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From: Dave Chinner <david@fromorbit.com>
To: Matthew Wilcox <willy@infradead.org>
Cc: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4 10/36] fs: Make page_mkwrite_check_truncate thp-aware
Date: Fri, 22 May 2020 08:01:39 +1000	[thread overview]
Message-ID: <20200521220139.GS2005@dread.disaster.area> (raw)
In-Reply-To: <20200515131656.12890-11-willy@infradead.org>

On Fri, May 15, 2020 at 06:16:30AM -0700, Matthew Wilcox wrote:
> From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
> 
> If the page is compound, check the last index in the page and return
> the appropriate size.  Change the return type to ssize_t in case we ever
> support pages larger than 2GB.
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
> ---
>  include/linux/pagemap.h | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
> index 1a0bb387948c..c75d7fb7ccbc 100644
> --- a/include/linux/pagemap.h
> +++ b/include/linux/pagemap.h
> @@ -827,22 +827,22 @@ static inline unsigned long dir_pages(struct inode *inode)
>   * @page: the page to check
>   * @inode: the inode to check the page against
>   *
> - * Returns the number of bytes in the page up to EOF,
> + * Return: The number of bytes in the page up to EOF,
>   * or -EFAULT if the page was truncated.
>   */
> -static inline int page_mkwrite_check_truncate(struct page *page,
> +static inline ssize_t page_mkwrite_check_truncate(struct page *page,
>  					      struct inode *inode)
>  {
>  	loff_t size = i_size_read(inode);
>  	pgoff_t index = size >> PAGE_SHIFT;
> -	int offset = offset_in_page(size);
> +	unsigned long offset = offset_in_thp(page, size);
>  
>  	if (page->mapping != inode->i_mapping)
>  		return -EFAULT;
>  
>  	/* page is wholly inside EOF */
> -	if (page->index < index)
> -		return PAGE_SIZE;
> +	if (page->index + hpage_nr_pages(page) - 1 < index)
> +		return thp_size(page);

Can we make these interfaces all use the same namespace prefix?
Here we have a mix of thp and hpage and I have no clue how hpages
are different to thps. If they refer to the same thing (i.e. huge
pages) then can we please make the API consistent before splattering
it all over the filesystem code?

