[systemd-devel] [opensuse-kernel] New mount restriction?

[Andrey Borzenkov]

В Mon, 08 Apr 2013 11:37:14 -0400
Jeff Mahoney <jeffm at suse.com> пишет:

> On 4/8/13 8:49 AM, Tetsuo Handa wrote:
> > Hello.
> > 
> > It seems to me that "mount --move /tmp/old/ /tmp/new/" is not working
> > on opensuse 12.3 kernel.
> > 
> > linux:~ # uname -r
> > 3.7.10-1.1-desktop
> > linux:~ # mkdir -p /tmp/old/ /tmp/new/
> > linux:~ # mount -t tmpfs none /tmp/old/
> > linux:~ # mount --move /tmp/old/ /tmp/new/
> > mount: wrong fs type, bad option, bad superblock on /tmp/old,
> >        missing codepage or helper program, or other error
> >        In some cases useful info is found in syslog - try
> >        dmesg | tail or so
> > 
> > strace says
> > 
> >   mount("/tmp/old", "/tmp/new", 0xb7c34168, MS_MGC_VAL|MS_MOVE, NULL) = -1 EINVAL (Invalid argument)
> > 
> > Is this a bug (or is this caused by yama-like restriction mechanism)?
> 
> Do you know the last kernel where this worked as you expect? I've tested
> vanilla kernels from 3.0 to 3.9-rc4 and it behaves as you describe in
> your test.
> 

This seems to be yest another fallout of changed systemd policy - it
now makes / shared mount.

bor at opensuse:~> sudo mount --move /tmp/old /tmp/new
mount: wrong fs type, bad option, bad superblock on /tmp/old,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail or so
bor at opensuse:~> sudo mount --make-private /
bor at opensuse:~> sudo mount --move /tmp/old /tmp/new
bor at opensuse:~> cd
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