linux-kernel - Re: [PATCH v6] iomap: support tail packing inline read

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Message-ID: <YPrauRjG7+vCw7f9@casper.infradead.org>
Date:   Fri, 23 Jul 2021 16:05:29 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Gao Xiang <hsiangkao@...ux.alibaba.com>,
        linux-erofs@...ts.ozlabs.org, linux-fsdevel@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        "Darrick J . Wong" <djwong@...nel.org>,
        Andreas Gruenbacher <andreas.gruenbacher@...il.com>
Subject: Re: [PATCH v6] iomap: support tail packing inline read

On Thu, Jul 22, 2021 at 07:39:47AM +0200, Christoph Hellwig wrote:
> @@ -675,7 +676,7 @@ static size_t iomap_write_end_inline(struct inode *inode, struct page *page,
>  
>  	flush_dcache_page(page);
>  	addr = kmap_atomic(page);
> -	memcpy(iomap->inline_data + pos, addr + pos, copied);
> +	memcpy(iomap_inline_buf(iomap, pos), addr + pos, copied);

This is wrong; pos can be > PAGE_SIZE, so this needs to be
addr + offset_in_page(pos).