[dm-devel] [PATCH v7 4/6] dax: add DAX_RECOVERY flag and .recovery_write dev_pgmap_ops

[Christoph Hellwig]

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.