linux-kernel - Re: [PATCH 2/2] vfs: support statx(..., NULL, AT_EMPTY

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Message-ID: <CAHk-=wi0ejJ=PCZfCmMKvsFmzvVzAYYt1K9vtwke4=arfHiAdg@mail.gmail.com>
Date: Wed, 3 Jul 2024 09:31:35 -0700
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Christian Brauner <brauner@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>, Huacai Chen <chenhuacai@...nel.org>, Xi Ruoyao <xry111@...111.site>, 
	Mateusz Guzik <mjguzik@...il.com>, Alexander Viro <viro@...iv.linux.org.uk>, Jan Kara <jack@...e.cz>, 
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org, 
	io-uring@...r.kernel.org, Jens Axboe <axboe@...nel.dk>, loongarch@...ts.linux.dev
Subject: Re: [PATCH 2/2] vfs: support statx(..., NULL, AT_EMPTY_PATH, ...)

On Wed, 3 Jul 2024 at 01:46, Christian Brauner <brauner@...nel.org> wrote:
>
> We've now added AT_EMPTY_PATH support with NULL names because we want to
> allow that generically. But I clearly remember that this was requested
> to make statx() work with these sandboxes. So the kernel has done its
> part. Now it's for the sandbox to allow statx() with NULL paths and
> AT_EMPTY_PATH but certainly not for the kernel to start reenabling old
> system calls.

Those old system calls are still used.

Just enable them.

statx isn't the promised land. Existing applications matter. And there
is absolutely nothing wrong with plain old 'stat' (well, we call it
"newstat" in the kernel for historical reasons) on 64-bit
architectures.

Honestly, 'statx' is disgusting. I don't understand why anybody pushes
that thing that nobody actually uses or cares about.

                Linus