On 1/23/23 08:11, Jan Kara wrote:

quoted

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