linux-kernel - Re: [PATCH] ceph: remove ceph_get_direct_page

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Date:   Thu, 2 May 2019 15:46:20 +0200
From:   Ilya Dryomov <idryomov@...il.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Ceph Development <ceph-devel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ceph: remove ceph_get_direct_page_vector

On Wed, May 1, 2019 at 10:43 PM Christoph Hellwig <hch@....de> wrote:
>
> This function is entirely unused.
>
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  include/linux/ceph/libceph.h |  4 ----
>  net/ceph/pagevec.c           | 33 ---------------------------------
>  2 files changed, 37 deletions(-)
>
> diff --git a/include/linux/ceph/libceph.h b/include/linux/ceph/libceph.h
> index 337d5049ff93..a3cddf5f0e60 100644
> --- a/include/linux/ceph/libceph.h
> +++ b/include/linux/ceph/libceph.h
> @@ -299,10 +299,6 @@ int ceph_wait_for_latest_osdmap(struct ceph_client *client,
>
>  /* pagevec.c */
>  extern void ceph_release_page_vector(struct page **pages, int num_pages);
> -
> -extern struct page **ceph_get_direct_page_vector(const void __user *data,
> -                                                int num_pages,
> -                                                bool write_page);
>  extern void ceph_put_page_vector(struct page **pages, int num_pages,
>                                  bool dirty);
>  extern struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags);
> diff --git a/net/ceph/pagevec.c b/net/ceph/pagevec.c
> index d3736f5bffec..64305e7056a1 100644
> --- a/net/ceph/pagevec.c
> +++ b/net/ceph/pagevec.c
> @@ -10,39 +10,6 @@
>
>  #include <linux/ceph/libceph.h>
>
> -/*
> - * build a vector of user pages
> - */
> -struct page **ceph_get_direct_page_vector(const void __user *data,
> -                                         int num_pages, bool write_page)
> -{
> -       struct page **pages;
> -       int got = 0;
> -       int rc = 0;
> -
> -       pages = kmalloc_array(num_pages, sizeof(*pages), GFP_NOFS);
> -       if (!pages)
> -               return ERR_PTR(-ENOMEM);
> -
> -       while (got < num_pages) {
> -               rc = get_user_pages_fast(
> -                   (unsigned long)data + ((unsigned long)got * PAGE_SIZE),
> -                   num_pages - got, write_page, pages + got);
> -               if (rc < 0)
> -                       break;
> -               BUG_ON(rc == 0);
> -               got += rc;
> -       }
> -       if (rc < 0)
> -               goto fail;
> -       return pages;
> -
> -fail:
> -       ceph_put_page_vector(pages, got, false);
> -       return ERR_PTR(rc);
> -}
> -EXPORT_SYMBOL(ceph_get_direct_page_vector);
> -
>  void ceph_put_page_vector(struct page **pages, int num_pages, bool dirty)
>  {
>         int i;

Applied.

Thanks,

                Ilya