linux-ext4 - Re: [PATCH v5 3/5] dax: use sb_issue_zerout instead of calling dax_clear

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Date:	Sun, 8 May 2016 01:52:03 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Vishal Verma <vishal.l.verma@...el.com>
Cc:	linux-nvdimm@...1.01.org,
	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
	xfs@....sgi.com, linux-ext4@...r.kernel.org, linux-mm@...ck.org,
	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Dave Chinner <david@...morbit.com>, Jan Kara <jack@...e.cz>,
	Jens Axboe <axboe@...com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	Jeff Moyer <jmoyer@...hat.com>,
	Boaz Harrosh <boaz@...xistor.com>
Subject: Re: [PATCH v5 3/5] dax: use sb_issue_zerout instead of calling
 dax_clear_sectors

On Fri, May 06, 2016 at 03:53:09PM -0600, Vishal Verma wrote:
> From: Matthew Wilcox <matthew.r.wilcox@...el.com>
> 
> dax_clear_sectors() cannot handle poisoned blocks.  These must be
> zeroed using the BIO interface instead.  Convert ext2 and XFS to use
> only sb_issue_zerout().
> 
> Signed-off-by: Matthew Wilcox <matthew.r.wilcox@...el.com>
> [vishal: Also remove the dax_clear_sectors function entirely]
> Signed-off-by: Vishal Verma <vishal.l.verma@...el.com>

Just to make sure:  the existing sb_issue_zerout as in 4.6-rc
is already doing the right thing for DAX?  I've got a pending patchset
for XFS that introduces another dax_clear_sectors users, but if it's
already safe to use blkdev_issue_zeroout I can switch to that and avoid
the merge conflict.
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