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

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Message-ID: <CAGudoHEDKvP926Q6tX1Te_WW9_OTLUoDRTO3nCO3LHo6HJyLpQ@mail.gmail.com>
Date: Tue, 25 Jun 2024 12:52:39 +0200
From: Mateusz Guzik <mjguzik@...il.com>
To: Xi Ruoyao <xry111@...111.site>
Cc: Christian Brauner <brauner@...nel.org>, Alexander Viro <viro@...iv.linux.org.uk>, Jan Kara <jack@...e.cz>, 
	Linus Torvalds <torvalds@...ux-foundation.org>, 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 Tue, Jun 25, 2024 at 12:51 PM Xi Ruoyao <xry111@...111.site> wrote:
>
> On Tue, 2024-06-25 at 10:50 +0200, Christian Brauner wrote:
> > No, let's not waste AT_* flag space in fear of some hypothetical
> > breakage. Let's try it cleanly first and make AT_EMPTY_PATH work with
> > NULL paths.
> >
> > Note, I started working on this (checks ...) 30th April but then some
> > other work came up and I never got back to it (Sorry, Linus). I pushed
> > the branch to #vfs.empty.path now. The top three commits was what I had
> > started doing.
> >
> > It was based on a new vfs_empty_path() helper so we could reuse it for
> > other system calls as well.
>
> If I understand correctly, I should submit a patch against
> vfs.empty.path making statx(fd, NULL, AT_EMPTY_PATH) work then?
>

I just sorted this out, will be sending a patchset shortly.


-- 
Mateusz Guzik <mjguzik gmail.com>