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

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Date: Tue, 25 Jun 2024 18:51:19 +0800
From: Xi Ruoyao <xry111@...111.site>
To: Christian Brauner <brauner@...nel.org>, Mateusz Guzik <mjguzik@...il.com>
Cc: 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, 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?

-- 
Xi Ruoyao <xry111@...111.site>
School of Aerospace Science and Technology, Xidian University