package filesys import ( "context" "fmt" "io" "math" "net/http" "os" "sync" "time" "github.com/seaweedfs/fuse" "github.com/seaweedfs/fuse/fs" "github.com/chrislusf/seaweedfs/weed/filer" "github.com/chrislusf/seaweedfs/weed/glog" "github.com/chrislusf/seaweedfs/weed/pb/filer_pb" ) type FileHandle struct { // cache file has been written to dirtyPages *PageWriter entryViewCache []filer.VisibleInterval reader io.ReaderAt contentType string handle uint64 sync.Mutex f *File NodeId fuse.NodeID // file or directory the request is about Uid uint32 // user ID of process making request Gid uint32 // group ID of process making request isDeleted bool } func newFileHandle(file *File, uid, gid uint32) *FileHandle { fh := &FileHandle{ f: file, Uid: uid, Gid: gid, } // dirtyPages: newContinuousDirtyPages(file, writeOnly), fh.dirtyPages = newPageWriter(fh, file.wfs.option.ChunkSizeLimit) entry := fh.f.getEntry() if entry != nil { entry.Attributes.FileSize = filer.FileSize(entry) } return fh } var _ = fs.Handle(&FileHandle{}) // var _ = fs.HandleReadAller(&FileHandle{}) var _ = fs.HandleReader(&FileHandle{}) var _ = fs.HandleFlusher(&FileHandle{}) var _ = fs.HandleWriter(&FileHandle{}) var _ = fs.HandleReleaser(&FileHandle{}) func (fh *FileHandle) Read(ctx context.Context, req *fuse.ReadRequest, resp *fuse.ReadResponse) error { fh.Lock() defer fh.Unlock() glog.V(4).Infof("%s read fh %d: [%d,%d) size %d resp.Data cap=%d", fh.f.fullpath(), fh.handle, req.Offset, req.Offset+int64(req.Size), req.Size, cap(resp.Data)) if req.Size <= 0 { return nil } buff := resp.Data[:cap(resp.Data)] if req.Size > cap(resp.Data) { // should not happen buff = make([]byte, req.Size) } fh.lockForRead(req.Offset, len(buff)) defer fh.unlockForRead(req.Offset, len(buff)) totalRead, err := fh.readFromChunks(buff, req.Offset) if err == nil || err == io.EOF { maxStop := fh.readFromDirtyPages(buff, req.Offset) totalRead = max(maxStop-req.Offset, totalRead) } if err == io.EOF { err = nil } if err != nil { glog.Warningf("file handle read %s %d: %v", fh.f.fullpath(), totalRead, err) return fuse.EIO } if totalRead > int64(len(buff)) { glog.Warningf("%s FileHandle Read %d: [%d,%d) size %d totalRead %d", fh.f.fullpath(), fh.handle, req.Offset, req.Offset+int64(req.Size), req.Size, totalRead) totalRead = min(int64(len(buff)), totalRead) } if err == nil { resp.Data = buff[:totalRead] } return err } func (fh *FileHandle) lockForRead(startOffset int64, size int) { fh.dirtyPages.LockForRead(startOffset, startOffset+int64(size)) } func (fh *FileHandle) unlockForRead(startOffset int64, size int) { fh.dirtyPages.UnlockForRead(startOffset, startOffset+int64(size)) } func (fh *FileHandle) readFromDirtyPages(buff []byte, startOffset int64) (maxStop int64) { maxStop = fh.dirtyPages.ReadDirtyDataAt(buff, startOffset) return } func (fh *FileHandle) readFromChunks(buff []byte, offset int64) (int64, error) { entry := fh.f.getEntry() if entry == nil { return 0, io.EOF } if entry.IsInRemoteOnly() { glog.V(4).Infof("download remote entry %s", fh.f.fullpath()) newEntry, err := fh.f.downloadRemoteEntry(entry) if err != nil { glog.V(1).Infof("download remote entry %s: %v", fh.f.fullpath(), err) return 0, err } entry = newEntry } fileSize := int64(filer.FileSize(entry)) fileFullPath := fh.f.fullpath() if fileSize == 0 { glog.V(1).Infof("empty fh %v", fileFullPath) return 0, io.EOF } if offset+int64(len(buff)) <= int64(len(entry.Content)) { totalRead := copy(buff, entry.Content[offset:]) glog.V(4).Infof("file handle read cached %s [%d,%d] %d", fileFullPath, offset, offset+int64(totalRead), totalRead) return int64(totalRead), nil } var chunkResolveErr error if fh.entryViewCache == nil { fh.entryViewCache, chunkResolveErr = filer.NonOverlappingVisibleIntervals(fh.f.wfs.LookupFn(), entry.Chunks, 0, math.MaxInt64) if chunkResolveErr != nil { return 0, fmt.Errorf("fail to resolve chunk manifest: %v", chunkResolveErr) } fh.reader = nil } reader := fh.reader if reader == nil { chunkViews := filer.ViewFromVisibleIntervals(fh.entryViewCache, 0, math.MaxInt64) glog.V(4).Infof("file handle read %s [%d,%d) from %d views", fileFullPath, offset, offset+int64(len(buff)), len(chunkViews)) for _, chunkView := range chunkViews { glog.V(4).Infof(" read %s [%d,%d) from chunk %+v", fileFullPath, chunkView.LogicOffset, chunkView.LogicOffset+int64(chunkView.Size), chunkView.FileId) } reader = filer.NewChunkReaderAtFromClient(fh.f.wfs.LookupFn(), chunkViews, fh.f.wfs.chunkCache, fileSize) } fh.reader = reader totalRead, err := reader.ReadAt(buff, offset) if