Re: umount and findmnt commands not working with btrfs labels ...

[George Mitchell <george@chinilu.com>]

On 05/07/2013 02:48 AM, Karel Zak wrote:
>   Hi George,
>
> On Mon, May 06, 2013 at 03:28:53PM -0700, George Mitchell wrote:
>> [root@localhost ghmitch]# umount LABEL=MAGEIA3BTR-BOOT
>>
>> umount: LABEL=MAGEIA3BTR-BOOT: not found
>   umount --version ?
>
>   It works for me (tested with util-linux 2.22 and 2.23):
>
>    # mkfs.btrfs -L MAGEIA3BTR /dev/sdb1
>    # mkfs.btrfs -L MAGEIA3BTR-FOO /dev/sdb2
>
>    # mount LABEL=MAGEIA3BTR /mnt/test
>    # mount LABEL=MAGEIA3BTR-FOO /mnt/test
>
>    # findmnt LABEL=MAGEIA3BTR
>    TARGET    SOURCE    FSTYPE OPTIONS
>    /mnt/test /dev/sdb1 btrfs  rw,relatime,ssd,space_cache
>
>    # findmnt LABEL=MAGEIA3BTR-FOO
>    TARGET     SOURCE    FSTYPE OPTIONS
>    /mnt/test2 /dev/sdb2 btrfs  rw,relatime,ssd,space_cache
>
>    # umount LABEL=MAGEIA3BTR
>    # umount LABEL=MAGEIA3BTR-FOO
>
>    # lsblk --fs /dev/sdb
>    NAME   FSTYPE LABEL          UUID                                 MOUNTPOINT
>    sdb
>    ├─sdb1 btrfs  MAGEIA3BTR     6dcc3293-ce27-474f-ab31-dd7a8e5bb2da
>    └─sdb2 btrfs  MAGEIA3BTR-FOO f3bb2d57-8b46-40a0-ae76-50d78268d6d9
>
>
> It would be nice to have a simple reproducible scenario rather than a
> lot of mount -l outputs and some egrep tricks :-)
>
> You can also try
>
>    LIBMOUNT_DEBUG=0xffff umount LABEL=MAGEIA3BTR-BOOT
>
> to see more details.
>
>      Karel
>
Thanks, and sorry for including all the garbage.  I just wanted to make 
sure I didn't leave anything out.  The version I have here is 2.22.2.  I 
retested it using the DEBUG statement and it then worked and findmnt now 
works OK as well, so I don't know what was going on.  Something seems to 
have gotten cleaned up somewhere.  Tonight I will retest it on my other 
system that I use for maintainance on the USR partition since it would 
probably be unwise to fiddle with the USR partition with the system 
running.  At that point I will repost letting you know what I find.  - 
George