linux-ext4 - Re: [PATCH 4/4] generic: test locking when setting encryption policy

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Message-ID: <20161121192519.GE30672@google.com>
Date:   Mon, 21 Nov 2016 11:25:19 -0800
From:   Eric Biggers <ebiggers@...gle.com>
To:     Dave Chinner <david@...morbit.com>
Cc:     fstests@...r.kernel.org, linux-ext4@...r.kernel.org,
        "Theodore Y . Ts'o" <tytso@....edu>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        Richard Weinberger <richard@....at>,
        David Gstir <david@...ma-star.at>
Subject: Re: [PATCH 4/4] generic: test locking when setting encryption policy

On Mon, Nov 21, 2016 at 09:35:36AM +1100, Dave Chinner wrote:
> On Thu, Nov 17, 2016 at 11:47:07AM -0800, Eric Biggers wrote:
> > This test tries to reproduce (with a moderate chance of success on ext4)
> > a race condition where a file could be created in a directory
> > concurrently to an encryption policy being set on that directory,
> > causing the directory to become corrupted.
> 
> Why can't this be done with shell loops rather than requiring a
> helper application?
> 
> Cheers,
> 
> Dave.
> -- 
> Dave Chinner
> david@...morbit.com

That's what I tried originally, but the race was too difficult to hit with the
overhead of execing a program for every mkdir and ioctl syscall.

Eric
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