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SubjectRe: [RFC][PATCH 0/3] vfs: Detach mounts on unlink.
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@redhat.com>
http://karelzak.blogspot.com


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