Re: [PATCH 18/34] xfs: use iomap for blocksize == PAGE_SIZE readpage and readpages

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On Wed, May 23, 2018 at 04:43:41PM +0200, Christoph Hellwig wrote:
> For file systems with a block size that equals the page size we never do
> partial reads, so we can use the buffer_head-less iomap versions of
> readpage and readpages without conflicting with the buffer_head structures
> create later in write_begin.
> 
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>

Looks ok,
Reviewed-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>

--D

> ---
>  fs/xfs/xfs_aops.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
> index 56e405572909..c631c457b444 100644
> --- a/fs/xfs/xfs_aops.c
> +++ b/fs/xfs/xfs_aops.c
> @@ -1402,6 +1402,8 @@ xfs_vm_readpage(
>  	struct page		*page)
>  {
>  	trace_xfs_vm_readpage(page->mapping->host, 1);
> +	if (i_blocksize(page->mapping->host) == PAGE_SIZE)
> +		return iomap_readpage(page, &xfs_iomap_ops);
>  	return mpage_readpage(page, xfs_get_blocks);
>  }
>  
> @@ -1413,6 +1415,8 @@ xfs_vm_readpages(
>  	unsigned		nr_pages)
>  {
>  	trace_xfs_vm_readpages(mapping->host, nr_pages);
> +	if (i_blocksize(mapping->host) == PAGE_SIZE)
> +		return iomap_readpages(mapping, pages, nr_pages, &xfs_iomap_ops);
>  	return mpage_readpages(mapping, pages, nr_pages, xfs_get_blocks);
>  }
>  
> -- 
> 2.17.0
> 
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