/* * MinIO Cloud Storage, (C) 2016-2020 MinIO, Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package cmd import ( "bufio" "bytes" "context" "crypto/rand" "encoding/hex" "errors" "fmt" "io" "io/ioutil" "net/url" "os" "path" slashpath "path" "path/filepath" "runtime" "strings" "sync" "sync/atomic" "time" "github.com/dustin/go-humanize" "github.com/google/uuid" jsoniter "github.com/json-iterator/go" "github.com/klauspost/readahead" "github.com/minio/minio/cmd/config" "github.com/minio/minio/cmd/config/storageclass" "github.com/minio/minio/cmd/logger" "github.com/minio/minio/pkg/bucket/lifecycle" "github.com/minio/minio/pkg/color" "github.com/minio/minio/pkg/console" "github.com/minio/minio/pkg/disk" "github.com/minio/minio/pkg/env" xioutil "github.com/minio/minio/pkg/ioutil" ) const ( nullVersionID = "null" diskMinTotalSpace = 900 * humanize.MiByte // Min 900MiB total space. blockSizeLarge = 1 * humanize.MiByte // Default r/w block size for larger objects. blockSizeSmall = 128 * humanize.KiByte // Default r/w block size for smaller objects. // On regular files bigger than this; readAheadSize = 16 << 20 // Read this many buffers ahead. readAheadBuffers = 4 // Size of each buffer. readAheadBufSize = 1 << 20 // Small file threshold below which data accompanies metadata from storage layer. smallFileThreshold = 128 * humanize.KiByte // Optimized for NVMe/SSDs // For hardrives it is possible to set this to a lower value to avoid any // spike in latency. But currently we are simply keeping it optimal for SSDs. // XL metadata file carries per object metadata. xlStorageFormatFile = "xl.meta" ) // isValidVolname verifies a volname name in accordance with object // layer requirements. func isValidVolname(volname string) bool { if len(volname) < 3 { return false } if runtime.GOOS == "windows" { // Volname shouldn't have reserved characters in Windows. return !strings.ContainsAny(volname, `\:*?\"<>|`) } return true } // xlStorage - implements StorageAPI interface. type xlStorage struct { activeIOCount int32 diskPath string endpoint Endpoint globalSync bool poolLarge sync.Pool poolSmall sync.Pool rootDisk bool diskID string formatFileInfo os.FileInfo formatLegacy bool formatLastCheck time.Time diskInfoCache timedValue ctx context.Context sync.RWMutex } // checkPathLength - returns error if given path name length more than 255 func checkPathLength(pathName string) error { // Apple OS X path length is limited to 1016 if runtime.GOOS == "darwin" && len(pathName) > 1016 { return errFileNameTooLong } // Disallow more than 1024 characters on windows, there // are no known name_max limits on Windows. if runtime.GOOS == "windows" && len(pathName) > 1024 { return errFileNameTooLong } // On Unix we reject paths if they are just '.', '..' or '/' if pathName == "." || pathName == ".." || pathName == slashSeparator { return errFileAccessDenied } // Check each path segment length is > 255 on all Unix // platforms, look for this value as NAME_MAX in // /usr/include/linux/limits.h var count int64 for _, p := range pathName { switch p { case '/': count = 0 // Reset case '\\': if runtime.GOOS == globalWindowsOSName { count = 0 } default: count++ if count > 255 { return errFileNameTooLong } } } // Success. return nil } func getValidPath(path string, requireDirectIO bool) (string, error) { if path == "" { return path, errInvalidArgument } var err error // Disallow relative paths, figure out absolute paths. path, err = filepath.Abs(path) if err != nil { return path, err } fi, err := os.Stat(path) if err != nil && !osIsNotExist(err) { return path, err } if osIsNotExist(err) { // Disk not found create it. if err = os.MkdirAll(path, 0777); err != nil { return path, err } } if fi != nil && !fi.IsDir() { return path, errDiskNotDir } // check if backend is writable. var rnd [8]byte _, _ = rand.Read(rnd[:]) fn := pathJoin(path, ".writable-check-"+hex.EncodeToString(rnd[:])+".tmp") defer os.Remove(fn) var file *os.File if requireDirectIO { // only erasure coding needs direct-io support file, err = disk.OpenFileDirectIO(fn, os.O_CREATE|os.O_EXCL, 0666) } else { file, err = os.OpenFile(fn, os.O_CREATE|os.O_EXCL, 0666) } // open file in direct I/O and use default umask, this also verifies // if direct i/o failed. if err != nil { if isSysErrInvalidArg(err) { // O_DIRECT not supported return path, errUnsupportedDisk } return path, osErrToFileErr(err) } file.Close() di, err := getDiskInfo(path) if err != nil { return path, err } if err = checkDiskMinTotal(di); err != nil { return path, err } return path, nil } // isDirEmpty - returns whether given directory is empty or not. func isDirEmpty(dirname string) bool { entries, err := readDirN(dirname, 1) if err != nil { if err != errFileNotFound { logger.LogIf(GlobalContext, err) } return false } return len(entries) == 0 } // Initialize a new storage disk. func newLocalXLStorage(path string) (*xlStorage, error) { u := url.URL{Path: path} return newXLStorage(Endpoint{ URL: &u, IsLocal: true, }) } // Initialize a new storage disk. func newXLStorage(ep Endpoint) (*xlStorage, error) { path := ep.Path var err error if path, err = getValidPath(path, true); err != nil { return nil, err } var rootDisk bool if env.Get("MINIO_CI_CD", "") != "" { rootDisk = true } else { rootDisk, err = disk.IsRootDisk(path, "/") if err != nil { return nil, err } } p := &xlStorage{ diskPath: path, endpoint: ep, poolLarge: sync.Pool{ New: func() interface{} { b := disk.AlignedBlock(blockSizeLarge) return &b }, }, poolSmall: sync.Pool{ New: func() interface{} { b := disk.AlignedBlock(blockSizeSmall) return &b }, }, globalSync: env.Get(config.EnvFSOSync, config.EnableOff) == config.EnableOn, ctx: GlobalContext, rootDisk: rootDisk, } // Success. return p, nil } // getDiskInfo returns given disk information. func getDiskInfo(diskPath string) (di disk.Info, err error) { if err = checkPathLength(diskPath); err == nil { di, err = disk.GetInfo(diskPath) } switch { case osIsNotExist(err): err = errDiskNotFound case isSysErrTooLong(err): err = errFileNameTooLong case isSysErrIO(err): err = errFaultyDisk } return di, err } // check if disk total has minimum required size. func checkDiskMinTotal(di disk.Info) (err error) { // Remove 5% from total space for cumulative disk space // used for journalling, inodes etc. totalDiskSpace := float64(di.Total) * diskFillFraction if int64(totalDiskSpace) <= diskMinTotalSpace { return errMinDiskSize } return nil } // Implements stringer compatible interface. func (s *xlStorage) String() string { return s.diskPath } func (s *xlStorage) Hostname() string { return s.endpoint.Host } func (s *xlStorage) Endpoint() Endpoint { return s.endpoint } func (*xlStorage) Close() error { return nil } func (s *xlStorage) IsOnline() bool { return true } func (s *xlStorage) IsLocal() bool { return true } func (s *xlStorage) Healing() bool { healingFile := pathJoin(s.diskPath, minioMetaBucket, bucketMetaPrefix, healingTrackerFilename) _, err := os.Stat(healingFile) return err == nil } func (s *xlStorage) CrawlAndGetDataUsage(ctx context.Context, cache