Re: [PATCH 10/26] nilfs2: Convert nilfs_grab_buffer() to use a folio

[Ryusuke Konishi <konishi.ryusuke@xxxxxxxxx>]

On Tue, Sep 19, 2023 at 7:20 PM Matthew Wilcox (Oracle) wrote:
>
> Remove a number of folio->page->folio conversions.
>
> Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
> ---
>  fs/nilfs2/page.c | 26 +++++++++++++-------------
>  1 file changed, 13 insertions(+), 13 deletions(-)
>
> diff --git a/fs/nilfs2/page.c b/fs/nilfs2/page.c
> index b4e54d079b7d..1c075bd906c9 100644
> --- a/fs/nilfs2/page.c
> +++ b/fs/nilfs2/page.c
> @@ -25,19 +25,19 @@
>         (BIT(BH_Uptodate) | BIT(BH_Mapped) | BIT(BH_NILFS_Node) |       \
>          BIT(BH_NILFS_Volatile) | BIT(BH_NILFS_Checked))
>
> -static struct buffer_head *
> -__nilfs_get_page_block(struct page *page, unsigned long block, pgoff_t index,
> -                      int blkbits, unsigned long b_state)
> +static struct buffer_head *__nilfs_get_folio_block(struct folio *folio,
> +               unsigned long block, pgoff_t index, int blkbits,
> +               unsigned long b_state)
>
>  {
>         unsigned long first_block;
> -       struct buffer_head *bh;
> +       struct buffer_head *bh = folio_buffers(folio);
>
> -       if (!page_has_buffers(page))
> -               create_empty_buffers(page, 1 << blkbits, b_state);
> +       if (!bh)
> +               bh = folio_create_empty_buffers(folio, 1 << blkbits, b_state);
>
>         first_block = (unsigned long)index << (PAGE_SHIFT - blkbits);
> -       bh = nilfs_page_get_nth_block(page, block - first_block);
> +       bh = get_nth_bh(bh, block - first_block);
>
>         touch_buffer(bh);
>         wait_on_buffer(bh);
> @@ -51,17 +51,17 @@ struct buffer_head *nilfs_grab_buffer(struct inode *inode,
>  {
>         int blkbits = inode->i_blkbits;
>         pgoff_t index = blkoff >> (PAGE_SHIFT - blkbits);
> -       struct page *page;
> +       struct folio *folio;
>         struct buffer_head *bh;
>
> -       page = grab_cache_page(mapping, index);
> -       if (unlikely(!page))
> +       folio = filemap_grab_folio(mapping, index);
> +       if (IS_ERR(folio))
>                 return NULL;
>
> -       bh = __nilfs_get_page_block(page, blkoff, index, blkbits, b_state);
> +       bh = __nilfs_get_folio_block(folio, blkoff, index, blkbits, b_state);
>         if (unlikely(!bh)) {
> -               unlock_page(page);
> -               put_page(page);
> +               folio_unlock(folio);
> +               folio_put(folio);
>                 return NULL;
>         }
>         return bh;
> --
> 2.40.1
>

Acked-by: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxx>

Looks good to me.

Thanks,
Ryusuke Konishi