linux-kernel - Re: [PATCH v2] vfs: Shortcut AT_EMPTY_PATH early for statx, and add AT_NO

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Message-ID: <CAGudoHFQ1SnKubuDsSxE39W+MR6Af2PbHkrNwAAbZFb-9ETswQ@mail.gmail.com>
Date: Mon, 24 Jun 2024 14:28:03 +0200
From: Mateusz Guzik <mjguzik@...il.com>
To: Xi Ruoyao <xry111@...111.site>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>, Christian Brauner <brauner@...nel.org>, 
	Alexander Viro <viro@...iv.linux.org.uk>, Jan Kara <jack@...e.cz>, 
	Alejandro Colomar <alx@...nel.org>, Arnd Bergmann <arnd@...db.de>, Huacai Chen <chenhuacai@...ngson.cn>, 
	Xuerui Wang <kernel@...0n.name>, Jiaxun Yang <jiaxun.yang@...goat.com>, 
	Icenowy Zheng <uwu@...nowy.me>, linux-fsdevel@...r.kernel.org, linux-arch@...r.kernel.org, 
	loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] vfs: Shortcut AT_EMPTY_PATH early for statx, and add
 AT_NO_PATH for statx and fstatat

On Mon, Jun 24, 2024 at 2:19 PM Xi Ruoyao <xry111@...111.site> wrote:
>
> On Mon, 2024-06-24 at 11:04 +0200, Mateusz Guzik wrote:
> > Below is a diff which compiles but is untested. It adds AT_EMPTY_PATH +
> > NULL as suggsted by Linus, but it can be adjusted for AT_NO_PATH (which
> > would be my preffered option, or better yet not do that and add fstatx).
> >
> > It does not do the hack to 0-check if a pointer was passed along with
> > AT_EMPTY_PATH but that again is an easy addition.
> >
> > Feel free to take without attribution:
>
> I'd still like to make it Co-developed-by: or just From: you.  Could you
> give a S-o-b?
>

I just trivially shuffled some things around and did not even test, so
I'm not signing off on squat here. :)

However, if you insist you can add something like "Written after
picking up an initial patch written by Mateusz Guzik, see [link goes
here]" or similar.

> And with this change AT_FDCWD with AT_EMPTY_PATH and NULL path does not
> work.  For consistency it'd be better to make it work too:
>

Good catch, I have no opinion which way to fix it.

-- 
Mateusz Guzik <mjguzik gmail.com>