stream: _write takes an encoding argument

This vastly reduces the overhead of decodeStrings:false streams,
such as net and http.

1 files changed, 4 insertions, 2 deletions

diff --git a/lib/fs.js b/lib/fs.js
index d467c5e0c..39a34abc9 100644
--- a/lib/fs.js
+++ b/lib/fs.js
@@ -1650,12 +1650,14 @@ WriteStream.prototype.open = function() {
 };
 
 
-WriteStream.prototype._write = function(data, cb) {
+WriteStream.prototype._write = function(data, encoding, cb) {
   if (!Buffer.isBuffer(data))
     return this.emit('error', new Error('Invalid data'));
 
   if (typeof this.fd !== 'number')
-    return this.once('open', this._write.bind(this, data, cb));
+    return this.once('open', function() {
+      this._write(data, encoding, cb);
+    });
 
   var self = this;
   fs.write(this.fd, data, 0, data.length, this.pos, function(er, bytes) {