linux-nvdimm.lists.01.org archive mirror
 help / color / mirror / Atom feed
From: "ruansy.fnst@fujitsu.com" <ruansy.fnst@fujitsu.com>
To: Matthew Wilcox <willy@infradead.org>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-xfs@vger.kernel.org" <linux-xfs@vger.kernel.org>,
	"linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>,
	"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
	"darrick.wong@oracle.com" <darrick.wong@oracle.com>,
	"jack@suse.cz" <jack@suse.cz>,
	"viro@zeniv.linux.org.uk" <viro@zeniv.linux.org.uk>,
	"linux-btrfs@vger.kernel.org" <linux-btrfs@vger.kernel.org>,
	"david@fromorbit.com" <david@fromorbit.com>,
	"hch@lst.de" <hch@lst.de>, "rgoldwyn@suse.de" <rgoldwyn@suse.de>,
	Ritesh Harjani <riteshh@gmail.com>
Subject: RE: [PATCH 1/3] fsdax: Factor helpers to simplify dax fault code
Date: Wed, 7 Apr 2021 12:29:13 +0000	[thread overview]
Message-ID: <OSAPR01MB2913CC6A36BFBBCDCFBE2B9BF4759@OSAPR01MB2913.jpnprd01.prod.outlook.com> (raw)
In-Reply-To: <20210407111355.GD2531743@casper.infradead.org>



> -----Original Message-----
> From: Matthew Wilcox <willy@infradead.org>
> Sent: Wednesday, April 7, 2021 7:14 PM
> To: Ruan, Shiyang/阮 世阳 <ruansy.fnst@fujitsu.com>
> Cc: linux-kernel@vger.kernel.org; linux-xfs@vger.kernel.org;
> linux-nvdimm@lists.01.org; linux-fsdevel@vger.kernel.org;
> darrick.wong@oracle.com; dan.j.williams@intel.com; jack@suse.cz;
> viro@zeniv.linux.org.uk; linux-btrfs@vger.kernel.org; david@fromorbit.com;
> hch@lst.de; rgoldwyn@suse.de; Ritesh Harjani <riteshh@gmail.com>
> Subject: Re: [PATCH 1/3] fsdax: Factor helpers to simplify dax fault code
> 
> On Wed, Apr 07, 2021 at 02:32:05PM +0800, Shiyang Ruan wrote:
> > +static int dax_fault_cow_page(struct vm_fault *vmf, struct iomap *iomap,
> > +		loff_t pos, vm_fault_t *ret)
> > +{
> > +	int error = 0;
> > +	unsigned long vaddr = vmf->address;
> > +	sector_t sector = dax_iomap_sector(iomap, pos);
> > +
> > +	switch (iomap->type) {
> > +	case IOMAP_HOLE:
> > +	case IOMAP_UNWRITTEN:
> > +		clear_user_highpage(vmf->cow_page, vaddr);
> > +		break;
> > +	case IOMAP_MAPPED:
> > +		error = copy_cow_page_dax(iomap->bdev, iomap->dax_dev,
> > +						sector, vmf->cow_page, vaddr);
> > +		break;
> > +	default:
> > +		WARN_ON_ONCE(1);
> > +		error = -EIO;
> > +		break;
> > +	}
> > +
> > +	if (error)
> > +		return error;
> > +
> > +	__SetPageUptodate(vmf->cow_page);
> > +	*ret = finish_fault(vmf);
> > +	if (!*ret)
> > +		*ret = VM_FAULT_DONE_COW;
> > +	return 0;
> > +}
> ...
> 
> > +		error = dax_fault_cow_page(vmf, &iomap, pos, &ret);
> >  		if (error)
> > +			ret = dax_fault_return(error);
> >  		goto finish_iomap;
> 
> This seems unnecessarily complex.  Why not return the vm_fault_t instead of
> returning the errno and then converting it?

Yes, I'll fix it.


--
Thanks,
Ruan Shiyang.
_______________________________________________
Linux-nvdimm mailing list -- linux-nvdimm@lists.01.org
To unsubscribe send an email to linux-nvdimm-leave@lists.01.org

  reply	other threads:[~2021-04-07 12:29 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-07  6:32 [PATCH 0/3] fsdax: Factor helper functions to simplify the code Shiyang Ruan
2021-04-07  6:32 ` [PATCH 1/3] fsdax: Factor helpers to simplify dax fault code Shiyang Ruan
2021-04-07 10:14   ` riteshh
2021-04-07 11:13   ` Matthew Wilcox
2021-04-07 12:29     ` ruansy.fnst [this message]
2021-04-07  6:32 ` [PATCH 2/3] fsdax: Factor helper: dax_fault_actor() Shiyang Ruan
2021-04-07 10:21   ` riteshh
2021-04-07  6:32 ` [PATCH 3/3] fsdax: Output address in dax_iomap_pfn() and rename it Shiyang Ruan
2021-04-07 10:16   ` riteshh

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=OSAPR01MB2913CC6A36BFBBCDCFBE2B9BF4759@OSAPR01MB2913.jpnprd01.prod.outlook.com \
    --to=ruansy.fnst@fujitsu.com \
    --cc=darrick.wong@oracle.com \
    --cc=david@fromorbit.com \
    --cc=hch@lst.de \
    --cc=jack@suse.cz \
    --cc=linux-btrfs@vger.kernel.org \
    --cc=linux-fsdevel@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-nvdimm@lists.01.org \
    --cc=linux-xfs@vger.kernel.org \
    --cc=rgoldwyn@suse.de \
    --cc=riteshh@gmail.com \
    --cc=viro@zeniv.linux.org.uk \
    --cc=willy@infradead.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).