linux-kernel - Re: [RFC PATCH v1 3/3] fuse: implementation of the FUSE_LOOKUP

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Message-ID: <878qfzn1r8.fsf@wotan.olymp>
Date: Fri, 21 Nov 2025 10:00:59 +0000
From: Luis Henriques <luis@...lia.com>
To: Bernd Schubert <bschubert@....com>
Cc: Amir Goldstein <amir73il@...il.com>,  Miklos Szeredi
 <miklos@...redi.hu>,  "Darrick J. Wong" <djwong@...nel.org>,  Kevin Chen
 <kchen@....com>,  Horst Birthelmer <hbirthelmer@....com>,
  "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
  "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,  Matt
 Harvey <mharvey@...ptrading.com>,  "kernel-dev@...lia.com"
 <kernel-dev@...lia.com>
Subject: Re: [RFC PATCH v1 3/3] fuse: implementation of the
 FUSE_LOOKUP_HANDLE operation

On Fri, Nov 21 2025, Bernd Schubert wrote:

> Thanks a lot for this Luis!
>
> On 11/21/25 08:49, Amir Goldstein wrote:
>> On Thu, Nov 20, 2025 at 11:55 AM Luis Henriques <luis@...lia.com> wrote:
>>>
>>> The implementation of LOOKUP_HANDLE simply modifies the LOOKUP operation to
>>> include an extra inarg: the file handle for the parent directory (if it is
>>> available).  Also, because fuse_entry_out now has a extra variable size
>>> struct (the actual handle), it also sets the out_argvar flag to true.
>>>
>>> Most of the other modifications in this patch are a fallout from these
>>> changes: because fuse_entry_out has been modified to include a variable size
>>> struct, every operation that receives such a parameter have to take this
>>> into account:
>>>
>>>   CREATE, LINK, LOOKUP, MKDIR, MKNOD, READDIRPLUS, SYMLINK, TMPFILE
>>>
>> 
>> Overall, this is exactly what I had in mind.
>> Maybe it's utter garbage but that's what I was aiming for ;)
>> 
>> I'd like to get feedback from Miklos and Bernd on the details of the
>> protocol extension, especially w.r.t backward compat aspects.
>
> I will look into it in the late afternoon

That'd be awesome, thanks a lot Bernd!

Cheers,
-- 
Luís