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Date: Thu, 10 Dec 2015 02:40:50 +0000
From: Al Viro <viro@ZenIV.linux.org.uk>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-fsdevel <linux-fsdevel@vger.kernel.org>,
        Neil Brown <neilb@suse.com>
Subject: Re: [PATCHSET v2] ->follow_link() without dropping from RCU mode
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On Thu, Dec 10, 2015 at 12:10:12AM +0000, Al Viro wrote:

> PS: I toyed with the idea of replacing cookie a struct callback_head, to make

... except that it would have to be something like work_struct, since
callback_head gets embedded into the argument and here we don't want to
do that.  _And_ we've no use for ->entry in work_struct, which makes it
a bad fit as well.  IOW, please ignore that idiocy...