SMB3: Fix mkdir when idsfromsid configured on mount

mkdir uses a compounded create operation which was not setting
the security descriptor on create of a directory. Fix so
mkdir now sets the mode and owner info properly when idsfromsid
and modefromsid are configured on the mount.

Signed-off-by: Steve French <stfrench@microsoft.com>
CC: Stable <stable@vger.kernel.org> # v5.8
Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>

Author: smfrench

fs/cifs/smb2inode.c

@@ -115,6 +115,7 @@ smb2_compound_op(const unsigned int xid, struct cifs_tcon *tcon,
 	vars->oparms.fid = &fid;
 	vars->oparms.reconnect = false;
 	vars->oparms.mode = mode;
+	vars->oparms.cifs_sb = cifs_sb;
 
 	rqst[num_rqst].rq_iov = &vars->open_iov[0];
 	rqst[num_rqst].rq_nvec = SMB2_CREATE_IOV_SIZE;