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    Subject[PATCH v5 15/24] 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().

    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().

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

    diff --git a/fs/io_uring.c b/fs/io_uring.c
    index f9a38998f2fc..cff64bd00db9 100644
    --- a/fs/io_uring.c
    +++ b/fs/io_uring.c
    @@ -3433,7 +3433,7 @@ 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) {
    --
    2.24.0
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