fs: extract kWriteFileMaxChunkSize constant

PR-URL: #32640 Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: David Carlier <[email protected]>

Author: rickyes

lib/internal/fs/promises.js

@@ -4,6 +4,11 @@
 // See https://github.com/libuv/libuv/pull/1501.
 constkIoMaxLength=2**31-1;
 
+// Note: This is different from kReadFileBufferLength used for non-promisified
+// fs.readFile.
+constkReadFileMaxChunkSize=2**14;
+constkWriteFileMaxChunkSize=2**14;
+
 const{
  MathMax,
  MathMin,
@@ -150,16 +155,12 @@ async function writeFileHandle(filehandle, data){
 do{
 const{ bytesWritten }=
 awaitwrite(filehandle,data,0,
-MathMin(16384,data.length));
+MathMin(kWriteFileMaxChunkSize,data.length));
 remaining-=bytesWritten;
 data=data.slice(bytesWritten);
 }while(remaining>0);
 }
 
-// Note: This is different from kReadFileBufferLength used for non-promisified
-// fs.readFile.
-constkReadFileMaxChunkSize=16384;
-
 asyncfunctionreadFileHandle(filehandle,options){
 conststatFields=awaitbinding.fstat(filehandle.fd,false,kUsePromises);