linux-kernel - Re: [Qemu-devel] [PATCH v4 5/5] xfs: disable map

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Date:   Thu, 4 Apr 2019 11:50:02 -0400 (EDT)
From:   Pankaj Gupta <pagupta@...hat.com>
To:     "Darrick J. Wong" <darrick.wong@...cle.com>
Cc:     Jan Kara <jack@...e.cz>, kvm@...r.kernel.org, mst@...hat.com,
        jasowang@...hat.com, Dave Chinner <david@...morbit.com>,
        qemu-devel@...gnu.org, virtualization@...ts.linux-foundation.org,
        adilger kernel <adilger.kernel@...ger.ca>, zwisler@...nel.org,
        aarcange@...hat.com, dave jiang <dave.jiang@...el.com>,
        linux-nvdimm@...ts.01.org,
        vishal l verma <vishal.l.verma@...el.com>, david@...hat.com,
        willy@...radead.org, hch@...radead.org, linux-acpi@...r.kernel.org,
        jmoyer@...hat.com, linux-ext4@...r.kernel.org, lenb@...nel.org,
        riel@...riel.com, stefanha@...hat.com,
        dan j williams <dan.j.williams@...el.com>,
        lcapitulino@...hat.com, kwolf@...hat.com, nilal@...hat.com,
        tytso@....edu, xiaoguangrong eric <xiaoguangrong.eric@...il.com>,
        cohuck@...hat.com, rjw@...ysocki.net, linux-kernel@...r.kernel.org,
        linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        imammedo@...hat.com
Subject: Re: [Qemu-devel] [PATCH v4 5/5] xfs: disable map_sync for async
 flush


> > > 
> > > So I would put the helper in include/linux/dax.h and have it like:
> > > 
> > > bool daxdev_mapping_supported(struct vm_area_struct *vma,
> 
> Should this be static inline if you're putting it in the header file?

yes. Thanks.

> 
> A comment ought to be added to describe what this predicate function
> does.

Sure, will add a comment describing the function.

> 
> > > 			      struct dax_device *dax_dev)
> > > {
> > > 	if (!(vma->vm_flags & VM_SYNC))
> > > 		return true;
> > > 	if (!IS_DAX(file_inode(vma->vm_file)))
> > > 		return false;
> > > 	return dax_synchronous(dax_dev);
> > > }
> > 
> > Sure. This is much better. I was also not sure what to name the helper
> > function.
> > I will go ahead with this unless 'Dave' & 'Darrick' have anything to add.
> 
> Jan's approach (modulo that one comment) looks good to me.

Sure. Thank you.

Best regards,
Pankaj

> 
> --D
>