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.