Re: mkfs devices ordering relevant with devices of different sizes?

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On Thu, Jul 26, 2012 at 03:09:59PM -0600, David Sterba wrote:
> On Wed, Jul 25, 2012 at 03:26:20PM +0200, Cyril B.  wrote:
> > When creating a filesystem with devices of different sizes, the resulting 
> > filesystem total size depends on the device order specified to mkfs. When 
> > the smaller device is specified first, the second (larger) device is seen as 
> > the same size as the first. This doesn't occur when the order is reversed.
> > 
> > It's confusing. Is this expected? I'm using the latest btrfs-progs and Linux 
> > 3.5.
> 
> Confusing it is, caused by this commit
> 
> Author:     Josef Bacik <josef@xxxxxxxxxx>
> AuthorDate: Wed Mar 28 14:20:52 2012 -0400
> Commit:     Chris Mason <chris.mason@xxxxxxxxxxxx>
> CommitDate: Tue Jul 3 16:27:46 2012 -0400
> 
>     btrfs-progs: enforce block count on all devices in mkfs
> 
>     I had a test that creates a 7gig raid1 device but it was ending up wonky
>     because the second device that gets added is the full size of the disk
>     instead of the limited size.  So enforce the limited size on all disks
>     passed in at mkfs time, otherwise our threshold calculations end up wonky
>     when doing chunk allocations.  Thanks,

Ooops, that's definitely not what I intended, I will fix that up right away,
sorry about that.  Thanks,

Josef
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