dataUsageCache) (dataUsageCache, error) { var lc *lifecycle.Lifecycle var err error // Check if the current bucket has a configured lifecycle policy if globalLifecycleSys != nil { lc, err = globalLifecycleSys.Get(cache.Info.Name) if err == nil && lc.HasActiveRules("", true) { cache.Info.lifeCycle = lc if intDataUpdateTracker.debug { console.Debugln(color.Green("crawlDisk:") + " lifecycle: Active rules found") } } } // return initialized object layer objAPI := newObjectLayerFn() globalHealConfigMu.Lock() healOpts := globalHealConfig globalHealConfigMu.Unlock() dataUsageInfo, err := crawlDataFolder(ctx, s.diskPath, cache, func(item crawlItem) (sizeSummary, error) { // Look for `xl.meta/xl.json' at the leaf. if !strings.HasSuffix(item.Path, SlashSeparator+xlStorageFormatFile) && !strings.HasSuffix(item.Path, SlashSeparator+xlStorageFormatFileV1) { // if no xl.meta/xl.json found, skip the file. return sizeSummary{}, errSkipFile } buf, err := ioutil.ReadFile(item.Path) if err != nil { if intDataUpdateTracker.debug { console.Debugf(color.Green("crawlBucket:")+" object path missing: %v: %w\n", item.Path, err) } return sizeSummary{}, errSkipFile } // Remove filename which is the meta file. item.transformMetaDir() fivs, err := getFileInfoVersions(buf, item.bucket, item.objectPath()) if err != nil { if intDataUpdateTracker.debug { console.Debugf(color.Green("crawlBucket:")+" reading xl.meta failed: %v: %w\n", item.Path, err) } return sizeSummary{}, errSkipFile } var totalSize int64 var numVersions = len(fivs.Versions) sizeS := sizeSummary{} for i, version := range fivs.Versions { var successorModTime time.Time if i > 0 { successorModTime = fivs.Versions[i-1].ModTime } oi := version.ToObjectInfo(item.bucket, item.objectPath()) if objAPI != nil { totalSize += item.applyActions(ctx, objAPI, actionMeta{ numVersions: numVersions, successorModTime: successorModTime, oi: oi, bitRotScan: healOpts.Bitrot, }) item.healReplication(ctx, objAPI, oi, &sizeS) } } sizeS.totalSize = totalSize return sizeS, nil }) if err != nil { return dataUsageInfo, err } dataUsageInfo.Info.LastUpdate = time.Now() return dataUsageInfo, nil } // DiskInfo provides current information about disk space usage, // total free inodes and underlying filesystem. func (s *xlStorage) DiskInfo(context.Context) (info DiskInfo, err error) { atomic.AddInt32(&s.activeIOCount, 1) defer func() { atomic.AddInt32(&s.activeIOCount, -1) }() s.diskInfoCache.Once.Do(func() { s.diskInfoCache.TTL = time.Second s.diskInfoCache.Update = func() (interface{}, error) { dcinfo := DiskInfo{ RootDisk: s.rootDisk, MountPath: s.diskPath, Endpoint: s.endpoint.String(), } di, err := getDiskInfo(s.diskPath) if err != nil { return dcinfo, err } dcinfo.Total = di.Total dcinfo.Free = di.Free dcinfo.Used = di.Used dcinfo.UsedInodes = di.Files - di.Ffree dcinfo.FSType = di.FSType diskID, err := s.GetDiskID() if errors.Is(err, errUnformattedDisk) { // if we found an unformatted disk then // healing is automatically true. dcinfo.Healing = true } else { // Check if the disk is being healed if GetDiskID // returned any error other than fresh disk dcinfo.Healing = s.Healing() } dcinfo.ID = diskID return dcinfo, err } }) v, err := s.diskInfoCache.Get() info = v.(DiskInfo) return info, err } // getVolDir - will convert incoming volume names to // corresponding valid volume names on the backend in a platform // compatible way for all operating systems. If volume is not found // an error is generated. func (s *xlStorage) getVolDir(volume string) (string, error) { if volume == "" || volume == "." || volume == ".." { return "", errVolumeNotFound } volumeDir := pathJoin(s.diskPath, volume) return volumeDir, nil } // GetDiskID - returns the cached disk uuid func (s *xlStorage) GetDiskID() (string, error) { s.RLock() diskID := s.diskID fileInfo := s.formatFileInfo lastCheck := s.formatLastCheck s.RUnlock() // check if we have a valid disk ID that is less than 1 second old. if fileInfo != nil && diskID != "" && time.Since(lastCheck) <= time.Second { return diskID, nil } s.Lock() // If somebody else updated the disk ID and changed the time, return what they got. if !lastCheck.IsZero() && !s.formatLastCheck.Equal(lastCheck) && diskID != "" { s.Unlock() // Somebody else got the lock first. return diskID, nil } s.Unlock() formatFile := pathJoin(s.diskPath, minioMetaBucket, formatConfigFile) fi, err := os.Stat(formatFile) if err != nil { // If the disk is still not initialized. if osIsNotExist(err) { _, err = os.Stat(s.diskPath) if err == nil { // Disk is present but missing `format.json` return "", errUnformattedDisk } if osIsNotExist(err) { return "", errDiskNotFound } else if osIsPermission(err) { return "", errDiskAccessDenied } logger.LogIf(GlobalContext, err) // log unexpected errors return "", errCorruptedFormat } else if osIsPermission(err) { return "", errDiskAccessDenied } logger.LogIf(GlobalContext, err) // log unexpected errors return "", errCorruptedFormat } if xioutil.SameFile(fi, fileInfo) && diskID != "" { s.Lock() // If the file has not changed, just return the cached diskID information. s.formatLastCheck = time.Now() s.Unlock() return diskID, nil } b, err := ioutil.ReadFile(formatFile) if err != nil { // If the disk is still not initialized. if osIsNotExist(err) { _, err = os.Stat(s.diskPath) if err == nil { // Disk is present but missing `format.json` return "", errUnformattedDisk } if osIsNotExist(err) { return "", errDiskNotFound } else if osIsPermission(err) { return "", errDiskAccessDenied } logger.LogIf(GlobalContext, err) // log unexpected errors return "", errCorruptedFormat } else if osIsPermission(err) { return "", errDiskAccessDenied } logger.LogIf(GlobalContext, err) // log unexpected errors return "", errCorruptedFormat } format := &formatErasureV3{} var json = jsoniter.ConfigCompatibleWithStandardLibrary if err = json.Unmarshal(b, &format); err != nil { logger.LogIf(GlobalContext, err) // log unexpected errors return "", errCorruptedFormat } s.Lock() defer s.Unlock() s.diskID = format.Erasure.This s.formatLegacy = format.Erasure.DistributionAlgo == formatErasureVersionV2DistributionAlgoV1 s.formatFileInfo = fi s.formatLastCheck = time.Now() return s.diskID, nil } // Make a volume entry. func (s *xlStorage) SetDiskID(id string) { // NO-OP for xlStorage as it is handled either by xlStorageDiskIDCheck{} for local disks or // storage rest server for remote disks. } func (s *xlStorage) MakeVolBulk(ctx context.Context, volumes ...string) (err error) { for _, volume := range volumes { if err = s.MakeVol(ctx, volume); err != nil { if osIsPermission(err) { return errVolumeAccessDenied } } } return nil } // Make a volume entry. func (s *xlStorage) MakeVol(ctx context.Context, volume string) (err error) { if !isValidVolname(volume) { return errInvalidArgument } atomic.AddInt32(&s.activeIOCount, 1) defer func() { atomic.AddInt32(&s.activeIOCount, -1) }() volumeDir, err := s.getVolDir(volume) if err != nil { return err } if _, err := os.Stat(volumeDir); err != nil { // Volume does not exist we proceed to create. if osIsNotExist(err) { // Make a volume