linux-kernel - Re: [PATCH 01/10] vfs: add d

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Message-ID: <20130904181219.GJ13318@ZenIV.linux.org.uk>
Date:	Wed, 4 Sep 2013 19:12:19 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	rwheeler@...hat.com, avati@...hat.com, bfoster@...hat.com,
	dhowells@...hat.com, eparis@...hat.com, raven@...maw.net,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	mszeredi@...e.cz
Subject: Re: [PATCH 01/10] vfs: add d_walk()

On Wed, Sep 04, 2013 at 04:05:47PM +0200, Miklos Szeredi wrote:
> From: Miklos Szeredi <mszeredi@...e.cz>
> 
> This one replaces three instances open coded tree walking (have_submounts,
> select_parent, d_genocide) with a common helper.
> 
> In addition to slightly reducing the kernel size, this simplifies the
> callers and makes them less bug prone.

Two notes:

1) I'd probably kill select_parent() - it made sense when it was a huge
function called in a loop, but when it's a simple call of d_walk()...
Might as well do it directly in shrink_dcache_parent().  Moreover, in
that case we'd be free to embed list_head into your struct select_data,
rather than passing pointers.

2) I'm not sure we need the "leave" callback at all; the only user is
d_genocide() and AFAICS it can bloody well be done as part of
d_genocide_check() - we care about having it done to all nodes in
the tree, but we don't really care about the order in which it's
done...
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