Re: Mount -a and bind mounts. Bug?

[Karel Zak <kzak@redhat.com>]

On Fri, Dec 09, 2011 at 12:55:37PM +0000, Andrew Walrond wrote:
> On Fri, Dec 09, 2011 at 01:48:37PM +0100, Karel Zak wrote:
> >  - distro?
> 
> A custom job of my own
> 
> >  - linked with libmount?
> 
> Don't think so.
> 
> $ ldd /bin/mount
>         linux-vdso.so.1 =>  (0x00007fff093af000)
>         libblkid.so.1 => //lib/libblkid.so.1 (0x00007f087b755000)
>         libuuid.so.1 => //lib/libuuid.so.1 (0x00007f087b551000)
>         libc.so.6 => //lib/libc.so.6 (0x00007f087b1ca000)
>         /lib64/ld-linux-x86-64.so.2 => //lib64/ld-linux-x86-64.so.2 (0x00007f087b97b000)
> 
> Saw some mention of libmount somewhere when I upgraded and built 2.20.1 but didn't have time to read further.
> What's the current recommendation? Should I link against it?
> 
> >  - do you have regular mtab or symlink to /proc/mounts
> 
> symlink to /proc/mounts

 ... okay then it's expected behavior. The file /proc/mounts does not
 provide enough information about bind mounts. You need regular mtab
 or link with libmount (the library reads /proc/self/mountinfo and
 does some horrible voodoo to detect already mounted bind mounts).

    Karel

-- 
 Karel Zak  <kzak@redhat.com>
 http://karelzak.blogspot.com