Re: [PATCH v10 5/9] fsdax: Introduce dax_load_page()

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To: Dan Williams <dan.j.williams@xxxxxxxxx>
Subject: Re: [PATCH v10 5/9] fsdax: Introduce dax_load_page()
From: Shiyang Ruan <ruansy.fnst@xxxxxxxxxxx>
Date: Wed, 16 Feb 2022 11:02:26 +0800
Cc: Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, linux-xfs <linux-xfs@xxxxxxxxxxxxxxx>, Linux NVDIMM <nvdimm@xxxxxxxxxxxxxxx>, Linux MM <linux-mm@xxxxxxxxx>, linux-fsdevel <linux-fsdevel@xxxxxxxxxxxxxxx>, "Darrick J. Wong" <djwong@xxxxxxxxxx>, david <david@xxxxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Jane Chu <jane.chu@xxxxxxxxxx>, Christoph Hellwig <hch@xxxxxx>
In-reply-to: <CAPcyv4jWuWWWBAEesMorK+LL6GVyqf-=VSChdw6P8txtckC=aw@mail.gmail.com>
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在 2022/2/16 9:34, Dan Williams 写道:

On Thu, Jan 27, 2022 at 4:41 AM Shiyang Ruan <ruansy.fnst@xxxxxxxxxxx> wrote:


The current dax_lock_page() locks dax entry by obtaining mapping and
index in page.  To support 1-to-N RMAP in NVDIMM, we need a new function
to lock a specific dax entry


I do not see a call to dax_lock_entry() in this function, what keeps
this lookup valid after xas_unlock_irq()?

I am not sure if I understood your advice correctly: You saiddax_lock_entry() is not necessary in v9[1]. So, I deleted it.

[1]:https://lore.kernel.org/linux-xfs/CAPcyv4jVDfpHb1DCW+NLXH2YBgLghCVy8o6wrc02CXx4g-Bv7Q@xxxxxxxxxxxxxx/



--
Thanks,
Ruan.

Follow-Ups:
- Re: [PATCH v10 5/9] fsdax: Introduce dax_load_page()
  - From: Dan Williams

References:
- [PATCH v10 0/9] fsdax: introduce fs query to support reflink
  - From: Shiyang Ruan
- [PATCH v10 5/9] fsdax: Introduce dax_load_page()
  - From: Shiyang Ruan
- Re: [PATCH v10 5/9] fsdax: Introduce dax_load_page()
  - From: Dan Williams

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