deviceset.go 72 KB

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  1. // +build linux
  2. package devmapper
  3. import (
  4. "bufio"
  5. "encoding/json"
  6. "errors"
  7. "fmt"
  8. "io"
  9. "io/ioutil"
  10. "os"
  11. "os/exec"
  12. "path"
  13. "path/filepath"
  14. "strconv"
  15. "strings"
  16. "sync"
  17. "syscall"
  18. "time"
  19. "github.com/Sirupsen/logrus"
  20. "github.com/docker/docker/daemon/graphdriver"
  21. "github.com/docker/docker/pkg/devicemapper"
  22. "github.com/docker/docker/pkg/idtools"
  23. "github.com/docker/docker/pkg/loopback"
  24. "github.com/docker/docker/pkg/mount"
  25. "github.com/docker/docker/pkg/parsers"
  26. "github.com/docker/go-units"
  27. "github.com/opencontainers/runc/libcontainer/label"
  28. )
  29. var (
  30. defaultDataLoopbackSize int64 = 100 * 1024 * 1024 * 1024
  31. defaultMetaDataLoopbackSize int64 = 2 * 1024 * 1024 * 1024
  32. defaultBaseFsSize uint64 = 10 * 1024 * 1024 * 1024
  33. defaultThinpBlockSize uint32 = 128 // 64K = 128 512b sectors
  34. defaultUdevSyncOverride = false
  35. maxDeviceID = 0xffffff // 24 bit, pool limit
  36. deviceIDMapSz = (maxDeviceID + 1) / 8
  37. // We retry device removal so many a times that even error messages
  38. // will fill up console during normal operation. So only log Fatal
  39. // messages by default.
  40. logLevel = devicemapper.LogLevelFatal
  41. driverDeferredRemovalSupport = false
  42. enableDeferredRemoval = false
  43. enableDeferredDeletion = false
  44. userBaseSize = false
  45. )
  46. const deviceSetMetaFile string = "deviceset-metadata"
  47. const transactionMetaFile string = "transaction-metadata"
  48. type transaction struct {
  49. OpenTransactionID uint64 `json:"open_transaction_id"`
  50. DeviceIDHash string `json:"device_hash"`
  51. DeviceID int `json:"device_id"`
  52. }
  53. type devInfo struct {
  54. Hash string `json:"-"`
  55. DeviceID int `json:"device_id"`
  56. Size uint64 `json:"size"`
  57. TransactionID uint64 `json:"transaction_id"`
  58. Initialized bool `json:"initialized"`
  59. Deleted bool `json:"deleted"`
  60. devices *DeviceSet
  61. mountCount int
  62. mountPath string
  63. // The global DeviceSet lock guarantees that we serialize all
  64. // the calls to libdevmapper (which is not threadsafe), but we
  65. // sometimes release that lock while sleeping. In that case
  66. // this per-device lock is still held, protecting against
  67. // other accesses to the device that we're doing the wait on.
  68. //
  69. // WARNING: In order to avoid AB-BA deadlocks when releasing
  70. // the global lock while holding the per-device locks all
  71. // device locks must be acquired *before* the device lock, and
  72. // multiple device locks should be acquired parent before child.
  73. lock sync.Mutex
  74. }
  75. type metaData struct {
  76. Devices map[string]*devInfo `json:"Devices"`
  77. }
  78. // DeviceSet holds information about list of devices
  79. type DeviceSet struct {
  80. metaData `json:"-"`
  81. sync.Mutex `json:"-"` // Protects all fields of DeviceSet and serializes calls into libdevmapper
  82. root string
  83. devicePrefix string
  84. TransactionID uint64 `json:"-"`
  85. NextDeviceID int `json:"next_device_id"`
  86. deviceIDMap []byte
  87. // Options
  88. dataLoopbackSize int64
  89. metaDataLoopbackSize int64
  90. baseFsSize uint64
  91. filesystem string
  92. mountOptions string
  93. mkfsArgs []string
  94. dataDevice string // block or loop dev
  95. dataLoopFile string // loopback file, if used
  96. metadataDevice string // block or loop dev
  97. metadataLoopFile string // loopback file, if used
  98. doBlkDiscard bool
  99. thinpBlockSize uint32
  100. thinPoolDevice string
  101. transaction `json:"-"`
  102. overrideUdevSyncCheck bool
  103. deferredRemove bool // use deferred removal
  104. deferredDelete bool // use deferred deletion
  105. BaseDeviceUUID string // save UUID of base device
  106. BaseDeviceFilesystem string // save filesystem of base device
  107. nrDeletedDevices uint // number of deleted devices
  108. deletionWorkerTicker *time.Ticker
  109. uidMaps []idtools.IDMap
  110. gidMaps []idtools.IDMap
  111. }
  112. // DiskUsage contains information about disk usage and is used when reporting Status of a device.
  113. type DiskUsage struct {
  114. // Used bytes on the disk.
  115. Used uint64
  116. // Total bytes on the disk.
  117. Total uint64
  118. // Available bytes on the disk.
  119. Available uint64
  120. }
  121. // Status returns the information about the device.
  122. type Status struct {
  123. // PoolName is the name of the data pool.
  124. PoolName string
  125. // DataFile is the actual block device for data.
  126. DataFile string
  127. // DataLoopback loopback file, if used.
  128. DataLoopback string
  129. // MetadataFile is the actual block device for metadata.
  130. MetadataFile string
  131. // MetadataLoopback is the loopback file, if used.
  132. MetadataLoopback string
  133. // Data is the disk used for data.
  134. Data DiskUsage
  135. // Metadata is the disk used for meta data.
  136. Metadata DiskUsage
  137. // BaseDeviceSize is base size of container and image
  138. BaseDeviceSize uint64
  139. // BaseDeviceFS is backing filesystem.
  140. BaseDeviceFS string
  141. // SectorSize size of the vector.
  142. SectorSize uint64
  143. // UdevSyncSupported is true if sync is supported.
  144. UdevSyncSupported bool
  145. // DeferredRemoveEnabled is true then the device is not unmounted.
  146. DeferredRemoveEnabled bool
  147. // True if deferred deletion is enabled. This is different from
  148. // deferred removal. "removal" means that device mapper device is
  149. // deactivated. Thin device is still in thin pool and can be activated
  150. // again. But "deletion" means that thin device will be deleted from
  151. // thin pool and it can't be activated again.
  152. DeferredDeleteEnabled bool
  153. DeferredDeletedDeviceCount uint
  154. }
  155. // Structure used to export image/container metadata in docker inspect.
  156. type deviceMetadata struct {
  157. deviceID int
  158. deviceSize uint64 // size in bytes
  159. deviceName string // Device name as used during activation
  160. }
  161. // DevStatus returns information about device mounted containing its id, size and sector information.
  162. type DevStatus struct {
  163. // DeviceID is the id of the device.
  164. DeviceID int
  165. // Size is the size of the filesystem.
  166. Size uint64
  167. // TransactionID is a unique integer per device set used to identify an operation on the file system, this number is incremental.
  168. TransactionID uint64
  169. // SizeInSectors indicates the size of the sectors allocated.
  170. SizeInSectors uint64
  171. // MappedSectors indicates number of mapped sectors.
  172. MappedSectors uint64
  173. // HighestMappedSector is the pointer to the highest mapped sector.
  174. HighestMappedSector uint64
  175. }
  176. func getDevName(name string) string {
  177. return "/dev/mapper/" + name
  178. }
  179. func (info *devInfo) Name() string {
  180. hash := info.Hash
  181. if hash == "" {
  182. hash = "base"
  183. }
  184. return fmt.Sprintf("%s-%s", info.devices.devicePrefix, hash)
  185. }
  186. func (info *devInfo) DevName() string {
  187. return getDevName(info.Name())
  188. }
  189. func (devices *DeviceSet) loopbackDir() string {
  190. return path.Join(devices.root, "devicemapper")
  191. }
  192. func (devices *DeviceSet) metadataDir() string {
  193. return path.Join(devices.root, "metadata")
  194. }
  195. func (devices *DeviceSet) metadataFile(info *devInfo) string {
  196. file := info.Hash
  197. if file == "" {
  198. file = "base"
  199. }
  200. return path.Join(devices.metadataDir(), file)
  201. }
  202. func (devices *DeviceSet) transactionMetaFile() string {
  203. return path.Join(devices.metadataDir(), transactionMetaFile)
  204. }
  205. func (devices *DeviceSet) deviceSetMetaFile() string {
  206. return path.Join(devices.metadataDir(), deviceSetMetaFile)
  207. }
  208. func (devices *DeviceSet) oldMetadataFile() string {
  209. return path.Join(devices.loopbackDir(), "json")
  210. }
  211. func (devices *DeviceSet) getPoolName() string {
  212. if devices.thinPoolDevice == "" {
  213. return devices.devicePrefix + "-pool"
  214. }
  215. return devices.thinPoolDevice
  216. }
  217. func (devices *DeviceSet) getPoolDevName() string {
  218. return getDevName(devices.getPoolName())
  219. }
  220. func (devices *DeviceSet) hasImage(name string) bool {
  221. dirname := devices.loopbackDir()
  222. filename := path.Join(dirname, name)
  223. _, err := os.Stat(filename)
  224. return err == nil
  225. }
  226. // ensureImage creates a sparse file of <size> bytes at the path
  227. // <root>/devicemapper/<name>.
  228. // If the file already exists and new size is larger than its current size, it grows to the new size.
  229. // Either way it returns the full path.
