linux-ext4 - Re: [PATCH 14/29] fsdax: simplify the pgoff calculation

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Date:   Wed, 24 Nov 2021 07:39:34 +0100
From:   Christoph Hellwig <hch@....de>
To:     "Darrick J. Wong" <djwong@...nel.org>
Cc:     Christoph Hellwig <hch@....de>,
        Dan Williams <dan.j.williams@...el.com>,
        Mike Snitzer <snitzer@...hat.com>,
        Ira Weiny <ira.weiny@...el.com>, dm-devel@...hat.com,
        linux-xfs@...r.kernel.org, nvdimm@...ts.linux.dev,
        linux-s390@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-erofs@...ts.ozlabs.org, linux-ext4@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH 14/29] fsdax: simplify the pgoff calculation

On Tue, Nov 23, 2021 at 02:36:42PM -0800, Darrick J. Wong wrote:
> > -	phys_addr_t phys_off = (start_sect + sector) * 512;
> > -
> > -	if (pgoff)
> > -		*pgoff = PHYS_PFN(phys_off);
> > -	if (phys_off % PAGE_SIZE || size % PAGE_SIZE)
> 
> AFAICT, we're relying on fs_dax_get_by_bdev to have validated this
> previously, which is why the error return stuff goes away?

Exactly.