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Description of problem:
mount --move doesn't work

Version-Release number of selected component (if applicable):

util-linux-2.22.1-2.4.el7.x86_64

Linux pes-guest-92.lab.eng.brq.redhat.com 3.7.0-0.32.el7.x86_64 #1 SMP Fri Jan 18 11:50:31 EST 2013 x86_64 x86_64 x86_64 GNU/Linux


How reproducible:
always

Steps to Reproduce:
1. mount xyz:/mnt/qa on /mnt/qa
2. mkdir /tmp/1234
3. mount --move /mnt/qa /tmp/1234
  
Actual results:
# mount -M /mnt/qa /tmp/tmp.fIC9T6y9lw
mount: wrong fs type, bad option, bad superblock on /mnt/qa,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail or so


Expected results:
mount is moved

Additional info:

Are you really sure that the used parents (mountpoints) are private? The current default in RHEL7 (not sure about RHEL6) is "shared", see /proc/self/mountinfo for the shared flag.

Linux kernel does not allow to move between shared targets.

Fedora 18:

# mount --bind /mnt/test /mnt/test
# mount --make-private /mnt/test
# mkdir /mnt/test/{foo,bar}

# mount /dev/sdb /mnt/test/foo

# findmnt /dev/sdb
TARGET        SOURCE   FSTYPE OPTIONS
/mnt/test/foo /dev/sdb ext2   rw,relatime,stripe=32

# mount --move /mnt/test/foo /mnt/test/bar

# findmnt /dev/sdb
TARGET        SOURCE   FSTYPE OPTIONS
/mnt/test/bar /dev/sdb ext2   rw,relatime,stripe=32

Fixed by upstream commit fcc0413a12efde3f413064a622ea0a0595ede49f (util-linux >= 2.23-rc2).

# mount --move /a /b
mount: bad option. Note that moving a mount residing under a shared
       mount is unsupported.

This request was resolved in Red Hat Enterprise Linux 7.0.

Contact your manager or support representative in case you have further questions about the request.