  230. func (devices *DeviceSet) ensureImage(name string, size int64) (string, error) {
  231. dirname := devices.loopbackDir()
  232. filename := path.Join(dirname, name)
  233. uid, gid, err := idtools.GetRootUIDGID(devices.uidMaps, devices.gidMaps)
  234. if err != nil {
  235. return "", err
  236. }
  237. if err := idtools.MkdirAllAs(dirname, 0700, uid, gid); err != nil && !os.IsExist(err) {
  238. return "", err
  239. }
  240. if fi, err := os.Stat(filename); err != nil {
  241. if !os.IsNotExist(err) {
  242. return "", err
  243. }
  244. logrus.Debugf("devmapper: Creating loopback file %s for device-manage use", filename)
  245. file, err := os.OpenFile(filename, os.O_RDWR|os.O_CREATE, 0600)
  246. if err != nil {
  247. return "", err
  248. }
  249. defer file.Close()
  250. if err := file.Truncate(size); err != nil {
  251. return "", err
  252. }
  253. } else {
  254. if fi.Size() < size {
  255. file, err := os.OpenFile(filename, os.O_RDWR|os.O_CREATE, 0600)
  256. if err != nil {
  257. return "", err
  258. }
  259. defer file.Close()
  260. if err := file.Truncate(size); err != nil {
  261. return "", fmt.Errorf("devmapper: Unable to grow loopback file %s: %v", filename, err)
  262. }
  263. } else if fi.Size() > size {
  264. logrus.Warnf("devmapper: Can't shrink loopback file %s", filename)
  265. }
  266. }
  267. return filename, nil
  268. }
  269. func (devices *DeviceSet) allocateTransactionID() uint64 {
  270. devices.OpenTransactionID = devices.TransactionID + 1
  271. return devices.OpenTransactionID
  272. }
  273. func (devices *DeviceSet) updatePoolTransactionID() error {
  274. if err := devicemapper.SetTransactionID(devices.getPoolDevName(), devices.TransactionID, devices.OpenTransactionID); err != nil {
  275. return fmt.Errorf("devmapper: Error setting devmapper transaction ID: %s", err)
  276. }
  277. devices.TransactionID = devices.OpenTransactionID
  278. return nil
  279. }
  280. func (devices *DeviceSet) removeMetadata(info *devInfo) error {
  281. if err := os.RemoveAll(devices.metadataFile(info)); err != nil {
  282. return fmt.Errorf("devmapper: Error removing metadata file %s: %s", devices.metadataFile(info), err)
  283. }
  284. return nil
  285. }
  286. // Given json data and file path, write it to disk
  287. func (devices *DeviceSet) writeMetaFile(jsonData []byte, filePath string) error {
  288. tmpFile, err := ioutil.TempFile(devices.metadataDir(), ".tmp")
  289. if err != nil {
  290. return fmt.Errorf("devmapper: Error creating metadata file: %s", err)
  291. }
  292. n, err := tmpFile.Write(jsonData)
  293. if err != nil {
  294. return fmt.Errorf("devmapper: Error writing metadata to %s: %s", tmpFile.Name(), err)
  295. }
  296. if n < len(jsonData) {
  297. return io.ErrShortWrite
  298. }
  299. if err := tmpFile.Sync(); err != nil {
  300. return fmt.Errorf("devmapper: Error syncing metadata file %s: %s", tmpFile.Name(), err)
  301. }
  302. if err := tmpFile.Close(); err != nil {
  303. return fmt.Errorf("devmapper: Error closing metadata file %s: %s", tmpFile.Name(), err)
  304. }
  305. if err := os.Rename(tmpFile.Name(), filePath); err != nil {
  306. return fmt.Errorf("devmapper: Error committing metadata file %s: %s", tmpFile.Name(), err)
  307. }
  308. return nil
  309. }
  310. func (devices *DeviceSet) saveMetadata(info *devInfo) error {
  311. jsonData, err := json.Marshal(info)
  312. if err != nil {
  313. return fmt.Errorf("devmapper: Error encoding metadata to json: %s", err)
  314. }
  315. if err := devices.writeMetaFile(jsonData, devices.metadataFile(info)); err != nil {
  316. return err
  317. }
  318. return nil
  319. }
  320. func (devices *DeviceSet) markDeviceIDUsed(deviceID int) {
  321. var mask byte
  322. i := deviceID % 8
  323. mask = 1 << uint(i)
  324. devices.deviceIDMap[deviceID/8] = devices.deviceIDMap[deviceID/8] | mask
  325. }
  326. func (devices *DeviceSet) markDeviceIDFree(deviceID int) {
  327. var mask byte
  328. i := deviceID % 8
  329. mask = ^(1 << uint(i))
  330. devices.deviceIDMap[deviceID/8] = devices.deviceIDMap[deviceID/8] & mask
  331. }
  332. func (devices *DeviceSet) isDeviceIDFree(deviceID int) bool {
  333. var mask byte
  334. i := deviceID % 8
  335. mask = (1 << uint(i))
  336. if (devices.deviceIDMap[deviceID/8] & mask) != 0 {
  337. return false
  338. }
  339. return true
  340. }
  341. // Should be called with devices.Lock() held.
  342. func (devices *DeviceSet) lookupDevice(hash string) (*devInfo, error) {
  343. info := devices.Devices[hash]
  344. if info == nil {
  345. info = devices.loadMetadata(hash)
  346. if info == nil {
  347. return nil, fmt.Errorf("devmapper: Unknown device %s", hash)
  348. }
  349. devices.Devices[hash] = info
  350. }
  351. return info, nil
  352. }
  353. func (devices *DeviceSet) lookupDeviceWithLock(hash string) (*devInfo, error) {
  354. devices.Lock()
  355. defer devices.Unlock()
  356. info, err := devices.lookupDevice(hash)
  357. return info, err
  358. }
  359. // This function relies on that device hash map has been loaded in advance.
  360. // Should be called with devices.Lock() held.
  361. func (devices *DeviceSet) constructDeviceIDMap() {
  362. logrus.Debugf("devmapper: constructDeviceIDMap()")
  363. defer logrus.Debugf("devmapper: constructDeviceIDMap() END")
  364. for _, info := range devices.Devices {
  365. devices.markDeviceIDUsed(info.DeviceID)
  366. logrus.Debugf("devmapper: Added deviceId=%d to DeviceIdMap", info.DeviceID)
  367. }
  368. }
  369. func (devices *DeviceSet) deviceFileWalkFunction(path string, finfo os.FileInfo) error {
  370. // Skip some of the meta files which are not device files.
  371. if strings.HasSuffix(finfo.Name(), ".migrated") {
  372. logrus.Debugf("devmapper: Skipping file %s", path)
  373. return nil
  374. }
  375. if strings.HasPrefix(finfo.Name(), ".") {
  376. logrus.Debugf("devmapper: Skipping file %s", path)
  377. return nil
  378. }
  379. if finfo.Name() == deviceSetMetaFile {
  380. logrus.Debugf("devmapper: Skipping file %s", path)
  381. return nil
  382. }
  383. if finfo.Name() == transactionMetaFile {
  384. logrus.Debugf("devmapper: Skipping file %s", path)
  385. return nil
  386. }
  387. logrus.Debugf("devmapper: Loading data for file %s", path)
  388. hash := finfo.Name()
  389. if hash == "base" {
  390. hash = ""
  391. }
  392. // Include deleted devices also as cleanup delete device logic
  393. // will go through it and see if there are any deleted devices.
  394. if _, err := devices.lookupDevice(hash); err != nil {
  395. return fmt.Errorf("devmapper: Error looking up device %s:%v", hash, err)
  396. }
  397. return nil
  398. }
  399. func (devices *DeviceSet) loadDeviceFilesOnStart() error {
  400. logrus.Debugf("devmapper: loadDeviceFilesOnStart()")
  401. defer logrus.Debugf("devmapper: loadDeviceFilesOnStart() END")
  402. var scan = func(path string, info os.FileInfo, err error) error {
  403. if err != nil {
  404. logrus.Debugf("devmapper: Can't walk the file %s", path)
  405. return nil
  406. }
  407. // Skip any directories
  408. if info.IsDir() {
  409. return nil
  410. }
  411. return devices.deviceFileWalkFunction(path, info)
  412. }
  413. return filepath.Walk(devices.metadataDir(), scan)
  414. }
  415. // Should be called with devices.Lock() held.
  416. func (devices *DeviceSet) unregisterDevice(id int, hash string) error {
  417. logrus.Debugf("devmapper: unregisterDevice(%v, %v)", id, hash)
  418. info := &devInfo{
  419. Hash: hash,
  420. DeviceID: id,
  421. }
  422. delete(devices.Devices, hash)
  423. if err := devices.removeMetadata(info); err != nil {
  424. logrus.Debugf("devmapper: Error removing metadata: %s", err)
  425. return err
  426. }
  427. return nil
  428. }
  429. // Should be called with devices.Lock() held.
  430. func (devices *DeviceSet) registerDevice(id int, hash string, size uint64, transactionID uint64) (*devInfo, error) {
  431. logrus.Debugf("devmapper: registerDevice(%v, %v)", id, hash)
  432. info := &devInfo{
  433. Hash: hash,
  434. DeviceID: id,
  435. Size: size,
  436. TransactionID: transactionID,
  437. Initialized: false,
  438. devices: devices,
  439. }
  440. devices.Devices[hash] = info
  441. if err := devices.saveMetadata(info); err != nil {
  442. // Try to remove unused device
  443. delete(devices.Devices, hash)
  444. return nil, err
  445. }
  446. return info, nil
  447. }
  448. func (devices *DeviceSet) activateDeviceIfNeeded(info *devInfo, ignoreDeleted bool) error {
  449. logrus.Debugf("devmapper: activateDeviceIfNeeded(%v)", info.Hash)
  450. if info.Deleted && !ignoreDeleted {
  451. return fmt.Errorf("devmapper: Can't activate device %v as it is marked for deletion", info.Hash)
  452. }
  453. // Make sure deferred removal on device is canceled, if one was
  454. // scheduled.
  455. if err := devices.cancelDeferredRemoval(info); err != nil {
  456. return fmt.Errorf("devmapper: Device Deferred Removal Cancellation Failed: %s", err)
  457. }
  458. if devinfo, _ := devicemapper.GetInfo(info.Name()); devinfo != nil && devinfo.Exists != 0 {
  459. return nil
  460. }
  461. return devicemapper.ActivateDevice(devices.getPoolDevName(), info.Name(), info.DeviceID, info.Size)
  462. }
  463. // Return true only if kernel supports xfs and mkfs.xfs is available
  464. func xfsSupported() bool {
  465. // Make sure mkfs.xfs is available
  466. if _, err := exec.LookPath("mkfs.xfs"); err != nil {
  467. return false
  468. }
  469. // Check if kernel supports xfs filesystem or not.
  470. exec.Command("modprobe", "xfs").Run()
  471. f, err := os.Open("/proc/filesystems")
  472. if err != nil {
  473. logrus.Warnf("devmapper: Could not check if xfs is supported: %v", err)
  474. return false
  475. }
  476. defer f.Close()
  477. s := bufio.NewScanner(f)
  478. for s.Scan() {
  479. if strings.HasSuffix(s.Text(), "\txfs") {
  480. return true
  481. }
  482. }
  483. if err := s.Err(); err != nil {
  484. logrus.Warnf("devmapper: Could not check if xfs is supported: %v", err)
  485. }
  486. return false
  487. }
  488. func determineDefaultFS() string {
  489. if xfsSupported() {
  490. return "xfs"
  491. }
  492. logrus.Warn("devmapper: XFS is not supported in your system. Either the kernel doesnt support it or mkfs.xfs is not in your PATH. Defaulting to ext4 filesystem")
  493. return "ext4"
  494. }
  495. func (devices *DeviceSet) createFilesystem(info *devInfo) (err error) {
  496. devname := info.DevName()
  497. args := []string{}
  498. for _, arg := range devices.mkfsArgs {
  499. args = append(args, arg)
  500. }
  501. args = append(args, devname)
  502. if devices.filesystem == "" {
  503. devices.filesystem = determineDefaultFS()
  504. }
  505. if err := devices.saveBaseDeviceFilesystem(devices.filesystem); err != nil {
  506. return err
  507. }
  508. logrus.Infof("devmapper: Creating filesystem %s on device %s", devices.filesystem, info.Name())
  509. defer func() {
  510. if err != nil {
  511. logrus.Infof("devmapper: Error while creating filesystem %s on device %s: %v", devices.filesystem, info.Name(), err)
  512. } else {
  513. logrus.Infof("devmapper: Successfully created filesystem %s on device %s", devices.filesystem, info.Name())
  514. }
  515. }()
  516. switch devices.filesystem {
  517. case "xfs":
  518. err = exec.Command("mkfs.xfs", args...).Run()
  519. case "ext4":
  520. err = exec.Command("mkfs.ext4", append([]string{"-E", "nodiscard,lazy_itable_init=0,lazy_journal_init=0"}, args...)...).Run()
  521. if err != nil {
  522. err = exec.Command("mkfs.ext4", append([]string{"-E", "nodiscard,lazy_itable_init=0"}, args...)...).Run()
  523. }
  524. if err != nil {
  525. return err
  526. }
  527. err = exec.Command("tune2fs", append([]string{"-c", "-1", "-i", "0"}, devname)...).Run()
  528. default:
  529. err = fmt.Errorf("devmapper: Unsupported filesystem type %s", devices.filesystem)
  530. }
  531. return
  532. }
  533. func (devices *DeviceSet) migrateOldMetaData() error {
  534. // Migrate old metadata file
  535. jsonData, err := ioutil.ReadFile(devices.oldMetadataFile())
  536. if err != nil && !os.IsNotExist(err) {
  537. return err
  538. }
  539. if jsonData != nil {
  540. m := metaData{Devices: make(map[string]*devInfo)}
  541. if err := json.Unmarshal(jsonData, &m); err != nil {
  542. return err
  543. }
  544. for hash, info := range m.Devices {
  545. info.Hash = hash
  546. devices.saveMetadata(info)
  547. }
  548. if err := os.Rename(devices.oldMetadataFile(), devices.oldMetadataFile()+".migrated"); err != nil {
  549. return err
  550. }
  551. }
  552. return nil
  553. }
  554. // Cleanup deleted devices. It assumes that all the devices have been
  555. // loaded in the hash table.
