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 <hans.westgaard.ry@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
diff --git a/net/rds/rdma.c b/net/rds/rdma.c
index 916f5ec..eb23c38 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]);