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    Subject[PATCH v2 10/18] fs/io_uring: set FOLL_PIN via pin_user_pages()
    Date
    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>
    Reviewed-by: Jens Axboe <axboe@kernel.dk>
    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 f9a38998f2fc..0f307f2c7cac 100644
    --- a/fs/io_uring.c
    +++ b/fs/io_uring.c
    @@ -3433,9 +3433,8 @@ 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
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