linux-kernel - Re: [RFC PATCH v4 00/36] Fuse-BPF and plans on merging with Fuse Passthrough

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Message-ID: <bdf73614-0f74-4cb1-be2f-a2786e1f1850@ddn.com>
Date: Mon, 1 Apr 2024 20:27:55 +0000
From: Bernd Schubert <bschubert@....com>
To: Amir Goldstein <amir73il@...il.com>, Daniel Rosenberg <drosen@...gle.com>
CC: Miklos Szeredi <miklos@...redi.hu>, "bpf@...r.kernel.org"
	<bpf@...r.kernel.org>, Alexei Starovoitov <ast@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"linux-unionfs@...r.kernel.org" <linux-unionfs@...r.kernel.org>, Daniel
 Borkmann <daniel@...earbox.net>, John Fastabend <john.fastabend@...il.com>,
	Andrii Nakryiko <andrii@...nel.org>, Martin KaFai Lau <martin.lau@...ux.dev>,
	Song Liu <song@...nel.org>, Eduard Zingerman <eddyz87@...il.com>, Yonghong
 Song <yonghong.song@...ux.dev>, KP Singh <kpsingh@...nel.org>, Stanislav
 Fomichev <sdf@...gle.com>, Hao Luo <haoluo@...gle.com>, Jiri Olsa
	<jolsa@...nel.org>, Shuah Khan <shuah@...nel.org>, Jonathan Corbet
	<corbet@....net>, Joanne Koong <joannelkoong@...il.com>, Mykola Lysenko
	<mykolal@...com>, Christian Brauner <brauner@...nel.org>,
	"kernel-team@...roid.com" <kernel-team@...roid.com>
Subject: Re: [RFC PATCH v4 00/36] Fuse-BPF and plans on merging with Fuse
 Passthrough

On 4/1/24 16:43, Amir Goldstein wrote:
> 
>>
>> Can you not read/write without interacting with the server? Or do you
>> mean FOPEN_DIRECT_IO sends some file ops to the server even in
>> passthrough mode?
> 
> FOPEN_DIRECT_IO sends write() and read() to the server even in
> passthrough mode.
> 
>> At the moment I'm tempted to follow the same
>> mechanics passthrough is using. The only exception would be possibly
>> tossing back to the server, which I mentioned above. That'd only
>> happen for, say, read, if we're not under FOPEN_DIRECT_IO. I've not
>> looked too closely at FOPEN_DIRECT_IO. In Fuse bpf we currently have
>> bpf mode taking priority. Are there any email threads I should look at
>> for more background there?
> 
> Maybe this patch set:
> https://lore.kernel.org/linux-fsdevel/20240208170603.2078871-1-amir73il@gmail.com/
> 
> Bernd and I worked on it together as a prerequisite to fuse passthrough.
> Benrd has some followup direct_io re-factoring patches.


They are in this branch
https://github.com/bsbernd/linux/commits/fuse-dio-v5/

Going to rebase it to 6.9 this week and will send it out then. I had
been rather occupied with with ddn internal work and didn't have the
time since February...


Thanks,
Bernd