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

On Wed, Oct 30, 2019 at 03:49:21PM -0700, John Hubbard wrote:

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().

Reviewed-by: Ira Weiny ira.weiny@intel.com

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