fs:improve error performance for readSync

benchmark/fs/bench-readSync.js

@@ -0,0 +1,57 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const tmpdir = require('../../test/common/tmpdir');
+tmpdir.refresh();
+
+const tmpfile = tmpdir.resolve(`.existing-file-${process.pid}`);
+fs.writeFileSync(tmpfile, 'this-is-for-a-benchmark', 'utf8');
+
+const bench = common.createBenchmark(main, {
+  type: ['existing', 'non-existing'],
+  paramType: ['offset-and-length', 'no-offset-and-length'],
+  n: [1e4],
+});
+
+function main({ n, type, paramType }) {
+  let fd;
+
+  switch (type) {
+    case 'existing':
+      fd = fs.openSync(tmpfile, 'r', 0o666);
+      break;
+    case 'non-existing':
+      fd = 1 << 30;
+      break;
+    default:
+      new Error('Invalid type');
+  }
+
+  bench.start();
+  switch (paramType) {
+    case 'offset-and-length':
+      for (let i = 0; i < n; i++) {
+        try {
+          fs.readSync(fd, Buffer.alloc(1), 0, 1, 0);
+        } catch {
+          // Continue regardless of error.
+        }
+      }
+      break;
+    case 'no-offset-and-length':
+      for (let i = 0; i < n; i++) {
+        try {
+          fs.readSync(fd, Buffer.alloc(1));
+        } catch {
+          // Continue regardless of error.
+        }
+      }
+      break;
+    default:
+      new Error('Invalid type');
+  }
+  bench.end(n);
+
+  if (fd === 'existing') fs.closeSync(fd);
+}

lib/fs.js

@@ -751,11 +751,7 @@ function readSync(fd, buffer, offsetOrOptions, length, position) {
     validatePosition(position, 'position', length);
   }
 
-  const ctx = {};
-  const result = binding.read(fd, buffer, offset, length, position,
-                              undefined, ctx);
-  handleErrorFromBinding(ctx);
-  return result;
+  return binding.read(fd, buffer, offset, length, position);
 }
 
 /**

src/node_file.cc

@@ -2364,17 +2364,18 @@ static void Read(const FunctionCallbackInfo<Value>& args) {
   char* buf = buffer_data + off;
   uv_buf_t uvbuf = uv_buf_init(buf, len);
 
-  FSReqBase* req_wrap_async = GetReqWrap(args, 5);
-  if (req_wrap_async != nullptr) {  // read(fd, buffer, offset, len, pos, req)
+  if (argc > 5) {  // read(fd, buffer, offset, len, pos, req)
+    FSReqBase* req_wrap_async = GetReqWrap(args, 5);
+    CHECK_NOT_NULL(req_wrap_async);
     FS_ASYNC_TRACE_BEGIN0(UV_FS_READ, req_wrap_async)
     AsyncCall(env, req_wrap_async, args, "read", UTF8, AfterInteger,
               uv_fs_read, fd, &uvbuf, 1, pos);
-  } else {  // read(fd, buffer, offset, len, pos, undefined, ctx)
-    CHECK_EQ(argc, 7);
-    FSReqWrapSync req_wrap_sync;
+  } else {  // read(fd, buffer, offset, len, pos)
+    FSReqWrapSync req_wrap_sync("read");
     FS_SYNC_TRACE_BEGIN(read);
-    const int bytesRead = SyncCall(env, args[6], &req_wrap_sync, "read",
-                                   uv_fs_read, fd, &uvbuf, 1, pos);
+    const int bytesRead = SyncCallAndThrowOnError(env, &req_wrap_sync,
+                                                  uv_fs_read, fd, &uvbuf, 1,
+                                                  pos);
     FS_SYNC_TRACE_END(read, "bytesRead", bytesRead);
     args.GetReturnValue().Set(bytesRead);
   }

typings/internalBinding/fs.d.ts

@@ -157,6 +157,7 @@ declare namespace InternalFSBinding {
   function read(fd: number, buffer: ArrayBufferView, offset: number, length: number, position: number, req: FSReqCallback<number>): void;
   function read(fd: number, buffer: ArrayBufferView, offset: number, length: number, position: number, req: undefined, ctx: FSSyncContext): number;
   function read(fd: number, buffer: ArrayBufferView, offset: number, length: number, position: number, usePromises: typeof kUsePromises): Promise<number>;
+  function read(fd: number, buffer: ArrayBufferView, offset: number, length: number, position: number): number;
 
   function readBuffers(fd: number, buffers: ArrayBufferView[], position: number, req: FSReqCallback<number>): void;
   function readBuffers(fd: number, buffers: ArrayBufferView[], position: number, req: undefined, ctx: FSSyncContext): number;