From c4c86abb3f9fb3d5bc113fb996298a30ec63e07b Mon Sep 17 00:00:00 2001 From: Hans Westgaard Ry Date: Wed, 15 Jan 2020 14:43:38 +0200 Subject: [PATCH] net/rds: Detect need of On-Demand-Paging memory registration Add code to check if memory intended for RDMA is FS-DAX-memory. RDS will fail with error code EOPNOTSUPP if FS-DAX-memory is detected. Signed-off-by: Hans Westgaard Ry Acked-by: Santosh Shilimkar Signed-off-by: Leon Romanovsky --- net/rds/rdma.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/net/rds/rdma.c b/net/rds/rdma.c index 916f5ec373d8..eb23c38ce2b3 100644 --- a/net/rds/rdma.c +++ b/net/rds/rdma.c @@ -156,11 +156,13 @@ void rds_rdma_drop_keys(struct rds_sock *rs) static int rds_pin_pages(unsigned long user_addr, unsigned int nr_pages, struct page **pages, int write) { + unsigned int gup_flags = FOLL_LONGTERM; int ret; - ret = get_user_pages_fast(user_addr, nr_pages, write ? FOLL_WRITE : 0, - pages); + if (write) + gup_flags |= FOLL_WRITE; + ret = get_user_pages_fast(user_addr, nr_pages, gup_flags, pages); if (ret >= 0 && ret < nr_pages) { while (ret--) put_page(pages[ret]); -- 2.30.2