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net/rds: Detect need of On-Demand-Paging memory registration

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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>
This commit is contained in:
Hans Westgaard Ry 2020-01-15 14:43:38 +02:00 committed by Leon Romanovsky
parent 8ffc324851
commit c4c86abb3f
1 changed files with 4 additions and 2 deletions
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6
net/rds/rdma.c
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@ -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]);