[newlib-cygwin] cygwin: unlink: don't try "final trick" in try_to_bin on NFS

[Corinna Vinschen <corinna at sourceware dot org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=5b7921523da00d81aaa0af829fbd8c5fe36e1e56

commit 5b7921523da00d81aaa0af829fbd8c5fe36e1e56
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Wed Oct 18 16:22:14 2017 +0200

    cygwin: unlink: don't try "final trick" in try_to_bin on NFS
    
    Doesn't work.  Just another STATUS_SHARING_VIOLATION.
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 winsup/cygwin/syscalls.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/winsup/cygwin/syscalls.cc b/winsup/cygwin/syscalls.cc
index 8ccc768..8124df9 100644
--- a/winsup/cygwin/syscalls.cc
+++ b/winsup/cygwin/syscalls.cc
@@ -532,8 +532,8 @@ try_to_bin (path_conv &pc, HANDLE &fh, ACCESS_MASK access, ULONG flags)
   NtClose (fh);
   fh = NULL; /* So unlink_nt doesn't close the handle twice. */
   /* On success or when trying to unlink a directory we just return here.
-     The below code only works for files. */
-  if (NT_SUCCESS (status) || pc.isdir ())
+     The below code only works for files.  It also fails on NFS. */
+  if (NT_SUCCESS (status) || pc.isdir () || pc.fs_is_nfs ())
     goto out;
   /* The final trick.  We create a temporary file with delete-on-close
      semantic and rename that file to the file just moved to the bin.