linux-kernel - Re: [PATCH] fs: add missing fences to I

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Message-ID: <20251006-hauer-salzig-7f287781757a@brauner>
Date: Mon,  6 Oct 2025 13:37:51 +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
Subject: Re: [PATCH] fs: add missing fences to I_NEW handling

On Mon, 06 Oct 2025 01:15:26 +0200, Mateusz Guzik wrote:
> Suppose there are 2 CPUs racing inode hash lookup func (say ilookup5())
> and unlock_new_inode().
> 
> In principle the latter can clear the I_NEW flag before prior stores
> into the inode were made visible.
> 
> The former can in turn observe I_NEW is cleared and proceed to use the
> inode, while possibly reading from not-yet-published areas.
> 
> [...]

Applied to the vfs-6.19.inode branch of the vfs/vfs.git tree.
Patches in the vfs-6.19.inode 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-6.19.inode

[1/1] fs: add missing fences to I_NEW handling
      https://git.kernel.org/vfs/vfs/c/fb43e3dde8ec