linux-kernel - Re: [PATCH v2] vfs: Don't exchange "short" filenames unconditionally.

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Message-ID: <CA+55aFx1B_ULXd5iP8UikWrviqP7fxwsDT6jwqqNHLcrOh7YUw@mail.gmail.com>
Date:	Mon, 29 Sep 2014 13:45:03 -0700
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>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Mikhail Efremov <sem@...linux.org>
Subject: Re: [PATCH v2] vfs: Don't exchange "short" filenames unconditionally.

On Mon, Sep 29, 2014 at 12:04 PM, Al Viro <viro@...iv.linux.org.uk> wrote:
>>
>> "dname_external()".
>
> That we do...  Why is it in dcache.h, BTW?  No users outside of fs/dcache.c
> and I can't imagine a valid use for it in a module, let alone out-of-tree
> one...

Yeah, no, remove the declaration in dcache.h, and make it static to
fs/dcache.c. I don't think there's any possible valid use outside of
dcache.

> ObAnnoyance: gcc not figuring out that this container_of() isn't going to be
> NULL...  Sure, somebody might put (char *)16 into dentry->d_name.name, but...
> As it is, it makes for messier code generation; I can work around that, of
> course, but it's uglier than it ought to be ;-/

You could possibly play games with __attribute__((nonnull)) or
whatever it's called. Although I think you can only annotate arguments
that way (and you do it not by annotating the argument, but by making
it a function attribute, which I think is horrible, but whatever).

              Linus
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