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Date:   Thu, 9 May 2019 08:24:24 -0400 (EDT)
From:   Pankaj Gupta <pagupta@redhat.com>
To:     Dan Williams <dan.j.williams@intel.com>
Cc:     linux-nvdimm <linux-nvdimm@lists.01.org>,
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References: <20190426050039.17460-1-pagupta@redhat.com> <20190426050039.17460-4-pagupta@redhat.com> <CAPcyv4hRdvypEj4LBTMfUFm80BdpRYbOugrkkj-3Kk_LErXPqQ@mail.gmail.com>
Subject: Re: [PATCH v7 3/6] libnvdimm: add dax_dev sync flag
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> >
> > This patch adds 'DAXDEV_SYNC' flag which is set
> > for nd_region doing synchronous flush. This later
> > is used to disable MAP_SYNC functionality for
> > ext4 & xfs filesystem for devices don't support
> > synchronous flush.
> >
> > Signed-off-by: Pankaj Gupta <pagupta@redhat.com>
> [..]
> > diff --git a/include/linux/dax.h b/include/linux/dax.h
> > index 0dd316a74a29..c97fc0cc7167 100644
> > --- a/include/linux/dax.h
> > +++ b/include/linux/dax.h
> > @@ -7,6 +7,9 @@
> >  #include <linux/radix-tree.h>
> >  #include <asm/pgtable.h>
> >
> > +/* Flag for synchronous flush */
> > +#define DAXDEV_F_SYNC true
> 
> I'd feel better, i.e. it reads more canonically, if this was defined
> as (1UL << 0) and the argument to alloc_dax() was changed to 'unsigned
> long flags' rather than a bool.

Sure, Will send a v8 with suggested changes.

Thank You,
Pankaj

>