linux-kernel - Re: [RFC] ->get_link(), ->put

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Message-ID: <CA+55aFx4H1uuDU9JST26FOwi6LBU9nJUPYvX7479DEk1tVaZ3w@mail.gmail.com>
Date:	Sun, 3 Jan 2016 11:53:21 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [RFC] ->get_link(), ->put_link() and cookies

On Thu, Dec 31, 2015 at 10:36 PM, Al Viro <viro@...iv.linux.org.uk> wrote:
>         In cases when we need to pin the symlink body in some manner, we
> need to undo whatever we'd done once the caller is done with the body.
> That went through several variants, the latest (in -next right now) being
> "have non-NULL ->put_link() and leave an argument for it in void *cookie,
> address of which is passed to ->get_link()".

The series looks ok to me, even if I still am not a fan of the cookie.
I suspect the remaining users could easily embed the returned string
at the end of a structure, and get their data with container_of(). It
would complicate their unusual behavior for sure, but make the common
case much more understandable.

Oh well. I won't insist - it may be too painful to be worth it. And
it's a fairly separate issue anyway.

So no objections to this series.

              Linus
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