Join(dirname, "metadata")
|
|
metadataLoopDevice, metadataMajor, metadataMinor, err := getLoopFileDeviceMajMin(metadatafilename)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if poolMetadataMajor == metadataMajor && poolMetadataMinor == metadataMinor {
|
|
devices.metadataDevice = metadataLoopDevice
|
|
devices.metadataLoopFile = metadatafilename
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (devices *DeviceSet) initDevmapper(doInit bool) error {
|
|
// give ourselves to libdm as a log handler
|
|
devicemapper.LogInit(devices)
|
|
|
|
version, err := devicemapper.GetDriverVersion()
|
|
if err != nil {
|
|
// Can't even get driver version, assume not supported
|
|
return graphdriver.ErrNotSupported
|
|
}
|
|
|
|
if err := determineDriverCapabilities(version); err != nil {
|
|
return graphdriver.ErrNotSupported
|
|
}
|
|
|
|
// If user asked for deferred removal then check both libdm library
|
|
// and kernel driver support deferred removal otherwise error out.
|
|
if enableDeferredRemoval {
|
|
if !driverDeferredRemovalSupport {
|
|
return fmt.Errorf("devmapper: Deferred removal can not be enabled as kernel does not support it")
|
|
}
|
|
if !devicemapper.LibraryDeferredRemovalSupport {
|
|
return fmt.Errorf("devmapper: Deferred removal can not be enabled as libdm does not support it")
|
|
}
|
|
logrus.Debugf("devmapper: Deferred removal support enabled.")
|
|
devices.deferredRemove = true
|
|
}
|
|
|
|
if enableDeferredDeletion {
|
|
if !devices.deferredRemove {
|
|
return fmt.Errorf("devmapper: Deferred deletion can not be enabled as deferred removal is not enabled. Enable deferred removal using --storage-opt dm.use_deferred_removal=true parameter")
|
|
}
|
|
logrus.Debugf("devmapper: Deferred deletion support enabled.")
|
|
devices.deferredDelete = true
|
|
}
|
|
|
|
// https://github.com/docker/docker/issues/4036
|
|
if supported := devicemapper.UdevSetSyncSupport(true); !supported {
|
|
if dockerversion.IAmStatic == "true" {
|
|
logrus.Errorf("devmapper: Udev sync is not supported. This will lead to data loss and unexpected behavior. Install a dynamic binary to use devicemapper or select a different storage driver. For more information, see https://docs.docker.com/engine/reference/commandline/daemon/#daemon-storage-driver-option")
|
|
} else {
|
|
logrus.Errorf("devmapper: Udev sync is not supported. This will lead to data loss and unexpected behavior. Install a more recent version of libdevmapper or select a different storage driver. For more information, see https://docs.docker.com/engine/reference/commandline/daemon/#daemon-storage-driver-option")
|
|
}
|
|
|
|
if !devices.overrideUdevSyncCheck {
|
|
return graphdriver.ErrNotSupported
|
|
}
|
|
}
|
|
|
|
//create the root dir of the devmapper driver ownership to match this
|
|
//daemon's remapped root uid/gid so containers can start properly
|
|
uid, gid, err := idtools.GetRootUIDGID(devices.uidMaps, devices.gidMaps)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if err := idtools.MkdirAs(devices.root, 0700, uid, gid); err != nil && !os.IsExist(err) {
|
|
return err
|
|
}
|
|
if err := os.MkdirAll(devices.metadataDir(), 0700); err != nil && !os.IsExist(err) {
|
|
return err
|
|
}
|
|
|
|
// Set the device prefix from the device id and inode of the docker root dir
|
|
|
|
st, err := os.Stat(devices.root)
|
|
if err != nil {
|
|
return fmt.Errorf("devmapper: Error looking up dir %s: %s", devices.root, err)
|
|
}
|
|
sysSt := st.Sys().(*syscall.Stat_t)
|
|
// "reg-" stands for "regular file".
|
|
// In the future we might use "dev-" for "device file", etc.
|
|
// docker-maj,min[-inode] stands for:
|
|
// - Managed by docker
|
|
// - The target of this device is at major <maj> and minor <min>
|
|
// - If <inode> is defined, use that file inside the device as a loopback image. Otherwise use the device itself.
