Re: [RFC][PATCH 0/3] vfs: Detach mounts on unlink.

[Karel Zak]

On Sat, Oct 05, 2013 at 06:42:44PM -0500, Rob Landley wrote:
> Oh, attached is a dumb "zapchroot" script I've been using for years to
> unlink all mount points under a given directory, taking advantage of the
> fact that mount points are appended to the end of the list so if you unlink
> from the end to the front you should get the sub-mounts before the parent
> mounts (modulo mount --move not reordering the list, but that's uncommon).

 util-linux umount supports --recursive, it uses /proc/self/mountinfo
 to compose the hierarchy. The important is that the mountinfo file
 contains Id and Parent_Id relations, so you don't rely on the order
 only.

> Recently I noticed some kernels where chroot does _not_ trim the paths so
> that the paths you see in /proc/mounts are relevant to the current chroot
> but instead have all sorts of crap you can't access with no way to know what
> it's talking about. That was sad, I need to go figure out if that was distro
> breakage or vanilla breakage...

 hmm..

    Karel


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