linux-kernel - Re: [PATCH 4/5] hugetlbfs: cleanup some comments in inode.c

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Date:   Fri, 22 Jul 2022 14:38:27 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     akpm@...ux-foundation.org, songmuchun@...edance.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] hugetlbfs: cleanup some comments in inode.c

On 07/22/22 14:19, Miaohe Lin wrote:
> On 2022/7/22 7:23, Mike Kravetz wrote:
> > On 07/21/22 21:16, Miaohe Lin wrote:
> >> The function generic_file_buffered_read has been renamed to filemap_read
> >> since commit 87fa0f3eb267 ("mm/filemap: rename generic_file_buffered_read
> >> to filemap_read"). Update the corresponding comment. And duplicated taken
> >> in hugetlbfs_fill_super is removed.
> >>
> >> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
> >> ---
> >>  fs/hugetlbfs/inode.c | 6 +++---
> >>  1 file changed, 3 insertions(+), 3 deletions(-)
> >>
> >> diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
> >> index aa7a5b8fc724..19fc62a9c2fe 100644
> >> --- a/fs/hugetlbfs/inode.c
> >> +++ b/fs/hugetlbfs/inode.c
> >> @@ -313,8 +313,8 @@ hugetlbfs_read_actor(struct page *page, unsigned long offset,
> >>  
> >>  /*
> >>   * Support for read() - Find the page attached to f_mapping and copy out the
> >> - * data. Its *very* similar to generic_file_buffered_read(), we can't use that
> >> - * since it has PAGE_SIZE assumptions.
> >> + * data. Its *very* similar to filemap_read(), we can't use that since it has
> >> + * PAGE_SIZE assumptions.
> > 
> > Since you are changing the comment, I would just say this provides
> > functionality similar to filemap_read().  filemap_read is now operating
> > on folios which may remove any PAGE_SIZE assumptions.  One day when
> > hugetlb is converted to folios it may end up using filemap_read instead
> > of hugetlbfs_read_actor.
> 
> Sounds reasonable.
> 
> > 
> 
> Do you mean changing the comment of hugetlbfs_read_iter like below ?
> 
> /*
>  * Support for read() - Find the page attached to f_mapping and copy out the
>  * data. This provides functionality similar to filemap_read().
>  */
> static ssize_t hugetlbfs_read_iter(struct kiocb *iocb, struct iov_iter *to)
> 

Exactly!

With such a change, you can add:

Reviewed-by: Mike Kravetz <mike.kravetz@...cle.com>

-- 
Mike Kravetz