filer: option to create file only if it is new, O_EXCL

weed/server/filer_grpc_server.go

@@ -139,7 +139,7 @@ func (fs *FilerServer) CreateEntry(ctx context.Context, req *filer_pb.CreateEntr
 		FullPath: fullpath,
 		Attr:     filer2.PbToEntryAttribute(req.Entry.Attributes),
 		Chunks:   chunks,
-	})
+	}, req.OExcl)
 
 	if err == nil {
 		fs.filer.DeleteChunks(garbages)

weed/server/filer_grpc_server_rename.go

@@ -107,7 +107,7 @@ func (fs *FilerServer) moveSelfEntry(ctx context.Context, oldParent filer2.FullP
 		Attr:     entry.Attr,
 		Chunks:   entry.Chunks,
 	}
-	createErr := fs.filer.CreateEntry(ctx, newEntry)
+	createErr := fs.filer.CreateEntry(ctx, newEntry, false)
 	if createErr != nil {
 		return createErr
 	}

weed/server/filer_server_handlers_write.go

@@ -193,7 +193,7 @@ func (fs *FilerServer) updateFilerStore(ctx context.Context, r *http.Request, w
 		entry.Attr.Mime = mime.TypeByExtension(ext)
 	}
 	// glog.V(4).Infof("saving %s => %+v", path, entry)
-	if dbErr := fs.filer.CreateEntry(ctx, entry); dbErr != nil {
+	if dbErr := fs.filer.CreateEntry(ctx, entry, false); dbErr != nil {
 		fs.filer.DeleteChunks(entry.Chunks)
 		glog.V(0).Infof("failing to write %s to filer server : %v", path, dbErr)
 		writeJsonError(w, r, http.StatusInternalServerError, dbErr)

weed/server/filer_server_handlers_write_autochunk.go

@@ -176,7 +176,7 @@ func (fs *FilerServer) doAutoChunk(ctx context.Context, w http.ResponseWriter, r
 		},
 		Chunks: fileChunks,
 	}
-	if dbErr := fs.filer.CreateEntry(ctx, entry); dbErr != nil {
+	if dbErr := fs.filer.CreateEntry(ctx, entry, false); dbErr != nil {
 		fs.filer.DeleteChunks(entry.Chunks)
 		replyerr = dbErr
 		filerResult.Error = dbErr.Error()