Re: [RFC PATCH v3 0/8] fuse: LOOKUP_HANDLE operation

[Luis Henriques]

Hey Horst,

On Wed, Feb 25 2026, Horst Birthelmer wrote:

> On Wed, Feb 25, 2026 at 11:24:31AM +0000, Luis Henriques wrote:
>> Hi,
>> 
>> I'm sending a new version of my work on lookup_handle, even though it's
>> still incomplete.  As suggested elsewhere, it is now based on compound
>> commands and thus it sits on top of Horst's patchset [0].  Also, because
>> this version is a complete re-write of the approach presented in my previous
>> RFC [1] I'm not going to detail what changed.
>> 
>> Here's a few notes:
>> 
>> - The code isn't yet fully testable as there are several pieces missing.
>>   For example, the FUSE_TMPFILE and FUSE_READDIRPLUS operations are not yet
>>   implemented.  The NFS-related changes have also been dropped in this
>>   revision.
>> 
>> - There are several details still to be sorted out in the compound
>>   operations.  For example, the nodeid for the statx operation in the
>>   lookup+statx is set to FUSE_ROOT_ID.
>> 
>> - The second operation (mkobj_handle+statx+open) is still draft (or maybe
>>   just wrong!).  It's not handling flags correctly, and the error handling
>>   has to be better thought out.
>> 
>> - Some of the patches in this set could probably be picked independently
>>   (e.g. patch 4 or even patch 1)
>> 
>> So, why am I sending this broken and incomplete patchset?  Well, simply
>> because I'd feel more confidence getting this approach validated.  I don't
>> expect any through review, but I would appreciate feedback on anything that
>> would help me correct major flaws.
>
> I, personally, appreciate the fact that you sent this out, so I can understand how
> you are using the compounds for this real world problem, and it gives me confidence
> that I'm not completely off with the compounds. 
>
> Do you by any chance have implemented the fuse server part, too, or looked at it?
> I'm just curious.

I do have _something_ for testing, yes.  Obviously, I will eventually
share it but I wasn't planning to share it at this stage yet (it's ugly
and full of debug code).  But if you'd like to have a look I can do a quick
clean-up and push it somewhere.

Cheers,
-- 
Luís