linux-ext4 - Re: [PATCH 08/26] gfs2: Convert gfs2_write_buf_to

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Date:   Wed, 20 Sep 2023 00:32:12 +0200
From:   Andreas Gruenbacher <agruenba@...hat.com>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-fsdevel@...r.kernel.org, gfs2@...ts.linux.dev,
        linux-nilfs@...r.kernel.org, linux-ntfs-dev@...ts.sourceforge.net,
        ntfs3@...ts.linux.dev, ocfs2-devel@...ts.linux.dev,
        reiserfs-devel@...r.kernel.org, linux-ext4@...r.kernel.org,
        Pankaj Raghav <p.raghav@...sung.com>
Subject: Re: [PATCH 08/26] gfs2: Convert gfs2_write_buf_to_page() to use a folio

On Tue, Sep 19, 2023 at 7:00 AM Matthew Wilcox (Oracle)
<willy@...radead.org> wrote:
> Remove several folio->page->folio conversions.
>
> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> ---
>  fs/gfs2/quota.c | 37 +++++++++++++++++++------------------
>  1 file changed, 19 insertions(+), 18 deletions(-)
>
> diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
> index 171b2713d2e5..0ee4865ebdca 100644
> --- a/fs/gfs2/quota.c
> +++ b/fs/gfs2/quota.c
> @@ -736,7 +736,7 @@ static int gfs2_write_buf_to_page(struct gfs2_sbd *sdp, unsigned long index,
>         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
>         struct inode *inode = &ip->i_inode;
>         struct address_space *mapping = inode->i_mapping;
> -       struct page *page;
> +       struct folio *folio;
>         struct buffer_head *bh;
>         u64 blk;
>         unsigned bsize = sdp->sd_sb.sb_bsize, bnum = 0, boff = 0;
> @@ -745,15 +745,15 @@ static int gfs2_write_buf_to_page(struct gfs2_sbd *sdp, unsigned long index,
>         blk = index << (PAGE_SHIFT - sdp->sd_sb.sb_bsize_shift);
>         boff = off % bsize;
>
> -       page = grab_cache_page(mapping, index);
> -       if (!page)
> -               return -ENOMEM;
> -       if (!page_has_buffers(page))
> -               create_empty_buffers(page, bsize, 0);
> +       folio = filemap_grab_folio(mapping, index);
> +       if (IS_ERR(folio))
> +               return PTR_ERR(folio);
> +       bh = folio_buffers(folio);
> +       if (!bh)
> +               bh = folio_create_empty_buffers(folio, bsize, 0);
>
> -       bh = page_buffers(page);
> -       for(;;) {
> -               /* Find the beginning block within the page */
> +       for (;;) {
> +               /* Find the beginning block within the folio */
>                 if (pg_off >= ((bnum * bsize) + bsize)) {
>                         bh = bh->b_this_page;
>                         bnum++;
> @@ -766,9 +766,10 @@ static int gfs2_write_buf_to_page(struct gfs2_sbd *sdp, unsigned long index,
>                                 goto unlock_out;
>                         /* If it's a newly allocated disk block, zero it */
>                         if (buffer_new(bh))
> -                               zero_user(page, bnum * bsize, bh->b_size);
> +                               folio_zero_range(folio, bnum * bsize,
> +                                               bh->b_size);
>                 }
> -               if (PageUptodate(page))
> +               if (folio_test_uptodate(folio))
>                         set_buffer_uptodate(bh);
>                 if (bh_read(bh, REQ_META | REQ_PRIO) < 0)
>                         goto unlock_out;
> @@ -784,17 +785,17 @@ static int gfs2_write_buf_to_page(struct gfs2_sbd *sdp, unsigned long index,
>                 break;
>         }
>
> -       /* Write to the page, now that we have setup the buffer(s) */
> -       memcpy_to_page(page, off, buf, bytes);
> -       flush_dcache_page(page);
> -       unlock_page(page);
> -       put_page(page);
> +       /* Write to the folio, now that we have setup the buffer(s) */
> +       memcpy_to_folio(folio, off, buf, bytes);
> +       flush_dcache_folio(folio);
> +       folio_unlock(folio);
> +       folio_put(folio);
>
>         return 0;
>
>  unlock_out:
> -       unlock_page(page);
> -       put_page(page);
> +       folio_unlock(folio);
> +       folio_put(folio);
>         return -EIO;
>  }
>
> --
> 2.40.1
>

Reviewed-by: Andreas Gruenbacher <agruenba@...hat.com>

Thanks,
Andreas