[Pacemaker] heartbeat/nfsserver: is_bound function no longer works with current linux kernel

[Dejan Muhamedagic]

Hi,

On Thu, Feb 09, 2012 at 01:41:33PM +0100, Eberhard Kuemmerle wrote:
> Hi,
>
> my nfsserver resource is configured like that:
>
> primitive nfs ocf:heartbeat:nfsserver \
>         params nfs_shared_infodir="/server/nfs_infodir"
>
> With older kernels, the bind mount produced by ocf:heartbeat:nfsserver
> and the mount of the base filesystem looked like that in /etc/mtab:
>
> /dev/mapper/server on /server type ext4
> (rw,relatime,user_xattr,acl,barrier=1,data=ordered)
> /server/nfs_infodir on /var/lib/nfs type none ...
>
> and the is_bound function in ocf:heartbeat:nfsserver worked fine.
> But with newer kernels (now I use Opensuse 12.1, kernel 3.1.9) the
> mounts look like that:
>
> /dev/mapper/server on /server type ext4
> (rw,relatime,user_xattr,acl,barrier=1,data=ordered)
> /dev/mapper/server on /var/lib/nfs type ext4
> (rw,relatime,user_xattr,acl,barrier=1,data=ordered)
>
> and the is_bound function cannot identify it's mount.

So, the mount format changed. Is that caused by the new kernel
version or the new version of the mount command?

> More information can be found in /proc/self/mountinfo:
>
>  /    /server rw,relatime - ext4 /dev/mapper/server
> rw,user_xattr,acl,barrier=1,data=ordered
>  /nfs_infodir    /var/lib/nfs rw,relatime - ext4 /dev/mapper/server
> rw,user_xattr,acl,barrier=1,data=ordered
>
> Here, it is visible that only the subdirectory nfs_infodir is mounted on
> /var/lib/nfs.
> Perhaps, that information should be used in is_bound.

Yes, looks like that should be safe to do.

Anybody with a patch?

Cheers,

Dejan

P.S. Moving the discussion to linux-ha-dev.

> Regards,
>   Eberhard
>
>
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