From: Karel Zak <kzak@redhat.com>
To: "Lukáš Czerner" <lczerner@redhat.com>
Cc: Dave Chinner <david@fromorbit.com>,
xfs@oss.sgi.com, sandeen@redhat.com,
Zach Brown <zabrown@redhat.com>,
linux-btrfs@vger.kernel.org
Subject: Re: [PATCH] xfs_mkfs: wipe old signatures from the device
Date: Wed, 13 Feb 2013 13:16:55 +0100 [thread overview]
Message-ID: <20130213121655.GA7799@x2.net.home> (raw)
In-Reply-To: <alpine.LFD.2.00.1302131127070.2315@(none)>
On Wed, Feb 13, 2013 at 11:41:08AM +0100, Lukáš Czerner wrote:
> However
>
> mkfs.btrfs /dev/sda
> mkfs.ext4 -F /dev/sda
>
> works well, however I am not sure why that is. Is that some kind of
> mount(8) magic ?
This is bug in libmount. Fixed in upstream tree. The libmount in some
cases ignores the ambivalent probing result from libblkid and tries
stuff from /etc/filesystems (where is for example ext4).
> So I think that liblkid _and_ btrfs tools has to be fixed not to treat
> backup superblocks as primary!
The problem with additional btrfs superblocks has been already reported
to btrfs guys:
http://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg20957.html
and I don't see a reply "yep, this is btrfs-progs bug" :-)
Karel
--
Karel Zak <kzak@redhat.com>
http://karelzak.blogspot.com
WARNING: multiple messages have this Message-ID (diff)
From: Karel Zak <kzak@redhat.com>
To: "Lukáš Czerner" <lczerner@redhat.com>
Cc: Zach Brown <zabrown@redhat.com>,
sandeen@redhat.com, linux-btrfs@vger.kernel.org, xfs@oss.sgi.com
Subject: Re: [PATCH] xfs_mkfs: wipe old signatures from the device
Date: Wed, 13 Feb 2013 13:16:55 +0100 [thread overview]
Message-ID: <20130213121655.GA7799@x2.net.home> (raw)
In-Reply-To: <alpine.LFD.2.00.1302131127070.2315@(none)>
On Wed, Feb 13, 2013 at 11:41:08AM +0100, Lukáš Czerner wrote:
> However
>
> mkfs.btrfs /dev/sda
> mkfs.ext4 -F /dev/sda
>
> works well, however I am not sure why that is. Is that some kind of
> mount(8) magic ?
This is bug in libmount. Fixed in upstream tree. The libmount in some
cases ignores the ambivalent probing result from libblkid and tries
stuff from /etc/filesystems (where is for example ext4).
> So I think that liblkid _and_ btrfs tools has to be fixed not to treat
> backup superblocks as primary!
The problem with additional btrfs superblocks has been already reported
to btrfs guys:
http://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg20957.html
and I don't see a reply "yep, this is btrfs-progs bug" :-)
Karel
--
Karel Zak <kzak@redhat.com>
http://karelzak.blogspot.com
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next prev parent reply other threads:[~2013-02-13 12:16 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-12 11:06 [PATCH] xfs_mkfs: wipe old signatures from the device Lukas Czerner
2013-02-12 11:31 ` Karel Zak
2013-02-12 11:58 ` Lukáš Czerner
2013-02-12 20:27 ` Dave Chinner
2013-02-13 8:01 ` Karel Zak
2013-02-13 10:41 ` Lukáš Czerner
2013-02-13 12:16 ` Karel Zak [this message]
2013-02-13 12:16 ` Karel Zak
2013-02-13 22:17 ` Dave Chinner
2013-02-13 22:17 ` Dave Chinner
2013-02-14 7:29 ` Chris Murphy
2013-02-14 7:29 ` Chris Murphy
2013-02-14 8:36 ` Lukáš Czerner
2013-02-14 11:04 ` Dave Chinner
2013-02-14 11:04 ` Dave Chinner
2013-02-14 12:28 ` Lukáš Czerner
2013-02-14 14:48 ` Martin Steigerwald
2013-02-14 14:48 ` Martin Steigerwald
2013-02-14 18:35 ` Eric Sandeen
2013-02-14 18:35 ` Eric Sandeen
2013-02-14 14:54 ` Hugo Mills
2013-02-14 14:54 ` Hugo Mills
2013-02-14 17:25 ` Eric Sandeen
2013-02-14 17:25 ` Eric Sandeen
2013-02-14 19:08 ` Chris Murphy
2013-02-14 11:45 ` Dave Howorth
2013-02-14 19:17 ` Eric Sandeen
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