linux-kernel - Re: [PATCH v7 5/6] dax: for truncate/hole-punch, do zeroing through the driver if possible

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Message-ID: <20160512083852.GB10306@quack2.suse.cz>
Date:	Thu, 12 May 2016 10:38:52 +0200
From:	Jan Kara <jack@...e.cz>
To:	Vishal Verma <vishal.l.verma@...el.com>
Cc:	linux-nvdimm@...ts.01.org, 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 v7 5/6] dax: for truncate/hole-punch, do zeroing through
 the driver if possible

On Wed 11-05-16 15:08:51, Vishal Verma wrote:
> In the truncate or hole-punch path in dax, we clear out sub-page ranges.
> If these sub-page ranges are sector aligned and sized, we can do the
> zeroing through the driver instead so that error-clearing is handled
> automatically.
> 
> For sub-sector ranges, we still have to rely on clear_pmem and have the
> possibility of tripping over errors.
> 
> Cc: Dan Williams <dan.j.williams@...el.com>
> Cc: Ross Zwisler <ross.zwisler@...ux.intel.com>
> Cc: Jeff Moyer <jmoyer@...hat.com>
> Cc: Christoph Hellwig <hch@...radead.org>
> Cc: Dave Chinner <david@...morbit.com>
> Cc: Jan Kara <jack@...e.cz>
> Reviewed-by: Christoph Hellwig <hch@....de>
> Signed-off-by: Vishal Verma <vishal.l.verma@...el.com>

The patch looks good to me now. Feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR