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Re: interesting MD-xfs bug

To: Joe Landman <joe.landman@xxxxxxxxx>
Subject: Re: interesting MD-xfs bug
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Fri, 10 Apr 2015 08:53:22 +1000
Cc: xfs <xfs@xxxxxxxxxxx>, linux-raid <linux-raid@xxxxxxxxxxxxxxx>
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <5526FB2A.8060704@xxxxxxxxx>
References: <5526E8E9.3030805@xxxxxxxxx> <20150409221846.GG13731@dastard> <5526FB2A.8060704@xxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Thu, Apr 09, 2015 at 06:20:26PM -0400, Joe Landman wrote:
> On 04/09/2015 06:18 PM, Dave Chinner wrote:
> >On Thu, Apr 09, 2015 at 05:02:33PM -0400, Joe Landman wrote:
> >>If I build an MD raid0 with a non power of 2 chunk size, it appears
> >>that I can mkfs.xfs a file system, but it doesn't show up in blkid
> >>and is not mountable.  Yet, using a power of 2 chunk size, this does
> >>work correctly.   This is kernel 3.18.9.
> >>
> [...]
> >That looks more like a blkid or udev problem. try using blkid -p so
> >that it doesn't look up the cache but directly probes devices for
> >the signatures. strace might tell you a bit more, too. And if the
> >filesystem mounts, then it definitely isn't an XFS problem ;)
> Thats the thing, it didn't mount, even when I used the device name
> directly.

Ok, that's interesting. Let me see if I can reproduce it locally. If
you don't hear otherwise, tracing would still be useful. Thanks for
the bug report, Joe.


Dave Chinner

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