|
|
devices.devicePrefix = fmt.Sprintf("docker-%d:%d-%d", major(sysSt.Dev), minor(sysSt.Dev), sysSt.Ino)
|
|
logrus.Debugf("devmapper: Generated prefix: %s", devices.devicePrefix)
|
|
|
|
// Check for the existence of the thin-pool device
|
|
poolExists, err := devices.thinPoolExists(devices.getPoolName())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// It seems libdevmapper opens this without O_CLOEXEC, and go exec will not close files
|
|
// that are not Close-on-exec,
|
|
// 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 !poolExists && devices.thinPoolDevice == "" {
|
|
logrus.Debugf("devmapper: Pool doesn't exist. Creating it.")
|
|
|
|
var (
|
|
dataFile *os.File
|
|
metadataFile *os.File
|
|
)
|
|
|
|
if devices.dataDevice == "" {
|
|
// Make sure the sparse images exist in <root>/devicemapper/data
|
|
|
|
hasData := devices.hasImage("data")
|
|
|
|
if !doInit && !hasData {
|
|
return errors.New("Loopback data file not found")
|
|
}
|
|
|
|
if !hasData {
|
|
createdLoopback = true
|
|
}
|
|
|
|
data, err := devices.ensureImage("data", devices.dataLoopbackSize)
|
|
if err != nil {
|
|
logrus.Debugf("devmapper: Error device ensureImage (data): %s", err)
|
|
return err
|
|
}
|
|
|
|
dataFile, err = loopback.AttachLoopDevice(data)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
devices.dataLoopFile = data
|
|
devices.dataDevice = dataFile.Name()
|
|
} else {
|
|
dataFile, err = os.OpenFile(devices.dataDevice, os.O_RDWR, 0600)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
defer dataFile.Close()
|
|
|
|
if devices.metadataDevice == "" {
|
|
// Make sure the sparse images exist in <root>/devicemapper/metadata
|
|
|
|
hasMetadata := devices.hasImage("metadata")
|
|
|
|
if !doInit && !hasMetadata {
|
|
return errors.New("Loopback metadata file not found")
|
|
}
|
|
|
|
if !hasMetadata {
|
|
createdLoopback = true
|
|
}
|
|
|
|
metadata, err := devices.ensureImage("metadata", devices.metaDataLoopbackSize)
|
|
if err != nil {
|
|
logrus.Debugf("devmapper: Error device ensureImage (metadata): %s", err)
|
|
return err
|
|
}
|
|
|
|
metadataFile, err = loopback.AttachLoopDevice(metadata)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
devices.metadataLoopFile = metadata
|
|
devices.metadataDevice = metadataFile.Name()
|
|
} else {
|
|
metadataFile, err = os.OpenFile(devices.metadataDevice, os.O_RDWR, 0600)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
defer metadataFile.Close()
|
|
|
|
if err := devicemapper.CreatePool(devices.getPoolName(), dataFile, metadataFile, devices.thinpBlockSize); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
// Pool already exists and caller did not pass us a pool. That means
|
|
// we probably created pool earlier and could not remove it as some
|
|
// containers were still using it. Detect some of the properties of
|
|
// pool, like is it using loop devices.
|
|
if poolExists && devices.thinPoolDevice == "" {
|
|
if err := devices.loadThinPoolLoopBackInfo(); err != nil {
|
|
logrus.Debugf("devmapper: Failed to load thin pool loopback device information:%v", err)
|
|
return err
|
|
}
|
|
}
|
|
|
|
// If we didn't just create the data or metadata image, we need to
|
|
// load the transaction id and migrate old metadata
|
|
if !createdLoopback {
|
|
if err := devices.initMetaData(); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
if devices.thinPoolDevice == "" {
|
|
if devices.metadataLoopFile != "" || devices.dataLoopFile != "" {
|
|
logrus.Warnf("devmapper: Usage of loopback devices is strongly discouraged for production use. Please use `--storage-opt dm.thinpooldev` or use `man docker` to refer to dm.thinpooldev section.")
|
|
}
|
|
}
|
|
|
|
// Right now this loads only NextDeviceID. If there is more metadata
|
|
// down the line, we might have to move it earlier.
|
|
if err := devices.loadDeviceSetMetaData(); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Setup the base image
|
|
if doInit {
|
|
if err := devices.setupBaseImage(); err != nil {
|
|
logrus.Debugf("devmapper: Error device setupBaseImage: %s", err)
|
|
return err
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// AddDevice adds a device and registers in the hash.
|
|
func (devices *DeviceSet) AddDevice(hash, baseHash string, storageOpt map[string]string) error {
|
|
logrus.Debugf("devmapper: AddDevice(hash=%s basehash=%s)", hash, baseHash)
|
|
defer logrus.Debugf("devmapper: AddDevice(hash=%s basehash=%s) END", hash, baseHash)
|
|
|
|
// If a deleted device exists, return error.
