Re: NILFS2: double uuid

Karel Zak
2015-06-09T14:07:53Z

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@redhat.com>