  556. func (devices *DeviceSet) cleanupDeletedDevices() error {
  557. devices.Lock()
  558. // If there are no deleted devices, there is nothing to do.
  559. if devices.nrDeletedDevices == 0 {
  560. devices.Unlock()
  561. return nil
  562. }
  563. var deletedDevices []*devInfo
  564. for _, info := range devices.Devices {
  565. if !info.Deleted {
  566. continue
  567. }
  568. logrus.Debugf("devmapper: Found deleted device %s.", info.Hash)
  569. deletedDevices = append(deletedDevices, info)
  570. }
  571. // Delete the deleted devices. DeleteDevice() first takes the info lock
  572. // and then devices.Lock(). So drop it to avoid deadlock.
  573. devices.Unlock()
  574. for _, info := range deletedDevices {
  575. // This will again try deferred deletion.
  576. if err := devices.DeleteDevice(info.Hash, false); err != nil {
  577. logrus.Warnf("devmapper: Deletion of device %s, device_id=%v failed:%v", info.Hash, info.DeviceID, err)
  578. }
  579. }
  580. return nil
  581. }
  582. func (devices *DeviceSet) countDeletedDevices() {
  583. for _, info := range devices.Devices {
  584. if !info.Deleted {
  585. continue
  586. }
  587. devices.nrDeletedDevices++
  588. }
  589. }
  590. func (devices *DeviceSet) startDeviceDeletionWorker() {
  591. // Deferred deletion is not enabled. Don't do anything.
  592. if !devices.deferredDelete {
  593. return
  594. }
  595. logrus.Debugf("devmapper: Worker to cleanup deleted devices started")
  596. for range devices.deletionWorkerTicker.C {
  597. devices.cleanupDeletedDevices()
  598. }
  599. }
  600. func (devices *DeviceSet) initMetaData() error {
  601. devices.Lock()
  602. defer devices.Unlock()
  603. if err := devices.migrateOldMetaData(); err != nil {
  604. return err
  605. }
  606. _, transactionID, _, _, _, _, err := devices.poolStatus()
  607. if err != nil {
  608. return err
  609. }
  610. devices.TransactionID = transactionID
  611. if err := devices.loadDeviceFilesOnStart(); err != nil {
  612. return fmt.Errorf("devmapper: Failed to load device files:%v", err)
  613. }
  614. devices.constructDeviceIDMap()
  615. devices.countDeletedDevices()
  616. if err := devices.processPendingTransaction(); err != nil {
  617. return err
  618. }
  619. // Start a goroutine to cleanup Deleted Devices
  620. go devices.startDeviceDeletionWorker()
  621. return nil
  622. }
  623. func (devices *DeviceSet) incNextDeviceID() {
  624. // IDs are 24bit, so wrap around
  625. devices.NextDeviceID = (devices.NextDeviceID + 1) & maxDeviceID
  626. }
  627. func (devices *DeviceSet) getNextFreeDeviceID() (int, error) {
  628. devices.incNextDeviceID()
  629. for i := 0; i <= maxDeviceID; i++ {
  630. if devices.isDeviceIDFree(devices.NextDeviceID) {
  631. devices.markDeviceIDUsed(devices.NextDeviceID)
  632. return devices.NextDeviceID, nil
  633. }
  634. devices.incNextDeviceID()
  635. }
  636. return 0, fmt.Errorf("devmapper: Unable to find a free device ID")
  637. }
  638. func (devices *DeviceSet) createRegisterDevice(hash string) (*devInfo, error) {
  639. devices.Lock()
  640. defer devices.Unlock()
  641. deviceID, err := devices.getNextFreeDeviceID()
  642. if err != nil {
  643. return nil, err
  644. }
  645. if err := devices.openTransaction(hash, deviceID); err != nil {
  646. logrus.Debugf("devmapper: Error opening transaction hash = %s deviceID = %d", hash, deviceID)
  647. devices.markDeviceIDFree(deviceID)
  648. return nil, err
  649. }
  650. for {
  651. if err := devicemapper.CreateDevice(devices.getPoolDevName(), deviceID); err != nil {
  652. if devicemapper.DeviceIDExists(err) {
  653. // Device ID already exists. This should not
  654. // happen. Now we have a mechanism to find
  655. // a free device ID. So something is not right.
  656. // Give a warning and continue.
  657. logrus.Errorf("devmapper: Device ID %d exists in pool but it is supposed to be unused", deviceID)
  658. deviceID, err = devices.getNextFreeDeviceID()
  659. if err != nil {
  660. return nil, err
  661. }
  662. // Save new device id into transaction
  663. devices.refreshTransaction(deviceID)
  664. continue
  665. }
  666. logrus.Debugf("devmapper: Error creating device: %s", err)
  667. devices.markDeviceIDFree(deviceID)
  668. return nil, err
  669. }
  670. break
  671. }
  672. logrus.Debugf("devmapper: Registering device (id %v) with FS size %v", deviceID, devices.baseFsSize)
  673. info, err := devices.registerDevice(deviceID, hash, devices.baseFsSize, devices.OpenTransactionID)
  674. if err != nil {
  675. _ = devicemapper.DeleteDevice(devices.getPoolDevName(), deviceID)
  676. devices.markDeviceIDFree(deviceID)
  677. return nil, err
  678. }
  679. if err := devices.closeTransaction(); err != nil {
  680. devices.unregisterDevice(deviceID, hash)
  681. devicemapper.DeleteDevice(devices.getPoolDevName(), deviceID)
  682. devices.markDeviceIDFree(deviceID)
  683. return nil, err
  684. }
  685. return info, nil
  686. }
  687. func (devices *DeviceSet) createRegisterSnapDevice(hash string, baseInfo *devInfo) error {
  688. deviceID, err := devices.getNextFreeDeviceID()
  689. if err != nil {
  690. return err
  691. }
  692. if err := devices.openTransaction(hash, deviceID); err != nil {
  693. logrus.Debugf("devmapper: Error opening transaction hash = %s deviceID = %d", hash, deviceID)
  694. devices.markDeviceIDFree(deviceID)
  695. return err
  696. }
  697. for {
  698. if err := devicemapper.CreateSnapDevice(devices.getPoolDevName(), deviceID, baseInfo.Name(), baseInfo.DeviceID); err != nil {
  699. if devicemapper.DeviceIDExists(err) {
  700. // Device ID already exists. This should not
  701. // happen. Now we have a mechanism to find
  702. // a free device ID. So something is not right.
  703. // Give a warning and continue.
  704. logrus.Errorf("devmapper: Device ID %d exists in pool but it is supposed to be unused", deviceID)
  705. deviceID, err = devices.getNextFreeDeviceID()
  706. if err != nil {
  707. return err
  708. }
  709. // Save new device id into transaction
  710. devices.refreshTransaction(deviceID)
  711. continue
  712. }
  713. logrus.Debugf("devmapper: Error creating snap device: %s", err)
  714. devices.markDeviceIDFree(deviceID)
  715. return err
  716. }
  717. break
  718. }
  719. if _, err := devices.registerDevice(deviceID, hash, baseInfo.Size, devices.OpenTransactionID); err != nil {
  720. devicemapper.DeleteDevice(devices.getPoolDevName(), deviceID)
  721. devices.markDeviceIDFree(deviceID)
  722. logrus.Debugf("devmapper: Error registering device: %s", err)
  723. return err
  724. }
  725. if err := devices.closeTransaction(); err != nil {
  726. devices.unregisterDevice(deviceID, hash)
  727. devicemapper.DeleteDevice(devices.getPoolDevName(), deviceID)
  728. devices.markDeviceIDFree(deviceID)
  729. return err
  730. }
  731. return nil
  732. }
  733. func (devices *DeviceSet) loadMetadata(hash string) *devInfo {
  734. info := &devInfo{Hash: hash, devices: devices}
  735. jsonData, err := ioutil.ReadFile(devices.metadataFile(info))
  736. if err != nil {
  737. return nil
  738. }
  739. if err := json.Unmarshal(jsonData, &info); err != nil {
  740. return nil
  741. }
  742. if info.DeviceID > maxDeviceID {
  743. logrus.Errorf("devmapper: Ignoring Invalid DeviceId=%d", info.DeviceID)
  744. return nil
  745. }
  746. return info
  747. }
  748. func getDeviceUUID(device string) (string, error) {
  749. out, err := exec.Command("blkid", "-s", "UUID", "-o", "value", device).Output()
  750. if err != nil {
  751. return "", fmt.Errorf("devmapper: Failed to find uuid for device %s:%v", device, err)
  752. }
  753. uuid := strings.TrimSuffix(string(out), "\n")
  754. uuid = strings.TrimSpace(uuid)
  755. logrus.Debugf("devmapper: UUID for device: %s is:%s", device, uuid)
  756. return uuid, nil
  757. }
  758. func (devices *DeviceSet) getBaseDeviceSize() uint64 {
  759. info, _ := devices.lookupDevice("")
  760. if info == nil {
  761. return 0
  762. }
  763. return info.Size
  764. }
  765. func (devices *DeviceSet) getBaseDeviceFS() string {
  766. return devices.BaseDeviceFilesystem
  767. }
  768. func (devices *DeviceSet) verifyBaseDeviceUUIDFS(baseInfo *devInfo) error {
  769. devices.Lock()
  770. defer devices.Unlock()
  771. if err := devices.activateDeviceIfNeeded(baseInfo, false); err != nil {
  772. return err
  773. }
  774. defer devices.deactivateDevice(baseInfo)
  775. uuid, err := getDeviceUUID(baseInfo.DevName())
  776. if err != nil {
  777. return err
  778. }
  779. if devices.BaseDeviceUUID != uuid {
  780. 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)
  781. }
  782. if devices.BaseDeviceFilesystem == "" {
  783. fsType, err := ProbeFsType(baseInfo.DevName())
  784. if err != nil {
  785. return err
  786. }
  787. if err := devices.saveBaseDeviceFilesystem(fsType); err != nil {
  788. return err
  789. }
  790. }
  791. // If user specified a filesystem using dm.fs option and current
  792. // file system of base image is not same, warn user that dm.fs
  793. // will be ignored.
  794. if devices.BaseDeviceFilesystem != devices.filesystem {
  795. logrus.Warnf("devmapper: Base device already exists and has filesystem %s on it. User specified filesystem %s will be ignored.", devices.BaseDeviceFilesystem, devices.filesystem)
  796. devices.filesystem = devices.BaseDeviceFilesystem
  797. }
  798. return nil
  799. }
  800. func (devices *DeviceSet) saveBaseDeviceFilesystem(fs string) error {
  801. devices.BaseDeviceFilesystem = fs
  802. return devices.saveDeviceSetMetaData()
  803. }
  804. func (devices *DeviceSet) saveBaseDeviceUUID(baseInfo *devInfo) error {
  805. devices.Lock()
  806. defer devices.Unlock()
  807. if err := devices.activateDeviceIfNeeded(baseInfo, false); err != nil {
  808. return err
  809. }
  810. defer devices.deactivateDevice(baseInfo)
  811. uuid, err := getDeviceUUID(baseInfo.DevName())
  812. if err != nil {
  813. return err
  814. }
  815. devices.BaseDeviceUUID = uuid
  816. return devices.saveDeviceSetMetaData()
  817. }
  818. func (devices *DeviceSet) createBaseImage() error {
  819. logrus.Debugf("devmapper: Initializing base device-mapper thin volume")
  820. // Create initial device
  821. info, err := devices.createRegisterDevice("")
  822. if err != nil {
  823. return err
  824. }
  825. logrus.Debugf("devmapper: Creating filesystem on base device-mapper thin volume")
  826. if err := devices.activateDeviceIfNeeded(info, false); err != nil {
  827. return err
  828. }
  829. if err := devices.createFilesystem(info); err != nil {
  830. return err
  831. }
  832. info.Initialized = true
  833. if err := devices.saveMetadata(info); err != nil {
  834. info.Initialized = false
  835. return err
  836. }
  837. if err := devices.saveBaseDeviceUUID(info); err != nil {
  838. return fmt.Errorf("devmapper: Could not query and save base device UUID:%v", err)
  839. }
  840. return nil
  841. }
  842. // Returns if thin pool device exists or not. If device exists, also makes
  843. // sure it is a thin pool device and not some other type of device.
