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

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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
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