linux-ext4 - Re: [PATCH 05/18] ext2: Avoid DAX zeroing to corrupt data

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Message-ID: <20160429163048.GA5888@linux.intel.com>
Date:	Fri, 29 Apr 2016 10:30:48 -0600
From:	Ross Zwisler <ross.zwisler@...ux.intel.com>
To:	Jan Kara <jack@...e.cz>
Cc:	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
	linux-mm@...ck.org, Ross Zwisler <ross.zwisler@...ux.intel.com>,
	Dan Williams <dan.j.williams@...el.com>,
	linux-nvdimm@...ts.01.org, Matthew Wilcox <willy@...ux.intel.com>
Subject: Re: [PATCH 05/18] ext2: Avoid DAX zeroing to corrupt data

On Mon, Apr 18, 2016 at 11:35:28PM +0200, Jan Kara wrote:
> Currently ext2 zeroes any data blocks allocated for DAX inode however it
> still returns them as BH_New. Thus DAX code zeroes them again in
> dax_insert_mapping() which can possibly overwrite the data that has been
> already stored to those blocks by a racing dax_io(). Avoid marking
> pre-zeroed buffers as new.
> 
> Signed-off-by: Jan Kara <jack@...e.cz>

Reviewed-by: Ross Zwisler <ross.zwisler@...ux.intel.com>
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