linux-kernel - Re: [PATCH] fs/9p: don't use cached metadata in revalidate for cache=mmap

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Message-ID: <CAHzjS_s5EzJkvTqi73XS_9bBsaGuXu1zQ4jOLgcpC9vmJ7FoaA@mail.gmail.com>
Date: Tue, 21 Oct 2025 15:46:00 -0700
From: Song Liu <song@...nel.org>
To: asmadeus@...ewreck.org
Cc: Song Liu <song@...nel.org>, Andrii Nakryiko <andrii.nakryiko@...il.com>, 
	Eric Van Hensbergen <ericvh@...nel.org>, Latchesar Ionkov <lucho@...kov.net>, 
	Christian Schoenebeck <linux_oss@...debyte.com>, Tingmao Wang <m@...wtm.org>, 
	Alexei Starovoitov <ast@...nel.org>, linux-kernel@...r.kernel.org, v9fs@...ts.linux.dev, 
	bpf@...r.kernel.org
Subject: Re: [PATCH] fs/9p: don't use cached metadata in revalidate for cache=mmap

On Tue, Oct 21, 2025 at 3:10 PM Dominique Martinet via B4 Relay
<devnull+asmadeus.codewreck.org@...nel.org> wrote:
>
> From: Dominique Martinet <asmadeus@...ewreck.org>
[...]
> ---
>
> Reported-by: Song Liu <song@...nel.org>
> Link: https://lkml.kernel.org/r/CAHzjS_u_SYdt5=2gYO_dxzMKXzGMt-TfdE_ueowg-Hq5tRCAiw@mail.gmail.com
> Reported-by: Andrii Nakryiko <andrii.nakryiko@...il.com>
> Link: https://lore.kernel.org/bpf/CAEf4BzZbCE4tLoDZyUf_aASpgAGFj75QMfSXX4a4dLYixnOiLg@mail.gmail.com/
> Fixes: 290434474c33 ("fs/9p: Refresh metadata in d_revalidate for uncached mode too")
> Signed-off-by: Dominique Martinet <asmadeus@...ewreck.org>

I can confirm this fixes bpftrace and the reproducer in the VM.

Tested-by: Song Liu <song@...nel.org>

Thanks for the quick fix!

[...]