entry, with mode 0777 mkdir honors system umask. err = os.MkdirAll(volumeDir, 0777) } if osIsPermission(err) { return errDiskAccessDenied } else if isSysErrIO(err) { return errFaultyDisk } return err } // Stat succeeds we return errVolumeExists. return errVolumeExists } // ListVols - list volumes. func (s *xlStorage) ListVols(context.Context) (volsInfo []VolInfo, err error) { atomic.AddInt32(&s.activeIOCount, 1) defer func() { atomic.AddInt32(&s.activeIOCount, -1) }() return listVols(s.diskPath) } // List all the volumes from diskPath. func listVols(dirPath string) ([]VolInfo, error) { if err := checkPathLength(dirPath); err != nil { return nil, err } entries, err := readDir(dirPath) if err != nil { return nil, errDiskNotFound } volsInfo := make([]VolInfo, 0, len(entries)) for _, entry := range entries { if !HasSuffix(entry, SlashSeparator) || !isValidVolname(slashpath.Clean(entry)) { // Skip if entry is neither a directory not a valid volume name. continue } var fi os.FileInfo fi, err = os.Stat(pathJoin(dirPath, entry)) if err != nil { // If the file does not exist, skip the entry. if osIsNotExist(err) { continue } else if isSysErrIO(err) { return nil, errFaultyDisk } return nil, err } volsInfo = append(volsInfo, VolInfo{ Name: fi.Name(), // As os.Stat() doesn't carry other than ModTime(), use // ModTime() as CreatedTime. Created: fi.ModTime(), }) } return volsInfo, nil } // StatVol - get volume info. func (s *xlStorage) StatVol(ctx context.Context, volume string) (vol VolInfo, err error) { atomic.AddInt32(&s.activeIOCount, 1) defer func() { atomic.AddInt32(&s.activeIOCount, -1) }() // Verify if volume is valid and it exists. volumeDir, err := s.getVolDir(volume) if err != nil { return VolInfo{}, err } // Stat a volume entry. var st os.FileInfo st, err = os.Stat(volumeDir) if err != nil { switch { case osIsNotExist(err): return VolInfo{}, errVolumeNotFound case osIsPermission(err): return VolInfo{}, errDiskAccessDenied case isSysErrIO(err): return VolInfo{}, errFaultyDisk default: return VolInfo{}, err } } // As os.Stat() doesn't carry other than ModTime(), use ModTime() // as CreatedTime. createdTime := st.ModTime() return VolInfo{ Name: volume, Created: createdTime, }, nil } // DeleteVol - delete a volume. func (s *xlStorage) DeleteVol(ctx context.Context, volume string, forceDelete bool) (err error) { atomic.AddInt32(&s.activeIOCount, 1) defer func() { atomic.AddInt32(&s.activeIOCount, -1) }() // Verify if volume is valid and it exists. volumeDir, err := s.getVolDir(volume) if err != nil { return err } if forceDelete { err = os.RemoveAll(volumeDir) } else { err = os.Remove(volumeDir) } if err != nil { switch { case osIsNotExist(err): return errVolumeNotFound case isSysErrNotEmpty(err): return errVolumeNotEmpty case osIsPermission(err): return errDiskAccessDenied case isSysErrIO(err): return errFaultyDisk default: return err } } return nil } func (s *xlStorage) isLeaf(volume string, leafPath string) bool { volumeDir, err := s.getVolDir(volume) if err != nil { return false } _, err = os.Stat(pathJoin(volumeDir, leafPath, xlStorageFormatFile)) if err == nil { return true } if osIsNotExist(err) { // We need a fallback code where directory might contain // legacy `xl.json`, in such situation we just rename // and proceed if rename is successful we know that it // is the leaf since `xl.json` was present. return s.renameLegacyMetadata(volumeDir, leafPath) == nil } return false } func (s *xlStorage) isLeafDir(volume, leafPath string) bool { volumeDir, err := s.getVolDir(volume) if err != nil { return false } return isDirEmpty(pathJoin(volumeDir, leafPath)) } // WalkVersions - is a sorted walker which returns file entries in lexically sorted order, // additionally along with metadata version info about each of those entries. func (s *xlStorage) WalkVersions(ctx context.Context, volume, dirPath, marker string, recursive bool, endWalkCh <-chan struct{}) (ch chan FileInfoVersions, err error) { atomic.AddInt32(&s.activeIOCount, 1) defer func() { atomic.AddInt32(&s.activeIOCount, -1) }() // Verify if volume is valid and it exists. volumeDir, err := s.getVolDir(volume) if err != nil { return nil, err } // Stat a volume entry. _, err = os.Stat(volumeDir) if err != nil { if osIsNotExist(err) { return nil, errVolumeNotFound } else if isSysErrIO(err) { return nil, errFaultyDisk } return nil, err } // Fast exit track to check if we are listing an object with // a trailing slash, this will avoid to list the object content. if HasSuffix(dirPath, SlashSeparator) { if st, err := os.Stat(pathJoin(volumeDir, dirPath, xlStorageFormatFile)); err == nil && st.Mode().IsRegular() { return nil, errFileNotFound } } ch = make(chan FileInfoVersions) go func() { defer close(ch) listDir := func(volume, dirPath, dirEntry string) (emptyDir bool, entries []string, delayIsLeaf bool) { entries, err := s.ListDir(ctx, volume, dirPath, -1) if err != nil { return false, nil, false } if len(entries) == 0 { return true, nil, false } entries, delayIsLeaf = filterListEntries(volume, dirPath, entries, dirEntry, s.isLeaf) return false, entries, delayIsLeaf } walkResultCh := startTreeWalk(GlobalContext, volume, dirPath, marker, recursive, listDir, s.isLeaf, s.isLeafDir, endWalkCh) for walkResult := range walkResultCh { var fiv FileInfoVersions if HasSuffix(walkResult.entry, SlashSeparator) { fiv = FileInfoVersions{ Volume: volume, Name: walkResult.entry, Versions: []FileInfo{ { Volume: volume, Name: walkResult.entry, Mode: uint32(os.ModeDir), }, }, } } else { xlMetaBuf, err := ioutil.ReadFile(pathJoin(volumeDir, walkResult.entry, xlStorageFormatFile)) if err != nil { continue } fiv, err = getFileInfoVersions(xlMetaBuf, volume, walkResult.entry) if err != nil { continue } } select { case ch <- fiv: case <-endWalkCh: return } } }() return ch, nil } // ListDir - return all the entries at the given directory path. // If an entry is a directory it will be returned with a trailing SlashSeparator. func (s *xlStorage) ListDir(ctx context.Context, volume, dirPath string, count int) (entries []string, err error) { atomic.AddInt32(&s.activeIOCount, 1) defer func() { atomic.AddInt32(&s.activeIOCount, -1) }() // Verify if volume is valid and it exists. volumeDir, err := s.getVolDir(volume) if err != nil { return nil, err } dirPathAbs := pathJoin(volumeDir, dirPath) if count > 0 { entries, err = readDirN(dirPathAbs, count) } else { entries, err = readDir(dirPathAbs) } if err != nil { if err == errFileNotFound { if _, verr := os.Stat(volumeDir); verr != nil { if osIsNotExist(verr) { return nil, errVolumeNotFound } else if isSysErrIO(verr) { return nil, errFaultyDisk } } } return nil, err } return entries, nil } // DeleteVersions deletes slice of versions, it can be same object // or multiple objects. func (s *xlStorage) DeleteVersions(ctx context.Context, volume string, versions []FileInfo) []error { errs := make([]error, len(versions)) for i, version := range versions { if err := s.DeleteVersion(ctx, volume, version.Name, version); err != nil { errs[i] = err } } return errs } // DeleteVersion - deletes FileInfo