diff mbox series

[v2,12/19] fs/io_uring: set FOLL_PIN via pin_user_pages()

Message ID 20191125231035.1539120-13-jhubbard@nvidia.com (mailing list archive)
State New
Headers show
Series pin_user_pages(): reduced-risk series for Linux 5.5 | expand

Commit Message

John Hubbard Nov. 25, 2019, 11:10 p.m. UTC 
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().

In partial anticipation of this work, the io_uring code was already
calling put_user_page() instead of put_page(). Therefore, in order to
convert from the get_user_pages()/put_page() model, to the
pin_user_pages()/put_user_page() model, the only change required
here is to change get_user_pages() to pin_user_pages().

Reviewed-by: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
---
 fs/io_uring.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/fs/io_uring.c b/fs/io_uring.c
index e5bff60f61d6..869191d8f8d4 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -4239,7 +4239,7 @@  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,
+		pret = pin_user_pages(ubuf, nr_pages,
 				      FOLL_WRITE | FOLL_LONGTERM,
 				      pages, vmas);
 		if (pret == nr_pages) {