err != nil && err != io.EOF { glog.Errorf("file handle read %s: %v", fileFullPath, err) } glog.V(4).Infof("file handle read %s [%d,%d] %d : %v", fileFullPath, offset, offset+int64(totalRead), totalRead, err) return int64(totalRead), err } // Write to the file handle func (fh *FileHandle) Write(ctx context.Context, req *fuse.WriteRequest, resp *fuse.WriteResponse) error { fh.dirtyPages.writerPattern.MonitorWriteAt(req.Offset, len(req.Data)) fh.Lock() defer fh.Unlock() // write the request to volume servers data := req.Data if len(data) <= 512 && req.Offset == 0 { // fuse message cacheable size data = make([]byte, len(req.Data)) copy(data, req.Data) } entry := fh.f.getEntry() if entry == nil { return fuse.EIO } entry.Content = nil entry.Attributes.FileSize = uint64(max(req.Offset+int64(len(data)), int64(entry.Attributes.FileSize))) // glog.V(4).Infof("%v write [%d,%d) %d", fh.f.fullpath(), req.Offset, req.Offset+int64(len(req.Data)), len(req.Data)) fh.dirtyPages.AddPage(req.Offset, data) resp.Size = len(data) if req.Offset == 0 { // detect mime type fh.contentType = http.DetectContentType(data) fh.f.dirtyMetadata = true } fh.f.dirtyMetadata = true return nil } func (fh *FileHandle) Release(ctx context.Context, req *fuse.ReleaseRequest) error { glog.V(4).Infof("Release %v fh %d open=%d", fh.f.fullpath(), fh.handle, fh.f.isOpen) fh.f.wfs.handlesLock.Lock() fh.f.isOpen-- fh.f.wfs.handlesLock.Unlock() if fh.f.isOpen <= 0 { fh.f.entry = nil fh.entryViewCache = nil fh.reader = nil fh.f.wfs.ReleaseHandle(fh.f.fullpath(), fuse.HandleID(fh.handle)) fh.dirtyPages.Destroy() } if fh.f.isOpen < 0 { glog.V(0).Infof("Release reset %s open count %d => %d", fh.f.Name, fh.f.isOpen, 0) fh.f.isOpen = 0 return nil } return nil } func (fh *FileHandle) Flush(ctx context.Context, req *fuse.FlushRequest) error { glog.V(4).Infof("Flush %v fh %d", fh.f.fullpath(), fh.handle) if fh.isDeleted { glog.V(4).Infof("Flush %v fh %d skip deleted", fh.f.fullpath(), fh.handle) return nil } fh.Lock() defer fh.Unlock() if err := fh.doFlush(ctx, req.Header); err != nil { glog.Errorf("Flush doFlush %s: %v", fh.f.Name, err) return err } return nil } func (fh *FileHandle) doFlush(ctx context.Context, header fuse.Header) error { // flush works at fh level // send the data to the OS glog.V(4).Infof("doFlush %s fh %d", fh.f.fullpath(), fh.handle) if err := fh.dirtyPages.FlushData(); err != nil { glog.Errorf("%v doFlush: %v", fh.f.fullpath(), err) return fuse.EIO } if !fh.f.dirtyMetadata { return nil } err := fh.f.wfs.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error { entry := fh.f.getEntry() if entry == nil { return nil } if entry.Attributes != nil { entry.Attributes.Mime = fh.contentType if entry.Attributes.Uid == 0 { entry.Attributes.Uid = header.Uid } if entry.Attributes.Gid == 0 { entry.Attributes.Gid = header.Gid } if entry.Attributes.Crtime == 0 { entry.Attributes.Crtime = time.Now().Unix() } entry.Attributes.Mtime = time.Now().Unix() entry.Attributes.FileMode = uint32(os.FileMode(entry.Attributes.FileMode) &^ fh.f.wfs.option.Umask) entry.Attributes.Collection, entry.Attributes.Replication = fh.dirtyPages.GetStorageOptions() } request := &filer_pb.CreateEntryRequest{ Directory: fh.f.dir.FullPath(), Entry: entry, Signatures: []int32{fh.f.wfs.signature}, } glog.V(4).Infof("%s set chunks: %v", fh.f.fullpath(), len(entry.Chunks)) for i, chunk := range entry.Chunks { glog.V(4).Infof("%s chunks %d: %v [%d,%d)", fh.f.fullpath(), i, chunk.GetFileIdString(), chunk.Offset, chunk.Offset+int64(chunk.Size)) } manifestChunks, nonManifestChunks := filer.SeparateManifestChunks(entry.Chunks) chunks, _ := filer.CompactFileChunks(fh.f.wfs.LookupFn(), nonManifestChunks) chunks, manifestErr := filer.MaybeManifestize(fh.f.wfs.saveDataAsChunk(fh.f.fullpath()), chunks) if manifestErr != nil { // not good, but should be ok glog.V(0).Infof("MaybeManifestize: %v", manifestErr) } entry.Chunks = append(chunks, manifestChunks...) fh.f.wfs.mapPbIdFromLocalToFiler(request.Entry) defer fh.f.wfs.mapPbIdFromFilerToLocal(request.Entry) if err := filer_pb.CreateEntry(client, request); err != nil { glog.Errorf("fh flush create %s: %v", fh.f.fullpath(), err) return fmt.Errorf("fh flush create %s: %v", fh.f.fullpath(), err) } fh.f.wfs.metaCache.InsertEntry(context.Background(), filer.FromPbEntry(request.Directory, request.Entry)) return nil }) if err == nil { fh.f.dirtyMetadata = false } if err != nil { glog.Errorf("%v fh %d flush: %v", fh.f.fullpath(), fh.handle, err) return fuse.EIO } return nil }