[PATCH 4/5] dax: use sb_issue_zerout instead of calling dax_clear_sectors

[Verma, Vishal L]

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!
>