linux-ext4 - Re: [PATCH 4/4] e2fsck: regression tests for INCOMPAT

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Date:	Sat, 24 Sep 2011 14:51:55 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Andreas Dilger <adilger@...mcloud.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 4/4] e2fsck: regression tests for INCOMPAT_MMP feature

On Fri, Sep 23, 2011 at 05:38:44PM -0600, Andreas Dilger wrote:
> Add tests for the MMP feature - creating a filesystem with mke2fs
> and MMP enabled, enable/disable MMP with tune2fs, disabling the
> e2fsck MMP flag with tune2fs after a failed e2fsck, and e2fsck
> checking and fixing a corrupt MMP block.
> 
> The MMP tests need to be run from a real disk, not tmpfs, because
> tmpfs doesn't support O_DIRECT reads, which MMP uses to ensure
> that reads from the MMP block are not filled from the page cache.
> Using a local disk does not slow down the tests noticably, since
> they wait to detect if the MMP block is being modified.
> 
> Signed-off-by: Andreas Dilger <adilger@...mcloud.com>

Applied, although I needed to refrob the test names.  The first
character denotes not the test is for:

*) f_* tests are for e2fsck
*) m_* tests are for tune2fs
*) u_* tests are for e2undofs

This allows someone to test mke2fs by running the command:

	(cd tests; ./test_script m)

						- Ted
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