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Date:   Fri, 1 Jun 2018 00:11:52 +0100
From:   Al Viro <viro@ZenIV.linux.org.uk>
To:     David Howells <dhowells@redhat.com>
Cc:     linux-fsdevel@vger.kernel.org, linux-afs@lists.infradead.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 03/32] VFS: Introduce the basic header for the new mount
 API's filesystem context [ver #8]
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On Fri, May 25, 2018 at 01:05:43AM +0100, David Howells wrote:
> +	bool			drop_sb:1;	/* T if need to drop an SB reference */

IMO that should be simply fc->root != NULL - if you keep a dentry, you'd better
make sure that its superblock has an active reference, so deactivate_super()
is needed anyway.