linux-kernel - Re: [PATCH] fs: rework I_NEW handling to operate without fences

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Message-ID: <20251021-staudamm-letztendlich-2100c3b719ec@brauner>
Date: Tue, 21 Oct 2025 14:49:00 +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: rework I_NEW handling to operate without fences

On Sat, 11 Oct 2025 00:17:36 +0200, Mateusz Guzik wrote:
> In the inode hash code grab the state while ->i_lock is held. If found
> to be set, synchronize the sleep once more with the lock held.
> 
> In the real world the flag is not set most of the time.
> 
> Apart from being simpler to reason about, it comes with a minor speed up
> as now clearing the flag does not require the smp_mb() fence.
> 
> [...]

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: rework I_NEW handling to operate without fences
      https://git.kernel.org/vfs/vfs/c/f5608fff035a