linux-kernel - Re: [PATCH v3 5/6] hugetlbfs: convert hugetlb_delete_from_page

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Date:   Mon, 19 Sep 2022 15:33:17 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     Sidhartha Kumar <sidhartha.kumar@...cle.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        akpm@...ux-foundation.org, songmuchun@...edance.com,
        willy@...radead.org, vbabka@...e.cz, william.kucharski@...cle.com,
        dhowells@...hat.com, peterx@...hat.com, arnd@...db.de,
        ccross@...gle.com, hughd@...gle.com, ebiederm@...ssion.com
Subject: Re: [PATCH v3 5/6] hugetlbfs: convert
 hugetlb_delete_from_page_cache() to use folios

On 09/08/22 12:37, Sidhartha Kumar wrote:
> Removes the last caller of delete_from_page_cache() by converting the
> code to its folio equivalent.

Changes below look fine.

However, if this patch removes the last caller of delete_from_page_cache()
then I think it should also remove delete_from_page_cache?
-- 
Mike Kravetz

> 
> Signed-off-by: Sidhartha Kumar <sidhartha.kumar@...cle.com>
> ---
>  fs/hugetlbfs/inode.c | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
> index d9e08c445e2f..38920702765e 100644
> --- a/fs/hugetlbfs/inode.c
> +++ b/fs/hugetlbfs/inode.c
> @@ -364,11 +364,11 @@ static int hugetlbfs_write_end(struct file *file, struct address_space *mapping,
>  	return -EINVAL;
>  }
>  
> -static void hugetlb_delete_from_page_cache(struct page *page)
> +static void hugetlb_delete_from_page_cache(struct folio *folio)
>  {
> -	ClearPageDirty(page);
> -	ClearPageUptodate(page);
> -	delete_from_page_cache(page);
> +	folio_clear_dirty(folio);
> +	folio_clear_uptodate(folio);
> +	filemap_remove_folio(folio);
>  }
>  
>  /*
> @@ -562,8 +562,8 @@ static bool remove_inode_single_folio(struct hstate *h, struct inode *inode,
>  		 * map could fail.  Correspondingly, the subpool and global
>  		 * reserve usage count can need to be adjusted.
>  		 */
> -		VM_BUG_ON(HPageRestoreReserve(&folio->page));
> -		hugetlb_delete_from_page_cache(&folio->page);
> +		VM_BUG_ON_FOLIO(folio_test_hugetlb_restore_reserve(folio), folio);
> +		hugetlb_delete_from_page_cache(folio);
>  		ret = true;
>  		if (!truncate_op) {
>  			if (unlikely(hugetlb_unreserve_pages(inode, index,
> @@ -1174,7 +1174,7 @@ static int hugetlbfs_error_remove_page(struct address_space *mapping,
>  	struct inode *inode = mapping->host;
>  	pgoff_t index = page->index;
>  
> -	hugetlb_delete_from_page_cache(page);
> +	hugetlb_delete_from_page_cache(page_folio(page));
>  	if (unlikely(hugetlb_unreserve_pages(inode, index, index + 1, 1)))
>  		hugetlb_fix_reserve_counts(inode);
>  
> -- 
> 2.31.1
>