metadata for path at `xl.meta` func (s *xlStorage) DeleteVersion(ctx context.Context, volume, path string, fi FileInfo) error { if HasSuffix(path, SlashSeparator) { return s.Delete(ctx, volume, path, false) } buf, err := s.ReadAll(ctx, volume, pathJoin(path, xlStorageFormatFile)) if err != nil { if err == errFileNotFound && fi.VersionID != "" { err = errFileVersionNotFound } return err } if len(buf) == 0 { if fi.VersionID != "" { return errFileVersionNotFound } return errFileNotFound } atomic.AddInt32(&s.activeIOCount, 1) defer func() { atomic.AddInt32(&s.activeIOCount, -1) }() volumeDir, err := s.getVolDir(volume) if err != nil { return err } if !isXL2V1Format(buf) { // Delete the meta file, if there are no more versions the // top level parent is automatically removed. return deleteFile(volumeDir, pathJoin(volumeDir, path), true) } var xlMeta xlMetaV2 if err = xlMeta.Load(buf); err != nil { return err } dataDir, lastVersion, err := xlMeta.DeleteVersion(fi) if err != nil { return err } buf, err = xlMeta.MarshalMsg(append(xlHeader[:], xlVersionV1[:]...)) if err != nil { return err } // when data-dir is specified. Transition leverages existing DeleteObject // api call to mark object as deleted.When object is pending transition, // just update the metadata and avoid deleting data dir. if dataDir != "" && fi.TransitionStatus != lifecycle.TransitionPending { filePath := pathJoin(volumeDir, path, dataDir) if err = checkPathLength(filePath); err != nil { return err } if err = removeAll(filePath); err != nil { return err } } // transitioned objects maintains metadata on the source cluster. When transition // status is set, update the metadata to disk. if !lastVersion || fi.TransitionStatus != "" { return s.WriteAll(ctx, volume, pathJoin(path, xlStorageFormatFile), buf) } // Delete the meta file, if there are no more versions the // top level parent is automatically removed. filePath := pathJoin(volumeDir, path, xlStorageFormatFile) if err = checkPathLength(filePath); err != nil { return err } return deleteFile(volumeDir, filePath, false) } // WriteMetadata - writes FileInfo metadata for path at `xl.meta` func (s *xlStorage) WriteMetadata(ctx context.Context, volume, path string, fi FileInfo) error { buf, err := s.ReadAll(ctx, volume, pathJoin(path, xlStorageFormatFile)) if err != nil && err != errFileNotFound { return err } atomic.AddInt32(&s.activeIOCount, 1) defer func() { atomic.AddInt32(&s.activeIOCount, -1) }() var xlMeta xlMetaV2 if !isXL2V1Format(buf) { xlMeta, err = newXLMetaV2(fi) if err != nil { return err } buf, err = xlMeta.MarshalMsg(append(xlHeader[:], xlVersionV1[:]...)) if err != nil { return err } } else { if err = xlMeta.Load(buf); err != nil { return err } if err = xlMeta.AddVersion(fi); err != nil { return err } buf, err = xlMeta.MarshalMsg(append(xlHeader[:], xlVersionV1[:]...)) if err != nil { return err } } return s.WriteAll(ctx, volume, pathJoin(path, xlStorageFormatFile), buf) } func (s *xlStorage) renameLegacyMetadata(volumeDir, path string) (err error) { s.RLock() legacy := s.formatLegacy s.RUnlock() if !legacy { // if its not a legacy backend then this function is // a no-op always returns errFileNotFound return errFileNotFound } atomic.AddInt32(&s.activeIOCount, 1) defer func() { atomic.AddInt32(&s.activeIOCount, -1) }() // Validate file path length, before reading. filePath := pathJoin(volumeDir, path) if err = checkPathLength(filePath); err != nil { return err } srcFilePath := pathJoin(filePath, xlStorageFormatFileV1) dstFilePath := pathJoin(filePath, xlStorageFormatFile) // Renaming xl.json to xl.meta should be fully synced to disk. defer func() { if err == nil { if s.globalSync { // Sync to disk only upon success. globalSync() } } }() if err = os.Rename(srcFilePath, dstFilePath); err != nil { switch { case isSysErrNotDir(err): return errFileNotFound case isSysErrPathNotFound(err): return errFileNotFound case isSysErrCrossDevice(err): return fmt.Errorf("%w (%s)->(%s)", errCrossDeviceLink, srcFilePath, dstFilePath) case osIsNotExist(err): return errFileNotFound case osIsExist(err): // This is returned only when destination is a directory and we // are attempting a rename from file to directory. return errIsNotRegular default: return err } } return nil } // ReadVersion - reads metadata and returns FileInfo at path `xl.meta` // for all objects less than `32KiB` this call returns data as well // along with metadata. func (s *xlStorage) ReadVersion(ctx context.Context, volume, path, versionID string, readData bool) (fi FileInfo, err error) { volumeDir, err := s.getVolDir(volume) if err != nil { return fi, err } buf, err := s.ReadAll(ctx, volume, pathJoin(path, xlStorageFormatFile)) if err != nil { if err == errFileNotFound { if err = s.renameLegacyMetadata(volumeDir, path); err != nil { if err == errFileNotFound { if versionID != "" { return fi, errFileVersionNotFound } return fi, errFileNotFound } return fi, err } buf, err = s.ReadAll(ctx, volume, pathJoin(path, xlStorageFormatFile)) if err != nil { if err == errFileNotFound { if versionID != "" { return fi, errFileVersionNotFound } return fi, errFileNotFound } return fi, err } } else { return fi, err } } if len(buf) == 0 { if versionID != "" { return fi, errFileVersionNotFound } return fi, errFileNotFound } fi, err = getFileInfo(buf, volume, path, versionID) if err != nil { return fi, err } if readData { // Reading data for small objects when // - object has not yet transitioned // - object size lesser than 32KiB // - object has maximum of 1 parts if fi.TransitionStatus == "" && fi.DataDir != "" && fi.Size <= smallFileThreshold && len(fi.Parts) == 1 { fi.Data, err = s.readAllData(volumeDir, pathJoin(volumeDir, path, fi.DataDir, fmt.Sprintf("part.%d", fi.Parts[0].Number))) if err != nil { return FileInfo{}, err } } } return fi, nil } func (s *xlStorage) readAllData(volumeDir, filePath string) (buf []byte, err error) { var f *os.File if globalStorageClass.GetDMA() == storageclass.DMAReadWrite { f, err = disk.OpenFileDirectIO(filePath, os.O_RDONLY, 0666) } else { f, err = os.Open(filePath) } if err != nil { if osIsNotExist(err) { // Check if the object doesn't exist because its bucket // is missing in order to return the correct error. _, err = os.Stat(volumeDir) if err != nil && osIsNotExist(err) { return nil, errVolumeNotFound } return nil, errFileNotFound } else if osIsPermission(err) { return nil, errFileAccessDenied } else if isSysErrNotDir(err) || isSysErrIsDir(err) { return nil, errFileNotFound } else if isSysErrHandleInvalid(err) { // This case is special and needs to be handled for windows. return nil, errFileNotFound } else if isSysErrIO(err) { return nil, errFaultyDisk } else if isSysErrTooManyFiles(err) { return nil, errTooManyOpenFiles } else if isSysErrInvalidArg(err) { return nil, errFileNotFound } return nil, err } atomic.AddInt32(&s.activeIOCount, 1) rd := &odirectReader{f, nil, nil, true, true, s, nil} defer rd.Close() return ioutil.ReadAll(rd) } // ReadAll reads from r until an error or EOF and returns the data it read. // A successful call returns err == nil, not err == EOF. Because ReadAll is // defined to read from src until EOF, it does not treat an EOF from Read // as an error to be reported. // This API is meant to be used on files which have small memory footprint, do // not use this on large files as it would cause server to crash. func (s *xlStorage) ReadAll(ctx context.Context, volume string, path string) (buf []byte, err error) { atomic.AddInt32(&s.activeIOCount, 1) defer func() { atomic.AddInt32(&s.activeIOCount, -1) }() volumeDir, err := s.getVolDir(volume) if err != nil { return nil, err } // Validate file path length, before reading. filePath := pathJoin(volumeDir, path) if err = checkPathLength(filePath); err != nil { return nil, err } buf, err = ioutil.ReadFile(filePath) if err != nil { if osIsNotExist(err) { // Check if the object doesn't exist because its bucket // is missing in order to return the correct error. _, err = os.Stat(volumeDir) if err != nil && osIsNotExist(err) { return nil, errVolumeNotFound } return nil, errFileNotFound } else if osIsPermission(err) { return nil, errFileAccessDenied } else if isSysErrNotDir(err) || isSysErrIsDir(err) { return nil, errFileNotFound } else if isSysErrHandleInvalid(err) { // This case is special and needs to be handled for windows. return nil, errFileNotFound } else if isSysErrIO(err) { return nil, errFaultyDisk } else if isSysErrTooManyFiles(err) { return nil, errTooManyOpenFiles } else if isSysErrInvalidArg(err) { return nil, errFileNotFound } return nil, err } return buf, nil } // ReadFile reads exactly len(buf) bytes into buf. It returns the // number of bytes copied. The error is EOF only if no bytes were // read. On return, n == len(buf) if and only if err == nil. n == 0 // for io.EOF. // // If an EOF happens after reading some but not all the bytes, // ReadFile returns ErrUnexpectedEOF. // // If the BitrotVerifier is not nil or not verified ReadFile // tries to verify whether the disk has bitrot. // // Additionally ReadFile also starts reading from an offset. ReadFile // semantics are same as io.ReadFull. func (s *xlStorage) ReadFile(ctx context.Context, volume string, path string, offset int64, buffer []byte, verifier *BitrotVerifier) (int64, error) { if offset < 0 { return 0, errInvalidArgument } atomic.AddInt32(&s.activeIOCount, 1) defer func() { atomic.AddInt32(&s.activeIOCount, -1) }() volumeDir, err := s.getVolDir(volume) if err != nil { return 0, err } var n int // Stat a volume entry. _, err = os.Stat(volumeDir) if err != nil { if osIsNotExist(err) { return 0, errVolumeNotFound } else if isSysErrIO(err) { return 0, errFaultyDisk } return 0, err } // Validate effective path length before reading. filePath := pathJoin(volumeDir, path) if err = checkPathLength(filePath); err != nil { return 0, err } // Open the file for reading. file, err := os.Open(filePath) if err != nil { switch { case osIsNotExist(err): return 0, errFileNotFound case osIsPermission(err): return 0, errFileAccessDenied case isSysErrNotDir(err): return 0, errFileAccessDenied case isSysErrIO(err): return 0, errFaultyDisk case isSysErrTooManyFiles(err): return 0, errTooManyOpenFiles default: return 0, err } } // Close the file descriptor. defer file.Close() st, err := file.Stat() if err != nil { return 0, err } // Verify it is a regular file, otherwise subsequent Seek is // undefined. if !st.Mode().IsRegular() { return 0, errIsNotRegular } if verifier == nil { n, err = file.ReadAt(buffer, offset) return int64(n), err } h := verifier.algorithm.New() if _, err = io.Copy(h, io.LimitReader(file, offset)); err != nil { return 0, err } if n, err = io.ReadFull(file, buffer); err != nil { return int64(n), err } if _, err = h.Write(buffer); err != nil { return 0, err } if _, err = io.Copy(h, file); err != nil { return 0, err } if !bytes.Equal(h.Sum(nil), verifier.sum) { return 0, errFileCorrupt } return int64(len(buffer)), nil } func (s *xlStorage) openFile(volume, path string, mode int) (f *os.File, err error) { volumeDir, err := s.getVolDir(volume) if err != nil { return nil, err } // Stat a volume entry. _, err = os.Stat(volumeDir) if err != nil { if osIsNotExist(err) { return nil, errVolumeNotFound } else if isSysErrIO(err) { return nil, errFaultyDisk } return nil, err } filePath := pathJoin(volumeDir, path) if err = checkPathLength(filePath); err != nil { return nil, err } // Verify if the file already exists and is not of regular type. var st os.FileInfo if st, err = os.Stat(filePath); err == nil { if !st.Mode().IsRegular() { return nil, errIsNotRegular } } else { // Create top level directories if they don't exist. // with mode 0777 mkdir honors system umask. if err = mkdirAll(slashpath.Dir(filePath), 0777); err != nil { return nil, err } } w, err := os.OpenFile(filePath, mode, 0666) if err != nil { // File path cannot be verified since one of the parents is a file. switch { case isSysErrNotDir(err): return nil, errFileAccessDenied case osIsPermission(err): return nil, errFileAccessDenied case isSysErrIO(err): return nil, errFaultyDisk case isSysErrTooManyFiles(err): return nil, errTooManyOpenFiles default: return nil, err } } return w, nil } // To support O_DIRECT reads for erasure backends. type odirectReader struct { f *os.File buf []byte bufp *[]byte freshRead bool smallFile bool s *xlStorage err error } // Read - Implements Reader interface. func (o *odirectReader) Read(buf []byte) (n int, err error) { if o.err != nil { return 0, o.err } if o.buf == nil { if o.smallFile { o.bufp = o.s.poolSmall.Get().(*[]byte) } else { o.bufp = o.s.poolLarge.Get().(*[]byte) } } if o.freshRead { o.buf = *o.bufp n, err = o.f.Read(o.buf) if err != nil && err != io.EOF { o.err = err return n, err } if n == 0 { // err is io.EOF o.err = err return n, err } o.buf = o.buf[:n] o.freshRead = false } if len(buf) >= len(o.buf) { n = copy(buf, o.buf) o.freshRead = true return n, nil } n = copy(buf, o.buf) o.buf = o.buf[n:] return n, nil } // Close - Release the buffer and close the file. func (o *odirectReader) Close() error { if o.smallFile { o.s.poolSmall.Put(o.bufp) } else { o.s.poolLarge.Put(o.bufp) } defer func() { atomic.AddInt32(&o.s.activeIOCount, -1) }() return o.f.Close() } // ReadFileStream - Returns the read stream of the file. func (s *xlStorage) ReadFileStream(ctx context.Context, volume, path string, offset, length int64) (io.ReadCloser, error) { if offset < 0 { return nil, errInvalidArgument } volumeDir, err := s.getVolDir(volume) if err != nil { return nil, err } // Validate effective path length before reading. filePath := pathJoin(volumeDir, path) if err = checkPathLength(filePath); err != nil { return nil, err } var file *os.File // O_DIRECT only supported if offset is zero if offset == 0 && globalStorageClass.GetDMA() == storageclass.DMAReadWrite { file, err = disk.OpenFileDirectIO(filePath, os.O_RDONLY, 0666) } else { // Open the file for reading. file, err = os.Open(filePath) } if err != nil { switch { case osIsNotExist(err): _, err = os.Stat(volumeDir) if err != nil && osIsNotExist(err) { return nil, errVolumeNotFound } return nil, errFileNotFound case