src: use offset calc. instead of `req->data` in node_file

A small refactor – this removes one layer of pointer indirection.
(The performance gain is likely negligible, the main point here
being that this encapsulates libuv request management a bit more.)

PR-URL: https://github.com/nodejs/node/pull/21839
Reviewed-By: Eugene Ostroukhov <eostroukhov@google.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Jon Moss <me@jonathanmoss.me>

1 files changed, 8 insertions, 0 deletions

diff --git a/src/node_file.h b/src/node_file.h
index 6b45dc88175..141d1d42d74 100644
--- a/src/node_file.h
+++ b/src/node_file.h
@@ -68,6 +68,10 @@ class FSReqBase : public ReqWrap<uv_fs_t> {
 
   bool use_bigint() const { return use_bigint_; }
 
+  static FSReqBase* from_req(uv_fs_t* req) {
+    return static_cast<FSReqBase*>(ReqWrap::from_req(req));
+  }
+
  private:
   enum encoding encoding_ = UTF8;
   bool has_data_ = false;
@@ -284,6 +288,10 @@ class FileHandle : public AsyncWrap, public StreamBase {
 
     void Reject(Local<Value> reason);
 
+    static CloseReq* from_req(uv_fs_t* req) {
+      return static_cast<CloseReq*>(ReqWrap::from_req(req));
+    }
+
    private:
     Persistent<Promise> promise_;
     Persistent<Value> ref_;