linux-kernel - Re: [PATCH] fs: dodge an atomic in putname if ref == 1

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Message-ID: <20250312-zwang-farbbeutel-a4c031fd05df@brauner>
Date: Wed, 12 Mar 2025 09:36:00 +0100
From: Christian Brauner <brauner@...nel.org>
To: Mateusz Guzik <mjguzik@...il.com>
Cc: Christian Brauner <brauner@...nel.org>,
	jack@...e.cz,
	linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	io-uring@...r.kernel.org,
	audit@...r.kernel.org,
	axboe@...nel.dk,
	viro@...iv.linux.org.uk
Subject: Re: [PATCH] fs: dodge an atomic in putname if ref == 1

On Tue, 11 Mar 2025 19:18:04 +0100, Mateusz Guzik wrote:
> While the structure is refcounted, the only consumer incrementing it is
> audit and even then the atomic operation is only needed when it
> interacts with io_uring.
> 
> If putname spots a count of 1, there is no legitimate way for anyone to
> bump it.
> 
> [...]

Applied to the vfs-6.15.misc branch of the vfs/vfs.git tree.
Patches in the vfs-6.15.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-6.15.misc

[1/1] fs: dodge an atomic in putname if ref == 1
      https://git.kernel.org/vfs/vfs/c/c93617c0f22c