[v9,15/25] fs/io_uring: set FOLL_PIN via pin_user_pages()
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Message ID 20191211025318.457113-16-jhubbard@nvidia.com
State New
Headers show
  • mm/gup: track dma-pinned pages: FOLL_PIN
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Commit Message

John Hubbard Dec. 11, 2019, 2:53 a.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

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(-)

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diff --git a/fs/io_uring.c b/fs/io_uring.c
index 405be10da73d..9639ebc21e8a 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -4521,7 +4521,7 @@  static int io_sqe_buffer_register(struct io_ring_ctx *ctx, void __user *arg,
 		ret = 0;
-		pret = get_user_pages(ubuf, nr_pages,
+		pret = pin_user_pages(ubuf, nr_pages,
 				      pages, vmas);
 		if (pret == nr_pages) {