From e108eee92cc057ecd4d7d46255635862a74213ba Mon Sep 17 00:00:00 2001
From: Giuseppe Scrivano <gscrivan@redhat.com>
Date: Mon, 8 Apr 2019 22:12:04 +0200
Subject: [PATCH] fuse-overlayfs: write uses SPLICE_MOVE|SPLICE_NONBLOCK

don't block on writing to the pipe.  It has a significant impact on
the performance.

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
---
 main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/main.c b/main.c
index d22c617..e021061 100644
--- a/main.c
+++ b/main.c
@@ -2603,7 +2603,7 @@ ovl_write_buf (fuse_req_t req, fuse_ino_t ino,
 	     ino, out_buf.buf[0].size, (unsigned long) off, (int) fi->fh);
 
   errno = 0;
-  res = fuse_buf_copy (&out_buf, in_buf, 0);
+  res = fuse_buf_copy (&out_buf, in_buf, FUSE_BUF_SPLICE_MOVE | FUSE_BUF_SPLICE_NONBLOCK);
   if (res < 0)
     fuse_reply_err (req, errno);
   else