|
|
baseInfo, err := devices.lookupDeviceWithLock(baseHash)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if baseInfo.Deleted {
|
|
return fmt.Errorf("devmapper: Base device %v has been marked for deferred deletion", baseInfo.Hash)
|
|
}
|
|
|
|
baseInfo.lock.Lock()
|
|
defer baseInfo.lock.Unlock()
|
|
|
|
devices.Lock()
|
|
defer devices.Unlock()
|
|
|
|
// Also include deleted devices in case hash of new device is
|
|
// same as one of the deleted devices.
|
|
if info, _ := devices.lookupDevice(hash); info != nil {
|
|
return fmt.Errorf("devmapper: device %s already exists. Deleted=%v", hash, info.Deleted)
|
|
}
|
|
|
|
size, err := devices.parseStorageOpt(storageOpt)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if size == 0 {
|
|
size = baseInfo.Size
|
|
}
|
|
|
|
if size < baseInfo.Size {
|
|
return fmt.Errorf("devmapper: Container size cannot be smaller than %s", units.HumanSize(float64(baseInfo.Size)))
|
|
}
|
|
|
|
if err := devices.createRegisterSnapDevice(hash, baseInfo, size); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Grow the container rootfs.
|
|
if size > 0 {
|
|
info, err := devices.lookupDevice(hash)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if err := devices.growFS(info); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (devices *DeviceSet) parseStorageOpt(storageOpt map[string]string) (uint64, error) {
|
|
|
|
// Read size to change the block device size per container.
|
|
for key, val := range storageOpt {
|
|
key := strings.ToLower(key)
|
|
switch key {
|
|
case "size":
|
|
size, err := units.RAMInBytes(val)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
return uint64(size), nil
|
|
default:
|
|
return 0, fmt.Errorf("Unknown option %s", key)
|
|
}
|
|
}
|
|
|
|
return 0, nil
|
|
}
|
|
|
|
func (devices *DeviceSet) markForDeferredDeletion(info *devInfo) error {
|
|
// If device is already in deleted state, there is nothing to be done.
|
|
if info.Deleted {
|
|
return nil
|
|
}
|
|
|
|
logrus.Debugf("devmapper: Marking device %s for deferred deletion.", info.Hash)
|
|
|
|
info.Deleted = true
|
|
|
|
// save device metadata to reflect deleted state.
|
|
if err := devices.saveMetadata(info); err != nil {
|
|
info.Deleted = false
|
|
return err
|
|
}
|
|
|
|
devices.nrDeletedDevices++
|
|
return nil
|
|
}
|
|
|
|
// Should be called with devices.Lock() held.
|
|
func (devices *DeviceSet) deleteTransaction(info *devInfo, syncDelete bool) error {
|
|
if err := devices.openTransaction(info.Hash, info.DeviceID); err != nil {
|
|
logrus.Debugf("devmapper: Error opening transaction hash = %s deviceId = %d", "", info.DeviceID)
|
|
return err
|
|
}
|
|
|
|
defer devices.closeTransaction()
|
|
|
|
err := devicemapper.DeleteDevice(devices.getPoolDevName(), info.DeviceID)
|
|
if err != nil {
|
|
// If syncDelete is true, we want to return error. If deferred
|
|
// deletion is not enabled, we return an error. If error is
|
|
// something other then EBUSY, return an error.
|
|
if syncDelete || !devices.deferredDelete || err != devicemapper.ErrBusy {
|
|
logrus.Debugf("devmapper: Error deleting device: %s", err)
|
|
return err
|
|
}
|
|
}
|
|
|
|
if err == nil {
|
|
if err := devices.unregisterDevice(info.DeviceID, info.Hash); err != nil {
|
|
return err
|
|
}
|
|
// If device was already in deferred delete state that means
|
|
// deletion was being tried again later. Reduce the deleted
|
|
// device count.
|
|
if info.Deleted {
|
|
devices.nrDeletedDevices--
|
|
}
|
|
devices.markDeviceIDFree(info.DeviceID)
|
|
} else {
|
|
if err := devices.markForDeferredDeletion(info); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// Issue discard only if device open count is zero.
|
|
func (devices *DeviceSet) issueDiscard(info *devInfo) error {
|
|
logrus.Debugf("devmapper: issueDiscard(device: %s). START", info.Hash)
|
|
defer logrus.Debugf("devmapper: issueDiscard(device: %s). END", info.Hash)
|
|
// This is a workaround for the kernel not discarding block so
|
|
// on the thin pool when we remove a thinp device, so we do it
|
|
// manually.
