[PATCH 10/19] fs/io_uring: set FOLL_PIN via pin_user_pages()

John Hubbard
2019-10-30T22:49:54Z

Convert fs/io_uring to use the new pin_user_pages() call, which sets
FOLL_PIN. Setting FOLL_PIN is now required for code that requires
tracking of pinned pages, and therefore for any code that calls
put_user_page().

Signed-off-by: John Hubbard <jhubbard@nvidia.com>
---
fs/io_uring.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index a30c4f622cb3..d3924b1760eb 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -3431,9 +3431,8 @@ static int io_sqe_buffer_register(struct io_ring_ctx *ctx, void __user *arg,

ret = 0;
down_read(&current->mm->mmap_sem);
- pret = get_user_pages(ubuf, nr_pages,
- FOLL_WRITE | FOLL_LONGTERM,
- pages, vmas);
+ pret = pin_longterm_pages(ubuf, nr_pages, FOLL_WRITE, pages,
+ vmas);
if (pret == nr_pages) {
/* don't support file backed memory */
for (j = 0; j < nr_pages; j++) {
--
2.23.0