From: Jane Chu <jane.chu@oracle.com>
To: "Darrick J. Wong" <djwong@kernel.org>,
Christoph Hellwig <hch@infradead.org>
Cc: Shiyang Ruan <ruansy.fnst@fujitsu.com>,
Dan Williams <dan.j.williams@intel.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-xfs <linux-xfs@vger.kernel.org>,
Linux NVDIMM <nvdimm@lists.linux.dev>,
Linux MM <linux-mm@kvack.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
david <david@fromorbit.com>
Subject: Re: [PATCH v11 1/8] dax: Introduce holder for dax_device
Date: Wed, 6 Apr 2022 00:55:10 +0000 [thread overview]
Message-ID: <fd37cde6-318a-9faf-9bff-70bb8e5d3241@oracle.com> (raw)
In-Reply-To: <20220330161812.GA27649@magnolia>
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
next prev parent reply other threads:[~2022-04-06 0:55 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-27 12:07 [PATCH v11 0/8] fsdax: introduce fs query to support reflink Shiyang Ruan
2022-02-27 12:07 ` [PATCH v11 1/8] dax: Introduce holder for dax_device Shiyang Ruan
2022-03-11 23:35 ` Dan Williams
2022-03-16 13:46 ` Shiyang Ruan
2022-03-30 5:41 ` Christoph Hellwig
2022-03-30 10:03 ` Shiyang Ruan
2022-03-30 10:13 ` Christoph Hellwig
2022-03-30 10:58 ` Shiyang Ruan
2022-03-30 15:49 ` Christoph Hellwig
2022-03-30 16:18 ` Darrick J. Wong
2022-04-06 0:55 ` Jane Chu [this message]
2022-04-06 1:22 ` Dan Williams
2022-04-06 20:39 ` Darrick J. Wong
2022-04-08 1:38 ` Dan Williams
2022-04-08 5:59 ` Shiyang Ruan
2022-03-30 5:41 ` Christoph Hellwig
2022-02-27 12:07 ` [PATCH v11 2/8] mm: factor helpers for memory_failure_dev_pagemap Shiyang Ruan
2022-02-27 12:07 ` [PATCH v11 3/8] pagemap,pmem: Introduce ->memory_failure() Shiyang Ruan
2022-02-27 12:07 ` [PATCH v11 4/8] fsdax: Introduce dax_lock_mapping_entry() Shiyang Ruan
2022-02-27 12:07 ` [PATCH v11 5/8] mm: move pgoff_address() to vma_pgoff_address() Shiyang Ruan
2022-03-30 5:46 ` Christoph Hellwig
2022-03-30 6:49 ` Shiyang Ruan
2022-02-27 12:07 ` [PATCH v11 6/8] mm: Introduce mf_dax_kill_procs() for fsdax case Shiyang Ruan
2022-03-30 5:51 ` Christoph Hellwig
2022-02-27 12:07 ` [PATCH v11 7/8] xfs: Implement ->notify_failure() for XFS Shiyang Ruan
2022-02-27 14:05 ` kernel test robot
2022-02-27 15:36 ` kernel test robot
2022-02-27 15:46 ` kernel test robot
2022-03-30 6:00 ` Christoph Hellwig
2022-03-30 15:16 ` Shiyang Ruan
2022-03-30 15:52 ` Christoph Hellwig
2022-04-08 6:04 ` Shiyang Ruan
2022-04-08 6:26 ` Dan Williams
2022-04-08 6:25 ` Dan Williams
2022-02-27 12:07 ` [PATCH v11 8/8] fsdax: set a CoW flag when associate reflink mappings Shiyang Ruan
2022-02-27 15:57 ` kernel test robot
2022-03-10 13:08 ` [PATCH v11 0/8] fsdax: introduce fs query to support reflink Shiyang Ruan
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