  844. func (devices *DeviceSet) thinPoolExists(thinPoolDevice string) (bool, error) {
  845. logrus.Debugf("devmapper: Checking for existence of the pool %s", thinPoolDevice)
  846. info, err := devicemapper.GetInfo(thinPoolDevice)
  847. if err != nil {
  848. return false, fmt.Errorf("devmapper: GetInfo() on device %s failed: %v", thinPoolDevice, err)
  849. }
  850. // Device does not exist.
  851. if info.Exists == 0 {
  852. return false, nil
  853. }
  854. _, _, deviceType, _, err := devicemapper.GetStatus(thinPoolDevice)
  855. if err != nil {
  856. return false, fmt.Errorf("devmapper: GetStatus() on device %s failed: %v", thinPoolDevice, err)
  857. }
  858. if deviceType != "thin-pool" {
  859. return false, fmt.Errorf("devmapper: Device %s is not a thin pool", thinPoolDevice)
  860. }
  861. return true, nil
  862. }
  863. func (devices *DeviceSet) checkThinPool() error {
  864. _, transactionID, dataUsed, _, _, _, err := devices.poolStatus()
  865. if err != nil {
  866. return err
  867. }
  868. if dataUsed != 0 {
  869. return fmt.Errorf("devmapper: Unable to take ownership of thin-pool (%s) that already has used data blocks",
  870. devices.thinPoolDevice)
  871. }
  872. if transactionID != 0 {
  873. return fmt.Errorf("devmapper: Unable to take ownership of thin-pool (%s) with non-zero transaction ID",
  874. devices.thinPoolDevice)
  875. }
  876. return nil
  877. }
  878. // Base image is initialized properly. Either save UUID for first time (for
  879. // upgrade case or verify UUID.
  880. func (devices *DeviceSet) setupVerifyBaseImageUUIDFS(baseInfo *devInfo) error {
  881. // If BaseDeviceUUID is nil (upgrade case), save it and return success.
  882. if devices.BaseDeviceUUID == "" {
  883. if err := devices.saveBaseDeviceUUID(baseInfo); err != nil {
  884. return fmt.Errorf("devmapper: Could not query and save base device UUID:%v", err)
  885. }
  886. return nil
  887. }
  888. if err := devices.verifyBaseDeviceUUIDFS(baseInfo); err != nil {
  889. return fmt.Errorf("devmapper: Base Device UUID and Filesystem verification failed.%v", err)
  890. }
  891. return nil
  892. }
  893. func (devices *DeviceSet) checkGrowBaseDeviceFS(info *devInfo) error {
  894. if !userBaseSize {
  895. return nil
  896. }
  897. if devices.baseFsSize < devices.getBaseDeviceSize() {
  898. return fmt.Errorf("devmapper: Base device size cannot be smaller than %s", units.HumanSize(float64(devices.getBaseDeviceSize())))
  899. }
  900. if devices.baseFsSize == devices.getBaseDeviceSize() {
  901. return nil
  902. }
  903. info.lock.Lock()
  904. defer info.lock.Unlock()
  905. devices.Lock()
  906. defer devices.Unlock()
  907. info.Size = devices.baseFsSize
  908. if err := devices.saveMetadata(info); err != nil {
  909. // Try to remove unused device
  910. delete(devices.Devices, info.Hash)
  911. return err
  912. }
  913. return devices.growFS(info)
  914. }
  915. func (devices *DeviceSet) growFS(info *devInfo) error {
  916. if err := devices.activateDeviceIfNeeded(info, false); err != nil {
  917. return fmt.Errorf("Error activating devmapper device: %s", err)
  918. }
  919. defer devices.deactivateDevice(info)
  920. fsMountPoint := "/run/docker/mnt"
  921. if _, err := os.Stat(fsMountPoint); os.IsNotExist(err) {
  922. if err := os.MkdirAll(fsMountPoint, 0700); err != nil {
  923. return err
  924. }
  925. defer os.RemoveAll(fsMountPoint)
  926. }
  927. options := ""
  928. if devices.BaseDeviceFilesystem == "xfs" {
  929. // XFS needs nouuid or it can't mount filesystems with the same fs
  930. options = joinMountOptions(options, "nouuid")
  931. }
  932. options = joinMountOptions(options, devices.mountOptions)
  933. if err := mount.Mount(info.DevName(), fsMountPoint, devices.BaseDeviceFilesystem, options); err != nil {
  934. return fmt.Errorf("Error mounting '%s' on '%s': %s", info.DevName(), fsMountPoint, err)
  935. }
  936. defer syscall.Unmount(fsMountPoint, syscall.MNT_DETACH)
  937. switch devices.BaseDeviceFilesystem {
  938. case "ext4":
  939. if out, err := exec.Command("resize2fs", info.DevName()).CombinedOutput(); err != nil {
  940. return fmt.Errorf("Failed to grow rootfs:%v:%s", err, string(out))
  941. }
  942. case "xfs":
  943. if out, err := exec.Command("xfs_growfs", info.DevName()).CombinedOutput(); err != nil {
  944. return fmt.Errorf("Failed to grow rootfs:%v:%s", err, string(out))
  945. }
  946. default:
  947. return fmt.Errorf("Unsupported filesystem type %s", devices.BaseDeviceFilesystem)
  948. }
  949. return nil
  950. }
  951. func (devices *DeviceSet) setupBaseImage() error {
  952. oldInfo, _ := devices.lookupDeviceWithLock("")
  953. // base image already exists. If it is initialized properly, do UUID
  954. // verification and return. Otherwise remove image and set it up
  955. // fresh.
  956. if oldInfo != nil {
  957. if oldInfo.Initialized && !oldInfo.Deleted {
  958. if err := devices.setupVerifyBaseImageUUIDFS(oldInfo); err != nil {
  959. return err
  960. }
  961. if err := devices.checkGrowBaseDeviceFS(oldInfo); err != nil {
  962. return err
  963. }
  964. return nil
  965. }
  966. logrus.Debugf("devmapper: Removing uninitialized base image")
  967. // If previous base device is in deferred delete state,
  968. // that needs to be cleaned up first. So don't try
  969. // deferred deletion.
  970. if err := devices.DeleteDevice("", true); err != nil {
  971. return err
  972. }
  973. }
  974. // If we are setting up base image for the first time, make sure
  975. // thin pool is empty.
  976. if devices.thinPoolDevice != "" && oldInfo == nil {
  977. if err := devices.checkThinPool(); err != nil {
  978. return err
  979. }
  980. }
  981. // Create new base image device
  982. if err := devices.createBaseImage(); err != nil {
  983. return err
  984. }
  985. return nil
  986. }
  987. func setCloseOnExec(name string) {
  988. if fileInfos, _ := ioutil.ReadDir("/proc/self/fd"); fileInfos != nil {
  989. for _, i := range fileInfos {
  990. link, _ := os.Readlink(filepath.Join("/proc/self/fd", i.Name()))
  991. if link == name {
  992. fd, err := strconv.Atoi(i.Name())
  993. if err == nil {
  994. syscall.CloseOnExec(fd)
  995. }
  996. }
  997. }
  998. }
  999. }
  1000. // DMLog implements logging using DevMapperLogger interface.
  1001. func (devices *DeviceSet) DMLog(level int, file string, line int, dmError int, message string) {
  1002. // By default libdm sends us all the messages including debug ones.
  1003. // We need to filter out messages here and figure out which one
  1004. // should be printed.
  1005. if level > logLevel {
  1006. return
  1007. }
  1008. // FIXME(vbatts) push this back into ./pkg/devicemapper/
  1009. if level <= devicemapper.LogLevelErr {
  1010. logrus.Errorf("libdevmapper(%d): %s:%d (%d) %s", level, file, line, dmError, message)
  1011. } else if level <= devicemapper.LogLevelInfo {
  1012. logrus.Infof("libdevmapper(%d): %s:%d (%d) %s", level, file, line, dmError, message)
  1013. } else {
  1014. // FIXME(vbatts) push this back into ./pkg/devicemapper/
  1015. logrus.Debugf("libdevmapper(%d): %s:%d (%d) %s", level, file, line, dmError, message)
  1016. }
  1017. }
  1018. func major(device uint64) uint64 {
  1019. return (device >> 8) & 0xfff
  1020. }
  1021. func minor(device uint64) uint64 {
  1022. return (device & 0xff) | ((device >> 12) & 0xfff00)
  1023. }
  1024. // ResizePool increases the size of the pool.
  1025. func (devices *DeviceSet) ResizePool(size int64) error {
  1026. dirname := devices.loopbackDir()
  1027. datafilename := path.Join(dirname, "data")
  1028. if len(devices.dataDevice) > 0 {
  1029. datafilename = devices.dataDevice
  1030. }
  1031. metadatafilename := path.Join(dirname, "metadata")
  1032. if len(devices.metadataDevice) > 0 {
  1033. metadatafilename = devices.metadataDevice
  1034. }
  1035. datafile, err := os.OpenFile(datafilename, os.O_RDWR, 0)
  1036. if datafile == nil {
  1037. return err
  1038. }
  1039. defer datafile.Close()
  1040. fi, err := datafile.Stat()
  1041. if fi == nil {
  1042. return err
  1043. }
  1044. if fi.Size() > size {
  1045. return fmt.Errorf("devmapper: Can't shrink file")
  1046. }
  1047. dataloopback := loopback.FindLoopDeviceFor(datafile)
  1048. if dataloopback == nil {
  1049. return fmt.Errorf("devmapper: Unable to find loopback mount for: %s", datafilename)
  1050. }
  1051. defer dataloopback.Close()
  1052. metadatafile, err := os.OpenFile(metadatafilename, os.O_RDWR, 0)
  1053. if metadatafile == nil {
  1054. return err
  1055. }
  1056. defer metadatafile.Close()
  1057. metadataloopback := loopback.FindLoopDeviceFor(metadatafile)
  1058. if metadataloopback == nil {
  1059. return fmt.Errorf("devmapper: Unable to find loopback mount for: %s", metadatafilename)
  1060. }
  1061. defer metadataloopback.Close()
  1062. // Grow loopback file
  1063. if err := datafile.Truncate(size); err != nil {
  1064. return fmt.Errorf("devmapper: Unable to grow loopback file: %s", err)
  1065. }
  1066. // Reload size for loopback device
  1067. if err := loopback.SetCapacity(dataloopback); err != nil {
  1068. return fmt.Errorf("Unable to update loopback capacity: %s", err)
  1069. }
  1070. // Suspend the pool
  1071. if err := devicemapper.SuspendDevice(devices.getPoolName()); err != nil {
  1072. return fmt.Errorf("devmapper: Unable to suspend pool: %s", err)
  1073. }
  1074. // Reload with the new block sizes
  1075. if err := devicemapper.ReloadPool(devices.getPoolName(), dataloopback, metadataloopback, devices.thinpBlockSize); err != nil {
  1076. return fmt.Errorf("devmapper: Unable to reload pool: %s", err)
  1077. }
  1078. // Resume the pool
  1079. if err := devicemapper.ResumeDevice(devices.getPoolName()); err != nil {
  1080. return fmt.Errorf("devmapper: Unable to resume pool: %s", err)
  1081. }
  1082. return nil
  1083. }
  1084. func (devices *DeviceSet) loadTransactionMetaData() error {
  1085. jsonData, err := ioutil.ReadFile(devices.transactionMetaFile())
  1086. if err != nil {
  1087. // There is no active transaction. This will be the case
  1088. // during upgrade.
