linux-ext4 - Re: [PATCH 4/5] dax: use sb_issue_zerout instead of calling dax_clear

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Date:	Fri, 25 Mar 2016 21:01:15 +0000
From:	"Verma, Vishal L" <vishal.l.verma@...el.com>
To:	"hch@...radead.org" <hch@...radead.org>
CC:	"linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
	"xfs@....sgi.com" <xfs@....sgi.com>,
	"linux-nvdimm@...1.01.org" <linux-nvdimm@...1.01.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
	"Williams, Dan J" <dan.j.williams@...el.com>,
	"axboe@...com" <axboe@...com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"ross.zwisler@...ux.intel.com" <ross.zwisler@...ux.intel.com>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	"Wilcox, Matthew R" <matthew.r.wilcox@...el.com>,
	"david@...morbit.com" <david@...morbit.com>,
	"jack@...e.cz" <jack@...e.cz>
Subject: Re: [PATCH 4/5] dax: use sb_issue_zerout instead of calling
 dax_clear_sectors

On Fri, 2016-03-25 at 03:44 -0700, Christoph Hellwig wrote:
> On Thu, Mar 24, 2016 at 05:17:29PM -0600, Vishal Verma wrote:
> > 
> > @@ -72,16 +72,7 @@ xfs_zero_extent(
> >  	struct xfs_mount *mp = ip->i_mount;
> >  	xfs_daddr_t	sector = xfs_fsb_to_db(ip, start_fsb);
> >  	sector_t	block = XFS_BB_TO_FSBT(mp, sector);
> > -	ssize_t		size = XFS_FSB_TO_B(mp, count_fsb);
> >  
> > -	if (IS_DAX(VFS_I(ip)))
> > -		return
> > dax_clear_sectors(xfs_find_bdev_for_inode(VFS_I(ip)),
> > -				sector, size);
> > -
> > -	/*
> > -	 * let the block layer decide on the fastest method of
> > -	 * implementing the zeroing.
> > -	 */
> >  	return sb_issue_zeroout(mp->m_super, block, count_fsb,
> > GFP_NOFS);
> While not new: using sb_issue_zeroout in XFS is wrong as it doesn't
> account for the RT device.  We need the xfs_find_bdev_for_inode and
> call blkdev_issue_zeroout directly with the bdev it returned.

Ok, I'll fix and send a v2. Thanks!
>