package filesys import ( "context" "fmt" "io" "math" "mime" "path" "time" "github.com/gabriel-vasile/mimetype" "github.com/chrislusf/seaweedfs/weed/filer2" "github.com/chrislusf/seaweedfs/weed/glog" "github.com/chrislusf/seaweedfs/weed/pb/filer_pb" "github.com/seaweedfs/fuse" "github.com/seaweedfs/fuse/fs" ) type FileHandle struct { // cache file has been written to dirtyPages *ContinuousDirtyPages contentType string dirtyMetadata bool handle uint64 f *File RequestId fuse.RequestID // unique ID for request 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 } func newFileHandle(file *File, uid, gid uint32) *FileHandle { return &FileHandle{ f: file, dirtyPages: newDirtyPages(file), Uid: uid, Gid: gid, } } 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 { glog.V(4).Infof("%s read fh %d: [%d,%d)", fh.f.fullpath(), fh.handle, req.Offset, req.Offset+int64(req.Size)) buff := make([]byte, req.Size) totalRead, err := fh.readFromChunks(buff, req.Offset) if err == nil { dirtyOffset, dirtySize := fh.readFromDirtyPages(buff, req.Offset) if totalRead+req.Offset < dirtyOffset+int64(dirtySize) { totalRead = dirtyOffset + int64(dirtySize) - req.Offset } } resp.Data = buff[:totalRead] if err != nil { glog.Errorf("file handle read %s: %v", fh.f.fullpath(), err) return fuse.EIO } return err } func (fh *FileHandle) readFromDirtyPages(buff []byte, startOffset int64) (offset int64, size int) { return fh.dirtyPages.ReadDirtyData(buff, startOffset) } func (fh *FileHandle) readFromChunks(buff []byte, offset int64) (int64, error) { // this value should come from the filer instead of the old f if len(fh.f.entry.Chunks) == 0 { glog.V(1).Infof("empty fh %v", fh.f.fullpath()) return 0, nil } if fh.f.entryViewCache == nil { fh.f.entryViewCache = filer2.NonOverlappingVisibleIntervals(fh.f.entry.Chunks) fh.f.reader = nil } if fh.f.reader == nil { chunkViews := filer2.ViewFromVisibleIntervals(fh.f.entryViewCache, 0, math.MaxInt64) fh.f.reader = filer2.NewChunkStreamReaderFromClient(fh.f.wfs, chunkViews) } fh.f.reader.Seek(offset, io.SeekStart) totalRead, err := fh.f.reader.Read(buff) if err != nil { glog.Errorf("file handle read %s: %v", fh.f.fullpath(), err) } // glog.V(0).Infof("file handle read %s [%d,%d] %d : %v", fh.f.fullpath(), 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 { // write the request to volume servers fh.f.entry.Attributes.FileSize = uint64(max(req.Offset+int64(len(req.Data)), int64(fh.f.entry.Attributes.FileSize))) // glog.V(0).Infof("%v write [%d,%d)", fh.f.fullpath(), req.Offset, req.Offset+int64(len(req.Data))) chunks, err := fh.dirtyPages.AddPage(req.Offset, req.Data) if err != nil { glog.Errorf("%v write fh %d: [%d,%d): %v", fh.f.fullpath(), fh.handle, req.Offset, req.Offset+int64(len(req.Data)), err) return fuse.EIO } resp.Size = len(req.Data) if req.Offset == 0 { // detect mime type detectedMIME := mimetype.Detect(req.Data) fh.contentType = detectedMIME.String() if ext := path.Ext(fh.f.Name); ext != detectedMIME.Extension() { fh.contentType = mime.TypeByExtension(ext) } fh.dirtyMetadata = true } if len(chunks) > 0 { fh.f.addChunks(chunks) fh.dirtyMetadata = true } return nil } func (fh *FileHandle) Release(ctx context.Context, req *fuse.ReleaseRequest) error { glog.V(4).Infof("%v release fh %d", fh.f.fullpath(), fh.handle) fh.f.isOpen-- if fh.f.isOpen <= 0 { fh.dirtyPages.releaseResource() fh.f.wfs.ReleaseHandle(fh.f.fullpath(), fuse.HandleID(fh.handle)) } return nil } func (fh *FileHandle) Flush(ctx context.Context, req *fuse.FlushRequest) error { // fflush works at fh level // send the data to the OS glog.V(4).Infof("%s fh %d flush %v", fh.f.fullpath(), fh.handle, req) chunks, err := fh.dirtyPages.FlushToStorage() if err != nil { glog.Errorf("flush %s: %v", fh.f.fullpath(), err) return fuse.EIO } fh.f.addChunks(chunks) if len(chunks) > 0 { fh.dirtyMetadata = true } if !fh.dirtyMetadata { return nil } err = fh.f.wfs.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error { if fh.f.entry.Attributes != nil { fh.f.entry.Attributes.Mime = fh.contentType fh.f.entry.Attributes.Uid = req.Uid fh.f.entry.Attributes.Gid = req.Gid fh.f.entry.Attributes.Mtime = time.Now().Unix() fh.f.entry.Attributes.Crtime = time.Now().Unix() fh.f.entry.Attributes.FileMode = uint32(0777 &^ fh.f.wfs.option.Umask) fh.f.entry.Attributes.Collection = fh.dirtyPages.collection fh.f.entry.Attributes.Replication = fh.dirtyPages.replication } request := &filer_pb.CreateEntryRequest{ Directory: fh.f.dir.Path, Entry: fh.f.entry, } glog.V(3).Infof("%s set chunks: %v", fh.f.fullpath(), len(fh.f.entry.Chunks)) for i, chunk := range fh.f.entry.Chunks { glog.V(3).Infof("%s chunks %d: %v [%d,%d)", fh.f.fullpath(), i, chunk.FileId, chunk.Offset, chunk.Offset+int64(chunk.Size)) } chunks, garbages := filer2.CompactFileChunks(fh.f.entry.Chunks) fh.f.entry.Chunks = chunks // fh.f.entryViewCache = nil 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.deleteFileChunks(garbages) for i, chunk := range garbages { glog.V(3).Infof("garbage %s chunks %d: %v [%d,%d)", fh.f.fullpath(), i, chunk.FileId, chunk.Offset, chunk.Offset+int64(chunk.Size)) } return nil }) if err == nil { fh.dirtyMetadata = false } if err != nil { glog.Errorf("%v fh %d flush: %v", fh.f.fullpath(), fh.handle, err) return fuse.EIO } return nil }