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Re: [PATCH] xfstests: Ensure cmdline geometry puts mkfs.xfs into multidi

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: [PATCH] xfstests: Ensure cmdline geometry puts mkfs.xfs into multidisk mode
From: Eric Sandeen <sandeen@xxxxxxxxxxx>
Date: Sun, 09 Dec 2012 18:23:21 -0600
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>, Ben England <bengland@xxxxxxxxxx>, xfs-oss <xfs@xxxxxxxxxxx>
In-reply-to: <20121209235105.GD15784@dastard>
References: <50ABB115.9070905@xxxxxxxxxxx> <20121121095636.GC23339@xxxxxxxxxxxxx> <50C115E8.9090106@xxxxxxxxxxx> <20121208120007.GB4430@xxxxxxxxxxxxx> <50C36A83.1040406@xxxxxxxxxxx> <20121209235105.GD15784@dastard>
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On 12/9/12 5:51 PM, Dave Chinner wrote:
> On Sat, Dec 08, 2012 at 10:27:47AM -0600, Eric Sandeen wrote:
>> On 12/8/12 6:00 AM, Christoph Hellwig wrote:
>>> On Thu, Dec 06, 2012 at 04:02:16PM -0600, Eric Sandeen wrote:
>>>> Ensure that when mkfs.xfs is invoked with commandline geometry, it
>>>> triggers multidisk mode and creates more AGs.
>>>>
>>>> Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
>>>
>>> Looks good,
>>>
>>> Reviewed-by: Christoph Hellwig <hch@xxxxxx>
>>
>> Thanks
>>
>>>> Maybe this should also test device-specified geometry, but not sure
>>>> how to do that easily within xfstests, any ideas?
>>>
>>> That would involved scsi_debug so that we could set them up.  We had
>>> several ideas how to use scsi debug for these sort of tests but never
>>> really bothered to do it.  If you have some spare cycles I'd love to see
>>> this sort of tests.
>>
>> scsi_debug won't report geometry on its own today; we'd need to assemble
>> something out of scsi_debug luns I'm afraid, so it gets even more involved.
>>
>> We do have a little bit of scsi_debug framework in xfstests today, though,
>> so if scsi_debug grew the capability it'd be easy to add.
> 
> Does it really need scsi for this? To mkfs.xfs, all devices look the
> same, so if you want to make random geometries, wouldn't playing
> games with llopback devices and DM be sufficient?

Yeah that'd be fine too.  If scsi_debug could just generate geometries
that'd be a bit easier.  But it doesn't.

-Eric

> Cheers,
> 
> Dave.
> 

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