linux-ext4 - Re: [PATCH 0/4 v2] mm,dax: Fix data corruption due to mmap inconsistency

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Message-ID: <20170508172707.GB18408@linux.intel.com>
Date:   Mon, 8 May 2017 11:27:07 -0600
From:   Ross Zwisler <ross.zwisler@...ux.intel.com>
To:     Jan Kara <jack@...e.cz>
Cc:     Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dan Williams <dan.j.williams@...el.com>,
        linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-nvdimm@...ts.01.org
Subject: Re: [PATCH 0/4 v2] mm,dax: Fix data corruption due to mmap
 inconsistency

On Fri, May 05, 2017 at 09:24:56AM +0200, Jan Kara wrote:
> Hello,
> 
> this series fixes data corruption that can happen for DAX mounts when
> page faults race with write(2) and as a result page tables get out of sync
> with block mappings in the filesystem and thus data seen through mmap is
> different from data seen through read(2).
> 
> The series passes testing with t_mmap_stale test program from Ross and also
> other mmap related tests on DAX filesystem. Ross, what you think?

I don't know if I have enough ext4-fu to properly review patch 3, but the rest
looks great (and that patch looks good to me as well, FWIW).  Thanks for
fixing this!