package storage import ( "fmt" "os" "time" "github.com/chrislusf/seaweedfs/weed/glog" ) func loadVolumeWithoutIndex(dirname string, collection string, id VolumeId, needleMapKind NeedleMapType) (v *Volume, e error) { v = &Volume{dir: dirname, Collection: collection, Id: id} v.SuperBlock = SuperBlock{} v.needleMapKind = needleMapKind e = v.load(false, false, needleMapKind, 0) return } func (v *Volume) load(alsoLoadIndex bool, createDatIfMissing bool, needleMapKind NeedleMapType, preallocate int64) error { var e error fileName := v.FileName() alreadyHasSuperBlock := false if exists, canRead, canWrite, modifiedTime, fileSize := checkFile(fileName + ".dat"); exists { if !canRead { return fmt.Errorf("cannot read Volume Data file %s.dat", fileName) } if canWrite { v.dataFile, e = os.OpenFile(fileName+".dat", os.O_RDWR|os.O_CREATE, 0644) v.lastModifiedTime = uint64(modifiedTime.Unix()) } else { glog.V(0).Infoln("opening " + fileName + ".dat in READONLY mode") v.dataFile, e = os.Open(fileName + ".dat") v.readOnly = true } if fileSize >= _SuperBlockSize { alreadyHasSuperBlock = true } } else { if createDatIfMissing { v.dataFile, e = createVolumeFile(fileName+".dat", preallocate) } else { return fmt.Errorf("Volume Data file %s.dat does not exist.", fileName) } } if e != nil { if !os.IsPermission(e) { return fmt.Errorf("cannot load Volume Data %s.dat: %v", fileName, e) } else { return fmt.Errorf("load data file %s.dat: %v", fileName, e) } } if alreadyHasSuperBlock { e = v.readSuperBlock() } else { e = v.maybeWriteSuperBlock() } if e == nil && alsoLoadIndex { var indexFile *os.File if v.readOnly { glog.V(1).Infoln("open to read file", fileName+".idx") if indexFile, e = os.OpenFile(fileName+".idx", os.O_RDONLY, 0644); e != nil { return fmt.Errorf("cannot read Volume Index %s.idx: %v", fileName, e) } } else { glog.V(1).Infoln("open to write file", fileName+".idx") if indexFile, e = os.OpenFile(fileName+".idx", os.O_RDWR|os.O_CREATE, 0644); e != nil { return fmt.Errorf("cannot write Volume Index %s.idx: %v", fileName, e) } } if e = CheckVolumeDataIntegrity(v, indexFile); e != nil { v.readOnly = true glog.V(0).Infof("volumeDataIntegrityChecking failed %v", e) } switch needleMapKind { case NeedleMapInMemory: glog.V(0).Infoln("loading index", fileName+".idx", "to memory readonly", v.readOnly) if v.nm, e = LoadCompactNeedleMap(indexFile); e != nil { glog.V(0).Infof("loading index %s to memory error: %v", fileName+".idx", e) } case NeedleMapLevelDb: glog.V(0).Infoln("loading leveldb", fileName+".ldb") if v.nm, e = NewLevelDbNeedleMap(fileName+".ldb", indexFile); e != nil { glog.V(0).Infof("loading leveldb %s error: %v", fileName+".ldb", e) } case NeedleMapBoltDb: glog.V(0).Infoln("loading boltdb", fileName+".bdb") if v.nm, e = NewBoltDbNeedleMap(fileName+".bdb", indexFile); e != nil { glog.V(0).Infof("loading boltdb %s error: %v", fileName+".bdb", e) } case NeedleMapBtree: glog.V(0).Infoln("loading index", fileName+".idx", "to btree readonly", v.readOnly) if v.nm, e = LoadBtreeNeedleMap(indexFile); e != nil { glog.V(0).Infof("loading index %s to btree error: %v", fileName+".idx", e) } } } return e } func checkFile(filename string) (exists, canRead, canWrite bool, modTime time.Time, fileSize int64) { exists = true fi, err := os.Stat(filename) if os.IsNotExist(err) { exists = false return } if fi.Mode()&0400 != 0 { canRead = true } if fi.Mode()&0200 != 0 { canWrite = true } modTime = fi.ModTime() fileSize = fi.Size() return }