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

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Date:   Wed, 6 Apr 2022 00:55:10 +0000
From:   Jane Chu <jane.chu@...cle.com>
To:     "Darrick J. Wong" <djwong@...nel.org>,
        Christoph Hellwig <hch@...radead.org>
CC:     Shiyang Ruan <ruansy.fnst@...itsu.com>,
        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>,
        david <david@...morbit.com>
Subject: Re: [PATCH v11 1/8] dax: Introduce holder for dax_device

On 3/30/2022 9:18 AM, Darrick J. Wong wrote:
> On Wed, Mar 30, 2022 at 08:49:29AM -0700, Christoph Hellwig wrote:
>> On Wed, Mar 30, 2022 at 06:58:21PM +0800, Shiyang Ruan wrote:
>>> As the code I pasted before, pmem driver will subtract its ->data_offset,
>>> which is byte-based. And the filesystem who implements ->notify_failure()
>>> will calculate the offset in unit of byte again.
>>>
>>> So, leave its function signature byte-based, to avoid repeated conversions.
>>
>> I'm actually fine either way, so I'll wait for Dan to comment.
> 
> FWIW I'd convinced myself that the reason for using byte units is to
> make it possible to reduce the pmem failure blast radius to subpage
> units... but then I've also been distracted for months. :/
> 

Yes, thanks Darrick!  I recall that.
Maybe just add a comment about why byte unit is used?

thanks!
-jane

> --D