linux-ext4 - Re: [PATCH v7 06/24] mm: Rename various 'offset' parameters to 'index'

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Date:   Thu, 20 Feb 2020 19:27:03 -0800
From:   John Hubbard <jhubbard@...dia.com>
To:     Matthew Wilcox <willy@...radead.org>,
        <linux-fsdevel@...r.kernel.org>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <linux-btrfs@...r.kernel.org>, <linux-erofs@...ts.ozlabs.org>,
        <linux-ext4@...r.kernel.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>,
        <cluster-devel@...hat.com>, <ocfs2-devel@....oracle.com>,
        <linux-xfs@...r.kernel.org>
Subject: Re: [PATCH v7 06/24] mm: Rename various 'offset' parameters to
 'index'

On 2/19/20 1:00 PM, Matthew Wilcox wrote:
> From: "Matthew Wilcox (Oracle)" <willy@...radead.org>
> 
> The word 'offset' is used ambiguously to mean 'byte offset within
> a page', 'byte offset from the start of the file' and 'page offset
> from the start of the file'.  Use 'index' to mean 'page offset
> from the start of the file' throughout the readahead code.
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> ---
>  mm/readahead.c | 86 ++++++++++++++++++++++++--------------------------
>  1 file changed, 42 insertions(+), 44 deletions(-)
> 
> diff --git a/mm/readahead.c b/mm/readahead.c
> index 6a9d99229bd6..096cf9020648 100644
> --- a/mm/readahead.c
> +++ b/mm/readahead.c
> @@ -156,7 +156,7 @@ static void read_pages(struct readahead_control *rac, struct list_head *pages,
>   * We really don't want to intermingle reads and writes like that.
>   */
>  void __do_page_cache_readahead(struct address_space *mapping,
> -		struct file *filp, pgoff_t offset, unsigned long nr_to_read,
> +		struct file *filp, pgoff_t index, unsigned long nr_to_read,
>  		unsigned long lookahead_size)


One more tiny thing: seeing as how this patch is also changing "size" to "count",
maybe it should also change lookahead_size to lookahead_count.


thanks,
-- 
John Hubbard
NVIDIA