David Disseldorp [off-list ref] writes:

On Mon,  3 May 2021 11:55:26 -0300, Paulo Alcantara wrote:

quoted

-	rc = cifs_setup_volume_info(cifs_sb->ctx, NULL, old_ctx->UNC);
+	rc = cifs_setup_volume_info(cifs_sb->ctx, NULL, NULL);

IIUC, with the new behaviour, this call becomes pretty much an
	if (!cifs_sb->ctx->username)
		root = ERR_PTR(-EINVAL);

Yeah.  We should get rid of the damn thing at some point.  I've just
tried to keep the logic we currently have in fs/cifs/connect.c by
composing new options based upon the chased DFS referrals.

Thanks for pointing it out!