linux-kernel - Re: [PATCH 0/2] RFC: Set backing file at lookup

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Message-ID: <CAOQ4uxgYgbzcR1XV1kM6hEis6Lfnbo0xWYzdc0exAAPq-M6rew@mail.gmail.com>
Date: Sun, 10 Aug 2025 16:32:50 +0200
From: Amir Goldstein <amir73il@...il.com>
To: Paul Lawrence <paullawrence@...gle.com>
Cc: bernd.schubert@...tmail.fm, linux-fsdevel@...r.kernel.org, 
	linux-kernel@...r.kernel.org, miklos@...redi.hu
Subject: Re: [PATCH 0/2] RFC: Set backing file at lookup

On Sun, Aug 10, 2025 at 3:25 PM Amir Goldstein <amir73il@...il.com> wrote:
>
> On Mon, Aug 4, 2025 at 7:32 PM Paul Lawrence <paullawrence@...gle.com> wrote:
> >
> > Based on our discussion, I put together two simple patches.
> >
> > The first adds an optional extra parameter to FUSE_LOOKUP outargs. This allows
> > the daemon to set a backing file at lookup time on a successful lookup.
> >
> > I then looked at which opcodes do not require a file handle. The simplest seem
> > to be FUSE_MKDIR and FUSE_RMDIR. So I implemented passthrough handling for these
> > opcodes in the second patch.
> >
> > Both patches sit on top of Amir's tree at:
> >
> > https://github.com/amir73il/linux/commit/ceaf7f16452f6aaf7993279b1c10e727d6bf6a32
> >
>
> I think you based your patches on ceaf7f16452f^ and patch 1/2 replaces commit
> ceaf7f16452f ("fuse: support setting backing inode passthrough on getattr")
>
> Right?
>
> That makes sense to me because that last patch was a hacky API,
> but then you made some other changes to my patch which I did not understand why.

Push a new version of fuse-backing-inode-wip based on
https://github.com/amir73il/libfuse/commits/fuse_passthrough_iops/

Please base your work on the above branch with the helpers instead of
modifying them.

Thanks,
Amir.