Re: [PATCH 12/18] shared mount handling: bind and rbind

[Miklos Szeredi <miklos@szeredi.hu>]

> Before it gets freed it may end up being copied.  Example: vfsmounts
> A and B are peers, C is a slave of that peer group.  It happens to be
> on slave list of B.  B has root deeper than A, which, in turn is deeper
> than that of C (e.g. A and B had been created by binding subtrees of
> C, which had been made slave afterwards).  We bind on something in A,
> outside of the subtree mapped by B.
> 
> Alternatively, have A -> (B, D) -> C, with C on slave list of B.  Mountpoint
> is within subtrees for A, C and D, but not B.  And no, we can't say "skip B,
> just make a slave of tree on A and slap it on C" - correct result is to
> have T_A -> T_D -> T_C (i.e. tree on C gets propagation from tree on D).
> Which kills the variants with not creating that copy and making subsequent
> ones directly from the original tree.

OK, I see it now.  What confused me is that from patch 12 it's not yet
obvious, that the copied mount will be used for futher propagation.

Miklos
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