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

  reply	other threads:[~2020-05-21 22:01 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-15 13:16 [PATCH v4 00/36] Large pages in the page cache Matthew Wilcox
2020-05-15 13:16 ` [PATCH v4 01/36] mm: Move PageDoubleMap bit Matthew Wilcox
2020-05-15 13:16 ` [PATCH v4 02/36] mm: Simplify PageDoubleMap with PF_SECOND policy Matthew Wilcox
2020-05-15 13:16 ` [PATCH v4 03/36] mm: Allow hpages to be arbitrary order Matthew Wilcox
2020-05-28 14:19   ` Zi Yan
2020-05-15 13:16 ` [PATCH v4 04/36] mm: Introduce thp_size Matthew Wilcox
2020-05-15 13:38   ` David Hildenbrand
2020-05-15 13:16 ` [PATCH v4 05/36] mm: Introduce thp_order Matthew Wilcox
2020-05-15 13:16 ` [PATCH v4 06/36] mm: Introduce offset_in_thp Matthew Wilcox
2020-05-15 13:39   ` David Hildenbrand
2020-05-22 17:15   ` Kirill A. Shutemov
2020-05-29 12:59     ` Matthew Wilcox
2020-05-15 13:16 ` [PATCH v4 07/36] fs: Add a filesystem flag for large pages Matthew Wilcox
2020-05-21 21:55   ` Dave Chinner
2020-05-21 23:29     ` Matthew Wilcox
2020-05-15 13:16 ` [PATCH v4 08/36] fs: Do not update nr_thps for large page mappings Matthew Wilcox
2020-05-15 13:16 ` [PATCH v4 09/36] fs: Introduce i_blocks_per_page Matthew Wilcox
2020-05-15 13:16 ` [PATCH v4 10/36] fs: Make page_mkwrite_check_truncate thp-aware Matthew Wilcox
2020-05-21 22:01   ` Dave Chinner [this message]
2020-05-21 23:30     ` Matthew Wilcox
2020-05-15 13:16 ` [PATCH v4 11/36] fs: Support THPs in zero_user_segments Matthew Wilcox
2020-05-25  4:55   ` Kirill A. Shutemov
2020-05-15 13:16 ` [PATCH v4 12/36] bio: Add bio_for_each_thp_segment_all Matthew Wilcox
2020-05-15 13:16 ` [PATCH v4 13/36] iomap: Support arbitrarily many blocks per page Matthew Wilcox
2020-05-15 13:16 ` [PATCH v4 14/36] iomap: Support large pages in iomap_adjust_read_range Matthew Wilcox
2020-05-21 22:24   ` Dave Chinner
2020-05-21 23:39     ` Matthew Wilcox
2020-05-15 13:16 ` [PATCH v4 15/36] iomap: Support large pages in read paths Matthew Wilcox
2020-05-15 13:16 ` [PATCH v4 16/36] iomap: Support large pages in write paths Matthew Wilcox
2020-05-15 13:16 ` [PATCH v4 17/36] iomap: Inline data shouldn't see large pages Matthew Wilcox
2020-05-15 13:16 ` [PATCH v4 18/36] iomap: Handle tail pages in iomap_page_mkwrite Matthew Wilcox
2020-05-15 13:16 ` [PATCH v4 19/36] xfs: Support large pages Matthew Wilcox
2020-05-15 13:16 ` [PATCH v4 20/36] mm: Make prep_transhuge_page return its argument Matthew Wilcox
2020-05-15 13:16 ` [PATCH v4 21/36] mm: Add __page_cache_alloc_order Matthew Wilcox
2020-05-15 13:16 ` [PATCH v4 22/36] mm: Allow large pages to be added to the page cache Matthew Wilcox
2020-05-15 13:16 ` [PATCH v4 23/36] mm: Allow large pages to be removed from " Matthew Wilcox
2020-05-15 13:16 ` [PATCH v4 24/36] mm: Remove page fault assumption of compound page size Matthew Wilcox
2020-05-25  4:59   ` Kirill A. Shutemov
2020-05-15 13:16 ` [PATCH v4 25/36] mm: Fix total_mapcount assumption of " Matthew Wilcox
2020-05-15 13:16 ` [PATCH v4 26/36] mm: Avoid splitting large pages Matthew Wilcox
2020-05-15 13:16 ` [PATCH v4 27/36] mm: Fix truncation for pages of arbitrary size Matthew Wilcox
2020-05-15 13:16 ` [PATCH v4 28/36] mm: Support storing shadow entries for large pages Matthew Wilcox
2020-05-15 13:16 ` [PATCH v4 29/36] mm: Support retrieving tail pages from the page cache Matthew Wilcox
2020-05-15 13:16 ` [PATCH v4 30/36] mm: Support tail pages in wait_for_stable_page Matthew Wilcox
2020-05-15 13:16 ` [PATCH v4 31/36] mm: Add DEFINE_READAHEAD Matthew Wilcox
2020-05-15 13:16 ` [PATCH v4 32/36] mm: Make page_cache_readahead_unbounded take a readahead_control Matthew Wilcox
2020-05-15 13:16 ` [PATCH v4 33/36] mm: Make __do_page_cache_readahead " Matthew Wilcox
2020-05-15 13:16 ` [PATCH v4 34/36] mm: Allow PageReadahead to be set on head pages Matthew Wilcox
2020-05-15 13:16 ` [PATCH v4 35/36] mm: Add large page readahead Matthew Wilcox
2020-05-15 13:16 ` [PATCH v4 36/36] mm: Align THP mappings for non-DAX Matthew Wilcox
2020-05-26 22:05   ` William Kucharski
2020-05-26 22:20     ` Matthew Wilcox
2020-05-21 22:49 ` [PATCH v4 00/36] Large pages in the page cache Dave Chinner
2020-05-22  0:04   ` Matthew Wilcox
2020-05-22  2:57     ` Dave Chinner
2020-05-22  3:05       ` Matthew Wilcox
2020-05-25 23:07         ` Dave Chinner
2020-05-26  1:21           ` Matthew Wilcox
2020-05-28 11:00 ` William Kucharski

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