linux-kernel - Re: [PATCH v3] vfs: support statx(..., NULL, AT_EMPTY

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Date: Wed, 26 Jun 2024 15:05:23 +0200
From: Christian Brauner <brauner@...nel.org>
To: Mateusz Guzik <mjguzik@...il.com>
Cc: Christian Brauner <brauner@...nel.org>,
	viro@...iv.linux.org.uk,
	jack@...e.cz,
	linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	io-uring@...r.kernel.org,
	axboe@...nel.dk,
	torvalds@...ux-foundation.org,
	xry111@...111.site,
	loongarch@...ts.linux.dev
Subject: Re: [PATCH v3] vfs: support statx(..., NULL, AT_EMPTY_PATH, ...)

On Tue, 25 Jun 2024 17:18:06 +0200, Mateusz Guzik wrote:
> The newly used helper also checks for empty ("") paths.
> 
> NULL paths with any flag value other than AT_EMPTY_PATH go the usual
> route and end up with -EFAULT to retain compatibility (Rust is abusing
> calls of the sort to detect availability of statx).
> 
> This avoids path lookup code, lockref management, memory allocation and
> in case of NULL path userspace memory access (which can be quite
> expensive with SMAP on x86_64).
> 
> [...]

Applied to the vfs.misc branch of the vfs/vfs.git tree.
Patches in the vfs.misc branch should appear in linux-next soon.

Please report any outstanding bugs that were missed during review in a
new review to the original patch series allowing us to drop it.

It's encouraged to provide Acked-bys and Reviewed-bys even though the
patch has now been applied. If possible patch trailers will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. If in doubt, please check the listed branch.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: vfs.misc

[1/1] vfs: support statx(..., NULL, AT_EMPTY_PATH, ...)
      https://git.kernel.org/vfs/vfs/c/33b321ac3a51