osIsPermission(err): return nil, errFileAccessDenied case isSysErrNotDir(err): return nil, errFileAccessDenied case isSysErrIO(err): return nil, errFaultyDisk case isSysErrTooManyFiles(err): return nil, errTooManyOpenFiles default: return nil, err } } st, err := file.Stat() if err != nil { return nil, err } // Verify it is a regular file, otherwise subsequent Seek is // undefined. if !st.Mode().IsRegular() { return nil, errIsNotRegular } atomic.AddInt32(&s.activeIOCount, 1) if offset == 0 && globalStorageClass.GetDMA() == storageclass.DMAReadWrite { if length <= smallFileThreshold { return &odirectReader{file, nil, nil, true, true, s, nil}, nil } return &odirectReader{file, nil, nil, true, false, s, nil}, nil } if offset > 0 { if _, err = file.Seek(offset, io.SeekStart); err != nil { return nil, err } } r := struct { io.Reader io.Closer }{Reader: io.LimitReader(file, length), Closer: closeWrapper(func() error { defer func() { atomic.AddInt32(&s.activeIOCount, -1) }() return file.Close() })} // Add readahead to big reads if length >= readAheadSize { rc, err := readahead.NewReadCloserSize(r, readAheadBuffers, readAheadBufSize) if err != nil { r.Close() return nil, err } return rc, nil } // Just add a small 64k buffer. r.Reader = bufio.NewReaderSize(r.Reader, 64<<10) return r, nil } // closeWrapper converts a function to an io.Closer type closeWrapper func() error // Close calls the wrapped function. func (c closeWrapper) Close() error { return c() } // CreateFile - creates the file. func (s *xlStorage) CreateFile(ctx context.Context, volume, path string, fileSize int64, r io.Reader) (err error) { if fileSize < -1 { return errInvalidArgument } atomic.AddInt32(&s.activeIOCount, 1) defer func() { atomic.AddInt32(&s.activeIOCount, -1) }() volumeDir, err := s.getVolDir(volume) if err != nil { return err } // Stat a volume entry. _, err = os.Stat(volumeDir) if err != nil { if osIsNotExist(err) { return errVolumeNotFound } else if isSysErrIO(err) { return errFaultyDisk } return err } filePath := pathJoin(volumeDir, path) if err = checkPathLength(filePath); err != nil { return err } // Create top level directories if they don't exist. // with mode 0777 mkdir honors system umask. if err = mkdirAll(slashpath.Dir(filePath), 0777); err != nil { switch { case osIsPermission(err): return errFileAccessDenied case osIsExist(err): return errFileAccessDenied case isSysErrIO(err): return errFaultyDisk case isSysErrInvalidArg(err): return errUnsupportedDisk case isSysErrNoSpace(err): return errDiskFull } return err } w, err := disk.OpenFileDirectIO(filePath, os.O_CREATE|os.O_WRONLY|os.O_EXCL, 0666) if err != nil { switch { case osIsPermission(err): return errFileAccessDenied case osIsExist(err): return errFileAccessDenied case isSysErrIO(err): return errFaultyDisk case isSysErrInvalidArg(err): return errUnsupportedDisk case isSysErrNoSpace(err): return errDiskFull default: return err } } var e error if fileSize > 0 { // Allocate needed disk space to append data e = Fallocate(int(w.Fd()), 0, fileSize) } // Ignore errors when Fallocate is not supported in the current system if e != nil && !isSysErrNoSys(e) && !isSysErrOpNotSupported(e) { switch { case isSysErrNoSpace(e): err = errDiskFull case isSysErrIO(e): err = errFaultyDisk default: // For errors: EBADF, EINTR, EINVAL, ENODEV, EPERM, ESPIPE and ETXTBSY // Appending was failed anyway, returns unexpected error err = errUnexpected } return err } defer func() { disk.Fdatasync(w) // Only interested in flushing the size_t not mtime/atime w.Close() }() var bufp *[]byte if fileSize <= smallFileThreshold { bufp = s.poolSmall.Get().(*[]byte) defer s.poolSmall.Put(bufp) } else { bufp = s.poolLarge.Get().(*[]byte) defer s.poolLarge.Put(bufp) } written, err := xioutil.CopyAligned(w, r, *bufp, fileSize) if err != nil { return err } if written < fileSize { return errLessData } else if written > fileSize { return errMoreData } return nil } func (s *xlStorage) WriteAll(ctx context.Context, volume string, path string, b []byte) (err error) { atomic.AddInt32(&s.activeIOCount, 1) defer func() { atomic.AddInt32(&s.activeIOCount, -1) }() w, err := s.openFile(volume, path, os.O_CREATE|os.O_SYNC|os.O_WRONLY) if err != nil { return err } defer w.Close() n, err := w.Write(b) if err != nil { return err } if n != len(b) { return io.ErrShortWrite } return nil } // AppendFile - append a byte array at path, if file doesn't exist at // path this call explicitly creates it. func (s *xlStorage) AppendFile(ctx context.Context, volume string, path string, buf []byte) (err error) { atomic.AddInt32(&s.activeIOCount, 1) defer func() { atomic.AddInt32(&s.activeIOCount, -1) }() var w *os.File // Create file if not found. Not doing O_DIRECT here to avoid the code that does buffer aligned writes. // AppendFile() is only used by healing code to heal objects written in old format. w, err = s.openFile(volume, path, os.O_CREATE|os.O_SYNC|os.O_APPEND|os.O_WRONLY) if err != nil { return err } if _, err = w.Write(buf); err != nil { return err } return w.Close() } // CheckParts check if path has necessary parts available. func (s *xlStorage) CheckParts(ctx context.Context, volume string, path string, fi FileInfo) error { atomic.AddInt32(&s.activeIOCount, 1) defer func() { atomic.AddInt32(&s.activeIOCount, -1) }() volumeDir, err := s.getVolDir(volume) if err != nil { return err } // Stat a volume entry. if _, err = os.Stat(volumeDir); err != nil { if osIsNotExist(err) { return errVolumeNotFound } return err } for _, part := range fi.Parts { partPath := pathJoin(path, fi.DataDir, fmt.Sprintf("part.%d", part.Number)) if fi.XLV1 { partPath = pathJoin(path, fmt.Sprintf("part.%d", part.Number)) } filePath := pathJoin(volumeDir, partPath) if err = checkPathLength(filePath); err != nil { return err } st, err := os.Stat(filePath) if err != nil { return osErrToFileErr(err) } if st.Mode().IsDir() { return errFileNotFound } // Check if shard is truncated. if st.Size() < fi.Erasure.ShardFileSize(part.Size) { return errFileCorrupt } } return nil } // CheckFile check if path has necessary metadata. // This function does the following check, suppose // you are creating a metadata file at "a/b/c/d/xl.meta", // makes sure that there is no `xl.meta` at // - "a/b/c/" // - "a/b/" // - "a/" func (s *xlStorage) CheckFile(ctx context.Context, volume string, path string) error { atomic.AddInt32(&s.activeIOCount, 1) defer func() { atomic.AddInt32(&s.activeIOCount, -1) }() volumeDir, err := s.getVolDir(volume) if err != nil { return err } var checkFile func(p string) error checkFile = func(p string) error { if p == "." || p == SlashSeparator { return errPathNotFound } filePath := pathJoin(volumeDir, p, xlStorageFormatFile) if err := checkPathLength(filePath); err != nil { return err } st, _ := os.Lstat(filePath) if st == nil { if s.formatLegacy { filePathOld := pathJoin(volumeDir, p, xlStorageFormatFileV1) if err := checkPathLength(filePathOld); err != nil { return err } st, _ = os.Lstat(filePathOld) if st == nil { return errPathNotFound } } } if st != nil { if !st.Mode().IsRegular() { // not a regular