linux-kernel - Re: [PATCH v11 1/8] dax: Introduce holder for dax

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Message-ID: <YkQtOO/Z3SZ2Pksg@infradead.org>
Date:   Wed, 30 Mar 2022 03:13:12 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Shiyang Ruan <ruansy.fnst@...itsu.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-xfs <linux-xfs@...r.kernel.org>,
        Linux NVDIMM <nvdimm@...ts.linux.dev>,
        Linux MM <linux-mm@...ck.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        "Darrick J. Wong" <djwong@...nel.org>, david <david@...morbit.com>,
        Jane Chu <jane.chu@...cle.com>
Subject: Re: [PATCH v11 1/8] dax: Introduce holder for dax_device

On Wed, Mar 30, 2022 at 06:03:01PM +0800, Shiyang Ruan wrote:
> 
> Because I am not sure if the offset between each layer is page aligned.  For
> example, when pmem dirver handles ->memory_failure(), it should subtract its
> ->data_offset when it calls dax_holder_notify_failure().

If they aren't, none of the DAX machinery would work.