package filesys import ( "context" "github.com/chrislusf/seaweedfs/weed/util" "os" "syscall" "time" "github.com/chrislusf/seaweedfs/weed/filer" "github.com/chrislusf/seaweedfs/weed/glog" "github.com/chrislusf/seaweedfs/weed/pb/filer_pb" "github.com/seaweedfs/fuse" "github.com/seaweedfs/fuse/fs" ) var _ = fs.NodeLinker(&Dir{}) var _ = fs.NodeSymlinker(&Dir{}) var _ = fs.NodeReadlinker(&File{}) const ( HARD_LINK_MARKER = '\x01' ) func (dir *Dir) Link(ctx context.Context, req *fuse.LinkRequest, old fs.Node) (fs.Node, error) { oldFile, ok := old.(*File) if !ok { glog.Errorf("old node is not a file: %+v", old) } glog.V(4).Infof("Link: %v/%v -> %v/%v", oldFile.dir.FullPath(), oldFile.Name, dir.FullPath(), req.NewName) oldEntry, err := oldFile.maybeLoadEntry(ctx) if err != nil { return nil, err } if oldEntry == nil { return nil, fuse.EIO } // update old file to hardlink mode if len(oldEntry.HardLinkId) == 0 { oldEntry.HardLinkId = append(util.RandomBytes(16), HARD_LINK_MARKER) oldEntry.HardLinkCounter = 1 } oldEntry.HardLinkCounter++ updateOldEntryRequest := &filer_pb.UpdateEntryRequest{ Directory: oldFile.dir.FullPath(), Entry: oldEntry, Signatures: []int32{dir.wfs.signature}, } // CreateLink 1.2 : update new file to hardlink mode request := &filer_pb.CreateEntryRequest{ Directory: dir.FullPath(), Entry: &filer_pb.Entry{ Name: req.NewName, IsDirectory: false, Attributes: oldEntry.Attributes, Chunks: oldEntry.Chunks, Extended: oldEntry.Extended, HardLinkId: oldEntry.HardLinkId, HardLinkCounter: oldEntry.HardLinkCounter, }, Signatures: []int32{dir.wfs.signature}, } // apply changes to the filer, and also apply to local metaCache err = dir.wfs.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error { dir.wfs.mapPbIdFromLocalToFiler(request.Entry) defer dir.wfs.mapPbIdFromFilerToLocal(request.Entry) if err := filer_pb.UpdateEntry(client, updateOldEntryRequest); err != nil { glog.V(0).Infof("Link %v/%v -> %s/%s: %v", oldFile.dir.FullPath(), oldFile.Name, dir.FullPath(), req.NewName, err) return fuse.EIO } dir.wfs.metaCache.UpdateEntry(context.Background(), filer.FromPbEntry(updateOldEntryRequest.Directory, updateOldEntryRequest.Entry)) if err := filer_pb.CreateEntry(client, request); err != nil { glog.V(0).Infof("Link %v/%v -> %s/%s: %v", oldFile.dir.FullPath(), oldFile.Name, dir.FullPath(), req.NewName, err) return fuse.EIO } dir.wfs.metaCache.InsertEntry(context.Background(), filer.FromPbEntry(request.Directory, request.Entry)) return nil }) if err != nil { return nil, fuse.EIO } // create new file node newNode := dir.newFile(req.NewName) newFile := newNode.(*File) return newFile, err } func (dir *Dir) Symlink(ctx context.Context, req *fuse.SymlinkRequest) (fs.Node, error) { glog.V(4).Infof("Symlink: %v/%v to %v", dir.FullPath(), req.NewName, req.Target) request := &filer_pb.CreateEntryRequest{ Directory: dir.FullPath(), Entry: &filer_pb.Entry{ Name: req.NewName, IsDirectory: false, Attributes: &filer_pb.FuseAttributes{ Mtime: time.Now().Unix(), Crtime: time.Now().Unix(), FileMode: uint32((os.FileMode(0777) | os.ModeSymlink) &^ dir.wfs.option.Umask), Uid: req.Uid, Gid: req.Gid, SymlinkTarget: req.Target, }, }, Signatures: []int32{dir.wfs.signature}, } err := dir.wfs.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error { dir.wfs.mapPbIdFromLocalToFiler(request.Entry) defer dir.wfs.mapPbIdFromFilerToLocal(request.Entry) if err := filer_pb.CreateEntry(client, request); err != nil { glog.V(0).Infof("symlink %s/%s: %v", dir.FullPath(), req.NewName, err) return fuse.EIO } dir.wfs.metaCache.InsertEntry(context.Background(), filer.FromPbEntry(request.Directory, request.Entry)) return nil }) symlink := dir.newFile(req.NewName) return symlink, err } func (file *File) Readlink(ctx context.Context, req *fuse.ReadlinkRequest) (string, error) { entry, err := file.maybeLoadEntry(ctx) if err != nil { return "", err } if os.FileMode(entry.Attributes.FileMode)&os.ModeSymlink == 0 { return "", fuse.Errno(syscall.EINVAL) } glog.V(4).Infof("Readlink: %v/%v => %v", file.dir.FullPath(), file.Name, entry.Attributes.SymlinkTarget) return entry.Attributes.SymlinkTarget, nil }