Re: [PATCH v7 2/8] iov_iter: Add a function to extract a page list from an iterator

[John Hubbard]

On 1/23/23 08:11, Jan Kara wrote:
> > For cifs RDMA, do I need to make it pass in FOLL_LONGTERM?  And does that need
> > a special cleanup?
>
> FOLL_LONGTERM doesn't need a special cleanup AFAIK. It should be used
> whenever there isn't reasonably bound time after which the page is
> unpinned. So in case CIFS sets up RDMA and then it is up to userspace how
> long the RDMA is going to be running it should be using FOLL_LONGTERM. The

Yes, we have been pretty consistently deciding that RDMA generally
implies FOLL_LONGTERM. (And furthermore, FOLL_LONGTERM implies
FOLL_PIN--that one is actually enforced by the gup/pup APIs.)


thanks,
--
John Hubbard
NVIDIA