linux-kernel - Re: [PATCH v9 1/3] xfs: fix the calculation of length and end

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Message-ID: <Y9+WHXyA2GufLWpw@casper.infradead.org>
Date:   Sun, 5 Feb 2023 11:42:21 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Shiyang Ruan <ruansy.fnst@...itsu.com>
Cc:     linux-kernel@...r.kernel.org, linux-xfs@...r.kernel.org,
        nvdimm@...ts.linux.dev, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org, djwong@...nel.org,
        dan.j.williams@...el.com, david@...morbit.com, hch@...radead.org,
        jane.chu@...cle.com
Subject: Re: [PATCH v9 1/3] xfs: fix the calculation of length and end

On Sat, Feb 04, 2023 at 02:58:36PM +0000, Shiyang Ruan wrote:
> @@ -222,8 +222,8 @@ xfs_dax_notify_failure(
>  		len -= ddev_start - offset;
>  		offset = 0;
>  	}
> -	if (offset + len > ddev_end)
> -		len -= ddev_end - offset;
> +	if (offset + len - 1 > ddev_end)
> +		len -= offset + len - 1 - ddev_end;

This _looks_ wrong.  Are you sure it shouldn't be:

		len = ddev_end - offset + 1;