Re: [RFC PATCH 6/9] iomap: use set/clear_fs_page_private

[Guoqing Jiang <guoqing.jiang@xxxxxxxxxxxxxxx>]

On 4/27/20 2:26 AM, Matthew Wilcox wrote:
> On Sun, Apr 26, 2020 at 11:49:22PM +0200, Guoqing Jiang wrote:
> > @@ -59,24 +59,18 @@ iomap_page_create(struct inode *inode, struct page *page)
> >   	 * migrate_page_move_mapping() assumes that pages with private data have
> >   	 * their count elevated by 1.
> >   	 */
> > -	get_page(page);
> > -	set_page_private(page, (unsigned long)iop);
> > -	SetPagePrivate(page);
> > -	return iop;
> > +	return (struct iomap_page *)set_fs_page_private(page, iop);
> >   }
> This cast is unnecessary.  void * will be automatically cast to the
> appropriate pointer type.
>
> > @@ -556,11 +550,9 @@ iomap_migrate_page(struct address_space *mapping, struct page *newpage,
> >   
> >   	if (page_has_private(page)) {
> >   		ClearPagePrivate(page);
> > -		get_page(newpage);
> > -		set_page_private(newpage, page_private(page));
> > +		set_fs_page_private(newpage, (void *)page_private(page));
> >   		set_page_private(page, 0);
> >   		put_page(page);
> > -		SetPagePrivate(newpage);
> >   	}
> Same comment here as for the btrfs migrate page that Dave reviewed.

Yes, thanks for the review.

Thanks,
Guoqing