linux-ext4 - Re: [PATCH] ext4/004: add dump/restore test

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Message-ID: <20141216035942.GE2152@dastard>
Date:	Tue, 16 Dec 2014 14:59:43 +1100
From:	Dave Chinner <david@...morbit.com>
To:	Theodore Ts'o <tytso@....edu>
Cc:	Xiaoguang Wang <wangxg.fnst@...fujitsu.com>,
	fstests@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [PATCH] ext4/004: add dump/restore test

On Mon, Dec 15, 2014 at 09:58:27PM -0500, Theodore Ts'o wrote:
> On Mon, Dec 08, 2014 at 09:44:48AM +0800, Xiaoguang Wang wrote:
> > 
> > Yeah, my intent is to test dump/restore program, and indeed I imitate that
> > how xfs to test xfsdump/xfsrestore, xfs puts xfsdump/xfsrestore tests in
> > corresponding xfs directory.
> 
> I'm finding that the test takes 6-7 minutes to run, partially because
> it's writing close to half a gigabyte worth of data for the
> dump/restore.  Is this really necessary?  Can we perhaps cut down the
> amount of data generated by running fsstress?

Yes, that is too long for an "auto" test. A couple of minutes is
about the limit we should be trying to stick to for auto tests; we
don't really add any extra coverage by making such tests run for a
long time.

As it is, most of the xfsdump/restore tests take around 30-60s to
run, so that's probably a good guide to follow for this.

> And I'll note that using the current fsstress arguments, you are only
> creating regular files and directories, and there are no symlinks,
> device nodes, or FIFO's being created to test whether those files are
> correctly being backed up and restored.

Probably a good idea, too. Thanks for looking at this, Ted.

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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