linux-kernel - Re: [PATCH v7 4/6] dax: add DAX_RECOVERY flag and .recovery_write dev_pgmap

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Message-ID: <YlUH2f66hMyXOP1r@infradead.org>
Date:   Mon, 11 Apr 2022 22:02:17 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Jane Chu <jane.chu@...cle.com>, david <david@...morbit.com>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Christoph Hellwig <hch@...radead.org>,
        Vishal L Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Alasdair Kergon <agk@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>,
        device-mapper development <dm-devel@...hat.com>,
        "Weiny, Ira" <ira.weiny@...el.com>,
        Matthew Wilcox <willy@...radead.org>,
        Vivek Goyal <vgoyal@...hat.com>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux NVDIMM <nvdimm@...ts.linux.dev>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-xfs <linux-xfs@...r.kernel.org>, X86 ML <x86@...nel.org>
Subject: Re: [PATCH v7 4/6] dax: add DAX_RECOVERY flag and .recovery_write
 dev_pgmap_ops

On Mon, Apr 11, 2022 at 09:57:36PM -0700, Dan Williams wrote:
> So how about change 'int flags' to 'enum dax_access_mode mode' where
> dax_access_mode is:
> 
> /**
>  * enum dax_access_mode - operational mode for dax_direct_access()
>  * @DAX_ACCESS: nominal access, fail / trim access on encountering poison
>  * @DAX_RECOVERY_WRITE: ignore poison and provide a pointer suitable
> for use with dax_recovery_write()
>  */
> enum dax_access_mode {
>     DAX_ACCESS,
>     DAX_RECOVERY_WRITE,
> };
> 
> Then the conversions look like this:
> 
>  -       rc = dax_direct_access(iter->iomap.dax_dev, pgoff, 1, &kaddr, NULL);
>  +       rc = dax_direct_access(iter->iomap.dax_dev, pgoff, 1,
> DAX_ACCESS, &kaddr, NULL);
> 
> ...and there's less chance of confusion with the @nr_pages argument.

Yes, this might be a little nicer.