|
|
// Even if device is deferred deleted, activate it and issue
|
|
// discards.
|
|
if err := devices.activateDeviceIfNeeded(info, true); err != nil {
|
|
return err
|
|
}
|
|
|
|
devinfo, err := devicemapper.GetInfo(info.Name())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if devinfo.OpenCount != 0 {
|
|
logrus.Debugf("devmapper: Device: %s is in use. OpenCount=%d. Not issuing discards.", info.Hash, devinfo.OpenCount)
|
|
return nil
|
|
}
|
|
|
|
if err := devicemapper.BlockDeviceDiscard(info.DevName()); err != nil {
|
|
logrus.Debugf("devmapper: Error discarding block on device: %s (ignoring)", err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Should be called with devices.Lock() held.
|
|
func (devices *DeviceSet) deleteDevice(info *devInfo, syncDelete bool) error {
|
|
if devices.doBlkDiscard {
|
|
devices.issueDiscard(info)
|
|
}
|
|
|
|
// Try to deactivate device in case it is active.
|
|
if err := devices.deactivateDevice(info); err != nil {
|
|
logrus.Debugf("devmapper: Error deactivating device: %s", err)
|
|
return err
|
|
}
|
|
|
|
if err := devices.deleteTransaction(info, syncDelete); err != nil {
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// DeleteDevice will return success if device has been marked for deferred
|
|
// removal. If one wants to override that and want DeleteDevice() to fail if
|
|
// device was busy and could not be deleted, set syncDelete=true.
|
|
func (devices *DeviceSet) DeleteDevice(hash string, syncDelete bool) error {
|
|
logrus.Debugf("devmapper: DeleteDevice(hash=%v syncDelete=%v) START", hash, syncDelete)
|
|
defer logrus.Debugf("devmapper: DeleteDevice(hash=%v syncDelete=%v) END", hash, syncDelete)
|
|
info, err := devices.lookupDeviceWithLock(hash)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
info.lock.Lock()
|
|
defer info.lock.Unlock()
|
|
|
|
devices.Lock()
|
|
defer devices.Unlock()
|
|
|
|
return devices.deleteDevice(info, syncDelete)
|
|
}
|
|
|
|
func (devices *DeviceSet) deactivatePool() error {
|
|
logrus.Debugf("devmapper: deactivatePool()")
|
|
defer logrus.Debugf("devmapper: deactivatePool END")
|
|
devname := devices.getPoolDevName()
|
|
|
|
devinfo, err := devicemapper.GetInfo(devname)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if devinfo.Exists == 0 {
|
|
return nil
|
|
}
|
|
if err := devicemapper.RemoveDevice(devname); err != nil {
|
|
return err
|
|
}
|
|
|
|
if d, err := devicemapper.GetDeps(devname); err == nil {
|
|
logrus.Warnf("devmapper: device %s still has %d active dependents", devname, d.Count)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (devices *DeviceSet) deactivateDevice(info *devInfo) error {
|
|
logrus.Debugf("devmapper: deactivateDevice(%s)", info.Hash)
|
|
defer logrus.Debugf("devmapper: deactivateDevice END(%s)", info.Hash)
|
|
|
|
devinfo, err := devicemapper.GetInfo(info.Name())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if devinfo.Exists == 0 {
|
|
return nil
|
|
}
|
|
|
|
if devices.deferredRemove {
|
|
if err := devicemapper.RemoveDeviceDeferred(info.Name()); err != nil {
|
|
return err
|
|
}
|
|
} else {
|
|
if err := devices.removeDevice(info.Name()); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Issues the underlying dm remove operation.
|
|
func (devices *DeviceSet) removeDevice(devname string) error {
|
|
var err error
|
|
|
|
logrus.Debugf("devmapper: removeDevice START(%s)", devname)
|
|
defer logrus.Debugf("devmapper: removeDevice END(%s)", devname)
|
|
|
|
for i := 0; i < 200; i++ {
|
|
err = devicemapper.RemoveDevice(devname)
|
|
if err == nil {
|
|
break
|
|
}
|
|
if err != devicemapper.ErrBusy {
|
|
return err
|
|
}
|
|
|
|
// If we see EBUSY it may be a transient error,
|
|
// sleep a bit a retry a few times.
