From: Xiao Yang <yangx.jy@cn.fujitsu.com>
Date: Mon, 27 Jan 2020 19:02:24 +0000
Subject: [PATCH] virtiofsd/passthrough_ll: Pass errno to fuse_reply_err()

lo_copy_file_range() passes -errno to fuse_reply_err() and then fuse_reply_err()
changes it to errno again, so that subsequent fuse_send_reply_iov_nofree() catches
the wrong errno.(i.e. reports "fuse: bad error value: ...").

Make fuse_send_reply_iov_nofree() accept the correct -errno by passing errno
directly in lo_copy_file_range().

Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
Reviewed-by: Eryu Guan <eguan@linux.alibaba.com>

dgilbert: Sent upstream and now Merged as aa1185e153f774f1df65
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
(cherry picked from commit a931b6861e59c78d861017e9c6a9c161ff49a163)
---
 tools/virtiofsd/passthrough_ll.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough_ll.c
index fc15d61510..e6f2399efc 100644
--- a/tools/virtiofsd/passthrough_ll.c
+++ b/tools/virtiofsd/passthrough_ll.c
@@ -2441,7 +2441,7 @@ static void lo_copy_file_range(fuse_req_t req, fuse_ino_t ino_in, off_t off_in,
 
     res = copy_file_range(in_fd, &off_in, out_fd, &off_out, len, flags);
     if (res < 0) {
-        fuse_reply_err(req, -errno);
+        fuse_reply_err(req, errno);
     } else {
         fuse_reply_write(req, res);
     }