linux-ext4 - Re: [PATCH 3/3] fs: use ->is_partially_uptodate in page_cache_seek_hole

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Date:   Thu, 31 May 2018 09:00:38 +1000
From:   Dave Chinner <david@...morbit.com>
To:     Christoph Hellwig <hch@....de>
Cc:     linux-xfs@...r.kernel.org,
        Andreas Gruenbacher <agruenba@...hat.com>,
        linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 3/3] fs: use ->is_partially_uptodate in
 page_cache_seek_hole_data

On Wed, May 30, 2018 at 12:02:08PM +0200, Christoph Hellwig wrote:
> This way the implementation doesn't depend on buffer_head internals.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  fs/iomap.c | 85 +++++++++++++++++++++++++-----------------------------
>  1 file changed, 39 insertions(+), 46 deletions(-)
> 
> diff --git a/fs/iomap.c b/fs/iomap.c
> index e75153f52748..5b92243808d3 100644
> --- a/fs/iomap.c
> +++ b/fs/iomap.c
> @@ -794,36 +794,51 @@ int iomap_fiemap(struct inode *inode, struct fiemap_extent_info *fi,
>  }
>  EXPORT_SYMBOL_GPL(iomap_fiemap);
>  
> -/*
> - * Seek for SEEK_DATA / SEEK_HOLE within @page, starting at @lastoff.
> - *
> - * Returns the offset within the file on success, and -ENOENT otherwise.
> - */
> -static loff_t
> -page_seek_hole_data(struct page *page, loff_t lastoff, int whence)
> +static bool
> +page_seek_hole_data(struct inode *inode, struct page *page, loff_t *lastoff,
> +		int whence)

Can we keep the comment explaining the return value?

>  {
> -	loff_t offset = page_offset(page);
> -	struct buffer_head *bh, *head;
> +	const struct address_space_operations *ops = inode->i_mapping->a_ops;
> +	unsigned int bsize = i_blocksize(inode), off;

Split this into two lines.

Otherwise looks fine.

Reviewed-by: Dave Chinner <dchinner@...hat.com>

-- 
Dave Chinner
david@...morbit.com