|
|
devices.Unlock()
|
|
time.Sleep(100 * time.Millisecond)
|
|
devices.Lock()
|
|
}
|
|
|
|
return err
|
|
}
|
|
|
|
func (devices *DeviceSet) cancelDeferredRemoval(info *devInfo) error {
|
|
if !devices.deferredRemove {
|
|
return nil
|
|
}
|
|
|
|
logrus.Debugf("devmapper: cancelDeferredRemoval START(%s)", info.Name())
|
|
defer logrus.Debugf("devmapper: cancelDeferredRemoval END(%s)", info.Name())
|
|
|
|
devinfo, err := devicemapper.GetInfoWithDeferred(info.Name())
|
|
|
|
if devinfo != nil && devinfo.DeferredRemove == 0 {
|
|
return nil
|
|
}
|
|
|
|
// Cancel deferred remove
|
|
for i := 0; i < 100; i++ {
|
|
err = devicemapper.CancelDeferredRemove(info.Name())
|
|
if err == nil {
|
|
break
|
|
}
|
|
|
|
if err == devicemapper.ErrEnxio {
|
|
// Device is probably already gone. Return success.
|
|
return nil
|
|
}
|
|
|
|
if err != devicemapper.ErrBusy {
|
|
return err
|
|
}
|
|
|
|
// If we see EBUSY it may be a transient error,
|
|
// sleep a bit a retry a few times.
|
|
devices.Unlock()
|
|
time.Sleep(100 * time.Millisecond)
|
|
devices.Lock()
|
|
}
|
|
return err
|
|
}
|
|
|
|
// Shutdown shuts down the device by unmounting the root.
|
|
func (devices *DeviceSet) Shutdown(home string) error {
|
|
logrus.Debugf("devmapper: [deviceset %s] Shutdown()", devices.devicePrefix)
|
|
logrus.Debugf("devmapper: Shutting down DeviceSet: %s", devices.root)
|
|
defer logrus.Debugf("devmapper: [deviceset %s] Shutdown() END", devices.devicePrefix)
|
|
|
|
// Stop deletion worker. This should start delivering new events to
|
|
// ticker channel. That means no new instance of cleanupDeletedDevice()
|
|
// will run after this call. If one instance is already running at
|
|
// the time of the call, it must be holding devices.Lock() and
|
|
// we will block on this lock till cleanup function exits.
|
|
devices.deletionWorkerTicker.Stop()
|
|
|
|
devices.Lock()
|
|
// Save DeviceSet Metadata first. Docker kills all threads if they
|
|
// don't finish in certain time. It is possible that Shutdown()
|
|
// routine does not finish in time as we loop trying to deactivate
|
|
// some devices while these are busy. In that case shutdown() routine
|
|
// will be killed and we will not get a chance to save deviceset
|
|
// metadata. Hence save this early before trying to deactivate devices.
|
|
devices.saveDeviceSetMetaData()
|
|
|
|
// ignore the error since it's just a best effort to not try to unmount something that's mounted
|
|
mounts, _ := mount.GetMounts()
|
|
mounted := make(map[string]bool, len(mounts))
|
|
for _, mnt := range mounts {
|
|
mounted[mnt.Mountpoint] = true
|
|
}
|
|
|
|
if err := filepath.Walk(path.Join(home, "mnt"), func(p string, info os.FileInfo, err error) error {
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if !info.IsDir() {
|
|
return nil
|
|
}
|
|
|
|
if mounted[p] {
|
|
// We use MNT_DETACH here in case it is still busy in some running
|
|
// container. This means it'll go away from the global scope directly,
|
|
// and the device will be released when that container dies.
|
|
if err := syscall.Unmount(p, syscall.MNT_DETACH); err != nil {
|
|
logrus.Debugf("devmapper: Shutdown unmounting %s, error: %s", p, err)
|
|
}
|
|
}
|
|
|
|
if devInfo, err := devices.lookupDevice(path.Base(p)); err != nil {
|
|
logrus.Debugf("devmapper: Shutdown lookup device %s, error: %s", path.Base(p), err)
|
|
} else {
|
|
if err := devices.deactivateDevice(devInfo); err != nil {
|
|
logrus.Debugf("devmapper: Shutdown deactivate %s , error: %s", devInfo.Hash, err)
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}); err != nil && !os.IsNotExist(err) {
|
|
devices.Unlock()
|
|
return err
|
|
}
|
|
|
|
devices.Unlock()
|
|
|
|
info, _ := devices.lookupDeviceWithLock("")
|
|
if info != nil {
|
|
info.lock.Lock()
|
|
devices.Lock()
|
|
if err := devices.deactivateDevice(info); err != nil {
|
|
logrus.Debugf("devmapper: Shutdown deactivate base , error: %s", err)
|
|
}
|
|
devices.Unlock()
|
|
info.lock.Unlock()
|
|
}
|
|
|
|
devices.Lock()
|
|
if devices.thinPoolDevice == "" {
|
|
if err := devices.deactivatePool(); err != nil {
|
|
logrus.Debugf("devmapper: Shutdown deactivate pool , error: %s", err)
|
|
}
|
|
}
|
|
devices.Unlock()
|
|
|
|
return nil
|
|
}
|
|
|
|
// MountDevice mounts the device if not already mounted.