  1089. if os.IsNotExist(err) {
  1090. devices.OpenTransactionID = devices.TransactionID
  1091. return nil
  1092. }
  1093. return err
  1094. }
  1095. json.Unmarshal(jsonData, &devices.transaction)
  1096. return nil
  1097. }
  1098. func (devices *DeviceSet) saveTransactionMetaData() error {
  1099. jsonData, err := json.Marshal(&devices.transaction)
  1100. if err != nil {
  1101. return fmt.Errorf("devmapper: Error encoding metadata to json: %s", err)
  1102. }
  1103. return devices.writeMetaFile(jsonData, devices.transactionMetaFile())
  1104. }
  1105. func (devices *DeviceSet) removeTransactionMetaData() error {
  1106. if err := os.RemoveAll(devices.transactionMetaFile()); err != nil {
  1107. return err
  1108. }
  1109. return nil
  1110. }
  1111. func (devices *DeviceSet) rollbackTransaction() error {
  1112. logrus.Debugf("devmapper: Rolling back open transaction: TransactionID=%d hash=%s device_id=%d", devices.OpenTransactionID, devices.DeviceIDHash, devices.DeviceID)
  1113. // A device id might have already been deleted before transaction
  1114. // closed. In that case this call will fail. Just leave a message
  1115. // in case of failure.
  1116. if err := devicemapper.DeleteDevice(devices.getPoolDevName(), devices.DeviceID); err != nil {
  1117. logrus.Errorf("devmapper: Unable to delete device: %s", err)
  1118. }
  1119. dinfo := &devInfo{Hash: devices.DeviceIDHash}
  1120. if err := devices.removeMetadata(dinfo); err != nil {
  1121. logrus.Errorf("devmapper: Unable to remove metadata: %s", err)
  1122. } else {
  1123. devices.markDeviceIDFree(devices.DeviceID)
  1124. }
  1125. if err := devices.removeTransactionMetaData(); err != nil {
  1126. logrus.Errorf("devmapper: Unable to remove transaction meta file %s: %s", devices.transactionMetaFile(), err)
  1127. }
  1128. return nil
  1129. }
  1130. func (devices *DeviceSet) processPendingTransaction() error {
  1131. if err := devices.loadTransactionMetaData(); err != nil {
  1132. return err
  1133. }
  1134. // If there was open transaction but pool transaction ID is same
  1135. // as open transaction ID, nothing to roll back.
  1136. if devices.TransactionID == devices.OpenTransactionID {
  1137. return nil
  1138. }
  1139. // If open transaction ID is less than pool transaction ID, something
  1140. // is wrong. Bail out.
  1141. if devices.OpenTransactionID < devices.TransactionID {
  1142. logrus.Errorf("devmapper: Open Transaction id %d is less than pool transaction id %d", devices.OpenTransactionID, devices.TransactionID)
  1143. return nil
  1144. }
  1145. // Pool transaction ID is not same as open transaction. There is
  1146. // a transaction which was not completed.
  1147. if err := devices.rollbackTransaction(); err != nil {
  1148. return fmt.Errorf("devmapper: Rolling back open transaction failed: %s", err)
  1149. }
  1150. devices.OpenTransactionID = devices.TransactionID
  1151. return nil
  1152. }
  1153. func (devices *DeviceSet) loadDeviceSetMetaData() error {
  1154. jsonData, err := ioutil.ReadFile(devices.deviceSetMetaFile())
  1155. if err != nil {
  1156. // For backward compatibility return success if file does
  1157. // not exist.
  1158. if os.IsNotExist(err) {
  1159. return nil
  1160. }
  1161. return err
  1162. }
  1163. return json.Unmarshal(jsonData, devices)
  1164. }
  1165. func (devices *DeviceSet) saveDeviceSetMetaData() error {
  1166. jsonData, err := json.Marshal(devices)
  1167. if err != nil {
  1168. return fmt.Errorf("devmapper: Error encoding metadata to json: %s", err)
  1169. }
  1170. return devices.writeMetaFile(jsonData, devices.deviceSetMetaFile())
  1171. }
  1172. func (devices *DeviceSet) openTransaction(hash string, DeviceID int) error {
  1173. devices.allocateTransactionID()
  1174. devices.DeviceIDHash = hash
  1175. devices.DeviceID = DeviceID
  1176. if err := devices.saveTransactionMetaData(); err != nil {
  1177. return fmt.Errorf("devmapper: Error saving transaction metadata: %s", err)
  1178. }
  1179. return nil
  1180. }
  1181. func (devices *DeviceSet) refreshTransaction(DeviceID int) error {
  1182. devices.DeviceID = DeviceID
  1183. if err := devices.saveTransactionMetaData(); err != nil {
  1184. return fmt.Errorf("devmapper: Error saving transaction metadata: %s", err)
  1185. }
  1186. return nil
  1187. }
  1188. func (devices *DeviceSet) closeTransaction() error {
  1189. if err := devices.updatePoolTransactionID(); err != nil {
  1190. logrus.Debugf("devmapper: Failed to close Transaction")
  1191. return err
  1192. }
  1193. return nil
  1194. }
  1195. func determineDriverCapabilities(version string) error {
  1196. /*
  1197. * Driver version 4.27.0 and greater support deferred activation
  1198. * feature.
  1199. */
  1200. logrus.Debugf("devicemapper: driver version is %s", version)
  1201. versionSplit := strings.Split(version, ".")
  1202. major, err := strconv.Atoi(versionSplit[0])
  1203. if err != nil {
  1204. return graphdriver.ErrNotSupported
  1205. }
  1206. if major > 4 {
  1207. driverDeferredRemovalSupport = true
  1208. return nil
  1209. }
  1210. if major < 4 {
  1211. return nil
  1212. }
  1213. minor, err := strconv.Atoi(versionSplit[1])
  1214. if err != nil {
  1215. return graphdriver.ErrNotSupported
  1216. }
  1217. /*
  1218. * If major is 4 and minor is 27, then there is no need to
  1219. * check for patch level as it can not be less than 0.
  1220. */
  1221. if minor >= 27 {
  1222. driverDeferredRemovalSupport = true
  1223. return nil
  1224. }
  1225. return nil
  1226. }
  1227. // Determine the major and minor number of loopback device
  1228. func getDeviceMajorMinor(file *os.File) (uint64, uint64, error) {
  1229. stat, err := file.Stat()
  1230. if err != nil {
  1231. return 0, 0, err
  1232. }
  1233. dev := stat.Sys().(*syscall.Stat_t).Rdev
  1234. majorNum := major(dev)
  1235. minorNum := minor(dev)
  1236. logrus.Debugf("devmapper: Major:Minor for device: %s is:%v:%v", file.Name(), majorNum, minorNum)
  1237. return majorNum, minorNum, nil
  1238. }
  1239. // Given a file which is backing file of a loop back device, find the
  1240. // loopback device name and its major/minor number.
  1241. func getLoopFileDeviceMajMin(filename string) (string, uint64, uint64, error) {
  1242. file, err := os.Open(filename)
  1243. if err != nil {
  1244. logrus.Debugf("devmapper: Failed to open file %s", filename)
  1245. return "", 0, 0, err
  1246. }
  1247. defer file.Close()
  1248. loopbackDevice := loopback.FindLoopDeviceFor(file)
  1249. if loopbackDevice == nil {
  1250. return "", 0, 0, fmt.Errorf("devmapper: Unable to find loopback mount for: %s", filename)
  1251. }
  1252. defer loopbackDevice.Close()
  1253. Major, Minor, err := getDeviceMajorMinor(loopbackDevice)
  1254. if err != nil {
  1255. return "", 0, 0, err
  1256. }
  1257. return loopbackDevice.Name(), Major, Minor, nil
  1258. }
  1259. // Get the major/minor numbers of thin pool data and metadata devices
  1260. func (devices *DeviceSet) getThinPoolDataMetaMajMin() (uint64, uint64, uint64, uint64, error) {
  1261. var params, poolDataMajMin, poolMetadataMajMin string
  1262. _, _, _, params, err := devicemapper.GetTable(devices.getPoolName())
  1263. if err != nil {
  1264. return 0, 0, 0, 0, err
  1265. }
  1266. if _, err = fmt.Sscanf(params, "%s %s", &poolMetadataMajMin, &poolDataMajMin); err != nil {
  1267. return 0, 0, 0, 0, err
  1268. }
  1269. logrus.Debugf("devmapper: poolDataMajMin=%s poolMetaMajMin=%s\n", poolDataMajMin, poolMetadataMajMin)
  1270. poolDataMajMinorSplit := strings.Split(poolDataMajMin, ":")
  1271. poolDataMajor, err := strconv.ParseUint(poolDataMajMinorSplit[0], 10, 32)
  1272. if err != nil {
  1273. return 0, 0, 0, 0, err
  1274. }
  1275. poolDataMinor, err := strconv.ParseUint(poolDataMajMinorSplit[1], 10, 32)
  1276. if err != nil {
  1277. return 0, 0, 0, 0, err
  1278. }
  1279. poolMetadataMajMinorSplit := strings.Split(poolMetadataMajMin, ":")
  1280. poolMetadataMajor, err := strconv.ParseUint(poolMetadataMajMinorSplit[0], 10, 32)
  1281. if err != nil {
  1282. return 0, 0, 0, 0, err
  1283. }
  1284. poolMetadataMinor, err := strconv.ParseUint(poolMetadataMajMinorSplit[1], 10, 32)
  1285. if err != nil {
  1286. return 0, 0, 0, 0, err
  1287. }
  1288. return poolDataMajor, poolDataMinor, poolMetadataMajor, poolMetadataMinor, nil
  1289. }
  1290. func (devices *DeviceSet) loadThinPoolLoopBackInfo() error {
  1291. poolDataMajor, poolDataMinor, poolMetadataMajor, poolMetadataMinor, err := devices.getThinPoolDataMetaMajMin()
  1292. if err != nil {
  1293. return err
  1294. }
  1295. dirname := devices.loopbackDir()
  1296. // data device has not been passed in. So there should be a data file
  1297. // which is being mounted as loop device.
  1298. if devices.dataDevice == "" {
  1299. datafilename := path.Join(dirname, "data")
  1300. dataLoopDevice, dataMajor, dataMinor, err := getLoopFileDeviceMajMin(datafilename)
  1301. if err != nil {
  1302. return err
  1303. }
  1304. // Compare the two
  1305. if poolDataMajor == dataMajor && poolDataMinor == dataMinor {
  1306. devices.dataDevice = dataLoopDevice
  1307. devices.dataLoopFile = datafilename
  1308. }
  1309. }
  1310. // metadata device has not been passed in. So there should be a
  1311. // metadata file which is being mounted as loop device.
  1312. if devices.metadataDevice == "" {
  1313. metadatafilename := path.Join(dirname, "metadata")
  1314. metadataLoopDevice, metadataMajor, metadataMinor, err := getLoopFileDeviceMajMin(metadatafilename)
  1315. if err != nil {
  1316. return err
  1317. }
  1318. if poolMetadataMajor == metadataMajor && poolMetadataMinor == metadataMinor {
  1319. devices.metadataDevice = metadataLoopDevice
  1320. devices.metadataLoopFile = metadatafilename
  1321. }
  1322. }
  1323. return nil
  1324. }
  1325. func (devices *DeviceSet) initDevmapper(doInit bool) error {
  1326. // give ourselves to libdm as a log handler
  1327. devicemapper.LogInit(devices)
  1328. version, err := devicemapper.GetDriverVersion()
  1329. if err != nil {
  1330. // Can't even get driver version, assume not supported
  1331. return graphdriver.ErrNotSupported
  1332. }
  1333. if err := determineDriverCapabilities(version); err != nil {
  1334. return graphdriver.ErrNotSupported
  1335. }
  1336. // If user asked for deferred removal then check both libdm library
  1337. // and kernel driver support deferred removal otherwise error out.
