Re: [PATCH v4 0/3] FUSE: Implement atomic lookup + open/create

[Miklos Szeredi]

On Thu, 5 May 2022 at 21:59, Vivek Goyal <vgoyal@xxxxxxxxxx> wrote:

> Oh, I have no issues with the intent. I will like to see cut in network
> traffic too (if we can do this without introducing problems). My primary
> interest is that this kind of change should benefit virtiofs as well.

One issue with that appears to be checking permissions.   AFAIU this
patchset only enables the optimization if default_permissions is
turned off (i.e. all permission checking is done by the server).  But
virtiofs uses the default_permissions model.

I'm not quite sure about this limitation, guessing that it's related
to the fact that the permissions may be stale at the time of checking?

Thanks,
Miklos