linux-kernel - Re: [PATCH 18/21] iomap: Convert iomap_add_to

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Date:   Tue, 2 Nov 2021 00:26:42 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     "Darrick J. Wong" <djwong@...nel.org>, linux-xfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-block@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
        Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH 18/21] iomap: Convert iomap_add_to_ioend to take a folio

On Mon, Nov 01, 2021 at 08:39:26PM +0000, Matthew Wilcox (Oracle) wrote:
> @@ -1431,11 +1428,9 @@ iomap_do_writepage(struct page *page, struct writeback_control *wbc, void *data)
>  	 * |     desired writeback range    |      see else    |
>  	 * ---------------------------------^------------------|
>  	 */
> -	offset = i_size_read(inode);
> -	end_index = offset >> PAGE_SHIFT;
> -	if (page->index < end_index)
> -		end_offset = (loff_t)(page->index + 1) << PAGE_SHIFT;
> -	else {
> +	isize = i_size_read(inode);
> +	end_pos = folio_pos(folio) + folio_size(folio);
> +	if (end_pos - 1 >= isize) {

Looking at the code not part of the context this looks fine.  But I
really wonder if this (and also the blocks change above) would be
better off being split into separate, clearly documented patches.

Otherwise looks good:

Reviewed-by: Christoph Hellwig <hch@....de>