file return error. return errFileNotFound } // Success fully found return nil } return checkFile(slashpath.Dir(p)) } return checkFile(path) } // deleteFile deletes a file or a directory if its empty unless recursive // is set to true. If the target is successfully deleted, it will recursively // move up the tree, deleting empty parent directories until it finds one // with files in it. Returns nil for a non-empty directory even when // recursive is set to false. func deleteFile(basePath, deletePath string, recursive bool) error { if basePath == "" || deletePath == "" { return nil } isObjectDir := HasSuffix(deletePath, SlashSeparator) basePath = slashpath.Clean(basePath) deletePath = slashpath.Clean(deletePath) if !strings.HasPrefix(deletePath, basePath) || deletePath == basePath { return nil } var err error if recursive { err = os.RemoveAll(deletePath) } else { err = os.Remove(deletePath) } if err != nil { switch { case isSysErrNotEmpty(err): // if object is a directory, but if its not empty // return FileNotFound to indicate its an empty prefix. if isObjectDir { return errFileNotFound } // Ignore errors if the directory is not empty. The server relies on // this functionality, and sometimes uses recursion that should not // error on parent directories. return nil case osIsNotExist(err): return errFileNotFound case osIsPermission(err): return errFileAccessDenied case isSysErrIO(err): return errFaultyDisk default: return err } } deletePath = slashpath.Dir(deletePath) // Delete parent directory obviously not recursively. Errors for // parent directories shouldn't trickle down. deleteFile(basePath, deletePath, false) return nil } // DeleteFile - delete a file at path. func (s *xlStorage) Delete(ctx context.Context, volume string, path string, recursive bool) (err error) { atomic.AddInt32(&s.activeIOCount, 1) defer func() { atomic.AddInt32(&s.activeIOCount, -1) }() volumeDir, err := s.getVolDir(volume) if err != nil { return err } // Stat a volume entry. _, err = os.Stat(volumeDir) if err != nil { if osIsNotExist(err) { return errVolumeNotFound } else if osIsPermission(err) { return errVolumeAccessDenied } else if isSysErrIO(err) { return errFaultyDisk } return err } // Following code is needed so that we retain SlashSeparator suffix if any in // path argument. filePath := pathJoin(volumeDir, path) if err = checkPathLength(filePath); err != nil { return err } // Delete file and delete parent directory as well if it's empty. return deleteFile(volumeDir, filePath, recursive) } func (s *xlStorage) DeleteFileBulk(volume string, paths []string) (errs []error, err error) { atomic.AddInt32(&s.activeIOCount, 1) defer func() { atomic.AddInt32(&s.activeIOCount, -1) }() volumeDir, err := s.getVolDir(volume) if err != nil { return nil, err } // Stat a volume entry. _, err = os.Stat(volumeDir) if err != nil { if osIsNotExist(err) { return nil, errVolumeNotFound } else if osIsPermission(err) { return nil, errVolumeAccessDenied } else if isSysErrIO(err) { return nil, errFaultyDisk } return nil, err } errs = make([]error, len(paths)) // Following code is needed so that we retain SlashSeparator // suffix if any in path argument. for idx, path := range paths { filePath := pathJoin(volumeDir, path) errs[idx] = checkPathLength(filePath) if errs[idx] != nil { continue } // Delete file and delete parent directory as well if its empty. errs[idx] = deleteFile(volumeDir, filePath, false) } return } // RenameData - rename source path to destination path atomically, metadata and data directory. func (s *xlStorage) RenameData(ctx context.Context, srcVolume, srcPath, dataDir, dstVolume, dstPath string) (err error) { atomic.AddInt32(&s.activeIOCount, 1) defer func() { atomic.AddInt32(&s.activeIOCount, -1) }() srcVolumeDir, err := s.getVolDir(srcVolume) if err != nil { return err } dstVolumeDir, err := s.getVolDir(dstVolume) if err != nil { return err } // Stat a volume entry. _, err = os.Stat(srcVolumeDir) if err != nil { if osIsNotExist(err) { return errVolumeNotFound } else if isSysErrIO(err) { return errFaultyDisk } return err } _, err = os.Stat(dstVolumeDir) if err != nil { if osIsNotExist(err) { return errVolumeNotFound } else if isSysErrIO(err) { return errFaultyDisk } return err } srcFilePath := slashpath.Join(srcVolumeDir, pathJoin(srcPath, xlStorageFormatFile)) dstFilePath := slashpath.Join(dstVolumeDir, pathJoin(dstPath, xlStorageFormatFile)) var srcDataPath string var dstDataPath string if dataDir != "" { srcDataPath = retainSlash(pathJoin(srcVolumeDir, srcPath, dataDir)) // make sure to always use path.Join here, do not use pathJoin as // it would additionally add `/` at the end and it comes in the // way of renameAll(), parentDir creation. dstDataPath = slashpath.Join(dstVolumeDir, dstPath, dataDir) } if err = checkPathLength(srcFilePath); err != nil { return err } if err = checkPathLength(dstFilePath); err != nil { return err } srcBuf, err := ioutil.ReadFile(srcFilePath) if err != nil { return osErrToFileErr(err) } fi, err := getFileInfo(srcBuf, dstVolume, dstPath, "") if err != nil { return err } dstBuf, err := ioutil.ReadFile(dstFilePath) if err != nil { if !osIsNotExist(err) { return osErrToFileErr(err) } // errFileNotFound comes here. err = s.renameLegacyMetadata(dstVolumeDir, dstPath) if err != nil && err != errFileNotFound { return err } if err == nil { dstBuf, err = ioutil.ReadFile(dstFilePath) if err != nil && !osIsNotExist(err) { return osErrToFileErr(err) } } if err == errFileNotFound { // Verification to ensure that we // don't have objects already created // at this location, verify that resultant // directories don't have any unexpected // directories that we do not understand // or expect. If its already there we should // make sure to reject further renames // for such objects. // // This elaborate check is necessary to avoid // scenarios such as these. // // bucket1/name1/obj1/xl.meta // bucket1/name1/xl.meta --> this should never // be allowed. { entries, err := readDirN(path.Dir(dstFilePath), 1) if err != nil && err != errFileNotFound { return err } if len(entries) > 0 { entry := path.Clean(entries[0]) if entry != legacyDataDir { _, uerr := uuid.Parse(entry) if uerr != nil { return errFileParentIsFile } } } } } } var xlMeta xlMetaV2 var legacyPreserved bool if len(dstBuf) > 0 { if isXL2V1Format(dstBuf) { if err = xlMeta.Load(dstBuf); err != nil { logger.LogIf(s.ctx, err) return errFileCorrupt } } else { // This code-path is to preserve the legacy data. xlMetaLegacy := &xlMetaV1Object{} var json = jsoniter.ConfigCompatibleWithStandardLibrary if err := json.Unmarshal(dstBuf, xlMetaLegacy); err != nil { logger.LogIf(s.ctx, err) return errFileCorrupt } if err = xlMeta.AddLegacy(xlMetaLegacy); err != nil { logger.LogIf(s.ctx, err) return errFileCorrupt } legacyPreserved = true } } else { // It is possible that some drives may not have `xl.meta` file // in such scenarios verify if atleast `part.1` files exist // to verify for legacy version. currentDataPath := pathJoin(dstVolumeDir, dstPath) entries, err := readDirN(currentDataPath, 1) if err != nil && err != errFileNotFound { return osErrToFileErr(err) } for _, entry := range entries { if entry == xlStorageFormatFile || strings.HasSuffix(entry, slashSeparator) { continue } if strings.HasPrefix(entry, "part.") { legacyPreserved = true break } } } if legacyPreserved { // Preserve all the legacy data, could be slow, but at max there can be 10,000 parts. currentDataPath := pathJoin(dstVolumeDir, dstPath) entries, err := readDir(currentDataPath) if err != nil { return osErrToFileErr(err) } legacyDataPath := pathJoin(dstVolumeDir, dstPath, legacyDataDir) // legacy data dir means its old content, honor system umask. if err = os.MkdirAll(legacyDataPath, 0777); err != nil { return osErrToFileErr(err) } if s.globalSync { // Sync all the previous directory operations. globalSync() } for _, entry := range entries { // Skip xl.meta renames further, also ignore any directories such as `legacyDataDir` if entry == xlStorageFormatFile || strings.HasSuffix(entry, slashSeparator) { continue } if err = os.Rename(pathJoin(currentDataPath, entry), pathJoin(legacyDataPath, entry)); err != nil { return osErrToFileErr(err) } } // Sync all the metadata operations once renames are done. if s.globalSync { globalSync() } } var oldDstDataPath string if fi.VersionID == "" { // return the latest "null" versionId info ofi, err := xlMeta.ToFileInfo(dstVolume, dstPath, nullVersionID) if err == nil && !ofi.Deleted { // Purge the destination path as we are not preserving anything // versioned object was not requested. oldDstDataPath = pathJoin(dstVolumeDir, dstPath, ofi.DataDir) } } if err = xlMeta.AddVersion(fi); err != nil { return err } dstBuf, err = xlMeta.MarshalMsg(append(xlHeader[:], xlVersionV1[:]...)) if err != nil { return errFileCorrupt } if err = s.WriteAll(ctx, srcVolume, pathJoin(srcPath, xlStorageFormatFile), dstBuf); err != nil { return err } // Commit data if srcDataPath != "" { removeAll(oldDstDataPath) removeAll(dstDataPath) if err = renameAll(srcDataPath, dstDataPath); err != nil { return osErrToFileErr(err) } } // Commit meta-file if err = renameAll(srcFilePath, dstFilePath); err != nil { return osErrToFileErr(err) } // Remove parent dir of the source file if empty if parentDir := slashpath.Dir(srcFilePath); isDirEmpty(parentDir) { deleteFile(srcVolumeDir, parentDir, false) } if srcDataPath != "" { if parentDir := slashpath.Dir(srcDataPath); isDirEmpty(parentDir) { deleteFile(srcVolumeDir, parentDir, false) } } return nil } // RenameFile - rename source path to destination path atomically. func (s *xlStorage) RenameFile(ctx context.Context, srcVolume, srcPath, dstVolume, dstPath string) (err error) { atomic.AddInt32(&s.activeIOCount, 1) defer func() { atomic.AddInt32(&s.activeIOCount, -1) }() srcVolumeDir, err := s.getVolDir(srcVolume) if err != nil { return err } dstVolumeDir, err := s.getVolDir(dstVolume) if err != nil { return err } // Stat a volume entry. _, err = os.Stat(srcVolumeDir) if err != nil { if osIsNotExist(err) { return errVolumeNotFound } else if isSysErrIO(err) { return errFaultyDisk } return err } _, err = os.Stat(dstVolumeDir) if err != nil { if osIsNotExist(err) { return errVolumeNotFound } else if isSysErrIO(err) { return errFaultyDisk } return err } srcIsDir := HasSuffix(srcPath, SlashSeparator) dstIsDir := HasSuffix(dstPath, SlashSeparator) // Either src and dst have to be directories or files, else return error. if !(srcIsDir && dstIsDir || !srcIsDir && !dstIsDir) { return errFileAccessDenied } srcFilePath := slashpath.Join(srcVolumeDir, srcPath) if err = checkPathLength(srcFilePath); err != nil { return err } dstFilePath := slashpath.Join(dstVolumeDir, dstPath) if err = checkPathLength(dstFilePath); err != nil { return err } if srcIsDir { // If source is a directory, we expect the destination to be non-existent but we // we still need to allow overwriting an empty directory since it represents // an object empty directory. _, err = os.Stat(dstFilePath) if isSysErrIO(err) { return errFaultyDisk } if err == nil && !isDirEmpty(dstFilePath) { return errFileAccessDenied } if err != nil && !osIsNotExist(err) { return err } // Empty destination remove it before rename. if isDirEmpty(dstFilePath) { if err = os.Remove(dstFilePath); err != nil { if isSysErrNotEmpty(err) { return errFileAccessDenied } return err } } } if err = renameAll(srcFilePath, dstFilePath); err != nil { return osErrToFileErr(err) } // Remove parent dir of the source file if empty if parentDir := slashpath.Dir(srcFilePath); isDirEmpty(parentDir) { deleteFile(srcVolumeDir, parentDir, false) } return nil } func (s *xlStorage) bitrotVerify(partPath string, partSize int64, algo BitrotAlgorithm, sum []byte, shardSize int64) error { // Open the file for reading. file, err := os.Open(partPath) if err != nil { return osErrToFileErr(err) } // Close the file descriptor. defer file.Close() if algo != HighwayHash256S { h := algo.New() if _, err = io.Copy(h, file); err != nil { // Premature failure in reading the object,file is corrupt. return errFileCorrupt } if !bytes.Equal(h.Sum(nil), sum) { return errFileCorrupt } return nil } buf := make([]byte, shardSize) h := algo.New() hashBuf := make([]byte, h.Size()) fi, err := file.Stat() if err != nil { // Unable to stat on the file, return an expected error // for healing code to fix this file. return err } size := fi.Size() // Calculate the size of the bitrot file and compare // it with the actual file size. if size != bitrotShardFileSize(partSize, shardSize, algo) { return errFileCorrupt } var n int for { if size == 0 { return nil } h.Reset() n, err = file.Read(hashBuf) if err != nil { // Read's failed for object with right size, file is corrupt. return err } size -= int64(n) if size < int64(len(buf)) { buf = buf[:size] } n, err = file.Read(buf) if err != nil { // Read's failed for object with right size, at different offsets. return err } size -= int64(n) h.Write(buf) if !bytes.Equal(h.Sum(nil), hashBuf) { return errFileCorrupt } } } func (s *xlStorage) VerifyFile(ctx context.Context, volume, path string, fi FileInfo) (err error) { atomic.AddInt32(&s.activeIOCount, 1) defer func() { atomic.AddInt32(&s.activeIOCount, -1) }() volumeDir, err := s.getVolDir(volume) if err != nil { return err } // Stat a volume entry. _, err = os.Stat(volumeDir) if err != nil { if osIsNotExist(err) { return errVolumeNotFound } else if isSysErrIO(err) { return errFaultyDisk } else if osIsPermission(err) { return errVolumeAccessDenied } return err } erasure := fi.Erasure for _, part := range fi.Parts { checksumInfo := erasure.GetChecksumInfo(part.Number) partPath := pathJoin(volumeDir, path, fi.DataDir, fmt.Sprintf("part.%d", part.Number)) if fi.XLV1 { partPath = pathJoin(volumeDir, path, fmt.Sprintf("part.%d", part.Number)) } if err := s.bitrotVerify(partPath, erasure.ShardFileSize(part.Size), checksumInfo.Algorithm, checksumInfo.Hash, erasure.ShardSize()); err != nil { if !IsErr(err, []error{ errFileNotFound, errVolumeNotFound, errFileCorrupt, }...) { logger.GetReqInfo(s.ctx).AppendTags("disk", s.String()) logger.LogIf(s.ctx, err) } return err } } return nil }