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From: Miklos Szeredi <miklos@szeredi.hu>
To: "Junichi Uekawa (上川純一)" <uekawa@google.com>
Cc: Keiichi Watanabe <keiichiw@chromium.org>,
	LKML <linux-kernel@vger.kernel.org>,
	mhiramat@google.com, takayas@chromium.org, drosen@google.com,
	sarthakkukreti@google.com, Jonathan Corbet <corbet@lwn.net>,
	linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH 2/3] fuse: Add negative_dentry_timeout option
Date: Wed, 21 Jun 2023 06:07:30 +0200	[thread overview]
Message-ID: <CAJfpegtNjAELur_AtqiGdO6LJRDyT+WQ1UKtG-o=Em0rAhOKMg@mail.gmail.com> (raw)
In-Reply-To: <CADgJSGGDeu_dPduBuK7N324oJ9641VKv2+fAVAbDY=-itsFjEQ@mail.gmail.com>

On Wed, 21 Jun 2023 at 00:53, Junichi Uekawa (上川純一) <uekawa@google.com> wrote:
>
> Hi
>
>
>
> 2023年6月21日(水) 4:28 Miklos Szeredi <miklos@szeredi.hu>:
>>
>> On Tue, 20 Jun 2023 at 17:14, Keiichi Watanabe <keiichiw@chromium.org> wrote:
>> >
>> > Add `negative_dentry_timeout` mount option for FUSE to cache negative
>> > dentries for the specified duration.
>>
>> This is already possible, no kernel changes needed.  See e.g.
>> xmp_init() in libfuse/example/passthrough.c.
>>
>
> Thank you for the pointer!
>
> So reading libfuse/fuse.c, fuse_lib_lookup does a reply with e.ino=0 err=0 (instead of ENOENT) with e.entry_timeout=negative_timeout,
> for each lookup (and there's no global configuration but that's okay) ?

Yes.

Thanks,
Miklos

  parent reply	other threads:[~2023-06-21  4:07 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-06-20 15:13 [PATCH 0/3] Support negative dentry cache for FUSE and virtiofs Keiichi Watanabe
2023-06-20 15:13 ` [PATCH 1/3] docs: virtiofs: Fix descriptions about virtiofs mount option Keiichi Watanabe
2023-06-20 15:13 ` [PATCH 2/3] fuse: Add negative_dentry_timeout option Keiichi Watanabe
2023-06-20 19:28   ` Miklos Szeredi
     [not found]     ` <CADgJSGGDeu_dPduBuK7N324oJ9641VKv2+fAVAbDY=-itsFjEQ@mail.gmail.com>
2023-06-21  4:07       ` Miklos Szeredi [this message]
2023-06-21  9:40         ` Keiichi Watanabe
2023-06-20 15:13 ` [PATCH 3/3] virtiofs: " Keiichi Watanabe

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