|
|
func (devices *DeviceSet) MountDevice(hash, path, mountLabel string) error {
|
|
info, err := devices.lookupDeviceWithLock(hash)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if info.Deleted {
|
|
return fmt.Errorf("devmapper: Can't mount device %v as it has been marked for deferred deletion", info.Hash)
|
|
}
|
|
|
|
info.lock.Lock()
|
|
defer info.lock.Unlock()
|
|
|
|
devices.Lock()
|
|
defer devices.Unlock()
|
|
|
|
if err := devices.activateDeviceIfNeeded(info, false); err != nil {
|
|
return fmt.Errorf("devmapper: Error activating devmapper device for '%s': %s", hash, err)
|
|
}
|
|
|
|
fstype, err := ProbeFsType(info.DevName())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
options := ""
|
|
|
|
if fstype == "xfs" {
|
|
// XFS needs nouuid or it can't mount filesystems with the same fs
|
|
options = joinMountOptions(options, "nouuid")
|
|
}
|
|
|
|
options = joinMountOptions(options, devices.mountOptions)
|
|
options = joinMountOptions(options, label.FormatMountLabel("", mountLabel))
|
|
|
|
if err := mount.Mount(info.DevName(), path, fstype, options); err != nil {
|
|
return fmt.Errorf("devmapper: Error mounting '%s' on '%s': %s", info.DevName(), path, err)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// UnmountDevice unmounts the device and removes it from hash.
|
|
func (devices *DeviceSet) UnmountDevice(hash, mountPath string) error {
|
|
logrus.Debugf("devmapper: UnmountDevice(hash=%s)", hash)
|
|
defer logrus.Debugf("devmapper: UnmountDevice(hash=%s) END", hash)
|
|
|
|
info, err := devices.lookupDeviceWithLock(hash)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
info.lock.Lock()
|
|
defer info.lock.Unlock()
|
|
|
|
devices.Lock()
|
|
defer devices.Unlock()
|
|
|
|
logrus.Debugf("devmapper: Unmount(%s)", mountPath)
|
|
if err := syscall.Unmount(mountPath, syscall.MNT_DETACH); err != nil {
|
|
return err
|
|
}
|
|
logrus.Debugf("devmapper: Unmount done")
|
|
|
|
if err := devices.deactivateDevice(info); err != nil {
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// HasDevice returns true if the device metadata exists.
|
|
func (devices *DeviceSet) HasDevice(hash string) bool {
|
|
info, _ := devices.lookupDeviceWithLock(hash)
|
|
return info != nil
|
|
}
|
|
|
|
// List returns a list of device ids.
