Re: [PATCH] fuse: cleanup request queuing towards virtiofs

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On Thu, 30 May 2024 at 05:20, Jingbo Xu <jefflexu@xxxxxxxxxxxxxxxxx> wrote:

> > +             if (test_bit(FR_FINISHED, &req->flags)) {
> > +                     list_del_init(&req->intr_entry);
> > +                     spin_unlock(&fiq->lock                  ^
>                 missing "return" here?

Well spotted.  Thanks.

> > -             err = -ENODEV;
> > -             spin_unlock(&fiq->lock);
> > -             fuse_put_request(req);
> > -     }
> > +     fuse_send_one(fiq, req);
> >
> > -     return err;
> > +     return 0;
> >  }
>
> There's a minor changed behavior visible to users.  Prior to the patch,
> the FUSE_NOTIFY_RETRIEVE will returns -ENODEV when the connection is
> aborted, but now it returns 0.
>
> It seems only example/notify_store_retrieve.c has used
> FUSE_NOTIFY_RETRIEVE in libfuse.  I'm not sure if this change really
> matters.

It will return -ENOTCONN from  fuse_simple_notify_reply() ->
fuse_get_req().  The -ENODEV would be a very short transient error
during the abort, so it doesn't matter.

Thanks,
Miklos




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