linux-kernel - Re: [PATCH v10 5/9] fsdax: Introduce dax_load

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Message-ID: <CAPcyv4jWuWWWBAEesMorK+LL6GVyqf-=VSChdw6P8txtckC=aw@mail.gmail.com>
Date:   Tue, 15 Feb 2022 17:34:12 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     Shiyang Ruan <ruansy.fnst@...itsu.com>
Cc:     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>,
        Christoph Hellwig <hch@...radead.org>,
        Jane Chu <jane.chu@...cle.com>, Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v10 5/9] fsdax: Introduce dax_load_page()

On Thu, Jan 27, 2022 at 4:41 AM Shiyang Ruan <ruansy.fnst@...itsu.com> 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()?