|
|
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 = devicemapper.GetStatus(devName)
|
|
if err != nil {
|
|
return
|
|
}
|
|
if _, err = fmt.Sscanf(params, "%d %d", &mappedSectors, &highestMappedSector); err == nil {
|
|
return
|
|
}
|
|
return
|
|
}
|
|
|
|
// GetDeviceStatus provides size, mapped sectors
|
|
func (devices *DeviceSet) GetDeviceStatus(hash string) (*DevStatus, error) {
|
|
info, err := devices.lookupDeviceWithLock(hash)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
info.lock.Lock()
|
|
defer info.lock.Unlock()
|
|
|
|
devices.Lock()
|
|
defer devices.Unlock()
|
|
|
|
status := &DevStatus{
|
|
DeviceID: info.DeviceID,
|
|
Size: info.Size,
|
|
TransactionID: info.TransactionID,
|
|
}
|
|
|
|
if err := devices.activateDeviceIfNeeded(info, false); err != nil {
|
|
return nil, fmt.Errorf("devmapper: Error activating devmapper device for '%s': %s", hash, err)
|
|
}
|
|
|
|
sizeInSectors, mappedSectors, highestMappedSector, err := devices.deviceStatus(info.DevName())
|
|
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
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 = devicemapper.GetStatus(devices.getPoolName()); err == nil {
|
|
_, err = fmt.Sscanf(params, "%d %d/%d %d/%d", &transactionID, &metadataUsed, &metadataTotal, &dataUsed, &dataTotal)
|
|
}
|
|
return
|
|
}
|
|
|
|
// DataDevicePath returns the path to the data storage for this deviceset,
|
|
// regardless of loopback or block device
|
|
func (devices *DeviceSet) DataDevicePath() string {
|
|
return devices.dataDevice
|
|
}
|
|
|
|
// MetadataDevicePath returns the path to the metadata storage for this deviceset,
|
|
// regardless of loopback or block device
|
|
func (devices *DeviceSet) MetadataDevicePath() string {
|
|
return devices.metadataDevice
|
|
}
|
|
|
|
func (devices *DeviceSet) getUnderlyingAvailableSpace(loopFile string) (uint64, error) {
|
|
buf := new(syscall.Statfs_t)
|
|
if err := syscall.Statfs(loopFile, buf); err != nil {
|
|
logrus.Warnf("devmapper: Couldn't stat loopfile filesystem %v: %v", loopFile, err)
|
|
return 0, err
|
|
}
|
|
return buf.Bfree * uint64(buf.Bsize), nil
|
|
}
|
|
|
|
func (devices *DeviceSet) isRealFile(loopFile string) (bool, error) {
|
|
if loopFile != "" {
|
|
fi, err := os.Stat(loopFile)
|
|
if err != nil {
|
|
logrus.Warnf("devmapper: Couldn't stat loopfile %v: %v", loopFile, err)
|
|
return false, err
|
|
}
|
|
return fi.Mode().IsRegular(), nil
|
|
}
|
|
return false, nil
|
|
}
|
|
|
|
// Status returns the current status of this deviceset
|
|
func (devices *DeviceSet) Status() *Status {
|
|
devices.Lock()
|
|
defer devices.Unlock()
|
|
|
|
status := &Status{}
|
|
|
|
status.PoolName = devices.getPoolName()
|
|
status.DataFile = devices.DataDevicePath()
|
|
status.DataLoopback = devices.dataLoopFile
|
|
status.MetadataFile = devices.MetadataDevicePath()
|
|
status.MetadataLoopback = devices.metadataLoopFile
|
|
status.UdevSyncSupported = devicemapper.UdevSyncSupported()
|
|
status.DeferredRemoveEnabled = devices.deferredRemove
|
|
status.DeferredDeleteEnabled = devices.deferredDelete
|
|
status.DeferredDeletedDeviceCount = devices.nrDeletedDevices
|
|
status.BaseDeviceSize = devices.getBaseDeviceSize()
|
|
status.BaseDeviceFS = devices.getBaseDeviceFS()
|
|
|
|
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
|
|
status.Data.Available = status.Data.Total - status.Data.Used
|
|
|
|
// metadata blocks are always 4k
|
|
status.Metadata.Used = metadataUsed * 4096
|
|
status.Metadata.Total = metadataTotal * 4096
|
|
status.Metadata.Available = status.Metadata.Total - status.Metadata.Used
|
|
|
|
status.SectorSize = blockSizeInSectors * 512
|
|
|
|
if check, _ := devices.isRealFile(devices.dataLoopFile); check {
|
|
actualSpace, err := devices.getUnderlyingAvailableSpace(devices.dataLoopFile)
|
|
if err == nil && actualSpace < status.Data.Available {
|
|
status.Data.Available = actualSpace
|
|
}
|
|
}
|
|
|
|
if check, _ := devices.isRealFile(devices.metadataLoopFile); check {
|
|
actualSpace, err := devices.getUnderlyingAvailableSpace(devices.metadataLoopFile)
|
|
if err == nil && actualSpace < status.Metadata.Available {
|
|
status.Metadata.Available = actualSpace
|
|
}
|
|
}
|
|
}
|
|
|
|
return status
|
|
}
|
|
|
|
// Status returns the current status of this deviceset
|
|
func (devices *DeviceSet) exportDeviceMetadata(hash string) (*deviceMetadata, error) {
|
|
info, err := devices.lookupDeviceWithLock(hash)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
info.lock.Lock()
|
|
defer info.lock.Unlock()
|
|
|
|
metadata := &deviceMetadata{info.DeviceID, info.Size, info.Name()}
|
|
return metadata, nil
|
|
}
|
|
|
|
// NewDeviceSet creates the device set based on the options provided.