  1338. if enableDeferredRemoval {
  1339. if !driverDeferredRemovalSupport {
  1340. return fmt.Errorf("devmapper: Deferred removal can not be enabled as kernel does not support it")
  1341. }
  1342. if !devicemapper.LibraryDeferredRemovalSupport {
  1343. return fmt.Errorf("devmapper: Deferred removal can not be enabled as libdm does not support it")
  1344. }
  1345. logrus.Debugf("devmapper: Deferred removal support enabled.")
  1346. devices.deferredRemove = true
  1347. }
  1348. if enableDeferredDeletion {
  1349. if !devices.deferredRemove {
  1350. 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")
  1351. }
  1352. logrus.Debugf("devmapper: Deferred deletion support enabled.")
  1353. devices.deferredDelete = true
  1354. }
  1355. // https://github.com/docker/docker/issues/4036
  1356. if supported := devicemapper.UdevSetSyncSupport(true); !supported {
  1357. logrus.Warn("devmapper: Udev sync is not supported. This will lead to unexpected behavior, data loss and errors. For more information, see https://docs.docker.com/reference/commandline/daemon/#daemon-storage-driver-option")
  1358. }
  1359. //create the root dir of the devmapper driver ownership to match this
  1360. //daemon's remapped root uid/gid so containers can start properly
  1361. uid, gid, err := idtools.GetRootUIDGID(devices.uidMaps, devices.gidMaps)
  1362. if err != nil {
  1363. return err
  1364. }
  1365. if err := idtools.MkdirAs(devices.root, 0700, uid, gid); err != nil && !os.IsExist(err) {
  1366. return err
  1367. }
  1368. if err := os.MkdirAll(devices.metadataDir(), 0700); err != nil && !os.IsExist(err) {
  1369. return err
  1370. }
  1371. // Set the device prefix from the device id and inode of the docker root dir
  1372. st, err := os.Stat(devices.root)
  1373. if err != nil {
  1374. return fmt.Errorf("devmapper: Error looking up dir %s: %s", devices.root, err)
  1375. }
  1376. sysSt := st.Sys().(*syscall.Stat_t)
  1377. // "reg-" stands for "regular file".
  1378. // In the future we might use "dev-" for "device file", etc.
  1379. // docker-maj,min[-inode] stands for:
  1380. // - Managed by docker
  1381. // - The target of this device is at major <maj> and minor <min>
  1382. // - If <inode> is defined, use that file inside the device as a loopback image. Otherwise use the device itself.
  1383. devices.devicePrefix = fmt.Sprintf("docker-%d:%d-%d", major(sysSt.Dev), minor(sysSt.Dev), sysSt.Ino)
  1384. logrus.Debugf("devmapper: Generated prefix: %s", devices.devicePrefix)
  1385. // Check for the existence of the thin-pool device
  1386. poolExists, err := devices.thinPoolExists(devices.getPoolName())
  1387. if err != nil {
  1388. return err
  1389. }
  1390. // It seems libdevmapper opens this without O_CLOEXEC, and go exec will not close files
  1391. // that are not Close-on-exec,
  1392. // so we add this badhack to make sure it closes itself
  1393. setCloseOnExec("/dev/mapper/control")
  1394. // Make sure the sparse images exist in <root>/devicemapper/data and
  1395. // <root>/devicemapper/metadata
  1396. createdLoopback := false
  1397. // If the pool doesn't exist, create it
  1398. if !poolExists && devices.thinPoolDevice == "" {
  1399. logrus.Debugf("devmapper: Pool doesn't exist. Creating it.")
  1400. var (
  1401. dataFile *os.File
  1402. metadataFile *os.File
  1403. )
  1404. if devices.dataDevice == "" {
  1405. // Make sure the sparse images exist in <root>/devicemapper/data
  1406. hasData := devices.hasImage("data")
  1407. if !doInit && !hasData {
  1408. return errors.New("Loopback data file not found")
  1409. }
  1410. if !hasData {
  1411. createdLoopback = true
  1412. }
  1413. data, err := devices.ensureImage("data", devices.dataLoopbackSize)
  1414. if err != nil {
  1415. logrus.Debugf("devmapper: Error device ensureImage (data): %s", err)
  1416. return err
  1417. }
  1418. dataFile, err = loopback.AttachLoopDevice(data)
  1419. if err != nil {
  1420. return err
  1421. }
  1422. devices.dataLoopFile = data
  1423. devices.dataDevice = dataFile.Name()
  1424. } else {
  1425. dataFile, err = os.OpenFile(devices.dataDevice, os.O_RDWR, 0600)
  1426. if err != nil {
  1427. return err
  1428. }
  1429. }
  1430. defer dataFile.Close()
  1431. if devices.metadataDevice == "" {
  1432. // Make sure the sparse images exist in <root>/devicemapper/metadata
  1433. hasMetadata := devices.hasImage("metadata")
  1434. if !doInit && !hasMetadata {
  1435. return errors.New("Loopback metadata file not found")
  1436. }
  1437. if !hasMetadata {
  1438. createdLoopback = true
  1439. }
  1440. metadata, err := devices.ensureImage("metadata", devices.metaDataLoopbackSize)
  1441. if err != nil {
  1442. logrus.Debugf("devmapper: Error device ensureImage (metadata): %s", err)
  1443. return err
  1444. }
  1445. metadataFile, err = loopback.AttachLoopDevice(metadata)
  1446. if err != nil {
  1447. return err
  1448. }
  1449. devices.metadataLoopFile = metadata
  1450. devices.metadataDevice = metadataFile.Name()
  1451. } else {
  1452. metadataFile, err = os.OpenFile(devices.metadataDevice, os.O_RDWR, 0600)
  1453. if err != nil {
  1454. return err
  1455. }
  1456. }
  1457. defer metadataFile.Close()
  1458. if err := devicemapper.CreatePool(devices.getPoolName(), dataFile, metadataFile, devices.thinpBlockSize); err != nil {
  1459. return err
  1460. }
  1461. }
  1462. // Pool already exists and caller did not pass us a pool. That means
  1463. // we probably created pool earlier and could not remove it as some
  1464. // containers were still using it. Detect some of the properties of
  1465. // pool, like is it using loop devices.
  1466. if poolExists && devices.thinPoolDevice == "" {
  1467. if err := devices.loadThinPoolLoopBackInfo(); err != nil {
  1468. logrus.Debugf("devmapper: Failed to load thin pool loopback device information:%v", err)
  1469. return err
  1470. }
  1471. }
  1472. // If we didn't just create the data or metadata image, we need to
  1473. // load the transaction id and migrate old metadata
  1474. if !createdLoopback {
  1475. if err := devices.initMetaData(); err != nil {
  1476. return err
  1477. }
  1478. }
  1479. if devices.thinPoolDevice == "" {
  1480. if devices.metadataLoopFile != "" || devices.dataLoopFile != "" {
  1481. 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.")
  1482. }
  1483. }
  1484. // Right now this loads only NextDeviceID. If there is more metadata
  1485. // down the line, we might have to move it earlier.
  1486. if err := devices.loadDeviceSetMetaData(); err != nil {
  1487. return err
  1488. }
  1489. // Setup the base image
  1490. if doInit {
  1491. if err := devices.setupBaseImage(); err != nil {
  1492. logrus.Debugf("devmapper: Error device setupBaseImage: %s", err)
  1493. return err
  1494. }
  1495. }
  1496. return nil
  1497. }
  1498. // AddDevice adds a device and registers in the hash.
  1499. func (devices *DeviceSet) AddDevice(hash, baseHash string) error {
  1500. logrus.Debugf("devmapper: AddDevice(hash=%s basehash=%s)", hash, baseHash)
  1501. defer logrus.Debugf("devmapper: AddDevice(hash=%s basehash=%s) END", hash, baseHash)
  1502. // If a deleted device exists, return error.
  1503. baseInfo, err := devices.lookupDeviceWithLock(baseHash)
  1504. if err != nil {
  1505. return err
  1506. }
  1507. if baseInfo.Deleted {
  1508. return fmt.Errorf("devmapper: Base device %v has been marked for deferred deletion", baseInfo.Hash)
  1509. }
  1510. baseInfo.lock.Lock()
  1511. defer baseInfo.lock.Unlock()
  1512. devices.Lock()
  1513. defer devices.Unlock()
  1514. // Also include deleted devices in case hash of new device is
  1515. // same as one of the deleted devices.
  1516. if info, _ := devices.lookupDevice(hash); info != nil {
  1517. return fmt.Errorf("devmapper: device %s already exists. Deleted=%v", hash, info.Deleted)
  1518. }
  1519. if err := devices.createRegisterSnapDevice(hash, baseInfo); err != nil {
  1520. return err
  1521. }
  1522. return nil
  1523. }
  1524. func (devices *DeviceSet) markForDeferredDeletion(info *devInfo) error {
  1525. // If device is already in deleted state, there is nothing to be done.
  1526. if info.Deleted {
  1527. return nil
  1528. }
  1529. logrus.Debugf("devmapper: Marking device %s for deferred deletion.", info.Hash)
  1530. info.Deleted = true
  1531. // save device metadata to reflect deleted state.
  1532. if err := devices.saveMetadata(info); err != nil {
  1533. info.Deleted = false
  1534. return err
  1535. }
  1536. devices.nrDeletedDevices++
  1537. return nil
  1538. }
  1539. // Should be called with devices.Lock() held.
  1540. func (devices *DeviceSet) deleteTransaction(info *devInfo, syncDelete bool) error {
  1541. if err := devices.openTransaction(info.Hash, info.DeviceID); err != nil {
  1542. logrus.Debugf("devmapper: Error opening transaction hash = %s deviceId = %d", "", info.DeviceID)
  1543. return err
  1544. }
  1545. defer devices.closeTransaction()
  1546. err := devicemapper.DeleteDevice(devices.getPoolDevName(), info.DeviceID)
  1547. if err != nil {
  1548. // If syncDelete is true, we want to return error. If deferred
  1549. // deletion is not enabled, we return an error. If error is
  1550. // something other then EBUSY, return an error.
  1551. if syncDelete || !devices.deferredDelete || err != devicemapper.ErrBusy {
  1552. logrus.Debugf("devmapper: Error deleting device: %s", err)
  1553. return err
  1554. }
  1555. }
  1556. if err == nil {
  1557. if err := devices.unregisterDevice(info.DeviceID, info.Hash); err != nil {
  1558. return err
  1559. }
  1560. // If device was already in deferred delete state that means
  1561. // deletion was being tried again later. Reduce the deleted
  1562. // device count.
  1563. if info.Deleted {
  1564. devices.nrDeletedDevices--
  1565. }
  1566. devices.markDeviceIDFree(info.DeviceID)
  1567. } else {
  1568. if err := devices.markForDeferredDeletion(info); err != nil {
  1569. return err
  1570. }
  1571. }
  1572. return nil
  1573. }
  1574. // Issue discard only if device open count is zero.
  1575. func (devices *DeviceSet) issueDiscard(info *devInfo) error {
  1576. logrus.Debugf("devmapper: issueDiscard(device: %s). START", info.Hash)
  1577. defer logrus.Debugf("devmapper: issueDiscard(device: %s). END", info.Hash)
  1578. // This is a workaround for the kernel not discarding block so
  1579. // on the thin pool when we remove a thinp device, so we do it
  1580. // manually.
  1581. // Even if device is deferred deleted, activate it and issue
  1582. // discards.
  1583. if err := devices.activateDeviceIfNeeded(info, true); err != nil {
  1584. return err
  1585. }
  1586. devinfo, err := devicemapper.GetInfo(info.Name())
  1587. if err != nil {
  1588. return err
  1589. }
  1590. if devinfo.OpenCount != 0 {
  1591. logrus.Debugf("devmapper: Device: %s is in use. OpenCount=%d. Not issuing discards.", info.Hash, devinfo.OpenCount)
  1592. return nil
  1593. }
  1594. if err := devicemapper.BlockDeviceDiscard(info.DevName()); err != nil {
  1595. logrus.Debugf("devmapper: Error discarding block on device: %s (ignoring)", err)
  1596. }
  1597. return nil
  1598. }
  1599. // Should be called with devices.Lock() held.
