[CRIU] --ext-mount-map auto likes MS_BIND too much

[Andrew Vagin]

On Mon, Apr 20, 2015 at 06:49:00PM +0200, Oleg Nesterov wrote:
> On 04/15, Tycho Andersen wrote:
> >
> > Sorry, I meant to reply to that thread but forgot. It seems like it
> > would be nice to have the kernel at least expose the MNT_LOCK_* flags
> > somehow,
> 
> If you need this, perhaps you can just send a patch to lkml which adds
> the new entries into mnt_info[] in fs/proc_namespace.c:show_mnt_opts() ?

"just send a patch" does't work:)
http://comments.gmane.org/gmane.linux.file-systems/94457

> 
> > Otherwise, it feels like we've traded the user having to supply a
> > bunch of --ext-mount-map options for a bunch of --skip-mnt options.
> 
> Hmm... If I start mysqld under systemd it runs with unshared mnt ns and
> 
> 	$ grep systemd-private /proc/`pidof mysqld`/mountinfo
> 
> shows:
> 
> 	39 27 253:1 /tmp/systemd-private-oMYhXP/tmp /tmp rw,relatime shared:20 master:1 - xfs /dev/mapper/rhel_ibm--x3650m4--02--vm--02-root rw,seclabel,attr2,inode64,noquota
> 	40 27 253:1 /var/tmp/systemd-private-pQ1i03/tmp /var/tmp rw,relatime shared:21 master:1 - xfs /dev/mapper/rhel_ibm--x3650m4--02--vm--02-root rw,seclabel,attr2,inode64,noquota
> 
> how else can I use --ext-mount-map to dump restore these mounts?
> 
> Oleg.
>