|
|
func NewDeviceSet(root string, doInit bool, options []string, uidMaps, gidMaps []idtools.IDMap) (*DeviceSet, error) {
|
|
devicemapper.SetDevDir("/dev")
|
|
|
|
devices := &DeviceSet{
|
|
root: root,
|
|
metaData: metaData{Devices: make(map[string]*devInfo)},
|
|
dataLoopbackSize: defaultDataLoopbackSize,
|
|
metaDataLoopbackSize: defaultMetaDataLoopbackSize,
|
|
baseFsSize: defaultBaseFsSize,
|
|
overrideUdevSyncCheck: defaultUdevSyncOverride,
|
|
doBlkDiscard: true,
|
|
thinpBlockSize: defaultThinpBlockSize,
|
|
deviceIDMap: make([]byte, deviceIDMapSz),
|
|
deletionWorkerTicker: time.NewTicker(time.Second * 30),
|
|
uidMaps: uidMaps,
|
|
gidMaps: gidMaps,
|
|
minFreeSpacePercent: defaultMinFreeSpacePercent,
|
|
}
|
|
|
|
foundBlkDiscard := false
|
|
for _, option := range options {
|
|
key, val, err := parsers.ParseKeyValueOpt(option)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
key = strings.ToLower(key)
|
|
switch key {
|
|
case "dm.basesize":
|
|
size, err := units.RAMInBytes(val)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
userBaseSize = true
|
|
devices.baseFsSize = uint64(size)
|
|
case "dm.loopdatasize":
|
|
size, err := units.RAMInBytes(val)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
devices.dataLoopbackSize = size
|
|
case "dm.loopmetadatasize":
|
|
size, err := units.RAMInBytes(val)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
devices.metaDataLoopbackSize = size
|
|
case "dm.fs":
|
|
if val != "ext4" && val != "xfs" {
|
|
return nil, fmt.Errorf("devmapper: Unsupported filesystem %s\n", val)
|
|
}
|
|
devices.filesystem = val
|
|
case "dm.mkfsarg":
|
|
devices.mkfsArgs = append(devices.mkfsArgs, val)
|
|
case "dm.mountopt":
|
|
devices.mountOptions = joinMountOptions(devices.mountOptions, val)
|
|
case "dm.metadatadev":
|
|
devices.metadataDevice = val
|
|
case "dm.datadev":
|
|
devices.dataDevice = val
|
|
case "dm.thinpooldev":
|
|
devices.thinPoolDevice = strings.TrimPrefix(val, "/dev/mapper/")
|
|
case "dm.blkdiscard":
|
|
foundBlkDiscard = true
|
|
devices.doBlkDiscard, err = strconv.ParseBool(val)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
case "dm.blocksize":
|
|
size, err := units.RAMInBytes(val)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
// convert to 512b sectors
|
|
devices.thinpBlockSize = uint32(size) >> 9
|
|
case "dm.override_udev_sync_check":
|
|
devices.overrideUdevSyncCheck, err = strconv.ParseBool(val)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
case "dm.use_deferred_removal":
|
|
enableDeferredRemoval, err = strconv.ParseBool(val)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
case "dm.use_deferred_deletion":
|
|
enableDeferredDeletion, err = strconv.ParseBool(val)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
case "dm.min_free_space":
|
|
if !strings.HasSuffix(val, "%") {
|
|
return nil, fmt.Errorf("devmapper: Option dm.min_free_space requires %% suffix")
|
|
}
|
|
|
|
valstring := strings.TrimSuffix(val, "%")
|
|
minFreeSpacePercent, err := strconv.ParseUint(valstring, 10, 32)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if minFreeSpacePercent >= 100 {
|
|
return nil, fmt.Errorf("devmapper: Invalid value %v for option dm.min_free_space", val)
|
|
}
|
|
|
|
devices.minFreeSpacePercent = uint32(minFreeSpacePercent)
|
|
default:
|
|
return nil, fmt.Errorf("devmapper: Unknown option %s\n", key)
|
|
}
|
|
}
|
|
|
|
// By default, don't do blk discard hack on raw devices, its rarely useful and is expensive
|
|
if !foundBlkDiscard && (devices.dataDevice != "" || devices.thinPoolDevice != "") {
|
|
devices.doBlkDiscard = false
|
|
}
|
|
|
|
if err := devices.initDevmapper(doInit); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return devices, nil
|
|
}
|