From 663588e68e66b0fd3d588db9ad3dc5e3cf3ee577 Mon Sep 17 00:00:00 2001
From: Momtchil Momtchev <momtchil@momtchev.com>
Date: Mon, 14 Dec 2020 17:03:31 +0100
Subject: [PATCH] unix: check for partial copy_file_range support

Fixes: https://github.com/libuv/libuv/issues/3069
PR-URL: https://github.com/libuv/libuv/pull/3070
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
---
 src/unix/fs.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/unix/fs.c b/src/unix/fs.c
index 0d36103b..88ac0731 100644
--- a/src/unix/fs.c
+++ b/src/unix/fs.c
@@ -923,8 +923,12 @@ static ssize_t uv__fs_sendfile(uv_fs_t* req) {
         r = uv__fs_copy_file_range(in_fd, &off, out_fd, NULL, req->bufsml[0].len, 0);
 
         if (r == -1 && errno == ENOSYS) {
+          /* ENOSYS - it will never work */
           errno = 0;
           copy_file_range_support = 0;
+        } else if (r == -1 && errno == ENOTSUP) {
+          /* ENOTSUP - it could work on another file system type */
+          errno = 0;
         } else {
           goto ok;
         }