package storage import ( "fmt" "os" "github.com/chrislusf/seaweedfs/weed/util" ) func CheckVolumeDataIntegrity(v *Volume, indexFile *os.File) error { var indexSize int64 var e error if indexSize, e = verifyIndexFileIntegrity(indexFile); e != nil { return fmt.Errorf("verifyIndexFileIntegrity %s failed: %v", indexFile.Name(), e) } if indexSize == 0 { return nil } var lastIdxEntry []byte if lastIdxEntry, e = readIndexEntryAtOffset(indexFile, indexSize-NeedleIndexSize); e != nil { return fmt.Errorf("readLastIndexEntry %s failed: %v", indexFile.Name(), e) } key, offset, size := idxFileEntry(lastIdxEntry) //deleted index entry could not point to deleted needle if offset == 0 { return nil } if e = verifyNeedleIntegrity(v.dataFile, v.Version(), int64(offset)*NeedlePaddingSize, key, size); e != nil { return fmt.Errorf("verifyNeedleIntegrity %s failed: %v", indexFile.Name(), e) } return nil } func verifyIndexFileIntegrity(indexFile *os.File) (indexSize int64, err error) { if indexSize, err = util.GetFileSize(indexFile); err == nil { if indexSize%NeedleIndexSize != 0 { err = fmt.Errorf("index file's size is %d bytes, maybe corrupted", indexSize) } } return } func readIndexEntryAtOffset(indexFile *os.File, offset int64) (bytes []byte, err error) { if offset < 0 { err = fmt.Errorf("offset %d for index file is invalid", offset) return } bytes = make([]byte, NeedleIndexSize) _, err = indexFile.ReadAt(bytes, offset) return } func verifyNeedleIntegrity(datFile *os.File, v Version, offset int64, key uint64, size uint32) error { n := new(Needle) err := n.ReadData(datFile, offset, size, v) if err != nil { return err } if n.Id != key { return fmt.Errorf("index key %#x does not match needle's Id %#x", key, n.Id) } return nil }