[PATCH v6] iomap: support tail packing inline read

[Matthew Wilcox]

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).