Re: [PATCH 01/13] vfs: add d_is_dir()

[J. Bruce Fields]

On Fri, Feb 07, 2014 at 05:48:59PM +0100, Miklos Szeredi wrote:
> From: Miklos Szeredi <mszeredi@xxxxxxx>
> 
> 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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