linux-ext4 - Re: [PATCH 23/29] xfs: use IOMAP

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Message-ID: <CAPcyv4gVTAddA2cGFKgt5yJVTozxfQgstj3kicZAk2mZX+E1Og@mail.gmail.com>
Date:   Tue, 23 Nov 2021 18:49:06 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Mike Snitzer <snitzer@...hat.com>, Ira Weiny <ira.weiny@...el.com>,
        device-mapper development <dm-devel@...hat.com>,
        linux-xfs <linux-xfs@...r.kernel.org>,
        Linux NVDIMM <nvdimm@...ts.linux.dev>,
        linux-s390 <linux-s390@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        linux-erofs@...ts.ozlabs.org,
        linux-ext4 <linux-ext4@...r.kernel.org>,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH 23/29] xfs: use IOMAP_DAX to check for DAX mappings

On Tue, Nov 9, 2021 at 12:34 AM Christoph Hellwig <hch@....de> wrote:
>
> Use the explicit DAX flag instead of checking the inode flag in the
> iomap code.

It's not immediately clear to me why this is a net benefit, are you
anticipating inode-less operations? With reflink and multi-inode
operations a single iomap flag seems insufficient, no?