Re: Re: [PATCH] fuse: skip lookup during atomic_open() when O_CREAT is set

[Miklos Szeredi]

On Mon, 23 Feb 2026 at 19:55, Horst Birthelmer <horst@xxxxxxxxxxxxx> wrote:

> What is wrong with a compound doing LOOKUP + MKNOD + OPEN?
> If the fuse server knows how to process that 'group' atomically
> in one big step it will do the right thing,
> if not, we will call those in series and sort out the data
> in kernel afterwards.
>
> If we preserve all flags and the real results we can do pretty
> much exactly the same thing that is done at the moment with just
> one call to user space.
>
> That was actually what I was experimenting with.
>
> The MKNOD in the middle is optional depending on the O_CREAT flag.

Okay, I won't stop you experimenting.

My thinking is that it's simpler as a separate op (dir handle and name
are the same for LOOKUP and MKNOD).   But adding this special "stop if
error or non-regular, else skip create if positive" dependency would
also work.

Thanks,
Miklos