cifs: do not attempt cifs operation on smb2+ rename error

A path-based rename returning EBUSY will incorrectly try opening
the file with a cifs (NT Create AndX) operation on an smb2+ mount,
which causes the server to force a session close.

If the mount is smb2+, skip the fallback.

Signed-off-by: Frank Sorenson <sorenson@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
CC: Stable <stable@vger.kernel.org>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>

diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 53fdb5d..538fd7d 100644 (file)
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1735,6 +1735,10 @@ cifs_do_rename(const unsigned int xid, struct dentry *from_dentry,
        if (rc == 0 || rc != -EBUSY)
                goto do_rename_exit;
 
+       /* Don't fall back to using SMB on SMB 2+ mount */
+       if (server->vals->protocol_id != 0)
+               goto do_rename_exit;
+
        /* open-file renames don't work across directories */
        if (to_dentry->d_parent != from_dentry->d_parent)
                goto do_rename_exit;