linux-kernel - Re: [PATCH 01/13] vfs: add d_is

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Message-ID: <20140207173636.GA8801@fieldses.org>
Date:	Fri, 7 Feb 2014 12:36:36 -0500
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	viro@...IV.linux.org.uk, torvalds@...ux-foundation.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	hch@...radead.org, akpm@...ux-foundation.org, dhowells@...hat.com,
	zab@...hat.com, jack@...e.cz, luto@...capital.net, mszeredi@...e.cz
Subject: Re: [PATCH 01/13] vfs: add d_is_dir()

On Fri, Feb 07, 2014 at 05:48:59PM +0100, Miklos Szeredi wrote:
> From: Miklos Szeredi <mszeredi@...e.cz>
> 
> Add d_is_dir(dentry) helper which is analogous to S_ISDIR().

While trying to get up to speed I notice that these flags were
introduced by b18825a7c8e37a7cf6abb97a12a6ad71af160de7 "VFS: Put a small
type field into struct dentry::d_flags" whose changelog tells me "what"
but not "why".  So out of curiosity: was that some kind of optimization,
or was there some other reason for it?

--b.
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