smb3: Do not send SMB3 SET_INFO if nothing changed
commit fd09b7d3b352105f08b8e02f7afecf7e816380ef upstream.
An earlier commit had a typo which prevented the
optimization from working:
commit 18dd8e1a65dd ("Do not send SMB3 SET_INFO request if nothing is changing")
Thank you to Metze for noticing this. Also clear a
reserved field in the FILE_BASIC_INFO struct we send
that should be zero (all the other fields in that
struct were set or cleared explicitly already in
cifs_set_file_info).
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
CC: Stable <stable@vger.kernel.org> # 4.9.x+
Reported-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 24c19eb..a012f70 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1116,6 +1116,8 @@
if (!server->ops->set_file_info)
return -ENOSYS;
+ info_buf.Pad = 0;
+
if (attrs->ia_valid & ATTR_ATIME) {
set_time = true;
info_buf.LastAccessTime =