linux-kernel - Re: NILFS2: double uuid

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Date:	Tue, 9 Jun 2015 16:07:42 +0200
From:	Karel Zak <kzak@...hat.com>
To:	Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>
Cc:	Heinz Diehl <htd+ml@...tha.org>, linux-kernel@...r.kernel.org,
	linux-nilfs@...r.kernel.org
Subject: Re: NILFS2: double uuid

On Tue, Jun 09, 2015 at 10:04:15PM +0900, Ryusuke Konishi wrote:
> $ sudo nilfs-resize -y /dev/sdb1 1G
> Partition size = 2146435072 bytes.
> Shrink the filesystem size from 2146435072 bytes to 1073741824 bytes.
> 128 segments will be truncated from segnum 127.
> Moving 103 in-use segments.
> progress |***********************************************|
> Done.
> 
> $ sudo umount /test
> $ sudo mount /dev/sdb1 /test
> $ sudo LD_LIBRARY_PATH=/usr/local/lib lsblk -f
> NAME   FSTYPE  LABEL           UUID MOUNTPOINT
> [...]
> sdb
> `-sdb1                                                              /test
> 
> This blank state continued until I shrank the partition or
> re-extended the filesystem to the partition size.
> 
> Could you consider confining the s_dev_size test only to the
> backup superblock ?

Hmm... why nilfs-resize does not update the size in the superblock?
It seems like nilfs-resize bug.

> It seems that we don't have to drop the primary super block
> even if s_dev_size doesn't fit to the partition size.

Yes, fixed. I have also enabled the s_dev_size check for whole-disk
devices only to minimize number of situations when we rely on the
s_dev_size.

    Karel

-- 
 Karel Zak  <kzak@...hat.com>
 http://karelzak.blogspot.com
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