  1600. func (devices *DeviceSet) deleteDevice(info *devInfo, syncDelete bool) error {
  1601. if devices.doBlkDiscard {
  1602. devices.issueDiscard(info)
  1603. }
  1604. // Try to deactivate device in case it is active.
  1605. if err := devices.deactivateDevice(info); err != nil {
  1606. logrus.Debugf("devmapper: Error deactivating device: %s", err)
  1607. return err
  1608. }
  1609. if err := devices.deleteTransaction(info, syncDelete); err != nil {
  1610. return err
  1611. }
  1612. return nil
  1613. }
  1614. // DeleteDevice will return success if device has been marked for deferred
  1615. // removal. If one wants to override that and want DeleteDevice() to fail if
  1616. // device was busy and could not be deleted, set syncDelete=true.
  1617. func (devices *DeviceSet) DeleteDevice(hash string, syncDelete bool) error {
  1618. logrus.Debugf("devmapper: DeleteDevice(hash=%v syncDelete=%v) START", hash, syncDelete)
  1619. defer logrus.Debugf("devmapper: DeleteDevice(hash=%v syncDelete=%v) END", hash, syncDelete)
  1620. info, err := devices.lookupDeviceWithLock(hash)
  1621. if err != nil {
  1622. return err
  1623. }
  1624. info.lock.Lock()
  1625. defer info.lock.Unlock()
  1626. devices.Lock()
  1627. defer devices.Unlock()
  1628. // If mountcount is not zero, that means devices is still in use
  1629. // or has not been Put() properly. Fail device deletion.
  1630. if info.mountCount != 0 {
  1631. return fmt.Errorf("devmapper: Can't delete device %v as it is still mounted. mntCount=%v", info.Hash, info.mountCount)
  1632. }
  1633. return devices.deleteDevice(info, syncDelete)
  1634. }
  1635. func (devices *DeviceSet) deactivatePool() error {
  1636. logrus.Debugf("devmapper: deactivatePool()")
  1637. defer logrus.Debugf("devmapper: deactivatePool END")
  1638. devname := devices.getPoolDevName()
  1639. devinfo, err := devicemapper.GetInfo(devname)
  1640. if err != nil {
  1641. return err
  1642. }
  1643. if devinfo.Exists == 0 {
  1644. return nil
  1645. }
  1646. if err := devicemapper.RemoveDevice(devname); err != nil {
  1647. return err
  1648. }
  1649. if d, err := devicemapper.GetDeps(devname); err == nil {
  1650. logrus.Warnf("devmapper: device %s still has %d active dependents", devname, d.Count)
  1651. }
  1652. return nil
  1653. }
  1654. func (devices *DeviceSet) deactivateDevice(info *devInfo) error {
  1655. logrus.Debugf("devmapper: deactivateDevice(%s)", info.Hash)
  1656. defer logrus.Debugf("devmapper: deactivateDevice END(%s)", info.Hash)
  1657. devinfo, err := devicemapper.GetInfo(info.Name())
  1658. if err != nil {
  1659. return err
  1660. }
  1661. if devinfo.Exists == 0 {
  1662. return nil
  1663. }
  1664. if devices.deferredRemove {
  1665. if err := devicemapper.RemoveDeviceDeferred(info.Name()); err != nil {
  1666. return err
  1667. }
  1668. } else {
  1669. if err := devices.removeDevice(info.Name()); err != nil {
  1670. return err
  1671. }
  1672. }
  1673. return nil
  1674. }
  1675. // Issues the underlying dm remove operation.
  1676. func (devices *DeviceSet) removeDevice(devname string) error {
  1677. var err error
  1678. logrus.Debugf("devmapper: removeDevice START(%s)", devname)
  1679. defer logrus.Debugf("devmapper: removeDevice END(%s)", devname)
  1680. for i := 0; i < 200; i++ {
  1681. err = devicemapper.RemoveDevice(devname)
  1682. if err == nil {
  1683. break
  1684. }
  1685. if err != devicemapper.ErrBusy {
  1686. return err
  1687. }
  1688. // If we see EBUSY it may be a transient error,
  1689. // sleep a bit a retry a few times.
  1690. devices.Unlock()
  1691. time.Sleep(100 * time.Millisecond)
  1692. devices.Lock()
  1693. }
  1694. return err
  1695. }
  1696. func (devices *DeviceSet) cancelDeferredRemoval(info *devInfo) error {
  1697. if !devices.deferredRemove {
  1698. return nil
  1699. }
  1700. logrus.Debugf("devmapper: cancelDeferredRemoval START(%s)", info.Name())
  1701. defer logrus.Debugf("devmapper: cancelDeferredRemoval END(%s)", info.Name())
  1702. devinfo, err := devicemapper.GetInfoWithDeferred(info.Name())
  1703. if devinfo != nil && devinfo.DeferredRemove == 0 {
  1704. return nil
  1705. }
  1706. // Cancel deferred remove
  1707. for i := 0; i < 100; i++ {
  1708. err = devicemapper.CancelDeferredRemove(info.Name())
  1709. if err == nil {
  1710. break
  1711. }
  1712. if err == devicemapper.ErrEnxio {
  1713. // Device is probably already gone. Return success.
  1714. return nil
  1715. }
  1716. if err != devicemapper.ErrBusy {
  1717. return err
  1718. }
  1719. // If we see EBUSY it may be a transient error,
  1720. // sleep a bit a retry a few times.
  1721. devices.Unlock()
  1722. time.Sleep(100 * time.Millisecond)
  1723. devices.Lock()
  1724. }
  1725. return err
  1726. }
  1727. // Shutdown shuts down the device by unmounting the root.
  1728. func (devices *DeviceSet) Shutdown() error {
  1729. logrus.Debugf("devmapper: [deviceset %s] Shutdown()", devices.devicePrefix)
  1730. logrus.Debugf("devmapper: Shutting down DeviceSet: %s", devices.root)
  1731. defer logrus.Debugf("devmapper: [deviceset %s] Shutdown() END", devices.devicePrefix)
  1732. var devs []*devInfo
  1733. // Stop deletion worker. This should start delivering new events to
  1734. // ticker channel. That means no new instance of cleanupDeletedDevice()
  1735. // will run after this call. If one instance is already running at
  1736. // the time of the call, it must be holding devices.Lock() and
  1737. // we will block on this lock till cleanup function exits.
  1738. devices.deletionWorkerTicker.Stop()
  1739. devices.Lock()
  1740. // Save DeviceSet Metadata first. Docker kills all threads if they
  1741. // don't finish in certain time. It is possible that Shutdown()
  1742. // routine does not finish in time as we loop trying to deactivate
  1743. // some devices while these are busy. In that case shutdown() routine
  1744. // will be killed and we will not get a chance to save deviceset
  1745. // metadata. Hence save this early before trying to deactivate devices.
  1746. devices.saveDeviceSetMetaData()
  1747. for _, info := range devices.Devices {
  1748. devs = append(devs, info)
  1749. }
  1750. devices.Unlock()
  1751. for _, info := range devs {
  1752. info.lock.Lock()
  1753. if info.mountCount > 0 {
  1754. // We use MNT_DETACH here in case it is still busy in some running
  1755. // container. This means it'll go away from the global scope directly,
  1756. // and the device will be released when that container dies.
  1757. if err := syscall.Unmount(info.mountPath, syscall.MNT_DETACH); err != nil {
  1758. logrus.Debugf("devmapper: Shutdown unmounting %s, error: %s", info.mountPath, err)
  1759. }
  1760. devices.Lock()
  1761. if err := devices.deactivateDevice(info); err != nil {
  1762. logrus.Debugf("devmapper: Shutdown deactivate %s , error: %s", info.Hash, err)
  1763. }
  1764. devices.Unlock()
  1765. }
  1766. info.lock.Unlock()
  1767. }
  1768. info, _ := devices.lookupDeviceWithLock("")
  1769. if info != nil {
  1770. info.lock.Lock()
  1771. devices.Lock()
  1772. if err := devices.deactivateDevice(info); err != nil {
  1773. logrus.Debugf("devmapper: Shutdown deactivate base , error: %s", err)
  1774. }
  1775. devices.Unlock()
  1776. info.lock.Unlock()
  1777. }
  1778. devices.Lock()
  1779. if devices.thinPoolDevice == "" {
  1780. if err := devices.deactivatePool(); err != nil {
  1781. logrus.Debugf("devmapper: Shutdown deactivate pool , error: %s", err)
  1782. }
  1783. }
  1784. devices.Unlock()
  1785. return nil
  1786. }
  1787. // MountDevice mounts the device if not already mounted.
  1788. func (devices *DeviceSet) MountDevice(hash, path, mountLabel string) error {
  1789. info, err := devices.lookupDeviceWithLock(hash)
  1790. if err != nil {
  1791. return err
  1792. }
  1793. if info.Deleted {
  1794. return fmt.Errorf("devmapper: Can't mount device %v as it has been marked for deferred deletion", info.Hash)
  1795. }
  1796. info.lock.Lock()
  1797. defer info.lock.Unlock()
  1798. devices.Lock()
  1799. defer devices.Unlock()
  1800. if info.mountCount > 0 {
  1801. if path != info.mountPath {
  1802. return fmt.Errorf("devmapper: Trying to mount devmapper device in multiple places (%s, %s)", info.mountPath, path)
  1803. }
  1804. info.mountCount++
  1805. return nil
  1806. }
  1807. if err := devices.activateDeviceIfNeeded(info, false); err != nil {
  1808. return fmt.Errorf("devmapper: Error activating devmapper device for '%s': %s", hash, err)
  1809. }
  1810. fstype, err := ProbeFsType(info.DevName())
  1811. if err != nil {
  1812. return err
  1813. }
  1814. options := ""
  1815. if fstype == "xfs" {
  1816. // XFS needs nouuid or it can't mount filesystems with the same fs
  1817. options = joinMountOptions(options, "nouuid")
  1818. }
  1819. options = joinMountOptions(options, devices.mountOptions)
  1820. options = joinMountOptions(options, label.FormatMountLabel("", mountLabel))
  1821. if err := mount.Mount(info.DevName(), path, fstype, options); err != nil {
  1822. return fmt.Errorf("devmapper: Error mounting '%s' on '%s': %s", info.DevName(), path, err)
  1823. }
  1824. info.mountCount = 1
  1825. info.mountPath = path
  1826. return nil
  1827. }
  1828. // UnmountDevice unmounts the device and removes it from hash.
  1829. func (devices *DeviceSet) UnmountDevice(hash, mountPath string) error {
  1830. logrus.Debugf("devmapper: UnmountDevice(hash=%s)", hash)
  1831. defer logrus.Debugf("devmapper: UnmountDevice(hash=%s) END", hash)
  1832. info, err := devices.lookupDeviceWithLock(hash)
  1833. if err != nil {
  1834. return err
  1835. }
  1836. info.lock.Lock()
  1837. defer info.lock.Unlock()
  1838. devices.Lock()
  1839. defer devices.Unlock()
  1840. // If there are running containers when daemon crashes, during daemon
  1841. // restarting, it will kill running containers and will finally call
  1842. // Put() without calling Get(). So info.MountCount may become negative.
  1843. // if info.mountCount goes negative, we do the unmount and assign
  1844. // it to 0.
  1845. info.mountCount--
  1846. if info.mountCount > 0 {
  1847. return nil
  1848. } else if info.mountCount < 0 {
  1849. logrus.Warnf("devmapper: Mount count of device went negative. Put() called without matching Get(). Resetting count to 0")
  1850. info.mountCount = 0
  1851. }
  1852. logrus.Debugf("devmapper: Unmount(%s)", mountPath)
  1853. if err := syscall.Unmount(mountPath, syscall.MNT_DETACH); err != nil {
  1854. return err
  1855. }
  1856. logrus.Debugf("devmapper: Unmount done")
  1857. if err := devices.deactivateDevice(info); err != nil {
  1858. return err
  1859. }
  1860. info.mountPath = ""
  1861. return nil
  1862. }
  1863. // HasDevice returns true if the device metadata exists.
  1864. func (devices *DeviceSet) HasDevice(hash string) bool {
  1865. info, _ := devices.lookupDeviceWithLock(hash)
  1866. return info != nil
  1867. }
  1868. // List returns a list of device ids.
  1869. func (devices *DeviceSet) List() []string {
  1870. devices.Lock()
  1871. defer devices.Unlock()
  1872. ids := make([]string, len(devices.Devices))
  1873. i := 0
  1874. for k := range devices.Devices {
  1875. ids[i] = k
  1876. i++
  1877. }
  1878. return ids
  1879. }
  1880. func (devices *DeviceSet) deviceStatus(devName string) (sizeInSectors, mappedSectors, highestMappedSector uint64, err error) {
  1881. var params string
  1882. _, sizeInSectors, _, params, err = devicemapper.GetStatus(devName)
  1883. if err != nil {
  1884. return
  1885. }
  1886. if _, err = fmt.Sscanf(params, "%d %d", &mappedSectors, &highestMappedSector); err == nil {
  1887. return
  1888. }
  1889. return
  1890. }
  1891. // GetDeviceStatus provides size, mapped sectors
  1892. func (devices *DeviceSet) GetDeviceStatus(hash string) (*DevStatus, error) {
  1893. info, err := devices.lookupDeviceWithLock(hash)
  1894. if err != nil {
  1895. return nil, err
  1896. }
  1897. info.lock.Lock()
  1898. defer info.lock.Unlock()
  1899. devices.Lock()
  1900. defer devices.Unlock()
  1901. status := &DevStatus{
  1902. DeviceID: info.DeviceID,
  1903. Size: info.Size,
  1904. TransactionID: info.TransactionID,
  1905. }
  1906. if err := devices.activateDeviceIfNeeded(info, false); err != nil {
  1907. return nil, fmt.Errorf("devmapper: Error activating devmapper device for '%s': %s", hash, err)
  1908. }
  1909. sizeInSectors, mappedSectors, highestMappedSector, err := devices.deviceStatus(info.DevName())
  1910. if err != nil {
  1911. return nil, err
  1912. }
  1913. status.SizeInSectors = sizeInSectors
  1914. status.MappedSectors = mappedSectors
  1915. status.HighestMappedSector = highestMappedSector
  1916. return status, nil
  1917. }
  1918. func (devices *DeviceSet) poolStatus() (totalSizeInSectors, transactionID, dataUsed, dataTotal, metadataUsed, metadataTotal uint64, err error) {
  1919. var params string
  1920. if _, totalSizeInSectors, _, params, err = devicemapper.GetStatus(devices.getPoolName()); err == nil {
  1921. _, err = fmt.Sscanf(params, "%d %d/%d %d/%d", &transactionID, &metadataUsed, &metadataTotal, &dataUsed, &dataTotal)
  1922. }
  1923. return
  1924. }
  1925. // DataDevicePath returns the path to the data storage for this deviceset,
  1926. // regardless of loopback or block device
  1927. func (devices *DeviceSet) DataDevicePath() string {
  1928. return devices.dataDevice
  1929. }
  1930. // MetadataDevicePath returns the path to the metadata storage for this deviceset,
  1931. // regardless of loopback or block device
  1932. func (devices *DeviceSet) MetadataDevicePath() string {
  1933. return devices.metadataDevice
  1934. }
  1935. func (devices *DeviceSet) getUnderlyingAvailableSpace(loopFile string) (uint64, error) {
  1936. buf := new(syscall.Statfs_t)
  1937. if err := syscall.Statfs(loopFile, buf); err != nil {
  1938. logrus.Warnf("devmapper: Couldn't stat loopfile filesystem %v: %v", loopFile, err)
  1939. return 0, err
  1940. }
  1941. return buf.Bfree * uint64(buf.Bsize), nil
  1942. }
  1943. func (devices *DeviceSet) isRealFile(loopFile string) (bool, error) {
  1944. if loopFile != "" {
  1945. fi, err := os.Stat(loopFile)
  1946. if err != nil {
  1947. logrus.Warnf("devmapper: Couldn't stat loopfile %v: %v", loopFile, err)
  1948. return false, err
  1949. }
  1950. return fi.Mode().IsRegular(), nil
  1951. }
  1952. return false, nil
  1953. }
  1954. // Status returns the current status of this deviceset
  1955. func (devices *DeviceSet) Status() *Status {
  1956. devices.Lock()
  1957. defer devices.Unlock()
  1958. status := &Status{}
  1959. status.PoolName = devices.getPoolName()
  1960. status.DataFile = devices.DataDevicePath()
  1961. status.DataLoopback = devices.dataLoopFile
  1962. status.MetadataFile = devices.MetadataDevicePath()
  1963. status.MetadataLoopback = devices.metadataLoopFile
  1964. status.UdevSyncSupported = devicemapper.UdevSyncSupported()
  1965. status.DeferredRemoveEnabled = devices.deferredRemove
  1966. status.DeferredDeleteEnabled = devices.deferredDelete
  1967. status.DeferredDeletedDeviceCount = devices.nrDeletedDevices
  1968. status.BaseDeviceSize = devices.getBaseDeviceSize()
  1969. status.BaseDeviceFS = devices.getBaseDeviceFS()
  1970. totalSizeInSectors, _, dataUsed, dataTotal, metadataUsed, metadataTotal, err := devices.poolStatus()
  1971. if err == nil {
  1972. // Convert from blocks to bytes
  1973. blockSizeInSectors := totalSizeInSectors / dataTotal
  1974. status.Data.Used = dataUsed * blockSizeInSectors * 512
  1975. status.Data.Total = dataTotal * blockSizeInSectors * 512
  1976. status.Data.Available = status.Data.Total - status.Data.Used
  1977. // metadata blocks are always 4k
  1978. status.Metadata.Used = metadataUsed * 4096
  1979. status.Metadata.Total = metadataTotal * 4096
  1980. status.Metadata.Available = status.Metadata.Total - status.Metadata.Used
  1981. status.SectorSize = blockSizeInSectors * 512
  1982. if check, _ := devices.isRealFile(devices.dataLoopFile); check {
  1983. actualSpace, err := devices.getUnderlyingAvailableSpace(devices.dataLoopFile)
  1984. if err == nil && actualSpace < status.Data.Available {
  1985. status.Data.Available = actualSpace
  1986. }
  1987. }
  1988. if check, _ := devices.isRealFile(devices.metadataLoopFile); check {
  1989. actualSpace, err := devices.getUnderlyingAvailableSpace(devices.metadataLoopFile)
  1990. if err == nil && actualSpace < status.Metadata.Available {
  1991. status.Metadata.Available = actualSpace
  1992. }
  1993. }
  1994. }
  1995. return status
  1996. }
  1997. // Status returns the current status of this deviceset
  1998. func (devices *DeviceSet) exportDeviceMetadata(hash string) (*deviceMetadata, error) {
  1999. info, err := devices.lookupDeviceWithLock(hash)
  2000. if err != nil {
  2001. return nil, err
  2002. }
  2003. info.lock.Lock()
  2004. defer info.lock.Unlock()
  2005. metadata := &deviceMetadata{info.DeviceID, info.Size, info.Name()}
  2006. return metadata, nil
  2007. }
  2008. // NewDeviceSet creates the device set based on the options provided.
  2009. func NewDeviceSet(root string, doInit bool, options []string, uidMaps, gidMaps []idtools.IDMap) (*DeviceSet, error) {
  2010. devicemapper.SetDevDir("/dev")
  2011. devices := &DeviceSet{
  2012. root: root,
  2013. metaData: metaData{Devices: make(map[string]*devInfo)},
  2014. dataLoopbackSize: defaultDataLoopbackSize,
  2015. metaDataLoopbackSize: defaultMetaDataLoopbackSize,
  2016. baseFsSize: defaultBaseFsSize,
  2017. overrideUdevSyncCheck: defaultUdevSyncOverride,
  2018. doBlkDiscard: true,
  2019. thinpBlockSize: defaultThinpBlockSize,
  2020. deviceIDMap: make([]byte, deviceIDMapSz),
  2021. deletionWorkerTicker: time.NewTicker(time.Second * 30),
  2022. uidMaps: uidMaps,
  2023. gidMaps: gidMaps,
  2024. }
  2025. foundBlkDiscard := false
  2026. for _, option := range options {
  2027. key, val, err := parsers.ParseKeyValueOpt(option)
  2028. if err != nil {
  2029. return nil, err
  2030. }
  2031. key = strings.ToLower(key)
  2032. switch key {
  2033. case "dm.basesize":
  2034. size, err := units.RAMInBytes(val)
  2035. if err != nil {
  2036. return nil, err
  2037. }
  2038. userBaseSize = true
  2039. devices.baseFsSize = uint64(size)
  2040. case "dm.loopdatasize":
  2041. size, err := units.RAMInBytes(val)
  2042. if err != nil {
  2043. return nil, err
  2044. }
  2045. devices.dataLoopbackSize = size
  2046. case "dm.loopmetadatasize":
  2047. size, err := units.RAMInBytes(val)
  2048. if err != nil {
  2049. return nil, err
  2050. }
  2051. devices.metaDataLoopbackSize = size
  2052. case "dm.fs":
  2053. if val != "ext4" && val != "xfs" {
  2054. return nil, fmt.Errorf("devmapper: Unsupported filesystem %s\n", val)
  2055. }
  2056. devices.filesystem = val
  2057. case "dm.mkfsarg":
  2058. devices.mkfsArgs = append(devices.mkfsArgs, val)
  2059. case "dm.mountopt":
  2060. devices.mountOptions = joinMountOptions(devices.mountOptions, val)
  2061. case "dm.metadatadev":
  2062. devices.metadataDevice = val
  2063. case "dm.datadev":
  2064. devices.dataDevice = val
  2065. case "dm.thinpooldev":
  2066. devices.thinPoolDevice = strings.TrimPrefix(val, "/dev/mapper/")
  2067. case "dm.blkdiscard":
  2068. foundBlkDiscard = true
  2069. devices.doBlkDiscard, err = strconv.ParseBool(val)
  2070. if err != nil {
  2071. return nil, err
  2072. }
  2073. case "dm.blocksize":
  2074. size, err := units.RAMInBytes(val)
  2075. if err != nil {
  2076. return nil, err
  2077. }
  2078. // convert to 512b sectors
  2079. devices.thinpBlockSize = uint32(size) >> 9
  2080. case "dm.override_udev_sync_check":
  2081. devices.overrideUdevSyncCheck, err = strconv.ParseBool(val)
  2082. if err != nil {
  2083. return nil, err
  2084. }
  2085. case "dm.use_deferred_removal":
  2086. enableDeferredRemoval, err = strconv.ParseBool(val)
  2087. if err != nil {
  2088. return nil, err
  2089. }
  2090. case "dm.use_deferred_deletion":
  2091. enableDeferredDeletion, err = strconv.ParseBool(val)
  2092. if err != nil {
  2093. return nil, err
  2094. }
  2095. default:
  2096. return nil, fmt.Errorf("devmapper: Unknown option %s\n", key)
  2097. }
  2098. }
  2099. // By default, don't do blk discard hack on raw devices, its rarely useful and is expensive
  2100. if !foundBlkDiscard && (devices.dataDevice != "" || devices.thinPoolDevice != "") {
  2101. devices.doBlkDiscard = false
  2102. }
  2103. if err := devices.initDevmapper(doInit); err != nil {
  2104. return nil, err
  2105. }
  2106. return devices, nil
  2107. }